Merge tag 'drm-misc-fixes-2022-06-16' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

Two fixes for TTM, one for a NULL pointer dereference and one to make sure
the buffer is pinned prior to a bulk move, and a fix for a spurious
compiler warning.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220616072519.qwrsefsemejefowu@houat

1 files changed, 36 insertions, 16 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
index 65889b3caf50..20f9adcc3235 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -91,8 +91,8 @@ static void ttm_lru_bulk_move_pos_tail(struct ttm_lru_bulk_move_pos *pos,
 }
 
 /* Add the resource to a bulk_move cursor */
-void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk,
-			   struct ttm_resource *res)
+static void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk,
+				  struct ttm_resource *res)
 {
 	struct ttm_lru_bulk_move_pos *pos = ttm_lru_bulk_move_pos(bulk, res);
 
@@ -105,8 +105,8 @@ void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk,
 }
 
 /* Remove the resource from a bulk_move range */
-void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk,
-			   struct ttm_resource *res)
+static void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk,
+				  struct ttm_resource *res)
 {
 	struct ttm_lru_bulk_move_pos *pos = ttm_lru_bulk_move_pos(bulk, res);
 
@@ -122,6 +122,22 @@ void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk,
 	}
 }
 
+/* Add the resource to a bulk move if the BO is configured for it */
+void ttm_resource_add_bulk_move(struct ttm_resource *res,
+				struct ttm_buffer_object *bo)
+{
+	if (bo->bulk_move && !bo->pin_count)
+		ttm_lru_bulk_move_add(bo->bulk_move, res);
+}
+
+/* Remove the resource from a bulk move if the BO is configured for it */
+void ttm_resource_del_bulk_move(struct ttm_resource *res,
+				struct ttm_buffer_object *bo)
+{
+	if (bo->bulk_move && !bo->pin_count)
+		ttm_lru_bulk_move_del(bo->bulk_move, res);
+}
+
 /* Move a resource to the LRU or bulk tail */
 void ttm_resource_move_to_lru_tail(struct ttm_resource *res)
 {
@@ -169,15 +185,14 @@ void ttm_resource_init(struct ttm_buffer_object *bo,
 	res->bus.is_iomem = false;
 	res->bus.caching = ttm_cached;
 	res->bo = bo;
-	INIT_LIST_HEAD(&res->lru);
 
 	man = ttm_manager_type(bo->bdev, place->mem_type);
 	spin_lock(&bo->bdev->lru_lock);
-	man->usage += res->num_pages << PAGE_SHIFT;
-	if (bo->bulk_move)
-		ttm_lru_bulk_move_add(bo->bulk_move, res);
+	if (bo->pin_count)
+		list_add_tail(&res->lru, &bo->bdev->pinned);
 	else
-		ttm_resource_move_to_lru_tail(res);
+		list_add_tail(&res->lru, &man->lru[bo->priority]);
+	man->usage += res->num_pages << PAGE_SHIFT;
 	spin_unlock(&bo->bdev->lru_lock);
 }
 EXPORT_SYMBOL(ttm_resource_init);
@@ -210,8 +225,16 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
 {
 	struct ttm_resource_manager *man =
 		ttm_manager_type(bo->bdev, place->mem_type);
+	int ret;
+
+	ret = man->func->alloc(man, bo, place, res_ptr);
+	if (ret)
+		return ret;
 
-	return man->func->alloc(man, bo, place, res_ptr);
+	spin_lock(&bo->bdev->lru_lock);
+	ttm_resource_add_bulk_move(*res_ptr, bo);
+	spin_unlock(&bo->bdev->lru_lock);
+	return 0;
 }
 
 void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
@@ -221,12 +244,9 @@ void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
 	if (!*res)
 		return;
 
-	if (bo->bulk_move) {
-		spin_lock(&bo->bdev->lru_lock);
-		ttm_lru_bulk_move_del(bo->bulk_move, *res);
-		spin_unlock(&bo->bdev->lru_lock);
-	}
-
+	spin_lock(&bo->bdev->lru_lock);
+	ttm_resource_del_bulk_move(*res, bo);
+	spin_unlock(&bo->bdev->lru_lock);
 	man = ttm_manager_type(bo->bdev, (*res)->mem_type);
 	man->func->free(man, *res);
 	*res = NULL;