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 static void perf_session__id_header_size(struct perf_session *session) 82 { 83 struct perf_sample *data; 84 u64 sample_type = session->sample_type; 85 u16 size = 0; 86 87 if (!session->sample_id_all) 88 goto out; 89 90 if (sample_type & PERF_SAMPLE_TID) 91 size += sizeof(data->tid) * 2; 92 93 if (sample_type & PERF_SAMPLE_TIME) 94 size += sizeof(data->time); 95 96 if (sample_type & PERF_SAMPLE_ID) 97 size += sizeof(data->id); 98 99 if (sample_type & PERF_SAMPLE_STREAM_ID) 100 size += sizeof(data->stream_id); 101 102 if (sample_type & PERF_SAMPLE_CPU) 103 size += sizeof(data->cpu) * 2; 104 out: 105 session->id_hdr_size = size; 106 } 107 108 void perf_session__update_sample_type(struct perf_session *self) 109 { 110 self->sample_type = perf_evlist__sample_type(self->evlist); 111 self->sample_size = __perf_evsel__sample_size(self->sample_type); 112 self->sample_id_all = perf_evlist__sample_id_all(self->evlist); 113 perf_session__id_header_size(self); 114 } 115 116 int perf_session__create_kernel_maps(struct perf_session *self) 117 { 118 int ret = machine__create_kernel_maps(&self->host_machine); 119 120 if (ret >= 0) 121 ret = machines__create_guest_kernel_maps(&self->machines); 122 return ret; 123 } 124 125 static void perf_session__destroy_kernel_maps(struct perf_session *self) 126 { 127 machine__destroy_kernel_maps(&self->host_machine); 128 machines__destroy_guest_kernel_maps(&self->machines); 129 } 130 131 struct perf_session *perf_session__new(const char *filename, int mode, 132 bool force, bool repipe, 133 struct perf_event_ops *ops) 134 { 135 size_t len = filename ? strlen(filename) + 1 : 0; 136 struct perf_session *self = zalloc(sizeof(*self) + len); 137 138 if (self == NULL) 139 goto out; 140 141 memcpy(self->filename, filename, len); 142 self->threads = RB_ROOT; 143 INIT_LIST_HEAD(&self->dead_threads); 144 self->last_match = NULL; 145 /* 146 * On 64bit we can mmap the data file in one go. No need for tiny mmap 147 * slices. On 32bit we use 32MB. 148 */ 149 #if BITS_PER_LONG == 64 150 self->mmap_window = ULLONG_MAX; 151 #else 152 self->mmap_window = 32 * 1024 * 1024ULL; 153 #endif 154 self->machines = RB_ROOT; 155 self->repipe = repipe; 156 INIT_LIST_HEAD(&self->ordered_samples.samples); 157 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 158 INIT_LIST_HEAD(&self->ordered_samples.to_free); 159 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 160 161 if (mode == O_RDONLY) { 162 if (perf_session__open(self, force) < 0) 163 goto out_delete; 164 perf_session__update_sample_type(self); 165 } else if (mode == O_WRONLY) { 166 /* 167 * In O_RDONLY mode this will be performed when reading the 168 * kernel MMAP event, in perf_event__process_mmap(). 169 */ 170 if (perf_session__create_kernel_maps(self) < 0) 171 goto out_delete; 172 } 173 174 if (ops && ops->ordering_requires_timestamps && 175 ops->ordered_samples && !self->sample_id_all) { 176 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 177 ops->ordered_samples = false; 178 } 179 180 out: 181 return self; 182 out_delete: 183 perf_session__delete(self); 184 return NULL; 185 } 186 187 static void perf_session__delete_dead_threads(struct perf_session *self) 188 { 189 struct thread *n, *t; 190 191 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 192 list_del(&t->node); 193 thread__delete(t); 194 } 195 } 196 197 static void perf_session__delete_threads(struct perf_session *self) 198 { 199 struct rb_node *nd = rb_first(&self->threads); 200 201 while (nd) { 202 struct thread *t = rb_entry(nd, struct thread, rb_node); 203 204 rb_erase(&t->rb_node, &self->threads); 205 nd = rb_next(nd); 206 thread__delete(t); 207 } 208 } 209 210 void perf_session__delete(struct perf_session *self) 211 { 212 perf_session__destroy_kernel_maps(self); 213 perf_session__delete_dead_threads(self); 214 perf_session__delete_threads(self); 215 machine__exit(&self->host_machine); 216 close(self->fd); 217 free(self); 218 } 219 220 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 221 { 222 self->last_match = NULL; 223 rb_erase(&th->rb_node, &self->threads); 224 /* 225 * We may have references to this thread, for instance in some hist_entry 226 * instances, so just move them to a separate list. 227 */ 228 list_add_tail(&th->node, &self->dead_threads); 229 } 230 231 static bool symbol__match_parent_regex(struct symbol *sym) 232 { 233 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 234 return 1; 235 236 return 0; 237 } 238 239 int