tools/perf/util/scripting-engines/trace-event-perl.c

   1 /*
   2  * trace-event-perl.  Feed perf script events to an embedded Perl interpreter.
   3  *
   4  * Copyright (C) 2009 Tom Zanussi <[email protected]>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <ctype.h>
  26 #include <errno.h>
  27
  28 #include "../util.h"
  29 #include <EXTERN.h>
  30 #include <perl.h>
  31
  32 #include "../../perf.h"
  33 #include "../thread.h"
  34 #include "../event.h"
  35 #include "../trace-event.h"
  36 #include "../evsel.h"
  37
  38 void boot_Perf__Trace__Context(pTHX_ CV *cv);
  39 void boot_DynaLoader(pTHX_ CV *cv);
  40 typedef PerlInterpreter * INTERP;
  41
  42 void xs_init(pTHX);
  43
  44 void xs_init(pTHX)
  45 {
  46         const char *file = __FILE__;
  47         dXSUB_SYS;
  48
  49         newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
  50               file);
  51         newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
  52 }
  53
  54 INTERP my_perl;
  55
  56 #define FTRACE_MAX_EVENT                                \
  57         ((1 << (sizeof(unsigned short) * 8)) - 1)
  58
  59 struct event_format *events[FTRACE_MAX_EVENT];
  60
  61 extern struct scripting_context *scripting_context;
  62
  63 static char *cur_field_name;
  64 static int zero_flag_atom;
  65
  66 static void define_symbolic_value(const char *ev_name,
  67                                   const char *field_name,
  68                                   const char *field_value,
  69                                   const char *field_str)
  70 {
  71         unsigned long long value;
  72         dSP;
  73
  74         value = eval_flag(field_value);
  75
  76         ENTER;
  77         SAVETMPS;
  78         PUSHMARK(SP);
  79
  80         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
  81         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
  82         XPUSHs(sv_2mortal(newSVuv(value)));
  83         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
  84
  85         PUTBACK;
  86         if (get_cv("main::define_symbolic_value", 0))
  87                 call_pv("main::define_symbolic_value", G_SCALAR);
  88         SPAGAIN;
  89         PUTBACK;
  90         FREETMPS;
  91         LEAVE;
  92 }
  93
  94 static void define_symbolic_values(struct print_flag_sym *field,
  95                                    const char *ev_name,
  96                                    const char *field_name)
  97 {
  98         define_symbolic_value(ev_name, field_name, field->value, field->str);
  99         if (field->next)
 100                 define_symbolic_values(field->next, ev_name, field_name);
 101 }
 102
 103 static void define_symbolic_field(const char *ev_name,
 104                                   const char *field_name)
 105 {
 106         dSP;
 107
 108         ENTER;
 109         SAVETMPS;
 110         PUSHMARK(SP);
 111
 112         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 113         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 114
 115         PUTBACK;
 116         if (get_cv("main::define_symbolic_field", 0))
 117                 call_pv("main::define_symbolic_field", G_SCALAR);
 118         SPAGAIN;
 119         PUTBACK;
 120         FREETMPS;
 121         LEAVE;
 122 }
 123
 124 static void define_flag_value(const char *ev_name,
 125                               const char *field_name,
 126                               const char *field_value,
 127                               const char *field_str)
 128 {
 129         unsigned long long value;
 130         dSP;
 131
 132         value = eval_flag(field_value);
 133
 134         ENTER;
 135         SAVETMPS;
 136         PUSHMARK(SP);
 137
 138         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 139         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 140         XPUSHs(sv_2mortal(newSVuv(value)));
 141         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
 142
 143         PUTBACK;
 144         if (get_cv("main::define_flag_value", 0))
 145                 call_pv("main::define_flag_value", G_SCALAR);
 146         SPAGAIN;
 147         PUTBACK;
 148         FREETMPS;
 149         LEAVE;
 150 }
 151
 152 static void define_flag_values(struct print_flag_sym *field,
 153                                const char *ev_name,
 154                                const char *field_name)
 155 {
 156         define_flag_value(ev_name, field_name, field->value, field->str);
 157         if (field->next)
 158                 define_flag_values(field->next, ev_name, field_name);
 159 }
 160
 161 static void define_flag_field(const char *ev_name,
 162                               const char *field_name,
