drm/ttm: Provide ttm_bo_global_{init/release}() for struct ttm_bo_global

So far, struct ttm_bo_global_ref was the only way of initializing a struct
ttm_bo_global. Providing separate initializer and release functions for
struct ttm_bo_global gives drivers the option of implementing their own
init and release callbacks for drm_global_references of type
DRM_GLOBAL_TTM_BO.

The original functions for initializing and releasing via struct
ttm_bo_global_ref are wrappers around the new interfaces.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_bo.c

@@ -1522,26 +1522,22 @@ static void ttm_bo_global_kobj_release(struct kobject *kobj)
 	kfree(glob);
 }
 
-void ttm_bo_global_ref_release(struct drm_global_reference *ref)
+void ttm_bo_global_release(struct ttm_bo_global *glob)
 {
-	struct ttm_bo_global *glob = ref->object;
-
 	kobject_del(&glob->kobj);
 	kobject_put(&glob->kobj);
 }
-EXPORT_SYMBOL(ttm_bo_global_ref_release);
+EXPORT_SYMBOL(ttm_bo_global_release);
 
-int ttm_bo_global_ref_init(struct drm_global_reference *ref)
+int ttm_bo_global_init(struct ttm_bo_global *glob,
+		       struct ttm_mem_global *mem_glob)
 {
-	struct ttm_bo_global_ref *bo_ref =
-		container_of(ref, struct ttm_bo_global_ref, ref);
-	struct ttm_bo_global *glob = ref->object;
 	int ret;
 	unsigned i;
 
 	mutex_init(&glob->device_list_mutex);
 	spin_lock_init(&glob->lru_lock);
-	glob->mem_glob = bo_ref->mem_glob;
+	glob->mem_glob = mem_glob;
 	glob->mem_glob->bo_glob = glob;
 	glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
 
@@ -1564,7 +1560,7 @@ int ttm_bo_global_ref_init(struct drm_global_reference *ref)
 	kfree(glob);
 	return ret;
 }
-EXPORT_SYMBOL(ttm_bo_global_ref_init);
+EXPORT_SYMBOL(ttm_bo_global_init);
 
 
 int ttm_bo_device_release(struct ttm_bo_device *bdev)

include/drm/ttm/ttm_bo_driver.h

@@ -384,15 +384,6 @@ struct ttm_bo_driver {
 			     void *buf, int len, int write);
 };
 
-/**
- * struct ttm_bo_global_ref - Argument to initialize a struct ttm_bo_global.
- */
-
-struct ttm_bo_global_ref {
-	struct drm_global_reference ref;
-	struct ttm_mem_global *mem_glob;
-};
-
 /**
  * struct ttm_bo_global - Buffer object driver global data.
  *
@@ -578,8 +569,9 @@ 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_ref_release(struct drm_global_reference *ref);
-int ttm_bo_global_ref_init(struct drm_global_reference *ref);
+void ttm_bo_global_release(struct ttm_bo_global *glob);
+int ttm_bo_global_init(struct ttm_bo_global *glob,
+		       struct ttm_mem_global *mem_glob);
 
 int ttm_bo_device_release(struct ttm_bo_device *bdev);
 
@@ -897,4 +889,43 @@ pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp);
 
 extern const struct ttm_mem_type_manager_func ttm_bo_manager_func;
 
+/**
+ * struct ttm_bo_global_ref - Argument to initialize a struct ttm_bo_global.
+ */
+
+struct ttm_bo_global_ref {
+	struct drm_global_reference ref;
+	struct ttm_mem_global *mem_glob;
+};
+
+/**
+ * ttm_bo_global_ref_init
+ *
+ * @ref: DRM global reference
+ *
+ * Helper function that initializes a struct ttm_bo_global. This function
+ * is used as init call-back function for DRM global references of type
+ * DRM_GLOBAL_TTM_BO_REF.
+ */
+static inline int ttm_bo_global_ref_init(struct drm_global_reference *ref)
+{
+	struct ttm_bo_global_ref *bo_ref =
+		container_of(ref, struct ttm_bo_global_ref, ref);
+	return ttm_bo_global_init(ref->object, bo_ref->mem_glob);
+}
+
+/**
+ * ttm_bo_global_ref_release
+ *
+ * @ref: DRM global reference
+ *
+ * Helper function that releases a struct ttm_bo_global. This function
+ * is used as release call-back function for DRM global references of type
+ * DRM_GLOBAL_TTM_BO_REF.
+ */
+static inline void ttm_bo_global_ref_release(struct drm_global_reference *ref)
+{
+	ttm_bo_global_release(ref->object);
+}
+
 #endif