perf_session__resolve_callchain(struct perf_session *self, 240 struct thread *thread, 241 struct ip_callchain *chain, 242 struct symbol **parent) 243 { 244 u8 cpumode = PERF_RECORD_MISC_USER; 245 unsigned int i; 246 int err; 247 248 callchain_cursor_reset(&self->callchain_cursor); 249 250 for (i = 0; i < chain->nr; i++) { 251 u64 ip; 252 struct addr_location al; 253 254 if (callchain_param.order == ORDER_CALLEE) 255 ip = chain->ips[i]; 256 else 257 ip = chain->ips[chain->nr - i - 1]; 258 259 if (ip >= PERF_CONTEXT_MAX) { 260 switch (ip) { 261 case PERF_CONTEXT_HV: 262 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 263 case PERF_CONTEXT_KERNEL: 264 cpumode = PERF_RECORD_MISC_KERNEL; break; 265 case PERF_CONTEXT_USER: 266 cpumode = PERF_RECORD_MISC_USER; break; 267 default: 268 break; 269 } 270 continue; 271 } 272 273 al.filtered = false; 274 thread__find_addr_location(thread, self, cpumode, 275 MAP__FUNCTION, thread->pid, ip, &al, NULL); 276 if (al.sym != NULL) { 277 if (sort__has_parent && !*parent && 278 symbol__match_parent_regex(al.sym)) 279 *parent = al.sym; 280 if (!symbol_conf.use_callchain) 281 break; 282 } 283 284 err = callchain_cursor_append(&self->callchain_cursor, 285 ip, al.map, al.sym); 286 if (err) 287 return err; 288 } 289 290 return 0; 291 } 292 293 static int process_event_synth_stub(union perf_event *event __used, 294 struct perf_session *session __used) 295 { 296 dump_printf(": unhandled!\n"); 297 return 0; 298 } 299 300 static int process_event_sample_stub(union perf_event *event __used, 301 struct perf_sample *sample __used, 302 struct perf_evsel *evsel __used, 303 struct perf_session *session __used) 304 { 305 dump_printf(": unhandled!\n"); 306 return 0; 307 } 308 309 static int process_event_stub(union perf_event *event __used, 310 struct perf_sample *sample __used, 311 struct perf_session *session __used) 312 { 313 dump_printf(": unhandled!\n"); 314 return 0; 315 } 316 317 static int process_finished_round_stub(union perf_event *event __used, 318 struct perf_session *session __used, 319 struct perf_event_ops *ops __used) 320 { 321 dump_printf(": unhandled!\n"); 322 return 0; 323 } 324 325 static int process_finished_round(union perf_event *event, 326 struct perf_session *session, 327 struct perf_event_ops *ops); 328 329 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 330 { 331 if (handler->sample == NULL) 332 handler->sample = process_event_sample_stub; 333 if (handler->mmap == NULL) 334 handler->mmap = process_event_stub; 335 if (handler->comm == NULL) 336 handler->comm = process_event_stub; 337 if (handler->fork == NULL) 338 handler->fork = process_event_stub; 339 if (handler->exit == NULL) 340 handler->exit = process_event_stub; 341 if (handler->lost == NULL) 342 handler->lost = perf_event__process_lost; 343 if (handler->read == NULL) 344 handler->read = process_event_stub; 345 if (handler->throttle == NULL) 346 handler->throttle = process_event_stub; 347 if (handler->unthrottle == NULL) 348 handler->unthrottle = process_event_stub; 349 if (handler->attr == NULL) 350 handler->attr = process_event_synth_stub; 351 if (handler->event_type == NULL) 352 handler->event_type = process_event_synth_stub; 353 if (handler->tracing_data == NULL) 354 handler->tracing_data = process_event_synth_stub; 355 if (handler->build_id == NULL) 356 handler->build_id = process_event_synth_stub; 357 if (handler->finished_round == NULL) { 358 if (handler->ordered_samples) 359 handler->finished_round = process_finished_round; 360 else 361 handler->finished_round = process_finished_round_stub; 362 } 363 } 364 365 void mem_bswap_64(void *src, int byte_size) 366 { 367 u64 *m = src; 368 369 while (byte_size > 0) { 370 *m = bswap_64(*m); 371 byte_size -= sizeof(u64); 372 ++m; 373 } 374 } 375 376 static void perf_event__all64_swap(union perf_event *event) 377 { 378 struct perf_event_header *hdr = &event->header; 379 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 380 } 381 382 static void perf_event__comm_swap(union perf_event *event) 383 { 384 event->comm.pid = bswap_32(event->comm.pid); 385 event->comm.tid = bswap_32(event->comm.tid); 386 } 387 388 static void perf_event__mmap_swap(union perf_event *event) 389 { 390 event->mmap.pid = bswap_32(event->mmap.pid); 391 event->mmap.tid = bswap_32(event->mmap.tid); 392 event->mmap.start = bswap_64(event->mmap.start); 393 event->mmap.len = bswap_64(event->mmap.len); 394 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 395 } 396 397 static void perf_event__task_swap(union perf_event *event) 