1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 4 * 5 * Parts came from builtin-{top,stat,record}.c, see those files for further 6 * copyright notes. 7 */ 8 9 #include <byteswap.h> 10 #include <errno.h> 11 #include <inttypes.h> 12 #include <linux/bitops.h> 13 #include <api/fs/fs.h> 14 #include <api/fs/tracing_path.h> 15 #include <linux/hw_breakpoint.h> 16 #include <linux/perf_event.h> 17 #include <linux/compiler.h> 18 #include <linux/err.h> 19 #include <linux/zalloc.h> 20 #include <sys/ioctl.h> 21 #include <sys/resource.h> 22 #include <sys/types.h> 23 #include <dirent.h> 24 #include <stdlib.h> 25 #include <perf/evsel.h> 26 #include "asm/bug.h" 27 #include "bpf_counter.h" 28 #include "callchain.h" 29 #include "cgroup.h" 30 #include "counts.h" 31 #include "event.h" 32 #include "evsel.h" 33 #include "util/env.h" 34 #include "util/evsel_config.h" 35 #include "util/evsel_fprintf.h" 36 #include "evlist.h" 37 #include <perf/cpumap.h> 38 #include "thread_map.h" 39 #include "target.h" 40 #include "perf_regs.h" 41 #include "record.h" 42 #include "debug.h" 43 #include "trace-event.h" 44 #include "stat.h" 45 #include "string2.h" 46 #include "memswap.h" 47 #include "util.h" 48 #include "util/hashmap.h" 49 #include "off_cpu.h" 50 #include "pmu.h" 51 #include "pmus.h" 52 #include "../perf-sys.h" 53 #include "util/parse-branch-options.h" 54 #include "util/bpf-filter.h" 55 #include <internal/xyarray.h> 56 #include <internal/lib.h> 57 #include <internal/threadmap.h> 58 59 #include <linux/ctype.h> 60 61 #ifdef HAVE_LIBTRACEEVENT 62 #include <traceevent/event-parse.h> 63 #endif 64 65 struct perf_missing_features perf_missing_features; 66 67 static clockid_t clockid; 68 69 static const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = { 70 NULL, 71 "duration_time", 72 "user_time", 73 "system_time", 74 }; 75 76 const char *perf_tool_event__to_str(enum perf_tool_event ev) 77 { 78 if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX) 79 return perf_tool_event__tool_names[ev]; 80 81 return NULL; 82 } 83 84 enum perf_tool_event perf_tool_event__from_str(const char *str) 85 { 86 int i; 87 88 perf_tool_event__for_each_event(i) { 89 if (!strcmp(str, perf_tool_event__tool_names[i])) 90 return i; 91 } 92 return PERF_TOOL_NONE; 93 } 94 95 96 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused) 97 { 98 return 0; 99 } 100 101 void __weak test_attr__ready(void) { } 102 103 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused) 104 { 105 } 106 107 static struct { 108 size_t size; 109 int (*init)(struct evsel *evsel); 110 void (*fini)(struct evsel *evsel); 111 } perf_evsel__object = { 112 .size = sizeof(struct evsel), 113 .init = evsel__no_extra_init, 114 .fini = evsel__no_extra_fini, 115 }; 116 117 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel), 118 void (*fini)(struct evsel *evsel)) 119 { 120 121 if (object_size == 0) 122 goto set_methods; 123 124 if (perf_evsel__object.size > object_size) 125 return -EINVAL; 126 127 perf_evsel__object.size = object_size; 128 129 set_methods: 130 if (init != NULL) 131 perf_evsel__object.init = init; 132 133 if (fini != NULL) 134 perf_evsel__object.fini = fini; 135 136 return 0; 137 } 138 139 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 140 141 int __evsel__sample_size(u64 sample_type) 142 { 143 u64 mask = sample_type & PERF_SAMPLE_MASK; 144 int size = 0; 145 int i; 146 147 for (i = 0; i < 64; i++) { 148 if (mask & (1ULL << i)) 149 size++; 150 } 151 152 size *= sizeof(u64); 153 154 return size; 155 } 156 157 /** 158 * __perf_evsel__calc_id_pos - calculate id_pos. 159 * @sample_type: sample type 160 * 161 * This function returns the position of the event id (PERF_SAMPLE_ID or 162 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 163 * perf_record_sample. 164 */ 165 static int __perf_evsel__calc_id_pos(u64 sample_type) 166 { 167 int idx = 0; 168 169 if (sample_type & PERF_SAMPLE_IDENTIFIER) 170 return 0; 171 172 if (!(sample_type & PERF_SAMPLE_ID)) 173 return -1; 174 175 if (sample_type & PERF_SAMPLE_IP) 176 idx += 1; 177 178 if (sample_type & PERF_SAMPLE_TID) 179 idx += 1; 180 181 if (sample_type & PERF_SAMPLE_TIME) 182 idx += 1; 183 184 if (sample_type & PERF_SAMPLE_ADDR) 185 idx += 1; 186 187 return idx; 188 } 189 190 /** 191 * __perf_evsel__calc_is_pos - calculate is_pos. 192 * @sample_type: sample type 193 * 194 * This function returns the position (counting backwards) of the event id 195 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 196 * sample_id_all is used there is an id sample appended to non-sample events. 197 */ 198 static int __perf_evsel__calc_is_pos(u64 sample_type) 199 { 200 int idx = 1; 201 202 if (sample_type & PERF_SAMPLE_IDENTIFIER) 203 return 1; 204 205 if (!(sample_type & PERF_SAMPLE_ID)) 206 return -1; 207 208 if (sample_type & PERF_SAMPLE_CPU) 209 idx += 1; 210 211 if (sample_type & PERF_SAMPLE_STREAM_ID) 212 idx += 1; 213 214 return idx; 215 } 216 217 void evsel__calc_id_pos(struct evsel *evsel) 218 { 219 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type); 220 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type); 221 } 222 223 void __evsel__set_sample_bit(struct evsel *evsel, 224 enum perf_event_sample_format bit) 225 { 226 if (!(evsel->core.attr.sample_type & bit)) { 227 evsel->core.attr.sample_type |= bit; 228 evsel->sample_size += sizeof(u64); 229 evsel__calc_id_pos(evsel); 230 } 231 } 232 233 void __evsel__reset_sample_bit(struct evsel *evsel, 234 enum perf_event_sample_format bit) 235 { 236 if (evsel->core.attr.sample_type & bit) { 237 evsel->core.attr.sample_type &= ~bit; 238 evsel->sample_size -= sizeof(u64); 239 evsel__calc_id_pos(evsel); 240 } 241 } 242 243 void evsel__set_sample_id(struct evsel *evsel, 244 bool can_sample_identifier) 245 { 246 if (can_sample_identifier) { 247 evsel__reset_sample_bit(evsel, ID); 248 evsel__set_sample_bit(evsel, IDENTIFIER); 249 } else { 250 evsel__set_sample_bit(evsel, ID); 251 } 252 evsel->core.attr.read_format |= PERF_FORMAT_ID; 253 } 254 255 /** 256 * evsel__is_function_event - Return whether given evsel is a function 257 * trace event 258 * 259 * @evsel - evsel selector to be tested 260 * 261 * Return %true if event is function trace event 262 */ 263 bool evsel__is_function_event(struct evsel *evsel) 264 { 265 #define FUNCTION_EVENT "ftrace:function" 266 267 return evsel->name && 268 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT)); 269 270 #undef FUNCTION_EVENT 271 } 272 273 void evsel__init(struct evsel *evsel, 274 struct perf_event_attr *attr, int idx) 275 { 276 perf_evsel__init(&evsel->core, attr, idx); 277 evsel->tracking = !idx; 278 evsel->unit = strdup(""); 279 evsel->scale = 1.0; 280 evsel->max_events = ULONG_MAX; 281 evsel->evlist = NULL; 282 evsel->bpf_obj = NULL; 283 evsel->bpf_fd = -1; 284 INIT_LIST_HEAD(&evsel->config_terms); 285 INIT_LIST_HEAD(&evsel->bpf_counter_list); 286 perf_evsel__object.init(evsel); 287 evsel->sample_size = __evsel__sample_size(attr->sample_type); 288 evsel__calc_id_pos(evsel); 289 evsel->cmdline_group_boundary = false; 290 evsel->metric_events = NULL; 291 evsel->per_pkg_mask = NULL; 292 evsel->collect_stat = false; 293 evsel->pmu_name = NULL; 294 evsel->group_pmu_name = NULL; 295 evsel->skippable = false; 296 } 297 298 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 299 { 300 struct evsel *evsel = zalloc(perf_evsel__object.size); 301 302 if (!evsel) 303 return NULL; 304 evsel__init(evsel, attr, idx); 305 306 if (evsel__is_bpf_output(evsel) && !attr->sample_type) { 307 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 308 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 309 evsel->core.attr.sample_period = 1; 310 } 311 312 if (evsel__is_clock(evsel)) { 313 free((char *)evsel->unit); 314 evsel->unit = strdup("msec"); 315 evsel->scale = 1e-6; 316 } 317 318 return evsel; 319 } 320 321 int copy_config_terms(struct list_head *dst, struct list_head *src) 322 { 323 struct evsel_config_term *pos, *tmp; 324 325 list_for_each_entry(pos, src, list) { 326 tmp = malloc(sizeof(*tmp)); 327 if (tmp == NULL) 328 return -ENOMEM; 329 330 *tmp = *pos; 331 if (tmp->free_str) { 332 tmp->val.str = strdup(pos->val.str); 333 if (tmp->val.str == NULL) { 334 free(tmp); 335 return -ENOMEM; 336 } 337 } 338 list_add_tail(&tmp->list, dst); 339 } 340 return 0; 341 } 342 343 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) 344 { 345 return copy_config_terms(&dst->config_terms, &src->config_terms); 346 } 347 348 /** 349 * evsel__clone - create a new evsel copied from @orig 350 * @orig: original evsel 351 * 352 * The assumption is that @orig is not configured nor opened yet. 353 * So we only care about the attributes that can be set while it's parsed. 354 */ 355 struct evsel *evsel__clone(struct evsel *orig) 356 { 357 struct evsel *evsel; 358 359 BUG_ON(orig->core.fd); 360 BUG_ON(orig->counts); 361 BUG_ON(orig->priv); 362 BUG_ON(orig->per_pkg_mask); 363 364 /* cannot handle BPF objects for now */ 365 if (orig->bpf_obj) 366 return NULL; 367 368 evsel = evsel__new(&orig->core.attr); 369 if (evsel == NULL) 370 return NULL; 371 372 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus); 373 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus); 374 evsel->core.threads = perf_thread_map__get(orig->core.threads); 375 evsel->core.nr_members = orig->core.nr_members; 376 evsel->core.system_wide = orig->core.system_wide; 377 evsel->core.requires_cpu = orig->core.requires_cpu; 378 evsel->core.is_pmu_core = orig->core.is_pmu_core; 379 380 if (orig->name) { 381 evsel->name = strdup(orig->name); 382 if (evsel->name == NULL) 383 goto out_err; 384 } 385 if (orig->group_name) { 386 evsel->group_name = strdup(orig->group_name); 387 if (evsel->group_name == NULL) 388 goto out_err; 389 } 390 if (orig->pmu_name) { 391 evsel->pmu_name = strdup(orig->pmu_name); 392 if (evsel->pmu_name == NULL) 393 goto out_err; 394 } 395 if (orig->group_pmu_name) { 396 evsel->group_pmu_name = strdup(orig->group_pmu_name); 397 if (evsel->group_pmu_name == NULL) 398 goto out_err; 399 } 400 if (orig->filter) { 401 evsel->filter = strdup(orig->filter); 402 if (evsel->filter == NULL) 403 goto out_err; 404 } 405 if (orig->metric_id) { 406 evsel->metric_id = strdup(orig->metric_id); 407 if (evsel->metric_id == NULL) 408 goto out_err; 409 } 410 evsel->cgrp = cgroup__get(orig->cgrp); 411 #ifdef HAVE_LIBTRACEEVENT 412 evsel->tp_format = orig->tp_format; 413 #endif 414 evsel->handler = orig->handler; 415 evsel->core.leader = orig->core.leader; 416 417 evsel->max_events = orig->max_events; 418 evsel->tool_event = orig->tool_event; 419 free((char *)evsel->unit); 420 evsel->unit = strdup(orig->unit); 421 if (evsel->unit == NULL) 422 goto out_err; 423 424 evsel->scale = orig->scale; 425 evsel->snapshot = orig->snapshot; 426 evsel->per_pkg = orig->per_pkg; 427 evsel->percore = orig->percore; 428 evsel->precise_max = orig->precise_max; 429 evsel->is_libpfm_event = orig->is_libpfm_event; 430 431 evsel->exclude_GH = orig->exclude_GH; 432 evsel->sample_read = orig->sample_read; 433 evsel->auto_merge_stats = orig->auto_merge_stats; 434 evsel->collect_stat = orig->collect_stat; 435 evsel->weak_group = orig->weak_group; 436 evsel->use_config_name = orig->use_config_name; 437 evsel->pmu = orig->pmu; 438 439 if (evsel__copy_config_terms(evsel, orig) < 0) 440 goto out_err; 441 442 return evsel; 443 444 out_err: 445 evsel__delete(evsel); 446 return NULL; 447 } 448 449 /* 450 * Returns pointer with encoded error via <linux/err.h> interface. 451 */ 452 #ifdef HAVE_LIBTRACEEVENT 453 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx) 454 { 455 struct evsel *evsel = zalloc(perf_evsel__object.size); 456 int err = -ENOMEM; 457 458 if (evsel == NULL) { 459 goto out_err; 460 } else { 461 struct perf_event_attr attr = { 462 .type = PERF_TYPE_TRACEPOINT, 463 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 464 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 465 }; 466 467 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 468 goto out_free; 469 470 evsel->tp_format = trace_event__tp_format(sys, name); 471 if (IS_ERR(evsel->tp_format)) { 472 err = PTR_ERR(evsel->tp_format); 473 goto out_free; 474 } 475 476 event_attr_init(&attr); 477 attr.config = evsel->tp_format->id; 478 attr.sample_period = 1; 479 evsel__init(evsel, &attr, idx); 480 } 481 482 return evsel; 483 484 out_free: 485 zfree(&evsel->name); 486 free(evsel); 487 out_err: 488 return ERR_PTR(err); 489 } 490 #endif 491 492 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = { 493 "cycles", 494 "instructions", 495 "cache-references", 496 "cache-misses", 497 "branches", 498 "branch-misses", 499 "bus-cycles", 500 "stalled-cycles-frontend", 501 "stalled-cycles-backend", 502 "ref-cycles", 503 }; 504 505 char *evsel__bpf_counter_events; 506 507 bool evsel__match_bpf_counter_events(const char *name) 508 { 509 int name_len; 510 bool match; 511 char *ptr; 512 513 if (!evsel__bpf_counter_events) 514 return false; 515 516 ptr = strstr(evsel__bpf_counter_events, name); 517 name_len = strlen(name); 518 519 /* check name matches a full token in evsel__bpf_counter_events */ 520 match = (ptr != NULL) && 521 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && 522 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); 523 524 return match; 525 } 526 527 static const char *__evsel__hw_name(u64 config) 528 { 529 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 530 return evsel__hw_names[config]; 531 532 return "unknown-hardware"; 533 } 534 535 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 536 { 537 int colon = 0, r = 0; 538 struct perf_event_attr *attr = &evsel->core.attr; 539 bool exclude_guest_default = false; 540 541 #define MOD_PRINT(context, mod) do { \ 542 if (!attr->exclude_##context) { \ 543 if (!colon) colon = ++r; \ 544 r += scnprintf(bf + r, size - r, "%c", mod); \ 545 } } while(0) 546 547 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 548 MOD_PRINT(kernel, 'k'); 549 MOD_PRINT(user, 'u'); 550 MOD_PRINT(hv, 'h'); 551 exclude_guest_default = true; 552 } 553 554 if (attr->precise_ip) { 555 if (!colon) 556 colon = ++r; 557 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 558 exclude_guest_default = true; 559 } 560 561 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 562 MOD_PRINT(host, 'H'); 563 MOD_PRINT(guest, 'G'); 564 } 565 #undef MOD_PRINT 566 if (colon) 567 bf[colon - 1] = ':'; 568 return r; 569 } 570 571 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 572 { 573 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 574 } 575 576 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 577 { 578 int r = arch_evsel__hw_name(evsel, bf, size); 579 return r + evsel__add_modifiers(evsel, bf + r, size - r); 580 } 581 582 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = { 583 "cpu-clock", 584 "task-clock", 585 "page-faults", 586 "context-switches", 587 "cpu-migrations", 588 "minor-faults", 589 "major-faults", 590 "alignment-faults", 591 "emulation-faults", 592 "dummy", 593 }; 594 595 static const char *__evsel__sw_name(u64 config) 596 { 597 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 598 return evsel__sw_names[config]; 599 return "unknown-software"; 600 } 601 602 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 603 { 604 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 605 return r + evsel__add_modifiers(evsel, bf + r, size - r); 606 } 607 608 static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size) 609 { 610 return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev)); 611 } 612 613 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 614 { 615 int r; 616 617 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 618 619 if (type & HW_BREAKPOINT_R) 620 r += scnprintf(bf + r, size - r, "r"); 621 622 if (type & HW_BREAKPOINT_W) 623 r += scnprintf(bf + r, size - r, "w"); 624 625 if (type & HW_BREAKPOINT_X) 626 r += scnprintf(bf + r, size - r, "x"); 627 628 return r; 629 } 630 631 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 632 { 633 struct perf_event_attr *attr = &evsel->core.attr; 634 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 635 return r + evsel__add_modifiers(evsel, bf + r, size - r); 636 } 637 638 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 639 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 640 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 641 { "LLC", "L2", }, 642 { "dTLB", "d-tlb", "Data-TLB", }, 643 { "iTLB", "i-tlb", "Instruction-TLB", }, 644 { "branch", "branches", "bpu", "btb", "bpc", }, 645 { "node", }, 646 }; 647 648 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 649 { "load", "loads", "read", }, 650 { "store", "stores", "write", }, 651 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 652 }; 653 654 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 655 { "refs", "Reference", "ops", "access", }, 656 { "misses", "miss", }, 657 }; 658 659 #define C(x) PERF_COUNT_HW_CACHE_##x 660 #define CACHE_READ (1 << C(OP_READ)) 661 #define CACHE_WRITE (1 << C(OP_WRITE)) 662 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 663 #define COP(x) (1 << x) 664 665 /* 666 * cache operation stat 667 * L1I : Read and prefetch only 668 * ITLB and BPU : Read-only 669 */ 670 static const unsigned long evsel__hw_cache_stat[C(MAX)] = { 671 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 672 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 673 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 674 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 675 [C(ITLB)] = (CACHE_READ), 676 [C(BPU)] = (CACHE_READ), 677 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 678 }; 679 680 bool evsel__is_cache_op_valid(u8 type, u8 op) 681 { 682 if (evsel__hw_cache_stat[type] & COP(op)) 683 return true; /* valid */ 684 else 685 return false; /* invalid */ 686 } 687 688 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 689 { 690 if (result) { 691 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 692 evsel__hw_cache_op[op][0], 693 evsel__hw_cache_result[result][0]); 694 } 695 696 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 697 evsel__hw_cache_op[op][1]); 698 } 699 700 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 701 { 702 u8 op, result, type = (config >> 0) & 0xff; 703 const char *err = "unknown-ext-hardware-cache-type"; 704 705 if (type >= PERF_COUNT_HW_CACHE_MAX) 706 goto out_err; 707 708 op = (config >> 8) & 0xff; 709 err = "unknown-ext-hardware-cache-op"; 710 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 711 goto out_err; 712 713 result = (config >> 16) & 0xff; 714 err = "unknown-ext-hardware-cache-result"; 715 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 716 goto out_err; 717 718 err = "invalid-cache"; 719 if (!evsel__is_cache_op_valid(type, op)) 720 goto out_err; 721 722 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 723 out_err: 724 return scnprintf(bf, size, "%s", err); 725 } 726 727 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 728 { 729 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 730 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 731 } 732 733 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 734 { 735 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 736 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 737 } 738 739 const char *evsel__name(struct evsel *evsel) 740 { 741 char bf[128]; 742 743 if (!evsel) 744 goto out_unknown; 745 746 if (evsel->name) 747 return evsel->name; 748 749 switch (evsel->core.attr.type) { 750 case PERF_TYPE_RAW: 751 evsel__raw_name(evsel, bf, sizeof(bf)); 752 break; 753 754 case PERF_TYPE_HARDWARE: 755 evsel__hw_name(evsel, bf, sizeof(bf)); 756 break; 757 758 case PERF_TYPE_HW_CACHE: 759 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 760 break; 761 762 case PERF_TYPE_SOFTWARE: 763 if (evsel__is_tool(evsel)) 764 evsel__tool_name(evsel->tool_event, bf, sizeof(bf)); 765 else 766 evsel__sw_name(evsel, bf, sizeof(bf)); 767 break; 768 769 case PERF_TYPE_TRACEPOINT: 770 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 771 break; 772 773 case PERF_TYPE_BREAKPOINT: 774 evsel__bp_name(evsel, bf, sizeof(bf)); 775 break; 776 777 default: 778 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 779 evsel->core.attr.type); 780 break; 781 } 782 783 evsel->name = strdup(bf); 784 785 if (evsel->name) 786 return evsel->name; 787 out_unknown: 788 return "unknown"; 789 } 790 791 bool evsel__name_is(struct evsel *evsel, const char *name) 792 { 793 return !strcmp(evsel__name(evsel), name); 794 } 795 796 const char *evsel__metric_id(const struct evsel *evsel) 797 { 798 if (evsel->metric_id) 799 return evsel->metric_id; 800 801 if (evsel__is_tool(evsel)) 802 return perf_tool_event__to_str(evsel->tool_event); 803 804 return "unknown"; 805 } 806 807 const char *evsel__group_name(struct evsel *evsel) 808 { 809 return evsel->group_name ?: "anon group"; 810 } 811 812 /* 813 * Returns the group details for the specified leader, 814 * with following rules. 815 * 816 * For record -e '{cycles,instructions}' 817 * 'anon group { cycles:u, instructions:u }' 818 * 819 * For record -e 'cycles,instructions' and report --group 820 * 'cycles:u, instructions:u' 821 */ 822 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 823 { 824 int ret = 0; 825 struct evsel *pos; 826 const char *group_name = evsel__group_name(evsel); 827 828 if (!evsel->forced_leader) 829 ret = scnprintf(buf, size, "%s { ", group_name); 830 831 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel)); 832 833 for_each_group_member(pos, evsel) 834 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos)); 835 836 if (!evsel->forced_leader) 837 ret += scnprintf(buf + ret, size - ret, " }"); 838 839 return ret; 840 } 841 842 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 843 struct callchain_param *param) 844 { 845 bool function = evsel__is_function_event(evsel); 846 struct perf_event_attr *attr = &evsel->core.attr; 847 848 evsel__set_sample_bit(evsel, CALLCHAIN); 849 850 attr->sample_max_stack = param->max_stack; 851 852 if (opts->kernel_callchains) 853 attr->exclude_callchain_user = 1; 854 if (opts->user_callchains) 855 attr->exclude_callchain_kernel = 1; 856 if (param->record_mode == CALLCHAIN_LBR) { 857 if (!opts->branch_stack) { 858 if (attr->exclude_user) { 859 pr_warning("LBR callstack option is only available " 860 "to get user callchain information. " 861 "Falling back to framepointers.