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/io.h> 14 #include <api/fs/fs.h> 15 #include <api/fs/tracing_path.h> 16 #include <linux/hw_breakpoint.h> 17 #include <linux/perf_event.h> 18 #include <linux/compiler.h> 19 #include <linux/err.h> 20 #include <linux/zalloc.h> 21 #include <sys/ioctl.h> 22 #include <sys/resource.h> 23 #include <sys/types.h> 24 #include <dirent.h> 25 #include <stdlib.h> 26 #include <perf/evsel.h> 27 #include "asm/bug.h" 28 #include "bpf_counter.h" 29 #include "callchain.h" 30 #include "cgroup.h" 31 #include "counts.h" 32 #include "event.h" 33 #include "evsel.h" 34 #include "time-utils.h" 35 #include "util/env.h" 36 #include "util/evsel_config.h" 37 #include "util/evsel_fprintf.h" 38 #include "evlist.h" 39 #include <perf/cpumap.h> 40 #include "thread_map.h" 41 #include "target.h" 42 #include "perf_regs.h" 43 #include "record.h" 44 #include "debug.h" 45 #include "trace-event.h" 46 #include "stat.h" 47 #include "string2.h" 48 #include "memswap.h" 49 #include "util.h" 50 #include "util/hashmap.h" 51 #include "off_cpu.h" 52 #include "pmu.h" 53 #include "pmus.h" 54 #include "rlimit.h" 55 #include "../perf-sys.h" 56 #include "util/parse-branch-options.h" 57 #include "util/bpf-filter.h" 58 #include "util/hist.h" 59 #include <internal/xyarray.h> 60 #include <internal/lib.h> 61 #include <internal/threadmap.h> 62 #include "util/intel-tpebs.h" 63 64 #include <linux/ctype.h> 65 66 #ifdef HAVE_LIBTRACEEVENT 67 #include <traceevent/event-parse.h> 68 #endif 69 70 struct perf_missing_features perf_missing_features; 71 72 static clockid_t clockid; 73 74 static const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = { 75 NULL, 76 "duration_time", 77 "user_time", 78 "system_time", 79 }; 80 81 const char *perf_tool_event__to_str(enum perf_tool_event ev) 82 { 83 if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX) 84 return perf_tool_event__tool_names[ev]; 85 86 return NULL; 87 } 88 89 enum perf_tool_event perf_tool_event__from_str(const char *str) 90 { 91 int i; 92 93 perf_tool_event__for_each_event(i) { 94 if (!strcmp(str, perf_tool_event__tool_names[i])) 95 return i; 96 } 97 return PERF_TOOL_NONE; 98 } 99 100 101 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused) 102 { 103 return 0; 104 } 105 106 void __weak test_attr__ready(void) { } 107 108 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused) 109 { 110 } 111 112 static struct { 113 size_t size; 114 int (*init)(struct evsel *evsel); 115 void (*fini)(struct evsel *evsel); 116 } perf_evsel__object = { 117 .size = sizeof(struct evsel), 118 .init = evsel__no_extra_init, 119 .fini = evsel__no_extra_fini, 120 }; 121 122 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel), 123 void (*fini)(struct evsel *evsel)) 124 { 125 126 if (object_size == 0) 127 goto set_methods; 128 129 if (perf_evsel__object.size > object_size) 130 return -EINVAL; 131 132 perf_evsel__object.size = object_size; 133 134 set_methods: 135 if (init != NULL) 136 perf_evsel__object.init = init; 137 138 if (fini != NULL) 139 perf_evsel__object.fini = fini; 140 141 return 0; 142 } 143 144 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 145 146 int __evsel__sample_size(u64 sample_type) 147 { 148 u64 mask = sample_type & PERF_SAMPLE_MASK; 149 int size = 0; 150 int i; 151 152 for (i = 0; i < 64; i++) { 153 if (mask & (1ULL << i)) 154 size++; 155 } 156 157 size *= sizeof(u64); 158 159 return size; 160 } 161 162 /** 163 * __perf_evsel__calc_id_pos - calculate id_pos. 164 * @sample_type: sample type 165 * 166 * This function returns the position of the event id (PERF_SAMPLE_ID or 167 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 168 * perf_record_sample. 169 */ 170 static int __perf_evsel__calc_id_pos(u64 sample_type) 171 { 172 int idx = 0; 173 174 if (sample_type & PERF_SAMPLE_IDENTIFIER) 175 return 0; 176 177 if (!(sample_type & PERF_SAMPLE_ID)) 178 return -1; 179 180 if (sample_type & PERF_SAMPLE_IP) 181 idx += 1; 182 183 if (sample_type & PERF_SAMPLE_TID) 184 idx += 1; 185 186 if (sample_type & PERF_SAMPLE_TIME) 187 idx += 1; 188 189 if (sample_type & PERF_SAMPLE_ADDR) 190 idx += 1; 191 192 return idx; 193 } 194 195 /** 196 * __perf_evsel__calc_is_pos - calculate is_pos. 197 * @sample_type: sample type 198 * 199 * This function returns the position (counting backwards) of the event id 200 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 201 * sample_id_all is used there is an id sample appended to non-sample events. 202 */ 203 static int __perf_evsel__calc_is_pos(u64 sample_type) 204 { 205 int idx = 1; 206 207 if (sample_type & PERF_SAMPLE_IDENTIFIER) 208 return 1; 209 210 if (!(sample_type & PERF_SAMPLE_ID)) 211 return -1; 212 213 if (sample_type & PERF_SAMPLE_CPU) 214 idx += 1; 215 216 if (sample_type & PERF_SAMPLE_STREAM_ID) 217 idx += 1; 218 219 return idx; 220 } 221 222 void evsel__calc_id_pos(struct evsel *evsel) 223 { 224 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type); 225 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type); 226 } 227 228 void __evsel__set_sample_bit(struct evsel *evsel, 229 enum perf_event_sample_format bit) 230 { 231 if (!(evsel->core.attr.sample_type & bit)) { 232 evsel->core.attr.sample_type |= bit; 233 evsel->sample_size += sizeof(u64); 234 evsel__calc_id_pos(evsel); 235 } 236 } 237 238 void __evsel__reset_sample_bit(struct evsel *evsel, 239 enum perf_event_sample_format bit) 240 { 241 if (evsel->core.attr.sample_type & bit) { 242 evsel->core.attr.sample_type &= ~bit; 243 evsel->sample_size -= sizeof(u64); 244 evsel__calc_id_pos(evsel); 245 } 246 } 247 248 void evsel__set_sample_id(struct evsel *evsel, 249 bool can_sample_identifier) 250 { 251 if (can_sample_identifier) { 252 evsel__reset_sample_bit(evsel, ID); 253 evsel__set_sample_bit(evsel, IDENTIFIER); 254 } else { 255 evsel__set_sample_bit(evsel, ID); 256 } 257 evsel->core.attr.read_format |= PERF_FORMAT_ID; 258 } 259 260 /** 261 * evsel__is_function_event - Return whether given evsel is a function 262 * trace event 263 * 264 * @evsel - evsel selector to be tested 265 * 266 * Return %true if event is function trace event 267 */ 268 bool evsel__is_function_event(struct evsel *evsel) 269 { 270 #define FUNCTION_EVENT "ftrace:function" 271 272 return evsel->name && 273 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT)); 274 275 #undef FUNCTION_EVENT 276 } 277 278 void evsel__init(struct evsel *evsel, 279 struct perf_event_attr *attr, int idx) 280 { 281 perf_evsel__init(&evsel->core, attr, idx); 282 evsel->tracking = !idx; 283 evsel->unit = strdup(""); 284 evsel->scale = 1.0; 285 evsel->max_events = ULONG_MAX; 286 evsel->evlist = NULL; 287 evsel->bpf_obj = NULL; 288 evsel->bpf_fd = -1; 289 INIT_LIST_HEAD(&evsel->config_terms); 290 INIT_LIST_HEAD(&evsel->bpf_counter_list); 291 INIT_LIST_HEAD(&evsel->bpf_filters); 292 perf_evsel__object.init(evsel); 293 evsel->sample_size = __evsel__sample_size(attr->sample_type); 294 evsel__calc_id_pos(evsel); 295 evsel->cmdline_group_boundary = false; 296 evsel->metric_events = NULL; 297 evsel->per_pkg_mask = NULL; 298 evsel->collect_stat = false; 299 evsel->pmu_name = NULL; 300 evsel->group_pmu_name = NULL; 301 evsel->skippable = false; 302 } 303 304 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 305 { 306 struct evsel *evsel = zalloc(perf_evsel__object.size); 307 308 if (!evsel) 309 return NULL; 310 evsel__init(evsel, attr, idx); 311 312 if (evsel__is_bpf_output(evsel) && !attr->sample_type) { 313 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 314 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 315 evsel->core.attr.sample_period = 1; 316 } 317 318 if (evsel__is_clock(evsel)) { 319 free((char *)evsel->unit); 320 evsel->unit = strdup("msec"); 321 evsel->scale = 1e-6; 322 } 323 324 return evsel; 325 } 326 327 int copy_config_terms(struct list_head *dst, struct list_head *src) 328 { 329 struct evsel_config_term *pos, *tmp; 330 331 list_for_each_entry(pos, src, list) { 332 tmp = malloc(sizeof(*tmp)); 333 if (tmp == NULL) 334 return -ENOMEM; 335 336 *tmp = *pos; 337 if (tmp->free_str) { 338 tmp->val.str = strdup(pos->val.str); 339 if (tmp->val.str == NULL) { 340 free(tmp); 341 return -ENOMEM; 342 } 343 } 344 list_add_tail(&tmp->list, dst); 345 } 346 return 0; 347 } 348 349 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src) 350 { 351 return copy_config_terms(&dst->config_terms, &src->config_terms); 352 } 353 354 /** 355 * evsel__clone - create a new evsel copied from @orig 356 * @orig: original evsel 357 * 358 * The assumption is that @orig is not configured nor opened yet. 359 * So we only care about the attributes that can be set while it's parsed. 360 */ 361 struct evsel *evsel__clone(struct evsel *orig) 362 { 363 struct evsel *evsel; 364 365 BUG_ON(orig->core.fd); 366 BUG_ON(orig->counts); 367 BUG_ON(orig->priv); 368 BUG_ON(orig->per_pkg_mask); 369 370 /* cannot handle BPF objects for now */ 371 if (orig->bpf_obj) 372 return NULL; 373 374 evsel = evsel__new(&orig->core.attr); 375 if (evsel == NULL) 376 return NULL; 377 378 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus); 379 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus); 380 evsel->core.threads = perf_thread_map__get(orig->core.threads); 381 evsel->core.nr_members = orig->core.nr_members; 382 evsel->core.system_wide = orig->core.system_wide; 383 evsel->core.requires_cpu = orig->core.requires_cpu; 384 evsel->core.is_pmu_core = orig->core.is_pmu_core; 385 386 if (orig->name) { 387 evsel->name = strdup(orig->name); 388 if (evsel->name == NULL) 389 goto out_err; 390 } 391 if (orig->group_name) { 392 evsel->group_name = strdup(orig->group_name); 393 if (evsel->group_name == NULL) 394 goto out_err; 395 } 396 if (orig->pmu_name) { 397 evsel->pmu_name = strdup(orig->pmu_name); 398 if (evsel->pmu_name == NULL) 399 goto out_err; 400 } 401 if (orig->group_pmu_name) { 402 evsel->group_pmu_name = strdup(orig->group_pmu_name); 403 if (evsel->group_pmu_name == NULL) 404 goto out_err; 405 } 406 if (orig->filter) { 407 evsel->filter = strdup(orig->filter); 408 if (evsel->filter == NULL) 409 goto out_err; 410 } 411 if (orig->metric_id) { 412 evsel->metric_id = strdup(orig->metric_id); 413 if (evsel->metric_id == NULL) 414 goto out_err; 415 } 416 evsel->cgrp = cgroup__get(orig->cgrp); 417 #ifdef HAVE_LIBTRACEEVENT 418 evsel->tp_format = orig->tp_format; 419 #endif 420 evsel->handler = orig->handler; 421 evsel->core.leader = orig->core.leader; 422 423 evsel->max_events = orig->max_events; 424 evsel->tool_event = orig->tool_event; 425 free((char *)evsel->unit); 426 evsel->unit = strdup(orig->unit); 427 if (evsel->unit == NULL) 428 goto out_err; 429 430 evsel->scale = orig->scale; 431 evsel->snapshot = orig->snapshot; 432 evsel->per_pkg = orig->per_pkg; 433 evsel->percore = orig->percore; 434 evsel->precise_max = orig->precise_max; 435 evsel->is_libpfm_event = orig->is_libpfm_event; 436 437 evsel->exclude_GH = orig->exclude_GH; 438 evsel->sample_read = orig->sample_read; 439 evsel->auto_merge_stats = orig->auto_merge_stats; 440 evsel->collect_stat = orig->collect_stat; 441 evsel->weak_group = orig->weak_group; 442 evsel->use_config_name = orig->use_config_name; 443 evsel->pmu = orig->pmu; 444 445 if (evsel__copy_config_terms(evsel, orig) < 0) 446 goto out_err; 447 448 return evsel; 449 450 out_err: 451 evsel__delete(evsel); 452 return NULL; 453 } 454 455 /* 456 * Returns pointer with encoded error via <linux/err.h> interface. 