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 "util.h"
  12 #include "header.h"
  13 #include "../perf.h"
  14 #include "trace-event.h"
  15 #include "session.h"
  16 #include "symbol.h"
  17 #include "debug.h"
  18
  19 static bool no_buildid_cache = false;
  20
  21 /*
  22  * Create new perf.data header attribute:
  23  */
  24 struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
  25 {
  26         struct perf_header_attr *self = malloc(sizeof(*self));
  27
  28         if (self != NULL) {
  29                 self->attr = *attr;
  30                 self->ids  = 0;
  31                 self->size = 1;
  32                 self->id   = malloc(sizeof(u64));
  33                 if (self->id == NULL) {
  34                         free(self);
  35                         self = NULL;
  36                 }
  37         }
  38
  39         return self;
  40 }
  41
  42 void perf_header_attr__delete(struct perf_header_attr *self)
  43 {
  44         free(self->id);
  45         free(self);
  46 }
  47
  48 int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
  49 {
  50         int pos = self->ids;
  51
  52         self->ids++;
  53         if (self->ids > self->size) {
  54                 int nsize = self->size * 2;
  55                 u64 *nid = realloc(self->id, nsize * sizeof(u64));
  56
  57                 if (nid == NULL)
  58                         return -1;
  59
  60                 self->size = nsize;
  61                 self->id = nid;
  62         }
  63         self->id[pos] = id;
  64         return 0;
  65 }
  66
  67 int perf_header__init(struct perf_header *self)
  68 {
  69         self->size = 1;
  70         self->attr = malloc(sizeof(void *));
  71         return self->attr == NULL ? -ENOMEM : 0;
  72 }
  73
  74 void perf_header__exit(struct perf_header *self)
  75 {
  76         int i;
  77         for (i = 0; i < self->attrs; ++i)
  78                 perf_header_attr__delete(self->attr[i]);
  79         free(self->attr);
  80 }
  81
  82 int perf_header__add_attr(struct perf_header *self,
  83                           struct perf_header_attr *attr)
  84 {
  85         if (self->frozen)
  86                 return -1;
  87
  88         if (self->attrs == self->size) {
  89                 int nsize = self->size * 2;
  90                 struct perf_header_attr **nattr;
  91
  92                 nattr = realloc(self->attr, nsize * sizeof(void *));
  93                 if (nattr == NULL)
  94                         return -1;
  95
  96                 self->size = nsize;
  97                 self->attr = nattr;
  98         }
  99
 100         self->attr[self->attrs++] = attr;
 101         return 0;
 102 }
 103
 104 static int event_count;
 105 static struct perf_trace_event_type *events;
 106
 107 int perf_header__push_event(u64 id, const char *name)
 108 {
 109         if (strlen(name) > MAX_EVENT_NAME)
 110                 pr_warning("Event %s will be truncated\n", name);
 111
 112         if (!events) {
 113                 events = malloc(sizeof(struct perf_trace_event_type));
 114                 if (events == NULL)
 115                         return -ENOMEM;
 116         } else {
 117                 struct perf_trace_event_type *nevents;
 118
 119                 nevents = realloc(events, (event_count + 1) * sizeof(*events));
 120                 if (nevents == NULL)
 121                         return -ENOMEM;
 122                 events = nevents;
 123         }
 124         memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
 125         events[event_count].event_id = id;
 126         strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
 127         event_count++;
 128         return 0;
 129 }
 130
 131 char *perf_header__find_event(u64 id)
 132 {
 133         int i;
 134         for (i = 0 ; i < event_count; i++) {
 135                 if (events[i].event_id == id)
 136                         return events[i].name;
 137         }
 138         return NULL;
 139 }
 140
 141 static const char *__perf_magic = "PERFFILE";
 142
 143 #define PERF_MAGIC      (*(u64 *)__perf_magic)
 144
 145 struct perf_file_attr {
 146         struct perf_event_attr  attr;
 147         struct perf_file_section        ids;
 148 };
 149
 150 void perf_header__set_feat(struct perf_header *self, int feat)
 151 {
 152         set_bit(feat, self->adds_features);
 153 }
 154
 155 bool perf_header__has_feat(const struct perf_header *self, int feat)
 156 {
 157         return test_bit(feat, self->adds_features);
 158 }
 159
 160 static int do_write(int fd, const void *buf, size_t size)
 161 {
 162         while (size) {
 163                 int ret = write(fd, buf, size);
 164
 165                 if (ret < 0)
 166                         return -errno;
 167
 168                 size -= ret;
 169                 buf += ret;
 170         }
 171
 172         return 0;
 173 }
 174
 175 #define NAME_ALIGN 64
 176
 177 static int write_padded(int fd, const void *bf, size_t count,
 178                         size_t count_aligned)
 179 {
 180         static const char zero_buf[NAME_ALIGN];
 181         int err = do_write(fd, bf, count);
 182
 183         if (!err)
 184                 err = do_write(fd, zero_buf, count_aligned - count);
