tools/perf/util/header.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <inttypes.h>
   4 #include "util.h"
   5 #include "string2.h"
   6 #include <sys/param.h>
   7 #include <sys/types.h>
   8 #include <byteswap.h>
   9 #include <unistd.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <linux/compiler.h>
  13 #include <linux/list.h>
  14 #include <linux/kernel.h>
  15 #include <linux/bitops.h>
  16 #include <linux/stringify.h>
  17 #include <sys/stat.h>
  18 #include <sys/utsname.h>
  19 #include <linux/time64.h>
  20 #include <dirent.h>
  21
  22 #include "evlist.h"
  23 #include "evsel.h"
  24 #include "header.h"
  25 #include "memswap.h"
  26 #include "../perf.h"
  27 #include "trace-event.h"
  28 #include "session.h"
  29 #include "symbol.h"
  30 #include "debug.h"
  31 #include "cpumap.h"
  32 #include "pmu.h"
  33 #include "vdso.h"
  34 #include "strbuf.h"
  35 #include "build-id.h"
  36 #include "data.h"
  37 #include <api/fs/fs.h>
  38 #include "asm/bug.h"
  39 #include "tool.h"
  40 #include "time-utils.h"
  41 #include "units.h"
  42
  43 #include "sane_ctype.h"
  44
  45 /*
  46  * magic2 = "PERFILE2"
  47  * must be a numerical value to let the endianness
  48  * determine the memory layout. That way we are able
  49  * to detect endianness when reading the perf.data file
  50  * back.
  51  *
  52  * we check for legacy (PERFFILE) format.
  53  */
  54 static const char *__perf_magic1 = "PERFFILE";
  55 static const u64 __perf_magic2    = 0x32454c4946524550ULL;
  56 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
  57
  58 #define PERF_MAGIC      __perf_magic2
  59
  60 const char perf_version_string[] = PERF_VERSION;
  61
  62 struct perf_file_attr {
  63         struct perf_event_attr  attr;
  64         struct perf_file_section        ids;
  65 };
  66
  67 struct feat_fd {
  68         struct perf_header      *ph;
  69         int                     fd;
  70         void                    *buf;   /* Either buf != NULL or fd >= 0 */
  71         ssize_t                 offset;
  72         size_t                  size;
  73         struct perf_evsel       *events;
  74 };
  75
  76 void perf_header__set_feat(struct perf_header *header, int feat)
  77 {
  78         set_bit(feat, header->adds_features);
  79 }
  80
  81 void perf_header__clear_feat(struct perf_header *header, int feat)
  82 {
  83         clear_bit(feat, header->adds_features);
  84 }
  85
  86 bool perf_header__has_feat(const struct perf_header *header, int feat)
  87 {
  88         return test_bit(feat, header->adds_features);
  89 }
  90
  91 static int __do_write_fd(struct feat_fd *ff, const void *buf, size_t size)
  92 {
  93         ssize_t ret = writen(ff->fd, buf, size);
  94
  95         if (ret != (ssize_t)size)
  96                 return ret < 0 ? (int)ret : -1;
  97         return 0;
  98 }
  99
 100 static int __do_write_buf(struct feat_fd *ff,  const void *buf, size_t size)
 101 {
 102         /* struct perf_event_header::size is u16 */
 103         const size_t max_size = 0xffff - sizeof(struct perf_event_header);
 104         size_t new_size = ff->size;
 105         void *addr;
 106
 107         if (size + ff->offset > max_size)
 108                 return -E2BIG;
 109
 110         while (size > (new_size - ff->offset))
 111                 new_size <<= 1;
 112         new_size = min(max_size, new_size);
 113
 114         if (ff->size < new_size) {
 115                 addr = realloc(ff->buf, new_size);
 116                 if (!addr)
 117                         return -ENOMEM;
 118                 ff->buf = addr;
 119                 ff->size = new_size;
 120         }
 121
 122         memcpy(ff->buf + ff->offset, buf, size);
 123         ff->offset += size;
 124
 125         return 0;
 126 }
 127
 128 /* Return: 0 if succeded, -ERR if failed. */
 129 int do_write(struct feat_fd *ff, const void *buf, size_t size)
 130 {
 131         if (!ff->buf)
 132                 return __do_write_fd(ff, buf, size);
 133         return __do_write_buf(ff, buf, size);
 134 }
 135
 136 /* Return: 0 if succeded, -ERR if failed. */
 137 static int do_write_bitmap(struct feat_fd *ff, unsigned long *set, u64 size)
 138 {
 139         u64 *p = (u64 *) set;
 140         int i, ret;
 141
 142         ret = do_write(ff, &size, sizeof(size));
 143         if (ret < 0)
 144                 return ret;
 145
 146         for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
 147                 ret = do_write(ff, p + i, sizeof(*p));
 148                 if (ret < 0)
 149                         return ret;
 150         }
 151
 152         return 0;
 153 }
 154
 155 /* Return: 0 if succeded, -ERR if failed. */
 156 int write_padded(struct feat_fd *ff, const void *bf,
 157                  size_t count, size_t count_aligned)
 158 {
 159         static const char zero_buf[NAME_ALIGN];
 160         int err = do_write(ff, bf, count);
 161
 162         if (!err)
 163                 err = do_write(ff, zero_buf, count_aligned - count);
 164
 165         return err;
 166 }
 167
 168 #define string_size(str)                                                \
 169         (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
 170
 171 /* Return: 0 if succeded, -ERR if failed. */
 172 static int do_write_string(struct feat_fd *ff, const char *str)
 173 {
 174         u32 len, olen;
 175         int ret;
 176
 177         olen = strlen(str) + 1;
 178         len = PERF_ALIGN(olen, NAME_ALIGN);
 179
 180         /* write len, incl. \0 */
 181         ret = do_write(ff, &len, sizeof(len));
 182         if (ret < 0)
 183                 return ret;
 184
 185         return write_padded(ff, str, olen, len);
 186 }
 187
 188 static int __do_read_fd(struct feat_fd *ff, void *addr, ssize_t size)
 189 {
 190         ssize_t ret = readn(ff->fd, addr, size);
 191
 192         if (ret != size)
 193                 return ret < 0 ? (int)ret : -1;
 194         return 0;
 195 }
 196
 197 static int __do_read_buf(struct feat_fd *ff, void *addr, ssize_t size)
 198 {
 199         if (size > (ssize_t)ff->size - ff->offset)
 200                 return -1;
 201
 202         memcpy(addr, ff->buf + ff->offset, size);
 203         ff->offset += size;
 204
 205         return 0;
 206
 207 }
 208
 209 static int __do_read(struct feat_fd *ff, void *addr, ssize_t size)
 210 {
 211         if (!ff->buf)
 212                 return __do_read_fd(ff, addr, size);
 213         return __do_read_buf(ff, addr, size);
 214 }
 215
 216 static int do_read_u32(struct feat_fd *ff, u32 *addr)
 217 {
 218         int ret;
 219
 220         ret = __do_read(ff, addr, sizeof(*addr));
 221         if (ret)
 222                 return ret;
 223
 224         if (ff->ph->needs_swap)
 225                 *addr = bswap_32(*addr);
 226         return 0;
 227 }
 228
 229 static int do_read_u64(struct feat_fd *ff, u64 *addr)
 230 {
 231         int ret;
 232
 233         ret = __do_read(ff, addr, sizeof(*addr));
 234         if (ret)
 235                 return ret;
 236
 237         if (ff->ph->needs_swap)
 238                 *addr = bswap_64(*addr);
 239         return 0;
 240 }
 241
 242 static char *do_read_string(struct feat_fd *ff)
 243 {
 244         u32 len;
 245         char *buf;
 246
 247         if (do_read_u32(ff, &len))
 248                 return NULL;
 249
 250         buf = malloc(len);
 251         if (!buf)
 252                 return NULL;
 253
 254         if (!__do_read(ff, buf, len)) {
 255                 /*
 256                  * strings are padded by zeroes
 257                  * thus the actual strlen of buf
 258                  * may be less than len
 259                  */
 260                 return buf;
 261         }
 262
 263         free(buf);
 264         return NULL;
 265 }
 266
 267 /* Return: 0 if succeded, -ERR if failed. */
 268 static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
 269 {
 270         unsigned long *set;
 271         u64 size, *p;
 272         int i, ret;
 273
 274         ret = do_read_u64(ff, &size);
 275         if (ret)
 276                 return ret;
 277
 278         set = bitmap_alloc(size);
 279         if (!set)
 280                 return -ENOMEM;
 281
 282         p = (u64 *) set;
 283
 284         for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
 285                 ret = do_read_u64(ff, p + i);
 286                 if (ret < 0) {
 287                         free(set);
 288                         return ret;
 289                 }
 290         }
 291
 292         *pset  = set;
 293         *psize = size;
 294         return 0;
 295 }
 296
 297 static int write_tracing_data(struct feat_fd *ff,
 298                               struct perf_evlist *evlist)
 299 {
 300         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
 301                 return -1;
 302
 303         return read_tracing_data(ff->fd, &evlist->entries);
 304 }
 305
 306 static int write_build_id(struct feat_fd *ff,
 307                           struct perf_evlist *evlist __maybe_unused)
 308 {
 309         struct perf_session *session;
 310         int err;
 311
 312         session = container_of(ff->ph, struct perf_session, header);
 313
 314         if (!perf_session__read_build_ids(session, true))
 315                 return -1;
 316
 317         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
 318                 return -1;
 319
 320         err = perf_session__write_buildid_table(session, ff);
 321         if (err < 0) {
 322                 pr_debug("failed to write buildid table\n");
 323                 return err;
 324         }
 325         perf_session__cache_build_ids(session);
 326
 327         return 0;
 328 }
 329
 330 static int write_hostname(struct feat_fd *ff,
 331                           struct perf_evlist *evlist __maybe_unused)
 332 {
 333         struct utsname uts;
 334         int ret;
 335
 336         ret = uname(&uts);
 337         if (ret < 0)
 338                 return -1;
 339
 340         return do_write_string(ff, uts.nodename);
 341 }
 342
 343 static int write_osrelease(struct feat_fd *ff,
 344                            struct perf_evlist *evlist __maybe_unused)
 345 {
 346         struct utsname uts;
 347         int ret;
 348
 349         ret = uname(&uts);
 350         if (ret < 0)
 351                 return -1;
 352
 353         return do_write_string(ff, uts.release);
 354 }
 355
 356 static int write_arch(struct feat_fd *ff,
 357                       struct perf_evlist *evlist __maybe_unused)
 358 {
 359         struct utsname uts;
 360         int ret;
 361
 362         ret = uname(&uts);
 363         if (ret < 0)
 364                 return -1;
 365
 366         return do_write_string(ff, uts.machine);
 367 }
 368
 369 static int write_version(struct feat_fd *ff,
 370                          struct perf_evlist *evlist __maybe_unused)
 371 {
 372         return do_write_string(ff, perf_version_string);
 373 }
 374
 375 static int __write_cpudesc(struct feat_fd *ff, const char *cpuinfo_proc)
 376 {
 377         FILE *file;
 378         char *buf = NULL;
 379         char *s, *p;
 380         const char *search = cpuinfo_proc;
 381         size_t len = 0;
 382         int ret = -1;
 383
 384         if (!search)
 385                 return -1;
 386
 387         file = fopen("/proc/cpuinfo", "r");
 388         if (!file)
 389                 return -1;
 390
 391         while (getline(&buf, &len, file) > 0) {
 392                 ret = strncmp(buf, search, strlen(search));
 393                 if (!ret)
 394                         break;
 395         }
 396
 397         if (ret) {
 398                 ret = -1;
 399                 goto done;
 400         }
 401
 402         s = buf;
 403
 404         p = strchr(buf, ':');
 405         if (p && *(p+1) == ' ' && *(p+2))
 406                 s = p + 2;
 407         p = strchr(s, '\n');
 408         if (p)
 409                 *p = '\0';
 410
 411         /* squash extra space characters (branding string) */
 412         p = s;
 413         while (*p) {
 414                 if (isspace(*p)) {
 415                         char *r = p + 1;
 416                         char *q = r;
 417                         *p = ' ';
 418                         while (*q && isspace(*q))
 419                                 q++;
 420                         if (q != (p+1))
 421                                 while ((*r++ = *q++));
 422                 }
 423                 p++;
 424         }
 425         ret = do_write_string(ff, s);
 426 done:
 427         free(buf);
 428         fclose(file);
 429         return ret;
 430 }
 431
 432 static int write_cpudesc(struct feat_fd *ff,
 433                        struct perf_evlist *evlist __maybe_unused)
 434 {
 435         const char *cpuinfo_procs[] = CPUINFO_PROC;
 436         unsigned int i;
 437
 438         for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
 439                 int ret;
 440                 ret = __write_cpudesc(ff, cpuinfo_procs[i]);
 441                 if (ret >= 0)
 442                         return ret;
 443         }
 444         return -1;
 445 }
 446
 447
 448 static int write_nrcpus(struct feat_fd *ff,
 449                         struct perf_evlist *evlist __maybe_unused)
 450 {
 451         long nr;
 452         u32 nrc, nra;
 453         int ret;
 454
 455         nrc = cpu__max_present_cpu();
 456
 457         nr = sysconf(_SC_NPROCESSORS_ONLN);
 458         if (nr < 0)
 459                 return -1;
 460
 461         nra = (u32)(nr & UINT_MAX);
 462
 463         ret = do_write(ff, &nrc, sizeof(nrc));
 464         if (ret < 0)
