1 #define _FILE_OFFSET_BITS 64 2 3 #include <linux/kernel.h> 4 5 #include <byteswap.h> 6 #include <unistd.h> 7 #include <sys/types.h> 8 #include <sys/mman.h> 9 10 #include "session.h" 11 #include "sort.h" 12 #include "util.h" 13 14 static int perf_session__open(struct perf_session *self, bool force) 15 { 16 struct stat input_stat; 17 18 if (!strcmp(self->filename, "-")) { 19 self->fd_pipe = true; 20 self->fd = STDIN_FILENO; 21 22 if (perf_header__read(self, self->fd) < 0) 23 pr_err("incompatible file format"); 24 25 return 0; 26 } 27 28 self->fd = open(self->filename, O_RDONLY); 29 if (self->fd < 0) { 30 int err = errno; 31 32 pr_err("failed to open %s: %s", self->filename, strerror(err)); 33 if (err == ENOENT && !strcmp(self->filename, "perf.data")) 34 pr_err(" (try 'perf record' first)"); 35 pr_err("\n"); 36 return -errno; 37 } 38 39 if (fstat(self->fd, &input_stat) < 0) 40 goto out_close; 41 42 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 43 pr_err("file %s not owned by current user or root\n", 44 self->filename); 45 goto out_close; 46 } 47 48 if (!input_stat.st_size) { 49 pr_info("zero-sized file (%s), nothing to do!\n", 50 self->filename); 51 goto out_close; 52 } 53 54 if (perf_header__read(self, self->fd) < 0) { 55 pr_err("incompatible file format"); 56 goto out_close; 57 } 58 59 self->size = input_stat.st_size; 60 return 0; 61 62 out_close: 63 close(self->fd); 64 self->fd = -1; 65 return -1; 66 } 67 68 static void perf_session__id_header_size(struct perf_session *session) 69 { 70 struct sample_data *data; 71 u64 sample_type = session->sample_type; 72 u16 size = 0; 73 74 if (!session->sample_id_all) 75 goto out; 76 77 if (sample_type & PERF_SAMPLE_TID) 78 size += sizeof(data->tid) * 2; 79 80 if (sample_type & PERF_SAMPLE_TIME) 81 size += sizeof(data->time); 82 83 if (sample_type & PERF_SAMPLE_ID) 84 size += sizeof(data->id); 85 86 if (sample_type & PERF_SAMPLE_STREAM_ID) 87 size += sizeof(data->stream_id); 88 89 if (sample_type & PERF_SAMPLE_CPU) 90 size += sizeof(data->cpu) * 2; 91 out: 92 session->id_hdr_size = size; 93 } 94 95 void perf_session__set_sample_id_all(struct perf_session *session, bool value) 96 { 97 session->sample_id_all = value; 98 perf_session__id_header_size(session); 99 } 100 101 void perf_session__set_sample_type(struct perf_session *session, u64 type) 102 { 103 session->sample_type = type; 104 } 105 106 void perf_session__update_sample_type(struct perf_session *self) 107 { 108 self->sample_type = perf_header__sample_type(&self->header); 109 self->sample_id_all = perf_header__sample_id_all(&self->header); 110 perf_session__id_header_size(self); 111 } 112 113 int perf_session__create_kernel_maps(struct perf_session *self) 114 { 115 int ret = machine__create_kernel_maps(&self->host_machine); 116 117 if (ret >= 0) 118 ret = machines__create_guest_kernel_maps(&self->machines); 119 return ret; 120 } 121 122 static void perf_session__destroy_kernel_maps(struct perf_session *self) 123 { 124 machine__destroy_kernel_maps(&self->host_machine); 125 machines__destroy_guest_kernel_maps(&self->machines); 126 } 127 128 struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe) 129 { 130 size_t len = filename ? strlen(filename) + 1 : 0; 131 struct perf_session *self = zalloc(sizeof(*self) + len); 132 133 if (self == NULL) 134 goto out; 135 136 if (perf_header__init(&self->header) < 0) 137 goto out_free; 138 139 memcpy(self->filename, filename, len); 140 self->threads = RB_ROOT; 141 INIT_LIST_HEAD(&self->dead_threads); 142 self->hists_tree = RB_ROOT; 143 self->last_match = NULL; 144 /* 145 * On 64bit we can mmap the data file in one go. No need for tiny mmap 146 * slices. On 32bit we use 32MB. 147 */ 148 #if BITS_PER_LONG == 64 149 self->mmap_window = ULLONG_MAX; 150 #else 151 self->mmap_window = 32 * 1024 * 1024ULL; 152 #endif 153 self->machines = RB_ROOT; 154 self->repipe = repipe; 155 INIT_LIST_HEAD(&self->ordered_samples.samples); 156 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 157 INIT_LIST_HEAD(&self->ordered_samples.to_free); 158 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 159 160 if (mode == O_RDONLY) { 161 if (perf_session__open(self, force) < 0) 162 goto out_delete; 163 } else if (mode == O_WRONLY) { 164 /* 165 * In O_RDONLY mode this will be performed when reading the 166 * kernel MMAP event, in event__process_mmap(). 