drm/ttm: add unlocked variant of new manager put node.

We need the unlocked variant for the new codepath introduced to fix the
race condition in master recently.

Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/ttm/ttm_bo.c

@@ -464,9 +464,7 @@ static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 		spin_lock(&glob->lru_lock);
 	}
 
-	if (bo->mem.mm_node) {
-		ttm_bo_mem_put(bo, &bo->mem);
-	}
+	ttm_bo_mem_put_locked(bo, &bo->mem);
 
 	atomic_set(&bo->reserved, 0);
 	wake_up_all(&bo->event_queue);
@@ -791,6 +789,15 @@ void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 }
 EXPORT_SYMBOL(ttm_bo_mem_put);
 
+void ttm_bo_mem_put_locked(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
+{
+	struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
+
+	if (mem->mm_node)
+		(*man->func->put_node_locked)(man, mem);
+}
+EXPORT_SYMBOL(ttm_bo_mem_put_locked);
+
 /**
  * Repeatedly evict memory from the LRU for @mem_type until we create enough
  * space, or we've evicted everything and there isn't enough space.

drivers/gpu/drm/ttm/ttm_bo_manager.c

@@ -90,6 +90,15 @@ static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
 	}
 }
 
+static void ttm_bo_man_put_node_locked(struct ttm_mem_type_manager *man,
+				       struct ttm_mem_reg *mem)
+{
+	if (mem->mm_node) {
+		drm_mm_put_block(mem->mm_node);
+		mem->mm_node = NULL;
+	}
+}
+
 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 			   unsigned long p_size)
 {
@@ -143,6 +152,7 @@ const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 	ttm_bo_man_takedown,
 	ttm_bo_man_get_node,
 	ttm_bo_man_put_node,
+	ttm_bo_man_put_node_locked,
 	ttm_bo_man_debug
 };
 EXPORT_SYMBOL(ttm_bo_manager_func);

include/drm/ttm/ttm_bo_driver.h

@@ -214,6 +214,8 @@ struct ttm_mem_type_manager_func {
 			 struct ttm_mem_reg *mem);
 	void (*put_node)(struct ttm_mem_type_manager *man,
 			 struct ttm_mem_reg *mem);
+	void (*put_node_locked)(struct ttm_mem_type_manager *man,
+				struct ttm_mem_reg *mem);
 	void (*debug)(struct ttm_mem_type_manager *man, const char *prefix);
 };
 
@@ -667,6 +669,8 @@ extern int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 
 extern void ttm_bo_mem_put(struct ttm_buffer_object *bo,
 			   struct ttm_mem_reg *mem);
+extern void ttm_bo_mem_put_locked(struct ttm_buffer_object *bo,
+				  struct ttm_mem_reg *mem);
 
 /**
  * ttm_bo_wait_for_cpu