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 #include <api/fs/fs.h>
  27 #include "asm/bug.h"
  28
  29 /*
  30  * magic2 = "PERFILE2"
  31  * must be a numerical value to let the endianness
  32  * determine the memory layout. That way we are able
  33  * to detect endianness when reading the perf.data file
  34  * back.
  35  *
  36  * we check for legacy (PERFFILE) format.
  37  */
  38 static const char *__perf_magic1 = "PERFFILE";
  39 static const u64 __perf_magic2    = 0x32454c4946524550ULL;
  40 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
  41
  42 #define PERF_MAGIC      __perf_magic2
  43
  44 struct perf_file_attr {
  45         struct perf_event_attr  attr;
  46         struct perf_file_section        ids;
  47 };
  48
  49 void perf_header__set_feat(struct perf_header *header, int feat)
  50 {
  51         set_bit(feat, header->adds_features);
  52 }
  53
  54 void perf_header__clear_feat(struct perf_header *header, int feat)
  55 {
  56         clear_bit(feat, header->adds_features);
  57 }
  58
  59 bool perf_header__has_feat(const struct perf_header *header, int feat)
  60 {
  61         return test_bit(feat, header->adds_features);
  62 }
  63
  64 static int do_write(int fd, const void *buf, size_t size)
  65 {
  66         while (size) {
  67                 int ret = write(fd, buf, size);
  68
  69                 if (ret < 0)
  70                         return -errno;
  71
  72                 size -= ret;
  73                 buf += ret;
  74         }
  75
  76         return 0;
  77 }
  78
  79 int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
  80 {
  81         static const char zero_buf[NAME_ALIGN];
  82         int err = do_write(fd, bf, count);
  83
  84         if (!err)
  85                 err = do_write(fd, zero_buf, count_aligned - count);
  86
  87         return err;
  88 }
  89
  90 #define string_size(str)                                                \
  91         (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
  92
  93 static int do_write_string(int fd, const char *str)
  94 {
  95         u32 len, olen;
  96         int ret;
  97
  98         olen = strlen(str) + 1;
  99         len = PERF_ALIGN(olen, NAME_ALIGN);
 100
 101         /* write len, incl. \0 */
 102         ret = do_write(fd, &len, sizeof(len));
 103         if (ret < 0)
 104                 return ret;
 105
 106         return write_padded(fd, str, olen, len);
 107 }
 108
 109 static char *do_read_string(int fd, struct perf_header *ph)
 110 {
 111         ssize_t sz, ret;
 112         u32 len;
 113         char *buf;
 114
 115         sz = readn(fd, &len, sizeof(len));
 116         if (sz < (ssize_t)sizeof(len))
 117                 return NULL;
 118
 119         if (ph->needs_swap)
 120                 len = bswap_32(len);
 121
 122         buf = malloc(len);
 123         if (!buf)
 124                 return NULL;
 125
 126         ret = readn(fd, buf, len);
 127         if (ret == (ssize_t)len) {
 128                 /*
 129                  * strings are padded by zeroes
 130                  * thus the actual strlen of buf
 131                  * may be less than len
 132                  */
 133                 return buf;
 134         }
 135
 136         free(buf);
 137         return NULL;
 138 }
 139
 140 static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
 141                             struct perf_evlist *evlist)
 142 {
 143         return read_tracing_data(fd, &evlist->entries);
 144 }
 145
 146
 147 static int write_build_id(int fd, struct perf_header *h,
 148                           struct perf_evlist *evlist __maybe_unused)
 149 {
 150         struct perf_session *session;
 151         int err;
 152
 153         session = container_of(h, struct perf_session, header);
 154
 155         if (!perf_session__read_build_ids(session, true))
 156                 return -1;
 157
 158         err = perf_session__write_buildid_table(session, fd);
 159         if (err < 0) {
 160                 pr_debug("failed to write buildid table\n");
 161                 return err;
 162         }
 163         perf_session__cache_build_ids(session);
 164
 165         return 0;
 166 }
 167
 168 static int write_hostname(int fd, struct perf_header *h __maybe_unused,
 169                           struct perf_evlist *evlist __maybe_unused)
 170 {
 171         struct utsname uts;
 172         int ret;
 173
 174         ret = uname(&uts);
 175         if (ret < 0)
 176                 return -1;
 177
 178         return do_write_string(fd, uts.nodename);
 179 }
 180
 181 static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
 182                            struct perf_evlist *evlist __maybe_unused)
 183 {
 184         struct utsname uts;
 185         int ret;
 186
 187         ret = uname(&uts);
 188         if (ret < 0)
 189                 return -1;
 190
 191         return do_write_string(fd, uts.release);
 192 }
 193
 194 static int write_arch(int fd, struct perf_header *h __maybe_unused,
 195                       struct perf_evlist *evlist __maybe_unused)
 196 {
 197         struct utsname uts;
 198         int ret;
 199
 200         ret = uname(&uts);
 201         if (ret < 0)
 202                 return -1;
 203
 204         return do_write_string(fd, uts.machine);
 205 }
 206
 207 static int write_version(int fd, struct perf_header *h __maybe_unused,
 208                          struct perf_evlist *evlist __maybe_unused)
 209 {
 210         return do_write_string(fd, perf_version_string);
 211 }
 212
 213 static int __write_cpudesc(int fd, const char *cpuinfo_proc)
 214 {
 215         FILE *file;
 216         char *buf = NULL;
 217         char *s, *p;
 218         const char *search = cpuinfo_proc;
 219         size_t len = 0;
 220         int ret = -1;
 221
 222         if (!search)
 223                 return -1;
 224
 225         file = fopen("/proc/cpuinfo", "r");
 226         if (!file)
 227                 return -1;
 228
 229         while (getline(&buf, &len, file) > 0) {
 230                 ret = strncmp(buf, search, strlen(search));
 231                 if (!ret)
 232                         break;
 233         }
 234
 235         if (ret) {
 236                 ret = -1;
 237                 goto done;
 238         }
 239
 240         s = buf;
 241
 242         p = strchr(buf, ':');
 243         if (p && *(p+1) == ' ' && *(p+2))
 244                 s = p + 2;
 245         p = strchr(s, '\n');
 246         if (p)
 247                 *p = '\0';
 248
 249         /* squash extra space characters (branding string) */
 250         p = s;
 251         while (*p) {
 252                 if (isspace(*p)) {
 253                         char *r = p + 1;
 254                         char *q = r;
 255                         *p = ' ';
 256                         while (*q && isspace(*q))
 257                                 q++;
 258                         if (q != (p+1))
 259                                 while ((*r++ = *q++));
 260                 }
 261                 p++;
 262         }
 263         ret = do_write_string(fd, s);
 264 done:
 265         free(buf);
 266         fclose(file);
 267         return ret;
 268 }
 269
 270 static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
 271                        struct perf_evlist *evlist __maybe_unused)
 272 {
 273 #ifndef CPUINFO_PROC
 274 #define CPUINFO_PROC {"model name", }
 275 #endif
 276         const char *cpuinfo_procs[] = CPUINFO_PROC;
 277         unsigned int i;
 278
 279         for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
 280                 int ret;
 281                 ret = __write_cpudesc(fd, cpuinfo_procs[i]);
 282                 if (ret >= 0)
 283                         return ret;
 284         }
 285         return -1;
 286 }
 287
 288
 289 static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
 290                         struct perf_evlist *evlist __maybe_unused)
 291 {
 292         long nr;
 293         u32 nrc, nra;
 294         int ret;
 295
 296         nr = sysconf(_SC_NPROCESSORS_CONF);
 297         if (nr < 0)
 298                 return -1;
 299
 300         nrc = (u32)(nr & UINT_MAX);
 301
 302         nr = sysconf(_SC_NPROCESSORS_ONLN);
 303         if (nr < 0)
 304                 return -1;
 305
 306         nra = (u32)(nr & UINT_MAX);
 307
 308         ret = do_write(fd, &nrc, sizeof(nrc));
 309         if (ret < 0)
 310                 return ret;
 311
 312         return do_write(fd, &nra, sizeof(nra));
 313 }
 314
 315 static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
 316                             struct perf_evlist *evlist)
 317 {
 318         struct perf_evsel *evsel;
 319         u32 nre, nri, sz;
 320         int ret;
 321
 322         nre = evlist->nr_entries;
 323
 324         /*
 325          * write number of events
 326          */
 327         ret = do_write(fd, &nre, sizeof(nre));
 328         if (ret < 0)
 329                 return ret;
 330
 331         /*
 332          * size of perf_event_attr struct
 333          */
 334         sz = (u32)sizeof(evsel->attr);
 335         ret = do_write(fd, &sz, sizeof(sz));
 336         if (ret < 0)
 337                 return ret;
 338
 339         evlist__for_each(evlist, evsel) {
 340                 ret = do_write(fd, &evsel->attr, sz);
 341                 if (ret < 0)
 342                         return ret;
 343                 /*
 344                  * write number of unique id per event
 345                  * there is one id per instance of an event
 346                  *
 347                  * copy into an nri to be independent of the
 348                  * type of ids,
 349                  */
 350                 nri = evsel->ids;
 351                 ret = do_write(fd, &nri, sizeof(nri));
 352                 if (ret < 0)
 353                         return ret;
 354
 355                 /*
 356                  * write event string as passed on cmdline
 357                  */
 358                 ret = do_write_string(fd, perf_evsel__name(evsel));
 359                 if (ret < 0)
 360                         return ret;
 361                 /*
 362                  * write unique ids for this event
 363                  */
 364                 ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
 365                 if (ret < 0)
 366                         return ret;
 367         }
 368         return 0;
 369 }
 370
 371 static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 372                          struct perf_evlist *evlist __maybe_unused)
 373 {
 374         char buf[MAXPATHLEN];
 375         char proc[32];
 376         u32 n;
 377         int i, ret;
 378
 379         /*
 380          * actual atual path to perf binary
 381          */
 382         sprintf(proc, "/proc/%d/exe", getpid());
 383         ret = readlink(proc, buf, sizeof(buf));
 384         if (ret <= 0)
 385                 return -1;
 386
 387         /* readlink() does not add null termination */
 388         buf[ret] = '\0';
 389
 390         /* account for binary path */
 391         n = perf_env.nr_cmdline + 1;
 392
 393         ret = do_write(fd, &n, sizeof(n));
 394         if (ret < 0)
 395                 return ret;
 396
 397         ret = do_write_string(fd, buf);
 398         if (ret < 0)
 399                 return ret;
 400
 401         for (i = 0 ; i < perf_env.nr_cmdline; i++) {
 402                 ret = do_write_string(fd, perf_env.cmdline_argv[i]);
 403                 if (ret < 0)
 404                         return ret;
 405         }
 406         return 0;
 407 }
 408
 409 #define CORE_SIB_FMT \
 410         "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
 411 #define THRD_SIB_FMT \
 412         "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
 413
 414 struct cpu_topo {
 415         u32 cpu_nr;
 416         u32 core_sib;
 417         u32 thread_sib;
 418         char **core_siblings;
 419         char **thread_siblings;
 420 };
 421
 422 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
 423 {
 424         FILE *fp;
 425         char filename[MAXPATHLEN];
 426         char *buf = NULL, *p;
 427         size_t len = 0;
 428         ssize_t sret;
 429         u32 i = 0;
 430         int ret = -1;
 431
 432         sprintf(filename, CORE_SIB_FMT, cpu);
 433         fp = fopen(filename, "r");
 434         if (!fp)
 435                 goto try_threads;
 436
 437         sret = getline(&buf, &len, fp);
 438         fclose(fp);
 439         if (sret <= 0)
 440                 goto try_threads;
 441
 442         p = strchr(buf, '\n');
 443         if (p)
 444                 *p = '\0';
 445
 446         for (i = 0; i < tp->core_sib; i++) {
 447                 if (!strcmp(buf, tp->core_siblings[i]))
 448                         break;
 449         }
 450         if (i == tp->core_sib) {
 451                 tp->core_siblings[i] = buf;
 452                 tp->core_sib++;
 453                 buf = NULL;
 454                 len = 0;
 455         }
 456         ret = 0;
 457
 458 try_threads:
 459         sprintf(filename, THRD_SIB_FMT, cpu);
 460         fp = fopen(filename, "r");
 461         if (!fp)
 462                 goto done;
 463
 464         if (getline(&buf, &len, fp) <= 0)
 465                 goto done;
 466
 467         p = strchr(buf, '\n');
 468         if (p)
 469                 *p = '\0';
 470
 471         for (i = 0; i < tp->thread_sib; i++) {
 472                 if (!strcmp(buf, tp->thread_siblings[i]))
 473                         break;
 474         }
 475         if (i == tp->thread_sib) {
 476                 tp->thread_siblings[i] = buf;
 477                 tp->thread_sib++;
 478                 buf = NULL;
 479         }
 480         ret = 0;
 481 done:
 482         if(fp)
 483                 fclose(fp);
 484         free(buf);
 485         return ret;
 486 }
 487
 488 static void free_cpu_topo(struct cpu_topo *tp)
 489 {
 490         u32 i;
 491
 492         if (!tp)
 493                 return;
 494
 495         for (i = 0 ; i < tp->core_sib; i++)
 496                 zfree(&tp->core_siblings[i]);
 497
 498         for (i = 0 ; i < tp->thread_sib; i++)
 499                 zfree(&tp->thread_siblings[i]);
 500
 501         free(tp);
 502 }
 503
 504 static struct cpu_topo *build_cpu_topology(void)
 505 {
 506         struct cpu_topo *tp;
 507         void *addr;
 508         u32 nr, i;
 509         size_t sz;
 510         long ncpus;
 511         int ret = -1;
 512
 513         ncpus = sysconf(_SC_NPROCESSORS_CONF);
 514         if (ncpus < 0)
 515                 return NULL;
 516
 517         nr = (u32)(ncpus & UINT_MAX);
 518
 519         sz = nr * sizeof(char *);
 520
 521         addr = calloc(1, sizeof(*tp) + 2 * sz);
 522         if (!addr)
 523                 return NULL;
 524
 525         tp = addr;
 526         tp->cpu_nr = nr;
 527         addr += sizeof(*tp);
 528         tp->core_siblings = addr;
 529         addr += sz;
 530         tp->thread_siblings = addr;
 531
