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(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 build_id_event bev;
 703         char filename[PATH_MAX];
 704         u64 limit = offset + size;
 705         int err = -1;
 706
 707         while (offset < limit) {
 708                 ssize_t len;
 709
 710                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
 711                         goto out;
 712
 713                 if (header->needs_swap)
 714                         perf_event_header__bswap(&bev.header);
 715
 716                 len = bev.header.size - sizeof(bev);
 717                 if (read(input, filename, len) != len)
 718                         goto out;
 719
 720                 __event_process_build_id(&bev, filename, session);
 721
 722                 offset += bev.header.size;
 723         }
 724         err = 0;
 725 out:
 726         return err;
 727 }
 728
 729 static int perf_file_section__process(struct perf_file_section *section,
 730                                       struct perf_header *ph,
 731                                       int feat, int fd)
 732 {
 733         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
 734                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
 735                           "%d, continuing...\n", section->offset, feat);
 736                 return 0;
 737         }
 738
 739         switch (feat) {
 740         case HEADER_TRACE_INFO:
 741                 trace_report(fd, false);
 742                 break;
 743
 744         case HEADER_BUILD_ID:
 745                 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
 746                         pr_debug("Failed to read buildids, continuing...\n");
 747                 break;
 748         default:
 749                 pr_debug("unknown feature %d, continuing...\n", feat);
 750         }
 751
 752         return 0;
 753 }
 754
 755 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
 756                                        struct perf_header *ph, int fd,
 757                                        bool repipe)
 758 {
 759         if (readn(fd, header, sizeof(*header)) <= 0 ||
 760             memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
 761                 return -1;
 762
 763         if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
 764                 return -1;
 765
 766         if (header->size != sizeof(*header)) {
 767                 u64 size = bswap_64(header->size);
 768
 769                 if (size != sizeof(*header))
 770                         return -1;
 771
 772                 ph->needs_swap = true;
 773         }
 774
 775         return 0;
 776 }
 777
 778 static int perf_header__read_pipe(struct perf_session *session, int fd)
 779 {
 780         struct perf_header *header = &session->header;
 781         struct perf_pipe_file_header f_header;
 782
 783         if (perf_file_header__read_pipe(&f_header, header, fd,
 784                                         session->repipe) < 0) {
 785                 pr_debug("incompatible file format\n");
 786                 return -EINVAL;
 787         }
 788
 789         session->fd = fd;
 790
 791         return 0;
 792 }
 793
 794 int perf_session__read_header(struct perf_session *session, int fd)
 795 {
 796         struct perf_header *header = &session->header;
 797         struct perf_file_header f_header;
 798         struct perf_file_attr   f_attr;
 799         u64                     f_id;
 800         int nr_attrs, nr_ids, i, j;
 801
 802         session->evlist = perf_evlist__new(NULL, NULL);
 803         if (session->evlist == NULL)
 804                 return -ENOMEM;
 805
 806         if (session->fd_pipe)
 807                 return perf_header__read_pipe(session, fd);
 808
 809         if (perf_file_header__read(&f_header, header, fd) < 0) {
 810                 pr_debug("incompatible file format\n");
 811                 return -EINVAL;
 812         }
 813
 814         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 815         lseek(fd, f_header.attrs.offset, SEEK_SET);
 816
 817         for (i = 0; i < nr_attrs; i++) {
 818                 struct perf_evsel *evsel;
 819                 off_t tmp;
 820
 821                 if (perf_header__getbuffer64(header, fd, &f_attr, sizeof(f_attr)))
 822                         goto out_errno;
 823
 824                 tmp = lseek(fd, 0, SEEK_CUR);
 825                 evsel = perf_evsel__new(&f_attr.attr, i);
 826
 827                 if (evsel == NULL)
 828                         goto out_delete_evlist;
 829                 /*
 830                  * Do it before so that if perf_evsel__alloc_id fails, this
 831                  * entry gets purged too at perf_evlist__delete().
 832                  */
 833                 perf_evlist__add(session->evlist, evsel);
 834
 835                 nr_ids = f_attr.ids.size / sizeof(u64);
 836                 /*
 837                  * We don't have the cpu and thread maps on the header, so
 838                  * for allocating the perf_sample_id table we fake 1 cpu and
 839                  * hattr->ids threads.
