tools/perf/util/session.c

   1 #include <linux/kernel.h>
   2 #include <traceevent/event-parse.h>
   3
   4 #include <byteswap.h>
   5 #include <unistd.h>
   6 #include <sys/types.h>
   7 #include <sys/mman.h>
   8
   9 #include "evlist.h"
  10 #include "evsel.h"
  11 #include "session.h"
  12 #include "tool.h"
  13 #include "sort.h"
  14 #include "util.h"
  15 #include "cpumap.h"
  16 #include "perf_regs.h"
  17 #include "asm/bug.h"
  18 #include "auxtrace.h"
  19 #include "thread-stack.h"
  20
  21 static int perf_session__deliver_event(struct perf_session *session,
  22                                        union perf_event *event,
  23                                        struct perf_sample *sample,
  24                                        struct perf_tool *tool,
  25                                        u64 file_offset);
  26
  27 static int perf_session__open(struct perf_session *session)
  28 {
  29         struct perf_data_file *file = session->file;
  30
  31         if (perf_session__read_header(session) < 0) {
  32                 pr_err("incompatible file format (rerun with -v to learn more)");
  33                 return -1;
  34         }
  35
  36         if (perf_data_file__is_pipe(file))
  37                 return 0;
  38
  39         if (!perf_evlist__valid_sample_type(session->evlist)) {
  40                 pr_err("non matching sample_type");
  41                 return -1;
  42         }
  43
  44         if (!perf_evlist__valid_sample_id_all(session->evlist)) {
  45                 pr_err("non matching sample_id_all");
  46                 return -1;
  47         }
  48
  49         if (!perf_evlist__valid_read_format(session->evlist)) {
  50                 pr_err("non matching read_format");
  51                 return -1;
  52         }
  53
  54         return 0;
  55 }
  56
  57 void perf_session__set_id_hdr_size(struct perf_session *session)
  58 {
  59         u16 id_hdr_size = perf_evlist__id_hdr_size(session->evlist);
  60
  61         machines__set_id_hdr_size(&session->machines, id_hdr_size);
  62 }
  63
  64 int perf_session__create_kernel_maps(struct perf_session *session)
  65 {
  66         int ret = machine__create_kernel_maps(&session->machines.host);
  67
  68         if (ret >= 0)
  69                 ret = machines__create_guest_kernel_maps(&session->machines);
  70         return ret;
  71 }
  72
  73 static void perf_session__destroy_kernel_maps(struct perf_session *session)
  74 {
  75         machines__destroy_kernel_maps(&session->machines);
  76 }
  77
  78 static bool perf_session__has_comm_exec(struct perf_session *session)
  79 {
  80         struct perf_evsel *evsel;
  81
  82         evlist__for_each(session->evlist, evsel) {
  83                 if (evsel->attr.comm_exec)
  84                         return true;
  85         }
  86
  87         return false;
  88 }
  89
  90 static void perf_session__set_comm_exec(struct perf_session *session)
  91 {
  92         bool comm_exec = perf_session__has_comm_exec(session);
  93
  94         machines__set_comm_exec(&session->machines, comm_exec);
  95 }
  96
  97 static int ordered_events__deliver_event(struct ordered_events *oe,
  98                                          struct ordered_event *event)
  99 {
 100         struct perf_sample sample;
 101         struct perf_session *session = container_of(oe, struct perf_session,
 102                                                     ordered_events);
 103         int ret = perf_evlist__parse_sample(session->evlist, event->event, &sample);
 104
 105         if (ret) {
 106                 pr_err("Can't parse sample, err = %d\n", ret);
 107                 return ret;
 108         }
 109
 110         return perf_session__deliver_event(session, event->event, &sample,
 111                                            session->tool, event->file_offset);
 112 }
 113
 114 struct perf_session *perf_session__new(struct perf_data_file *file,
 115                                        bool repipe, struct perf_tool *tool)
 116 {
 117         struct perf_session *session = zalloc(sizeof(*session));
 118
 119         if (!session)
 120                 goto out;
 121
 122         session->repipe = repipe;
 123         session->tool   = tool;
 124         INIT_LIST_HEAD(&session->auxtrace_index);
 125         machines__init(&session->machines);
 126         ordered_events__init(&session->ordered_events, ordered_events__deliver_event);
 127
 128         if (file) {
 129                 if (perf_data_file__open(file))
 130                         goto out_delete;
 131
 132                 session->file = file;
 133
 134                 if (perf_data_file__is_read(file)) {
 135                         if (perf_session__open(session) < 0)
 136                                 goto out_close;
 137
 138                         perf_session__set_id_hdr_size(session);
 139                         perf_session__set_comm_exec(session);
 140                 }
 141         }
 142
 143         if (!file || perf_data_file__is_write(file)) {
 144                 /*
 145                  * In O_RDONLY mode this will be performed when reading the
 146                  * kernel MMAP event, in perf_event__process_mmap().
 147                  */
 148                 if (perf_session__create_kernel_maps(session) < 0)
 149                         pr_warning("Cannot read kernel map\n");
 150         }
 151
 152         if (tool && tool->ordering_requires_timestamps &&
 153             tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
 154                 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
 155                 tool->ordered_events = false;
 156         }
 157
 158         return session;
 159
 160  out_close:
 161         perf_data_file__close(file);
 162  out_delete:
 163         perf_session__delete(session);
 164  out:
 165         return NULL;
 166 }
 167
 168 static void perf_session__delete_threads(struct perf_session *session)
 169 {
 170         machine__delete_threads(&session->machines.host);
 171 }
 172
 173 void perf_session__delete(struct perf_session *session)
 174 {
 175         auxtrace__free(session);
 176         auxtrace_index__free(&session->auxtrace_index);
 177         perf_session__destroy_kernel_maps(session);
 178         perf_session__delete_threads(session);
 179         perf_env__exit(&session->header.env);
 180         machines__exit(&session->machines);
 181         if (session->file)
 182                 perf_data_file__close(session->file);
 183         free(session);
 184 }
 185
 186 static int process_event_synth_tracing_data_stub(struct perf_tool *tool
 187                                                  __maybe_unused,
 188                                                  union perf_event *event
 189                                                  __maybe_unused,
 190                                                  struct perf_session *session
 191                                                 __maybe_unused)
 192 {
 193         dump_printf(": unhandled!\n");
 194         return 0;
 195 }
 196
 197 static int process_event_synth_attr_stub(struct perf_tool *tool __maybe_unused,
 198                                          union perf_event *event __maybe_unused,
 199                                          struct perf_evlist **pevlist
 200                                          __maybe_unused)
 201 {
 202         dump_printf(": unhandled!\n");
 203         return 0;
 204 }
 205
 206 static int process_event_sample_stub(struct perf_tool *tool __maybe_unused,
 207                                      union perf_event *event __maybe_unused,
 208                                      struct perf_sample *sample __maybe_unused,
 209                                      struct perf_evsel *evsel __maybe_unused,
 210                                      struct machine *machine __maybe_unused)
 211 {
 212         dump_printf(": unhandled!\n");
 213         return 0;
 214 }
 215
 216 static int process_event_stub(struct perf_tool *tool __maybe_unused,
 217                               union perf_event *event __maybe_unused,
 218                               struct perf_sample *sample __maybe_unused,
 219                               struct machine *machine __maybe_unused)
 220 {
 221         dump_printf(": unhandled!\n");
 222         return 0;
 223 }
 224
 225 static int process_build_id_stub(struct perf_tool *tool __maybe_unused,
 226                                  union perf_event *event __maybe_unused,
 227                                  struct perf_session *session __maybe_unused)
 228 {
 229         dump_printf(": unhandled!\n");
 230         return 0;
 231 }
 232
 233 static int process_finished_round_stub(struct perf_tool *tool __maybe_unused,
 234                                        union perf_event *event __maybe_unused,
 235                                        struct ordered_events *oe __maybe_unused)
 236 {
 237         dump_printf(": unhandled!\n");
 238         return 0;
 239 }
 240
 241 static int process_finished_round(struct perf_tool *tool,
 242                                   union perf_event *event,
 243                                   struct ordered_events *oe);
 244
 245 static int process_id_index_stub(struct perf_tool *tool __maybe_unused,
 246                                  union perf_event *event __maybe_unused,
 247                                  struct perf_session *perf_session
 248                                  __maybe_unused)
 249 {
 250         dump_printf(": unhandled!\n");
 251         return 0;
 252 }
 253
 254 static int process_event_auxtrace_info_stub(struct perf_tool *tool __maybe_unused,
 255                                 union perf_event *event __maybe_unused,
 256                                 struct perf_session *session __maybe_unused)
 257 {
 258         dump_printf(": unhandled!\n");
 259         return 0;
 260 }
 261
 262 static int skipn(int fd, off_t n)
 263 {
 264         char buf[4096];
 265         ssize_t ret;
 266
 267         while (n > 0) {
 268                 ret = read(fd, buf, min(n, (off_t)sizeof(buf)));
