drm/virtgpu: Set PRIME export function in struct drm_gem_object_funcs

GEM object functions deprecate several similar callback interfaces in
struct drm_driver. This patch replaces virtgpu's per-driver PRIME export
function with a per-object function.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200923102159.24084-19-tzimmermann@suse.de

drivers/gpu/drm/virtio/virtgpu_drv.c

@@ -203,7 +203,6 @@ static struct drm_driver driver = {
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_mmap = drm_gem_prime_mmap,
-	.gem_prime_export = virtgpu_gem_prime_export,
 	.gem_prime_import = virtgpu_gem_prime_import,
 	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
 

drivers/gpu/drm/virtio/virtgpu_object.c

@@ -108,6 +108,7 @@ static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 	.close = virtio_gpu_gem_object_close,
 
 	.print_info = drm_gem_shmem_print_info,
+	.export = virtgpu_gem_prime_export,
 	.pin = drm_gem_shmem_pin,
 	.unpin = drm_gem_shmem_unpin,
 	.get_sg_table = drm_gem_shmem_get_sg_table,