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

[Luben Tuikov]

From: Christian König <christian.koe...@amd.com>

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

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 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(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c 
b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index bc9c432edffe03..45ce2d1f754cc4 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 9a7e50534b84bb..c420d1ab605b6f 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;
        }
-- 
2.36.1.74.g277cf0bc36