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  * Return the CPU id as a raw string.
 992  *
 993  * Each architecture should provide a more precise id string that
 994  * can be use to match the architecture's "mapfile".
 995  */
 996 char * __weak get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
 997 {
 998         return NULL;
 999 }
1000
1001 /* Return zero when the cpuid from the mapfile.csv matches the
1002  * cpuid string generated on this platform.
1003  * Otherwise return non-zero.
1004  */
1005 int __weak strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)
1006 {
1007         regex_t re;
1008         regmatch_t pmatch[1];
1009         int match;
1010
1011         if (regcomp(&re, mapcpuid, REG_EXTENDED) != 0) {
1012                 /* Warn unable to generate match particular string. */
1013                 pr_info("Invalid regular expression %s\n", mapcpuid);
1014                 return 1;
1015         }
1016
1017         match = !regexec(&re, cpuid, 1, pmatch, 0);
1018         regfree(&re);
1019         if (match) {
1020                 size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);
1021
1022                 /* Verify the entire string matched. */
1023                 if (match_len == strlen(cpuid))
1024                         return 0;
1025         }
1026         return 1;
1027 }
1028
1029 /*
1030  * default get_cpuid(): nothing gets recorded
1031  * actual implementation must be in arch/$(SRCARCH)/util/header.c
1032  */
1033 int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)
1034 {
1035         return -1;
1036 }
1037
1038 static int write_cpuid(struct feat_fd *ff,
1039                        struct perf_evlist *evlist __maybe_unused)
1040 {
1041         char buffer[64];
1042         int ret;
1043
1044         ret = get_cpuid(buffer, sizeof(buffer));
1045         if (!ret)
1046                 goto write_it;
1047
1048         return -1;
1049 write_it:
1050         return do_write_string(ff, buffer);
1051 }
1052
1053 static int write_branch_stack(struct feat_fd *ff __maybe_unused,
1054                               struct perf_evlist *evlist __maybe_unused)
1055 {
1056         return 0;
1057 }
1058
1059 static int write_auxtrace(struct feat_fd *ff,
1060                           struct perf_evlist *evlist __maybe_unused)
1061 {
1062         struct perf_session *session;
1063         int err;
1064
1065         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
1066                 return -1;
1067
1068         session = container_of(ff->ph, struct perf_session, header);
1069
1070         err = auxtrace_index__write(ff->fd, &session->auxtrace_index);
1071         if (err < 0)
1072                 pr_err("Failed to write auxtrace index\n");
1073         return err;
1074 }
1075
1076 static int write_clockid(struct feat_fd *ff,
1077                          struct perf_evlist *evlist __maybe_unused)
1078 {
1079         return do_write(ff, &ff->ph->env.clockid_res_ns,
1080                         sizeof(ff->ph->env.clockid_res_ns));
1081 }
1082
1083 static int cpu_cache_level__sort(const void *a, const void *b)
1084 {
1085         struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
1086         struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
1087
1088         return cache_a->level - cache_b->level;
1089 }
1090
1091 static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
1092 {
1093         if (a->level != b->level)
1094                 return false;
1095
1096         if (a->line_size != b->line_size)
1097                 return false;
1098
1099         if (a->sets != b->sets)
1100                 return false;
1101
1102         if (a->ways != b->ways)
1103                 return false;
1104
1105         if (strcmp(a->type, b->type))
1106                 return false;
1107
1108         if (strcmp(a->size, b->size))
1109                 return false;
1110
1111         if (strcmp(a->map, b->map))
1112                 return false;
1113
1114         return true;
1115 }
1116
1117 static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
1118 {
1119         char path[PATH_MAX], file[PATH_MAX];
1120         struct stat st;
1121         size_t len;
1122
1123         scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
1124         scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
1125
1126         if (stat(file, &st))
1127                 return 1;
1128
1129         scnprintf(file, PATH_MAX, "%s/level", path);
1130         if (sysfs__read_int(file, (int *) &cache->level))
1131                 return -1;
1132
1133         scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
1134         if (sysfs__read_int(file, (int *) &cache->line_size))
1135                 return -1;
1136
1137         scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
1138         if (sysfs__read_int(file, (int *) &cache->sets))
1139                 return -1;
1140
1141         scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
1142         if (sysfs__read_int(file, (int *) &cache->ways))
1143                 return -1;
1144
1145         scnprintf(file, PATH_MAX, "%s/type", path);
1146         if (sysfs__read_str(file, &cache->type, &len))
1147                 return -1;
1148
1149         cache->type[len] = 0;
1150         cache->type = rtrim(cache->type);
1151
1152         scnprintf(file, PATH_MAX, "%s/size", path);
1153         if (sysfs__read_str(file, &cache->size, &len)) {
1154                 free(cache->type);
1155                 return -1;
1156         }
1157
1158         cache->size[len] = 0;
1159         cache->size = rtrim(cache->size);
1160
1161         scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
1162         if (sysfs__read_str(file, &cache->map, &len)) {
1163                 free(cache->map);
1164                 free(cache->type);
1165                 return -1;
1166         }
1167
1168         cache->map[len] = 0;
1169         cache->map = rtrim(cache->map);
1170         return 0;
1171 }
1172
1173 static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
1174 {
1175         fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
1176 }
1177
1178 static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
1179 {
1180         u32 i, cnt = 0;
1181         long ncpus;
1182         u32 nr, cpu;
1183         u16 level;
1184
1185         ncpus = sysconf(_SC_NPROCESSORS_CONF);
1186         if (ncpus < 0)
1187                 return -1;
1188
1189         nr = (u32)(ncpus & UINT_MAX);
1190
1191         for (cpu = 0; cpu < nr; cpu++) {
1192                 for (level = 0; level < 10; level++) {
1193                         struct cpu_cache_level c;
1194                         int err;
1195
1196                         err = cpu_cache_level__read(&c, cpu, level);
1197                         if (err < 0)
1198                                 return err;
1199
1200                         if (err == 1)
1201                                 break;
1202
1203                         for (i = 0; i < cnt; i++) {
1204                                 if (cpu_cache_level__cmp(&c, &caches[i]))
1205                                         break;
1206                         }
1207
1208                         if (i == cnt)
1209                                 caches[cnt++] = c;
1210                         else
1211                                 cpu_cache_level__free(&c);
1212
1213                         if (WARN_ONCE(cnt == size, "way too many cpu caches.."))
1214                                 goto out;
1215                 }
1216         }
1217  out:
1218         *cntp = cnt;
1219         return 0;
1220 }
1221
1222 #define MAX_CACHES 2000
1223
1224 static int write_cache(struct feat_fd *ff,
1225                        struct perf_evlist *evlist __maybe_unused)
1226 {
1227         struct cpu_cache_level caches[MAX_CACHES];
1228         u32 cnt = 0, i, version = 1;
1229         int ret;
1230
1231         ret = build_caches(caches, MAX_CACHES, &cnt);
1232         if (ret)
1233                 goto out;
1234
1235         qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1236
1237         ret = do_write(ff, &version, sizeof(u32));
1238         if (ret < 0)
1239                 goto out;
1240
1241         ret = do_write(ff, &cnt, sizeof(u32));
1242         if (ret < 0)
1243                 goto out;
1244
1245         for (i = 0; i < cnt; i++) {
1246                 struct cpu_cache_level *c = &caches[i];
1247
1248                 #define _W(v)                                   \
1249                         ret = do_write(ff, &c->v, sizeof(u32)); \
1250                         if (ret < 0)                            \
1251                                 goto out;
1252
1253                 _W(level)
1254                 _W(line_size)
1255                 _W(sets)
1256                 _W(ways)
1257                 #undef _W
1258
1259                 #define _W(v)                                           \
1260                         ret = do_write_string(ff, (const char *) c->v); \
1261                         if (ret < 0)                                    \
1262                                 goto out;
1263
1264                 _W(type)
1265                 _W(size)
1266                 _W(map)
1267                 #undef _W
1268         }
1269
1270 out:
1271         for (i = 0; i < cnt; i++)
1272                 cpu_cache_level__free(&caches[i]);
1273         return ret;
1274 }
1275
1276 static int write_stat(struct feat_fd *ff __maybe_unused,
1277                       struct perf_evlist *evlist __maybe_unused)
1278 {
1279         return 0;
1280 }
1281
1282 static int write_sample_time(struct feat_fd *ff,
1283                              struct perf_evlist *evlist)
1284 {
1285         int ret;
1286
1287         ret = do_write(ff, &evlist->first_sample_time,
1288                        sizeof(evlist->first_sample_time));
1289         if (ret < 0)
1290                 return ret;
1291
1292         return do_write(ff, &evlist->last_sample_time,
1293                         sizeof(evlist->last_sample_time));
1294 }
1295
1296
1297 static int memory_node__read(struct memory_node *n, unsigned long idx)
1298 {
1299         unsigned int phys, size = 0;
1300         char path[PATH_MAX];
1301         struct dirent *ent;
1302         DIR *dir;
1303
1304 #define for_each_memory(mem, dir)                                       \
1305         while ((ent = readdir(dir)))                                    \
1306                 if (strcmp(ent->d_name, ".") &&                         \
1307                     strcmp(ent->d_name, "..") &&                        \
1308                     sscanf(ent->d_name, "memory%u", &mem) == 1)
1309
1310         scnprintf(path, PATH_MAX,
1311                   "%s/devices/system/node/node%lu",
1312                   sysfs__mountpoint(), idx);
1313
1314         dir = opendir(path);
1315         if (!dir) {
1316                 pr_warning("failed: cant' open memory sysfs data\n");
1317                 return -1;
1318         }
1319
1320         for_each_memory(phys, dir) {
1321                 size = max(phys, size);
1322         }
1323
1324         size++;
1325
1326         n->set = bitmap_alloc(size);
1327         if (!n->set) {
1328                 closedir(dir);
1329                 return -ENOMEM;
1330         }
1331
1332         n->node = idx;
1333         n->size = size;
1334
1335         rewinddir(dir);
1336
1337         for_each_memory(phys, dir) {
1338                 set_bit(phys, n->set);
1339         }
1340
1341         closedir(dir);
1342         return 0;
1343 }
1344
1345 static int memory_node__sort(const void *a, const void *b)
1346 {
1347         const struct memory_node *na = a;
1348         const struct memory_node *nb = b;
1349
1350         return na->node - nb->node;
1351 }
1352
1353 static int build_mem_topology(struct memory_node *nodes, u64 size, u64 *cntp)
1354 {
1355         char path[PATH_MAX];
1356         struct dirent *ent;
1357         DIR *dir;
1358         u64 cnt = 0;
1359         int ret = 0;
1360
1361         scnprintf(path, PATH_MAX, "%s/devices/system/node/",
1362                   sysfs__mountpoint());
1363
1364         dir = opendir(path);
1365         if (!dir) {
1366                 pr_debug2("%s: could't read %s, does this arch have topology information?\n",
1367                           __func__, path);
1368                 return -1;
1369         }
1370
1371         while (!ret && (ent = readdir(dir))) {
1372                 unsigned int idx;
1373                 int r;
1374
1375                 if (!strcmp(ent->d_name, ".") ||
1376                     !strcmp(ent->d_name, ".."))