 269                 if (ret <= 0)
 270                         return ret;
 271                 n -= ret;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static s64 process_event_auxtrace_stub(struct perf_tool *tool __maybe_unused,
 278                                        union perf_event *event,
 279                                        struct perf_session *session
 280                                        __maybe_unused)
 281 {
 282         dump_printf(": unhandled!\n");
 283         if (perf_data_file__is_pipe(session->file))
 284                 skipn(perf_data_file__fd(session->file), event->auxtrace.size);
 285         return event->auxtrace.size;
 286 }
 287
 288 static
 289 int process_event_auxtrace_error_stub(struct perf_tool *tool __maybe_unused,
 290                                       union perf_event *event __maybe_unused,
 291                                       struct perf_session *session __maybe_unused)
 292 {
 293         dump_printf(": unhandled!\n");
 294         return 0;
 295 }
 296
 297 void perf_tool__fill_defaults(struct perf_tool *tool)
 298 {
 299         if (tool->sample == NULL)
 300                 tool->sample = process_event_sample_stub;
 301         if (tool->mmap == NULL)
 302                 tool->mmap = process_event_stub;
 303         if (tool->mmap2 == NULL)
 304                 tool->mmap2 = process_event_stub;
 305         if (tool->comm == NULL)
 306                 tool->comm = process_event_stub;
 307         if (tool->fork == NULL)
 308                 tool->fork = process_event_stub;
 309         if (tool->exit == NULL)
 310                 tool->exit = process_event_stub;
 311         if (tool->lost == NULL)
 312                 tool->lost = perf_event__process_lost;
 313         if (tool->lost_samples == NULL)
 314                 tool->lost_samples = perf_event__process_lost_samples;
 315         if (tool->aux == NULL)
 316                 tool->aux = perf_event__process_aux;
 317         if (tool->itrace_start == NULL)
 318                 tool->itrace_start = perf_event__process_itrace_start;
 319         if (tool->context_switch == NULL)
 320                 tool->context_switch = perf_event__process_switch;
 321         if (tool->read == NULL)
 322                 tool->read = process_event_sample_stub;
 323         if (tool->throttle == NULL)
 324                 tool->throttle = process_event_stub;
 325         if (tool->unthrottle == NULL)
 326                 tool->unthrottle = process_event_stub;
 327         if (tool->attr == NULL)
 328                 tool->attr = process_event_synth_attr_stub;
 329         if (tool->tracing_data == NULL)
 330                 tool->tracing_data = process_event_synth_tracing_data_stub;
 331         if (tool->build_id == NULL)
 332                 tool->build_id = process_build_id_stub;
 333         if (tool->finished_round == NULL) {
 334                 if (tool->ordered_events)
 335                         tool->finished_round = process_finished_round;
 336                 else
 337                         tool->finished_round = process_finished_round_stub;
 338         }
 339         if (tool->id_index == NULL)
 340                 tool->id_index = process_id_index_stub;
 341         if (tool->auxtrace_info == NULL)
 342                 tool->auxtrace_info = process_event_auxtrace_info_stub;
 343         if (tool->auxtrace == NULL)
 344                 tool->auxtrace = process_event_auxtrace_stub;
 345         if (tool->auxtrace_error == NULL)
 346                 tool->auxtrace_error = process_event_auxtrace_error_stub;
 347 }
 348
 349 static void swap_sample_id_all(union perf_event *event, void *data)
 350 {
 351         void *end = (void *) event + event->header.size;
 352         int size = end - data;
 353
 354         BUG_ON(size % sizeof(u64));
 355         mem_bswap_64(data, size);
 356 }
 357
 358 static void perf_event__all64_swap(union perf_event *event,
 359                                    bool sample_id_all __maybe_unused)
 360 {
 361         struct perf_event_header *hdr = &event->header;
 362         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 363 }
 364
 365 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
 366 {
 367         event->comm.pid = bswap_32(event->comm.pid);
 368         event->comm.tid = bswap_32(event->comm.tid);
 369
 370         if (sample_id_all) {
 371                 void *data = &event->comm.comm;
 372
 373                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
 374                 swap_sample_id_all(event, data);
 375         }
 376 }
 377
 378 static void perf_event__mmap_swap(union perf_event *event,
 379                                   bool sample_id_all)
 380 {
 381         event->mmap.pid   = bswap_32(event->mmap.pid);
 382         event->mmap.tid   = bswap_32(event->mmap.tid);
 383         event->mmap.start = bswap_64(event->mmap.start);
 384         event->mmap.len   = bswap_64(event->mmap.len);
 385         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 386
 387         if (sample_id_all) {
 388                 void *data = &event->mmap.filename;
 389
 390                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
 391                 swap_sample_id_all(event, data);
 392         }
 393 }
 394
 395 static void perf_event__mmap2_swap(union perf_event *event,
 396                                   bool sample_id_all)
 397 {
 398         event->mmap2.pid   = bswap_32(event->mmap2.pid);
 399         event->mmap2.tid   = bswap_32(event->mmap2.tid);
 400         event->mmap2.start = bswap_64(event->mmap2.start);
 401         event->mmap2.len   = bswap_64(event->mmap2.len);
 402         event->mmap2.pgoff = bswap_64(event->mmap2.pgoff);
 403         event->mmap2.maj   = bswap_32(event->mmap2.maj);
 404         event->mmap2.min   = bswap_32(event->mmap2.min);
 405         event->mmap2.ino   = bswap_64(event->mmap2.ino);
 406
 407         if (sample_id_all) {
 408                 void *data = &event->mmap2.filename;
 409
 410                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
 411                 swap_sample_id_all(event, data);
 412         }
 413 }
 414 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 415 {
 416         event->fork.pid  = bswap_32(event->fork.pid);
 417         event->fork.tid  = bswap_32(event->fork.tid);
 418         event->fork.ppid = bswap_32(event->fork.ppid);
 419         event->fork.ptid = bswap_32(event->fork.ptid);
 420         event->fork.time = bswap_64(event->fork.time);
 421
 422         if (sample_id_all)
 423                 swap_sample_id_all(event, &event->fork + 1);
 424 }
 425
 426 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 427 {
 428         event->read.pid          = bswap_32(event->read.pid);
 429         event->read.tid          = bswap_32(event->read.tid);
 430         event->read.value        = bswap_64(event->read.value);
 431         event->read.time_enabled = bswap_64(event->read.time_enabled);
 432         event->read.time_running = bswap_64(event->read.time_running);
 433         event->read.id           = bswap_64(event->read.id);
 434
 435         if (sample_id_all)
 436                 swap_sample_id_all(event, &event->read + 1);
 437 }
 438
 439 static void perf_event__aux_swap(union perf_event *event, bool sample_id_all)
 440 {
 441         event->aux.aux_offset = bswap_64(event->aux.aux_offset);
 442         event->aux.aux_size   = bswap_64(event->aux.aux_size);
 443         event->aux.flags      = bswap_64(event->aux.flags);
 444
 445         if (sample_id_all)
 446                 swap_sample_id_all(event, &event->aux + 1);
 447 }
 448
 449 static void perf_event__itrace_start_swap(union perf_event *event,
 450                                           bool sample_id_all)
 451 {
 452         event->itrace_start.pid  = bswap_32(event->itrace_start.pid);
 453         event->itrace_start.tid  = bswap_32(event->itrace_start.tid);
 454
 455         if (sample_id_all)
 456                 swap_sample_id_all(event, &event->itrace_start + 1);
 457 }
 458
 459 static void perf_event__switch_swap(union perf_event *event, bool sample_id_all)
 460 {
 461         if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) {
 462                 event->context_switch.next_prev_pid =
 463                                 bswap_32(event->context_switch.next_prev_pid);
 464                 event->context_switch.next_prev_tid =
 465                                 bswap_32(event->context_switch.next_prev_tid);
 466         }
 467
 468         if (sample_id_all)
 469                 swap_sample_id_all(event, &event->context_switch + 1);
 470 }
 471
 472 static void perf_event__throttle_swap(union perf_event *event,
 473                                       bool sample_id_all)
 474 {
 475         event->throttle.time      = bswap_64(event->throttle.time);
 476         event->throttle.id        = bswap_64(event->throttle.id);
 477         event->throttle.stream_id = bswap_64(event->throttle.stream_id);
 478
 479         if (sample_id_all)
 480                 swap_sample_id_all(event, &event->throttle + 1);
 481 }
 482
 483 static u8 revbyte(u8 b)
 484 {
 485         int rev = (b >> 4) | ((b & 0xf) << 4);
 486         rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
 487         rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
 488         return (u8) rev;
 489 }
 490
 491 /*
 492  * XXX this is hack in attempt to carry flags bitfield
 493  * throught endian village. ABI says:
 494  *
 495  * Bit-fields are allocated from right to left (least to most significant)
 496  * on little-endian implementations and from left to right (most to least
 497  * significant) on big-endian implementations.
 498  *
 499  * The above seems to be byte specific, so we need to reverse each
 500  * byte of the bitfield. 'Internet' also says this might be implementation
 501  * specific and we probably need proper fix and carry perf_event_attr
 502  * bitfield flags in separate data file FEAT_ section. Thought this seems
 503  * to work for now.