457 */ 458 #ifdef HAVE_LIBTRACEEVENT 459 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx, bool format) 460 { 461 struct evsel *evsel = zalloc(perf_evsel__object.size); 462 int err = -ENOMEM; 463 464 if (evsel == NULL) { 465 goto out_err; 466 } else { 467 struct perf_event_attr attr = { 468 .type = PERF_TYPE_TRACEPOINT, 469 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 470 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 471 }; 472 473 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 474 goto out_free; 475 476 event_attr_init(&attr); 477 478 if (format) { 479 evsel->tp_format = trace_event__tp_format(sys, name); 480 if (IS_ERR(evsel->tp_format)) { 481 err = PTR_ERR(evsel->tp_format); 482 goto out_free; 483 } 484 attr.config = evsel->tp_format->id; 485 } else { 486 attr.config = (__u64) -1; 487 } 488 489 490 attr.sample_period = 1; 491 evsel__init(evsel, &attr, idx); 492 } 493 494 return evsel; 495 496 out_free: 497 zfree(&evsel->name); 498 free(evsel); 499 out_err: 500 return ERR_PTR(err); 501 } 502 #endif 503 504 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = { 505 "cycles", 506 "instructions", 507 "cache-references", 508 "cache-misses", 509 "branches", 510 "branch-misses", 511 "bus-cycles", 512 "stalled-cycles-frontend", 513 "stalled-cycles-backend", 514 "ref-cycles", 515 }; 516 517 char *evsel__bpf_counter_events; 518 519 bool evsel__match_bpf_counter_events(const char *name) 520 { 521 int name_len; 522 bool match; 523 char *ptr; 524 525 if (!evsel__bpf_counter_events) 526 return false; 527 528 ptr = strstr(evsel__bpf_counter_events, name); 529 name_len = strlen(name); 530 531 /* check name matches a full token in evsel__bpf_counter_events */ 532 match = (ptr != NULL) && 533 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) && 534 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0')); 535 536 return match; 537 } 538 539 static const char *__evsel__hw_name(u64 config) 540 { 541 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 542 return evsel__hw_names[config]; 543 544 return "unknown-hardware"; 545 } 546 547 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 548 { 549 int colon = 0, r = 0; 550 struct perf_event_attr *attr = &evsel->core.attr; 551 bool exclude_guest_default = false; 552 553 #define MOD_PRINT(context, mod) do { \ 554 if (!attr->exclude_##context) { \ 555 if (!colon) colon = ++r; \ 556 r += scnprintf(bf + r, size - r, "%c", mod); \ 557 } } while(0) 558 559 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 560 MOD_PRINT(kernel, 'k'); 561 MOD_PRINT(user, 'u'); 562 MOD_PRINT(hv, 'h'); 563 exclude_guest_default = true; 564 } 565 566 if (attr->precise_ip) { 567 if (!colon) 568 colon = ++r; 569 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 570 exclude_guest_default = true; 571 } 572 573 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 574 MOD_PRINT(host, 'H'); 575 MOD_PRINT(guest, 'G'); 576 } 577 #undef MOD_PRINT 578 if (colon) 579 bf[colon - 1] = ':'; 580 return r; 581 } 582 583 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 584 { 585 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 586 } 587 588 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 589 { 590 int r = arch_evsel__hw_name(evsel, bf, size); 591 return r + evsel__add_modifiers(evsel, bf + r, size - r); 592 } 593 594 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = { 595 "cpu-clock", 596 "task-clock", 597 "page-faults", 598 "context-switches", 599 "cpu-migrations", 600 "minor-faults", 601 "major-faults", 602 "alignment-faults", 603 "emulation-faults", 604 "dummy", 605 }; 606 607 static const char *__evsel__sw_name(u64 config) 608 { 609 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 610 return evsel__sw_names[config]; 611 return "unknown-software"; 612 } 613 614 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 615 { 616 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 617 return r + evsel__add_modifiers(evsel, bf + r, size - r); 618 } 619 620 static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size) 621 { 622 return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev)); 623 } 624 625 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 626 { 627 int r; 628 629 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 630 631 if (type & HW_BREAKPOINT_R) 632 r += scnprintf(bf + r, size - r, "r"); 633 634 if (type & HW_BREAKPOINT_W) 635 r += scnprintf(bf + r, size - r, "w"); 636 637 if (type & HW_BREAKPOINT_X) 638 r += scnprintf(bf + r, size - r, "x"); 639 640 return r; 641 } 642 643 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 644 { 645 struct perf_event_attr *attr = &evsel->core.attr; 646 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 647 return r + evsel__add_modifiers(evsel, bf + r, size - r); 648 } 649 650 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 651 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 652 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 653 { "LLC", "L2", }, 654 { "dTLB", "d-tlb", "Data-TLB", }, 655 { "iTLB", "i-tlb", "Instruction-TLB", }, 656 { "branch", "branches", "bpu", "btb", "bpc", }, 657 { "node", }, 658 }; 659 660 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 661 { "load", "loads", "read", }, 662 { "store", "stores", "write", }, 663 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 664 }; 665 666 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 667 { "refs", "Reference", "ops", "access", }, 668 { "misses", "miss", }, 669 }; 670 671 #define C(x) PERF_COUNT_HW_CACHE_##x 672 #define CACHE_READ (1 << C(OP_READ)) 673 #define CACHE_WRITE (1 << C(OP_WRITE)) 674 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 675 #define COP(x) (1 << x) 676 677 /* 678 * cache operation stat 679 * L1I : Read and prefetch only 680 * ITLB and BPU : Read-only 681 */ 682 static const unsigned long evsel__hw_cache_stat[C(MAX)] = { 683 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 684 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 685 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 686 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 687 [C(ITLB)] = (CACHE_READ), 688 [C(BPU)] = (CACHE_READ), 689 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 690 }; 691 692 bool evsel__is_cache_op_valid(u8 type, u8 op) 693 { 694 if (evsel__hw_cache_stat[type] & COP(op)) 695 return true; /* valid */ 696 else 697 return false; /* invalid */ 698 } 699 700 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 701 { 702 if (result) { 703 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 704 evsel__hw_cache_op[op][0], 705 evsel__hw_cache_result[result][0]); 706 } 707 708 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 709 evsel__hw_cache_op[op][1]); 710 } 711 712 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 713 { 714 u8 op, result, type = (config >> 0) & 0xff; 715 const char *err = "unknown-ext-hardware-cache-type"; 716 717 if (type >= PERF_COUNT_HW_CACHE_MAX) 718 goto out_err; 719 720 op = (config >> 8) & 0xff; 721 err = "unknown-ext-hardware-cache-op"; 722 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 723 goto out_err; 724 725 result = (config >> 16) & 0xff; 726 err = "unknown-ext-hardware-cache-result"; 727 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 728 goto out_err; 729 730 err = "invalid-cache"; 731 if (!evsel__is_cache_op_valid(type, op)) 732 goto out_err; 733 734 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 735 out_err: 736 return scnprintf(bf, size, "%s", err); 737 } 738 739 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 740 { 741 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 742 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 743 } 744 745 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 746 { 747 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 748 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret); 749 } 750 751 const char *evsel__name(struct evsel *evsel) 752 { 753 char bf[128]; 754 755 if (!evsel) 756 goto out_unknown; 757 758 if (evsel->name) 759 return evsel->name; 760 761 switch (evsel->core.attr.type) { 762 case PERF_TYPE_RAW: 763 evsel__raw_name(evsel, bf, sizeof(bf)); 764 break; 765 766 case PERF_TYPE_HARDWARE: 767 evsel__hw_name(evsel, bf, sizeof(bf)); 768 break; 769 770 case PERF_TYPE_HW_CACHE: 771 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 772 break; 773 774 case PERF_TYPE_SOFTWARE: 775 if (evsel__is_tool(evsel)) 776 evsel__tool_name(evsel__tool_event(evsel), bf, sizeof(bf)); 777 else 778 evsel__sw_name(evsel, bf, sizeof(bf)); 779 break; 780 781 case PERF_TYPE_TRACEPOINT: 782 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 783 break; 784 785 case PERF_TYPE_BREAKPOINT: 786 evsel__bp_name(evsel, bf, sizeof(bf)); 787 break; 788 789 default: 790 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 791 evsel->core.attr.type); 792 break; 793 } 794 795 evsel->name = strdup(bf); 796 797 if (evsel->name) 798 return evsel->name; 799 out_unknown: 800 return "unknown"; 801 } 802 803 bool evsel__name_is(struct evsel *evsel, const char *name) 804 { 805 return !strcmp(evsel__name(evsel), name); 806 } 807 808 const char *evsel__metric_id(const struct evsel *evsel) 809 { 810 if (evsel->metric_id) 811 return evsel->metric_id; 812 813 if (evsel__is_tool(evsel)) 814 return perf_tool_event__to_str(evsel__tool_event(evsel)); 815 816 return "unknown"; 817 } 818 819 const char *evsel__group_name(struct evsel *evsel) 820 { 821 return evsel->group_name ?: "anon group"; 822 } 823 824 /* 825 * Returns the group details for the specified leader, 826 * with following rules. 827 * 828 * For record -e '{cycles,instructions}' 829 * 'anon group { cycles:u, instructions:u }' 830 * 831 * For record -e 'cycles,instructions' and report --group 832 * 'cycles:u, instructions:u' 833 */ 834 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 835 { 836 int ret = 0; 837 bool first = true; 838 struct evsel *pos; 839 const char *group_name = evsel__group_name(evsel); 840 841 if (!evsel->forced_leader) 842 ret = scnprintf(buf, size, "%s { ", group_name); 843 844 for_each_group_evsel(pos, evsel) { 845 if (symbol_conf.skip_empty && 846 evsel__hists(pos)->stats.nr_samples == 0) 847 continue; 848 849 ret += scnprintf(buf + ret, size - ret, "%s%s", 850 first ? "" : ", ", evsel__name(pos)); 851 first = false; 852 } 853 854 if (!evsel->forced_leader) 855 ret += scnprintf(buf + ret, size - ret, " }"); 856 857 return ret; 858 } 859 860 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 861 struct callchain_param *param) 862 { 863 bool function = evsel__is_function_event(evsel); 864 struct perf_event_attr *attr = &evsel->core.attr; 865 const char *arch = perf_env__arch(evsel__env(evsel)); 866 867 evsel__set_sample_bit(evsel, CALLCHAIN); 868 869 attr->sample_max_stack = param->max_stack; 870 871 if (opts->kernel_callchains) 872 attr->exclude_callchain_user = 1; 873 if (opts->user_callchains) 874 attr->exclude_callchain_kernel = 1; 875 if (param->record_mode == CALLCHAIN_LBR) { 876 if (!opts->branch_stack) { 877 if (attr->exclude_user) { 878 pr_warning("LBR callstack option is only available " 879 "to get user callchain information. " 880 "Falling back to framepointers.\n"); 881 } else { 882 evsel__set_sample_bit(evsel, BRANCH_STACK); 883 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 884 PERF_SAMPLE_BRANCH_CALL_STACK | 885 PERF_SAMPLE_BRANCH_NO_CYCLES | 886 PERF_SAMPLE_BRANCH_NO_FLAGS | 887 PERF_SAMPLE_BRANCH_HW_INDEX; 888 } 889 } else 890 pr_warning("Cannot use LBR callstack with branch stack. " 891 "Falling back to framepointers.\n"); 892 } 893 894 if (param->record_mode == CALLCHAIN_DWARF) { 895 if (!function) { 896 evsel__set_sample_bit(evsel, REGS_USER); 897 evsel__set_sample_bit(evsel, STACK_USER); 898 if (opts->sample_user_regs && 899 DWARF_MINIMAL_REGS(arch) != arch__user_reg_mask()) { 900 attr->sample_regs_user |= DWARF_MINIMAL_REGS(arch); 901 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 902 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 903 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 904 } else { 905 attr->sample_regs_user |= arch__user_reg_mask(); 906 } 907 attr->sample_stack_user = param->dump_size; 908 attr->exclude_callchain_user = 1; 909 } else { 910 pr_info("Cannot use DWARF unwind for function trace event," 911 " falling back to framepointers.\n"); 912 } 913 } 914 915 if (function) { 916 pr_info("Disabling user space callchains for function trace event.\n"); 917 attr->exclude_callchain_user = 1; 918 } 919 } 920 921 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 922 struct callchain_param *param) 923 { 924 if (param->enabled) 925 return __evsel__config_callchain(evsel, opts, param); 926 } 927 928 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param) 929 { 930 struct perf_event_attr *attr = &evsel->core.attr; 931 932 evsel__reset_sample_bit(evsel, CALLCHAIN); 933 if (param->record_mode == CALLCHAIN_LBR) { 934 evsel__reset_sample_bit(evsel, BRANCH_STACK); 935 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 936 PERF_SAMPLE_BRANCH_CALL_STACK | 937 PERF_SAMPLE_BRANCH_HW_INDEX); 938 } 939 if (param->record_mode == CALLCHAIN_DWARF) { 940 evsel__reset_sample_bit(evsel, REGS_USER); 941 evsel__reset_sample_bit(evsel, STACK_USER); 942 } 943 } 944 945 static void evsel__apply_config_terms(struct evsel *evsel, 946 struct record_opts *opts, bool track) 947 { 948 struct evsel_config_term *term; 949 struct list_head *config_terms = &evsel->config_terms; 950 struct perf_event_attr *attr = &evsel->core.attr; 951 /* callgraph default */ 952 struct callchain_param param = { 953 .record_mode = callchain_param.record_mode, 954 }; 955 u32 dump_size = 0; 956 int max_stack = 0; 957 const char *callgraph_buf = NULL; 958 959 list_for_each_entry(term, config_terms, list) { 960 switch (term->type) { 961 case EVSEL__CONFIG_TERM_PERIOD: 962 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 963 attr->sample_period = term->val.period; 964 attr->freq = 0; 965 evsel__reset_sample_bit(evsel, PERIOD); 966 } 967 break; 968 case EVSEL__CONFIG_TERM_FREQ: 969 if (!