drm/ttm: add lru notify to bo driver v2

allow driver do somethings when lru changed.
v2:
address Michel's comments.

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 1021106438b2..15829b24277c 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -381,6 +381,15 @@ struct ttm_bo_driver {
          */
         int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
                              void *buf, int len, int write);
+
+        /**
+         * struct ttm_bo_driver member del_from_lru_notify
+         *
+         * @bo: the buffer object deleted from lru
+         *
+         * notify driver that a BO was deleted from LRU.
+         */
+        void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
 };
 
 /**