tools/perf/builtin-trace.c

   1 #include "builtin.h"
   2
   3 #include "perf.h"
   4 #include "util/cache.h"
   5 #include "util/debug.h"
   6 #include "util/exec_cmd.h"
   7 #include "util/header.h"
   8 #include "util/parse-options.h"
   9 #include "util/session.h"
  10 #include "util/symbol.h"
  11 #include "util/thread.h"
  12 #include "util/trace-event.h"
  13 #include "util/util.h"
  14
  15 static char const               *script_name;
  16 static char const               *generate_script_lang;
  17 static bool                     debug_mode;
  18 static u64                      last_timestamp;
  19 static u64                      nr_unordered;
  20
  21 static int default_start_script(const char *script __unused,
  22                                 int argc __unused,
  23                                 const char **argv __unused)
  24 {
  25         return 0;
  26 }
  27
  28 static int default_stop_script(void)
  29 {
  30         return 0;
  31 }
  32
  33 static int default_generate_script(const char *outfile __unused)
  34 {
  35         return 0;
  36 }
  37
  38 static struct scripting_ops default_scripting_ops = {
  39         .start_script           = default_start_script,
  40         .stop_script            = default_stop_script,
  41         .process_event          = print_event,
  42         .generate_script        = default_generate_script,
  43 };
  44
  45 static struct scripting_ops     *scripting_ops;
  46
  47 static void setup_scripting(void)
  48 {
  49         setup_perl_scripting();
  50         setup_python_scripting();
  51
  52         scripting_ops = &default_scripting_ops;
  53 }
  54
  55 static int cleanup_scripting(void)
  56 {
  57         pr_debug("\nperf trace script stopped\n");
  58
  59         return scripting_ops->stop_script();
  60 }
  61
  62 static char const               *input_name = "perf.data";
  63
  64 static int process_sample_event(event_t *event, struct perf_session *session)
  65 {
  66         struct sample_data data;
  67         struct thread *thread;
  68
  69         memset(&data, 0, sizeof(data));
  70         data.time = -1;
  71         data.cpu = -1;
  72         data.period = 1;
  73
  74         event__parse_sample(event, session->sample_type, &data);
  75
  76         dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld\n", event->header.misc,
  77                     data.pid, data.tid, data.ip, data.period);
  78
  79         thread = perf_session__findnew(session, event->ip.pid);
  80         if (thread == NULL) {
  81                 pr_debug("problem processing %d event, skipping it.\n",
  82                          event->header.type);
  83                 return -1;
  84         }
  85
  86         if (session->sample_type & PERF_SAMPLE_RAW) {
  87                 if (debug_mode) {
  88                         if (data.time < last_timestamp) {
  89                                 pr_err("Samples misordered, previous: %llu "
  90                                         "this: %llu\n", last_timestamp,
  91                                         data.time);
  92                                 nr_unordered++;
  93                         }
  94                         last_timestamp = data.time;
  95                         return 0;
  96                 }
  97                 /*
  98                  * FIXME: better resolve from pid from the struct trace_entry
  99                  * field, although it should be the same than this perf
 100                  * event pid
 101                  */
 102                 scripting_ops->process_event(data.cpu, data.raw_data,
 103                                              data.raw_size,
 104                                              data.time, thread->comm);
 105         }
 106
 107         session->hists.stats.total_period += data.period;
 108         return 0;
 109 }
 110
 111 static u64 nr_lost;
 112
 113 static int process_lost_event(event_t *event, struct perf_session *session __used)
 114 {
 115         nr_lost += event->lost.lost;
 116
 117         return 0;
 118 }
 119
 120 static struct perf_event_ops event_ops = {
 121         .sample = process_sample_event,
 122         .comm   = event__process_comm,
 123         .attr   = event__process_attr,
 124         .event_type = event__process_event_type,
 125         .tracing_data = event__process_tracing_data,
 126         .build_id = event__process_build_id,
 127         .lost = process_lost_event,
 128         .ordered_samples = true,
 129 };
 130
 131 extern volatile int session_done;
 132
 133 static void sig_handler(int sig __unused)
 134 {
 135         session_done = 1;
 136 }
 137
 138 static int __cmd_trace(struct perf_session *session)
 139 {
 140         int ret;
 141
 142         signal(SIGINT, sig_handler);
 143
 144         ret = perf_session__process_events(session, &event_ops);
 145
 146         if (debug_mode) {
 147                 pr_err("Misordered timestamps: %llu\n", nr_unordered);
