[Intel-gfx] Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Intel-gfx] Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Christoph Hellwig]

This is my alternative take on this series from Jason:

https://lore.kernel.org/dri-devel/87czsszi9i.fsf@redhat.com/T/

The mdev/vfio parts are exactly the same, but this solves the driver core
changes for the direct probing without the in/out flag that Greg hated,
which cause a little more work, but probably make the result better.

Original decription from Jason below:

The mdev bus's core part for managing the lifecycle of devices is mostly
as one would expect for a driver core bus subsystem.

However instead of having a normal 'struct device_driver' and binding the
actual mdev drivers through the standard driver core mechanisms it open
codes this with the struct mdev_parent_ops and provides a single driver
that shims between the VFIO core's struct vfio_device and the actual
device driver.

Instead, allow mdev drivers implement an actual struct mdev_driver and
directly call vfio_register_group_dev() in the probe() function for the
mdev. Arrange to bind the created mdev_device to the mdev_driver that is
provided by the end driver.

The actual execution flow doesn't change much, eg what was
parent_ops->create is now device_driver->probe and it is called at almost
the exact same time - except under the normal control of the driver core.

Ultimately converting all the drivers unlocks a fair number of additional
VFIO simplifications and cleanups.
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Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Christoph Hellwig]

This is my alternative take on this series from Jason:

https://lore.kernel.org/dri-devel/87czsszi9i.fsf@redhat.com/T/

The mdev/vfio parts are exactly the same, but this solves the driver core
changes for the direct probing without the in/out flag that Greg hated,
which cause a little more work, but probably make the result better.

Original decription from Jason below:

The mdev bus's core part for managing the lifecycle of devices is mostly
as one would expect for a driver core bus subsystem.

However instead of having a normal 'struct device_driver' and binding the
actual mdev drivers through the standard driver core mechanisms it open
codes this with the struct mdev_parent_ops and provides a single driver
that shims between the VFIO core's struct vfio_device and the actual
device driver.

Instead, allow mdev drivers implement an actual struct mdev_driver and
directly call vfio_register_group_dev() in the probe() function for the
mdev. Arrange to bind the created mdev_device to the mdev_driver that is
provided by the end driver.

The actual execution flow doesn't change much, eg what was
parent_ops->create is now device_driver->probe and it is called at almost
the exact same time - except under the normal control of the driver core.

Ultimately converting all the drivers unlocks a fair number of additional
VFIO simplifications and cleanups.

[Intel-gfx] [PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

Checking if the dev is dead or if the dev is already bound is a required
precondition to invoking driver_probe_device(). All the call chains
leading here duplicate these checks.

Add it directly to driver_probe_device() so the precondition is clear and
remove the checks from device_driver_attach() and
__driver_attach_async_helper().

The other call chain going through __device_attach_driver() does have
these same checks but they are inlined into logic higher up the call stack
and can't be removed.

The sysfs uAPI call chain starting at bind_store() is a bit confused
because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
this to always return -EBUSY and always read dev->driver under its lock.

Done in preparation for the next patches which will add additional
callers to driver_probe_device() and will need these checks as well.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
[hch: drop the extra checks in device_driver_attach and bind_store]
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/bus.c |  2 +-
 drivers/base/dd.c  | 32 ++++++++++----------------------
 2 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 36d0c654ea61..7de13302e8c8 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -210,7 +210,7 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf,
 	int err = -ENODEV;
 
 	dev = bus_find_device_by_name(bus, NULL, buf);
-	if (dev && dev->driver == NULL && driver_match_device(drv, dev)) {
+	if (dev && driver_match_device(drv, dev)) {
 		err = device_driver_attach(drv, dev);
 
 		if (err > 0) {
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index ecd7cf848daf..7477d3322b3a 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -733,8 +733,9 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
  * @drv: driver to bind a device to
  * @dev: device to try to bind to the driver
  *
- * This function returns -ENODEV if the device is not registered,
- * 1 if the device is bound successfully and 0 otherwise.
+ * This function returns -ENODEV if the device is not registered, -EBUSY if it
+ * already has a driver, and 1 if the device is bound successfully and 0
+ * otherwise.
  *
  * This function must be called with @dev lock held.  When called for a
  * USB interface, @dev->parent lock must be held as well.
@@ -745,8 +746,10 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
 {
 	int ret = 0;
 
-	if (!device_is_registered(dev))
+	if (dev->p->dead || !device_is_registered(dev))
 		return -ENODEV;
+	if (dev->driver)
+		return -EBUSY;
 
 	dev->can_match = true;
 	pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
@@ -1027,17 +1030,10 @@ static void __device_driver_unlock(struct device *dev, struct device *parent)
  */
 int device_driver_attach(struct device_driver *drv, struct device *dev)
 {
-	int ret = 0;
+	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-
-	/*
-	 * If device has been removed or someone has already successfully
-	 * bound a driver before us just skip the driver probe call.
-	 */
-	if (!dev->p->dead && !dev->driver)
-		ret = driver_probe_device(drv, dev);
-
+	ret = driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	return ret;
@@ -1047,19 +1043,11 @@ static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie)
 {
 	struct device *dev = _dev;
 	struct device_driver *drv;
-	int ret = 0;
+	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-
 	drv = dev->p->async_driver;
-
-	/*
-	 * If device has been removed or someone has already successfully
-	 * bound a driver before us just skip the driver probe call.
-	 */
-	if (!dev->p->dead && !dev->driver)
-		ret = driver_probe_device(drv, dev);
-
+	ret = driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	dev_dbg(dev, "driver %s async attach completed: %d\n", drv->name, ret);
-- 
2.30.2

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[PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

Checking if the dev is dead or if the dev is already bound is a required
precondition to invoking driver_probe_device(). All the call chains
leading here duplicate these checks.

Add it directly to driver_probe_device() so the precondition is clear and
remove the checks from device_driver_attach() and
__driver_attach_async_helper().

The other call chain going through __device_attach_driver() does have
these same checks but they are inlined into logic higher up the call stack
and can't be removed.

The sysfs uAPI call chain starting at bind_store() is a bit confused
because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
this to always return -EBUSY and always read dev->driver under its lock.

Done in preparation for the next patches which will add additional
callers to driver_probe_device() and will need these checks as well.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
[hch: drop the extra checks in device_driver_attach and bind_store]
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/bus.c |  2 +-
 drivers/base/dd.c  | 32 ++++++++++----------------------
 2 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 36d0c654ea61..7de13302e8c8 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -210,7 +210,7 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf,
 	int err = -ENODEV;
 
 	dev = bus_find_device_by_name(bus, NULL, buf);
-	if (dev && dev->driver == NULL && driver_match_device(drv, dev)) {
+	if (dev && driver_match_device(drv, dev)) {
 		err = device_driver_attach(drv, dev);
 
 		if (err > 0) {
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index ecd7cf848daf..7477d3322b3a 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -733,8 +733,9 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
  * @drv: driver to bind a device to
  * @dev: device to try to bind to the driver
  *
- * This function returns -ENODEV if the device is not registered,
- * 1 if the device is bound successfully and 0 otherwise.
+ * This function returns -ENODEV if the device is not registered, -EBUSY if it
+ * already has a driver, and 1 if the device is bound successfully and 0
+ * otherwise.
  *
  * This function must be called with @dev lock held.  When called for a
  * USB interface, @dev->parent lock must be held as well.
@@ -745,8 +746,10 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
 {
 	int ret = 0;
 
-	if (!device_is_registered(dev))
+	if (dev->p->dead || !device_is_registered(dev))
 		return -ENODEV;
+	if (dev->driver)
+		return -EBUSY;
 
 	dev->can_match = true;
 	pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
@@ -1027,17 +1030,10 @@ static void __device_driver_unlock(struct device *dev, struct device *parent)
  */
 int device_driver_attach(struct device_driver *drv, struct device *dev)
 {
-	int ret = 0;
+	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-
-	/*
-	 * If device has been removed or someone has already successfully
-	 * bound a driver before us just skip the driver probe call.
-	 */
-	if (!dev->p->dead && !dev->driver)
-		ret = driver_probe_device(drv, dev);
-
+	ret = driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	return ret;
@@ -1047,19 +1043,11 @@ static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie)
 {
 	struct device *dev = _dev;
 	struct device_driver *drv;
-	int ret = 0;
+	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-
 	drv = dev->p->async_driver;
-
-	/*
-	 * If device has been removed or someone has already successfully
-	 * bound a driver before us just skip the driver probe call.
-	 */
-	if (!dev->p->dead && !dev->driver)
-		ret = driver_probe_device(drv, dev);
-
+	ret = driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	dev_dbg(dev, "driver %s async attach completed: %d\n", drv->name, ret);
-- 
2.30.2

Re: [Intel-gfx] [PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:37PM +0200, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@nvidia.com>
> 
> Checking if the dev is dead or if the dev is already bound is a required
> precondition to invoking driver_probe_device(). All the call chains
> leading here duplicate these checks.
> 
> Add it directly to driver_probe_device() so the precondition is clear and
> remove the checks from device_driver_attach() and
> __driver_attach_async_helper().
> 
> The other call chain going through __device_attach_driver() does have
> these same checks but they are inlined into logic higher up the call stack
> and can't be removed.
> 
> The sysfs uAPI call chain starting at bind_store() is a bit confused
> because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
> otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
> this to always return -EBUSY and always read dev->driver under its lock.
> 
> Done in preparation for the next patches which will add additional
> callers to driver_probe_device() and will need these checks as well.
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> [hch: drop the extra checks in device_driver_attach and bind_store]
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Re: [PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:37PM +0200, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@nvidia.com>
> 
> Checking if the dev is dead or if the dev is already bound is a required
> precondition to invoking driver_probe_device(). All the call chains
> leading here duplicate these checks.
> 
> Add it directly to driver_probe_device() so the precondition is clear and
> remove the checks from device_driver_attach() and
> __driver_attach_async_helper().
> 
> The other call chain going through __device_attach_driver() does have
> these same checks but they are inlined into logic higher up the call stack
> and can't be removed.
> 
> The sysfs uAPI call chain starting at bind_store() is a bit confused
> because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
> otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
> this to always return -EBUSY and always read dev->driver under its lock.
> 
> Done in preparation for the next patches which will add additional
> callers to driver_probe_device() and will need these checks as well.
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> [hch: drop the extra checks in device_driver_attach and bind_store]
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:37PM +0200, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@nvidia.com>
> 
> Checking if the dev is dead or if the dev is already bound is a required
> precondition to invoking driver_probe_device(). All the call chains
> leading here duplicate these checks.
> 
> Add it directly to driver_probe_device() so the precondition is clear and
> remove the checks from device_driver_attach() and
> __driver_attach_async_helper().
> 
> The other call chain going through __device_attach_driver() does have
> these same checks but they are inlined into logic higher up the call stack
> and can't be removed.
> 
> The sysfs uAPI call chain starting at bind_store() is a bit confused
> because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
> otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
> this to always return -EBUSY and always read dev->driver under its lock.
> 
> Done in preparation for the next patches which will add additional
> callers to driver_probe_device() and will need these checks as well.
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> [hch: drop the extra checks in device_driver_attach and bind_store]
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [Intel-gfx] [PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> Checking if the dev is dead or if the dev is already bound is a required
> precondition to invoking driver_probe_device(). All the call chains
> leading here duplicate these checks.
>
> Add it directly to driver_probe_device() so the precondition is clear and
> remove the checks from device_driver_attach() and
> __driver_attach_async_helper().
>
> The other call chain going through __device_attach_driver() does have
> these same checks but they are inlined into logic higher up the call stack
> and can't be removed.
>
> The sysfs uAPI call chain starting at bind_store() is a bit confused
> because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
> otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
> this to always return -EBUSY and always read dev->driver under its lock.
>
> Done in preparation for the next patches which will add additional
> callers to driver_probe_device() and will need these checks as well.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> [hch: drop the extra checks in device_driver_attach and bind_store]
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  2 +-
>  drivers/base/dd.c  | 32 ++++++++++----------------------
>  2 files changed, 11 insertions(+), 23 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

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Re: [PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> Checking if the dev is dead or if the dev is already bound is a required
> precondition to invoking driver_probe_device(). All the call chains
> leading here duplicate these checks.
>
> Add it directly to driver_probe_device() so the precondition is clear and
> remove the checks from device_driver_attach() and
> __driver_attach_async_helper().
>
> The other call chain going through __device_attach_driver() does have
> these same checks but they are inlined into logic higher up the call stack
> and can't be removed.
>
> The sysfs uAPI call chain starting at bind_store() is a bit confused
> because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
> otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
> this to always return -EBUSY and always read dev->driver under its lock.
>
> Done in preparation for the next patches which will add additional
> callers to driver_probe_device() and will need these checks as well.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> [hch: drop the extra checks in device_driver_attach and bind_store]
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  2 +-
>  drivers/base/dd.c  | 32 ++++++++++----------------------
>  2 files changed, 11 insertions(+), 23 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

Re: [PATCH 01/10] driver core: Pull required checks into driver_probe_device()

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> Checking if the dev is dead or if the dev is already bound is a required
> precondition to invoking driver_probe_device(). All the call chains
> leading here duplicate these checks.
>
> Add it directly to driver_probe_device() so the precondition is clear and
> remove the checks from device_driver_attach() and
> __driver_attach_async_helper().
>
> The other call chain going through __device_attach_driver() does have
> these same checks but they are inlined into logic higher up the call stack
> and can't be removed.
>
> The sysfs uAPI call chain starting at bind_store() is a bit confused
> because it reads dev->driver unlocked and returns -ENODEV if it is !NULL,
> otherwise it reads it again under lock and returns 0 if it is !NULL. Fix
> this to always return -EBUSY and always read dev->driver under its lock.
>
> Done in preparation for the next patches which will add additional
> callers to driver_probe_device() and will need these checks as well.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> [hch: drop the extra checks in device_driver_attach and bind_store]
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  2 +-
>  drivers/base/dd.c  | 32 ++++++++++----------------------
>  2 files changed, 11 insertions(+), 23 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

[Intel-gfx] [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Christoph Hellwig]

really_probe tries to special case errors from ->probe, but due to all
other initialization added to the function over time now a lot of
internal errors hit that code path as well.  Untangle that by adding
a new probe_err local variable and apply the special casing only to
that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
 1 file changed, 41 insertions(+), 31 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 7477d3322b3a..999bc737a8f0 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(state_synced);
 
+
+static int call_driver_probe(struct device *dev, struct device_driver *drv)
+{
+	int ret = 0;
+
+	if (dev->bus->probe)
+		ret = dev->bus->probe(dev);
+	else if (drv->probe)
+		ret = drv->probe(dev);
+
+	switch (ret) {
+	case -EPROBE_DEFER:
+		/* Driver requested deferred probing */
+		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
+		break;
+	case -ENODEV:
+	case -ENXIO:
+		pr_debug("%s: probe of %s rejects match %d\n",
+			 drv->name, dev_name(dev), ret);
+		break;
+	default:
+		/* driver matched but the probe failed */
+		pr_warn("%s: probe of %s failed with error %d\n",
+			drv->name, dev_name(dev), ret);
+		break;
+	}
+
+	return ret;
+}
+
 static int really_probe(struct device *dev, struct device_driver *drv)
 {
-	int ret = -EPROBE_DEFER;
 	int local_trigger_count = atomic_read(&deferred_trigger_count);
 	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
 			   !drv->suppress_bind_attrs;
+	int ret = -EPROBE_DEFER, probe_ret = 0;
 
 	if (defer_all_probes) {
 		/*
@@ -572,15 +602,15 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 			goto probe_failed;
 	}
 
-	if (dev->bus->probe) {
-		ret = dev->bus->probe(dev);
-		if (ret)
-			goto probe_failed;
-	} else if (drv->probe) {
-		ret = drv->probe(dev);
-		if (ret)
-			goto probe_failed;
-	}
+	probe_ret = call_driver_probe(dev, drv);
+	if (probe_ret) {
+		/*
+		 * Ignore errors returned by ->probe so that the next driver can
+		 * try its luck.
+		   */
+		ret = 0;
+		goto probe_failed;
+	} 
 
 	if (device_add_groups(dev, drv->dev_groups)) {
 		dev_err(dev, "device_add_groups() failed\n");
@@ -650,28 +680,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->dismiss(dev);
 	pm_runtime_reinit(dev);
 	dev_pm_set_driver_flags(dev, 0);
-
-	switch (ret) {
-	case -EPROBE_DEFER:
-		/* Driver requested deferred probing */
-		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
+	if (probe_ret == -EPROBE_DEFER)
 		driver_deferred_probe_add_trigger(dev, local_trigger_count);
-		break;
-	case -ENODEV:
-	case -ENXIO:
-		pr_debug("%s: probe of %s rejects match %d\n",
-			 drv->name, dev_name(dev), ret);
-		break;
-	default:
-		/* driver matched but the probe failed */
-		pr_warn("%s: probe of %s failed with error %d\n",
-			drv->name, dev_name(dev), ret);
-	}
-	/*
-	 * Ignore errors returned by ->probe so that the next driver can try
-	 * its luck.
-	 */
-	ret = 0;
 done:
 	atomic_dec(&probe_count);
 	wake_up_all(&probe_waitqueue);
-- 
2.30.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Christoph Hellwig]

really_probe tries to special case errors from ->probe, but due to all
other initialization added to the function over time now a lot of
internal errors hit that code path as well.  Untangle that by adding
a new probe_err local variable and apply the special casing only to
that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
 1 file changed, 41 insertions(+), 31 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 7477d3322b3a..999bc737a8f0 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(state_synced);
 
+
+static int call_driver_probe(struct device *dev, struct device_driver *drv)
+{
+	int ret = 0;
+
+	if (dev->bus->probe)
+		ret = dev->bus->probe(dev);
+	else if (drv->probe)
+		ret = drv->probe(dev);
+
+	switch (ret) {
+	case -EPROBE_DEFER:
+		/* Driver requested deferred probing */
+		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
+		break;
+	case -ENODEV:
+	case -ENXIO:
+		pr_debug("%s: probe of %s rejects match %d\n",
+			 drv->name, dev_name(dev), ret);
+		break;
+	default:
+		/* driver matched but the probe failed */
+		pr_warn("%s: probe of %s failed with error %d\n",
+			drv->name, dev_name(dev), ret);
+		break;
+	}
+
+	return ret;
+}
+
 static int really_probe(struct device *dev, struct device_driver *drv)
 {
-	int ret = -EPROBE_DEFER;
 	int local_trigger_count = atomic_read(&deferred_trigger_count);
 	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
 			   !drv->suppress_bind_attrs;
+	int ret = -EPROBE_DEFER, probe_ret = 0;
 
 	if (defer_all_probes) {
 		/*
@@ -572,15 +602,15 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 			goto probe_failed;
 	}
 
-	if (dev->bus->probe) {
-		ret = dev->bus->probe(dev);
-		if (ret)
-			goto probe_failed;
-	} else if (drv->probe) {
-		ret = drv->probe(dev);
-		if (ret)
-			goto probe_failed;
-	}
+	probe_ret = call_driver_probe(dev, drv);
+	if (probe_ret) {
+		/*
+		 * Ignore errors returned by ->probe so that the next driver can
+		 * try its luck.
+		   */
+		ret = 0;
+		goto probe_failed;
+	} 
 
 	if (device_add_groups(dev, drv->dev_groups)) {
 		dev_err(dev, "device_add_groups() failed\n");
@@ -650,28 +680,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->dismiss(dev);
 	pm_runtime_reinit(dev);
 	dev_pm_set_driver_flags(dev, 0);
-
-	switch (ret) {
-	case -EPROBE_DEFER:
-		/* Driver requested deferred probing */
-		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
+	if (probe_ret == -EPROBE_DEFER)
 		driver_deferred_probe_add_trigger(dev, local_trigger_count);
-		break;
-	case -ENODEV:
-	case -ENXIO:
-		pr_debug("%s: probe of %s rejects match %d\n",
-			 drv->name, dev_name(dev), ret);
-		break;
-	default:
-		/* driver matched but the probe failed */
-		pr_warn("%s: probe of %s failed with error %d\n",
-			drv->name, dev_name(dev), ret);
-	}
-	/*
-	 * Ignore errors returned by ->probe so that the next driver can try
-	 * its luck.
-	 */
-	ret = 0;
 done:
 	atomic_dec(&probe_count);
 	wake_up_all(&probe_waitqueue);
-- 
2.30.2

Re: [Intel-gfx] [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Kirti Wankhede]

On 6/14/2021 8:38 PM, Christoph Hellwig wrote:
> really_probe tries to special case errors from ->probe, but due to all
> other initialization added to the function over time now a lot of
> internal errors hit that code path as well.  Untangle that by adding
> a new probe_err local variable and apply the special casing only to
> that.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
>   1 file changed, 41 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 7477d3322b3a..999bc737a8f0 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
>   }
>   static DEVICE_ATTR_RO(state_synced);
>   
> +
> +static int call_driver_probe(struct device *dev, struct device_driver *drv)
> +{
> +	int ret = 0;
> +
> +	if (dev->bus->probe)
> +		ret = dev->bus->probe(dev);
> +	else if (drv->probe)
> +		ret = drv->probe(dev);
> +
> +	switch (ret) {
> +	case -EPROBE_DEFER:
> +		/* Driver requested deferred probing */
> +		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +		break;
> +	case -ENODEV:
> +	case -ENXIO:
> +		pr_debug("%s: probe of %s rejects match %d\n",
> +			 drv->name, dev_name(dev), ret);
> +		break;
> +	default:
> +		/* driver matched but the probe failed */
> +		pr_warn("%s: probe of %s failed with error %d\n",
> +			drv->name, dev_name(dev), ret);

There should be case 0, that is, success case before default case as below:
+	case 0:
+		/* Driver returned success */
+		break;

Otherwise even in case of success, above warning would mislead that 
probe has failed.

Thanks,
Kirti

> +		break;
> +	}
> +
> +	return ret;
> +}
> +
>   static int really_probe(struct device *dev, struct device_driver *drv)
>   {
> -	int ret = -EPROBE_DEFER;
>   	int local_trigger_count = atomic_read(&deferred_trigger_count);
>   	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
>   			   !drv->suppress_bind_attrs;
> +	int ret = -EPROBE_DEFER, probe_ret = 0;
>   
>   	if (defer_all_probes) {
>   		/*
> @@ -572,15 +602,15 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>   			goto probe_failed;
>   	}
>   
> -	if (dev->bus->probe) {
> -		ret = dev->bus->probe(dev);
> -		if (ret)
> -			goto probe_failed;
> -	} else if (drv->probe) {
> -		ret = drv->probe(dev);
> -		if (ret)
> -			goto probe_failed;
> -	}
> +	probe_ret = call_driver_probe(dev, drv);
> +	if (probe_ret) {
> +		/*
> +		 * Ignore errors returned by ->probe so that the next driver can
> +		 * try its luck.
> +		   */
> +		ret = 0;
> +		goto probe_failed;
> +	}
>   
>   	if (device_add_groups(dev, drv->dev_groups)) {
>   		dev_err(dev, "device_add_groups() failed\n");
> @@ -650,28 +680,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>   		dev->pm_domain->dismiss(dev);
>   	pm_runtime_reinit(dev);
>   	dev_pm_set_driver_flags(dev, 0);
> -
> -	switch (ret) {
> -	case -EPROBE_DEFER:
> -		/* Driver requested deferred probing */
> -		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +	if (probe_ret == -EPROBE_DEFER)
>   		driver_deferred_probe_add_trigger(dev, local_trigger_count);
> -		break;
> -	case -ENODEV:
> -	case -ENXIO:
> -		pr_debug("%s: probe of %s rejects match %d\n",
> -			 drv->name, dev_name(dev), ret);
> -		break;
> -	default:
> -		/* driver matched but the probe failed */
> -		pr_warn("%s: probe of %s failed with error %d\n",
> -			drv->name, dev_name(dev), ret);
> -	}
> -	/*
> -	 * Ignore errors returned by ->probe so that the next driver can try
> -	 * its luck.
> -	 */
> -	ret = 0;
>   done:
>   	atomic_dec(&probe_count);
>   	wake_up_all(&probe_waitqueue);
> 
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Kirti Wankhede]

On 6/14/2021 8:38 PM, Christoph Hellwig wrote:
> really_probe tries to special case errors from ->probe, but due to all
> other initialization added to the function over time now a lot of
> internal errors hit that code path as well.  Untangle that by adding
> a new probe_err local variable and apply the special casing only to
> that.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
>   1 file changed, 41 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 7477d3322b3a..999bc737a8f0 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
>   }
>   static DEVICE_ATTR_RO(state_synced);
>   
> +
> +static int call_driver_probe(struct device *dev, struct device_driver *drv)
> +{
> +	int ret = 0;
> +
> +	if (dev->bus->probe)
> +		ret = dev->bus->probe(dev);
> +	else if (drv->probe)
> +		ret = drv->probe(dev);
> +
> +	switch (ret) {
> +	case -EPROBE_DEFER:
> +		/* Driver requested deferred probing */
> +		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +		break;
> +	case -ENODEV:
> +	case -ENXIO:
> +		pr_debug("%s: probe of %s rejects match %d\n",
> +			 drv->name, dev_name(dev), ret);
> +		break;
> +	default:
> +		/* driver matched but the probe failed */
> +		pr_warn("%s: probe of %s failed with error %d\n",
> +			drv->name, dev_name(dev), ret);

There should be case 0, that is, success case before default case as below:
+	case 0:
+		/* Driver returned success */
+		break;

Otherwise even in case of success, above warning would mislead that 
probe has failed.

Thanks,
Kirti

> +		break;
> +	}
> +
> +	return ret;
> +}
> +
>   static int really_probe(struct device *dev, struct device_driver *drv)
>   {
> -	int ret = -EPROBE_DEFER;
>   	int local_trigger_count = atomic_read(&deferred_trigger_count);
>   	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
>   			   !drv->suppress_bind_attrs;
> +	int ret = -EPROBE_DEFER, probe_ret = 0;
>   
>   	if (defer_all_probes) {
>   		/*
> @@ -572,15 +602,15 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>   			goto probe_failed;
>   	}
>   
> -	if (dev->bus->probe) {
> -		ret = dev->bus->probe(dev);
> -		if (ret)
> -			goto probe_failed;
> -	} else if (drv->probe) {
> -		ret = drv->probe(dev);
> -		if (ret)
> -			goto probe_failed;
> -	}
> +	probe_ret = call_driver_probe(dev, drv);
> +	if (probe_ret) {
> +		/*
> +		 * Ignore errors returned by ->probe so that the next driver can
> +		 * try its luck.
> +		   */
> +		ret = 0;
> +		goto probe_failed;
> +	}
>   
>   	if (device_add_groups(dev, drv->dev_groups)) {
>   		dev_err(dev, "device_add_groups() failed\n");
> @@ -650,28 +680,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>   		dev->pm_domain->dismiss(dev);
>   	pm_runtime_reinit(dev);
>   	dev_pm_set_driver_flags(dev, 0);
> -
> -	switch (ret) {
> -	case -EPROBE_DEFER:
> -		/* Driver requested deferred probing */
> -		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +	if (probe_ret == -EPROBE_DEFER)
>   		driver_deferred_probe_add_trigger(dev, local_trigger_count);
> -		break;
> -	case -ENODEV:
> -	case -ENXIO:
> -		pr_debug("%s: probe of %s rejects match %d\n",
> -			 drv->name, dev_name(dev), ret);
> -		break;
> -	default:
> -		/* driver matched but the probe failed */
> -		pr_warn("%s: probe of %s failed with error %d\n",
> -			drv->name, dev_name(dev), ret);
> -	}
> -	/*
> -	 * Ignore errors returned by ->probe so that the next driver can try
> -	 * its luck.
> -	 */
> -	ret = 0;
>   done:
>   	atomic_dec(&probe_count);
>   	wake_up_all(&probe_waitqueue);
> 

Re: [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Kirti Wankhede]

On 6/14/2021 8:38 PM, Christoph Hellwig wrote:
> really_probe tries to special case errors from ->probe, but due to all
> other initialization added to the function over time now a lot of
> internal errors hit that code path as well.  Untangle that by adding
> a new probe_err local variable and apply the special casing only to
> that.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
>   1 file changed, 41 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 7477d3322b3a..999bc737a8f0 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
>   }
>   static DEVICE_ATTR_RO(state_synced);
>   
> +
> +static int call_driver_probe(struct device *dev, struct device_driver *drv)
> +{
> +	int ret = 0;
> +
> +	if (dev->bus->probe)
> +		ret = dev->bus->probe(dev);
> +	else if (drv->probe)
> +		ret = drv->probe(dev);
> +
> +	switch (ret) {
> +	case -EPROBE_DEFER:
> +		/* Driver requested deferred probing */
> +		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +		break;
> +	case -ENODEV:
> +	case -ENXIO:
> +		pr_debug("%s: probe of %s rejects match %d\n",
> +			 drv->name, dev_name(dev), ret);
> +		break;
> +	default:
> +		/* driver matched but the probe failed */
> +		pr_warn("%s: probe of %s failed with error %d\n",
> +			drv->name, dev_name(dev), ret);

There should be case 0, that is, success case before default case as below:
+	case 0:
+		/* Driver returned success */
+		break;

Otherwise even in case of success, above warning would mislead that 
probe has failed.

