tools/perf/util/header.c

   1 #define _FILE_OFFSET_BITS 64
   2
   3 #include <sys/types.h>
   4 #include <byteswap.h>
   5 #include <unistd.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <linux/list.h>
   9 #include <linux/kernel.h>
  10
  11 #include "evlist.h"
  12 #include "evsel.h"
  13 #include "util.h"
  14 #include "header.h"
  15 #include "../perf.h"
  16 #include "trace-event.h"
  17 #include "session.h"
  18 #include "symbol.h"
  19 #include "debug.h"
  20
  21 static bool no_buildid_cache = false;
  22
  23 static int event_count;
  24 static struct perf_trace_event_type *events;
  25
  26 int perf_header__push_event(u64 id, const char *name)
  27 {
  28         if (strlen(name) > MAX_EVENT_NAME)
  29                 pr_warning("Event %s will be truncated\n", name);
  30
  31         if (!events) {
  32                 events = malloc(sizeof(struct perf_trace_event_type));
  33                 if (events == NULL)
  34                         return -ENOMEM;
  35         } else {
  36                 struct perf_trace_event_type *nevents;
  37
  38                 nevents = realloc(events, (event_count + 1) * sizeof(*events));
  39                 if (nevents == NULL)
  40                         return -ENOMEM;
  41                 events = nevents;
  42         }
  43         memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
  44         events[event_count].event_id = id;
  45         strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
  46         event_count++;
  47         return 0;
  48 }
  49
  50 char *perf_header__find_event(u64 id)
  51 {
  52         int i;
  53         for (i = 0 ; i < event_count; i++) {
  54                 if (events[i].event_id == id)
  55                         return events[i].name;
  56         }
  57         return NULL;
  58 }
  59
  60 static const char *__perf_magic = "PERFFILE";
  61
  62 #define PERF_MAGIC      (*(u64 *)__perf_magic)
  63
  64 struct perf_file_attr {
  65         struct perf_event_attr  attr;
  66         struct perf_file_section        ids;
  67 };
  68
  69 void perf_header__set_feat(struct perf_header *header, int feat)
  70 {
  71         set_bit(feat, header->adds_features);
  72 }
  73
  74 void perf_header__clear_feat(struct perf_header *header, int feat)
  75 {
  76         clear_bit(feat, header->adds_features);
  77 }
  78
  79 bool perf_header__has_feat(const struct perf_header *header, int feat)
  80 {
  81         return test_bit(feat, header->adds_features);
  82 }
  83
  84 static int do_write(int fd, const void *buf, size_t size)
  85 {
  86         while (size) {
  87                 int ret = write(fd, buf, size);
  88
  89                 if (ret < 0)
  90                         return -errno;
  91
  92                 size -= ret;
  93                 buf += ret;
  94         }
  95
  96         return 0;
  97 }
  98
  99 #define NAME_ALIGN 64
 100
 101 static int write_padded(int fd, const void *bf, size_t count,
 102                         size_t count_aligned)
 103 {
 104         static const char zero_buf[NAME_ALIGN];
 105         int err = do_write(fd, bf, count);
 106
 107         if (!err)
 108                 err = do_write(fd, zero_buf, count_aligned - count);
 109
 110         return err;
 111 }
 112
 113 #define dsos__for_each_with_build_id(pos, head) \
 114         list_for_each_entry(pos, head, node)    \
 115                 if (!pos->has_build_id)         \
 116                         continue;               \
 117                 else
 118
 119 static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
 120                                 u16 misc, int fd)
 121 {
 122         struct dso *pos;
 123
 124         dsos__for_each_with_build_id(pos, head) {
 125                 int err;
 126                 struct build_id_event b;
 127                 size_t len;
 128
 129                 if (!pos->hit)
 130                         continue;
 131                 len = pos->long_name_len + 1;
 132                 len = ALIGN(len, NAME_ALIGN);
 133                 memset(&b, 0, sizeof(b));
 134                 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
 135                 b.pid = pid;
 136                 b.header.misc = misc;
 137                 b.header.size = sizeof(b) + len;
 138                 err = do_write(fd, &b, sizeof(b));
 139                 if (err < 0)
 140                         return err;
 141                 err = write_padded(fd, pos->long_name,
 142                                    pos->long_name_len + 1, len);
 143                 if (err < 0)
 144                         return err;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static int machine__write_buildid_table(struct machine *machine, int fd)
 151 {
 152         int err;
 153         u16 kmisc = PERF_RECORD_MISC_KERNEL,
 154             umisc = PERF_RECORD_MISC_USER;
 155
 156         if (!machine__is_host(machine)) {
 157                 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
 158                 umisc = PERF_RECORD_MISC_GUEST_USER;
 159         }
 160
 161         err = __dsos__write_buildid_table(&machine->kernel_dsos, machine->pid,
 162                                           kmisc, fd);
 163         if (err == 0)
 164                 err = __dsos__write_buildid_table(&machine->user_dsos,
 165                                                   machine->pid, umisc, fd);
 166         return err;
 167 }
 168
 169 static int dsos__write_buildid_table(struct perf_header *header, int fd)
 170 {
 171         struct perf_session *session = container_of(header,
 172                         struct perf_session, header);
 173         struct rb_node *nd;
 174         int err = machine__write_buildid_table(&session->host_machine, fd);
