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 16 static int perf_session__open(struct perf_session *self, bool force) 17 { 18 struct stat input_stat; 19 20 if (!strcmp(self->filename, "-")) { 21 self->fd_pipe = true; 22 self->fd = STDIN_FILENO; 23 24 if (perf_session__read_header(self, self->fd) < 0) 25 pr_err("incompatible file format"); 26 27 return 0; 28 } 29 30 self->fd = open(self->filename, O_RDONLY); 31 if (self->fd < 0) { 32 int err = errno; 33 34 pr_err("failed to open %s: %s", self->filename, strerror(err)); 35 if (err == ENOENT && !strcmp(self->filename, "perf.data")) 36 pr_err(" (try 'perf record' first)"); 37 pr_err("\n"); 38 return -errno; 39 } 40 41 if (fstat(self->fd, &input_stat) < 0) 42 goto out_close; 43 44 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 45 pr_err("file %s not owned by current user or root\n", 46 self->filename); 47 goto out_close; 48 } 49 50 if (!input_stat.st_size) { 51 pr_info("zero-sized file (%s), nothing to do!\n", 52 self->filename); 53 goto out_close; 54 } 55 56 if (perf_session__read_header(self, self->fd) < 0) { 57 pr_err("incompatible file format"); 58 goto out_close; 59 } 60 61 self->size = input_stat.st_size; 62 return 0; 63 64 out_close: 65 close(self->fd); 66 self->fd = -1; 67 return -1; 68 } 69 70 static void perf_session__id_header_size(struct perf_session *session) 71 { 72 struct perf_sample *data; 73 u64 sample_type = session->sample_type; 74 u16 size = 0; 75 76 if (!session->sample_id_all) 77 goto out; 78 79 if (sample_type & PERF_SAMPLE_TID) 80 size += sizeof(data->tid) * 2; 81 82 if (sample_type & PERF_SAMPLE_TIME) 83 size += sizeof(data->time); 84 85 if (sample_type & PERF_SAMPLE_ID) 86 size += sizeof(data->id); 87 88 if (sample_type & PERF_SAMPLE_STREAM_ID) 89 size += sizeof(data->stream_id); 90 91 if (sample_type & PERF_SAMPLE_CPU) 92 size += sizeof(data->cpu) * 2; 93 out: 94 session->id_hdr_size = size; 95 } 96 97 void perf_session__update_sample_type(struct perf_session *self) 98 { 99 self->sample_type = perf_evlist__sample_type(self->evlist); 100 self->sample_id_all = perf_evlist__sample_id_all(self->evlist); 101 perf_session__id_header_size(self); 102 } 103 104 int perf_session__create_kernel_maps(struct perf_session *self) 105 { 106 int ret = machine__create_kernel_maps(&self->host_machine); 107 108 if (ret >= 0) 109 ret = machines__create_guest_kernel_maps(&self->machines); 110 return ret; 111 } 112 113 static void perf_session__destroy_kernel_maps(struct perf_session *self) 114 { 115 machine__destroy_kernel_maps(&self->host_machine); 116 machines__destroy_guest_kernel_maps(&self->machines); 117 } 118 119 struct perf_session *perf_session__new(const char *filename, int mode, 120 bool force, bool repipe, 121 struct perf_event_ops *ops) 122 { 123 size_t len = filename ? strlen(filename) + 1 : 0; 124 struct perf_session *self = zalloc(sizeof(*self) + len); 125 126 if (self == NULL) 127 goto out; 128 129 memcpy(self->filename, filename, len); 130 self->threads = RB_ROOT; 131 INIT_LIST_HEAD(&self->dead_threads); 132 self->last_match = NULL; 133 /* 134 * On 64bit we can mmap the data file in one go. No need for tiny mmap 135 * slices. On 32bit we use 32MB. 136 */ 137 #if BITS_PER_LONG == 64 138 self->mmap_window = ULLONG_MAX; 139 #else 140 self->mmap_window = 32 * 1024 * 1024ULL; 141 #endif 142 self->machines = RB_ROOT; 143 self->repipe = repipe; 144 INIT_LIST_HEAD(&self->ordered_samples.samples); 145 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 146 INIT_LIST_HEAD(&self->ordered_samples.to_free); 147 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 148 149 if (mode == O_RDONLY) { 150 if (perf_session__open(self, force) < 0) 151 goto out_delete; 152 perf_session__update_sample_type(self); 153 } else if (mode == O_WRONLY) { 154 /* 155 * In O_RDONLY mode this will be performed when reading the 156 * kernel MMAP event, in perf_event__process_mmap(). 