 148                 pr_err("Lost events: %llu\n", nr_lost);
 149         }
 150
 151         return ret;
 152 }
 153
 154 struct script_spec {
 155         struct list_head        node;
 156         struct scripting_ops    *ops;
 157         char                    spec[0];
 158 };
 159
 160 LIST_HEAD(script_specs);
 161
 162 static struct script_spec *script_spec__new(const char *spec,
 163                                             struct scripting_ops *ops)
 164 {
 165         struct script_spec *s = malloc(sizeof(*s) + strlen(spec) + 1);
 166
 167         if (s != NULL) {
 168                 strcpy(s->spec, spec);
 169                 s->ops = ops;
 170         }
 171
 172         return s;
 173 }
 174
 175 static void script_spec__delete(struct script_spec *s)
 176 {
 177         free(s->spec);
 178         free(s);
 179 }
 180
 181 static void script_spec__add(struct script_spec *s)
 182 {
 183         list_add_tail(&s->node, &script_specs);
 184 }
 185
 186 static struct script_spec *script_spec__find(const char *spec)
 187 {
 188         struct script_spec *s;
 189
 190         list_for_each_entry(s, &script_specs, node)
 191                 if (strcasecmp(s->spec, spec) == 0)
 192                         return s;
 193         return NULL;
 194 }
 195
 196 static struct script_spec *script_spec__findnew(const char *spec,
 197                                                 struct scripting_ops *ops)
 198 {
 199         struct script_spec *s = script_spec__find(spec);
 200
 201         if (s)
 202                 return s;
 203
 204         s = script_spec__new(spec, ops);
 205         if (!s)
 206                 goto out_delete_spec;
 207
 208         script_spec__add(s);
 209
 210         return s;
 211
 212 out_delete_spec:
 213         script_spec__delete(s);
 214
 215         return NULL;
 216 }
 217
 218 int script_spec_register(const char *spec, struct scripting_ops *ops)
 219 {
 220         struct script_spec *s;
 221
 222         s = script_spec__find(spec);
 223         if (s)
 224                 return -1;
 225
 226         s = script_spec__findnew(spec, ops);
 227         if (!s)
 228                 return -1;
 229
 230         return 0;
 231 }
 232
 233 static struct scripting_ops *script_spec__lookup(const char *spec)
 234 {
 235         struct script_spec *s = script_spec__find(spec);
 236         if (!s)
 237                 return NULL;
 238
 239         return s->ops;
 240 }
 241
 242 static void list_available_languages(void)
 243 {
 244         struct script_spec *s;
 245
 246         fprintf(stderr, "\n");
 247         fprintf(stderr, "Scripting language extensions (used in "
 248                 "perf trace -s [spec:]script.[spec]):\n\n");
 249
 250         list_for_each_entry(s, &script_specs, node)
 251                 fprintf(stderr, "  %-42s [%s]\n", s->spec, s->ops->name);
 252
 253         fprintf(stderr, "\n");
 254 }
 255
 256 static int parse_scriptname(const struct option *opt __used,
 257                             const char *str, int unset __used)
 258 {
 259         char spec[PATH_MAX];
 260         const char *script, *ext;
 261         int len;
 262
 263         if (strcmp(str, "lang") == 0) {
 264                 list_available_languages();
 265                 exit(0);
 266         }
 267
 268         script = strchr(str, ':');
 269         if (script) {
 270                 len = script - str;
 271                 if (len >= PATH_MAX) {
 272                         fprintf(stderr, "invalid language specifier");
 273                         return -1;
 274                 }
 275                 strncpy(spec, str, len);
 276                 spec[len] = '\0';
 277                 scripting_ops = script_spec__lookup(spec);
 278                 if (!scripting_ops) {
 279                         fprintf(stderr, "invalid language specifier");
 280                         return -1;
 281                 }
 282                 script++;
 283         } else {
 284                 script = str;
 285                 ext = strrchr(script, '.');
 286                 if (!ext) {
 287                         fprintf(stderr, "invalid script extension");
 288                         return -1;
 289                 }
 290                 scripting_ops = script_spec__lookup(++ext);
 291                 if (!scripting_ops) {
 292                         fprintf(stderr, "invalid script extension");
 293                         return -1;
 294                 }
 295         }
 296
 297         script_name = strdup(script);
 298
 299         return 0;
 300 }
 301
 302 #define for_each_lang(scripts_dir, lang_dirent, lang_next)              \
 303         while (!readdir_r(scripts_dir, &lang_dirent, &lang_next) &&     \
 304                lang_next)                                               \
 305                 if (lang_dirent.d_type == DT_DIR &&                     \
 306                     (strcmp(lang_dirent.d_name, ".")) &&                \
 307                     (strcmp(lang_dirent.d_name, "..")))
