1 /* 2 * sync / sw_sync abstraction 3 * Copyright 2015-2016 Collabora Ltd. 4 * 5 * Based on the implementation from the Android Open Source Project, 6 * 7 * Copyright 2012 Google, Inc 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 25 * OTHER DEALINGS IN THE SOFTWARE. 26 */ 27 28 #include <fcntl.h> 29 #include <malloc.h> 30 #include <poll.h> 31 #include <stdint.h> 32 #include <string.h> 33 #include <unistd.h> 34 35 #include <sys/ioctl.h> 36 #include <sys/stat.h> 37 #include <sys/types.h> 38 39 #include "sync.h" 40 #include "sw_sync.h" 41 42 #include <linux/sync_file.h> 43 44 45 /* SW_SYNC ioctls */ 46 struct sw_sync_create_fence_data { 47 __u32 value; 48 char name[32]; 49 __s32 fence; 50 }; 51 52 #define SW_SYNC_IOC_MAGIC 'W' 53 #define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\ 54 struct sw_sync_create_fence_data) 55 #define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32) 56 57 58 int sync_wait(int fd, int timeout) 59 { 60 struct pollfd fds; 61 62 fds.fd = fd; 63 fds.events = POLLIN | POLLERR; 64 65 return poll(&fds, 1, timeout); 66 } 67 68 int sync_merge(const char *name, int fd1, int fd2) 69 { 70 struct sync_merge_data data = {}; 71 int err; 72 73 data.fd2 = fd2; 74 strncpy(data.name, name, sizeof(data.name) - 1); 75 data.name[sizeof(data.name) - 1] = '\0'; 76 77 err = ioctl(fd1, SYNC_IOC_MERGE, &data); 78 if (err < 0) 79 return err; 80 81 return data.fence; 82 } 83 84 static struct sync_file_info *sync_file_info(int fd) 85 { 86 struct sync_file_info *info; 87 struct sync_fence_info *fence_info; 88 int err, num_fences; 89 90 info = calloc(1, sizeof(*info)); 91 if (info == NULL) 92 return NULL; 93 94 err = ioctl(fd, SYNC_IOC_FILE_INFO, info); 95 if (err < 0) { 96 free(info); 97 return NULL; 98 } 99 100 num_fences = info->num_fences; 101 102 if (num_fences) { 103 info->flags = 0; 104 info->num_fences = num_fences; 105 106 fence_info = calloc(num_fences, sizeof(*fence_info)); 107 if (!fence_info) { 108 free(info); 109 return NULL; 110 } 111 112 info->sync_fence_info = (uint64_t)fence_info; 113 114 err = ioctl(fd, SYNC_IOC_FILE_INFO, info); 115 if (err < 0) { 116 free(fence_info); 117 free(info); 118 return NULL; 119 } 120 } 121 122 return info; 123 } 124 125 static void sync_file_info_free(struct sync_file_info *info) 126 { 127 free((void *)info->sync_fence_info); 128 free(info); 129 } 130 131 int sync_fence_size(int fd) 132 { 133 int count; 134 struct sync_file_info *info = sync_file_info(fd); 135 136 if (!info) 137 return 0; 138 139 count = info->num_fences; 140 141 sync_file_info_free(info); 142 143 return count; 144 } 145 146 int sync_fence_count_with_status(int fd, int status) 147 { 148 unsigned int i, count = 0; 149 struct sync_fence_info *fence_info = NULL; 150 struct sync_file_info *info = sync_file_info(fd); 151 152 if (!info) 153 return -1; 154 155 fence_info = (struct sync_fence_info *)info->sync_fence_info; 156 for (i = 0 ; i < info->num_fences ; i++) { 157 if (fence_info[i].status == status) 158 count++; 159 } 160 161 sync_file_info_free(info); 162 163 return count; 164 } 165 166 int sw_sync_timeline_create(void) 167 { 168 return open("/sys/kernel/debug/sync/sw_sync", O_RDWR); 169 } 170 171 int sw_sync_timeline_inc(int fd, unsigned int count) 172 { 173 __u32 arg = count; 174 175 return ioctl(fd, SW_SYNC_IOC_INC, &arg); 176 } 177 178 int sw_sync_timeline_is_valid(int fd) 179 { 180 int status; 181 182 if (fd == -1) 183 return 0; 184 185 status = fcntl(fd, F_GETFD, 0); 186 return (status >= 0); 187 } 188 189 void sw_sync_timeline_destroy(int fd) 190 { 191 if (sw_sync_timeline_is_valid(fd)) 192 close(fd); 193 } 194 195 int sw_sync_fence_create(int fd, const char *name, unsigned int value) 196 { 197 struct sw_sync_create_fence_data data = {}; 198 int err; 199 200 data.value = value; 201 strncpy(data.name, name, sizeof(data.name) - 1); 202 data.name[sizeof(data.name) - 1] = '\0'; 203 204 err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data); 205 if (err < 0) 206 return err; 207 208 return data.fence; 209 } 210 211 int sw_sync_fence_is_valid(int fd) 212 { 213 /* Same code! */ 214 return sw_sync_timeline_is_valid(fd); 215 } 216 217 void sw_sync_fence_destroy(int fd) 218 { 219 if (sw_sync_fence_is_valid(fd)) 220 close(fd); 221 } 222