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, struct perf_evsel *evsel, 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(&evsel->hists.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(&evsel->hists.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_synth_attr_stub(union perf_event *event __used, 281 struct perf_evlist **pevlist __used) 282 { 283 dump_printf(": unhandled!\n"); 284 return 0; 285 } 286 287 static int process_event_sample_stub(union perf_event *event __used, 288 struct perf_sample *sample __used, 289 struct perf_evsel *evsel __used, 290 struct perf_session *session __used) 291 { 292 dump_printf(": unhandled!\n"); 293 return 0; 294 } 295 296 static int process_event_stub(union perf_event *event __used, 297 struct perf_sample *sample __used, 298 struct perf_session *session __used) 299 { 300 dump_printf(": unhandled!\n"); 301 return 0; 302 } 303 304 static int process_finished_round_stub(union perf_event *event __used, 305 struct perf_session *session __used, 306 struct perf_event_ops *ops __used) 307 { 308 dump_printf(": unhandled!\n"); 309 return 0; 310 } 311 312 static int process_finished_round(union perf_event *event, 313 struct perf_session *session, 314 struct perf_event_ops *ops); 315 316 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 317 { 318 if (handler->sample == NULL) 319 handler->sample = process_event_sample_stub; 320 if (handler->mmap == NULL) 321 handler->mmap = process_event_stub; 322 if (handler->comm == NULL) 323 handler->comm = process_event_stub; 324 if (handler->fork == NULL) 325 handler->fork = process_event_stub; 326 if (handler->exit == NULL) 327 handler->exit = process_event_stub; 328 if (handler->lost == NULL) 329 handler->lost = perf_event__process_lost; 330 if (handler->read == NULL) 331 handler->read = process_event_stub; 332 if (handler->throttle == NULL) 333 handler->throttle = process_event_stub; 334 if (handler->unthrottle == NULL) 335 handler->unthrottle = process_event_stub; 336 if (handler->attr == NULL) 337 handler->attr = process_event_synth_attr_stub; 338 if (handler->event_type == NULL) 339 handler->event_type = process_event_synth_stub; 340 if (handler->tracing_data == NULL) 341 handler->tracing_data = process_event_synth_stub; 342 if (handler->build_id == NULL) 343 handler->build_id = process_event_synth_stub; 344 if (handler->finished_round == NULL) { 345 if (handler->ordered_samples) 346 handler->finished_round = process_finished_round; 347 else 348 handler->finished_round = process_finished_round_stub; 349 } 350 } 351 352 void mem_bswap_64(void *src, int byte_size) 353 { 354 u64 *m = src; 355 356 while (byte_size > 0) { 357 *m = bswap_64(*m); 358 byte_size -= sizeof(u64); 359 ++m; 360 } 361 } 362 363 static void perf_event__all64_swap(union perf_event *event) 364 { 365 struct perf_event_header *hdr = &event->header; 366 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 367 } 368 369 static void perf_event__comm_swap(union perf_event *event) 370 { 371 event->comm.pid = bswap_32(event->comm.pid); 372 event->comm.tid = bswap_32(event->comm.tid); 373 } 374 375 static void perf_event__mmap_swap(union perf_event *event) 376 { 377 event->mmap.pid = bswap_32(event->mmap.pid); 378 event->mmap.tid = bswap_32(event->mmap.tid); 379 event->mmap.start = bswap_64(event->mmap.start); 380 event->mmap.len = bswap_64(event->mmap.len); 381 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 382 } 383 384 static void perf_event__task_swap(union perf_event *event) 385 { 386 event->fork.pid = bswap_32(event->fork.pid); 387 event->fork.tid = bswap_32(event->fork.tid); 388 event->fork.ppid = bswap_32(event->fork.ppid); 389 event->fork.ptid = bswap_32(event->fork.ptid); 390 event->fork.time = bswap_64(event->fork.time); 391 } 392 393 static void perf_event__read_swap(union perf_event *event) 394 { 395 event->read.pid = bswap_32(event->read.pid); 396 event->read.tid = bswap_32(event->read.tid); 397 event->read.value = bswap_64(event->read.value); 398 