1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 4 * 5 * Parts came from builtin-{top,stat,record}.c, see those files for further 6 * copyright notes. 7 */ 8 9 #include <byteswap.h> 10 #include <errno.h> 11 #include <inttypes.h> 12 #include <linux/bitops.h> 13 #include <api/fs/fs.h> 14 #include <api/fs/tracing_path.h> 15 #include <traceevent/event-parse.h> 16 #include <linux/hw_breakpoint.h> 17 #include <linux/perf_event.h> 18 #include <linux/compiler.h> 19 #include <linux/err.h> 20 #include <linux/zalloc.h> 21 #include <sys/ioctl.h> 22 #include <sys/resource.h> 23 #include <sys/types.h> 24 #include <dirent.h> 25 #include <stdlib.h> 26 #include <perf/evsel.h> 27 #include "asm/bug.h" 28 #include "bpf_counter.h" 29 #include "callchain.h" 30 #include "cgroup.h" 31 #include "counts.h" 32 #include "event.h" 33 #include "evsel.h" 34 #include "util/env.h" 35 #include "util/evsel_config.h" 36 #include "util/evsel_fprintf.h" 37 #include "evlist.h" 38 #include <perf/cpumap.h> 39 #include "thread_map.h" 40 #include "target.h" 41 #include "perf_regs.h" 42 #include "record.h" 43 #include "debug.h" 44 #include "trace-event.h" 45 #include "stat.h" 46 #include "string2.h" 47 #include "memswap.h" 48 #include "util.h" 49 #ifdef HAVE_LIBBPF_SUPPORT 50 #include <bpf/hashmap.h> 51 #else 52 #include "util/hashmap.h" 53 #endif 54 #include "pmu-hybrid.h" 55 #include "off_cpu.h" 56 #include "../perf-sys.h" 57 #include "util/parse-branch-options.h" 58 #include <internal/xyarray.h> 59 #include <internal/lib.h> 60 61 #include <linux/ctype.h> 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_expr = NULL; 289 evsel->metric_name = NULL; 290 evsel->metric_events = NULL; 291 evsel->per_pkg_mask = NULL; 292 evsel->collect_stat = false; 293 evsel->pmu_name = NULL; 294 } 295 296 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 297 { 298 struct evsel *evsel = zalloc(perf_evsel__object.size); 299 300 if (!evsel) 301 return NULL; 302 evsel__init(evsel, attr, idx); 303 304 if (evsel__is_bpf_output(evsel) && !attr->sample_type) { 305 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 306 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 307 evsel->core.attr.sample_period = 1; 308 } 309 310 if (evsel__is_clock(evsel)) { 311 free((char *)evsel->unit); 312 evsel->unit = strdup("msec"); 313 evsel->scale = 1e-6; 314 } 315 316 return evsel; 317 } 318 319 static bool perf_event_can_profile_kernel(void) 320 { 321 return perf_event_paranoid_check(1); 322 } 323 324 struct evsel *evsel__new_cycles(bool precise __maybe_unused, __u32 type, __u64 config) 325 { 326 struct perf_event_attr attr = { 327 .type = type, 328 .config = config, 329 .exclude_kernel = !perf_event_can_profile_kernel(), 330 }; 331 struct evsel *evsel; 332 333 event_attr_init(&attr); 334 335 /* 336 * Now let the usual logic to set up the perf_event_attr defaults 337 * to kick in when we return and before perf_evsel__open() is called. 338 */ 339 evsel = evsel__new(&attr); 340 if (evsel == NULL) 341 goto out; 342 343 arch_evsel__fixup_new_cycles(&evsel->core.attr); 344 345 evsel->precise_max = true; 346 347 /* use asprintf() because free(evsel) assumes name is allocated */ 348 if (asprintf(&evsel->name, "cycles%s%s%.*s", 349 (attr.precise_ip || attr.exclude_kernel) ? ":" : "", 350 attr.exclude_kernel ? "u" : "", 351 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0) 352 goto error_free; 353 out: 354 return evsel; 355 error_free: 356 evsel__delete(evsel); 357 evsel = NULL; 358 goto out; 359 } 360 361 int copy_config_terms(struct list_head *dst, struct list_head *src) 362 { 363 struct evsel_config_term *pos, *tmp; 364 365 list_for_each_entry(pos, src, list) { 366 tmp = malloc(sizeof(*tmp)); 367 if (tmp == NULL) 368 return -ENOMEM; 369 370 *tmp = *pos; 371 if (tmp->free_str) { 372 tmp->val.str = strdup(pos->val.str); 373 if (tmp->val.str == NULL) { 374 free(tmp); 375 return -ENOMEM; 376 } 377 } 378 list_add_tail(&tmp->list, dst); 379 } 380 return 0; 381 } 382 383 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) 384 { 385 return copy_config_terms(&dst->config_terms, &src->config_terms); 386 } 387 388 /** 389 * evsel__clone - create a new evsel copied from @orig 390 * @orig: original evsel 391 * 392 * The assumption is that @orig is not configured nor opened yet. 393 * So we only care about the attributes that can be set while it's parsed. 394 */ 395 struct evsel *evsel__clone(struct evsel *orig) 396 { 397 struct evsel *evsel; 398 399 BUG_ON(orig->core.fd); 400 BUG_ON(orig->counts); 401 BUG_ON(orig->priv); 402 BUG_ON(orig->per_pkg_mask); 403 404 /* cannot handle BPF objects for now */ 405 if (orig->bpf_obj) 406 return NULL; 407 408 evsel = evsel__new(&orig->core.attr); 409 if (evsel == NULL) 410 return NULL; 411 412 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus); 413 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus); 414 evsel->core.threads = perf_thread_map__get(orig->core.threads); 415 evsel->core.nr_members = orig->core.nr_members; 416 evsel->core.system_wide = orig->core.system_wide; 417 evsel->core.requires_cpu = orig->core.requires_cpu; 418 419 if (orig->name) { 420 evsel->name = strdup(orig->name); 421 if (evsel->name == NULL) 422 goto out_err; 423 } 424 if (orig->group_name) { 425 evsel->group_name = strdup(orig->group_name); 426 if (evsel->group_name == NULL) 427 goto out_err; 428 } 429 if (orig->pmu_name) { 430 evsel->pmu_name = strdup(orig->pmu_name); 431 if (evsel->pmu_name == NULL) 432 goto out_err; 433 } 434 if (orig->filter) { 435 evsel->filter = strdup(orig->filter); 436 if (evsel->filter == NULL) 437 goto out_err; 438 } 439 if (orig->metric_id) { 440 evsel->metric_id = strdup(orig->metric_id); 441 if (evsel->metric_id == NULL) 442 goto out_err; 443 } 444 evsel->cgrp = cgroup__get(orig->cgrp); 445 evsel->tp_format = orig->tp_format; 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; 470 471 if (evsel__copy_config_terms(evsel, orig) < 0) 472 goto out_err; 473 474 return evsel; 475 476 out_err: 477 evsel__delete(evsel); 478 return NULL; 479 } 480 481 /* 482 * Returns pointer with encoded error via <linux/err.h> interface. 483 */ 484 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx) 485 { 486 struct evsel *evsel = zalloc(perf_evsel__object.size); 487 int err = -ENOMEM; 488 489 if (evsel == NULL) { 490 goto out_err; 491 } else { 492 struct perf_event_attr attr = { 493 .type = PERF_TYPE_TRACEPOINT, 494 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 495 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 496 }; 497 498 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 499 goto out_free; 500 501 evsel->tp_format = trace_event__tp_format(sys, name); 502 if (IS_ERR(evsel->tp_format)) { 503 err = PTR_ERR(evsel->tp_format); 504 goto out_free; 505 } 506 507 event_attr_init(&attr); 508 attr.config = evsel->tp_format->id; 509 attr.sample_period = 1; 510 evsel__init(evsel, &attr, idx); 511 } 512 513 return evsel; 514 515 out_free: 516 zfree(&evsel->name); 517 free(evsel); 518 out_err: 519 return ERR_PTR(err); 520 } 521 522 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = { 523 "cycles", 524 "instructions", 525 "cache-references", 526 "cache-misses", 527 "branches", 528 "branch-misses", 529 "bus-cycles", 530 "stalled-cycles-frontend", 531 "stalled-cycles-backend", 532 "ref-cycles", 533 }; 534 535 char *evsel__bpf_counter_events; 536 537 bool evsel__match_bpf_counter_events(const char *name) 538 { 539 int name_len; 540 bool match; 541 char *ptr; 542 543 if (!evsel__bpf_counter_events) 544 return false; 545 546 ptr = strstr(evsel__bpf_counter_events, name); 547 name_len = strlen(name); 548 549 /* check name matches a full token in evsel__bpf_counter_events */ 550 match = (ptr != NULL) && 551 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && 552 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); 553 554 return match; 555 } 556 557 static const char *__evsel__hw_name(u64 config) 558 { 559 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 560 return evsel__hw_names[config]; 561 562 return "unknown-hardware"; 563 } 564 565 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 566 { 567 int colon = 0, r = 0; 568 struct perf_event_attr *attr = &evsel->core.attr; 569 bool exclude_guest_default = false; 570 571 #define MOD_PRINT(context, mod) do { \ 572 if (!attr->exclude_##context) { \ 573 if (!colon) colon = ++r; \ 574 r += scnprintf(bf + r, size - r, "%c", mod); \ 575 } } while(0) 576 577 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 578 MOD_PRINT(kernel, 'k'); 579 MOD_PRINT(user, 'u'); 580 MOD_PRINT(hv, 'h'); 581 exclude_guest_default = true; 582 } 583 584 if (attr->precise_ip) { 585 if (!colon) 586 colon = ++r; 587 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 588 exclude_guest_default = true; 589 } 590 591 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 592 MOD_PRINT(host, 'H'); 593 MOD_PRINT(guest, 'G'); 594 } 595 #undef MOD_PRINT 596 if (colon) 597 bf[colon - 1] = ':'; 598 return r; 599 } 600 601 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 602 { 603 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 604 } 605 606 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 607 { 608 int r = arch_evsel__hw_name(evsel, bf, size); 609 return r + evsel__add_modifiers(evsel, bf + r, size - r); 610 } 611 612 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = { 613 "cpu-clock", 614 "task-clock", 615 "page-faults", 616 "context-switches", 617 "cpu-migrations", 618 "minor-faults", 619 "major-faults", 620 "alignment-faults", 621 "emulation-faults", 622 "dummy", 623 }; 624 625 static const char *__evsel__sw_name(u64 config) 626 { 627 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 628 return evsel__sw_names[config]; 629 return "unknown-software"; 630 } 631 632 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 633 { 634 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 635 return r + evsel__add_modifiers(evsel, bf + r, size - r); 636 } 637 638 static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size) 639 { 640 return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev)); 641 } 642 643 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 644 { 645 int r; 646 647 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 648 649 if (type & HW_BREAKPOINT_R) 650 r += scnprintf(bf + r, size - r, "r"); 651 652 if (type & HW_BREAKPOINT_W) 653 r += scnprintf(bf + r, size - r, "w"); 