tools/perf/util/header.c

   1 #include "util.h"
   2 #include <sys/types.h>
   3 #include <byteswap.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <linux/list.h>
   8 #include <linux/kernel.h>
   9 #include <linux/bitops.h>
  10 #include <sys/utsname.h>
  11
  12 #include "evlist.h"
  13 #include "evsel.h"
  14 #include "header.h"
  15 #include "../perf.h"
  16 #include "trace-event.h"
  17 #include "session.h"
  18 #include "symbol.h"
  19 #include "debug.h"
  20 #include "cpumap.h"
  21 #include "pmu.h"
  22 #include "vdso.h"
  23 #include "strbuf.h"
  24 #include "build-id.h"
  25 #include "data.h"
  26
  27 static bool no_buildid_cache = false;
  28
  29 static u32 header_argc;
  30 static const char **header_argv;
  31
  32 /*
  33  * magic2 = "PERFILE2"
  34  * must be a numerical value to let the endianness
  35  * determine the memory layout. That way we are able
  36  * to detect endianness when reading the perf.data file
  37  * back.
  38  *
  39  * we check for legacy (PERFFILE) format.
  40  */
  41 static const char *__perf_magic1 = "PERFFILE";
  42 static const u64 __perf_magic2    = 0x32454c4946524550ULL;
  43 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
  44
  45 #define PERF_MAGIC      __perf_magic2
  46
  47 struct perf_file_attr {
  48         struct perf_event_attr  attr;
  49         struct perf_file_section        ids;
  50 };
  51
  52 void perf_header__set_feat(struct perf_header *header, int feat)
  53 {
  54         set_bit(feat, header->adds_features);
  55 }
  56
  57 void perf_header__clear_feat(struct perf_header *header, int feat)
  58 {
  59         clear_bit(feat, header->adds_features);
  60 }
  61
  62 bool perf_header__has_feat(const struct perf_header *header, int feat)
  63 {
  64         return test_bit(feat, header->adds_features);
  65 }
  66
  67 static int do_write(int fd, const void *buf, size_t size)
  68 {
  69         while (size) {
  70                 int ret = write(fd, buf, size);
  71
  72                 if (ret < 0)
  73                         return -errno;
  74
  75                 size -= ret;
  76                 buf += ret;
  77         }
  78
  79         return 0;
  80 }
  81
  82 #define NAME_ALIGN 64
  83
  84 static int write_padded(int fd, const void *bf, size_t count,
  85                         size_t count_aligned)
  86 {
  87         static const char zero_buf[NAME_ALIGN];
  88         int err = do_write(fd, bf, count);
  89
  90         if (!err)
  91                 err = do_write(fd, zero_buf, count_aligned - count);
  92
  93         return err;
  94 }
  95
  96 static int do_write_string(int fd, const char *str)
  97 {
  98         u32 len, olen;
  99         int ret;
 100
 101         olen = strlen(str) + 1;
 102         len = PERF_ALIGN(olen, NAME_ALIGN);
 103
 104         /* write len, incl. \0 */
 105         ret = do_write(fd, &len, sizeof(len));
 106         if (ret < 0)
 107                 return ret;
 108
 109         return write_padded(fd, str, olen, len);
 110 }
 111
 112 static char *do_read_string(int fd, struct perf_header *ph)
 113 {
 114         ssize_t sz, ret;
 115         u32 len;
 116         char *buf;
 117
 118         sz = readn(fd, &len, sizeof(len));
 119         if (sz < (ssize_t)sizeof(len))
 120                 return NULL;
 121
 122         if (ph->needs_swap)
 123                 len = bswap_32(len);
 124
 125         buf = malloc(len);
 126         if (!buf)
 127                 return NULL;
 128
 129         ret = readn(fd, buf, len);
 130         if (ret == (ssize_t)len) {
 131                 /*
 132                  * strings are padded by zeroes
 133                  * thus the actual strlen of buf
 134                  * may be less than len
 135                  */
 136                 return buf;
 137         }
 138
 139         free(buf);
 140         return NULL;
 141 }
 142
 143 int
 144 perf_header__set_cmdline(int argc, const char **argv)
 145 {
 146         int i;
 147
 148         /*
 149          * If header_argv has already been set, do not override it.
 150          * This allows a command to set the cmdline, parse args and
 151          * then call another builtin function that implements a
 152          * command -- e.g, cmd_kvm calling cmd_record.
 153          */
 154         if (header_argv)
 155                 return 0;
 156
 157         header_argc = (u32)argc;
 158
 159         /* do not include NULL termination */
 160         header_argv = calloc(argc, sizeof(char *));
 161         if (!header_argv)
 162                 return -ENOMEM;
 163
 164         /*
 165          * must copy argv contents because it gets moved
 166          * around during option parsing
 167          */
 168         for (i = 0; i < argc ; i++)
 169                 header_argv[i] = argv[i];
 170
 171         return 0;
 172 }
 173
 174 #define dsos__for_each_with_build_id(pos, head) \
 175         list_for_each_entry(pos, head, node)    \
 176                 if (!pos->has_build_id)         \
 177                         continue;               \
 178                 else
 179
 180 static int write_buildid(const char *name, size_t name_len, u8 *build_id,
 181                          pid_t pid, u16 misc, int fd)
 182 {
 183         int err;
 184         struct build_id_event b;
 185         size_t len;
 186
 187         len = name_len + 1;
 188         len = PERF_ALIGN(len, NAME_ALIGN);
 189
 190         memset(&b, 0, sizeof(b));
 191         memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
 192         b.pid = pid;
 193         b.header.misc = misc;
 194         b.header.size = sizeof(b) + len;
 195
 196         err = do_write(fd, &b, sizeof(b));
 197         if (err < 0)
 198                 return err;
 199
 200         return write_padded(fd, name, name_len + 1, len);
 201 }
 202
 203 static int __dsos__hit_all(struct list_head *head)
 204 {
 205         struct dso *pos;
 206
 207         list_for_each_entry(pos, head, node)
 208                 pos->hit = true;
 209
 210         return 0;
 211 }
 212
 213 static int machine__hit_all_dsos(struct machine *machine)
 214 {
 215         int err;
 216
 217         err = __dsos__hit_all(&machine->kernel_dsos.head);
 218         if (err)
 219                 return err;
 220
 221         return __dsos__hit_all(&machine->user_dsos.head);
 222 }
 223
 224 int dsos__hit_all(struct perf_session *session)
 225 {
 226         struct rb_node *nd;
 227         int err;
 228
 229         err = machine__hit_all_dsos(&session->machines.host);
 230         if (err)
 231                 return err;
 232
 233         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
 234                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 235
 236                 err = machine__hit_all_dsos(pos);
 237                 if (err)
 238                         return err;
 239         }
 240
 241         return 0;
 242 }
 243
 244 static int __dsos__write_buildid_table(struct list_head *head,
 245                                        struct machine *machine,
 246                                        pid_t pid, u16 misc, int fd)
 247 {
 248         char nm[PATH_MAX];
 249         struct dso *pos;
 250
 251         dsos__for_each_with_build_id(pos, head) {
 252                 int err;
 253                 const char *name;
 254                 size_t name_len;
 255
 256                 if (!pos->hit)
 257                         continue;
 258
 259                 if (dso__is_vdso(pos)) {
 260                         name = pos->short_name;
 261                         name_len = pos->short_name_len + 1;
 262                 } else if (dso__is_kcore(pos)) {
 263                         machine__mmap_name(machine, nm, sizeof(nm));
 264                         name = nm;
 265                         name_len = strlen(nm) + 1;
 266                 } else {
 267                         name = pos->long_name;
 268                         name_len = pos->long_name_len + 1;
 269                 }
 270
 271                 err = write_buildid(name, name_len, pos->build_id,
 272                                     pid, misc, fd);
 273                 if (err)
 274                         return err;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int machine__write_buildid_table(struct machine *machine, int fd)
 281 {
 282         int err;
 283         u16 kmisc = PERF_RECORD_MISC_KERNEL,
 284             umisc = PERF_RECORD_MISC_USER;
 285
 286         if (!machine__is_host(machine)) {
 287                 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
 288                 umisc = PERF_RECORD_MISC_GUEST_USER;
 289         }
 290
 291         err = __dsos__write_buildid_table(&machine->kernel_dsos.head, machine,
 292                                           machine->pid, kmisc, fd);
 293         if (err == 0)
 294                 err = __dsos__write_buildid_table(&machine->user_dsos.head,
 295                                                   machine, machine->pid, umisc,
 296                                                   fd);
 297         return err;
 298 }
 299
 300 static int dsos__write_buildid_table(struct perf_header *header, int fd)
 301 {
 302         struct perf_session *session = container_of(header,
 303                         struct perf_session, header);
 304         struct rb_node *nd;
 305         int err = machine__write_buildid_table(&session->machines.host, fd);
 306
 307         if (err)
 308                 return err;
 309
 310         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
 311                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 312                 err = machine__write_buildid_table(pos, fd);
 313                 if (err)
 314                         break;
 315         }
 316         return err;
 317 }
 318
 319 int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
 320                           const char *name, bool is_kallsyms, bool is_vdso)
 321 {
 322         const size_t size = PATH_MAX;
 323         char *realname, *filename = zalloc(size),
 324              *linkname = zalloc(size), *targetname;
 325         int len, err = -1;
 326         bool slash = is_kallsyms || is_vdso;
 327
 328         if (is_kallsyms) {
 329                 if (symbol_conf.kptr_restrict) {
 330                         pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
 331                         err = 0;
 332                         goto out_free;
 333                 }
 334                 realname = (char *) name;
 335         } else
 336                 realname = realpath(name, NULL);
 337
 338         if (realname == NULL || filename == NULL || linkname == NULL)
 339                 goto out_free;
 340
 341         len = scnprintf(filename, size, "%s%s%s",
 342                        debugdir, slash ? "/" : "",
 343                        is_vdso ? DSO__NAME_VDSO : realname);
 344         if (mkdir_p(filename, 0755))
 345                 goto out_free;
 346
 347         snprintf(filename + len, size - len, "/%s", sbuild_id);
 348
 349         if (access(filename, F_OK)) {
 350                 if (is_kallsyms) {
 351                          if (copyfile("/proc/kallsyms", filename))
 352                                 goto out_free;
 353                 } else if (link(realname, filename) && copyfile(name, filename))
 354                         goto out_free;
 355         }
 356
 357         len = scnprintf(linkname, size, "%s/.build-id/%.2s",
 358                        debugdir, sbuild_id);
 359
 360         if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
 361                 goto out_free;
 362
 363         snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
 364         targetname = filename + strlen(debugdir) - 5;
 365         memcpy(targetname, "../..", 5);
 366
 367         if (symlink(targetname, linkname) == 0)
 368                 err = 0;
 369 out_free:
 370         if (!is_kallsyms)
 371                 free(realname);
 372         free(filename);
 373         free(linkname);
 374         return err;
 375 }
 376
 377 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
 378                                  const char *name, const char *debugdir,
 379                                  bool is_kallsyms, bool is_vdso)
 380 {
 381         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 382
 383         build_id__sprintf(build_id, build_id_size, sbuild_id);
 384
 385         return build_id_cache__add_s(sbuild_id, debugdir, name,
 386                                      is_kallsyms, is_vdso);
 387 }
 388
 389 int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
 390 {
 391         const size_t size = PATH_MAX;
 392         char *filename = zalloc(size),
 393              *linkname = zalloc(size);
 394         int err = -1;
 395
 396         if (filename == NULL || linkname == NULL)
 397                 goto out_free;
 398
 399         snprintf(linkname, size, "%s/.build-id/%.2s/%s",
 400                  debugdir, sbuild_id, sbuild_id + 2);
 401
 402         if (access(linkname, F_OK))
 403                 goto out_free;
 404
 405         if (readlink(linkname, filename, size - 1) < 0)
 406                 goto out_free;
 407
 408         if (unlink(linkname))
 409                 goto out_free;
 410
 411         /*
 412          * Since the link is relative, we must make it absolute:
 413          */
 414         snprintf(linkname, size, "%s/.build-id/%.2s/%s",
 415                  debugdir, sbuild_id, filename);
 416
 417         if (unlink(linkname))
 418                 goto out_free;
 419
 420         err = 0;
 421 out_free:
 422         free(filename);
 423         free(linkname);
 424         return err;
 425 }
 426
 427 static int dso__cache_build_id(struct dso *dso, struct machine *machine,
 428                                const char *debugdir)
 429 {
 430         bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
 431         bool is_vdso = dso__is_vdso(dso);
 432         const char *name = dso->long_name;
 433         char nm[PATH_MAX];