167 */ 168 if (perf_session__create_kernel_maps(self) < 0) 169 goto out_delete; 170 } 171 172 perf_session__update_sample_type(self); 173 out: 174 return self; 175 out_free: 176 free(self); 177 return NULL; 178 out_delete: 179 perf_session__delete(self); 180 return NULL; 181 } 182 183 static void perf_session__delete_dead_threads(struct perf_session *self) 184 { 185 struct thread *n, *t; 186 187 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 188 list_del(&t->node); 189 thread__delete(t); 190 } 191 } 192 193 static void perf_session__delete_threads(struct perf_session *self) 194 { 195 struct rb_node *nd = rb_first(&self->threads); 196 197 while (nd) { 198 struct thread *t = rb_entry(nd, struct thread, rb_node); 199 200 rb_erase(&t->rb_node, &self->threads); 201 nd = rb_next(nd); 202 thread__delete(t); 203 } 204 } 205 206 void perf_session__delete(struct perf_session *self) 207 { 208 perf_header__exit(&self->header); 209 perf_session__destroy_kernel_maps(self); 210 perf_session__delete_dead_threads(self); 211 perf_session__delete_threads(self); 212 machine__exit(&self->host_machine); 213 close(self->fd); 214 free(self); 215 } 216 217 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 218 { 219 self->last_match = NULL; 220 rb_erase(&th->rb_node, &self->threads); 221 /* 222 * We may have references to this thread, for instance in some hist_entry 223 * instances, so just move them to a separate list. 224 */ 225 list_add_tail(&th->node, &self->dead_threads); 226 } 227 228 static bool symbol__match_parent_regex(struct symbol *sym) 229 { 230 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 231 return 1; 232 233 return 0; 234 } 235 236 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self, 237 struct thread *thread, 238 struct ip_callchain *chain, 239 struct symbol **parent) 240 { 241 u8 cpumode = PERF_RECORD_MISC_USER; 242 unsigned int i; 243 struct map_symbol *syms = calloc(chain->nr, sizeof(*syms)); 244 245 if (!syms) 246 return NULL; 247 248 for (i = 0; i < chain->nr; i++) { 249 u64 ip = chain->ips[i]; 250 struct addr_location al; 251 252 if (ip >= PERF_CONTEXT_MAX) { 253 switch (ip) { 254 case PERF_CONTEXT_HV: 255 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 256 case PERF_CONTEXT_KERNEL: 257 cpumode = PERF_RECORD_MISC_KERNEL; break; 258 case PERF_CONTEXT_USER: 259 cpumode = PERF_RECORD_MISC_USER; break; 260 default: 261 break; 262 } 263 continue; 264 } 265 266 al.filtered = false; 267 thread__find_addr_location(thread, self, cpumode, 268 MAP__FUNCTION, thread->pid, ip, &al, NULL); 269 if (al.sym != NULL) { 270 if (sort__has_parent && !*parent && 271 symbol__match_parent_regex(al.sym)) 272 *parent = al.sym; 273 if (!symbol_conf.use_callchain) 274 break; 275 syms[i].map = al.map; 276 syms[i].sym = al.sym; 277 } 278 } 279 280 return syms; 281 } 282 283 static int process_event_synth_stub(event_t *event __used, 284 struct perf_session *session __used) 285 { 286 dump_printf(": unhandled!\n"); 287 return 0; 288 } 289 290 static int process_event_stub(event_t *event __used, 291 struct sample_data *sample __used, 292 struct perf_session *session __used) 293 { 294 dump_printf(": unhandled!