1 /* 2 * builtin-buildid-cache.c 3 * 4 * Builtin buildid-cache command: Manages build-id cache 5 * 6 * Copyright (C) 2010, Red Hat Inc. 7 * Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com> 8 */ 9 #include <sys/types.h> 10 #include <sys/time.h> 11 #include <time.h> 12 #include <dirent.h> 13 #include <unistd.h> 14 #include "builtin.h" 15 #include "perf.h" 16 #include "util/cache.h" 17 #include "util/debug.h" 18 #include "util/header.h" 19 #include "util/parse-options.h" 20 #include "util/strlist.h" 21 #include "util/build-id.h" 22 #include "util/session.h" 23 #include "util/symbol.h" 24 25 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid) 26 { 27 char root_dir[PATH_MAX]; 28 char *p; 29 30 strlcpy(root_dir, proc_dir, sizeof(root_dir)); 31 32 p = strrchr(root_dir, '/'); 33 if (!p) 34 return -1; 35 *p = '\0'; 36 return sysfs__sprintf_build_id(root_dir, sbuildid); 37 } 38 39 static int build_id_cache__kcore_dir(char *dir, size_t sz) 40 { 41 struct timeval tv; 42 struct tm tm; 43 char dt[32]; 44 45 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm)) 46 return -1; 47 48 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm)) 49 return -1; 50 51 scnprintf(dir, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000); 52 53 return 0; 54 } 55 56 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir) 57 { 58 char from[PATH_MAX]; 59 char to[PATH_MAX]; 60 const char *name; 61 u64 addr1 = 0, addr2 = 0; 62 int i; 63 64 scnprintf(from, sizeof(from), "%s/kallsyms", from_dir); 65 scnprintf(to, sizeof(to), "%s/kallsyms", to_dir); 66 67 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) { 68 addr1 = kallsyms__get_function_start(from, name); 69 if (addr1) 70 break; 71 } 72 73 if (name) 74 addr2 = kallsyms__get_function_start(to, name); 75 76 return addr1 == addr2; 77 } 78 79 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir, 80 size_t to_dir_sz) 81 { 82 char from[PATH_MAX]; 83 char to[PATH_MAX]; 84 char to_subdir[PATH_MAX]; 85 struct dirent *dent; 86 int ret = -1; 87 DIR *d; 88 89 d = opendir(to_dir); 90 if (!d) 91 return -1; 92 93 scnprintf(from, sizeof(from), "%s/modules", from_dir); 94 95 while (1) { 96 dent = readdir(d); 97 if (!dent) 98 break; 99 if (dent->d_type != DT_DIR) 100 continue; 101 scnprintf(to, sizeof(to), "%s/%s/modules", to_dir, 102 dent->d_name); 103 scnprintf(to_subdir, sizeof(to_subdir), "%s/%s", 104 to_dir, dent->d_name); 105 if (!compare_proc_modules(from, to) && 106 same_kallsyms_reloc(from_dir, to_subdir)) { 107 strlcpy(to_dir, to_subdir, to_dir_sz); 108 ret = 0; 109 break; 110 } 111 } 112 113 closedir(d); 114 115 return ret; 116 } 117 118 static int build_id_cache__add_kcore(const char *filename, bool force) 119 { 120 char dir[32], sbuildid[SBUILD_ID_SIZE]; 121 char from_dir[PATH_MAX], to_dir[PATH_MAX]; 122 char *p; 123 124 strlcpy(from_dir, filename, sizeof(from_dir)); 125 126 p = strrchr(from_dir, '/'); 127 if (!p || strcmp(p + 1, "kcore")) 128 return -1; 129 *p = '\0'; 130 131 if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0) 132 return -1; 133 134 scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s", 135 buildid_dir, sbuildid); 136 137 if (!force && 138 !