 465                 return ret;
 466
 467         return do_write(ff, &nra, sizeof(nra));
 468 }
 469
 470 static int write_event_desc(struct feat_fd *ff,
 471                             struct perf_evlist *evlist)
 472 {
 473         struct perf_evsel *evsel;
 474         u32 nre, nri, sz;
 475         int ret;
 476
 477         nre = evlist->nr_entries;
 478
 479         /*
 480          * write number of events
 481          */
 482         ret = do_write(ff, &nre, sizeof(nre));
 483         if (ret < 0)
 484                 return ret;
 485
 486         /*
 487          * size of perf_event_attr struct
 488          */
 489         sz = (u32)sizeof(evsel->attr);
 490         ret = do_write(ff, &sz, sizeof(sz));
 491         if (ret < 0)
 492                 return ret;
 493
 494         evlist__for_each_entry(evlist, evsel) {
 495                 ret = do_write(ff, &evsel->attr, sz);
 496                 if (ret < 0)
 497                         return ret;
 498                 /*
 499                  * write number of unique id per event
 500                  * there is one id per instance of an event
 501                  *
 502                  * copy into an nri to be independent of the
 503                  * type of ids,
 504                  */
 505                 nri = evsel->ids;
 506                 ret = do_write(ff, &nri, sizeof(nri));
 507                 if (ret < 0)
 508                         return ret;
 509
 510                 /*
 511                  * write event string as passed on cmdline
 512                  */
 513                 ret = do_write_string(ff, perf_evsel__name(evsel));
 514                 if (ret < 0)
 515                         return ret;
 516                 /*
 517                  * write unique ids for this event
 518                  */
 519                 ret = do_write(ff, evsel->id, evsel->ids * sizeof(u64));
 520                 if (ret < 0)
 521                         return ret;
 522         }
 523         return 0;
 524 }
 525
 526 static int write_cmdline(struct feat_fd *ff,
 527                          struct perf_evlist *evlist __maybe_unused)
 528 {
 529         char buf[MAXPATHLEN];
 530         u32 n;
 531         int i, ret;
 532
 533         /* actual path to perf binary */
 534         ret = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
 535         if (ret <= 0)
 536                 return -1;
 537
 538         /* readlink() does not add null termination */
 539         buf[ret] = '\0';
 540
 541         /* account for binary path */
 542         n = perf_env.nr_cmdline + 1;
 543
 544         ret = do_write(ff, &n, sizeof(n));
 545         if (ret < 0)
 546                 return ret;
 547
 548         ret = do_write_string(ff, buf);
 549         if (ret < 0)
 550                 return ret;
 551
 552         for (i = 0 ; i < perf_env.nr_cmdline; i++) {
 553                 ret = do_write_string(ff, perf_env.cmdline_argv[i]);
 554                 if (ret < 0)
 555                         return ret;
 556         }
 557         return 0;
 558 }
 559
 560 #define CORE_SIB_FMT \
 561         "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
 562 #define THRD_SIB_FMT \
 563         "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
 564
 565 struct cpu_topo {
 566         u32 cpu_nr;
 567         u32 core_sib;
 568         u32 thread_sib;
 569         char **core_siblings;
 570         char **thread_siblings;
 571 };
 572
 573 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
 574 {
 575         FILE *fp;
 576         char filename[MAXPATHLEN];
 577         char *buf = NULL, *p;
 578         size_t len = 0;
 579         ssize_t sret;
 580         u32 i = 0;
 581         int ret = -1;
 582
 583         sprintf(filename, CORE_SIB_FMT, cpu);
 584         fp = fopen(filename, "r");
 585         if (!fp)
 586                 goto try_threads;
 587
 588         sret = getline(&buf, &len, fp);
 589         fclose(fp);
 590         if (sret <= 0)
 591                 goto try_threads;
 592
 593         p = strchr(buf, '\n');
 594         if (p)
 595                 *p = '\0';
 596
 597         for (i = 0; i < tp->core_sib; i++) {
 598                 if (!strcmp(buf, tp->core_siblings[i]))
 599                         break;
 600         }
 601         if (i == tp->core_sib) {
 602                 tp->core_siblings[i] = buf;
 603                 tp->core_sib++;
 604                 buf = NULL;
 605                 len = 0;
 606         }
 607         ret = 0;
 608
 609 try_threads:
 610         sprintf(filename, THRD_SIB_FMT, cpu);
 611         fp = fopen(filename, "r");
 612         if (!fp)
 613                 goto done;
 614
 615         if (getline(&buf, &len, fp) <= 0)
 616                 goto done;
 617
 618         p = strchr(buf, '\n');
 619         if (p)
 620                 *p = '\0';
 621
 622         for (i = 0; i < tp->thread_sib; i++) {
 623                 if (!strcmp(buf, tp->thread_siblings[i]))
 624                         break;
 625         }
 626         if (i == tp->thread_sib) {
 627                 tp->thread_siblings[i] = buf;
 628                 tp->thread_sib++;
 629                 buf = NULL;
 630         }
 631         ret = 0;
 632 done:
 633         if(fp)
 634                 fclose(fp);
 635         free(buf);
 636         return ret;
 637 }
 638
 639 static void free_cpu_topo(struct cpu_topo *tp)
 640 {
 641         u32 i;
 642
 643         if (!tp)
 644                 return;
 645
 646         for (i = 0 ; i < tp->core_sib; i++)
 647                 zfree(&tp->core_siblings[i]);
 648
 649         for (i = 0 ; i < tp->thread_sib; i++)
 650                 zfree(&tp->thread_siblings[i]);
 651
 652         free(tp);
 653 }
 654
 655 static struct cpu_topo *build_cpu_topology(void)
 656 {
 657         struct cpu_topo *tp = NULL;
 658         void *addr;
 659         u32 nr, i;
 660         size_t sz;
 661         long ncpus;
 662         int ret = -1;
 663         struct cpu_map *map;
 664
 665         ncpus = cpu__max_present_cpu();
 666
 667         /* build online CPU map */
 668         map = cpu_map__new(NULL);
 669         if (map == NULL) {
 670                 pr_debug("failed to get system cpumap\n");
 671                 return NULL;
 672         }
 673
 674         nr = (u32)(ncpus & UINT_MAX);
 675
 676         sz = nr * sizeof(char *);
 677         addr = calloc(1, sizeof(*tp) + 2 * sz);
 678         if (!addr)
 679                 goto out_free;
 680
 681         tp = addr;
 682         tp->cpu_nr = nr;
 683         addr += sizeof(*tp);
 684         tp->core_siblings = addr;
 685         addr += sz;
 686         tp->thread_siblings = addr;
 687
 688         for (i = 0; i < nr; i++) {
 689                 if (!cpu_map__has(map, i))
 690                         continue;
 691
 692                 ret = build_cpu_topo(tp, i);
 693                 if (ret < 0)
 694                         break;
 695         }
 696
 697 out_free:
 698         cpu_map__put(map);
 699         if (ret) {
 700                 free_cpu_topo(tp);
 701                 tp = NULL;
 702         }
 703         return tp;
 704 }
 705
 706 static int write_cpu_topology(struct feat_fd *ff,
 707                               struct perf_evlist *evlist __maybe_unused)
 708 {
 709         struct cpu_topo *tp;
 710         u32 i;
 711         int ret, j;
 712
 713         tp = build_cpu_topology();
 714         if (!tp)
 715                 return -1;
 716
 717         ret = do_write(ff, &tp->core_sib, sizeof(tp->core_sib));
 718         if (ret < 0)
 719                 goto done;
 720
 721         for (i = 0; i < tp->core_sib; i++) {
 722                 ret = do_write_string(ff, tp->core_siblings[i]);
 723                 if (ret < 0)
 724                         goto done;
 725         }
 726         ret = do_write(ff, &tp->thread_sib, sizeof(tp->thread_sib));
 727         if (ret < 0)
 728                 goto done;
 729
 730         for (i = 0; i < tp->thread_sib; i++) {
 731                 ret = do_write_string(ff, tp->thread_siblings[i]);
 732                 if (ret < 0)
 733                         break;
 734         }
 735
 736         ret = perf_env__read_cpu_topology_map(&perf_env);
 737         if (ret < 0)
 738                 goto done;
 739
 740         for (j = 0; j < perf_env.nr_cpus_avail; j++) {
 741                 ret = do_write(ff, &perf_env.cpu[j].core_id,
 742                                sizeof(perf_env.cpu[j].core_id));
 743                 if (ret < 0)
 744                         return ret;
 745                 ret = do_write(ff, &perf_env.cpu[j].socket_id,
 746                                sizeof(perf_env.cpu[j].socket_id));
 747                 if (ret < 0)
 748                         return ret;
 749         }
 750 done:
 751         free_cpu_topo(tp);
 752         return ret;
 753 }
 754
 755
 756
 757 static int write_total_mem(struct feat_fd *ff,
 758                            struct perf_evlist *evlist __maybe_unused)
 759 {
 760         char *buf = NULL;
 761         FILE *fp;
 762         size_t len = 0;
 763         int ret = -1, n;
 764         uint64_t mem;
 765
 766         fp = fopen("/proc/meminfo", "r");
 767         if (!fp)
 768                 return -1;
 769
 770         while (getline(&buf, &len, fp) > 0) {
 771                 ret = strncmp(buf, "MemTotal:", 9);
 772                 if (!ret)
 773                         break;
 774         }
 775         if (!ret) {
 776                 n = sscanf(buf, "%*s %"PRIu64, &mem);
 777                 if (n == 1)
 778                         ret = do_write(ff, &mem, sizeof(mem));
 779         } else
 780                 ret = -1;
 781         free(buf);
 782         fclose(fp);
 783         return ret;
 784 }
 785
 786 static int write_topo_node(struct feat_fd *ff, int node)
 787 {
 788         char str[MAXPATHLEN];
 789         char field[32];
 790         char *buf = NULL, *p;
 791         size_t len = 0;
 792         FILE *fp;
 793         u64 mem_total, mem_free, mem;
 794         int ret = -1;
 795
 796         sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
 797         fp = fopen(str, "r");
 798         if (!fp)
 799                 return -1;
 800
 801         while (getline(&buf, &len, fp) > 0) {
 802                 /* skip over invalid lines */
 803                 if (!strchr(buf, ':'))
 804                         continue;
 805                 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
 806                         goto done;
 807                 if (!strcmp(field, "MemTotal:"))
 808                         mem_total = mem;
 809                 if (!strcmp(field, "MemFree:"))
 810                         mem_free = mem;
 811         }
 812
 813         fclose(fp);
 814         fp = NULL;
 815
 816         ret = do_write(ff, &mem_total, sizeof(u64));
 817         if (ret)
 818                 goto done;
 819
 820         ret = do_write(ff, &mem_free, sizeof(u64));
 821         if (ret)
 822                 goto done;
 823
 824         ret = -1;
 825         sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
 826
 827         fp = fopen(str, "r");
 828         if (!fp)
 829                 goto done;
 830
 831         if (getline(&buf, &len, fp) <= 0)
 832                 goto done;
 833
 834         p = strchr(buf, '\n');
 835         if (p)
 836                 *p = '\0';
 837
 838         ret = do_write_string(ff, buf);
 839 done:
 840         free(buf);
 841         if (fp)
 842                 fclose(fp);
 843         return ret;
 844 }
 845
 846 static int write_numa_topology(struct feat_fd *ff,
 847                                struct perf_evlist *evlist __maybe_unused)
 848 {
 849         char *buf = NULL;
 850         size_t len = 0;
 851         FILE *fp;
 852         struct cpu_map *node_map = NULL;
 853         char *c;
 854         u32 nr, i, j;
 855         int ret = -1;
 856
 857         fp = fopen("/sys/devices/system/node/online", "r");
 858         if (!fp)
 859                 return -1;
 860
 861         if (getline(&buf, &len, fp) <= 0)
 862                 goto done;
 863
 864         c = strchr(buf, '\n');
 865         if (c)
 866                 *c = '\0';
 867
 868         node_map = cpu_map__new(buf);
 869         if (!node_map)
 870                 goto done;
 871
 872         nr = (u32)node_map->nr;
 873
 874         ret = do_write(ff, &nr, sizeof(nr));
 875         if (ret < 0)
 876                 goto done;
 877
 878         for (i = 0; i < nr; i++) {
 879                 j = (u32)node_map->map[i];
 880                 ret = do_write(ff, &j, sizeof(j));
 881                 if (ret < 0)
 882                         break;
 883
 884                 ret = write_topo_node(ff, i);
 885                 if (ret < 0)
 886                         break;
 887         }
 888 done:
 889         free(buf);
 890         fclose(fp);
 891         cpu_map__put(node_map);
 892         return ret;
 893 }
 894
 895 /*
 896  * File format:
 897  *
 898  * struct pmu_mappings {
 899  *      u32     pmu_num;
 900  *      struct pmu_map {
 901  *              u32     type;
 902  *              char    name[];
 903  *      }[pmu_num];
 904  * };
 905  */
 906
 907 static int write_pmu_mappings(struct feat_fd *ff,
 908                               struct perf_evlist *evlist __maybe_unused)
 909 {
 910         struct perf_pmu *pmu = NULL;
 911         u32 pmu_num = 0;
 912         int ret;
 913
 914         /*
 915          * Do a first pass to count number of pmu to avoid lseek so this
 916          * works in pipe mode as well.
