sync.c revision ffc687baad033ecc96f6c560b205fea61afe9e41 
1/*
2 *  sync.c
3 *
4 *   Copyright 2012 Google, Inc
5 *
6 *  Licensed under the Apache License, Version 2.0 (the "License");
7 *  you may not use this file except in compliance with the License.
8 *  You may obtain a copy of the License at
9 *
10 *      http://www.apache.org/licenses/LICENSE-2.0
11 *
12 *  Unless required by applicable law or agreed to in writing, software
13 *  distributed under the License is distributed on an "AS IS" BASIS,
14 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 *  See the License for the specific language governing permissions and
16 *  limitations under the License.
17 */
18
19#include <fcntl.h>
20#include <malloc.h>
21#include <stdint.h>
22#include <string.h>
23
24#include <sys/ioctl.h>
25#include <sys/stat.h>
26#include <sys/types.h>
27
28#include <sync/sync.h>
29
30
31struct sw_sync_create_fence_data {
32  __u32 value;
33  char name[32];
34  __s32 fence;
35};
36
37#define SW_SYNC_IOC_MAGIC 'W'
38#define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0, struct sw_sync_create_fence_data)
39#define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
40
41int sync_wait(int fd, int timeout)
42{
43    __s32 to = timeout;
44
45    return ioctl(fd, SYNC_IOC_LEGACY_WAIT, &to);
46}
47
48int sync_merge(const char *name, int fd1, int fd2)
49{
50    struct sync_legacy_merge_data data;
51    int err;
52
53    data.fd2 = fd2;
54    strlcpy(data.name, name, sizeof(data.name));
55
56    err = ioctl(fd1, SYNC_IOC_LEGACY_MERGE, &data);
57    if (err < 0)
58        return err;
59
60    return data.fence;
61}
62
63struct sync_fence_info_data *sync_fence_info(int fd)
64{
65    struct sync_fence_info_data *info;
66    int err;
67
68    info = malloc(4096);
69    if (info == NULL)
70        return NULL;
71
72    info->len = 4096;
73    err = ioctl(fd, SYNC_IOC_LEGACY_FENCE_INFO, info);
74    if (err < 0) {
75        free(info);
76        return NULL;
77    }
78
79    return info;
80}
81
82struct sync_pt_info *sync_pt_info(struct sync_fence_info_data *info,
83                                  struct sync_pt_info *itr)
84{
85    if (itr == NULL)
86        itr = (struct sync_pt_info *) info->pt_info;
87    else
88        itr = (struct sync_pt_info *) ((__u8 *)itr + itr->len);
89
90    if ((__u8 *)itr - (__u8 *)info >= (int)info->len)
91        return NULL;
92
93    return itr;
94}
95
96void sync_fence_info_free(struct sync_fence_info_data *info)
97{
98    free(info);
99}
100
101
102int sw_sync_timeline_create(void)
103{
104    int ret;
105
106    ret = open("/sys/kernel/debug/sync/sw_sync", O_RDWR);
107    if (ret < 0)
108        ret = open("/dev/sw_sync", O_RDWR);
109
110    return ret;
111}
112
113int sw_sync_timeline_inc(int fd, unsigned count)
114{
115    __u32 arg = count;
116
117    return ioctl(fd, SW_SYNC_IOC_INC, &arg);
118}
119
120int sw_sync_fence_create(int fd, const char *name, unsigned value)
121{
122    struct sw_sync_create_fence_data data;
123    int err;
124
125    data.value = value;
126    strlcpy(data.name, name, sizeof(data.name));
127
128    err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);
129    if (err < 0)
130        return err;
131
132    return data.fence;
133}
134