1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 4 * 5 * Parts came from builtin-{top,stat,record}.c, see those files for further 6 * copyright notes. 7 */ 8 #include <api/fs/fs.h> 9 #include <errno.h> 10 #include <inttypes.h> 11 #include <poll.h> 12 #include "cpumap.h" 13 #include "util/mmap.h" 14 #include "thread_map.h" 15 #include "target.h" 16 #include "evlist.h" 17 #include "evsel.h" 18 #include "record.h" 19 #include "debug.h" 20 #include "units.h" 21 #include "bpf_counter.h" 22 #include <internal/lib.h> // page_size 23 #include "affinity.h" 24 #include "../perf.h" 25 #include "asm/bug.h" 26 #include "bpf-event.h" 27 #include "util/event.h" 28 #include "util/string2.h" 29 #include "util/perf_api_probe.h" 30 #include "util/evsel_fprintf.h" 31 #include "util/pmu.h" 32 #include "util/sample.h" 33 #include "util/bpf-filter.h" 34 #include "util/stat.h" 35 #include "util/util.h" 36 #include "util/env.h" 37 #include "util/intel-tpebs.h" 38 #include <signal.h> 39 #include <unistd.h> 40 #include <sched.h> 41 #include <stdlib.h> 42 43 #include "parse-events.h" 44 #include <subcmd/parse-options.h> 45 46 #include <fcntl.h> 47 #include <sys/ioctl.h> 48 #include <sys/mman.h> 49 #include <sys/prctl.h> 50 #include <sys/timerfd.h> 51 #include <sys/wait.h> 52 53 #include <linux/bitops.h> 54 #include <linux/hash.h> 55 #include <linux/log2.h> 56 #include <linux/err.h> 57 #include <linux/string.h> 58 #include <linux/time64.h> 59 #include <linux/zalloc.h> 60 #include <perf/evlist.h> 61 #include <perf/evsel.h> 62 #include <perf/cpumap.h> 63 #include <perf/mmap.h> 64 65 #include <internal/xyarray.h> 66 67 #ifdef LACKS_SIGQUEUE_PROTOTYPE 68 int sigqueue(pid_t pid, int sig, const union sigval value); 69 #endif 70 71 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 72 #define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y) 73 74 void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus, 75 struct perf_thread_map *threads) 76 { 77 perf_evlist__init(&evlist->core); 78 perf_evlist__set_maps(&evlist->core, cpus, threads); 79 evlist->workload.pid = -1; 80 evlist->bkw_mmap_state = BKW_MMAP_NOTREADY; 81 evlist->ctl_fd.fd = -1; 82 evlist->ctl_fd.ack = -1; 83 evlist->ctl_fd.pos = -1; 84 evlist->nr_br_cntr = -1; 85 } 86 87 struct evlist *evlist__new(void) 88 { 89 struct evlist *evlist = zalloc(sizeof(*evlist)); 90 91 if (evlist != NULL) 92 evlist__init(evlist, NULL, NULL); 93 94 return evlist; 95 } 96 97 struct evlist *evlist__new_default(void) 98 { 99 struct evlist *evlist = evlist__new(); 100 bool can_profile_kernel; 101 int err; 102 103 if (!evlist) 104 return NULL; 105 106 can_profile_kernel = perf_event_paranoid_check(1); 107 err = parse_event(evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu"); 108 if (err) { 109 evlist__delete(evlist); 110 return NULL; 111 } 112 113 if (evlist->core.nr_entries > 1) { 114 struct evsel *evsel; 115 116 evlist__for_each_entry(evlist, evsel) 117 evsel__set_sample_id(evsel, /*can_sample_identifier=*/false); 118 } 119 120 return evlist; 121 } 122 123 struct evlist *evlist__new_dummy(void) 124 { 125 struct evlist *evlist = evlist__new(); 126 127 if (evlist && evlist__add_dummy(evlist)) { 128 evlist__delete(evlist); 129 evlist = NULL; 130 } 131 132 return evlist; 133 } 134 135 /** 136 * evlist__set_id_pos - set the positions of event ids. 137 * @evlist: selected event list 138 * 139 * Events with compatible sample types all have the same id_pos 140 * and is_pos. For convenience, put a copy on evlist. 141 */ 142 void evlist__set_id_pos(struct evlist *evlist) 143 { 144 struct evsel *first = evlist__first(evlist); 145 146 evlist->id_pos = first->id_pos; 147 evlist->is_pos = first->is_pos; 148 } 149 150 static void evlist__update_id_pos(struct evlist *evlist) 151 { 152 struct evsel *evsel; 153 154 evlist__for_each_entry(evlist, evsel) 155 evsel__calc_id_pos(evsel); 156 157 evlist__set_id_pos(evlist); 158 } 159 160 static void evlist__purge(struct evlist *evlist) 161 { 162 struct evsel *pos, *n; 163 164 evlist__for_each_entry_safe(evlist, n, pos) { 165 list_del_init(&pos->core.node); 166 pos->evlist = NULL; 167 evsel__delete(pos); 168 } 169 170 evlist->core.nr_entries = 0; 171 } 172 173 void evlist__exit(struct evlist *evlist) 174 { 175 event_enable_timer__exit(&evlist->eet); 176 zfree(&evlist->mmap); 177 zfree(&evlist->overwrite_mmap); 178 perf_evlist__exit(&evlist->core); 179 } 180 181 void evlist__delete(struct evlist *evlist) 182 { 183 if (evlist == NULL) 184 return; 185 186 tpebs_delete(); 187 evlist__free_stats(evlist); 188 evlist__munmap(evlist); 189 evlist__close(evlist); 190 evlist__purge(evlist); 191 evlist__exit(evlist); 192 free(evlist); 193 } 194 195 void evlist__add(struct evlist *evlist, struct evsel *entry) 196 { 197 perf_evlist__add(&evlist->core, &entry->core); 198 entry->evlist = evlist; 199 entry->tracking = !entry->core.idx; 200 201 if (evlist->core.nr_entries == 1) 202 evlist__set_id_pos(evlist); 203 } 204 205 void evlist__remove(struct evlist *evlist, struct evsel *evsel) 206 { 207 evsel->evlist = NULL; 208 perf_evlist__remove(&evlist->core, &evsel->core); 209 } 210 211 void evlist__splice_list_tail(struct evlist *evlist, struct list_head *list) 212 { 213 while (!list_empty(list)) { 214 struct evsel *evsel, *temp, *leader = NULL; 215 216 __evlist__for_each_entry_safe(list, temp, evsel) { 217 list_del_init(&evsel->core.node); 218 evlist__add(evlist, evsel); 219 leader = evsel; 220 break; 221 } 222 223 __evlist__for_each_entry_safe(list, temp, evsel) { 224 if (evsel__has_leader(evsel, leader)) { 225 list_del_init(&evsel->core.node); 226 evlist__add(evlist, evsel); 227 } 228 } 229 } 230 } 231 232 int __evlist__set_tracepoints_handlers(struct evlist *evlist, 233 const struct evsel_str_handler *assocs, size_t nr_assocs) 234 { 235 size_t i; 236 int err; 237 238 for (i = 0; i < nr_assocs; i++) { 239 // Adding a handler for an event not in this evlist, just ignore it. 240 struct evsel *evsel = evlist__find_tracepoint_by_name(evlist, assocs[i].name); 241 if (evsel == NULL) 242 continue; 243 244 err = -EEXIST; 245 if (evsel->handler != NULL) 246 goto out; 247 evsel->handler = assocs[i].handler; 248 } 249 250 err = 0; 251 out: 252 return err; 253 } 254 255 static void evlist__set_leader(struct evlist *evlist) 256 { 257 perf_evlist__set_leader(&evlist->core); 258 } 259 260 static struct evsel *evlist__dummy_event(struct evlist *evlist) 261 { 262 struct perf_event_attr attr = { 263 .type = PERF_TYPE_SOFTWARE, 264 .config = PERF_COUNT_SW_DUMMY, 265 .size = sizeof(attr), /* to capture ABI version */ 266 /* Avoid frequency mode for dummy events to avoid associated timers. */ 267 .freq = 0, 268 .sample_period = 1, 269 }; 270 271 return evsel__new_idx(&attr, evlist->core.nr_entries); 272 } 273 274 int evlist__add_dummy(struct evlist *evlist) 275 { 276 struct evsel *evsel = evlist__dummy_event(evlist); 277 278 if (evsel == NULL) 279 return -ENOMEM; 280 281 evlist__add(evlist, evsel); 282 return 0; 283 } 284 285 struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide) 286 { 287 struct evsel *evsel = evlist__dummy_event(evlist); 288 289 if (!evsel) 290 return NULL; 291 292 evsel->core.attr.exclude_kernel = 1; 293 evsel->core.attr.exclude_guest = 1; 294 evsel->core.attr.exclude_hv = 1; 295 evsel->core.system_wide = system_wide; 296 evsel->no_aux_samples = true; 297 evsel->name = strdup("dummy:u"); 298 299 evlist__add(evlist, evsel); 300 return evsel; 301 } 302 303 #ifdef HAVE_LIBTRACEEVENT 304 struct evsel *evlist__add_sched_switch(struct evlist *evlist, bool system_wide) 305 { 306 struct evsel *evsel = evsel__newtp_idx("sched", "sched_switch", 0, 307 /*format=*/true); 308 309 if (IS_ERR(evsel)) 310 return evsel; 311 312 evsel__set_sample_bit(evsel, CPU); 313 evsel__set_sample_bit(evsel, TIME); 314 315 evsel->core.system_wide = system_wide; 316 evsel->no_aux_samples = true; 317 318 evlist__add(evlist, evsel); 319 return evsel; 320 } 321 #endif 322 323 struct evsel *evlist__find_tracepoint_by_name(struct evlist *evlist, const char *name) 324 { 325 struct evsel *evsel; 326 327 evlist__for_each_entry(evlist, evsel) { 328 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) && 329 (strcmp(evsel->name, name) == 0)) 330 return evsel; 331 } 332 333 return NULL; 334 } 335 336 #ifdef HAVE_LIBTRACEEVENT 337 int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler) 338 { 339 struct evsel *evsel = evsel__newtp(sys, name); 340 341 if (IS_ERR(evsel)) 342 return -1; 343 344 evsel->handler = handler; 345 evlist__add(evlist, evsel); 346 return 0; 347 } 348 #endif 349 350 struct evlist_cpu_iterator evlist__cpu_begin(struct evlist *evlist, struct affinity *affinity) 351 { 352 struct evlist_cpu_iterator itr = { 353 .container = evlist, 354 .evsel = NULL, 355 .cpu_map_idx = 0, 356 .evlist_cpu_map_idx = 0, 357 .evlist_cpu_map_nr = perf_cpu_map__nr(evlist->core.all_cpus), 358 .cpu = (struct perf_cpu){ .cpu = -1}, 359 .affinity = affinity, 360 }; 361 362 if (evlist__empty(evlist)) { 363 /* Ensure the empty list doesn't iterate. */ 364 itr.evlist_cpu_map_idx = itr.evlist_cpu_map_nr; 365 } else { 366 itr.evsel = evlist__first(evlist); 367 if (itr.affinity) { 368 itr.cpu = perf_cpu_map__cpu(evlist->core.all_cpus, 0); 369 affinity__set(itr.affinity, itr.cpu.cpu); 370 itr.cpu_map_idx = perf_cpu_map__idx(itr.evsel->core.cpus, itr.cpu); 371 /* 372 * If this CPU isn't in the evsel's cpu map then advance 373 * through the list. 374 */ 375 if (itr.cpu_map_idx == -1) 376 evlist_cpu_iterator__next(&itr); 377 } 378 } 379 return itr; 380 } 381 382 void evlist_cpu_iterator__next(struct evlist_cpu_iterator *evlist_cpu_itr) 383 { 384 while (evlist_cpu_itr->evsel != evlist__last(evlist_cpu_itr->container)) { 385 evlist_cpu_itr->evsel = evsel__next(evlist_cpu_itr->evsel); 386 evlist_cpu_itr->cpu_map_idx = 387 perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus, 388 evlist_cpu_itr->cpu); 389 if (evlist_cpu_itr->cpu_map_idx != -1) 390 return; 391 } 392 evlist_cpu_itr->evlist_cpu_map_idx++; 393 if (evlist_cpu_itr->evlist_cpu_map_idx < evlist_cpu_itr->evlist_cpu_map_nr) { 394 evlist_cpu_itr->evsel = evlist__first(evlist_cpu_itr->container); 395 evlist_cpu_itr->cpu = 396 perf_cpu_map__cpu(evlist_cpu_itr->container->core.all_cpus, 397 evlist_cpu_itr->evlist_cpu_map_idx); 398 if (evlist_cpu_itr->affinity) 399 affinity__set(evlist_cpu_itr->affinity, evlist_cpu_itr->cpu.cpu); 400 evlist_cpu_itr->cpu_map_idx = 401 perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus, 402 evlist_cpu_itr->cpu); 403 /* 404 * If this CPU isn't in the evsel's cpu map then advance through 405 * the list. 406 */ 407 if (evlist_cpu_itr->cpu_map_idx == -1) 408 evlist_cpu_iterator__next(evlist_cpu_itr); 409 } 410 } 411 412 bool evlist_cpu_iterator__end(const struct evlist_cpu_iterator *evlist_cpu_itr) 413 { 414 return evlist_cpu_itr->evlist_cpu_map_idx >= evlist_cpu_itr->evlist_cpu_map_nr; 415 } 416 417 static int evsel__strcmp(struct evsel *pos, char *evsel_name) 418 { 419 if (!evsel_name) 420 return 0; 421 if (evsel__is_dummy_event(pos)) 422 return 1; 423 return !evsel__name_is(pos, evsel_name); 424 } 425 426 static int evlist__is_enabled(struct evlist *evlist) 427 { 428 struct evsel *pos; 429 430 evlist__for_each_entry(evlist, pos) { 431 if (!evsel__is_group_leader(pos) || !pos->core.fd) 432 continue; 433 /* If at least one event is enabled, evlist is enabled. */ 434 if (!pos->disabled) 435 return true; 436 } 437 return false; 438 } 439 440 static void __evlist__disable(struct evlist *evlist, char *evsel_name, bool excl_dummy) 441 { 442 struct evsel *pos; 443 struct evlist_cpu_iterator evlist_cpu_itr; 444 struct affinity saved_affinity, *affinity = NULL; 445 bool has_imm = false; 446 447 // See explanation in evlist__close() 448 if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) { 449 if (affinity__setup(&saved_affinity) < 0) 450 return; 451 affinity = &saved_affinity; 452 } 453 454 /* Disable 'immediate' events last */ 455 for (int imm = 0; imm <= 1; imm++) { 456 evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) { 457 pos = evlist_cpu_itr.evsel; 458 if (evsel__strcmp(pos, evsel_name)) 459 continue; 460 if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd) 461 continue; 462 if (excl_dummy && evsel__is_dummy_event(pos)) 463 continue; 464 if (pos->immediate) 465 has_imm = true; 466 if (pos->immediate != imm) 467 continue; 468 evsel__disable_cpu(pos, evlist_cpu_itr.cpu_map_idx); 469 } 470 if (!has_imm) 471 break; 472 } 473 474 affinity__cleanup(affinity); 475 evlist__for_each_entry(evlist, pos) { 476 if (evsel__strcmp(pos, evsel_name)) 477 continue; 478 if (!evsel__is_group_leader(pos) || !pos->core.fd) 479 continue; 480 if (excl_dummy && evsel__is_dummy_event(pos)) 481 continue; 482 pos->disabled = true; 483 } 484 485 /* 486 * If we disabled only single event, we need to check 487 * the enabled state of the evlist manually. 488 */ 489 if (evsel_name) 490 evlist->enabled = evlist__is_enabled(evlist); 491 else 492 evlist->enabled = false; 493 } 494 495 void evlist__disable(struct evlist *evlist) 496 { 497 __evlist__disable(evlist, NULL, false); 498 } 499 500 void evlist__disable_non_dummy(struct evlist *evlist) 501 { 502 __evlist__disable(evlist, NULL, true); 503 } 504 505 void evlist__disable_evsel(struct evlist *evlist, char *evsel_name) 506 { 507 __evlist__disable(evlist, evsel_name, false); 508 } 509 510 static void __evlist__enable(struct evlist *evlist, char *evsel_name, bool excl_dummy) 511 { 512 struct evsel *pos; 513 struct evlist_cpu_iterator evlist_cpu_itr; 514 struct affinity saved_affinity, *affinity = NULL; 515 516 // See explanation in evlist__close() 517 if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) { 518 if (affinity__setup(&saved_affinity) < 0) 519 return; 520 affinity = &saved_affinity; 521 } 522 523 evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) { 524 pos = evlist_cpu_itr.evsel; 525 if (evsel__strcmp(pos, evsel_name)) 526 continue; 527 if (!evsel__is_group_leader(pos) || !pos->core.fd) 528 continue; 529 if (excl_dummy && evsel__is_dummy_event(pos)) 530 continue; 531 evsel__enable_cpu(pos, evlist_cpu_itr.cpu_map_idx); 532 } 533 affinity__cleanup(affinity); 534 evlist__for_each_entry(evlist, pos) { 535 if (evsel__strcmp(pos, evsel_name)) 536 continue; 537 if (!evsel__is_group_leader(pos) || !pos->core.fd) 538 continue; 539 if (excl_dummy && evsel__is_dummy_event(pos)) 540 continue; 541 pos->disabled = false; 542 } 543 544 /* 545 * Even single event sets the 'enabled' for evlist, 546 * so the toggle can work properly and toggle to 547 * 'disabled' state. 548 */ 549 evlist->enabled = true; 550 } 551 552 void evlist__enable(struct evlist *evlist) 553 { 554 __evlist__enable(evlist, NULL, false); 555 } 556 557 void evlist__enable_non_dummy(struct evlist *evlist) 558 { 559 __evlist__enable(evlist, NULL, true); 560 } 561 562 void evlist__enable_evsel(struct evlist *evlist, char *evsel_name) 563 { 564 __evlist__enable(evlist, evsel_name, false); 565 } 566 567 void evlist__toggle_enable(struct evlist *evlist) 568 { 569 (evlist->enabled ? evlist__disable : evlist__enable)(evlist); 570 } 571 572 int evlist__add_pollfd(struct evlist *evlist, int fd) 573 { 574 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default); 575 } 576 577 int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask) 578 { 579 return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask); 580 } 581 582 #ifdef HAVE_EVENTFD_SUPPORT 583 int evlist__add_wakeup_eventfd(struct evlist *evlist, int fd) 584 { 585 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, 586 fdarray_flag__nonfilterable | 587 fdarray_flag__non_perf_event); 588 } 589 #endif 590 591 int evlist__poll(struct evlist *evlist, int timeout) 592 { 593 return perf_evlist__poll(&evlist->core, timeout); 594 } 595 596 struct perf_sample_id *evlist__id2sid(struct evlist *evlist, u64 id) 597 { 598 struct hlist_head *head; 599 struct perf_sample_id *sid; 600 int hash; 601 602 hash = hash_64(id, PERF_EVLIST__HLIST_BITS); 603 head = &evlist->core.heads[hash]; 604 605 hlist_for_each_entry(sid, head, node) 606 if (sid->id == id) 607 return sid; 608 609 return NULL; 610 } 611 612 struct evsel *evlist__id2evsel(struct evlist *evlist, u64 id) 613 { 614 struct perf_sample_id *sid; 615 616 if (evlist->core.nr_entries == 1 || !id) 617 return evlist__first(evlist); 618 619 sid = evlist__id2sid(evlist, id); 620 if (sid) 621 return container_of(sid->evsel, struct evsel, core); 622 623 if (!evlist__sample_id_all(evlist)) 624 return evlist__first(evlist); 625 626 return NULL; 627 } 628 629 struct evsel *evlist__id2evsel_strict(struct evlist *evlist, u64 id) 630 { 631 struct perf_sample_id *sid; 632 633 if (!id) 634 return NULL; 635 636 sid = evlist__id2sid(evlist, id); 637 if (sid) 638 return container_of(sid->evsel, struct evsel, core); 639 640 return NULL; 641 } 642 643 static int evlist__event2id(struct evlist *evlist, union perf_event *event, u64 *id) 644 { 645 const __u64 *array = event->sample.array; 646 ssize_t n; 