1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * builtin-buildid-cache.c 4 * 5 * Builtin buildid-cache command: Manages build-id cache 6 * 7 * Copyright (C) 2010, Red Hat Inc. 8 * Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com> 9 */ 10 #include <sys/types.h> 11 #include <sys/time.h> 12 #include <time.h> 13 #include <dirent.h> 14 #include <errno.h> 15 #include <unistd.h> 16 #include "builtin.h" 17 #include "namespaces.h" 18 #include "util/debug.h" 19 #include "util/header.h" 20 #include <subcmd/pager.h> 21 #include <subcmd/parse-options.h> 22 #include "util/strlist.h" 23 #include "util/build-id.h" 24 #include "util/session.h" 25 #include "util/dso.h" 26 #include "util/symbol.h" 27 #include "util/time-utils.h" 28 #include "util/util.h" 29 #include "util/probe-file.h" 30 #include <linux/string.h> 31 32 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid) 33 { 34 char root_dir[PATH_MAX]; 35 char *p; 36 37 strlcpy(root_dir, proc_dir, sizeof(root_dir)); 38 39 p = strrchr(root_dir, '/'); 40 if (!p) 41 return -1; 42 *p = '\0'; 43 return sysfs__sprintf_build_id(root_dir, sbuildid); 44 } 45 46 static int build_id_cache__kcore_dir(char *dir, size_t sz) 47 { 48 return fetch_current_timestamp(dir, sz); 49 } 50 51 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir) 52 { 53 char from[PATH_MAX]; 54 char to[PATH_MAX]; 55 const char *name; 56 u64 addr1 = 0, addr2 = 0; 57 int i, err = -1; 58 59 scnprintf(from, sizeof(from), "%s/kallsyms", from_dir); 60 scnprintf(to, sizeof(to), "%s/kallsyms", to_dir); 61 62 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) { 63 err = kallsyms__get_function_start(from, name, &addr1); 64 if (!err) 65 break; 66 } 67 68 if (err) 69 return false; 70 71 if (kallsyms__get_function_start(to, name, &addr2)) 72 return false; 73 74 return addr1 == addr2; 75 } 76 77 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir, 78 size_t to_dir_sz) 79 { 80 char from[PATH_MAX]; 81 char to[PATH_MAX]; 82 char to_subdir[PATH_MAX]; 83 struct dirent *dent; 84 int ret = -1; 85 DIR *d; 86 87 d = opendir(to_dir); 88 if (!d) 89 return -1; 90 91 scnprintf(from, sizeof(from), "%s/modules", from_dir); 92 93 while (1) { 94 dent = readdir(d); 95 if (!dent) 96 break; 97 if (dent->d_type != DT_DIR) 98 continue; 99 scnprintf(to, sizeof(to), "%s/%s/modules", to_dir, 100 dent->d_name); 101 scnprintf(to_subdir, sizeof(to_subdir), "%s/%s", 102 to_dir, dent->d_name); 103 if (!compare_proc_modules(from, to) && 104 same_kallsyms_reloc(from_dir, to_subdir)) { 105 strlcpy(to_dir, to_subdir, to_dir_sz); 106 ret = 0; 107 break; 108 } 109 } 110 111 closedir(d); 112 113 return ret; 114 } 115 116 static int build_id_cache__add_kcore(const char *filename, bool force) 117 { 118 char dir[32], sbuildid[SBUILD_ID_SIZE]; 119 char from_dir[PATH_MAX], to_dir[PATH_MAX]; 120 char *p; 121 122 strlcpy(from_dir, filename, sizeof(from_dir)); 123 124 p = strrchr(from_dir, '/'); 125 if (!p || strcmp(p + 1, "kcore")) 126 return -1; 127 *p = '\0'; 128 129 if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0) 130 return -1; 131 132 scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s", 133 buildid_dir, DSO__NAME_KCORE, sbuildid); 134 135 if (!force && 136 !