 434
 435         if (dso__is_kcore(dso)) {
 436                 is_kallsyms = true;
 437                 machine__mmap_name(machine, nm, sizeof(nm));
 438                 name = nm;
 439         }
 440         return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
 441                                      debugdir, is_kallsyms, is_vdso);
 442 }
 443
 444 static int __dsos__cache_build_ids(struct list_head *head,
 445                                    struct machine *machine, const char *debugdir)
 446 {
 447         struct dso *pos;
 448         int err = 0;
 449
 450         dsos__for_each_with_build_id(pos, head)
 451                 if (dso__cache_build_id(pos, machine, debugdir))
 452                         err = -1;
 453
 454         return err;
 455 }
 456
 457 static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
 458 {
 459         int ret = __dsos__cache_build_ids(&machine->kernel_dsos.head, machine,
 460                                           debugdir);
 461         ret |= __dsos__cache_build_ids(&machine->user_dsos.head, machine,
 462                                        debugdir);
 463         return ret;
 464 }
 465
 466 static int perf_session__cache_build_ids(struct perf_session *session)
 467 {
 468         struct rb_node *nd;
 469         int ret;
 470         char debugdir[PATH_MAX];
 471
 472         snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
 473
 474         if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
 475                 return -1;
 476
 477         ret = machine__cache_build_ids(&session->machines.host, debugdir);
 478
 479         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
 480                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 481                 ret |= machine__cache_build_ids(pos, debugdir);
 482         }
 483         return ret ? -1 : 0;
 484 }
 485
 486 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
 487 {
 488         bool ret;
 489
 490         ret  = __dsos__read_build_ids(&machine->kernel_dsos.head, with_hits);
 491         ret |= __dsos__read_build_ids(&machine->user_dsos.head, with_hits);
 492         return ret;
 493 }
 494
 495 static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
 496 {
 497         struct rb_node *nd;
 498         bool ret = machine__read_build_ids(&session->machines.host, with_hits);
 499
 500         for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
 501                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 502                 ret |= machine__read_build_ids(pos, with_hits);
 503         }
 504
 505         return ret;
 506 }
 507
 508 static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
 509                             struct perf_evlist *evlist)
 510 {
 511         return read_tracing_data(fd, &evlist->entries);
 512 }
 513
 514
 515 static int write_build_id(int fd, struct perf_header *h,
 516                           struct perf_evlist *evlist __maybe_unused)
 517 {
 518         struct perf_session *session;
 519         int err;
 520
 521         session = container_of(h, struct perf_session, header);
 522
 523         if (!perf_session__read_build_ids(session, true))
 524                 return -1;
 525
 526         err = dsos__write_buildid_table(h, fd);
 527         if (err < 0) {
 528                 pr_debug("failed to write buildid table\n");
 529                 return err;
 530         }
 531         if (!no_buildid_cache)
 532                 perf_session__cache_build_ids(session);
 533
 534         return 0;
 535 }
 536
 537 static int write_hostname(int fd, struct perf_header *h __maybe_unused,
 538                           struct perf_evlist *evlist __maybe_unused)
 539 {
 540         struct utsname uts;
 541         int ret;
 542
 543         ret = uname(&uts);
 544         if (ret < 0)
 545                 return -1;
 546
 547         return do_write_string(fd, uts.nodename);
 548 }
 549
 550 static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
 551                            struct perf_evlist *evlist __maybe_unused)
 552 {
 553         struct utsname uts;
 554         int ret;
 555
 556         ret = uname(&uts);
 557         if (ret < 0)
 558                 return -1;
 559
 560         return do_write_string(fd, uts.release);
 561 }
 562
 563 static int write_arch(int fd, struct perf_header *h __maybe_unused,
 564                       struct perf_evlist *evlist __maybe_unused)
 565 {
 566         struct utsname uts;
 567         int ret;
 568
 569         ret = uname(&uts);
 570         if (ret < 0)
 571                 return -1;
 572
 573         return do_write_string(fd, uts.machine);
 574 }
 575
 576 static int write_version(int fd, struct perf_header *h __maybe_unused,
 577                          struct perf_evlist *evlist __maybe_unused)
 578 {
 579         return do_write_string(fd, perf_version_string);
 580 }
 581
 582 static int __write_cpudesc(int fd, const char *cpuinfo_proc)
 583 {
 584         FILE *file;
 585         char *buf = NULL;
 586         char *s, *p;
 587         const char *search = cpuinfo_proc;
 588         size_t len = 0;
 589         int ret = -1;
 590
 591         if (!search)
 592                 return -1;
 593
 594         file = fopen("/proc/cpuinfo", "r");
 595         if (!file)
 596                 return -1;
 597
 598         while (getline(&buf, &len, file) > 0) {
 599                 ret = strncmp(buf, search, strlen(search));
 600                 if (!ret)
 601                         break;
 602         }
 603
 604         if (ret) {
 605                 ret = -1;
 606                 goto done;
 607         }
 608
 609         s = buf;
 610
 611         p = strchr(buf, ':');
 612         if (p && *(p+1) == ' ' && *(p+2))
 613                 s = p + 2;
 614         p = strchr(s, '\n');
 615         if (p)
 616                 *p = '\0';
 617
 618         /* squash extra space characters (branding string) */
 619         p = s;
 620         while (*p) {
 621                 if (isspace(*p)) {
 622                         char *r = p + 1;
 623                         char *q = r;
 624                         *p = ' ';
 625                         while (*q && isspace(*q))
 626                                 q++;
 627                         if (q != (p+1))
 628                                 while ((*r++ = *q++));
 629                 }
 630                 p++;
 631         }
 632         ret = do_write_string(fd, s);
 633 done:
 634         free(buf);
 635         fclose(file);
 636         return ret;
 637 }
 638
 639 static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
 640                        struct perf_evlist *evlist __maybe_unused)
 641 {
 642 #ifndef CPUINFO_PROC
 643 #define CPUINFO_PROC {"model name", }
 644 #endif
 645         const char *cpuinfo_procs[] = CPUINFO_PROC;
 646         unsigned int i;
 647
 648         for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
 649                 int ret;
 650                 ret = __write_cpudesc(fd, cpuinfo_procs[i]);
 651                 if (ret >= 0)
 652                         return ret;
 653         }
 654         return -1;
 655 }
 656
 657
 658 static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
 659                         struct perf_evlist *evlist __maybe_unused)
 660 {
 661         long nr;
 662         u32 nrc, nra;
 663         int ret;
 664
 665         nr = sysconf(_SC_NPROCESSORS_CONF);
 666         if (nr < 0)
 667                 return -1;
 668
 669         nrc = (u32)(nr & UINT_MAX);
 670
 671         nr = sysconf(_SC_NPROCESSORS_ONLN);
 672         if (nr < 0)
 673                 return -1;
 674
 675         nra = (u32)(nr & UINT_MAX);
 676
 677         ret = do_write(fd, &nrc, sizeof(nrc));
 678         if (ret < 0)
 679                 return ret;
 680
 681         return do_write(fd, &nra, sizeof(nra));
 682 }
 683
 684 static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
 685                             struct perf_evlist *evlist)
 686 {
 687         struct perf_evsel *evsel;
 688         u32 nre, nri, sz;
 689         int ret;
 690
 691         nre = evlist->nr_entries;
 692
 693         /*
 694          * write number of events
 695          */
 696         ret = do_write(fd, &nre, sizeof(nre));
 697         if (ret < 0)
 698                 return ret;
 699
 700         /*
 701          * size of perf_event_attr struct
 702          */
 703         sz = (u32)sizeof(evsel->attr);
 704         ret = do_write(fd, &sz, sizeof(sz));
 705         if (ret < 0)
 706                 return ret;
 707
 708         evlist__for_each(evlist, evsel) {
 709                 ret = do_write(fd, &evsel->attr, sz);
 710                 if (ret < 0)
 711                         return ret;
 712                 /*
 713                  * write number of unique id per event
 714                  * there is one id per instance of an event
 715                  *
 716                  * copy into an nri to be independent of the
 717                  * type of ids,
 718                  */
 719                 nri = evsel->ids;
 720                 ret = do_write(fd, &nri, sizeof(nri));
 721                 if (ret < 0)
 722                         return ret;
 723
 724                 /*
 725                  * write event string as passed on cmdline
 726                  */
 727                 ret = do_write_string(fd, perf_evsel__name(evsel));
 728                 if (ret < 0)
 729                         return ret;
 730                 /*
 731                  * write unique ids for this event
 732                  */
 733                 ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
 734                 if (ret < 0)
 735                         return ret;
 736         }
 737         return 0;
 738 }
 739
 740 static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 741                          struct perf_evlist *evlist __maybe_unused)
 742 {
 743         char buf[MAXPATHLEN];
 744         char proc[32];
 745         u32 i, n;
 746         int ret;
 747
 748         /*
 749          * actual atual path to perf binary
 750          */
 751         sprintf(proc, "/proc/%d/exe", getpid());
 752         ret = readlink(proc, buf, sizeof(buf));
 753         if (ret <= 0)
 754                 return -1;
 755
 756         /* readlink() does not add null termination */
 757         buf[ret] = '\0';
 758
 759         /* account for binary path */
 760         n = header_argc + 1;
 761
 762         ret = do_write(fd, &n, sizeof(n));
 763         if (ret < 0)
 764                 return ret;
 765
 766         ret = do_write_string(fd, buf);
 767         if (ret < 0)
 768                 return ret;
 769
 770         for (i = 0 ; i < header_argc; i++) {
 771                 ret = do_write_string(fd, header_argv[i]);
 772                 if (ret < 0)
 773                         return ret;
 774         }
 775         return 0;
 776 }
 777
 778 #define CORE_SIB_FMT \
 779         "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
 780 #define THRD_SIB_FMT \
 781         "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
 782
 783 struct cpu_topo {
 784         u32 core_sib;
 785         u32 thread_sib;
 786         char **core_siblings;
 787         char **thread_siblings;
 788 };
 789
 790 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
 791 {
 792         FILE *fp;
 793         char filename[MAXPATHLEN];
 794         char *buf = NULL, *p;
 795         size_t len = 0;
 796         ssize_t sret;
 797         u32 i = 0;
 798         int ret = -1;
 799
 800         sprintf(filename, CORE_SIB_FMT, cpu);
 801         fp = fopen(filename, "r");
 802         if (!fp)
 803                 goto try_threads;
 804
 805         sret = getline(&buf, &len, fp);
 806         fclose(fp);
 807         if (sret <= 0)
 808                 goto try_threads;
 809
 810         p = strchr(buf, '\n');
 811         if (p)
 812                 *p = '\0';
 813
 814         for (i = 0; i < tp->core_sib; i++) {
 815                 if (!strcmp(buf, tp->core_siblings[i]))
 816                         break;
 817         }
 818         if (i == tp->core_sib) {
 819                 tp->core_siblings[i] = buf;
 820                 tp->core_sib++;
 821                 buf = NULL;
 822                 len = 0;
 823         }
 824         ret = 0;
 825
 826 try_threads:
 827         sprintf(filename, THRD_SIB_FMT, cpu);
 828         fp = fopen(filename, "r");
 829         if (!fp)
 830                 goto done;
 831
 832         if (getline(&buf, &len, fp) <= 0)
 833                 goto done;
 834
 835         p = strchr(buf, '\n');
 836         if (p)
 837                 *p = '\0';
 838
 839         for (i = 0; i < tp->thread_sib; i++) {
 840                 if (!strcmp(buf, tp->thread_siblings[i]))
 841                         break;
 842         }
 843         if (i == tp->thread_sib) {
 844                 tp->thread_siblings[i] = buf;
 845                 tp->thread_sib++;
 846                 buf = NULL;
 847         }
 848         ret = 0;
 849 done:
 850         if(fp)
 851                 fclose(fp);
 852         free(buf);
 853         return ret;
 854 }
 855
 856 static void free_cpu_topo(struct cpu_topo *tp)
 857 {
 858         u32 i;
 859
 860         if (!tp)
 861                 return;
 862
 863         for (i = 0 ; i < tp->core_sib; i++)
 864                 zfree(&tp->core_siblings[i]);
 865
 866         for (i = 0 ; i < tp->thread_sib; i++)
 867                 zfree(&tp->thread_siblings[i]);
 868
 869         free(tp);
 870 }
 871
 872 static struct cpu_topo *build_cpu_topology(void)
 873 {
 874         struct cpu_topo *tp;
 875         void *addr;
 876         u32 nr, i;
 877         size_t sz;
 878         long ncpus;
 879         int ret = -1;
 880
 881         ncpus = sysconf(_SC_NPROCESSORS_CONF);
 882         if (ncpus < 0)
 883                 return NULL;
 884
 885         nr = (u32)(ncpus & UINT_MAX);
 886
 887         sz = nr * sizeof(char *);
 888
