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 /* 9 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select 10 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu. 11 */ 12 #define __SANE_USERSPACE_TYPES__ 13 14 #include <byteswap.h> 15 #include <errno.h> 16 #include <inttypes.h> 17 #include <linux/bitops.h> 18 #include <api/fs/fs.h> 19 #include <api/fs/tracing_path.h> 20 #include <linux/hw_breakpoint.h> 21 #include <linux/perf_event.h> 22 #include <linux/compiler.h> 23 #include <linux/err.h> 24 #include <linux/zalloc.h> 25 #include <sys/ioctl.h> 26 #include <sys/resource.h> 27 #include <sys/syscall.h> 28 #include <sys/types.h> 29 #include <dirent.h> 30 #include <stdlib.h> 31 #include <perf/evsel.h> 32 #include "asm/bug.h" 33 #include "bpf_counter.h" 34 #include "callchain.h" 35 #include "cgroup.h" 36 #include "counts.h" 37 #include "event.h" 38 #include "evsel.h" 39 #include "time-utils.h" 40 #include "util/env.h" 41 #include "util/evsel_config.h" 42 #include "util/evsel_fprintf.h" 43 #include "evlist.h" 44 #include <perf/cpumap.h> 45 #include "thread_map.h" 46 #include "target.h" 47 #include "perf_regs.h" 48 #include "record.h" 49 #include "debug.h" 50 #include "trace-event.h" 51 #include "session.h" 52 #include "stat.h" 53 #include "string2.h" 54 #include "memswap.h" 55 #include "util.h" 56 #include "util/hashmap.h" 57 #include "off_cpu.h" 58 #include "pmu.h" 59 #include "pmus.h" 60 #include "drm_pmu.h" 61 #include "hwmon_pmu.h" 62 #include "tool_pmu.h" 63 #include "tp_pmu.h" 64 #include "rlimit.h" 65 #include "../perf-sys.h" 66 #include "util/parse-branch-options.h" 67 #include "util/bpf-filter.h" 68 #include "util/hist.h" 69 #include <internal/xyarray.h> 70 #include <internal/lib.h> 71 #include <internal/threadmap.h> 72 #include "util/intel-tpebs.h" 73 74 #include <linux/ctype.h> 75 76 #ifdef HAVE_LIBTRACEEVENT 77 #include <event-parse.h> 78 #endif 79 80 struct perf_missing_features perf_missing_features; 81 82 static clockid_t clockid; 83 84 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused) 85 { 86 return 0; 87 } 88 89 static bool test_attr__enabled(void) 90 { 91 static bool test_attr__enabled; 92 static bool test_attr__enabled_tested; 93 94 if (!test_attr__enabled_tested) { 95 char *dir = getenv("PERF_TEST_ATTR"); 96 97 test_attr__enabled = (dir != NULL); 98 test_attr__enabled_tested = true; 99 } 100 return test_attr__enabled; 101 } 102 103 #define __WRITE_ASS(str, fmt, data) \ 104 do { \ 105 if (fprintf(file, #str "=%"fmt "\n", data) < 0) { \ 106 perror("test attr - failed to write event file"); \ 107 fclose(file); \ 108 return -1; \ 109 } \ 110 } while (0) 111 112 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field) 113 114 static int store_event(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu, 115 int fd, int group_fd, unsigned long flags) 116 { 117 FILE *file; 118 char path[PATH_MAX]; 119 char *dir = getenv("PERF_TEST_ATTR"); 120 121 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, 122 attr->type, attr->config, fd); 123 124 file = fopen(path, "w+"); 125 if (!file) { 126 perror("test attr - failed to open event file"); 127 return -1; 128 } 129 130 if (fprintf(file, "[event-%d-%llu-%d]\n", 131 attr->type, attr->config, fd) < 0) { 132 perror("test attr - failed to write event file"); 133 fclose(file); 134 return -1; 135 } 136 137 /* syscall arguments */ 138 __WRITE_ASS(fd, "d", fd); 139 __WRITE_ASS(group_fd, "d", group_fd); 140 __WRITE_ASS(cpu, "d", cpu.cpu); 141 __WRITE_ASS(pid, "d", pid); 142 __WRITE_ASS(flags, "lu", flags); 143 144 /* struct perf_event_attr */ 145 WRITE_ASS(type, PRIu32); 146 WRITE_ASS(size, PRIu32); 147 WRITE_ASS(config, "llu"); 148 WRITE_ASS(sample_period, "llu"); 149 WRITE_ASS(sample_type, "llu"); 150 WRITE_ASS(read_format, "llu"); 151 WRITE_ASS(disabled, "d"); 152 WRITE_ASS(inherit, "d"); 153 WRITE_ASS(pinned, "d"); 154 WRITE_ASS(exclusive, "d"); 155 WRITE_ASS(exclude_user, "d"); 156 WRITE_ASS(exclude_kernel, "d"); 157 WRITE_ASS(exclude_hv, "d"); 158 WRITE_ASS(exclude_idle, "d"); 159 WRITE_ASS(mmap, "d"); 160 WRITE_ASS(comm, "d"); 161 WRITE_ASS(freq, "d"); 162 WRITE_ASS(inherit_stat, "d"); 163 WRITE_ASS(enable_on_exec, "d"); 164 WRITE_ASS(task, "d"); 165 WRITE_ASS(watermark, "d"); 166 WRITE_ASS(precise_ip, "d"); 167 WRITE_ASS(mmap_data, "d"); 168 WRITE_ASS(sample_id_all, "d"); 169 WRITE_ASS(exclude_host, "d"); 170 WRITE_ASS(exclude_guest, "d"); 171 WRITE_ASS(exclude_callchain_kernel, "d"); 172 WRITE_ASS(exclude_callchain_user, "d"); 173 WRITE_ASS(mmap2, "d"); 174 WRITE_ASS(comm_exec, "d"); 175 WRITE_ASS(context_switch, "d"); 176 WRITE_ASS(write_backward, "d"); 177 WRITE_ASS(namespaces, "d"); 178 WRITE_ASS(use_clockid, "d"); 179 WRITE_ASS(wakeup_events, PRIu32); 180 WRITE_ASS(bp_type, PRIu32); 181 WRITE_ASS(config1, "llu"); 182 WRITE_ASS(config2, "llu"); 183 WRITE_ASS(branch_sample_type, "llu"); 184 WRITE_ASS(sample_regs_user, "llu"); 185 WRITE_ASS(sample_stack_user, PRIu32); 186 187 fclose(file); 188 return 0; 189 } 190 191 #undef __WRITE_ASS 192 #undef WRITE_ASS 193 194 static void test_attr__open(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu, 195 int fd, int group_fd, unsigned long flags) 196 { 197 int errno_saved = errno; 198 199 if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) { 200 pr_err("test attr FAILED"); 201 exit(128); 202 } 203 204 errno = errno_saved; 205 } 206 207 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused) 208 { 209 } 210 211 static struct { 212 size_t size; 213 int (*init)(struct evsel *evsel); 214 void (*fini)(struct evsel *evsel); 215 } perf_evsel__object = { 216 .size = sizeof(struct evsel), 217 .init = evsel__no_extra_init, 218 .fini = evsel__no_extra_fini, 219 }; 220 221 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel), 222 void (*fini)(struct evsel *evsel)) 223 { 224 225 if (object_size == 0) 226 goto set_methods; 227 228 if (perf_evsel__object.size > object_size) 229 return -EINVAL; 230 231 perf_evsel__object.size = object_size; 232 233 set_methods: 234 if (init != NULL) 235 perf_evsel__object.init = init; 236 237 if (fini != NULL) 238 perf_evsel__object.fini = fini; 239 240 return 0; 241 } 242 243 const char *evsel__pmu_name(const struct evsel *evsel) 244 { 245 struct perf_pmu *pmu = evsel__find_pmu(evsel); 246 247 if (pmu) 248 return pmu->name; 249 250 return event_type(evsel->core.attr.type); 251 } 252 253 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 254 255 int __evsel__sample_size(u64 sample_type) 256 { 257 u64 mask = sample_type & PERF_SAMPLE_MASK; 258 int size = 0; 259 int i; 260 261 for (i = 0; i < 64; i++) { 262 if (mask & (1ULL << i)) 263 size++; 264 } 265 266 size *= sizeof(u64); 267 268 return size; 269 } 270 271 /** 272 * __perf_evsel__calc_id_pos - calculate id_pos. 273 * @sample_type: sample type 274 * 275 * This function returns the position of the event id (PERF_SAMPLE_ID or 276 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 277 * perf_record_sample. 278 */ 279 static int __perf_evsel__calc_id_pos(u64 sample_type) 280 { 281 int idx = 0; 282 283 if (sample_type & PERF_SAMPLE_IDENTIFIER) 284 return 0; 285 286 if (!(sample_type & PERF_SAMPLE_ID)) 287 return -1; 288 289 if (sample_type & PERF_SAMPLE_IP) 290 idx += 1; 291 292 if (sample_type & PERF_SAMPLE_TID) 293 idx += 1; 294 295 if (sample_type & PERF_SAMPLE_TIME) 296 idx += 1; 297 298 if (sample_type & PERF_SAMPLE_ADDR) 299 idx += 1; 300 301 return idx; 302 } 303 304 /** 305 * __perf_evsel__calc_is_pos - calculate is_pos. 306 * @sample_type: sample type 307 * 308 * This function returns the position (counting backwards) of the event id 309 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 310 * sample_id_all is used there is an id sample appended to non-sample events. 311 */ 312 static int __perf_evsel__calc_is_pos(u64 sample_type) 313 { 314 int idx = 1; 315 316 if (sample_type & PERF_SAMPLE_IDENTIFIER) 317 return 1; 318 319 if (!(sample_type & PERF_SAMPLE_ID)) 320 return -1; 321 322 if (sample_type & PERF_SAMPLE_CPU) 323 idx += 1; 324 325 if (sample_type & PERF_SAMPLE_STREAM_ID) 326 idx += 1; 327 328 return idx; 329 } 330 331 void evsel__calc_id_pos(struct evsel *evsel) 332 { 333 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type); 334 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type); 335 } 336 337 void __evsel__set_sample_bit(struct evsel *evsel, 338 enum perf_event_sample_format bit) 339 { 340 if (!(evsel->core.attr.sample_type & bit)) { 341 evsel->core.attr.sample_type |= bit; 342 evsel->sample_size += sizeof(u64); 343 evsel__calc_id_pos(evsel); 344 } 345 } 346 347 void __evsel__reset_sample_bit(struct evsel *evsel, 348 enum perf_event_sample_format bit) 349 { 350 if (evsel->core.attr.sample_type & bit) { 351 evsel->core.attr.sample_type &= ~bit; 352 evsel->sample_size -= sizeof(u64); 353 evsel__calc_id_pos(evsel); 354 } 355 } 356 357 void evsel__set_sample_id(struct evsel *evsel, 358 bool can_sample_identifier) 359 { 360 if (can_sample_identifier) { 361 evsel__reset_sample_bit(evsel, ID); 362 evsel__set_sample_bit(evsel, IDENTIFIER); 363 } else { 364 evsel__set_sample_bit(evsel, ID); 365 } 366 evsel->core.attr.read_format |= PERF_FORMAT_ID; 367 } 368 369 /** 370 * evsel__is_function_event - Return whether given evsel is a function 371 * trace event 372 * 373 * @evsel - evsel selector to be tested 374 * 375 * Return %true if event is function trace event 376 */ 377 bool evsel__is_function_event(struct evsel *evsel) 378 { 379 #define FUNCTION_EVENT "ftrace:function" 380 381 return evsel->name && 382 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT)); 383 384 #undef FUNCTION_EVENT 385 } 386 387 void evsel__init(struct evsel *evsel, 388 struct perf_event_attr *attr, int idx) 389 { 390 perf_evsel__init(&evsel->core, attr, idx); 391 evsel->tracking = !idx; 392 evsel->unit = strdup(""); 393 evsel->scale = 1.0; 394 evsel->max_events = ULONG_MAX; 395 evsel->evlist = NULL; 396 evsel->bpf_obj = NULL; 397 evsel->bpf_fd = -1; 398 INIT_LIST_HEAD(&evsel->config_terms); 399 INIT_LIST_HEAD(&evsel->bpf_counter_list); 400 INIT_LIST_HEAD(&evsel->bpf_filters); 401 perf_evsel__object.init(evsel); 402 evsel->sample_size = __evsel__sample_size(attr->sample_type); 403 evsel__calc_id_pos(evsel); 404 evsel->cmdline_group_boundary = false; 405 evsel->per_pkg_mask = NULL; 406 evsel->collect_stat = false; 407 evsel->group_pmu_name = NULL; 408 evsel->skippable = false; 409 evsel->supported = true; 410 evsel->alternate_hw_config = PERF_COUNT_HW_MAX; 411 evsel->script_output_type = -1; // FIXME: OUTPUT_TYPE_UNSET, see builtin-script.c 412 } 413 414 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 415 { 416 struct evsel *evsel = zalloc(perf_evsel__object.size); 417 418 if (!evsel) 419 return NULL; 420 evsel__init(evsel, attr, idx); 421 422 if (evsel__is_bpf_output(evsel) && !attr->sample_type) { 423 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 424 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 425 evsel->core.attr.sample_period = 1; 426 } 427 428 if (evsel__is_clock(evsel)) { 429 free((char *)evsel->unit); 430 evsel->unit = strdup("msec"); 431 evsel->scale = 1e-6; 432 } 433 434 return evsel; 435 } 436 437 int copy_config_terms(struct list_head *dst, struct list_head *src) 438 { 439 struct evsel_config_term *pos, *tmp; 440 441 list_for_each_entry(pos, src, list) { 442 tmp = malloc(sizeof(*tmp)); 443 if (tmp == NULL) 444 return -ENOMEM; 445 446 *tmp = *pos; 447 if (tmp->free_str) { 448 tmp->val.str = strdup(pos->val.str); 449 if (tmp->val.str == NULL) { 450 free(tmp); 451 return -ENOMEM; 452 } 453 } 454 list_add_tail(&tmp->list, dst); 455 } 456 return 0; 457 } 458 459 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) 460 { 461 return copy_config_terms(&dst->config_terms, &src->config_terms); 462 } 463 464 /** 465 * evsel__clone - create a new evsel copied from @orig 466 * @orig: original evsel 467 * 468 * The assumption is that @orig is not configured nor opened yet. 469 * So we only care about the attributes that can be set while it's parsed. 470 */ 471 struct evsel *evsel__clone(struct evsel *dest, struct evsel *orig) 472 { 473 struct evsel *evsel; 474 475 BUG_ON(orig->core.fd); 476 BUG_ON(orig->counts); 477 BUG_ON(orig->priv); 478 BUG_ON(orig->per_pkg_mask); 479 480 /* cannot handle BPF objects for now */ 481 if (orig->bpf_obj) 482 return NULL; 483 484 if (dest) 485 evsel = dest; 486 else 487 evsel = evsel__new(&orig->core.attr); 488 489 if (evsel == NULL) 490 return NULL; 491 492 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus); 493 evsel->core.pmu_cpus = perf_cpu_map__get(orig->core.pmu_cpus); 494 evsel->core.threads = perf_thread_map__get(orig->core.threads); 495 evsel->core.nr_members = orig->core.nr_members; 496 evsel->core.system_wide = orig->core.system_wide; 497 evsel->core.requires_cpu = orig->core.requires_cpu; 498 evsel->core.is_pmu_core = orig->core.is_pmu_core; 499 500 if (orig->name) { 501 evsel->name = strdup(orig->name); 502 if (evsel->name == NULL) 503 goto out_err; 504 } 505 if (orig->group_name) { 506 evsel->group_name = strdup(orig->group_name); 507 if (evsel->group_name == NULL) 508 goto out_err; 509 } 510 if (orig->group_pmu_name) { 511 evsel->group_pmu_name = strdup(orig->group_pmu_name); 512 if (evsel->group_pmu_name == NULL) 513 goto out_err; 514 } 515 if (orig->filter) { 516 evsel->filter = strdup(orig->filter); 517 if (evsel->filter == NULL) 518 goto out_err; 519 } 520 if (orig->metric_id) { 521 evsel->metric_id = strdup(orig->metric_id); 522 if (evsel->metric_id == NULL) 523 goto out_err; 524 } 525 evsel->cgrp = cgroup__get(orig->cgrp); 526 #ifdef HAVE_LIBTRACEEVENT 527 if (orig->tp_sys) { 528 evsel->tp_sys = strdup(orig->tp_sys); 529 if (evsel->tp_sys == NULL) 530 goto out_err; 531 } 532 if (orig->tp_name) { 533 evsel->tp_name = strdup(orig->tp_name); 534 if (evsel->tp_name == NULL) 535 goto out_err; 536 } 537 evsel->tp_format = orig->tp_format; 538 #endif 539 evsel->handler = orig->handler; 540 evsel->core.leader = orig->core.leader; 541 evsel->metric_leader = orig->metric_leader; 542 543 evsel->max_events = orig->max_events; 544 zfree(&evsel->unit); 545 if (orig->unit) { 546 evsel->unit = strdup(orig->unit); 547 if (evsel->unit == NULL) 548 goto out_err; 549 } 550 evsel->scale = orig->scale; 551 evsel->snapshot = orig->snapshot; 552 evsel->per_pkg = orig->per_pkg; 553 evsel->percore = orig->percore; 554 evsel->precise_max = orig->precise_max; 555 evsel->is_libpfm_event = orig->is_libpfm_event; 556 557 evsel->exclude_GH = orig->exclude_GH; 558 evsel->sample_read = orig->sample_read; 559 evsel->collect_stat = orig->collect_stat; 560 evsel->weak_group = orig->weak_group; 561 evsel->use_config_name = orig->use_config_name; 562 evsel->pmu = orig->pmu; 563 evsel->first_wildcard_match = orig->first_wildcard_match; 564 565 if (evsel__copy_config_terms(evsel, orig) < 0) 566 goto out_err; 567 568 evsel->alternate_hw_config = orig->alternate_hw_config; 569 570 return evsel; 571 572 out_err: 573 evsel__delete(evsel); 574 return NULL; 575 } 576 577 /* 578 * Returns pointer with encoded error via <linux/err.h> interface. 