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) { 137 pr_debug("same kcore found in %s\n", to_dir); 138 return 0; 139 } 140 141 if (build_id_cache__kcore_dir(dir, sizeof(dir))) 142 return -1; 143 144 scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s", 145 buildid_dir, DSO__NAME_KCORE, sbuildid, dir); 146 147 if (mkdir_p(to_dir, 0755)) 148 return -1; 149 150 if (kcore_copy(from_dir, to_dir)) { 151 /* Remove YYYYmmddHHMMSShh directory */ 152 if (!rmdir(to_dir)) { 153 p = strrchr(to_dir, '/'); 154 if (p) 155 *p = '\0'; 156 /* Try to remove buildid directory */ 157 if (!rmdir(to_dir)) { 158 p = strrchr(to_dir, '/'); 159 if (p) 160 *p = '\0'; 161 /* Try to remove [kernel.kcore] directory */ 162 rmdir(to_dir); 163 } 164 } 165 return -1; 166 } 167 168 pr_debug("kcore added to build-id cache directory %s\n", to_dir); 169 170 return 0; 171 } 172 173 static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi) 174 { 175 char sbuild_id[SBUILD_ID_SIZE]; 176 u8 build_id[BUILD_ID_SIZE]; 177 int err; 178 struct nscookie nsc; 179 180 nsinfo__mountns_enter(nsi, &nsc); 181 err = filename__read_build_id(filename, &build_id, sizeof(build_id)); 182 nsinfo__mountns_exit(&nsc); 183 if (err < 0) { 184 pr_debug("Couldn't read a build-id in %s\n", filename); 185 return -1; 186 } 187 188 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 189 err = build_id_cache__add_s(sbuild_id, filename, nsi, 190 false, false); 191 pr_debug("Adding %s %s: %s\n", sbuild_id, filename, 192 err ? "FAIL" : "Ok"); 193 return err; 194 } 195 196 static int build_id_cache__remove_file(const char *filename, struct nsinfo *nsi) 197 { 198 u8 build_id[BUILD_ID_SIZE]; 199 char sbuild_id[SBUILD_ID_SIZE]; 200 struct nscookie nsc; 201 202 int err; 203 204 nsinfo__mountns_enter(nsi, &nsc); 205 err = filename__read_build_id(filename, &build_id, sizeof(build_id)); 206 nsinfo__mountns_exit(&nsc); 207 if (err < 0) { 208 pr_debug("Couldn't read a build-id in %s\n", filename); 209 return -1; 210 } 211 212 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 213 err = build_id_cache__remove_s(sbuild_id); 214 pr_debug("Removing %s %s: %s\n", sbuild_id, filename, 215 err ? "FAIL" : "Ok"); 216 217 return err; 218 } 219 220 static int build_id_cache__purge_path(const char *pathname, struct nsinfo *nsi) 221 { 222 struct strlist *list; 223 struct str_node *pos; 224 int err; 225 226 err = build_id_cache__list_build_ids(pathname, nsi, &list); 227 if (err) 228 goto out; 229 230 strlist__for_each_entry(pos, list) { 231 err = build_id_cache__remove_s(pos->s); 232 pr_debug("Removing %s %s: %s\n", pos->s, pathname, 233 err ? "FAIL" : "Ok"); 234 if (err) 235 break; 236 } 237 strlist__delete(list); 238 239 out: 240 pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok"); 241 242 return err; 243 } 244 245 static int build_id_cache__purge_all(void) 246 { 247 struct strlist *list; 248 struct str_node *pos; 249 int err = 0; 250 char *buf; 251 252 list = build_id_cache__list_all(false); 253 if (!list) { 254 pr_debug("Failed to get buildids: -%d\n", errno); 255 return -EINVAL; 256 } 257 258 strlist__for_each_entry(pos, list) { 259 buf = build_id_cache__origname(pos->s); 260 err = build_id_cache__remove_s(pos->s); 261 pr_debug("Removing %s (%s): %s\n", buf, pos->s, 262 err ? "FAIL" : "Ok"); 263 free(buf); 264 if (err) 265 break; 266 } 267 strlist__delete(list); 268 269 pr_debug("Purged all: %s\n", err ? "FAIL" : "Ok"); 270 return err; 271 } 272 273 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused) 274 { 275 char filename[PATH_MAX]; 276 u8 build_id[BUILD_ID_SIZE]; 277 278 if (dso__build_id_filename(dso, filename, sizeof(filename), false) && 279 