 185
 186         return err;
 187 }
 188
 189 #define dsos__for_each_with_build_id(pos, head) \
 190         list_for_each_entry(pos, head, node)    \
 191                 if (!pos->has_build_id)         \
 192                         continue;               \
 193                 else
 194
 195 static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
 196                                 u16 misc, int fd)
 197 {
 198         struct dso *pos;
 199
 200         dsos__for_each_with_build_id(pos, head) {
 201                 int err;
 202                 struct build_id_event b;
 203                 size_t len;
 204
 205                 if (!pos->hit)
 206                         continue;
 207                 len = pos->long_name_len + 1;
 208                 len = ALIGN(len, NAME_ALIGN);
 209                 memset(&b, 0, sizeof(b));
 210                 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
 211                 b.pid = pid;
 212                 b.header.misc = misc;
 213                 b.header.size = sizeof(b) + len;
 214                 err = do_write(fd, &b, sizeof(b));
 215                 if (err < 0)
 216                         return err;
 217                 err = write_padded(fd, pos->long_name,
 218                                    pos->long_name_len + 1, len);
 219                 if (err < 0)
 220                         return err;
 221         }
 222
 223         return 0;
 224 }
 225
 226 static int machine__write_buildid_table(struct machine *self, int fd)
 227 {
 228         int err;
 229         u16 kmisc = PERF_RECORD_MISC_KERNEL,
 230             umisc = PERF_RECORD_MISC_USER;
 231
 232         if (!machine__is_host(self)) {
 233                 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
 234                 umisc = PERF_RECORD_MISC_GUEST_USER;
 235         }
 236
 237         err = __dsos__write_buildid_table(&self->kernel_dsos, self->pid,
 238                                           kmisc, fd);
 239         if (err == 0)
 240                 err = __dsos__write_buildid_table(&self->user_dsos,
 241                                                   self->pid, umisc, fd);
 242         return err;
 243 }
 244
 245 static int dsos__write_buildid_table(struct perf_header *header, int fd)
 246 {
 247         struct perf_session *session = container_of(header,
 248                         struct perf_session, header);
 249         struct rb_node *nd;
 250         int err = machine__write_buildid_table(&session->host_machine, fd);
 251
 252         if (err)
 253                 return err;
 254
 255         for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
 256                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 257                 err = machine__write_buildid_table(pos, fd);
 258                 if (err)
 259                         break;
 260         }
 261         return err;
 262 }
 263
 264 int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
 265                           const char *name, bool is_kallsyms)
 266 {
 267         const size_t size = PATH_MAX;
 268         char *filename = malloc(size),
 269              *linkname = malloc(size), *targetname;
 270         int len, err = -1;
 271
 272         if (filename == NULL || linkname == NULL)
 273                 goto out_free;
 274
 275         len = snprintf(filename, size, "%s%s%s",
 276                        debugdir, is_kallsyms ? "/" : "", name);
 277         if (mkdir_p(filename, 0755))
 278                 goto out_free;
 279
 280         snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
 281
 282         if (access(filename, F_OK)) {
 283                 if (is_kallsyms) {
 284                          if (copyfile("/proc/kallsyms", filename))
 285                                 goto out_free;
 286                 } else if (link(name, filename) && copyfile(name, filename))
 287                         goto out_free;
 288         }
 289
 290         len = snprintf(linkname, size, "%s/.build-id/%.2s",
 291                        debugdir, sbuild_id);
 292
 293         if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
 294                 goto out_free;
 295
 296         snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
 297         targetname = filename + strlen(debugdir) - 5;
 298         memcpy(targetname, "../..", 5);
 299
 300         if (symlink(targetname, linkname) == 0)
 301                 err = 0;
 302 out_free:
 303         free(filename);
 304         free(linkname);
 305         return err;
 306 }
 307
 308 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
 309                                  const char *name, const char *debugdir,
 310                                  bool is_kallsyms)
 311 {
 312         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 313
 314         build_id__sprintf(build_id, build_id_size, sbuild_id);
 315
 316         return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
 317 }
 318
 319 int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
 320 {
 321         const size_t size = PATH_MAX;
 322         char *filename = malloc(size),
 323              *linkname = malloc(size);
 324         int err = -1;
 325