 504  */
 505 static void swap_bitfield(u8 *p, unsigned len)
 506 {
 507         unsigned i;
 508
 509         for (i = 0; i < len; i++) {
 510                 *p = revbyte(*p);
 511                 p++;
 512         }
 513 }
 514
 515 /* exported for swapping attributes in file header */
 516 void perf_event__attr_swap(struct perf_event_attr *attr)
 517 {
 518         attr->type              = bswap_32(attr->type);
 519         attr->size              = bswap_32(attr->size);
 520
 521 #define bswap_safe(f, n)                                        \
 522         (attr->size > (offsetof(struct perf_event_attr, f) +    \
 523                        sizeof(attr->f) * (n)))
 524 #define bswap_field(f, sz)                      \
 525 do {                                            \
 526         if (bswap_safe(f, 0))                   \
 527                 attr->f = bswap_##sz(attr->f);  \
 528 } while(0)
 529 #define bswap_field_32(f) bswap_field(f, 32)
 530 #define bswap_field_64(f) bswap_field(f, 64)
 531
 532         bswap_field_64(config);
 533         bswap_field_64(sample_period);
 534         bswap_field_64(sample_type);
 535         bswap_field_64(read_format);
 536         bswap_field_32(wakeup_events);
 537         bswap_field_32(bp_type);
 538         bswap_field_64(bp_addr);
 539         bswap_field_64(bp_len);
 540         bswap_field_64(branch_sample_type);
 541         bswap_field_64(sample_regs_user);
 542         bswap_field_32(sample_stack_user);
 543         bswap_field_32(aux_watermark);
 544
 545         /*
 546          * After read_format are bitfields. Check read_format because
 547          * we are unable to use offsetof on bitfield.
 548          */
 549         if (bswap_safe(read_format, 1))
 550                 swap_bitfield((u8 *) (&attr->read_format + 1),
 551                               sizeof(u64));
 552 #undef bswap_field_64
 553 #undef bswap_field_32
 554 #undef bswap_field
 555 #undef bswap_safe
 556 }
 557
 558 static void perf_event__hdr_attr_swap(union perf_event *event,
 559                                       bool sample_id_all __maybe_unused)
 560 {
 561         size_t size;
 562
 563         perf_event__attr_swap(&event->attr.attr);
 564
 565         size = event->header.size;
 566         size -= (void *)&event->attr.id - (void *)event;
 567         mem_bswap_64(event->attr.id, size);
 568 }
 569
 570 static void perf_event__event_type_swap(union perf_event *event,
 571                                         bool sample_id_all __maybe_unused)
 572 {
 573         event->event_type.event_type.event_id =
 574                 bswap_64(event->event_type.event_type.event_id);
 575 }
 576
 577 static void perf_event__tracing_data_swap(union perf_event *event,
 578                                           bool sample_id_all __maybe_unused)
 579 {
 580         event->tracing_data.size = bswap_32(event->tracing_data.size);
 581 }
 582
 583 static void perf_event__auxtrace_info_swap(union perf_event *event,
 584                                            bool sample_id_all __maybe_unused)
 585 {
 586         size_t size;
 587
 588         event->auxtrace_info.type = bswap_32(event->auxtrace_info.type);
 589
 590         size = event->header.size;
 591         size -= (void *)&event->auxtrace_info.priv - (void *)event;
 592         mem_bswap_64(event->auxtrace_info.priv, size);
 593 }
 594
 595 static void perf_event__auxtrace_swap(union perf_event *event,
 596                                       bool sample_id_all __maybe_unused)
 597 {
 598         event->auxtrace.size      = bswap_64(event->auxtrace.size);
 599         event->auxtrace.offset    = bswap_64(event->auxtrace.offset);
 600         event->auxtrace.reference = bswap_64(event->auxtrace.reference);
 601         event->auxtrace.idx       = bswap_32(event->auxtrace.idx);
 602         event->auxtrace.tid       = bswap_32(event->auxtrace.tid);
 603         event->auxtrace.cpu       = bswap_32(event->auxtrace.cpu);
 604 }
 605
 606 static void perf_event__auxtrace_error_swap(union perf_event *event,
 607                                             bool sample_id_all __maybe_unused)
 608 {
 609         event->auxtrace_error.type = bswap_32(event->auxtrace_error.type);
 610         event->auxtrace_error.code = bswap_32(event->auxtrace_error.code);
 611         event->auxtrace_error.cpu  = bswap_32(event->auxtrace_error.cpu);
 612         event->auxtrace_error.pid  = bswap_32(event->auxtrace_error.pid);
 613         event->auxtrace_error.tid  = bswap_32(event->auxtrace_error.tid);
 614         event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
 615 }
 616
 617 typedef void (*perf_event__swap_op)(union perf_event *event,
 618                                     bool sample_id_all);
 619
 620 static perf_event__swap_op perf_event__swap_ops[] = {
 621         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 622         [PERF_RECORD_MMAP2]               = perf_event__mmap2_swap,
 623         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 624         [PERF_RECORD_FORK]                = perf_event__task_swap,
 625         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 626         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 627         [PERF_RECORD_READ]                = perf_event__read_swap,
 628         [PERF_RECORD_THROTTLE]            = perf_event__throttle_swap,
 629         [PERF_RECORD_UNTHROTTLE]          = perf_event__throttle_swap,
 630         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 631         [PERF_RECORD_AUX]                 = perf_event__aux_swap,
 632         [PERF_RECORD_ITRACE_START]        = perf_event__itrace_start_swap,
 633         [PERF_RECORD_LOST_SAMPLES]        = perf_event__all64_swap,
 634         [PERF_RECORD_SWITCH]              = perf_event__switch_swap,
 635         [PERF_RECORD_SWITCH_CPU_WIDE]     = perf_event__switch_swap,
 636         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 637         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 638         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 639         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 640         [PERF_RECORD_ID_INDEX]            = perf_event__all64_swap,
 641         [PERF_RECORD_AUXTRACE_INFO]       = perf_event__auxtrace_info_swap,
 642         [PERF_RECORD_AUXTRACE]            = perf_event__auxtrace_swap,
 643         [PERF_RECORD_AUXTRACE_ERROR]      = perf_event__auxtrace_error_swap,
 644         [PERF_RECORD_HEADER_MAX]          = NULL,
 645 };
 646
 647 /*
 648  * When perf record finishes a pass on every buffers, it records this pseudo
 649  * event.
 650  * We record the max timestamp t found in the pass n.
 651  * Assuming these timestamps are monotonic across cpus, we know that if
 652  * a buffer still has events with timestamps below t, they will be all
 653  * available and then read in the pass n + 1.
 654  * Hence when we start to read the pass n + 2, we can safely flush every
 655  * events with timestamps below t.
 656  *
 657  *    ============ PASS n =================
 658  *       CPU 0         |   CPU 1
 659  *                     |
 660  *    cnt1 timestamps  |   cnt2 timestamps
 661  *          1          |         2
 662  *          2          |         3
 663  *          -          |         4  <--- max recorded
 664  *
 665  *    ============ PASS n + 1 ==============
 666  *       CPU 0         |   CPU 1
 667  *                     |
 668  *    cnt1 timestamps  |   cnt2 timestamps
 669  *          3          |         5
 670  *          4          |         6
 671  *          5          |         7 <---- max recorded
 672  *
 673  *      Flush every events below timestamp 4
 674  *
 675  *    ============ PASS n + 2 ==============
 676  *       CPU 0         |   CPU 1
 677  *                     |
 678  *    cnt1 timestamps  |   cnt2 timestamps
 679  *          6          |         8
 680  *          7          |         9
 681  *          -          |         10
 682  *
 683  *      Flush every events below timestamp 7
 684  *      etc...
 685  */
 686 static int process_finished_round(struct perf_tool *tool __maybe_unused,
 687                                   union perf_event *event __maybe_unused,
 688                                   struct ordered_events *oe)
 689 {
 690         if (dump_trace)
 691                 fprintf(stdout, "\n");
 692         return ordered_events__flush(oe, OE_FLUSH__ROUND);
 693 }
 694
 695 int perf_session__queue_event(struct perf_session *s, union perf_event *event,
 696                               struct perf_sample *sample, u64 file_offset)
 697 {
 698         return ordered_events__queue(&s->ordered_events, event, sample, file_offset);
 699 }
 700
 701 static void callchain__lbr_callstack_printf(struct perf_sample *sample)
 702 {
 703         struct ip_callchain *callchain = sample->callchain;
 704         struct branch_stack *lbr_stack = sample->branch_stack;
 705         u64 kernel_callchain_nr = callchain->nr;
 706         unsigned int i;
 707
 708         for (i = 0; i < kernel_callchain_nr; i++) {
 709                 if (callchain->ips[i] == PERF_CONTEXT_USER)
 710                         break;
 711         }
 712
 713         if ((i != kernel_callchain_nr) && lbr_stack->nr) {
 714                 u64 total_nr;
 715                 /*
 716                  * LBR callstack can only get user call chain,
 717                  * i is kernel call chain number,
 718                  * 1 is PERF_CONTEXT_USER.
 719                  *
 720                  * The user call chain is stored in LBR registers.
 721                  * LBR are pair registers. The caller is stored
 722                  * in "from" register, while the callee is stored
 723                  * in "to" register.
 724                  * For example, there is a call stack
 725                  * "A"->"B"->"C"->"D".
 726                  * The LBR registers will recorde like
 727                  * "C"->"D", "B"->"C", "A"->"B".
 728                  * So only the first "to" register and all "from"
 729                  * registers are needed to construct the whole stack.
