include/uapi/linux/sync_file.h

   1 /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
   2 /*
   3  * Copyright (C) 2012 Google, Inc.
   4  *
   5  * This program is distributed in the hope that it will be useful,
   6  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   7  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   8  * GNU General Public License for more details.
   9  *
  10  */
  11
  12 #ifndef _UAPI_LINUX_SYNC_H
  13 #define _UAPI_LINUX_SYNC_H
  14
  15 #include <linux/ioctl.h>
  16 #include <linux/types.h>
  17
  18 /**
  19  * struct sync_merge_data - data passed to merge ioctl
  20  * @name:       name of new fence
  21  * @fd2:        file descriptor of second fence
  22  * @fence:      returns the fd of the new fence to userspace
  23  * @flags:      merge_data flags
  24  * @pad:        padding for 64-bit alignment, should always be zero
  25  */
  26 struct sync_merge_data {
  27         char    name[32];
  28         __s32   fd2;
  29         __s32   fence;
  30         __u32   flags;
  31         __u32   pad;
  32 };
  33
  34 /**
  35  * struct sync_fence_info - detailed fence information
  36  * @obj_name:           name of parent sync_timeline
  37 * @driver_name: name of driver implementing the parent
  38 * @status:              status of the fence 0:active 1:signaled <0:error
  39  * @flags:              fence_info flags
  40  * @timestamp_ns:       timestamp of status change in nanoseconds
  41  */
  42 struct sync_fence_info {
  43         char    obj_name[32];
  44         char    driver_name[32];
  45         __s32   status;
  46         __u32   flags;
  47         __u64   timestamp_ns;
  48 };
  49
  50 /**
  51  * struct sync_file_info - data returned from fence info ioctl
  52  * @name:       name of fence
  53  * @status:     status of fence. 1: signaled 0:active <0:error
  54  * @flags:      sync_file_info flags
  55  * @num_fences  number of fences in the sync_file
  56  * @pad:        padding for 64-bit alignment, should always be zero
  57  * @sync_fence_info: pointer to array of structs sync_fence_info with all
  58  *               fences in the sync_file
  59  */
  60 struct sync_file_info {
  61         char    name[32];
  62         __s32   status;
  63         __u32   flags;
  64         __u32   num_fences;
  65         __u32   pad;
  66
  67         __u64   sync_fence_info;
  68 };
  69
  70 #define SYNC_IOC_MAGIC          '>'
  71
  72 /**
  73  * Opcodes  0, 1 and 2 were burned during a API change to avoid users of the
  74  * old API to get weird errors when trying to handling sync_files. The API
  75  * change happened during the de-stage of the Sync Framework when there was
  76  * no upstream users available.
  77  */
  78
  79 /**
  80  * DOC: SYNC_IOC_MERGE - merge two fences
  81  *
  82  * Takes a struct sync_merge_data.  Creates a new fence containing copies of
  83  * the sync_pts in both the calling fd and sync_merge_data.fd2.  Returns the
  84  * new fence's fd in sync_merge_data.fence
  85  */
  86 #define SYNC_IOC_MERGE          _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
  87
  88 /**
  89  * DOC: SYNC_IOC_FILE_INFO - get detailed information on a sync_file
  90  *
  91  * Takes a struct sync_file_info. If num_fences is 0, the field is updated
  92  * with the actual number of fences. If num_fences is > 0, the system will
  93  * use the pointer provided on sync_fence_info to return up to num_fences of
  94  * struct sync_fence_info, with detailed fence information.
  95  */
  96 #define SYNC_IOC_FILE_INFO      _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)
  97
  98 #endif /* _UAPI_LINUX_SYNC_H */