1377                         continue;
1378
1379                 r = sscanf(ent->d_name, "node%u", &idx);
1380                 if (r != 1)
1381                         continue;
1382
1383                 if (WARN_ONCE(cnt >= size,
1384                               "failed to write MEM_TOPOLOGY, way too many nodes\n"))
1385                         return -1;
1386
1387                 ret = memory_node__read(&nodes[cnt++], idx);
1388         }
1389
1390         *cntp = cnt;
1391         closedir(dir);
1392
1393         if (!ret)
1394                 qsort(nodes, cnt, sizeof(nodes[0]), memory_node__sort);
1395
1396         return ret;
1397 }
1398
1399 #define MAX_MEMORY_NODES 2000
1400
1401 /*
1402  * The MEM_TOPOLOGY holds physical memory map for every
1403  * node in system. The format of data is as follows:
1404  *
1405  *  0 - version          | for future changes
1406  *  8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
1407  * 16 - count            | number of nodes
1408  *
1409  * For each node we store map of physical indexes for
1410  * each node:
1411  *
1412  * 32 - node id          | node index
1413  * 40 - size             | size of bitmap
1414  * 48 - bitmap           | bitmap of memory indexes that belongs to node
1415  */
1416 static int write_mem_topology(struct feat_fd *ff __maybe_unused,
1417                               struct perf_evlist *evlist __maybe_unused)
1418 {
1419         static struct memory_node nodes[MAX_MEMORY_NODES];
1420         u64 bsize, version = 1, i, nr;
1421         int ret;
1422
1423         ret = sysfs__read_xll("devices/system/memory/block_size_bytes",
1424                               (unsigned long long *) &bsize);
1425         if (ret)
1426                 return ret;
1427
1428         ret = build_mem_topology(&nodes[0], MAX_MEMORY_NODES, &nr);
1429         if (ret)
1430                 return ret;
1431
1432         ret = do_write(ff, &version, sizeof(version));
1433         if (ret < 0)
1434                 goto out;
1435
1436         ret = do_write(ff, &bsize, sizeof(bsize));
1437         if (ret < 0)
1438                 goto out;
1439
1440         ret = do_write(ff, &nr, sizeof(nr));
1441         if (ret < 0)
1442                 goto out;
1443
1444         for (i = 0; i < nr; i++) {
1445                 struct memory_node *n = &nodes[i];
1446
1447                 #define _W(v)                                           \
1448                         ret = do_write(ff, &n->v, sizeof(n->v));        \
1449                         if (ret < 0)                                    \
1450                                 goto out;
1451
1452                 _W(node)
1453                 _W(size)
1454
1455                 #undef _W
1456
1457                 ret = do_write_bitmap(ff, n->set, n->size);
1458                 if (ret < 0)
1459                         goto out;
1460         }
1461
1462 out:
1463         return ret;
1464 }
1465
1466 static void print_hostname(struct feat_fd *ff, FILE *fp)
1467 {
1468         fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
1469 }
1470
1471 static void print_osrelease(struct feat_fd *ff, FILE *fp)
1472 {
1473         fprintf(fp, "# os release : %s\n", ff->ph->env.os_release);
1474 }
1475
1476 static void print_arch(struct feat_fd *ff, FILE *fp)
1477 {
1478         fprintf(fp, "# arch : %s\n", ff->ph->env.arch);
1479 }
1480
1481 static void print_cpudesc(struct feat_fd *ff, FILE *fp)
1482 {
1483         fprintf(fp, "# cpudesc : %s\n", ff->ph->env.cpu_desc);
1484 }
1485
1486 static void print_nrcpus(struct feat_fd *ff, FILE *fp)
1487 {
1488         fprintf(fp, "# nrcpus online : %u\n", ff->ph->env.nr_cpus_online);
1489         fprintf(fp, "# nrcpus avail : %u\n", ff->ph->env.nr_cpus_avail);
1490 }
1491
1492 static void print_version(struct feat_fd *ff, FILE *fp)
1493 {
1494         fprintf(fp, "# perf version : %s\n", ff->ph->env.version);
1495 }
1496
1497 static void print_cmdline(struct feat_fd *ff, FILE *fp)
1498 {
1499         int nr, i;
1500
1501         nr = ff->ph->env.nr_cmdline;
1502
1503         fprintf(fp, "# cmdline : ");
1504
1505         for (i = 0; i < nr; i++) {
1506                 char *argv_i = strdup(ff->ph->env.cmdline_argv[i]);
1507                 if (!argv_i) {
1508                         fprintf(fp, "%s ", ff->ph->env.cmdline_argv[i]);
1509                 } else {
1510                         char *mem = argv_i;
1511                         do {
1512                                 char *quote = strchr(argv_i, '\'');
1513                                 if (!quote)
1514                                         break;
1515                                 *quote++ = '\0';
1516                                 fprintf(fp, "%s\\\'", argv_i);
1517                                 argv_i = quote;
1518                         } while (1);
1519                         fprintf(fp, "%s ", argv_i);
1520                         free(mem);
1521                 }
1522         }
1523         fputc('\n', fp);
1524 }
1525
1526 static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
1527 {
1528         struct perf_header *ph = ff->ph;
1529         int cpu_nr = ph->env.nr_cpus_avail;
1530         int nr, i;
1531         char *str;
1532
1533         nr = ph->env.nr_sibling_cores;
1534         str = ph->env.sibling_cores;
1535
1536         for (i = 0; i < nr; i++) {
1537                 fprintf(fp, "# sibling cores   : %s\n", str);
1538                 str += strlen(str) + 1;
1539         }
1540
1541         nr = ph->env.nr_sibling_threads;
1542         str = ph->env.sibling_threads;
1543
1544         for (i = 0; i < nr; i++) {
1545                 fprintf(fp, "# sibling threads : %s\n", str);
1546                 str += strlen(str) + 1;
1547         }
1548
1549         if (ph->env.cpu != NULL) {
1550                 for (i = 0; i < cpu_nr; i++)
1551                         fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
1552                                 ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
1553         } else
1554                 fprintf(fp, "# Core ID and Socket ID information is not available\n");
1555 }
1556
1557 static void print_clockid(struct feat_fd *ff, FILE *fp)
1558 {
1559         fprintf(fp, "# clockid frequency: %"PRIu64" MHz\n",
1560                 ff->ph->env.clockid_res_ns * 1000);
1561 }
1562
1563 static void free_event_desc(struct perf_evsel *events)
1564 {
1565         struct perf_evsel *evsel;
1566
1567         if (!events)
1568                 return;
1569
1570         for (evsel = events; evsel->attr.size; evsel++) {
1571                 zfree(&evsel->name);
1572                 zfree(&evsel->id);
1573         }
1574
1575         free(events);
1576 }
1577
1578 static struct perf_evsel *read_event_desc(struct feat_fd *ff)
1579 {
1580         struct perf_evsel *evsel, *events = NULL;
1581         u64 *id;
1582         void *buf = NULL;
1583         u32 nre, sz, nr, i, j;
1584         size_t msz;
1585
1586         /* number of events */
1587         if (do_read_u32(ff, &nre))
1588                 goto error;
1589
1590         if (do_read_u32(ff, &sz))
1591                 goto error;
1592
1593         /* buffer to hold on file attr struct */
1594         buf = malloc(sz);
1595         if (!buf)
1596                 goto error;
1597
1598         /* the last event terminates with evsel->attr.size == 0: */
1599         events = calloc(nre + 1, sizeof(*events));
1600         if (!events)
1601                 goto error;
1602
1603         msz = sizeof(evsel->attr);
1604         if (sz < msz)
1605                 msz = sz;
1606
1607         for (i = 0, evsel = events; i < nre; evsel++, i++) {
1608                 evsel->idx = i;
1609
1610                 /*
1611                  * must read entire on-file attr struct to
1612                  * sync up with layout.
1613                  */
1614                 if (__do_read(ff, buf, sz))
1615                         goto error;
1616
1617                 if (ff->ph->needs_swap)
1618                         perf_event__attr_swap(buf);
1619
1620                 memcpy(&evsel->attr, buf, msz);
1621
1622                 if (do_read_u32(ff, &nr))
1623                         goto error;
1624
1625                 if (ff->ph->needs_swap)
1626                         evsel->needs_swap = true;
1627
1628                 evsel->name = do_read_string(ff);
1629                 if (!evsel->name)
1630                         goto error;
1631
1632                 if (!nr)
1633                         continue;
1634
1635                 id = calloc(nr, sizeof(*id));
1636                 if (!id)
1637                         goto error;
1638                 evsel->ids = nr;
1639                 evsel->id = id;
1640
1641                 for (j = 0 ; j < nr; j++) {
1642                         if (do_read_u64(ff, id))
1643                                 goto error;
1644                         id++;
1645                 }
1646         }
1647 out:
1648         free(buf);
1649         return events;
1650 error:
1651         free_event_desc(events);
1652         events = NULL;
1653         goto out;
1654 }
1655
1656 static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1657                                 void *priv __maybe_unused)
1658 {
1659         return fprintf(fp, ", %s = %s", name, val);
1660 }
1661
1662 static void print_event_desc(struct feat_fd *ff, FILE *fp)
1663 {
1664         struct perf_evsel *evsel, *events;
1665         u32 j;
1666         u64 *id;
1667
1668         if (ff->events)
1669                 events = ff->events;
1670         else
1671                 events = read_event_desc(ff);
1672
1673         if (!events) {
1674                 fprintf(fp, "# event desc: not available or unable to read\n");
1675                 return;
1676         }
1677
1678         for (evsel = events; evsel->attr.size; evsel++) {
1679                 fprintf(fp, "# event : name = %s, ", evsel->name);
1680
1681                 if (evsel->ids) {
1682                         fprintf(fp, ", id = {");
1683                         for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1684                                 if (j)
1685                                         fputc(',', fp);
1686                                 fprintf(fp, " %"PRIu64, *id);
1687                         }
1688                         fprintf(fp, " }");
1689                 }
1690
1691                 perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1692
1693                 fputc('\n', fp);
1694         }
1695
1696         free_event_desc(events);
1697         ff->events = NULL;
1698 }
1699
1700 static void print_total_mem(struct feat_fd *ff, FILE *fp)
1701 {
1702         fprintf(fp, "# total memory : %llu kB\n", ff->ph->env.total_mem);
1703 }
1704
1705 static void print_numa_topology(struct feat_fd *ff, FILE *fp)
1706 {
1707         int i;
1708         struct numa_node *n;
1709
1710         for (i = 0; i < ff->ph->env.nr_numa_nodes; i++) {
1711                 n = &ff->ph->env.numa_nodes[i];
1712
1713                 fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
1714                             " free = %"PRIu64" kB\n",
1715                         n->node, n->mem_total, n->mem_free);
1716
1717                 fprintf(fp, "# node%u cpu list : ", n->node);
1718                 cpu_map__fprintf(n->map, fp);
1719         }
1720 }
1721
1722 static void print_cpuid(struct feat_fd *ff, FILE *fp)
1723 {
1724         fprintf(fp, "# cpuid : %s\n", ff->ph->env.cpuid);
1725 }
1726
1727 static void print_branch_stack(struct feat_fd *ff __maybe_unused, FILE *fp)
1728 {
1729         fprintf(fp, "# contains samples with branch stack\n");
1730 }
1731
1732 static void print_auxtrace(struct feat_fd *ff __maybe_unused, FILE *fp)
1733 {
1734         fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1735 }
1736
1737 static void print_stat(struct feat_fd *ff __maybe_unused, FILE *fp)
1738 {
1739         fprintf(fp, "# contains stat data\n");
1740 }
1741
1742 static void print_cache(struct feat_fd *ff, FILE *fp __maybe_unused)
1743 {
1744         int i;
1745
1746         fprintf(fp, "# CPU cache info:\n");
1747         for (i = 0; i < ff->ph->env.caches_cnt; i++) {
1748                 fprintf(fp, "#  ");
1749                 cpu_cache_level__fprintf(fp, &ff->ph->env.caches[i]);
1750         }
1751 }
1752
1753 static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
1754 {
1755         const char *delimiter = "# pmu mappings: ";
1756         char *str, *tmp;
1757         u32 pmu_num;
1758         u32 type;
1759
1760         pmu_num = ff->ph->env.nr_pmu_mappings;
1761         if (!pmu_num) {
1762                 fprintf(fp, "# pmu mappings: not available\n");
1763                 return;
1764         }
1765
1766         str = ff->ph->env.pmu_mappings;
1767
1768         while (pmu_num) {
1769                 type = strtoul(str, &tmp, 0);
1770                 if (*tmp != ':')
1771                         goto error;
1772
1773                 str = tmp + 1;
1774                 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1775
1776                 delimiter = ", ";
1777                 str += strlen(str) + 1;
1778                 pmu_num--;
1779         }
1780
1781         fprintf(fp, "\n");
1782
1783         if (!pmu_num)
1784                 return;
1785 error:
1786         fprintf(fp, "# pmu mappings: unable to read\n");
1787 }
1788
1789 static void print_group_desc(struct feat_fd *ff, FILE *fp)
1790 {
1791         struct perf_session *session;
1792         struct perf_evsel *evsel;
1793         u32 nr = 0;
1794
1795         session = container_of(ff->ph, struct perf_session, header);
1796
1797         evlist__for_each_entry(session->evlist, evsel) {
1798                 if (perf_evsel__is_group_leader(evsel) &&
1799                     evsel->nr_members > 1) {
1800                         fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1801                                 perf_evsel__name(evsel));
1802
1803                         nr = evsel->nr_members - 1;
1804                 } else if (nr) {
1805                         fprintf(fp, ",%s", perf_evsel__name(evsel));
1806
1807                         if (--nr == 0)
1808                                 fprintf(fp, "}\n");
1809                 }
1810         }
1811 }
1812
1813 static void print_sample_time(struct feat_fd *ff, FILE *fp)
1814 {
1815         struct perf_session *session;
1816         char time_buf[32];
1817         double d;
1818
1819         session = container_of(ff->ph, struct perf_session, header);
1820
