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 if (!perf_evlist__valid_sample_type(self->evlist)) { 62 pr_err("non matching sample_type"); 63 goto out_close; 64 } 65 66 if (!perf_evlist__valid_sample_id_all(self->evlist)) { 67 pr_err("non matching sample_id_all"); 68 goto out_close; 69 } 70 71 self->size = input_stat.st_size; 72 return 0; 73 74 out_close: 75 close(self->fd); 76 self->fd = -1; 77 return -1; 78 } 79 80 static void perf_session__id_header_size(struct perf_session *session) 81 { 82 struct perf_sample *data; 83 u64 sample_type = session->sample_type; 84 u16 size = 0; 85 86 if (!session->sample_id_all) 87 goto out; 88 89 if (sample_type & PERF_SAMPLE_TID) 90 size += sizeof(data->tid) * 2; 91 92 if (sample_type & PERF_SAMPLE_TIME) 93 size += sizeof(data->time); 94 95 if (sample_type & PERF_SAMPLE_ID) 96 size += sizeof(data->id); 97 98 if (sample_type & PERF_SAMPLE_STREAM_ID) 99 size += sizeof(data->stream_id); 100 101 if (sample_type & PERF_SAMPLE_CPU) 102 size += sizeof(data->cpu) * 2; 103 out: 104 session->id_hdr_size = size; 105 } 106 107 void perf_session__update_sample_type(struct perf_session *self) 108 { 109 self->sample_type = perf_evlist__sample_type(self->evlist); 110 self->sample_size = __perf_evsel__sample_size(self->sample_type); 111 self->sample_id_all = perf_evlist__sample_id_all(self->evlist); 112 perf_session__id_header_size(self); 113 } 114 115 int perf_session__create_kernel_maps(struct perf_session *self) 116 { 117 int ret = machine__create_kernel_maps(&self->host_machine); 118 119 if (ret >= 0) 120 ret = machines__create_guest_kernel_maps(&self->machines); 121 return ret; 122 } 123 124 static void perf_session__destroy_kernel_maps(struct perf_session *self) 125 { 126 machine__destroy_kernel_maps(&self->host_machine); 127 machines__destroy_guest_kernel_maps(&self->machines); 128 } 129 130 struct perf_session *perf_session__new(const char *filename, int mode, 131 bool force, bool repipe, 132 struct perf_event_ops *ops) 133 { 134 size_t len = filename ? strlen(filename) + 1 : 0; 135 struct perf_session *self = zalloc(sizeof(*self) + len); 136 137 if (self == NULL) 138 goto out; 139 140 memcpy(self->filename, filename, len); 141 self->threads = RB_ROOT; 142 INIT_LIST_HEAD(&self->dead_threads); 143 self->last_match = NULL; 144 /* 145 * On 64bit we can mmap the data file in one go. No need for tiny mmap 146 * slices. On 32bit we use 32MB. 147 */ 148 #if BITS_PER_LONG == 64 149 self->mmap_window = ULLONG_MAX; 150 #else 151 self->mmap_window = 32 * 1024 * 1024ULL; 152 #endif 153 self->machines = RB_ROOT; 154 self->repipe = repipe; 155 INIT_LIST_HEAD(&self->ordered_samples.samples); 156 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 157 INIT_LIST_HEAD(&self->ordered_samples.to_free); 158 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 159 160 if (mode == O_RDONLY) { 161 if (perf_session__open(self, force) < 0) 162 goto out_delete; 163 perf_session__update_sample_type(self); 164 } else if (mode == O_WRONLY) { 165 /* 166 * In O_RDONLY mode this will be performed when reading the 167 * kernel MMAP event, in perf_event__process_mmap(). 168 */ 169 if (perf_session__create_kernel_maps(self) < 0) 170 goto out_delete; 171 } 172 173 if (ops && ops->ordering_requires_timestamps && 174 ops->ordered_samples && !self->sample_id_all) { 175 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 176 ops->ordered_samples = false; 177 } 178 179 out: 180 return self; 181 out_delete: 182 perf_session__delete(self); 183 return NULL; 184 } 185 186 static void perf_session__delete_dead_threads(struct perf_session *self) 187 { 188 struct thread *n, *t; 189 190 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 191 list_del(&t->node); 192 thread__delete(t); 193 } 194 } 195 196 static void perf_session__delete_threads(struct perf_session *self) 197 { 198 struct rb_node *nd = rb_first(&self->threads); 199 200 while (nd) { 201 struct thread *t = rb_entry(nd, struct thread, rb_node); 202 203 rb_erase(&t->rb_node, &self->threads); 204 nd = rb_next(nd); 205 thread__delete(t); 206 } 207 } 208 209 void perf_session__delete(struct perf_session *self) 210 { 211 perf_session__destroy_kernel_maps(self); 212 perf_session__delete_dead_threads(self); 213 