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) { 139 pr_debug("same kcore found in %s\n", to_dir); 140 return 0; 141 } 142 143 if (build_id_cache__kcore_dir(dir, sizeof(dir))) 144 return -1; 145 146 scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s/%s", 147 buildid_dir, sbuildid, dir); 148 149 if (mkdir_p(to_dir, 0755)) 150 return -1; 151 152 if (kcore_copy(from_dir, to_dir)) { 153 /* Remove YYYYmmddHHMMSShh directory */ 154 if (!rmdir(to_dir)) { 155 p = strrchr(to_dir, '/'); 156 if (p) 157 *p = '\0'; 158 /* Try to remove buildid directory */ 159 if (!rmdir(to_dir)) { 160 p = strrchr(to_dir, '/'); 161 if (p) 162 *p = '\0'; 163 /* Try to remove [kernel.kcore] directory */ 164 rmdir(to_dir); 165 } 166 } 167 return -1; 168 } 169 170 pr_debug("kcore added to build-id cache directory %s\n", to_dir); 171 172 return 0; 173 } 174 175 static int build_id_cache__add_file(const char *filename) 176 { 177 char sbuild_id[SBUILD_ID_SIZE]; 178 u8 build_id[BUILD_ID_SIZE]; 179 int err; 180 181 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 182 pr_debug("Couldn't read a build-id in %s\n", filename); 183 return -1; 184 } 185 186 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 187 err = build_id_cache__add_s(sbuild_id, filename, 188 false, false); 189 pr_debug("Adding %s %s: %s\n", sbuild_id, filename, 190 err ? "FAIL" : "Ok"); 191 return err; 192 } 193 194 static int build_id_cache__remove_file(const char *filename) 195 { 196 u8 build_id[BUILD_ID_SIZE]; 197 char sbuild_id[SBUILD_ID_SIZE]; 198 199 int err; 200 201 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 202 pr_debug("Couldn't read a build-id in %s\n", filename); 203 return -1; 204 } 205 206 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 207 err = build_id_cache__remove_s(sbuild_id); 208 pr_debug("Removing %s %s: %s\n", sbuild_id, filename, 209 err ? "FAIL" : "Ok"); 210 211 return err; 212 } 213 214 static int build_id_cache__purge_path(const char *pathname) 215 { 216 struct strlist *list; 217 struct str_node *pos; 218 int err; 219 220 err = build_id_cache__list_build_ids(pathname, &list); 221 if (err) 222 goto out; 223 224 strlist__for_each(pos, list) { 225 err = build_id_cache__remove_s(pos->s); 226 pr_debug("Removing %s %s: %s\n", pos->s, pathname, 227 err ? "FAIL" : "Ok"); 228 if (err) 229 break; 230 } 231 strlist__delete(list); 232 233 out: 234 pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok"); 235 236 return err; 237 } 238 239 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused) 240 { 241 char filename[PATH_MAX]; 242 u8 build_id[BUILD_ID_SIZE]; 243 244 if (dso__build_id_filename(dso, filename, sizeof(filename)) && 245 filename__read_build_id(filename, build_id, 246 sizeof(build_id)) != sizeof(build_id)) { 247 if (errno == ENOENT) 248 return false; 249 250 pr_warning("Problems with %s file, consider removing it from the cache\n", 251 filename); 252 } else if (memcmp(dso->build_id, build_id, sizeof(dso->build_id))) { 253 pr_warning("Problems with %s file, consider removing it from the cache\n", 254 filename); 255 } 256 257 return true; 258 } 259 260 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp) 261 { 262 perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0); 263 return 0; 264 } 265 266 static int build_id_cache__update_file(const char *filename) 267 { 268 u8 build_id[BUILD_ID_SIZE]; 269 char sbuild_id[SBUILD_ID_SIZE]; 270 271 int err = 0; 272 273 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 274 pr_debug("Couldn't read a build-id in %s\n", filename); 275 return -1; 276 } 277 278 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 279 if (build_id_cache__cached(sbuild_id)) 280 err = build_id_cache__remove_s(sbuild_id); 281 282 if (!err) 283 err = build_id_cache__add_s(sbuild_id, filename, false, false); 284 285 pr_debug("Updating %s %s: %s\n", sbuild_id, filename, 286 err ? "FAIL" : "Ok"); 287 288 return err; 289 } 290 291 int cmd_buildid_cache(int argc, const char **argv, 292 const char *prefix __maybe_unused) 293 { 294 struct strlist *list; 295 struct str_node *pos; 296 int ret = 0; 297 bool force = false; 298 char const *add_name_list_str = NULL, 299 *remove_name_list_str = NULL, 300 *purge_name_list_str = NULL, 301 *missing_filename = NULL, 302 *update_name_list_str = NULL, 303 *kcore_filename = NULL; 304 char sbuf[STRERR_BUFSIZE]; 305 306 struct perf_data_file file = { 307 .mode = PERF_DATA_MODE_READ, 308 }; 309 struct perf_session *session = NULL; 310 311 const struct option buildid_cache_options[] = { 312 OPT_STRING('a', "add", &add_name_list_str, 313 "file list", "file(s) to add"), 314 OPT_STRING('k', "kcore", &kcore_filename, 315 "file", "kcore file to add"), 316 OPT_STRING('r', "remove", &remove_name_list_str, "file list", 317 "file(s) to remove"), 318 OPT_STRING('p', "purge", &purge_name_list_str, "path list", 319 "path(s) to remove (remove old caches too)"), 320 OPT_STRING('M', "missing", &missing_filename, "file", 321 "to find missing build ids in the cache"), 322 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 323 OPT_STRING('u', "update", &update_name_list_str, "file list", 324 "file(s) to update"), 325 OPT_INCR('v', "verbose", &verbose, "be more verbose"), 326 OPT_END() 327 }; 328 const char * const buildid_cache_usage[] = { 329 "perf buildid-cache [<options>]", 330 NULL 331 }; 332 333 argc = parse_options(argc, argv, buildid_cache_options, 334 buildid_cache_usage, 0); 335 336 if (argc || (!add_name_list_str && !kcore_filename && 337 !remove_name_list_str && !purge_name_list_str && 338 !missing_filename && !update_name_list_str)) 339 usage_with_options(buildid_cache_usage, buildid_cache_options); 340 341 if (missing_filename) { 342 file.path = missing_filename; 343 file.force = force; 344 345 session = perf_session__new(&file, false, NULL); 346 if (session == NULL) 347 return -1; 348 } 349 350 if (symbol__init(session ? &session->header.env : NULL) < 0) 351 goto out; 352 353 setup_pager(); 354 355 if (add_name_list_str) { 356 list = strlist__new(add_name_list_str, NULL); 357 if (list) { 358 strlist__for_each(pos, list) 359 if (build_id_cache__add_file(pos->s)) { 360 if (errno == EEXIST) { 361 pr_debug("%s already in the cache\n", 362 pos->s); 363 continue; 364 } 365 pr_warning("Couldn't add %s: %s\n", 366 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 367 } 368 369 strlist__delete(list); 370 } 371 } 372 373 if (remove_name_list_str) { 374 list = strlist__new(remove_name_list_str, NULL); 375 if (list) { 376 strlist__for_each(pos, list) 377 if (build_id_cache__remove_file(pos->s)) { 378 if (errno == ENOENT) { 379 pr_debug("%s wasn't in the cache\n", 380 pos->s); 381 continue; 382 } 383 pr_warning("Couldn't remove %s: %s\n", 384 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 385 } 386 387 strlist__delete(list); 388 } 389 } 390 391 if (purge_name_list_str) { 392 list = strlist__new(purge_name_list_str, NULL); 393 if (list) { 394 strlist__for_each(pos, list) 395 if (build_id_cache__purge_path(pos->s)) { 396 if (errno == ENOENT) { 397 pr_debug("%s wasn't in the cache\n", 398 pos->s); 399 continue; 400 } 401 pr_warning("Couldn't remove %s: %s\n", 402 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 403 } 404 405 strlist__delete(list); 406 } 407 } 408 409 if (missing_filename) 410 ret = build_id_cache__fprintf_missing(session, stdout); 411 412 if (update_name_list_str) { 413 list = strlist__new(update_name_list_str, NULL); 414 if (list) { 415 strlist__for_each(pos, list) 416 if (build_id_cache__update_file(pos->s)) { 417 if (errno == ENOENT) { 418 pr_debug("%s wasn't in the cache\n", 419 pos->s); 420 continue; 421 } 422 pr_warning("Couldn't update %s: %s\n", 423 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 424 } 425 426 strlist__delete(list); 427 } 428 } 429 430 if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force)) 431 pr_warning("Couldn't add %s\n", kcore_filename); 432 433 out: 434 if (session) 435 perf_session__delete(session); 436 437 return ret; 438 } 439