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, const char *debugdir, 129 bool force) 130 { 131 char dir[32], sbuildid[BUILD_ID_SIZE * 2 + 1]; 132 char from_dir[PATH_MAX], to_dir[PATH_MAX]; 133 char *p; 134 135 strlcpy(from_dir, filename, sizeof(from_dir)); 136 137 p = strrchr(from_dir, '/'); 138 if (!p || strcmp(p + 1, "kcore")) 139 return -1; 140 *p = '\0'; 141 142 if (build_id_cache__kcore_buildid(from_dir, sbuildid)) 143 return -1; 144 145 scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s", 146 debugdir, sbuildid); 147 148 if (!force && 149 !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) { 150 pr_debug("same kcore found in %s\n", to_dir); 151 return 0; 152 } 153 154 if (build_id_cache__kcore_dir(dir, sizeof(dir))) 155 return -1; 156 157 scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s/%s", 158 debugdir, sbuildid, dir); 159 160 if (mkdir_p(to_dir, 0755)) 161 return -1; 162 163 if (kcore_copy(from_dir, to_dir)) { 164 /* Remove YYYYmmddHHMMSShh directory */ 165 if (!rmdir(to_dir)) { 166 p = strrchr(to_dir, '/'); 167 if (p) 168 *p = '\0'; 169 /* Try to remove buildid directory */ 170 if (!rmdir(to_dir)) { 171 p = strrchr(to_dir, '/'); 172 if (p) 173 *p = '\0'; 174 /* Try to remove [kernel.kcore] directory */ 175 rmdir(to_dir); 176 } 177 } 178 return -1; 179 } 180 181 pr_debug("kcore added to build-id cache directory %s\n", to_dir); 182 183 return 0; 184 } 185 186 static int build_id_cache__add_file(const char *filename, const char *debugdir) 187 { 188 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 189 u8 build_id[BUILD_ID_SIZE]; 190 int err; 191 192 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 193 pr_debug("Couldn't read a build-id in %s\n", filename); 194 return -1; 195 } 196 197 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 198 err = build_id_cache__add_s(sbuild_id, debugdir, filename, 199 false, false); 200 if (verbose) 201 pr_info("Adding %s %s: %s\n", sbuild_id, filename, 202 err ? "FAIL" : "Ok"); 203 return err; 204 } 205 206 static int build_id_cache__remove_file(const char *filename, 207 const char *debugdir) 208 { 209 u8 build_id[BUILD_ID_SIZE]; 210 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 211 212 int err; 213 214 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 215 pr_debug("Couldn't read a build-id in %s\n", filename); 216 return -1; 217 } 218 219 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 220 err = build_id_cache__remove_s(sbuild_id, debugdir); 221 if (verbose) 222 pr_info("Removing %s %s: %s\n", sbuild_id, filename, 223 err ? "FAIL" : "Ok"); 224 225 return err; 226 } 227 228 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused) 229 { 230 char filename[PATH_MAX]; 231 u8 build_id[BUILD_ID_SIZE]; 232 233 if (dso__build_id_filename(dso, filename, sizeof(filename)) && 234 filename__read_build_id(filename, build_id, 235 sizeof(build_id)) != sizeof(build_id)) { 236 if (errno == ENOENT) 237 return false; 238 239 pr_warning("Problems with %s file, consider removing it from the cache\n", 240 filename); 241 } else if (memcmp(dso->build_id, build_id, sizeof(dso->build_id))) { 242 pr_warning("Problems with %s file, consider removing it from the cache\n", 243 filename); 244 } 245 246 return true; 247 } 248 249 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp) 250 { 251 perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0); 252 return 0; 253 } 254 255 static int build_id_cache__update_file(const char *filename, 256 const char *debugdir) 257 { 258 u8 build_id[BUILD_ID_SIZE]; 259 char sbuild_id[BUILD_ID_SIZE * 2 + 1]; 260 261 int err; 262 263 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 264 pr_debug("Couldn't read a build-id in %s\n", filename); 265 return -1; 266 } 267 268 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 269 err = build_id_cache__remove_s(sbuild_id, debugdir); 270 if (!err) { 271 err = build_id_cache__add_s(sbuild_id, debugdir, filename, 272 false, false); 273 } 274 if (verbose) 275 pr_info("Updating %s %s: %s\n", sbuild_id, filename, 276 err ? "FAIL" : "Ok"); 277 278 return err; 279 } 280 281 int cmd_buildid_cache(int argc, const char **argv, 282 const char *prefix __maybe_unused) 283 { 284 struct strlist *list; 285 struct str_node *pos; 286 int ret = 0; 287 bool force = false; 288 char const *add_name_list_str = NULL, 289 *remove_name_list_str = NULL, 290 *missing_filename = NULL, 291 *update_name_list_str = NULL, 292 *kcore_filename = NULL; 293 char sbuf[STRERR_BUFSIZE]; 294 295 struct perf_data_file file = { 296 .mode = PERF_DATA_MODE_READ, 297 }; 298 struct perf_session *session = NULL; 299 300 const struct option buildid_cache_options[] = { 301 OPT_STRING('a', "add", &add_name_list_str, 302 "file list", "file(s) to add"), 303 OPT_STRING('k', "kcore", &kcore_filename, 304 "file", "kcore file to add"), 305 OPT_STRING('r', "remove", &remove_name_list_str, "file list", 306 "file(s) to remove"), 307 OPT_STRING('M', "missing", &missing_filename, "file", 308 "to find missing build ids in the cache"), 309 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 310 OPT_STRING('u', "update", &update_name_list_str, "file list", 311 "file(s) to update"), 312 OPT_INCR('v', "verbose", &verbose, "be more verbose"), 313 OPT_END() 314 }; 315 const char * const buildid_cache_usage[] = { 316 "perf buildid-cache [<options>]", 317 NULL 318 }; 319 320 argc = parse_options(argc, argv, buildid_cache_options, 321 buildid_cache_usage, 0); 322 323 if (missing_filename) { 324 file.path = missing_filename; 325 file.force = force; 326 327 session = perf_session__new(&file, false, NULL); 328 if (session == NULL) 329 return -1; 330 } 331 332 if (symbol__init(session ? &session->header.env : NULL) < 0) 333 goto out; 334 335 setup_pager(); 336 337 if (add_name_list_str) { 338 list = strlist__new(true, add_name_list_str); 339 if (list) { 340 strlist__for_each(pos, list) 341 if (build_id_cache__add_file(pos->s, buildid_dir)) { 342 if (errno == EEXIST) { 343 pr_debug("%s already in the cache\n", 344 pos->s); 345 continue; 346 } 347 pr_warning("Couldn't add %s: %s\n", 348 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 349 } 350 351 strlist__delete(list); 352 } 353 } 354 355 if (remove_name_list_str) { 356 list = strlist__new(true, remove_name_list_str); 357 if (list) { 358 strlist__for_each(pos, list) 359 if (build_id_cache__remove_file(pos->s, buildid_dir)) { 360 if (errno == ENOENT) { 361 pr_debug("%s wasn't in the cache\n", 362 pos->s); 363 continue; 364 } 365 pr_warning("Couldn't remove %s: %s\n", 366 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 367 } 368 369 strlist__delete(list); 370 } 371 } 372 373 if (missing_filename) 374 ret = build_id_cache__fprintf_missing(session, stdout); 375 376 if (update_name_list_str) { 377 list = strlist__new(true, update_name_list_str); 378 if (list) { 379 strlist__for_each(pos, list) 380 if (build_id_cache__update_file(pos->s, buildid_dir)) { 381 if (errno == ENOENT) { 382 pr_debug("%s wasn't in the cache\n", 383 pos->s); 384 continue; 385 } 386 pr_warning("Couldn't update %s: %s\n", 387 pos->s, strerror_r(errno, sbuf, sizeof(sbuf))); 388 } 389 390 strlist__delete(list); 391 } 392 } 393 394 if (kcore_filename && 395 build_id_cache__add_kcore(kcore_filename, buildid_dir, force)) 396 pr_warning("Couldn't add %s\n", kcore_filename); 397 398 out: 399 if (session) 400 perf_session__delete(session); 401 402 return ret; 403 } 404