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 "evlist.h" 11 #include "evsel.h" 12 #include "session.h" 13 #include "sort.h" 14 #include "util.h" 15 #include "cpumap.h" 16 17 static int perf_session__open(struct perf_session *self, bool force) 18 { 19 struct stat input_stat; 20 21 if (!strcmp(self->filename, "-")) { 22 self->fd_pipe = true; 23 self->fd = STDIN_FILENO; 24 25 if (perf_session__read_header(self, self->fd) < 0) 26 pr_err("incompatible file format"); 27 28 return 0; 29 } 30 31 self->fd = open(self->filename, O_RDONLY); 32 if (self->fd < 0) { 33 int err = errno; 34 35 pr_err("failed to open %s: %s", self->filename, strerror(err)); 36 if (err == ENOENT && !strcmp(self->filename, "perf.data")) 37 pr_err(" (try 'perf record' first)"); 38 pr_err("\n"); 39 return -errno; 40 } 41 42 if (fstat(self->fd, &input_stat) < 0) 43 goto out_close; 44 45 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 46 pr_err("file %s not owned by current user or root\n", 47 self->filename); 48 goto out_close; 49 } 50 51 if (!input_stat.st_size) { 52 pr_info("zero-sized file (%s), nothing to do!\n", 53 self->filename); 54 goto out_close; 55 } 56 57 if (perf_session__read_header(self, self->fd) < 0) { 58 pr_err("incompatible file format"); 59 goto out_close; 60 } 61 62 if (!perf_evlist__valid_sample_type(self->evlist)) { 63 pr_err("non matching sample_type"); 64 goto out_close; 65 } 66 67 if (!perf_evlist__valid_sample_id_all(self->evlist)) { 68 pr_err("non matching sample_id_all"); 69 goto out_close; 70 } 71 72 self->size = input_stat.st_size; 73 return 0; 74 75 out_close: 76 close(self->fd); 77 self->fd = -1; 78 return -1; 79 } 80 81 void perf_session__update_sample_type(struct perf_session *self) 82 { 83 self->sample_type = perf_evlist__sample_type(self->evlist); 84 self->sample_size = __perf_evsel__sample_size(self->sample_type); 85 self->sample_id_all = perf_evlist__sample_id_all(self->evlist); 86 self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist); 87 } 88 89 int perf_session__create_kernel_maps(struct perf_session *self) 90 { 91 int ret = machine__create_kernel_maps(&self->host_machine); 92 93 if (ret >= 0) 94 ret = machines__create_guest_kernel_maps(&self->machines); 95 return ret; 96 } 97 98 static void perf_session__destroy_kernel_maps(struct perf_session *self) 99 { 100 machine__destroy_kernel_maps(&self->host_machine); 101 machines__destroy_guest_kernel_maps(&self->machines); 102 } 103 104 struct perf_session *perf_session__new(const char *filename, int mode, 105 bool force, bool repipe, 106 struct perf_event_ops *ops) 107 { 108 size_t len = filename ? strlen(filename) + 1 : 0; 109 struct perf_session *self = zalloc(sizeof(*self) + len); 110 111 if (self == NULL) 112 goto out; 113 114 memcpy(self->filename, filename, len); 115 /* 116 * On 64bit we can mmap the data file in one go. No need for tiny mmap 117 * slices. On 32bit we use 32MB. 118 */ 119 #if BITS_PER_LONG == 64 120 self->mmap_window = ULLONG_MAX; 121 #else 122 self->mmap_window = 32 * 1024 * 1024ULL; 123 #endif 124 self->machines = RB_ROOT; 125 self->repipe = repipe; 126 INIT_LIST_HEAD(&self->ordered_samples.samples); 127 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 128 INIT_LIST_HEAD(&self->ordered_samples.to_free); 129 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 130 131 if (mode == O_RDONLY) { 132 if (perf_session__open(self, force) < 0) 133 goto out_delete; 134 perf_session__update_sample_type(self); 135 } else if (mode == O_WRONLY) { 136 /* 137 * In O_RDONLY mode this will be performed when reading the 138 * kernel MMAP event, in perf_event__process_mmap(). 139 */ 140 if (perf_session__create_kernel_maps(self) < 0) 141 goto out_delete; 142 } 143 144 if (ops && ops->ordering_requires_timestamps && 145 ops->ordered_samples && !self->sample_id_all) { 146 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 147 ops->ordered_samples = false; 148 } 149 150 out: 151 return self; 152 out_delete: 153 perf_session__delete(self); 154 return NULL; 155 } 156 157 static void machine__delete_dead_threads(struct machine *machine) 158 { 159 struct thread *n, *t; 160 161 list_for_each_entry_safe(t, n, &machine->dead_threads, node) { 162 list_del(&t->node); 163 thread__delete(t); 164 } 165 } 166 167 static void perf_session__delete_dead_threads(struct perf_session *session) 168 { 169 machine__delete_dead_threads(&session->host_machine); 170 } 171 172 static void machine__delete_threads(struct machine *self) 173 { 174 struct rb_node *nd = rb_first(&self->threads); 175 176 while (nd) { 177 struct thread *t = rb_entry(nd, struct thread, rb_node); 178 179 rb_erase(&t->rb_node, &self->threads); 180 nd = rb_next(nd); 181 thread__delete(t); 182 } 183 } 184 185 static void perf_session__delete_threads(struct perf_session *session) 186 { 187 