 840                  */
 841                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
 842                         goto out_delete_evlist;
 843
 844                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 845
 846                 for (j = 0; j < nr_ids; j++) {
 847                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
 848                                 goto out_errno;
 849
 850                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
 851                 }
 852
 853                 lseek(fd, tmp, SEEK_SET);
 854         }
 855
 856         if (f_header.event_types.size) {
 857                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 858                 events = malloc(f_header.event_types.size);
 859                 if (events == NULL)
 860                         return -ENOMEM;
 861                 if (perf_header__getbuffer64(header, fd, events,
 862                                              f_header.event_types.size))
 863                         goto out_errno;
 864                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 865         }
 866
 867         perf_header__process_sections(header, fd, perf_file_section__process);
 868
 869         lseek(fd, header->data_offset, SEEK_SET);
 870
 871         header->frozen = 1;
 872         return 0;
 873 out_errno:
 874         return -errno;
 875
 876 out_delete_evlist:
 877         perf_evlist__delete(session->evlist);
 878         session->evlist = NULL;
 879         return -ENOMEM;
 880 }
 881
 882 u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 883 {
 884         struct perf_evsel *pos;
 885         u64 type = 0;
 886
 887         list_for_each_entry(pos, &evlist->entries, node) {
 888                 if (!type)
 889                         type = pos->attr.sample_type;
 890                 else if (type != pos->attr.sample_type)
 891                         die("non matching sample_type");
 892         }
 893
 894         return type;
 895 }
 896
 897 bool perf_evlist__sample_id_all(const struct perf_evlist *evlist)
 898 {
 899         bool value = false, first = true;
 900         struct perf_evsel *pos;
 901
 902         list_for_each_entry(pos, &evlist->entries, node) {
 903                 if (first) {
 904                         value = pos->attr.sample_id_all;
 905                         first = false;
 906                 } else if (value != pos->attr.sample_id_all)
 907                         die("non matching sample_id_all");
 908         }
 909
 910         return value;
 911 }
 912
 913 int perf_event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
 914                                 perf_event__handler_t process,
 915                                 struct perf_session *session)
 916 {
 917         union perf_event *ev;
 918         size_t size;
 919         int err;
 920
 921         size = sizeof(struct perf_event_attr);
 922         size = ALIGN(size, sizeof(u64));
 923         size += sizeof(struct perf_event_header);
 924         size += ids * sizeof(u64);
 925
 926         ev = malloc(size);
 927
 928         if (ev == NULL)
 929                 return -ENOMEM;
 930
 931         ev->attr.attr = *attr;
 932         memcpy(ev->attr.id, id, ids * sizeof(u64));
 933
 934         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
 935         ev->attr.header.size = size;
 936
 937         err = process(ev, NULL, session);
 938
 939         free(ev);
 940
 941         return err;
 942 }
 943
 944 int perf_session__synthesize_attrs(struct perf_session *session,
 945                                    perf_event__handler_t process)
 946 {
 947         struct perf_evsel *attr;
 948         int err = 0;
 949
 950         list_for_each_entry(attr, &session->evlist->entries, node) {
 951                 err = perf_event__synthesize_attr(&attr->attr, attr->ids,
 952                                                   attr->id, process, session);
 953                 if (err) {
 954                         pr_debug("failed to create perf header attribute\n");
 955                         return err;
 956                 }
 957         }
 958
 959         return err;
 960 }
 961
 962 int perf_event__process_attr(union perf_event *event,
 963                              struct perf_session *session)
 964 {
 965         unsigned int i, ids, n_ids;
 966         struct perf_evsel *evsel;
 967
 968         if (session->evlist == NULL) {
 969                 session->evlist = perf_evlist__new(NULL, NULL);
 970                 if (session->evlist == NULL)
 971                         return -ENOMEM;
 972         }
 973
 974         evsel = perf_evsel__new(&event->attr.attr,
 975                                 session->evlist->nr_entries);
 976         if (evsel == NULL)
 977                 return -ENOMEM;
 978
 979         perf_evlist__add(session->evlist, evsel);
 980
 981         ids = event->header.size;
 982         ids -= (void *)&event->attr.id - (void *)event;
 983         n_ids = ids / sizeof(u64);
 984         /*
 985          * We don't have the cpu and thread maps on the header, so
 986          * for allocating the perf_sample_id table we fake 1 cpu and
 987          * hattr->ids threads.
