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)\n");
  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\n");
  41                 return -1;
  42         }
  43
  44         if (!perf_evlist__valid_sample_id_all(session->evlist)) {
  45                 pr_err("non matching sample_id_all\n");
  46                 return -1;
  47         }
  48
  49         if (!perf_evlist__valid_read_format(session->evlist)) {
  50                 pr_err("non matching read_format\n");
  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         } else  {
 142                 session->machines.host.env = &perf_env;
 143         }
 144
 145         if (!file || perf_data_file__is_write(file)) {
 146                 /*
 147                  * In O_RDONLY mode this will be performed when reading the
 148                  * kernel MMAP event, in perf_event__process_mmap().
 149                  */
 150                 if (perf_session__create_kernel_maps(session) < 0)
 151                         pr_warning("Cannot read kernel map\n");
 152         }
 153
 154         if (tool && tool->ordering_requires_timestamps &&
 155             tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
 156                 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
 157                 tool->ordered_events = false;
 158         }
 159
 160         return session;
 161
 162  out_close:
 163         perf_data_file__close(file);
 164  out_delete:
 165         perf_session__delete(session);
 166  out:
 167         return NULL;
 168 }
 169
 170 static void perf_session__delete_threads(struct perf_session *session)
 171 {
 172         machine__delete_threads(&session->machines.host);
 173 }
 174
 175 void perf_session__delete(struct perf_session *session)
 176 {
 177         auxtrace__free(session);
 178         auxtrace_index__free(&session->auxtrace_index);
 179         perf_session__destroy_kernel_maps(session);
 180         perf_session__delete_threads(session);
 181         perf_env__exit(&session->header.env);
 182         machines__exit(&session->machines);
 183         if (session->file)
 184                 perf_data_file__close(session->file);
 185         free(session);
 186 }
 187
 188 static int process_event_synth_tracing_data_stub(struct perf_tool *tool
 189                                                  __maybe_unused,
 190                                                  union perf_event *event
 191                                                  __maybe_unused,
 192                                                  struct perf_session *session
 193                                                 __maybe_unused)
 194 {
 195         dump_printf(": unhandled!\n");
 196         return 0;
 197 }
 198
 199 static int process_event_synth_attr_stub(struct perf_tool *tool __maybe_unused,
 200                                          union perf_event *event __maybe_unused,
 201                                          struct perf_evlist **pevlist
 202                                          __maybe_unused)
 203 {
 204         dump_printf(": unhandled!\n");
 205         return 0;
 206 }
 207
 208 static int process_event_sample_stub(struct perf_tool *tool __maybe_unused,
 209                                      union perf_event *event __maybe_unused,
 210                                      struct perf_sample *sample __maybe_unused,
 211                                      struct perf_evsel *evsel __maybe_unused,
 212                                      struct machine *machine __maybe_unused)
 213 {
 214         dump_printf(": unhandled!\n");
 215         return 0;
 216 }
 217
 218 static int process_event_stub(struct perf_tool *tool __maybe_unused,
 219                               union perf_event *event __maybe_unused,
 220                               struct perf_sample *sample __maybe_unused,
 221                               struct machine *machine __maybe_unused)
 222 {
 223         dump_printf(": unhandled!\n");
 224         return 0;
 225 }
 226
 227 static int process_finished_round_stub(struct perf_tool *tool __maybe_unused,
 228                                        union perf_event *event __maybe_unused,
 229                                        struct ordered_events *oe __maybe_unused)
 230 {
 231         dump_printf(": unhandled!\n");
 232         return 0;
 233 }
 234
 235 static int process_finished_round(struct perf_tool *tool,
 236                                   union perf_event *event,
 237                                   struct ordered_events *oe);
 238
 239 static int skipn(int fd, off_t n)
 240 {
 241         char buf[4096];
 242         ssize_t ret;
 243
 244         while (n > 0) {
 245                 ret = read(fd, buf, min(n, (off_t)sizeof(buf)));
 246                 if (ret <= 0)
 247                         return ret;
 248                 n -= ret;
 249         }
 250
 251         return 0;
 252 }
 253
 254 static s64 process_event_auxtrace_stub(struct perf_tool *tool __maybe_unused,
 255                                        union perf_event *event,
 256                                        struct perf_session *session
 257                                        __maybe_unused)
 258 {
 259         dump_printf(": unhandled!\n");
 260         if (perf_data_file__is_pipe(session->file))
 261                 skipn(perf_data_file__fd(session->file), event->auxtrace.size);
 262         return event->auxtrace.size;
 263 }
 264
 265 static int process_event_op2_stub(struct perf_tool *tool __maybe_unused,
 266                                   union perf_event *event __maybe_unused,
 267                                   struct perf_session *session __maybe_unused)
 268 {
 269         dump_printf(": unhandled!\n");
 270         return 0;
 271 }
 272
 273 void perf_tool__fill_defaults(struct perf_tool *tool)
 274 {
 275         if (tool->sample == NULL)
 276                 tool->sample = process_event_sample_stub;
 277         if (tool->mmap == NULL)
 278                 tool->mmap = process_event_stub;
 279         if (tool->mmap2 == NULL)
 280                 tool->mmap2 = process_event_stub;
 281         if (tool->comm == NULL)
 282                 tool->comm = process_event_stub;
 283         if (tool->fork == NULL)
 284                 tool->fork = process_event_stub;
 285         if (tool->exit == NULL)
 286                 tool->exit = process_event_stub;
 287         if (tool->lost == NULL)
 288                 tool->lost = perf_event__process_lost;
 289         if (tool->lost_samples == NULL)
 290                 tool->lost_samples = perf_event__process_lost_samples;
 291         if (tool->aux == NULL)
 292                 tool->aux = perf_event__process_aux;
 293         if (tool->itrace_start == NULL)
 294                 tool->itrace_start = perf_event__process_itrace_start;
 295         if (tool->context_switch == NULL)
 296                 tool->context_switch = perf_event__process_switch;
 297         if (tool->read == NULL)
 298                 tool->read = process_event_sample_stub;
 299         if (tool->throttle == NULL)
 300                 tool->throttle = process_event_stub;
 301         if (tool->unthrottle == NULL)
 302                 tool->unthrottle = process_event_stub;
 303         if (tool->attr == NULL)
 304                 tool->attr = process_event_synth_attr_stub;
 305         if (tool->tracing_data == NULL)
 306                 tool->tracing_data = process_event_synth_tracing_data_stub;
 307         if (tool->build_id == NULL)
 308                 tool->build_id = process_event_op2_stub;
 309         if (tool->finished_round == NULL) {
 310                 if (tool->ordered_events)
 311                         tool->finished_round = process_finished_round;
 312                 else
 313                         tool->finished_round = process_finished_round_stub;
 314         }
 315         if (tool->id_index == NULL)
 316                 tool->id_index = process_event_op2_stub;
 317         if (tool->auxtrace_info == NULL)
 318                 tool->auxtrace_info = process_event_op2_stub;
 319         if (tool->auxtrace == NULL)
 320                 tool->auxtrace = process_event_auxtrace_stub;
 321         if (tool->auxtrace_error == NULL)
 322                 tool->auxtrace_error = process_event_op2_stub;
 323 }
 324
 325 static void swap_sample_id_all(union perf_event *event, void *data)
 326 {
 327         void *end = (void *) event + event->header.size;
 328         int size = end - data;
 329
 330         BUG_ON(size % sizeof(u64));
 331         mem_bswap_64(data, size);
 332 }
 333
 334 static void perf_event__all64_swap(union perf_event *event,
 335                                    bool sample_id_all __maybe_unused)
 336 {
 337         struct perf_event_header *hdr = &event->header;
 338         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 339 }
 340
 341 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
 342 {
 343         event->comm.pid = bswap_32(event->comm.pid);
 344         event->comm.tid = bswap_32(event->comm.tid);
 345
 346         if (sample_id_all) {
 347                 void *data = &event->comm.comm;
 348
 349                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
 350                 swap_sample_id_all(event, data);
 351         }
 352 }
 353
 354 static void perf_event__mmap_swap(union perf_event *event,
 355                                   bool sample_id_all)
 356 {
 357         event->mmap.pid   = bswap_32(event->mmap.pid);
 358         event->mmap.tid   = bswap_32(event->mmap.tid);
 359         event->mmap.start = bswap_64(event->mmap.start);
 360         event->mmap.len   = bswap_64(event->mmap.len);
 361         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 362
 363         if (sample_id_all) {
 364                 void *data = &event->mmap.filename;
 365
 366                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
 367                 swap_sample_id_all(event, data);
 368         }
 369 }
 370
 371 static void perf_event__mmap2_swap(union perf_event *event,
 372                                   bool sample_id_all)
 373 {
 374         event->mmap2.pid   = bswap_32(event->mmap2.pid);
 375         event->mmap2.tid   = bswap_32(event->mmap2.tid);
 376         event->mmap2.start = bswap_64(event->mmap2.start);
 377         event->mmap2.len   = bswap_64(event->mmap2.len);
 378         event->mmap2.pgoff = bswap_64(event->mmap2.pgoff);
 379         event->mmap2.maj   = bswap_32(event->mmap2.maj);
 380         event->mmap2.min   = bswap_32(event->mmap2.min);
 381         event->mmap2.ino   = bswap_64(event->mmap2.ino);
 382
 383         if (sample_id_all) {
 384                 void *data = &event->mmap2.filename;
