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         if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
 440                 struct perf_file_section *buildid_sec;
 441
 442                 buildid_sec = &feat_sec[idx++];
 443
 444                 /* Write build-ids */
 445                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
 446                 err = dsos__write_buildid_table(self, fd);
 447                 if (err < 0) {
 448                         pr_debug("failed to write buildid table\n");
 449                         goto out_free;
 450                 }
 451                 buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
 452                                           buildid_sec->offset;
 453                 dsos__cache_build_ids(self);
 454         }
 455
 456         lseek(fd, sec_start, SEEK_SET);
 457         err = do_write(fd, feat_sec, sec_size);
 458         if (err < 0)
 459                 pr_debug("failed to write feature section\n");
 460 out_free:
 461         free(feat_sec);
 462         return err;
 463 }
 464
 465 int perf_header__write_pipe(int fd)
 466 {
 467         struct perf_pipe_file_header f_header;
 468         int err;
 469
 470         f_header = (struct perf_pipe_file_header){
 471                 .magic     = PERF_MAGIC,
 472                 .size      = sizeof(f_header),
 473         };
 474
 475         err = do_write(fd, &f_header, sizeof(f_header));
 476         if (err < 0) {
 477                 pr_debug("failed to write perf pipe header\n");
 478                 return err;
 479         }
 480
 481         return 0;
 482 }
 483
 484 int perf_header__write(struct perf_header *self, int fd, bool at_exit)
 485 {
 486         struct perf_file_header f_header;
 487         struct perf_file_attr   f_attr;
 488         struct perf_header_attr *attr;
 489         int i, err;
 490
 491         lseek(fd, sizeof(f_header), SEEK_SET);
 492
 493
 494         for (i = 0; i < self->attrs; i++) {
 495                 attr = self->attr[i];
 496
 497                 attr->id_offset = lseek(fd, 0, SEEK_CUR);
 498                 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
 499                 if (err < 0) {
 500                         pr_debug("failed to write perf header\n");
 501                         return err;
 502                 }
 503         }
 504
 505
 506         self->attr_offset = lseek(fd, 0, SEEK_CUR);
 507
 508         for (i = 0; i < self->attrs; i++) {
 509                 attr = self->attr[i];
 510
 511                 f_attr = (struct perf_file_attr){
 512                         .attr = attr->attr,
 513                         .ids  = {
 514                                 .offset = attr->id_offset,
 515                                 .size   = attr->ids * sizeof(u64),
 516                         }
 517                 };
 518                 err = do_write(fd, &f_attr, sizeof(f_attr));
 519                 if (err < 0) {
 520                         pr_debug("failed to write perf header attribute\n");
 521                         return err;
 522                 }
 523         }
 524
 525         self->event_offset = lseek(fd, 0, SEEK_CUR);
 526         self->event_size = event_count * sizeof(struct perf_trace_event_type);
 527         if (events) {
 528                 err = do_write(fd, events, self->event_size);
 529                 if (err < 0) {
 530                         pr_debug("failed to write perf header events\n");
 531                         return err;
 532                 }
 533         }
 534
 535         self->data_offset = lseek(fd, 0, SEEK_CUR);
 536
 537         if (at_exit) {
 538                 err = perf_header__adds_write(self, fd);
 539                 if (err < 0)
 540                         return err;
 541         }
 542
 543         f_header = (struct perf_file_header){
 544                 .magic     = PERF_MAGIC,
 545                 .size      = sizeof(f_header),
 546                 .attr_size = sizeof(f_attr),
 547                 .attrs = {
 548                         .offset = self->attr_offset,
 549                         .size   = self->attrs * sizeof(f_attr),
 550                 },
 551                 .data = {
 552                         .offset = self->data_offset,
 553                         .size   = self->data_size,
 554                 },
 555                 .event_types = {
 556                         .offset = self->event_offset,
 557                         .size   = self->event_size,
 558                 },
 559         };
 560
 561         memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 562
 563         lseek(fd, 0, SEEK_SET);
 564         err = do_write(fd, &f_header, sizeof(f_header));
 565         if (err < 0) {
 566                 pr_debug("failed to write perf header\n");
 567                 return err;
 568         }
 569         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 570
 571         self->frozen = 1;
 572         return 0;
 573 }
 574
 575 static int perf_header__getbuffer64(struct perf_header *self,
 576                                     int fd, void *buf, size_t size)
 577 {
 578         if (do_read(fd, buf, size) <= 0)
 579                 return -1;
 580
 581         if (self->needs_swap)
 582                 mem_bswap_64(buf, size);
 583
