From: Yi Liu <yi.l.liu@intel.com>
To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com
Cc: mjrosato@linux.ibm.com, jasowang@redhat.com,
xudong.hao@intel.com, zhenzhong.duan@intel.com,
peterx@redhat.com, terrence.xu@intel.com,
chao.p.peng@linux.intel.com, linux-s390@vger.kernel.org,
yi.l.liu@intel.com, kvm@vger.kernel.org, lulu@redhat.com,
yanting.jiang@intel.com, joro@8bytes.org, nicolinc@nvidia.com,
yan.y.zhao@intel.com, intel-gfx@lists.freedesktop.org,
eric.auger@redhat.com, intel-gvt-dev@lists.freedesktop.org,
yi.y.sun@linux.intel.com, clegoate@redhat.com, cohuck@redhat.com,
shameerali.kolothum.thodi@huawei.com,
suravee.suthikulpanit@amd.com, robin.murphy@arm.com
Subject: [Intel-gfx] [PATCH v15 13/26] vfio-iommufd: Add detach_ioas support for physical VFIO devices
Date: Tue, 18 Jul 2023 06:55:38 -0700 [thread overview]
Message-ID: <20230718135551.6592-14-yi.l.liu@intel.com> (raw)
In-Reply-To: <20230718135551.6592-1-yi.l.liu@intel.com>
This prepares for adding DETACH ioctl for physical VFIO devices.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Tested-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
Documentation/driver-api/vfio.rst | 8 +++++---
drivers/vfio/fsl-mc/vfio_fsl_mc.c | 1 +
drivers/vfio/iommufd.c | 20 +++++++++++++++++++
.../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 2 ++
drivers/vfio/pci/mlx5/main.c | 1 +
drivers/vfio/pci/vfio_pci.c | 1 +
drivers/vfio/platform/vfio_amba.c | 1 +
drivers/vfio/platform/vfio_platform.c | 1 +
drivers/vfio/vfio_main.c | 3 ++-
include/linux/vfio.h | 8 +++++++-
10 files changed, 41 insertions(+), 5 deletions(-)
diff --git a/Documentation/driver-api/vfio.rst b/Documentation/driver-api/vfio.rst
index 68abc089d6dd..363e12c90b87 100644
--- a/Documentation/driver-api/vfio.rst
+++ b/Documentation/driver-api/vfio.rst
@@ -279,6 +279,7 @@ similar to a file operations structure::
struct iommufd_ctx *ictx, u32 *out_device_id);
void (*unbind_iommufd)(struct vfio_device *vdev);
int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id);
+ void (*detach_ioas)(struct vfio_device *vdev);
int (*open_device)(struct vfio_device *vdev);
void (*close_device)(struct vfio_device *vdev);
ssize_t (*read)(struct vfio_device *vdev, char __user *buf,
@@ -315,9 +316,10 @@ container_of().
- The [un]bind_iommufd callbacks are issued when the device is bound to
and unbound from iommufd.
- - The attach_ioas callback is issued when the device is attached to an
- IOAS managed by the bound iommufd. The attached IOAS is automatically
- detached when the device is unbound from iommufd.
+ - The [de]attach_ioas callback is issued when the device is attached to
+ and detached from an IOAS managed by the bound iommufd. However, the
+ attached IOAS can also be automatically detached when the device is
+ unbound from iommufd.
- The read/write/mmap callbacks implement the device region access defined
by the device's own VFIO_DEVICE_GET_REGION_INFO ioctl.
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index f2140e94d41e..116358a8f1cf 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -593,6 +593,7 @@ static const struct vfio_device_ops vfio_fsl_mc_ops = {
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static struct fsl_mc_driver vfio_fsl_mc_driver = {
diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c
index 4fc674c01a05..86df5415759a 100644
--- a/drivers/vfio/iommufd.c
+++ b/drivers/vfio/iommufd.c
@@ -140,6 +140,14 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
{
int rc;
+ lockdep_assert_held(&vdev->dev_set->lock);
+
+ if (WARN_ON(!vdev->iommufd_device))
+ return -EINVAL;
+
+ if (vdev->iommufd_attached)
+ return -EBUSY;
+
rc = iommufd_device_attach(vdev->iommufd_device, pt_id);
if (rc)
return rc;
@@ -148,6 +156,18 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
}
EXPORT_SYMBOL_GPL(vfio_iommufd_physical_attach_ioas);
+void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev)
+{
+ lockdep_assert_held(&vdev->dev_set->lock);
+
+ if (WARN_ON(!vdev->iommufd_device) || !vdev->iommufd_attached)
+ return;
+
+ iommufd_device_detach(vdev->iommufd_device);
+ vdev->iommufd_attached = false;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_physical_detach_ioas);
+
/*
* The emulated standard ops mean that vfio_device is going to use the
* "mdev path" and will call vfio_pin_pages()/vfio_dma_rw(). Drivers using this
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index a117eaf21c14..b2f9778c8366 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -1373,6 +1373,7 @@ static const struct vfio_device_ops hisi_acc_vfio_pci_migrn_ops = {
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static const struct vfio_device_ops hisi_acc_vfio_pci_ops = {
@@ -1391,6 +1392,7 @@ static const struct vfio_device_ops hisi_acc_vfio_pci_ops = {
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c
index d95fd382814c..42ec574a8622 100644
--- a/drivers/vfio/pci/mlx5/main.c
+++ b/drivers/vfio/pci/mlx5/main.c
@@ -1320,6 +1320,7 @@ static const struct vfio_device_ops mlx5vf_pci_ops = {
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static int mlx5vf_pci_probe(struct pci_dev *pdev,
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 29091ee2e984..cb5b7f865d58 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -141,6 +141,7 @@ static const struct vfio_device_ops vfio_pci_ops = {
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
index 83fe54015595..6464b3939ebc 100644
--- a/drivers/vfio/platform/vfio_amba.c
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -119,6 +119,7 @@ static const struct vfio_device_ops vfio_amba_ops = {
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static const struct amba_id pl330_ids[] = {
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 22a1efca32a8..8cf22fa65baa 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -108,6 +108,7 @@ static const struct vfio_device_ops vfio_platform_ops = {
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static struct platform_driver vfio_platform_driver = {
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 3a4b7eb128df..c71c0d1a079f 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -273,7 +273,8 @@ static int __vfio_register_dev(struct vfio_device *device,
if (WARN_ON(IS_ENABLED(CONFIG_IOMMUFD) &&
(!device->ops->bind_iommufd ||
!device->ops->unbind_iommufd ||
- !device->ops->attach_ioas)))
+ !device->ops->attach_ioas ||
+ !device->ops->detach_ioas)))
return -EINVAL;
/*
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 06a5221949c5..f2f02273ece1 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -73,7 +73,9 @@ struct vfio_device {
* @bind_iommufd: Called when binding the device to an iommufd
* @unbind_iommufd: Opposite of bind_iommufd
* @attach_ioas: Called when attaching device to an IOAS/HWPT managed by the
- * bound iommufd. Undo in unbind_iommufd.
