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path: root/drivers/gpu/drm/drm_gem.c
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Diffstat (limited to 'drivers/gpu/drm/drm_gem.c')
-rw-r--r--drivers/gpu/drm/drm_gem.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 5df028a6dd9f..a8d396bed6a4 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -311,6 +311,41 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
EXPORT_SYMBOL(drm_gem_handle_delete);
/**
+ * drm_gem_dumb_map_offset - return the fake mmap offset for a gem object
+ * @file: drm file-private structure containing the gem object
+ * @dev: corresponding drm_device
+ * @handle: gem object handle
+ * @offset: return location for the fake mmap offset
+ *
+ * This implements the &drm_driver.dumb_map_offset kms driver callback for
+ * drivers which use gem to manage their backing storage.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
+ u32 handle, u64 *offset)
+{
+ struct drm_gem_object *obj;
+ int ret;
+
+ obj = drm_gem_object_lookup(file, handle);
+ if (!obj)
+ return -ENOENT;
+
+ ret = drm_gem_create_mmap_offset(obj);
+ if (ret)
+ goto out;
+
+ *offset = drm_vma_node_offset_addr(&obj->vma_node);
+out:
+ drm_gem_object_put_unlocked(obj);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(drm_gem_dumb_map_offset);
+
+/**
* drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
* @file: drm file-private structure to remove the dumb handle from
* @dev: corresponding drm_device