\n"); 862 } else { 863 evsel__set_sample_bit(evsel, BRANCH_STACK); 864 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 865 PERF_SAMPLE_BRANCH_CALL_STACK | 866 PERF_SAMPLE_BRANCH_NO_CYCLES | 867 PERF_SAMPLE_BRANCH_NO_FLAGS | 868 PERF_SAMPLE_BRANCH_HW_INDEX; 869 } 870 } else 871 pr_warning("Cannot use LBR callstack with branch stack. " 872 "Falling back to framepointers.\n"); 873 } 874 875 if (param->record_mode == CALLCHAIN_DWARF) { 876 if (!function) { 877 evsel__set_sample_bit(evsel, REGS_USER); 878 evsel__set_sample_bit(evsel, STACK_USER); 879 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) { 880 attr->sample_regs_user |= DWARF_MINIMAL_REGS; 881 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 882 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 883 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 884 } else { 885 attr->sample_regs_user |= arch__user_reg_mask(); 886 } 887 attr->sample_stack_user = param->dump_size; 888 attr->exclude_callchain_user = 1; 889 } else { 890 pr_info("Cannot use DWARF unwind for function trace event," 891 " falling back to framepointers.\n"); 892 } 893 } 894 895 if (function) { 896 pr_info("Disabling user space callchains for function trace event.\n"); 897 attr->exclude_callchain_user = 1; 898 } 899 } 900 901 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 902 struct callchain_param *param) 903 { 904 if (param->enabled) 905 return __evsel__config_callchain(evsel, opts, param); 906 } 907 908 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param) 909 { 910 struct perf_event_attr *attr = &evsel->core.attr; 911 912 evsel__reset_sample_bit(evsel, CALLCHAIN); 913 if (param->record_mode == CALLCHAIN_LBR) { 914 evsel__reset_sample_bit(evsel, BRANCH_STACK); 915 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 916 PERF_SAMPLE_BRANCH_CALL_STACK | 917 PERF_SAMPLE_BRANCH_HW_INDEX); 918 } 919 if (param->record_mode == CALLCHAIN_DWARF) { 920 evsel__reset_sample_bit(evsel, REGS_USER); 921 evsel__reset_sample_bit(evsel, STACK_USER); 922 } 923 } 924 925 static void evsel__apply_config_terms(struct evsel *evsel, 926 struct record_opts *opts, bool track) 927 { 928 struct evsel_config_term *term; 929 struct list_head *config_terms = &evsel->config_terms; 930 struct perf_event_attr *attr = &evsel->core.attr; 931 /* callgraph default */ 932 struct callchain_param param = { 933 .record_mode = callchain_param.record_mode, 934 }; 935 u32 dump_size = 0; 936 int max_stack = 0; 937 const char *callgraph_buf = NULL; 938 939 list_for_each_entry(term, config_terms, list) { 940 switch (term->type) { 941 case EVSEL__CONFIG_TERM_PERIOD: 942 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 943 attr->sample_period = term->val.period; 944 attr->freq = 0; 945 evsel__reset_sample_bit(evsel, PERIOD); 946 } 947 break; 948 case EVSEL__CONFIG_TERM_FREQ: 949 if (!(term->weak && opts->user_freq != UINT_MAX)) { 950 attr->sample_freq = term->val.freq; 951 attr->freq = 1; 952 evsel__set_sample_bit(evsel, PERIOD); 953 } 954 break; 955 case EVSEL__CONFIG_TERM_TIME: 956 if (term->val.time) 957 evsel__set_sample_bit(evsel, TIME); 958 else 959 evsel__reset_sample_bit(evsel, TIME); 960 break; 961 case EVSEL__CONFIG_TERM_CALLGRAPH: 962 callgraph_buf = term->val.str; 963 break; 964 case EVSEL__CONFIG_TERM_BRANCH: 965 if (term->val.str && strcmp(term->val.str, "no")) { 966 evsel__set_sample_bit(evsel, BRANCH_STACK); 967 parse_branch_str(term->val.str, 968 &attr->branch_sample_type); 969 } else 970 evsel__reset_sample_bit(evsel, BRANCH_STACK); 971 break; 972 case EVSEL__CONFIG_TERM_STACK_USER: 973 dump_size = term->val.stack_user; 974 break; 975 case EVSEL__CONFIG_TERM_MAX_STACK: 976 max_stack = term->val.max_stack; 977 break; 978 case EVSEL__CONFIG_TERM_MAX_EVENTS: 979 evsel->max_events = term->val.max_events; 980 break; 981 case EVSEL__CONFIG_TERM_INHERIT: 982 /* 983 * attr->inherit should has already been set by 984 * evsel__config. If user explicitly set 985 * inherit using config terms, override global 986 * opt->no_inherit setting. 987 */ 988 attr->inherit = term->val.inherit ? 1 : 0; 989 break; 990 case EVSEL__CONFIG_TERM_OVERWRITE: 991 attr->write_backward = term->val.overwrite ? 1 : 0; 992 break; 993 case EVSEL__CONFIG_TERM_DRV_CFG: 994 break; 995 case EVSEL__CONFIG_TERM_PERCORE: 996 break; 997 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 998 attr->aux_output = term->val.aux_output ? 1 : 0; 999 break; 1000 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 1001 /* Already applied by auxtrace */ 1002 break; 1003 case EVSEL__CONFIG_TERM_CFG_CHG: 1004 break; 1005 default: 1006 break; 1007 } 1008 } 1009 1010 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 1011 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 1012 bool sample_address = false; 1013 1014 if (max_stack) { 1015 param.max_stack = max_stack; 1016 if (callgraph_buf == NULL) 1017 callgraph_buf = "fp"; 1018 } 1019 1020 /* parse callgraph parameters */ 1021 if (callgraph_buf != NULL) { 1022 if (!strcmp(callgraph_buf, "no")) { 1023 param.enabled = false; 1024 param.record_mode = CALLCHAIN_NONE; 1025 } else { 1026 param.enabled = true; 1027 if (parse_callchain_record(callgraph_buf, ¶m)) { 1028 pr_err("per-event callgraph setting for %s failed. " 1029 "Apply callgraph global setting for it\n", 1030 evsel->name); 1031 return; 1032 } 1033 if (param.record_mode == CALLCHAIN_DWARF) 1034 sample_address = true; 1035 } 1036 } 1037 if (dump_size > 0) { 1038 dump_size = round_up(dump_size, sizeof(u64)); 1039 param.dump_size = dump_size; 1040 } 1041 1042 /* If global callgraph set, clear it */ 1043 if (callchain_param.enabled) 1044 evsel__reset_callgraph(evsel, &callchain_param); 1045 1046 /* set perf-event callgraph */ 1047 if (param.enabled) { 1048 if (sample_address) { 1049 evsel__set_sample_bit(evsel, ADDR); 1050 evsel__set_sample_bit(evsel, DATA_SRC); 1051 evsel->core.attr.mmap_data = track; 1052 } 1053 evsel__config_callchain(evsel, opts, ¶m); 1054 } 1055 } 1056 } 1057 1058 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 1059 { 1060 struct evsel_config_term *term, *found_term = NULL; 1061 1062 list_for_each_entry(term, &evsel->config_terms, list) { 1063 if (term->type == type) 1064 found_term = term; 1065 } 1066 1067 return found_term; 1068 } 1069 1070 void __weak arch_evsel__set_sample_weight(struct evsel *evsel) 1071 { 1072 evsel__set_sample_bit(evsel, WEIGHT); 1073 } 1074 1075 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, 1076 struct perf_event_attr *attr __maybe_unused) 1077 { 1078 } 1079 1080 static void evsel__set_default_freq_period(struct record_opts *opts, 1081 struct perf_event_attr *attr) 1082 { 1083 if (opts->freq) { 1084 attr->freq = 1; 1085 attr->sample_freq = opts->freq; 1086 } else { 1087 attr->sample_period = opts->default_interval; 1088 } 1089 } 1090 1091 static bool evsel__is_offcpu_event(struct evsel *evsel) 1092 { 1093 return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT); 1094 } 1095 1096 /* 1097 * The enable_on_exec/disabled value strategy: 1098 * 1099 * 1) For any type of traced program: 1100 * - all independent events and group leaders are disabled 1101 * - all group members are enabled 1102 * 1103 * Group members are ruled by group leaders. They need to 1104 * be enabled, because the group scheduling relies on that. 1105 * 1106 * 2) For traced programs executed by perf: 1107 * - all independent events and group leaders have 1108 * enable_on_exec set 1109 * - we don't specifically enable or disable any event during 1110 * the record command 1111 * 1112 * Independent events and group leaders are initially disabled 1113 * and get enabled by exec. Group members are ruled by group 1114 * leaders as stated in 1). 1115 * 1116 * 3) For traced programs attached by perf (pid/tid): 1117 * - we specifically enable or disable all events during 1118 * the record command 1119 * 1120 * When attaching events to already running traced we 1121 * enable/disable events specifically, as there's no 1122 * initial traced exec call. 1123 */ 1124 void evsel__config(struct evsel *evsel, struct record_opts *opts, 1125 struct callchain_param *callchain) 1126 { 1127 struct evsel *leader = evsel__leader(evsel); 1128 struct perf_event_attr *attr = &evsel->core.attr; 1129 int track = evsel->tracking; 1130 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 1131 1132 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 1133 attr->inherit = !opts->no_inherit; 1134 attr->write_backward = opts->overwrite ? 1 : 0; 1135 attr->read_format = PERF_FORMAT_LOST; 1136 1137 evsel__set_sample_bit(evsel, IP); 1138 evsel__set_sample_bit(evsel, TID); 1139 1140 if (evsel->sample_read) { 1141 evsel__set_sample_bit(evsel, READ); 1142 1143 /* 1144 * We need ID even in case of single event, because 1145 * PERF_SAMPLE_READ process ID specific data. 1146 */ 1147 evsel__set_sample_id(evsel, false); 1148 1149 /* 1150 * Apply group format only if we belong to group 1151 * with more than one members. 1152 */ 1153 if (leader->core.nr_members > 1) { 1154 attr->read_format |= PERF_FORMAT_GROUP; 1155 attr->inherit = 0; 1156 } 1157 } 1158 1159 /* 1160 * We default some events to have a default interval. But keep 1161 * it a weak assumption overridable by the user. 1162 */ 1163 if ((evsel->is_libpfm_event && !attr->sample_period) || 1164 (!evsel->is_libpfm_event && (!attr->sample_period || 1165 opts->user_freq != UINT_MAX || 1166 opts->user_interval != ULLONG_MAX))) 1167 evsel__set_default_freq_period(opts, attr); 1168 1169 /* 1170 * If attr->freq was set (here or earlier), ask for period 1171 * to be sampled. 1172 */ 1173 if (attr->freq) 1174 evsel__set_sample_bit(evsel, PERIOD); 1175 1176 if (opts->no_samples) 1177 attr->sample_freq = 0; 1178 1179 if (opts->inherit_stat) { 1180 evsel->core.attr.read_format |= 1181 PERF_FORMAT_TOTAL_TIME_ENABLED | 1182 PERF_FORMAT_TOTAL_TIME_RUNNING | 1183 PERF_FORMAT_ID; 1184 attr->inherit_stat = 1; 1185 } 1186 1187 if (opts->sample_address) { 1188 evsel__set_sample_bit(evsel, ADDR); 1189 attr->mmap_data = track; 1190 } 1191 1192 /* 1193 * We don't allow user space callchains for function trace 1194 * event, due to issues with page faults while tracing page 1195 * fault handler and its overall trickiness nature. 