[1/3] drm/i915: audit bo->resource usage v2

Commit Message

Christian König Aug. 31, 2022, 9:34 a.m. UTC

Make sure we can at least move and alloc TT objects without backing store.

v2: clear the tt object even when no resource is allocated.

Signed-off-by: Christian König <[e-mail]>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c      | 6 ++----
 drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c | 2 +-
 2 files changed, 3 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index bc9c432edffe..a81063e5aa93 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -271,8 +271,6 @@  static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,
 {
 	struct drm_i915_private *i915 = container_of(bo->bdev, typeof(*i915),
 						     bdev);
-	struct ttm_resource_manager *man =
-		ttm_manager_type(bo->bdev, bo->resource->mem_type);
 	struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
 	unsigned long ccs_pages = 0;
 	enum ttm_caching caching;
@@ -286,8 +284,8 @@  static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,
 	if (!i915_tt)
 		return NULL;
 
-	if (obj->flags & I915_BO_ALLOC_CPU_CLEAR &&
-	    man->use_tt)
+	if (obj->flags & I915_BO_ALLOC_CPU_CLEAR && (!bo->resource ||
+	    ttm_manager_type(bo->bdev, bo->resource->mem_type)->use_tt))
 		page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
 
 	caching = i915_ttm_select_tt_caching(obj);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
index 9a7e50534b84..c420d1ab605b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
@@ -560,7 +560,7 @@  int i915_ttm_move(struct ttm_buffer_object *bo, bool evict,
 	bool clear;
 	int ret;
 
-	if (GEM_WARN_ON(!obj)) {
+	if (GEM_WARN_ON(!obj) || !bo->resource) {
 		ttm_bo_move_null(bo, dst_mem);
 		return 0;
 	}