 532         for (i = 0; i < nr; i++) {
 533                 ret = build_cpu_topo(tp, i);
 534                 if (ret < 0)
 535                         break;
 536         }
 537         if (ret) {
 538                 free_cpu_topo(tp);
 539                 tp = NULL;
 540         }
 541         return tp;
 542 }
 543
 544 static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
 545                           struct perf_evlist *evlist __maybe_unused)
 546 {
 547         struct cpu_topo *tp;
 548         u32 i;
 549         int ret, j;
 550
 551         tp = build_cpu_topology();
 552         if (!tp)
 553                 return -1;
 554
 555         ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
 556         if (ret < 0)
 557                 goto done;
 558
 559         for (i = 0; i < tp->core_sib; i++) {
 560                 ret = do_write_string(fd, tp->core_siblings[i]);
 561                 if (ret < 0)
 562                         goto done;
 563         }
 564         ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
 565         if (ret < 0)
 566                 goto done;
 567
 568         for (i = 0; i < tp->thread_sib; i++) {
 569                 ret = do_write_string(fd, tp->thread_siblings[i]);
 570                 if (ret < 0)
 571                         break;
 572         }
 573
 574         ret = perf_env__read_cpu_topology_map(&perf_env);
 575         if (ret < 0)
 576                 goto done;
 577
 578         for (j = 0; j < perf_env.nr_cpus_avail; j++) {
 579                 ret = do_write(fd, &perf_env.cpu[j].core_id,
 580                                sizeof(perf_env.cpu[j].core_id));
 581                 if (ret < 0)
 582                         return ret;
 583                 ret = do_write(fd, &perf_env.cpu[j].socket_id,
 584                                sizeof(perf_env.cpu[j].socket_id));
 585                 if (ret < 0)
 586                         return ret;
 587         }
 588 done:
 589         free_cpu_topo(tp);
 590         return ret;
 591 }
 592
 593
 594
 595 static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
 596                           struct perf_evlist *evlist __maybe_unused)
 597 {
 598         char *buf = NULL;
 599         FILE *fp;
 600         size_t len = 0;
 601         int ret = -1, n;
 602         uint64_t mem;
 603
 604         fp = fopen("/proc/meminfo", "r");
 605         if (!fp)
 606                 return -1;
 607
 608         while (getline(&buf, &len, fp) > 0) {
 609                 ret = strncmp(buf, "MemTotal:", 9);
 610                 if (!ret)
 611                         break;
 612         }
 613         if (!ret) {
 614                 n = sscanf(buf, "%*s %"PRIu64, &mem);
 615                 if (n == 1)
 616                         ret = do_write(fd, &mem, sizeof(mem));
 617         } else
 618                 ret = -1;
 619         free(buf);
 620         fclose(fp);
 621         return ret;
 622 }
 623
 624 static int write_topo_node(int fd, int node)
 625 {
 626         char str[MAXPATHLEN];
 627         char field[32];
 628         char *buf = NULL, *p;
 629         size_t len = 0;
 630         FILE *fp;
 631         u64 mem_total, mem_free, mem;
 632         int ret = -1;
 633
 634         sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
 635         fp = fopen(str, "r");
 636         if (!fp)
 637                 return -1;
 638
 639         while (getline(&buf, &len, fp) > 0) {
 640                 /* skip over invalid lines */
 641                 if (!strchr(buf, ':'))
 642                         continue;
 643                 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
 644                         goto done;
 645                 if (!strcmp(field, "MemTotal:"))
 646                         mem_total = mem;
 647                 if (!strcmp(field, "MemFree:"))
 648                         mem_free = mem;
 649         }
 650
 651         fclose(fp);
 652         fp = NULL;
 653
 654         ret = do_write(fd, &mem_total, sizeof(u64));
 655         if (ret)
 656                 goto done;
 657
 658         ret = do_write(fd, &mem_free, sizeof(u64));
 659         if (ret)
 660                 goto done;
 661
 662         ret = -1;
 663         sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
 664
 665         fp = fopen(str, "r");
 666         if (!fp)
 667                 goto done;
 668
 669         if (getline(&buf, &len, fp) <= 0)
 670                 goto done;
 671
 672         p = strchr(buf, '\n');
 673         if (p)
 674                 *p = '\0';
 675
 676         ret = do_write_string(fd, buf);
 677 done:
 678         free(buf);
 679         if (fp)
 680                 fclose(fp);
 681         return ret;
 682 }
 683
 684 static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
 685                           struct perf_evlist *evlist __maybe_unused)
 686 {
 687         char *buf = NULL;
 688         size_t len = 0;
 689         FILE *fp;
 690         struct cpu_map *node_map = NULL;
 691         char *c;
 692         u32 nr, i, j;
 693         int ret = -1;
 694
 695         fp = fopen("/sys/devices/system/node/online", "r");
 696         if (!fp)
 697                 return -1;
 698
 699         if (getline(&buf, &len, fp) <= 0)
 700                 goto done;
 701
 702         c = strchr(buf, '\n');
 703         if (c)
 704                 *c = '\0';
 705
 706         node_map = cpu_map__new(buf);
 707         if (!node_map)
 708                 goto done;
 709
 710         nr = (u32)node_map->nr;
 711
 712         ret = do_write(fd, &nr, sizeof(nr));
 713         if (ret < 0)
 714                 goto done;
 715
 716         for (i = 0; i < nr; i++) {
 717                 j = (u32)node_map->map[i];
 718                 ret = do_write(fd, &j, sizeof(j));
 719                 if (ret < 0)
 720                         break;
 721
 722                 ret = write_topo_node(fd, i);
 723                 if (ret < 0)
 724                         break;
 725         }
 726 done:
 727         free(buf);
 728         fclose(fp);
 729         cpu_map__put(node_map);
 730         return ret;
 731 }
 732
 733 /*
 734  * File format:
 735  *
 736  * struct pmu_mappings {
 737  *      u32     pmu_num;
 738  *      struct pmu_map {
 739  *              u32     type;
 740  *              char    name[];
 741  *      }[pmu_num];
 742  * };
 743  */
 744
 745 static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
 746                               struct perf_evlist *evlist __maybe_unused)
 747 {
 748         struct perf_pmu *pmu = NULL;
 749         off_t offset = lseek(fd, 0, SEEK_CUR);
 750         __u32 pmu_num = 0;
 751         int ret;
 752
 753         /* write real pmu_num later */
 754         ret = do_write(fd, &pmu_num, sizeof(pmu_num));
 755         if (ret < 0)
 756                 return ret;
 757
 758         while ((pmu = perf_pmu__scan(pmu))) {
 759                 if (!pmu->name)
 760                         continue;
 761                 pmu_num++;
 762
 763                 ret = do_write(fd, &pmu->type, sizeof(pmu->type));
 764                 if (ret < 0)
 765                         return ret;
 766
 767                 ret = do_write_string(fd, pmu->name);
 768                 if (ret < 0)
 769                         return ret;
 770         }
 771
 772         if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
 773                 /* discard all */
 774                 lseek(fd, offset, SEEK_SET);
 775                 return -1;
 776         }
 777
 778         return 0;
 779 }
 780
 781 /*
 782  * File format:
 783  *
 784  * struct group_descs {
 785  *      u32     nr_groups;
 786  *      struct group_desc {
 787  *              char    name[];
 788  *              u32     leader_idx;
 789  *              u32     nr_members;
 790  *      }[nr_groups];
 791  * };
 792  */
 793 static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
 794                             struct perf_evlist *evlist)
 795 {
 796         u32 nr_groups = evlist->nr_groups;
 797         struct perf_evsel *evsel;
 798         int ret;
 799
 800         ret = do_write(fd, &nr_groups, sizeof(nr_groups));
 801         if (ret < 0)
 802                 return ret;
 803
 804         evlist__for_each(evlist, evsel) {
 805                 if (perf_evsel__is_group_leader(evsel) &&
 806                     evsel->nr_members > 1) {
 807                         const char *name = evsel->group_name ?: "{anon_group}";
 808                         u32 leader_idx = evsel->idx;
 809                         u32 nr_members = evsel->nr_members;
 810
 811                         ret = do_write_string(fd, name);
 812                         if (ret < 0)
 813                                 return ret;
 814
 815                         ret = do_write(fd, &leader_idx, sizeof(leader_idx));
 816                         if (ret < 0)
 817                                 return ret;
 818
 819                         ret = do_write(fd, &nr_members, sizeof(nr_members));
 820                         if (ret < 0)
 821                                 return ret;
 822                 }
 823         }
 824         return 0;
 825 }
 826
 827 /*
 828  * default get_cpuid(): nothing gets recorded
 829  * actual implementation must be in arch/$(ARCH)/util/header.c
 830  */
 831 int __attribute__ ((weak)) get_cpuid(char *buffer __maybe_unused,
 832                                      size_t sz __maybe_unused)
 833 {
 834         return -1;
 835 }
 836
 837 static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
 838                        struct perf_evlist *evlist __maybe_unused)
 839 {
 840         char buffer[64];
 841         int ret;
 842
 843         ret = get_cpuid(buffer, sizeof(buffer));
 844         if (!ret)
 845                 goto write_it;
 846
 847         return -1;
 848 write_it:
 849         return do_write_string(fd, buffer);
 850 }
 851
 852 static int write_branch_stack(int fd __maybe_unused,
 853                               struct perf_header *h __maybe_unused,
 854                        struct perf_evlist *evlist __maybe_unused)
 855 {
 856         return 0;
 857 }
 858
 859 static int write_auxtrace(int fd, struct perf_header *h,
 860                           struct perf_evlist *evlist __maybe_unused)
 861 {
 862         struct perf_session *session;
 863         int err;
 864
 865         session = container_of(h, struct perf_session, header);
 866
 867         err = auxtrace_index__write(fd, &session->auxtrace_index);
 868         if (err < 0)
 869                 pr_err("Failed to write auxtrace index\n");
 870         return err;
 871 }
 872
 873 static int cpu_cache_level__sort(const void *a, const void *b)
 874 {
 875         struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
 876         struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
 877
 878         return cache_a->level - cache_b->level;
 879 }
 880
 881 static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
 882 {
 883         if (a->level != b->level)
 884                 return false;
 885
 886         if (a->line_size != b->line_size)
 887                 return false;
 888
 889         if (a->sets != b->sets)
 890                 return false;
 891
 892         if (a->ways != b->ways)
 893                 return false;
 894
 895         if (strcmp(a->type, b->type))
 896                 return false;
 897
 898         if (strcmp(a->size, b->size))
 899                 return false;
 900
 901         if (strcmp(a->map, b->map))
 902                 return false;
 903
 904         return true;
 905 }
 906
 907 static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
 908 {
 909         char path[PATH_MAX], file[PATH_MAX];
 910         struct stat st;
 911         size_t len;
 912
 913         scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
 914         scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
 915
 916         if (stat(file, &st))
 917                 return 1;
 918
 919         scnprintf(file, PATH_MAX, "%s/level", path);
 920         if (sysfs__read_int(file, (int *) &cache->level))
 921                 return -1;
 922
 923         scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
 924         if (sysfs__read_int(file, (int *) &cache->line_size))
 925                 return -1;
 926
 927         scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
 928         if (sysfs__read_int(file, (int *) &cache->sets))
 929                 return -1;
 930
 931         scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
 932         if (sysfs__read_int(file, (int *) &cache->ways))
 933                 return -1;
 934
 935         scnprintf(file, PATH_MAX, "%s/type", path);
 936         if (sysfs__read_str(file, &cache->type, &len))
 937                 return -1;
 938
 939         cache->type[len] = 0;
 940         cache->type = rtrim(cache->type);
 941
 942         scnprintf(file, PATH_MAX, "%s/size", path);
 943         if (sysfs__read_str(file, &cache->size, &len)) {
 944                 free(cache->type);
 945                 return -1;
 946         }
 947
 948         cache->size[len] = 0;
 949         cache->size = rtrim(cache->size);
 950
 951         scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
 952         if (sysfs__read_str(file, &cache->map, &len)) {
 953                 free(cache->map);
 954                 free(cache->type);
 955                 return -1;
 956         }
 957
 958         cache->map[len] = 0;
 959         cache->map = rtrim(cache->map);
 960         return 0;
 961 }
 962
 963 static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
 964 {
 965         fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
 966 }
 967
 968 static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
 969 {
 970         u32 i, cnt = 0;
 971         long ncpus;
 972         u32 nr, cpu;
 973         u16 level;
 974
 975         ncpus = sysconf(_SC_NPROCESSORS_CONF);
 976         if (ncpus < 0)
 977                 return -1;
 978
 979         nr = (u32)(ncpus & UINT_MAX);
 980
 981         for (cpu = 0; cpu < nr; cpu++) {
 982                 for (level = 0; level < 10; level++) {
 983                         struct cpu_cache_level c;
 984                         int err;
 985
 986                         err = cpu_cache_level__read(&c, cpu, level);
 987                         if (err < 0)
 988                                 return err;
 989
 990                         if (err == 1)
 991                                 break;
 992
 993                         for (i = 0; i < cnt; i++) {
 994                                 if (cpu_cache_level__cmp(&c, &caches[i]))
 995                                         break;
 996                         }
 997
 998                         if (i == cnt)
 999                                 caches[cnt++] = c;
1000                         else
1001                                 cpu_cache_level__free(&c);
1002
1003                         if (WARN_ONCE(cnt == size, "way too many cpu caches.."))
