include/uapi/linux/sync_file.h

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