 988          */
 989         if (perf_evsel__alloc_id(evsel, 1, n_ids))
 990                 return -ENOMEM;
 991
 992         for (i = 0; i < n_ids; i++) {
 993                 perf_evlist__id_add(session->evlist, evsel, 0, i,
 994                                     event->attr.id[i]);
 995         }
 996
 997         perf_session__update_sample_type(session);
 998
 999         return 0;
1000 }
1001
1002 int perf_event__synthesize_event_type(u64 event_id, char *name,
1003                                       perf_event__handler_t process,
1004                                       struct perf_session *session)
1005 {
1006         union perf_event ev;
1007         size_t size = 0;
1008         int err = 0;
1009
1010         memset(&ev, 0, sizeof(ev));
1011
1012         ev.event_type.event_type.event_id = event_id;
1013         memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
1014         strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
1015
1016         ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
1017         size = strlen(name);
1018         size = ALIGN(size, sizeof(u64));
1019         ev.event_type.header.size = sizeof(ev.event_type) -
1020                 (sizeof(ev.event_type.event_type.name) - size);
1021
1022         err = process(&ev, NULL, session);
1023
1024         return err;
1025 }
1026
1027 int perf_event__synthesize_event_types(perf_event__handler_t process,
1028                                        struct perf_session *session)
1029 {
1030         struct perf_trace_event_type *type;
1031         int i, err = 0;
1032
1033         for (i = 0; i < event_count; i++) {
1034                 type = &events[i];
1035
1036                 err = perf_event__synthesize_event_type(type->event_id,
1037                                                         type->name, process,
1038                                                         session);
1039                 if (err) {
1040                         pr_debug("failed to create perf header event type\n");
1041                         return err;
1042                 }
1043         }
1044
1045         return err;
1046 }
1047
1048 int perf_event__process_event_type(union perf_event *event,
1049                                    struct perf_session *session __unused)
1050 {
1051         if (perf_header__push_event(event->event_type.event_type.event_id,
1052                                     event->event_type.event_type.name) < 0)
1053                 return -ENOMEM;
1054
1055         return 0;
1056 }
1057
1058 int perf_event__synthesize_tracing_data(int fd, struct perf_evlist *evlist,
1059                                          perf_event__handler_t process,
1060                                    struct perf_session *session __unused)
1061 {
1062         union perf_event ev;
1063         ssize_t size = 0, aligned_size = 0, padding;
1064         int err __used = 0;
1065
1066         memset(&ev, 0, sizeof(ev));
1067
1068         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1069         size = read_tracing_data_size(fd, &evlist->entries);
1070         if (size <= 0)
1071                 return size;
1072         aligned_size = ALIGN(size, sizeof(u64));
1073         padding = aligned_size - size;
1074         ev.tracing_data.header.size = sizeof(ev.tracing_data);
1075         ev.tracing_data.size = aligned_size;
1076
1077         process(&ev, NULL, session);
1078
1079         err = read_tracing_data(fd, &evlist->entries);
1080         write_padded(fd, NULL, 0, padding);
1081
1082         return aligned_size;
1083 }
1084
1085 int perf_event__process_tracing_data(union perf_event *event,
1086                                      struct perf_session *session)
1087 {
1088         ssize_t size_read, padding, size = event->tracing_data.size;
1089         off_t offset = lseek(session->fd, 0, SEEK_CUR);
1090         char buf[BUFSIZ];
1091
1092         /* setup for reading amidst mmap */
1093         lseek(session->fd, offset + sizeof(struct tracing_data_event),
1094               SEEK_SET);
1095
1096         size_read = trace_report(session->fd, session->repipe);
1097
1098         padding = ALIGN(size_read, sizeof(u64)) - size_read;
1099
1100         if (read(session->fd, buf, padding) < 0)
1101                 die("reading input file");
1102         if (session->repipe) {
1103                 int retw = write(STDOUT_FILENO, buf, padding);
1104                 if (retw <= 0 || retw != padding)
1105                         die("repiping tracing data padding");
1106         }
1107
1108         if (size_read + padding != size)
1109                 die("tracing data size mismatch");
1110
1111         return size_read + padding;
1112 }
1113
1114 int perf_event__synthesize_build_id(struct dso *pos, u16 misc,
1115                                     perf_event__handler_t process,
1116                                     struct machine *machine,
1117                                     struct perf_session *session)
1118 {
1119         union perf_event ev;
1120         size_t len;
1121         int err = 0;
1122
1123         if (!pos->hit)
1124                 return err;
1125
1126         memset(&ev, 0, sizeof(ev));
1127
1128         len = pos->long_name_len + 1;
1129         len = ALIGN(len, NAME_ALIGN);
1130         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1131         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1132         ev.build_id.header.misc = misc;
1133         ev.build_id.pid = machine->pid;
1134         ev.build_id.header.size = sizeof(ev.build_id) + len;
1135         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1136
1137         err = process(&ev, NULL, session);
1138
1139         return err;
1140 }
1141
1142 int perf_event__process_build_id(union perf_event *event,
1143                                  struct perf_session *session)
1144 {
1145         __event_process_build_id(&event->build_id,
1146                                  event->build_id.filename,
1147                                  session);
1148         return 0;
1149 }
1150
1151 void disable_buildid_cache(void)
1152 {
1153         no_buildid_cache = true;
1154 }