machine__delete_threads(&session->host_machine); 188 } 189 190 void perf_session__delete(struct perf_session *self) 191 { 192 perf_session__destroy_kernel_maps(self); 193 perf_session__delete_dead_threads(self); 194 perf_session__delete_threads(self); 195 machine__exit(&self->host_machine); 196 close(self->fd); 197 free(self); 198 } 199 200 void machine__remove_thread(struct machine *self, struct thread *th) 201 { 202 self->last_match = NULL; 203 rb_erase(&th->rb_node, &self->threads); 204 /* 205 * We may have references to this thread, for instance in some hist_entry 206 * instances, so just move them to a separate list. 207 */ 208 list_add_tail(&th->node, &self->dead_threads); 209 } 210 211 static bool symbol__match_parent_regex(struct symbol *sym) 212 { 213 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 214 return 1; 215 216 return 0; 217 } 218 219 int perf_session__resolve_callchain(struct perf_session *self, 220 struct thread *thread, 221 struct ip_callchain *chain, 222 struct symbol **parent) 223 { 224 u8 cpumode = PERF_RECORD_MISC_USER; 225 unsigned int i; 226 int err; 227 228 callchain_cursor_reset(&self->callchain_cursor); 229 230 for (i = 0; i < chain->nr; i++) { 231 u64 ip; 232 struct addr_location al; 233 234 if (callchain_param.order == ORDER_CALLEE) 235 ip = chain->ips[i]; 236 else 237 ip = chain->ips[chain->nr - i - 1]; 238 239 if (ip >= PERF_CONTEXT_MAX) { 240 switch (ip) { 241 case PERF_CONTEXT_HV: 242 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 243 case PERF_CONTEXT_KERNEL: 244 cpumode = PERF_RECORD_MISC_KERNEL; break; 245 case PERF_CONTEXT_USER: 246 cpumode = PERF_RECORD_MISC_USER; break; 247 default: 248 break; 249 } 250 continue; 251 } 252 253 al.filtered = false; 254 thread__find_addr_location(thread, self, cpumode, 255 MAP__FUNCTION, thread->pid, ip, &al, NULL); 256 if (al.sym != NULL) { 257 if (sort__has_parent && !*parent && 258 symbol__match_parent_regex(al.sym)) 259 *parent = al.sym; 260 if (!symbol_conf.use_callchain) 261 break; 262 } 263 264 err = callchain_cursor_append(&self->callchain_cursor, 265 ip, al.map, al.sym); 266 if (err) 267 return err; 268 } 269 270 return 0; 271 } 272 273 static int process_event_synth_stub(union perf_event *event __used, 274 struct perf_session *session __used) 275 { 276 dump_printf(": unhandled!\n"); 277 return 0; 278 } 279 280 static int process_event_sample_stub(union perf_event *event __used, 281 struct perf_sample *sample __used, 282 struct perf_evsel *evsel __used, 283 struct perf_session *session __used) 284 { 285 dump_printf(": unhandled!\n"); 286 return 0; 287 } 288 289 static int process_event_stub(union perf_event *event __used, 290 struct perf_sample *sample __used, 291 struct perf_session *session __used) 292 { 293 dump_printf(": unhandled!\n"); 294 return 0; 295 } 296 297 static int process_finished_round_stub(union perf_event *event __used, 298 struct perf_session *session __used, 299 struct perf_event_ops *ops __used) 300 { 301 dump_printf(": unhandled!\n"); 302 return 0; 303 } 304 305 static int process_finished_round(union perf_event *event, 306 struct perf_session *session, 307 struct perf_event_ops *ops); 308 309 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 310 { 311 if (handler->sample == NULL) 312 handler->sample = process_event_sample_stub; 313 if (handler->mmap == NULL) 314 handler->mmap = process_event_stub; 315 if (handler->comm == NULL) 316 handler->comm = process_event_stub; 317 if (handler->fork == NULL) 318 handler->fork = process_event_stub; 319 if (handler->exit == NULL) 320 handler->exit = process_event_stub; 321 if (handler->lost == NULL) 322 handler->lost = perf_event__process_lost; 323 if (handler->read == NULL) 324 handler->read = process_event_stub; 325 if (handler->throttle == NULL) 326 handler->throttle = process_event_stub; 327 if (handler->unthrottle == NULL) 328 handler->unthrottle = process_event_stub; 329 if (handler->attr == NULL) 330 handler->attr = process_event_synth_stub; 331 if (handler->event_type == NULL) 332 handler->event_type = process_event_synth_stub; 333 if (handler->tracing_data == NULL) 334 handler->tracing_data = process_event_synth_stub; 335 if (handler->build_id == NULL) 336 handler->build_id = process_event_synth_stub; 337 if (handler->finished_round == NULL) { 338 if (handler->ordered_samples) 339 handler->finished_round = process_finished_round; 340 else 341 handler->finished_round = process_finished_round_stub; 342 } 343 } 344 345 void mem_bswap_64(void *src, int byte_size) 346 { 347 u64 *m = src; 348 349 while (byte_size > 0) { 350 *m = bswap_64(*m); 351 byte_size -= sizeof(u64); 352 ++m; 353 } 354 } 355 356 static void perf_event__all64_swap(union perf_event *event) 357 { 358 struct perf_event_header *hdr = &event->header; 359 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 