157 */ 158 if (perf_session__create_kernel_maps(self) < 0) 159 goto out_delete; 160 } 161 162 if (ops && ops->ordering_requires_timestamps && 163 ops->ordered_samples && !self->sample_id_all) { 164 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 165 ops->ordered_samples = false; 166 } 167 168 out: 169 return self; 170 out_delete: 171 perf_session__delete(self); 172 return NULL; 173 } 174 175 static void perf_session__delete_dead_threads(struct perf_session *self) 176 { 177 struct thread *n, *t; 178 179 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 180 list_del(&t->node); 181 thread__delete(t); 182 } 183 } 184 185 static void perf_session__delete_threads(struct perf_session *self) 186 { 187 struct rb_node *nd = rb_first(&self->threads); 188 189 while (nd) { 190 struct thread *t = rb_entry(nd, struct thread, rb_node); 191 192 rb_erase(&t->rb_node, &self->threads); 193 nd = rb_next(nd); 194 thread__delete(t); 195 } 196 } 197 198 void perf_session__delete(struct perf_session *self) 199 { 200 perf_session__destroy_kernel_maps(self); 201 perf_session__delete_dead_threads(self); 202 perf_session__delete_threads(self); 203 machine__exit(&self->host_machine); 204 close(self->fd); 205 free(self); 206 } 207 208 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 209 { 210 self->last_match = NULL; 211 rb_erase(&th->rb_node, &self->threads); 212 /* 213 * We may have references to this thread, for instance in some hist_entry 214 * instances, so just move them to a separate list. 215 */ 216 list_add_tail(&th->node, &self->dead_threads); 217 } 218 219 static bool symbol__match_parent_regex(struct symbol *sym) 220 { 221 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 222 return 1; 223 224 return 0; 225 } 226 227 int perf_session__resolve_callchain(struct perf_session *self, 228 struct thread *thread, 229 struct ip_callchain *chain, 230 struct symbol **parent) 231 { 232 u8 cpumode = PERF_RECORD_MISC_USER; 233 unsigned int i; 234 int err; 235 236 callchain_cursor_reset(&self->callchain_cursor); 237 238 for (i = 0; i < chain->nr; i++) { 239 u64 ip = chain->ips[i]; 240 struct addr_location al; 241 242 if (ip >= PERF_CONTEXT_MAX) { 243 switch (ip) { 244 case PERF_CONTEXT_HV: 245 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 246 case PERF_CONTEXT_KERNEL: 247 cpumode = PERF_RECORD_MISC_KERNEL; break; 248 case PERF_CONTEXT_USER: 249 cpumode = PERF_RECORD_MISC_USER; break; 250 default: 251 break; 252 } 253 continue; 254 } 255 256 al.filtered = false; 257 thread__find_addr_location(thread, self, cpumode, 258 MAP__FUNCTION, thread->pid, ip, &al, NULL); 259 if (al.sym != NULL) { 260 if (sort__has_parent && !*parent && 261 symbol__match_parent_regex(al.sym)) 262 *parent = al.sym; 263 if (!symbol_conf.use_callchain) 264 break; 265 } 266 267 err = callchain_cursor_append(&self->callchain_cursor, 268 ip, al.map, al.sym); 269 if (err) 270 return err; 271 } 272 273 return 0; 274 } 275 276 static int process_event_synth_stub(union perf_event *event __used, 277 struct perf_session *session __used) 278 { 279 dump_printf(": unhandled!\n"); 280 return 0; 281 } 282 283 static int process_event_sample_stub(union perf_event *event __used, 284 struct perf_sample *sample __used, 285 struct perf_evsel *evsel __used, 286 struct perf_session *session __used) 287 { 288 dump_printf(": unhandled!\n"); 289 return 0; 290 } 291 292 static int process_event_stub(union perf_event *event __used, 293 struct perf_sample *sample __used, 294 struct perf_session *session __used) 295 { 296 dump_printf(": unhandled!\n"); 297 return 0; 298 } 299 300 static int process_finished_round_stub(union perf_event *event __used, 301 struct perf_session *session __used, 302 struct perf_event_ops *ops __used) 303 { 304 dump_printf(": unhandled!\n"); 305 return 0; 306 } 307 308 static int process_finished_round(union perf_event *event, 309 struct perf_session *session, 310 struct perf_event_ops *ops); 311 312 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 313 { 314 if (handler->sample == NULL) 315 handler->sample = process_event_sample_stub; 316 if (handler->mmap == NULL) 317 handler->mmap = process_event_stub; 318 if (handler->comm == NULL) 319 handler->comm = process_event_stub; 320 if (handler->fork == NULL) 321 handler->fork = process_event_stub; 322 if (handler->exit == NULL) 323 handler->exit = process_event_stub; 324 if (handler->lost == NULL) 325 handler->lost = perf_event__process_lost; 326 if (handler->read == NULL) 327 handler->read = process_event_stub; 328 if (handler->throttle == NULL) 329 handler->throttle = process_event_stub; 330 if (handler->unthrottle == NULL) 331 handler->unthrottle = process_event_stub; 332 if (handler->attr == NULL) 333 