1196 */ 1197 if (evsel__is_function_event(evsel)) 1198 evsel->core.attr.exclude_callchain_user = 1; 1199 1200 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1201 evsel__config_callchain(evsel, opts, callchain); 1202 1203 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1204 !evsel__is_dummy_event(evsel)) { 1205 attr->sample_regs_intr = opts->sample_intr_regs; 1206 evsel__set_sample_bit(evsel, REGS_INTR); 1207 } 1208 1209 if (opts->sample_user_regs && !evsel->no_aux_samples && 1210 !evsel__is_dummy_event(evsel)) { 1211 attr->sample_regs_user |= opts->sample_user_regs; 1212 evsel__set_sample_bit(evsel, REGS_USER); 1213 } 1214 1215 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1216 evsel__set_sample_bit(evsel, CPU); 1217 1218 /* 1219 * When the user explicitly disabled time don't force it here. 1220 */ 1221 if (opts->sample_time && 1222 (!perf_missing_features.sample_id_all && 1223 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1224 opts->sample_time_set))) 1225 evsel__set_sample_bit(evsel, TIME); 1226 1227 if (opts->raw_samples && !evsel->no_aux_samples) { 1228 evsel__set_sample_bit(evsel, TIME); 1229 evsel__set_sample_bit(evsel, RAW); 1230 evsel__set_sample_bit(evsel, CPU); 1231 } 1232 1233 if (opts->sample_address) 1234 evsel__set_sample_bit(evsel, DATA_SRC); 1235 1236 if (opts->sample_phys_addr) 1237 evsel__set_sample_bit(evsel, PHYS_ADDR); 1238 1239 if (opts->no_buffering) { 1240 attr->watermark = 0; 1241 attr->wakeup_events = 1; 1242 } 1243 if (opts->branch_stack && !evsel->no_aux_samples) { 1244 evsel__set_sample_bit(evsel, BRANCH_STACK); 1245 attr->branch_sample_type = opts->branch_stack; 1246 } 1247 1248 if (opts->sample_weight) 1249 arch_evsel__set_sample_weight(evsel); 1250 1251 attr->task = track; 1252 attr->mmap = track; 1253 attr->mmap2 = track && !perf_missing_features.mmap2; 1254 attr->comm = track; 1255 attr->build_id = track && opts->build_id; 1256 1257 /* 1258 * ksymbol is tracked separately with text poke because it needs to be 1259 * system wide and enabled immediately. 1260 */ 1261 if (!opts->text_poke) 1262 attr->ksymbol = track && !perf_missing_features.ksymbol; 1263 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1264 1265 if (opts->record_namespaces) 1266 attr->namespaces = track; 1267 1268 if (opts->record_cgroup) { 1269 attr->cgroup = track && !perf_missing_features.cgroup; 1270 evsel__set_sample_bit(evsel, CGROUP); 1271 } 1272 1273 if (opts->sample_data_page_size) 1274 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); 1275 1276 if (opts->sample_code_page_size) 1277 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); 1278 1279 if (opts->record_switch_events) 1280 attr->context_switch = track; 1281 1282 if (opts->sample_transaction) 1283 evsel__set_sample_bit(evsel, TRANSACTION); 1284 1285 if (opts->running_time) { 1286 evsel->core.attr.read_format |= 1287 PERF_FORMAT_TOTAL_TIME_ENABLED | 1288 PERF_FORMAT_TOTAL_TIME_RUNNING; 1289 } 1290 1291 /* 1292 * XXX see the function comment above 1293 * 1294 * Disabling only independent events or group leaders, 1295 * keeping group members enabled. 1296 */ 1297 if (evsel__is_group_leader(evsel)) 1298 attr->disabled = 1; 1299 1300 /* 1301 * Setting enable_on_exec for independent events and 1302 * group leaders for traced executed by perf. 1303 */ 1304 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1305 !opts->target.initial_delay) 1306 attr->enable_on_exec = 1; 1307 1308 if (evsel->immediate) { 1309 attr->disabled = 0; 1310 attr->enable_on_exec = 0; 1311 } 1312 1313 clockid = opts->clockid; 1314 if (opts->use_clockid) { 1315 attr->use_clockid = 1; 1316 attr->clockid = opts->clockid; 1317 } 1318 1319 if (evsel->precise_max) 1320 attr->precise_ip = 3; 1321 1322 if (opts->all_user) { 1323 attr->exclude_kernel = 1; 1324 attr->exclude_user = 0; 1325 } 1326 1327 if (opts->all_kernel) { 1328 attr->exclude_kernel = 0; 1329 attr->exclude_user = 1; 1330 } 1331 1332 if (evsel->core.own_cpus || evsel->unit) 1333 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1334 1335 /* 1336 * Apply event specific term settings, 1337 * it overloads any global configuration. 1338 */ 1339 evsel__apply_config_terms(evsel, opts, track); 1340 1341 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1342 1343 /* The --period option takes the precedence. */ 1344 if (opts->period_set) { 1345 if (opts->period) 1346 evsel__set_sample_bit(evsel, PERIOD); 1347 else 1348 evsel__reset_sample_bit(evsel, PERIOD); 1349 } 1350 1351 /* 1352 * A dummy event never triggers any actual counter and therefore 1353 * cannot be used with branch_stack. 1354 * 1355 * For initial_delay, a dummy event is added implicitly. 1356 * The software event will trigger -EOPNOTSUPP error out, 1357 * if BRANCH_STACK bit is set. 1358 */ 1359 if (evsel__is_dummy_event(evsel)) 1360 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1361 1362 if (evsel__is_offcpu_event(evsel)) 1363 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; 1364 1365 arch__post_evsel_config(evsel, attr); 1366 } 1367 1368 int evsel__set_filter(struct evsel *evsel, const char *filter) 1369 { 1370 char *new_filter = strdup(filter); 1371 1372 if (new_filter != NULL) { 1373 free(evsel->filter); 1374 evsel->filter = new_filter; 1375 return 0; 1376 } 1377 1378 return -1; 1379 } 1380 1381 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1382 { 1383 char *new_filter; 1384 1385 if (evsel->filter == NULL) 1386 return evsel__set_filter(evsel, filter); 1387 1388 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1389 free(evsel->filter); 1390 evsel->filter = new_filter; 1391 return 0; 1392 } 1393 1394 return -1; 1395 } 1396 1397 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1398 { 1399 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1400 } 1401 1402 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1403 { 1404 return evsel__append_filter(evsel, "%s,%s", filter); 1405 } 1406 1407 /* Caller has to clear disabled after going through all CPUs. */ 1408 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx) 1409 { 1410 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); 1411 } 1412 1413 int evsel__enable(struct evsel *evsel) 1414 { 1415 int err = perf_evsel__enable(&evsel->core); 1416 1417 if (!err) 1418 evsel->disabled = false; 1419 return err; 1420 } 1421 1422 /* Caller has to set disabled after going through all CPUs. */ 1423 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx) 1424 { 1425 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); 1426 } 1427 1428 int evsel__disable(struct evsel *evsel) 1429 { 1430 int err = perf_evsel__disable(&evsel->core); 1431 /* 1432 * We mark it disabled here so that tools that disable a event can 1433 * ignore events after they disable it. I.e. the ring buffer may have 1434 * already a few more events queued up before the kernel got the stop 1435 * request. 1436 */ 1437 if (!err) 1438 evsel->disabled = true; 1439 1440 return err; 1441 } 1442 1443 void free_config_terms(struct list_head *config_terms) 1444 { 1445 struct evsel_config_term *term, *h; 1446 1447 list_for_each_entry_safe(term, h, config_terms, list) { 1448 list_del_init(&term->list); 1449 if (term->free_str) 1450 zfree(&term->val.str); 1451 free(term); 1452 } 1453 } 1454 1455 static void evsel__free_config_terms(struct evsel *evsel) 1456 { 1457 free_config_terms(&evsel->config_terms); 1458 } 1459 1460 void evsel__exit(struct evsel *evsel) 1461 { 1462 assert(list_empty(&evsel->core.node)); 1463 assert(evsel->evlist == NULL); 1464 bpf_counter__destroy(evsel); 1465 perf_bpf_filter__destroy(evsel); 1466 evsel__free_counts(evsel); 1467 perf_evsel__free_fd(&evsel->core); 1468 perf_evsel__free_id(&evsel->core); 1469 evsel__free_config_terms(evsel); 1470 cgroup__put(evsel->cgrp); 1471 perf_cpu_map__put(evsel->core.cpus); 1472 perf_cpu_map__put(evsel->core.own_cpus); 1473 perf_thread_map__put(evsel->core.threads); 1474 zfree(&evsel->group_name); 1475 zfree(&evsel->name); 1476 zfree(&evsel->pmu_name); 1477 zfree(&evsel->group_pmu_name); 1478 zfree(&evsel->unit); 1479 zfree(&evsel->metric_id); 1480 evsel__zero_per_pkg(evsel); 1481 hashmap__free(evsel->per_pkg_mask); 1482 evsel->per_pkg_mask = NULL; 1483 zfree(&evsel->metric_events); 1484 perf_evsel__object.fini(evsel); 1485 } 1486 1487 void evsel__delete(struct evsel *evsel) 1488 { 1489 if (!evsel) 1490 return; 1491 1492 evsel__exit(evsel); 1493 free(evsel); 1494 } 1495 1496 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread, 1497 struct perf_counts_values *count) 1498 { 1499 struct perf_counts_values tmp; 1500 1501 if (!evsel->prev_raw_counts) 1502 return; 1503 1504 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); 1505 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; 1506 1507 count->val = count->val - tmp.val; 1508 count->ena = count->ena - tmp.ena; 1509 count->run = count->run - tmp.run; 1510 } 1511 1512 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) 1513 { 1514 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); 1515 1516 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); 1517 } 1518 1519 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, 1520 u64 val, u64 ena, u64 run, u64 lost) 1521 { 1522 struct perf_counts_values *count; 1523 1524 count = perf_counts(counter->counts, cpu_map_idx, thread); 1525 1526 count->val = val; 1527 count->ena = ena; 1528 count->run = run; 1529 count->lost = lost; 1530 1531 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1532 } 1533 1534 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) 1535 { 1536 u64 read_format = leader->core.attr.read_format; 1537 struct sample_read_value *v; 1538 u64 nr, ena = 0, run = 0, lost = 0; 1539 1540 nr = *data++; 1541 1542 if (nr != (u64) leader->core.nr_members) 1543 return -EINVAL; 1544 1545 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1546 ena = *data++; 1547 1548 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1549 run = *data++; 1550 1551 v = (void *)data; 1552 sample_read_group__for_each(v, nr, read_format) { 1553 struct evsel *counter; 1554 1555 counter = evlist__id2evsel(leader->evlist, v->id); 1556 if (!counter) 1557 return -EINVAL; 1558 1559 if (read_format & PERF_FORMAT_LOST) 1560 lost = v->lost; 1561 1562 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); 1563 } 1564 1565 return 0; 1566 } 1567 1568 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread) 1569 { 1570 struct perf_stat_evsel *ps = leader->stats; 1571 u64 read_format = leader->core.attr.read_format; 1572 int size = perf_evsel__read_size(&leader->core); 1573 u64 *data = ps->group_data; 1574 1575 if (!(read_format & PERF_FORMAT_ID)) 1576 return -EINVAL; 1577 1578 if (!evsel__is_group_leader(leader)) 1579 return -EINVAL; 1580 1581 if (!data) { 1582 data = zalloc(size); 1583 if (!data) 1584 return -ENOMEM; 1585 1586 ps->group_data = data; 1587 } 1588 1589 if (FD(leader, cpu_map_idx, thread) < 0) 1590 return -EINVAL; 1591 1592 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) 1593 return -errno; 1594 1595 return evsel__process_group_data(leader, cpu_map_idx, thread, data); 1596 } 1597 1598 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) 1599 { 1600 u64 read_format = evsel->core.attr.read_format; 1601 1602 if (read_format & PERF_FORMAT_GROUP) 1603 return evsel__read_group(evsel, cpu_map_idx, thread); 1604 1605 return evsel__read_one(evsel, cpu_map_idx, thread); 1606 } 1607 1608 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) 1609 { 1610 struct perf_counts_values count; 1611 size_t nv = scale ? 