 385
 386                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
 387                 swap_sample_id_all(event, data);
 388         }
 389 }
 390 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 391 {
 392         event->fork.pid  = bswap_32(event->fork.pid);
 393         event->fork.tid  = bswap_32(event->fork.tid);
 394         event->fork.ppid = bswap_32(event->fork.ppid);
 395         event->fork.ptid = bswap_32(event->fork.ptid);
 396         event->fork.time = bswap_64(event->fork.time);
 397
 398         if (sample_id_all)
 399                 swap_sample_id_all(event, &event->fork + 1);
 400 }
 401
 402 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 403 {
 404         event->read.pid          = bswap_32(event->read.pid);
 405         event->read.tid          = bswap_32(event->read.tid);
 406         event->read.value        = bswap_64(event->read.value);
 407         event->read.time_enabled = bswap_64(event->read.time_enabled);
 408         event->read.time_running = bswap_64(event->read.time_running);
 409         event->read.id           = bswap_64(event->read.id);
 410
 411         if (sample_id_all)
 412                 swap_sample_id_all(event, &event->read + 1);
 413 }
 414
 415 static void perf_event__aux_swap(union perf_event *event, bool sample_id_all)
 416 {
 417         event->aux.aux_offset = bswap_64(event->aux.aux_offset);
 418         event->aux.aux_size   = bswap_64(event->aux.aux_size);
 419         event->aux.flags      = bswap_64(event->aux.flags);
 420
 421         if (sample_id_all)
 422                 swap_sample_id_all(event, &event->aux + 1);
 423 }
 424
 425 static void perf_event__itrace_start_swap(union perf_event *event,
 426                                           bool sample_id_all)
 427 {
 428         event->itrace_start.pid  = bswap_32(event->itrace_start.pid);
 429         event->itrace_start.tid  = bswap_32(event->itrace_start.tid);
 430
 431         if (sample_id_all)
 432                 swap_sample_id_all(event, &event->itrace_start + 1);
 433 }
 434
 435 static void perf_event__switch_swap(union perf_event *event, bool sample_id_all)
 436 {
 437         if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) {
 438                 event->context_switch.next_prev_pid =
 439                                 bswap_32(event->context_switch.next_prev_pid);
 440                 event->context_switch.next_prev_tid =
 441                                 bswap_32(event->context_switch.next_prev_tid);
 442         }
 443
 444         if (sample_id_all)
 445                 swap_sample_id_all(event, &event->context_switch + 1);
 446 }
 447
 448 static void perf_event__throttle_swap(union perf_event *event,
 449                                       bool sample_id_all)
 450 {
 451         event->throttle.time      = bswap_64(event->throttle.time);
 452         event->throttle.id        = bswap_64(event->throttle.id);
 453         event->throttle.stream_id = bswap_64(event->throttle.stream_id);
 454
 455         if (sample_id_all)
 456                 swap_sample_id_all(event, &event->throttle + 1);
 457 }
 458
 459 static u8 revbyte(u8 b)
 460 {
 461         int rev = (b >> 4) | ((b & 0xf) << 4);
 462         rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
 463         rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
 464         return (u8) rev;
 465 }
 466
 467 /*
 468  * XXX this is hack in attempt to carry flags bitfield
 469  * throught endian village. ABI says:
 470  *
 471  * Bit-fields are allocated from right to left (least to most significant)
 472  * on little-endian implementations and from left to right (most to least
 473  * significant) on big-endian implementations.
 474  *
 475  * The above seems to be byte specific, so we need to reverse each
 476  * byte of the bitfield. 'Internet' also says this might be implementation
 477  * specific and we probably need proper fix and carry perf_event_attr
 478  * bitfield flags in separate data file FEAT_ section. Thought this seems
 479  * to work for now.
 480  */
 481 static void swap_bitfield(u8 *p, unsigned len)
 482 {
 483         unsigned i;
 484
 485         for (i = 0; i < len; i++) {
 486                 *p = revbyte(*p);
 487                 p++;
 488         }
 489 }
 490
 491 /* exported for swapping attributes in file header */
 492 void perf_event__attr_swap(struct perf_event_attr *attr)
 493 {
 494         attr->type              = bswap_32(attr->type);
 495         attr->size              = bswap_32(attr->size);
 496
 497 #define bswap_safe(f, n)                                        \
 498         (attr->size > (offsetof(struct perf_event_attr, f) +    \
 499                        sizeof(attr->f) * (n)))
 500 #define bswap_field(f, sz)                      \
 501 do {                                            \
 502         if (bswap_safe(f, 0))                   \
 503                 attr->f = bswap_##sz(attr->f);  \
 504 } while(0)
 505 #define bswap_field_32(f) bswap_field(f, 32)
 506 #define bswap_field_64(f) bswap_field(f, 64)
 507
 508         bswap_field_64(config);
 509         bswap_field_64(sample_period);
 510         bswap_field_64(sample_type);
 511         bswap_field_64(read_format);
 512         bswap_field_32(wakeup_events);
 513         bswap_field_32(bp_type);
 514         bswap_field_64(bp_addr);
 515         bswap_field_64(bp_len);
 516         bswap_field_64(branch_sample_type);
 517         bswap_field_64(sample_regs_user);
 518         bswap_field_32(sample_stack_user);
 519         bswap_field_32(aux_watermark);
 520
 521         /*
 522          * After read_format are bitfields. Check read_format because
 523          * we are unable to use offsetof on bitfield.
 524          */
 525         if (bswap_safe(read_format, 1))
 526                 swap_bitfield((u8 *) (&attr->read_format + 1),
 527                               sizeof(u64));
 528 #undef bswap_field_64
 529 #undef bswap_field_32
 530 #undef bswap_field
 531 #undef bswap_safe
 532 }
 533
 534 static void perf_event__hdr_attr_swap(union perf_event *event,
 535                                       bool sample_id_all __maybe_unused)
 536 {
 537         size_t size;
 538
 539         perf_event__attr_swap(&event->attr.attr);
 540
 541         size = event->header.size;
 542         size -= (void *)&event->attr.id - (void *)event;
 543         mem_bswap_64(event->attr.id, size);
 544 }
 545
 546 static void perf_event__event_type_swap(union perf_event *event,
 547                                         bool sample_id_all __maybe_unused)
 548 {
 549         event->event_type.event_type.event_id =
 550                 bswap_64(event->event_type.event_type.event_id);
 551 }
 552
 553 static void perf_event__tracing_data_swap(union perf_event *event,
 554                                           bool sample_id_all __maybe_unused)
 555 {
 556         event->tracing_data.size = bswap_32(event->tracing_data.size);
 557 }
 558
 559 static void perf_event__auxtrace_info_swap(union perf_event *event,
 560                                            bool sample_id_all __maybe_unused)
 561 {
 562         size_t size;
 563
 564         event->auxtrace_info.type = bswap_32(event->auxtrace_info.type);
 565
 566         size = event->header.size;
 567         size -= (void *)&event->auxtrace_info.priv - (void *)event;
 568         mem_bswap_64(event->auxtrace_info.priv, size);
 569 }
 570
 571 static void perf_event__auxtrace_swap(union perf_event *event,
 572                                       bool sample_id_all __maybe_unused)
 573 {
 574         event->auxtrace.size      = bswap_64(event->auxtrace.size);
 575         event->auxtrace.offset    = bswap_64(event->auxtrace.offset);
 576         event->auxtrace.reference = bswap_64(event->auxtrace.reference);
 577         event->auxtrace.idx       = bswap_32(event->auxtrace.idx);
 578         event->auxtrace.tid       = bswap_32(event->auxtrace.tid);
 579         event->auxtrace.cpu       = bswap_32(event->auxtrace.cpu);
 580 }
 581
 582 static void perf_event__auxtrace_error_swap(union perf_event *event,
 583                                             bool sample_id_all __maybe_unused)
 584 {
 585         event->auxtrace_error.type = bswap_32(event->auxtrace_error.type);
 586         event->auxtrace_error.code = bswap_32(event->auxtrace_error.code);
 587         event->auxtrace_error.cpu  = bswap_32(event->auxtrace_error.cpu);
 588         event->auxtrace_error.pid  = bswap_32(event->auxtrace_error.pid);
 589         event->auxtrace_error.tid  = bswap_32(event->auxtrace_error.tid);
 590         event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
 591 }
 592
 593 typedef void (*perf_event__swap_op)(union perf_event *event,
 594                                     bool sample_id_all);
 595
 596 static perf_event__swap_op perf_event__swap_ops[] = {
 597         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 598         [PERF_RECORD_MMAP2]               = perf_event__mmap2_swap,
 599         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 600         [PERF_RECORD_FORK]                = perf_event__task_swap,
 601         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 602         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 603         [PERF_RECORD_READ]                = perf_event__read_swap,
 604         [PERF_RECORD_THROTTLE]            = perf_event__throttle_swap,
 605         [PERF_RECORD_UNTHROTTLE]          = perf_event__throttle_swap,
 606         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 607         [PERF_RECORD_AUX]                 = perf_event__aux_swap,
 608         [PERF_RECORD_ITRACE_START]        = perf_event__itrace_start_swap,
 609         [PERF_RECORD_LOST_SAMPLES]        = perf_event__all64_swap,
 610         [PERF_RECORD_SWITCH]              = perf_event__switch_swap,
 611         [PERF_RECORD_SWITCH_CPU_WIDE]     = perf_event__switch_swap,
 612         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 613         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 614         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 615         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 616         [PERF_RECORD_ID_INDEX]            = perf_event__all64_swap,
 617         [PERF_RECORD_AUXTRACE_INFO]       = perf_event__auxtrace_info_swap,
 618         [PERF_RECORD_AUXTRACE]            = perf_event__auxtrace_swap,
 619         [PERF_RECORD_AUXTRACE_ERROR]      = perf_event__auxtrace_error_swap,
 620         [PERF_RECORD_HEADER_MAX]          = NULL,
 621 };
 622
 623 /*
 624  * When perf record finishes a pass on every buffers, it records this pseudo
 625  * event.