handler->attr = process_event_synth_stub; 334 if (handler->event_type == NULL) 335 handler->event_type = process_event_synth_stub; 336 if (handler->tracing_data == NULL) 337 handler->tracing_data = process_event_synth_stub; 338 if (handler->build_id == NULL) 339 handler->build_id = process_event_synth_stub; 340 if (handler->finished_round == NULL) { 341 if (handler->ordered_samples) 342 handler->finished_round = process_finished_round; 343 else 344 handler->finished_round = process_finished_round_stub; 345 } 346 } 347 348 void mem_bswap_64(void *src, int byte_size) 349 { 350 u64 *m = src; 351 352 while (byte_size > 0) { 353 *m = bswap_64(*m); 354 byte_size -= sizeof(u64); 355 ++m; 356 } 357 } 358 359 static void perf_event__all64_swap(union perf_event *event) 360 { 361 struct perf_event_header *hdr = &event->header; 362 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 363 } 364 365 static void perf_event__comm_swap(union perf_event *event) 366 { 367 event->comm.pid = bswap_32(event->comm.pid); 368 event->comm.tid = bswap_32(event->comm.tid); 369 } 370 371 static void perf_event__mmap_swap(union perf_event *event) 372 { 373 event->mmap.pid = bswap_32(event->mmap.pid); 374 event->mmap.tid = bswap_32(event->mmap.tid); 375 event->mmap.start = bswap_64(event->mmap.start); 376 event->mmap.len = bswap_64(event->mmap.len); 377 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 378 } 379 380 static void perf_event__task_swap(union perf_event *event) 381 { 382 event->fork.pid = bswap_32(event->fork.pid); 383 event->fork.tid = bswap_32(event->fork.tid); 384 event->fork.ppid = bswap_32(event->fork.ppid); 385 event->fork.ptid = bswap_32(event->fork.ptid); 386 event->fork.time = bswap_64(event->fork.time); 387 } 388 389 static void perf_event__read_swap(union perf_event *event) 390 { 391 event->read.pid = bswap_32(event->read.pid); 392 event->read.tid = bswap_32(event->read.tid); 393 event->read.value = bswap_64(event->read.value); 394 event->read.time_enabled = bswap_64(event->read.time_enabled); 395 event->read.time_running = bswap_64(event->read.time_running); 396 event->read.id = bswap_64(event->read.id); 397 } 398 399 static void perf_event__attr_swap(union perf_event *event) 400 { 401 size_t size; 402 403 event->attr.attr.type = bswap_32(event->attr.attr.type); 404 event->attr.attr.size = bswap_32(event->attr.attr.size); 405 event->attr.attr.config = bswap_64(event->attr.attr.config); 406 event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period); 407 event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type); 408 event->attr.attr.read_format = bswap_64(event->attr.attr.read_format); 409 event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events); 410 event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type); 411 event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr); 412 event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len); 413 414 size = event->header.size; 415 size -= (void *)&event->attr.id - (void *)event; 416 mem_bswap_64(event->attr.id, size); 417 } 418 419 static void perf_event__event_type_swap(union perf_event *event) 420 { 421 event->event_type.event_type.event_id = 422 bswap_64(event->event_type.event_type.event_id); 423 } 424 425 static void perf_event__tracing_data_swap(union perf_event *event) 426 { 427 event->tracing_data.size = bswap_32(event->tracing_data.size); 428 } 429 430 typedef void (*perf_event__swap_op)(union perf_event *event); 431 432 static perf_event__swap_op perf_event__swap_ops[] = { 433 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 434 [PERF_RECORD_COMM] = perf_event__comm_swap, 435 [PERF_RECORD_FORK] = perf_event__task_swap, 436 [PERF_RECORD_EXIT] = perf_event__task_swap, 437 [PERF_RECORD_LOST] = perf_event__all64_swap, 438 [PERF_RECORD_READ] = perf_event__read_swap, 439 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 440 [PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap, 441 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 442 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 443 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 444 [PERF_RECORD_HEADER_MAX] = NULL, 445 }; 446 447 struct sample_queue { 448 u64 timestamp; 449 u64 file_offset; 450 union perf_event *event; 451 struct list_head list; 452 }; 453 454 static void