drm/ttm: implement LRU add callbacks v2

This allows fine grained control for the driver where to add a BO into the LRU.

v2: fix typo in comment

Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_bo.c

@@ -164,7 +164,6 @@ static void ttm_bo_release_list(struct kref *list_kref)
 void ttm_bo_add_to_lru(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);
 
@@ -172,12 +171,11 @@ void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 
 		BUG_ON(!list_empty(&bo->lru));
 
-		man = &bdev->man[bo->mem.mem_type];
-		list_add_tail(&bo->lru, &man->lru);
+		list_add(&bo->lru, bdev->driver->lru_tail(bo));
 		kref_get(&bo->list_kref);
 
 		if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
-			list_add_tail(&bo->swap, &bo->glob->swap_lru);
+			list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
 			kref_get(&bo->list_kref);
 		}
 	}
@@ -230,7 +228,6 @@ 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);
 
@@ -242,15 +239,29 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 		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);
+		if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
+			list_del(&bo->swap);
+			list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
+		}
 
-		man = &bdev->man[bo->mem.mem_type];
-		list_move_tail(&bo->lru, &man->lru);
+		list_del(&bo->lru);
+		list_add(&bo->lru, bdev->driver->lru_tail(bo));
 	}
 }
 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 
+struct list_head *ttm_bo_default_lru_tail(struct ttm_buffer_object *bo)
+{
+	return bo->bdev->man[bo->mem.mem_type].lru.prev;
+}
+EXPORT_SYMBOL(ttm_bo_default_lru_tail);
+
+struct list_head *ttm_bo_default_swap_lru_tail(struct ttm_buffer_object *bo)
+{
+	return bo->glob->swap_lru.prev;
+}
+EXPORT_SYMBOL(ttm_bo_default_swap_lru_tail);
+
 /*
  * Call bo->mutex locked.
  */