 917          */
 918         while ((pmu = perf_pmu__scan(pmu))) {
 919                 if (!pmu->name)
 920                         continue;
 921                 pmu_num++;
 922         }
 923
 924         ret = do_write(ff, &pmu_num, sizeof(pmu_num));
 925         if (ret < 0)
 926                 return ret;
 927
 928         while ((pmu = perf_pmu__scan(pmu))) {
 929                 if (!pmu->name)
 930                         continue;
 931
 932                 ret = do_write(ff, &pmu->type, sizeof(pmu->type));
 933                 if (ret < 0)
 934                         return ret;
 935
 936                 ret = do_write_string(ff, pmu->name);
 937                 if (ret < 0)
 938                         return ret;
 939         }
 940
 941         return 0;
 942 }
 943
 944 /*
 945  * File format:
 946  *
 947  * struct group_descs {
 948  *      u32     nr_groups;
 949  *      struct group_desc {
 950  *              char    name[];
 951  *              u32     leader_idx;
 952  *              u32     nr_members;
 953  *      }[nr_groups];
 954  * };
 955  */
 956 static int write_group_desc(struct feat_fd *ff,
 957                             struct perf_evlist *evlist)
 958 {
 959         u32 nr_groups = evlist->nr_groups;
 960         struct perf_evsel *evsel;
 961         int ret;
 962
 963         ret = do_write(ff, &nr_groups, sizeof(nr_groups));
 964         if (ret < 0)
 965                 return ret;
 966
 967         evlist__for_each_entry(evlist, evsel) {
 968                 if (perf_evsel__is_group_leader(evsel) &&
 969                     evsel->nr_members > 1) {
 970                         const char *name = evsel->group_name ?: "{anon_group}";
 971                         u32 leader_idx = evsel->idx;
 972                         u32 nr_members = evsel->nr_members;
 973
 974                         ret = do_write_string(ff, name);
 975                         if (ret < 0)
 976                                 return ret;
 977
 978                         ret = do_write(ff, &leader_idx, sizeof(leader_idx));
 979                         if (ret < 0)
 980                                 return ret;
 981
 982                         ret = do_write(ff, &nr_members, sizeof(nr_members));
 983                         if (ret < 0)
 984                                 return ret;
 985                 }
 986         }
 987         return 0;
 988 }
 989
 990 /*
 991  * default get_cpuid(): nothing gets recorded
 992  * actual implementation must be in arch/$(SRCARCH)/util/header.c
 993  */
 994 int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)
 995 {
 996         return -1;
 997 }
 998
 999 static int write_cpuid(struct feat_fd *ff,
1000                        struct perf_evlist *evlist __maybe_unused)
1001 {
1002         char buffer[64];
1003         int ret;
1004
1005         ret = get_cpuid(buffer, sizeof(buffer));
1006         if (!ret)
1007                 goto write_it;
1008
1009         return -1;
1010 write_it:
1011         return do_write_string(ff, buffer);
1012 }
1013
1014 static int write_branch_stack(struct feat_fd *ff __maybe_unused,
1015                               struct perf_evlist *evlist __maybe_unused)
1016 {
1017         return 0;
1018 }
1019
1020 static int write_auxtrace(struct feat_fd *ff,
1021                           struct perf_evlist *evlist __maybe_unused)
1022 {
1023         struct perf_session *session;
1024         int err;
1025
1026         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
1027                 return -1;
1028
1029         session = container_of(ff->ph, struct perf_session, header);
1030
1031         err = auxtrace_index__write(ff->fd, &session->auxtrace_index);
1032         if (err < 0)
1033                 pr_err("Failed to write auxtrace index\n");
1034         return err;
1035 }
1036
1037 static int cpu_cache_level__sort(const void *a, const void *b)
1038 {
1039         struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
1040         struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
1041
1042         return cache_a->level - cache_b->level;
1043 }
1044
1045 static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
1046 {
1047         if (a->level != b->level)
1048                 return false;
1049
1050         if (a->line_size != b->line_size)
1051                 return false;
1052
1053         if (a->sets != b->sets)
1054                 return false;
1055
1056         if (a->ways != b->ways)
1057                 return false;
1058
1059         if (strcmp(a->type, b->type))
1060                 return false;
1061
1062         if (strcmp(a->size, b->size))
1063                 return false;
1064
1065         if (strcmp(a->map, b->map))
1066                 return false;
1067
1068         return true;
1069 }
1070
1071 static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
1072 {
1073         char path[PATH_MAX], file[PATH_MAX];
1074         struct stat st;
1075         size_t len;
1076
1077         scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
1078         scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
1079
1080         if (stat(file, &st))
1081                 return 1;
1082
1083         scnprintf(file, PATH_MAX, "%s/level", path);
1084         if (sysfs__read_int(file, (int *) &cache->level))
1085                 return -1;
1086
1087         scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
1088         if (sysfs__read_int(file, (int *) &cache->line_size))
1089                 return -1;
1090
1091         scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
1092         if (sysfs__read_int(file, (int *) &cache->sets))
1093                 return -1;
1094
1095         scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
1096         if (sysfs__read_int(file, (int *) &cache->ways))
1097                 return -1;
1098
1099         scnprintf(file, PATH_MAX, "%s/type", path);
1100         if (sysfs__read_str(file, &cache->type, &len))
1101                 return -1;
1102
1103         cache->type[len] = 0;
1104         cache->type = rtrim(cache->type);
1105
1106         scnprintf(file, PATH_MAX, "%s/size", path);
1107         if (sysfs__read_str(file, &cache->size, &len)) {
1108                 free(cache->type);
1109                 return -1;
1110         }
1111
1112         cache->size[len] = 0;
1113         cache->size = rtrim(cache->size);
1114
1115         scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
1116         if (sysfs__read_str(file, &cache->map, &len)) {
1117                 free(cache->map);
1118                 free(cache->type);
1119                 return -1;
1120         }
1121
1122         cache->map[len] = 0;
1123         cache->map = rtrim(cache->map);
1124         return 0;
1125 }
1126
1127 static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
1128 {
1129         fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
1130 }
1131
1132 static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
1133 {
1134         u32 i, cnt = 0;
1135         long ncpus;
1136         u32 nr, cpu;
1137         u16 level;
1138
1139         ncpus = sysconf(_SC_NPROCESSORS_CONF);
1140         if (ncpus < 0)
1141                 return -1;
1142
1143         nr = (u32)(ncpus & UINT_MAX);
1144
1145         for (cpu = 0; cpu < nr; cpu++) {
1146                 for (level = 0; level < 10; level++) {
1147                         struct cpu_cache_level c;
1148                         int err;
1149
1150                         err = cpu_cache_level__read(&c, cpu, level);
1151                         if (err < 0)
1152                                 return err;
1153
1154                         if (err == 1)
1155                                 break;
1156
1157                         for (i = 0; i < cnt; i++) {
1158                                 if (cpu_cache_level__cmp(&c, &caches[i]))
1159                                         break;
1160                         }
1161
1162                         if (i == cnt)
1163                                 caches[cnt++] = c;
1164                         else
1165                                 cpu_cache_level__free(&c);
1166
1167                         if (WARN_ONCE(cnt == size, "way too many cpu caches.."))
1168                                 goto out;
1169                 }
1170         }
1171  out:
1172         *cntp = cnt;
1173         return 0;
1174 }
1175
1176 #define MAX_CACHES 2000
1177
1178 static int write_cache(struct feat_fd *ff,
1179                        struct perf_evlist *evlist __maybe_unused)
1180 {
1181         struct cpu_cache_level caches[MAX_CACHES];
1182         u32 cnt = 0, i, version = 1;
1183         int ret;
1184
1185         ret = build_caches(caches, MAX_CACHES, &cnt);
1186         if (ret)
1187                 goto out;
1188
1189         qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1190
1191         ret = do_write(ff, &version, sizeof(u32));
1192         if (ret < 0)
1193                 goto out;
1194
1195         ret = do_write(ff, &cnt, sizeof(u32));
1196         if (ret < 0)
1197                 goto out;
1198
1199         for (i = 0; i < cnt; i++) {
1200                 struct cpu_cache_level *c = &caches[i];
1201
1202                 #define _W(v)                                   \
1203                         ret = do_write(ff, &c->v, sizeof(u32)); \
1204                         if (ret < 0)                            \
1205                                 goto out;
1206
1207                 _W(level)
1208                 _W(line_size)
1209                 _W(sets)
1210                 _W(ways)
1211                 #undef _W
1212
1213                 #define _W(v)                                           \
1214                         ret = do_write_string(ff, (const char *) c->v); \
1215                         if (ret < 0)                                    \
1216                                 goto out;
1217
1218                 _W(type)
1219                 _W(size)
1220                 _W(map)
1221                 #undef _W
1222         }
1223
1224 out:
1225         for (i = 0; i < cnt; i++)
1226                 cpu_cache_level__free(&caches[i]);
1227         return ret;
1228 }
1229
1230 static int write_stat(struct feat_fd *ff __maybe_unused,
1231                       struct perf_evlist *evlist __maybe_unused)
1232 {
1233         return 0;
1234 }
1235
1236 static int write_sample_time(struct feat_fd *ff,
1237                              struct perf_evlist *evlist)
1238 {
1239         int ret;
1240
1241         ret = do_write(ff, &evlist->first_sample_time,
1242                        sizeof(evlist->first_sample_time));
1243         if (ret < 0)
1244                 return ret;
1245
1246         return do_write(ff, &evlist->last_sample_time,
1247                         sizeof(evlist->last_sample_time));
1248 }
1249
1250
1251 static int memory_node__read(struct memory_node *n, unsigned long idx)
1252 {
1253         unsigned int phys, size = 0;
1254         char path[PATH_MAX];
1255         struct dirent *ent;
1256         DIR *dir;
1257
1258 #define for_each_memory(mem, dir)                                       \
1259         while ((ent = readdir(dir)))                                    \
1260                 if (strcmp(ent->d_name, ".") &&                         \
1261                     strcmp(ent->d_name, "..") &&                        \
1262                     sscanf(ent->d_name, "memory%u", &mem) == 1)
1263
1264         scnprintf(path, PATH_MAX,
1265                   "%s/devices/system/node/node%lu",
1266                   sysfs__mountpoint(), idx);
1267
1268         dir = opendir(path);
1269         if (!dir) {
1270                 pr_warning("failed: cant' open memory sysfs data\n");
1271                 return -1;
1272         }
1273
1274         for_each_memory(phys, dir) {
1275                 size = max(phys, size);
1276         }
1277
1278         size++;
1279
1280         n->set = bitmap_alloc(size);
1281         if (!n->set) {
1282                 closedir(dir);
1283                 return -ENOMEM;
1284         }
1285
1286         n->node = idx;
1287         n->size = size;
1288
1289         rewinddir(dir);
1290
1291         for_each_memory(phys, dir) {
1292                 set_bit(phys, n->set);
1293         }
1294
1295         closedir(dir);
1296         return 0;
1297 }
1298
1299 static int memory_node__sort(const void *a, const void *b)
1300 {
1301         const struct memory_node *na = a;
1302         const struct memory_node *nb = b;
1303
1304         return na->node - nb->node;
1305 }
1306
1307 static int build_mem_topology(struct memory_node *nodes, u64 size, u64 *cntp)
1308 {
1309         char path[PATH_MAX];
1310         struct dirent *ent;
1311         DIR *dir;
1312         u64 cnt = 0;
1313         int ret = 0;
1314
1315         scnprintf(path, PATH_MAX, "%s/devices/system/node/",
1316                   sysfs__mountpoint());
1317
1318         dir = opendir(path);
1319         if (!dir) {
1320                 pr_debug2("%s: could't read %s, does this arch have topology information?\n",
1321                           __func__, path);
1322                 return -1;
1323         }
1324
1325         while (!ret && (ent = readdir(dir))) {
1326                 unsigned int idx;
1327                 int r;
1328
1329                 if (!strcmp(ent->d_name, ".") ||
1330                     !strcmp(ent->d_name, ".."))
1331                         continue;
1332
1333                 r = sscanf(ent->d_name, "node%u", &idx);
1334                 if (r != 1)
1335                         continue;
1336
1337                 if (WARN_ONCE(cnt >= size,
1338                               "failed to write MEM_TOPOLOGY, way too many nodes\n"))
1339                         return -1;
1340
1341                 ret = memory_node__read(&nodes[cnt++], idx);
1342         }
1343
1344         *cntp = cnt;
1345         closedir(dir);
1346
1347         if (!ret)
1348                 qsort(nodes, cnt, sizeof(nodes[0]), memory_node__sort);
1349
1350         return ret;
1351 }
1352
1353 #define MAX_MEMORY_NODES 2000
1354
1355 /*
1356  * The MEM_TOPOLOGY holds physical memory map for every
1357  * node in system. The format of data is as follows:
1358  *
1359  *  0 - version          | for future changes
1360  *  8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
1361  * 16 - count            | number of nodes
1362  *
1363  * For each node we store map of physical indexes for
1364  * each node:
1365  *
1366  * 32 - node id          | node index
1367  * 40 - size             | size of bitmap
1368  * 48 - bitmap           | bitmap of memory indexes that belongs to node
1369  */
1370 static int write_mem_topology(struct feat_fd *ff __maybe_unused,
1371                               struct perf_evlist *evlist __maybe_unused)
1372 {
1373         static struct memory_node nodes[MAX_MEMORY_NODES];
1374         u64 bsize, version = 1, i, nr;
1375         int ret;
1376
1377         ret = sysfs__read_xll("devices/system/memory/block_size_bytes",
1378                               (unsigned long long *) &bsize);
1379         if (ret)
1380                 return ret;
1381
1382         ret = build_mem_topology(&nodes[0], MAX_MEMORY_NODES, &nr);
1383         if (ret)
1384                 return ret;
1385
1386         ret = do_write(ff, &version, sizeof(version));
1387         if (ret < 0)
1388                 goto out;
1389
1390         ret = do_write(ff, &bsize, sizeof(bsize));
1391         if (ret < 0)
1392                 goto out;
1393
1394         ret = do_write(ff, &nr, sizeof(nr));
1395         if (ret < 0)
1396                 goto out;
1397
1398         for (i = 0; i < nr; i++) {
1399                 struct memory_node *n = &nodes[i];
1400
1401                 #define _W(v)                                           \
1402                         ret = do_write(ff, &n->v, sizeof(n->v));        \
1403                         if (ret < 0)                                    \
1404                                 goto out;
1405
1406                 _W(node)
1407                 _W(size)
1408
1409                 #undef _W
1410
1411                 ret = do_write_bitmap(ff, n->set, n->size);
1412                 if (ret < 0)
1413                         goto out;
1414         }
1415
1416 out:
1417         return ret;
1418 }
1419
1420 static void print_hostname(struct feat_fd *ff, FILE *fp)
1421 {
1422         fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
1423 }
1424
1425 static void print_osrelease(struct feat_fd *ff, FILE *fp)
1426 {
1427         fprintf(fp, "# os release : %s\n", ff->ph->env.os_release);
1428 }
1429
1430 static void print_arch(struct feat_fd *ff, FILE *fp)
1431 {
1432         fprintf(fp, "# arch : %s\n", ff->ph->env.arch);
1433 }
1434
1435 static void print_cpudesc(struct feat_fd *ff, FILE *fp)
1436 {
1437         fprintf(fp, "# cpudesc : %s\n", ff->ph->env.cpu_desc);
1438 }
1439
1440 static void print_nrcpus(struct feat_fd *ff, FILE *fp)
1441 {
1442         fprintf(fp, "# nrcpus online : %u\n", ff->ph->env.nr_cpus_online);
1443         fprintf(fp, "# nrcpus avail : %u\n", ff->ph->env.nr_cpus_avail);
1444 }
1445
1446 static void print_version(struct feat_fd *ff, FILE *fp)
1447 {
1448         fprintf(fp, "# perf version : %s\n", ff->ph->env.version);
1449 }
1450
1451 static void print_cmdline(struct feat_fd *ff, FILE *fp)
1452 {
1453         int nr, i;
1454
1455         nr = ff->ph->env.nr_cmdline;
1456
1457         fprintf(fp, "# cmdline : ");
1458
1459         for (i = 0; i < nr; i++) {
1460                 char *argv_i = strdup(ff->ph->env.cmdline_argv[i]);
1461                 if (!argv_i) {
1462                         fprintf(fp, "%s ", ff->ph->env.cmdline_argv[i]);
1463                 } else {
1464                         char *mem = argv_i;
1465                         do {
1466                                 char *quote = strchr(argv_i, '\'');
1467                                 if (!quote)
1468                                         break;
1469                                 *quote++ = '\0';
1470                                 fprintf(fp, "%s\\\'", argv_i);
1471                                 argv_i = quote;
1472                         } while (1);
1473                         fprintf(fp, "%s ", argv_i);
1474                         free(mem);
1475                 }
1476         }
1477         fputc('\n', fp);
1478 }
1479
1480 static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
1481 {
1482         struct perf_header *ph = ff->ph;
1483         int cpu_nr = ph->env.nr_cpus_avail;
1484         int nr, i;
1485         char *str;
1486
1487         nr = ph->env.nr_sibling_cores;
1488         str = ph->env.sibling_cores;
1489
1490         for (i = 0; i < nr; i++) {
1491                 fprintf(fp, "# sibling cores   : %s\n", str);
1492                 str += strlen(str) + 1;
1493         }
1494
1495         nr = ph->env.nr_sibling_threads;
1496         str = ph->env.sibling_threads;
1497
1498         for (i = 0; i < nr; i++) {
1499                 fprintf(fp, "# sibling threads : %s\n", str);
1500                 str += strlen(str) + 1;
1501         }
1502
1503         if (ph->env.cpu != NULL) {
1504                 for (i = 0; i < cpu_nr; i++)
1505                         fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
1506                                 ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
1507         } else
1508                 fprintf(fp, "# Core ID and Socket ID information is not available\n");
1509 }
1510
1511 static void free_event_desc(struct perf_evsel *events)
1512 {
1513         struct perf_evsel *evsel;
1514
1515         if (!events)
1516                 return;
1517
1518         for (evsel = events; evsel->attr.size; evsel++) {
1519                 zfree(&evsel->name);
1520                 zfree(&evsel->id);
1521         }
1522
1523         free(events);
1524 }
1525
1526 static struct perf_evsel *read_event_desc(struct feat_fd *ff)
1527 {
1528         struct perf_evsel *evsel, *events = NULL;
1529         u64 *id;
1530         void *buf = NULL;
1531         u32 nre, sz, nr, i, j;
1532         size_t msz;
1533
1534         /* number of events */
1535         if (do_read_u32(ff, &nre))
1536                 goto error;
1537
1538         if (do_read_u32(ff, &sz))
1539                 goto error;
1540
1541         /* buffer to hold on file attr struct */
1542         buf = malloc(sz);
1543         if (!buf)
1544                 goto error;
1545
1546         /* the last event terminates with evsel->attr.size == 0: */
1547         events = calloc(nre + 1, sizeof(*events));
1548         if (!events)
1549                 goto error;
1550
1551         msz = sizeof(evsel->attr);
1552         if (sz < msz)
1553                 msz = sz;
1554
1555         for (i = 0, evsel = events; i < nre; evsel++, i++) {
1556                 evsel->idx = i;
1557
1558                 /*
1559                  * must read entire on-file attr struct to
1560                  * sync up with layout.
