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 #include <byteswap.h> 10 #include <errno.h> 11 #include <inttypes.h> 12 #include <linux/bitops.h> 13 #include <api/fs/fs.h> 14 #include <api/fs/tracing_path.h> 15 #include <traceevent/event-parse.h> 16 #include <linux/hw_breakpoint.h> 17 #include <linux/perf_event.h> 18 #include <linux/compiler.h> 19 #include <linux/err.h> 20 #include <linux/zalloc.h> 21 #include <sys/ioctl.h> 22 #include <sys/resource.h> 23 #include <sys/types.h> 24 #include <dirent.h> 25 #include <stdlib.h> 26 #include <perf/evsel.h> 27 #include "asm/bug.h" 28 #include "bpf_counter.h" 29 #include "callchain.h" 30 #include "cgroup.h" 31 #include "counts.h" 32 #include "event.h" 33 #include "evsel.h" 34 #include "util/env.h" 35 #include "util/evsel_config.h" 36 #include "util/evsel_fprintf.h" 37 #include "evlist.h" 38 #include <perf/cpumap.h> 39 #include "thread_map.h" 40 #include "target.h" 41 #include "perf_regs.h" 42 #include "record.h" 43 #include "debug.h" 44 #include "trace-event.h" 45 #include "stat.h" 46 #include "string2.h" 47 #include "memswap.h" 48 #include "util.h" 49 #include "hashmap.h" 50 #include "pmu-hybrid.h" 51 #include "off_cpu.h" 52 #include "../perf-sys.h" 53 #include "util/parse-branch-options.h" 54 #include <internal/xyarray.h> 55 #include <internal/lib.h> 56 57 #include <linux/ctype.h> 58 59 struct perf_missing_features perf_missing_features; 60 61 static clockid_t clockid; 62 63 static const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = { 64 NULL, 65 "duration_time", 66 "user_time", 67 "system_time", 68 }; 69 70 const char *perf_tool_event__to_str(enum perf_tool_event ev) 71 { 72 if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX) 73 return perf_tool_event__tool_names[ev]; 74 75 return NULL; 76 } 77 78 enum perf_tool_event perf_tool_event__from_str(const char *str) 79 { 80 int i; 81 82 perf_tool_event__for_each_event(i) { 83 if (!strcmp(str, perf_tool_event__tool_names[i])) 84 return i; 85 } 86 return PERF_TOOL_NONE; 87 } 88 89 90 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused) 91 { 92 return 0; 93 } 94 95 void __weak test_attr__ready(void) { } 96 97 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused) 98 { 99 } 100 101 static struct { 102 size_t size; 103 int (*init)(struct evsel *evsel); 104 void (*fini)(struct evsel *evsel); 105 } perf_evsel__object = { 106 .size = sizeof(struct evsel), 107 .init = evsel__no_extra_init, 108 .fini = evsel__no_extra_fini, 109 }; 110 111 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel), 112 void (*fini)(struct evsel *evsel)) 113 { 114 115 if (object_size == 0) 116 goto set_methods; 117 118 if (perf_evsel__object.size > object_size) 119 return -EINVAL; 120 121 perf_evsel__object.size = object_size; 122 123 set_methods: 124 if (init != NULL) 125 perf_evsel__object.init = init; 126 127 if (fini != NULL) 128 perf_evsel__object.fini = fini; 129 130 return 0; 131 } 132 133 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 134 135 int __evsel__sample_size(u64 sample_type) 136 { 137 u64 mask = sample_type & PERF_SAMPLE_MASK; 138 int size = 0; 139 int i; 140 141 for (i = 0; i < 64; i++) { 142 if (mask & (1ULL << i)) 143 size++; 144 } 145 146 size *= sizeof(u64); 147 148 return size; 149 } 150 151 /** 152 * __perf_evsel__calc_id_pos - calculate id_pos. 153 * @sample_type: sample type 154 * 155 * This function returns the position of the event id (PERF_SAMPLE_ID or 156 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 157 * perf_record_sample. 158 */ 159 static int __perf_evsel__calc_id_pos(u64 sample_type) 160 { 161 int idx = 0; 162 163 if (sample_type & PERF_SAMPLE_IDENTIFIER) 164 return 0; 165 166 if (!(sample_type & PERF_SAMPLE_ID)) 167 return -1; 168 169 if (sample_type & PERF_SAMPLE_IP) 170 idx += 1; 171 172 if (sample_type & PERF_SAMPLE_TID) 173 idx += 1; 174 175 if (sample_type & PERF_SAMPLE_TIME) 176 idx += 1; 177 178 if (sample_type & PERF_SAMPLE_ADDR) 179 idx += 1; 180 181 return idx; 182 } 183 184 /** 185 * __perf_evsel__calc_is_pos - calculate is_pos. 186 * @sample_type: sample type 187 * 188 * This function returns the position (counting backwards) of the event id 189 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 190 * sample_id_all is used there is an id sample appended to non-sample events. 191 */ 192 static int __perf_evsel__calc_is_pos(u64 sample_type) 193 { 194 int idx = 1; 195 196 if (sample_type & PERF_SAMPLE_IDENTIFIER) 197 return 1; 198 199 if (!(sample_type & PERF_SAMPLE_ID)) 200 return -1; 201 202 if (sample_type & PERF_SAMPLE_CPU) 203 idx += 1; 204 205 if (sample_type & PERF_SAMPLE_STREAM_ID) 206 idx += 1; 207 208 return idx; 209 } 210 211 void evsel__calc_id_pos(struct evsel *evsel) 212 { 213 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type); 214 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type); 215 } 216 217 void __evsel__set_sample_bit(struct evsel *evsel, 218 enum perf_event_sample_format bit) 219 { 220 if (!(evsel->core.attr.sample_type & bit)) { 221 evsel->core.attr.sample_type |= bit; 222 evsel->sample_size += sizeof(u64); 223 evsel__calc_id_pos(evsel); 224 } 225 } 226 227 void __evsel__reset_sample_bit(struct evsel *evsel, 228 enum perf_event_sample_format bit) 229 { 230 if (evsel->core.attr.sample_type & bit) { 231 evsel->core.attr.sample_type &= ~bit; 232 evsel->sample_size -= sizeof(u64); 233 evsel__calc_id_pos(evsel); 234 } 235 } 236 237 void evsel__set_sample_id(struct evsel *evsel, 238 bool can_sample_identifier) 239 { 240 if (can_sample_identifier) { 241 evsel__reset_sample_bit(evsel, ID); 242 evsel__set_sample_bit(evsel, IDENTIFIER); 243 } else { 244 evsel__set_sample_bit(evsel, ID); 245 } 246 evsel->core.attr.read_format |= PERF_FORMAT_ID; 247 } 248 249 /** 250 * evsel__is_function_event - Return whether given evsel is a function 251 * trace event 252 * 253 * @evsel - evsel selector to be tested 254 * 255 * Return %true if event is function trace event 256 */ 257 bool evsel__is_function_event(struct evsel *evsel) 258 { 259 #define FUNCTION_EVENT "ftrace:function" 260 261 return evsel->name && 262 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT)); 263 264 #undef FUNCTION_EVENT 265 } 266 267 void evsel__init(struct evsel *evsel, 268 struct perf_event_attr *attr, int idx) 269 { 270 perf_evsel__init(&evsel->core, attr, idx); 271 evsel->tracking = !idx; 272 evsel->unit = strdup(""); 273 evsel->scale = 1.0; 274 evsel->max_events = ULONG_MAX; 275 evsel->evlist = NULL; 276 evsel->bpf_obj = NULL; 277 evsel->bpf_fd = -1; 278 INIT_LIST_HEAD(&evsel->config_terms); 279 INIT_LIST_HEAD(&evsel->bpf_counter_list); 280 perf_evsel__object.init(evsel); 281 evsel->sample_size = __evsel__sample_size(attr->sample_type); 282 evsel__calc_id_pos(evsel); 283 evsel->cmdline_group_boundary = false; 284 evsel->metric_expr = NULL; 285 evsel->metric_name = NULL; 286 evsel->metric_events = NULL; 287 evsel->per_pkg_mask = NULL; 288 evsel->collect_stat = false; 289 evsel->pmu_name = NULL; 290 } 291 292 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 293 { 294 struct evsel *evsel = zalloc(perf_evsel__object.size); 295 296 if (!evsel) 297 return NULL; 298 evsel__init(evsel, attr, idx); 299 300 if (evsel__is_bpf_output(evsel) && !attr->sample_type) { 301 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 302 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 303 evsel->core.attr.sample_period = 1; 304 } 305 306 if (evsel__is_clock(evsel)) { 307 free((char *)evsel->unit); 308 evsel->unit = strdup("msec"); 309 evsel->scale = 1e-6; 310 } 311 312 return evsel; 313 } 314 315 static bool perf_event_can_profile_kernel(void) 316 { 317 return perf_event_paranoid_check(1); 318 } 319 320 struct evsel *evsel__new_cycles(bool precise __maybe_unused, __u32 type, __u64 config) 321 { 322 struct perf_event_attr attr = { 323 .type = type, 324 .config = config, 325 .exclude_kernel = !perf_event_can_profile_kernel(), 326 }; 327 struct evsel *evsel; 328 329 event_attr_init(&attr); 330 331 /* 332 * Now let the usual logic to set up the perf_event_attr defaults 333 * to kick in when we return and before perf_evsel__open() is called. 334 */ 335 evsel = evsel__new(&attr); 336 if (evsel == NULL) 337 goto out; 338 339 arch_evsel__fixup_new_cycles(&evsel->core.attr); 340 341 evsel->precise_max = true; 342 343 /* use asprintf() because free(evsel) assumes name is allocated */ 344 if (asprintf(&evsel->name, "cycles%s%s%.*s", 345 (attr.precise_ip || attr.exclude_kernel) ? ":" : "", 346 attr.exclude_kernel ? "u" : "", 347 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0) 348 goto error_free; 349 out: 350 return evsel; 351 error_free: 352 evsel__delete(evsel); 353 evsel = NULL; 354 goto out; 355 } 356 357 int copy_config_terms(struct list_head *dst, struct list_head *src) 358 { 359 struct evsel_config_term *pos, *tmp; 360 361 list_for_each_entry(pos, src, list) { 362 tmp = malloc(sizeof(*tmp)); 363 if (tmp == NULL) 364 return -ENOMEM; 365 366 *tmp = *pos; 367 if (tmp->free_str) { 368 tmp->val.str = strdup(pos->val.str); 369 if (tmp->val.str == NULL) { 370 free(tmp); 371 return -ENOMEM; 372 } 373 } 374 list_add_tail(&tmp->list, dst); 375 } 376 return 0; 377 } 378 379 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) 380 { 381 return copy_config_terms(&dst->config_terms, &src->config_terms); 382 } 383 384 /** 385 * evsel__clone - create a new evsel copied from @orig 386 * @orig: original evsel 387 * 388 * The assumption is that @orig is not configured nor opened yet. 389 * So we only care about the attributes that can be set while it's parsed. 390 */ 391 struct evsel *evsel__clone(struct evsel *orig) 392 { 393 struct evsel *evsel; 394 395 BUG_ON(orig->core.fd); 396 BUG_ON(orig->counts); 397 BUG_ON(orig->priv); 398 BUG_ON(orig->per_pkg_mask); 399 400 /* cannot handle BPF objects for now */ 401 if (orig->bpf_obj) 402 return NULL; 403 404 evsel = evsel__new(&orig->core.attr); 405 if (evsel == NULL) 406 return NULL; 407 408 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus); 409 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus); 410 evsel->core.threads = perf_thread_map__get(orig->core.threads); 411 evsel->core.nr_members = orig->core.nr_members; 412 evsel->core.system_wide = orig->core.system_wide; 413 evsel->core.requires_cpu = orig->core.requires_cpu; 414 415 if (orig->name) { 416 evsel->name = strdup(orig->name); 417 if (evsel->name == NULL) 418 goto out_err; 419 } 420 if (orig->group_name) { 421 evsel->group_name = strdup(orig->group_name); 422 if (evsel->group_name == NULL) 423 goto out_err; 424 } 425 if (orig->pmu_name) { 426 evsel->pmu_name = strdup(orig->pmu_name); 427 if (evsel->pmu_name == NULL) 428 goto out_err; 429 } 430 if (orig->filter) { 431 evsel->filter = strdup(orig->filter); 432 if (evsel->filter == NULL) 433 goto out_err; 434 } 435 if (orig->metric_id) { 436 evsel->metric_id = strdup(orig->metric_id); 437 if (evsel->metric_id == NULL) 438 goto out_err; 439 } 440 evsel->cgrp = cgroup__get(orig->cgrp); 441 evsel->tp_format = orig->tp_format; 442 evsel->handler = orig->handler; 443 evsel->core.leader = orig->core.leader; 444 445 evsel->max_events = orig->max_events; 446 evsel->tool_event = orig->tool_event; 447 free((char *)evsel->unit); 448 evsel->unit = strdup(orig->unit); 449 if (evsel->unit == NULL) 450 goto out_err; 451 452 evsel->scale = orig->scale; 453 evsel->snapshot = orig->snapshot; 454 evsel->per_pkg = orig->per_pkg; 455 evsel->percore = orig->percore; 456 evsel->precise_max = orig->precise_max; 457 evsel->use_uncore_alias = orig->use_uncore_alias; 458 evsel->is_libpfm_event = orig->is_libpfm_event; 459 460 evsel->exclude_GH = orig->exclude_GH; 461 evsel->sample_read = orig->sample_read; 462 evsel->auto_merge_stats = orig->auto_merge_stats; 463 evsel->collect_stat = orig->collect_stat; 464 evsel->weak_group = orig->weak_group; 465 evsel->use_config_name = orig->use_config_name; 466 467 if (evsel__copy_config_terms(evsel, orig) < 0) 468 goto out_err; 469 470 return evsel; 471 472 out_err: 473 evsel__delete(evsel); 474 return NULL; 475 } 476 477 /* 478 * Returns pointer with encoded error via <linux/err.h> interface. 