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 <linux/hw_breakpoint.h> 16 #include <linux/perf_event.h> 17 #include <linux/compiler.h> 18 #include <linux/err.h> 19 #include <linux/zalloc.h> 20 #include <sys/ioctl.h> 21 #include <sys/resource.h> 22 #include <sys/types.h> 23 #include <dirent.h> 24 #include <stdlib.h> 25 #include <perf/evsel.h> 26 #include "asm/bug.h" 27 #include "bpf_counter.h" 28 #include "callchain.h" 29 #include "cgroup.h" 30 #include "counts.h" 31 #include "event.h" 32 #include "evsel.h" 33 #include "util/env.h" 34 #include "util/evsel_config.h" 35 #include "util/evsel_fprintf.h" 36 #include "evlist.h" 37 #include <perf/cpumap.h> 38 #include "thread_map.h" 39 #include "target.h" 40 #include "perf_regs.h" 41 #include "record.h" 42 #include "debug.h" 43 #include "trace-event.h" 44 #include "stat.h" 45 #include "string2.h" 46 #include "memswap.h" 47 #include "util.h" 48 #include "util/hashmap.h" 49 #include "pmu-hybrid.h" 50 #include "off_cpu.h" 51 #include "../perf-sys.h" 52 #include "util/parse-branch-options.h" 53 #include <internal/xyarray.h> 54 #include <internal/lib.h> 55 #include <internal/threadmap.h> 56 57 #include <linux/ctype.h> 58 59 #ifdef HAVE_LIBTRACEEVENT 60 #include <traceevent/event-parse.h> 61 #endif 62 63 struct perf_missing_features perf_missing_features; 64 65 static clockid_t clockid; 66 67 static const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = { 68 NULL, 69 "duration_time", 70 "user_time", 71 "system_time", 72 }; 73 74 const char *perf_tool_event__to_str(enum perf_tool_event ev) 75 { 76 if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX) 77 return perf_tool_event__tool_names[ev]; 78 79 return NULL; 80 } 81 82 enum perf_tool_event perf_tool_event__from_str(const char *str) 83 { 84 int i; 85 86 perf_tool_event__for_each_event(i) { 87 if (!strcmp(str, perf_tool_event__tool_names[i])) 88 return i; 89 } 90 return PERF_TOOL_NONE; 91 } 92 93 94 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused) 95 { 96 return 0; 97 } 98 99 void __weak test_attr__ready(void) { } 100 101 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused) 102 { 103 } 104 105 static struct { 106 size_t size; 107 int (*init)(struct evsel *evsel); 108 void (*fini)(struct evsel *evsel); 109 } perf_evsel__object = { 110 .size = sizeof(struct evsel), 111 .init = evsel__no_extra_init, 112 .fini = evsel__no_extra_fini, 113 }; 114 115 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel), 116 void (*fini)(struct evsel *evsel)) 117 { 118 119 if (object_size == 0) 120 goto set_methods; 121 122 if (perf_evsel__object.size > object_size) 123 return -EINVAL; 124 125 perf_evsel__object.size = object_size; 126 127 set_methods: 128 if (init != NULL) 129 perf_evsel__object.init = init; 130 131 if (fini != NULL) 132 perf_evsel__object.fini = fini; 133 134 return 0; 135 } 136 137 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 138 139 int __evsel__sample_size(u64 sample_type) 140 { 141 u64 mask = sample_type & PERF_SAMPLE_MASK; 142 int size = 0; 143 int i; 144 145 for (i = 0; i < 64; i++) { 146 if (mask & (1ULL << i)) 147 size++; 148 } 149 150 size *= sizeof(u64); 151 152 return size; 153 } 154 155 /** 156 * __perf_evsel__calc_id_pos - calculate id_pos. 157 * @sample_type: sample type 158 * 159 * This function returns the position of the event id (PERF_SAMPLE_ID or 160 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 161 * perf_record_sample. 162 */ 163 static int __perf_evsel__calc_id_pos(u64 sample_type) 164 { 165 int idx = 0; 166 167 if (sample_type & PERF_SAMPLE_IDENTIFIER) 168 return 0; 169 170 if (!(sample_type & PERF_SAMPLE_ID)) 171 return -1; 172 173 if (sample_type & PERF_SAMPLE_IP) 174 idx += 1; 175 176 if (sample_type & PERF_SAMPLE_TID) 177 idx += 1; 178 179 if (sample_type & PERF_SAMPLE_TIME) 180 idx += 1; 181 182 if (sample_type & PERF_SAMPLE_ADDR) 183 idx += 1; 184 185 return idx; 186 } 187 188 /** 189 * __perf_evsel__calc_is_pos - calculate is_pos. 190 * @sample_type: sample type 191 * 192 * This function returns the position (counting backwards) of the event id 193 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 194 * sample_id_all is used there is an id sample appended to non-sample events. 195 */ 196 static int __perf_evsel__calc_is_pos(u64 sample_type) 197 { 198 int idx = 1; 199 200 if (sample_type & PERF_SAMPLE_IDENTIFIER) 201 return 1; 202 203 if (!(sample_type & PERF_SAMPLE_ID)) 204 return -1; 205 206 if (sample_type & PERF_SAMPLE_CPU) 207 idx += 1; 208 209 if (sample_type & PERF_SAMPLE_STREAM_ID) 210 idx += 1; 211 212 return idx; 213 } 214 215 void evsel__calc_id_pos(struct evsel *evsel) 216 { 217 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type); 218 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type); 219 } 220 221 void __evsel__set_sample_bit(struct evsel *evsel, 222 enum perf_event_sample_format bit) 223 { 224 if (!(evsel->core.attr.sample_type & bit)) { 225 evsel->core.attr.sample_type |= bit; 226 evsel->sample_size += sizeof(u64); 227 evsel__calc_id_pos(evsel); 228 } 229 } 230 231 void __evsel__reset_sample_bit(struct evsel *evsel, 232 enum perf_event_sample_format bit) 233 { 234 if (evsel->core.attr.sample_type & bit) { 235 evsel->core.attr.sample_type &= ~bit; 236 evsel->sample_size -= sizeof(u64); 237 evsel__calc_id_pos(evsel); 238 } 239 } 240 241 void evsel__set_sample_id(struct evsel *evsel, 242 bool can_sample_identifier) 243 { 244 if (can_sample_identifier) { 245 evsel__reset_sample_bit(evsel, ID); 246 evsel__set_sample_bit(evsel, IDENTIFIER); 247 } else { 248 evsel__set_sample_bit(evsel, ID); 249 } 250 evsel->core.attr.read_format |= PERF_FORMAT_ID; 251 } 252 253 /** 254 * evsel__is_function_event - Return whether given evsel is a function 255 * trace event 256 * 257 * @evsel - evsel selector to be tested 258 * 259 * Return %true if event is function trace event 260 */ 261 bool evsel__is_function_event(struct evsel *evsel) 262 { 263 #define FUNCTION_EVENT "ftrace:function" 264 265 return evsel->name && 266 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT)); 267 268 #undef FUNCTION_EVENT 269 } 270 271 void evsel__init(struct evsel *evsel, 272 struct perf_event_attr *attr, int idx) 273 { 274 perf_evsel__init(&evsel->core, attr, idx); 275 evsel->tracking = !idx; 276 evsel->unit = strdup(""); 277 evsel->scale = 1.0; 278 evsel->max_events = ULONG_MAX; 279 evsel->evlist = NULL; 280 evsel->bpf_obj = NULL; 281 evsel->bpf_fd = -1; 282 INIT_LIST_HEAD(&evsel->config_terms); 283 INIT_LIST_HEAD(&evsel->bpf_counter_list); 284 perf_evsel__object.init(evsel); 285 evsel->sample_size = __evsel__sample_size(attr->sample_type); 286 evsel__calc_id_pos(evsel); 287 evsel->cmdline_group_boundary = false; 288 evsel->metric_events = NULL; 289 evsel->per_pkg_mask = NULL; 290 evsel->collect_stat = false; 291 evsel->pmu_name = NULL; 292 } 293 294 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 295 { 296 struct evsel *evsel = zalloc(perf_evsel__object.size); 297 298 if (!evsel) 299 return NULL; 300 evsel__init(evsel, attr, idx); 301 302 if (evsel__is_bpf_output(evsel) && !attr->sample_type) { 303 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 304 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 305 evsel->core.attr.sample_period = 1; 306 } 307 308 if (evsel__is_clock(evsel)) { 309 free((char *)evsel->unit); 310 evsel->unit = strdup("msec"); 311 evsel->scale = 1e-6; 312 } 313 314 return evsel; 315 } 316 317 static bool perf_event_can_profile_kernel(void) 318 { 319 return perf_event_paranoid_check(1); 320 } 321 322 struct evsel *evsel__new_cycles(bool precise __maybe_unused, __u32 type, __u64 config) 323 { 324 struct perf_event_attr attr = { 325 .type = type, 326 .config = config, 327 .exclude_kernel = !perf_event_can_profile_kernel(), 328 }; 329 struct evsel *evsel; 330 331 event_attr_init(&attr); 332 333 /* 334 * Now let the usual logic to set up the perf_event_attr defaults 335 * to kick in when we return and before perf_evsel__open() is called. 336 */ 337 evsel = evsel__new(&attr); 338 if (evsel == NULL) 339 goto out; 340 341 arch_evsel__fixup_new_cycles(&evsel->core.attr); 342 343 evsel->precise_max = true; 344 345 /* use asprintf() because free(evsel) assumes name is allocated */ 346 if (asprintf(&evsel->name, "cycles%s%s%.*s", 347 (attr.precise_ip || attr.exclude_kernel) ? ":" : "", 348 attr.exclude_kernel ? "u" : "", 349 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0) 350 goto error_free; 351 out: 352 return evsel; 353 error_free: 354 evsel__delete(evsel); 355 evsel = NULL; 356 goto out; 357 } 358 359 int copy_config_terms(struct list_head *dst, struct list_head *src) 360 { 361 struct evsel_config_term *pos, *tmp; 362 363 list_for_each_entry(pos, src, list) { 364 tmp = malloc(sizeof(*tmp)); 365 if (tmp == NULL) 366 return -ENOMEM; 367 368 *tmp = *pos; 369 if (tmp->free_str) { 370 tmp->val.str = strdup(pos->val.str); 371 if (tmp->val.str == NULL) { 372 free(tmp); 373 return -ENOMEM; 374 } 375 } 376 list_add_tail(&tmp->list, dst); 377 } 378 return 0; 379 } 380 381 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) 382 { 383 return copy_config_terms(&dst->config_terms, &src->config_terms); 384 } 385 386 /** 387 * evsel__clone - create a new evsel copied from @orig 388 * @orig: original evsel 389 * 390 * The assumption is that @orig is not configured nor opened yet. 391 * So we only care about the attributes that can be set while it's parsed. 392 */ 393 struct evsel *evsel__clone(struct evsel *orig) 394 { 395 struct evsel *evsel; 396 397 BUG_ON(orig->core.fd); 398 BUG_ON(orig->counts); 399 BUG_ON(orig->priv); 400 BUG_ON(orig->per_pkg_mask); 401 402 /* cannot handle BPF objects for now */ 403 if (orig->bpf_obj) 404 return NULL; 405 406 evsel = evsel__new(&orig->core.attr); 407 if (evsel == NULL) 408 return NULL; 409 410 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus); 411 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus); 412 evsel->core.threads = perf_thread_map__get(orig->core.threads); 413 evsel->core.nr_members = orig->core.nr_members; 414 evsel->core.system_wide = orig->core.system_wide; 415 evsel->core.requires_cpu = orig->core.requires_cpu; 416 417 if (orig->name) { 418 evsel->name = strdup(orig->name); 419 if (evsel->name == NULL) 420 goto out_err; 421 } 422 if (orig->group_name) { 423 evsel->group_name = strdup(orig->group_name); 424 if (evsel->group_name == NULL) 425 goto out_err; 426 } 427 if (orig->pmu_name) { 428 evsel->pmu_name = strdup(orig->pmu_name); 429 if (evsel->pmu_name == NULL) 430 goto out_err; 431 } 432 if (orig->filter) { 433 evsel->filter = strdup(orig->filter); 434 if (evsel->filter == NULL) 435 goto out_err; 436 } 437 if (orig->metric_id) { 438 evsel->metric_id = strdup(orig->metric_id); 439 if (evsel->metric_id == NULL) 440 goto out_err; 441 } 442 evsel->cgrp = cgroup__get(orig->cgrp); 443 #ifdef HAVE_LIBTRACEEVENT 444 evsel->tp_format = orig->tp_format; 445 #endif 446 evsel->handler = orig->handler; 447 evsel->core.leader = orig->core.leader; 448 449 evsel->max_events = orig->max_events; 450 evsel->tool_event = orig->tool_event; 451 free((char *)evsel->unit); 452 evsel->unit = strdup(orig->unit); 453 if (evsel->unit == NULL) 454 goto out_err; 455 456 evsel->scale = orig->scale; 457 evsel->snapshot = orig->snapshot; 458 evsel->per_pkg = orig->per_pkg; 459 evsel->percore = orig->percore; 460 evsel->precise_max = orig->precise_max; 461 evsel->use_uncore_alias = orig->use_uncore_alias; 462 evsel->is_libpfm_event = orig->is_libpfm_event; 463 464 evsel->exclude_GH = orig->exclude_GH; 465 evsel->sample_read = orig->sample_read; 466 evsel->auto_merge_stats = orig->auto_merge_stats; 467 evsel->collect_stat = orig->collect_stat; 468 evsel->weak_group = orig->weak_group; 469 evsel->use_config_name = orig->use_config_name; 470 evsel->pmu = orig->pmu; 471 472 if (evsel__copy_config_terms(evsel, orig) < 0) 473 goto out_err; 474 475 return evsel; 476 477 out_err: 478 evsel__delete(evsel); 479 return NULL; 480 } 481 482 /* 483 * Returns pointer with encoded error via <linux/err.h> interface. 