drm/ttm: add ttm_bo_move_to_lru_tail function v2

This allows the drivers to move a BO to the end of the LRU
without removing and adding it again.

v2: Make it more robust, handle pinned and swapable BOs as well.

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 3ea9a01c960c..4cbf26555093 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -228,6 +228,27 @@ 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 (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
+                list_del_init(&bo->swap);
+                list_del_init(&bo->lru);
+
+        } else {
+                if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
+                        list_move_tail(&bo->swap, &bo->glob->swap_lru);
+
+                man = &bdev->man[bo->mem.mem_type];
+                list_move_tail(&bo->lru, &man->lru);
+        }
+}
+EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
+
 /*
  * Call bo->mutex locked.
  */