event->read.time_enabled = bswap_64(event->read.time_enabled); 399 event->read.time_running = bswap_64(event->read.time_running); 400 event->read.id = bswap_64(event->read.id); 401 } 402 403 /* exported for swapping attributes in file header */ 404 void perf_event__attr_swap(struct perf_event_attr *attr) 405 { 406 attr->type = bswap_32(attr->type); 407 attr->size = bswap_32(attr->size); 408 attr->config = bswap_64(attr->config); 409 attr->sample_period = bswap_64(attr->sample_period); 410 attr->sample_type = bswap_64(attr->sample_type); 411 attr->read_format = bswap_64(attr->read_format); 412 attr->wakeup_events = bswap_32(attr->wakeup_events); 413 attr->bp_type = bswap_32(attr->bp_type); 414 attr->bp_addr = bswap_64(attr->bp_addr); 415 attr->bp_len = bswap_64(attr->bp_len); 416 } 417 418 static void perf_event__hdr_attr_swap(union perf_event *event) 419 { 420 size_t size; 421 422 perf_event__attr_swap(&event->attr.attr); 423 424 size = event->header.size; 425 size -= (void *)&event->attr.id - (void *)event; 426 mem_bswap_64(event->attr.id, size); 427 } 428 429 static void perf_event__event_type_swap(union perf_event *event) 430 { 431 event->event_type.event_type.event_id = 432 bswap_64(event->event_type.event_type.event_id); 433 } 434 435 static void perf_event__tracing_data_swap(union perf_event *event) 436 { 437 event->tracing_data.size = bswap_32(event->tracing_data.size); 438 } 439 440 typedef void (*perf_event__swap_op)(union perf_event *event); 441 442 static perf_event__swap_op perf_event__swap_ops[] = { 443 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 444 [PERF_RECORD_COMM] = perf_event__comm_swap, 445 [PERF_RECORD_FORK] = perf_event__task_swap, 446 [PERF_RECORD_EXIT] = perf_event__task_swap, 447 [PERF_RECORD_LOST] = perf_event__all64_swap, 448 [PERF_RECORD_READ] = perf_event__read_swap, 449 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 450 [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, 451 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 452 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 453 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 454 [PERF_RECORD_HEADER_MAX] = NULL, 455 }; 456 457 struct sample_queue { 458 u64 timestamp; 459 u64 file_offset; 460 union perf_event *event; 461 struct list_head list; 462 }; 463 464 static void perf_session_free_sample_buffers(struct perf_session *session) 465 { 466 struct ordered_samples *os = &session->ordered_samples; 467 468 while (!list_empty(&os->to_free)) { 469 struct sample_queue *sq; 470 471 sq = list_entry(os->to_free.next, struct sample_queue, list); 472 list_del(&sq->list); 473 free(sq); 474 } 475 } 476 477 static int perf_session_deliver_event(struct perf_session *session, 478 union perf_event *event, 479 struct perf_sample *sample, 480 struct perf_event_ops *ops, 481 u64 file_offset); 482 483 static void flush_sample_queue(struct perf_session *s, 484 struct perf_event_ops *ops) 485 { 486 struct ordered_samples *os = &s->ordered_samples; 487 struct list_head *head = &os->samples; 488 struct sample_queue *tmp, *iter; 489 struct perf_sample sample; 490 u64 limit = os->next_flush; 491 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 492 unsigned idx = 0, progress_next = os->nr_samples / 16; 493 int ret; 494 495 if (!ops->ordered_samples || !limit) 496 return; 497 498 list_for_each_entry_safe(iter, tmp, head, list) { 499 if (iter->timestamp > limit) 500 break; 501 502 ret = perf_session__parse_sample(s, iter->event, &sample); 503 if (ret) 504 pr_err("Can't parse sample, err = %d\n", ret); 505 else 506 perf_session_deliver_event(s, iter->event, &sample, ops, 507 iter->file_offset); 508 509 os->last_flush = iter->timestamp; 510 list_del(&iter->list); 511 list_add(&iter->list, &os->sample_cache); 512 if (++idx >= progress_next) { 513 progress_next += os->nr_samples / 16; 514 ui_progress__update(idx, os->nr_samples, 515 "Processing time ordered events..."); 516 } 517 } 518 519 if (list_empty(head)) { 520 os->last_sample = NULL; 521 } else if (last_ts <= limit) { 522 os->last_sample = 523 list_entry(head->prev, struct sample_queue, list); 524 } 525 526 os->nr_samples = 0; 527 } 528 529 /* 530 * When perf record finishes a pass on every buffers, it records this pseudo 531 * event. 