 730                  */
 731                 total_nr = i + 1 + lbr_stack->nr + 1;
 732                 kernel_callchain_nr = i + 1;
 733
 734                 printf("... LBR call chain: nr:%" PRIu64 "\n", total_nr);
 735
 736                 for (i = 0; i < kernel_callchain_nr; i++)
 737                         printf("..... %2d: %016" PRIx64 "\n",
 738                                i, callchain->ips[i]);
 739
 740                 printf("..... %2d: %016" PRIx64 "\n",
 741                        (int)(kernel_callchain_nr), lbr_stack->entries[0].to);
 742                 for (i = 0; i < lbr_stack->nr; i++)
 743                         printf("..... %2d: %016" PRIx64 "\n",
 744                                (int)(i + kernel_callchain_nr + 1), lbr_stack->entries[i].from);
 745         }
 746 }
 747
 748 static void callchain__printf(struct perf_evsel *evsel,
 749                               struct perf_sample *sample)
 750 {
 751         unsigned int i;
 752         struct ip_callchain *callchain = sample->callchain;
 753
 754         if (has_branch_callstack(evsel))
 755                 callchain__lbr_callstack_printf(sample);
 756
 757         printf("... FP chain: nr:%" PRIu64 "\n", callchain->nr);
 758
 759         for (i = 0; i < callchain->nr; i++)
 760                 printf("..... %2d: %016" PRIx64 "\n",
 761                        i, callchain->ips[i]);
 762 }
 763
 764 static void branch_stack__printf(struct perf_sample *sample)
 765 {
 766         uint64_t i;
 767
 768         printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
 769
 770         for (i = 0; i < sample->branch_stack->nr; i++) {
 771                 struct branch_entry *e = &sample->branch_stack->entries[i];
 772
 773                 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 " %hu cycles %s%s%s%s %x\n",
 774                         i, e->from, e->to,
 775                         e->flags.cycles,
 776                         e->flags.mispred ? "M" : " ",
 777                         e->flags.predicted ? "P" : " ",
 778                         e->flags.abort ? "A" : " ",
 779                         e->flags.in_tx ? "T" : " ",
 780                         (unsigned)e->flags.reserved);
 781         }
 782 }
 783
 784 static void regs_dump__printf(u64 mask, u64 *regs)
 785 {
 786         unsigned rid, i = 0;
 787
 788         for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
 789                 u64 val = regs[i++];
 790
 791                 printf(".... %-5s 0x%" PRIx64 "\n",
 792                        perf_reg_name(rid), val);
 793         }
 794 }
 795
 796 static const char *regs_abi[] = {
 797         [PERF_SAMPLE_REGS_ABI_NONE] = "none",
 798         [PERF_SAMPLE_REGS_ABI_32] = "32-bit",
 799         [PERF_SAMPLE_REGS_ABI_64] = "64-bit",
 800 };
 801
 802 static inline const char *regs_dump_abi(struct regs_dump *d)
 803 {
 804         if (d->abi > PERF_SAMPLE_REGS_ABI_64)
 805                 return "unknown";
 806
 807         return regs_abi[d->abi];
 808 }
 809
 810 static void regs__printf(const char *type, struct regs_dump *regs)
 811 {
 812         u64 mask = regs->mask;
 813
 814         printf("... %s regs: mask 0x%" PRIx64 " ABI %s\n",
 815                type,
 816                mask,
 817                regs_dump_abi(regs));
 818
 819         regs_dump__printf(mask, regs->regs);
 820 }
 821
 822 static void regs_user__printf(struct perf_sample *sample)
 823 {
 824         struct regs_dump *user_regs = &sample->user_regs;
 825
 826         if (user_regs->regs)
 827                 regs__printf("user", user_regs);
 828 }
 829
 830 static void regs_intr__printf(struct perf_sample *sample)
 831 {
 832         struct regs_dump *intr_regs = &sample->intr_regs;
 833
 834         if (intr_regs->regs)
 835                 regs__printf("intr", intr_regs);
 836 }
 837
 838 static void stack_user__printf(struct stack_dump *dump)
 839 {
 840         printf("... ustack: size %" PRIu64 ", offset 0x%x\n",
 841                dump->size, dump->offset);
 842 }
 843
 844 static void perf_evlist__print_tstamp(struct perf_evlist *evlist,
 845                                        union perf_event *event,
 846                                        struct perf_sample *sample)
 847 {
 848         u64 sample_type = __perf_evlist__combined_sample_type(evlist);
 849
 850         if (event->header.type != PERF_RECORD_SAMPLE &&
 851             !perf_evlist__sample_id_all(evlist)) {
 852                 fputs("-1 -1 ", stdout);
 853                 return;
 854         }
 855
 856         if ((sample_type & PERF_SAMPLE_CPU))
 857                 printf("%u ", sample->cpu);
 858
 859         if (sample_type & PERF_SAMPLE_TIME)
 860                 printf("%" PRIu64 " ", sample->time);
 861 }
 862
 863 static void sample_read__printf(struct perf_sample *sample, u64 read_format)
 864 {
 865         printf("... sample_read:\n");
 866
 867         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 868                 printf("...... time enabled %016" PRIx64 "\n",
 869                        sample->read.time_enabled);
 870
 871         if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 872                 printf("...... time running %016" PRIx64 "\n",
 873                        sample->read.time_running);
 874
 875         if (read_format & PERF_FORMAT_GROUP) {
 876                 u64 i;
 877
 878                 printf(".... group nr %" PRIu64 "\n", sample->read.group.nr);
 879
 880                 for (i = 0; i < sample->read.group.nr; i++) {
 881                         struct sample_read_value *value;
 882
 883                         value = &sample->read.group.values[i];
 884                         printf("..... id %016" PRIx64
 885                                ", value %016" PRIx64 "\n",
 886                                value->id, value->value);
 887                 }
 888         } else
 889                 printf("..... id %016" PRIx64 ", value %016" PRIx64 "\n",
 890                         sample->read.one.id, sample->read.one.value);
 891 }
 892
 893 static void dump_event(struct perf_evlist *evlist, union perf_event *event,
 894                        u64 file_offset, struct perf_sample *sample)
 895 {
 896         if (!dump_trace)
 897                 return;
 898
 899         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 900                file_offset, event->header.size, event->header.type);
 901
 902         trace_event(event);
 903
 904         if (sample)
 905                 perf_evlist__print_tstamp(evlist, event, sample);
 906
 907         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 908                event->header.size, perf_event__name(event->header.type));
 909 }
 910
 911 static void dump_sample(struct perf_evsel *evsel, union perf_event *event,
 912                         struct perf_sample *sample)
 913 {
 914         u64 sample_type;
 915
 916         if (!dump_trace)
 917                 return;
 918
 919         printf("(IP, 0x%x): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 920                event->header.misc, sample->pid, sample->tid, sample->ip,
 921                sample->period, sample->addr);
 922
 923         sample_type = evsel->attr.sample_type;
 924
 925         if (sample_type & PERF_SAMPLE_CALLCHAIN)
 926                 callchain__printf(evsel, sample);
 927
 928         if ((sample_type & PERF_SAMPLE_BRANCH_STACK) && !has_branch_callstack(evsel))
 929                 branch_stack__printf(sample);
 930
 931         if (sample_type & PERF_SAMPLE_REGS_USER)
 932                 regs_user__printf(sample);
 933
 934         if (sample_type & PERF_SAMPLE_REGS_INTR)
 935                 regs_intr__printf(sample);
 936
 937         if (sample_type & PERF_SAMPLE_STACK_USER)
 938                 stack_user__printf(&sample->user_stack);
 939
 940         if (sample_type & PERF_SAMPLE_WEIGHT)
 941                 printf("... weight: %" PRIu64 "\n", sample->weight);
 942
 943         if (sample_type & PERF_SAMPLE_DATA_SRC)
 944                 printf(" . data_src: 0x%"PRIx64"\n", sample->data_src);
 945
 946         if (sample_type & PERF_SAMPLE_TRANSACTION)
 947                 printf("... transaction: %" PRIx64 "\n", sample->transaction);
 948
 949         if (sample_type & PERF_SAMPLE_READ)
 950                 sample_read__printf(sample, evsel->attr.read_format);
 951 }
 952
 953 static struct machine *machines__find_for_cpumode(struct machines *machines,
 954                                                union perf_event *event,
 955                                                struct perf_sample *sample)
 956 {
 957         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 958         struct machine *machine;
 959
 960         if (perf_guest &&