484 */ 485 #ifdef HAVE_LIBTRACEEVENT 486 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx) 487 { 488 struct evsel *evsel = zalloc(perf_evsel__object.size); 489 int err = -ENOMEM; 490 491 if (evsel == NULL) { 492 goto out_err; 493 } else { 494 struct perf_event_attr attr = { 495 .type = PERF_TYPE_TRACEPOINT, 496 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 497 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 498 }; 499 500 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 501 goto out_free; 502 503 evsel->tp_format = trace_event__tp_format(sys, name); 504 if (IS_ERR(evsel->tp_format)) { 505 err = PTR_ERR(evsel->tp_format); 506 goto out_free; 507 } 508 509 event_attr_init(&attr); 510 attr.config = evsel->tp_format->id; 511 attr.sample_period = 1; 512 evsel__init(evsel, &attr, idx); 513 } 514 515 return evsel; 516 517 out_free: 518 zfree(&evsel->name); 519 free(evsel); 520 out_err: 521 return ERR_PTR(err); 522 } 523 #endif 524 525 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = { 526 "cycles", 527 "instructions", 528 "cache-references", 529 "cache-misses", 530 "branches", 531 "branch-misses", 532 "bus-cycles", 533 "stalled-cycles-frontend", 534 "stalled-cycles-backend", 535 "ref-cycles", 536 }; 537 538 char *evsel__bpf_counter_events; 539 540 bool evsel__match_bpf_counter_events(const char *name) 541 { 542 int name_len; 543 bool match; 544 char *ptr; 545 546 if (!evsel__bpf_counter_events) 547 return false; 548 549 ptr = strstr(evsel__bpf_counter_events, name); 550 name_len = strlen(name); 551 552 /* check name matches a full token in evsel__bpf_counter_events */ 553 match = (ptr != NULL) && 554 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && 555 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); 556 557 return match; 558 } 559 560 static const char *__evsel__hw_name(u64 config) 561 { 562 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 563 return evsel__hw_names[config]; 564 565 return "unknown-hardware"; 566 } 567 568 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 569 { 570 int colon = 0, r = 0; 571 struct perf_event_attr *attr = &evsel->core.attr; 572 bool exclude_guest_default = false; 573 574 #define MOD_PRINT(context, mod) do { \ 575 if (!attr->exclude_##context) { \ 576 if (!colon) colon = ++r; \ 577 r += scnprintf(bf + r, size - r, "%c", mod); \ 578 } } while(0) 579 580 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 581 MOD_PRINT(kernel, 'k'); 582 MOD_PRINT(user, 'u'); 583 MOD_PRINT(hv, 'h'); 584 exclude_guest_default = true; 585 } 586 587 if (attr->precise_ip) { 588 if (!colon) 589 colon = ++r; 590 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 591 exclude_guest_default = true; 592 } 593 594 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 595 MOD_PRINT(host, 'H'); 596 MOD_PRINT(guest, 'G'); 597 } 598 #undef MOD_PRINT 599 if (colon) 600 bf[colon - 1] = ':'; 601 return r; 602 } 603 604 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 605 { 606 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 607 } 608 609 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 610 { 611 int r = arch_evsel__hw_name(evsel, bf, size); 612 return r + evsel__add_modifiers(evsel, bf + r, size - r); 613 } 614 615 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = { 616 "cpu-clock", 617 "task-clock", 618 "page-faults", 619 "context-switches", 620 "cpu-migrations", 621 "minor-faults", 622 "major-faults", 623 "alignment-faults", 624 "emulation-faults", 625 "dummy", 626 }; 627 628 static const char *__evsel__sw_name(u64 config) 629 { 630 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 631 return evsel__sw_names[config]; 632 return "unknown-software"; 633 } 634 635 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 636 { 637 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 638 return r + evsel__add_modifiers(evsel, bf + r, size - r); 639 } 640 641 static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size) 642 { 643 return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev)); 644 } 645 646 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 647 { 648 int r; 649 650 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 651 652 if (type & HW_BREAKPOINT_R) 653 r += scnprintf(bf + r, size - r, "r"); 654 655 if (type & HW_BREAKPOINT_W) 656 r += scnprintf(bf + r, size - r, "w"); 657 658 if (type & HW_BREAKPOINT_X) 659 r += scnprintf(bf + r, size - r, "x"); 660 661 return r; 662 } 663 664 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 665 { 666 struct perf_event_attr *attr = &evsel->core.attr; 667 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 668 return r + evsel__add_modifiers(evsel, bf + r, size - r); 669 } 670 671 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 672 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 673 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 674 { "LLC", "L2", }, 675 { "dTLB", "d-tlb", "Data-TLB", }, 676 { "iTLB", "i-tlb", "Instruction-TLB", }, 677 { "branch", "branches", "bpu", "btb", "bpc", }, 678 { "node", }, 679 }; 680 681 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 682 { "load", "loads", "read", }, 683 { "store", "stores", "write", }, 684 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 685 }; 686 687 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 688 { "refs", "Reference", "ops", "access", }, 689 { "misses", "miss", }, 690 }; 691 692 #define C(x) PERF_COUNT_HW_CACHE_##x 693 #define CACHE_READ (1 << C(OP_READ)) 694 #define CACHE_WRITE (1 << C(OP_WRITE)) 695 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 696 #define COP(x) (1 << x) 697 698 /* 699 * cache operation stat 700 * L1I : Read and prefetch only 701 * ITLB and BPU : Read-only 702 */ 703 static const unsigned long evsel__hw_cache_stat[C(MAX)] = { 704 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 705 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 706 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 707 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 708 [C(ITLB)] = (CACHE_READ), 709 [C(BPU)] = (CACHE_READ), 710 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 711 }; 712 713 bool evsel__is_cache_op_valid(u8 type, u8 op) 714 { 715 if (evsel__hw_cache_stat[type] & COP(op)) 716 return true; /* valid */ 717 else 718 return false; /* invalid */ 719 } 720 721 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 722 { 723 if (result) { 724 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 725 evsel__hw_cache_op[op][0], 726 evsel__hw_cache_result[result][0]); 727 } 728 729 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 730 evsel__hw_cache_op[op][1]); 731 } 732 733 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 734 { 735 u8 op, result, type = (config >> 0) & 0xff; 736 const char *err = "unknown-ext-hardware-cache-type"; 737 738 if (type >= PERF_COUNT_HW_CACHE_MAX) 739 goto out_err; 740 741 op = (config >> 8) & 0xff; 742 err = "unknown-ext-hardware-cache-op"; 743 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 744 goto out_err; 745 746 result = (config >> 16) & 0xff; 747 err = "unknown-ext-hardware-cache-result"; 748 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 749 goto out_err; 750 751 err = "invalid-cache"; 752 if (!evsel__is_cache_op_valid(type, op)) 753 goto out_err; 754 755 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 756 out_err: 757 return scnprintf(bf, size, "%s", err); 758 } 759 760 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 761 { 762 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 763 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 764 } 765 766 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 767 { 768 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 769 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 770 } 771 772 const char *evsel__name(struct evsel *evsel) 773 { 774 char bf[128]; 775 776 if (!evsel) 777 goto out_unknown; 778 779 if (evsel->name) 780 return evsel->name; 781 782 switch (evsel->core.attr.type) { 783 case PERF_TYPE_RAW: 784 evsel__raw_name(evsel, bf, sizeof(bf)); 785 break; 786 787 case PERF_TYPE_HARDWARE: 788 evsel__hw_name(evsel, bf, sizeof(bf)); 789 break; 790 791 case PERF_TYPE_HW_CACHE: 792 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 793 break; 794 795 case PERF_TYPE_SOFTWARE: 796 if (evsel__is_tool(evsel)) 797 evsel__tool_name(evsel->tool_event, bf, sizeof(bf)); 798 else 799 evsel__sw_name(evsel, bf, sizeof(bf)); 800 break; 801 802 case PERF_TYPE_TRACEPOINT: 803 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 804 break; 805 806 case PERF_TYPE_BREAKPOINT: 807 evsel__bp_name(evsel, bf, sizeof(bf)); 808 break; 809 810 default: 811 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 812 evsel->core.attr.type); 813 break; 814 } 815 816 evsel->name = strdup(bf); 817 818 if (evsel->name) 819 return evsel->name; 820 out_unknown: 821 return "unknown"; 822 } 823 824 const char *evsel__metric_id(const struct evsel *evsel) 825 { 826 if (evsel->metric_id) 827 return evsel->metric_id; 828 829 if (evsel__is_tool(evsel)) 830 return perf_tool_event__to_str(evsel->tool_event); 831 832 return "unknown"; 833 } 834 835 const char *evsel__group_name(struct evsel *evsel) 836 { 837 return evsel->group_name ?: "anon group"; 838 } 839 840 /* 841 * Returns the group details for the specified leader, 842 * with following rules. 