1561                  */
1562                 if (__do_read(ff, buf, sz))
1563                         goto error;
1564
1565                 if (ff->ph->needs_swap)
1566                         perf_event__attr_swap(buf);
1567
1568                 memcpy(&evsel->attr, buf, msz);
1569
1570                 if (do_read_u32(ff, &nr))
1571                         goto error;
1572
1573                 if (ff->ph->needs_swap)
1574                         evsel->needs_swap = true;
1575
1576                 evsel->name = do_read_string(ff);
1577                 if (!evsel->name)
1578                         goto error;
1579
1580                 if (!nr)
1581                         continue;
1582
1583                 id = calloc(nr, sizeof(*id));
1584                 if (!id)
1585                         goto error;
1586                 evsel->ids = nr;
1587                 evsel->id = id;
1588
1589                 for (j = 0 ; j < nr; j++) {
1590                         if (do_read_u64(ff, id))
1591                                 goto error;
1592                         id++;
1593                 }
1594         }
1595 out:
1596         free(buf);
1597         return events;
1598 error:
1599         free_event_desc(events);
1600         events = NULL;
1601         goto out;
1602 }
1603
1604 static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1605                                 void *priv __maybe_unused)
1606 {
1607         return fprintf(fp, ", %s = %s", name, val);
1608 }
1609
1610 static void print_event_desc(struct feat_fd *ff, FILE *fp)
1611 {
1612         struct perf_evsel *evsel, *events;
1613         u32 j;
1614         u64 *id;
1615
1616         if (ff->events)
1617                 events = ff->events;
1618         else
1619                 events = read_event_desc(ff);
1620
1621         if (!events) {
1622                 fprintf(fp, "# event desc: not available or unable to read\n");
1623                 return;
1624         }
1625
1626         for (evsel = events; evsel->attr.size; evsel++) {
1627                 fprintf(fp, "# event : name = %s, ", evsel->name);
1628
1629                 if (evsel->ids) {
1630                         fprintf(fp, ", id = {");
1631                         for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1632                                 if (j)
1633                                         fputc(',', fp);
1634                                 fprintf(fp, " %"PRIu64, *id);
1635                         }
1636                         fprintf(fp, " }");
1637                 }
1638
1639                 perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1640
1641                 fputc('\n', fp);
1642         }
1643
1644         free_event_desc(events);
1645         ff->events = NULL;
1646 }
1647
1648 static void print_total_mem(struct feat_fd *ff, FILE *fp)
1649 {
1650         fprintf(fp, "# total memory : %llu kB\n", ff->ph->env.total_mem);
1651 }
1652
1653 static void print_numa_topology(struct feat_fd *ff, FILE *fp)
1654 {
1655         int i;
1656         struct numa_node *n;
1657
1658         for (i = 0; i < ff->ph->env.nr_numa_nodes; i++) {
1659                 n = &ff->ph->env.numa_nodes[i];
1660
1661                 fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
1662                             " free = %"PRIu64" kB\n",
1663                         n->node, n->mem_total, n->mem_free);
1664
1665                 fprintf(fp, "# node%u cpu list : ", n->node);
1666                 cpu_map__fprintf(n->map, fp);
1667         }
1668 }
1669
1670 static void print_cpuid(struct feat_fd *ff, FILE *fp)
1671 {
1672         fprintf(fp, "# cpuid : %s\n", ff->ph->env.cpuid);
1673 }
1674
1675 static void print_branch_stack(struct feat_fd *ff __maybe_unused, FILE *fp)
1676 {
1677         fprintf(fp, "# contains samples with branch stack\n");
1678 }
1679
1680 static void print_auxtrace(struct feat_fd *ff __maybe_unused, FILE *fp)
1681 {
1682         fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1683 }
1684
1685 static void print_stat(struct feat_fd *ff __maybe_unused, FILE *fp)
1686 {
1687         fprintf(fp, "# contains stat data\n");
1688 }
1689
1690 static void print_cache(struct feat_fd *ff, FILE *fp __maybe_unused)
1691 {
1692         int i;
1693
1694         fprintf(fp, "# CPU cache info:\n");
1695         for (i = 0; i < ff->ph->env.caches_cnt; i++) {
1696                 fprintf(fp, "#  ");
1697                 cpu_cache_level__fprintf(fp, &ff->ph->env.caches[i]);
1698         }
1699 }
1700
1701 static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
1702 {
1703         const char *delimiter = "# pmu mappings: ";
1704         char *str, *tmp;
1705         u32 pmu_num;
1706         u32 type;
1707
1708         pmu_num = ff->ph->env.nr_pmu_mappings;
1709         if (!pmu_num) {
1710                 fprintf(fp, "# pmu mappings: not available\n");
1711                 return;
1712         }
1713
1714         str = ff->ph->env.pmu_mappings;
1715
1716         while (pmu_num) {
1717                 type = strtoul(str, &tmp, 0);
1718                 if (*tmp != ':')
1719                         goto error;
1720
1721                 str = tmp + 1;
1722                 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1723
1724                 delimiter = ", ";
1725                 str += strlen(str) + 1;
1726                 pmu_num--;
1727         }
1728
1729         fprintf(fp, "\n");
1730
1731         if (!pmu_num)
1732                 return;
1733 error:
1734         fprintf(fp, "# pmu mappings: unable to read\n");
1735 }
1736
1737 static void print_group_desc(struct feat_fd *ff, FILE *fp)
1738 {
1739         struct perf_session *session;
1740         struct perf_evsel *evsel;
1741         u32 nr = 0;
1742
1743         session = container_of(ff->ph, struct perf_session, header);
1744
1745         evlist__for_each_entry(session->evlist, evsel) {
1746                 if (perf_evsel__is_group_leader(evsel) &&
1747                     evsel->nr_members > 1) {
1748                         fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1749                                 perf_evsel__name(evsel));
1750
1751                         nr = evsel->nr_members - 1;
1752                 } else if (nr) {
1753                         fprintf(fp, ",%s", perf_evsel__name(evsel));
1754
1755                         if (--nr == 0)
1756                                 fprintf(fp, "}\n");
1757                 }
1758         }
1759 }
1760
1761 static void print_sample_time(struct feat_fd *ff, FILE *fp)
1762 {
1763         struct perf_session *session;
1764         char time_buf[32];
1765         double d;
1766
1767         session = container_of(ff->ph, struct perf_session, header);
1768
1769         timestamp__scnprintf_usec(session->evlist->first_sample_time,
1770                                   time_buf, sizeof(time_buf));
1771         fprintf(fp, "# time of first sample : %s\n", time_buf);
1772
1773         timestamp__scnprintf_usec(session->evlist->last_sample_time,
1774                                   time_buf, sizeof(time_buf));
1775         fprintf(fp, "# time of last sample : %s\n", time_buf);
1776
1777         d = (double)(session->evlist->last_sample_time -
1778                 session->evlist->first_sample_time) / NSEC_PER_MSEC;
1779
1780         fprintf(fp, "# sample duration : %10.3f ms\n", d);
1781 }
1782
1783 static void memory_node__fprintf(struct memory_node *n,
1784                                  unsigned long long bsize, FILE *fp)
1785 {
1786         char buf_map[100], buf_size[50];
1787         unsigned long long size;
1788
1789         size = bsize * bitmap_weight(n->set, n->size);
1790         unit_number__scnprintf(buf_size, 50, size);
1791
1792         bitmap_scnprintf(n->set, n->size, buf_map, 100);
1793         fprintf(fp, "#  %3" PRIu64 " [%s]: %s\n", n->node, buf_size, buf_map);
1794 }
1795
1796 static void print_mem_topology(struct feat_fd *ff, FILE *fp)
1797 {
1798         struct memory_node *nodes;
1799         int i, nr;
1800
1801         nodes = ff->ph->env.memory_nodes;
1802         nr    = ff->ph->env.nr_memory_nodes;
1803
1804         fprintf(fp, "# memory nodes (nr %d, block size 0x%llx):\n",
1805                 nr, ff->ph->env.memory_bsize);
1806
1807         for (i = 0; i < nr; i++) {
1808                 memory_node__fprintf(&nodes[i], ff->ph->env.memory_bsize, fp);
1809         }
1810 }
1811
1812 static int __event_process_build_id(struct build_id_event *bev,
1813                                     char *filename,
1814                                     struct perf_session *session)
1815 {
1816         int err = -1;
1817         struct machine *machine;
1818         u16 cpumode;
1819         struct dso *dso;
1820         enum dso_kernel_type dso_type;
1821
1822         machine = perf_session__findnew_machine(session, bev->pid);
1823         if (!machine)
1824                 goto out;
1825
1826         cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1827
1828         switch (cpumode) {
1829         case PERF_RECORD_MISC_KERNEL:
1830                 dso_type = DSO_TYPE_KERNEL;
1831                 break;
1832         case PERF_RECORD_MISC_GUEST_KERNEL:
1833                 dso_type = DSO_TYPE_GUEST_KERNEL;
1834                 break;
1835         case PERF_RECORD_MISC_USER:
1836         case PERF_RECORD_MISC_GUEST_USER:
1837                 dso_type = DSO_TYPE_USER;
1838                 break;
1839         default:
1840                 goto out;
1841         }
1842
1843         dso = machine__findnew_dso(machine, filename);
1844         if (dso != NULL) {
1845                 char sbuild_id[SBUILD_ID_SIZE];
1846
1847                 dso__set_build_id(dso, &bev->build_id);
1848
1849                 if (dso_type != DSO_TYPE_USER) {
1850                         struct kmod_path m = { .name = NULL, };
1851
1852                         if (!kmod_path__parse_name(&m, filename) && m.kmod)
1853                                 dso__set_module_info(dso, &m, machine);
1854                         else
1855                                 dso->kernel = dso_type;
1856
1857                         free(m.name);
1858                 }
1859
1860                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1861                                   sbuild_id);
1862                 pr_debug("build id event received for %s: %s\n",
1863                          dso->long_name, sbuild_id);
1864                 dso__put(dso);
1865         }
1866
1867         err = 0;
1868 out:
1869         return err;
1870 }
1871
1872 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1873                                                  int input, u64 offset, u64 size)
1874 {
1875         struct perf_session *session = container_of(header, struct perf_session, header);
1876         struct {
1877                 struct perf_event_header   header;
1878                 u8                         build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1879                 char                       filename[0];
1880         } old_bev;
1881         struct build_id_event bev;
1882         char filename[PATH_MAX];
1883         u64 limit = offset + size;
1884
1885         while (offset < limit) {
1886                 ssize_t len;
1887
1888                 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1889                         return -1;
1890
1891                 if (header->needs_swap)
1892                         perf_event_header__bswap(&old_bev.header);
1893
1894                 len = old_bev.header.size - sizeof(old_bev);
1895                 if (readn(input, filename, len) != len)
1896                         return -1;
1897
1898                 bev.header = old_bev.header;
1899
1900                 /*
1901                  * As the pid is the missing value, we need to fill
1902                  * it properly. The header.misc value give us nice hint.
1903                  */
1904                 bev.pid = HOST_KERNEL_ID;
1905                 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1906                     bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1907                         bev.pid = DEFAULT_GUEST_KERNEL_ID;
1908
1909                 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1910                 __event_process_build_id(&bev, filename, session);
1911
1912                 offset += bev.header.size;
1913         }
1914
1915         return 0;
1916 }
1917
1918 static int perf_header__read_build_ids(struct perf_header *header,
1919                                        int input, u64 offset, u64 size)
1920 {
1921         struct perf_session *session = container_of(header, struct perf_session, header);
1922         struct build_id_event bev;
1923         char filename[PATH_MAX];
1924         u64 limit = offset + size, orig_offset = offset;
1925         int err = -1;
1926
1927         while (offset < limit) {
1928                 ssize_t len;
1929
1930                 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1931                         goto out;
1932
1933                 if (header->needs_swap)
1934                         perf_event_header__bswap(&bev.header);
1935
1936                 len = bev.header.size - sizeof(bev);
1937                 if (readn(input, filename, len) != len)
1938                         goto out;
1939                 /*
1940                  * The a1645ce1 changeset:
1941                  *
1942                  * "perf: 'perf kvm' tool for monitoring guest performance from host"
1943                  *
1944                  * Added a field to struct build_id_event that broke the file
1945                  * format.
1946                  *
1947                  * Since the kernel build-id is the first entry, process the
1948                  * table using the old format if the well known
1949                  * '[kernel.kallsyms]' string for the kernel build-id has the
1950                  * first 4 characters chopped off (where the pid_t sits).