perf_session__delete_threads(self); 214 machine__exit(&self->host_machine); 215 close(self->fd); 216 free(self); 217 } 218 219 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 220 { 221 self->last_match = NULL; 222 rb_erase(&th->rb_node, &self->threads); 223 /* 224 * We may have references to this thread, for instance in some hist_entry 225 * instances, so just move them to a separate list. 226 */ 227 list_add_tail(&th->node, &self->dead_threads); 228 } 229 230 static bool symbol__match_parent_regex(struct symbol *sym) 231 { 232 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 233 return 1; 234 235 return 0; 236 } 237 238 int perf_session__resolve_callchain(struct perf_session *self, 239 struct thread *thread, 240 struct ip_callchain *chain, 241 struct symbol **parent) 242 { 243 u8 cpumode = PERF_RECORD_MISC_USER; 244 unsigned int i; 245 int err; 246 247 callchain_cursor_reset(&self->callchain_cursor); 248 249 for (i = 0; i < chain->nr; i++) { 250 u64 ip = chain->ips[i]; 251 struct addr_location al; 252 253 if (ip >= PERF_CONTEXT_MAX) { 254 switch (ip) { 255 case PERF_CONTEXT_HV: 256 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 257 case PERF_CONTEXT_KERNEL: 258 cpumode = PERF_RECORD_MISC_KERNEL; break; 259 case PERF_CONTEXT_USER: 260 cpumode = PERF_RECORD_MISC_USER; break; 261 default: 262 break; 263 } 264 continue; 265 } 266 267 al.filtered = false; 268 thread__find_addr_location(thread, self, cpumode, 269 MAP__FUNCTION, thread->pid, ip, &al, NULL); 270 if (al.sym != NULL) { 271 if (sort__has_parent && !*parent && 272 symbol__match_parent_regex(al.sym)) 273 *parent = al.sym; 274 if (!symbol_conf.use_callchain) 275 break; 276 } 277 278 err = callchain_cursor_append(&self->callchain_cursor, 279 ip, al.map, al.sym); 280 if (err) 281 return err; 282 } 283 284 return 0; 285 } 286 287 static int process_event_synth_stub(union perf_event *event __used, 288 struct perf_session *session __used) 289 { 290 dump_printf(": unhandled!\n"); 291 return 0; 292 } 293 294 static int process_event_sample_stub(union perf_event *event __used, 295 struct perf_sample *sample __used, 296 struct perf_evsel *evsel __used, 297 struct perf_session *session __used) 298 { 299 dump_printf(": unhandled!\n"); 300 return 0; 301 } 302 303 static int process_event_stub(union perf_event *event __used, 304 struct perf_sample *sample __used, 305 struct perf_session *session __used) 306 { 307 dump_printf(": unhandled!\n"); 308 return 0; 309 } 310 311 static int process_finished_round_stub(union perf_event *event __used, 312 struct perf_session *session __used, 313 struct perf_event_ops *ops __used) 314 { 315 dump_printf(": unhandled!\n"); 316 return 0; 317 } 318 319 static int process_finished_round(union perf_event *event, 320 struct perf_session *session, 321 struct perf_event_ops *ops); 322 323 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 324 { 325 if (handler->sample == NULL) 326 handler->sample = process_event_sample_stub; 327 if (handler->mmap == NULL) 328 handler->mmap = process_event_stub; 329 if (handler->comm == NULL) 330 handler->comm = process_event_stub; 331 if (handler->fork == NULL) 332 handler->fork = process_event_stub; 333 if (handler->exit == NULL) 334 handler->exit = process_event_stub; 335 if (handler->lost == NULL) 336 handler->lost = perf_event__process_lost; 337 if (handler->read == NULL) 338 handler->read = process_event_stub; 339 if (handler->throttle == NULL) 340 handler->throttle = process_event_stub; 341 if (handler->unthrottle == NULL) 342 handler->unthrottle = process_event_stub; 343 if (handler->attr == NULL) 344 handler->attr = process_event_synth_stub; 345 if (handler->event_type == NULL) 346 handler->event_type = process_event_synth_stub; 347 if (handler->tracing_data == NULL) 348 handler->tracing_data = process_event_synth_stub; 349 if (handler->build_id == NULL) 350 handler->build_id = process_event_synth_stub; 351 if (handler->finished_round == NULL) { 352 if (handler->ordered_samples) 353 handler->finished_round = process_finished_round; 354 else 355 handler->finished_round = process_finished_round_stub; 356 } 357 } 358 359 void mem_bswap_64(void *src, int byte_size) 360 { 361 u64 *m = src; 362 363 while (byte_size > 0) { 364 *m = bswap_64(*m); 365 byte_size -= sizeof(u64); 366 ++m; 367 } 368 } 369 370 static void perf_event__all64_swap(union perf_event *event) 371 { 372 struct perf_event_header *hdr = &event->header; 373 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 374 } 375 376 static void perf_event__comm_swap(union perf_event *event) 377 { 378 event->comm.pid = bswap_32(event->comm.pid); 379 event->comm.tid = bswap_32(event->comm.tid); 380 } 381 382 static void perf_event__mmap_swap(union perf_event *event) 383 { 384 event->mmap.pid = bswap_32(event->mmap.pid); 385 event->mmap.tid = bswap_32(event->mmap.tid); 386 event->mmap.start = bswap_64(event->mmap.start); 387 event->mmap.len = bswap_64(event->mmap.len); 388 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 389 } 390 391 static void perf_event__task_swap(union perf_event *event) 392 { 393 event->fork.pid = bswap_32(event->fork.pid); 394 event->fork.tid = bswap_32(event->fork.tid); 395 event->fork.ppid = bswap_32(event->fork.ppid); 396 event->fork.ptid = bswap_32(event->fork.ptid); 397 event->fork.time = bswap_64(event->fork.time); 398 } 399 400 static void perf_event__read_swap(union perf_event *event) 401 { 402 event->read.pid = bswap_32(event->read.pid); 403 event->read.tid = bswap_32(event->read.tid); 404 event->read.value = bswap_64(event->read.value); 405 event->read.time_enabled = bswap_64(event->read.time_enabled); 406 event->read.time_running = bswap_64(event->read.time_running); 407 event->read.id = bswap_64(event->read.id); 408 } 409 410 static void perf_event__attr_swap(union perf_event *event) 411 { 412 size_t size; 413 414 event->attr.attr.type = bswap_32(event->attr.attr.type); 415 event->attr.attr.size = bswap_32(event->attr.attr.size); 416 event->attr.attr.config = bswap_64(event->attr.attr.config); 417 event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period); 418 event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type); 419 event->attr.attr.read_format = bswap_64(event->attr.attr.read_format); 420 event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events); 421 event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type); 422 event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr); 423 event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len); 424 425 size = event->header.size; 426 size -= (void *)&event->attr.id - (void *)event; 427 mem_bswap_64(event->attr.id, size); 428 } 429 430 static void perf_event__event_type_swap(union perf_event *event) 431 { 432 event->event_type.event_type.event_id = 433 bswap_64(event->event_type.event_type.event_id); 434 } 435 436 static void perf_event__tracing_data_swap(union perf_event *event) 437 { 438 event->tracing_data.size = bswap_32(event->tracing_data.size); 439 } 440 441 typedef void (*perf_event__swap_op)(union perf_event *event); 442 443 static perf_event__swap_op perf_event__swap_ops[] = { 444 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 445 [PERF_RECORD_COMM] = perf_event__comm_swap, 446 [PERF_RECORD_FORK] = perf_event__task_swap, 447 [PERF_RECORD_EXIT] = perf_event__task_swap, 448 [PERF_RECORD_LOST] = perf_event__all64_swap, 449 [PERF_RECORD_READ] = perf_event__read_swap, 450 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 451 [PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap, 452 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 453 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 454 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 455 [PERF_RECORD_HEADER_MAX] = NULL, 456 }; 457 458 struct sample_queue { 459 u64 timestamp; 460 u64 file_offset; 461 union perf_event *event; 462 struct list_head list; 463 }; 464 465 static void perf_session_free_sample_buffers(struct perf_session *session) 466 { 467 struct ordered_samples *os = &session->ordered_samples; 468 469 while (!list_empty(&os->to_free)) { 470 struct sample_queue *sq; 471 472 sq = list_entry(os->to_free.next, struct sample_queue, list); 473 list_del(&sq->list); 474 free(sq); 475 } 476 } 477 478 static int perf_session_deliver_event(struct perf_session *session, 479 union perf_event *event, 480 struct perf_sample *sample, 481 struct perf_event_ops *ops, 482 u64 file_offset); 483 484 static void flush_sample_queue(struct perf_session *s, 485 struct perf_event_ops *ops) 486 { 487 struct ordered_samples *os = &s->ordered_samples; 488 struct list_head *head = &os->samples; 489 struct sample_queue *tmp, *iter; 490 struct perf_sample sample; 491 u64 limit = os->next_flush; 492 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 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 } 513 514 if (list_empty(head)) { 515 os->last_sample = NULL; 516 } else if (last_ts <= limit) { 517 os->last_sample = 518 list_entry(head->prev, struct sample_queue, list); 519 } 520 } 521 522 /* 523 * When perf record finishes a pass on every buffers, it records this pseudo 524 * event. 