\n"); 295 return 0; 296 } 297 298 static int process_finished_round_stub(event_t *event __used, 299 struct perf_session *session __used, 300 struct perf_event_ops *ops __used) 301 { 302 dump_printf(": unhandled!\n"); 303 return 0; 304 } 305 306 static int process_finished_round(event_t *event, 307 struct perf_session *session, 308 struct perf_event_ops *ops); 309 310 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 311 { 312 if (handler->sample == NULL) 313 handler->sample = process_event_stub; 314 if (handler->mmap == NULL) 315 handler->mmap = process_event_stub; 316 if (handler->comm == NULL) 317 handler->comm = process_event_stub; 318 if (handler->fork == NULL) 319 handler->fork = process_event_stub; 320 if (handler->exit == NULL) 321 handler->exit = process_event_stub; 322 if (handler->lost == NULL) 323 handler->lost = event__process_lost; 324 if (handler->read == NULL) 325 handler->read = process_event_stub; 326 if (handler->throttle == NULL) 327 handler->throttle = process_event_stub; 328 if (handler->unthrottle == NULL) 329 handler->unthrottle = process_event_stub; 330 if (handler->attr == NULL) 331 handler->attr = process_event_synth_stub; 332 if (handler->event_type == NULL) 333 handler->event_type = process_event_synth_stub; 334 if (handler->tracing_data == NULL) 335 handler->tracing_data = process_event_synth_stub; 336 if (handler->build_id == NULL) 337 handler->build_id = process_event_synth_stub; 338 if (handler->finished_round == NULL) { 339 if (handler->ordered_samples) 340 handler->finished_round = process_finished_round; 341 else 342 handler->finished_round = process_finished_round_stub; 343 } 344 } 345 346 void mem_bswap_64(void *src, int byte_size) 347 { 348 u64 *m = src; 349 350 while (byte_size > 0) { 351 *m = bswap_64(*m); 352 byte_size -= sizeof(u64); 353 ++m; 354 } 355 } 356 357 static void event__all64_swap(event_t *self) 358 { 359 struct perf_event_header *hdr = &self->header; 360 mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr)); 361 } 362 363 static void event__comm_swap(event_t *self) 364 { 365 self->comm.pid = bswap_32(self->comm.pid); 366 self->comm.tid = bswap_32(self->comm.tid); 367 } 368 369 static void event__mmap_swap(event_t *self) 370 { 371 self->mmap.pid = bswap_32(self->mmap.pid); 372 self->mmap.tid = bswap_32(self->mmap.tid); 373 self->mmap.start = bswap_64(self->mmap.start); 374 self->mmap.len = bswap_64(self->mmap.len); 375 self->mmap.pgoff = bswap_64(self->mmap.pgoff); 376 } 377 378 static void event__task_swap(event_t *self) 379 { 380 self->fork.pid = bswap_32(self->fork.pid); 381 self->fork.tid = bswap_32(self->fork.tid); 382 self->fork.ppid = bswap_32(self->fork.ppid); 383 self->fork.ptid = bswap_32(self->fork.ptid); 384 self->fork.time = bswap_64(self->fork.time); 385 } 386 387 static void event__read_swap(event_t *self) 388 { 389 self->read.pid = bswap_32(self->read.pid); 390 self->read.tid = bswap_32(self->read.tid); 391 self->read.value = bswap_64(self->read.value); 392 self->read.time_enabled = bswap_64(self->read.time_enabled); 393 self->read.time_running = bswap_64(self->read.time_running); 394 self->read.id = bswap_64(self->read.id); 395 } 396 397 static void event__attr_swap(event_t *self) 398 { 399 size_t size; 400 401 self->attr.attr.type = bswap_32(self->attr.attr.type); 402 self->attr.attr.size = bswap_32(self->attr.attr.size); 403 self->attr.attr.config = bswap_64(self->attr.attr.config); 404 self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period); 405 self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type); 406 self->attr.attr.read_format = bswap_64(self->attr.attr.read_format); 407 self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events); 408 self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type); 409 self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr); 410 