1951                  */
1952                 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1953                         if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1954                                 return -1;
1955                         return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1956                 }
1957
1958                 __event_process_build_id(&bev, filename, session);
1959
1960                 offset += bev.header.size;
1961         }
1962         err = 0;
1963 out:
1964         return err;
1965 }
1966
1967 /* Macro for features that simply need to read and store a string. */
1968 #define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
1969 static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
1970 {\
1971         ff->ph->env.__feat_env = do_read_string(ff); \
1972         return ff->ph->env.__feat_env ? 0 : -ENOMEM; \
1973 }
1974
1975 FEAT_PROCESS_STR_FUN(hostname, hostname);
1976 FEAT_PROCESS_STR_FUN(osrelease, os_release);
1977 FEAT_PROCESS_STR_FUN(version, version);
1978 FEAT_PROCESS_STR_FUN(arch, arch);
1979 FEAT_PROCESS_STR_FUN(cpudesc, cpu_desc);
1980 FEAT_PROCESS_STR_FUN(cpuid, cpuid);
1981
1982 static int process_tracing_data(struct feat_fd *ff, void *data)
1983 {
1984         ssize_t ret = trace_report(ff->fd, data, false);
1985
1986         return ret < 0 ? -1 : 0;
1987 }
1988
1989 static int process_build_id(struct feat_fd *ff, void *data __maybe_unused)
1990 {
1991         if (perf_header__read_build_ids(ff->ph, ff->fd, ff->offset, ff->size))
1992                 pr_debug("Failed to read buildids, continuing...\n");
1993         return 0;
1994 }
1995
1996 static int process_nrcpus(struct feat_fd *ff, void *data __maybe_unused)
1997 {
1998         int ret;
1999         u32 nr_cpus_avail, nr_cpus_online;
2000
2001         ret = do_read_u32(ff, &nr_cpus_avail);
2002         if (ret)
2003                 return ret;
2004
2005         ret = do_read_u32(ff, &nr_cpus_online);
2006         if (ret)
2007                 return ret;
2008         ff->ph->env.nr_cpus_avail = (int)nr_cpus_avail;
2009         ff->ph->env.nr_cpus_online = (int)nr_cpus_online;
2010         return 0;
2011 }
2012
2013 static int process_total_mem(struct feat_fd *ff, void *data __maybe_unused)
2014 {
2015         u64 total_mem;
2016         int ret;
2017
2018         ret = do_read_u64(ff, &total_mem);
2019         if (ret)
2020                 return -1;
2021         ff->ph->env.total_mem = (unsigned long long)total_mem;
2022         return 0;
2023 }
2024
2025 static struct perf_evsel *
2026 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
2027 {
2028         struct perf_evsel *evsel;
2029
2030         evlist__for_each_entry(evlist, evsel) {
2031                 if (evsel->idx == idx)
2032                         return evsel;
2033         }
2034
2035         return NULL;
2036 }
2037
2038 static void
2039 perf_evlist__set_event_name(struct perf_evlist *evlist,
2040                             struct perf_evsel *event)
2041 {
2042         struct perf_evsel *evsel;
2043
2044         if (!event->name)
2045                 return;
2046
2047         evsel = perf_evlist__find_by_index(evlist, event->idx);
2048         if (!evsel)
2049                 return;
2050
2051         if (evsel->name)
2052                 return;
2053
2054         evsel->name = strdup(event->name);
2055 }
2056
2057 static int
2058 process_event_desc(struct feat_fd *ff, void *data __maybe_unused)
2059 {
2060         struct perf_session *session;
2061         struct perf_evsel *evsel, *events = read_event_desc(ff);
2062
2063         if (!events)
2064                 return 0;
2065
2066         session = container_of(ff->ph, struct perf_session, header);
2067
2068         if (session->data->is_pipe) {
2069                 /* Save events for reading later by print_event_desc,
2070                  * since they can't be read again in pipe mode. */
2071                 ff->events = events;
2072         }
2073
2074         for (evsel = events; evsel->attr.size; evsel++)
2075                 perf_evlist__set_event_name(session->evlist, evsel);
2076
2077         if (!session->data->is_pipe)
2078                 free_event_desc(events);
2079
2080         return 0;
2081 }
2082
2083 static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)
2084 {
2085         char *str, *cmdline = NULL, **argv = NULL;
2086         u32 nr, i, len = 0;
2087
2088         if (do_read_u32(ff, &nr))
2089                 return -1;
2090
2091         ff->ph->env.nr_cmdline = nr;
2092
2093         cmdline = zalloc(ff->size + nr + 1);
2094         if (!cmdline)
2095                 return -1;
2096
2097         argv = zalloc(sizeof(char *) * (nr + 1));
2098         if (!argv)
2099                 goto error;
2100
2101         for (i = 0; i < nr; i++) {
2102                 str = do_read_string(ff);
2103                 if (!str)
2104                         goto error;
2105
2106                 argv[i] = cmdline + len;
2107                 memcpy(argv[i], str, strlen(str) + 1);
2108                 len += strlen(str) + 1;
2109                 free(str);
2110         }
2111         ff->ph->env.cmdline = cmdline;
2112         ff->ph->env.cmdline_argv = (const char **) argv;
2113         return 0;
2114
2115 error:
2116         free(argv);
2117         free(cmdline);
2118         return -1;
2119 }
2120
2121 static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
2122 {
2123         u32 nr, i;
2124         char *str;
2125         struct strbuf sb;
2126         int cpu_nr = ff->ph->env.nr_cpus_avail;
2127         u64 size = 0;
2128         struct perf_header *ph = ff->ph;
2129         bool do_core_id_test = true;
2130
2131         ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
2132         if (!ph->env.cpu)
2133                 return -1;
2134
2135         if (do_read_u32(ff, &nr))
2136                 goto free_cpu;
2137
2138         ph->env.nr_sibling_cores = nr;
2139         size += sizeof(u32);
2140         if (strbuf_init(&sb, 128) < 0)
2141                 goto free_cpu;
2142
2143         for (i = 0; i < nr; i++) {
2144                 str = do_read_string(ff);
2145                 if (!str)
2146                         goto error;
2147
2148                 /* include a NULL character at the end */
2149                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2150                         goto error;
2151                 size += string_size(str);
2152                 free(str);
2153         }
2154         ph->env.sibling_cores = strbuf_detach(&sb, NULL);
2155
2156         if (do_read_u32(ff, &nr))
2157                 return -1;
2158
2159         ph->env.nr_sibling_threads = nr;
2160         size += sizeof(u32);
2161
2162         for (i = 0; i < nr; i++) {
2163                 str = do_read_string(ff);
2164                 if (!str)
2165                         goto error;
2166
2167                 /* include a NULL character at the end */
2168                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2169                         goto error;
2170                 size += string_size(str);
2171                 free(str);
2172         }
2173         ph->env.sibling_threads = strbuf_detach(&sb, NULL);
2174
2175         /*
2176          * The header may be from old perf,
2177          * which doesn't include core id and socket id information.
2178          */
2179         if (ff->size <= size) {
2180                 zfree(&ph->env.cpu);
2181                 return 0;
2182         }
2183
2184         /* On s390 the socket_id number is not related to the numbers of cpus.
2185          * The socket_id number might be higher than the numbers of cpus.
2186          * This depends on the configuration.
2187          */
2188         if (ph->env.arch && !strncmp(ph->env.arch, "s390", 4))
2189                 do_core_id_test = false;
2190
2191         for (i = 0; i < (u32)cpu_nr; i++) {
2192                 if (do_read_u32(ff, &nr))
2193                         goto free_cpu;
2194
2195                 ph->env.cpu[i].core_id = nr;
2196
2197                 if (do_read_u32(ff, &nr))
2198                         goto free_cpu;
2199
2200                 if (do_core_id_test && nr != (u32)-1 && nr > (u32)cpu_nr) {
2201                         pr_debug("socket_id number is too big."
2202                                  "You may need to upgrade the perf tool.\n");
2203                         goto free_cpu;
2204                 }
2205
2206                 ph->env.cpu[i].socket_id = nr;
2207         }
2208
2209         return 0;
2210
2211 error:
2212         strbuf_release(&sb);
2213 free_cpu:
2214         zfree(&ph->env.cpu);
2215         return -1;
2216 }
2217
2218 static int process_numa_topology(struct feat_fd *ff, void *data __maybe_unused)
2219 {
2220         struct numa_node *nodes, *n;
2221         u32 nr, i;
2222         char *str;
2223
2224         /* nr nodes */
2225         if (do_read_u32(ff, &nr))
2226                 return -1;
2227
2228         nodes = zalloc(sizeof(*nodes) * nr);
2229         if (!nodes)
2230                 return -ENOMEM;
2231
2232         for (i = 0; i < nr; i++) {
2233                 n = &nodes[i];
2234
2235                 /* node number */
2236                 if (do_read_u32(ff, &n->node))
2237                         goto error;
2238
2239                 if (do_read_u64(ff, &n->mem_total))
2240                         goto error;
2241
2242                 if (do_read_u64(ff, &n->mem_free))
2243                         goto error;
2244
2245                 str = do_read_string(ff);
2246                 if (!str)
2247                         goto error;
2248
2249                 n->map = cpu_map__new(str);
2250                 if (!n->map)
2251                         goto error;
2252
2253                 free(str);
2254         }
2255         ff->ph->env.nr_numa_nodes = nr;
2256         ff->ph->env.numa_nodes = nodes;
2257         return 0;
2258
2259 error:
2260         free(nodes);
2261         return -1;
2262 }
2263
2264 static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)
2265 {
2266         char *name;
2267         u32 pmu_num;
2268         u32 type;
2269         struct strbuf sb;
2270
2271         if (do_read_u32(ff, &pmu_num))
2272                 return -1;
2273
2274         if (!pmu_num) {
2275                 pr_debug("pmu mappings not available\n");
2276                 return 0;
2277         }
2278
2279         ff->ph->env.nr_pmu_mappings = pmu_num;
2280         if (strbuf_init(&sb, 128) < 0)
2281                 return -1;
2282
2283         while (pmu_num) {
2284                 if (do_read_u32(ff, &type))
2285                         goto error;
2286
2287                 name = do_read_string(ff);
2288                 if (!name)
2289                         goto error;
2290
2291                 if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
2292                         goto error;
2293                 /* include a NULL character at the end */
2294                 if (strbuf_add(&sb, "", 1) < 0)
2295                         goto error;
2296
2297                 if (!strcmp(name, "msr"))
2298                         ff->ph->env.msr_pmu_type = type;
2299
2300                 free(name);
2301                 pmu_num--;
2302         }
2303         ff->ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
2304         return 0;
2305
2306 error:
2307         strbuf_release(&sb);
2308         return -1;
2309 }
2310
2311 static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)
2312 {
2313         size_t ret = -1;
2314         u32 i, nr, nr_groups;
2315         struct perf_session *session;
2316         struct perf_evsel *evsel, *leader = NULL;
2317         struct group_desc {
2318                 char *name;
2319                 u32 leader_idx;
2320                 u32 nr_members;
2321         } *desc;
2322
2323         if (do_read_u32(ff, &nr_groups))
2324                 return -1;
2325
2326         ff->ph->env.nr_groups = nr_groups;
2327         if (!nr_groups) {
2328                 pr_debug("group desc not available\n");
2329                 return 0;
2330         }
2331
2332         desc = calloc(nr_groups, sizeof(*desc));
2333         if (!desc)
2334                 return -1;
2335
2336         for (i = 0; i < nr_groups; i++) {
2337                 desc[i].name = do_read_string(ff);
2338                 if (!desc[i].name)
2339                         goto out_free;
2340
2341                 if (do_read_u32(ff, &desc[i].leader_idx))
2342                         goto out_free;
2343
2344                 if (do_read_u32(ff, &desc[i].nr_members))
2345                         goto out_free;
2346         }
2347
2348         /*
2349          * Rebuild group relationship based on the group_desc
2350          */
2351         session = container_of(ff->ph, struct perf_session, header);
2352         session->evlist->nr_groups = nr_groups;
2353
2354         i = nr = 0;
2355         evlist__for_each_entry(session->evlist, evsel) {
2356                 if (evsel->idx == (int) desc[i].leader_idx) {
2357                         evsel->leader = evsel;
2358                         /* {anon_group} is a dummy name */
2359                         if (strcmp(desc[i].name, "{anon_group}")) {
2360                                 evsel->group_name = desc[i].name;
2361                                 desc[i].name = NULL;
2362                         }
2363                         evsel->nr_members = desc[i].nr_members;
2364
2365                         if (i >= nr_groups || nr > 0) {
2366                                 pr_debug("invalid group desc\n");
2367                                 goto out_free;
2368                         }
2369
2370                         leader = evsel;
2371                         nr = evsel->nr_members - 1;
2372                         i++;
2373                 } else if (nr) {
2374                         /* This is a group member */
2375                         evsel->leader = leader;
2376
2377                         nr--;
2378                 }
2379         }
2380
2381         if (i != nr_groups || nr != 0) {
2382                 pr_debug("invalid group desc\n");
2383                 goto out_free;
2384         }
2385
2386         ret = 0;
2387 out_free:
2388         for (i = 0; i < nr_groups; i++)
2389                 zfree(&desc[i].name);
2390         free(desc);
2391
2392         return ret;
2393 }
2394
2395 static int process_auxtrace(struct feat_fd *ff, void *data __maybe_unused)
2396 {
2397         struct perf_session *session;
2398         int err;
2399
2400         session = container_of(ff->ph, struct perf_session, header);
2401
2402         err = auxtrace_index__process(ff->fd, ff->size, session,
2403                                       ff->ph->needs_swap);
2404         if (err < 0)
2405                 pr_err("Failed to process auxtrace index\n");
2406         return err;
2407 }
2408
2409 static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
2410 {
2411         struct cpu_cache_level *caches;
2412         u32 cnt, i, version;
2413
2414         if (do_read_u32(ff, &version))
2415                 return -1;
2416
2417         if (version != 1)
2418                 return -1;
2419
2420         if (do_read_u32(ff, &cnt))
2421                 return -1;
2422
2423         caches = zalloc(sizeof(*caches) * cnt);
2424         if (!caches)
2425                 return -1;
2426
2427         for (i = 0; i < cnt; i++) {
2428                 struct cpu_cache_level c;
2429
2430                 #define _R(v)                                           \
2431                         if (do_read_u32(ff, &c.v))\
2432                                 goto out_free_caches;                   \
2433
2434                 _R(level)
2435                 _R(line_size)
2436                 _R(sets)
2437                 _R(ways)
2438                 #undef _R
2439
2440                 #define _R(v)                                   \
2441                         c.v = do_read_string(ff);               \
2442                         if (!c.v)                               \
2443                                 goto out_free_caches;
2444
2445                 _R(type)
2446                 _R(size)
2447                 _R(map)
2448                 #undef _R
2449
2450                 caches[i] = c;
2451         }
2452
2453         ff->ph->env.caches = caches;
2454         ff->ph->env.caches_cnt = cnt;
2455         return 0;
2456 out_free_caches:
2457         free(caches);
2458         return -1;
2459 }
2460
2461 static int process_sample_time(struct feat_fd *ff, void *data __maybe_unused)
2462 {
2463         struct perf_session *session;
2464         u64 first_sample_time, last_sample_time;
2465         int ret;
2466
2467         session = container_of(ff->ph, struct perf_session, header);
2468
2469         ret = do_read_u64(ff, &first_sample_time);
2470         if (ret)
2471                 return -1;
2472
2473         ret = do_read_u64(ff, &last_sample_time);
2474         if (ret)
2475                 return -1;
2476
2477         session->evlist->first_sample_time = first_sample_time;
2478         session->evlist->last_sample_time = last_sample_time;
2479         return 0;
2480 }
2481
2482 static int process_mem_topology(struct feat_fd *ff,
2483                                 void *data __maybe_unused)