579 */ 580 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx, bool format) 581 { 582 struct perf_event_attr attr = { 583 .type = PERF_TYPE_TRACEPOINT, 584 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 585 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 586 }; 587 struct evsel *evsel = zalloc(perf_evsel__object.size); 588 int err = -ENOMEM, id = -1; 589 590 if (evsel == NULL) 591 goto out_err; 592 593 594 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 595 goto out_free; 596 597 #ifdef HAVE_LIBTRACEEVENT 598 evsel->tp_sys = strdup(sys); 599 if (!evsel->tp_sys) 600 goto out_free; 601 602 evsel->tp_name = strdup(name); 603 if (!evsel->tp_name) 604 goto out_free; 605 #endif 606 607 event_attr_init(&attr); 608 609 if (format) { 610 id = tp_pmu__id(sys, name); 611 if (id < 0) { 612 err = id; 613 goto out_free; 614 } 615 } 616 attr.config = (__u64)id; 617 attr.sample_period = 1; 618 evsel__init(evsel, &attr, idx); 619 return evsel; 620 621 out_free: 622 zfree(&evsel->name); 623 #ifdef HAVE_LIBTRACEEVENT 624 zfree(&evsel->tp_sys); 625 zfree(&evsel->tp_name); 626 #endif 627 free(evsel); 628 out_err: 629 return ERR_PTR(err); 630 } 631 632 #ifdef HAVE_LIBTRACEEVENT 633 struct tep_event *evsel__tp_format(struct evsel *evsel) 634 { 635 struct tep_event *tp_format = evsel->tp_format; 636 637 if (tp_format) 638 return tp_format; 639 640 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT) 641 return NULL; 642 643 if (!evsel->tp_sys) 644 tp_format = trace_event__tp_format_id(evsel->core.attr.config); 645 else 646 tp_format = trace_event__tp_format(evsel->tp_sys, evsel->tp_name); 647 648 if (IS_ERR(tp_format)) { 649 int err = -PTR_ERR(evsel->tp_format); 650 651 pr_err("Error getting tracepoint format '%s' '%s'(%d)\n", 652 evsel__name(evsel), strerror(err), err); 653 return NULL; 654 } 655 evsel->tp_format = tp_format; 656 return evsel->tp_format; 657 } 658 #endif 659 660 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = { 661 "cycles", 662 "instructions", 663 "cache-references", 664 "cache-misses", 665 "branches", 666 "branch-misses", 667 "bus-cycles", 668 "stalled-cycles-frontend", 669 "stalled-cycles-backend", 670 "ref-cycles", 671 }; 672 673 char *evsel__bpf_counter_events; 674 675 bool evsel__match_bpf_counter_events(const char *name) 676 { 677 int name_len; 678 bool match; 679 char *ptr; 680 681 if (!evsel__bpf_counter_events) 682 return false; 683 684 ptr = strstr(evsel__bpf_counter_events, name); 685 name_len = strlen(name); 686 687 /* check name matches a full token in evsel__bpf_counter_events */ 688 match = (ptr != NULL) && 689 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && 690 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); 691 692 return match; 693 } 694 695 static const char *__evsel__hw_name(u64 config) 696 { 697 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 698 return evsel__hw_names[config]; 699 700 return "unknown-hardware"; 701 } 702 703 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 704 { 705 int colon = 0, r = 0; 706 struct perf_event_attr *attr = &evsel->core.attr; 707 708 #define MOD_PRINT(context, mod) do { \ 709 if (!attr->exclude_##context) { \ 710 if (!colon) colon = ++r; \ 711 r += scnprintf(bf + r, size - r, "%c", mod); \ 712 } } while(0) 713 714 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 715 MOD_PRINT(kernel, 'k'); 716 MOD_PRINT(user, 'u'); 717 MOD_PRINT(hv, 'h'); 718 } 719 720 if (attr->precise_ip) { 721 if (!colon) 722 colon = ++r; 723 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 724 } 725 726 if (attr->exclude_host || attr->exclude_guest) { 727 MOD_PRINT(host, 'H'); 728 MOD_PRINT(guest, 'G'); 729 } 730 #undef MOD_PRINT 731 if (colon) 732 bf[colon - 1] = ':'; 733 return r; 734 } 735 736 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 737 { 738 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 739 } 740 741 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 742 { 743 int r = arch_evsel__hw_name(evsel, bf, size); 744 return r + evsel__add_modifiers(evsel, bf + r, size - r); 745 } 746 747 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = { 748 "cpu-clock", 749 "task-clock", 750 "page-faults", 751 "context-switches", 752 "cpu-migrations", 753 "minor-faults", 754 "major-faults", 755 "alignment-faults", 756 "emulation-faults", 757 "dummy", 758 }; 759 760 static const char *__evsel__sw_name(u64 config) 761 { 762 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 763 return evsel__sw_names[config]; 764 return "unknown-software"; 765 } 766 767 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 768 { 769 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 770 return r + evsel__add_modifiers(evsel, bf + r, size - r); 771 } 772 773 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 774 { 775 int r; 776 777 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 778 779 if (type & HW_BREAKPOINT_R) 780 r += scnprintf(bf + r, size - r, "r"); 781 782 if (type & HW_BREAKPOINT_W) 783 r += scnprintf(bf + r, size - r, "w"); 784 785 if (type & HW_BREAKPOINT_X) 786 r += scnprintf(bf + r, size - r, "x"); 787 788 return r; 789 } 790 791 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 792 { 793 struct perf_event_attr *attr = &evsel->core.attr; 794 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 795 return r + evsel__add_modifiers(evsel, bf + r, size - r); 796 } 797 798 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 799 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 800 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 801 { "LLC", "L2", }, 802 { "dTLB", "d-tlb", "Data-TLB", }, 803 { "iTLB", "i-tlb", "Instruction-TLB", }, 804 { "branch", "branches", "bpu", "btb", "bpc", }, 805 { "node", }, 806 }; 807 808 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 809 { "load", "loads", "read", }, 810 { "store", "stores", "write", }, 811 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 812 }; 813 814 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 815 { "refs", "Reference", "ops", "access", }, 816 { "misses", "miss", }, 817 }; 818 819 #define C(x) PERF_COUNT_HW_CACHE_##x 820 #define CACHE_READ (1 << C(OP_READ)) 821 #define CACHE_WRITE (1 << C(OP_WRITE)) 822 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 823 #define COP(x) (1 << x) 824 825 /* 826 * cache operation stat 827 * L1I : Read and prefetch only 828 * ITLB and BPU : Read-only 829 */ 830 static const unsigned long evsel__hw_cache_stat[C(MAX)] = { 831 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 832 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 833 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 834 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 835 [C(ITLB)] = (CACHE_READ), 836 [C(BPU)] = (CACHE_READ), 837 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 838 }; 839 840 bool evsel__is_cache_op_valid(u8 type, u8 op) 841 { 842 if (evsel__hw_cache_stat[type] & COP(op)) 843 return true; /* valid */ 844 else 845 return false; /* invalid */ 846 } 847 848 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 849 { 850 if (result) { 851 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 852 evsel__hw_cache_op[op][0], 853 evsel__hw_cache_result[result][0]); 854 } 855 856 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 857 evsel__hw_cache_op[op][1]); 858 } 859 860 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 861 { 862 u8 op, result, type = (config >> 0) & 0xff; 863 const char *err = "unknown-ext-hardware-cache-type"; 864 865 if (type >= PERF_COUNT_HW_CACHE_MAX) 866 goto out_err; 867 868 op = (config >> 8) & 0xff; 869 err = "unknown-ext-hardware-cache-op"; 870 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 871 goto out_err; 872 873 result = (config >> 16) & 0xff; 874 err = "unknown-ext-hardware-cache-result"; 875 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 876 goto out_err; 877 878 err = "invalid-cache"; 879 if (!evsel__is_cache_op_valid(type, op)) 880 goto out_err; 881 882 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 883 out_err: 884 return scnprintf(bf, size, "%s", err); 885 } 886 887 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 888 { 889 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 890 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 891 } 892 893 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 894 { 895 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 896 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 897 } 898 899 const char *evsel__name(struct evsel *evsel) 900 { 901 char bf[128]; 902 903 if (!evsel) 904 goto out_unknown; 905 906 if (evsel->name) 907 return evsel->name; 908 909 switch (evsel->core.attr.type) { 910 case PERF_TYPE_RAW: 911 evsel__raw_name(evsel, bf, sizeof(bf)); 912 break; 913 914 case PERF_TYPE_HARDWARE: 915 evsel__hw_name(evsel, bf, sizeof(bf)); 916 break; 917 918 case PERF_TYPE_HW_CACHE: 919 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 920 break; 921 922 case PERF_TYPE_SOFTWARE: 923 evsel__sw_name(evsel, bf, sizeof(bf)); 924 break; 925 926 case PERF_TYPE_TRACEPOINT: 927 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 928 break; 929 930 case PERF_TYPE_BREAKPOINT: 931 evsel__bp_name(evsel, bf, sizeof(bf)); 932 break; 933 934 case PERF_PMU_TYPE_TOOL: 935 scnprintf(bf, sizeof(bf), "%s", evsel__tool_pmu_event_name(evsel)); 936 break; 937 938 default: 939 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 940 evsel->core.attr.type); 941 break; 942 } 943 944 evsel->name = strdup(bf); 945 946 if (evsel->name) 947 return evsel->name; 948 out_unknown: 949 return "unknown"; 950 } 951 952 bool evsel__name_is(struct evsel *evsel, const char *name) 953 { 954 return !strcmp(evsel__name(evsel), name); 955 } 956 957 const char *evsel__metric_id(const struct evsel *evsel) 958 { 959 if (evsel->metric_id) 960 return evsel->metric_id; 961 962 if (evsel__is_tool(evsel)) 963 return evsel__tool_pmu_event_name(evsel); 964 965 return "unknown"; 966 } 967 968 const char *evsel__group_name(struct evsel *evsel) 969 { 970 return evsel->group_name ?: "anon group"; 971 } 972 973 /* 974 * Returns the group details for the specified leader, 975 * with following rules. 976 * 977 * For record -e '{cycles,instructions}' 978 * 'anon group { cycles:u, instructions:u }' 979 * 980 * For record -e 'cycles,instructions' and report --group 981 * 'cycles:u, instructions:u' 982 */ 983 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 984 { 985 int ret = 0; 986 bool first = true; 987 struct evsel *pos; 988 const char *group_name = evsel__group_name(evsel); 989 990 if (!evsel->forced_leader) 991 ret = scnprintf(buf, size, "%s { ", group_name); 992 993 for_each_group_evsel(pos, evsel) { 994 if (symbol_conf.skip_empty && 995 evsel__hists(pos)->stats.nr_samples == 0) 996 continue; 997 998 ret += scnprintf(buf + ret, size - ret, "%s%s", 999 first ? "" : ", ", evsel__name(pos)); 1000 first = false; 1001 } 1002 1003 if (!evsel->forced_leader) 1004 ret += scnprintf(buf + ret, size - ret, " }"); 1005 1006 return ret; 1007 } 1008 1009 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 1010 struct callchain_param *param) 1011 { 1012 bool function = evsel__is_function_event(evsel); 1013 struct perf_event_attr *attr = &evsel->core.attr; 1014 1015 evsel__set_sample_bit(evsel, CALLCHAIN); 1016 1017 attr->sample_max_stack = param->max_stack; 1018 1019 if (opts->kernel_callchains) 1020 attr->exclude_callchain_user = 1; 1021 if (opts->user_callchains) 1022 attr->exclude_callchain_kernel = 1; 1023 if (param->record_mode == CALLCHAIN_LBR) { 1024 if (!opts->branch_stack) { 1025 if (attr->exclude_user) { 1026 pr_warning("LBR callstack option is only available " 1027 "to get user callchain information. " 1028 "Falling back to framepointers.\n"); 1029 } else { 1030 evsel__set_sample_bit(evsel, BRANCH_STACK); 1031 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 1032 PERF_SAMPLE_BRANCH_CALL_STACK | 1033 PERF_SAMPLE_BRANCH_NO_CYCLES | 1034 PERF_SAMPLE_BRANCH_NO_FLAGS | 1035 PERF_SAMPLE_BRANCH_HW_INDEX; 1036 } 1037 } else 1038 pr_warning("Cannot use LBR callstack with branch stack. " 1039 "Falling back to framepointers.\n"); 1040 } 1041 1042 if (param->record_mode == CALLCHAIN_DWARF) { 1043 if (!function) { 1044 const char *arch = perf_env__arch(evsel__env(evsel)); 1045 1046 evsel__set_sample_bit(evsel, REGS_USER); 1047 evsel__set_sample_bit(evsel, STACK_USER); 1048 if (opts->sample_user_regs && 1049 DWARF_MINIMAL_REGS(arch) != arch__user_reg_mask()) { 1050 attr->sample_regs_user |= DWARF_MINIMAL_REGS(arch); 1051 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 1052 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 1053 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 1054 } else { 1055 attr->sample_regs_user |= arch__user_reg_mask(); 1056 } 1057 attr->sample_stack_user = param->dump_size; 1058 attr->exclude_callchain_user = 1; 1059 } else { 1060 pr_info("Cannot use DWARF unwind for function trace event," 1061 " falling back to framepointers.\n"); 1062 } 1063 } 1064 1065 if (function) { 1066 pr_info("Disabling user space callchains for function trace event.\n"); 1067 attr->exclude_callchain_user = 1; 1068 } 1069 1070 if (param->defer && !attr->exclude_callchain_user) 1071 attr->defer_callchain = 1; 1072 } 1073 1074 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 1075 struct callchain_param *param) 1076 { 1077 if (param->enabled) 1078 return __evsel__config_callchain(evsel, opts, param); 1079 } 1080 1081 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param) 1082 { 1083 struct perf_event_attr *attr = &evsel->core.attr; 1084 1085 evsel__reset_sample_bit(evsel, CALLCHAIN); 1086 if (param->record_mode == CALLCHAIN_LBR) { 1087 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1088 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 1089 PERF_SAMPLE_BRANCH_CALL_STACK | 1090 PERF_SAMPLE_BRANCH_HW_INDEX); 1091 } 1092 if (param->record_mode == CALLCHAIN_DWARF) { 1093 evsel__reset_sample_bit(evsel, REGS_USER); 1094 evsel__reset_sample_bit(evsel, STACK_USER); 1095 } 1096 } 1097 1098 static void evsel__apply_ratio_to_prev(struct evsel *evsel, 1099 struct perf_event_attr *attr, 1100 struct record_opts *opts, 1101 const char *buf) 1102 { 1103 struct perf_event_attr *prev_attr = NULL; 1104 struct evsel *evsel_prev = NULL; 1105 u64 type = evsel->core.attr.sample_type; 1106 u64 prev_type = 0; 1107 double rtp; 1108 1109 rtp = strtod(buf, NULL); 1110 if (rtp <= 0) { 1111 pr_err("Invalid ratio-to-prev value %lf\n", rtp); 1112 return; 1113 } 1114 if (evsel == evsel__leader(evsel)) { 1115 pr_err("Invalid use of ratio-to-prev term without preceding element in group\n"); 1116 return; 1117 } 1118 if (!evsel->pmu->is_core) { 1119 pr_err("Event using ratio-to-prev term must have a core PMU\n"); 1120 return; 1121 } 1122 1123 evsel_prev = evsel__prev(evsel); 1124 if (!evsel_prev) { 1125 pr_err("Previous event does not exist.\n"); 1126 return; 1127 } 1128 1129 if (evsel_prev->pmu->type != evsel->pmu->type) { 1130 pr_err("Compared events (\"%s\", \"%s\") must have same PMU\n", 1131 evsel->name, evsel_prev->name); 1132 return; 1133 } 1134 1135 prev_attr = &evsel_prev->core.attr; 1136 prev_type = evsel_prev->core.attr.sample_type; 1137 1138 if (!(prev_type & PERF_SAMPLE_PERIOD)) { 1139 attr->sample_period = prev_attr->sample_period * rtp; 1140 attr->freq = 0; 1141 evsel__reset_sample_bit(evsel, PERIOD); 1142 } else if (!(type & PERF_SAMPLE_PERIOD)) { 1143 prev_attr->sample_period = attr->sample_period / rtp; 1144 prev_attr->freq = 0; 1145 evsel__reset_sample_bit(evsel_prev, PERIOD); 1146 } else { 1147 if (opts->user_interval != ULLONG_MAX) { 1148 prev_attr->sample_period = opts->user_interval; 1149 attr->sample_period = prev_attr->sample_period * rtp; 1150 prev_attr->freq = 0; 1151 attr->freq = 0; 1152 evsel__reset_sample_bit(evsel_prev, PERIOD); 1153 evsel__reset_sample_bit(evsel, PERIOD); 1154 } else { 1155 pr_err("Event period term or count (-c) must be set when using ratio-to-prev term.\n"); 1156 return; 1157 } 1158 } 1159 1160 arch_evsel__apply_ratio_to_prev(evsel, attr); 1161 } 1162 1163 static void evsel__apply_config_terms(struct evsel *evsel, 1164 struct record_opts *opts, bool track) 1165 { 1166 struct evsel_config_term *term; 1167 struct list_head *config_terms = &evsel->config_terms; 1168 struct perf_event_attr *attr = &evsel->core.attr; 1169 /* callgraph default */ 1170 struct callchain_param param = { 1171 .record_mode = callchain_param.record_mode, 1172 }; 1173 u32 dump_size = 0; 1174 int max_stack = 0; 1175 const char *callgraph_buf = NULL; 1176 const char *rtp_buf = NULL; 1177 1178 list_for_each_entry(term, config_terms, list) { 1179 switch (term->type) { 1180 case EVSEL__CONFIG_TERM_PERIOD: 1181 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 1182 attr->sample_period = term->val.period; 1183 attr->freq = 0; 1184 evsel__reset_sample_bit(evsel, PERIOD); 1185 } 1186 break; 1187 case EVSEL__CONFIG_TERM_FREQ: 1188 if (!(term->weak && opts->user_freq != UINT_MAX)) { 1189 attr->sample_freq = term->val.freq; 1190 attr->freq = 1; 1191 evsel__set_sample_bit(evsel, PERIOD); 1192 } 1193 break; 1194 case EVSEL__CONFIG_TERM_TIME: 1195 if (term->val.time) 1196 evsel__set_sample_bit(evsel, TIME); 1197 else 1198 evsel__reset_sample_bit(evsel, TIME); 1199 break; 1200 case EVSEL__CONFIG_TERM_CALLGRAPH: 1201 callgraph_buf = term->val.str; 1202 break; 1203 case EVSEL__CONFIG_TERM_BRANCH: 1204 if (term->val.str && strcmp(term->val.str, "no")) { 1205 evsel__set_sample_bit(evsel, BRANCH_STACK); 1206 parse_branch_str(term->val.str, 1207 &attr->branch_sample_type); 1208 } else 1209 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1210 break; 1211 case EVSEL__CONFIG_TERM_STACK_USER: 1212 dump_size = term->val.stack_user; 1213 break; 1214 case EVSEL__CONFIG_TERM_MAX_STACK: 1215 max_stack = term->val.max_stack; 1216 break; 1217 case EVSEL__CONFIG_TERM_MAX_EVENTS: 1218 evsel->max_events = term->val.max_events; 1219 break; 1220 case EVSEL__CONFIG_TERM_INHERIT: 1221 /* 1222 * attr->inherit should has already been set by 1223 * evsel__config. If user explicitly set 1224 * inherit using config terms, override global 1225 * opt->no_inherit setting. 1226 */ 1227 attr->inherit = term->val.inherit ? 1 : 0; 1228 break; 1229 case EVSEL__CONFIG_TERM_OVERWRITE: 1230 attr->write_backward = term->val.overwrite ? 1 : 0; 1231 break; 1232 case EVSEL__CONFIG_TERM_DRV_CFG: 1233 break; 1234 case EVSEL__CONFIG_TERM_PERCORE: 1235 break; 1236 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 1237 attr->aux_output = term->val.aux_output ? 1 : 0; 1238 break; 1239 case EVSEL__CONFIG_TERM_AUX_ACTION: 1240 /* Already applied by auxtrace */ 1241 break; 1242 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 1243 /* Already applied by auxtrace */ 1244 break; 1245 case EVSEL__CONFIG_TERM_CFG_CHG: 1246 break; 1247 case EVSEL__CONFIG_TERM_RATIO_TO_PREV: 1248 rtp_buf = term->val.str; 1249 break; 1250 default: 1251 break; 1252 } 1253 } 1254 1255 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 1256 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 1257 bool sample_address = false; 1258 1259 if (max_stack) { 1260 param.max_stack = max_stack; 1261 if (callgraph_buf == NULL) 1262 callgraph_buf = "fp"; 1263 } 1264 1265 /* parse callgraph parameters */ 1266 if (callgraph_buf != NULL) { 1267 if (!strcmp(callgraph_buf, "no")) { 1268 param.enabled = false; 1269 param.record_mode = CALLCHAIN_NONE; 1270 } else { 1271 param.enabled = true; 1272 if (parse_callchain_record(callgraph_buf, ¶m)) { 1273 pr_err("per-event callgraph setting for %s failed. " 1274 "Apply callgraph global setting for it\n", 1275 evsel->name); 1276 return; 1277 } 1278 if (param.record_mode == CALLCHAIN_DWARF) 1279 sample_address = true; 1280 } 1281 } 1282 if (dump_size > 0) { 1283 dump_size = round_up(dump_size, sizeof(u64)); 1284 param.dump_size = dump_size; 1285 } 1286 1287 /* If global callgraph set, clear it */ 1288 if (callchain_param.enabled) 1289 evsel__reset_callgraph(evsel, &callchain_param); 1290 1291 /* set perf-event callgraph */ 1292 if (param.enabled) { 1293 if (sample_address) { 1294 evsel__set_sample_bit(evsel, ADDR); 1295 evsel__set_sample_bit(evsel, DATA_SRC); 1296 evsel->core.attr.mmap_data = track; 1297 } 1298 evsel__config_callchain(evsel, opts, ¶m); 1299 } 1300 } 1301 if (rtp_buf) 1302 evsel__apply_ratio_to_prev(evsel, attr, opts, rtp_buf); 1303 } 1304 1305 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 1306 { 1307 struct evsel_config_term *term, *found_term = NULL; 1308 1309 list_for_each_entry(term, &evsel->config_terms, list) { 1310 if (term->type == type) 1311 found_term = term; 1312 } 1313 1314 return found_term; 1315 } 1316 1317 void __weak arch_evsel__set_sample_weight(struct evsel *evsel) 1318 { 1319 evsel__set_sample_bit(evsel, WEIGHT); 1320 } 1321 1322 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, 1323 struct perf_event_attr *attr __maybe_unused) 1324 { 1325 } 1326 1327 void __weak arch_evsel__apply_ratio_to_prev(struct evsel *evsel __maybe_unused, 1328 struct perf_event_attr *attr __maybe_unused) 1329 { 1330 } 1331 1332 static void evsel__set_default_freq_period(struct record_opts *opts, 1333 struct perf_event_attr *attr) 1334 { 1335 if (opts->freq) { 1336 attr->freq = 1; 1337 attr->sample_freq = opts->freq; 1338 } else { 1339 attr->sample_period = opts->default_interval; 1340 } 1341 } 1342 1343 bool evsel__is_offcpu_event(struct evsel *evsel) 1344 { 1345 return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT) && 1346 evsel->core.attr.sample_type & PERF_SAMPLE_RAW; 1347 } 1348 1349 /* 1350 * The enable_on_exec/disabled value strategy: 1351 * 1352 * 1) For any type of traced program: 1353 * - all independent events and group leaders are disabled 1354 * - all group members are enabled 1355 * 1356 * Group members are ruled by group leaders. They need to 1357 * be enabled, because the group scheduling relies on that. 1358 * 1359 * 2) For traced programs executed by perf: 1360 * - all independent events and group leaders have 1361 * enable_on_exec set 1362 * - we don't specifically enable or disable any event during 1363 * the record command 1364 * 1365 * Independent events and group leaders are initially disabled 1366 * and get enabled by exec. Group members are ruled by group 1367 * leaders as stated in 1). 1368 * 1369 * 3) For traced programs attached by perf (pid/tid): 1370 * - we specifically enable or disable all events during 1371 * the record command 1372 * 1373 * When attaching events to already running traced we 1374 * enable/disable events specifically, as there's no 1375 * initial traced exec call. 1376 */ 1377 void evsel__config(struct evsel *evsel, struct record_opts *opts, 1378 struct callchain_param *callchain) 1379 { 1380 struct evsel *leader = evsel__leader(evsel); 1381 struct perf_event_attr *attr = &evsel->core.attr; 1382 int track = evsel->tracking; 1383 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 1384 1385 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 1386 attr->inherit = target__has_cpu(&opts->target) ? 0 : !opts->no_inherit; 1387 attr->write_backward = opts->overwrite ? 1 : 0; 1388 attr->read_format = PERF_FORMAT_LOST; 1389 1390 evsel__set_sample_bit(evsel, IP); 1391 evsel__set_sample_bit(evsel, TID); 1392 1393 if (evsel->sample_read) { 1394 evsel__set_sample_bit(evsel, READ); 1395 1396 /* 1397 * We need ID even in case of single event, because 1398 * PERF_SAMPLE_READ process ID specific data. 1399 */ 1400 evsel__set_sample_id(evsel, false); 1401 1402 /* 1403 * Apply group format only if we belong to group 1404 * with more than one members. 1405 */ 1406 if (leader->core.nr_members > 1) { 1407 attr->read_format |= PERF_FORMAT_GROUP; 1408 } 1409 1410 /* 1411 * Inherit + SAMPLE_READ requires SAMPLE_TID in the read_format 1412 */ 1413 if (attr->inherit) { 1414 evsel__set_sample_bit(evsel, TID); 1415 evsel->core.attr.read_format |= 1416 PERF_FORMAT_ID; 1417 } 1418 } 1419 1420 /* 1421 * We default some events to have a default interval. But keep 1422 * it a weak assumption overridable by the user. 1423 */ 1424 if ((evsel->is_libpfm_event && !attr->sample_period) || 1425 (!evsel->is_libpfm_event && (!attr->sample_period || 1426 opts->user_freq != UINT_MAX || 1427 opts->user_interval != ULLONG_MAX))) 1428 evsel__set_default_freq_period(opts, attr); 1429 1430 /* 1431 * If attr->freq was set (here or earlier), ask for period 1432 * to be sampled. 1433 */ 1434 if (attr->freq) 1435 evsel__set_sample_bit(evsel, PERIOD); 1436 1437 if (opts->no_samples) 1438 attr->sample_freq = 0; 1439 1440 if (opts->inherit_stat) { 1441 evsel->core.attr.read_format |= 1442 PERF_FORMAT_TOTAL_TIME_ENABLED | 1443 PERF_FORMAT_TOTAL_TIME_RUNNING | 1444 PERF_FORMAT_ID; 1445 attr->inherit_stat = 1; 1446 } 1447 1448 if (opts->sample_address) { 1449 evsel__set_sample_bit(evsel, ADDR); 1450 attr->mmap_data = track; 1451 } 1452 1453 /* 1454 * We don't allow user space callchains for function trace 1455 * event, due to issues with page faults while tracing page 1456 * fault handler and its overall trickiness nature. 1457 */ 1458 if (evsel__is_function_event(evsel)) 1459 evsel->core.attr.exclude_callchain_user = 1; 1460 1461 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1462 evsel__config_callchain(evsel, opts, callchain); 1463 1464 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1465 !evsel__is_dummy_event(evsel)) { 1466 attr->sample_regs_intr = opts->sample_intr_regs; 1467 evsel__set_sample_bit(evsel, REGS_INTR); 1468 } 1469 1470 if (opts->sample_user_regs && !evsel->no_aux_samples && 1471 !evsel__is_dummy_event(evsel)) { 1472 attr->sample_regs_user |= opts->sample_user_regs; 1473 evsel__set_sample_bit(evsel, REGS_USER); 1474 } 1475 1476 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1477 evsel__set_sample_bit(evsel, CPU); 1478 1479 /* 1480 * When the user explicitly disabled time don't force it here. 1481 */ 1482 if (opts->sample_time && 1483 (!perf_missing_features.sample_id_all && 1484 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1485 opts->sample_time_set))) 1486 evsel__set_sample_bit(evsel, TIME); 1487 1488 if (opts->raw_samples && !evsel->no_aux_samples) { 1489 evsel__set_sample_bit(evsel, TIME); 1490 evsel__set_sample_bit(evsel, RAW); 1491 evsel__set_sample_bit(evsel, CPU); 1492 } 1493 1494 if (opts->sample_data_src) 1495 evsel__set_sample_bit(evsel, DATA_SRC); 1496 1497 if (opts->sample_phys_addr) 1498 evsel__set_sample_bit(evsel, PHYS_ADDR); 1499 1500 if (opts->no_buffering) { 1501 attr->watermark = 0; 1502 attr->wakeup_events = 1; 1503 } 1504 if (opts->branch_stack && !evsel->no_aux_samples) { 1505 evsel__set_sample_bit(evsel, BRANCH_STACK); 1506 attr->branch_sample_type = opts->branch_stack; 1507 } 1508 1509 if (opts->sample_weight || evsel->retire_lat) { 1510 arch_evsel__set_sample_weight(evsel); 1511 evsel->retire_lat = false; 1512 } 1513 attr->task = track; 1514 attr->mmap = track; 1515 attr->mmap2 = track && !perf_missing_features.mmap2; 1516 attr->comm = track; 1517 attr->build_id = track && opts->build_id; 1518 attr->defer_output = track && callchain && callchain->defer; 1519 1520 /* 1521 * ksymbol is tracked separately with text poke because it needs to be 1522 * system wide and enabled immediately. 1523 */ 1524 if (!opts->text_poke) 1525 attr->ksymbol = track && !perf_missing_features.ksymbol; 1526 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1527 1528 if (opts->record_namespaces) 1529 attr->namespaces = track; 1530 1531 if (opts->record_cgroup) { 1532 attr->cgroup = track && !perf_missing_features.cgroup; 1533 evsel__set_sample_bit(evsel, CGROUP); 1534 } 1535 1536 if (opts->sample_data_page_size) 1537 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); 1538 1539 if (opts->sample_code_page_size) 1540 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); 1541 1542 if (opts->record_switch_events) 1543 attr->context_switch = track; 1544 1545 if (opts->sample_transaction) 1546 evsel__set_sample_bit(evsel, TRANSACTION); 1547 1548 if (opts->running_time) { 1549 evsel->core.attr.read_format |= 1550 PERF_FORMAT_TOTAL_TIME_ENABLED | 1551 PERF_FORMAT_TOTAL_TIME_RUNNING; 1552 } 1553 1554 /* 1555 * XXX see the function comment above 1556 * 1557 * Disabling only independent events or group leaders, 1558 * keeping group members enabled. 1559 */ 1560 if (evsel__is_group_leader(evsel)) 1561 attr->disabled = 1; 1562 1563 /* 1564 * Setting enable_on_exec for independent events and 1565 * group leaders for traced executed by perf. 1566 */ 1567 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1568 !opts->target.initial_delay) 1569 attr->enable_on_exec = 1; 1570 1571 if (evsel->immediate) { 1572 attr->disabled = 0; 1573 attr->enable_on_exec = 0; 1574 } 1575 1576 clockid = opts->clockid; 1577 if (opts->use_clockid) { 1578 attr->use_clockid = 1; 1579 attr->clockid = opts->clockid; 1580 } 1581 1582 if (evsel->precise_max) 1583 attr->precise_ip = 3; 1584 1585 if (opts->all_user) { 1586 attr->exclude_kernel = 1; 1587 attr->exclude_user = 0; 1588 } 1589 1590 if (opts->all_kernel) { 1591 attr->exclude_kernel = 0; 1592 attr->exclude_user = 1; 1593 } 1594 1595 if (evsel->core.pmu_cpus || evsel->unit) 1596 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1597 1598 /* 1599 * Apply event specific term settings, 1600 * it overloads any global configuration. 1601 */ 1602 evsel__apply_config_terms(evsel, opts, track); 1603 1604 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1605 1606 /* The --period option takes the precedence. */ 1607 if (opts->period_set) { 1608 if (opts->period) 1609 evsel__set_sample_bit(evsel, PERIOD); 1610 else 1611 evsel__reset_sample_bit(evsel, PERIOD); 1612 } 1613 1614 /* 1615 * A dummy event never triggers any actual counter and therefore 1616 * cannot be used with branch_stack. 1617 * 1618 * For initial_delay, a dummy event is added implicitly. 1619 * The software event will trigger -EOPNOTSUPP error out, 1620 * if BRANCH_STACK bit is set. 1621 */ 1622 if (evsel__is_dummy_event(evsel)) 1623 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1624 1625 if (evsel__is_offcpu_event(evsel)) { 1626 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; 1627 attr->inherit = 0; 1628 } 1629 1630 arch__post_evsel_config(evsel, attr); 1631 } 1632 1633 int evsel__set_filter(struct evsel *evsel, const char *filter) 1634 { 1635 char *new_filter = strdup(filter); 1636 1637 if (new_filter != NULL) { 1638 free(evsel->filter); 1639 evsel->filter = new_filter; 1640 return 0; 1641 } 1642 1643 return -1; 1644 } 1645 1646 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1647 { 1648 char *new_filter; 1649 1650 if (evsel->filter == NULL) 1651 return evsel__set_filter(evsel, filter); 1652 1653 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1654 free(evsel->filter); 1655 evsel->filter = new_filter; 1656 return 0; 1657 } 1658 1659 return -1; 1660 } 1661 1662 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1663 { 1664 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1665 } 1666 1667 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1668 { 1669 return evsel__append_filter(evsel, "%s,%s", filter); 1670 } 1671 1672 /* Caller has to clear disabled after going through all CPUs. */ 1673 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx) 1674 { 1675 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); 1676 } 1677 1678 int evsel__enable(struct evsel *evsel) 1679 { 1680 int err = perf_evsel__enable(&evsel->core); 1681 1682 if (!err) 1683 evsel->disabled = false; 1684 return err; 1685 } 1686 1687 /* Caller has to set disabled after going through all CPUs. */ 1688 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx) 1689 { 1690 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); 1691 } 1692 1693 int evsel__disable(struct evsel *evsel) 1694 { 1695 int err = perf_evsel__disable(&evsel->core); 1696 /* 1697 * We mark it disabled here so that tools that disable a event can 1698 * ignore events after they disable it. I.e. the ring buffer may have 1699 * already a few more events queued up before the kernel got the stop 1700 * request. 1701 */ 1702 if (!err) 1703 evsel->disabled = true; 1704 1705 return err; 1706 } 1707 1708 void free_config_terms(struct list_head *config_terms) 1709 { 1710 struct evsel_config_term *term, *h; 1711 1712 list_for_each_entry_safe(term, h, config_terms, list) { 1713 list_del_init(&term->list); 1714 if (term->free_str) 1715 zfree(&term->val.str); 1716 free(term); 1717 } 1718 } 1719 1720 static void evsel__free_config_terms(struct evsel *evsel) 1721 { 1722 free_config_terms(&evsel->config_terms); 1723 } 1724 1725 static void (*evsel__priv_destructor)(void *priv); 1726 1727 void evsel__set_priv_destructor(void (*destructor)(void *priv)) 1728 { 1729 assert(evsel__priv_destructor == NULL); 1730 1731 evsel__priv_destructor = destructor; 1732 } 1733 1734 void evsel__exit(struct evsel *evsel) 1735 { 1736 assert(list_empty(&evsel->core.node)); 1737 assert(evsel->evlist == NULL); 1738 if (evsel__is_retire_lat(evsel)) 1739 evsel__tpebs_close(evsel); 1740 bpf_counter__destroy(evsel); 1741 perf_bpf_filter__destroy(evsel); 1742 evsel__free_counts(evsel); 1743 perf_evsel__free_fd(&evsel->core); 1744 perf_evsel__free_id(&evsel->core); 1745 evsel__free_config_terms(evsel); 1746 cgroup__put(evsel->cgrp); 1747 perf_evsel__exit(&evsel->core); 1748 zfree(&evsel->group_name); 1749 zfree(&evsel->name); 1750 #ifdef HAVE_LIBTRACEEVENT 1751 zfree(&evsel->tp_sys); 1752 zfree(&evsel->tp_name); 1753 #endif 1754 zfree(&evsel->filter); 1755 zfree(&evsel->group_pmu_name); 1756 zfree(&evsel->unit); 1757 zfree(&evsel->metric_id); 1758 evsel__zero_per_pkg(evsel); 1759 hashmap__free(evsel->per_pkg_mask); 1760 evsel->per_pkg_mask = NULL; 1761 if (evsel__priv_destructor) 1762 evsel__priv_destructor(evsel->priv); 1763 perf_evsel__object.fini(evsel); 1764 if (evsel__tool_event(evsel) == TOOL_PMU__EVENT_SYSTEM_TIME || 1765 evsel__tool_event(evsel) == TOOL_PMU__EVENT_USER_TIME) 1766 xyarray__delete(evsel->start_times); 1767 } 1768 1769 void evsel__delete(struct evsel *evsel) 1770 { 1771 if (!evsel) 1772 return; 1773 1774 evsel__exit(evsel); 1775 free(evsel); 1776 } 1777 1778 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread, 1779 struct perf_counts_values *count) 1780 { 1781 struct perf_counts_values tmp; 1782 1783 if (!evsel->prev_raw_counts) 1784 return; 1785 1786 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); 1787 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; 1788 1789 count->val = count->val - tmp.val; 1790 count->ena = count->ena - tmp.ena; 1791 count->run = count->run - tmp.run; 1792 } 1793 1794 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) 1795 { 1796 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); 1797 1798 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); 1799 } 1800 1801 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, 1802 u64 val, u64 ena, u64 run, u64 lost) 1803 { 1804 struct perf_counts_values *count; 1805 1806 count = perf_counts(counter->counts, cpu_map_idx, thread); 1807 1808 if (evsel__is_retire_lat(counter)) { 1809 evsel__tpebs_read(counter, cpu_map_idx, thread); 1810 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1811 return; 1812 } 1813 1814 count->val = val; 1815 count->ena = ena; 1816 count->run = run; 1817 count->lost = lost; 1818 1819 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1820 } 1821 1822 static bool evsel__group_has_tpebs(struct evsel *leader) 1823 { 1824 struct evsel *evsel; 1825 1826 for_each_group_evsel(evsel, leader) { 1827 if (evsel__is_retire_lat(evsel)) 1828 return true; 1829 } 1830 return false; 1831 } 1832 1833 static u64 evsel__group_read_nr_members(struct evsel *leader) 1834 { 1835 u64 nr = leader->core.nr_members; 1836 struct evsel *evsel; 1837 1838 for_each_group_evsel(evsel, leader) { 1839 if (evsel__is_retire_lat(evsel)) 1840 nr--; 1841 } 1842 return nr; 1843 } 1844 1845 static u64 evsel__group_read_size(struct evsel *leader) 1846 { 1847 u64 read_format = leader->core.attr.read_format; 1848 int entry = sizeof(u64); /* value */ 1849 int size = 0; 1850 int nr = 1; 1851 1852 if (!evsel__group_has_tpebs(leader)) 1853 return perf_evsel__read_size(&leader->core); 1854 1855 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1856 size += sizeof(u64); 1857 1858 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1859 size += sizeof(u64); 1860 1861 if (read_format & PERF_FORMAT_ID) 1862 entry += sizeof(u64); 1863 1864 if (read_format & PERF_FORMAT_LOST) 1865 entry += sizeof(u64); 1866 1867 if (read_format & PERF_FORMAT_GROUP) { 1868 nr = evsel__group_read_nr_members(leader); 1869 size += sizeof(u64); 1870 } 1871 1872 size += entry * nr; 1873 return size; 1874 } 1875 1876 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) 1877 { 1878 u64 read_format = leader->core.attr.read_format; 1879 struct sample_read_value *v; 1880 u64 nr, ena = 0, run = 0, lost = 0; 1881 1882 nr = *data++; 1883 1884 if (nr != evsel__group_read_nr_members(leader)) 1885 return -EINVAL; 1886 1887 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1888 ena = *data++; 1889 1890 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1891 run = *data++; 1892 1893 v = (void *)data; 1894 sample_read_group__for_each(v, nr, read_format) { 1895 struct evsel *counter; 1896 1897 counter = evlist__id2evsel(leader->evlist, v->id); 1898 if (!counter) 1899 return -EINVAL; 1900 1901 if (read_format & PERF_FORMAT_LOST) 1902 lost = v->lost; 1903 1904 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); 1905 } 1906 1907 return 0; 1908 } 1909 1910 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread) 1911 { 1912 struct perf_stat_evsel *ps = leader->stats; 1913 u64 read_format = leader->core.attr.read_format; 1914 int size = evsel__group_read_size(leader); 1915 u64 *data = ps->group_data; 1916 1917 if (!(read_format & PERF_FORMAT_ID)) 1918 return -EINVAL; 1919 1920 if (!evsel__is_group_leader(leader)) 1921 return -EINVAL; 1922 1923 if (!data) { 1924 data = zalloc(size); 1925 if (!data) 1926 return -ENOMEM; 1927 1928 ps->group_data = data; 1929 } 1930 1931 if (FD(leader, cpu_map_idx, thread) < 0) 1932 return -EINVAL; 1933 1934 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) 1935 return -errno; 1936 1937 return evsel__process_group_data(leader, cpu_map_idx, thread, data); 1938 } 1939 1940 bool __evsel__match(const struct evsel *evsel, u32 type, u64 config) 1941 { 1942 1943 u32 e_type = evsel->core.attr.type; 1944 u64 e_config = evsel->core.attr.config; 1945 1946 if (e_type == type && e_config == config) 1947 return true; 1948 if (type != PERF_TYPE_HARDWARE && type != PERF_TYPE_HW_CACHE) 1949 return false; 1950 if ((e_type == PERF_TYPE_HARDWARE || e_type == PERF_TYPE_HW_CACHE) && 1951 perf_pmus__supports_extended_type()) 1952 e_config &= PERF_HW_EVENT_MASK; 1953 if (e_type == type && e_config == config) 1954 return true; 1955 if (type == PERF_TYPE_HARDWARE && evsel->pmu && evsel->pmu->is_core && 1956 evsel->alternate_hw_config == config) 1957 return true; 1958 return false; 1959 } 1960 1961 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) 1962 { 1963 if (evsel__is_tool(evsel)) 1964 return evsel__tool_pmu_read(evsel, cpu_map_idx, thread); 1965 1966 if (evsel__is_hwmon(evsel)) 1967 return evsel__hwmon_pmu_read(evsel, cpu_map_idx, thread); 1968 1969 if (evsel__is_drm(evsel)) 1970 return evsel__drm_pmu_read(evsel, cpu_map_idx, thread); 1971 1972 if (evsel__is_retire_lat(evsel)) 1973 return evsel__tpebs_read(evsel, cpu_map_idx, thread); 1974 1975 if (evsel->core.attr.read_format & PERF_FORMAT_GROUP) 1976 return evsel__read_group(evsel, cpu_map_idx, thread); 1977 1978 return evsel__read_one(evsel, cpu_map_idx, thread); 1979 } 1980 1981 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) 1982 { 1983 struct perf_counts_values count; 1984 size_t nv = scale ? 3 : 1; 1985 1986 if (FD(evsel, cpu_map_idx, thread) < 0) 1987 return -EINVAL; 1988 1989 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) 1990 return -ENOMEM; 1991 1992 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) 1993 return -errno; 1994 1995 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); 1996 perf_counts_values__scale(&count, scale, NULL); 1997 *perf_counts(evsel->counts, cpu_map_idx, thread) = count; 1998 return 0; 1999 } 2000 2001 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, 2002 int cpu_map_idx) 2003 { 2004 struct perf_cpu cpu; 2005 2006 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); 2007 return perf_cpu_map__idx(other->core.cpus, cpu); 2008 } 2009 2010 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) 2011 { 2012 struct evsel *leader = evsel__leader(evsel); 2013 2014 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || 2015 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { 2016 return evsel__match_other_cpu(evsel, leader, cpu_map_idx); 2017 } 2018 2019 return cpu_map_idx; 2020 } 2021 2022 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) 2023 { 2024 struct evsel *leader = evsel__leader(evsel); 2025 int fd; 2026 2027 if (!evsel->supported || evsel__is_group_leader(evsel)) 2028 return -1; 2029 2030 /* 2031 * Leader must be already processed/open, 2032 * if not it's a bug. 2033 */ 2034 BUG_ON(!leader->core.fd); 2035 2036 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); 2037 if (cpu_map_idx == -1) 2038 return -1; 2039 2040 fd = FD(leader, cpu_map_idx, thread); 2041 BUG_ON(fd == -1 && leader->supported); 2042 2043 /* 2044 * When the leader has been skipped, return -2 to distinguish from no 2045 * group leader case. 2046 */ 2047 return fd == -1 ? -2 : fd; 2048 } 2049 2050 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx) 2051 { 2052 for (int cpu = 0; cpu < nr_cpus; cpu++) 2053 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 2054 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 2055 } 2056 2057 static int update_fds(struct evsel *evsel, 2058 int nr_cpus, int cpu_map_idx, 2059 int nr_threads, int thread_idx) 2060 { 2061 struct evsel *pos; 2062 2063 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) 2064 return -EINVAL; 2065 2066 evlist__for_each_entry(evsel->evlist, pos) { 2067 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; 2068 2069 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 2070 2071 /* 2072 * Since fds for next evsel has not been created, 2073 * there is no need to iterate whole event list. 2074 */ 2075 if (pos == evsel) 2076 break; 2077 } 2078 return 0; 2079 } 2080 2081 static bool evsel__ignore_missing_thread(struct evsel *evsel, 2082 int nr_cpus, int cpu_map_idx, 2083 struct perf_thread_map *threads, 2084 int thread, int err) 2085 { 2086 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 2087 2088 if (!evsel->ignore_missing_thread) 2089 return false; 2090 2091 /* The system wide setup does not work with threads. */ 2092 if (evsel->core.system_wide) 2093 return false; 2094 2095 /* The -ESRCH is perf event syscall errno for pid's not found. */ 2096 if (err != -ESRCH) 2097 return false; 2098 2099 /* If there's only one thread, let it fail. */ 2100 if (threads->nr == 1) 2101 return false; 2102 2103 /* 2104 * We should remove fd for missing_thread first 2105 * because thread_map__remove() will decrease threads->nr. 2106 */ 2107 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread)) 2108 return false; 2109 2110 if (thread_map__remove(threads, thread)) 2111 return false; 2112 2113 pr_warning("WARNING: Ignored open failure for pid %d\n", 2114 ignore_pid); 2115 return true; 2116 } 2117 2118 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 2119 void *priv __maybe_unused) 2120 { 2121 return fprintf(fp, " %-32s %s\n", name, val); 2122 } 2123 2124 static void display_attr(struct perf_event_attr *attr) 2125 { 2126 if (verbose >= 2 || debug_peo_args) { 2127 fprintf(stderr, "%.60s\n", graph_dotted_line); 2128 fprintf(stderr, "perf_event_attr:\n"); 2129 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 2130 fprintf(stderr, "%.60s\n", graph_dotted_line); 2131 } 2132 } 2133 2134 bool evsel__precise_ip_fallback(struct evsel *evsel) 2135 { 2136 /* Do not try less precise if not requested. */ 2137 if (!evsel->precise_max) 2138 return false; 2139 2140 /* 2141 * We tried all the precise_ip values, and it's 2142 * still failing, so leave it to standard fallback. 