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, 129 bool force, bool repipe, 130 struct perf_event_ops *ops) 131 { 132 size_t len = filename ? strlen(filename) + 1 : 0; 133 struct perf_session *self = zalloc(sizeof(*self) + len); 134 135 if (self == NULL) 136 goto out; 137 138 if (perf_header__init(&self->header) < 0) 139 goto out_free; 140 141 memcpy(self->filename, filename, len); 142 self->threads = RB_ROOT; 143 INIT_LIST_HEAD(&self->dead_threads); 144 self->hists_tree = RB_ROOT; 145 self->last_match = NULL; 146 /* 147 * On 64bit we can mmap the data file in one go. No need for tiny mmap 148 * slices. On 32bit we use 32MB. 149 */ 150 #if BITS_PER_LONG == 64 151 self->mmap_window = ULLONG_MAX; 152 #else 153 self->mmap_window = 32 * 1024 * 1024ULL; 154 #endif 155 self->machines = RB_ROOT; 156 self->repipe = repipe; 157 INIT_LIST_HEAD(&self->ordered_samples.samples); 158 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 159 INIT_LIST_HEAD(&self->ordered_samples.to_free); 160 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 161 162 if (mode == O_RDONLY) { 163 if (perf_session__open(self, force) < 0) 164 goto out_delete; 165 } else if (mode == O_WRONLY) { 166 /* 167 * In O_RDONLY mode this will be performed when reading the 168 * kernel MMAP event, in event__process_mmap(). 169 */ 170 if (perf_session__create_kernel_maps(self) < 0) 171 goto out_delete; 172 } 173 174 perf_session__update_sample_type(self); 175 176 if (ops && ops->ordering_requires_timestamps && 177 ops->ordered_samples && !self->sample_id_all) { 178 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 179 ops->ordered_samples = false; 180 } 181 182 out: 183 return self; 184 out_free: 185 free(self); 186 return NULL; 187 out_delete: 188 perf_session__delete(self); 189 return NULL; 190 } 191 192 static void perf_session__delete_dead_threads(struct perf_session *self) 193 { 194 struct thread *n, *t; 195 196 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 197 list_del(&t->node); 198 thread__delete(t); 199 } 200 } 201 202 static void perf_session__delete_threads(struct perf_session *self) 203 { 204 struct rb_node *nd = rb_first(&self->threads); 205 206 while (nd) { 207 struct thread *t = rb_entry(nd, struct thread, rb_node); 208 209 rb_erase(&t->rb_node, &self->threads); 210 nd = rb_next(nd); 211 thread__delete(t); 212 } 213 } 214 215 void perf_session__delete(struct perf_session *self) 216 { 217 perf_header__exit(&self->header); 218 perf_session__destroy_kernel_maps(self); 219 perf_session__delete_dead_threads(self); 220 perf_session__delete_threads(self); 221 machine__exit(&self->host_machine); 222 close(self->fd); 223 free(self); 224 } 225 226 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 227 { 228 self->last_match = NULL; 229 rb_erase(&th->rb_node, &self->threads); 230 /* 231 * We may have references to this thread, for instance in some hist_entry 232 * instances, so just move them to a separate list. 233 */ 234 list_add_tail(&th->node, &self->dead_threads); 235 } 236 237 static bool symbol__match_parent_regex(struct symbol *sym) 238 { 239 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 240 return 1; 241 242 return 0; 243 } 244 245 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self, 246 struct thread *thread, 247 struct ip_callchain *chain, 248 struct symbol **parent) 249 { 250 u8 cpumode = PERF_RECORD_MISC_USER; 251 unsigned int i; 252 struct map_symbol *syms = calloc(chain->nr, sizeof(*syms)); 253 254 if (!syms) 255 return NULL; 256 257 for (i = 0; i < chain->nr; i++) { 258 u64 ip = chain->ips[i]; 259 struct addr_location al; 260 261 if (ip >= PERF_CONTEXT_MAX) { 262 switch (ip) { 263 case PERF_CONTEXT_HV: 264 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 265 case PERF_CONTEXT_KERNEL: 266 cpumode = PERF_RECORD_MISC_KERNEL; break; 267 case PERF_CONTEXT_USER: 268 cpumode = PERF_RECORD_MISC_USER; break; 269 default: 270 break; 271 } 272 continue; 273 } 274 275 al.filtered = false; 276 thread__find_addr_location(thread, self, cpumode, 277 MAP__FUNCTION, thread->pid, ip, &al, NULL); 278 if (al.sym != NULL) { 279 if (sort__has_parent && !