Thanks,
Kirti

> +		break;
> +	}
> +
> +	return ret;
> +}
> +
>   static int really_probe(struct device *dev, struct device_driver *drv)
>   {
> -	int ret = -EPROBE_DEFER;
>   	int local_trigger_count = atomic_read(&deferred_trigger_count);
>   	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
>   			   !drv->suppress_bind_attrs;
> +	int ret = -EPROBE_DEFER, probe_ret = 0;
>   
>   	if (defer_all_probes) {
>   		/*
> @@ -572,15 +602,15 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>   			goto probe_failed;
>   	}
>   
> -	if (dev->bus->probe) {
> -		ret = dev->bus->probe(dev);
> -		if (ret)
> -			goto probe_failed;
> -	} else if (drv->probe) {
> -		ret = drv->probe(dev);
> -		if (ret)
> -			goto probe_failed;
> -	}
> +	probe_ret = call_driver_probe(dev, drv);
> +	if (probe_ret) {
> +		/*
> +		 * Ignore errors returned by ->probe so that the next driver can
> +		 * try its luck.
> +		   */
> +		ret = 0;
> +		goto probe_failed;
> +	}
>   
>   	if (device_add_groups(dev, drv->dev_groups)) {
>   		dev_err(dev, "device_add_groups() failed\n");
> @@ -650,28 +680,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>   		dev->pm_domain->dismiss(dev);
>   	pm_runtime_reinit(dev);
>   	dev_pm_set_driver_flags(dev, 0);
> -
> -	switch (ret) {
> -	case -EPROBE_DEFER:
> -		/* Driver requested deferred probing */
> -		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +	if (probe_ret == -EPROBE_DEFER)
>   		driver_deferred_probe_add_trigger(dev, local_trigger_count);
> -		break;
> -	case -ENODEV:
> -	case -ENXIO:
> -		pr_debug("%s: probe of %s rejects match %d\n",
> -			 drv->name, dev_name(dev), ret);
> -		break;
> -	default:
> -		/* driver matched but the probe failed */
> -		pr_warn("%s: probe of %s failed with error %d\n",
> -			drv->name, dev_name(dev), ret);
> -	}
> -	/*
> -	 * Ignore errors returned by ->probe so that the next driver can try
> -	 * its luck.
> -	 */
> -	ret = 0;
>   done:
>   	atomic_dec(&probe_count);
>   	wake_up_all(&probe_waitqueue);
> 

Re: [Intel-gfx] [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:38PM +0200, Christoph Hellwig wrote:
> really_probe tries to special case errors from ->probe, but due to all
> other initialization added to the function over time now a lot of
> internal errors hit that code path as well.  Untangle that by adding
> a new probe_err local variable and apply the special casing only to
> that.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
>  1 file changed, 41 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 7477d3322b3a..999bc737a8f0 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(state_synced);
>  
> +
> +static int call_driver_probe(struct device *dev, struct device_driver *drv)
> +{
> +	int ret = 0;
> +
> +	if (dev->bus->probe)
> +		ret = dev->bus->probe(dev);
> +	else if (drv->probe)
> +		ret = drv->probe(dev);
> +
> +	switch (ret) {
> +	case -EPROBE_DEFER:
> +		/* Driver requested deferred probing */
> +		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +		break;
> +	case -ENODEV:
> +	case -ENXIO:
> +		pr_debug("%s: probe of %s rejects match %d\n",
> +			 drv->name, dev_name(dev), ret);
> +		break;
> +	default:
> +		/* driver matched but the probe failed */
> +		pr_warn("%s: probe of %s failed with error %d\n",
> +			drv->name, dev_name(dev), ret);
> +		break;
> +	}

Like Kirti said, 0 needs to be handled here.  Did this not spew a lot of
warnings in the logs?

And we can fix up the pr_* calls to use dev_* in the future, shows the
evolution of this code...

thanks,

greg k-h
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:38PM +0200, Christoph Hellwig wrote:
> really_probe tries to special case errors from ->probe, but due to all
> other initialization added to the function over time now a lot of
> internal errors hit that code path as well.  Untangle that by adding
> a new probe_err local variable and apply the special casing only to
> that.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
>  1 file changed, 41 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 7477d3322b3a..999bc737a8f0 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(state_synced);
>  
> +
> +static int call_driver_probe(struct device *dev, struct device_driver *drv)
> +{
> +	int ret = 0;
> +
> +	if (dev->bus->probe)
> +		ret = dev->bus->probe(dev);
> +	else if (drv->probe)
> +		ret = drv->probe(dev);
> +
> +	switch (ret) {
> +	case -EPROBE_DEFER:
> +		/* Driver requested deferred probing */
> +		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +		break;
> +	case -ENODEV:
> +	case -ENXIO:
> +		pr_debug("%s: probe of %s rejects match %d\n",
> +			 drv->name, dev_name(dev), ret);
> +		break;
> +	default:
> +		/* driver matched but the probe failed */
> +		pr_warn("%s: probe of %s failed with error %d\n",
> +			drv->name, dev_name(dev), ret);
> +		break;
> +	}

Like Kirti said, 0 needs to be handled here.  Did this not spew a lot of
warnings in the logs?

And we can fix up the pr_* calls to use dev_* in the future, shows the
evolution of this code...

thanks,

greg k-h

Re: [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:38PM +0200, Christoph Hellwig wrote:
> really_probe tries to special case errors from ->probe, but due to all
> other initialization added to the function over time now a lot of
> internal errors hit that code path as well.  Untangle that by adding
> a new probe_err local variable and apply the special casing only to
> that.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/dd.c | 72 +++++++++++++++++++++++++++--------------------
>  1 file changed, 41 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 7477d3322b3a..999bc737a8f0 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -513,12 +513,42 @@ static ssize_t state_synced_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(state_synced);
>  
> +
> +static int call_driver_probe(struct device *dev, struct device_driver *drv)
> +{
> +	int ret = 0;
> +
> +	if (dev->bus->probe)
> +		ret = dev->bus->probe(dev);
> +	else if (drv->probe)
> +		ret = drv->probe(dev);
> +
> +	switch (ret) {
> +	case -EPROBE_DEFER:
> +		/* Driver requested deferred probing */
> +		dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name);
> +		break;
> +	case -ENODEV:
> +	case -ENXIO:
> +		pr_debug("%s: probe of %s rejects match %d\n",
> +			 drv->name, dev_name(dev), ret);
> +		break;
> +	default:
> +		/* driver matched but the probe failed */
> +		pr_warn("%s: probe of %s failed with error %d\n",
> +			drv->name, dev_name(dev), ret);
> +		break;
> +	}

Like Kirti said, 0 needs to be handled here.  Did this not spew a lot of
warnings in the logs?

And we can fix up the pr_* calls to use dev_* in the future, shows the
evolution of this code...

thanks,

greg k-h

Re: [Intel-gfx] [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Christoph Hellwig]

On Tue, Jun 15, 2021 at 07:17:43AM +0200, Greg Kroah-Hartman wrote:
> Like Kirti said, 0 needs to be handled here.  Did this not spew a lot of
> warnings in the logs?

Trying again it did.  But I didn't even notice given all the crap
printed during a typical boot these days..
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Re: [PATCH 02/10] driver core: Better distinguish probe errors in really_probe

[Christoph Hellwig]

On Tue, Jun 15, 2021 at 07:17:43AM +0200, Greg Kroah-Hartman wrote:
> Like Kirti said, 0 needs to be handled here.  Did this not spew a lot of
> warnings in the logs?

Trying again it did.  But I didn't even notice given all the crap
printed during a typical boot these days..

[Intel-gfx] [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Christoph Hellwig]

Currently really_probe() returns 1 on success and 0 if the probe() call
fails. This return code arrangement is designed to be useful for
__device_attach_driver() which is walking the device list and trying every
driver. 0 means to keep trying.

However, it is not useful for the other places that call through to
really_probe() that do actually want to see the probe() return code.

For instance bind_store() would be better to return the actual error code
from the driver's probe method, not discarding it and returning -ENODEV.

Reorganize things so that really_probe() returns the error code from
->probe as a (inverted) positive number, and 0 for successful attach.

With this, __device_attach_driver can ignore the (positive) probe errors,
return 1 to exit the loop for a successful binding and pass on the
other negative errors, while device_driver_attach simplify inverts the
positive errors and returns all errors to the sysfs code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/bus.c |  6 +-----
 drivers/base/dd.c  | 29 ++++++++++++++++++++---------
 2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 7de13302e8c8..1f6b4bd61056 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -212,13 +212,9 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf,
 	dev = bus_find_device_by_name(bus, NULL, buf);
 	if (dev && driver_match_device(drv, dev)) {
 		err = device_driver_attach(drv, dev);
-
-		if (err > 0) {
+		if (!err) {
 			/* success */
 			err = count;
-		} else if (err == 0) {
-			/* driver didn't accept device */
-			err = -ENODEV;
 		}
 	}
 	put_device(dev);
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 999bc737a8f0..4c6af8c062c8 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -605,10 +605,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 	probe_ret = call_driver_probe(dev, drv);
 	if (probe_ret) {
 		/*
-		 * Ignore errors returned by ->probe so that the next driver can
-		 * try its luck.
+		 * Return probe errors as positive values so that the callers
+		 * can distinguish them from other errors.
 		   */
-		ret = 0;
+		ret = -probe_ret;
 		goto probe_failed;
 	} 
 
@@ -651,7 +651,6 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->sync(dev);
 
 	driver_bound(dev);
-	ret = 1;
 	pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
 		 drv->bus->name, __func__, dev_name(dev), drv->name);
 	goto done;
@@ -744,8 +743,8 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
  * @dev: device to try to bind to the driver
  *
  * This function returns -ENODEV if the device is not registered, -EBUSY if it
- * already has a driver, and 1 if the device is bound successfully and 0
- * otherwise.
+ * already has a driver, 0 if the device is bound successfully and a positive
+ * (inverted) error code for failures from the ->probe method.
  *
  * This function must be called with @dev lock held.  When called for a
  * USB interface, @dev->parent lock must be held as well.
@@ -880,7 +879,14 @@ static int __device_attach_driver(struct device_driver *drv, void *_data)
 	if (data->check_async && async_allowed != data->want_async)
 		return 0;
 
-	return driver_probe_device(drv, dev);
+	/*
+	 * Ignore errors returned by ->probe so that the next driver can try
+	 * its luck.
+	 */
+	ret = driver_probe_device(drv, dev);
+	if (ret < 0)
+		return ret;
+	return ret == 0;
 }
 
 static void __device_attach_async_helper(void *_dev, async_cookie_t cookie)
@@ -1036,7 +1042,7 @@ static void __device_driver_unlock(struct device *dev, struct device *parent)
  * @dev: Device to attach it to
  *
  * Manually attach driver to a device. Will acquire both @dev lock and
- * @dev->parent lock if needed.
+ * @dev->parent lock if needed. Returns 0 on success, -ERR on failure.
  */
 int device_driver_attach(struct device_driver *drv, struct device *dev)
 {
@@ -1046,6 +1052,9 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 	ret = driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
+	/* also return probe errors as normal negative errnos */
+	if (ret > 0)
+		ret = -ret;
 	return ret;
 }
 
@@ -1112,7 +1121,9 @@ static int __driver_attach(struct device *dev, void *data)
 		return 0;
 	}
 
-	device_driver_attach(drv, dev);
+	__device_driver_lock(dev, dev->parent);
+	driver_probe_device(drv, dev);
+	__device_driver_unlock(dev, dev->parent);
 
 	return 0;
 }
-- 
2.30.2

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[PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Christoph Hellwig]

Currently really_probe() returns 1 on success and 0 if the probe() call
fails. This return code arrangement is designed to be useful for
__device_attach_driver() which is walking the device list and trying every
driver. 0 means to keep trying.

However, it is not useful for the other places that call through to
really_probe() that do actually want to see the probe() return code.

For instance bind_store() would be better to return the actual error code
from the driver's probe method, not discarding it and returning -ENODEV.

Reorganize things so that really_probe() returns the error code from
->probe as a (inverted) positive number, and 0 for successful attach.

With this, __device_attach_driver can ignore the (positive) probe errors,
return 1 to exit the loop for a successful binding and pass on the
other negative errors, while device_driver_attach simplify inverts the
positive errors and returns all errors to the sysfs code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/bus.c |  6 +-----
 drivers/base/dd.c  | 29 ++++++++++++++++++++---------
 2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 7de13302e8c8..1f6b4bd61056 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -212,13 +212,9 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf,
 	dev = bus_find_device_by_name(bus, NULL, buf);
 	if (dev && driver_match_device(drv, dev)) {
 		err = device_driver_attach(drv, dev);
-
-		if (err > 0) {
+		if (!err) {
 			/* success */
 			err = count;
-		} else if (err == 0) {
-			/* driver didn't accept device */
-			err = -ENODEV;
 		}
 	}
 	put_device(dev);
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 999bc737a8f0..4c6af8c062c8 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -605,10 +605,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 	probe_ret = call_driver_probe(dev, drv);
 	if (probe_ret) {
 		/*
-		 * Ignore errors returned by ->probe so that the next driver can
-		 * try its luck.
+		 * Return probe errors as positive values so that the callers
+		 * can distinguish them from other errors.
 		   */
-		ret = 0;
+		ret = -probe_ret;
 		goto probe_failed;
 	} 
 
@@ -651,7 +651,6 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->sync(dev);
 
 	driver_bound(dev);
-	ret = 1;
 	pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
 		 drv->bus->name, __func__, dev_name(dev), drv->name);
 	goto done;
@@ -744,8 +743,8 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
  * @dev: device to try to bind to the driver
  *
  * This function returns -ENODEV if the device is not registered, -EBUSY if it
- * already has a driver, and 1 if the device is bound successfully and 0
- * otherwise.
+ * already has a driver, 0 if the device is bound successfully and a positive
+ * (inverted) error code for failures from the ->probe method.
  *
  * This function must be called with @dev lock held.  When called for a
  * USB interface, @dev->parent lock must be held as well.
@@ -880,7 +879,14 @@ static int __device_attach_driver(struct device_driver *drv, void *_data)
 	if (data->check_async && async_allowed != data->want_async)
 		return 0;
 
-	return driver_probe_device(drv, dev);
+	/*
+	 * Ignore errors returned by ->probe so that the next driver can try
+	 * its luck.
+	 */
+	ret = driver_probe_device(drv, dev);
+	if (ret < 0)
+		return ret;
+	return ret == 0;
 }
 
 static void __device_attach_async_helper(void *_dev, async_cookie_t cookie)
@@ -1036,7 +1042,7 @@ static void __device_driver_unlock(struct device *dev, struct device *parent)
  * @dev: Device to attach it to
  *
  * Manually attach driver to a device. Will acquire both @dev lock and
- * @dev->parent lock if needed.
+ * @dev->parent lock if needed. Returns 0 on success, -ERR on failure.
  */
 int device_driver_attach(struct device_driver *drv, struct device *dev)
 {
@@ -1046,6 +1052,9 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 	ret = driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
+	/* also return probe errors as normal negative errnos */
+	if (ret > 0)
+		ret = -ret;
 	return ret;
 }
 
@@ -1112,7 +1121,9 @@ static int __driver_attach(struct device *dev, void *data)
 		return 0;
 	}
 
-	device_driver_attach(drv, dev);
+	__device_driver_lock(dev, dev->parent);
+	driver_probe_device(drv, dev);
+	__device_driver_unlock(dev, dev->parent);
 
 	return 0;
 }
-- 
2.30.2

Re: [Intel-gfx] [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:39PM +0200, Christoph Hellwig wrote:
> Currently really_probe() returns 1 on success and 0 if the probe() call
> fails. This return code arrangement is designed to be useful for
> __device_attach_driver() which is walking the device list and trying every
> driver. 0 means to keep trying.
> 
> However, it is not useful for the other places that call through to
> really_probe() that do actually want to see the probe() return code.
> 
> For instance bind_store() would be better to return the actual error code
> from the driver's probe method, not discarding it and returning -ENODEV.
> 
> Reorganize things so that really_probe() returns the error code from
> ->probe as a (inverted) positive number, and 0 for successful attach.
> 
> With this, __device_attach_driver can ignore the (positive) probe errors,
> return 1 to exit the loop for a successful binding and pass on the
> other negative errors, while device_driver_attach simplify inverts the
> positive errors and returns all errors to the sysfs code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  6 +-----
>  drivers/base/dd.c  | 29 ++++++++++++++++++++---------
>  2 files changed, 21 insertions(+), 14 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Re: [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:39PM +0200, Christoph Hellwig wrote:
> Currently really_probe() returns 1 on success and 0 if the probe() call
> fails. This return code arrangement is designed to be useful for
> __device_attach_driver() which is walking the device list and trying every
> driver. 0 means to keep trying.
> 
> However, it is not useful for the other places that call through to
> really_probe() that do actually want to see the probe() return code.
> 
> For instance bind_store() would be better to return the actual error code
> from the driver's probe method, not discarding it and returning -ENODEV.
> 
> Reorganize things so that really_probe() returns the error code from
> ->probe as a (inverted) positive number, and 0 for successful attach.
> 
> With this, __device_attach_driver can ignore the (positive) probe errors,
> return 1 to exit the loop for a successful binding and pass on the
> other negative errors, while device_driver_attach simplify inverts the
> positive errors and returns all errors to the sysfs code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  6 +-----
>  drivers/base/dd.c  | 29 ++++++++++++++++++++---------
>  2 files changed, 21 insertions(+), 14 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:39PM +0200, Christoph Hellwig wrote:
> Currently really_probe() returns 1 on success and 0 if the probe() call
> fails. This return code arrangement is designed to be useful for
> __device_attach_driver() which is walking the device list and trying every
> driver. 0 means to keep trying.
> 
> However, it is not useful for the other places that call through to
> really_probe() that do actually want to see the probe() return code.
> 
> For instance bind_store() would be better to return the actual error code
> from the driver's probe method, not discarding it and returning -ENODEV.
> 
> Reorganize things so that really_probe() returns the error code from
> ->probe as a (inverted) positive number, and 0 for successful attach.
> 
> With this, __device_attach_driver can ignore the (positive) probe errors,
> return 1 to exit the loop for a successful binding and pass on the
> other negative errors, while device_driver_attach simplify inverts the
> positive errors and returns all errors to the sysfs code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  6 +-----
>  drivers/base/dd.c  | 29 ++++++++++++++++++++---------
>  2 files changed, 21 insertions(+), 14 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [Intel-gfx] [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> Currently really_probe() returns 1 on success and 0 if the probe() call
> fails. This return code arrangement is designed to be useful for
> __device_attach_driver() which is walking the device list and trying every
> driver. 0 means to keep trying.
>
> However, it is not useful for the other places that call through to
> really_probe() that do actually want to see the probe() return code.
>
> For instance bind_store() would be better to return the actual error code
> from the driver's probe method, not discarding it and returning -ENODEV.
>
> Reorganize things so that really_probe() returns the error code from
> ->probe as a (inverted) positive number, and 0 for successful attach.
>
> With this, __device_attach_driver can ignore the (positive) probe errors,
> return 1 to exit the loop for a successful binding and pass on the
> other negative errors, while device_driver_attach simplify inverts the
> positive errors and returns all errors to the sysfs code.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  6 +-----
>  drivers/base/dd.c  | 29 ++++++++++++++++++++---------
>  2 files changed, 21 insertions(+), 14 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

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Re: [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> Currently really_probe() returns 1 on success and 0 if the probe() call
> fails. This return code arrangement is designed to be useful for
> __device_attach_driver() which is walking the device list and trying every
> driver. 0 means to keep trying.
>
> However, it is not useful for the other places that call through to
> really_probe() that do actually want to see the probe() return code.
>
> For instance bind_store() would be better to return the actual error code
> from the driver's probe method, not discarding it and returning -ENODEV.
>
> Reorganize things so that really_probe() returns the error code from
> ->probe as a (inverted) positive number, and 0 for successful attach.
>
> With this, __device_attach_driver can ignore the (positive) probe errors,
> return 1 to exit the loop for a successful binding and pass on the
> other negative errors, while device_driver_attach simplify inverts the
> positive errors and returns all errors to the sysfs code.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  6 +-----
>  drivers/base/dd.c  | 29 ++++++++++++++++++++---------
>  2 files changed, 21 insertions(+), 14 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

Re: [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> Currently really_probe() returns 1 on success and 0 if the probe() call
> fails. This return code arrangement is designed to be useful for
> __device_attach_driver() which is walking the device list and trying every
> driver. 0 means to keep trying.
>
> However, it is not useful for the other places that call through to
> really_probe() that do actually want to see the probe() return code.
>
> For instance bind_store() would be better to return the actual error code
> from the driver's probe method, not discarding it and returning -ENODEV.
>
> Reorganize things so that really_probe() returns the error code from
> ->probe as a (inverted) positive number, and 0 for successful attach.
>
> With this, __device_attach_driver can ignore the (positive) probe errors,
> return 1 to exit the loop for a successful binding and pass on the
> other negative errors, while device_driver_attach simplify inverts the
> positive errors and returns all errors to the sysfs code.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/bus.c |  6 +-----
>  drivers/base/dd.c  | 29 ++++++++++++++++++++---------
>  2 files changed, 21 insertions(+), 14 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

[Intel-gfx] [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Christoph Hellwig]

EPROBE_DEFER is an internal kernel error code and it should not be leaked
to userspace via the bind_store() sysfs. Userspace doesn't have this
constant and cannot understand it.

Further, it doesn't really make sense to have userspace trigger a deferred
probe via bind_store(), which could eventually succeed, while
simultaneously returning an error back.

Resolve this by splitting driver_probe_device so that the version used
by the sysfs binding that turns EPROBE_DEFER into -EAGAIN, while the one
used for internally binding keeps the error code, and calls
driver_deferred_probe_add where needed.  This call is now a little later,
which harmless, and the trigger reinjection check now also happens for the
always_defer case, which is not required but otherwise harmless.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/dd.c | 72 +++++++++++++++++++++++++----------------------
 1 file changed, 39 insertions(+), 33 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 4c6af8c062c8..8c65673e344c 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -491,15 +491,6 @@ EXPORT_SYMBOL_GPL(device_bind_driver);
 static atomic_t probe_count = ATOMIC_INIT(0);
 static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue);
 
-static void driver_deferred_probe_add_trigger(struct device *dev,
-					      int local_trigger_count)
-{
-	driver_deferred_probe_add(dev);
-	/* Did a trigger occur while probing? Need to re-trigger if yes */
-	if (local_trigger_count != atomic_read(&deferred_trigger_count))
-		driver_deferred_probe_trigger();
-}
-
 static ssize_t state_synced_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
@@ -545,10 +536,9 @@ static int call_driver_probe(struct device *dev, struct device_driver *drv)
 
 static int really_probe(struct device *dev, struct device_driver *drv)
 {
-	int local_trigger_count = atomic_read(&deferred_trigger_count);
 	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
 			   !drv->suppress_bind_attrs;
-	int ret = -EPROBE_DEFER, probe_ret = 0;
+	int ret, probe_ret = 0;
 
 	if (defer_all_probes) {
 		/*
@@ -557,13 +547,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		 * wait_for_device_probe() right after that to avoid any races.
 		 */
 		dev_dbg(dev, "Driver %s force probe deferral\n", drv->name);
-		driver_deferred_probe_add(dev);
-		return ret;
+		return -EPROBE_DEFER;
 	}
 
 	ret = device_links_check_suppliers(dev);
-	if (ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 	if (ret)
 		return ret;
 
@@ -679,8 +666,6 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->dismiss(dev);
 	pm_runtime_reinit(dev);
 	dev_pm_set_driver_flags(dev, 0);
-	if (probe_ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 done:
 	atomic_dec(&probe_count);
 	wake_up_all(&probe_waitqueue);
@@ -737,21 +722,7 @@ void wait_for_device_probe(void)
 }
 EXPORT_SYMBOL_GPL(wait_for_device_probe);
 
-/**
- * driver_probe_device - attempt to bind device & driver together
- * @drv: driver to bind a device to
- * @dev: device to try to bind to the driver
- *
- * This function returns -ENODEV if the device is not registered, -EBUSY if it
- * already has a driver, 0 if the device is bound successfully and a positive
- * (inverted) error code for failures from the ->probe method.
- *
- * This function must be called with @dev lock held.  When called for a
- * USB interface, @dev->parent lock must be held as well.
- *
- * If the device has a parent, runtime-resume the parent before driver probing.
- */
-static int driver_probe_device(struct device_driver *drv, struct device *dev)
+static int __driver_probe_device(struct device_driver *drv, struct device *dev)
 {
 	int ret = 0;
 
@@ -782,6 +753,39 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
 	return ret;
 }
 
+/**
+ * driver_probe_device - attempt to bind device & driver together
+ * @drv: driver to bind a device to
+ * @dev: device to try to bind to the driver
+ *
+ * This function returns -ENODEV if the device is not registered, -EBUSY if it
+ * already has a driver, 0 if the device is bound successfully and a positive
+ * (inverted) error code for failures from the ->probe method.
+ *
+ * This function must be called with @dev lock held.  When called for a
+ * USB interface, @dev->parent lock must be held as well.
+ *
+ * If the device has a parent, runtime-resume the parent before driver probing.
+ */
+static int driver_probe_device(struct device_driver *drv, struct device *dev)
+{
+	int trigger_count = atomic_read(&deferred_trigger_count);
+	int ret;
+
+	ret = __driver_probe_device(drv, dev);
+	if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) {
+		driver_deferred_probe_add(dev);
+
+		/*
+		 * Did a trigger occur while probing? Need to re-trigger if yes
+		 */
+		if (trigger_count != atomic_read(&deferred_trigger_count) &&
+		    !defer_all_probes)
+			driver_deferred_probe_trigger();
+	}
+	return ret;
+}
+
 static inline bool cmdline_requested_async_probing(const char *drv_name)
 {
 	return parse_option_str(async_probe_drv_names, drv_name);
@@ -1049,12 +1053,14 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-	ret = driver_probe_device(drv, dev);
+	ret = __driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	/* also return probe errors as normal negative errnos */
 	if (ret > 0)
 		ret = -ret;
+	if (ret == -EPROBE_DEFER)
+		return -EAGAIN;
 	return ret;
 }
 
-- 
2.30.2

_______________________________________________
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[PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Christoph Hellwig]

EPROBE_DEFER is an internal kernel error code and it should not be leaked
to userspace via the bind_store() sysfs. Userspace doesn't have this
constant and cannot understand it.

Further, it doesn't really make sense to have userspace trigger a deferred
probe via bind_store(), which could eventually succeed, while
simultaneously returning an error back.

Resolve this by splitting driver_probe_device so that the version used
by the sysfs binding that turns EPROBE_DEFER into -EAGAIN, while the one
used for internally binding keeps the error code, and calls
driver_deferred_probe_add where needed.  This call is now a little later,
which harmless, and the trigger reinjection check now also happens for the
always_defer case, which is not required but otherwise harmless.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/dd.c | 72 +++++++++++++++++++++++++----------------------
 1 file changed, 39 insertions(+), 33 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 4c6af8c062c8..8c65673e344c 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -491,15 +491,6 @@ EXPORT_SYMBOL_GPL(device_bind_driver);
 static atomic_t probe_count = ATOMIC_INIT(0);
 static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue);
 
-static void driver_deferred_probe_add_trigger(struct device *dev,
-					      int local_trigger_count)
-{
-	driver_deferred_probe_add(dev);
-	/* Did a trigger occur while probing? Need to re-trigger if yes */
-	if (local_trigger_count != atomic_read(&deferred_trigger_count))
-		driver_deferred_probe_trigger();
-}
-
 static ssize_t state_synced_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
@@ -545,10 +536,9 @@ static int call_driver_probe(struct device *dev, struct device_driver *drv)
 
 static int really_probe(struct device *dev, struct device_driver *drv)
 {
-	int local_trigger_count = atomic_read(&deferred_trigger_count);
 	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
 			   !drv->suppress_bind_attrs;
-	int ret = -EPROBE_DEFER, probe_ret = 0;
+	int ret, probe_ret = 0;
 
 	if (defer_all_probes) {
 		/*
@@ -557,13 +547,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		 * wait_for_device_probe() right after that to avoid any races.
 		 */
 		dev_dbg(dev, "Driver %s force probe deferral\n", drv->name);
-		driver_deferred_probe_add(dev);
-		return ret;
+		return -EPROBE_DEFER;
 	}
 
 	ret = device_links_check_suppliers(dev);
-	if (ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 	if (ret)
 		return ret;
 
@@ -679,8 +666,6 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->dismiss(dev);
 	pm_runtime_reinit(dev);
 	dev_pm_set_driver_flags(dev, 0);
-	if (probe_ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 done:
 	atomic_dec(&probe_count);
 	wake_up_all(&probe_waitqueue);
@@ -737,21 +722,7 @@ void wait_for_device_probe(void)
 }
 EXPORT_SYMBOL_GPL(wait_for_device_probe);
 
-/**
- * driver_probe_device - attempt to bind device & driver together
- * @drv: driver to bind a device to
- * @dev: device to try to bind to the driver
- *
- * This function returns -ENODEV if the device is not registered, -EBUSY if it
- * already has a driver, 0 if the device is bound successfully and a positive
- * (inverted) error code for failures from the ->probe method.
- *
- * This function must be called with @dev lock held.  When called for a
- * USB interface, @dev->parent lock must be held as well.
- *
- * If the device has a parent, runtime-resume the parent before driver probing.
- */
-static int driver_probe_device(struct device_driver *drv, struct device *dev)
+static int __driver_probe_device(struct device_driver *drv, struct device *dev)
 {
 	int ret = 0;
 
@@ -782,6 +753,39 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
 	return ret;
 }
 
+/**
+ * driver_probe_device - attempt to bind device & driver together
+ * @drv: driver to bind a device to
+ * @dev: device to try to bind to the driver
+ *
+ * This function returns -ENODEV if the device is not registered, -EBUSY if it
+ * already has a driver, 0 if the device is bound successfully and a positive
+ * (inverted) error code for failures from the ->probe method.
+ *
+ * This function must be called with @dev lock held.  When called for a
+ * USB interface, @dev->parent lock must be held as well.
+ *
+ * If the device has a parent, runtime-resume the parent before driver probing.
+ */
+static int driver_probe_device(struct device_driver *drv, struct device *dev)
+{
+	int trigger_count = atomic_read(&deferred_trigger_count);
+	int ret;
+
+	ret = __driver_probe_device(drv, dev);
+	if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) {
+		driver_deferred_probe_add(dev);
+
+		/*
+		 * Did a trigger occur while probing? Need to re-trigger if yes
+		 */
+		if (trigger_count != atomic_read(&deferred_trigger_count) &&
+		    !defer_all_probes)
+			driver_deferred_probe_trigger();
+	}
+	return ret;
+}
+
 static inline bool cmdline_requested_async_probing(const char *drv_name)
 {
 	return parse_option_str(async_probe_drv_names, drv_name);
@@ -1049,12 +1053,14 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-	ret = driver_probe_device(drv, dev);
+	ret = __driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	/* also return probe errors as normal negative errnos */
 	if (ret > 0)
 		ret = -ret;
+	if (ret == -EPROBE_DEFER)
+		return -EAGAIN;
 	return ret;
 }
 
-- 
2.30.2

Re: [Intel-gfx] [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Jason Gunthorpe]

On Mon, Jun 14, 2021 at 05:08:40PM +0200, Christoph Hellwig wrote:

> @@ -679,8 +666,6 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>  		dev->pm_domain->dismiss(dev);
>  	pm_runtime_reinit(dev);
>  	dev_pm_set_driver_flags(dev, 0);
> -	if (probe_ret == -EPROBE_DEFER)
> -		driver_deferred_probe_add_trigger(dev, local_trigger_count);
>  done:

I like the new arrangement - however I'm looking at the ordering
relative to this:

>  	atomic_dec(&probe_count);
>  	wake_up_all(&probe_waitqueue);

And wondering if the idea is that driver_deferred_probe_add_trigger()
is supposed to be enclosed by the atomic, so that the
device_block_probing() / wait_for_device_probe() sequence is actually
a fence against queuing new work?