 326         if (filename == NULL || linkname == NULL)
 327                 goto out_free;
 328
 329         snprintf(linkname, size, "%s/.build-id/%.2s/%s",
 330                  debugdir, sbuild_id, sbuild_id + 2);
 331
 332         if (access(linkname, F_OK))
 333                 goto out_free;
 334
 335         if (readlink(linkname, filename, size) < 0)
 336                 goto out_free;
 337
 338         if (unlink(linkname))
 339                 goto out_free;
 340
 341         /*
 342          * Since the link is relative, we must make it absolute:
 343          */
 344         snprintf(linkname, size, "%s/.build-id/%.2s/%s",
 345                  debugdir, sbuild_id, filename);
 346
 347         if (unlink(linkname))
 348                 goto out_free;
 349
 350         err = 0;
 351 out_free:
 352         free(filename);
 353         free(linkname);
 354         return err;
 355 }
 356
 357 static int dso__cache_build_id(struct dso *self, const char *debugdir)
 358 {
 359         bool is_kallsyms = self->kernel && self->long_name[0] != '/';
 360
 361         return build_id_cache__add_b(self->build_id, sizeof(self->build_id),
 362                                      self->long_name, debugdir, is_kallsyms);
 363 }
 364
 365 static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
 366 {
 367         struct dso *pos;
 368         int err = 0;
 369
 370         dsos__for_each_with_build_id(pos, head)
 371                 if (dso__cache_build_id(pos, debugdir))
 372                         err = -1;
 373
 374         return err;
 375 }
 376
 377 static int machine__cache_build_ids(struct machine *self, const char *debugdir)
 378 {
 379         int ret = __dsos__cache_build_ids(&self->kernel_dsos, debugdir);
 380         ret |= __dsos__cache_build_ids(&self->user_dsos, debugdir);
 381         return ret;
 382 }
 383
 384 static int perf_session__cache_build_ids(struct perf_session *self)
 385 {
 386         struct rb_node *nd;
 387         int ret;
 388         char debugdir[PATH_MAX];
 389
 390         snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
 391
 392         if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
 393                 return -1;
 394
 395         ret = machine__cache_build_ids(&self->host_machine, debugdir);
 396
 397         for (nd = rb_first(&self->machines); nd; nd = rb_next(nd)) {
 398                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 399                 ret |= machine__cache_build_ids(pos, debugdir);
 400         }
 401         return ret ? -1 : 0;
 402 }
 403
 404 static bool machine__read_build_ids(struct machine *self, bool with_hits)
 405 {
 406         bool ret = __dsos__read_build_ids(&self->kernel_dsos, with_hits);
 407         ret |= __dsos__read_build_ids(&self->user_dsos, with_hits);
 408         return ret;
 409 }
 410
 411 static bool perf_session__read_build_ids(struct perf_session *self, bool with_hits)
 412 {
 413         struct rb_node *nd;
 414         bool ret = machine__read_build_ids(&self->host_machine, with_hits);
 415
 416         for (nd = rb_first(&self->machines); nd; nd = rb_next(nd)) {
 417                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 418                 ret |= machine__read_build_ids(pos, with_hits);
 419         }
 420
 421         return ret;
 422 }
 423
 424 static int perf_header__adds_write(struct perf_header *self, int fd)
 425 {
 426         int nr_sections;
 427         struct perf_session *session;
 428         struct perf_file_section *feat_sec;
 429         int sec_size;
 430         u64 sec_start;
 431         int idx = 0, err;
 432
 433         session = container_of(self, struct perf_session, header);
 434         if (perf_session__read_build_ids(session, true))
 435                 perf_header__set_feat(self, HEADER_BUILD_ID);
 436
 437         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 438         if (!nr_sections)
 439                 return 0;
 440
 441         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 442         if (feat_sec == NULL)
 443                 return -ENOMEM;
 444
 445         sec_size = sizeof(*feat_sec) * nr_sections;
 446
 447         sec_start = self->data_offset + self->data_size;
 448         lseek(fd, sec_start + sec_size, SEEK_SET);
 449
 450         if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
 451                 struct perf_file_section *trace_sec;
 452
 453                 trace_sec = &feat_sec[idx++];
 454
 455                 /* Write trace info */
 456                 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
 457                 read_tracing_data(fd, attrs, nr_counters);
 458                 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
 459         }
 460
 461         if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
 462                 struct perf_file_section *buildid_sec;
 463
 464                 buildid_sec = &feat_sec[idx++];
 465
 466                 /* Write build-ids */
 467                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
 468                 err = dsos__write_buildid_table(self, fd);
 469                 if (err < 0) {
 470                         pr_debug("failed to write buildid table\n");
 471                         goto out_free;