perf_session_free_sample_buffers(struct perf_session *session) 455 { 456 struct ordered_samples *os = &session->ordered_samples; 457 458 while (!list_empty(&os->to_free)) { 459 struct sample_queue *sq; 460 461 sq = list_entry(os->to_free.next, struct sample_queue, list); 462 list_del(&sq->list); 463 free(sq); 464 } 465 } 466 467 static int perf_session_deliver_event(struct perf_session *session, 468 union perf_event *event, 469 struct perf_sample *sample, 470 struct perf_event_ops *ops, 471 u64 file_offset); 472 473 static void flush_sample_queue(struct perf_session *s, 474 struct perf_event_ops *ops) 475 { 476 struct ordered_samples *os = &s->ordered_samples; 477 struct list_head *head = &os->samples; 478 struct sample_queue *tmp, *iter; 479 struct perf_sample sample; 480 u64 limit = os->next_flush; 481 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 482 483 if (!ops->ordered_samples || !limit) 484 return; 485 486 list_for_each_entry_safe(iter, tmp, head, list) { 487 if (iter->timestamp > limit) 488 break; 489 490 perf_session__parse_sample(s, iter->event, &sample); 491 perf_session_deliver_event(s, iter->event, &sample, ops, 492 iter->file_offset); 493 494 os->last_flush = iter->timestamp; 495 list_del(&iter->list); 496 list_add(&iter->list, &os->sample_cache); 497 } 498 499 if (list_empty(head)) { 500 os->last_sample = NULL; 501 } else if (last_ts <= limit) { 502 os->last_sample = 503 list_entry(head->prev, struct sample_queue, list); 504 } 505 } 506 507 /* 508 * When perf record finishes a pass on every buffers, it records this pseudo 509 * event. 510 * We record the max timestamp t found in the pass n. 511 * Assuming these timestamps are monotonic across cpus, we know that if 512 * a buffer still has events with timestamps below t, they will be all 513 * available and then read in the pass n + 1. 514 * Hence when we start to read the pass n + 2, we can safely flush every 515 * events with timestamps below t. 516 * 517 * ============ PASS n ================= 518 * CPU 0 | CPU 1 519 * | 520 * cnt1 timestamps | cnt2 timestamps 521 * 1 | 2 522 * 2 | 3 523 * - | 4 <--- max recorded 524 * 525 * ============ PASS n + 1 ============== 526 * CPU 0 | CPU 1 527 * | 528 * cnt1 timestamps | cnt2 timestamps 529 * 3 | 5 530 * 4 | 6 531 * 5 | 7 <---- max recorded 532 * 533 * Flush every events below timestamp 4 534 * 535 * ============ PASS n + 2 ============== 536 * CPU 0 | CPU 1 537 * | 538 * cnt1 timestamps | cnt2 timestamps 539 * 6 | 8 540 * 7 | 9 541 * - | 10 542 * 543 * Flush every events below timestamp 7 544 * etc... 545 */ 546 static int process_finished_round(union perf_event *event __used, 547 struct perf_session *session, 548 struct perf_event_ops *ops) 549 { 550 flush_sample_queue(session, ops); 551 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 552 553 return 0; 554 } 555 556 /* The queue is ordered by time */ 557 static void __queue_event(struct sample_queue *new, struct perf_session *s) 558 { 559 struct ordered_samples *os = &s->ordered_samples; 560 struct sample_queue *sample = os->last_sample; 561 u64 timestamp = new->timestamp; 562 struct list_head *p; 563 564 os->last_sample = new; 565 566 if (!sample) { 567 list_add(&new->list, &os->samples); 568 os->max_timestamp = timestamp; 569 return; 570 } 571 572 /* 573 * last_sample might point to some random place in the list as it's 574 * the last queued event. We expect that the new event is close to 575 * this. 576 */ 577 if (sample->timestamp <= timestamp) { 578 while (sample->timestamp <= timestamp) { 579 p = sample->list.next; 580 if (p == &os->samples) { 581 list_add_tail(&new->list, &os->samples); 582 os->max_timestamp = timestamp; 583 return; 584 } 585 sample = list_entry(p, struct sample_queue, list); 586 } 587 list_add_tail(&new->list, &sample->list); 588 } else { 589 while (sample->timestamp > timestamp) { 590 p = sample->list.prev; 591 if (p == &os->samples) { 592 list_add(&new->list, &os->samples); 593 return; 594 } 595 sample = list_entry(p, struct sample_queue, list); 596 } 597 list_add(&new->list, &sample->list); 598 } 599 } 600 601 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 602 603 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 604 struct perf_sample *sample, u64 file_offset) 605 { 606 struct ordered_samples *os = &s->ordered_samples; 