(term->weak && opts->user_freq != UINT_MAX)) { 970 attr->sample_freq = term->val.freq; 971 attr->freq = 1; 972 evsel__set_sample_bit(evsel, PERIOD); 973 } 974 break; 975 case EVSEL__CONFIG_TERM_TIME: 976 if (term->val.time) 977 evsel__set_sample_bit(evsel, TIME); 978 else 979 evsel__reset_sample_bit(evsel, TIME); 980 break; 981 case EVSEL__CONFIG_TERM_CALLGRAPH: 982 callgraph_buf = term->val.str; 983 break; 984 case EVSEL__CONFIG_TERM_BRANCH: 985 if (term->val.str && strcmp(term->val.str, "no")) { 986 evsel__set_sample_bit(evsel, BRANCH_STACK); 987 parse_branch_str(term->val.str, 988 &attr->branch_sample_type); 989 } else 990 evsel__reset_sample_bit(evsel, BRANCH_STACK); 991 break; 992 case EVSEL__CONFIG_TERM_STACK_USER: 993 dump_size = term->val.stack_user; 994 break; 995 case EVSEL__CONFIG_TERM_MAX_STACK: 996 max_stack = term->val.max_stack; 997 break; 998 case EVSEL__CONFIG_TERM_MAX_EVENTS: 999 evsel->max_events = term->val.max_events; 1000 break; 1001 case EVSEL__CONFIG_TERM_INHERIT: 1002 /* 1003 * attr->inherit should has already been set by 1004 * evsel__config. If user explicitly set 1005 * inherit using config terms, override global 1006 * opt->no_inherit setting. 1007 */ 1008 attr->inherit = term->val.inherit ? 1 : 0; 1009 break; 1010 case EVSEL__CONFIG_TERM_OVERWRITE: 1011 attr->write_backward = term->val.overwrite ? 1 : 0; 1012 break; 1013 case EVSEL__CONFIG_TERM_DRV_CFG: 1014 break; 1015 case EVSEL__CONFIG_TERM_PERCORE: 1016 break; 1017 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 1018 attr->aux_output = term->val.aux_output ? 1 : 0; 1019 break; 1020 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 1021 /* Already applied by auxtrace */ 1022 break; 1023 case EVSEL__CONFIG_TERM_CFG_CHG: 1024 break; 1025 default: 1026 break; 1027 } 1028 } 1029 1030 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 1031 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 1032 bool sample_address = false; 1033 1034 if (max_stack) { 1035 param.max_stack = max_stack; 1036 if (callgraph_buf == NULL) 1037 callgraph_buf = "fp"; 1038 } 1039 1040 /* parse callgraph parameters */ 1041 if (callgraph_buf != NULL) { 1042 if (!strcmp(callgraph_buf, "no")) { 1043 param.enabled = false; 1044 param.record_mode = CALLCHAIN_NONE; 1045 } else { 1046 param.enabled = true; 1047 if (parse_callchain_record(callgraph_buf, ¶m)) { 1048 pr_err("per-event callgraph setting for %s failed. " 1049 "Apply callgraph global setting for it\n", 1050 evsel->name); 1051 return; 1052 } 1053 if (param.record_mode == CALLCHAIN_DWARF) 1054 sample_address = true; 1055 } 1056 } 1057 if (dump_size > 0) { 1058 dump_size = round_up(dump_size, sizeof(u64)); 1059 param.dump_size = dump_size; 1060 } 1061 1062 /* If global callgraph set, clear it */ 1063 if (callchain_param.enabled) 1064 evsel__reset_callgraph(evsel, &callchain_param); 1065 1066 /* set perf-event callgraph */ 1067 if (param.enabled) { 1068 if (sample_address) { 1069 evsel__set_sample_bit(evsel, ADDR); 1070 evsel__set_sample_bit(evsel, DATA_SRC); 1071 evsel->core.attr.mmap_data = track; 1072 } 1073 evsel__config_callchain(evsel, opts, ¶m); 1074 } 1075 } 1076 } 1077 1078 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 1079 { 1080 struct evsel_config_term *term, *found_term = NULL; 1081 1082 list_for_each_entry(term, &evsel->config_terms, list) { 1083 if (term->type == type) 1084 found_term = term; 1085 } 1086 1087 return found_term; 1088 } 1089 1090 void __weak arch_evsel__set_sample_weight(struct evsel *evsel) 1091 { 1092 evsel__set_sample_bit(evsel, WEIGHT); 1093 } 1094 1095 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused, 1096 struct perf_event_attr *attr __maybe_unused) 1097 { 1098 } 1099 1100 static void evsel__set_default_freq_period(struct record_opts *opts, 1101 struct perf_event_attr *attr) 1102 { 1103 if (opts->freq) { 1104 attr->freq = 1; 1105 attr->sample_freq = opts->freq; 1106 } else { 1107 attr->sample_period = opts->default_interval; 1108 } 1109 } 1110 1111 static bool evsel__is_offcpu_event(struct evsel *evsel) 1112 { 1113 return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT); 1114 } 1115 1116 /* 1117 * The enable_on_exec/disabled value strategy: 1118 * 1119 * 1) For any type of traced program: 1120 * - all independent events and group leaders are disabled 1121 * - all group members are enabled 1122 * 1123 * Group members are ruled by group leaders. They need to 1124 * be enabled, because the group scheduling relies on that. 1125 * 1126 * 2) For traced programs executed by perf: 1127 * - all independent events and group leaders have 1128 * enable_on_exec set 1129 * - we don't specifically enable or disable any event during 1130 * the record command 1131 * 1132 * Independent events and group leaders are initially disabled 1133 * and get enabled by exec. Group members are ruled by group 1134 * leaders as stated in 1). 1135 * 1136 * 3) For traced programs attached by perf (pid/tid): 1137 * - we specifically enable or disable all events during 1138 * the record command 1139 * 1140 * When attaching events to already running traced we 1141 * enable/disable events specifically, as there's no 1142 * initial traced exec call. 1143 */ 1144 void evsel__config(struct evsel *evsel, struct record_opts *opts, 1145 struct callchain_param *callchain) 1146 { 1147 struct evsel *leader = evsel__leader(evsel); 1148 struct perf_event_attr *attr = &evsel->core.attr; 1149 int track = evsel->tracking; 1150 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 1151 1152 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 1153 attr->inherit = !opts->no_inherit; 1154 attr->write_backward = opts->overwrite ? 1 : 0; 1155 attr->read_format = PERF_FORMAT_LOST; 1156 1157 evsel__set_sample_bit(evsel, IP); 1158 evsel__set_sample_bit(evsel, TID); 1159 1160 if (evsel->sample_read) { 1161 evsel__set_sample_bit(evsel, READ); 1162 1163 /* 1164 * We need ID even in case of single event, because 1165 * PERF_SAMPLE_READ process ID specific data. 1166 */ 1167 evsel__set_sample_id(evsel, false); 1168 1169 /* 1170 * Apply group format only if we belong to group 1171 * with more than one members. 1172 */ 1173 if (leader->core.nr_members > 1) { 1174 attr->read_format |= PERF_FORMAT_GROUP; 1175 attr->inherit = 0; 1176 } 1177 } 1178 1179 /* 1180 * We default some events to have a default interval. But keep 1181 * it a weak assumption overridable by the user. 1182 */ 1183 if ((evsel->is_libpfm_event && !attr->sample_period) || 1184 (!evsel->is_libpfm_event && (!attr->sample_period || 1185 opts->user_freq != UINT_MAX || 1186 opts->user_interval != ULLONG_MAX))) 1187 evsel__set_default_freq_period(opts, attr); 1188 1189 /* 1190 * If attr->freq was set (here or earlier), ask for period 1191 * to be sampled. 1192 */ 1193 if (attr->freq) 1194 evsel__set_sample_bit(evsel, PERIOD); 1195 1196 if (opts->no_samples) 1197 attr->sample_freq = 0; 1198 1199 if (opts->inherit_stat) { 1200 evsel->core.attr.read_format |= 1201 PERF_FORMAT_TOTAL_TIME_ENABLED | 1202 PERF_FORMAT_TOTAL_TIME_RUNNING | 1203 PERF_FORMAT_ID; 1204 attr->inherit_stat = 1; 1205 } 1206 1207 if (opts->sample_address) { 1208 evsel__set_sample_bit(evsel, ADDR); 1209 attr->mmap_data = track; 1210 } 1211 1212 /* 1213 * We don't allow user space callchains for function trace 1214 * event, due to issues with page faults while tracing page 1215 * fault handler and its overall trickiness nature. 1216 */ 1217 if (evsel__is_function_event(evsel)) 1218 evsel->core.attr.exclude_callchain_user = 1; 1219 1220 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1221 evsel__config_callchain(evsel, opts, callchain); 1222 1223 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1224 !evsel__is_dummy_event(evsel)) { 1225 attr->sample_regs_intr = opts->sample_intr_regs; 1226 evsel__set_sample_bit(evsel, REGS_INTR); 1227 } 1228 1229 if (opts->sample_user_regs && !evsel->no_aux_samples && 1230 !evsel__is_dummy_event(evsel)) { 1231 attr->sample_regs_user |= opts->sample_user_regs; 1232 evsel__set_sample_bit(evsel, REGS_USER); 1233 } 1234 1235 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1236 evsel__set_sample_bit(evsel, CPU); 1237 1238 /* 1239 * When the user explicitly disabled time don't force it here. 1240 */ 1241 if (opts->sample_time && 1242 (!perf_missing_features.sample_id_all && 1243 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1244 opts->sample_time_set))) 1245 evsel__set_sample_bit(evsel, TIME); 1246 1247 if (opts->raw_samples && !evsel->no_aux_samples) { 1248 evsel__set_sample_bit(evsel, TIME); 1249 evsel__set_sample_bit(evsel, RAW); 1250 evsel__set_sample_bit(evsel, CPU); 1251 } 1252 1253 if (opts->sample_address) 1254 evsel__set_sample_bit(evsel, DATA_SRC); 1255 1256 if (opts->sample_phys_addr) 1257 evsel__set_sample_bit(evsel, PHYS_ADDR); 1258 1259 if (opts->no_buffering) { 1260 attr->watermark = 0; 1261 attr->wakeup_events = 1; 1262 } 1263 if (opts->branch_stack && !evsel->no_aux_samples) { 1264 evsel__set_sample_bit(evsel, BRANCH_STACK); 1265 attr->branch_sample_type = opts->branch_stack; 1266 } 1267 1268 if (opts->sample_weight) 1269 arch_evsel__set_sample_weight(evsel); 1270 1271 attr->task = track; 1272 attr->mmap = track; 1273 attr->mmap2 = track && !perf_missing_features.mmap2; 1274 attr->comm = track; 1275 attr->build_id = track && opts->build_id; 1276 1277 /* 1278 * ksymbol is tracked separately with text poke because it needs to be 1279 * system wide and enabled immediately. 1280 */ 1281 if (!opts->text_poke) 1282 attr->ksymbol = track && !perf_missing_features.ksymbol; 1283 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1284 1285 if (opts->record_namespaces) 1286 attr->namespaces = track; 1287 1288 if (opts->record_cgroup) { 1289 attr->cgroup = track && !perf_missing_features.cgroup; 1290 evsel__set_sample_bit(evsel, CGROUP); 1291 } 1292 1293 if (opts->sample_data_page_size) 1294 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE); 1295 1296 if (opts->sample_code_page_size) 1297 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE); 1298 1299 if (opts->record_switch_events) 1300 attr->context_switch = track; 1301 1302 if (opts->sample_transaction) 1303 evsel__set_sample_bit(evsel, TRANSACTION); 1304 1305 if (opts->running_time) { 1306 evsel->core.attr.read_format |= 1307 PERF_FORMAT_TOTAL_TIME_ENABLED | 1308 PERF_FORMAT_TOTAL_TIME_RUNNING; 1309 } 1310 1311 /* 1312 * XXX see the function comment above 1313 * 1314 * Disabling only independent events or group leaders, 1315 * keeping group members enabled. 1316 */ 1317 if (evsel__is_group_leader(evsel)) 1318 attr->disabled = 1; 1319 1320 /* 1321 * Setting enable_on_exec for independent events and 1322 * group leaders for traced executed by perf. 1323 */ 1324 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1325 !opts->target.initial_delay) 1326 attr->enable_on_exec = 1; 1327 1328 if (evsel->immediate) { 1329 attr->disabled = 0; 1330 attr->enable_on_exec = 0; 1331 } 1332 1333 clockid = opts->clockid; 1334 if (opts->use_clockid) { 1335 attr->use_clockid = 1; 1336 attr->clockid = opts->clockid; 1337 } 1338 1339 if (evsel->precise_max) 1340 attr->precise_ip = 3; 1341 1342 if (opts->all_user) { 1343 attr->exclude_kernel = 1; 1344 attr->exclude_user = 0; 1345 } 1346 1347 if (opts->all_kernel) { 1348 attr->exclude_kernel = 0; 1349 attr->exclude_user = 1; 1350 } 1351 1352 if (evsel->core.own_cpus || evsel->unit) 1353 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1354 1355 /* 1356 * Apply event specific term settings, 1357 * it overloads any global configuration. 