1004                                 goto out;
1005                 }
1006         }
1007  out:
1008         *cntp = cnt;
1009         return 0;
1010 }
1011
1012 #define MAX_CACHES 2000
1013
1014 static int write_cache(int fd, struct perf_header *h __maybe_unused,
1015                           struct perf_evlist *evlist __maybe_unused)
1016 {
1017         struct cpu_cache_level caches[MAX_CACHES];
1018         u32 cnt = 0, i, version = 1;
1019         int ret;
1020
1021         ret = build_caches(caches, MAX_CACHES, &cnt);
1022         if (ret)
1023                 goto out;
1024
1025         qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1026
1027         ret = do_write(fd, &version, sizeof(u32));
1028         if (ret < 0)
1029                 goto out;
1030
1031         ret = do_write(fd, &cnt, sizeof(u32));
1032         if (ret < 0)
1033                 goto out;
1034
1035         for (i = 0; i < cnt; i++) {
1036                 struct cpu_cache_level *c = &caches[i];
1037
1038                 #define _W(v)                                   \
1039                         ret = do_write(fd, &c->v, sizeof(u32)); \
1040                         if (ret < 0)                            \
1041                                 goto out;
1042
1043                 _W(level)
1044                 _W(line_size)
1045                 _W(sets)
1046                 _W(ways)
1047                 #undef _W
1048
1049                 #define _W(v)                                           \
1050                         ret = do_write_string(fd, (const char *) c->v); \
1051                         if (ret < 0)                                    \
1052                                 goto out;
1053
1054                 _W(type)
1055                 _W(size)
1056                 _W(map)
1057                 #undef _W
1058         }
1059
1060 out:
1061         for (i = 0; i < cnt; i++)
1062                 cpu_cache_level__free(&caches[i]);
1063         return ret;
1064 }
1065
1066 static int write_stat(int fd __maybe_unused,
1067                       struct perf_header *h __maybe_unused,
1068                       struct perf_evlist *evlist __maybe_unused)
1069 {
1070         return 0;
1071 }
1072
1073 static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
1074                            FILE *fp)
1075 {
1076         fprintf(fp, "# hostname : %s\n", ph->env.hostname);
1077 }
1078
1079 static void print_osrelease(struct perf_header *ph, int fd __maybe_unused,
1080                             FILE *fp)
1081 {
1082         fprintf(fp, "# os release : %s\n", ph->env.os_release);
1083 }
1084
1085 static void print_arch(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1086 {
1087         fprintf(fp, "# arch : %s\n", ph->env.arch);
1088 }
1089
1090 static void print_cpudesc(struct perf_header *ph, int fd __maybe_unused,
1091                           FILE *fp)
1092 {
1093         fprintf(fp, "# cpudesc : %s\n", ph->env.cpu_desc);
1094 }
1095
1096 static void print_nrcpus(struct perf_header *ph, int fd __maybe_unused,
1097                          FILE *fp)
1098 {
1099         fprintf(fp, "# nrcpus online : %u\n", ph->env.nr_cpus_online);
1100         fprintf(fp, "# nrcpus avail : %u\n", ph->env.nr_cpus_avail);
1101 }
1102
1103 static void print_version(struct perf_header *ph, int fd __maybe_unused,
1104                           FILE *fp)
1105 {
1106         fprintf(fp, "# perf version : %s\n", ph->env.version);
1107 }
1108
1109 static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
1110                           FILE *fp)
1111 {
1112         int nr, i;
1113
1114         nr = ph->env.nr_cmdline;
1115
1116         fprintf(fp, "# cmdline : ");
1117
1118         for (i = 0; i < nr; i++)
1119                 fprintf(fp, "%s ", ph->env.cmdline_argv[i]);
1120         fputc('\n', fp);
1121 }
1122
1123 static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
1124                                FILE *fp)
1125 {
1126         int nr, i;
1127         char *str;
1128         int cpu_nr = ph->env.nr_cpus_online;
1129
1130         nr = ph->env.nr_sibling_cores;
1131         str = ph->env.sibling_cores;
1132
1133         for (i = 0; i < nr; i++) {
1134                 fprintf(fp, "# sibling cores   : %s\n", str);
1135                 str += strlen(str) + 1;
1136         }
1137
1138         nr = ph->env.nr_sibling_threads;
1139         str = ph->env.sibling_threads;
1140
1141         for (i = 0; i < nr; i++) {
1142                 fprintf(fp, "# sibling threads : %s\n", str);
1143                 str += strlen(str) + 1;
1144         }
1145
1146         if (ph->env.cpu != NULL) {
1147                 for (i = 0; i < cpu_nr; i++)
1148                         fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
1149                                 ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
1150         } else
1151                 fprintf(fp, "# Core ID and Socket ID information is not available\n");
1152 }
1153
1154 static void free_event_desc(struct perf_evsel *events)
1155 {
1156         struct perf_evsel *evsel;
1157
1158         if (!events)
1159                 return;
1160
1161         for (evsel = events; evsel->attr.size; evsel++) {
1162                 zfree(&evsel->name);
1163                 zfree(&evsel->id);
1164         }
1165
1166         free(events);
1167 }
1168
1169 static struct perf_evsel *
1170 read_event_desc(struct perf_header *ph, int fd)
1171 {
1172         struct perf_evsel *evsel, *events = NULL;
1173         u64 *id;
1174         void *buf = NULL;
1175         u32 nre, sz, nr, i, j;
1176         ssize_t ret;
1177         size_t msz;
1178
1179         /* number of events */
1180         ret = readn(fd, &nre, sizeof(nre));
1181         if (ret != (ssize_t)sizeof(nre))
1182                 goto error;
1183
1184         if (ph->needs_swap)
1185                 nre = bswap_32(nre);
1186
1187         ret = readn(fd, &sz, sizeof(sz));
1188         if (ret != (ssize_t)sizeof(sz))
1189                 goto error;
1190
1191         if (ph->needs_swap)
1192                 sz = bswap_32(sz);
1193
1194         /* buffer to hold on file attr struct */
1195         buf = malloc(sz);
1196         if (!buf)
1197                 goto error;
1198
1199         /* the last event terminates with evsel->attr.size == 0: */
1200         events = calloc(nre + 1, sizeof(*events));
1201         if (!events)
1202                 goto error;
1203
1204         msz = sizeof(evsel->attr);
1205         if (sz < msz)
1206                 msz = sz;
1207
1208         for (i = 0, evsel = events; i < nre; evsel++, i++) {
1209                 evsel->idx = i;
1210
1211                 /*
1212                  * must read entire on-file attr struct to
1213                  * sync up with layout.
