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 <linux/sync.h> 25 #include <linux/sw_sync.h> 26 27 #include <sys/ioctl.h> 28 #include <sys/stat.h> 29 #include <sys/types.h> 30 31 int sync_wait(int fd, int timeout) 32 { 33 __s32 to = timeout; 34 35 return ioctl(fd, SYNC_IOC_WAIT, &to); 36 } 37 38 int sync_merge(const char *name, int fd1, int fd2) 39 { 40 struct sync_merge_data data; 41 int err; 42 43 data.fd2 = fd2; 44 strlcpy(data.name, name, sizeof(data.name)); 45 46 err = ioctl(fd1, SYNC_IOC_MERGE, &data); 47 if (err < 0) 48 return err; 49 50 return data.fence; 51 } 52 53 struct sync_fence_info_data *sync_fence_info(int fd) 54 { 55 struct sync_fence_info_data *info; 56 int err; 57 58 info = malloc(4096); 59 if (info == NULL) 60 return NULL; 61 62 info->len = 4096; 63 err = ioctl(fd, SYNC_IOC_FENCE_INFO, info); 64 if (err < 0) { 65 free(info); 66 return NULL; 67 } 68 69 return info; 70 } 71 72 struct sync_pt_info *sync_pt_info(struct sync_fence_info_data *info, 73 struct sync_pt_info *itr) 74 { 75 if (itr == NULL) 76 itr = (struct sync_pt_info *) info->pt_info; 77 else 78 itr = (struct sync_pt_info *) ((__u8 *)itr + itr->len); 79 80 if ((__u8 *)itr - (__u8 *)info >= (int)info->len) 81 return NULL; 82 83 return itr; 84 } 85 86 void sync_fence_info_free(struct sync_fence_info_data *info) 87 { 88 free(info); 89 } 90 91 92 int sw_sync_timeline_create(void) 93 { 94 return open("/dev/sw_sync", O_RDWR); 95 } 96 97 int sw_sync_timeline_inc(int fd, unsigned count) 98 { 99 __u32 arg = count; 100 101 return ioctl(fd, SW_SYNC_IOC_INC, &arg); 102 } 103 104 int sw_sync_fence_create(int fd, const char *name, unsigned value) 105 { 106 struct sw_sync_create_fence_data data; 107 int err; 108 109 data.value = value; 110 strlcpy(data.name, name, sizeof(data.name)); 111 112 err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data); 113 if (err < 0) 114 return err; 115 116 return data.fence; 117 } 118
