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 (fcntl(timeline, F_GETFD, 0) < 0) {
43 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "the timeline is valid");
44 return -1;
45 }
46 return timeline;
47 }
48
CreateFenceFromTimeline(int timeline,const char * name,unsigned int totalSteps)49 int CreateFenceFromTimeline(int timeline, const char* name, unsigned int totalSteps)
50 {
51 struct sw_sync_create_fence_data {
52 unsigned int value;
53 char name[32];
54 unsigned int fence;
55 };
56
57 struct sw_sync_create_fence_data data = {
58 .value = totalSteps
59 };
60
61 if (strcpy_s(data.name, sizeof(data.name), name)) {
62 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "Create Fence From Timeline Failed");
63 return -1;
64 }
65 int ret = ioctl(timeline, _IOWR('W', 0, struct sw_sync_create_fence_data), &data);
66 if (ret != 0) {
67 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", " data.fence are invalid");
68 return -1;
69 }
70 return data.fence;
71 }
72
FenceHold(int fd,int timeout)73 int FenceHold(int fd, int timeout)
74 {
75 int ret = 0;
76 if (fd < 0) {
77 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "the fd is invalid");
78 return -1;
79 }
80
81 struct pollfd pollfds = {
82 .fd = fd,
83 .events = POLLIN | POLLERR,
84 };
85
86 do {
87 ret = poll(&pollfds, 1, timeout);
88 } while (ret == -1 && errno == EINTR);
89 return ret;
90 }
91
TimelineActivate(int timeline,unsigned int step)92 int TimelineActivate(int timeline, unsigned int step)
93 {
94 int ret = ioctl(timeline, _IOW('W', 1, unsigned int), &step);
95 if (ret != 0) {
96 return errno;
97 }
98 return ret;
99 }
100
FenceGetStatus(int fd)101 enum FenceStatus FenceGetStatus(int fd)
102 {
103 int ret = FenceHold(fd, 0);
104
105 enum FenceStatus status = ACTIVE;
106 if (ret < 0) {
107 status = ERROR;
108 } else if (ret > 0) {
109 status = SIGNALED;
110 }
111 return status;
112 }
113
FenceMerge(const char * name,int fd1,int fd2)114 int FenceMerge(const char* name, int fd1, int fd2)
115 {
116 int result_code;
117 struct sync_merge_data sync_merge_data = {};
118 if (strcpy_s(sync_merge_data.name, sizeof(sync_merge_data.name), name)) {
119 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "FenceMerge strcpy name failed");
120 return -1;
121 }
122
123 if (fd1 >= 0 && fd2 < 0) {
124 sync_merge_data.fd2 = fd1;
125 result_code = ioctl(fd1, SYNC_IOC_MERGE, &sync_merge_data);
126 }
127
128 if (fd1 < 0 && fd2 >= 0) {
129 sync_merge_data.fd2 = fd2;
130 result_code = ioctl(fd2, SYNC_IOC_MERGE, &sync_merge_data);
131 }
132
133 if (fd1 >= 0 && fd2 >= 0) {
134 sync_merge_data.fd2 = fd2;
135 result_code = ioctl(fd1, SYNC_IOC_MERGE, &sync_merge_data);
136 }
137
138 if (fd1 < 0 && fd2 < 0) {
139 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "fd1 and fd2 are invalid");
140 return -1;
141 }
142
143 if (result_code < 0) {
144 HiLogPrint(LOG_CORE, LOG_ERROR, 0, "fence", "merge failed %{public}d", errno);
145 return result_code;
146 }
147 return sync_merge_data.fence;
148 }
149
150