2484 {
2485         struct memory_node *nodes;
2486         u64 version, i, nr, bsize;
2487         int ret = -1;
2488
2489         if (do_read_u64(ff, &version))
2490                 return -1;
2491
2492         if (version != 1)
2493                 return -1;
2494
2495         if (do_read_u64(ff, &bsize))
2496                 return -1;
2497
2498         if (do_read_u64(ff, &nr))
2499                 return -1;
2500
2501         nodes = zalloc(sizeof(*nodes) * nr);
2502         if (!nodes)
2503                 return -1;
2504
2505         for (i = 0; i < nr; i++) {
2506                 struct memory_node n;
2507
2508                 #define _R(v)                           \
2509                         if (do_read_u64(ff, &n.v))      \
2510                                 goto out;               \
2511
2512                 _R(node)
2513                 _R(size)
2514
2515                 #undef _R
2516
2517                 if (do_read_bitmap(ff, &n.set, &n.size))
2518                         goto out;
2519
2520                 nodes[i] = n;
2521         }
2522
2523         ff->ph->env.memory_bsize    = bsize;
2524         ff->ph->env.memory_nodes    = nodes;
2525         ff->ph->env.nr_memory_nodes = nr;
2526         ret = 0;
2527
2528 out:
2529         if (ret)
2530                 free(nodes);
2531         return ret;
2532 }
2533
2534 struct feature_ops {
2535         int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
2536         void (*print)(struct feat_fd *ff, FILE *fp);
2537         int (*process)(struct feat_fd *ff, void *data);
2538         const char *name;
2539         bool full_only;
2540         bool synthesize;
2541 };
2542
2543 #define FEAT_OPR(n, func, __full_only) \
2544         [HEADER_##n] = {                                        \
2545                 .name       = __stringify(n),                   \
2546                 .write      = write_##func,                     \
2547                 .print      = print_##func,                     \
2548                 .full_only  = __full_only,                      \
2549                 .process    = process_##func,                   \
2550                 .synthesize = true                              \
2551         }
2552
2553 #define FEAT_OPN(n, func, __full_only) \
2554         [HEADER_##n] = {                                        \
2555                 .name       = __stringify(n),                   \
2556                 .write      = write_##func,                     \
2557                 .print      = print_##func,                     \
2558                 .full_only  = __full_only,                      \
2559                 .process    = process_##func                    \
2560         }
2561
2562 /* feature_ops not implemented: */
2563 #define print_tracing_data      NULL
2564 #define print_build_id          NULL
2565
2566 #define process_branch_stack    NULL
2567 #define process_stat            NULL
2568
2569
2570 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2571         FEAT_OPN(TRACING_DATA,  tracing_data,   false),
2572         FEAT_OPN(BUILD_ID,      build_id,       false),
2573         FEAT_OPR(HOSTNAME,      hostname,       false),
2574         FEAT_OPR(OSRELEASE,     osrelease,      false),
2575         FEAT_OPR(VERSION,       version,        false),
2576         FEAT_OPR(ARCH,          arch,           false),
2577         FEAT_OPR(NRCPUS,        nrcpus,         false),
2578         FEAT_OPR(CPUDESC,       cpudesc,        false),
2579         FEAT_OPR(CPUID,         cpuid,          false),
2580         FEAT_OPR(TOTAL_MEM,     total_mem,      false),
2581         FEAT_OPR(EVENT_DESC,    event_desc,     false),
2582         FEAT_OPR(CMDLINE,       cmdline,        false),
2583         FEAT_OPR(CPU_TOPOLOGY,  cpu_topology,   true),
2584         FEAT_OPR(NUMA_TOPOLOGY, numa_topology,  true),
2585         FEAT_OPN(BRANCH_STACK,  branch_stack,   false),
2586         FEAT_OPR(PMU_MAPPINGS,  pmu_mappings,   false),
2587         FEAT_OPR(GROUP_DESC,    group_desc,     false),
2588         FEAT_OPN(AUXTRACE,      auxtrace,       false),
2589         FEAT_OPN(STAT,          stat,           false),
2590         FEAT_OPN(CACHE,         cache,          true),
2591         FEAT_OPR(SAMPLE_TIME,   sample_time,    false),
2592         FEAT_OPR(MEM_TOPOLOGY,  mem_topology,   true),
2593 };
2594
2595 struct header_print_data {
2596         FILE *fp;
2597         bool full; /* extended list of headers */
2598 };
2599
2600 static int perf_file_section__fprintf_info(struct perf_file_section *section,
2601                                            struct perf_header *ph,
2602                                            int feat, int fd, void *data)
2603 {
2604         struct header_print_data *hd = data;
2605         struct feat_fd ff;
2606
2607         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2608                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2609                                 "%d, continuing...\n", section->offset, feat);
2610                 return 0;
2611         }
2612         if (feat >= HEADER_LAST_FEATURE) {
2613                 pr_warning("unknown feature %d\n", feat);
2614                 return 0;
2615         }
2616         if (!feat_ops[feat].print)
2617                 return 0;
2618
2619         ff = (struct  feat_fd) {
2620                 .fd = fd,
2621                 .ph = ph,
2622         };
2623
2624         if (!feat_ops[feat].full_only || hd->full)
2625                 feat_ops[feat].print(&ff, hd->fp);
2626         else
2627                 fprintf(hd->fp, "# %s info available, use -I to display\n",
2628                         feat_ops[feat].name);
2629
2630         return 0;
2631 }
2632
2633 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2634 {
2635         struct header_print_data hd;
2636         struct perf_header *header = &session->header;
2637         int fd = perf_data__fd(session->data);
2638         struct stat st;
2639         int ret, bit;
2640
2641         hd.fp = fp;
2642         hd.full = full;
2643
2644         ret = fstat(fd, &st);
2645         if (ret == -1)
2646                 return -1;
2647
2648         fprintf(fp, "# captured on    : %s", ctime(&st.st_ctime));
2649
2650         fprintf(fp, "# header version : %u\n", header->version);
2651         fprintf(fp, "# data offset    : %" PRIu64 "\n", header->data_offset);
2652         fprintf(fp, "# data size      : %" PRIu64 "\n", header->data_size);
2653         fprintf(fp, "# feat offset    : %" PRIu64 "\n", header->feat_offset);
2654
2655         perf_header__process_sections(header, fd, &hd,
2656                                       perf_file_section__fprintf_info);
2657
2658         if (session->data->is_pipe)
2659                 return 0;
2660
2661         fprintf(fp, "# missing features: ");
2662         for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {
2663                 if (bit)
2664                         fprintf(fp, "%s ", feat_ops[bit].name);
2665         }
2666
2667         fprintf(fp, "\n");
2668         return 0;
2669 }
2670
2671 static int do_write_feat(struct feat_fd *ff, int type,
2672                          struct perf_file_section **p,
2673                          struct perf_evlist *evlist)
2674 {
2675         int err;
2676         int ret = 0;
2677
2678         if (perf_header__has_feat(ff->ph, type)) {
2679                 if (!feat_ops[type].write)
2680                         return -1;
2681
2682                 if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
2683                         return -1;
2684
2685                 (*p)->offset = lseek(ff->fd, 0, SEEK_CUR);
2686
2687                 err = feat_ops[type].write(ff, evlist);
2688                 if (err < 0) {
2689                         pr_debug("failed to write feature %s\n", feat_ops[type].name);
2690
2691                         /* undo anything written */
2692                         lseek(ff->fd, (*p)->offset, SEEK_SET);
2693
2694                         return -1;
2695                 }
2696                 (*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;
2697                 (*p)++;
2698         }
2699         return ret;
2700 }
2701
2702 static int perf_header__adds_write(struct perf_header *header,
2703                                    struct perf_evlist *evlist, int fd)
2704 {
2705         int nr_sections;
2706         struct feat_fd ff;
2707         struct perf_file_section *feat_sec, *p;
2708         int sec_size;
2709         u64 sec_start;
2710         int feat;
2711         int err;
2712
2713         ff = (struct feat_fd){
2714                 .fd  = fd,
2715                 .ph = header,
2716         };
2717
2718         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2719         if (!nr_sections)
2720                 return 0;
2721
2722         feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2723         if (feat_sec == NULL)
2724                 return -ENOMEM;
2725
2726         sec_size = sizeof(*feat_sec) * nr_sections;
2727
2728         sec_start = header->feat_offset;
2729         lseek(fd, sec_start + sec_size, SEEK_SET);
2730
2731         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2732                 if (do_write_feat(&ff, feat, &p, evlist))
2733                         perf_header__clear_feat(header, feat);
2734         }
2735
2736         lseek(fd, sec_start, SEEK_SET);
2737         /*
2738          * may write more than needed due to dropped feature, but
2739          * this is okay, reader will skip the mising entries
2740          */
2741         err = do_write(&ff, feat_sec, sec_size);
2742         if (err < 0)
2743                 pr_debug("failed to write feature section\n");
2744         free(feat_sec);
2745         return err;
2746 }
2747
2748 int perf_header__write_pipe(int fd)
2749 {
2750         struct perf_pipe_file_header f_header;
2751         struct feat_fd ff;
2752         int err;
2753
2754         ff = (struct feat_fd){ .fd = fd };
2755
2756         f_header = (struct perf_pipe_file_header){
2757                 .magic     = PERF_MAGIC,
2758                 .size      = sizeof(f_header),
2759         };
2760
2761         err = do_write(&ff, &f_header, sizeof(f_header));
2762         if (err < 0) {
2763                 pr_debug("failed to write perf pipe header\n");
2764                 return err;
2765         }
2766
2767         return 0;
2768 }
2769
2770 int perf_session__write_header(struct perf_session *session,
2771                                struct perf_evlist *evlist,
2772                                int fd, bool at_exit)
2773 {
2774         struct perf_file_header f_header;
2775         struct perf_file_attr   f_attr;
2776         struct perf_header *header = &session->header;
2777         struct perf_evsel *evsel;
2778         struct feat_fd ff;
2779         u64 attr_offset;
2780         int err;
2781
2782         ff = (struct feat_fd){ .fd = fd};
2783         lseek(fd, sizeof(f_header), SEEK_SET);
2784
2785         evlist__for_each_entry(session->evlist, evsel) {
2786                 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2787                 err = do_write(&ff, evsel->id, evsel->ids * sizeof(u64));
2788                 if (err < 0) {
2789                         pr_debug("failed to write perf header\n");
2790                         return err;
2791                 }
2792         }
2793
2794         attr_offset = lseek(ff.fd, 0, SEEK_CUR);
2795
2796         evlist__for_each_entry(evlist, evsel) {
2797                 f_attr = (struct perf_file_attr){
2798                         .attr = evsel->attr,
2799                         .ids  = {
2800                                 .offset = evsel->id_offset,
2801                                 .size   = evsel->ids * sizeof(u64),
2802                         }
2803                 };
2804                 err = do_write(&ff, &f_attr, sizeof(f_attr));
2805                 if (err < 0) {
2806                         pr_debug("failed to write perf header attribute\n");
2807                         return err;
2808                 }
2809         }
2810
2811         if (!header->data_offset)
2812                 header->data_offset = lseek(fd, 0, SEEK_CUR);
2813         header->feat_offset = header->data_offset + header->data_size;
2814
2815         if (at_exit) {
2816                 err = perf_header__adds_write(header, evlist, fd);
2817                 if (err < 0)
2818                         return err;
2819         }
2820
2821         f_header = (struct perf_file_header){
2822                 .magic     = PERF_MAGIC,
2823                 .size      = sizeof(f_header),
2824                 .attr_size = sizeof(f_attr),
2825                 .attrs = {
2826                         .offset = attr_offset,
2827                         .size   = evlist->nr_entries * sizeof(f_attr),
2828                 },
2829                 .data = {
2830                         .offset = header->data_offset,
2831                         .size   = header->data_size,
2832                 },
2833                 /* event_types is ignored, store zeros */
2834         };
2835
2836         memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2837
2838         lseek(fd, 0, SEEK_SET);
2839         err = do_write(&ff, &f_header, sizeof(f_header));
2840         if (err < 0) {
2841                 pr_debug("failed to write perf header\n");
2842                 return err;
2843         }
2844         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2845
2846         return 0;
2847 }
2848
2849 static int perf_header__getbuffer64(struct perf_header *header,
2850                                     int fd, void *buf, size_t size)
2851 {
2852         if (readn(fd, buf, size) <= 0)
2853                 return -1;
2854
2855         if (header->needs_swap)
2856                 mem_bswap_64(buf, size);
2857
2858         return 0;
2859 }
2860
2861 int perf_header__process_sections(struct perf_header *header, int fd,
2862                                   void *data,
2863                                   int (*process)(struct perf_file_section *section,
2864                                                  struct perf_header *ph,
2865                                                  int feat, int fd, void *data))
2866 {
2867         struct perf_file_section *feat_sec, *sec;
2868         int nr_sections;
2869         int sec_size;
2870         int feat;
2871         int err;
2872
2873         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2874         if (!nr_sections)
2875                 return 0;
2876
2877         feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2878         if (!feat_sec)
2879                 return -1;
2880
2881         sec_size = sizeof(*feat_sec) * nr_sections;
2882
2883         lseek(fd, header->feat_offset, SEEK_SET);
2884
2885         err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2886         if (err < 0)
2887                 goto out_free;
2888
2889         for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2890                 err = process(sec++, header, feat, fd, data);
2891                 if (err < 0)
2892                         goto out_free;
2893         }
2894         err = 0;
2895 out_free:
2896         free(feat_sec);
2897         return err;
2898 }
2899
2900 static const int attr_file_abi_sizes[] = {
2901         [0] = PERF_ATTR_SIZE_VER0,
2902         [1] = PERF_ATTR_SIZE_VER1,
2903         [2] = PERF_ATTR_SIZE_VER2,
2904         [3] = PERF_ATTR_SIZE_VER3,
2905         [4] = PERF_ATTR_SIZE_VER4,
2906         0,
2907 };
2908
2909 /*
2910  * In the legacy file format, the magic number is not used to encode endianness.
2911  * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2912  * on ABI revisions, we need to try all combinations for all endianness to
2913  * detect the endianness.
2914  */
2915 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2916 {
2917         uint64_t ref_size, attr_size;
2918         int i;
2919
2920         for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2921                 ref_size = attr_file_abi_sizes[i]
2922                          + sizeof(struct perf_file_section);
2923                 if (hdr_sz != ref_size) {
2924                         attr_size = bswap_64(hdr_sz);
2925                         if (attr_size != ref_size)
2926                                 continue;
2927
2928                         ph->needs_swap = true;
2929                 }
2930                 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2931                          i,
2932                          ph->needs_swap);
2933                 return 0;
2934         }
2935         /* could not determine endianness */
2936         return -1;
2937 }
2938
2939 #define PERF_PIPE_HDR_VER0      16
2940
2941 static const size_t attr_pipe_abi_sizes[] = {
2942         [0] = PERF_PIPE_HDR_VER0,
2943         0,
2944 };
2945
2946 /*
2947  * In the legacy pipe format, there is an implicit assumption that endiannesss
2948  * between host recording the samples, and host parsing the samples is the
2949  * same. This is not always the case given that the pipe output may always be
2950  * redirected into a file and analyzed on a different machine with possibly a
2951  * different endianness and perf_event ABI revsions in the perf tool itself.