filename__read_build_id(filename, build_id, 280 sizeof(build_id)) != sizeof(build_id)) { 281 if (errno == ENOENT) 282 return false; 283 284 pr_warning("Problems with %s file, consider removing it from the cache\n", 285 filename); 286 } else if (memcmp(dso->build_id, build_id, sizeof(dso->build_id))) { 287 pr_warning("Problems with %s file, consider removing it from the cache\n", 288 filename); 289 } 290 291 return true; 292 } 293 294 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp) 295 { 296 perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0); 297 return 0; 298 } 299 300 static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi) 301 { 302 u8 build_id[BUILD_ID_SIZE]; 303 char sbuild_id[SBUILD_ID_SIZE]; 304 struct nscookie nsc; 305 306 int err; 307 308 nsinfo__mountns_enter(nsi, &nsc); 309 err = filename__read_build_id(filename, &build_id, sizeof(build_id)); 310 nsinfo__mountns_exit(&nsc); 311 if (err < 0) { 312 pr_debug("Couldn't read a build-id in %s\n", filename); 313 return -1; 314 } 315 err = 0; 316 317 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 318 if (build_id_cache__cached(sbuild_id)) 319 err = build_id_cache__remove_s(sbuild_id); 320 321 if (!err) 322 err = build_id_cache__add_s(sbuild_id, filename, nsi, false, 323 false); 324 325 pr_debug("Updating %s %s: %s\n", sbuild_id, filename, 326 err ? "FAIL" : "Ok"); 327 328 return err; 329 } 330 331 static int build_id_cache__show_all(void) 332 { 333 struct strlist *bidlist; 334 struct str_node *nd; 335 char *buf; 336 337 bidlist = build_id_cache__list_all(true); 338 if (!bidlist) { 339 pr_debug("Failed to get buildids: -%d\n", errno); 340 return -1; 341 } 342 strlist__for_each_entry(nd, bidlist) { 343 buf = build_id_cache__origname(nd->s); 344 fprintf(stdout, "%s %s\n", nd->s, buf); 345 free(buf); 346 } 347 strlist__delete(bidlist); 348 return 0; 349 } 350 351 int cmd_buildid_cache(int argc, const char **argv) 352 { 353 struct strlist *list; 354 struct str_node *pos; 355 int ret = 0; 356 int ns_id = -1; 357 bool force = false; 358 bool list_files = false; 359 bool opts_flag = false; 360 bool purge_all = false; 361 char const *add_name_list_str = NULL, 362 *remove_name_list_str = NULL, 363 *purge_name_list_str = NULL, 364 *missing_filename = NULL, 365 *update_name_list_str = NULL, 366 *kcore_filename = NULL; 367 char sbuf[STRERR_BUFSIZE]; 368 369 struct perf_data data = { 370 .mode = PERF_DATA_MODE_READ, 371 }; 372 struct perf_session *session = NULL; 373 struct nsinfo *nsi = NULL; 374 375 const struct option buildid_cache_options[] = { 376 OPT_STRING('a', "add", &add_name_list_str, 377 "file list", "file(s) to add"), 378 OPT_STRING('k', "kcore", &kcore_filename, 379 "file", "kcore file to add"), 380 OPT_STRING('r', "remove", &remove_name_list_str, "file list", 381 "file(s) to remove"), 382 OPT_STRING('p', "purge", &purge_name_list_str, "file list", 383 "file(s) to remove (remove old caches too)"), 384 OPT_BOOLEAN('P', "purge-all", &purge_all, "purge all cached files"), 385 OPT_BOOLEAN('l', "list", &list_files, "list all cached files"), 386 OPT_STRING('M', "missing", &missing_filename, "file", 387 "to find missing build ids in the cache"), 388 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 389 OPT_STRING('u', "update", &update_name_list_str, "file list", 390 "file(s) to update"), 391 OPT_INCR('v', "verbose", &verbose, "be more verbose"), 392 OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"), 393 OPT_END() 394 }; 395 const char * const buildid_cache_usage[] = { 396 "perf buildid-cache [<options>]", 397 NULL 398 }; 399 400 argc = parse_options(argc, argv, buildid_cache_options, 401 buildid_cache_usage, 0); 402 403 opts_flag = add_name_list_str || kcore_filename || 404 remove_name_list_str || purge_name_list_str || 405 missing_filename || update_name_list_str || 406 purge_all; 407 408 if (argc || !