 308
 309 #define for_each_script(lang_dir, script_dirent, script_next)           \
 310         while (!readdir_r(lang_dir, &script_dirent, &script_next) &&    \
 311                script_next)                                             \
 312                 if (script_dirent.d_type != DT_DIR)
 313
 314
 315 #define RECORD_SUFFIX                   "-record"
 316 #define REPORT_SUFFIX                   "-report"
 317
 318 struct script_desc {
 319         struct list_head        node;
 320         char                    *name;
 321         char                    *half_liner;
 322         char                    *args;
 323 };
 324
 325 LIST_HEAD(script_descs);
 326
 327 static struct script_desc *script_desc__new(const char *name)
 328 {
 329         struct script_desc *s = zalloc(sizeof(*s));
 330
 331         if (s != NULL)
 332                 s->name = strdup(name);
 333
 334         return s;
 335 }
 336
 337 static void script_desc__delete(struct script_desc *s)
 338 {
 339         free(s->name);
 340         free(s);
 341 }
 342
 343 static void script_desc__add(struct script_desc *s)
 344 {
 345         list_add_tail(&s->node, &script_descs);
 346 }
 347
 348 static struct script_desc *script_desc__find(const char *name)
 349 {
 350         struct script_desc *s;
 351
 352         list_for_each_entry(s, &script_descs, node)
 353                 if (strcasecmp(s->name, name) == 0)
 354                         return s;
 355         return NULL;
 356 }
 357
 358 static struct script_desc *script_desc__findnew(const char *name)
 359 {
 360         struct script_desc *s = script_desc__find(name);
 361
 362         if (s)
 363                 return s;
 364
 365         s = script_desc__new(name);
 366         if (!s)
 367                 goto out_delete_desc;
 368
 369         script_desc__add(s);
 370
 371         return s;
 372
 373 out_delete_desc:
 374         script_desc__delete(s);
 375
 376         return NULL;
 377 }
 378
 379 static char *ends_with(char *str, const char *suffix)
 380 {
 381         size_t suffix_len = strlen(suffix);
 382         char *p = str;
 383
 384         if (strlen(str) > suffix_len) {
 385                 p = str + strlen(str) - suffix_len;
 386                 if (!strncmp(p, suffix, suffix_len))
 387                         return p;
 388         }
 389
 390         return NULL;
 391 }
 392
 393 static char *ltrim(char *str)
 394 {
 395         int len = strlen(str);
 396
 397         while (len && isspace(*str)) {
 398                 len--;
 399                 str++;
 400         }
 401
 402         return str;
 403 }
 404
 405 static int read_script_info(struct script_desc *desc, const char *filename)
 406 {
 407         char line[BUFSIZ], *p;
 408         FILE *fp;
 409
 410         fp = fopen(filename, "r");
 411         if (!fp)
 412                 return -1;
 413
 414         while (fgets(line, sizeof(line), fp)) {
 415                 p = ltrim(line);
 416                 if (strlen(p) == 0)
 417                         continue;
 418                 if (*p != '#')
 419                         continue;
 420                 p++;
 421                 if (strlen(p) && *p == '!')
 422                         continue;
 423
 424                 p = ltrim(p);
 425                 if (strlen(p) && p[strlen(p) - 1] == '\n')
 426                         p[strlen(p) - 1] = '\0';
 427
 428                 if (!strncmp(p, "description:", strlen("description:"))) {
 429                         p += strlen("description:");
 430                         desc->half_liner = strdup(ltrim(p));
 431                         continue;
 432                 }
 433
 434                 if (!strncmp(p, "args:", strlen("args:"))) {
 435                         p += strlen("args:");
 436                         desc->args = strdup(ltrim(p));
 437                         continue;
 438                 }
 439         }
 440
 441         fclose(fp);
 442
 443         return 0;
 444 }
 445
 446 static int list_available_scripts(const struct option *opt __used,
 447                                   const char *s __used, int unset __used)
 448 {
 449         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 450         char scripts_path[MAXPATHLEN];
 451         DIR *scripts_dir, *lang_dir;
 452         char script_path[MAXPATHLEN];
 453         char lang_path[MAXPATHLEN];
 454         struct script_desc *desc;
 455         char first_half[BUFSIZ];
 456         char *script_root;
 457         char *str;
 458
 459         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 460
 461         scripts_dir = opendir(scripts_path);
 462         if (!scripts_dir)
 463                 return -1;
 464
 465         for_each_lang(scripts_dir, lang_dirent, lang_next) {
 466                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 467                          lang_dirent.d_name);
 468                 lang_dir = opendir(lang_path);
 469                 if (!lang_dir)
 470                         continue;
 471
 472                 for_each_script(lang_dir, script_dirent, script_next) {
 473                         script_root = strdup(script_dirent.d_name);
 474                         str = ends_with(script_root, REPORT_SUFFIX);