654 655 if (type & HW_BREAKPOINT_X) 656 r += scnprintf(bf + r, size - r, "x"); 657 658 return r; 659 } 660 661 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 662 { 663 struct perf_event_attr *attr = &evsel->core.attr; 664 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 665 return r + evsel__add_modifiers(evsel, bf + r, size - r); 666 } 667 668 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 669 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 670 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 671 { "LLC", "L2", }, 672 { "dTLB", "d-tlb", "Data-TLB", }, 673 { "iTLB", "i-tlb", "Instruction-TLB", }, 674 { "branch", "branches", "bpu", "btb", "bpc", }, 675 { "node", }, 676 }; 677 678 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 679 { "load", "loads", "read", }, 680 { "store", "stores", "write", }, 681 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 682 }; 683 684 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 685 { "refs", "Reference", "ops", "access", }, 686 { "misses", "miss", }, 687 }; 688 689 #define C(x) PERF_COUNT_HW_CACHE_##x 690 #define CACHE_READ (1 << C(OP_READ)) 691 #define CACHE_WRITE (1 << C(OP_WRITE)) 692 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 693 #define COP(x) (1 << x) 694 695 /* 696 * cache operation stat 697 * L1I : Read and prefetch only 698 * ITLB and BPU : Read-only 699 */ 700 static const unsigned long evsel__hw_cache_stat[C(MAX)] = { 701 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 702 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 703 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 704 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 705 [C(ITLB)] = (CACHE_READ), 706 [C(BPU)] = (CACHE_READ), 707 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 708 }; 709 710 bool evsel__is_cache_op_valid(u8 type, u8 op) 711 { 712 if (evsel__hw_cache_stat[type] & COP(op)) 713 return true; /* valid */ 714 else 715 return false; /* invalid */ 716 } 717 718 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 719 { 720 if (result) { 721 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 722 evsel__hw_cache_op[op][0], 723 evsel__hw_cache_result[result][0]); 724 } 725 726 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 727 evsel__hw_cache_op[op][1]); 728 } 729 730 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 731 { 732 u8 op, result, type = (config >> 0) & 0xff; 733 const char *err = "unknown-ext-hardware-cache-type"; 734 735 if (type >= PERF_COUNT_HW_CACHE_MAX) 736 goto out_err; 737 738 op = (config >> 8) & 0xff; 739 err = "unknown-ext-hardware-cache-op"; 740 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 741 goto out_err; 742 743 result = (config >> 16) & 0xff; 744 err = "unknown-ext-hardware-cache-result"; 745 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 746 goto out_err; 747 748 err = "invalid-cache"; 749 if (!evsel__is_cache_op_valid(type, op)) 750 goto out_err; 751 752 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 753 out_err: 754 return scnprintf(bf, size, "%s", err); 755 } 756 757 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 758 { 759 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 760 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 761 } 762 763 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 764 { 765 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 766 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 767 } 768 769 const char *evsel__name(struct evsel *evsel) 770 { 771 char bf[128]; 772 773 if (!evsel) 774 goto out_unknown; 775 776 if (evsel->name) 777 return evsel->name; 778 779 switch (evsel->core.attr.type) { 780 case PERF_TYPE_RAW: 781 evsel__raw_name(evsel, bf, sizeof(bf)); 782 break; 783 784 case PERF_TYPE_HARDWARE: 785 evsel__hw_name(evsel, bf, sizeof(bf)); 786 break; 787 788 case PERF_TYPE_HW_CACHE: 789 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 790 break; 791 792 case PERF_TYPE_SOFTWARE: 793 if (evsel__is_tool(evsel)) 794 evsel__tool_name(evsel->tool_event, bf, sizeof(bf)); 795 else 796 evsel__sw_name(evsel, bf, sizeof(bf)); 797 break; 798 799 case PERF_TYPE_TRACEPOINT: 800 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 801 break; 802 803 case PERF_TYPE_BREAKPOINT: 804 evsel__bp_name(evsel, bf, sizeof(bf)); 805 break; 806 807 default: 808 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 809 evsel->core.attr.type); 810 break; 811 } 812 813 evsel->name = strdup(bf); 814 815 if (evsel->name) 816 return evsel->name; 817 out_unknown: 818 return "unknown"; 819 } 820 821 const char *evsel__metric_id(const struct evsel *evsel) 822 { 823 if (evsel->metric_id) 824 return evsel->metric_id; 825 826 if (evsel__is_tool(evsel)) 827 return perf_tool_event__to_str(evsel->tool_event); 828 829 return "unknown"; 830 } 831 832 const char *evsel__group_name(struct evsel *evsel) 833 { 834 return evsel->group_name ?: "anon group"; 835 } 836 837 /* 838 * Returns the group details for the specified leader, 839 * with following rules. 840 * 841 * For record -e '{cycles,instructions}' 842 * 'anon group { cycles:u, instructions:u }' 843 * 844 * For record -e 'cycles,instructions' and report --group 845 * 'cycles:u, instructions:u' 846 */ 847 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 848 { 849 int ret = 0; 850 struct evsel *pos; 851 const char *group_name = evsel__group_name(evsel); 852 853 if (!evsel->forced_leader) 854 ret = scnprintf(buf, size, "%s { ", group_name); 855 856 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel)); 857 858 for_each_group_member(pos, evsel) 859 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos)); 860 861 if (!evsel->forced_leader) 862 ret += scnprintf(buf + ret, size - ret, " }"); 863 864 return ret; 865 } 866 867 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 868 struct callchain_param *param) 869 { 870 bool function = evsel__is_function_event(evsel); 871 struct perf_event_attr *attr = &evsel->core.attr; 872 873 evsel__set_sample_bit(evsel, CALLCHAIN); 874 875 attr->sample_max_stack = param->max_stack; 876 877 if (opts->kernel_callchains) 878 attr->exclude_callchain_user = 1; 879 if (opts->user_callchains) 880 attr->exclude_callchain_kernel = 1; 881 if (param->record_mode == CALLCHAIN_LBR) { 882 if (!opts->branch_stack) { 883 if (attr->exclude_user) { 884 pr_warning("LBR callstack option is only available " 885 "to get user callchain information. " 886 "Falling back to framepointers.\n"); 887 } else { 888 evsel__set_sample_bit(evsel, BRANCH_STACK); 889 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 890 PERF_SAMPLE_BRANCH_CALL_STACK | 891 PERF_SAMPLE_BRANCH_NO_CYCLES | 892 PERF_SAMPLE_BRANCH_NO_FLAGS | 893 PERF_SAMPLE_BRANCH_HW_INDEX; 894 } 895 } else 896 pr_warning("Cannot use LBR callstack with branch stack. " 897 "Falling back to framepointers.\n"); 898 } 899 900 if (param->record_mode == CALLCHAIN_DWARF) { 901 if (!function) { 902 evsel__set_sample_bit(evsel, REGS_USER); 903 evsel__set_sample_bit(evsel, STACK_USER); 904 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) { 905 attr->sample_regs_user |= DWARF_MINIMAL_REGS; 906 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 907 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 908 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 909 } else { 910 attr->sample_regs_user |= arch__user_reg_mask(); 911 } 912 attr->sample_stack_user = param->dump_size; 913 attr->exclude_callchain_user = 1; 914 } else { 915 pr_info("Cannot use DWARF unwind for function trace event," 916 " falling back to framepointers.\n"); 917 } 918 } 919 920 if (function) { 921 pr_info("Disabling user space callchains for function trace event.\n"); 922 attr->exclude_callchain_user = 1; 923 } 924 } 925 926 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 927 struct callchain_param *param) 928 { 929 if (param->enabled) 930 return __evsel__config_callchain(evsel, opts, param); 931 } 932 933 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param) 934 { 935 struct perf_event_attr *attr = &evsel->core.attr; 936 937 evsel__reset_sample_bit(evsel, CALLCHAIN); 938 if (param->record_mode == CALLCHAIN_LBR) { 939 evsel__reset_sample_bit(evsel, BRANCH_STACK); 940 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 941 PERF_SAMPLE_BRANCH_CALL_STACK | 942 PERF_SAMPLE_BRANCH_HW_INDEX); 943 } 944 if (param->record_mode == CALLCHAIN_DWARF) { 945 evsel__reset_sample_bit(evsel, REGS_USER); 946 evsel__reset_sample_bit(evsel, STACK_USER); 947 } 948 } 949 950 static void evsel__apply_config_terms(struct evsel *evsel, 951 struct record_opts *opts, bool track) 952 { 953 struct evsel_config_term *term; 954 struct list_head *config_terms = &evsel->config_terms; 955 struct perf_event_attr *attr = &evsel->core.attr; 956 /* callgraph default */ 957 struct callchain_param param = { 958 .record_mode = callchain_param.record_mode, 959 }; 960 u32 dump_size = 0; 961 int max_stack = 0; 962 const char *callgraph_buf = NULL; 963 964 list_for_each_entry(term, config_terms, list) { 965 switch (term->type) { 966 case EVSEL__CONFIG_TERM_PERIOD: 967 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 968 attr->sample_period = term->val.period; 969 attr->freq = 0; 970 evsel__reset_sample_bit(evsel, PERIOD); 971 } 972 break; 973 case EVSEL__CONFIG_TERM_FREQ: 974 if (!(term->weak && opts->user_freq != UINT_MAX)) { 975 attr->sample_freq = term->val.freq; 976 attr->freq = 1; 977 evsel__set_sample_bit(evsel, PERIOD); 978 } 979 break; 980 case EVSEL__CONFIG_TERM_TIME: 981 if (term->val.time) 982 evsel__set_sample_bit(evsel, TIME); 983 else 984 evsel__reset_sample_bit(evsel, TIME); 985 break; 986 case EVSEL__CONFIG_TERM_CALLGRAPH: 987 callgraph_buf = term->val.str; 988 break; 989 case EVSEL__CONFIG_TERM_BRANCH: 990 if (term->val.str && strcmp(term->val.str, "no")) { 991 evsel__set_sample_bit(evsel, BRANCH_STACK); 992 parse_branch_str(term->val.str, 993 &attr->branch_sample_type); 994 } else 995 evsel__reset_sample_bit(evsel, BRANCH_STACK); 996 break; 997 case EVSEL__CONFIG_TERM_STACK_USER: 998 dump_size = term->val.stack_user; 999 break; 1000 case EVSEL__CONFIG_TERM_MAX_STACK: 1001 max_stack = term->val.max_stack; 1002 break; 1003 case EVSEL__CONFIG_TERM_MAX_EVENTS: 1004 evsel->max_events = term->val.max_events; 1005 break; 1006 case EVSEL__CONFIG_TERM_INHERIT: 1007 /* 1008 * attr->inherit should has already been set by 1009 * evsel__config. If user explicitly set 1010 * inherit using config terms, override global 1011 * opt->no_inherit setting. 