398 { 399 event->fork.pid = bswap_32(event->fork.pid); 400 event->fork.tid = bswap_32(event->fork.tid); 401 event->fork.ppid = bswap_32(event->fork.ppid); 402 event->fork.ptid = bswap_32(event->fork.ptid); 403 event->fork.time = bswap_64(event->fork.time); 404 } 405 406 static void perf_event__read_swap(union perf_event *event) 407 { 408 event->read.pid = bswap_32(event->read.pid); 409 event->read.tid = bswap_32(event->read.tid); 410 event->read.value = bswap_64(event->read.value); 411 event->read.time_enabled = bswap_64(event->read.time_enabled); 412 event->read.time_running = bswap_64(event->read.time_running); 413 event->read.id = bswap_64(event->read.id); 414 } 415 416 /* exported for swapping attributes in file header */ 417 void perf_event__attr_swap(struct perf_event_attr *attr) 418 { 419 attr->type = bswap_32(attr->type); 420 attr->size = bswap_32(attr->size); 421 attr->config = bswap_64(attr->config); 422 attr->sample_period = bswap_64(attr->sample_period); 423 attr->sample_type = bswap_64(attr->sample_type); 424 attr->read_format = bswap_64(attr->read_format); 425 attr->wakeup_events = bswap_32(attr->wakeup_events); 426 attr->bp_type = bswap_32(attr->bp_type); 427 attr->bp_addr = bswap_64(attr->bp_addr); 428 attr->bp_len = bswap_64(attr->bp_len); 429 } 430 431 static void perf_event__hdr_attr_swap(union perf_event *event) 432 { 433 size_t size; 434 435 perf_event__attr_swap(&event->attr.attr); 436 437 size = event->header.size; 438 size -= (void *)&event->attr.id - (void *)event; 439 mem_bswap_64(event->attr.id, size); 440 } 441 442 static void perf_event__event_type_swap(union perf_event *event) 443 { 444 event->event_type.event_type.event_id = 445 bswap_64(event->event_type.event_type.event_id); 446 } 447 448 static void perf_event__tracing_data_swap(union perf_event *event) 449 { 450 event->tracing_data.size = bswap_32(event->tracing_data.size); 451 } 452 453 typedef void (*perf_event__swap_op)(union perf_event *event); 454 455 static perf_event__swap_op perf_event__swap_ops[] = { 456 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 457 [PERF_RECORD_COMM] = perf_event__comm_swap, 458 [PERF_RECORD_FORK] = perf_event__task_swap, 459 [PERF_RECORD_EXIT] = perf_event__task_swap, 460 [PERF_RECORD_LOST] = perf_event__all64_swap, 461 [PERF_RECORD_READ] = perf_event__read_swap, 462 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 463 [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, 464 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 465 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 466 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 467 [PERF_RECORD_HEADER_MAX] = NULL, 468 }; 469 470 struct sample_queue { 471 u64 timestamp; 472 u64 file_offset; 473 union perf_event *event; 474 struct list_head list; 475 }; 476 477 static void perf_session_free_sample_buffers(struct perf_session *session) 478 { 479 struct ordered_samples *os = &session->ordered_samples; 480 481 while (!list_empty(&os->to_free)) { 482 struct sample_queue *sq; 483 484 sq = list_entry(os->to_free.next, struct sample_queue, list); 485 list_del(&sq->list); 486 free(sq); 487 } 488 } 489 490 static int perf_session_deliver_event(struct perf_session *session, 491 union perf_event *event, 492 struct perf_sample *sample, 493 struct perf_event_ops *ops, 494 u64 file_offset); 495 496 static void flush_sample_queue(struct perf_session *s, 497 struct perf_event_ops *ops) 498 { 499 struct ordered_samples *os = &s->ordered_samples; 500 struct list_head *head = &os->samples; 501 struct sample_queue *tmp, *iter; 502 struct perf_sample sample; 503 u64 limit = os->next_flush; 504 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 505 int ret; 506 507 if (!ops->ordered_samples || !limit) 508 return; 509 510 list_for_each_entry_safe(iter, tmp, head, list) { 511 if (iter->timestamp > limit) 512 break; 513 514 ret = perf_session__parse_sample(s, iter->event, &sample); 515 if (ret) 516 pr_err("Can't parse sample, err = %d\n", ret); 517 else 518 perf_session_deliver_event(s, iter->event, &sample, ops, 519 iter->file_offset); 520 521 os->last_flush = iter->timestamp; 522 list_del(&iter->list); 523 list_add(&iter->list, &os->sample_cache); 524 } 525 526 if (list_empty(head)) { 527 os->last_sample = NULL; 528 } else if (last_ts <= limit) { 529 os->last_sample = 530 list_entry(head->prev, struct sample_queue, list); 531 } 532 } 533 534 /* 535 * When perf record finishes a pass on every buffers, it records this pseudo 536 * event. 