1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 4 * 5 * Parts came from builtin-{top,stat,record}.c, see those files for further 6 * copyright notes. 7 */ 8 9 #include <byteswap.h> 10 #include <errno.h> 11 #include <inttypes.h> 12 #include <linux/bitops.h> 13 #include <api/fs/fs.h> 14 #include <api/fs/tracing_path.h> 15 #include <traceevent/event-parse.h> 16 #include <linux/hw_breakpoint.h> 17 #include <linux/perf_event.h> 18 #include <linux/compiler.h> 19 #include <linux/err.h> 20 #include <linux/zalloc.h> 21 #include <sys/ioctl.h> 22 #include <sys/resource.h> 23 #include <sys/types.h> 24 #include <dirent.h> 25 #include <stdlib.h> 26 #include <perf/evsel.h> 27 #include "asm/bug.h" 28 #include "callchain.h" 29 #include "cgroup.h" 30 #include "counts.h" 31 #include "event.h" 32 #include "evsel.h" 33 #include "util/env.h" 34 #include "util/evsel_config.h" 35 #include "util/evsel_fprintf.h" 36 #include "evlist.h" 37 #include <perf/cpumap.h> 38 #include "thread_map.h" 39 #include "target.h" 40 #include "perf_regs.h" 41 #include "record.h" 42 #include "debug.h" 43 #include "trace-event.h" 44 #include "stat.h" 45 #include "string2.h" 46 #include "memswap.h" 47 #include "util.h" 48 #include "../perf-sys.h" 49 #include "util/parse-branch-options.h" 50 #include <internal/xyarray.h> 51 #include <internal/lib.h> 52 53 #include <linux/ctype.h> 54 55 struct perf_missing_features perf_missing_features; 56 57 static clockid_t clockid; 58 59 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused) 60 { 61 return 0; 62 } 63 64 void __weak test_attr__ready(void) { } 65 66 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused) 67 { 68 } 69 70 static struct { 71 size_t size; 72 int (*init)(struct evsel *evsel); 73 void (*fini)(struct evsel *evsel); 74 } perf_evsel__object = { 75 .size = sizeof(struct evsel), 76 .init = evsel__no_extra_init, 77 .fini = evsel__no_extra_fini, 78 }; 79 80 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel), 81 void (*fini)(struct evsel *evsel)) 82 { 83 84 if (object_size == 0) 85 goto set_methods; 86 87 if (perf_evsel__object.size > object_size) 88 return -EINVAL; 89 90 perf_evsel__object.size = object_size; 91 92 set_methods: 93 if (init != NULL) 94 perf_evsel__object.init = init; 95 96 if (fini != NULL) 97 perf_evsel__object.fini = fini; 98 99 return 0; 100 } 101 102 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y)) 103 104 int __evsel__sample_size(u64 sample_type) 105 { 106 u64 mask = sample_type & PERF_SAMPLE_MASK; 107 int size = 0; 108 int i; 109 110 for (i = 0; i < 64; i++) { 111 if (mask & (1ULL << i)) 112 size++; 113 } 114 115 size *= sizeof(u64); 116 117 return size; 118 } 119 120 /** 121 * __perf_evsel__calc_id_pos - calculate id_pos. 122 * @sample_type: sample type 123 * 124 * This function returns the position of the event id (PERF_SAMPLE_ID or 125 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 126 * perf_record_sample. 127 */ 128 static int __perf_evsel__calc_id_pos(u64 sample_type) 129 { 130 int idx = 0; 131 132 if (sample_type & PERF_SAMPLE_IDENTIFIER) 133 return 0; 134 135 if (!(sample_type & PERF_SAMPLE_ID)) 136 return -1; 137 138 if (sample_type & PERF_SAMPLE_IP) 139 idx += 1; 140 141 if (sample_type & PERF_SAMPLE_TID) 142 idx += 1; 143 144 if (sample_type & PERF_SAMPLE_TIME) 145 idx += 1; 146 147 if (sample_type & PERF_SAMPLE_ADDR) 148 idx += 1; 149 150 return idx; 151 } 152 153 /** 154 * __perf_evsel__calc_is_pos - calculate is_pos. 155 * @sample_type: sample type 156 * 157 * This function returns the position (counting backwards) of the event id 158 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 159 * sample_id_all is used there is an id sample appended to non-sample events. 160 */ 161 static int __perf_evsel__calc_is_pos(u64 sample_type) 162 { 163 int idx = 1; 164 165 if (sample_type & PERF_SAMPLE_IDENTIFIER) 166 return 1; 167 168 if (!(sample_type & PERF_SAMPLE_ID)) 169 return -1; 170 171 if (sample_type & PERF_SAMPLE_CPU) 172 idx += 1; 173 174 if (sample_type & PERF_SAMPLE_STREAM_ID) 175 idx += 1; 176 177 return idx; 178 } 179 180 void evsel__calc_id_pos(struct evsel *evsel) 181 { 182 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type); 183 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type); 184 } 185 186 void __evsel__set_sample_bit(struct evsel *evsel, 187 enum perf_event_sample_format bit) 188 { 189 if (!(evsel->core.attr.sample_type & bit)) { 190 evsel->core.attr.sample_type |= bit; 191 evsel->sample_size += sizeof(u64); 192 evsel__calc_id_pos(evsel); 193 } 194 } 195 196 void __evsel__reset_sample_bit(struct evsel *evsel, 197 enum perf_event_sample_format bit) 198 { 199 if (evsel->core.attr.sample_type & bit) { 200 evsel->core.attr.sample_type &= ~bit; 201 evsel->sample_size -= sizeof(u64); 202 evsel__calc_id_pos(evsel); 203 } 204 } 205 206 void evsel__set_sample_id(struct evsel *evsel, 207 bool can_sample_identifier) 208 { 209 if (can_sample_identifier) { 210 evsel__reset_sample_bit(evsel, ID); 211 evsel__set_sample_bit(evsel, IDENTIFIER); 212 } else { 213 evsel__set_sample_bit(evsel, ID); 214 } 215 evsel->core.attr.read_format |= PERF_FORMAT_ID; 216 } 217 218 /** 219 * evsel__is_function_event - Return whether given evsel is a function 220 * trace event 221 * 222 * @evsel - evsel selector to be tested 223 * 224 * Return %true if event is function trace event 225 */ 226 bool evsel__is_function_event(struct evsel *evsel) 227 { 228 #define FUNCTION_EVENT "ftrace:function" 229 230 return evsel->name && 231 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT)); 232 233 #undef FUNCTION_EVENT 234 } 235 236 void evsel__init(struct evsel *evsel, 237 struct perf_event_attr *attr, int idx) 238 { 239 perf_evsel__init(&evsel->core, attr); 240 evsel->idx = idx; 241 evsel->tracking = !idx; 242 evsel->leader = evsel; 243 evsel->unit = ""; 244 evsel->scale = 1.0; 245 evsel->max_events = ULONG_MAX; 246 evsel->evlist = NULL; 247 evsel->bpf_obj = NULL; 248 evsel->bpf_fd = -1; 249 INIT_LIST_HEAD(&evsel->config_terms); 250 perf_evsel__object.init(evsel); 251 evsel->sample_size = __evsel__sample_size(attr->sample_type); 252 evsel__calc_id_pos(evsel); 253 evsel->cmdline_group_boundary = false; 254 evsel->metric_expr = NULL; 255 evsel->metric_name = NULL; 256 evsel->metric_events = NULL; 257 evsel->per_pkg_mask = NULL; 258 evsel->collect_stat = false; 259 evsel->pmu_name = NULL; 260 } 261 262 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx) 263 { 264 struct evsel *evsel = zalloc(perf_evsel__object.size); 265 266 if (!evsel) 267 return NULL; 268 evsel__init(evsel, attr, idx); 269 270 if (evsel__is_bpf_output(evsel)) { 271 evsel->core.attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 272 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 273 evsel->core.attr.sample_period = 1; 274 } 275 276 if (evsel__is_clock(evsel)) { 277 /* 278 * The evsel->unit points to static alias->unit 279 * so it's ok to use static string in here. 280 */ 281 static const char *unit = "msec"; 282 283 evsel->unit = unit; 284 evsel->scale = 1e-6; 285 } 286 287 return evsel; 288 } 289 290 static bool perf_event_can_profile_kernel(void) 291 { 292 return perf_event_paranoid_check(1); 293 } 294 295 struct evsel *evsel__new_cycles(bool precise) 296 { 297 struct perf_event_attr attr = { 298 .type = PERF_TYPE_HARDWARE, 299 .config = PERF_COUNT_HW_CPU_CYCLES, 300 .exclude_kernel = !perf_event_can_profile_kernel(), 301 }; 302 struct evsel *evsel; 303 304 event_attr_init(&attr); 305 306 if (!precise) 307 goto new_event; 308 309 /* 310 * Now let the usual logic to set up the perf_event_attr defaults 311 * to kick in when we return and before perf_evsel__open() is called. 