1358 */ 1359 evsel__apply_config_terms(evsel, opts, track); 1360 1361 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1362 1363 /* The --period option takes the precedence. */ 1364 if (opts->period_set) { 1365 if (opts->period) 1366 evsel__set_sample_bit(evsel, PERIOD); 1367 else 1368 evsel__reset_sample_bit(evsel, PERIOD); 1369 } 1370 1371 /* 1372 * A dummy event never triggers any actual counter and therefore 1373 * cannot be used with branch_stack. 1374 * 1375 * For initial_delay, a dummy event is added implicitly. 1376 * The software event will trigger -EOPNOTSUPP error out, 1377 * if BRANCH_STACK bit is set. 1378 */ 1379 if (evsel__is_dummy_event(evsel)) 1380 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1381 1382 if (evsel__is_offcpu_event(evsel)) 1383 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES; 1384 1385 arch__post_evsel_config(evsel, attr); 1386 } 1387 1388 int evsel__set_filter(struct evsel *evsel, const char *filter) 1389 { 1390 char *new_filter = strdup(filter); 1391 1392 if (new_filter != NULL) { 1393 free(evsel->filter); 1394 evsel->filter = new_filter; 1395 return 0; 1396 } 1397 1398 return -1; 1399 } 1400 1401 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1402 { 1403 char *new_filter; 1404 1405 if (evsel->filter == NULL) 1406 return evsel__set_filter(evsel, filter); 1407 1408 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1409 free(evsel->filter); 1410 evsel->filter = new_filter; 1411 return 0; 1412 } 1413 1414 return -1; 1415 } 1416 1417 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1418 { 1419 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1420 } 1421 1422 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1423 { 1424 return evsel__append_filter(evsel, "%s,%s", filter); 1425 } 1426 1427 /* Caller has to clear disabled after going through all CPUs. */ 1428 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx) 1429 { 1430 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx); 1431 } 1432 1433 int evsel__enable(struct evsel *evsel) 1434 { 1435 int err = perf_evsel__enable(&evsel->core); 1436 1437 if (!err) 1438 evsel->disabled = false; 1439 return err; 1440 } 1441 1442 /* Caller has to set disabled after going through all CPUs. */ 1443 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx) 1444 { 1445 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx); 1446 } 1447 1448 int evsel__disable(struct evsel *evsel) 1449 { 1450 int err = perf_evsel__disable(&evsel->core); 1451 /* 1452 * We mark it disabled here so that tools that disable a event can 1453 * ignore events after they disable it. I.e. the ring buffer may have 1454 * already a few more events queued up before the kernel got the stop 1455 * request. 1456 */ 1457 if (!err) 1458 evsel->disabled = true; 1459 1460 return err; 1461 } 1462 1463 void free_config_terms(struct list_head *config_terms) 1464 { 1465 struct evsel_config_term *term, *h; 1466 1467 list_for_each_entry_safe(term, h, config_terms, list) { 1468 list_del_init(&term->list); 1469 if (term->free_str) 1470 zfree(&term->val.str); 1471 free(term); 1472 } 1473 } 1474 1475 static void evsel__free_config_terms(struct evsel *evsel) 1476 { 1477 free_config_terms(&evsel->config_terms); 1478 } 1479 1480 void evsel__exit(struct evsel *evsel) 1481 { 1482 assert(list_empty(&evsel->core.node)); 1483 assert(evsel->evlist == NULL); 1484 bpf_counter__destroy(evsel); 1485 perf_bpf_filter__destroy(evsel); 1486 evsel__free_counts(evsel); 1487 perf_evsel__free_fd(&evsel->core); 1488 perf_evsel__free_id(&evsel->core); 1489 evsel__free_config_terms(evsel); 1490 cgroup__put(evsel->cgrp); 1491 perf_cpu_map__put(evsel->core.cpus); 1492 perf_cpu_map__put(evsel->core.own_cpus); 1493 perf_thread_map__put(evsel->core.threads); 1494 zfree(&evsel->group_name); 1495 zfree(&evsel->name); 1496 zfree(&evsel->filter); 1497 zfree(&evsel->pmu_name); 1498 zfree(&evsel->group_pmu_name); 1499 zfree(&evsel->unit); 1500 zfree(&evsel->metric_id); 1501 evsel__zero_per_pkg(evsel); 1502 hashmap__free(evsel->per_pkg_mask); 1503 evsel->per_pkg_mask = NULL; 1504 zfree(&evsel->metric_events); 1505 perf_evsel__object.fini(evsel); 1506 if (evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME || 1507 evsel__tool_event(evsel) == PERF_TOOL_USER_TIME) 1508 xyarray__delete(evsel->start_times); 1509 } 1510 1511 void evsel__delete(struct evsel *evsel) 1512 { 1513 if (!evsel) 1514 return; 1515 1516 evsel__exit(evsel); 1517 free(evsel); 1518 } 1519 1520 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread, 1521 struct perf_counts_values *count) 1522 { 1523 struct perf_counts_values tmp; 1524 1525 if (!evsel->prev_raw_counts) 1526 return; 1527 1528 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread); 1529 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count; 1530 1531 count->val = count->val - tmp.val; 1532 count->ena = count->ena - tmp.ena; 1533 count->run = count->run - tmp.run; 1534 } 1535 1536 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread) 1537 { 1538 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread); 1539 1540 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count); 1541 } 1542 1543 static int evsel__read_retire_lat(struct evsel *evsel, int cpu_map_idx, int thread) 1544 { 1545 return tpebs_set_evsel(evsel, cpu_map_idx, thread); 1546 } 1547 1548 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread, 1549 u64 val, u64 ena, u64 run, u64 lost) 1550 { 1551 struct perf_counts_values *count; 1552 1553 count = perf_counts(counter->counts, cpu_map_idx, thread); 1554 1555 if (counter->retire_lat) { 1556 evsel__read_retire_lat(counter, cpu_map_idx, thread); 1557 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1558 return; 1559 } 1560 1561 count->val = val; 1562 count->ena = ena; 1563 count->run = run; 1564 count->lost = lost; 1565 1566 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true); 1567 } 1568 1569 static bool evsel__group_has_tpebs(struct evsel *leader) 1570 { 1571 struct evsel *evsel; 1572 1573 for_each_group_evsel(evsel, leader) { 1574 if (evsel__is_retire_lat(evsel)) 1575 return true; 1576 } 1577 return false; 1578 } 1579 1580 static u64 evsel__group_read_nr_members(struct evsel *leader) 1581 { 1582 u64 nr = leader->core.nr_members; 1583 struct evsel *evsel; 1584 1585 for_each_group_evsel(evsel, leader) { 1586 if (evsel__is_retire_lat(evsel)) 1587 nr--; 1588 } 1589 return nr; 1590 } 1591 1592 static u64 evsel__group_read_size(struct evsel *leader) 1593 { 1594 u64 read_format = leader->core.attr.read_format; 1595 int entry = sizeof(u64); /* value */ 1596 int size = 0; 1597 int nr = 1; 1598 1599 if (!evsel__group_has_tpebs(leader)) 1600 return perf_evsel__read_size(&leader->core); 1601 1602 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1603 size += sizeof(u64); 1604 1605 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1606 size += sizeof(u64); 1607 1608 if (read_format & PERF_FORMAT_ID) 1609 entry += sizeof(u64); 1610 1611 if (read_format & PERF_FORMAT_LOST) 1612 entry += sizeof(u64); 1613 1614 if (read_format & PERF_FORMAT_GROUP) { 1615 nr = evsel__group_read_nr_members(leader); 1616 size += sizeof(u64); 1617 } 1618 1619 size += entry * nr; 1620 return size; 1621 } 1622 1623 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data) 1624 { 1625 u64 read_format = leader->core.attr.read_format; 1626 struct sample_read_value *v; 1627 u64 nr, ena = 0, run = 0, lost = 0; 1628 1629 nr = *data++; 1630 1631 if (nr != evsel__group_read_nr_members(leader)) 1632 return -EINVAL; 1633 1634 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1635 ena = *data++; 1636 1637 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1638 run = *data++; 1639 1640 v = (void *)data; 1641 sample_read_group__for_each(v, nr, read_format) { 1642 struct evsel *counter; 1643 1644 counter = evlist__id2evsel(leader->evlist, v->id); 1645 if (!counter) 1646 return -EINVAL; 1647 1648 if (read_format & PERF_FORMAT_LOST) 1649 lost = v->lost; 1650 1651 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost); 1652 } 1653 1654 return 0; 1655 } 1656 1657 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread) 1658 { 1659 struct perf_stat_evsel *ps = leader->stats; 1660 u64 read_format = leader->core.attr.read_format; 1661 int size = evsel__group_read_size(leader); 1662 u64 *data = ps->group_data; 1663 1664 if (!(read_format & PERF_FORMAT_ID)) 1665 return -EINVAL; 1666 1667 if (!evsel__is_group_leader(leader)) 1668 return -EINVAL; 1669 1670 if (!data) { 1671 data = zalloc(size); 1672 if (!data) 1673 return -ENOMEM; 1674 1675 ps->group_data = data; 1676 } 1677 1678 if (FD(leader, cpu_map_idx, thread) < 0) 1679 return -EINVAL; 1680 1681 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0) 1682 return -errno; 1683 1684 return evsel__process_group_data(leader, cpu_map_idx, thread, data); 1685 } 1686 1687 static bool read_until_char(struct io *io, char e) 1688 { 1689 int c; 1690 1691 do { 1692 c = io__get_char(io); 1693 if (c == -1) 1694 return false; 1695 } while (c != e); 1696 return true; 1697 } 1698 1699 static int read_stat_field(int fd, struct perf_cpu cpu, int field, __u64 *val) 1700 { 1701 char buf[256]; 1702 struct io io; 1703 int i; 1704 1705 io__init(&io, fd, buf, sizeof(buf)); 1706 1707 /* Skip lines to relevant CPU. */ 1708 for (i = -1; i < cpu.cpu; i++) { 1709 if (!read_until_char(&io, '\n')) 1710 return -EINVAL; 1711 } 1712 /* Skip to "cpu". */ 1713 if (io__get_char(&io) != 'c') return -EINVAL; 1714 if (io__get_char(&io) != 'p') return -EINVAL; 1715 if (io__get_char(&io) != 'u') return -EINVAL; 1716 1717 /* Skip N of cpuN. */ 1718 if (!read_until_char(&io, ' ')) 1719 return -EINVAL; 1720 1721 i = 1; 1722 while (true) { 1723 if (io__get_dec(&io, val) != ' ') 1724 break; 1725 if (field == i) 1726 return 0; 1727 i++; 1728 } 1729 return -EINVAL; 1730 } 1731 1732 static int read_pid_stat_field(int fd, int field, __u64 *val) 1733 { 1734 char buf[256]; 1735 struct io io; 1736 int c, i; 1737 1738 io__init(&io, fd, buf, sizeof(buf)); 1739 if (io__get_dec(&io, val) != ' ') 1740 return -EINVAL; 1741 if (field == 1) 1742 return 0; 1743 1744 /* Skip comm. */ 1745 if (io__get_char(&io) != '(' || !read_until_char(&io, ')')) 1746 return -EINVAL; 1747 if (field == 2) 1748 return -EINVAL; /* String can't be returned. */ 1749 1750 /* Skip state */ 1751 if (io__get_char(&io) != ' ' || io__get_char(&io) == -1) 1752 return -EINVAL; 1753 if (field == 3) 1754 return -EINVAL; /* String can't be returned. */ 1755 1756 /* Loop over numeric fields*/ 1757 if (io__get_char(&io) != ' ') 1758 return -EINVAL; 1759 1760 i = 4; 1761 while (true) { 1762 c = io__get_dec(&io, val); 1763 if (c == -1) 1764 return -EINVAL; 1765 if (c == -2) { 1766 /* Assume a -ve was read */ 1767 c = io__get_dec(&io, val); 1768 *val *= -1; 1769 } 1770 if (c != ' ') 1771 return -EINVAL; 1772 if (field == i) 1773 return 0; 1774 i++; 1775 } 1776 return -EINVAL; 1777 } 1778 1779 static int evsel__read_tool(struct evsel *evsel, int cpu_map_idx, int thread) 1780 { 1781 __u64 *start_time, cur_time, delta_start; 1782 int fd, err = 0; 1783 struct perf_counts_values *count; 1784 bool adjust = false; 1785 1786 count = perf_counts(evsel->counts, cpu_map_idx, thread); 1787 1788 switch (evsel__tool_event(evsel)) { 1789 case PERF_TOOL_DURATION_TIME: 1790 /* 1791 * Pretend duration_time is only on the first CPU and thread, or 1792 * else aggregation will scale duration_time by the number of 1793 * CPUs/threads. 1794 */ 1795 start_time = &evsel->start_time; 1796 if (cpu_map_idx == 0 && thread == 0) 1797 cur_time = rdclock(); 1798 else 1799 cur_time = *start_time; 1800 break; 1801 case PERF_TOOL_USER_TIME: 1802 case PERF_TOOL_SYSTEM_TIME: { 1803 bool system = evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME; 1804 1805 start_time = xyarray__entry(evsel->start_times, cpu_map_idx, thread); 1806 fd = FD(evsel, cpu_map_idx, thread); 1807 lseek(fd, SEEK_SET, 0); 1808 if (evsel->pid_stat) { 1809 /* The event exists solely on 1 CPU. */ 1810 if (cpu_map_idx == 0) 1811 err = read_pid_stat_field(fd, system ? 15 : 14, &cur_time); 1812 else 1813 cur_time = 0; 1814 } else { 1815 /* The event is for all threads. */ 1816 if (thread == 0) { 1817 struct perf_cpu cpu = perf_cpu_map__cpu(evsel->core.cpus, 1818 cpu_map_idx); 1819 1820 err = read_stat_field(fd, cpu, system ? 