 584         return 0;
 585 }
 586
 587 int perf_header__process_sections(struct perf_header *self, int fd,
 588                                   int (*process)(struct perf_file_section *self,
 589                                                  struct perf_header *ph,
 590                                                  int feat, int fd))
 591 {
 592         struct perf_file_section *feat_sec;
 593         int nr_sections;
 594         int sec_size;
 595         int idx = 0;
 596         int err = -1, feat = 1;
 597
 598         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 599         if (!nr_sections)
 600                 return 0;
 601
 602         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 603         if (!feat_sec)
 604                 return -1;
 605
 606         sec_size = sizeof(*feat_sec) * nr_sections;
 607
 608         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 609
 610         if (perf_header__getbuffer64(self, fd, feat_sec, sec_size))
 611                 goto out_free;
 612
 613         err = 0;
 614         while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
 615                 if (perf_header__has_feat(self, feat)) {
 616                         struct perf_file_section *sec = &feat_sec[idx++];
 617
 618                         err = process(sec, self, feat, fd);
 619                         if (err < 0)
 620                                 break;
 621                 }
 622                 ++feat;
 623         }
 624 out_free:
 625         free(feat_sec);
 626         return err;
 627 }
 628
 629 int perf_file_header__read(struct perf_file_header *self,
 630                            struct perf_header *ph, int fd)
 631 {
 632         lseek(fd, 0, SEEK_SET);
 633
 634         if (do_read(fd, self, sizeof(*self)) <= 0 ||
 635             memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
 636                 return -1;
 637
 638         if (self->attr_size != sizeof(struct perf_file_attr)) {
 639                 u64 attr_size = bswap_64(self->attr_size);
 640
 641                 if (attr_size != sizeof(struct perf_file_attr))
 642                         return -1;
 643
 644                 mem_bswap_64(self, offsetof(struct perf_file_header,
 645                                             adds_features));
 646                 ph->needs_swap = true;
 647         }
 648
 649         if (self->size != sizeof(*self)) {
 650                 /* Support the previous format */
 651                 if (self->size == offsetof(typeof(*self), adds_features))
 652                         bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
 653                 else
 654                         return -1;
 655         }
 656
 657         memcpy(&ph->adds_features, &self->adds_features,
 658                sizeof(ph->adds_features));
 659         /*
 660          * FIXME: hack that assumes that if we need swap the perf.data file
 661          * may be coming from an arch with a different word-size, ergo different
 662          * DEFINE_BITMAP format, investigate more later, but for now its mostly
 663          * safe to assume that we have a build-id section. Trace files probably
 664          * have several other issues in this realm anyway...
 665          */
 666         if (ph->needs_swap) {
 667                 memset(&ph->adds_features, 0, sizeof(ph->adds_features));
 668                 perf_header__set_feat(ph, HEADER_BUILD_ID);
 669         }
 670
 671         ph->event_offset = self->event_types.offset;
 672         ph->event_size   = self->event_types.size;
 673         ph->data_offset  = self->data.offset;
 674         ph->data_size    = self->data.size;
 675         return 0;
 676 }
 677
 678 static int __event_process_build_id(struct build_id_event *bev,
 679                                     char *filename,
 680                                     struct perf_session *session)
 681 {
 682         int err = -1;
 683         struct list_head *head;
 684         struct machine *machine;
 685         u16 misc;
 686         struct dso *dso;
 687         enum dso_kernel_type dso_type;
 688
 689         machine = perf_session__findnew_machine(session, bev->pid);
 690         if (!machine)
 691                 goto out;
 692
 693         misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 694
 695         switch (misc) {
 696         case PERF_RECORD_MISC_KERNEL:
 697                 dso_type = DSO_TYPE_KERNEL;
 698                 head = &machine->kernel_dsos;
 699                 break;
 700         case PERF_RECORD_MISC_GUEST_KERNEL:
 701                 dso_type = DSO_TYPE_GUEST_KERNEL;
 702                 head = &machine->kernel_dsos;
 703                 break;
 704         case PERF_RECORD_MISC_USER:
 705         case PERF_RECORD_MISC_GUEST_USER:
 706                 dso_type = DSO_TYPE_USER;
 707                 head = &machine->user_dsos;
 708                 break;
 709         default:
 710                 goto out;
 711         }
 712
 713         dso = __dsos__findnew(head, filename);
 714         if (dso != NULL) {
 715                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 716
 717                 dso__set_build_id(dso, &bev->build_id);
 718
 719                 if (filename[0] == '[')
 720                         dso->kernel = dso_type;