 889         addr = calloc(1, sizeof(*tp) + 2 * sz);
 890         if (!addr)
 891                 return NULL;
 892
 893         tp = addr;
 894
 895         addr += sizeof(*tp);
 896         tp->core_siblings = addr;
 897         addr += sz;
 898         tp->thread_siblings = addr;
 899
 900         for (i = 0; i < nr; i++) {
 901                 ret = build_cpu_topo(tp, i);
 902                 if (ret < 0)
 903                         break;
 904         }
 905         if (ret) {
 906                 free_cpu_topo(tp);
 907                 tp = NULL;
 908         }
 909         return tp;
 910 }
 911
 912 static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
 913                           struct perf_evlist *evlist __maybe_unused)
 914 {
 915         struct cpu_topo *tp;
 916         u32 i;
 917         int ret;
 918
 919         tp = build_cpu_topology();
 920         if (!tp)
 921                 return -1;
 922
 923         ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
 924         if (ret < 0)
 925                 goto done;
 926
 927         for (i = 0; i < tp->core_sib; i++) {
 928                 ret = do_write_string(fd, tp->core_siblings[i]);
 929                 if (ret < 0)
 930                         goto done;
 931         }
 932         ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
 933         if (ret < 0)
 934                 goto done;
 935
 936         for (i = 0; i < tp->thread_sib; i++) {
 937                 ret = do_write_string(fd, tp->thread_siblings[i]);
 938                 if (ret < 0)
 939                         break;
 940         }
 941 done:
 942         free_cpu_topo(tp);
 943         return ret;
 944 }
 945
 946
 947
 948 static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
 949                           struct perf_evlist *evlist __maybe_unused)
 950 {
 951         char *buf = NULL;
 952         FILE *fp;
 953         size_t len = 0;
 954         int ret = -1, n;
 955         uint64_t mem;
 956
 957         fp = fopen("/proc/meminfo", "r");
 958         if (!fp)
 959                 return -1;
 960
 961         while (getline(&buf, &len, fp) > 0) {
 962                 ret = strncmp(buf, "MemTotal:", 9);
 963                 if (!ret)
 964                         break;
 965         }
 966         if (!ret) {
 967                 n = sscanf(buf, "%*s %"PRIu64, &mem);
 968                 if (n == 1)
 969                         ret = do_write(fd, &mem, sizeof(mem));
 970         } else
 971                 ret = -1;
 972         free(buf);
 973         fclose(fp);
 974         return ret;
 975 }
 976
 977 static int write_topo_node(int fd, int node)
 978 {
 979         char str[MAXPATHLEN];
 980         char field[32];
 981         char *buf = NULL, *p;
 982         size_t len = 0;
 983         FILE *fp;
 984         u64 mem_total, mem_free, mem;
 985         int ret = -1;
 986
 987         sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
 988         fp = fopen(str, "r");
 989         if (!fp)
 990                 return -1;
 991
 992         while (getline(&buf, &len, fp) > 0) {
 993                 /* skip over invalid lines */
 994                 if (!strchr(buf, ':'))
 995                         continue;
 996                 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
 997                         goto done;
 998                 if (!strcmp(field, "MemTotal:"))
 999                         mem_total = mem;
1000                 if (!strcmp(field, "MemFree:"))
1001                         mem_free = mem;
1002         }
1003
1004         fclose(fp);
1005         fp = NULL;
1006
1007         ret = do_write(fd, &mem_total, sizeof(u64));
1008         if (ret)
1009                 goto done;
1010
1011         ret = do_write(fd, &mem_free, sizeof(u64));
1012         if (ret)
1013                 goto done;
1014
1015         ret = -1;
1016         sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
1017
1018         fp = fopen(str, "r");
1019         if (!fp)
1020                 goto done;
1021
1022         if (getline(&buf, &len, fp) <= 0)
1023                 goto done;
1024
1025         p = strchr(buf, '\n');
1026         if (p)
1027                 *p = '\0';
1028
1029         ret = do_write_string(fd, buf);
1030 done:
1031         free(buf);
1032         if (fp)
1033                 fclose(fp);
1034         return ret;
1035 }
1036
1037 static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
1038                           struct perf_evlist *evlist __maybe_unused)
1039 {
1040         char *buf = NULL;
1041         size_t len = 0;
1042         FILE *fp;
1043         struct cpu_map *node_map = NULL;
1044         char *c;
1045         u32 nr, i, j;
1046         int ret = -1;
1047
1048         fp = fopen("/sys/devices/system/node/online", "r");
1049         if (!fp)
1050                 return -1;
1051
1052         if (getline(&buf, &len, fp) <= 0)
1053                 goto done;
1054
1055         c = strchr(buf, '\n');
1056         if (c)
1057                 *c = '\0';
1058
1059         node_map = cpu_map__new(buf);
1060         if (!node_map)
1061                 goto done;
1062
1063         nr = (u32)node_map->nr;
1064
1065         ret = do_write(fd, &nr, sizeof(nr));
1066         if (ret < 0)
1067                 goto done;
1068
1069         for (i = 0; i < nr; i++) {
1070                 j = (u32)node_map->map[i];
1071                 ret = do_write(fd, &j, sizeof(j));
1072                 if (ret < 0)
1073                         break;
1074
1075                 ret = write_topo_node(fd, i);
1076                 if (ret < 0)
1077                         break;
1078         }
1079 done:
1080         free(buf);
1081         fclose(fp);
1082         free(node_map);
1083         return ret;
1084 }
1085
1086 /*
1087  * File format:
1088  *
1089  * struct pmu_mappings {
1090  *      u32     pmu_num;
1091  *      struct pmu_map {
1092  *              u32     type;
1093  *              char    name[];
1094  *      }[pmu_num];
1095  * };
1096  */
1097
1098 static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
1099                               struct perf_evlist *evlist __maybe_unused)
1100 {
1101         struct perf_pmu *pmu = NULL;
1102         off_t offset = lseek(fd, 0, SEEK_CUR);
1103         __u32 pmu_num = 0;
1104         int ret;
1105
1106         /* write real pmu_num later */
1107         ret = do_write(fd, &pmu_num, sizeof(pmu_num));
1108         if (ret < 0)
1109                 return ret;
1110
1111         while ((pmu = perf_pmu__scan(pmu))) {
1112                 if (!pmu->name)
1113                         continue;
1114                 pmu_num++;
1115
1116                 ret = do_write(fd, &pmu->type, sizeof(pmu->type));
1117                 if (ret < 0)
1118                         return ret;
1119
1120                 ret = do_write_string(fd, pmu->name);
1121                 if (ret < 0)
1122                         return ret;
1123         }
1124
1125         if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
1126                 /* discard all */
1127                 lseek(fd, offset, SEEK_SET);
1128                 return -1;
1129         }
1130
1131         return 0;
1132 }
1133
1134 /*
1135  * File format:
1136  *
1137  * struct group_descs {
1138  *      u32     nr_groups;
1139  *      struct group_desc {
1140  *              char    name[];
1141  *              u32     leader_idx;
1142  *              u32     nr_members;
1143  *      }[nr_groups];
1144  * };
1145  */
1146 static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
1147                             struct perf_evlist *evlist)
1148 {
1149         u32 nr_groups = evlist->nr_groups;
1150         struct perf_evsel *evsel;
1151         int ret;
1152
1153         ret = do_write(fd, &nr_groups, sizeof(nr_groups));
1154         if (ret < 0)
1155                 return ret;
1156
1157         evlist__for_each(evlist, evsel) {
1158                 if (perf_evsel__is_group_leader(evsel) &&
1159                     evsel->nr_members > 1) {
1160                         const char *name = evsel->group_name ?: "{anon_group}";
1161                         u32 leader_idx = evsel->idx;
1162                         u32 nr_members = evsel->nr_members;
1163
1164                         ret = do_write_string(fd, name);
1165                         if (ret < 0)
1166                                 return ret;
1167
1168                         ret = do_write(fd, &leader_idx, sizeof(leader_idx));
1169                         if (ret < 0)
1170                                 return ret;
1171
1172                         ret = do_write(fd, &nr_members, sizeof(nr_members));
1173                         if (ret < 0)
1174                                 return ret;
1175                 }
1176         }
1177         return 0;
1178 }
1179
1180 /*
1181  * default get_cpuid(): nothing gets recorded
1182  * actual implementation must be in arch/$(ARCH)/util/header.c
1183  */
1184 int __attribute__ ((weak)) get_cpuid(char *buffer __maybe_unused,
1185                                      size_t sz __maybe_unused)
1186 {
1187         return -1;
1188 }
1189
1190 static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
1191                        struct perf_evlist *evlist __maybe_unused)
1192 {
1193         char buffer[64];
1194         int ret;
1195
1196         ret = get_cpuid(buffer, sizeof(buffer));
1197         if (!ret)
1198                 goto write_it;
1199
1200         return -1;
1201 write_it:
1202         return do_write_string(fd, buffer);
1203 }
1204
1205 static int write_branch_stack(int fd __maybe_unused,
1206                               struct perf_header *h __maybe_unused,
1207                        struct perf_evlist *evlist __maybe_unused)
1208 {
1209         return 0;
1210 }
1211
1212 static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
1213                            FILE *fp)
1214 {
1215         fprintf(fp, "# hostname : %s\n", ph->env.hostname);
1216 }
1217
1218 static void print_osrelease(struct perf_header *ph, int fd __maybe_unused,
1219                             FILE *fp)
1220 {
1221         fprintf(fp, "# os release : %s\n", ph->env.os_release);
1222 }
1223
1224 static void print_arch(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1225 {
1226         fprintf(fp, "# arch : %s\n", ph->env.arch);
1227 }
1228
1229 static void print_cpudesc(struct perf_header *ph, int fd __maybe_unused,
1230                           FILE *fp)
1231 {
1232         fprintf(fp, "# cpudesc : %s\n", ph->env.cpu_desc);
1233 }
1234
1235 static void print_nrcpus(struct perf_header *ph, int fd __maybe_unused,
1236                          FILE *fp)
1237 {
1238         fprintf(fp, "# nrcpus online : %u\n", ph->env.nr_cpus_online);
1239         fprintf(fp, "# nrcpus avail : %u\n", ph->env.nr_cpus_avail);
1240 }
1241
1242 static void print_version(struct perf_header *ph, int fd __maybe_unused,
1243                           FILE *fp)
1244 {
1245         fprintf(fp, "# perf version : %s\n", ph->env.version);
1246 }
1247
1248 static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
1249                           FILE *fp)
1250 {
1251         int nr, i;
1252         char *str;
1253
1254         nr = ph->env.nr_cmdline;
1255         str = ph->env.cmdline;
1256
1257         fprintf(fp, "# cmdline : ");
1258
1259         for (i = 0; i < nr; i++) {
1260                 fprintf(fp, "%s ", str);
1261                 str += strlen(str) + 1;
1262         }
1263         fputc('\n', fp);
1264 }
1265
1266 static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
1267                                FILE *fp)
1268 {
1269         int nr, i;
1270         char *str;
1271
1272         nr = ph->env.nr_sibling_cores;
1273         str = ph->env.sibling_cores;
1274
1275         for (i = 0; i < nr; i++) {
1276                 fprintf(fp, "# sibling cores   : %s\n", str);
1277                 str += strlen(str) + 1;
1278         }
1279
1280         nr = ph->env.nr_sibling_threads;
1281         str = ph->env.sibling_threads;
1282
1283         for (i = 0; i < nr; i++) {
1284                 fprintf(fp, "# sibling threads : %s\n", str);
1285                 str += strlen(str) + 1;
1286         }
1287 }
1288
1289 static void free_event_desc(struct perf_evsel *events)
1290 {
1291         struct perf_evsel *evsel;
1292
1293         if (!events)
1294                 return;
1295
1296         for (evsel = events; evsel->attr.size; evsel++) {
1297                 zfree(&evsel->name);
1298                 zfree(&evsel->id);
1299         }
1300
1301         free(events);
1302 }
1303
1304 static struct perf_evsel *
1305 read_event_desc(struct perf_header *ph, int fd)
1306 {
1307         struct perf_evsel *evsel, *events = NULL;
1308         u64 *id;
1309         void *buf = NULL;
1310         u32 nre, sz, nr, i, j;
1311         ssize_t ret;
1312         size_t msz;
1313
1314         /* number of events */
1315         ret = readn(fd, &nre, sizeof(nre));
1316         if (ret != (ssize_t)sizeof(nre))
1317                 goto error;
1318
1319         if (ph->needs_swap)
1320                 nre = bswap_32(nre);
1321
1322         ret = readn(fd, &sz, sizeof(sz));
1323         if (ret != (ssize_t)sizeof(sz))
1324                 goto error;
1325
1326         if (ph->needs_swap)
1327                 sz = bswap_32(sz);
1328
1329         /* buffer to hold on file attr struct */
1330         buf = malloc(sz);
1331         if (!buf)
1332                 goto error;
1333
1334         /* the last event terminates with evsel->attr.size == 0: */
1335         events = calloc(nre + 1, sizeof(*events));
1336         if (!events)
1337                 goto error;
1338
1339         msz = sizeof(evsel->attr);
1340         if (sz < msz)
1341                 msz = sz;
1342
1343         for (i = 0, evsel = events; i < nre; evsel++, i++) {
1344                 evsel->idx = i;
1345
1346                 /*
1347                  * must read entire on-file attr struct to
1348                  * sync up with layout.