2143 */ 2144 if (!evsel->core.attr.precise_ip) { 2145 evsel->core.attr.precise_ip = evsel->precise_ip_original; 2146 return false; 2147 } 2148 2149 if (!evsel->precise_ip_original) 2150 evsel->precise_ip_original = evsel->core.attr.precise_ip; 2151 2152 evsel->core.attr.precise_ip--; 2153 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 2154 display_attr(&evsel->core.attr); 2155 return true; 2156 } 2157 2158 static struct perf_cpu_map *empty_cpu_map; 2159 static struct perf_thread_map *empty_thread_map; 2160 2161 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 2162 struct perf_thread_map *threads) 2163 { 2164 int ret = 0; 2165 int nthreads = perf_thread_map__nr(threads); 2166 2167 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 2168 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 2169 return -EINVAL; 2170 2171 if (cpus == NULL) { 2172 if (empty_cpu_map == NULL) { 2173 empty_cpu_map = perf_cpu_map__new_any_cpu(); 2174 if (empty_cpu_map == NULL) 2175 return -ENOMEM; 2176 } 2177 2178 cpus = empty_cpu_map; 2179 } 2180 2181 if (threads == NULL) { 2182 if (empty_thread_map == NULL) { 2183 empty_thread_map = thread_map__new_by_tid(-1); 2184 if (empty_thread_map == NULL) 2185 return -ENOMEM; 2186 } 2187 2188 threads = empty_thread_map; 2189 } 2190 2191 if (evsel->core.fd == NULL && 2192 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) 2193 return -ENOMEM; 2194 2195 if (evsel__is_tool(evsel)) 2196 ret = evsel__tool_pmu_prepare_open(evsel, cpus, nthreads); 2197 2198 evsel->open_flags = PERF_FLAG_FD_CLOEXEC; 2199 if (evsel->cgrp) 2200 evsel->open_flags |= PERF_FLAG_PID_CGROUP; 2201 2202 return ret; 2203 } 2204 2205 static void evsel__disable_missing_features(struct evsel *evsel) 2206 { 2207 if (perf_missing_features.defer_callchain && evsel->core.attr.defer_callchain) 2208 evsel->core.attr.defer_callchain = 0; 2209 if (perf_missing_features.defer_callchain && evsel->core.attr.defer_output) 2210 evsel->core.attr.defer_output = 0; 2211 if (perf_missing_features.inherit_sample_read && evsel->core.attr.inherit && 2212 (evsel->core.attr.sample_type & PERF_SAMPLE_READ)) 2213 evsel->core.attr.inherit = 0; 2214 if (perf_missing_features.branch_counters) 2215 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS; 2216 if (perf_missing_features.read_lost) 2217 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST; 2218 if (perf_missing_features.weight_struct) { 2219 evsel__set_sample_bit(evsel, WEIGHT); 2220 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT); 2221 } 2222 if (perf_missing_features.clockid_wrong) 2223 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 2224 if (perf_missing_features.clockid) { 2225 evsel->core.attr.use_clockid = 0; 2226 evsel->core.attr.clockid = 0; 2227 } 2228 if (perf_missing_features.cloexec) 2229 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 2230 if (perf_missing_features.mmap2) 2231 evsel->core.attr.mmap2 = 0; 2232 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest) 2233 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 2234 if (perf_missing_features.lbr_flags) 2235 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 2236 PERF_SAMPLE_BRANCH_NO_CYCLES); 2237 if (perf_missing_features.group_read && evsel->core.attr.inherit) 2238 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 2239 if (perf_missing_features.ksymbol) 2240 evsel->core.attr.ksymbol = 0; 2241 if (perf_missing_features.bpf) 2242 evsel->core.attr.bpf_event = 0; 2243 if (perf_missing_features.branch_hw_idx) 2244 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX; 2245 if (perf_missing_features.sample_id_all) 2246 evsel->core.attr.sample_id_all = 0; 2247 } 2248 2249 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 2250 struct perf_thread_map *threads) 2251 { 2252 int err; 2253 2254 err = __evsel__prepare_open(evsel, cpus, threads); 2255 if (err) 2256 return err; 2257 2258 evsel__disable_missing_features(evsel); 2259 2260 return err; 2261 } 2262 2263 static bool __has_attr_feature(struct perf_event_attr *attr, 2264 struct perf_cpu cpu, unsigned long flags) 2265 { 2266 int fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2267 /*group_fd=*/-1, flags); 2268 close(fd); 2269 2270 if (fd < 0) { 2271 attr->exclude_kernel = 1; 2272 2273 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2274 /*group_fd=*/-1, flags); 2275 close(fd); 2276 } 2277 2278 if (fd < 0) { 2279 attr->exclude_hv = 1; 2280 2281 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2282 /*group_fd=*/-1, flags); 2283 close(fd); 2284 } 2285 2286 if (fd < 0) { 2287 attr->exclude_guest = 1; 2288 2289 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2290 /*group_fd=*/-1, flags); 2291 close(fd); 2292 } 2293 2294 attr->exclude_kernel = 0; 2295 attr->exclude_guest = 0; 2296 attr->exclude_hv = 0; 2297 2298 return fd >= 0; 2299 } 2300 2301 static bool has_attr_feature(struct perf_event_attr *attr, unsigned long flags) 2302 { 2303 struct perf_cpu cpu = {.cpu = -1}; 2304 2305 return __has_attr_feature(attr, cpu, flags); 2306 } 2307 2308 static void evsel__detect_missing_pmu_features(struct evsel *evsel) 2309 { 2310 struct perf_event_attr attr = { 2311 .type = evsel->core.attr.type, 2312 .config = evsel->core.attr.config, 2313 .disabled = 1, 2314 }; 2315 struct perf_pmu *pmu = evsel->pmu; 2316 int old_errno; 2317 2318 old_errno = errno; 2319 2320 if (pmu == NULL) 2321 pmu = evsel->pmu = evsel__find_pmu(evsel); 2322 2323 if (pmu == NULL || pmu->missing_features.checked) 2324 goto out; 2325 2326 /* 2327 * Must probe features in the order they were added to the 2328 * perf_event_attr interface. These are kernel core limitation but 2329 * specific to PMUs with branch stack. So we can detect with the given 2330 * hardware event and stop on the first one succeeded. 2331 */ 2332 2333 /* Please add new feature detection here. */ 2334 2335 attr.exclude_guest = 1; 2336 if (has_attr_feature(&attr, /*flags=*/0)) 2337 goto found; 2338 pmu->missing_features.exclude_guest = true; 2339 pr_debug2("switching off exclude_guest for PMU %s\n", pmu->name); 2340 2341 found: 2342 pmu->missing_features.checked = true; 2343 out: 2344 errno = old_errno; 2345 } 2346 2347 static void evsel__detect_missing_brstack_features(struct evsel *evsel) 2348 { 2349 static bool detection_done = false; 2350 struct perf_event_attr attr = { 2351 .type = evsel->core.attr.type, 2352 .config = evsel->core.attr.config, 2353 .disabled = 1, 2354 .sample_type = PERF_SAMPLE_BRANCH_STACK, 2355 .sample_period = 1000, 2356 }; 2357 int old_errno; 2358 2359 if (detection_done) 2360 return; 2361 2362 old_errno = errno; 2363 2364 /* 2365 * Must probe features in the order they were added to the 2366 * perf_event_attr interface. These are PMU specific limitation 2367 * so we can detect with the given hardware event and stop on the 2368 * first one succeeded. 2369 */ 2370 2371 /* Please add new feature detection here. */ 2372 2373 attr.branch_sample_type = PERF_SAMPLE_BRANCH_COUNTERS; 2374 if (has_attr_feature(&attr, /*flags=*/0)) 2375 goto found; 2376 perf_missing_features.branch_counters = true; 2377 pr_debug2("switching off branch counters support\n"); 2378 2379 attr.branch_sample_type = PERF_SAMPLE_BRANCH_HW_INDEX; 2380 if (has_attr_feature(&attr, /*flags=*/0)) 2381 goto found; 2382 perf_missing_features.branch_hw_idx = true; 2383 pr_debug2("switching off branch HW index support\n"); 2384 2385 attr.branch_sample_type = PERF_SAMPLE_BRANCH_NO_CYCLES | PERF_SAMPLE_BRANCH_NO_FLAGS; 2386 if (has_attr_feature(&attr, /*flags=*/0)) 2387 goto found; 2388 perf_missing_features.lbr_flags = true; 2389 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 2390 2391 found: 2392 detection_done = true; 2393 errno = old_errno; 2394 } 2395 2396 static bool evsel__probe_aux_action(struct evsel *evsel, struct perf_cpu cpu) 2397 { 2398 struct perf_event_attr attr = evsel->core.attr; 2399 int old_errno = errno; 2400 2401 attr.disabled = 1; 2402 attr.aux_start_paused = 1; 2403 2404 if (__has_attr_feature(&attr, cpu, /*flags=*/0)) { 2405 errno = old_errno; 2406 return true; 2407 } 2408 2409 /* 2410 * EOPNOTSUPP means the kernel supports the feature but the PMU does 2411 * not, so keep that distinction if possible. 2412 */ 2413 if (errno != EOPNOTSUPP) 2414 errno = old_errno; 2415 2416 return false; 2417 } 2418 2419 static void evsel__detect_missing_aux_action_feature(struct evsel *evsel, struct perf_cpu cpu) 2420 { 2421 static bool detection_done; 2422 struct evsel *leader; 2423 2424 /* 2425 * Don't bother probing aux_action if it is not being used or has been 2426 * probed before. 2427 */ 2428 if (!evsel->core.attr.aux_action || detection_done) 2429 return; 2430 2431 detection_done = true; 2432 2433 /* 2434 * The leader is an AUX area event. If it has failed, assume the feature 2435 * is not supported. 2436 */ 2437 leader = evsel__leader(evsel); 2438 if (evsel == leader) { 2439 perf_missing_features.aux_action = true; 2440 return; 2441 } 2442 2443 /* 2444 * AUX area event with aux_action must have been opened successfully 2445 * already, so feature is supported. 2446 */ 2447 if (leader->core.attr.aux_action) 2448 return; 2449 2450 if (!evsel__probe_aux_action(leader, cpu)) 2451 perf_missing_features.aux_action = true; 2452 } 2453 2454 static bool evsel__detect_missing_features(struct evsel *evsel, struct perf_cpu cpu) 2455 { 2456 static bool detection_done = false; 2457 struct perf_event_attr attr = { 2458 .type = PERF_TYPE_SOFTWARE, 2459 .config = PERF_COUNT_SW_TASK_CLOCK, 2460 .disabled = 1, 2461 }; 2462 int old_errno; 2463 2464 evsel__detect_missing_aux_action_feature(evsel, cpu); 2465 2466 evsel__detect_missing_pmu_features(evsel); 2467 2468 if (evsel__has_br_stack(evsel)) 2469 evsel__detect_missing_brstack_features(evsel); 2470 2471 if (detection_done) 2472 goto check; 2473 2474 old_errno = errno; 2475 2476 /* 2477 * Must probe features in the order they were added to the 2478 * perf_event_attr interface. These are kernel core limitation 2479 * not PMU-specific so we can detect with a software event and 2480 * stop on the first one succeeded. 2481 */ 2482 2483 /* Please add new feature detection here. */ 2484 2485 attr.defer_callchain = true; 2486 if (has_attr_feature(&attr, /*flags=*/0)) 2487 goto found; 2488 perf_missing_features.defer_callchain = true; 2489 pr_debug2("switching off deferred callchain support\n"); 2490 attr.defer_callchain = false; 2491 2492 attr.inherit = true; 2493 attr.sample_type = PERF_SAMPLE_READ | PERF_SAMPLE_TID; 2494 if (has_attr_feature(&attr, /*flags=*/0)) 2495 goto found; 2496 perf_missing_features.inherit_sample_read = true; 2497 pr_debug2("Using PERF_SAMPLE_READ / :S modifier is not compatible with inherit, falling back to no-inherit.\n"); 2498 attr.inherit = false; 2499 attr.sample_type = 0; 2500 2501 attr.read_format = PERF_FORMAT_LOST; 2502 if (has_attr_feature(&attr, /*flags=*/0)) 2503 goto found; 2504 perf_missing_features.read_lost = true; 2505 pr_debug2("switching off PERF_FORMAT_LOST support\n"); 2506 attr.read_format = 0; 2507 2508 attr.sample_type = PERF_SAMPLE_WEIGHT_STRUCT; 2509 if (has_attr_feature(&attr, /*flags=*/0)) 2510 goto found; 2511 perf_missing_features.weight_struct = true; 2512 pr_debug2("switching off weight struct support\n"); 2513 attr.sample_type = 0; 2514 2515 attr.sample_type = PERF_SAMPLE_CODE_PAGE_SIZE; 2516 if (has_attr_feature(&attr, /*flags=*/0)) 2517 goto found; 2518 perf_missing_features.code_page_size = true; 2519 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support\n"); 2520 attr.sample_type = 0; 2521 2522 attr.sample_type = PERF_SAMPLE_DATA_PAGE_SIZE; 2523 if (has_attr_feature(&attr, /*flags=*/0)) 2524 goto found; 2525 perf_missing_features.data_page_size = true; 2526 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support\n"); 2527 attr.sample_type = 0; 2528 2529 attr.cgroup = 1; 2530 if (has_attr_feature(&attr, /*flags=*/0)) 2531 goto found; 2532 perf_missing_features.cgroup = true; 2533 pr_debug2_peo("Kernel has no cgroup sampling support\n"); 2534 attr.cgroup = 0; 2535 2536 attr.aux_output = 1; 2537 if (has_attr_feature(&attr, /*flags=*/0)) 2538 goto found; 2539 perf_missing_features.aux_output = true; 2540 pr_debug2_peo("Kernel has no attr.aux_output support\n"); 2541 attr.aux_output = 0; 2542 2543 attr.bpf_event = 1; 2544 if (has_attr_feature(&attr, /*flags=*/0)) 2545 goto found; 2546 perf_missing_features.bpf = true; 2547 pr_debug2_peo("switching off bpf_event\n"); 2548 attr.bpf_event = 0; 2549 2550 attr.ksymbol = 1; 2551 if (has_attr_feature(&attr, /*flags=*/0)) 2552 goto found; 2553 perf_missing_features.ksymbol = true; 2554 pr_debug2_peo("switching off ksymbol\n"); 2555 attr.ksymbol = 0; 2556 2557 attr.write_backward = 1; 2558 if (has_attr_feature(&attr, /*flags=*/0)) 2559 goto found; 2560 perf_missing_features.write_backward = true; 2561 pr_debug2_peo("switching off write_backward\n"); 2562 attr.write_backward = 0; 2563 2564 attr.use_clockid = 1; 2565 attr.clockid = CLOCK_MONOTONIC; 2566 if (has_attr_feature(&attr, /*flags=*/0)) 2567 goto found; 2568 perf_missing_features.clockid = true; 2569 pr_debug2_peo("switching off clockid\n"); 2570 attr.use_clockid = 0; 2571 attr.clockid = 0; 2572 2573 if (has_attr_feature(&attr, /*flags=*/PERF_FLAG_FD_CLOEXEC)) 2574 goto found; 2575 perf_missing_features.cloexec = true; 2576 pr_debug2_peo("switching off cloexec flag\n"); 2577 2578 attr.mmap2 = 1; 2579 if (has_attr_feature(&attr, /*flags=*/0)) 2580 goto found; 2581 perf_missing_features.mmap2 = true; 2582 pr_debug2_peo("switching off mmap2\n"); 2583 attr.mmap2 = 0; 2584 2585 /* set this unconditionally? */ 2586 perf_missing_features.sample_id_all = true; 2587 pr_debug2_peo("switching off sample_id_all\n"); 2588 2589 attr.inherit = 1; 2590 attr.read_format = PERF_FORMAT_GROUP; 2591 if (has_attr_feature(&attr, /*flags=*/0)) 2592 goto found; 2593 perf_missing_features.group_read = true; 2594 pr_debug2_peo("switching off group read\n"); 2595 attr.inherit = 0; 2596 attr.read_format = 0; 2597 2598 found: 2599 detection_done = true; 2600 errno = old_errno; 2601 2602 check: 2603 if ((evsel->core.attr.defer_callchain || evsel->core.attr.defer_output) && 2604 perf_missing_features.defer_callchain) 2605 return true; 2606 2607 if (evsel->core.attr.inherit && 2608 (evsel->core.attr.sample_type & PERF_SAMPLE_READ) && 2609 perf_missing_features.inherit_sample_read) 2610 return true; 2611 2612 if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) && 2613 perf_missing_features.branch_counters) 2614 return true; 2615 2616 if ((evsel->core.attr.read_format & PERF_FORMAT_LOST) && 2617 perf_missing_features.read_lost) 2618 return true; 2619 2620 if ((evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT) && 2621 perf_missing_features.weight_struct) 2622 return true; 2623 2624 if (evsel->core.attr.use_clockid && evsel->core.attr.clockid != CLOCK_MONOTONIC && 2625 !perf_missing_features.clockid) { 2626 perf_missing_features.clockid_wrong = true; 2627 return true; 2628 } 2629 2630 if (evsel->core.attr.use_clockid && perf_missing_features.clockid) 2631 return true; 2632 2633 if ((evsel->open_flags & PERF_FLAG_FD_CLOEXEC) && 2634 perf_missing_features.cloexec) 2635 return true; 2636 2637 if (evsel->core.attr.mmap2 && perf_missing_features.mmap2) 2638 return true; 2639 2640 if ((evsel->core.attr.branch_sample_type & (PERF_SAMPLE_BRANCH_NO_FLAGS | 2641 PERF_SAMPLE_BRANCH_NO_CYCLES)) && 2642 perf_missing_features.lbr_flags) 2643 return true; 2644 2645 if (evsel->core.attr.inherit && (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 2646 perf_missing_features.group_read) 2647 return true; 2648 2649 if (evsel->core.attr.ksymbol && perf_missing_features.ksymbol) 2650 return true; 2651 2652 if (evsel->core.attr.bpf_event && perf_missing_features.bpf) 2653 return true; 2654 2655 if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX) && 2656 perf_missing_features.branch_hw_idx) 2657 return true; 2658 2659 if (evsel->core.attr.sample_id_all && perf_missing_features.sample_id_all) 2660 return true; 2661 2662 return false; 2663 } 2664 2665 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 2666 struct perf_thread_map *threads, 2667 int start_cpu_map_idx, int end_cpu_map_idx) 2668 { 2669 int idx, thread, nthreads; 2670 int pid = -1, err, old_errno; 2671 enum rlimit_action set_rlimit = NO_CHANGE; 2672 struct perf_cpu cpu; 