1821         timestamp__scnprintf_usec(session->evlist->first_sample_time,
1822                                   time_buf, sizeof(time_buf));
1823         fprintf(fp, "# time of first sample : %s\n", time_buf);
1824
1825         timestamp__scnprintf_usec(session->evlist->last_sample_time,
1826                                   time_buf, sizeof(time_buf));
1827         fprintf(fp, "# time of last sample : %s\n", time_buf);
1828
1829         d = (double)(session->evlist->last_sample_time -
1830                 session->evlist->first_sample_time) / NSEC_PER_MSEC;
1831
1832         fprintf(fp, "# sample duration : %10.3f ms\n", d);
1833 }
1834
1835 static void memory_node__fprintf(struct memory_node *n,
1836                                  unsigned long long bsize, FILE *fp)
1837 {
1838         char buf_map[100], buf_size[50];
1839         unsigned long long size;
1840
1841         size = bsize * bitmap_weight(n->set, n->size);
1842         unit_number__scnprintf(buf_size, 50, size);
1843
1844         bitmap_scnprintf(n->set, n->size, buf_map, 100);
1845         fprintf(fp, "#  %3" PRIu64 " [%s]: %s\n", n->node, buf_size, buf_map);
1846 }
1847
1848 static void print_mem_topology(struct feat_fd *ff, FILE *fp)
1849 {
1850         struct memory_node *nodes;
1851         int i, nr;
1852
1853         nodes = ff->ph->env.memory_nodes;
1854         nr    = ff->ph->env.nr_memory_nodes;
1855
1856         fprintf(fp, "# memory nodes (nr %d, block size 0x%llx):\n",
1857                 nr, ff->ph->env.memory_bsize);
1858
1859         for (i = 0; i < nr; i++) {
1860                 memory_node__fprintf(&nodes[i], ff->ph->env.memory_bsize, fp);
1861         }
1862 }
1863
1864 static int __event_process_build_id(struct build_id_event *bev,
1865                                     char *filename,
1866                                     struct perf_session *session)
1867 {
1868         int err = -1;
1869         struct machine *machine;
1870         u16 cpumode;
1871         struct dso *dso;
1872         enum dso_kernel_type dso_type;
1873
1874         machine = perf_session__findnew_machine(session, bev->pid);
1875         if (!machine)
1876                 goto out;
1877
1878         cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1879
1880         switch (cpumode) {
1881         case PERF_RECORD_MISC_KERNEL:
1882                 dso_type = DSO_TYPE_KERNEL;
1883                 break;
1884         case PERF_RECORD_MISC_GUEST_KERNEL:
1885                 dso_type = DSO_TYPE_GUEST_KERNEL;
1886                 break;
1887         case PERF_RECORD_MISC_USER:
1888         case PERF_RECORD_MISC_GUEST_USER:
1889                 dso_type = DSO_TYPE_USER;
1890                 break;
1891         default:
1892                 goto out;
1893         }
1894
1895         dso = machine__findnew_dso(machine, filename);
1896         if (dso != NULL) {
1897                 char sbuild_id[SBUILD_ID_SIZE];
1898
1899                 dso__set_build_id(dso, &bev->build_id);
1900
1901                 if (dso_type != DSO_TYPE_USER) {
1902                         struct kmod_path m = { .name = NULL, };
1903
1904                         if (!kmod_path__parse_name(&m, filename) && m.kmod)
1905                                 dso__set_module_info(dso, &m, machine);
1906                         else
1907                                 dso->kernel = dso_type;
1908
1909                         free(m.name);
1910                 }
1911
1912                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1913                                   sbuild_id);
1914                 pr_debug("build id event received for %s: %s\n",
1915                          dso->long_name, sbuild_id);
1916                 dso__put(dso);
1917         }
1918
1919         err = 0;
1920 out:
1921         return err;
1922 }
1923
1924 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1925                                                  int input, u64 offset, u64 size)
1926 {
1927         struct perf_session *session = container_of(header, struct perf_session, header);
1928         struct {
1929                 struct perf_event_header   header;
1930                 u8                         build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1931                 char                       filename[0];
1932         } old_bev;
1933         struct build_id_event bev;
1934         char filename[PATH_MAX];
1935         u64 limit = offset + size;
1936
1937         while (offset < limit) {
1938                 ssize_t len;
1939
1940                 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1941                         return -1;
1942
1943                 if (header->needs_swap)
1944                         perf_event_header__bswap(&old_bev.header);
1945
1946                 len = old_bev.header.size - sizeof(old_bev);
1947                 if (readn(input, filename, len) != len)
1948                         return -1;
1949
1950                 bev.header = old_bev.header;
1951
1952                 /*
1953                  * As the pid is the missing value, we need to fill
1954                  * it properly. The header.misc value give us nice hint.
1955                  */
1956                 bev.pid = HOST_KERNEL_ID;
1957                 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1958                     bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1959                         bev.pid = DEFAULT_GUEST_KERNEL_ID;
1960
1961                 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1962                 __event_process_build_id(&bev, filename, session);
1963
1964                 offset += bev.header.size;
1965         }
1966
1967         return 0;
1968 }
1969
1970 static int perf_header__read_build_ids(struct perf_header *header,
1971                                        int input, u64 offset, u64 size)
1972 {
1973         struct perf_session *session = container_of(header, struct perf_session, header);
1974         struct build_id_event bev;
1975         char filename[PATH_MAX];
1976         u64 limit = offset + size, orig_offset = offset;
1977         int err = -1;
1978
1979         while (offset < limit) {
1980                 ssize_t len;
1981
1982                 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1983                         goto out;
1984
1985                 if (header->needs_swap)
1986                         perf_event_header__bswap(&bev.header);
1987
1988                 len = bev.header.size - sizeof(bev);
1989                 if (readn(input, filename, len) != len)
1990                         goto out;
1991                 /*
1992                  * The a1645ce1 changeset:
1993                  *
1994                  * "perf: 'perf kvm' tool for monitoring guest performance from host"
1995                  *
1996                  * Added a field to struct build_id_event that broke the file
1997                  * format.
1998                  *
1999                  * Since the kernel build-id is the first entry, process the
2000                  * table using the old format if the well known
2001                  * '[kernel.kallsyms]' string for the kernel build-id has the
2002                  * first 4 characters chopped off (where the pid_t sits).
2003                  */
2004                 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
2005                         if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
2006                                 return -1;
2007                         return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
2008                 }
2009
2010                 __event_process_build_id(&bev, filename, session);
2011
2012                 offset += bev.header.size;
2013         }
2014         err = 0;
2015 out:
2016         return err;
2017 }
2018
2019 /* Macro for features that simply need to read and store a string. */
2020 #define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
2021 static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
2022 {\
2023         ff->ph->env.__feat_env = do_read_string(ff); \
2024         return ff->ph->env.__feat_env ? 0 : -ENOMEM; \
2025 }
2026
2027 FEAT_PROCESS_STR_FUN(hostname, hostname);
2028 FEAT_PROCESS_STR_FUN(osrelease, os_release);
2029 FEAT_PROCESS_STR_FUN(version, version);
2030 FEAT_PROCESS_STR_FUN(arch, arch);
2031 FEAT_PROCESS_STR_FUN(cpudesc, cpu_desc);
2032 FEAT_PROCESS_STR_FUN(cpuid, cpuid);
2033
2034 static int process_tracing_data(struct feat_fd *ff, void *data)
2035 {
2036         ssize_t ret = trace_report(ff->fd, data, false);
2037
2038         return ret < 0 ? -1 : 0;
2039 }
2040
2041 static int process_build_id(struct feat_fd *ff, void *data __maybe_unused)
2042 {
2043         if (perf_header__read_build_ids(ff->ph, ff->fd, ff->offset, ff->size))
2044                 pr_debug("Failed to read buildids, continuing...\n");
2045         return 0;
2046 }
2047
2048 static int process_nrcpus(struct feat_fd *ff, void *data __maybe_unused)
2049 {
2050         int ret;
2051         u32 nr_cpus_avail, nr_cpus_online;
2052
2053         ret = do_read_u32(ff, &nr_cpus_avail);
2054         if (ret)
2055                 return ret;
2056
2057         ret = do_read_u32(ff, &nr_cpus_online);
2058         if (ret)
2059                 return ret;
2060         ff->ph->env.nr_cpus_avail = (int)nr_cpus_avail;
2061         ff->ph->env.nr_cpus_online = (int)nr_cpus_online;
2062         return 0;
2063 }
2064
2065 static int process_total_mem(struct feat_fd *ff, void *data __maybe_unused)
2066 {
2067         u64 total_mem;
2068         int ret;
2069
2070         ret = do_read_u64(ff, &total_mem);
2071         if (ret)
2072                 return -1;
2073         ff->ph->env.total_mem = (unsigned long long)total_mem;
2074         return 0;
2075 }
2076
2077 static struct perf_evsel *
2078 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
2079 {
2080         struct perf_evsel *evsel;
2081
2082         evlist__for_each_entry(evlist, evsel) {
2083                 if (evsel->idx == idx)
2084                         return evsel;
2085         }
2086
2087         return NULL;
2088 }
2089
2090 static void
2091 perf_evlist__set_event_name(struct perf_evlist *evlist,
2092                             struct perf_evsel *event)
2093 {
2094         struct perf_evsel *evsel;
2095
2096         if (!event->name)
2097                 return;
2098
2099         evsel = perf_evlist__find_by_index(evlist, event->idx);
2100         if (!evsel)
2101                 return;
2102
2103         if (evsel->name)
2104                 return;
2105
2106         evsel->name = strdup(event->name);
2107 }
2108
2109 static int
2110 process_event_desc(struct feat_fd *ff, void *data __maybe_unused)
2111 {
2112         struct perf_session *session;
2113         struct perf_evsel *evsel, *events = read_event_desc(ff);
2114
2115         if (!events)
2116                 return 0;
2117
2118         session = container_of(ff->ph, struct perf_session, header);
2119
2120         if (session->data->is_pipe) {
2121                 /* Save events for reading later by print_event_desc,
2122                  * since they can't be read again in pipe mode. */
2123                 ff->events = events;
2124         }
2125
2126         for (evsel = events; evsel->attr.size; evsel++)
2127                 perf_evlist__set_event_name(session->evlist, evsel);
2128
2129         if (!session->data->is_pipe)
2130                 free_event_desc(events);
2131
2132         return 0;
2133 }
2134
2135 static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)
2136 {
2137         char *str, *cmdline = NULL, **argv = NULL;
2138         u32 nr, i, len = 0;
2139
2140         if (do_read_u32(ff, &nr))
2141                 return -1;
2142
2143         ff->ph->env.nr_cmdline = nr;
2144
2145         cmdline = zalloc(ff->size + nr + 1);
2146         if (!cmdline)
2147                 return -1;
2148
2149         argv = zalloc(sizeof(char *) * (nr + 1));
2150         if (!argv)
2151                 goto error;
2152
2153         for (i = 0; i < nr; i++) {
2154                 str = do_read_string(ff);
2155                 if (!str)
2156                         goto error;
2157
2158                 argv[i] = cmdline + len;
2159                 memcpy(argv[i], str, strlen(str) + 1);
2160                 len += strlen(str) + 1;
2161                 free(str);
2162         }
2163         ff->ph->env.cmdline = cmdline;
2164         ff->ph->env.cmdline_argv = (const char **) argv;
2165         return 0;
2166
2167 error:
2168         free(argv);
2169         free(cmdline);
2170         return -1;
2171 }
2172
2173 static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
2174 {
2175         u32 nr, i;
2176         char *str;
2177         struct strbuf sb;
2178         int cpu_nr = ff->ph->env.nr_cpus_avail;
2179         u64 size = 0;
2180         struct perf_header *ph = ff->ph;
2181         bool do_core_id_test = true;
2182
2183         ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
2184         if (!ph->env.cpu)
2185                 return -1;
2186
2187         if (do_read_u32(ff, &nr))
2188                 goto free_cpu;
2189
2190         ph->env.nr_sibling_cores = nr;
2191         size += sizeof(u32);
2192         if (strbuf_init(&sb, 128) < 0)
2193                 goto free_cpu;
2194
2195         for (i = 0; i < nr; i++) {
2196                 str = do_read_string(ff);
2197                 if (!str)
2198                         goto error;
2199
2200                 /* include a NULL character at the end */
2201                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2202                         goto error;
2203                 size += string_size(str);
2204                 free(str);
2205         }
2206         ph->env.sibling_cores = strbuf_detach(&sb, NULL);
2207
2208         if (do_read_u32(ff, &nr))
2209                 return -1;
2210
2211         ph->env.nr_sibling_threads = nr;
2212         size += sizeof(u32);
2213
2214         for (i = 0; i < nr; i++) {
2215                 str = do_read_string(ff);
2216                 if (!str)
2217                         goto error;
2218
2219                 /* include a NULL character at the end */
2220                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2221                         goto error;
2222                 size += string_size(str);
2223                 free(str);
2224         }
2225         ph->env.sibling_threads = strbuf_detach(&sb, NULL);
2226
2227         /*
2228          * The header may be from old perf,
2229          * which doesn't include core id and socket id information.
