drm/virtio: implement blob resources: blob display integration

SCANOUT_BLOB forwards the DRM framebuffer metadata to the host. The
modifier is intentionally left out -- it may be possible to query
the host for that.

We also assume one blob resource per DRM framebuffer.  That too is
an intentional simplification.
Signed-off-by: NGurchetan Singh <gurchetansingh@chromium.org>
Acked-by: NTomeu Vizoso <tomeu.vizoso@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200924003214.662-14-gurchetansingh@chromium.orgSigned-off-by: NGerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_plane.c

@@ -174,12 +174,23 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 			  plane->state->src_h >> 16,
 			  plane->state->src_x >> 16,
 			  plane->state->src_y >> 16);
-		virtio_gpu_cmd_set_scanout(vgdev, output->index,
-					   bo->hw_res_handle,
-					   plane->state->src_w >> 16,
-					   plane->state->src_h >> 16,
-					   plane->state->src_x >> 16,
-					   plane->state->src_y >> 16);
+
+		if (bo->host3d_blob || bo->guest_blob) {
+			virtio_gpu_cmd_set_scanout_blob
+						(vgdev, output->index, bo,
+						 plane->state->fb,
+						 plane->state->src_w >> 16,
+						 plane->state->src_h >> 16,
+						 plane->state->src_x >> 16,
+						 plane->state->src_y >> 16);
+		} else {
+			virtio_gpu_cmd_set_scanout(vgdev, output->index,
+						   bo->hw_res_handle,
+						   plane->state->src_w >> 16,
+						   plane->state->src_h >> 16,
+						   plane->state->src_x >> 16,
+						   plane->state->src_y >> 16);
+		}
 	}
 
 	virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle,