1 #include <linux/kernel.h> 2 3 #include <byteswap.h> 4 #include <unistd.h> 5 #include <sys/types.h> 6 #include <sys/mman.h> 7 8 #include "evlist.h" 9 #include "evsel.h" 10 #include "session.h" 11 #include "tool.h" 12 #include "sort.h" 13 #include "util.h" 14 #include "cpumap.h" 15 #include "event-parse.h" 16 #include "perf_regs.h" 17 #include "vdso.h" 18 19 static int perf_session__open(struct perf_session *self, bool force) 20 { 21 struct stat input_stat; 22 23 if (!strcmp(self->filename, "-")) { 24 self->fd_pipe = true; 25 self->fd = STDIN_FILENO; 26 27 if (perf_session__read_header(self, self->fd) < 0) 28 pr_err("incompatible file format (rerun with -v to learn more)"); 29 30 return 0; 31 } 32 33 self->fd = open(self->filename, O_RDONLY); 34 if (self->fd < 0) { 35 int err = errno; 36 37 pr_err("failed to open %s: %s", self->filename, strerror(err)); 38 if (err == ENOENT && !strcmp(self->filename, "perf.data")) 39 pr_err(" (try 'perf record' first)"); 40 pr_err("\n"); 41 return -errno; 42 } 43 44 if (fstat(self->fd, &input_stat) < 0) 45 goto out_close; 46 47 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 48 pr_err("file %s not owned by current user or root\n", 49 self->filename); 50 goto out_close; 51 } 52 53 if (!input_stat.st_size) { 54 pr_info("zero-sized file (%s), nothing to do!\n", 55 self->filename); 56 goto out_close; 57 } 58 59 if (perf_session__read_header(self, self->fd) < 0) { 60 pr_err("incompatible file format (rerun with -v to learn more)"); 61 goto out_close; 62 } 63 64 if (!perf_evlist__valid_sample_type(self->evlist)) { 65 pr_err("non matching sample_type"); 66 goto out_close; 67 } 68 69 if (!perf_evlist__valid_sample_id_all(self->evlist)) { 70 pr_err("non matching sample_id_all"); 71 goto out_close; 72 } 73 74 self->size = input_stat.st_size; 75 return 0; 76 77 out_close: 78 close(self->fd); 79 self->fd = -1; 80 return -1; 81 } 82 83 void perf_session__set_id_hdr_size(struct perf_session *session) 84 { 85 u16 id_hdr_size = perf_evlist__id_hdr_size(session->evlist); 86 87 machines__set_id_hdr_size(&session->machines, id_hdr_size); 88 } 89 90 int perf_session__create_kernel_maps(struct perf_session *self) 91 { 92 int ret = machine__create_kernel_maps(&self->machines.host); 93 94 if (ret >= 0) 95 ret = machines__create_guest_kernel_maps(&self->machines); 96 return ret; 97 } 98 99 static void perf_session__destroy_kernel_maps(struct perf_session *self) 100 { 101 machines__destroy_kernel_maps(&self->machines); 102 } 103 104 struct perf_session *perf_session__new(const char *filename, int mode, 105 bool force, bool repipe, 106 struct perf_tool *tool) 107 { 108 struct perf_session *self; 109 struct stat st; 110 size_t len; 111 112 if (!filename || !strlen(filename)) { 113 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode)) 114 filename = "-"; 115 else 116 filename = "perf.data"; 117 } 118 119 len = strlen(filename); 120 self = zalloc(sizeof(*self) + len); 121 122 if (self == NULL) 123 goto out; 124 125 memcpy(self->filename, filename, len); 126 self->repipe = repipe; 127 INIT_LIST_HEAD(&self->ordered_samples.samples); 128 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 129 INIT_LIST_HEAD(&self->ordered_samples.to_free); 130 machines__init(&self->machines); 131 132 if (mode == O_RDONLY) { 133 if (perf_session__open(self, force) < 0) 134 goto out_delete; 135 perf_session__set_id_hdr_size(self); 136 } else if (mode == O_WRONLY) { 137 /* 138 * In O_RDONLY mode this will be performed when reading the 139 * kernel MMAP event, in perf_event__process_mmap(). 140 */ 141 if (perf_session__create_kernel_maps(self) < 0) 142 goto out_delete; 143 } 144 145 if (tool && tool->ordering_requires_timestamps && 146 tool->ordered_samples && !perf_evlist__sample_id_all(self->evlist)) { 147 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 148 tool->ordered_samples = false; 149 } 150 151 out: 152 return self; 153 out_delete: 154 perf_session__delete(self); 155 return NULL; 156 } 157 158 static void perf_session__delete_dead_threads(struct perf_session *session) 159 { 160 machine__delete_dead_threads(&session->machines.host); 161 } 162 163 static void perf_session__delete_threads(struct perf_session *session) 164 { 165 machine__delete_threads(&session->machines.host); 166 } 167 168 static void perf_session_env__delete(struct perf_session_env *env) 169 { 170 free(env->hostname); 171 free(env->os_release); 172 free(env->version); 173 free(env->arch); 174 free(env->cpu_desc); 175 free(env->cpuid); 176 177 free(env->cmdline); 178 free(env->sibling_cores); 179 free(env->sibling_threads); 180 free(env->numa_nodes); 181 free(env->pmu_mappings); 182 } 183 184 void perf_session__delete(struct perf_session *self) 185 { 186 perf_session__destroy_kernel_maps(self); 187 perf_session__delete_dead_threads(self); 188 perf_session__delete_threads(self); 189 perf_session_env__delete(&self->header.env); 190 machines__exit(&self->machines); 191 close(self->fd); 192 free(self); 193 vdso__exit(); 194 } 195 196 static int process_event_synth_tracing_data_stub(union perf_event *event 197 __maybe_unused, 198 struct perf_session *session 199 __maybe_unused) 200 { 201 dump_printf(": unhandled!\n"); 202 return 0; 203 } 204 205 static int process_event_synth_attr_stub(union perf_event *event __maybe_unused, 206 struct perf_evlist **pevlist 207 __maybe_unused) 208 { 209 dump_printf(": unhandled!