2952  */
2953 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2954 {
2955         u64 attr_size;
2956         int i;
2957
2958         for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2959                 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2960                         attr_size = bswap_64(hdr_sz);
2961                         if (attr_size != hdr_sz)
2962                                 continue;
2963
2964                         ph->needs_swap = true;
2965                 }
2966                 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2967                 return 0;
2968         }
2969         return -1;
2970 }
2971
2972 bool is_perf_magic(u64 magic)
2973 {
2974         if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2975                 || magic == __perf_magic2
2976                 || magic == __perf_magic2_sw)
2977                 return true;
2978
2979         return false;
2980 }
2981
2982 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2983                               bool is_pipe, struct perf_header *ph)
2984 {
2985         int ret;
2986
2987         /* check for legacy format */
2988         ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2989         if (ret == 0) {
2990                 ph->version = PERF_HEADER_VERSION_1;
2991                 pr_debug("legacy perf.data format\n");
2992                 if (is_pipe)
2993                         return try_all_pipe_abis(hdr_sz, ph);
2994
2995                 return try_all_file_abis(hdr_sz, ph);
2996         }
2997         /*
2998          * the new magic number serves two purposes:
2999          * - unique number to identify actual perf.data files
3000          * - encode endianness of file
3001          */
3002         ph->version = PERF_HEADER_VERSION_2;
3003
3004         /* check magic number with one endianness */
3005         if (magic == __perf_magic2)
3006                 return 0;
3007
3008         /* check magic number with opposite endianness */
3009         if (magic != __perf_magic2_sw)
3010                 return -1;
3011
3012         ph->needs_swap = true;
3013
3014         return 0;
3015 }
3016
3017 int perf_file_header__read(struct perf_file_header *header,
3018                            struct perf_header *ph, int fd)
3019 {
3020         ssize_t ret;
3021
3022         lseek(fd, 0, SEEK_SET);
3023
3024         ret = readn(fd, header, sizeof(*header));
3025         if (ret <= 0)
3026                 return -1;
3027
3028         if (check_magic_endian(header->magic,
3029                                header->attr_size, false, ph) < 0) {
3030                 pr_debug("magic/endian check failed\n");
3031                 return -1;
3032         }
3033
3034         if (ph->needs_swap) {
3035                 mem_bswap_64(header, offsetof(struct perf_file_header,
3036                              adds_features));
3037         }
3038
3039         if (header->size != sizeof(*header)) {
3040                 /* Support the previous format */
3041                 if (header->size == offsetof(typeof(*header), adds_features))
3042                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
3043                 else
3044                         return -1;
3045         } else if (ph->needs_swap) {
3046                 /*
3047                  * feature bitmap is declared as an array of unsigned longs --
3048                  * not good since its size can differ between the host that
3049                  * generated the data file and the host analyzing the file.
3050                  *
3051                  * We need to handle endianness, but we don't know the size of
3052                  * the unsigned long where the file was generated. Take a best
3053                  * guess at determining it: try 64-bit swap first (ie., file
3054                  * created on a 64-bit host), and check if the hostname feature
3055                  * bit is set (this feature bit is forced on as of fbe96f2).
3056                  * If the bit is not, undo the 64-bit swap and try a 32-bit
3057                  * swap. If the hostname bit is still not set (e.g., older data
3058                  * file), punt and fallback to the original behavior --
3059                  * clearing all feature bits and setting buildid.
3060                  */
3061                 mem_bswap_64(&header->adds_features,
3062                             BITS_TO_U64(HEADER_FEAT_BITS));
3063
3064                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
3065                         /* unswap as u64 */
3066                         mem_bswap_64(&header->adds_features,
3067                                     BITS_TO_U64(HEADER_FEAT_BITS));
3068
3069                         /* unswap as u32 */
3070                         mem_bswap_32(&header->adds_features,
3071                                     BITS_TO_U32(HEADER_FEAT_BITS));
3072                 }
3073
3074                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
3075                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
3076                         set_bit(HEADER_BUILD_ID, header->adds_features);
3077                 }
3078         }
3079
3080         memcpy(&ph->adds_features, &header->adds_features,
3081                sizeof(ph->adds_features));
3082
3083         ph->data_offset  = header->data.offset;
3084         ph->data_size    = header->data.size;
3085         ph->feat_offset  = header->data.offset + header->data.size;
3086         return 0;
3087 }
3088
3089 static int perf_file_section__process(struct perf_file_section *section,
3090                                       struct perf_header *ph,
3091                                       int feat, int fd, void *data)
3092 {
3093         struct feat_fd fdd = {
3094                 .fd     = fd,
3095                 .ph     = ph,
3096                 .size   = section->size,
3097                 .offset = section->offset,
3098         };
3099
3100         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
3101                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
3102                           "%d, continuing...\n", section->offset, feat);
3103                 return 0;
3104         }
3105
3106         if (feat >= HEADER_LAST_FEATURE) {
3107                 pr_debug("unknown feature %d, continuing...\n", feat);
3108                 return 0;
3109         }
3110
3111         if (!feat_ops[feat].process)
3112                 return 0;
3113
3114         return feat_ops[feat].process(&fdd, data);
3115 }
3116
3117 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
3118                                        struct perf_header *ph, int fd,
3119                                        bool repipe)
3120 {
3121         struct feat_fd ff = {
3122                 .fd = STDOUT_FILENO,
3123                 .ph = ph,
3124         };
3125         ssize_t ret;
3126
3127         ret = readn(fd, header, sizeof(*header));
3128         if (ret <= 0)
3129                 return -1;
3130
3131         if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
3132                 pr_debug("endian/magic failed\n");
3133                 return -1;
3134         }
3135
3136         if (ph->needs_swap)
3137                 header->size = bswap_64(header->size);
3138
3139         if (repipe && do_write(&ff, header, sizeof(*header)) < 0)
3140                 return -1;
3141
3142         return 0;
3143 }
3144
3145 static int perf_header__read_pipe(struct perf_session *session)
3146 {
3147         struct perf_header *header = &session->header;
3148         struct perf_pipe_file_header f_header;
3149
3150         if (perf_file_header__read_pipe(&f_header, header,
3151                                         perf_data__fd(session->data),
3152                                         session->repipe) < 0) {
3153                 pr_debug("incompatible file format\n");
3154                 return -EINVAL;
3155         }
3156
3157         return 0;
3158 }
3159
3160 static int read_attr(int fd, struct perf_header *ph,
3161                      struct perf_file_attr *f_attr)
3162 {
3163         struct perf_event_attr *attr = &f_attr->attr;
3164         size_t sz, left;
3165         size_t our_sz = sizeof(f_attr->attr);
3166         ssize_t ret;
3167
3168         memset(f_attr, 0, sizeof(*f_attr));
3169
3170         /* read minimal guaranteed structure */
3171         ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
3172         if (ret <= 0) {
3173                 pr_debug("cannot read %d bytes of header attr\n",
3174                          PERF_ATTR_SIZE_VER0);
3175                 return -1;
3176         }
3177
3178         /* on file perf_event_attr size */
3179         sz = attr->size;
3180
3181         if (ph->needs_swap)
3182                 sz = bswap_32(sz);
3183
3184         if (sz == 0) {
3185                 /* assume ABI0 */
3186                 sz =  PERF_ATTR_SIZE_VER0;
3187         } else if (sz > our_sz) {
3188                 pr_debug("file uses a more recent and unsupported ABI"
3189                          " (%zu bytes extra)\n", sz - our_sz);
3190                 return -1;
3191         }
3192         /* what we have not yet read and that we know about */
3193         left = sz - PERF_ATTR_SIZE_VER0;
3194         if (left) {
3195                 void *ptr = attr;
3196                 ptr += PERF_ATTR_SIZE_VER0;
3197
3198                 ret = readn(fd, ptr, left);
3199         }
3200         /* read perf_file_section, ids are read in caller */
3201         ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
3202
3203         return ret <= 0 ? -1 : 0;
3204 }
3205
3206 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
3207                                                 struct tep_handle *pevent)
3208 {
3209         struct event_format *event;
3210         char bf[128];
3211
3212         /* already prepared */
3213         if (evsel->tp_format)
3214                 return 0;
3215
3216         if (pevent == NULL) {
3217                 pr_debug("broken or missing trace data\n");
3218                 return -1;
3219         }
3220
3221         event = tep_find_event(pevent, evsel->attr.config);
3222         if (event == NULL) {
3223                 pr_debug("cannot find event format for %d\n", (int)evsel->attr.config);
3224                 return -1;
3225         }
3226
3227         if (!evsel->name) {
3228                 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
3229                 evsel->name = strdup(bf);
3230                 if (evsel->name == NULL)
3231                         return -1;
3232         }
3233
3234         evsel->tp_format = event;
3235         return 0;
3236 }
3237
3238 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
3239                                                   struct tep_handle *pevent)
3240 {
3241         struct perf_evsel *pos;
3242
3243         evlist__for_each_entry(evlist, pos) {
3244                 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
3245                     perf_evsel__prepare_tracepoint_event(pos, pevent))
3246                         return -1;
3247         }
3248
3249         return 0;
3250 }
3251
3252 int perf_session__read_header(struct perf_session *session)
3253 {
3254         struct perf_data *data = session->data;
3255         struct perf_header *header = &session->header;
3256         struct perf_file_header f_header;
3257         struct perf_file_attr   f_attr;
3258         u64                     f_id;
3259         int nr_attrs, nr_ids, i, j;
3260         int fd = perf_data__fd(data);
3261
3262         session->evlist = perf_evlist__new();
3263         if (session->evlist == NULL)
3264                 return -ENOMEM;
3265
3266         session->evlist->env = &header->env;
3267         session->machines.host.env = &header->env;
3268         if (perf_data__is_pipe(data))
3269                 return perf_header__read_pipe(session);
3270
3271         if (perf_file_header__read(&f_header, header, fd) < 0)
3272                 return -EINVAL;
3273
3274         /*
3275          * Sanity check that perf.data was written cleanly; data size is
3276          * initialized to 0 and updated only if the on_exit function is run.
3277          * If data size is still 0 then the file contains only partial
3278          * information.  Just warn user and process it as much as it can.
3279          */
3280         if (f_header.data.size == 0) {
3281                 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
3282                            "Was the 'perf record' command properly terminated?\n",
3283                            data->file.path);
3284         }
3285
3286         nr_attrs = f_header.attrs.size / f_header.attr_size;
3287         lseek(fd, f_header.attrs.offset, SEEK_SET);
3288
3289         for (i = 0; i < nr_attrs; i++) {
3290                 struct perf_evsel *evsel;
3291                 off_t tmp;
3292
3293                 if (read_attr(fd, header, &f_attr) < 0)
3294                         goto out_errno;
3295
3296                 if (header->needs_swap) {
3297                         f_attr.ids.size   = bswap_64(f_attr.ids.size);
3298                         f_attr.ids.offset = bswap_64(f_attr.ids.offset);
3299                         perf_event__attr_swap(&f_attr.attr);
3300                 }
3301
3302                 tmp = lseek(fd, 0, SEEK_CUR);
3303                 evsel = perf_evsel__new(&f_attr.attr);
3304
3305                 if (evsel == NULL)
3306                         goto out_delete_evlist;
3307
3308                 evsel->needs_swap = header->needs_swap;
3309                 /*
3310                  * Do it before so that if perf_evsel__alloc_id fails, this
3311                  * entry gets purged too at perf_evlist__delete().
3312                  */
3313                 perf_evlist__add(session->evlist, evsel);
3314
3315                 nr_ids = f_attr.ids.size / sizeof(u64);
3316                 /*
3317                  * We don't have the cpu and thread maps on the header, so
3318                  * for allocating the perf_sample_id table we fake 1 cpu and
3319                  * hattr->ids threads.