312 */ 313 new_event: 314 evsel = evsel__new(&attr); 315 if (evsel == NULL) 316 goto out; 317 318 evsel->precise_max = true; 319 320 /* use asprintf() because free(evsel) assumes name is allocated */ 321 if (asprintf(&evsel->name, "cycles%s%s%.*s", 322 (attr.precise_ip || attr.exclude_kernel) ? ":" : "", 323 attr.exclude_kernel ? "u" : "", 324 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0) 325 goto error_free; 326 out: 327 return evsel; 328 error_free: 329 evsel__delete(evsel); 330 evsel = NULL; 331 goto out; 332 } 333 334 /* 335 * Returns pointer with encoded error via <linux/err.h> interface. 336 */ 337 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx) 338 { 339 struct evsel *evsel = zalloc(perf_evsel__object.size); 340 int err = -ENOMEM; 341 342 if (evsel == NULL) { 343 goto out_err; 344 } else { 345 struct perf_event_attr attr = { 346 .type = PERF_TYPE_TRACEPOINT, 347 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 348 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 349 }; 350 351 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 352 goto out_free; 353 354 evsel->tp_format = trace_event__tp_format(sys, name); 355 if (IS_ERR(evsel->tp_format)) { 356 err = PTR_ERR(evsel->tp_format); 357 goto out_free; 358 } 359 360 event_attr_init(&attr); 361 attr.config = evsel->tp_format->id; 362 attr.sample_period = 1; 363 evsel__init(evsel, &attr, idx); 364 } 365 366 return evsel; 367 368 out_free: 369 zfree(&evsel->name); 370 free(evsel); 371 out_err: 372 return ERR_PTR(err); 373 } 374 375 const char *evsel__hw_names[PERF_COUNT_HW_MAX] = { 376 "cycles", 377 "instructions", 378 "cache-references", 379 "cache-misses", 380 "branches", 381 "branch-misses", 382 "bus-cycles", 383 "stalled-cycles-frontend", 384 "stalled-cycles-backend", 385 "ref-cycles", 386 }; 387 388 static const char *__evsel__hw_name(u64 config) 389 { 390 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config]) 391 return evsel__hw_names[config]; 392 393 return "unknown-hardware"; 394 } 395 396 static int perf_evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size) 397 { 398 int colon = 0, r = 0; 399 struct perf_event_attr *attr = &evsel->core.attr; 400 bool exclude_guest_default = false; 401 402 #define MOD_PRINT(context, mod) do { \ 403 if (!attr->exclude_##context) { \ 404 if (!colon) colon = ++r; \ 405 r += scnprintf(bf + r, size - r, "%c", mod); \ 406 } } while(0) 407 408 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 409 MOD_PRINT(kernel, 'k'); 410 MOD_PRINT(user, 'u'); 411 MOD_PRINT(hv, 'h'); 412 exclude_guest_default = true; 413 } 414 415 if (attr->precise_ip) { 416 if (!colon) 417 colon = ++r; 418 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 419 exclude_guest_default = true; 420 } 421 422 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 423 MOD_PRINT(host, 'H'); 424 MOD_PRINT(guest, 'G'); 425 } 426 #undef MOD_PRINT 427 if (colon) 428 bf[colon - 1] = ':'; 429 return r; 430 } 431 432 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 433 { 434 int r = scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config)); 435 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 436 } 437 438 const char *evsel__sw_names[PERF_COUNT_SW_MAX] = { 439 "cpu-clock", 440 "task-clock", 441 "page-faults", 442 "context-switches", 443 "cpu-migrations", 444 "minor-faults", 445 "major-faults", 446 "alignment-faults", 447 "emulation-faults", 448 "dummy", 449 }; 450 451 static const char *__evsel__sw_name(u64 config) 452 { 453 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config]) 454 return evsel__sw_names[config]; 455 return "unknown-software"; 456 } 457 458 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 459 { 460 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config)); 461 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 462 } 463 464 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 465 { 466 int r; 467 468 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 469 470 if (type & HW_BREAKPOINT_R) 471 r += scnprintf(bf + r, size - r, "r"); 472 473 if (type & HW_BREAKPOINT_W) 474 r += scnprintf(bf + r, size - r, "w"); 475 476 if (type & HW_BREAKPOINT_X) 477 r += scnprintf(bf + r, size - r, "x"); 478 479 return r; 480 } 481 482 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 483 { 484 struct perf_event_attr *attr = &evsel->core.attr; 485 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 486 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 487 } 488 489 const char *evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = { 490 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 491 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 492 { "LLC", "L2", }, 493 { "dTLB", "d-tlb", "Data-TLB", }, 494 { "iTLB", "i-tlb", "Instruction-TLB", }, 495 { "branch", "branches", "bpu", "btb", "bpc", }, 496 { "node", }, 497 }; 498 499 const char *evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = { 500 { "load", "loads", "read", }, 501 { "store", "stores", "write", }, 502 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 503 }; 504 505 const char *evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = { 506 { "refs", "Reference", "ops", "access", }, 507 { "misses", "miss", }, 508 }; 509 510 #define C(x) PERF_COUNT_HW_CACHE_##x 511 #define CACHE_READ (1 << C(OP_READ)) 512 #define CACHE_WRITE (1 << C(OP_WRITE)) 513 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 514 #define COP(x) (1 << x) 515 516 /* 517 * cache operartion stat 518 * L1I : Read and prefetch only 519 * ITLB and BPU : Read-only 520 */ 521 static unsigned long evsel__hw_cache_stat[C(MAX)] = { 522 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 523 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 524 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 525 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 526 [C(ITLB)] = (CACHE_READ), 527 [C(BPU)] = (CACHE_READ), 528 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 529 }; 530 531 bool evsel__is_cache_op_valid(u8 type, u8 op) 532 { 533 if (evsel__hw_cache_stat[type] & COP(op)) 534 return true; /* valid */ 535 else 536 return false; /* invalid */ 537 } 538 539 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size) 540 { 541 if (result) { 542 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0], 543 evsel__hw_cache_op[op][0], 544 evsel__hw_cache_result[result][0]); 545 } 546 547 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0], 548 evsel__hw_cache_op[op][1]); 549 } 550 551 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size) 552 { 553 u8 op, result, type = (config >> 0) & 0xff; 554 const char *err = "unknown-ext-hardware-cache-type"; 555 556 if (type >= PERF_COUNT_HW_CACHE_MAX) 557 goto out_err; 558 559 op = (config >> 8) & 0xff; 560 err = "unknown-ext-hardware-cache-op"; 561 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 562 goto out_err; 563 564 result = (config >> 16) & 0xff; 565 err = "unknown-ext-hardware-cache-result"; 566 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 567 goto out_err; 568 569 err = "invalid-cache"; 570 if (!evsel__is_cache_op_valid(type, op)) 571 goto out_err; 572 573 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 574 out_err: 575 return scnprintf(bf, size, "%s", err); 576 } 577 578 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 579 { 580 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size); 581 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 582 } 583 584 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 585 { 586 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 587 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 588 } 589 590 static int evsel__tool_name(char *bf, size_t size) 591 { 592 int ret = scnprintf(bf, size, "duration_time"); 593 return ret; 594 } 595 596 const char *evsel__name(struct evsel *evsel) 597 { 598 char bf[128]; 599 600 if (!evsel) 601 goto out_unknown; 602 603 if (evsel->name) 604 return evsel->name; 605 606 switch (evsel->core.attr.type) { 607 case PERF_TYPE_RAW: 608 evsel__raw_name(evsel, bf, sizeof(bf)); 609 break; 610 611 case PERF_TYPE_HARDWARE: 612 evsel__hw_name(evsel, bf, sizeof(bf)); 613 break; 614 615 case PERF_TYPE_HW_CACHE: 616 evsel__hw_cache_name(evsel, bf, sizeof(bf)); 617 break; 618 619 case PERF_TYPE_SOFTWARE: 620 if (evsel->tool_event) 621 evsel__tool_name(bf, sizeof(bf)); 622 else 623 evsel__sw_name(evsel, bf, sizeof(bf)); 624 break; 625 626 case PERF_TYPE_TRACEPOINT: 627 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 628 break; 629 630 case PERF_TYPE_BREAKPOINT: 631 evsel__bp_name(evsel, bf, sizeof(bf)); 632 break; 633 634 default: 635 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 636 evsel->core.attr.type); 637 break; 638 } 639 640 evsel->name = strdup(bf); 641 642 if (evsel->name) 643 return evsel->name; 644 out_unknown: 645 return "unknown"; 646 } 647 648 const char *evsel__group_name(struct evsel *evsel) 649 { 650 return evsel->group_name ?: "anon group"; 651 } 652 653 /* 654 * Returns the group details for the specified leader, 655 * with following rules. 656 * 657 * For record -e '{cycles,instructions}' 658 * 'anon group { cycles:u, instructions:u }' 659 * 660 * For record -e 'cycles,instructions' and report --group 661 * 'cycles:u, instructions:u' 662 */ 663 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 664 { 665 int ret = 0; 666 struct evsel *pos; 667 const char *group_name = evsel__group_name(evsel); 668 669 if (!evsel->forced_leader) 670 ret = scnprintf(buf, size, "%s { ", group_name); 671 672 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel)); 673 674 for_each_group_member(pos, evsel) 675 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos)); 676 677 if (!evsel->forced_leader) 678 ret += scnprintf(buf + ret, size - ret, " }"); 679 680 return ret; 681 } 682 683 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 684 struct callchain_param *param) 685 { 686 bool function = evsel__is_function_event(evsel); 687 struct perf_event_attr *attr = &evsel->core.attr; 688 689 evsel__set_sample_bit(evsel, CALLCHAIN); 690 691 attr->sample_max_stack = param->max_stack; 692 693 if (opts->kernel_callchains) 694 attr->exclude_callchain_user = 1; 695 if (opts->user_callchains) 696 attr->exclude_callchain_kernel = 1; 697 if (param->record_mode == CALLCHAIN_LBR) { 698 if (!opts->branch_stack) { 699 if (attr->exclude_user) { 700 pr_warning("LBR callstack option is only available " 701 "to get user callchain information. " 702 "Falling back to framepointers.\n"); 703 } else { 704 evsel__set_sample_bit(evsel, BRANCH_STACK); 705 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 706 PERF_SAMPLE_BRANCH_CALL_STACK | 707 PERF_SAMPLE_BRANCH_NO_CYCLES | 708 PERF_SAMPLE_BRANCH_NO_FLAGS | 709 PERF_SAMPLE_BRANCH_HW_INDEX; 710 } 711 } else 712 pr_warning("Cannot use LBR callstack with branch stack. " 713 "Falling back to framepointers.\n"); 714 } 715 716 if (param->record_mode == CALLCHAIN_DWARF) { 717 if (!function) { 718 evsel__set_sample_bit(evsel, REGS_USER); 719 evsel__set_sample_bit(evsel, STACK_USER); 720 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) { 721 attr->sample_regs_user |= DWARF_MINIMAL_REGS; 722 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 723 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 724 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 725 } else { 726 attr->sample_regs_user |= PERF_REGS_MASK; 727 } 728 attr->sample_stack_user = param->dump_size; 729 attr->exclude_callchain_user = 1; 730 } else { 731 pr_info("Cannot use DWARF unwind for function trace event," 732 " falling back to framepointers.\n"); 733 } 734 } 735 736 if (function) { 737 pr_info("Disabling user space callchains for function trace event.\n"); 738 attr->exclude_callchain_user = 1; 739 } 740 } 741 742 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts, 743 struct callchain_param *param) 744 { 745 if (param->enabled) 746 return __evsel__config_callchain(evsel, opts, param); 747 } 748 749 static void 750 perf_evsel__reset_callgraph(struct evsel *evsel, 751 struct callchain_param *param) 752 { 753 struct perf_event_attr *attr = &evsel->core.attr; 754 755 evsel__reset_sample_bit(evsel, CALLCHAIN); 756 if (param->record_mode == CALLCHAIN_LBR) { 757 evsel__reset_sample_bit(evsel, BRANCH_STACK); 758 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 759 PERF_SAMPLE_BRANCH_CALL_STACK | 760 PERF_SAMPLE_BRANCH_HW_INDEX); 761 } 762 if (param->record_mode == CALLCHAIN_DWARF) { 763 evsel__reset_sample_bit(evsel, REGS_USER); 764 evsel__reset_sample_bit(evsel, STACK_USER); 765 } 766 } 767 768 static void evsel__apply_config_terms(struct evsel *evsel, 769 struct record_opts *opts, bool track) 770 { 771 struct evsel_config_term *term; 772 struct list_head *config_terms = &evsel->config_terms; 773 struct perf_event_attr *attr = &evsel->core.attr; 774 /* callgraph default */ 775 struct callchain_param param = { 776 .record_mode = callchain_param.record_mode, 777 }; 778 u32 dump_size = 0; 779 int max_stack = 0; 780 const char *callgraph_buf = NULL; 781 782 list_for_each_entry(term, config_terms, list) { 783 switch (term->type) { 784 case EVSEL__CONFIG_TERM_PERIOD: 785 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 786 attr->sample_period = term->val.period; 787 attr->freq = 0; 788 evsel__reset_sample_bit(evsel, PERIOD); 789 } 790 break; 791 case EVSEL__CONFIG_TERM_FREQ: 792 if (!