2230          */
2231         if (ff->size <= size) {
2232                 zfree(&ph->env.cpu);
2233                 return 0;
2234         }
2235
2236         /* On s390 the socket_id number is not related to the numbers of cpus.
2237          * The socket_id number might be higher than the numbers of cpus.
2238          * This depends on the configuration.
2239          */
2240         if (ph->env.arch && !strncmp(ph->env.arch, "s390", 4))
2241                 do_core_id_test = false;
2242
2243         for (i = 0; i < (u32)cpu_nr; i++) {
2244                 if (do_read_u32(ff, &nr))
2245                         goto free_cpu;
2246
2247                 ph->env.cpu[i].core_id = nr;
2248
2249                 if (do_read_u32(ff, &nr))
2250                         goto free_cpu;
2251
2252                 if (do_core_id_test && nr != (u32)-1 && nr > (u32)cpu_nr) {
2253                         pr_debug("socket_id number is too big."
2254                                  "You may need to upgrade the perf tool.\n");
2255                         goto free_cpu;
2256                 }
2257
2258                 ph->env.cpu[i].socket_id = nr;
2259         }
2260
2261         return 0;
2262
2263 error:
2264         strbuf_release(&sb);
2265 free_cpu:
2266         zfree(&ph->env.cpu);
2267         return -1;
2268 }
2269
2270 static int process_numa_topology(struct feat_fd *ff, void *data __maybe_unused)
2271 {
2272         struct numa_node *nodes, *n;
2273         u32 nr, i;
2274         char *str;
2275
2276         /* nr nodes */
2277         if (do_read_u32(ff, &nr))
2278                 return -1;
2279
2280         nodes = zalloc(sizeof(*nodes) * nr);
2281         if (!nodes)
2282                 return -ENOMEM;
2283
2284         for (i = 0; i < nr; i++) {
2285                 n = &nodes[i];
2286
2287                 /* node number */
2288                 if (do_read_u32(ff, &n->node))
2289                         goto error;
2290
2291                 if (do_read_u64(ff, &n->mem_total))
2292                         goto error;
2293
2294                 if (do_read_u64(ff, &n->mem_free))
2295                         goto error;
2296
2297                 str = do_read_string(ff);
2298                 if (!str)
2299                         goto error;
2300
2301                 n->map = cpu_map__new(str);
2302                 if (!n->map)
2303                         goto error;
2304
2305                 free(str);
2306         }
2307         ff->ph->env.nr_numa_nodes = nr;
2308         ff->ph->env.numa_nodes = nodes;
2309         return 0;
2310
2311 error:
2312         free(nodes);
2313         return -1;
2314 }
2315
2316 static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)
2317 {
2318         char *name;
2319         u32 pmu_num;
2320         u32 type;
2321         struct strbuf sb;
2322
2323         if (do_read_u32(ff, &pmu_num))
2324                 return -1;
2325
2326         if (!pmu_num) {
2327                 pr_debug("pmu mappings not available\n");
2328                 return 0;
2329         }
2330
2331         ff->ph->env.nr_pmu_mappings = pmu_num;
2332         if (strbuf_init(&sb, 128) < 0)
2333                 return -1;
2334
2335         while (pmu_num) {
2336                 if (do_read_u32(ff, &type))
2337                         goto error;
2338
2339                 name = do_read_string(ff);
2340                 if (!name)
2341                         goto error;
2342
2343                 if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
2344                         goto error;
2345                 /* include a NULL character at the end */
2346                 if (strbuf_add(&sb, "", 1) < 0)
2347                         goto error;
2348
2349                 if (!strcmp(name, "msr"))
2350                         ff->ph->env.msr_pmu_type = type;
2351
2352                 free(name);
2353                 pmu_num--;
2354         }
2355         ff->ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
2356         return 0;
2357
2358 error:
2359         strbuf_release(&sb);
2360         return -1;
2361 }
2362
2363 static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)
2364 {
2365         size_t ret = -1;
2366         u32 i, nr, nr_groups;
2367         struct perf_session *session;
2368         struct perf_evsel *evsel, *leader = NULL;
2369         struct group_desc {
2370                 char *name;
2371                 u32 leader_idx;
2372                 u32 nr_members;
2373         } *desc;
2374
2375         if (do_read_u32(ff, &nr_groups))
2376                 return -1;
2377
2378         ff->ph->env.nr_groups = nr_groups;
2379         if (!nr_groups) {
2380                 pr_debug("group desc not available\n");
2381                 return 0;
2382         }
2383
2384         desc = calloc(nr_groups, sizeof(*desc));
2385         if (!desc)
2386                 return -1;
2387
2388         for (i = 0; i < nr_groups; i++) {
2389                 desc[i].name = do_read_string(ff);
2390                 if (!desc[i].name)
2391                         goto out_free;
2392
2393                 if (do_read_u32(ff, &desc[i].leader_idx))
2394                         goto out_free;
2395
2396                 if (do_read_u32(ff, &desc[i].nr_members))
2397                         goto out_free;
2398         }
2399
2400         /*
2401          * Rebuild group relationship based on the group_desc
2402          */
2403         session = container_of(ff->ph, struct perf_session, header);
2404         session->evlist->nr_groups = nr_groups;
2405
2406         i = nr = 0;
2407         evlist__for_each_entry(session->evlist, evsel) {
2408                 if (evsel->idx == (int) desc[i].leader_idx) {
2409                         evsel->leader = evsel;
2410                         /* {anon_group} is a dummy name */
2411                         if (strcmp(desc[i].name, "{anon_group}")) {
2412                                 evsel->group_name = desc[i].name;
2413                                 desc[i].name = NULL;
2414                         }
2415                         evsel->nr_members = desc[i].nr_members;
2416
2417                         if (i >= nr_groups || nr > 0) {
2418                                 pr_debug("invalid group desc\n");
2419                                 goto out_free;
2420                         }
2421
2422                         leader = evsel;
2423                         nr = evsel->nr_members - 1;
2424                         i++;
2425                 } else if (nr) {
2426                         /* This is a group member */
2427                         evsel->leader = leader;
2428
2429                         nr--;
2430                 }
2431         }
2432
2433         if (i != nr_groups || nr != 0) {
2434                 pr_debug("invalid group desc\n");
2435                 goto out_free;
2436         }
2437
2438         ret = 0;
2439 out_free:
2440         for (i = 0; i < nr_groups; i++)
2441                 zfree(&desc[i].name);
2442         free(desc);
2443
2444         return ret;
2445 }
2446
2447 static int process_auxtrace(struct feat_fd *ff, void *data __maybe_unused)
2448 {
2449         struct perf_session *session;
2450         int err;
2451
2452         session = container_of(ff->ph, struct perf_session, header);
2453
2454         err = auxtrace_index__process(ff->fd, ff->size, session,
2455                                       ff->ph->needs_swap);
2456         if (err < 0)
2457                 pr_err("Failed to process auxtrace index\n");
2458         return err;
2459 }
2460
2461 static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
2462 {
2463         struct cpu_cache_level *caches;
2464         u32 cnt, i, version;
2465
2466         if (do_read_u32(ff, &version))
2467                 return -1;
2468
2469         if (version != 1)
2470                 return -1;
2471
2472         if (do_read_u32(ff, &cnt))
2473                 return -1;
2474
2475         caches = zalloc(sizeof(*caches) * cnt);
2476         if (!caches)
2477                 return -1;
2478
2479         for (i = 0; i < cnt; i++) {
2480                 struct cpu_cache_level c;
2481
2482                 #define _R(v)                                           \
2483                         if (do_read_u32(ff, &c.v))\
2484                                 goto out_free_caches;                   \
2485
2486                 _R(level)
2487                 _R(line_size)
2488                 _R(sets)
2489                 _R(ways)
2490                 #undef _R
2491
2492                 #define _R(v)                                   \
2493                         c.v = do_read_string(ff);               \
2494                         if (!c.v)                               \
2495                                 goto out_free_caches;
2496
2497                 _R(type)
2498                 _R(size)
2499                 _R(map)
2500                 #undef _R
2501
2502                 caches[i] = c;
2503         }
2504
2505         ff->ph->env.caches = caches;
2506         ff->ph->env.caches_cnt = cnt;
2507         return 0;
2508 out_free_caches:
2509         free(caches);
2510         return -1;
2511 }
2512
2513 static int process_sample_time(struct feat_fd *ff, void *data __maybe_unused)
2514 {
2515         struct perf_session *session;
2516         u64 first_sample_time, last_sample_time;
2517         int ret;
2518
2519         session = container_of(ff->ph, struct perf_session, header);
2520
2521         ret = do_read_u64(ff, &first_sample_time);
2522         if (ret)
2523                 return -1;
2524
2525         ret = do_read_u64(ff, &last_sample_time);
2526         if (ret)
2527                 return -1;
2528
2529         session->evlist->first_sample_time = first_sample_time;
2530         session->evlist->last_sample_time = last_sample_time;
2531         return 0;
2532 }
2533
2534 static int process_mem_topology(struct feat_fd *ff,
2535                                 void *data __maybe_unused)
2536 {
2537         struct memory_node *nodes;
2538         u64 version, i, nr, bsize;
2539         int ret = -1;
2540
2541         if (do_read_u64(ff, &version))
2542                 return -1;
2543
2544         if (version != 1)
2545                 return -1;
2546
2547         if (do_read_u64(ff, &bsize))
2548                 return -1;
2549
2550         if (do_read_u64(ff, &nr))
2551                 return -1;
2552
2553         nodes = zalloc(sizeof(*nodes) * nr);
2554         if (!nodes)
2555                 return -1;
2556
2557         for (i = 0; i < nr; i++) {
2558                 struct memory_node n;
2559
2560                 #define _R(v)                           \
2561                         if (do_read_u64(ff, &n.v))      \
2562                                 goto out;               \
2563
2564                 _R(node)
2565                 _R(size)
2566
2567                 #undef _R
2568
2569                 if (do_read_bitmap(ff, &n.set, &n.size))
2570                         goto out;
2571
2572                 nodes[i] = n;
2573         }
2574
2575         ff->ph->env.memory_bsize    = bsize;
2576         ff->ph->env.memory_nodes    = nodes;
2577         ff->ph->env.nr_memory_nodes = nr;
2578         ret = 0;
2579
2580 out:
2581         if (ret)
2582                 free(nodes);
2583         return ret;
2584 }
2585
2586 static int process_clockid(struct feat_fd *ff,
2587                            void *data __maybe_unused)
2588 {
2589         if (do_read_u64(ff, &ff->ph->env.clockid_res_ns))
2590                 return -1;
2591
2592         return 0;
2593 }
2594
2595 struct feature_ops {
2596         int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
2597         void (*print)(struct feat_fd *ff, FILE *fp);
2598         int (*process)(struct feat_fd *ff, void *data);
2599         const char *name;
2600         bool full_only;
2601         bool synthesize;
2602 };
2603
2604 #define FEAT_OPR(n, func, __full_only) \
2605         [HEADER_##n] = {                                        \
2606                 .name       = __stringify(n),                   \
2607                 .write      = write_##func,                     \
2608                 .print      = print_##func,                     \
2609                 .full_only  = __full_only,                      \
2610                 .process    = process_##func,                   \
2611                 .synthesize = true                              \
2612         }
2613
2614 #define FEAT_OPN(n, func, __full_only) \
2615         [HEADER_##n] = {                                        \
2616                 .name       = __stringify(n),                   \
2617                 .write      = write_##func,                     \
2618                 .print      = print_##func,                     \
2619                 .full_only  = __full_only,                      \
2620                 .process    = process_##func                    \
2621         }
2622
2623 /* feature_ops not implemented: */
2624 #define print_tracing_data      NULL