 472                 }
 473                 buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
 474                                           buildid_sec->offset;
 475                 if (!no_buildid_cache)
 476                         perf_session__cache_build_ids(session);
 477         }
 478
 479         lseek(fd, sec_start, SEEK_SET);
 480         err = do_write(fd, feat_sec, sec_size);
 481         if (err < 0)
 482                 pr_debug("failed to write feature section\n");
 483 out_free:
 484         free(feat_sec);
 485         return err;
 486 }
 487
 488 int perf_header__write_pipe(int fd)
 489 {
 490         struct perf_pipe_file_header f_header;
 491         int err;
 492
 493         f_header = (struct perf_pipe_file_header){
 494                 .magic     = PERF_MAGIC,
 495                 .size      = sizeof(f_header),
 496         };
 497
 498         err = do_write(fd, &f_header, sizeof(f_header));
 499         if (err < 0) {
 500                 pr_debug("failed to write perf pipe header\n");
 501                 return err;
 502         }
 503
 504         return 0;
 505 }
 506
 507 int perf_header__write(struct perf_header *self, int fd, bool at_exit)
 508 {
 509         struct perf_file_header f_header;
 510         struct perf_file_attr   f_attr;
 511         struct perf_header_attr *attr;
 512         int i, err;
 513
 514         lseek(fd, sizeof(f_header), SEEK_SET);
 515
 516         for (i = 0; i < self->attrs; i++) {
 517                 attr = self->attr[i];
 518
 519                 attr->id_offset = lseek(fd, 0, SEEK_CUR);
 520                 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
 521                 if (err < 0) {
 522                         pr_debug("failed to write perf header\n");
 523                         return err;
 524                 }
 525         }
 526
 527
 528         self->attr_offset = lseek(fd, 0, SEEK_CUR);
 529
 530         for (i = 0; i < self->attrs; i++) {
 531                 attr = self->attr[i];
 532
 533                 f_attr = (struct perf_file_attr){
 534                         .attr = attr->attr,
 535                         .ids  = {
 536                                 .offset = attr->id_offset,
 537                                 .size   = attr->ids * sizeof(u64),
 538                         }
 539                 };
 540                 err = do_write(fd, &f_attr, sizeof(f_attr));
 541                 if (err < 0) {
 542                         pr_debug("failed to write perf header attribute\n");
 543                         return err;
 544                 }
 545         }
 546
 547         self->event_offset = lseek(fd, 0, SEEK_CUR);
 548         self->event_size = event_count * sizeof(struct perf_trace_event_type);
 549         if (events) {
 550                 err = do_write(fd, events, self->event_size);
 551                 if (err < 0) {
 552                         pr_debug("failed to write perf header events\n");
 553                         return err;
 554                 }
 555         }
 556
 557         self->data_offset = lseek(fd, 0, SEEK_CUR);
 558
 559         if (at_exit) {
 560                 err = perf_header__adds_write(self, fd);
 561                 if (err < 0)
 562                         return err;
 563         }
 564
 565         f_header = (struct perf_file_header){
 566                 .magic     = PERF_MAGIC,
 567                 .size      = sizeof(f_header),
 568                 .attr_size = sizeof(f_attr),
 569                 .attrs = {
 570                         .offset = self->attr_offset,
 571                         .size   = self->attrs * sizeof(f_attr),
 572                 },
 573                 .data = {
 574                         .offset = self->data_offset,
 575                         .size   = self->data_size,
 576                 },
 577                 .event_types = {
 578                         .offset = self->event_offset,
 579                         .size   = self->event_size,
 580                 },
 581         };
 582
 583         memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 584
 585         lseek(fd, 0, SEEK_SET);
 586         err = do_write(fd, &f_header, sizeof(f_header));
 587         if (err < 0) {
 588                 pr_debug("failed to write perf header\n");
 589                 return err;
 590         }
 591         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 592
 593         self->frozen = 1;
 594         return 0;
 595 }
 596
 597 static int perf_header__getbuffer64(struct perf_header *self,
 598                                     int fd, void *buf, size_t size)
 599 {
 600         if (do_read(fd, buf, size) <= 0)
 601                 return -1;
 602
 603         if (self->needs_swap)
 604                 mem_bswap_64(buf, size);
 605
 606         return 0;
 607 }
 608
 609 int perf_header__process_sections(struct perf_header *self, int fd,
 610                                   int (*process)(struct perf_file_section *self,
 611                                                  struct perf_header *ph,
 612                                                  int feat, int fd))
 613 {
 614         struct perf_file_section *feat_sec;
 615         int nr_sections;
