| Message ID | 20200311112004.47138-5-stevensd@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Support virtio cross-device resources | expand |
On Wed, Mar 11, 2020 at 08:20:04PM +0900, David Stevens wrote: > Add support for UUID-based resource sharing mechanism to virtgpu. This > implements the new virtgpu commands and hooks them up to dma-buf's > get_uuid callback. > > Signed-off-by: David Stevens <stevensd@chromium.org> > --- > drivers/gpu/drm/virtio/virtgpu_drv.c | 3 ++ > drivers/gpu/drm/virtio/virtgpu_drv.h | 18 +++++++++ > drivers/gpu/drm/virtio/virtgpu_kms.c | 4 ++ > drivers/gpu/drm/virtio/virtgpu_prime.c | 41 +++++++++++++++++-- > drivers/gpu/drm/virtio/virtgpu_vq.c | 55 ++++++++++++++++++++++++++ > 5 files changed, 118 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c > index ab4bed78e656..776e6667042e 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_drv.c > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c > @@ -165,6 +165,7 @@ static unsigned int features[] = { > VIRTIO_GPU_F_VIRGL, > #endif > VIRTIO_GPU_F_EDID, > + VIRTIO_GPU_F_RESOURCE_UUID, > }; > static struct virtio_driver virtio_gpu_driver = { > .feature_table = features, > @@ -202,7 +203,9 @@ static struct drm_driver driver = { > .prime_handle_to_fd = drm_gem_prime_handle_to_fd, > .prime_fd_to_handle = drm_gem_prime_fd_to_handle, > .gem_prime_mmap = drm_gem_prime_mmap, > + .gem_prime_export = virtgpu_gem_prime_export, > .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, > + .gem_prime_get_uuid = virtgpu_gem_prime_get_uuid, > > .gem_create_object = virtio_gpu_create_object, > .fops = &virtio_gpu_driver_fops, > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h > index af9403e1cf78..fab65f0f5a4d 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_drv.h > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h > @@ -49,6 +49,10 @@ > #define DRIVER_MINOR 1 > #define DRIVER_PATCHLEVEL 0 > > +#define UUID_INITIALIZING 0 > +#define UUID_INITIALIZED 1 > +#define UUID_INITIALIZATION_FAILED 2 > + > struct virtio_gpu_object_params { > uint32_t format; > uint32_t width; > @@ -75,6 +79,9 @@ struct virtio_gpu_object { > > bool dumb; > bool created; > + > + int uuid_state; > + uuid_t uuid; > }; > #define gem_to_virtio_gpu_obj(gobj) \ > container_of((gobj), struct virtio_gpu_object, base.base) > @@ -196,6 +203,7 @@ struct virtio_gpu_device { > bool has_virgl_3d; > bool has_edid; > bool has_indirect; > + bool has_resource_assign_uuid; > > struct work_struct config_changed_work; > > @@ -206,6 +214,8 @@ struct virtio_gpu_device { > struct virtio_gpu_drv_capset *capsets; > uint32_t num_capsets; > struct list_head cap_cache; > + > + spinlock_t resource_export_lock; > }; > > struct virtio_gpu_fpriv { > @@ -338,6 +348,10 @@ void virtio_gpu_dequeue_fence_func(struct work_struct *work); > void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev); > void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev); > > +int > +virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev, > + struct virtio_gpu_object_array *objs); > + > /* virtio_gpu_display.c */ > void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev); > void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev); > @@ -366,6 +380,10 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev, > struct virtio_gpu_object **bo_ptr, > struct virtio_gpu_fence *fence); > /* virtgpu_prime.c */ > +struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, > + int flags); > +int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj, > + uuid_t *uuid); > struct drm_gem_object *virtgpu_gem_prime_import_sg_table( > struct drm_device *dev, struct dma_buf_attachment *attach, > struct sg_table *sgt); > diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c > index 4009c2f97d08..5a2aeb6d2f35 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_kms.c > +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c > @@ -134,6 +134,7 @@ int virtio_gpu_init(struct drm_device *dev) > vgdev->dev = dev->dev; > > spin_lock_init(&vgdev->display_info_lock); > + spin_lock_init(&vgdev->resource_export_lock); > ida_init(&vgdev->ctx_id_ida); > ida_init(&vgdev->resource_ida); > init_waitqueue_head(&vgdev->resp_wq); > @@ -162,6 +163,9 @@ int virtio_gpu_init(struct drm_device *dev) > if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) { > vgdev->has_indirect = true; > } > + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) { > + vgdev->has_resource_assign_uuid = true; > + } Just a question: this relies on DMA bufs so I assume it is not really assumed to work when DMA API is bypassed, right? Rather than worry what does it mean, how about just disabling this feature without PLATFORM_DMA for now? > > DRM_INFO("features: %cvirgl %cedid\n", > vgdev->has_virgl_3d ? '+' : '-', > diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c > index 050d24c39a8f..7c6357f59877 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_prime.c > +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c > @@ -26,9 +26,44 @@ > > #include "virtgpu_drv.h" > > -/* Empty Implementations as there should not be any other driver for a virtual > - * device that might share buffers with virtgpu > - */ > +int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj, > + uuid_t *uuid) > +{ > + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); > + struct virtio_gpu_device *vgdev = obj->dev->dev_private; > + > + wait_event(vgdev->resp_wq, bo->uuid_state != UUID_INITIALIZING); > + if (bo->uuid_state != UUID_INITIALIZED) > + return -ENODEV; > + > + uuid_copy(uuid, &bo->uuid); > + > + return 0; > +} > + > +struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, > + int flags) > +{ > + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); > + struct virtio_gpu_device *vgdev = obj->dev->dev_private; > + struct virtio_gpu_object_array *objs; > + int ret = 0; > + > + if (vgdev->has_resource_assign_uuid) { > + objs = virtio_gpu_array_alloc(1); > + if (!objs) > + return ERR_PTR(-ENOMEM); > + virtio_gpu_array_add_obj(objs, &bo->base.base); > + > + ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs); > + if (ret) > + return ERR_PTR(ret); > + } else { > + bo->uuid_state = UUID_INITIALIZATION_FAILED; > + } > + > + return drm_gem_prime_export(obj, flags); > +} > > struct drm_gem_object *virtgpu_gem_prime_import_sg_table( > struct drm_device *dev, struct dma_buf_attachment *attach, > diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c > index cfe9c54f87a3..b968eaa46bb0 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_vq.c > +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c > @@ -1111,3 +1111,58 @@ void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev, > memcpy(cur_p, &output->cursor, sizeof(output->cursor)); > virtio_gpu_queue_cursor(vgdev, vbuf); > } > + > +static void virtio_gpu_cmd_resource_uuid_cb(struct virtio_gpu_device *vgdev, > + struct virtio_gpu_vbuffer *vbuf) > +{ > + struct virtio_gpu_object *obj = > + gem_to_virtio_gpu_obj(vbuf->objs->objs[0]); > + struct virtio_gpu_resp_resource_uuid *resp = > + (struct virtio_gpu_resp_resource_uuid *)vbuf->resp_buf; > + uint32_t resp_type = le32_to_cpu(resp->hdr.type); > + > + spin_lock(&vgdev->resource_export_lock); > + WARN_ON(obj->uuid_state != UUID_INITIALIZING); > + > + if (resp_type == VIRTIO_GPU_RESP_OK_RESOURCE_UUID && > + obj->uuid_state == UUID_INITIALIZING) { > + memcpy(&obj->uuid.b, resp->uuid, sizeof(obj->uuid.b)); > + obj->uuid_state = UUID_INITIALIZED; > + } else { > + obj->uuid_state = UUID_INITIALIZATION_FAILED; > + } > + spin_unlock(&vgdev->resource_export_lock); > + > + wake_up_all(&vgdev->resp_wq); > +} > + > +int > +virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev, > + struct virtio_gpu_object_array *objs) > +{ > + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]); > + struct virtio_gpu_resource_assign_uuid *cmd_p; > + struct virtio_gpu_vbuffer *vbuf; > + struct virtio_gpu_resp_resource_uuid *resp_buf; > + > + resp_buf = kzalloc(sizeof(*resp_buf), GFP_KERNEL); > + if (!resp_buf) { > + spin_lock(&vgdev->resource_export_lock); > + bo->uuid_state = UUID_INITIALIZATION_FAILED; > + spin_unlock(&vgdev->resource_export_lock); > + virtio_gpu_array_put_free(objs); > + return -ENOMEM; > + } > + > + cmd_p = virtio_gpu_alloc_cmd_resp(vgdev, > + virtio_gpu_cmd_resource_uuid_cb, &vbuf, sizeof(*cmd_p), > + sizeof(struct virtio_gpu_resp_resource_uuid), resp_buf); > + memset(cmd_p, 0, sizeof(*cmd_p)); > + > + cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID); > + cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle); > + > + vbuf->objs = objs; > + virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); > + return 0; > +} > -- > 2.25.1.481.gfbce0eb801-goog
> > + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) { > > + vgdev->has_resource_assign_uuid = true; > > + } > > > Just a question: this relies on DMA bufs so I assume it is > not really assumed to work when DMA API is bypassed, right? > Rather than worry what does it mean, how about just > disabling this feature without PLATFORM_DMA for now? By PLATFORM_DMA, do you mean CONFIG_DMA_SHARED_BUFFER? Virtio-gpu depends on DRM, which selects that feature. So I think DMA bufs should always be available when virtio-gpu is present. -David
On Fri, May 15, 2020 at 04:26:15PM +0900, David Stevens wrote: > > > + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) { > > > + vgdev->has_resource_assign_uuid = true; > > > + } > > > > > > Just a question: this relies on DMA bufs so I assume it is > > not really assumed to work when DMA API is bypassed, right? > > Rather than worry what does it mean, how about just > > disabling this feature without PLATFORM_DMA for now? > > By PLATFORM_DMA, do you mean CONFIG_DMA_SHARED_BUFFER? Sorry, no. I mean VIRTIO_F_IOMMU_PLATFORM which in the future will be renamed to VIRTIO_F_PLATFORM_ACCESS. > Virtio-gpu > depends on DRM, which selects that feature. So I think DMA bufs should > always be available when virtio-gpu is present. > > -David
On Mon, Jun 8, 2020 at 6:43 PM Michael S. Tsirkin <mst@redhat.com> wrote: > > On Fri, May 15, 2020 at 04:26:15PM +0900, David Stevens wrote: > > > > + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) { > > > > + vgdev->has_resource_assign_uuid = true; > > > > + } > > > > > > > > > Just a question: this relies on DMA bufs so I assume it is > > > not really assumed to work when DMA API is bypassed, right? > > > Rather than worry what does it mean, how about just > > > disabling this feature without PLATFORM_DMA for now? > > > > By PLATFORM_DMA, do you mean CONFIG_DMA_SHARED_BUFFER? > > Sorry, no. I mean VIRTIO_F_IOMMU_PLATFORM which in the > future will be renamed to VIRTIO_F_PLATFORM_ACCESS. Shouldn't things work independent of whether or not that feature is set? If a virtio driver properly uses the dma_buf APIs (which virtgpu seems to), then that should take care of any mapping/synchronization related to VIRTIO_F_IOMMU_PLATFORM. If anything, the case where VIRTIO_F_IOMMU_PLATFORM isn't set is easier, since then we know that the "the device has same access [sic] to memory addresses supplied to it as the driver has", according to the specification. -David
On Mon, Jun 08, 2020 at 07:36:55PM +0900, David Stevens wrote: > On Mon, Jun 8, 2020 at 6:43 PM Michael S. Tsirkin <mst@redhat.com> wrote: > > > > On Fri, May 15, 2020 at 04:26:15PM +0900, David Stevens wrote: > > > > > + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) { > > > > > + vgdev->has_resource_assign_uuid = true; > > > > > + } > > > > > > > > > > > > Just a question: this relies on DMA bufs so I assume it is > > > > not really assumed to work when DMA API is bypassed, right? > > > > Rather than worry what does it mean, how about just > > > > disabling this feature without PLATFORM_DMA for now? > > > > > > By PLATFORM_DMA, do you mean CONFIG_DMA_SHARED_BUFFER? > > > > Sorry, no. I mean VIRTIO_F_IOMMU_PLATFORM which in the > > future will be renamed to VIRTIO_F_PLATFORM_ACCESS. > > Shouldn't things work independent of whether or not that feature is > set? If a virtio driver properly uses the dma_buf APIs (which virtgpu > seems to), then that should take care of any mapping/synchronization > related to VIRTIO_F_IOMMU_PLATFORM. If anything, the case where > VIRTIO_F_IOMMU_PLATFORM isn't set is easier, since then we know that > the "the device has same access [sic] to memory addresses supplied to > it as the driver has", according to the specification. > > -David I don't know much about drm so I can't tell, I was hoping Gerd can explain.