*parent && 280 symbol__match_parent_regex(al.sym)) 281 *parent = al.sym; 282 if (!symbol_conf.use_callchain) 283 break; 284 syms[i].map = al.map; 285 syms[i].sym = al.sym; 286 } 287 } 288 289 return syms; 290 } 291 292 static int process_event_synth_stub(event_t *event __used, 293 struct perf_session *session __used) 294 { 295 dump_printf(": unhandled!\n"); 296 return 0; 297 } 298 299 static int process_event_stub(event_t *event __used, 300 struct sample_data *sample __used, 301 struct perf_session *session __used) 302 { 303 dump_printf(": unhandled!\n"); 304 return 0; 305 } 306 307 static int process_finished_round_stub(event_t *event __used, 308 struct perf_session *session __used, 309 struct perf_event_ops *ops __used) 310 { 311 dump_printf(": unhandled!\n"); 312 return 0; 313 } 314 315 static int process_finished_round(event_t *event, 316 struct perf_session *session, 317 struct perf_event_ops *ops); 318 319 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 320 { 321 if (handler->sample == NULL) 322 handler->sample = process_event_stub; 323 if (handler->mmap == NULL) 324 handler->mmap = process_event_stub; 325 if (handler->comm == NULL) 326 handler->comm = process_event_stub; 327 if (handler->fork == NULL) 328 handler->fork = process_event_stub; 329 if (handler->exit == NULL) 330 handler->exit = process_event_stub; 331 if (handler->lost == NULL) 332 handler->lost = event__process_lost; 333 if (handler->read == NULL) 334 handler->read = process_event_stub; 335 if (handler->throttle == NULL) 336 handler->throttle = process_event_stub; 337 if (handler->unthrottle == NULL) 338 handler->unthrottle = process_event_stub; 339 if (handler->attr == NULL) 340 handler->attr = process_event_synth_stub; 341 if (handler->event_type == NULL) 342 handler->event_type = process_event_synth_stub; 343 if (handler->tracing_data == NULL) 344 handler->tracing_data = process_event_synth_stub; 345 if (handler->build_id == NULL) 346 handler->build_id = process_event_synth_stub; 347 if (handler->finished_round == NULL) { 348 if (handler->ordered_samples) 349 handler->finished_round = process_finished_round; 350 else 351 handler->finished_round = process_finished_round_stub; 352 } 353 } 354 355 void mem_bswap_64(void *src, int byte_size) 356 { 357 u64 *m = src; 358 359 while (byte_size > 0) { 360 *m = bswap_64(*m); 361 byte_size -= sizeof(u64); 362 ++m; 363 } 364 } 365 366 static void event__all64_swap(event_t *self) 367 { 368 struct perf_event_header *hdr = &self->header; 369 mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr)); 370 } 371 372 static void event__comm_swap(event_t *self) 373 { 374 self->comm.pid = bswap_32(self->comm.pid); 375 self->comm.tid = bswap_32(self->comm.tid); 376 } 377 378 static void event__mmap_swap(event_t *self) 379 { 380 self->mmap.pid = bswap_32(self->mmap.pid); 381 self->mmap.tid = bswap_32(self->mmap.tid); 382 self->mmap.start = bswap_64(self->mmap.start); 383 self->mmap.len = bswap_64(self->mmap.len); 384 self->mmap.pgoff = bswap_64(self->mmap.pgoff); 385 } 386 387 static void event__task_swap(event_t *self) 388 { 389 self->fork.pid = bswap_32(self->fork.pid); 390 self->fork.tid = bswap_32(self->fork.tid); 391 self->fork.ppid = bswap_32(self->fork.ppid); 392 self->fork.ptid = bswap_32(self->fork.ptid); 393 self->fork.time = bswap_64(self->fork.time); 394 } 395 396 static void event__read_swap(event_t *self) 397 { 398 self->read.pid = bswap_32(self->read.pid); 399 self->read.tid = bswap_32(self->read.tid); 400 self->read.value = bswap_64(self->read.value); 401 self->read.time_enabled = bswap_64(self->read.time_enabled); 402 self->read.time_running = bswap_64(self->read.time_running); 403 self->read.id = bswap_64(self->read.id); 404 } 405 406 static void event__attr_swap(event_t *self) 407 { 408 size_t size; 409 410 self->attr.attr.type = bswap_32(self->attr.attr.type); 411 self->attr.attr.size = bswap_32(self->attr.attr.size); 412 self->attr.attr.config = bswap_64(self->attr.attr.config); 413 self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period); 414 