607 struct list_head *sc = &os->sample_cache; 608 u64 timestamp = sample->time; 609 struct sample_queue *new; 610 611 if (!timestamp || timestamp == ~0ULL) 612 return -ETIME; 613 614 if (timestamp < s->ordered_samples.last_flush) { 615 printf("Warning: Timestamp below last timeslice flush\n"); 616 return -EINVAL; 617 } 618 619 if (!list_empty(sc)) { 620 new = list_entry(sc->next, struct sample_queue, list); 621 list_del(&new->list); 622 } else if (os->sample_buffer) { 623 new = os->sample_buffer + os->sample_buffer_idx; 624 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 625 os->sample_buffer = NULL; 626 } else { 627 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 628 if (!os->sample_buffer) 629 return -ENOMEM; 630 list_add(&os->sample_buffer->list, &os->to_free); 631 os->sample_buffer_idx = 2; 632 new = os->sample_buffer + 1; 633 } 634 635 new->timestamp = timestamp; 636 new->file_offset = file_offset; 637 new->event = event; 638 639 __queue_event(new, s); 640 641 return 0; 642 } 643 644 static void callchain__printf(struct perf_sample *sample) 645 { 646 unsigned int i; 647 648 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 649 650 for (i = 0; i < sample->callchain->nr; i++) 651 printf("..... %2d: %016" PRIx64 "\n", 652 i, sample->callchain->ips[i]); 653 } 654 655 static void perf_session__print_tstamp(struct perf_session *session, 656 union perf_event *event, 657 struct perf_sample *sample) 658 { 659 if (event->header.type != PERF_RECORD_SAMPLE && 660 !session->sample_id_all) { 661 fputs("-1 -1 ", stdout); 662 return; 663 } 664 665 if ((session->sample_type & PERF_SAMPLE_CPU)) 666 printf("%u ", sample->cpu); 667 668 if (session->sample_type & PERF_SAMPLE_TIME) 669 printf("%" PRIu64 " ", sample->time); 670 } 671 672 static void dump_event(struct perf_session *session, union perf_event *event, 673 u64 file_offset, struct perf_sample *sample) 674 { 675 if (!dump_trace) 676 return; 677 678 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 679 file_offset, event->header.size, event->header.type); 680 681 trace_event(event); 682 683 if (sample) 684 perf_session__print_tstamp(session, event, sample); 685 686 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 687 event->header.size, perf_event__name(event->header.type)); 688 } 689 690 static void dump_sample(struct perf_session *session, union perf_event *event, 691 struct perf_sample *sample) 692 { 693 if (!dump_trace) 694 return; 695 696 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n", 697 event->header.misc, sample->pid, sample->tid, sample->ip, 698 sample->period); 699 700 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 701 callchain__printf(sample); 702 } 703 704 static int perf_session_deliver_event(struct perf_session *session, 705 union perf_event *event, 706 struct perf_sample *sample, 707 struct perf_event_ops *ops, 708 u64 file_offset) 709 { 710 struct perf_evsel *evsel; 711 712 dump_event(session, event, file_offset, sample); 713 714 switch (event->header.type) { 715 case PERF_RECORD_SAMPLE: 716 dump_sample(session, event, sample); 717 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 718 if (evsel == NULL) { 719 ++session->hists.stats.nr_unknown_id; 720 return -1; 721 } 722 return ops->sample(event, sample, evsel, session); 723 case PERF_RECORD_MMAP: 724 return ops->mmap(event, sample, session); 725 case PERF_RECORD_COMM: 726 return ops->comm(event, sample, session); 727 case PERF_RECORD_FORK: 728 return ops->fork(event, sample, session); 729 case PERF_RECORD_EXIT: 730 return ops->exit(event, sample, session); 731 case PERF_RECORD_LOST: 732 return ops->lost(event, sample, session); 733 case PERF_RECORD_READ: 734 return ops->read(event, sample, session); 735 case PERF_RECORD_THROTTLE: 736 return ops->throttle(event, sample, session); 737 case PERF_RECORD_UNTHROTTLE: 738 return ops->unthrottle(event, sample, session); 739 default: 740 ++session->hists.stats.nr_unknown_events; 741 return -1; 742 } 743 } 744 745 static int perf_session__preprocess_sample(struct perf_session *session, 746 union perf_event *event, struct perf_sample *sample) 747 { 748 if (event->header.type != PERF_RECORD_SAMPLE || 749 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 750 return 0; 751 752 if (!ip_callchain__valid(sample->callchain, event)) { 753 pr_debug("call-chain problem with event, skipping it.