1012 */ 1013 attr->inherit = term->val.inherit ? 1 : 0; 1014 break; 1015 case EVSEL__CONFIG_TERM_OVERWRITE: 1016 attr->write_backward = term->val.overwrite ? 1 : 0; 1017 break; 1018 case EVSEL__CONFIG_TERM_DRV_CFG: 1019 break; 1020 case EVSEL__CONFIG_TERM_PERCORE: 1021 break; 1022 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 1023 attr->aux_output = term->val.aux_output ? 1 : 0; 1024 break; 1025 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 1026 /* Already applied by auxtrace */ 1027 break; 1028 case EVSEL__CONFIG_TERM_CFG_CHG: 1029 break; 1030 default: 1031 break; 1032 } 1033 } 1034 1035 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 1036 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 1037 bool sample_address = false; 1038 1039 if (max_stack) { 1040 param.max_stack = max_stack; 1041 if (callgraph_buf == NULL) 1042 callgraph_buf = "fp"; 1043 } 1044 1045 /* parse callgraph parameters */ 1046 if (callgraph_buf != NULL) { 1047 if (!strcmp(callgraph_buf, "no")) { 1048 param.enabled = false; 1049 param.record_mode = CALLCHAIN_NONE; 1050 } else { 1051 param.enabled = true; 1052 if (parse_callchain_record(callgraph_buf, ¶m)) { 1053 pr_err("per-event callgraph setting for %s failed. " 1054 "Apply callgraph global setting for it\n", 1055 evsel->name); 1056 return; 1057 } 1058 if (param.record_mode == CALLCHAIN_DWARF) 1059 sample_address = true; 1060 } 1061 } 1062 if (dump_size > 0) { 1063 dump_size = round_up(dump_size, sizeof(u64)); 1064 param.dump_size = dump_size; 1065 } 1066 1067 /* If global callgraph set, clear it */ 1068 if (callchain_param.enabled) 1069 evsel__reset_callgraph(evsel, &callchain_param); 1070 1071 /* set perf-event callgraph */ 1072 if (param.enabled) { 1073 if (sample_address) { 1074 evsel__set_sample_bit(evsel, ADDR); 1075 evsel__set_sample_bit(evsel, DATA_SRC); 1076 evsel->core.attr.mmap_data = track; 1077 } 1078 evsel__config_callchain(evsel, opts, ¶m); 1079 } 1080 } 1081 } 1082 1083 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 1084 { 1085 struct evsel_config_term *term, *found_term = NULL; 1086 1087 list_for_each_entry(term, &evsel->config_terms, list) { 1088 if (term->type == type) 1089 found_term = term; 1090 } 1091 1092 return found_term; 1093 } 1094 1095 void __weak arch_evsel__set_sample_weight(struct evsel *evsel) 1096 { 1097 evsel__set_sample_bit(evsel, WEIGHT); 1098 } 1099 1100 void __weak arch_evsel__fixup_new_cycles(struct perf_event_attr *attr __maybe_unused) 1101 { 1102 } 1103 1104 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, 1105 struct perf_event_attr *attr __maybe_unused) 1106 { 1107 } 1108 1109 static void evsel__set_default_freq_period(struct record_opts *opts, 1110 struct perf_event_attr *attr) 1111 { 1112 if (opts->freq) { 1113 attr->freq = 1; 1114 attr->sample_freq = opts->freq; 1115 } else { 1116 attr->sample_period = opts->default_interval; 1117 } 1118 } 1119 1120 static bool evsel__is_offcpu_event(struct evsel *evsel) 1121 { 1122 return evsel__is_bpf_output(evsel) && !strcmp(evsel->name, OFFCPU_EVENT); 1123 } 1124 1125 /* 1126 * The enable_on_exec/disabled value strategy: 1127 * 1128 * 1) For any type of traced program: 1129 * - all independent events and group leaders are disabled 1130 * - all group members are enabled 1131 * 1132 * Group members are ruled by group leaders. They need to 1133 * be enabled, because the group scheduling relies on that. 1134 * 1135 * 2) For traced programs executed by perf: 1136 * - all independent events and group leaders have 1137 * enable_on_exec set 1138 * - we don't specifically enable or disable any event during 1139 * the record command 1140 * 1141 * Independent events and group leaders are initially disabled 1142 * and get enabled by exec. Group members are ruled by group 1143 * leaders as stated in 1). 1144 * 1145 * 3) For traced programs attached by perf (pid/tid): 1146 * - we specifically enable or disable all events during 1147 * the record command 1148 * 1149 * When attaching events to already running traced we 1150 * enable/disable events specifically, as there's no 1151 * initial traced exec call. 1152 */ 1153 void evsel__config(struct evsel *evsel, struct record_opts *opts, 1154 struct callchain_param *callchain) 1155 { 1156 struct evsel *leader = evsel__leader(evsel); 1157 struct perf_event_attr *attr = &evsel->core.attr; 1158 int track = evsel->tracking; 1159 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 1160 1161 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 1162 attr->inherit = !opts->no_inherit; 1163 attr->write_backward = opts->overwrite ? 1 : 0; 1164 attr->read_format = PERF_FORMAT_LOST; 1165 1166 evsel__set_sample_bit(evsel, IP); 1167 evsel__set_sample_bit(evsel, TID); 1168 1169 if (evsel->sample_read) { 1170 evsel__set_sample_bit(evsel, READ); 1171 1172 /* 1173 * We need ID even in case of single event, because 1174 * PERF_SAMPLE_READ process ID specific data. 1175 */ 1176 evsel__set_sample_id(evsel, false); 1177 1178 /* 1179 * Apply group format only if we belong to group 1180 * with more than one members. 1181 */ 1182 if (leader->core.nr_members > 1) { 1183 attr->read_format |= PERF_FORMAT_GROUP; 1184 attr->inherit = 0; 1185 } 1186 } 1187 1188 /* 1189 * We default some events to have a default interval. But keep 1190 * it a weak assumption overridable by the user. 1191 */ 1192 if ((evsel->is_libpfm_event && !attr->sample_period) || 1193 (!evsel->is_libpfm_event && (!attr->sample_period || 1194 opts->user_freq != UINT_MAX || 1195 opts->user_interval != ULLONG_MAX))) 1196 evsel__set_default_freq_period(opts, attr); 1197 1198 /* 1199 * If attr->freq was set (here or earlier), ask for period 1200 * to be sampled. 1201 */ 1202 if (attr->freq) 1203 evsel__set_sample_bit(evsel, PERIOD); 1204 1205 if (opts->no_samples) 1206 attr->sample_freq = 0; 1207 1208 if (opts->inherit_stat) { 1209 evsel->core.attr.read_format |= 1210 PERF_FORMAT_TOTAL_TIME_ENABLED | 1211 PERF_FORMAT_TOTAL_TIME_RUNNING | 1212 PERF_FORMAT_ID; 1213 attr->inherit_stat = 1; 1214 } 1215 1216 if (opts->sample_address) { 1217 evsel__set_sample_bit(evsel, ADDR); 1218 attr->mmap_data = track; 1219 } 1220 1221 /* 1222 * We don't allow user space callchains for function trace 1223 * event, due to issues with page faults while tracing page 1224 * fault handler and its overall trickiness nature. 1225 */ 1226 if (evsel__is_function_event(evsel)) 1227 evsel->core.attr.exclude_callchain_user = 1; 1228 1229 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1230 evsel__config_callchain(evsel, opts, callchain); 1231 1232 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1233 !evsel__is_dummy_event(evsel)) { 1234 attr->sample_regs_intr = opts->sample_intr_regs; 1235 evsel__set_sample_bit(evsel, REGS_INTR); 1236 } 1237 1238 if (opts->sample_user_regs && !evsel->no_aux_samples && 1239 !evsel__is_dummy_event(evsel)) { 1240 attr->sample_regs_user |= opts->sample_user_regs; 1241 evsel__set_sample_bit(evsel, REGS_USER); 1242 } 1243 1244 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1245 evsel__set_sample_bit(evsel, CPU); 1246 1247 /* 1248 * When the user explicitly disabled time don't force it here. 1249 */ 1250 if (opts->sample_time && 1251 (!perf_missing_features.sample_id_all && 1252 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1253 opts->sample_time_set))) 1254 evsel__set_sample_bit(evsel, TIME); 1255 1256 if (opts->raw_samples && !evsel->no_aux_samples) { 1257 evsel__set_sample_bit(evsel, TIME); 1258 evsel__set_sample_bit(evsel, RAW); 1259 evsel__set_sample_bit(evsel, CPU); 1260 } 1261 1262 if (opts->sample_address) 1263 evsel__set_sample_bit(evsel, DATA_SRC); 1264 1265 if (opts->sample_phys_addr) 1266 evsel__set_sample_bit(evsel, PHYS_ADDR); 1267 1268 if (opts->no_buffering) { 1269 attr->watermark = 0; 1270 attr->wakeup_events = 1; 1271 } 1272 if (opts->branch_stack && !evsel->no_aux_samples) { 1273 evsel__set_sample_bit(evsel, BRANCH_STACK); 1274 attr->branch_sample_type = opts->branch_stack; 1275 } 1276 1277 if (opts->sample_weight) 1278 arch_evsel__set_sample_weight(evsel); 1279 1280 attr->task = track; 1281 attr->mmap = track; 1282 attr->mmap2 = track && !perf_missing_features.mmap2; 1283 attr->comm = track; 1284 attr->build_id = track && opts->build_id; 1285 1286 /* 1287 * ksymbol is tracked separately with text poke because it needs to be 1288 * system wide and enabled immediately. 1289 */ 1290 if (!opts->text_poke) 1291 attr->ksymbol = track && !perf_missing_features.ksymbol; 1292 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1293 1294 if (opts->record_namespaces) 1295 attr->namespaces = track; 1296 1297 if (opts->record_cgroup) { 1298 attr->cgroup = track && !perf_missing_features.cgroup; 1299 evsel__set_sample_bit(evsel, CGROUP); 1300 } 1301 1302 if (opts->sample_data_page_size) 1303 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); 1304 1305 if (opts->sample_code_page_size) 1306 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); 1307 1308 if (opts->record_switch_events) 1309 attr->context_switch = track; 1310 1311 if (opts->sample_transaction) 1312 evsel__set_sample_bit(evsel, TRANSACTION); 1313 1314 if (opts->running_time) { 1315 evsel->core.attr.read_format |= 1316 PERF_FORMAT_TOTAL_TIME_ENABLED | 1317 PERF_FORMAT_TOTAL_TIME_RUNNING; 1318 } 1319 1320 /* 1321 * XXX see the function comment above 1322 * 1323 * Disabling only independent events or group leaders, 1324 * keeping group members enabled. 1325 */ 1326 if (evsel__is_group_leader(evsel)) 1327 attr->disabled = 1; 1328 1329 /* 1330 * Setting enable_on_exec for independent events and 1331 * group leaders for traced executed by perf. 1332 */ 1333 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1334 !opts->initial_delay) 1335 attr->enable_on_exec = 1; 1336 1337 if (evsel->immediate) { 1338 attr->disabled = 0; 1339 attr->enable_on_exec = 0; 1340 } 1341 1342 clockid = opts->clockid; 1343 if (opts->use_clockid) { 1344 attr->use_clockid = 1; 1345 attr->clockid = opts->clockid; 1346 } 1347 1348 if (evsel->precise_max) 1349 attr->precise_ip = 3; 1350 1351 if (opts->all_user) { 1352 attr->exclude_kernel = 1; 1353 attr->exclude_user = 0; 1354 } 1355 1356 if (opts->all_kernel) { 1357 attr->exclude_kernel = 0; 1358 attr->exclude_user = 1; 1359 } 1360 1361 if (evsel->core.own_cpus || evsel->unit) 1362 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1363 1364 /* 1365 * Apply event specific term settings, 1366 * it overloads any global configuration. 