self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type); 415 self->attr.attr.read_format = bswap_64(self->attr.attr.read_format); 416 self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events); 417 self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type); 418 self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr); 419 self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len); 420 421 size = self->header.size; 422 size -= (void *)&self->attr.id - (void *)self; 423 mem_bswap_64(self->attr.id, size); 424 } 425 426 static void event__event_type_swap(event_t *self) 427 { 428 self->event_type.event_type.event_id = 429 bswap_64(self->event_type.event_type.event_id); 430 } 431 432 static void event__tracing_data_swap(event_t *self) 433 { 434 self->tracing_data.size = bswap_32(self->tracing_data.size); 435 } 436 437 typedef void (*event__swap_op)(event_t *self); 438 439 static event__swap_op event__swap_ops[] = { 440 [PERF_RECORD_MMAP] = event__mmap_swap, 441 [PERF_RECORD_COMM] = event__comm_swap, 442 [PERF_RECORD_FORK] = event__task_swap, 443 [PERF_RECORD_EXIT] = event__task_swap, 444 [PERF_RECORD_LOST] = event__all64_swap, 445 [PERF_RECORD_READ] = event__read_swap, 446 [PERF_RECORD_SAMPLE] = event__all64_swap, 447 [PERF_RECORD_HEADER_ATTR] = event__attr_swap, 448 [PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap, 449 [PERF_RECORD_HEADER_TRACING_DATA] = event__tracing_data_swap, 450 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 451 [PERF_RECORD_HEADER_MAX] = NULL, 452 }; 453 454 struct sample_queue { 455 u64 timestamp; 456 u64 file_offset; 457 event_t *event; 458 struct list_head list; 459 }; 460 461 static void perf_session_free_sample_buffers(struct perf_session *session) 462 { 463 struct ordered_samples *os = &session->ordered_samples; 464 465 while (!list_empty(&os->to_free)) { 466 struct sample_queue *sq; 467 468 sq = list_entry(os->to_free.next, struct sample_queue, list); 469 list_del(&sq->list); 470 free(sq); 471 } 472 } 473 474 static int perf_session_deliver_event(struct perf_session *session, 475 event_t *event, 476 struct sample_data *sample, 477 struct perf_event_ops *ops, 478 u64 file_offset); 479 480 static void flush_sample_queue(struct perf_session *s, 481 struct perf_event_ops *ops) 482 { 483 struct ordered_samples *os = &s->ordered_samples; 484 struct list_head *head = &os->samples; 485 struct sample_queue *tmp, *iter; 486 struct sample_data sample; 487 u64 limit = os->next_flush; 488 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 489 490 if (!ops->ordered_samples || !limit) 491 return; 492 493 list_for_each_entry_safe(iter, tmp, head, list) { 494 if (iter->timestamp > limit) 495 break; 496 497 event__parse_sample(iter->event, s, &sample); 498 perf_session_deliver_event(s, iter->event, &sample, ops, 499 iter->file_offset); 500 501 os->last_flush = iter->timestamp; 502 list_del(&iter->list); 503 list_add(&iter->list, &os->sample_cache); 504 } 505 506 if (list_empty(head)) { 507 os->last_sample = NULL; 508 } else if (last_ts <= limit) { 509 os->last_sample = 510 list_entry(head->prev, struct sample_queue, list); 511 } 512 } 513 514 /* 515 * When perf record finishes a pass on every buffers, it records this pseudo 516 * event. 517 * We record the max timestamp t found in the pass n. 518 * Assuming these timestamps are monotonic across cpus, we know that if 519 * a buffer still has events with timestamps below t, they will be all 520 * available and then read in the pass n + 1. 