tools/perf/util/header.c

   1 #include "util.h"
   2 #include <sys/types.h>
   3 #include <byteswap.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <linux/list.h>
   8 #include <linux/kernel.h>
   9 #include <linux/bitops.h>
  10 #include <sys/utsname.h>
  11
  12 #include "evlist.h"
  13 #include "evsel.h"
  14 #include "header.h"
  15 #include "../perf.h"
  16 #include "trace-event.h"
  17 #include "session.h"
  18 #include "symbol.h"
  19 #include "debug.h"
  20 #include "cpumap.h"
  21 #include "pmu.h"
  22 #include "vdso.h"
  23 #include "strbuf.h"
  24 #include "build-id.h"
  25 #include "data.h"
  26 #include <api/fs/fs.h>
  27 #include "asm/bug.h"
  28
  29 /*
  30  * magic2 = "PERFILE2"
  31  * must be a numerical value to let the endianness
  32  * determine the memory layout. That way we are able
  33  * to detect endianness when reading the perf.data file
  34  * back.
  35  *
  36  * we check for legacy (PERFFILE) format.
  37  */
  38 static const char *__perf_magic1 = "PERFFILE";
  39 static const u64 __perf_magic2    = 0x32454c4946524550ULL;
  40 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
  41
  42 #define PERF_MAGIC      __perf_magic2
  43
  44 struct perf_file_attr {
  45         struct perf_event_attr  attr;
  46         struct perf_file_section        ids;
  47 };
  48
  49 void perf_header__set_feat(struct perf_header *header, int feat)
  50 {
  51         set_bit(feat, header->adds_features);
  52 }
  53
  54 void perf_header__clear_feat(struct perf_header *header, int feat)
  55 {
  56         clear_bit(feat, header->adds_features);
  57 }
  58
  59 bool perf_header__has_feat(const struct perf_header *header, int feat)
  60 {
  61         return test_bit(feat, header->adds_features);
  62 }
  63
  64 static int do_write(int fd, const void *buf, size_t size)
  65 {
  66         while (size) {
  67                 int ret = write(fd, buf, size);
  68
  69                 if (ret < 0)
  70                         return -errno;
  71
  72                 size -= ret;
  73                 buf += ret;
  74         }
  75
  76         return 0;
  77 }
  78
  79 int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
  80 {
  81         static const char zero_buf[NAME_ALIGN];
  82         int err = do_write(fd, bf, count);
  83
  84         if (!err)
  85                 err = do_write(fd, zero_buf, count_aligned - count);
  86
  87         return err;
  88 }
  89
  90 #define string_size(str)                                                \
  91         (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
  92
  93 static int do_write_string(int fd, const char *str)
  94 {
  95         u32 len, olen;
  96         int ret;
  97
  98         olen = strlen(str) + 1;
  99         len = PERF_ALIGN(olen, NAME_ALIGN);
 100
 101         /* write len, incl. \0 */
 102         ret = do_write(fd, &len, sizeof(len));
 103         if (ret < 0)
 104                 return ret;
 105
 106         return write_padded(fd, str, olen, len);
 107 }
 108
 109 static char *do_read_string(int fd, struct perf_header *ph)
 110 {
 111         ssize_t sz, ret;
 112         u32 len;
 113         char *buf;
 114
 115         sz = readn(fd, &len, sizeof(len));
 116         if (sz < (ssize_t)sizeof(len))
 117                 return NULL;
 118
 119         if (ph->needs_swap)
 120                 len = bswap_32(len);
 121
 122         buf = malloc(len);
 123         if (!buf)
 124                 return NULL;
 125
 126         ret = readn(fd, buf, len);
 127         if (ret == (ssize_t)len) {
 128                 /*
 129                  * strings are padded by zeroes
 130                  * thus the actual strlen of buf
 131                  * may be less than len
 132                  */
 133                 return buf;
 134         }
 135
 136         free(buf);
 137         return NULL;
 138 }
 139
 140 static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
 141                             struct perf_evlist *evlist)
 142 {
 143         return read_tracing_data(fd, &evlist->entries);
 144 }
 145
 146
 147 static int write_build_id(int fd, struct perf_header *h,
 148                           struct perf_evlist *evlist __maybe_unused)
 149 {
 150         struct perf_session *session;
 151         int err;
 152
 153         session = container_of(h, struct perf_session, header);
 154
 155         if (!perf_session__read_build_ids(session, true))
 156                 return -1;
 157
 158         err = perf_session__write_buildid_table(session, fd);
 159         if (err < 0) {
 160                 pr_debug("failed to write buildid table\n");
 161                 return err;
 162         }
 163         perf_session__cache_build_ids(session);
 164
 165         return 0;
 166 }
 167
 168 static int write_hostname(int fd, struct perf_header *h __maybe_unused,
 169                           struct perf_evlist *evlist __maybe_unused)
 170 {
 171         struct utsname uts;
 172         int ret;
 173
 174         ret = uname(&uts);
 175         if (ret < 0)
 176                 return -1;
 177
 178         return do_write_string(fd, uts.nodename);
 179 }
 180
 181 static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
 182                            struct perf_evlist *evlist __maybe_unused)
 183 {
 184         struct utsname uts;
 185         int ret;
 186
 187         ret = uname(&uts);
 188         if (ret < 0)
 189                 return -1;
 190
 191         return do_write_string(fd, uts.release);
 192 }
 193
 194 static int write_arch(int fd, struct perf_header *h __maybe_unused,
 195                       struct perf_evlist *evlist __maybe_unused)
 196 {
 197         struct utsname uts;
 198         int ret;
 199
 200         ret = uname(&uts);
 201         if (ret < 0)
 202                 return -1;
 203
 204         return do_write_string(fd, uts.machine);
 205 }
 206
 207 static int write_version(int fd, struct perf_header *h __maybe_unused,
 208                          struct perf_evlist *evlist __maybe_unused)
 209 {
 210         return do_write_string(fd, perf_version_string);
 211 }
 212
 213 static int __write_cpudesc(int fd, const char *cpuinfo_proc)
 214 {
 215         FILE *file;
 216         char *buf = NULL;
 217         char *s, *p;
 218         const char *search = cpuinfo_proc;
 219         size_t len = 0;
 220         int ret = -1;
 221
 222         if (!search)
 223                 return -1;
 224
 225         file = fopen("/proc/cpuinfo", "r");
 226         if (!file)
 227                 return -1;
 228
 229         while (getline(&buf, &len, file) > 0) {
 230                 ret = strncmp(buf, search, strlen(search));
 231                 if (!ret)
 232                         break;
 233         }
 234
 235         if (ret) {
 236                 ret = -1;
 237                 goto done;
 238         }
 239
 240         s = buf;
 241
 242         p = strchr(buf, ':');
 243         if (p && *(p+1) == ' ' && *(p+2))
 244                 s = p + 2;
 245         p = strchr(s, '\n');
 246         if (p)
 247                 *p = '\0';
 248
 249         /* squash extra space characters (branding string) */
 250         p = s;
 251         while (*p) {
 252                 if (isspace(*p)) {
 253                         char *r = p + 1;
 254                         char *q = r;
 255                         *p = ' ';
 256                         while (*q && isspace(*q))
 257                                 q++;
 258                         if (q != (p+1))
 259                                 while ((*r++ = *q++));
 260                 }
 261                 p++;
 262         }
 263         ret = do_write_string(fd, s);
 264 done:
 265         free(buf);
 266         fclose(file);
 267         return ret;
 268 }
 269
 270 static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
 271                        struct perf_evlist *evlist __maybe_unused)
 272 {
 273 #ifndef CPUINFO_PROC
 274 #define CPUINFO_PROC {"model name", }
 275 #endif
 276         const char *cpuinfo_procs[] = CPUINFO_PROC;
 277         unsigned int i;
 278
 279         for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
 280                 int ret;
 281                 ret = __write_cpudesc(fd, cpuinfo_procs[i]);
 282                 if (ret >= 0)
 283                         return ret;
 284         }
 285         return -1;
 286 }
 287
 288
 289 static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
 290                         struct perf_evlist *evlist __maybe_unused)
 291 {
 292         long nr;
 293         u32 nrc, nra;
 294         int ret;
 295
 296         nr = sysconf(_SC_NPROCESSORS_CONF);
 297         if (nr < 0)
 298                 return -1;
 299
 300         nrc = (u32)(nr & UINT_MAX);
 301
 302         nr = sysconf(_SC_NPROCESSORS_ONLN);
 303         if (nr < 0)
 304                 return -1;
 305
 306         nra = (u32)(nr & UINT_MAX);
 307
 308         ret = do_write(fd, &nrc, sizeof(nrc));
 309         if (ret < 0)
 310                 return ret;
 311
 312         return do_write(fd, &nra, sizeof(nra));
 313 }
 314
 315 static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
 316                             struct perf_evlist *evlist)
 317 {
 318         struct perf_evsel *evsel;
 319         u32 nre, nri, sz;
 320         int ret;
 321
 322         nre = evlist->nr_entries;
 323
 324         /*
 325          * write number of events
 326          */
 327         ret = do_write(fd, &nre, sizeof(nre));
 328         if (ret < 0)
 329                 return ret;
 330
 331         /*
 332          * size of perf_event_attr struct
 333          */
 334         sz = (u32)sizeof(evsel->attr);
 335         ret = do_write(fd, &sz, sizeof(sz));
 336         if (ret < 0)
 337                 return ret;
 338
 339         evlist__for_each_entry(evlist, evsel) {
 340                 ret = do_write(fd, &evsel->attr, sz);
 341                 if (ret < 0)
 342                         return ret;
 343                 /*
 344                  * write number of unique id per event
 345                  * there is one id per instance of an event
 346                  *
 347                  * copy into an nri to be independent of the
 348                  * type of ids,
 349                  */
 350                 nri = evsel->ids;
 351                 ret = do_write(fd, &nri, sizeof(nri));
 352                 if (ret < 0)
 353                         return ret;
 354
 355                 /*
 356                  * write event string as passed on cmdline
 357                  */
 358                 ret = do_write_string(fd, perf_evsel__name(evsel));
 359                 if (ret < 0)
 360                         return ret;
 361                 /*
 362                  * write unique ids for this event
 363                  */
 364                 ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
 365                 if (ret < 0)
 366                         return ret;
 367         }
 368         return 0;
 369 }
 370
 371 static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 372                          struct perf_evlist *evlist __maybe_unused)
 373 {
 374         char buf[MAXPATHLEN];
 375         char proc[32];
 376         u32 n;
 377         int i, ret;
 378
 379         /*
 380          * actual atual path to perf binary
 381          */
 382         sprintf(proc, "/proc/%d/exe", getpid());
 383         ret = readlink(proc, buf, sizeof(buf));
 384         if (ret <= 0)
 385                 return -1;
 386
 387         /* readlink() does not add null termination */
 388         buf[ret] = '\0';
 389
 390         /* account for binary path */
 391         n = perf_env.nr_cmdline + 1;
 392
 393         ret = do_write(fd, &n, sizeof(n));
 394         if (ret < 0)
 395                 return ret;
 396
 397         ret = do_write_string(fd, buf);
 398         if (ret < 0)
 399                 return ret;
 400
 401         for (i = 0 ; i < perf_env.nr_cmdline; i++) {
 402                 ret = do_write_string(fd, perf_env.cmdline_argv[i]);
 403                 if (ret < 0)
 404                         return ret;
 405         }
 406         return 0;
 407 }
 408
 409 #define CORE_SIB_FMT \
 410         "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
 411 #define THRD_SIB_FMT \
 412         "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
 413
 414 struct cpu_topo {
 415         u32 cpu_nr;
 416         u32 core_sib;
 417         u32 thread_sib;
 418         char **core_siblings;
 419         char **thread_siblings;
 420 };
 421
 422 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
 423 {
 424         FILE *fp;
 425         char filename[MAXPATHLEN];
 426         char *buf = NULL, *p;
 427         size_t len = 0;
 428         ssize_t sret;
 429         u32 i = 0;
 430         int ret = -1;
 431
 432         sprintf(filename, CORE_SIB_FMT, cpu);
 433         fp = fopen(filename, "r");
 434         if (!fp)
 435                 goto try_threads;
 436
 437         sret = getline(&buf, &len, fp);
 438         fclose(fp);
 439         if (sret <= 0)
 440                 goto try_threads;
 441
 442         p = strchr(buf, '\n');
 443         if (p)
 444                 *p = '\0';
 445
 446         for (i = 0; i < tp->core_sib; i++) {
 447                 if (!strcmp(buf, tp->core_siblings[i]))
 448                         break;
 449         }
 450         if (i == tp->core_sib) {
 451                 tp->core_siblings[i] = buf;
 452                 tp->core_sib++;
 453                 buf = NULL;
 454                 len = 0;
 455         }
 456         ret = 0;
 457
 458 try_threads:
 459         sprintf(filename, THRD_SIB_FMT, cpu);
 460         fp = fopen(filename, "r");
 461         if (!fp)
 462                 goto done;
 463
 464         if (getline(&buf, &len, fp) <= 0)
 465                 goto done;
 466
 467         p = strchr(buf, '\n');
 468         if (p)
 469                 *p = '\0';
 470
 471         for (i = 0; i < tp->thread_sib; i++) {
 472                 if (!strcmp(buf, tp->thread_siblings[i]))
 473                         break;
 474         }
 475         if (i == tp->thread_sib) {
 476                 tp->thread_siblings[i] = buf;
 477                 tp->thread_sib++;
 478                 buf = NULL;
 479         }
 480         ret = 0;
 481 done:
 482         if(fp)
 483                 fclose(fp);
 484         free(buf);
 485         return ret;
 486 }
 487
 488 static void free_cpu_topo(struct cpu_topo *tp)
 489 {
 490         u32 i;
 491
 492         if (!tp)
 493                 return;
 494
 495         for (i = 0 ; i < tp->core_sib; i++)
 496                 zfree(&tp->core_siblings[i]);
 497
 498         for (i = 0 ; i < tp->thread_sib; i++)
 499                 zfree(&tp->thread_siblings[i]);
 500
 501         free(tp);
 502 }
 503
 504 static struct cpu_topo *build_cpu_topology(void)
 505 {
 506         struct cpu_topo *tp;
 507         void *addr;
 508         u32 nr, i;
 509         size_t sz;
 510         long ncpus;
 511         int ret = -1;
 512
 513         ncpus = sysconf(_SC_NPROCESSORS_CONF);
 514         if (ncpus < 0)
 515                 return NULL;
 516
 517         nr = (u32)(ncpus & UINT_MAX);
 518
 519         sz = nr * sizeof(char *);
 520
 521         addr = calloc(1, sizeof(*tp) + 2 * sz);