360 } 361 362 static void perf_event__comm_swap(union perf_event *event) 363 { 364 event->comm.pid = bswap_32(event->comm.pid); 365 event->comm.tid = bswap_32(event->comm.tid); 366 } 367 368 static void perf_event__mmap_swap(union perf_event *event) 369 { 370 event->mmap.pid = bswap_32(event->mmap.pid); 371 event->mmap.tid = bswap_32(event->mmap.tid); 372 event->mmap.start = bswap_64(event->mmap.start); 373 event->mmap.len = bswap_64(event->mmap.len); 374 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 375 } 376 377 static void perf_event__task_swap(union perf_event *event) 378 { 379 event->fork.pid = bswap_32(event->fork.pid); 380 event->fork.tid = bswap_32(event->fork.tid); 381 event->fork.ppid = bswap_32(event->fork.ppid); 382 event->fork.ptid = bswap_32(event->fork.ptid); 383 event->fork.time = bswap_64(event->fork.time); 384 } 385 386 static void perf_event__read_swap(union perf_event *event) 387 { 388 event->read.pid = bswap_32(event->read.pid); 389 event->read.tid = bswap_32(event->read.tid); 390 event->read.value = bswap_64(event->read.value); 391 event->read.time_enabled = bswap_64(event->read.time_enabled); 392 event->read.time_running = bswap_64(event->read.time_running); 393 event->read.id = bswap_64(event->read.id); 394 } 395 396 /* exported for swapping attributes in file header */ 397 void perf_event__attr_swap(struct perf_event_attr *attr) 398 { 399 attr->type = bswap_32(attr->type); 400 attr->size = bswap_32(attr->size); 401 attr->config = bswap_64(attr->config); 402 attr->sample_period = bswap_64(attr->sample_period); 403 attr->sample_type = bswap_64(attr->sample_type); 404 attr->read_format = bswap_64(attr->read_format); 405 attr->wakeup_events = bswap_32(attr->wakeup_events); 406 attr->bp_type = bswap_32(attr->bp_type); 407 attr->bp_addr = bswap_64(attr->bp_addr); 408 attr->bp_len = bswap_64(attr->bp_len); 409 } 410 411 static void perf_event__hdr_attr_swap(union perf_event *event) 412 { 413 size_t size; 414 415 perf_event__attr_swap(&event->attr.attr); 416 417 size = event->header.size; 418 size -= (void *)&event->attr.id - (void *)event; 419 mem_bswap_64(event->attr.id, size); 420 } 421 422 static void perf_event__event_type_swap(union perf_event *event) 423 { 424 event->event_type.event_type.event_id = 425 bswap_64(event->event_type.event_type.event_id); 426 } 427 428 static void perf_event__tracing_data_swap(union perf_event *event) 429 { 430 event->tracing_data.size = bswap_32(event->tracing_data.size); 431 } 432 433 typedef void (*perf_event__swap_op)(union perf_event *event); 434 435 static perf_event__swap_op perf_event__swap_ops[] = { 436 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 437 [PERF_RECORD_COMM] = perf_event__comm_swap, 438 [PERF_RECORD_FORK] = perf_event__task_swap, 439 [PERF_RECORD_EXIT] = perf_event__task_swap, 440 [PERF_RECORD_LOST] = perf_event__all64_swap, 441 [PERF_RECORD_READ] = perf_event__read_swap, 442 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 443 [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, 444 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 445 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 446 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 447 [PERF_RECORD_HEADER_MAX] = NULL, 448 }; 449 450 struct sample_queue { 451 u64 timestamp; 452 u64 file_offset; 453 union perf_event *event; 454 struct list_head list; 455 }; 456 457 static void perf_session_free_sample_buffers(struct perf_session *session) 458 { 459 struct ordered_samples *os = &session->ordered_samples; 460 461 while (!list_empty(&os->to_free)) { 462 struct sample_queue *sq; 463 464 sq = list_entry(os->to_free.next, struct sample_queue, list); 465 list_del(&sq->list); 466 free(sq); 467 } 468 } 469 470 static int perf_session_deliver_event(struct perf_session *session, 471 union perf_event *event, 472 struct perf_sample *sample, 473 struct perf_event_ops *ops, 474 u64 file_offset); 475 476 static void flush_sample_queue(struct perf_session *s, 477 struct perf_event_ops *ops) 478 { 479 struct ordered_samples *os = &s->ordered_samples; 480 struct list_head *head = &os->samples; 481 struct sample_queue *tmp, *iter; 482 struct perf_sample sample; 483 u64 limit = os->next_flush; 484 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 485 unsigned idx = 0, progress_next = os->nr_samples / 16; 486 int ret; 487 488 if (!ops->ordered_samples || !limit) 489 return; 490 491 list_for_each_entry_safe(iter, tmp, head, list) { 492 if (iter->timestamp > limit) 493 break; 494 495 ret = perf_session__parse_sample(s, iter->event, &sample); 496 if (ret) 497 pr_err("Can't parse sample, err = %d\n", ret); 498 else 499 perf_session_deliver_event(s, iter->event, &sample, ops, 500 iter->file_offset); 501 502 os->last_flush = iter->timestamp; 503 list_del(&iter->list); 504 list_add(&iter->list, &os->sample_cache); 505 if (++idx >= progress_next) { 506 progress_next += os->nr_samples / 16; 507 ui_progress__update(idx, os->nr_samples, 508 "Processing time ordered events..."); 509 } 510 } 511 512 if (list_empty(head)) { 513 os->last_sample = NULL; 514 } else if (last_ts <= limit) { 515 os->last_sample = 516 list_entry(head->prev, struct sample_queue, list); 517 } 518 519 os->nr_samples = 0; 520 } 521 522 /* 523 * When perf record finishes a pass on every buffers, it records this pseudo 524 * event. 