 175
 176         if (err)
 177                 return err;
 178
 179         for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
 180                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 181                 err = machine__write_buildid_table(pos, fd);
 182                 if (err)
 183                         break;
 184         }
 185         return err;
 186 }
 187
 188 int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
 189                           const char *name, bool is_kallsyms)
 190 {
 191         const size_t size = PATH_MAX;
 192         char *realname, *filename = malloc(size),
 193              *linkname = malloc(size), *targetname;
 194         int len, err = -1;
 195
 196         if (is_kallsyms)
 197                 realname = (char *)name;
 198         else
 199                 realname = realpath(name, NULL);
 200
 201         if (realname == NULL || filename == NULL || linkname == NULL)
 202                 goto out_free;
 203
 204         len = snprintf(filename, size, "%s%s%s",
 205                        debugdir, is_kallsyms ? "/" : "", realname);
 206         if (mkdir_p(filename, 0755))
 207                 goto out_free;
 208
 209         snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
 210
 211         if (access(filename, F_OK)) {
 212                 if (is_kallsyms) {
 213                          if (copyfile("/proc/kallsyms", filename))
 214                                 goto out_free;
 215                 } else if (link(realname, filename) && copyfile(name, filename))
 216                         goto out_free;
 217         }
 218
 219         len = snprintf(linkname, size, "%s/.build-id/%.2s",
 220                        debugdir, sbuild_id);
 221
 222         if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
 223                 goto out_free;
 224
 225         snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
 226         targetname = filename + strlen(debugdir) - 5;
 227         memcpy(targetname, "../..", 5);
 228
 229         if (symlink(targetname, linkname) == 0)
 230                 err = 0;
 231 out_free:
 232         if (!is_kallsyms)
 233                 free(realname);
 234         free(filename);
 235         free(linkname);
 236         return err;
 237 }
 238
 239 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
 240                                  const char *name, const char *debugdir,
 241                                  bool is_kallsyms)
 242 {
 243         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 244
 245         build_id__sprintf(build_id, build_id_size, sbuild_id);
 246
 247         return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
 248 }
 249
 250 int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
 251 {
 252         const size_t size = PATH_MAX;
 253         char *filename = malloc(size),
 254              *linkname = malloc(size);
 255         int err = -1;
 256
 257         if (filename == NULL || linkname == NULL)
 258                 goto out_free;
 259
 260         snprintf(linkname, size, "%s/.build-id/%.2s/%s",
 261                  debugdir, sbuild_id, sbuild_id + 2);
 262
 263         if (access(linkname, F_OK))
 264                 goto out_free;
 265
 266         if (readlink(linkname, filename, size) < 0)
 267                 goto out_free;
 268
 269         if (unlink(linkname))
 270                 goto out_free;
 271
 272         /*
 273          * Since the link is relative, we must make it absolute:
 274          */
 275         snprintf(linkname, size, "%s/.build-id/%.2s/%s",
 276                  debugdir, sbuild_id, filename);
 277
 278         if (unlink(linkname))
 279                 goto out_free;
 280
 281         err = 0;
 282 out_free:
 283         free(filename);
 284         free(linkname);
 285         return err;
 286 }
 287
 288 static int dso__cache_build_id(struct dso *dso, const char *debugdir)
 289 {
 290         bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
 291
 292         return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id),
 293                                      dso->long_name, debugdir, is_kallsyms);
 294 }
 295
 296 static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
 297 {
 298         struct dso *pos;
 299         int err = 0;
 300
 301         dsos__for_each_with_build_id(pos, head)
 302                 if (dso__cache_build_id(pos, debugdir))
 303                         err = -1;
 304
 305         return err;
 306 }
 307
 308 static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
 309 {
 310         int ret = __dsos__cache_build_ids(&machine->kernel_dsos, debugdir);
 311         ret |= __dsos__cache_build_ids(&machine->user_dsos, debugdir);
 312         return ret;
 313 }
 314
 315 static int perf_session__cache_build_ids(struct perf_session *session)
 316 {
 317         struct rb_node *nd;
 318         int ret;
 319         char debugdir[PATH_MAX];
 320
 321         snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
 322
 323         if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
 324                 return -1;
 325
 326         ret = machine__cache_build_ids(&session->host_machine, debugdir);
 327
 328         for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
 329                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 330                 ret |= machine__cache_build_ids(pos, debugdir);
 331         }
 332         return ret ? -1 : 0;
 333 }
 334
 335 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
 336 {
 337         bool ret = __dsos__read_build_ids(&machine->kernel_dsos, with_hits);
