release/src-rt-6.x.4708/linux/linux-2.6.36/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         if (ph->needs_swap) {
 682                 memset(&ph->adds_features, 0, sizeof(ph->adds_features));
 683                 perf_header__set_feat(ph, HEADER_BUILD_ID);
 684         }
 685
 686         ph->event_offset = self->event_types.offset;
 687         ph->event_size   = self->event_types.size;
 688         ph->data_offset  = self->data.offset;
 689         ph->data_size    = self->data.size;
 690         return 0;
 691 }
 692
 693 static int __event_process_build_id(struct build_id_event *bev,
 694                                     char *filename,
 695                                     struct perf_session *session)
 696 {
 697         int err = -1;
 698         struct list_head *head;
 699         struct machine *machine;
 700         u16 misc;
 701         struct dso *dso;
 702         enum dso_kernel_type dso_type;
 703
 704         machine = perf_session__findnew_machine(session, bev->pid);
 705         if (!machine)
 706                 goto out;
 707
 708         misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 709
 710         switch (misc) {
 711         case PERF_RECORD_MISC_KERNEL:
 712                 dso_type = DSO_TYPE_KERNEL;
 713                 head = &machine->kernel_dsos;
 714                 break;
 715         case PERF_RECORD_MISC_GUEST_KERNEL:
 716                 dso_type = DSO_TYPE_GUEST_KERNEL;
 717                 head = &machine->kernel_dsos;
 718                 break;
 719         case PERF_RECORD_MISC_USER:
 720         case PERF_RECORD_MISC_GUEST_USER:
 721                 dso_type = DSO_TYPE_USER;
 722                 head = &machine->user_dsos;
 723                 break;
 724         default:
 725                 goto out;
 726         }
 727
 728         dso = __dsos__findnew(head, filename);
 729         if (dso != NULL) {
 730                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 731
 732                 dso__set_build_id(dso, &bev->build_id);
 733
 734                 if (filename[0] == '[')
 735                         dso->kernel = dso_type;
 736
 737                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
 738                                   sbuild_id);
 739                 pr_debug("build id event received for %s: %s\n",
 740                          dso->long_name, sbuild_id);
 741         }
 742
 743         err = 0;
 744 out:
 745         return err;
 746 }
 747
 748 static int perf_header__read_build_ids(struct perf_header *self,
 749                         int input, u64 offset, u64 size)
 750 {
 751         struct perf_session *session = container_of(self,
 752                         struct perf_session, header);
 753         struct build_id_event bev;
 754         char filename[PATH_MAX];
 755         u64 limit = offset + size;
 756         int err = -1;
 757
 758         while (offset < limit) {
 759                 ssize_t len;
 760
 761                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
 762                         goto out;
 763
 764                 if (self->needs_swap)
 765                         perf_event_header__bswap(&bev.header);
 766
 767                 len = bev.header.size - sizeof(bev);
 768                 if (read(input, filename, len) != len)
 769                         goto out;
 770
 771                 __event_process_build_id(&bev, filename, session);
 772
 773                 offset += bev.header.size;
 774         }
 775         err = 0;
 776 out:
 777         return err;
 778 }
 779
 780 static int perf_file_section__process(struct perf_file_section *self,
 781                                       struct perf_header *ph,
 782                                       int feat, int fd)
 783 {
 784         if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {
 785                 pr_debug("Failed to lseek to %Ld offset for feature %d, "
 786                          "continuing...\n", self->offset, feat);
 787                 return 0;
 788         }
 789
 790         switch (feat) {
 791         case HEADER_TRACE_INFO:
 792                 trace_report(fd, false);
 793                 break;
 794
 795         case HEADER_BUILD_ID:
 796                 if (perf_header__read_build_ids(ph, fd, self->offset, self->size))
 797                         pr_debug("Failed to read buildids, continuing...\n");
 798                 break;
 799         default:
 800                 pr_debug("unknown feature %d, continuing...\n", feat);
 801         }
 802
 803         return 0;
 804 }
 805
 806 static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
 807                                        struct perf_header *ph, int fd,
 808                                        bool repipe)
 809 {
 810         if (do_read(fd, self, sizeof(*self)) <= 0 ||
 811             memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
 812                 return -1;
 813
 814         if (repipe && do_write(STDOUT_FILENO, self, sizeof(*self)) < 0)
 815                 return -1;
 816
 817         if (self->size != sizeof(*self)) {
 818                 u64 size = bswap_64(self->size);
 819
 820                 if (size != sizeof(*self))
 821                         return -1;
 822
 823                 ph->needs_swap = true;
 824         }
 825
 826         return 0;
 827 }
 828
 829 static int perf_header__read_pipe(struct perf_session *session, int fd)
 830 {
 831         struct perf_header *self = &session->header;
 832         struct perf_pipe_file_header f_header;
 833
 834         if (perf_file_header__read_pipe(&f_header, self, fd,
 835                                         session->repipe) < 0) {
 836                 pr_debug("incompatible file format\n");
 837                 return -EINVAL;
 838         }
 839
 840         session->fd = fd;
 841
 842         return 0;
 843 }
 844
 845 int perf_header__read(struct perf_session *session, int fd)
 846 {
 847         struct perf_header *self = &session->header;
 848         struct perf_file_header f_header;
 849         struct perf_file_attr   f_attr;
 850         u64                     f_id;
 851         int nr_attrs, nr_ids, i, j;
 852
 853         if (session->fd_pipe)
 854                 return perf_header__read_pipe(session, fd);
 855
 856         if (perf_file_header__read(&f_header, self, fd) < 0) {
 857                 pr_debug("incompatible file format\n");
 858                 return -EINVAL;
 859         }
 860
 861         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 862         lseek(fd, f_header.attrs.offset, SEEK_SET);
 863
 864         for (i = 0; i < nr_attrs; i++) {
 865                 struct perf_header_attr *attr;
 866                 off_t tmp;
 867
 868                 if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr)))
 869                         goto out_errno;
 870
 871                 tmp = lseek(fd, 0, SEEK_CUR);
 872
 873                 attr = perf_header_attr__new(&f_attr.attr);
 874                 if (attr == NULL)
 875                          return -ENOMEM;
 876
 877                 nr_ids = f_attr.ids.size / sizeof(u64);
 878                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 879
 880                 for (j = 0; j < nr_ids; j++) {
 881                         if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id)))
 882                                 goto out_errno;
 883
 884                         if (perf_header_attr__add_id(attr, f_id) < 0) {
 885                                 perf_header_attr__delete(attr);
 886                                 return -ENOMEM;
 887                         }
 888                 }
 889                 if (perf_header__add_attr(self, attr) < 0) {
 890                         perf_header_attr__delete(attr);
 891                         return -ENOMEM;
 892                 }
 893
 894                 lseek(fd, tmp, SEEK_SET);
 895         }
 896
 897         if (f_header.event_types.size) {
 898                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 899                 events = malloc(f_header.event_types.size);
 900                 if (events == NULL)
 901                         return -ENOMEM;
 902                 if (perf_header__getbuffer64(self, fd, events,
 903                                              f_header.event_types.size))
 904                         goto out_errno;
 905                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 906         }
 907
 908         perf_header__process_sections(self, fd, perf_file_section__process);
 909
 910         lseek(fd, self->data_offset, SEEK_SET);
 911
 912         self->frozen = 1;
 913         return 0;
 914 out_errno:
 915         return -errno;
 916 }
 917
 918 u64 perf_header__sample_type(struct perf_header *header)
 919 {
 920         u64 type = 0;
 921         int i;
 922
 923         for (i = 0; i < header->attrs; i++) {
 924                 struct perf_header_attr *attr = header->attr[i];
 925
 926                 if (!type)
 927                         type = attr->attr.sample_type;
 928                 else if (type != attr->attr.sample_type)
 929                         die("non matching sample_type");
 930         }
 931
 932         return type;
 933 }
 934
 935 struct perf_event_attr *
 936 perf_header__find_attr(u64 id, struct perf_header *header)
 937 {
 938         int i;
 939
 940         /*
 941          * We set id to -1 if the data file doesn't contain sample
 942          * ids. Check for this and avoid walking through the entire
 943          * list of ids which may be large.
