drm/ttm: always initialize the full ttm_resource v2

Init all fields in ttm_resource_alloc() when we create a new resource.

v2: use place->mem_type instead of res->mem_type
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430092508.60710-2-christian.koenig@amd.com

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -1018,8 +1018,6 @@ int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
 	} else {
 
 		/* allocate GART space */
-		tmp = bo->mem;
-		tmp.mm_node = NULL;
 		placement.num_placement = 1;
 		placement.placement = &placements;
 		placement.num_busy_placement = 1;

drivers/gpu/drm/ttm/ttm_bo.c

@@ -507,11 +507,6 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
 		return ttm_tt_create(bo, false);
 	}
 
-	evict_mem = bo->mem;
-	evict_mem.mm_node = NULL;
-	evict_mem.bus.offset = 0;
-	evict_mem.bus.addr = NULL;
-
 	ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 	if (ret) {
 		if (ret != -ERESTARTSYS) {
@@ -867,12 +862,8 @@ static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
 				     struct ttm_place *hop)
 {
 	struct ttm_placement hop_placement;
+	struct ttm_resource hop_mem;
 	int ret;
-	struct ttm_resource hop_mem = *mem;
-
-	hop_mem.mm_node = NULL;
-	hop_mem.mem_type = TTM_PL_SYSTEM;
-	hop_mem.placement = 0;
 
 	hop_placement.num_placement = hop_placement.num_busy_placement = 1;
 	hop_placement.placement = hop_placement.busy_placement = hop;
@@ -894,19 +885,14 @@ static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 			      struct ttm_placement *placement,
 			      struct ttm_operation_ctx *ctx)
 {
-	int ret = 0;
 	struct ttm_place hop;
 	struct ttm_resource mem;
+	int ret;
 
 	dma_resv_assert_held(bo->base.resv);
 
 	memset(&hop, 0, sizeof(hop));
 
-	mem.num_pages = PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT;
-	mem.bus.offset = 0;
-	mem.bus.addr = NULL;
-	mem.mm_node = NULL;
-
 	/*
 	 * Determine where to move the buffer.
 	 *
@@ -1027,6 +1013,7 @@ int ttm_bo_init_reserved(struct ttm_device *bdev,
 			 struct dma_resv *resv,
 			 void (*destroy) (struct ttm_buffer_object *))
 {
+	static const struct ttm_place sys_mem = { .mem_type = TTM_PL_SYSTEM };
 	bool locked;
 	int ret = 0;
 
@@ -1038,13 +1025,8 @@ int ttm_bo_init_reserved(struct ttm_device *bdev,
 	bo->bdev = bdev;
 	bo->type = type;
 	bo->page_alignment = page_alignment;
-	bo->mem.mem_type = TTM_PL_SYSTEM;
-	bo->mem.num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	bo->mem.mm_node = NULL;
-	bo->mem.bus.offset = 0;
-	bo->mem.bus.addr = NULL;
+	ttm_resource_alloc(bo, &sys_mem, &bo->mem);
 	bo->moving = NULL;
-	bo->mem.placement = 0;
 	bo->pin_count = 0;
 	bo->sg = sg;
 	if (resv) {

drivers/gpu/drm/ttm/ttm_bo_util.c

@@ -664,6 +664,7 @@ EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
 
 int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
 {
+	static const struct ttm_place sys_mem = { .mem_type = TTM_PL_SYSTEM };
 	struct ttm_buffer_object *ghost;
 	int ret;
 
@@ -676,8 +677,7 @@ int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
 	if (ret)
 		ttm_bo_wait(bo, false, false);
 
-	memset(&bo->mem, 0, sizeof(bo->mem));
-	bo->mem.mem_type = TTM_PL_SYSTEM;
+	ttm_resource_alloc(bo, &sys_mem, &bo->mem);
 	bo->ttm = NULL;
 
 	dma_resv_unlock(&ghost->base._resv);

drivers/gpu/drm/ttm/ttm_resource.c

@@ -30,9 +30,18 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
 		       struct ttm_resource *res)
 {
 	struct ttm_resource_manager *man =
-		ttm_manager_type(bo->bdev, res->mem_type);
+		ttm_manager_type(bo->bdev, place->mem_type);
 
 	res->mm_node = NULL;
+	res->start = 0;
+	res->num_pages = PFN_UP(bo->base.size);
+	res->mem_type = place->mem_type;
+	res->placement = place->flags;
+	res->bus.addr = NULL;
+	res->bus.offset = 0;
+	res->bus.is_iomem = false;
+	res->bus.caching = ttm_cached;
+
 	return man->func->alloc(man, bo, place, res);
 }