 338         ret |= __dsos__read_build_ids(&machine->user_dsos, with_hits);
 339         return ret;
 340 }
 341
 342 static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
 343 {
 344         struct rb_node *nd;
 345         bool ret = machine__read_build_ids(&session->host_machine, with_hits);
 346
 347         for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
 348                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 349                 ret |= machine__read_build_ids(pos, with_hits);
 350         }
 351
 352         return ret;
 353 }
 354
 355 static int perf_header__adds_write(struct perf_header *header,
 356                                    struct perf_evlist *evlist, int fd)
 357 {
 358         int nr_sections;
 359         struct perf_session *session;
 360         struct perf_file_section *feat_sec;
 361         int sec_size;
 362         u64 sec_start;
 363         int idx = 0, err;
 364
 365         session = container_of(header, struct perf_session, header);
 366
 367         if (perf_header__has_feat(header, HEADER_BUILD_ID &&
 368             !perf_session__read_build_ids(session, true)))
 369                 perf_header__clear_feat(header, HEADER_BUILD_ID);
 370
 371         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
 372         if (!nr_sections)
 373                 return 0;
 374
 375         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 376         if (feat_sec == NULL)
 377                 return -ENOMEM;
 378
 379         sec_size = sizeof(*feat_sec) * nr_sections;
 380
 381         sec_start = header->data_offset + header->data_size;
 382         lseek(fd, sec_start + sec_size, SEEK_SET);
 383
 384         if (perf_header__has_feat(header, HEADER_TRACE_INFO)) {
 385                 struct perf_file_section *trace_sec;
 386
 387                 trace_sec = &feat_sec[idx++];
 388
 389                 /* Write trace info */
 390                 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
 391                 read_tracing_data(fd, &evlist->entries);
 392                 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
 393         }
 394
 395         if (perf_header__has_feat(header, HEADER_BUILD_ID)) {
 396                 struct perf_file_section *buildid_sec;
 397
 398                 buildid_sec = &feat_sec[idx++];
 399
 400                 /* Write build-ids */
 401                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
 402                 err = dsos__write_buildid_table(header, fd);
 403                 if (err < 0) {
 404                         pr_debug("failed to write buildid table\n");
 405                         goto out_free;
 406                 }
 407                 buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
 408                                           buildid_sec->offset;
 409                 if (!no_buildid_cache)
 410                         perf_session__cache_build_ids(session);
 411         }
 412
 413         lseek(fd, sec_start, SEEK_SET);
 414         err = do_write(fd, feat_sec, sec_size);
 415         if (err < 0)
 416                 pr_debug("failed to write feature section\n");
 417 out_free:
 418         free(feat_sec);
 419         return err;
 420 }
 421
 422 int perf_header__write_pipe(int fd)
 423 {
 424         struct perf_pipe_file_header f_header;
 425         int err;
 426
 427         f_header = (struct perf_pipe_file_header){
 428                 .magic     = PERF_MAGIC,
 429                 .size      = sizeof(f_header),
 430         };
 431
 432         err = do_write(fd, &f_header, sizeof(f_header));
 433         if (err < 0) {
 434                 pr_debug("failed to write perf pipe header\n");
 435                 return err;
 436         }
 437
 438         return 0;
 439 }
 440
 441 int perf_session__write_header(struct perf_session *session,
 442                                struct perf_evlist *evlist,
 443                                int fd, bool at_exit)
 444 {
 445         struct perf_file_header f_header;
 446         struct perf_file_attr   f_attr;
 447         struct perf_header *header = &session->header;
 448         struct perf_evsel *attr, *pair = NULL;
 449         int err;
 450
 451         lseek(fd, sizeof(f_header), SEEK_SET);
 452
 453         if (session->evlist != evlist)
 454                 pair = list_entry(session->evlist->entries.next, struct perf_evsel, node);
 455
 456         list_for_each_entry(attr, &evlist->entries, node) {
 457                 attr->id_offset = lseek(fd, 0, SEEK_CUR);
 458                 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
 459                 if (err < 0) {
 460 out_err_write:
 461                         pr_debug("failed to write perf header\n");
 462                         return err;
 463                 }
 464                 if (session->evlist != evlist) {
 465                         err = do_write(fd, pair->id, pair->ids * sizeof(u64));
 466                         if (err < 0)
 467                                 goto out_err_write;
 468                         attr->ids += pair->ids;
 469                         pair = list_entry(pair->node.next, struct perf_evsel, node);
 470                 }
 471         }
 472
 473         header->attr_offset = lseek(fd, 0, SEEK_CUR);
 474
 475         list_for_each_entry(attr, &evlist->entries, node) {
 476                 f_attr = (struct perf_file_attr){
 477                         .attr = attr->attr,
 478                         .ids  = {
 479                                 .offset = attr->id_offset,
 480                                 .size   = attr->ids * sizeof(u64),
 481                         }
 482                 };
 483                 err = do_write(fd, &f_attr, sizeof(f_attr));