\n"); 210 return 0; 211 } 212 213 static int process_event_sample_stub(struct perf_tool *tool __maybe_unused, 214 union perf_event *event __maybe_unused, 215 struct perf_sample *sample __maybe_unused, 216 struct perf_evsel *evsel __maybe_unused, 217 struct machine *machine __maybe_unused) 218 { 219 dump_printf(": unhandled!\n"); 220 return 0; 221 } 222 223 static int process_event_stub(struct perf_tool *tool __maybe_unused, 224 union perf_event *event __maybe_unused, 225 struct perf_sample *sample __maybe_unused, 226 struct machine *machine __maybe_unused) 227 { 228 dump_printf(": unhandled!\n"); 229 return 0; 230 } 231 232 static int process_finished_round_stub(struct perf_tool *tool __maybe_unused, 233 union perf_event *event __maybe_unused, 234 struct perf_session *perf_session 235 __maybe_unused) 236 { 237 dump_printf(": unhandled!\n"); 238 return 0; 239 } 240 241 static int process_event_type_stub(struct perf_tool *tool __maybe_unused, 242 union perf_event *event __maybe_unused) 243 { 244 dump_printf(": unhandled!\n"); 245 return 0; 246 } 247 248 static int process_finished_round(struct perf_tool *tool, 249 union perf_event *event, 250 struct perf_session *session); 251 252 static void perf_tool__fill_defaults(struct perf_tool *tool) 253 { 254 if (tool->sample == NULL) 255 tool->sample = process_event_sample_stub; 256 if (tool->mmap == NULL) 257 tool->mmap = process_event_stub; 258 if (tool->comm == NULL) 259 tool->comm = process_event_stub; 260 if (tool->fork == NULL) 261 tool->fork = process_event_stub; 262 if (tool->exit == NULL) 263 tool->exit = process_event_stub; 264 if (tool->lost == NULL) 265 tool->lost = perf_event__process_lost; 266 if (tool->read == NULL) 267 tool->read = process_event_sample_stub; 268 if (tool->throttle == NULL) 269 tool->throttle = process_event_stub; 270 if (tool->unthrottle == NULL) 271 tool->unthrottle = process_event_stub; 272 if (tool->attr == NULL) 273 tool->attr = process_event_synth_attr_stub; 274 if (tool->event_type == NULL) 275 tool->event_type = process_event_type_stub; 276 if (tool->tracing_data == NULL) 277 tool->tracing_data = process_event_synth_tracing_data_stub; 278 if (tool->build_id == NULL) 279 tool->build_id = process_finished_round_stub; 280 if (tool->finished_round == NULL) { 281 if (tool->ordered_samples) 282 tool->finished_round = process_finished_round; 283 else 284 tool->finished_round = process_finished_round_stub; 285 } 286 } 287 288 void mem_bswap_32(void *src, int byte_size) 289 { 290 u32 *m = src; 291 while (byte_size > 0) { 292 *m = bswap_32(*m); 293 byte_size -= sizeof(u32); 294 ++m; 295 } 296 } 297 298 void mem_bswap_64(void *src, int byte_size) 299 { 300 u64 *m = src; 301 302 while (byte_size > 0) { 303 *m = bswap_64(*m); 304 byte_size -= sizeof(u64); 305 ++m; 306 } 307 } 308 309 static void swap_sample_id_all(union perf_event *event, void *data) 310 { 311 void *end = (void *) event + event->header.size; 312 int size = end - data; 313 314 BUG_ON(size % sizeof(u64)); 315 mem_bswap_64(data, size); 316 } 317 318 static void perf_event__all64_swap(union perf_event *event, 319 bool sample_id_all __maybe_unused) 320 { 321 struct perf_event_header *hdr = &event->header; 322 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 323 } 324 325 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all) 326 { 327 event->comm.pid = bswap_32(event->comm.pid); 328 event->comm.tid = bswap_32(event->comm.tid); 329 330 if (sample_id_all) { 331 void *data = &event->comm.comm; 332 333 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64)); 334 swap_sample_id_all(event, data); 335 } 336 } 337 338 static void perf_event__mmap_swap(union perf_event *event, 339 bool sample_id_all) 340 { 341 event->mmap.pid = bswap_32(event->mmap.pid); 342 event->mmap.tid = bswap_32(event->mmap.tid); 343 event->mmap.start = bswap_64(event->mmap.start); 344 event->mmap.len = bswap_64(event->mmap.len); 345 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 346 347 if (sample_id_all) { 348 void *data = &event->mmap.filename; 349 350 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64)); 351 swap_sample_id_all(event, data); 352 } 353 } 354 355 static void perf_event__task_swap(union perf_event *event, bool sample_id_all) 356 { 357 event->fork.pid = bswap_32(event->fork.pid); 358 event->fork.tid = bswap_32(event->fork.tid); 359 event->fork.ppid = bswap_32(event->fork.ppid); 360 event->fork.ptid = bswap_32(event->fork.ptid); 361 event->fork.time = bswap_64(event->fork.time); 362 363 if (sample_id_all) 364 swap_sample_id_all(event, &event->fork + 1); 365 } 366 367 static void perf_event__read_swap(union perf_event *event, bool sample_id_all) 368 { 369 event->read.pid = bswap_32(event->read.pid); 370 event->read.tid = bswap_32(event->read.tid); 371 event->read.value = bswap_64(event->read.value); 372 event->read.time_enabled = bswap_64(event->read.time_enabled); 373 event->read.time_running = bswap_64(event->read.time_running); 374 event->read.id = bswap_64(event->read.id); 375 376 if (sample_id_all) 377 swap_sample_id_all(event, &event->read + 1); 378 } 379 380 static u8 revbyte(u8 b) 381 { 382 int rev = (b >> 4) | ((b & 0xf) << 4); 383 rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2); 384 rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1); 385 return (u8) rev; 386 } 387 388 /* 389 * XXX this is hack in attempt to carry flags bitfield 390 * throught endian village. ABI says: 391 * 392 * Bit-fields are allocated from right to left (least to most significant) 393 * on little-endian implementations and from left to right (most to least 394 * significant) on big-endian implementations. 