521 * Hence when we start to read the pass n + 2, we can safely flush every 522 * events with timestamps below t. 523 * 524 * ============ PASS n ================= 525 * CPU 0 | CPU 1 526 * | 527 * cnt1 timestamps | cnt2 timestamps 528 * 1 | 2 529 * 2 | 3 530 * - | 4 <--- max recorded 531 * 532 * ============ PASS n + 1 ============== 533 * CPU 0 | CPU 1 534 * | 535 * cnt1 timestamps | cnt2 timestamps 536 * 3 | 5 537 * 4 | 6 538 * 5 | 7 <---- max recorded 539 * 540 * Flush every events below timestamp 4 541 * 542 * ============ PASS n + 2 ============== 543 * CPU 0 | CPU 1 544 * | 545 * cnt1 timestamps | cnt2 timestamps 546 * 6 | 8 547 * 7 | 9 548 * - | 10 549 * 550 * Flush every events below timestamp 7 551 * etc... 552 */ 553 static int process_finished_round(event_t *event __used, 554 struct perf_session *session, 555 struct perf_event_ops *ops) 556 { 557 flush_sample_queue(session, ops); 558 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 559 560 return 0; 561 } 562 563 /* The queue is ordered by time */ 564 static void __queue_event(struct sample_queue *new, struct perf_session *s) 565 { 566 struct ordered_samples *os = &s->ordered_samples; 567 struct sample_queue *sample = os->last_sample; 568 u64 timestamp = new->timestamp; 569 struct list_head *p; 570 571 os->last_sample = new; 572 573 if (!sample) { 574 list_add(&new->list, &os->samples); 575 os->max_timestamp = timestamp; 576 return; 577 } 578 579 /* 580 * last_sample might point to some random place in the list as it's 581 * the last queued event. We expect that the new event is close to 582 * this. 583 */ 584 if (sample->timestamp <= timestamp) { 585 while (sample->timestamp <= timestamp) { 586 p = sample->list.next; 587 if (p == &os->samples) { 588 list_add_tail(&new->list, &os->samples); 589 os->max_timestamp = timestamp; 590 return; 591 } 592 sample = list_entry(p, struct sample_queue, list); 593 } 594 list_add_tail(&new->list, &sample->list); 595 } else { 596 while (sample->timestamp > timestamp) { 597 p = sample->list.prev; 598 if (p == &os->samples) { 599 list_add(&new->list, &os->samples); 600 return; 601 } 602 sample = list_entry(p, struct sample_queue, list); 603 } 604 list_add(&new->list, &sample->list); 605 } 606 } 607 608 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 609 610 static int perf_session_queue_event(struct perf_session *s, event_t *event, 611 struct sample_data *data, u64 file_offset) 612 { 613 struct ordered_samples *os = &s->ordered_samples; 614 struct list_head *sc = &os->sample_cache; 615 u64 timestamp = data->time; 616 struct sample_queue *new; 617 618 if (!timestamp || timestamp == ~0ULL) 619 return -ETIME; 620 621 if (timestamp < s->ordered_samples.last_flush) { 622 printf("Warning: Timestamp below last timeslice flush\n"); 623 return -EINVAL; 624 } 625 626 if (!list_empty(sc)) { 627 new = list_entry(sc->next, struct sample_queue, list); 628 list_del(&new->list); 629 } else if (os->sample_buffer) { 630 new = os->sample_buffer + os->sample_buffer_idx; 631 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 632 os->sample_buffer = NULL; 633 } else { 634 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 635 if (!os->sample_buffer) 636 return -ENOMEM; 637 list_add(&os->sample_buffer->list, &os->to_free); 638 os->sample_buffer_idx = 2; 639 new = os->sample_buffer + 1; 640 } 641 642 new->timestamp = timestamp; 643 new->file_offset = file_offset; 644 new->event = event; 645 646 __queue_event(new, s); 647 648 return 0; 649 } 650 651 static void callchain__printf(struct sample_data *sample) 652 { 653 unsigned int i; 654 655 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 656 657 for (i = 0; i < sample->callchain->nr; i++) 658 printf("..... %2d: %016" PRIx64 "\n", 659 i, sample->callchain->ips[i]); 660 } 661 662 static void perf_session__print_tstamp(struct perf_session *session, 663 event_t *event, 664 struct sample_data *sample) 665 { 666 if (event->header.type != PERF_RECORD_SAMPLE && 667 !session->sample_id_all) { 668 fputs("-1 -1 ", stdout); 669 return; 670 } 671 672 if ((session->sample_type & PERF_SAMPLE_CPU)) 673 printf("%u ", sample->cpu); 674 675 if (session->sample_type & PERF_SAMPLE_TIME) 676 printf("%" PRIu64 " ", sample->time); 677 } 678 679 static void dump_event(struct perf_session *session, event_t *event, 680 u64 file_offset, struct sample_data *sample) 681 { 682 if (!dump_trace) 683 return; 684 685 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 686 file_offset, event->header.size, event->header.type); 687 688 trace_event(event); 689 690 if (sample) 691 perf_session__print_tstamp(session, event, sample); 692 693 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 694 