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 "dwarf-regs.h" 38 #include "event.h" 39 #include "evsel.h" 40 #include "time-utils.h" 41 #include "util/env.h" 42 #include "util/evsel_config.h" 43 #include "util/evsel_fprintf.h" 44 #include "evlist.h" 45 #include <perf/cpumap.h> 46 #include "thread_map.h" 47 #include "target.h" 48 #include "perf_regs.h" 49 #include "record.h" 50 #include "debug.h" 51 #include "trace-event.h" 52 #include "session.h" 53 #include "stat.h" 54 #include "string2.h" 55 #include "memswap.h" 56 #include "util.h" 57 #include "util/hashmap.h" 58 #include "off_cpu.h" 59 #include "pmu.h" 60 #include "pmus.h" 61 #include "drm_pmu.h" 62 #include "hwmon_pmu.h" 63 #include "tool_pmu.h" 64 #include "tp_pmu.h" 65 #include "rlimit.h" 66 #include "../perf-sys.h" 67 #include "util/parse-branch-options.h" 68 #include "util/bpf-filter.h" 69 #include "util/hist.h" 70 #include <internal/xyarray.h> 71 #include <internal/lib.h> 72 #include <internal/threadmap.h> 73 #include "util/intel-tpebs.h" 74 75 #include <linux/ctype.h> 76 77 #ifdef HAVE_LIBTRACEEVENT 78 #include <event-parse.h> 79 #endif 80 81 struct perf_missing_features perf_missing_features; 82 83 static clockid_t clockid; 84 85 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused) 86 { 87 return 0; 88 } 89 90 static bool test_attr__enabled(void) 91 { 92 static bool test_attr__enabled; 93 static bool test_attr__enabled_tested; 94 95 if (!test_attr__enabled_tested) { 96 char *dir = getenv("PERF_TEST_ATTR"); 97 98 test_attr__enabled = (dir != NULL); 99 test_attr__enabled_tested = true; 100 } 101 return test_attr__enabled; 102 } 103 104 #define __WRITE_ASS(str, fmt, data) \ 105 do { \ 106 if (fprintf(file, #str "=%"fmt "\n", data) < 0) { \ 107 perror("test attr - failed to write event file"); \ 108 fclose(file); \ 109 return -1; \ 110 } \ 111 } while (0) 112 113 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field) 114 115 static int store_event(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu, 116 int fd, int group_fd, unsigned long flags) 117 { 118 FILE *file; 119 char path[PATH_MAX]; 120 char *dir = getenv("PERF_TEST_ATTR"); 121 122 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, 123 attr->type, attr->config, fd); 124 125 file = fopen(path, "w+"); 126 if (!file) { 127 perror("test attr - failed to open event file"); 128 return -1; 129 } 130 131 if (fprintf(file, "[event-%d-%llu-%d]\n", 132 attr->type, attr->config, fd) < 0) { 133 perror("test attr - failed to write event file"); 134 fclose(file); 135 return -1; 136 } 137 138 /* syscall arguments */ 139 __WRITE_ASS(fd, "d", fd); 140 __WRITE_ASS(group_fd, "d", group_fd); 141 __WRITE_ASS(cpu, "d", cpu.cpu); 142 __WRITE_ASS(pid, "d", pid); 143 __WRITE_ASS(flags, "lu", flags); 144 145 /* struct perf_event_attr */ 146 WRITE_ASS(type, PRIu32); 147 WRITE_ASS(size, PRIu32); 148 WRITE_ASS(config, "llu"); 149 WRITE_ASS(sample_period, "llu"); 150 WRITE_ASS(sample_type, "llu"); 151 WRITE_ASS(read_format, "llu"); 152 WRITE_ASS(disabled, "d"); 153 WRITE_ASS(inherit, "d"); 154 WRITE_ASS(pinned, "d"); 155 WRITE_ASS(exclusive, "d"); 156 WRITE_ASS(exclude_user, "d"); 157 WRITE_ASS(exclude_kernel, "d"); 158 WRITE_ASS(exclude_hv, "d"); 159 WRITE_ASS(exclude_idle, "d"); 160 WRITE_ASS(mmap, "d"); 161 WRITE_ASS(comm, "d"); 162 WRITE_ASS(freq, "d"); 163 WRITE_ASS(inherit_stat, "d"); 164 WRITE_ASS(enable_on_exec, "d"); 165 WRITE_ASS(task, "d"); 166 WRITE_ASS(watermark, "d"); 167 WRITE_ASS(precise_ip, "d"); 168 WRITE_ASS(mmap_data, "d"); 169 WRITE_ASS(sample_id_all, "d"); 170 WRITE_ASS(exclude_host, "d"); 171 WRITE_ASS(exclude_guest, "d"); 172 WRITE_ASS(exclude_callchain_kernel, "d"); 173 WRITE_ASS(exclude_callchain_user, "d"); 174 WRITE_ASS(mmap2, "d"); 175 WRITE_ASS(comm_exec, "d"); 176 WRITE_ASS(context_switch, "d"); 177 WRITE_ASS(write_backward, "d"); 178 WRITE_ASS(namespaces, "d"); 179 WRITE_ASS(use_clockid, "d"); 180 WRITE_ASS(wakeup_events, PRIu32); 181 WRITE_ASS(bp_type, PRIu32); 182 WRITE_ASS(config1, "llu"); 183 WRITE_ASS(config2, "llu"); 184 WRITE_ASS(branch_sample_type, "llu"); 185 WRITE_ASS(sample_regs_user, "llu"); 186 WRITE_ASS(sample_stack_user, PRIu32); 187 188 fclose(file); 189 return 0; 190 } 191 192 #undef __WRITE_ASS 193 #undef WRITE_ASS 194 195 static void test_attr__open(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu, 196 int fd, int group_fd, unsigned long flags) 197 { 198 int errno_saved = errno; 199 200 if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) { 201 pr_err("test attr FAILED"); 202 exit(128); 203 } 204 205 errno = errno_saved; 206 } 207 208 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused) 209 { 210 } 211 212 static struct { 213 size_t size; 214 int (*init)(struct evsel *evsel); 215 void (*fini)(struct evsel *evsel); 216 } perf_evsel__object = { 217 .size = sizeof(struct evsel), 218 .init = evsel__no_extra_init, 219 .fini = evsel__no_extra_fini, 220 }; 221 222 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel), 223 void (*fini)(struct evsel *evsel)) 224 { 225 226 if (object_size == 0) 227 goto set_methods; 228 229 if (perf_evsel__object.size > object_size) 230 return -EINVAL; 231 232 perf_evsel__object.size = object_size; 233 234 set_methods: 235 if (init != NULL) 236 perf_evsel__object.init = init; 237 238 if (fini != NULL) 239 perf_evsel__object.fini = fini; 240 241 return 0; 242 } 243 244 const char *evsel__pmu_name(const struct evsel *evsel) 245 { 246 struct perf_pmu *pmu = evsel__find_pmu(evsel); 247 248 if (pmu) 249 return pmu->name; 250 251 return event_type(evsel->core.attr.type); 252 } 253 254 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 255 256 int __evsel__sample_size(u64 sample_type) 257 { 258 u64 mask = sample_type & PERF_SAMPLE_MASK; 259 int size = 0; 260 int i; 261 262 for (i = 0; i < 64; i++) { 263 if (mask & (1ULL << i)) 264 size++; 265 } 266 267 size *= sizeof(u64); 268 269 return size; 270 } 271 272 /** 273 * __perf_evsel__calc_id_pos - calculate id_pos. 274 * @sample_type: sample type 275 * 276 * This function returns the position of the event id (PERF_SAMPLE_ID or 277 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 278 * perf_record_sample. 279 */ 280 static int __perf_evsel__calc_id_pos(u64 sample_type) 281 { 282 int idx = 0; 283 284 if (sample_type & PERF_SAMPLE_IDENTIFIER) 285 return 0; 286 287 if (!(sample_type & PERF_SAMPLE_ID)) 288 return -1; 289 290 if (sample_type & PERF_SAMPLE_IP) 291 idx += 1; 292 293 if (sample_type & PERF_SAMPLE_TID) 294 idx += 1; 295 296 if (sample_type & PERF_SAMPLE_TIME) 297 idx += 1; 298 299 if (sample_type & PERF_SAMPLE_ADDR) 300 idx += 1; 301 302 return idx; 303 } 304 305 /** 306 * __perf_evsel__calc_is_pos - calculate is_pos. 307 * @sample_type: sample type 308 * 309 * This function returns the position (counting backwards) of the event id 310 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 311 * sample_id_all is used there is an id sample appended to non-sample events. 312 */ 313 static int __perf_evsel__calc_is_pos(u64 sample_type) 314 { 315 int idx = 1; 316 317 if (sample_type & PERF_SAMPLE_IDENTIFIER) 318 return 1; 319 320 if (!(sample_type & PERF_SAMPLE_ID)) 321 return -1; 322 323 if (sample_type & PERF_SAMPLE_CPU) 324 idx += 1; 325 326 if (sample_type & PERF_SAMPLE_STREAM_ID) 327 idx += 1; 328 329 return idx; 330 } 331 332 void evsel__calc_id_pos(struct evsel *evsel) 333 { 334 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type); 335 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type); 336 } 337 338 void __evsel__set_sample_bit(struct evsel *evsel, 339 enum perf_event_sample_format bit) 340 { 341 if (!(evsel->core.attr.sample_type & bit)) { 342 evsel->core.attr.sample_type |= bit; 343 evsel->sample_size += sizeof(u64); 344 evsel__calc_id_pos(evsel); 345 } 346 } 347 348 void __evsel__reset_sample_bit(struct evsel *evsel, 349 enum perf_event_sample_format bit) 350 { 351 if (evsel->core.attr.sample_type & bit) { 352 evsel->core.attr.sample_type &= ~bit; 353 evsel->sample_size -= sizeof(u64); 354 evsel__calc_id_pos(evsel); 355 } 356 } 357 358 void evsel__set_sample_id(struct evsel *evsel, 359 bool can_sample_identifier) 360 { 361 if (can_sample_identifier) { 362 evsel__reset_sample_bit(evsel, ID); 363 evsel__set_sample_bit(evsel, IDENTIFIER); 364 } else { 365 evsel__set_sample_bit(evsel, ID); 366 } 367 evsel->core.attr.read_format |= PERF_FORMAT_ID; 368 } 369 370 /** 371 * evsel__is_function_event - Return whether given evsel is a function 372 * trace event 373 * 374 * @evsel - evsel selector to be tested 375 * 376 * Return %true if event is function trace event 377 */ 378 bool evsel__is_function_event(struct evsel *evsel) 379 { 380 #define FUNCTION_EVENT "ftrace:function" 381 382 return evsel->name && 383 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT)); 384 385 #undef FUNCTION_EVENT 386 } 387 388 void evsel__init(struct evsel *evsel, 389 struct perf_event_attr *attr, int idx) 390 { 391 perf_evsel__init(&evsel->core, attr, idx); 392 evsel->tracking = !idx; 393 evsel->unit = strdup(""); 394 evsel->scale = 1.0; 395 evsel->max_events = ULONG_MAX; 396 evsel->evlist = NULL; 397 evsel->bpf_obj = NULL; 398 evsel->bpf_fd = -1; 399 INIT_LIST_HEAD(&evsel->config_terms); 400 INIT_LIST_HEAD(&evsel->bpf_counter_list); 401 INIT_LIST_HEAD(&evsel->bpf_filters); 402 perf_evsel__object.init(evsel); 403 evsel->sample_size = __evsel__sample_size(attr->sample_type); 404 evsel__calc_id_pos(evsel); 405 evsel->cmdline_group_boundary = false; 406 evsel->per_pkg_mask = NULL; 407 evsel->collect_stat = false; 408 evsel->group_pmu_name = NULL; 409 evsel->skippable = false; 410 evsel->supported = true; 411 evsel->alternate_hw_config = PERF_COUNT_HW_MAX; 412 evsel->script_output_type = -1; // FIXME: OUTPUT_TYPE_UNSET, see builtin-script.c 413 } 414 415 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 416 { 417 struct evsel *evsel = zalloc(perf_evsel__object.size); 418 419 if (!evsel) 420 return NULL; 421 evsel__init(evsel, attr, idx); 422 423 if (evsel__is_bpf_output(evsel) && !attr->sample_type) { 424 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 425 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 426 evsel->core.attr.sample_period = 1; 427 } 428 429 if (evsel__is_clock(evsel)) { 430 free((char *)evsel->unit); 431 evsel->unit = strdup("msec"); 432 evsel->scale = 1e-6; 433 } 434 435 return evsel; 436 } 437 438 int copy_config_terms(struct list_head *dst, struct list_head *src) 439 { 440 struct evsel_config_term *pos, *tmp; 441 442 list_for_each_entry(pos, src, list) { 443 tmp = malloc(sizeof(*tmp)); 444 if (tmp == NULL) 445 return -ENOMEM; 446 447 *tmp = *pos; 448 if (tmp->free_str) { 449 tmp->val.str = strdup(pos->val.str); 450 if (tmp->val.str == NULL) { 451 free(tmp); 452 return -ENOMEM; 453 } 454 } 455 list_add_tail(&tmp->list, dst); 456 } 457 return 0; 458 } 459 460 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) 461 { 462 return copy_config_terms(&dst->config_terms, &src->config_terms); 463 } 464 465 /** 466 * evsel__clone - create a new evsel copied from @orig 467 * @orig: original evsel 468 * 469 * The assumption is that @orig is not configured nor opened yet. 470 * So we only care about the attributes that can be set while it's parsed. 471 */ 472 struct evsel *evsel__clone(struct evsel *dest, struct evsel *orig) 473 { 474 struct evsel *evsel; 475 476 BUG_ON(orig->core.fd); 477 BUG_ON(orig->counts); 478 BUG_ON(orig->priv); 479 BUG_ON(orig->per_pkg_mask); 480 481 /* cannot handle BPF objects for now */ 482 if (orig->bpf_obj) 483 return NULL; 484 485 if (dest) 486 evsel = dest; 487 else 488 evsel = evsel__new(&orig->core.attr); 489 490 if (evsel == NULL) 491 return NULL; 492 493 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus); 494 evsel->core.pmu_cpus = perf_cpu_map__get(orig->core.pmu_cpus); 495 evsel->core.threads = perf_thread_map__get(orig->core.threads); 496 evsel->core.nr_members = orig->core.nr_members; 497 evsel->core.system_wide = orig->core.system_wide; 498 evsel->core.requires_cpu = orig->core.requires_cpu; 499 evsel->core.is_pmu_core = orig->core.is_pmu_core; 500 501 if (orig->name) { 502 evsel->name = strdup(orig->name); 503 if (evsel->name == NULL) 504 goto out_err; 505 } 506 if (orig->group_name) { 507 evsel->group_name = strdup(orig->group_name); 508 if (evsel->group_name == NULL) 509 goto out_err; 510 } 511 if (orig->group_pmu_name) { 512 evsel->group_pmu_name = strdup(orig->group_pmu_name); 513 if (evsel->group_pmu_name == NULL) 514 goto out_err; 515 } 516 if (orig->filter) { 517 evsel->filter = strdup(orig->filter); 518 if (evsel->filter == NULL) 519 goto out_err; 520 } 521 if (orig->metric_id) { 522 evsel->metric_id = strdup(orig->metric_id); 523 if (evsel->metric_id == NULL) 524 goto out_err; 525 } 526 evsel->cgrp = cgroup__get(orig->cgrp); 527 #ifdef HAVE_LIBTRACEEVENT 528 if (orig->tp_sys) { 529 evsel->tp_sys = strdup(orig->tp_sys); 530 if (evsel->tp_sys == NULL) 531 goto out_err; 532 } 533 if (orig->tp_name) { 534 evsel->tp_name = strdup(orig->tp_name); 535 if (evsel->tp_name == NULL) 536 goto out_err; 537 } 538 evsel->tp_format = orig->tp_format; 539 #endif 540 evsel->handler = orig->handler; 541 evsel->core.leader = orig->core.leader; 542 evsel->metric_leader = orig->metric_leader; 543 544 evsel->max_events = orig->max_events; 545 zfree(&evsel->unit); 546 if (orig->unit) { 547 evsel->unit = strdup(orig->unit); 548 if (evsel->unit == NULL) 549 goto out_err; 550 } 551 evsel->scale = orig->scale; 552 evsel->snapshot = orig->snapshot; 553 evsel->per_pkg = orig->per_pkg; 554 evsel->percore = orig->percore; 555 evsel->precise_max = orig->precise_max; 556 evsel->is_libpfm_event = orig->is_libpfm_event; 557 558 evsel->exclude_GH = orig->exclude_GH; 559 evsel->sample_read = orig->sample_read; 560 evsel->collect_stat = orig->collect_stat; 561 evsel->weak_group = orig->weak_group; 562 evsel->use_config_name = orig->use_config_name; 563 evsel->pmu = orig->pmu; 564 evsel->first_wildcard_match = orig->first_wildcard_match; 565 566 if (evsel__copy_config_terms(evsel, orig) < 0) 567 goto out_err; 568 569 evsel->alternate_hw_config = orig->alternate_hw_config; 570 571 return evsel; 572 573 out_err: 574 evsel__delete(evsel); 575 return NULL; 576 } 577 578 /* 579 * Returns pointer with encoded error via <linux/err.h> interface. 