395 * 396 * The above seems to be byte specific, so we need to reverse each 397 * byte of the bitfield. 'Internet' also says this might be implementation 398 * specific and we probably need proper fix and carry perf_event_attr 399 * bitfield flags in separate data file FEAT_ section. Thought this seems 400 * to work for now. 401 */ 402 static void swap_bitfield(u8 *p, unsigned len) 403 { 404 unsigned i; 405 406 for (i = 0; i < len; i++) { 407 *p = revbyte(*p); 408 p++; 409 } 410 } 411 412 /* exported for swapping attributes in file header */ 413 void perf_event__attr_swap(struct perf_event_attr *attr) 414 { 415 attr->type = bswap_32(attr->type); 416 attr->size = bswap_32(attr->size); 417 attr->config = bswap_64(attr->config); 418 attr->sample_period = bswap_64(attr->sample_period); 419 attr->sample_type = bswap_64(attr->sample_type); 420 attr->read_format = bswap_64(attr->read_format); 421 attr->wakeup_events = bswap_32(attr->wakeup_events); 422 attr->bp_type = bswap_32(attr->bp_type); 423 attr->bp_addr = bswap_64(attr->bp_addr); 424 attr->bp_len = bswap_64(attr->bp_len); 425 426 swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64)); 427 } 428 429 static void perf_event__hdr_attr_swap(union perf_event *event, 430 bool sample_id_all __maybe_unused) 431 { 432 size_t size; 433 434 perf_event__attr_swap(&event->attr.attr); 435 436 size = event->header.size; 437 size -= (void *)&event->attr.id - (void *)event; 438 mem_bswap_64(event->attr.id, size); 439 } 440 441 static void perf_event__event_type_swap(union perf_event *event, 442 bool sample_id_all __maybe_unused) 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 bool sample_id_all __maybe_unused) 450 { 451 event->tracing_data.size = bswap_32(event->tracing_data.size); 452 } 453 454 typedef void (*perf_event__swap_op)(union perf_event *event, 455 bool sample_id_all); 456 457 static perf_event__swap_op perf_event__swap_ops[] = { 458 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 459 [PERF_RECORD_COMM] = perf_event__comm_swap, 460 [PERF_RECORD_FORK] = perf_event__task_swap, 461 [PERF_RECORD_EXIT] = perf_event__task_swap, 462 [PERF_RECORD_LOST] = perf_event__all64_swap, 463 [PERF_RECORD_READ] = perf_event__read_swap, 464 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 465 [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, 466 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 467 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 468 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 469 [PERF_RECORD_HEADER_MAX] = NULL, 470 }; 471 472 struct sample_queue { 473 u64 timestamp; 474 u64 file_offset; 475 union perf_event *event; 476 struct list_head list; 477 }; 478 479 static void perf_session_free_sample_buffers(struct perf_session *session) 480 { 481 struct ordered_samples *os = &session->ordered_samples; 482 483 while (!list_empty(&os->to_free)) { 484 struct sample_queue *sq; 485 486 sq = list_entry(os->to_free.next, struct sample_queue, list); 487 list_del(&sq->list); 488 free(sq); 489 } 490 } 491 492 static int perf_session_deliver_event(struct perf_session *session, 493 union perf_event *event, 494 struct perf_sample *sample, 495 struct perf_tool *tool, 496 u64 file_offset); 497 498 static int flush_sample_queue(struct perf_session *s, 499 struct perf_tool *tool) 500 { 501 struct ordered_samples *os = &s->ordered_samples; 502 struct list_head *head = &os->samples; 503 struct sample_queue *tmp, *iter; 504 struct perf_sample sample; 505 u64 limit = os->next_flush; 506 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 507 unsigned idx = 0, progress_next = os->nr_samples / 16; 508 int ret; 509 510 if (!tool->ordered_samples || !limit) 511 return 0; 512 513 list_for_each_entry_safe(iter, tmp, head, list) { 514 if (iter->timestamp > limit) 515 break; 516 517 ret = perf_evlist__parse_sample(s->evlist, iter->event, &sample); 518 if (ret) 519 pr_err("Can't parse sample, err = %d\n", ret); 520 else { 521 ret = perf_session_deliver_event(s, iter->event, &sample, tool, 522 iter->file_offset); 523 if (ret) 524 return ret; 525 } 526 527 os->last_flush = iter->timestamp; 528 list_del(&iter->list); 529 list_add(&iter->list, &os->sample_cache); 530 if (++idx >= progress_next) { 531 progress_next += os->nr_samples / 16; 532 ui_progress__update(idx, os->nr_samples, 533 "Processing time ordered events..."); 534 } 535 } 536 537 if (list_empty(head)) { 538 os->last_sample = NULL; 539 } else if (last_ts <= limit) { 540 os->last_sample = 541 list_entry(head->prev, struct sample_queue, list); 542 } 543 544 os->nr_samples = 0; 545 546 return 0; 547 } 548 549 /* 550 * When perf record finishes a pass on every buffers, it records this pseudo 551 * event. 552 * We record the max timestamp t found in the pass n. 553 * Assuming these timestamps are monotonic across cpus, we know that if 554 * a buffer still has events with timestamps below t, they will be all 555 * available and then read in the pass n + 1. 