event->header.size, event__get_event_name(event->header.type)); 695 } 696 697 static void dump_sample(struct perf_session *session, event_t *event, 698 struct sample_data *sample) 699 { 700 if (!dump_trace) 701 return; 702 703 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n", 704 event->header.misc, sample->pid, sample->tid, sample->ip, 705 sample->period); 706 707 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 708 callchain__printf(sample); 709 } 710 711 static int perf_session_deliver_event(struct perf_session *session, 712 event_t *event, 713 struct sample_data *sample, 714 struct perf_event_ops *ops, 715 u64 file_offset) 716 { 717 dump_event(session, event, file_offset, sample); 718 719 switch (event->header.type) { 720 case PERF_RECORD_SAMPLE: 721 dump_sample(session, event, sample); 722 return ops->sample(event, sample, session); 723 case PERF_RECORD_MMAP: 724 return ops->mmap(event, sample, session); 725 case PERF_RECORD_COMM: 726 return ops->comm(event, sample, session); 727 case PERF_RECORD_FORK: 728 return ops->fork(event, sample, session); 729 case PERF_RECORD_EXIT: 730 return ops->exit(event, sample, session); 731 case PERF_RECORD_LOST: 732 return ops->lost(event, sample, session); 733 case PERF_RECORD_READ: 734 return ops->read(event, sample, session); 735 case PERF_RECORD_THROTTLE: 736 return ops->throttle(event, sample, session); 737 case PERF_RECORD_UNTHROTTLE: 738 return ops->unthrottle(event, sample, session); 739 default: 740 ++session->hists.stats.nr_unknown_events; 741 return -1; 742 } 743 } 744 745 static int perf_session__preprocess_sample(struct perf_session *session, 746 event_t *event, struct sample_data *sample) 747 { 748 if (event->header.type != PERF_RECORD_SAMPLE || 749 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 750 return 0; 751 752 if (!ip_callchain__valid(sample->callchain, event)) { 753 pr_debug("call-chain problem with event, skipping it.\n"); 754 ++session->hists.stats.nr_invalid_chains; 755 session->hists.stats.total_invalid_chains += sample->period; 756 return -EINVAL; 757 } 758 return 0; 759 } 760 761 static int perf_session__process_user_event(struct perf_session *session, event_t *event, 762 struct perf_event_ops *ops, u64 file_offset) 763 { 764 dump_event(session, event, file_offset, NULL); 765 766 /* These events are processed right away */ 767 switch (event->header.type) { 768 case PERF_RECORD_HEADER_ATTR: 769 return ops->attr(event, session); 770 case PERF_RECORD_HEADER_EVENT_TYPE: 771 return ops->event_type(event, session); 772 case PERF_RECORD_HEADER_TRACING_DATA: 773 /* setup for reading amidst mmap */ 774 lseek(session->fd, file_offset, SEEK_SET); 775 return ops->tracing_data(event, session); 776 case PERF_RECORD_HEADER_BUILD_ID: 777 return ops->build_id(event, session); 778 case PERF_RECORD_FINISHED_ROUND: 779 return ops->finished_round(event, session, ops); 780 default: 781 return -EINVAL; 782 } 783 } 784 785 static int perf_session__process_event(struct perf_session *session, 786 event_t *event, 787 struct perf_event_ops *ops, 788 u64 file_offset) 789 { 790 struct sample_data sample; 791 int ret; 792 793 if (session->header.needs_swap && event__swap_ops[event->header.type]) 794 event__swap_ops[event->header.type](event); 795 796 if (event->header.type >= PERF_RECORD_HEADER_MAX) 797 return -EINVAL; 798 799 hists__inc_nr_events(&session->hists, event->header.type); 800 801 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 802 return perf_session__process_user_event(session, event, ops, file_offset); 803 804 /* 805 * For all kernel events we get the sample data 806 */ 807 event__parse_sample(event, session, &sample); 808 809 /* Preprocess sample records - precheck callchains */ 810 if (perf_session__preprocess_sample(session, event, &sample)) 811 return 0; 812 813 if (ops->ordered_samples) { 814 ret = perf_session_queue_event(session, event, &sample, 815 file_offset); 816 if (ret != -ETIME) 817 return ret; 818 } 819 820 return perf_session_deliver_event(session, event, &sample, ops, 821 file_offset); 822 } 823 824 void perf_event_header__bswap(struct perf_event_header *self) 825 { 826 self->type = bswap_32(self->type); 827 self->misc = bswap_16(self->misc); 828 self->size = bswap_16(self->size); 829 } 830 831 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 832 { 833 struct thread *thread = perf_session__findnew(self, 0); 834 835 if (thread == NULL || thread__set_comm(thread, "swapper")) { 836 pr_err("problem inserting idle task.