[PATCH 2/5] drm/virtio: add uapi for in and out explicit fences

[Gerd Hoffmann]

  Hi,

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

>  #define DRM_IOCTL_VIRTGPU_EXECBUFFER \
> -	DRM_IOW(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
> +	DRM_IOWR(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
>  		struct drm_virtgpu_execbuffer)

That changes the ioctl number and breaks the userspace api.

cheers,
  Gerd