1349                  */
1350                 ret = readn(fd, buf, sz);
1351                 if (ret != (ssize_t)sz)
1352                         goto error;
1353
1354                 if (ph->needs_swap)
1355                         perf_event__attr_swap(buf);
1356
1357                 memcpy(&evsel->attr, buf, msz);
1358
1359                 ret = readn(fd, &nr, sizeof(nr));
1360                 if (ret != (ssize_t)sizeof(nr))
1361                         goto error;
1362
1363                 if (ph->needs_swap) {
1364                         nr = bswap_32(nr);
1365                         evsel->needs_swap = true;
1366                 }
1367
1368                 evsel->name = do_read_string(fd, ph);
1369
1370                 if (!nr)
1371                         continue;
1372
1373                 id = calloc(nr, sizeof(*id));
1374                 if (!id)
1375                         goto error;
1376                 evsel->ids = nr;
1377                 evsel->id = id;
1378
1379                 for (j = 0 ; j < nr; j++) {
1380                         ret = readn(fd, id, sizeof(*id));
1381                         if (ret != (ssize_t)sizeof(*id))
1382                                 goto error;
1383                         if (ph->needs_swap)
1384                                 *id = bswap_64(*id);
1385                         id++;
1386                 }
1387         }
1388 out:
1389         free(buf);
1390         return events;
1391 error:
1392         if (events)
1393                 free_event_desc(events);
1394         events = NULL;
1395         goto out;
1396 }
1397
1398 static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1399 {
1400         struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
1401         u32 j;
1402         u64 *id;
1403
1404         if (!events) {
1405                 fprintf(fp, "# event desc: not available or unable to read\n");
1406                 return;
1407         }
1408
1409         for (evsel = events; evsel->attr.size; evsel++) {
1410                 fprintf(fp, "# event : name = %s, ", evsel->name);
1411
1412                 fprintf(fp, "type = %d, config = 0x%"PRIx64
1413                             ", config1 = 0x%"PRIx64", config2 = 0x%"PRIx64,
1414                                 evsel->attr.type,
1415                                 (u64)evsel->attr.config,
1416                                 (u64)evsel->attr.config1,
1417                                 (u64)evsel->attr.config2);
1418
1419                 fprintf(fp, ", excl_usr = %d, excl_kern = %d",
1420                                 evsel->attr.exclude_user,
1421                                 evsel->attr.exclude_kernel);
1422
1423                 fprintf(fp, ", excl_host = %d, excl_guest = %d",
1424                                 evsel->attr.exclude_host,
1425                                 evsel->attr.exclude_guest);
1426
1427                 fprintf(fp, ", precise_ip = %d", evsel->attr.precise_ip);
1428
1429                 fprintf(fp, ", attr_mmap2 = %d", evsel->attr.mmap2);
1430                 fprintf(fp, ", attr_mmap  = %d", evsel->attr.mmap);
1431                 fprintf(fp, ", attr_mmap_data = %d", evsel->attr.mmap_data);
1432                 if (evsel->ids) {
1433                         fprintf(fp, ", id = {");
1434                         for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1435                                 if (j)
1436                                         fputc(',', fp);
1437                                 fprintf(fp, " %"PRIu64, *id);
1438                         }
1439                         fprintf(fp, " }");
1440                 }
1441
1442                 fputc('\n', fp);
1443         }
1444
1445         free_event_desc(events);
1446 }
1447
1448 static void print_total_mem(struct perf_header *ph, int fd __maybe_unused,
1449                             FILE *fp)
1450 {
1451         fprintf(fp, "# total memory : %Lu kB\n", ph->env.total_mem);
1452 }
1453
1454 static void print_numa_topology(struct perf_header *ph, int fd __maybe_unused,
1455                                 FILE *fp)
1456 {
1457         u32 nr, c, i;
1458         char *str, *tmp;
1459         uint64_t mem_total, mem_free;
1460
1461         /* nr nodes */
1462         nr = ph->env.nr_numa_nodes;
1463         str = ph->env.numa_nodes;
1464
1465         for (i = 0; i < nr; i++) {
1466                 /* node number */
1467                 c = strtoul(str, &tmp, 0);
1468                 if (*tmp != ':')
1469                         goto error;
1470
1471                 str = tmp + 1;
1472                 mem_total = strtoull(str, &tmp, 0);
1473                 if (*tmp != ':')
1474                         goto error;
1475
1476                 str = tmp + 1;
1477                 mem_free = strtoull(str, &tmp, 0);
1478                 if (*tmp != ':')
1479                         goto error;
1480
1481                 fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
1482                             " free = %"PRIu64" kB\n",
1483                         c, mem_total, mem_free);
1484
1485                 str = tmp + 1;
1486                 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1487
1488                 str += strlen(str) + 1;
1489         }
1490         return;
1491 error:
1492         fprintf(fp, "# numa topology : not available\n");
1493 }
1494
1495 static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1496 {
1497         fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
1498 }
1499
1500 static void print_branch_stack(struct perf_header *ph __maybe_unused,
1501                                int fd __maybe_unused, FILE *fp)
1502 {
1503         fprintf(fp, "# contains samples with branch stack\n");
1504 }
1505
1506 static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
1507                                FILE *fp)
1508 {
1509         const char *delimiter = "# pmu mappings: ";
1510         char *str, *tmp;
1511         u32 pmu_num;
1512         u32 type;
1513
1514         pmu_num = ph->env.nr_pmu_mappings;
1515         if (!pmu_num) {
1516                 fprintf(fp, "# pmu mappings: not available\n");
1517                 return;
1518         }
1519
1520         str = ph->env.pmu_mappings;
1521
1522         while (pmu_num) {
1523                 type = strtoul(str, &tmp, 0);
1524                 if (*tmp != ':')
1525                         goto error;
1526
1527                 str = tmp + 1;
1528                 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1529
1530                 delimiter = ", ";
1531                 str += strlen(str) + 1;
1532                 pmu_num--;
1533         }
1534
1535         fprintf(fp, "\n");
1536
1537         if (!pmu_num)
1538                 return;
1539 error:
1540         fprintf(fp, "# pmu mappings: unable to read\n");
1541 }
1542
1543 static void print_group_desc(struct perf_header *ph, int fd __maybe_unused,
1544                              FILE *fp)
1545 {
1546         struct perf_session *session;
1547         struct perf_evsel *evsel;
1548         u32 nr = 0;
1549
1550         session = container_of(ph, struct perf_session, header);
1551
1552         evlist__for_each(session->evlist, evsel) {
1553                 if (perf_evsel__is_group_leader(evsel) &&
1554                     evsel->nr_members > 1) {
1555                         fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1556                                 perf_evsel__name(evsel));
1557
1558                         nr = evsel->nr_members - 1;
1559                 } else if (nr) {
1560                         fprintf(fp, ",%s", perf_evsel__name(evsel));
1561
1562                         if (--nr == 0)
1563                                 fprintf(fp, "}\n");
1564                 }
1565         }
1566 }
1567
1568 static int __event_process_build_id(struct build_id_event *bev,
1569                                     char *filename,
1570                                     struct perf_session *session)
1571 {
1572         int err = -1;
1573         struct dsos *dsos;
1574         struct machine *machine;
1575         u16 misc;
1576         struct dso *dso;
1577         enum dso_kernel_type dso_type;
1578
1579         machine = perf_session__findnew_machine(session, bev->pid);
1580         if (!machine)
1581                 goto out;
1582
1583         misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1584
1585         switch (misc) {
1586         case PERF_RECORD_MISC_KERNEL:
1587                 dso_type = DSO_TYPE_KERNEL;
1588                 dsos = &machine->kernel_dsos;
1589                 break;
1590         case PERF_RECORD_MISC_GUEST_KERNEL:
1591                 dso_type = DSO_TYPE_GUEST_KERNEL;
1592                 dsos = &machine->kernel_dsos;
1593                 break;
1594         case PERF_RECORD_MISC_USER:
1595         case PERF_RECORD_MISC_GUEST_USER:
1596                 dso_type = DSO_TYPE_USER;
1597                 dsos = &machine->user_dsos;
1598                 break;
1599         default:
1600                 goto out;
1601         }
1602
1603         dso = __dsos__findnew(dsos, filename);
1604         if (dso != NULL) {
1605                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1606
1607                 dso__set_build_id(dso, &bev->build_id);
1608
1609                 if (filename[0] == '[')
1610                         dso->kernel = dso_type;
1611
1612                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1613                                   sbuild_id);
1614                 pr_debug("build id event received for %s: %s\n",
1615                          dso->long_name, sbuild_id);
1616         }
1617
1618         err = 0;
1619 out:
1620         return err;
1621 }
1622
1623 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1624                                                  int input, u64 offset, u64 size)
1625 {
1626         struct perf_session *session = container_of(header, struct perf_session, header);
1627         struct {
1628                 struct perf_event_header   header;
1629                 u8                         build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1630                 char                       filename[0];
1631         } old_bev;
1632         struct build_id_event bev;
1633         char filename[PATH_MAX];
1634         u64 limit = offset + size;
1635
1636         while (offset < limit) {
1637                 ssize_t len;
1638
1639                 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1640                         return -1;
1641
1642                 if (header->needs_swap)
1643                         perf_event_header__bswap(&old_bev.header);
1644
1645                 len = old_bev.header.size - sizeof(old_bev);
1646                 if (readn(input, filename, len) != len)
1647                         return -1;
1648
1649                 bev.header = old_bev.header;
1650
1651                 /*
1652                  * As the pid is the missing value, we need to fill
1653                  * it properly. The header.misc value give us nice hint.