 721
 722                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
 723                                   sbuild_id);
 724                 pr_debug("build id event received for %s: %s\n",
 725                          dso->long_name, sbuild_id);
 726         }
 727
 728         err = 0;
 729 out:
 730         return err;
 731 }
 732
 733 static int perf_header__read_build_ids(struct perf_header *self,
 734                         int input, u64 offset, u64 size)
 735 {
 736         struct perf_session *session = container_of(self,
 737                         struct perf_session, header);
 738         struct build_id_event bev;
 739         char filename[PATH_MAX];
 740         u64 limit = offset + size;
 741         int err = -1;
 742
 743         while (offset < limit) {
 744                 ssize_t len;
 745
 746                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
 747                         goto out;
 748
 749                 if (self->needs_swap)
 750                         perf_event_header__bswap(&bev.header);
 751
 752                 len = bev.header.size - sizeof(bev);
 753                 if (read(input, filename, len) != len)
 754                         goto out;
 755
 756                 __event_process_build_id(&bev, filename, session);
 757
 758                 offset += bev.header.size;
 759         }
 760         err = 0;
 761 out:
 762         return err;
 763 }
 764
 765 static int perf_file_section__process(struct perf_file_section *self,
 766                                       struct perf_header *ph,
 767                                       int feat, int fd)
 768 {
 769         if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {
 770                 pr_debug("Failed to lseek to %Ld offset for feature %d, "
 771                          "continuing...\n", self->offset, feat);
 772                 return 0;
 773         }
 774
 775         switch (feat) {
 776         case HEADER_TRACE_INFO:
 777                 trace_report(fd, false);
 778                 break;
 779
 780         case HEADER_BUILD_ID:
 781                 if (perf_header__read_build_ids(ph, fd, self->offset, self->size))
 782                         pr_debug("Failed to read buildids, continuing...\n");
 783                 break;
 784         default:
 785                 pr_debug("unknown feature %d, continuing...\n", feat);
 786         }
 787
 788         return 0;
 789 }
 790
 791 static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
 792                                        struct perf_header *ph, int fd,
 793                                        bool repipe)
 794 {
 795         if (do_read(fd, self, sizeof(*self)) <= 0 ||
 796             memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
 797                 return -1;
 798
 799         if (repipe && do_write(STDOUT_FILENO, self, sizeof(*self)) < 0)
 800                 return -1;
 801
 802         if (self->size != sizeof(*self)) {
 803                 u64 size = bswap_64(self->size);
 804
 805                 if (size != sizeof(*self))
 806                         return -1;
 807
 808                 ph->needs_swap = true;
 809         }
 810
 811         return 0;
 812 }
 813
 814 static int perf_header__read_pipe(struct perf_session *session, int fd)
 815 {
 816         struct perf_header *self = &session->header;
 817         struct perf_pipe_file_header f_header;
 818
 819         if (perf_file_header__read_pipe(&f_header, self, fd,
 820                                         session->repipe) < 0) {
 821                 pr_debug("incompatible file format\n");
 822                 return -EINVAL;
 823         }
 824
 825         session->fd = fd;
 826
 827         return 0;
 828 }
 829
 830 int perf_header__read(struct perf_session *session, int fd)
 831 {
 832         struct perf_header *self = &session->header;
 833         struct perf_file_header f_header;
 834         struct perf_file_attr   f_attr;
 835         u64                     f_id;
 836         int nr_attrs, nr_ids, i, j;
 837
 838         if (session->fd_pipe)
 839                 return perf_header__read_pipe(session, fd);
 840
 841         if (perf_file_header__read(&f_header, self, fd) < 0) {
 842                 pr_debug("incompatible file format\n");
 843                 return -EINVAL;
 844         }
 845
 846         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 847         lseek(fd, f_header.attrs.offset, SEEK_SET);
 848
 849         for (i = 0; i < nr_attrs; i++) {
 850                 struct perf_header_attr *attr;
 851                 off_t tmp;
 852
 853                 if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr)))
 854                         goto out_errno;
 855
 856                 tmp = lseek(fd, 0, SEEK_CUR);
 857
 858                 attr = perf_header_attr__new(&f_attr.attr);
 859                 if (attr == NULL)
 860                          return -ENOMEM;
 861
 862                 nr_ids = f_attr.ids.size / sizeof(u64);
 863                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 864
 865                 for (j = 0; j < nr_ids; j++) {
 866                         if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id)))
 867                                 goto out_errno;
 868