556 * Hence when we start to read the pass n + 2, we can safely flush every 557 * events with timestamps below t. 558 * 559 * ============ PASS n ================= 560 * CPU 0 | CPU 1 561 * | 562 * cnt1 timestamps | cnt2 timestamps 563 * 1 | 2 564 * 2 | 3 565 * - | 4 <--- max recorded 566 * 567 * ============ PASS n + 1 ============== 568 * CPU 0 | CPU 1 569 * | 570 * cnt1 timestamps | cnt2 timestamps 571 * 3 | 5 572 * 4 | 6 573 * 5 | 7 <---- max recorded 574 * 575 * Flush every events below timestamp 4 576 * 577 * ============ PASS n + 2 ============== 578 * CPU 0 | CPU 1 579 * | 580 * cnt1 timestamps | cnt2 timestamps 581 * 6 | 8 582 * 7 | 9 583 * - | 10 584 * 585 * Flush every events below timestamp 7 586 * etc... 587 */ 588 static int process_finished_round(struct perf_tool *tool, 589 union perf_event *event __maybe_unused, 590 struct perf_session *session) 591 { 592 int ret = flush_sample_queue(session, tool); 593 if (!ret) 594 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 595 596 return ret; 597 } 598 599 /* The queue is ordered by time */ 600 static void __queue_event(struct sample_queue *new, struct perf_session *s) 601 { 602 struct ordered_samples *os = &s->ordered_samples; 603 struct sample_queue *sample = os->last_sample; 604 u64 timestamp = new->timestamp; 605 struct list_head *p; 606 607 ++os->nr_samples; 608 os->last_sample = new; 609 610 if (!sample) { 611 list_add(&new->list, &os->samples); 612 os->max_timestamp = timestamp; 613 return; 614 } 615 616 /* 617 * last_sample might point to some random place in the list as it's 618 * the last queued event. We expect that the new event is close to 619 * this. 620 */ 621 if (sample->timestamp <= timestamp) { 622 while (sample->timestamp <= timestamp) { 623 p = sample->list.next; 624 if (p == &os->samples) { 625 list_add_tail(&new->list, &os->samples); 626 os->max_timestamp = timestamp; 627 return; 628 } 629 sample = list_entry(p, struct sample_queue, list); 630 } 631 list_add_tail(&new->list, &sample->list); 632 } else { 633 while (sample->timestamp > timestamp) { 634 p = sample->list.prev; 635 if (p == &os->samples) { 636 list_add(&new->list, &os->samples); 637 return; 638 } 639 sample = list_entry(p, struct sample_queue, list); 640 } 641 list_add(&new->list, &sample->list); 642 } 643 } 644 645 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 646 647 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 648 struct perf_sample *sample, u64 file_offset) 649 { 650 struct ordered_samples *os = &s->ordered_samples; 651 struct list_head *sc = &os->sample_cache; 652 u64 timestamp = sample->time; 653 struct sample_queue *new; 654 655 if (!timestamp || timestamp == ~0ULL) 656 return -ETIME; 657 658 if (timestamp < s->ordered_samples.last_flush) { 659 printf("Warning: Timestamp below last timeslice flush\n"); 660 return -EINVAL; 661 } 662 663 if (!list_empty(sc)) { 664 new = list_entry(sc->next, struct sample_queue, list); 665 list_del(&new->list); 666 } else if (os->sample_buffer) { 667 new = os->sample_buffer + os->sample_buffer_idx; 668 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 669 os->sample_buffer = NULL; 670 } else { 671 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 672 if (!os->sample_buffer) 673 return -ENOMEM; 674 list_add(&os->sample_buffer->list, &os->to_free); 675 os->sample_buffer_idx = 2; 676 new = os->sample_buffer + 1; 677 } 678 679 new->timestamp = timestamp; 680 new->file_offset = file_offset; 681 new->event = event; 682 683 __queue_event(new, s); 684 685 return 0; 686 } 687 688 static void callchain__printf(struct perf_sample *sample) 689 { 690 unsigned int i; 691 692 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 693 694 for (i = 0; i < sample->callchain->nr; i++) 695 printf("..... %2d: %016" PRIx64 "\n", 696 i, sample->callchain->ips[i]); 697 } 698 699 static void branch_stack__printf(struct perf_sample *sample) 700 { 701 uint64_t i; 702 703 printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr); 704 705 for (i = 0; i < sample->branch_stack->nr; i++) 706 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n", 707 i, sample->branch_stack->entries[i].from, 708 sample->branch_stack->entries[i].to); 709 } 710 711 static void regs_dump__printf(u64 mask, u64 *regs) 712 { 713 unsigned rid, i = 0; 714 715 for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) { 716 u64 val = regs[i++]; 717 718 printf(".... %-5s 0x%" PRIx64 "\n", 719 perf_reg_name(rid), val); 720 } 721 } 722 723 static void regs_user__printf(struct perf_sample *sample, u64 mask) 724 { 725 struct regs_dump *user_regs = &sample->user_regs; 726 727 if (user_regs->regs) { 728 printf("... user regs: mask 0x%" PRIx64 "\n", mask); 729 regs_dump__printf(mask, user_regs->regs); 730 } 731 } 732 733 static void stack_user__printf(struct stack_dump *dump) 734 { 735 printf("... ustack: size %" PRIu64 ", offset 0x%x\n", 736 dump->size, dump->offset); 737 } 738 739 static void perf_session__print_tstamp(struct perf_session *session, 740 union perf_event *event, 741 struct perf_sample *sample) 742 { 743 u64 sample_type = perf_evlist__sample_type(session->evlist); 744 745 if (event->header.type != PERF_RECORD_SAMPLE && 746 !perf_evlist__sample_id_all(session->evlist)) { 747 fputs("-1 -1 ", stdout); 748 return; 749 } 750 751 if ((sample_type & PERF_SAMPLE_CPU)) 752 printf("%u ", sample->cpu); 753 754 if (sample_type & PERF_SAMPLE_TIME) 755 printf("%" PRIu64 " ", sample->time); 756 } 757 758 static void dump_event(struct perf_session *session, union perf_event *event, 759 u64 file_offset, struct perf_sample *sample) 760 { 761 if (!dump_trace) 762 return; 763 764 