From: Christian König <christian.koenig@xxxxxxx>
This allows the drivers to move a BO to the end of the LRU
without removing and adding it again.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Chunming Zhou <David1.Zhou@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 20 ++++++++++++++++++++
include/drm/ttm/ttm_bo_api.h | 10 ++++++++++
2 files changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 745e996..9e91cc3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -228,6 +228,26 @@ void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
}
EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
+void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
+{
+ struct ttm_bo_device *bdev = bo->bdev;
+ struct ttm_mem_type_manager *man;
+
+ lockdep_assert_held(&bo->resv->lock.base);
+
+ if (!list_empty(&bo->swap)) {
+ list_del(&bo->swap);
+ list_add_tail(&bo->swap, &bo->glob->swap_lru);
+ }
+
+ if (!list_empty(&bo->lru)) {
+ man = &bdev->man[bo->mem.mem_type];
+ list_del(&bo->lru);
+ list_add_tail(&bo->lru, &man->lru);
+ }
+}
+EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
+
/*
* Call bo->mutex locked.
*/
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index c768ddf..afae231 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
--
2.5.0
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