 944          */
 945         if (id == -1ULL)
 946                 return NULL;
 947
 948         for (i = 0; i < header->attrs; i++) {
 949                 struct perf_header_attr *attr = header->attr[i];
 950                 int j;
 951
 952                 for (j = 0; j < attr->ids; j++) {
 953                         if (attr->id[j] == id)
 954                                 return &attr->attr;
 955                 }
 956         }
 957
 958         return NULL;
 959 }
 960
 961 int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
 962                            event__handler_t process,
 963                            struct perf_session *session)
 964 {
 965         event_t *ev;
 966         size_t size;
 967         int err;
 968
 969         size = sizeof(struct perf_event_attr);
 970         size = ALIGN(size, sizeof(u64));
 971         size += sizeof(struct perf_event_header);
 972         size += ids * sizeof(u64);
 973
 974         ev = malloc(size);
 975
 976         ev->attr.attr = *attr;
 977         memcpy(ev->attr.id, id, ids * sizeof(u64));
 978
 979         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
 980         ev->attr.header.size = size;
 981
 982         err = process(ev, session);
 983
 984         free(ev);
 985
 986         return err;
 987 }
 988
 989 int event__synthesize_attrs(struct perf_header *self,
 990                             event__handler_t process,
 991                             struct perf_session *session)
 992 {
 993         struct perf_header_attr *attr;
 994         int i, err = 0;
 995
 996         for (i = 0; i < self->attrs; i++) {
 997                 attr = self->attr[i];
 998
 999                 err = event__synthesize_attr(&attr->attr, attr->ids, attr->id,
1000                                              process, session);
1001                 if (err) {
1002                         pr_debug("failed to create perf header attribute\n");
1003                         return err;
1004                 }
1005         }
1006
1007         return err;
1008 }
1009
1010 int event__process_attr(event_t *self, struct perf_session *session)
1011 {
1012         struct perf_header_attr *attr;
1013         unsigned int i, ids, n_ids;
1014
1015         attr = perf_header_attr__new(&self->attr.attr);
1016         if (attr == NULL)
1017                 return -ENOMEM;
1018
1019         ids = self->header.size;
1020         ids -= (void *)&self->attr.id - (void *)self;
1021         n_ids = ids / sizeof(u64);
1022
1023         for (i = 0; i < n_ids; i++) {
1024                 if (perf_header_attr__add_id(attr, self->attr.id[i]) < 0) {
1025                         perf_header_attr__delete(attr);
1026                         return -ENOMEM;
1027                 }
1028         }
1029
1030         if (perf_header__add_attr(&session->header, attr) < 0) {
1031                 perf_header_attr__delete(attr);
1032                 return -ENOMEM;
1033         }
1034
1035         perf_session__update_sample_type(session);
1036
1037         return 0;
1038 }
1039
1040 int event__synthesize_event_type(u64 event_id, char *name,
1041                                  event__handler_t process,
1042                                  struct perf_session *session)
1043 {
1044         event_t ev;
1045         size_t size = 0;
1046         int err = 0;
1047
1048         memset(&ev, 0, sizeof(ev));
1049
1050         ev.event_type.event_type.event_id = event_id;
1051         memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
1052         strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
1053
1054         ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
1055         size = strlen(name);
1056         size = ALIGN(size, sizeof(u64));
1057         ev.event_type.header.size = sizeof(ev.event_type) -
1058                 (sizeof(ev.event_type.event_type.name) - size);
1059
1060         err = process(&ev, session);
1061
1062         return err;
1063 }
1064
1065 int event__synthesize_event_types(event__handler_t process,
1066                                   struct perf_session *session)
1067 {
1068         struct perf_trace_event_type *type;
1069         int i, err = 0;
1070
1071         for (i = 0; i < event_count; i++) {
1072                 type = &events[i];
1073