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 765 file_offset, event->header.size, event->header.type); 766 767 trace_event(event); 768 769 if (sample) 770 perf_session__print_tstamp(session, event, sample); 771 772 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 773 event->header.size, perf_event__name(event->header.type)); 774 } 775 776 static void dump_sample(struct perf_evsel *evsel, union perf_event *event, 777 struct perf_sample *sample) 778 { 779 u64 sample_type; 780 781 if (!dump_trace) 782 return; 783 784 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n", 785 event->header.misc, sample->pid, sample->tid, sample->ip, 786 sample->period, sample->addr); 787 788 sample_type = evsel->attr.sample_type; 789 790 if (sample_type & PERF_SAMPLE_CALLCHAIN) 791 callchain__printf(sample); 792 793 if (sample_type & PERF_SAMPLE_BRANCH_STACK) 794 branch_stack__printf(sample); 795 796 if (sample_type & PERF_SAMPLE_REGS_USER) 797 regs_user__printf(sample, evsel->attr.sample_regs_user); 798 799 if (sample_type & PERF_SAMPLE_STACK_USER) 800 stack_user__printf(&sample->user_stack); 801 } 802 803 static struct machine * 804 perf_session__find_machine_for_cpumode(struct perf_session *session, 805 union perf_event *event) 806 { 807 const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 808 809 if (perf_guest && 810 ((cpumode == PERF_RECORD_MISC_GUEST_KERNEL) || 811 (cpumode == PERF_RECORD_MISC_GUEST_USER))) { 812 u32 pid; 813 814 if (event->header.type == PERF_RECORD_MMAP) 815 pid = event->mmap.pid; 816 else 817 pid = event->ip.pid; 818 819 return perf_session__findnew_machine(session, pid); 820 } 821 822 return &session->machines.host; 823 } 824 825 static int perf_session_deliver_event(struct perf_session *session, 826 union perf_event *event, 827 struct perf_sample *sample, 828 struct perf_tool *tool, 829 u64 file_offset) 830 { 831 struct perf_evsel *evsel; 832 struct machine *machine; 833 834 dump_event(session, event, file_offset, sample); 835 836 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 837 if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) { 838 /* 839 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here 840 * because the tools right now may apply filters, discarding 841 * some of the samples. For consistency, in the future we 842 * should have something like nr_filtered_samples and remove 843 * the sample->period from total_sample_period, etc, KISS for 844 * now tho. 845 * 846 * Also testing against NULL allows us to handle files without 847 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the 848 * future probably it'll be a good idea to restrict event 849 * processing via perf_session to files with both set. 850 */ 851 hists__inc_nr_events(&evsel->hists, event->header.type); 852 } 853 854 machine = perf_session__find_machine_for_cpumode(session, event); 855 856 switch (event->header.type) { 857 case PERF_RECORD_SAMPLE: 858 dump_sample(evsel, event, sample); 859 if (evsel == NULL) { 860 ++session->stats.nr_unknown_id; 861 return 0; 862 } 863 if (machine == NULL) { 864 ++session->stats.nr_unprocessable_samples; 865 return 0; 866 } 867 return tool->sample(tool, event, sample, evsel, machine); 868 case PERF_RECORD_MMAP: 869 return tool->mmap(tool, event, sample, machine); 870 case PERF_RECORD_COMM: 871 return tool->comm(tool, event, sample, machine); 872 case PERF_RECORD_FORK: 873 return tool->fork(tool, event, sample, machine); 874 case PERF_RECORD_EXIT: 875 return tool->exit(tool, event, sample, machine); 876 case PERF_RECORD_LOST: 877 if (tool->lost == perf_event__process_lost) 878 session->stats.total_lost += event->lost.lost; 879 return tool->lost(tool, event, sample, machine); 880 case PERF_RECORD_READ: 881 return tool->read(tool, event, sample, evsel, machine); 882 case PERF_RECORD_THROTTLE: 883 return tool->throttle(tool, event, sample, machine); 884 case PERF_RECORD_UNTHROTTLE: 885 return tool->unthrottle(tool, event, sample, machine); 886 default: 887 ++session->stats.nr_unknown_events; 888 return -1; 889 } 890 } 891 892 static int perf_session__preprocess_sample(struct perf_session *session, 893 union perf_event *event, struct perf_sample *sample) 894 { 895 if (event->header.type != PERF_RECORD_SAMPLE || 896 !(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_CALLCHAIN)) 897 return 0; 898 899 if (!ip_callchain__valid(sample->callchain, event)) { 900 pr_debug("call-chain problem with event, skipping it.\n"); 901 ++session->stats.nr_invalid_chains; 902 session->stats.total_invalid_chains += sample->period; 903 return -EINVAL; 904 } 905 return 0; 906 } 907 908 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 909 struct perf_tool *tool, u64 file_offset) 910 { 911 int err; 912 913 dump_event(session, event, file_offset, NULL); 914 915 /* These events are processed right away */ 916 switch (event->header.type) { 917 case PERF_RECORD_HEADER_ATTR: 918 err = tool->attr(event, &session->evlist); 919 if (err == 0) 920 perf_session__set_id_hdr_size(session); 921 return err; 922 case PERF_RECORD_HEADER_EVENT_TYPE: 923 return tool->event_type(tool, event); 924 case PERF_RECORD_HEADER_TRACING_DATA: 925 /* setup for reading amidst mmap */ 926 lseek(session->fd, file_offset, SEEK_SET); 927 return tool->tracing_data(event, session); 928 case PERF_RECORD_HEADER_BUILD_ID: 929 return tool->build_id(tool, event, session); 930 case PERF_RECORD_FINISHED_ROUND: 931 return