525 * We record the max timestamp t found in the pass n. 526 * Assuming these timestamps are monotonic across cpus, we know that if 527 * a buffer still has events with timestamps below t, they will be all 528 * available and then read in the pass n + 1. 529 * Hence when we start to read the pass n + 2, we can safely flush every 530 * events with timestamps below t. 531 * 532 * ============ PASS n ================= 533 * CPU 0 | CPU 1 534 * | 535 * cnt1 timestamps | cnt2 timestamps 536 * 1 | 2 537 * 2 | 3 538 * - | 4 <--- max recorded 539 * 540 * ============ PASS n + 1 ============== 541 * CPU 0 | CPU 1 542 * | 543 * cnt1 timestamps | cnt2 timestamps 544 * 3 | 5 545 * 4 | 6 546 * 5 | 7 <---- max recorded 547 * 548 * Flush every events below timestamp 4 549 * 550 * ============ PASS n + 2 ============== 551 * CPU 0 | CPU 1 552 * | 553 * cnt1 timestamps | cnt2 timestamps 554 * 6 | 8 555 * 7 | 9 556 * - | 10 557 * 558 * Flush every events below timestamp 7 559 * etc... 560 */ 561 static int process_finished_round(union perf_event *event __used, 562 struct perf_session *session, 563 struct perf_event_ops *ops) 564 { 565 flush_sample_queue(session, ops); 566 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 567 568 return 0; 569 } 570 571 /* The queue is ordered by time */ 572 static void __queue_event(struct sample_queue *new, struct perf_session *s) 573 { 574 struct ordered_samples *os = &s->ordered_samples; 575 struct sample_queue *sample = os->last_sample; 576 u64 timestamp = new->timestamp; 577 struct list_head *p; 578 579 ++os->nr_samples; 580 os->last_sample = new; 581 582 if (!sample) { 583 list_add(&new->list, &os->samples); 584 os->max_timestamp = timestamp; 585 return; 586 } 587 588 /* 589 * last_sample might point to some random place in the list as it's 590 * the last queued event. We expect that the new event is close to 591 * this. 592 */ 593 if (sample->timestamp <= timestamp) { 594 while (sample->timestamp <= timestamp) { 595 p = sample->list.next; 596 if (p == &os->samples) { 597 list_add_tail(&new->list, &os->samples); 598 os->max_timestamp = timestamp; 599 return; 600 } 601 sample = list_entry(p, struct sample_queue, list); 602 } 603 list_add_tail(&new->list, &sample->list); 604 } else { 605 while (sample->timestamp > timestamp) { 606 p = sample->list.prev; 607 if (p == &os->samples) { 608 list_add(&new->list, &os->samples); 609 return; 610 } 611 sample = list_entry(p, struct sample_queue, list); 612 } 613 list_add(&new->list, &sample->list); 614 } 615 } 616 617 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 618 619 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 620 struct perf_sample *sample, u64 file_offset) 621 { 622 struct ordered_samples *os = &s->ordered_samples; 623 struct list_head *sc = &os->sample_cache; 624 u64 timestamp = sample->time; 625 struct sample_queue *new; 626 627 if (!timestamp || timestamp == ~0ULL) 628 return -ETIME; 629 630 if (timestamp < s->ordered_samples.last_flush) { 631 printf("Warning: Timestamp below last timeslice flush\n"); 632 return -EINVAL; 633 } 634 635 if (!list_empty(sc)) { 636 new = list_entry(sc->next, struct sample_queue, list); 637 list_del(&new->list); 638 } else if (os->sample_buffer) { 639 new = os->sample_buffer + os->sample_buffer_idx; 640 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 641 os->sample_buffer = NULL; 642 } else { 643 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 644 if (!os->sample_buffer) 645 return -ENOMEM; 646 list_add(&os->sample_buffer->list, &os->to_free); 647 os->sample_buffer_idx = 2; 648 new = os->sample_buffer + 1; 649 } 650 651 new->timestamp = timestamp; 652 new->file_offset = file_offset; 653 new->event = event; 654 655 __queue_event(new, s); 656 657 return 0; 658 } 659 660 static void callchain__printf(struct perf_sample *sample) 661 { 662 unsigned int i; 663 664 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 665 666 for (i = 0; i < sample->callchain->nr; i++) 667 printf("..... %2d: %016" PRIx64 "\n", 668 i, sample->callchain->ips[i]); 669 } 670 671 static void perf_session__print_tstamp(struct perf_session *session, 672 union perf_event *event, 673 struct perf_sample *sample) 674 { 675 if (event->header.type != PERF_RECORD_SAMPLE && 676 !session->sample_id_all) { 