3 : 1, &cur_time); 1821 } else { 1822 cur_time = 0; 1823 } 1824 } 1825 adjust = true; 1826 break; 1827 } 1828 case PERF_TOOL_NONE: 1829 case PERF_TOOL_MAX: 1830 default: 1831 err = -EINVAL; 1832 } 1833 if (err) 1834 return err; 1835 1836 delta_start = cur_time - *start_time; 1837 if (adjust) { 1838 __u64 ticks_per_sec = sysconf(_SC_CLK_TCK); 1839 1840 delta_start *= 1000000000 / ticks_per_sec; 1841 } 1842 count->val = delta_start; 1843 count->ena = count->run = delta_start; 1844 count->lost = 0; 1845 return 0; 1846 } 1847 1848 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread) 1849 { 1850 if (evsel__is_tool(evsel)) 1851 return evsel__read_tool(evsel, cpu_map_idx, thread); 1852 1853 if (evsel__is_retire_lat(evsel)) 1854 return evsel__read_retire_lat(evsel, cpu_map_idx, thread); 1855 1856 if (evsel->core.attr.read_format & PERF_FORMAT_GROUP) 1857 return evsel__read_group(evsel, cpu_map_idx, thread); 1858 1859 return evsel__read_one(evsel, cpu_map_idx, thread); 1860 } 1861 1862 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale) 1863 { 1864 struct perf_counts_values count; 1865 size_t nv = scale ? 3 : 1; 1866 1867 if (FD(evsel, cpu_map_idx, thread) < 0) 1868 return -EINVAL; 1869 1870 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0) 1871 return -ENOMEM; 1872 1873 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0) 1874 return -errno; 1875 1876 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count); 1877 perf_counts_values__scale(&count, scale, NULL); 1878 *perf_counts(evsel->counts, cpu_map_idx, thread) = count; 1879 return 0; 1880 } 1881 1882 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other, 1883 int cpu_map_idx) 1884 { 1885 struct perf_cpu cpu; 1886 1887 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx); 1888 return perf_cpu_map__idx(other->core.cpus, cpu); 1889 } 1890 1891 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx) 1892 { 1893 struct evsel *leader = evsel__leader(evsel); 1894 1895 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) || 1896 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) { 1897 return evsel__match_other_cpu(evsel, leader, cpu_map_idx); 1898 } 1899 1900 return cpu_map_idx; 1901 } 1902 1903 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread) 1904 { 1905 struct evsel *leader = evsel__leader(evsel); 1906 int fd; 1907 1908 if (evsel__is_group_leader(evsel)) 1909 return -1; 1910 1911 /* 1912 * Leader must be already processed/open, 1913 * if not it's a bug. 1914 */ 1915 BUG_ON(!leader->core.fd); 1916 1917 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx); 1918 if (cpu_map_idx == -1) 1919 return -1; 1920 1921 fd = FD(leader, cpu_map_idx, thread); 1922 BUG_ON(fd == -1 && !leader->skippable); 1923 1924 /* 1925 * When the leader has been skipped, return -2 to distinguish from no 1926 * group leader case. 1927 */ 1928 return fd == -1 ? -2 : fd; 1929 } 1930 1931 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx) 1932 { 1933 for (int cpu = 0; cpu < nr_cpus; cpu++) 1934 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1935 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1936 } 1937 1938 static int update_fds(struct evsel *evsel, 1939 int nr_cpus, int cpu_map_idx, 1940 int nr_threads, int thread_idx) 1941 { 1942 struct evsel *pos; 1943 1944 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads) 1945 return -EINVAL; 1946 1947 evlist__for_each_entry(evsel->evlist, pos) { 1948 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx; 1949 1950 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1951 1952 /* 1953 * Since fds for next evsel has not been created, 1954 * there is no need to iterate whole event list. 1955 */ 1956 if (pos == evsel) 1957 break; 1958 } 1959 return 0; 1960 } 1961 1962 static bool evsel__ignore_missing_thread(struct evsel *evsel, 1963 int nr_cpus, int cpu_map_idx, 1964 struct perf_thread_map *threads, 1965 int thread, int err) 1966 { 1967 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1968 1969 if (!evsel->ignore_missing_thread) 1970 return false; 1971 1972 /* The system wide setup does not work with threads. */ 1973 if (evsel->core.system_wide) 1974 return false; 1975 1976 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1977 if (err != -ESRCH) 1978 return false; 1979 1980 /* If there's only one thread, let it fail. */ 1981 if (threads->nr == 1) 1982 return false; 1983 1984 /* 1985 * We should remove fd for missing_thread first 1986 * because thread_map__remove() will decrease threads->nr. 1987 */ 1988 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread)) 1989 return false; 1990 1991 if (thread_map__remove(threads, thread)) 1992 return false; 1993 1994 pr_warning("WARNING: Ignored open failure for pid %d\n", 1995 ignore_pid); 1996 return true; 1997 } 1998 1999 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 2000 void *priv __maybe_unused) 2001 { 2002 return fprintf(fp, " %-32s %s\n", name, val); 2003 } 2004 2005 static void display_attr(struct perf_event_attr *attr) 2006 { 2007 if (verbose >= 2 || debug_peo_args) { 2008 fprintf(stderr, "%.60s\n", graph_dotted_line); 2009 fprintf(stderr, "perf_event_attr:\n"); 2010 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 2011 fprintf(stderr, "%.60s\n", graph_dotted_line); 2012 } 2013 } 2014 2015 bool evsel__precise_ip_fallback(struct evsel *evsel) 2016 { 2017 /* Do not try less precise if not requested. */ 2018 if (!evsel->precise_max) 2019 return false; 2020 2021 /* 2022 * We tried all the precise_ip values, and it's 2023 * still failing, so leave it to standard fallback. 2024 */ 2025 if (!evsel->core.attr.precise_ip) { 2026 evsel->core.attr.precise_ip = evsel->precise_ip_original; 2027 return false; 2028 } 2029 2030 if (!evsel->precise_ip_original) 2031 evsel->precise_ip_original = evsel->core.attr.precise_ip; 2032 2033 evsel->core.attr.precise_ip--; 2034 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 2035 display_attr(&evsel->core.attr); 2036 return true; 2037 } 2038 2039 static struct perf_cpu_map *empty_cpu_map; 2040 static struct perf_thread_map *empty_thread_map; 2041 2042 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 2043 struct perf_thread_map *threads) 2044 { 2045 int nthreads = perf_thread_map__nr(threads); 2046 2047 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 2048 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 2049 return -EINVAL; 2050 2051 if (cpus == NULL) { 2052 if (empty_cpu_map == NULL) { 2053 empty_cpu_map = perf_cpu_map__new_any_cpu(); 2054 if (empty_cpu_map == NULL) 2055 return -ENOMEM; 2056 } 2057 2058 cpus = empty_cpu_map; 2059 } 2060 2061 if (threads == NULL) { 2062 if (empty_thread_map == NULL) { 2063 empty_thread_map = thread_map__new_by_tid(-1); 2064 if (empty_thread_map == NULL) 2065 return -ENOMEM; 2066 } 2067 2068 threads = empty_thread_map; 2069 } 2070 2071 if (evsel->core.fd == NULL && 2072 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0) 2073 return -ENOMEM; 2074 2075 if ((evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME || 2076 evsel__tool_event(evsel) == PERF_TOOL_USER_TIME) && 2077 !evsel->start_times) { 2078 evsel->start_times = xyarray__new(perf_cpu_map__nr(cpus), nthreads, sizeof(__u64)); 2079 if (!evsel->start_times) 2080 return -ENOMEM; 2081 } 2082 2083 evsel->open_flags = PERF_FLAG_FD_CLOEXEC; 2084 if (evsel->cgrp) 2085 evsel->open_flags |= PERF_FLAG_PID_CGROUP; 2086 2087 return 0; 2088 } 2089 2090 static void evsel__disable_missing_features(struct evsel *evsel) 2091 { 2092 if (perf_missing_features.branch_counters) 2093 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS; 2094 if (perf_missing_features.read_lost) 2095 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST; 2096 if (perf_missing_features.weight_struct) { 2097 evsel__set_sample_bit(evsel, WEIGHT); 2098 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT); 2099 } 2100 if (perf_missing_features.clockid_wrong) 2101 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 2102 if (perf_missing_features.clockid) { 2103 evsel->core.attr.use_clockid = 0; 2104 evsel->core.attr.clockid = 0; 2105 } 2106 if (perf_missing_features.cloexec) 2107 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 2108 if (perf_missing_features.mmap2) 2109 evsel->core.attr.mmap2 = 0; 2110 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest) 2111 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 2112 if (perf_missing_features.lbr_flags) 2113 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 2114 PERF_SAMPLE_BRANCH_NO_CYCLES); 2115 if (perf_missing_features.group_read && evsel->core.attr.inherit) 2116 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 2117 if (perf_missing_features.ksymbol) 2118 evsel->core.attr.ksymbol = 0; 2119 if (perf_missing_features.bpf) 2120 evsel->core.attr.bpf_event = 0; 2121 if (perf_missing_features.branch_hw_idx) 2122 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX; 2123 if (perf_missing_features.sample_id_all) 2124 evsel->core.attr.sample_id_all = 0; 2125 } 2126 2127 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, 2128 struct perf_thread_map *threads) 2129 { 2130 int err; 2131 2132 err = __evsel__prepare_open(evsel, cpus, threads); 2133 if (err) 2134 return err; 2135 2136 evsel__disable_missing_features(evsel); 2137 2138 return err; 2139 } 2140 2141 bool evsel__detect_missing_features(struct evsel *evsel) 2142 { 2143 /* 2144 * Must probe features in the order they were added to the 2145 * perf_event_attr interface. 2146 */ 2147 if (!perf_missing_features.branch_counters && 2148 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS)) { 2149 perf_missing_features.branch_counters = true; 2150 pr_debug2("switching off branch counters support\n"); 2151 return true; 2152 } else if (!perf_missing_features.read_lost && 2153 (evsel->core.attr.read_format & PERF_FORMAT_LOST)) { 2154 perf_missing_features.read_lost = true; 2155 pr_debug2("switching off PERF_FORMAT_LOST support\n"); 2156 return true; 2157 } else if (!perf_missing_features.weight_struct && 2158 (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { 2159 perf_missing_features.weight_struct = true; 2160 pr_debug2("switching off weight struct support\n"); 2161 return true; 2162 } else if (!perf_missing_features.code_page_size && 2163 (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { 2164 perf_missing_features.code_page_size = true; 2165 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); 2166 return false; 2167 } else if (!perf_missing_features.data_page_size && 2168 (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { 2169 perf_missing_features.data_page_size = true; 2170 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); 2171 return false; 2172 } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { 2173 perf_missing_features.cgroup = true; 2174 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); 2175 return false; 2176 } else if (!perf_missing_features.branch_hw_idx && 2177 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { 2178 perf_missing_features.branch_hw_idx = true; 2179 pr_debug2("switching off branch HW index support\n"); 2180 return true; 2181 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 2182 perf_missing_features.aux_output = true; 2183 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); 2184 return false; 2185 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 2186 perf_missing_features.bpf = true; 2187 pr_debug2_peo("switching off bpf_event\n"); 2188 return true; 2189 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 2190 perf_missing_features.ksymbol = true; 2191 pr_debug2_peo("switching off ksymbol\n"); 2192 return true; 2193 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 2194 perf_missing_features.write_backward = true; 2195 pr_debug2_peo("switching off write_backward\n"); 2196 return false; 2197 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 2198 perf_missing_features.clockid_wrong = true; 2199 pr_debug2_peo("switching off clockid\n"); 2200 return true; 2201 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 2202 perf_missing_features.clockid = true; 2203 pr_debug2_peo("switching off use_clockid\n"); 2204 return true; 2205 } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { 2206 perf_missing_features.cloexec = true; 2207 pr_debug2_peo("switching off cloexec flag\n"); 2208 return true; 2209 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 2210 perf_missing_features.mmap2 = true; 2211 