self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len); 411 412 size = self->header.size; 413 size -= (void *)&self->attr.id - (void *)self; 414 mem_bswap_64(self->attr.id, size); 415 } 416 417 static void event__event_type_swap(event_t *self) 418 { 419 self->event_type.event_type.event_id = 420 bswap_64(self->event_type.event_type.event_id); 421 } 422 423 static void event__tracing_data_swap(event_t *self) 424 { 425 self->tracing_data.size = bswap_32(self->tracing_data.size); 426 } 427 428 typedef void (*event__swap_op)(event_t *self); 429 430 static event__swap_op event__swap_ops[] = { 431 [PERF_RECORD_MMAP] = event__mmap_swap, 432 [PERF_RECORD_COMM] = event__comm_swap, 433 [PERF_RECORD_FORK] = event__task_swap, 434 [PERF_RECORD_EXIT] = event__task_swap, 435 [PERF_RECORD_LOST] = event__all64_swap, 436 [PERF_RECORD_READ] = event__read_swap, 437 [PERF_RECORD_SAMPLE] = event__all64_swap, 438 [PERF_RECORD_HEADER_ATTR] = event__attr_swap, 439 [PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap, 440 [PERF_RECORD_HEADER_TRACING_DATA] = event__tracing_data_swap, 441 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 442 [PERF_RECORD_HEADER_MAX] = NULL, 443 }; 444 445 struct sample_queue { 446 u64 timestamp; 447 event_t *event; 448 struct list_head list; 449 }; 450 451 static void perf_session_free_sample_buffers(struct perf_session *session) 452 { 453 struct ordered_samples *os = &session->ordered_samples; 454 455 while (!list_empty(&os->to_free)) { 456 struct sample_queue *sq; 457 458 sq = list_entry(os->to_free.next, struct sample_queue, list); 459 list_del(&sq->list); 460 free(sq); 461 } 462 } 463 464 static int perf_session_deliver_event(struct perf_session *session, 465 event_t *event, 466 struct sample_data *sample, 467 struct perf_event_ops *ops); 468 469 static void flush_sample_queue(struct perf_session *s, 470 struct perf_event_ops *ops) 471 { 472 struct ordered_samples *os = &s->ordered_samples; 473 struct list_head *head = &os->samples; 474 struct sample_queue *tmp, *iter; 475 struct sample_data sample; 476 u64 limit = os->next_flush; 477 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 478 479 if (!ops->ordered_samples || !limit) 480 return; 481 482 list_for_each_entry_safe(iter, tmp, head, list) { 483 if (iter->timestamp > limit) 484 break; 485 486 event__parse_sample(iter->event, s, &sample); 487 perf_session_deliver_event(s, iter->event, &sample, ops); 488 489 os->last_flush = iter->timestamp; 490 list_del(&iter->list); 491 list_add(&iter->list, &os->sample_cache); 492 } 493 494 if (list_empty(head)) { 495 os->last_sample = NULL; 496 } else if (last_ts <= limit) { 497 os->last_sample = 498 list_entry(head->prev, struct sample_queue, list); 499 } 500 } 501 502 /* 503 * When perf record finishes a pass on every buffers, it records this pseudo 504 * event. 505 * We record the max timestamp t found in the pass n. 506 * Assuming these timestamps are monotonic across cpus, we know that if 507 * a buffer still has events with timestamps below t, they will be all 508 * available and then read in the pass n + 1. 509 * Hence when we start to read the pass n + 2, we can safely flush every 510 * events with timestamps below t. 511 * 512 * ============ PASS n ================= 513 * CPU 0 | CPU 1 514 * | 515 * cnt1 timestamps | cnt2 timestamps 516 * 1 | 2 517 * 2 | 3 518 * - | 4 <--- max recorded 519 * 520 * ============ PASS n + 1 ============== 521 * CPU 0 | CPU 1 522 * | 523 * cnt1 timestamps | cnt2 timestamps 524 * 3 | 5 525 * 4 | 6 526 * 5 | 7 <---- max recorded 527 * 528 * Flush every events below timestamp 4 529 * 530 * ============ PASS n + 2 ============== 531 * CPU 0 | CPU 1 532 * | 533 * cnt1 timestamps | cnt2 timestamps 534 * 6 | 8 535 * 7 | 9 536 * - | 10 537 * 538 * Flush every events below timestamp 