drm/ttm: use a static ttm_bo_global instance

As the name says we only need one global instance of ttm_bo_global.

Just use a single exported instance which is save to initialize multiple times.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 9cec8835b88f..26be74939f10 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -398,7 +398,7 @@ struct ttm_bo_driver {
  * @swap_lru: Lru list of buffer objects used for swapping.
  */
 
-struct ttm_bo_global {
+extern struct ttm_bo_global {
 
         /**
          * Constant after init.
@@ -410,8 +410,9 @@ struct ttm_bo_global {
         spinlock_t lru_lock;
 
         /**
-         * Protected by device_list_mutex.
+         * Protected by ttm_global_mutex.
          */
+        unsigned int use_count;
         struct list_head device_list;
 
         /**
@@ -423,7 +424,7 @@ struct ttm_bo_global {
          * Internal protection.
          */
         atomic_t bo_count;
-};
+} ttm_bo_glob;
 
 
 #define TTM_NUM_MEM_TYPES 8
@@ -568,8 +569,8 @@ void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem);
 void ttm_bo_mem_put_locked(struct ttm_buffer_object *bo,
                            struct ttm_mem_reg *mem);
 
-void ttm_bo_global_release(struct ttm_bo_global *glob);
-int ttm_bo_global_init(struct ttm_bo_global *glob);
+void ttm_bo_global_release(void);
+int ttm_bo_global_init(void);
 
 int ttm_bo_device_release(struct ttm_bo_device *bdev);
 
@@ -906,7 +907,7 @@ struct ttm_bo_global_ref {
  */
 static inline int ttm_bo_global_ref_init(struct drm_global_reference *ref)
 {
-        return ttm_bo_global_init(ref->object);
+        return ttm_bo_global_init();
 }
 
 /**
@@ -920,7 +921,7 @@ static inline int ttm_bo_global_ref_init(struct drm_global_reference *ref)
  */
 static inline void ttm_bo_global_ref_release(struct drm_global_reference *ref)
 {
-        ttm_bo_global_release(ref->object);
+        ttm_bo_global_release();
 }
 
 #endif