1 /*
2  * include/linux/sync_file.h
3  *
4  * Copyright (C) 2012 Google, Inc.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  */
12 
13 #ifndef _LINUX_SYNC_FILE_H
14 #define _LINUX_SYNC_FILE_H
15 
16 #include <linux/types.h>
17 #include <linux/ktime.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20 #include <linux/dma-fence.h>
21 #include <linux/dma-fence-array.h>
22 
23 /**
24  * struct sync_file - sync file to export to the userspace
25  * @file:		file representing this fence
26  * @sync_file_list:	membership in global file list
27  * @wq:			wait queue for fence signaling
28  * @flags:		flags for the sync_file
29  * @fence:		fence with the fences in the sync_file
30  * @cb:			fence callback information
31  *
32  * flags:
33  * POLL_ENABLED: whether userspace is currently poll()'ing or not
34  */
35 struct sync_file {
36 	struct file		*file;
37 	/**
38 	 * @user_name:
39 	 *
40 	 * Name of the sync file provided by userspace, for merged fences.
41 	 * Otherwise generated through driver callbacks (in which case the
42 	 * entire array is 0).
43 	 */
44 	char			user_name[32];
45 #ifdef CONFIG_DEBUG_FS
46 	struct list_head	sync_file_list;
47 #endif
48 
49 	wait_queue_head_t	wq;
50 	unsigned long		flags;
51 
52 	struct dma_fence	*fence;
53 	struct dma_fence_cb cb;
54 };
55 
56 #define POLL_ENABLED 0
57 
58 struct sync_file *sync_file_create(struct dma_fence *fence);
59 struct dma_fence *sync_file_get_fence(int fd);
60 char *sync_file_get_name(struct sync_file *sync_file, char *buf, int len);
61 
62 #endif /* _LINUX_SYNC_H */
63