\n"); 754 ++session->hists.stats.nr_invalid_chains; 755 session->hists.stats.total_invalid_chains += sample->period; 756 return -EINVAL; 757 } 758 return 0; 759 } 760 761 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 762 struct perf_event_ops *ops, u64 file_offset) 763 { 764 dump_event(session, event, file_offset, NULL); 765 766 /* These events are processed right away */ 767 switch (event->header.type) { 768 case PERF_RECORD_HEADER_ATTR: 769 return ops->attr(event, session); 770 case PERF_RECORD_HEADER_EVENT_TYPE: 771 return ops->event_type(event, session); 772 case PERF_RECORD_HEADER_TRACING_DATA: 773 /* setup for reading amidst mmap */ 774 lseek(session->fd, file_offset, SEEK_SET); 775 return ops->tracing_data(event, session); 776 case PERF_RECORD_HEADER_BUILD_ID: 777 return ops->build_id(event, session); 778 case PERF_RECORD_FINISHED_ROUND: 779 return ops->finished_round(event, session, ops); 780 default: 781 return -EINVAL; 782 } 783 } 784 785 static int perf_session__process_event(struct perf_session *session, 786 union perf_event *event, 787 struct perf_event_ops *ops, 788 u64 file_offset) 789 { 790 struct perf_sample sample; 791 int ret; 792 793 if (session->header.needs_swap && 794 perf_event__swap_ops[event->header.type]) 795 perf_event__swap_ops[event->header.type](event); 796 797 if (event->header.type >= PERF_RECORD_HEADER_MAX) 798 return -EINVAL; 799 800 hists__inc_nr_events(&session->hists, event->header.type); 801 802 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 803 return perf_session__process_user_event(session, event, ops, file_offset); 804 805 /* 806 * For all kernel events we get the sample data 807 */ 808 perf_session__parse_sample(session, event, &sample); 809 810 /* Preprocess sample records - precheck callchains */ 811 if (perf_session__preprocess_sample(session, event, &sample)) 812 return 0; 813 814 if (ops->ordered_samples) { 815 ret = perf_session_queue_event(session, event, &sample, 816 file_offset); 817 if (ret != -ETIME) 818 return ret; 819 } 820 821 return perf_session_deliver_event(session, event, &sample, ops, 822 file_offset); 823 } 824 825 void perf_event_header__bswap(struct perf_event_header *self) 826 { 827 self->type = bswap_32(self->type); 828 self->misc = bswap_16(self->misc); 829 self->size = bswap_16(self->size); 830 } 831 832 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 833 { 834 struct thread *thread = perf_session__findnew(self, 0); 835 836 if (thread == NULL || thread__set_comm(thread, "swapper")) { 837 pr_err("problem inserting idle task.\n"); 838 thread = NULL; 839 } 840 841 return thread; 842 } 843 844 static void perf_session__warn_about_errors(const struct perf_session *session, 845 const struct perf_event_ops *ops) 846 { 847 if (ops->lost == perf_event__process_lost && 848 session->hists.stats.total_lost != 0) { 849 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64 850 "!\n\nCheck IO/CPU overload!\n\n", 851 session->hists.stats.total_period, 852 session->hists.stats.total_lost); 853 } 854 855 if (session->hists.stats.nr_unknown_events != 0) { 856 ui__warning("Found %u unknown events!\n\n" 857 "Is this an older tool processing a perf.data " 858 "file generated by a more recent tool?\n\n" 859 "If that is not the case, consider " 860 "reporting to linux-kernel@vger.kernel.org.\n\n", 861 session->hists.stats.nr_unknown_events); 862 } 863 864 if (session->hists.stats.nr_unknown_id != 0) { 865 ui__warning("%u samples with id not present in the header\n", 866 session->hists.stats.nr_unknown_id); 867 } 868 869 if (session->hists.stats.nr_invalid_chains != 0) { 870 ui__warning("Found invalid callchains!\n\n" 871 "%u out of %u events were discarded for this reason.