tool->finished_round(tool, event, session); 932 default: 933 return -EINVAL; 934 } 935 } 936 937 static void event_swap(union perf_event *event, bool sample_id_all) 938 { 939 perf_event__swap_op swap; 940 941 swap = perf_event__swap_ops[event->header.type]; 942 if (swap) 943 swap(event, sample_id_all); 944 } 945 946 static int perf_session__process_event(struct perf_session *session, 947 union perf_event *event, 948 struct perf_tool *tool, 949 u64 file_offset) 950 { 951 struct perf_sample sample; 952 int ret; 953 954 if (session->header.needs_swap) 955 event_swap(event, perf_evlist__sample_id_all(session->evlist)); 956 957 if (event->header.type >= PERF_RECORD_HEADER_MAX) 958 return -EINVAL; 959 960 events_stats__inc(&session->stats, event->header.type); 961 962 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 963 return perf_session__process_user_event(session, event, tool, file_offset); 964 965 /* 966 * For all kernel events we get the sample data 967 */ 968 ret = perf_evlist__parse_sample(session->evlist, event, &sample); 969 if (ret) 970 return ret; 971 972 /* Preprocess sample records - precheck callchains */ 973 if (perf_session__preprocess_sample(session, event, &sample)) 974 return 0; 975 976 if (tool->ordered_samples) { 977 ret = perf_session_queue_event(session, event, &sample, 978 file_offset); 979 if (ret != -ETIME) 980 return ret; 981 } 982 983 return perf_session_deliver_event(session, event, &sample, tool, 984 file_offset); 985 } 986 987 void perf_event_header__bswap(struct perf_event_header *self) 988 { 989 self->type = bswap_32(self->type); 990 self->misc = bswap_16(self->misc); 991 self->size = bswap_16(self->size); 992 } 993 994 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid) 995 { 996 return machine__findnew_thread(&session->machines.host, pid); 997 } 998 999 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 1000 { 1001 struct thread *thread = perf_session__findnew(self, 0); 1002 1003 if (thread == NULL || thread__set_comm(thread, "swapper")) { 1004 pr_err("problem inserting idle task.\n"); 1005 thread = NULL; 1006 } 1007 1008 return thread; 1009 } 1010 1011 static void perf_session__warn_about_errors(const struct perf_session *session, 1012 const struct perf_tool *tool) 1013 { 1014 if (tool->lost == perf_event__process_lost && 1015 session->stats.nr_events[PERF_RECORD_LOST] != 0) { 1016 ui__warning("Processed %d events and lost %d chunks!\n\n" 1017 "Check IO/CPU overload!\n\n", 1018 session->stats.nr_events[0], 1019 session->stats.nr_events[PERF_RECORD_LOST]); 1020 } 1021 1022 if (session->stats.nr_unknown_events != 0) { 1023 ui__warning("Found %u unknown events!\n\n" 1024 "Is this an older tool processing a perf.data " 1025 "file generated by a more recent tool?\n\n" 1026 "If that is not the case, consider " 1027 "reporting to linux-kernel@vger.kernel.org.\n\n", 1028 session->stats.nr_unknown_events); 1029 } 1030 1031 if (session->stats.nr_unknown_id != 0) { 1032 ui__warning("%u samples with id not present in the header\n", 1033 session->stats.nr_unknown_id); 1034 } 1035 1036 if (session->stats.nr_invalid_chains != 0) { 1037 ui__warning("Found invalid callchains!\n\n" 1038 "%u out of %u events were discarded for this reason.\n\n" 1039 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 1040 session->stats.nr_invalid_chains, 1041 session->stats.nr_events[PERF_RECORD_SAMPLE]); 1042 } 1043 1044 if (session->stats.nr_unprocessable_samples != 0) { 1045 ui__warning("%u unprocessable samples recorded.\n" 1046 "Do you have a KVM guest running and not using 'perf kvm'?\n", 1047 session->stats.nr_unprocessable_samples); 1048 } 1049 } 1050 1051 #define session_done() (*(volatile int *)(&session_done)) 1052 volatile int session_done; 1053 1054 static int __perf_session__process_pipe_events(struct perf_session *self, 1055 struct perf_tool *tool) 1056 { 1057 union perf_event *event; 1058 uint32_t size, cur_size = 0; 1059 void *buf = NULL; 1060 int skip = 0; 1061 u64 head; 1062 int err; 1063 void *p; 1064 1065 perf_tool__fill_defaults(tool); 1066 1067 head = 0; 1068 cur_size = sizeof(union perf_event); 1069 1070 buf = malloc(cur_size); 1071 if (!buf) 1072 return -errno; 1073 more: 1074 event = buf; 1075 err = readn(self->fd, event, sizeof(struct perf_event_header)); 1076 if (err <= 0) { 1077 if (err == 0) 1078 goto done; 1079 1080 pr_err("failed to read event header\n"); 1081 goto out_err; 1082 } 1083 1084 if (self->header.needs_swap) 1085 perf_event_header__bswap(&event->header); 1086 1087 size = event->header.size; 1088 if (size == 0) 1089 size = 8; 1090 1091 if (size > cur_size) { 1092 void *new = realloc(buf, size); 1093 if (!new) { 1094 pr_err("failed to allocate memory to read event\n"); 1095 goto out_err; 1096 } 1097 buf = new; 1098 cur_size = size; 1099 event = buf; 1100 } 1101 p = event; 1102 p += sizeof(struct perf_event_header); 1103 1104 if (size - sizeof(struct perf_event_header)) { 1105 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 1106 if (err <= 0) { 1107 if (err == 0) { 1108 pr_err("unexpected end of event stream\n"); 1109 goto done; 1110 } 1111 1112 pr_err("failed to read event data\n"); 1113 goto out_err; 1114 } 1115 } 1116 1117 if ((skip = perf_session__process_event(self, event, tool, head)) < 0) { 1118 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n", 1119 head, event->header.size, event->header.type); 1120 err = -EINVAL; 1121 goto out_err; 1122 } 1123 1124 head += size; 1125 1126 if (skip > 0) 1127 head += skip; 1128 1129 if (!session_done()) 1130 goto more; 1131 done: 1132 err = 0; 1133 out_err: 1134 free(buf); 1135 perf_session__warn_about_errors(self, tool); 1136 perf_session_free_sample_buffers(self); 1137 return err; 1138 } 1139 1140 static union perf_event * 1141 fetch_mmaped_event(struct perf_session *session, 1142 u64 head, size_t mmap_size, char *buf) 1143 { 1144 union perf_event *event; 1145 1146 /* 1147 * Ensure we have enough space remaining to read 1148 * the size of the event in the headers. 