2625 #define print_build_id          NULL
2626
2627 #define process_branch_stack    NULL
2628 #define process_stat            NULL
2629
2630
2631 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2632         FEAT_OPN(TRACING_DATA,  tracing_data,   false),
2633         FEAT_OPN(BUILD_ID,      build_id,       false),
2634         FEAT_OPR(HOSTNAME,      hostname,       false),
2635         FEAT_OPR(OSRELEASE,     osrelease,      false),
2636         FEAT_OPR(VERSION,       version,        false),
2637         FEAT_OPR(ARCH,          arch,           false),
2638         FEAT_OPR(NRCPUS,        nrcpus,         false),
2639         FEAT_OPR(CPUDESC,       cpudesc,        false),
2640         FEAT_OPR(CPUID,         cpuid,          false),
2641         FEAT_OPR(TOTAL_MEM,     total_mem,      false),
2642         FEAT_OPR(EVENT_DESC,    event_desc,     false),
2643         FEAT_OPR(CMDLINE,       cmdline,        false),
2644         FEAT_OPR(CPU_TOPOLOGY,  cpu_topology,   true),
2645         FEAT_OPR(NUMA_TOPOLOGY, numa_topology,  true),
2646         FEAT_OPN(BRANCH_STACK,  branch_stack,   false),
2647         FEAT_OPR(PMU_MAPPINGS,  pmu_mappings,   false),
2648         FEAT_OPR(GROUP_DESC,    group_desc,     false),
2649         FEAT_OPN(AUXTRACE,      auxtrace,       false),
2650         FEAT_OPN(STAT,          stat,           false),
2651         FEAT_OPN(CACHE,         cache,          true),
2652         FEAT_OPR(SAMPLE_TIME,   sample_time,    false),
2653         FEAT_OPR(MEM_TOPOLOGY,  mem_topology,   true),
2654         FEAT_OPR(CLOCKID,       clockid,        false)
2655 };
2656
2657 struct header_print_data {
2658         FILE *fp;
2659         bool full; /* extended list of headers */
2660 };
2661
2662 static int perf_file_section__fprintf_info(struct perf_file_section *section,
2663                                            struct perf_header *ph,
2664                                            int feat, int fd, void *data)
2665 {
2666         struct header_print_data *hd = data;
2667         struct feat_fd ff;
2668
2669         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2670                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2671                                 "%d, continuing...\n", section->offset, feat);
2672                 return 0;
2673         }
2674         if (feat >= HEADER_LAST_FEATURE) {
2675                 pr_warning("unknown feature %d\n", feat);
2676                 return 0;
2677         }
2678         if (!feat_ops[feat].print)
2679                 return 0;
2680
2681         ff = (struct  feat_fd) {
2682                 .fd = fd,
2683                 .ph = ph,
2684         };
2685
2686         if (!feat_ops[feat].full_only || hd->full)
2687                 feat_ops[feat].print(&ff, hd->fp);
2688         else
2689                 fprintf(hd->fp, "# %s info available, use -I to display\n",
2690                         feat_ops[feat].name);
2691
2692         return 0;
2693 }
2694
2695 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2696 {
2697         struct header_print_data hd;
2698         struct perf_header *header = &session->header;
2699         int fd = perf_data__fd(session->data);
2700         struct stat st;
2701         time_t stctime;
2702         int ret, bit;
2703
2704         hd.fp = fp;
2705         hd.full = full;
2706
2707         ret = fstat(fd, &st);
2708         if (ret == -1)
2709                 return -1;
2710
2711         stctime = st.st_ctime;
2712         fprintf(fp, "# captured on    : %s", ctime(&stctime));
2713
2714         fprintf(fp, "# header version : %u\n", header->version);
2715         fprintf(fp, "# data offset    : %" PRIu64 "\n", header->data_offset);
2716         fprintf(fp, "# data size      : %" PRIu64 "\n", header->data_size);
2717         fprintf(fp, "# feat offset    : %" PRIu64 "\n", header->feat_offset);
2718
2719         perf_header__process_sections(header, fd, &hd,
2720                                       perf_file_section__fprintf_info);
2721
2722         if (session->data->is_pipe)
2723                 return 0;
2724
2725         fprintf(fp, "# missing features: ");
2726         for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {
2727                 if (bit)
2728                         fprintf(fp, "%s ", feat_ops[bit].name);
2729         }
2730
2731         fprintf(fp, "\n");
2732         return 0;
2733 }
2734
2735 static int do_write_feat(struct feat_fd *ff, int type,
2736                          struct perf_file_section **p,
2737                          struct perf_evlist *evlist)
2738 {
2739         int err;
2740         int ret = 0;
2741
2742         if (perf_header__has_feat(ff->ph, type)) {
2743                 if (!feat_ops[type].write)
2744                         return -1;
2745
2746                 if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
2747                         return -1;
2748
2749                 (*p)->offset = lseek(ff->fd, 0, SEEK_CUR);
2750
2751                 err = feat_ops[type].write(ff, evlist);
2752                 if (err < 0) {
2753                         pr_debug("failed to write feature %s\n", feat_ops[type].name);
2754
2755                         /* undo anything written */
2756                         lseek(ff->fd, (*p)->offset, SEEK_SET);
2757
2758                         return -1;
2759                 }
2760                 (*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;
2761                 (*p)++;
2762         }
2763         return ret;
2764 }
2765
2766 static int perf_header__adds_write(struct perf_header *header,
2767                                    struct perf_evlist *evlist, int fd)
2768 {
2769         int nr_sections;
2770         struct feat_fd ff;
2771         struct perf_file_section *feat_sec, *p;
2772         int sec_size;
2773         u64 sec_start;
2774         int feat;
2775         int err;
2776
2777         ff = (struct feat_fd){
2778                 .fd  = fd,
2779                 .ph = header,
2780         };
2781
2782         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2783         if (!nr_sections)
2784                 return 0;
2785
2786         feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2787         if (feat_sec == NULL)
2788                 return -ENOMEM;
2789
2790         sec_size = sizeof(*feat_sec) * nr_sections;
2791
2792         sec_start = header->feat_offset;
2793         lseek(fd, sec_start + sec_size, SEEK_SET);
2794
2795         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2796                 if (do_write_feat(&ff, feat, &p, evlist))
2797                         perf_header__clear_feat(header, feat);
2798         }
2799
2800         lseek(fd, sec_start, SEEK_SET);
2801         /*
2802          * may write more than needed due to dropped feature, but
2803          * this is okay, reader will skip the missing entries
2804          */
2805         err = do_write(&ff, feat_sec, sec_size);
2806         if (err < 0)
2807                 pr_debug("failed to write feature section\n");
2808         free(feat_sec);
2809         return err;
2810 }
2811
2812 int perf_header__write_pipe(int fd)
2813 {
2814         struct perf_pipe_file_header f_header;
2815         struct feat_fd ff;
2816         int err;
2817
2818         ff = (struct feat_fd){ .fd = fd };
2819
2820         f_header = (struct perf_pipe_file_header){
2821                 .magic     = PERF_MAGIC,
2822                 .size      = sizeof(f_header),
2823         };
2824
2825         err = do_write(&ff, &f_header, sizeof(f_header));
2826         if (err < 0) {
2827                 pr_debug("failed to write perf pipe header\n");
2828                 return err;
2829         }
2830
2831         return 0;
2832 }
2833
2834 int perf_session__write_header(struct perf_session *session,
2835                                struct perf_evlist *evlist,
2836                                int fd, bool at_exit)
2837 {
2838         struct perf_file_header f_header;
2839         struct perf_file_attr   f_attr;
2840         struct perf_header *header = &session->header;
2841         struct perf_evsel *evsel;
2842         struct feat_fd ff;
2843         u64 attr_offset;
2844         int err;
2845
2846         ff = (struct feat_fd){ .fd = fd};
2847         lseek(fd, sizeof(f_header), SEEK_SET);
2848
2849         evlist__for_each_entry(session->evlist, evsel) {
2850                 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2851                 err = do_write(&ff, evsel->id, evsel->ids * sizeof(u64));
2852                 if (err < 0) {
2853                         pr_debug("failed to write perf header\n");
2854                         return err;
2855                 }
2856         }
2857
2858         attr_offset = lseek(ff.fd, 0, SEEK_CUR);
2859
2860         evlist__for_each_entry(evlist, evsel) {
2861                 f_attr = (struct perf_file_attr){
2862                         .attr = evsel->attr,
2863                         .ids  = {
2864                                 .offset = evsel->id_offset,
2865                                 .size   = evsel->ids * sizeof(u64),
2866                         }
2867                 };
2868                 err = do_write(&ff, &f_attr, sizeof(f_attr));
2869                 if (err < 0) {
2870                         pr_debug("failed to write perf header attribute\n");
2871                         return err;
2872                 }
2873         }
2874
2875         if (!header->data_offset)
2876                 header->data_offset = lseek(fd, 0, SEEK_CUR);
2877         header->feat_offset = header->data_offset + header->data_size;
2878
2879         if (at_exit) {
2880                 err = perf_header__adds_write(header, evlist, fd);
2881                 if (err < 0)
2882                         return err;
2883         }
2884
2885         f_header = (struct perf_file_header){
2886                 .magic     = PERF_MAGIC,
2887                 .size      = sizeof(f_header),
2888                 .attr_size = sizeof(f_attr),
2889                 .attrs = {
2890                         .offset = attr_offset,
2891                         .size   = evlist->nr_entries * sizeof(f_attr),
2892                 },
2893                 .data = {
2894                         .offset = header->data_offset,
2895                         .size   = header->data_size,
2896                 },
2897                 /* event_types is ignored, store zeros */
2898         };
2899
2900         memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2901
2902         lseek(fd, 0, SEEK_SET);
2903         err = do_write(&ff, &f_header, sizeof(f_header));
2904         if (err < 0) {
2905                 pr_debug("failed to write perf header\n");
2906                 return err;
2907         }
2908         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2909
2910         return 0;
2911 }
2912
2913 static int perf_header__getbuffer64(struct perf_header *header,
2914                                     int fd, void *buf, size_t size)
2915 {
2916         if (readn(fd, buf, size) <= 0)
2917                 return -1;
2918
2919         if (header->needs_swap)
2920                 mem_bswap_64(buf, size);
2921
2922         return 0;
2923 }
2924
2925 int perf_header__process_sections(struct perf_header *header, int fd,
2926                                   void *data,
2927                                   int (*process)(struct perf_file_section *section,
2928                                                  struct perf_header *ph,
2929                                                  int feat, int fd, void *data))
2930 {
2931         struct perf_file_section *feat_sec, *sec;
2932         int nr_sections;
2933         int sec_size;
2934         int feat;
2935         int err;
2936
2937         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2938         if (!nr_sections)
2939                 return 0;
2940
2941         feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2942         if (!feat_sec)
2943                 return -1;
2944
2945         sec_size = sizeof(*feat_sec) * nr_sections;
2946
2947         lseek(fd, header->feat_offset, SEEK_SET);
2948
2949         err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2950         if (err < 0)
2951                 goto out_free;
2952
2953         for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2954                 err = process(sec++, header, feat, fd, data);
2955                 if (err < 0)
2956                         goto out_free;
2957         }
2958         err = 0;
2959 out_free:
2960         free(feat_sec);
2961         return err;
2962 }
2963
2964 static const int attr_file_abi_sizes[] = {
2965         [0] = PERF_ATTR_SIZE_VER0,
2966         [1] = PERF_ATTR_SIZE_VER1,
2967         [2] = PERF_ATTR_SIZE_VER2,
2968         [3] = PERF_ATTR_SIZE_VER3,
2969         [4] = PERF_ATTR_SIZE_VER4,
2970         0,
2971 };
2972
2973 /*
2974  * In the legacy file format, the magic number is not used to encode endianness.