 626  * We record the max timestamp t found in the pass n.
 627  * Assuming these timestamps are monotonic across cpus, we know that if
 628  * a buffer still has events with timestamps below t, they will be all
 629  * available and then read in the pass n + 1.
 630  * Hence when we start to read the pass n + 2, we can safely flush every
 631  * events with timestamps below t.
 632  *
 633  *    ============ PASS n =================
 634  *       CPU 0         |   CPU 1
 635  *                     |
 636  *    cnt1 timestamps  |   cnt2 timestamps
 637  *          1          |         2
 638  *          2          |         3
 639  *          -          |         4  <--- max recorded
 640  *
 641  *    ============ PASS n + 1 ==============
 642  *       CPU 0         |   CPU 1
 643  *                     |
 644  *    cnt1 timestamps  |   cnt2 timestamps
 645  *          3          |         5
 646  *          4          |         6
 647  *          5          |         7 <---- max recorded
 648  *
 649  *      Flush every events below timestamp 4
 650  *
 651  *    ============ PASS n + 2 ==============
 652  *       CPU 0         |   CPU 1
 653  *                     |
 654  *    cnt1 timestamps  |   cnt2 timestamps
 655  *          6          |         8
 656  *          7          |         9
 657  *          -          |         10
 658  *
 659  *      Flush every events below timestamp 7
 660  *      etc...
 661  */
 662 static int process_finished_round(struct perf_tool *tool __maybe_unused,
 663                                   union perf_event *event __maybe_unused,
 664                                   struct ordered_events *oe)
 665 {
 666         if (dump_trace)
 667                 fprintf(stdout, "\n");
 668         return ordered_events__flush(oe, OE_FLUSH__ROUND);
 669 }
 670
 671 int perf_session__queue_event(struct perf_session *s, union perf_event *event,
 672                               struct perf_sample *sample, u64 file_offset)
 673 {
 674         return ordered_events__queue(&s->ordered_events, event, sample, file_offset);
 675 }
 676
 677 static void callchain__lbr_callstack_printf(struct perf_sample *sample)
 678 {
 679         struct ip_callchain *callchain = sample->callchain;
 680         struct branch_stack *lbr_stack = sample->branch_stack;
 681         u64 kernel_callchain_nr = callchain->nr;
 682         unsigned int i;
 683
 684         for (i = 0; i < kernel_callchain_nr; i++) {
 685                 if (callchain->ips[i] == PERF_CONTEXT_USER)
 686                         break;
 687         }
 688
 689         if ((i != kernel_callchain_nr) && lbr_stack->nr) {
 690                 u64 total_nr;
 691                 /*
 692                  * LBR callstack can only get user call chain,
 693                  * i is kernel call chain number,
 694                  * 1 is PERF_CONTEXT_USER.
 695                  *
 696                  * The user call chain is stored in LBR registers.
 697                  * LBR are pair registers. The caller is stored
 698                  * in "from" register, while the callee is stored
 699                  * in "to" register.
 700                  * For example, there is a call stack
 701                  * "A"->"B"->"C"->"D".
 702                  * The LBR registers will recorde like
 703                  * "C"->"D", "B"->"C", "A"->"B".
 704                  * So only the first "to" register and all "from"
 705                  * registers are needed to construct the whole stack.
 706                  */
 707                 total_nr = i + 1 + lbr_stack->nr + 1;
 708                 kernel_callchain_nr = i + 1;
 709
 710                 printf("... LBR call chain: nr:%" PRIu64 "\n", total_nr);
 711
 712                 for (i = 0; i < kernel_callchain_nr; i++)
 713                         printf("..... %2d: %016" PRIx64 "\n",
 714                                i, callchain->ips[i]);
 715
 716                 printf("..... %2d: %016" PRIx64 "\n",
 717                        (int)(kernel_callchain_nr), lbr_stack->entries[0].to);
 718                 for (i = 0; i < lbr_stack->nr; i++)
 719                         printf("..... %2d: %016" PRIx64 "\n",
 720                                (int)(i + kernel_callchain_nr + 1), lbr_stack->entries[i].from);
 721         }
 722 }
 723
 724 static void callchain__printf(struct perf_evsel *evsel,
 725                               struct perf_sample *sample)
 726 {
 727         unsigned int i;
 728         struct ip_callchain *callchain = sample->callchain;
 729
 730         if (has_branch_callstack(evsel))
 731                 callchain__lbr_callstack_printf(sample);
 732
 733         printf("... FP chain: nr:%" PRIu64 "\n", callchain->nr);
 734
 735         for (i = 0; i < callchain->nr; i++)
 736                 printf("..... %2d: %016" PRIx64 "\n",
 737                        i, callchain->ips[i]);
 738 }
 739
 740 static void branch_stack__printf(struct perf_sample *sample)
 741 {
 742         uint64_t i;
 743
 744         printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
 745
 746         for (i = 0; i < sample->branch_stack->nr; i++) {
 747                 struct branch_entry *e = &sample->branch_stack->entries[i];
 748
 749                 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 " %hu cycles %s%s%s%s %x\n",
 750                         i, e->from, e->to,
 751                         e->flags.cycles,
 752                         e->flags.mispred ? "M" : " ",
 753                         e->flags.predicted ? "P" : " ",
 754                         e->flags.abort ? "A" : " ",
 755                         e->flags.in_tx ? "T" : " ",
 756                         (unsigned)e->flags.reserved);
 757         }
 758 }
 759
 760 static void regs_dump__printf(u64 mask, u64 *regs)
 761 {
 762         unsigned rid, i = 0;
 763
 764         for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
 765                 u64 val = regs[i++];
 766
 767                 printf(".... %-5s 0x%" PRIx64 "\n",
 768                        perf_reg_name(rid), val);
 769         }
 770 }
 771
 772 static const char *regs_abi[] = {
 773         [PERF_SAMPLE_REGS_ABI_NONE] = "none",
 774         [PERF_SAMPLE_REGS_ABI_32] = "32-bit",
 775         [PERF_SAMPLE_REGS_ABI_64] = "64-bit",
 776 };
 777
 778 static inline const char *regs_dump_abi(struct regs_dump *d)
 779 {
 780         if (d->abi > PERF_SAMPLE_REGS_ABI_64)
 781                 return "unknown";
 782
 783         return regs_abi[d->abi];
 784 }
 785
 786 static void regs__printf(const char *type, struct regs_dump *regs)
 787 {
 788         u64 mask = regs->mask;
 789
 790         printf("... %s regs: mask 0x%" PRIx64 " ABI %s\n",
 791                type,
 792                mask,
 793                regs_dump_abi(regs));
 794
 795         regs_dump__printf(mask, regs->regs);
 796 }
 797
 798 static void regs_user__printf(struct perf_sample *sample)
 799 {
 800         struct regs_dump *user_regs = &sample->user_regs;
 801
 802         if (user_regs->regs)
 803                 regs__printf("user", user_regs);
 804 }
 805
 806 static void regs_intr__printf(struct perf_sample *sample)
 807 {
 808         struct regs_dump *intr_regs = &sample->intr_regs;
 809
 810         if (intr_regs->regs)
 811                 regs__printf("intr", intr_regs);
 812 }
 813
 814 static void stack_user__printf(struct stack_dump *dump)
 815 {
 816         printf("... ustack: size %" PRIu64 ", offset 0x%x\n",
 817                dump->size, dump->offset);
 818 }
 819
 820 static void perf_evlist__print_tstamp(struct perf_evlist *evlist,
 821                                        union perf_event *event,
 822                                        struct perf_sample *sample)
 823 {
 824         u64 sample_type = __perf_evlist__combined_sample_type(evlist);
 825
 826         if (event->header.type != PERF_RECORD_SAMPLE &&
 827             !perf_evlist__sample_id_all(evlist)) {
 828                 fputs("-1 -1 ", stdout);
 829                 return;
 830         }
 831
 832         if ((sample_type & PERF_SAMPLE_CPU))
 833                 printf("%u ", sample->cpu);
 834
 835         if (sample_type & PERF_SAMPLE_TIME)
 836                 printf("%" PRIu64 " ", sample->time);
 837 }
 838
 839 static void sample_read__printf(struct perf_sample *sample, u64 read_format)
 840 {
 841         printf("... sample_read:\n");
 842
 843         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 844                 printf("...... time enabled %016" PRIx64 "\n",
 845                        sample->read.time_enabled);
 846
 847         if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 848                 printf("...... time running %016" PRIx64 "\n",
 849                        sample->read.time_running);
 850
 851         if (read_format & PERF_FORMAT_GROUP) {
 852                 u64 i;
 853
 854                 printf(".... group nr %" PRIu64 "\n", sample->read.group.nr);
 855
 856                 for (i = 0; i < sample->read.group.nr; i++) {
 857                         struct sample_read_value *value;
 858
 859                         value = &sample->read.group.values[i];