(list_files || opts_flag)) 409 usage_with_options(buildid_cache_usage, buildid_cache_options); 410 411 /* -l is exclusive. It can not be used with other options. */ 412 if (list_files && opts_flag) { 413 usage_with_options_msg(buildid_cache_usage, 414 buildid_cache_options, "-l is exclusive.\n"); 415 } 416 417 if (ns_id > 0) 418 nsi = nsinfo__new(ns_id); 419 420 if (missing_filename) { 421 data.path = missing_filename; 422 data.force = force; 423 424 session = perf_session__new(&data, false, NULL); 425 if (session == NULL) 426 return -1; 427 } 428 429 if (symbol__init(session ? &session->header.env : NULL) < 0) 430 goto out; 431 432 setup_pager(); 433 434 if (list_files) { 435 ret = build_id_cache__show_all(); 436 goto out; 437 } 438 439 if (add_name_list_str) { 440 list = strlist__new(add_name_list_str, NULL); 441 if (list) { 442 strlist__for_each_entry(pos, list) 443 if (build_id_cache__add_file(pos->s, nsi)) { 444 if (errno == EEXIST) { 445 pr_debug("%s already in the cache\n", 446 pos->s); 447 continue; 448 } 449 pr_warning("Couldn't add %s: %s\n", 450 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 451 } 452 453 strlist__delete(list); 454 } 455 } 456 457 if (remove_name_list_str) { 458 list = strlist__new(remove_name_list_str, NULL); 459 if (list) { 460 strlist__for_each_entry(pos, list) 461 if (build_id_cache__remove_file(pos->s, nsi)) { 462 if (errno == ENOENT) { 463 pr_debug("%s wasn't in the cache\n", 464 pos->s); 465 continue; 466 } 467 pr_warning("Couldn't remove %s: %s\n", 468 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 469 } 470 471 strlist__delete(list); 472 } 473 } 474 475 if (purge_name_list_str) { 476 list = strlist__new(purge_name_list_str, NULL); 477 if (list) { 478 strlist__for_each_entry(pos, list) 479 if (build_id_cache__purge_path(pos->s, nsi)) { 480 if (errno == ENOENT) { 481 pr_debug("%s wasn't in the cache\n", 482 pos->s); 483 continue; 484 } 485 pr_warning("Couldn't remove %s: %s\n", 486 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 487 } 488 489 strlist__delete(list); 490 } 491 } 492 493 if (purge_all) { 494 if (build_id_cache__purge_all()) { 495 pr_warning("Couldn't remove some caches. Error: %s.\n", 496 str_error_r(errno, sbuf, sizeof(sbuf))); 497 } 498 } 499 500 if (missing_filename) 501 ret = build_id_cache__fprintf_missing(session, stdout); 502 503 if (update_name_list_str) { 504 list = strlist__new(update_name_list_str, NULL); 505 if (list) { 506 strlist__for_each_entry(pos, list) 507 if (build_id_cache__update_file(pos->s, nsi)) { 508 if (errno == ENOENT) { 509 pr_debug("%s wasn't in the cache\n", 510 pos->s); 511 continue; 512 } 513 pr_warning("Couldn't update %s: %s\n", 514 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 515 } 516 517 strlist__delete(list); 518 } 519 } 520 521 if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force)) 522 pr_warning("Couldn't add %s\n", kcore_filename); 523 524 out: 525 perf_session__delete(session); 526 nsinfo__zput(nsi); 527 528 return ret; 529 } 530