2975  * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2976  * on ABI revisions, we need to try all combinations for all endianness to
2977  * detect the endianness.
2978  */
2979 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2980 {
2981         uint64_t ref_size, attr_size;
2982         int i;
2983
2984         for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2985                 ref_size = attr_file_abi_sizes[i]
2986                          + sizeof(struct perf_file_section);
2987                 if (hdr_sz != ref_size) {
2988                         attr_size = bswap_64(hdr_sz);
2989                         if (attr_size != ref_size)
2990                                 continue;
2991
2992                         ph->needs_swap = true;
2993                 }
2994                 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2995                          i,
2996                          ph->needs_swap);
2997                 return 0;
2998         }
2999         /* could not determine endianness */
3000         return -1;
3001 }
3002
3003 #define PERF_PIPE_HDR_VER0      16
3004
3005 static const size_t attr_pipe_abi_sizes[] = {
3006         [0] = PERF_PIPE_HDR_VER0,
3007         0,
3008 };
3009
3010 /*
3011  * In the legacy pipe format, there is an implicit assumption that endiannesss
3012  * between host recording the samples, and host parsing the samples is the
3013  * same. This is not always the case given that the pipe output may always be
3014  * redirected into a file and analyzed on a different machine with possibly a
3015  * different endianness and perf_event ABI revsions in the perf tool itself.
3016  */
3017 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
3018 {
3019         u64 attr_size;
3020         int i;
3021
3022         for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
3023                 if (hdr_sz != attr_pipe_abi_sizes[i]) {
3024                         attr_size = bswap_64(hdr_sz);
3025                         if (attr_size != hdr_sz)
3026                                 continue;
3027
3028                         ph->needs_swap = true;
3029                 }
3030                 pr_debug("Pipe ABI%d perf.data file detected\n", i);
3031                 return 0;
3032         }
3033         return -1;
3034 }
3035
3036 bool is_perf_magic(u64 magic)
3037 {
3038         if (!memcmp(&magic, __perf_magic1, sizeof(magic))
3039                 || magic == __perf_magic2
3040                 || magic == __perf_magic2_sw)
3041                 return true;
3042
3043         return false;
3044 }
3045
3046 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
3047                               bool is_pipe, struct perf_header *ph)
3048 {
3049         int ret;
3050
3051         /* check for legacy format */
3052         ret = memcmp(&magic, __perf_magic1, sizeof(magic));
3053         if (ret == 0) {
3054                 ph->version = PERF_HEADER_VERSION_1;
3055                 pr_debug("legacy perf.data format\n");
3056                 if (is_pipe)
3057                         return try_all_pipe_abis(hdr_sz, ph);
3058
3059                 return try_all_file_abis(hdr_sz, ph);
3060         }
3061         /*
3062          * the new magic number serves two purposes:
3063          * - unique number to identify actual perf.data files
3064          * - encode endianness of file
3065          */
3066         ph->version = PERF_HEADER_VERSION_2;
3067
3068         /* check magic number with one endianness */
3069         if (magic == __perf_magic2)
3070                 return 0;
3071
3072         /* check magic number with opposite endianness */
3073         if (magic != __perf_magic2_sw)
3074                 return -1;
3075
3076         ph->needs_swap = true;
3077
3078         return 0;
3079 }
3080
3081 int perf_file_header__read(struct perf_file_header *header,
3082                            struct perf_header *ph, int fd)
3083 {
3084         ssize_t ret;
3085
3086         lseek(fd, 0, SEEK_SET);
3087
3088         ret = readn(fd, header, sizeof(*header));
3089         if (ret <= 0)
3090                 return -1;
3091
3092         if (check_magic_endian(header->magic,
3093                                header->attr_size, false, ph) < 0) {
3094                 pr_debug("magic/endian check failed\n");
3095                 return -1;
3096         }
3097
3098         if (ph->needs_swap) {
3099                 mem_bswap_64(header, offsetof(struct perf_file_header,
3100                              adds_features));
3101         }
3102
3103         if (header->size != sizeof(*header)) {
3104                 /* Support the previous format */
3105                 if (header->size == offsetof(typeof(*header), adds_features))
3106                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
3107                 else
3108                         return -1;
3109         } else if (ph->needs_swap) {
3110                 /*
3111                  * feature bitmap is declared as an array of unsigned longs --
3112                  * not good since its size can differ between the host that
3113                  * generated the data file and the host analyzing the file.
3114                  *
3115                  * We need to handle endianness, but we don't know the size of
3116                  * the unsigned long where the file was generated. Take a best
3117                  * guess at determining it: try 64-bit swap first (ie., file
3118                  * created on a 64-bit host), and check if the hostname feature
3119                  * bit is set (this feature bit is forced on as of fbe96f2).
3120                  * If the bit is not, undo the 64-bit swap and try a 32-bit
3121                  * swap. If the hostname bit is still not set (e.g., older data
3122                  * file), punt and fallback to the original behavior --
3123                  * clearing all feature bits and setting buildid.
3124                  */
3125                 mem_bswap_64(&header->adds_features,
3126                             BITS_TO_U64(HEADER_FEAT_BITS));
3127
3128                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
3129                         /* unswap as u64 */
3130                         mem_bswap_64(&header->adds_features,
3131                                     BITS_TO_U64(HEADER_FEAT_BITS));
3132
3133                         /* unswap as u32 */
3134                         mem_bswap_32(&header->adds_features,
3135                                     BITS_TO_U32(HEADER_FEAT_BITS));
3136                 }
3137
3138                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
3139                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
3140                         set_bit(HEADER_BUILD_ID, header->adds_features);
3141                 }
3142         }
3143
3144         memcpy(&ph->adds_features, &header->adds_features,
3145                sizeof(ph->adds_features));
3146
3147         ph->data_offset  = header->data.offset;
3148         ph->data_size    = header->data.size;
3149         ph->feat_offset  = header->data.offset + header->data.size;
3150         return 0;
3151 }
3152
3153 static int perf_file_section__process(struct perf_file_section *section,
3154                                       struct perf_header *ph,
3155                                       int feat, int fd, void *data)
3156 {
3157         struct feat_fd fdd = {
3158                 .fd     = fd,
3159                 .ph     = ph,
3160                 .size   = section->size,
3161                 .offset = section->offset,
3162         };
3163
3164         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
3165                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
3166                           "%d, continuing...\n", section->offset, feat);
3167                 return 0;
3168         }
3169
3170         if (feat >= HEADER_LAST_FEATURE) {
3171                 pr_debug("unknown feature %d, continuing...\n", feat);
3172                 return 0;
3173         }
3174
3175         if (!feat_ops[feat].process)
3176                 return 0;
3177
3178         return feat_ops[feat].process(&fdd, data);
3179 }
3180
3181 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
3182                                        struct perf_header *ph, int fd,
3183                                        bool repipe)
3184 {
3185         struct feat_fd ff = {
3186                 .fd = STDOUT_FILENO,
3187                 .ph = ph,
3188         };
3189         ssize_t ret;
3190
3191         ret = readn(fd, header, sizeof(*header));
3192         if (ret <= 0)
3193                 return -1;
3194
3195         if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
3196                 pr_debug("endian/magic failed\n");
3197                 return -1;
3198         }
3199
3200         if (ph->needs_swap)
3201                 header->size = bswap_64(header->size);
3202
3203         if (repipe && do_write(&ff, header, sizeof(*header)) < 0)
3204                 return -1;
3205
3206         return 0;
3207 }
3208
3209 static int perf_header__read_pipe(struct perf_session *session)
3210 {
3211         struct perf_header *header = &session->header;
3212         struct perf_pipe_file_header f_header;
3213
3214         if (perf_file_header__read_pipe(&f_header, header,
3215                                         perf_data__fd(session->data),
3216                                         session->repipe) < 0) {
3217                 pr_debug("incompatible file format\n");
3218                 return -EINVAL;
3219         }
3220
3221         return 0;
3222 }
3223
3224 static int read_attr(int fd, struct perf_header *ph,
3225                      struct perf_file_attr *f_attr)
3226 {
3227         struct perf_event_attr *attr = &f_attr->attr;
3228         size_t sz, left;
3229         size_t our_sz = sizeof(f_attr->attr);
3230         ssize_t ret;
3231
3232         memset(f_attr, 0, sizeof(*f_attr));
3233
3234         /* read minimal guaranteed structure */
3235         ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
3236         if (ret <= 0) {
3237                 pr_debug("cannot read %d bytes of header attr\n",
3238                          PERF_ATTR_SIZE_VER0);
3239                 return -1;
3240         }
3241
3242         /* on file perf_event_attr size */
3243         sz = attr->size;
3244
3245         if (ph->needs_swap)
3246                 sz = bswap_32(sz);
3247
3248         if (sz == 0) {
3249                 /* assume ABI0 */
3250                 sz =  PERF_ATTR_SIZE_VER0;
3251         } else if (sz > our_sz) {
3252                 pr_debug("file uses a more recent and unsupported ABI"
3253                          " (%zu bytes extra)\n", sz - our_sz);
3254                 return -1;
3255         }
3256         /* what we have not yet read and that we know about */
3257         left = sz - PERF_ATTR_SIZE_VER0;
3258         if (left) {
3259                 void *ptr = attr;
3260                 ptr += PERF_ATTR_SIZE_VER0;
3261
3262                 ret = readn(fd, ptr, left);
3263         }
3264         /* read perf_file_section, ids are read in caller */
3265         ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
3266
3267         return ret <= 0 ? -1 : 0;
3268 }
3269
3270 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
3271                                                 struct tep_handle *pevent)
3272 {
3273         struct tep_event *event;
3274         char bf[128];
3275
3276         /* already prepared */
3277         if (evsel->tp_format)
3278                 return 0;
3279
3280         if (pevent == NULL) {
3281                 pr_debug("broken or missing trace data\n");
3282                 return -1;
3283         }
3284
3285         event = tep_find_event(pevent, evsel->attr.config);
3286         if (event == NULL) {
3287                 pr_debug("cannot find event format for %d\n", (int)evsel->attr.config);
3288                 return -1;
3289         }
3290
3291         if (!evsel->name) {
3292                 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
3293                 evsel->name = strdup(bf);
3294                 if (evsel->name == NULL)
3295                         return -1;
3296         }
3297
3298         evsel->tp_format = event;
3299         return 0;
3300 }
3301
3302 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
3303                                                   struct tep_handle *pevent)
3304 {
3305         struct perf_evsel *pos;
3306
3307         evlist__for_each_entry(evlist, pos) {
3308                 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
3309                     perf_evsel__prepare_tracepoint_event(pos, pevent))
3310                         return -1;
3311         }
3312
3313         return 0;
3314 }
3315
3316 int perf_session__read_header(struct perf_session *session)
3317 {
3318         struct perf_data *data = session->data;
3319         struct perf_header *header = &session->header;
3320         struct perf_file_header f_header;
3321         struct perf_file_attr   f_attr;
3322         u64                     f_id;
3323         int nr_attrs, nr_ids, i, j;
3324         int fd = perf_data__fd(data);
3325
3326         session->evlist = perf_evlist__new();
3327         if (session->evlist == NULL)
3328                 return -ENOMEM;
3329
3330         session->evlist->env = &header->env;
3331         session->machines.host.env = &header->env;
3332         if (perf_data__is_pipe(data))
3333                 return perf_header__read_pipe(session);
3334
3335         if (perf_file_header__read(&f_header, header, fd) < 0)
3336                 return -EINVAL;
3337
3338         /*
3339          * Sanity check that perf.data was written cleanly; data size is
3340          * initialized to 0 and updated only if the on_exit function is run.