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c index ab4bed78e656..776e6667042e 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.c +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c @@ -165,6 +165,7 @@ static unsigned int features[] = { VIRTIO_GPU_F_VIRGL, #endif VIRTIO_GPU_F_EDID, + VIRTIO_GPU_F_RESOURCE_UUID, }; static struct virtio_driver virtio_gpu_driver = { .feature_table = features, @@ -202,7 +203,9 @@ static struct drm_driver driver = { .prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle, .gem_prime_mmap = drm_gem_prime_mmap, + .gem_prime_export = virtgpu_gem_prime_export, .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table, + .gem_prime_get_uuid = virtgpu_gem_prime_get_uuid, .gem_create_object = virtio_gpu_create_object, .fops = &virtio_gpu_driver_fops, diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h index af9403e1cf78..fab65f0f5a4d 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.h +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h @@ -49,6 +49,10 @@ #define DRIVER_MINOR 1 #define DRIVER_PATCHLEVEL 0 +#define UUID_INITIALIZING 0 +#define UUID_INITIALIZED 1 +#define UUID_INITIALIZATION_FAILED 2 + struct virtio_gpu_object_params { uint32_t format; uint32_t width; @@ -75,6 +79,9 @@ struct virtio_gpu_object { bool dumb; bool created; + + int uuid_state; + uuid_t uuid; }; #define gem_to_virtio_gpu_obj(gobj) \ container_of((gobj), struct virtio_gpu_object, base.base) @@ -196,6 +203,7 @@ struct virtio_gpu_device { bool has_virgl_3d; bool has_edid; bool has_indirect; + bool has_resource_assign_uuid; struct work_struct config_changed_work; @@ -206,6 +214,8 @@ struct virtio_gpu_device { struct virtio_gpu_drv_capset *capsets; uint32_t num_capsets; struct list_head cap_cache; + + spinlock_t resource_export_lock; }; struct virtio_gpu_fpriv { @@ -338,6 +348,10 @@ void virtio_gpu_dequeue_fence_func(struct work_struct *work); void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev); void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev); +int +virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev, + struct virtio_gpu_object_array *objs); + /* virtio_gpu_display.c */ void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev); void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev); @@ -366,6 +380,10 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev, struct virtio_gpu_object **bo_ptr, struct virtio_gpu_fence *fence); /* virtgpu_prime.c */ +struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, + int flags); +int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj, + uuid_t *uuid); struct drm_gem_object *virtgpu_gem_prime_import_sg_table( struct drm_device *dev, struct dma_buf_attachment *attach, struct sg_table *sgt); diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c index 4009c2f97d08..5a2aeb6d2f35 100644 --- a/drivers/gpu/drm/virtio/virtgpu_kms.c +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c @@ -134,6 +134,7 @@ int virtio_gpu_init(struct drm_device *dev) vgdev->dev = dev->dev; spin_lock_init(&vgdev->display_info_lock); + spin_lock_init(&vgdev->resource_export_lock); ida_init(&vgdev->ctx_id_ida); ida_init(&vgdev->resource_ida); init_waitqueue_head(&vgdev->resp_wq); @@ -162,6 +163,9 @@ int virtio_gpu_init(struct drm_device *dev) if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) { vgdev->has_indirect = true; } + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) { + vgdev->has_resource_assign_uuid = true; + } DRM_INFO("features: %cvirgl %cedid\n", vgdev->has_virgl_3d ? '+' : '-', diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c index 050d24c39a8f..7c6357f59877 100644 --- a/drivers/gpu/drm/virtio/virtgpu_prime.c +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c @@ -26,9 +26,44 @@ #include "virtgpu_drv.h" -/* Empty Implementations as there should not be any other driver for a