1074                 err = event__synthesize_event_type(type->event_id, type->name,
1075                                                    process, session);
1076                 if (err) {
1077                         pr_debug("failed to create perf header event type\n");
1078                         return err;
1079                 }
1080         }
1081
1082         return err;
1083 }
1084
1085 int event__process_event_type(event_t *self,
1086                               struct perf_session *session __unused)
1087 {
1088         if (perf_header__push_event(self->event_type.event_type.event_id,
1089                                     self->event_type.event_type.name) < 0)
1090                 return -ENOMEM;
1091
1092         return 0;
1093 }
1094
1095 int event__synthesize_tracing_data(int fd, struct perf_event_attr *pattrs,
1096                                    int nb_events,
1097                                    event__handler_t process,
1098                                    struct perf_session *session __unused)
1099 {
1100         event_t ev;
1101         ssize_t size = 0, aligned_size = 0, padding;
1102         int err = 0;
1103
1104         memset(&ev, 0, sizeof(ev));
1105
1106         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1107         size = read_tracing_data_size(fd, pattrs, nb_events);
1108         if (size <= 0)
1109                 return size;
1110         aligned_size = ALIGN(size, sizeof(u64));
1111         padding = aligned_size - size;
1112         ev.tracing_data.header.size = sizeof(ev.tracing_data);
1113         ev.tracing_data.size = aligned_size;
1114
1115         process(&ev, session);
1116
1117         err = read_tracing_data(fd, pattrs, nb_events);
1118         write_padded(fd, NULL, 0, padding);
1119
1120         return aligned_size;
1121 }
1122
1123 int event__process_tracing_data(event_t *self,
1124                                 struct perf_session *session)
1125 {
1126         ssize_t size_read, padding, size = self->tracing_data.size;
1127         off_t offset = lseek(session->fd, 0, SEEK_CUR);
1128         char buf[BUFSIZ];
1129
1130         /* setup for reading amidst mmap */
1131         lseek(session->fd, offset + sizeof(struct tracing_data_event),
1132               SEEK_SET);
1133
1134         size_read = trace_report(session->fd, session->repipe);
1135
1136         padding = ALIGN(size_read, sizeof(u64)) - size_read;
1137
1138         if (read(session->fd, buf, padding) < 0)
1139                 die("reading input file");
1140         if (session->repipe) {
1141                 int retw = write(STDOUT_FILENO, buf, padding);
1142                 if (retw <= 0 || retw != padding)
1143                         die("repiping tracing data padding");
1144         }
1145
1146         if (size_read + padding != size)
1147                 die("tracing data size mismatch");
1148
1149         return size_read + padding;
1150 }
1151
1152 int event__synthesize_build_id(struct dso *pos, u16 misc,
1153                                event__handler_t process,
1154                                struct machine *machine,
1155                                struct perf_session *session)
1156 {
1157         event_t ev;
1158         size_t len;
1159         int err = 0;
1160
1161         if (!pos->hit)
1162                 return err;
1163
1164         memset(&ev, 0, sizeof(ev));
1165
1166         len = pos->long_name_len + 1;
1167         len = ALIGN(len, NAME_ALIGN);
1168         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1169         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1170         ev.build_id.header.misc = misc;
1171         ev.build_id.pid = machine->pid;
1172         ev.build_id.header.size = sizeof(ev.build_id) + len;
1173         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1174
1175         err = process(&ev, session);
1176
1177         return err;
1178 }
1179
1180 int event__process_build_id(event_t *self,
1181                             struct perf_session *session)
1182 {
1183         __event_process_build_id(&self->build_id,
1184                                  self->build_id.filename,
1185                                  session);
1186         return 0;
1187 }
1188
1189 void disable_buildid_cache(void)
1190 {
1191         no_buildid_cache = true;
1192 }