1214                  */
1215                 ret = readn(fd, buf, sz);
1216                 if (ret != (ssize_t)sz)
1217                         goto error;
1218
1219                 if (ph->needs_swap)
1220                         perf_event__attr_swap(buf);
1221
1222                 memcpy(&evsel->attr, buf, msz);
1223
1224                 ret = readn(fd, &nr, sizeof(nr));
1225                 if (ret != (ssize_t)sizeof(nr))
1226                         goto error;
1227
1228                 if (ph->needs_swap) {
1229                         nr = bswap_32(nr);
1230                         evsel->needs_swap = true;
1231                 }
1232
1233                 evsel->name = do_read_string(fd, ph);
1234
1235                 if (!nr)
1236                         continue;
1237
1238                 id = calloc(nr, sizeof(*id));
1239                 if (!id)
1240                         goto error;
1241                 evsel->ids = nr;
1242                 evsel->id = id;
1243
1244                 for (j = 0 ; j < nr; j++) {
1245                         ret = readn(fd, id, sizeof(*id));
1246                         if (ret != (ssize_t)sizeof(*id))
1247                                 goto error;
1248                         if (ph->needs_swap)
1249                                 *id = bswap_64(*id);
1250                         id++;
1251                 }
1252         }
1253 out:
1254         free(buf);
1255         return events;
1256 error:
1257         free_event_desc(events);
1258         events = NULL;
1259         goto out;
1260 }
1261
1262 static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1263                                 void *priv __attribute__((unused)))
1264 {
1265         return fprintf(fp, ", %s = %s", name, val);
1266 }
1267
1268 static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1269 {
1270         struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
1271         u32 j;
1272         u64 *id;
1273
1274         if (!events) {
1275                 fprintf(fp, "# event desc: not available or unable to read\n");
1276                 return;
1277         }
1278
1279         for (evsel = events; evsel->attr.size; evsel++) {
1280                 fprintf(fp, "# event : name = %s, ", evsel->name);
1281
1282                 if (evsel->ids) {
1283                         fprintf(fp, ", id = {");
1284                         for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1285                                 if (j)
1286                                         fputc(',', fp);
1287                                 fprintf(fp, " %"PRIu64, *id);
1288                         }
1289                         fprintf(fp, " }");
1290                 }
1291
1292                 perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1293
1294                 fputc('\n', fp);
1295         }
1296
1297         free_event_desc(events);
1298 }
1299
1300 static void print_total_mem(struct perf_header *ph, int fd __maybe_unused,
1301                             FILE *fp)
1302 {
1303         fprintf(fp, "# total memory : %Lu kB\n", ph->env.total_mem);
1304 }
1305
1306 static void print_numa_topology(struct perf_header *ph, int fd __maybe_unused,
1307                                 FILE *fp)
1308 {
1309         u32 nr, c, i;
1310         char *str, *tmp;
1311         uint64_t mem_total, mem_free;
1312
1313         /* nr nodes */
1314         nr = ph->env.nr_numa_nodes;
1315         str = ph->env.numa_nodes;
1316
1317         for (i = 0; i < nr; i++) {
1318                 /* node number */
1319                 c = strtoul(str, &tmp, 0);
1320                 if (*tmp != ':')
1321                         goto error;
1322
1323                 str = tmp + 1;
1324                 mem_total = strtoull(str, &tmp, 0);
1325                 if (*tmp != ':')
1326                         goto error;
1327
1328                 str = tmp + 1;
1329                 mem_free = strtoull(str, &tmp, 0);
1330                 if (*tmp != ':')
1331                         goto error;
1332
1333                 fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
1334                             " free = %"PRIu64" kB\n",
1335                         c, mem_total, mem_free);
1336
1337                 str = tmp + 1;
1338                 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1339
1340                 str += strlen(str) + 1;
1341         }
1342         return;
1343 error:
1344         fprintf(fp, "# numa topology : not available\n");
1345 }
1346
1347 static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1348 {
1349         fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
1350 }
1351
1352 static void print_branch_stack(struct perf_header *ph __maybe_unused,
1353                                int fd __maybe_unused, FILE *fp)
1354 {
1355         fprintf(fp, "# contains samples with branch stack\n");
1356 }
1357
1358 static void print_auxtrace(struct perf_header *ph __maybe_unused,
1359                            int fd __maybe_unused, FILE *fp)
1360 {
1361         fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1362 }
1363
1364 static void print_stat(struct perf_header *ph __maybe_unused,
1365                        int fd __maybe_unused, FILE *fp)
1366 {
1367         fprintf(fp, "# contains stat data\n");
1368 }
1369
1370 static void print_cache(struct perf_header *ph __maybe_unused,
1371                         int fd __maybe_unused, FILE *fp __maybe_unused)
1372 {
1373         int i;
1374
1375         fprintf(fp, "# CPU cache info:\n");
1376         for (i = 0; i < ph->env.caches_cnt; i++) {
1377                 fprintf(fp, "#  ");
1378                 cpu_cache_level__fprintf(fp, &ph->env.caches[i]);
1379         }
1380 }
1381
1382 static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
1383                                FILE *fp)
1384 {
1385         const char *delimiter = "# pmu mappings: ";
1386         char *str, *tmp;
1387         u32 pmu_num;
1388         u32 type;
1389
1390         pmu_num = ph->env.nr_pmu_mappings;
1391         if (!pmu_num) {
1392                 fprintf(fp, "# pmu mappings: not available\n");
1393                 return;
1394         }
1395
1396         str = ph->env.pmu_mappings;
1397
1398         while (pmu_num) {
1399                 type = strtoul(str, &tmp, 0);
1400                 if (*tmp != ':')
1401                         goto error;
1402
1403                 str = tmp + 1;
1404                 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1405
1406                 delimiter = ", ";
1407                 str += strlen(str) + 1;
1408                 pmu_num--;
1409         }
1410
1411         fprintf(fp, "\n");
1412
1413         if (!pmu_num)
1414                 return;
1415 error:
1416         fprintf(fp, "# pmu mappings: unable to read\n");
1417 }
1418
1419 static void print_group_desc(struct perf_header *ph, int fd __maybe_unused,
1420                              FILE *fp)
1421 {
1422         struct perf_session *session;
1423         struct perf_evsel *evsel;
1424         u32 nr = 0;
1425
1426         session = container_of(ph, struct perf_session, header);
1427
1428         evlist__for_each(session->evlist, evsel) {
1429                 if (perf_evsel__is_group_leader(evsel) &&
1430                     evsel->nr_members > 1) {
1431                         fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1432                                 perf_evsel__name(evsel));
1433
1434                         nr = evsel->nr_members - 1;
1435                 } else if (nr) {
1436                         fprintf(fp, ",%s", perf_evsel__name(evsel));
1437
1438                         if (--nr == 0)
1439                                 fprintf(fp, "}\n");
1440                 }
1441         }
1442 }
1443
1444 static int __event_process_build_id(struct build_id_event *bev,
1445                                     char *filename,
1446                                     struct perf_session *session)
1447 {
1448         int err = -1;
1449         struct machine *machine;
1450         u16 cpumode;
1451         struct dso *dso;
1452         enum dso_kernel_type dso_type;
1453
1454         machine = perf_session__findnew_machine(session, bev->pid);
1455         if (!machine)
1456                 goto out;
1457
1458         cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1459
1460         switch (cpumode) {
1461         case PERF_RECORD_MISC_KERNEL:
1462                 dso_type = DSO_TYPE_KERNEL;
1463                 break;
1464         case PERF_RECORD_MISC_GUEST_KERNEL:
1465                 dso_type = DSO_TYPE_GUEST_KERNEL;
1466                 break;
1467         case PERF_RECORD_MISC_USER:
1468         case PERF_RECORD_MISC_GUEST_USER:
1469                 dso_type = DSO_TYPE_USER;
1470                 break;
1471         default:
1472                 goto out;
1473         }
1474
1475         dso = machine__findnew_dso(machine, filename);
1476         if (dso != NULL) {
1477                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1478
1479                 dso__set_build_id(dso, &bev->build_id);
1480
1481                 if (!is_kernel_module(filename, cpumode))
1482                         dso->kernel = dso_type;
1483
1484                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1485                                   sbuild_id);
1486                 pr_debug("build id event received for %s: %s\n",
1487                          dso->long_name, sbuild_id);
1488                 dso__put(dso);
1489         }
1490
1491         err = 0;
1492 out:
1493         return err;
1494 }
1495
1496 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1497                                                  int input, u64 offset, u64 size)
1498 {
1499         struct perf_session *session = container_of(header, struct perf_session, header);
1500         struct {
1501                 struct perf_event_header   header;
1502                 u8                         build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1503                 char                       filename[0];
1504         } old_bev;
1505         struct build_id_event bev;
1506         char filename[PATH_MAX];
1507         u64 limit = offset + size;
1508
1509         while (offset < limit) {
1510                 ssize_t len;
1511
1512                 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1513                         return -1;
1514
1515                 if (header->needs_swap)
1516                         perf_event_header__bswap(&old_bev.header);
1517
1518                 len = old_bev.header.size - sizeof(old_bev);
1519                 if (readn(input, filename, len) != len)
1520                         return -1;
1521
1522                 bev.header = old_bev.header;
1523
1524                 /*
1525                  * As the pid is the missing value, we need to fill
1526                  * it properly. The header.misc value give us nice hint.
1527                  */
1528                 bev.pid = HOST_KERNEL_ID;
1529                 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1530                     bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1531                         bev.pid = DEFAULT_GUEST_KERNEL_ID;
1532
1533                 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1534                 __event_process_build_id(&bev, filename, session);
1535
1536                 offset += bev.header.size;
1537         }
1538
1539         return 0;
1540 }
1541
1542 static int perf_header__read_build_ids(struct perf_header *header,
1543                                        int input, u64 offset, u64 size)
1544 {
1545         struct perf_session *session = container_of(header, struct perf_session, header);
1546         struct build_id_event bev;
1547         char filename[PATH_MAX];
1548         u64 limit = offset + size, orig_offset = offset;
1549         int err = -1;
1550
1551         while (offset < limit) {
1552                 ssize_t len;
1553
1554                 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1555                         goto out;
1556
1557                 if (header->needs_swap)
1558                         perf_event_header__bswap(&bev.header);
1559
1560                 len = bev.header.size - sizeof(bev);
1561                 if (readn(input, filename, len) != len)
1562                         goto out;
1563                 /*
1564                  * The a1645ce1 changeset:
1565                  *
1566                  * "perf: 'perf kvm' tool for monitoring guest performance from host"
1567                  *
1568                  * Added a field to struct build_id_event that broke the file
1569                  * format.
1570                  *
1571                  * Since the kernel build-id is the first entry, process the
1572                  * table using the old format if the well known
1573                  * '[kernel.kallsyms]' string for the kernel build-id has the
1574                  * first 4 characters chopped off (where the pid_t sits).
1575                  */
1576                 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1577                         if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1578                                 return -1;
1579                         return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1580                 }
1581
1582                 __event_process_build_id(&bev, filename, session);
1583
1584                 offset += bev.header.size;
1585         }
1586         err = 0;
1587 out:
1588         return err;
1589 }
1590
1591 static int process_tracing_data(struct perf_file_section *section __maybe_unused,
1592                                 struct perf_header *ph __maybe_unused,
1593                                 int fd, void *data)
1594 {
1595         ssize_t ret = trace_report(fd, data, false);
1596         return ret < 0 ? -1 : 0;
1597 }
1598
1599 static int process_build_id(struct perf_file_section *section,
1600                             struct perf_header *ph, int fd,
1601                             void *data __maybe_unused)
1602 {
1603         if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1604                 pr_debug("Failed to read buildids, continuing...\n");
1605         return 0;
1606 }
1607
1608 static int process_hostname(struct perf_file_section *section __maybe_unused,
1609                             struct perf_header *ph, int fd,
1610                             void *data __maybe_unused)
1611 {
1612         ph->env.hostname = do_read_string(fd, ph);
1613         return ph->env.hostname ? 0 : -ENOMEM;
1614 }
1615
1616 static int process_osrelease(struct perf_file_section *section __maybe_unused,
1617                              struct perf_header *ph, int fd,
1618                              void *data __maybe_unused)
1619 {
1620         ph->env.os_release = do_read_string(fd, ph);
1621         return ph->env.os_release ? 0 : -ENOMEM;
1622 }
1623
1624 static int process_version(struct perf_file_section *section __maybe_unused,
1625                            struct perf_header *ph, int fd,
1626                            void *data __maybe_unused)
1627 {
1628         ph->env.version = do_read_string(fd, ph);
1629         return ph->env.version ? 0 : -ENOMEM;
1630 }
1631
1632 static int process_arch(struct perf_file_section *section __maybe_unused,
1633                         struct perf_header *ph, int fd,
1634                         void *data __maybe_unused)
1635 {
1636         ph->env.arch = do_read_string(fd, ph);
1637         return ph->env.arch ? 0 : -ENOMEM;
1638 }
1639
1640 static int process_nrcpus(struct perf_file_section *section __maybe_unused,
1641                           struct perf_header *ph, int fd,
1642                           void *data __maybe_unused)
1643 {
1644         ssize_t ret;
1645         u32 nr;
1646
1647         ret = readn(fd, &nr, sizeof(nr));
1648         if (ret != sizeof(nr))
1649                 return -1;
1650
1651         if (ph->needs_swap)
1652                 nr = bswap_32(nr);
1653
1654         ph->env.nr_cpus_avail = nr;
1655
1656         ret = readn(fd, &nr, sizeof(nr));
1657         if (ret != sizeof(nr))
1658                 return -1;
1659
1660         if (ph->needs_swap)
1661                 nr = bswap_32(nr);
1662
1663         ph->env.nr_cpus_online = nr;
1664         return 0;
1665 }
1666
1667 static int process_cpudesc(struct perf_file_section *section __maybe_unused,
1668                            struct perf_header *ph, int fd,
1669                            void *data __maybe_unused)
1670 {
1671         ph->env.cpu_desc = do_read_string(fd, ph);
1672         return ph->env.cpu_desc ? 0 : -ENOMEM;
1673 }
1674
1675 static int process_cpuid(struct perf_file_section *section __maybe_unused,
1676                          struct perf_header *ph,  int fd,
1677                          void *data __maybe_unused)
1678 {
1679         ph->env.cpuid = do_read_string(fd, ph);
1680         return ph->env.cpuid ? 0 : -ENOMEM;
1681 }
1682
1683 static int process_total_mem(struct perf_file_section *section __maybe_unused,
1684                              struct perf_header *ph, int fd,
1685                              void *data __maybe_unused)
1686 {
1687         uint64_t mem;
1688         ssize_t ret;
1689
1690         ret = readn(fd, &mem, sizeof(mem));
1691         if (ret != sizeof(mem))
1692                 return -1;
1693
1694         if (ph->needs_swap)
1695                 mem = bswap_64(mem);
1696
1697         ph->env.total_mem = mem;
1698         return 0;
1699 }
1700
1701 static struct perf_evsel *
1702 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
1703 {
1704         struct perf_evsel *evsel;
1705
1706         evlist__for_each(evlist, evsel) {
1707                 if (evsel->idx == idx)
1708                         return evsel;
1709         }
1710
1711         return NULL;
1712 }
1713
1714 static void
1715 perf_evlist__set_event_name(struct perf_evlist *evlist,
1716                             struct perf_evsel *event)
1717 {
1718         struct perf_evsel *evsel;
1719
1720         if (!event->name)
1721                 return;
1722
1723         evsel = perf_evlist__find_by_index(evlist, event->idx);
1724         if (!evsel)
1725                 return;
1726
1727         if (evsel->name)
1728                 return;
1729
1730         evsel->name = strdup(event->name);
1731 }
1732
1733 static int
1734 process_event_desc(struct perf_file_section *section __maybe_unused,
1735                    struct perf_header *header, int fd,
1736                    void *data __maybe_unused)
1737 {
1738         struct perf_session *session;
1739         struct perf_evsel *evsel, *events = read_event_desc(header, fd);
1740
1741         if (!events)
1742                 return 0;
1743
1744         session = container_of(header, struct perf_session, header);
1745         for (evsel = events; evsel->attr.size; evsel++)
1746                 perf_evlist__set_event_name(session->evlist, evsel);
1747
1748         free_event_desc(events);
1749
1750         return 0;
1751 }
1752
1753 static int process_cmdline(struct perf_file_section *section,
1754                            struct perf_header *ph, int fd,
1755                            void *data __maybe_unused)
1756 {
1757         ssize_t ret;
1758         char *str, *cmdline = NULL, **argv = NULL;
1759         u32 nr, i, len = 0;
1760
1761         ret = readn(fd, &nr, sizeof(nr));
1762         if (ret != sizeof(nr))
1763                 return -1;
1764
1765         if (ph->needs_swap)
1766                 nr = bswap_32(nr);
1767
1768         ph->env.nr_cmdline = nr;
1769
1770         cmdline = zalloc(section->size + nr + 1);
1771         if (!cmdline)
1772                 return -1;
1773
1774         argv = zalloc(sizeof(char *) * (nr + 1));
1775         if (!argv)
1776                 goto error;
1777
1778         for (i = 0; i < nr; i++) {
1779                 str = do_read_string(fd, ph);
1780                 if (!str)
1781                         goto error;
1782
1783                 argv[i] = cmdline + len;
1784                 memcpy(argv[i], str, strlen(str) + 1);
1785                 len += strlen(str) + 1;
1786                 free(str);
1787         }
1788         ph->env.cmdline = cmdline;
1789         ph->env.cmdline_argv = (const char **) argv;
1790         return 0;
1791
1792 error:
1793         free(argv);
1794         free(cmdline);
1795         return -1;
1796 }
1797
1798 static int process_cpu_topology(struct perf_file_section *section,
1799                                 struct perf_header *ph, int fd,
1800                                 void *data __maybe_unused)
1801 {
1802         ssize_t ret;
1803         u32 nr, i;
1804         char *str;
1805         struct strbuf sb;
1806         int cpu_nr = ph->env.nr_cpus_online;
1807         u64 size = 0;
1808
1809         ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
1810         if (!ph->env.cpu)
1811                 return -1;
1812
1813         ret = readn(fd, &nr, sizeof(nr));
1814         if (ret != sizeof(nr))
1815                 goto free_cpu;
1816
1817         if (ph->needs_swap)
1818                 nr = bswap_32(nr);
1819
1820         ph->env.nr_sibling_cores = nr;
1821         size += sizeof(u32);
1822         strbuf_init(&sb, 128);
1823
1824         for (i = 0; i < nr; i++) {
1825                 str = do_read_string(fd, ph);
1826                 if (!str)
1827                         goto error;
1828
1829                 /* include a NULL character at the end */
1830                 strbuf_add(&sb, str, strlen(str) + 1);
1831                 size += string_size(str);
1832                 free(str);
1833         }
1834         ph->env.sibling_cores = strbuf_detach(&sb, NULL);
1835
1836         ret = readn(fd, &nr, sizeof(nr));
1837         if (ret != sizeof(nr))
1838                 return -1;
1839
1840         if (ph->needs_swap)
1841                 nr = bswap_32(nr);
1842
1843         ph->env.nr_sibling_threads = nr;
1844         size += sizeof(u32);
1845
1846         for (i = 0; i < nr; i++) {
1847                 str = do_read_string(fd, ph);
1848                 if (!str)
1849                         goto error;
1850
1851                 /* include a NULL character at the end */
1852                 strbuf_add(&sb, str, strlen(str) + 1);
1853                 size += string_size(str);
1854                 free(str);
1855         }
1856         ph->env.sibling_threads = strbuf_detach(&sb, NULL);
1857
1858         /*
1859          * The header may be from old perf,
1860          * which doesn't include core id and socket id information.