7 539 * etc... 540 */ 541 static int process_finished_round(event_t *event __used, 542 struct perf_session *session, 543 struct perf_event_ops *ops) 544 { 545 flush_sample_queue(session, ops); 546 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 547 548 return 0; 549 } 550 551 /* The queue is ordered by time */ 552 static void __queue_event(struct sample_queue *new, struct perf_session *s) 553 { 554 struct ordered_samples *os = &s->ordered_samples; 555 struct sample_queue *sample = os->last_sample; 556 u64 timestamp = new->timestamp; 557 struct list_head *p; 558 559 os->last_sample = new; 560 561 if (!sample) { 562 list_add(&new->list, &os->samples); 563 os->max_timestamp = timestamp; 564 return; 565 } 566 567 /* 568 * last_sample might point to some random place in the list as it's 569 * the last queued event. We expect that the new event is close to 570 * this. 571 */ 572 if (sample->timestamp <= timestamp) { 573 while (sample->timestamp <= timestamp) { 574 p = sample->list.next; 575 if (p == &os->samples) { 576 list_add_tail(&new->list, &os->samples); 577 os->max_timestamp = timestamp; 578 return; 579 } 580 sample = list_entry(p, struct sample_queue, list); 581 } 582 list_add_tail(&new->list, &sample->list); 583 } else { 584 while (sample->timestamp > timestamp) { 585 p = sample->list.prev; 586 if (p == &os->samples) { 587 list_add(&new->list, &os->samples); 588 return; 589 } 590 sample = list_entry(p, struct sample_queue, list); 591 } 592 list_add(&new->list, &sample->list); 593 } 594 } 595 596 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 597 598 static int perf_session_queue_event(struct perf_session *s, event_t *event, 599 struct sample_data *data) 600 { 601 struct ordered_samples *os = &s->ordered_samples; 602 struct list_head *sc = &os->sample_cache; 603 u64 timestamp = data->time; 604 struct sample_queue *new; 605 606 if (!timestamp || timestamp == ~0ULL) 607 return -ETIME; 608 609 if (timestamp < s->ordered_samples.last_flush) { 610 printf("Warning: Timestamp below last timeslice flush\n"); 611 return -EINVAL; 612 } 613 614 if (!list_empty(sc)) { 615 new = list_entry(sc->next, struct sample_queue, list); 616 list_del(&new->list); 617 } else if (os->sample_buffer) { 618 new = os->sample_buffer + os->sample_buffer_idx; 619 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 620 os->sample_buffer = NULL; 621 } else { 622 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 623 if (!os->sample_buffer) 624 return -ENOMEM; 625 list_add(&os->sample_buffer->list, &os->to_free); 626 os->sample_buffer_idx = 2; 627 new = os->sample_buffer + 1; 628 } 629 630 new->timestamp = timestamp; 631 new->event = event; 632 633 __queue_event(new, s); 634 635 return 0; 636 } 637 638 static void callchain__dump(struct sample_data *sample) 639 { 640 unsigned int i; 641 642 if (!dump_trace) 643 return; 644 645 printf("... chain: nr:%Lu\n", sample->callchain->nr); 646 647 for (i = 0; i < sample->callchain->nr; i++) 648 printf("..... %2d: %016Lx\n", i, sample->callchain->ips[i]); 649 } 650 651 static void perf_session__print_tstamp(struct perf_session *session, 652 event_t *event, 653 struct sample_data *sample) 654 { 655 if (event->header.type != PERF_RECORD_SAMPLE && 656 !session->sample_id_all) { 657 fputs("-1 -1 ", stdout); 658 return; 659 } 660 661 if ((session->sample_type & PERF_SAMPLE_CPU)) 662 printf("%u ", sample->cpu); 663 664 if (session->sample_type & PERF_SAMPLE_TIME) 665 printf("%Lu ", sample->time); 666 } 667 668 static int perf_session_deliver_event(struct perf_session *session, 669 event_t *event, 670 struct sample_data *sample, 671 struct perf_event_ops *ops) 672 { 673 switch (event->header.type) { 674 case PERF_RECORD_SAMPLE: 675 return ops->sample(event, sample, session); 676 case PERF_RECORD_MMAP: 