 961             ((cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ||
 962              (cpumode == PERF_RECORD_MISC_GUEST_USER))) {
 963                 u32 pid;
 964
 965                 if (event->header.type == PERF_RECORD_MMAP
 966                     || event->header.type == PERF_RECORD_MMAP2)
 967                         pid = event->mmap.pid;
 968                 else
 969                         pid = sample->pid;
 970
 971                 machine = machines__find(machines, pid);
 972                 if (!machine)
 973                         machine = machines__find(machines, DEFAULT_GUEST_KERNEL_ID);
 974                 return machine;
 975         }
 976
 977         return &machines->host;
 978 }
 979
 980 static int deliver_sample_value(struct perf_evlist *evlist,
 981                                 struct perf_tool *tool,
 982                                 union perf_event *event,
 983                                 struct perf_sample *sample,
 984                                 struct sample_read_value *v,
 985                                 struct machine *machine)
 986 {
 987         struct perf_sample_id *sid = perf_evlist__id2sid(evlist, v->id);
 988
 989         if (sid) {
 990                 sample->id     = v->id;
 991                 sample->period = v->value - sid->period;
 992                 sid->period    = v->value;
 993         }
 994
 995         if (!sid || sid->evsel == NULL) {
 996                 ++evlist->stats.nr_unknown_id;
 997                 return 0;
 998         }
 999
1000         return tool->sample(tool, event, sample, sid->evsel, machine);
1001 }
1002
1003 static int deliver_sample_group(struct perf_evlist *evlist,
1004                                 struct perf_tool *tool,
1005                                 union  perf_event *event,
1006                                 struct perf_sample *sample,
1007                                 struct machine *machine)
1008 {
1009         int ret = -EINVAL;
1010         u64 i;
1011
1012         for (i = 0; i < sample->read.group.nr; i++) {
1013                 ret = deliver_sample_value(evlist, tool, event, sample,
1014                                            &sample->read.group.values[i],
1015                                            machine);
1016                 if (ret)
1017                         break;
1018         }
1019
1020         return ret;
1021 }
1022
1023 static int
1024  perf_evlist__deliver_sample(struct perf_evlist *evlist,
1025                              struct perf_tool *tool,
1026                              union  perf_event *event,
1027                              struct perf_sample *sample,
1028                              struct perf_evsel *evsel,
1029                              struct machine *machine)
1030 {
1031         /* We know evsel != NULL. */
1032         u64 sample_type = evsel->attr.sample_type;
1033         u64 read_format = evsel->attr.read_format;
1034
1035         /* Standard sample delievery. */
1036         if (!(sample_type & PERF_SAMPLE_READ))
1037                 return tool->sample(tool, event, sample, evsel, machine);
1038
1039         /* For PERF_SAMPLE_READ we have either single or group mode. */
1040         if (read_format & PERF_FORMAT_GROUP)
1041                 return deliver_sample_group(evlist, tool, event, sample,
1042                                             machine);
1043         else
1044                 return deliver_sample_value(evlist, tool, event, sample,
1045                                             &sample->read.one, machine);
1046 }
1047
1048 static int machines__deliver_event(struct machines *machines,
1049                                    struct perf_evlist *evlist,
1050                                    union perf_event *event,
1051                                    struct perf_sample *sample,
1052                                    struct perf_tool *tool, u64 file_offset)
1053 {
1054         struct perf_evsel *evsel;
1055         struct machine *machine;
1056
1057         dump_event(evlist, event, file_offset, sample);
1058
1059         evsel = perf_evlist__id2evsel(evlist, sample->id);
1060
1061         machine = machines__find_for_cpumode(machines, event, sample);
1062
1063         switch (event->header.type) {
1064         case PERF_RECORD_SAMPLE:
1065                 if (evsel == NULL) {
1066                         ++evlist->stats.nr_unknown_id;
1067                         return 0;
1068                 }
1069                 dump_sample(evsel, event, sample);
1070                 if (machine == NULL) {
1071                         ++evlist->stats.nr_unprocessable_samples;
1072                         return 0;
1073                 }
1074                 return perf_evlist__deliver_sample(evlist, tool, event, sample, evsel, machine);
1075         case PERF_RECORD_MMAP:
1076                 return tool->mmap(tool, event, sample, machine);
1077         case PERF_RECORD_MMAP2:
1078                 if (event->header.misc & PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT)
1079                         ++evlist->stats.nr_proc_map_timeout;
1080                 return tool->mmap2(tool, event, sample, machine);
1081         case PERF_RECORD_COMM:
1082                 return tool->comm(tool, event, sample, machine);
1083         case PERF_RECORD_FORK:
1084                 return tool->fork(tool, event, sample, machine);
1085         case PERF_RECORD_EXIT:
1086                 return tool->exit(tool, event, sample, machine);
1087         case PERF_RECORD_LOST:
1088                 if (tool->lost == perf_event__process_lost)
1089                         evlist->stats.total_lost += event->lost.lost;
1090                 return tool->lost(tool, event, sample, machine);
1091         case PERF_RECORD_LOST_SAMPLES:
1092                 if (tool->lost_samples == perf_event__process_lost_samples)
1093                         evlist->stats.total_lost_samples += event->lost_samples.lost;
1094                 return tool->lost_samples(tool, event, sample, machine);
1095         case PERF_RECORD_READ:
1096                 return tool->read(tool, event, sample, evsel, machine);
1097         case PERF_RECORD_THROTTLE:
1098                 return tool->throttle(tool, event, sample, machine);
1099         case PERF_RECORD_UNTHROTTLE:
1100                 return tool->unthrottle(tool, event, sample, machine);
1101         case PERF_RECORD_AUX:
1102                 return tool->aux(tool, event, sample, machine);
1103         case PERF_RECORD_ITRACE_START:
1104                 return tool->itrace_start(tool, event, sample, machine);
1105         case PERF_RECORD_SWITCH:
1106         case PERF_RECORD_SWITCH_CPU_WIDE:
1107                 return tool->context_switch(tool, event, sample, machine);
1108         default:
1109                 ++evlist->stats.nr_unknown_events;
1110                 return -1;
1111         }
1112 }
1113
1114 static int perf_session__deliver_event(struct perf_session *session,
1115                                        union perf_event *event,
1116                                        struct perf_sample *sample,
1117                                        struct perf_tool *tool,
1118                                        u64 file_offset)
1119 {
1120         int ret;
1121
1122         ret = auxtrace__process_event(session, event, sample, tool);
1123         if (ret < 0)
1124                 return ret;
1125         if (ret > 0)
1126                 return 0;
1127
1128         return machines__deliver_event(&session->machines, session->evlist,
1129                                        event, sample, tool, file_offset);
1130 }
1131
1132 static s64 perf_session__process_user_event(struct perf_session *session,
1133                                             union perf_event *event,
1134                                             u64 file_offset)
1135 {
1136         struct ordered_events *oe = &session->ordered_events;
1137         struct perf_tool *tool = session->tool;
1138         int fd = perf_data_file__fd(session->file);
1139         int err;
1140
1141         dump_event(session->evlist, event, file_offset, NULL);
1142
1143         /* These events are processed right away */
1144         switch (event->header.type) {
1145         case PERF_RECORD_HEADER_ATTR:
1146                 err = tool->attr(tool, event, &session->evlist);
1147                 if (err == 0) {
1148                         perf_session__set_id_hdr_size(session);
1149                         perf_session__set_comm_exec(session);
1150                 }
1151                 return err;
1152         case PERF_RECORD_HEADER_EVENT_TYPE:
1153                 /*
1154                  * Depreceated, but we need to handle it for sake
1155                  * of old data files create in pipe mode.