532 * We record the max timestamp t found in the pass n. 533 * Assuming these timestamps are monotonic across cpus, we know that if 534 * a buffer still has events with timestamps below t, they will be all 535 * available and then read in the pass n + 1. 536 * Hence when we start to read the pass n + 2, we can safely flush every 537 * events with timestamps below t. 538 * 539 * ============ PASS n ================= 540 * CPU 0 | CPU 1 541 * | 542 * cnt1 timestamps | cnt2 timestamps 543 * 1 | 2 544 * 2 | 3 545 * - | 4 <--- max recorded 546 * 547 * ============ PASS n + 1 ============== 548 * CPU 0 | CPU 1 549 * | 550 * cnt1 timestamps | cnt2 timestamps 551 * 3 | 5 552 * 4 | 6 553 * 5 | 7 <---- max recorded 554 * 555 * Flush every events below timestamp 4 556 * 557 * ============ PASS n + 2 ============== 558 * CPU 0 | CPU 1 559 * | 560 * cnt1 timestamps | cnt2 timestamps 561 * 6 | 8 562 * 7 | 9 563 * - | 10 564 * 565 * Flush every events below timestamp 7 566 * etc... 567 */ 568 static int process_finished_round(union perf_event *event __used, 569 struct perf_session *session, 570 struct perf_event_ops *ops) 571 { 572 flush_sample_queue(session, ops); 573 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 574 575 return 0; 576 } 577 578 /* The queue is ordered by time */ 579 static void __queue_event(struct sample_queue *new, struct perf_session *s) 580 { 581 struct ordered_samples *os = &s->ordered_samples; 582 struct sample_queue *sample = os->last_sample; 583 u64 timestamp = new->timestamp; 584 struct list_head *p; 585 586 ++os->nr_samples; 587 os->last_sample = new; 588 589 if (!sample) { 590 list_add(&new->list, &os->samples); 591 os->max_timestamp = timestamp; 592 return; 593 } 594 595 /* 596 * last_sample might point to some random place in the list as it's 597 * the last queued event. We expect that the new event is close to 598 * this. 599 */ 600 if (sample->timestamp <= timestamp) { 601 while (sample->timestamp <= timestamp) { 602 p = sample->list.next; 603 if (p == &os->samples) { 604 list_add_tail(&new->list, &os->samples); 605 os->max_timestamp = timestamp; 606 return; 607 } 608 sample = list_entry(p, struct sample_queue, list); 609 } 610 list_add_tail(&new->list, &sample->list); 611 } else { 612 while (sample->timestamp > timestamp) { 613 p = sample->list.prev; 614 if (p == &os->samples) { 615 list_add(&new->list, &os->samples); 616 return; 617 } 618 sample = list_entry(p, struct sample_queue, list); 619 } 620 list_add(&new->list, &sample->list); 621 } 622 } 623 624 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 625 626 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 627 struct perf_sample *sample, u64 file_offset) 628 { 629 struct ordered_samples *os = &s->ordered_samples; 630 struct list_head *sc = &os->sample_cache; 631 u64 timestamp = sample->time; 632 struct sample_queue *new; 633 634 if (!timestamp || timestamp == ~0ULL) 635 return -ETIME; 636 637 if (timestamp < s->ordered_samples.last_flush) { 638 printf("Warning: Timestamp below last timeslice flush\n"); 639 return -EINVAL; 640 } 641 642 if (!list_empty(sc)) { 643 new = list_entry(sc->next, struct sample_queue, list); 644 list_del(&new->list); 645 } else if (os->sample_buffer) { 646 new = os->sample_buffer + os->sample_buffer_idx; 647 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 648 os->sample_buffer = NULL; 649 } else { 650 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 651 if (!os->sample_buffer) 652 return -ENOMEM; 653 list_add(&os->sample_buffer->list, &os->to_free); 654 os->sample_buffer_idx = 2; 655 new = os->sample_buffer + 1; 656 } 657 658 new->timestamp = timestamp; 659 new->file_offset = file_offset; 660 new->event = event; 661 662 __queue_event(new, s); 663 664 return 0; 665 } 666 667 static void callchain__printf(struct perf_sample *sample) 668 { 669 unsigned int i; 670 671 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 672 673 for (i = 0; i < sample->callchain->nr; i++) 674 printf("..... %2d: %016" PRIx64 "\n", 675 i, sample->callchain->ips[i]); 676 } 677 678 static void perf_session__print_tstamp(struct perf_session *session, 679 union perf_event *event, 680 struct perf_sample *sample) 681 { 682 if (event->header.type != PERF_RECORD_SAMPLE && 683 !session->sample_id_all) { 684 fputs("-1 -1 ", stdout); 685 return; 686 } 687 688 if ((session->sample_type & PERF_SAMPLE_CPU)) 689 printf("%u ", sample->cpu); 690 691 if (session->sample_type & PERF_SAMPLE_TIME) 692 printf("%" PRIu64 " ", sample->time); 693 } 694 695 static void dump_event(struct perf_session *session, union perf_event *event, 696 u64 file_offset, struct perf_sample *sample) 697 { 698 if (!dump_trace) 699 return; 700 701 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 702 file_offset, event->header.size, event->header.type); 703 704 trace_event(event); 705 706 if (sample) 707 perf_session__print_tstamp(session, event, sample); 708 709 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 710 event->header.size, perf_event__name(event->header.type)); 711 } 712 713 static void dump_sample(struct perf_session *session, union perf_event *event, 714 struct perf_sample *sample) 715 { 716 if (!dump_trace) 717 return; 718 719 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n", 720 event->header.misc, sample->pid, sample->tid, sample->ip, 721 sample->period, sample->addr); 722 723 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 724 callchain__printf(sample); 725 } 726 727 static int perf_session_deliver_event(struct perf_session *session, 728 union perf_event *event, 729 struct perf_sample *sample, 730 struct perf_event_ops *ops, 731 u64 file_offset) 732 { 733 struct perf_evsel *evsel; 734 735 dump_event(session, event, file_offset, sample); 736 737 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 738 if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) { 739 /* 740 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here 741 * because the tools right now may apply filters, discarding 742 * some of the samples. For consistency, in the future we 743 * should have something like nr_filtered_samples and remove 744 * the sample->period from total_sample_period, etc, KISS for 745 * now tho. 746 * 747 * Also testing against NULL allows us to handle files without 748 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the 749 * future probably it'll be a good idea to restrict event 750 * processing via perf_session to files with both set. 751 */ 752 hists__inc_nr_events(&evsel->hists, event->header.type); 753 } 754 755 switch (event->header.type) { 756 case PERF_RECORD_SAMPLE: 757 dump_sample(session, event, sample); 758 if (evsel == NULL) { 759 ++session->hists.stats.nr_unknown_id; 760 return -1; 761 } 762 return ops->sample(event, sample, evsel, session); 763 case PERF_RECORD_MMAP: 764 return ops->mmap(event, sample, session); 765 case PERF_RECORD_COMM: 766 return ops->comm(event, sample, session); 767 case PERF_RECORD_FORK: 768 return ops->fork(event, sample, session); 769 case PERF_RECORD_EXIT: 770 return ops->exit(event, sample, session); 771 case PERF_RECORD_LOST: 772 return ops->lost(event, sample, session); 773 case PERF_RECORD_READ: 774 return ops->read(event, sample, session); 775 case PERF_RECORD_THROTTLE: 776 return ops->throttle(event, sample, session); 777 case PERF_RECORD_UNTHROTTLE: 778 return ops->unthrottle(event, sample, session); 779 default: 780 ++session->hists.stats.nr_unknown_events; 781 return -1; 782 } 783 } 784 785 static int perf_session__preprocess_sample(struct perf_session *session, 786 union perf_event *event, struct perf_sample *sample) 787 { 788 if (event->header.type != PERF_RECORD_SAMPLE || 789 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 790 return 0; 791 792 if (!ip_callchain__valid(sample->callchain, event)) { 793 pr_debug("call-chain problem with event, skipping it.