580 */ 581 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx, bool format) 582 { 583 struct perf_event_attr attr = { 584 .type = PERF_TYPE_TRACEPOINT, 585 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 586 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 587 }; 588 struct evsel *evsel = zalloc(perf_evsel__object.size); 589 int err = -ENOMEM, id = -1; 590 591 if (evsel == NULL) 592 goto out_err; 593 594 595 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 596 goto out_free; 597 598 #ifdef HAVE_LIBTRACEEVENT 599 evsel->tp_sys = strdup(sys); 600 if (!evsel->tp_sys) 601 goto out_free; 602 603 evsel->tp_name = strdup(name); 604 if (!evsel->tp_name) 605 goto out_free; 606 #endif 607 608 event_attr_init(&attr); 609 610 if (format) { 611 id = tp_pmu__id(sys, name); 612 if (id < 0) { 613 err = id; 614 goto out_free; 615 } 616 } 617 attr.config = (__u64)id; 618 attr.sample_period = 1; 619 evsel__init(evsel, &attr, idx); 620 return evsel; 621 622 out_free: 623 zfree(&evsel->name); 624 #ifdef HAVE_LIBTRACEEVENT 625 zfree(&evsel->tp_sys); 626 zfree(&evsel->tp_name); 627 #endif 628 free(evsel); 629 out_err: 630 return ERR_PTR(err); 631 } 632 633 #ifdef HAVE_LIBTRACEEVENT 634 struct tep_event *evsel__tp_format(struct evsel *evsel) 635 { 636 struct tep_event *tp_format = evsel->tp_format; 637 638 if (tp_format) 639 return tp_format; 640 641 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT) 642 return NULL; 643 644 if (!evsel->tp_sys) 645 tp_format = trace_event__tp_format_id(evsel->core.attr.config); 646 else 647 tp_format = trace_event__tp_format(evsel->tp_sys, evsel->tp_name); 648 649 if (IS_ERR(tp_format)) { 650 int err = -PTR_ERR(evsel->tp_format); 651 652 errno = err; 653 pr_err("Error getting tracepoint format '%s': %m\n", 654 evsel__name(evsel)); 655 return NULL; 656 } 657 evsel->tp_format = tp_format; 658 return evsel->tp_format; 659 } 660 #endif 661 662 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = { 663 "cycles", 664 "instructions", 665 "cache-references", 666 "cache-misses", 667 "branches", 668 "branch-misses", 669 "bus-cycles", 670 "stalled-cycles-frontend", 671 "stalled-cycles-backend", 672 "ref-cycles", 673 }; 674 675 char *evsel__bpf_counter_events; 676 677 bool evsel__match_bpf_counter_events(const char *name) 678 { 679 int name_len; 680 bool match; 681 char *ptr; 682 683 if (!evsel__bpf_counter_events) 684 return false; 685 686 ptr = strstr(evsel__bpf_counter_events, name); 687 name_len = strlen(name); 688 689 /* check name matches a full token in evsel__bpf_counter_events */ 690 match = (ptr != NULL) && 691 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && 692 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); 693 694 return match; 695 } 696 697 static const char *__evsel__hw_name(u64 config) 698 { 699 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 700 return evsel__hw_names[config]; 701 702 return "unknown-hardware"; 703 } 704 705 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 706 { 707 int colon = 0, r = 0; 708 struct perf_event_attr *attr = &evsel->core.attr; 709 710 #define MOD_PRINT(context, mod) do { \ 711 if (!attr->exclude_##context) { \ 712 if (!colon) colon = ++r; \ 713 r += scnprintf(bf + r, size - r, "%c", mod); \ 714 } } while(0) 715 716 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 717 MOD_PRINT(kernel, 'k'); 718 MOD_PRINT(user, 'u'); 719 MOD_PRINT(hv, 'h'); 720 } 721 722 if (attr->precise_ip) { 723 if (!colon) 724 colon = ++r; 725 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 726 } 727 728 if (attr->exclude_host || attr->exclude_guest) { 729 MOD_PRINT(host, 'H'); 730 MOD_PRINT(guest, 'G'); 731 } 732 #undef MOD_PRINT 733 if (colon) 734 bf[colon - 1] = ':'; 735 return r; 736 } 737 738 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 739 { 740 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 741 } 742 743 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 744 { 745 int r = arch_evsel__hw_name(evsel, bf, size); 746 return r + evsel__add_modifiers(evsel, bf + r, size - r); 747 } 748 749 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = { 750 "cpu-clock", 751 "task-clock", 752 "page-faults", 753 "context-switches", 754 "cpu-migrations", 755 "minor-faults", 756 "major-faults", 757 "alignment-faults", 758 "emulation-faults", 759 "dummy", 760 }; 761 762 static const char *__evsel__sw_name(u64 config) 763 { 764 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 765 return evsel__sw_names[config]; 766 return "unknown-software"; 767 } 768 769 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 770 { 771 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 772 return r + evsel__add_modifiers(evsel, bf + r, size - r); 773 } 774 775 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 776 { 777 int r; 778 779 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 780 781 if (type & HW_BREAKPOINT_R) 782 r += scnprintf(bf + r, size - r, "r"); 783 784 if (type & HW_BREAKPOINT_W) 785 r += scnprintf(bf + r, size - r, "w"); 786 787 if (type & HW_BREAKPOINT_X) 788 r += scnprintf(bf + r, size - r, "x"); 789 790 return r; 791 } 792 793 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 794 { 795 struct perf_event_attr *attr = &evsel->core.attr; 796 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 797 return r + evsel__add_modifiers(evsel, bf + r, size - r); 798 } 799 800 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 801 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 802 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 803 { "LLC", "L2", }, 804 { "dTLB", "d-tlb", "Data-TLB", }, 805 { "iTLB", "i-tlb", "Instruction-TLB", }, 806 { "branch", "branches", "bpu", "btb", "bpc", }, 807 { "node", }, 808 }; 809 810 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 811 { "load", "loads", "read", }, 812 { "store", "stores", "write", }, 813 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 814 }; 815 816 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 817 { "refs", "Reference", "ops", "access", }, 818 { "misses", "miss", }, 819 }; 820 821 #define C(x) PERF_COUNT_HW_CACHE_##x 822 #define CACHE_READ (1 << C(OP_READ)) 823 #define CACHE_WRITE (1 << C(OP_WRITE)) 824 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 825 #define COP(x) (1 << x) 826 827 /* 828 * cache operation stat 829 * L1I : Read and prefetch only 830 * ITLB and BPU : Read-only 831 */ 832 static const unsigned long evsel__hw_cache_stat[C(MAX)] = { 833 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 834 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 835 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 836 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 837 [C(ITLB)] = (CACHE_READ), 838 [C(BPU)] = (CACHE_READ), 839 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 840 }; 841 842 bool evsel__is_cache_op_valid(u8 type, u8 op) 843 { 844 if (evsel__hw_cache_stat[type] & COP(op)) 845 return true; /* valid */ 846 else 847 return false; /* invalid */ 848 } 849 850 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 851 { 852 if (result) { 853 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 854 evsel__hw_cache_op[op][0], 855 evsel__hw_cache_result[result][0]); 856 } 857 858 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 859 evsel__hw_cache_op[op][1]); 860 } 861 862 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 863 { 864 u8 op, result, type = (config >> 0) & 0xff; 865 const char *err = "unknown-ext-hardware-cache-type"; 866 867 if (type >= PERF_COUNT_HW_CACHE_MAX) 868 goto out_err; 869 870 op = (config >> 8) & 0xff; 871 err = "unknown-ext-hardware-cache-op"; 872 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 873 goto out_err; 874 875 result = (config >> 16) & 0xff; 876 err = "unknown-ext-hardware-cache-result"; 877 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 878 goto out_err; 879 880 err = "invalid-cache"; 881 if (!evsel__is_cache_op_valid(type, op)) 882 goto out_err; 883 884 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 885 out_err: 886 return scnprintf(bf, size, "%s", err); 887 } 888 889 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 890 { 891 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 892 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 893 } 894 895 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 896 { 897 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 898 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 899 } 900 901 const char *evsel__name(struct evsel *evsel) 902 { 903 char bf[128]; 904 905 if (!evsel) 906 goto out_unknown; 907 908 if (evsel->name) 909 return evsel->name; 910 911 switch (evsel->core.attr.type) { 912 case PERF_TYPE_RAW: 913 evsel__raw_name(evsel, bf, sizeof(bf)); 914 break; 915 916 case PERF_TYPE_HARDWARE: 917 evsel__hw_name(evsel, bf, sizeof(bf)); 918 break; 919 920 case PERF_TYPE_HW_CACHE: 921 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 922 break; 923 924 case PERF_TYPE_SOFTWARE: 925 evsel__sw_name(evsel, bf, sizeof(bf)); 926 break; 927 928 case PERF_TYPE_TRACEPOINT: 929 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 930 break; 931 932 case PERF_TYPE_BREAKPOINT: 933 evsel__bp_name(evsel, bf, sizeof(bf)); 934 break; 935 936 case PERF_PMU_TYPE_TOOL: 937 scnprintf(bf, sizeof(bf), "%s", evsel__tool_pmu_event_name(evsel)); 938 break; 939 940 default: 941 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 942 evsel->core.attr.type); 943 break; 944 } 945 946 evsel->name = strdup(bf); 947 948 if (evsel->name) 949 return evsel->name; 950 out_unknown: 951 return "unknown"; 952 } 953 954 bool evsel__name_is(struct evsel *evsel, const char *name) 955 { 956 return !strcmp(evsel__name(evsel), name); 957 } 958 959 const char *evsel__metric_id(const struct evsel *evsel) 960 { 961 if (evsel->metric_id) 962 return evsel->metric_id; 963 964 if (evsel__is_tool(evsel)) 965 return evsel__tool_pmu_event_name(evsel); 966 967 return "unknown"; 968 } 969 970 const char *evsel__group_name(struct evsel *evsel) 971 { 972 return evsel->group_name ?: "anon group"; 973 } 974 975 /* 976 * Returns the group details for the specified leader, 977 * with following rules. 978 * 979 * For record -e '{cycles,instructions}' 980 * 'anon group { cycles:u, instructions:u }' 981 * 982 * For record -e 'cycles,instructions' and report --group 983 * 'cycles:u, instructions:u' 984 */ 985 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 986 { 987 int ret = 0; 988 bool first = true; 989 struct evsel *pos; 990 const char *group_name = evsel__group_name(evsel); 991 992 if (!evsel->forced_leader) 993 ret = scnprintf(buf, size, "%s { ", group_name); 994 995 for_each_group_evsel(pos, evsel) { 996 if (symbol_conf.skip_empty && 997 evsel__hists(pos)->stats.nr_samples == 0) 998 continue; 999 1000 ret += scnprintf(buf + ret, size - ret, "%s%s", 1001 first ? "" : ", ", evsel__name(pos)); 1002 first = false; 1003 } 1004 1005 if (!evsel->forced_leader) 1006 ret += scnprintf(buf + ret, size - ret, " }"); 1007 1008 return ret; 1009 } 1010 1011 uint16_t evsel__e_machine(struct evsel *evsel, uint32_t *e_flags) 1012 { 1013 struct perf_session *session = evsel__session(evsel); 1014 1015 return perf_session__e_machine(session, e_flags); 1016 } 1017 1018 static void __evsel__config_callchain(struct evsel *evsel, const struct record_opts *opts, 1019 const struct callchain_param *param) 1020 { 1021 bool function = evsel__is_function_event(evsel); 1022 struct perf_event_attr *attr = &evsel->core.attr; 1023 1024 if (EM_HOST == EM_S390 && param->record_mode == CALLCHAIN_FP) { 1025 pr_warning_once( 1026 "Framepointer unwinding lacks kernel support. Use '--call-graph dwarf'\n"); 1027 } 1028 1029 evsel__set_sample_bit(evsel, CALLCHAIN); 1030 1031 attr->sample_max_stack = param->max_stack; 1032 1033 if (opts->kernel_callchains) 1034 attr->exclude_callchain_user = 1; 1035 if (opts->user_callchains) 1036 attr->exclude_callchain_kernel = 1; 1037 if (param->record_mode == CALLCHAIN_LBR) { 1038 if (!opts->branch_stack) { 1039 if (attr->exclude_user) { 1040 pr_warning("LBR callstack option is only available " 1041 "to get user callchain information. " 1042 "Falling back to framepointers.\n"); 1043 } else { 1044 evsel__set_sample_bit(evsel, BRANCH_STACK); 1045 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 1046 PERF_SAMPLE_BRANCH_CALL_STACK | 1047 PERF_SAMPLE_BRANCH_NO_CYCLES | 1048 PERF_SAMPLE_BRANCH_NO_FLAGS | 1049 PERF_SAMPLE_BRANCH_HW_INDEX; 1050 } 1051 } else 1052 pr_warning("Cannot use LBR callstack with branch stack. " 1053 "Falling back to framepointers.\n"); 1054 } 1055 1056 if (param->record_mode == CALLCHAIN_DWARF) { 1057 if (!function) { 1058 uint16_t e_machine = evsel__e_machine(evsel, /*e_flags=*/NULL); 1059 1060 evsel__set_sample_bit(evsel, REGS_USER); 1061 evsel__set_sample_bit(evsel, STACK_USER); 1062 if (opts->sample_user_regs && 1063 DWARF_MINIMAL_REGS(e_machine) != perf_user_reg_mask(EM_HOST)) { 1064 attr->sample_regs_user |= DWARF_MINIMAL_REGS(e_machine); 1065 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 1066 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 1067 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 1068 } else { 1069 attr->sample_regs_user |= perf_user_reg_mask(EM_HOST); 1070 } 1071 attr->sample_stack_user = param->dump_size; 1072 attr->exclude_callchain_user = 1; 1073 } else { 1074 pr_info("Cannot use DWARF unwind for function trace event," 1075 " falling back to framepointers.\n"); 1076 } 1077 } 1078 1079 if (function) { 1080 pr_info("Disabling user space callchains for function trace event.\n"); 1081 attr->exclude_callchain_user = 1; 1082 } 1083 1084 if (param->defer && !attr->exclude_callchain_user) 1085 attr->defer_callchain = 1; 1086 } 1087 1088 void evsel__config_callchain(struct evsel *evsel, const struct record_opts *opts, 1089 const struct callchain_param *param) 1090 { 1091 if (param->enabled) 1092 return __evsel__config_callchain(evsel, opts, param); 1093 } 1094 1095 static void evsel__reset_callgraph(struct evsel *evsel, const struct callchain_param *param) 1096 { 1097 struct perf_event_attr *attr = &evsel->core.attr; 1098 1099 evsel__reset_sample_bit(evsel, CALLCHAIN); 1100 if (param->record_mode == CALLCHAIN_LBR) { 1101 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1102 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 1103 PERF_SAMPLE_BRANCH_CALL_STACK | 1104 PERF_SAMPLE_BRANCH_HW_INDEX); 1105 } 1106 if (param->record_mode == CALLCHAIN_DWARF) { 1107 evsel__reset_sample_bit(evsel, REGS_USER); 1108 evsel__reset_sample_bit(evsel, STACK_USER); 1109 } 1110 } 1111 1112 static void evsel__apply_ratio_to_prev(struct evsel *evsel, 1113 struct perf_event_attr *attr, 1114 const struct record_opts *opts, 1115 const char *buf) 1116 { 1117 struct perf_event_attr *prev_attr = NULL; 1118 struct evsel *evsel_prev = NULL; 1119 u64 type = evsel->core.attr.sample_type; 1120 u64 prev_type = 0; 1121 double rtp; 1122 1123 rtp = strtod(buf, NULL); 1124 if (rtp <= 0) { 1125 pr_err("Invalid ratio-to-prev value %lf\n", rtp); 1126 return; 1127 } 1128 if (evsel == evsel__leader(evsel)) { 1129 pr_err("Invalid use of ratio-to-prev term without preceding element in group\n"); 1130 return; 1131 } 1132 if (!evsel->pmu->is_core) { 1133 pr_err("Event using ratio-to-prev term must have a core PMU\n"); 1134 return; 1135 } 1136 1137 evsel_prev = evsel__prev(evsel); 1138 if (!evsel_prev) { 1139 pr_err("Previous event does not exist.\n"); 1140 return; 1141 } 1142 1143 if (evsel_prev->pmu->type != evsel->pmu->type) { 1144 pr_err("Compared events (\"%s\", \"%s\") must have same PMU\n", 1145 evsel->name, evsel_prev->name); 1146 return; 1147 } 1148 1149 prev_attr = &evsel_prev->core.attr; 1150 prev_type = evsel_prev->core.attr.sample_type; 1151 1152 if (!(prev_type & PERF_SAMPLE_PERIOD)) { 1153 attr->sample_period = prev_attr->sample_period * rtp; 1154 attr->freq = 0; 1155 evsel__reset_sample_bit(evsel, PERIOD); 1156 } else if (!(type & PERF_SAMPLE_PERIOD)) { 1157 prev_attr->sample_period = attr->sample_period / rtp; 1158 prev_attr->freq = 0; 1159 evsel__reset_sample_bit(evsel_prev, PERIOD); 1160 } else { 1161 if (opts->user_interval != ULLONG_MAX) { 1162 prev_attr->sample_period = opts->user_interval; 1163 attr->sample_period = prev_attr->sample_period * rtp; 1164 prev_attr->freq = 0; 1165 attr->freq = 0; 1166 evsel__reset_sample_bit(evsel_prev, PERIOD); 1167 evsel__reset_sample_bit(evsel, PERIOD); 1168 } else { 1169 pr_err("Event period term or count (-c) must be set when using ratio-to-prev term.\n"); 1170 return; 1171 } 1172 } 1173 1174 arch_evsel__apply_ratio_to_prev(evsel, attr); 1175 } 1176 1177 static void evsel__apply_config_terms(struct evsel *evsel, 1178 const struct record_opts *opts, bool track) 1179 { 1180 struct evsel_config_term *term; 1181 struct list_head *config_terms = &evsel->config_terms; 1182 struct perf_event_attr *attr = &evsel->core.attr; 1183 /* callgraph default */ 1184 struct callchain_param param = { 1185 .record_mode = callchain_param.record_mode, 1186 }; 1187 u32 dump_size = 0; 1188 int max_stack = 0; 1189 const char *callgraph_buf = NULL; 1190 const char *rtp_buf = NULL; 1191 1192 list_for_each_entry(term, config_terms, list) { 1193 switch (term->type) { 1194 case EVSEL__CONFIG_TERM_PERIOD: 1195 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 1196 attr->sample_period = term->val.period; 1197 attr->freq = 0; 1198 evsel__reset_sample_bit(evsel, PERIOD); 1199 } 1200 break; 1201 case EVSEL__CONFIG_TERM_FREQ: 1202 if (!(term->weak && opts->user_freq != UINT_MAX)) { 1203 attr->sample_freq = term->val.freq; 1204 attr->freq = 1; 1205 evsel__set_sample_bit(evsel, PERIOD); 1206 } 1207 break; 1208 case EVSEL__CONFIG_TERM_TIME: 1209 if (term->val.time) 1210 evsel__set_sample_bit(evsel, TIME); 1211 else 1212 evsel__reset_sample_bit(evsel, TIME); 1213 break; 1214 case EVSEL__CONFIG_TERM_CALLGRAPH: 1215 callgraph_buf = term->val.str; 1216 break; 1217 case EVSEL__CONFIG_TERM_BRANCH: 1218 if (term->val.str && strcmp(term->val.str, "no")) { 1219 evsel__set_sample_bit(evsel, BRANCH_STACK); 1220 parse_branch_str(term->val.str, 1221 &attr->branch_sample_type); 1222 } else 1223 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1224 break; 1225 case EVSEL__CONFIG_TERM_STACK_USER: 1226 dump_size = term->val.stack_user; 1227 break; 1228 case EVSEL__CONFIG_TERM_MAX_STACK: 1229 max_stack = term->val.max_stack; 1230 break; 1231 case EVSEL__CONFIG_TERM_MAX_EVENTS: 1232 evsel->max_events = term->val.max_events; 1233 break; 1234 case EVSEL__CONFIG_TERM_INHERIT: 1235 /* 1236 * attr->inherit should has already been set by 1237 * evsel__config. If user explicitly set 1238 * inherit using config terms, override global 1239 * opt->no_inherit setting. 1240 */ 1241 attr->inherit = term->val.inherit ? 1 : 0; 1242 break; 1243 case EVSEL__CONFIG_TERM_OVERWRITE: 1244 attr->write_backward = term->val.overwrite ? 1 : 0; 1245 break; 1246 case EVSEL__CONFIG_TERM_DRV_CFG: 1247 break; 1248 case EVSEL__CONFIG_TERM_PERCORE: 1249 break; 1250 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 1251 attr->aux_output = term->val.aux_output ? 1 : 0; 1252 break; 1253 case EVSEL__CONFIG_TERM_AUX_ACTION: 1254 /* Already applied by auxtrace */ 1255 break; 1256 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 1257 /* Already applied by auxtrace */ 1258 break; 1259 case EVSEL__CONFIG_TERM_USR_CHG_CONFIG: 1260 case EVSEL__CONFIG_TERM_USR_CHG_CONFIG1: 1261 case EVSEL__CONFIG_TERM_USR_CHG_CONFIG2: 1262 case EVSEL__CONFIG_TERM_USR_CHG_CONFIG3: 1263 case EVSEL__CONFIG_TERM_USR_CHG_CONFIG4: 1264 break; 1265 case EVSEL__CONFIG_TERM_RATIO_TO_PREV: 1266 rtp_buf = term->val.str; 1267 break; 1268 default: 1269 break; 1270 } 1271 } 1272 1273 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 1274 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 1275 bool sample_address = false; 1276 1277 if (max_stack) { 1278 param.max_stack = max_stack; 1279 if (callgraph_buf == NULL) 1280 callgraph_buf = "fp"; 1281 } 1282 1283 /* parse callgraph parameters */ 1284 if (callgraph_buf != NULL) { 1285 if (!strcmp(callgraph_buf, "no")) { 1286 param.enabled = false; 1287 param.record_mode = CALLCHAIN_NONE; 1288 } else { 1289 param.enabled = true; 1290 if (parse_callchain_record(callgraph_buf, ¶m)) { 1291 pr_err("per-event callgraph setting for %s failed. " 1292 "Apply callgraph global setting for it\n", 1293 evsel->name); 1294 return; 1295 } 1296 if (param.record_mode == CALLCHAIN_DWARF) 1297 sample_address = true; 1298 } 1299 } 1300 if (dump_size > 0) { 1301 dump_size = round_up(dump_size, sizeof(u64)); 1302 param.dump_size = dump_size; 1303 } 1304 1305 /* If global callgraph set, clear it */ 1306 if (callchain_param.enabled) 1307 evsel__reset_callgraph(evsel, &callchain_param); 1308 1309 /* set perf-event callgraph */ 1310 if (param.enabled) { 1311 if (sample_address) { 1312 evsel__set_sample_bit(evsel, ADDR); 1313 evsel__set_sample_bit(evsel, DATA_SRC); 1314 evsel->core.attr.mmap_data = track; 1315 } 1316 evsel__config_callchain(evsel, opts, ¶m); 1317 } 1318 } 1319 if (rtp_buf) 1320 evsel__apply_ratio_to_prev(evsel, attr, opts, rtp_buf); 1321 } 1322 1323 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 1324 { 1325 struct evsel_config_term *term, *found_term = NULL; 1326 1327 list_for_each_entry(term, &evsel->config_terms, list) { 1328 if (term->type == type) 1329 found_term = term; 1330 } 1331 1332 return found_term; 1333 } 1334 1335 /* 1336 * Set @config_name to @val as long as the user hasn't already set or cleared it 1337 * by passing a config term on the command line. 1338 * 1339 * @val is the value to put into the bits specified by @config_name rather than 1340 * the bit pattern. It is shifted into position by this function, so to set 1341 * something to true, pass 1 for val rather than a pre shifted value. 1342 */ 1343 void evsel__set_config_if_unset(struct evsel *evsel, const char *config_name, 1344 u64 val) 1345 { 1346 u64 user_bits = 0; 1347 struct evsel_config_term *term = evsel__get_config_term(evsel, 1348 USR_CHG_CONFIG); 1349 struct perf_pmu_format *format = pmu_find_format(&evsel->pmu->format, 1350 config_name); 1351 int fbit; 1352 __u64 *vp; 1353 1354 if (!format) 1355 return; 1356 1357 switch (format->value) { 1358 case PERF_PMU_FORMAT_VALUE_CONFIG: 1359 term = evsel__get_config_term(evsel, USR_CHG_CONFIG); 1360 vp = &evsel->core.attr.config; 1361 break; 1362 case PERF_PMU_FORMAT_VALUE_CONFIG1: 1363 term = evsel__get_config_term(evsel, USR_CHG_CONFIG1); 1364 vp = &evsel->core.attr.config1; 1365 break; 1366 case PERF_PMU_FORMAT_VALUE_CONFIG2: 1367 term = evsel__get_config_term(evsel, USR_CHG_CONFIG2); 1368 vp = &evsel->core.attr.config2; 1369 break; 1370 case PERF_PMU_FORMAT_VALUE_CONFIG3: 1371 term = evsel__get_config_term(evsel, USR_CHG_CONFIG3); 1372 vp = &evsel->core.attr.config3; 1373 break; 1374 case PERF_PMU_FORMAT_VALUE_CONFIG4: 1375 term = evsel__get_config_term(evsel, USR_CHG_CONFIG4); 1376 vp = &evsel->core.attr.config4; 1377 break; 1378 default: 1379 pr_err("Unknown format value: %d\n", format->value); 1380 return; 1381 } 1382 1383 if (!format) 1384 return; 1385 1386 if (term) 1387 user_bits = term->val.cfg_chg; 1388 1389 /* Do nothing if the user changed the value */ 1390 for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS) 1391 if ((1ULL << fbit) & user_bits) 1392 return; 1393 1394 /* Otherwise replace it */ 1395 perf_pmu__format_pack(format->bits, val, vp, /*zero=*/true); 1396 } 1397 1398 1399 int evsel__get_config_val(const struct evsel *evsel, const char *config_name, 1400 u64 *val) 1401 { 1402 struct perf_pmu_format *format = pmu_find_format(&evsel->pmu->format, config_name); 1403 1404 if (!format || bitmap_empty(format->bits, PERF_PMU_FORMAT_BITS)) { 1405 pr_err("Unknown/empty format name: %s\n", config_name); 1406 *val = 0; 1407 return -EINVAL; 1408 } 1409 1410 switch (format->value) { 1411 case PERF_PMU_FORMAT_VALUE_CONFIG: 1412 *val = perf_pmu__format_unpack(format->bits, 1413 evsel->core.attr.config); 1414 return 0; 1415 case PERF_PMU_FORMAT_VALUE_CONFIG1: 1416 *val = perf_pmu__format_unpack(format->bits, 1417 evsel->core.attr.config1); 1418 return 0; 1419 case PERF_PMU_FORMAT_VALUE_CONFIG2: 1420 *val = perf_pmu__format_unpack(format->bits, 1421 evsel->core.attr.config2); 1422 return 0; 1423 case PERF_PMU_FORMAT_VALUE_CONFIG3: 1424 *val = perf_pmu__format_unpack(format->bits, 1425 evsel->core.attr.config3); 1426 return 0; 1427 case PERF_PMU_FORMAT_VALUE_CONFIG4: 1428 *val = perf_pmu__format_unpack(format->bits, 1429 evsel->core.attr.config4); 1430 return 0; 1431 default: 1432 pr_err("Unknown format value: %d\n", format->value); 1433 *val = 0; 1434 return -EINVAL; 1435 } 1436 } 1437 1438 void __weak arch_evsel__set_sample_weight(struct evsel *evsel) 1439 { 1440 evsel__set_sample_bit(evsel, WEIGHT); 1441 } 1442 1443 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, 1444 struct perf_event_attr *attr __maybe_unused) 1445 { 1446 } 1447 1448 void __weak arch_evsel__apply_ratio_to_prev(struct evsel *evsel __maybe_unused, 1449 struct perf_event_attr *attr __maybe_unused) 1450 { 1451 } 1452 1453 static void evsel__set_default_freq_period(const struct record_opts *opts, 1454 struct perf_event_attr *attr) 1455 { 1456 if (opts->freq) { 1457 attr->freq = 1; 1458 attr->sample_freq = opts->freq; 1459 } else { 1460 attr->sample_period = opts->default_interval; 1461 } 1462 } 1463 1464 bool evsel__is_offcpu_event(struct evsel *evsel) 1465 { 1466 return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT) && 1467 evsel->core.attr.sample_type & PERF_SAMPLE_RAW; 1468 } 1469 1470 /* 1471 * The enable_on_exec/disabled value strategy: 1472 * 1473 * 1) For any type of traced program: 1474 * - all independent events and group leaders are disabled 1475 * - all group members are enabled 1476 * 1477 * Group members are ruled by group leaders. They need to 1478 * be enabled, because the group scheduling relies on that. 1479 * 1480 * 2) For traced programs executed by perf: 1481 * - all independent events and group leaders have 1482 * enable_on_exec set 1483 * - we don't specifically enable or disable any event during 1484 * the record command 1485 * 1486 * Independent events and group leaders are initially disabled 1487 * and get enabled by exec. Group members are ruled by group 1488 * leaders as stated in 1). 1489 * 1490 * 3) For traced programs attached by perf (pid/tid): 1491 * - we specifically enable or disable all events during 1492 * the record command 1493 * 1494 * When attaching events to already running traced we 1495 * enable/disable events specifically, as there's no 1496 * initial traced exec call. 1497 */ 1498 void evsel__config(struct evsel *evsel, const struct record_opts *opts, 1499 const struct callchain_param *callchain) 1500 { 1501 struct evsel *leader = evsel__leader(evsel); 1502 struct perf_event_attr *attr = &evsel->core.attr; 1503 int track = evsel->tracking; 1504 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 1505 1506 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 1507 attr->inherit = target__has_cpu(&opts->target) ? 0 : !opts->no_inherit; 1508 attr->write_backward = opts->overwrite ? 1 : 0; 1509 attr->read_format = PERF_FORMAT_LOST; 1510 1511 evsel__set_sample_bit(evsel, IP); 1512 evsel__set_sample_bit(evsel, TID); 1513 1514 if (evsel->sample_read) { 1515 evsel__set_sample_bit(evsel, READ); 1516 1517 /* 1518 * We need ID even in case of single event, because 1519 * PERF_SAMPLE_READ process ID specific data. 1520 */ 1521 evsel__set_sample_id(evsel, false); 1522 1523 /* 1524 * Apply group format only if we belong to group 1525 * with more than one members. 1526 */ 1527 if (leader->core.nr_members > 1) { 1528 attr->read_format |= PERF_FORMAT_GROUP; 1529 } 1530 1531 /* 1532 * Inherit + SAMPLE_READ requires SAMPLE_TID in the read_format 1533 */ 1534 if (attr->inherit) { 1535 evsel__set_sample_bit(evsel, TID); 1536 evsel->core.attr.read_format |= 1537 PERF_FORMAT_ID; 1538 } 1539 } 1540 1541 /* 1542 * We default some events to have a default interval. But keep 1543 * it a weak assumption overridable by the user. 1544 */ 1545 if ((evsel->is_libpfm_event && !attr->sample_period) || 1546 (!evsel->is_libpfm_event && (!attr->sample_period || 1547 opts->user_freq != UINT_MAX || 1548 opts->user_interval != ULLONG_MAX))) 1549 evsel__set_default_freq_period(opts, attr); 1550 1551 /* 1552 * If attr->freq was set (here or earlier), ask for period 1553 * to be sampled. 1554 */ 1555 if (attr->freq) 1556 evsel__set_sample_bit(evsel, PERIOD); 1557 1558 if (opts->no_samples) 1559 attr->sample_freq = 0; 1560 1561 if (opts->inherit_stat) { 1562 evsel->core.attr.read_format |= 1563 PERF_FORMAT_TOTAL_TIME_ENABLED | 1564 PERF_FORMAT_TOTAL_TIME_RUNNING | 1565 PERF_FORMAT_ID; 1566 attr->inherit_stat = 1; 1567 } 1568 1569 if (opts->sample_address) 1570 evsel__set_sample_bit(evsel, ADDR); 1571 1572 if (opts->record_data_mmap) 1573 attr->mmap_data = track; 1574 1575 /* 1576 * We don't allow user space callchains for function trace 1577 * event, due to issues with page faults while tracing page 1578 * fault handler and its overall trickiness nature. 1579 */ 1580 if (evsel__is_function_event(evsel)) 1581 evsel->core.attr.exclude_callchain_user = 1; 1582 1583 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1584 evsel__config_callchain(evsel, opts, callchain); 1585 1586 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1587 !evsel__is_dummy_event(evsel)) { 1588 attr->sample_regs_intr = opts->sample_intr_regs; 1589 evsel__set_sample_bit(evsel, REGS_INTR); 1590 } 1591 1592 if (opts->sample_user_regs && !evsel->no_aux_samples && 1593 !evsel__is_dummy_event(evsel)) { 1594 attr->sample_regs_user |= opts->sample_user_regs; 1595 evsel__set_sample_bit(evsel, REGS_USER); 1596 } 1597 1598 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1599 evsel__set_sample_bit(evsel, CPU); 1600 1601 /* 1602 * When the user explicitly disabled time don't force it here. 1603 */ 1604 if (opts->sample_time && 1605 (!perf_missing_features.sample_id_all && 1606 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1607 opts->sample_time_set))) 1608 evsel__set_sample_bit(evsel, TIME); 1609 1610 if (opts->raw_samples && !evsel->no_aux_samples) { 1611 evsel__set_sample_bit(evsel, TIME); 1612 evsel__set_sample_bit(evsel, RAW); 1613 evsel__set_sample_bit(evsel, CPU); 1614 } 1615 1616 if (opts->sample_data_src) 1617 evsel__set_sample_bit(evsel, DATA_SRC); 1618 1619 if (opts->sample_phys_addr) 1620 evsel__set_sample_bit(evsel, PHYS_ADDR); 1621 1622 if (opts->no_buffering) { 1623 attr->watermark = 0; 1624 attr->wakeup_events = 1; 1625 } 1626 if (opts->branch_stack && !evsel->no_aux_samples) { 1627 evsel__set_sample_bit(evsel, BRANCH_STACK); 1628 attr->branch_sample_type = opts->branch_stack; 1629 } 1630 1631 if (opts->sample_weight || evsel->retire_lat) { 1632 arch_evsel__set_sample_weight(evsel); 1633 evsel->retire_lat = false; 1634 } 1635 attr->task = track; 1636 attr->mmap = track; 1637 attr->mmap2 = track && !perf_missing_features.mmap2; 1638 attr->comm = track; 1639 attr->build_id = track && opts->build_id; 1640 attr->defer_output = track && callchain && callchain->defer; 1641 1642 /* 1643 * ksymbol is tracked separately with text poke because it needs to be 1644 * system wide and enabled immediately. 1645 */ 1646 if (!opts->text_poke) 1647 attr->ksymbol = track && !perf_missing_features.ksymbol; 1648 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1649 1650 if (opts->record_namespaces) 1651 attr->namespaces = track; 1652 1653 if (opts->record_cgroup) { 1654 attr->cgroup = track && !perf_missing_features.cgroup; 1655 evsel__set_sample_bit(evsel, CGROUP); 1656 } 1657 1658 if (opts->sample_data_page_size) 1659 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); 1660 1661 if (opts->sample_code_page_size) 1662 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); 1663 1664 if (opts->record_switch_events) 1665 attr->context_switch = track; 1666 1667 if (opts->sample_transaction) 1668 evsel__set_sample_bit(evsel, TRANSACTION); 1669 1670 if (opts->running_time) { 1671 evsel->core.attr.read_format |= 1672 PERF_FORMAT_TOTAL_TIME_ENABLED | 1673 PERF_FORMAT_TOTAL_TIME_RUNNING; 1674 } 1675 1676 /* 1677 * XXX see the function comment above 1678 * 1679 * Disabling only independent events or group leaders, 1680 * keeping group members enabled. 1681 */ 1682 if (evsel__is_group_leader(evsel)) 1683 attr->disabled = 1; 1684 1685 /* 1686 * Setting enable_on_exec for independent events and 1687 * group leaders for traced executed by perf. 1688 */ 1689 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1690 !opts->target.initial_delay) 1691 attr->enable_on_exec = 1; 1692 1693 if (evsel->immediate) { 1694 attr->disabled = 0; 1695 attr->enable_on_exec = 0; 1696 } 1697 1698 clockid = opts->clockid; 1699 if (opts->use_clockid) { 1700 attr->use_clockid = 1; 1701 attr->clockid = opts->clockid; 1702 } 1703 1704 if (evsel->precise_max) 1705 attr->precise_ip = 3; 1706 1707 if (opts->all_user) { 1708 attr->exclude_kernel = 1; 1709 attr->exclude_user = 0; 1710 } 1711 1712 if (opts->all_kernel) { 1713 attr->exclude_kernel = 0; 1714 attr->exclude_user = 1; 1715 } 1716 1717 if (evsel->core.pmu_cpus || evsel->unit) 1718 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1719 1720 /* 1721 * Apply event specific term settings, 1722 * it overloads any global configuration. 1723 */ 1724 evsel__apply_config_terms(evsel, opts, track); 1725 1726 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1727 1728 /* The --period option takes the precedence. */ 1729 if (opts->period_set) { 1730 if (opts->period) 1731 evsel__set_sample_bit(evsel, PERIOD); 1732 else 1733 evsel__reset_sample_bit(evsel, PERIOD); 1734 } 1735 1736 /* 1737 * A dummy event never triggers any actual counter and therefore 1738 * cannot be used with branch_stack. 1739 * 1740 * For initial_delay, a dummy event is added implicitly. 1741 * The software event will trigger -EOPNOTSUPP error out, 1742 * if BRANCH_STACK bit is set. 1743 */ 1744 if (evsel__is_dummy_event(evsel)) 1745 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1746 1747 if (evsel__is_offcpu_event(evsel)) { 1748 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; 1749 attr->inherit = 0; 1750 } 1751 1752 arch__post_evsel_config(evsel, attr); 1753 } 1754 1755 int evsel__set_filter(struct evsel *evsel, const char *filter) 1756 { 1757 char *new_filter = strdup(filter); 1758 1759 if (new_filter != NULL) { 1760 free(evsel->filter); 1761 evsel->filter = new_filter; 1762 return 0; 1763 } 1764 1765 return -1; 1766 } 1767 1768 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1769 { 1770 char *new_filter; 1771 1772 if (evsel->filter == NULL) 1773 return evsel__set_filter(evsel, filter); 1774 1775 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1776 free(evsel->filter); 1777 evsel->filter = new_filter; 1778 return 0; 1779 } 1780 1781 return -1; 1782 } 1783 1784 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1785 { 1786 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1787 } 1788 1789 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1790 { 1791 return evsel__append_filter(evsel, "%s,%s", filter); 1792 } 1793 1794 /* Caller has to clear disabled after going through all CPUs. */ 1795 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx) 1796 { 1797 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); 1798 } 1799 1800 int evsel__enable(struct evsel *evsel) 1801 { 1802 int err = perf_evsel__enable(&evsel->core); 1803 1804 if (!err) 1805 evsel->disabled = false; 1806 return err; 1807 } 1808 1809 /* Caller has to set disabled after going through all CPUs. */ 1810 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx) 1811 { 1812 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); 1813 } 1814 1815 int evsel__disable(struct evsel *evsel) 1816 { 1817 int err = perf_evsel__disable(&evsel->core); 1818 /* 1819 * We mark it disabled here so that tools that disable a event can 1820 * ignore events after they disable it. I.e. the ring buffer may have 1821 * already a few more events queued up before the kernel got the stop 1822 * request. 1823 */ 1824 if (!err) 1825 evsel->disabled = true; 1826 1827 return err; 1828 } 1829 1830 void free_config_terms(struct list_head *config_terms) 1831 { 1832 struct evsel_config_term *term, *h; 1833 1834 list_for_each_entry_safe(term, h, config_terms, list) { 1835 list_del_init(&term->list); 1836 if (term->free_str) 1837 zfree(&term->val.str); 1838 free(term); 1839 } 1840 } 1841 1842 static void evsel__free_config_terms(struct evsel *evsel) 1843 { 1844 free_config_terms(&evsel->config_terms); 1845 } 1846 1847 static void (*evsel__priv_destructor)(void *priv); 1848 1849 void evsel__set_priv_destructor(void (*destructor)(void *priv)) 1850 { 1851 assert(evsel__priv_destructor == NULL); 1852 1853 evsel__priv_destructor = destructor; 1854 } 1855 1856 void evsel__exit(struct evsel *evsel) 1857 { 1858 assert(list_empty(&evsel->core.node)); 1859 assert(evsel->evlist == NULL); 1860 if (evsel__is_retire_lat(evsel)) 1861 evsel__tpebs_close(evsel); 1862 bpf_counter__destroy(evsel); 1863 perf_bpf_filter__destroy(evsel); 1864 evsel__free_counts(evsel); 1865 perf_evsel__free_fd(&evsel->core); 1866 perf_evsel__free_id(&evsel->core); 1867 evsel__free_config_terms(evsel); 1868 cgroup__put(evsel->cgrp); 1869 perf_evsel__exit(&evsel->core); 1870 zfree(&evsel->group_name); 1871 zfree(&evsel->name); 1872 #ifdef HAVE_LIBTRACEEVENT 1873 zfree(&evsel->tp_sys); 1874 zfree(&evsel->tp_name); 1875 #endif 1876 zfree(&evsel->filter); 1877 zfree(&evsel->group_pmu_name); 1878 zfree(&evsel->unit); 1879 zfree(&evsel->metric_id); 1880 evsel__zero_per_pkg(evsel); 1881 hashmap__free(evsel->per_pkg_mask); 1882 evsel->per_pkg_mask = NULL; 1883 if (evsel__priv_destructor) 1884 evsel__priv_destructor(evsel->priv); 1885 perf_evsel__object.fini(evsel); 1886 if (evsel__tool_event(evsel) == TOOL_PMU__EVENT_SYSTEM_TIME || 1887 evsel__tool_event(evsel) == TOOL_PMU__EVENT_USER_TIME) 1888 xyarray__delete(evsel->start_times); 1889 } 1890 1891 void evsel__delete(struct evsel *evsel) 1892 { 1893 if (!evsel) 1894 return; 1895 1896 evsel__exit(evsel); 1897 free(evsel); 1898 } 1899 1900 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread, 1901 struct perf_counts_values *count) 1902 { 1903 struct perf_counts_values tmp; 1904 1905 if (!evsel->prev_raw_counts) 1906 return; 1907 1908 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); 1909 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; 1910 1911 count->val = count->val - tmp.val; 1912 count->ena = count->ena - tmp.ena; 1913 count->run = count->run - tmp.run; 1914 } 1915 1916 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) 1917 { 1918 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); 1919 1920 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); 1921 } 1922 1923 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, 1924 u64 val, u64 ena, u64 run, u64 lost) 1925 { 1926 struct perf_counts_values *count; 1927 1928 count = perf_counts(counter->counts, cpu_map_idx, thread); 1929 1930 if (evsel__is_retire_lat(counter)) { 1931 evsel__tpebs_read(counter, cpu_map_idx, thread); 1932 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1933 return; 1934 } 1935 1936 count->val = val; 1937 count->ena = ena; 1938 count->run = run; 1939 count->lost = lost; 1940 1941 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1942 } 1943 1944 static bool evsel__group_has_tpebs(struct evsel *leader) 1945 { 1946 struct evsel *evsel; 1947 1948 for_each_group_evsel(evsel, leader) { 1949 if (evsel__is_retire_lat(evsel)) 1950 return true; 1951 } 1952 return false; 1953 } 1954 1955 static u64 evsel__group_read_nr_members(struct evsel *leader) 1956 { 1957 u64 nr = leader->core.nr_members; 1958 struct evsel *evsel; 1959 1960 for_each_group_evsel(evsel, leader) { 1961 if (evsel__is_retire_lat(evsel)) 1962 nr--; 1963 } 1964 return nr; 1965 } 1966 1967 static u64 evsel__group_read_size(struct evsel *leader) 1968 { 1969 u64 read_format = leader->core.attr.read_format; 1970 int entry = sizeof(u64); /* value */ 1971 int size = 0; 1972 int nr = 1; 1973 1974 if (!evsel__group_has_tpebs(leader)) 1975 return perf_evsel__read_size(&leader->core); 1976 1977 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1978 size += sizeof(u64); 1979 1980 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1981 size += sizeof(u64); 1982 1983 if (read_format & PERF_FORMAT_ID) 1984 entry += sizeof(u64); 1985 1986 if (read_format & PERF_FORMAT_LOST) 1987 entry += sizeof(u64); 1988 1989 if (read_format & PERF_FORMAT_GROUP) { 1990 nr = evsel__group_read_nr_members(leader); 1991 size += sizeof(u64); 1992 } 1993 1994 size += entry * nr; 1995 return size; 1996 } 1997 1998 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) 1999 { 2000 u64 read_format = leader->core.attr.read_format; 2001 struct sample_read_value *v; 2002 u64 nr, ena = 0, run = 0, lost = 0; 2003 2004 nr = *data++; 2005 2006 if (nr != evsel__group_read_nr_members(leader)) 2007 return -EINVAL; 2008 2009 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 2010 ena = *data++; 2011 2012 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 2013 run = *data++; 2014 2015 v = (void *)data; 2016 sample_read_group__for_each(v, nr, read_format) { 2017 struct evsel *counter; 2018 2019 counter = evlist__id2evsel(leader->evlist, v->id); 2020 if (!counter) 2021 return -EINVAL; 2022 2023 if (read_format & PERF_FORMAT_LOST) 2024 lost = v->lost; 2025 2026 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); 2027 } 2028 2029 return 0; 2030 } 2031 2032 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread) 2033 { 2034 struct perf_stat_evsel *ps = leader->stats; 2035 u64 read_format = leader->core.attr.read_format; 2036 int size = evsel__group_read_size(leader); 2037 u64 *data = ps->group_data; 2038 2039 if (!(read_format & PERF_FORMAT_ID)) 2040 return -EINVAL; 2041 2042 if (!evsel__is_group_leader(leader)) 2043 return -EINVAL; 2044 2045 if (!data) { 2046 data = zalloc(size); 2047 if (!data) 2048 return -ENOMEM; 2049 2050 ps->group_data = data; 2051 } 2052 2053 if (FD(leader, cpu_map_idx, thread) < 0) 2054 return -EINVAL; 2055 2056 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) 2057 return -errno; 2058 2059 return evsel__process_group_data(leader, cpu_map_idx, thread, data); 2060 } 2061 2062 bool __evsel__match(const struct evsel *evsel, u32 type, u64 config) 2063 { 2064 2065 u32 e_type = evsel->core.attr.type; 2066 u64 e_config = evsel->core.attr.config; 2067 2068 if (e_type == type && e_config == config) 2069 return true; 2070 if (type != PERF_TYPE_HARDWARE && type != PERF_TYPE_HW_CACHE) 2071 return false; 2072 if ((e_type == PERF_TYPE_HARDWARE || e_type == PERF_TYPE_HW_CACHE) && 2073 perf_pmus__supports_extended_type()) 2074 e_config &= PERF_HW_EVENT_MASK; 2075 if (e_type == type && e_config == config) 2076 return true; 2077 if (type == PERF_TYPE_HARDWARE && evsel->pmu && evsel->pmu->is_core && 2078 evsel->alternate_hw_config == config) 2079 return true; 2080 return false; 2081 } 2082 2083 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) 2084 { 2085 if (evsel__is_tool(evsel)) 2086 return evsel__tool_pmu_read(evsel, cpu_map_idx, thread); 2087 2088 if (evsel__is_hwmon(evsel)) 2089 return evsel__hwmon_pmu_read(evsel, cpu_map_idx, thread); 2090 2091 if (evsel__is_drm(evsel)) 2092 return evsel__drm_pmu_read(evsel, cpu_map_idx, thread); 2093 2094 if (evsel__is_retire_lat(evsel)) 2095 return evsel__tpebs_read(evsel, cpu_map_idx, thread); 2096 2097 if (evsel->core.attr.read_format & PERF_FORMAT_GROUP) 2098 return evsel__read_group(evsel, cpu_map_idx, thread); 2099 2100 return evsel__read_one(evsel, cpu_map_idx, thread); 2101 } 2102 2103 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) 2104 { 2105 struct perf_counts_values count; 2106 size_t nv = scale ? 3 : 1; 2107 2108 if (FD(evsel, cpu_map_idx, thread) < 0) 2109 return -EINVAL; 2110 2111 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) 2112 return -ENOMEM; 2113 2114 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) 2115 return -errno; 2116 2117 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); 2118 perf_counts_values__scale(&count, scale, NULL); 2119 *perf_counts(evsel->counts, cpu_map_idx, thread) = count; 2120 return 0; 2121 } 2122 2123 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, 2124 int cpu_map_idx) 2125 { 2126 struct perf_cpu cpu; 2127 2128 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); 2129 return perf_cpu_map__idx(other->core.cpus, cpu); 2130 } 2131 2132 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) 2133 { 2134 struct evsel *leader = evsel__leader(evsel); 2135 2136 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || 2137 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { 2138 return evsel__match_other_cpu(evsel, leader, cpu_map_idx); 2139 } 2140 2141 return cpu_map_idx; 2142 } 2143 2144 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) 2145 { 2146 struct evsel *leader = evsel__leader(evsel); 2147 int fd; 2148 2149 if (!evsel->supported || evsel__is_group_leader(evsel)) 2150 return -1; 2151 2152 /* 2153 * Leader must be already processed/open, 2154 * if not it's a bug. 2155 */ 2156 BUG_ON(!leader->core.fd); 2157 2158 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); 2159 if (cpu_map_idx == -1) 2160 return -1; 2161 2162 fd = FD(leader, cpu_map_idx, thread); 2163 BUG_ON(fd == -1 && leader->supported); 2164 2165 /* 2166 * When the leader has been skipped, return -2 to distinguish from no 2167 * group leader case. 2168 */ 2169 return fd == -1 ? -2 : fd; 2170 } 2171 2172 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx) 2173 { 2174 for (int cpu = 0; cpu < nr_cpus; cpu++) 2175 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 2176 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 2177 } 2178 2179 static int update_fds(struct evsel *evsel, 2180 int nr_cpus, int cpu_map_idx, 2181 int nr_threads, int thread_idx) 2182 { 2183 struct evsel *pos; 2184 2185 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) 2186 return -EINVAL; 2187 2188 evlist__for_each_entry(evsel->evlist, pos) { 2189 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; 2190 2191 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 2192 2193 /* 2194 * Since fds for next evsel has not been created, 2195 * there is no need to iterate whole event list. 2196 */ 2197 if (pos == evsel) 2198 break; 2199 } 2200 return 0; 2201 } 2202 2203 static bool evsel__ignore_missing_thread(struct evsel *evsel, 2204 int nr_cpus, int cpu_map_idx, 2205 struct perf_thread_map *threads, 2206 int thread, int err) 2207 { 2208 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 2209 2210 if (!evsel->ignore_missing_thread) 2211 return false; 2212 2213 /* The system wide setup does not work with threads. */ 2214 if (evsel->core.system_wide) 2215 return false; 2216 2217 /* The -ESRCH is perf event syscall errno for pid's not found. */ 2218 if (err != -ESRCH) 2219 return false; 2220 2221 /* If there's only one thread, let it fail. */ 2222 if (threads->nr == 1) 2223 return false; 2224 2225 /* 2226 * We should remove fd for missing_thread first 2227 * because thread_map__remove() will decrease threads->nr. 2228 */ 2229 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread)) 2230 return false; 2231 2232 if (thread_map__remove(threads, thread)) 2233 return false; 2234 2235 pr_warning("WARNING: Ignored open failure for pid %d\n", 2236 ignore_pid); 2237 return true; 2238 } 2239 2240 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 2241 void *priv __maybe_unused) 2242 { 2243 return fprintf(fp, " %-32s %s\n", name, val); 2244 } 2245 2246 static void display_attr(struct perf_event_attr *attr) 2247 { 2248 if (verbose >= 2 || debug_peo_args) { 2249 fprintf(stderr, "%.60s\n", graph_dotted_line); 2250 fprintf(stderr, "perf_event_attr:\n"); 2251 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 2252 fprintf(stderr, "%.60s\n", graph_dotted_line); 2253 } 2254 } 2255 2256 bool evsel__precise_ip_fallback(struct evsel *evsel) 2257 { 2258 /* Do not try less precise if not requested. */ 2259 if (!evsel->precise_max) 2260 return false; 2261 2262 /* 2263 * We tried all the precise_ip values, and it's 2264 * still failing, so leave it to standard fallback. 2265 */ 2266 if (!evsel->core.attr.precise_ip) { 2267 evsel->core.attr.precise_ip = evsel->precise_ip_original; 2268 return false; 2269 } 2270 2271 if (!evsel->precise_ip_original) 2272 evsel->precise_ip_original = evsel->core.attr.precise_ip; 2273 2274 evsel->core.attr.precise_ip--; 2275 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 2276 display_attr(&evsel->core.attr); 2277 return true; 2278 } 2279 2280 static struct perf_cpu_map *empty_cpu_map; 2281 static struct perf_thread_map *empty_thread_map; 2282 2283 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 2284 struct perf_thread_map *threads) 2285 { 2286 int ret = 0; 2287 int nthreads = perf_thread_map__nr(threads); 2288 2289 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 2290 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 2291 return -EINVAL; 2292 2293 if (cpus == NULL) { 2294 if (empty_cpu_map == NULL) { 2295 empty_cpu_map = perf_cpu_map__new_any_cpu(); 2296 if (empty_cpu_map == NULL) 2297 return -ENOMEM; 2298 } 2299 2300 cpus = empty_cpu_map; 2301 } 2302 2303 if (threads == NULL) { 2304 if (empty_thread_map == NULL) { 2305 empty_thread_map = thread_map__new_by_tid(-1); 2306 if (empty_thread_map == NULL) 2307 return -ENOMEM; 2308 } 2309 2310 threads = empty_thread_map; 2311 } 2312 2313 if (evsel->core.fd == NULL && 2314 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) 2315 return -ENOMEM; 2316 2317 if (evsel__is_tool(evsel)) 2318 ret = evsel__tool_pmu_prepare_open(evsel, cpus, nthreads); 2319 2320 evsel->open_flags = PERF_FLAG_FD_CLOEXEC; 2321 if (evsel->cgrp) 2322 evsel->open_flags |= PERF_FLAG_PID_CGROUP; 2323 2324 return ret; 2325 } 2326 2327 static void evsel__disable_missing_features(struct evsel *evsel) 2328 { 2329 if (perf_missing_features.defer_callchain && evsel->core.attr.defer_callchain) 2330 evsel->core.attr.defer_callchain = 0; 2331 if (perf_missing_features.defer_callchain && evsel->core.attr.defer_output) 2332 evsel->core.attr.defer_output = 0; 2333 if (perf_missing_features.inherit_sample_read && evsel->core.attr.inherit && 2334 (evsel->core.attr.sample_type & PERF_SAMPLE_READ)) 2335 evsel->core.attr.inherit = 0; 2336 if (perf_missing_features.branch_counters) 2337 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS; 2338 if (perf_missing_features.read_lost) 2339 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST; 2340 if (perf_missing_features.weight_struct) { 2341 evsel__set_sample_bit(evsel, WEIGHT); 2342 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT); 2343 } 2344 if (perf_missing_features.clockid_wrong) 2345 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 2346 if (perf_missing_features.clockid) { 2347 evsel->core.attr.use_clockid = 0; 2348 evsel->core.attr.clockid = 0; 2349 } 2350 if (perf_missing_features.cloexec) 2351 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 2352 if (perf_missing_features.mmap2) 2353 evsel->core.attr.mmap2 = 0; 2354 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest) 2355 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 2356 if (perf_missing_features.lbr_flags) 2357 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 2358 PERF_SAMPLE_BRANCH_NO_CYCLES); 2359 if (perf_missing_features.group_read && evsel->core.attr.inherit) 2360 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 2361 if (perf_missing_features.ksymbol) 2362 evsel->core.attr.ksymbol = 0; 2363 if (perf_missing_features.bpf) 2364 evsel->core.attr.bpf_event = 0; 2365 if (perf_missing_features.branch_hw_idx) 2366 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX; 2367 if (perf_missing_features.sample_id_all) 2368 evsel->core.attr.sample_id_all = 0; 2369 } 2370 2371 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 2372 struct perf_thread_map *threads) 2373 { 2374 int err; 2375 2376 err = __evsel__prepare_open(evsel, cpus, threads); 2377 if (err) 2378 return err; 2379 2380 evsel__disable_missing_features(evsel); 2381 2382 return err; 2383 } 2384 2385 static bool __has_attr_feature(struct perf_event_attr *attr, 2386 struct perf_cpu cpu, unsigned long flags) 2387 { 2388 int fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2389 /*group_fd=*/-1, flags); 2390 close(fd); 2391 2392 if (fd < 0) { 2393 attr->exclude_kernel = 1; 2394 2395 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2396 /*group_fd=*/-1, flags); 2397 close(fd); 2398 } 2399 2400 if (fd < 0) { 2401 attr->exclude_hv = 1; 2402 2403 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2404 /*group_fd=*/-1, flags); 2405 close(fd); 2406 } 2407 2408 if (fd < 0) { 2409 attr->exclude_guest = 1; 2410 2411 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu, 2412 /*group_fd=*/-1, flags); 2413 close(fd); 2414 } 2415 2416 attr->exclude_kernel = 0; 2417 attr->exclude_guest = 0; 2418 attr->exclude_hv = 0; 2419 2420 return fd >= 0; 2421 } 2422 2423 static bool has_attr_feature(struct perf_event_attr *attr, unsigned long flags) 2424 { 2425 struct perf_cpu cpu = {.cpu = -1}; 2426 2427 return __has_attr_feature(attr, cpu, flags); 2428 } 2429 2430 static void evsel__detect_missing_pmu_features(struct evsel *evsel) 2431 { 2432 struct perf_event_attr attr = { 2433 .type = evsel->core.attr.type, 2434 .config = evsel->core.attr.config, 2435 .disabled = 1, 2436 }; 2437 struct perf_pmu *pmu = evsel->pmu; 2438 int old_errno; 2439 2440 old_errno = errno; 2441 2442 if (pmu == NULL) 2443 pmu = evsel->pmu = evsel__find_pmu(evsel); 2444 2445 if (pmu == NULL || pmu->missing_features.checked) 2446 goto out; 2447 2448 /* 2449 * Must probe features in the order they were added to the 2450 * perf_event_attr interface. These are kernel core limitation but 2451 * specific to PMUs with branch stack. So we can detect with the given 2452 * hardware event and stop on the first one succeeded. 2453 */ 2454 2455 /* Please add new feature detection here. */ 2456 2457 attr.exclude_guest = 1; 2458 if (has_attr_feature(&attr, /*flags=*/0)) 2459 goto found; 2460 pmu->missing_features.exclude_guest = true; 2461 pr_debug2("switching off exclude_guest for PMU %s\n", pmu->name); 2462 2463 found: 2464 pmu->missing_features.checked = true; 2465 out: 2466 errno = old_errno; 2467 } 2468 2469 static void evsel__detect_missing_brstack_features(struct evsel *evsel) 2470 { 2471 static bool detection_done = false; 2472 struct perf_event_attr attr = { 2473 .type = evsel->core.attr.type, 2474 .config = evsel->core.attr.config, 2475 .disabled = 1, 2476 .sample_type = PERF_SAMPLE_BRANCH_STACK, 2477 .sample_period = 1000, 2478 }; 2479 int old_errno; 2480 2481 if (detection_done) 2482 return; 2483 2484 old_errno = errno; 2485 2486 /* 2487 * Must probe features in the order they were added to the 2488 * perf_event_attr interface. These are PMU specific limitation 2489 * so we can detect with the given hardware event and stop on the 2490 * first one succeeded. 2491 */ 2492 2493 /* Please add new feature detection here. */ 2494 2495 attr.branch_sample_type = PERF_SAMPLE_BRANCH_COUNTERS; 2496 if (has_attr_feature(&attr, /*flags=*/0)) 2497 goto found; 2498 perf_missing_features.branch_counters = true; 2499 pr_debug2("switching off branch counters support\n"); 2500 2501 attr.branch_sample_type = PERF_SAMPLE_BRANCH_HW_INDEX; 2502 if (has_attr_feature(&attr, /*flags=*/0)) 2503 goto found; 2504 perf_missing_features.branch_hw_idx = true; 2505 pr_debug2("switching off branch HW index support\n"); 2506 2507 attr.branch_sample_type = PERF_SAMPLE_BRANCH_NO_CYCLES | PERF_SAMPLE_BRANCH_NO_FLAGS; 2508 if (has_attr_feature(&attr, /*flags=*/0)) 2509 goto found; 2510 perf_missing_features.lbr_flags = true; 2511 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 2512 2513 found: 2514 detection_done = true; 2515 errno = old_errno; 2516 } 2517 2518 static bool evsel__probe_aux_action(struct evsel *evsel, struct perf_cpu cpu) 2519 { 2520 struct perf_event_attr attr = evsel->core.attr; 2521 int old_errno = errno; 2522 2523 attr.disabled = 1; 2524 attr.aux_start_paused = 1; 2525 2526 if (__has_attr_feature(&attr, cpu, /*flags=*/0)) { 2527 errno = old_errno; 2528 return true; 2529 } 2530 2531 /* 2532 * EOPNOTSUPP means the kernel supports the feature but the PMU does 2533 * not, so keep that distinction if possible. 2534 */ 2535 if (errno != EOPNOTSUPP) 2536 errno = old_errno; 2537 2538 return false; 2539 } 2540 2541 static void evsel__detect_missing_aux_action_feature(struct evsel *evsel, struct perf_cpu cpu) 2542 { 2543 static bool detection_done; 2544 struct evsel *leader; 2545 2546 /* 2547 * Don't bother probing aux_action if it is not being used or has been 2548 * probed before. 2549 */ 2550 if (!evsel->core.attr.aux_action || detection_done) 2551 return; 2552 2553 detection_done = true; 2554 2555 /* 2556 * The leader is an AUX area event. If it has failed, assume the feature 2557 * is not supported. 2558 */ 2559 leader = evsel__leader(evsel); 2560 if (evsel == leader) { 2561 perf_missing_features.aux_action = true; 2562 return; 2563 } 2564 2565 /* 2566 * AUX area event with aux_action must have been opened successfully 2567 * already, so feature is supported. 2568 */ 2569 if (leader->core.attr.aux_action) 2570 return; 2571 2572 if (!evsel__probe_aux_action(leader, cpu)) 2573 perf_missing_features.aux_action = true; 2574 } 2575 2576 static bool evsel__detect_missing_features(struct evsel *evsel, struct perf_cpu cpu) 2577 { 2578 static bool detection_done = false; 2579 struct perf_event_attr attr = { 2580 .type = PERF_TYPE_SOFTWARE, 2581 .config = PERF_COUNT_SW_TASK_CLOCK, 2582 .disabled = 1, 2583 }; 2584 int old_errno; 2585 2586 evsel__detect_missing_aux_action_feature(evsel, cpu); 2587 2588 evsel__detect_missing_pmu_features(evsel); 2589 2590 if (evsel__has_br_stack(evsel)) 2591 evsel__detect_missing_brstack_features(evsel); 2592 2593 if (detection_done) 2594 goto check; 2595 2596 old_errno = errno; 2597 2598 /* 2599 * Must probe features in the order they were added to the 2600 * perf_event_attr interface. These are kernel core limitation 2601 * not PMU-specific so we can detect with a software event and 2602 * stop on the first one succeeded. 2603 */ 2604 2605 /* Please add new feature detection here. */ 2606 2607 attr.defer_callchain = true; 2608 if (has_attr_feature(&attr, /*flags=*/0)) 2609 goto found; 2610 perf_missing_features.defer_callchain = true; 2611 pr_debug2("switching off deferred callchain support\n"); 2612 attr.defer_callchain = false; 2613 2614 attr.inherit = true; 2615 attr.sample_type = PERF_SAMPLE_READ | PERF_SAMPLE_TID; 2616 if (has_attr_feature(&attr, /*flags=*/0)) 2617 goto found; 2618 perf_missing_features.inherit_sample_read = true; 2619 pr_debug2("Using PERF_SAMPLE_READ / :S modifier is not compatible with inherit, falling back to no-inherit.\n"); 2620 attr.inherit = false; 2621 attr.sample_type = 0; 2622 2623 attr.read_format = PERF_FORMAT_LOST; 2624 if (has_attr_feature(&attr, /*flags=*/0)) 2625 goto found; 2626 perf_missing_features.read_lost = true; 2627 pr_debug2("switching off PERF_FORMAT_LOST support\n"); 2628 attr.read_format = 0; 2629 2630 attr.sample_type = PERF_SAMPLE_WEIGHT_STRUCT; 2631 if (has_attr_feature(&attr, /*flags=*/0)) 2632 goto found; 2633 perf_missing_features.weight_struct = true; 2634 pr_debug2("switching off weight struct support\n"); 2635 attr.sample_type = 0; 2636 2637 attr.sample_type = PERF_SAMPLE_CODE_PAGE_SIZE; 2638 if (has_attr_feature(&attr, /*flags=*/0)) 2639 goto found; 2640 perf_missing_features.code_page_size = true; 2641 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support\n"); 2642 attr.sample_type = 0; 2643 2644 attr.sample_type = PERF_SAMPLE_DATA_PAGE_SIZE; 2645 if (has_attr_feature(&attr, /*flags=*/0)) 2646 goto found; 2647 perf_missing_features.data_page_size = true; 2648 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support\n"); 2649 attr.sample_type = 0; 2650 2651 attr.cgroup = 1; 2652 if (has_attr_feature(&attr, /*flags=*/0)) 2653 goto found; 2654 perf_missing_features.cgroup = true; 2655 pr_debug2_peo("Kernel has no cgroup sampling support\n"); 2656 attr.cgroup = 0; 2657 2658 attr.aux_output = 1; 2659 if (has_attr_feature(&attr, /*flags=*/0)) 2660 goto found; 2661 perf_missing_features.aux_output = true; 2662 pr_debug2_peo("Kernel has no attr.aux_output support\n"); 2663 attr.aux_output = 0; 2664 2665 attr.bpf_event = 1; 2666 if (has_attr_feature(&attr, /*flags=*/0)) 2667 goto found; 2668 perf_missing_features.bpf = true; 2669 pr_debug2_peo("switching off bpf_event\n"); 2670 attr.bpf_event = 0; 2671 2672 attr.ksymbol = 1; 2673 if (has_attr_feature(&attr, /*flags=*/0)) 2674 goto found; 2675 perf_missing_features.ksymbol = true; 2676 pr_debug2_peo("switching off ksymbol\n"); 2677 attr.ksymbol = 0; 2678 2679 attr.write_backward = 1; 2680 if (has_attr_feature(&attr, /*flags=*/0)) 2681 goto found; 2682 perf_missing_features.write_backward = true; 2683 pr_debug2_peo("switching off write_backward\n"); 2684 attr.write_backward = 0; 2685 2686 attr.use_clockid = 1; 2687 attr.clockid = CLOCK_MONOTONIC; 2688 if (has_attr_feature(&attr, /*flags=*/0)) 2689 goto found; 2690 perf_missing_features.clockid = true; 2691 pr_debug2_peo("switching off clockid\n"); 2692 attr.use_clockid = 0; 2693 attr.clockid = 0; 2694 2695 if (has_attr_feature(&attr, /*flags=*/PERF_FLAG_FD_CLOEXEC)) 2696 goto found; 2697 perf_missing_features.cloexec = true; 2698 pr_debug2_peo("switching off cloexec flag\n"); 2699 2700 attr.mmap2 = 1; 2701 if (has_attr_feature(&attr, /*flags=*/0)) 2702 goto found; 2703 perf_missing_features.mmap2 = true; 2704 pr_debug2_peo("switching off mmap2\n"); 2705 attr.mmap2 = 0; 2706 2707 /* set this unconditionally? */ 2708 perf_missing_features.sample_id_all = true; 2709 pr_debug2_peo("switching off sample_id_all\n"); 2710 2711 attr.inherit = 1; 2712 attr.read_format = PERF_FORMAT_GROUP; 2713 if (has_attr_feature(&attr, /*flags=*/0)) 2714 goto found; 2715 perf_missing_features.group_read = true; 2716 pr_debug2_peo("switching off group read\n"); 2717 attr.inherit = 0; 2718 attr.read_format = 0; 2719 2720 found: 2721 detection_done = true; 2722 errno = old_errno; 2723 2724 check: 2725 if ((evsel->core.attr.defer_callchain || evsel->core.attr.defer_output) && 2726 perf_missing_features.defer_callchain) 2727 return true; 2728 2729 if (evsel->core.attr.inherit && 2730 (evsel->core.attr.sample_type & PERF_SAMPLE_READ) && 2731 perf_missing_features.inherit_sample_read) 2732 return true; 2733 2734 if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) && 2735 perf_missing_features.branch_counters) 2736 return true; 2737 2738 if ((evsel->core.attr.read_format & PERF_FORMAT_LOST) && 2739 perf_missing_features.read_lost) 2740 return true; 2741 2742 if ((evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT) && 2743 perf_missing_features.weight_struct) 2744 return true; 2745 2746 if (evsel->core.attr.use_clockid && evsel->core.attr.clockid != CLOCK_MONOTONIC && 2747 !perf_missing_features.clockid) { 2748 perf_missing_features.clockid_wrong = true; 2749 return true; 2750 } 2751 2752 if (evsel->core.attr.use_clockid && perf_missing_features.clockid) 2753 return true; 2754 2755 if ((evsel->open_flags & PERF_FLAG_FD_CLOEXEC) && 2756 perf_missing_features.cloexec) 2757 return true; 2758 2759 if (evsel->core.attr.mmap2 && perf_missing_features.mmap2) 2760 return true; 2761 2762 if ((evsel->core.attr.branch_sample_type & (PERF_SAMPLE_BRANCH_NO_FLAGS | 2763 PERF_SAMPLE_BRANCH_NO_CYCLES)) && 2764 perf_missing_features.lbr_flags) 2765 return true; 2766 2767 if (evsel->core.attr.inherit && (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 2768 perf_missing_features.group_read) 2769 return true; 2770 2771 if (evsel->core.attr.ksymbol && perf_missing_features.ksymbol) 2772 return true; 2773 2774 if (evsel->core.attr.bpf_event && perf_missing_features.bpf) 2775 return true; 2776 2777 if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX) && 2778 perf_missing_features.branch_hw_idx) 2779 return true; 2780 2781 if (evsel->core.attr.sample_id_all && perf_missing_features.sample_id_all) 2782 return true; 2783 2784 return false; 2785 } 2786 2787 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 2788 struct perf_thread_map *threads, 2789 int start_cpu_map_idx, int end_cpu_map_idx) 2790 { 2791 int idx, thread, nthreads; 2792 int pid = -1, err, old_errno; 2793 enum rlimit_action set_rlimit = NO_CHANGE; 2794 struct perf_cpu cpu; 2795 2796 if (evsel__is_retire_lat(evsel)) { 2797 err = evsel__tpebs_open(evsel); 2798 goto out; 2799 } 2800 2801 err = __evsel__prepare_open(evsel, cpus, threads); 2802 if (err) 2803 goto out; 2804 2805 if (cpus == NULL) 2806 cpus = empty_cpu_map; 2807 2808 if (threads == NULL) 2809 threads = empty_thread_map; 2810 2811 nthreads = perf_thread_map__nr(threads); 2812 2813 if (evsel->cgrp) 2814 pid = evsel->cgrp->fd; 2815 2816 fallback_missing_features: 2817 evsel__disable_missing_features(evsel); 2818 2819 pr_debug3("Opening: %s\n", evsel__name(evsel)); 2820 display_attr(&evsel->core.attr); 2821 2822 if (evsel__is_tool(evsel)) { 2823 err = evsel__tool_pmu_open(evsel, threads, 2824 start_cpu_map_idx, 2825 end_cpu_map_idx); 2826 goto out; 2827 } 2828 if (evsel__is_hwmon(evsel)) { 2829 err = evsel__hwmon_pmu_open(evsel, threads, 2830 start_cpu_map_idx, 2831 end_cpu_map_idx); 2832 goto out; 2833 } 2834 if (evsel__is_drm(evsel)) { 2835 err = evsel__drm_pmu_open(evsel, threads, 2836 start_cpu_map_idx, 2837 end_cpu_map_idx); 2838 goto out; 2839 } 2840 2841 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { 2842 cpu = perf_cpu_map__cpu(cpus, idx); 2843 2844 for (thread = 0; thread < nthreads; thread++) { 2845 int fd, group_fd; 2846 retry_open: 2847 if (thread >= nthreads) 2848 break; 2849 2850 if (!evsel->cgrp && !evsel->core.system_wide) 2851 pid = perf_thread_map__pid(threads, thread); 2852 2853 group_fd = get_group_fd(evsel, idx, thread); 2854 2855 if (group_fd == -2) { 2856 pr_debug("broken group leader for %s\n", evsel->name); 2857 err = -EINVAL; 2858 goto out_close; 2859 } 2860 2861 /* Debug message used by test scripts */ 2862 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 2863 pid, cpu.cpu, group_fd, evsel->open_flags); 2864 2865 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu.cpu, 2866 group_fd, evsel->open_flags); 2867 2868 FD(evsel, idx, thread) = fd; 2869 2870 if (fd < 0) { 2871 err = -errno; 2872 2873 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 2874 err); 2875 goto try_fallback; 2876 } 2877 2878 bpf_counter__install_pe(evsel, idx, fd); 2879 2880 if (unlikely(test_attr__enabled())) { 2881 test_attr__open(&evsel->core.attr, pid, cpu, 2882 fd, group_fd, evsel->open_flags); 2883 } 2884 2885 /* Debug message used by test scripts */ 2886 pr_debug2_peo(" = %d\n", fd); 2887 2888 if (evsel->bpf_fd >= 0) { 2889 int evt_fd = fd; 2890 int bpf_fd = evsel->bpf_fd; 2891 2892 err = ioctl(evt_fd, 2893 PERF_EVENT_IOC_SET_BPF, 2894 bpf_fd); 2895 if (err && errno != EEXIST) { 2896 pr_err("failed to attach bpf fd %d: %m\n", 2897 bpf_fd); 2898 err = -EINVAL; 2899 goto out_close; 2900 } 2901 } 2902 2903 set_rlimit = NO_CHANGE; 2904 2905 /* 2906 * If we succeeded but had to kill clockid, fail and 2907 * have evsel__open_strerror() print us a nice error. 2908 */ 2909 if (perf_missing_features.clockid || 2910 perf_missing_features.clockid_wrong) { 2911 err = -EINVAL; 2912 goto out_close; 2913 } 2914 } 2915 } 2916 2917 err = 0; 2918 goto out; 2919 2920 try_fallback: 2921 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), 2922 idx, threads, thread, err)) { 2923 /* We just removed 1 thread, so lower the upper nthreads limit. */ 2924 nthreads--; 2925 2926 /* ... and pretend like nothing have happened. */ 2927 err = 0; 2928 goto retry_open; 2929 } 2930 /* 2931 * perf stat needs between 5 and 22 fds per CPU. When we run out 2932 * of them try to increase the limits. 2933 */ 2934 if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit)) 2935 goto retry_open; 2936 2937 if (err == -EINVAL && evsel__detect_missing_features(evsel, cpu)) 2938 goto fallback_missing_features; 2939 2940 if (evsel__precise_ip_fallback(evsel)) 2941 goto retry_open; 2942 2943 out_close: 2944 if (err) 2945 threads->err_thread = thread; 2946 2947 old_errno = errno; 2948 do { 2949 while (--thread >= 0) { 2950 if (FD(evsel, idx, thread) >= 0) 2951 close(FD(evsel, idx, thread)); 2952 FD(evsel, idx, thread) = -1; 2953 } 2954 thread = nthreads; 2955 } while (--idx >= 0); 2956 errno = old_errno; 2957 out: 2958 if (err) 2959 evsel->supported = false; 2960 return err; 2961 } 2962 2963 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 2964 struct perf_thread_map *threads) 2965 { 2966 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2967 } 2968 2969 void evsel__close(struct evsel *evsel) 2970 { 2971 if (evsel__is_retire_lat(evsel)) 2972 evsel__tpebs_close(evsel); 2973 perf_evsel__close(&evsel->core); 2974 perf_evsel__free_id(&evsel->core); 2975 } 2976 2977 int evsel__open_per_cpu_and_thread(struct evsel *evsel, 2978 struct perf_cpu_map *cpus, int cpu_map_idx, 2979 struct perf_thread_map *threads) 2980 { 2981 if (cpu_map_idx == -1) 2982 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2983 2984 return evsel__open_cpu(evsel, cpus, threads, cpu_map_idx, cpu_map_idx + 1); 2985 } 2986 2987 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx) 2988 { 2989 struct perf_thread_map *threads = thread_map__new_by_tid(-1); 2990 int ret = evsel__open_per_cpu_and_thread(evsel, cpus, cpu_map_idx, threads); 2991 2992 perf_thread_map__put(threads); 2993 return ret; 2994 } 2995 2996 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 2997 { 2998 struct perf_cpu_map *cpus = perf_cpu_map__new_any_cpu(); 2999 int ret = evsel__open_per_cpu_and_thread(evsel, cpus, -1, threads); 3000 3001 perf_cpu_map__put(cpus); 3002 return ret; 3003 } 3004 3005 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 3006 const union perf_event *event, 3007 struct perf_sample *sample) 3008 { 3009 u64 type = evsel->core.attr.sample_type; 3010 const __u64 *array = event->sample.array; 3011 bool swapped = evsel->needs_swap; 3012 union u64_swap u; 3013 3014 array += ((event->header.size - 3015 sizeof(event->header)) / sizeof(u64)) - 1; 3016 3017 if (type & PERF_SAMPLE_IDENTIFIER) { 3018 sample->id = *array; 3019 array--; 3020 } 3021 3022 if (type & PERF_SAMPLE_CPU) { 3023 u.val64 = *array; 3024 if (swapped) { 3025 /* undo swap of u64, then swap on individual u32s */ 3026 u.val64 = bswap_64(u.val64); 3027 u.val32[0] = bswap_32(u.val32[0]); 3028 } 3029 3030 sample->cpu = u.val32[0]; 3031 array--; 3032 } 3033 3034 if (type & PERF_SAMPLE_STREAM_ID) { 3035 sample->stream_id = *array; 3036 array--; 3037 } 3038 3039 if (type & PERF_SAMPLE_ID) { 3040 sample->id = *array; 3041 array--; 3042 } 3043 3044 if (type & PERF_SAMPLE_TIME) { 3045 sample->time = *array; 3046 array--; 3047 } 3048 3049 if (type & PERF_SAMPLE_TID) { 3050 u.val64 = *array; 3051 if (swapped) { 3052 /* undo swap of u64, then swap on individual u32s */ 3053 u.val64 = bswap_64(u.val64); 3054 u.val32[0] = bswap_32(u.val32[0]); 3055 u.val32[1] = bswap_32(u.val32[1]); 3056 } 3057 3058 sample->pid = u.val32[0]; 3059 sample->tid = u.val32[1]; 3060 array--; 3061 } 3062 3063 return 0; 3064 } 3065 3066 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 3067 u64 size) 3068 { 3069 return size > max_size || offset + size > endp; 3070 } 3071 3072 #define OVERFLOW_CHECK(offset, size, max_size) \ 3073 do { \ 3074 if (overflow(endp, (max_size), (offset), (size))) \ 3075 return -EFAULT; \ 3076 } while (0) 3077 3078 #define OVERFLOW_CHECK_u64(offset) \ 3079 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 3080 3081 static int 3082 perf_event__check_size(union perf_event *event, unsigned int sample_size) 3083 { 3084 /* 3085 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 3086 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 3087 * check the format does not go past the end of the event. 3088 */ 3089 if (sample_size + sizeof(event->header) > event->header.size) 3090 return -EFAULT; 3091 3092 return 0; 3093 } 3094 3095 static void perf_parse_sample_weight(struct perf_sample *data, const __u64 *array, u64 type) 3096 { 3097 union perf_sample_weight weight; 3098 3099 weight.full = *array; 3100 if (type & PERF_SAMPLE_WEIGHT_STRUCT) { 3101 data->weight = weight.var1_dw; 3102 data->ins_lat = weight.var2_w; 3103 data->weight3 = weight.var3_w; 3104 } else { 3105 data->weight = weight.full; 3106 } 3107 } 3108 3109 u64 evsel__bitfield_swap_branch_flags(u64 value) 3110 { 3111 u64 new_val = 0; 3112 3113 /* 3114 * branch_flags 3115 * union { 3116 * u64 values; 3117 * struct { 3118 * mispred:1 //target mispredicted 3119 * predicted:1 //target predicted 3120 * in_tx:1 //in transaction 3121 * abort:1 //transaction abort 3122 * cycles:16 //cycle count to last branch 3123 * type:4 //branch type 3124 * spec:2 //branch speculation info 3125 * new_type:4 //additional branch type 3126 * priv:3 //privilege level 3127 * reserved:31 3128 * } 3129 * } 3130 * 3131 * Avoid bswap64() the entire branch_flag.value, 3132 * as it has variable bit-field sizes. Instead the 3133 * macro takes the bit-field position/size, 3134 * swaps it based on the host endianness. 3135 */ 3136 if (host_is_bigendian()) { 3137 new_val = bitfield_swap(value, 0, 1); 3138 new_val |= bitfield_swap(value, 1, 1); 3139 new_val |= bitfield_swap(value, 2, 1); 3140 new_val |= bitfield_swap(value, 3, 1); 3141 new_val |= bitfield_swap(value, 4, 16); 3142 new_val |= bitfield_swap(value, 20, 4); 3143 new_val |= bitfield_swap(value, 24, 2); 3144 new_val |= bitfield_swap(value, 26, 4); 3145 new_val |= bitfield_swap(value, 30, 3); 3146 new_val |= bitfield_swap(value, 33, 31); 3147 } else { 3148 new_val = bitfield_swap(value, 63, 1); 3149 new_val |= bitfield_swap(value, 62, 1); 3150 new_val |= bitfield_swap(value, 61, 1); 3151 new_val |= bitfield_swap(value, 60, 1); 3152 new_val |= bitfield_swap(value, 44, 16); 3153 new_val |= bitfield_swap(value, 40, 4); 3154 new_val |= bitfield_swap(value, 38, 2); 3155 new_val |= bitfield_swap(value, 34, 4); 3156 new_val |= bitfield_swap(value, 31, 3); 3157 new_val |= bitfield_swap(value, 0, 31); 3158 } 3159 3160 return new_val; 3161 } 3162 3163 static inline bool evsel__has_branch_counters(const struct evsel *evsel) 3164 { 3165 struct evsel *leader = evsel__leader(evsel); 3166 3167 /* The branch counters feature only supports group */ 3168 if (!leader || !evsel->evlist) 3169 return false; 3170 3171 if (evsel->evlist->nr_br_cntr < 0) 3172 evlist__update_br_cntr(evsel->evlist); 3173 3174 if (leader->br_cntr_nr > 0) 3175 return true; 3176 3177 return false; 3178 } 3179 3180 static int __set_offcpu_sample(struct perf_sample *data) 3181 { 3182 u64 *array = data->raw_data; 3183 u32 max_size = data->raw_size, *p32; 3184 const void *endp = (void *)array + max_size; 3185 3186 if (array == NULL) 3187 return -EFAULT; 3188 3189 OVERFLOW_CHECK_u64(array); 3190 p32 = (void *)array++; 3191 data->pid = p32[0]; 3192 data->tid = p32[1]; 3193 3194 OVERFLOW_CHECK_u64(array); 3195 data->period = *array++; 3196 3197 OVERFLOW_CHECK_u64(array); 3198 data->callchain = (struct ip_callchain *)array++; 3199 OVERFLOW_CHECK(array, data->callchain->nr * sizeof(u64), max_size); 3200 data->ip = data->callchain->ips[1]; 3201 array += data->callchain->nr; 3202 3203 OVERFLOW_CHECK_u64(array); 3204 data->cgroup = *array; 3205 3206 return 0; 3207 } 3208 3209 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 3210 struct perf_sample *data) 3211 { 3212 u64 type = evsel->core.attr.sample_type; 3213 bool swapped = evsel->needs_swap; 3214 const __u64 *array; 3215 u16 max_size = event->header.size; 3216 const void *endp = (void *)event + max_size; 3217 u64 sz; 3218 3219 /* 3220 * used for cross-endian analysis. See git commit 65014ab3 3221 * for why this goofiness is needed. 3222 */ 3223 union u64_swap u; 3224 3225 memset(data, 0, sizeof(*data)); 3226 data->cpu = data->pid = data->tid = -1; 3227 data->stream_id = data->id = data->time = -1ULL; 3228 data->period = evsel->core.attr.sample_period; 3229 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 3230 data->misc = event->header.misc; 3231 data->data_src = PERF_MEM_DATA_SRC_NONE; 3232 data->vcpu = -1; 3233 3234 if (event->header.type == PERF_RECORD_CALLCHAIN_DEFERRED) { 3235 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 3236 3237 data->callchain = (struct ip_callchain *)&event->callchain_deferred.nr; 3238 if (data->callchain->nr > max_callchain_nr) 3239 return -EFAULT; 3240 3241 data->deferred_cookie = event->callchain_deferred.cookie; 3242 3243 if (evsel->core.attr.sample_id_all) 3244 perf_evsel__parse_id_sample(evsel, event, data); 3245 return 0; 3246 } 3247 3248 if (event->header.type != PERF_RECORD_SAMPLE) { 3249 if (!evsel->core.attr.sample_id_all) 3250 return 0; 3251 return perf_evsel__parse_id_sample(evsel, event, data); 3252 } 3253 3254 array = event->sample.array; 3255 3256 if (perf_event__check_size(event, evsel->sample_size)) 3257 return -EFAULT; 3258 3259 if (type & PERF_SAMPLE_IDENTIFIER) { 3260 data->id = *array; 3261 array++; 3262 } 3263 3264 if (type & PERF_SAMPLE_IP) { 3265 data->ip = *array; 3266 array++; 3267 } 3268 3269 if (type & PERF_SAMPLE_TID) { 3270 u.val64 = *array; 3271 if (swapped) { 3272 /* undo swap of u64, then swap on individual u32s */ 3273 u.val64 = bswap_64(u.val64); 3274 u.val32[0] = bswap_32(u.val32[0]); 3275 u.val32[1] = bswap_32(u.val32[1]); 3276 } 3277 3278 data->pid = u.val32[0]; 3279 data->tid = u.val32[1]; 3280 array++; 3281 } 3282 3283 if (type & PERF_SAMPLE_TIME) { 3284 data->time = *array; 3285 array++; 3286 } 3287 3288 if (type & PERF_SAMPLE_ADDR) { 3289 data->addr = *array; 3290 array++; 3291 } 3292 3293 if (type & PERF_SAMPLE_ID) { 3294 data->id = *array; 3295 array++; 3296 } 3297 3298 if (type & PERF_SAMPLE_STREAM_ID) { 3299 data->stream_id = *array; 3300 array++; 3301 } 3302 3303 if (type & PERF_SAMPLE_CPU) { 3304 3305 u.val64 = *array; 3306 if (swapped) { 3307 /* undo swap of u64, then swap on individual u32s */ 3308 u.val64 = bswap_64(u.val64); 3309 u.val32[0] = bswap_32(u.val32[0]); 3310 } 3311 3312 data->cpu = u.val32[0]; 3313 array++; 3314 } 3315 3316 if (type & PERF_SAMPLE_PERIOD) { 3317 data->period = *array; 3318 array++; 3319 } 3320 3321 if (type & PERF_SAMPLE_READ) { 3322 u64 read_format = evsel->core.attr.read_format; 3323 3324 OVERFLOW_CHECK_u64(array); 3325 if (read_format & PERF_FORMAT_GROUP) 3326 data->read.group.nr = *array; 3327 else 3328 data->read.one.value = *array; 3329 3330 array++; 3331 3332 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 3333 OVERFLOW_CHECK_u64(array); 3334 data->read.time_enabled = *array; 3335 array++; 3336 } 3337 3338 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 3339 OVERFLOW_CHECK_u64(array); 3340 data->read.time_running = *array; 3341 array++; 3342 } 3343 3344 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 3345 if (read_format & PERF_FORMAT_GROUP) { 3346 const u64 max_group_nr = UINT64_MAX / 3347 sizeof(struct sample_read_value); 3348 3349 if (data->read.group.nr > max_group_nr) 3350 return -EFAULT; 3351 3352 sz = data->read.group.nr * sample_read_value_size(read_format); 3353 OVERFLOW_CHECK(array, sz, max_size); 3354 data->read.group.values = 3355 (struct sample_read_value *)array; 3356 array = (void *)array + sz; 3357 } else { 3358 OVERFLOW_CHECK_u64(array); 3359 data->read.one.id = *array; 3360 array++; 3361 3362 if (read_format & PERF_FORMAT_LOST) { 3363 OVERFLOW_CHECK_u64(array); 3364 data->read.one.lost = *array; 3365 array++; 3366 } 3367 } 3368 } 3369 3370 if (type & PERF_SAMPLE_CALLCHAIN) { 3371 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 3372 u64 callchain_nr; 3373 3374 OVERFLOW_CHECK_u64(array); 3375 data->callchain = (struct ip_callchain *)array++; 3376 callchain_nr = data->callchain->nr; 3377 if (callchain_nr > max_callchain_nr) 3378 return -EFAULT; 3379 sz = callchain_nr * sizeof(u64); 3380 /* 3381 * Save the cookie for the deferred user callchain. The last 2 3382 * entries in the callchain should be the context marker and the 3383 * cookie. The cookie will be used to match PERF_RECORD_ 3384 * CALLCHAIN_DEFERRED later. 3385 */ 3386 if (evsel->core.attr.defer_callchain && callchain_nr >= 2 && 3387 data->callchain->ips[callchain_nr - 2] == PERF_CONTEXT_USER_DEFERRED) { 3388 data->deferred_cookie = data->callchain->ips[callchain_nr - 1]; 3389 data->deferred_callchain = true; 3390 } 3391 OVERFLOW_CHECK(array, sz, max_size); 3392 array = (void *)array + sz; 3393 } 3394 3395 if (type & PERF_SAMPLE_RAW) { 3396 OVERFLOW_CHECK_u64(array); 3397 u.val64 = *array; 3398 3399 /* 3400 * Undo swap of u64, then swap on individual u32s, 3401 * get the size of the raw area and undo all of the 3402 * swap. The pevent interface handles endianness by 3403 * itself. 3404 */ 3405 if (swapped) { 3406 u.val64 = bswap_64(u.val64); 3407 u.val32[0] = bswap_32(u.val32[0]); 3408 u.val32[1] = bswap_32(u.val32[1]); 3409 } 3410 data->raw_size = u.val32[0]; 3411 3412 /* 3413 * The raw data is aligned on 64bits including the 3414 * u32 size, so it's safe to use mem_bswap_64. 3415 */ 3416 if (swapped) 3417 mem_bswap_64((void *) array, data->raw_size); 3418 3419 array = (void *)array + sizeof(u32); 3420 3421 OVERFLOW_CHECK(array, data->raw_size, max_size); 3422 data->raw_data = (void *)array; 3423 array = (void *)array + data->raw_size; 3424 } 3425 3426 if (type & PERF_SAMPLE_BRANCH_STACK) { 3427 const u64 max_branch_nr = UINT64_MAX / 3428 sizeof(struct branch_entry); 3429 struct branch_entry *e; 3430 unsigned int i; 3431 3432 OVERFLOW_CHECK_u64(array); 3433 data->branch_stack = (struct branch_stack *)array++; 3434 3435 if (data->branch_stack->nr > max_branch_nr) 3436 return -EFAULT; 3437 3438 sz = data->branch_stack->nr * sizeof(struct branch_entry); 3439 if (evsel__has_branch_hw_idx(evsel)) { 3440 sz += sizeof(u64); 3441 e = &data->branch_stack->entries[0]; 3442 } else { 3443 data->no_hw_idx = true; 3444 /* 3445 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, 3446 * only nr and entries[] will be output by kernel. 3447 */ 3448 e = (struct branch_entry *)&data->branch_stack->hw_idx; 3449 } 3450 3451 if (swapped) { 3452 /* 3453 * struct branch_flag does not have endian 3454 * specific bit field definition. And bswap 3455 * will not resolve the issue, since these 3456 * are bit fields. 3457 * 3458 * evsel__bitfield_swap_branch_flags() uses a 3459 * bitfield_swap macro to swap the bit position 3460 * based on the host endians. 3461 */ 3462 for (i = 0; i < data->branch_stack->nr; i++, e++) 3463 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); 3464 } 3465 3466 OVERFLOW_CHECK(array, sz, max_size); 3467 array = (void *)array + sz; 3468 3469 if (evsel__has_branch_counters(evsel)) { 3470 data->branch_stack_cntr = (u64 *)array; 3471 sz = data->branch_stack->nr * sizeof(u64); 3472 3473 OVERFLOW_CHECK(array, sz, max_size); 3474 array = (void *)array + sz; 3475 } 3476 } 3477 3478 if (type & PERF_SAMPLE_REGS_USER) { 3479 struct regs_dump *regs = perf_sample__user_regs(data); 3480 3481 OVERFLOW_CHECK_u64(array); 3482 regs->abi = *array; 3483 array++; 3484 3485 if (regs->abi) { 3486 u64 mask = evsel->core.attr.sample_regs_user; 3487 3488 sz = hweight64(mask) * sizeof(u64); 3489 OVERFLOW_CHECK(array, sz, max_size); 3490 regs->mask = mask; 3491 regs->regs = (u64 *)array; 3492 array = (void *)array + sz; 3493 } 3494 } 3495 3496 if (type & PERF_SAMPLE_STACK_USER) { 3497 OVERFLOW_CHECK_u64(array); 3498 sz = *array++; 3499 3500 data->user_stack.offset = ((char *)(array - 1) 3501 - (char *) event); 3502 3503 if (!sz) { 3504 data->user_stack.size = 0; 3505 } else { 3506 OVERFLOW_CHECK(array, sz, max_size); 3507 data->user_stack.data = (char *)array; 3508 array = (void *)array + sz; 3509 OVERFLOW_CHECK_u64(array); 3510 data->user_stack.size = *array++; 3511 if (WARN_ONCE(data->user_stack.size > sz, 3512 "user stack dump failure\n")) 3513 return -EFAULT; 3514 } 3515 } 3516 3517 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 3518 OVERFLOW_CHECK_u64(array); 3519 perf_parse_sample_weight(data, array, type); 3520 array++; 3521 } 3522 3523 if (type & PERF_SAMPLE_DATA_SRC) { 3524 OVERFLOW_CHECK_u64(array); 3525 data->data_src = *array; 3526 array++; 3527 } 3528 3529 if (type & PERF_SAMPLE_TRANSACTION) { 3530 OVERFLOW_CHECK_u64(array); 3531 data->transaction = *array; 3532 array++; 3533 } 3534 3535 if (type & PERF_SAMPLE_REGS_INTR) { 3536 struct regs_dump *regs = perf_sample__intr_regs(data); 3537 3538 OVERFLOW_CHECK_u64(array); 3539 regs->abi = *array; 3540 array++; 3541 3542 if (regs->abi != PERF_SAMPLE_REGS_ABI_NONE) { 3543 u64 mask = evsel->core.attr.sample_regs_intr; 3544 3545 sz = hweight64(mask) * sizeof(u64); 3546 OVERFLOW_CHECK(array, sz, max_size); 3547 regs->mask = mask; 3548 regs->regs = (u64 *)array; 3549 array = (void *)array + sz; 3550 } 3551 } 3552 3553 data->phys_addr = 0; 3554 if (type & PERF_SAMPLE_PHYS_ADDR) { 3555 data->phys_addr = *array; 3556 array++; 3557 } 3558 3559 data->cgroup = 0; 3560 if (type & PERF_SAMPLE_CGROUP) { 3561 data->cgroup = *array; 3562 array++; 3563 } 3564 3565 data->data_page_size = 0; 3566 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 3567 data->data_page_size = *array; 3568 array++; 3569 } 3570 3571 data->code_page_size = 0; 3572 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 3573 data->code_page_size = *array; 3574 array++; 3575 } 3576 3577 if (type & PERF_SAMPLE_AUX) { 3578 OVERFLOW_CHECK_u64(array); 3579 sz = *array++; 3580 3581 OVERFLOW_CHECK(array, sz, max_size); 3582 /* Undo swap of data */ 3583 if (swapped) 3584 mem_bswap_64((char *)array, sz); 3585 data->aux_sample.size = sz; 3586 data->aux_sample.data = (char *)array; 3587 array = (void *)array + sz; 3588 } 3589 3590 if (evsel__is_offcpu_event(evsel)) 3591 return __set_offcpu_sample(data); 3592 3593 return 0; 3594 } 3595 3596 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 3597 u64 *timestamp) 3598 { 3599 u64 type = evsel->core.attr.sample_type; 3600 const __u64 *array; 3601 3602 if (!(type & PERF_SAMPLE_TIME)) 3603 return -1; 3604 3605 if (event->header.type != PERF_RECORD_SAMPLE) { 3606 struct perf_sample data = { 3607 .time = -1ULL, 3608 }; 3609 3610 if (!evsel->core.attr.sample_id_all) 3611 return -1; 3612 if (perf_evsel__parse_id_sample(evsel, event, &data)) 3613 return -1; 3614 3615 *timestamp = data.time; 3616 return 0; 3617 } 3618 3619 array = event->sample.array; 3620 3621 if (perf_event__check_size(event, evsel->sample_size)) 3622 return -EFAULT; 3623 3624 if (type & PERF_SAMPLE_IDENTIFIER) 3625 array++; 3626 3627 if (type & PERF_SAMPLE_IP) 3628 array++; 3629 3630 if (type & PERF_SAMPLE_TID) 3631 array++; 3632 3633 if (type & PERF_SAMPLE_TIME) 3634 *timestamp = *array; 3635 3636 return 0; 3637 } 3638 3639 u16 evsel__id_hdr_size(const struct evsel *evsel) 3640 { 3641 u64 sample_type = evsel->core.attr.sample_type; 3642 u16 size = 0; 3643 3644 if (sample_type & PERF_SAMPLE_TID) 3645 size += sizeof(u64); 3646 3647 if (sample_type & PERF_SAMPLE_TIME) 3648 size += sizeof(u64); 3649 3650 if (sample_type & PERF_SAMPLE_ID) 3651 size += sizeof(u64); 3652 3653 if (sample_type & PERF_SAMPLE_STREAM_ID) 3654 size += sizeof(u64); 3655 3656 if (sample_type & PERF_SAMPLE_CPU) 3657 size += sizeof(u64); 3658 3659 if (sample_type & PERF_SAMPLE_IDENTIFIER) 3660 size += sizeof(u64); 3661 3662 return size; 3663 } 3664 3665 #ifdef HAVE_LIBTRACEEVENT 3666 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 3667 { 3668 struct tep_event *tp_format = evsel__tp_format(evsel); 3669 3670 return tp_format ? tep_find_field(tp_format, name) : NULL; 3671 } 3672 3673 struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name) 3674 { 3675 struct tep_event *tp_format = evsel__tp_format(evsel); 3676 3677 return tp_format ? tep_find_common_field(tp_format, name) : NULL; 3678 } 3679 3680 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 3681 { 3682 struct tep_format_field *field = evsel__field(evsel, name); 3683 int offset; 3684 3685 if (!field) 3686 return NULL; 3687 3688 offset = field->offset; 3689 3690 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 3691 offset = *(int *)(sample->raw_data + field->offset); 3692 offset &= 0xffff; 3693 if (tep_field_is_relative(field->flags)) 3694 offset += field->offset + field->size; 3695 } 3696 3697 return sample->raw_data + offset; 3698 } 3699 3700 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 3701 bool needs_swap) 3702 { 3703 u64 value; 3704 void *ptr = sample->raw_data + field->offset; 3705 3706 switch (field->size) { 3707 case 1: 3708 return *(u8 *)ptr; 3709 case 2: 3710 value = *(u16 *)ptr; 3711 break; 3712 case 4: 3713 value = *(u32 *)ptr; 3714 break; 3715 case 8: 3716 memcpy(&value, ptr, sizeof(u64)); 3717 break; 3718 default: 3719 return 0; 3720 } 3721 3722 if (!needs_swap) 3723 return value; 3724 3725 switch (field->size) { 3726 case 2: 3727 return bswap_16(value); 3728 case 4: 3729 return bswap_32(value); 3730 case 8: 3731 return bswap_64(value); 3732 default: 3733 return 0; 3734 } 3735 3736 return 0; 3737 } 3738 3739 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 3740 { 3741 struct tep_format_field *field = evsel__field(evsel, name); 3742 3743 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 3744 } 3745 3746 u64 evsel__intval_common(struct evsel *evsel, struct perf_sample *sample, const char *name) 3747 { 3748 struct tep_format_field *field = evsel__common_field(evsel, name); 3749 3750 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 3751 } 3752 3753 char evsel__taskstate(struct evsel *evsel, struct perf_sample *sample, const char *name) 3754 { 3755 static struct tep_format_field *prev_state_field; 3756 static const char *states; 3757 struct tep_format_field *field; 3758 unsigned long long val; 3759 unsigned int bit; 3760 char state = '?'; /* '?' denotes unknown task state */ 3761 3762 field = evsel__field(evsel, name); 3763 3764 if (!field) 3765 return state; 3766 3767 if (!states || field != prev_state_field) { 3768 states = parse_task_states(field); 3769 if (!states) 3770 return state; 3771 prev_state_field = field; 3772 } 3773 3774 /* 3775 * Note since the kernel exposes TASK_REPORT_MAX to userspace 3776 * to denote the 'preempted' state, we might as welll report 3777 * 'R' for this case, which make senses to users as well. 3778 * 3779 * We can change this if we have a good reason in the future. 3780 */ 3781 val = evsel__intval(evsel, sample, name); 3782 bit = val ? ffs(val) : 0; 3783 state = (!bit || bit > strlen(states)) ? 'R' : states[bit-1]; 3784 return state; 3785 } 3786 #endif 3787 3788 bool evsel__fallback(struct evsel *evsel, struct target *target, int err, 3789 char *msg, size_t msgsize) 3790 { 3791 int paranoid; 3792 3793 if ((err == ENODEV || err == ENOENT || err == ENXIO) && 3794 evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) { 3795 /* 3796 * If it's the legacy hardware cycles event fails then fall back 3797 * to hrtimer based cpu-clock sw counter, which is always 3798 * available even if no PMU support. PPC returned ENXIO rather 3799 * than ENODEV or ENOENT until 2.6.37. 3800 */ 3801 evsel->pmu = perf_pmus__find_by_type(PERF_TYPE_SOFTWARE); 3802 assert(evsel->pmu); /* software is a "well-known" and can't fail PMU type. */ 3803 3804 /* Configure the event. */ 3805 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 3806 evsel->core.attr.config = target__has_cpu(target) 3807 ? PERF_COUNT_SW_CPU_CLOCK 3808 : PERF_COUNT_SW_TASK_CLOCK; 3809 evsel->core.is_pmu_core = false; 3810 3811 /* Remove excludes for new event. */ 3812 if (evsel->fallenback_eacces) { 3813 evsel->core.attr.exclude_kernel = 0; 3814 evsel->core.attr.exclude_hv = 0; 3815 evsel->fallenback_eacces = false; 3816 } 3817 if (evsel->fallenback_eopnotsupp) { 3818 evsel->core.attr.exclude_guest = 0; 3819 evsel->fallenback_eopnotsupp = false; 3820 } 3821 3822 /* Name is recomputed by evsel__name. */ 3823 zfree(&evsel->name); 3824 3825 /* Log message. */ 3826 scnprintf(msg, msgsize, 3827 "The cycles event is not supported, trying to fall back to %s", 3828 evsel__name(evsel)); 3829 return true; 3830 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 3831 (paranoid = perf_event_paranoid()) > 1) { 3832 const char *name = evsel__name(evsel); 3833 char *new_name; 3834 const char *sep = ":"; 3835 3836 /* If event has exclude user then don't exclude kernel. */ 3837 if (evsel->core.attr.exclude_user) 3838 goto no_fallback; 3839 3840 /* Is there already the separator in the name. */ 3841 if (strchr(name, '/') || 3842 (strchr(name, ':') && !evsel->is_libpfm_event)) 3843 sep = ""; 3844 3845 if (asprintf(&new_name, "%s%su", name, sep) < 0) 3846 goto no_fallback; 3847 3848 free(evsel->name); 3849 evsel->name = new_name; 3850 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 3851 "to fall back to excluding kernel and hypervisor " 3852 " samples", paranoid); 3853 evsel->core.attr.exclude_kernel = 1; 3854 evsel->core.attr.exclude_hv = 1; 3855 evsel->fallenback_eacces = true; 3856 return true; 3857 } else if (err == EOPNOTSUPP && !evsel->core.attr.exclude_guest && 3858 !evsel->exclude_GH) { 3859 const char *name = evsel__name(evsel); 3860 char *new_name; 3861 const char *sep = ":"; 3862 3863 /* Is there already the separator in the name. */ 3864 if (strchr(name, '/') || 3865 (strchr(name, ':') && !evsel->is_libpfm_event)) 3866 sep = ""; 3867 3868 if (asprintf(&new_name, "%s%sH", name, sep) < 0) 3869 goto no_fallback; 3870 3871 free(evsel->name); 3872 evsel->name = new_name; 3873 /* Apple M1 requires exclude_guest */ 3874 scnprintf(msg, msgsize, "Trying to fall back to excluding guest samples"); 3875 evsel->core.attr.exclude_guest = 1; 3876 evsel->fallenback_eopnotsupp = true; 3877 return true; 3878 } 3879 no_fallback: 3880 scnprintf(msg, msgsize, "No fallback found for '%s' for error %d", 3881 evsel__name(evsel), err); 3882 return false; 3883 } 3884 3885 static bool find_process(const char *name) 3886 { 3887 size_t len = strlen(name); 3888 DIR *dir; 3889 struct dirent *d; 3890 int ret = -1; 3891 3892 dir = opendir(procfs__mountpoint()); 3893 if (!dir) 3894 return false; 3895 3896 /* Walk through the directory. */ 3897 while (ret && (d = readdir(dir)) != NULL) { 3898 char path[PATH_MAX]; 3899 char *data; 3900 size_t size; 3901 3902 if ((d->d_type != DT_DIR) || 3903 !strcmp(".", d->d_name) || 3904 !strcmp("..", d->d_name)) 3905 continue; 3906 3907 scnprintf(path, sizeof(path), "%s/%s/comm", 3908 procfs__mountpoint(), d->d_name); 3909 3910 if (filename__read_str(path, &data, &size)) 3911 continue; 3912 3913 ret = strncmp(name, data, len); 3914 free(data); 3915 } 3916 3917 closedir(dir); 3918 return ret ? false : true; 3919 } 3920 3921 static int dump_perf_event_processes(char *msg, size_t size) 3922 { 3923 DIR *proc_dir; 3924 struct dirent *proc_entry; 3925 int printed = 0; 3926 3927 proc_dir = opendir(procfs__mountpoint()); 3928 if (!proc_dir) 3929 return 0; 3930 3931 /* Walk through the /proc directory. */ 3932 while ((proc_entry = readdir(proc_dir)) != NULL) { 3933 char buf[256]; 3934 DIR *fd_dir; 3935 struct dirent *fd_entry; 3936 int fd_dir_fd; 3937 3938 if (proc_entry->d_type != DT_DIR || 3939 !isdigit(proc_entry->d_name[0]) || 3940 strlen(proc_entry->d_name) > sizeof(buf) - 4) 3941 continue; 3942 3943 scnprintf(buf, sizeof(buf), "%s/fd", proc_entry->d_name); 3944 fd_dir_fd = openat(dirfd(proc_dir), buf, O_DIRECTORY); 3945 if (fd_dir_fd == -1) 3946 continue; 3947 fd_dir = fdopendir(fd_dir_fd); 3948 if (!fd_dir) { 3949 close(fd_dir_fd); 3950 continue; 3951 } 3952 while ((fd_entry = readdir(fd_dir)) != NULL) { 3953 ssize_t link_size; 3954 3955 if (fd_entry->d_type != DT_LNK) 3956 continue; 3957 link_size = readlinkat(fd_dir_fd, fd_entry->d_name, buf, sizeof(buf)); 3958 if (link_size < 0) 3959 continue; 3960 /* Take care as readlink doesn't null terminate the string. */ 3961 if (!strncmp(buf, "anon_inode:[perf_event]", link_size)) { 3962 int cmdline_fd; 3963 ssize_t cmdline_size; 3964 3965 scnprintf(buf, sizeof(buf), "%s/cmdline", proc_entry->d_name); 3966 cmdline_fd = openat(dirfd(proc_dir), buf, O_RDONLY); 3967 if (cmdline_fd == -1) 3968 continue; 3969 cmdline_size = read(cmdline_fd, buf, sizeof(buf) - 1); 3970 close(cmdline_fd); 3971 if (cmdline_size < 0) 3972 continue; 3973 buf[cmdline_size] = '\0'; 3974 for (ssize_t i = 0; i < cmdline_size; i++) { 3975 if (buf[i] == '\0') 3976 buf[i] = ' '; 3977 } 3978 3979 if (printed == 0) 3980 printed += scnprintf(msg, size, "Possible processes:\n"); 3981 3982 printed += scnprintf(msg + printed, size - printed, 3983 "%s %s\n", proc_entry->d_name, buf); 3984 break; 3985 } 3986 } 3987 closedir(fd_dir); 3988 } 3989 closedir(proc_dir); 3990 return printed; 3991 } 3992 3993 int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused, 3994 int err __maybe_unused, 3995 char *msg __maybe_unused, 3996 size_t size __maybe_unused) 3997 { 3998 return 0; 3999 } 4000 4001 int evsel__open_strerror(struct evsel *evsel, struct target *target, 4002 int err, char *msg, size_t size) 4003 { 4004 struct perf_pmu *pmu; 4005 int printed = 0, enforced = 0; 4006 int ret; 4007 4008 switch (err) { 4009 case EPERM: 4010 case EACCES: 4011 printed += scnprintf(msg + printed, size - printed, 4012 "Access to performance monitoring and observability operations is limited.