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 <stdint.h> 21 #include <string.h> 22 23 #include <linux/sync.h> 24 #include <linux/sw_sync.h> 25 26 #include <sys/ioctl.h> 27 #include <sys/stat.h> 28 #include <sys/types.h> 29 30 int sync_wait(int fd, int timeout) 31 { 32 __s32 to = timeout; 33 34 return ioctl(fd, SYNC_IOC_WAIT, &to); 35 } 36 37 int sync_merge(const char *name, int fd1, int fd2) 38 { 39 struct sync_merge_data data; 40 int err; 41 42 data.fd2 = fd2; 43 strlcpy(data.name, name, sizeof(data.name)); 44 45 err = ioctl(fd1, SYNC_IOC_MERGE, &data); 46 if (err < 0) 47 return err; 48 49 return data.fence; 50 } 51 52 struct sync_fence_info_data *sync_fence_info(int fd) 53 { 54 struct sync_fence_info_data *info; 55 int err; 56 57 info = malloc(4096); 58 if (info == NULL) 59 return NULL; 60 61 info->len = 4096; 62 err = ioctl(fd, SYNC_IOC_FENCE_INFO, info); 63 if (err < 0) { 64 free(info); 65 return NULL; 66 } 67 68 return info; 69 } 70 71 struct sync_pt_info *sync_pt_info(struct sync_fence_info_data *info, 72 struct sync_pt_info *itr) 73 { 74 if (itr == NULL) 75 itr = (struct sync_pt_info *) info->pt_info; 76 else 77 itr = (struct sync_pt_info *) ((__u8 *)itr + itr->len); 78 79 if ((__u8 *)itr - (__u8 *)info >= (int)info->len) 80 return NULL; 81 82 return itr; 83 } 84 85 void sync_fence_info_free(struct sync_fence_info_data *info) 86 { 87 free(info); 88 } 89 90 91 int sw_sync_timeline_create(void) 92 { 93 return open("/dev/sw_sync", O_RDWR); 94 } 95 96 int sw_sync_timeline_inc(int fd, unsigned count) 97 { 98 __u32 arg = count; 99 100 return ioctl(fd, SW_SYNC_IOC_INC, &arg); 101 } 102 103 int sw_sync_fence_create(int fd, const char *name, unsigned value) 104 { 105 struct sw_sync_create_fence_data data; 106 int err; 107 108 data.value = value; 109 strlcpy(data.name, name, sizeof(data.name)); 110 111 err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data); 112 if (err < 0) 113 return err; 114 115 return data.fence; 116 } 117