 484                 if (err < 0) {
 485                         pr_debug("failed to write perf header attribute\n");
 486                         return err;
 487                 }
 488         }
 489
 490         header->event_offset = lseek(fd, 0, SEEK_CUR);
 491         header->event_size = event_count * sizeof(struct perf_trace_event_type);
 492         if (events) {
 493                 err = do_write(fd, events, header->event_size);
 494                 if (err < 0) {
 495                         pr_debug("failed to write perf header events\n");
 496                         return err;
 497                 }
 498         }
 499
 500         header->data_offset = lseek(fd, 0, SEEK_CUR);
 501
 502         if (at_exit) {
 503                 err = perf_header__adds_write(header, evlist, fd);
 504                 if (err < 0)
 505                         return err;
 506         }
 507
 508         f_header = (struct perf_file_header){
 509                 .magic     = PERF_MAGIC,
 510                 .size      = sizeof(f_header),
 511                 .attr_size = sizeof(f_attr),
 512                 .attrs = {
 513                         .offset = header->attr_offset,
 514                         .size   = evlist->nr_entries * sizeof(f_attr),
 515                 },
 516                 .data = {
 517                         .offset = header->data_offset,
 518                         .size   = header->data_size,
 519                 },
 520                 .event_types = {
 521                         .offset = header->event_offset,
 522                         .size   = header->event_size,
 523                 },
 524         };
 525
 526         memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
 527
 528         lseek(fd, 0, SEEK_SET);
 529         err = do_write(fd, &f_header, sizeof(f_header));
 530         if (err < 0) {
 531                 pr_debug("failed to write perf header\n");
 532                 return err;
 533         }
 534         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
 535
 536         header->frozen = 1;
 537         return 0;
 538 }
 539
 540 static int perf_header__getbuffer64(struct perf_header *header,
 541                                     int fd, void *buf, size_t size)
 542 {
 543         if (readn(fd, buf, size) <= 0)
 544                 return -1;
 545
 546         if (header->needs_swap)
 547                 mem_bswap_64(buf, size);
 548
 549         return 0;
 550 }
 551
 552 int perf_header__process_sections(struct perf_header *header, int fd,
 553                                   int (*process)(struct perf_file_section *section,
 554                                                  struct perf_header *ph,
 555                                                  int feat, int fd))
 556 {
 557         struct perf_file_section *feat_sec;
 558         int nr_sections;
 559         int sec_size;
 560         int idx = 0;
 561         int err = -1, feat = 1;
 562
 563         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
 564         if (!nr_sections)
 565                 return 0;
 566
 567         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 568         if (!feat_sec)
 569                 return -1;
 570
 571         sec_size = sizeof(*feat_sec) * nr_sections;
 572
 573         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
 574
 575         if (perf_header__getbuffer64(header, fd, feat_sec, sec_size))
 576                 goto out_free;
 577
 578         err = 0;
 579         while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
 580                 if (perf_header__has_feat(header, feat)) {
 581                         struct perf_file_section *sec = &feat_sec[idx++];
 582
 583                         err = process(sec, header, feat, fd);
 584                         if (err < 0)
 585                                 break;
 586                 }
 587                 ++feat;
 588         }
 589 out_free:
 590         free(feat_sec);
 591         return err;
 592 }
 593
 594 int perf_file_header__read(struct perf_file_header *header,
 595                            struct perf_header *ph, int fd)
 596 {
 597         lseek(fd, 0, SEEK_SET);
 598
 599         if (readn(fd, header, sizeof(*header)) <= 0 ||
 600             memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
 601                 return -1;
 602
 603         if (header->attr_size != sizeof(struct perf_file_attr)) {
 604                 u64 attr_size = bswap_64(header->attr_size);
 605
 606                 if (attr_size != sizeof(struct perf_file_attr))
 607                         return -1;
 608
 609                 mem_bswap_64(header, offsetof(struct perf_file_header,
 610                                             adds_features));
 611                 ph->needs_swap = true;
 612         }
 613
 614         if (header->size != sizeof(*header)) {
 615                 /* Support the previous format */
 616                 if (header->size == offsetof(typeof(*header), adds_features))
 617                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
 618                 else
 619                         return -1;
 620         }
 621
 622         memcpy(&ph->adds_features, &header->adds_features,
 623                sizeof(ph->adds_features));
 624         /*
 625          * FIXME: hack that assumes that if we need swap the perf.data file
 626          * may be coming from an arch with a different word-size, ergo different
 627          * DEFINE_BITMAP format, investigate more later, but for now its mostly
 628          * safe to assume that we have a build-id section. Trace files probably
 629          * have several other issues in this realm anyway...