1149 */ 1150 if (head + sizeof(event->header) > mmap_size) 1151 return NULL; 1152 1153 event = (union perf_event *)(buf + head); 1154 1155 if (session->header.needs_swap) 1156 perf_event_header__bswap(&event->header); 1157 1158 if (head + event->header.size > mmap_size) 1159 return NULL; 1160 1161 return event; 1162 } 1163 1164 /* 1165 * On 64bit we can mmap the data file in one go. No need for tiny mmap 1166 * slices. On 32bit we use 32MB. 1167 */ 1168 #if BITS_PER_LONG == 64 1169 #define MMAP_SIZE ULLONG_MAX 1170 #define NUM_MMAPS 1 1171 #else 1172 #define MMAP_SIZE (32 * 1024 * 1024ULL) 1173 #define NUM_MMAPS 128 1174 #endif 1175 1176 int __perf_session__process_events(struct perf_session *session, 1177 u64 data_offset, u64 data_size, 1178 u64 file_size, struct perf_tool *tool) 1179 { 1180 u64 head, page_offset, file_offset, file_pos, progress_next; 1181 int err, mmap_prot, mmap_flags, map_idx = 0; 1182 size_t mmap_size; 1183 char *buf, *mmaps[NUM_MMAPS]; 1184 union perf_event *event; 1185 uint32_t size; 1186 1187 perf_tool__fill_defaults(tool); 1188 1189 page_offset = page_size * (data_offset / page_size); 1190 file_offset = page_offset; 1191 head = data_offset - page_offset; 1192 1193 if (data_offset + data_size < file_size) 1194 file_size = data_offset + data_size; 1195 1196 progress_next = file_size / 16; 1197 1198 mmap_size = MMAP_SIZE; 1199 if (mmap_size > file_size) 1200 mmap_size = file_size; 1201 1202 memset(mmaps, 0, sizeof(mmaps)); 1203 1204 mmap_prot = PROT_READ; 1205 mmap_flags = MAP_SHARED; 1206 1207 if (session->header.needs_swap) { 1208 mmap_prot |= PROT_WRITE; 1209 mmap_flags = MAP_PRIVATE; 1210 } 1211 remap: 1212 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1213 file_offset); 1214 if (buf == MAP_FAILED) { 1215 pr_err("failed to mmap file\n"); 1216 err = -errno; 1217 goto out_err; 1218 } 1219 mmaps[map_idx] = buf; 1220 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1221 file_pos = file_offset + head; 1222 1223 more: 1224 event = fetch_mmaped_event(session, head, mmap_size, buf); 1225 if (!event) { 1226 if (mmaps[map_idx]) { 1227 munmap(mmaps[map_idx], mmap_size); 1228 mmaps[map_idx] = NULL; 1229 } 1230 1231 page_offset = page_size * (head / page_size); 1232 file_offset += page_offset; 1233 head -= page_offset; 1234 goto remap; 1235 } 1236 1237 size = event->header.size; 1238 1239 if (size == 0 || 1240 perf_session__process_event(session, event, tool, file_pos) < 0) { 1241 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n", 1242 file_offset + head, event->header.size, 1243 event->header.type); 1244 err = -EINVAL; 1245 goto out_err; 1246 } 1247 1248 head += size; 1249 file_pos += size; 1250 1251 if (file_pos >= progress_next) { 1252 progress_next += file_size / 16; 1253 ui_progress__update(file_pos, file_size, 1254 "Processing events..."); 1255 } 1256 1257 if (file_pos < file_size) 1258 goto more; 1259 1260 err = 0; 1261 /* do the final flush for ordered samples */ 1262 session->ordered_samples.next_flush = ULLONG_MAX; 1263 err = flush_sample_queue(session, tool); 1264 out_err: 1265 ui_progress__finish(); 1266 perf_session__warn_about_errors(session, tool); 1267 perf_session_free_sample_buffers(session); 1268 return err; 1269 } 1270 1271 int perf_session__process_events(struct perf_session *self, 1272 struct perf_tool *tool) 1273 { 1274 int err; 1275 1276 if (perf_session__register_idle_thread(self) == NULL) 1277 return -ENOMEM; 1278 1279 if (!self->fd_pipe) 1280 err = __perf_session__process_events(self, 1281 self->header.data_offset, 1282 self->header.data_size, 1283 self->size, tool); 1284 else 1285 err = __perf_session__process_pipe_events(self, tool); 1286 1287 return err; 1288 } 1289 1290 bool perf_session__has_traces(struct perf_session *session, const char *msg) 1291 { 1292 if (!(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_RAW)) { 1293 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1294 return false; 1295 } 1296 1297 return true; 1298 } 1299 1300 int maps__set_kallsyms_ref_reloc_sym(struct map **maps, 1301 const char *symbol_name, u64 addr) 1302 { 1303 char *bracket; 1304 enum map_type i; 1305 struct ref_reloc_sym *ref; 1306 1307 ref = zalloc(sizeof(struct ref_reloc_sym)); 1308 if (ref == NULL) 1309 return -ENOMEM; 1310 1311 ref->name = strdup(symbol_name); 1312 if (ref->name == NULL) { 1313 free(ref); 1314 return -ENOMEM; 1315 } 1316 1317 bracket = strchr(ref->name, ']'); 1318 if (bracket) 1319 *bracket = '\0'; 1320 1321 ref->addr = addr; 1322 1323 for (i = 0; i < MAP__NR_TYPES; ++i) { 1324 struct kmap *kmap = map__kmap(maps[i]); 1325 kmap->ref_reloc_sym = ref; 1326 } 1327 1328 return 0; 1329 } 1330 1331 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1332 { 1333 return machines__fprintf_dsos(&self->machines, fp); 1334 } 1335 1336 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1337 