Which is suggesting that the other driver_deferred_probe_add_trigger()
at the top of really_probe is already ordered wrong?

Although, if that is the idea the wait_for_device_probe() doesn't look
entirely sequenced right..

It looks easy enough to fix by moving the probe_count up:

> +static int driver_probe_device(struct device_driver *drv, struct device *dev)
> +{
> +	int trigger_count = atomic_read(&deferred_trigger_count);
> +	int ret;
> +
> +	ret = __driver_probe_device(drv, dev);
> +	if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) {
> +		driver_deferred_probe_add(dev);
> +
> +		/*
> +		 * Did a trigger occur while probing? Need to re-trigger if yes
> +		 */
> +		if (trigger_count != atomic_read(&deferred_trigger_count) &&
> +		    !defer_all_probes)
> +			driver_deferred_probe_trigger();
> +	}

into here?

I didn't see a reason why it couldn't enclose the pm stuff too..

Jason
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Re: [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Jason Gunthorpe]

On Mon, Jun 14, 2021 at 05:08:40PM +0200, Christoph Hellwig wrote:

> @@ -679,8 +666,6 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>  		dev->pm_domain->dismiss(dev);
>  	pm_runtime_reinit(dev);
>  	dev_pm_set_driver_flags(dev, 0);
> -	if (probe_ret == -EPROBE_DEFER)
> -		driver_deferred_probe_add_trigger(dev, local_trigger_count);
>  done:

I like the new arrangement - however I'm looking at the ordering
relative to this:

>  	atomic_dec(&probe_count);
>  	wake_up_all(&probe_waitqueue);

And wondering if the idea is that driver_deferred_probe_add_trigger()
is supposed to be enclosed by the atomic, so that the
device_block_probing() / wait_for_device_probe() sequence is actually
a fence against queuing new work?

Which is suggesting that the other driver_deferred_probe_add_trigger()
at the top of really_probe is already ordered wrong?

Although, if that is the idea the wait_for_device_probe() doesn't look
entirely sequenced right..

It looks easy enough to fix by moving the probe_count up:

> +static int driver_probe_device(struct device_driver *drv, struct device *dev)
> +{
> +	int trigger_count = atomic_read(&deferred_trigger_count);
> +	int ret;
> +
> +	ret = __driver_probe_device(drv, dev);
> +	if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) {
> +		driver_deferred_probe_add(dev);
> +
> +		/*
> +		 * Did a trigger occur while probing? Need to re-trigger if yes
> +		 */
> +		if (trigger_count != atomic_read(&deferred_trigger_count) &&
> +		    !defer_all_probes)
> +			driver_deferred_probe_trigger();
> +	}

into here?

I didn't see a reason why it couldn't enclose the pm stuff too..

Jason

Re: [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Jason Gunthorpe]

On Mon, Jun 14, 2021 at 05:08:40PM +0200, Christoph Hellwig wrote:

> @@ -679,8 +666,6 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>  		dev->pm_domain->dismiss(dev);
>  	pm_runtime_reinit(dev);
>  	dev_pm_set_driver_flags(dev, 0);
> -	if (probe_ret == -EPROBE_DEFER)
> -		driver_deferred_probe_add_trigger(dev, local_trigger_count);
>  done:

I like the new arrangement - however I'm looking at the ordering
relative to this:

>  	atomic_dec(&probe_count);
>  	wake_up_all(&probe_waitqueue);

And wondering if the idea is that driver_deferred_probe_add_trigger()
is supposed to be enclosed by the atomic, so that the
device_block_probing() / wait_for_device_probe() sequence is actually
a fence against queuing new work?

Which is suggesting that the other driver_deferred_probe_add_trigger()
at the top of really_probe is already ordered wrong?

Although, if that is the idea the wait_for_device_probe() doesn't look
entirely sequenced right..

It looks easy enough to fix by moving the probe_count up:

> +static int driver_probe_device(struct device_driver *drv, struct device *dev)
> +{
> +	int trigger_count = atomic_read(&deferred_trigger_count);
> +	int ret;
> +
> +	ret = __driver_probe_device(drv, dev);
> +	if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) {
> +		driver_deferred_probe_add(dev);
> +
> +		/*
> +		 * Did a trigger occur while probing? Need to re-trigger if yes
> +		 */
> +		if (trigger_count != atomic_read(&deferred_trigger_count) &&
> +		    !defer_all_probes)
> +			driver_deferred_probe_trigger();
> +	}

into here?

I didn't see a reason why it couldn't enclose the pm stuff too..

Jason

[Intel-gfx] [PATCH 05/10] driver core: Export device_driver_attach()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is intended as a replacement API for device_bind_driver(). It has at
least the following benefits:

- Internal locking. Few of the users of device_bind_driver() follow the
  locking rules

- Calls device driver probe() internally. Notably this means that devm
  support for probe works correctly as probe() error will call
  devres_release_all()

- struct device_driver -> dev_groups is supported

- Simplified calling convention, no need to manually call probe().

The general usage is for situations that already know what driver to bind
and need to ensure the bind is synchronized with other logic. Call
device_driver_attach() after device_add().

If probe() returns a failure then this will be preserved up through to the
error return of device_driver_attach().

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/base.h    | 1 -
 drivers/base/dd.c      | 3 +++
 include/linux/device.h | 2 ++
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/base/base.h b/drivers/base/base.h
index e5f9b7e656c3..404db83ee5ec 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -152,7 +152,6 @@ extern int driver_add_groups(struct device_driver *drv,
 			     const struct attribute_group **groups);
 extern void driver_remove_groups(struct device_driver *drv,
 				 const struct attribute_group **groups);
-int device_driver_attach(struct device_driver *drv, struct device *dev);
 void device_driver_detach(struct device *dev);
 
 extern char *make_class_name(const char *name, struct kobject *kobj);
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 8c65673e344c..aab47c0b356f 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -471,6 +471,8 @@ static void driver_sysfs_remove(struct device *dev)
  * (It is ok to call with no other effort from a driver's probe() method.)
  *
  * This function must be called with the device lock held.
+ *
+ * Callers should prefer to use device_driver_attach() instead.
  */
 int device_bind_driver(struct device *dev)
 {
@@ -1063,6 +1065,7 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 		return -EAGAIN;
 	return ret;
 }
+EXPORT_SYMBOL_GPL(device_driver_attach);
 
 static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie)
 {
diff --git a/include/linux/device.h b/include/linux/device.h
index f1a00040fa53..d8b9c9e7d493 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -845,6 +845,8 @@ static inline void *dev_get_platdata(const struct device *dev)
  * Manual binding of a device to driver. See drivers/base/bus.c
  * for information on use.
  */
+int __must_check device_driver_attach(struct device_driver *drv,
+				      struct device *dev);
 int __must_check device_bind_driver(struct device *dev);
 void device_release_driver(struct device *dev);
 int  __must_check device_attach(struct device *dev);
-- 
2.30.2

_______________________________________________
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https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 05/10] driver core: Export device_driver_attach()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is intended as a replacement API for device_bind_driver(). It has at
least the following benefits:

- Internal locking. Few of the users of device_bind_driver() follow the
  locking rules

- Calls device driver probe() internally. Notably this means that devm
  support for probe works correctly as probe() error will call
  devres_release_all()

- struct device_driver -> dev_groups is supported

- Simplified calling convention, no need to manually call probe().

The general usage is for situations that already know what driver to bind
and need to ensure the bind is synchronized with other logic. Call
device_driver_attach() after device_add().

If probe() returns a failure then this will be preserved up through to the
error return of device_driver_attach().

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/base.h    | 1 -
 drivers/base/dd.c      | 3 +++
 include/linux/device.h | 2 ++
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/base/base.h b/drivers/base/base.h
index e5f9b7e656c3..404db83ee5ec 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -152,7 +152,6 @@ extern int driver_add_groups(struct device_driver *drv,
 			     const struct attribute_group **groups);
 extern void driver_remove_groups(struct device_driver *drv,
 				 const struct attribute_group **groups);
-int device_driver_attach(struct device_driver *drv, struct device *dev);
 void device_driver_detach(struct device *dev);
 
 extern char *make_class_name(const char *name, struct kobject *kobj);
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 8c65673e344c..aab47c0b356f 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -471,6 +471,8 @@ static void driver_sysfs_remove(struct device *dev)
  * (It is ok to call with no other effort from a driver's probe() method.)
  *
  * This function must be called with the device lock held.
+ *
+ * Callers should prefer to use device_driver_attach() instead.
  */
 int device_bind_driver(struct device *dev)
 {
@@ -1063,6 +1065,7 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 		return -EAGAIN;
 	return ret;
 }
+EXPORT_SYMBOL_GPL(device_driver_attach);
 
 static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie)
 {
diff --git a/include/linux/device.h b/include/linux/device.h
index f1a00040fa53..d8b9c9e7d493 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -845,6 +845,8 @@ static inline void *dev_get_platdata(const struct device *dev)
  * Manual binding of a device to driver. See drivers/base/bus.c
  * for information on use.
  */
+int __must_check device_driver_attach(struct device_driver *drv,
+				      struct device *dev);
 int __must_check device_bind_driver(struct device *dev);
 void device_release_driver(struct device *dev);
 int  __must_check device_attach(struct device *dev);
-- 
2.30.2

Re: [Intel-gfx] [PATCH 05/10] driver core: Export device_driver_attach()

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:41PM +0200, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@nvidia.com>
> 
> This is intended as a replacement API for device_bind_driver(). It has at
> least the following benefits:
> 
> - Internal locking. Few of the users of device_bind_driver() follow the
>   locking rules
> 
> - Calls device driver probe() internally. Notably this means that devm
>   support for probe works correctly as probe() error will call
>   devres_release_all()
> 
> - struct device_driver -> dev_groups is supported
> 
> - Simplified calling convention, no need to manually call probe().
> 
> The general usage is for situations that already know what driver to bind
> and need to ensure the bind is synchronized with other logic. Call
> device_driver_attach() after device_add().
> 
> If probe() returns a failure then this will be preserved up through to the
> error return of device_driver_attach().
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
_______________________________________________
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Re: [PATCH 05/10] driver core: Export device_driver_attach()

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:41PM +0200, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@nvidia.com>
> 
> This is intended as a replacement API for device_bind_driver(). It has at
> least the following benefits:
> 
> - Internal locking. Few of the users of device_bind_driver() follow the
>   locking rules
> 
> - Calls device driver probe() internally. Notably this means that devm
>   support for probe works correctly as probe() error will call
>   devres_release_all()
> 
> - struct device_driver -> dev_groups is supported
> 
> - Simplified calling convention, no need to manually call probe().
> 
> The general usage is for situations that already know what driver to bind
> and need to ensure the bind is synchronized with other logic. Call
> device_driver_attach() after device_add().
> 
> If probe() returns a failure then this will be preserved up through to the
> error return of device_driver_attach().
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH 05/10] driver core: Export device_driver_attach()

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:41PM +0200, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@nvidia.com>
> 
> This is intended as a replacement API for device_bind_driver(). It has at
> least the following benefits:
> 
> - Internal locking. Few of the users of device_bind_driver() follow the
>   locking rules
> 
> - Calls device driver probe() internally. Notably this means that devm
>   support for probe works correctly as probe() error will call
>   devres_release_all()
> 
> - struct device_driver -> dev_groups is supported
> 
> - Simplified calling convention, no need to manually call probe().
> 
> The general usage is for situations that already know what driver to bind
> and need to ensure the bind is synchronized with other logic. Call
> device_driver_attach() after device_add().
> 
> If probe() returns a failure then this will be preserved up through to the
> error return of device_driver_attach().
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [Intel-gfx] [PATCH 05/10] driver core: Export device_driver_attach()

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> This is intended as a replacement API for device_bind_driver(). It has at
> least the following benefits:
>
> - Internal locking. Few of the users of device_bind_driver() follow the
>   locking rules
>
> - Calls device driver probe() internally. Notably this means that devm
>   support for probe works correctly as probe() error will call
>   devres_release_all()
>
> - struct device_driver -> dev_groups is supported
>
> - Simplified calling convention, no need to manually call probe().
>
> The general usage is for situations that already know what driver to bind
> and need to ensure the bind is synchronized with other logic. Call
> device_driver_attach() after device_add().
>
> If probe() returns a failure then this will be preserved up through to the
> error return of device_driver_attach().
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/base.h    | 1 -
>  drivers/base/dd.c      | 3 +++
>  include/linux/device.h | 2 ++
>  3 files changed, 5 insertions(+), 1 deletion(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 05/10] driver core: Export device_driver_attach()

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> This is intended as a replacement API for device_bind_driver(). It has at
> least the following benefits:
>
> - Internal locking. Few of the users of device_bind_driver() follow the
>   locking rules
>
> - Calls device driver probe() internally. Notably this means that devm
>   support for probe works correctly as probe() error will call
>   devres_release_all()
>
> - struct device_driver -> dev_groups is supported
>
> - Simplified calling convention, no need to manually call probe().
>
> The general usage is for situations that already know what driver to bind
> and need to ensure the bind is synchronized with other logic. Call
> device_driver_attach() after device_add().
>
> If probe() returns a failure then this will be preserved up through to the
> error return of device_driver_attach().
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/base.h    | 1 -
>  drivers/base/dd.c      | 3 +++
>  include/linux/device.h | 2 ++
>  3 files changed, 5 insertions(+), 1 deletion(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

Re: [PATCH 05/10] driver core: Export device_driver_attach()

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> This is intended as a replacement API for device_bind_driver(). It has at
> least the following benefits:
>
> - Internal locking. Few of the users of device_bind_driver() follow the
>   locking rules
>
> - Calls device driver probe() internally. Notably this means that devm
>   support for probe works correctly as probe() error will call
>   devres_release_all()
>
> - struct device_driver -> dev_groups is supported
>
> - Simplified calling convention, no need to manually call probe().
>
> The general usage is for situations that already know what driver to bind
> and need to ensure the bind is synchronized with other logic. Call
> device_driver_attach() after device_add().
>
> If probe() returns a failure then this will be preserved up through to the
> error return of device_driver_attach().
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/base/base.h    | 1 -
>  drivers/base/dd.c      | 3 +++
>  include/linux/device.h | 2 ++
>  3 files changed, 5 insertions(+), 1 deletion(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

[Intel-gfx] [PATCH 06/10] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

For some reason the vfio_mdev shim mdev_driver has its own module and
kconfig. As the next patch requires access to it from mdev.ko merge the
two modules together and remove VFIO_MDEV_DEVICE.

A later patch deletes this driver entirely.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 Documentation/s390/vfio-ap.rst   |  1 -
 arch/s390/Kconfig                |  2 +-
 drivers/gpu/drm/i915/Kconfig     |  2 +-
 drivers/vfio/mdev/Kconfig        |  7 -------
 drivers/vfio/mdev/Makefile       |  3 +--
 drivers/vfio/mdev/mdev_core.c    | 16 ++++++++++++++--
 drivers/vfio/mdev/mdev_private.h |  2 ++
 drivers/vfio/mdev/vfio_mdev.c    | 24 +-----------------------
 samples/Kconfig                  |  6 +++---
 9 files changed, 23 insertions(+), 40 deletions(-)

diff --git a/Documentation/s390/vfio-ap.rst b/Documentation/s390/vfio-ap.rst
index e15436599086..f57ae621f33e 100644
--- a/Documentation/s390/vfio-ap.rst
+++ b/Documentation/s390/vfio-ap.rst
@@ -514,7 +514,6 @@ These are the steps:
    * S390_AP_IOMMU
    * VFIO
    * VFIO_MDEV
-   * VFIO_MDEV_DEVICE
    * KVM
 
    If using make menuconfig select the following to build the vfio_ap module::
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b4c7c34069f8..ea63fd22e119 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -768,7 +768,7 @@ config VFIO_CCW
 config VFIO_AP
 	def_tristate n
 	prompt "VFIO support for AP devices"
-	depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
+	depends on S390_AP_IOMMU && VFIO_MDEV && KVM
 	depends on ZCRYPT
 	help
 		This driver grants access to Adjunct Processor (AP) devices
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 1e1cb245fca7..53bc68631861 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -124,7 +124,7 @@ config DRM_I915_GVT_KVMGT
 	tristate "Enable KVM/VFIO support for Intel GVT-g"
 	depends on DRM_I915_GVT
 	depends on KVM
-	depends on VFIO_MDEV && VFIO_MDEV_DEVICE
+	depends on VFIO_MDEV
 	default n
 	help
 	  Choose this option if you want to enable KVMGT support for
diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
index 5da27f2100f9..763c877a1318 100644
--- a/drivers/vfio/mdev/Kconfig
+++ b/drivers/vfio/mdev/Kconfig
@@ -9,10 +9,3 @@ config VFIO_MDEV
 	  See Documentation/driver-api/vfio-mediated-device.rst for more details.
 
 	  If you don't know what do here, say N.
-
-config VFIO_MDEV_DEVICE
-	tristate "VFIO driver for Mediated devices"
-	depends on VFIO && VFIO_MDEV
-	default n
-	help
-	  VFIO based driver for Mediated devices.
diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
index 101516fdf375..ff9ecd802125 100644
--- a/drivers/vfio/mdev/Makefile
+++ b/drivers/vfio/mdev/Makefile
@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o
+mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o vfio_mdev.o
 
 obj-$(CONFIG_VFIO_MDEV) += mdev.o
-obj-$(CONFIG_VFIO_MDEV_DEVICE) += vfio_mdev.o
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 2a85d6fcb7dd..ff8c1a845166 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -360,11 +360,24 @@ int mdev_device_remove(struct mdev_device *mdev)
 
 static int __init mdev_init(void)
 {
-	return mdev_bus_register();
+	int rc;
+
+	rc = mdev_bus_register();
+	if (rc)
+		return rc;
+	rc = mdev_register_driver(&vfio_mdev_driver);
+	if (rc)
+		goto err_bus;
+	return 0;
+err_bus:
+	mdev_bus_unregister();
+	return rc;
 }
 
 static void __exit mdev_exit(void)
 {
+	mdev_unregister_driver(&vfio_mdev_driver);
+
 	if (mdev_bus_compat_class)
 		class_compat_unregister(mdev_bus_compat_class);
 
@@ -378,4 +391,3 @@ MODULE_VERSION(DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_SOFTDEP("post: vfio_mdev");
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index 6999c89db7b1..afbad7b0a14a 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -37,6 +37,8 @@ struct mdev_type {
 #define to_mdev_type(_kobj)		\
 	container_of(_kobj, struct mdev_type, kobj)
 
+extern struct mdev_driver vfio_mdev_driver;
+
 int  parent_create_sysfs_files(struct mdev_parent *parent);
 void parent_remove_sysfs_files(struct mdev_parent *parent);
 
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index 922729071c5a..d5b4eede47c1 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -17,10 +17,6 @@
 
 #include "mdev_private.h"
 
-#define DRIVER_VERSION  "0.1"
-#define DRIVER_AUTHOR   "NVIDIA Corporation"
-#define DRIVER_DESC     "VFIO based driver for Mediated device"
-
 static int vfio_mdev_open(struct vfio_device *core_vdev)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
@@ -151,7 +147,7 @@ static void vfio_mdev_remove(struct mdev_device *mdev)
 	kfree(vdev);
 }
 
-static struct mdev_driver vfio_mdev_driver = {
+struct mdev_driver vfio_mdev_driver = {
 	.driver = {
 		.name = "vfio_mdev",
 		.owner = THIS_MODULE,
@@ -160,21 +156,3 @@ static struct mdev_driver vfio_mdev_driver = {
 	.probe	= vfio_mdev_probe,
 	.remove	= vfio_mdev_remove,
 };
-
-static int __init vfio_mdev_init(void)
-{
-	return mdev_register_driver(&vfio_mdev_driver);
-}
-
-static void __exit vfio_mdev_exit(void)
-{
-	mdev_unregister_driver(&vfio_mdev_driver);
-}
-
-module_init(vfio_mdev_init)
-module_exit(vfio_mdev_exit)
-
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/samples/Kconfig b/samples/Kconfig
index b5a1a7aa7e23..b0503ef058d3 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -154,14 +154,14 @@ config SAMPLE_UHID
 
 config SAMPLE_VFIO_MDEV_MTTY
 	tristate "Build VFIO mtty example mediated device sample code -- loadable modules only"
-	depends on VFIO_MDEV_DEVICE && m
+	depends on VFIO_MDEV && m
 	help
 	  Build a virtual tty sample driver for use as a VFIO
 	  mediated device
 
 config SAMPLE_VFIO_MDEV_MDPY
 	tristate "Build VFIO mdpy example mediated device sample code -- loadable modules only"
-	depends on VFIO_MDEV_DEVICE && m
+	depends on VFIO_MDEV && m
 	help
 	  Build a virtual display sample driver for use as a VFIO
 	  mediated device.  It is a simple framebuffer and supports
@@ -178,7 +178,7 @@ config SAMPLE_VFIO_MDEV_MDPY_FB
 
 config SAMPLE_VFIO_MDEV_MBOCHS
 	tristate "Build VFIO mdpy example mediated device sample code -- loadable modules only"
-	depends on VFIO_MDEV_DEVICE && m
+	depends on VFIO_MDEV && m
 	select DMA_SHARED_BUFFER
 	help
 	  Build a virtual display sample driver for use as a VFIO
-- 
2.30.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 06/10] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

For some reason the vfio_mdev shim mdev_driver has its own module and
kconfig. As the next patch requires access to it from mdev.ko merge the
two modules together and remove VFIO_MDEV_DEVICE.

A later patch deletes this driver entirely.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 Documentation/s390/vfio-ap.rst   |  1 -
 arch/s390/Kconfig                |  2 +-
 drivers/gpu/drm/i915/Kconfig     |  2 +-
 drivers/vfio/mdev/Kconfig        |  7 -------
 drivers/vfio/mdev/Makefile       |  3 +--
 drivers/vfio/mdev/mdev_core.c    | 16 ++++++++++++++--
 drivers/vfio/mdev/mdev_private.h |  2 ++
 drivers/vfio/mdev/vfio_mdev.c    | 24 +-----------------------
 samples/Kconfig                  |  6 +++---
 9 files changed, 23 insertions(+), 40 deletions(-)

diff --git a/Documentation/s390/vfio-ap.rst b/Documentation/s390/vfio-ap.rst
index e15436599086..f57ae621f33e 100644
--- a/Documentation/s390/vfio-ap.rst
+++ b/Documentation/s390/vfio-ap.rst
@@ -514,7 +514,6 @@ These are the steps:
    * S390_AP_IOMMU
    * VFIO
    * VFIO_MDEV
-   * VFIO_MDEV_DEVICE
    * KVM
 
    If using make menuconfig select the following to build the vfio_ap module::
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b4c7c34069f8..ea63fd22e119 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -768,7 +768,7 @@ config VFIO_CCW
 config VFIO_AP
 	def_tristate n
 	prompt "VFIO support for AP devices"
-	depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
+	depends on S390_AP_IOMMU && VFIO_MDEV && KVM
 	depends on ZCRYPT
 	help
 		This driver grants access to Adjunct Processor (AP) devices
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 1e1cb245fca7..53bc68631861 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -124,7 +124,7 @@ config DRM_I915_GVT_KVMGT
 	tristate "Enable KVM/VFIO support for Intel GVT-g"
 	depends on DRM_I915_GVT
 	depends on KVM
-	depends on VFIO_MDEV && VFIO_MDEV_DEVICE
+	depends on VFIO_MDEV
 	default n
 	help
 	  Choose this option if you want to enable KVMGT support for
diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
index 5da27f2100f9..763c877a1318 100644
--- a/drivers/vfio/mdev/Kconfig
+++ b/drivers/vfio/mdev/Kconfig
@@ -9,10 +9,3 @@ config VFIO_MDEV
 	  See Documentation/driver-api/vfio-mediated-device.rst for more details.
 
 	  If you don't know what do here, say N.
-
-config VFIO_MDEV_DEVICE
-	tristate "VFIO driver for Mediated devices"
-	depends on VFIO && VFIO_MDEV
-	default n
-	help
-	  VFIO based driver for Mediated devices.
diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
index 101516fdf375..ff9ecd802125 100644
--- a/drivers/vfio/mdev/Makefile
+++ b/drivers/vfio/mdev/Makefile
@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o
+mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o vfio_mdev.o
 
 obj-$(CONFIG_VFIO_MDEV) += mdev.o
-obj-$(CONFIG_VFIO_MDEV_DEVICE) += vfio_mdev.o
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 2a85d6fcb7dd..ff8c1a845166 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -360,11 +360,24 @@ int mdev_device_remove(struct mdev_device *mdev)
 
 static int __init mdev_init(void)
 {
-	return mdev_bus_register();
+	int rc;
+
+	rc = mdev_bus_register();
+	if (rc)
+		return rc;
+	rc = mdev_register_driver(&vfio_mdev_driver);
+	if (rc)
+		goto err_bus;
+	return 0;
+err_bus:
+	mdev_bus_unregister();
+	return rc;
 }
 
 static void __exit mdev_exit(void)
 {
+	mdev_unregister_driver(&vfio_mdev_driver);
+
 	if (mdev_bus_compat_class)
 		class_compat_unregister(mdev_bus_compat_class);
 
@@ -378,4 +391,3 @@ MODULE_VERSION(DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_SOFTDEP("post: vfio_mdev");
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index 6999c89db7b1..afbad7b0a14a 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -37,6 +37,8 @@ struct mdev_type {
 #define to_mdev_type(_kobj)		\
 	container_of(_kobj, struct mdev_type, kobj)
 
+extern struct mdev_driver vfio_mdev_driver;
+
 int  parent_create_sysfs_files(struct mdev_parent *parent);
 void parent_remove_sysfs_files(struct mdev_parent *parent);
 
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index 922729071c5a..d5b4eede47c1 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -17,10 +17,6 @@
 
 #include "mdev_private.h"
 
-#define DRIVER_VERSION  "0.1"
-#define DRIVER_AUTHOR   "NVIDIA Corporation"
-#define DRIVER_DESC     "VFIO based driver for Mediated device"
-
 static int vfio_mdev_open(struct vfio_device *core_vdev)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
@@ -151,7 +147,7 @@ static void vfio_mdev_remove(struct mdev_device *mdev)
 	kfree(vdev);
 }
 
-static struct mdev_driver vfio_mdev_driver = {
+struct mdev_driver vfio_mdev_driver = {
 	.driver = {
 		.name = "vfio_mdev",
 		.owner = THIS_MODULE,
@@ -160,21 +156,3 @@ static struct mdev_driver vfio_mdev_driver = {
 	.probe	= vfio_mdev_probe,
 	.remove	= vfio_mdev_remove,
 };
-
-static int __init vfio_mdev_init(void)
-{
-	return mdev_register_driver(&vfio_mdev_driver);
-}
-
-static void __exit vfio_mdev_exit(void)
-{
-	mdev_unregister_driver(&vfio_mdev_driver);
-}
-
-module_init(vfio_mdev_init)
-module_exit(vfio_mdev_exit)
-
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/samples/Kconfig b/samples/Kconfig
index b5a1a7aa7e23..b0503ef058d3 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -154,14 +154,14 @@ config SAMPLE_UHID
 
 config SAMPLE_VFIO_MDEV_MTTY
 	tristate "Build VFIO mtty example mediated device sample code -- loadable modules only"
-	depends on VFIO_MDEV_DEVICE && m
+	depends on VFIO_MDEV && m
 	help
 	  Build a virtual tty sample driver for use as a VFIO
 	  mediated device
 
 config SAMPLE_VFIO_MDEV_MDPY
 	tristate "Build VFIO mdpy example mediated device sample code -- loadable modules only"
-	depends on VFIO_MDEV_DEVICE && m
+	depends on VFIO_MDEV && m
 	help
 	  Build a virtual display sample driver for use as a VFIO
 	  mediated device.  It is a simple framebuffer and supports
@@ -178,7 +178,7 @@ config SAMPLE_VFIO_MDEV_MDPY_FB
 
 config SAMPLE_VFIO_MDEV_MBOCHS
 	tristate "Build VFIO mdpy example mediated device sample code -- loadable modules only"
-	depends on VFIO_MDEV_DEVICE && m
+	depends on VFIO_MDEV && m
 	select DMA_SHARED_BUFFER
 	help
 	  Build a virtual display sample driver for use as a VFIO
-- 
2.30.2

Re: [Intel-gfx] [PATCH 06/10] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> For some reason the vfio_mdev shim mdev_driver has its own module and
> kconfig. As the next patch requires access to it from mdev.ko merge the
> two modules together and remove VFIO_MDEV_DEVICE.
>
> A later patch deletes this driver entirely.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  Documentation/s390/vfio-ap.rst   |  1 -
>  arch/s390/Kconfig                |  2 +-
>  drivers/gpu/drm/i915/Kconfig     |  2 +-
>  drivers/vfio/mdev/Kconfig        |  7 -------
>  drivers/vfio/mdev/Makefile       |  3 +--
>  drivers/vfio/mdev/mdev_core.c    | 16 ++++++++++++++--
>  drivers/vfio/mdev/mdev_private.h |  2 ++
>  drivers/vfio/mdev/vfio_mdev.c    | 24 +-----------------------
>  samples/Kconfig                  |  6 +++---
>  9 files changed, 23 insertions(+), 40 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 06/10] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> For some reason the vfio_mdev shim mdev_driver has its own module and
> kconfig. As the next patch requires access to it from mdev.ko merge the
> two modules together and remove VFIO_MDEV_DEVICE.
>
> A later patch deletes this driver entirely.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  Documentation/s390/vfio-ap.rst   |  1 -
>  arch/s390/Kconfig                |  2 +-
>  drivers/gpu/drm/i915/Kconfig     |  2 +-
>  drivers/vfio/mdev/Kconfig        |  7 -------
>  drivers/vfio/mdev/Makefile       |  3 +--
>  drivers/vfio/mdev/mdev_core.c    | 16 ++++++++++++++--
>  drivers/vfio/mdev/mdev_private.h |  2 ++
>  drivers/vfio/mdev/vfio_mdev.c    | 24 +-----------------------
>  samples/Kconfig                  |  6 +++---
>  9 files changed, 23 insertions(+), 40 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

Re: [PATCH 06/10] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> For some reason the vfio_mdev shim mdev_driver has its own module and
> kconfig. As the next patch requires access to it from mdev.ko merge the
> two modules together and remove VFIO_MDEV_DEVICE.
>
> A later patch deletes this driver entirely.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  Documentation/s390/vfio-ap.rst   |  1 -
>  arch/s390/Kconfig                |  2 +-
>  drivers/gpu/drm/i915/Kconfig     |  2 +-
>  drivers/vfio/mdev/Kconfig        |  7 -------
>  drivers/vfio/mdev/Makefile       |  3 +--
>  drivers/vfio/mdev/mdev_core.c    | 16 ++++++++++++++--
>  drivers/vfio/mdev/mdev_private.h |  2 ++
>  drivers/vfio/mdev/vfio_mdev.c    | 24 +-----------------------
>  samples/Kconfig                  |  6 +++---
>  9 files changed, 23 insertions(+), 40 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

[Intel-gfx] [PATCH 07/10] vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This allows a mdev driver to opt out of using vfio_mdev.c, instead the
driver will provide a 'struct mdev_driver' and register directly with the
driver core.