1654                  */
1655                 bev.pid = HOST_KERNEL_ID;
1656                 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1657                     bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1658                         bev.pid = DEFAULT_GUEST_KERNEL_ID;
1659
1660                 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1661                 __event_process_build_id(&bev, filename, session);
1662
1663                 offset += bev.header.size;
1664         }
1665
1666         return 0;
1667 }
1668
1669 static int perf_header__read_build_ids(struct perf_header *header,
1670                                        int input, u64 offset, u64 size)
1671 {
1672         struct perf_session *session = container_of(header, struct perf_session, header);
1673         struct build_id_event bev;
1674         char filename[PATH_MAX];
1675         u64 limit = offset + size, orig_offset = offset;
1676         int err = -1;
1677
1678         while (offset < limit) {
1679                 ssize_t len;
1680
1681                 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1682                         goto out;
1683
1684                 if (header->needs_swap)
1685                         perf_event_header__bswap(&bev.header);
1686
1687                 len = bev.header.size - sizeof(bev);
1688                 if (readn(input, filename, len) != len)
1689                         goto out;
1690                 /*
1691                  * The a1645ce1 changeset:
1692                  *
1693                  * "perf: 'perf kvm' tool for monitoring guest performance from host"
1694                  *
1695                  * Added a field to struct build_id_event that broke the file
1696                  * format.
1697                  *
1698                  * Since the kernel build-id is the first entry, process the
1699                  * table using the old format if the well known
1700                  * '[kernel.kallsyms]' string for the kernel build-id has the
1701                  * first 4 characters chopped off (where the pid_t sits).
1702                  */
1703                 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1704                         if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1705                                 return -1;
1706                         return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1707                 }
1708
1709                 __event_process_build_id(&bev, filename, session);
1710
1711                 offset += bev.header.size;
1712         }
1713         err = 0;
1714 out:
1715         return err;
1716 }
1717
1718 static int process_tracing_data(struct perf_file_section *section __maybe_unused,
1719                                 struct perf_header *ph __maybe_unused,
1720                                 int fd, void *data)
1721 {
1722         ssize_t ret = trace_report(fd, data, false);
1723         return ret < 0 ? -1 : 0;
1724 }
1725
1726 static int process_build_id(struct perf_file_section *section,
1727                             struct perf_header *ph, int fd,
1728                             void *data __maybe_unused)
1729 {
1730         if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1731                 pr_debug("Failed to read buildids, continuing...\n");
1732         return 0;
1733 }
1734
1735 static int process_hostname(struct perf_file_section *section __maybe_unused,
1736                             struct perf_header *ph, int fd,
1737                             void *data __maybe_unused)
1738 {
1739         ph->env.hostname = do_read_string(fd, ph);
1740         return ph->env.hostname ? 0 : -ENOMEM;
1741 }
1742
1743 static int process_osrelease(struct perf_file_section *section __maybe_unused,
1744                              struct perf_header *ph, int fd,
1745                              void *data __maybe_unused)
1746 {
1747         ph->env.os_release = do_read_string(fd, ph);
1748         return ph->env.os_release ? 0 : -ENOMEM;
1749 }
1750
1751 static int process_version(struct perf_file_section *section __maybe_unused,
1752                            struct perf_header *ph, int fd,
1753                            void *data __maybe_unused)
1754 {
1755         ph->env.version = do_read_string(fd, ph);
1756         return ph->env.version ? 0 : -ENOMEM;
1757 }
1758
1759 static int process_arch(struct perf_file_section *section __maybe_unused,
1760                         struct perf_header *ph, int fd,
1761                         void *data __maybe_unused)
1762 {
1763         ph->env.arch = do_read_string(fd, ph);
1764         return ph->env.arch ? 0 : -ENOMEM;
1765 }
1766
1767 static int process_nrcpus(struct perf_file_section *section __maybe_unused,
1768                           struct perf_header *ph, int fd,
1769                           void *data __maybe_unused)
1770 {
1771         ssize_t ret;
1772         u32 nr;
1773
1774         ret = readn(fd, &nr, sizeof(nr));
1775         if (ret != sizeof(nr))
1776                 return -1;
1777
1778         if (ph->needs_swap)
1779                 nr = bswap_32(nr);
1780
1781         ph->env.nr_cpus_online = nr;
1782
1783         ret = readn(fd, &nr, sizeof(nr));
1784         if (ret != sizeof(nr))
1785                 return -1;
1786
1787         if (ph->needs_swap)
1788                 nr = bswap_32(nr);
1789
1790         ph->env.nr_cpus_avail = nr;
1791         return 0;
1792 }
1793
1794 static int process_cpudesc(struct perf_file_section *section __maybe_unused,
1795                            struct perf_header *ph, int fd,
1796                            void *data __maybe_unused)
1797 {
1798         ph->env.cpu_desc = do_read_string(fd, ph);
1799         return ph->env.cpu_desc ? 0 : -ENOMEM;
1800 }
1801
1802 static int process_cpuid(struct perf_file_section *section __maybe_unused,
1803                          struct perf_header *ph,  int fd,
1804                          void *data __maybe_unused)
1805 {
1806         ph->env.cpuid = do_read_string(fd, ph);
1807         return ph->env.cpuid ? 0 : -ENOMEM;
1808 }
1809
1810 static int process_total_mem(struct perf_file_section *section __maybe_unused,
1811                              struct perf_header *ph, int fd,
1812                              void *data __maybe_unused)
1813 {
1814         uint64_t mem;
1815         ssize_t ret;
1816
1817         ret = readn(fd, &mem, sizeof(mem));
1818         if (ret != sizeof(mem))
1819                 return -1;
1820
1821         if (ph->needs_swap)
1822                 mem = bswap_64(mem);
1823
1824         ph->env.total_mem = mem;
1825         return 0;
1826 }
1827
1828 static struct perf_evsel *
1829 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
1830 {
1831         struct perf_evsel *evsel;
1832
1833         evlist__for_each(evlist, evsel) {
1834                 if (evsel->idx == idx)
1835                         return evsel;
1836         }
1837
1838         return NULL;
1839 }
1840
1841 static void
1842 perf_evlist__set_event_name(struct perf_evlist *evlist,
1843                             struct perf_evsel *event)
1844 {
1845         struct perf_evsel *evsel;
1846
1847         if (!event->name)
1848                 return;
1849
1850         evsel = perf_evlist__find_by_index(evlist, event->idx);
1851         if (!evsel)
1852                 return;
1853
1854         if (evsel->name)
1855                 return;
1856
1857         evsel->name = strdup(event->name);
1858 }
1859
1860 static int
1861 process_event_desc(struct perf_file_section *section __maybe_unused,
1862                    struct perf_header *header, int fd,
1863                    void *data __maybe_unused)
1864 {
1865         struct perf_session *session;
1866         struct perf_evsel *evsel, *events = read_event_desc(header, fd);
1867
1868         if (!events)
1869                 return 0;
1870
1871         session = container_of(header, struct perf_session, header);
1872         for (evsel = events; evsel->attr.size; evsel++)
1873                 perf_evlist__set_event_name(session->evlist, evsel);
1874
1875         free_event_desc(events);
1876
1877         return 0;
1878 }
1879
1880 static int process_cmdline(struct perf_file_section *section __maybe_unused,
1881                            struct perf_header *ph, int fd,
1882                            void *data __maybe_unused)
1883 {
1884         ssize_t ret;
1885         char *str;
1886         u32 nr, i;
1887         struct strbuf sb;
1888
1889         ret = readn(fd, &nr, sizeof(nr));
1890         if (ret != sizeof(nr))
1891                 return -1;
1892
1893         if (ph->needs_swap)
1894                 nr = bswap_32(nr);
1895
1896         ph->env.nr_cmdline = nr;
1897         strbuf_init(&sb, 128);
1898
1899         for (i = 0; i < nr; i++) {
1900                 str = do_read_string(fd, ph);
1901                 if (!str)
1902                         goto error;
1903
1904                 /* include a NULL character at the end */
1905                 strbuf_add(&sb, str, strlen(str) + 1);
1906                 free(str);
1907         }
1908         ph->env.cmdline = strbuf_detach(&sb, NULL);
1909         return 0;
1910
1911 error:
1912         strbuf_release(&sb);
1913         return -1;
1914 }
1915
1916 static int process_cpu_topology(struct perf_file_section *section __maybe_unused,
1917                                 struct perf_header *ph, int fd,
1918                                 void *data __maybe_unused)
1919 {
1920         ssize_t ret;
1921         u32 nr, i;
1922         char *str;
1923         struct strbuf sb;
1924
1925         ret = readn(fd, &nr, sizeof(nr));
1926         if (ret != sizeof(nr))
1927                 return -1;
1928
1929         if (ph->needs_swap)
1930                 nr = bswap_32(nr);
1931
1932         ph->env.nr_sibling_cores = nr;
1933         strbuf_init(&sb, 128);
1934
1935         for (i = 0; i < nr; i++) {
1936                 str = do_read_string(fd, ph);
1937                 if (!str)
1938                         goto error;
1939
1940                 /* include a NULL character at the end */
1941                 strbuf_add(&sb, str, strlen(str) + 1);
1942                 free(str);
1943         }
1944         ph->env.sibling_cores = strbuf_detach(&sb, NULL);
1945
1946         ret = readn(fd, &nr, sizeof(nr));
1947         if (ret != sizeof(nr))
1948                 return -1;
1949
1950         if (ph->needs_swap)
1951                 nr = bswap_32(nr);
1952
1953         ph->env.nr_sibling_threads = nr;
1954
1955         for (i = 0; i < nr; i++) {
1956                 str = do_read_string(fd, ph);
1957                 if (!str)
1958                         goto error;
1959
1960                 /* include a NULL character at the end */
1961                 strbuf_add(&sb, str, strlen(str) + 1);
1962                 free(str);
1963         }
1964         ph->env.sibling_threads = strbuf_detach(&sb, NULL);
1965         return 0;
1966
1967 error:
1968         strbuf_release(&sb);
1969         return -1;
1970 }
1971
1972 static int process_numa_topology(struct perf_file_section *section __maybe_unused,
1973                                  struct perf_header *ph, int fd,
1974                                  void *data __maybe_unused)
1975 {
1976         ssize_t ret;
1977         u32 nr, node, i;
1978         char *str;
1979         uint64_t mem_total, mem_free;
1980         struct strbuf sb;
1981
1982         /* nr nodes */
1983         ret = readn(fd, &nr, sizeof(nr));
1984         if (ret != sizeof(nr))
1985                 goto error;
1986
1987         if (ph->needs_swap)
1988                 nr = bswap_32(nr);
1989
1990         ph->env.nr_numa_nodes = nr;
1991         strbuf_init(&sb, 256);
1992
1993         for (i = 0; i < nr; i++) {
1994                 /* node number */
1995                 ret = readn(fd, &node, sizeof(node));
1996                 if (ret != sizeof(node))
1997                         goto error;
1998
1999                 ret = readn(fd, &mem_total, sizeof(u64));
2000                 if (ret != sizeof(u64))
2001                         goto error;
2002
2003                 ret = readn(fd, &mem_free, sizeof(u64));
2004                 if (ret != sizeof(u64))
2005                         goto error;
2006
2007                 if (ph->needs_swap) {
2008                         node = bswap_32(node);
2009                         mem_total = bswap_64(mem_total);
2010                         mem_free = bswap_64(mem_free);
2011                 }
2012
2013                 strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
2014                             node, mem_total, mem_free);
2015
2016                 str = do_read_string(fd, ph);
2017                 if (!str)
2018                         goto error;
2019
2020                 /* include a NULL character at the end */
2021                 strbuf_add(&sb, str, strlen(str) + 1);
2022                 free(str);
2023         }
2024         ph->env.numa_nodes = strbuf_detach(&sb, NULL);
2025         return 0;
2026
2027 error:
2028         strbuf_release(&sb);
2029         return -1;
2030 }
2031
2032 static int process_pmu_mappings(struct perf_file_section *section __maybe_unused,
2033                                 struct perf_header *ph, int fd,
2034                                 void *data __maybe_unused)
2035 {
2036         ssize_t ret;
2037         char *name;
2038         u32 pmu_num;
2039         u32 type;
2040         struct strbuf sb;
2041
2042         ret = readn(fd, &pmu_num, sizeof(pmu_num));
2043         if (ret != sizeof(pmu_num))
2044                 return -1;
2045
2046         if (ph->needs_swap)
2047                 pmu_num = bswap_32(pmu_num);
2048
2049         if (!pmu_num) {
2050                 pr_debug("pmu mappings not available\n");
2051                 return 0;
2052         }
2053
2054         ph->env.nr_pmu_mappings = pmu_num;
2055         strbuf_init(&sb, 128);
2056
2057         while (pmu_num) {
2058                 if (readn(fd, &type, sizeof(type)) != sizeof(type))
2059                         goto error;
2060                 if (ph->needs_swap)
2061                         type = bswap_32(type);
2062
2063                 name = do_read_string(fd, ph);
2064                 if (!name)
2065                         goto error;
2066
2067                 strbuf_addf(&sb, "%u:%s", type, name);
2068                 /* include a NULL character at the end */