(term->weak && opts->user_freq != UINT_MAX)) { 793 attr->sample_freq = term->val.freq; 794 attr->freq = 1; 795 evsel__set_sample_bit(evsel, PERIOD); 796 } 797 break; 798 case EVSEL__CONFIG_TERM_TIME: 799 if (term->val.time) 800 evsel__set_sample_bit(evsel, TIME); 801 else 802 evsel__reset_sample_bit(evsel, TIME); 803 break; 804 case EVSEL__CONFIG_TERM_CALLGRAPH: 805 callgraph_buf = term->val.str; 806 break; 807 case EVSEL__CONFIG_TERM_BRANCH: 808 if (term->val.str && strcmp(term->val.str, "no")) { 809 evsel__set_sample_bit(evsel, BRANCH_STACK); 810 parse_branch_str(term->val.str, 811 &attr->branch_sample_type); 812 } else 813 evsel__reset_sample_bit(evsel, BRANCH_STACK); 814 break; 815 case EVSEL__CONFIG_TERM_STACK_USER: 816 dump_size = term->val.stack_user; 817 break; 818 case EVSEL__CONFIG_TERM_MAX_STACK: 819 max_stack = term->val.max_stack; 820 break; 821 case EVSEL__CONFIG_TERM_MAX_EVENTS: 822 evsel->max_events = term->val.max_events; 823 break; 824 case EVSEL__CONFIG_TERM_INHERIT: 825 /* 826 * attr->inherit should has already been set by 827 * evsel__config. If user explicitly set 828 * inherit using config terms, override global 829 * opt->no_inherit setting. 830 */ 831 attr->inherit = term->val.inherit ? 1 : 0; 832 break; 833 case EVSEL__CONFIG_TERM_OVERWRITE: 834 attr->write_backward = term->val.overwrite ? 1 : 0; 835 break; 836 case EVSEL__CONFIG_TERM_DRV_CFG: 837 break; 838 case EVSEL__CONFIG_TERM_PERCORE: 839 break; 840 case EVSEL__CONFIG_TERM_AUX_OUTPUT: 841 attr->aux_output = term->val.aux_output ? 1 : 0; 842 break; 843 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 844 /* Already applied by auxtrace */ 845 break; 846 case EVSEL__CONFIG_TERM_CFG_CHG: 847 break; 848 default: 849 break; 850 } 851 } 852 853 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 854 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 855 bool sample_address = false; 856 857 if (max_stack) { 858 param.max_stack = max_stack; 859 if (callgraph_buf == NULL) 860 callgraph_buf = "fp"; 861 } 862 863 /* parse callgraph parameters */ 864 if (callgraph_buf != NULL) { 865 if (!strcmp(callgraph_buf, "no")) { 866 param.enabled = false; 867 param.record_mode = CALLCHAIN_NONE; 868 } else { 869 param.enabled = true; 870 if (parse_callchain_record(callgraph_buf, ¶m)) { 871 pr_err("per-event callgraph setting for %s failed. " 872 "Apply callgraph global setting for it\n", 873 evsel->name); 874 return; 875 } 876 if (param.record_mode == CALLCHAIN_DWARF) 877 sample_address = true; 878 } 879 } 880 if (dump_size > 0) { 881 dump_size = round_up(dump_size, sizeof(u64)); 882 param.dump_size = dump_size; 883 } 884 885 /* If global callgraph set, clear it */ 886 if (callchain_param.enabled) 887 perf_evsel__reset_callgraph(evsel, &callchain_param); 888 889 /* set perf-event callgraph */ 890 if (param.enabled) { 891 if (sample_address) { 892 evsel__set_sample_bit(evsel, ADDR); 893 evsel__set_sample_bit(evsel, DATA_SRC); 894 evsel->core.attr.mmap_data = track; 895 } 896 evsel__config_callchain(evsel, opts, ¶m); 897 } 898 } 899 } 900 901 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type) 902 { 903 struct evsel_config_term *term, *found_term = NULL; 904 905 list_for_each_entry(term, &evsel->config_terms, list) { 906 if (term->type == type) 907 found_term = term; 908 } 909 910 return found_term; 911 } 912 913 /* 914 * The enable_on_exec/disabled value strategy: 915 * 916 * 1) For any type of traced program: 917 * - all independent events and group leaders are disabled 918 * - all group members are enabled 919 * 920 * Group members are ruled by group leaders. They need to 921 * be enabled, because the group scheduling relies on that. 922 * 923 * 2) For traced programs executed by perf: 924 * - all independent events and group leaders have 925 * enable_on_exec set 926 * - we don't specifically enable or disable any event during 927 * the record command 928 * 929 * Independent events and group leaders are initially disabled 930 * and get enabled by exec. Group members are ruled by group 931 * leaders as stated in 1). 932 * 933 * 3) For traced programs attached by perf (pid/tid): 934 * - we specifically enable or disable all events during 935 * the record command 936 * 937 * When attaching events to already running traced we 938 * enable/disable events specifically, as there's no 939 * initial traced exec call. 940 */ 941 void evsel__config(struct evsel *evsel, struct record_opts *opts, 942 struct callchain_param *callchain) 943 { 944 struct evsel *leader = evsel->leader; 945 struct perf_event_attr *attr = &evsel->core.attr; 946 int track = evsel->tracking; 947 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 948 949 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 950 attr->inherit = !opts->no_inherit; 951 attr->write_backward = opts->overwrite ? 1 : 0; 952 953 evsel__set_sample_bit(evsel, IP); 954 evsel__set_sample_bit(evsel, TID); 955 956 if (evsel->sample_read) { 957 evsel__set_sample_bit(evsel, READ); 958 959 /* 960 * We need ID even in case of single event, because 961 * PERF_SAMPLE_READ process ID specific data. 962 */ 963 evsel__set_sample_id(evsel, false); 964 965 /* 966 * Apply group format only if we belong to group 967 * with more than one members. 968 */ 969 if (leader->core.nr_members > 1) { 970 attr->read_format |= PERF_FORMAT_GROUP; 971 attr->inherit = 0; 972 } 973 } 974 975 /* 976 * We default some events to have a default interval. But keep 977 * it a weak assumption overridable by the user. 978 */ 979 if (!attr->sample_period) { 980 if (opts->freq) { 981 attr->freq = 1; 982 attr->sample_freq = opts->freq; 983 } else { 984 attr->sample_period = opts->default_interval; 985 } 986 } 987 /* 988 * If attr->freq was set (here or earlier), ask for period 989 * to be sampled. 990 */ 991 if (attr->freq) 992 evsel__set_sample_bit(evsel, PERIOD); 993 994 if (opts->no_samples) 995 attr->sample_freq = 0; 996 997 if (opts->inherit_stat) { 998 evsel->core.attr.read_format |= 999 PERF_FORMAT_TOTAL_TIME_ENABLED | 1000 PERF_FORMAT_TOTAL_TIME_RUNNING | 1001 PERF_FORMAT_ID; 1002 attr->inherit_stat = 1; 1003 } 1004 1005 if (opts->sample_address) { 1006 evsel__set_sample_bit(evsel, ADDR); 1007 attr->mmap_data = track; 1008 } 1009 1010 /* 1011 * We don't allow user space callchains for function trace 1012 * event, due to issues with page faults while tracing page 1013 * fault handler and its overall trickiness nature. 