pr_debug2_peo("switching off mmap2\n"); 2212 return true; 2213 } else if (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) { 2214 if (evsel->pmu == NULL) 2215 evsel->pmu = evsel__find_pmu(evsel); 2216 2217 if (evsel->pmu) 2218 evsel->pmu->missing_features.exclude_guest = true; 2219 else { 2220 /* we cannot find PMU, disable attrs now */ 2221 evsel->core.attr.exclude_host = false; 2222 evsel->core.attr.exclude_guest = false; 2223 } 2224 2225 if (evsel->exclude_GH) { 2226 pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n"); 2227 return false; 2228 } 2229 if (!perf_missing_features.exclude_guest) { 2230 perf_missing_features.exclude_guest = true; 2231 pr_debug2_peo("switching off exclude_guest, exclude_host\n"); 2232 } 2233 return true; 2234 } else if (!perf_missing_features.sample_id_all) { 2235 perf_missing_features.sample_id_all = true; 2236 pr_debug2_peo("switching off sample_id_all\n"); 2237 return true; 2238 } else if (!perf_missing_features.lbr_flags && 2239 (evsel->core.attr.branch_sample_type & 2240 (PERF_SAMPLE_BRANCH_NO_CYCLES | 2241 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 2242 perf_missing_features.lbr_flags = true; 2243 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 2244 return true; 2245 } else if (!perf_missing_features.group_read && 2246 evsel->core.attr.inherit && 2247 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 2248 evsel__is_group_leader(evsel)) { 2249 perf_missing_features.group_read = true; 2250 pr_debug2_peo("switching off group read\n"); 2251 return true; 2252 } else { 2253 return false; 2254 } 2255 } 2256 2257 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 2258 struct perf_thread_map *threads, 2259 int start_cpu_map_idx, int end_cpu_map_idx) 2260 { 2261 int idx, thread, nthreads; 2262 int pid = -1, err, old_errno; 2263 enum rlimit_action set_rlimit = NO_CHANGE; 2264 2265 if (evsel__tool_event(evsel) == PERF_TOOL_DURATION_TIME) { 2266 if (evsel->core.attr.sample_period) /* no sampling */ 2267 return -EINVAL; 2268 evsel->start_time = rdclock(); 2269 return 0; 2270 } 2271 2272 if (evsel__is_retire_lat(evsel)) 2273 return tpebs_start(evsel->evlist); 2274 2275 err = __evsel__prepare_open(evsel, cpus, threads); 2276 if (err) 2277 return err; 2278 2279 if (cpus == NULL) 2280 cpus = empty_cpu_map; 2281 2282 if (threads == NULL) 2283 threads = empty_thread_map; 2284 2285 nthreads = perf_thread_map__nr(threads); 2286 2287 if (evsel->cgrp) 2288 pid = evsel->cgrp->fd; 2289 2290 fallback_missing_features: 2291 evsel__disable_missing_features(evsel); 2292 2293 pr_debug3("Opening: %s\n", evsel__name(evsel)); 2294 display_attr(&evsel->core.attr); 2295 2296 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) { 2297 2298 for (thread = 0; thread < nthreads; thread++) { 2299 int fd, group_fd; 2300 retry_open: 2301 if (thread >= nthreads) 2302 break; 2303 2304 if (!evsel->cgrp && !evsel->core.system_wide) 2305 pid = perf_thread_map__pid(threads, thread); 2306 2307 if (evsel__tool_event(evsel) == PERF_TOOL_USER_TIME || 2308 evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME) { 2309 bool system = evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME; 2310 __u64 *start_time = NULL; 2311 2312 if (evsel->core.attr.sample_period) { 2313 /* no sampling */ 2314 err = -EINVAL; 2315 goto out_close; 2316 } 2317 if (pid > -1) { 2318 char buf[64]; 2319 2320 snprintf(buf, sizeof(buf), "/proc/%d/stat", pid); 2321 fd = open(buf, O_RDONLY); 2322 evsel->pid_stat = true; 2323 } else { 2324 fd = open("/proc/stat", O_RDONLY); 2325 } 2326 FD(evsel, idx, thread) = fd; 2327 if (fd < 0) { 2328 err = -errno; 2329 goto out_close; 2330 } 2331 start_time = xyarray__entry(evsel->start_times, idx, thread); 2332 if (pid > -1) { 2333 err = read_pid_stat_field(fd, system ? 15 : 14, 2334 start_time); 2335 } else { 2336 struct perf_cpu cpu; 2337 2338 cpu = perf_cpu_map__cpu(evsel->core.cpus, idx); 2339 err = read_stat_field(fd, cpu, system ? 3 : 1, 2340 start_time); 2341 } 2342 if (err) 2343 goto out_close; 2344 continue; 2345 } 2346 2347 group_fd = get_group_fd(evsel, idx, thread); 2348 2349 if (group_fd == -2) { 2350 pr_debug("broken group leader for %s\n", evsel->name); 2351 err = -EINVAL; 2352 goto out_close; 2353 } 2354 2355 test_attr__ready(); 2356 2357 /* Debug message used by test scripts */ 2358 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 2359 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags); 2360 2361 fd = sys_perf_event_open(&evsel->core.attr, pid, 2362 perf_cpu_map__cpu(cpus, idx).cpu, 2363 group_fd, evsel->open_flags); 2364 2365 FD(evsel, idx, thread) = fd; 2366 2367 if (fd < 0) { 2368 err = -errno; 2369 2370 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 2371 err); 2372 goto try_fallback; 2373 } 2374 2375 bpf_counter__install_pe(evsel, idx, fd); 2376 2377 if (unlikely(test_attr__enabled)) { 2378 test_attr__open(&evsel->core.attr, pid, 2379 perf_cpu_map__cpu(cpus, idx), 2380 fd, group_fd, evsel->open_flags); 2381 } 2382 2383 /* Debug message used by test scripts */ 2384 pr_debug2_peo(" = %d\n", fd); 2385 2386 if (evsel->bpf_fd >= 0) { 2387 int evt_fd = fd; 2388 int bpf_fd = evsel->bpf_fd; 2389 2390 err = ioctl(evt_fd, 2391 PERF_EVENT_IOC_SET_BPF, 2392 bpf_fd); 2393 if (err && errno != EEXIST) { 2394 pr_err("failed to attach bpf fd %d: %s\n", 2395 bpf_fd, strerror(errno)); 2396 err = -EINVAL; 2397 goto out_close; 2398 } 2399 } 2400 2401 set_rlimit = NO_CHANGE; 2402 2403 /* 2404 * If we succeeded but had to kill clockid, fail and 2405 * have evsel__open_strerror() print us a nice error. 2406 */ 2407 if (perf_missing_features.clockid || 2408 perf_missing_features.clockid_wrong) { 2409 err = -EINVAL; 2410 goto out_close; 2411 } 2412 } 2413 } 2414 2415 return 0; 2416 2417 try_fallback: 2418 if (evsel__precise_ip_fallback(evsel)) 2419 goto retry_open; 2420 2421 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus), 2422 idx, threads, thread, err)) { 2423 /* We just removed 1 thread, so lower the upper nthreads limit. */ 2424 nthreads--; 2425 2426 /* ... and pretend like nothing have happened. */ 2427 err = 0; 2428 goto retry_open; 2429 } 2430 /* 2431 * perf stat needs between 5 and 22 fds per CPU. When we run out 2432 * of them try to increase the limits. 2433 */ 2434 if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit)) 2435 goto retry_open; 2436 2437 if (err != -EINVAL || idx > 0 || thread > 0) 2438 goto out_close; 2439 2440 if (evsel__detect_missing_features(evsel)) 2441 goto fallback_missing_features; 2442 out_close: 2443 if (err) 2444 threads->err_thread = thread; 2445 2446 old_errno = errno; 2447 do { 2448 while (--thread >= 0) { 2449 if (FD(evsel, idx, thread) >= 0) 2450 close(FD(evsel, idx, thread)); 2451 FD(evsel, idx, thread) = -1; 2452 } 2453 thread = nthreads; 2454 } while (--idx >= 0); 2455 errno = old_errno; 2456 return err; 2457 } 2458 2459 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 2460 struct perf_thread_map *threads) 2461 { 2462 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus)); 2463 } 2464 2465 void evsel__close(struct evsel *evsel) 2466 { 2467 if (evsel__is_retire_lat(evsel)) 2468 tpebs_delete(); 2469 perf_evsel__close(&evsel->core); 2470 perf_evsel__free_id(&evsel->core); 2471 } 2472 2473 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx) 2474 { 2475 if (cpu_map_idx == -1) 2476 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus)); 2477 2478 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1); 2479 } 2480 2481 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 2482 { 2483 return evsel__open(evsel, NULL, threads); 2484 } 2485 2486 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 2487 const union perf_event *event, 2488 struct perf_sample *sample) 2489 { 2490 u64 type = evsel->core.attr.sample_type; 2491 const __u64 *array = event->sample.array; 2492 bool swapped = evsel->needs_swap; 2493 union u64_swap u; 2494 2495 array += ((event->header.size - 2496 sizeof(event->header)) / sizeof(u64)) - 1; 2497 2498 if (type & PERF_SAMPLE_IDENTIFIER) { 2499 sample->id = *array; 2500 array--; 2501 } 2502 2503 if (type & PERF_SAMPLE_CPU) { 2504 u.val64 = *array; 2505 if (swapped) { 2506 /* undo swap of u64, then swap on individual u32s */ 2507 u.val64 = bswap_64(u.val64); 2508 u.val32[0] = bswap_32(u.val32[0]); 2509 } 2510 2511 sample->cpu = u.val32[0]; 2512 array--; 2513 } 2514 2515 if (type & PERF_SAMPLE_STREAM_ID) { 2516 sample->stream_id = *array; 2517 array--; 2518 } 2519 2520 if (type & PERF_SAMPLE_ID) { 2521 sample->id = *array; 2522 array--; 2523 } 2524 2525 if (type & PERF_SAMPLE_TIME) { 2526 sample->time = *array; 2527 array--; 2528 } 2529 2530 if (type & PERF_SAMPLE_TID) { 2531 u.val64 = *array; 2532 if (swapped) { 2533 /* undo swap of u64, then swap on individual u32s */ 2534 u.val64 = bswap_64(u.val64); 2535 u.val32[0] = bswap_32(u.val32[0]); 2536 u.val32[1] = bswap_32(u.val32[1]); 2537 } 2538 2539 sample->pid = u.val32[0]; 2540 sample->tid = u.val32[1]; 2541 array--; 2542 } 2543 2544 return 0; 2545 } 2546 2547 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 2548 u64 size) 2549 { 2550 return size > max_size || offset + size > endp; 2551 } 2552 2553 #define OVERFLOW_CHECK(offset, size, max_size) \ 2554 do { \ 2555 if (overflow(endp, (max_size), (offset), (size))) \ 2556 return -EFAULT; \ 2557 } while (0) 2558 2559 #define OVERFLOW_CHECK_u64(offset) \ 2560 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 2561 2562 static int 2563 perf_event__check_size(union perf_event *event, unsigned int sample_size) 2564 { 2565 /* 2566 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 2567 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 2568 * check the format does not go past the end of the event. 2569 */ 2570 if (sample_size + sizeof(event->header) > event->header.size) 2571 return -EFAULT; 2572 2573 return 0; 2574 } 2575 2576 void __weak arch_perf_parse_sample_weight(struct perf_sample *data, 2577 const __u64 *array, 2578 u64 type __maybe_unused) 2579 { 2580 data->weight = *array; 2581 } 2582 2583 u64 evsel__bitfield_swap_branch_flags(u64 value) 2584 { 2585 u64 new_val = 0; 2586 2587 /* 2588 * branch_flags 2589 * union { 2590 * u64 values; 2591 * struct { 2592 * mispred:1 //target mispredicted 2593 * predicted:1 //target predicted 2594 * in_tx:1 //in transaction 2595 * abort:1 //transaction abort 2596 * cycles:16 //cycle count to last branch 2597 * type:4 //branch type 2598 * spec:2 //branch speculation info 2599 * new_type:4 //additional branch type 2600 * priv:3 //privilege level 2601 * reserved:31 2602 * } 2603 * } 2604 * 2605 * Avoid bswap64() the entire branch_flag.value, 2606 * as it has variable bit-field sizes. Instead the 2607 * macro takes the bit-field position/size, 2608 * swaps it based on the host endianness. 2609 */ 2610 if (host_is_bigendian()) { 2611 new_val = bitfield_swap(value, 0, 1); 2612 new_val |= bitfield_swap(value, 1, 1); 2613 new_val |= bitfield_swap(value, 2, 1); 2614 new_val |= bitfield_swap(value, 3, 1); 2615 new_val |= bitfield_swap(value, 4, 16); 2616 new_val |= bitfield_swap(value, 20, 4); 2617 new_val |= bitfield_swap(value, 24, 2); 2618 new_val |= bitfield_swap(value, 26, 4); 2619 new_val |= bitfield_swap(value, 30, 3); 2620 new_val |= bitfield_swap(value, 33, 31); 2621 } else { 2622 new_val = bitfield_swap(value, 63, 1); 2623 new_val |= bitfield_swap(value, 62, 1); 2624 new_val |= bitfield_swap(value, 61, 1); 2625 new_val |= bitfield_swap(value, 60, 1); 2626 new_val |= bitfield_swap(value, 44, 16); 2627 new_val |= bitfield_swap(value, 40, 4); 2628 new_val |= bitfield_swap(value, 38, 2); 2629 new_val |= bitfield_swap(value, 34, 4); 2630 new_val |= bitfield_swap(value, 31, 3); 2631 new_val |= bitfield_swap(value, 0, 31); 2632 } 2633 2634 return new_val; 2635 } 2636 2637 static inline bool evsel__has_branch_counters(const struct evsel *evsel) 2638 { 2639 struct evsel *leader = evsel__leader(evsel); 2640 2641 /* The branch counters feature only supports group */ 2642 if (!leader || !evsel->evlist) 2643 return false; 2644 2645 if (evsel->evlist->nr_br_cntr < 0) 2646 evlist__update_br_cntr(evsel->evlist); 2647 2648 if (leader->br_cntr_nr > 0) 2649 return true; 2650 2651 return false; 2652 } 2653 2654 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 2655 struct perf_sample *data) 2656 { 2657 u64 type = evsel->core.attr.sample_type; 2658 bool swapped = evsel->needs_swap; 2659 const __u64 *array; 2660 u16 max_size = event->header.size; 2661 const void *endp = (void *)event + max_size; 2662 u64 sz; 2663 2664 /* 2665 * used for cross-endian analysis. See git commit 65014ab3 2666 * for why this goofiness is needed. 