2673 2674 if (evsel__is_retire_lat(evsel)) { 2675 err = evsel__tpebs_open(evsel); 2676 goto out; 2677 } 2678 2679 err = __evsel__prepare_open(evsel, cpus, threads); 2680 if (err) 2681 goto out; 2682 2683 if (cpus == NULL) 2684 cpus = empty_cpu_map; 2685 2686 if (threads == NULL) 2687 threads = empty_thread_map; 2688 2689 nthreads = perf_thread_map__nr(threads); 2690 2691 if (evsel->cgrp) 2692 pid = evsel->cgrp->fd; 2693 2694 fallback_missing_features: 2695 evsel__disable_missing_features(evsel); 2696 2697 pr_debug3("Opening: %s\n", evsel__name(evsel)); 2698 display_attr(&evsel->core.attr); 2699 2700 if (evsel__is_tool(evsel)) { 2701 err = evsel__tool_pmu_open(evsel, threads, 2702 start_cpu_map_idx, 2703 end_cpu_map_idx); 2704 goto out; 2705 } 2706 if (evsel__is_hwmon(evsel)) { 2707 err = evsel__hwmon_pmu_open(evsel, threads, 2708 start_cpu_map_idx, 2709 end_cpu_map_idx); 2710 goto out; 2711 } 2712 if (evsel__is_drm(evsel)) { 2713 err = evsel__drm_pmu_open(evsel, threads, 2714 start_cpu_map_idx, 2715 end_cpu_map_idx); 2716 goto out; 2717 } 2718 2719 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { 2720 cpu = perf_cpu_map__cpu(cpus, idx); 2721 2722 for (thread = 0; thread < nthreads; thread++) { 2723 int fd, group_fd; 2724 retry_open: 2725 if (thread >= nthreads) 2726 break; 2727 2728 if (!evsel->cgrp && !evsel->core.system_wide) 2729 pid = perf_thread_map__pid(threads, thread); 2730 2731 group_fd = get_group_fd(evsel, idx, thread); 2732 2733 if (group_fd == -2) { 2734 pr_debug("broken group leader for %s\n", evsel->name); 2735 err = -EINVAL; 2736 goto out_close; 2737 } 2738 2739 /* Debug message used by test scripts */ 2740 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 2741 pid, cpu.cpu, group_fd, evsel->open_flags); 2742 2743 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu.cpu, 2744 group_fd, evsel->open_flags); 2745 2746 FD(evsel, idx, thread) = fd; 2747 2748 if (fd < 0) { 2749 err = -errno; 2750 2751 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 2752 err); 2753 goto try_fallback; 2754 } 2755 2756 bpf_counter__install_pe(evsel, idx, fd); 2757 2758 if (unlikely(test_attr__enabled())) { 2759 test_attr__open(&evsel->core.attr, pid, cpu, 2760 fd, group_fd, evsel->open_flags); 2761 } 2762 2763 /* Debug message used by test scripts */ 2764 pr_debug2_peo(" = %d\n", fd); 2765 2766 if (evsel->bpf_fd >= 0) { 2767 int evt_fd = fd; 2768 int bpf_fd = evsel->bpf_fd; 2769 2770 err = ioctl(evt_fd, 2771 PERF_EVENT_IOC_SET_BPF, 2772 bpf_fd); 2773 if (err && errno != EEXIST) { 2774 pr_err("failed to attach bpf fd %d: %s\n", 2775 bpf_fd, strerror(errno)); 2776 err = -EINVAL; 2777 goto out_close; 2778 } 2779 } 2780 2781 set_rlimit = NO_CHANGE; 2782 2783 /* 2784 * If we succeeded but had to kill clockid, fail and 2785 * have evsel__open_strerror() print us a nice error. 2786 */ 2787 if (perf_missing_features.clockid || 2788 perf_missing_features.clockid_wrong) { 2789 err = -EINVAL; 2790 goto out_close; 2791 } 2792 } 2793 } 2794 2795 err = 0; 2796 goto out; 2797 2798 try_fallback: 2799 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), 2800 idx, threads, thread, err)) { 2801 /* We just removed 1 thread, so lower the upper nthreads limit. */ 2802 nthreads--; 2803 2804 /* ... and pretend like nothing have happened. */ 2805 err = 0; 2806 goto retry_open; 2807 } 2808 /* 2809 * perf stat needs between 5 and 22 fds per CPU. When we run out 2810 * of them try to increase the limits. 2811 */ 2812 if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit)) 2813 goto retry_open; 2814 2815 if (err == -EINVAL && evsel__detect_missing_features(evsel, cpu)) 2816 goto fallback_missing_features; 2817 2818 if (evsel__precise_ip_fallback(evsel)) 2819 goto retry_open; 2820 2821 out_close: 2822 if (err) 2823 threads->err_thread = thread; 2824 2825 old_errno = errno; 2826 do { 2827 while (--thread >= 0) { 2828 if (FD(evsel, idx, thread) >= 0) 2829 close(FD(evsel, idx, thread)); 2830 FD(evsel, idx, thread) = -1; 2831 } 2832 thread = nthreads; 2833 } while (--idx >= 0); 2834 errno = old_errno; 2835 out: 2836 if (err) 2837 evsel->supported = false; 2838 return err; 2839 } 2840 2841 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 2842 struct perf_thread_map *threads) 2843 { 2844 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2845 } 2846 2847 void evsel__close(struct evsel *evsel) 2848 { 2849 if (evsel__is_retire_lat(evsel)) 2850 evsel__tpebs_close(evsel); 2851 perf_evsel__close(&evsel->core); 2852 perf_evsel__free_id(&evsel->core); 2853 } 2854 2855 int evsel__open_per_cpu_and_thread(struct evsel *evsel, 2856 struct perf_cpu_map *cpus, int cpu_map_idx, 2857 struct perf_thread_map *threads) 2858 { 2859 if (cpu_map_idx == -1) 2860 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2861 2862 return evsel__open_cpu(evsel, cpus, threads, cpu_map_idx, cpu_map_idx + 1); 2863 } 2864 2865 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx) 2866 { 2867 struct perf_thread_map *threads = thread_map__new_by_tid(-1); 2868 int ret = evsel__open_per_cpu_and_thread(evsel, cpus, cpu_map_idx, threads); 2869 2870 perf_thread_map__put(threads); 2871 return ret; 2872 } 2873 2874 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 2875 { 2876 struct perf_cpu_map *cpus = perf_cpu_map__new_any_cpu(); 2877 int ret = evsel__open_per_cpu_and_thread(evsel, cpus, -1, threads); 2878 2879 perf_cpu_map__put(cpus); 2880 return ret; 2881 } 2882 2883 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 2884 const union perf_event *event, 2885 struct perf_sample *sample) 2886 { 2887 u64 type = evsel->core.attr.sample_type; 2888 const __u64 *array = event->sample.array; 2889 bool swapped = evsel->needs_swap; 2890 union u64_swap u; 2891 2892 array += ((event->header.size - 2893 sizeof(event->header)) / sizeof(u64)) - 1; 2894 2895 if (type & PERF_SAMPLE_IDENTIFIER) { 2896 sample->id = *array; 2897 array--; 2898 } 2899 2900 if (type & PERF_SAMPLE_CPU) { 2901 u.val64 = *array; 2902 if (swapped) { 2903 /* undo swap of u64, then swap on individual u32s */ 2904 u.val64 = bswap_64(u.val64); 2905 u.val32[0] = bswap_32(u.val32[0]); 2906 } 2907 2908 sample->cpu = u.val32[0]; 2909 array--; 2910 } 2911 2912 if (type & PERF_SAMPLE_STREAM_ID) { 2913 sample->stream_id = *array; 2914 array--; 2915 } 2916 2917 if (type & PERF_SAMPLE_ID) { 2918 sample->id = *array; 2919 array--; 2920 } 2921 2922 if (type & PERF_SAMPLE_TIME) { 2923 sample->time = *array; 2924 array--; 2925 } 2926 2927 if (type & PERF_SAMPLE_TID) { 2928 u.val64 = *array; 2929 if (swapped) { 2930 /* undo swap of u64, then swap on individual u32s */ 2931 u.val64 = bswap_64(u.val64); 2932 u.val32[0] = bswap_32(u.val32[0]); 2933 u.val32[1] = bswap_32(u.val32[1]); 2934 } 2935 2936 sample->pid = u.val32[0]; 2937 sample->tid = u.val32[1]; 2938 array--; 2939 } 2940 2941 return 0; 2942 } 2943 2944 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 2945 u64 size) 2946 { 2947 return size > max_size || offset + size > endp; 2948 } 2949 2950 #define OVERFLOW_CHECK(offset, size, max_size) \ 2951 do { \ 2952 if (overflow(endp, (max_size), (offset), (size))) \ 2953 return -EFAULT; \ 2954 } while (0) 2955 2956 #define OVERFLOW_CHECK_u64(offset) \ 2957 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 2958 2959 static int 2960 perf_event__check_size(union perf_event *event, unsigned int sample_size) 2961 { 2962 /* 2963 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 2964 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 2965 * check the format does not go past the end of the event. 2966 */ 2967 if (sample_size + sizeof(event->header) > event->header.size) 2968 return -EFAULT; 2969 2970 return 0; 2971 } 2972 2973 static void perf_parse_sample_weight(struct perf_sample *data, const __u64 *array, u64 type) 2974 { 2975 union perf_sample_weight weight; 2976 2977 weight.full = *array; 2978 if (type & PERF_SAMPLE_WEIGHT_STRUCT) { 2979 data->weight = weight.var1_dw; 2980 data->ins_lat = weight.var2_w; 2981 data->weight3 = weight.var3_w; 2982 } else { 2983 data->weight = weight.full; 2984 } 2985 } 2986 2987 u64 evsel__bitfield_swap_branch_flags(u64 value) 2988 { 2989 u64 new_val = 0; 2990 2991 /* 2992 * branch_flags 2993 * union { 2994 * u64 values; 2995 * struct { 2996 * mispred:1 //target mispredicted 2997 * predicted:1 //target predicted 2998 * in_tx:1 //in transaction 2999 * abort:1 //transaction abort 3000 * cycles:16 //cycle count to last branch 3001 * type:4 //branch type 3002 * spec:2 //branch speculation info 3003 * new_type:4 //additional branch type 3004 * priv:3 //privilege level 3005 * reserved:31 3006 * } 3007 * } 3008 * 3009 * Avoid bswap64() the entire branch_flag.value, 3010 * as it has variable bit-field sizes. Instead the 3011 * macro takes the bit-field position/size, 3012 * swaps it based on the host endianness. 3013 */ 3014 if (host_is_bigendian()) { 3015 new_val = bitfield_swap(value, 0, 1); 3016 new_val |= bitfield_swap(value, 1, 1); 3017 new_val |= bitfield_swap(value, 2, 1); 3018 new_val |= bitfield_swap(value, 3, 1); 3019 new_val |= bitfield_swap(value, 4, 16); 3020 new_val |= bitfield_swap(value, 20, 4); 3021 new_val |= bitfield_swap(value, 24, 2); 3022 new_val |= bitfield_swap(value, 26, 4); 3023 new_val |= bitfield_swap(value, 30, 3); 3024 new_val |= bitfield_swap(value, 33, 31); 3025 } else { 3026 new_val = bitfield_swap(value, 63, 1); 3027 new_val |= bitfield_swap(value, 62, 1); 3028 new_val |= bitfield_swap(value, 61, 1); 3029 new_val |= bitfield_swap(value, 60, 1); 3030 new_val |= bitfield_swap(value, 44, 16); 3031 new_val |= bitfield_swap(value, 40, 4); 3032 new_val |= bitfield_swap(value, 38, 2); 3033 new_val |= bitfield_swap(value, 34, 4); 3034 new_val |= bitfield_swap(value, 31, 3); 3035 new_val |= bitfield_swap(value, 0, 31); 3036 } 3037 3038 return new_val; 3039 } 3040 3041 static inline bool evsel__has_branch_counters(const struct evsel *evsel) 3042 { 3043 struct evsel *leader = evsel__leader(evsel); 3044 3045 /* The branch counters feature only supports group */ 3046 if (!leader || !evsel->evlist) 3047 return false; 3048 3049 if (evsel->evlist->nr_br_cntr < 0) 3050 evlist__update_br_cntr(evsel->evlist); 3051 3052 if (leader->br_cntr_nr > 0) 3053 return true; 3054 3055 return false; 3056 } 3057 3058 static int __set_offcpu_sample(struct perf_sample *data) 3059 { 3060 u64 *array = data->raw_data; 3061 u32 max_size = data->raw_size, *p32; 3062 const void *endp = (void *)array + max_size; 3063 3064 if (array == NULL) 3065 return -EFAULT; 3066 3067 OVERFLOW_CHECK_u64(array); 3068 p32 = (void *)array++; 3069 data->pid = p32[0]; 3070 data->tid = p32[1]; 3071 3072 OVERFLOW_CHECK_u64(array); 3073 data->period = *array++; 3074 3075 OVERFLOW_CHECK_u64(array); 3076 data->callchain = (struct ip_callchain *)array++; 3077 OVERFLOW_CHECK(array, data->callchain->nr * sizeof(u64), max_size); 3078 data->ip = data->callchain->ips[1]; 3079 array += data->callchain->nr; 3080 3081 OVERFLOW_CHECK_u64(array); 3082 data->cgroup = *array; 3083 3084 return 0; 3085 } 3086 3087 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 3088 struct perf_sample *data) 3089 { 3090 u64 type = evsel->core.attr.sample_type; 3091 bool swapped = evsel->needs_swap; 3092 const __u64 *array; 3093 u16 max_size = event->header.size; 3094 const void *endp = (void *)event + max_size; 3095 u64 sz; 3096 3097 /* 3098 * used for cross-endian analysis. See git commit 65014ab3 3099 * for why this goofiness is needed. 3100 */ 3101 union u64_swap u; 3102 3103 memset(data, 0, sizeof(*data)); 3104 data->cpu = data->pid = data->tid = -1; 3105 data->stream_id = data->id = data->time = -1ULL; 3106 data->period = evsel->core.attr.sample_period; 3107 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 3108 data->misc = event->header.misc; 3109 data->data_src = PERF_MEM_DATA_SRC_NONE; 3110 data->vcpu = -1; 3111 3112 if (event->header.type == PERF_RECORD_CALLCHAIN_DEFERRED) { 3113 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 3114 3115 data->callchain = (struct ip_callchain *)&event->callchain_deferred.nr; 3116 if (data->callchain->nr > max_callchain_nr) 3117 return -EFAULT; 3118 3119 data->deferred_cookie = event->callchain_deferred.cookie; 3120 3121 if (evsel->core.attr.sample_id_all) 3122 perf_evsel__parse_id_sample(evsel, event, data); 3123 return 0; 3124 } 3125 3126 if (event->header.type != PERF_RECORD_SAMPLE) { 3127 if (!evsel->core.attr.sample_id_all) 3128 return 0; 3129 return perf_evsel__parse_id_sample(evsel, event, data); 3130 } 3131 3132 array = event->sample.array; 3133 3134 if (perf_event__check_size(event, evsel->sample_size)) 3135 return -EFAULT; 3136 3137 if (type & PERF_SAMPLE_IDENTIFIER) { 3138 data->id = *array; 3139 array++; 3140 } 3141 3142 if (type & PERF_SAMPLE_IP) { 3143 data->ip = *array; 3144 array++; 3145 } 3146 3147 if (type & PERF_SAMPLE_TID) { 3148 u.val64 = *array; 3149 if (swapped) { 3150 /* undo swap of u64, then swap on individual u32s */ 3151 u.val64 = bswap_64(u.val64); 3152 u.val32[0] = bswap_32(u.val32[0]); 3153 u.val32[1] = bswap_32(u.val32[1]); 3154 } 3155 3156 data->pid = u.val32[0]; 3157 data->tid = u.val32[1]; 3158 array++; 3159 } 3160 3161 if (type & PERF_SAMPLE_TIME) { 3162 data->time = *array; 3163 array++; 3164 } 3165 3166 if (type & PERF_SAMPLE_ADDR) { 3167 data->addr = *array; 3168 array++; 3169 } 3170 3171 if (type & PERF_SAMPLE_ID) { 3172 data->id = *array; 3173 array++; 3174 } 3175 3176 if (type & PERF_SAMPLE_STREAM_ID) { 3177 data->stream_id = *array; 3178 array++; 3179 } 3180 3181 if (type & PERF_SAMPLE_CPU) { 3182 3183 u.val64 = *array; 3184 if (swapped) { 3185 /* undo swap of u64, then swap on individual u32s */ 3186 u.val64 = bswap_64(u.val64); 3187 u.val32[0] = bswap_32(u.val32[0]); 3188 } 3189 3190 data->cpu = u.val32[0]; 3191 array++; 3192 } 3193 3194 if (type & PERF_SAMPLE_PERIOD) { 3195 data->period = *array; 3196 array++; 3197 } 3198 3199 if (type & PERF_SAMPLE_READ) { 3200 u64 read_format = evsel->core.attr.read_format; 3201 3202 OVERFLOW_CHECK_u64(array); 3203 if (read_format & PERF_FORMAT_GROUP) 3204 data->read.group.nr = *array; 3205 else 3206 data->read.one.value = *array; 3207 3208 array++; 3209 3210 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 3211 OVERFLOW_CHECK_u64(array); 3212 data->read.time_enabled = *array; 3213 array++; 3214 } 3215 3216 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 3217 OVERFLOW_CHECK_u64(array); 3218 data->read.time_running = *array; 3219 array++; 3220 } 3221 3222 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 3223 if (read_format & PERF_FORMAT_GROUP) { 3224 const u64 max_group_nr = UINT64_MAX / 3225 sizeof(struct sample_read_value); 3226 3227 if (data->read.group.nr > max_group_nr) 3228 return -EFAULT; 3229 3230 sz = data->read.group.nr * sample_read_value_size(read_format); 3231 OVERFLOW_CHECK(array, sz, max_size); 3232 data->read.group.values = 3233 (struct sample_read_value *)array; 3234 array = (void *)array + sz; 3235 } else { 3236 OVERFLOW_CHECK_u64(array); 3237 data->read.one.id = *array; 3238 array++; 3239 3240 if (read_format & PERF_FORMAT_LOST) { 3241 OVERFLOW_CHECK_u64(array); 3242 data->read.one.lost = *array; 3243 array++; 3244 } 3245 } 3246 } 3247 3248 if (type & PERF_SAMPLE_CALLCHAIN) { 3249 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 3250 u64 callchain_nr; 3251 3252 OVERFLOW_CHECK_u64(array); 3253 data->callchain = (struct ip_callchain *)array++; 3254 callchain_nr = data->callchain->nr; 3255 if (callchain_nr > max_callchain_nr) 3256 return -EFAULT; 3257 sz = callchain_nr * sizeof(u64); 3258 /* 3259 * Save the cookie for the deferred user callchain. The last 2 3260 * entries in the callchain should be the context marker and the 3261 * cookie. The cookie will be used to match PERF_RECORD_ 3262 * CALLCHAIN_DEFERRED later. 