 860                         printf("..... id %016" PRIx64
 861                                ", value %016" PRIx64 "\n",
 862                                value->id, value->value);
 863                 }
 864         } else
 865                 printf("..... id %016" PRIx64 ", value %016" PRIx64 "\n",
 866                         sample->read.one.id, sample->read.one.value);
 867 }
 868
 869 static void dump_event(struct perf_evlist *evlist, union perf_event *event,
 870                        u64 file_offset, struct perf_sample *sample)
 871 {
 872         if (!dump_trace)
 873                 return;
 874
 875         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 876                file_offset, event->header.size, event->header.type);
 877
 878         trace_event(event);
 879
 880         if (sample)
 881                 perf_evlist__print_tstamp(evlist, event, sample);
 882
 883         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 884                event->header.size, perf_event__name(event->header.type));
 885 }
 886
 887 static void dump_sample(struct perf_evsel *evsel, union perf_event *event,
 888                         struct perf_sample *sample)
 889 {
 890         u64 sample_type;
 891
 892         if (!dump_trace)
 893                 return;
 894
 895         printf("(IP, 0x%x): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 896                event->header.misc, sample->pid, sample->tid, sample->ip,
 897                sample->period, sample->addr);
 898
 899         sample_type = evsel->attr.sample_type;
 900
 901         if (sample_type & PERF_SAMPLE_CALLCHAIN)
 902                 callchain__printf(evsel, sample);
 903
 904         if ((sample_type & PERF_SAMPLE_BRANCH_STACK) && !has_branch_callstack(evsel))
 905                 branch_stack__printf(sample);
 906
 907         if (sample_type & PERF_SAMPLE_REGS_USER)
 908                 regs_user__printf(sample);
 909
 910         if (sample_type & PERF_SAMPLE_REGS_INTR)
 911                 regs_intr__printf(sample);
 912
 913         if (sample_type & PERF_SAMPLE_STACK_USER)
 914                 stack_user__printf(&sample->user_stack);
 915
 916         if (sample_type & PERF_SAMPLE_WEIGHT)
 917                 printf("... weight: %" PRIu64 "\n", sample->weight);
 918
 919         if (sample_type & PERF_SAMPLE_DATA_SRC)
 920                 printf(" . data_src: 0x%"PRIx64"\n", sample->data_src);
 921
 922         if (sample_type & PERF_SAMPLE_TRANSACTION)
 923                 printf("... transaction: %" PRIx64 "\n", sample->transaction);
 924
 925         if (sample_type & PERF_SAMPLE_READ)
 926                 sample_read__printf(sample, evsel->attr.read_format);
 927 }
 928
 929 static struct machine *machines__find_for_cpumode(struct machines *machines,
 930                                                union perf_event *event,
 931                                                struct perf_sample *sample)
 932 {
 933         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 934         struct machine *machine;
 935
 936         if (perf_guest &&
 937             ((cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ||
 938              (cpumode == PERF_RECORD_MISC_GUEST_USER))) {
 939                 u32 pid;
 940
 941                 if (event->header.type == PERF_RECORD_MMAP
 942                     || event->header.type == PERF_RECORD_MMAP2)
 943                         pid = event->mmap.pid;
 944                 else
 945                         pid = sample->pid;
 946
 947                 machine = machines__find(machines, pid);
 948                 if (!machine)
 949                         machine = machines__findnew(machines, DEFAULT_GUEST_KERNEL_ID);
 950                 return machine;
 951         }
 952
 953         return &machines->host;
 954 }
 955
 956 static int deliver_sample_value(struct perf_evlist *evlist,
 957                                 struct perf_tool *tool,
 958                                 union perf_event *event,
 959                                 struct perf_sample *sample,
 960                                 struct sample_read_value *v,
 961                                 struct machine *machine)
 962 {
 963         struct perf_sample_id *sid = perf_evlist__id2sid(evlist, v->id);
 964
 965         if (sid) {
 966                 sample->id     = v->id;
 967                 sample->period = v->value - sid->period;
 968                 sid->period    = v->value;
 969         }
 970
 971         if (!sid || sid->evsel == NULL) {
 972                 ++evlist->stats.nr_unknown_id;
 973                 return 0;
 974         }
 975
 976         return tool->sample(tool, event, sample, sid->evsel, machine);
 977 }
 978
 979 static int deliver_sample_group(struct perf_evlist *evlist,
 980                                 struct perf_tool *tool,
 981                                 union  perf_event *event,
 982                                 struct perf_sample *sample,
 983                                 struct machine *machine)
 984 {
 985         int ret = -EINVAL;
 986         u64 i;
 987
 988         for (i = 0; i < sample->read.group.nr; i++) {
 989                 ret = deliver_sample_value(evlist, tool, event, sample,
 990                                            &sample->read.group.values[i],
 991                                            machine);
 992                 if (ret)
 993                         break;
 994         }
 995
 996         return ret;
 997 }
 998
 999 static int
1000  perf_evlist__deliver_sample(struct perf_evlist *evlist,
1001                              struct perf_tool *tool,
1002                              union  perf_event *event,
1003                              struct perf_sample *sample,
1004                              struct perf_evsel *evsel,
1005                              struct machine *machine)
1006 {
1007         /* We know evsel != NULL. */
1008         u64 sample_type = evsel->attr.sample_type;
1009         u64 read_format = evsel->attr.read_format;
1010
1011         /* Standard sample delievery. */
1012         if (!(sample_type & PERF_SAMPLE_READ))
1013                 return tool->sample(tool, event, sample, evsel, machine);
1014
1015         /* For PERF_SAMPLE_READ we have either single or group mode. */
1016         if (read_format & PERF_FORMAT_GROUP)
1017                 return deliver_sample_group(evlist, tool, event, sample,
1018                                             machine);
1019         else
1020                 return deliver_sample_value(evlist, tool, event, sample,
1021                                             &sample->read.one, machine);
1022 }
1023
1024 static int machines__deliver_event(struct machines *machines,
1025                                    struct perf_evlist *evlist,
1026                                    union perf_event *event,
1027                                    struct perf_sample *sample,
1028                                    struct perf_tool *tool, u64 file_offset)
1029 {
1030         struct perf_evsel *evsel;
1031         struct machine *machine;
1032
1033         dump_event(evlist, event, file_offset, sample);
1034
1035         evsel = perf_evlist__id2evsel(evlist, sample->id);
1036
1037         machine = machines__find_for_cpumode(machines, event, sample);
1038
1039         switch (event->header.type) {
1040         case PERF_RECORD_SAMPLE:
1041                 if (evsel == NULL) {
1042                         ++evlist->stats.nr_unknown_id;
1043                         return 0;
1044                 }
1045                 dump_sample(evsel, event, sample);
1046                 if (machine == NULL) {
1047                         ++evlist->stats.nr_unprocessable_samples;
1048                         return 0;
1049                 }
1050                 return perf_evlist__deliver_sample(evlist, tool, event, sample, evsel, machine);
1051         case PERF_RECORD_MMAP:
1052                 return tool->mmap(tool, event, sample, machine);
1053         case PERF_RECORD_MMAP2:
1054                 if (event->header.misc & PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT)
1055                         ++evlist->stats.nr_proc_map_timeout;
1056                 return tool->mmap2(tool, event, sample, machine);
1057         case PERF_RECORD_COMM:
1058                 return tool->comm(tool, event, sample, machine);
1059         case PERF_RECORD_FORK:
1060                 return tool->fork(tool, event, sample, machine);
1061         case PERF_RECORD_EXIT:
1062                 return tool->exit(tool, event, sample, machine);
1063         case PERF_RECORD_LOST:
1064                 if (tool->lost == perf_event__process_lost)
1065                         evlist->stats.total_lost += event->lost.lost;
1066                 return tool->lost(tool, event, sample, machine);
1067         case PERF_RECORD_LOST_SAMPLES:
1068                 if (tool->lost_samples == perf_event__process_lost_samples)
1069                         evlist->stats.total_lost_samples += event->lost_samples.lost;
1070                 return tool->lost_samples(tool, event, sample, machine);
1071         case PERF_RECORD_READ:
1072                 return tool->read(tool, event, sample, evsel, machine);
1073         case PERF_RECORD_THROTTLE:
1074                 return tool->throttle(tool, event, sample, machine);
1075         case PERF_RECORD_UNTHROTTLE:
1076                 return tool->unthrottle(tool, event, sample, machine);
1077         case PERF_RECORD_AUX:
1078                 if (tool->aux == perf_event__process_aux &&
1079                     (event->aux.flags & PERF_AUX_FLAG_TRUNCATED))
1080                         evlist->stats.total_aux_lost += 1;
1081                 return tool->aux(tool, event, sample, machine);
1082         case PERF_RECORD_ITRACE_START:
1083                 return tool->itrace_start(tool, event, sample, machine);
1084         case PERF_RECORD_SWITCH:
1085         case PERF_RECORD_SWITCH_CPU_WIDE:
1086                 return tool->context_switch(tool, event, sample, machine);
1087         default:
1088                 ++evlist->stats.nr_unknown_events;
1089                 return -1;
1090         }
1091 }
1092
1093 static int perf_session__deliver_event(struct perf_session *session,
1094                                        union perf_event *event,
1095                                        struct perf_sample *sample,
1096                                        struct perf_tool *tool,
1097                                        u64 file_offset)
1098 {
1099         int ret;
1100
1101         ret = auxtrace__process_event(session, event, sample, tool);
1102         if (ret < 0)
1103                 return ret;
1104         if (ret > 0)
1105                 return 0;
1106
1107         return machines__deliver_event(&session->machines, session->evlist,
1108                                        event, sample, tool, file_offset);
1109 }
1110
1111 static s64 perf_session__process_user_event(struct perf_session *session,
1112                                             union perf_event *event,
1113                                             u64 file_offset)
1114 {
1115         struct ordered_events *oe = &session->ordered_events;
1116         struct perf_tool *tool = session->tool;
1117         int fd = perf_data_file__fd(session->file);
1118         int err;
1119
1120         dump_event(session->evlist, event, file_offset, NULL);
1121
1122         /* These events are processed right away */
1123         switch (event->header.type) {
1124         case PERF_RECORD_HEADER_ATTR:
1125                 err = tool->attr(tool, event, &session->evlist);
1126                 if (err == 0) {
1127                         perf_session__set_id_hdr_size(session);
1128                         perf_session__set_comm_exec(session);
1129                 }
1130                 return err;
1131         case PERF_RECORD_HEADER_EVENT_TYPE:
1132                 /*
1133                  * Depreceated, but we need to handle it for sake
1134                  * of old data files create in pipe mode.
1135                  */
1136                 return 0;
1137         case PERF_RECORD_HEADER_TRACING_DATA:
1138                 /* setup for reading amidst mmap */
1139                 lseek(fd, file_offset, SEEK_SET);
1140                 return tool->tracing_data(tool, event, session);
1141         case PERF_RECORD_HEADER_BUILD_ID:
1142                 return tool->build_id(tool, event, session);
1143         case PERF_RECORD_FINISHED_ROUND:
1144                 return tool->finished_round(tool, event, oe);
1145         case PERF_RECORD_ID_INDEX:
1146                 return tool->id_index(tool, event, session);
1147         case PERF_RECORD_AUXTRACE_INFO:
1148                 return tool->auxtrace_info(tool, event, session);
1149         case PERF_RECORD_AUXTRACE:
1150                 /* setup for reading amidst mmap */
1151                 lseek(fd, file_offset + event->header.size, SEEK_SET);
1152                 return tool->auxtrace(tool, event, session);
1153         case PERF_RECORD_AUXTRACE_ERROR:
1154                 perf_session__auxtrace_error_inc(session, event);
1155                 return tool->auxtrace_error(tool, event, session);
1156         default:
1157                 return -EINVAL;
1158         }
1159 }
1160
1161 int perf_session__deliver_synth_event(struct perf_session *session,
1162                                       union perf_event *event,
1163                                       struct perf_sample *sample)
1164 {
1165         struct perf_evlist *evlist = session->evlist;
1166         struct perf_tool *tool = session->tool;
1167
1168         events_stats__inc(&evlist->stats, event->header.type);
1169
1170         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
1171                 return perf_session__process_user_event(session, event, 0);
1172
1173         return machines__deliver_event(&session->machines, evlist, event, sample, tool, 0);
1174 }
1175
1176 static void event_swap(union perf_event *event, bool sample_id_all)
1177 {
1178         perf_event__swap_op swap;
1179
1180         swap = perf_event__swap_ops[event->header.type];
1181         if (swap)
1182                 swap(event, sample_id_all);
1183 }
1184
1185 int perf_session__peek_event(struct perf_session *session, off_t file_offset,
1186                              void *buf, size_t buf_sz,
1187                              union perf_event **event_ptr,
1188                              struct perf_sample *sample)
1189 {
1190         union perf_event *event;
1191         size_t hdr_sz, rest;
1192         int fd;
1193
1194         if (session->one_mmap && !session->header.needs_swap) {
1195                 event = file_offset - session->one_mmap_offset +
1196                         session->one_mmap_addr;
1197                 goto out_parse_sample;
1198         }
1199
1200         if (perf_data_file__is_pipe(session->file))
1201                 return -1;
1202
1203         fd = perf_data_file__fd(session->file);
1204         hdr_sz = sizeof(struct perf_event_header);
1205
1206         if (buf_sz < hdr_sz)
1207                 return -1;
1208
1209         if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 ||
1210             readn(fd, buf, hdr_sz) != (ssize_t)hdr_sz)
1211                 return -1;
1212
1213         event = (union perf_event *)buf;
1214
1215         if (session->header.needs_swap)
1216                 perf_event_header__bswap(&event->header);
1217
1218         if (event->header.size < hdr_sz || event->header.size > buf_sz)
1219                 return -1;
1220
1221         rest = event->header.size - hdr_sz;
1222
1223         if (readn(fd, buf, rest) != (ssize_t)rest)
1224                 return -1;
1225
1226         if (session->header.needs_swap)
1227                 event_swap(event, perf_evlist__sample_id_all(session->evlist));
1228
1229 out_parse_sample:
1230
1231         if (sample && event->header.type < PERF_RECORD_USER_TYPE_START &&
1232             perf_evlist__parse_sample(session->evlist, event, sample))
1233                 return -1;
1234
1235         *event_ptr = event;
1236
1237         return 0;
1238 }
1239
1240 static s64 perf_session__process_event(struct perf_session *session,
1241                                        union perf_event *event, u64 file_offset)
1242 {
1243         struct perf_evlist *evlist = session->evlist;
1244         struct perf_tool *tool = session->tool;
1245         struct perf_sample sample;
1246         int ret;
1247
1248         if (session->header.needs_swap)
1249                 event_swap(event, perf_evlist__sample_id_all(evlist));
1250
1251         if (event->header.type >= PERF_RECORD_HEADER_MAX)
1252                 return -EINVAL;
1253
1254         events_stats__inc(&evlist->stats, event->header.type);
1255
1256         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
1257                 return perf_session__process_user_event(session, event, file_offset);
1258
1259         /*
1260          * For all kernel events we get the sample data
1261          */
1262         ret = perf_evlist__parse_sample(evlist, event, &sample);
1263         if (ret)
1264                 return ret;
1265
1266         if (tool->ordered_events) {
1267                 ret = perf_session__queue_event(session, event, &sample, file_offset);
1268                 if (ret != -ETIME)
1269                         return ret;
1270         }
1271
1272         return perf_session__deliver_event(session, event, &sample, tool,
1273                                            file_offset);
1274 }
1275
1276 void perf_event_header__bswap(struct perf_event_header *hdr)
1277 {
1278         hdr->type = bswap_32(hdr->type);
1279         hdr->misc = bswap_16(hdr->misc);
1280         hdr->size = bswap_16(hdr->size);
1281 }
1282
1283 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
1284 {
1285         return machine__findnew_thread(&session->machines.host, -1, pid);
1286 }
1287
1288 struct thread *perf_session__register_idle_thread(struct perf_session *session)
1289 {
1290         struct thread *thread;
1291
1292         thread = machine__findnew_thread(&session->machines.host, 0, 0);
1293         if (thread == NULL || thread__set_comm(thread, "swapper", 0)) {
1294                 pr_err("problem inserting idle task.\n");
