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