677 fputs("-1 -1 ", stdout); 678 return; 679 } 680 681 if ((session->sample_type & PERF_SAMPLE_CPU)) 682 printf("%u ", sample->cpu); 683 684 if (session->sample_type & PERF_SAMPLE_TIME) 685 printf("%" PRIu64 " ", sample->time); 686 } 687 688 static void dump_event(struct perf_session *session, union perf_event *event, 689 u64 file_offset, struct perf_sample *sample) 690 { 691 if (!dump_trace) 692 return; 693 694 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 695 file_offset, event->header.size, event->header.type); 696 697 trace_event(event); 698 699 if (sample) 700 perf_session__print_tstamp(session, event, sample); 701 702 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 703 event->header.size, perf_event__name(event->header.type)); 704 } 705 706 static void dump_sample(struct perf_session *session, union perf_event *event, 707 struct perf_sample *sample) 708 { 709 if (!dump_trace) 710 return; 711 712 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n", 713 event->header.misc, sample->pid, sample->tid, sample->ip, 714 sample->period, sample->addr); 715 716 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 717 callchain__printf(sample); 718 } 719 720 static int perf_session_deliver_event(struct perf_session *session, 721 union perf_event *event, 722 struct perf_sample *sample, 723 struct perf_event_ops *ops, 724 u64 file_offset) 725 { 726 struct perf_evsel *evsel; 727 728 dump_event(session, event, file_offset, sample); 729 730 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 731 if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) { 732 /* 733 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here 734 * because the tools right now may apply filters, discarding 735 * some of the samples. For consistency, in the future we 736 * should have something like nr_filtered_samples and remove 737 * the sample->period from total_sample_period, etc, KISS for 738 * now tho. 739 * 740 * Also testing against NULL allows us to handle files without 741 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the 742 * future probably it'll be a good idea to restrict event 743 * processing via perf_session to files with both set. 744 */ 745 hists__inc_nr_events(&evsel->hists, event->header.type); 746 } 747 748 switch (event->header.type) { 749 case PERF_RECORD_SAMPLE: 750 dump_sample(session, event, sample); 751 if (evsel == NULL) { 752 ++session->hists.stats.nr_unknown_id; 753 return -1; 754 } 755 return ops->sample(event, sample, evsel, session); 756 case PERF_RECORD_MMAP: 757 return ops->mmap(event, sample, session); 758 case PERF_RECORD_COMM: 759 return ops->comm(event, sample, session); 760 case PERF_RECORD_FORK: 761 return ops->fork(event, sample, session); 762 case PERF_RECORD_EXIT: 763 return ops->exit(event, sample, session); 764 case PERF_RECORD_LOST: 765 return ops->lost(event, sample, session); 766 case PERF_RECORD_READ: 767 return ops->read(event, sample, session); 768 case PERF_RECORD_THROTTLE: 769 return ops->throttle(event, sample, session); 770 case PERF_RECORD_UNTHROTTLE: 771 return ops->unthrottle(event, sample, session); 772 default: 773 ++session->hists.stats.nr_unknown_events; 774 return -1; 775 } 776 } 777 778 static int perf_session__preprocess_sample(struct perf_session *session, 779 union perf_event *event, struct perf_sample *sample) 780 { 781 if (event->header.type != PERF_RECORD_SAMPLE || 782 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 783 return 0; 784 785 if (!ip_callchain__valid(sample->callchain, event)) { 786 pr_debug("call-chain problem with event, skipping it.\n"); 787 ++session->hists.stats.nr_invalid_chains; 788 session->hists.stats.total_invalid_chains += sample->period; 789 return -EINVAL; 790 } 791 return 0; 792 } 793 794 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 795 struct perf_event_ops *ops, u64 file_offset) 796 { 797 dump_event(session, event, file_offset, NULL); 798 799 /* These events are processed right away */ 800 switch (event->header.type) { 801 case PERF_RECORD_HEADER_ATTR: 802 return ops->attr(event, session); 803 case PERF_RECORD_HEADER_EVENT_TYPE: 804 return ops->event_type(event, session); 805 case PERF_RECORD_HEADER_TRACING_DATA: 806 /* setup for reading amidst mmap */ 807 lseek(session->fd, file_offset, SEEK_SET); 808 return ops->tracing_data(event, session); 809 case PERF_RECORD_HEADER_BUILD_ID: 810 return ops->build_id(event, session); 811 case PERF_RECORD_FINISHED_ROUND: 812 return ops->finished_round(event, session, ops); 813 default: 814 return -EINVAL; 815 } 816 } 817 818 static int perf_session__process_event(struct perf_session *session, 819 union perf_event *event, 820 struct perf_event_ops *ops, 821 u64 file_offset) 822 { 823 struct perf_sample sample; 824 int ret; 825 826 if (session->header.needs_swap && 827 