Much of mdev_parent_ops becomes unused in this mode:
- create()/remove() are done via the mdev_driver probe()/remove()
- mdev_attr_groups becomes mdev_driver driver.dev_groups
- Wrapper function callbacks are replaced with the same ones from
  struct vfio_device_ops

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/vfio/mdev/mdev_core.c   | 30 ++++++++++++++++++++++--------
 drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++
 include/linux/mdev.h            |  2 ++
 3 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index ff8c1a845166..e4581ec093a6 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -94,9 +94,11 @@ static void mdev_device_remove_common(struct mdev_device *mdev)
 	mdev_remove_sysfs_files(mdev);
 	device_del(&mdev->dev);
 	lockdep_assert_held(&parent->unreg_sem);
-	ret = parent->ops->remove(mdev);
-	if (ret)
-		dev_err(&mdev->dev, "Remove failed: err=%d\n", ret);
+	if (parent->ops->remove) {
+		ret = parent->ops->remove(mdev);
+		if (ret)
+			dev_err(&mdev->dev, "Remove failed: err=%d\n", ret);
+	}
 
 	/* Balances with device_initialize() */
 	put_device(&mdev->dev);
@@ -127,7 +129,9 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
 	char *envp[] = { env_string, NULL };
 
 	/* check for mandatory ops */
-	if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups)
+	if (!ops || !ops->supported_type_groups)
+		return -EINVAL;
+	if (!ops->device_driver && (!ops->create || !ops->remove))
 		return -EINVAL;
 
 	dev = get_device(dev);
@@ -256,6 +260,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 	int ret;
 	struct mdev_device *mdev, *tmp;
 	struct mdev_parent *parent = type->parent;
+	struct mdev_driver *drv = parent->ops->device_driver;
 
 	mutex_lock(&mdev_list_lock);
 
@@ -296,14 +301,22 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 		goto out_put_device;
 	}
 
-	ret = parent->ops->create(mdev);
-	if (ret)
-		goto out_unlock;
+	if (parent->ops->create) {
+		ret = parent->ops->create(mdev);
+		if (ret)
+			goto out_unlock;
+	}
 
 	ret = device_add(&mdev->dev);
 	if (ret)
 		goto out_remove;
 
+	if (!drv)
+		drv = &vfio_mdev_driver;
+	ret = device_driver_attach(&drv->driver, &mdev->dev);
+	if (ret)
+		goto out_del;
+
 	ret = mdev_create_sysfs_files(mdev);
 	if (ret)
 		goto out_del;
@@ -317,7 +330,8 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 out_del:
 	device_del(&mdev->dev);
 out_remove:
-	parent->ops->remove(mdev);
+	if (parent->ops->remove)
+		parent->ops->remove(mdev);
 out_unlock:
 	up_read(&parent->unreg_sem);
 out_put_device:
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
index 041699571b7e..c368ec824e2b 100644
--- a/drivers/vfio/mdev/mdev_driver.c
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -71,10 +71,20 @@ static int mdev_remove(struct device *dev)
 	return 0;
 }
 
+static int mdev_match(struct device *dev, struct device_driver *drv)
+{
+	/*
+	 * No drivers automatically match. Drivers are only bound by explicit
+	 * device_driver_attach()
+	 */
+	return 0;
+}
+
 struct bus_type mdev_bus_type = {
 	.name		= "mdev",
 	.probe		= mdev_probe,
 	.remove		= mdev_remove,
+	.match		= mdev_match,
 };
 EXPORT_SYMBOL_GPL(mdev_bus_type);
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 1fb34ea394ad..3a38598c2605 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -55,6 +55,7 @@ struct device *mtype_get_parent_dev(struct mdev_type *mtype);
  * register the device to mdev module.
  *
  * @owner:		The module owner.
+ * @device_driver:	Which device driver to probe() on newly created devices
  * @dev_attr_groups:	Attributes of the parent device.
  * @mdev_attr_groups:	Attributes of the mediated device.
  * @supported_type_groups: Attributes to define supported types. It is mandatory
@@ -103,6 +104,7 @@ struct device *mtype_get_parent_dev(struct mdev_type *mtype);
  **/
 struct mdev_parent_ops {
 	struct module   *owner;
+	struct mdev_driver *device_driver;
 	const struct attribute_group **dev_attr_groups;
 	const struct attribute_group **mdev_attr_groups;
 	struct attribute_group **supported_type_groups;
-- 
2.30.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 07/10] vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This allows a mdev driver to opt out of using vfio_mdev.c, instead the
driver will provide a 'struct mdev_driver' and register directly with the
driver core.

Much of mdev_parent_ops becomes unused in this mode:
- create()/remove() are done via the mdev_driver probe()/remove()
- mdev_attr_groups becomes mdev_driver driver.dev_groups
- Wrapper function callbacks are replaced with the same ones from
  struct vfio_device_ops

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/vfio/mdev/mdev_core.c   | 30 ++++++++++++++++++++++--------
 drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++
 include/linux/mdev.h            |  2 ++
 3 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index ff8c1a845166..e4581ec093a6 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -94,9 +94,11 @@ static void mdev_device_remove_common(struct mdev_device *mdev)
 	mdev_remove_sysfs_files(mdev);
 	device_del(&mdev->dev);
 	lockdep_assert_held(&parent->unreg_sem);
-	ret = parent->ops->remove(mdev);
-	if (ret)
-		dev_err(&mdev->dev, "Remove failed: err=%d\n", ret);
+	if (parent->ops->remove) {
+		ret = parent->ops->remove(mdev);
+		if (ret)
+			dev_err(&mdev->dev, "Remove failed: err=%d\n", ret);
+	}
 
 	/* Balances with device_initialize() */
 	put_device(&mdev->dev);
@@ -127,7 +129,9 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
 	char *envp[] = { env_string, NULL };
 
 	/* check for mandatory ops */
-	if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups)
+	if (!ops || !ops->supported_type_groups)
+		return -EINVAL;
+	if (!ops->device_driver && (!ops->create || !ops->remove))
 		return -EINVAL;
 
 	dev = get_device(dev);
@@ -256,6 +260,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 	int ret;
 	struct mdev_device *mdev, *tmp;
 	struct mdev_parent *parent = type->parent;
+	struct mdev_driver *drv = parent->ops->device_driver;
 
 	mutex_lock(&mdev_list_lock);
 
@@ -296,14 +301,22 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 		goto out_put_device;
 	}
 
-	ret = parent->ops->create(mdev);
-	if (ret)
-		goto out_unlock;
+	if (parent->ops->create) {
+		ret = parent->ops->create(mdev);
+		if (ret)
+			goto out_unlock;
+	}
 
 	ret = device_add(&mdev->dev);
 	if (ret)
 		goto out_remove;
 
+	if (!drv)
+		drv = &vfio_mdev_driver;
+	ret = device_driver_attach(&drv->driver, &mdev->dev);
+	if (ret)
+		goto out_del;
+
 	ret = mdev_create_sysfs_files(mdev);
 	if (ret)
 		goto out_del;
@@ -317,7 +330,8 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 out_del:
 	device_del(&mdev->dev);
 out_remove:
-	parent->ops->remove(mdev);
+	if (parent->ops->remove)
+		parent->ops->remove(mdev);
 out_unlock:
 	up_read(&parent->unreg_sem);
 out_put_device:
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
index 041699571b7e..c368ec824e2b 100644
--- a/drivers/vfio/mdev/mdev_driver.c
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -71,10 +71,20 @@ static int mdev_remove(struct device *dev)
 	return 0;
 }
 
+static int mdev_match(struct device *dev, struct device_driver *drv)
+{
+	/*
+	 * No drivers automatically match. Drivers are only bound by explicit
+	 * device_driver_attach()
+	 */
+	return 0;
+}
+
 struct bus_type mdev_bus_type = {
 	.name		= "mdev",
 	.probe		= mdev_probe,
 	.remove		= mdev_remove,
+	.match		= mdev_match,
 };
 EXPORT_SYMBOL_GPL(mdev_bus_type);
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 1fb34ea394ad..3a38598c2605 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -55,6 +55,7 @@ struct device *mtype_get_parent_dev(struct mdev_type *mtype);
  * register the device to mdev module.
  *
  * @owner:		The module owner.
+ * @device_driver:	Which device driver to probe() on newly created devices
  * @dev_attr_groups:	Attributes of the parent device.
  * @mdev_attr_groups:	Attributes of the mediated device.
  * @supported_type_groups: Attributes to define supported types. It is mandatory
@@ -103,6 +104,7 @@ struct device *mtype_get_parent_dev(struct mdev_type *mtype);
  **/
 struct mdev_parent_ops {
 	struct module   *owner;
+	struct mdev_driver *device_driver;
 	const struct attribute_group **dev_attr_groups;
 	const struct attribute_group **mdev_attr_groups;
 	struct attribute_group **supported_type_groups;
-- 
2.30.2

Re: [Intel-gfx] [PATCH 07/10] vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> This allows a mdev driver to opt out of using vfio_mdev.c, instead the
> driver will provide a 'struct mdev_driver' and register directly with the
> driver core.
>
> Much of mdev_parent_ops becomes unused in this mode:
> - create()/remove() are done via the mdev_driver probe()/remove()
> - mdev_attr_groups becomes mdev_driver driver.dev_groups
> - Wrapper function callbacks are replaced with the same ones from
>   struct vfio_device_ops
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/vfio/mdev/mdev_core.c   | 30 ++++++++++++++++++++++--------
>  drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++
>  include/linux/mdev.h            |  2 ++
>  3 files changed, 34 insertions(+), 8 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 07/10] vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> This allows a mdev driver to opt out of using vfio_mdev.c, instead the
> driver will provide a 'struct mdev_driver' and register directly with the
> driver core.
>
> Much of mdev_parent_ops becomes unused in this mode:
> - create()/remove() are done via the mdev_driver probe()/remove()
> - mdev_attr_groups becomes mdev_driver driver.dev_groups
> - Wrapper function callbacks are replaced with the same ones from
>   struct vfio_device_ops
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/vfio/mdev/mdev_core.c   | 30 ++++++++++++++++++++++--------
>  drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++
>  include/linux/mdev.h            |  2 ++
>  3 files changed, 34 insertions(+), 8 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

Re: [PATCH 07/10] vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind

[Cornelia Huck]

On Mon, Jun 14 2021, Christoph Hellwig <hch@lst.de> wrote:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> This allows a mdev driver to opt out of using vfio_mdev.c, instead the
> driver will provide a 'struct mdev_driver' and register directly with the
> driver core.
>
> Much of mdev_parent_ops becomes unused in this mode:
> - create()/remove() are done via the mdev_driver probe()/remove()
> - mdev_attr_groups becomes mdev_driver driver.dev_groups
> - Wrapper function callbacks are replaced with the same ones from
>   struct vfio_device_ops
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/vfio/mdev/mdev_core.c   | 30 ++++++++++++++++++++++--------
>  drivers/vfio/mdev/mdev_driver.c | 10 ++++++++++
>  include/linux/mdev.h            |  2 ++
>  3 files changed, 34 insertions(+), 8 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

[Intel-gfx] [PATCH 08/10] vfio/mtty: Convert to use vfio_register_group_dev()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is straightforward conversion, the mdev_state is actually serving as
the vfio_device and we can replace all the mdev_get_drvdata()'s and the
wonky dead code with a simple container_of()

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 samples/vfio-mdev/mtty.c | 185 ++++++++++++++++++---------------------
 1 file changed, 83 insertions(+), 102 deletions(-)

diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index b9b24be4abda..d2a168420b77 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -127,6 +127,7 @@ struct serial_port {
 
 /* State of each mdev device */
 struct mdev_state {
+	struct vfio_device vdev;
 	int irq_fd;
 	struct eventfd_ctx *intx_evtfd;
 	struct eventfd_ctx *msi_evtfd;
@@ -150,6 +151,8 @@ static const struct file_operations vd_fops = {
 	.owner          = THIS_MODULE,
 };
 
+static const struct vfio_device_ops mtty_dev_ops;
+
 /* function prototypes */
 
 static int mtty_trigger_interrupt(struct mdev_state *mdev_state);
@@ -631,22 +634,15 @@ static void mdev_read_base(struct mdev_state *mdev_state)
 	}
 }
 
-static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
+static ssize_t mdev_access(struct mdev_state *mdev_state, u8 *buf, size_t count,
 			   loff_t pos, bool is_write)
 {
-	struct mdev_state *mdev_state;
 	unsigned int index;
 	loff_t offset;
 	int ret = 0;
 
-	if (!mdev || !buf)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state) {
-		pr_err("%s mdev_state not found\n", __func__);
+	if (!buf)
 		return -EINVAL;
-	}
 
 	mutex_lock(&mdev_state->ops_lock);
 
@@ -708,15 +704,18 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
 	return ret;
 }
 
-static int mtty_create(struct mdev_device *mdev)
+static int mtty_probe(struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state;
 	int nr_ports = mdev_get_type_group_id(mdev) + 1;
+	int ret;
 
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
 		return -ENOMEM;
 
+	vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mtty_dev_ops);
+
 	mdev_state->nr_ports = nr_ports;
 	mdev_state->irq_index = -1;
 	mdev_state->s[0].max_fifo_size = MAX_FIFO_SIZE;
@@ -731,7 +730,6 @@ static int mtty_create(struct mdev_device *mdev)
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
-	mdev_set_drvdata(mdev, mdev_state);
 
 	mtty_create_config_space(mdev_state);
 
@@ -739,50 +737,40 @@ static int mtty_create(struct mdev_device *mdev)
 	list_add(&mdev_state->next, &mdev_devices_list);
 	mutex_unlock(&mdev_list_lock);
 
+	ret = vfio_register_group_dev(&mdev_state->vdev);
+	if (ret) {
+		kfree(mdev_state);
+		return ret;
+	}
+	dev_set_drvdata(&mdev->dev, mdev_state);
 	return 0;
 }
 
-static int mtty_remove(struct mdev_device *mdev)
+static void mtty_remove(struct mdev_device *mdev)
 {
-	struct mdev_state *mds, *tmp_mds;
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	int ret = -EINVAL;
+	struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 
+	vfio_unregister_group_dev(&mdev_state->vdev);
 	mutex_lock(&mdev_list_lock);
-	list_for_each_entry_safe(mds, tmp_mds, &mdev_devices_list, next) {
-		if (mdev_state == mds) {
-			list_del(&mdev_state->next);
-			mdev_set_drvdata(mdev, NULL);
-			kfree(mdev_state->vconfig);
-			kfree(mdev_state);
-			ret = 0;
-			break;
-		}
-	}
+	list_del(&mdev_state->next);
 	mutex_unlock(&mdev_list_lock);
 
-	return ret;
+	kfree(mdev_state->vconfig);
+	kfree(mdev_state);
 }
 
-static int mtty_reset(struct mdev_device *mdev)
+static int mtty_reset(struct mdev_state *mdev_stte)
 {
-	struct mdev_state *mdev_state;
-
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
-
 	pr_info("%s: called\n", __func__);
 
 	return 0;
 }
 
-static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
+static ssize_t mtty_read(struct vfio_device *vdev, char __user *buf,
 			 size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -792,7 +780,7 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 		if (count >= 4 && !(*ppos % 4)) {
 			u32 val;
 
-			ret =  mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret =  mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					   *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -804,7 +792,7 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 		} else if (count >= 2 && !(*ppos % 2)) {
 			u16 val;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -816,7 +804,7 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 		} else {
 			u8 val;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -839,9 +827,11 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 	return -EFAULT;
 }
 
-static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
+static ssize_t mtty_write(struct vfio_device *vdev, const char __user *buf,
 		   size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -854,7 +844,7 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -866,7 +856,7 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -878,7 +868,7 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -896,19 +886,11 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 	return -EFAULT;
 }
 
-static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags,
+static int mtty_set_irqs(struct mdev_state *mdev_state, uint32_t flags,
 			 unsigned int index, unsigned int start,
 			 unsigned int count, void *data)
 {
 	int ret = 0;
-	struct mdev_state *mdev_state;
-
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
 
 	mutex_lock(&mdev_state->ops_lock);
 	switch (index) {
@@ -1024,21 +1006,13 @@ static int mtty_trigger_interrupt(struct mdev_state *mdev_state)
 	return ret;
 }
 
-static int mtty_get_region_info(struct mdev_device *mdev,
+static int mtty_get_region_info(struct mdev_state *mdev_state,
 			 struct vfio_region_info *region_info,
 			 u16 *cap_type_id, void **cap_type)
 {
 	unsigned int size = 0;
-	struct mdev_state *mdev_state;
 	u32 bar_index;
 
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
-
 	bar_index = region_info->index;
 	if (bar_index >= VFIO_PCI_NUM_REGIONS)
 		return -EINVAL;
@@ -1073,8 +1047,7 @@ static int mtty_get_region_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mtty_get_irq_info(struct mdev_device *mdev,
-			     struct vfio_irq_info *irq_info)
+static int mtty_get_irq_info(struct vfio_irq_info *irq_info)
 {
 	switch (irq_info->index) {
 	case VFIO_PCI_INTX_IRQ_INDEX:
@@ -1098,8 +1071,7 @@ static int mtty_get_irq_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mtty_get_device_info(struct mdev_device *mdev,
-			 struct vfio_device_info *dev_info)
+static int mtty_get_device_info(struct vfio_device_info *dev_info)
 {
 	dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
 	dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
@@ -1108,19 +1080,13 @@ static int mtty_get_device_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
+static long mtty_ioctl(struct vfio_device *vdev, unsigned int cmd,
 			unsigned long arg)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	int ret = 0;
 	unsigned long minsz;
-	struct mdev_state *mdev_state;
-
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -ENODEV;
 
 	switch (cmd) {
 	case VFIO_DEVICE_GET_INFO:
@@ -1135,7 +1101,7 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mtty_get_device_info(mdev, &info);
+		ret = mtty_get_device_info(&info);
 		if (ret)
 			return ret;
 
@@ -1160,7 +1126,7 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mtty_get_region_info(mdev, &info, &cap_type_id,
+		ret = mtty_get_region_info(mdev_state, &info, &cap_type_id,
 					   &cap_type);
 		if (ret)
 			return ret;
@@ -1184,7 +1150,7 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		    (info.index >= mdev_state->dev_info.num_irqs))
 			return -EINVAL;
 
-		ret = mtty_get_irq_info(mdev, &info);
+		ret = mtty_get_irq_info(&info);
 		if (ret)
 			return ret;
 
@@ -1218,25 +1184,25 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 				return PTR_ERR(data);
 		}
 
-		ret = mtty_set_irqs(mdev, hdr.flags, hdr.index, hdr.start,
+		ret = mtty_set_irqs(mdev_state, hdr.flags, hdr.index, hdr.start,
 				    hdr.count, data);
 
 		kfree(ptr);
 		return ret;
 	}
 	case VFIO_DEVICE_RESET:
-		return mtty_reset(mdev);
+		return mtty_reset(mdev_state);
 	}
 	return -ENOTTY;
 }
 
-static int mtty_open(struct mdev_device *mdev)
+static int mtty_open(struct vfio_device *vdev)
 {
 	pr_info("%s\n", __func__);
 	return 0;
 }
 
-static void mtty_close(struct mdev_device *mdev)
+static void mtty_close(struct vfio_device *mdev)
 {
 	pr_info("%s\n", __func__);
 }
@@ -1351,18 +1317,31 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
+static const struct vfio_device_ops mtty_dev_ops = {
+	.name = "vfio-mdev",
+	.open = mtty_open,
+	.release = mtty_close,
+	.read = mtty_read,
+	.write = mtty_write,
+	.ioctl = mtty_ioctl,
+};
+
+static struct mdev_driver mtty_driver = {
+	.driver = {
+		.name = "mtty",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+		.dev_groups = mdev_dev_groups,
+	},
+	.probe = mtty_probe,
+	.remove	= mtty_remove,
+};
+
 static const struct mdev_parent_ops mdev_fops = {
 	.owner                  = THIS_MODULE,
+	.device_driver		= &mtty_driver,
 	.dev_attr_groups        = mtty_dev_groups,
-	.mdev_attr_groups       = mdev_dev_groups,
 	.supported_type_groups  = mdev_type_groups,
-	.create                 = mtty_create,
-	.remove			= mtty_remove,
-	.open                   = mtty_open,
-	.release                = mtty_close,
-	.read                   = mtty_read,
-	.write                  = mtty_write,
-	.ioctl		        = mtty_ioctl,
 };
 
 static void mtty_device_release(struct device *dev)
@@ -1393,12 +1372,16 @@ static int __init mtty_dev_init(void)
 
 	pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt));
 
+	ret = mdev_register_driver(&mtty_driver);
+	if (ret)
+		goto err_cdev;
+
 	mtty_dev.vd_class = class_create(THIS_MODULE, MTTY_CLASS_NAME);
 
 	if (IS_ERR(mtty_dev.vd_class)) {
 		pr_err("Error: failed to register mtty_dev class\n");
 		ret = PTR_ERR(mtty_dev.vd_class);
-		goto failed1;
+		goto err_driver;
 	}
 
 	mtty_dev.dev.class = mtty_dev.vd_class;
@@ -1407,28 +1390,25 @@ static int __init mtty_dev_init(void)
 
 	ret = device_register(&mtty_dev.dev);
 	if (ret)
-		goto failed2;
+		goto err_class;
 
 	ret = mdev_register_device(&mtty_dev.dev, &mdev_fops);
 	if (ret)
-		goto failed3;
+		goto err_device;
 
 	mutex_init(&mdev_list_lock);
 	INIT_LIST_HEAD(&mdev_devices_list);
+	return 0;
 
-	goto all_done;
-
-failed3:
-
+err_device:
 	device_unregister(&mtty_dev.dev);
-failed2:
+err_class:
 	class_destroy(mtty_dev.vd_class);
-
-failed1:
+err_driver:
+	mdev_unregister_driver(&mtty_driver);
+err_cdev:
 	cdev_del(&mtty_dev.vd_cdev);
 	unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1);
-
-all_done:
 	return ret;
 }
 
@@ -1439,6 +1419,7 @@ static void __exit mtty_dev_exit(void)
 
 	device_unregister(&mtty_dev.dev);
 	idr_destroy(&mtty_dev.vd_idr);
+	mdev_unregister_driver(&mtty_driver);
 	cdev_del(&mtty_dev.vd_cdev);
 	unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1);
 	class_destroy(mtty_dev.vd_class);
-- 
2.30.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 08/10] vfio/mtty: Convert to use vfio_register_group_dev()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is straightforward conversion, the mdev_state is actually serving as
the vfio_device and we can replace all the mdev_get_drvdata()'s and the
wonky dead code with a simple container_of()

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 samples/vfio-mdev/mtty.c | 185 ++++++++++++++++++---------------------
 1 file changed, 83 insertions(+), 102 deletions(-)

diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index b9b24be4abda..d2a168420b77 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -127,6 +127,7 @@ struct serial_port {
 
 /* State of each mdev device */
 struct mdev_state {
+	struct vfio_device vdev;
 	int irq_fd;
 	struct eventfd_ctx *intx_evtfd;
 	struct eventfd_ctx *msi_evtfd;
@@ -150,6 +151,8 @@ static const struct file_operations vd_fops = {
 	.owner          = THIS_MODULE,
 };
 
+static const struct vfio_device_ops mtty_dev_ops;
+
 /* function prototypes */
 
 static int mtty_trigger_interrupt(struct mdev_state *mdev_state);
@@ -631,22 +634,15 @@ static void mdev_read_base(struct mdev_state *mdev_state)
 	}
 }
 
-static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
+static ssize_t mdev_access(struct mdev_state *mdev_state, u8 *buf, size_t count,
 			   loff_t pos, bool is_write)
 {
-	struct mdev_state *mdev_state;
 	unsigned int index;
 	loff_t offset;
 	int ret = 0;
 
-	if (!mdev || !buf)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state) {
-		pr_err("%s mdev_state not found\n", __func__);
+	if (!buf)
 		return -EINVAL;
-	}
 
 	mutex_lock(&mdev_state->ops_lock);
 
@@ -708,15 +704,18 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
 	return ret;
 }
 
-static int mtty_create(struct mdev_device *mdev)
+static int mtty_probe(struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state;
 	int nr_ports = mdev_get_type_group_id(mdev) + 1;
+	int ret;
 
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
 		return -ENOMEM;
 
+	vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mtty_dev_ops);
+
 	mdev_state->nr_ports = nr_ports;
 	mdev_state->irq_index = -1;
 	mdev_state->s[0].max_fifo_size = MAX_FIFO_SIZE;
@@ -731,7 +730,6 @@ static int mtty_create(struct mdev_device *mdev)
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
-	mdev_set_drvdata(mdev, mdev_state);
 
 	mtty_create_config_space(mdev_state);
 
@@ -739,50 +737,40 @@ static int mtty_create(struct mdev_device *mdev)
 	list_add(&mdev_state->next, &mdev_devices_list);
 	mutex_unlock(&mdev_list_lock);
 
+	ret = vfio_register_group_dev(&mdev_state->vdev);
+	if (ret) {
+		kfree(mdev_state);
+		return ret;
+	}
+	dev_set_drvdata(&mdev->dev, mdev_state);
 	return 0;
 }
 
-static int mtty_remove(struct mdev_device *mdev)
+static void mtty_remove(struct mdev_device *mdev)
 {
-	struct mdev_state *mds, *tmp_mds;
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	int ret = -EINVAL;
+	struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 
+	vfio_unregister_group_dev(&mdev_state->vdev);
 	mutex_lock(&mdev_list_lock);
-	list_for_each_entry_safe(mds, tmp_mds, &mdev_devices_list, next) {
-		if (mdev_state == mds) {
-			list_del(&mdev_state->next);
-			mdev_set_drvdata(mdev, NULL);
-			kfree(mdev_state->vconfig);
-			kfree(mdev_state);
-			ret = 0;
-			break;
-		}
-	}
+	list_del(&mdev_state->next);
 	mutex_unlock(&mdev_list_lock);
 
-	return ret;
+	kfree(mdev_state->vconfig);
+	kfree(mdev_state);
 }
 
-static int mtty_reset(struct mdev_device *mdev)
+static int mtty_reset(struct mdev_state *mdev_stte)
 {
-	struct mdev_state *mdev_state;
-
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
-
 	pr_info("%s: called\n", __func__);
 
 	return 0;
 }
 
-static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
+static ssize_t mtty_read(struct vfio_device *vdev, char __user *buf,
 			 size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -792,7 +780,7 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 		if (count >= 4 && !(*ppos % 4)) {
 			u32 val;
 
-			ret =  mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret =  mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					   *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -804,7 +792,7 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 		} else if (count >= 2 && !(*ppos % 2)) {
 			u16 val;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -816,7 +804,7 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 		} else {
 			u8 val;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -839,9 +827,11 @@ static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf,
 	return -EFAULT;
 }
 
-static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
+static ssize_t mtty_write(struct vfio_device *vdev, const char __user *buf,
 		   size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -854,7 +844,7 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -866,7 +856,7 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -878,7 +868,7 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (u8 *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (u8 *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -896,19 +886,11 @@ static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
 	return -EFAULT;
 }
 
-static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags,
+static int mtty_set_irqs(struct mdev_state *mdev_state, uint32_t flags,
 			 unsigned int index, unsigned int start,
 			 unsigned int count, void *data)
 {
 	int ret = 0;
-	struct mdev_state *mdev_state;
-
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
 
 	mutex_lock(&mdev_state->ops_lock);
 	switch (index) {
@@ -1024,21 +1006,13 @@ static int mtty_trigger_interrupt(struct mdev_state *mdev_state)
 	return ret;
 }
 