\n"); 794 ++session->hists.stats.nr_invalid_chains; 795 session->hists.stats.total_invalid_chains += sample->period; 796 return -EINVAL; 797 } 798 return 0; 799 } 800 801 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 802 struct perf_event_ops *ops, u64 file_offset) 803 { 804 int err; 805 806 dump_event(session, event, file_offset, NULL); 807 808 /* These events are processed right away */ 809 switch (event->header.type) { 810 case PERF_RECORD_HEADER_ATTR: 811 err = ops->attr(event, &session->evlist); 812 if (err == 0) 813 perf_session__update_sample_type(session); 814 return err; 815 case PERF_RECORD_HEADER_EVENT_TYPE: 816 return ops->event_type(event, session); 817 case PERF_RECORD_HEADER_TRACING_DATA: 818 /* setup for reading amidst mmap */ 819 lseek(session->fd, file_offset, SEEK_SET); 820 return ops->tracing_data(event, session); 821 case PERF_RECORD_HEADER_BUILD_ID: 822 return ops->build_id(event, session); 823 case PERF_RECORD_FINISHED_ROUND: 824 return ops->finished_round(event, session, ops); 825 default: 826 return -EINVAL; 827 } 828 } 829 830 static int perf_session__process_event(struct perf_session *session, 831 union perf_event *event, 832 struct perf_event_ops *ops, 833 u64 file_offset) 834 { 835 struct perf_sample sample; 836 int ret; 837 838 if (session->header.needs_swap && 839 perf_event__swap_ops[event->header.type]) 840 perf_event__swap_ops[event->header.type](event); 841 842 if (event->header.type >= PERF_RECORD_HEADER_MAX) 843 return -EINVAL; 844 845 hists__inc_nr_events(&session->hists, event->header.type); 846 847 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 848 return perf_session__process_user_event(session, event, ops, file_offset); 849 850 /* 851 * For all kernel events we get the sample data 852 */ 853 ret = perf_session__parse_sample(session, event, &sample); 854 if (ret) 855 return ret; 856 857 /* Preprocess sample records - precheck callchains */ 858 if (perf_session__preprocess_sample(session, event, &sample)) 859 return 0; 860 861 if (ops->ordered_samples) { 862 ret = perf_session_queue_event(session, event, &sample, 863 file_offset); 864 if (ret != -ETIME) 865 return ret; 866 } 867 868 return perf_session_deliver_event(session, event, &sample, ops, 869 file_offset); 870 } 871 872 void perf_event_header__bswap(struct perf_event_header *self) 873 { 874 self->type = bswap_32(self->type); 875 self->misc = bswap_16(self->misc); 876 self->size = bswap_16(self->size); 877 } 878 879 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid) 880 { 881 return machine__findnew_thread(&session->host_machine, pid); 882 } 883 884 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 885 { 886 struct thread *thread = perf_session__findnew(self, 0); 887 888 if (thread == NULL || thread__set_comm(thread, "swapper")) { 889 pr_err("problem inserting idle task.\n"); 890 thread = NULL; 891 } 892 893 return thread; 894 } 895 896 static void perf_session__warn_about_errors(const struct perf_session *session, 897 const struct perf_event_ops *ops) 898 { 899 if (ops->lost == perf_event__process_lost && 900 session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) { 901 ui__warning("Processed %d events and lost %d chunks!\n\n" 902 "Check IO/CPU overload!\n\n", 903 session->hists.stats.nr_events[0], 904 session->hists.stats.nr_events[PERF_RECORD_LOST]); 905 } 906 907 if (session->hists.stats.nr_unknown_events != 0) { 908 ui__warning("Found %u unknown events!\n\n" 909 "Is this an older tool processing a perf.data " 910 "file generated by a more recent tool?\n\n" 911 "If that is not the case, consider " 912 "reporting to linux-kernel@vger.kernel.org.\n\n", 913 session->hists.stats.nr_unknown_events); 914 } 915 916 if (session->hists.stats.nr_unknown_id != 0) { 917 ui__warning("%u samples with id not present in the header\n", 918 session->hists.stats.nr_unknown_id); 919 } 920 921 if (session->hists.stats.nr_invalid_chains != 0) { 922 ui__warning("Found invalid callchains!