 163                               const char *delim)
 164 {
 165         dSP;
 166
 167         ENTER;
 168         SAVETMPS;
 169         PUSHMARK(SP);
 170
 171         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 172         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 173         XPUSHs(sv_2mortal(newSVpv(delim, 0)));
 174
 175         PUTBACK;
 176         if (get_cv("main::define_flag_field", 0))
 177                 call_pv("main::define_flag_field", G_SCALAR);
 178         SPAGAIN;
 179         PUTBACK;
 180         FREETMPS;
 181         LEAVE;
 182 }
 183
 184 static void define_event_symbols(struct event_format *event,
 185                                  const char *ev_name,
 186                                  struct print_arg *args)
 187 {
 188         switch (args->type) {
 189         case PRINT_NULL:
 190                 break;
 191         case PRINT_ATOM:
 192                 define_flag_value(ev_name, cur_field_name, "0",
 193                                   args->atom.atom);
 194                 zero_flag_atom = 0;
 195                 break;
 196         case PRINT_FIELD:
 197                 free(cur_field_name);
 198                 cur_field_name = strdup(args->field.name);
 199                 break;
 200         case PRINT_FLAGS:
 201                 define_event_symbols(event, ev_name, args->flags.field);
 202                 define_flag_field(ev_name, cur_field_name, args->flags.delim);
 203                 define_flag_values(args->flags.flags, ev_name, cur_field_name);
 204                 break;
 205         case PRINT_SYMBOL:
 206                 define_event_symbols(event, ev_name, args->symbol.field);
 207                 define_symbolic_field(ev_name, cur_field_name);
 208                 define_symbolic_values(args->symbol.symbols, ev_name,
 209                                        cur_field_name);
 210                 break;
 211         case PRINT_HEX:
 212                 define_event_symbols(event, ev_name, args->hex.field);
 213                 define_event_symbols(event, ev_name, args->hex.size);
 214                 break;
 215         case PRINT_BSTRING:
 216         case PRINT_DYNAMIC_ARRAY:
 217         case PRINT_STRING:
 218                 break;
 219         case PRINT_TYPE:
 220                 define_event_symbols(event, ev_name, args->typecast.item);
 221                 break;
 222         case PRINT_OP:
 223                 if (strcmp(args->op.op, ":") == 0)
 224                         zero_flag_atom = 1;
 225                 define_event_symbols(event, ev_name, args->op.left);
 226                 define_event_symbols(event, ev_name, args->op.right);
 227                 break;
 228         case PRINT_FUNC:
 229         default:
 230                 pr_err("Unsupported print arg type\n");
 231                 /* we should warn... */
 232                 return;
 233         }
 234
 235         if (args->next)
 236                 define_event_symbols(event, ev_name, args->next);
 237 }
 238
 239 static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 240 {
 241         static char ev_name[256];
 242         struct event_format *event;
 243         int type = evsel->attr.config;
 244
 245         if (events[type])
 246                 return events[type];
 247
 248         events[type] = event = evsel->tp_format;
 249         if (!event)
 250                 return NULL;
 251
 252         sprintf(ev_name, "%s::%s", event->system, event->name);
 253
 254         define_event_symbols(event, ev_name, event->print_fmt.args);
 255
 256         return event;
 257 }
 258
 259 static void perl_process_tracepoint(struct perf_sample *sample,
 260                                     struct perf_evsel *evsel,
 261                                     struct thread *thread)
 262 {
 263         struct format_field *field;
 264         static char handler[256];
 265         unsigned long long val;
 266         unsigned long s, ns;
 267         struct event_format *event;
 268         int pid;
 269         int cpu = sample->cpu;
 270         void *data = sample->raw_data;
 271         unsigned long long nsecs = sample->time;
 272         const char *comm = thread__comm_str(thread);
 273
 274         dSP;
 275
 276         if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
 277                 return;
 278
 279         event = find_cache_event(evsel);
 280         if (!event)
 281                 die("ug! no event found for type %" PRIu64, (u64)evsel->attr.config);
 282
 283         pid = raw_field_value(event, "common_pid", data);
 284
 285         sprintf(handler, "%s::%s", event->system, event->name);
 286
 287         s = nsecs / NSECS_PER_SEC;