 475                         if (str) {
 476                                 *str = '\0';
 477                                 desc = script_desc__findnew(script_root);
 478                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 479                                          lang_path, script_dirent.d_name);
 480                                 read_script_info(desc, script_path);
 481                         }
 482                         free(script_root);
 483                 }
 484         }
 485
 486         fprintf(stdout, "List of available trace scripts:\n");
 487         list_for_each_entry(desc, &script_descs, node) {
 488                 sprintf(first_half, "%s %s", desc->name,
 489                         desc->args ? desc->args : "");
 490                 fprintf(stdout, "  %-36s %s\n", first_half,
 491                         desc->half_liner ? desc->half_liner : "");
 492         }
 493
 494         exit(0);
 495 }
 496
 497 static char *get_script_path(const char *script_root, const char *suffix)
 498 {
 499         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 500         char scripts_path[MAXPATHLEN];
 501         char script_path[MAXPATHLEN];
 502         DIR *scripts_dir, *lang_dir;
 503         char lang_path[MAXPATHLEN];
 504         char *str, *__script_root;
 505         char *path = NULL;
 506
 507         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 508
 509         scripts_dir = opendir(scripts_path);
 510         if (!scripts_dir)
 511                 return NULL;
 512
 513         for_each_lang(scripts_dir, lang_dirent, lang_next) {
 514                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 515                          lang_dirent.d_name);
 516                 lang_dir = opendir(lang_path);
 517                 if (!lang_dir)
 518                         continue;
 519
 520                 for_each_script(lang_dir, script_dirent, script_next) {
 521                         __script_root = strdup(script_dirent.d_name);
 522                         str = ends_with(__script_root, suffix);
 523                         if (str) {
 524                                 *str = '\0';
 525                                 if (strcmp(__script_root, script_root))
 526                                         continue;
 527                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 528                                          lang_path, script_dirent.d_name);
 529                                 path = strdup(script_path);
 530                                 free(__script_root);
 531                                 break;
 532                         }
 533                         free(__script_root);
 534                 }
 535         }
 536
 537         return path;
 538 }
 539
 540 static const char * const trace_usage[] = {
 541         "perf trace [<options>] <command>",
 542         NULL
 543 };
 544
 545 static const struct option options[] = {
 546         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 547                     "dump raw trace in ASCII"),
 548         OPT_INCR('v', "verbose", &verbose,
 549                     "be more verbose (show symbol address, etc)"),
 550         OPT_BOOLEAN('L', "Latency", &latency_format,
 551                     "show latency attributes (irqs/preemption disabled, etc)"),
 552         OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",
 553                            list_available_scripts),
 554         OPT_CALLBACK('s', "script", NULL, "name",
 555                      "script file name (lang:script name, script name, or *)",
 556                      parse_scriptname),
 557         OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
 558                    "generate perf-trace.xx script in specified language"),
 559         OPT_STRING('i', "input", &input_name, "file",
 560                     "input file name"),
 561         OPT_BOOLEAN('d', "debug-mode", &debug_mode,
 562                    "do various checks like samples ordering and lost events"),
 563
 564         OPT_END()
 565 };
 566
 567 int cmd_trace(int argc, const char **argv, const char *prefix __used)
 568 {
 569         struct perf_session *session;
 570         const char *suffix = NULL;
 571         const char **__argv;
 572         char *script_path;
 573         int i, err;
 574
 575         if (argc >= 2 && strncmp(argv[1], "rec", strlen("rec")) == 0) {
 576                 if (argc < 3) {
 577                         fprintf(stderr,
 578                                 "Please specify a record script\n");
 579                         return -1;
 580                 }
 581                 suffix = RECORD_SUFFIX;
 582         }
 583
 584         if (argc >= 2 && strncmp(argv[1], "rep", strlen("rep")) == 0) {
 585                 if (argc < 3) {
 586                         fprintf(stderr,
 587                                 "Please specify a report script\n");
 588                         return -1;
 589                 }
 590                 suffix = REPORT_SUFFIX;
 591         }
 592
 593         /* make sure PERF_EXEC_PATH is set for scripts */
 594         perf_set_argv_exec_path(perf_exec_path());
 595