\n\n" 923 "%u out of %u events were discarded for this reason.\n\n" 924 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 925 session->hists.stats.nr_invalid_chains, 926 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 927 } 928 } 929 930 #define session_done() (*(volatile int *)(&session_done)) 931 volatile int session_done; 932 933 static int __perf_session__process_pipe_events(struct perf_session *self, 934 struct perf_event_ops *ops) 935 { 936 union perf_event event; 937 uint32_t size; 938 int skip = 0; 939 u64 head; 940 int err; 941 void *p; 942 943 perf_event_ops__fill_defaults(ops); 944 945 head = 0; 946 more: 947 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 948 if (err <= 0) { 949 if (err == 0) 950 goto done; 951 952 pr_err("failed to read event header\n"); 953 goto out_err; 954 } 955 956 if (self->header.needs_swap) 957 perf_event_header__bswap(&event.header); 958 959 size = event.header.size; 960 if (size == 0) 961 size = 8; 962 963 p = &event; 964 p += sizeof(struct perf_event_header); 965 966 if (size - sizeof(struct perf_event_header)) { 967 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 968 if (err <= 0) { 969 if (err == 0) { 970 pr_err("unexpected end of event stream\n"); 971 goto done; 972 } 973 974 pr_err("failed to read event data\n"); 975 goto out_err; 976 } 977 } 978 979 if (size == 0 || 980 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 981 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 982 head, event.header.size, event.header.type); 983 /* 984 * assume we lost track of the stream, check alignment, and 985 * increment a single u64 in the hope to catch on again 'soon'. 986 */ 987 if (unlikely(head & 7)) 988 head &= ~7ULL; 989 990 size = 8; 991 } 992 993 head += size; 994 995 if (skip > 0) 996 head += skip; 997 998 if (!session_done()) 999 goto more; 1000 done: 1001 err = 0; 1002 out_err: 1003 perf_session__warn_about_errors(self, ops); 1004 perf_session_free_sample_buffers(self); 1005 return err; 1006 } 1007 1008 static union perf_event * 1009 fetch_mmaped_event(struct perf_session *session, 1010 u64 head, size_t mmap_size, char *buf) 1011 { 1012 union perf_event *event; 1013 1014 /* 1015 * Ensure we have enough space remaining to read 1016 * the size of the event in the headers. 1017 */ 1018 if (head + sizeof(event->header) > mmap_size) 1019 return NULL; 1020 1021 event = (union perf_event *)(buf + head); 1022 1023 if (session->header.needs_swap) 1024 perf_event_header__bswap(&event->header); 1025 1026 if (head + event->header.size > mmap_size) 1027 return NULL; 1028 1029 return event; 1030 } 1031 1032 int __perf_session__process_events(struct perf_session *session, 1033 u64 data_offset, u64 data_size, 1034 u64 file_size, struct perf_event_ops *ops) 1035 { 1036 u64 head, page_offset, file_offset, file_pos, progress_next; 1037 int err, mmap_prot, mmap_flags, map_idx = 0; 1038 size_t page_size, mmap_size; 1039 char *buf, *mmaps[8]; 1040 union perf_event *event; 1041 uint32_t size; 1042 1043 perf_event_ops__fill_defaults(ops); 1044 1045 page_size = sysconf(_SC_PAGESIZE); 1046 1047 page_offset = page_size * (data_offset / page_size); 1048 file_offset = page_offset; 1049 head = data_offset - page_offset; 1050 1051 if (data_offset + data_size < file_size) 1052 file_size = data_offset + data_size; 1053 1054 progress_next = file_size / 16; 1055 1056 mmap_size = session->mmap_window; 1057 if (mmap_size > file_size) 1058 mmap_size = file_size; 1059 1060 memset(mmaps, 0, sizeof(mmaps)); 1061 1062 mmap_prot = PROT_READ; 1063 mmap_flags = MAP_SHARED; 1064 1065 if (session->header.needs_swap) { 1066 mmap_prot |= PROT_WRITE; 1067 mmap_flags = MAP_PRIVATE; 1068 } 1069 remap: 1070 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1071 file_offset); 1072 if (buf == MAP_FAILED) { 1073 pr_err("failed to mmap file\n"); 1074 err = -errno; 1075 