3 : 1; 1612 1613 if (FD(evsel, cpu_map_idx, thread) < 0) 1614 return -EINVAL; 1615 1616 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) 1617 return -ENOMEM; 1618 1619 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) 1620 return -errno; 1621 1622 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); 1623 perf_counts_values__scale(&count, scale, NULL); 1624 *perf_counts(evsel->counts, cpu_map_idx, thread) = count; 1625 return 0; 1626 } 1627 1628 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, 1629 int cpu_map_idx) 1630 { 1631 struct perf_cpu cpu; 1632 1633 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); 1634 return perf_cpu_map__idx(other->core.cpus, cpu); 1635 } 1636 1637 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) 1638 { 1639 struct evsel *leader = evsel__leader(evsel); 1640 1641 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || 1642 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { 1643 return evsel__match_other_cpu(evsel, leader, cpu_map_idx); 1644 } 1645 1646 return cpu_map_idx; 1647 } 1648 1649 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) 1650 { 1651 struct evsel *leader = evsel__leader(evsel); 1652 int fd; 1653 1654 if (evsel__is_group_leader(evsel)) 1655 return -1; 1656 1657 /* 1658 * Leader must be already processed/open, 1659 * if not it's a bug. 1660 */ 1661 BUG_ON(!leader->core.fd); 1662 1663 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); 1664 if (cpu_map_idx == -1) 1665 return -1; 1666 1667 fd = FD(leader, cpu_map_idx, thread); 1668 BUG_ON(fd == -1 && !leader->skippable); 1669 1670 /* 1671 * When the leader has been skipped, return -2 to distinguish from no 1672 * group leader case. 1673 */ 1674 return fd == -1 ? -2 : fd; 1675 } 1676 1677 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx) 1678 { 1679 for (int cpu = 0; cpu < nr_cpus; cpu++) 1680 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1681 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1682 } 1683 1684 static int update_fds(struct evsel *evsel, 1685 int nr_cpus, int cpu_map_idx, 1686 int nr_threads, int thread_idx) 1687 { 1688 struct evsel *pos; 1689 1690 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) 1691 return -EINVAL; 1692 1693 evlist__for_each_entry(evsel->evlist, pos) { 1694 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; 1695 1696 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1697 1698 /* 1699 * Since fds for next evsel has not been created, 1700 * there is no need to iterate whole event list. 1701 */ 1702 if (pos == evsel) 1703 break; 1704 } 1705 return 0; 1706 } 1707 1708 static bool evsel__ignore_missing_thread(struct evsel *evsel, 1709 int nr_cpus, int cpu_map_idx, 1710 struct perf_thread_map *threads, 1711 int thread, int err) 1712 { 1713 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1714 1715 if (!evsel->ignore_missing_thread) 1716 return false; 1717 1718 /* The system wide setup does not work with threads. */ 1719 if (evsel->core.system_wide) 1720 return false; 1721 1722 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1723 if (err != -ESRCH) 1724 return false; 1725 1726 /* If there's only one thread, let it fail. */ 1727 if (threads->nr == 1) 1728 return false; 1729 1730 /* 1731 * We should remove fd for missing_thread first 1732 * because thread_map__remove() will decrease threads->nr. 1733 */ 1734 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread)) 1735 return false; 1736 1737 if (thread_map__remove(threads, thread)) 1738 return false; 1739 1740 pr_warning("WARNING: Ignored open failure for pid %d\n", 1741 ignore_pid); 1742 return true; 1743 } 1744 1745 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1746 void *priv __maybe_unused) 1747 { 1748 return fprintf(fp, " %-32s %s\n", name, val); 1749 } 1750 1751 static void display_attr(struct perf_event_attr *attr) 1752 { 1753 if (verbose >= 2 || debug_peo_args) { 1754 fprintf(stderr, "%.60s\n", graph_dotted_line); 1755 fprintf(stderr, "perf_event_attr:\n"); 1756 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 1757 fprintf(stderr, "%.60s\n", graph_dotted_line); 1758 } 1759 } 1760 1761 bool evsel__precise_ip_fallback(struct evsel *evsel) 1762 { 1763 /* Do not try less precise if not requested. */ 1764 if (!evsel->precise_max) 1765 return false; 1766 1767 /* 1768 * We tried all the precise_ip values, and it's 1769 * still failing, so leave it to standard fallback. 1770 */ 1771 if (!evsel->core.attr.precise_ip) { 1772 evsel->core.attr.precise_ip = evsel->precise_ip_original; 1773 return false; 1774 } 1775 1776 if (!evsel->precise_ip_original) 1777 evsel->precise_ip_original = evsel->core.attr.precise_ip; 1778 1779 evsel->core.attr.precise_ip--; 1780 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 1781 display_attr(&evsel->core.attr); 1782 return true; 1783 } 1784 1785 static struct perf_cpu_map *empty_cpu_map; 1786 static struct perf_thread_map *empty_thread_map; 1787 1788 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 1789 struct perf_thread_map *threads) 1790 { 1791 int nthreads = perf_thread_map__nr(threads); 1792 1793 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 1794 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 1795 return -EINVAL; 1796 1797 if (cpus == NULL) { 1798 if (empty_cpu_map == NULL) { 1799 empty_cpu_map = perf_cpu_map__dummy_new(); 1800 if (empty_cpu_map == NULL) 1801 return -ENOMEM; 1802 } 1803 1804 cpus = empty_cpu_map; 1805 } 1806 1807 if (threads == NULL) { 1808 if (empty_thread_map == NULL) { 1809 empty_thread_map = thread_map__new_by_tid(-1); 1810 if (empty_thread_map == NULL) 1811 return -ENOMEM; 1812 } 1813 1814 threads = empty_thread_map; 1815 } 1816 1817 if (evsel->core.fd == NULL && 1818 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) 1819 return -ENOMEM; 1820 1821 evsel->open_flags = PERF_FLAG_FD_CLOEXEC; 1822 if (evsel->cgrp) 1823 evsel->open_flags |= PERF_FLAG_PID_CGROUP; 1824 1825 return 0; 1826 } 1827 1828 static void evsel__disable_missing_features(struct evsel *evsel) 1829 { 1830 if (perf_missing_features.read_lost) 1831 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST; 1832 if (perf_missing_features.weight_struct) { 1833 evsel__set_sample_bit(evsel, WEIGHT); 1834 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT); 1835 } 1836 if (perf_missing_features.clockid_wrong) 1837 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1838 if (perf_missing_features.clockid) { 1839 evsel->core.attr.use_clockid = 0; 1840 evsel->core.attr.clockid = 0; 1841 } 1842 if (perf_missing_features.cloexec) 1843 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1844 if (perf_missing_features.mmap2) 1845 evsel->core.attr.mmap2 = 0; 1846 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest) 1847 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 1848 if (perf_missing_features.lbr_flags) 1849 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 1850 PERF_SAMPLE_BRANCH_NO_CYCLES); 1851 if (perf_missing_features.group_read && evsel->core.attr.inherit) 1852 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 1853 if (perf_missing_features.ksymbol) 1854 evsel->core.attr.ksymbol = 0; 1855 if (perf_missing_features.bpf) 1856 evsel->core.attr.bpf_event = 0; 1857 if (perf_missing_features.branch_hw_idx) 1858 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX; 1859 if (perf_missing_features.sample_id_all) 1860 evsel->core.attr.sample_id_all = 0; 1861 } 1862 1863 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 1864 struct perf_thread_map *threads) 1865 { 1866 int err; 1867 1868 err = __evsel__prepare_open(evsel, cpus, threads); 1869 if (err) 1870 return err; 1871 1872 evsel__disable_missing_features(evsel); 1873 1874 return err; 1875 } 1876 1877 bool evsel__detect_missing_features(struct evsel *evsel) 1878 { 1879 /* 1880 * Must probe features in the order they were added to the 1881 * perf_event_attr interface. 1882 */ 1883 if (!perf_missing_features.read_lost && 1884 (evsel->core.attr.read_format & PERF_FORMAT_LOST)) { 1885 perf_missing_features.read_lost = true; 1886 pr_debug2("switching off PERF_FORMAT_LOST support\n"); 1887 return true; 1888 } else if (!perf_missing_features.weight_struct && 1889 (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { 1890 perf_missing_features.weight_struct = true; 1891 pr_debug2("switching off weight struct support\n"); 1892 return true; 1893 } else if (!perf_missing_features.code_page_size && 1894 (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { 1895 perf_missing_features.code_page_size = true; 1896 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); 1897 return false; 1898 } else if (!perf_missing_features.data_page_size && 1899 (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { 1900 perf_missing_features.data_page_size = true; 1901 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); 1902 return false; 1903 } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { 1904 perf_missing_features.cgroup = true; 1905 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); 1906 return false; 1907 } else if (!perf_missing_features.branch_hw_idx && 1908 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { 1909 perf_missing_features.branch_hw_idx = true; 1910 pr_debug2("switching off branch HW index support\n"); 1911 return true; 1912 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 1913 perf_missing_features.aux_output = true; 1914 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); 1915 return false; 1916 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 1917 perf_missing_features.bpf = true; 1918 pr_debug2_peo("switching off bpf_event\n"); 1919 return true; 1920 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 1921 perf_missing_features.ksymbol = true; 1922 pr_debug2_peo("switching off ksymbol\n"); 1923 return true; 1924 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 1925 perf_missing_features.write_backward = true; 1926 pr_debug2_peo("switching off write_backward\n"); 1927 return false; 1928 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 1929 perf_missing_features.clockid_wrong = true; 1930 pr_debug2_peo("switching off clockid\n"); 1931 return true; 1932 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 1933 perf_missing_features.clockid = true; 1934 pr_debug2_peo("switching off use_clockid\n"); 1935 return true; 1936 } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { 1937 perf_missing_features.cloexec = true; 1938 pr_debug2_peo("switching off cloexec flag\n"); 1939 return true; 1940 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 1941 perf_missing_features.mmap2 = true; 1942 pr_debug2_peo("switching off mmap2\n"); 1943 return true; 1944 } else if (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) { 1945 if (evsel->pmu == NULL) 1946 evsel->pmu = evsel__find_pmu(evsel); 1947 1948 if (evsel->pmu) 1949 evsel->pmu->missing_features.exclude_guest = true; 1950 else { 1951 /* we cannot find PMU, disable attrs now */ 1952 evsel->core.attr.exclude_host = false; 1953 evsel->core.attr.exclude_guest = false; 1954 } 1955 1956 if (evsel->exclude_GH) { 1957 pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n"); 1958 return false; 1959 } 1960 if (!perf_missing_features.exclude_guest) { 1961 perf_missing_features.exclude_guest = true; 1962 pr_debug2_peo("switching off exclude_guest, exclude_host\n"); 1963 } 1964 return true; 1965 } else if (!perf_missing_features.sample_id_all) { 1966 perf_missing_features.sample_id_all = true; 1967 pr_debug2_peo("switching off sample_id_all\n"); 1968 return true; 1969 } else if (!perf_missing_features.lbr_flags && 1970 (evsel->core.attr.branch_sample_type & 1971 (PERF_SAMPLE_BRANCH_NO_CYCLES | 1972 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 1973 perf_missing_features.lbr_flags = true; 1974 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 1975 return true; 1976 } else if (!perf_missing_features.group_read && 1977 evsel->core.attr.inherit && 1978 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 1979 evsel__is_group_leader(evsel)) { 1980 perf_missing_features.group_read = true; 1981 pr_debug2_peo("switching off group read\n"); 1982 return true; 1983 } else { 1984 return false; 1985 } 1986 } 1987 1988 bool evsel__increase_rlimit(enum rlimit_action *set_rlimit) 1989 { 1990 int old_errno; 1991 struct rlimit l; 1992 1993 if (*set_rlimit < INCREASED_MAX) { 1994 old_errno = errno; 1995 1996 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 1997 if (*set_rlimit == NO_CHANGE) { 1998 l.rlim_cur = l.rlim_max; 1999 } else { 2000 l.rlim_cur = l.rlim_max + 1000; 2001 l.rlim_max = l.rlim_cur; 2002 } 2003 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 2004 (*set_rlimit) += 1; 2005 errno = old_errno; 2006 return true; 2007 } 2008 } 2009 errno = old_errno; 2010 } 2011 2012 return false; 2013 } 2014 2015 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 2016 struct perf_thread_map *threads, 2017 int start_cpu_map_idx, int end_cpu_map_idx) 2018 { 2019 int idx, thread, nthreads; 2020 int pid = -1, err, old_errno; 2021 enum rlimit_action set_rlimit = NO_CHANGE; 2022 2023 err = __evsel__prepare_open(evsel, cpus, threads); 2024 if (err) 2025 return err; 2026 2027 if (cpus == NULL) 2028 cpus = empty_cpu_map; 2029 2030 if (threads == NULL) 2031 threads = empty_thread_map; 2032 2033 nthreads = perf_thread_map__nr(threads); 2034 2035 if (evsel->cgrp) 2036 pid = evsel->cgrp->fd; 2037 2038 fallback_missing_features: 2039 evsel__disable_missing_features(evsel); 2040 2041 display_attr(&evsel->core.attr); 2042 2043 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { 2044 2045 for (thread = 0; thread < nthreads; thread++) { 2046 int fd, group_fd; 2047 retry_open: 2048 if (thread >= nthreads) 2049 break; 2050 2051 if (!evsel->cgrp && !evsel->core.system_wide) 2052 pid = perf_thread_map__pid(threads, thread); 2053 2054 group_fd = get_group_fd(evsel, idx, thread); 2055 2056 if (group_fd == -2) { 2057 pr_debug("broken group leader for %s\n", evsel->name); 2058 err = -EINVAL; 2059 goto out_close; 2060 } 2061 2062 test_attr__ready(); 2063 2064 /* Debug message used by test scripts */ 2065 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 2066 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags); 2067 2068 fd = sys_perf_event_open(&evsel->core.attr, pid, 2069 perf_cpu_map__cpu(cpus, idx).cpu, 2070 group_fd, evsel->open_flags); 2071 2072 FD(evsel, idx, thread) = fd; 2073 2074 if (fd < 0) { 2075 err = -errno; 2076 2077 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 2078 err); 2079 goto try_fallback; 2080 } 2081 2082 bpf_counter__install_pe(evsel, idx, fd); 2083 2084 if (unlikely(test_attr__enabled)) { 2085 test_attr__open(&evsel->core.attr, pid, 2086 perf_cpu_map__cpu(cpus, idx), 2087 fd, group_fd, evsel->open_flags); 2088 } 2089 2090 /* Debug message used by test scripts */ 2091 pr_debug2_peo(" = %d\n", fd); 2092 2093 if (evsel->bpf_fd >= 0) { 2094 int evt_fd = fd; 2095 int bpf_fd = evsel->bpf_fd; 2096 2097 err = ioctl(evt_fd, 2098 PERF_EVENT_IOC_SET_BPF, 2099 bpf_fd); 2100 if (err && errno != EEXIST) { 2101 pr_err("failed to attach bpf fd %d: %s\n", 2102 bpf_fd, strerror(errno)); 2103 err = -EINVAL; 2104 goto out_close; 2105 } 2106 } 2107 2108 set_rlimit = NO_CHANGE; 2109 2110 /* 2111 * If we succeeded but had to kill clockid, fail and 2112 * have evsel__open_strerror() print us a nice error. 2113 */ 2114 if (perf_missing_features.clockid || 2115 perf_missing_features.clockid_wrong) { 2116 err = -EINVAL; 2117 goto out_close; 2118 } 2119 } 2120 } 2121 2122 return 0; 2123 2124 try_fallback: 2125 if (evsel__precise_ip_fallback(evsel)) 2126 goto retry_open; 2127 2128 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), 2129 idx, threads, thread, err)) { 2130 /* We just removed 1 thread, so lower the upper nthreads limit. */ 2131 nthreads--; 2132 2133 /* ... and pretend like nothing have happened. */ 2134 err = 0; 2135 goto retry_open; 2136 } 2137 /* 2138 * perf stat needs between 5 and 22 fds per CPU. When we run out 2139 * of them try to increase the limits. 2140 */ 2141 if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit)) 2142 goto retry_open; 2143 2144 if (err != -EINVAL || idx > 0 || thread > 0) 2145 goto out_close; 2146 2147 if (evsel__detect_missing_features(evsel)) 2148 goto fallback_missing_features; 2149 out_close: 2150 if (err) 2151 threads->err_thread = thread; 2152 2153 old_errno = errno; 2154 do { 2155 while (--thread >= 0) { 2156 if (FD(evsel, idx, thread) >= 0) 2157 close(FD(evsel, idx, thread)); 2158 FD(evsel, idx, thread) = -1; 2159 } 2160 thread = nthreads; 2161 } while (--idx >= 0); 2162 errno = old_errno; 2163 return err; 2164 } 2165 2166 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 2167 struct perf_thread_map *threads) 2168 { 2169 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2170 } 2171 2172 void evsel__close(struct evsel *evsel) 2173 { 2174 perf_evsel__close(&evsel->core); 2175 perf_evsel__free_id(&evsel->core); 2176 } 2177 2178 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx) 2179 { 2180 if (cpu_map_idx == -1) 2181 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus)); 2182 2183 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1); 2184 } 2185 2186 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 2187 { 2188 return evsel__open(evsel, NULL, threads); 2189 } 2190 2191 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 2192 const union perf_event *event, 2193 struct perf_sample *sample) 2194 { 2195 u64 type = evsel->core.attr.sample_type; 2196 const __u64 *array = event->sample.array; 2197 bool swapped = evsel->needs_swap; 2198 union u64_swap u; 2199 2200 array += ((event->header.size - 2201 sizeof(event->header)) / sizeof(u64)) - 1; 2202 2203 if (type & PERF_SAMPLE_IDENTIFIER) { 2204 sample->id = *array; 2205 array--; 2206 } 2207 2208 if (type & PERF_SAMPLE_CPU) { 2209 u.val64 = *array; 2210 if (swapped) { 2211 /* undo swap of u64, then swap on individual u32s */ 2212 u.val64 = bswap_64(u.val64); 2213 u.val32[0] = bswap_32(u.val32[0]); 2214 } 2215 2216 sample->cpu = u.val32[0]; 2217 array--; 2218 } 2219 2220 if (type & PERF_SAMPLE_STREAM_ID) { 2221 sample->stream_id = *array; 2222 array--; 2223 } 2224 2225 if (type & PERF_SAMPLE_ID) { 2226 sample->id = *array; 2227 array--; 2228 } 2229 2230 if (type & PERF_SAMPLE_TIME) { 2231 sample->time = *array; 2232 array--; 2233 } 2234 2235 if (type & PERF_SAMPLE_TID) { 2236 u.val64 = *array; 2237 if (swapped) { 2238 /* undo swap of u64, then swap on individual u32s */ 2239 u.val64 = bswap_64(u.val64); 2240 u.val32[0] = bswap_32(u.val32[0]); 2241 u.val32[1] = bswap_32(u.val32[1]); 2242 } 2243 2244 sample->pid = u.val32[0]; 2245 sample->tid = u.val32[1]; 2246 array--; 2247 } 2248 2249 return 0; 2250 } 2251 2252 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 2253 u64 size) 2254 { 2255 return size > max_size || offset + size > endp; 2256 } 2257 2258 #define OVERFLOW_CHECK(offset, size, max_size) \ 2259 do { \ 2260 if (overflow(endp, (max_size), (offset), (size))) \ 2261 return -EFAULT; \ 2262 } while (0) 2263 2264 #define OVERFLOW_CHECK_u64(offset) \ 2265 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 2266 2267 static int 2268 perf_event__check_size(union perf_event *event, unsigned int sample_size) 2269 { 2270 /* 2271 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 2272 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 2273 * check the format does not go past the end of the event. 2274 */ 2275 if (sample_size + sizeof(event->header) > event->header.size) 2276 return -EFAULT; 2277 2278 return 0; 2279 } 2280 2281 void __weak arch_perf_parse_sample_weight(struct perf_sample *data, 2282 const __u64 *array, 2283 u64 type __maybe_unused) 2284 { 2285 data->weight = *array; 2286 } 2287 2288 u64 evsel__bitfield_swap_branch_flags(u64 value) 2289 { 2290 u64 new_val = 0; 2291 2292 /* 2293 * branch_flags 2294 * union { 2295 * u64 values; 2296 * struct { 2297 * mispred:1 //target mispredicted 2298 * predicted:1 //target predicted 2299 * in_tx:1 //in transaction 2300 * abort:1 //transaction abort 2301 * cycles:16 //cycle count to last branch 2302 * type:4 //branch type 2303 * spec:2 //branch speculation info 2304 * new_type:4 //additional branch type 2305 * priv:3 //privilege level 2306 * reserved:31 2307 * } 2308 * } 2309 * 2310 * Avoid bswap64() the entire branch_flag.value, 2311 * as it has variable bit-field sizes. Instead the 2312 * macro takes the bit-field position/size, 2313 * swaps it based on the host endianness. 2314 */ 2315 if (host_is_bigendian()) { 2316 new_val = bitfield_swap(value, 0, 1); 2317 new_val |= bitfield_swap(value, 1, 1); 2318 new_val |= bitfield_swap(value, 2, 1); 2319 new_val |= bitfield_swap(value, 3, 1); 2320 new_val |= bitfield_swap(value, 4, 16); 2321 new_val |= bitfield_swap(value, 20, 4); 2322 new_val |= bitfield_swap(value, 24, 2); 2323 new_val |= bitfield_swap(value, 26, 4); 2324 new_val |= bitfield_swap(value, 30, 3); 2325 new_val |= bitfield_swap(value, 33, 31); 2326 } else { 2327 new_val = bitfield_swap(value, 63, 1); 2328 new_val |= bitfield_swap(value, 62, 1); 2329 new_val |= bitfield_swap(value, 61, 1); 2330 new_val |= bitfield_swap(value, 60, 1); 2331 new_val |= bitfield_swap(value, 44, 16); 2332 new_val |= bitfield_swap(value, 40, 4); 2333 new_val |= bitfield_swap(value, 38, 2); 2334 new_val |= bitfield_swap(value, 34, 4); 2335 new_val |= bitfield_swap(value, 31, 3); 2336 new_val |= bitfield_swap(value, 0, 31); 2337 } 2338 2339 return new_val; 2340 } 2341 2342 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 2343 struct perf_sample *data) 2344 { 2345 u64 type = evsel->core.attr.sample_type; 2346 bool swapped = evsel->needs_swap; 2347 const __u64 *array; 2348 u16 max_size = event->header.size; 2349 const void *endp = (void *)event + max_size; 2350 u64 sz; 2351 2352 /* 2353 * used for cross-endian analysis. See git commit 65014ab3 2354 * for why this goofiness is needed. 