3341          * If data size is still 0 then the file contains only partial
3342          * information.  Just warn user and process it as much as it can.
3343          */
3344         if (f_header.data.size == 0) {
3345                 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
3346                            "Was the 'perf record' command properly terminated?\n",
3347                            data->file.path);
3348         }
3349
3350         nr_attrs = f_header.attrs.size / f_header.attr_size;
3351         lseek(fd, f_header.attrs.offset, SEEK_SET);
3352
3353         for (i = 0; i < nr_attrs; i++) {
3354                 struct perf_evsel *evsel;
3355                 off_t tmp;
3356
3357                 if (read_attr(fd, header, &f_attr) < 0)
3358                         goto out_errno;
3359
3360                 if (header->needs_swap) {
3361                         f_attr.ids.size   = bswap_64(f_attr.ids.size);
3362                         f_attr.ids.offset = bswap_64(f_attr.ids.offset);
3363                         perf_event__attr_swap(&f_attr.attr);
3364                 }
3365
3366                 tmp = lseek(fd, 0, SEEK_CUR);
3367                 evsel = perf_evsel__new(&f_attr.attr);
3368
3369                 if (evsel == NULL)
3370                         goto out_delete_evlist;
3371
3372                 evsel->needs_swap = header->needs_swap;
3373                 /*
3374                  * Do it before so that if perf_evsel__alloc_id fails, this
3375                  * entry gets purged too at perf_evlist__delete().
3376                  */
3377                 perf_evlist__add(session->evlist, evsel);
3378
3379                 nr_ids = f_attr.ids.size / sizeof(u64);
3380                 /*
3381                  * We don't have the cpu and thread maps on the header, so
3382                  * for allocating the perf_sample_id table we fake 1 cpu and
3383                  * hattr->ids threads.
3384                  */
3385                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
3386                         goto out_delete_evlist;
3387
3388                 lseek(fd, f_attr.ids.offset, SEEK_SET);
3389
3390                 for (j = 0; j < nr_ids; j++) {
3391                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
3392                                 goto out_errno;
3393
3394                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
3395                 }
3396
3397                 lseek(fd, tmp, SEEK_SET);
3398         }
3399
3400         perf_header__process_sections(header, fd, &session->tevent,
3401                                       perf_file_section__process);
3402
3403         if (perf_evlist__prepare_tracepoint_events(session->evlist,
3404                                                    session->tevent.pevent))
3405                 goto out_delete_evlist;
3406
3407         return 0;
3408 out_errno:
3409         return -errno;
3410
3411 out_delete_evlist:
3412         perf_evlist__delete(session->evlist);
3413         session->evlist = NULL;
3414         return -ENOMEM;
3415 }
3416
3417 int perf_event__synthesize_attr(struct perf_tool *tool,
3418                                 struct perf_event_attr *attr, u32 ids, u64 *id,
3419                                 perf_event__handler_t process)
3420 {
3421         union perf_event *ev;
3422         size_t size;
3423         int err;
3424
3425         size = sizeof(struct perf_event_attr);
3426         size = PERF_ALIGN(size, sizeof(u64));
3427         size += sizeof(struct perf_event_header);
3428         size += ids * sizeof(u64);
3429
3430         ev = malloc(size);
3431
3432         if (ev == NULL)
3433                 return -ENOMEM;
3434
3435         ev->attr.attr = *attr;
3436         memcpy(ev->attr.id, id, ids * sizeof(u64));
3437
3438         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
3439         ev->attr.header.size = (u16)size;
3440
3441         if (ev->attr.header.size == size)
3442                 err = process(tool, ev, NULL, NULL);
3443         else
3444                 err = -E2BIG;
3445
3446         free(ev);
3447
3448         return err;
3449 }
3450
3451 int perf_event__synthesize_features(struct perf_tool *tool,
3452                                     struct perf_session *session,
3453                                     struct perf_evlist *evlist,
3454                                     perf_event__handler_t process)
3455 {
3456         struct perf_header *header = &session->header;
3457         struct feat_fd ff;
3458         struct feature_event *fe;
3459         size_t sz, sz_hdr;
3460         int feat, ret;
3461
3462         sz_hdr = sizeof(fe->header);
3463         sz = sizeof(union perf_event);
3464         /* get a nice alignment */
3465         sz = PERF_ALIGN(sz, page_size);
3466
3467         memset(&ff, 0, sizeof(ff));
3468
3469         ff.buf = malloc(sz);
3470         if (!ff.buf)
3471                 return -ENOMEM;
3472
3473         ff.size = sz - sz_hdr;
3474
3475         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
3476                 if (!feat_ops[feat].synthesize) {
3477                         pr_debug("No record header feature for header :%d\n", feat);
3478                         continue;
3479                 }
3480
3481                 ff.offset = sizeof(*fe);
3482
3483                 ret = feat_ops[feat].write(&ff, evlist);
3484                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
3485                         pr_debug("Error writing feature\n");
3486                         continue;
3487                 }
3488                 /* ff.buf may have changed due to realloc in do_write() */
3489                 fe = ff.buf;
3490                 memset(fe, 0, sizeof(*fe));
3491
3492                 fe->feat_id = feat;
3493                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
3494                 fe->header.size = ff.offset;
3495
3496                 ret = process(tool, ff.buf, NULL, NULL);
3497                 if (ret) {
3498                         free(ff.buf);
3499                         return ret;
3500                 }
3501         }
3502
3503         /* Send HEADER_LAST_FEATURE mark. */
3504         fe = ff.buf;
3505         fe->feat_id     = HEADER_LAST_FEATURE;
3506         fe->header.type = PERF_RECORD_HEADER_FEATURE;
3507         fe->header.size = sizeof(*fe);
3508
3509         ret = process(tool, ff.buf, NULL, NULL);
3510
3511         free(ff.buf);
3512         return ret;
3513 }
3514
3515 int perf_event__process_feature(struct perf_session *session,
3516                                 union perf_event *event)
3517 {
3518         struct perf_tool *tool = session->tool;
3519         struct feat_fd ff = { .fd = 0 };
3520         struct feature_event *fe = (struct feature_event *)event;
3521         int type = fe->header.type;
3522         u64 feat = fe->feat_id;
3523
3524         if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {
3525                 pr_warning("invalid record type %d in pipe-mode\n", type);
3526                 return 0;
3527         }
3528         if (feat == HEADER_RESERVED || feat >= HEADER_LAST_FEATURE) {
3529                 pr_warning("invalid record type %d in pipe-mode\n", type);
3530                 return -1;
3531         }
3532
3533         if (!feat_ops[feat].process)
3534                 return 0;
3535
3536         ff.buf  = (void *)fe->data;
3537         ff.size = event->header.size - sizeof(event->header);
3538         ff.ph = &session->header;
3539
3540         if (feat_ops[feat].process(&ff, NULL))
3541                 return -1;
3542
3543         if (!feat_ops[feat].print || !tool->show_feat_hdr)
3544                 return 0;
3545
3546         if (!feat_ops[feat].full_only ||
3547             tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {
3548                 feat_ops[feat].print(&ff, stdout);
3549         } else {
3550                 fprintf(stdout, "# %s info available, use -I to display\n",
3551                         feat_ops[feat].name);
3552         }
3553
3554         return 0;
3555 }
3556
3557 static struct event_update_event *
3558 event_update_event__new(size_t size, u64 type, u64 id)
3559 {
3560         struct event_update_event *ev;
3561
3562         size += sizeof(*ev);
3563         size  = PERF_ALIGN(size, sizeof(u64));
3564
3565         ev = zalloc(size);
3566         if (ev) {
3567                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
3568                 ev->header.size = (u16)size;
3569                 ev->type = type;
3570                 ev->id = id;
3571         }
3572         return ev;
3573 }
3574
3575 int
3576 perf_event__synthesize_event_update_unit(struct perf_tool *tool,
3577                                          struct perf_evsel *evsel,
3578                                          perf_event__handler_t process)
3579 {
3580         struct event_update_event *ev;
3581         size_t size = strlen(evsel->unit);
3582         int err;
3583
3584         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
3585         if (ev == NULL)
3586                 return -ENOMEM;
3587
3588         strlcpy(ev->data, evsel->unit, size + 1);
3589         err = process(tool, (union perf_event *)ev, NULL, NULL);
3590         free(ev);
3591         return err;
3592 }
3593
3594 int
3595 perf_event__synthesize_event_update_scale(struct perf_tool *tool,
3596                                           struct perf_evsel *evsel,
3597                                           perf_event__handler_t process)
3598 {
3599         struct event_update_event *ev;
3600         struct event_update_event_scale *ev_data;
3601         int err;
3602
3603         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->id[0]);
3604         if (ev == NULL)
3605                 return -ENOMEM;
3606
3607         ev_data = (struct event_update_event_scale *) ev->data;
3608         ev_data->scale = evsel->scale;
3609         err = process(tool, (union perf_event*) ev, NULL, NULL);
3610         free(ev);
3611         return err;
3612 }
3613
3614 int
3615 perf_event__synthesize_event_update_name(struct perf_tool *tool,
3616                                          struct perf_evsel *evsel,
3617                                          perf_event__handler_t process)
3618 {
3619         struct event_update_event *ev;
3620         size_t len = strlen(evsel->name);
3621         int err;
3622
3623         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->id[0]);
3624         if (ev == NULL)
3625                 return -ENOMEM;
3626
3627         strlcpy(ev->data, evsel->name, len + 1);
3628         err = process(tool, (union perf_event*) ev, NULL, NULL);
3629         free(ev);
3630         return err;
3631 }
3632
3633 int
3634 perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
3635                                         struct perf_evsel *evsel,
3636                                         perf_event__handler_t process)
3637 {
3638         size_t size = sizeof(struct event_update_event);
3639         struct event_update_event *ev;
3640         int max, err;
3641         u16 type;
3642
3643         if (!evsel->own_cpus)
3644                 return 0;
3645
3646         ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
3647         if (!ev)
3648                 return -ENOMEM;
3649
3650         ev->header.type = PERF_RECORD_EVENT_UPDATE;
3651         ev->header.size = (u16)size;
3652         ev->type = PERF_EVENT_UPDATE__CPUS;
3653         ev->id   = evsel->id[0];
3654
3655         cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
3656                                  evsel->own_cpus,
3657                                  type, max);
3658
3659         err = process(tool, (union perf_event*) ev, NULL, NULL);
3660         free(ev);
3661         return err;
3662 }
3663
3664 size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
3665 {
3666         struct event_update_event *ev = &event->event_update;
3667         struct event_update_event_scale *ev_scale;
3668         struct event_update_event_cpus *ev_cpus;
3669         struct cpu_map *map;
3670         size_t ret;
3671
3672         ret = fprintf(fp, "\n... id:    %" PRIu64 "\n", ev->id);
3673
3674         switch (ev->type) {
3675         case PERF_EVENT_UPDATE__SCALE:
3676                 ev_scale = (struct event_update_event_scale *) ev->data;
3677                 ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
3678                 break;
3679         case PERF_EVENT_UPDATE__UNIT:
3680                 ret += fprintf(fp, "... unit:  %s\n", ev->data);
3681                 break;
3682         case PERF_EVENT_UPDATE__NAME:
3683                 ret += fprintf(fp, "... name:  %s\n", ev->data);
3684                 break;
3685         case PERF_EVENT_UPDATE__CPUS:
3686                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3687                 ret += fprintf(fp, "... ");
3688
3689                 map = cpu_map__new_data(&ev_cpus->cpus);
3690                 if (map)
3691                         ret += cpu_map__fprintf(map, fp);
3692                 else
3693                         ret += fprintf(fp, "failed to get cpus\n");
3694                 break;
3695         default:
3696                 ret += fprintf(fp, "... unknown type\n");
3697                 break;
3698         }
3699
3700         return ret;
3701 }
3702
3703 int perf_event__synthesize_attrs(struct perf_tool *tool,
3704                                  struct perf_evlist *evlist,
3705                                  perf_event__handler_t process)
3706 {
3707         struct perf_evsel *evsel;
3708         int err = 0;
3709
3710         evlist__for_each_entry(evlist, evsel) {
3711                 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
3712                                                   evsel->id, process);
3713                 if (err) {
3714                         pr_debug("failed to create perf header attribute\n");
3715                         return err;
3716                 }
3717         }
3718
3719         return err;
3720 }
3721
3722 static bool has_unit(struct perf_evsel *counter)
3723 {
3724         return counter->unit && *counter->unit;
3725 }
3726
3727 static bool has_scale(struct perf_evsel *counter)
3728 {
3729         return counter->scale != 1;
3730 }
3731
3732 int perf_event__synthesize_extra_attr(struct perf_tool *tool,
3733                                       struct perf_evlist *evsel_list,
3734                                       perf_event__handler_t process,
3735                                       bool is_pipe)
3736 {
3737         struct perf_evsel *counter;
3738         int err;
3739
3740         /*
3741          * Synthesize other events stuff not carried within
3742          * attr event - unit, scale, name
3743          */
3744         evlist__for_each_entry(evsel_list, counter) {
3745                 if (!counter->supported)
3746                         continue;
3747
3748                 /*
3749                  * Synthesize unit and scale only if it's defined.
3750                  */
3751                 if (has_unit(counter)) {
3752                         err = perf_event__synthesize_event_update_unit(tool, counter, process);
3753                         if (err < 0) {
3754                                 pr_err("Couldn't synthesize evsel unit.\n");
3755                                 return err;
3756                         }
3757                 }
3758
3759                 if (has_scale(counter)) {
3760                         err = perf_event__synthesize_event_update_scale(tool, counter, process);
3761                         if (err < 0) {
3762                                 pr_err("Couldn't synthesize evsel counter.\n");
3763                                 return err;
3764                         }
3765                 }
3766
3767                 if (counter->own_cpus) {
3768                         err = perf_event__synthesize_event_update_cpus(tool, counter, process);
3769                         if (err < 0) {
3770                                 pr_err("Couldn't synthesize evsel cpus.\n");
3771                                 return err;
3772                         }
3773                 }
3774
3775                 /*
3776                  * Name is needed only for pipe output,
3777                  * perf.data carries event names.
3778                  */
3779                 if (is_pipe) {
3780                         err = perf_event__synthesize_event_update_name(tool, counter, process);
3781                         if (err < 0) {
3782                                 pr_err("Couldn't synthesize evsel name.\n");
3783                                 return err;
3784                         }
3785                 }
3786         }
3787         return 0;
3788 }
3789
3790 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
3791                              union perf_event *event,
3792                              struct perf_evlist **pevlist)
3793 {
3794         u32 i, ids, n_ids;
3795         struct perf_evsel *evsel;
3796         struct perf_evlist *evlist = *pevlist;
3797
3798         if (evlist == NULL) {
3799                 *pevlist = evlist = perf_evlist__new();
3800                 if (evlist == NULL)
3801                         return -ENOMEM;
3802         }
3803
3804         evsel = perf_evsel__new(&event->attr.attr);
3805         if (evsel == NULL)
3806                 return -ENOMEM;
3807
3808         perf_evlist__add(evlist, evsel);
3809
3810         ids = event->header.size;
3811         ids -= (void *)&event->attr.id - (void *)event;
3812         n_ids = ids / sizeof(u64);
3813         /*
3814          * We don't have the cpu and thread maps on the header, so
3815          * for allocating the perf_sample_id table we fake 1 cpu and
3816          * hattr->ids threads.
3817          */
3818         if (perf_evsel__alloc_id(evsel, 1, n_ids))
3819                 return -ENOMEM;
3820
3821         for (i = 0; i < n_ids; i++) {
3822                 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3823         }
3824
3825         return 0;
3826 }
3827
3828 int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
3829                                      union perf_event *event,
3830                                      struct perf_evlist **pevlist)
3831 {
3832         struct event_update_event *ev = &event->event_update;
3833         struct event_update_event_scale *ev_scale;
3834         struct event_update_event_cpus *ev_cpus;
3835         struct perf_evlist *evlist;
3836         struct perf_evsel *evsel;
3837         struct cpu_map *map;
3838
3839         if (!pevlist || *pevlist == NULL)
3840                 return -EINVAL;
3841
3842         evlist = *pevlist;
3843
3844         evsel = perf_evlist__id2evsel(evlist, ev->id);
3845         if (evsel == NULL)
3846                 return -EINVAL;
3847
3848         switch (ev->type) {
3849         case PERF_EVENT_UPDATE__UNIT:
3850                 evsel->unit = strdup(ev->data);
3851                 break;
3852         case PERF_EVENT_UPDATE__NAME:
3853                 evsel->name = strdup(ev->data);
3854                 break;
3855         case PERF_EVENT_UPDATE__SCALE:
3856                 ev_scale = (struct event_update_event_scale *) ev->data;
3857                 evsel->scale = ev_scale->scale;
3858                 break;
3859         case PERF_EVENT_UPDATE__CPUS:
3860                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3861
3862                 map = cpu_map__new_data(&ev_cpus->cpus);
3863                 if (map)
3864                         evsel->own_cpus = map;
3865                 else
3866                         pr_err("failed to get event_update cpus\n");
3867         default:
3868                 break;
3869         }
3870
3871         return 0;
3872 }
3873
3874 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3875                                         struct perf_evlist *evlist,
3876                                         perf_event__handler_t process)
3877 {
3878         union perf_event ev;
3879         struct tracing_data *tdata;
3880         ssize_t size = 0, aligned_size = 0, padding;
3881         struct feat_fd ff;
3882         int err __maybe_unused = 0;
3883
3884         /*
3885          * We are going to store the size of the data followed
3886          * by the data contents. Since the fd descriptor is a pipe,
3887          * we cannot seek back to store the size of the data once
3888          * we know it. Instead we:
3889          *
3890          * - write the tracing data to the temp file
3891          * - get/write the data size to pipe
3892          * - write the tracing data from the temp file
3893          *   to the pipe
3894          */
3895         tdata = tracing_data_get(&evlist->entries, fd, true);
3896         if (!tdata)
3897                 return -1;
3898
3899         memset(&ev, 0, sizeof(ev));
3900
3901         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3902         size = tdata->size;
3903         aligned_size = PERF_ALIGN(size, sizeof(u64));
3904         padding = aligned_size - size;
3905         ev.tracing_data.header.size = sizeof(ev.tracing_data);
3906         ev.tracing_data.size = aligned_size;
3907
3908         process(tool, &ev, NULL, NULL);
3909
3910         /*
3911          * The put function will copy all the tracing data
3912          * stored in temp file to the pipe.
3913          */
3914         tracing_data_put(tdata);
3915
3916         ff = (struct feat_fd){ .fd = fd };
3917         if (write_padded(&ff, NULL, 0, padding))
3918                 return -1;
3919
3920         return aligned_size;
3921 }
3922
3923 int perf_event__process_tracing_data(struct perf_session *session,
3924                                      union perf_event *event)
3925 {
3926         ssize_t size_read, padding, size = event->tracing_data.size;
3927         int fd = perf_data__fd(session->data);
3928         off_t offset = lseek(fd, 0, SEEK_CUR);
3929         char buf[BUFSIZ];
3930
3931         /* setup for reading amidst mmap */
3932         lseek(fd, offset + sizeof(struct tracing_data_event),
3933               SEEK_SET);
3934
3935         size_read = trace_report(fd, &session->tevent,
3936                                  session->repipe);
3937         padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3938
3939         if (readn(fd, buf, padding) < 0) {
3940                 pr_err("%s: reading input file", __func__);
3941                 return -1;
3942         }
3943         if (session->repipe) {
3944                 int retw = write(STDOUT_FILENO, buf, padding);
3945                 if (retw <= 0 || retw != padding) {
3946                         pr_err("%s: repiping tracing data padding", __func__);
3947                         return -1;
3948                 }
3949         }
3950
3951         if (size_read + padding != size) {
3952                 pr_err("%s: tracing data size mismatch", __func__);
3953                 return -1;
3954         }
3955
3956         perf_evlist__prepare_tracepoint_events(session->evlist,
3957                                                session->tevent.pevent);
3958
3959         return size_read + padding;
3960 }
3961
3962 int perf_event__synthesize_build_id(struct perf_tool *tool,
3963                                     struct dso *pos, u16 misc,
3964                                     perf_event__handler_t process,
3965                                     struct machine *machine)
3966 {
3967         union perf_event ev;
3968         size_t len;
3969         int err = 0;
3970
3971         if (!pos->hit)
3972                 return err;
3973
3974         memset(&ev, 0, sizeof(ev));
3975
3976         len = pos->long_name_len + 1;
3977         len = PERF_ALIGN(len, NAME_ALIGN);
3978         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3979         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3980         ev.build_id.header.misc = misc;
3981         ev.build_id.pid = machine->pid;
3982         ev.build_id.header.size = sizeof(ev.build_id) + len;
3983         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3984
3985         err = process(tool, &ev, NULL, machine);
3986
3987         return err;
3988 }
3989
3990 int perf_event__process_build_id(struct perf_session *session,
3991                                  union perf_event *event)
3992 {
3993         __event_process_build_id(&event->build_id,
3994                                  event->build_id.filename,
3995                                  session);
3996         return 0;
3997 }