+ * bound iommufd. Undo in unbind_iommufd if @detach_ioas is not
+ * called.
+ * @detach_ioas: Opposite of attach_ioas
* @open_device: Called when the first file descriptor is opened for this device
* @close_device: Opposite of open_device
* @read: Perform read(2) on device file descriptor
@@ -97,6 +99,7 @@ struct vfio_device_ops {
struct iommufd_ctx *ictx, u32 *out_device_id);
void (*unbind_iommufd)(struct vfio_device *vdev);
int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id);
+ void (*detach_ioas)(struct vfio_device *vdev);
int (*open_device)(struct vfio_device *vdev);
void (*close_device)(struct vfio_device *vdev);
ssize_t (*read)(struct vfio_device *vdev, char __user *buf,
@@ -120,6 +123,7 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev,
struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_physical_unbind(struct vfio_device *vdev);
int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
+void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev);
int vfio_iommufd_emulated_bind(struct vfio_device *vdev,
struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_emulated_unbind(struct vfio_device *vdev);
@@ -144,6 +148,8 @@ vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_physical_attach_ioas \
((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
+#define vfio_iommufd_physical_detach_ioas \
+ ((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_emulated_bind \
((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx, \
u32 *out_device_id)) NULL)
--
2.34.1
next prev parent reply other threads:[~2023-07-18 13:56 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-18 13:55 [Intel-gfx] [PATCH v15 00/26] Add vfio_device cdev for iommufd support Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 01/26] vfio: Allocate per device file structure Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 02/26] vfio: Refine vfio file kAPIs for KVM Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 03/26] vfio: Accept vfio device file in the KVM facing kAPI Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 04/26] kvm/vfio: Prepare for accepting vfio device fd Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 05/26] kvm/vfio: Accept vfio device file from userspace Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 06/26] vfio: Pass struct vfio_device_file * to vfio_device_open/close() Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 07/26] vfio: Block device access via device fd until device is opened Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 08/26] vfio: Add cdev_device_open_cnt to vfio_group Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 09/26] vfio: Make vfio_df_open() single open for device cdev path Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 10/26] vfio-iommufd: Move noiommu compat validation out of vfio_iommufd_bind() Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 11/26] vfio-iommufd: Split bind/attach into two steps Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 12/26] vfio: Record devid in vfio_device_file Yi Liu
2023-07-18 13:55 ` Yi Liu [this message]
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 14/26] iommufd/device: Add iommufd_access_detach() API Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 15/26] vfio-iommufd: Add detach_ioas support for emulated VFIO devices Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 16/26] vfio: Move vfio_device_group_unregister() to be the first operation in unregister Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 17/26] vfio: Move device_del() before waiting for the last vfio_device registration refcount Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 18/26] vfio: Add cdev for vfio_device Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 19/26] vfio: Test kvm pointer in _vfio_device_get_kvm_safe() Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 20/26] iommufd: Add iommufd_ctx_from_fd() Yi Liu
2023-07-18 16:55 ` Jason Gunthorpe
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 21/26] vfio: Avoid repeated user pointer cast in vfio_device_fops_unl_ioctl() Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 22/26] vfio: Add VFIO_DEVICE_BIND_IOMMUFD Yi Liu
2023-07-18 16:56 ` Jason Gunthorpe
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 23/26] vfio: Add VFIO_DEVICE_[AT|DE]TACH_IOMMUFD_PT Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 24/26] vfio: Move the IOMMU_CAP_CACHE_COHERENCY check in __vfio_register_dev() Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 25/26] vfio: Compile vfio_group infrastructure optionally Yi Liu
2023-07-18 13:55 ` [Intel-gfx] [PATCH v15 26/26] docs: vfio: Add vfio device cdev description Yi Liu
2023-07-18 15:55 ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for Add vfio_device cdev for iommufd support (rev19) Patchwork
2023-07-18 16:57 ` [Intel-gfx] [PATCH v15 00/26] Add vfio_device cdev for iommufd support Jason Gunthorpe
2023-07-24 19:09 ` Alex Williamson
2023-07-25 18:00 ` Alex Williamson
2023-07-26 13:39 ` Jason Gunthorpe
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