2355 */ 2356 union u64_swap u; 2357 2358 memset(data, 0, sizeof(*data)); 2359 data->cpu = data->pid = data->tid = -1; 2360 data->stream_id = data->id = data->time = -1ULL; 2361 data->period = evsel->core.attr.sample_period; 2362 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 2363 data->misc = event->header.misc; 2364 data->id = -1ULL; 2365 data->data_src = PERF_MEM_DATA_SRC_NONE; 2366 data->vcpu = -1; 2367 2368 if (event->header.type != PERF_RECORD_SAMPLE) { 2369 if (!evsel->core.attr.sample_id_all) 2370 return 0; 2371 return perf_evsel__parse_id_sample(evsel, event, data); 2372 } 2373 2374 array = event->sample.array; 2375 2376 if (perf_event__check_size(event, evsel->sample_size)) 2377 return -EFAULT; 2378 2379 if (type & PERF_SAMPLE_IDENTIFIER) { 2380 data->id = *array; 2381 array++; 2382 } 2383 2384 if (type & PERF_SAMPLE_IP) { 2385 data->ip = *array; 2386 array++; 2387 } 2388 2389 if (type & PERF_SAMPLE_TID) { 2390 u.val64 = *array; 2391 if (swapped) { 2392 /* undo swap of u64, then swap on individual u32s */ 2393 u.val64 = bswap_64(u.val64); 2394 u.val32[0] = bswap_32(u.val32[0]); 2395 u.val32[1] = bswap_32(u.val32[1]); 2396 } 2397 2398 data->pid = u.val32[0]; 2399 data->tid = u.val32[1]; 2400 array++; 2401 } 2402 2403 if (type & PERF_SAMPLE_TIME) { 2404 data->time = *array; 2405 array++; 2406 } 2407 2408 if (type & PERF_SAMPLE_ADDR) { 2409 data->addr = *array; 2410 array++; 2411 } 2412 2413 if (type & PERF_SAMPLE_ID) { 2414 data->id = *array; 2415 array++; 2416 } 2417 2418 if (type & PERF_SAMPLE_STREAM_ID) { 2419 data->stream_id = *array; 2420 array++; 2421 } 2422 2423 if (type & PERF_SAMPLE_CPU) { 2424 2425 u.val64 = *array; 2426 if (swapped) { 2427 /* undo swap of u64, then swap on individual u32s */ 2428 u.val64 = bswap_64(u.val64); 2429 u.val32[0] = bswap_32(u.val32[0]); 2430 } 2431 2432 data->cpu = u.val32[0]; 2433 array++; 2434 } 2435 2436 if (type & PERF_SAMPLE_PERIOD) { 2437 data->period = *array; 2438 array++; 2439 } 2440 2441 if (type & PERF_SAMPLE_READ) { 2442 u64 read_format = evsel->core.attr.read_format; 2443 2444 OVERFLOW_CHECK_u64(array); 2445 if (read_format & PERF_FORMAT_GROUP) 2446 data->read.group.nr = *array; 2447 else 2448 data->read.one.value = *array; 2449 2450 array++; 2451 2452 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2453 OVERFLOW_CHECK_u64(array); 2454 data->read.time_enabled = *array; 2455 array++; 2456 } 2457 2458 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2459 OVERFLOW_CHECK_u64(array); 2460 data->read.time_running = *array; 2461 array++; 2462 } 2463 2464 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2465 if (read_format & PERF_FORMAT_GROUP) { 2466 const u64 max_group_nr = UINT64_MAX / 2467 sizeof(struct sample_read_value); 2468 2469 if (data->read.group.nr > max_group_nr) 2470 return -EFAULT; 2471 2472 sz = data->read.group.nr * sample_read_value_size(read_format); 2473 OVERFLOW_CHECK(array, sz, max_size); 2474 data->read.group.values = 2475 (struct sample_read_value *)array; 2476 array = (void *)array + sz; 2477 } else { 2478 OVERFLOW_CHECK_u64(array); 2479 data->read.one.id = *array; 2480 array++; 2481 2482 if (read_format & PERF_FORMAT_LOST) { 2483 OVERFLOW_CHECK_u64(array); 2484 data->read.one.lost = *array; 2485 array++; 2486 } 2487 } 2488 } 2489 2490 if (type & PERF_SAMPLE_CALLCHAIN) { 2491 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2492 2493 OVERFLOW_CHECK_u64(array); 2494 data->callchain = (struct ip_callchain *)array++; 2495 if (data->callchain->nr > max_callchain_nr) 2496 return -EFAULT; 2497 sz = data->callchain->nr * sizeof(u64); 2498 OVERFLOW_CHECK(array, sz, max_size); 2499 array = (void *)array + sz; 2500 } 2501 2502 if (type & PERF_SAMPLE_RAW) { 2503 OVERFLOW_CHECK_u64(array); 2504 u.val64 = *array; 2505 2506 /* 2507 * Undo swap of u64, then swap on individual u32s, 2508 * get the size of the raw area and undo all of the 2509 * swap. The pevent interface handles endianness by 2510 * itself. 2511 */ 2512 if (swapped) { 2513 u.val64 = bswap_64(u.val64); 2514 u.val32[0] = bswap_32(u.val32[0]); 2515 u.val32[1] = bswap_32(u.val32[1]); 2516 } 2517 data->raw_size = u.val32[0]; 2518 2519 /* 2520 * The raw data is aligned on 64bits including the 2521 * u32 size, so it's safe to use mem_bswap_64. 2522 */ 2523 if (swapped) 2524 mem_bswap_64((void *) array, data->raw_size); 2525 2526 array = (void *)array + sizeof(u32); 2527 2528 OVERFLOW_CHECK(array, data->raw_size, max_size); 2529 data->raw_data = (void *)array; 2530 array = (void *)array + data->raw_size; 2531 } 2532 2533 if (type & PERF_SAMPLE_BRANCH_STACK) { 2534 const u64 max_branch_nr = UINT64_MAX / 2535 sizeof(struct branch_entry); 2536 struct branch_entry *e; 2537 unsigned int i; 2538 2539 OVERFLOW_CHECK_u64(array); 2540 data->branch_stack = (struct branch_stack *)array++; 2541 2542 if (data->branch_stack->nr > max_branch_nr) 2543 return -EFAULT; 2544 2545 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2546 if (evsel__has_branch_hw_idx(evsel)) { 2547 sz += sizeof(u64); 2548 e = &data->branch_stack->entries[0]; 2549 } else { 2550 data->no_hw_idx = true; 2551 /* 2552 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, 2553 * only nr and entries[] will be output by kernel. 2554 */ 2555 e = (struct branch_entry *)&data->branch_stack->hw_idx; 2556 } 2557 2558 if (swapped) { 2559 /* 2560 * struct branch_flag does not have endian 2561 * specific bit field definition. And bswap 2562 * will not resolve the issue, since these 2563 * are bit fields. 2564 * 2565 * evsel__bitfield_swap_branch_flags() uses a 2566 * bitfield_swap macro to swap the bit position 2567 * based on the host endians. 2568 */ 2569 for (i = 0; i < data->branch_stack->nr; i++, e++) 2570 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); 2571 } 2572 2573 OVERFLOW_CHECK(array, sz, max_size); 2574 array = (void *)array + sz; 2575 } 2576 2577 if (type & PERF_SAMPLE_REGS_USER) { 2578 OVERFLOW_CHECK_u64(array); 2579 data->user_regs.abi = *array; 2580 array++; 2581 2582 if (data->user_regs.abi) { 2583 u64 mask = evsel->core.attr.sample_regs_user; 2584 2585 sz = hweight64(mask) * sizeof(u64); 2586 OVERFLOW_CHECK(array, sz, max_size); 2587 data->user_regs.mask = mask; 2588 data->user_regs.regs = (u64 *)array; 2589 array = (void *)array + sz; 2590 } 2591 } 2592 2593 if (type & PERF_SAMPLE_STACK_USER) { 2594 OVERFLOW_CHECK_u64(array); 2595 sz = *array++; 2596 2597 data->user_stack.offset = ((char *)(array - 1) 2598 - (char *) event); 2599 2600 if (!sz) { 2601 data->user_stack.size = 0; 2602 } else { 2603 OVERFLOW_CHECK(array, sz, max_size); 2604 data->user_stack.data = (char *)array; 2605 array = (void *)array + sz; 2606 OVERFLOW_CHECK_u64(array); 2607 data->user_stack.size = *array++; 2608 if (WARN_ONCE(data->user_stack.size > sz, 2609 "user stack dump failure\n")) 2610 return -EFAULT; 2611 } 2612 } 2613 2614 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 2615 OVERFLOW_CHECK_u64(array); 2616 arch_perf_parse_sample_weight(data, array, type); 2617 array++; 2618 } 2619 2620 if (type & PERF_SAMPLE_DATA_SRC) { 2621 OVERFLOW_CHECK_u64(array); 2622 data->data_src = *array; 2623 array++; 2624 } 2625 2626 if (type & PERF_SAMPLE_TRANSACTION) { 2627 OVERFLOW_CHECK_u64(array); 2628 data->transaction = *array; 2629 array++; 2630 } 2631 2632 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2633 if (type & PERF_SAMPLE_REGS_INTR) { 2634 OVERFLOW_CHECK_u64(array); 2635 data->intr_regs.abi = *array; 2636 array++; 2637 2638 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2639 u64 mask = evsel->core.attr.sample_regs_intr; 2640 2641 sz = hweight64(mask) * sizeof(u64); 2642 OVERFLOW_CHECK(array, sz, max_size); 2643 data->intr_regs.mask = mask; 2644 data->intr_regs.regs = (u64 *)array; 2645 array = (void *)array + sz; 2646 } 2647 } 2648 2649 data->phys_addr = 0; 2650 if (type & PERF_SAMPLE_PHYS_ADDR) { 2651 data->phys_addr = *array; 2652 array++; 2653 } 2654 2655 data->cgroup = 0; 2656 if (type & PERF_SAMPLE_CGROUP) { 2657 data->cgroup = *array; 2658 array++; 2659 } 2660 2661 data->data_page_size = 0; 2662 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 2663 data->data_page_size = *array; 2664 array++; 2665 } 2666 2667 data->code_page_size = 0; 2668 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 2669 data->code_page_size = *array; 2670 array++; 2671 } 2672 2673 if (type & PERF_SAMPLE_AUX) { 2674 OVERFLOW_CHECK_u64(array); 2675 sz = *array++; 2676 2677 OVERFLOW_CHECK(array, sz, max_size); 2678 /* Undo swap of data */ 2679 if (swapped) 2680 mem_bswap_64((char *)array, sz); 2681 data->aux_sample.size = sz; 2682 data->aux_sample.data = (char *)array; 2683 array = (void *)array + sz; 2684 } 2685 2686 return 0; 2687 } 2688 2689 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 2690 u64 *timestamp) 2691 { 2692 u64 type = evsel->core.attr.sample_type; 2693 const __u64 *array; 2694 2695 if (!(type & PERF_SAMPLE_TIME)) 2696 return -1; 2697 2698 if (event->header.type != PERF_RECORD_SAMPLE) { 2699 struct perf_sample data = { 2700 .time = -1ULL, 2701 }; 2702 2703 if (!evsel->core.attr.sample_id_all) 2704 return -1; 2705 if (perf_evsel__parse_id_sample(evsel, event, &data)) 2706 return -1; 2707 2708 *timestamp = data.time; 2709 return 0; 2710 } 2711 2712 array = event->sample.array; 2713 2714 if (perf_event__check_size(event, evsel->sample_size)) 2715 return -EFAULT; 2716 2717 if (type & PERF_SAMPLE_IDENTIFIER) 2718 array++; 2719 2720 if (type & PERF_SAMPLE_IP) 2721 array++; 2722 2723 if (type & PERF_SAMPLE_TID) 2724 array++; 2725 2726 if (type & PERF_SAMPLE_TIME) 2727 *timestamp = *array; 2728 2729 return 0; 2730 } 2731 2732 u16 evsel__id_hdr_size(struct evsel *evsel) 2733 { 2734 u64 sample_type = evsel->core.attr.sample_type; 2735 u16 size = 0; 2736 2737 if (sample_type & PERF_SAMPLE_TID) 2738 size += sizeof(u64); 2739 2740 if (sample_type & PERF_SAMPLE_TIME) 2741 size += sizeof(u64); 2742 2743 if (sample_type & PERF_SAMPLE_ID) 2744 size += sizeof(u64); 2745 2746 if (sample_type & PERF_SAMPLE_STREAM_ID) 2747 size += sizeof(u64); 2748 2749 if (sample_type & PERF_SAMPLE_CPU) 2750 size += sizeof(u64); 2751 2752 if (sample_type & PERF_SAMPLE_IDENTIFIER) 2753 size += sizeof(u64); 2754 2755 return size; 2756 } 2757 2758 #ifdef HAVE_LIBTRACEEVENT 2759 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 2760 { 2761 return tep_find_field(evsel->tp_format, name); 2762 } 2763 2764 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 2765 { 2766 struct tep_format_field *field = evsel__field(evsel, name); 2767 int offset; 2768 2769 if (!field) 2770 return NULL; 2771 2772 offset = field->offset; 2773 2774 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 2775 offset = *(int *)(sample->raw_data + field->offset); 2776 offset &= 0xffff; 2777 if (tep_field_is_relative(field->flags)) 2778 offset += field->offset + field->size; 2779 } 2780 2781 return sample->raw_data + offset; 2782 } 2783 2784 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 2785 bool needs_swap) 2786 { 2787 u64 value; 2788 void *ptr = sample->raw_data + field->offset; 2789 2790 switch (field->size) { 2791 case 1: 2792 return *(u8 *)ptr; 2793 case 2: 2794 value = *(u16 *)ptr; 2795 break; 2796 case 4: 2797 value = *(u32 *)ptr; 2798 break; 2799 case 8: 2800 memcpy(&value, ptr, sizeof(u64)); 2801 break; 2802 default: 2803 return 0; 2804 } 2805 2806 if (!needs_swap) 2807 return value; 2808 2809 switch (field->size) { 2810 case 2: 2811 return bswap_16(value); 2812 case 4: 2813 return bswap_32(value); 2814 case 8: 2815 return bswap_64(value); 2816 default: 2817 return 0; 2818 } 2819 2820 return 0; 2821 } 2822 2823 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 2824 { 2825 struct tep_format_field *field = evsel__field(evsel, name); 2826 2827 if (!field) 2828 return 0; 2829 2830 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 2831 } 2832 #endif 2833 2834 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize) 2835 { 2836 int paranoid; 2837 2838 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2839 evsel->core.attr.type == PERF_TYPE_HARDWARE && 2840 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2841 /* 2842 * If it's cycles then fall back to hrtimer based 2843 * cpu-clock-tick sw counter, which is always available even if 2844 * no PMU support. 