525 * We record the max timestamp t found in the pass n. 526 * Assuming these timestamps are monotonic across cpus, we know that if 527 * a buffer still has events with timestamps below t, they will be all 528 * available and then read in the pass n + 1. 529 * Hence when we start to read the pass n + 2, we can safely flush every 530 * events with timestamps below t. 531 * 532 * ============ PASS n ================= 533 * CPU 0 | CPU 1 534 * | 535 * cnt1 timestamps | cnt2 timestamps 536 * 1 | 2 537 * 2 | 3 538 * - | 4 <--- max recorded 539 * 540 * ============ PASS n + 1 ============== 541 * CPU 0 | CPU 1 542 * | 543 * cnt1 timestamps | cnt2 timestamps 544 * 3 | 5 545 * 4 | 6 546 * 5 | 7 <---- max recorded 547 * 548 * Flush every events below timestamp 4 549 * 550 * ============ PASS n + 2 ============== 551 * CPU 0 | CPU 1 552 * | 553 * cnt1 timestamps | cnt2 timestamps 554 * 6 | 8 555 * 7 | 9 556 * - | 10 557 * 558 * Flush every events below timestamp 7 559 * etc... 560 */ 561 static int process_finished_round(union perf_event *event __used, 562 struct perf_session *session, 563 struct perf_event_ops *ops) 564 { 565 flush_sample_queue(session, ops); 566 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 567 568 return 0; 569 } 570 571 /* The queue is ordered by time */ 572 static void __queue_event(struct sample_queue *new, struct perf_session *s) 573 { 574 struct ordered_samples *os = &s->ordered_samples; 575 struct sample_queue *sample = os->last_sample; 576 u64 timestamp = new->timestamp; 577 struct list_head *p; 578 579 os->last_sample = new; 580 581 if (!sample) { 582 list_add(&new->list, &os->samples); 583 os->max_timestamp = timestamp; 584 return; 585 } 586 587 /* 588 * last_sample might point to some random place in the list as it's 589 * the last queued event. We expect that the new event is close to 590 * this. 591 */ 592 if (sample->timestamp <= timestamp) { 593 while (sample->timestamp <= timestamp) { 594 p = sample->list.next; 595 if (p == &os->samples) { 596 list_add_tail(&new->list, &os->samples); 597 os->max_timestamp = timestamp; 598 return; 599 } 600 sample = list_entry(p, struct sample_queue, list); 601 } 602 list_add_tail(&new->list, &sample->list); 603 } else { 604 while (sample->timestamp > timestamp) { 605 p = sample->list.prev; 606 if (p == &os->samples) { 607 list_add(&new->list, &os->samples); 608 return; 609 } 610 sample = list_entry(p, struct sample_queue, list); 611 } 612 list_add(&new->list, &sample->list); 613 } 614 } 615 616 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 617 618 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 619 struct perf_sample *sample, u64 file_offset) 620 { 621 struct ordered_samples *os = &s->ordered_samples; 622 struct list_head *sc = &os->sample_cache; 623 u64 timestamp = sample->time; 624 struct sample_queue *new; 625 626 if (!timestamp || timestamp == ~0ULL) 627 return -ETIME; 628 629 if (timestamp < s->ordered_samples.last_flush) { 630 printf("Warning: Timestamp below last timeslice flush\n"); 631 return -EINVAL; 632 } 633 634 if (!list_empty(sc)) { 635 new = list_entry(sc->next, struct sample_queue, list); 636 list_del(&new->list); 637 } else if (os->sample_buffer) { 638 new = os->sample_buffer + os->sample_buffer_idx; 639 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 640 os->sample_buffer = NULL; 641 } else { 642 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 643 if (!os->sample_buffer) 644 return -ENOMEM; 645 list_add(&os->sample_buffer->list, &os->to_free); 646 os->sample_buffer_idx = 2; 647 new = os->sample_buffer + 1; 648 } 649 650 new->timestamp = timestamp; 651 new->file_offset = file_offset; 652 new->event = event; 653 654 __queue_event(new, s); 655 656 return 0; 657 } 658 659 static void callchain__printf(struct perf_sample *sample) 660 { 661 unsigned int i; 662 663 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 664 665 for (i = 0; i < sample->callchain->nr; i++) 666 printf("..... %2d: %016" PRIx64 "\n", 667 i, sample->callchain->ips[i]); 668 } 669 670 static void perf_session__print_tstamp(struct perf_session *session, 671 union perf_event *event, 672 struct perf_sample *sample) 673 { 674 if (event->header.type != PERF_RECORD_SAMPLE && 675 !session->sample_id_all) { 676 fputs("-1 -1 ", stdout); 677 return; 678 } 679 680 if ((session->sample_type & PERF_SAMPLE_CPU)) 681 printf("%u ", sample->cpu); 682 683 if (session->sample_type & PERF_SAMPLE_TIME) 684 printf("%" PRIu64 " ", sample->time); 685 } 686 687 static void dump_event(struct perf_session *session, union perf_event *event, 688 u64 file_offset, struct perf_sample *sample) 689 { 690 if (!dump_trace) 691 return; 692 693 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 694 file_offset, event->header.size, event->header.type); 695 696 trace_event(event); 697 698 if (sample) 699 perf_session__print_tstamp(session, event, sample); 700 701 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 702 event->header.size, perf_event__name(event->header.type)); 703 } 704 705 static void dump_sample(struct perf_session *session, union perf_event *event, 706 struct perf_sample *sample) 707 { 708 if (!dump_trace) 709 return; 710 711 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n", 712 event->header.misc, sample->pid, sample->tid, sample->ip, 713 sample->period); 714 715 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 716 callchain__printf(sample); 717 } 718 719 static int perf_session_deliver_event(struct perf_session *session, 720 union perf_event *event, 721 struct perf_sample *sample, 722 struct perf_event_ops *ops, 723 u64 file_offset) 724 { 725 struct perf_evsel *evsel; 726 727 dump_event(session, event, file_offset, sample); 728 729 switch (event->header.type) { 730 case PERF_RECORD_SAMPLE: 731 dump_sample(session, event, sample); 732 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 733 if (evsel == NULL) { 734 ++session->hists.stats.nr_unknown_id; 735 return -1; 736 } 737 return ops->sample(event, sample, evsel, session); 738 case PERF_RECORD_MMAP: 739 return ops->mmap(event, sample, session); 740 case PERF_RECORD_COMM: 741 return ops->comm(event, sample, session); 742 case PERF_RECORD_FORK: 743 return ops->fork(event, sample, session); 744 case PERF_RECORD_EXIT: 745 return ops->exit(event, sample, session); 746 case PERF_RECORD_LOST: 747 return ops->lost(event, sample, session); 748 case PERF_RECORD_READ: 749 return ops->read(event, sample, session); 750 case PERF_RECORD_THROTTLE: 751 return ops->throttle(event, sample, session); 752 case PERF_RECORD_UNTHROTTLE: 753 return ops->unthrottle(event, sample, session); 754 default: 755 ++session->hists.stats.nr_unknown_events; 756 return -1; 757 } 758 } 759 760 static int perf_session__preprocess_sample(struct perf_session *session, 761 union perf_event *event, struct perf_sample *sample) 762 { 763 if (event->header.type != PERF_RECORD_SAMPLE || 764 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 765 return 0; 766 767 if (!ip_callchain__valid(sample->callchain, event)) { 768 pr_debug("call-chain problem with event, skipping it.\n"); 769 ++session->hists.stats.nr_invalid_chains; 770 session->hists.stats.total_invalid_chains += sample->period; 771 return -EINVAL; 772 } 773 return 0; 774 } 775 776 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 777 struct perf_event_ops *ops, u64 file_offset) 778 { 779 dump_event(session, event, file_offset, NULL); 780 781 /* These events are processed right away */ 782 switch (event->header.type) { 783 case PERF_RECORD_HEADER_ATTR: 784 return ops->attr(event, session); 785 case PERF_RECORD_HEADER_EVENT_TYPE: 786 return ops->event_type(event, session); 787 case PERF_RECORD_HEADER_TRACING_DATA: 788 /* setup for reading amidst mmap */ 789 lseek(session->fd, file_offset, SEEK_SET); 790 return ops->tracing_data(event, session); 791 case PERF_RECORD_HEADER_BUILD_ID: 792 return