 522         if (!addr)
 523                 return NULL;
 524
 525         tp = addr;
 526         tp->cpu_nr = nr;
 527         addr += sizeof(*tp);
 528         tp->core_siblings = addr;
 529         addr += sz;
 530         tp->thread_siblings = addr;
 531
 532         for (i = 0; i < nr; i++) {
 533                 ret = build_cpu_topo(tp, i);
 534                 if (ret < 0)
 535                         break;
 536         }
 537         if (ret) {
 538                 free_cpu_topo(tp);
 539                 tp = NULL;
 540         }
 541         return tp;
 542 }
 543
 544 static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
 545                           struct perf_evlist *evlist __maybe_unused)
 546 {
 547         struct cpu_topo *tp;
 548         u32 i;
 549         int ret, j;
 550
 551         tp = build_cpu_topology();
 552         if (!tp)
 553                 return -1;
 554
 555         ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
 556         if (ret < 0)
 557                 goto done;
 558
 559         for (i = 0; i < tp->core_sib; i++) {
 560                 ret = do_write_string(fd, tp->core_siblings[i]);
 561                 if (ret < 0)
 562                         goto done;
 563         }
 564         ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
 565         if (ret < 0)
 566                 goto done;
 567
 568         for (i = 0; i < tp->thread_sib; i++) {
 569                 ret = do_write_string(fd, tp->thread_siblings[i]);
 570                 if (ret < 0)
 571                         break;
 572         }
 573
 574         ret = perf_env__read_cpu_topology_map(&perf_env);
 575         if (ret < 0)
 576                 goto done;
 577
 578         for (j = 0; j < perf_env.nr_cpus_avail; j++) {
 579                 ret = do_write(fd, &perf_env.cpu[j].core_id,
 580                                sizeof(perf_env.cpu[j].core_id));
 581                 if (ret < 0)
 582                         return ret;
 583                 ret = do_write(fd, &perf_env.cpu[j].socket_id,
 584                                sizeof(perf_env.cpu[j].socket_id));
 585                 if (ret < 0)
 586                         return ret;
 587         }
 588 done:
 589         free_cpu_topo(tp);
 590         return ret;
 591 }
 592
 593
 594
 595 static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
 596                           struct perf_evlist *evlist __maybe_unused)
 597 {
 598         char *buf = NULL;
 599         FILE *fp;
 600         size_t len = 0;
 601         int ret = -1, n;
 602         uint64_t mem;
 603
 604         fp = fopen("/proc/meminfo", "r");
 605         if (!fp)
 606                 return -1;
 607
 608         while (getline(&buf, &len, fp) > 0) {
 609                 ret = strncmp(buf, "MemTotal:", 9);
 610                 if (!ret)
 611                         break;
 612         }
 613         if (!ret) {
 614                 n = sscanf(buf, "%*s %"PRIu64, &mem);
 615                 if (n == 1)
 616                         ret = do_write(fd, &mem, sizeof(mem));
 617         } else
 618                 ret = -1;
 619         free(buf);
 620         fclose(fp);
 621         return ret;
 622 }
 623
 624 static int write_topo_node(int fd, int node)
 625 {
 626         char str[MAXPATHLEN];
 627         char field[32];
 628         char *buf = NULL, *p;
 629         size_t len = 0;
 630         FILE *fp;
 631         u64 mem_total, mem_free, mem;
 632         int ret = -1;
 633
 634         sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
 635         fp = fopen(str, "r");
 636         if (!fp)
 637                 return -1;
 638
 639         while (getline(&buf, &len, fp) > 0) {
 640                 /* skip over invalid lines */
 641                 if (!strchr(buf, ':'))
 642                         continue;
 643                 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
 644                         goto done;
 645                 if (!strcmp(field, "MemTotal:"))
 646                         mem_total = mem;
 647                 if (!strcmp(field, "MemFree:"))
 648                         mem_free = mem;
 649         }
 650
 651         fclose(fp);
 652         fp = NULL;
 653
 654         ret = do_write(fd, &mem_total, sizeof(u64));
 655         if (ret)
 656                 goto done;
 657
 658         ret = do_write(fd, &mem_free, sizeof(u64));
 659         if (ret)
 660                 goto done;
 661
 662         ret = -1;
 663         sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
 664
 665         fp = fopen(str, "r");
 666         if (!fp)
 667                 goto done;
 668
 669         if (getline(&buf, &len, fp) <= 0)
 670                 goto done;
 671
 672         p = strchr(buf, '\n');
 673         if (p)
 674                 *p = '\0';
 675
 676         ret = do_write_string(fd, buf);
 677 done:
 678         free(buf);
 679         if (fp)
 680                 fclose(fp);
 681         return ret;
 682 }
 683
 684 static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
 685                           struct perf_evlist *evlist __maybe_unused)
 686 {
 687         char *buf = NULL;
 688         size_t len = 0;
 689         FILE *fp;
 690         struct cpu_map *node_map = NULL;
 691         char *c;
 692         u32 nr, i, j;
 693         int ret = -1;
 694
 695         fp = fopen("/sys/devices/system/node/online", "r");
 696         if (!fp)
 697                 return -1;
 698
 699         if (getline(&buf, &len, fp) <= 0)
 700                 goto done;
 701
 702         c = strchr(buf, '\n');
 703         if (c)
 704                 *c = '\0';
 705
 706         node_map = cpu_map__new(buf);
 707         if (!node_map)
 708                 goto done;
 709
 710         nr = (u32)node_map->nr;
 711
 712         ret = do_write(fd, &nr, sizeof(nr));
 713         if (ret < 0)
 714                 goto done;
 715
 716         for (i = 0; i < nr; i++) {
 717                 j = (u32)node_map->map[i];
 718                 ret = do_write(fd, &j, sizeof(j));
 719                 if (ret < 0)
 720                         break;
 721
 722                 ret = write_topo_node(fd, i);
 723                 if (ret < 0)
 724                         break;
 725         }
 726 done:
 727         free(buf);
 728         fclose(fp);
 729         cpu_map__put(node_map);
 730         return ret;
 731 }
 732
 733 /*
 734  * File format:
 735  *
 736  * struct pmu_mappings {
 737  *      u32     pmu_num;
 738  *      struct pmu_map {
 739  *              u32     type;
 740  *              char    name[];
 741  *      }[pmu_num];
 742  * };
 743  */
 744
 745 static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
 746                               struct perf_evlist *evlist __maybe_unused)
 747 {
 748         struct perf_pmu *pmu = NULL;
 749         off_t offset = lseek(fd, 0, SEEK_CUR);
 750         __u32 pmu_num = 0;
 751         int ret;
 752
 753         /* write real pmu_num later */
 754         ret = do_write(fd, &pmu_num, sizeof(pmu_num));
 755         if (ret < 0)
 756                 return ret;
 757
 758         while ((pmu = perf_pmu__scan(pmu))) {
 759                 if (!pmu->name)
 760                         continue;
 761                 pmu_num++;
 762
 763                 ret = do_write(fd, &pmu->type, sizeof(pmu->type));
 764                 if (ret < 0)
 765                         return ret;
 766
 767                 ret = do_write_string(fd, pmu->name);
 768                 if (ret < 0)
 769                         return ret;
 770         }
 771
 772         if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
 773                 /* discard all */
 774                 lseek(fd, offset, SEEK_SET);
 775                 return -1;
 776         }
 777
 778         return 0;
 779 }
 780
 781 /*
 782  * File format:
 783  *
 784  * struct group_descs {
 785  *      u32     nr_groups;
 786  *      struct group_desc {
 787  *              char    name[];
 788  *              u32     leader_idx;
 789  *              u32     nr_members;
 790  *      }[nr_groups];
 791  * };
 792  */
 793 static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
 794                             struct perf_evlist *evlist)
 795 {
 796         u32 nr_groups = evlist->nr_groups;
 797         struct perf_evsel *evsel;
 798         int ret;
 799
 800         ret = do_write(fd, &nr_groups, sizeof(nr_groups));
 801         if (ret < 0)
 802                 return ret;
 803
 804         evlist__for_each_entry(evlist, evsel) {
 805                 if (perf_evsel__is_group_leader(evsel) &&
 806                     evsel->nr_members > 1) {
 807                         const char *name = evsel->group_name ?: "{anon_group}";
 808                         u32 leader_idx = evsel->idx;
 809                         u32 nr_members = evsel->nr_members;
 810
 811                         ret = do_write_string(fd, name);
 812                         if (ret < 0)
 813                                 return ret;
 814
 815                         ret = do_write(fd, &leader_idx, sizeof(leader_idx));
 816                         if (ret < 0)
 817                                 return ret;
 818
 819                         ret = do_write(fd, &nr_members, sizeof(nr_members));
 820                         if (ret < 0)
 821                                 return ret;
 822                 }
 823         }
 824         return 0;
 825 }
 826
 827 /*
 828  * default get_cpuid(): nothing gets recorded
 829  * actual implementation must be in arch/$(ARCH)/util/header.c
 830  */
 831 int __attribute__ ((weak)) get_cpuid(char *buffer __maybe_unused,
 832                                      size_t sz __maybe_unused)
 833 {
 834         return -1;
 835 }
 836
 837 static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
 838                        struct perf_evlist *evlist __maybe_unused)
 839 {
 840         char buffer[64];
 841         int ret;
 842
 843         ret = get_cpuid(buffer, sizeof(buffer));
 844         if (!ret)
 845                 goto write_it;
 846
 847         return -1;
 848 write_it:
 849         return do_write_string(fd, buffer);
 850 }
 851
 852 static int write_branch_stack(int fd __maybe_unused,
 853                               struct perf_header *h __maybe_unused,
 854                        struct perf_evlist *evlist __maybe_unused)
 855 {
 856         return 0;
 857 }
 858
 859 static int write_auxtrace(int fd, struct perf_header *h,
 860                           struct perf_evlist *evlist __maybe_unused)
 861 {
 862         struct perf_session *session;
 863         int err;
 864
 865         session = container_of(h, struct perf_session, header);
 866
 867         err = auxtrace_index__write(fd, &session->auxtrace_index);
 868         if (err < 0)
 869                 pr_err("Failed to write auxtrace index\n");
 870         return err;
 871 }
 872
 873 static int cpu_cache_level__sort(const void *a, const void *b)
 874 {
 875         struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
 876         struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
 877
 878         return cache_a->level - cache_b->level;
 879 }
 880
 881 static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
 882 {
 883         if (a->level != b->level)
 884                 return false;
 885
 886         if (a->line_size != b->line_size)
 887                 return false;
 888
 889         if (a->sets != b->sets)
 890                 return false;
 891
 892         if (a->ways != b->ways)
 893                 return false;
 894
 895         if (strcmp(a->type, b->type))
 896                 return false;
 897
 898         if (strcmp(a->size, b->size))
 899                 return false;
 900
 901         if (strcmp(a->map, b->map))
 902                 return false;
 903
 904         return true;
 905 }
 906
 907 static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
 908 {
 909         char path[PATH_MAX], file[PATH_MAX];
 910         struct stat st;
 911         size_t len;
 912
 913         scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
 914         scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
 915
 916         if (stat(file, &st))
 917                 return 1;
 918
 919         scnprintf(file, PATH_MAX, "%s/level", path);
 920         if (sysfs__read_int(file, (int *) &cache->level))
 921                 return -1;
 922
 923         scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
 924         if (sysfs__read_int(file, (int *) &cache->line_size))
 925                 return -1;
 926
 927         scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
 928         if (sysfs__read_int(file, (int *) &cache->sets))
 929                 return -1;
 930
 931         scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
 932         if (sysfs__read_int(file, (int *) &cache->ways))
 933                 return -1;
 934
 935         scnprintf(file, PATH_MAX, "%s/type", path);
 936         if (sysfs__read_str(file, &cache->type, &len))
 937                 return -1;
 938
 939         cache->type[len] = 0;
 940         cache->type = rtrim(cache->type);
 941
 942         scnprintf(file, PATH_MAX, "%s/size", path);
 943         if (sysfs__read_str(file, &cache->size, &len)) {
 944                 free(cache->type);
 945                 return -1;
 946         }
 947
 948         cache->size[len] = 0;
 949         cache->size = rtrim(cache->size);
 950
 951         scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
 952         if (sysfs__read_str(file, &cache->map, &len)) {
 953                 free(cache->map);
 954                 free(cache->type);
 955                 return -1;
 956         }
 957
 958         cache->map[len] = 0;
 959         cache->map = rtrim(cache->map);
 960         return 0;
 961 }
 962
 963 static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
 964 {
 965         fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
 966 }
 967
 968 static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
 969 {
 970         u32 i, cnt = 0;
 971         long ncpus;
 972         u32 nr, cpu;
 973         u16 level;
 974
 975         ncpus = sysconf(_SC_NPROCESSORS_CONF);
 976         if (ncpus < 0)
 977                 return -1;
 978
 979         nr = (u32)(ncpus & UINT_MAX);
 980
 981         for (cpu = 0; cpu < nr; cpu++) {
 982                 for (level = 0; level < 10; level++) {
 983                         struct cpu_cache_level c;
 984                         int err;
 985
 986                         err = cpu_cache_level__read(&c, cpu, level);
 987                         if (err < 0)
 988                                 return err;
 989
 990                         if (err == 1)
 991                                 break;
 992
 993                         for (i = 0; i < cnt; i++) {
 994                                 if (cpu_cache_level__cmp(&c, &caches[i]))
 995                                         break;
 996                         }
 997
 998                         if (i == cnt)
 999                                 caches[cnt++] = c;
1000                         else
1001                                 cpu_cache_level__free(&c);
1002
1003                         if (WARN_ONCE(cnt == size, "way too many cpu caches.."))
