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drm/virtio: Implement VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING cmd

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This cmd is useful to let the VMM (i.e, Qemu) know that the backing
store associated with a resource is no longer valid, so that the VMM
can perform any cleanup or unmap operations.

The fence related changes and virtio_gpu_object_detach()/
virtio_gpu_detach_object_fenced() routines are extracted from a
patch by Dmitry Osipenko <dmitry.osipenko@collabora.com>.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Gurchetan Singh <gurchetansingh@chromium.org>
Cc: Chia-I Wu <olvaffe@gmail.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241126031643.3490496-2-vivek.kasireddy@intel.com
This commit is contained in:
Vivek Kasireddy
2024-11-25 19:13:42 -08:00
committed by Dmitry Osipenko
parent c1bae6802e
commit 06a0f77195
3 changed files with 61 additions and 0 deletions
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21
drivers/gpu/drm/virtio/virtgpu_object.c
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@@ -97,6 +97,27 @@ static void virtio_gpu_free_object(struct drm_gem_object *obj)
virtio_gpu_cleanup_object(bo);
}
int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo)
{
struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
struct virtio_gpu_fence *fence;
if (!bo->attached)
return 0;
fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
if (!fence)
return -ENOMEM;
virtio_gpu_object_detach(vgdev, bo, fence);
virtio_gpu_notify(vgdev);
dma_fence_wait(&fence->f, false);
dma_fence_put(&fence->f);
return 0;
}
static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
.free = virtio_gpu_free_object,
.open = virtio_gpu_gem_object_open,