virtual - * device that might share buffers with virtgpu - */ +int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj, + uuid_t *uuid) +{ + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); + struct virtio_gpu_device *vgdev = obj->dev->dev_private; + + wait_event(vgdev->resp_wq, bo->uuid_state != UUID_INITIALIZING); + if (bo->uuid_state != UUID_INITIALIZED) + return -ENODEV; + + uuid_copy(uuid, &bo->uuid); + + return 0; +} + +struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, + int flags) +{ + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); + struct virtio_gpu_device *vgdev = obj->dev->dev_private; + struct virtio_gpu_object_array *objs; + int ret = 0; + + if (vgdev->has_resource_assign_uuid) { + objs = virtio_gpu_array_alloc(1); + if (!objs) + return ERR_PTR(-ENOMEM); + virtio_gpu_array_add_obj(objs, &bo->base.base); + + ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs); + if (ret) + return ERR_PTR(ret); + } else { + bo->uuid_state = UUID_INITIALIZATION_FAILED; + } + + return drm_gem_prime_export(obj, flags); +} struct drm_gem_object *virtgpu_gem_prime_import_sg_table( struct drm_device *dev, struct dma_buf_attachment *attach, diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c index cfe9c54f87a3..b968eaa46bb0 100644 --- a/drivers/gpu/drm/virtio/virtgpu_vq.c +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c @@ -1111,3 +1111,58 @@ void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev, memcpy(cur_p, &output->cursor, sizeof(output->cursor)); virtio_gpu_queue_cursor(vgdev, vbuf); } + +static void virtio_gpu_cmd_resource_uuid_cb(struct virtio_gpu_device *vgdev, + struct virtio_gpu_vbuffer *vbuf) +{ + struct virtio_gpu_object *obj = + gem_to_virtio_gpu_obj(vbuf->objs->objs[0]); + struct virtio_gpu_resp_resource_uuid *resp = + (struct virtio_gpu_resp_resource_uuid *)vbuf->resp_buf; + uint32_t resp_type = le32_to_cpu(resp->hdr.type); + + spin_lock(&vgdev->resource_export_lock); + WARN_ON(obj->uuid_state != UUID_INITIALIZING); + + if (resp_type == VIRTIO_GPU_RESP_OK_RESOURCE_UUID && + obj->uuid_state == UUID_INITIALIZING) { + memcpy(&obj->uuid.b, resp->uuid, sizeof(obj->uuid.b)); + obj->uuid_state = UUID_INITIALIZED; + } else { + obj->uuid_state = UUID_INITIALIZATION_FAILED; + } + spin_unlock(&vgdev->resource_export_lock); + + wake_up_all(&vgdev->resp_wq); +} + +int +virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev, + struct virtio_gpu_object_array *objs) +{ + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]); + struct virtio_gpu_resource_assign_uuid *cmd_p; + struct virtio_gpu_vbuffer *vbuf; + struct virtio_gpu_resp_resource_uuid *resp_buf; + + resp_buf = kzalloc(sizeof(*resp_buf), GFP_KERNEL); + if (!resp_buf) { + spin_lock(&vgdev->resource_export_lock); + bo->uuid_state = UUID_INITIALIZATION_FAILED; + spin_unlock(&vgdev->resource_export_lock); + virtio_gpu_array_put_free(objs); + return -ENOMEM; + } + + cmd_p = virtio_gpu_alloc_cmd_resp(vgdev, + virtio_gpu_cmd_resource_uuid_cb, &vbuf, sizeof(*cmd_p), + sizeof(struct virtio_gpu_resp_resource_uuid), resp_buf); + memset(cmd_p, 0, sizeof(*cmd_p)); + + cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID); + cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle); + + vbuf->objs = objs; + virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + return 0; +}
Add support for UUID-based resource sharing mechanism to virtgpu. This implements the new virtgpu commands and hooks them up to dma-buf's get_uuid callback. Signed-off-by: David Stevens <stevensd@chromium.org> --- drivers/gpu/drm/virtio/virtgpu_drv.c | 3 ++ drivers/gpu/drm/virtio/virtgpu_drv.h | 18 +++++++++ drivers/gpu/drm/virtio/virtgpu_kms.c | 4 ++ drivers/gpu/drm/virtio/virtgpu_prime.c | 41 +++++++++++++++++-- drivers/gpu/drm/virtio/virtgpu_vq.c | 55 ++++++++++++++++++++++++++ 5 files changed, 118 insertions(+), 3 deletions(-)