1004                                 goto out;
1005                 }
1006         }
1007  out:
1008         *cntp = cnt;
1009         return 0;
1010 }
1011
1012 #define MAX_CACHES 2000
1013
1014 static int write_cache(int fd, struct perf_header *h __maybe_unused,
1015                           struct perf_evlist *evlist __maybe_unused)
1016 {
1017         struct cpu_cache_level caches[MAX_CACHES];
1018         u32 cnt = 0, i, version = 1;
1019         int ret;
1020
1021         ret = build_caches(caches, MAX_CACHES, &cnt);
1022         if (ret)
1023                 goto out;
1024
1025         qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1026
1027         ret = do_write(fd, &version, sizeof(u32));
1028         if (ret < 0)
1029                 goto out;
1030
1031         ret = do_write(fd, &cnt, sizeof(u32));
1032         if (ret < 0)
1033                 goto out;
1034
1035         for (i = 0; i < cnt; i++) {
1036                 struct cpu_cache_level *c = &caches[i];
1037
1038                 #define _W(v)                                   \
1039                         ret = do_write(fd, &c->v, sizeof(u32)); \
1040                         if (ret < 0)                            \
1041                                 goto out;
1042
1043                 _W(level)
1044                 _W(line_size)
1045                 _W(sets)
1046                 _W(ways)
1047                 #undef _W
1048
1049                 #define _W(v)                                           \
1050                         ret = do_write_string(fd, (const char *) c->v); \
1051                         if (ret < 0)                                    \
1052                                 goto out;
1053
1054                 _W(type)
1055                 _W(size)
1056                 _W(map)
1057                 #undef _W
1058         }
1059
1060 out:
1061         for (i = 0; i < cnt; i++)
1062                 cpu_cache_level__free(&caches[i]);
1063         return ret;
1064 }
1065
1066 static int write_stat(int fd __maybe_unused,
1067                       struct perf_header *h __maybe_unused,
1068                       struct perf_evlist *evlist __maybe_unused)
1069 {
1070         return 0;
1071 }
1072
1073 static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
1074                            FILE *fp)
1075 {
1076         fprintf(fp, "# hostname : %s\n", ph->env.hostname);
1077 }
1078
1079 static void print_osrelease(struct perf_header *ph, int fd __maybe_unused,
1080                             FILE *fp)
1081 {
1082         fprintf(fp, "# os release : %s\n", ph->env.os_release);
1083 }
1084
1085 static void print_arch(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1086 {
1087         fprintf(fp, "# arch : %s\n", ph->env.arch);
1088 }
1089
1090 static void print_cpudesc(struct perf_header *ph, int fd __maybe_unused,
1091                           FILE *fp)
1092 {
1093         fprintf(fp, "# cpudesc : %s\n", ph->env.cpu_desc);
1094 }
1095
1096 static void print_nrcpus(struct perf_header *ph, int fd __maybe_unused,
1097                          FILE *fp)
1098 {
1099         fprintf(fp, "# nrcpus online : %u\n", ph->env.nr_cpus_online);
1100         fprintf(fp, "# nrcpus avail : %u\n", ph->env.nr_cpus_avail);
1101 }
1102
1103 static void print_version(struct perf_header *ph, int fd __maybe_unused,
1104                           FILE *fp)
1105 {
1106         fprintf(fp, "# perf version : %s\n", ph->env.version);
1107 }
1108
1109 static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
1110                           FILE *fp)
1111 {
1112         int nr, i;
1113
1114         nr = ph->env.nr_cmdline;
1115
1116         fprintf(fp, "# cmdline : ");
1117
1118         for (i = 0; i < nr; i++)
1119                 fprintf(fp, "%s ", ph->env.cmdline_argv[i]);
1120         fputc('\n', fp);
1121 }
1122
1123 static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
1124                                FILE *fp)
1125 {
1126         int nr, i;
1127         char *str;
1128         int cpu_nr = ph->env.nr_cpus_online;
1129
1130         nr = ph->env.nr_sibling_cores;
1131         str = ph->env.sibling_cores;
1132
1133         for (i = 0; i < nr; i++) {
1134                 fprintf(fp, "# sibling cores   : %s\n", str);
1135                 str += strlen(str) + 1;
1136         }
1137
1138         nr = ph->env.nr_sibling_threads;
1139         str = ph->env.sibling_threads;
1140
1141         for (i = 0; i < nr; i++) {
1142                 fprintf(fp, "# sibling threads : %s\n", str);
1143                 str += strlen(str) + 1;
1144         }
1145
1146         if (ph->env.cpu != NULL) {
1147                 for (i = 0; i < cpu_nr; i++)
1148                         fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
1149                                 ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
1150         } else
1151                 fprintf(fp, "# Core ID and Socket ID information is not available\n");
1152 }
1153
1154 static void free_event_desc(struct perf_evsel *events)
1155 {
1156         struct perf_evsel *evsel;
1157
1158         if (!events)
1159                 return;
1160
1161         for (evsel = events; evsel->attr.size; evsel++) {
1162                 zfree(&evsel->name);
1163                 zfree(&evsel->id);
1164         }
1165
1166         free(events);
1167 }
1168
1169 static struct perf_evsel *
1170 read_event_desc(struct perf_header *ph, int fd)
1171 {
1172         struct perf_evsel *evsel, *events = NULL;
1173         u64 *id;
1174         void *buf = NULL;
1175         u32 nre, sz, nr, i, j;
1176         ssize_t ret;
1177         size_t msz;
1178
1179         /* number of events */
1180         ret = readn(fd, &nre, sizeof(nre));
1181         if (ret != (ssize_t)sizeof(nre))
1182                 goto error;
1183
1184         if (ph->needs_swap)
1185                 nre = bswap_32(nre);
1186
1187         ret = readn(fd, &sz, sizeof(sz));
1188         if (ret != (ssize_t)sizeof(sz))
1189                 goto error;
1190
1191         if (ph->needs_swap)
1192                 sz = bswap_32(sz);
1193
1194         /* buffer to hold on file attr struct */
1195         buf = malloc(sz);
1196         if (!buf)
1197                 goto error;
1198
1199         /* the last event terminates with evsel->attr.size == 0: */
1200         events = calloc(nre + 1, sizeof(*events));
1201         if (!events)
1202                 goto error;
1203
1204         msz = sizeof(evsel->attr);
1205         if (sz < msz)
1206                 msz = sz;
1207
1208         for (i = 0, evsel = events; i < nre; evsel++, i++) {
1209                 evsel->idx = i;
1210
1211                 /*
1212                  * must read entire on-file attr struct to
1213                  * sync up with layout.
