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 notes[PATH_MAX]; 29 u8 build_id[BUILD_ID_SIZE]; 30 char *p; 31 32 strlcpy(root_dir, proc_dir, sizeof(root_dir)); 33 34 p = strrchr(root_dir, '/'); 35 if (!p) 36 return -1; 37 *p = '\0'; 38 39 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); 40 41 if (sysfs__read_build_id(notes, build_id, sizeof(build_id))) 42 return -1; 43 44 build_id__sprintf(build_id, sizeof(build_id), sbuildid); 45 46 return 0; 47 } 48 49 static int build_id_cache__kcore_dir(char *dir, size_t sz) 50 { 51 struct timeval tv; 52 struct tm tm; 53 char dt[32]; 54 55 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm)) 56 return -1; 57 58 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm)) 59 return -1; 60 61 scnprintf(dir, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000); 62 63 return 0; 64 } 65 66 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir) 67 { 68 char from[PATH_MAX]; 69 char to[PATH_MAX]; 70 const char *name; 71 u64 addr1 = 0, addr2 = 0; 72 int i; 73 74 scnprintf(from, sizeof(from), "%s/kallsyms", from_dir); 75 scnprintf(to, sizeof(to), "%s/kallsyms", to_dir); 76 77 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) { 78 addr1 = kallsyms__get_function_start(from, name); 79 if (addr1) 80 break; 81 } 82 83 if (name) 84 addr2 = kallsyms__get_function_start(to, name); 85 86 return addr1 == addr2; 87 } 88 89 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir, 90 size_t to_dir_sz) 91 { 92 char from[PATH_MAX]; 93 char to[PATH_MAX]; 94 char to_subdir[PATH_MAX]; 95 struct dirent *dent; 96 int ret = -1; 97 DIR *d; 98 99 d = opendir(to_dir); 100 if (!d) 101 return -1; 102 103 scnprintf(from, sizeof(from), "%s/modules", from_dir); 104 105 while (1) { 106 dent = readdir(d); 107 if (!dent) 108 break; 109 if (dent->d_type != DT_DIR) 110 continue; 111 scnprintf(to, sizeof(to), "%s/%s/modules", to_dir, 112 dent->d_name); 113 scnprintf(to_subdir, sizeof(to_subdir), "%s/%s", 114 to_dir, dent->d_name); 115 if (!compare_proc_modules(from, to) && 116 same_kallsyms_reloc(from_dir, to_subdir)) { 117 strlcpy(to_dir, to_subdir, to_dir_sz); 118 ret = 0; 119 break; 120 } 121 } 122 123 closedir(d); 124 125 return ret; 126 } 127 128 static int build_id_cache__add_kcore(const char *filename, bool force) 129 { 130 char dir[32], sbuildid[BUILD_ID_SIZE * 2 + 1]; 131 char from_dir[PATH_MAX], to_dir[PATH_MAX]; 132 char *p; 133 134 strlcpy(from_dir, filename, sizeof(from_dir)); 135 136 p = strrchr(from_dir, '/'); 137 if (!p || strcmp(p + 1, "kcore")) 138 return -1; 139 *p = '\0'; 140 141 if (build_id_cache__kcore_buildid(from_dir, sbuildid)) 142 return -1; 143 144 scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s", 145 buildid_dir, sbuildid); 146 147 if (!force && 148 !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) { 149 pr_debug("same kcore found in %s\n", to_dir); 150 return 0; 151 } 152 153 if (build_id_cache__kcore_dir(dir, sizeof(dir))) 154 return -1; 155 156 scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s/%s", 157 buildid_dir, sbuildid, dir); 158 159 if (mkdir_p(to_dir, 0755)) 160 return -1; 161 162 if (kcore_copy(from_dir, to_dir)) { 163 /* Remove YYYYmmddHHMMSShh directory */ 164 if (!rmdir(to_dir)) { 165 p = strrchr(to_dir, '/'); 166 if (p) 167 *p = '\0'; 168 /* Try to remove buildid directory */ 169 if (!rmdir(to_dir)) { 170 p = strrchr(to_dir, '/'); 171 if (p) 172 *p = '\0'; 173 /* Try to remove [kernel.kcore] directory */ 174 rmdir(to_dir); 175 } 176 } 177 return -1; 178 } 179 180 pr_debug("kcore added to build-id cache directory %s\n", to_dir); 181 182 return 0; 183 } 