 630          */
 631         if (ph->needs_swap) {
 632                 memset(&ph->adds_features, 0, sizeof(ph->adds_features));
 633                 perf_header__set_feat(ph, HEADER_BUILD_ID);
 634         }
 635
 636         ph->event_offset = header->event_types.offset;
 637         ph->event_size   = header->event_types.size;
 638         ph->data_offset  = header->data.offset;
 639         ph->data_size    = header->data.size;
 640         return 0;
 641 }
 642
 643 static int __event_process_build_id(struct build_id_event *bev,
 644                                     char *filename,
 645                                     struct perf_session *session)
 646 {
 647         int err = -1;
 648         struct list_head *head;
 649         struct machine *machine;
 650         u16 misc;
 651         struct dso *dso;
 652         enum dso_kernel_type dso_type;
 653
 654         machine = perf_session__findnew_machine(session, bev->pid);
 655         if (!machine)
 656                 goto out;
 657
 658         misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 659
 660         switch (misc) {
 661         case PERF_RECORD_MISC_KERNEL:
 662                 dso_type = DSO_TYPE_KERNEL;
 663                 head = &machine->kernel_dsos;
 664                 break;
 665         case PERF_RECORD_MISC_GUEST_KERNEL:
 666                 dso_type = DSO_TYPE_GUEST_KERNEL;
 667                 head = &machine->kernel_dsos;
 668                 break;
 669         case PERF_RECORD_MISC_USER:
 670         case PERF_RECORD_MISC_GUEST_USER:
 671                 dso_type = DSO_TYPE_USER;
 672                 head = &machine->user_dsos;
 673                 break;
 674         default:
 675                 goto out;
 676         }
 677
 678         dso = __dsos__findnew(head, filename);
 679         if (dso != NULL) {
 680                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 681
 682                 dso__set_build_id(dso, &bev->build_id);
 683
 684                 if (filename[0] == '[')
 685                         dso->kernel = dso_type;
 686
 687                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
 688                                   sbuild_id);
 689                 pr_debug("build id event received for %s: %s\n",
 690                          dso->long_name, sbuild_id);
 691         }
 692
 693         err = 0;
 694 out:
 695         return err;
 696 }
 697
 698 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
 699                                                  int input, u64 offset, u64 size)
 700 {
 701         struct perf_session *session = container_of(header, struct perf_session, header);
 702         struct {
 703                 struct perf_event_header   header;
 704                 u8                         build_id[ALIGN(BUILD_ID_SIZE, sizeof(u64))];
 705                 char                       filename[0];
 706         } old_bev;
 707         struct build_id_event bev;
 708         char filename[PATH_MAX];
 709         u64 limit = offset + size;
 710
 711         while (offset < limit) {
 712                 ssize_t len;
 713
 714                 if (read(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
 715                         return -1;
 716
 717                 if (header->needs_swap)
 718                         perf_event_header__bswap(&old_bev.header);
 719
 720                 len = old_bev.header.size - sizeof(old_bev);
 721                 if (read(input, filename, len) != len)
 722                         return -1;
 723
 724                 bev.header = old_bev.header;
 725                 bev.pid    = 0;
 726                 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
 727                 __event_process_build_id(&bev, filename, session);
 728
 729                 offset += bev.header.size;
 730         }
 731
 732         return 0;
 733 }
 734
 735 static int perf_header__read_build_ids(struct perf_header *header,
 736                                        int input, u64 offset, u64 size)
 737 {
 738         struct perf_session *session = container_of(header, struct perf_session, header);
 739         struct build_id_event bev;
 740         char filename[PATH_MAX];
 741         u64 limit = offset + size, orig_offset = offset;
 742         int err = -1;
 743
 744         while (offset < limit) {
 745                 ssize_t len;
 746
 747                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
 748                         goto out;
 749
 750                 if (header->needs_swap)
 751                         perf_event_header__bswap(&bev.header);
 752
 753                 len = bev.header.size - sizeof(bev);
 754                 if (read(input, filename, len) != len)
 755                         goto out;
 756                 /*
 757                  * The a1645ce1 changeset:
 758                  *
 759                  * "perf: 'perf kvm' tool for monitoring guest performance from host"
 760                  *
 761                  * Added a field to struct build_id_event that broke the file
 762                  * format.
