drm/ttm: make some inline helper functions for cleanup paths. (v2)

The disable path is just temporary for now, it will be dropped once has_type
is gone in a later patch.

v2: add docs.
rename to ttm_mem_type_manager namespace
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200804025632.3868079-26-airlied@gmail.com

drivers/gpu/drm/ttm/ttm_bo.c

@@ -1466,8 +1466,7 @@ int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
 		return ret;
 	}
 
-	man->use_type = false;
-	man->has_type = false;
+	ttm_mem_type_manager_disable(man);
 
 	ret = 0;
 	if (mem_type > 0) {
@@ -1480,8 +1479,7 @@ int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
 		ret = (*man->func->takedown)(man);
 	}
 
-	dma_fence_put(man->move);
-	man->move = NULL;
+	ttm_mem_type_manager_cleanup(man);
 
 	return ret;
 }

include/drm/ttm/ttm_bo_driver.h

@@ -691,6 +691,32 @@ static inline void ttm_mem_type_manager_set_used(struct ttm_mem_type_manager *ma
 	man->use_type = used;
 }
 
+/**
+ * ttm_mem_type_manager_disable.
+ *
+ * @man: A memory manager object.
+ *
+ * Indicate the manager is not to be used and deregistered. (temporary during rework).
+ */
+static inline void ttm_mem_type_manager_disable(struct ttm_mem_type_manager *man)
+{
+	man->has_type = false;
+	man->use_type = false;
+}
+
+/**
+ * ttm_mem_type_manager_cleanup
+ *
+ * @man: A memory manager object.
+ *
+ * Cleanup the move fences from the memory manager object.
+ */
+static inline void ttm_mem_type_manager_cleanup(struct ttm_mem_type_manager *man)
+{
+	dma_fence_put(man->move);
+	man->move = NULL;
+}
+
 /*
  * ttm_bo_util.c
  */