\n\n" 872 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 873 session->hists.stats.nr_invalid_chains, 874 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 875 } 876 } 877 878 #define session_done() (*(volatile int *)(&session_done)) 879 volatile int session_done; 880 881 static int __perf_session__process_pipe_events(struct perf_session *self, 882 struct perf_event_ops *ops) 883 { 884 union perf_event event; 885 uint32_t size; 886 int skip = 0; 887 u64 head; 888 int err; 889 void *p; 890 891 perf_event_ops__fill_defaults(ops); 892 893 head = 0; 894 more: 895 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 896 if (err <= 0) { 897 if (err == 0) 898 goto done; 899 900 pr_err("failed to read event header\n"); 901 goto out_err; 902 } 903 904 if (self->header.needs_swap) 905 perf_event_header__bswap(&event.header); 906 907 size = event.header.size; 908 if (size == 0) 909 size = 8; 910 911 p = &event; 912 p += sizeof(struct perf_event_header); 913 914 if (size - sizeof(struct perf_event_header)) { 915 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 916 if (err <= 0) { 917 if (err == 0) { 918 pr_err("unexpected end of event stream\n"); 919 goto done; 920 } 921 922 pr_err("failed to read event data\n"); 923 goto out_err; 924 } 925 } 926 927 if (size == 0 || 928 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 929 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 930 head, event.header.size, event.header.type); 931 /* 932 * assume we lost track of the stream, check alignment, and 933 * increment a single u64 in the hope to catch on again 'soon'. 934 */ 935 if (unlikely(head & 7)) 936 head &= ~7ULL; 937 938 size = 8; 939 } 940 941 head += size; 942 943 if (skip > 0) 944 head += skip; 945 946 if (!session_done()) 947 goto more; 948 done: 949 err = 0; 950 out_err: 951 perf_session__warn_about_errors(self, ops); 952 perf_session_free_sample_buffers(self); 953 return err; 954 } 955 956 int __perf_session__process_events(struct perf_session *session, 957 u64 data_offset, u64 data_size, 958 u64 file_size, struct perf_event_ops *ops) 959 { 960 u64 head, page_offset, file_offset, file_pos, progress_next; 961 int err, mmap_prot, mmap_flags, map_idx = 0; 962 struct ui_progress *progress; 963 size_t page_size, mmap_size; 964 char *buf, *mmaps[8]; 965 union perf_event *event; 966 uint32_t size; 967 968 perf_event_ops__fill_defaults(ops); 969 970 page_size = sysconf(_SC_PAGESIZE); 971 972 page_offset = page_size * (data_offset / page_size); 973 file_offset = page_offset; 974 head = data_offset - page_offset; 975 976 if (data_offset + data_size < file_size) 977 file_size = data_offset + data_size; 978 979 progress_next = file_size / 16; 980 progress = ui_progress__new("Processing events...", file_size); 981 if (progress == NULL) 982 return -1; 983 984 mmap_size = session->mmap_window; 985 if (mmap_size > file_size) 986 mmap_size = file_size; 987 988 memset(mmaps, 0, sizeof(mmaps)); 989 990 mmap_prot = PROT_READ; 991 mmap_flags = MAP_SHARED; 992 993 if (session->header.needs_swap) { 994 mmap_prot |= PROT_WRITE; 995 mmap_flags = MAP_PRIVATE; 996 } 997 remap: 998 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 999 file_offset); 1000 if (buf == MAP_FAILED) { 1001 pr_err("failed to mmap file\n"); 1002 err = -errno; 1003 goto out_err; 1004 } 1005 mmaps[map_idx] = buf; 1006 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1007 file_pos = file_offset + head; 1008 1009 more: 1010 event = (union perf_event *)(buf + head); 1011 1012 if (session->header.needs_swap) 1013 perf_event_header__bswap(&event->header); 1014 size = event->header.size; 1015 if (size == 0) 1016 size = 8; 1017 1018 if (head + event->header.size > mmap_size) { 1019 if (mmaps[map_idx]) { 1020 munmap(mmaps[map_idx], mmap_size); 1021 mmaps[map_idx] = NULL; 1022 } 1023 1024 page_offset = page_size * (head / page_size); 1025 file_offset += page_offset; 1026 head -= page_offset; 1027 goto remap; 1028 } 1029 1030 size = event->header.size; 1031 1032 if (size == 0 || 1033 perf_session__process_event(session, event, ops, file_pos) < 0) { 1034 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1035 file_offset + head, event->header.size, 1036 event->header.type); 1037 /* 1038 * assume we lost track of the stream, check alignment, and 1039 * increment a single u64 in the hope to catch on again 'soon'. 