1295                 thread = NULL;
1296         }
1297
1298         return thread;
1299 }
1300
1301 static void perf_session__warn_about_errors(const struct perf_session *session)
1302 {
1303         const struct events_stats *stats = &session->evlist->stats;
1304         const struct ordered_events *oe = &session->ordered_events;
1305
1306         if (session->tool->lost == perf_event__process_lost &&
1307             stats->nr_events[PERF_RECORD_LOST] != 0) {
1308                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1309                             "Check IO/CPU overload!\n\n",
1310                             stats->nr_events[0],
1311                             stats->nr_events[PERF_RECORD_LOST]);
1312         }
1313
1314         if (session->tool->lost_samples == perf_event__process_lost_samples) {
1315                 double drop_rate;
1316
1317                 drop_rate = (double)stats->total_lost_samples /
1318                             (double) (stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples);
1319                 if (drop_rate > 0.05) {
1320                         ui__warning("Processed %" PRIu64 " samples and lost %3.2f%% samples!\n\n",
1321                                     stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples,
1322                                     drop_rate * 100.0);
1323                 }
1324         }
1325
1326         if (session->tool->aux == perf_event__process_aux &&
1327             stats->total_aux_lost != 0) {
1328                 ui__warning("AUX data lost %" PRIu64 " times out of %u!\n\n",
1329                             stats->total_aux_lost,
1330                             stats->nr_events[PERF_RECORD_AUX]);
1331         }
1332
1333         if (stats->nr_unknown_events != 0) {
1334                 ui__warning("Found %u unknown events!\n\n"
1335                             "Is this an older tool processing a perf.data "
1336                             "file generated by a more recent tool?\n\n"
1337                             "If that is not the case, consider "
1338                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1339                             stats->nr_unknown_events);
1340         }
1341
1342         if (stats->nr_unknown_id != 0) {
1343                 ui__warning("%u samples with id not present in the header\n",
1344                             stats->nr_unknown_id);
1345         }
1346
1347         if (stats->nr_invalid_chains != 0) {
1348                 ui__warning("Found invalid callchains!\n\n"
1349                             "%u out of %u events were discarded for this reason.\n\n"
1350                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1351                             stats->nr_invalid_chains,
1352                             stats->nr_events[PERF_RECORD_SAMPLE]);
1353         }
1354
1355         if (stats->nr_unprocessable_samples != 0) {
1356                 ui__warning("%u unprocessable samples recorded.\n"
1357                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1358                             stats->nr_unprocessable_samples);
1359         }
1360
1361         if (oe->nr_unordered_events != 0)
1362                 ui__warning("%u out of order events recorded.\n", oe->nr_unordered_events);
1363
1364         events_stats__auxtrace_error_warn(stats);
1365
1366         if (stats->nr_proc_map_timeout != 0) {
1367                 ui__warning("%d map information files for pre-existing threads were\n"
1368                             "not processed, if there are samples for addresses they\n"
1369                             "will not be resolved, you may find out which are these\n"
1370                             "threads by running with -v and redirecting the output\n"
1371                             "to a file.\n"
1372                             "The time limit to process proc map is too short?\n"
1373                             "Increase it by --proc-map-timeout\n",
1374                             stats->nr_proc_map_timeout);
1375         }
1376 }
1377
1378 static int perf_session__flush_thread_stack(struct thread *thread,
1379                                             void *p __maybe_unused)
1380 {
1381         return thread_stack__flush(thread);
1382 }
1383
1384 static int perf_session__flush_thread_stacks(struct perf_session *session)
1385 {
1386         return machines__for_each_thread(&session->machines,
1387                                          perf_session__flush_thread_stack,
1388                                          NULL);
1389 }
1390
1391 volatile int session_done;
1392
1393 static int __perf_session__process_pipe_events(struct perf_session *session)
1394 {
1395         struct ordered_events *oe = &session->ordered_events;
1396         struct perf_tool *tool = session->tool;
1397         int fd = perf_data_file__fd(session->file);
1398         union perf_event *event;
1399         uint32_t size, cur_size = 0;
1400         void *buf = NULL;
1401         s64 skip = 0;
1402         u64 head;
1403         ssize_t err;
1404         void *p;
1405
1406         perf_tool__fill_defaults(tool);
1407
1408         head = 0;
1409         cur_size = sizeof(union perf_event);
1410
1411         buf = malloc(cur_size);
1412         if (!buf)
1413                 return -errno;
1414 more:
1415         event = buf;
1416         err = readn(fd, event, sizeof(struct perf_event_header));
1417         if (err <= 0) {
1418                 if (err == 0)
1419                         goto done;
1420
1421                 pr_err("failed to read event header\n");
1422                 goto out_err;
1423         }
1424
1425         if (session->header.needs_swap)
1426                 perf_event_header__bswap(&event->header);
1427
1428         size = event->header.size;
1429         if (size < sizeof(struct perf_event_header)) {
1430                 pr_err("bad event header size\n");
1431                 goto out_err;
1432         }
1433
1434         if (size > cur_size) {
1435                 void *new = realloc(buf, size);
1436                 if (!new) {
1437                         pr_err("failed to allocate memory to read event\n");
1438                         goto out_err;
1439                 }
1440                 buf = new;
1441                 cur_size = size;
1442                 event = buf;
1443         }
1444         p = event;
1445         p += sizeof(struct perf_event_header);
1446
1447         if (size - sizeof(struct perf_event_header)) {
1448                 err = readn(fd, p, size - sizeof(struct perf_event_header));
1449                 if (err <= 0) {
1450                         if (err == 0) {
1451                                 pr_err("unexpected end of event stream\n");
1452                                 goto done;
1453                         }
1454
1455                         pr_err("failed to read event data\n");
1456                         goto out_err;
1457                 }
1458         }
1459
1460         if ((skip = perf_session__process_event(session, event, head)) < 0) {
1461                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1462                        head, event->header.size, event->header.type);
1463                 err = -EINVAL;
1464                 goto out_err;
1465         }
1466
1467         head += size;
1468
1469         if (skip > 0)
1470                 head += skip;
1471
1472         if (!session_done())
1473                 goto more;
1474 done:
1475         /* do the final flush for ordered samples */
1476         err = ordered_events__flush(oe, OE_FLUSH__FINAL);
1477         if (err)
1478                 goto out_err;
1479         err = auxtrace__flush_events(session, tool);
1480         if (err)
1481                 goto out_err;
1482         err = perf_session__flush_thread_stacks(session);
1483 out_err:
1484         free(buf);
1485         perf_session__warn_about_errors(session);
1486         ordered_events__free(&session->ordered_events);
1487         auxtrace__free_events(session);
1488         return err;
1489 }
1490
1491 static union perf_event *
1492 fetch_mmaped_event(struct perf_session *session,
1493                    u64 head, size_t mmap_size, char *buf)
1494 {
1495         union perf_event *event;
1496
1497         /*
1498          * Ensure we have enough space remaining to read
1499          * the size of the event in the headers.
1500          */
1501         if (head + sizeof(event->header) > mmap_size)
1502                 return NULL;
1503
1504         event = (union perf_event *)(buf + head);
1505
1506         if (session->header.needs_swap)
1507                 perf_event_header__bswap(&event->header);
1508
1509         if (head + event->header.size > mmap_size) {
1510                 /* We're not fetching the event so swap back again */
1511                 if (session->header.needs_swap)
1512                         perf_event_header__bswap(&event->header);
1513                 return NULL;
1514         }
1515
1516         return event;
1517 }
1518
1519 /*
1520  * On 64bit we can mmap the data file in one go. No need for tiny mmap
1521  * slices. On 32bit we use 32MB.