1861          */
1862         if (section->size <= size) {
1863                 zfree(&ph->env.cpu);
1864                 return 0;
1865         }
1866
1867         for (i = 0; i < (u32)cpu_nr; i++) {
1868                 ret = readn(fd, &nr, sizeof(nr));
1869                 if (ret != sizeof(nr))
1870                         goto free_cpu;
1871
1872                 if (ph->needs_swap)
1873                         nr = bswap_32(nr);
1874
1875                 ph->env.cpu[i].core_id = nr;
1876
1877                 ret = readn(fd, &nr, sizeof(nr));
1878                 if (ret != sizeof(nr))
1879                         goto free_cpu;
1880
1881                 if (ph->needs_swap)
1882                         nr = bswap_32(nr);
1883
1884                 if (nr > (u32)cpu_nr) {
1885                         pr_debug("socket_id number is too big."
1886                                  "You may need to upgrade the perf tool.\n");
1887                         goto free_cpu;
1888                 }
1889
1890                 ph->env.cpu[i].socket_id = nr;
1891         }
1892
1893         return 0;
1894
1895 error:
1896         strbuf_release(&sb);
1897 free_cpu:
1898         zfree(&ph->env.cpu);
1899         return -1;
1900 }
1901
1902 static int process_numa_topology(struct perf_file_section *section __maybe_unused,
1903                                  struct perf_header *ph, int fd,
1904                                  void *data __maybe_unused)
1905 {
1906         ssize_t ret;
1907         u32 nr, node, i;
1908         char *str;
1909         uint64_t mem_total, mem_free;
1910         struct strbuf sb;
1911
1912         /* nr nodes */
1913         ret = readn(fd, &nr, sizeof(nr));
1914         if (ret != sizeof(nr))
1915                 goto error;
1916
1917         if (ph->needs_swap)
1918                 nr = bswap_32(nr);
1919
1920         ph->env.nr_numa_nodes = nr;
1921         strbuf_init(&sb, 256);
1922
1923         for (i = 0; i < nr; i++) {
1924                 /* node number */
1925                 ret = readn(fd, &node, sizeof(node));
1926                 if (ret != sizeof(node))
1927                         goto error;
1928
1929                 ret = readn(fd, &mem_total, sizeof(u64));
1930                 if (ret != sizeof(u64))
1931                         goto error;
1932
1933                 ret = readn(fd, &mem_free, sizeof(u64));
1934                 if (ret != sizeof(u64))
1935                         goto error;
1936
1937                 if (ph->needs_swap) {
1938                         node = bswap_32(node);
1939                         mem_total = bswap_64(mem_total);
1940                         mem_free = bswap_64(mem_free);
1941                 }
1942
1943                 strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
1944                             node, mem_total, mem_free);
1945
1946                 str = do_read_string(fd, ph);
1947                 if (!str)
1948                         goto error;
1949
1950                 /* include a NULL character at the end */
1951                 strbuf_add(&sb, str, strlen(str) + 1);
1952                 free(str);
1953         }
1954         ph->env.numa_nodes = strbuf_detach(&sb, NULL);
1955         return 0;
1956
1957 error:
1958         strbuf_release(&sb);
1959         return -1;
1960 }
1961
1962 static int process_pmu_mappings(struct perf_file_section *section __maybe_unused,
1963                                 struct perf_header *ph, int fd,
1964                                 void *data __maybe_unused)
1965 {
1966         ssize_t ret;
1967         char *name;
1968         u32 pmu_num;
1969         u32 type;
1970         struct strbuf sb;
1971
1972         ret = readn(fd, &pmu_num, sizeof(pmu_num));
1973         if (ret != sizeof(pmu_num))
1974                 return -1;
1975
1976         if (ph->needs_swap)
1977                 pmu_num = bswap_32(pmu_num);
1978
1979         if (!pmu_num) {
1980                 pr_debug("pmu mappings not available\n");
1981                 return 0;
1982         }
1983
1984         ph->env.nr_pmu_mappings = pmu_num;
1985         strbuf_init(&sb, 128);
1986
1987         while (pmu_num) {
1988                 if (readn(fd, &type, sizeof(type)) != sizeof(type))
1989                         goto error;
1990                 if (ph->needs_swap)
1991                         type = bswap_32(type);
1992
1993                 name = do_read_string(fd, ph);
1994                 if (!name)
1995                         goto error;
1996
1997                 strbuf_addf(&sb, "%u:%s", type, name);
1998                 /* include a NULL character at the end */
1999                 strbuf_add(&sb, "", 1);
2000
2001                 if (!strcmp(name, "msr"))
2002                         ph->env.msr_pmu_type = type;
2003
2004                 free(name);
2005                 pmu_num--;
2006         }
2007         ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
2008         return 0;
2009
2010 error:
2011         strbuf_release(&sb);
2012         return -1;
2013 }
2014
2015 static int process_group_desc(struct perf_file_section *section __maybe_unused,
2016                               struct perf_header *ph, int fd,
2017                               void *data __maybe_unused)
2018 {
2019         size_t ret = -1;
2020         u32 i, nr, nr_groups;
2021         struct perf_session *session;
2022         struct perf_evsel *evsel, *leader = NULL;
2023         struct group_desc {
2024                 char *name;
2025                 u32 leader_idx;
2026                 u32 nr_members;
2027         } *desc;
2028
2029         if (readn(fd, &nr_groups, sizeof(nr_groups)) != sizeof(nr_groups))
2030                 return -1;
2031
2032         if (ph->needs_swap)
2033                 nr_groups = bswap_32(nr_groups);
2034
2035         ph->env.nr_groups = nr_groups;
2036         if (!nr_groups) {
2037                 pr_debug("group desc not available\n");
2038                 return 0;
2039         }
2040
2041         desc = calloc(nr_groups, sizeof(*desc));
2042         if (!desc)
2043                 return -1;
2044
2045         for (i = 0; i < nr_groups; i++) {
2046                 desc[i].name = do_read_string(fd, ph);
2047                 if (!desc[i].name)
2048                         goto out_free;
2049
2050                 if (readn(fd, &desc[i].leader_idx, sizeof(u32)) != sizeof(u32))
2051                         goto out_free;
2052
2053                 if (readn(fd, &desc[i].nr_members, sizeof(u32)) != sizeof(u32))
2054                         goto out_free;
2055
2056                 if (ph->needs_swap) {
2057                         desc[i].leader_idx = bswap_32(desc[i].leader_idx);
2058                         desc[i].nr_members = bswap_32(desc[i].nr_members);
2059                 }
2060         }
2061
2062         /*
2063          * Rebuild group relationship based on the group_desc
2064          */
2065         session = container_of(ph, struct perf_session, header);
2066         session->evlist->nr_groups = nr_groups;
2067
2068         i = nr = 0;
2069         evlist__for_each(session->evlist, evsel) {
2070                 if (evsel->idx == (int) desc[i].leader_idx) {
2071                         evsel->leader = evsel;
2072                         /* {anon_group} is a dummy name */
2073                         if (strcmp(desc[i].name, "{anon_group}")) {
2074                                 evsel->group_name = desc[i].name;
2075                                 desc[i].name = NULL;
2076                         }
2077                         evsel->nr_members = desc[i].nr_members;
2078
2079                         if (i >= nr_groups || nr > 0) {
2080                                 pr_debug("invalid group desc\n");
2081                                 goto out_free;
2082                         }
2083
2084                         leader = evsel;
2085                         nr = evsel->nr_members - 1;
2086                         i++;
2087                 } else if (nr) {
2088                         /* This is a group member */
2089                         evsel->leader = leader;
2090
2091                         nr--;
2092                 }
2093         }
2094
2095         if (i != nr_groups || nr != 0) {
2096                 pr_debug("invalid group desc\n");
2097                 goto out_free;
2098         }
2099
2100         ret = 0;
2101 out_free:
2102         for (i = 0; i < nr_groups; i++)
2103                 zfree(&desc[i].name);
2104         free(desc);
2105
2106         return ret;
2107 }
2108
2109 static int process_auxtrace(struct perf_file_section *section,
2110                             struct perf_header *ph, int fd,
2111                             void *data __maybe_unused)
2112 {
2113         struct perf_session *session;
2114         int err;
2115
2116         session = container_of(ph, struct perf_session, header);
2117
2118         err = auxtrace_index__process(fd, section->size, session,
2119                                       ph->needs_swap);
2120         if (err < 0)
2121                 pr_err("Failed to process auxtrace index\n");
2122         return err;
2123 }
2124
2125 static int process_cache(struct perf_file_section *section __maybe_unused,
2126                          struct perf_header *ph __maybe_unused, int fd __maybe_unused,
2127                          void *data __maybe_unused)
2128 {
2129         struct cpu_cache_level *caches;
2130         u32 cnt, i, version;
2131
2132         if (readn(fd, &version, sizeof(version)) != sizeof(version))
2133                 return -1;
2134
2135         if (ph->needs_swap)
2136                 version = bswap_32(version);
2137
2138         if (version != 1)
2139                 return -1;
2140
2141         if (readn(fd, &cnt, sizeof(cnt)) != sizeof(cnt))
2142                 return -1;
2143
2144         if (ph->needs_swap)
2145                 cnt = bswap_32(cnt);
2146
2147         caches = zalloc(sizeof(*caches) * cnt);
2148         if (!caches)
2149                 return -1;
2150
2151         for (i = 0; i < cnt; i++) {
2152                 struct cpu_cache_level c;
2153
2154                 #define _R(v)                                           \
2155                         if (readn(fd, &c.v, sizeof(u32)) != sizeof(u32))\
2156                                 goto out_free_caches;                   \
2157                         if (ph->needs_swap)                             \
2158                                 c.v = bswap_32(c.v);                    \
2159
2160                 _R(level)
2161                 _R(line_size)
2162                 _R(sets)
2163                 _R(ways)
2164                 #undef _R
2165
2166                 #define _R(v)                           \
2167                         c.v = do_read_string(fd, ph);   \
2168                         if (!c.v)                       \
2169                                 goto out_free_caches;
2170
2171                 _R(type)
2172                 _R(size)
2173                 _R(map)
2174                 #undef _R
2175
2176                 caches[i] = c;
2177         }
2178
2179         ph->env.caches = caches;
2180         ph->env.caches_cnt = cnt;
2181         return 0;
2182 out_free_caches:
2183         free(caches);
2184         return -1;
2185 }
2186
2187 struct feature_ops {
2188         int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
2189         void (*print)(struct perf_header *h, int fd, FILE *fp);
2190         int (*process)(struct perf_file_section *section,
2191                        struct perf_header *h, int fd, void *data);
2192         const char *name;
2193         bool full_only;
2194 };
2195
2196 #define FEAT_OPA(n, func) \
2197         [n] = { .name = #n, .write = write_##func, .print = print_##func }
2198 #define FEAT_OPP(n, func) \
2199         [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2200                 .process = process_##func }
2201 #define FEAT_OPF(n, func) \
2202         [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2203                 .process = process_##func, .full_only = true }
2204
2205 /* feature_ops not implemented: */
2206 #define print_tracing_data      NULL
2207 #define print_build_id          NULL
2208
2209 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2210         FEAT_OPP(HEADER_TRACING_DATA,   tracing_data),
2211         FEAT_OPP(HEADER_BUILD_ID,       build_id),
2212         FEAT_OPP(HEADER_HOSTNAME,       hostname),