\n"); 837 thread = NULL; 838 } 839 840 return thread; 841 } 842 843 static void perf_session__warn_about_errors(const struct perf_session *session, 844 const struct perf_event_ops *ops) 845 { 846 if (ops->lost == event__process_lost && 847 session->hists.stats.total_lost != 0) { 848 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64 849 "!\n\nCheck IO/CPU overload!\n\n", 850 session->hists.stats.total_period, 851 session->hists.stats.total_lost); 852 } 853 854 if (session->hists.stats.nr_unknown_events != 0) { 855 ui__warning("Found %u unknown events!\n\n" 856 "Is this an older tool processing a perf.data " 857 "file generated by a more recent tool?\n\n" 858 "If that is not the case, consider " 859 "reporting to linux-kernel@vger.kernel.org.\n\n", 860 session->hists.stats.nr_unknown_events); 861 } 862 863 if (session->hists.stats.nr_invalid_chains != 0) { 864 ui__warning("Found invalid callchains!\n\n" 865 "%u out of %u events were discarded for this reason.\n\n" 866 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 867 session->hists.stats.nr_invalid_chains, 868 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 869 } 870 } 871 872 #define session_done() (*(volatile int *)(&session_done)) 873 volatile int session_done; 874 875 static int __perf_session__process_pipe_events(struct perf_session *self, 876 struct perf_event_ops *ops) 877 { 878 event_t event; 879 uint32_t size; 880 int skip = 0; 881 u64 head; 882 int err; 883 void *p; 884 885 perf_event_ops__fill_defaults(ops); 886 887 head = 0; 888 more: 889 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 890 if (err <= 0) { 891 if (err == 0) 892 goto done; 893 894 pr_err("failed to read event header\n"); 895 goto out_err; 896 } 897 898 if (self->header.needs_swap) 899 perf_event_header__bswap(&event.header); 900 901 size = event.header.size; 902 if (size == 0) 903 size = 8; 904 905 p = &event; 906 p += sizeof(struct perf_event_header); 907 908 if (size - sizeof(struct perf_event_header)) { 909 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 910 if (err <= 0) { 911 if (err == 0) { 912 pr_err("unexpected end of event stream\n"); 913 goto done; 914 } 915 916 pr_err("failed to read event data\n"); 917 goto out_err; 918 } 919 } 920 921 if (size == 0 || 922 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 923 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 924 head, event.header.size, event.header.type); 925 /* 926 * assume we lost track of the stream, check alignment, and 927 * increment a single u64 in the hope to catch on again 'soon'. 928 */ 929 if (unlikely(head & 7)) 930 head &= ~7ULL; 931 932 size = 8; 933 } 934 935 head += size; 936 937 if (skip > 0) 938 head += skip; 939 940 if (!session_done()) 941 goto more; 942 done: 943 err = 0; 944 out_err: 945 perf_session__warn_about_errors(self, ops); 946 perf_session_free_sample_buffers(self); 947 return err; 948 } 949 950 int __perf_session__process_events(struct perf_session *session, 951 u64 data_offset, u64 data_size, 952 u64 file_size, struct perf_event_ops *ops) 953 { 954 u64 head, page_offset, file_offset, file_pos, progress_next; 955 int err, mmap_prot, mmap_flags, map_idx = 0; 956 struct ui_progress *progress; 957 size_t page_size, mmap_size; 958 char *buf, *mmaps[8]; 959 event_t *event; 960 uint32_t size; 961 962 perf_event_ops__fill_defaults(ops); 963 964 page_size = sysconf(_SC_PAGESIZE); 965 966 page_offset = page_size * (data_offset / page_size); 967 file_offset = page_offset; 968 head = data_offset - page_offset; 969 970 if (data_offset + data_size < file_size) 971 file_size = data_offset + data_size; 972 973 progress_next = file_size / 16; 974 progress = ui_progress__new("Processing