 596         if (!suffix && argc >= 2 && strncmp(argv[1], "-", strlen("-")) != 0) {
 597                 char *record_script_path, *report_script_path;
 598                 int live_pipe[2];
 599                 pid_t pid;
 600
 601                 record_script_path = get_script_path(argv[1], RECORD_SUFFIX);
 602                 if (!record_script_path) {
 603                         fprintf(stderr, "record script not found\n");
 604                         return -1;
 605                 }
 606
 607                 report_script_path = get_script_path(argv[1], REPORT_SUFFIX);
 608                 if (!report_script_path) {
 609                         fprintf(stderr, "report script not found\n");
 610                         return -1;
 611                 }
 612
 613                 if (pipe(live_pipe) < 0) {
 614                         perror("failed to create pipe");
 615                         exit(-1);
 616                 }
 617
 618                 pid = fork();
 619                 if (pid < 0) {
 620                         perror("failed to fork");
 621                         exit(-1);
 622                 }
 623
 624                 if (!pid) {
 625                         dup2(live_pipe[1], 1);
 626                         close(live_pipe[0]);
 627
 628                         __argv = malloc(5 * sizeof(const char *));
 629                         __argv[0] = "/bin/sh";
 630                         __argv[1] = record_script_path;
 631                         __argv[2] = "-o";
 632                         __argv[3] = "-";
 633                         __argv[4] = NULL;
 634
 635                         execvp("/bin/sh", (char **)__argv);
 636                         exit(-1);
 637                 }
 638
 639                 dup2(live_pipe[0], 0);
 640                 close(live_pipe[1]);
 641
 642                 __argv = malloc((argc + 3) * sizeof(const char *));
 643                 __argv[0] = "/bin/sh";
 644                 __argv[1] = report_script_path;
 645                 for (i = 2; i < argc; i++)
 646                         __argv[i] = argv[i];
 647                 __argv[i++] = "-i";
 648                 __argv[i++] = "-";
 649                 __argv[i++] = NULL;
 650
 651                 execvp("/bin/sh", (char **)__argv);
 652                 exit(-1);
 653         }
 654
 655         if (suffix) {
 656                 script_path = get_script_path(argv[2], suffix);
 657                 if (!script_path) {
 658                         fprintf(stderr, "script not found\n");
 659                         return -1;
 660                 }
 661
 662                 __argv = malloc((argc + 1) * sizeof(const char *));
 663                 __argv[0] = "/bin/sh";
 664                 __argv[1] = script_path;
 665                 for (i = 3; i < argc; i++)
 666                         __argv[i - 1] = argv[i];
 667                 __argv[argc - 1] = NULL;
 668
 669                 execvp("/bin/sh", (char **)__argv);
 670                 exit(-1);
 671         }
 672
 673         setup_scripting();
 674
 675         argc = parse_options(argc, argv, options, trace_usage,
 676                              PARSE_OPT_STOP_AT_NON_OPTION);
 677
 678         if (symbol__init() < 0)
 679                 return -1;
 680         if (!script_name)
 681                 setup_pager();
 682
 683         session = perf_session__new(input_name, O_RDONLY, 0, false);
 684         if (session == NULL)
 685                 return -ENOMEM;
 686
 687         if (strcmp(input_name, "-") &&
 688             !perf_session__has_traces(session, "record -R"))
 689                 return -EINVAL;
 690
 691         if (generate_script_lang) {
 692                 struct stat perf_stat;
 693
 694                 int input = open(input_name, O_RDONLY);
 695                 if (input < 0) {
 696                         perror("failed to open file");
 697                         exit(-1);
 698                 }
 699
 700                 err = fstat(input, &perf_stat);
 701                 if (err < 0) {
 702                         perror("failed to stat file");
 703                         exit(-1);
 704                 }
 705
 706                 if (!perf_stat.st_size) {
 707                         fprintf(stderr, "zero-sized file, nothing to do!\n");
 708                         exit(0);
 709                 }
 710
 711                 scripting_ops = script_spec__lookup(generate_script_lang);
 712                 if (!scripting_ops) {
 713                         fprintf(stderr, "invalid language specifier");
 714                         return -1;
 715                 }
 716
 717                 err = scripting_ops->generate_script("perf-trace");
 718                 goto out;
 719         }
 720
 721         if (script_name) {
 722                 err = scripting_ops->start_script(script_name, argc, argv);
 723                 if (err)
 724                         goto out;
 725                 pr_debug("perf trace started with script %s\n\n", script_name);
 726         }
 727
 728         err = __cmd_trace(session);
 729
 730         perf_session__delete(session);
 731         cleanup_scripting();
 732 out:
 733         return err;
 734 }