843 * 844 * For record -e '{cycles,instructions}' 845 * 'anon group { cycles:u, instructions:u }' 846 * 847 * For record -e 'cycles,instructions' and report --group 848 * 'cycles:u, instructions:u' 849 */ 850 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 851 { 852 int ret = 0; 853 struct evsel *pos; 854 const char *group_name = evsel__group_name(evsel); 855 856 if (!evsel->forced_leader) 857 ret = scnprintf(buf, size, "%s { ", group_name); 858 859 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel)); 860 861 for_each_group_member(pos, evsel) 862 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos)); 863 864 if (!evsel->forced_leader) 865 ret += scnprintf(buf + ret, size - ret, " }"); 866 867 return ret; 868 } 869 870 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 871 struct callchain_param *param) 872 { 873 bool function = evsel__is_function_event(evsel); 874 struct perf_event_attr *attr = &evsel->core.attr; 875 876 evsel__set_sample_bit(evsel, CALLCHAIN); 877 878 attr->sample_max_stack = param->max_stack; 879 880 if (opts->kernel_callchains) 881 attr->exclude_callchain_user = 1; 882 if (opts->user_callchains) 883 attr->exclude_callchain_kernel = 1; 884 if (param->record_mode == CALLCHAIN_LBR) { 885 if (!opts->branch_stack) { 886 if (attr->exclude_user) { 887 pr_warning("LBR callstack option is only available " 888 "to get user callchain information. " 889 "Falling back to framepointers.\n"); 890 } else { 891 evsel__set_sample_bit(evsel, BRANCH_STACK); 892 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 893 PERF_SAMPLE_BRANCH_CALL_STACK | 894 PERF_SAMPLE_BRANCH_NO_CYCLES | 895 PERF_SAMPLE_BRANCH_NO_FLAGS | 896 PERF_SAMPLE_BRANCH_HW_INDEX; 897 } 898 } else 899 pr_warning("Cannot use LBR callstack with branch stack. " 900 "Falling back to framepointers.\n"); 901 } 902 903 if (param->record_mode == CALLCHAIN_DWARF) { 904 if (!function) { 905 evsel__set_sample_bit(evsel, REGS_USER); 906 evsel__set_sample_bit(evsel, STACK_USER); 907 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) { 908 attr->sample_regs_user |= DWARF_MINIMAL_REGS; 909 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 910 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 911 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 912 } else { 913 attr->sample_regs_user |= arch__user_reg_mask(); 914 } 915 attr->sample_stack_user = param->dump_size; 916 attr->exclude_callchain_user = 1; 917 } else { 918 pr_info("Cannot use DWARF unwind for function trace event," 919 " falling back to framepointers.\n"); 920 } 921 } 922 923 if (function) { 924 pr_info("Disabling user space callchains for function trace event.\n"); 925 attr->exclude_callchain_user = 1; 926 } 927 } 928 929 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 930 struct callchain_param *param) 931 { 932 if (param->enabled) 933 return __evsel__config_callchain(evsel, opts, param); 934 } 935 936 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param) 937 { 938 struct perf_event_attr *attr = &evsel->core.attr; 939 940 evsel__reset_sample_bit(evsel, CALLCHAIN); 941 if (param->record_mode == CALLCHAIN_LBR) { 942 evsel__reset_sample_bit(evsel, BRANCH_STACK); 943 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 944 PERF_SAMPLE_BRANCH_CALL_STACK | 945 PERF_SAMPLE_BRANCH_HW_INDEX); 946 } 947 if (param->record_mode == CALLCHAIN_DWARF) { 948 evsel__reset_sample_bit(evsel, REGS_USER); 949 evsel__reset_sample_bit(evsel, STACK_USER); 950 } 951 } 952 953 static void evsel__apply_config_terms(struct evsel *evsel, 954 struct record_opts *opts, bool track) 955 { 956 struct evsel_config_term *term; 957 struct list_head *config_terms = &evsel->config_terms; 958 struct perf_event_attr *attr = &evsel->core.attr; 959 /* callgraph default */ 960 struct callchain_param param = { 961 .record_mode = callchain_param.record_mode, 962 }; 963 u32 dump_size = 0; 964 int max_stack = 0; 965 const char *callgraph_buf = NULL; 966 967 list_for_each_entry(term, config_terms, list) { 968 switch (term->type) { 969 case EVSEL__CONFIG_TERM_PERIOD: 970 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 971 attr->sample_period = term->val.period; 972 attr->freq = 0; 973 evsel__reset_sample_bit(evsel, PERIOD); 974 } 975 break; 976 case EVSEL__CONFIG_TERM_FREQ: 977 if (!(term->weak && opts->user_freq != UINT_MAX)) { 978 attr->sample_freq = term->val.freq; 979 attr->freq = 1; 980 evsel__set_sample_bit(evsel, PERIOD); 981 } 982 break; 983 case EVSEL__CONFIG_TERM_TIME: 984 if (term->val.time) 985 evsel__set_sample_bit(evsel, TIME); 986 else 987 evsel__reset_sample_bit(evsel, TIME); 988 break; 989 case EVSEL__CONFIG_TERM_CALLGRAPH: 990 callgraph_buf = term->val.str; 991 break; 992 case EVSEL__CONFIG_TERM_BRANCH: 993 if (term->val.str && strcmp(term->val.str, "no")) { 994 evsel__set_sample_bit(evsel, BRANCH_STACK); 995 parse_branch_str(term->val.str, 996 &attr->branch_sample_type); 997 } else 998 evsel__reset_sample_bit(evsel, BRANCH_STACK); 999 break; 1000 case EVSEL__CONFIG_TERM_STACK_USER: 1001 dump_size = term->val.stack_user; 1002 break; 1003 case EVSEL__CONFIG_TERM_MAX_STACK: 1004 max_stack = term->val.max_stack; 1005 break; 1006 case EVSEL__CONFIG_TERM_MAX_EVENTS: 1007 evsel->max_events = term->val.max_events; 1008 break; 1009 case EVSEL__CONFIG_TERM_INHERIT: 1010 /* 1011 * attr->inherit should has already been set by 1012 * evsel__config. If user explicitly set 1013 * inherit using config terms, override global 1014 * opt->no_inherit setting. 1015 */ 1016 attr->inherit = term->val.inherit ? 1 : 0; 1017 break; 1018 case EVSEL__CONFIG_TERM_OVERWRITE: 1019 attr->write_backward = term->val.overwrite ? 1 : 0; 1020 break; 1021 case EVSEL__CONFIG_TERM_DRV_CFG: 1022 break; 1023 case EVSEL__CONFIG_TERM_PERCORE: 1024 break; 1025 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 1026 attr->aux_output = term->val.aux_output ? 1 : 0; 1027 break; 1028 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 1029 /* Already applied by auxtrace */ 1030 break; 1031 case EVSEL__CONFIG_TERM_CFG_CHG: 1032 break; 1033 default: 1034 break; 1035 } 1036 } 1037 1038 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 1039 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 1040 bool sample_address = false; 1041 1042 if (max_stack) { 1043 param.max_stack = max_stack; 1044 if (callgraph_buf == NULL) 1045 callgraph_buf = "fp"; 1046 } 1047 1048 /* parse callgraph parameters */ 1049 if (callgraph_buf != NULL) { 1050 if (!strcmp(callgraph_buf, "no")) { 1051 param.enabled = false; 1052 param.record_mode = CALLCHAIN_NONE; 1053 } else { 1054 param.enabled = true; 1055 if (parse_callchain_record(callgraph_buf, ¶m)) { 1056 pr_err("per-event callgraph setting for %s failed. " 1057 "Apply callgraph global setting for it\n", 1058 evsel->name); 1059 return; 1060 } 1061 if (param.record_mode == CALLCHAIN_DWARF) 1062 sample_address = true; 1063 } 1064 } 1065 if (dump_size > 0) { 1066 dump_size = round_up(dump_size, sizeof(u64)); 1067 param.dump_size = dump_size; 1068 } 1069 1070 /* If global callgraph set, clear it */ 1071 if (callchain_param.enabled) 1072 evsel__reset_callgraph(evsel, &callchain_param); 1073 1074 /* set perf-event callgraph */ 1075 if (param.enabled) { 1076 if (sample_address) { 1077 evsel__set_sample_bit(evsel, ADDR); 1078 evsel__set_sample_bit(evsel, DATA_SRC); 1079 evsel->core.attr.mmap_data = track; 1080 } 1081 evsel__config_callchain(evsel, opts, ¶m); 1082 } 1083 } 1084 } 1085 1086 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 1087 { 1088 struct evsel_config_term *term, *found_term = NULL; 1089 1090 list_for_each_entry(term, &evsel->config_terms, list) { 1091 if (term->type == type) 1092 found_term = term; 1093 } 1094 1095 return found_term; 1096 } 1097 1098 void __weak arch_evsel__set_sample_weight(struct evsel *evsel) 1099 { 1100 evsel__set_sample_bit(evsel, WEIGHT); 1101 } 1102 1103 void __weak arch_evsel__fixup_new_cycles(struct perf_event_attr *attr __maybe_unused) 1104 { 1105 } 1106 1107 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, 1108 struct perf_event_attr *attr __maybe_unused) 1109 { 1110 } 1111 1112 static void evsel__set_default_freq_period(struct record_opts *opts, 1113 struct perf_event_attr *attr) 1114 { 1115 if (opts->freq) { 1116 attr->freq = 1; 1117 attr->sample_freq = opts->freq; 1118 } else { 1119 attr->sample_period = opts->default_interval; 1120 } 1121 } 1122 1123 static bool evsel__is_offcpu_event(struct evsel *evsel) 1124 { 1125 return evsel__is_bpf_output(evsel) && !strcmp(evsel->name, OFFCPU_EVENT); 1126 } 1127 1128 /* 1129 * The enable_on_exec/disabled value strategy: 1130 * 1131 * 1) For any type of traced program: 1132 * - all independent events and group leaders are disabled 1133 * - all group members are enabled 1134 * 1135 * Group members are ruled by group leaders. They need to 1136 * be enabled, because the group scheduling relies on that. 1137 * 1138 * 2) For traced programs executed by perf: 1139 * - all independent events and group leaders have 1140 * enable_on_exec set 1141 * - we don't specifically enable or disable any event during 1142 * the record command 1143 * 1144 * Independent events and group leaders are initially disabled 1145 * and get enabled by exec. Group members are ruled by group 1146 * leaders as stated in 1). 1147 * 1148 * 3) For traced programs attached by perf (pid/tid): 1149 * - we specifically enable or disable all events during 1150 * the record command 1151 * 1152 * When attaching events to already running traced we 1153 * enable/disable events specifically, as there's no 1154 * initial traced exec call. 1155 */ 1156 void evsel__config(struct evsel *evsel, struct record_opts *opts, 1157 struct callchain_param *callchain) 1158 { 1159 struct evsel *leader = evsel__leader(evsel); 1160 struct perf_event_attr *attr = &evsel->core.attr; 1161 int track = evsel->tracking; 1162 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 1163 1164 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 1165 attr->inherit = !opts->no_inherit; 1166 attr->write_backward = opts->overwrite ? 1 : 0; 1167 attr->read_format = PERF_FORMAT_LOST; 1168 1169 evsel__set_sample_bit(evsel, IP); 1170 evsel__set_sample_bit(evsel, TID); 1171 1172 if (evsel->sample_read) { 1173 evsel__set_sample_bit(evsel, READ); 1174 1175 /* 1176 * We need ID even in case of single event, because 1177 * PERF_SAMPLE_READ process ID specific data. 1178 */ 1179 evsel__set_sample_id(evsel, false); 1180 1181 /* 1182 * Apply group format only if we belong to group 1183 * with more than one members. 1184 */ 1185 if (leader->core.nr_members > 1) { 1186 attr->read_format |= PERF_FORMAT_GROUP; 1187 attr->inherit = 0; 1188 } 1189 } 1190 1191 /* 1192 * We default some events to have a default interval. But keep 1193 * it a weak assumption overridable by the user. 1194 */ 1195 if ((evsel->is_libpfm_event && !attr->sample_period) || 1196 (!evsel->is_libpfm_event && (!attr->sample_period || 1197 opts->user_freq != UINT_MAX || 1198 opts->user_interval != ULLONG_MAX))) 1199 evsel__set_default_freq_period(opts, attr); 1200 1201 /* 1202 * If attr->freq was set (here or earlier), ask for period 1203 * to be sampled. 1204 */ 1205 if (attr->freq) 1206 evsel__set_sample_bit(evsel, PERIOD); 1207 1208 if (opts->no_samples) 1209 attr->sample_freq = 0; 1210 1211 if (opts->inherit_stat) { 1212 evsel->core.attr.read_format |= 1213 PERF_FORMAT_TOTAL_TIME_ENABLED | 1214 PERF_FORMAT_TOTAL_TIME_RUNNING | 1215 PERF_FORMAT_ID; 1216 attr->inherit_stat = 1; 1217 } 1218 1219 if (opts->sample_address) { 1220 evsel__set_sample_bit(evsel, ADDR); 1221 attr->mmap_data = track; 1222 } 1223 1224 /* 1225 * We don't allow user space callchains for function trace 1226 * event, due to issues with page faults while tracing page 1227 * fault handler and its overall trickiness nature. 1228 */ 1229 if (evsel__is_function_event(evsel)) 1230 evsel->core.attr.exclude_callchain_user = 1; 1231 1232 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1233 evsel__config_callchain(evsel, opts, callchain); 1234 1235 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1236 !evsel__is_dummy_event(evsel)) { 1237 attr->sample_regs_intr = opts->sample_intr_regs; 1238 evsel__set_sample_bit(evsel, REGS_INTR); 1239 } 1240 1241 if (opts->sample_user_regs && !evsel->no_aux_samples && 1242 !evsel__is_dummy_event(evsel)) { 1243 attr->sample_regs_user |= opts->sample_user_regs; 1244 evsel__set_sample_bit(evsel, REGS_USER); 1245 } 1246 1247 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1248 evsel__set_sample_bit(evsel, CPU); 1249 1250 /* 1251 * When the user explicitly disabled time don't force it here. 1252 */ 1253 if (opts->sample_time && 1254 (!perf_missing_features.sample_id_all && 1255 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1256 opts->sample_time_set))) 1257 evsel__set_sample_bit(evsel, TIME); 1258 1259 if (opts->raw_samples && !evsel->no_aux_samples) { 1260 evsel__set_sample_bit(evsel, TIME); 1261 evsel__set_sample_bit(evsel, RAW); 1262 evsel__set_sample_bit(evsel, CPU); 1263 } 1264 1265 if (opts->sample_address) 1266 evsel__set_sample_bit(evsel, DATA_SRC); 1267 1268 if (opts->sample_phys_addr) 1269 evsel__set_sample_bit(evsel, PHYS_ADDR); 1270 1271 if (opts->no_buffering) { 1272 attr->watermark = 0; 1273 attr->wakeup_events = 1; 1274 } 1275 if (opts->branch_stack && !evsel->no_aux_samples) { 1276 evsel__set_sample_bit(evsel, BRANCH_STACK); 1277 attr->branch_sample_type = opts->branch_stack; 1278 } 1279 1280 if (opts->sample_weight) 1281 arch_evsel__set_sample_weight(evsel); 1282 1283 attr->task = track; 1284 attr->mmap = track; 1285 attr->mmap2 = track && !perf_missing_features.mmap2; 1286 attr->comm = track; 1287 attr->build_id = track && opts->build_id; 1288 1289 /* 1290 * ksymbol is tracked separately with text poke because it needs to be 1291 * system wide and enabled immediately. 1292 */ 1293 if (!opts->text_poke) 1294 attr->ksymbol = track && !perf_missing_features.ksymbol; 1295 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1296 1297 if (opts->record_namespaces) 1298 attr->namespaces = track; 1299 1300 if (opts->record_cgroup) { 1301 attr->cgroup = track && !perf_missing_features.cgroup; 1302 evsel__set_sample_bit(evsel, CGROUP); 1303 } 1304 1305 if (opts->sample_data_page_size) 1306 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); 1307 1308 if (opts->sample_code_page_size) 1309 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); 1310 1311 if (opts->record_switch_events) 1312 attr->context_switch = track; 1313 1314 if (opts->sample_transaction) 1315 evsel__set_sample_bit(evsel, TRANSACTION); 1316 1317 if (opts->running_time) { 1318 evsel->core.attr.read_format |= 1319 PERF_FORMAT_TOTAL_TIME_ENABLED | 1320 PERF_FORMAT_TOTAL_TIME_RUNNING; 1321 } 1322 1323 /* 1324 * XXX see the function comment above 1325 * 1326 * Disabling only independent events or group leaders, 1327 * keeping group members enabled. 1328 */ 1329 if (evsel__is_group_leader(evsel)) 1330 attr->disabled = 1; 1331 1332 /* 1333 * Setting enable_on_exec for independent events and 1334 * group leaders for traced executed by perf. 1335 */ 1336 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1337 !opts->initial_delay) 1338 attr->enable_on_exec = 1; 1339 1340 if (evsel->immediate) { 1341 attr->disabled = 0; 1342 attr->enable_on_exec = 0; 1343 } 1344 1345 clockid = opts->clockid; 1346 if (opts->use_clockid) { 1347 attr->use_clockid = 1; 1348 attr->clockid = opts->clockid; 1349 } 1350 1351 if (evsel->precise_max) 1352 attr->precise_ip = 3; 1353 1354 if (opts->all_user) { 1355 attr->exclude_kernel = 1; 1356 attr->exclude_user = 0; 1357 } 1358 1359 if (opts->all_kernel) { 1360 attr->exclude_kernel = 0; 1361 attr->exclude_user = 1; 1362 } 1363 1364 if (evsel->core.own_cpus || evsel->unit) 1365 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1366 1367 /* 1368 * Apply event specific term settings, 1369 * it overloads any global configuration. 1370 */ 1371 evsel__apply_config_terms(evsel, opts, track); 1372 1373 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1374 1375 /* The --period option takes the precedence. */ 1376 if (opts->period_set) { 1377 if (opts->period) 1378 evsel__set_sample_bit(evsel, PERIOD); 1379 else 1380 evsel__reset_sample_bit(evsel, PERIOD); 1381 } 1382 1383 /* 1384 * A dummy event never triggers any actual counter and therefore 1385 * cannot be used with branch_stack. 1386 * 1387 * For initial_delay, a dummy event is added implicitly. 1388 * The software event will trigger -EOPNOTSUPP error out, 1389 * if BRANCH_STACK bit is set. 1390 */ 1391 if (evsel__is_dummy_event(evsel)) 1392 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1393 1394 if (evsel__is_offcpu_event(evsel)) 1395 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; 1396 1397 arch__post_evsel_config(evsel, attr); 1398 } 1399 1400 int evsel__set_filter(struct evsel *evsel, const char *filter) 1401 { 1402 char *new_filter = strdup(filter); 1403 1404 if (new_filter != NULL) { 1405 free(evsel->filter); 1406 evsel->filter = new_filter; 1407 return 0; 1408 } 1409 1410 return -1; 1411 } 1412 1413 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1414 { 1415 char *new_filter; 1416 1417 if (evsel->filter == NULL) 1418 return evsel__set_filter(evsel, filter); 1419 1420 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1421 free(evsel->filter); 1422 evsel->filter = new_filter; 1423 return 0; 1424 } 1425 1426 return -1; 1427 } 1428 1429 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1430 { 1431 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1432 } 1433 1434 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1435 { 1436 return evsel__append_filter(evsel, "%s,%s", filter); 1437 } 1438 1439 /* Caller has to clear disabled after going through all CPUs. */ 1440 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx) 1441 { 1442 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); 1443 } 1444 1445 int evsel__enable(struct evsel *evsel) 1446 { 1447 int err = perf_evsel__enable(&evsel->core); 1448 1449 if (!err) 1450 evsel->disabled = false; 1451 return err; 1452 } 1453 1454 /* Caller has to set disabled after going through all CPUs. */ 1455 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx) 1456 { 1457 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); 1458 } 1459 1460 int evsel__disable(struct evsel *evsel) 1461 { 1462 int err = perf_evsel__disable(&evsel->core); 1463 /* 1464 * We mark it disabled here so that tools that disable a event can 1465 * ignore events after they disable it. I.e. the ring buffer may have 1466 * already a few more events queued up before the kernel got the stop 1467 * request. 1468 */ 1469 if (!err) 1470 evsel->disabled = true; 1471 1472 return err; 1473 } 1474 1475 void free_config_terms(struct list_head *config_terms) 1476 { 1477 struct evsel_config_term *term, *h; 1478 1479 list_for_each_entry_safe(term, h, config_terms, list) { 1480 list_del_init(&term->list); 1481 if (term->free_str) 1482 zfree(&term->val.str); 1483 free(term); 1484 } 1485 } 1486 1487 static void evsel__free_config_terms(struct evsel *evsel) 1488 { 1489 free_config_terms(&evsel->config_terms); 1490 } 1491 1492 void evsel__exit(struct evsel *evsel) 1493 { 1494 assert(list_empty(&evsel->core.node)); 1495 assert(evsel->evlist == NULL); 1496 bpf_counter__destroy(evsel); 1497 evsel__free_counts(evsel); 1498 perf_evsel__free_fd(&evsel->core); 1499 perf_evsel__free_id(&evsel->core); 1500 evsel__free_config_terms(evsel); 1501 cgroup__put(evsel->cgrp); 1502 perf_cpu_map__put(evsel->core.cpus); 1503 perf_cpu_map__put(evsel->core.own_cpus); 1504 perf_thread_map__put(evsel->core.threads); 1505 zfree(&evsel->group_name); 1506 zfree(&evsel->name); 1507 zfree(&evsel->pmu_name); 1508 zfree(&evsel->unit); 1509 zfree(&evsel->metric_id); 1510 evsel__zero_per_pkg(evsel); 1511 hashmap__free(evsel->per_pkg_mask); 1512 evsel->per_pkg_mask = NULL; 1513 zfree(&evsel->metric_events); 1514 perf_evsel__object.fini(evsel); 1515 } 1516 1517 void evsel__delete(struct evsel *evsel) 1518 { 1519 evsel__exit(evsel); 1520 free(evsel); 1521 } 1522 1523 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread, 1524 struct perf_counts_values *count) 1525 { 1526 struct perf_counts_values tmp; 1527 1528 if (!evsel->prev_raw_counts) 1529 return; 1530 1531 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); 1532 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; 1533 1534 count->val = count->val - tmp.val; 1535 count->ena = count->ena - tmp.ena; 1536 count->run = count->run - tmp.run; 1537 } 1538 1539 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) 1540 { 1541 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); 1542 1543 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); 1544 } 1545 1546 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, 1547 u64 val, u64 ena, u64 run, u64 lost) 1548 { 1549 struct perf_counts_values *count; 1550 1551 count = perf_counts(counter->counts, cpu_map_idx, thread); 1552 1553 count->val = val; 1554 count->ena = ena; 1555 count->run = run; 1556 count->lost = lost; 1557 1558 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1559 } 1560 1561 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) 1562 { 1563 u64 read_format = leader->core.attr.read_format; 1564 struct sample_read_value *v; 1565 u64 nr, ena = 0, run = 0, lost = 0; 1566 1567 nr = *data++; 1568 1569 if (nr != (u64) leader->core.nr_members) 1570 return -EINVAL; 1571 1572 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1573 ena = *data++; 1574 1575 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1576 run = *data++; 1577 1578 v = (void *)data; 1579 sample_read_group__for_each(v, nr, read_format) { 1580 struct evsel *counter; 1581 1582 counter = evlist__id2evsel(leader->evlist, v->id); 1583 if (!counter) 1584 return -EINVAL; 1585 1586 if (read_format & PERF_FORMAT_LOST) 1587 lost = v->lost; 1588 1589 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); 1590 } 1591 1592 return 0; 1593 } 1594 1595 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread) 1596 { 1597 struct perf_stat_evsel *ps = leader->stats; 1598 u64 read_format = leader->core.attr.read_format; 1599 int size = perf_evsel__read_size(&leader->core); 1600 u64 *data = ps->group_data; 1601 1602 if (!