 869                         if (perf_header_attr__add_id(attr, f_id) < 0) {
 870                                 perf_header_attr__delete(attr);
 871                                 return -ENOMEM;
 872                         }
 873                 }
 874                 if (perf_header__add_attr(self, attr) < 0) {
 875                         perf_header_attr__delete(attr);
 876                         return -ENOMEM;
 877                 }
 878
 879                 lseek(fd, tmp, SEEK_SET);
 880         }
 881
 882         if (f_header.event_types.size) {
 883                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 884                 events = malloc(f_header.event_types.size);
 885                 if (events == NULL)
 886                         return -ENOMEM;
 887                 if (perf_header__getbuffer64(self, fd, events,
 888                                              f_header.event_types.size))
 889                         goto out_errno;
 890                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 891         }
 892
 893         perf_header__process_sections(self, fd, perf_file_section__process);
 894
 895         lseek(fd, self->data_offset, SEEK_SET);
 896
 897         self->frozen = 1;
 898         return 0;
 899 out_errno:
 900         return -errno;
 901 }
 902
 903 u64 perf_header__sample_type(struct perf_header *header)
 904 {
 905         u64 type = 0;
 906         int i;
 907
 908         for (i = 0; i < header->attrs; i++) {
 909                 struct perf_header_attr *attr = header->attr[i];
 910
 911                 if (!type)
 912                         type = attr->attr.sample_type;
 913                 else if (type != attr->attr.sample_type)
 914                         die("non matching sample_type");
 915         }
 916
 917         return type;
 918 }
 919
 920 struct perf_event_attr *
 921 perf_header__find_attr(u64 id, struct perf_header *header)
 922 {
 923         int i;
 924
 925         /*
 926          * We set id to -1 if the data file doesn't contain sample
 927          * ids. Check for this and avoid walking through the entire
 928          * list of ids which may be large.
 929          */
 930         if (id == -1ULL)
 931                 return NULL;
 932
 933         for (i = 0; i < header->attrs; i++) {
 934                 struct perf_header_attr *attr = header->attr[i];
 935                 int j;
 936
 937                 for (j = 0; j < attr->ids; j++) {
 938                         if (attr->id[j] == id)
 939                                 return &attr->attr;
 940                 }
 941         }
 942
 943         return NULL;
 944 }
 945
 946 int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
 947                            event__handler_t process,
 948                            struct perf_session *session)
 949 {
 950         event_t *ev;
 951         size_t size;
 952         int err;
 953
 954         size = sizeof(struct perf_event_attr);
 955         size = ALIGN(size, sizeof(u64));
 956         size += sizeof(struct perf_event_header);
 957         size += ids * sizeof(u64);
 958
 959         ev = malloc(size);
 960
 961         ev->attr.attr = *attr;
 962         memcpy(ev->attr.id, id, ids * sizeof(u64));
 963
 964         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
 965         ev->attr.header.size = size;
 966
 967         err = process(ev, session);
 968
 969         free(ev);
 970
 971         return err;
 972 }
 973
 974 int event__synthesize_attrs(struct perf_header *self,
 975                             event__handler_t process,
 976                             struct perf_session *session)
 977 {
 978         struct perf_header_attr *attr;
 979         int i, err = 0;
 980
 981         for (i = 0; i < self->attrs; i++) {
 982                 attr = self->attr[i];
 983
 984                 err = event__synthesize_attr(&attr->attr, attr->ids, attr->id,
 985                                              process, session);
 986                 if (err) {
 987                         pr_debug("failed to create perf header attribute\n");
 988                         return err;
 989                 }
 990         }
 991
 992         return err;
 993 }
 994
 995 int event__process_attr(event_t *self, struct perf_session *session)
 996 {
 997         struct perf_header_attr *attr;
 998         unsigned int i, ids, n_ids;
 999
1000         attr = perf_header_attr__new(&self->attr.attr);
1001         if (attr == NULL)
1002                 return -ENOMEM;
1003
1004         ids = self->header.size;
1005         ids -= (void *)&self->attr.id - (void *)self;
1006         n_ids = ids / sizeof(u64);
1007
1008         for (i = 0; i < n_ids; i++) {
1009                 if (perf_header_attr__add_id(attr, self->attr.id[i]) < 0) {
1010                         perf_header_attr__delete(attr);
1011                         return -ENOMEM;
1012                 }
1013         }
1014
1015         if (perf_header__add_attr(&session->header, attr) < 0) {
1016                 perf_header_attr__delete(attr);
1017                 return -ENOMEM;
1018         }
1019
1020         perf_session__update_sample_type(session);
1021
1022         return 0;
1023 }
1024
1025 int event__synthesize_event_type(u64 event_id, char *name,
1026                                  event__handler_t process,
