1 /*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "fence.h"
17
18 #include <cerrno>
19 #include <fcntl.h>
20 #include <poll.h>
21 #include <sys/ioctl.h>
22 #include <sys/stat.h>
23 #include <sys/types.h>
24 #include <unistd.h>
25
26 #include <hilog/log.h>
27 #include <securec.h>
28 #include <linux/sync_file.h>
29
IsSupportSwSync()30 bool IsSupportSwSync()
31 {
32 struct stat syncStatus = {};
33 if (!stat("/sys/kernel/debug/sync/sw_sync", &syncStatus)) {
34 return true;
35 }
36 return false;
37 }
38
CreateTimeline()39 int CreateTimeline()
40 {
41 int timeline = open("/sys/kernel/debug/sync/sw_sync", O_RDWR);
42 if (timeline < 0) {
43 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "open file failed");
44 return -1;
45 }
46
47 if (fcntl(timeline, F_GETFD, 0) < 0) {
48 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "the timeline is valid");
49 close(timeline);
50 return -1;
51 }
52 return timeline;
53 }
54
CreateFenceFromTimeline(int timeline,const char * name,unsigned int totalSteps)55 int CreateFenceFromTimeline(int timeline, const char* name, unsigned int totalSteps)
56 {
57 struct sw_sync_create_fence_data {
58 unsigned int value;
59 char name[32];
60 unsigned int fence;
61 };
62
63 struct sw_sync_create_fence_data data = {
64 .value = totalSteps
65 };
66
67 if (strcpy_s(data.name, sizeof(data.name), name)) {
68 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "Create Fence From Timeline Failed");
69 return -1;
70 }
71 int ret = ioctl(timeline, _IOWR('W', 0, struct sw_sync_create_fence_data), &data);
72 if (ret != 0) {
73 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", " data.fence are invalid");
74 return -1;
75 }
76 return data.fence;
77 }
78
FenceHold(int fd,int timeout)79 int FenceHold(int fd, int timeout)
80 {
81 int ret = 0;
82 if (fd < 0) {
83 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "the fd is invalid");
84 return -1;
85 }
86
87 struct pollfd pollfds = {
88 .fd = fd,
89 .events = POLLIN | POLLERR,
90 };
91
92 do {
93 ret = poll(&pollfds, 1, timeout);
94 } while (ret == -1 && errno == EINTR);
95 return ret;
96 }
97
TimelineActivate(int timeline,unsigned int step)98 int TimelineActivate(int timeline, unsigned int step)
99 {
100 int ret = ioctl(timeline, _IOW('W', 1, unsigned int), &step);
101 if (ret != 0) {
102 return errno;
103 }
104 return ret;
105 }
106
FenceGetStatus(int fd)107 enum FenceStatus FenceGetStatus(int fd)
108 {
109 int ret = FenceHold(fd, 0);
110
111 enum FenceStatus status = ACTIVE;
112 if (ret < 0) {
113 status = ERROR;
114 } else if (ret > 0) {
115 status = SIGNALED;
116 }
117 return status;
118 }
119
FenceMerge(const char * name,int fd1,int fd2)120 int FenceMerge(const char* name, int fd1, int fd2)
121 {
122 int result_code;
123 struct sync_merge_data sync_merge_data = {};
124 if (strcpy_s(sync_merge_data.name, sizeof(sync_merge_data.name), name)) {
125 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "FenceMerge strcpy name failed");
126 return -1;
127 }
128
129 if (fd1 >= 0 && fd2 < 0) {
130 sync_merge_data.fd2 = fd1;
131 result_code = ioctl(fd1, SYNC_IOC_MERGE, &sync_merge_data);
132 }
133
134 if (fd1 < 0 && fd2 >= 0) {
135 sync_merge_data.fd2 = fd2;
136 result_code = ioctl(fd2, SYNC_IOC_MERGE, &sync_merge_data);
137 }
138
139 if (fd1 >= 0 && fd2 >= 0) {
140 sync_merge_data.fd2 = fd2;
141 result_code = ioctl(fd1, SYNC_IOC_MERGE, &sync_merge_data);
142 }
143
144 if (fd1 < 0 && fd2 < 0) {
145 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "fd1 and fd2 are invalid");
146 return -1;
147 }
148
149 if (result_code < 0) {
150 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "merge failed %{public}d", errno);
151 return result_code;
152 }
153 return sync_merge_data.fence;
154 }
155
156