2213         FEAT_OPP(HEADER_OSRELEASE,      osrelease),
2214         FEAT_OPP(HEADER_VERSION,        version),
2215         FEAT_OPP(HEADER_ARCH,           arch),
2216         FEAT_OPP(HEADER_NRCPUS,         nrcpus),
2217         FEAT_OPP(HEADER_CPUDESC,        cpudesc),
2218         FEAT_OPP(HEADER_CPUID,          cpuid),
2219         FEAT_OPP(HEADER_TOTAL_MEM,      total_mem),
2220         FEAT_OPP(HEADER_EVENT_DESC,     event_desc),
2221         FEAT_OPP(HEADER_CMDLINE,        cmdline),
2222         FEAT_OPF(HEADER_CPU_TOPOLOGY,   cpu_topology),
2223         FEAT_OPF(HEADER_NUMA_TOPOLOGY,  numa_topology),
2224         FEAT_OPA(HEADER_BRANCH_STACK,   branch_stack),
2225         FEAT_OPP(HEADER_PMU_MAPPINGS,   pmu_mappings),
2226         FEAT_OPP(HEADER_GROUP_DESC,     group_desc),
2227         FEAT_OPP(HEADER_AUXTRACE,       auxtrace),
2228         FEAT_OPA(HEADER_STAT,           stat),
2229         FEAT_OPF(HEADER_CACHE,          cache),
2230 };
2231
2232 struct header_print_data {
2233         FILE *fp;
2234         bool full; /* extended list of headers */
2235 };
2236
2237 static int perf_file_section__fprintf_info(struct perf_file_section *section,
2238                                            struct perf_header *ph,
2239                                            int feat, int fd, void *data)
2240 {
2241         struct header_print_data *hd = data;
2242
2243         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2244                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2245                                 "%d, continuing...\n", section->offset, feat);
2246                 return 0;
2247         }
2248         if (feat >= HEADER_LAST_FEATURE) {
2249                 pr_warning("unknown feature %d\n", feat);
2250                 return 0;
2251         }
2252         if (!feat_ops[feat].print)
2253                 return 0;
2254
2255         if (!feat_ops[feat].full_only || hd->full)
2256                 feat_ops[feat].print(ph, fd, hd->fp);
2257         else
2258                 fprintf(hd->fp, "# %s info available, use -I to display\n",
2259                         feat_ops[feat].name);
2260
2261         return 0;
2262 }
2263
2264 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2265 {
2266         struct header_print_data hd;
2267         struct perf_header *header = &session->header;
2268         int fd = perf_data_file__fd(session->file);
2269         hd.fp = fp;
2270         hd.full = full;
2271
2272         perf_header__process_sections(header, fd, &hd,
2273                                       perf_file_section__fprintf_info);
2274         return 0;
2275 }
2276
2277 static int do_write_feat(int fd, struct perf_header *h, int type,
2278                          struct perf_file_section **p,
2279                          struct perf_evlist *evlist)
2280 {
2281         int err;
2282         int ret = 0;
2283
2284         if (perf_header__has_feat(h, type)) {
2285                 if (!feat_ops[type].write)
2286                         return -1;
2287
2288                 (*p)->offset = lseek(fd, 0, SEEK_CUR);
2289
2290                 err = feat_ops[type].write(fd, h, evlist);
2291                 if (err < 0) {
2292                         pr_debug("failed to write feature %d\n", type);
2293
2294                         /* undo anything written */
2295                         lseek(fd, (*p)->offset, SEEK_SET);
2296
2297                         return -1;
2298                 }
2299                 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
2300                 (*p)++;
2301         }
2302         return ret;
2303 }
2304
2305 static int perf_header__adds_write(struct perf_header *header,
2306                                    struct perf_evlist *evlist, int fd)
2307 {
2308         int nr_sections;
2309         struct perf_file_section *feat_sec, *p;
2310         int sec_size;
2311         u64 sec_start;
2312         int feat;
2313         int err;
2314
2315         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2316         if (!nr_sections)
2317                 return 0;
2318
2319         feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2320         if (feat_sec == NULL)
2321                 return -ENOMEM;
2322
2323         sec_size = sizeof(*feat_sec) * nr_sections;
2324
2325         sec_start = header->feat_offset;
2326         lseek(fd, sec_start + sec_size, SEEK_SET);
2327
2328         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2329                 if (do_write_feat(fd, header, feat, &p, evlist))
2330                         perf_header__clear_feat(header, feat);
2331         }
2332
2333         lseek(fd, sec_start, SEEK_SET);
2334         /*
2335          * may write more than needed due to dropped feature, but
2336          * this is okay, reader will skip the mising entries
2337          */
2338         err = do_write(fd, feat_sec, sec_size);
2339         if (err < 0)
2340                 pr_debug("failed to write feature section\n");
2341         free(feat_sec);
2342         return err;
2343 }
2344
2345 int perf_header__write_pipe(int fd)
2346 {
2347         struct perf_pipe_file_header f_header;
2348         int err;
2349
2350         f_header = (struct perf_pipe_file_header){
2351                 .magic     = PERF_MAGIC,
2352                 .size      = sizeof(f_header),
2353         };
2354
2355         err = do_write(fd, &f_header, sizeof(f_header));
2356         if (err < 0) {
2357                 pr_debug("failed to write perf pipe header\n");
2358                 return err;
2359         }
2360
2361         return 0;
2362 }
2363
2364 int perf_session__write_header(struct perf_session *session,
2365                                struct perf_evlist *evlist,
2366                                int fd, bool at_exit)
2367 {
2368         struct perf_file_header f_header;
2369         struct perf_file_attr   f_attr;
2370         struct perf_header *header = &session->header;
2371         struct perf_evsel *evsel;
2372         u64 attr_offset;
2373         int err;
2374
2375         lseek(fd, sizeof(f_header), SEEK_SET);
2376
2377         evlist__for_each(session->evlist, evsel) {
2378                 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2379                 err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
2380                 if (err < 0) {
2381                         pr_debug("failed to write perf header\n");
2382                         return err;
2383                 }
2384         }
2385
2386         attr_offset = lseek(fd, 0, SEEK_CUR);
2387
2388         evlist__for_each(evlist, evsel) {
2389                 f_attr = (struct perf_file_attr){
2390                         .attr = evsel->attr,
2391                         .ids  = {
2392                                 .offset = evsel->id_offset,
2393                                 .size   = evsel->ids * sizeof(u64),
2394                         }
2395                 };
2396                 err = do_write(fd, &f_attr, sizeof(f_attr));
2397                 if (err < 0) {
2398                         pr_debug("failed to write perf header attribute\n");
2399                         return err;
2400                 }
2401         }
2402
2403         if (!header->data_offset)
2404                 header->data_offset = lseek(fd, 0, SEEK_CUR);
2405         header->feat_offset = header->data_offset + header->data_size;
2406
2407         if (at_exit) {
2408                 err = perf_header__adds_write(header, evlist, fd);
2409                 if (err < 0)
2410                         return err;
2411         }
2412
2413         f_header = (struct perf_file_header){
2414                 .magic     = PERF_MAGIC,
2415                 .size      = sizeof(f_header),
2416                 .attr_size = sizeof(f_attr),
2417                 .attrs = {
2418                         .offset = attr_offset,
2419                         .size   = evlist->nr_entries * sizeof(f_attr),
2420                 },
2421                 .data = {
2422                         .offset = header->data_offset,
2423                         .size   = header->data_size,
2424                 },
2425                 /* event_types is ignored, store zeros */
2426         };
2427
2428         memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2429
2430         lseek(fd, 0, SEEK_SET);
2431         err = do_write(fd, &f_header, sizeof(f_header));
2432         if (err < 0) {
2433                 pr_debug("failed to write perf header\n");
2434                 return err;
2435         }
2436         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2437
2438         return 0;
2439 }
2440
2441 static int perf_header__getbuffer64(struct perf_header *header,
2442                                     int fd, void *buf, size_t size)
2443 {
2444         if (readn(fd, buf, size) <= 0)
2445                 return -1;
2446
2447         if (header->needs_swap)
2448                 mem_bswap_64(buf, size);
2449
2450         return 0;
2451 }
2452
2453 int perf_header__process_sections(struct perf_header *header, int fd,
2454                                   void *data,
2455                                   int (*process)(struct perf_file_section *section,
2456                                                  struct perf_header *ph,
2457                                                  int feat, int fd, void *data))
2458 {
2459         struct perf_file_section *feat_sec, *sec;
2460         int nr_sections;
2461         int sec_size;
2462         int feat;
2463         int err;
2464
2465         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2466         if (!nr_sections)
2467                 return 0;
2468
2469         feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2470         if (!feat_sec)
2471                 return -1;
2472
2473         sec_size = sizeof(*feat_sec) * nr_sections;
2474
2475         lseek(fd, header->feat_offset, SEEK_SET);
2476
2477         err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2478         if (err < 0)
2479                 goto out_free;
2480
2481         for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2482                 err = process(sec++, header, feat, fd, data);
2483                 if (err < 0)
2484                         goto out_free;
2485         }
2486         err = 0;
2487 out_free:
2488         free(feat_sec);
2489         return err;
2490 }
2491
2492 static const int attr_file_abi_sizes[] = {
2493         [0] = PERF_ATTR_SIZE_VER0,
2494         [1] = PERF_ATTR_SIZE_VER1,
2495         [2] = PERF_ATTR_SIZE_VER2,
2496         [3] = PERF_ATTR_SIZE_VER3,
2497         [4] = PERF_ATTR_SIZE_VER4,
2498         0,
2499 };
2500
2501 /*
2502  * In the legacy file format, the magic number is not used to encode endianness.
2503  * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2504  * on ABI revisions, we need to try all combinations for all endianness to
2505  * detect the endianness.
2506  */
2507 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2508 {
2509         uint64_t ref_size, attr_size;
2510         int i;
2511
2512         for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2513                 ref_size = attr_file_abi_sizes[i]
2514                          + sizeof(struct perf_file_section);
2515                 if (hdr_sz != ref_size) {
2516                         attr_size = bswap_64(hdr_sz);
2517                         if (attr_size != ref_size)
2518                                 continue;
2519
2520                         ph->needs_swap = true;
2521                 }
2522                 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2523                          i,
2524                          ph->needs_swap);
2525                 return 0;
2526         }
2527         /* could not determine endianness */
2528         return -1;
2529 }
2530
2531 #define PERF_PIPE_HDR_VER0      16
2532
2533 static const size_t attr_pipe_abi_sizes[] = {
2534         [0] = PERF_PIPE_HDR_VER0,
2535         0,
2536 };
2537
2538 /*
2539  * In the legacy pipe format, there is an implicit assumption that endiannesss
2540  * between host recording the samples, and host parsing the samples is the
2541  * same. This is not always the case given that the pipe output may always be
2542  * redirected into a file and analyzed on a different machine with possibly a
2543  * different endianness and perf_event ABI revsions in the perf tool itself.