(read_format & PERF_FORMAT_ID)) 1603 return -EINVAL; 1604 1605 if (!evsel__is_group_leader(leader)) 1606 return -EINVAL; 1607 1608 if (!data) { 1609 data = zalloc(size); 1610 if (!data) 1611 return -ENOMEM; 1612 1613 ps->group_data = data; 1614 } 1615 1616 if (FD(leader, cpu_map_idx, thread) < 0) 1617 return -EINVAL; 1618 1619 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) 1620 return -errno; 1621 1622 return evsel__process_group_data(leader, cpu_map_idx, thread, data); 1623 } 1624 1625 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) 1626 { 1627 u64 read_format = evsel->core.attr.read_format; 1628 1629 if (read_format & PERF_FORMAT_GROUP) 1630 return evsel__read_group(evsel, cpu_map_idx, thread); 1631 1632 return evsel__read_one(evsel, cpu_map_idx, thread); 1633 } 1634 1635 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) 1636 { 1637 struct perf_counts_values count; 1638 size_t nv = scale ? 3 : 1; 1639 1640 if (FD(evsel, cpu_map_idx, thread) < 0) 1641 return -EINVAL; 1642 1643 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) 1644 return -ENOMEM; 1645 1646 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) 1647 return -errno; 1648 1649 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); 1650 perf_counts_values__scale(&count, scale, NULL); 1651 *perf_counts(evsel->counts, cpu_map_idx, thread) = count; 1652 return 0; 1653 } 1654 1655 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, 1656 int cpu_map_idx) 1657 { 1658 struct perf_cpu cpu; 1659 1660 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); 1661 return perf_cpu_map__idx(other->core.cpus, cpu); 1662 } 1663 1664 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) 1665 { 1666 struct evsel *leader = evsel__leader(evsel); 1667 1668 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || 1669 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { 1670 return evsel__match_other_cpu(evsel, leader, cpu_map_idx); 1671 } 1672 1673 return cpu_map_idx; 1674 } 1675 1676 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) 1677 { 1678 struct evsel *leader = evsel__leader(evsel); 1679 int fd; 1680 1681 if (evsel__is_group_leader(evsel)) 1682 return -1; 1683 1684 /* 1685 * Leader must be already processed/open, 1686 * if not it's a bug. 1687 */ 1688 BUG_ON(!leader->core.fd); 1689 1690 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); 1691 if (cpu_map_idx == -1) 1692 return -1; 1693 1694 fd = FD(leader, cpu_map_idx, thread); 1695 BUG_ON(fd == -1); 1696 1697 return fd; 1698 } 1699 1700 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx) 1701 { 1702 for (int cpu = 0; cpu < nr_cpus; cpu++) 1703 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1704 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1705 } 1706 1707 static int update_fds(struct evsel *evsel, 1708 int nr_cpus, int cpu_map_idx, 1709 int nr_threads, int thread_idx) 1710 { 1711 struct evsel *pos; 1712 1713 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) 1714 return -EINVAL; 1715 1716 evlist__for_each_entry(evsel->evlist, pos) { 1717 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; 1718 1719 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1720 1721 /* 1722 * Since fds for next evsel has not been created, 1723 * there is no need to iterate whole event list. 1724 */ 1725 if (pos == evsel) 1726 break; 1727 } 1728 return 0; 1729 } 1730 1731 static bool evsel__ignore_missing_thread(struct evsel *evsel, 1732 int nr_cpus, int cpu_map_idx, 1733 struct perf_thread_map *threads, 1734 int thread, int err) 1735 { 1736 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1737 1738 if (!evsel->ignore_missing_thread) 1739 return false; 1740 1741 /* The system wide setup does not work with threads. */ 1742 if (evsel->core.system_wide) 1743 return false; 1744 1745 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1746 if (err != -ESRCH) 1747 return false; 1748 1749 /* If there's only one thread, let it fail. */ 1750 if (threads->nr == 1) 1751 return false; 1752 1753 /* 1754 * We should remove fd for missing_thread first 1755 * because thread_map__remove() will decrease threads->nr. 1756 */ 1757 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread)) 1758 return false; 1759 1760 if (thread_map__remove(threads, thread)) 1761 return false; 1762 1763 pr_warning("WARNING: Ignored open failure for pid %d\n", 1764 ignore_pid); 1765 return true; 1766 } 1767 1768 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1769 void *priv __maybe_unused) 1770 { 1771 return fprintf(fp, " %-32s %s\n", name, val); 1772 } 1773 1774 static void display_attr(struct perf_event_attr *attr) 1775 { 1776 if (verbose >= 2 || debug_peo_args) { 1777 fprintf(stderr, "%.60s\n", graph_dotted_line); 1778 fprintf(stderr, "perf_event_attr:\n"); 1779 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 1780 fprintf(stderr, "%.60s\n", graph_dotted_line); 1781 } 1782 } 1783 1784 bool evsel__precise_ip_fallback(struct evsel *evsel) 1785 { 1786 /* Do not try less precise if not requested. */ 1787 if (!evsel->precise_max) 1788 return false; 1789 1790 /* 1791 * We tried all the precise_ip values, and it's 1792 * still failing, so leave it to standard fallback. 1793 */ 1794 if (!evsel->core.attr.precise_ip) { 1795 evsel->core.attr.precise_ip = evsel->precise_ip_original; 1796 return false; 1797 } 1798 1799 if (!evsel->precise_ip_original) 1800 evsel->precise_ip_original = evsel->core.attr.precise_ip; 1801 1802 evsel->core.attr.precise_ip--; 1803 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 1804 display_attr(&evsel->core.attr); 1805 return true; 1806 } 1807 1808 static struct perf_cpu_map *empty_cpu_map; 1809 static struct perf_thread_map *empty_thread_map; 1810 1811 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 1812 struct perf_thread_map *threads) 1813 { 1814 int nthreads = perf_thread_map__nr(threads); 1815 1816 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 1817 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 1818 return -EINVAL; 1819 1820 if (cpus == NULL) { 1821 if (empty_cpu_map == NULL) { 1822 empty_cpu_map = perf_cpu_map__dummy_new(); 1823 if (empty_cpu_map == NULL) 1824 return -ENOMEM; 1825 } 1826 1827 cpus = empty_cpu_map; 1828 } 1829 1830 if (threads == NULL) { 1831 if (empty_thread_map == NULL) { 1832 empty_thread_map = thread_map__new_by_tid(-1); 1833 if (empty_thread_map == NULL) 1834 return -ENOMEM; 1835 } 1836 1837 threads = empty_thread_map; 1838 } 1839 1840 if (evsel->core.fd == NULL && 1841 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) 1842 return -ENOMEM; 1843 1844 evsel->open_flags = PERF_FLAG_FD_CLOEXEC; 1845 if (evsel->cgrp) 1846 evsel->open_flags |= PERF_FLAG_PID_CGROUP; 1847 1848 return 0; 1849 } 1850 1851 static void evsel__disable_missing_features(struct evsel *evsel) 1852 { 1853 if (perf_missing_features.read_lost) 1854 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST; 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.read_lost && 1907 (evsel->core.attr.read_format & PERF_FORMAT_LOST)) { 1908 perf_missing_features.read_lost = true; 1909 pr_debug2("switching off PERF_FORMAT_LOST support\n"); 1910 return true; 1911 } else if (!perf_missing_features.weight_struct && 1912 (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { 1913 perf_missing_features.weight_struct = true; 1914 pr_debug2("switching off weight struct support\n"); 1915 return true; 1916 } else if (!perf_missing_features.code_page_size && 1917 (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { 1918 perf_missing_features.code_page_size = true; 1919 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); 1920 return false; 1921 } else if (!perf_missing_features.data_page_size && 1922 (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { 1923 perf_missing_features.data_page_size = true; 1924 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); 1925 return false; 1926 } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { 1927 perf_missing_features.cgroup = true; 1928 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); 1929 return false; 1930 } else if (!perf_missing_features.branch_hw_idx && 1931 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { 1932 perf_missing_features.branch_hw_idx = true; 1933 pr_debug2("switching off branch HW index support\n"); 1934 return true; 1935 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 1936 perf_missing_features.aux_output = true; 1937 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); 1938 return false; 1939 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 1940 perf_missing_features.bpf = true; 1941 pr_debug2_peo("switching off bpf_event\n"); 1942 return true; 1943 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 1944 perf_missing_features.ksymbol = true; 1945 pr_debug2_peo("switching off ksymbol\n"); 1946 return true; 1947 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 1948 perf_missing_features.write_backward = true; 1949 pr_debug2_peo("switching off write_backward\n"); 1950 return false; 1951 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 1952 perf_missing_features.clockid_wrong = true; 1953 pr_debug2_peo("switching off clockid\n"); 1954 return true; 1955 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 1956 perf_missing_features.clockid = true; 1957 pr_debug2_peo("switching off use_clockid\n"); 1958 return true; 1959 } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { 1960 perf_missing_features.cloexec = true; 1961 pr_debug2_peo("switching off cloexec flag\n"); 1962 return true; 1963 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 1964 perf_missing_features.mmap2 = true; 1965 pr_debug2_peo("switching off mmap2\n"); 1966 return true; 1967 } else if (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) { 1968 if (evsel->pmu == NULL) 1969 evsel->pmu = evsel__find_pmu(evsel); 1970 1971 if (evsel->pmu) 1972 evsel->pmu->missing_features.exclude_guest = true; 1973 else { 1974 /* we cannot find PMU, disable attrs now */ 1975 evsel->core.attr.exclude_host = false; 1976 evsel->core.attr.exclude_guest = false; 1977 } 1978 1979 if (evsel->exclude_GH) { 1980 pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n"); 1981 return false; 1982 } 1983 if (!perf_missing_features.exclude_guest) { 1984 perf_missing_features.exclude_guest = true; 1985 pr_debug2_peo("switching off exclude_guest, exclude_host\n"); 1986 } 1987 return true; 1988 } else if (!perf_missing_features.sample_id_all) { 1989 perf_missing_features.sample_id_all = true; 1990 pr_debug2_peo("switching off sample_id_all\n"); 1991 return true; 1992 } else if (!perf_missing_features.lbr_flags && 1993 (evsel->core.attr.branch_sample_type & 1994 (PERF_SAMPLE_BRANCH_NO_CYCLES | 1995 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 1996 perf_missing_features.lbr_flags = true; 1997 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 1998 return true; 1999 } else if (!perf_missing_features.group_read && 2000 evsel->core.attr.inherit && 2001 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 