 288         ns = nsecs - s * NSECS_PER_SEC;
 289
 290         scripting_context->event_data = data;
 291         scripting_context->pevent = evsel->tp_format->pevent;
 292
 293         ENTER;
 294         SAVETMPS;
 295         PUSHMARK(SP);
 296
 297         XPUSHs(sv_2mortal(newSVpv(handler, 0)));
 298         XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
 299         XPUSHs(sv_2mortal(newSVuv(cpu)));
 300         XPUSHs(sv_2mortal(newSVuv(s)));
 301         XPUSHs(sv_2mortal(newSVuv(ns)));
 302         XPUSHs(sv_2mortal(newSViv(pid)));
 303         XPUSHs(sv_2mortal(newSVpv(comm, 0)));
 304
 305         /* common fields other than pid can be accessed via xsub fns */
 306
 307         for (field = event->format.fields; field; field = field->next) {
 308                 if (field->flags & FIELD_IS_STRING) {
 309                         int offset;
 310                         if (field->flags & FIELD_IS_DYNAMIC) {
 311                                 offset = *(int *)(data + field->offset);
 312                                 offset &= 0xffff;
 313                         } else
 314                                 offset = field->offset;
 315                         XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
 316                 } else { /* FIELD_IS_NUMERIC */
 317                         val = read_size(event, data + field->offset,
 318                                         field->size);
 319                         if (field->flags & FIELD_IS_SIGNED) {
 320                                 XPUSHs(sv_2mortal(newSViv(val)));
 321                         } else {
 322                                 XPUSHs(sv_2mortal(newSVuv(val)));
 323                         }
 324                 }
 325         }
 326
 327         PUTBACK;
 328
 329         if (get_cv(handler, 0))
 330                 call_pv(handler, G_SCALAR);
 331         else if (get_cv("main::trace_unhandled", 0)) {
 332                 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
 333                 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
 334                 XPUSHs(sv_2mortal(newSVuv(cpu)));
 335                 XPUSHs(sv_2mortal(newSVuv(nsecs)));
 336                 XPUSHs(sv_2mortal(newSViv(pid)));
 337                 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
 338                 call_pv("main::trace_unhandled", G_SCALAR);
 339         }
 340         SPAGAIN;
 341         PUTBACK;
 342         FREETMPS;
 343         LEAVE;
 344 }
 345
 346 static void perl_process_event_generic(union perf_event *event,
 347                                        struct perf_sample *sample,
 348                                        struct perf_evsel *evsel)
 349 {
 350         dSP;
 351
 352         if (!get_cv("process_event", 0))
 353                 return;
 354
 355         ENTER;
 356         SAVETMPS;
 357         PUSHMARK(SP);
 358         XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
 359         XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->attr, sizeof(evsel->attr))));
 360         XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
 361         XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
 362         PUTBACK;
 363         call_pv("process_event", G_SCALAR);
 364         SPAGAIN;
 365         PUTBACK;
 366         FREETMPS;
 367         LEAVE;
 368 }
 369
 370 static void perl_process_event(union perf_event *event,
 371                                struct perf_sample *sample,
 372                                struct perf_evsel *evsel,
 373                                struct thread *thread,
 374                                struct addr_location *al __maybe_unused)
 375 {
 376         perl_process_tracepoint(sample, evsel, thread);
 377         perl_process_event_generic(event, sample, evsel);
 378 }
 379
 380 static void run_start_sub(void)
 381 {
 382         dSP; /* access to Perl stack */
 383         PUSHMARK(SP);
 384
 385         if (get_cv("main::trace_begin", 0))
 386                 call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
 387 }
 388
 389 /*
 390  * Start trace script
 391  */
 392 static int perl_start_script(const char *script, int argc, const char **argv)
 393 {
 394         const char **command_line;
 395         int i, err = 0;
 396
 397         command_line = malloc((argc + 2) * sizeof(const char *));
 398         command_line[0] = "";
 399         command_line[1] = script;
 400         for (i = 2; i < argc + 2; i++)
 401                 command_line[i] = argv[i - 2];
 402
 403         my_perl = perl_alloc();
 404         perl_construct(my_perl);
 405
 406         if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
