drm/virtio: batch plane updates (pageflip)

Move virtio_gpu_notify() to higher-level functions for
virtio_gpu_cmd_resource_flush(), virtio_gpu_cmd_set_scanout() and
virtio_gpu_cmd_transfer_to_host_{2d,3d}().

virtio_gpu_primary_plane_update() will notify only once for a series
of commands (restores plane update command batching).

Signed-off-by: Gerd Hoffmann <[e-mail]>
Reviewed-by: Chia-I Wu <[e-mail]>
Reviewed-by: Gurchetan Singh <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/virtio/virtgpu_display.c

···
 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0,
 				   crtc->mode.hdisplay,
 				   crtc->mode.vdisplay, 0, 0);
+	virtio_gpu_notify(vgdev);
 }
 
 static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
···
 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 
 	virtio_gpu_cmd_set_scanout(vgdev, output->index, 0, 0, 0, 0, 0);
+	virtio_gpu_notify(vgdev);
 	output->enabled = false;
 }
 

drivers/gpu/drm/virtio/virtgpu_ioctl.c

···
 			 args->level, &args->box, objs, fence);
 		dma_fence_put(&fence->f);
 	}
+	virtio_gpu_notify(vgdev);
 	return 0;
 
 err_unlock:

drivers/gpu/drm/virtio/virtgpu_plane.c

···
 					   plane->state->src_w >> 16,
 					   plane->state->src_h >> 16,
 					   0, 0);
+		virtio_gpu_notify(vgdev);
 		return;
 	}
 
···
 				      rect.y1,
 				      rect.x2 - rect.x1,
 				      rect.y2 - rect.y1);
+	virtio_gpu_notify(vgdev);
 }
 
 static int virtio_gpu_cursor_prepare_fb(struct drm_plane *plane,
···
 			 plane->state->crtc_w,
 			 plane->state->crtc_h,
 			 0, 0, objs, vgfb->fence);
+		virtio_gpu_notify(vgdev);
 		dma_fence_wait(&vgfb->fence->f, true);
 		dma_fence_put(&vgfb->fence->f);
 		vgfb->fence = NULL;

drivers/gpu/drm/virtio/virtgpu_vq.c

···
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev,
···
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev,
···
 	cmd_p->r.y = cpu_to_le32(y);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 static void
···
 	cmd_p->level = cpu_to_le32(level);
 
 	virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
-	virtio_gpu_notify(vgdev);
 }
 
 void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev,