drm/ttm: split the mm manager init code (v2)

This will allow the driver to control the ordering here better.

Eventually the old path will be removed.

v2: add docs for new APIs.
rename new path to ttm_mem_type_manager_init/set_used(for now)
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200804025632.3868079-14-airlied@gmail.com

drivers/gpu/drm/ttm/ttm_bo.c

@@ -1507,35 +1507,41 @@ int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
 }
 EXPORT_SYMBOL(ttm_bo_evict_mm);
 
-int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
+void ttm_mem_type_manager_init(struct ttm_bo_device *bdev,
+			       struct ttm_mem_type_manager *man,
 			       unsigned long p_size)
 {
-	int ret;
-	struct ttm_mem_type_manager *man;
 	unsigned i;
 
-	BUG_ON(type >= TTM_NUM_MEM_TYPES);
-	man = &bdev->man[type];
 	BUG_ON(man->has_type);
 	man->use_io_reserve_lru = false;
 	mutex_init(&man->io_reserve_mutex);
 	spin_lock_init(&man->move_lock);
 	INIT_LIST_HEAD(&man->io_reserve_lru);
 	man->bdev = bdev;
-
-	if (type != TTM_PL_SYSTEM) {
-		ret = (*man->func->init)(man, p_size);
-		if (ret)
-			return ret;
-	}
-	man->has_type = true;
-	man->use_type = true;
 	man->size = p_size;
 
 	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
 		INIT_LIST_HEAD(&man->lru[i]);
 	man->move = NULL;
+}
+EXPORT_SYMBOL(ttm_mem_type_manager_init);
 
+int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
+		   unsigned long p_size)
+{
+	int ret;
+	struct ttm_mem_type_manager *man;
+
+	BUG_ON(type >= TTM_NUM_MEM_TYPES);
+	ttm_mem_type_manager_init(bdev, &bdev->man[type], p_size);
+
+	if (type != TTM_PL_SYSTEM) {
+		ret = (*man->func->init)(man, p_size);
+		if (ret)
+			return ret;
+	}
+	ttm_mem_type_manager_set_used(man, true);
 	return 0;
 }
 EXPORT_SYMBOL(ttm_bo_init_mm);

include/drm/ttm/ttm_bo_api.h

@@ -54,6 +54,8 @@ struct ttm_place;
 
 struct ttm_lru_bulk_move;
 
+struct ttm_mem_type_manager;
+
 /**
  * struct ttm_bus_placement
  *
@@ -531,6 +533,19 @@ int ttm_bo_create(struct ttm_bo_device *bdev, unsigned long size,
 		  uint32_t page_alignment, bool interruptible,
 		  struct ttm_buffer_object **p_bo);
 
+/**
+ * ttm_mem_type_manager_init
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @man: memory manager object to init
+ * @p_size: size managed area in pages.
+ *
+ * Initialise core parts of a a manager object.
+ */
+void ttm_mem_type_manager_init(struct ttm_bo_device *bdev,
+			       struct ttm_mem_type_manager *man,
+			       unsigned long p_size);
+
 /**
  * ttm_bo_init_mm
  *

include/drm/ttm/ttm_bo_driver.h

@@ -689,6 +689,21 @@ static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 	dma_resv_unlock(bo->base.resv);
 }
 
+/**
+ * ttm_mem_type_manager_set_used
+ *
+ * @man: A memory manager object.
+ * @used: usage state to set.
+ *
+ * Set the manager in use flag. If disabled the manager is no longer
+ * used for object placement.
+ */
+static inline void ttm_mem_type_manager_set_used(struct ttm_mem_type_manager *man, bool used)
+{
+	man->has_type = true;
+	man->use_type = used;
+}
+
 /*
  * ttm_bo_util.c
  */