 616         int sec_size;
 617         int idx = 0;
 618         int err = -1, feat = 1;
 619
 620         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 621         if (!nr_sections)
 622                 return 0;
 623
 624         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 625         if (!feat_sec)
 626                 return -1;
 627
 628         sec_size = sizeof(*feat_sec) * nr_sections;
 629
 630         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 631
 632         if (perf_header__getbuffer64(self, fd, feat_sec, sec_size))
 633                 goto out_free;
 634
 635         err = 0;
 636         while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
 637                 if (perf_header__has_feat(self, feat)) {
 638                         struct perf_file_section *sec = &feat_sec[idx++];
 639
 640                         err = process(sec, self, feat, fd);
 641                         if (err < 0)
 642                                 break;
 643                 }
 644                 ++feat;
 645         }
 646 out_free:
 647         free(feat_sec);
 648         return err;
 649 }
 650
 651 int perf_file_header__read(struct perf_file_header *self,
 652                            struct perf_header *ph, int fd)
 653 {
 654         lseek(fd, 0, SEEK_SET);
 655
 656         if (do_read(fd, self, sizeof(*self)) <= 0 ||
 657             memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
 658                 return -1;
 659
 660         if (self->attr_size != sizeof(struct perf_file_attr)) {
 661                 u64 attr_size = bswap_64(self->attr_size);
 662
 663                 if (attr_size != sizeof(struct perf_file_attr))
 664                         return -1;
 665
 666                 mem_bswap_64(self, offsetof(struct perf_file_header,
 667                                             adds_features));
 668                 ph->needs_swap = true;
 669         }
 670
 671         if (self->size != sizeof(*self)) {
 672                 /* Support the previous format */
 673                 if (self->size == offsetof(typeof(*self), adds_features))
 674                         bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
 675                 else
 676                         return -1;
 677         }
 678
 679         memcpy(&ph->adds_features, &self->adds_features,
 680                sizeof(ph->adds_features));
 681         /*
 682          * FIXME: hack that assumes that if we need swap the perf.data file
 683          * may be coming from an arch with a different word-size, ergo different
 684          * DEFINE_BITMAP format, investigate more later, but for now its mostly
 685          * safe to assume that we have a build-id section. Trace files probably
 686          * have several other issues in this realm anyway...
 687          */
 688         if (ph->needs_swap) {
 689                 memset(&ph->adds_features, 0, sizeof(ph->adds_features));
 690                 perf_header__set_feat(ph, HEADER_BUILD_ID);
 691         }
 692
 693         ph->event_offset = self->event_types.offset;
 694         ph->event_size   = self->event_types.size;
 695         ph->data_offset  = self->data.offset;
 696         ph->data_size    = self->data.size;
 697         return 0;
 698 }
 699
 700 static int __event_process_build_id(struct build_id_event *bev,
 701                                     char *filename,
 702                                     struct perf_session *session)
 703 {
 704         int err = -1;
 705         struct list_head *head;
 706         struct machine *machine;
 707         u16 misc;
 708         struct dso *dso;
 709         enum dso_kernel_type dso_type;
 710
 711         machine = perf_session__findnew_machine(session, bev->pid);
 712         if (!machine)
 713                 goto out;
 714
 715         misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 716
 717         switch (misc) {
 718         case PERF_RECORD_MISC_KERNEL:
 719                 dso_type = DSO_TYPE_KERNEL;
 720                 head = &machine->kernel_dsos;
 721                 break;
 722         case PERF_RECORD_MISC_GUEST_KERNEL:
 723                 dso_type = DSO_TYPE_GUEST_KERNEL;
 724                 head = &machine->kernel_dsos;
 725                 break;
 726         case PERF_RECORD_MISC_USER:
 727         case PERF_RECORD_MISC_GUEST_USER:
 728                 dso_type = DSO_TYPE_USER;
 729                 head = &machine->user_dsos;
 730                 break;
 731         default:
 732                 goto out;
 733         }
 734
 735         dso = __dsos__findnew(head, filename);
 736         if (dso != NULL) {
 737                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 738
 739                 dso__set_build_id(dso, &bev->build_id);
 740
 741                 if (filename[0] == '[')
 742                         dso->kernel = dso_type;
 743
 744                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
 745                                   sbuild_id);
 746                 pr_debug("build id event received for %s: %s\n",
 747                          dso->long_name, sbuild_id);
 748         }
 749
 750         err = 0;
 751 out:
 752         return err;
 753 }