3320                  */
3321                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
3322                         goto out_delete_evlist;
3323
3324                 lseek(fd, f_attr.ids.offset, SEEK_SET);
3325
3326                 for (j = 0; j < nr_ids; j++) {
3327                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
3328                                 goto out_errno;
3329
3330                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
3331                 }
3332
3333                 lseek(fd, tmp, SEEK_SET);
3334         }
3335
3336         perf_header__process_sections(header, fd, &session->tevent,
3337                                       perf_file_section__process);
3338
3339         if (perf_evlist__prepare_tracepoint_events(session->evlist,
3340                                                    session->tevent.pevent))
3341                 goto out_delete_evlist;
3342
3343         return 0;
3344 out_errno:
3345         return -errno;
3346
3347 out_delete_evlist:
3348         perf_evlist__delete(session->evlist);
3349         session->evlist = NULL;
3350         return -ENOMEM;
3351 }
3352
3353 int perf_event__synthesize_attr(struct perf_tool *tool,
3354                                 struct perf_event_attr *attr, u32 ids, u64 *id,
3355                                 perf_event__handler_t process)
3356 {
3357         union perf_event *ev;
3358         size_t size;
3359         int err;
3360
3361         size = sizeof(struct perf_event_attr);
3362         size = PERF_ALIGN(size, sizeof(u64));
3363         size += sizeof(struct perf_event_header);
3364         size += ids * sizeof(u64);
3365
3366         ev = malloc(size);
3367
3368         if (ev == NULL)
3369                 return -ENOMEM;
3370
3371         ev->attr.attr = *attr;
3372         memcpy(ev->attr.id, id, ids * sizeof(u64));
3373
3374         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
3375         ev->attr.header.size = (u16)size;
3376
3377         if (ev->attr.header.size == size)
3378                 err = process(tool, ev, NULL, NULL);
3379         else
3380                 err = -E2BIG;
3381
3382         free(ev);
3383
3384         return err;
3385 }
3386
3387 int perf_event__synthesize_features(struct perf_tool *tool,
3388                                     struct perf_session *session,
3389                                     struct perf_evlist *evlist,
3390                                     perf_event__handler_t process)
3391 {
3392         struct perf_header *header = &session->header;
3393         struct feat_fd ff;
3394         struct feature_event *fe;
3395         size_t sz, sz_hdr;
3396         int feat, ret;
3397
3398         sz_hdr = sizeof(fe->header);
3399         sz = sizeof(union perf_event);
3400         /* get a nice alignment */
3401         sz = PERF_ALIGN(sz, page_size);
3402
3403         memset(&ff, 0, sizeof(ff));
3404
3405         ff.buf = malloc(sz);
3406         if (!ff.buf)
3407                 return -ENOMEM;
3408
3409         ff.size = sz - sz_hdr;
3410
3411         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
3412                 if (!feat_ops[feat].synthesize) {
3413                         pr_debug("No record header feature for header :%d\n", feat);
3414                         continue;
3415                 }
3416
3417                 ff.offset = sizeof(*fe);
3418
3419                 ret = feat_ops[feat].write(&ff, evlist);
3420                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
3421                         pr_debug("Error writing feature\n");
3422                         continue;
3423                 }
3424                 /* ff.buf may have changed due to realloc in do_write() */
3425                 fe = ff.buf;
3426                 memset(fe, 0, sizeof(*fe));
3427
3428                 fe->feat_id = feat;
3429                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
3430                 fe->header.size = ff.offset;
3431
3432                 ret = process(tool, ff.buf, NULL, NULL);
3433                 if (ret) {
3434                         free(ff.buf);
3435                         return ret;
3436                 }
3437         }
3438
3439         /* Send HEADER_LAST_FEATURE mark. */
3440         fe = ff.buf;
3441         fe->feat_id     = HEADER_LAST_FEATURE;
3442         fe->header.type = PERF_RECORD_HEADER_FEATURE;
3443         fe->header.size = sizeof(*fe);
3444
3445         ret = process(tool, ff.buf, NULL, NULL);
3446
3447         free(ff.buf);
3448         return ret;
3449 }
3450
3451 int perf_event__process_feature(struct perf_tool *tool,
3452                                 union perf_event *event,
3453                                 struct perf_session *session __maybe_unused)
3454 {
3455         struct feat_fd ff = { .fd = 0 };
3456         struct feature_event *fe = (struct feature_event *)event;
3457         int type = fe->header.type;
3458         u64 feat = fe->feat_id;
3459
3460         if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {
3461                 pr_warning("invalid record type %d in pipe-mode\n", type);
3462                 return 0;
3463         }
3464         if (feat == HEADER_RESERVED || feat >= HEADER_LAST_FEATURE) {
3465                 pr_warning("invalid record type %d in pipe-mode\n", type);
3466                 return -1;
3467         }
3468
3469         if (!feat_ops[feat].process)
3470                 return 0;
3471
3472         ff.buf  = (void *)fe->data;
3473         ff.size = event->header.size - sizeof(event->header);
3474         ff.ph = &session->header;
3475
3476         if (feat_ops[feat].process(&ff, NULL))
3477                 return -1;
3478
3479         if (!feat_ops[feat].print || !tool->show_feat_hdr)
3480                 return 0;
3481
3482         if (!feat_ops[feat].full_only ||
3483             tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {
3484                 feat_ops[feat].print(&ff, stdout);
3485         } else {
3486                 fprintf(stdout, "# %s info available, use -I to display\n",
3487                         feat_ops[feat].name);
3488         }
3489
3490         return 0;
3491 }
3492
3493 static struct event_update_event *
3494 event_update_event__new(size_t size, u64 type, u64 id)
3495 {
3496         struct event_update_event *ev;
3497
3498         size += sizeof(*ev);
3499         size  = PERF_ALIGN(size, sizeof(u64));
3500
3501         ev = zalloc(size);
3502         if (ev) {
3503                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
3504                 ev->header.size = (u16)size;
3505                 ev->type = type;
3506                 ev->id = id;
3507         }
3508         return ev;
3509 }
3510
3511 int
3512 perf_event__synthesize_event_update_unit(struct perf_tool *tool,
3513                                          struct perf_evsel *evsel,
3514                                          perf_event__handler_t process)
3515 {
3516         struct event_update_event *ev;
3517         size_t size = strlen(evsel->unit);
3518         int err;
3519
3520         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
3521         if (ev == NULL)
3522                 return -ENOMEM;
3523
3524         strncpy(ev->data, evsel->unit, size);
3525         err = process(tool, (union perf_event *)ev, NULL, NULL);
3526         free(ev);
3527         return err;
3528 }
3529
3530 int
3531 perf_event__synthesize_event_update_scale(struct perf_tool *tool,
3532                                           struct perf_evsel *evsel,
3533                                           perf_event__handler_t process)
3534 {
3535         struct event_update_event *ev;
3536         struct event_update_event_scale *ev_data;
3537         int err;
3538
3539         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->id[0]);
3540         if (ev == NULL)
3541                 return -ENOMEM;
3542
3543         ev_data = (struct event_update_event_scale *) ev->data;
3544         ev_data->scale = evsel->scale;
3545         err = process(tool, (union perf_event*) ev, NULL, NULL);
3546         free(ev);
3547         return err;
3548 }
3549
3550 int
3551 perf_event__synthesize_event_update_name(struct perf_tool *tool,
3552                                          struct perf_evsel *evsel,
3553                                          perf_event__handler_t process)
3554 {
3555         struct event_update_event *ev;
3556         size_t len = strlen(evsel->name);
3557         int err;
3558
3559         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->id[0]);
3560         if (ev == NULL)
3561                 return -ENOMEM;
3562
3563         strncpy(ev->data, evsel->name, len);
3564         err = process(tool, (union perf_event*) ev, NULL, NULL);
3565         free(ev);
3566         return err;
3567 }
3568
3569 int
3570 perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
3571                                         struct perf_evsel *evsel,
3572                                         perf_event__handler_t process)
3573 {
3574         size_t size = sizeof(struct event_update_event);
3575         struct event_update_event *ev;
3576         int max, err;
3577         u16 type;
3578
3579         if (!evsel->own_cpus)
3580                 return 0;
3581
3582         ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
3583         if (!ev)
3584                 return -ENOMEM;
3585
3586         ev->header.type = PERF_RECORD_EVENT_UPDATE;
3587         ev->header.size = (u16)size;
3588         ev->type = PERF_EVENT_UPDATE__CPUS;
3589         ev->id   = evsel->id[0];
3590
3591         cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
3592                                  evsel->own_cpus,
3593                                  type, max);
3594
3595         err = process(tool, (union perf_event*) ev, NULL, NULL);
3596         free(ev);
3597         return err;
3598 }
3599
3600 size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
3601 {
3602         struct event_update_event *ev = &event->event_update;
3603         struct event_update_event_scale *ev_scale;
3604         struct event_update_event_cpus *ev_cpus;
3605         struct cpu_map *map;
3606         size_t ret;
3607
3608         ret = fprintf(fp, "\n... id:    %" PRIu64 "\n", ev->id);
3609
3610         switch (ev->type) {
3611         case PERF_EVENT_UPDATE__SCALE:
3612                 ev_scale = (struct event_update_event_scale *) ev->data;
3613                 ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
3614                 break;
3615         case PERF_EVENT_UPDATE__UNIT:
3616                 ret += fprintf(fp, "... unit:  %s\n", ev->data);
3617                 break;
3618         case PERF_EVENT_UPDATE__NAME:
3619                 ret += fprintf(fp, "... name:  %s\n", ev->data);
3620                 break;
3621         case PERF_EVENT_UPDATE__CPUS:
3622                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3623                 ret += fprintf(fp, "... ");
3624
3625                 map = cpu_map__new_data(&ev_cpus->cpus);
3626                 if (map)
3627                         ret += cpu_map__fprintf(map, fp);
3628                 else
3629                         ret += fprintf(fp, "failed to get cpus\n");
3630                 break;
3631         default:
3632                 ret += fprintf(fp, "... unknown type\n");
3633                 break;
3634         }
3635
3636         return ret;
3637 }
3638
3639 int perf_event__synthesize_attrs(struct perf_tool *tool,
3640                                    struct perf_session *session,
3641                                    perf_event__handler_t process)
3642 {
3643         struct perf_evsel *evsel;
3644         int err = 0;
3645
3646         evlist__for_each_entry(session->evlist, evsel) {
3647                 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
3648                                                   evsel->id, process);
3649                 if (err) {
3650                         pr_debug("failed to create perf header attribute\n");
3651                         return err;
3652                 }
3653         }
3654
3655         return err;
3656 }
3657
3658 static bool has_unit(struct perf_evsel *counter)
3659 {
3660         return counter->unit && *counter->unit;
3661 }
3662
3663 static bool has_scale(struct perf_evsel *counter)
3664 {
3665         return counter->scale != 1;
3666 }
3667
3668 int perf_event__synthesize_extra_attr(struct perf_tool *tool,
3669                                       struct perf_evlist *evsel_list,
3670                                       perf_event__handler_t process,
3671                                       bool is_pipe)
3672 {
3673         struct perf_evsel *counter;
3674         int err;
3675
3676         /*
3677          * Synthesize other events stuff not carried within
3678          * attr event - unit, scale, name
3679          */
3680         evlist__for_each_entry(evsel_list, counter) {
3681                 if (!counter->supported)
3682                         continue;
3683
3684                 /*
3685                  * Synthesize unit and scale only if it's defined.
3686                  */
3687                 if (has_unit(counter)) {
3688                         err = perf_event__synthesize_event_update_unit(tool, counter, process);
3689                         if (err < 0) {
3690                                 pr_err("Couldn't synthesize evsel unit.\n");
3691                                 return err;
3692                         }
3693                 }
3694
3695                 if (has_scale(counter)) {
3696                         err = perf_event__synthesize_event_update_scale(tool, counter, process);
3697                         if (err < 0) {
3698                                 pr_err("Couldn't synthesize evsel counter.\n");
3699                                 return err;
3700                         }
3701                 }
3702
3703                 if (counter->own_cpus) {
3704                         err = perf_event__synthesize_event_update_cpus(tool, counter, process);
3705                         if (err < 0) {
3706                                 pr_err("Couldn't synthesize evsel cpus.\n");
3707                                 return err;
3708                         }
3709                 }
3710
3711                 /*
3712                  * Name is needed only for pipe output,
3713                  * perf.data carries event names.
3714                  */
3715                 if (is_pipe) {
3716                         err = perf_event__synthesize_event_update_name(tool, counter, process);
3717                         if (err < 0) {
3718                                 pr_err("Couldn't synthesize evsel name.\n");
3719                                 return err;
3720                         }
3721                 }
3722         }
3723         return 0;
3724 }
3725
3726 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
3727                              union perf_event *event,
3728                              struct perf_evlist **pevlist)
3729 {
3730         u32 i, ids, n_ids;
3731         struct perf_evsel *evsel;
3732         struct perf_evlist *evlist = *pevlist;
3733
3734         if (evlist == NULL) {
3735                 *pevlist = evlist = perf_evlist__new();
3736                 if (evlist == NULL)
3737                         return -ENOMEM;
3738         }
3739
3740         evsel = perf_evsel__new(&event->attr.attr);
3741         if (evsel == NULL)
3742                 return -ENOMEM;
3743
3744         perf_evlist__add(evlist, evsel);
3745
3746         ids = event->header.size;
3747         ids -= (void *)&event->attr.id - (void *)event;
3748         n_ids = ids / sizeof(u64);
3749         /*
3750          * We don't have the cpu and thread maps on the header, so
3751          * for allocating the perf_sample_id table we fake 1 cpu and
3752          * hattr->ids threads.
3753          */
3754         if (perf_evsel__alloc_id(evsel, 1, n_ids))
3755                 return -ENOMEM;
3756
3757         for (i = 0; i < n_ids; i++) {
3758                 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3759         }
3760
3761         return 0;
3762 }
3763
3764 int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
3765                                      union perf_event *event,
3766                                      struct perf_evlist **pevlist)
3767 {
3768         struct event_update_event *ev = &event->event_update;
3769         struct event_update_event_scale *ev_scale;
3770         struct event_update_event_cpus *ev_cpus;
3771         struct perf_evlist *evlist;
3772         struct perf_evsel *evsel;
3773         struct cpu_map *map;
3774
3775         if (!pevlist || *pevlist == NULL)
3776                 return -EINVAL;
3777
3778         evlist = *pevlist;
3779
3780         evsel = perf_evlist__id2evsel(evlist, ev->id);
3781         if (evsel == NULL)
3782                 return -EINVAL;
3783
3784         switch (ev->type) {
3785         case PERF_EVENT_UPDATE__UNIT:
3786                 evsel->unit = strdup(ev->data);
3787                 break;
3788         case PERF_EVENT_UPDATE__NAME:
3789                 evsel->name = strdup(ev->data);
3790                 break;
3791         case PERF_EVENT_UPDATE__SCALE:
3792                 ev_scale = (struct event_update_event_scale *) ev->data;
3793                 evsel->scale = ev_scale->scale;
3794                 break;
3795         case PERF_EVENT_UPDATE__CPUS:
3796                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3797
3798                 map = cpu_map__new_data(&ev_cpus->cpus);
3799                 if (map)
3800                         evsel->own_cpus = map;
3801                 else
3802                         pr_err("failed to get event_update cpus\n");
3803         default:
3804                 break;
3805         }
3806
3807         return 0;
3808 }
3809
3810 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3811                                         struct perf_evlist *evlist,
3812                                         perf_event__handler_t process)
3813 {
3814         union perf_event ev;
3815         struct tracing_data *tdata;
3816         ssize_t size = 0, aligned_size = 0, padding;
3817         struct feat_fd ff;
3818         int err __maybe_unused = 0;
3819
3820         /*
3821          * We are going to store the size of the data followed
3822          * by the data contents. Since the fd descriptor is a pipe,
3823          * we cannot seek back to store the size of the data once
3824          * we know it. Instead we:
3825          *
3826          * - write the tracing data to the temp file
3827          * - get/write the data size to pipe
3828          * - write the tracing data from the temp file
3829          *   to the pipe
3830          */
3831         tdata = tracing_data_get(&evlist->entries, fd, true);
3832         if (!tdata)
3833                 return -1;
3834
3835         memset(&ev, 0, sizeof(ev));
3836
3837         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3838         size = tdata->size;
3839         aligned_size = PERF_ALIGN(size, sizeof(u64));
3840         padding = aligned_size - size;
3841         ev.tracing_data.header.size = sizeof(ev.tracing_data);
3842         ev.tracing_data.size = aligned_size;
3843
3844         process(tool, &ev, NULL, NULL);
3845
3846         /*
3847          * The put function will copy all the tracing data
3848          * stored in temp file to the pipe.
3849          */
3850         tracing_data_put(tdata);
3851
3852         ff = (struct feat_fd){ .fd = fd };
3853         if (write_padded(&ff, NULL, 0, padding))
3854                 return -1;
3855
3856         return aligned_size;
3857 }
3858
3859 int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
3860                                      union perf_event *event,
3861                                      struct perf_session *session)
3862 {
3863         ssize_t size_read, padding, size = event->tracing_data.size;
3864         int fd = perf_data__fd(session->data);
3865         off_t offset = lseek(fd, 0, SEEK_CUR);
3866         char buf[BUFSIZ];
3867
3868         /* setup for reading amidst mmap */
3869         lseek(fd, offset + sizeof(struct tracing_data_event),
3870               SEEK_SET);
3871
3872         size_read = trace_report(fd, &session->tevent,
3873                                  session->repipe);
3874         padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3875
3876         if (readn(fd, buf, padding) < 0) {
3877                 pr_err("%s: reading input file", __func__);
3878                 return -1;
3879         }
3880         if (session->repipe) {
3881                 int retw = write(STDOUT_FILENO, buf, padding);
3882                 if (retw <= 0 || retw != padding) {
3883                         pr_err("%s: repiping tracing data padding", __func__);
3884                         return -1;
3885                 }
3886         }
3887
3888         if (size_read + padding != size) {
3889                 pr_err("%s: tracing data size mismatch", __func__);
3890                 return -1;
3891         }
3892
3893         perf_evlist__prepare_tracepoint_events(session->evlist,
3894                                                session->tevent.pevent);
3895
3896         return size_read + padding;
3897 }
3898
3899 int perf_event__synthesize_build_id(struct perf_tool *tool,
3900                                     struct dso *pos, u16 misc,
3901                                     perf_event__handler_t process,
3902                                     struct machine *machine)
3903 {
3904         union perf_event ev;
3905         size_t len;
3906         int err = 0;
3907
3908         if (!pos->hit)
3909                 return err;
3910
3911         memset(&ev, 0, sizeof(ev));
3912
3913         len = pos->long_name_len + 1;
3914         len = PERF_ALIGN(len, NAME_ALIGN);
3915         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3916         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3917         ev.build_id.header.misc = misc;
3918         ev.build_id.pid = machine->pid;
3919         ev.build_id.header.size = sizeof(ev.build_id) + len;
3920         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3921
3922         err = process(tool, &ev, NULL, machine);
3923
3924         return err;
3925 }
3926
3927 int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
3928                                  union perf_event *event,
3929                                  struct perf_session *session)
3930 {
3931         __event_process_build_id(&event->build_id,
3932                                  event->build_id.filename,
3933                                  session);
3934         return 0;
3935 }