1214                  */
1215                 ret = readn(fd, buf, sz);
1216                 if (ret != (ssize_t)sz)
1217                         goto error;
1218
1219                 if (ph->needs_swap)
1220                         perf_event__attr_swap(buf);
1221
1222                 memcpy(&evsel->attr, buf, msz);
1223
1224                 ret = readn(fd, &nr, sizeof(nr));
1225                 if (ret != (ssize_t)sizeof(nr))
1226                         goto error;
1227
1228                 if (ph->needs_swap) {
1229                         nr = bswap_32(nr);
1230                         evsel->needs_swap = true;
1231                 }
1232
1233                 evsel->name = do_read_string(fd, ph);
1234
1235                 if (!nr)
1236                         continue;
1237
1238                 id = calloc(nr, sizeof(*id));
1239                 if (!id)
1240                         goto error;
1241                 evsel->ids = nr;
1242                 evsel->id = id;
1243
1244                 for (j = 0 ; j < nr; j++) {
1245                         ret = readn(fd, id, sizeof(*id));
1246                         if (ret != (ssize_t)sizeof(*id))
1247                                 goto error;
1248                         if (ph->needs_swap)
1249                                 *id = bswap_64(*id);
1250                         id++;
1251                 }
1252         }
1253 out:
1254         free(buf);
1255         return events;
1256 error:
1257         free_event_desc(events);
1258         events = NULL;
1259         goto out;
1260 }
1261
1262 static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1263                                 void *priv __attribute__((unused)))
1264 {
1265         return fprintf(fp, ", %s = %s", name, val);
1266 }
1267
1268 static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1269 {
1270         struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
1271         u32 j;
1272         u64 *id;
1273
1274         if (!events) {
1275                 fprintf(fp, "# event desc: not available or unable to read\n");
1276                 return;
1277         }
1278
1279         for (evsel = events; evsel->attr.size; evsel++) {
1280                 fprintf(fp, "# event : name = %s, ", evsel->name);
1281
1282                 if (evsel->ids) {
1283                         fprintf(fp, ", id = {");
1284                         for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1285                                 if (j)
1286                                         fputc(',', fp);
1287                                 fprintf(fp, " %"PRIu64, *id);
1288                         }
1289                         fprintf(fp, " }");
1290                 }
1291
1292                 perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1293
1294                 fputc('\n', fp);
1295         }
1296
1297         free_event_desc(events);
1298 }
1299
1300 static void print_total_mem(struct perf_header *ph, int fd __maybe_unused,
1301                             FILE *fp)
1302 {
1303         fprintf(fp, "# total memory : %Lu kB\n", ph->env.total_mem);
1304 }
1305
1306 static void print_numa_topology(struct perf_header *ph, int fd __maybe_unused,
1307                                 FILE *fp)
1308 {
1309         int i;
1310         struct numa_node *n;
1311
1312         for (i = 0; i < ph->env.nr_numa_nodes; i++) {
1313                 n = &ph->env.numa_nodes[i];
1314
1315                 fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
1316                             " free = %"PRIu64" kB\n",
1317                         n->node, n->mem_total, n->mem_free);
1318
1319                 fprintf(fp, "# node%u cpu list : ", n->node);
1320                 cpu_map__fprintf(n->map, fp);
1321         }
1322 }
1323
1324 static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1325 {
1326         fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
1327 }
1328
1329 static void print_branch_stack(struct perf_header *ph __maybe_unused,
1330                                int fd __maybe_unused, FILE *fp)
1331 {
1332         fprintf(fp, "# contains samples with branch stack\n");
1333 }
1334
1335 static void print_auxtrace(struct perf_header *ph __maybe_unused,
1336                            int fd __maybe_unused, FILE *fp)
1337 {
1338         fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1339 }
1340
1341 static void print_stat(struct perf_header *ph __maybe_unused,
1342                        int fd __maybe_unused, FILE *fp)
1343 {
1344         fprintf(fp, "# contains stat data\n");
1345 }
1346
1347 static void print_cache(struct perf_header *ph __maybe_unused,
1348                         int fd __maybe_unused, FILE *fp __maybe_unused)
1349 {
1350         int i;
1351
1352         fprintf(fp, "# CPU cache info:\n");
1353         for (i = 0; i < ph->env.caches_cnt; i++) {
1354                 fprintf(fp, "#  ");
1355                 cpu_cache_level__fprintf(fp, &ph->env.caches[i]);
1356         }
1357 }
1358
1359 static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
1360                                FILE *fp)
1361 {
1362         const char *delimiter = "# pmu mappings: ";
1363         char *str, *tmp;
1364         u32 pmu_num;
1365         u32 type;
1366
1367         pmu_num = ph->env.nr_pmu_mappings;
1368         if (!pmu_num) {
1369                 fprintf(fp, "# pmu mappings: not available\n");
1370                 return;
1371         }
1372
1373         str = ph->env.pmu_mappings;
1374
1375         while (pmu_num) {
1376                 type = strtoul(str, &tmp, 0);
1377                 if (*tmp != ':')
1378                         goto error;
1379
1380                 str = tmp + 1;
1381                 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1382
1383                 delimiter = ", ";
1384                 str += strlen(str) + 1;
1385                 pmu_num--;
1386         }
1387
1388         fprintf(fp, "\n");
1389
1390         if (!pmu_num)
1391                 return;
1392 error:
1393         fprintf(fp, "# pmu mappings: unable to read\n");
1394 }
1395
1396 static void print_group_desc(struct perf_header *ph, int fd __maybe_unused,
1397                              FILE *fp)
1398 {
1399         struct perf_session *session;
1400         struct perf_evsel *evsel;
1401         u32 nr = 0;
1402
1403         session = container_of(ph, struct perf_session, header);
1404
1405         evlist__for_each_entry(session->evlist, evsel) {
1406                 if (perf_evsel__is_group_leader(evsel) &&
1407                     evsel->nr_members > 1) {
1408                         fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1409                                 perf_evsel__name(evsel));
1410
1411                         nr = evsel->nr_members - 1;
1412                 } else if (nr) {
1413                         fprintf(fp, ",%s", perf_evsel__name(evsel));
1414
1415                         if (--nr == 0)
1416                                 fprintf(fp, "}\n");
1417                 }
1418         }
1419 }
1420
1421 static int __event_process_build_id(struct build_id_event *bev,
1422                                     char *filename,
1423                                     struct perf_session *session)
1424 {
1425         int err = -1;
1426         struct machine *machine;
1427         u16 cpumode;
1428         struct dso *dso;
1429         enum dso_kernel_type dso_type;
1430
1431         machine = perf_session__findnew_machine(session, bev->pid);
1432         if (!machine)
1433                 goto out;
1434
1435         cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1436
1437         switch (cpumode) {
1438         case PERF_RECORD_MISC_KERNEL:
1439                 dso_type = DSO_TYPE_KERNEL;
1440                 break;
1441         case PERF_RECORD_MISC_GUEST_KERNEL:
1442                 dso_type = DSO_TYPE_GUEST_KERNEL;
1443                 break;
1444         case PERF_RECORD_MISC_USER:
1445         case PERF_RECORD_MISC_GUEST_USER:
1446                 dso_type = DSO_TYPE_USER;
1447                 break;
1448         default:
1449                 goto out;
1450         }
1451
1452         dso = machine__findnew_dso(machine, filename);
1453         if (dso != NULL) {
1454                 char sbuild_id[SBUILD_ID_SIZE];
1455
1456                 dso__set_build_id(dso, &bev->build_id);
1457
1458                 if (!is_kernel_module(filename, cpumode))
1459                         dso->kernel = dso_type;
1460
1461                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1462                                   sbuild_id);
1463                 pr_debug("build id event received for %s: %s\n",
1464                          dso->long_name, sbuild_id);
1465                 dso__put(dso);
1466         }
1467
1468         err = 0;
1469 out:
1470         return err;
1471 }
1472
1473 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1474                                                  int input, u64 offset, u64 size)
1475 {
1476         struct perf_session *session = container_of(header, struct perf_session, header);
1477         struct {
1478                 struct perf_event_header   header;
1479                 u8                         build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1480                 char                       filename[0];
1481         } old_bev;
1482         struct build_id_event bev;
1483         char filename[PATH_MAX];
1484         u64 limit = offset + size;
1485
1486         while (offset < limit) {
1487                 ssize_t len;
1488
1489                 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1490                         return -1;
1491
1492                 if (header->needs_swap)
1493                         perf_event_header__bswap(&old_bev.header);
1494
1495                 len = old_bev.header.size - sizeof(old_bev);
1496                 if (readn(input, filename, len) != len)
1497                         return -1;
1498
1499                 bev.header = old_bev.header;
1500
1501                 /*
1502                  * As the pid is the missing value, we need to fill
1503                  * it properly. The header.misc value give us nice hint.
1504                  */
1505                 bev.pid = HOST_KERNEL_ID;
1506                 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1507                     bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1508                         bev.pid = DEFAULT_GUEST_KERNEL_ID;
1509
1510                 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1511                 __event_process_build_id(&bev, filename, session);
1512
1513                 offset += bev.header.size;
1514         }
1515
1516         return 0;
1517 }
1518
1519 static int perf_header__read_build_ids(struct perf_header *header,
1520                                        int input, u64 offset, u64 size)
1521 {
1522         struct perf_session *session = container_of(header, struct perf_session, header);
1523         struct build_id_event bev;
1524         char filename[PATH_MAX];
1525         u64 limit = offset + size, orig_offset = offset;
1526         int err = -1;
1527
1528         while (offset < limit) {
1529                 ssize_t len;
1530
1531                 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1532                         goto out;
1533
1534                 if (header->needs_swap)
1535                         perf_event_header__bswap(&bev.header);
1536
1537                 len = bev.header.size - sizeof(bev);
1538                 if (readn(input, filename, len) != len)
1539                         goto out;
1540                 /*
1541                  * The a1645ce1 changeset:
1542                  *
1543                  * "perf: 'perf kvm' tool for monitoring guest performance from host"
1544                  *
1545                  * Added a field to struct build_id_event that broke the file
1546                  * format.
1547                  *
1548                  * Since the kernel build-id is the first entry, process the
1549                  * table using the old format if the well known
1550                  * '[kernel.kallsyms]' string for the kernel build-id has the
1551                  * first 4 characters chopped off (where the pid_t sits).
1552                  */
1553                 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1554                         if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1555                                 return -1;
1556                         return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1557                 }
1558
1559                 __event_process_build_id(&bev, filename, session);
1560
1561                 offset += bev.header.size;
1562         }
1563         err = 0;
1564 out:
1565         return err;
1566 }
1567
1568 static int process_tracing_data(struct perf_file_section *section __maybe_unused,
1569                                 struct perf_header *ph __maybe_unused,
1570                                 int fd, void *data)
1571 {
1572         ssize_t ret = trace_report(fd, data, false);
1573         return ret < 0 ? -1 : 0;
1574 }
1575
1576 static int process_build_id(struct perf_file_section *section,
1577                             struct perf_header *ph, int fd,
1578                             void *data __maybe_unused)
1579 {
1580         if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1581                 pr_debug("Failed to read buildids, continuing...\n");
1582         return 0;
1583 }
1584
1585 static int process_hostname(struct perf_file_section *section __maybe_unused,
1586                             struct perf_header *ph, int fd,
1587                             void *data __maybe_unused)
1588 {
1589         ph->env.hostname = do_read_string(fd, ph);
1590         return ph->env.hostname ? 0 : -ENOMEM;
1591 }
1592
1593 static int process_osrelease(struct perf_file_section *section __maybe_unused,
1594                              struct perf_header *ph, int fd,
1595                              void *data __maybe_unused)
1596 {
1597         ph->env.os_release = do_read_string(fd, ph);
1598         return ph->env.os_release ? 0 : -ENOMEM;
1599 }
1600
1601 static int process_version(struct perf_file_section *section __maybe_unused,
1602                            struct perf_header *ph, int fd,
1603                            void *data __maybe_unused)
1604 {
1605         ph->env.version = do_read_string(fd, ph);
1606         return ph->env.version ? 0 : -ENOMEM;
1607 }
1608
1609 static int process_arch(struct perf_file_section *section __maybe_unused,
1610                         struct perf_header *ph, int fd,
1611                         void *data __maybe_unused)
1612 {
1613         ph->env.arch = do_read_string(fd, ph);
1614         return ph->env.arch ? 0 : -ENOMEM;
1615 }
1616
1617 static int process_nrcpus(struct perf_file_section *section __maybe_unused,
1618                           struct perf_header *ph, int fd,
1619                           void *data __maybe_unused)
1620 {
1621         ssize_t ret;
1622         u32 nr;
1623
1624         ret = readn(fd, &nr, sizeof(nr));
1625         if (ret != sizeof(nr))
1626                 return -1;
1627
1628         if (ph->needs_swap)
1629                 nr = bswap_32(nr);
1630
1631         ph->env.nr_cpus_avail = nr;
1632
1633         ret = readn(fd, &nr, sizeof(nr));
1634         if (ret != sizeof(nr))
1635                 return -1;
1636
1637         if (ph->needs_swap)
1638                 nr = bswap_32(nr);
1639
1640         ph->env.nr_cpus_online = nr;
1641         return 0;
1642 }
1643
1644 static int process_cpudesc(struct perf_file_section *section __maybe_unused,
1645                            struct perf_header *ph, int fd,
1646                            void *data __maybe_unused)
1647 {
1648         ph->env.cpu_desc = do_read_string(fd, ph);
1649         return ph->env.cpu_desc ? 0 : -ENOMEM;
1650 }
1651
1652 static int process_cpuid(struct perf_file_section *section __maybe_unused,
1653                          struct perf_header *ph,  int fd,
1654                          void *data __maybe_unused)
1655 {
1656         ph->env.cpuid = do_read_string(fd, ph);
1657         return ph->env.cpuid ? 0 : -ENOMEM;
1658 }
1659
1660 static int process_total_mem(struct perf_file_section *section __maybe_unused,
1661                              struct perf_header *ph, int fd,
1662                              void *data __maybe_unused)
1663 {
1664         uint64_t mem;
1665         ssize_t ret;
1666
1667         ret = readn(fd, &mem, sizeof(mem));
1668         if (ret != sizeof(mem))
1669                 return -1;
1670
1671         if (ph->needs_swap)
1672                 mem = bswap_64(mem);
1673
1674         ph->env.total_mem = mem;
1675         return 0;
1676 }
1677
1678 static struct perf_evsel *
1679 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
1680 {
1681         struct perf_evsel *evsel;
1682
1683         evlist__for_each_entry(evlist, evsel) {
1684                 if (evsel->idx == idx)
1685                         return evsel;
1686         }
1687
1688         return NULL;
1689 }
1690
1691 static void
1692 perf_evlist__set_event_name(struct perf_evlist *evlist,
1693                             struct perf_evsel *event)
1694 {
1695         struct perf_evsel *evsel;
1696
1697         if (!event->name)
1698                 return;
1699
1700         evsel = perf_evlist__find_by_index(evlist, event->idx);
1701         if (!evsel)
1702                 return;
1703
1704         if (evsel->name)
1705                 return;
1706
1707         evsel->name = strdup(event->name);
1708 }
1709
1710 static int
1711 process_event_desc(struct perf_file_section *section __maybe_unused,
1712                    struct perf_header *header, int fd,
1713                    void *data __maybe_unused)
1714 {
1715         struct perf_session *session;
1716         struct perf_evsel *evsel, *events = read_event_desc(header, fd);
1717
1718         if (!events)
1719                 return 0;
1720
1721         session = container_of(header, struct perf_session, header);
1722         for (evsel = events; evsel->attr.size; evsel++)
1723                 perf_evlist__set_event_name(session->evlist, evsel);
1724
1725         free_event_desc(events);
1726
1727         return 0;
1728 }
1729
1730 static int process_cmdline(struct perf_file_section *section,
1731                            struct perf_header *ph, int fd,
1732                            void *data __maybe_unused)
1733 {
1734         ssize_t ret;
1735         char *str, *cmdline = NULL, **argv = NULL;
1736         u32 nr, i, len = 0;
1737
1738         ret = readn(fd, &nr, sizeof(nr));
1739         if (ret != sizeof(nr))
1740                 return -1;
1741
1742         if (ph->needs_swap)
1743                 nr = bswap_32(nr);
1744
1745         ph->env.nr_cmdline = nr;
1746
1747         cmdline = zalloc(section->size + nr + 1);
1748         if (!cmdline)
1749                 return -1;
1750
1751         argv = zalloc(sizeof(char *) * (nr + 1));
1752         if (!argv)
1753                 goto error;
1754
1755         for (i = 0; i < nr; i++) {
1756                 str = do_read_string(fd, ph);
1757                 if (!str)
1758                         goto error;
1759
1760                 argv[i] = cmdline + len;
1761                 memcpy(argv[i], str, strlen(str) + 1);
1762                 len += strlen(str) + 1;
1763                 free(str);
1764         }
1765         ph->env.cmdline = cmdline;
1766         ph->env.cmdline_argv = (const char **) argv;
1767         return 0;
1768
1769 error:
1770         free(argv);
1771         free(cmdline);
1772         return -1;
1773 }
1774
1775 static int process_cpu_topology(struct perf_file_section *section,
1776                                 struct perf_header *ph, int fd,
1777                                 void *data __maybe_unused)
1778 {
1779         ssize_t ret;
1780         u32 nr, i;
1781         char *str;
1782         struct strbuf sb;
1783         int cpu_nr = ph->env.nr_cpus_online;
1784         u64 size = 0;
1785
1786         ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
1787         if (!ph->env.cpu)
1788                 return -1;
1789
1790         ret = readn(fd, &nr, sizeof(nr));
1791         if (ret != sizeof(nr))
1792                 goto free_cpu;
1793
1794         if (ph->needs_swap)
1795                 nr = bswap_32(nr);
1796
1797         ph->env.nr_sibling_cores = nr;
1798         size += sizeof(u32);
1799         if (strbuf_init(&sb, 128) < 0)
1800                 goto free_cpu;
1801
1802         for (i = 0; i < nr; i++) {
1803                 str = do_read_string(fd, ph);
1804                 if (!str)
1805                         goto error;
1806
1807                 /* include a NULL character at the end */
1808                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
1809                         goto error;
1810                 size += string_size(str);
1811                 free(str);
1812         }
1813         ph->env.sibling_cores = strbuf_detach(&sb, NULL);
1814
1815         ret = readn(fd, &nr, sizeof(nr));
1816         if (ret != sizeof(nr))
1817                 return -1;
1818
1819         if (ph->needs_swap)
1820                 nr = bswap_32(nr);
1821
1822         ph->env.nr_sibling_threads = nr;
1823         size += sizeof(u32);
1824
1825         for (i = 0; i < nr; i++) {
1826                 str = do_read_string(fd, ph);
1827                 if (!str)
1828                         goto error;
1829
1830                 /* include a NULL character at the end */
1831                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
1832                         goto error;
1833                 size += string_size(str);
1834                 free(str);
1835         }
1836         ph->env.sibling_threads = strbuf_detach(&sb, NULL);
1837
1838         /*
1839          * The header may be from old perf,
1840          * which doesn't include core id and socket id information.