1014 */ 1015 if (evsel__is_function_event(evsel)) 1016 evsel->core.attr.exclude_callchain_user = 1; 1017 1018 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1019 evsel__config_callchain(evsel, opts, callchain); 1020 1021 if (opts->sample_intr_regs && !evsel->no_aux_samples && 1022 !evsel__is_dummy_event(evsel)) { 1023 attr->sample_regs_intr = opts->sample_intr_regs; 1024 evsel__set_sample_bit(evsel, REGS_INTR); 1025 } 1026 1027 if (opts->sample_user_regs && !evsel->no_aux_samples && 1028 !evsel__is_dummy_event(evsel)) { 1029 attr->sample_regs_user |= opts->sample_user_regs; 1030 evsel__set_sample_bit(evsel, REGS_USER); 1031 } 1032 1033 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1034 evsel__set_sample_bit(evsel, CPU); 1035 1036 /* 1037 * When the user explicitly disabled time don't force it here. 1038 */ 1039 if (opts->sample_time && 1040 (!perf_missing_features.sample_id_all && 1041 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1042 opts->sample_time_set))) 1043 evsel__set_sample_bit(evsel, TIME); 1044 1045 if (opts->raw_samples && !evsel->no_aux_samples) { 1046 evsel__set_sample_bit(evsel, TIME); 1047 evsel__set_sample_bit(evsel, RAW); 1048 evsel__set_sample_bit(evsel, CPU); 1049 } 1050 1051 if (opts->sample_address) 1052 evsel__set_sample_bit(evsel, DATA_SRC); 1053 1054 if (opts->sample_phys_addr) 1055 evsel__set_sample_bit(evsel, PHYS_ADDR); 1056 1057 if (opts->no_buffering) { 1058 attr->watermark = 0; 1059 attr->wakeup_events = 1; 1060 } 1061 if (opts->branch_stack && !evsel->no_aux_samples) { 1062 evsel__set_sample_bit(evsel, BRANCH_STACK); 1063 attr->branch_sample_type = opts->branch_stack; 1064 } 1065 1066 if (opts->sample_weight) 1067 evsel__set_sample_bit(evsel, WEIGHT); 1068 1069 attr->task = track; 1070 attr->mmap = track; 1071 attr->mmap2 = track && !perf_missing_features.mmap2; 1072 attr->comm = track; 1073 /* 1074 * ksymbol is tracked separately with text poke because it needs to be 1075 * system wide and enabled immediately. 1076 */ 1077 if (!opts->text_poke) 1078 attr->ksymbol = track && !perf_missing_features.ksymbol; 1079 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1080 1081 if (opts->record_namespaces) 1082 attr->namespaces = track; 1083 1084 if (opts->record_cgroup) { 1085 attr->cgroup = track && !perf_missing_features.cgroup; 1086 evsel__set_sample_bit(evsel, CGROUP); 1087 } 1088 1089 if (opts->record_switch_events) 1090 attr->context_switch = track; 1091 1092 if (opts->sample_transaction) 1093 evsel__set_sample_bit(evsel, TRANSACTION); 1094 1095 if (opts->running_time) { 1096 evsel->core.attr.read_format |= 1097 PERF_FORMAT_TOTAL_TIME_ENABLED | 1098 PERF_FORMAT_TOTAL_TIME_RUNNING; 1099 } 1100 1101 /* 1102 * XXX see the function comment above 1103 * 1104 * Disabling only independent events or group leaders, 1105 * keeping group members enabled. 1106 */ 1107 if (evsel__is_group_leader(evsel)) 1108 attr->disabled = 1; 1109 1110 /* 1111 * Setting enable_on_exec for independent events and 1112 * group leaders for traced executed by perf. 1113 */ 1114 if (target__none(&opts->target) && evsel__is_group_leader(evsel) && 1115 !opts->initial_delay) 1116 attr->enable_on_exec = 1; 1117 1118 if (evsel->immediate) { 1119 attr->disabled = 0; 1120 attr->enable_on_exec = 0; 1121 } 1122 1123 clockid = opts->clockid; 1124 if (opts->use_clockid) { 1125 attr->use_clockid = 1; 1126 attr->clockid = opts->clockid; 1127 } 1128 1129 if (evsel->precise_max) 1130 attr->precise_ip = 3; 1131 1132 if (opts->all_user) { 1133 attr->exclude_kernel = 1; 1134 attr->exclude_user = 0; 1135 } 1136 1137 if (opts->all_kernel) { 1138 attr->exclude_kernel = 0; 1139 attr->exclude_user = 1; 1140 } 1141 1142 if (evsel->core.own_cpus || evsel->unit) 1143 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1144 1145 /* 1146 * Apply event specific term settings, 1147 * it overloads any global configuration. 1148 */ 1149 evsel__apply_config_terms(evsel, opts, track); 1150 1151 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1152 1153 /* The --period option takes the precedence. */ 1154 if (opts->period_set) { 1155 if (opts->period) 1156 evsel__set_sample_bit(evsel, PERIOD); 1157 else 1158 evsel__reset_sample_bit(evsel, PERIOD); 1159 } 1160 1161 /* 1162 * A dummy event never triggers any actual counter and therefore 1163 * cannot be used with branch_stack. 1164 * 1165 * For initial_delay, a dummy event is added implicitly. 1166 * The software event will trigger -EOPNOTSUPP error out, 1167 * if BRANCH_STACK bit is set. 1168 */ 1169 if (evsel__is_dummy_event(evsel)) 1170 evsel__reset_sample_bit(evsel, BRANCH_STACK); 1171 } 1172 1173 int evsel__set_filter(struct evsel *evsel, const char *filter) 1174 { 1175 char *new_filter = strdup(filter); 1176 1177 if (new_filter != NULL) { 1178 free(evsel->filter); 1179 evsel->filter = new_filter; 1180 return 0; 1181 } 1182 1183 return -1; 1184 } 1185 1186 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter) 1187 { 1188 char *new_filter; 1189 1190 if (evsel->filter == NULL) 1191 return evsel__set_filter(evsel, filter); 1192 1193 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1194 free(evsel->filter); 1195 evsel->filter = new_filter; 1196 return 0; 1197 } 1198 1199 return -1; 1200 } 1201 1202 int evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1203 { 1204 return evsel__append_filter(evsel, "(%s) && (%s)", filter); 1205 } 1206 1207 int evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1208 { 1209 return evsel__append_filter(evsel, "%s,%s", filter); 1210 } 1211 1212 /* Caller has to clear disabled after going through all CPUs. */ 1213 int evsel__enable_cpu(struct evsel *evsel, int cpu) 1214 { 1215 return perf_evsel__enable_cpu(&evsel->core, cpu); 1216 } 1217 1218 int evsel__enable(struct evsel *evsel) 1219 { 1220 int err = perf_evsel__enable(&evsel->core); 1221 1222 if (!err) 1223 evsel->disabled = false; 1224 return err; 1225 } 1226 1227 /* Caller has to set disabled after going through all CPUs. */ 1228 int evsel__disable_cpu(struct evsel *evsel, int cpu) 1229 { 1230 return perf_evsel__disable_cpu(&evsel->core, cpu); 1231 } 1232 1233 int evsel__disable(struct evsel *evsel) 1234 { 1235 int err = perf_evsel__disable(&evsel->core); 1236 /* 1237 * We mark it disabled here so that tools that disable a event can 1238 * ignore events after they disable it. I.e. the ring buffer may have 1239 * already a few more events queued up before the kernel got the stop 1240 * request. 