184 185 static int build_id_cache__add_file(const char *filename) 186 { 187 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 188 u8 build_id[BUILD_ID_SIZE]; 189 int err; 190 191 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 192 pr_debug("Couldn't read a build-id in %s\n", filename); 193 return -1; 194 } 195 196 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 197 err = build_id_cache__add_s(sbuild_id, filename, 198 false, false); 199 pr_debug("Adding %s %s: %s\n", sbuild_id, filename, 200 err ? "FAIL" : "Ok"); 201 return err; 202 } 203 204 static int build_id_cache__remove_file(const char *filename) 205 { 206 u8 build_id[BUILD_ID_SIZE]; 207 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 208 209 int err; 210 211 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 212 pr_debug("Couldn't read a build-id in %s\n", filename); 213 return -1; 214 } 215 216 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 217 err = build_id_cache__remove_s(sbuild_id); 218 pr_debug("Removing %s %s: %s\n", sbuild_id, filename, 219 err ? "FAIL" : "Ok"); 220 221 return err; 222 } 223 224 static int build_id_cache__purge_path(const char *pathname) 225 { 226 struct strlist *list; 227 struct str_node *pos; 228 int err; 229 230 err = build_id_cache__list_build_ids(pathname, &list); 231 if (err) 232 goto out; 233 234 strlist__for_each(pos, list) { 235 err = build_id_cache__remove_s(pos->s); 236 pr_debug("Removing %s %s: %s\n", pos->s, pathname, 237 err ? "FAIL" : "Ok"); 238 if (err) 239 break; 240 } 241 strlist__delete(list); 242 243 out: 244 pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok"); 245 246 return err; 247 } 248 249 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused) 250 { 251 char filename[PATH_MAX]; 252 u8 build_id[BUILD_ID_SIZE]; 253 254 if (dso__build_id_filename(dso, filename, sizeof(filename)) && 255 filename__read_build_id(filename, build_id, 256 sizeof(build_id)) != sizeof(build_id)) { 257 if (errno == ENOENT) 258 return false; 259 260 pr_warning("Problems with %s file, consider removing it from the cache\n", 261 filename); 262 } else if (memcmp(dso->build_id, build_id, sizeof(dso->build_id))) { 263 pr_warning("Problems with %s file, consider removing it from the cache\n", 264 filename); 265 } 266 267 return true; 268 } 269 270 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp) 271 { 272 perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0); 273 return 0; 274 } 275 276 static int build_id_cache__update_file(const char *filename) 277 { 278 u8 build_id[BUILD_ID_SIZE]; 279 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 280 281 int err = 0; 282 283 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 284 pr_debug("Couldn't read a build-id in %s\n", filename); 285 return -1; 286 } 287 288 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 289 if (build_id_cache__cached(sbuild_id)) 290 err = build_id_cache__remove_s(sbuild_id); 291 292 if (!err) 293 err = build_id_cache__add_s(sbuild_id, filename, false, false); 294 295 pr_debug("Updating %s %s: %s\n", sbuild_id, filename, 296 err ? "FAIL" : "Ok"); 297 298 return err; 299 } 300 301 int cmd_buildid_cache(int argc, const char **argv, 302 const char *prefix __maybe_unused) 303 { 304 struct strlist *list; 305 struct str_node *pos; 306 int ret = 0; 307 bool force = false; 308 char const *add_name_list_str = NULL, 309 *remove_name_list_str = NULL, 310 *purge_name_list_str = NULL, 311 *missing_filename = NULL, 312 *update_name_list_str = NULL, 313 *kcore_filename = NULL; 314 char sbuf[STRERR_BUFSIZE]; 315 316 struct perf_data_file file = { 317 .mode = PERF_DATA_MODE_READ, 318 }; 319 struct perf_session *session = NULL; 320 321 const struct option buildid_cache_options[] = { 322 OPT_STRING('a', "add", &add_name_list_str, 323 "file list", "file(s) to add"), 324 OPT_STRING('k', "kcore", &kcore_filename, 325 "file", "kcore file to add"), 326 OPT_STRING('r', "remove", &remove_name_list_str, "file list", 327 "file(s) to remove"), 328 OPT_STRING('p', "purge", &purge_name_list_str, "path list", 329 "path(s) to remove (remove old caches too)"), 330 OPT_STRING('M', "missing", &missing_filename, "file", 331 "to find missing build ids in the cache"), 332 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 333 OPT_STRING('u', "update", &update_name_list_str, "file list", 334 "file(s) to update"), 335 OPT_INCR('v', "verbose", &verbose, "be more verbose"), 336 OPT_END() 337 }; 338 const char * const buildid_cache_usage[] = { 339 "perf buildid-cache [<options>]", 340 NULL 341 }; 342 343 argc = parse_options(argc, argv, buildid_cache_options, 344 buildid_cache_usage, 0); 345 346 if (argc || (!add_name_list_str && !kcore_filename && 347 !remove_name_list_str && !purge_name_list_str && 348 !missing_filename && !update_name_list_str)) 349 usage_with_options(buildid_cache_usage, buildid_cache_options); 350 351 if (missing_filename) { 352 file.path = missing_filename; 353 file.force = force; 354 355 session = perf_session__new(&file, false, NULL); 356 if (session == NULL) 357 return -1; 358 } 359 360 if (symbol__init(session ? &session->header.env : NULL) < 0) 361 goto out; 362 363 setup_pager(); 364 365 if (add_name_list_str) { 366 list = strlist__new(true, add_name_list_str); 367 if (list) { 368 strlist__for_each(pos, list) 369 if (build_id_cache__add_file(pos->s)) { 370 if (errno == EEXIST) { 371 pr_debug("%s already in the cache\n", 372 pos->s); 373 continue; 374 } 375 pr_warning("Couldn't add %s: %s\n", 376 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 377 } 378 379 strlist__delete(list); 380 } 381 } 382 383 if (remove_name_list_str) { 384 list = strlist__new(true, remove_name_list_str); 385 if (list) { 386 strlist__for_each(pos, list) 387 if (build_id_cache__remove_file(pos->s)) { 388 if (errno == ENOENT) { 389 pr_debug("%s wasn't in the cache\n", 390 pos->s); 391 continue; 392 } 393 pr_warning("Couldn't remove %s: %s\n", 394 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 395 } 396 397 strlist__delete(list); 398 } 399 } 400 401 if (purge_name_list_str) { 402 list = strlist__new(true, purge_name_list_str); 403 if (list) { 404 strlist__for_each(pos, list) 405 if (build_id_cache__purge_path(pos->s)) { 406 if (errno == ENOENT) { 407 pr_debug("%s wasn't in the cache\n", 408 pos->s); 409 continue; 410 } 411 pr_warning("Couldn't remove %s: %s\n", 412 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 413 } 414 415 strlist__delete(list); 416 } 417 } 418 419 if (missing_filename) 420 ret = build_id_cache__fprintf_missing(session, stdout); 421 422 if (update_name_list_str) { 423 list = strlist__new(true, update_name_list_str); 424 if (list) { 425 strlist__for_each(pos, list) 426 if (build_id_cache__update_file(pos->s)) { 427 if (errno == ENOENT) { 428 pr_debug("%s wasn't in the cache\n", 429 pos->s); 430 continue; 431 } 432 pr_warning("Couldn't update %s: %s\n", 433 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 434 } 435 436 strlist__delete(list); 437 } 438 } 439 440 if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force)) 441 pr_warning("Couldn't add %s\n", kcore_filename); 442 443 out: 444 if (session) 445 perf_session__delete(session); 446 447 return ret; 448 } 449