ops->build_id(event, session); 793 case PERF_RECORD_FINISHED_ROUND: 794 return ops->finished_round(event, session, ops); 795 default: 796 return -EINVAL; 797 } 798 } 799 800 static int perf_session__process_event(struct perf_session *session, 801 union perf_event *event, 802 struct perf_event_ops *ops, 803 u64 file_offset) 804 { 805 struct perf_sample sample; 806 int ret; 807 808 if (session->header.needs_swap && 809 perf_event__swap_ops[event->header.type]) 810 perf_event__swap_ops[event->header.type](event); 811 812 if (event->header.type >= PERF_RECORD_HEADER_MAX) 813 return -EINVAL; 814 815 hists__inc_nr_events(&session->hists, event->header.type); 816 817 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 818 return perf_session__process_user_event(session, event, ops, file_offset); 819 820 /* 821 * For all kernel events we get the sample data 822 */ 823 ret = perf_session__parse_sample(session, event, &sample); 824 if (ret) 825 return ret; 826 827 /* Preprocess sample records - precheck callchains */ 828 if (perf_session__preprocess_sample(session, event, &sample)) 829 return 0; 830 831 if (ops->ordered_samples) { 832 ret = perf_session_queue_event(session, event, &sample, 833 file_offset); 834 if (ret != -ETIME) 835 return ret; 836 } 837 838 return perf_session_deliver_event(session, event, &sample, ops, 839 file_offset); 840 } 841 842 void perf_event_header__bswap(struct perf_event_header *self) 843 { 844 self->type = bswap_32(self->type); 845 self->misc = bswap_16(self->misc); 846 self->size = bswap_16(self->size); 847 } 848 849 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 850 { 851 struct thread *thread = perf_session__findnew(self, 0); 852 853 if (thread == NULL || thread__set_comm(thread, "swapper")) { 854 pr_err("problem inserting idle task.\n"); 855 thread = NULL; 856 } 857 858 return thread; 859 } 860 861 static void perf_session__warn_about_errors(const struct perf_session *session, 862 const struct perf_event_ops *ops) 863 { 864 if (ops->lost == perf_event__process_lost && 865 session->hists.stats.total_lost != 0) { 866 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64 867 "!\n\nCheck IO/CPU overload!\n\n", 868 session->hists.stats.total_period, 869 session->hists.stats.total_lost); 870 } 871 872 if (session->hists.stats.nr_unknown_events != 0) { 873 ui__warning("Found %u unknown events!\n\n" 874 "Is this an older tool processing a perf.data " 875 "file generated by a more recent tool?\n\n" 876 "If that is not the case, consider " 877 "reporting to linux-kernel@vger.kernel.org.\n\n", 878 session->hists.stats.nr_unknown_events); 879 } 880 881 if (session->hists.stats.nr_unknown_id != 0) { 882 ui__warning("%u samples with id not present in the header\n", 883 session->hists.stats.nr_unknown_id); 884 } 885 886 if (session->hists.stats.nr_invalid_chains != 0) { 887 ui__warning("Found invalid callchains!\n\n" 888 "%u out of %u events were discarded for this reason.\n\n" 889 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 890 session->hists.stats.nr_invalid_chains, 891 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 892 } 893 } 894 895 #define session_done() (*(volatile int *)(&session_done)) 896 volatile int session_done; 897 898 static int __perf_session__process_pipe_events(struct perf_session *self, 899 struct perf_event_ops *ops) 900 { 901 union perf_event event; 902 uint32_t size; 903 int skip = 0; 904 u64 head; 905 int err; 906 void *p; 907 908 perf_event_ops__fill_defaults(ops); 909 910 head = 0; 911 more: 912 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 913 if (err <= 0) { 914 if (err == 0) 915 goto done; 916 917 pr_err("failed to read event header\n"); 918 goto out_err; 919 } 920 921 if (self->header.needs_swap) 922 perf_event_header__bswap(&event.header); 923 924 size = event.header.size; 925 if (size == 0) 926 size = 8; 927 928 p = &event; 929 p += sizeof(struct perf_event_header); 930 931 if (size - sizeof(struct perf_event_header)) { 932 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 933 if (err <= 0) { 934 if (err == 0) { 935 pr_err("unexpected end of event stream\n"); 936 goto done; 937 } 938 939 pr_err("failed to read event data\n"); 940 goto out_err; 941 } 942 } 943 944 if (size == 0 || 945 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 946 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 947 head, event.header.size, event.header.type); 948 /* 949 * assume we lost track of the stream, check alignment, and 950 * increment a single u64 in the hope to catch on again 'soon'. 