1367 */ 1368 evsel__apply_config_terms(evsel, opts, track); 1369 1370 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1371 1372 /* The --period option takes the precedence. */ 1373 if (opts->period_set) { 1374 if (opts->period) 1375 evsel__set_sample_bit(evsel, PERIOD); 1376 else 1377 evsel__reset_sample_bit(evsel, PERIOD); 1378 } 1379 1380 /* 1381 * A dummy event never triggers any actual counter and therefore 1382 * cannot be used with branch_stack. 1383 * 1384 * For initial_delay, a dummy event is added implicitly. 1385 * The software event will trigger -EOPNOTSUPP error out, 1386 * if BRANCH_STACK bit is set. 1387 */ 1388 if (evsel__is_dummy_event(evsel)) 1389 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1390 1391 if (evsel__is_offcpu_event(evsel)) 1392 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; 1393 1394 arch__post_evsel_config(evsel, attr); 1395 } 1396 1397 int evsel__set_filter(struct evsel *evsel, const char *filter) 1398 { 1399 char *new_filter = strdup(filter); 1400 1401 if (new_filter != NULL) { 1402 free(evsel->filter); 1403 evsel->filter = new_filter; 1404 return 0; 1405 } 1406 1407 return -1; 1408 } 1409 1410 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1411 { 1412 char *new_filter; 1413 1414 if (evsel->filter == NULL) 1415 return evsel__set_filter(evsel, filter); 1416 1417 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1418 free(evsel->filter); 1419 evsel->filter = new_filter; 1420 return 0; 1421 } 1422 1423 return -1; 1424 } 1425 1426 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1427 { 1428 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1429 } 1430 1431 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1432 { 1433 return evsel__append_filter(evsel, "%s,%s", filter); 1434 } 1435 1436 /* Caller has to clear disabled after going through all CPUs. */ 1437 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx) 1438 { 1439 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); 1440 } 1441 1442 int evsel__enable(struct evsel *evsel) 1443 { 1444 int err = perf_evsel__enable(&evsel->core); 1445 1446 if (!err) 1447 evsel->disabled = false; 1448 return err; 1449 } 1450 1451 /* Caller has to set disabled after going through all CPUs. */ 1452 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx) 1453 { 1454 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); 1455 } 1456 1457 int evsel__disable(struct evsel *evsel) 1458 { 1459 int err = perf_evsel__disable(&evsel->core); 1460 /* 1461 * We mark it disabled here so that tools that disable a event can 1462 * ignore events after they disable it. I.e. the ring buffer may have 1463 * already a few more events queued up before the kernel got the stop 1464 * request. 1465 */ 1466 if (!err) 1467 evsel->disabled = true; 1468 1469 return err; 1470 } 1471 1472 void free_config_terms(struct list_head *config_terms) 1473 { 1474 struct evsel_config_term *term, *h; 1475 1476 list_for_each_entry_safe(term, h, config_terms, list) { 1477 list_del_init(&term->list); 1478 if (term->free_str) 1479 zfree(&term->val.str); 1480 free(term); 1481 } 1482 } 1483 1484 static void evsel__free_config_terms(struct evsel *evsel) 1485 { 1486 free_config_terms(&evsel->config_terms); 1487 } 1488 1489 void evsel__exit(struct evsel *evsel) 1490 { 1491 assert(list_empty(&evsel->core.node)); 1492 assert(evsel->evlist == NULL); 1493 bpf_counter__destroy(evsel); 1494 evsel__free_counts(evsel); 1495 perf_evsel__free_fd(&evsel->core); 1496 perf_evsel__free_id(&evsel->core); 1497 evsel__free_config_terms(evsel); 1498 cgroup__put(evsel->cgrp); 1499 perf_cpu_map__put(evsel->core.cpus); 1500 perf_cpu_map__put(evsel->core.own_cpus); 1501 perf_thread_map__put(evsel->core.threads); 1502 zfree(&evsel->group_name); 1503 zfree(&evsel->name); 1504 zfree(&evsel->pmu_name); 1505 zfree(&evsel->unit); 1506 zfree(&evsel->metric_id); 1507 evsel__zero_per_pkg(evsel); 1508 hashmap__free(evsel->per_pkg_mask); 1509 evsel->per_pkg_mask = NULL; 1510 zfree(&evsel->metric_events); 1511 perf_evsel__object.fini(evsel); 1512 } 1513 1514 void evsel__delete(struct evsel *evsel) 1515 { 1516 evsel__exit(evsel); 1517 free(evsel); 1518 } 1519 1520 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread, 1521 struct perf_counts_values *count) 1522 { 1523 struct perf_counts_values tmp; 1524 1525 if (!evsel->prev_raw_counts) 1526 return; 1527 1528 if (cpu_map_idx == -1) { 1529 tmp = evsel->prev_raw_counts->aggr; 1530 evsel->prev_raw_counts->aggr = *count; 1531 } else { 1532 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); 1533 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; 1534 } 1535 1536 count->val = count->val - tmp.val; 1537 count->ena = count->ena - tmp.ena; 1538 count->run = count->run - tmp.run; 1539 } 1540 1541 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) 1542 { 1543 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); 1544 1545 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); 1546 } 1547 1548 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, 1549 u64 val, u64 ena, u64 run, u64 lost) 1550 { 1551 struct perf_counts_values *count; 1552 1553 count = perf_counts(counter->counts, cpu_map_idx, thread); 1554 1555 count->val = val; 1556 count->ena = ena; 1557 count->run = run; 1558 count->lost = lost; 1559 1560 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1561 } 1562 1563 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) 1564 { 1565 u64 read_format = leader->core.attr.read_format; 1566 struct sample_read_value *v; 1567 u64 nr, ena = 0, run = 0, lost = 0; 1568 1569 nr = *data++; 1570 1571 if (nr != (u64) leader->core.nr_members) 1572 return -EINVAL; 1573 1574 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1575 ena = *data++; 1576 1577 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1578 run = *data++; 1579 1580 v = (void *)data; 1581 sample_read_group__for_each(v, nr, read_format) { 1582 struct evsel *counter; 1583 1584 counter = evlist__id2evsel(leader->evlist, v->id); 1585 if (!counter) 1586 return -EINVAL; 1587 1588 if (read_format & PERF_FORMAT_LOST) 1589 lost = v->lost; 1590 1591 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); 1592 } 1593 1594 return 0; 1595 } 1596 1597 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread) 1598 { 1599 struct perf_stat_evsel *ps = leader->stats; 1600 u64 read_format = leader->core.attr.read_format; 1601 int size = perf_evsel__read_size(&leader->core); 1602 u64 *data = ps->group_data; 1603 1604 if (!(read_format & PERF_FORMAT_ID)) 1605 return -EINVAL; 1606 1607 if (!evsel__is_group_leader(leader)) 1608 return -EINVAL; 1609 1610 if (!data) { 1611 data = zalloc(size); 1612 if (!data) 1613 return -ENOMEM; 1614 1615 ps->group_data = data; 1616 } 1617 1618 if (FD(leader, cpu_map_idx, thread) < 0) 1619 return -EINVAL; 1620 1621 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) 1622 return -errno; 1623 1624 return evsel__process_group_data(leader, cpu_map_idx, thread, data); 1625 } 1626 1627 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) 1628 { 1629 u64 read_format = evsel->core.attr.read_format; 1630 1631 if (read_format & PERF_FORMAT_GROUP) 1632 return evsel__read_group(evsel, cpu_map_idx, thread); 1633 1634 return evsel__read_one(evsel, cpu_map_idx, thread); 1635 } 1636 1637 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) 1638 { 1639 struct perf_counts_values count; 1640 size_t nv = scale ? 3 : 1; 1641 1642 if (FD(evsel, cpu_map_idx, thread) < 0) 1643 return -EINVAL; 1644 1645 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) 1646 return -ENOMEM; 1647 1648 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) 1649 return -errno; 1650 1651 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); 1652 perf_counts_values__scale(&count, scale, NULL); 1653 *perf_counts(evsel->counts, cpu_map_idx, thread) = count; 1654 return 0; 1655 } 1656 1657 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, 1658 int cpu_map_idx) 1659 { 1660 struct perf_cpu cpu; 1661 1662 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); 1663 return perf_cpu_map__idx(other->core.cpus, cpu); 1664 } 1665 1666 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) 1667 { 1668 struct evsel *leader = evsel__leader(evsel); 1669 1670 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || 1671 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { 1672 return evsel__match_other_cpu(evsel, leader, cpu_map_idx); 1673 } 1674 1675 return cpu_map_idx; 1676 } 1677 1678 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) 1679 { 1680 struct evsel *leader = evsel__leader(evsel); 1681 int fd; 1682 1683 if (evsel__is_group_leader(evsel)) 1684 return -1; 1685 1686 /* 1687 * Leader must be already processed/open, 1688 * if not it's a bug. 1689 */ 1690 BUG_ON(!leader->core.fd); 1691 1692 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); 1693 if (cpu_map_idx == -1) 1694 return -1; 1695 1696 fd = FD(leader, cpu_map_idx, thread); 1697 BUG_ON(fd == -1); 1698 1699 return fd; 1700 } 1701 1702 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx) 1703 { 1704 for (int cpu = 0; cpu < nr_cpus; cpu++) 1705 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1706 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1707 } 1708 1709 static int update_fds(struct evsel *evsel, 1710 int nr_cpus, int cpu_map_idx, 1711 int nr_threads, int thread_idx) 1712 { 1713 struct evsel *pos; 1714 1715 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) 1716 return -EINVAL; 1717 1718 evlist__for_each_entry(evsel->evlist, pos) { 1719 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; 1720 1721 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1722 1723 /* 1724 * Since fds for next evsel has not been created, 1725 * there is no need to iterate whole event list. 1726 */ 1727 if (pos == evsel) 1728 break; 1729 } 1730 return 0; 1731 } 1732 1733 static bool evsel__ignore_missing_thread(struct evsel *evsel, 1734 int nr_cpus, int cpu_map_idx, 1735 struct perf_thread_map *threads, 1736 int thread, int err) 1737 { 1738 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1739 1740 if (!evsel->ignore_missing_thread) 1741 return false; 1742 1743 /* The system wide setup does not work with threads. */ 1744 if (evsel->core.system_wide) 1745 return false; 1746 1747 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1748 if (err != -ESRCH) 1749 return false; 1750 1751 /* If there's only one thread, let it fail. */ 1752 if (threads->nr == 1) 1753 return false; 1754 1755 /* 1756 * We should remove fd for missing_thread first 1757 * because thread_map__remove() will decrease threads->nr. 1758 */ 1759 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread)) 1760 return false; 1761 1762 if (thread_map__remove(threads, thread)) 1763 return false; 1764 1765 pr_warning("WARNING: Ignored open failure for pid %d\n", 1766 ignore_pid); 1767 return true; 1768 } 1769 1770 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1771 void *priv __maybe_unused) 1772 { 1773 return fprintf(fp, " %-32s %s\n", name, val); 1774 } 1775 1776 static void display_attr(struct perf_event_attr *attr) 1777 { 1778 if (verbose >= 2 || debug_peo_args) { 1779 fprintf(stderr, "%.60s\n", graph_dotted_line); 1780 fprintf(stderr, "perf_event_attr:\n"); 1781 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 1782 fprintf(stderr, "%.60s\n", graph_dotted_line); 1783 } 1784 } 1785 1786 bool evsel__precise_ip_fallback(struct evsel *evsel) 1787 { 1788 /* Do not try less precise if not requested. */ 1789 if (!evsel->precise_max) 1790 return false; 1791 1792 /* 1793 * We tried all the precise_ip values, and it's 1794 * still failing, so leave it to standard fallback. 1795 */ 1796 if (!evsel->core.attr.precise_ip) { 1797 evsel->core.attr.precise_ip = evsel->precise_ip_original; 1798 return false; 1799 } 1800 1801 if (!evsel->precise_ip_original) 1802 evsel->precise_ip_original = evsel->core.attr.precise_ip; 1803 1804 evsel->core.attr.precise_ip--; 1805 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 1806 display_attr(&evsel->core.attr); 1807 return true; 1808 } 1809 1810 static struct perf_cpu_map *empty_cpu_map; 1811 static struct perf_thread_map *empty_thread_map; 1812 1813 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 1814 struct perf_thread_map *threads) 1815 { 1816 int nthreads; 1817 1818 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 1819 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 1820 return -EINVAL; 1821 1822 if (cpus == NULL) { 1823 if (empty_cpu_map == NULL) { 1824 empty_cpu_map = perf_cpu_map__dummy_new(); 1825 if (empty_cpu_map == NULL) 1826 return -ENOMEM; 1827 } 1828 1829 cpus = empty_cpu_map; 1830 } 1831 1832 if (threads == NULL) { 1833 if (empty_thread_map == NULL) { 1834 empty_thread_map = thread_map__new_by_tid(-1); 1835 if (empty_thread_map == NULL) 1836 return -ENOMEM; 1837 } 1838 1839 threads = empty_thread_map; 1840 } 1841 1842 if (evsel->core.system_wide) 1843 nthreads = 1; 1844 else 1845 nthreads = threads->nr; 1846 1847 if (evsel->core.fd == NULL && 1848 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) 1849 return -ENOMEM; 1850 1851 evsel->open_flags = PERF_FLAG_FD_CLOEXEC; 1852 if (evsel->cgrp) 1853 evsel->open_flags |= PERF_FLAG_PID_CGROUP; 1854 1855 return 0; 1856 } 1857 1858 static void evsel__disable_missing_features(struct evsel *evsel) 1859 { 1860 if (perf_missing_features.read_lost) 1861 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST; 1862 if (perf_missing_features.weight_struct) { 1863 evsel__set_sample_bit(evsel, WEIGHT); 1864 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT); 1865 } 1866 if (perf_missing_features.clockid_wrong) 1867 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1868 if (perf_missing_features.clockid) { 1869 evsel->core.attr.use_clockid = 0; 1870 evsel->core.attr.clockid = 0; 1871 } 1872 if (perf_missing_features.cloexec) 1873 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1874 if (perf_missing_features.mmap2) 1875 evsel->core.attr.mmap2 = 0; 1876 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest) 1877 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 1878 if (perf_missing_features.lbr_flags) 1879 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 1880 PERF_SAMPLE_BRANCH_NO_CYCLES); 1881 if (perf_missing_features.group_read && evsel->core.attr.inherit) 1882 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 1883 if (perf_missing_features.ksymbol) 1884 evsel->core.attr.ksymbol = 0; 1885 if (perf_missing_features.bpf) 1886 evsel->core.attr.bpf_event = 0; 1887 if (perf_missing_features.branch_hw_idx) 1888 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX; 1889 if (perf_missing_features.sample_id_all) 1890 evsel->core.attr.sample_id_all = 0; 1891 } 1892 1893 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 1894 struct perf_thread_map *threads) 1895 { 1896 int err; 1897 1898 err = __evsel__prepare_open(evsel, cpus, threads); 1899 if (err) 1900 return err; 1901 1902 evsel__disable_missing_features(evsel); 1903 1904 return err; 1905 } 1906 1907 bool evsel__detect_missing_features(struct evsel *evsel) 1908 { 1909 /* 1910 * Must probe features in the order they were added to the 1911 * perf_event_attr interface. 1912 */ 1913 if (!perf_missing_features.read_lost && 1914 (evsel->core.attr.read_format & PERF_FORMAT_LOST)) { 1915 perf_missing_features.read_lost = true; 1916 pr_debug2("switching off PERF_FORMAT_LOST support\n"); 1917 return true; 1918 } else if (!perf_missing_features.weight_struct && 1919 (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { 1920 perf_missing_features.weight_struct = true; 1921 pr_debug2("switching off weight struct support\n"); 1922 return true; 1923 } else if (!perf_missing_features.code_page_size && 1924 (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { 1925 perf_missing_features.code_page_size = true; 1926 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); 1927 return false; 1928 } else if (!perf_missing_features.data_page_size && 1929 (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { 1930 perf_missing_features.data_page_size = true; 1931 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); 1932 return false; 1933 } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { 1934 perf_missing_features.cgroup = true; 1935 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); 1936 return false; 1937 } else if (!perf_missing_features.branch_hw_idx && 1938 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { 1939 perf_missing_features.branch_hw_idx = true; 1940 pr_debug2("switching off branch HW index support\n"); 1941 return true; 1942 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 1943 perf_missing_features.aux_output = true; 1944 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); 1945 return false; 1946 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 1947 perf_missing_features.bpf = true; 1948 pr_debug2_peo("switching off bpf_event\n"); 1949 return true; 1950 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 1951 perf_missing_features.ksymbol = true; 1952 pr_debug2_peo("switching off ksymbol\n"); 1953 return true; 1954 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 1955 perf_missing_features.write_backward = true; 1956 pr_debug2_peo("switching off write_backward\n"); 1957 return false; 1958 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 1959 perf_missing_features.clockid_wrong = true; 1960 pr_debug2_peo("switching off clockid\n"); 1961 return true; 1962 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 1963 perf_missing_features.clockid = true; 1964 pr_debug2_peo("switching off use_clockid\n"); 1965 return true; 1966 } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { 1967 perf_missing_features.cloexec = true; 1968 pr_debug2_peo("switching off cloexec flag\n"); 1969 return true; 1970 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 1971 perf_missing_features.mmap2 = true; 1972 pr_debug2_peo("switching off mmap2\n"); 1973 return true; 1974 } else if ((evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) && 1975 (evsel->pmu == NULL || evsel->pmu->missing_features.exclude_guest)) { 1976 if (evsel->pmu == NULL) { 1977 evsel->pmu = evsel__find_pmu(evsel); 1978 if (evsel->pmu) 1979 evsel->pmu->missing_features.exclude_guest = true; 1980 else { 1981 /* we cannot find PMU, disable attrs now */ 1982 evsel->core.attr.exclude_host = false; 1983 evsel->core.attr.exclude_guest = false; 1984 } 1985 } 1986 1987 if (evsel->exclude_GH) { 1988 pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n"); 1989 return false; 1990 } 1991 if (!perf_missing_features.exclude_guest) { 1992 perf_missing_features.exclude_guest = true; 1993 pr_debug2_peo("switching off exclude_guest, exclude_host\n"); 1994 } 1995 return true; 1996 } else if (!perf_missing_features.sample_id_all) { 1997 perf_missing_features.sample_id_all = true; 1998 pr_debug2_peo("switching off sample_id_all\n"); 1999 return true; 2000 } else if (!perf_missing_features.lbr_flags && 2001 (evsel->core.attr.branch_sample_type & 2002 (PERF_SAMPLE_BRANCH_NO_CYCLES | 2003 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 2004 perf_missing_features.lbr_flags = true; 2005 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 2006 return true; 2007 } else if (!perf_missing_features.group_read && 2008 evsel->core.attr.inherit && 2009 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 2010 evsel__is_group_leader(evsel)) { 2011 perf_missing_features.group_read = true; 2012 pr_debug2_peo("switching off group read\n"); 2013 return true; 2014 } else { 2015 return false; 2016 } 2017 } 2018 2019 bool evsel__increase_rlimit(enum rlimit_action *set_rlimit) 2020 { 2021 int old_errno; 2022 struct rlimit l; 2023 2024 if (*set_rlimit < INCREASED_MAX) { 2025 old_errno = errno; 2026 2027 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 2028 if (*set_rlimit == NO_CHANGE) { 2029 l.rlim_cur = l.rlim_max; 2030 } else { 2031 l.rlim_cur = l.rlim_max + 1000; 2032 l.rlim_max = l.rlim_cur; 2033 } 2034 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 2035 (*set_rlimit) += 1; 2036 errno = old_errno; 2037 return true; 2038 } 2039 } 2040 errno = old_errno; 2041 } 2042 2043 return false; 2044 } 2045 2046 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 2047 struct perf_thread_map *threads, 2048 int start_cpu_map_idx, int end_cpu_map_idx) 2049 { 2050 int idx, thread, nthreads; 2051 int pid = -1, err, old_errno; 2052 enum rlimit_action set_rlimit = NO_CHANGE; 2053 2054 err = __evsel__prepare_open(evsel, cpus, threads); 2055 if (err) 2056 return err; 2057 2058 if (cpus == NULL) 2059 cpus = empty_cpu_map; 2060 2061 if (threads == NULL) 2062 threads = empty_thread_map; 