1027                                  struct perf_session *session)
1028 {
1029         event_t ev;
1030         size_t size = 0;
1031         int err = 0;
1032
1033         memset(&ev, 0, sizeof(ev));
1034
1035         ev.event_type.event_type.event_id = event_id;
1036         memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
1037         strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
1038
1039         ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
1040         size = strlen(name);
1041         size = ALIGN(size, sizeof(u64));
1042         ev.event_type.header.size = sizeof(ev.event_type) -
1043                 (sizeof(ev.event_type.event_type.name) - size);
1044
1045         err = process(&ev, session);
1046
1047         return err;
1048 }
1049
1050 int event__synthesize_event_types(event__handler_t process,
1051                                   struct perf_session *session)
1052 {
1053         struct perf_trace_event_type *type;
1054         int i, err = 0;
1055
1056         for (i = 0; i < event_count; i++) {
1057                 type = &events[i];
1058
1059                 err = event__synthesize_event_type(type->event_id, type->name,
1060                                                    process, session);
1061                 if (err) {
1062                         pr_debug("failed to create perf header event type\n");
1063                         return err;
1064                 }
1065         }
1066
1067         return err;
1068 }
1069
1070 int event__process_event_type(event_t *self,
1071                               struct perf_session *session __unused)
1072 {
1073         if (perf_header__push_event(self->event_type.event_type.event_id,
1074                                     self->event_type.event_type.name) < 0)
1075                 return -ENOMEM;
1076
1077         return 0;
1078 }
1079
1080 int event__synthesize_tracing_data(int fd, struct perf_event_attr *pattrs,
1081                                    int nb_events,
1082                                    event__handler_t process,
1083                                    struct perf_session *session __unused)
1084 {
1085         event_t ev;
1086         ssize_t size = 0, aligned_size = 0, padding;
1087         int err = 0;
1088
1089         memset(&ev, 0, sizeof(ev));
1090
1091         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1092         size = read_tracing_data_size(fd, pattrs, nb_events);
1093         if (size <= 0)
1094                 return size;
1095         aligned_size = ALIGN(size, sizeof(u64));
1096         padding = aligned_size - size;
1097         ev.tracing_data.header.size = sizeof(ev.tracing_data);
1098         ev.tracing_data.size = aligned_size;
1099
1100         process(&ev, session);
1101
1102         err = read_tracing_data(fd, pattrs, nb_events);
1103         write_padded(fd, NULL, 0, padding);
1104
1105         return aligned_size;
1106 }
1107
1108 int event__process_tracing_data(event_t *self,
1109                                 struct perf_session *session)
1110 {
1111         ssize_t size_read, padding, size = self->tracing_data.size;
1112         off_t offset = lseek(session->fd, 0, SEEK_CUR);
1113         char buf[BUFSIZ];
1114
1115         /* setup for reading amidst mmap */
1116         lseek(session->fd, offset + sizeof(struct tracing_data_event),
1117               SEEK_SET);
1118
1119         size_read = trace_report(session->fd, session->repipe);
1120
1121         padding = ALIGN(size_read, sizeof(u64)) - size_read;
1122
1123         if (read(session->fd, buf, padding) < 0)
1124                 die("reading input file");
1125         if (session->repipe) {
1126                 int retw = write(STDOUT_FILENO, buf, padding);
1127                 if (retw <= 0 || retw != padding)
1128                         die("repiping tracing data padding");
1129         }
1130
1131         if (size_read + padding != size)
1132                 die("tracing data size mismatch");
1133
1134         return size_read + padding;
1135 }
1136
1137 int event__synthesize_build_id(struct dso *pos, u16 misc,
1138                                event__handler_t process,
1139                                struct machine *machine,
1140                                struct perf_session *session)
1141 {
1142         event_t ev;
1143         size_t len;
1144         int err = 0;
1145
1146         if (!pos->hit)
1147                 return err;
1148
1149         memset(&ev, 0, sizeof(ev));
1150
1151         len = pos->long_name_len + 1;
1152         len = ALIGN(len, NAME_ALIGN);
1153         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1154         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1155         ev.build_id.header.misc = misc;
1156         ev.build_id.pid = machine->pid;
1157         ev.build_id.header.size = sizeof(ev.build_id) + len;
1158         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1159
1160         err = process(&ev, session);
1161
1162         return err;
1163 }
1164
1165 int event__process_build_id(event_t *self,
1166                             struct perf_session *session)
1167 {
1168         __event_process_build_id(&self->build_id,
1169                                  self->build_id.filename,
1170                                  session);
1171         return 0;
1172 }