 754
 755 static int perf_header__read_build_ids(struct perf_header *self,
 756                         int input, u64 offset, u64 size)
 757 {
 758         struct perf_session *session = container_of(self,
 759                         struct perf_session, header);
 760         struct build_id_event bev;
 761         char filename[PATH_MAX];
 762         u64 limit = offset + size;
 763         int err = -1;
 764
 765         while (offset < limit) {
 766                 ssize_t len;
 767
 768                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
 769                         goto out;
 770
 771                 if (self->needs_swap)
 772                         perf_event_header__bswap(&bev.header);
 773
 774                 len = bev.header.size - sizeof(bev);
 775                 if (read(input, filename, len) != len)
 776                         goto out;
 777
 778                 __event_process_build_id(&bev, filename, session);
 779
 780                 offset += bev.header.size;
 781         }
 782         err = 0;
 783 out:
 784         return err;
 785 }
 786
 787 static int perf_file_section__process(struct perf_file_section *self,
 788                                       struct perf_header *ph,
 789                                       int feat, int fd)
 790 {
 791         if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {
 792                 pr_debug("Failed to lseek to %Ld offset for feature %d, "
 793                          "continuing...\n", self->offset, feat);
 794                 return 0;
 795         }
 796
 797         switch (feat) {
 798         case HEADER_TRACE_INFO:
 799                 trace_report(fd, false);
 800                 break;
 801
 802         case HEADER_BUILD_ID:
 803                 if (perf_header__read_build_ids(ph, fd, self->offset, self->size))
 804                         pr_debug("Failed to read buildids, continuing...\n");
 805                 break;
 806         default:
 807                 pr_debug("unknown feature %d, continuing...\n", feat);
 808         }
 809
 810         return 0;
 811 }
 812
 813 static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
 814                                        struct perf_header *ph, int fd,
 815                                        bool repipe)
 816 {
 817         if (do_read(fd, self, sizeof(*self)) <= 0 ||
 818             memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
 819                 return -1;
 820
 821         if (repipe && do_write(STDOUT_FILENO, self, sizeof(*self)) < 0)
 822                 return -1;
 823
 824         if (self->size != sizeof(*self)) {
 825                 u64 size = bswap_64(self->size);
 826
 827                 if (size != sizeof(*self))
 828                         return -1;
 829
 830                 ph->needs_swap = true;
 831         }
 832
 833         return 0;
 834 }
 835
 836 static int perf_header__read_pipe(struct perf_session *session, int fd)
 837 {
 838         struct perf_header *self = &session->header;
 839         struct perf_pipe_file_header f_header;
 840
 841         if (perf_file_header__read_pipe(&f_header, self, fd,
 842                                         session->repipe) < 0) {
 843                 pr_debug("incompatible file format\n");
 844                 return -EINVAL;
 845         }
 846
 847         session->fd = fd;
 848
 849         return 0;
 850 }
 851
 852 int perf_header__read(struct perf_session *session, int fd)
 853 {
 854         struct perf_header *self = &session->header;
 855         struct perf_file_header f_header;
 856         struct perf_file_attr   f_attr;
 857         u64                     f_id;
 858         int nr_attrs, nr_ids, i, j;
 859
 860         if (session->fd_pipe)
 861                 return perf_header__read_pipe(session, fd);
 862
 863         if (perf_file_header__read(&f_header, self, fd) < 0) {
 864                 pr_debug("incompatible file format\n");
 865                 return -EINVAL;
 866         }
 867
 868         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 869         lseek(fd, f_header.attrs.offset, SEEK_SET);
 870
 871         for (i = 0; i < nr_attrs; i++) {
 872                 struct perf_header_attr *attr;
 873                 off_t tmp;
 874
 875                 if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr)))
 876                         goto out_errno;
 877
 878                 tmp = lseek(fd, 0, SEEK_CUR);
 879
 880                 attr = perf_header_attr__new(&f_attr.attr);
 881                 if (attr == NULL)
 882                          return -ENOMEM;
 883
 884                 nr_ids = f_attr.ids.size / sizeof(u64);
 885                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 886
 887                 for (j = 0; j < nr_ids; j++) {
 888                         if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id)))
 889                                 goto out_errno;
 890
 891                         if (perf_header_attr__add_id(attr, f_id) < 0) {
 892                                 perf_header_attr__delete(attr);
 893                                 return -ENOMEM;
 894                         }
 895                 }
 896                 if (perf_header__add_attr(self, attr) < 0) {