2667 */ 2668 union u64_swap u; 2669 2670 memset(data, 0, sizeof(*data)); 2671 data->cpu = data->pid = data->tid = -1; 2672 data->stream_id = data->id = data->time = -1ULL; 2673 data->period = evsel->core.attr.sample_period; 2674 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 2675 data->misc = event->header.misc; 2676 data->data_src = PERF_MEM_DATA_SRC_NONE; 2677 data->vcpu = -1; 2678 2679 if (event->header.type != PERF_RECORD_SAMPLE) { 2680 if (!evsel->core.attr.sample_id_all) 2681 return 0; 2682 return perf_evsel__parse_id_sample(evsel, event, data); 2683 } 2684 2685 array = event->sample.array; 2686 2687 if (perf_event__check_size(event, evsel->sample_size)) 2688 return -EFAULT; 2689 2690 if (type & PERF_SAMPLE_IDENTIFIER) { 2691 data->id = *array; 2692 array++; 2693 } 2694 2695 if (type & PERF_SAMPLE_IP) { 2696 data->ip = *array; 2697 array++; 2698 } 2699 2700 if (type & PERF_SAMPLE_TID) { 2701 u.val64 = *array; 2702 if (swapped) { 2703 /* undo swap of u64, then swap on individual u32s */ 2704 u.val64 = bswap_64(u.val64); 2705 u.val32[0] = bswap_32(u.val32[0]); 2706 u.val32[1] = bswap_32(u.val32[1]); 2707 } 2708 2709 data->pid = u.val32[0]; 2710 data->tid = u.val32[1]; 2711 array++; 2712 } 2713 2714 if (type & PERF_SAMPLE_TIME) { 2715 data->time = *array; 2716 array++; 2717 } 2718 2719 if (type & PERF_SAMPLE_ADDR) { 2720 data->addr = *array; 2721 array++; 2722 } 2723 2724 if (type & PERF_SAMPLE_ID) { 2725 data->id = *array; 2726 array++; 2727 } 2728 2729 if (type & PERF_SAMPLE_STREAM_ID) { 2730 data->stream_id = *array; 2731 array++; 2732 } 2733 2734 if (type & PERF_SAMPLE_CPU) { 2735 2736 u.val64 = *array; 2737 if (swapped) { 2738 /* undo swap of u64, then swap on individual u32s */ 2739 u.val64 = bswap_64(u.val64); 2740 u.val32[0] = bswap_32(u.val32[0]); 2741 } 2742 2743 data->cpu = u.val32[0]; 2744 array++; 2745 } 2746 2747 if (type & PERF_SAMPLE_PERIOD) { 2748 data->period = *array; 2749 array++; 2750 } 2751 2752 if (type & PERF_SAMPLE_READ) { 2753 u64 read_format = evsel->core.attr.read_format; 2754 2755 OVERFLOW_CHECK_u64(array); 2756 if (read_format & PERF_FORMAT_GROUP) 2757 data->read.group.nr = *array; 2758 else 2759 data->read.one.value = *array; 2760 2761 array++; 2762 2763 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2764 OVERFLOW_CHECK_u64(array); 2765 data->read.time_enabled = *array; 2766 array++; 2767 } 2768 2769 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2770 OVERFLOW_CHECK_u64(array); 2771 data->read.time_running = *array; 2772 array++; 2773 } 2774 2775 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2776 if (read_format & PERF_FORMAT_GROUP) { 2777 const u64 max_group_nr = UINT64_MAX / 2778 sizeof(struct sample_read_value); 2779 2780 if (data->read.group.nr > max_group_nr) 2781 return -EFAULT; 2782 2783 sz = data->read.group.nr * sample_read_value_size(read_format); 2784 OVERFLOW_CHECK(array, sz, max_size); 2785 data->read.group.values = 2786 (struct sample_read_value *)array; 2787 array = (void *)array + sz; 2788 } else { 2789 OVERFLOW_CHECK_u64(array); 2790 data->read.one.id = *array; 2791 array++; 2792 2793 if (read_format & PERF_FORMAT_LOST) { 2794 OVERFLOW_CHECK_u64(array); 2795 data->read.one.lost = *array; 2796 array++; 2797 } 2798 } 2799 } 2800 2801 if (type & PERF_SAMPLE_CALLCHAIN) { 2802 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2803 2804 OVERFLOW_CHECK_u64(array); 2805 data->callchain = (struct ip_callchain *)array++; 2806 if (data->callchain->nr > max_callchain_nr) 2807 return -EFAULT; 2808 sz = data->callchain->nr * sizeof(u64); 2809 OVERFLOW_CHECK(array, sz, max_size); 2810 array = (void *)array + sz; 2811 } 2812 2813 if (type & PERF_SAMPLE_RAW) { 2814 OVERFLOW_CHECK_u64(array); 2815 u.val64 = *array; 2816 2817 /* 2818 * Undo swap of u64, then swap on individual u32s, 2819 * get the size of the raw area and undo all of the 2820 * swap. The pevent interface handles endianness by 2821 * itself. 2822 */ 2823 if (swapped) { 2824 u.val64 = bswap_64(u.val64); 2825 u.val32[0] = bswap_32(u.val32[0]); 2826 u.val32[1] = bswap_32(u.val32[1]); 2827 } 2828 data->raw_size = u.val32[0]; 2829 2830 /* 2831 * The raw data is aligned on 64bits including the 2832 * u32 size, so it's safe to use mem_bswap_64. 2833 */ 2834 if (swapped) 2835 mem_bswap_64((void *) array, data->raw_size); 2836 2837 array = (void *)array + sizeof(u32); 2838 2839 OVERFLOW_CHECK(array, data->raw_size, max_size); 2840 data->raw_data = (void *)array; 2841 array = (void *)array + data->raw_size; 2842 } 2843 2844 if (type & PERF_SAMPLE_BRANCH_STACK) { 2845 const u64 max_branch_nr = UINT64_MAX / 2846 sizeof(struct branch_entry); 2847 struct branch_entry *e; 2848 unsigned int i; 2849 2850 OVERFLOW_CHECK_u64(array); 2851 data->branch_stack = (struct branch_stack *)array++; 2852 2853 if (data->branch_stack->nr > max_branch_nr) 2854 return -EFAULT; 2855 2856 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2857 if (evsel__has_branch_hw_idx(evsel)) { 2858 sz += sizeof(u64); 2859 e = &data->branch_stack->entries[0]; 2860 } else { 2861 data->no_hw_idx = true; 2862 /* 2863 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, 2864 * only nr and entries[] will be output by kernel. 2865 */ 2866 e = (struct branch_entry *)&data->branch_stack->hw_idx; 2867 } 2868 2869 if (swapped) { 2870 /* 2871 * struct branch_flag does not have endian 2872 * specific bit field definition. And bswap 2873 * will not resolve the issue, since these 2874 * are bit fields. 2875 * 2876 * evsel__bitfield_swap_branch_flags() uses a 2877 * bitfield_swap macro to swap the bit position 2878 * based on the host endians. 2879 */ 2880 for (i = 0; i < data->branch_stack->nr; i++, e++) 2881 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value); 2882 } 2883 2884 OVERFLOW_CHECK(array, sz, max_size); 2885 array = (void *)array + sz; 2886 2887 if (evsel__has_branch_counters(evsel)) { 2888 data->branch_stack_cntr = (u64 *)array; 2889 sz = data->branch_stack->nr * sizeof(u64); 2890 2891 OVERFLOW_CHECK(array, sz, max_size); 2892 array = (void *)array + sz; 2893 } 2894 } 2895 2896 if (type & PERF_SAMPLE_REGS_USER) { 2897 OVERFLOW_CHECK_u64(array); 2898 data->user_regs.abi = *array; 2899 array++; 2900 2901 if (data->user_regs.abi) { 2902 u64 mask = evsel->core.attr.sample_regs_user; 2903 2904 sz = hweight64(mask) * sizeof(u64); 2905 OVERFLOW_CHECK(array, sz, max_size); 2906 data->user_regs.mask = mask; 2907 data->user_regs.regs = (u64 *)array; 2908 array = (void *)array + sz; 2909 } 2910 } 2911 2912 if (type & PERF_SAMPLE_STACK_USER) { 2913 OVERFLOW_CHECK_u64(array); 2914 sz = *array++; 2915 2916 data->user_stack.offset = ((char *)(array - 1) 2917 - (char *) event); 2918 2919 if (!sz) { 2920 data->user_stack.size = 0; 2921 } else { 2922 OVERFLOW_CHECK(array, sz, max_size); 2923 data->user_stack.data = (char *)array; 2924 array = (void *)array + sz; 2925 OVERFLOW_CHECK_u64(array); 2926 data->user_stack.size = *array++; 2927 if (WARN_ONCE(data->user_stack.size > sz, 2928 "user stack dump failure\n")) 2929 return -EFAULT; 2930 } 2931 } 2932 2933 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 2934 OVERFLOW_CHECK_u64(array); 2935 arch_perf_parse_sample_weight(data, array, type); 2936 array++; 2937 } 2938 2939 if (type & PERF_SAMPLE_DATA_SRC) { 2940 OVERFLOW_CHECK_u64(array); 2941 data->data_src = *array; 2942 array++; 2943 } 2944 2945 if (type & PERF_SAMPLE_TRANSACTION) { 2946 OVERFLOW_CHECK_u64(array); 2947 data->transaction = *array; 2948 array++; 2949 } 2950 2951 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2952 if (type & PERF_SAMPLE_REGS_INTR) { 2953 OVERFLOW_CHECK_u64(array); 2954 data->intr_regs.abi = *array; 2955 array++; 2956 2957 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2958 u64 mask = evsel->core.attr.sample_regs_intr; 2959 2960 sz = hweight64(mask) * sizeof(u64); 2961 OVERFLOW_CHECK(array, sz, max_size); 2962 data->intr_regs.mask = mask; 2963 data->intr_regs.regs = (u64 *)array; 2964 array = (void *)array + sz; 2965 } 2966 } 2967 2968 data->phys_addr = 0; 2969 if (type & PERF_SAMPLE_PHYS_ADDR) { 2970 data->phys_addr = *array; 2971 array++; 2972 } 2973 2974 data->cgroup = 0; 2975 if (type & PERF_SAMPLE_CGROUP) { 2976 data->cgroup = *array; 2977 array++; 2978 } 2979 2980 data->data_page_size = 0; 2981 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 2982 data->data_page_size = *array; 2983 array++; 2984 } 2985 2986 data->code_page_size = 0; 2987 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 2988 data->code_page_size = *array; 2989 array++; 2990 } 2991 2992 if (type & PERF_SAMPLE_AUX) { 2993 OVERFLOW_CHECK_u64(array); 2994 sz = *array++; 2995 2996 OVERFLOW_CHECK(array, sz, max_size); 2997 /* Undo swap of data */ 2998 if (swapped) 2999 mem_bswap_64((char *)array, sz); 3000 data->aux_sample.size = sz; 3001 data->aux_sample.data = (char *)array; 3002 array = (void *)array + sz; 3003 } 3004 3005 return 0; 3006 } 3007 3008 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 3009 u64 *timestamp) 3010 { 3011 u64 type = evsel->core.attr.sample_type; 3012 const __u64 *array; 3013 3014 if (!(type & PERF_SAMPLE_TIME)) 3015 return -1; 3016 3017 if (event->header.type != PERF_RECORD_SAMPLE) { 3018 struct perf_sample data = { 3019 .time = -1ULL, 3020 }; 3021 3022 if (!evsel->core.attr.sample_id_all) 3023 return -1; 3024 if (perf_evsel__parse_id_sample(evsel, event, &data)) 3025 return -1; 3026 3027 *timestamp = data.time; 3028 return 0; 3029 } 3030 3031 array = event->sample.array; 3032 3033 if (perf_event__check_size(event, evsel->sample_size)) 3034 return -EFAULT; 3035 3036 if (type & PERF_SAMPLE_IDENTIFIER) 3037 array++; 3038 3039 if (type & PERF_SAMPLE_IP) 3040 array++; 3041 3042 if (type & PERF_SAMPLE_TID) 3043 array++; 3044 3045 if (type & PERF_SAMPLE_TIME) 3046 *timestamp = *array; 3047 3048 return 0; 3049 } 3050 3051 u16 evsel__id_hdr_size(const struct evsel *evsel) 3052 { 3053 u64 sample_type = evsel->core.attr.sample_type; 3054 u16 size = 0; 3055 3056 if (sample_type & PERF_SAMPLE_TID) 3057 size += sizeof(u64); 3058 3059 if (sample_type & PERF_SAMPLE_TIME) 3060 size += sizeof(u64); 3061 3062 if (sample_type & PERF_SAMPLE_ID) 3063 size += sizeof(u64); 3064 3065 if (sample_type & PERF_SAMPLE_STREAM_ID) 3066 size += sizeof(u64); 3067 3068 if (sample_type & PERF_SAMPLE_CPU) 3069 size += sizeof(u64); 3070 3071 if (sample_type & PERF_SAMPLE_IDENTIFIER) 3072 size += sizeof(u64); 3073 3074 return size; 3075 } 3076 3077 #ifdef HAVE_LIBTRACEEVENT 3078 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 3079 { 3080 return tep_find_field(evsel->tp_format, name); 3081 } 3082 3083 struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name) 3084 { 3085 return tep_find_common_field(evsel->tp_format, name); 3086 } 3087 3088 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 3089 { 3090 struct tep_format_field *field = evsel__field(evsel, name); 3091 int offset; 3092 3093 if (!field) 3094 return NULL; 3095 3096 offset = field->offset; 3097 3098 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 3099 offset = *(int *)(sample->raw_data + field->offset); 3100 offset &= 0xffff; 3101 if (tep_field_is_relative(field->flags)) 3102 offset += field->offset + field->size; 3103 } 3104 3105 return sample->raw_data + offset; 3106 } 3107 3108 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 3109 bool needs_swap) 3110 { 3111 u64 value; 3112 void *ptr = sample->raw_data + field->offset; 3113 3114 switch (field->size) { 3115 case 1: 3116 return *(u8 *)ptr; 3117 case 2: 3118 value = *(u16 *)ptr; 3119 break; 3120 case 4: 3121 value = *(u32 *)ptr; 3122 break; 3123 case 8: 3124 memcpy(&value, ptr, sizeof(u64)); 3125 break; 3126 default: 3127 return 0; 3128 } 3129 3130 if (!needs_swap) 3131 return value; 3132 3133 switch (field->size) { 3134 case 2: 3135 return bswap_16(value); 3136 case 4: 3137 return bswap_32(value); 3138 case 8: 3139 return bswap_64(value); 3140 default: 3141 return 0; 3142 } 3143 3144 return 0; 3145 } 3146 3147 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 3148 { 3149 struct tep_format_field *field = evsel__field(evsel, name); 3150 3151 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 3152 } 3153 3154 u64 evsel__intval_common(struct evsel *evsel, struct perf_sample *sample, const char *name) 3155 { 3156 struct tep_format_field *field = evsel__common_field(evsel, name); 3157 3158 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 3159 } 3160 3161 char evsel__taskstate(struct evsel *evsel, struct perf_sample *sample, const char *name) 3162 { 3163 static struct tep_format_field *prev_state_field; 3164 static const char *states; 3165 struct tep_format_field *field; 3166 unsigned long long val; 3167 unsigned int bit; 3168 char state = '?'; /* '?' denotes unknown task state */ 3169 3170 field = evsel__field(evsel, name); 3171 3172 if (!field) 3173 return state; 3174 3175 if (!states || field != prev_state_field) { 3176 states = parse_task_states(field); 3177 if (!states) 3178 return state; 3179 prev_state_field = field; 3180 } 3181 3182 /* 3183 * Note since the kernel exposes TASK_REPORT_MAX to userspace 3184 * to denote the 'preempted' state, we might as welll report 3185 * 'R' for this case, which make senses to users as well. 3186 * 3187 * We can change this if we have a good reason in the future. 