1241 */ 1242 if (!err) 1243 evsel->disabled = true; 1244 1245 return err; 1246 } 1247 1248 static void evsel__free_config_terms(struct evsel *evsel) 1249 { 1250 struct evsel_config_term *term, *h; 1251 1252 list_for_each_entry_safe(term, h, &evsel->config_terms, list) { 1253 list_del_init(&term->list); 1254 if (term->free_str) 1255 zfree(&term->val.str); 1256 free(term); 1257 } 1258 } 1259 1260 void evsel__exit(struct evsel *evsel) 1261 { 1262 assert(list_empty(&evsel->core.node)); 1263 assert(evsel->evlist == NULL); 1264 evsel__free_counts(evsel); 1265 perf_evsel__free_fd(&evsel->core); 1266 perf_evsel__free_id(&evsel->core); 1267 evsel__free_config_terms(evsel); 1268 cgroup__put(evsel->cgrp); 1269 perf_cpu_map__put(evsel->core.cpus); 1270 perf_cpu_map__put(evsel->core.own_cpus); 1271 perf_thread_map__put(evsel->core.threads); 1272 zfree(&evsel->group_name); 1273 zfree(&evsel->name); 1274 zfree(&evsel->pmu_name); 1275 zfree(&evsel->per_pkg_mask); 1276 zfree(&evsel->metric_events); 1277 perf_evsel__object.fini(evsel); 1278 } 1279 1280 void evsel__delete(struct evsel *evsel) 1281 { 1282 evsel__exit(evsel); 1283 free(evsel); 1284 } 1285 1286 void evsel__compute_deltas(struct evsel *evsel, int cpu, int thread, 1287 struct perf_counts_values *count) 1288 { 1289 struct perf_counts_values tmp; 1290 1291 if (!evsel->prev_raw_counts) 1292 return; 1293 1294 if (cpu == -1) { 1295 tmp = evsel->prev_raw_counts->aggr; 1296 evsel->prev_raw_counts->aggr = *count; 1297 } else { 1298 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread); 1299 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count; 1300 } 1301 1302 count->val = count->val - tmp.val; 1303 count->ena = count->ena - tmp.ena; 1304 count->run = count->run - tmp.run; 1305 } 1306 1307 void perf_counts_values__scale(struct perf_counts_values *count, 1308 bool scale, s8 *pscaled) 1309 { 1310 s8 scaled = 0; 1311 1312 if (scale) { 1313 if (count->run == 0) { 1314 scaled = -1; 1315 count->val = 0; 1316 } else if (count->run < count->ena) { 1317 scaled = 1; 1318 count->val = (u64)((double) count->val * count->ena / count->run); 1319 } 1320 } 1321 1322 if (pscaled) 1323 *pscaled = scaled; 1324 } 1325 1326 static int evsel__read_one(struct evsel *evsel, int cpu, int thread) 1327 { 1328 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread); 1329 1330 return perf_evsel__read(&evsel->core, cpu, thread, count); 1331 } 1332 1333 static void 1334 perf_evsel__set_count(struct evsel *counter, int cpu, int thread, 1335 u64 val, u64 ena, u64 run) 1336 { 1337 struct perf_counts_values *count; 1338 1339 count = perf_counts(counter->counts, cpu, thread); 1340 1341 count->val = val; 1342 count->ena = ena; 1343 count->run = run; 1344 1345 perf_counts__set_loaded(counter->counts, cpu, thread, true); 1346 } 1347 1348 static int 1349 perf_evsel__process_group_data(struct evsel *leader, 1350 int cpu, int thread, u64 *data) 1351 { 1352 u64 read_format = leader->core.attr.read_format; 1353 struct sample_read_value *v; 1354 u64 nr, ena = 0, run = 0, i; 1355 1356 nr = *data++; 1357 1358 if (nr != (u64) leader->core.nr_members) 1359 return -EINVAL; 1360 1361 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1362 ena = *data++; 1363 1364 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1365 run = *data++; 1366 1367 v = (struct sample_read_value *) data; 1368 1369 perf_evsel__set_count(leader, cpu, thread, 1370 v[0].value, ena, run); 1371 1372 for (i = 1; i < nr; i++) { 1373 struct evsel *counter; 1374 1375 counter = perf_evlist__id2evsel(leader->evlist, v[i].id); 1376 if (!counter) 1377 return -EINVAL; 1378 1379 perf_evsel__set_count(counter, cpu, thread, 1380 v[i].value, ena, run); 1381 } 1382 1383 return 0; 1384 } 1385 1386 static int evsel__read_group(struct evsel *leader, int cpu, int thread) 1387 { 1388 struct perf_stat_evsel *ps = leader->stats; 1389 u64 read_format = leader->core.attr.read_format; 1390 int size = perf_evsel__read_size(&leader->core); 1391 u64 *data = ps->group_data; 1392 1393 if (!(read_format & PERF_FORMAT_ID)) 1394 return -EINVAL; 1395 1396 if (!evsel__is_group_leader(leader)) 1397 return -EINVAL; 1398 1399 if (!data) { 1400 data = zalloc(size); 1401 if (!data) 1402 return -ENOMEM; 1403 1404 ps->group_data = data; 1405 } 1406 1407 if (FD(leader, cpu, thread) < 0) 1408 return -EINVAL; 1409 1410 if (readn(FD(leader, cpu, thread), data, size) <= 0) 1411 return -errno; 1412 1413 return perf_evsel__process_group_data(leader, cpu, thread, data); 1414 } 1415 1416 int evsel__read_counter(struct evsel *evsel, int cpu, int thread) 1417 { 1418 u64 read_format = evsel->core.attr.read_format; 1419 1420 if (read_format & PERF_FORMAT_GROUP) 1421 return evsel__read_group(evsel, cpu, thread); 1422 1423 return evsel__read_one(evsel, cpu, thread); 1424 } 1425 1426 int __evsel__read_on_cpu(struct evsel *evsel, int cpu, int thread, bool scale) 1427 { 1428 struct perf_counts_values count; 1429 size_t nv = scale ? 3 : 1; 1430 1431 if (FD(evsel, cpu, thread) < 0) 1432 return -EINVAL; 1433 1434 if (evsel->counts == NULL && evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0) 1435 return -ENOMEM; 1436 1437 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0) 1438 return -errno; 1439 1440 evsel__compute_deltas(evsel, cpu, thread, &count); 1441 perf_counts_values__scale(&count, scale, NULL); 1442 *perf_counts(evsel->counts, cpu, thread) = count; 1443 return 0; 1444 } 1445 1446 static int get_group_fd(struct evsel *evsel, int cpu, int thread) 1447 { 1448 struct evsel *leader = evsel->leader; 1449 int fd; 1450 1451 if (evsel__is_group_leader(evsel)) 1452 return -1; 1453 1454 /* 1455 * Leader must be already processed/open, 1456 * if not it's a bug. 1457 */ 1458 BUG_ON(!leader->core.fd); 1459 1460 fd = FD(leader, cpu, thread); 1461 BUG_ON(fd == -1); 1462 1463 return fd; 1464 } 1465 1466 static void perf_evsel__remove_fd(struct evsel *pos, 1467 int nr_cpus, int nr_threads, 1468 int thread_idx) 1469 { 1470 for (int cpu = 0; cpu < nr_cpus; cpu++) 1471 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1472 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1473 } 1474 1475 static int update_fds(struct evsel *evsel, 1476 int nr_cpus, int cpu_idx, 1477 int nr_threads, int thread_idx) 1478 { 1479 struct evsel *pos; 1480 1481 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads) 1482 return -EINVAL; 1483 1484 evlist__for_each_entry(evsel->evlist, pos) { 1485 nr_cpus = pos != evsel ? nr_cpus : cpu_idx; 1486 1487 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1488 1489 /* 1490 * Since fds for next evsel has not been created, 1491 * there is no need to iterate whole event list. 1492 */ 1493 if (pos == evsel) 1494 break; 1495 } 1496 return 0; 1497 } 1498 1499 static bool ignore_missing_thread(struct evsel *evsel, 1500 int nr_cpus, int cpu, 1501 struct perf_thread_map *threads, 1502 int thread, int err) 1503 { 1504 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1505 1506 if (!evsel->ignore_missing_thread) 1507 return false; 1508 1509 /* The system wide setup does not work with threads. */ 1510 if (evsel->core.system_wide) 1511 return false; 1512 1513 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1514 if (err != -ESRCH) 1515 return false; 1516 1517 /* If