2845 * 2846 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2847 * b0a873e). 2848 */ 2849 scnprintf(msg, msgsize, "%s", 2850 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2851 2852 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 2853 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK; 2854 2855 zfree(&evsel->name); 2856 return true; 2857 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 2858 (paranoid = perf_event_paranoid()) > 1) { 2859 const char *name = evsel__name(evsel); 2860 char *new_name; 2861 const char *sep = ":"; 2862 2863 /* If event has exclude user then don't exclude kernel. */ 2864 if (evsel->core.attr.exclude_user) 2865 return false; 2866 2867 /* Is there already the separator in the name. */ 2868 if (strchr(name, '/') || 2869 (strchr(name, ':') && !evsel->is_libpfm_event)) 2870 sep = ""; 2871 2872 if (asprintf(&new_name, "%s%su", name, sep) < 0) 2873 return false; 2874 2875 free(evsel->name); 2876 evsel->name = new_name; 2877 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 2878 "to fall back to excluding kernel and hypervisor " 2879 " samples", paranoid); 2880 evsel->core.attr.exclude_kernel = 1; 2881 evsel->core.attr.exclude_hv = 1; 2882 2883 return true; 2884 } 2885 2886 return false; 2887 } 2888 2889 static bool find_process(const char *name) 2890 { 2891 size_t len = strlen(name); 2892 DIR *dir; 2893 struct dirent *d; 2894 int ret = -1; 2895 2896 dir = opendir(procfs__mountpoint()); 2897 if (!dir) 2898 return false; 2899 2900 /* Walk through the directory. */ 2901 while (ret && (d = readdir(dir)) != NULL) { 2902 char path[PATH_MAX]; 2903 char *data; 2904 size_t size; 2905 2906 if ((d->d_type != DT_DIR) || 2907 !strcmp(".", d->d_name) || 2908 !strcmp("..", d->d_name)) 2909 continue; 2910 2911 scnprintf(path, sizeof(path), "%s/%s/comm", 2912 procfs__mountpoint(), d->d_name); 2913 2914 if (filename__read_str(path, &data, &size)) 2915 continue; 2916 2917 ret = strncmp(name, data, len); 2918 free(data); 2919 } 2920 2921 closedir(dir); 2922 return ret ? false : true; 2923 } 2924 2925 static bool is_amd(const char *arch, const char *cpuid) 2926 { 2927 return arch && !strcmp("x86", arch) && cpuid && strstarts(cpuid, "AuthenticAMD"); 2928 } 2929 2930 static bool is_amd_ibs(struct evsel *evsel) 2931 { 2932 return evsel->core.attr.precise_ip 2933 || (evsel->pmu_name && !strncmp(evsel->pmu_name, "ibs", 3)); 2934 } 2935 2936 int evsel__open_strerror(struct evsel *evsel, struct target *target, 2937 int err, char *msg, size_t size) 2938 { 2939 struct perf_env *env = evsel__env(evsel); 2940 const char *arch = perf_env__arch(env); 2941 const char *cpuid = perf_env__cpuid(env); 2942 char sbuf[STRERR_BUFSIZE]; 2943 int printed = 0, enforced = 0; 2944 2945 switch (err) { 2946 case EPERM: 2947 case EACCES: 2948 printed += scnprintf(msg + printed, size - printed, 2949 "Access to performance monitoring and observability operations is limited.\n"); 2950 2951 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 2952 if (enforced) { 2953 printed += scnprintf(msg + printed, size - printed, 2954 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 2955 "monitoring and observability operations. Inspect system audit records for\n" 2956 "more perf_event access control information and adjusting the policy.\n"); 2957 } 2958 } 2959 2960 if (err == EPERM) 2961 printed += scnprintf(msg, size, 2962 "No permission to enable %s event.\n\n", evsel__name(evsel)); 2963 2964 return scnprintf(msg + printed, size - printed, 2965 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 2966 "access to performance monitoring and observability operations for processes\n" 2967 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 2968 "More information can be found at 'Perf events and tool security' document:\n" 2969 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 2970 "perf_event_paranoid setting is %d:\n" 2971 " -1: Allow use of (almost) all events by all users\n" 2972 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 2973 ">= 0: Disallow raw and ftrace function tracepoint access\n" 2974 ">= 1: Disallow CPU event access\n" 2975 ">= 2: Disallow kernel profiling\n" 2976 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 2977 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 2978 perf_event_paranoid()); 2979 case ENOENT: 2980 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 2981 case EMFILE: 2982 return scnprintf(msg, size, "%s", 2983 "Too many events are opened.\n" 2984 "Probably the maximum number of open file descriptors has been reached.\n" 2985 "Hint: Try again after reducing the number of events.\n" 2986 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 2987 case ENOMEM: 2988 if (evsel__has_callchain(evsel) && 2989 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 2990 return scnprintf(msg, size, 2991 "Not enough memory to setup event with callchain.\n" 2992 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 2993 "Hint: Current value: %d", sysctl__max_stack()); 2994 break; 2995 case ENODEV: 2996 if (target->cpu_list) 2997 return scnprintf(msg, size, "%s", 2998 "No such device - did you specify an out-of-range profile CPU?"); 2999 break; 3000 case EOPNOTSUPP: 3001 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) 3002 return scnprintf(msg, size, 3003 "%s: PMU Hardware or event type doesn't support branch stack sampling.", 3004 evsel__name(evsel)); 3005 if (evsel->core.attr.aux_output) 3006 return scnprintf(msg, size, 3007 "%s: PMU Hardware doesn't support 'aux_output' feature", 3008 evsel__name(evsel)); 3009 if (evsel->core.attr.sample_period != 0) 3010 return scnprintf(msg, size, 3011 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 3012 evsel__name(evsel)); 3013 if (evsel->core.attr.precise_ip) 3014 return scnprintf(msg, size, "%s", 3015 "\'precise\' request may not be supported. Try removing 'p' modifier."); 3016 #if defined(__i386__) || defined(__x86_64__) 3017 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 3018 return scnprintf(msg, size, "%s", 3019 "No hardware sampling interrupt available.\n"); 3020 #endif 3021 break; 3022 case EBUSY: 3023 if (find_process("oprofiled")) 3024 return scnprintf(msg, size, 3025 "The PMU counters are busy/taken by another profiler.\n" 3026 "We found oprofile daemon running, please stop it and try again."); 3027 break; 3028 case EINVAL: 3029 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) 3030 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); 3031 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) 3032 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); 3033 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 3034 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 3035 if (perf_missing_features.clockid) 3036 return scnprintf(msg, size, "clockid feature not supported."); 3037 if (perf_missing_features.clockid_wrong) 3038 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 3039 if (perf_missing_features.aux_output) 3040 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 3041 if (!target__has_cpu(target)) 3042 return scnprintf(msg, size, 3043 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", 3044 evsel__name(evsel)); 3045 if (is_amd(arch, cpuid)) { 3046 if (is_amd_ibs(evsel)) { 3047 if (evsel->core.attr.exclude_kernel) 3048 return scnprintf(msg, size, 3049 "AMD IBS can't exclude kernel events. Try running at a higher privilege level."); 3050 if (!evsel->core.system_wide) 3051 return scnprintf(msg, size, 3052 "AMD IBS may only be available in system-wide/per-cpu mode. Try using -a, or -C and workload affinity"); 3053 } 3054 } 3055 3056 break; 3057 case ENODATA: 3058 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " 3059 "Please add an auxiliary event in front of the load latency event."); 3060 default: 3061 break; 3062 } 3063 3064 return scnprintf(msg, size, 3065 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 3066 "/bin/dmesg | grep -i perf may provide additional information.\n", 3067 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel)); 3068 } 3069 3070 struct perf_env *evsel__env(struct evsel *evsel) 3071 { 3072 if (evsel && evsel->evlist && evsel->evlist->env) 3073 return evsel->evlist->env; 3074 return &perf_env; 3075 } 3076 3077 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 3078 { 3079 int cpu_map_idx, thread; 3080 3081 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { 3082 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 3083 thread++) { 3084 int fd = FD(evsel, cpu_map_idx, thread); 3085 3086 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 3087 cpu_map_idx, thread, fd) < 0) 3088 return -1; 3089 } 3090 } 3091 3092 return 0; 3093 } 3094 3095 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 3096 { 3097 struct perf_cpu_map *cpus = evsel->core.cpus; 3098 struct perf_thread_map *threads = evsel->core.threads; 3099 3100 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr)) 3101 return -ENOMEM; 3102 3103 return store_evsel_ids(evsel, evlist); 3104 } 3105 3106 void evsel__zero_per_pkg(struct evsel *evsel) 3107 { 3108 struct hashmap_entry *cur; 3109 size_t bkt; 3110 3111 if (evsel->per_pkg_mask) { 3112 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) 3113 zfree(&cur->pkey); 3114 3115 hashmap__clear(evsel->per_pkg_mask); 3116 } 3117 } 3118 3119 /** 3120 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this 3121 * will be false on hybrid systems for hardware and legacy 3122 * cache events. 3123 */ 3124 bool evsel__is_hybrid(const struct evsel *evsel) 3125 { 3126 if (perf_pmus__num_core_pmus() == 1) 3127 return false; 3128 3129 return evsel->core.is_pmu_core; 3130 } 3131 3132 struct evsel *evsel__leader(const struct evsel *evsel) 3133 { 3134 return container_of(evsel->core.leader, struct evsel, core); 3135 } 3136 3137 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) 3138 { 3139 return evsel->core.leader == &leader->core; 3140 } 3141 3142 bool evsel__is_leader(struct evsel *evsel) 3143 { 3144 return evsel__has_leader(evsel, evsel); 3145 } 3146 3147 void evsel__set_leader(struct evsel *evsel, struct evsel *leader) 3148 { 3149 evsel->core.leader = &leader->core; 3150 } 3151 3152 int evsel__source_count(const struct evsel *evsel) 3153 { 3154 struct evsel *pos; 3155 int count = 0; 3156 3157 evlist__for_each_entry(evsel->evlist, pos) { 3158 if (pos->metric_leader == evsel) 3159 count++; 3160 } 3161 return count; 3162 } 3163 3164 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) 3165 { 3166 return false; 3167 } 3168 3169 /* 3170 * Remove an event from a given group (leader). 3171 * Some events, e.g., perf metrics Topdown events, 3172 * must always be grouped. Ignore the events. 3173 */ 3174 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) 3175 { 3176 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { 3177 evsel__set_leader(evsel, evsel); 3178 evsel->core.nr_members = 0; 3179 leader->core.nr_members--; 3180 } 3181 } 3182