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drm/virtio: add uapi for in and out explicit fences

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Add a new field called fence_fd that will be used by userspace to send
in-fences to the kernel and receive out-fences created by the kernel.

This uapi enables virtio to take advantage of explicit synchronization of
dma-bufs.

There are two new flags:

* VIRTGPU_EXECBUF_FENCE_FD_IN to be used when passing an in-fence fd.
* VIRTGPU_EXECBUF_FENCE_FD_OUT to be used when requesting an out-fence fd

The execbuffer IOCTL is now read-write to allow the userspace to read the
out-fence.

On error -1 should be returned in the fence_fd field.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20181112165157.32765-3-robert.foss@collabora.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Robert Foss
2018-11-12 17:51:55 +01:00
committed by Gerd Hoffmann
parent 9fdd90c0f4
commit a56f9c868c
2 changed files with 15 additions and 3 deletions
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5
drivers/gpu/drm/virtio/virtgpu_ioctl.c
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@@ -119,6 +119,11 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
if (vgdev->has_virgl_3d == false)
return -ENOSYS;
if ((exbuf->flags & ~VIRTGPU_EXECBUF_FLAGS))
return -EINVAL;
exbuf->fence_fd = -1;
INIT_LIST_HEAD(&validate_list);
if (exbuf->num_bo_handles) {