647 648 n = (event->header.size - sizeof(event->header)) >> 3; 649 650 if (event->header.type == PERF_RECORD_SAMPLE) { 651 if (evlist->id_pos >= n) 652 return -1; 653 *id = array[evlist->id_pos]; 654 } else { 655 if (evlist->is_pos > n) 656 return -1; 657 n -= evlist->is_pos; 658 *id = array[n]; 659 } 660 return 0; 661 } 662 663 struct evsel *evlist__event2evsel(struct evlist *evlist, union perf_event *event) 664 { 665 struct evsel *first = evlist__first(evlist); 666 struct hlist_head *head; 667 struct perf_sample_id *sid; 668 int hash; 669 u64 id; 670 671 if (evlist->core.nr_entries == 1) 672 return first; 673 674 if (!first->core.attr.sample_id_all && 675 event->header.type != PERF_RECORD_SAMPLE) 676 return first; 677 678 if (evlist__event2id(evlist, event, &id)) 679 return NULL; 680 681 /* Synthesized events have an id of zero */ 682 if (!id) 683 return first; 684 685 hash = hash_64(id, PERF_EVLIST__HLIST_BITS); 686 head = &evlist->core.heads[hash]; 687 688 hlist_for_each_entry(sid, head, node) { 689 if (sid->id == id) 690 return container_of(sid->evsel, struct evsel, core); 691 } 692 return NULL; 693 } 694 695 static int evlist__set_paused(struct evlist *evlist, bool value) 696 { 697 int i; 698 699 if (!evlist->overwrite_mmap) 700 return 0; 701 702 for (i = 0; i < evlist->core.nr_mmaps; i++) { 703 int fd = evlist->overwrite_mmap[i].core.fd; 704 int err; 705 706 if (fd < 0) 707 continue; 708 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0); 709 if (err) 710 return err; 711 } 712 return 0; 713 } 714 715 static int evlist__pause(struct evlist *evlist) 716 { 717 return evlist__set_paused(evlist, true); 718 } 719 720 static int evlist__resume(struct evlist *evlist) 721 { 722 return evlist__set_paused(evlist, false); 723 } 724 725 static void evlist__munmap_nofree(struct evlist *evlist) 726 { 727 int i; 728 729 if (evlist->mmap) 730 for (i = 0; i < evlist->core.nr_mmaps; i++) 731 perf_mmap__munmap(&evlist->mmap[i].core); 732 733 if (evlist->overwrite_mmap) 734 for (i = 0; i < evlist->core.nr_mmaps; i++) 735 perf_mmap__munmap(&evlist->overwrite_mmap[i].core); 736 } 737 738 void evlist__munmap(struct evlist *evlist) 739 { 740 evlist__munmap_nofree(evlist); 741 zfree(&evlist->mmap); 742 zfree(&evlist->overwrite_mmap); 743 } 744 745 static void perf_mmap__unmap_cb(struct perf_mmap *map) 746 { 747 struct mmap *m = container_of(map, struct mmap, core); 748 749 mmap__munmap(m); 750 } 751 752 static struct mmap *evlist__alloc_mmap(struct evlist *evlist, 753 bool overwrite) 754 { 755 int i; 756 struct mmap *map; 757 758 map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap)); 759 if (!map) 760 return NULL; 761 762 for (i = 0; i < evlist->core.nr_mmaps; i++) { 763 struct perf_mmap *prev = i ? &map[i - 1].core : NULL; 764 765 /* 766 * When the perf_mmap() call is made we grab one refcount, plus 767 * one extra to let perf_mmap__consume() get the last 768 * events after all real references (perf_mmap__get()) are 769 * dropped. 770 * 771 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and 772 * thus does perf_mmap__get() on it. 773 */ 774 perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb); 775 } 776 777 return map; 778 } 779 780 static void 781 perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist, 782 struct perf_evsel *_evsel, 783 struct perf_mmap_param *_mp, 784 int idx) 785 { 786 struct evlist *evlist = container_of(_evlist, struct evlist, core); 787 struct mmap_params *mp = container_of(_mp, struct mmap_params, core); 788 struct evsel *evsel = container_of(_evsel, struct evsel, core); 789 790 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, evsel, idx); 791 } 792 793 static struct perf_mmap* 794 perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx) 795 { 796 struct evlist *evlist = container_of(_evlist, struct evlist, core); 797 struct mmap *maps; 798 799 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap; 800 801 if (!maps) { 802 maps = evlist__alloc_mmap(evlist, overwrite); 803 if (!maps) 804 return NULL; 805 806 if (overwrite) { 807 evlist->overwrite_mmap = maps; 808 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY) 809 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING); 810 } else { 811 evlist->mmap = maps; 812 } 813 } 814 815 return &maps[idx].core; 816 } 817 818 static int 819 perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp, 820 int output, struct perf_cpu cpu) 821 { 822 struct mmap *map = container_of(_map, struct mmap, core); 823 struct mmap_params *mp = container_of(_mp, struct mmap_params, core); 824 825 return mmap__mmap(map, mp, output, cpu); 826 } 827 828 unsigned long perf_event_mlock_kb_in_pages(void) 829 { 830 unsigned long pages; 831 int max; 832 833 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) { 834 /* 835 * Pick a once upon a time good value, i.e. things look 836 * strange since we can't read a sysctl value, but lets not 837 * die yet... 838 */ 839 max = 512; 840 } else { 841 max -= (page_size / 1024); 842 } 843 844 pages = (max * 1024) / page_size; 845 if (!is_power_of_2(pages)) 846 pages = rounddown_pow_of_two(pages); 847 848 return pages; 849 } 850 851 size_t evlist__mmap_size(unsigned long pages) 852 { 853 if (pages == UINT_MAX) 854 pages = perf_event_mlock_kb_in_pages(); 855 else if (!is_power_of_2(pages)) 856 return 0; 857 858 return (pages + 1) * page_size; 859 } 860 861 static long parse_pages_arg(const char *str, unsigned long min, 862 unsigned long max) 863 { 864 unsigned long pages, val; 865 static struct parse_tag tags[] = { 866 { .tag = 'B', .mult = 1 }, 867 { .tag = 'K', .mult = 1 << 10 }, 868 { .tag = 'M', .mult = 1 << 20 }, 869 { .tag = 'G', .mult = 1 << 30 }, 870 { .tag = 0 }, 871 }; 872 873 if (str == NULL) 874 return -EINVAL; 875 876 val = parse_tag_value(str, tags); 877 if (val != (unsigned long) -1) { 878 /* we got file size value */ 879 pages = PERF_ALIGN(val, page_size) / page_size; 880 } else { 881 /* we got pages count value */ 882 char *eptr; 883 pages = strtoul(str, &eptr, 10); 884 if (*eptr != '\0') 885 return -EINVAL; 886 } 887 888 if (pages == 0 && min == 0) { 889 /* leave number of pages at 0 */ 890 } else if (!is_power_of_2(pages)) { 891 char buf[100]; 892 893 /* round pages up to next power of 2 */ 894 pages = roundup_pow_of_two(pages); 895 if (!pages) 896 return -EINVAL; 897 898 unit_number__scnprintf(buf, sizeof(buf), pages * page_size); 899 pr_info("rounding mmap pages size to %s (%lu pages)\n", 900 buf, pages); 901 } 902 903 if (pages > max) 904 return -EINVAL; 905 906 return pages; 907 } 908 909 int __evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str) 910 { 911 unsigned long max = UINT_MAX; 912 long pages; 913 914 if (max > SIZE_MAX / page_size) 915 max = SIZE_MAX / page_size; 916 917 pages = parse_pages_arg(str, 1, max); 918 if (pages < 0) { 919 pr_err("Invalid argument for --mmap_pages/-m\n"); 920 return -1; 921 } 922 923 *mmap_pages = pages; 924 return 0; 925 } 926 927 int evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset __maybe_unused) 928 { 929 return __evlist__parse_mmap_pages(opt->value, str); 930 } 931 932 /** 933 * evlist__mmap_ex - Create mmaps to receive events. 934 * @evlist: list of events 935 * @pages: map length in pages 936 * @overwrite: overwrite older events? 937 * @auxtrace_pages - auxtrace map length in pages 938 * @auxtrace_overwrite - overwrite older auxtrace data? 939 * 940 * If @overwrite is %false the user needs to signal event consumption using 941 * perf_mmap__write_tail(). Using evlist__mmap_read() does this 942 * automatically. 943 * 944 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data 945 * consumption using auxtrace_mmap__write_tail(). 946 * 947 * Return: %0 on success, negative error code otherwise. 948 */ 949 int evlist__mmap_ex(struct evlist *evlist, unsigned int pages, 950 unsigned int auxtrace_pages, 951 bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush, 952 int comp_level) 953 { 954 /* 955 * Delay setting mp.prot: set it before calling perf_mmap__mmap. 956 * Its value is decided by evsel's write_backward. 957 * So &mp should not be passed through const pointer. 958 */ 959 struct mmap_params mp = { 960 .nr_cblocks = nr_cblocks, 961 .affinity = affinity, 962 .flush = flush, 963 .comp_level = comp_level 964 }; 965 struct perf_evlist_mmap_ops ops = { 966 .idx = perf_evlist__mmap_cb_idx, 967 .get = perf_evlist__mmap_cb_get, 968 .mmap = perf_evlist__mmap_cb_mmap, 969 }; 970 971 evlist->core.mmap_len = evlist__mmap_size(pages); 972 pr_debug("mmap size %zuB\n", evlist->core.mmap_len); 973 974 auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len, 975 auxtrace_pages, auxtrace_overwrite); 976 977 return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core); 978 } 979 980 int evlist__mmap(struct evlist *evlist, unsigned int pages) 981 { 982 return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0); 983 } 984 985 int evlist__create_maps(struct evlist *evlist, struct target *target) 986 { 987 bool all_threads = (target->per_thread && target->system_wide); 988 struct perf_cpu_map *cpus; 989 struct perf_thread_map *threads; 990 991 /* 992 * If specify '-a' and '--per-thread' to perf record, perf record 993 * will override '--per-thread'. target->per_thread = false and 994 * target->system_wide = true. 995 * 996 * If specify '--per-thread' only to perf record, 997 * target->per_thread = true and target->system_wide = false. 998 * 999 * So target->per_thread && target->system_wide is false. 1000 * For perf record, thread_map__new_str doesn't call 1001 * thread_map__new_all_cpus. That will keep perf record's 1002 * current behavior. 1003 * 1004 * For perf stat, it allows the case that target->per_thread and 1005 * target->system_wide are all true. It means to collect system-wide 1006 * per-thread data. thread_map__new_str will call 1007 * thread_map__new_all_cpus to enumerate all threads. 1008 */ 1009 threads = thread_map__new_str(target->pid, target->tid, target->uid, 1010 all_threads); 1011 1012 if (!threads) 1013 return -1; 1014 1015 if (target__uses_dummy_map(target) && !evlist__has_bpf_output(evlist)) 1016 cpus = perf_cpu_map__new_any_cpu(); 1017 else 1018 cpus = perf_cpu_map__new(target->cpu_list); 1019 1020 if (!cpus) 1021 goto out_delete_threads; 1022 1023 evlist->core.has_user_cpus = !!target->cpu_list; 1024 1025 perf_evlist__set_maps(&evlist->core, cpus, threads); 1026 1027 /* as evlist now has references, put count here */ 1028 perf_cpu_map__put(cpus); 1029 perf_thread_map__put(threads); 1030 1031 return 0; 1032 1033 out_delete_threads: 1034 perf_thread_map__put(threads); 1035 return -1; 1036 } 1037 1038 int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel, 1039 struct target *target) 1040 { 1041 struct evsel *evsel; 1042 int err = 0; 1043 1044 evlist__for_each_entry(evlist, evsel) { 1045 /* 1046 * filters only work for tracepoint event, which doesn't have cpu limit. 1047 * So evlist and evsel should always be same. 1048 */ 1049 if (evsel->filter) { 1050 err = perf_evsel__apply_filter(&evsel->core, evsel->filter); 1051 if (err) { 1052 *err_evsel = evsel; 1053 break; 1054 } 1055 } 1056 1057 /* 1058 * non-tracepoint events can have BPF filters. 1059 */ 1060 if (!list_empty(&evsel->bpf_filters)) { 1061 err = perf_bpf_filter__prepare(evsel, target); 1062 if (err) { 1063 *err_evsel = evsel; 1064 break; 1065 } 1066 } 1067 } 1068 1069 return err; 1070 } 1071 1072 int evlist__set_tp_filter(struct evlist *evlist, const char *filter) 1073 { 1074 struct evsel *evsel; 1075 int err = 0; 1076 1077 if (filter == NULL) 1078 return -1; 1079 1080 evlist__for_each_entry(evlist, evsel) { 1081 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT) 1082 continue; 1083 1084 err = evsel__set_filter(evsel, filter); 1085 if (err) 1086 break; 1087 } 1088 1089 return err; 1090 } 1091 1092 int evlist__append_tp_filter(struct evlist *evlist, const char *filter) 1093 { 1094 struct evsel *evsel; 1095 int err = 0; 1096 1097 if (filter == NULL) 1098 return -1; 1099 1100 evlist__for_each_entry(evlist, evsel) { 1101 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT) 1102 continue; 1103 1104 err = evsel__append_tp_filter(evsel, filter); 1105 if (err) 1106 break; 1107 } 1108 1109 return err; 1110 } 1111 1112 char *asprintf__tp_filter_pids(size_t npids, pid_t *pids) 1113 { 1114 char *filter; 1115 size_t i; 1116 1117 for (i = 0; i < npids; ++i) { 1118 if (i == 0) { 1119 if (asprintf(&filter, "common_pid != %d", pids[i]) < 0) 1120 return NULL; 1121 } else { 1122 char *tmp; 1123 1124 if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0) 1125 goto out_free; 1126 1127 free(filter); 1128 filter = tmp; 1129 } 1130 } 1131 1132 return filter; 1133 out_free: 1134 free(filter); 1135 return NULL; 1136 } 1137 1138 int evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids) 1139 { 1140 char *filter = asprintf__tp_filter_pids(npids, pids); 1141 int ret = evlist__set_tp_filter(evlist, filter); 1142 1143 free(filter); 1144 return ret; 1145 } 1146 1147 int evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids) 1148 { 1149 char *filter = asprintf__tp_filter_pids(npids, pids); 1150 int ret = evlist__append_tp_filter(evlist, filter); 1151 1152 free(filter); 1153 return ret; 1154 } 1155 1156 int evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid) 1157 { 1158 return evlist__append_tp_filter_pids(evlist, 1, &pid); 1159 } 1160 1161 bool evlist__valid_sample_type(struct evlist *evlist) 1162 { 1163 struct evsel *pos; 1164 1165 if (evlist->core.nr_entries == 1) 1166 return true; 1167 1168 if (evlist->id_pos < 0 || evlist->is_pos < 0) 1169 return false; 1170 1171 evlist__for_each_entry(evlist, pos) { 1172 if (pos->id_pos != evlist->id_pos || 1173 pos->is_pos != evlist->is_pos) 1174 return false; 1175 } 1176 1177 return true; 1178 } 1179 1180 u64 __evlist__combined_sample_type(struct evlist *evlist) 1181 { 1182 struct evsel *evsel; 1183 1184 if (evlist->combined_sample_type) 1185 return evlist->combined_sample_type; 1186 1187 evlist__for_each_entry(evlist, evsel) 1188 evlist->combined_sample_type |= evsel->core.attr.sample_type; 1189 1190 return evlist->combined_sample_type; 1191 } 1192 1193 u64 evlist__combined_sample_type(struct evlist *evlist) 1194 { 1195 evlist->combined_sample_type = 0; 1196 return __evlist__combined_sample_type(evlist); 1197 } 1198 1199 u64 evlist__combined_branch_type(struct evlist *evlist) 1200 { 1201 struct evsel *evsel; 1202 u64 branch_type = 0; 1203 1204 evlist__for_each_entry(evlist, evsel) 1205 branch_type |= evsel->core.attr.branch_sample_type; 1206 return branch_type; 1207 } 1208 1209 static struct evsel * 1210 evlist__find_dup_event_from_prev(struct evlist *evlist, struct evsel *event) 1211 { 1212 struct evsel *pos; 1213 1214 evlist__for_each_entry(evlist, pos) { 1215 if (event == pos) 1216 break; 1217 if ((pos->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) && 1218 !strcmp(pos->name, event->name)) 1219 return pos; 1220 } 1221 return NULL; 1222 } 1223 1224 #define MAX_NR_ABBR_NAME (26 * 11) 1225 1226 /* 1227 * The abbr name is from A to Z9. If the number of event 1228 * which requires the branch counter > MAX_NR_ABBR_NAME, 1229 * return NA. 1230 */ 1231 static void evlist__new_abbr_name(char *name) 1232 { 1233 static int idx; 1234 int i = idx / 26; 1235 1236 if (idx >= MAX_NR_ABBR_NAME) { 1237 name[0] = 'N'; 1238 name[1] = 'A'; 1239 name[2] = '\0'; 1240 return; 1241 } 1242 1243 name[0] = 'A' + (idx % 26); 1244 1245 if (!i) 1246 name[1] = '\0'; 1247 else { 1248 name[1] = '0' + i - 1; 1249 name[2] = '\0'; 1250 } 1251 1252 idx++; 1253 } 1254 1255 void evlist__update_br_cntr(struct evlist *evlist) 1256 { 1257 struct evsel *evsel, *dup; 1258 int i = 0; 1259 1260 evlist__for_each_entry(evlist, evsel) { 1261 if (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) { 1262 evsel->br_cntr_idx = i++; 1263 evsel__leader(evsel)->br_cntr_nr++; 1264 1265 dup = evlist__find_dup_event_from_prev(evlist, evsel); 1266 if (dup) 1267 memcpy(evsel->abbr_name, dup->abbr_name, 3 * sizeof(char)); 1268 else 1269 evlist__new_abbr_name(evsel->abbr_name); 1270 } 1271 } 1272 evlist->nr_br_cntr = i; 1273 } 1274 1275 bool evlist__valid_read_format(struct evlist *evlist) 1276 { 1277 struct evsel *first = evlist__first(evlist), *pos = first; 1278 u64 read_format = first->core.attr.read_format; 1279 u64 sample_type = first->core.attr.sample_type; 1280 1281 evlist__for_each_entry(evlist, pos) { 1282 if (read_format != pos->core.attr.read_format) { 1283 pr_debug("Read format differs %#" PRIx64 " vs %#" PRIx64 "\n", 1284 read_format, (u64)pos->core.attr.read_format); 1285 } 1286 } 1287 1288 /* PERF_SAMPLE_READ implies PERF_FORMAT_ID. */ 1289 if ((sample_type & PERF_SAMPLE_READ) && 1290 !