2002 evsel__is_group_leader(evsel)) { 2003 perf_missing_features.group_read = true; 2004 pr_debug2_peo("switching off group read\n"); 2005 return true; 2006 } else { 2007 return false; 2008 } 2009 } 2010 2011 bool evsel__increase_rlimit(enum rlimit_action *set_rlimit) 2012 { 2013 int old_errno; 2014 struct rlimit l; 2015 2016 if (*set_rlimit < INCREASED_MAX) { 2017 old_errno = errno; 2018 2019 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 2020 if (*set_rlimit == NO_CHANGE) { 2021 l.rlim_cur = l.rlim_max; 2022 } else { 2023 l.rlim_cur = l.rlim_max + 1000; 2024 l.rlim_max = l.rlim_cur; 2025 } 2026 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 2027 (*set_rlimit) += 1; 2028 errno = old_errno; 2029 return true; 2030 } 2031 } 2032 errno = old_errno; 2033 } 2034 2035 return false; 2036 } 2037 2038 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 2039 struct perf_thread_map *threads, 2040 int start_cpu_map_idx, int end_cpu_map_idx) 2041 { 2042 int idx, thread, nthreads; 2043 int pid = -1, err, old_errno; 2044 enum rlimit_action set_rlimit = NO_CHANGE; 2045 2046 err = __evsel__prepare_open(evsel, cpus, threads); 2047 if (err) 2048 return err; 2049 2050 if (cpus == NULL) 2051 cpus = empty_cpu_map; 2052 2053 if (threads == NULL) 2054 threads = empty_thread_map; 2055 2056 nthreads = perf_thread_map__nr(threads); 2057 2058 if (evsel->cgrp) 2059 pid = evsel->cgrp->fd; 2060 2061 fallback_missing_features: 2062 evsel__disable_missing_features(evsel); 2063 2064 display_attr(&evsel->core.attr); 2065 2066 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { 2067 2068 for (thread = 0; thread < nthreads; thread++) { 2069 int fd, group_fd; 2070 retry_open: 2071 if (thread >= nthreads) 2072 break; 2073 2074 if (!evsel->cgrp && !evsel->core.system_wide) 2075 pid = perf_thread_map__pid(threads, thread); 2076 2077 group_fd = get_group_fd(evsel, idx, thread); 2078 2079 test_attr__ready(); 2080 2081 /* Debug message used by test scripts */ 2082 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 2083 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags); 2084 2085 fd = sys_perf_event_open(&evsel->core.attr, pid, 2086 perf_cpu_map__cpu(cpus, idx).cpu, 2087 group_fd, evsel->open_flags); 2088 2089 FD(evsel, idx, thread) = fd; 2090 2091 if (fd < 0) { 2092 err = -errno; 2093 2094 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 2095 err); 2096 goto try_fallback; 2097 } 2098 2099 bpf_counter__install_pe(evsel, idx, fd); 2100 2101 if (unlikely(test_attr__enabled)) { 2102 test_attr__open(&evsel->core.attr, pid, 2103 perf_cpu_map__cpu(cpus, idx), 2104 fd, group_fd, evsel->open_flags); 2105 } 2106 2107 /* Debug message used by test scripts */ 2108 pr_debug2_peo(" = %d\n", fd); 2109 2110 if (evsel->bpf_fd >= 0) { 2111 int evt_fd = fd; 2112 int bpf_fd = evsel->bpf_fd; 2113 2114 err = ioctl(evt_fd, 2115 PERF_EVENT_IOC_SET_BPF, 2116 bpf_fd); 2117 if (err && errno != EEXIST) { 2118 pr_err("failed to attach bpf fd %d: %s\n", 2119 bpf_fd, strerror(errno)); 2120 err = -EINVAL; 2121 goto out_close; 2122 } 2123 } 2124 2125 set_rlimit = NO_CHANGE; 2126 2127 /* 2128 * If we succeeded but had to kill clockid, fail and 2129 * have evsel__open_strerror() print us a nice error. 2130 */ 2131 if (perf_missing_features.clockid || 2132 perf_missing_features.clockid_wrong) { 2133 err = -EINVAL; 2134 goto out_close; 2135 } 2136 } 2137 } 2138 2139 return 0; 2140 2141 try_fallback: 2142 if (evsel__precise_ip_fallback(evsel)) 2143 goto retry_open; 2144 2145 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), 2146 idx, threads, thread, err)) { 2147 /* We just removed 1 thread, so lower the upper nthreads limit. */ 2148 nthreads--; 2149 2150 /* ... and pretend like nothing have happened. */ 2151 err = 0; 2152 goto retry_open; 2153 } 2154 /* 2155 * perf stat needs between 5 and 22 fds per CPU. When we run out 2156 * of them try to increase the limits. 2157 */ 2158 if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit)) 2159 goto retry_open; 2160 2161 if (err != -EINVAL || idx > 0 || thread > 0) 2162 goto out_close; 2163 2164 if (evsel__detect_missing_features(evsel)) 2165 goto fallback_missing_features; 2166 out_close: 2167 if (err) 2168 threads->err_thread = thread; 2169 2170 old_errno = errno; 2171 do { 2172 while (--thread >= 0) { 2173 if (FD(evsel, idx, thread) >= 0) 2174 close(FD(evsel, idx, thread)); 2175 FD(evsel, idx, thread) = -1; 2176 } 2177 thread = nthreads; 2178 } while (--idx >= 0); 2179 errno = old_errno; 2180 return err; 2181 } 2182 2183 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 2184 struct perf_thread_map *threads) 2185 { 2186 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2187 } 2188 2189 void evsel__close(struct evsel *evsel) 2190 { 2191 perf_evsel__close(&evsel->core); 2192 perf_evsel__free_id(&evsel->core); 2193 } 2194 2195 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx) 2196 { 2197 if (cpu_map_idx == -1) 2198 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus)); 2199 2200 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1); 2201 } 2202 2203 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 2204 { 2205 return evsel__open(evsel, NULL, threads); 2206 } 2207 2208 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 2209 const union perf_event *event, 2210 struct perf_sample *sample) 2211 { 2212 u64 type = evsel->core.attr.sample_type; 2213 const __u64 *array = event->sample.array; 2214 bool swapped = evsel->needs_swap; 2215 union u64_swap u; 2216 2217 array += ((event->header.size - 2218 sizeof(event->header)) / sizeof(u64)) - 1; 2219 2220 if (type & PERF_SAMPLE_IDENTIFIER) { 2221 sample->id = *array; 2222 array--; 2223 } 2224 2225 if (type & PERF_SAMPLE_CPU) { 2226 u.val64 = *array; 2227 if (swapped) { 2228 /* undo swap of u64, then swap on individual u32s */ 2229 u.val64 = bswap_64(u.val64); 2230 u.val32[0] = bswap_32(u.val32[0]); 2231 } 2232 2233 sample->cpu = u.val32[0]; 2234 array--; 2235 } 2236 2237 if (type & PERF_SAMPLE_STREAM_ID) { 2238 sample->stream_id = *array; 2239 array--; 2240 } 2241 2242 if (type & PERF_SAMPLE_ID) { 2243 sample->id = *array; 2244 array--; 2245 } 2246 2247 if (type & PERF_SAMPLE_TIME) { 2248 sample->time = *array; 2249 array--; 2250 } 2251 2252 if (type & PERF_SAMPLE_TID) { 2253 u.val64 = *array; 2254 if (swapped) { 2255 /* undo swap of u64, then swap on individual u32s */ 2256 u.val64 = bswap_64(u.val64); 2257 u.val32[0] = bswap_32(u.val32[0]); 2258 u.val32[1] = bswap_32(u.val32[1]); 2259 } 2260 2261 sample->pid = u.val32[0]; 2262 sample->tid = u.val32[1]; 2263 array--; 2264 } 2265 2266 return 0; 2267 } 2268 2269 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 2270 u64 size) 2271 { 2272 return size > max_size || offset + size > endp; 2273 } 2274 2275 #define OVERFLOW_CHECK(offset, size, max_size) \ 2276 do { \ 2277 if (overflow(endp, (max_size), (offset), (size))) \ 2278 return -EFAULT; \ 2279 } while (0) 2280 2281 #define OVERFLOW_CHECK_u64(offset) \ 2282 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 2283 2284 static int 2285 perf_event__check_size(union perf_event *event, unsigned int sample_size) 2286 { 2287 /* 2288 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 2289 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 2290 * check the format does not go past the end of the event. 2291 */ 2292 if (sample_size + sizeof(event->header) > event->header.size) 2293 return -EFAULT; 2294 2295 return 0; 2296 } 2297 2298 void __weak arch_perf_parse_sample_weight(struct perf_sample *data, 2299 const __u64 *array, 2300 u64 type __maybe_unused) 2301 { 2302 data->weight = *array; 2303 } 2304 2305 u64 evsel__bitfield_swap_branch_flags(u64 value) 2306 { 2307 u64 new_val = 0; 2308 2309 /* 2310 * branch_flags 2311 * union { 2312 * u64 values; 2313 * struct { 2314 * mispred:1 //target mispredicted 2315 * predicted:1 //target predicted 2316 * in_tx:1 //in transaction 2317 * abort:1 //transaction abort 2318 * cycles:16 //cycle count to last branch 2319 * type:4 //branch type 2320 * spec:2 //branch speculation info 2321 * new_type:4 //additional branch type 2322 * priv:3 //privilege level 2323 * reserved:31 2324 * } 2325 * } 2326 * 2327 * Avoid bswap64() the entire branch_flag.value, 2328 * as it has variable bit-field sizes. Instead the 2329 * macro takes the bit-field position/size, 2330 * swaps it based on the host endianness. 2331 */ 2332 if (host_is_bigendian()) { 2333 new_val = bitfield_swap(value, 0, 1); 2334 new_val |= bitfield_swap(value, 1, 1); 2335 new_val |= bitfield_swap(value, 2, 1); 2336 new_val |= bitfield_swap(value, 3, 1); 2337 new_val |= bitfield_swap(value, 4, 16); 2338 new_val |= bitfield_swap(value, 20, 4); 2339 new_val |= bitfield_swap(value, 24, 2); 2340 new_val |= bitfield_swap(value, 26, 4); 2341 new_val |= bitfield_swap(value, 30, 3); 2342 new_val |= bitfield_swap(value, 33, 31); 2343 } else { 2344 new_val = bitfield_swap(value, 63, 1); 2345 new_val |= bitfield_swap(value, 62, 1); 2346 new_val |= bitfield_swap(value, 61, 1); 2347 new_val |= bitfield_swap(value, 60, 1); 2348 new_val |= bitfield_swap(value, 44, 16); 2349 new_val |= bitfield_swap(value, 40, 4); 2350 new_val |= bitfield_swap(value, 38, 2); 2351 new_val |= bitfield_swap(value, 34, 4); 2352 new_val |= bitfield_swap(value, 31, 3); 2353 new_val |= bitfield_swap(value, 0, 31); 2354 } 2355 2356 return new_val; 2357 } 2358 2359 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 2360 struct perf_sample *data) 2361 { 2362 u64 type = evsel->core.attr.sample_type; 2363 bool swapped = evsel->needs_swap; 2364 const __u64 *array; 2365 u16 max_size = event->header.size; 2366 const void *endp = (void *)event + max_size; 2367 u64 sz; 2368 2369 /* 2370 * used for cross-endian analysis. See git commit 65014ab3 2371 * for why this goofiness is needed. 