perf_event__swap_ops[event->header.type]) 828 perf_event__swap_ops[event->header.type](event); 829 830 if (event->header.type >= PERF_RECORD_HEADER_MAX) 831 return -EINVAL; 832 833 hists__inc_nr_events(&session->hists, event->header.type); 834 835 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 836 return perf_session__process_user_event(session, event, ops, file_offset); 837 838 /* 839 * For all kernel events we get the sample data 840 */ 841 ret = perf_session__parse_sample(session, event, &sample); 842 if (ret) 843 return ret; 844 845 /* Preprocess sample records - precheck callchains */ 846 if (perf_session__preprocess_sample(session, event, &sample)) 847 return 0; 848 849 if (ops->ordered_samples) { 850 ret = perf_session_queue_event(session, event, &sample, 851 file_offset); 852 if (ret != -ETIME) 853 return ret; 854 } 855 856 return perf_session_deliver_event(session, event, &sample, ops, 857 file_offset); 858 } 859 860 void perf_event_header__bswap(struct perf_event_header *self) 861 { 862 self->type = bswap_32(self->type); 863 self->misc = bswap_16(self->misc); 864 self->size = bswap_16(self->size); 865 } 866 867 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid) 868 { 869 return machine__findnew_thread(&session->host_machine, pid); 870 } 871 872 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 873 { 874 struct thread *thread = perf_session__findnew(self, 0); 875 876 if (thread == NULL || thread__set_comm(thread, "swapper")) { 877 pr_err("problem inserting idle task.\n"); 878 thread = NULL; 879 } 880 881 return thread; 882 } 883 884 static void perf_session__warn_about_errors(const struct perf_session *session, 885 const struct perf_event_ops *ops) 886 { 887 if (ops->lost == perf_event__process_lost && 888 session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) { 889 ui__warning("Processed %d events and lost %d chunks!\n\n" 890 "Check IO/CPU overload!\n\n", 891 session->hists.stats.nr_events[0], 892 session->hists.stats.nr_events[PERF_RECORD_LOST]); 893 } 894 895 if (session->hists.stats.nr_unknown_events != 0) { 896 ui__warning("Found %u unknown events!\n\n" 897 "Is this an older tool processing a perf.data " 898 "file generated by a more recent tool?\n\n" 899 "If that is not the case, consider " 900 "reporting to linux-kernel@vger.kernel.org.\n\n", 901 session->hists.stats.nr_unknown_events); 902 } 903 904 if (session->hists.stats.nr_unknown_id != 0) { 905 ui__warning("%u samples with id not present in the header\n", 906 session->hists.stats.nr_unknown_id); 907 } 908 909 if (session->hists.stats.nr_invalid_chains != 0) { 910 ui__warning("Found invalid callchains!\n\n" 911 "%u out of %u events were discarded for this reason.\n\n" 912 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 913 session->hists.stats.nr_invalid_chains, 914 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 915 } 916 } 917 918 #define session_done() (*(volatile int *)(&session_done)) 919 volatile int session_done; 920 921 static int __perf_session__process_pipe_events(struct perf_session *self, 922 struct perf_event_ops *ops) 923 { 924 union perf_event event; 925 uint32_t size; 926 int skip = 0; 927 u64 head; 928 int err; 929 void *p; 930 931 perf_event_ops__fill_defaults(ops); 932 933 head = 0; 934 more: 935 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 936 if (err <= 0) { 937 if (err == 0) 938 goto done; 939 940 pr_err("failed to read event header\n"); 941 goto out_err; 942 } 943 944 if (self->header.needs_swap) 945 perf_event_header__bswap(&event.header); 946 947 size = event.header.size; 948 if (size == 0) 949 size = 8; 950 951 p = &event; 952 p += sizeof(struct perf_event_header); 953 954 if (size - sizeof(struct perf_event_header)) { 955 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 956 if (err <= 0) { 957 if (err == 0) { 958 pr_err("unexpected end of event stream\n"); 959 goto done; 960 } 961 962 pr_err("failed to read event data\n"); 963 goto out_err; 964 } 965 } 966 967 if (size == 0 || 968 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 969 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 970 head, event.header.size, event.header.type); 971 /* 972 * assume we lost track of the stream, check alignment, and 973 * increment a single u64 in the hope to catch on again 'soon'. 974 */ 975 if (unlikely(head & 7)) 976 head &= ~7ULL; 977 978 size = 8; 979 } 980 981 head += size; 982 983 if (skip > 0) 984 head += skip; 985 986 if (!session_done()) 987 goto more; 988 done: 989 err = 0; 990 out_err: 991 perf_session__warn_about_errors(self, ops); 992 perf_session_free_sample_buffers(self); 993 return err; 994 } 995 996 static union perf_event * 997 fetch_mmaped_event(struct perf_session *session, 998 u64 head, size_t mmap_size, char *buf) 999 { 1000 union perf_event *event; 1001 1002 /* 1003 * Ensure we have enough space remaining to read 1004 * the size of the event in the headers. 