there's only one thread, let it fail. */ 1518 if (threads->nr == 1) 1519 return false; 1520 1521 /* 1522 * We should remove fd for missing_thread first 1523 * because thread_map__remove() will decrease threads->nr. 1524 */ 1525 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread)) 1526 return false; 1527 1528 if (thread_map__remove(threads, thread)) 1529 return false; 1530 1531 pr_warning("WARNING: Ignored open failure for pid %d\n", 1532 ignore_pid); 1533 return true; 1534 } 1535 1536 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1537 void *priv __maybe_unused) 1538 { 1539 return fprintf(fp, " %-32s %s\n", name, val); 1540 } 1541 1542 static void display_attr(struct perf_event_attr *attr) 1543 { 1544 if (verbose >= 2 || debug_peo_args) { 1545 fprintf(stderr, "%.60s\n", graph_dotted_line); 1546 fprintf(stderr, "perf_event_attr:\n"); 1547 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 1548 fprintf(stderr, "%.60s\n", graph_dotted_line); 1549 } 1550 } 1551 1552 static int perf_event_open(struct evsel *evsel, 1553 pid_t pid, int cpu, int group_fd, 1554 unsigned long flags) 1555 { 1556 int precise_ip = evsel->core.attr.precise_ip; 1557 int fd; 1558 1559 while (1) { 1560 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 1561 pid, cpu, group_fd, flags); 1562 1563 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags); 1564 if (fd >= 0) 1565 break; 1566 1567 /* Do not try less precise if not requested. */ 1568 if (!evsel->precise_max) 1569 break; 1570 1571 /* 1572 * We tried all the precise_ip values, and it's 1573 * still failing, so leave it to standard fallback. 1574 */ 1575 if (!evsel->core.attr.precise_ip) { 1576 evsel->core.attr.precise_ip = precise_ip; 1577 break; 1578 } 1579 1580 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", -ENOTSUP); 1581 evsel->core.attr.precise_ip--; 1582 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 1583 display_attr(&evsel->core.attr); 1584 } 1585 1586 return fd; 1587 } 1588 1589 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, 1590 struct perf_thread_map *threads, 1591 int start_cpu, int end_cpu) 1592 { 1593 int cpu, thread, nthreads; 1594 unsigned long flags = PERF_FLAG_FD_CLOEXEC; 1595 int pid = -1, err, old_errno; 1596 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE; 1597 1598 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 1599 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 1600 return -EINVAL; 1601 1602 if (cpus == NULL) { 1603 static struct perf_cpu_map *empty_cpu_map; 1604 1605 if (empty_cpu_map == NULL) { 1606 empty_cpu_map = perf_cpu_map__dummy_new(); 1607 if (empty_cpu_map == NULL) 1608 return -ENOMEM; 1609 } 1610 1611 cpus = empty_cpu_map; 1612 } 1613 1614 if (threads == NULL) { 1615 static struct perf_thread_map *empty_thread_map; 1616 1617 if (empty_thread_map == NULL) { 1618 empty_thread_map = thread_map__new_by_tid(-1); 1619 if (empty_thread_map == NULL) 1620 return -ENOMEM; 1621 } 1622 1623 threads = empty_thread_map; 1624 } 1625 1626 if (evsel->core.system_wide) 1627 nthreads = 1; 1628 else 1629 nthreads = threads->nr; 1630 1631 if (evsel->core.fd == NULL && 1632 perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0) 1633 return -ENOMEM; 1634 1635 if (evsel->cgrp) { 1636 flags |= PERF_FLAG_PID_CGROUP; 1637 pid = evsel->cgrp->fd; 1638 } 1639 1640 fallback_missing_features: 1641 if (perf_missing_features.clockid_wrong) 1642 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1643 if (perf_missing_features.clockid) { 1644 evsel->core.attr.use_clockid = 0; 1645 evsel->core.attr.clockid = 0; 1646 } 1647 if (perf_missing_features.cloexec) 1648 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1649 if (perf_missing_features.mmap2) 1650 evsel->core.attr.mmap2 = 0; 1651 if (perf_missing_features.exclude_guest) 1652 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 1653 if (perf_missing_features.lbr_flags) 1654 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 1655 PERF_SAMPLE_BRANCH_NO_CYCLES); 1656 if (perf_missing_features.group_read && evsel->core.attr.inherit) 1657 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 1658 if (perf_missing_features.ksymbol) 1659 evsel->core.attr.ksymbol = 0; 1660 if (perf_missing_features.bpf) 1661 evsel->core.attr.bpf_event = 0; 1662 if (perf_missing_features.branch_hw_idx) 1663 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX; 1664 retry_sample_id: 1665 if (perf_missing_features.sample_id_all) 1666 evsel->core.attr.sample_id_all = 0; 1667 1668 display_attr(&evsel->core.attr); 1669 1670 for (cpu = start_cpu; cpu < end_cpu; cpu++) { 1671 1672 for (thread = 0; thread < nthreads; thread++) { 1673 int fd, group_fd; 1674 1675 if (!evsel->cgrp && !evsel->core.system_wide) 1676 pid = perf_thread_map__pid(threads, thread); 1677 1678 group_fd = get_group_fd(evsel, cpu, thread); 1679 retry_open: 1680 test_attr__ready(); 1681 1682 fd = perf_event_open(evsel, pid, cpus->map[cpu], 1683 group_fd, flags); 1684 1685 FD(evsel, cpu, thread) = fd; 1686 1687 if (fd < 0) { 1688 err = -errno; 1689 1690 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) { 1691 /* 1692 * We just removed 1 thread, so take a step 1693 * back on thread index and lower the upper 1694 * nthreads limit. 1695 */ 1696 nthreads--; 1697 thread--; 1698 1699 /* ... and pretend like nothing have happened. */ 1700 err = 0; 1701 continue; 1702 } 1703 1704 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 1705 err); 1706 goto try_fallback; 1707 } 1708 1709 pr_debug2_peo(" = %d\n", fd); 1710 1711 if (evsel->bpf_fd >= 0) { 1712 int evt_fd = fd; 1713 int bpf_fd = evsel->bpf_fd; 1714 1715 err = ioctl(evt_fd, 1716 PERF_EVENT_IOC_SET_BPF, 1717 bpf_fd); 1718 if (err && errno != EEXIST) { 1719 pr_err("failed to attach bpf fd %d: %s\n", 1720 bpf_fd, strerror(errno)); 1721 err = -EINVAL; 1722 goto out_close; 1723 } 1724 } 1725 1726 set_rlimit = NO_CHANGE; 1727 1728 /* 1729 * If we succeeded but had to kill clockid, fail and 1730 * have evsel__open_strerror() print us a nice error. 1731 */ 1732 if (perf_missing_features.clockid || 1733 perf_missing_features.clockid_wrong) { 1734 err = -EINVAL; 1735 goto out_close; 1736 } 1737 } 1738 } 1739 1740 return 0; 1741 1742 try_fallback: 1743 /* 1744 * perf stat needs between 5 and 22 fds per CPU. When we run out 1745 * of them try to increase the limits. 1746 */ 1747 if (err == -EMFILE && set_rlimit < INCREASED_MAX) { 1748 struct rlimit l; 1749 1750 old_errno = errno; 1751 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 1752 if (set_rlimit == NO_CHANGE) 1753 l.rlim_cur = l.rlim_max; 1754 else { 1755 l.rlim_cur = l.rlim_max + 1000; 1756 l.rlim_max = l.rlim_cur; 1757 } 1758 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 1759 set_rlimit++; 1760 errno = old_errno; 1761 goto retry_open; 1762 } 1763 } 1764 errno = old_errno; 1765 } 1766 1767 if (err != -EINVAL || cpu > 0 || thread > 0) 1768 goto out_close; 1769 1770 /* 1771 * Must probe features in the order they were added to the 1772 * perf_event_attr interface. 