2063 2064 if (evsel->core.system_wide) 2065 nthreads = 1; 2066 else 2067 nthreads = threads->nr; 2068 2069 if (evsel->cgrp) 2070 pid = evsel->cgrp->fd; 2071 2072 fallback_missing_features: 2073 evsel__disable_missing_features(evsel); 2074 2075 display_attr(&evsel->core.attr); 2076 2077 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { 2078 2079 for (thread = 0; thread < nthreads; thread++) { 2080 int fd, group_fd; 2081 retry_open: 2082 if (thread >= nthreads) 2083 break; 2084 2085 if (!evsel->cgrp && !evsel->core.system_wide) 2086 pid = perf_thread_map__pid(threads, thread); 2087 2088 group_fd = get_group_fd(evsel, idx, thread); 2089 2090 test_attr__ready(); 2091 2092 /* Debug message used by test scripts */ 2093 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 2094 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags); 2095 2096 fd = sys_perf_event_open(&evsel->core.attr, pid, 2097 perf_cpu_map__cpu(cpus, idx).cpu, 2098 group_fd, evsel->open_flags); 2099 2100 FD(evsel, idx, thread) = fd; 2101 2102 if (fd < 0) { 2103 err = -errno; 2104 2105 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 2106 err); 2107 goto try_fallback; 2108 } 2109 2110 bpf_counter__install_pe(evsel, idx, fd); 2111 2112 if (unlikely(test_attr__enabled)) { 2113 test_attr__open(&evsel->core.attr, pid, 2114 perf_cpu_map__cpu(cpus, idx), 2115 fd, group_fd, evsel->open_flags); 2116 } 2117 2118 /* Debug message used by test scripts */ 2119 pr_debug2_peo(" = %d\n", fd); 2120 2121 if (evsel->bpf_fd >= 0) { 2122 int evt_fd = fd; 2123 int bpf_fd = evsel->bpf_fd; 2124 2125 err = ioctl(evt_fd, 2126 PERF_EVENT_IOC_SET_BPF, 2127 bpf_fd); 2128 if (err && errno != EEXIST) { 2129 pr_err("failed to attach bpf fd %d: %s\n", 2130 bpf_fd, strerror(errno)); 2131 err = -EINVAL; 2132 goto out_close; 2133 } 2134 } 2135 2136 set_rlimit = NO_CHANGE; 2137 2138 /* 2139 * If we succeeded but had to kill clockid, fail and 2140 * have evsel__open_strerror() print us a nice error. 2141 */ 2142 if (perf_missing_features.clockid || 2143 perf_missing_features.clockid_wrong) { 2144 err = -EINVAL; 2145 goto out_close; 2146 } 2147 } 2148 } 2149 2150 return 0; 2151 2152 try_fallback: 2153 if (evsel__precise_ip_fallback(evsel)) 2154 goto retry_open; 2155 2156 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), 2157 idx, threads, thread, err)) { 2158 /* We just removed 1 thread, so lower the upper nthreads limit. */ 2159 nthreads--; 2160 2161 /* ... and pretend like nothing have happened. */ 2162 err = 0; 2163 goto retry_open; 2164 } 2165 /* 2166 * perf stat needs between 5 and 22 fds per CPU. When we run out 2167 * of them try to increase the limits. 2168 */ 2169 if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit)) 2170 goto retry_open; 2171 2172 if (err != -EINVAL || idx > 0 || thread > 0) 2173 goto out_close; 2174 2175 if (evsel__detect_missing_features(evsel)) 2176 goto fallback_missing_features; 2177 out_close: 2178 if (err) 2179 threads->err_thread = thread; 2180 2181 old_errno = errno; 2182 do { 2183 while (--thread >= 0) { 2184 if (FD(evsel, idx, thread) >= 0) 2185 close(FD(evsel, idx, thread)); 2186 FD(evsel, idx, thread) = -1; 2187 } 2188 thread = nthreads; 2189 } while (--idx >= 0); 2190 errno = old_errno; 2191 return err; 2192 } 2193 2194 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 2195 struct perf_thread_map *threads) 2196 { 2197 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2198 } 2199 2200 void evsel__close(struct evsel *evsel) 2201 { 2202 perf_evsel__close(&evsel->core); 2203 perf_evsel__free_id(&evsel->core); 2204 } 2205 2206 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx) 2207 { 2208 if (cpu_map_idx == -1) 2209 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus)); 2210 2211 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1); 2212 } 2213 2214 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 2215 { 2216 return evsel__open(evsel, NULL, threads); 2217 } 2218 2219 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 2220 const union perf_event *event, 2221 struct perf_sample *sample) 2222 { 2223 u64 type = evsel->core.attr.sample_type; 2224 const __u64 *array = event->sample.array; 2225 bool swapped = evsel->needs_swap; 2226 union u64_swap u; 2227 2228 array += ((event->header.size - 2229 sizeof(event->header)) / sizeof(u64)) - 1; 2230 2231 if (type & PERF_SAMPLE_IDENTIFIER) { 2232 sample->id = *array; 2233 array--; 2234 } 2235 2236 if (type & PERF_SAMPLE_CPU) { 2237 u.val64 = *array; 2238 if (swapped) { 2239 /* undo swap of u64, then swap on individual u32s */ 2240 u.val64 = bswap_64(u.val64); 2241 u.val32[0] = bswap_32(u.val32[0]); 2242 } 2243 2244 sample->cpu = u.val32[0]; 2245 array--; 2246 } 2247 2248 if (type & PERF_SAMPLE_STREAM_ID) { 2249 sample->stream_id = *array; 2250 array--; 2251 } 2252 2253 if (type & PERF_SAMPLE_ID) { 2254 sample->id = *array; 2255 array--; 2256 } 2257 2258 if (type & PERF_SAMPLE_TIME) { 2259 sample->time = *array; 2260 array--; 2261 } 2262 2263 if (type & PERF_SAMPLE_TID) { 2264 u.val64 = *array; 2265 if (swapped) { 2266 /* undo swap of u64, then swap on individual u32s */ 2267 u.val64 = bswap_64(u.val64); 2268 u.val32[0] = bswap_32(u.val32[0]); 2269 u.val32[1] = bswap_32(u.val32[1]); 2270 } 2271 2272 sample->pid = u.val32[0]; 2273 sample->tid = u.val32[1]; 2274 array--; 2275 } 2276 2277 return 0; 2278 } 2279 2280 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 2281 u64 size) 2282 { 2283 return size > max_size || offset + size > endp; 2284 } 2285 2286 #define OVERFLOW_CHECK(offset, size, max_size) \ 2287 do { \ 2288 if (overflow(endp, (max_size), (offset), (size))) \ 2289 return -EFAULT; \ 2290 } while (0) 2291 2292 #define OVERFLOW_CHECK_u64(offset) \ 2293 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 2294 2295 static int 2296 perf_event__check_size(union perf_event *event, unsigned int sample_size) 2297 { 2298 /* 2299 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 2300 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 2301 * check the format does not go past the end of the event. 2302 */ 2303 if (sample_size + sizeof(event->header) > event->header.size) 2304 return -EFAULT; 2305 2306 return 0; 2307 } 2308 2309 void __weak arch_perf_parse_sample_weight(struct perf_sample *data, 2310 const __u64 *array, 2311 u64 type __maybe_unused) 2312 { 2313 data->weight = *array; 2314 } 2315 2316 u64 evsel__bitfield_swap_branch_flags(u64 value) 2317 { 2318 u64 new_val = 0; 2319 2320 /* 2321 * branch_flags 2322 * union { 2323 * u64 values; 2324 * struct { 2325 * mispred:1 //target mispredicted 2326 * predicted:1 //target predicted 2327 * in_tx:1 //in transaction 2328 * abort:1 //transaction abort 2329 * cycles:16 //cycle count to last branch 2330 * type:4 //branch type 2331 * reserved:40 2332 * } 2333 * } 2334 * 2335 * Avoid bswap64() the entire branch_flag.value, 2336 * as it has variable bit-field sizes. Instead the 2337 * macro takes the bit-field position/size, 2338 * swaps it based on the host endianness. 2339 * 2340 * tep_is_bigendian() is used here instead of 2341 * bigendian() to avoid python test fails. 2342 */ 2343 if (tep_is_bigendian()) { 2344 new_val = bitfield_swap(value, 0, 1); 2345 new_val |= bitfield_swap(value, 1, 1); 2346 new_val |= bitfield_swap(value, 2, 1); 2347 new_val |= bitfield_swap(value, 3, 1); 2348 new_val |= bitfield_swap(value, 4, 16); 2349 new_val |= bitfield_swap(value, 20, 4); 2350 new_val |= bitfield_swap(value, 24, 40); 2351 } else { 2352 new_val = bitfield_swap(value, 63, 1); 2353 new_val |= bitfield_swap(value, 62, 1); 2354 new_val |= bitfield_swap(value, 61, 1); 2355 new_val |= bitfield_swap(value, 60, 1); 2356 new_val |= bitfield_swap(value, 44, 16); 2357 new_val |= bitfield_swap(value, 40, 4); 2358 new_val |= bitfield_swap(value, 0, 40); 2359 } 2360 2361 return new_val; 2362 } 2363 2364 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 2365 struct perf_sample *data) 2366 { 2367 u64 type = evsel->core.attr.sample_type; 2368 bool swapped = evsel->needs_swap; 2369 const __u64 *array; 2370 u16 max_size = event->header.size; 2371 const void *endp = (void *)event + max_size; 2372 u64 sz; 2373 2374 /* 2375 * used for cross-endian analysis. See git commit 65014ab3 2376 * for why this goofiness is needed. 2377 */ 2378 union u64_swap u; 2379 2380 memset(data, 0, sizeof(*data)); 2381 data->cpu = data->pid = data->tid = -1; 2382 data->stream_id = data->id = data->time = -1ULL; 2383 data->period = evsel->core.attr.sample_period; 2384 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 2385 data->misc = event->header.misc; 2386 data->id = -1ULL; 2387 data->data_src = PERF_MEM_DATA_SRC_NONE; 2388 data->vcpu = -1; 2389 2390 if (event->header.type != PERF_RECORD_SAMPLE) { 2391 if (!evsel->core.attr.sample_id_all) 2392 return 0; 2393 return perf_evsel__parse_id_sample(evsel, event, data); 2394 } 2395 2396 array = event->sample.array; 2397 2398 if (perf_event__check_size(event, evsel->sample_size)) 2399 return -EFAULT; 2400 2401 if (type & PERF_SAMPLE_IDENTIFIER) { 2402 data->id = *array; 2403 array++; 2404 } 2405 2406 if (type & PERF_SAMPLE_IP) { 2407 data->ip = *array; 2408 array++; 2409 } 2410 2411 if (type & PERF_SAMPLE_TID) { 2412 u.val64 = *array; 2413 if (swapped) { 2414 /* undo swap of u64, then swap on individual u32s */ 2415 u.val64 = bswap_64(u.val64); 2416 u.val32[0] = bswap_32(u.val32[0]); 2417 u.val32[1] = bswap_32(u.val32[1]); 2418 } 2419 2420 data->pid = u.val32[0]; 2421 data->tid = u.val32[1]; 2422 array++; 2423 } 2424 2425 if (type & PERF_SAMPLE_TIME) { 2426 data->time = *array; 2427 array++; 2428 } 2429 2430 if (type & PERF_SAMPLE_ADDR) { 2431 data->addr = *array; 2432 array++; 2433 } 2434 2435 if (type & PERF_SAMPLE_ID) { 2436 data->id = *array; 2437 array++; 2438 } 2439 2440 if (type & PERF_SAMPLE_STREAM_ID) { 2441 data->stream_id = *array; 2442 array++; 2443 } 2444 2445 if (type & PERF_SAMPLE_CPU) { 2446 2447 u.val64 = *array; 2448 if (swapped) { 2449 /* undo swap of u64, then swap on individual u32s */ 2450 u.val64 = bswap_64(u.val64); 2451 u.val32[0] = bswap_32(u.val32[0]); 2452 } 2453 2454 data->cpu = u.val32[0]; 2455 array++; 2456 } 2457 2458 if (type & PERF_SAMPLE_PERIOD) { 2459 data->period = *array; 2460 array++; 2461 } 2462 2463 if (type & PERF_SAMPLE_READ) { 2464 u64 read_format = evsel->core.attr.read_format; 2465 2466 OVERFLOW_CHECK_u64(array); 2467 if (read_format & PERF_FORMAT_GROUP) 