tools/perf/builtin-buildid-cache.c

   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 "util/config.h"
  31 #include <linux/string.h>
  32 #include <linux/err.h>
  33
  34 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
  35 {
  36         char root_dir[PATH_MAX];
  37         char *p;
  38
  39         strlcpy(root_dir, proc_dir, sizeof(root_dir));
  40
  41         p = strrchr(root_dir, '/');
  42         if (!p)
  43                 return -1;
  44         *p = '\0';
  45         return sysfs__sprintf_build_id(root_dir, sbuildid);
  46 }
  47
  48 static int build_id_cache__kcore_dir(char *dir, size_t sz)
  49 {
  50         return fetch_current_timestamp(dir, sz);
  51 }
  52
  53 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir)
  54 {
  55         char from[PATH_MAX];
  56         char to[PATH_MAX];
  57         const char *name;
  58         u64 addr1 = 0, addr2 = 0;
  59         int i, err = -1;
  60
  61         scnprintf(from, sizeof(from), "%s/kallsyms", from_dir);
  62         scnprintf(to, sizeof(to), "%s/kallsyms", to_dir);
  63
  64         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
  65                 err = kallsyms__get_function_start(from, name, &addr1);
  66                 if (!err)
  67                         break;
  68         }
  69
  70         if (err)
  71                 return false;
  72
  73         if (kallsyms__get_function_start(to, name, &addr2))
  74                 return false;
  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/%s/%s",
 135                   buildid_dir, DSO__NAME_KCORE, 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/%s/%s/%s",
 147                   buildid_dir, DSO__NAME_KCORE, 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, struct nsinfo *nsi)
 176 {
 177         char sbuild_id[SBUILD_ID_SIZE];
 178         struct build_id bid;
 179         int err;
 180         struct nscookie nsc;
 181
 182         nsinfo__mountns_enter(nsi, &nsc);
 183         err = filename__read_build_id(filename, &bid);
 184         nsinfo__mountns_exit(&nsc);
 185         if (err < 0) {
 186                 pr_debug("Couldn't read a build-id in %s\n", filename);
 187                 return -1;
 188         }
 189
 190         build_id__sprintf(&bid, sbuild_id);
 191         err = build_id_cache__add_s(sbuild_id, filename, nsi,
 192                                     false, false);
 193         pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
 194                  err ? "FAIL" : "Ok");
 195         return err;
 196 }
 197
 198 static int build_id_cache__remove_file(const char *filename, struct nsinfo *nsi)
 199 {
 200         char sbuild_id[SBUILD_ID_SIZE];
 201         struct build_id bid;
 202         struct nscookie nsc;
 203
 204         int err;
 205
 206         nsinfo__mountns_enter(nsi, &nsc);
 207         err = filename__read_build_id(filename, &bid);
 208         nsinfo__mountns_exit(&nsc);
 209         if (err < 0) {
 210                 pr_debug("Couldn't read a build-id in %s\n", filename);
 211                 return -1;
 212         }
 213
 214         build_id__sprintf(&bid, sbuild_id);
 215         err = build_id_cache__remove_s(sbuild_id);
 216         pr_debug("Removing %s %s: %s\n", sbuild_id, filename,
 217                  err ? "FAIL" : "Ok");
 218
 219         return err;
 220 }
 221
 222 static int build_id_cache__purge_path(const char *pathname, struct nsinfo *nsi)
 223 {
 224         struct strlist *list;
 225         struct str_node *pos;
 226         int err;
 227
 228         err = build_id_cache__list_build_ids(pathname, nsi, &list);
 229         if (err)
 230                 goto out;
 231
 232         strlist__for_each_entry(pos, list) {
 233                 err = build_id_cache__remove_s(pos->s);
 234                 pr_debug("Removing %s %s: %s\n", pos->s, pathname,
 235                          err ? "FAIL" : "Ok");
 236                 if (err)
 237                         break;
 238         }
 239         strlist__delete(list);
 240
 241 out:
 242         pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok");
 243
 244         return err;
 245 }
 246
 247 static int build_id_cache__purge_all(void)
 248 {
 249         struct strlist *list;
 250         struct str_node *pos;
 251         int err = 0;
 252         char *buf;
 253
 254         list = build_id_cache__list_all(false);
 255         if (!list) {
 256                 pr_debug("Failed to get buildids: -%d\n", errno);
 257                 return -EINVAL;
 258         }
 259
 260         strlist__for_each_entry(pos, list) {
 261                 buf = build_id_cache__origname(pos->s);
 262                 err = build_id_cache__remove_s(pos->s);
 263                 pr_debug("Removing %s (%s): %s\n", buf, pos->s,
 264                          err ? "FAIL" : "Ok");
 265                 free(buf);
 266                 if (err)
 267                         break;
 268         }
 269         strlist__delete(list);
 270
 271         pr_debug("Purged all: %s\n", err ? "FAIL" : "Ok");
 272         return err;
 273 }
 274
 275 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
 276 {
 277         char filename[PATH_MAX];
 278         struct build_id bid;
 279
 280         if (dso__build_id_filename(dso, filename, sizeof(filename), false) &&
 281             filename__read_build_id(filename, &bid) == -1) {
 282                 if (errno == ENOENT)
 283                         return false;
 284
 285                 pr_warning("Problems with %s file, consider removing it from the cache\n",