1841          */
1842         if (section->size <= size) {
1843                 zfree(&ph->env.cpu);
1844                 return 0;
1845         }
1846
1847         for (i = 0; i < (u32)cpu_nr; i++) {
1848                 ret = readn(fd, &nr, sizeof(nr));
1849                 if (ret != sizeof(nr))
1850                         goto free_cpu;
1851
1852                 if (ph->needs_swap)
1853                         nr = bswap_32(nr);
1854
1855                 ph->env.cpu[i].core_id = nr;
1856
1857                 ret = readn(fd, &nr, sizeof(nr));
1858                 if (ret != sizeof(nr))
1859                         goto free_cpu;
1860
1861                 if (ph->needs_swap)
1862                         nr = bswap_32(nr);
1863
1864                 if (nr > (u32)cpu_nr) {
1865                         pr_debug("socket_id number is too big."
1866                                  "You may need to upgrade the perf tool.\n");
1867                         goto free_cpu;
1868                 }
1869
1870                 ph->env.cpu[i].socket_id = nr;
1871         }
1872
1873         return 0;
1874
1875 error:
1876         strbuf_release(&sb);
1877 free_cpu:
1878         zfree(&ph->env.cpu);
1879         return -1;
1880 }
1881
1882 static int process_numa_topology(struct perf_file_section *section __maybe_unused,
1883                                  struct perf_header *ph, int fd,
1884                                  void *data __maybe_unused)
1885 {
1886         struct numa_node *nodes, *n;
1887         ssize_t ret;
1888         u32 nr, i;
1889         char *str;
1890
1891         /* nr nodes */
1892         ret = readn(fd, &nr, sizeof(nr));
1893         if (ret != sizeof(nr))
1894                 return -1;
1895
1896         if (ph->needs_swap)
1897                 nr = bswap_32(nr);
1898
1899         ph->env.nr_numa_nodes = nr;
1900         nodes = zalloc(sizeof(*nodes) * nr);
1901         if (!nodes)
1902                 return -ENOMEM;
1903
1904         for (i = 0; i < nr; i++) {
1905                 n = &nodes[i];
1906
1907                 /* node number */
1908                 ret = readn(fd, &n->node, sizeof(u32));
1909                 if (ret != sizeof(n->node))
1910                         goto error;
1911
1912                 ret = readn(fd, &n->mem_total, sizeof(u64));
1913                 if (ret != sizeof(u64))
1914                         goto error;
1915
1916                 ret = readn(fd, &n->mem_free, sizeof(u64));
1917                 if (ret != sizeof(u64))
1918                         goto error;
1919
1920                 if (ph->needs_swap) {
1921                         n->node      = bswap_32(n->node);
1922                         n->mem_total = bswap_64(n->mem_total);
1923                         n->mem_free  = bswap_64(n->mem_free);
1924                 }
1925
1926                 str = do_read_string(fd, ph);
1927                 if (!str)
1928                         goto error;
1929
1930                 n->map = cpu_map__new(str);
1931                 if (!n->map)
1932                         goto error;
1933
1934                 free(str);
1935         }
1936         ph->env.numa_nodes = nodes;
1937         return 0;
1938
1939 error:
1940         free(nodes);
1941         return -1;
1942 }
1943
1944 static int process_pmu_mappings(struct perf_file_section *section __maybe_unused,
1945                                 struct perf_header *ph, int fd,
1946                                 void *data __maybe_unused)
1947 {
1948         ssize_t ret;
1949         char *name;
1950         u32 pmu_num;
1951         u32 type;
1952         struct strbuf sb;
1953
1954         ret = readn(fd, &pmu_num, sizeof(pmu_num));
1955         if (ret != sizeof(pmu_num))
1956                 return -1;
1957
1958         if (ph->needs_swap)
1959                 pmu_num = bswap_32(pmu_num);
1960
1961         if (!pmu_num) {
1962                 pr_debug("pmu mappings not available\n");
1963                 return 0;
1964         }
1965
1966         ph->env.nr_pmu_mappings = pmu_num;
1967         if (strbuf_init(&sb, 128) < 0)
1968                 return -1;
1969
1970         while (pmu_num) {
1971                 if (readn(fd, &type, sizeof(type)) != sizeof(type))
1972                         goto error;
1973                 if (ph->needs_swap)
1974                         type = bswap_32(type);
1975
1976                 name = do_read_string(fd, ph);
1977                 if (!name)
1978                         goto error;
1979
1980                 if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
1981                         goto error;
1982                 /* include a NULL character at the end */
1983                 if (strbuf_add(&sb, "", 1) < 0)
1984                         goto error;
1985
1986                 if (!strcmp(name, "msr"))
1987                         ph->env.msr_pmu_type = type;
1988
1989                 free(name);
1990                 pmu_num--;
1991         }
1992         ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
1993         return 0;
1994
1995 error:
1996         strbuf_release(&sb);
1997         return -1;
1998 }
1999
2000 static int process_group_desc(struct perf_file_section *section __maybe_unused,
2001                               struct perf_header *ph, int fd,
2002                               void *data __maybe_unused)
2003 {
2004         size_t ret = -1;
2005         u32 i, nr, nr_groups;
2006         struct perf_session *session;
2007         struct perf_evsel *evsel, *leader = NULL;
2008         struct group_desc {
2009                 char *name;
2010                 u32 leader_idx;
2011                 u32 nr_members;
2012         } *desc;
2013
2014         if (readn(fd, &nr_groups, sizeof(nr_groups)) != sizeof(nr_groups))
2015                 return -1;
2016
2017         if (ph->needs_swap)
2018                 nr_groups = bswap_32(nr_groups);
2019
2020         ph->env.nr_groups = nr_groups;
2021         if (!nr_groups) {
2022                 pr_debug("group desc not available\n");
2023                 return 0;
2024         }
2025
2026         desc = calloc(nr_groups, sizeof(*desc));
2027         if (!desc)
2028                 return -1;
2029
2030         for (i = 0; i < nr_groups; i++) {
2031                 desc[i].name = do_read_string(fd, ph);
2032                 if (!desc[i].name)
2033                         goto out_free;
2034
2035                 if (readn(fd, &desc[i].leader_idx, sizeof(u32)) != sizeof(u32))
2036                         goto out_free;
2037
2038                 if (readn(fd, &desc[i].nr_members, sizeof(u32)) != sizeof(u32))
2039                         goto out_free;
2040
2041                 if (ph->needs_swap) {
2042                         desc[i].leader_idx = bswap_32(desc[i].leader_idx);
2043                         desc[i].nr_members = bswap_32(desc[i].nr_members);
2044                 }
2045         }
2046
2047         /*
2048          * Rebuild group relationship based on the group_desc
2049          */
2050         session = container_of(ph, struct perf_session, header);
2051         session->evlist->nr_groups = nr_groups;
2052
2053         i = nr = 0;
2054         evlist__for_each_entry(session->evlist, evsel) {
2055                 if (evsel->idx == (int) desc[i].leader_idx) {
2056                         evsel->leader = evsel;
2057                         /* {anon_group} is a dummy name */
2058                         if (strcmp(desc[i].name, "{anon_group}")) {
2059                                 evsel->group_name = desc[i].name;
2060                                 desc[i].name = NULL;
2061                         }
2062                         evsel->nr_members = desc[i].nr_members;
2063
2064                         if (i >= nr_groups || nr > 0) {
2065                                 pr_debug("invalid group desc\n");
2066                                 goto out_free;
2067                         }
2068
2069                         leader = evsel;
2070                         nr = evsel->nr_members - 1;
2071                         i++;
2072                 } else if (nr) {
2073                         /* This is a group member */
2074                         evsel->leader = leader;
2075
2076                         nr--;
2077                 }
2078         }
2079
2080         if (i != nr_groups || nr != 0) {
2081                 pr_debug("invalid group desc\n");
2082                 goto out_free;
2083         }
2084
2085         ret = 0;
2086 out_free:
2087         for (i = 0; i < nr_groups; i++)
2088                 zfree(&desc[i].name);
2089         free(desc);
2090
2091         return ret;
2092 }
2093
2094 static int process_auxtrace(struct perf_file_section *section,
2095                             struct perf_header *ph, int fd,
2096                             void *data __maybe_unused)
2097 {
2098         struct perf_session *session;
2099         int err;
2100
2101         session = container_of(ph, struct perf_session, header);
2102
2103         err = auxtrace_index__process(fd, section->size, session,
2104                                       ph->needs_swap);
2105         if (err < 0)
2106                 pr_err("Failed to process auxtrace index\n");
2107         return err;
2108 }
2109
2110 static int process_cache(struct perf_file_section *section __maybe_unused,
2111                          struct perf_header *ph __maybe_unused, int fd __maybe_unused,
2112                          void *data __maybe_unused)
2113 {
2114         struct cpu_cache_level *caches;
2115         u32 cnt, i, version;
2116
2117         if (readn(fd, &version, sizeof(version)) != sizeof(version))
2118                 return -1;
2119
2120         if (ph->needs_swap)
2121                 version = bswap_32(version);
2122
2123         if (version != 1)
2124                 return -1;
2125
2126         if (readn(fd, &cnt, sizeof(cnt)) != sizeof(cnt))
2127                 return -1;
2128
2129         if (ph->needs_swap)
2130                 cnt = bswap_32(cnt);
2131
2132         caches = zalloc(sizeof(*caches) * cnt);
2133         if (!caches)
2134                 return -1;
2135
2136         for (i = 0; i < cnt; i++) {
2137                 struct cpu_cache_level c;
2138
2139                 #define _R(v)                                           \
2140                         if (readn(fd, &c.v, sizeof(u32)) != sizeof(u32))\
2141                                 goto out_free_caches;                   \
2142                         if (ph->needs_swap)                             \
2143                                 c.v = bswap_32(c.v);                    \
2144
2145                 _R(level)
2146                 _R(line_size)
2147                 _R(sets)
2148                 _R(ways)
2149                 #undef _R
2150
2151                 #define _R(v)                           \
2152                         c.v = do_read_string(fd, ph);   \
2153                         if (!c.v)                       \
2154                                 goto out_free_caches;
2155
2156                 _R(type)
2157                 _R(size)
2158                 _R(map)
2159                 #undef _R
2160
2161                 caches[i] = c;
2162         }
2163
2164         ph->env.caches = caches;
2165         ph->env.caches_cnt = cnt;
2166         return 0;
2167 out_free_caches:
2168         free(caches);
2169         return -1;
2170 }
2171
2172 struct feature_ops {
2173         int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
2174         void (*print)(struct perf_header *h, int fd, FILE *fp);
2175         int (*process)(struct perf_file_section *section,
2176                        struct perf_header *h, int fd, void *data);
2177         const char *name;
2178         bool full_only;
2179 };
2180
2181 #define FEAT_OPA(n, func) \
2182         [n] = { .name = #n, .write = write_##func, .print = print_##func }
2183 #define FEAT_OPP(n, func) \
2184         [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2185                 .process = process_##func }
2186 #define FEAT_OPF(n, func) \
2187         [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2188                 .process = process_##func, .full_only = true }
2189
2190 /* feature_ops not implemented: */
2191 #define print_tracing_data      NULL
2192 #define print_build_id          NULL
2193
2194 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2195         FEAT_OPP(HEADER_TRACING_DATA,   tracing_data),
2196         FEAT_OPP(HEADER_BUILD_ID,       build_id),