1005 */ 1006 if (head + sizeof(event->header) > mmap_size) 1007 return NULL; 1008 1009 event = (union perf_event *)(buf + head); 1010 1011 if (session->header.needs_swap) 1012 perf_event_header__bswap(&event->header); 1013 1014 if (head + event->header.size > mmap_size) 1015 return NULL; 1016 1017 return event; 1018 } 1019 1020 int __perf_session__process_events(struct perf_session *session, 1021 u64 data_offset, u64 data_size, 1022 u64 file_size, struct perf_event_ops *ops) 1023 { 1024 u64 head, page_offset, file_offset, file_pos, progress_next; 1025 int err, mmap_prot, mmap_flags, map_idx = 0; 1026 size_t page_size, mmap_size; 1027 char *buf, *mmaps[8]; 1028 union perf_event *event; 1029 uint32_t size; 1030 1031 perf_event_ops__fill_defaults(ops); 1032 1033 page_size = sysconf(_SC_PAGESIZE); 1034 1035 page_offset = page_size * (data_offset / page_size); 1036 file_offset = page_offset; 1037 head = data_offset - page_offset; 1038 1039 if (data_offset + data_size < file_size) 1040 file_size = data_offset + data_size; 1041 1042 progress_next = file_size / 16; 1043 1044 mmap_size = session->mmap_window; 1045 if (mmap_size > file_size) 1046 mmap_size = file_size; 1047 1048 memset(mmaps, 0, sizeof(mmaps)); 1049 1050 mmap_prot = PROT_READ; 1051 mmap_flags = MAP_SHARED; 1052 1053 if (session->header.needs_swap) { 1054 mmap_prot |= PROT_WRITE; 1055 mmap_flags = MAP_PRIVATE; 1056 } 1057 remap: 1058 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1059 file_offset); 1060 if (buf == MAP_FAILED) { 1061 pr_err("failed to mmap file\n"); 1062 err = -errno; 1063 goto out_err; 1064 } 1065 mmaps[map_idx] = buf; 1066 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1067 file_pos = file_offset + head; 1068 1069 more: 1070 event = fetch_mmaped_event(session, head, mmap_size, buf); 1071 if (!event) { 1072 if (mmaps[map_idx]) { 1073 munmap(mmaps[map_idx], mmap_size); 1074 mmaps[map_idx] = NULL; 1075 } 1076 1077 page_offset = page_size * (head / page_size); 1078 file_offset += page_offset; 1079 head -= page_offset; 1080 goto remap; 1081 } 1082 1083 size = event->header.size; 1084 1085 if (size == 0 || 1086 perf_session__process_event(session, event, ops, file_pos) < 0) { 1087 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1088 file_offset + head, event->header.size, 1089 event->header.type); 1090 /* 1091 * assume we lost track of the stream, check alignment, and 1092 * increment a single u64 in the hope to catch on again 'soon'. 1093 */ 1094 if (unlikely(head & 7)) 1095 head &= ~7ULL; 1096 1097 size = 8; 1098 } 1099 1100 head += size; 1101 file_pos += size; 1102 1103 if (file_pos >= progress_next) { 1104 progress_next += file_size / 16; 1105 ui_progress__update(file_pos, file_size, 1106 "Processing events..."); 1107 } 1108 1109 if (file_pos < file_size) 1110 goto more; 1111 1112 err = 0; 1113 /* do the final flush for ordered samples */ 1114 session->ordered_samples.next_flush = ULLONG_MAX; 1115 flush_sample_queue(session, ops); 1116 out_err: 1117 perf_session__warn_about_errors(session, ops); 1118 perf_session_free_sample_buffers(session); 1119 return err; 1120 } 1121 1122 int perf_session__process_events(struct perf_session *self, 1123 struct perf_event_ops *ops) 1124 { 1125 int err; 1126 1127 if (perf_session__register_idle_thread(self) == NULL) 1128 return -ENOMEM; 1129 1130 if (!self->fd_pipe) 1131 err = __perf_session__process_events(self, 1132 self->header.data_offset, 1133 self->header.data_size, 1134 self->size, ops); 1135 else 1136 err = __perf_session__process_pipe_events(self, ops); 1137 1138 return err; 1139 } 1140 1141 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1142 { 1143 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1144 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1145 return false; 1146 } 1147 1148 return true; 1149 } 1150 1151 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1152 const char *symbol_name, 1153 u64 addr) 1154 { 1155 char *bracket; 1156 enum map_type i; 1157 struct ref_reloc_sym *ref; 1158 1159 ref = zalloc(sizeof(struct ref_reloc_sym)); 1160 if (ref == NULL) 1161 return -ENOMEM; 1162 1163 ref->name = strdup(symbol_name); 1164 if (ref->name == NULL) { 1165 free(ref); 1166 return -ENOMEM; 1167 } 1168 1169 bracket = strchr(ref->name, ']'); 1170 if (bracket) 1171 *bracket = '\0'; 1172 1173 ref->addr = addr; 1174 1175 for (i = 0; i < MAP__NR_TYPES; ++i) { 1176 struct kmap *kmap = map__kmap(maps[i]); 1177 kmap->ref_reloc_sym = ref; 1178 } 1179 1180 return 0; 1181 } 1182 1183 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1184 { 1185 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1186 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1187 machines__fprintf_dsos(&self->machines, fp); 