 286                            filename);
 287         } else if (memcmp(dso->bid.data, bid.data, bid.size)) {
 288                 pr_warning("Problems with %s file, consider removing it from the cache\n",
 289                            filename);
 290         }
 291
 292         return true;
 293 }
 294
 295 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp)
 296 {
 297         perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0);
 298         return 0;
 299 }
 300
 301 static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi)
 302 {
 303         char sbuild_id[SBUILD_ID_SIZE];
 304         struct build_id bid;
 305         struct nscookie nsc;
 306
 307         int err;
 308
 309         nsinfo__mountns_enter(nsi, &nsc);
 310         err = filename__read_build_id(filename, &bid);
 311         nsinfo__mountns_exit(&nsc);
 312         if (err < 0) {
 313                 pr_debug("Couldn't read a build-id in %s\n", filename);
 314                 return -1;
 315         }
 316         err = 0;
 317
 318         build_id__sprintf(&bid, sbuild_id);
 319         if (build_id_cache__cached(sbuild_id))
 320                 err = build_id_cache__remove_s(sbuild_id);
 321
 322         if (!err)
 323                 err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
 324                                             false);
 325
 326         pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
 327                  err ? "FAIL" : "Ok");
 328
 329         return err;
 330 }
 331
 332 static int build_id_cache__show_all(void)
 333 {
 334         struct strlist *bidlist;
 335         struct str_node *nd;
 336         char *buf;
 337
 338         bidlist = build_id_cache__list_all(true);
 339         if (!bidlist) {
 340                 pr_debug("Failed to get buildids: -%d\n", errno);
 341                 return -1;
 342         }
 343         strlist__for_each_entry(nd, bidlist) {
 344                 buf = build_id_cache__origname(nd->s);
 345                 fprintf(stdout, "%s %s\n", nd->s, buf);
 346                 free(buf);
 347         }
 348         strlist__delete(bidlist);
 349         return 0;
 350 }
 351
 352 static int perf_buildid_cache_config(const char *var, const char *value, void *cb)
 353 {
 354         const char **debuginfod = cb;
 355
 356         if (!strcmp(var, "buildid-cache.debuginfod"))
 357                 *debuginfod = strdup(value);
 358
 359         return 0;
 360 }
 361
 362 int cmd_buildid_cache(int argc, const char **argv)
 363 {
 364         struct strlist *list;
 365         struct str_node *pos;
 366         int ret, ns_id = -1;
 367         bool force = false;
 368         bool list_files = false;
 369         bool opts_flag = false;
 370         bool purge_all = false;
 371         char const *add_name_list_str = NULL,
 372                    *remove_name_list_str = NULL,
 373                    *purge_name_list_str = NULL,
 374                    *missing_filename = NULL,
 375                    *update_name_list_str = NULL,
 376                    *kcore_filename = NULL,
 377                    *debuginfod = NULL;
 378         char sbuf[STRERR_BUFSIZE];
 379
 380         struct perf_data data = {
 381                 .mode  = PERF_DATA_MODE_READ,
 382         };
 383         struct perf_session *session = NULL;
 384         struct nsinfo *nsi = NULL;
 385
 386         const struct option buildid_cache_options[] = {
 387         OPT_STRING('a', "add", &add_name_list_str,
 388                    "file list", "file(s) to add"),
 389         OPT_STRING('k', "kcore", &kcore_filename,
 390                    "file", "kcore file to add"),
 391         OPT_STRING('r', "remove", &remove_name_list_str, "file list",
 392                     "file(s) to remove"),
 393         OPT_STRING('p', "purge", &purge_name_list_str, "file list",
 394                     "file(s) to remove (remove old caches too)"),
 395         OPT_BOOLEAN('P', "purge-all", &purge_all, "purge all cached files"),
 396         OPT_BOOLEAN('l', "list", &list_files, "list all cached files"),
 397         OPT_STRING('M', "missing", &missing_filename, "file",
 398                    "to find missing build ids in the cache"),
 399         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 400         OPT_STRING('u', "update", &update_name_list_str, "file list",
 401                     "file(s) to update"),
 402         OPT_STRING(0, "debuginfod", &debuginfod, "debuginfod url",
 403                     "set debuginfod url"),
 404         OPT_INCR('v', "verbose", &verbose, "be more verbose"),
 405         OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
 406         OPT_END()
 407         };
 408         const char * const buildid_cache_usage[] = {
 409                 "perf buildid-cache [<options>]",
 410                 NULL
 411         };
 412
 413         ret = perf_config(perf_buildid_cache_config, &debuginfod);
 414         if (ret)
 415                 return ret;
 416
 417         argc = parse_options(argc, argv, buildid_cache_options,
 418                              buildid_cache_usage, 0);
 419
 420         opts_flag = add_name_list_str || kcore_filename ||
 421                 remove_name_list_str || purge_name_list_str ||
 422                 missing_filename || update_name_list_str ||
 423                 purge_all;
 424
 425         if (argc || !(list_files || opts_flag))
 426                 usage_with_options(buildid_cache_usage, buildid_cache_options);