1156                  */
1157                 return 0;
1158         case PERF_RECORD_HEADER_TRACING_DATA:
1159                 /* setup for reading amidst mmap */
1160                 lseek(fd, file_offset, SEEK_SET);
1161                 return tool->tracing_data(tool, event, session);
1162         case PERF_RECORD_HEADER_BUILD_ID:
1163                 return tool->build_id(tool, event, session);
1164         case PERF_RECORD_FINISHED_ROUND:
1165                 return tool->finished_round(tool, event, oe);
1166         case PERF_RECORD_ID_INDEX:
1167                 return tool->id_index(tool, event, session);
1168         case PERF_RECORD_AUXTRACE_INFO:
1169                 return tool->auxtrace_info(tool, event, session);
1170         case PERF_RECORD_AUXTRACE:
1171                 /* setup for reading amidst mmap */
1172                 lseek(fd, file_offset + event->header.size, SEEK_SET);
1173                 return tool->auxtrace(tool, event, session);
1174         case PERF_RECORD_AUXTRACE_ERROR:
1175                 perf_session__auxtrace_error_inc(session, event);
1176                 return tool->auxtrace_error(tool, event, session);
1177         default:
1178                 return -EINVAL;
1179         }
1180 }
1181
1182 int perf_session__deliver_synth_event(struct perf_session *session,
1183                                       union perf_event *event,
1184                                       struct perf_sample *sample)
1185 {
1186         struct perf_evlist *evlist = session->evlist;
1187         struct perf_tool *tool = session->tool;
1188
1189         events_stats__inc(&evlist->stats, event->header.type);
1190
1191         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
1192                 return perf_session__process_user_event(session, event, 0);
1193
1194         return machines__deliver_event(&session->machines, evlist, event, sample, tool, 0);
1195 }
1196
1197 static void event_swap(union perf_event *event, bool sample_id_all)
1198 {
1199         perf_event__swap_op swap;
1200
1201         swap = perf_event__swap_ops[event->header.type];
1202         if (swap)
1203                 swap(event, sample_id_all);
1204 }
1205
1206 int perf_session__peek_event(struct perf_session *session, off_t file_offset,
1207                              void *buf, size_t buf_sz,
1208                              union perf_event **event_ptr,
1209                              struct perf_sample *sample)
1210 {
1211         union perf_event *event;
1212         size_t hdr_sz, rest;
1213         int fd;
1214
1215         if (session->one_mmap && !session->header.needs_swap) {
1216                 event = file_offset - session->one_mmap_offset +
1217                         session->one_mmap_addr;
1218                 goto out_parse_sample;
1219         }
1220
1221         if (perf_data_file__is_pipe(session->file))
1222                 return -1;
1223
1224         fd = perf_data_file__fd(session->file);
1225         hdr_sz = sizeof(struct perf_event_header);
1226
1227         if (buf_sz < hdr_sz)
1228                 return -1;
1229
1230         if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 ||
1231             readn(fd, buf, hdr_sz) != (ssize_t)hdr_sz)
1232                 return -1;
1233
1234         event = (union perf_event *)buf;
1235
1236         if (session->header.needs_swap)
1237                 perf_event_header__bswap(&event->header);
1238
1239         if (event->header.size < hdr_sz || event->header.size > buf_sz)
1240                 return -1;
1241
1242         rest = event->header.size - hdr_sz;
1243
1244         if (readn(fd, buf, rest) != (ssize_t)rest)
1245                 return -1;
1246
1247         if (session->header.needs_swap)
1248                 event_swap(event, perf_evlist__sample_id_all(session->evlist));
1249
1250 out_parse_sample:
1251
1252         if (sample && event->header.type < PERF_RECORD_USER_TYPE_START &&
1253             perf_evlist__parse_sample(session->evlist, event, sample))
1254                 return -1;
1255
1256         *event_ptr = event;
1257
1258         return 0;
1259 }
1260
1261 static s64 perf_session__process_event(struct perf_session *session,
1262                                        union perf_event *event, u64 file_offset)
1263 {
1264         struct perf_evlist *evlist = session->evlist;
1265         struct perf_tool *tool = session->tool;
1266         struct perf_sample sample;
1267         int ret;
1268
1269         if (session->header.needs_swap)
1270                 event_swap(event, perf_evlist__sample_id_all(evlist));
1271
1272         if (event->header.type >= PERF_RECORD_HEADER_MAX)
1273                 return -EINVAL;
1274
1275         events_stats__inc(&evlist->stats, event->header.type);
1276
1277         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
1278                 return perf_session__process_user_event(session, event, file_offset);
1279
1280         /*
1281          * For all kernel events we get the sample data
1282          */
1283         ret = perf_evlist__parse_sample(evlist, event, &sample);
1284         if (ret)
1285                 return ret;
1286
1287         if (tool->ordered_events) {
1288                 ret = perf_session__queue_event(session, event, &sample, file_offset);
1289                 if (ret != -ETIME)
1290                         return ret;
1291         }
1292
1293         return perf_session__deliver_event(session, event, &sample, tool,
1294                                            file_offset);
1295 }
1296
1297 void perf_event_header__bswap(struct perf_event_header *hdr)
1298 {
1299         hdr->type = bswap_32(hdr->type);
1300         hdr->misc = bswap_16(hdr->misc);
1301         hdr->size = bswap_16(hdr->size);
1302 }
1303
1304 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
1305 {
1306         return machine__findnew_thread(&session->machines.host, -1, pid);
1307 }
1308
1309 static struct thread *perf_session__register_idle_thread(struct perf_session *session)
1310 {
1311         struct thread *thread;
1312
1313         thread = machine__findnew_thread(&session->machines.host, 0, 0);
1314         if (thread == NULL || thread__set_comm(thread, "swapper", 0)) {
1315                 pr_err("problem inserting idle task.\n");
1316                 thread = NULL;
1317         }
1318
1319         return thread;
1320 }
1321
1322 static void perf_session__warn_about_errors(const struct perf_session *session)
1323 {
1324         const struct events_stats *stats = &session->evlist->stats;
1325         const struct ordered_events *oe = &session->ordered_events;
1326
1327         if (session->tool->lost == perf_event__process_lost &&
1328             stats->nr_events[PERF_RECORD_LOST] != 0) {
1329                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1330                             "Check IO/CPU overload!\n\n",
1331                             stats->nr_events[0],
1332                             stats->nr_events[PERF_RECORD_LOST]);
1333         }
1334
1335         if (session->tool->lost_samples == perf_event__process_lost_samples) {
1336                 double drop_rate;
1337
1338                 drop_rate = (double)stats->total_lost_samples /
1339                             (double) (stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples);
1340                 if (drop_rate > 0.05) {
1341                         ui__warning("Processed %" PRIu64 " samples and lost %3.2f%% samples!\n\n",
1342                                     stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples,
1343                                     drop_rate * 100.0);
1344                 }
1345         }
1346
1347         if (stats->nr_unknown_events != 0) {
1348                 ui__warning("Found %u unknown events!\n\n"
1349                             "Is this an older tool processing a perf.data "
1350                             "file generated by a more recent tool?\n\n"
1351                             "If that is not the case, consider "
1352                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1353                             stats->nr_unknown_events);
1354         }
1355
1356         if (stats->nr_unknown_id != 0) {
1357                 ui__warning("%u samples with id not present in the header\n",
1358                             stats->nr_unknown_id);
1359         }
1360
1361         if (stats->nr_invalid_chains != 0) {
1362                 ui__warning("Found invalid callchains!\n\n"
1363                             "%u out of %u events were discarded for this reason.\n\n"
1364                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1365                             stats->nr_invalid_chains,
1366                             stats->nr_events[PERF_RECORD_SAMPLE]);
1367         }
1368
1369         if (stats->nr_unprocessable_samples != 0) {
1370                 ui__warning("%u unprocessable samples recorded.\n"
1371                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1372                             stats->nr_unprocessable_samples);
1373         }
1374
1375         if (oe->nr_unordered_events != 0)
1376                 ui__warning("%u out of order events recorded.\n", oe->nr_unordered_events);
1377
1378         events_stats__auxtrace_error_warn(stats);
1379
1380         if (stats->nr_proc_map_timeout != 0) {
1381                 ui__warning("%d map information files for pre-existing threads were\n"
1382                             "not processed, if there are samples for addresses they\n"
1383                             "will not be resolved, you may find out which are these\n"
1384                             "threads by running with -v and redirecting the output\n"
1385                             "to a file.\n"
1386                             "The time limit to process proc map is too short?\n"
1387                             "Increase it by --proc-map-timeout\n",
1388                             stats->nr_proc_map_timeout);
1389         }
1390 }
1391
1392 static int perf_session__flush_thread_stack(struct thread *thread,
1393                                             void *p __maybe_unused)
1394 {
1395         return thread_stack__flush(thread);
1396 }
1397
1398 static int perf_session__flush_thread_stacks(struct perf_session *session)
1399 {
1400         return machines__for_each_thread(&session->machines,
1401                                          perf_session__flush_thread_stack,
1402                                          NULL);
1403 }
1404
1405 volatile int session_done;
1406
1407 static int __perf_session__process_pipe_events(struct perf_session *session)
1408 {
1409         struct ordered_events *oe = &session->ordered_events;
1410         struct perf_tool *tool = session->tool;
1411         int fd = perf_data_file__fd(session->file);
1412         union perf_event *event;
1413         uint32_t size, cur_size = 0;
1414         void *buf = NULL;
1415         s64 skip = 0;
1416         u64 head;
1417         ssize_t err;
1418         void *p;
1419
1420         perf_tool__fill_defaults(tool);
1421
1422         head = 0;
1423         cur_size = sizeof(union perf_event);
1424
1425         buf = malloc(cur_size);
1426         if (!buf)
1427                 return -errno;
1428 more:
1429         event = buf;
1430         err = readn(fd, event, sizeof(struct perf_event_header));
1431         if (err <= 0) {
1432                 if (err == 0)
1433                         goto done;
1434
1435                 pr_err("failed to read event header\n");
1436                 goto out_err;
1437         }
1438
1439         if (session->header.needs_swap)
1440                 perf_event_header__bswap(&event->header);
1441
1442         size = event->header.size;
1443         if (size < sizeof(struct perf_event_header)) {
1444                 pr_err("bad event header size\n");
1445                 goto out_err;
1446         }
1447
1448         if (size > cur_size) {
1449                 void *new = realloc(buf, size);
1450                 if (!new) {
1451                         pr_err("failed to allocate memory to read event\n");
1452                         goto out_err;
1453                 }
1454                 buf = new;
1455                 cur_size = size;
1456                 event = buf;
1457         }
1458         p = event;
1459         p += sizeof(struct perf_event_header);
1460
1461         if (size - sizeof(struct perf_event_header)) {
1462                 err = readn(fd, p, size - sizeof(struct perf_event_header));
1463                 if (err <= 0) {
1464                         if (err == 0) {
1465                                 pr_err("unexpected end of event stream\n");
1466                                 goto done;
1467                         }
1468
1469                         pr_err("failed to read event data\n");
1470                         goto out_err;
1471                 }
1472         }
1473
1474         if ((skip = perf_session__process_event(session, event, head)) < 0) {
1475                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1476                        head, event->header.size, event->header.type);
1477                 err = -EINVAL;
1478                 goto out_err;
1479         }
1480
1481         head += size;
1482
1483         if (skip > 0)
1484                 head += skip;
1485
1486         if (!session_done())
1487                 goto more;
1488 done:
1489         /* do the final flush for ordered samples */
1490         err = ordered_events__flush(oe, OE_FLUSH__FINAL);
1491         if (err)
1492                 goto out_err;
1493         err = auxtrace__flush_events(session, tool);
1494         if (err)
1495                 goto out_err;
1496         err = perf_session__flush_thread_stacks(session);
1497 out_err:
1498         free(buf);
1499         perf_session__warn_about_errors(session);
1500         ordered_events__free(&session->ordered_events);
1501         auxtrace__free_events(session);
1502         return err;
1503 }
1504
1505 static union perf_event *
1506 fetch_mmaped_event(struct perf_session *session,
1507                    u64 head, size_t mmap_size, char *buf)
1508 {
1509         union perf_event *event;
1510
1511         /*
1512          * Ensure we have enough space remaining to read
1513          * the size of the event in the headers.