events...", file_size); 975 if (progress == NULL) 976 return -1; 977 978 mmap_size = session->mmap_window; 979 if (mmap_size > file_size) 980 mmap_size = file_size; 981 982 memset(mmaps, 0, sizeof(mmaps)); 983 984 mmap_prot = PROT_READ; 985 mmap_flags = MAP_SHARED; 986 987 if (session->header.needs_swap) { 988 mmap_prot |= PROT_WRITE; 989 mmap_flags = MAP_PRIVATE; 990 } 991 remap: 992 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 993 file_offset); 994 if (buf == MAP_FAILED) { 995 pr_err("failed to mmap file\n"); 996 err = -errno; 997 goto out_err; 998 } 999 mmaps[map_idx] = buf; 1000 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1001 file_pos = file_offset + head; 1002 1003 more: 1004 event = (event_t *)(buf + head); 1005 1006 if (session->header.needs_swap) 1007 perf_event_header__bswap(&event->header); 1008 size = event->header.size; 1009 if (size == 0) 1010 size = 8; 1011 1012 if (head + event->header.size > mmap_size) { 1013 if (mmaps[map_idx]) { 1014 munmap(mmaps[map_idx], mmap_size); 1015 mmaps[map_idx] = NULL; 1016 } 1017 1018 page_offset = page_size * (head / page_size); 1019 file_offset += page_offset; 1020 head -= page_offset; 1021 goto remap; 1022 } 1023 1024 size = event->header.size; 1025 1026 if (size == 0 || 1027 perf_session__process_event(session, event, ops, file_pos) < 0) { 1028 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1029 file_offset + head, event->header.size, 1030 event->header.type); 1031 /* 1032 * assume we lost track of the stream, check alignment, and 1033 * increment a single u64 in the hope to catch on again 'soon'. 1034 */ 1035 if (unlikely(head & 7)) 1036 head &= ~7ULL; 1037 1038 size = 8; 1039 } 1040 1041 head += size; 1042 file_pos += size; 1043 1044 if (file_pos >= progress_next) { 1045 progress_next += file_size / 16; 1046 ui_progress__update(progress, file_pos); 1047 } 1048 1049 if (file_pos < file_size) 1050 goto more; 1051 1052 err = 0; 1053 /* do the final flush for ordered samples */ 1054 session->ordered_samples.next_flush = ULLONG_MAX; 1055 flush_sample_queue(session, ops); 1056 out_err: 1057 ui_progress__delete(progress); 1058 perf_session__warn_about_errors(session, ops); 1059 perf_session_free_sample_buffers(session); 1060 return err; 1061 } 1062 1063 int perf_session__process_events(struct perf_session *self, 1064 struct perf_event_ops *ops) 1065 { 1066 int err; 1067 1068 if (perf_session__register_idle_thread(self) == NULL) 1069 return -ENOMEM; 1070 1071 if (!self->fd_pipe) 1072 err = __perf_session__process_events(self, 1073 self->header.data_offset, 1074 self->header.data_size, 1075 self->size, ops); 1076 else 1077 err = __perf_session__process_pipe_events(self, ops); 1078 1079 return err; 1080 } 1081 1082 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1083 { 1084 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1085 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1086 return false; 1087 } 1088 1089 return true; 1090 } 1091 1092 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1093 const char *symbol_name, 1094 u64 addr) 1095 { 1096 char *bracket; 1097 enum map_type i; 1098 struct ref_reloc_sym *ref; 1099 1100 ref = zalloc(sizeof(struct ref_reloc_sym)); 1101 if (ref == NULL) 1102 return -ENOMEM; 1103 1104 ref->name = strdup(symbol_name); 1105 if (ref->name == NULL) { 1106 free(ref); 1107 return -ENOMEM; 1108 } 1109 1110 bracket = strchr(ref->name, ']'); 1111 if (bracket) 1112 *bracket = '\0'; 1113 1114 ref->addr = addr; 1115 1116 for (i = 0; i < MAP__NR_TYPES; ++i) { 1117 struct kmap *kmap = map__kmap(maps[i]); 1118 kmap->ref_reloc_sym = ref; 1119 } 1120 1121 return 0; 1122 } 1123 1124 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1125 { 1126 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1127 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1128 machines__fprintf_dsos(&self->machines, fp); 1129 } 1130 1131 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1132 bool with_hits) 1133 { 1134 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1135 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1136 } 1137