-static int mtty_get_region_info(struct mdev_device *mdev,
+static int mtty_get_region_info(struct mdev_state *mdev_state,
 			 struct vfio_region_info *region_info,
 			 u16 *cap_type_id, void **cap_type)
 {
 	unsigned int size = 0;
-	struct mdev_state *mdev_state;
 	u32 bar_index;
 
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
-
 	bar_index = region_info->index;
 	if (bar_index >= VFIO_PCI_NUM_REGIONS)
 		return -EINVAL;
@@ -1073,8 +1047,7 @@ static int mtty_get_region_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mtty_get_irq_info(struct mdev_device *mdev,
-			     struct vfio_irq_info *irq_info)
+static int mtty_get_irq_info(struct vfio_irq_info *irq_info)
 {
 	switch (irq_info->index) {
 	case VFIO_PCI_INTX_IRQ_INDEX:
@@ -1098,8 +1071,7 @@ static int mtty_get_irq_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mtty_get_device_info(struct mdev_device *mdev,
-			 struct vfio_device_info *dev_info)
+static int mtty_get_device_info(struct vfio_device_info *dev_info)
 {
 	dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
 	dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
@@ -1108,19 +1080,13 @@ static int mtty_get_device_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
+static long mtty_ioctl(struct vfio_device *vdev, unsigned int cmd,
 			unsigned long arg)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	int ret = 0;
 	unsigned long minsz;
-	struct mdev_state *mdev_state;
-
-	if (!mdev)
-		return -EINVAL;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -ENODEV;
 
 	switch (cmd) {
 	case VFIO_DEVICE_GET_INFO:
@@ -1135,7 +1101,7 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mtty_get_device_info(mdev, &info);
+		ret = mtty_get_device_info(&info);
 		if (ret)
 			return ret;
 
@@ -1160,7 +1126,7 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mtty_get_region_info(mdev, &info, &cap_type_id,
+		ret = mtty_get_region_info(mdev_state, &info, &cap_type_id,
 					   &cap_type);
 		if (ret)
 			return ret;
@@ -1184,7 +1150,7 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		    (info.index >= mdev_state->dev_info.num_irqs))
 			return -EINVAL;
 
-		ret = mtty_get_irq_info(mdev, &info);
+		ret = mtty_get_irq_info(&info);
 		if (ret)
 			return ret;
 
@@ -1218,25 +1184,25 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 				return PTR_ERR(data);
 		}
 
-		ret = mtty_set_irqs(mdev, hdr.flags, hdr.index, hdr.start,
+		ret = mtty_set_irqs(mdev_state, hdr.flags, hdr.index, hdr.start,
 				    hdr.count, data);
 
 		kfree(ptr);
 		return ret;
 	}
 	case VFIO_DEVICE_RESET:
-		return mtty_reset(mdev);
+		return mtty_reset(mdev_state);
 	}
 	return -ENOTTY;
 }
 
-static int mtty_open(struct mdev_device *mdev)
+static int mtty_open(struct vfio_device *vdev)
 {
 	pr_info("%s\n", __func__);
 	return 0;
 }
 
-static void mtty_close(struct mdev_device *mdev)
+static void mtty_close(struct vfio_device *mdev)
 {
 	pr_info("%s\n", __func__);
 }
@@ -1351,18 +1317,31 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
+static const struct vfio_device_ops mtty_dev_ops = {
+	.name = "vfio-mdev",
+	.open = mtty_open,
+	.release = mtty_close,
+	.read = mtty_read,
+	.write = mtty_write,
+	.ioctl = mtty_ioctl,
+};
+
+static struct mdev_driver mtty_driver = {
+	.driver = {
+		.name = "mtty",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+		.dev_groups = mdev_dev_groups,
+	},
+	.probe = mtty_probe,
+	.remove	= mtty_remove,
+};
+
 static const struct mdev_parent_ops mdev_fops = {
 	.owner                  = THIS_MODULE,
+	.device_driver		= &mtty_driver,
 	.dev_attr_groups        = mtty_dev_groups,
-	.mdev_attr_groups       = mdev_dev_groups,
 	.supported_type_groups  = mdev_type_groups,
-	.create                 = mtty_create,
-	.remove			= mtty_remove,
-	.open                   = mtty_open,
-	.release                = mtty_close,
-	.read                   = mtty_read,
-	.write                  = mtty_write,
-	.ioctl		        = mtty_ioctl,
 };
 
 static void mtty_device_release(struct device *dev)
@@ -1393,12 +1372,16 @@ static int __init mtty_dev_init(void)
 
 	pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt));
 
+	ret = mdev_register_driver(&mtty_driver);
+	if (ret)
+		goto err_cdev;
+
 	mtty_dev.vd_class = class_create(THIS_MODULE, MTTY_CLASS_NAME);
 
 	if (IS_ERR(mtty_dev.vd_class)) {
 		pr_err("Error: failed to register mtty_dev class\n");
 		ret = PTR_ERR(mtty_dev.vd_class);
-		goto failed1;
+		goto err_driver;
 	}
 
 	mtty_dev.dev.class = mtty_dev.vd_class;
@@ -1407,28 +1390,25 @@ static int __init mtty_dev_init(void)
 
 	ret = device_register(&mtty_dev.dev);
 	if (ret)
-		goto failed2;
+		goto err_class;
 
 	ret = mdev_register_device(&mtty_dev.dev, &mdev_fops);
 	if (ret)
-		goto failed3;
+		goto err_device;
 
 	mutex_init(&mdev_list_lock);
 	INIT_LIST_HEAD(&mdev_devices_list);
+	return 0;
 
-	goto all_done;
-
-failed3:
-
+err_device:
 	device_unregister(&mtty_dev.dev);
-failed2:
+err_class:
 	class_destroy(mtty_dev.vd_class);
-
-failed1:
+err_driver:
+	mdev_unregister_driver(&mtty_driver);
+err_cdev:
 	cdev_del(&mtty_dev.vd_cdev);
 	unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1);
-
-all_done:
 	return ret;
 }
 
@@ -1439,6 +1419,7 @@ static void __exit mtty_dev_exit(void)
 
 	device_unregister(&mtty_dev.dev);
 	idr_destroy(&mtty_dev.vd_idr);
+	mdev_unregister_driver(&mtty_driver);
 	cdev_del(&mtty_dev.vd_cdev);
 	unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1);
 	class_destroy(mtty_dev.vd_class);
-- 
2.30.2

[Intel-gfx] [PATCH 09/10] vfio/mdpy: Convert to use vfio_register_group_dev()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is straightforward conversion, the mdev_state is actually serving as
the vfio_device and we can replace all the mdev_get_drvdata()'s and the
wonky dead code with a simple container_of().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 samples/vfio-mdev/mdpy.c | 159 ++++++++++++++++++++++-----------------
 1 file changed, 88 insertions(+), 71 deletions(-)

diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index e889c1cf8fd1..7e9c9df0f05b 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -85,9 +85,11 @@ static struct class	*mdpy_class;
 static struct cdev	mdpy_cdev;
 static struct device	mdpy_dev;
 static u32		mdpy_count;
+static const struct vfio_device_ops mdpy_dev_ops;
 
 /* State of each mdev device */
 struct mdev_state {
+	struct vfio_device vdev;
 	u8 *vconfig;
 	u32 bar_mask;
 	struct mutex ops_lock;
@@ -162,11 +164,9 @@ static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
 	}
 }
 
-static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
-			   loff_t pos, bool is_write)
+static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf,
+			   size_t count, loff_t pos, bool is_write)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
 	int ret = 0;
 
 	mutex_lock(&mdev_state->ops_lock);
@@ -187,8 +187,9 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 			memcpy(buf, mdev_state->memblk, count);
 
 	} else {
-		dev_info(dev, "%s: %s @0x%llx (unhandled)\n",
-			 __func__, is_write ? "WR" : "RD", pos);
+		dev_info(mdev_state->vdev.dev,
+			 "%s: %s @0x%llx (unhandled)\n", __func__,
+			 is_write ? "WR" : "RD", pos);
 		ret = -1;
 		goto accessfailed;
 	}
@@ -202,9 +203,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 	return ret;
 }
 
-static int mdpy_reset(struct mdev_device *mdev)
+static int mdpy_reset(struct mdev_state *mdev_state)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 	u32 stride, i;
 
 	/* initialize with gray gradient */
@@ -216,13 +216,14 @@ static int mdpy_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mdpy_create(struct mdev_device *mdev)
+static int mdpy_probe(struct mdev_device *mdev)
 {
 	const struct mdpy_type *type =
 		&mdpy_types[mdev_get_type_group_id(mdev)];
 	struct device *dev = mdev_dev(mdev);
 	struct mdev_state *mdev_state;
 	u32 fbsize;
+	int ret;
 
 	if (mdpy_count >= max_devices)
 		return -ENOMEM;
@@ -230,6 +231,7 @@ static int mdpy_create(struct mdev_device *mdev)
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
 		return -ENOMEM;
+	vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mdpy_dev_ops);
 
 	mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
 	if (mdev_state->vconfig == NULL) {
@@ -250,36 +252,41 @@ static int mdpy_create(struct mdev_device *mdev)
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
-	mdev_set_drvdata(mdev, mdev_state);
-
 	mdev_state->type    = type;
 	mdev_state->memsize = fbsize;
 	mdpy_create_config_space(mdev_state);
-	mdpy_reset(mdev);
+	mdpy_reset(mdev_state);
 
 	mdpy_count++;
+
+	ret = vfio_register_group_dev(&mdev_state->vdev);
+	if (ret) {
+		kfree(mdev_state);
+		return ret;
+	}
+	dev_set_drvdata(&mdev->dev, mdev_state);
 	return 0;
 }
 
-static int mdpy_remove(struct mdev_device *mdev)
+static void mdpy_remove(struct mdev_device *mdev)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 
-	dev_info(dev, "%s\n", __func__);
+	dev_info(&mdev->dev, "%s\n", __func__);
 
-	mdev_set_drvdata(mdev, NULL);
+	vfio_unregister_group_dev(&mdev_state->vdev);
 	vfree(mdev_state->memblk);
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
 
 	mdpy_count--;
-	return 0;
 }
 
-static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
+static ssize_t mdpy_read(struct vfio_device *vdev, char __user *buf,
 			 size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -289,8 +296,8 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 		if (count >= 4 && !(*ppos % 4)) {
 			u32 val;
 
-			ret =  mdev_access(mdev, (char *)&val, sizeof(val),
-					   *ppos, false);
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
+					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
 
@@ -301,7 +308,7 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 		} else if (count >= 2 && !(*ppos % 2)) {
 			u16 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -313,7 +320,7 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 		} else {
 			u8 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -336,9 +343,11 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 	return -EFAULT;
 }
 
-static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
+static ssize_t mdpy_write(struct vfio_device *vdev, const char __user *buf,
 			  size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -351,7 +360,7 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -363,7 +372,7 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -375,7 +384,7 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -393,9 +402,10 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 	return -EFAULT;
 }
 
-static int mdpy_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
+static int mdpy_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 
 	if (vma->vm_pgoff != MDPY_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
 		return -EINVAL;
@@ -409,16 +419,10 @@ static int mdpy_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
 	return remap_vmalloc_range(vma, mdev_state->memblk, 0);
 }
 
-static int mdpy_get_region_info(struct mdev_device *mdev,
+static int mdpy_get_region_info(struct mdev_state *mdev_state,
 				struct vfio_region_info *region_info,
 				u16 *cap_type_id, void **cap_type)
 {
-	struct mdev_state *mdev_state;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
-
 	if (region_info->index >= VFIO_PCI_NUM_REGIONS &&
 	    region_info->index != MDPY_DISPLAY_REGION)
 		return -EINVAL;
@@ -447,15 +451,13 @@ static int mdpy_get_region_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mdpy_get_irq_info(struct mdev_device *mdev,
-			     struct vfio_irq_info *irq_info)
+static int mdpy_get_irq_info(struct vfio_irq_info *irq_info)
 {
 	irq_info->count = 0;
 	return 0;
 }
 
-static int mdpy_get_device_info(struct mdev_device *mdev,
-				struct vfio_device_info *dev_info)
+static int mdpy_get_device_info(struct vfio_device_info *dev_info)
 {
 	dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
 	dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
@@ -463,11 +465,9 @@ static int mdpy_get_device_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mdpy_query_gfx_plane(struct mdev_device *mdev,
+static int mdpy_query_gfx_plane(struct mdev_state *mdev_state,
 				struct vfio_device_gfx_plane_info *plane)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-
 	if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
 		if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
 				     VFIO_GFX_PLANE_TYPE_REGION))
@@ -496,14 +496,13 @@ static int mdpy_query_gfx_plane(struct mdev_device *mdev,
 	return 0;
 }
 
-static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
+static long mdpy_ioctl(struct vfio_device *vdev, unsigned int cmd,
 		       unsigned long arg)
 {
 	int ret = 0;
 	unsigned long minsz;
-	struct mdev_state *mdev_state;
-
-	mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 
 	switch (cmd) {
 	case VFIO_DEVICE_GET_INFO:
@@ -518,7 +517,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mdpy_get_device_info(mdev, &info);
+		ret = mdpy_get_device_info(&info);
 		if (ret)
 			return ret;
 
@@ -543,7 +542,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mdpy_get_region_info(mdev, &info, &cap_type_id,
+		ret = mdpy_get_region_info(mdev_state, &info, &cap_type_id,
 					   &cap_type);
 		if (ret)
 			return ret;
@@ -567,7 +566,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		    (info.index >= mdev_state->dev_info.num_irqs))
 			return -EINVAL;
 
-		ret = mdpy_get_irq_info(mdev, &info);
+		ret = mdpy_get_irq_info(&info);
 		if (ret)
 			return ret;
 
@@ -590,7 +589,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (plane.argsz < minsz)
 			return -EINVAL;
 
-		ret = mdpy_query_gfx_plane(mdev, &plane);
+		ret = mdpy_query_gfx_plane(mdev_state, &plane);
 		if (ret)
 			return ret;
 
@@ -604,12 +603,12 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		return -EINVAL;
 
 	case VFIO_DEVICE_RESET:
-		return mdpy_reset(mdev);
+		return mdpy_reset(mdev_state);
 	}
 	return -ENOTTY;
 }
 
-static int mdpy_open(struct mdev_device *mdev)
+static int mdpy_open(struct vfio_device *vdev)
 {
 	if (!try_module_get(THIS_MODULE))
 		return -ENODEV;
@@ -617,7 +616,7 @@ static int mdpy_open(struct mdev_device *mdev)
 	return 0;
 }
 
-static void mdpy_close(struct mdev_device *mdev)
+static void mdpy_close(struct vfio_device *vdev)
 {
 	module_put(THIS_MODULE);
 }
@@ -626,8 +625,7 @@ static ssize_t
 resolution_show(struct device *dev, struct device_attribute *attr,
 		char *buf)
 {
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%dx%d\n",
 		       mdev_state->type->width,
@@ -716,18 +714,30 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
+static const struct vfio_device_ops mdpy_dev_ops = {
+	.open = mdpy_open,
+	.release = mdpy_close,
+	.read = mdpy_read,
+	.write = mdpy_write,
+	.ioctl = mdpy_ioctl,
+	.mmap = mdpy_mmap,
+};
+
+static struct mdev_driver mdpy_driver = {
+	.driver = {
+		.name = "mdpy",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+		.dev_groups = mdev_dev_groups,
+	},
+	.probe = mdpy_probe,
+	.remove	= mdpy_remove,
+};
+
 static const struct mdev_parent_ops mdev_fops = {
 	.owner			= THIS_MODULE,
-	.mdev_attr_groups	= mdev_dev_groups,
+	.device_driver          = &mdpy_driver,
 	.supported_type_groups	= mdev_type_groups,
-	.create			= mdpy_create,
-	.remove			= mdpy_remove,
-	.open			= mdpy_open,
-	.release		= mdpy_close,
-	.read			= mdpy_read,
-	.write			= mdpy_write,
-	.ioctl			= mdpy_ioctl,
-	.mmap			= mdpy_mmap,
 };
 
 static const struct file_operations vd_fops = {
@@ -752,11 +762,15 @@ static int __init mdpy_dev_init(void)
 	cdev_add(&mdpy_cdev, mdpy_devt, MINORMASK + 1);
 	pr_info("%s: major %d\n", __func__, MAJOR(mdpy_devt));
 
+	ret = mdev_register_driver(&mdpy_driver);
+	if (ret)
+		goto err_cdev;
+
 	mdpy_class = class_create(THIS_MODULE, MDPY_CLASS_NAME);
 	if (IS_ERR(mdpy_class)) {
 		pr_err("Error: failed to register mdpy_dev class\n");
 		ret = PTR_ERR(mdpy_class);
-		goto failed1;
+		goto err_driver;
 	}
 	mdpy_dev.class = mdpy_class;
 	mdpy_dev.release = mdpy_device_release;
@@ -764,19 +778,21 @@ static int __init mdpy_dev_init(void)
 
 	ret = device_register(&mdpy_dev);
 	if (ret)
-		goto failed2;
+		goto err_class;
 
 	ret = mdev_register_device(&mdpy_dev, &mdev_fops);
 	if (ret)
-		goto failed3;
+		goto err_device;
 
 	return 0;
 
-failed3:
+err_device:
 	device_unregister(&mdpy_dev);
-failed2:
+err_class:
 	class_destroy(mdpy_class);
-failed1:
+err_driver:
+	mdev_unregister_driver(&mdpy_driver);
+err_cdev:
 	cdev_del(&mdpy_cdev);
 	unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
 	return ret;
@@ -788,6 +804,7 @@ static void __exit mdpy_dev_exit(void)
 	mdev_unregister_device(&mdpy_dev);
 
 	device_unregister(&mdpy_dev);
+	mdev_unregister_driver(&mdpy_driver);
 	cdev_del(&mdpy_cdev);
 	unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
 	class_destroy(mdpy_class);
-- 
2.30.2

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[PATCH 09/10] vfio/mdpy: Convert to use vfio_register_group_dev()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is straightforward conversion, the mdev_state is actually serving as
the vfio_device and we can replace all the mdev_get_drvdata()'s and the
wonky dead code with a simple container_of().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 samples/vfio-mdev/mdpy.c | 159 ++++++++++++++++++++++-----------------
 1 file changed, 88 insertions(+), 71 deletions(-)

diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index e889c1cf8fd1..7e9c9df0f05b 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -85,9 +85,11 @@ static struct class	*mdpy_class;
 static struct cdev	mdpy_cdev;
 static struct device	mdpy_dev;
 static u32		mdpy_count;
+static const struct vfio_device_ops mdpy_dev_ops;
 
 /* State of each mdev device */
 struct mdev_state {
+	struct vfio_device vdev;
 	u8 *vconfig;
 	u32 bar_mask;
 	struct mutex ops_lock;
@@ -162,11 +164,9 @@ static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
 	}
 }
 
-static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
-			   loff_t pos, bool is_write)
+static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf,
+			   size_t count, loff_t pos, bool is_write)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
 	int ret = 0;
 
 	mutex_lock(&mdev_state->ops_lock);
@@ -187,8 +187,9 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 			memcpy(buf, mdev_state->memblk, count);
 
 	} else {
-		dev_info(dev, "%s: %s @0x%llx (unhandled)\n",
-			 __func__, is_write ? "WR" : "RD", pos);
+		dev_info(mdev_state->vdev.dev,
+			 "%s: %s @0x%llx (unhandled)\n", __func__,
+			 is_write ? "WR" : "RD", pos);
 		ret = -1;
 		goto accessfailed;
 	}
@@ -202,9 +203,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 	return ret;
 }
 
-static int mdpy_reset(struct mdev_device *mdev)
+static int mdpy_reset(struct mdev_state *mdev_state)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 	u32 stride, i;
 
 	/* initialize with gray gradient */
@@ -216,13 +216,14 @@ static int mdpy_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mdpy_create(struct mdev_device *mdev)
+static int mdpy_probe(struct mdev_device *mdev)
 {
 	const struct mdpy_type *type =
 		&mdpy_types[mdev_get_type_group_id(mdev)];
 	struct device *dev = mdev_dev(mdev);
 	struct mdev_state *mdev_state;
 	u32 fbsize;
+	int ret;
 
 	if (mdpy_count >= max_devices)
 		return -ENOMEM;
@@ -230,6 +231,7 @@ static int mdpy_create(struct mdev_device *mdev)
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
 		return -ENOMEM;
+	vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mdpy_dev_ops);
 
 	mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
 	if (mdev_state->vconfig == NULL) {
@@ -250,36 +252,41 @@ static int mdpy_create(struct mdev_device *mdev)
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
-	mdev_set_drvdata(mdev, mdev_state);
-
 	mdev_state->type    = type;
 	mdev_state->memsize = fbsize;
 	mdpy_create_config_space(mdev_state);
-	mdpy_reset(mdev);
+	mdpy_reset(mdev_state);
 
 	mdpy_count++;
+
+	ret = vfio_register_group_dev(&mdev_state->vdev);
+	if (ret) {
+		kfree(mdev_state);
+		return ret;
+	}
+	dev_set_drvdata(&mdev->dev, mdev_state);
 	return 0;
 }
 
-static int mdpy_remove(struct mdev_device *mdev)
+static void mdpy_remove(struct mdev_device *mdev)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 
-	dev_info(dev, "%s\n", __func__);
+	dev_info(&mdev->dev, "%s\n", __func__);
 
-	mdev_set_drvdata(mdev, NULL);
+	vfio_unregister_group_dev(&mdev_state->vdev);
 	vfree(mdev_state->memblk);
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
 
 	mdpy_count--;
-	return 0;
 }
 
-static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
+static ssize_t mdpy_read(struct vfio_device *vdev, char __user *buf,
 			 size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -289,8 +296,8 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 		if (count >= 4 && !(*ppos % 4)) {
 			u32 val;
 
-			ret =  mdev_access(mdev, (char *)&val, sizeof(val),
-					   *ppos, false);
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
+					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
 
@@ -301,7 +308,7 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 		} else if (count >= 2 && !(*ppos % 2)) {
 			u16 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -313,7 +320,7 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 		} else {
 			u8 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -336,9 +343,11 @@ static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
 	return -EFAULT;
 }
 
-static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
+static ssize_t mdpy_write(struct vfio_device *vdev, const char __user *buf,
 			  size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -351,7 +360,7 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -363,7 +372,7 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -375,7 +384,7 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -393,9 +402,10 @@ static ssize_t mdpy_write(struct mdev_device *mdev, const char __user *buf,
 	return -EFAULT;
 }
 
-static int mdpy_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
+static int mdpy_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 
 	if (vma->vm_pgoff != MDPY_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
 		return -EINVAL;
@@ -409,16 +419,10 @@ static int mdpy_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
 	return remap_vmalloc_range(vma, mdev_state->memblk, 0);
 }
 
-static int mdpy_get_region_info(struct mdev_device *mdev,
+static int mdpy_get_region_info(struct mdev_state *mdev_state,
 				struct vfio_region_info *region_info,
 				u16 *cap_type_id, void **cap_type)
 {
-	struct mdev_state *mdev_state;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
-
 	if (region_info->index >= VFIO_PCI_NUM_REGIONS &&
 	    region_info->index != MDPY_DISPLAY_REGION)
 		return -EINVAL;
@@ -447,15 +451,13 @@ static int mdpy_get_region_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mdpy_get_irq_info(struct mdev_device *mdev,
-			     struct vfio_irq_info *irq_info)
+static int mdpy_get_irq_info(struct vfio_irq_info *irq_info)
 {
 	irq_info->count = 0;
 	return 0;
 }
 
-static int mdpy_get_device_info(struct mdev_device *mdev,
-				struct vfio_device_info *dev_info)
+static int mdpy_get_device_info(struct vfio_device_info *dev_info)
 {
 	dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
 	dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
@@ -463,11 +465,9 @@ static int mdpy_get_device_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mdpy_query_gfx_plane(struct mdev_device *mdev,
+static int mdpy_query_gfx_plane(struct mdev_state *mdev_state,
 				struct vfio_device_gfx_plane_info *plane)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-
 	if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
 		if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
 				     VFIO_GFX_PLANE_TYPE_REGION))
@@ -496,14 +496,13 @@ static int mdpy_query_gfx_plane(struct mdev_device *mdev,
 	return 0;
 }
 
-static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
+static long mdpy_ioctl(struct vfio_device *vdev, unsigned int cmd,
 		       unsigned long arg)
 {
 	int ret = 0;
 	unsigned long minsz;
-	struct mdev_state *mdev_state;
-
-	mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 
 	switch (cmd) {
 	case VFIO_DEVICE_GET_INFO:
@@ -518,7 +517,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mdpy_get_device_info(mdev, &info);
+		ret = mdpy_get_device_info(&info);
 		if (ret)
 			return ret;
 
@@ -543,7 +542,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mdpy_get_region_info(mdev, &info, &cap_type_id,
+		ret = mdpy_get_region_info(mdev_state, &info, &cap_type_id,
 					   &cap_type);
 		if (ret)
 			return ret;
@@ -567,7 +566,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		    (info.index >= mdev_state->dev_info.num_irqs))
 			return -EINVAL;
 
-		ret = mdpy_get_irq_info(mdev, &info);
+		ret = mdpy_get_irq_info(&info);
 		if (ret)
 			return ret;
 
@@ -590,7 +589,7 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (plane.argsz < minsz)
 			return -EINVAL;
 
-		ret = mdpy_query_gfx_plane(mdev, &plane);
+		ret = mdpy_query_gfx_plane(mdev_state, &plane);
 		if (ret)
 			return ret;
 
@@ -604,12 +603,12 @@ static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		return -EINVAL;
 
 	case VFIO_DEVICE_RESET:
-		return mdpy_reset(mdev);
+		return mdpy_reset(mdev_state);
 	}
 	return -ENOTTY;
 }
 
-static int mdpy_open(struct mdev_device *mdev)
+static int mdpy_open(struct vfio_device *vdev)
 {
 	if (!try_module_get(THIS_MODULE))
 		return -ENODEV;
@@ -617,7 +616,7 @@ static int mdpy_open(struct mdev_device *mdev)
 	return 0;
 }
 
-static void mdpy_close(struct mdev_device *mdev)
+static void mdpy_close(struct vfio_device *vdev)
 {
 	module_put(THIS_MODULE);
 }
@@ -626,8 +625,7 @@ static ssize_t
 resolution_show(struct device *dev, struct device_attribute *attr,
 		char *buf)
 {
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%dx%d\n",
 		       mdev_state->type->width,
@@ -716,18 +714,30 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
+static const struct vfio_device_ops mdpy_dev_ops = {
+	.open = mdpy_open,
+	.release = mdpy_close,
+	.read = mdpy_read,
+	.write = mdpy_write,
+	.ioctl = mdpy_ioctl,
+	.mmap = mdpy_mmap,
+};
+
+static struct mdev_driver mdpy_driver = {
+	.driver = {
+		.name = "mdpy",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+		.dev_groups = mdev_dev_groups,
+	},
+	.probe = mdpy_probe,
+	.remove	= mdpy_remove,
+};
+
 static const struct mdev_parent_ops mdev_fops = {
 	.owner			= THIS_MODULE,
-	.mdev_attr_groups	= mdev_dev_groups,
+	.device_driver          = &mdpy_driver,
 	.supported_type_groups	= mdev_type_groups,
-	.create			= mdpy_create,
-	.remove			= mdpy_remove,
-	.open			= mdpy_open,
-	.release		= mdpy_close,
-	.read			= mdpy_read,
-	.write			= mdpy_write,
-	.ioctl			= mdpy_ioctl,
-	.mmap			= mdpy_mmap,
 };
 
 static const struct file_operations vd_fops = {
@@ -752,11 +762,15 @@ static int __init mdpy_dev_init(void)
 	cdev_add(&mdpy_cdev, mdpy_devt, MINORMASK + 1);
 	pr_info("%s: major %d\n", __func__, MAJOR(mdpy_devt));
 
+	ret = mdev_register_driver(&mdpy_driver);
+	if (ret)
+		goto err_cdev;
+
 	mdpy_class = class_create(THIS_MODULE, MDPY_CLASS_NAME);
 	if (IS_ERR(mdpy_class)) {
 		pr_err("Error: failed to register mdpy_dev class\n");
 		ret = PTR_ERR(mdpy_class);
-		goto failed1;
+		goto err_driver;
 	}
 	mdpy_dev.class = mdpy_class;
 	mdpy_dev.release = mdpy_device_release;
@@ -764,19 +778,21 @@ static int __init mdpy_dev_init(void)
 
 	ret = device_register(&mdpy_dev);
 	if (ret)
-		goto failed2;
+		goto err_class;
 
 	ret = mdev_register_device(&mdpy_dev, &mdev_fops);
 	if (ret)
-		goto failed3;
+		goto err_device;
 
 	return 0;
 
-failed3:
+err_device:
 	device_unregister(&mdpy_dev);
-failed2:
+err_class:
 	class_destroy(mdpy_class);
-failed1:
+err_driver:
+	mdev_unregister_driver(&mdpy_driver);
+err_cdev:
 	cdev_del(&mdpy_cdev);
 	unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
 	return ret;
@@ -788,6 +804,7 @@ static void __exit mdpy_dev_exit(void)
 	mdev_unregister_device(&mdpy_dev);
 
 	device_unregister(&mdpy_dev);
+	mdev_unregister_driver(&mdpy_driver);
 	cdev_del(&mdpy_cdev);
 	unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
 	class_destroy(mdpy_class);
-- 
2.30.2

[Intel-gfx] [PATCH 10/10] vfio/mbochs: Convert to use vfio_register_group_dev()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is straightforward conversion, the mdev_state is actually serving as
the vfio_device and we can replace all the mdev_get_drvdata()'s and the
wonky dead code with a simple container_of().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 samples/vfio-mdev/mbochs.c | 163 +++++++++++++++++++++----------------
 1 file changed, 91 insertions(+), 72 deletions(-)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index 881ef9a7296f..6c0f229db36a 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -130,6 +130,7 @@ static struct class	*mbochs_class;
 static struct cdev	mbochs_cdev;
 static struct device	mbochs_dev;
 static int		mbochs_used_mbytes;
+static const struct vfio_device_ops mbochs_dev_ops;
 
 struct vfio_region_info_ext {
 	struct vfio_region_info          base;
@@ -160,6 +161,7 @@ struct mbochs_dmabuf {
 