1514          */
1515         if (head + sizeof(event->header) > mmap_size)
1516                 return NULL;
1517
1518         event = (union perf_event *)(buf + head);
1519
1520         if (session->header.needs_swap)
1521                 perf_event_header__bswap(&event->header);
1522
1523         if (head + event->header.size > mmap_size) {
1524                 /* We're not fetching the event so swap back again */
1525                 if (session->header.needs_swap)
1526                         perf_event_header__bswap(&event->header);
1527                 return NULL;
1528         }
1529
1530         return event;
1531 }
1532
1533 /*
1534  * On 64bit we can mmap the data file in one go. No need for tiny mmap
1535  * slices. On 32bit we use 32MB.
1536  */
1537 #if BITS_PER_LONG == 64
1538 #define MMAP_SIZE ULLONG_MAX
1539 #define NUM_MMAPS 1
1540 #else
1541 #define MMAP_SIZE (32 * 1024 * 1024ULL)
1542 #define NUM_MMAPS 128
1543 #endif
1544
1545 static int __perf_session__process_events(struct perf_session *session,
1546                                           u64 data_offset, u64 data_size,
1547                                           u64 file_size)
1548 {
1549         struct ordered_events *oe = &session->ordered_events;
1550         struct perf_tool *tool = session->tool;
1551         int fd = perf_data_file__fd(session->file);
1552         u64 head, page_offset, file_offset, file_pos, size;
1553         int err, mmap_prot, mmap_flags, map_idx = 0;
1554         size_t  mmap_size;
1555         char *buf, *mmaps[NUM_MMAPS];
1556         union perf_event *event;
1557         struct ui_progress prog;
1558         s64 skip;
1559
1560         perf_tool__fill_defaults(tool);
1561
1562         page_offset = page_size * (data_offset / page_size);
1563         file_offset = page_offset;
1564         head = data_offset - page_offset;
1565
1566         if (data_size && (data_offset + data_size < file_size))
1567                 file_size = data_offset + data_size;
1568
1569         ui_progress__init(&prog, file_size, "Processing events...");
1570
1571         mmap_size = MMAP_SIZE;
1572         if (mmap_size > file_size) {
1573                 mmap_size = file_size;
1574                 session->one_mmap = true;
1575         }
1576
1577         memset(mmaps, 0, sizeof(mmaps));
1578
1579         mmap_prot  = PROT_READ;
1580         mmap_flags = MAP_SHARED;
1581
1582         if (session->header.needs_swap) {
1583                 mmap_prot  |= PROT_WRITE;
1584                 mmap_flags = MAP_PRIVATE;
1585         }
1586 remap:
1587         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, fd,
1588                    file_offset);
1589         if (buf == MAP_FAILED) {
1590                 pr_err("failed to mmap file\n");
1591                 err = -errno;
1592                 goto out_err;
1593         }
1594         mmaps[map_idx] = buf;
1595         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1596         file_pos = file_offset + head;
1597         if (session->one_mmap) {
1598                 session->one_mmap_addr = buf;
1599                 session->one_mmap_offset = file_offset;
1600         }
1601
1602 more:
1603         event = fetch_mmaped_event(session, head, mmap_size, buf);
1604         if (!event) {
1605                 if (mmaps[map_idx]) {
1606                         munmap(mmaps[map_idx], mmap_size);
1607                         mmaps[map_idx] = NULL;
1608                 }
1609
1610                 page_offset = page_size * (head / page_size);
1611                 file_offset += page_offset;
1612                 head -= page_offset;
1613                 goto remap;
1614         }
1615
1616         size = event->header.size;
1617
1618         if (size < sizeof(struct perf_event_header) ||
1619             (skip = perf_session__process_event(session, event, file_pos)) < 0) {
1620                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1621                        file_offset + head, event->header.size,
1622                        event->header.type);
1623                 err = -EINVAL;
1624                 goto out_err;
1625         }
1626
1627         if (skip)
1628                 size += skip;
1629
1630         head += size;
1631         file_pos += size;
1632
1633         ui_progress__update(&prog, size);
1634
1635         if (session_done())
1636                 goto out;
1637
1638         if (file_pos < file_size)
1639                 goto more;
1640
1641 out:
1642         /* do the final flush for ordered samples */
1643         err = ordered_events__flush(oe, OE_FLUSH__FINAL);
1644         if (err)
1645                 goto out_err;
1646         err = auxtrace__flush_events(session, tool);
1647         if (err)
1648                 goto out_err;
1649         err = perf_session__flush_thread_stacks(session);
1650 out_err:
1651         ui_progress__finish();
1652         perf_session__warn_about_errors(session);
1653         ordered_events__free(&session->ordered_events);
1654         auxtrace__free_events(session);
1655         session->one_mmap = false;
1656         return err;
1657 }
1658
1659 int perf_session__process_events(struct perf_session *session)
1660 {
1661         u64 size = perf_data_file__size(session->file);
1662         int err;
1663
1664         if (perf_session__register_idle_thread(session) == NULL)
1665                 return -ENOMEM;
1666
1667         if (!perf_data_file__is_pipe(session->file))
1668                 err = __perf_session__process_events(session,
1669                                                      session->header.data_offset,
1670                                                      session->header.data_size, size);
1671         else
1672                 err = __perf_session__process_pipe_events(session);
1673
1674         return err;
1675 }
1676
1677 bool perf_session__has_traces(struct perf_session *session, const char *msg)
1678 {
1679         struct perf_evsel *evsel;
1680
1681         evlist__for_each(session->evlist, evsel) {
1682                 if (evsel->attr.type == PERF_TYPE_TRACEPOINT)
1683                         return true;
1684         }
1685
1686         pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1687         return false;
1688 }
1689
1690 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1691                                      const char *symbol_name, u64 addr)
1692 {
1693         char *bracket;
1694         enum map_type i;
1695         struct ref_reloc_sym *ref;
1696
1697         ref = zalloc(sizeof(struct ref_reloc_sym));
1698         if (ref == NULL)
1699                 return -ENOMEM;
1700
1701         ref->name = strdup(symbol_name);
1702         if (ref->name == NULL) {
1703                 free(ref);
1704                 return -ENOMEM;
1705         }
1706
1707         bracket = strchr(ref->name, ']');
1708         if (bracket)
1709                 *bracket = '\0';
1710
1711         ref->addr = addr;
1712
1713         for (i = 0; i < MAP__NR_TYPES; ++i) {
1714                 struct kmap *kmap = map__kmap(maps[i]);
1715
1716                 if (!kmap)
1717                         continue;
1718                 kmap->ref_reloc_sym = ref;
1719         }
1720
1721         return 0;
1722 }
1723
1724 size_t perf_session__fprintf_dsos(struct perf_session *session, FILE *fp)
1725 {
1726         return machines__fprintf_dsos(&session->machines, fp);
1727 }
1728
1729 size_t perf_session__fprintf_dsos_buildid(struct perf_session *session, FILE *fp,
1730                                           bool (skip)(struct dso *dso, int parm), int parm)
1731 {
1732         return machines__fprintf_dsos_buildid(&session->machines, fp, skip, parm);
1733 }
1734
1735 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1736 {
1737         size_t ret;
1738         const char *msg = "";
1739
1740         if (perf_header__has_feat(&session->header, HEADER_AUXTRACE))
1741                 msg = " (excludes AUX area (e.g. instruction trace) decoded / synthesized events)";
1742
1743         ret = fprintf(fp, "\nAggregated stats:%s\n", msg);
1744
1745         ret += events_stats__fprintf(&session->evlist->stats, fp);
1746         return ret;
1747 }
1748
1749 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1750 {
1751         /*
1752          * FIXME: Here we have to actually print all the machines in this
1753          * session, not just the host...