2197         FEAT_OPP(HEADER_HOSTNAME,       hostname),
2198         FEAT_OPP(HEADER_OSRELEASE,      osrelease),
2199         FEAT_OPP(HEADER_VERSION,        version),
2200         FEAT_OPP(HEADER_ARCH,           arch),
2201         FEAT_OPP(HEADER_NRCPUS,         nrcpus),
2202         FEAT_OPP(HEADER_CPUDESC,        cpudesc),
2203         FEAT_OPP(HEADER_CPUID,          cpuid),
2204         FEAT_OPP(HEADER_TOTAL_MEM,      total_mem),
2205         FEAT_OPP(HEADER_EVENT_DESC,     event_desc),
2206         FEAT_OPP(HEADER_CMDLINE,        cmdline),
2207         FEAT_OPF(HEADER_CPU_TOPOLOGY,   cpu_topology),
2208         FEAT_OPF(HEADER_NUMA_TOPOLOGY,  numa_topology),
2209         FEAT_OPA(HEADER_BRANCH_STACK,   branch_stack),
2210         FEAT_OPP(HEADER_PMU_MAPPINGS,   pmu_mappings),
2211         FEAT_OPP(HEADER_GROUP_DESC,     group_desc),
2212         FEAT_OPP(HEADER_AUXTRACE,       auxtrace),
2213         FEAT_OPA(HEADER_STAT,           stat),
2214         FEAT_OPF(HEADER_CACHE,          cache),
2215 };
2216
2217 struct header_print_data {
2218         FILE *fp;
2219         bool full; /* extended list of headers */
2220 };
2221
2222 static int perf_file_section__fprintf_info(struct perf_file_section *section,
2223                                            struct perf_header *ph,
2224                                            int feat, int fd, void *data)
2225 {
2226         struct header_print_data *hd = data;
2227
2228         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2229                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2230                                 "%d, continuing...\n", section->offset, feat);
2231                 return 0;
2232         }
2233         if (feat >= HEADER_LAST_FEATURE) {
2234                 pr_warning("unknown feature %d\n", feat);
2235                 return 0;
2236         }
2237         if (!feat_ops[feat].print)
2238                 return 0;
2239
2240         if (!feat_ops[feat].full_only || hd->full)
2241                 feat_ops[feat].print(ph, fd, hd->fp);
2242         else
2243                 fprintf(hd->fp, "# %s info available, use -I to display\n",
2244                         feat_ops[feat].name);
2245
2246         return 0;
2247 }
2248
2249 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2250 {
2251         struct header_print_data hd;
2252         struct perf_header *header = &session->header;
2253         int fd = perf_data_file__fd(session->file);
2254         hd.fp = fp;
2255         hd.full = full;
2256
2257         perf_header__process_sections(header, fd, &hd,
2258                                       perf_file_section__fprintf_info);
2259         return 0;
2260 }
2261
2262 static int do_write_feat(int fd, struct perf_header *h, int type,
2263                          struct perf_file_section **p,
2264                          struct perf_evlist *evlist)
2265 {
2266         int err;
2267         int ret = 0;
2268
2269         if (perf_header__has_feat(h, type)) {
2270                 if (!feat_ops[type].write)
2271                         return -1;
2272
2273                 (*p)->offset = lseek(fd, 0, SEEK_CUR);
2274
2275                 err = feat_ops[type].write(fd, h, evlist);
2276                 if (err < 0) {
2277                         pr_debug("failed to write feature %d\n", type);
2278
2279                         /* undo anything written */
2280                         lseek(fd, (*p)->offset, SEEK_SET);
2281
2282                         return -1;
2283                 }
2284                 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
2285                 (*p)++;
2286         }
2287         return ret;
2288 }
2289
2290 static int perf_header__adds_write(struct perf_header *header,
2291                                    struct perf_evlist *evlist, int fd)
2292 {
2293         int nr_sections;
2294         struct perf_file_section *feat_sec, *p;
2295         int sec_size;
2296         u64 sec_start;
2297         int feat;
2298         int err;
2299
2300         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2301         if (!nr_sections)
2302                 return 0;
2303
2304         feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2305         if (feat_sec == NULL)
2306                 return -ENOMEM;
2307
2308         sec_size = sizeof(*feat_sec) * nr_sections;
2309
2310         sec_start = header->feat_offset;
2311         lseek(fd, sec_start + sec_size, SEEK_SET);
2312
2313         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2314                 if (do_write_feat(fd, header, feat, &p, evlist))
2315                         perf_header__clear_feat(header, feat);
2316         }
2317
2318         lseek(fd, sec_start, SEEK_SET);
2319         /*
2320          * may write more than needed due to dropped feature, but
2321          * this is okay, reader will skip the mising entries
2322          */
2323         err = do_write(fd, feat_sec, sec_size);
2324         if (err < 0)
2325                 pr_debug("failed to write feature section\n");
2326         free(feat_sec);
2327         return err;
2328 }
2329
2330 int perf_header__write_pipe(int fd)
2331 {
2332         struct perf_pipe_file_header f_header;
2333         int err;
2334
2335         f_header = (struct perf_pipe_file_header){
2336                 .magic     = PERF_MAGIC,
2337                 .size      = sizeof(f_header),
2338         };
2339
2340         err = do_write(fd, &f_header, sizeof(f_header));
2341         if (err < 0) {
2342                 pr_debug("failed to write perf pipe header\n");
2343                 return err;
2344         }
2345
2346         return 0;
2347 }
2348
2349 int perf_session__write_header(struct perf_session *session,
2350                                struct perf_evlist *evlist,
2351                                int fd, bool at_exit)
2352 {
2353         struct perf_file_header f_header;
2354         struct perf_file_attr   f_attr;
2355         struct perf_header *header = &session->header;
2356         struct perf_evsel *evsel;
2357         u64 attr_offset;
2358         int err;
2359
2360         lseek(fd, sizeof(f_header), SEEK_SET);
2361
2362         evlist__for_each_entry(session->evlist, evsel) {
2363                 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2364                 err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
2365                 if (err < 0) {
2366                         pr_debug("failed to write perf header\n");
2367                         return err;
2368                 }
2369         }
2370
2371         attr_offset = lseek(fd, 0, SEEK_CUR);
2372
2373         evlist__for_each_entry(evlist, evsel) {
2374                 f_attr = (struct perf_file_attr){
2375                         .attr = evsel->attr,
2376                         .ids  = {
2377                                 .offset = evsel->id_offset,
2378                                 .size   = evsel->ids * sizeof(u64),
2379                         }
2380                 };
2381                 err = do_write(fd, &f_attr, sizeof(f_attr));
2382                 if (err < 0) {
2383                         pr_debug("failed to write perf header attribute\n");
2384                         return err;
2385                 }
2386         }
2387
2388         if (!header->data_offset)
2389                 header->data_offset = lseek(fd, 0, SEEK_CUR);
2390         header->feat_offset = header->data_offset + header->data_size;
2391
2392         if (at_exit) {
2393                 err = perf_header__adds_write(header, evlist, fd);
2394                 if (err < 0)
2395                         return err;
2396         }
2397
2398         f_header = (struct perf_file_header){
2399                 .magic     = PERF_MAGIC,
2400                 .size      = sizeof(f_header),
2401                 .attr_size = sizeof(f_attr),
2402                 .attrs = {
2403                         .offset = attr_offset,
2404                         .size   = evlist->nr_entries * sizeof(f_attr),
2405                 },
2406                 .data = {
2407                         .offset = header->data_offset,
2408                         .size   = header->data_size,
2409                 },
2410                 /* event_types is ignored, store zeros */
2411         };
2412
2413         memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2414
2415         lseek(fd, 0, SEEK_SET);
2416         err = do_write(fd, &f_header, sizeof(f_header));
2417         if (err < 0) {
2418                 pr_debug("failed to write perf header\n");
2419                 return err;
2420         }
2421         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2422
2423         return 0;
2424 }
2425
2426 static int perf_header__getbuffer64(struct perf_header *header,
2427                                     int fd, void *buf, size_t size)
2428 {
2429         if (readn(fd, buf, size) <= 0)
2430                 return -1;
2431
2432         if (header->needs_swap)
2433                 mem_bswap_64(buf, size);
2434
2435         return 0;
2436 }
2437
2438 int perf_header__process_sections(struct perf_header *header, int fd,
2439                                   void *data,
2440                                   int (*process)(struct perf_file_section *section,
2441                                                  struct perf_header *ph,
2442                                                  int feat, int fd, void *data))
2443 {
2444         struct perf_file_section *feat_sec, *sec;
2445         int nr_sections;
2446         int sec_size;
2447         int feat;
2448         int err;
2449
2450         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2451         if (!nr_sections)
2452                 return 0;
2453
2454         feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2455         if (!feat_sec)
2456                 return -1;
2457
2458         sec_size = sizeof(*feat_sec) * nr_sections;
2459
2460         lseek(fd, header->feat_offset, SEEK_SET);
2461
2462         err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2463         if (err < 0)
2464                 goto out_free;
2465
2466         for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2467                 err = process(sec++, header, feat, fd, data);
2468                 if (err < 0)
2469                         goto out_free;
2470         }
2471         err = 0;
2472 out_free:
2473         free(feat_sec);
2474         return err;
2475 }
2476
2477 static const int attr_file_abi_sizes[] = {
2478         [0] = PERF_ATTR_SIZE_VER0,
2479         [1] = PERF_ATTR_SIZE_VER1,
2480         [2] = PERF_ATTR_SIZE_VER2,
2481         [3] = PERF_ATTR_SIZE_VER3,
2482         [4] = PERF_ATTR_SIZE_VER4,
2483         0,
2484 };
2485
2486 /*
2487  * In the legacy file format, the magic number is not used to encode endianness.
2488  * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2489  * on ABI revisions, we need to try all combinations for all endianness to
2490  * detect the endianness.
2491  */
2492 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2493 {
2494         uint64_t ref_size, attr_size;
2495         int i;
2496
2497         for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2498                 ref_size = attr_file_abi_sizes[i]
2499                          + sizeof(struct perf_file_section);
2500                 if (hdr_sz != ref_size) {
2501                         attr_size = bswap_64(hdr_sz);
2502                         if (attr_size != ref_size)
2503                                 continue;
2504
2505                         ph->needs_swap = true;
2506                 }
2507                 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2508                          i,
2509                          ph->needs_swap);
2510                 return 0;
2511         }
2512         /* could not determine endianness */
2513         return -1;
2514 }
2515
2516 #define PERF_PIPE_HDR_VER0      16
2517
2518 static const size_t attr_pipe_abi_sizes[] = {
2519         [0] = PERF_PIPE_HDR_VER0,
2520         0,
2521 };
2522
2523 /*
2524  * In the legacy pipe format, there is an implicit assumption that endiannesss
2525  * between host recording the samples, and host parsing the samples is the
2526  * same. This is not always the case given that the pipe output may always be
2527  * redirected into a file and analyzed on a different machine with possibly a
2528  * different endianness and perf_event ABI revsions in the perf tool itself.