 763                  *
 764                  * Since the kernel build-id is the first entry, process the
 765                  * table using the old format if the well known
 766                  * '[kernel.kallsyms]' string for the kernel build-id has the
 767                  * first 4 characters chopped off (where the pid_t sits).
 768                  */
 769                 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
 770                         if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
 771                                 return -1;
 772                         return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
 773                 }
 774
 775                 __event_process_build_id(&bev, filename, session);
 776
 777                 offset += bev.header.size;
 778         }
 779         err = 0;
 780 out:
 781         return err;
 782 }
 783
 784 static int perf_file_section__process(struct perf_file_section *section,
 785                                       struct perf_header *ph,
 786                                       int feat, int fd)
 787 {
 788         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
 789                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
 790                           "%d, continuing...\n", section->offset, feat);
 791                 return 0;
 792         }
 793
 794         switch (feat) {
 795         case HEADER_TRACE_INFO:
 796                 trace_report(fd, false);
 797                 break;
 798
 799         case HEADER_BUILD_ID:
 800                 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
 801                         pr_debug("Failed to read buildids, continuing...\n");
 802                 break;
 803         default:
 804                 pr_debug("unknown feature %d, continuing...\n", feat);
 805         }
 806
 807         return 0;
 808 }
 809
 810 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
 811                                        struct perf_header *ph, int fd,
 812                                        bool repipe)
 813 {
 814         if (readn(fd, header, sizeof(*header)) <= 0 ||
 815             memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
 816                 return -1;
 817
 818         if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
 819                 return -1;
 820
 821         if (header->size != sizeof(*header)) {
 822                 u64 size = bswap_64(header->size);
 823
 824                 if (size != sizeof(*header))
 825                         return -1;
 826
 827                 ph->needs_swap = true;
 828         }
 829
 830         return 0;
 831 }
 832
 833 static int perf_header__read_pipe(struct perf_session *session, int fd)
 834 {
 835         struct perf_header *header = &session->header;
 836         struct perf_pipe_file_header f_header;
 837
 838         if (perf_file_header__read_pipe(&f_header, header, fd,
 839                                         session->repipe) < 0) {
 840                 pr_debug("incompatible file format\n");
 841                 return -EINVAL;
 842         }
 843
 844         session->fd = fd;
 845
 846         return 0;
 847 }
 848
 849 int perf_session__read_header(struct perf_session *session, int fd)
 850 {
 851         struct perf_header *header = &session->header;
 852         struct perf_file_header f_header;
 853         struct perf_file_attr   f_attr;
 854         u64                     f_id;
 855         int nr_attrs, nr_ids, i, j;
 856
 857         session->evlist = perf_evlist__new(NULL, NULL);
 858         if (session->evlist == NULL)
 859                 return -ENOMEM;
 860
 861         if (session->fd_pipe)
 862                 return perf_header__read_pipe(session, fd);
 863
 864         if (perf_file_header__read(&f_header, header, fd) < 0) {
 865                 pr_debug("incompatible file format\n");
 866                 return -EINVAL;
 867         }
 868
 869         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 870         lseek(fd, f_header.attrs.offset, SEEK_SET);
 871
 872         for (i = 0; i < nr_attrs; i++) {
 873                 struct perf_evsel *evsel;
 874                 off_t tmp;
 875
 876                 if (perf_header__getbuffer64(header, fd, &f_attr, sizeof(f_attr)))
 877                         goto out_errno;
 878
 879                 tmp = lseek(fd, 0, SEEK_CUR);
 880                 evsel = perf_evsel__new(&f_attr.attr, i);
 881
 882                 if (evsel == NULL)
 883                         goto out_delete_evlist;
 884                 /*
 885                  * Do it before so that if perf_evsel__alloc_id fails, this
 886                  * entry gets purged too at perf_evlist__delete().