951 */ 952 if (unlikely(head & 7)) 953 head &= ~7ULL; 954 955 size = 8; 956 } 957 958 head += size; 959 960 if (skip > 0) 961 head += skip; 962 963 if (!session_done()) 964 goto more; 965 done: 966 err = 0; 967 out_err: 968 perf_session__warn_about_errors(self, ops); 969 perf_session_free_sample_buffers(self); 970 return err; 971 } 972 973 static union perf_event * 974 fetch_mmaped_event(struct perf_session *session, 975 u64 head, size_t mmap_size, char *buf) 976 { 977 union perf_event *event; 978 979 /* 980 * Ensure we have enough space remaining to read 981 * the size of the event in the headers. 982 */ 983 if (head + sizeof(event->header) > mmap_size) 984 return NULL; 985 986 event = (union perf_event *)(buf + head); 987 988 if (session->header.needs_swap) 989 perf_event_header__bswap(&event->header); 990 991 if (head + event->header.size > mmap_size) 992 return NULL; 993 994 return event; 995 } 996 997 int __perf_session__process_events(struct perf_session *session, 998 u64 data_offset, u64 data_size, 999 u64 file_size, struct perf_event_ops *ops) 1000 { 1001 u64 head, page_offset, file_offset, file_pos, progress_next; 1002 int err, mmap_prot, mmap_flags, map_idx = 0; 1003 struct ui_progress *progress; 1004 size_t page_size, mmap_size; 1005 char *buf, *mmaps[8]; 1006 union perf_event *event; 1007 uint32_t size; 1008 1009 perf_event_ops__fill_defaults(ops); 1010 1011 page_size = sysconf(_SC_PAGESIZE); 1012 1013 page_offset = page_size * (data_offset / page_size); 1014 file_offset = page_offset; 1015 head = data_offset - page_offset; 1016 1017 if (data_offset + data_size < file_size) 1018 file_size = data_offset + data_size; 1019 1020 progress_next = file_size / 16; 1021 progress = ui_progress__new("Processing events...", file_size); 1022 if (progress == NULL) 1023 return -1; 1024 1025 mmap_size = session->mmap_window; 1026 if (mmap_size > file_size) 1027 mmap_size = file_size; 1028 1029 memset(mmaps, 0, sizeof(mmaps)); 1030 1031 mmap_prot = PROT_READ; 1032 mmap_flags = MAP_SHARED; 1033 1034 if (session->header.needs_swap) { 1035 mmap_prot |= PROT_WRITE; 1036 mmap_flags = MAP_PRIVATE; 1037 } 1038 remap: 1039 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1040 file_offset); 1041 if (buf == MAP_FAILED) { 1042 pr_err("failed to mmap file\n"); 1043 err = -errno; 1044 goto out_err; 1045 } 1046 mmaps[map_idx] = buf; 1047 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1048 file_pos = file_offset + head; 1049 1050 more: 1051 event = fetch_mmaped_event(session, head, mmap_size, buf); 1052 if (!event) { 1053 if (mmaps[map_idx]) { 1054 munmap(mmaps[map_idx], mmap_size); 1055 mmaps[map_idx] = NULL; 1056 } 1057 1058 page_offset = page_size * (head / page_size); 1059 file_offset += page_offset; 1060 head -= page_offset; 1061 goto remap; 1062 } 1063 1064 size = event->header.size; 1065 1066 if (size == 0 || 1067 perf_session__process_event(session, event, ops, file_pos) < 0) { 1068 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1069 file_offset + head, event->header.size, 1070 event->header.type); 1071 /* 1072 * assume we lost track of the stream, check alignment, and 1073 * increment a single u64 in the hope to catch on again 'soon'. 1074 */ 1075 if (unlikely(head & 7)) 1076 head &= ~7ULL; 1077 1078 size = 8; 1079 } 1080 1081 head += size; 1082 file_pos += size; 1083 1084 if (file_pos >= progress_next) { 1085 progress_next += file_size / 16; 1086 ui_progress__update(progress, file_pos); 1087 } 1088 1089 if (file_pos < file_size) 1090 goto more; 1091 1092 err = 0; 1093 /* do the final flush for ordered samples */ 1094 session->ordered_samples.next_flush = ULLONG_MAX; 1095 flush_sample_queue(session, ops); 1096 out_err: 1097 ui_progress__delete(progress); 1098 perf_session__warn_about_errors(session, ops); 1099 perf_session_free_sample_buffers(session); 1100 return err; 1101 } 1102 1103 int perf_session__process_events(struct perf_session *self, 1104 struct perf_event_ops *ops) 1105 { 1106 int err; 