537 * We record the max timestamp t found in the pass n. 538 * Assuming these timestamps are monotonic across cpus, we know that if 539 * a buffer still has events with timestamps below t, they will be all 540 * available and then read in the pass n + 1. 541 * Hence when we start to read the pass n + 2, we can safely flush every 542 * events with timestamps below t. 543 * 544 * ============ PASS n ================= 545 * CPU 0 | CPU 1 546 * | 547 * cnt1 timestamps | cnt2 timestamps 548 * 1 | 2 549 * 2 | 3 550 * - | 4 <--- max recorded 551 * 552 * ============ PASS n + 1 ============== 553 * CPU 0 | CPU 1 554 * | 555 * cnt1 timestamps | cnt2 timestamps 556 * 3 | 5 557 * 4 | 6 558 * 5 | 7 <---- max recorded 559 * 560 * Flush every events below timestamp 4 561 * 562 * ============ PASS n + 2 ============== 563 * CPU 0 | CPU 1 564 * | 565 * cnt1 timestamps | cnt2 timestamps 566 * 6 | 8 567 * 7 | 9 568 * - | 10 569 * 570 * Flush every events below timestamp 7 571 * etc... 572 */ 573 static int process_finished_round(union perf_event *event __used, 574 struct perf_session *session, 575 struct perf_event_ops *ops) 576 { 577 flush_sample_queue(session, ops); 578 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 579 580 return 0; 581 } 582 583 /* The queue is ordered by time */ 584 static void __queue_event(struct sample_queue *new, struct perf_session *s) 585 { 586 struct ordered_samples *os = &s->ordered_samples; 587 struct sample_queue *sample = os->last_sample; 588 u64 timestamp = new->timestamp; 589 struct list_head *p; 590 591 os->last_sample = new; 592 593 if (!sample) { 594 list_add(&new->list, &os->samples); 595 os->max_timestamp = timestamp; 596 return; 597 } 598 599 /* 600 * last_sample might point to some random place in the list as it's 601 * the last queued event. We expect that the new event is close to 602 * this. 603 */ 604 if (sample->timestamp <= timestamp) { 605 while (sample->timestamp <= timestamp) { 606 p = sample->list.next; 607 if (p == &os->samples) { 608 list_add_tail(&new->list, &os->samples); 609 os->max_timestamp = timestamp; 610 return; 611 } 612 sample = list_entry(p, struct sample_queue, list); 613 } 614 list_add_tail(&new->list, &sample->list); 615 } else { 616 while (sample->timestamp > timestamp) { 617 p = sample->list.prev; 618 if (p == &os->samples) { 619 list_add(&new->list, &os->samples); 620 return; 621 } 622 sample = list_entry(p, struct sample_queue, list); 623 } 624 list_add(&new->list, &sample->list); 625 } 626 } 627 628 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 629 630 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 631 struct perf_sample *sample, u64 file_offset) 632 { 633 struct ordered_samples *os = &s->ordered_samples; 634 struct list_head *sc = &os->sample_cache; 635 u64 timestamp = sample->time; 636 struct sample_queue *new; 637 638 if (!timestamp || timestamp == ~0ULL) 639 return -ETIME; 640 641 if (timestamp < s->ordered_samples.last_flush) { 642 printf("Warning: Timestamp below last timeslice flush\n"); 643 return -EINVAL; 644 } 645 646 if (!list_empty(sc)) { 647 new = list_entry(sc->next, struct sample_queue, list); 648 list_del(&new->list); 649 } else if (os->sample_buffer) { 650 new = os->sample_buffer + os->sample_buffer_idx; 651 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 652 os->sample_buffer = NULL; 653 } else { 654 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 655 if (!os->sample_buffer) 656 return -ENOMEM; 657 list_add(&os->sample_buffer->list, &os->to_free); 658 os->sample_buffer_idx = 2; 659 new = os->sample_buffer + 1; 660 } 661 662 new->timestamp = timestamp; 663 new->file_offset = file_offset; 664 new->event = event; 665 666 __queue_event(new, s); 667 668 return 0; 669 } 670 671 static void callchain__printf(struct perf_sample *sample) 672 { 673 unsigned int i; 674 675 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 676 677 for (i = 0; i < sample->callchain->nr; i++) 678 printf("..... %2d: %016" PRIx64 "\n", 679 i, sample->callchain->ips[i]); 680 } 681 682 static void perf_session__print_tstamp(struct perf_session *session, 683 union perf_event *event, 684 struct perf_sample *sample) 685 { 686 if (event->header.type != PERF_RECORD_SAMPLE && 687 !session->sample_id_all) { 688 fputs("-1 -1 ", stdout); 689 return; 690 } 691 692 if ((session->sample_type & PERF_SAMPLE_CPU)) 693 printf("%u ", sample->cpu); 694 695 if (session->sample_type & PERF_SAMPLE_TIME) 696 printf("%" PRIu64 " ", sample->time); 697 } 698 699 static void dump_event(struct perf_session *session, union