 887                  */
 888                 perf_evlist__add(session->evlist, evsel);
 889
 890                 nr_ids = f_attr.ids.size / sizeof(u64);
 891                 /*
 892                  * We don't have the cpu and thread maps on the header, so
 893                  * for allocating the perf_sample_id table we fake 1 cpu and
 894                  * hattr->ids threads.
 895                  */
 896                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
 897                         goto out_delete_evlist;
 898
 899                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 900
 901                 for (j = 0; j < nr_ids; j++) {
 902                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
 903                                 goto out_errno;
 904
 905                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
 906                 }
 907
 908                 lseek(fd, tmp, SEEK_SET);
 909         }
 910
 911         if (f_header.event_types.size) {
 912                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 913                 events = malloc(f_header.event_types.size);
 914                 if (events == NULL)
 915                         return -ENOMEM;
 916                 if (perf_header__getbuffer64(header, fd, events,
 917                                              f_header.event_types.size))
 918                         goto out_errno;
 919                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 920         }
 921
 922         perf_header__process_sections(header, fd, perf_file_section__process);
 923
 924         lseek(fd, header->data_offset, SEEK_SET);
 925
 926         header->frozen = 1;
 927         return 0;
 928 out_errno:
 929         return -errno;
 930
 931 out_delete_evlist:
 932         perf_evlist__delete(session->evlist);
 933         session->evlist = NULL;
 934         return -ENOMEM;
 935 }
 936
 937 int perf_event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
 938                                 perf_event__handler_t process,
 939                                 struct perf_session *session)
 940 {
 941         union perf_event *ev;
 942         size_t size;
 943         int err;
 944
 945         size = sizeof(struct perf_event_attr);
 946         size = ALIGN(size, sizeof(u64));
 947         size += sizeof(struct perf_event_header);
 948         size += ids * sizeof(u64);
 949
 950         ev = malloc(size);
 951
 952         if (ev == NULL)
 953                 return -ENOMEM;
 954
 955         ev->attr.attr = *attr;
 956         memcpy(ev->attr.id, id, ids * sizeof(u64));
 957
 958         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
 959         ev->attr.header.size = size;
 960
 961         err = process(ev, NULL, session);
 962
 963         free(ev);
 964
 965         return err;
 966 }
 967
 968 int perf_session__synthesize_attrs(struct perf_session *session,
 969                                    perf_event__handler_t process)
 970 {
 971         struct perf_evsel *attr;
 972         int err = 0;
 973
 974         list_for_each_entry(attr, &session->evlist->entries, node) {
 975                 err = perf_event__synthesize_attr(&attr->attr, attr->ids,
 976                                                   attr->id, process, session);
 977                 if (err) {
 978                         pr_debug("failed to create perf header attribute\n");
 979                         return err;
 980                 }
 981         }
 982
 983         return err;
 984 }
 985
 986 int perf_event__process_attr(union perf_event *event,
 987                              struct perf_session *session)
 988 {
 989         unsigned int i, ids, n_ids;
 990         struct perf_evsel *evsel;
 991
 992         if (session->evlist == NULL) {
 993                 session->evlist = perf_evlist__new(NULL, NULL);
 994                 if (session->evlist == NULL)
 995                         return -ENOMEM;
 996         }
 997
 998         evsel = perf_evsel__new(&event->attr.attr,
 999                                 session->evlist->nr_entries);
1000         if (evsel == NULL)
1001                 return -ENOMEM;
1002
1003         perf_evlist__add(session->evlist, evsel);
1004
1005         ids = event->header.size;
1006         ids -= (void *)&event->attr.id - (void *)event;
1007         n_ids = ids / sizeof(u64);
1008         /*
1009          * We don't have the cpu and thread maps on the header, so
1010          * for allocating the perf_sample_id table we fake 1 cpu and
1011          * hattr->ids threads.