(read_format & PERF_FORMAT_ID)) { 1291 return false; 1292 } 1293 1294 return true; 1295 } 1296 1297 u16 evlist__id_hdr_size(struct evlist *evlist) 1298 { 1299 struct evsel *first = evlist__first(evlist); 1300 1301 return first->core.attr.sample_id_all ? evsel__id_hdr_size(first) : 0; 1302 } 1303 1304 bool evlist__valid_sample_id_all(struct evlist *evlist) 1305 { 1306 struct evsel *first = evlist__first(evlist), *pos = first; 1307 1308 evlist__for_each_entry_continue(evlist, pos) { 1309 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all) 1310 return false; 1311 } 1312 1313 return true; 1314 } 1315 1316 bool evlist__sample_id_all(struct evlist *evlist) 1317 { 1318 struct evsel *first = evlist__first(evlist); 1319 return first->core.attr.sample_id_all; 1320 } 1321 1322 void evlist__set_selected(struct evlist *evlist, struct evsel *evsel) 1323 { 1324 evlist->selected = evsel; 1325 } 1326 1327 void evlist__close(struct evlist *evlist) 1328 { 1329 struct evsel *evsel; 1330 struct evlist_cpu_iterator evlist_cpu_itr; 1331 struct affinity affinity; 1332 1333 /* 1334 * With perf record core.user_requested_cpus is usually NULL. 1335 * Use the old method to handle this for now. 1336 */ 1337 if (!evlist->core.user_requested_cpus || 1338 cpu_map__is_dummy(evlist->core.user_requested_cpus)) { 1339 evlist__for_each_entry_reverse(evlist, evsel) 1340 evsel__close(evsel); 1341 return; 1342 } 1343 1344 if (affinity__setup(&affinity) < 0) 1345 return; 1346 1347 evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) { 1348 perf_evsel__close_cpu(&evlist_cpu_itr.evsel->core, 1349 evlist_cpu_itr.cpu_map_idx); 1350 } 1351 1352 affinity__cleanup(&affinity); 1353 evlist__for_each_entry_reverse(evlist, evsel) { 1354 perf_evsel__free_fd(&evsel->core); 1355 perf_evsel__free_id(&evsel->core); 1356 } 1357 perf_evlist__reset_id_hash(&evlist->core); 1358 } 1359 1360 static int evlist__create_syswide_maps(struct evlist *evlist) 1361 { 1362 struct perf_cpu_map *cpus; 1363 struct perf_thread_map *threads; 1364 1365 /* 1366 * Try reading /sys/devices/system/cpu/online to get 1367 * an all cpus map. 1368 * 1369 * FIXME: -ENOMEM is the best we can do here, the cpu_map 1370 * code needs an overhaul to properly forward the 1371 * error, and we may not want to do that fallback to a 1372 * default cpu identity map :-\ 1373 */ 1374 cpus = perf_cpu_map__new_online_cpus(); 1375 if (!cpus) 1376 goto out; 1377 1378 threads = perf_thread_map__new_dummy(); 1379 if (!threads) 1380 goto out_put; 1381 1382 perf_evlist__set_maps(&evlist->core, cpus, threads); 1383 1384 perf_thread_map__put(threads); 1385 out_put: 1386 perf_cpu_map__put(cpus); 1387 out: 1388 return -ENOMEM; 1389 } 1390 1391 int evlist__open(struct evlist *evlist) 1392 { 1393 struct evsel *evsel; 1394 int err; 1395 1396 /* 1397 * Default: one fd per CPU, all threads, aka systemwide 1398 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL 1399 */ 1400 if (evlist->core.threads == NULL && evlist->core.user_requested_cpus == NULL) { 1401 err = evlist__create_syswide_maps(evlist); 1402 if (err < 0) 1403 goto out_err; 1404 } 1405 1406 evlist__update_id_pos(evlist); 1407 1408 evlist__for_each_entry(evlist, evsel) { 1409 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads); 1410 if (err < 0) 1411 goto out_err; 1412 } 1413 1414 return 0; 1415 out_err: 1416 evlist__close(evlist); 1417 errno = -err; 1418 return err; 1419 } 1420 1421 int evlist__prepare_workload(struct evlist *evlist, struct target *target, const char *argv[], 1422 bool pipe_output, void (*exec_error)(int signo, siginfo_t *info, void *ucontext)) 1423 { 1424 int child_ready_pipe[2], go_pipe[2]; 1425 char bf; 1426 1427 evlist->workload.cork_fd = -1; 1428 1429 if (pipe(child_ready_pipe) < 0) { 1430 perror("failed to create 'ready' pipe"); 1431 return -1; 1432 } 1433 1434 if (pipe(go_pipe) < 0) { 1435 perror("failed to create 'go' pipe"); 1436 goto out_close_ready_pipe; 1437 } 1438 1439 evlist->workload.pid = fork(); 1440 if (evlist->workload.pid < 0) { 1441 perror("failed to fork"); 1442 goto out_close_pipes; 1443 } 1444 1445 if (!evlist->workload.pid) { 1446 int ret; 1447 1448 if (pipe_output) 1449 dup2(2, 1); 1450 1451 signal(SIGTERM, SIG_DFL); 1452 1453 close(child_ready_pipe[0]); 1454 close(go_pipe[1]); 1455 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); 1456 1457 /* 1458 * Change the name of this process not to confuse --exclude-perf users 1459 * that sees 'perf' in the window up to the execvp() and thinks that 1460 * perf samples are not being excluded. 1461 */ 1462 prctl(PR_SET_NAME, "perf-exec"); 1463 1464 /* 1465 * Tell the parent we're ready to go 1466 */ 1467 close(child_ready_pipe[1]); 1468 1469 /* 1470 * Wait until the parent tells us to go. 1471 */ 1472 ret = read(go_pipe[0], &bf, 1); 1473 /* 1474 * The parent will ask for the execvp() to be performed by 1475 * writing exactly one byte, in workload.cork_fd, usually via 1476 * evlist__start_workload(). 1477 * 1478 * For cancelling the workload without actually running it, 1479 * the parent will just close workload.cork_fd, without writing 1480 * anything, i.e. read will return zero and we just exit() 1481 * here (See evlist__cancel_workload()). 1482 */ 1483 if (ret != 1) { 1484 if (ret == -1) 1485 perror("unable to read pipe"); 1486 exit(ret); 1487 } 1488 1489 execvp(argv[0], (char **)argv); 1490 1491 if (exec_error) { 1492 union sigval val; 1493 1494 val.sival_int = errno; 1495 if (sigqueue(getppid(), SIGUSR1, val)) 1496 perror(argv[0]); 1497 } else 1498 perror(argv[0]); 1499 exit(-1); 1500 } 1501 1502 if (exec_error) { 1503 struct sigaction act = { 1504 .sa_flags = SA_SIGINFO, 1505 .sa_sigaction = exec_error, 1506 }; 1507 sigaction(SIGUSR1, &act, NULL); 1508 } 1509 1510 if (target__none(target)) { 1511 if (evlist->core.threads == NULL) { 1512 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n", 1513 __func__, __LINE__); 1514 goto out_close_pipes; 1515 } 1516 perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid); 1517 } 1518 1519 close(child_ready_pipe[1]); 1520 close(go_pipe[0]); 1521 /* 1522 * wait for child to settle 1523 */ 1524 if (read(child_ready_pipe[0], &bf, 1) == -1) { 1525 perror("unable to read pipe"); 1526 goto out_close_pipes; 1527 } 1528 1529 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC); 1530 evlist->workload.cork_fd = go_pipe[1]; 1531 close(child_ready_pipe[0]); 1532 return 0; 1533 1534 out_close_pipes: 1535 close(go_pipe[0]); 1536 close(go_pipe[1]); 1537 out_close_ready_pipe: 1538 close(child_ready_pipe[0]); 1539 close(child_ready_pipe[1]); 1540 return -1; 1541 } 1542 1543 int evlist__start_workload(struct evlist *evlist) 1544 { 1545 if (evlist->workload.cork_fd >= 0) { 1546 char bf = 0; 1547 int ret; 1548 /* 1549 * Remove the cork, let it rip! 1550 */ 1551 ret = write(evlist->workload.cork_fd, &bf, 1); 1552 if (ret < 0) 1553 perror("unable to write to pipe"); 1554 1555 close(evlist->workload.cork_fd); 1556 evlist->workload.cork_fd = -1; 1557 return ret; 1558 } 1559 1560 return 0; 1561 } 1562 1563 void evlist__cancel_workload(struct evlist *evlist) 1564 { 1565 int status; 1566 1567 if (evlist->workload.cork_fd >= 0) { 1568 close(evlist->workload.cork_fd); 1569 evlist->workload.cork_fd = -1; 1570 waitpid(evlist->workload.pid, &status, WNOHANG); 1571 } 1572 } 1573 1574 int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample) 1575 { 1576 struct evsel *evsel = evlist__event2evsel(evlist, event); 1577 int ret; 1578 1579 if (!evsel) 1580 return -EFAULT; 1581 ret = evsel__parse_sample(evsel, event, sample); 1582 if (ret) 1583 return ret; 1584 if (perf_guest && sample->id) { 1585 struct perf_sample_id *sid = evlist__id2sid(evlist, sample->id); 1586 1587 if (sid) { 1588 sample->machine_pid = sid->machine_pid; 1589 sample->vcpu = sid->vcpu.cpu; 1590 } 1591 } 1592 return 0; 1593 } 1594 1595 int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp) 1596 { 1597 struct evsel *evsel = evlist__event2evsel(evlist, event); 1598 1599 if (!evsel) 1600 return -EFAULT; 1601 return evsel__parse_sample_timestamp(evsel, event, timestamp); 1602 } 1603 1604 int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size) 1605 { 1606 int printed, value; 1607 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf)); 1608 1609 switch (err) { 1610 case EACCES: 1611 case EPERM: 1612 printed = scnprintf(buf, size, 1613 "Error:\t%s.\n" 1614 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg); 1615 1616 value = perf_event_paranoid(); 1617 1618 printed += scnprintf(buf + printed, size - printed, "\nHint:\t"); 1619 1620 if (value >= 2) { 1621 printed += scnprintf(buf + printed, size - printed, 1622 "For your workloads it needs to be <= 1\nHint:\t"); 1623 } 1624 printed += scnprintf(buf + printed, size - printed, 1625 "For system wide tracing it needs to be set to -1.