drm/virtio: remove prime pin/unpin callbacks.

virtio-gpu objects never move around, so effectively they are
pinned all the time.  Therefore we don't need the (optional)
pin/unpin callbacks.  Remove them.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20190227144441.6755-3-kraxel@redhat.com

drivers/gpu/drm/virtio/virtgpu_drv.c

@@ -207,8 +207,6 @@ static struct drm_driver driver = {
 #endif
 	.gem_prime_export = drm_gem_prime_export,
 	.gem_prime_import = drm_gem_prime_import,
-	.gem_prime_pin = virtgpu_gem_prime_pin,
-	.gem_prime_unpin = virtgpu_gem_prime_unpin,
 	.gem_prime_vmap = virtgpu_gem_prime_vmap,
 	.gem_prime_vunmap = virtgpu_gem_prime_vunmap,
 	.gem_prime_mmap = virtgpu_gem_prime_mmap,

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -352,8 +352,6 @@ void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo);
 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait);
 
 /* virtgpu_prime.c */
-int virtgpu_gem_prime_pin(struct drm_gem_object *obj);
-void virtgpu_gem_prime_unpin(struct drm_gem_object *obj);
 void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj);
 void virtgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,

drivers/gpu/drm/virtio/virtgpu_prime.c

@@ -28,17 +28,6 @@
  * device that might share buffers with virtgpu
  */
 
-int virtgpu_gem_prime_pin(struct drm_gem_object *obj)
-{
-	WARN_ONCE(1, "not implemented");
-	return -ENODEV;
-}
-
-void virtgpu_gem_prime_unpin(struct drm_gem_object *obj)
-{
-	WARN_ONCE(1, "not implemented");
-}
-
 void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
 {
 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);