2468 data->read.group.nr = *array; 2469 else 2470 data->read.one.value = *array; 2471 2472 array++; 2473 2474 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2475 OVERFLOW_CHECK_u64(array); 2476 data->read.time_enabled = *array; 2477 array++; 2478 } 2479 2480 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2481 OVERFLOW_CHECK_u64(array); 2482 data->read.time_running = *array; 2483 array++; 2484 } 2485 2486 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2487 if (read_format & PERF_FORMAT_GROUP) { 2488 const u64 max_group_nr = UINT64_MAX / 2489 sizeof(struct sample_read_value); 2490 2491 if (data->read.group.nr > max_group_nr) 2492 return -EFAULT; 2493 2494 sz = data->read.group.nr * sample_read_value_size(read_format); 2495 OVERFLOW_CHECK(array, sz, max_size); 2496 data->read.group.values = 2497 (struct sample_read_value *)array; 2498 array = (void *)array + sz; 2499 } else { 2500 OVERFLOW_CHECK_u64(array); 2501 data->read.one.id = *array; 2502 array++; 2503 2504 if (read_format & PERF_FORMAT_LOST) { 2505 OVERFLOW_CHECK_u64(array); 2506 data->read.one.lost = *array; 2507 array++; 2508 } 2509 } 2510 } 2511 2512 if (type & PERF_SAMPLE_CALLCHAIN) { 2513 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2514 2515 OVERFLOW_CHECK_u64(array); 2516 data->callchain = (struct ip_callchain *)array++; 2517 if (data->callchain->nr > max_callchain_nr) 2518 return -EFAULT; 2519 sz = data->callchain->nr * sizeof(u64); 2520 OVERFLOW_CHECK(array, sz, max_size); 2521 array = (void *)array + sz; 2522 } 2523 2524 if (type & PERF_SAMPLE_RAW) { 2525 OVERFLOW_CHECK_u64(array); 2526 u.val64 = *array; 2527 2528 /* 2529 * Undo swap of u64, then swap on individual u32s, 2530 * get the size of the raw area and undo all of the 2531 * swap. The pevent interface handles endianness by 2532 * itself. 2533 */ 2534 if (swapped) { 2535 u.val64 = bswap_64(u.val64); 2536 u.val32[0] = bswap_32(u.val32[0]); 2537 u.val32[1] = bswap_32(u.val32[1]); 2538 } 2539 data->raw_size = u.val32[0]; 2540 2541 /* 2542 * The raw data is aligned on 64bits including the 2543 * u32 size, so it's safe to use mem_bswap_64. 2544 */ 2545 if (swapped) 2546 mem_bswap_64((void *) array, data->raw_size); 2547 2548 array = (void *)array + sizeof(u32); 2549 2550 OVERFLOW_CHECK(array, data->raw_size, max_size); 2551 data->raw_data = (void *)array; 2552 array = (void *)array + data->raw_size; 2553 } 2554 2555 if (type & PERF_SAMPLE_BRANCH_STACK) { 2556 const u64 max_branch_nr = UINT64_MAX / 2557 sizeof(struct branch_entry); 2558 struct branch_entry *e; 2559 unsigned int i; 2560 2561 OVERFLOW_CHECK_u64(array); 2562 data->branch_stack = (struct branch_stack *)array++; 2563 2564 if (data->branch_stack->nr > max_branch_nr) 2565 return -EFAULT; 2566 2567 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2568 if (evsel__has_branch_hw_idx(evsel)) { 2569 sz += sizeof(u64); 2570 e = &data->branch_stack->entries[0]; 2571 } else { 2572 data->no_hw_idx = true; 2573 /* 2574 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, 2575 * only nr and entries[] will be output by kernel. 2576 */ 2577 e = (struct branch_entry *)&data->branch_stack->hw_idx; 2578 } 2579 2580 if (swapped) { 2581 /* 2582 * struct branch_flag does not have endian 2583 * specific bit field definition. And bswap 2584 * will not resolve the issue, since these 2585 * are bit fields. 2586 * 2587 * evsel__bitfield_swap_branch_flags() uses a 2588 * bitfield_swap macro to swap the bit position 2589 * based on the host endians. 2590 */ 2591 for (i = 0; i < data->branch_stack->nr; i++, e++) 2592 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); 2593 } 2594 2595 OVERFLOW_CHECK(array, sz, max_size); 2596 array = (void *)array + sz; 2597 } 2598 2599 if (type & PERF_SAMPLE_REGS_USER) { 2600 OVERFLOW_CHECK_u64(array); 2601 data->user_regs.abi = *array; 2602 array++; 2603 2604 if (data->user_regs.abi) { 2605 u64 mask = evsel->core.attr.sample_regs_user; 2606 2607 sz = hweight64(mask) * sizeof(u64); 2608 OVERFLOW_CHECK(array, sz, max_size); 2609 data->user_regs.mask = mask; 2610 data->user_regs.regs = (u64 *)array; 2611 array = (void *)array + sz; 2612 } 2613 } 2614 2615 if (type & PERF_SAMPLE_STACK_USER) { 2616 OVERFLOW_CHECK_u64(array); 2617 sz = *array++; 2618 2619 data->user_stack.offset = ((char *)(array - 1) 2620 - (char *) event); 2621 2622 if (!sz) { 2623 data->user_stack.size = 0; 2624 } else { 2625 OVERFLOW_CHECK(array, sz, max_size); 2626 data->user_stack.data = (char *)array; 2627 array = (void *)array + sz; 2628 OVERFLOW_CHECK_u64(array); 2629 data->user_stack.size = *array++; 2630 if (WARN_ONCE(data->user_stack.size > sz, 2631 "user stack dump failure\n")) 2632 return -EFAULT; 2633 } 2634 } 2635 2636 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 2637 OVERFLOW_CHECK_u64(array); 2638 arch_perf_parse_sample_weight(data, array, type); 2639 array++; 2640 } 2641 2642 if (type & PERF_SAMPLE_DATA_SRC) { 2643 OVERFLOW_CHECK_u64(array); 2644 data->data_src = *array; 2645 array++; 2646 } 2647 2648 if (type & PERF_SAMPLE_TRANSACTION) { 2649 OVERFLOW_CHECK_u64(array); 2650 data->transaction = *array; 2651 array++; 2652 } 2653 2654 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2655 if (type & PERF_SAMPLE_REGS_INTR) { 2656 OVERFLOW_CHECK_u64(array); 2657 data->intr_regs.abi = *array; 2658 array++; 2659 2660 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2661 u64 mask = evsel->core.attr.sample_regs_intr; 2662 2663 sz = hweight64(mask) * sizeof(u64); 2664 OVERFLOW_CHECK(array, sz, max_size); 2665 data->intr_regs.mask = mask; 2666 data->intr_regs.regs = (u64 *)array; 2667 array = (void *)array + sz; 2668 } 2669 } 2670 2671 data->phys_addr = 0; 2672 if (type & PERF_SAMPLE_PHYS_ADDR) { 2673 data->phys_addr = *array; 2674 array++; 2675 } 2676 2677 data->cgroup = 0; 2678 if (type & PERF_SAMPLE_CGROUP) { 2679 data->cgroup = *array; 2680 array++; 2681 } 2682 2683 data->data_page_size = 0; 2684 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 2685 data->data_page_size = *array; 2686 array++; 2687 } 2688 2689 data->code_page_size = 0; 2690 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 2691 data->code_page_size = *array; 2692 array++; 2693 } 2694 2695 if (type & PERF_SAMPLE_AUX) { 2696 OVERFLOW_CHECK_u64(array); 2697 sz = *array++; 2698 2699 OVERFLOW_CHECK(array, sz, max_size); 2700 /* Undo swap of data */ 2701 if (swapped) 2702 mem_bswap_64((char *)array, sz); 2703 data->aux_sample.size = sz; 2704 data->aux_sample.data = (char *)array; 2705 array = (void *)array + sz; 2706 } 2707 2708 return 0; 2709 } 2710 2711 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 2712 u64 *timestamp) 2713 { 2714 u64 type = evsel->core.attr.sample_type; 2715 const __u64 *array; 2716 2717 if (!(type & PERF_SAMPLE_TIME)) 2718 return -1; 2719 2720 if (event->header.type != PERF_RECORD_SAMPLE) { 2721 struct perf_sample data = { 2722 .time = -1ULL, 2723 }; 2724 2725 if (!evsel->core.attr.sample_id_all) 2726 return -1; 2727 if (perf_evsel__parse_id_sample(evsel, event, &data)) 2728 return -1; 2729 2730 *timestamp = data.time; 2731 return 0; 2732 } 2733 2734 array = event->sample.array; 2735 2736 if (perf_event__check_size(event, evsel->sample_size)) 2737 return -EFAULT; 2738 2739 if (type & PERF_SAMPLE_IDENTIFIER) 2740 array++; 2741 2742 if (type & PERF_SAMPLE_IP) 2743 array++; 2744 2745 if (type & PERF_SAMPLE_TID) 2746 array++; 2747 2748 if (type & PERF_SAMPLE_TIME) 2749 *timestamp = *array; 2750 2751 return 0; 2752 } 2753 2754 u16 evsel__id_hdr_size(struct evsel *evsel) 2755 { 2756 u64 sample_type = evsel->core.attr.sample_type; 2757 u16 size = 0; 2758 2759 if (sample_type & PERF_SAMPLE_TID) 2760 size += sizeof(u64); 2761 2762 if (sample_type & PERF_SAMPLE_TIME) 2763 size += sizeof(u64); 2764 2765 if (sample_type & PERF_SAMPLE_ID) 2766 size += sizeof(u64); 2767 2768 if (sample_type & PERF_SAMPLE_STREAM_ID) 2769 size += sizeof(u64); 2770 2771 if (sample_type & PERF_SAMPLE_CPU) 2772 size += sizeof(u64); 2773 2774 if (sample_type & PERF_SAMPLE_IDENTIFIER) 2775 size += sizeof(u64); 2776 2777 return size; 2778 } 2779 2780 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 2781 { 2782 return tep_find_field(evsel->tp_format, name); 2783 } 2784 2785 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 2786 { 2787 struct tep_format_field *field = evsel__field(evsel, name); 2788 int offset; 2789 2790 if (!field) 2791 return NULL; 2792 2793 offset = field->offset; 2794 2795 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 2796 offset = *(int *)(sample->raw_data + field->offset); 2797 offset &= 0xffff; 2798 if (field->flags & TEP_FIELD_IS_RELATIVE) 2799 offset += field->offset + field->size; 2800 } 2801 2802 return sample->raw_data + offset; 2803 } 2804 2805 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 2806 bool needs_swap) 2807 { 2808 u64 value; 2809 void *ptr = sample->raw_data + field->offset; 2810 2811 switch (field->size) { 2812 case 1: 2813 return *(u8 *)ptr; 2814 case 2: 2815 value = *(u16 *)ptr; 2816 break; 2817 case 4: 2818 value = *(u32 *)ptr; 2819 break; 2820 case 8: 2821 memcpy(&value, ptr, sizeof(u64)); 2822 break; 2823 default: 2824 return 0; 2825 } 2826 2827 if (!needs_swap) 2828 return value; 2829 2830 switch (field->size) { 2831 case 2: 2832 return bswap_16(value); 2833 case 4: 2834 return bswap_32(value); 2835 case 8: 2836 return bswap_64(value); 2837 default: 2838 return 0; 2839 } 2840 2841 return 0; 2842 } 2843 2844 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 2845 { 2846 struct tep_format_field *field = evsel__field(evsel, name); 2847 2848 if (!field) 2849 return 0; 2850 2851 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 2852 } 2853 2854 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize) 2855 { 2856 int paranoid; 2857 2858 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2859 evsel->core.attr.type == PERF_TYPE_HARDWARE && 2860 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2861 /* 2862 * If it's cycles then fall back to hrtimer based 2863 * cpu-clock-tick sw counter, which is always available even if 2864 * no PMU support. 2865 * 2866 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2867 * b0a873e). 