 407                        (char **)NULL)) {
 408                 err = -1;
 409                 goto error;
 410         }
 411
 412         if (perl_run(my_perl)) {
 413                 err = -1;
 414                 goto error;
 415         }
 416
 417         if (SvTRUE(ERRSV)) {
 418                 err = -1;
 419                 goto error;
 420         }
 421
 422         run_start_sub();
 423
 424         free(command_line);
 425         return 0;
 426 error:
 427         perl_free(my_perl);
 428         free(command_line);
 429
 430         return err;
 431 }
 432
 433 /*
 434  * Stop trace script
 435  */
 436 static int perl_stop_script(void)
 437 {
 438         dSP; /* access to Perl stack */
 439         PUSHMARK(SP);
 440
 441         if (get_cv("main::trace_end", 0))
 442                 call_pv("main::trace_end", G_DISCARD | G_NOARGS);
 443
 444         perl_destruct(my_perl);
 445         perl_free(my_perl);
 446
 447         return 0;
 448 }
 449
 450 static int perl_generate_script(struct pevent *pevent, const char *outfile)
 451 {
 452         struct event_format *event = NULL;
 453         struct format_field *f;
 454         char fname[PATH_MAX];
 455         int not_first, count;
 456         FILE *ofp;
 457
 458         sprintf(fname, "%s.pl", outfile);
 459         ofp = fopen(fname, "w");
 460         if (ofp == NULL) {
 461                 fprintf(stderr, "couldn't open %s\n", fname);
 462                 return -1;
 463         }
 464
 465         fprintf(ofp, "# perf script event handlers, "
 466                 "generated by perf script -g perl\n");
 467
 468         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 469                 " License version 2\n\n");
 470
 471         fprintf(ofp, "# The common_* event handler fields are the most useful "
 472                 "fields common to\n");
 473
 474         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 475                 "the 'common_*' fields\n");
 476
 477         fprintf(ofp, "# in the format files.  Those fields not available as "
 478                 "handler params can\n");
 479
 480         fprintf(ofp, "# be retrieved using Perl functions of the form "
 481                 "common_*($context).\n");
 482
 483         fprintf(ofp, "# See Context.pm for the list of available "
 484                 "functions.\n\n");
 485
 486         fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
 487                 "Perf-Trace-Util/lib\";\n");
 488
 489         fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
 490         fprintf(ofp, "use Perf::Trace::Core;\n");
 491         fprintf(ofp, "use Perf::Trace::Context;\n");
 492         fprintf(ofp, "use Perf::Trace::Util;\n\n");
 493
 494         fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
 495         fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n\n");
 496
 497         while ((event = trace_find_next_event(pevent, event))) {
 498                 fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
 499                 fprintf(ofp, "\tmy (");
 500
 501                 fprintf(ofp, "$event_name, ");
 502                 fprintf(ofp, "$context, ");
 503                 fprintf(ofp, "$common_cpu, ");
 504                 fprintf(ofp, "$common_secs, ");
 505                 fprintf(ofp, "$common_nsecs,\n");
 506                 fprintf(ofp, "\t    $common_pid, ");
 507                 fprintf(ofp, "$common_comm,\n\t    ");
 508
 509                 not_first = 0;
 510                 count = 0;
 511
 512                 for (f = event->format.fields; f; f = f->next) {
 513                         if (not_first++)
 514                                 fprintf(ofp, ", ");
 515                         if (++count % 5 == 0)
 516                                 fprintf(ofp, "\n\t    ");
 517
 518                         fprintf(ofp, "$%s", f->name);
 519                 }
 520                 fprintf(ofp, ") = @_;\n\n");
 521
 522                 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 523                         "$common_secs, $common_nsecs,\n\t             "
 524                         "$common_pid, $common_comm);\n\n");
 525
 526                 fprintf(ofp, "\tprintf(\"");
 527
 528                 not_first = 0;
 529                 count = 0;
 530
 531                 for (f = event->format.fields; f; f = f->next) {
 532                         if (not_first++)
 533                                 fprintf(ofp, ", ");
 534                         if (count && count % 4 == 0) {
 535                                 fprintf(ofp, "\".\n\t       \"");
 536                         }
 537                         count++;
 538