1040 */ 1041 if (unlikely(head & 7)) 1042 head &= ~7ULL; 1043 1044 size = 8; 1045 } 1046 1047 head += size; 1048 file_pos += size; 1049 1050 if (file_pos >= progress_next) { 1051 progress_next += file_size / 16; 1052 ui_progress__update(progress, file_pos); 1053 } 1054 1055 if (file_pos < file_size) 1056 goto more; 1057 1058 err = 0; 1059 /* do the final flush for ordered samples */ 1060 session->ordered_samples.next_flush = ULLONG_MAX; 1061 flush_sample_queue(session, ops); 1062 out_err: 1063 ui_progress__delete(progress); 1064 perf_session__warn_about_errors(session, ops); 1065 perf_session_free_sample_buffers(session); 1066 return err; 1067 } 1068 1069 int perf_session__process_events(struct perf_session *self, 1070 struct perf_event_ops *ops) 1071 { 1072 int err; 1073 1074 if (perf_session__register_idle_thread(self) == NULL) 1075 return -ENOMEM; 1076 1077 if (!self->fd_pipe) 1078 err = __perf_session__process_events(self, 1079 self->header.data_offset, 1080 self->header.data_size, 1081 self->size, ops); 1082 else 1083 err = __perf_session__process_pipe_events(self, ops); 1084 1085 return err; 1086 } 1087 1088 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1089 { 1090 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1091 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1092 return false; 1093 } 1094 1095 return true; 1096 } 1097 1098 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1099 const char *symbol_name, 1100 u64 addr) 1101 { 1102 char *bracket; 1103 enum map_type i; 1104 struct ref_reloc_sym *ref; 1105 1106 ref = zalloc(sizeof(struct ref_reloc_sym)); 1107 if (ref == NULL) 1108 return -ENOMEM; 1109 1110 ref->name = strdup(symbol_name); 1111 if (ref->name == NULL) { 1112 free(ref); 1113 return -ENOMEM; 1114 } 1115 1116 bracket = strchr(ref->name, ']'); 1117 if (bracket) 1118 *bracket = '\0'; 1119 1120 ref->addr = addr; 1121 1122 for (i = 0; i < MAP__NR_TYPES; ++i) { 1123 struct kmap *kmap = map__kmap(maps[i]); 1124 kmap->ref_reloc_sym = ref; 1125 } 1126 1127 return 0; 1128 } 1129 1130 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1131 { 1132 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1133 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1134 machines__fprintf_dsos(&self->machines, fp); 1135 } 1136 1137 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1138 bool with_hits) 1139 { 1140 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1141 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1142 } 1143 1144 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1145 { 1146 struct perf_evsel *pos; 1147 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1148 1149 ret += hists__fprintf_nr_events(&session->hists, fp); 1150 1151 list_for_each_entry(pos, &session->evlist->entries, node) { 1152 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1153 ret += hists__fprintf_nr_events(&pos->hists, fp); 1154 } 1155 1156 return ret; 1157 } 1158 1159 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1160 unsigned int type) 1161 { 1162 struct perf_evsel *pos; 1163 1164 list_for_each_entry(pos, &session->evlist->entries, node) { 1165 if (pos->attr.type == type) 1166 return pos; 1167 } 1168 return NULL; 1169 } 1170 1171 void perf_session__print_symbols(union perf_event *event, 1172 struct perf_sample *sample, 1173 struct perf_session *session) 1174 { 1175 struct addr_location al; 1176 const char *symname, *dsoname; 1177 struct callchain_cursor *cursor = &session->callchain_cursor; 1178 struct callchain_cursor_node *node; 1179 1180 if (perf_event__preprocess_sample(event, session, &al, sample, 1181 NULL) < 0) { 1182 error("problem processing %d event, skipping it.\n", 1183 event->header.type); 1184 return; 1185 } 1186 1187 if (symbol_conf.use_callchain && sample->callchain) { 1188 1189 if (perf_session__resolve_callchain(session, al.thread, 1190 sample->callchain, NULL) != 0) { 1191 if (verbose) 1192 error("Failed to resolve callchain. Skipping\n"); 1193 return; 1194 } 1195 callchain_cursor_commit(cursor); 1196 1197 while (1) { 1198 node = callchain_cursor_current(cursor); 1199 if (!node) 1200 break; 1201 1202 if (node->sym && node->sym->name) 1203 symname = node->sym->name; 1204 else 1205 symname = ""; 1206 1207 if (node->map && node->map->dso && node->map->dso->name) 1208 dsoname = node->map->dso->name; 1209 else 1210 dsoname = ""; 1211 1212 printf("\t%16" PRIx64 " %s (%s)\n", node->ip, symname, dsoname); 1213 1214 callchain_cursor_advance(cursor); 1215 } 1216 1217 } else { 1218 if (al.sym && al.sym->name) 1219 symname = al.sym->name; 1220 else 1221 symname = ""; 1222 1223 if (al.map && al.map->dso && al.map->dso->name) 1224 dsoname = al.map->dso->name; 1225 else 1226 dsoname = ""; 1227 1228 printf("%16" PRIx64 " %s (%s)", al.addr, symname, dsoname); 1229 } 1230 } 1231