3263 */ 3264 if (evsel->core.attr.defer_callchain && callchain_nr >= 2 && 3265 data->callchain->ips[callchain_nr - 2] == PERF_CONTEXT_USER_DEFERRED) { 3266 data->deferred_cookie = data->callchain->ips[callchain_nr - 1]; 3267 data->deferred_callchain = true; 3268 } 3269 OVERFLOW_CHECK(array, sz, max_size); 3270 array = (void *)array + sz; 3271 } 3272 3273 if (type & PERF_SAMPLE_RAW) { 3274 OVERFLOW_CHECK_u64(array); 3275 u.val64 = *array; 3276 3277 /* 3278 * Undo swap of u64, then swap on individual u32s, 3279 * get the size of the raw area and undo all of the 3280 * swap. The pevent interface handles endianness by 3281 * itself. 3282 */ 3283 if (swapped) { 3284 u.val64 = bswap_64(u.val64); 3285 u.val32[0] = bswap_32(u.val32[0]); 3286 u.val32[1] = bswap_32(u.val32[1]); 3287 } 3288 data->raw_size = u.val32[0]; 3289 3290 /* 3291 * The raw data is aligned on 64bits including the 3292 * u32 size, so it's safe to use mem_bswap_64. 3293 */ 3294 if (swapped) 3295 mem_bswap_64((void *) array, data->raw_size); 3296 3297 array = (void *)array + sizeof(u32); 3298 3299 OVERFLOW_CHECK(array, data->raw_size, max_size); 3300 data->raw_data = (void *)array; 3301 array = (void *)array + data->raw_size; 3302 } 3303 3304 if (type & PERF_SAMPLE_BRANCH_STACK) { 3305 const u64 max_branch_nr = UINT64_MAX / 3306 sizeof(struct branch_entry); 3307 struct branch_entry *e; 3308 unsigned int i; 3309 3310 OVERFLOW_CHECK_u64(array); 3311 data->branch_stack = (struct branch_stack *)array++; 3312 3313 if (data->branch_stack->nr > max_branch_nr) 3314 return -EFAULT; 3315 3316 sz = data->branch_stack->nr * sizeof(struct branch_entry); 3317 if (evsel__has_branch_hw_idx(evsel)) { 3318 sz += sizeof(u64); 3319 e = &data->branch_stack->entries[0]; 3320 } else { 3321 data->no_hw_idx = true; 3322 /* 3323 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, 3324 * only nr and entries[] will be output by kernel. 3325 */ 3326 e = (struct branch_entry *)&data->branch_stack->hw_idx; 3327 } 3328 3329 if (swapped) { 3330 /* 3331 * struct branch_flag does not have endian 3332 * specific bit field definition. And bswap 3333 * will not resolve the issue, since these 3334 * are bit fields. 3335 * 3336 * evsel__bitfield_swap_branch_flags() uses a 3337 * bitfield_swap macro to swap the bit position 3338 * based on the host endians. 3339 */ 3340 for (i = 0; i < data->branch_stack->nr; i++, e++) 3341 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); 3342 } 3343 3344 OVERFLOW_CHECK(array, sz, max_size); 3345 array = (void *)array + sz; 3346 3347 if (evsel__has_branch_counters(evsel)) { 3348 data->branch_stack_cntr = (u64 *)array; 3349 sz = data->branch_stack->nr * sizeof(u64); 3350 3351 OVERFLOW_CHECK(array, sz, max_size); 3352 array = (void *)array + sz; 3353 } 3354 } 3355 3356 if (type & PERF_SAMPLE_REGS_USER) { 3357 struct regs_dump *regs = perf_sample__user_regs(data); 3358 3359 OVERFLOW_CHECK_u64(array); 3360 regs->abi = *array; 3361 array++; 3362 3363 if (regs->abi) { 3364 u64 mask = evsel->core.attr.sample_regs_user; 3365 3366 sz = hweight64(mask) * sizeof(u64); 3367 OVERFLOW_CHECK(array, sz, max_size); 3368 regs->mask = mask; 3369 regs->regs = (u64 *)array; 3370 array = (void *)array + sz; 3371 } 3372 } 3373 3374 if (type & PERF_SAMPLE_STACK_USER) { 3375 OVERFLOW_CHECK_u64(array); 3376 sz = *array++; 3377 3378 data->user_stack.offset = ((char *)(array - 1) 3379 - (char *) event); 3380 3381 if (!sz) { 3382 data->user_stack.size = 0; 3383 } else { 3384 OVERFLOW_CHECK(array, sz, max_size); 3385 data->user_stack.data = (char *)array; 3386 array = (void *)array + sz; 3387 OVERFLOW_CHECK_u64(array); 3388 data->user_stack.size = *array++; 3389 if (WARN_ONCE(data->user_stack.size > sz, 3390 "user stack dump failure\n")) 3391 return -EFAULT; 3392 } 3393 } 3394 3395 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 3396 OVERFLOW_CHECK_u64(array); 3397 perf_parse_sample_weight(data, array, type); 3398 array++; 3399 } 3400 3401 if (type & PERF_SAMPLE_DATA_SRC) { 3402 OVERFLOW_CHECK_u64(array); 3403 data->data_src = *array; 3404 array++; 3405 } 3406 3407 if (type & PERF_SAMPLE_TRANSACTION) { 3408 OVERFLOW_CHECK_u64(array); 3409 data->transaction = *array; 3410 array++; 3411 } 3412 3413 if (type & PERF_SAMPLE_REGS_INTR) { 3414 struct regs_dump *regs = perf_sample__intr_regs(data); 3415 3416 OVERFLOW_CHECK_u64(array); 3417 regs->abi = *array; 3418 array++; 3419 3420 if (regs->abi != PERF_SAMPLE_REGS_ABI_NONE) { 3421 u64 mask = evsel->core.attr.sample_regs_intr; 3422 3423 sz = hweight64(mask) * sizeof(u64); 3424 OVERFLOW_CHECK(array, sz, max_size); 3425 regs->mask = mask; 3426 regs->regs = (u64 *)array; 3427 array = (void *)array + sz; 3428 } 3429 } 3430 3431 data->phys_addr = 0; 3432 if (type & PERF_SAMPLE_PHYS_ADDR) { 3433 data->phys_addr = *array; 3434 array++; 3435 } 3436 3437 data->cgroup = 0; 3438 if (type & PERF_SAMPLE_CGROUP) { 3439 data->cgroup = *array; 3440 array++; 3441 } 3442 3443 data->data_page_size = 0; 3444 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 3445 data->data_page_size = *array; 3446 array++; 3447 } 3448 3449 data->code_page_size = 0; 3450 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 3451 data->code_page_size = *array; 3452 array++; 3453 } 3454 3455 if (type & PERF_SAMPLE_AUX) { 3456 OVERFLOW_CHECK_u64(array); 3457 sz = *array++; 3458 3459 OVERFLOW_CHECK(array, sz, max_size); 3460 /* Undo swap of data */ 3461 if (swapped) 3462 mem_bswap_64((char *)array, sz); 3463 data->aux_sample.size = sz; 3464 data->aux_sample.data = (char *)array; 3465 array = (void *)array + sz; 3466 } 3467 3468 if (evsel__is_offcpu_event(evsel)) 3469 return __set_offcpu_sample(data); 3470 3471 return 0; 3472 } 3473 3474 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 3475 u64 *timestamp) 3476 { 3477 u64 type = evsel->core.attr.sample_type; 3478 const __u64 *array; 3479 3480 if (!(type & PERF_SAMPLE_TIME)) 3481 return -1; 3482 3483 if (event->header.type != PERF_RECORD_SAMPLE) { 3484 struct perf_sample data = { 3485 .time = -1ULL, 3486 }; 3487 3488 if (!evsel->core.attr.sample_id_all) 3489 return -1; 3490 if (perf_evsel__parse_id_sample(evsel, event, &data)) 3491 return -1; 3492 3493 *timestamp = data.time; 3494 return 0; 3495 } 3496 3497 array = event->sample.array; 3498 3499 if (perf_event__check_size(event, evsel->sample_size)) 3500 return -EFAULT; 3501 3502 if (type & PERF_SAMPLE_IDENTIFIER) 3503 array++; 3504 3505 if (type & PERF_SAMPLE_IP) 3506 array++; 3507 3508 if (type & PERF_SAMPLE_TID) 3509 array++; 3510 3511 if (type & PERF_SAMPLE_TIME) 3512 *timestamp = *array; 3513 3514 return 0; 3515 } 3516 3517 u16 evsel__id_hdr_size(const struct evsel *evsel) 3518 { 3519 u64 sample_type = evsel->core.attr.sample_type; 3520 u16 size = 0; 3521 3522 if (sample_type & PERF_SAMPLE_TID) 3523 size += sizeof(u64); 3524 3525 if (sample_type & PERF_SAMPLE_TIME) 3526 size += sizeof(u64); 3527 3528 if (sample_type & PERF_SAMPLE_ID) 3529 size += sizeof(u64); 3530 3531 if (sample_type & PERF_SAMPLE_STREAM_ID) 3532 size += sizeof(u64); 3533 3534 if (sample_type & PERF_SAMPLE_CPU) 3535 size += sizeof(u64); 3536 3537 if (sample_type & PERF_SAMPLE_IDENTIFIER) 3538 size += sizeof(u64); 3539 3540 return size; 3541 } 3542 3543 #ifdef HAVE_LIBTRACEEVENT 3544 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 3545 { 3546 struct tep_event *tp_format = evsel__tp_format(evsel); 3547 3548 return tp_format ? tep_find_field(tp_format, name) : NULL; 3549 } 3550 3551 struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name) 3552 { 3553 struct tep_event *tp_format = evsel__tp_format(evsel); 3554 3555 return tp_format ? tep_find_common_field(tp_format, name) : NULL; 3556 } 3557 3558 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 3559 { 3560 struct tep_format_field *field = evsel__field(evsel, name); 3561 int offset; 3562 3563 if (!field) 3564 return NULL; 3565 3566 offset = field->offset; 3567 3568 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 3569 offset = *(int *)(sample->raw_data + field->offset); 3570 offset &= 0xffff; 3571 if (tep_field_is_relative(field->flags)) 3572 offset += field->offset + field->size; 3573 } 3574 3575 return sample->raw_data + offset; 3576 } 3577 3578 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 3579 bool needs_swap) 3580 { 3581 u64 value; 3582 void *ptr = sample->raw_data + field->offset; 3583 3584 switch (field->size) { 3585 case 1: 3586 return *(u8 *)ptr; 3587 case 2: 3588 value = *(u16 *)ptr; 3589 break; 3590 case 4: 3591 value = *(u32 *)ptr; 3592 break; 3593 case 8: 3594 memcpy(&value, ptr, sizeof(u64)); 3595 break; 3596 default: 3597 return 0; 3598 } 3599 3600 if (!needs_swap) 3601 return value; 3602 3603 switch (field->size) { 3604 case 2: 3605 return bswap_16(value); 3606 case 4: 3607 return bswap_32(value); 3608 case 8: 3609 return bswap_64(value); 3610 default: 3611 return 0; 3612 } 3613 3614 return 0; 3615 } 3616 3617 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 3618 { 3619 struct tep_format_field *field = evsel__field(evsel, name); 3620 3621 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 3622 } 3623 3624 u64 evsel__intval_common(struct evsel *evsel, struct perf_sample *sample, const char *name) 3625 { 3626 struct tep_format_field *field = evsel__common_field(evsel, name); 3627 3628 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 3629 } 3630 3631 char evsel__taskstate(struct evsel *evsel, struct perf_sample *sample, const char *name) 3632 { 3633 static struct tep_format_field *prev_state_field; 3634 static const char *states; 3635 struct tep_format_field *field; 3636 unsigned long long val; 3637 unsigned int bit; 3638 char state = '?'; /* '?' denotes unknown task state */ 3639 3640 field = evsel__field(evsel, name); 3641 3642 if (!field) 3643 return state; 3644 3645 if (!states || field != prev_state_field) { 3646 states = parse_task_states(field); 3647 if (!states) 3648 return state; 3649 prev_state_field = field; 3650 } 3651 3652 /* 3653 * Note since the kernel exposes TASK_REPORT_MAX to userspace 3654 * to denote the 'preempted' state, we might as welll report 3655 * 'R' for this case, which make senses to users as well. 3656 * 3657 * We can change this if we have a good reason in the future. 3658 */ 3659 val = evsel__intval(evsel, sample, name); 3660 bit = val ? ffs(val) : 0; 3661 state = (!bit || bit > strlen(states)) ? 'R' : states[bit-1]; 3662 return state; 3663 } 3664 #endif 3665 3666 bool evsel__fallback(struct evsel *evsel, struct target *target, int err, 3667 char *msg, size_t msgsize) 3668 { 3669 int paranoid; 3670 3671 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 3672 evsel->core.attr.type == PERF_TYPE_HARDWARE && 3673 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 3674 /* 3675 * If it's cycles then fall back to hrtimer based cpu-clock sw 3676 * counter, which is always available even if no PMU support. 3677 * 3678 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 3679 * b0a873e). 3680 */ 3681 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 3682 evsel->core.attr.config = target__has_cpu(target) 3683 ? PERF_COUNT_SW_CPU_CLOCK 3684 : PERF_COUNT_SW_TASK_CLOCK; 3685 scnprintf(msg, msgsize, 3686 "The cycles event is not supported, trying to fall back to %s", 3687 target__has_cpu(target) ? "cpu-clock" : "task-clock"); 3688 3689 zfree(&evsel->name); 3690 return true; 3691 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 3692 (paranoid = perf_event_paranoid()) > 1) { 3693 const char *name = evsel__name(evsel); 3694 char *new_name; 3695 const char *sep = ":"; 3696 3697 /* If event has exclude user then don't exclude kernel. */ 3698 if (evsel->core.attr.exclude_user) 3699 goto no_fallback; 3700 3701 /* Is there already the separator in the name. */ 3702 if (strchr(name, '/') || 3703 (strchr(name, ':') && !evsel->is_libpfm_event)) 3704 sep = ""; 3705 3706 if (asprintf(&new_name, "%s%su", name, sep) < 0) 3707 goto no_fallback; 3708 3709 free(evsel->name); 3710 evsel->name = new_name; 3711 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 3712 "to fall back to excluding kernel and hypervisor " 3713 " samples", paranoid); 3714 evsel->core.attr.exclude_kernel = 1; 3715 evsel->core.attr.exclude_hv = 1; 3716 3717 return true; 3718 } else if (err == EOPNOTSUPP && !evsel->core.attr.exclude_guest && 3719 !evsel->exclude_GH) { 3720 const char *name = evsel__name(evsel); 3721 char *new_name; 3722 const char *sep = ":"; 3723 3724 /* Is there already the separator in the name. */ 3725 if (strchr(name, '/') || 3726 (strchr(name, ':') && !evsel->is_libpfm_event)) 3727 sep = ""; 3728 3729 if (asprintf(&new_name, "%s%sH", name, sep) < 0) 3730 goto no_fallback; 3731 3732 free(evsel->name); 3733 evsel->name = new_name; 3734 /* Apple M1 requires exclude_guest */ 3735 scnprintf(msg, msgsize, "Trying to fall back to excluding guest samples"); 3736 evsel->core.attr.exclude_guest = 1; 3737 3738 return true; 3739 } 3740 no_fallback: 3741 scnprintf(msg, msgsize, "No fallback found for '%s' for error %d", 3742 evsel__name(evsel), err); 3743 return false; 3744 } 3745 3746 static bool find_process(const char *name) 3747 { 3748 size_t len = strlen(name); 3749 DIR *dir; 3750 struct dirent *d; 3751 int ret = -1; 3752 3753 dir = opendir(procfs__mountpoint()); 3754 if (!dir) 3755 return false; 3756 3757 /* Walk through the directory. */ 3758 while (ret && (d = readdir(dir)) != NULL) { 3759 char path[PATH_MAX]; 3760 char *data; 3761 size_t size; 3762 3763 if ((d->d_type != DT_DIR) || 3764 !strcmp(".", d->d_name) || 3765 !strcmp("..", d->d_name)) 3766 continue; 3767 3768 scnprintf(path, sizeof(path), "%s/%s/comm", 3769 procfs__mountpoint(), d->d_name); 3770 3771 if (filename__read_str(path, &data, &size)) 3772 continue; 3773 3774 ret = strncmp(name, data, len); 3775 free(data); 3776 } 3777 3778 closedir(dir); 3779 return ret ? false : true; 3780 } 3781 3782 static int dump_perf_event_processes(char *msg, size_t size) 3783 { 3784 DIR *proc_dir; 3785 struct dirent *proc_entry; 3786 int printed = 0; 3787 3788 proc_dir = opendir(procfs__mountpoint()); 3789 if (!proc_dir) 3790 return 0; 3791 3792 /* Walk through the /proc directory. */ 3793 while ((proc_entry = readdir(proc_dir)) != NULL) { 3794 char buf[256]; 3795 DIR *fd_dir; 3796 struct dirent *fd_entry; 3797 int fd_dir_fd; 3798 3799 if (proc_entry->d_type != DT_DIR || 3800 !isdigit(proc_entry->d_name[0]) || 3801 strlen(proc_entry->d_name) > sizeof(buf) - 4) 3802 continue; 3803 3804 scnprintf(buf, sizeof(buf), "%s/fd", proc_entry->d_name); 3805 fd_dir_fd = openat(dirfd(proc_dir), buf, O_DIRECTORY); 3806 if (fd_dir_fd == -1) 3807 continue; 3808 fd_dir = fdopendir(fd_dir_fd); 3809 if (!fd_dir) { 3810 close(fd_dir_fd); 3811 continue; 3812 } 3813 while ((fd_entry = readdir(fd_dir)) != NULL) { 3814 ssize_t link_size; 3815 3816 if (fd_entry->d_type != DT_LNK) 3817 continue; 3818 link_size = readlinkat(fd_dir_fd, fd_entry->d_name, buf, sizeof(buf)); 3819 if (link_size < 0) 3820 continue; 3821 /* Take care as readlink doesn't null terminate the string. */ 3822 if (!strncmp(buf, "anon_inode:[perf_event]", link_size)) { 3823 int cmdline_fd; 3824 ssize_t cmdline_size; 3825 3826 scnprintf(buf, sizeof(buf), "%s/cmdline", proc_entry->d_name); 3827 cmdline_fd = openat(dirfd(proc_dir), buf, O_RDONLY); 3828 if (cmdline_fd == -1) 3829 continue; 3830 cmdline_size = read(cmdline_fd, buf, sizeof(buf) - 1); 3831 close(cmdline_fd); 3832 if (cmdline_size < 0) 3833 continue; 3834 buf[cmdline_size] = '\0'; 3835 for (ssize_t i = 0; i < cmdline_size; i++) { 3836 if (buf[i] == '\0') 3837 buf[i] = ' '; 3838 } 3839 3840 if (printed == 0) 3841 printed += scnprintf(msg, size, "Possible processes:\n"); 3842 3843 printed += scnprintf(msg + printed, size - printed, 3844 "%s %s\n", proc_entry->d_name, buf); 3845 break; 3846 } 3847 } 3848 closedir(fd_dir); 3849 } 3850 closedir(proc_dir); 3851 return printed; 3852 } 3853 3854 int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused, 3855 int err __maybe_unused, 3856 char *msg __maybe_unused, 3857 size_t size __maybe_unused) 3858 { 3859 return 0; 3860 } 3861 3862 int evsel__open_strerror(struct evsel *evsel, struct target *target, 3863 int err, char *msg, size_t size) 3864 { 3865 struct perf_pmu *pmu; 3866 char sbuf[STRERR_BUFSIZE]; 3867 int printed = 0, enforced = 0; 3868 int ret; 3869 3870 switch (err) { 3871 case EPERM: 3872 case EACCES: 3873 printed += scnprintf(msg + printed, size - printed, 3874 "Access to performance monitoring and observability operations is limited.