2372 */ 2373 union u64_swap u; 2374 2375 memset(data, 0, sizeof(*data)); 2376 data->cpu = data->pid = data->tid = -1; 2377 data->stream_id = data->id = data->time = -1ULL; 2378 data->period = evsel->core.attr.sample_period; 2379 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 2380 data->misc = event->header.misc; 2381 data->id = -1ULL; 2382 data->data_src = PERF_MEM_DATA_SRC_NONE; 2383 data->vcpu = -1; 2384 2385 if (event->header.type != PERF_RECORD_SAMPLE) { 2386 if (!evsel->core.attr.sample_id_all) 2387 return 0; 2388 return perf_evsel__parse_id_sample(evsel, event, data); 2389 } 2390 2391 array = event->sample.array; 2392 2393 if (perf_event__check_size(event, evsel->sample_size)) 2394 return -EFAULT; 2395 2396 if (type & PERF_SAMPLE_IDENTIFIER) { 2397 data->id = *array; 2398 array++; 2399 } 2400 2401 if (type & PERF_SAMPLE_IP) { 2402 data->ip = *array; 2403 array++; 2404 } 2405 2406 if (type & PERF_SAMPLE_TID) { 2407 u.val64 = *array; 2408 if (swapped) { 2409 /* undo swap of u64, then swap on individual u32s */ 2410 u.val64 = bswap_64(u.val64); 2411 u.val32[0] = bswap_32(u.val32[0]); 2412 u.val32[1] = bswap_32(u.val32[1]); 2413 } 2414 2415 data->pid = u.val32[0]; 2416 data->tid = u.val32[1]; 2417 array++; 2418 } 2419 2420 if (type & PERF_SAMPLE_TIME) { 2421 data->time = *array; 2422 array++; 2423 } 2424 2425 if (type & PERF_SAMPLE_ADDR) { 2426 data->addr = *array; 2427 array++; 2428 } 2429 2430 if (type & PERF_SAMPLE_ID) { 2431 data->id = *array; 2432 array++; 2433 } 2434 2435 if (type & PERF_SAMPLE_STREAM_ID) { 2436 data->stream_id = *array; 2437 array++; 2438 } 2439 2440 if (type & PERF_SAMPLE_CPU) { 2441 2442 u.val64 = *array; 2443 if (swapped) { 2444 /* undo swap of u64, then swap on individual u32s */ 2445 u.val64 = bswap_64(u.val64); 2446 u.val32[0] = bswap_32(u.val32[0]); 2447 } 2448 2449 data->cpu = u.val32[0]; 2450 array++; 2451 } 2452 2453 if (type & PERF_SAMPLE_PERIOD) { 2454 data->period = *array; 2455 array++; 2456 } 2457 2458 if (type & PERF_SAMPLE_READ) { 2459 u64 read_format = evsel->core.attr.read_format; 2460 2461 OVERFLOW_CHECK_u64(array); 2462 if (read_format & PERF_FORMAT_GROUP) 2463 data->read.group.nr = *array; 2464 else 2465 data->read.one.value = *array; 2466 2467 array++; 2468 2469 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2470 OVERFLOW_CHECK_u64(array); 2471 data->read.time_enabled = *array; 2472 array++; 2473 } 2474 2475 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2476 OVERFLOW_CHECK_u64(array); 2477 data->read.time_running = *array; 2478 array++; 2479 } 2480 2481 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2482 if (read_format & PERF_FORMAT_GROUP) { 2483 const u64 max_group_nr = UINT64_MAX / 2484 sizeof(struct sample_read_value); 2485 2486 if (data->read.group.nr > max_group_nr) 2487 return -EFAULT; 2488 2489 sz = data->read.group.nr * sample_read_value_size(read_format); 2490 OVERFLOW_CHECK(array, sz, max_size); 2491 data->read.group.values = 2492 (struct sample_read_value *)array; 2493 array = (void *)array + sz; 2494 } else { 2495 OVERFLOW_CHECK_u64(array); 2496 data->read.one.id = *array; 2497 array++; 2498 2499 if (read_format & PERF_FORMAT_LOST) { 2500 OVERFLOW_CHECK_u64(array); 2501 data->read.one.lost = *array; 2502 array++; 2503 } 2504 } 2505 } 2506 2507 if (type & PERF_SAMPLE_CALLCHAIN) { 2508 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2509 2510 OVERFLOW_CHECK_u64(array); 2511 data->callchain = (struct ip_callchain *)array++; 2512 if (data->callchain->nr > max_callchain_nr) 2513 return -EFAULT; 2514 sz = data->callchain->nr * sizeof(u64); 2515 OVERFLOW_CHECK(array, sz, max_size); 2516 array = (void *)array + sz; 2517 } 2518 2519 if (type & PERF_SAMPLE_RAW) { 2520 OVERFLOW_CHECK_u64(array); 2521 u.val64 = *array; 2522 2523 /* 2524 * Undo swap of u64, then swap on individual u32s, 2525 * get the size of the raw area and undo all of the 2526 * swap. The pevent interface handles endianness by 2527 * itself. 2528 */ 2529 if (swapped) { 2530 u.val64 = bswap_64(u.val64); 2531 u.val32[0] = bswap_32(u.val32[0]); 2532 u.val32[1] = bswap_32(u.val32[1]); 2533 } 2534 data->raw_size = u.val32[0]; 2535 2536 /* 2537 * The raw data is aligned on 64bits including the 2538 * u32 size, so it's safe to use mem_bswap_64. 2539 */ 2540 if (swapped) 2541 mem_bswap_64((void *) array, data->raw_size); 2542 2543 array = (void *)array + sizeof(u32); 2544 2545 OVERFLOW_CHECK(array, data->raw_size, max_size); 2546 data->raw_data = (void *)array; 2547 array = (void *)array + data->raw_size; 2548 } 2549 2550 if (type & PERF_SAMPLE_BRANCH_STACK) { 2551 const u64 max_branch_nr = UINT64_MAX / 2552 sizeof(struct branch_entry); 2553 struct branch_entry *e; 2554 unsigned int i; 2555 2556 OVERFLOW_CHECK_u64(array); 2557 data->branch_stack = (struct branch_stack *)array++; 2558 2559 if (data->branch_stack->nr > max_branch_nr) 2560 return -EFAULT; 2561 2562 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2563 if (evsel__has_branch_hw_idx(evsel)) { 2564 sz += sizeof(u64); 2565 e = &data->branch_stack->entries[0]; 2566 } else { 2567 data->no_hw_idx = true; 2568 /* 2569 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, 2570 * only nr and entries[] will be output by kernel. 2571 */ 2572 e = (struct branch_entry *)&data->branch_stack->hw_idx; 2573 } 2574 2575 if (swapped) { 2576 /* 2577 * struct branch_flag does not have endian 2578 * specific bit field definition. And bswap 2579 * will not resolve the issue, since these 2580 * are bit fields. 2581 * 2582 * evsel__bitfield_swap_branch_flags() uses a 2583 * bitfield_swap macro to swap the bit position 2584 * based on the host endians. 2585 */ 2586 for (i = 0; i < data->branch_stack->nr; i++, e++) 2587 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); 2588 } 2589 2590 OVERFLOW_CHECK(array, sz, max_size); 2591 array = (void *)array + sz; 2592 } 2593 2594 if (type & PERF_SAMPLE_REGS_USER) { 2595 OVERFLOW_CHECK_u64(array); 2596 data->user_regs.abi = *array; 2597 array++; 2598 2599 if (data->user_regs.abi) { 2600 u64 mask = evsel->core.attr.sample_regs_user; 2601 2602 sz = hweight64(mask) * sizeof(u64); 2603 OVERFLOW_CHECK(array, sz, max_size); 2604 data->user_regs.mask = mask; 2605 data->user_regs.regs = (u64 *)array; 2606 array = (void *)array + sz; 2607 } 2608 } 2609 2610 if (type & PERF_SAMPLE_STACK_USER) { 2611 OVERFLOW_CHECK_u64(array); 2612 sz = *array++; 2613 2614 data->user_stack.offset = ((char *)(array - 1) 2615 - (char *) event); 2616 2617 if (!sz) { 2618 data->user_stack.size = 0; 2619 } else { 2620 OVERFLOW_CHECK(array, sz, max_size); 2621 data->user_stack.data = (char *)array; 2622 array = (void *)array + sz; 2623 OVERFLOW_CHECK_u64(array); 2624 data->user_stack.size = *array++; 2625 if (WARN_ONCE(data->user_stack.size > sz, 2626 "user stack dump failure\n")) 2627 return -EFAULT; 2628 } 2629 } 2630 2631 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 2632 OVERFLOW_CHECK_u64(array); 2633 arch_perf_parse_sample_weight(data, array, type); 2634 array++; 2635 } 2636 2637 if (type & PERF_SAMPLE_DATA_SRC) { 2638 OVERFLOW_CHECK_u64(array); 2639 data->data_src = *array; 2640 array++; 2641 } 2642 2643 if (type & PERF_SAMPLE_TRANSACTION) { 2644 OVERFLOW_CHECK_u64(array); 2645 data->transaction = *array; 2646 array++; 2647 } 2648 2649 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2650 if (type & PERF_SAMPLE_REGS_INTR) { 2651 OVERFLOW_CHECK_u64(array); 2652 data->intr_regs.abi = *array; 2653 array++; 2654 2655 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2656 u64 mask = evsel->core.attr.sample_regs_intr; 2657 2658 sz = hweight64(mask) * sizeof(u64); 2659 OVERFLOW_CHECK(array, sz, max_size); 2660 data->intr_regs.mask = mask; 2661 data->intr_regs.regs = (u64 *)array; 2662 array = (void *)array + sz; 2663 } 2664 } 2665 2666 data->phys_addr = 0; 2667 if (type & PERF_SAMPLE_PHYS_ADDR) { 2668 data->phys_addr = *array; 2669 array++; 2670 } 2671 2672 data->cgroup = 0; 2673 if (type & PERF_SAMPLE_CGROUP) { 2674 data->cgroup = *array; 2675 array++; 2676 } 2677 2678 data->data_page_size = 0; 2679 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 2680 data->data_page_size = *array; 2681 array++; 2682 } 2683 2684 data->code_page_size = 0; 2685 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 2686 data->code_page_size = *array; 2687 array++; 2688 } 2689 2690 if (type & PERF_SAMPLE_AUX) { 2691 OVERFLOW_CHECK_u64(array); 2692 sz = *array++; 2693 2694 OVERFLOW_CHECK(array, sz, max_size); 2695 /* Undo swap of data */ 2696 if (swapped) 2697 mem_bswap_64((char *)array, sz); 2698 data->aux_sample.size = sz; 2699 data->aux_sample.data = (char *)array; 2700 array = (void *)array + sz; 2701 } 2702 2703 return 0; 2704 } 2705 2706 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 2707 u64 *timestamp) 2708 { 2709 u64 type = evsel->core.attr.sample_type; 2710 const __u64 *array; 2711 2712 if (!(type & PERF_SAMPLE_TIME)) 2713 return -1; 2714 2715 if (event->header.type != PERF_RECORD_SAMPLE) { 2716 struct perf_sample data = { 2717 .time = -1ULL, 2718 }; 2719 2720 if (!evsel->core.attr.sample_id_all) 2721 return -1; 2722 if (perf_evsel__parse_id_sample(evsel, event, &data)) 2723 return -1; 2724 2725 *timestamp = data.time; 2726 return 0; 2727 } 2728 2729 array = event->sample.array; 2730 2731 if (perf_event__check_size(event, evsel->sample_size)) 2732 return -EFAULT; 2733 2734 if (type & PERF_SAMPLE_IDENTIFIER) 2735 array++; 2736 2737 if (type & PERF_SAMPLE_IP) 2738 array++; 2739 2740 if (type & PERF_SAMPLE_TID) 2741 array++; 2742 2743 if (type & PERF_SAMPLE_TIME) 2744 *timestamp = *array; 2745 2746 return 0; 2747 } 2748 2749 u16 evsel__id_hdr_size(struct evsel *evsel) 2750 { 2751 u64 sample_type = evsel->core.attr.sample_type; 2752 u16 size = 0; 2753 2754 if (sample_type & PERF_SAMPLE_TID) 2755 size += sizeof(u64); 2756 2757 if (sample_type & PERF_SAMPLE_TIME) 2758 size += sizeof(u64); 2759 2760 if (sample_type & PERF_SAMPLE_ID) 2761 size += sizeof(u64); 2762 2763 if (sample_type & PERF_SAMPLE_STREAM_ID) 2764 size += sizeof(u64); 2765 2766 if (sample_type & PERF_SAMPLE_CPU) 2767 size += sizeof(u64); 2768 2769 if (sample_type & PERF_SAMPLE_IDENTIFIER) 2770 size += sizeof(u64); 2771 2772 return size; 2773 } 2774 2775 #ifdef HAVE_LIBTRACEEVENT 2776 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 2777 { 2778 return tep_find_field(evsel->tp_format, name); 2779 } 2780 2781 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 2782 { 2783 struct tep_format_field *field = evsel__field(evsel, name); 2784 int offset; 2785 2786 if (!field) 2787 return NULL; 2788 2789 offset = field->offset; 2790 2791 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 2792 offset = *(int *)(sample->raw_data + field->offset); 2793 offset &= 0xffff; 2794 if (tep_field_is_relative(field->flags)) 2795 offset += field->offset + field->size; 2796 } 2797 2798 return sample->raw_data + offset; 2799 } 2800 2801 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 2802 bool needs_swap) 2803 { 2804 u64 value; 2805 void *ptr = sample->raw_data + field->offset; 2806 2807 switch (field->size) { 2808 case 1: 2809 return *(u8 *)ptr; 2810 case 2: 2811 value = *(u16 *)ptr; 2812 break; 2813 case 4: 2814 value = *(u32 *)ptr; 2815 break; 2816 case 8: 2817 memcpy(&value, ptr, sizeof(u64)); 2818 break; 2819 default: 2820 return 0; 2821 } 2822 2823 if (!needs_swap) 2824 return value; 2825 2826 switch (field->size) { 2827 case 2: 2828 return bswap_16(value); 2829 case 4: 2830 return bswap_32(value); 2831 case 8: 2832 return bswap_64(value); 2833 default: 2834 return 0; 2835 } 2836 2837 return 0; 2838 } 2839 2840 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 2841 { 2842 struct tep_format_field *field = evsel__field(evsel, name); 2843 2844 if (!field) 2845 return 0; 2846 2847 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 2848 } 2849 #endif 2850 2851 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize) 2852 { 2853 int paranoid; 2854 2855 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2856 evsel->core.attr.type == PERF_TYPE_HARDWARE && 2857 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2858 /* 2859 * If it's cycles then fall back to hrtimer based 2860 * cpu-clock-tick sw counter, which is always available even if 2861 * no PMU support. 