perf_event *event, 700 u64 file_offset, struct perf_sample *sample) 701 { 702 if (!dump_trace) 703 return; 704 705 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 706 file_offset, event->header.size, event->header.type); 707 708 trace_event(event); 709 710 if (sample) 711 perf_session__print_tstamp(session, event, sample); 712 713 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 714 event->header.size, perf_event__name(event->header.type)); 715 } 716 717 static void dump_sample(struct perf_session *session, union perf_event *event, 718 struct perf_sample *sample) 719 { 720 if (!dump_trace) 721 return; 722 723 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n", 724 event->header.misc, sample->pid, sample->tid, sample->ip, 725 sample->period, sample->addr); 726 727 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 728 callchain__printf(sample); 729 } 730 731 static int perf_session_deliver_event(struct perf_session *session, 732 union perf_event *event, 733 struct perf_sample *sample, 734 struct perf_event_ops *ops, 735 u64 file_offset) 736 { 737 struct perf_evsel *evsel; 738 739 dump_event(session, event, file_offset, sample); 740 741 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 742 if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) { 743 /* 744 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here 745 * because the tools right now may apply filters, discarding 746 * some of the samples. For consistency, in the future we 747 * should have something like nr_filtered_samples and remove 748 * the sample->period from total_sample_period, etc, KISS for 749 * now tho. 750 * 751 * Also testing against NULL allows us to handle files without 752 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the 753 * future probably it'll be a good idea to restrict event 754 * processing via perf_session to files with both set. 755 */ 756 hists__inc_nr_events(&evsel->hists, event->header.type); 757 } 758 759 switch (event->header.type) { 760 case PERF_RECORD_SAMPLE: 761 dump_sample(session, event, sample); 762 if (evsel == NULL) { 763 ++session->hists.stats.nr_unknown_id; 764 return -1; 765 } 766 return ops->sample(event, sample, evsel, session); 767 case PERF_RECORD_MMAP: 768 return ops->mmap(event, sample, session); 769 case PERF_RECORD_COMM: 770 return ops->comm(event, sample, session); 771 case PERF_RECORD_FORK: 772 return ops->fork(event, sample, session); 773 case PERF_RECORD_EXIT: 774 return ops->exit(event, sample, session); 775 case PERF_RECORD_LOST: 776 return ops->lost(event, sample, session); 777 case PERF_RECORD_READ: 778 return ops->read(event, sample, session); 779 case PERF_RECORD_THROTTLE: 780 return ops->throttle(event, sample, session); 781 case PERF_RECORD_UNTHROTTLE: 782 return ops->unthrottle(event, sample, session); 783 default: 784 ++session->hists.stats.nr_unknown_events; 785 return -1; 786 } 787 } 788 789 static int perf_session__preprocess_sample(struct perf_session *session, 790 union perf_event *event, struct perf_sample *sample) 791 { 792 if (event->header.type != PERF_RECORD_SAMPLE || 793 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 794 return 0; 795 796 if (!ip_callchain__valid(sample->callchain, event)) { 797 pr_debug("call-chain problem with event, skipping it.\n"); 798 ++session->hists.stats.nr_invalid_chains; 799 session->hists.stats.total_invalid_chains += sample->period; 800 return -EINVAL; 801 } 802 return 0; 803 } 804 805 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 806 struct perf_event_ops *ops, u64 file_offset) 807 { 808 dump_event(session, event, file_offset, NULL); 809 810 /* These events are processed right away */ 811 switch (event->header.type) { 812 case PERF_RECORD_HEADER_ATTR: 813 return ops->attr(event, session); 814 case PERF_RECORD_HEADER_EVENT_TYPE: 815 return ops->event_type(event, session); 816 case PERF_RECORD_HEADER_TRACING_DATA: 817 /* setup for reading amidst mmap */ 818 lseek(session->fd, file_offset, SEEK_SET); 819 return ops->tracing_data(event, session); 820 case PERF_RECORD_HEADER_BUILD_ID: 821 return ops->build_id(event, session); 822 case PERF_RECORD_FINISHED_ROUND: 823 return ops->finished_round(event, session, ops); 824 default: 825 return -EINVAL; 826 } 827 } 828 829 static int perf_session__process_event(struct perf_session *session, 830 union perf_event *event, 831 struct perf_event_ops *ops, 832 u64 file_offset) 833 { 834 struct perf_sample sample; 835 int ret; 836 837 if (session->header.needs_swap && 838 