 897                         perf_header_attr__delete(attr);
 898                         return -ENOMEM;
 899                 }
 900
 901                 lseek(fd, tmp, SEEK_SET);
 902         }
 903
 904         if (f_header.event_types.size) {
 905                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 906                 events = malloc(f_header.event_types.size);
 907                 if (events == NULL)
 908                         return -ENOMEM;
 909                 if (perf_header__getbuffer64(self, fd, events,
 910                                              f_header.event_types.size))
 911                         goto out_errno;
 912                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 913         }
 914
 915         perf_header__process_sections(self, fd, perf_file_section__process);
 916
 917         lseek(fd, self->data_offset, SEEK_SET);
 918
 919         self->frozen = 1;
 920         return 0;
 921 out_errno:
 922         return -errno;
 923 }
 924
 925 u64 perf_header__sample_type(struct perf_header *header)
 926 {
 927         u64 type = 0;
 928         int i;
 929
 930         for (i = 0; i < header->attrs; i++) {
 931                 struct perf_header_attr *attr = header->attr[i];
 932
 933                 if (!type)
 934                         type = attr->attr.sample_type;
 935                 else if (type != attr->attr.sample_type)
 936                         die("non matching sample_type");
 937         }
 938
 939         return type;
 940 }
 941
 942 struct perf_event_attr *
 943 perf_header__find_attr(u64 id, struct perf_header *header)
 944 {
 945         int i;
 946
 947         /*
 948          * We set id to -1 if the data file doesn't contain sample
 949          * ids. Check for this and avoid walking through the entire
 950          * list of ids which may be large.
 951          */
 952         if (id == -1ULL)
 953                 return NULL;
 954
 955         for (i = 0; i < header->attrs; i++) {
 956                 struct perf_header_attr *attr = header->attr[i];
 957                 int j;
 958
 959                 for (j = 0; j < attr->ids; j++) {
 960                         if (attr->id[j] == id)
 961                                 return &attr->attr;
 962                 }
 963         }
 964
 965         return NULL;
 966 }
 967
 968 int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
 969                            event__handler_t process,
 970                            struct perf_session *session)
 971 {
 972         event_t *ev;
 973         size_t size;
 974         int err;
 975
 976         size = sizeof(struct perf_event_attr);
 977         size = ALIGN(size, sizeof(u64));
 978         size += sizeof(struct perf_event_header);
 979         size += ids * sizeof(u64);
 980
 981         ev = malloc(size);
 982
 983         ev->attr.attr = *attr;
 984         memcpy(ev->attr.id, id, ids * sizeof(u64));
 985
 986         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
 987         ev->attr.header.size = size;
 988
 989         err = process(ev, session);
 990
 991         free(ev);
 992
 993         return err;
 994 }
 995
 996 int event__synthesize_attrs(struct perf_header *self,
 997                             event__handler_t process,
 998                             struct perf_session *session)
 999 {
1000         struct perf_header_attr *attr;
1001         int i, err = 0;
1002
1003         for (i = 0; i < self->attrs; i++) {
1004                 attr = self->attr[i];
1005
1006                 err = event__synthesize_attr(&attr->attr, attr->ids, attr->id,
1007                                              process, session);
1008                 if (err) {
1009                         pr_debug("failed to create perf header attribute\n");
1010                         return err;
1011                 }
1012         }
1013
1014         return err;
1015 }
1016
1017 int event__process_attr(event_t *self, struct perf_session *session)
1018 {
1019         struct perf_header_attr *attr;
1020         unsigned int i, ids, n_ids;
1021
1022         attr = perf_header_attr__new(&self->attr.attr);
1023         if (attr == NULL)
1024                 return -ENOMEM;
1025
1026         ids = self->header.size;
1027         ids -= (void *)&self->attr.id - (void *)self;
1028         n_ids = ids / sizeof(u64);
1029
1030         for (i = 0; i < n_ids; i++) {
1031                 if (perf_header_attr__add_id(attr, self->attr.id[i]) < 0) {
1032                         perf_header_attr__delete(attr);
1033                         return -ENOMEM;
1034                 }
1035         }
1036
1037         if (perf_header__add_attr(&session->header, attr) < 0) {
1038                 perf_header_attr__delete(attr);
1039                 return -ENOMEM;
1040         }
1041
1042         perf_session__update_sample_type(session);
1043
1044         return 0;
1045 }
1046
1047 int event__synthesize_event_type(u64 event_id, char *name,
1048                                  event__handler_t process,
1049                                  struct perf_session *session)
1050 {
1051         event_t ev;
1052         size_t size = 0;
1053         int err = 0;
1054