2544  */
2545 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2546 {
2547         u64 attr_size;
2548         int i;
2549
2550         for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2551                 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2552                         attr_size = bswap_64(hdr_sz);
2553                         if (attr_size != hdr_sz)
2554                                 continue;
2555
2556                         ph->needs_swap = true;
2557                 }
2558                 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2559                 return 0;
2560         }
2561         return -1;
2562 }
2563
2564 bool is_perf_magic(u64 magic)
2565 {
2566         if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2567                 || magic == __perf_magic2
2568                 || magic == __perf_magic2_sw)
2569                 return true;
2570
2571         return false;
2572 }
2573
2574 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2575                               bool is_pipe, struct perf_header *ph)
2576 {
2577         int ret;
2578
2579         /* check for legacy format */
2580         ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2581         if (ret == 0) {
2582                 ph->version = PERF_HEADER_VERSION_1;
2583                 pr_debug("legacy perf.data format\n");
2584                 if (is_pipe)
2585                         return try_all_pipe_abis(hdr_sz, ph);
2586
2587                 return try_all_file_abis(hdr_sz, ph);
2588         }
2589         /*
2590          * the new magic number serves two purposes:
2591          * - unique number to identify actual perf.data files
2592          * - encode endianness of file
2593          */
2594         ph->version = PERF_HEADER_VERSION_2;
2595
2596         /* check magic number with one endianness */
2597         if (magic == __perf_magic2)
2598                 return 0;
2599
2600         /* check magic number with opposite endianness */
2601         if (magic != __perf_magic2_sw)
2602                 return -1;
2603
2604         ph->needs_swap = true;
2605
2606         return 0;
2607 }
2608
2609 int perf_file_header__read(struct perf_file_header *header,
2610                            struct perf_header *ph, int fd)
2611 {
2612         ssize_t ret;
2613
2614         lseek(fd, 0, SEEK_SET);
2615
2616         ret = readn(fd, header, sizeof(*header));
2617         if (ret <= 0)
2618                 return -1;
2619
2620         if (check_magic_endian(header->magic,
2621                                header->attr_size, false, ph) < 0) {
2622                 pr_debug("magic/endian check failed\n");
2623                 return -1;
2624         }
2625
2626         if (ph->needs_swap) {
2627                 mem_bswap_64(header, offsetof(struct perf_file_header,
2628                              adds_features));
2629         }
2630
2631         if (header->size != sizeof(*header)) {
2632                 /* Support the previous format */
2633                 if (header->size == offsetof(typeof(*header), adds_features))
2634                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2635                 else
2636                         return -1;
2637         } else if (ph->needs_swap) {
2638                 /*
2639                  * feature bitmap is declared as an array of unsigned longs --
2640                  * not good since its size can differ between the host that
2641                  * generated the data file and the host analyzing the file.
2642                  *
2643                  * We need to handle endianness, but we don't know the size of
2644                  * the unsigned long where the file was generated. Take a best
2645                  * guess at determining it: try 64-bit swap first (ie., file
2646                  * created on a 64-bit host), and check if the hostname feature
2647                  * bit is set (this feature bit is forced on as of fbe96f2).
2648                  * If the bit is not, undo the 64-bit swap and try a 32-bit
2649                  * swap. If the hostname bit is still not set (e.g., older data
2650                  * file), punt and fallback to the original behavior --
2651                  * clearing all feature bits and setting buildid.
2652                  */
2653                 mem_bswap_64(&header->adds_features,
2654                             BITS_TO_U64(HEADER_FEAT_BITS));
2655
2656                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2657                         /* unswap as u64 */
2658                         mem_bswap_64(&header->adds_features,
2659                                     BITS_TO_U64(HEADER_FEAT_BITS));
2660
2661                         /* unswap as u32 */
2662                         mem_bswap_32(&header->adds_features,
2663                                     BITS_TO_U32(HEADER_FEAT_BITS));
2664                 }
2665
2666                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2667                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2668                         set_bit(HEADER_BUILD_ID, header->adds_features);
2669                 }
2670         }
2671
2672         memcpy(&ph->adds_features, &header->adds_features,
2673                sizeof(ph->adds_features));
2674
2675         ph->data_offset  = header->data.offset;
2676         ph->data_size    = header->data.size;
2677         ph->feat_offset  = header->data.offset + header->data.size;
2678         return 0;
2679 }
2680
2681 static int perf_file_section__process(struct perf_file_section *section,
2682                                       struct perf_header *ph,
2683                                       int feat, int fd, void *data)
2684 {
2685         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2686                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2687                           "%d, continuing...\n", section->offset, feat);
2688                 return 0;
2689         }
2690
2691         if (feat >= HEADER_LAST_FEATURE) {
2692                 pr_debug("unknown feature %d, continuing...\n", feat);
2693                 return 0;
2694         }
2695
2696         if (!feat_ops[feat].process)
2697                 return 0;
2698
2699         return feat_ops[feat].process(section, ph, fd, data);
2700 }
2701
2702 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2703                                        struct perf_header *ph, int fd,
2704                                        bool repipe)
2705 {
2706         ssize_t ret;
2707
2708         ret = readn(fd, header, sizeof(*header));
2709         if (ret <= 0)
2710                 return -1;
2711
2712         if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2713                 pr_debug("endian/magic failed\n");
2714                 return -1;
2715         }
2716
2717         if (ph->needs_swap)
2718                 header->size = bswap_64(header->size);
2719
2720         if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
2721                 return -1;
2722
2723         return 0;
2724 }
2725
2726 static int perf_header__read_pipe(struct perf_session *session)
2727 {
2728         struct perf_header *header = &session->header;
2729         struct perf_pipe_file_header f_header;
2730
2731         if (perf_file_header__read_pipe(&f_header, header,
2732                                         perf_data_file__fd(session->file),
2733                                         session->repipe) < 0) {
2734                 pr_debug("incompatible file format\n");
2735                 return -EINVAL;
2736         }
2737
2738         return 0;
2739 }
2740
2741 static int read_attr(int fd, struct perf_header *ph,
2742                      struct perf_file_attr *f_attr)
2743 {
2744         struct perf_event_attr *attr = &f_attr->attr;
2745         size_t sz, left;
2746         size_t our_sz = sizeof(f_attr->attr);
2747         ssize_t ret;
2748
2749         memset(f_attr, 0, sizeof(*f_attr));
2750
2751         /* read minimal guaranteed structure */
2752         ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2753         if (ret <= 0) {
2754                 pr_debug("cannot read %d bytes of header attr\n",
2755                          PERF_ATTR_SIZE_VER0);
2756                 return -1;
2757         }
2758
2759         /* on file perf_event_attr size */
2760         sz = attr->size;
2761
2762         if (ph->needs_swap)
2763                 sz = bswap_32(sz);
2764
2765         if (sz == 0) {
2766                 /* assume ABI0 */
2767                 sz =  PERF_ATTR_SIZE_VER0;
2768         } else if (sz > our_sz) {
2769                 pr_debug("file uses a more recent and unsupported ABI"
2770                          " (%zu bytes extra)\n", sz - our_sz);
2771                 return -1;
2772         }
2773         /* what we have not yet read and that we know about */
2774         left = sz - PERF_ATTR_SIZE_VER0;
2775         if (left) {
2776                 void *ptr = attr;
2777                 ptr += PERF_ATTR_SIZE_VER0;
2778
2779                 ret = readn(fd, ptr, left);
2780         }
2781         /* read perf_file_section, ids are read in caller */
2782         ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2783
2784         return ret <= 0 ? -1 : 0;
2785 }
2786
2787 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
2788                                                 struct pevent *pevent)
2789 {
2790         struct event_format *event;
2791         char bf[128];
2792
2793         /* already prepared */
2794         if (evsel->tp_format)
2795                 return 0;
2796
2797         if (pevent == NULL) {
2798                 pr_debug("broken or missing trace data\n");
2799                 return -1;
2800         }
2801
2802         event = pevent_find_event(pevent, evsel->attr.config);
2803         if (event == NULL)
2804                 return -1;
2805
2806         if (!evsel->name) {
2807                 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2808                 evsel->name = strdup(bf);
2809                 if (evsel->name == NULL)
2810                         return -1;
2811         }
2812
2813         evsel->tp_format = event;
2814         return 0;
2815 }
2816
2817 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
2818                                                   struct pevent *pevent)
2819 {
2820         struct perf_evsel *pos;
2821
2822         evlist__for_each(evlist, pos) {
2823                 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2824                     perf_evsel__prepare_tracepoint_event(pos, pevent))
2825                         return -1;
2826         }
2827
2828         return 0;
2829 }
2830
2831 int perf_session__read_header(struct perf_session *session)
2832 {
2833         struct perf_data_file *file = session->file;
2834         struct perf_header *header = &session->header;
2835         struct perf_file_header f_header;
2836         struct perf_file_attr   f_attr;
2837         u64                     f_id;
2838         int nr_attrs, nr_ids, i, j;
2839         int fd = perf_data_file__fd(file);
2840
2841         session->evlist = perf_evlist__new();
2842         if (session->evlist == NULL)
2843                 return -ENOMEM;
2844
2845         session->evlist->env = &header->env;
2846         session->machines.host.env = &header->env;
2847         if (perf_data_file__is_pipe(file))
2848                 return perf_header__read_pipe(session);
2849
2850         if (perf_file_header__read(&f_header, header, fd) < 0)
2851                 return -EINVAL;
2852
2853         /*
2854          * Sanity check that perf.data was written cleanly; data size is
2855          * initialized to 0 and updated only if the on_exit function is run.
2856          * If data size is still 0 then the file contains only partial
2857          * information.  Just warn user and process it as much as it can.
2858          */
2859         if (f_header.data.size == 0) {
2860                 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
2861                            "Was the 'perf record' command properly terminated?\n",
2862                            file->path);
2863         }
2864
2865         nr_attrs = f_header.attrs.size / f_header.attr_size;
2866         lseek(fd, f_header.attrs.offset, SEEK_SET);
2867
2868         for (i = 0; i < nr_attrs; i++) {
2869                 struct perf_evsel *evsel;
2870                 off_t tmp;
2871
2872                 if (read_attr(fd, header, &f_attr) < 0)
2873                         goto out_errno;
2874
2875                 if (header->needs_swap) {
2876                         f_attr.ids.size   = bswap_64(f_attr.ids.size);
2877                         f_attr.ids.offset = bswap_64(f_attr.ids.offset);
2878                         perf_event__attr_swap(&f_attr.attr);
2879                 }
2880
2881                 tmp = lseek(fd, 0, SEEK_CUR);
2882                 evsel = perf_evsel__new(&f_attr.attr);
2883
2884                 if (evsel == NULL)
2885                         goto out_delete_evlist;
2886
2887                 evsel->needs_swap = header->needs_swap;
2888                 /*
2889                  * Do it before so that if perf_evsel__alloc_id fails, this
2890                  * entry gets purged too at perf_evlist__delete().
2891                  */
2892                 perf_evlist__add(session->evlist, evsel);
2893
2894                 nr_ids = f_attr.ids.size / sizeof(u64);
2895                 /*
2896                  * We don't have the cpu and thread maps on the header, so
2897                  * for allocating the perf_sample_id table we fake 1 cpu and
2898                  * hattr->ids threads.
