1 /*
2 * Copyright (c) 2022 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 #ifndef UTILS_INCLUDE_SW_SYNC_H
17 #define UTILS_INCLUDE_SW_SYNC_H
18
19 #include <cerrno>
20 #include <fcntl.h>
21 #include <poll.h>
22 #include <sys/ioctl.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <unistd.h>
26
27 #include <securec.h>
28
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32
33 struct sw_sync_create_fence_data {
34 unsigned int value;
35 char name[32];
36 unsigned int fence;
37 };
38
39 #define SYNC_IOC_CREATE_SW_SYNC_FENCE _IOWR('W', 0, struct sw_sync_create_fence_data)
40 #define SYNC_IOC_INCREASE_TIMELINE _IOW('W', 1, unsigned int)
41
IsSupportSoftwareSync(void)42 static inline bool IsSupportSoftwareSync(void)
43 {
44 struct stat syncStatus = {};
45 if (!stat("/sys/kernel/debug/sync/sw_sync", &syncStatus)) {
46 return true;
47 }
48 return false;
49 }
50
CreateSyncTimeline(void)51 static inline int CreateSyncTimeline(void)
52 {
53 int timeline = open("/sys/kernel/debug/sync/sw_sync", O_RDWR);
54 if (fcntl(timeline, F_GETFD, 0) < 0) {
55 return -1;
56 }
57 return timeline;
58 }
59
IncreaseSyncPointOnTimeline(int timelineFd,unsigned int count)60 static inline int IncreaseSyncPointOnTimeline(int timelineFd, unsigned int count)
61 {
62 unsigned int count_ = count;
63
64 int ret = ioctl(timelineFd, SYNC_IOC_INCREASE_TIMELINE, &count_);
65 return ret;
66 }
67
CreateSyncFence(int timelineFd,const char * name,unsigned int totalSteps)68 static inline int CreateSyncFence(int timelineFd, const char* name, unsigned int totalSteps)
69 {
70 struct sw_sync_create_fence_data data = { .value = totalSteps };
71 if (strcpy_s(data.name, sizeof(data.name), name)) {
72 return -1;
73 }
74 int ret = ioctl(timelineFd, SYNC_IOC_CREATE_SW_SYNC_FENCE, &data);
75 return ret != 0 ? ret : data.fence;
76 }
77
78 #ifdef __cplusplus
79 }
80 #endif
81
82 #endif