v4.19.13 snapshot.
diff --git a/include/linux/sync_file.h b/include/linux/sync_file.h
new file mode 100644
index 0000000..790ca02
--- /dev/null
+++ b/include/linux/sync_file.h
@@ -0,0 +1,62 @@
+/*
+ * include/linux/sync_file.h
+ *
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _LINUX_SYNC_FILE_H
+#define _LINUX_SYNC_FILE_H
+
+#include <linux/types.h>
+#include <linux/ktime.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/dma-fence.h>
+#include <linux/dma-fence-array.h>
+
+/**
+ * struct sync_file - sync file to export to the userspace
+ * @file: file representing this fence
+ * @sync_file_list: membership in global file list
+ * @wq: wait queue for fence signaling
+ * @flags: flags for the sync_file
+ * @fence: fence with the fences in the sync_file
+ * @cb: fence callback information
+ *
+ * flags:
+ * POLL_ENABLED: whether userspace is currently poll()'ing or not
+ */
+struct sync_file {
+ struct file *file;
+ /**
+ * @user_name:
+ *
+ * Name of the sync file provided by userspace, for merged fences.
+ * Otherwise generated through driver callbacks (in which case the
+ * entire array is 0).
+ */
+ char user_name[32];
+#ifdef CONFIG_DEBUG_FS
+ struct list_head sync_file_list;
+#endif
+
+ wait_queue_head_t wq;
+ unsigned long flags;
+
+ struct dma_fence *fence;
+ struct dma_fence_cb cb;
+};
+
+#define POLL_ENABLED 0
+
+struct sync_file *sync_file_create(struct dma_fence *fence);
+struct dma_fence *sync_file_get_fence(int fd);
+char *sync_file_get_name(struct sync_file *sync_file, char *buf, int len);
+
+#endif /* _LINUX_SYNC_H */