1055         memset(&ev, 0, sizeof(ev));
1056
1057         ev.event_type.event_type.event_id = event_id;
1058         memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
1059         strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
1060
1061         ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
1062         size = strlen(name);
1063         size = ALIGN(size, sizeof(u64));
1064         ev.event_type.header.size = sizeof(ev.event_type) -
1065                 (sizeof(ev.event_type.event_type.name) - size);
1066
1067         err = process(&ev, session);
1068
1069         return err;
1070 }
1071
1072 int event__synthesize_event_types(event__handler_t process,
1073                                   struct perf_session *session)
1074 {
1075         struct perf_trace_event_type *type;
1076         int i, err = 0;
1077
1078         for (i = 0; i < event_count; i++) {
1079                 type = &events[i];
1080
1081                 err = event__synthesize_event_type(type->event_id, type->name,
1082                                                    process, session);
1083                 if (err) {
1084                         pr_debug("failed to create perf header event type\n");
1085                         return err;
1086                 }
1087         }
1088
1089         return err;
1090 }
1091
1092 int event__process_event_type(event_t *self,
1093                               struct perf_session *session __unused)
1094 {
1095         if (perf_header__push_event(self->event_type.event_type.event_id,
1096                                     self->event_type.event_type.name) < 0)
1097                 return -ENOMEM;
1098
1099         return 0;
1100 }
1101
1102 int event__synthesize_tracing_data(int fd, struct perf_event_attr *pattrs,
1103                                    int nb_events,
1104                                    event__handler_t process,
1105                                    struct perf_session *session __unused)
1106 {
1107         event_t ev;
1108         ssize_t size = 0, aligned_size = 0, padding;
1109         int err = 0;
1110
1111         memset(&ev, 0, sizeof(ev));
1112
1113         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1114         size = read_tracing_data_size(fd, pattrs, nb_events);
1115         if (size <= 0)
1116                 return size;
1117         aligned_size = ALIGN(size, sizeof(u64));
1118         padding = aligned_size - size;
1119         ev.tracing_data.header.size = sizeof(ev.tracing_data);
1120         ev.tracing_data.size = aligned_size;
1121
1122         process(&ev, session);
1123
1124         err = read_tracing_data(fd, pattrs, nb_events);
1125         write_padded(fd, NULL, 0, padding);
1126
1127         return aligned_size;
1128 }
1129
1130 int event__process_tracing_data(event_t *self,
1131                                 struct perf_session *session)
1132 {
1133         ssize_t size_read, padding, size = self->tracing_data.size;
1134         off_t offset = lseek(session->fd, 0, SEEK_CUR);
1135         char buf[BUFSIZ];
1136
1137         /* setup for reading amidst mmap */
1138         lseek(session->fd, offset + sizeof(struct tracing_data_event),
1139               SEEK_SET);
1140
1141         size_read = trace_report(session->fd, session->repipe);
1142
1143         padding = ALIGN(size_read, sizeof(u64)) - size_read;
1144
1145         if (read(session->fd, buf, padding) < 0)
1146                 die("reading input file");
1147         if (session->repipe) {
1148                 int retw = write(STDOUT_FILENO, buf, padding);
1149                 if (retw <= 0 || retw != padding)
1150                         die("repiping tracing data padding");
1151         }
1152
1153         if (size_read + padding != size)
1154                 die("tracing data size mismatch");
1155
1156         return size_read + padding;
1157 }
1158
1159 int event__synthesize_build_id(struct dso *pos, u16 misc,
1160                                event__handler_t process,
1161                                struct machine *machine,
1162                                struct perf_session *session)
1163 {
1164         event_t ev;
1165         size_t len;
1166         int err = 0;
1167
1168         if (!pos->hit)
1169                 return err;
1170
1171         memset(&ev, 0, sizeof(ev));
1172
1173         len = pos->long_name_len + 1;
1174         len = ALIGN(len, NAME_ALIGN);
1175         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1176         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1177         ev.build_id.header.misc = misc;
1178         ev.build_id.pid = machine->pid;
1179         ev.build_id.header.size = sizeof(ev.build_id) + len;
1180         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1181
1182         err = process(&ev, session);
1183
1184         return err;
1185 }
1186
1187 int event__process_build_id(event_t *self,
1188                             struct perf_session *session)
1189 {
1190         __event_process_build_id(&self->build_id,
1191                                  self->build_id.filename,
1192                                  session);
1193         return 0;
1194 }
1195
1196 void disable_buildid_cache(void)
1197 {
1198         no_buildid_cache = true;
1199 }