3188 */ 3189 val = evsel__intval(evsel, sample, name); 3190 bit = val ? ffs(val) : 0; 3191 state = (!bit || bit > strlen(states)) ? 'R' : states[bit-1]; 3192 return state; 3193 } 3194 #endif 3195 3196 bool evsel__fallback(struct evsel *evsel, struct target *target, int err, 3197 char *msg, size_t msgsize) 3198 { 3199 int paranoid; 3200 3201 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 3202 evsel->core.attr.type == PERF_TYPE_HARDWARE && 3203 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 3204 /* 3205 * If it's cycles then fall back to hrtimer based cpu-clock sw 3206 * counter, which is always available even if no PMU support. 3207 * 3208 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 3209 * b0a873e). 3210 */ 3211 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 3212 evsel->core.attr.config = target__has_cpu(target) 3213 ? PERF_COUNT_SW_CPU_CLOCK 3214 : PERF_COUNT_SW_TASK_CLOCK; 3215 scnprintf(msg, msgsize, 3216 "The cycles event is not supported, trying to fall back to %s", 3217 target__has_cpu(target) ? "cpu-clock" : "task-clock"); 3218 3219 zfree(&evsel->name); 3220 return true; 3221 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 3222 (paranoid = perf_event_paranoid()) > 1) { 3223 const char *name = evsel__name(evsel); 3224 char *new_name; 3225 const char *sep = ":"; 3226 3227 /* If event has exclude user then don't exclude kernel. */ 3228 if (evsel->core.attr.exclude_user) 3229 return false; 3230 3231 /* Is there already the separator in the name. */ 3232 if (strchr(name, '/') || 3233 (strchr(name, ':') && !evsel->is_libpfm_event)) 3234 sep = ""; 3235 3236 if (asprintf(&new_name, "%s%su", name, sep) < 0) 3237 return false; 3238 3239 free(evsel->name); 3240 evsel->name = new_name; 3241 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 3242 "to fall back to excluding kernel and hypervisor " 3243 " samples", paranoid); 3244 evsel->core.attr.exclude_kernel = 1; 3245 evsel->core.attr.exclude_hv = 1; 3246 3247 return true; 3248 } 3249 3250 return false; 3251 } 3252 3253 static bool find_process(const char *name) 3254 { 3255 size_t len = strlen(name); 3256 DIR *dir; 3257 struct dirent *d; 3258 int ret = -1; 3259 3260 dir = opendir(procfs__mountpoint()); 3261 if (!dir) 3262 return false; 3263 3264 /* Walk through the directory. */ 3265 while (ret && (d = readdir(dir)) != NULL) { 3266 char path[PATH_MAX]; 3267 char *data; 3268 size_t size; 3269 3270 if ((d->d_type != DT_DIR) || 3271 !strcmp(".", d->d_name) || 3272 !strcmp("..", d->d_name)) 3273 continue; 3274 3275 scnprintf(path, sizeof(path), "%s/%s/comm", 3276 procfs__mountpoint(), d->d_name); 3277 3278 if (filename__read_str(path, &data, &size)) 3279 continue; 3280 3281 ret = strncmp(name, data, len); 3282 free(data); 3283 } 3284 3285 closedir(dir); 3286 return ret ? false : true; 3287 } 3288 3289 int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused, 3290 char *msg __maybe_unused, 3291 size_t size __maybe_unused) 3292 { 3293 return 0; 3294 } 3295 3296 int evsel__open_strerror(struct evsel *evsel, struct target *target, 3297 int err, char *msg, size_t size) 3298 { 3299 char sbuf[STRERR_BUFSIZE]; 3300 int printed = 0, enforced = 0; 3301 int ret; 3302 3303 switch (err) { 3304 case EPERM: 3305 case EACCES: 3306 printed += scnprintf(msg + printed, size - printed, 3307 "Access to performance monitoring and observability operations is limited.\n"); 3308 3309 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 3310 if (enforced) { 3311 printed += scnprintf(msg + printed, size - printed, 3312 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 3313 "monitoring and observability operations. Inspect system audit records for\n" 3314 "more perf_event access control information and adjusting the policy.\n"); 3315 } 3316 } 3317 3318 if (err == EPERM) 3319 printed += scnprintf(msg, size, 3320 "No permission to enable %s event.\n\n", evsel__name(evsel)); 3321 3322 return scnprintf(msg + printed, size - printed, 3323 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 3324 "access to performance monitoring and observability operations for processes\n" 3325 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 3326 "More information can be found at 'Perf events and tool security' document:\n" 3327 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 3328 "perf_event_paranoid setting is %d:\n" 3329 " -1: Allow use of (almost) all events by all users\n" 3330 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 3331 ">= 0: Disallow raw and ftrace function tracepoint access\n" 3332 ">= 1: Disallow CPU event access\n" 3333 ">= 2: Disallow kernel profiling\n" 3334 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 3335 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 3336 perf_event_paranoid()); 3337 case ENOENT: 3338 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 3339 case EMFILE: 3340 return scnprintf(msg, size, "%s", 3341 "Too many events are opened.\n" 3342 "Probably the maximum number of open file descriptors has been reached.\n" 3343 "Hint: Try again after reducing the number of events.\n" 3344 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 3345 case ENOMEM: 3346 if (evsel__has_callchain(evsel) && 3347 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 3348 return scnprintf(msg, size, 3349 "Not enough memory to setup event with callchain.\n" 3350 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 3351 "Hint: Current value: %d", sysctl__max_stack()); 3352 break; 3353 case ENODEV: 3354 if (target->cpu_list) 3355 return scnprintf(msg, size, "%s", 3356 "No such device - did you specify an out-of-range profile CPU?"); 3357 break; 3358 case EOPNOTSUPP: 3359 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) 3360 return scnprintf(msg, size, 3361 "%s: PMU Hardware or event type doesn't support branch stack sampling.", 3362 evsel__name(evsel)); 3363 if (evsel->core.attr.aux_output) 3364 return scnprintf(msg, size, 3365 "%s: PMU Hardware doesn't support 'aux_output' feature", 3366 evsel__name(evsel)); 3367 if (evsel->core.attr.sample_period != 0) 3368 return scnprintf(msg, size, 3369 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 3370 evsel__name(evsel)); 3371 if (evsel->core.attr.precise_ip) 3372 return scnprintf(msg, size, "%s", 3373 "\'precise\' request may not be supported. Try removing 'p' modifier."); 3374 #if defined(__i386__) || defined(__x86_64__) 3375 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 3376 return scnprintf(msg, size, "%s", 3377 "No hardware sampling interrupt available.\n"); 3378 #endif 3379 break; 3380 case EBUSY: 3381 if (find_process("oprofiled")) 3382 return scnprintf(msg, size, 3383 "The PMU counters are busy/taken by another profiler.\n" 3384 "We found oprofile daemon running, please stop it and try again."); 3385 break; 3386 case EINVAL: 3387 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size) 3388 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel."); 3389 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size) 3390 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel."); 3391 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 3392 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 3393 if (perf_missing_features.clockid) 3394 return scnprintf(msg, size, "clockid feature not supported."); 3395 if (perf_missing_features.clockid_wrong) 3396 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 3397 if (perf_missing_features.aux_output) 3398 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 3399 if (!target__has_cpu(target)) 3400 return scnprintf(msg, size, 3401 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.", 3402 evsel__name(evsel)); 3403 3404 break; 3405 case ENODATA: 3406 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. " 3407 "Please add an auxiliary event in front of the load latency event."); 3408 default: 3409 break; 3410 } 3411 3412 ret = arch_evsel__open_strerror(evsel, msg, size); 3413 if (ret) 3414 return ret; 3415 3416 return scnprintf(msg, size, 3417 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 3418 "/bin/dmesg | grep -i perf may provide additional information.\n", 3419 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel)); 3420 } 3421 3422 struct perf_env *evsel__env(struct evsel *evsel) 3423 { 3424 if (evsel && evsel->evlist && evsel->evlist->env) 3425 return evsel->evlist->env; 3426 return &perf_env; 3427 } 3428 3429 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 3430 { 3431 int cpu_map_idx, thread; 3432 3433 if (evsel__is_retire_lat(evsel)) 3434 return 0; 3435 3436 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) { 3437 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 3438 thread++) { 3439 int fd = FD(evsel, cpu_map_idx, thread); 3440 3441 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 3442 cpu_map_idx, thread, fd) < 0) 3443 return -1; 3444 } 3445 } 3446 3447 return 0; 3448 } 3449 3450 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 3451 { 3452 struct perf_cpu_map *cpus = evsel->core.cpus; 3453 struct perf_thread_map *threads = evsel->core.threads; 3454 3455 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr)) 3456 return -ENOMEM; 3457 3458 return store_evsel_ids(evsel, evlist); 3459 } 3460 3461 void evsel__zero_per_pkg(struct evsel *evsel) 3462 { 3463 struct hashmap_entry *cur; 3464 size_t bkt; 3465 3466 if (evsel->per_pkg_mask) { 3467 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt) 3468 zfree(&cur->pkey); 3469 3470 hashmap__clear(evsel->per_pkg_mask); 3471 } 3472 } 3473 3474 /** 3475 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this 3476 * will be false on hybrid systems for hardware and legacy 3477 * cache events. 3478 */ 3479 bool evsel__is_hybrid(const struct evsel *evsel) 3480 { 3481 if (perf_pmus__num_core_pmus() == 1) 3482 return false; 3483 3484 return evsel->core.is_pmu_core; 3485 } 3486 3487 struct evsel *evsel__leader(const struct evsel *evsel) 3488 { 3489 return container_of(evsel->core.leader, struct evsel, core); 3490 } 3491 3492 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader) 3493 { 3494 return evsel->core.leader == &leader->core; 3495 } 3496 3497 bool evsel__is_leader(struct evsel *evsel) 3498 { 3499 return evsel__has_leader(evsel, evsel); 3500 } 3501 3502 void evsel__set_leader(struct evsel *evsel, struct evsel *leader) 3503 { 3504 evsel->core.leader = &leader->core; 3505 } 3506 3507 int evsel__source_count(const struct evsel *evsel) 3508 { 3509 struct evsel *pos; 3510 int count = 0; 3511 3512 evlist__for_each_entry(evsel->evlist, pos) { 3513 if (pos->metric_leader == evsel) 3514 count++; 3515 } 3516 return count; 3517 } 3518 3519 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused) 3520 { 3521 return false; 3522 } 3523 3524 /* 3525 * Remove an event from a given group (leader). 3526 * Some events, e.g., perf metrics Topdown events, 3527 * must always be grouped. Ignore the events. 3528 */ 3529 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader) 3530 { 3531 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) { 3532 evsel__set_leader(evsel, evsel); 3533 evsel->core.nr_members = 0; 3534 leader->core.nr_members--; 3535 } 3536 } 3537