\n"); 4013 4014 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 4015 if (enforced) { 4016 printed += scnprintf(msg + printed, size - printed, 4017 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 4018 "monitoring and observability operations. Inspect system audit records for\n" 4019 "more perf_event access control information and adjusting the policy.\n"); 4020 } 4021 } 4022 4023 if (err == EPERM) 4024 printed += scnprintf(msg, size, 4025 "No permission to enable %s event.\n\n", evsel__name(evsel)); 4026 4027 return printed + scnprintf(msg + printed, size - printed, 4028 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 4029 "access to performance monitoring and observability operations for processes\n" 4030 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 4031 "More information can be found at 'Perf events and tool security' document:\n" 4032 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 4033 "perf_event_paranoid setting is %d:\n" 4034 " -1: Allow use of (almost) all events by all users\n" 4035 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 4036 ">= 0: Disallow raw and ftrace function tracepoint access\n" 4037 ">= 1: Disallow CPU event access\n" 4038 ">= 2: Disallow kernel profiling\n" 4039 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 4040 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 4041 perf_event_paranoid()); 4042 case ENOENT: 4043 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 4044 case EMFILE: 4045 return scnprintf(msg, size, "%s", 4046 "Too many events are opened.\n" 4047 "Probably the maximum number of open file descriptors has been reached.\n" 4048 "Hint: Try again after reducing the number of events.\n" 4049 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 4050 case ENOMEM: 4051 if (evsel__has_callchain(evsel) && 4052 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 4053 return scnprintf(msg, size, 4054 "Not enough memory to setup event with callchain.\n" 4055 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 4056 "Hint: Current value: %d", sysctl__max_stack()); 4057 break; 4058 case ENODEV: 4059 if (target->cpu_list) 4060 return scnprintf(msg, size, "%s", 4061 "No such device - did you specify an out-of-range profile CPU?"); 4062 break; 4063 case EOPNOTSUPP: 4064 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) 4065 return scnprintf(msg, size, 4066 "%s: PMU Hardware or event type doesn't support branch stack sampling.", 4067 evsel__name(evsel)); 4068 if (evsel->core.attr.aux_output) 4069 return scnprintf(msg, size, 4070 "%s: PMU Hardware doesn't support 'aux_output' feature", 4071 evsel__name(evsel)); 4072 if (evsel->core.attr.aux_action) 4073 return scnprintf(msg, size, 4074 "%s: PMU Hardware doesn't support 'aux_action' feature", 4075 evsel__name(evsel)); 4076 if (evsel->core.attr.sample_period != 0) 4077 return scnprintf(msg, size, 4078 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 4079 evsel__name(evsel)); 4080 if (evsel->core.attr.precise_ip) 4081 return scnprintf(msg, size, "%s", 4082 "\'precise\' request may not be supported. Try removing 'p' modifier."); 4083 #if defined(__i386__) || defined(__x86_64__) 4084 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 4085 return scnprintf(msg, size, "%s", 4086 "No hardware sampling interrupt available.\n"); 4087 #endif 4088 if (!target__has_cpu(target)) 4089 return scnprintf(msg, size, 4090 "Unsupported event (%s) in per-thread mode, enable system wide with '-a'.", 4091 evsel__name(evsel)); 4092 break; 4093 case EBUSY: 4094 if (find_process("oprofiled")) 4095 return scnprintf(msg, size, 4096 "The PMU counters are busy/taken by another profiler.\n" 4097 "We found oprofile daemon running, please stop it and try again."); 4098 printed += scnprintf( 4099 msg, size, 4100 "The PMU %s counters are busy and in use by another process.\n", 4101 evsel->pmu ? evsel->pmu->name : ""); 4102 return printed + dump_perf_event_processes(msg + printed, size - printed); 4103 break; 4104 case EINVAL: 4105 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) 4106 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); 4107 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) 4108 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); 4109 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 4110 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 4111 if (perf_missing_features.clockid) 4112 return scnprintf(msg, size, "clockid feature not supported."); 4113 if (perf_missing_features.clockid_wrong) 4114 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 4115 if (perf_missing_features.aux_action) 4116 return scnprintf(msg, size, "The 'aux_action' feature is not supported, update the kernel."); 4117 if (perf_missing_features.aux_output) 4118 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 4119 pmu = evsel__find_pmu(evsel); 4120 if (!pmu->is_core && !target__has_cpu(target)) 4121 return scnprintf(msg, size, 4122 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", 4123 evsel__name(evsel)); 4124 4125 break; 4126 case ENODATA: 4127 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " 4128 "Please add an auxiliary event in front of the load latency event."); 4129 default: 4130 break; 4131 } 4132 4133 ret = arch_evsel__open_strerror(evsel, err, msg, size); 4134 if (ret) 4135 return ret; 4136 4137 errno = err; 4138 return scnprintf(msg, size, 4139 "The sys_perf_event_open() syscall failed for event (%s): %m\n" 4140 "\"dmesg | grep -i perf\" may provide additional information.\n", 4141 evsel__name(evsel)); 4142 } 4143 4144 struct perf_session *evsel__session(struct evsel *evsel) 4145 { 4146 return evsel && evsel->evlist ? evsel->evlist->session : NULL; 4147 } 4148 4149 struct perf_env *evsel__env(struct evsel *evsel) 4150 { 4151 struct perf_session *session = evsel__session(evsel); 4152 4153 return session ? perf_session__env(session) : NULL; 4154 } 4155 4156 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 4157 { 4158 int cpu_map_idx, thread; 4159 4160 if (evsel__is_retire_lat(evsel)) 4161 return 0; 4162 4163 if (perf_pmu__kind(evsel->pmu) != PERF_PMU_KIND_PE) 4164 return 0; 4165 4166 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { 4167 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 4168 thread++) { 4169 int fd = FD(evsel, cpu_map_idx, thread); 4170 4171 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 4172 cpu_map_idx, thread, fd) < 0) 4173 return -1; 4174 } 4175 } 4176 4177 return 0; 4178 } 4179 4180 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 4181 { 4182 struct perf_cpu_map *cpus = evsel->core.cpus; 4183 struct perf_thread_map *threads = evsel->core.threads; 4184 4185 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr)) 4186 return -ENOMEM; 4187 4188 return store_evsel_ids(evsel, evlist); 4189 } 4190 4191 void evsel__zero_per_pkg(struct evsel *evsel) 4192 { 4193 struct hashmap_entry *cur; 4194 size_t bkt; 4195 4196 if (evsel->per_pkg_mask) { 4197 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) 4198 zfree(&cur->pkey); 4199 4200 hashmap__clear(evsel->per_pkg_mask); 4201 } 4202 } 4203 4204 /** 4205 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this 4206 * will be false on hybrid systems for hardware and legacy 4207 * cache events. 4208 */ 4209 bool evsel__is_hybrid(const struct evsel *evsel) 4210 { 4211 if (!evsel->core.is_pmu_core) 4212 return false; 4213 4214 return perf_pmus__num_core_pmus() > 1; 4215 } 4216 4217 struct evsel *evsel__leader(const struct evsel *evsel) 4218 { 4219 if (evsel->core.leader == NULL) 4220 return NULL; 4221 return container_of(evsel->core.leader, struct evsel, core); 4222 } 4223 4224 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) 4225 { 4226 return evsel->core.leader == &leader->core; 4227 } 4228 4229 bool evsel__is_leader(struct evsel *evsel) 4230 { 4231 return evsel__has_leader(evsel, evsel); 4232 } 4233 4234 void evsel__set_leader(struct evsel *evsel, struct evsel *leader) 4235 { 4236 evsel->core.leader = &leader->core; 4237 } 4238 4239 bool evsel__is_aux_event(const struct evsel *evsel) 4240 { 4241 struct perf_pmu *pmu; 4242 4243 if (evsel->needs_auxtrace_mmap) 4244 return true; 4245 4246 pmu = evsel__find_pmu(evsel); 4247 return pmu && pmu->auxtrace; 4248 } 4249 4250 int evsel__source_count(const struct evsel *evsel) 4251 { 4252 struct evsel *pos; 4253 int count = 0; 4254 4255 evlist__for_each_entry(evsel->evlist, pos) { 4256 if (pos->metric_leader == evsel) 4257 count++; 4258 } 4259 return count; 4260 } 4261 4262 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) 4263 { 4264 return false; 4265 } 4266 4267 /* 4268 * Remove an event from a given group (leader). 4269 * Some events, e.g., perf metrics Topdown events, 4270 * must always be grouped. Ignore the events. 4271 */ 4272 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) 4273 { 4274 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { 4275 evsel__set_leader(evsel, evsel); 4276 evsel->core.nr_members = 0; 4277 leader->core.nr_members--; 4278 } 4279 } 4280 4281 bool evsel__set_needs_uniquify(struct evsel *counter, const struct perf_stat_config *config) 4282 { 4283 struct evsel *evsel; 4284 4285 if (counter->needs_uniquify) { 4286 /* Already set. */ 4287 return true; 4288 } 4289 4290 if (counter->use_config_name || counter->is_libpfm_event) { 4291 /* Original name will be used. */ 4292 return false; 4293 } 4294 4295 if (!config->hybrid_merge && evsel__is_hybrid(counter)) { 4296 /* Unique hybrid counters necessary. */ 4297 counter->needs_uniquify = true; 4298 return true; 4299 } 4300 4301 if (counter->core.attr.type < PERF_TYPE_MAX && counter->core.attr.type != PERF_TYPE_RAW) { 4302 /* Legacy event, don't uniquify. */ 4303 return false; 4304 } 4305 4306 if (counter->pmu && counter->pmu->is_core && 4307 counter->alternate_hw_config != PERF_COUNT_HW_MAX) { 4308 /* A sysfs or json event replacing a legacy event, don't uniquify. */ 4309 return false; 4310 } 4311 4312 if (config->aggr_mode == AGGR_NONE) { 4313 /* Always unique with no aggregation. */ 4314 counter->needs_uniquify = true; 4315 return true; 4316 } 4317 4318 if (counter->first_wildcard_match != NULL) { 4319 /* 4320 * If stats are merged then only the first_wildcard_match is 4321 * displayed, there is no need to uniquify this evsel as the 4322 * name won't be shown. 4323 */ 4324 return false; 4325 } 4326 4327 /* 4328 * Do other non-merged events in the evlist have the same name? If so 4329 * uniquify is necessary. 4330 */ 4331 evlist__for_each_entry(counter->evlist, evsel) { 4332 if (evsel == counter || evsel->first_wildcard_match || evsel->pmu == counter->pmu) 4333 continue; 4334 4335 if (evsel__name_is(counter, evsel__name(evsel))) { 4336 counter->needs_uniquify = true; 4337 return true; 4338 } 4339 } 4340 return false; 4341 } 4342 4343 void evsel__uniquify_counter(struct evsel *counter) 4344 { 4345 const char *name, *pmu_name, *config; 4346 char *new_name; 4347 int len, ret; 4348 4349 /* No uniquification necessary. */ 4350 if (!counter->needs_uniquify) 4351 return; 4352 4353 /* The evsel was already uniquified. */ 4354 if (counter->uniquified_name) 4355 return; 4356 4357 /* Avoid checking to uniquify twice. */ 4358 counter->uniquified_name = true; 4359 4360 name = evsel__name(counter); 4361 config = strchr(name, '/'); 4362 pmu_name = counter->pmu->name; 4363 4364 /* Already prefixed by the PMU name? */ 4365 len = pmu_name_len_no_suffix(pmu_name); 4366 4367 if (!strncmp(name, pmu_name, len)) { 4368 /* 4369 * If the PMU name is there, then there is no sense in not 4370 * having a slash. Do this for robustness. 4371 */ 4372 if (config == NULL) 4373 config = name - 1; 4374 4375 ret = asprintf(&new_name, "%s/%s", pmu_name, config + 1); 4376 } else if (config) { 4377 len = config - name; 4378 if (config[1] == '/') { 4379 /* case: event// */ 4380 ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 2); 4381 } else { 4382 /* case: event/.../ */ 4383 ret = asprintf(&new_name, "%s/%.*s,%s", pmu_name, len, name, config + 1); 4384 } 4385 } else { 4386 config = strchr(name, ':'); 4387 if (config) { 4388 /* case: event:.. */ 4389 len = config - name; 4390 4391 ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 1); 4392 } else { 4393 /* case: event */ 4394 ret = asprintf(&new_name, "%s/%s/", pmu_name, name); 4395 } 4396 } 4397 if (ret > 0) { 4398 free(counter->name); 4399 counter->name = new_name; 4400 } else { 4401 /* ENOMEM from asprintf. */ 4402 counter->uniquified_name = false; 4403 } 4404 } 4405 4406 void evsel__warn_user_requested_cpus(struct evsel *evsel, struct perf_cpu_map *user_requested_cpus) 4407 { 4408 struct perf_cpu_map *intersect, *online = NULL; 4409 const struct perf_pmu *pmu = evsel__find_pmu(evsel); 4410 4411 if (pmu && pmu->is_core) { 4412 intersect = perf_cpu_map__intersect(pmu->cpus, user_requested_cpus); 4413 } else { 4414 online = cpu_map__online(); 4415 intersect = perf_cpu_map__intersect(online, user_requested_cpus); 4416 } 4417 if (!perf_cpu_map__equal(intersect, user_requested_cpus)) { 4418 char buf1[128]; 4419 char buf2[128]; 4420 4421 cpu_map__snprint(user_requested_cpus, buf1, sizeof(buf1)); 4422 cpu_map__snprint(online ?: pmu->cpus, buf2, sizeof(buf2)); 4423 pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n", 4424 buf1, pmu ? pmu->name : "cpu", buf2, evsel__name(evsel)); 4425 } 4426 perf_cpu_map__put(intersect); 4427 perf_cpu_map__put(online); 4428 } 4429