 427
 428         if (debuginfod) {
 429                 pr_debug("DEBUGINFOD_URLS=%s\n", debuginfod);
 430                 setenv("DEBUGINFOD_URLS", debuginfod, 1);
 431         }
 432
 433         /* -l is exclusive. It can not be used with other options. */
 434         if (list_files && opts_flag) {
 435                 usage_with_options_msg(buildid_cache_usage,
 436                         buildid_cache_options, "-l is exclusive.\n");
 437         }
 438
 439         if (ns_id > 0)
 440                 nsi = nsinfo__new(ns_id);
 441
 442         if (missing_filename) {
 443                 data.path  = missing_filename;
 444                 data.force = force;
 445
 446                 session = perf_session__new(&data, false, NULL);
 447                 if (IS_ERR(session))
 448                         return PTR_ERR(session);
 449         }
 450
 451         if (symbol__init(session ? &session->header.env : NULL) < 0)
 452                 goto out;
 453
 454         setup_pager();
 455
 456         if (list_files) {
 457                 ret = build_id_cache__show_all();
 458                 goto out;
 459         }
 460
 461         if (add_name_list_str) {
 462                 list = strlist__new(add_name_list_str, NULL);
 463                 if (list) {
 464                         strlist__for_each_entry(pos, list)
 465                                 if (build_id_cache__add_file(pos->s, nsi)) {
 466                                         if (errno == EEXIST) {
 467                                                 pr_debug("%s already in the cache\n",
 468                                                          pos->s);
 469                                                 continue;
 470                                         }
 471                                         pr_warning("Couldn't add %s: %s\n",
 472                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 473                                 }
 474
 475                         strlist__delete(list);
 476                 }
 477         }
 478
 479         if (remove_name_list_str) {
 480                 list = strlist__new(remove_name_list_str, NULL);
 481                 if (list) {
 482                         strlist__for_each_entry(pos, list)
 483                                 if (build_id_cache__remove_file(pos->s, nsi)) {
 484                                         if (errno == ENOENT) {
 485                                                 pr_debug("%s wasn't in the cache\n",
 486                                                          pos->s);
 487                                                 continue;
 488                                         }
 489                                         pr_warning("Couldn't remove %s: %s\n",
 490                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 491                                 }
 492
 493                         strlist__delete(list);
 494                 }
 495         }
 496
 497         if (purge_name_list_str) {
 498                 list = strlist__new(purge_name_list_str, NULL);
 499                 if (list) {
 500                         strlist__for_each_entry(pos, list)
 501                                 if (build_id_cache__purge_path(pos->s, nsi)) {
 502                                         if (errno == ENOENT) {
 503                                                 pr_debug("%s wasn't in the cache\n",
 504                                                          pos->s);
 505                                                 continue;
 506                                         }
 507                                         pr_warning("Couldn't remove %s: %s\n",
 508                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 509                                 }
 510
 511                         strlist__delete(list);
 512                 }
 513         }
 514
 515         if (purge_all) {
 516                 if (build_id_cache__purge_all()) {
 517                         pr_warning("Couldn't remove some caches. Error: %s.\n",
 518                                 str_error_r(errno, sbuf, sizeof(sbuf)));
 519                 }
 520         }
 521
 522         if (missing_filename)
 523                 ret = build_id_cache__fprintf_missing(session, stdout);
 524
 525         if (update_name_list_str) {
 526                 list = strlist__new(update_name_list_str, NULL);
 527                 if (list) {
 528                         strlist__for_each_entry(pos, list)
 529                                 if (build_id_cache__update_file(pos->s, nsi)) {
 530                                         if (errno == ENOENT) {
 531                                                 pr_debug("%s wasn't in the cache\n",
 532                                                          pos->s);
 533                                                 continue;
 534                                         }
 535                                         pr_warning("Couldn't update %s: %s\n",
 536                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 537                                 }
 538
 539                         strlist__delete(list);
 540                 }
 541         }
 542
 543         if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force))
 544                 pr_warning("Couldn't add %s\n", kcore_filename);
 545
 546 out:
 547         perf_session__delete(session);
 548         nsinfo__zput(nsi);
 549
 550         return ret;
 551 }