479 */ 480 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx) 481 { 482 struct evsel *evsel = zalloc(perf_evsel__object.size); 483 int err = -ENOMEM; 484 485 if (evsel == NULL) { 486 goto out_err; 487 } else { 488 struct perf_event_attr attr = { 489 .type = PERF_TYPE_TRACEPOINT, 490 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 491 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 492 }; 493 494 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 495 goto out_free; 496 497 evsel->tp_format = trace_event__tp_format(sys, name); 498 if (IS_ERR(evsel->tp_format)) { 499 err = PTR_ERR(evsel->tp_format); 500 goto out_free; 501 } 502 503 event_attr_init(&attr); 504 attr.config = evsel->tp_format->id; 505 attr.sample_period = 1; 506 evsel__init(evsel, &attr, idx); 507 } 508 509 return evsel; 510 511 out_free: 512 zfree(&evsel->name); 513 free(evsel); 514 out_err: 515 return ERR_PTR(err); 516 } 517 518 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = { 519 "cycles", 520 "instructions", 521 "cache-references", 522 "cache-misses", 523 "branches", 524 "branch-misses", 525 "bus-cycles", 526 "stalled-cycles-frontend", 527 "stalled-cycles-backend", 528 "ref-cycles", 529 }; 530 531 char *evsel__bpf_counter_events; 532 533 bool evsel__match_bpf_counter_events(const char *name) 534 { 535 int name_len; 536 bool match; 537 char *ptr; 538 539 if (!evsel__bpf_counter_events) 540 return false; 541 542 ptr = strstr(evsel__bpf_counter_events, name); 543 name_len = strlen(name); 544 545 /* check name matches a full token in evsel__bpf_counter_events */ 546 match = (ptr != NULL) && 547 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && 548 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); 549 550 return match; 551 } 552 553 static const char *__evsel__hw_name(u64 config) 554 { 555 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 556 return evsel__hw_names[config]; 557 558 return "unknown-hardware"; 559 } 560 561 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 562 { 563 int colon = 0, r = 0; 564 struct perf_event_attr *attr = &evsel->core.attr; 565 bool exclude_guest_default = false; 566 567 #define MOD_PRINT(context, mod) do { \ 568 if (!attr->exclude_##context) { \ 569 if (!colon) colon = ++r; \ 570 r += scnprintf(bf + r, size - r, "%c", mod); \ 571 } } while(0) 572 573 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 574 MOD_PRINT(kernel, 'k'); 575 MOD_PRINT(user, 'u'); 576 MOD_PRINT(hv, 'h'); 577 exclude_guest_default = true; 578 } 579 580 if (attr->precise_ip) { 581 if (!colon) 582 colon = ++r; 583 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 584 exclude_guest_default = true; 585 } 586 587 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 588 MOD_PRINT(host, 'H'); 589 MOD_PRINT(guest, 'G'); 590 } 591 #undef MOD_PRINT 592 if (colon) 593 bf[colon - 1] = ':'; 594 return r; 595 } 596 597 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 598 { 599 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 600 } 601 602 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 603 { 604 int r = arch_evsel__hw_name(evsel, bf, size); 605 return r + evsel__add_modifiers(evsel, bf + r, size - r); 606 } 607 608 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = { 609 "cpu-clock", 610 "task-clock", 611 "page-faults", 612 "context-switches", 613 "cpu-migrations", 614 "minor-faults", 615 "major-faults", 616 "alignment-faults", 617 "emulation-faults", 618 "dummy", 619 }; 620 621 static const char *__evsel__sw_name(u64 config) 622 { 623 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 624 return evsel__sw_names[config]; 625 return "unknown-software"; 626 } 627 628 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 629 { 630 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 631 return r + evsel__add_modifiers(evsel, bf + r, size - r); 632 } 633 634 static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size) 635 { 636 return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev)); 637 } 638 639 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 640 { 641 int r; 642 643 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 644 645 if (type & HW_BREAKPOINT_R) 646 r += scnprintf(bf + r, size - r, "r"); 647 648 if (type & HW_BREAKPOINT_W) 649 r += scnprintf(bf + r, size - r, "w"); 650 651 if (type & HW_BREAKPOINT_X) 652 r += scnprintf(bf + r, size - r, "x"); 653 654 return r; 655 } 656 657 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 658 { 659 struct perf_event_attr *attr = &evsel->core.attr; 660 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 661 return r + evsel__add_modifiers(evsel, bf + r, size - r); 662 } 663 664 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 665 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 666 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 667 { "LLC", "L2", }, 668 { "dTLB", "d-tlb", "Data-TLB", }, 669 { "iTLB", "i-tlb", "Instruction-TLB", }, 670 { "branch", "branches", "bpu", "btb", "bpc", }, 671 { "node", }, 672 }; 673 674 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 675 { "load", "loads", "read", }, 676 { "store", "stores", "write", }, 677 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 678 }; 679 680 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 681 { "refs", "Reference", "ops", "access", }, 682 { "misses", "miss", }, 683 }; 684 685 #define C(x) PERF_COUNT_HW_CACHE_##x 686 #define CACHE_READ (1 << C(OP_READ)) 687 #define CACHE_WRITE (1 << C(OP_WRITE)) 688 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 689 #define COP(x) (1 << x) 690 691 /* 692 * cache operation stat 693 * L1I : Read and prefetch only 694 * ITLB and BPU : Read-only 695 */ 696 static const unsigned long evsel__hw_cache_stat[C(MAX)] = { 697 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 698 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 699 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 700 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 701 [C(ITLB)] = (CACHE_READ), 702 [C(BPU)] = (CACHE_READ), 703 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 704 }; 705 706 bool evsel__is_cache_op_valid(u8 type, u8 op) 707 { 708 if (evsel__hw_cache_stat[type] & COP(op)) 709 return true; /* valid */ 710 else 711 return false; /* invalid */ 712 } 713 714 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 715 { 716 if (result) { 717 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 718 evsel__hw_cache_op[op][0], 719 evsel__hw_cache_result[result][0]); 720 } 721 722 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 723 evsel__hw_cache_op[op][1]); 724 } 725 726 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 727 { 728 u8 op, result, type = (config >> 0) & 0xff; 729 const char *err = "unknown-ext-hardware-cache-type"; 730 731 if (type >= PERF_COUNT_HW_CACHE_MAX) 732 goto out_err; 733 734 op = (config >> 8) & 0xff; 735 err = "unknown-ext-hardware-cache-op"; 736 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 737 goto out_err; 738 739 result = (config >> 16) & 0xff; 740 err = "unknown-ext-hardware-cache-result"; 741 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 742 goto out_err; 743 744 err = "invalid-cache"; 745 if (!evsel__is_cache_op_valid(type, op)) 746 goto out_err; 747 748 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 749 out_err: 750 return scnprintf(bf, size, "%s", err); 751 } 752 753 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 754 { 755 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 756 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 757 } 758 759 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 760 { 761 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 762 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 763 } 764 765 const char *evsel__name(struct evsel *evsel) 766 { 767 char bf[128]; 768 769 if (!evsel) 770 goto out_unknown; 771 772 if (evsel->name) 773 return evsel->name; 774 775 switch (evsel->core.attr.type) { 776 case PERF_TYPE_RAW: 777 evsel__raw_name(evsel, bf, sizeof(bf)); 778 break; 779 780 case PERF_TYPE_HARDWARE: 781 evsel__hw_name(evsel, bf, sizeof(bf)); 782 break; 783 784 case PERF_TYPE_HW_CACHE: 785 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 786 break; 787 788 case PERF_TYPE_SOFTWARE: 789 if (evsel__is_tool(evsel)) 790 evsel__tool_name(evsel->tool_event, bf, sizeof(bf)); 791 else 792 evsel__sw_name(evsel, bf, sizeof(bf)); 793 break; 794 795 case PERF_TYPE_TRACEPOINT: 796 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 797 break; 798 799 case PERF_TYPE_BREAKPOINT: 800 evsel__bp_name(evsel, bf, sizeof(bf)); 801 break; 802 803 default: 804 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 805 evsel->core.attr.type); 806 break; 807 } 808 809 evsel->name = strdup(bf); 810 811 if (evsel->name) 812 return evsel->name; 813 out_unknown: 814 return "unknown"; 815 } 816 817 const char *evsel__metric_id(const struct evsel *evsel) 818 { 819 if (evsel->metric_id) 820 return evsel->metric_id; 821 822 if (evsel__is_tool(evsel)) 823 return perf_tool_event__to_str(evsel->tool_event); 824 825 return "unknown"; 826 } 827 828 const char *evsel__group_name(struct evsel *evsel) 829 { 830 return evsel->group_name ?: "anon group"; 831 } 832 833 /* 834 * Returns the group details for the specified leader, 835 * with following rules. 836 * 837 * For record -e '{cycles,instructions}' 838 * 'anon group { cycles:u, instructions:u }' 839 * 840 * For record -e 'cycles,instructions' and report --group 841 * 'cycles:u, instructions:u' 842 */ 843 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 844 { 845 int ret = 0; 846 struct evsel *pos; 847 const char *group_name = evsel__group_name(evsel); 848 849 if (!evsel->forced_leader) 850 ret = scnprintf(buf, size, "%s { ", group_name); 851 852 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel)); 853 854 for_each_group_member(pos, evsel) 855 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos)); 856 857 if (!evsel->forced_leader) 858 ret += scnprintf(buf + ret, size - ret, " }"); 859 860 return ret; 861 } 862 863 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 864 struct callchain_param *param) 865 { 866 bool function = evsel__is_function_event(evsel); 867 struct perf_event_attr *attr = &evsel->core.attr; 868 869 evsel__set_sample_bit(evsel, CALLCHAIN); 870 871 attr->sample_max_stack = param->max_stack; 872 873 if (opts->kernel_callchains) 874 attr->exclude_callchain_user = 1; 875 if (opts->user_callchains) 876 attr->exclude_callchain_kernel = 1; 877 if (param->record_mode == CALLCHAIN_LBR) { 878 if (!opts->branch_stack) { 879 if (attr->exclude_user) { 880 pr_warning("LBR callstack option is only available " 881 "to get user callchain information. " 882 "Falling back to framepointers.