1522  */
1523 #if BITS_PER_LONG == 64
1524 #define MMAP_SIZE ULLONG_MAX
1525 #define NUM_MMAPS 1
1526 #else
1527 #define MMAP_SIZE (32 * 1024 * 1024ULL)
1528 #define NUM_MMAPS 128
1529 #endif
1530
1531 static int __perf_session__process_events(struct perf_session *session,
1532                                           u64 data_offset, u64 data_size,
1533                                           u64 file_size)
1534 {
1535         struct ordered_events *oe = &session->ordered_events;
1536         struct perf_tool *tool = session->tool;
1537         int fd = perf_data_file__fd(session->file);
1538         u64 head, page_offset, file_offset, file_pos, size;
1539         int err, mmap_prot, mmap_flags, map_idx = 0;
1540         size_t  mmap_size;
1541         char *buf, *mmaps[NUM_MMAPS];
1542         union perf_event *event;
1543         struct ui_progress prog;
1544         s64 skip;
1545
1546         perf_tool__fill_defaults(tool);
1547
1548         page_offset = page_size * (data_offset / page_size);
1549         file_offset = page_offset;
1550         head = data_offset - page_offset;
1551
1552         if (data_size == 0)
1553                 goto out;
1554
1555         if (data_offset + data_size < file_size)
1556                 file_size = data_offset + data_size;
1557
1558         ui_progress__init(&prog, file_size, "Processing events...");
1559
1560         mmap_size = MMAP_SIZE;
1561         if (mmap_size > file_size) {
1562                 mmap_size = file_size;
1563                 session->one_mmap = true;
1564         }
1565
1566         memset(mmaps, 0, sizeof(mmaps));
1567
1568         mmap_prot  = PROT_READ;
1569         mmap_flags = MAP_SHARED;
1570
1571         if (session->header.needs_swap) {
1572                 mmap_prot  |= PROT_WRITE;
1573                 mmap_flags = MAP_PRIVATE;
1574         }
1575 remap:
1576         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, fd,
1577                    file_offset);
1578         if (buf == MAP_FAILED) {
1579                 pr_err("failed to mmap file\n");
1580                 err = -errno;
1581                 goto out_err;
1582         }
1583         mmaps[map_idx] = buf;
1584         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1585         file_pos = file_offset + head;
1586         if (session->one_mmap) {
1587                 session->one_mmap_addr = buf;
1588                 session->one_mmap_offset = file_offset;
1589         }
1590
1591 more:
1592         event = fetch_mmaped_event(session, head, mmap_size, buf);
1593         if (!event) {
1594                 if (mmaps[map_idx]) {
1595                         munmap(mmaps[map_idx], mmap_size);
1596                         mmaps[map_idx] = NULL;
1597                 }
1598
1599                 page_offset = page_size * (head / page_size);
1600                 file_offset += page_offset;
1601                 head -= page_offset;
1602                 goto remap;
1603         }
1604
1605         size = event->header.size;
1606
1607         if (size < sizeof(struct perf_event_header) ||
1608             (skip = perf_session__process_event(session, event, file_pos)) < 0) {
1609                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1610                        file_offset + head, event->header.size,
1611                        event->header.type);
1612                 err = -EINVAL;
1613                 goto out_err;
1614         }
1615
1616         if (skip)
1617                 size += skip;
1618
1619         head += size;
1620         file_pos += size;
1621
1622         ui_progress__update(&prog, size);
1623
1624         if (session_done())
1625                 goto out;
1626
1627         if (file_pos < file_size)
1628                 goto more;
1629
1630 out:
1631         /* do the final flush for ordered samples */
1632         err = ordered_events__flush(oe, OE_FLUSH__FINAL);
1633         if (err)
1634                 goto out_err;
1635         err = auxtrace__flush_events(session, tool);
1636         if (err)
1637                 goto out_err;
1638         err = perf_session__flush_thread_stacks(session);
1639 out_err:
1640         ui_progress__finish();
1641         perf_session__warn_about_errors(session);
1642         ordered_events__free(&session->ordered_events);
1643         auxtrace__free_events(session);
1644         session->one_mmap = false;
1645         return err;
1646 }
1647
1648 int perf_session__process_events(struct perf_session *session)
1649 {
1650         u64 size = perf_data_file__size(session->file);
1651         int err;
1652
1653         if (perf_session__register_idle_thread(session) == NULL)
1654                 return -ENOMEM;
1655
1656         if (!perf_data_file__is_pipe(session->file))
1657                 err = __perf_session__process_events(session,
1658                                                      session->header.data_offset,
1659                                                      session->header.data_size, size);
1660         else
1661                 err = __perf_session__process_pipe_events(session);
1662
1663         return err;
1664 }
1665
1666 bool perf_session__has_traces(struct perf_session *session, const char *msg)
1667 {
1668         struct perf_evsel *evsel;
1669
1670         evlist__for_each(session->evlist, evsel) {
1671                 if (evsel->attr.type == PERF_TYPE_TRACEPOINT)
1672                         return true;
1673         }
1674
1675         pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1676         return false;
1677 }
1678
1679 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1680                                      const char *symbol_name, u64 addr)
1681 {
1682         char *bracket;
1683         enum map_type i;
1684         struct ref_reloc_sym *ref;
1685
1686         ref = zalloc(sizeof(struct ref_reloc_sym));
1687         if (ref == NULL)
1688                 return -ENOMEM;
1689
1690         ref->name = strdup(symbol_name);
1691         if (ref->name == NULL) {
1692                 free(ref);
1693                 return -ENOMEM;
1694         }
1695
1696         bracket = strchr(ref->name, ']');
1697         if (bracket)
1698                 *bracket = '\0';
1699
1700         ref->addr = addr;
1701
1702         for (i = 0; i < MAP__NR_TYPES; ++i) {
1703                 struct kmap *kmap = map__kmap(maps[i]);
1704
1705                 if (!kmap)
1706                         continue;
1707                 kmap->ref_reloc_sym = ref;
1708         }
1709
1710         return 0;
1711 }
1712
1713 size_t perf_session__fprintf_dsos(struct perf_session *session, FILE *fp)
1714 {
1715         return machines__fprintf_dsos(&session->machines, fp);
1716 }
1717
1718 size_t perf_session__fprintf_dsos_buildid(struct perf_session *session, FILE *fp,
1719                                           bool (skip)(struct dso *dso, int parm), int parm)
1720 {
1721         return machines__fprintf_dsos_buildid(&session->machines, fp, skip, parm);
1722 }
1723
1724 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1725 {
1726         size_t ret;
1727         const char *msg = "";
1728
1729         if (perf_header__has_feat(&session->header, HEADER_AUXTRACE))
1730                 msg = " (excludes AUX area (e.g. instruction trace) decoded / synthesized events)";
1731
1732         ret = fprintf(fp, "\nAggregated stats:%s\n", msg);
1733
1734         ret += events_stats__fprintf(&session->evlist->stats, fp);
1735         return ret;
1736 }
1737
1738 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1739 {
1740         /*
1741          * FIXME: Here we have to actually print all the machines in this
1742          * session, not just the host...
