tools/perf/util/header.c

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