2868 */ 2869 scnprintf(msg, msgsize, "%s", 2870 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2871 2872 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 2873 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK; 2874 2875 zfree(&evsel->name); 2876 return true; 2877 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 2878 (paranoid = perf_event_paranoid()) > 1) { 2879 const char *name = evsel__name(evsel); 2880 char *new_name; 2881 const char *sep = ":"; 2882 2883 /* If event has exclude user then don't exclude kernel. */ 2884 if (evsel->core.attr.exclude_user) 2885 return false; 2886 2887 /* Is there already the separator in the name. */ 2888 if (strchr(name, '/') || 2889 (strchr(name, ':') && !evsel->is_libpfm_event)) 2890 sep = ""; 2891 2892 if (asprintf(&new_name, "%s%su", name, sep) < 0) 2893 return false; 2894 2895 if (evsel->name) 2896 free(evsel->name); 2897 evsel->name = new_name; 2898 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 2899 "to fall back to excluding kernel and hypervisor " 2900 " samples", paranoid); 2901 evsel->core.attr.exclude_kernel = 1; 2902 evsel->core.attr.exclude_hv = 1; 2903 2904 return true; 2905 } 2906 2907 return false; 2908 } 2909 2910 static bool find_process(const char *name) 2911 { 2912 size_t len = strlen(name); 2913 DIR *dir; 2914 struct dirent *d; 2915 int ret = -1; 2916 2917 dir = opendir(procfs__mountpoint()); 2918 if (!dir) 2919 return false; 2920 2921 /* Walk through the directory. */ 2922 while (ret && (d = readdir(dir)) != NULL) { 2923 char path[PATH_MAX]; 2924 char *data; 2925 size_t size; 2926 2927 if ((d->d_type != DT_DIR) || 2928 !strcmp(".", d->d_name) || 2929 !strcmp("..", d->d_name)) 2930 continue; 2931 2932 scnprintf(path, sizeof(path), "%s/%s/comm", 2933 procfs__mountpoint(), d->d_name); 2934 2935 if (filename__read_str(path, &data, &size)) 2936 continue; 2937 2938 ret = strncmp(name, data, len); 2939 free(data); 2940 } 2941 2942 closedir(dir); 2943 return ret ? false : true; 2944 } 2945 2946 static bool is_amd(const char *arch, const char *cpuid) 2947 { 2948 return arch && !strcmp("x86", arch) && cpuid && strstarts(cpuid, "AuthenticAMD"); 2949 } 2950 2951 static bool is_amd_ibs(struct evsel *evsel) 2952 { 2953 return evsel->core.attr.precise_ip 2954 || (evsel->pmu_name && !strncmp(evsel->pmu_name, "ibs", 3)); 2955 } 2956 2957 int evsel__open_strerror(struct evsel *evsel, struct target *target, 2958 int err, char *msg, size_t size) 2959 { 2960 struct perf_env *env = evsel__env(evsel); 2961 const char *arch = perf_env__arch(env); 2962 const char *cpuid = perf_env__cpuid(env); 2963 char sbuf[STRERR_BUFSIZE]; 2964 int printed = 0, enforced = 0; 2965 2966 switch (err) { 2967 case EPERM: 2968 case EACCES: 2969 printed += scnprintf(msg + printed, size - printed, 2970 "Access to performance monitoring and observability operations is limited.\n"); 2971 2972 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 2973 if (enforced) { 2974 printed += scnprintf(msg + printed, size - printed, 2975 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 2976 "monitoring and observability operations. Inspect system audit records for\n" 2977 "more perf_event access control information and adjusting the policy.\n"); 2978 } 2979 } 2980 2981 if (err == EPERM) 2982 printed += scnprintf(msg, size, 2983 "No permission to enable %s event.\n\n", evsel__name(evsel)); 2984 2985 return scnprintf(msg + printed, size - printed, 2986 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 2987 "access to performance monitoring and observability operations for processes\n" 2988 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 2989 "More information can be found at 'Perf events and tool security' document:\n" 2990 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 2991 "perf_event_paranoid setting is %d:\n" 2992 " -1: Allow use of (almost) all events by all users\n" 2993 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 2994 ">= 0: Disallow raw and ftrace function tracepoint access\n" 2995 ">= 1: Disallow CPU event access\n" 2996 ">= 2: Disallow kernel profiling\n" 2997 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 2998 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 2999 perf_event_paranoid()); 3000 case ENOENT: 3001 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 3002 case EMFILE: 3003 return scnprintf(msg, size, "%s", 3004 "Too many events are opened.\n" 3005 "Probably the maximum number of open file descriptors has been reached.\n" 3006 "Hint: Try again after reducing the number of events.\n" 3007 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 3008 case ENOMEM: 3009 if (evsel__has_callchain(evsel) && 3010 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 3011 return scnprintf(msg, size, 3012 "Not enough memory to setup event with callchain.\n" 3013 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 3014 "Hint: Current value: %d", sysctl__max_stack()); 3015 break; 3016 case ENODEV: 3017 if (target->cpu_list) 3018 return scnprintf(msg, size, "%s", 3019 "No such device - did you specify an out-of-range profile CPU?"); 3020 break; 3021 case EOPNOTSUPP: 3022 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) 3023 return scnprintf(msg, size, 3024 "%s: PMU Hardware or event type doesn't support branch stack sampling.", 3025 evsel__name(evsel)); 3026 if (evsel->core.attr.aux_output) 3027 return scnprintf(msg, size, 3028 "%s: PMU Hardware doesn't support 'aux_output' feature", 3029 evsel__name(evsel)); 3030 if (evsel->core.attr.sample_period != 0) 3031 return scnprintf(msg, size, 3032 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 3033 evsel__name(evsel)); 3034 if (evsel->core.attr.precise_ip) 3035 return scnprintf(msg, size, "%s", 3036 "\'precise\' request may not be supported. Try removing 'p' modifier."); 3037 #if defined(__i386__) || defined(__x86_64__) 3038 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 3039 return scnprintf(msg, size, "%s", 3040 "No hardware sampling interrupt available.\n"); 3041 #endif 3042 break; 3043 case EBUSY: 3044 if (find_process("oprofiled")) 3045 return scnprintf(msg, size, 3046 "The PMU counters are busy/taken by another profiler.\n" 3047 "We found oprofile daemon running, please stop it and try again."); 3048 break; 3049 case EINVAL: 3050 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) 3051 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); 3052 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) 3053 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); 3054 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 3055 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 3056 if (perf_missing_features.clockid) 3057 return scnprintf(msg, size, "clockid feature not supported."); 3058 if (perf_missing_features.clockid_wrong) 3059 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 3060 if (perf_missing_features.aux_output) 3061 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 3062 if (!target__has_cpu(target)) 3063 return scnprintf(msg, size, 3064 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", 3065 evsel__name(evsel)); 3066 if (is_amd(arch, cpuid)) { 3067 if (is_amd_ibs(evsel)) { 3068 if (evsel->core.attr.exclude_kernel) 3069 return scnprintf(msg, size, 3070 "AMD IBS can't exclude kernel events. Try running at a higher privilege level."); 3071 if (!evsel->core.system_wide) 3072 return scnprintf(msg, size, 3073 "AMD IBS may only be available in system-wide/per-cpu mode. Try using -a, or -C and workload affinity"); 3074 } 3075 } 3076 3077 break; 3078 case ENODATA: 3079 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " 3080 "Please add an auxiliary event in front of the load latency event."); 3081 default: 3082 break; 3083 } 3084 3085 return scnprintf(msg, size, 3086 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 3087 "/bin/dmesg | grep -i perf may provide additional information.\n", 3088 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel)); 3089 } 3090 3091 struct perf_env *evsel__env(struct evsel *evsel) 3092 { 3093 if (evsel && evsel->evlist && evsel->evlist->env) 3094 return evsel->evlist->env; 3095 return &perf_env; 3096 } 3097 3098 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 3099 { 3100 int cpu_map_idx, thread; 3101 3102 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { 3103 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 3104 thread++) { 3105 int fd = FD(evsel, cpu_map_idx, thread); 3106 3107 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 3108 cpu_map_idx, thread, fd) < 0) 3109 return -1; 3110 } 3111 } 3112 3113 return 0; 3114 } 3115 3116 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 3117 { 3118 struct perf_cpu_map *cpus = evsel->core.cpus; 3119 struct perf_thread_map *threads = evsel->core.threads; 3120 3121 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr)) 3122 return -ENOMEM; 3123 3124 return store_evsel_ids(evsel, evlist); 3125 } 3126 3127 void evsel__zero_per_pkg(struct evsel *evsel) 3128 { 3129 struct hashmap_entry *cur; 3130 size_t bkt; 3131 3132 if (evsel->per_pkg_mask) { 3133 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) 3134 free((char *)cur->key); 3135 3136 hashmap__clear(evsel->per_pkg_mask); 3137 } 3138 } 3139 3140 bool evsel__is_hybrid(struct evsel *evsel) 3141 { 3142 return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name); 3143 } 3144 3145 struct evsel *evsel__leader(struct evsel *evsel) 3146 { 3147 return container_of(evsel->core.leader, struct evsel, core); 3148 } 3149 3150 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) 3151 { 3152 return evsel->core.leader == &leader->core; 3153 } 3154 3155 bool evsel__is_leader(struct evsel *evsel) 3156 { 3157 return evsel__has_leader(evsel, evsel); 3158 } 3159 3160 void evsel__set_leader(struct evsel *evsel, struct evsel *leader) 3161 { 3162 evsel->core.leader = &leader->core; 3163 } 3164 3165 int evsel__source_count(const struct evsel *evsel) 3166 { 3167 struct evsel *pos; 3168 int count = 0; 3169 3170 evlist__for_each_entry(evsel->evlist, pos) { 3171 if (pos->metric_leader == evsel) 3172 count++; 3173 } 3174 return count; 3175 } 3176 3177 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) 3178 { 3179 return false; 3180 } 3181 3182 /* 3183 * Remove an event from a given group (leader). 3184 * Some events, e.g., perf metrics Topdown events, 3185 * must always be grouped. Ignore the events. 3186 */ 3187 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) 3188 { 3189 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { 3190 evsel__set_leader(evsel, evsel); 3191 evsel->core.nr_members = 0; 3192 leader->core.nr_members--; 3193 } 3194 } 3195