kernel/tools/perf/builtin-buildid-cache.c

   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 }