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 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 }