 /* State of each mdev device */
 struct mdev_state {
+	struct vfio_device vdev;
 	u8 *vconfig;
 	u64 bar_mask[3];
 	u32 memory_bar_mask;
@@ -425,11 +427,9 @@ static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
 		memcpy(buf, mdev_state->edid_blob + offset, count);
 }
 
-static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
-			   loff_t pos, bool is_write)
+static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf,
+			   size_t count, loff_t pos, bool is_write)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
 	struct page *pg;
 	loff_t poff;
 	char *map;
@@ -478,7 +478,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 		put_page(pg);
 
 	} else {
-		dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
+		dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n",
 			__func__, is_write ? "WR" : "RD", pos);
 		ret = -1;
 		goto accessfailed;
@@ -493,9 +493,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 	return ret;
 }
 
-static int mbochs_reset(struct mdev_device *mdev)
+static int mbochs_reset(struct mdev_state *mdev_state)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 	u32 size64k = mdev_state->memsize / (64 * 1024);
 	int i;
 
@@ -506,12 +505,13 @@ static int mbochs_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mbochs_create(struct mdev_device *mdev)
+static int mbochs_probe(struct mdev_device *mdev)
 {
 	const struct mbochs_type *type =
 		&mbochs_types[mdev_get_type_group_id(mdev)];
 	struct device *dev = mdev_dev(mdev);
 	struct mdev_state *mdev_state;
+	int ret = -ENOMEM;
 
 	if (type->mbytes + mbochs_used_mbytes > max_mbytes)
 		return -ENOMEM;
@@ -519,6 +519,7 @@ static int mbochs_create(struct mdev_device *mdev)
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
 		return -ENOMEM;
+	vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops);
 
 	mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
 	if (mdev_state->vconfig == NULL)
@@ -537,7 +538,6 @@ static int mbochs_create(struct mdev_device *mdev)
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
-	mdev_set_drvdata(mdev, mdev_state);
 	INIT_LIST_HEAD(&mdev_state->dmabufs);
 	mdev_state->next_id = 1;
 
@@ -547,32 +547,38 @@ static int mbochs_create(struct mdev_device *mdev)
 	mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
 	mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
 	mbochs_create_config_space(mdev_state);
-	mbochs_reset(mdev);
+	mbochs_reset(mdev_state);
 
 	mbochs_used_mbytes += type->mbytes;
+
+	ret = vfio_register_group_dev(&mdev_state->vdev);
+	if (ret)
+		goto err_mem;
+	dev_set_drvdata(&mdev->dev, mdev_state);
 	return 0;
 
 err_mem:
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
-	return -ENOMEM;
+	return ret;
 }
 
-static int mbochs_remove(struct mdev_device *mdev)
+static void mbochs_remove(struct mdev_device *mdev)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 
 	mbochs_used_mbytes -= mdev_state->type->mbytes;
-	mdev_set_drvdata(mdev, NULL);
+	vfio_unregister_group_dev(&mdev_state->vdev);
 	kfree(mdev_state->pages);
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
-	return 0;
 }
 
-static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
+static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf,
 			   size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -582,7 +588,7 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 		if (count >= 4 && !(*ppos % 4)) {
 			u32 val;
 
-			ret =  mdev_access(mdev, (char *)&val, sizeof(val),
+			ret =  mdev_access(mdev_state, (char *)&val, sizeof(val),
 					   *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -594,7 +600,7 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 		} else if (count >= 2 && !(*ppos % 2)) {
 			u16 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -606,7 +612,7 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 		} else {
 			u8 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -629,9 +635,11 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 	return -EFAULT;
 }
 
-static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
+static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf,
 			    size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -644,7 +652,7 @@ static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -656,7 +664,7 @@ static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -668,7 +676,7 @@ static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -754,9 +762,10 @@ static const struct vm_operations_struct mbochs_region_vm_ops = {
 	.fault = mbochs_region_vm_fault,
 };
 
-static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
+static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 
 	if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
 		return -EINVAL;
@@ -963,7 +972,7 @@ mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
 {
 	struct mdev_state *mdev_state = dmabuf->mdev_state;
-	struct device *dev = mdev_dev(mdev_state->mdev);
+	struct device *dev = mdev_state->vdev.dev;
 	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 	struct dma_buf *buf;
 
@@ -991,15 +1000,10 @@ static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
 	return 0;
 }
 
-static int mbochs_get_region_info(struct mdev_device *mdev,
+static int mbochs_get_region_info(struct mdev_state *mdev_state,
 				  struct vfio_region_info_ext *ext)
 {
 	struct vfio_region_info *region_info = &ext->base;
-	struct mdev_state *mdev_state;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
 
 	if (region_info->index >= MBOCHS_NUM_REGIONS)
 		return -EINVAL;
@@ -1047,15 +1051,13 @@ static int mbochs_get_region_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mbochs_get_irq_info(struct mdev_device *mdev,
-			       struct vfio_irq_info *irq_info)
+static int mbochs_get_irq_info(struct vfio_irq_info *irq_info)
 {
 	irq_info->count = 0;
 	return 0;
 }
 
-static int mbochs_get_device_info(struct mdev_device *mdev,
-				  struct vfio_device_info *dev_info)
+static int mbochs_get_device_info(struct vfio_device_info *dev_info)
 {
 	dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
 	dev_info->num_regions = MBOCHS_NUM_REGIONS;
@@ -1063,11 +1065,9 @@ static int mbochs_get_device_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mbochs_query_gfx_plane(struct mdev_device *mdev,
+static int mbochs_query_gfx_plane(struct mdev_state *mdev_state,
 				  struct vfio_device_gfx_plane_info *plane)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
 	struct mbochs_dmabuf *dmabuf;
 	struct mbochs_mode mode;
 	int ret;
@@ -1121,18 +1121,16 @@ static int mbochs_query_gfx_plane(struct mdev_device *mdev,
 done:
 	if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
 	    mdev_state->active_id != plane->dmabuf_id) {
-		dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
-			mdev_state->active_id, plane->dmabuf_id);
+		dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n",
+			__func__, mdev_state->active_id, plane->dmabuf_id);
 		mdev_state->active_id = plane->dmabuf_id;
 	}
 	mutex_unlock(&mdev_state->ops_lock);
 	return 0;
 }
 
-static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
-				 u32 id)
+static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 	struct mbochs_dmabuf *dmabuf;
 
 	mutex_lock(&mdev_state->ops_lock);
@@ -1154,9 +1152,11 @@ static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
 	return dma_buf_fd(dmabuf->buf, 0);
 }
 
-static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
-			unsigned long arg)
+static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
+			 unsigned long arg)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	int ret = 0;
 	unsigned long minsz, outsz;
 
@@ -1173,7 +1173,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mbochs_get_device_info(mdev, &info);
+		ret = mbochs_get_device_info(&info);
 		if (ret)
 			return ret;
 
@@ -1197,7 +1197,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (outsz > sizeof(info))
 			return -EINVAL;
 
-		ret = mbochs_get_region_info(mdev, &info);
+		ret = mbochs_get_region_info(mdev_state, &info);
 		if (ret)
 			return ret;
 
@@ -1220,7 +1220,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		    (info.index >= VFIO_PCI_NUM_IRQS))
 			return -EINVAL;
 
-		ret = mbochs_get_irq_info(mdev, &info);
+		ret = mbochs_get_irq_info(&info);
 		if (ret)
 			return ret;
 
@@ -1243,7 +1243,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (plane.argsz < minsz)
 			return -EINVAL;
 
-		ret = mbochs_query_gfx_plane(mdev, &plane);
+		ret = mbochs_query_gfx_plane(mdev_state, &plane);
 		if (ret)
 			return ret;
 
@@ -1260,19 +1260,19 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (get_user(dmabuf_id, (__u32 __user *)arg))
 			return -EFAULT;
 
-		return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
+		return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id);
 	}
 
 	case VFIO_DEVICE_SET_IRQS:
 		return -EINVAL;
 
 	case VFIO_DEVICE_RESET:
-		return mbochs_reset(mdev);
+		return mbochs_reset(mdev_state);
 	}
 	return -ENOTTY;
 }
 
-static int mbochs_open(struct mdev_device *mdev)
+static int mbochs_open(struct vfio_device *vdev)
 {
 	if (!try_module_get(THIS_MODULE))
 		return -ENODEV;
@@ -1280,9 +1280,10 @@ static int mbochs_open(struct mdev_device *mdev)
 	return 0;
 }
 
-static void mbochs_close(struct mdev_device *mdev)
+static void mbochs_close(struct vfio_device *vdev)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	struct mbochs_dmabuf *dmabuf, *tmp;
 
 	mutex_lock(&mdev_state->ops_lock);
@@ -1306,8 +1307,7 @@ static ssize_t
 memory_show(struct device *dev, struct device_attribute *attr,
 	    char *buf)
 {
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
 }
@@ -1398,18 +1398,30 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
+static const struct vfio_device_ops mbochs_dev_ops = {
+	.open = mbochs_open,
+	.release = mbochs_close,
+	.read = mbochs_read,
+	.write = mbochs_write,
+	.ioctl = mbochs_ioctl,
+	.mmap = mbochs_mmap,
+};
+
+static struct mdev_driver mbochs_driver = {
+	.driver = {
+		.name = "mbochs",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+		.dev_groups = mdev_dev_groups,
+	},
+	.probe = mbochs_probe,
+	.remove	= mbochs_remove,
+};
+
 static const struct mdev_parent_ops mdev_fops = {
 	.owner			= THIS_MODULE,
-	.mdev_attr_groups	= mdev_dev_groups,
+	.device_driver		= &mbochs_driver,
 	.supported_type_groups	= mdev_type_groups,
-	.create			= mbochs_create,
-	.remove			= mbochs_remove,
-	.open			= mbochs_open,
-	.release		= mbochs_close,
-	.read			= mbochs_read,
-	.write			= mbochs_write,
-	.ioctl			= mbochs_ioctl,
-	.mmap			= mbochs_mmap,
 };
 
 static const struct file_operations vd_fops = {
@@ -1434,11 +1446,15 @@ static int __init mbochs_dev_init(void)
 	cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
 	pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
 
+	ret = mdev_register_driver(&mbochs_driver);
+	if (ret)
+		goto err_cdev;
+
 	mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
 	if (IS_ERR(mbochs_class)) {
 		pr_err("Error: failed to register mbochs_dev class\n");
 		ret = PTR_ERR(mbochs_class);
-		goto failed1;
+		goto err_driver;
 	}
 	mbochs_dev.class = mbochs_class;
 	mbochs_dev.release = mbochs_device_release;
@@ -1446,19 +1462,21 @@ static int __init mbochs_dev_init(void)
 
 	ret = device_register(&mbochs_dev);
 	if (ret)
-		goto failed2;
+		goto err_class;
 
 	ret = mdev_register_device(&mbochs_dev, &mdev_fops);
 	if (ret)
-		goto failed3;
+		goto err_device;
 
 	return 0;
 
-failed3:
+err_device:
 	device_unregister(&mbochs_dev);
-failed2:
+err_class:
 	class_destroy(mbochs_class);
-failed1:
+err_driver:
+	mdev_unregister_driver(&mbochs_driver);
+err_cdev:
 	cdev_del(&mbochs_cdev);
 	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
 	return ret;
@@ -1470,6 +1488,7 @@ static void __exit mbochs_dev_exit(void)
 	mdev_unregister_device(&mbochs_dev);
 
 	device_unregister(&mbochs_dev);
+	mdev_unregister_driver(&mbochs_driver);
 	cdev_del(&mbochs_cdev);
 	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
 	class_destroy(mbochs_class);
-- 
2.30.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH 10/10] vfio/mbochs: Convert to use vfio_register_group_dev()

[Christoph Hellwig]

From: Jason Gunthorpe <jgg@nvidia.com>

This is straightforward conversion, the mdev_state is actually serving as
the vfio_device and we can replace all the mdev_get_drvdata()'s and the
wonky dead code with a simple container_of().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 samples/vfio-mdev/mbochs.c | 163 +++++++++++++++++++++----------------
 1 file changed, 91 insertions(+), 72 deletions(-)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index 881ef9a7296f..6c0f229db36a 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -130,6 +130,7 @@ static struct class	*mbochs_class;
 static struct cdev	mbochs_cdev;
 static struct device	mbochs_dev;
 static int		mbochs_used_mbytes;
+static const struct vfio_device_ops mbochs_dev_ops;
 
 struct vfio_region_info_ext {
 	struct vfio_region_info          base;
@@ -160,6 +161,7 @@ struct mbochs_dmabuf {
 
 /* State of each mdev device */
 struct mdev_state {
+	struct vfio_device vdev;
 	u8 *vconfig;
 	u64 bar_mask[3];
 	u32 memory_bar_mask;
@@ -425,11 +427,9 @@ static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
 		memcpy(buf, mdev_state->edid_blob + offset, count);
 }
 
-static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
-			   loff_t pos, bool is_write)
+static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf,
+			   size_t count, loff_t pos, bool is_write)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
 	struct page *pg;
 	loff_t poff;
 	char *map;
@@ -478,7 +478,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 		put_page(pg);
 
 	} else {
-		dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
+		dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n",
 			__func__, is_write ? "WR" : "RD", pos);
 		ret = -1;
 		goto accessfailed;
@@ -493,9 +493,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 	return ret;
 }
 
-static int mbochs_reset(struct mdev_device *mdev)
+static int mbochs_reset(struct mdev_state *mdev_state)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 	u32 size64k = mdev_state->memsize / (64 * 1024);
 	int i;
 
@@ -506,12 +505,13 @@ static int mbochs_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mbochs_create(struct mdev_device *mdev)
+static int mbochs_probe(struct mdev_device *mdev)
 {
 	const struct mbochs_type *type =
 		&mbochs_types[mdev_get_type_group_id(mdev)];
 	struct device *dev = mdev_dev(mdev);
 	struct mdev_state *mdev_state;
+	int ret = -ENOMEM;
 
 	if (type->mbytes + mbochs_used_mbytes > max_mbytes)
 		return -ENOMEM;
@@ -519,6 +519,7 @@ static int mbochs_create(struct mdev_device *mdev)
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
 		return -ENOMEM;
+	vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops);
 
 	mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
 	if (mdev_state->vconfig == NULL)
@@ -537,7 +538,6 @@ static int mbochs_create(struct mdev_device *mdev)
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
-	mdev_set_drvdata(mdev, mdev_state);
 	INIT_LIST_HEAD(&mdev_state->dmabufs);
 	mdev_state->next_id = 1;
 
@@ -547,32 +547,38 @@ static int mbochs_create(struct mdev_device *mdev)
 	mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
 	mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
 	mbochs_create_config_space(mdev_state);
-	mbochs_reset(mdev);
+	mbochs_reset(mdev_state);
 
 	mbochs_used_mbytes += type->mbytes;
+
+	ret = vfio_register_group_dev(&mdev_state->vdev);
+	if (ret)
+		goto err_mem;
+	dev_set_drvdata(&mdev->dev, mdev_state);
 	return 0;
 
 err_mem:
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
-	return -ENOMEM;
+	return ret;
 }
 
-static int mbochs_remove(struct mdev_device *mdev)
+static void mbochs_remove(struct mdev_device *mdev)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 
 	mbochs_used_mbytes -= mdev_state->type->mbytes;
-	mdev_set_drvdata(mdev, NULL);
+	vfio_unregister_group_dev(&mdev_state->vdev);
 	kfree(mdev_state->pages);
 	kfree(mdev_state->vconfig);
 	kfree(mdev_state);
-	return 0;
 }
 
-static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
+static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf,
 			   size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -582,7 +588,7 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 		if (count >= 4 && !(*ppos % 4)) {
 			u32 val;
 
-			ret =  mdev_access(mdev, (char *)&val, sizeof(val),
+			ret =  mdev_access(mdev_state, (char *)&val, sizeof(val),
 					   *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -594,7 +600,7 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 		} else if (count >= 2 && !(*ppos % 2)) {
 			u16 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -606,7 +612,7 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 		} else {
 			u8 val;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, false);
 			if (ret <= 0)
 				goto read_err;
@@ -629,9 +635,11 @@ static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 	return -EFAULT;
 }
 
-static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
+static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf,
 			    size_t count, loff_t *ppos)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	unsigned int done = 0;
 	int ret;
 
@@ -644,7 +652,7 @@ static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -656,7 +664,7 @@ static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -668,7 +676,7 @@ static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
 			if (copy_from_user(&val, buf, sizeof(val)))
 				goto write_err;
 
-			ret = mdev_access(mdev, (char *)&val, sizeof(val),
+			ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 					  *ppos, true);
 			if (ret <= 0)
 				goto write_err;
@@ -754,9 +762,10 @@ static const struct vm_operations_struct mbochs_region_vm_ops = {
 	.fault = mbochs_region_vm_fault,
 };
 
-static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
+static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 
 	if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
 		return -EINVAL;
@@ -963,7 +972,7 @@ mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
 {
 	struct mdev_state *mdev_state = dmabuf->mdev_state;
-	struct device *dev = mdev_dev(mdev_state->mdev);
+	struct device *dev = mdev_state->vdev.dev;
 	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 	struct dma_buf *buf;
 
@@ -991,15 +1000,10 @@ static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
 	return 0;
 }
 
-static int mbochs_get_region_info(struct mdev_device *mdev,
+static int mbochs_get_region_info(struct mdev_state *mdev_state,
 				  struct vfio_region_info_ext *ext)
 {
 	struct vfio_region_info *region_info = &ext->base;
-	struct mdev_state *mdev_state;
-
-	mdev_state = mdev_get_drvdata(mdev);
-	if (!mdev_state)
-		return -EINVAL;
 
 	if (region_info->index >= MBOCHS_NUM_REGIONS)
 		return -EINVAL;
@@ -1047,15 +1051,13 @@ static int mbochs_get_region_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mbochs_get_irq_info(struct mdev_device *mdev,
-			       struct vfio_irq_info *irq_info)
+static int mbochs_get_irq_info(struct vfio_irq_info *irq_info)
 {
 	irq_info->count = 0;
 	return 0;
 }
 
-static int mbochs_get_device_info(struct mdev_device *mdev,
-				  struct vfio_device_info *dev_info)
+static int mbochs_get_device_info(struct vfio_device_info *dev_info)
 {
 	dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
 	dev_info->num_regions = MBOCHS_NUM_REGIONS;
@@ -1063,11 +1065,9 @@ static int mbochs_get_device_info(struct mdev_device *mdev,
 	return 0;
 }
 
-static int mbochs_query_gfx_plane(struct mdev_device *mdev,
+static int mbochs_query_gfx_plane(struct mdev_state *mdev_state,
 				  struct vfio_device_gfx_plane_info *plane)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
-	struct device *dev = mdev_dev(mdev);
 	struct mbochs_dmabuf *dmabuf;
 	struct mbochs_mode mode;
 	int ret;
@@ -1121,18 +1121,16 @@ static int mbochs_query_gfx_plane(struct mdev_device *mdev,
 done:
 	if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
 	    mdev_state->active_id != plane->dmabuf_id) {
-		dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
-			mdev_state->active_id, plane->dmabuf_id);
+		dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n",
+			__func__, mdev_state->active_id, plane->dmabuf_id);
 		mdev_state->active_id = plane->dmabuf_id;
 	}
 	mutex_unlock(&mdev_state->ops_lock);
 	return 0;
 }
 
-static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
-				 u32 id)
+static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 	struct mbochs_dmabuf *dmabuf;
 
 	mutex_lock(&mdev_state->ops_lock);
@@ -1154,9 +1152,11 @@ static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
 	return dma_buf_fd(dmabuf->buf, 0);
 }
 
-static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
-			unsigned long arg)
+static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
+			 unsigned long arg)
 {
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	int ret = 0;
 	unsigned long minsz, outsz;
 
@@ -1173,7 +1173,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		ret = mbochs_get_device_info(mdev, &info);
+		ret = mbochs_get_device_info(&info);
 		if (ret)
 			return ret;
 
@@ -1197,7 +1197,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (outsz > sizeof(info))
 			return -EINVAL;
 
-		ret = mbochs_get_region_info(mdev, &info);
+		ret = mbochs_get_region_info(mdev_state, &info);
 		if (ret)
 			return ret;
 
@@ -1220,7 +1220,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		    (info.index >= VFIO_PCI_NUM_IRQS))
 			return -EINVAL;
 
-		ret = mbochs_get_irq_info(mdev, &info);
+		ret = mbochs_get_irq_info(&info);
 		if (ret)
 			return ret;
 
@@ -1243,7 +1243,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (plane.argsz < minsz)
 			return -EINVAL;
 
-		ret = mbochs_query_gfx_plane(mdev, &plane);
+		ret = mbochs_query_gfx_plane(mdev_state, &plane);
 		if (ret)
 			return ret;
 
@@ -1260,19 +1260,19 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (get_user(dmabuf_id, (__u32 __user *)arg))
 			return -EFAULT;
 
-		return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
+		return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id);
 	}
 
 	case VFIO_DEVICE_SET_IRQS:
 		return -EINVAL;
 
 	case VFIO_DEVICE_RESET:
-		return mbochs_reset(mdev);
+		return mbochs_reset(mdev_state);
 	}
 	return -ENOTTY;
 }
 
-static int mbochs_open(struct mdev_device *mdev)
+static int mbochs_open(struct vfio_device *vdev)
 {
 	if (!try_module_get(THIS_MODULE))
 		return -ENODEV;
@@ -1280,9 +1280,10 @@ static int mbochs_open(struct mdev_device *mdev)
 	return 0;
 }
 
-static void mbochs_close(struct mdev_device *mdev)
+static void mbochs_close(struct vfio_device *vdev)
 {
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state =
+		container_of(vdev, struct mdev_state, vdev);
 	struct mbochs_dmabuf *dmabuf, *tmp;
 
 	mutex_lock(&mdev_state->ops_lock);
@@ -1306,8 +1307,7 @@ static ssize_t
 memory_show(struct device *dev, struct device_attribute *attr,
 	    char *buf)
 {
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
+	struct mdev_state *mdev_state = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
 }
@@ -1398,18 +1398,30 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
+static const struct vfio_device_ops mbochs_dev_ops = {
+	.open = mbochs_open,
+	.release = mbochs_close,
+	.read = mbochs_read,
+	.write = mbochs_write,
+	.ioctl = mbochs_ioctl,
+	.mmap = mbochs_mmap,
+};
+
+static struct mdev_driver mbochs_driver = {
+	.driver = {
+		.name = "mbochs",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+		.dev_groups = mdev_dev_groups,
+	},
+	.probe = mbochs_probe,
+	.remove	= mbochs_remove,
+};
+
 static const struct mdev_parent_ops mdev_fops = {
 	.owner			= THIS_MODULE,
-	.mdev_attr_groups	= mdev_dev_groups,
+	.device_driver		= &mbochs_driver,
 	.supported_type_groups	= mdev_type_groups,
-	.create			= mbochs_create,
-	.remove			= mbochs_remove,
-	.open			= mbochs_open,
-	.release		= mbochs_close,
-	.read			= mbochs_read,
-	.write			= mbochs_write,
-	.ioctl			= mbochs_ioctl,
-	.mmap			= mbochs_mmap,
 };
 
 static const struct file_operations vd_fops = {
@@ -1434,11 +1446,15 @@ static int __init mbochs_dev_init(void)
 	cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
 	pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
 
+	ret = mdev_register_driver(&mbochs_driver);
+	if (ret)
+		goto err_cdev;
+
 	mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
 	if (IS_ERR(mbochs_class)) {
 		pr_err("Error: failed to register mbochs_dev class\n");
 		ret = PTR_ERR(mbochs_class);
-		goto failed1;
+		goto err_driver;
 	}
 	mbochs_dev.class = mbochs_class;
 	mbochs_dev.release = mbochs_device_release;
@@ -1446,19 +1462,21 @@ static int __init mbochs_dev_init(void)
 
 	ret = device_register(&mbochs_dev);
 	if (ret)
-		goto failed2;
+		goto err_class;
 
 	ret = mdev_register_device(&mbochs_dev, &mdev_fops);
 	if (ret)
-		goto failed3;
+		goto err_device;
 
 	return 0;
 
-failed3:
+err_device:
 	device_unregister(&mbochs_dev);
-failed2:
+err_class:
 	class_destroy(mbochs_class);
-failed1:
+err_driver:
+	mdev_unregister_driver(&mbochs_driver);
+err_cdev:
 	cdev_del(&mbochs_cdev);
 	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
 	return ret;
@@ -1470,6 +1488,7 @@ static void __exit mbochs_dev_exit(void)
 	mdev_unregister_device(&mbochs_dev);
 
 	device_unregister(&mbochs_dev);
+	mdev_unregister_driver(&mbochs_driver);
 	cdev_del(&mbochs_cdev);
 	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
 	class_destroy(mbochs_class);
-- 
2.30.2

[Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/10] driver core: Pull required checks into driver_probe_device()

[Patchwork]

== Series Details ==

Series: series starting with [01/10] driver core: Pull required checks into driver_probe_device()
URL   : https://patchwork.freedesktop.org/series/91461/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
852f63054431 driver core: Pull required checks into driver_probe_device()
-:112: WARNING:FROM_SIGN_OFF_MISMATCH: From:/Signed-off-by: email address mismatch: 'From: Jason Gunthorpe <jgg@ziepe.ca>' != 'Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>'

total: 0 errors, 1 warnings, 0 checks, 70 lines checked
ef5a88420ec4 driver core: Better distinguish probe errors in really_probe
-:22: CHECK:LINE_SPACING: Please don't use multiple blank lines
#22: FILE: drivers/base/dd.c:516:
 
+

-:80: WARNING:BLOCK_COMMENT_STYLE: Block comments should align the * on each line
#80: FILE: drivers/base/dd.c:610:
+		 * try its luck.
+		   */

-:83: ERROR:TRAILING_WHITESPACE: trailing whitespace
#83: FILE: drivers/base/dd.c:613:
+^I} $

total: 1 errors, 1 warnings, 1 checks, 96 lines checked
1f1af497f5c8 driver core: Flow the return code from ->probe() through to sysfs bind
e8c231416c28 driver core: Don't return EPROBE_DEFER to userspace during sysfs bind
4da5f45f608f driver core: Export device_driver_attach()
-:75: WARNING:FROM_SIGN_OFF_MISMATCH: From:/Signed-off-by: email address mismatch: 'From: Jason Gunthorpe <jgg@ziepe.ca>' != 'Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>'

total: 0 errors, 1 warnings, 0 checks, 30 lines checked
482cbc50b749 vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE
-:203: WARNING:FROM_SIGN_OFF_MISMATCH: From:/Signed-off-by: email address mismatch: 'From: Jason Gunthorpe <jgg@ziepe.ca>' != 'Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>'

total: 0 errors, 1 warnings, 0 checks, 113 lines checked
6f9eaa31f051 vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind
-:138: WARNING:FROM_SIGN_OFF_MISMATCH: From:/Signed-off-by: email address mismatch: 'From: Jason Gunthorpe <jgg@ziepe.ca>' != 'Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>'

total: 0 errors, 1 warnings, 0 checks, 99 lines checked
80b0203c9f8d vfio/mtty: Convert to use vfio_register_group_dev()
-:188: CHECK:PARENTHESIS_ALIGNMENT: Alignment should match open parenthesis
#188: FILE: samples/vfio-mdev/mtty.c:831:
+static ssize_t mtty_write(struct vfio_device *vdev, const char __user *buf,
 		   size_t count, loff_t *ppos)

-:249: CHECK:PARENTHESIS_ALIGNMENT: Alignment should match open parenthesis
#249: FILE: samples/vfio-mdev/mtty.c:1010:
+static int mtty_get_region_info(struct mdev_state *mdev_state,
 			 struct vfio_region_info *region_info,

-:292: CHECK:PARENTHESIS_ALIGNMENT: Alignment should match open parenthesis
#292: FILE: samples/vfio-mdev/mtty.c:1084:
+static long mtty_ioctl(struct vfio_device *vdev, unsigned int cmd,
 			unsigned long arg)

-:468: WARNING:FROM_SIGN_OFF_MISMATCH: From:/Signed-off-by: email address mismatch: 'From: Jason Gunthorpe <jgg@ziepe.ca>' != 'Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>'

total: 0 errors, 1 warnings, 3 checks, 425 lines checked
4f7da4e54687 vfio/mdpy: Convert to use vfio_register_group_dev()
-:122: WARNING:TRACING_LOGGING: Unnecessary ftrace-like logging - prefer using ftrace
#122: FILE: samples/vfio-mdev/mdpy.c:275:
+	dev_info(&mdev->dev, "%s\n", __func__);

-:453: WARNING:FROM_SIGN_OFF_MISMATCH: From:/Signed-off-by: email address mismatch: 'From: Jason Gunthorpe <jgg@ziepe.ca>' != 'Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>'

total: 0 errors, 2 warnings, 0 checks, 406 lines checked
07ce69ccb020 vfio/mbochs: Convert to use vfio_register_group_dev()
-:491: WARNING:FROM_SIGN_OFF_MISMATCH: From:/Signed-off-by: email address mismatch: 'From: Jason Gunthorpe <jgg@ziepe.ca>' != 'Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>'

total: 0 errors, 1 warnings, 0 checks, 440 lines checked


_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] ✗ Fi.CI.SPARSE: warning for series starting with [01/10] driver core: Pull required checks into driver_probe_device()

[Patchwork]

== Series Details ==

Series: series starting with [01/10] driver core: Pull required checks into driver_probe_device()
URL   : https://patchwork.freedesktop.org/series/91461/
State : warning

== Summary ==

$ dim sparse --fast origin/drm-tip
Sparse version: v0.6.2
Fast mode used, each commit won't be checked separately.
-
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgv_sriovmsg.h:316:49: error: static assertion failed: "amd_sriov_msg_pf2vf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1345:25: error: incompatible types in comparison expression (different address spaces):
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1345:25:    struct dma_fence *
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1345:25:    struct dma_fence [noderef] __rcu *
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1346:17: error: incompatible types in comparison expression (different address spaces):
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1346:17:    struct dma_fence *
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1346:17:    struct dma_fence [noderef] __rcu *
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1405:17: error: incompatible types in comparison expression (different address spaces):
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1405:17:    struct dma_fence *
+drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c:1405:17:    struct dma_fence [noderef] __rcu *
+drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:310:16: error: incompatible types in comparison expression (different type sizes):
+drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:310:16:    unsigned long *
+drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:310:16:    unsigned long long *
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:275:25: error: incompatible types in comparison expression (different address spaces):
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:275:25:    struct dma_fence *
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:275:25:    struct dma_fence [noderef] __rcu *
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:276:17: error: incompatible types in comparison expression (different address spaces):
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:276:17:    struct dma_fence *
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:276:17:    struct dma_fence [noderef] __rcu *
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:330:17: error: incompatible types in comparison expression (different address spaces):
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:330:17:    struct dma_fence *
+drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:330:17:    struct dma_fence [noderef] __rcu *
+drivers/gpu/drm/amd/amdgpu/amdgpu_ioc32.c:37:6: warning: symbol 'amdgpu_kms_compat_ioctl' was not declared. Should it be static?
+drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h:90:56: error: marked inline, but without a definition
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49: error: static assertion failed: "amd_sriov_msg_vf2pf_info must be 1 KB"
+drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h:312:49:


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[Intel-gfx] ✓ Fi.CI.BAT: success for series starting with [01/10] driver core: Pull required checks into driver_probe_device()

[Patchwork]

[-- Attachment #1.1: Type: text/plain, Size: 5175 bytes --]

== Series Details ==

Series: series starting with [01/10] driver core: Pull required checks into driver_probe_device()
URL   : https://patchwork.freedesktop.org/series/91461/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_10222 -> Patchwork_20361
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/index.html

Known issues
------------

  Here are the changes found in Patchwork_20361 that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@amdgpu/amd_prime@i915-to-amd:
    - fi-kbl-soraka:      NOTRUN -> [SKIP][1] ([fdo#109271]) +1 similar issue
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/fi-kbl-soraka/igt@amdgpu/amd_prime@i915-to-amd.html

  * igt@kms_chamelium@common-hpd-after-suspend:
    - fi-skl-6700k2:      [PASS][2] -> [INCOMPLETE][3] ([i915#146] / [i915#2405])
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/fi-skl-6700k2/igt@kms_chamelium@common-hpd-after-suspend.html
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/fi-skl-6700k2/igt@kms_chamelium@common-hpd-after-suspend.html

  * igt@kms_chamelium@hdmi-hpd-fast:
    - fi-icl-u2:          [PASS][4] -> [DMESG-WARN][5] ([i915#2203] / [i915#2868])
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/fi-icl-u2/igt@kms_chamelium@hdmi-hpd-fast.html
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/fi-icl-u2/igt@kms_chamelium@hdmi-hpd-fast.html

  
#### Possible fixes ####

  * igt@i915_pm_rpm@module-reload:
    - fi-kbl-guc:         [SKIP][6] ([fdo#109271]) -> [PASS][7]
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/fi-kbl-guc/igt@i915_pm_rpm@module-reload.html
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/fi-kbl-guc/igt@i915_pm_rpm@module-reload.html

  * igt@i915_selftest@live@hangcheck:
    - {fi-hsw-gt1}:       [DMESG-WARN][8] ([i915#3303]) -> [PASS][9]
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/fi-hsw-gt1/igt@i915_selftest@live@hangcheck.html
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/fi-hsw-gt1/igt@i915_selftest@live@hangcheck.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [fdo#109285]: https://bugs.freedesktop.org/show_bug.cgi?id=109285
  [fdo#109315]: https://bugs.freedesktop.org/show_bug.cgi?id=109315
  [fdo#111827]: https://bugs.freedesktop.org/show_bug.cgi?id=111827
  [i915#1072]: https://gitlab.freedesktop.org/drm/intel/issues/1072
  [i915#146]: https://gitlab.freedesktop.org/drm/intel/issues/146
  [i915#2190]: https://gitlab.freedesktop.org/drm/intel/issues/2190
  [i915#2203]: https://gitlab.freedesktop.org/drm/intel/issues/2203
  [i915#2405]: https://gitlab.freedesktop.org/drm/intel/issues/2405
  [i915#2868]: https://gitlab.freedesktop.org/drm/intel/issues/2868
  [i915#3012]: https://gitlab.freedesktop.org/drm/intel/issues/3012
  [i915#3276]: https://gitlab.freedesktop.org/drm/intel/issues/3276
  [i915#3277]: https://gitlab.freedesktop.org/drm/intel/issues/3277
  [i915#3282]: https://gitlab.freedesktop.org/drm/intel/issues/3282
  [i915#3283]: https://gitlab.freedesktop.org/drm/intel/issues/3283
  [i915#3303]: https://gitlab.freedesktop.org/drm/intel/issues/3303
  [i915#3539]: https://gitlab.freedesktop.org/drm/intel/issues/3539
  [i915#3542]: https://gitlab.freedesktop.org/drm/intel/issues/3542
  [i915#3544]: https://gitlab.freedesktop.org/drm/intel/issues/3544
  [i915#533]: https://gitlab.freedesktop.org/drm/intel/issues/533


Participating hosts (42 -> 39)
------------------------------

  Additional (1): fi-rkl-11500t 
  Missing    (4): fi-ilk-m540 fi-bsw-cyan fi-bdw-samus fi-hsw-4200u 


Build changes
-------------

  * Linux: CI_DRM_10222 -> Patchwork_20361

  CI-20190529: 20190529
  CI_DRM_10222: 9b5675dc51137543709a5ec444b0d7076e43198e @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_6105: 598a154680374e7875ae9ffc98425abc57398b2f @ https://gitlab.freedesktop.org/drm/igt-gpu-tools.git
  Patchwork_20361: 07ce69ccb0204feceec6f852b631593453c9649d @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

07ce69ccb020 vfio/mbochs: Convert to use vfio_register_group_dev()
4f7da4e54687 vfio/mdpy: Convert to use vfio_register_group_dev()
80b0203c9f8d vfio/mtty: Convert to use vfio_register_group_dev()
6f9eaa31f051 vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind
482cbc50b749 vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE
4da5f45f608f driver core: Export device_driver_attach()
e8c231416c28 driver core: Don't return EPROBE_DEFER to userspace during sysfs bind
1f1af497f5c8 driver core: Flow the return code from ->probe() through to sysfs bind
ef5a88420ec4 driver core: Better distinguish probe errors in really_probe
852f63054431 driver core: Pull required checks into driver_probe_device()

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/index.html

[-- Attachment #1.2: Type: text/html, Size: 5081 bytes --]

[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

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Re: [Intel-gfx] Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:36PM +0200, Christoph Hellwig wrote:
> This is my alternative take on this series from Jason:
> 
> https://lore.kernel.org/dri-devel/87czsszi9i.fsf@redhat.com/T/
> 
> The mdev/vfio parts are exactly the same, but this solves the driver core
> changes for the direct probing without the in/out flag that Greg hated,
> which cause a little more work, but probably make the result better.
> 
> Original decription from Jason below:
> 
> The mdev bus's core part for managing the lifecycle of devices is mostly
> as one would expect for a driver core bus subsystem.
> 
> However instead of having a normal 'struct device_driver' and binding the
> actual mdev drivers through the standard driver core mechanisms it open
> codes this with the struct mdev_parent_ops and provides a single driver
> that shims between the VFIO core's struct vfio_device and the actual
> device driver.
> 
> Instead, allow mdev drivers implement an actual struct mdev_driver and
> directly call vfio_register_group_dev() in the probe() function for the
> mdev. Arrange to bind the created mdev_device to the mdev_driver that is
> provided by the end driver.
> 
> The actual execution flow doesn't change much, eg what was
> parent_ops->create is now device_driver->probe and it is called at almost
> the exact same time - except under the normal control of the driver core.
> 
> Ultimately converting all the drivers unlocks a fair number of additional
> VFIO simplifications and cleanups.

This looks much better as far as the driver core changes go, thank you
for doing this.

I'm guessing there will be at least one more revision of this.  Do you
want this to go through my driver core tree or is there a mdev tree it
should go through?  Either is fine for me.

thanks,

greg k-h
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Re: Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:36PM +0200, Christoph Hellwig wrote:
> This is my alternative take on this series from Jason:
> 
> https://lore.kernel.org/dri-devel/87czsszi9i.fsf@redhat.com/T/
> 
> The mdev/vfio parts are exactly the same, but this solves the driver core
> changes for the direct probing without the in/out flag that Greg hated,
> which cause a little more work, but probably make the result better.
> 
> Original decription from Jason below:
> 
> The mdev bus's core part for managing the lifecycle of devices is mostly
> as one would expect for a driver core bus subsystem.
> 
> However instead of having a normal 'struct device_driver' and binding the
> actual mdev drivers through the standard driver core mechanisms it open
> codes this with the struct mdev_parent_ops and provides a single driver
> that shims between the VFIO core's struct vfio_device and the actual
> device driver.
> 
> Instead, allow mdev drivers implement an actual struct mdev_driver and
> directly call vfio_register_group_dev() in the probe() function for the
> mdev. Arrange to bind the created mdev_device to the mdev_driver that is
> provided by the end driver.
> 
> The actual execution flow doesn't change much, eg what was
> parent_ops->create is now device_driver->probe and it is called at almost
> the exact same time - except under the normal control of the driver core.
> 
> Ultimately converting all the drivers unlocks a fair number of additional
> VFIO simplifications and cleanups.

This looks much better as far as the driver core changes go, thank you
for doing this.

I'm guessing there will be at least one more revision of this.  Do you
want this to go through my driver core tree or is there a mdev tree it
should go through?  Either is fine for me.

thanks,

greg k-h

Re: Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Greg Kroah-Hartman]

On Mon, Jun 14, 2021 at 05:08:36PM +0200, Christoph Hellwig wrote:
> This is my alternative take on this series from Jason:
> 
> https://lore.kernel.org/dri-devel/87czsszi9i.fsf@redhat.com/T/
> 
> The mdev/vfio parts are exactly the same, but this solves the driver core
> changes for the direct probing without the in/out flag that Greg hated,
> which cause a little more work, but probably make the result better.
> 
> Original decription from Jason below:
> 
> The mdev bus's core part for managing the lifecycle of devices is mostly
> as one would expect for a driver core bus subsystem.
> 
> However instead of having a normal 'struct device_driver' and binding the
> actual mdev drivers through the standard driver core mechanisms it open
> codes this with the struct mdev_parent_ops and provides a single driver
> that shims between the VFIO core's struct vfio_device and the actual
> device driver.
> 
> Instead, allow mdev drivers implement an actual struct mdev_driver and
> directly call vfio_register_group_dev() in the probe() function for the
> mdev. Arrange to bind the created mdev_device to the mdev_driver that is
> provided by the end driver.
> 
> The actual execution flow doesn't change much, eg what was
> parent_ops->create is now device_driver->probe and it is called at almost
> the exact same time - except under the normal control of the driver core.
> 
> Ultimately converting all the drivers unlocks a fair number of additional
> VFIO simplifications and cleanups.

This looks much better as far as the driver core changes go, thank you
for doing this.

I'm guessing there will be at least one more revision of this.  Do you
want this to go through my driver core tree or is there a mdev tree it
should go through?  Either is fine for me.

thanks,

greg k-h

Re: [Intel-gfx] Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Christoph Hellwig]

On Tue, Jun 15, 2021 at 07:21:57AM +0200, Greg Kroah-Hartman wrote:
> This looks much better as far as the driver core changes go, thank you
> for doing this.
> 
> I'm guessing there will be at least one more revision of this.

Yes.

> Do you
> want this to go through my driver core tree or is there a mdev tree it
> should go through?  Either is fine for me.

Either way is fine with me.  Alex, do you have a preference?
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Re: Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Christoph Hellwig]

On Tue, Jun 15, 2021 at 07:21:57AM +0200, Greg Kroah-Hartman wrote:
> This looks much better as far as the driver core changes go, thank you
> for doing this.
> 
> I'm guessing there will be at least one more revision of this.

Yes.

> Do you
> want this to go through my driver core tree or is there a mdev tree it
> should go through?  Either is fine for me.

Either way is fine with me.  Alex, do you have a preference?

Re: [Intel-gfx] Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Jason Gunthorpe]

On Tue, Jun 15, 2021 at 07:50:21AM +0200, Christoph Hellwig wrote:
> On Tue, Jun 15, 2021 at 07:21:57AM +0200, Greg Kroah-Hartman wrote:
> > This looks much better as far as the driver core changes go, thank you
> > for doing this.
> > 
> > I'm guessing there will be at least one more revision of this.
> 
> Yes.
> 
> > Do you
> > want this to go through my driver core tree or is there a mdev tree it
> > should go through?  Either is fine for me.
> 
> Either way is fine with me.  Alex, do you have a preference?

I would prefer to see it go to Alex's tree since there are more vfio
patches following this that might get to this merge window.

If you want the driver core part on a branch you can pull/etc I can
organize that.

Jason
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Re: Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Jason Gunthorpe]

On Tue, Jun 15, 2021 at 07:50:21AM +0200, Christoph Hellwig wrote:
> On Tue, Jun 15, 2021 at 07:21:57AM +0200, Greg Kroah-Hartman wrote:
> > This looks much better as far as the driver core changes go, thank you
> > for doing this.
> > 
> > I'm guessing there will be at least one more revision of this.
> 
> Yes.
> 
> > Do you
> > want this to go through my driver core tree or is there a mdev tree it
> > should go through?  Either is fine for me.
> 
> Either way is fine with me.  Alex, do you have a preference?

I would prefer to see it go to Alex's tree since there are more vfio
patches following this that might get to this merge window.

If you want the driver core part on a branch you can pull/etc I can
organize that.

Jason

Re: Allow mdev drivers to directly create the vfio_device (v2 / alternative)

[Jason Gunthorpe]

On Tue, Jun 15, 2021 at 07:50:21AM +0200, Christoph Hellwig wrote:
> On Tue, Jun 15, 2021 at 07:21:57AM +0200, Greg Kroah-Hartman wrote:
> > This looks much better as far as the driver core changes go, thank you
> > for doing this.
> > 
> > I'm guessing there will be at least one more revision of this.
> 
> Yes.
> 
> > Do you
> > want this to go through my driver core tree or is there a mdev tree it
> > should go through?  Either is fine for me.
> 
> Either way is fine with me.  Alex, do you have a preference?

I would prefer to see it go to Alex's tree since there are more vfio
patches following this that might get to this merge window.

If you want the driver core part on a branch you can pull/etc I can
organize that.

Jason

[Intel-gfx] ✓ Fi.CI.IGT: success for series starting with [01/10] driver core: Pull required checks into driver_probe_device()

[Patchwork]

[-- Attachment #1.1: Type: text/plain, Size: 30312 bytes --]

== Series Details ==

Series: series starting with [01/10] driver core: Pull required checks into driver_probe_device()
URL   : https://patchwork.freedesktop.org/series/91461/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_10222_full -> Patchwork_20361_full
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  

Known issues
------------

  Here are the changes found in Patchwork_20361_full that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@gem_ctx_persistence@legacy-engines-queued:
    - shard-snb:          NOTRUN -> [SKIP][1] ([fdo#109271] / [i915#1099]) +4 similar issues
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb6/igt@gem_ctx_persistence@legacy-engines-queued.html

  * igt@gem_eio@in-flight-contexts-10ms:
    - shard-tglb:         [PASS][2] -> [TIMEOUT][3] ([i915#3063])
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-tglb2/igt@gem_eio@in-flight-contexts-10ms.html
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-tglb8/igt@gem_eio@in-flight-contexts-10ms.html

  * igt@gem_eio@in-flight-suspend:
    - shard-kbl:          [PASS][4] -> [DMESG-WARN][5] ([i915#180]) +1 similar issue
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl7/igt@gem_eio@in-flight-suspend.html
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl6/igt@gem_eio@in-flight-suspend.html

  * igt@gem_exec_fair@basic-deadline:
    - shard-apl:          NOTRUN -> [FAIL][6] ([i915#2846])
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl7/igt@gem_exec_fair@basic-deadline.html

  * igt@gem_exec_fair@basic-none@rcs0:
    - shard-glk:          [PASS][7] -> [FAIL][8] ([i915#2842]) +1 similar issue
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-glk8/igt@gem_exec_fair@basic-none@rcs0.html
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-glk2/igt@gem_exec_fair@basic-none@rcs0.html

  * igt@gem_exec_fair@basic-none@vcs0:
    - shard-kbl:          NOTRUN -> [FAIL][9] ([i915#2842]) +3 similar issues
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl4/igt@gem_exec_fair@basic-none@vcs0.html

  * igt@gem_exec_fair@basic-pace-share@rcs0:
    - shard-tglb:         [PASS][10] -> [FAIL][11] ([i915#2842]) +2 similar issues
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-tglb2/igt@gem_exec_fair@basic-pace-share@rcs0.html
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-tglb8/igt@gem_exec_fair@basic-pace-share@rcs0.html

  * igt@gem_exec_fair@basic-pace@vcs1:
    - shard-iclb:         NOTRUN -> [FAIL][12] ([i915#2842])
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb1/igt@gem_exec_fair@basic-pace@vcs1.html

  * igt@gem_exec_fair@basic-throttle@rcs0:
    - shard-iclb:         [PASS][13] -> [FAIL][14] ([i915#2849])
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb2/igt@gem_exec_fair@basic-throttle@rcs0.html
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb3/igt@gem_exec_fair@basic-throttle@rcs0.html

  * igt@gem_exec_reloc@basic-wide-active@rcs0:
    - shard-snb:          NOTRUN -> [FAIL][15] ([i915#2389]) +2 similar issues
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb6/igt@gem_exec_reloc@basic-wide-active@rcs0.html

  * igt@gem_exec_reloc@basic-wide-active@vcs1:
    - shard-iclb:         NOTRUN -> [FAIL][16] ([i915#2389])
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb1/igt@gem_exec_reloc@basic-wide-active@vcs1.html

  * igt@gem_exec_whisper@basic-forked:
    - shard-glk:          [PASS][17] -> [DMESG-WARN][18] ([i915#118] / [i915#95])
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-glk5/igt@gem_exec_whisper@basic-forked.html
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-glk3/igt@gem_exec_whisper@basic-forked.html

  * igt@gem_mmap_gtt@big-copy:
    - shard-glk:          [PASS][19] -> [FAIL][20] ([i915#307]) +2 similar issues
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-glk2/igt@gem_mmap_gtt@big-copy.html
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-glk7/igt@gem_mmap_gtt@big-copy.html

  * igt@gem_pread@exhaustion:
    - shard-apl:          NOTRUN -> [WARN][21] ([i915#2658])
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl6/igt@gem_pread@exhaustion.html

  * igt@gem_userptr_blits@dmabuf-sync:
    - shard-apl:          NOTRUN -> [SKIP][22] ([fdo#109271] / [i915#3323])
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl1/igt@gem_userptr_blits@dmabuf-sync.html

  * igt@gen9_exec_parse@allowed-single:
    - shard-skl:          [PASS][23] -> [DMESG-WARN][24] ([i915#1436] / [i915#716])
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl5/igt@gen9_exec_parse@allowed-single.html
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl6/igt@gen9_exec_parse@allowed-single.html

  * igt@gen9_exec_parse@bb-large:
    - shard-apl:          NOTRUN -> [FAIL][25] ([i915#3296])
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl7/igt@gen9_exec_parse@bb-large.html

  * igt@i915_pm_rpm@system-suspend-modeset:
    - shard-skl:          [PASS][26] -> [INCOMPLETE][27] ([i915#151])
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl10/igt@i915_pm_rpm@system-suspend-modeset.html
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl7/igt@i915_pm_rpm@system-suspend-modeset.html

  * igt@kms_chamelium@hdmi-audio-edid:
    - shard-kbl:          NOTRUN -> [SKIP][28] ([fdo#109271] / [fdo#111827]) +6 similar issues
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl7/igt@kms_chamelium@hdmi-audio-edid.html

  * igt@kms_chamelium@vga-hpd-without-ddc:
    - shard-snb:          NOTRUN -> [SKIP][29] ([fdo#109271] / [fdo#111827]) +27 similar issues
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb7/igt@kms_chamelium@vga-hpd-without-ddc.html

  * igt@kms_color@pipe-b-ctm-0-5:
    - shard-skl:          [PASS][30] -> [DMESG-WARN][31] ([i915#1982])
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl10/igt@kms_color@pipe-b-ctm-0-5.html
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl7/igt@kms_color@pipe-b-ctm-0-5.html

  * igt@kms_color_chamelium@pipe-a-ctm-limited-range:
    - shard-apl:          NOTRUN -> [SKIP][32] ([fdo#109271] / [fdo#111827]) +34 similar issues
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl7/igt@kms_color_chamelium@pipe-a-ctm-limited-range.html

  * igt@kms_content_protection@lic:
    - shard-apl:          NOTRUN -> [TIMEOUT][33] ([i915#1319]) +1 similar issue
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl6/igt@kms_content_protection@lic.html

  * igt@kms_content_protection@uevent:
    - shard-apl:          NOTRUN -> [FAIL][34] ([i915#2105])
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl7/igt@kms_content_protection@uevent.html

  * igt@kms_cursor_crc@pipe-b-cursor-size-change:
    - shard-skl:          [PASS][35] -> [FAIL][36] ([i915#3444]) +1 similar issue
   [35]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl9/igt@kms_cursor_crc@pipe-b-cursor-size-change.html
   [36]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl8/igt@kms_cursor_crc@pipe-b-cursor-size-change.html

  * igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions:
    - shard-skl:          [PASS][37] -> [FAIL][38] ([i915#2346])
   [37]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl10/igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions.html
   [38]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl10/igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions.html

  * igt@kms_cursor_legacy@pipe-d-torture-bo:
    - shard-apl:          NOTRUN -> [SKIP][39] ([fdo#109271] / [i915#533]) +2 similar issues
   [39]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl2/igt@kms_cursor_legacy@pipe-d-torture-bo.html

  * igt@kms_draw_crc@draw-method-rgb565-blt-xtiled:
    - shard-snb:          [PASS][40] -> [SKIP][41] ([fdo#109271]) +3 similar issues
   [40]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-snb2/igt@kms_draw_crc@draw-method-rgb565-blt-xtiled.html
   [41]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb5/igt@kms_draw_crc@draw-method-rgb565-blt-xtiled.html

  * igt@kms_flip@2x-plain-flip-ts-check@ab-hdmi-a1-hdmi-a2:
    - shard-glk:          [PASS][42] -> [FAIL][43] ([i915#2122])
   [42]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-glk8/igt@kms_flip@2x-plain-flip-ts-check@ab-hdmi-a1-hdmi-a2.html
   [43]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-glk1/igt@kms_flip@2x-plain-flip-ts-check@ab-hdmi-a1-hdmi-a2.html

  * igt@kms_flip@flip-vs-expired-vblank@a-edp1:
    - shard-skl:          [PASS][44] -> [FAIL][45] ([i915#79])
   [44]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl7/igt@kms_flip@flip-vs-expired-vblank@a-edp1.html
   [45]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl8/igt@kms_flip@flip-vs-expired-vblank@a-edp1.html

  * igt@kms_frontbuffer_tracking@fbc-suspend:
    - shard-apl:          [PASS][46] -> [DMESG-WARN][47] ([i915#180])
   [46]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-apl8/igt@kms_frontbuffer_tracking@fbc-suspend.html
   [47]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl1/igt@kms_frontbuffer_tracking@fbc-suspend.html

  * igt@kms_frontbuffer_tracking@psr-2p-primscrn-pri-indfb-draw-mmap-wc:
    - shard-skl:          NOTRUN -> [SKIP][48] ([fdo#109271]) +2 similar issues
   [48]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl9/igt@kms_frontbuffer_tracking@psr-2p-primscrn-pri-indfb-draw-mmap-wc.html

  * igt@kms_hdr@bpc-switch-dpms:
    - shard-skl:          [PASS][49] -> [FAIL][50] ([i915#1188]) +1 similar issue
   [49]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl6/igt@kms_hdr@bpc-switch-dpms.html
   [50]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl6/igt@kms_hdr@bpc-switch-dpms.html

  * igt@kms_plane_alpha_blend@pipe-a-alpha-basic:
    - shard-apl:          NOTRUN -> [FAIL][51] ([fdo#108145] / [i915#265]) +2 similar issues
   [51]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl1/igt@kms_plane_alpha_blend@pipe-a-alpha-basic.html

  * igt@kms_plane_alpha_blend@pipe-a-alpha-transparent-fb:
    - shard-apl:          NOTRUN -> [FAIL][52] ([i915#265])
   [52]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl6/igt@kms_plane_alpha_blend@pipe-a-alpha-transparent-fb.html

  * igt@kms_plane_alpha_blend@pipe-c-alpha-basic:
    - shard-kbl:          NOTRUN -> [FAIL][53] ([fdo#108145] / [i915#265])
   [53]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl6/igt@kms_plane_alpha_blend@pipe-c-alpha-basic.html

  * igt@kms_plane_multiple@atomic-pipe-d-tiling-x:
    - shard-kbl:          NOTRUN -> [SKIP][54] ([fdo#109271]) +118 similar issues
   [54]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl6/igt@kms_plane_multiple@atomic-pipe-d-tiling-x.html

  * igt@kms_plane_scaling@scaler-with-clipping-clamping@pipe-c-scaler-with-clipping-clamping:
    - shard-apl:          NOTRUN -> [SKIP][55] ([fdo#109271] / [i915#2733])
   [55]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl2/igt@kms_plane_scaling@scaler-with-clipping-clamping@pipe-c-scaler-with-clipping-clamping.html

  * igt@kms_psr2_sf@overlay-plane-update-sf-dmg-area-4:
    - shard-apl:          NOTRUN -> [SKIP][56] ([fdo#109271] / [i915#658]) +5 similar issues
   [56]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl3/igt@kms_psr2_sf@overlay-plane-update-sf-dmg-area-4.html
    - shard-kbl:          NOTRUN -> [SKIP][57] ([fdo#109271] / [i915#658]) +3 similar issues
   [57]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl4/igt@kms_psr2_sf@overlay-plane-update-sf-dmg-area-4.html

  * igt@kms_psr@psr2_sprite_mmap_cpu:
    - shard-iclb:         [PASS][58] -> [SKIP][59] ([fdo#109441]) +1 similar issue
   [58]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb2/igt@kms_psr@psr2_sprite_mmap_cpu.html
   [59]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb3/igt@kms_psr@psr2_sprite_mmap_cpu.html

  * igt@kms_vblank@pipe-d-query-forked-hang:
    - shard-snb:          NOTRUN -> [SKIP][60] ([fdo#109271]) +502 similar issues
   [60]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb6/igt@kms_vblank@pipe-d-query-forked-hang.html

  * igt@kms_vblank@pipe-d-ts-continuation-idle:
    - shard-apl:          NOTRUN -> [SKIP][61] ([fdo#109271]) +355 similar issues
   [61]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl1/igt@kms_vblank@pipe-d-ts-continuation-idle.html

  * igt@kms_writeback@writeback-check-output:
    - shard-apl:          NOTRUN -> [SKIP][62] ([fdo#109271] / [i915#2437]) +1 similar issue
   [62]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl6/igt@kms_writeback@writeback-check-output.html

  * igt@kms_writeback@writeback-fb-id:
    - shard-kbl:          NOTRUN -> [SKIP][63] ([fdo#109271] / [i915#2437]) +1 similar issue
   [63]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl4/igt@kms_writeback@writeback-fb-id.html

  * igt@perf@polling-parameterized:
    - shard-skl:          [PASS][64] -> [FAIL][65] ([i915#1542])
   [64]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl10/igt@perf@polling-parameterized.html
   [65]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl10/igt@perf@polling-parameterized.html

  * igt@sysfs_clients@fair-7:
    - shard-apl:          NOTRUN -> [SKIP][66] ([fdo#109271] / [i915#2994]) +5 similar issues
   [66]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl8/igt@sysfs_clients@fair-7.html

  * igt@sysfs_clients@recycle-many:
    - shard-kbl:          NOTRUN -> [SKIP][67] ([fdo#109271] / [i915#2994])
   [67]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl6/igt@sysfs_clients@recycle-many.html

  
#### Possible fixes ####

  * igt@gem_create@create-clear:
    - shard-glk:          [FAIL][68] ([i915#1888] / [i915#3160]) -> [PASS][69]
   [68]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-glk5/igt@gem_create@create-clear.html
   [69]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-glk8/igt@gem_create@create-clear.html

  * igt@gem_eio@reset-stress:
    - shard-snb:          [TIMEOUT][70] ([i915#3427]) -> [PASS][71]
   [70]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-snb6/igt@gem_eio@reset-stress.html
   [71]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb2/igt@gem_eio@reset-stress.html

  * igt@gem_exec_fair@basic-deadline:
    - shard-kbl:          [FAIL][72] ([i915#2846]) -> [PASS][73]
   [72]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl7/igt@gem_exec_fair@basic-deadline.html
   [73]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl1/igt@gem_exec_fair@basic-deadline.html

  * igt@gem_exec_fair@basic-none-solo@rcs0:
    - shard-kbl:          [FAIL][74] ([i915#2842]) -> [PASS][75] +1 similar issue
   [74]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@gem_exec_fair@basic-none-solo@rcs0.html
   [75]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl4/igt@gem_exec_fair@basic-none-solo@rcs0.html

  * igt@gem_exec_fair@basic-pace@vcs0:
    - shard-iclb:         [FAIL][76] ([i915#2842]) -> [PASS][77]
   [76]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb8/igt@gem_exec_fair@basic-pace@vcs0.html
   [77]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb1/igt@gem_exec_fair@basic-pace@vcs0.html

  * igt@gem_exec_fair@basic-pace@vecs0:
    - shard-kbl:          [SKIP][78] ([fdo#109271]) -> [PASS][79] +1 similar issue
   [78]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl6/igt@gem_exec_fair@basic-pace@vecs0.html
   [79]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl6/igt@gem_exec_fair@basic-pace@vecs0.html
    - shard-glk:          [FAIL][80] ([i915#2842]) -> [PASS][81] +2 similar issues
   [80]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-glk5/igt@gem_exec_fair@basic-pace@vecs0.html
   [81]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-glk3/igt@gem_exec_fair@basic-pace@vecs0.html