1188 } 1189 1190 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1191 bool with_hits) 1192 { 1193 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1194 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1195 } 1196 1197 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1198 { 1199 struct perf_evsel *pos; 1200 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1201 1202 ret += hists__fprintf_nr_events(&session->hists, fp); 1203 1204 list_for_each_entry(pos, &session->evlist->entries, node) { 1205 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1206 ret += hists__fprintf_nr_events(&pos->hists, fp); 1207 } 1208 1209 return ret; 1210 } 1211 1212 size_t perf_session__fprintf(struct perf_session *session, FILE *fp) 1213 { 1214 /* 1215 * FIXME: Here we have to actually print all the machines in this 1216 * session, not just the host... 1217 */ 1218 return machine__fprintf(&session->host_machine, fp); 1219 } 1220 1221 void perf_session__remove_thread(struct perf_session *session, 1222 struct thread *th) 1223 { 1224 /* 1225 * FIXME: This one makes no sense, we need to remove the thread from 1226 * the machine it belongs to, perf_session can have many machines, so 1227 * doing it always on ->host_machine is wrong. Fix when auditing all 1228 * the 'perf kvm' code. 1229 */ 1230 machine__remove_thread(&session->host_machine, th); 1231 } 1232 1233 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1234 unsigned int type) 1235 { 1236 struct perf_evsel *pos; 1237 1238 list_for_each_entry(pos, &session->evlist->entries, node) { 1239 if (pos->attr.type == type) 1240 return pos; 1241 } 1242 return NULL; 1243 } 1244 1245 void perf_session__print_ip(union perf_event *event, 1246 struct perf_sample *sample, 1247 struct perf_session *session, 1248 int print_sym, int print_dso) 1249 { 1250 struct addr_location al; 1251 const char *symname, *dsoname; 1252 struct callchain_cursor *cursor = &session->callchain_cursor; 1253 struct callchain_cursor_node *node; 1254 1255 if (perf_event__preprocess_sample(event, session, &al, sample, 1256 NULL) < 0) { 1257 error("problem processing %d event, skipping it.\n", 1258 event->header.type); 1259 return; 1260 } 1261 1262 if (symbol_conf.use_callchain && sample->callchain) { 1263 1264 if (perf_session__resolve_callchain(session, al.thread, 1265 sample->callchain, NULL) != 0) { 1266 if (verbose) 1267 error("Failed to resolve callchain. Skipping\n"); 1268 return; 1269 } 1270 callchain_cursor_commit(cursor); 1271 1272 while (1) { 1273 node = callchain_cursor_current(cursor); 1274 if (!node) 1275 break; 1276 1277 printf("\t%16" PRIx64, node->ip); 1278 if (print_sym) { 1279 if (node->sym && node->sym->name) 1280 symname = node->sym->name; 1281 else 1282 symname = ""; 1283 1284 printf(" %s", symname); 1285 } 1286 if (print_dso) { 1287 if (node->map && node->map->dso && node->map->dso->name) 1288 dsoname = node->map->dso->name; 1289 else 1290 dsoname = ""; 1291 1292 printf(" (%s)", dsoname); 1293 } 1294 printf("\n"); 1295 1296 callchain_cursor_advance(cursor); 1297 } 1298 1299 } else { 1300 printf("%16" PRIx64, sample->ip); 1301 if (print_sym) { 1302 if (al.sym && al.sym->name) 1303 symname = al.sym->name; 1304 else 1305 symname = ""; 1306 1307 printf(" %s", symname); 1308 } 1309 1310 if (print_dso) { 1311 if (al.map && al.map->dso && al.map->dso->name) 1312 dsoname = al.map->dso->name; 1313 else 1314 dsoname = ""; 1315 1316 printf(" (%s)", dsoname); 1317 } 1318 } 1319 } 1320 1321 int perf_session__cpu_bitmap(struct perf_session *session, 1322 const char *cpu_list, unsigned long *cpu_bitmap) 1323 { 1324 int i; 1325 struct cpu_map *map; 1326 1327 for (i = 0; i < PERF_TYPE_MAX; ++i) { 1328 struct perf_evsel *evsel; 1329 1330 evsel = perf_session__find_first_evtype(session, i); 1331 if (!evsel) 1332 continue; 1333 1334 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) { 1335 pr_err("File does not contain CPU events. " 1336 "Remove -c option to proceed.\n"); 1337 return -1; 1338 } 1339 } 1340 1341 map = cpu_map__new(cpu_list); 1342 1343 for (i = 0; i < map->nr; i++) { 1344 int cpu = map->map[i]; 1345 1346 if (cpu >= MAX_NR_CPUS) { 1347 pr_err("Requested CPU %d too large. " 1348 "Consider raising MAX_NR_CPUS\n", cpu); 1349 return -1; 1350 } 1351 1352 set_bit(cpu, cpu_bitmap); 1353 } 1354 1355 return 0; 1356 } 1357 1358 void perf_session__fprintf_info(struct perf_session *session, FILE *fp, 1359 bool full) 1360 { 1361 struct stat st; 1362 int ret; 1363 1364 if (session == NULL || fp == NULL) 1365 return; 1366 1367 ret = fstat(session->fd, &st); 1368 if (ret == -1) 1369 return; 1370 1371 fprintf(fp, "# ========\n"); 1372 fprintf(fp, "# captured on: %s", ctime(&st.st_ctime)); 1373 perf_header__fprintf_info(session, fp, full); 1374 fprintf(fp, "# ========\n#\n"); 1375 } 1376