\n"); 1626 1627 printed += scnprintf(buf + printed, size - printed, 1628 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n" 1629 "Hint:\tThe current value is %d.", value); 1630 break; 1631 case EINVAL: { 1632 struct evsel *first = evlist__first(evlist); 1633 int max_freq; 1634 1635 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0) 1636 goto out_default; 1637 1638 if (first->core.attr.sample_freq < (u64)max_freq) 1639 goto out_default; 1640 1641 printed = scnprintf(buf, size, 1642 "Error:\t%s.\n" 1643 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n" 1644 "Hint:\tThe current value is %d and %" PRIu64 " is being requested.", 1645 emsg, max_freq, first->core.attr.sample_freq); 1646 break; 1647 } 1648 default: 1649 out_default: 1650 scnprintf(buf, size, "%s", emsg); 1651 break; 1652 } 1653 1654 return 0; 1655 } 1656 1657 int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size) 1658 { 1659 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf)); 1660 int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0; 1661 1662 switch (err) { 1663 case EPERM: 1664 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user); 1665 printed += scnprintf(buf + printed, size - printed, 1666 "Error:\t%s.\n" 1667 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n" 1668 "Hint:\tTried using %zd kB.\n", 1669 emsg, pages_max_per_user, pages_attempted); 1670 1671 if (pages_attempted >= pages_max_per_user) { 1672 printed += scnprintf(buf + printed, size - printed, 1673 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n", 1674 pages_max_per_user + pages_attempted); 1675 } 1676 1677 printed += scnprintf(buf + printed, size - printed, 1678 "Hint:\tTry using a smaller -m/--mmap-pages value."); 1679 break; 1680 default: 1681 scnprintf(buf, size, "%s", emsg); 1682 break; 1683 } 1684 1685 return 0; 1686 } 1687 1688 void evlist__to_front(struct evlist *evlist, struct evsel *move_evsel) 1689 { 1690 struct evsel *evsel, *n; 1691 LIST_HEAD(move); 1692 1693 if (move_evsel == evlist__first(evlist)) 1694 return; 1695 1696 evlist__for_each_entry_safe(evlist, n, evsel) { 1697 if (evsel__leader(evsel) == evsel__leader(move_evsel)) 1698 list_move_tail(&evsel->core.node, &move); 1699 } 1700 1701 list_splice(&move, &evlist->core.entries); 1702 } 1703 1704 struct evsel *evlist__get_tracking_event(struct evlist *evlist) 1705 { 1706 struct evsel *evsel; 1707 1708 evlist__for_each_entry(evlist, evsel) { 1709 if (evsel->tracking) 1710 return evsel; 1711 } 1712 1713 return evlist__first(evlist); 1714 } 1715 1716 void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_evsel) 1717 { 1718 struct evsel *evsel; 1719 1720 if (tracking_evsel->tracking) 1721 return; 1722 1723 evlist__for_each_entry(evlist, evsel) { 1724 if (evsel != tracking_evsel) 1725 evsel->tracking = false; 1726 } 1727 1728 tracking_evsel->tracking = true; 1729 } 1730 1731 struct evsel *evlist__findnew_tracking_event(struct evlist *evlist, bool system_wide) 1732 { 1733 struct evsel *evsel; 1734 1735 evsel = evlist__get_tracking_event(evlist); 1736 if (!evsel__is_dummy_event(evsel)) { 1737 evsel = evlist__add_aux_dummy(evlist, system_wide); 1738 if (!evsel) 1739 return NULL; 1740 1741 evlist__set_tracking_event(evlist, evsel); 1742 } else if (system_wide) { 1743 perf_evlist__go_system_wide(&evlist->core, &evsel->core); 1744 } 1745 1746 return evsel; 1747 } 1748 1749 struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str) 1750 { 1751 struct evsel *evsel; 1752 1753 evlist__for_each_entry(evlist, evsel) { 1754 if (!evsel->name) 1755 continue; 1756 if (evsel__name_is(evsel, str)) 1757 return evsel; 1758 } 1759 1760 return NULL; 1761 } 1762 1763 void evlist__toggle_bkw_mmap(struct evlist *evlist, enum bkw_mmap_state state) 1764 { 1765 enum bkw_mmap_state old_state = evlist->bkw_mmap_state; 1766 enum action { 1767 NONE, 1768 PAUSE, 1769 RESUME, 1770 } action = NONE; 1771 1772 if (!evlist->overwrite_mmap) 1773 return; 1774 1775 switch (old_state) { 1776 case BKW_MMAP_NOTREADY: { 1777 if (state != BKW_MMAP_RUNNING) 1778 goto state_err; 1779 break; 1780 } 1781 case BKW_MMAP_RUNNING: { 1782 if (state != BKW_MMAP_DATA_PENDING) 1783 goto state_err; 1784 action = PAUSE; 1785 break; 1786 } 1787 case BKW_MMAP_DATA_PENDING: { 1788 if (state != BKW_MMAP_EMPTY) 1789 goto state_err; 1790 break; 1791 } 1792 case BKW_MMAP_EMPTY: { 1793 if (state != BKW_MMAP_RUNNING) 1794 goto state_err; 1795 action = RESUME; 1796 break; 1797 } 1798 default: 1799 WARN_ONCE(1, "Shouldn't get there\n"); 1800 } 1801 1802 evlist->bkw_mmap_state = state; 1803 1804 switch (action) { 1805 case PAUSE: 1806 evlist__pause(evlist); 1807 break; 1808 case RESUME: 1809 evlist__resume(evlist); 1810 break; 1811 case NONE: 1812 default: 1813 break; 1814 } 1815 1816 state_err: 1817 return; 1818 } 1819 1820 bool evlist__exclude_kernel(struct evlist *evlist) 1821 { 1822 struct evsel *evsel; 1823 1824 evlist__for_each_entry(evlist, evsel) { 1825 if (!evsel->core.attr.exclude_kernel) 1826 return false; 1827 } 1828 1829 return true; 1830 } 1831 1832 /* 1833 * Events in data file are not collect in groups, but we still want 1834 * the group display. Set the artificial group and set the leader's 1835 * forced_leader flag to notify the display code. 1836 */ 1837 void evlist__force_leader(struct evlist *evlist) 1838 { 1839 if (evlist__nr_groups(evlist) == 0) { 1840 struct evsel *leader = evlist__first(evlist); 1841 1842 evlist__set_leader(evlist); 1843 leader->forced_leader = true; 1844 } 1845 } 1846 1847 struct evsel *evlist__reset_weak_group(struct evlist *evsel_list, struct evsel *evsel, bool close) 1848 { 1849 struct evsel *c2, *leader; 1850 bool is_open = true; 1851 1852 leader = evsel__leader(evsel); 1853 1854 pr_debug("Weak group for %s/%d failed\n", 1855 leader->name, leader->core.nr_members); 1856 1857 /* 1858 * for_each_group_member doesn't work here because it doesn't 1859 * include the first entry. 1860 */ 1861 evlist__for_each_entry(evsel_list, c2) { 1862 if (c2 == evsel) 1863 is_open = false; 1864 if (evsel__has_leader(c2, leader)) { 1865 if (is_open && close) 1866 perf_evsel__close(&c2->core); 1867 /* 1868 * We want to close all members of the group and reopen 1869 * them. Some events, like Intel topdown, require being 1870 * in a group and so keep these in the group. 1871 */ 1872 evsel__remove_from_group(c2, leader); 1873 1874 /* 1875 * Set this for all former members of the group 1876 * to indicate they get reopened. 1877 */ 1878 c2->reset_group = true; 1879 } 1880 } 1881 /* Reset the leader count if all entries were removed. */ 1882 if (leader->core.nr_members == 1) 1883 leader->core.nr_members = 0; 1884 return leader; 1885 } 1886 1887 static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close) 1888 { 1889 char *s, *p; 1890 int ret = 0, fd; 1891 1892 if (strncmp(str, "fifo:", 5)) 1893 return -EINVAL; 1894 1895 str += 5; 1896 if (!*str || *str == ',') 1897 return -EINVAL; 1898 1899 s = strdup(str); 1900 if (!s) 1901 return -ENOMEM; 1902 1903 p = strchr(s, ','); 1904 if (p) 1905 *p = '\0'; 1906 1907 /* 1908 * O_RDWR avoids POLLHUPs which is necessary to allow the other 1909 * end of a FIFO to be repeatedly opened and closed. 1910 */ 1911 fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC); 1912 if (fd < 0) { 1913 pr_err("Failed to open '%s'\n", s); 1914 ret = -errno; 1915 goto out_free; 1916 } 1917 *ctl_fd = fd; 1918 *ctl_fd_close = true; 1919 1920 if (p && *++p) { 1921 /* O_RDWR | O_NONBLOCK means the other end need not be open */ 1922 fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC); 1923 if (fd < 0) { 1924 pr_err("Failed to open '%s'\n", p); 1925 ret = -errno; 1926 goto out_free; 1927 } 1928 *ctl_fd_ack = fd; 1929 } 1930 1931 out_free: 1932 free(s); 1933 return ret; 1934 } 1935 1936 int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close) 1937 { 1938 char *comma = NULL, *endptr = NULL; 1939 1940 *ctl_fd_close = false; 1941 1942 if (strncmp(str, "fd:", 3)) 1943 return evlist__parse_control_fifo(str, ctl_fd, ctl_fd_ack, ctl_fd_close); 1944 1945 *ctl_fd = strtoul(&str[3], &endptr, 0); 1946 if (endptr == &str[3]) 1947 return -EINVAL; 1948 1949 comma = strchr(str, ','); 1950 if (comma) { 1951 if (endptr != comma) 1952 return -EINVAL; 1953 1954 *ctl_fd_ack = strtoul(comma + 1, &endptr, 0); 1955 if (endptr == comma + 1 || *endptr != '\0') 1956 return -EINVAL; 1957 } 1958 1959 return 0; 1960 } 1961 1962 void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close) 1963 { 1964 if (*ctl_fd_close) { 1965 *ctl_fd_close = false; 1966 close(ctl_fd); 1967 if (ctl_fd_ack >= 0) 1968 close(ctl_fd_ack); 1969 } 1970 } 1971 1972 int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack) 1973 { 1974 if (fd == -1) { 1975 pr_debug("Control descriptor is not initialized\n"); 1976 return 0; 1977 } 1978 1979 evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, 1980 fdarray_flag__nonfilterable | 1981 fdarray_flag__non_perf_event); 1982 if (evlist->ctl_fd.pos < 0) { 1983 evlist->ctl_fd.pos = -1; 1984 pr_err("Failed to add ctl fd entry: %m\n"); 1985 return -1; 1986 } 1987 1988 evlist->ctl_fd.fd = fd; 1989 evlist->ctl_fd.ack = ack; 1990 1991 return 0; 1992 } 1993 1994 bool evlist__ctlfd_initialized(struct evlist *evlist) 1995 { 1996 return evlist->ctl_fd.pos >= 0; 1997 } 1998 1999 int evlist__finalize_ctlfd(struct evlist *evlist) 2000 { 2001 struct pollfd *entries = evlist->core.pollfd.entries; 2002 2003 if (!evlist__ctlfd_initialized(evlist)) 2004 return 0; 2005 2006 entries[evlist->ctl_fd.pos].fd = -1; 2007 entries[evlist->ctl_fd.pos].events = 0; 2008 entries[evlist->ctl_fd.pos].revents = 0; 2009 2010 evlist->ctl_fd.pos = -1; 2011 evlist->ctl_fd.ack = -1; 2012 evlist->ctl_fd.fd = -1; 2013 2014 return 0; 2015 } 2016 2017 static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd, 2018 char *cmd_data, size_t data_size) 2019 { 2020 int err; 2021 char c; 2022 size_t bytes_read = 0; 2023 2024 *cmd = EVLIST_CTL_CMD_UNSUPPORTED; 2025 memset(cmd_data, 0, data_size); 2026 data_size--; 2027 2028 do { 2029 err = read(evlist->ctl_fd.fd, &c, 1); 2030 if (err > 0) { 2031 if (c == '\n' || c == '\0') 2032 break; 2033 cmd_data[bytes_read++] = c; 2034 if (bytes_read == data_size) 2035 break; 2036 continue; 2037 } else if (err == -1) { 2038 if (errno == EINTR) 2039 continue; 2040 if (errno == EAGAIN || errno == EWOULDBLOCK) 2041 err = 0; 2042 else 2043 pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd); 2044 } 2045 break; 2046 } while (1); 2047 2048 pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data, 2049 bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0"); 2050 2051 if (bytes_read > 0) { 2052 if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG, 2053 (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) { 2054 *cmd = EVLIST_CTL_CMD_ENABLE; 2055 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG, 2056 (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) { 2057 *cmd = EVLIST_CTL_CMD_DISABLE; 2058 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_SNAPSHOT_TAG, 2059 (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) { 2060 *cmd = EVLIST_CTL_CMD_SNAPSHOT; 2061 pr_debug("is snapshot\n"); 2062 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG, 2063 (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) { 2064 *cmd = EVLIST_CTL_CMD_EVLIST; 2065 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG, 2066 (sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) { 2067 *cmd = EVLIST_CTL_CMD_STOP; 2068 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_PING_TAG, 2069 (sizeof(EVLIST_CTL_CMD_PING_TAG)-1))) { 2070 *cmd = EVLIST_CTL_CMD_PING; 2071 } 2072 } 2073 2074 return bytes_read ? (int)bytes_read : err; 2075 } 2076 2077 int evlist__ctlfd_ack(struct evlist *evlist) 2078 { 2079 int err; 2080 2081 if (evlist->ctl_fd.ack == -1) 2082 return 0; 2083 2084 err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG, 2085 sizeof(EVLIST_CTL_CMD_ACK_TAG)); 2086 if (err == -1) 2087 pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack); 2088 2089 return err; 2090 } 2091 2092 static int get_cmd_arg(char *cmd_data, size_t cmd_size, char **arg) 2093 { 2094 char *data = cmd_data + cmd_size; 2095 2096 /* no argument */ 2097 if (!*data) 2098 return 0; 2099 2100 /* there's argument */ 2101 if (*data == ' ') { 2102 *arg = data + 1; 2103 return 1; 2104 } 2105 2106 /* malformed */ 2107 return -1; 2108 } 2109 2110 static int evlist__ctlfd_enable(struct evlist *evlist, char *cmd_data, bool enable) 2111 { 2112 struct evsel *evsel; 2113 char *name; 2114 int err; 2115 2116 err = get_cmd_arg(cmd_data, 2117 enable ? sizeof(EVLIST_CTL_CMD_ENABLE_TAG) - 1 : 2118 sizeof(EVLIST_CTL_CMD_DISABLE_TAG) - 1, 2119 &name); 2120 if (err < 0) { 2121 pr_info("failed: wrong command\n"); 2122 return -1; 2123 } 2124 2125 if (err) { 2126 evsel = evlist__find_evsel_by_str(evlist, name); 2127 if (evsel) { 2128 if (enable) 2129 evlist__enable_evsel(evlist, name); 2130 else 2131 evlist__disable_evsel(evlist, name); 2132 pr_info("Event %s %s\n", evsel->name, 2133 enable ? "enabled" : "disabled"); 2134 } else { 2135 pr_info("failed: can't find '%s' event\n", name); 2136 } 2137 } else { 2138 if (enable) { 2139 evlist__enable(evlist); 2140 pr_info(EVLIST_ENABLED_MSG); 2141 } else { 2142 evlist__disable(evlist); 2143 pr_info(EVLIST_DISABLED_MSG); 2144 } 2145 } 2146 2147 return 0; 2148 } 2149 2150 static int evlist__ctlfd_list(struct evlist *evlist, char *cmd_data) 2151 { 2152 struct perf_attr_details details = { .verbose = false, }; 2153 struct evsel *evsel; 2154 char *arg; 2155 int err; 2156 2157 err = get_cmd_arg(cmd_data, 2158 sizeof(EVLIST_CTL_CMD_EVLIST_TAG) - 1, 2159 &arg); 2160 if (err < 0) { 2161 pr_info("failed: wrong command\n"); 2162 return -1; 2163 } 2164 2165 if (err) { 2166 if (!strcmp(arg, "-v")) { 2167 details.verbose = true; 2168 } else if (!strcmp(arg, "-g")) { 2169 details.event_group = true; 2170 } else if (!strcmp(arg, "-F")) { 2171 details.freq = true; 2172 } else { 2173 pr_info("failed: wrong command\n"); 2174 return -1; 2175 } 2176 } 2177 2178 evlist__for_each_entry(evlist, evsel) 2179 evsel__fprintf(evsel, &details, stderr); 2180 2181 return 0; 2182 } 2183 2184 int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd) 2185 { 2186 int err = 0; 2187 char cmd_data[EVLIST_CTL_CMD_MAX_LEN]; 2188 int ctlfd_pos = evlist->ctl_fd.pos; 2189 struct pollfd *entries = evlist->core.pollfd.entries; 2190 2191 if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents) 2192 return 0; 2193 2194 if (entries[ctlfd_pos].revents & POLLIN) { 2195 err = evlist__ctlfd_recv(evlist, cmd, cmd_data, 2196 EVLIST_CTL_CMD_MAX_LEN); 2197 if (err > 0) { 2198 switch (*cmd) { 2199 case EVLIST_CTL_CMD_ENABLE: 2200 case EVLIST_CTL_CMD_DISABLE: 2201 err = evlist__ctlfd_enable(evlist, cmd_data, 2202 *cmd == EVLIST_CTL_CMD_ENABLE); 2203 break; 2204 case EVLIST_CTL_CMD_EVLIST: 2205 err = evlist__ctlfd_list(evlist, cmd_data); 2206 break; 2207 case EVLIST_CTL_CMD_SNAPSHOT: 2208 case EVLIST_CTL_CMD_STOP: 2209 case EVLIST_CTL_CMD_PING: 2210 break; 2211 case EVLIST_CTL_CMD_ACK: 2212 case EVLIST_CTL_CMD_UNSUPPORTED: 2213 default: 2214 pr_debug("ctlfd: unsupported %d\n", *cmd); 2215 break; 2216 } 2217 if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED || 2218 *cmd == EVLIST_CTL_CMD_SNAPSHOT)) 2219 evlist__ctlfd_ack(evlist); 2220 } 2221 } 2222 2223 if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR)) 2224 evlist__finalize_ctlfd(evlist); 2225 else 2226 entries[ctlfd_pos].revents = 0; 2227 2228 return err; 2229 } 2230 2231 /** 2232 * struct event_enable_time - perf record -D/--delay single time range. 2233 * @start: start of time range to enable events in milliseconds 2234 * @end: end of time range to enable events in milliseconds 2235 * 2236 * N.B. this structure is also accessed as an array of int. 2237 */ 2238 struct event_enable_time { 2239 int start; 2240 int end; 2241 }; 2242 2243 static int parse_event_enable_time(const char *str, struct event_enable_time *range, bool first) 2244 { 2245 const char *fmt = first ? "%u - %u %n" : " , %u - %u %n"; 2246 int ret, start, end, n; 2247 2248 ret = sscanf(str, fmt, &start, &end, &n); 2249 if (ret != 2 || end <= start) 2250 return -EINVAL; 2251 if (range) { 2252 range->start = start; 2253 range->end = end; 2254 } 2255 return n; 2256 } 2257 2258 static ssize_t parse_event_enable_times(const char *str, struct event_enable_time *range) 2259 { 2260 int incr = !!range; 2261 bool first = true; 2262 ssize_t ret, cnt; 2263 2264 for (cnt = 0; *str; cnt++) { 2265 ret = parse_event_enable_time(str, range, first); 2266 if (ret < 0) 2267 return ret; 2268 /* Check no overlap */ 2269 if (!first && range && range->start <= range[-1].end) 2270 return -EINVAL; 2271 str += ret; 2272 range += incr; 2273 first = false; 2274 } 2275 return cnt; 2276 } 2277 2278 /** 2279 * struct event_enable_timer - control structure for perf record -D/--delay. 