\n"); 883 } else { 884 evsel__set_sample_bit(evsel, BRANCH_STACK); 885 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 886 PERF_SAMPLE_BRANCH_CALL_STACK | 887 PERF_SAMPLE_BRANCH_NO_CYCLES | 888 PERF_SAMPLE_BRANCH_NO_FLAGS | 889 PERF_SAMPLE_BRANCH_HW_INDEX; 890 } 891 } else 892 pr_warning("Cannot use LBR callstack with branch stack. " 893 "Falling back to framepointers.\n"); 894 } 895 896 if (param->record_mode == CALLCHAIN_DWARF) { 897 if (!function) { 898 evsel__set_sample_bit(evsel, REGS_USER); 899 evsel__set_sample_bit(evsel, STACK_USER); 900 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) { 901 attr->sample_regs_user |= DWARF_MINIMAL_REGS; 902 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 903 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 904 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 905 } else { 906 attr->sample_regs_user |= arch__user_reg_mask(); 907 } 908 attr->sample_stack_user = param->dump_size; 909 attr->exclude_callchain_user = 1; 910 } else { 911 pr_info("Cannot use DWARF unwind for function trace event," 912 " falling back to framepointers.\n"); 913 } 914 } 915 916 if (function) { 917 pr_info("Disabling user space callchains for function trace event.\n"); 918 attr->exclude_callchain_user = 1; 919 } 920 } 921 922 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 923 struct callchain_param *param) 924 { 925 if (param->enabled) 926 return __evsel__config_callchain(evsel, opts, param); 927 } 928 929 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param) 930 { 931 struct perf_event_attr *attr = &evsel->core.attr; 932 933 evsel__reset_sample_bit(evsel, CALLCHAIN); 934 if (param->record_mode == CALLCHAIN_LBR) { 935 evsel__reset_sample_bit(evsel, BRANCH_STACK); 936 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 937 PERF_SAMPLE_BRANCH_CALL_STACK | 938 PERF_SAMPLE_BRANCH_HW_INDEX); 939 } 940 if (param->record_mode == CALLCHAIN_DWARF) { 941 evsel__reset_sample_bit(evsel, REGS_USER); 942 evsel__reset_sample_bit(evsel, STACK_USER); 943 } 944 } 945 946 static void evsel__apply_config_terms(struct evsel *evsel, 947 struct record_opts *opts, bool track) 948 { 949 struct evsel_config_term *term; 950 struct list_head *config_terms = &evsel->config_terms; 951 struct perf_event_attr *attr = &evsel->core.attr; 952 /* callgraph default */ 953 struct callchain_param param = { 954 .record_mode = callchain_param.record_mode, 955 }; 956 u32 dump_size = 0; 957 int max_stack = 0; 958 const char *callgraph_buf = NULL; 959 960 list_for_each_entry(term, config_terms, list) { 961 switch (term->type) { 962 case EVSEL__CONFIG_TERM_PERIOD: 963 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 964 attr->sample_period = term->val.period; 965 attr->freq = 0; 966 evsel__reset_sample_bit(evsel, PERIOD); 967 } 968 break; 969 case EVSEL__CONFIG_TERM_FREQ: 970 if (!(term->weak && opts->user_freq != UINT_MAX)) { 971 attr->sample_freq = term->val.freq; 972 attr->freq = 1; 973 evsel__set_sample_bit(evsel, PERIOD); 974 } 975 break; 976 case EVSEL__CONFIG_TERM_TIME: 977 if (term->val.time) 978 evsel__set_sample_bit(evsel, TIME); 979 else 980 evsel__reset_sample_bit(evsel, TIME); 981 break; 982 case EVSEL__CONFIG_TERM_CALLGRAPH: 983 callgraph_buf = term->val.str; 984 break; 985 case EVSEL__CONFIG_TERM_BRANCH: 986 if (term->val.str && strcmp(term->val.str, "no")) { 987 evsel__set_sample_bit(evsel, BRANCH_STACK); 988 parse_branch_str(term->val.str, 989 &attr->branch_sample_type); 990 } else 991 evsel__reset_sample_bit(evsel, BRANCH_STACK); 992 break; 993 case EVSEL__CONFIG_TERM_STACK_USER: 994 dump_size = term->val.stack_user; 995 break; 996 case EVSEL__CONFIG_TERM_MAX_STACK: 997 max_stack = term->val.max_stack; 998 break; 999 case EVSEL__CONFIG_TERM_MAX_EVENTS: 1000 evsel->max_events = term->val.max_events; 1001 break; 1002 case EVSEL__CONFIG_TERM_INHERIT: 1003 /* 1004 * attr->inherit should has already been set by 1005 * evsel__config. If user explicitly set 1006 * inherit using config terms, override global 1007 * opt->no_inherit setting. 1008 */ 1009 attr->inherit = term->val.inherit ? 1 : 0; 1010 break; 1011 case EVSEL__CONFIG_TERM_OVERWRITE: 1012 attr->write_backward = term->val.overwrite ? 1 : 0; 1013 break; 1014 case EVSEL__CONFIG_TERM_DRV_CFG: 1015 break; 1016 case EVSEL__CONFIG_TERM_PERCORE: 1017 break; 1018 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 1019 attr->aux_output = term->val.aux_output ? 1 : 0; 1020 break; 1021 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 1022 /* Already applied by auxtrace */ 1023 break; 1024 case EVSEL__CONFIG_TERM_CFG_CHG: 1025 break; 1026 default: 1027 break; 1028 } 1029 } 1030 1031 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 1032 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 1033 bool sample_address = false; 1034 1035 if (max_stack) { 1036 param.max_stack = max_stack; 1037 if (callgraph_buf == NULL) 1038 callgraph_buf = "fp"; 1039 } 1040 1041 /* parse callgraph parameters */ 1042 if (callgraph_buf != NULL) { 1043 if (!strcmp(callgraph_buf, "no")) { 1044 param.enabled = false; 1045 param.record_mode = CALLCHAIN_NONE; 1046 } else { 1047 param.enabled = true; 1048 if (parse_callchain_record(callgraph_buf, ¶m)) { 1049 pr_err("per-event callgraph setting for %s failed. " 1050 "Apply callgraph global setting for it\n", 1051 evsel->name); 1052 return; 1053 } 1054 if (param.record_mode == CALLCHAIN_DWARF) 1055 sample_address = true; 1056 } 1057 } 1058 if (dump_size > 0) { 1059 dump_size = round_up(dump_size, sizeof(u64)); 1060 param.dump_size = dump_size; 1061 } 1062 1063 /* If global callgraph set, clear it */ 1064 if (callchain_param.enabled) 1065 evsel__reset_callgraph(evsel, &callchain_param); 1066 1067 /* set perf-event callgraph */ 1068 if (param.enabled) { 1069 if (sample_address) { 1070 evsel__set_sample_bit(evsel, ADDR); 1071 evsel__set_sample_bit(evsel, DATA_SRC); 1072 evsel->core.attr.mmap_data = track; 1073 } 1074 evsel__config_callchain(evsel, opts, ¶m); 1075 } 1076 } 1077 } 1078 1079 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 1080 { 1081 struct evsel_config_term *term, *found_term = NULL; 1082 1083 list_for_each_entry(term, &evsel->config_terms, list) { 1084 if (term->type == type) 1085 found_term = term; 1086 } 1087 1088 return found_term; 1089 } 1090 1091 void __weak arch_evsel__set_sample_weight(struct evsel *evsel) 1092 { 1093 evsel__set_sample_bit(evsel, WEIGHT); 1094 } 1095 1096 void __weak arch_evsel__fixup_new_cycles(struct perf_event_attr *attr __maybe_unused) 1097 { 1098 } 1099 1100 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, 1101 struct perf_event_attr *attr __maybe_unused) 1102 { 1103 } 1104 1105 static void evsel__set_default_freq_period(struct record_opts *opts, 1106 struct perf_event_attr *attr) 1107 { 1108 if (opts->freq) { 1109 attr->freq = 1; 1110 attr->sample_freq = opts->freq; 1111 } else { 1112 attr->sample_period = opts->default_interval; 1113 } 1114 } 1115 1116 static bool evsel__is_offcpu_event(struct evsel *evsel) 1117 { 1118 return evsel__is_bpf_output(evsel) && !strcmp(evsel->name, OFFCPU_EVENT); 1119 } 1120 1121 /* 1122 * The enable_on_exec/disabled value strategy: 1123 * 1124 * 1) For any type of traced program: 1125 * - all independent events and group leaders are disabled 1126 * - all group members are enabled 1127 * 1128 * Group members are ruled by group leaders. They need to 1129 * be enabled, because the group scheduling relies on that. 1130 * 1131 * 2) For traced programs executed by perf: 1132 * - all independent events and group leaders have 1133 * enable_on_exec set 1134 * - we don't specifically enable or disable any event during 1135 * the record command 1136 * 1137 * Independent events and group leaders are initially disabled 1138 * and get enabled by exec. Group members are ruled by group 1139 * leaders as stated in 1). 1140 * 1141 * 3) For traced programs attached by perf (pid/tid): 1142 * - we specifically enable or disable all events during 1143 * the record command 1144 * 1145 * When attaching events to already running traced we 1146 * enable/disable events specifically, as there's no 1147 * initial traced exec call. 1148 */ 1149 void evsel__config(struct evsel *evsel, struct record_opts *opts, 1150 struct callchain_param *callchain) 1151 { 1152 struct evsel *leader = evsel__leader(evsel); 1153 struct perf_event_attr *attr = &evsel->core.attr; 1154 int track = evsel->tracking; 1155 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 1156 1157 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 1158 attr->inherit = !opts->no_inherit; 1159 attr->write_backward = opts->overwrite ? 1 : 0; 1160 1161 evsel__set_sample_bit(evsel, IP); 1162 evsel__set_sample_bit(evsel, TID); 1163 1164 if (evsel->sample_read) { 1165 evsel__set_sample_bit(evsel, READ); 1166 1167 /* 1168 * We need ID even in case of single event, because 1169 * PERF_SAMPLE_READ process ID specific data. 1170 */ 1171 evsel__set_sample_id(evsel, false); 1172 1173 /* 1174 * Apply group format only if we belong to group 1175 * with more than one members. 1176 */ 1177 if (leader->core.nr_members > 1) { 1178 attr->read_format |= PERF_FORMAT_GROUP; 1179 attr->inherit = 0; 1180 } 1181 } 1182 1183 /* 1184 * We default some events to have a default interval. But keep 1185 * it a weak assumption overridable by the user. 1186 */ 1187 if ((evsel->is_libpfm_event && !attr->sample_period) || 1188 (!evsel->is_libpfm_event && (!attr->sample_period || 1189 opts->user_freq != UINT_MAX || 1190 opts->user_interval != ULLONG_MAX))) 1191 evsel__set_default_freq_period(opts, attr); 1192 1193 /* 1194 * If attr->freq was set (here or earlier), ask for period 1195 * to be sampled. 1196 */ 1197 if (attr->freq) 1198 evsel__set_sample_bit(evsel, PERIOD); 1199 1200 if (opts->no_samples) 1201 attr->sample_freq = 0; 1202 1203 if (opts->inherit_stat) { 1204 evsel->core.attr.read_format |= 1205 PERF_FORMAT_TOTAL_TIME_ENABLED | 1206 PERF_FORMAT_TOTAL_TIME_RUNNING | 1207 PERF_FORMAT_ID; 1208 attr->inherit_stat = 1; 1209 } 1210 1211 if (opts->sample_address) { 1212 evsel__set_sample_bit(evsel, ADDR); 1213 attr->mmap_data = track; 1214 } 1215 1216 /* 1217 * We don't allow user space callchains for function trace 1218 * event, due to issues with page faults while tracing page 1219 * fault handler and its overall trickiness nature. 1220 */ 1221 if (evsel__is_function_event(evsel)) 1222 evsel->core.attr.exclude_callchain_user = 1; 1223 1224 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1225 evsel__config_callchain(evsel, opts, callchain); 1226 1227 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1228 !evsel__is_dummy_event(evsel)) { 1229 attr->sample_regs_intr = opts->sample_intr_regs; 1230 evsel__set_sample_bit(evsel, REGS_INTR); 1231 } 1232 1233 if (opts->sample_user_regs && !evsel->no_aux_samples && 1234 !evsel__is_dummy_event(evsel)) { 1235 attr->sample_regs_user |= opts->sample_user_regs; 1236 evsel__set_sample_bit(evsel, REGS_USER); 1237 } 1238 1239 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1240 evsel__set_sample_bit(evsel, CPU); 1241 1242 /* 1243 * When the user explicitly disabled time don't force it here. 1244 */ 1245 if (opts->sample_time && 1246 (!perf_missing_features.sample_id_all && 1247 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1248 opts->sample_time_set))) 1249 evsel__set_sample_bit(evsel, TIME); 1250 1251 if (opts->raw_samples && !evsel->no_aux_samples) { 1252 evsel__set_sample_bit(evsel, TIME); 1253 evsel__set_sample_bit(evsel, RAW); 1254 evsel__set_sample_bit(evsel, CPU); 1255 } 1256 1257 if (opts->sample_address) 1258 evsel__set_sample_bit(evsel, DATA_SRC); 1259 1260 if (opts->sample_phys_addr) 1261 evsel__set_sample_bit(evsel, PHYS_ADDR); 1262 1263 if (opts->no_buffering) { 1264 attr->watermark = 0; 1265 attr->wakeup_events = 1; 1266 } 1267 if (opts->branch_stack && !evsel->no_aux_samples) { 1268 evsel__set_sample_bit(evsel, BRANCH_STACK); 1269 attr->branch_sample_type = opts->branch_stack; 1270 } 1271 1272 if (opts->sample_weight) 1273 arch_evsel__set_sample_weight(evsel); 1274 1275 attr->task = track; 1276 attr->mmap = track; 1277 attr->mmap2 = track && !perf_missing_features.mmap2; 1278 attr->comm = track; 1279 attr->build_id = track && opts->build_id; 1280 1281 /* 1282 * ksymbol is tracked separately with text poke because it needs to be 1283 * system wide and enabled immediately. 1284 */ 1285 if (!opts->text_poke) 1286 attr->ksymbol = track && !perf_missing_features.ksymbol; 1287 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1288 1289 if (opts->record_namespaces) 1290 attr->namespaces = track; 1291 1292 if (opts->record_cgroup) { 1293 attr->cgroup = track && !perf_missing_features.cgroup; 1294 evsel__set_sample_bit(evsel, CGROUP); 1295 } 1296 1297 if (opts->sample_data_page_size) 1298 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); 1299 1300 if (opts->sample_code_page_size) 1301 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); 1302 1303 if (opts->record_switch_events) 1304 attr->context_switch = track; 1305 1306 if (opts->sample_transaction) 1307 evsel__set_sample_bit(evsel, TRANSACTION); 1308 1309 if (opts->running_time) { 1310 evsel->core.attr.read_format |= 1311 PERF_FORMAT_TOTAL_TIME_ENABLED | 1312 PERF_FORMAT_TOTAL_TIME_RUNNING; 1313 } 1314 1315 /* 1316 * XXX see the function comment above 1317 * 1318 * Disabling only independent events or group leaders, 1319 * keeping group members enabled. 1320 */ 1321 if (evsel__is_group_leader(evsel)) 1322 attr->disabled = 1; 1323 1324 /* 1325 * Setting enable_on_exec for independent events and 1326 * group leaders for traced executed by perf. 1327 */ 1328 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1329 !opts->initial_delay) 1330 attr->enable_on_exec = 1; 1331 1332 if (evsel->immediate) { 1333 attr->disabled = 0; 1334 attr->enable_on_exec = 0; 1335 } 1336 1337 clockid = opts->clockid; 1338 if (opts->use_clockid) { 1339 attr->use_clockid = 1; 1340 attr->clockid = opts->clockid; 1341 } 1342 1343 if (evsel->precise_max) 1344 attr->precise_ip = 3; 1345 1346 if (opts->all_user) { 1347 attr->exclude_kernel = 1; 1348 attr->exclude_user = 0; 1349 } 1350 1351 if (opts->all_kernel) { 1352 attr->exclude_kernel = 0; 1353 attr->exclude_user = 1; 1354 } 1355 1356 if (evsel->core.own_cpus || evsel->unit) 1357 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1358 1359 /* 1360 * Apply event specific term settings, 1361 * it overloads any global configuration. 1362 */ 1363 evsel__apply_config_terms(evsel, opts, track); 1364 1365 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1366 1367 /* The --period option takes the precedence. */ 1368 if (opts->period_set) { 1369 if (opts->period) 1370 evsel__set_sample_bit(evsel, PERIOD); 1371 else 1372 evsel__reset_sample_bit(evsel, PERIOD); 1373 } 1374 1375 /* 1376 * A dummy event never triggers any actual counter and therefore 1377 * cannot be used with branch_stack. 1378 * 1379 * For initial_delay, a dummy event is added implicitly. 1380 * The software event will trigger -EOPNOTSUPP error out, 1381 * if BRANCH_STACK bit is set. 1382 */ 1383 if (evsel__is_dummy_event(evsel)) 1384 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1385 1386 if (evsel__is_offcpu_event(evsel)) 1387 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; 1388 1389 arch__post_evsel_config(evsel, attr); 1390 } 1391 1392 int evsel__set_filter(struct evsel *evsel, const char *filter) 1393 { 1394 char *new_filter = strdup(filter); 1395 1396 if (new_filter != NULL) { 1397 free(evsel->filter); 1398 evsel->filter = new_filter; 1399 return 0; 1400 } 1401 1402 return -1; 1403 } 1404 1405 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1406 { 1407 char *new_filter; 1408 1409 if (evsel->filter == NULL) 1410 return evsel__set_filter(evsel, filter); 1411 1412 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1413 free(evsel->filter); 1414 evsel->filter = new_filter; 1415 return 0; 1416 } 1417 1418 return -1; 1419 } 1420 1421 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1422 { 1423 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1424 } 1425 1426 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1427 { 1428 return evsel__append_filter(evsel, "%s,%s", filter); 1429 } 1430 1431 /* Caller has to clear disabled after going through all CPUs. */ 1432 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx) 1433 { 1434 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); 1435 } 1436 1437 int evsel__enable(struct evsel *evsel) 1438 { 1439 int err = perf_evsel__enable(&evsel->core); 1440 1441 if (!err) 1442 evsel->disabled = false; 1443 return err; 1444 } 1445 1446 /* Caller has to set disabled after going through all CPUs. */ 1447 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx) 1448 { 1449 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); 1450 } 1451 1452 int evsel__disable(struct evsel *evsel) 1453 { 1454 int err = perf_evsel__disable(&evsel->core); 1455 /* 1456 * We mark it disabled here so that tools that disable a event can 1457 * ignore events after they disable it. I.e. the ring buffer may have 1458 * already a few more events queued up before the kernel got the stop 1459 * request. 1460 */ 1461 if (!err) 1462 evsel->disabled = true; 1463 1464 return err; 1465 } 1466 1467 void free_config_terms(struct list_head *config_terms) 1468 { 1469 struct evsel_config_term *term, *h; 1470 1471 list_for_each_entry_safe(term, h, config_terms, list) { 1472 list_del_init(&term->list); 1473 if (term->free_str) 1474 zfree(&term->val.str); 1475 free(term); 1476 } 1477 } 1478 1479 static void evsel__free_config_terms(struct evsel *evsel) 1480 { 1481 free_config_terms(&evsel->config_terms); 1482 } 1483 1484 void evsel__exit(struct evsel *evsel) 1485 { 1486 assert(list_empty(&evsel->core.node)); 1487 assert(evsel->evlist == NULL); 1488 bpf_counter__destroy(evsel); 1489 evsel__free_counts(evsel); 1490 perf_evsel__free_fd(&evsel->core); 1491 perf_evsel__free_id(&evsel->core); 1492 evsel__free_config_terms(evsel); 1493 cgroup__put(evsel->cgrp); 1494 perf_cpu_map__put(evsel->core.cpus); 1495 perf_cpu_map__put(evsel->core.own_cpus); 1496 perf_thread_map__put(evsel->core.threads); 1497 zfree(&evsel->group_name); 1498 zfree(&evsel->name); 1499 zfree(&evsel->pmu_name); 1500 zfree(&evsel->unit); 1501 zfree(&evsel->metric_id); 1502 evsel__zero_per_pkg(evsel); 1503 hashmap__free(evsel->per_pkg_mask); 1504 evsel->per_pkg_mask = NULL; 1505 zfree(&evsel->metric_events); 1506 perf_evsel__object.fini(evsel); 1507 } 1508 1509 void evsel__delete(struct evsel *evsel) 1510 { 1511 evsel__exit(evsel); 1512 free(evsel); 1513 } 1514 1515 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread, 1516 struct perf_counts_values *count) 1517 { 1518 struct perf_counts_values tmp; 1519 1520 if (!evsel->prev_raw_counts) 1521 return; 1522 1523 if (cpu_map_idx == -1) { 1524 tmp = evsel->prev_raw_counts->aggr; 1525 evsel->prev_raw_counts->aggr = *count; 1526 } else { 1527 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); 1528 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; 1529 } 1530 1531 count->val = count->val - tmp.val; 1532 count->ena = count->ena - tmp.ena; 1533 count->run = count->run - tmp.run; 1534 } 1535 1536 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) 1537 { 1538 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); 1539 1540 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); 1541 } 1542 1543 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, 1544 u64 val, u64 ena, u64 run, u64 lost) 1545 { 1546 struct perf_counts_values *count; 1547 1548 count = perf_counts(counter->counts, cpu_map_idx, thread); 1549 1550 count->val = val; 1551 count->ena = ena; 1552 count->run = run; 1553 count->lost = lost; 1554 1555 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1556 } 1557 1558 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) 1559 { 1560 u64 read_format = leader->core.attr.read_format; 1561 struct sample_read_value *v; 1562 u64 nr, ena = 0, run = 0, lost = 0; 1563 1564 nr = *data++; 1565 1566 if (nr != (u64) leader->core.nr_members) 1567 return -EINVAL; 1568 1569 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1570 ena = *data++; 1571 1572 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1573 run = *data++; 1574 1575 v = (void *)data; 1576 sample_read_group__for_each(v, nr, read_format) { 1577 struct evsel *counter; 1578 1579 counter = evlist__id2evsel(leader->evlist, v->id); 1580 if (!counter) 1581 return -EINVAL; 1582 1583 if (read_format & PERF_FORMAT_LOST) 1584 lost = v->lost; 1585 1586 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); 1587 } 1588 1589 return 0; 1590 } 1591 1592 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread) 1593 { 1594 struct perf_stat_evsel *ps = leader->stats; 1595 u64 read_format = leader->core.attr.read_format; 1596 int size = perf_evsel__read_size(&leader->core); 1597 u64 *data = ps->group_data; 1598 1599 if (!(read_format & PERF_FORMAT_ID)) 1600 return -EINVAL; 1601 1602 if (!evsel__is_group_leader(leader)) 1603 return -EINVAL; 1604 1605 if (!data) { 1606 data = zalloc(size); 1607 if (!data) 1608 return -ENOMEM; 1609 1610 ps->group_data = data; 1611 } 1612 1613 if (FD(leader, cpu_map_idx, thread) < 0) 1614 return -EINVAL; 1615 1616 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) 1617 return -errno; 1618 1619 return evsel__process_group_data(leader, cpu_map_idx, thread, data); 1620 } 1621 1622 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) 1623 { 1624 u64 read_format = evsel->core.attr.read_format; 1625 1626 if (read_format & PERF_FORMAT_GROUP) 1627 return evsel__read_group(evsel, cpu_map_idx, thread); 1628 1629 return evsel__read_one(evsel, cpu_map_idx, thread); 1630 } 1631 1632 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) 1633 { 1634 struct perf_counts_values count; 1635 size_t nv = scale ? 3 : 1; 1636 1637 if (FD(evsel, cpu_map_idx, thread) < 0) 1638 return -EINVAL; 1639 1640 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) 1641 return -ENOMEM; 1642 1643 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) 1644 return -errno; 1645 1646 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); 1647 perf_counts_values__scale(&count, scale, NULL); 1648 *perf_counts(evsel->counts, cpu_map_idx, thread) = count; 1649 return 0; 1650 } 1651 1652 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, 1653 int cpu_map_idx) 1654 { 1655 struct perf_cpu cpu; 1656 1657 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); 1658 return perf_cpu_map__idx(other->core.cpus, cpu); 1659 } 1660 1661 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) 1662 { 1663 struct evsel *leader = evsel__leader(evsel); 1664 1665 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || 1666 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { 1667 return evsel__match_other_cpu(evsel, leader, cpu_map_idx); 1668 } 1669 1670 return cpu_map_idx; 1671 } 1672 1673 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) 1674 { 1675 struct evsel *leader = evsel__leader(evsel); 1676 int fd; 1677 1678 if (evsel__is_group_leader(evsel)) 1679 return -1; 1680 1681 /* 1682 * Leader must be already processed/open, 1683 * if not it's a bug. 1684 */ 1685 BUG_ON(!leader->core.fd); 1686 1687 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); 1688 if (cpu_map_idx == -1) 1689 return -1; 1690 1691 fd = FD(leader, cpu_map_idx, thread); 1692 BUG_ON(fd == -1); 1693 1694 return fd; 1695 } 1696 1697 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx) 1698 { 1699 for (int cpu = 0; cpu < nr_cpus; cpu++) 1700 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1701 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1702 } 1703 1704 static int update_fds(struct evsel *evsel, 1705 int nr_cpus, int cpu_map_idx, 1706 int nr_threads, int thread_idx) 1707 { 1708 struct evsel *pos; 1709 1710 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) 1711 return -EINVAL; 1712 1713 evlist__for_each_entry(evsel->evlist, pos) { 1714 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; 1715 1716 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1717 1718 /* 1719 * Since fds for next evsel has not been created, 1720 * there is no need to iterate whole event list. 1721 */ 1722 if (pos == evsel) 1723 break; 1724 } 1725 return 0; 1726 } 1727 1728 static bool evsel__ignore_missing_thread(struct evsel *evsel, 1729 int nr_cpus, int cpu_map_idx, 1730 struct perf_thread_map *threads, 1731 int thread, int err) 1732 { 1733 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1734 1735 if (!evsel->ignore_missing_thread) 1736 return false; 1737 1738 /* The system wide setup does not work with threads. */ 1739 if (evsel->core.system_wide) 1740 return false; 1741 1742 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1743 if (err != -ESRCH) 1744 return false; 1745 1746 /* If there's only one thread, let it fail. */ 1747 if (threads->nr == 1) 1748 return false; 1749 1750 /* 1751 * We should remove fd for missing_thread first 1752 * because thread_map__remove() will decrease threads->nr. 1753 */ 1754 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread)) 1755 return false; 1756 1757 if (thread_map__remove(threads, thread)) 1758 return false; 1759 1760 pr_warning("WARNING: Ignored open failure for pid %d\n", 1761 ignore_pid); 1762 return true; 1763 } 1764 1765 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1766 void *priv __maybe_unused) 1767 { 1768 return fprintf(fp, " %-32s %s\n", name, val); 1769 } 1770 1771 static void display_attr(struct perf_event_attr *attr) 1772 { 1773 if (verbose >= 2 || debug_peo_args) { 1774 fprintf(stderr, "%.60s\n", graph_dotted_line); 1775 fprintf(stderr, "perf_event_attr:\n"); 1776 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 1777 fprintf(stderr, "%.60s\n", graph_dotted_line); 1778 } 1779 } 1780 1781 bool evsel__precise_ip_fallback(struct evsel *evsel) 1782 { 1783 /* Do not try less precise if not requested. */ 1784 if (!evsel->precise_max) 1785 return false; 1786 1787 /* 1788 * We tried all the precise_ip values, and it's 1789 * still failing, so leave it to standard fallback. 1790 */ 1791 if (!evsel->core.attr.precise_ip) { 1792 evsel->core.attr.precise_ip = evsel->precise_ip_original; 1793 return false; 1794 } 1795 1796 if (!evsel->precise_ip_original) 1797 evsel->precise_ip_original = evsel->core.attr.precise_ip; 1798 1799 evsel->core.attr.precise_ip--; 1800 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 1801 display_attr(&evsel->core.attr); 1802 return true; 1803 } 1804 1805 static struct perf_cpu_map *empty_cpu_map; 1806 static struct perf_thread_map *empty_thread_map; 1807 1808 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 1809 struct perf_thread_map *threads) 1810 { 1811 int nthreads; 1812 1813 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 1814 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 1815 return -EINVAL; 1816 1817 if (cpus == NULL) { 1818 if (empty_cpu_map == NULL) { 1819 empty_cpu_map = perf_cpu_map__dummy_new(); 1820 if (empty_cpu_map == NULL) 1821 return -ENOMEM; 1822 } 1823 1824 cpus = empty_cpu_map; 1825 } 1826 1827 if (threads == NULL) { 1828 if (empty_thread_map == NULL) { 1829 empty_thread_map = thread_map__new_by_tid(-1); 1830 if (empty_thread_map == NULL) 1831 return -ENOMEM; 1832 } 1833 1834 threads = empty_thread_map; 1835 } 1836 1837 if (evsel->core.system_wide) 1838 nthreads = 1; 1839 else 1840 nthreads = threads->nr; 1841 1842 if (evsel->core.fd == NULL && 1843 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) 1844 return -ENOMEM; 1845 1846 evsel->open_flags = PERF_FLAG_FD_CLOEXEC; 1847 if (evsel->cgrp) 1848 evsel->open_flags |= PERF_FLAG_PID_CGROUP; 1849 1850 return 0; 1851 } 1852 1853 static void evsel__disable_missing_features(struct evsel *evsel) 1854 { 1855 if (perf_missing_features.weight_struct) { 1856 evsel__set_sample_bit(evsel, WEIGHT); 1857 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT); 1858 } 1859 if (perf_missing_features.clockid_wrong) 1860 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1861 if (perf_missing_features.clockid) { 1862 evsel->core.attr.use_clockid = 0; 1863 evsel->core.attr.clockid = 0; 1864 } 1865 if (perf_missing_features.cloexec) 1866 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1867 if (perf_missing_features.mmap2) 1868 evsel->core.attr.mmap2 = 0; 1869 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest) 1870 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 1871 if (perf_missing_features.lbr_flags) 1872 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 1873 PERF_SAMPLE_BRANCH_NO_CYCLES); 1874 if (perf_missing_features.group_read && evsel->core.attr.inherit) 1875 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 1876 if (perf_missing_features.ksymbol) 1877 evsel->core.attr.ksymbol = 0; 1878 if (perf_missing_features.bpf) 1879 evsel->core.attr.bpf_event = 0; 1880 if (perf_missing_features.branch_hw_idx) 1881 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX; 1882 if (perf_missing_features.sample_id_all) 1883 evsel->core.attr.sample_id_all = 0; 1884 } 1885 1886 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 1887 struct perf_thread_map *threads) 1888 { 1889 int err; 1890 1891 err = __evsel__prepare_open(evsel, cpus, threads); 1892 if (err) 1893 return err; 1894 1895 evsel__disable_missing_features(evsel); 1896 1897 return err; 1898 } 1899 1900 bool evsel__detect_missing_features(struct evsel *evsel) 1901 { 1902 /* 1903 * Must probe features in the order they were added to the 1904 * perf_event_attr interface. 1905 */ 1906 if (!perf_missing_features.weight_struct && 1907 (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { 1908 perf_missing_features.weight_struct = true; 1909 pr_debug2("switching off weight struct support\n"); 1910 return true; 1911 } else if (!perf_missing_features.code_page_size && 1912 (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { 1913 perf_missing_features.code_page_size = true; 1914 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); 1915 return false; 1916 } else if (!perf_missing_features.data_page_size && 1917 (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { 1918 perf_missing_features.data_page_size = true; 1919 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); 1920 return false; 1921 } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { 1922 perf_missing_features.cgroup = true; 1923 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); 1924 return false; 1925 } else if (!perf_missing_features.branch_hw_idx && 1926 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { 1927 perf_missing_features.branch_hw_idx = true; 1928 pr_debug2("switching off branch HW index support\n"); 1929 return true; 1930 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 1931 perf_missing_features.aux_output = true; 1932 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); 1933 return false; 1934 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 1935 perf_missing_features.bpf = true; 1936 pr_debug2_peo("switching off bpf_event\n"); 1937 return true; 1938 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 1939 perf_missing_features.ksymbol = true; 1940 pr_debug2_peo("switching off ksymbol\n"); 1941 return true; 1942 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 1943 perf_missing_features.write_backward = true; 1944 pr_debug2_peo("switching off write_backward\n"); 1945 return false; 1946 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 1947 perf_missing_features.clockid_wrong = true; 1948 pr_debug2_peo("switching off clockid\n"); 1949 return true; 1950 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 1951 perf_missing_features.clockid = true; 1952 pr_debug2_peo("switching off use_clockid\n"); 1953 return true; 1954 } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { 1955 perf_missing_features.cloexec = true; 1956 pr_debug2_peo("switching off cloexec flag\n"); 1957 return true; 1958 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 1959 perf_missing_features.mmap2 = true; 1960 pr_debug2_peo("switching off mmap2\n"); 1961 return true; 1962 } else if ((evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) && 1963 (evsel->pmu == NULL || evsel->pmu->missing_features.exclude_guest)) { 1964 if (evsel->pmu == NULL) { 1965 evsel->pmu = evsel__find_pmu(evsel); 1966 if (evsel->pmu) 1967 evsel->pmu->missing_features.exclude_guest = true; 1968 else { 1969 /* we cannot find PMU, disable attrs now */ 1970 evsel->core.attr.exclude_host = false; 1971 evsel->core.attr.exclude_guest = false; 1972 } 1973 } 1974 1975 if (evsel->exclude_GH) { 1976 pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n"); 1977 return false; 1978 } 1979 if (!perf_missing_features.exclude_guest) { 1980 perf_missing_features.exclude_guest = true; 1981 pr_debug2_peo("switching off exclude_guest, exclude_host\n"); 1982 } 1983 return true; 1984 } else if (!perf_missing_features.sample_id_all) { 1985 perf_missing_features.sample_id_all = true; 1986 pr_debug2_peo("switching off sample_id_all\n"); 1987 return true; 1988 } else if (!perf_missing_features.lbr_flags && 1989 (evsel->core.attr.branch_sample_type & 1990 (PERF_SAMPLE_BRANCH_NO_CYCLES | 1991 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 1992 perf_missing_features.lbr_flags = true; 1993 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 1994 return true; 1995 } else if (!perf_missing_features.group_read && 1996 evsel->core.attr.inherit && 1997 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 1998 evsel__is_group_leader(evsel)) { 1999 perf_missing_features.group_read = true; 2000 pr_debug2_peo("switching off group read\n"); 2001 return true; 2002 } else { 2003 return false; 2004 } 2005 } 2006 2007 bool evsel__increase_rlimit(enum rlimit_action *set_rlimit) 2008 { 2009 int old_errno; 2010 struct rlimit l; 2011 2012 if (*set_rlimit < INCREASED_MAX) { 2013 old_errno = errno; 2014 2015 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 2016 if (*set_rlimit == NO_CHANGE) { 2017 l.rlim_cur = l.rlim_max; 2018 } else { 2019 l.rlim_cur = l.rlim_max + 1000; 2020 l.rlim_max = l.rlim_cur; 2021 } 2022 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 2023 (*set_rlimit) += 1; 2024 errno = old_errno; 2025 return true; 2026 } 2027 } 2028 errno = old_errno; 2029 } 2030 2031 return false; 2032 } 2033 2034 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 2035 struct perf_thread_map *threads, 2036 int start_cpu_map_idx, int end_cpu_map_idx) 2037 { 2038 int idx, thread, nthreads; 2039 int pid = -1, err, old_errno; 2040 enum rlimit_action set_rlimit = NO_CHANGE; 2041 2042 err = __evsel__prepare_open(evsel, cpus, threads); 2043 if (err) 2044 return err; 2045 2046 if (cpus == NULL) 2047 cpus = empty_cpu_map; 2048 2049 if (threads == NULL) 2050 threads = empty_thread_map; 2051 2052 if (evsel->core.system_wide) 2053 nthreads = 1; 2054 else 2055 nthreads = threads->nr; 2056 2057 if (evsel->cgrp) 2058 pid = evsel->cgrp->fd; 2059 2060 fallback_missing_features: 2061 evsel__disable_missing_features(evsel); 2062 2063 display_attr(&evsel->core.attr); 2064 2065 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { 2066 2067 for (thread = 0; thread < nthreads; thread++) { 2068 int fd, group_fd; 2069 retry_open: 2070 if (thread >= nthreads) 2071 break; 2072 2073 if (!evsel->cgrp && !evsel->core.system_wide) 2074 pid = perf_thread_map__pid(threads, thread); 2075 2076 group_fd = get_group_fd(evsel, idx, thread); 2077 2078 test_attr__ready(); 2079 2080 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 2081 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags); 2082 2083 fd = sys_perf_event_open(&evsel->core.attr, pid, 2084 perf_cpu_map__cpu(cpus, idx).cpu, 2085 group_fd, evsel->open_flags); 2086 2087 FD(evsel, idx, thread) = fd; 2088 2089 if (fd < 0) { 2090 err = -errno; 2091 2092 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 2093 err); 2094 goto try_fallback; 2095 } 2096 2097 bpf_counter__install_pe(evsel, idx, fd); 2098 2099 if (unlikely(test_attr__enabled)) { 2100 test_attr__open(&evsel->core.attr, pid, 2101 perf_cpu_map__cpu(cpus, idx), 2102 fd, group_fd, evsel->open_flags); 2103 } 2104 2105 pr_debug2_peo(" = %d\n", fd); 2106 2107 if (evsel->bpf_fd >= 0) { 2108 int evt_fd = fd; 2109 int bpf_fd = evsel->bpf_fd; 2110 2111 err = ioctl(evt_fd, 2112 PERF_EVENT_IOC_SET_BPF, 2113 bpf_fd); 2114 if (err && errno != EEXIST) { 2115 pr_err("failed to attach bpf fd %d: %s\n", 2116 bpf_fd, strerror(errno)); 2117 err = -EINVAL; 2118 goto out_close; 2119 } 2120 } 2121 2122 set_rlimit = NO_CHANGE; 2123 2124 /* 2125 * If we succeeded but had to kill clockid, fail and 2126 * have evsel__open_strerror() print us a nice error. 2127 */ 2128 if (perf_missing_features.clockid || 2129 perf_missing_features.clockid_wrong) { 2130 err = -EINVAL; 2131 goto out_close; 2132 } 2133 } 2134 } 2135 2136 return 0; 2137 2138 try_fallback: 2139 if (evsel__precise_ip_fallback(evsel)) 2140 goto retry_open; 2141 2142 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), 2143 idx, threads, thread, err)) { 2144 /* We just removed 1 thread, so lower the upper nthreads limit. */ 2145 nthreads--; 2146 2147 /* ... and pretend like nothing have happened. */ 2148 err = 0; 2149 goto retry_open; 2150 } 2151 /* 2152 * perf stat needs between 5 and 22 fds per CPU. When we run out 2153 * of them try to increase the limits. 2154 */ 2155 if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit)) 2156 goto retry_open; 2157 2158 if (err != -EINVAL || idx > 0 || thread > 0) 2159 goto out_close; 2160 2161 if (evsel__detect_missing_features(evsel)) 2162 goto fallback_missing_features; 2163 out_close: 2164 if (err) 2165 threads->err_thread = thread; 2166 2167 old_errno = errno; 2168 do { 2169 while (--thread >= 0) { 2170 if (FD(evsel, idx, thread) >= 0) 2171 close(FD(evsel, idx, thread)); 2172 FD(evsel, idx, thread) = -1; 2173 } 2174 thread = nthreads; 2175 } while (--idx >= 0); 2176 errno = old_errno; 2177 return err; 2178 } 2179 2180 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 2181 struct perf_thread_map *threads) 2182 { 2183 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2184 } 2185 2186 void evsel__close(struct evsel *evsel) 2187 { 2188 perf_evsel__close(&evsel->core); 2189 perf_evsel__free_id(&evsel->core); 2190 } 2191 2192 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx) 2193 { 2194 if (cpu_map_idx == -1) 2195 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus)); 2196 2197 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1); 2198 } 2199 2200 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 2201 { 2202 return evsel__open(evsel, NULL, threads); 2203 } 2204 2205 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 2206 const union perf_event *event, 2207 struct perf_sample *sample) 2208 { 2209 u64 type = evsel->core.attr.sample_type; 2210 const __u64 *array = event->sample.array; 2211 bool swapped = evsel->needs_swap; 2212 union u64_swap u; 2213 2214 array += ((event->header.size - 2215 sizeof(event->header)) / sizeof(u64)) - 1; 2216 2217 if (type & PERF_SAMPLE_IDENTIFIER) { 2218 sample->id = *array; 2219 array--; 2220 } 2221 2222 if (type & PERF_SAMPLE_CPU) { 2223 u.val64 = *array; 2224 if (swapped) { 2225 /* undo swap of u64, then swap on individual u32s */ 2226 u.val64 = bswap_64(u.val64); 2227 u.val32[0] = bswap_32(u.val32[0]); 2228 } 2229 2230 sample->cpu = u.val32[0]; 2231 array--; 2232 } 2233 2234 if (type & PERF_SAMPLE_STREAM_ID) { 2235 sample->stream_id = *array; 2236 array--; 2237 } 2238 2239 if (type & PERF_SAMPLE_ID) { 2240 sample->id = *array; 2241 array--; 2242 } 2243 2244 if (type & PERF_SAMPLE_TIME) { 2245 sample->time = *array; 2246 array--; 2247 } 2248 2249 if (type & PERF_SAMPLE_TID) { 2250 u.val64 = *array; 2251 if (swapped) { 2252 /* undo swap of u64, then swap on individual u32s */ 2253 u.val64 = bswap_64(u.val64); 2254 u.val32[0] = bswap_32(u.val32[0]); 2255 u.val32[1] = bswap_32(u.val32[1]); 2256 } 2257 2258 sample->pid = u.val32[0]; 2259 sample->tid = u.val32[1]; 2260 array--; 2261 } 2262 2263 return 0; 2264 } 2265 2266 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 2267 u64 size) 2268 { 2269 return size > max_size || offset + size > endp; 2270 } 2271 2272 #define OVERFLOW_CHECK(offset, size, max_size) \ 2273 do { \ 2274 if (overflow(endp, (max_size), (offset), (size))) \ 2275 return -EFAULT; \ 2276 } while (0) 2277 2278 #define OVERFLOW_CHECK_u64(offset) \ 2279 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 2280 2281 static int 2282 perf_event__check_size(union perf_event *event, unsigned int sample_size) 2283 { 2284 /* 2285 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 2286 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 2287 * check the format does not go past the end of the event. 2288 */ 2289 if (sample_size + sizeof(event->header) > event->header.size) 2290 return -EFAULT; 2291 2292 return 0; 2293 } 2294 2295 void __weak arch_perf_parse_sample_weight(struct perf_sample *data, 2296 const __u64 *array, 2297 u64 type __maybe_unused) 2298 { 2299 data->weight = *array; 2300 } 2301 2302 u64 evsel__bitfield_swap_branch_flags(u64 value) 2303 { 2304 u64 new_val = 0; 2305 2306 /* 2307 * branch_flags 2308 * union { 2309 * u64 values; 2310 * struct { 2311 * mispred:1 //target mispredicted 2312 * predicted:1 //target predicted 2313 * in_tx:1 //in transaction 2314 * abort:1 //transaction abort 2315 * cycles:16 //cycle count to last branch 2316 * type:4 //branch type 2317 * reserved:40 2318 * } 2319 * } 2320 * 2321 * Avoid bswap64() the entire branch_flag.value, 2322 * as it has variable bit-field sizes. Instead the 2323 * macro takes the bit-field position/size, 2324 * swaps it based on the host endianness. 2325 * 2326 * tep_is_bigendian() is used here instead of 2327 * bigendian() to avoid python test fails. 2328 */ 2329 if (tep_is_bigendian()) { 2330 new_val = bitfield_swap(value, 0, 1); 2331 new_val |= bitfield_swap(value, 1, 1); 2332 new_val |= bitfield_swap(value, 2, 1); 2333 new_val |= bitfield_swap(value, 3, 1); 2334 new_val |= bitfield_swap(value, 4, 16); 2335 new_val |= bitfield_swap(value, 20, 4); 2336 new_val |= bitfield_swap(value, 24, 40); 2337 } else { 2338 new_val = bitfield_swap(value, 63, 1); 2339 new_val |= bitfield_swap(value, 62, 1); 2340 new_val |= bitfield_swap(value, 61, 1); 2341 new_val |= bitfield_swap(value, 60, 1); 2342 new_val |= bitfield_swap(value, 44, 16); 2343 new_val |= bitfield_swap(value, 40, 4); 2344 new_val |= bitfield_swap(value, 0, 40); 2345 } 2346 2347 return new_val; 2348 } 2349 2350 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 2351 struct perf_sample *data) 2352 { 2353 u64 type = evsel->core.attr.sample_type; 2354 bool swapped = evsel->needs_swap; 2355 const __u64 *array; 2356 u16 max_size = event->header.size; 2357 const void *endp = (void *)event + max_size; 2358 u64 sz; 2359 2360 /* 2361 * used for cross-endian analysis. See git commit 65014ab3 2362 * for why this goofiness is needed. 2363 */ 2364 union u64_swap u; 2365 2366 memset(data, 0, sizeof(*data)); 2367 data->cpu = data->pid = data->tid = -1; 2368 data->stream_id = data->id = data->time = -1ULL; 2369 data->period = evsel->core.attr.sample_period; 2370 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 2371 data->misc = event->header.misc; 2372 data->id = -1ULL; 2373 data->data_src = PERF_MEM_DATA_SRC_NONE; 2374 data->vcpu = -1; 2375 2376 if (event->header.type != PERF_RECORD_SAMPLE) { 2377 if (!evsel->core.attr.sample_id_all) 2378 return 0; 2379 return perf_evsel__parse_id_sample(evsel, event, data); 2380 } 2381 2382 array = event->sample.array; 2383 2384 if (perf_event__check_size(event, evsel->sample_size)) 2385 return -EFAULT; 2386 2387 if (type & PERF_SAMPLE_IDENTIFIER) { 2388 data->id = *array; 2389 array++; 2390 } 2391 2392 if (type & PERF_SAMPLE_IP) { 2393 data->ip = *array; 2394 array++; 2395 } 2396 2397 if (type & PERF_SAMPLE_TID) { 2398 u.val64 = *array; 2399 if (swapped) { 2400 /* undo swap of u64, then swap on individual u32s */ 2401 u.val64 = bswap_64(u.val64); 2402 u.val32[0] = bswap_32(u.val32[0]); 2403 u.val32[1] = bswap_32(u.val32[1]); 2404 } 2405 2406 data->pid = u.val32[0]; 2407 data->tid = u.val32[1]; 2408 array++; 2409 } 2410 2411 if (type & PERF_SAMPLE_TIME) { 2412 data->time = *array; 2413 array++; 2414 } 2415 2416 if (type & PERF_SAMPLE_ADDR) { 2417 data->addr = *array; 2418 array++; 2419 } 2420 2421 if (type & PERF_SAMPLE_ID) { 2422 data->id = *array; 2423 array++; 2424 } 2425 2426 if (type & PERF_SAMPLE_STREAM_ID) { 2427 data->stream_id = *array; 2428 array++; 2429 } 2430 2431 if (type & PERF_SAMPLE_CPU) { 2432 2433 u.val64 = *array; 2434 if (swapped) { 2435 /* undo swap of u64, then swap on individual u32s */ 2436 u.val64 = bswap_64(u.val64); 2437 u.val32[0] = bswap_32(u.val32[0]); 2438 } 2439 2440 data->cpu = u.val32[0]; 2441 array++; 2442 } 2443 2444 if (type & PERF_SAMPLE_PERIOD) { 2445 data->period = *array; 2446 array++; 2447 } 2448 2449 if (type & PERF_SAMPLE_READ) { 2450 u64 read_format = evsel->core.attr.read_format; 2451 2452 OVERFLOW_CHECK_u64(array); 2453 if (read_format & PERF_FORMAT_GROUP) 2454 data->read.group.nr = *array; 2455 else 2456 data->read.one.value = *array; 2457 2458 array++; 2459 2460 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2461 OVERFLOW_CHECK_u64(array); 2462 data->read.time_enabled = *array; 2463 array++; 2464 } 2465 2466 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2467 OVERFLOW_CHECK_u64(array); 2468 data->read.time_running = *array; 2469 array++; 2470 } 2471 2472 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2473 if (read_format & PERF_FORMAT_GROUP) { 2474 const u64 max_group_nr = UINT64_MAX / 2475 sizeof(struct sample_read_value); 2476 2477 if (data->read.group.nr > max_group_nr) 2478 return -EFAULT; 2479 2480 sz = data->read.group.nr * sample_read_value_size(read_format); 2481 OVERFLOW_CHECK(array, sz, max_size); 2482 data->read.group.values = 2483 (struct sample_read_value *)array; 2484 array = (void *)array + sz; 2485 } else { 2486 OVERFLOW_CHECK_u64(array); 2487 data->read.one.id = *array; 2488 array++; 2489 2490 if (read_format & PERF_FORMAT_LOST) { 2491 OVERFLOW_CHECK_u64(array); 2492 data->read.one.lost = *array; 2493 array++; 2494 } 2495 } 2496 } 2497 2498 if (type & PERF_SAMPLE_CALLCHAIN) { 2499 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2500 2501 OVERFLOW_CHECK_u64(array); 2502 data->callchain = (struct ip_callchain *)array++; 2503 if (data->callchain->nr > max_callchain_nr) 2504 return -EFAULT; 2505 sz = data->callchain->nr * sizeof(u64); 2506 OVERFLOW_CHECK(array, sz, max_size); 2507 array = (void *)array + sz; 2508 } 2509 2510 if (type & PERF_SAMPLE_RAW) { 2511 OVERFLOW_CHECK_u64(array); 2512 u.val64 = *array; 2513 2514 /* 2515 * Undo swap of u64, then swap on individual u32s, 2516 * get the size of the raw area and undo all of the 2517 * swap. The pevent interface handles endianness by 2518 * itself. 2519 */ 2520 if (swapped) { 2521 u.val64 = bswap_64(u.val64); 2522 u.val32[0] = bswap_32(u.val32[0]); 2523 u.val32[1] = bswap_32(u.val32[1]); 2524 } 2525 data->raw_size = u.val32[0]; 2526 2527 /* 2528 * The raw data is aligned on 64bits including the 2529 * u32 size, so it's safe to use mem_bswap_64. 2530 */ 2531 if (swapped) 2532 mem_bswap_64((void *) array, data->raw_size); 2533 2534 array = (void *)array + sizeof(u32); 2535 2536 OVERFLOW_CHECK(array, data->raw_size, max_size); 2537 data->raw_data = (void *)array; 2538 array = (void *)array + data->raw_size; 2539 } 2540 2541 if (type & PERF_SAMPLE_BRANCH_STACK) { 2542 const u64 max_branch_nr = UINT64_MAX / 2543 sizeof(struct branch_entry); 2544 struct branch_entry *e; 2545 unsigned int i; 2546 2547 OVERFLOW_CHECK_u64(array); 2548 data->branch_stack = (struct branch_stack *)array++; 2549 2550 if (data->branch_stack->nr > max_branch_nr) 2551 return -EFAULT; 2552 2553 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2554 if (evsel__has_branch_hw_idx(evsel)) { 2555 sz += sizeof(u64); 2556 e = &data->branch_stack->entries[0]; 2557 } else { 2558 data->no_hw_idx = true; 2559 /* 2560 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, 2561 * only nr and entries[] will be output by kernel. 2562 */ 2563 e = (struct branch_entry *)&data->branch_stack->hw_idx; 2564 } 2565 2566 if (swapped) { 2567 /* 2568 * struct branch_flag does not have endian 2569 * specific bit field definition. And bswap 2570 * will not resolve the issue, since these 2571 * are bit fields. 2572 * 2573 * evsel__bitfield_swap_branch_flags() uses a 2574 * bitfield_swap macro to swap the bit position 2575 * based on the host endians. 2576 */ 2577 for (i = 0; i < data->branch_stack->nr; i++, e++) 2578 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); 2579 } 2580 2581 OVERFLOW_CHECK(array, sz, max_size); 2582 array = (void *)array + sz; 2583 } 2584 2585 if (type & PERF_SAMPLE_REGS_USER) { 2586 OVERFLOW_CHECK_u64(array); 2587 data->user_regs.abi = *array; 2588 array++; 2589 2590 if (data->user_regs.abi) { 2591 u64 mask = evsel->core.attr.sample_regs_user; 2592 2593 sz = hweight64(mask) * sizeof(u64); 2594 OVERFLOW_CHECK(array, sz, max_size); 2595 data->user_regs.mask = mask; 2596 data->user_regs.regs = (u64 *)array; 2597 array = (void *)array + sz; 2598 } 2599 } 2600 2601 if (type & PERF_SAMPLE_STACK_USER) { 2602 OVERFLOW_CHECK_u64(array); 2603 sz = *array++; 2604 2605 data->user_stack.offset = ((char *)(array - 1) 2606 - (char *) event); 2607 2608 if (!sz) { 2609 data->user_stack.size = 0; 2610 } else { 2611 OVERFLOW_CHECK(array, sz, max_size); 2612 data->user_stack.data = (char *)array; 2613 array = (void *)array + sz; 2614 OVERFLOW_CHECK_u64(array); 2615 data->user_stack.size = *array++; 2616 if (WARN_ONCE(data->user_stack.size > sz, 2617 "user stack dump failure\n")) 2618 return -EFAULT; 2619 } 2620 } 2621 2622 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 2623 OVERFLOW_CHECK_u64(array); 2624 arch_perf_parse_sample_weight(data, array, type); 2625 array++; 2626 } 2627 2628 if (type & PERF_SAMPLE_DATA_SRC) { 2629 OVERFLOW_CHECK_u64(array); 2630 data->data_src = *array; 2631 array++; 2632 } 2633 2634 if (type & PERF_SAMPLE_TRANSACTION) { 2635 OVERFLOW_CHECK_u64(array); 2636 data->transaction = *array; 2637 array++; 2638 } 2639 2640 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2641 if (type & PERF_SAMPLE_REGS_INTR) { 2642 OVERFLOW_CHECK_u64(array); 2643 data->intr_regs.abi = *array; 2644 array++; 2645 2646 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2647 u64 mask = evsel->core.attr.sample_regs_intr; 2648 2649 sz = hweight64(mask) * sizeof(u64); 2650 OVERFLOW_CHECK(array, sz, max_size); 2651 data->intr_regs.mask = mask; 2652 data->intr_regs.regs = (u64 *)array; 2653 array = (void *)array + sz; 2654 } 2655 } 2656 2657 data->phys_addr = 0; 2658 if (type & PERF_SAMPLE_PHYS_ADDR) { 2659 data->phys_addr = *array; 2660 array++; 2661 } 2662 2663 data->cgroup = 0; 2664 if (type & PERF_SAMPLE_CGROUP) { 2665 data->cgroup = *array; 2666 array++; 2667 } 2668 2669 data->data_page_size = 0; 2670 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 2671 data->data_page_size = *array; 2672 array++; 2673 } 2674 2675 data->code_page_size = 0; 2676 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 2677 data->code_page_size = *array; 2678 array++; 2679 } 2680 2681 if (type & PERF_SAMPLE_AUX) { 2682 OVERFLOW_CHECK_u64(array); 2683 sz = *array++; 2684 2685 OVERFLOW_CHECK(array, sz, max_size); 2686 /* Undo swap of data */ 2687 if (swapped) 2688 mem_bswap_64((char *)array, sz); 2689 data->aux_sample.size = sz; 2690 data->aux_sample.data = (char *)array; 2691 array = (void *)array + sz; 2692 } 2693 2694 return 0; 2695 } 2696 2697 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 2698 u64 *timestamp) 2699 { 2700 u64 type = evsel->core.attr.sample_type; 2701 const __u64 *array; 2702 2703 if (!(type & PERF_SAMPLE_TIME)) 2704 return -1; 2705 2706 if (event->header.type != PERF_RECORD_SAMPLE) { 2707 struct perf_sample data = { 2708 .time = -1ULL, 2709 }; 2710 2711 if (!evsel->core.attr.sample_id_all) 2712 return -1; 2713 if (perf_evsel__parse_id_sample(evsel, event, &data)) 2714 return -1; 2715 2716 *timestamp = data.time; 2717 return 0; 2718 } 2719 2720 array = event->sample.array; 2721 2722 if (perf_event__check_size(event, evsel->sample_size)) 2723 return -EFAULT; 2724 2725 if (type & PERF_SAMPLE_IDENTIFIER) 2726 array++; 2727 2728 if (type & PERF_SAMPLE_IP) 2729 array++; 2730 2731 if (type & PERF_SAMPLE_TID) 2732 array++; 2733 2734 if (type & PERF_SAMPLE_TIME) 2735 *timestamp = *array; 2736 2737 return 0; 2738 } 2739 2740 u16 evsel__id_hdr_size(struct evsel *evsel) 2741 { 2742 u64 sample_type = evsel->core.attr.sample_type; 2743 u16 size = 0; 2744 2745 if (sample_type & PERF_SAMPLE_TID) 2746 size += sizeof(u64); 2747 2748 if (sample_type & PERF_SAMPLE_TIME) 2749 size += sizeof(u64); 2750 2751 if (sample_type & PERF_SAMPLE_ID) 2752 size += sizeof(u64); 2753 2754 if (sample_type & PERF_SAMPLE_STREAM_ID) 2755 size += sizeof(u64); 2756 2757 if (sample_type & PERF_SAMPLE_CPU) 2758 size += sizeof(u64); 2759 2760 if (sample_type & PERF_SAMPLE_IDENTIFIER) 2761 size += sizeof(u64); 2762 2763 return size; 2764 } 2765 2766 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 2767 { 2768 return tep_find_field(evsel->tp_format, name); 2769 } 2770 2771 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 2772 { 2773 struct tep_format_field *field = evsel__field(evsel, name); 2774 int offset; 2775 2776 if (!field) 2777 return NULL; 2778 2779 offset = field->offset; 2780 2781 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 2782 offset = *(int *)(sample->raw_data + field->offset); 2783 offset &= 0xffff; 2784 if (field->flags & TEP_FIELD_IS_RELATIVE) 2785 offset += field->offset + field->size; 2786 } 2787 2788 return sample->raw_data + offset; 2789 } 2790 2791 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 2792 bool needs_swap) 2793 { 2794 u64 value; 2795 void *ptr = sample->raw_data + field->offset; 2796 2797 switch (field->size) { 2798 case 1: 2799 return *(u8 *)ptr; 2800 case 2: 2801 value = *(u16 *)ptr; 2802 break; 2803 case 4: 2804 value = *(u32 *)ptr; 2805 break; 2806 case 8: 2807 memcpy(&value, ptr, sizeof(u64)); 2808 break; 2809 default: 2810 return 0; 2811 } 2812 2813 if (!needs_swap) 2814 return value; 2815 2816 switch (field->size) { 2817 case 2: 2818 return bswap_16(value); 2819 case 4: 2820 return bswap_32(value); 2821 case 8: 2822 return bswap_64(value); 2823 default: 2824 return 0; 2825 } 2826 2827 return 0; 2828 } 2829 2830 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 2831 { 2832 struct tep_format_field *field = evsel__field(evsel, name); 2833 2834 if (!field) 2835 return 0; 2836 2837 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 2838 } 2839 2840 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize) 2841 { 2842 int paranoid; 2843 2844 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2845 evsel->core.attr.type == PERF_TYPE_HARDWARE && 2846 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2847 /* 2848 * If it's cycles then fall back to hrtimer based 2849 * cpu-clock-tick sw counter, which is always available even if 2850 * no PMU support. 2851 * 2852 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2853 * b0a873e). 2854 */ 2855 scnprintf(msg, msgsize, "%s", 2856 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2857 2858 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 2859 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK; 2860 2861 zfree(&evsel->name); 2862 return true; 2863 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 2864 (paranoid = perf_event_paranoid()) > 1) { 2865 const char *name = evsel__name(evsel); 2866 char *new_name; 2867 const char *sep = ":"; 2868 2869 /* If event has exclude user then don't exclude kernel. */ 2870 if (evsel->core.attr.exclude_user) 2871 return false; 2872 2873 /* Is there already the separator in the name. */ 2874 if (strchr(name, '/') || 2875 (strchr(name, ':') && !evsel->is_libpfm_event)) 2876 sep = ""; 2877 2878 if (asprintf(&new_name, "%s%su", name, sep) < 0) 2879 return false; 2880 2881 if (evsel->name) 2882 free(evsel->name); 2883 evsel->name = new_name; 2884 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 2885 "to fall back to excluding kernel and hypervisor " 2886 " samples", paranoid); 2887 evsel->core.attr.exclude_kernel = 1; 2888 evsel->core.attr.exclude_hv = 1; 2889 2890 return true; 2891 } 2892 2893 return false; 2894 } 2895 2896 static bool find_process(const char *name) 2897 { 2898 size_t len = strlen(name); 2899 DIR *dir; 2900 struct dirent *d; 2901 int ret = -1; 2902 2903 dir = opendir(procfs__mountpoint()); 2904 if (!dir) 2905 return false; 2906 2907 /* Walk through the directory. */ 2908 while (ret && (d = readdir(dir)) != NULL) { 2909 char path[PATH_MAX]; 2910 char *data; 2911 size_t size; 2912 2913 if ((d->d_type != DT_DIR) || 2914 !strcmp(".", d->d_name) || 2915 !strcmp("..", d->d_name)) 2916 continue; 2917 2918 scnprintf(path, sizeof(path), "%s/%s/comm", 2919 procfs__mountpoint(), d->d_name); 2920 2921 if (filename__read_str(path, &data, &size)) 2922 continue; 2923 2924 ret = strncmp(name, data, len); 2925 free(data); 2926 } 2927 2928 closedir(dir); 2929 return ret ? false : true; 2930 } 2931 2932 static bool is_amd(const char *arch, const char *cpuid) 2933 { 2934 return arch && !strcmp("x86", arch) && cpuid && strstarts(cpuid, "AuthenticAMD"); 2935 } 2936 2937 static bool is_amd_ibs(struct evsel *evsel) 2938 { 2939 return evsel->core.attr.precise_ip 2940 || (evsel->pmu_name && !strncmp(evsel->pmu_name, "ibs", 3)); 2941 } 2942 2943 int evsel__open_strerror(struct evsel *evsel, struct target *target, 2944 int err, char *msg, size_t size) 2945 { 2946 struct perf_env *env = evsel__env(evsel); 2947 const char *arch = perf_env__arch(env); 2948 const char *cpuid = perf_env__cpuid(env); 2949 char sbuf[STRERR_BUFSIZE]; 2950 int printed = 0, enforced = 0; 2951 2952 switch (err) { 2953 case EPERM: 2954 case EACCES: 2955 printed += scnprintf(msg + printed, size - printed, 2956 "Access to performance monitoring and observability operations is limited.\n"); 2957 2958 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 2959 if (enforced) { 2960 printed += scnprintf(msg + printed, size - printed, 2961 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 2962 "monitoring and observability operations. Inspect system audit records for\n" 2963 "more perf_event access control information and adjusting the policy.\n"); 2964 } 2965 } 2966 2967 if (err == EPERM) 2968 printed += scnprintf(msg, size, 2969 "No permission to enable %s event.\n\n", evsel__name(evsel)); 2970 2971 return scnprintf(msg + printed, size - printed, 2972 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 2973 "access to performance monitoring and observability operations for processes\n" 2974 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 2975 "More information can be found at 'Perf events and tool security' document:\n" 2976 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 2977 "perf_event_paranoid setting is %d:\n" 2978 " -1: Allow use of (almost) all events by all users\n" 2979 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 2980 ">= 0: Disallow raw and ftrace function tracepoint access\n" 2981 ">= 1: Disallow CPU event access\n" 2982 ">= 2: Disallow kernel profiling\n" 2983 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 2984 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 2985 perf_event_paranoid()); 2986 case ENOENT: 2987 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 2988 case EMFILE: 2989 return scnprintf(msg, size, "%s", 2990 "Too many events are opened.\n" 2991 "Probably the maximum number of open file descriptors has been reached.\n" 2992 "Hint: Try again after reducing the number of events.\n" 2993 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 2994 case ENOMEM: 2995 if (evsel__has_callchain(evsel) && 2996 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 2997 return scnprintf(msg, size, 2998 "Not enough memory to setup event with callchain.\n" 2999 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 3000 "Hint: Current value: %d", sysctl__max_stack()); 3001 break; 3002 case ENODEV: 3003 if (target->cpu_list) 3004 return scnprintf(msg, size, "%s", 3005 "No such device - did you specify an out-of-range profile CPU?"); 3006 break; 3007 case EOPNOTSUPP: 3008 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) 3009 return scnprintf(msg, size, 3010 "%s: PMU Hardware or event type doesn't support branch stack sampling.", 3011 evsel__name(evsel)); 3012 if (evsel->core.attr.aux_output) 3013 return scnprintf(msg, size, 3014 "%s: PMU Hardware doesn't support 'aux_output' feature", 3015 evsel__name(evsel)); 3016 if (evsel->core.attr.sample_period != 0) 3017 return scnprintf(msg, size, 3018 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 3019 evsel__name(evsel)); 3020 if (evsel->core.attr.precise_ip) 3021 return scnprintf(msg, size, "%s", 3022 "\'precise\' request may not be supported. Try removing 'p' modifier."); 3023 #if defined(__i386__) || defined(__x86_64__) 3024 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 3025 return scnprintf(msg, size, "%s", 3026 "No hardware sampling interrupt available.\n"); 3027 #endif 3028 break; 3029 case EBUSY: 3030 if (find_process("oprofiled")) 3031 return scnprintf(msg, size, 3032 "The PMU counters are busy/taken by another profiler.\n" 3033 "We found oprofile daemon running, please stop it and try again."); 3034 break; 3035 case EINVAL: 3036 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) 3037 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); 3038 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) 3039 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); 3040 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 3041 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 3042 if (perf_missing_features.clockid) 3043 return scnprintf(msg, size, "clockid feature not supported."); 3044 if (perf_missing_features.clockid_wrong) 3045 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 3046 if (perf_missing_features.aux_output) 3047 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 3048 if (!target__has_cpu(target)) 3049 return scnprintf(msg, size, 3050 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", 3051 evsel__name(evsel)); 3052 if (is_amd(arch, cpuid)) { 3053 if (is_amd_ibs(evsel)) { 3054 if (evsel->core.attr.exclude_kernel) 3055 return scnprintf(msg, size, 3056 "AMD IBS can't exclude kernel events. Try running at a higher privilege level."); 3057 if (!evsel->core.system_wide) 3058 return scnprintf(msg, size, 3059 "AMD IBS may only be available in system-wide/per-cpu mode. Try using -a, or -C and workload affinity"); 3060 } 3061 } 3062 3063 break; 3064 case ENODATA: 3065 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " 3066 "Please add an auxiliary event in front of the load latency event."); 3067 default: 3068 break; 3069 } 3070 3071 return scnprintf(msg, size, 3072 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 3073 "/bin/dmesg | grep -i perf may provide additional information.\n", 3074 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel)); 3075 } 3076 3077 struct perf_env *evsel__env(struct evsel *evsel) 3078 { 3079 if (evsel && evsel->evlist && evsel->evlist->env) 3080 return evsel->evlist->env; 3081 return &perf_env; 3082 } 3083 3084 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 3085 { 3086 int cpu_map_idx, thread; 3087 3088 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { 3089 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 3090 thread++) { 3091 int fd = FD(evsel, cpu_map_idx, thread); 3092 3093 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 3094 cpu_map_idx, thread, fd) < 0) 3095 return -1; 3096 } 3097 } 3098 3099 return 0; 3100 } 3101 3102 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 3103 { 3104 struct perf_cpu_map *cpus = evsel->core.cpus; 3105 struct perf_thread_map *threads = evsel->core.threads; 3106 3107 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr)) 3108 return -ENOMEM; 3109 3110 return store_evsel_ids(evsel, evlist); 3111 } 3112 3113 void evsel__zero_per_pkg(struct evsel *evsel) 3114 { 3115 struct hashmap_entry *cur; 3116 size_t bkt; 3117 3118 if (evsel->per_pkg_mask) { 3119 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) 3120 free((char *)cur->key); 3121 3122 hashmap__clear(evsel->per_pkg_mask); 3123 } 3124 } 3125 3126 bool evsel__is_hybrid(struct evsel *evsel) 3127 { 3128 return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name); 3129 } 3130 3131 struct evsel *evsel__leader(struct evsel *evsel) 3132 { 3133 return container_of(evsel->core.leader, struct evsel, core); 3134 } 3135 3136 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) 3137 { 3138 return evsel->core.leader == &leader->core; 3139 } 3140 3141 bool evsel__is_leader(struct evsel *evsel) 3142 { 3143 return evsel__has_leader(evsel, evsel); 3144 } 3145 3146 void evsel__set_leader(struct evsel *evsel, struct evsel *leader) 3147 { 3148 evsel->core.leader = &leader->core; 3149 } 3150 3151 int evsel__source_count(const struct evsel *evsel) 3152 { 3153 struct evsel *pos; 3154 int count = 0; 3155 3156 evlist__for_each_entry(evsel->evlist, pos) { 3157 if (pos->metric_leader == evsel) 3158 count++; 3159 } 3160 return count; 3161 } 3162 3163 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) 3164 { 3165 return false; 3166 } 3167 3168 /* 3169 * Remove an event from a given group (leader). 3170 * Some events, e.g., perf metrics Topdown events, 3171 * must always be grouped. Ignore the events. 3172 */ 3173 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) 3174 { 3175 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { 3176 evsel__set_leader(evsel, evsel); 3177 evsel->core.nr_members = 0; 3178 leader->core.nr_members--; 3179 } 3180 } 3181