  * igt@gem_exec_whisper@basic-normal-all:
    - shard-glk:          [DMESG-WARN][82] ([i915#118] / [i915#95]) -> [PASS][83]
   [82]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-glk6/igt@gem_exec_whisper@basic-normal-all.html
   [83]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-glk7/igt@gem_exec_whisper@basic-normal-all.html

  * igt@gem_mmap_gtt@cpuset-big-copy-odd:
    - shard-iclb:         [FAIL][84] ([i915#307]) -> [PASS][85]
   [84]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb8/igt@gem_mmap_gtt@cpuset-big-copy-odd.html
   [85]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb8/igt@gem_mmap_gtt@cpuset-big-copy-odd.html

  * igt@gem_mmap_gtt@cpuset-big-copy-xy:
    - shard-iclb:         [FAIL][86] ([i915#2428]) -> [PASS][87] +1 similar issue
   [86]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb2/igt@gem_mmap_gtt@cpuset-big-copy-xy.html
   [87]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb2/igt@gem_mmap_gtt@cpuset-big-copy-xy.html

  * igt@i915_pm_dc@dc6-psr:
    - shard-skl:          [FAIL][88] ([i915#454]) -> [PASS][89]
   [88]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl3/igt@i915_pm_dc@dc6-psr.html
   [89]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl1/igt@i915_pm_dc@dc6-psr.html

  * igt@i915_pm_sseu@full-enable:
    - shard-skl:          [FAIL][90] -> [PASS][91]
   [90]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl2/igt@i915_pm_sseu@full-enable.html
   [91]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl9/igt@i915_pm_sseu@full-enable.html

  * igt@i915_selftest@live@hangcheck:
    - shard-snb:          [INCOMPLETE][92] ([i915#2782]) -> [PASS][93]
   [92]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-snb2/igt@i915_selftest@live@hangcheck.html
   [93]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb5/igt@i915_selftest@live@hangcheck.html

  * igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions-varying-size:
    - shard-skl:          [FAIL][94] ([i915#2346] / [i915#533]) -> [PASS][95]
   [94]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl3/igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions-varying-size.html
   [95]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl1/igt@kms_cursor_legacy@flip-vs-cursor-atomic-transitions-varying-size.html

  * igt@kms_flip@flip-vs-suspend-interruptible@a-dp1:
    - shard-kbl:          [DMESG-WARN][96] ([i915#180]) -> [PASS][97] +11 similar issues
   [96]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@kms_flip@flip-vs-suspend-interruptible@a-dp1.html
   [97]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl7/igt@kms_flip@flip-vs-suspend-interruptible@a-dp1.html

  * igt@kms_flip@flip-vs-suspend@c-dp1:
    - shard-apl:          [DMESG-WARN][98] ([i915#180]) -> [PASS][99] +1 similar issue
   [98]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-apl2/igt@kms_flip@flip-vs-suspend@c-dp1.html
   [99]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl3/igt@kms_flip@flip-vs-suspend@c-dp1.html

  * igt@kms_flip@plain-flip-fb-recreate@b-edp1:
    - shard-skl:          [FAIL][100] ([i915#2122]) -> [PASS][101] +2 similar issues
   [100]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl9/igt@kms_flip@plain-flip-fb-recreate@b-edp1.html
   [101]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl4/igt@kms_flip@plain-flip-fb-recreate@b-edp1.html

  * igt@kms_frontbuffer_tracking@psr-1p-primscrn-indfb-msflip-blt:
    - shard-skl:          [DMESG-WARN][102] ([i915#1982]) -> [PASS][103]
   [102]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl2/igt@kms_frontbuffer_tracking@psr-1p-primscrn-indfb-msflip-blt.html
   [103]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl4/igt@kms_frontbuffer_tracking@psr-1p-primscrn-indfb-msflip-blt.html

  * igt@kms_hdr@bpc-switch-suspend:
    - shard-skl:          [FAIL][104] ([i915#1188]) -> [PASS][105]
   [104]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl2/igt@kms_hdr@bpc-switch-suspend.html
   [105]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl9/igt@kms_hdr@bpc-switch-suspend.html

  * igt@kms_plane_alpha_blend@pipe-a-coverage-7efc:
    - shard-skl:          [FAIL][106] ([fdo#108145] / [i915#265]) -> [PASS][107]
   [106]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl8/igt@kms_plane_alpha_blend@pipe-a-coverage-7efc.html
   [107]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl3/igt@kms_plane_alpha_blend@pipe-a-coverage-7efc.html

  * igt@kms_psr@psr2_cursor_render:
    - shard-iclb:         [SKIP][108] ([fdo#109441]) -> [PASS][109]
   [108]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb6/igt@kms_psr@psr2_cursor_render.html
   [109]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb2/igt@kms_psr@psr2_cursor_render.html

  * igt@kms_sequence@get-idle:
    - shard-snb:          [SKIP][110] ([fdo#109271]) -> [PASS][111]
   [110]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-snb7/igt@kms_sequence@get-idle.html
   [111]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-snb2/igt@kms_sequence@get-idle.html

  * igt@kms_vblank@pipe-a-ts-continuation-suspend:
    - shard-kbl:          [DMESG-WARN][112] ([i915#180] / [i915#295]) -> [PASS][113]
   [112]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@kms_vblank@pipe-a-ts-continuation-suspend.html
   [113]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl6/igt@kms_vblank@pipe-a-ts-continuation-suspend.html
    - shard-apl:          [DMESG-WARN][114] ([i915#180] / [i915#295]) -> [PASS][115]
   [114]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-apl2/igt@kms_vblank@pipe-a-ts-continuation-suspend.html
   [115]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl2/igt@kms_vblank@pipe-a-ts-continuation-suspend.html

  
#### Warnings ####

  * igt@i915_pm_rc6_residency@rc6-fence:
    - shard-iclb:         [WARN][116] ([i915#1804] / [i915#2684]) -> [WARN][117] ([i915#2684])
   [116]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb6/igt@i915_pm_rc6_residency@rc6-fence.html
   [117]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb2/igt@i915_pm_rc6_residency@rc6-fence.html

  * igt@i915_pm_rc6_residency@rc6-idle:
    - shard-iclb:         [WARN][118] ([i915#2684]) -> [WARN][119] ([i915#1804] / [i915#2684])
   [118]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb5/igt@i915_pm_rc6_residency@rc6-idle.html
   [119]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb4/igt@i915_pm_rc6_residency@rc6-idle.html

  * igt@kms_psr2_sf@primary-plane-update-sf-dmg-area-4:
    - shard-iclb:         [SKIP][120] ([i915#658]) -> [SKIP][121] ([i915#2920]) +1 similar issue
   [120]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb6/igt@kms_psr2_sf@primary-plane-update-sf-dmg-area-4.html
   [121]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb2/igt@kms_psr2_sf@primary-plane-update-sf-dmg-area-4.html

  * igt@kms_psr2_sf@primary-plane-update-sf-dmg-area-5:
    - shard-iclb:         [SKIP][122] ([i915#2920]) -> [SKIP][123] ([i915#658]) +1 similar issue
   [122]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-iclb2/igt@kms_psr2_sf@primary-plane-update-sf-dmg-area-5.html
   [123]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-iclb3/igt@kms_psr2_sf@primary-plane-update-sf-dmg-area-5.html

  * igt@runner@aborted:
    - shard-kbl:          ([FAIL][124], [FAIL][125], [FAIL][126], [FAIL][127], [FAIL][128], [FAIL][129], [FAIL][130], [FAIL][131]) ([i915#1436] / [i915#180] / [i915#1814] / [i915#2505] / [i915#3002] / [i915#3363] / [i915#602]) -> ([FAIL][132], [FAIL][133], [FAIL][134], [FAIL][135]) ([i915#1436] / [i915#180] / [i915#1814] / [i915#2505] / [i915#3002] / [i915#3363])
   [124]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@runner@aborted.html
   [125]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl7/igt@runner@aborted.html
   [126]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl6/igt@runner@aborted.html
   [127]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@runner@aborted.html
   [128]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@runner@aborted.html
   [129]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl6/igt@runner@aborted.html
   [130]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@runner@aborted.html
   [131]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-kbl2/igt@runner@aborted.html
   [132]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl2/igt@runner@aborted.html
   [133]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl2/igt@runner@aborted.html
   [134]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl4/igt@runner@aborted.html
   [135]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-kbl6/igt@runner@aborted.html
    - shard-apl:          ([FAIL][136], [FAIL][137], [FAIL][138], [FAIL][139]) ([i915#180] / [i915#1814] / [i915#3002] / [i915#3363]) -> [FAIL][140] ([fdo#109271] / [i915#1814] / [i915#3363])
   [136]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-apl2/igt@runner@aborted.html
   [137]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-apl2/igt@runner@aborted.html
   [138]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-apl3/igt@runner@aborted.html
   [139]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-apl2/igt@runner@aborted.html
   [140]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-apl1/igt@runner@aborted.html
    - shard-skl:          ([FAIL][141], [FAIL][142]) ([i915#1814] / [i915#2029] / [i915#3002] / [i915#3363]) -> ([FAIL][143], [FAIL][144]) ([i915#1436] / [i915#3002] / [i915#3363])
   [141]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl2/igt@runner@aborted.html
   [142]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10222/shard-skl3/igt@runner@aborted.html
   [143]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl6/igt@runner@aborted.html
   [144]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/shard-skl1/igt@runner@aborted.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [fdo#108145]: https://bugs.freedesktop.org/show_bug.cgi?id=108145
  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [fdo#109441]: https://bugs.freedesktop.org/show_bug.cgi?id=109441
  [fdo#111827]: https://bugs.freedesktop.org/show_bug.cgi?id=111827
  [i915#1099]: https://gitlab.freedesktop.org/drm/intel/issues/1099
  [i915#118]: https://gitlab.freedesktop.org/drm/intel/issues/118
  [i915#1188]: https://gitlab.freedesktop.org/drm/intel/issues/1188
  [i915#1319]: https://gitlab.freedesktop.org/drm/intel/issues/1319
  [i915#1436]: https://gitlab.freedesktop.org/drm/intel/issues/1436
  [i915#151]: https://gitlab.freedesktop.org/drm/intel/issues/151
  [i915#1542]: https://gitlab.freedesktop.org/drm/intel/issues/1542
  [i915#180]: https://gitlab.freedesktop.org/drm/intel/issues/180
  [i915#1804]: https://gitlab.freedesktop.org/drm/intel/issues/1804
  [i915#1814]: https://gitlab.freedesktop.org/drm/intel/issues/1814
  [i915#1888]: https://gitlab.freedesktop.org/drm/intel/issues/1888
  [i915#1982]: https://gitlab.freedesktop.org/drm/intel/issues/1982
  [i915#2029]: https://gitlab.freedesktop.org/drm/intel/issues/2029
  [i915#2105]: https://gitlab.freedesktop.org/drm/intel/issues/2105
  [i915#2122]: https://gitlab.freedesktop.org/drm/intel/issues/2122
  [i915#2346]: https://gitlab.freedesktop.org/drm/intel/issues/2346
  [i915#2389]: https://gitlab.freedesktop.org/drm/intel/issues/2389
  [i915#2428]: https://gitlab.freedesktop.org/drm/intel/issues/2428
  [i915#2437]: https://gitlab.freedesktop.org/drm/intel/issues/2437
  [i915#2505]: https://gitlab.freedesktop.org/drm/intel/issues/2505
  [i915#265]: https://gitlab.freedesktop.org/drm/intel/issues/265
  [i915#2658]: https://gitlab.freedesktop.org/drm/intel/issues/2658
  [i915#2684]: https://gitlab.freedesktop.org/drm/intel/issues/2684
  [i915#2733]: https://gitlab.freedesktop.org/drm/intel/issues/2733
  [i915#2782]: https://gitlab.freedesktop.org/drm/intel/issues/2782
  [i915#2842]: https://gitlab.freedesktop.org/drm/intel/issues/2842
  [i915#2846]: https://gitlab.freedesktop.org/drm/intel/issues/2846
  [i915#2849]: https://gitlab.freedesktop.org/drm/intel/issues/2849
  [i915#2920]: https://gitlab.freedesktop.org/drm/intel/issues/2920
  [i915#295]: https://gitlab.freedesktop.org/drm/intel/issues/295
  [i915#2994]: https://gitlab.freedesktop.org/drm/intel/issues/2994
  [i915#3002]: https://gitlab.freedesktop.org/drm/intel/issues/3002
  [i915#3063]: https://gitlab.freedesktop.org/drm/intel/issues/3063
  [i915#307]: https://gitl

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20361/index.html

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_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] Allow mdev drivers to directly create the vfio_device (v3)

[Christoph Hellwig]

This is my alternative take on this series from Jason:

https://lore.kernel.org/dri-devel/87czsszi9i.fsf@redhat.com/T/

The mdev/vfio parts are exactly the same, but this solves the driver core
changes for the direct probing without the in/out flag that Greg hated,
which cause a little more work, but probably make the result better.

Original decription from Jason below:

The mdev bus's core part for managing the lifecycle of devices is mostly
as one would expect for a driver core bus subsystem.

However instead of having a normal 'struct device_driver' and binding the
actual mdev drivers through the standard driver core mechanisms it open
codes this with the struct mdev_parent_ops and provides a single driver
that shims between the VFIO core's struct vfio_device and the actual
device driver.

Instead, allow mdev drivers implement an actual struct mdev_driver and
directly call vfio_register_group_dev() in the probe() function for the
mdev. Arrange to bind the created mdev_device to the mdev_driver that is
provided by the end driver.

The actual execution flow doesn't change much, eg what was
parent_ops->create is now device_driver->probe and it is called at almost
the exact same time - except under the normal control of the driver core.

Ultimately converting all the drivers unlocks a fair number of additional
VFIO simplifications and cleanups.

Changes since v1:
 - avoid warning spam for successful probes
 - improve the probe_count protection
_______________________________________________
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[Intel-gfx] [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Christoph Hellwig]

EPROBE_DEFER is an internal kernel error code and it should not be leaked
to userspace via the bind_store() sysfs. Userspace doesn't have this
constant and cannot understand it.

Further, it doesn't really make sense to have userspace trigger a deferred
probe via bind_store(), which could eventually succeed, while
simultaneously returning an error back.

Resolve this by splitting driver_probe_device so that the version used
by the sysfs binding that turns EPROBE_DEFER into -EAGAIN, while the one
used for internally binding keeps the error code, and calls
driver_deferred_probe_add where needed.  This also allows to nicely split
out the defer_all_probes / probe_count checks so that they actually allow
for full device_{block,unblock}_probing protection while not bothering
the sysfs bind case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/base/dd.c | 78 +++++++++++++++++++++++++----------------------
 1 file changed, 42 insertions(+), 36 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 25341f52198c..7d54bae52a8d 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -491,15 +491,6 @@ EXPORT_SYMBOL_GPL(device_bind_driver);
 static atomic_t probe_count = ATOMIC_INIT(0);
 static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue);
 
-static void driver_deferred_probe_add_trigger(struct device *dev,
-					      int local_trigger_count)
-{
-	driver_deferred_probe_add(dev);
-	/* Did a trigger occur while probing? Need to re-trigger if yes */
-	if (local_trigger_count != atomic_read(&deferred_trigger_count))
-		driver_deferred_probe_trigger();
-}
-
 static ssize_t state_synced_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
@@ -547,10 +538,9 @@ static int call_driver_probe(struct device *dev, struct device_driver *drv)
 
 static int really_probe(struct device *dev, struct device_driver *drv)
 {
-	int local_trigger_count = atomic_read(&deferred_trigger_count);
 	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
 			   !drv->suppress_bind_attrs;
-	int ret = -EPROBE_DEFER, probe_ret = 0;
+	int ret, probe_ret = 0;
 
 	if (defer_all_probes) {
 		/*
@@ -559,17 +549,13 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		 * wait_for_device_probe() right after that to avoid any races.
 		 */
 		dev_dbg(dev, "Driver %s force probe deferral\n", drv->name);
-		driver_deferred_probe_add(dev);
-		return ret;
+		return -EPROBE_DEFER;
 	}
 
 	ret = device_links_check_suppliers(dev);
-	if (ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 	if (ret)
 		return ret;
 
-	atomic_inc(&probe_count);
 	pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
 		 drv->bus->name, __func__, drv->name, dev_name(dev));
 	if (!list_empty(&dev->devres_head)) {
@@ -681,11 +667,7 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->dismiss(dev);
 	pm_runtime_reinit(dev);
 	dev_pm_set_driver_flags(dev, 0);
-	if (probe_ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 done:
-	atomic_dec(&probe_count);
-	wake_up_all(&probe_waitqueue);
 	return ret;
 }
 
@@ -739,21 +721,7 @@ void wait_for_device_probe(void)
 }
 EXPORT_SYMBOL_GPL(wait_for_device_probe);
 
-/**
- * driver_probe_device - attempt to bind device & driver together
- * @drv: driver to bind a device to
- * @dev: device to try to bind to the driver
- *
- * This function returns -ENODEV if the device is not registered, -EBUSY if it
- * already has a driver, 0 if the device is bound successfully and a positive
- * (inverted) error code for failures from the ->probe method.
- *
- * This function must be called with @dev lock held.  When called for a
- * USB interface, @dev->parent lock must be held as well.
- *
- * If the device has a parent, runtime-resume the parent before driver probing.
- */
-static int driver_probe_device(struct device_driver *drv, struct device *dev)
+static int __driver_probe_device(struct device_driver *drv, struct device *dev)
 {
 	int ret = 0;
 
@@ -784,6 +752,42 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
 	return ret;
 }
 
+/**
+ * driver_probe_device - attempt to bind device & driver together
+ * @drv: driver to bind a device to
+ * @dev: device to try to bind to the driver
+ *
+ * This function returns -ENODEV if the device is not registered, -EBUSY if it
+ * already has a driver, 0 if the device is bound successfully and a positive
+ * (inverted) error code for failures from the ->probe method.
+ *
+ * This function must be called with @dev lock held.  When called for a
+ * USB interface, @dev->parent lock must be held as well.
+ *
+ * If the device has a parent, runtime-resume the parent before driver probing.
+ */
+static int driver_probe_device(struct device_driver *drv, struct device *dev)
+{
+	int trigger_count = atomic_read(&deferred_trigger_count);
+	int ret;
+
+	atomic_inc(&probe_count);
+	ret = __driver_probe_device(drv, dev);
+	if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) {
+		driver_deferred_probe_add(dev);
+
+		/*
+		 * Did a trigger occur while probing? Need to re-trigger if yes
+		 */
+		if (trigger_count != atomic_read(&deferred_trigger_count) &&
+		    !defer_all_probes)
+			driver_deferred_probe_trigger();
+	}
+	atomic_dec(&probe_count);
+	wake_up_all(&probe_waitqueue);
+	return ret;
+}
+
 static inline bool cmdline_requested_async_probing(const char *drv_name)
 {
 	return parse_option_str(async_probe_drv_names, drv_name);
@@ -1051,12 +1055,14 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-	ret = driver_probe_device(drv, dev);
+	ret = __driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	/* also return probe errors as normal negative errnos */
 	if (ret > 0)
 		ret = -ret;
+	if (ret == -EPROBE_DEFER)
+		return -EAGAIN;
 	return ret;
 }
 
-- 
2.30.2

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Re: [Intel-gfx] [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Cornelia Huck]

On Tue, Jun 15 2021, Christoph Hellwig <hch@lst.de> wrote:

> EPROBE_DEFER is an internal kernel error code and it should not be leaked
> to userspace via the bind_store() sysfs. Userspace doesn't have this
> constant and cannot understand it.
>
> Further, it doesn't really make sense to have userspace trigger a deferred
> probe via bind_store(), which could eventually succeed, while
> simultaneously returning an error back.
>
> Resolve this by splitting driver_probe_device so that the version used
> by the sysfs binding that turns EPROBE_DEFER into -EAGAIN, while the one
> used for internally binding keeps the error code, and calls
> driver_deferred_probe_add where needed.  This also allows to nicely split
> out the defer_all_probes / probe_count checks so that they actually allow
> for full device_{block,unblock}_probing protection while not bothering
> the sysfs bind case.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/base/dd.c | 78 +++++++++++++++++++++++++----------------------
>  1 file changed, 42 insertions(+), 36 deletions(-)
>

Reviewed-by: Cornelia Huck <cohuck@redhat.com>

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Re: [Intel-gfx] [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Alex Williamson]

On Tue, 15 Jun 2021 15:35:13 +0200
Christoph Hellwig <hch@lst.de> wrote:

> @@ -547,10 +538,9 @@ static int call_driver_probe(struct device *dev, struct device_driver *drv)
>  
>  static int really_probe(struct device *dev, struct device_driver *drv)
>  {
> -	int local_trigger_count = atomic_read(&deferred_trigger_count);
>  	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
>  			   !drv->suppress_bind_attrs;
> -	int ret = -EPROBE_DEFER, probe_ret = 0;
> +	int ret, probe_ret = 0;

nit, probe_ret initialization could be removed with this patch too.

>  
>  	if (defer_all_probes) {
>  		/*
> @@ -559,17 +549,13 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>  		 * wait_for_device_probe() right after that to avoid any races.
>  		 */
>  		dev_dbg(dev, "Driver %s force probe deferral\n", drv->name);
> -		driver_deferred_probe_add(dev);
> -		return ret;
> +		return -EPROBE_DEFER;
>  	}
>  
>  	ret = device_links_check_suppliers(dev);
> -	if (ret == -EPROBE_DEFER)
> -		driver_deferred_probe_add_trigger(dev, local_trigger_count);
>  	if (ret)
>  		return ret;
>  
> -	atomic_inc(&probe_count);
>  	pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
>  		 drv->bus->name, __func__, drv->name, dev_name(dev));
>  	if (!list_empty(&dev->devres_head)) {
> @@ -681,11 +667,7 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>  		dev->pm_domain->dismiss(dev);
>  	pm_runtime_reinit(dev);
>  	dev_pm_set_driver_flags(dev, 0);
> -	if (probe_ret == -EPROBE_DEFER)
> -		driver_deferred_probe_add_trigger(dev, local_trigger_count);

This was the only possible uninitialized use case afaict.  Thanks,

Alex

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[Intel-gfx] Allow mdev drivers to directly create the vfio_device (v4)

[Christoph Hellwig]

This is my alternative take on this series from Jason:

https://lore.kernel.org/dri-devel/87czsszi9i.fsf@redhat.com/T/

The mdev/vfio parts are exactly the same, but this solves the driver core
changes for the direct probing without the in/out flag that Greg hated,
which cause a little more work, but probably make the result better.

Original decription from Jason below:

The mdev bus's core part for managing the lifecycle of devices is mostly
as one would expect for a driver core bus subsystem.

However instead of having a normal 'struct device_driver' and binding the
actual mdev drivers through the standard driver core mechanisms it open
codes this with the struct mdev_parent_ops and provides a single driver
that shims between the VFIO core's struct vfio_device and the actual
device driver.

Instead, allow mdev drivers implement an actual struct mdev_driver and
directly call vfio_register_group_dev() in the probe() function for the
mdev. Arrange to bind the created mdev_device to the mdev_driver that is
provided by the end driver.

The actual execution flow doesn't change much, eg what was
parent_ops->create is now device_driver->probe and it is called at almost
the exact same time - except under the normal control of the driver core.

Ultimately converting all the drivers unlocks a fair number of additional
VFIO simplifications and cleanups.

Changes since v3:
 - minor cleanup to avoid the probe_ret variable in really_probe entirely
 - use a saner name for a variable in mdev-mtty
 - use a better driver name in mdev-mtty
 - update the documentation to match the new interface

Changes since v2:
 - avoid warning spam for successful probes
 - improve the probe_count protection
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[Intel-gfx] [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during sysfs bind

[Christoph Hellwig]

EPROBE_DEFER is an internal kernel error code and it should not be leaked
to userspace via the bind_store() sysfs. Userspace doesn't have this
constant and cannot understand it.

Further, it doesn't really make sense to have userspace trigger a deferred
probe via bind_store(), which could eventually succeed, while
simultaneously returning an error back.

Resolve this by splitting driver_probe_device so that the version used
by the sysfs binding that turns EPROBE_DEFER into -EAGAIN, while the one
used for internally binding keeps the error code, and calls
driver_deferred_probe_add where needed.  This also allows to nicely split
out the defer_all_probes / probe_count checks so that they actually allow
for full device_{block,unblock}_probing protection while not bothering
the sysfs bind case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/base/dd.c | 84 +++++++++++++++++++++++++----------------------
 1 file changed, 45 insertions(+), 39 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 25341f52198c..1d8012459587 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -491,15 +491,6 @@ EXPORT_SYMBOL_GPL(device_bind_driver);
 static atomic_t probe_count = ATOMIC_INIT(0);
 static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue);
 
-static void driver_deferred_probe_add_trigger(struct device *dev,
-					      int local_trigger_count)
-{
-	driver_deferred_probe_add(dev);
-	/* Did a trigger occur while probing? Need to re-trigger if yes */
-	if (local_trigger_count != atomic_read(&deferred_trigger_count))
-		driver_deferred_probe_trigger();
-}
-
 static ssize_t state_synced_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
@@ -547,10 +538,9 @@ static int call_driver_probe(struct device *dev, struct device_driver *drv)
 
 static int really_probe(struct device *dev, struct device_driver *drv)
 {
-	int local_trigger_count = atomic_read(&deferred_trigger_count);
 	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
 			   !drv->suppress_bind_attrs;
-	int ret = -EPROBE_DEFER, probe_ret = 0;
+	int ret;
 
 	if (defer_all_probes) {
 		/*
@@ -559,17 +549,13 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		 * wait_for_device_probe() right after that to avoid any races.
 		 */
 		dev_dbg(dev, "Driver %s force probe deferral\n", drv->name);
-		driver_deferred_probe_add(dev);
-		return ret;
+		return -EPROBE_DEFER;
 	}
 
 	ret = device_links_check_suppliers(dev);
-	if (ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 	if (ret)
 		return ret;
 
-	atomic_inc(&probe_count);
 	pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
 		 drv->bus->name, __func__, drv->name, dev_name(dev));
 	if (!list_empty(&dev->devres_head)) {
@@ -604,13 +590,13 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 			goto probe_failed;
 	}
 
-	probe_ret = call_driver_probe(dev, drv);
-	if (probe_ret) {
+	ret = call_driver_probe(dev, drv);
+	if (ret) {
 		/*
 		 * Return probe errors as positive values so that the callers
 		 * can distinguish them from other errors.
 		 */
-		ret = -probe_ret;
+		ret = -ret;
 		goto probe_failed;
 	}
 
@@ -681,11 +667,7 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 		dev->pm_domain->dismiss(dev);
 	pm_runtime_reinit(dev);
 	dev_pm_set_driver_flags(dev, 0);
-	if (probe_ret == -EPROBE_DEFER)
-		driver_deferred_probe_add_trigger(dev, local_trigger_count);
 done:
-	atomic_dec(&probe_count);
-	wake_up_all(&probe_waitqueue);
 	return ret;
 }
 
@@ -739,21 +721,7 @@ void wait_for_device_probe(void)
 }
 EXPORT_SYMBOL_GPL(wait_for_device_probe);
 
-/**
- * driver_probe_device - attempt to bind device & driver together
- * @drv: driver to bind a device to
- * @dev: device to try to bind to the driver
- *
- * This function returns -ENODEV if the device is not registered, -EBUSY if it
- * already has a driver, 0 if the device is bound successfully and a positive
- * (inverted) error code for failures from the ->probe method.
- *
- * This function must be called with @dev lock held.  When called for a
- * USB interface, @dev->parent lock must be held as well.
- *
- * If the device has a parent, runtime-resume the parent before driver probing.
- */
-static int driver_probe_device(struct device_driver *drv, struct device *dev)
+static int __driver_probe_device(struct device_driver *drv, struct device *dev)
 {
 	int ret = 0;
 
@@ -784,6 +752,42 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
 	return ret;
 }
 
+/**
+ * driver_probe_device - attempt to bind device & driver together
+ * @drv: driver to bind a device to
+ * @dev: device to try to bind to the driver
+ *
+ * This function returns -ENODEV if the device is not registered, -EBUSY if it
+ * already has a driver, 0 if the device is bound successfully and a positive
+ * (inverted) error code for failures from the ->probe method.
+ *
+ * This function must be called with @dev lock held.  When called for a
+ * USB interface, @dev->parent lock must be held as well.
+ *
+ * If the device has a parent, runtime-resume the parent before driver probing.
+ */
+static int driver_probe_device(struct device_driver *drv, struct device *dev)
+{
+	int trigger_count = atomic_read(&deferred_trigger_count);
+	int ret;
+
+	atomic_inc(&probe_count);
+	ret = __driver_probe_device(drv, dev);
+	if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) {
+		driver_deferred_probe_add(dev);
+
+		/*
+		 * Did a trigger occur while probing? Need to re-trigger if yes
+		 */
+		if (trigger_count != atomic_read(&deferred_trigger_count) &&
+		    !defer_all_probes)
+			driver_deferred_probe_trigger();
+	}
+	atomic_dec(&probe_count);
+	wake_up_all(&probe_waitqueue);
+	return ret;
+}
+
 static inline bool cmdline_requested_async_probing(const char *drv_name)
 {
 	return parse_option_str(async_probe_drv_names, drv_name);
@@ -1051,12 +1055,14 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
 	int ret;
 
 	__device_driver_lock(dev, dev->parent);
-	ret = driver_probe_device(drv, dev);
+	ret = __driver_probe_device(drv, dev);
 	__device_driver_unlock(dev, dev->parent);
 
 	/* also return probe errors as normal negative errnos */
 	if (ret > 0)
 		ret = -ret;
+	if (ret == -EPROBE_DEFER)
+		return -EAGAIN;
 	return ret;
 }
 
-- 
2.30.2

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