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-rw-r--r--linux-core/drm_bo.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/linux-core/drm_bo.c b/linux-core/drm_bo.c
index 74476d35..7439e27d 100644
--- a/linux-core/drm_bo.c
+++ b/linux-core/drm_bo.c
@@ -1346,6 +1346,49 @@ static int drm_bo_add_ttm(drm_file_t * priv, drm_buffer_object_t * bo)
return ret;
}
+/*
+ * Transfer a buffer object's memory and LRU status to a newly
+ * created object. User-space references remains with the old
+ * object. Call bo->mutex locked.
+ */
+
+int drm_buffer_object_transfer(drm_buffer_object_t *bo,
+ drm_buffer_object_t **new_obj)
+{
+ drm_buffer_object_t *fbo;
+ drm_device_t *dev = bo->dev;
+ drm_buffer_manager_t *bm = &dev->bm;
+
+ fbo = drm_ctl_calloc(1, sizeof(*bo), DRM_MEM_BUFOBJ);
+ if (!fbo)
+ return -ENOMEM;
+
+ *fbo = *bo;
+ mutex_init(&fbo->mutex);
+ mutex_lock(&fbo->mutex);
+ mutex_lock(&dev->struct_mutex);
+
+ INIT_LIST_HEAD(&fbo->ddestroy);
+ INIT_LIST_HEAD(&fbo->lru);
+ list_splice_init(&bo->lru, &fbo->lru);
+
+ bo->mm_node = NULL;
+ bo->ttm = NULL;
+ bo->ttm_object = NULL;
+ bo->fence = NULL;
+ bo->flags = 0;
+
+ fbo->mm_node->private = (void *)fbo;
+ atomic_set(&fbo->usage, 1);
+ atomic_inc(&bm->count);
+ mutex_unlock(&dev->struct_mutex);
+ mutex_unlock(&fbo->mutex);
+
+ *new_obj = fbo;
+ return 0;
+}
+
+
int drm_buffer_object_create(drm_file_t * priv,
unsigned long size,
drm_bo_type_t type,