1107 1108 if (perf_session__register_idle_thread(self) == NULL) 1109 return -ENOMEM; 1110 1111 if (!self->fd_pipe) 1112 err = __perf_session__process_events(self, 1113 self->header.data_offset, 1114 self->header.data_size, 1115 self->size, ops); 1116 else 1117 err = __perf_session__process_pipe_events(self, ops); 1118 1119 return err; 1120 } 1121 1122 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1123 { 1124 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1125 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1126 return false; 1127 } 1128 1129 return true; 1130 } 1131 1132 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1133 const char *symbol_name, 1134 u64 addr) 1135 { 1136 char *bracket; 1137 enum map_type i; 1138 struct ref_reloc_sym *ref; 1139 1140 ref = zalloc(sizeof(struct ref_reloc_sym)); 1141 if (ref == NULL) 1142 return -ENOMEM; 1143 1144 ref->name = strdup(symbol_name); 1145 if (ref->name == NULL) { 1146 free(ref); 1147 return -ENOMEM; 1148 } 1149 1150 bracket = strchr(ref->name, ']'); 1151 if (bracket) 1152 *bracket = '\0'; 1153 1154 ref->addr = addr; 1155 1156 for (i = 0; i < MAP__NR_TYPES; ++i) { 1157 struct kmap *kmap = map__kmap(maps[i]); 1158 kmap->ref_reloc_sym = ref; 1159 } 1160 1161 return 0; 1162 } 1163 1164 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1165 { 1166 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1167 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1168 machines__fprintf_dsos(&self->machines, fp); 1169 } 1170 1171 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1172 bool with_hits) 1173 { 1174 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1175 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1176 } 1177 1178 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1179 { 1180 struct perf_evsel *pos; 1181 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1182 1183 ret += hists__fprintf_nr_events(&session->hists, fp); 1184 1185 list_for_each_entry(pos, &session->evlist->entries, node) { 1186 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1187 ret += hists__fprintf_nr_events(&pos->hists, fp); 1188 } 1189 1190 return ret; 1191 } 1192 1193 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1194 unsigned int type) 1195 { 1196 struct perf_evsel *pos; 1197 1198 list_for_each_entry(pos, &session->evlist->entries, node) { 1199 if (pos->attr.type == type) 1200 return pos; 1201 } 1202 return NULL; 1203 } 1204 1205 void perf_session__print_ip(union perf_event *event, 1206 struct perf_sample *sample, 1207 struct perf_session *session, 1208 int print_sym, int print_dso) 1209 { 1210 struct addr_location al; 1211 const char *symname, *dsoname; 1212 struct callchain_cursor *cursor = &session->callchain_cursor; 1213 struct callchain_cursor_node *node; 1214 1215 if (perf_event__preprocess_sample(event, session, &al, sample, 1216 NULL) < 0) { 1217 error("problem processing %d event, skipping it.\n", 1218 event->header.type); 1219 return; 1220 } 1221 1222 if (symbol_conf.use_callchain && sample->callchain) { 1223 1224 if (perf_session__resolve_callchain(session, al.thread, 1225 sample->callchain, NULL) != 0) { 1226 if (verbose) 1227 error("Failed to resolve callchain. Skipping\n"); 1228 return; 1229 } 1230 callchain_cursor_commit(cursor); 1231 1232 while (1) { 1233 node = callchain_cursor_current(cursor); 1234 if (!node) 1235 break; 1236 1237 printf("\t%16" PRIx64, node->ip); 1238 if (print_sym) { 1239 if (node->sym && node->sym->name) 1240 symname = node->sym->name; 1241 else 1242 symname = ""; 1243 1244 printf(" %s", symname); 1245 } 1246 if (print_dso) { 1247 if (node->map && node->map->dso && node->map->dso->name) 1248 dsoname = node->map->dso->name; 1249 else 1250 dsoname = ""; 1251 1252 printf(" (%s)", dsoname); 1253 } 1254 printf("\n"); 1255 1256 callchain_cursor_advance(cursor); 1257 } 1258 1259 } else { 1260 printf("%16" PRIx64, al.addr); 1261 if (print_sym) { 1262 if (al.sym && al.sym->name) 1263 symname = al.sym->name; 1264 else 1265 symname = ""; 1266 1267 printf(" %s", symname); 1268 } 1269 1270 if (print_dso) { 1271 if (al.map && al.map->dso && al.map->dso->name) 1272 dsoname = al.map->dso->name; 1273 else 1274 dsoname = ""; 1275 1276 printf(" (%s)", dsoname); 1277 } 1278 } 1279 } 1280