2069                 strbuf_add(&sb, "", 1);
2070
2071                 free(name);
2072                 pmu_num--;
2073         }
2074         ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
2075         return 0;
2076
2077 error:
2078         strbuf_release(&sb);
2079         return -1;
2080 }
2081
2082 static int process_group_desc(struct perf_file_section *section __maybe_unused,
2083                               struct perf_header *ph, int fd,
2084                               void *data __maybe_unused)
2085 {
2086         size_t ret = -1;
2087         u32 i, nr, nr_groups;
2088         struct perf_session *session;
2089         struct perf_evsel *evsel, *leader = NULL;
2090         struct group_desc {
2091                 char *name;
2092                 u32 leader_idx;
2093                 u32 nr_members;
2094         } *desc;
2095
2096         if (readn(fd, &nr_groups, sizeof(nr_groups)) != sizeof(nr_groups))
2097                 return -1;
2098
2099         if (ph->needs_swap)
2100                 nr_groups = bswap_32(nr_groups);
2101
2102         ph->env.nr_groups = nr_groups;
2103         if (!nr_groups) {
2104                 pr_debug("group desc not available\n");
2105                 return 0;
2106         }
2107
2108         desc = calloc(nr_groups, sizeof(*desc));
2109         if (!desc)
2110                 return -1;
2111
2112         for (i = 0; i < nr_groups; i++) {
2113                 desc[i].name = do_read_string(fd, ph);
2114                 if (!desc[i].name)
2115                         goto out_free;
2116
2117                 if (readn(fd, &desc[i].leader_idx, sizeof(u32)) != sizeof(u32))
2118                         goto out_free;
2119
2120                 if (readn(fd, &desc[i].nr_members, sizeof(u32)) != sizeof(u32))
2121                         goto out_free;
2122
2123                 if (ph->needs_swap) {
2124                         desc[i].leader_idx = bswap_32(desc[i].leader_idx);
2125                         desc[i].nr_members = bswap_32(desc[i].nr_members);
2126                 }
2127         }
2128
2129         /*
2130          * Rebuild group relationship based on the group_desc
2131          */
2132         session = container_of(ph, struct perf_session, header);
2133         session->evlist->nr_groups = nr_groups;
2134
2135         i = nr = 0;
2136         evlist__for_each(session->evlist, evsel) {
2137                 if (evsel->idx == (int) desc[i].leader_idx) {
2138                         evsel->leader = evsel;
2139                         /* {anon_group} is a dummy name */
2140                         if (strcmp(desc[i].name, "{anon_group}")) {
2141                                 evsel->group_name = desc[i].name;
2142                                 desc[i].name = NULL;
2143                         }
2144                         evsel->nr_members = desc[i].nr_members;
2145
2146                         if (i >= nr_groups || nr > 0) {
2147                                 pr_debug("invalid group desc\n");
2148                                 goto out_free;
2149                         }
2150
2151                         leader = evsel;
2152                         nr = evsel->nr_members - 1;
2153                         i++;
2154                 } else if (nr) {
2155                         /* This is a group member */
2156                         evsel->leader = leader;
2157
2158                         nr--;
2159                 }
2160         }
2161
2162         if (i != nr_groups || nr != 0) {
2163                 pr_debug("invalid group desc\n");
2164                 goto out_free;
2165         }
2166
2167         ret = 0;
2168 out_free:
2169         for (i = 0; i < nr_groups; i++)
2170                 zfree(&desc[i].name);
2171         free(desc);
2172
2173         return ret;
2174 }
2175
2176 struct feature_ops {
2177         int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
2178         void (*print)(struct perf_header *h, int fd, FILE *fp);
2179         int (*process)(struct perf_file_section *section,
2180                        struct perf_header *h, int fd, void *data);
2181         const char *name;
2182         bool full_only;
2183 };
2184
2185 #define FEAT_OPA(n, func) \
2186         [n] = { .name = #n, .write = write_##func, .print = print_##func }
2187 #define FEAT_OPP(n, func) \
2188         [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2189                 .process = process_##func }
2190 #define FEAT_OPF(n, func) \
2191         [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2192                 .process = process_##func, .full_only = true }
2193
2194 /* feature_ops not implemented: */
2195 #define print_tracing_data      NULL
2196 #define print_build_id          NULL
2197
2198 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2199         FEAT_OPP(HEADER_TRACING_DATA,   tracing_data),
2200         FEAT_OPP(HEADER_BUILD_ID,       build_id),
2201         FEAT_OPP(HEADER_HOSTNAME,       hostname),
2202         FEAT_OPP(HEADER_OSRELEASE,      osrelease),
2203         FEAT_OPP(HEADER_VERSION,        version),
2204         FEAT_OPP(HEADER_ARCH,           arch),
2205         FEAT_OPP(HEADER_NRCPUS,         nrcpus),
2206         FEAT_OPP(HEADER_CPUDESC,        cpudesc),
2207         FEAT_OPP(HEADER_CPUID,          cpuid),
2208         FEAT_OPP(HEADER_TOTAL_MEM,      total_mem),
2209         FEAT_OPP(HEADER_EVENT_DESC,     event_desc),
2210         FEAT_OPP(HEADER_CMDLINE,        cmdline),
2211         FEAT_OPF(HEADER_CPU_TOPOLOGY,   cpu_topology),
2212         FEAT_OPF(HEADER_NUMA_TOPOLOGY,  numa_topology),
2213         FEAT_OPA(HEADER_BRANCH_STACK,   branch_stack),
2214         FEAT_OPP(HEADER_PMU_MAPPINGS,   pmu_mappings),
2215         FEAT_OPP(HEADER_GROUP_DESC,     group_desc),
2216 };
2217
2218 struct header_print_data {
2219         FILE *fp;
2220         bool full; /* extended list of headers */
2221 };
2222
2223 static int perf_file_section__fprintf_info(struct perf_file_section *section,
2224                                            struct perf_header *ph,
2225                                            int feat, int fd, void *data)
2226 {
2227         struct header_print_data *hd = data;
2228
2229         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2230                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2231                                 "%d, continuing...\n", section->offset, feat);
2232                 return 0;
2233         }
2234         if (feat >= HEADER_LAST_FEATURE) {
2235                 pr_warning("unknown feature %d\n", feat);
2236                 return 0;
2237         }
2238         if (!feat_ops[feat].print)
2239                 return 0;
2240
2241         if (!feat_ops[feat].full_only || hd->full)
2242                 feat_ops[feat].print(ph, fd, hd->fp);
2243         else
2244                 fprintf(hd->fp, "# %s info available, use -I to display\n",
2245                         feat_ops[feat].name);
2246
2247         return 0;
2248 }
2249
2250 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2251 {
2252         struct header_print_data hd;
2253         struct perf_header *header = &session->header;
2254         int fd = perf_data_file__fd(session->file);
2255         hd.fp = fp;
2256         hd.full = full;
2257
2258         perf_header__process_sections(header, fd, &hd,
2259                                       perf_file_section__fprintf_info);
2260         return 0;
2261 }
2262
2263 static int do_write_feat(int fd, struct perf_header *h, int type,
2264                          struct perf_file_section **p,
2265                          struct perf_evlist *evlist)
2266 {
2267         int err;
2268         int ret = 0;
2269
2270         if (perf_header__has_feat(h, type)) {
2271                 if (!feat_ops[type].write)
2272                         return -1;
2273
2274                 (*p)->offset = lseek(fd, 0, SEEK_CUR);
2275
2276                 err = feat_ops[type].write(fd, h, evlist);
2277                 if (err < 0) {
2278                         pr_debug("failed to write feature %d\n", type);
2279
2280                         /* undo anything written */
2281                         lseek(fd, (*p)->offset, SEEK_SET);
2282
2283                         return -1;
2284                 }
2285                 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
2286                 (*p)++;
2287         }
2288         return ret;
2289 }
2290
2291 static int perf_header__adds_write(struct perf_header *header,
2292                                    struct perf_evlist *evlist, int fd)
2293 {
2294         int nr_sections;
2295         struct perf_file_section *feat_sec, *p;
2296         int sec_size;
2297         u64 sec_start;
2298         int feat;
2299         int err;
2300
2301         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2302         if (!nr_sections)
2303                 return 0;
2304
2305         feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2306         if (feat_sec == NULL)
2307                 return -ENOMEM;
2308
2309         sec_size = sizeof(*feat_sec) * nr_sections;
2310
2311         sec_start = header->feat_offset;
2312         lseek(fd, sec_start + sec_size, SEEK_SET);
2313
2314         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2315                 if (do_write_feat(fd, header, feat, &p, evlist))
2316                         perf_header__clear_feat(header, feat);
2317         }
2318
2319         lseek(fd, sec_start, SEEK_SET);
2320         /*
2321          * may write more than needed due to dropped feature, but
2322          * this is okay, reader will skip the mising entries
2323          */
2324         err = do_write(fd, feat_sec, sec_size);
2325         if (err < 0)
2326                 pr_debug("failed to write feature section\n");
2327         free(feat_sec);
2328         return err;
2329 }
2330
2331 int perf_header__write_pipe(int fd)
2332 {
2333         struct perf_pipe_file_header f_header;
2334         int err;
2335
2336         f_header = (struct perf_pipe_file_header){
2337                 .magic     = PERF_MAGIC,
2338                 .size      = sizeof(f_header),
2339         };
2340
2341         err = do_write(fd, &f_header, sizeof(f_header));
2342         if (err < 0) {
2343                 pr_debug("failed to write perf pipe header\n");
2344                 return err;
2345         }
2346
2347         return 0;
2348 }
2349
2350 int perf_session__write_header(struct perf_session *session,
2351                                struct perf_evlist *evlist,
2352                                int fd, bool at_exit)
2353 {
2354         struct perf_file_header f_header;
2355         struct perf_file_attr   f_attr;
2356         struct perf_header *header = &session->header;
2357         struct perf_evsel *evsel;
2358         u64 attr_offset;
2359         int err;
2360
2361         lseek(fd, sizeof(f_header), SEEK_SET);
2362
2363         evlist__for_each(session->evlist, evsel) {
2364                 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2365                 err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
2366                 if (err < 0) {
2367                         pr_debug("failed to write perf header\n");
2368                         return err;
2369                 }
2370         }
2371
2372         attr_offset = lseek(fd, 0, SEEK_CUR);
2373
2374         evlist__for_each(evlist, evsel) {
2375                 f_attr = (struct perf_file_attr){
2376                         .attr = evsel->attr,
2377                         .ids  = {
2378                                 .offset = evsel->id_offset,
2379                                 .size   = evsel->ids * sizeof(u64),
2380                         }
2381                 };
2382                 err = do_write(fd, &f_attr, sizeof(f_attr));
2383                 if (err < 0) {
2384                         pr_debug("failed to write perf header attribute\n");
2385                         return err;
2386                 }
2387         }
2388
2389         if (!header->data_offset)
2390                 header->data_offset = lseek(fd, 0, SEEK_CUR);
2391         header->feat_offset = header->data_offset + header->data_size;
2392
2393         if (at_exit) {
2394                 err = perf_header__adds_write(header, evlist, fd);
2395                 if (err < 0)
2396                         return err;
2397         }
2398
2399         f_header = (struct perf_file_header){
2400                 .magic     = PERF_MAGIC,
2401                 .size      = sizeof(f_header),
2402                 .attr_size = sizeof(f_attr),
2403                 .attrs = {
2404                         .offset = attr_offset,
2405                         .size   = evlist->nr_entries * sizeof(f_attr),
2406                 },
2407                 .data = {
2408                         .offset = header->data_offset,
2409                         .size   = header->data_size,
2410                 },
2411                 /* event_types is ignored, store zeros */
2412         };
2413
2414         memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2415
2416         lseek(fd, 0, SEEK_SET);
2417         err = do_write(fd, &f_header, sizeof(f_header));
2418         if (err < 0) {
2419                 pr_debug("failed to write perf header\n");
2420                 return err;
2421         }
2422         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2423
2424         return 0;
2425 }
2426
2427 static int perf_header__getbuffer64(struct perf_header *header,
2428                                     int fd, void *buf, size_t size)
2429 {
2430         if (readn(fd, buf, size) <= 0)
2431                 return -1;
2432
2433         if (header->needs_swap)
2434                 mem_bswap_64(buf, size);
2435
2436         return 0;
2437 }
2438
2439 int perf_header__process_sections(struct perf_header *header, int fd,
2440                                   void *data,
2441                                   int (*process)(struct perf_file_section *section,
2442                                                  struct perf_header *ph,
2443                                                  int feat, int fd, void *data))
2444 {
2445         struct perf_file_section *feat_sec, *sec;
2446         int nr_sections;
2447         int sec_size;
2448         int feat;
2449         int err;
2450
2451         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2452         if (!nr_sections)