2899                  */
2900                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2901                         goto out_delete_evlist;
2902
2903                 lseek(fd, f_attr.ids.offset, SEEK_SET);
2904
2905                 for (j = 0; j < nr_ids; j++) {
2906                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2907                                 goto out_errno;
2908
2909                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2910                 }
2911
2912                 lseek(fd, tmp, SEEK_SET);
2913         }
2914
2915         symbol_conf.nr_events = nr_attrs;
2916
2917         perf_header__process_sections(header, fd, &session->tevent,
2918                                       perf_file_section__process);
2919
2920         if (perf_evlist__prepare_tracepoint_events(session->evlist,
2921                                                    session->tevent.pevent))
2922                 goto out_delete_evlist;
2923
2924         return 0;
2925 out_errno:
2926         return -errno;
2927
2928 out_delete_evlist:
2929         perf_evlist__delete(session->evlist);
2930         session->evlist = NULL;
2931         return -ENOMEM;
2932 }
2933
2934 int perf_event__synthesize_attr(struct perf_tool *tool,
2935                                 struct perf_event_attr *attr, u32 ids, u64 *id,
2936                                 perf_event__handler_t process)
2937 {
2938         union perf_event *ev;
2939         size_t size;
2940         int err;
2941
2942         size = sizeof(struct perf_event_attr);
2943         size = PERF_ALIGN(size, sizeof(u64));
2944         size += sizeof(struct perf_event_header);
2945         size += ids * sizeof(u64);
2946
2947         ev = malloc(size);
2948
2949         if (ev == NULL)
2950                 return -ENOMEM;
2951
2952         ev->attr.attr = *attr;
2953         memcpy(ev->attr.id, id, ids * sizeof(u64));
2954
2955         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2956         ev->attr.header.size = (u16)size;
2957
2958         if (ev->attr.header.size == size)
2959                 err = process(tool, ev, NULL, NULL);
2960         else
2961                 err = -E2BIG;
2962
2963         free(ev);
2964
2965         return err;
2966 }
2967
2968 static struct event_update_event *
2969 event_update_event__new(size_t size, u64 type, u64 id)
2970 {
2971         struct event_update_event *ev;
2972
2973         size += sizeof(*ev);
2974         size  = PERF_ALIGN(size, sizeof(u64));
2975
2976         ev = zalloc(size);
2977         if (ev) {
2978                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
2979                 ev->header.size = (u16)size;
2980                 ev->type = type;
2981                 ev->id = id;
2982         }
2983         return ev;
2984 }
2985
2986 int
2987 perf_event__synthesize_event_update_unit(struct perf_tool *tool,
2988                                          struct perf_evsel *evsel,
2989                                          perf_event__handler_t process)
2990 {
2991         struct event_update_event *ev;
2992         size_t size = strlen(evsel->unit);
2993         int err;
2994
2995         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
2996         if (ev == NULL)
2997                 return -ENOMEM;
2998
2999         strncpy(ev->data, evsel->unit, size);
3000         err = process(tool, (union perf_event *)ev, NULL, NULL);
3001         free(ev);
3002         return err;
3003 }
3004
3005 int
3006 perf_event__synthesize_event_update_scale(struct perf_tool *tool,
3007                                           struct perf_evsel *evsel,
3008                                           perf_event__handler_t process)
3009 {
3010         struct event_update_event *ev;
3011         struct event_update_event_scale *ev_data;
3012         int err;
3013
3014         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->id[0]);
3015         if (ev == NULL)
3016                 return -ENOMEM;
3017
3018         ev_data = (struct event_update_event_scale *) ev->data;
3019         ev_data->scale = evsel->scale;
3020         err = process(tool, (union perf_event*) ev, NULL, NULL);
3021         free(ev);
3022         return err;
3023 }
3024
3025 int
3026 perf_event__synthesize_event_update_name(struct perf_tool *tool,
3027                                          struct perf_evsel *evsel,
3028                                          perf_event__handler_t process)
3029 {
3030         struct event_update_event *ev;
3031         size_t len = strlen(evsel->name);
3032         int err;
3033
3034         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->id[0]);
3035         if (ev == NULL)
3036                 return -ENOMEM;
3037
3038         strncpy(ev->data, evsel->name, len);
3039         err = process(tool, (union perf_event*) ev, NULL, NULL);
3040         free(ev);
3041         return err;
3042 }
3043
3044 int
3045 perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
3046                                         struct perf_evsel *evsel,
3047                                         perf_event__handler_t process)
3048 {
3049         size_t size = sizeof(struct event_update_event);
3050         struct event_update_event *ev;
3051         int max, err;
3052         u16 type;
3053
3054         if (!evsel->own_cpus)
3055                 return 0;
3056
3057         ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
3058         if (!ev)
3059                 return -ENOMEM;
3060
3061         ev->header.type = PERF_RECORD_EVENT_UPDATE;
3062         ev->header.size = (u16)size;
3063         ev->type = PERF_EVENT_UPDATE__CPUS;
3064         ev->id   = evsel->id[0];
3065
3066         cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
3067                                  evsel->own_cpus,
3068                                  type, max);
3069
3070         err = process(tool, (union perf_event*) ev, NULL, NULL);
3071         free(ev);
3072         return err;
3073 }
3074
3075 size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
3076 {
3077         struct event_update_event *ev = &event->event_update;
3078         struct event_update_event_scale *ev_scale;
3079         struct event_update_event_cpus *ev_cpus;
3080         struct cpu_map *map;
3081         size_t ret;
3082
3083         ret = fprintf(fp, "\n... id:    %" PRIu64 "\n", ev->id);
3084
3085         switch (ev->type) {
3086         case PERF_EVENT_UPDATE__SCALE:
3087                 ev_scale = (struct event_update_event_scale *) ev->data;
3088                 ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
3089                 break;
3090         case PERF_EVENT_UPDATE__UNIT:
3091                 ret += fprintf(fp, "... unit:  %s\n", ev->data);
3092                 break;
3093         case PERF_EVENT_UPDATE__NAME:
3094                 ret += fprintf(fp, "... name:  %s\n", ev->data);
3095                 break;
3096         case PERF_EVENT_UPDATE__CPUS:
3097                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3098                 ret += fprintf(fp, "... ");
3099
3100                 map = cpu_map__new_data(&ev_cpus->cpus);
3101                 if (map)
3102                         ret += cpu_map__fprintf(map, fp);
3103                 else
3104                         ret += fprintf(fp, "failed to get cpus\n");
3105                 break;
3106         default:
3107                 ret += fprintf(fp, "... unknown type\n");
3108                 break;
3109         }
3110
3111         return ret;
3112 }
3113
3114 int perf_event__synthesize_attrs(struct perf_tool *tool,
3115                                    struct perf_session *session,
3116                                    perf_event__handler_t process)
3117 {
3118         struct perf_evsel *evsel;
3119         int err = 0;
3120
3121         evlist__for_each(session->evlist, evsel) {
3122                 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
3123                                                   evsel->id, process);
3124                 if (err) {
3125                         pr_debug("failed to create perf header attribute\n");
3126                         return err;
3127                 }
3128         }
3129
3130         return err;
3131 }
3132
3133 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
3134                              union perf_event *event,
3135                              struct perf_evlist **pevlist)
3136 {
3137         u32 i, ids, n_ids;
3138         struct perf_evsel *evsel;
3139         struct perf_evlist *evlist = *pevlist;
3140
3141         if (evlist == NULL) {
3142                 *pevlist = evlist = perf_evlist__new();
3143                 if (evlist == NULL)
3144                         return -ENOMEM;
3145         }
3146
3147         evsel = perf_evsel__new(&event->attr.attr);
3148         if (evsel == NULL)
3149                 return -ENOMEM;
3150
3151         perf_evlist__add(evlist, evsel);
3152
3153         ids = event->header.size;
3154         ids -= (void *)&event->attr.id - (void *)event;
3155         n_ids = ids / sizeof(u64);
3156         /*
3157          * We don't have the cpu and thread maps on the header, so
3158          * for allocating the perf_sample_id table we fake 1 cpu and
3159          * hattr->ids threads.
3160          */
3161         if (perf_evsel__alloc_id(evsel, 1, n_ids))
3162                 return -ENOMEM;
3163
3164         for (i = 0; i < n_ids; i++) {
3165                 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3166         }
3167
3168         symbol_conf.nr_events = evlist->nr_entries;
3169
3170         return 0;
3171 }
3172
3173 int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
3174                                      union perf_event *event,
3175                                      struct perf_evlist **pevlist)
3176 {
3177         struct event_update_event *ev = &event->event_update;
3178         struct event_update_event_scale *ev_scale;
3179         struct event_update_event_cpus *ev_cpus;
3180         struct perf_evlist *evlist;
3181         struct perf_evsel *evsel;
3182         struct cpu_map *map;
3183
3184         if (!pevlist || *pevlist == NULL)
3185                 return -EINVAL;
3186
3187         evlist = *pevlist;
3188
3189         evsel = perf_evlist__id2evsel(evlist, ev->id);
3190         if (evsel == NULL)
3191                 return -EINVAL;
3192
3193         switch (ev->type) {
3194         case PERF_EVENT_UPDATE__UNIT:
3195                 evsel->unit = strdup(ev->data);
3196                 break;
3197         case PERF_EVENT_UPDATE__NAME:
3198                 evsel->name = strdup(ev->data);
3199                 break;
3200         case PERF_EVENT_UPDATE__SCALE:
3201                 ev_scale = (struct event_update_event_scale *) ev->data;
3202                 evsel->scale = ev_scale->scale;
3203         case PERF_EVENT_UPDATE__CPUS:
3204                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3205
3206                 map = cpu_map__new_data(&ev_cpus->cpus);
3207                 if (map)
3208                         evsel->own_cpus = map;
3209                 else
3210                         pr_err("failed to get event_update cpus\n");
3211         default:
3212                 break;
3213         }
3214
3215         return 0;
3216 }
3217
3218 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3219                                         struct perf_evlist *evlist,
3220                                         perf_event__handler_t process)
3221 {
3222         union perf_event ev;
3223         struct tracing_data *tdata;
3224         ssize_t size = 0, aligned_size = 0, padding;
3225         int err __maybe_unused = 0;
3226
3227         /*
3228          * We are going to store the size of the data followed
3229          * by the data contents. Since the fd descriptor is a pipe,
3230          * we cannot seek back to store the size of the data once
3231          * we know it. Instead we:
3232          *
3233          * - write the tracing data to the temp file
3234          * - get/write the data size to pipe
3235          * - write the tracing data from the temp file
3236          *   to the pipe
3237          */
3238         tdata = tracing_data_get(&evlist->entries, fd, true);
3239         if (!tdata)
3240                 return -1;
3241
3242         memset(&ev, 0, sizeof(ev));
3243
3244         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3245         size = tdata->size;
3246         aligned_size = PERF_ALIGN(size, sizeof(u64));
3247         padding = aligned_size - size;
3248         ev.tracing_data.header.size = sizeof(ev.tracing_data);
3249         ev.tracing_data.size = aligned_size;
3250
3251         process(tool, &ev, NULL, NULL);
3252
3253         /*
3254          * The put function will copy all the tracing data
3255          * stored in temp file to the pipe.
3256          */
3257         tracing_data_put(tdata);
3258
3259         write_padded(fd, NULL, 0, padding);
3260
3261         return aligned_size;
3262 }
3263
3264 int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
3265                                      union perf_event *event,
3266                                      struct perf_session *session)
3267 {
3268         ssize_t size_read, padding, size = event->tracing_data.size;
3269         int fd = perf_data_file__fd(session->file);
3270         off_t offset = lseek(fd, 0, SEEK_CUR);
3271         char buf[BUFSIZ];
3272
3273         /* setup for reading amidst mmap */
3274         lseek(fd, offset + sizeof(struct tracing_data_event),
3275               SEEK_SET);
3276
3277         size_read = trace_report(fd, &session->tevent,
3278                                  session->repipe);
3279         padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3280
3281         if (readn(fd, buf, padding) < 0) {
3282                 pr_err("%s: reading input file", __func__);
3283                 return -1;
3284         }
3285         if (session->repipe) {
3286                 int retw = write(STDOUT_FILENO, buf, padding);
3287                 if (retw <= 0 || retw != padding) {
3288                         pr_err("%s: repiping tracing data padding", __func__);
3289                         return -1;
3290                 }
3291         }
3292
3293         if (size_read + padding != size) {
3294                 pr_err("%s: tracing data size mismatch", __func__);
3295                 return -1;
3296         }
3297
3298         perf_evlist__prepare_tracepoint_events(session->evlist,
3299                                                session->tevent.pevent);
3300
3301         return size_read + padding;
3302 }
3303
3304 int perf_event__synthesize_build_id(struct perf_tool *tool,
3305                                     struct dso *pos, u16 misc,
3306                                     perf_event__handler_t process,
3307                                     struct machine *machine)
3308 {
3309         union perf_event ev;
3310         size_t len;
3311         int err = 0;
3312
3313         if (!pos->hit)
3314                 return err;
3315
3316         memset(&ev, 0, sizeof(ev));
3317
3318         len = pos->long_name_len + 1;
3319         len = PERF_ALIGN(len, NAME_ALIGN);
3320         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3321         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3322         ev.build_id.header.misc = misc;
3323         ev.build_id.pid = machine->pid;
3324         ev.build_id.header.size = sizeof(ev.build_id) + len;
3325         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3326
3327         err = process(tool, &ev, NULL, machine);
3328
3329         return err;
3330 }
3331
3332 int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
3333                                  union perf_event *event,
3334                                  struct perf_session *session)
3335 {
3336         __event_process_build_id(&event->build_id,
3337                                  event->build_id.filename,
3338                                  session);
3339         return 0;
3340 }