perf_event__swap_ops[event->header.type]) 839 perf_event__swap_ops[event->header.type](event); 840 841 if (event->header.type >= PERF_RECORD_HEADER_MAX) 842 return -EINVAL; 843 844 hists__inc_nr_events(&session->hists, event->header.type); 845 846 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 847 return perf_session__process_user_event(session, event, ops, file_offset); 848 849 /* 850 * For all kernel events we get the sample data 851 */ 852 ret = perf_session__parse_sample(session, event, &sample); 853 if (ret) 854 return ret; 855 856 /* Preprocess sample records - precheck callchains */ 857 if (perf_session__preprocess_sample(session, event, &sample)) 858 return 0; 859 860 if (ops->ordered_samples) { 861 ret = perf_session_queue_event(session, event, &sample, 862 file_offset); 863 if (ret != -ETIME) 864 return ret; 865 } 866 867 return perf_session_deliver_event(session, event, &sample, ops, 868 file_offset); 869 } 870 871 void perf_event_header__bswap(struct perf_event_header *self) 872 { 873 self->type = bswap_32(self->type); 874 self->misc = bswap_16(self->misc); 875 self->size = bswap_16(self->size); 876 } 877 878 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 879 { 880 struct thread *thread = perf_session__findnew(self, 0); 881 882 if (thread == NULL || thread__set_comm(thread, "swapper")) { 883 pr_err("problem inserting idle task.\n"); 884 thread = NULL; 885 } 886 887 return thread; 888 } 889 890 static void perf_session__warn_about_errors(const struct perf_session *session, 891 const struct perf_event_ops *ops) 892 { 893 if (ops->lost == perf_event__process_lost && 894 session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) { 895 ui__warning("Processed %d events and lost %d chunks!\n\n" 896 "Check IO/CPU overload!\n\n", 897 session->hists.stats.nr_events[0], 898 session->hists.stats.nr_events[PERF_RECORD_LOST]); 899 } 900 901 if (session->hists.stats.nr_unknown_events != 0) { 902 ui__warning("Found %u unknown events!\n\n" 903 "Is this an older tool processing a perf.data " 904 "file generated by a more recent tool?\n\n" 905 "If that is not the case, consider " 906 "reporting to linux-kernel@vger.kernel.org.\n\n", 907 session->hists.stats.nr_unknown_events); 908 } 909 910 if (session->hists.stats.nr_unknown_id != 0) { 911 ui__warning("%u samples with id not present in the header\n", 912 session->hists.stats.nr_unknown_id); 913 } 914 915 if (session->hists.stats.nr_invalid_chains != 0) { 916 ui__warning("Found invalid callchains!\n\n" 917 "%u out of %u events were discarded for this reason.\n\n" 918 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 919 session->hists.stats.nr_invalid_chains, 920 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 921 } 922 } 923 924 #define session_done() (*(volatile int *)(&session_done)) 925 volatile int session_done; 926 927 static int __perf_session__process_pipe_events(struct perf_session *self, 928 struct perf_event_ops *ops) 929 { 930 union perf_event event; 931 uint32_t size; 932 int skip = 0; 933 u64 head; 934 int err; 935 void *p; 936 937 perf_event_ops__fill_defaults(ops); 938 939 head = 0; 940 more: 941 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 942 if (err <= 0) { 943 if (err == 0) 944 goto done; 945 946 pr_err("failed to read event header\n"); 947 goto out_err; 948 } 949 950 if (self->header.needs_swap) 951 perf_event_header__bswap(&event.header); 952 953 size = event.header.size; 954 if (size == 0) 955 size = 8; 956 957 p = &event; 958 p += sizeof(struct perf_event_header); 959 960 if (size - sizeof(struct perf_event_header)) { 961 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 962 if (err <= 0) { 963 if (err == 0) { 964 pr_err("unexpected end of event stream\n"); 965 goto done; 966 } 967 968 pr_err("failed to read event data\n"); 969 goto out_err; 970 } 971 } 972 973 if (size == 0 || 974 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 975 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 976 head, event.header.size, event.header.type); 977 /* 978 * assume we lost track of the stream, check alignment, and 979 * increment a single u64 in the hope to catch on again 'soon'. 980 */ 981 if (unlikely(head & 7)) 982 head &= ~7ULL; 983 984 size = 8; 985 } 986 987 head += size; 988 989 if (skip > 0) 990 head += skip; 991 992 if (!session_done()) 993 goto more; 994 done: 995 err = 0; 996 out_err: 997 perf_session__warn_about_errors(self, ops); 998 perf_session_free_sample_buffers(self); 999 return err; 1000 } 1001 1002 static union perf_event * 1003 fetch_mmaped_event(struct perf_session *session, 1004 u64 head, size_t mmap_size, char *buf) 1005 { 1006 union perf_event *event; 1007 1008 /* 1009 * Ensure we have enough space remaining to read 1010 * the size of the event in the headers. 