677 return ops->mmap(event, sample, session); 678 case PERF_RECORD_COMM: 679 return ops->comm(event, sample, session); 680 case PERF_RECORD_FORK: 681 return ops->fork(event, sample, session); 682 case PERF_RECORD_EXIT: 683 return ops->exit(event, sample, session); 684 case PERF_RECORD_LOST: 685 return ops->lost(event, sample, session); 686 case PERF_RECORD_READ: 687 return ops->read(event, sample, session); 688 case PERF_RECORD_THROTTLE: 689 return ops->throttle(event, sample, session); 690 case PERF_RECORD_UNTHROTTLE: 691 return ops->unthrottle(event, sample, session); 692 default: 693 ++session->hists.stats.nr_unknown_events; 694 return -1; 695 } 696 } 697 698 static int perf_session__process_event(struct perf_session *session, 699 event_t *event, 700 struct perf_event_ops *ops, 701 u64 file_offset) 702 { 703 struct sample_data sample; 704 int ret; 705 706 trace_event(event); 707 708 if (session->header.needs_swap && event__swap_ops[event->header.type]) 709 event__swap_ops[event->header.type](event); 710 711 if (event->header.type >= PERF_RECORD_MMAP && 712 event->header.type <= PERF_RECORD_SAMPLE) { 713 event__parse_sample(event, session, &sample); 714 if (dump_trace) 715 perf_session__print_tstamp(session, event, &sample); 716 } 717 718 if (event->header.type < PERF_RECORD_HEADER_MAX) { 719 dump_printf("%#Lx [%#x]: PERF_RECORD_%s", 720 file_offset, event->header.size, 721 event__get_event_name(event->header.type)); 722 hists__inc_nr_events(&session->hists, event->header.type); 723 } 724 725 /* These events are processed right away */ 726 switch (event->header.type) { 727 case PERF_RECORD_SAMPLE: 728 dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld\n", 729 event->header.misc, 730 sample.pid, sample.tid, sample.ip, sample.period); 731 732 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) { 733 if (!ip_callchain__valid(sample.callchain, event)) { 734 pr_debug("call-chain problem with event, " 735 "skipping it.\n"); 736 ++session->hists.stats.nr_invalid_chains; 737 session->hists.stats.total_invalid_chains += 738 sample.period; 739 return 0; 740 } 741 742 callchain__dump(&sample); 743 } 744 break; 745 746 case PERF_RECORD_HEADER_ATTR: 747 return ops->attr(event, session); 748 case PERF_RECORD_HEADER_EVENT_TYPE: 749 return ops->event_type(event, session); 750 case PERF_RECORD_HEADER_TRACING_DATA: 751 /* setup for reading amidst mmap */ 752 lseek(session->fd, file_offset, SEEK_SET); 753 return ops->tracing_data(event, session); 754 case PERF_RECORD_HEADER_BUILD_ID: 755 return ops->build_id(event, session); 756 case PERF_RECORD_FINISHED_ROUND: 757 return ops->finished_round(event, session, ops); 758 default: 759 break; 760 } 761 762 if (ops->ordered_samples) { 763 ret = perf_session_queue_event(session, event, &sample); 764 if (ret != -ETIME) 765 return ret; 766 } 767 768 return perf_session_deliver_event(session, event, &sample, ops); 769 } 770 771 void perf_event_header__bswap(struct perf_event_header *self) 772 { 773 self->type = bswap_32(self->type); 774 self->misc = bswap_16(self->misc); 775 self->size = bswap_16(self->size); 776 } 777 778 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 779 { 780 struct thread *thread = perf_session__findnew(self, 0); 781 782 if (thread == NULL || thread__set_comm(thread, "swapper")) { 783 pr_err("problem inserting idle task.