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