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-rw-r--r--include/drm/ttm/ttm_bo_api.h10
-rw-r--r--include/drm/ttm/ttm_bo_driver.h4
2 files changed, 12 insertions, 2 deletions
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index c768ddfbe..afae2316b 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -383,6 +383,16 @@ extern void ttm_bo_add_to_lru(struct ttm_buffer_object *bo);
*/
extern int ttm_bo_del_from_lru(struct ttm_buffer_object *bo);
+/**
+ * ttm_bo_move_to_lru_tail
+ *
+ * @bo: The buffer object.
+ *
+ * Move this BO to the tail of all lru lists used to lookup and reserve an
+ * object. This function must be called with struct ttm_bo_global::lru_lock
+ * held, and is used to make a BO less likely to be considered for eviction.
+ */
+extern void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
/**
* ttm_bo_lock_delayed_workqueue
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 813042ced..3d4bf08aa 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -826,10 +826,10 @@ static inline int __ttm_bo_reserve(struct ttm_buffer_object *bo,
* reserved, the validation sequence is checked against the validation
* sequence of the process currently reserving the buffer,
* and if the current validation sequence is greater than that of the process
- * holding the reservation, the function returns -EAGAIN. Otherwise it sleeps
+ * holding the reservation, the function returns -EDEADLK. Otherwise it sleeps
* waiting for the buffer to become unreserved, after which it retries
* reserving.
- * The caller should, when receiving an -EAGAIN error
+ * The caller should, when receiving an -EDEADLK error
* release all its buffer reservations, wait for @bo to become unreserved, and
* then rerun the validation with the same validation sequence. This procedure
* will always guarantee that the process with the lowest validation sequence