\n"); 784 thread = NULL; 785 } 786 787 return thread; 788 } 789 790 int do_read(int fd, void *buf, size_t size) 791 { 792 void *buf_start = buf; 793 794 while (size) { 795 int ret = read(fd, buf, size); 796 797 if (ret <= 0) 798 return ret; 799 800 size -= ret; 801 buf += ret; 802 } 803 804 return buf - buf_start; 805 } 806 807 #define session_done() (*(volatile int *)(&session_done)) 808 volatile int session_done; 809 810 static int __perf_session__process_pipe_events(struct perf_session *self, 811 struct perf_event_ops *ops) 812 { 813 event_t event; 814 uint32_t size; 815 int skip = 0; 816 u64 head; 817 int err; 818 void *p; 819 820 perf_event_ops__fill_defaults(ops); 821 822 head = 0; 823 more: 824 err = do_read(self->fd, &event, sizeof(struct perf_event_header)); 825 if (err <= 0) { 826 if (err == 0) 827 goto done; 828 829 pr_err("failed to read event header\n"); 830 goto out_err; 831 } 832 833 if (self->header.needs_swap) 834 perf_event_header__bswap(&event.header); 835 836 size = event.header.size; 837 if (size == 0) 838 size = 8; 839 840 p = &event; 841 p += sizeof(struct perf_event_header); 842 843 if (size - sizeof(struct perf_event_header)) { 844 err = do_read(self->fd, p, 845 size - sizeof(struct perf_event_header)); 846 if (err <= 0) { 847 if (err == 0) { 848 pr_err("unexpected end of event stream\n"); 849 goto done; 850 } 851 852 pr_err("failed to read event data\n"); 853 goto out_err; 854 } 855 } 856 857 if (size == 0 || 858 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 859 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n", 860 head, event.header.size, event.header.type); 861 /* 862 * assume we lost track of the stream, check alignment, and 863 * increment a single u64 in the hope to catch on again 'soon'. 864 */ 865 if (unlikely(head & 7)) 866 head &= ~7ULL; 867 868 size = 8; 869 } 870 871 head += size; 872 873 dump_printf("\n%#Lx [%#x]: event: %d\n", 874 head, event.header.size, event.header.type); 875 876 if (skip > 0) 877 head += skip; 878 879 if (!session_done()) 880 goto more; 881 done: 882 err = 0; 883 out_err: 884 perf_session_free_sample_buffers(self); 885 return err; 886 } 887 888 int __perf_session__process_events(struct perf_session *session, 889 u64 data_offset, u64 data_size, 890 u64 file_size, struct perf_event_ops *ops) 891 { 892 u64 head, page_offset, file_offset, file_pos, progress_next; 893 int err, mmap_prot, mmap_flags, map_idx = 0; 894 struct ui_progress *progress; 895 size_t page_size, mmap_size; 896 char *buf, *mmaps[8]; 897 event_t *event; 898 uint32_t size; 899 900 perf_event_ops__fill_defaults(ops); 901 902 page_size = sysconf(_SC_PAGESIZE); 903 904 page_offset = page_size * (data_offset / page_size); 905 file_offset = page_offset; 906 head = data_offset - page_offset; 907 908 if (data_offset + data_size < file_size) 909 file_size = data_offset + data_size; 910 911 progress_next = file_size / 16; 912 progress = ui_progress__new("Processing events...", file_size); 913 if (progress == NULL) 914 return -1; 915 916 mmap_size = session->mmap_window; 917 if (mmap_size > file_size) 918 mmap_size = file_size; 919 920 memset(mmaps, 0, sizeof(mmaps)); 921 922 mmap_prot = PROT_READ; 923 mmap_flags = MAP_SHARED; 924 925 if (session->header.needs_swap) { 926 mmap_prot |= PROT_WRITE; 927 mmap_flags = MAP_PRIVATE; 928 } 929 remap: 930 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 931 file_offset); 932 if (buf == MAP_FAILED) { 933 pr_err("failed to mmap file\n"); 934 err = -errno; 935 goto out_err; 936 } 937 mmaps[map_idx] = buf; 938 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 939 file_pos = file_offset + head; 940 941 more: 942 event = (event_t *)(buf + head); 943 944 if (session->header.needs_swap) 945 perf_event_header__bswap(&event->header); 946 size = event->header.size; 947 if (size == 0) 948 size = 8; 949 950 if (head + event->header.size >= mmap_size) { 951 if (mmaps[map_idx]) { 952 munmap(mmaps[map_idx], mmap_size); 953 mmaps[map_idx] = NULL; 954 } 955 956 page_offset = page_size * (head / page_size); 957 file_offset += page_offset; 958 head -= page_offset; 959 goto remap; 960 } 961 962 size = event->header.size; 963 964 dump_printf("\n%#Lx [%#x]: event: %d\n", 965 file_pos, event->header.size, event->header.type); 966 967 if (size == 0 || 968 perf_session__process_event(session, event, ops, file_pos) < 0) { 969 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n", 970 file_offset + head, event->header.size, 971 event->header.type); 972 /* 973 * assume we lost track of the stream, check alignment, and 974 * increment a single u64 in the hope to catch on again 'soon'. 