 539                         fprintf(ofp, "%s=", f->name);
 540                         if (f->flags & FIELD_IS_STRING ||
 541                             f->flags & FIELD_IS_FLAG ||
 542                             f->flags & FIELD_IS_SYMBOLIC)
 543                                 fprintf(ofp, "%%s");
 544                         else if (f->flags & FIELD_IS_SIGNED)
 545                                 fprintf(ofp, "%%d");
 546                         else
 547                                 fprintf(ofp, "%%u");
 548                 }
 549
 550                 fprintf(ofp, "\\n\",\n\t       ");
 551
 552                 not_first = 0;
 553                 count = 0;
 554
 555                 for (f = event->format.fields; f; f = f->next) {
 556                         if (not_first++)
 557                                 fprintf(ofp, ", ");
 558
 559                         if (++count % 5 == 0)
 560                                 fprintf(ofp, "\n\t       ");
 561
 562                         if (f->flags & FIELD_IS_FLAG) {
 563                                 if ((count - 1) % 5 != 0) {
 564                                         fprintf(ofp, "\n\t       ");
 565                                         count = 4;
 566                                 }
 567                                 fprintf(ofp, "flag_str(\"");
 568                                 fprintf(ofp, "%s::%s\", ", event->system,
 569                                         event->name);
 570                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 571                                         f->name);
 572                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 573                                 if ((count - 1) % 5 != 0) {
 574                                         fprintf(ofp, "\n\t       ");
 575                                         count = 4;
 576                                 }
 577                                 fprintf(ofp, "symbol_str(\"");
 578                                 fprintf(ofp, "%s::%s\", ", event->system,
 579                                         event->name);
 580                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 581                                         f->name);
 582                         } else
 583                                 fprintf(ofp, "$%s", f->name);
 584                 }
 585
 586                 fprintf(ofp, ");\n");
 587                 fprintf(ofp, "}\n\n");
 588         }
 589
 590         fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
 591                 "$common_cpu, $common_secs, $common_nsecs,\n\t    "
 592                 "$common_pid, $common_comm) = @_;\n\n");
 593
 594         fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 595                 "$common_secs, $common_nsecs,\n\t             $common_pid, "
 596                 "$common_comm);\n}\n\n");
 597
 598         fprintf(ofp, "sub print_header\n{\n"
 599                 "\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
 600                 "\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
 601                 "$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
 602
 603         fprintf(ofp,
 604                 "\n# Packed byte string args of process_event():\n"
 605                 "#\n"
 606                 "# $event:\tunion perf_event\tutil/event.h\n"
 607                 "# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
 608                 "# $sample:\tstruct perf_sample\tutil/event.h\n"
 609                 "# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
 610                 "\n"
 611                 "sub process_event\n"
 612                 "{\n"
 613                 "\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
 614                 "\n"
 615                 "\tmy @event\t= unpack(\"LSS\", $event);\n"
 616                 "\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
 617                 "\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
 618                 "\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
 619                 "\n"
 620                 "\tuse Data::Dumper;\n"
 621                 "\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
 622                 "}\n");
 623
 624         fclose(ofp);
 625
 626         fprintf(stderr, "generated Perl script: %s\n", fname);
 627
 628         return 0;
 629 }
 630
 631 struct scripting_ops perl_scripting_ops = {
 632         .name = "Perl",
 633         .start_script = perl_start_script,
 634         .stop_script = perl_stop_script,
 635         .process_event = perl_process_event,
 636         .generate_script = perl_generate_script,
 637 };