1743          */
1744         return machine__fprintf(&session->machines.host, fp);
1745 }
1746
1747 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1748                                               unsigned int type)
1749 {
1750         struct perf_evsel *pos;
1751
1752         evlist__for_each(session->evlist, pos) {
1753                 if (pos->attr.type == type)
1754                         return pos;
1755         }
1756         return NULL;
1757 }
1758
1759 void perf_evsel__print_ip(struct perf_evsel *evsel, struct perf_sample *sample,
1760                           struct addr_location *al,
1761                           unsigned int print_opts, unsigned int stack_depth)
1762 {
1763         struct callchain_cursor_node *node;
1764         int print_ip = print_opts & PRINT_IP_OPT_IP;
1765         int print_sym = print_opts & PRINT_IP_OPT_SYM;
1766         int print_dso = print_opts & PRINT_IP_OPT_DSO;
1767         int print_symoffset = print_opts & PRINT_IP_OPT_SYMOFFSET;
1768         int print_oneline = print_opts & PRINT_IP_OPT_ONELINE;
1769         int print_srcline = print_opts & PRINT_IP_OPT_SRCLINE;
1770         char s = print_oneline ? ' ' : '\t';
1771
1772         if (symbol_conf.use_callchain && sample->callchain) {
1773                 struct addr_location node_al;
1774
1775                 if (thread__resolve_callchain(al->thread, evsel,
1776                                               sample, NULL, NULL,
1777                                               stack_depth) != 0) {
1778                         if (verbose)
1779                                 error("Failed to resolve callchain. Skipping\n");
1780                         return;
1781                 }
1782                 callchain_cursor_commit(&callchain_cursor);
1783
1784                 if (print_symoffset)
1785                         node_al = *al;
1786
1787                 while (stack_depth) {
1788                         u64 addr = 0;
1789
1790                         node = callchain_cursor_current(&callchain_cursor);
1791                         if (!node)
1792                                 break;
1793
1794                         if (node->sym && node->sym->ignore)
1795                                 goto next;
1796
1797                         if (print_ip)
1798                                 printf("%c%16" PRIx64, s, node->ip);
1799
1800                         if (node->map)
1801                                 addr = node->map->map_ip(node->map, node->ip);
1802
1803                         if (print_sym) {
1804                                 printf(" ");
1805                                 if (print_symoffset) {
1806                                         node_al.addr = addr;
1807                                         node_al.map  = node->map;
1808                                         symbol__fprintf_symname_offs(node->sym, &node_al, stdout);
1809                                 } else
1810                                         symbol__fprintf_symname(node->sym, stdout);
1811                         }
1812
1813                         if (print_dso) {
1814                                 printf(" (");
1815                                 map__fprintf_dsoname(node->map, stdout);
1816                                 printf(")");
1817                         }
1818
1819                         if (print_srcline)
1820                                 map__fprintf_srcline(node->map, addr, "\n  ",
1821                                                      stdout);
1822
1823                         if (!print_oneline)
1824                                 printf("\n");
1825
1826                         stack_depth--;
1827 next:
1828                         callchain_cursor_advance(&callchain_cursor);
1829                 }
1830
1831         } else {
1832                 if (al->sym && al->sym->ignore)
1833                         return;
1834
1835                 if (print_ip)
1836                         printf("%16" PRIx64, sample->ip);
1837
1838                 if (print_sym) {
1839                         printf(" ");
1840                         if (print_symoffset)
1841                                 symbol__fprintf_symname_offs(al->sym, al,
1842                                                              stdout);
1843                         else
1844                                 symbol__fprintf_symname(al->sym, stdout);
1845                 }
1846
1847                 if (print_dso) {
1848                         printf(" (");
1849                         map__fprintf_dsoname(al->map, stdout);
1850                         printf(")");
1851                 }
1852
1853                 if (print_srcline)
1854                         map__fprintf_srcline(al->map, al->addr, "\n  ", stdout);
1855         }
1856 }
1857
1858 int perf_session__cpu_bitmap(struct perf_session *session,
1859                              const char *cpu_list, unsigned long *cpu_bitmap)
1860 {
1861         int i, err = -1;
1862         struct cpu_map *map;
1863
1864         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1865                 struct perf_evsel *evsel;
1866
1867                 evsel = perf_session__find_first_evtype(session, i);
1868                 if (!evsel)
1869                         continue;
1870
1871                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1872                         pr_err("File does not contain CPU events. "
1873                                "Remove -c option to proceed.\n");
1874                         return -1;
1875                 }
1876         }
1877
1878         map = cpu_map__new(cpu_list);
1879         if (map == NULL) {
1880                 pr_err("Invalid cpu_list\n");
1881                 return -1;
1882         }
1883
1884         for (i = 0; i < map->nr; i++) {
1885                 int cpu = map->map[i];
1886
1887                 if (cpu >= MAX_NR_CPUS) {
1888                         pr_err("Requested CPU %d too large. "
1889                                "Consider raising MAX_NR_CPUS\n", cpu);
1890                         goto out_delete_map;
1891                 }
1892
1893                 set_bit(cpu, cpu_bitmap);
1894         }
1895
1896         err = 0;
1897
1898 out_delete_map:
1899         cpu_map__put(map);
1900         return err;
1901 }
1902
1903 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1904                                 bool full)
1905 {
1906         struct stat st;
1907         int fd, ret;
1908
1909         if (session == NULL || fp == NULL)
1910                 return;
1911
1912         fd = perf_data_file__fd(session->file);
1913
1914         ret = fstat(fd, &st);
1915         if (ret == -1)
1916                 return;
1917
1918         fprintf(fp, "# ========\n");
1919         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1920         perf_header__fprintf_info(session, fp, full);
1921         fprintf(fp, "# ========\n#\n");
1922 }
1923
1924
1925 int __perf_session__set_tracepoints_handlers(struct perf_session *session,
1926                                              const struct perf_evsel_str_handler *assocs,
1927                                              size_t nr_assocs)
1928 {
1929         struct perf_evsel *evsel;
1930         size_t i;
1931         int err;
1932
1933         for (i = 0; i < nr_assocs; i++) {
1934                 /*
1935                  * Adding a handler for an event not in the session,
1936                  * just ignore it.
1937                  */
1938                 evsel = perf_evlist__find_tracepoint_by_name(session->evlist, assocs[i].name);
1939                 if (evsel == NULL)
1940                         continue;
1941
1942                 err = -EEXIST;
1943                 if (evsel->handler != NULL)
1944                         goto out;
1945                 evsel->handler = assocs[i].handler;
1946         }
1947
1948         err = 0;
1949 out:
1950         return err;
1951 }
1952
1953 int perf_event__process_id_index(struct perf_tool *tool __maybe_unused,
1954                                  union perf_event *event,
1955                                  struct perf_session *session)
1956 {
1957         struct perf_evlist *evlist = session->evlist;
1958         struct id_index_event *ie = &event->id_index;
1959         size_t i, nr, max_nr;
1960
1961         max_nr = (ie->header.size - sizeof(struct id_index_event)) /
1962                  sizeof(struct id_index_entry);
1963         nr = ie->nr;
1964         if (nr > max_nr)
1965                 return -EINVAL;
1966
1967         if (dump_trace)
1968                 fprintf(stdout, " nr: %zu\n", nr);
1969
1970         for (i = 0; i < nr; i++) {
1971                 struct id_index_entry *e = &ie->entries[i];
1972                 struct perf_sample_id *sid;
1973
1974                 if (dump_trace) {
1975                         fprintf(stdout, " ... id: %"PRIu64, e->id);
1976                         fprintf(stdout, "  idx: %"PRIu64, e->idx);
1977                         fprintf(stdout, "  cpu: %"PRId64, e->cpu);
1978                         fprintf(stdout, "  tid: %"PRId64"\n", e->tid);
1979                 }
1980
1981                 sid = perf_evlist__id2sid(evlist, e->id);
1982                 if (!sid)
1983                         return -ENOENT;
1984                 sid->idx = e->idx;
1985                 sid->cpu = e->cpu;
1986                 sid->tid = e->tid;
1987         }
1988         return 0;
1989 }
1990
1991 int perf_event__synthesize_id_index(struct perf_tool *tool,
1992                                     perf_event__handler_t process,
1993                                     struct perf_evlist *evlist,
1994                                     struct machine *machine)
1995 {
1996         union perf_event *ev;
1997         struct perf_evsel *evsel;
1998         size_t nr = 0, i = 0, sz, max_nr, n;
1999         int err;
2000
2001         pr_debug2("Synthesizing id index\n");
2002
2003         max_nr = (UINT16_MAX - sizeof(struct id_index_event)) /
2004                  sizeof(struct id_index_entry);
2005
2006         evlist__for_each(evlist, evsel)
2007                 nr += evsel->ids;
2008
2009         n = nr > max_nr ? max_nr : nr;
2010         sz = sizeof(struct id_index_event) + n * sizeof(struct id_index_entry);
2011         ev = zalloc(sz);
2012         if (!ev)
2013                 return -ENOMEM;
2014
2015         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
2016         ev->id_index.header.size = sz;
2017         ev->id_index.nr = n;
2018
2019         evlist__for_each(evlist, evsel) {
2020                 u32 j;
2021
2022                 for (j = 0; j < evsel->ids; j++) {
2023                         struct id_index_entry *e;
2024                         struct perf_sample_id *sid;
2025
2026                         if (i >= n) {
2027                                 err = process(tool, ev, NULL, machine);
2028                                 if (err)
2029                                         goto out_err;
2030                                 nr -= n;
2031                                 i = 0;
2032                         }
2033
2034                         e = &ev->id_index.entries[i++];
2035
2036                         e->id = evsel->id[j];
2037
2038                         sid = perf_evlist__id2sid(evlist, e->id);
2039                         if (!sid) {
2040                                 free(ev);
2041                                 return -ENOENT;
2042                         }
2043
2044                         e->idx = sid->idx;
2045                         e->cpu = sid->cpu;
2046                         e->tid = sid->tid;
2047                 }
2048         }
2049
2050         sz = sizeof(struct id_index_event) + nr * sizeof(struct id_index_entry);
2051         ev->id_index.header.size = sz;
2052         ev->id_index.nr = nr;
2053
2054         err = process(tool, ev, NULL, machine);
2055 out_err:
2056         free(ev);
2057
2058         return err;
2059 }