2453                 return 0;
2454
2455         feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2456         if (!feat_sec)
2457                 return -1;
2458
2459         sec_size = sizeof(*feat_sec) * nr_sections;
2460
2461         lseek(fd, header->feat_offset, SEEK_SET);
2462
2463         err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2464         if (err < 0)
2465                 goto out_free;
2466
2467         for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2468                 err = process(sec++, header, feat, fd, data);
2469                 if (err < 0)
2470                         goto out_free;
2471         }
2472         err = 0;
2473 out_free:
2474         free(feat_sec);
2475         return err;
2476 }
2477
2478 static const int attr_file_abi_sizes[] = {
2479         [0] = PERF_ATTR_SIZE_VER0,
2480         [1] = PERF_ATTR_SIZE_VER1,
2481         [2] = PERF_ATTR_SIZE_VER2,
2482         [3] = PERF_ATTR_SIZE_VER3,
2483         0,
2484 };
2485
2486 /*
2487  * In the legacy file format, the magic number is not used to encode endianness.
2488  * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2489  * on ABI revisions, we need to try all combinations for all endianness to
2490  * detect the endianness.
2491  */
2492 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2493 {
2494         uint64_t ref_size, attr_size;
2495         int i;
2496
2497         for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2498                 ref_size = attr_file_abi_sizes[i]
2499                          + sizeof(struct perf_file_section);
2500                 if (hdr_sz != ref_size) {
2501                         attr_size = bswap_64(hdr_sz);
2502                         if (attr_size != ref_size)
2503                                 continue;
2504
2505                         ph->needs_swap = true;
2506                 }
2507                 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2508                          i,
2509                          ph->needs_swap);
2510                 return 0;
2511         }
2512         /* could not determine endianness */
2513         return -1;
2514 }
2515
2516 #define PERF_PIPE_HDR_VER0      16
2517
2518 static const size_t attr_pipe_abi_sizes[] = {
2519         [0] = PERF_PIPE_HDR_VER0,
2520         0,
2521 };
2522
2523 /*
2524  * In the legacy pipe format, there is an implicit assumption that endiannesss
2525  * between host recording the samples, and host parsing the samples is the
2526  * same. This is not always the case given that the pipe output may always be
2527  * redirected into a file and analyzed on a different machine with possibly a
2528  * different endianness and perf_event ABI revsions in the perf tool itself.
2529  */
2530 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2531 {
2532         u64 attr_size;
2533         int i;
2534
2535         for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2536                 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2537                         attr_size = bswap_64(hdr_sz);
2538                         if (attr_size != hdr_sz)
2539                                 continue;
2540
2541                         ph->needs_swap = true;
2542                 }
2543                 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2544                 return 0;
2545         }
2546         return -1;
2547 }
2548
2549 bool is_perf_magic(u64 magic)
2550 {
2551         if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2552                 || magic == __perf_magic2
2553                 || magic == __perf_magic2_sw)
2554                 return true;
2555
2556         return false;
2557 }
2558
2559 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2560                               bool is_pipe, struct perf_header *ph)
2561 {
2562         int ret;
2563
2564         /* check for legacy format */
2565         ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2566         if (ret == 0) {
2567                 ph->version = PERF_HEADER_VERSION_1;
2568                 pr_debug("legacy perf.data format\n");
2569                 if (is_pipe)
2570                         return try_all_pipe_abis(hdr_sz, ph);
2571
2572                 return try_all_file_abis(hdr_sz, ph);
2573         }
2574         /*
2575          * the new magic number serves two purposes:
2576          * - unique number to identify actual perf.data files
2577          * - encode endianness of file
2578          */
2579
2580         /* check magic number with one endianness */
2581         if (magic == __perf_magic2)
2582                 return 0;
2583
2584         /* check magic number with opposite endianness */
2585         if (magic != __perf_magic2_sw)
2586                 return -1;
2587
2588         ph->needs_swap = true;
2589         ph->version = PERF_HEADER_VERSION_2;
2590
2591         return 0;
2592 }
2593
2594 int perf_file_header__read(struct perf_file_header *header,
2595                            struct perf_header *ph, int fd)
2596 {
2597         ssize_t ret;
2598
2599         lseek(fd, 0, SEEK_SET);
2600
2601         ret = readn(fd, header, sizeof(*header));
2602         if (ret <= 0)
2603                 return -1;
2604
2605         if (check_magic_endian(header->magic,
2606                                header->attr_size, false, ph) < 0) {
2607                 pr_debug("magic/endian check failed\n");
2608                 return -1;
2609         }
2610
2611         if (ph->needs_swap) {
2612                 mem_bswap_64(header, offsetof(struct perf_file_header,
2613                              adds_features));
2614         }
2615
2616         if (header->size != sizeof(*header)) {
2617                 /* Support the previous format */
2618                 if (header->size == offsetof(typeof(*header), adds_features))
2619                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2620                 else
2621                         return -1;
2622         } else if (ph->needs_swap) {
2623                 /*
2624                  * feature bitmap is declared as an array of unsigned longs --
2625                  * not good since its size can differ between the host that
2626                  * generated the data file and the host analyzing the file.
2627                  *
2628                  * We need to handle endianness, but we don't know the size of
2629                  * the unsigned long where the file was generated. Take a best
2630                  * guess at determining it: try 64-bit swap first (ie., file
2631                  * created on a 64-bit host), and check if the hostname feature
2632                  * bit is set (this feature bit is forced on as of fbe96f2).
2633                  * If the bit is not, undo the 64-bit swap and try a 32-bit
2634                  * swap. If the hostname bit is still not set (e.g., older data
2635                  * file), punt and fallback to the original behavior --
2636                  * clearing all feature bits and setting buildid.
2637                  */
2638                 mem_bswap_64(&header->adds_features,
2639                             BITS_TO_U64(HEADER_FEAT_BITS));
2640
2641                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2642                         /* unswap as u64 */
2643                         mem_bswap_64(&header->adds_features,
2644                                     BITS_TO_U64(HEADER_FEAT_BITS));
2645
2646                         /* unswap as u32 */
2647                         mem_bswap_32(&header->adds_features,
2648                                     BITS_TO_U32(HEADER_FEAT_BITS));
2649                 }
2650
2651                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2652                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2653                         set_bit(HEADER_BUILD_ID, header->adds_features);
2654                 }
2655         }
2656
2657         memcpy(&ph->adds_features, &header->adds_features,
2658                sizeof(ph->adds_features));
2659
2660         ph->data_offset  = header->data.offset;
2661         ph->data_size    = header->data.size;
2662         ph->feat_offset  = header->data.offset + header->data.size;
2663         return 0;
2664 }
2665
2666 static int perf_file_section__process(struct perf_file_section *section,
2667                                       struct perf_header *ph,
2668                                       int feat, int fd, void *data)
2669 {
2670         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2671                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2672                           "%d, continuing...\n", section->offset, feat);
2673                 return 0;
2674         }
2675
2676         if (feat >= HEADER_LAST_FEATURE) {
2677                 pr_debug("unknown feature %d, continuing...\n", feat);
2678                 return 0;
2679         }
2680
2681         if (!feat_ops[feat].process)
2682                 return 0;
2683
2684         return feat_ops[feat].process(section, ph, fd, data);
2685 }
2686
2687 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2688                                        struct perf_header *ph, int fd,
2689                                        bool repipe)
2690 {
2691         ssize_t ret;
2692
2693         ret = readn(fd, header, sizeof(*header));
2694         if (ret <= 0)
2695                 return -1;
2696
2697         if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2698                 pr_debug("endian/magic failed\n");
2699                 return -1;
2700         }
2701
2702         if (ph->needs_swap)
2703                 header->size = bswap_64(header->size);
2704
2705         if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
2706                 return -1;
2707
2708         return 0;
2709 }
2710
2711 static int perf_header__read_pipe(struct perf_session *session)
2712 {
2713         struct perf_header *header = &session->header;
2714         struct perf_pipe_file_header f_header;
2715
2716         if (perf_file_header__read_pipe(&f_header, header,
2717                                         perf_data_file__fd(session->file),
2718                                         session->repipe) < 0) {
2719                 pr_debug("incompatible file format\n");
2720                 return -EINVAL;
2721         }
2722
2723         return 0;
2724 }
2725
2726 static int read_attr(int fd, struct perf_header *ph,
2727                      struct perf_file_attr *f_attr)
2728 {
2729         struct perf_event_attr *attr = &f_attr->attr;
2730         size_t sz, left;
2731         size_t our_sz = sizeof(f_attr->attr);
2732         ssize_t ret;
2733
2734         memset(f_attr, 0, sizeof(*f_attr));
2735
2736         /* read minimal guaranteed structure */
2737         ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2738         if (ret <= 0) {
2739                 pr_debug("cannot read %d bytes of header attr\n",
2740                          PERF_ATTR_SIZE_VER0);
2741                 return -1;
2742         }
2743
2744         /* on file perf_event_attr size */
2745         sz = attr->size;
2746
2747         if (ph->needs_swap)
2748                 sz = bswap_32(sz);
2749
2750         if (sz == 0) {
2751                 /* assume ABI0 */
2752                 sz =  PERF_ATTR_SIZE_VER0;
2753         } else if (sz > our_sz) {
2754                 pr_debug("file uses a more recent and unsupported ABI"
2755                          " (%zu bytes extra)\n", sz - our_sz);
2756                 return -1;
2757         }
2758         /* what we have not yet read and that we know about */
2759         left = sz - PERF_ATTR_SIZE_VER0;
2760         if (left) {
2761                 void *ptr = attr;
2762                 ptr += PERF_ATTR_SIZE_VER0;
2763
2764                 ret = readn(fd, ptr, left);
2765         }
2766         /* read perf_file_section, ids are read in caller */
2767         ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2768
2769         return ret <= 0 ? -1 : 0;
2770 }
2771
2772 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
2773                                                 struct pevent *pevent)
2774 {
2775         struct event_format *event;
2776         char bf[128];
2777
2778         /* already prepared */
2779         if (evsel->tp_format)
2780                 return 0;
2781
2782         if (pevent == NULL) {
2783                 pr_debug("broken or missing trace data\n");
2784                 return -1;
2785         }
2786
2787         event = pevent_find_event(pevent, evsel->attr.config);
2788         if (event == NULL)
2789                 return -1;
2790
2791         if (!evsel->name) {
2792                 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2793                 evsel->name = strdup(bf);
2794                 if (evsel->name == NULL)
2795                         return -1;
2796         }
2797
2798         evsel->tp_format = event;
2799         return 0;
2800 }
2801
2802 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
2803                                                   struct pevent *pevent)
2804 {
2805         struct perf_evsel *pos;
2806
2807         evlist__for_each(evlist, pos) {
2808                 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2809                     perf_evsel__prepare_tracepoint_event(pos, pevent))
2810                         return -1;
2811         }
2812
2813         return 0;
2814 }
2815
2816 int perf_session__read_header(struct perf_session *session)
2817 {
2818         struct perf_data_file *file = session->file;
2819         struct perf_header *header = &session->header;
2820         struct perf_file_header f_header;
2821         struct perf_file_attr   f_attr;
2822         u64                     f_id;
2823         int nr_attrs, nr_ids, i, j;
2824         int fd = perf_data_file__fd(file);
2825
2826         session->evlist = perf_evlist__new();
2827         if (session->evlist == NULL)
2828                 return -ENOMEM;
2829
2830         if (perf_data_file__is_pipe(file))
2831                 return perf_header__read_pipe(session);
2832
2833         if (perf_file_header__read(&f_header, header, fd) < 0)
2834                 return -EINVAL;
2835
2836         /*
2837          * Sanity check that perf.data was written cleanly; data size is
2838          * initialized to 0 and updated only if the on_exit function is run.