975 */ 976 if (unlikely(head & 7)) 977 head &= ~7ULL; 978 979 size = 8; 980 } 981 982 head += size; 983 file_pos += size; 984 985 if (file_pos >= progress_next) { 986 progress_next += file_size / 16; 987 ui_progress__update(progress, file_pos); 988 } 989 990 if (file_pos < file_size) 991 goto more; 992 993 err = 0; 994 /* do the final flush for ordered samples */ 995 session->ordered_samples.next_flush = ULLONG_MAX; 996 flush_sample_queue(session, ops); 997 out_err: 998 ui_progress__delete(progress); 999 1000 if (ops->lost == event__process_lost && 1001 session->hists.stats.total_lost != 0) { 1002 ui__warning("Processed %Lu events and LOST %Lu!\n\n" 1003 "Check IO/CPU overload!\n\n", 1004 session->hists.stats.total_period, 1005 session->hists.stats.total_lost); 1006 } 1007 1008 if (session->hists.stats.nr_unknown_events != 0) { 1009 ui__warning("Found %u unknown events!\n\n" 1010 "Is this an older tool processing a perf.data " 1011 "file generated by a more recent tool?\n\n" 1012 "If that is not the case, consider " 1013 "reporting to linux-kernel@vger.kernel.org.\n\n", 1014 session->hists.stats.nr_unknown_events); 1015 } 1016 1017 if (session->hists.stats.nr_invalid_chains != 0) { 1018 ui__warning("Found invalid callchains!\n\n" 1019 "%u out of %u events were discarded for this reason.\n\n" 1020 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 1021 session->hists.stats.nr_invalid_chains, 1022 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 1023 } 1024 1025 perf_session_free_sample_buffers(session); 1026 return err; 1027 } 1028 1029 int perf_session__process_events(struct perf_session *self, 1030 struct perf_event_ops *ops) 1031 { 1032 int err; 1033 1034 if (perf_session__register_idle_thread(self) == NULL) 1035 return -ENOMEM; 1036 1037 if (!self->fd_pipe) 1038 err = __perf_session__process_events(self, 1039 self->header.data_offset, 1040 self->header.data_size, 1041 self->size, ops); 1042 else 1043 err = __perf_session__process_pipe_events(self, ops); 1044 1045 return err; 1046 } 1047 1048 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1049 { 1050 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1051 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1052 return false; 1053 } 1054 1055 return true; 1056 } 1057 1058 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1059 const char *symbol_name, 1060 u64 addr) 1061 { 1062 char *bracket; 1063 enum map_type i; 1064 struct ref_reloc_sym *ref; 1065 1066 ref = zalloc(sizeof(struct ref_reloc_sym)); 1067 if (ref == NULL) 1068 return -ENOMEM; 1069 1070 ref->name = strdup(symbol_name); 1071 if (ref->name == NULL) { 1072 free(ref); 1073 return -ENOMEM; 1074 } 1075 1076 bracket = strchr(ref->name, ']'); 1077 if (bracket) 1078 *bracket = '\0'; 1079 1080 ref->addr = addr; 1081 1082 for (i = 0; i < MAP__NR_TYPES; ++i) { 1083 struct kmap *kmap = map__kmap(maps[i]); 1084 kmap->ref_reloc_sym = ref; 1085 } 1086 1087 return 0; 1088 } 1089 1090 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1091 { 1092 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1093 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1094 machines__fprintf_dsos(&self->machines, fp); 1095 } 1096 1097 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1098 bool with_hits) 1099 { 1100 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1101 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1102 } 1103