bool (skip)(struct dso *dso, int parm), int parm) 1338 { 1339 return machines__fprintf_dsos_buildid(&self->machines, fp, skip, parm); 1340 } 1341 1342 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1343 { 1344 struct perf_evsel *pos; 1345 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1346 1347 ret += events_stats__fprintf(&session->stats, fp); 1348 1349 list_for_each_entry(pos, &session->evlist->entries, node) { 1350 ret += fprintf(fp, "%s stats:\n", perf_evsel__name(pos)); 1351 ret += events_stats__fprintf(&pos->hists.stats, fp); 1352 } 1353 1354 return ret; 1355 } 1356 1357 size_t perf_session__fprintf(struct perf_session *session, FILE *fp) 1358 { 1359 /* 1360 * FIXME: Here we have to actually print all the machines in this 1361 * session, not just the host... 1362 */ 1363 return machine__fprintf(&session->machines.host, fp); 1364 } 1365 1366 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1367 unsigned int type) 1368 { 1369 struct perf_evsel *pos; 1370 1371 list_for_each_entry(pos, &session->evlist->entries, node) { 1372 if (pos->attr.type == type) 1373 return pos; 1374 } 1375 return NULL; 1376 } 1377 1378 void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event, 1379 struct perf_sample *sample, struct machine *machine, 1380 int print_sym, int print_dso, int print_symoffset) 1381 { 1382 struct addr_location al; 1383 struct callchain_cursor_node *node; 1384 1385 if (perf_event__preprocess_sample(event, machine, &al, sample, 1386 NULL) < 0) { 1387 error("problem processing %d event, skipping it.\n", 1388 event->header.type); 1389 return; 1390 } 1391 1392 if (symbol_conf.use_callchain && sample->callchain) { 1393 1394 1395 if (machine__resolve_callchain(machine, evsel, al.thread, 1396 sample, NULL) != 0) { 1397 if (verbose) 1398 error("Failed to resolve callchain. Skipping\n"); 1399 return; 1400 } 1401 callchain_cursor_commit(&callchain_cursor); 1402 1403 while (1) { 1404 node = callchain_cursor_current(&callchain_cursor); 1405 if (!node) 1406 break; 1407 1408 printf("\t%16" PRIx64, node->ip); 1409 if (print_sym) { 1410 printf(" "); 1411 symbol__fprintf_symname(node->sym, stdout); 1412 } 1413 if (print_dso) { 1414 printf(" ("); 1415 map__fprintf_dsoname(node->map, stdout); 1416 printf(")"); 1417 } 1418 printf("\n"); 1419 1420 callchain_cursor_advance(&callchain_cursor); 1421 } 1422 1423 } else { 1424 printf("%16" PRIx64, sample->ip); 1425 if (print_sym) { 1426 printf(" "); 1427 if (print_symoffset) 1428 symbol__fprintf_symname_offs(al.sym, &al, 1429 stdout); 1430 else 1431 symbol__fprintf_symname(al.sym, stdout); 1432 } 1433 1434 if (print_dso) { 1435 printf(" ("); 1436 map__fprintf_dsoname(al.map, stdout); 1437 printf(")"); 1438 } 1439 } 1440 } 1441 1442 int perf_session__cpu_bitmap(struct perf_session *session, 1443 const char *cpu_list, unsigned long *cpu_bitmap) 1444 { 1445 int i; 1446 struct cpu_map *map; 1447 1448 for (i = 0; i < PERF_TYPE_MAX; ++i) { 1449 struct perf_evsel *evsel; 1450 1451 evsel = perf_session__find_first_evtype(session, i); 1452 if (!evsel) 1453 continue; 1454 1455 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) { 1456 pr_err("File does not contain CPU events. " 1457 "Remove -c option to proceed.\n"); 1458 return -1; 1459 } 1460 } 1461 1462 map = cpu_map__new(cpu_list); 1463 if (map == NULL) { 1464 pr_err("Invalid cpu_list\n"); 1465 return -1; 1466 } 1467 1468 for (i = 0; i < map->nr; i++) { 1469 int cpu = map->map[i]; 1470 1471 if (cpu >= MAX_NR_CPUS) { 1472 pr_err("Requested CPU %d too large. " 1473 "Consider raising MAX_NR_CPUS\n", cpu); 1474 return -1; 1475 } 1476 1477 set_bit(cpu, cpu_bitmap); 1478 } 1479 1480 return 0; 1481 } 1482 1483 void perf_session__fprintf_info(struct perf_session *session, FILE *fp, 1484 bool full) 1485 { 1486 struct stat st; 1487 int ret; 1488 1489 if (session == NULL || fp == NULL) 1490 return; 1491 1492 ret = fstat(session->fd, &st); 1493 if (ret == -1) 1494 return; 1495 1496 fprintf(fp, "# ========\n"); 1497 fprintf(fp, "# captured on: %s", ctime(&st.st_ctime)); 1498 perf_header__fprintf_info(session, fp, full); 1499 fprintf(fp, "# ========\n#\n"); 1500 } 1501 1502 1503 int __perf_session__set_tracepoints_handlers(struct perf_session *session, 1504 const struct perf_evsel_str_handler *assocs, 1505 size_t nr_assocs) 1506 { 1507 struct perf_evlist *evlist = session->evlist; 1508 struct event_format *format; 1509 struct perf_evsel *evsel; 1510 char *tracepoint, *name; 1511 size_t i; 1512 int err; 1513 1514 for (i = 0; i < nr_assocs; i++) { 1515 err = -ENOMEM; 1516 tracepoint = strdup(assocs[i].name); 1517 if (tracepoint == NULL) 1518 goto out; 1519 1520 err = -ENOENT; 1521 name = strchr(tracepoint, ':'); 1522 if (name == NULL) 1523 goto out_free; 1524 1525 *name++ = '\0'; 1526 format = pevent_find_event_by_name(session->pevent, 1527 tracepoint, name); 1528 if (format == NULL) { 1529 /* 1530 * Adding a handler for an event not in the session, 1531 * just ignore it. 1532 */ 1533 goto next; 1534 } 1535 1536 evsel = perf_evlist__find_tracepoint_by_id(evlist, format->id); 1537 if (evsel == NULL) 1538 goto next; 1539 1540 err = -EEXIST; 1541 if (evsel->handler.func != NULL) 1542 goto out_free; 1543 evsel->handler.func = assocs[i].handler; 1544 next: 1545 free(tracepoint); 1546 } 1547 1548 err = 0; 1549 out: 1550 return err; 1551 1552 out_free: 1553 free(tracepoint); 1554 goto out; 1555 } 1556