2280 * @evlist: event list 2281 * @times: time ranges that events are enabled (N.B. this is also accessed as an 2282 * array of int) 2283 * @times_cnt: number of time ranges 2284 * @timerfd: timer file descriptor 2285 * @pollfd_pos: position in @evlist array of file descriptors to poll (fdarray) 2286 * @times_step: current position in (int *)@times)[], 2287 * refer event_enable_timer__process() 2288 * 2289 * Note, this structure is only used when there are time ranges, not when there 2290 * is only an initial delay. 2291 */ 2292 struct event_enable_timer { 2293 struct evlist *evlist; 2294 struct event_enable_time *times; 2295 size_t times_cnt; 2296 int timerfd; 2297 int pollfd_pos; 2298 size_t times_step; 2299 }; 2300 2301 static int str_to_delay(const char *str) 2302 { 2303 char *endptr; 2304 long d; 2305 2306 d = strtol(str, &endptr, 10); 2307 if (*endptr || d > INT_MAX || d < -1) 2308 return 0; 2309 return d; 2310 } 2311 2312 int evlist__parse_event_enable_time(struct evlist *evlist, struct record_opts *opts, 2313 const char *str, int unset) 2314 { 2315 enum fdarray_flags flags = fdarray_flag__nonfilterable | fdarray_flag__non_perf_event; 2316 struct event_enable_timer *eet; 2317 ssize_t times_cnt; 2318 ssize_t ret; 2319 int err; 2320 2321 if (unset) 2322 return 0; 2323 2324 opts->target.initial_delay = str_to_delay(str); 2325 if (opts->target.initial_delay) 2326 return 0; 2327 2328 ret = parse_event_enable_times(str, NULL); 2329 if (ret < 0) 2330 return ret; 2331 2332 times_cnt = ret; 2333 if (times_cnt == 0) 2334 return -EINVAL; 2335 2336 eet = zalloc(sizeof(*eet)); 2337 if (!eet) 2338 return -ENOMEM; 2339 2340 eet->times = calloc(times_cnt, sizeof(*eet->times)); 2341 if (!eet->times) { 2342 err = -ENOMEM; 2343 goto free_eet; 2344 } 2345 2346 if (parse_event_enable_times(str, eet->times) != times_cnt) { 2347 err = -EINVAL; 2348 goto free_eet_times; 2349 } 2350 2351 eet->times_cnt = times_cnt; 2352 2353 eet->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC); 2354 if (eet->timerfd == -1) { 2355 err = -errno; 2356 pr_err("timerfd_create failed: %s\n", strerror(errno)); 2357 goto free_eet_times; 2358 } 2359 2360 eet->pollfd_pos = perf_evlist__add_pollfd(&evlist->core, eet->timerfd, NULL, POLLIN, flags); 2361 if (eet->pollfd_pos < 0) { 2362 err = eet->pollfd_pos; 2363 goto close_timerfd; 2364 } 2365 2366 eet->evlist = evlist; 2367 evlist->eet = eet; 2368 opts->target.initial_delay = eet->times[0].start; 2369 2370 return 0; 2371 2372 close_timerfd: 2373 close(eet->timerfd); 2374 free_eet_times: 2375 zfree(&eet->times); 2376 free_eet: 2377 free(eet); 2378 return err; 2379 } 2380 2381 static int event_enable_timer__set_timer(struct event_enable_timer *eet, int ms) 2382 { 2383 struct itimerspec its = { 2384 .it_value.tv_sec = ms / MSEC_PER_SEC, 2385 .it_value.tv_nsec = (ms % MSEC_PER_SEC) * NSEC_PER_MSEC, 2386 }; 2387 int err = 0; 2388 2389 if (timerfd_settime(eet->timerfd, 0, &its, NULL) < 0) { 2390 err = -errno; 2391 pr_err("timerfd_settime failed: %s\n", strerror(errno)); 2392 } 2393 return err; 2394 } 2395 2396 int event_enable_timer__start(struct event_enable_timer *eet) 2397 { 2398 int ms; 2399 2400 if (!eet) 2401 return 0; 2402 2403 ms = eet->times[0].end - eet->times[0].start; 2404 eet->times_step = 1; 2405 2406 return event_enable_timer__set_timer(eet, ms); 2407 } 2408 2409 int event_enable_timer__process(struct event_enable_timer *eet) 2410 { 2411 struct pollfd *entries; 2412 short revents; 2413 2414 if (!eet) 2415 return 0; 2416 2417 entries = eet->evlist->core.pollfd.entries; 2418 revents = entries[eet->pollfd_pos].revents; 2419 entries[eet->pollfd_pos].revents = 0; 2420 2421 if (revents & POLLIN) { 2422 size_t step = eet->times_step; 2423 size_t pos = step / 2; 2424 2425 if (step & 1) { 2426 evlist__disable_non_dummy(eet->evlist); 2427 pr_info(EVLIST_DISABLED_MSG); 2428 if (pos >= eet->times_cnt - 1) { 2429 /* Disarm timer */ 2430 event_enable_timer__set_timer(eet, 0); 2431 return 1; /* Stop */ 2432 } 2433 } else { 2434 evlist__enable_non_dummy(eet->evlist); 2435 pr_info(EVLIST_ENABLED_MSG); 2436 } 2437 2438 step += 1; 2439 pos = step / 2; 2440 2441 if (pos < eet->times_cnt) { 2442 int *times = (int *)eet->times; /* Accessing 'times' as array of int */ 2443 int ms = times[step] - times[step - 1]; 2444 2445 eet->times_step = step; 2446 return event_enable_timer__set_timer(eet, ms); 2447 } 2448 } 2449 2450 return 0; 2451 } 2452 2453 void event_enable_timer__exit(struct event_enable_timer **ep) 2454 { 2455 if (!ep || !*ep) 2456 return; 2457 zfree(&(*ep)->times); 2458 zfree(ep); 2459 } 2460 2461 struct evsel *evlist__find_evsel(struct evlist *evlist, int idx) 2462 { 2463 struct evsel *evsel; 2464 2465 evlist__for_each_entry(evlist, evsel) { 2466 if (evsel->core.idx == idx) 2467 return evsel; 2468 } 2469 return NULL; 2470 } 2471 2472 int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf) 2473 { 2474 struct evsel *evsel; 2475 int printed = 0; 2476 2477 evlist__for_each_entry(evlist, evsel) { 2478 if (evsel__is_dummy_event(evsel)) 2479 continue; 2480 if (size > (strlen(evsel__name(evsel)) + (printed ? 2 : 1))) { 2481 printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "," : "", evsel__name(evsel)); 2482 } else { 2483 printed += scnprintf(bf + printed, size - printed, "%s...", printed ? "," : ""); 2484 break; 2485 } 2486 } 2487 2488 return printed; 2489 } 2490 2491 void evlist__check_mem_load_aux(struct evlist *evlist) 2492 { 2493 struct evsel *leader, *evsel, *pos; 2494 2495 /* 2496 * For some platforms, the 'mem-loads' event is required to use 2497 * together with 'mem-loads-aux' within a group and 'mem-loads-aux' 2498 * must be the group leader. Now we disable this group before reporting 2499 * because 'mem-loads-aux' is just an auxiliary event. It doesn't carry 2500 * any valid memory load information. 2501 */ 2502 evlist__for_each_entry(evlist, evsel) { 2503 leader = evsel__leader(evsel); 2504 if (leader == evsel) 2505 continue; 2506 2507 if (leader->name && strstr(leader->name, "mem-loads-aux")) { 2508 for_each_group_evsel(pos, leader) { 2509 evsel__set_leader(pos, pos); 2510 pos->core.nr_members = 0; 2511 } 2512 } 2513 } 2514 } 2515 2516 /** 2517 * evlist__warn_user_requested_cpus() - Check each evsel against requested CPUs 2518 * and warn if the user CPU list is inapplicable for the event's PMU's 2519 * CPUs. Not core PMUs list a CPU in sysfs, but this may be overwritten by a 2520 * user requested CPU and so any online CPU is applicable. Core PMUs handle 2521 * events on the CPUs in their list and otherwise the event isn't supported. 2522 * @evlist: The list of events being checked. 2523 * @cpu_list: The user provided list of CPUs. 2524 */ 2525 void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_list) 2526 { 2527 struct perf_cpu_map *user_requested_cpus; 2528 struct evsel *pos; 2529 2530 if (!cpu_list) 2531 return; 2532 2533 user_requested_cpus = perf_cpu_map__new(cpu_list); 2534 if (!user_requested_cpus) 2535 return; 2536 2537 evlist__for_each_entry(evlist, pos) { 2538 struct perf_cpu_map *intersect, *to_test; 2539 const struct perf_pmu *pmu = evsel__find_pmu(pos); 2540 2541 to_test = pmu && pmu->is_core ? pmu->cpus : cpu_map__online(); 2542 intersect = perf_cpu_map__intersect(to_test, user_requested_cpus); 2543 if (!perf_cpu_map__equal(intersect, user_requested_cpus)) { 2544 char buf[128]; 2545 2546 cpu_map__snprint(to_test, buf, sizeof(buf)); 2547 pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n", 2548 cpu_list, pmu ? pmu->name : "cpu", buf, evsel__name(pos)); 2549 } 2550 perf_cpu_map__put(intersect); 2551 } 2552 perf_cpu_map__put(user_requested_cpus); 2553 } 2554 2555 void evlist__uniquify_name(struct evlist *evlist) 2556 { 2557 char *new_name, empty_attributes[2] = ":", *attributes; 2558 struct evsel *pos; 2559 2560 if (perf_pmus__num_core_pmus() == 1) 2561 return; 2562 2563 evlist__for_each_entry(evlist, pos) { 2564 if (!evsel__is_hybrid(pos)) 2565 continue; 2566 2567 if (strchr(pos->name, '/')) 2568 continue; 2569 2570 attributes = strchr(pos->name, ':'); 2571 if (attributes) 2572 *attributes = '\0'; 2573 else 2574 attributes = empty_attributes; 2575 2576 if (asprintf(&new_name, "%s/%s/%s", pos->pmu ? pos->pmu->name : "", 2577 pos->name, attributes + 1)) { 2578 free(pos->name); 2579 pos->name = new_name; 2580 } else { 2581 *attributes = ':'; 2582 } 2583 } 2584 } 2585 2586 bool evlist__has_bpf_output(struct evlist *evlist) 2587 { 2588 struct evsel *evsel; 2589 2590 evlist__for_each_entry(evlist, evsel) { 2591 if (evsel__is_bpf_output(evsel)) 2592 return true; 2593 } 2594 2595 return false; 2596 } 2597