\n"); 3875 3876 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 3877 if (enforced) { 3878 printed += scnprintf(msg + printed, size - printed, 3879 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 3880 "monitoring and observability operations. Inspect system audit records for\n" 3881 "more perf_event access control information and adjusting the policy.\n"); 3882 } 3883 } 3884 3885 if (err == EPERM) 3886 printed += scnprintf(msg, size, 3887 "No permission to enable %s event.\n\n", evsel__name(evsel)); 3888 3889 return printed + scnprintf(msg + printed, size - printed, 3890 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 3891 "access to performance monitoring and observability operations for processes\n" 3892 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 3893 "More information can be found at 'Perf events and tool security' document:\n" 3894 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 3895 "perf_event_paranoid setting is %d:\n" 3896 " -1: Allow use of (almost) all events by all users\n" 3897 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 3898 ">= 0: Disallow raw and ftrace function tracepoint access\n" 3899 ">= 1: Disallow CPU event access\n" 3900 ">= 2: Disallow kernel profiling\n" 3901 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 3902 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 3903 perf_event_paranoid()); 3904 case ENOENT: 3905 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 3906 case EMFILE: 3907 return scnprintf(msg, size, "%s", 3908 "Too many events are opened.\n" 3909 "Probably the maximum number of open file descriptors has been reached.\n" 3910 "Hint: Try again after reducing the number of events.\n" 3911 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 3912 case ENOMEM: 3913 if (evsel__has_callchain(evsel) && 3914 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 3915 return scnprintf(msg, size, 3916 "Not enough memory to setup event with callchain.\n" 3917 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 3918 "Hint: Current value: %d", sysctl__max_stack()); 3919 break; 3920 case ENODEV: 3921 if (target->cpu_list) 3922 return scnprintf(msg, size, "%s", 3923 "No such device - did you specify an out-of-range profile CPU?"); 3924 break; 3925 case EOPNOTSUPP: 3926 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) 3927 return scnprintf(msg, size, 3928 "%s: PMU Hardware or event type doesn't support branch stack sampling.", 3929 evsel__name(evsel)); 3930 if (evsel->core.attr.aux_output) 3931 return scnprintf(msg, size, 3932 "%s: PMU Hardware doesn't support 'aux_output' feature", 3933 evsel__name(evsel)); 3934 if (evsel->core.attr.aux_action) 3935 return scnprintf(msg, size, 3936 "%s: PMU Hardware doesn't support 'aux_action' feature", 3937 evsel__name(evsel)); 3938 if (evsel->core.attr.sample_period != 0) 3939 return scnprintf(msg, size, 3940 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 3941 evsel__name(evsel)); 3942 if (evsel->core.attr.precise_ip) 3943 return scnprintf(msg, size, "%s", 3944 "\'precise\' request may not be supported. Try removing 'p' modifier."); 3945 #if defined(__i386__) || defined(__x86_64__) 3946 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 3947 return scnprintf(msg, size, "%s", 3948 "No hardware sampling interrupt available.\n"); 3949 #endif 3950 if (!target__has_cpu(target)) 3951 return scnprintf(msg, size, 3952 "Unsupported event (%s) in per-thread mode, enable system wide with '-a'.", 3953 evsel__name(evsel)); 3954 break; 3955 case EBUSY: 3956 if (find_process("oprofiled")) 3957 return scnprintf(msg, size, 3958 "The PMU counters are busy/taken by another profiler.\n" 3959 "We found oprofile daemon running, please stop it and try again."); 3960 printed += scnprintf( 3961 msg, size, 3962 "The PMU %s counters are busy and in use by another process.\n", 3963 evsel->pmu ? evsel->pmu->name : ""); 3964 return printed + dump_perf_event_processes(msg + printed, size - printed); 3965 break; 3966 case EINVAL: 3967 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) 3968 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); 3969 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) 3970 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); 3971 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 3972 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 3973 if (perf_missing_features.clockid) 3974 return scnprintf(msg, size, "clockid feature not supported."); 3975 if (perf_missing_features.clockid_wrong) 3976 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 3977 if (perf_missing_features.aux_action) 3978 return scnprintf(msg, size, "The 'aux_action' feature is not supported, update the kernel."); 3979 if (perf_missing_features.aux_output) 3980 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 3981 pmu = evsel__find_pmu(evsel); 3982 if (!pmu->is_core && !target__has_cpu(target)) 3983 return scnprintf(msg, size, 3984 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", 3985 evsel__name(evsel)); 3986 3987 break; 3988 case ENODATA: 3989 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " 3990 "Please add an auxiliary event in front of the load latency event."); 3991 default: 3992 break; 3993 } 3994 3995 ret = arch_evsel__open_strerror(evsel, err, msg, size); 3996 if (ret) 3997 return ret; 3998 3999 return scnprintf(msg, size, 4000 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 4001 "\"dmesg | grep -i perf\" may provide additional information.\n", 4002 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel)); 4003 } 4004 4005 struct perf_session *evsel__session(struct evsel *evsel) 4006 { 4007 return evsel && evsel->evlist ? evsel->evlist->session : NULL; 4008 } 4009 4010 struct perf_env *evsel__env(struct evsel *evsel) 4011 { 4012 struct perf_session *session = evsel__session(evsel); 4013 4014 return session ? perf_session__env(session) : NULL; 4015 } 4016 4017 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 4018 { 4019 int cpu_map_idx, thread; 4020 4021 if (evsel__is_retire_lat(evsel)) 4022 return 0; 4023 4024 if (perf_pmu__kind(evsel->pmu) != PERF_PMU_KIND_PE) 4025 return 0; 4026 4027 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { 4028 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 4029 thread++) { 4030 int fd = FD(evsel, cpu_map_idx, thread); 4031 4032 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 4033 cpu_map_idx, thread, fd) < 0) 4034 return -1; 4035 } 4036 } 4037 4038 return 0; 4039 } 4040 4041 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 4042 { 4043 struct perf_cpu_map *cpus = evsel->core.cpus; 4044 struct perf_thread_map *threads = evsel->core.threads; 4045 4046 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr)) 4047 return -ENOMEM; 4048 4049 return store_evsel_ids(evsel, evlist); 4050 } 4051 4052 void evsel__zero_per_pkg(struct evsel *evsel) 4053 { 4054 struct hashmap_entry *cur; 4055 size_t bkt; 4056 4057 if (evsel->per_pkg_mask) { 4058 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) 4059 zfree(&cur->pkey); 4060 4061 hashmap__clear(evsel->per_pkg_mask); 4062 } 4063 } 4064 4065 /** 4066 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this 4067 * will be false on hybrid systems for hardware and legacy 4068 * cache events. 4069 */ 4070 bool evsel__is_hybrid(const struct evsel *evsel) 4071 { 4072 if (!evsel->core.is_pmu_core) 4073 return false; 4074 4075 return perf_pmus__num_core_pmus() > 1; 4076 } 4077 4078 struct evsel *evsel__leader(const struct evsel *evsel) 4079 { 4080 if (evsel->core.leader == NULL) 4081 return NULL; 4082 return container_of(evsel->core.leader, struct evsel, core); 4083 } 4084 4085 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) 4086 { 4087 return evsel->core.leader == &leader->core; 4088 } 4089 4090 bool evsel__is_leader(struct evsel *evsel) 4091 { 4092 return evsel__has_leader(evsel, evsel); 4093 } 4094 4095 void evsel__set_leader(struct evsel *evsel, struct evsel *leader) 4096 { 4097 evsel->core.leader = &leader->core; 4098 } 4099 4100 int evsel__source_count(const struct evsel *evsel) 4101 { 4102 struct evsel *pos; 4103 int count = 0; 4104 4105 evlist__for_each_entry(evsel->evlist, pos) { 4106 if (pos->metric_leader == evsel) 4107 count++; 4108 } 4109 return count; 4110 } 4111 4112 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) 4113 { 4114 return false; 4115 } 4116 4117 /* 4118 * Remove an event from a given group (leader). 4119 * Some events, e.g., perf metrics Topdown events, 4120 * must always be grouped. Ignore the events. 4121 */ 4122 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) 4123 { 4124 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { 4125 evsel__set_leader(evsel, evsel); 4126 evsel->core.nr_members = 0; 4127 leader->core.nr_members--; 4128 } 4129 } 4130 4131 bool evsel__set_needs_uniquify(struct evsel *counter, const struct perf_stat_config *config) 4132 { 4133 struct evsel *evsel; 4134 4135 if (counter->needs_uniquify) { 4136 /* Already set. */ 4137 return true; 4138 } 4139 4140 if (counter->use_config_name || counter->is_libpfm_event) { 4141 /* Original name will be used. */ 4142 return false; 4143 } 4144 4145 if (!config->hybrid_merge && evsel__is_hybrid(counter)) { 4146 /* Unique hybrid counters necessary. */ 4147 counter->needs_uniquify = true; 4148 return true; 4149 } 4150 4151 if (counter->core.attr.type < PERF_TYPE_MAX && counter->core.attr.type != PERF_TYPE_RAW) { 4152 /* Legacy event, don't uniquify. */ 4153 return false; 4154 } 4155 4156 if (counter->pmu && counter->pmu->is_core && 4157 counter->alternate_hw_config != PERF_COUNT_HW_MAX) { 4158 /* A sysfs or json event replacing a legacy event, don't uniquify. */ 4159 return false; 4160 } 4161 4162 if (config->aggr_mode == AGGR_NONE) { 4163 /* Always unique with no aggregation. */ 4164 counter->needs_uniquify = true; 4165 return true; 4166 } 4167 4168 if (counter->first_wildcard_match != NULL) { 4169 /* 4170 * If stats are merged then only the first_wildcard_match is 4171 * displayed, there is no need to uniquify this evsel as the 4172 * name won't be shown. 4173 */ 4174 return false; 4175 } 4176 4177 /* 4178 * Do other non-merged events in the evlist have the same name? If so 4179 * uniquify is necessary. 4180 */ 4181 evlist__for_each_entry(counter->evlist, evsel) { 4182 if (evsel == counter || evsel->first_wildcard_match || evsel->pmu == counter->pmu) 4183 continue; 4184 4185 if (evsel__name_is(counter, evsel__name(evsel))) { 4186 counter->needs_uniquify = true; 4187 return true; 4188 } 4189 } 4190 return false; 4191 } 4192 4193 void evsel__uniquify_counter(struct evsel *counter) 4194 { 4195 const char *name, *pmu_name, *config; 4196 char *new_name; 4197 int len, ret; 4198 4199 /* No uniquification necessary. */ 4200 if (!counter->needs_uniquify) 4201 return; 4202 4203 /* The evsel was already uniquified. */ 4204 if (counter->uniquified_name) 4205 return; 4206 4207 /* Avoid checking to uniquify twice. */ 4208 counter->uniquified_name = true; 4209 4210 name = evsel__name(counter); 4211 config = strchr(name, '/'); 4212 pmu_name = counter->pmu->name; 4213 4214 /* Already prefixed by the PMU name? */ 4215 len = pmu_name_len_no_suffix(pmu_name); 4216 4217 if (!strncmp(name, pmu_name, len)) { 4218 /* 4219 * If the PMU name is there, then there is no sense in not 4220 * having a slash. Do this for robustness. 4221 */ 4222 if (config == NULL) 4223 config = name - 1; 4224 4225 ret = asprintf(&new_name, "%s/%s", pmu_name, config + 1); 4226 } else if (config) { 4227 len = config - name; 4228 if (config[1] == '/') { 4229 /* case: event// */ 4230 ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 2); 4231 } else { 4232 /* case: event/.../ */ 4233 ret = asprintf(&new_name, "%s/%.*s,%s", pmu_name, len, name, config + 1); 4234 } 4235 } else { 4236 config = strchr(name, ':'); 4237 if (config) { 4238 /* case: event:.. */ 4239 len = config - name; 4240 4241 ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 1); 4242 } else { 4243 /* case: event */ 4244 ret = asprintf(&new_name, "%s/%s/", pmu_name, name); 4245 } 4246 } 4247 if (ret > 0) { 4248 free(counter->name); 4249 counter->name = new_name; 4250 } else { 4251 /* ENOMEM from asprintf. */ 4252 counter->uniquified_name = false; 4253 } 4254 } 4255 4256 void evsel__warn_user_requested_cpus(struct evsel *evsel, struct perf_cpu_map *user_requested_cpus) 4257 { 4258 struct perf_cpu_map *intersect, *online = NULL; 4259 const struct perf_pmu *pmu = evsel__find_pmu(evsel); 4260 4261 if (pmu && pmu->is_core) { 4262 intersect = perf_cpu_map__intersect(pmu->cpus, user_requested_cpus); 4263 } else { 4264 online = cpu_map__online(); 4265 intersect = perf_cpu_map__intersect(online, user_requested_cpus); 4266 } 4267 if (!perf_cpu_map__equal(intersect, user_requested_cpus)) { 4268 char buf1[128]; 4269 char buf2[128]; 4270 4271 cpu_map__snprint(user_requested_cpus, buf1, sizeof(buf1)); 4272 cpu_map__snprint(online ?: pmu->cpus, buf2, sizeof(buf2)); 4273 pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n", 4274 buf1, pmu ? pmu->name : "cpu", buf2, evsel__name(evsel)); 4275 } 4276 perf_cpu_map__put(intersect); 4277 perf_cpu_map__put(online); 4278 } 4279