2529  */
2530 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2531 {
2532         u64 attr_size;
2533         int i;
2534
2535         for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2536                 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2537                         attr_size = bswap_64(hdr_sz);
2538                         if (attr_size != hdr_sz)
2539                                 continue;
2540
2541                         ph->needs_swap = true;
2542                 }
2543                 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2544                 return 0;
2545         }
2546         return -1;
2547 }
2548
2549 bool is_perf_magic(u64 magic)
2550 {
2551         if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2552                 || magic == __perf_magic2
2553                 || magic == __perf_magic2_sw)
2554                 return true;
2555
2556         return false;
2557 }
2558
2559 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2560                               bool is_pipe, struct perf_header *ph)
2561 {
2562         int ret;
2563
2564         /* check for legacy format */
2565         ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2566         if (ret == 0) {
2567                 ph->version = PERF_HEADER_VERSION_1;
2568                 pr_debug("legacy perf.data format\n");
2569                 if (is_pipe)
2570                         return try_all_pipe_abis(hdr_sz, ph);
2571
2572                 return try_all_file_abis(hdr_sz, ph);
2573         }
2574         /*
2575          * the new magic number serves two purposes:
2576          * - unique number to identify actual perf.data files
2577          * - encode endianness of file
2578          */
2579         ph->version = PERF_HEADER_VERSION_2;
2580
2581         /* check magic number with one endianness */
2582         if (magic == __perf_magic2)
2583                 return 0;
2584
2585         /* check magic number with opposite endianness */
2586         if (magic != __perf_magic2_sw)
2587                 return -1;
2588
2589         ph->needs_swap = true;
2590
2591         return 0;
2592 }
2593
2594 int perf_file_header__read(struct perf_file_header *header,
2595                            struct perf_header *ph, int fd)
2596 {
2597         ssize_t ret;
2598
2599         lseek(fd, 0, SEEK_SET);
2600
2601         ret = readn(fd, header, sizeof(*header));
2602         if (ret <= 0)
2603                 return -1;
2604
2605         if (check_magic_endian(header->magic,
2606                                header->attr_size, false, ph) < 0) {
2607                 pr_debug("magic/endian check failed\n");
2608                 return -1;
2609         }
2610
2611         if (ph->needs_swap) {
2612                 mem_bswap_64(header, offsetof(struct perf_file_header,
2613                              adds_features));
2614         }
2615
2616         if (header->size != sizeof(*header)) {
2617                 /* Support the previous format */
2618                 if (header->size == offsetof(typeof(*header), adds_features))
2619                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2620                 else
2621                         return -1;
2622         } else if (ph->needs_swap) {
2623                 /*
2624                  * feature bitmap is declared as an array of unsigned longs --
2625                  * not good since its size can differ between the host that
2626                  * generated the data file and the host analyzing the file.
2627                  *
2628                  * We need to handle endianness, but we don't know the size of
2629                  * the unsigned long where the file was generated. Take a best
2630                  * guess at determining it: try 64-bit swap first (ie., file
2631                  * created on a 64-bit host), and check if the hostname feature
2632                  * bit is set (this feature bit is forced on as of fbe96f2).
2633                  * If the bit is not, undo the 64-bit swap and try a 32-bit
2634                  * swap. If the hostname bit is still not set (e.g., older data
2635                  * file), punt and fallback to the original behavior --
2636                  * clearing all feature bits and setting buildid.
2637                  */
2638                 mem_bswap_64(&header->adds_features,
2639                             BITS_TO_U64(HEADER_FEAT_BITS));
2640
2641                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2642                         /* unswap as u64 */
2643                         mem_bswap_64(&header->adds_features,
2644                                     BITS_TO_U64(HEADER_FEAT_BITS));
2645
2646                         /* unswap as u32 */
2647                         mem_bswap_32(&header->adds_features,
2648                                     BITS_TO_U32(HEADER_FEAT_BITS));
2649                 }
2650
2651                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2652                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2653                         set_bit(HEADER_BUILD_ID, header->adds_features);
2654                 }
2655         }
2656
2657         memcpy(&ph->adds_features, &header->adds_features,
2658                sizeof(ph->adds_features));
2659
2660         ph->data_offset  = header->data.offset;
2661         ph->data_size    = header->data.size;
2662         ph->feat_offset  = header->data.offset + header->data.size;
2663         return 0;
2664 }
2665
2666 static int perf_file_section__process(struct perf_file_section *section,
2667                                       struct perf_header *ph,
2668                                       int feat, int fd, void *data)
2669 {
2670         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2671                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2672                           "%d, continuing...\n", section->offset, feat);
2673                 return 0;
2674         }
2675
2676         if (feat >= HEADER_LAST_FEATURE) {
2677                 pr_debug("unknown feature %d, continuing...\n", feat);
2678                 return 0;
2679         }
2680
2681         if (!feat_ops[feat].process)
2682                 return 0;
2683
2684         return feat_ops[feat].process(section, ph, fd, data);
2685 }
2686
2687 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2688                                        struct perf_header *ph, int fd,
2689                                        bool repipe)
2690 {
2691         ssize_t ret;
2692
2693         ret = readn(fd, header, sizeof(*header));
2694         if (ret <= 0)
2695                 return -1;
2696
2697         if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2698                 pr_debug("endian/magic failed\n");
2699                 return -1;
2700         }
2701
2702         if (ph->needs_swap)
2703                 header->size = bswap_64(header->size);
2704
2705         if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
2706                 return -1;
2707
2708         return 0;
2709 }
2710
2711 static int perf_header__read_pipe(struct perf_session *session)
2712 {
2713         struct perf_header *header = &session->header;
2714         struct perf_pipe_file_header f_header;
2715
2716         if (perf_file_header__read_pipe(&f_header, header,
2717                                         perf_data_file__fd(session->file),
2718                                         session->repipe) < 0) {
2719                 pr_debug("incompatible file format\n");
2720                 return -EINVAL;
2721         }
2722
2723         return 0;
2724 }
2725
2726 static int read_attr(int fd, struct perf_header *ph,
2727                      struct perf_file_attr *f_attr)
2728 {
2729         struct perf_event_attr *attr = &f_attr->attr;
2730         size_t sz, left;
2731         size_t our_sz = sizeof(f_attr->attr);
2732         ssize_t ret;
2733
2734         memset(f_attr, 0, sizeof(*f_attr));
2735
2736         /* read minimal guaranteed structure */
2737         ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2738         if (ret <= 0) {
2739                 pr_debug("cannot read %d bytes of header attr\n",
2740                          PERF_ATTR_SIZE_VER0);
2741                 return -1;
2742         }
2743
2744         /* on file perf_event_attr size */
2745         sz = attr->size;
2746
2747         if (ph->needs_swap)
2748                 sz = bswap_32(sz);
2749
2750         if (sz == 0) {
2751                 /* assume ABI0 */
2752                 sz =  PERF_ATTR_SIZE_VER0;
2753         } else if (sz > our_sz) {
2754                 pr_debug("file uses a more recent and unsupported ABI"
2755                          " (%zu bytes extra)\n", sz - our_sz);
2756                 return -1;
2757         }
2758         /* what we have not yet read and that we know about */
2759         left = sz - PERF_ATTR_SIZE_VER0;
2760         if (left) {
2761                 void *ptr = attr;
2762                 ptr += PERF_ATTR_SIZE_VER0;
2763
2764                 ret = readn(fd, ptr, left);
2765         }
2766         /* read perf_file_section, ids are read in caller */
2767         ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2768
2769         return ret <= 0 ? -1 : 0;
2770 }
2771
2772 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
2773                                                 struct pevent *pevent)
2774 {
2775         struct event_format *event;
2776         char bf[128];
2777
2778         /* already prepared */
2779         if (evsel->tp_format)
2780                 return 0;
2781
2782         if (pevent == NULL) {
2783                 pr_debug("broken or missing trace data\n");
2784                 return -1;
2785         }
2786
2787         event = pevent_find_event(pevent, evsel->attr.config);
2788         if (event == NULL)
2789                 return -1;
2790
2791         if (!evsel->name) {
2792                 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2793                 evsel->name = strdup(bf);
2794                 if (evsel->name == NULL)
2795                         return -1;
2796         }
2797
2798         evsel->tp_format = event;
2799         return 0;
2800 }
2801
2802 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
2803                                                   struct pevent *pevent)
2804 {
2805         struct perf_evsel *pos;
2806
2807         evlist__for_each_entry(evlist, pos) {
2808                 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2809                     perf_evsel__prepare_tracepoint_event(pos, pevent))
2810                         return -1;
2811         }
2812
2813         return 0;
2814 }
2815
2816 int perf_session__read_header(struct perf_session *session)
2817 {
2818         struct perf_data_file *file = session->file;
2819         struct perf_header *header = &session->header;
2820         struct perf_file_header f_header;
2821         struct perf_file_attr   f_attr;
2822         u64                     f_id;
2823         int nr_attrs, nr_ids, i, j;
2824         int fd = perf_data_file__fd(file);
2825
2826         session->evlist = perf_evlist__new();
2827         if (session->evlist == NULL)
2828                 return -ENOMEM;
2829
2830         session->evlist->env = &header->env;
2831         session->machines.host.env = &header->env;
2832         if (perf_data_file__is_pipe(file))
2833                 return perf_header__read_pipe(session);
2834
2835         if (perf_file_header__read(&f_header, header, fd) < 0)
2836                 return -EINVAL;
2837
2838         /*
2839          * Sanity check that perf.data was written cleanly; data size is
2840          * initialized to 0 and updated only if the on_exit function is run.
2841          * If data size is still 0 then the file contains only partial
2842          * information.  Just warn user and process it as much as it can.
2843          */
2844         if (f_header.data.size == 0) {
2845                 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
2846                            "Was the 'perf record' command properly terminated?\n",
2847                            file->path);
2848         }
2849
2850         nr_attrs = f_header.attrs.size / f_header.attr_size;
2851         lseek(fd, f_header.attrs.offset, SEEK_SET);
2852
2853         for (i = 0; i < nr_attrs; i++) {
2854                 struct perf_evsel *evsel;
2855                 off_t tmp;
2856
2857                 if (read_attr(fd, header, &f_attr) < 0)
2858                         goto out_errno;
2859
2860                 if (header->needs_swap) {
2861                         f_attr.ids.size   = bswap_64(f_attr.ids.size);
2862                         f_attr.ids.offset = bswap_64(f_attr.ids.offset);
2863                         perf_event__attr_swap(&f_attr.attr);
2864                 }
2865
2866                 tmp = lseek(fd, 0, SEEK_CUR);
2867                 evsel = perf_evsel__new(&f_attr.attr);
2868
2869                 if (evsel == NULL)
2870                         goto out_delete_evlist;
2871
2872                 evsel->needs_swap = header->needs_swap;
2873                 /*
2874                  * Do it before so that if perf_evsel__alloc_id fails, this
2875                  * entry gets purged too at perf_evlist__delete().
2876                  */
2877                 perf_evlist__add(session->evlist, evsel);
2878
2879                 nr_ids = f_attr.ids.size / sizeof(u64);
2880                 /*
2881                  * We don't have the cpu and thread maps on the header, so
2882                  * for allocating the perf_sample_id table we fake 1 cpu and
2883                  * hattr->ids threads.
