[RFC 11/18] vfio/ccw: Use vfio_[attach/detach]_device

Yi Liu
2022-04-14T10:47:43Z

From: Eric Auger <eric.auger@redhat.com>

Let the vfio-ccw device use vfio_attach_device() and
vfio_detach_device(), hence hiding the details of the used
IOMMU backend.

Also now all the devices have been migrated to use the new
vfio_attach_device/vfio_detach_device API, let's turn the
legacy functions into static functions, local to container.c.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
hw/vfio/ccw.c | 118 ++++++++--------------------------
hw/vfio/container.c | 8 +--
include/hw/vfio/vfio-common.h | 4 --
3 files changed, 32 insertions(+), 98 deletions(-)

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 0354737666..6fde7849cc 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -579,27 +579,32 @@ static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
g_free(vcdev->io_region);
}

-static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
-{
- g_free(vcdev->vdev.name);
- vfio_put_base_device(&vcdev->vdev);
-}
-
-static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
- Error **errp)
+static void vfio_ccw_realize(DeviceState *dev, Error **errp)
{
+ CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
+ S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
+ VFIODevice *vbasedev = &vcdev->vdev;
+ Error *err = NULL;
char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
vcdev->cdev.hostid.ssid,
vcdev->cdev.hostid.devid);
- VFIODevice *vbasedev;
+ int ret;

- QLIST_FOREACH(vbasedev, &group->device_list, next) {
- if (strcmp(vbasedev->name, name) == 0) {
- error_setg(errp, "vfio: subchannel %s has already been attached",
- name);
- goto out_err;
+ /* Call the class init function for subchannel. */
+ if (cdc->realize) {
+ cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
+ if (err) {
+ goto out_err_propagate;
}
}
+ vbasedev->sysfsdev = g_strdup_printf("/sys/bus/css/devices/%s/%s",
+ name, cdev->mdevid);
+ vbasedev->ops = &vfio_ccw_ops;
+ vbasedev->type = VFIO_DEVICE_TYPE_CCW;
+ vbasedev->name = name;
+ vbasedev->dev = &vcdev->cdev.parent_obj.parent_obj;

/*
* All vfio-ccw devices are believed to operate in a way compatible with
@@ -609,80 +614,18 @@ static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
* needs to be set before vfio_get_device() for vfio common to handle
* ram_block_discard_disable().
*/
- vcdev->vdev.ram_block_discard_allowed = true;
-
- if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
- goto out_err;
- }
-
- vcdev->vdev.ops = &vfio_ccw_ops;
- vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
- vcdev->vdev.name = name;
- vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
-
- return;
-
-out_err:
- g_free(name);
-}
-
-static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
-{
- char *tmp, group_path[PATH_MAX];
- ssize_t len;
- int groupid;

- tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
- cdev->hostid.cssid, cdev->hostid.ssid,
- cdev->hostid.devid, cdev->mdevid);
- len = readlink(tmp, group_path, sizeof(group_path));
- g_free(tmp);
+ vbasedev->ram_block_discard_allowed = true;

- if (len <= 0 || len >= sizeof(group_path)) {
- error_setg(errp, "vfio: no iommu_group found");
- return NULL;
- }
-
- group_path[len] = 0;
-
- if (sscanf(basename(group_path), "%d", &groupid) != 1) {
- error_setg(errp, "vfio: failed to read %s", group_path);
- return NULL;
- }
-
- return vfio_get_group(groupid, &address_space_memory, errp);
-}
-
-static void vfio_ccw_realize(DeviceState *dev, Error **errp)
-{
- VFIOGroup *group;
- CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
- S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
- VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
- S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
- Error *err = NULL;
-
- /* Call the class init function for subchannel. */
- if (cdc->realize) {
- cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
- if (err) {
- goto out_err_propagate;
- }
- }
-
- group = vfio_ccw_get_group(cdev, &err);
- if (!group) {
- goto out_group_err;
- }
-
- vfio_ccw_get_device(group, vcdev, &err);
- if (err) {
- goto out_device_err;
+ ret = vfio_attach_device(vbasedev, &address_space_memory, errp);
+ if (ret) {
+ g_free(vbasedev->name);
+ g_free(vbasedev->sysfsdev);
}

vfio_ccw_get_region(vcdev, &err);
if (err) {
- goto out_region_err;
+ goto out_get_dev_err;
}

vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err);
@@ -714,11 +657,8 @@ out_irq_notifier_err:
vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
out_io_notifier_err:
vfio_ccw_put_region(vcdev);
-out_region_err:
- vfio_ccw_put_device(vcdev);
-out_device_err:
- vfio_put_group(group);
-out_group_err:
+out_get_dev_err:
+ vfio_detach_device(vbasedev);
if (cdc->unrealize) {
cdc->unrealize(cdev);
}
@@ -732,14 +672,12 @@ static void vfio_ccw_unrealize(DeviceState *dev)
S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
- VFIOGroup *group = vcdev->vdev.group;

vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
vfio_ccw_put_region(vcdev);
- vfio_ccw_put_device(vcdev);
- vfio_put_group(group);
+ vfio_detach_device(&vcdev->vdev);

if (cdc->unrealize) {
cdc->unrealize(cdev);
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index c74a3cd4ae..5d73f8285e 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -954,7 +954,7 @@ static void vfio_disconnect_container(VFIOGroup *group)
}
}

-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
+static VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
{
VFIOGroup *group;
VFIOContainer *bcontainer;
@@ -1023,7 +1023,7 @@ free_group_exit:
return NULL;
}

-void vfio_put_group(VFIOGroup *group)
+static void vfio_put_group(VFIOGroup *group)
{
if (!group || !QLIST_EMPTY(&group->device_list)) {
return;
@@ -1044,8 +1044,8 @@ void vfio_put_group(VFIOGroup *group)
}
}

-int vfio_get_device(VFIOGroup *group, const char *name,
- VFIODevice *vbasedev, Error **errp)
+static int vfio_get_device(VFIOGroup *group, const char *name,
+ VFIODevice *vbasedev, Error **errp)
{
struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
int ret, fd;
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 978b2c2f6e..7d7898717e 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -176,10 +176,6 @@ void vfio_region_unmap(VFIORegion *region);
void vfio_region_exit(VFIORegion *region);
void vfio_region_finalize(VFIORegion *region);
void vfio_reset_handler(void *opaque);
-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp);
-void vfio_put_group(VFIOGroup *group);
-int vfio_get_device(VFIOGroup *group, const char *name,
- VFIODevice *vbasedev, Error **errp);
int vfio_attach_device(VFIODevice *vbasedev, AddressSpace *as, Error **errp);
void vfio_detach_device(VFIODevice *vbasedev);

--
2.27.0