1011 */ 1012 if (head + sizeof(event->header) > mmap_size) 1013 return NULL; 1014 1015 event = (union perf_event *)(buf + head); 1016 1017 if (session->header.needs_swap) 1018 perf_event_header__bswap(&event->header); 1019 1020 if (head + event->header.size > mmap_size) 1021 return NULL; 1022 1023 return event; 1024 } 1025 1026 int __perf_session__process_events(struct perf_session *session, 1027 u64 data_offset, u64 data_size, 1028 u64 file_size, struct perf_event_ops *ops) 1029 { 1030 u64 head, page_offset, file_offset, file_pos, progress_next; 1031 int err, mmap_prot, mmap_flags, map_idx = 0; 1032 size_t page_size, mmap_size; 1033 char *buf, *mmaps[8]; 1034 union perf_event *event; 1035 uint32_t size; 1036 1037 perf_event_ops__fill_defaults(ops); 1038 1039 page_size = sysconf(_SC_PAGESIZE); 1040 1041 page_offset = page_size * (data_offset / page_size); 1042 file_offset = page_offset; 1043 head = data_offset - page_offset; 1044 1045 if (data_offset + data_size < file_size) 1046 file_size = data_offset + data_size; 1047 1048 progress_next = file_size / 16; 1049 1050 mmap_size = session->mmap_window; 1051 if (mmap_size > file_size) 1052 mmap_size = file_size; 1053 1054 memset(mmaps, 0, sizeof(mmaps)); 1055 1056 mmap_prot = PROT_READ; 1057 mmap_flags = MAP_SHARED; 1058 1059 if (session->header.needs_swap) { 1060 mmap_prot |= PROT_WRITE; 1061 mmap_flags = MAP_PRIVATE; 1062 } 1063 remap: 1064 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1065 file_offset); 1066 if (buf == MAP_FAILED) { 1067 pr_err("failed to mmap file\n"); 1068 err = -errno; 1069 goto out_err; 1070 } 1071 mmaps[map_idx] = buf; 1072 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1073 file_pos = file_offset + head; 1074 1075 more: 1076 event = fetch_mmaped_event(session, head, mmap_size, buf); 1077 if (!event) { 1078 if (mmaps[map_idx]) { 1079 munmap(mmaps[map_idx], mmap_size); 1080 mmaps[map_idx] = NULL; 1081 } 1082 1083 page_offset = page_size * (head / page_size); 1084 file_offset += page_offset; 1085 head -= page_offset; 1086 goto remap; 1087 } 1088 1089 size = event->header.size; 1090 1091 if (size == 0 || 1092 perf_session__process_event(session, event, ops, file_pos) < 0) { 1093 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1094 file_offset + head, event->header.size, 1095 event->header.type); 1096 /* 1097 * assume we lost track of the stream, check alignment, and 1098 * increment a single u64 in the hope to catch on again 'soon'. 1099 */ 1100 if (unlikely(head & 7)) 1101 head &= ~7ULL; 1102 1103 size = 8; 1104 } 1105 1106 head += size; 1107 file_pos += size; 1108 1109 if (file_pos >= progress_next) { 1110 progress_next += file_size / 16; 1111 ui_progress__update(file_pos, file_size, 1112 "Processing events..."); 1113 } 1114 1115 if (file_pos < file_size) 1116 goto more; 1117 1118 err = 0; 1119 /* do the final flush for ordered samples */ 1120 session->ordered_samples.next_flush = ULLONG_MAX; 1121 flush_sample_queue(session, ops); 1122 out_err: 1123 perf_session__warn_about_errors(session, ops); 1124 perf_session_free_sample_buffers(session); 1125 return err; 1126 } 1127 1128 int perf_session__process_events(struct perf_session *self, 1129 struct perf_event_ops *ops) 1130 { 1131 int err; 1132 1133 if (perf_session__register_idle_thread(self) == NULL) 1134 return -ENOMEM; 1135 1136 if (!self->fd_pipe) 1137 err = __perf_session__process_events(self, 1138 self->header.data_offset, 1139 self->header.data_size, 1140 self->size, ops); 1141 else 1142 err = __perf_session__process_pipe_events(self, ops); 1143 1144 return err; 1145 } 1146 1147 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1148 { 1149 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1150 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1151 return false; 1152 } 1153 1154 return true; 1155 } 1156 1157 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1158 const char *symbol_name, 1159 u64 addr) 1160 { 1161 char *bracket; 1162 enum map_type i; 1163 struct ref_reloc_sym *ref; 1164 1165 ref = zalloc(sizeof(struct ref_reloc_sym)); 1166 if (ref == NULL) 1167 return -ENOMEM; 1168 1169 ref->name = strdup(symbol_name); 1170 if (ref->name == NULL) { 1171 free(ref); 1172 return -ENOMEM; 1173 } 1174 1175 bracket = strchr(ref->name, ']'); 1176 if (bracket) 1177 *bracket = '\0'; 1178 1179 ref->addr = addr; 1180 1181 for (i = 0; i < MAP__NR_TYPES; ++i) { 1182 struct kmap *kmap = map__kmap(maps[i]); 1183 kmap->ref_reloc_sym = ref; 1184 } 1185 1186 return 0; 1187 } 1188 1189 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1190 { 1191 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1192 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1193 machines__fprintf_dsos(&self->machines, fp); 1194 } 1195 1196 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1197 bool with_hits) 1198 { 1199 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1200 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1201 } 1202 1203 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1204 { 1205 struct perf_evsel *pos; 1206 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1207 1208 ret += hists__fprintf_nr_events(&session->hists, fp); 1209 1210 list_for_each_entry(pos, &session->evlist->entries, node) { 1211 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1212 ret += hists__fprintf_nr_events(&pos->hists, fp); 1213 } 1214 1215 return ret; 1216 } 1217 1218 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1219 unsigned int type) 1220 { 1221 struct perf_evsel *pos; 1222 1223 list_for_each_entry(pos, &session->evlist->entries, node) { 1224 if (pos->attr.type == type) 1225 return pos; 1226 } 1227 return NULL; 1228 } 1229 1230 void perf_session__print_ip(union perf_event *event, 1231 struct perf_sample *sample, 1232 struct perf_session *session, 1233 int print_sym, int print_dso) 1234 { 1235 struct addr_location al; 1236 const char *symname, *dsoname; 1237 struct callchain_cursor *cursor = &session->callchain_cursor; 1238 struct callchain_cursor_node *node; 1239 1240 if (perf_event__preprocess_sample(event, session, &al, sample, 1241 NULL) < 0) { 1242 error("problem processing %d event, skipping it.\n", 1243 event->header.type); 1244 return; 1245 } 1246 1247 if (symbol_conf.use_callchain && sample->callchain) { 1248 1249 if (perf_session__resolve_callchain(session, al.thread, 1250 sample->callchain, NULL) != 0) { 1251 if (verbose) 1252 error("Failed to resolve callchain. Skipping\n"); 1253 return; 1254 } 1255 callchain_cursor_commit(cursor); 1256 1257 while (1) { 1258 node = callchain_cursor_current(cursor); 1259 if (!node) 1260 break; 1261 1262 printf("\t%16" PRIx64, node->ip); 1263 if (print_sym) { 1264 if (node->sym && node->sym->name) 1265 symname = node->sym->name; 1266 else 1267 symname = ""; 1268 1269 printf(" %s", symname); 1270 } 1271 if (print_dso) { 1272 if (node->map && node->map->dso && node->map->dso->name) 1273 dsoname = node->map->dso->name; 1274 else 1275 dsoname = ""; 1276 1277 printf(" (%s)", dsoname); 1278 } 1279 printf("\n"); 1280 1281 callchain_cursor_advance(cursor); 1282 } 1283 1284 } else { 1285 printf("%16" PRIx64, sample->ip); 1286 if (print_sym) { 1287 if (al.sym && al.sym->name) 1288 symname = al.sym->name; 1289 else 1290 symname = ""; 1291 1292 printf(" %s", symname); 1293 } 1294 1295 if (print_dso) { 1296 if (al.map && al.map->dso && al.map->dso->name) 1297 dsoname = al.map->dso->name; 1298 else 1299 dsoname = ""; 1300 1301 printf(" (%s)", dsoname); 1302 } 1303 } 1304 } 1305 1306 int perf_session__cpu_bitmap(struct perf_session *session, 1307 const char *cpu_list, unsigned long *cpu_bitmap) 1308 { 1309 int i; 1310 struct cpu_map *map; 1311 1312 for (i = 0; i < PERF_TYPE_MAX; ++i) { 1313 struct perf_evsel *evsel; 1314 1315 evsel = perf_session__find_first_evtype(session, i); 1316 if (!evsel) 1317 continue; 1318 1319 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) { 1320 pr_err("File does not contain CPU events. " 1321 "Remove -c option to proceed.\n"); 1322 return -1; 1323 } 1324 } 1325 1326 map = cpu_map__new(cpu_list); 1327 1328 for (i = 0; i < map->nr; i++) { 1329 int cpu = map->map[i]; 1330 1331 if (cpu >= MAX_NR_CPUS) { 1332 pr_err("Requested CPU %d too large. " 1333 "Consider raising MAX_NR_CPUS\n", cpu); 1334 return -1; 1335 } 1336 1337 set_bit(cpu, cpu_bitmap); 1338 } 1339 1340 return 0; 1341 } 1342 1343 void perf_session__fprintf_info(struct perf_session *session, FILE *fp, 1344 bool full) 1345 { 1346 struct stat st; 1347 int ret; 1348 1349 if (session == NULL || fp == NULL) 1350 return; 1351 1352 ret = fstat(session->fd, &st); 1353 if (ret == -1) 1354 return; 1355 1356 fprintf(fp, "# ========\n"); 1357 fprintf(fp, "# captured on: %s", ctime(&st.st_ctime)); 1358 perf_header__fprintf_info(session, fp, full); 1359 fprintf(fp, "# ========\n#\n"); 1360 } 1361