2884                  */
2885                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2886                         goto out_delete_evlist;
2887
2888                 lseek(fd, f_attr.ids.offset, SEEK_SET);
2889
2890                 for (j = 0; j < nr_ids; j++) {
2891                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2892                                 goto out_errno;
2893
2894                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2895                 }
2896
2897                 lseek(fd, tmp, SEEK_SET);
2898         }
2899
2900         symbol_conf.nr_events = nr_attrs;
2901
2902         perf_header__process_sections(header, fd, &session->tevent,
2903                                       perf_file_section__process);
2904
2905         if (perf_evlist__prepare_tracepoint_events(session->evlist,
2906                                                    session->tevent.pevent))
2907                 goto out_delete_evlist;
2908
2909         return 0;
2910 out_errno:
2911         return -errno;
2912
2913 out_delete_evlist:
2914         perf_evlist__delete(session->evlist);
2915         session->evlist = NULL;
2916         return -ENOMEM;
2917 }
2918
2919 int perf_event__synthesize_attr(struct perf_tool *tool,
2920                                 struct perf_event_attr *attr, u32 ids, u64 *id,
2921                                 perf_event__handler_t process)
2922 {
2923         union perf_event *ev;
2924         size_t size;
2925         int err;
2926
2927         size = sizeof(struct perf_event_attr);
2928         size = PERF_ALIGN(size, sizeof(u64));
2929         size += sizeof(struct perf_event_header);
2930         size += ids * sizeof(u64);
2931
2932         ev = malloc(size);
2933
2934         if (ev == NULL)
2935                 return -ENOMEM;
2936
2937         ev->attr.attr = *attr;
2938         memcpy(ev->attr.id, id, ids * sizeof(u64));
2939
2940         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2941         ev->attr.header.size = (u16)size;
2942
2943         if (ev->attr.header.size == size)
2944                 err = process(tool, ev, NULL, NULL);
2945         else
2946                 err = -E2BIG;
2947
2948         free(ev);
2949
2950         return err;
2951 }
2952
2953 static struct event_update_event *
2954 event_update_event__new(size_t size, u64 type, u64 id)
2955 {
2956         struct event_update_event *ev;
2957
2958         size += sizeof(*ev);
2959         size  = PERF_ALIGN(size, sizeof(u64));
2960
2961         ev = zalloc(size);
2962         if (ev) {
2963                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
2964                 ev->header.size = (u16)size;
2965                 ev->type = type;
2966                 ev->id = id;
2967         }
2968         return ev;
2969 }
2970
2971 int
2972 perf_event__synthesize_event_update_unit(struct perf_tool *tool,
2973                                          struct perf_evsel *evsel,
2974                                          perf_event__handler_t process)
2975 {
2976         struct event_update_event *ev;
2977         size_t size = strlen(evsel->unit);
2978         int err;
2979
2980         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
2981         if (ev == NULL)
2982                 return -ENOMEM;
2983
2984         strncpy(ev->data, evsel->unit, size);
2985         err = process(tool, (union perf_event *)ev, NULL, NULL);
2986         free(ev);
2987         return err;
2988 }
2989
2990 int
2991 perf_event__synthesize_event_update_scale(struct perf_tool *tool,
2992                                           struct perf_evsel *evsel,
2993                                           perf_event__handler_t process)
2994 {
2995         struct event_update_event *ev;
2996         struct event_update_event_scale *ev_data;
2997         int err;
2998
2999         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->id[0]);
3000         if (ev == NULL)
3001                 return -ENOMEM;
3002
3003         ev_data = (struct event_update_event_scale *) ev->data;
3004         ev_data->scale = evsel->scale;
3005         err = process(tool, (union perf_event*) ev, NULL, NULL);
3006         free(ev);
3007         return err;
3008 }
3009
3010 int
3011 perf_event__synthesize_event_update_name(struct perf_tool *tool,
3012                                          struct perf_evsel *evsel,
3013                                          perf_event__handler_t process)
3014 {
3015         struct event_update_event *ev;
3016         size_t len = strlen(evsel->name);
3017         int err;
3018
3019         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->id[0]);
3020         if (ev == NULL)
3021                 return -ENOMEM;
3022
3023         strncpy(ev->data, evsel->name, len);
3024         err = process(tool, (union perf_event*) ev, NULL, NULL);
3025         free(ev);
3026         return err;
3027 }
3028
3029 int
3030 perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
3031                                         struct perf_evsel *evsel,
3032                                         perf_event__handler_t process)
3033 {
3034         size_t size = sizeof(struct event_update_event);
3035         struct event_update_event *ev;
3036         int max, err;
3037         u16 type;
3038
3039         if (!evsel->own_cpus)
3040                 return 0;
3041
3042         ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
3043         if (!ev)
3044                 return -ENOMEM;
3045
3046         ev->header.type = PERF_RECORD_EVENT_UPDATE;
3047         ev->header.size = (u16)size;
3048         ev->type = PERF_EVENT_UPDATE__CPUS;
3049         ev->id   = evsel->id[0];
3050
3051         cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
3052                                  evsel->own_cpus,
3053                                  type, max);
3054
3055         err = process(tool, (union perf_event*) ev, NULL, NULL);
3056         free(ev);
3057         return err;
3058 }
3059
3060 size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
3061 {
3062         struct event_update_event *ev = &event->event_update;
3063         struct event_update_event_scale *ev_scale;
3064         struct event_update_event_cpus *ev_cpus;
3065         struct cpu_map *map;
3066         size_t ret;
3067
3068         ret = fprintf(fp, "\n... id:    %" PRIu64 "\n", ev->id);
3069
3070         switch (ev->type) {
3071         case PERF_EVENT_UPDATE__SCALE:
3072                 ev_scale = (struct event_update_event_scale *) ev->data;
3073                 ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
3074                 break;
3075         case PERF_EVENT_UPDATE__UNIT:
3076                 ret += fprintf(fp, "... unit:  %s\n", ev->data);
3077                 break;
3078         case PERF_EVENT_UPDATE__NAME:
3079                 ret += fprintf(fp, "... name:  %s\n", ev->data);
3080                 break;
3081         case PERF_EVENT_UPDATE__CPUS:
3082                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3083                 ret += fprintf(fp, "... ");
3084
3085                 map = cpu_map__new_data(&ev_cpus->cpus);
3086                 if (map)
3087                         ret += cpu_map__fprintf(map, fp);
3088                 else
3089                         ret += fprintf(fp, "failed to get cpus\n");
3090                 break;
3091         default:
3092                 ret += fprintf(fp, "... unknown type\n");
3093                 break;
3094         }
3095
3096         return ret;
3097 }
3098
3099 int perf_event__synthesize_attrs(struct perf_tool *tool,
3100                                    struct perf_session *session,
3101                                    perf_event__handler_t process)
3102 {
3103         struct perf_evsel *evsel;
3104         int err = 0;
3105
3106         evlist__for_each_entry(session->evlist, evsel) {
3107                 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
3108                                                   evsel->id, process);
3109                 if (err) {
3110                         pr_debug("failed to create perf header attribute\n");
3111                         return err;
3112                 }
3113         }
3114
3115         return err;
3116 }
3117
3118 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
3119                              union perf_event *event,
3120                              struct perf_evlist **pevlist)
3121 {
3122         u32 i, ids, n_ids;
3123         struct perf_evsel *evsel;
3124         struct perf_evlist *evlist = *pevlist;
3125
3126         if (evlist == NULL) {
3127                 *pevlist = evlist = perf_evlist__new();
3128                 if (evlist == NULL)
3129                         return -ENOMEM;
3130         }
3131
3132         evsel = perf_evsel__new(&event->attr.attr);
3133         if (evsel == NULL)
3134                 return -ENOMEM;
3135
3136         perf_evlist__add(evlist, evsel);
3137
3138         ids = event->header.size;
3139         ids -= (void *)&event->attr.id - (void *)event;
3140         n_ids = ids / sizeof(u64);
3141         /*
3142          * We don't have the cpu and thread maps on the header, so
3143          * for allocating the perf_sample_id table we fake 1 cpu and
3144          * hattr->ids threads.
3145          */
3146         if (perf_evsel__alloc_id(evsel, 1, n_ids))
3147                 return -ENOMEM;
3148
3149         for (i = 0; i < n_ids; i++) {
3150                 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3151         }
3152
3153         symbol_conf.nr_events = evlist->nr_entries;
3154
3155         return 0;
3156 }
3157
3158 int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
3159                                      union perf_event *event,
3160                                      struct perf_evlist **pevlist)
3161 {
3162         struct event_update_event *ev = &event->event_update;
3163         struct event_update_event_scale *ev_scale;
3164         struct event_update_event_cpus *ev_cpus;
3165         struct perf_evlist *evlist;
3166         struct perf_evsel *evsel;
3167         struct cpu_map *map;
3168
3169         if (!pevlist || *pevlist == NULL)
3170                 return -EINVAL;
3171
3172         evlist = *pevlist;
3173
3174         evsel = perf_evlist__id2evsel(evlist, ev->id);
3175         if (evsel == NULL)
3176                 return -EINVAL;
3177
3178         switch (ev->type) {
3179         case PERF_EVENT_UPDATE__UNIT:
3180                 evsel->unit = strdup(ev->data);
3181                 break;
3182         case PERF_EVENT_UPDATE__NAME:
3183                 evsel->name = strdup(ev->data);
3184                 break;
3185         case PERF_EVENT_UPDATE__SCALE:
3186                 ev_scale = (struct event_update_event_scale *) ev->data;
3187                 evsel->scale = ev_scale->scale;
3188         case PERF_EVENT_UPDATE__CPUS:
3189                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3190
3191                 map = cpu_map__new_data(&ev_cpus->cpus);
3192                 if (map)
3193                         evsel->own_cpus = map;
3194                 else
3195                         pr_err("failed to get event_update cpus\n");
3196         default:
3197                 break;
3198         }
3199
3200         return 0;
3201 }
3202
3203 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3204                                         struct perf_evlist *evlist,
3205                                         perf_event__handler_t process)
3206 {
3207         union perf_event ev;
3208         struct tracing_data *tdata;
3209         ssize_t size = 0, aligned_size = 0, padding;
3210         int err __maybe_unused = 0;
3211
3212         /*
3213          * We are going to store the size of the data followed
3214          * by the data contents. Since the fd descriptor is a pipe,
3215          * we cannot seek back to store the size of the data once
3216          * we know it. Instead we:
3217          *
3218          * - write the tracing data to the temp file
3219          * - get/write the data size to pipe
3220          * - write the tracing data from the temp file
3221          *   to the pipe
3222          */
3223         tdata = tracing_data_get(&evlist->entries, fd, true);
3224         if (!tdata)
3225                 return -1;
3226
3227         memset(&ev, 0, sizeof(ev));
3228
3229         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3230         size = tdata->size;
3231         aligned_size = PERF_ALIGN(size, sizeof(u64));
3232         padding = aligned_size - size;
3233         ev.tracing_data.header.size = sizeof(ev.tracing_data);
3234         ev.tracing_data.size = aligned_size;
3235
3236         process(tool, &ev, NULL, NULL);
3237
3238         /*
3239          * The put function will copy all the tracing data
3240          * stored in temp file to the pipe.
3241          */
3242         tracing_data_put(tdata);
3243
3244         write_padded(fd, NULL, 0, padding);
3245
3246         return aligned_size;
3247 }
3248
3249 int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
3250                                      union perf_event *event,
3251                                      struct perf_session *session)
3252 {
3253         ssize_t size_read, padding, size = event->tracing_data.size;
3254         int fd = perf_data_file__fd(session->file);
3255         off_t offset = lseek(fd, 0, SEEK_CUR);
3256         char buf[BUFSIZ];
3257
3258         /* setup for reading amidst mmap */
3259         lseek(fd, offset + sizeof(struct tracing_data_event),
3260               SEEK_SET);
3261
3262         size_read = trace_report(fd, &session->tevent,
3263                                  session->repipe);
3264         padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3265
3266         if (readn(fd, buf, padding) < 0) {
3267                 pr_err("%s: reading input file", __func__);
3268                 return -1;
3269         }
3270         if (session->repipe) {
3271                 int retw = write(STDOUT_FILENO, buf, padding);
3272                 if (retw <= 0 || retw != padding) {
3273                         pr_err("%s: repiping tracing data padding", __func__);
3274                         return -1;
3275                 }
3276         }
3277
3278         if (size_read + padding != size) {
3279                 pr_err("%s: tracing data size mismatch", __func__);
3280                 return -1;
3281         }
3282
3283         perf_evlist__prepare_tracepoint_events(session->evlist,
3284                                                session->tevent.pevent);
3285
3286         return size_read + padding;
3287 }
3288
3289 int perf_event__synthesize_build_id(struct perf_tool *tool,
3290                                     struct dso *pos, u16 misc,
3291                                     perf_event__handler_t process,
3292                                     struct machine *machine)
3293 {
3294         union perf_event ev;
3295         size_t len;
3296         int err = 0;
3297
3298         if (!pos->hit)
3299                 return err;
3300
3301         memset(&ev, 0, sizeof(ev));
3302
3303         len = pos->long_name_len + 1;
3304         len = PERF_ALIGN(len, NAME_ALIGN);
3305         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3306         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3307         ev.build_id.header.misc = misc;
3308         ev.build_id.pid = machine->pid;
3309         ev.build_id.header.size = sizeof(ev.build_id) + len;
3310         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3311
3312         err = process(tool, &ev, NULL, machine);
3313
3314         return err;
3315 }
3316
3317 int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
3318                                  union perf_event *event,
3319                                  struct perf_session *session)
3320 {
3321         __event_process_build_id(&event->build_id,
3322                                  event->build_id.filename,
3323                                  session);
3324         return 0;
3325 }