2862 * 2863 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2864 * b0a873e). 2865 */ 2866 scnprintf(msg, msgsize, "%s", 2867 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2868 2869 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 2870 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK; 2871 2872 zfree(&evsel->name); 2873 return true; 2874 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 2875 (paranoid = perf_event_paranoid()) > 1) { 2876 const char *name = evsel__name(evsel); 2877 char *new_name; 2878 const char *sep = ":"; 2879 2880 /* If event has exclude user then don't exclude kernel. */ 2881 if (evsel->core.attr.exclude_user) 2882 return false; 2883 2884 /* Is there already the separator in the name. */ 2885 if (strchr(name, '/') || 2886 (strchr(name, ':') && !evsel->is_libpfm_event)) 2887 sep = ""; 2888 2889 if (asprintf(&new_name, "%s%su", name, sep) < 0) 2890 return false; 2891 2892 if (evsel->name) 2893 free(evsel->name); 2894 evsel->name = new_name; 2895 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 2896 "to fall back to excluding kernel and hypervisor " 2897 " samples", paranoid); 2898 evsel->core.attr.exclude_kernel = 1; 2899 evsel->core.attr.exclude_hv = 1; 2900 2901 return true; 2902 } 2903 2904 return false; 2905 } 2906 2907 static bool find_process(const char *name) 2908 { 2909 size_t len = strlen(name); 2910 DIR *dir; 2911 struct dirent *d; 2912 int ret = -1; 2913 2914 dir = opendir(procfs__mountpoint()); 2915 if (!dir) 2916 return false; 2917 2918 /* Walk through the directory. */ 2919 while (ret && (d = readdir(dir)) != NULL) { 2920 char path[PATH_MAX]; 2921 char *data; 2922 size_t size; 2923 2924 if ((d->d_type != DT_DIR) || 2925 !strcmp(".", d->d_name) || 2926 !strcmp("..", d->d_name)) 2927 continue; 2928 2929 scnprintf(path, sizeof(path), "%s/%s/comm", 2930 procfs__mountpoint(), d->d_name); 2931 2932 if (filename__read_str(path, &data, &size)) 2933 continue; 2934 2935 ret = strncmp(name, data, len); 2936 free(data); 2937 } 2938 2939 closedir(dir); 2940 return ret ? false : true; 2941 } 2942 2943 static bool is_amd(const char *arch, const char *cpuid) 2944 { 2945 return arch && !strcmp("x86", arch) && cpuid && strstarts(cpuid, "AuthenticAMD"); 2946 } 2947 2948 static bool is_amd_ibs(struct evsel *evsel) 2949 { 2950 return evsel->core.attr.precise_ip 2951 || (evsel->pmu_name && !strncmp(evsel->pmu_name, "ibs", 3)); 2952 } 2953 2954 int evsel__open_strerror(struct evsel *evsel, struct target *target, 2955 int err, char *msg, size_t size) 2956 { 2957 struct perf_env *env = evsel__env(evsel); 2958 const char *arch = perf_env__arch(env); 2959 const char *cpuid = perf_env__cpuid(env); 2960 char sbuf[STRERR_BUFSIZE]; 2961 int printed = 0, enforced = 0; 2962 2963 switch (err) { 2964 case EPERM: 2965 case EACCES: 2966 printed += scnprintf(msg + printed, size - printed, 2967 "Access to performance monitoring and observability operations is limited.\n"); 2968 2969 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 2970 if (enforced) { 2971 printed += scnprintf(msg + printed, size - printed, 2972 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 2973 "monitoring and observability operations. Inspect system audit records for\n" 2974 "more perf_event access control information and adjusting the policy.\n"); 2975 } 2976 } 2977 2978 if (err == EPERM) 2979 printed += scnprintf(msg, size, 2980 "No permission to enable %s event.\n\n", evsel__name(evsel)); 2981 2982 return scnprintf(msg + printed, size - printed, 2983 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 2984 "access to performance monitoring and observability operations for processes\n" 2985 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 2986 "More information can be found at 'Perf events and tool security' document:\n" 2987 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 2988 "perf_event_paranoid setting is %d:\n" 2989 " -1: Allow use of (almost) all events by all users\n" 2990 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 2991 ">= 0: Disallow raw and ftrace function tracepoint access\n" 2992 ">= 1: Disallow CPU event access\n" 2993 ">= 2: Disallow kernel profiling\n" 2994 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 2995 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 2996 perf_event_paranoid()); 2997 case ENOENT: 2998 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 2999 case EMFILE: 3000 return scnprintf(msg, size, "%s", 3001 "Too many events are opened.\n" 3002 "Probably the maximum number of open file descriptors has been reached.\n" 3003 "Hint: Try again after reducing the number of events.\n" 3004 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 3005 case ENOMEM: 3006 if (evsel__has_callchain(evsel) && 3007 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 3008 return scnprintf(msg, size, 3009 "Not enough memory to setup event with callchain.\n" 3010 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 3011 "Hint: Current value: %d", sysctl__max_stack()); 3012 break; 3013 case ENODEV: 3014 if (target->cpu_list) 3015 return scnprintf(msg, size, "%s", 3016 "No such device - did you specify an out-of-range profile CPU?"); 3017 break; 3018 case EOPNOTSUPP: 3019 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) 3020 return scnprintf(msg, size, 3021 "%s: PMU Hardware or event type doesn't support branch stack sampling.", 3022 evsel__name(evsel)); 3023 if (evsel->core.attr.aux_output) 3024 return scnprintf(msg, size, 3025 "%s: PMU Hardware doesn't support 'aux_output' feature", 3026 evsel__name(evsel)); 3027 if (evsel->core.attr.sample_period != 0) 3028 return scnprintf(msg, size, 3029 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 3030 evsel__name(evsel)); 3031 if (evsel->core.attr.precise_ip) 3032 return scnprintf(msg, size, "%s", 3033 "\'precise\' request may not be supported. Try removing 'p' modifier."); 3034 #if defined(__i386__) || defined(__x86_64__) 3035 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 3036 return scnprintf(msg, size, "%s", 3037 "No hardware sampling interrupt available.\n"); 3038 #endif 3039 break; 3040 case EBUSY: 3041 if (find_process("oprofiled")) 3042 return scnprintf(msg, size, 3043 "The PMU counters are busy/taken by another profiler.\n" 3044 "We found oprofile daemon running, please stop it and try again."); 3045 break; 3046 case EINVAL: 3047 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) 3048 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); 3049 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) 3050 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); 3051 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 3052 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 3053 if (perf_missing_features.clockid) 3054 return scnprintf(msg, size, "clockid feature not supported."); 3055 if (perf_missing_features.clockid_wrong) 3056 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 3057 if (perf_missing_features.aux_output) 3058 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 3059 if (!target__has_cpu(target)) 3060 return scnprintf(msg, size, 3061 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", 3062 evsel__name(evsel)); 3063 if (is_amd(arch, cpuid)) { 3064 if (is_amd_ibs(evsel)) { 3065 if (evsel->core.attr.exclude_kernel) 3066 return scnprintf(msg, size, 3067 "AMD IBS can't exclude kernel events. Try running at a higher privilege level."); 3068 if (!evsel->core.system_wide) 3069 return scnprintf(msg, size, 3070 "AMD IBS may only be available in system-wide/per-cpu mode. Try using -a, or -C and workload affinity"); 3071 } 3072 } 3073 3074 break; 3075 case ENODATA: 3076 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " 3077 "Please add an auxiliary event in front of the load latency event."); 3078 default: 3079 break; 3080 } 3081 3082 return scnprintf(msg, size, 3083 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 3084 "/bin/dmesg | grep -i perf may provide additional information.\n", 3085 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel)); 3086 } 3087 3088 struct perf_env *evsel__env(struct evsel *evsel) 3089 { 3090 if (evsel && evsel->evlist && evsel->evlist->env) 3091 return evsel->evlist->env; 3092 return &perf_env; 3093 } 3094 3095 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 3096 { 3097 int cpu_map_idx, thread; 3098 3099 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { 3100 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 3101 thread++) { 3102 int fd = FD(evsel, cpu_map_idx, thread); 3103 3104 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 3105 cpu_map_idx, thread, fd) < 0) 3106 return -1; 3107 } 3108 } 3109 3110 return 0; 3111 } 3112 3113 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 3114 { 3115 struct perf_cpu_map *cpus = evsel->core.cpus; 3116 struct perf_thread_map *threads = evsel->core.threads; 3117 3118 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr)) 3119 return -ENOMEM; 3120 3121 return store_evsel_ids(evsel, evlist); 3122 } 3123 3124 void evsel__zero_per_pkg(struct evsel *evsel) 3125 { 3126 struct hashmap_entry *cur; 3127 size_t bkt; 3128 3129 if (evsel->per_pkg_mask) { 3130 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) 3131 free((void *)cur->pkey); 3132 3133 hashmap__clear(evsel->per_pkg_mask); 3134 } 3135 } 3136 3137 bool evsel__is_hybrid(const struct evsel *evsel) 3138 { 3139 return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name); 3140 } 3141 3142 struct evsel *evsel__leader(struct evsel *evsel) 3143 { 3144 return container_of(evsel->core.leader, struct evsel, core); 3145 } 3146 3147 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) 3148 { 3149 return evsel->core.leader == &leader->core; 3150 } 3151 3152 bool evsel__is_leader(struct evsel *evsel) 3153 { 3154 return evsel__has_leader(evsel, evsel); 3155 } 3156 3157 void evsel__set_leader(struct evsel *evsel, struct evsel *leader) 3158 { 3159 evsel->core.leader = &leader->core; 3160 } 3161 3162 int evsel__source_count(const struct evsel *evsel) 3163 { 3164 struct evsel *pos; 3165 int count = 0; 3166 3167 evlist__for_each_entry(evsel->evlist, pos) { 3168 if (pos->metric_leader == evsel) 3169 count++; 3170 } 3171 return count; 3172 } 3173 3174 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) 3175 { 3176 return false; 3177 } 3178 3179 /* 3180 * Remove an event from a given group (leader). 3181 * Some events, e.g., perf metrics Topdown events, 3182 * must always be grouped. Ignore the events. 3183 */ 3184 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) 3185 { 3186 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { 3187 evsel__set_leader(evsel, evsel); 3188 evsel->core.nr_members = 0; 3189 leader->core.nr_members--; 3190 } 3191 } 3192