goto out_err; 1076 } 1077 mmaps[map_idx] = buf; 1078 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1079 file_pos = file_offset + head; 1080 1081 more: 1082 event = fetch_mmaped_event(session, head, mmap_size, buf); 1083 if (!event) { 1084 if (mmaps[map_idx]) { 1085 munmap(mmaps[map_idx], mmap_size); 1086 mmaps[map_idx] = NULL; 1087 } 1088 1089 page_offset = page_size * (head / page_size); 1090 file_offset += page_offset; 1091 head -= page_offset; 1092 goto remap; 1093 } 1094 1095 size = event->header.size; 1096 1097 if (size == 0 || 1098 perf_session__process_event(session, event, ops, file_pos) < 0) { 1099 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1100 file_offset + head, event->header.size, 1101 event->header.type); 1102 /* 1103 * assume we lost track of the stream, check alignment, and 1104 * increment a single u64 in the hope to catch on again 'soon'. 1105 */ 1106 if (unlikely(head & 7)) 1107 head &= ~7ULL; 1108 1109 size = 8; 1110 } 1111 1112 head += size; 1113 file_pos += size; 1114 1115 if (file_pos >= progress_next) { 1116 progress_next += file_size / 16; 1117 ui_progress__update(file_pos, file_size, 1118 "Processing events..."); 1119 } 1120 1121 if (file_pos < file_size) 1122 goto more; 1123 1124 err = 0; 1125 /* do the final flush for ordered samples */ 1126 session->ordered_samples.next_flush = ULLONG_MAX; 1127 flush_sample_queue(session, ops); 1128 out_err: 1129 perf_session__warn_about_errors(session, ops); 1130 perf_session_free_sample_buffers(session); 1131 return err; 1132 } 1133 1134 int perf_session__process_events(struct perf_session *self, 1135 struct perf_event_ops *ops) 1136 { 1137 int err; 1138 1139 if (perf_session__register_idle_thread(self) == NULL) 1140 return -ENOMEM; 1141 1142 if (!self->fd_pipe) 1143 err = __perf_session__process_events(self, 1144 self->header.data_offset, 1145 self->header.data_size, 1146 self->size, ops); 1147 else 1148 err = __perf_session__process_pipe_events(self, ops); 1149 1150 return err; 1151 } 1152 1153 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1154 { 1155 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1156 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1157 return false; 1158 } 1159 1160 return true; 1161 } 1162 1163 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1164 const char *symbol_name, 1165 u64 addr) 1166 { 1167 char *bracket; 1168 enum map_type i; 1169 struct ref_reloc_sym *ref; 1170 1171 ref = zalloc(sizeof(struct ref_reloc_sym)); 1172 if (ref == NULL) 1173 return -ENOMEM; 1174 1175 ref->name = strdup(symbol_name); 1176 if (ref->name == NULL) { 1177 free(ref); 1178 return -ENOMEM; 1179 } 1180 1181 bracket = strchr(ref->name, ']'); 1182 if (bracket) 1183 *bracket = '\0'; 1184 1185 ref->addr = addr; 1186 1187 for (i = 0; i < MAP__NR_TYPES; ++i) { 1188 struct kmap *kmap = map__kmap(maps[i]); 1189 kmap->ref_reloc_sym = ref; 1190 } 1191 1192 return 0; 1193 } 1194 1195 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1196 { 1197 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1198 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1199 machines__fprintf_dsos(&self->machines, fp); 1200 } 1201 1202 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1203 bool with_hits) 1204 { 1205 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1206 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1207 } 1208 1209 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1210 { 1211 struct perf_evsel *pos; 1212 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1213 1214 ret += hists__fprintf_nr_events(&session->hists, fp); 1215 1216 list_for_each_entry(pos, &session->evlist->entries, node) { 1217 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1218 ret += hists__fprintf_nr_events(&pos->hists, fp); 1219 } 1220 1221 return ret; 1222 } 1223 1224 size_t perf_session__fprintf(struct perf_session *session, FILE *fp) 1225 { 1226 /* 1227 * FIXME: Here we have to actually print all the machines in this 1228 * session, not just the host... 1229 */ 1230 return machine__fprintf(&session->host_machine, fp); 1231 } 1232 1233 void perf_session__remove_thread(struct perf_session *session, 1234 struct thread *th) 1235 { 1236 /* 1237 * FIXME: This one makes no sense, we need to remove the thread from 1238 * the machine it belongs to, perf_session can have many machines, so 1239 * doing it always on ->host_machine is wrong. Fix when auditing all 1240 * the 'perf kvm' code. 1241 */ 1242 machine__remove_thread(&session->host_machine, th); 1243 } 1244 1245 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1246 unsigned int type) 1247 { 1248 struct perf_evsel *pos; 1249 1250 list_for_each_entry(pos, &session->evlist->entries, node) { 1251 if (pos->attr.type == type) 1252 return pos; 1253 } 1254 return NULL; 1255 } 1256 1257 void perf_session__print_ip(union perf_event *event, struct perf_evsel *evsel, 1258 struct perf_sample *sample, 1259 struct perf_session *session, 1260 int print_sym, int print_dso) 1261 { 1262 struct addr_location al; 1263 const char *symname, *dsoname; 1264 struct callchain_cursor *cursor = &evsel->hists.callchain_cursor; 1265 struct callchain_cursor_node *node; 1266 1267 if (perf_event__preprocess_sample(event, session, &al, sample, 1268 NULL) < 0) { 1269 error("problem processing %d event, skipping it.\n", 1270 event->header.type); 1271 return; 1272 } 1273 1274 if (symbol_conf.use_callchain && sample->callchain) { 1275 1276 if (perf_session__resolve_callchain(session, evsel, al.thread, 1277 sample->callchain, NULL) != 0) { 1278 if (verbose) 1279 error("Failed to resolve callchain. Skipping\n"); 1280 return; 1281 } 1282 callchain_cursor_commit(cursor); 1283 1284 while (1) { 1285 node = callchain_cursor_current(cursor); 1286 if (!node) 1287 break; 1288 1289 printf("\t%16" PRIx64, node->ip); 1290 if (print_sym) { 1291 if (node->sym && node->sym->name) 1292 symname = node->sym->name; 1293 else 1294 symname = ""; 1295 1296 printf(" %s", symname); 1297 } 1298 if (print_dso) { 1299 if (node->map && node->map->dso && node->map->dso->name) 1300 dsoname = node->map->dso->name; 1301 else 1302 dsoname = ""; 1303 1304 printf(" (%s)", dsoname); 1305 } 1306 printf("\n"); 1307 1308 callchain_cursor_advance(cursor); 1309 } 1310 1311 } else { 1312 printf("%16" PRIx64, sample->ip); 1313 if (print_sym) { 1314 if (al.sym && al.sym->name) 1315 symname = al.sym->name; 1316 else 1317 symname = ""; 1318 1319 printf(" %s", symname); 1320 } 1321 1322 if (print_dso) { 1323 if (al.map && al.map->dso && al.map->dso->name) 1324 dsoname = al.map->dso->name; 1325 else 1326 dsoname = ""; 1327 1328 printf(" (%s)", dsoname); 1329 } 1330 } 1331 } 1332 1333 int perf_session__cpu_bitmap(struct perf_session *session, 1334 const char *cpu_list, unsigned long *cpu_bitmap) 1335 { 1336 int i; 1337 struct cpu_map *map; 1338 1339 for (i = 0; i < PERF_TYPE_MAX; ++i) { 1340 struct perf_evsel *evsel; 1341 1342 evsel = perf_session__find_first_evtype(session, i); 1343 if (!evsel) 1344 continue; 1345 1346 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) { 1347 pr_err("File does not contain CPU events. " 1348 "Remove -c option to proceed.\n"); 1349 return -1; 1350 } 1351 } 1352 1353 map = cpu_map__new(cpu_list); 1354 1355 for (i = 0; i < map->nr; i++) { 1356 int cpu = map->map[i]; 1357 1358 if (cpu >= MAX_NR_CPUS) { 1359 pr_err("Requested CPU %d too large. " 1360 "Consider raising MAX_NR_CPUS\n", cpu); 1361 return -1; 1362 } 1363 1364 set_bit(cpu, cpu_bitmap); 1365 } 1366 1367 return 0; 1368 } 1369 1370 void perf_session__fprintf_info(struct perf_session *session, FILE *fp, 1371 bool full) 1372 { 1373 struct stat st; 1374 int ret; 1375 1376 if (session == NULL || fp == NULL) 1377 return; 1378 1379 ret = fstat(session->fd, &st); 1380 if (ret == -1) 1381 return; 1382 1383 fprintf(fp, "# ========\n"); 1384 fprintf(fp, "# captured on: %s", ctime(&st.st_ctime)); 1385 perf_header__fprintf_info(session, fp, full); 1386 fprintf(fp, "# ========\n#\n"); 1387 } 1388