1012          */
1013         if (perf_evsel__alloc_id(evsel, 1, n_ids))
1014                 return -ENOMEM;
1015
1016         for (i = 0; i < n_ids; i++) {
1017                 perf_evlist__id_add(session->evlist, evsel, 0, i,
1018                                     event->attr.id[i]);
1019         }
1020
1021         perf_session__update_sample_type(session);
1022
1023         return 0;
1024 }
1025
1026 int perf_event__synthesize_event_type(u64 event_id, char *name,
1027                                       perf_event__handler_t process,
1028                                       struct perf_session *session)
1029 {
1030         union perf_event ev;
1031         size_t size = 0;
1032         int err = 0;
1033
1034         memset(&ev, 0, sizeof(ev));
1035
1036         ev.event_type.event_type.event_id = event_id;
1037         memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
1038         strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
1039
1040         ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
1041         size = strlen(name);
1042         size = ALIGN(size, sizeof(u64));
1043         ev.event_type.header.size = sizeof(ev.event_type) -
1044                 (sizeof(ev.event_type.event_type.name) - size);
1045
1046         err = process(&ev, NULL, session);
1047
1048         return err;
1049 }
1050
1051 int perf_event__synthesize_event_types(perf_event__handler_t process,
1052                                        struct perf_session *session)
1053 {
1054         struct perf_trace_event_type *type;
1055         int i, err = 0;
1056
1057         for (i = 0; i < event_count; i++) {
1058                 type = &events[i];
1059
1060                 err = perf_event__synthesize_event_type(type->event_id,
1061                                                         type->name, process,
1062                                                         session);
1063                 if (err) {
1064                         pr_debug("failed to create perf header event type\n");
1065                         return err;
1066                 }
1067         }
1068
1069         return err;
1070 }
1071
1072 int perf_event__process_event_type(union perf_event *event,
1073                                    struct perf_session *session __unused)
1074 {
1075         if (perf_header__push_event(event->event_type.event_type.event_id,
1076                                     event->event_type.event_type.name) < 0)
1077                 return -ENOMEM;
1078
1079         return 0;
1080 }
1081
1082 int perf_event__synthesize_tracing_data(int fd, struct perf_evlist *evlist,
1083                                          perf_event__handler_t process,
1084                                    struct perf_session *session __unused)
1085 {
1086         union perf_event ev;
1087         ssize_t size = 0, aligned_size = 0, padding;
1088         int err __used = 0;
1089
1090         memset(&ev, 0, sizeof(ev));
1091
1092         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1093         size = read_tracing_data_size(fd, &evlist->entries);
1094         if (size <= 0)
1095                 return size;
1096         aligned_size = ALIGN(size, sizeof(u64));
1097         padding = aligned_size - size;
1098         ev.tracing_data.header.size = sizeof(ev.tracing_data);
1099         ev.tracing_data.size = aligned_size;
1100
1101         process(&ev, NULL, session);
1102
1103         err = read_tracing_data(fd, &evlist->entries);
1104         write_padded(fd, NULL, 0, padding);
1105
1106         return aligned_size;
1107 }
1108
1109 int perf_event__process_tracing_data(union perf_event *event,
1110                                      struct perf_session *session)
1111 {
1112         ssize_t size_read, padding, size = event->tracing_data.size;
1113         off_t offset = lseek(session->fd, 0, SEEK_CUR);
1114         char buf[BUFSIZ];
1115
1116         /* setup for reading amidst mmap */
1117         lseek(session->fd, offset + sizeof(struct tracing_data_event),
1118               SEEK_SET);
1119
1120         size_read = trace_report(session->fd, session->repipe);
1121
1122         padding = ALIGN(size_read, sizeof(u64)) - size_read;
1123
1124         if (read(session->fd, buf, padding) < 0)
1125                 die("reading input file");
1126         if (session->repipe) {
1127                 int retw = write(STDOUT_FILENO, buf, padding);
1128                 if (retw <= 0 || retw != padding)
1129                         die("repiping tracing data padding");
1130         }
1131
1132         if (size_read + padding != size)
1133                 die("tracing data size mismatch");
1134
1135         return size_read + padding;
1136 }
1137
1138 int perf_event__synthesize_build_id(struct dso *pos, u16 misc,
1139                                     perf_event__handler_t process,
1140                                     struct machine *machine,
1141                                     struct perf_session *session)
1142 {
1143         union perf_event ev;
1144         size_t len;
1145         int err = 0;
1146
1147         if (!pos->hit)
1148                 return err;
1149
1150         memset(&ev, 0, sizeof(ev));
1151
1152         len = pos->long_name_len + 1;
1153         len = ALIGN(len, NAME_ALIGN);
1154         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1155         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1156         ev.build_id.header.misc = misc;
1157         ev.build_id.pid = machine->pid;
1158         ev.build_id.header.size = sizeof(ev.build_id) + len;
1159         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1160
1161         err = process(&ev, NULL, session);
1162
1163         return err;
1164 }
1165
1166 int perf_event__process_build_id(union perf_event *event,
1167                                  struct perf_session *session)
1168 {
1169         __event_process_build_id(&event->build_id,
1170                                  event->build_id.filename,
1171                                  session);
1172         return 0;
1173 }
1174
1175 void disable_buildid_cache(void)
1176 {
1177         no_buildid_cache = true;
1178 }