From 06a0f77195c6cb34c193b3eaeffc11060f043e7a Mon Sep 17 00:00:00 2001 From: Vivek Kasireddy Date: Mon, 25 Nov 2024 19:13:42 -0800 Subject: drm/virtio: Implement VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING cmd This cmd is useful to let the VMM (i.e, Qemu) know that the backing store associated with a resource is no longer valid, so that the VMM can perform any cleanup or unmap operations.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 . Cc: Gerd Hoffmann Cc: Dmitry Osipenko Cc: Rob Clark Cc: Gurchetan Singh Cc: Chia-I Wu Signed-off-by: Vivek Kasireddy Tested-by: Dmitry Osipenko Reviewed-by: Dmitry Osipenko Signed-off-by: Dmitry Osipenko Link: https://patchwork.freedesktop.org/patch/msgid/20241126031643.3490496-2-vivek.kasireddy@intel.com --- drivers/gpu/drm/virtio/virtgpu_object.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'drivers/gpu/drm/virtio/virtgpu_object.c') diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c index c7e74cf13022..d18263ddd972 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -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, -- cgit v1.2.3