2839          * If data size is still 0 then the file contains only partial
2840          * information.  Just warn user and process it as much as it can.
2841          */
2842         if (f_header.data.size == 0) {
2843                 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
2844                            "Was the 'perf record' command properly terminated?\n",
2845                            file->path);
2846         }
2847
2848         nr_attrs = f_header.attrs.size / f_header.attr_size;
2849         lseek(fd, f_header.attrs.offset, SEEK_SET);
2850
2851         for (i = 0; i < nr_attrs; i++) {
2852                 struct perf_evsel *evsel;
2853                 off_t tmp;
2854
2855                 if (read_attr(fd, header, &f_attr) < 0)
2856                         goto out_errno;
2857
2858                 if (header->needs_swap)
2859                         perf_event__attr_swap(&f_attr.attr);
2860
2861                 tmp = lseek(fd, 0, SEEK_CUR);
2862                 evsel = perf_evsel__new(&f_attr.attr);
2863
2864                 if (evsel == NULL)
2865                         goto out_delete_evlist;
2866
2867                 evsel->needs_swap = header->needs_swap;
2868                 /*
2869                  * Do it before so that if perf_evsel__alloc_id fails, this
2870                  * entry gets purged too at perf_evlist__delete().
2871                  */
2872                 perf_evlist__add(session->evlist, evsel);
2873
2874                 nr_ids = f_attr.ids.size / sizeof(u64);
2875                 /*
2876                  * We don't have the cpu and thread maps on the header, so
2877                  * for allocating the perf_sample_id table we fake 1 cpu and
2878                  * hattr->ids threads.
2879                  */
2880                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2881                         goto out_delete_evlist;
2882
2883                 lseek(fd, f_attr.ids.offset, SEEK_SET);
2884
2885                 for (j = 0; j < nr_ids; j++) {
2886                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2887                                 goto out_errno;
2888
2889                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2890                 }
2891
2892                 lseek(fd, tmp, SEEK_SET);
2893         }
2894
2895         symbol_conf.nr_events = nr_attrs;
2896
2897         perf_header__process_sections(header, fd, &session->tevent,
2898                                       perf_file_section__process);
2899
2900         if (perf_evlist__prepare_tracepoint_events(session->evlist,
2901                                                    session->tevent.pevent))
2902                 goto out_delete_evlist;
2903
2904         return 0;
2905 out_errno:
2906         return -errno;
2907
2908 out_delete_evlist:
2909         perf_evlist__delete(session->evlist);
2910         session->evlist = NULL;
2911         return -ENOMEM;
2912 }
2913
2914 int perf_event__synthesize_attr(struct perf_tool *tool,
2915                                 struct perf_event_attr *attr, u32 ids, u64 *id,
2916                                 perf_event__handler_t process)
2917 {
2918         union perf_event *ev;
2919         size_t size;
2920         int err;
2921
2922         size = sizeof(struct perf_event_attr);
2923         size = PERF_ALIGN(size, sizeof(u64));
2924         size += sizeof(struct perf_event_header);
2925         size += ids * sizeof(u64);
2926
2927         ev = malloc(size);
2928
2929         if (ev == NULL)
2930                 return -ENOMEM;
2931
2932         ev->attr.attr = *attr;
2933         memcpy(ev->attr.id, id, ids * sizeof(u64));
2934
2935         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2936         ev->attr.header.size = (u16)size;
2937
2938         if (ev->attr.header.size == size)
2939                 err = process(tool, ev, NULL, NULL);
2940         else
2941                 err = -E2BIG;
2942
2943         free(ev);
2944
2945         return err;
2946 }
2947
2948 int perf_event__synthesize_attrs(struct perf_tool *tool,
2949                                    struct perf_session *session,
2950                                    perf_event__handler_t process)
2951 {
2952         struct perf_evsel *evsel;
2953         int err = 0;
2954
2955         evlist__for_each(session->evlist, evsel) {
2956                 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
2957                                                   evsel->id, process);
2958                 if (err) {
2959                         pr_debug("failed to create perf header attribute\n");
2960                         return err;
2961                 }
2962         }
2963
2964         return err;
2965 }
2966
2967 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
2968                              union perf_event *event,
2969                              struct perf_evlist **pevlist)
2970 {
2971         u32 i, ids, n_ids;
2972         struct perf_evsel *evsel;
2973         struct perf_evlist *evlist = *pevlist;
2974
2975         if (evlist == NULL) {
2976                 *pevlist = evlist = perf_evlist__new();
2977                 if (evlist == NULL)
2978                         return -ENOMEM;
2979         }
2980
2981         evsel = perf_evsel__new(&event->attr.attr);
2982         if (evsel == NULL)
2983                 return -ENOMEM;
2984
2985         perf_evlist__add(evlist, evsel);
2986
2987         ids = event->header.size;
2988         ids -= (void *)&event->attr.id - (void *)event;
2989         n_ids = ids / sizeof(u64);
2990         /*
2991          * We don't have the cpu and thread maps on the header, so
2992          * for allocating the perf_sample_id table we fake 1 cpu and
2993          * hattr->ids threads.
2994          */
2995         if (perf_evsel__alloc_id(evsel, 1, n_ids))
2996                 return -ENOMEM;
2997
2998         for (i = 0; i < n_ids; i++) {
2999                 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3000         }
3001
3002         symbol_conf.nr_events = evlist->nr_entries;
3003
3004         return 0;
3005 }
3006
3007 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3008                                         struct perf_evlist *evlist,
3009                                         perf_event__handler_t process)
3010 {
3011         union perf_event ev;
3012         struct tracing_data *tdata;
3013         ssize_t size = 0, aligned_size = 0, padding;
3014         int err __maybe_unused = 0;
3015
3016         /*
3017          * We are going to store the size of the data followed
3018          * by the data contents. Since the fd descriptor is a pipe,
3019          * we cannot seek back to store the size of the data once
3020          * we know it. Instead we:
3021          *
3022          * - write the tracing data to the temp file
3023          * - get/write the data size to pipe
3024          * - write the tracing data from the temp file
3025          *   to the pipe
3026          */
3027         tdata = tracing_data_get(&evlist->entries, fd, true);
3028         if (!tdata)
3029                 return -1;
3030
3031         memset(&ev, 0, sizeof(ev));
3032
3033         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3034         size = tdata->size;
3035         aligned_size = PERF_ALIGN(size, sizeof(u64));
3036         padding = aligned_size - size;
3037         ev.tracing_data.header.size = sizeof(ev.tracing_data);
3038         ev.tracing_data.size = aligned_size;
3039
3040         process(tool, &ev, NULL, NULL);
3041
3042         /*
3043          * The put function will copy all the tracing data
3044          * stored in temp file to the pipe.
3045          */
3046         tracing_data_put(tdata);
3047
3048         write_padded(fd, NULL, 0, padding);
3049
3050         return aligned_size;
3051 }
3052
3053 int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
3054                                      union perf_event *event,
3055                                      struct perf_session *session)
3056 {
3057         ssize_t size_read, padding, size = event->tracing_data.size;
3058         int fd = perf_data_file__fd(session->file);
3059         off_t offset = lseek(fd, 0, SEEK_CUR);
3060         char buf[BUFSIZ];
3061
3062         /* setup for reading amidst mmap */
3063         lseek(fd, offset + sizeof(struct tracing_data_event),
3064               SEEK_SET);
3065
3066         size_read = trace_report(fd, &session->tevent,
3067                                  session->repipe);
3068         padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3069
3070         if (readn(fd, buf, padding) < 0) {
3071                 pr_err("%s: reading input file", __func__);
3072                 return -1;
3073         }
3074         if (session->repipe) {
3075                 int retw = write(STDOUT_FILENO, buf, padding);
3076                 if (retw <= 0 || retw != padding) {
3077                         pr_err("%s: repiping tracing data padding", __func__);
3078                         return -1;
3079                 }
3080         }
3081
3082         if (size_read + padding != size) {
3083                 pr_err("%s: tracing data size mismatch", __func__);
3084                 return -1;
3085         }
3086
3087         perf_evlist__prepare_tracepoint_events(session->evlist,
3088                                                session->tevent.pevent);
3089
3090         return size_read + padding;
3091 }
3092
3093 int perf_event__synthesize_build_id(struct perf_tool *tool,
3094                                     struct dso *pos, u16 misc,
3095                                     perf_event__handler_t process,
3096                                     struct machine *machine)
3097 {
3098         union perf_event ev;
3099         size_t len;
3100         int err = 0;
3101
3102         if (!pos->hit)
3103                 return err;
3104
3105         memset(&ev, 0, sizeof(ev));
3106
3107         len = pos->long_name_len + 1;
3108         len = PERF_ALIGN(len, NAME_ALIGN);
3109         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3110         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3111         ev.build_id.header.misc = misc;
3112         ev.build_id.pid = machine->pid;
3113         ev.build_id.header.size = sizeof(ev.build_id) + len;
3114         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3115
3116         err = process(tool, &ev, NULL, machine);
3117
3118         return err;
3119 }
3120
3121 int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
3122                                  union perf_event *event,
3123                                  struct perf_session *session)
3124 {
3125         __event_process_build_id(&event->build_id,
3126                                  event->build_id.filename,
3127                                  session);
3128         return 0;
3129 }
3130
3131 void disable_buildid_cache(void)
3132 {
3133         no_buildid_cache = true;
3134 }