1754          */
1755         return machine__fprintf(&session->machines.host, fp);
1756 }
1757
1758 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1759                                               unsigned int type)
1760 {
1761         struct perf_evsel *pos;
1762
1763         evlist__for_each(session->evlist, pos) {
1764                 if (pos->attr.type == type)
1765                         return pos;
1766         }
1767         return NULL;
1768 }
1769
1770 void perf_evsel__print_ip(struct perf_evsel *evsel, struct perf_sample *sample,
1771                           struct addr_location *al,
1772                           unsigned int print_opts, unsigned int stack_depth)
1773 {
1774         struct callchain_cursor_node *node;
1775         int print_ip = print_opts & PRINT_IP_OPT_IP;
1776         int print_sym = print_opts & PRINT_IP_OPT_SYM;
1777         int print_dso = print_opts & PRINT_IP_OPT_DSO;
1778         int print_symoffset = print_opts & PRINT_IP_OPT_SYMOFFSET;
1779         int print_oneline = print_opts & PRINT_IP_OPT_ONELINE;
1780         int print_srcline = print_opts & PRINT_IP_OPT_SRCLINE;
1781         char s = print_oneline ? ' ' : '\t';
1782
1783         if (symbol_conf.use_callchain && sample->callchain) {
1784                 struct addr_location node_al;
1785
1786                 if (thread__resolve_callchain(al->thread, evsel,
1787                                               sample, NULL, NULL,
1788                                               PERF_MAX_STACK_DEPTH) != 0) {
1789                         if (verbose)
1790                                 error("Failed to resolve callchain. Skipping\n");
1791                         return;
1792                 }
1793                 callchain_cursor_commit(&callchain_cursor);
1794
1795                 if (print_symoffset)
1796                         node_al = *al;
1797
1798                 while (stack_depth) {
1799                         u64 addr = 0;
1800
1801                         node = callchain_cursor_current(&callchain_cursor);
1802                         if (!node)
1803                                 break;
1804
1805                         if (node->sym && node->sym->ignore)
1806                                 goto next;
1807
1808                         if (print_ip)
1809                                 printf("%c%16" PRIx64, s, node->ip);
1810
1811                         if (node->map)
1812                                 addr = node->map->map_ip(node->map, node->ip);
1813
1814                         if (print_sym) {
1815                                 printf(" ");
1816                                 if (print_symoffset) {
1817                                         node_al.addr = addr;
1818                                         node_al.map  = node->map;
1819                                         symbol__fprintf_symname_offs(node->sym, &node_al, stdout);
1820                                 } else
1821                                         symbol__fprintf_symname(node->sym, stdout);
1822                         }
1823
1824                         if (print_dso) {
1825                                 printf(" (");
1826                                 map__fprintf_dsoname(node->map, stdout);
1827                                 printf(")");
1828                         }
1829
1830                         if (print_srcline)
1831                                 map__fprintf_srcline(node->map, addr, "\n  ",
1832                                                      stdout);
1833
1834                         if (!print_oneline)
1835                                 printf("\n");
1836
1837                         stack_depth--;
1838 next:
1839                         callchain_cursor_advance(&callchain_cursor);
1840                 }
1841
1842         } else {
1843                 if (al->sym && al->sym->ignore)
1844                         return;
1845
1846                 if (print_ip)
1847                         printf("%16" PRIx64, sample->ip);
1848
1849                 if (print_sym) {
1850                         printf(" ");
1851                         if (print_symoffset)
1852                                 symbol__fprintf_symname_offs(al->sym, al,
1853                                                              stdout);
1854                         else
1855                                 symbol__fprintf_symname(al->sym, stdout);
1856                 }
1857
1858                 if (print_dso) {
1859                         printf(" (");
1860                         map__fprintf_dsoname(al->map, stdout);
1861                         printf(")");
1862                 }
1863
1864                 if (print_srcline)
1865                         map__fprintf_srcline(al->map, al->addr, "\n  ", stdout);
1866         }
1867 }
1868
1869 int perf_session__cpu_bitmap(struct perf_session *session,
1870                              const char *cpu_list, unsigned long *cpu_bitmap)
1871 {
1872         int i, err = -1;
1873         struct cpu_map *map;
1874
1875         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1876                 struct perf_evsel *evsel;
1877
1878                 evsel = perf_session__find_first_evtype(session, i);
1879                 if (!evsel)
1880                         continue;
1881
1882                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1883                         pr_err("File does not contain CPU events. "
1884                                "Remove -c option to proceed.\n");
1885                         return -1;
1886                 }
1887         }
1888
1889         map = cpu_map__new(cpu_list);
1890         if (map == NULL) {
1891                 pr_err("Invalid cpu_list\n");
1892                 return -1;
1893         }
1894
1895         for (i = 0; i < map->nr; i++) {
1896                 int cpu = map->map[i];
1897
1898                 if (cpu >= MAX_NR_CPUS) {
1899                         pr_err("Requested CPU %d too large. "
1900                                "Consider raising MAX_NR_CPUS\n", cpu);
1901                         goto out_delete_map;
1902                 }
1903
1904                 set_bit(cpu, cpu_bitmap);
1905         }
1906
1907         err = 0;
1908
1909 out_delete_map:
1910         cpu_map__put(map);
1911         return err;
1912 }
1913
1914 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1915                                 bool full)
1916 {
1917         struct stat st;
1918         int fd, ret;
1919
1920         if (session == NULL || fp == NULL)
1921                 return;
1922
1923         fd = perf_data_file__fd(session->file);
1924
1925         ret = fstat(fd, &st);
1926         if (ret == -1)
1927                 return;
1928
1929         fprintf(fp, "# ========\n");
1930         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1931         perf_header__fprintf_info(session, fp, full);
1932         fprintf(fp, "# ========\n#\n");
1933 }
1934
1935
1936 int __perf_session__set_tracepoints_handlers(struct perf_session *session,
1937                                              const struct perf_evsel_str_handler *assocs,
1938                                              size_t nr_assocs)
1939 {
1940         struct perf_evsel *evsel;
1941         size_t i;
1942         int err;
1943
1944         for (i = 0; i < nr_assocs; i++) {
1945                 /*
1946                  * Adding a handler for an event not in the session,
1947                  * just ignore it.
1948                  */
1949                 evsel = perf_evlist__find_tracepoint_by_name(session->evlist, assocs[i].name);
1950                 if (evsel == NULL)
1951                         continue;
1952
1953                 err = -EEXIST;
1954                 if (evsel->handler != NULL)
1955                         goto out;
1956                 evsel->handler = assocs[i].handler;
1957         }
1958
1959         err = 0;
1960 out:
1961         return err;
1962 }
1963
1964 int perf_event__process_id_index(struct perf_tool *tool __maybe_unused,
1965                                  union perf_event *event,
1966                                  struct perf_session *session)
1967 {
1968         struct perf_evlist *evlist = session->evlist;
1969         struct id_index_event *ie = &event->id_index;
1970         size_t i, nr, max_nr;
1971
1972         max_nr = (ie->header.size - sizeof(struct id_index_event)) /
1973                  sizeof(struct id_index_entry);
1974         nr = ie->nr;
1975         if (nr > max_nr)
1976                 return -EINVAL;
1977
1978         if (dump_trace)
1979                 fprintf(stdout, " nr: %zu\n", nr);
1980
1981         for (i = 0; i < nr; i++) {
1982                 struct id_index_entry *e = &ie->entries[i];
1983                 struct perf_sample_id *sid;
1984
1985                 if (dump_trace) {
1986                         fprintf(stdout, " ... id: %"PRIu64, e->id);
1987                         fprintf(stdout, "  idx: %"PRIu64, e->idx);
1988                         fprintf(stdout, "  cpu: %"PRId64, e->cpu);
1989                         fprintf(stdout, "  tid: %"PRId64"\n", e->tid);
1990                 }
1991
1992                 sid = perf_evlist__id2sid(evlist, e->id);
1993                 if (!sid)
1994                         return -ENOENT;
1995                 sid->idx = e->idx;
1996                 sid->cpu = e->cpu;
1997                 sid->tid = e->tid;
1998         }
1999         return 0;
2000 }
2001
2002 int perf_event__synthesize_id_index(struct perf_tool *tool,
2003                                     perf_event__handler_t process,
2004                                     struct perf_evlist *evlist,
2005                                     struct machine *machine)
2006 {
2007         union perf_event *ev;
2008         struct perf_evsel *evsel;
2009         size_t nr = 0, i = 0, sz, max_nr, n;
2010         int err;
2011
2012         pr_debug2("Synthesizing id index\n");
2013
2014         max_nr = (UINT16_MAX - sizeof(struct id_index_event)) /
2015                  sizeof(struct id_index_entry);
2016
2017         evlist__for_each(evlist, evsel)
2018                 nr += evsel->ids;
2019
2020         n = nr > max_nr ? max_nr : nr;
2021         sz = sizeof(struct id_index_event) + n * sizeof(struct id_index_entry);
2022         ev = zalloc(sz);
2023         if (!ev)
2024                 return -ENOMEM;
2025
2026         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
2027         ev->id_index.header.size = sz;
2028         ev->id_index.nr = n;
2029
2030         evlist__for_each(evlist, evsel) {
2031                 u32 j;
2032
2033                 for (j = 0; j < evsel->ids; j++) {
2034                         struct id_index_entry *e;
2035                         struct perf_sample_id *sid;
2036
2037                         if (i >= n) {
2038                                 err = process(tool, ev, NULL, machine);
2039                                 if (err)
2040                                         goto out_err;
2041                                 nr -= n;
2042                                 i = 0;
2043                         }
2044
2045                         e = &ev->id_index.entries[i++];
2046
2047                         e->id = evsel->id[j];
2048
2049                         sid = perf_evlist__id2sid(evlist, e->id);
2050                         if (!sid) {
2051                                 free(ev);
2052                                 return -ENOENT;
2053                         }
2054
2055                         e->idx = sid->idx;
2056                         e->cpu = sid->cpu;
2057                         e->tid = sid->tid;
2058                 }
2059         }
2060
2061         sz = sizeof(struct id_index_event) + nr * sizeof(struct id_index_entry);
2062         ev->id_index.header.size = sz;
2063         ev->id_index.nr = nr;
2064
2065         err = process(tool, ev, NULL, machine);
2066 out_err:
2067         free(ev);
2068
2069         return err;
2070 }