1773 */ 1774 if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { 1775 perf_missing_features.cgroup = true; 1776 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); 1777 goto out_close; 1778 } else if (!perf_missing_features.branch_hw_idx && 1779 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { 1780 perf_missing_features.branch_hw_idx = true; 1781 pr_debug2("switching off branch HW index support\n"); 1782 goto fallback_missing_features; 1783 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 1784 perf_missing_features.aux_output = true; 1785 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); 1786 goto out_close; 1787 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 1788 perf_missing_features.bpf = true; 1789 pr_debug2_peo("switching off bpf_event\n"); 1790 goto fallback_missing_features; 1791 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 1792 perf_missing_features.ksymbol = true; 1793 pr_debug2_peo("switching off ksymbol\n"); 1794 goto fallback_missing_features; 1795 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 1796 perf_missing_features.write_backward = true; 1797 pr_debug2_peo("switching off write_backward\n"); 1798 goto out_close; 1799 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 1800 perf_missing_features.clockid_wrong = true; 1801 pr_debug2_peo("switching off clockid\n"); 1802 goto fallback_missing_features; 1803 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 1804 perf_missing_features.clockid = true; 1805 pr_debug2_peo("switching off use_clockid\n"); 1806 goto fallback_missing_features; 1807 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { 1808 perf_missing_features.cloexec = true; 1809 pr_debug2_peo("switching off cloexec flag\n"); 1810 goto fallback_missing_features; 1811 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 1812 perf_missing_features.mmap2 = true; 1813 pr_debug2_peo("switching off mmap2\n"); 1814 goto fallback_missing_features; 1815 } else if (!perf_missing_features.exclude_guest && 1816 (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) { 1817 perf_missing_features.exclude_guest = true; 1818 pr_debug2_peo("switching off exclude_guest, exclude_host\n"); 1819 goto fallback_missing_features; 1820 } else if (!perf_missing_features.sample_id_all) { 1821 perf_missing_features.sample_id_all = true; 1822 pr_debug2_peo("switching off sample_id_all\n"); 1823 goto retry_sample_id; 1824 } else if (!perf_missing_features.lbr_flags && 1825 (evsel->core.attr.branch_sample_type & 1826 (PERF_SAMPLE_BRANCH_NO_CYCLES | 1827 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 1828 perf_missing_features.lbr_flags = true; 1829 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 1830 goto fallback_missing_features; 1831 } else if (!perf_missing_features.group_read && 1832 evsel->core.attr.inherit && 1833 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 1834 evsel__is_group_leader(evsel)) { 1835 perf_missing_features.group_read = true; 1836 pr_debug2_peo("switching off group read\n"); 1837 goto fallback_missing_features; 1838 } 1839 out_close: 1840 if (err) 1841 threads->err_thread = thread; 1842 1843 old_errno = errno; 1844 do { 1845 while (--thread >= 0) { 1846 if (FD(evsel, cpu, thread) >= 0) 1847 close(FD(evsel, cpu, thread)); 1848 FD(evsel, cpu, thread) = -1; 1849 } 1850 thread = nthreads; 1851 } while (--cpu >= 0); 1852 errno = old_errno; 1853 return err; 1854 } 1855 1856 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 1857 struct perf_thread_map *threads) 1858 { 1859 return evsel__open_cpu(evsel, cpus, threads, 0, cpus ? cpus->nr : 1); 1860 } 1861 1862 void evsel__close(struct evsel *evsel) 1863 { 1864 perf_evsel__close(&evsel->core); 1865 perf_evsel__free_id(&evsel->core); 1866 } 1867 1868 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu) 1869 { 1870 if (cpu == -1) 1871 return evsel__open_cpu(evsel, cpus, NULL, 0, 1872 cpus ? cpus->nr : 1); 1873 1874 return evsel__open_cpu(evsel, cpus, NULL, cpu, cpu + 1); 1875 } 1876 1877 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads) 1878 { 1879 return evsel__open(evsel, NULL, threads); 1880 } 1881 1882 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 1883 const union perf_event *event, 1884 struct perf_sample *sample) 1885 { 1886 u64 type = evsel->core.attr.sample_type; 1887 const __u64 *array = event->sample.array; 1888 bool swapped = evsel->needs_swap; 1889 union u64_swap u; 1890 1891 array += ((event->header.size - 1892 sizeof(event->header)) / sizeof(u64)) - 1; 1893 1894 if (type & PERF_SAMPLE_IDENTIFIER) { 1895 sample->id = *array; 1896 array--; 1897 } 1898 1899 if (type & PERF_SAMPLE_CPU) { 1900 u.val64 = *array; 1901 if (swapped) { 1902 /* undo swap of u64, then swap on individual u32s */ 1903 u.val64 = bswap_64(u.val64); 1904 u.val32[0] = bswap_32(u.val32[0]); 1905 } 1906 1907 sample->cpu = u.val32[0]; 1908 array--; 1909 } 1910 1911 if (type & PERF_SAMPLE_STREAM_ID) { 1912 sample->stream_id = *array; 1913 array--; 1914 } 1915 1916 if (type & PERF_SAMPLE_ID) { 1917 sample->id = *array; 1918 array--; 1919 } 1920 1921 if (type & PERF_SAMPLE_TIME) { 1922 sample->time = *array; 1923 array--; 1924 } 1925 1926 if (type & PERF_SAMPLE_TID) { 1927 u.val64 = *array; 1928 if (swapped) { 1929 /* undo swap of u64, then swap on individual u32s */ 1930 u.val64 = bswap_64(u.val64); 1931 u.val32[0] = bswap_32(u.val32[0]); 1932 u.val32[1] = bswap_32(u.val32[1]); 1933 } 1934 1935 sample->pid = u.val32[0]; 1936 sample->tid = u.val32[1]; 1937 array--; 1938 } 1939 1940 return 0; 1941 } 1942 1943 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 1944 u64 size) 1945 { 1946 return size > max_size || offset + size > endp; 1947 } 1948 1949 #define OVERFLOW_CHECK(offset, size, max_size) \ 1950 do { \ 1951 if (overflow(endp, (max_size), (offset), (size))) \ 1952 return -EFAULT; \ 1953 } while (0) 1954 1955 #define OVERFLOW_CHECK_u64(offset) \ 1956 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 1957 1958 static int 1959 perf_event__check_size(union perf_event *event, unsigned int sample_size) 1960 { 1961 /* 1962 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 1963 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 1964 * check the format does not go past the end of the event. 1965 */ 1966 if (sample_size + sizeof(event->header) > event->header.size) 1967 return -EFAULT; 1968 1969 return 0; 1970 } 1971 1972 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, 1973 struct perf_sample *data) 1974 { 1975 u64 type = evsel->core.attr.sample_type; 1976 bool swapped = evsel->needs_swap; 1977 const __u64 *array; 1978 u16 max_size = event->header.size; 1979 const void *endp = (void *)event + max_size; 1980 u64 sz; 1981 1982 /* 1983 * used for cross-endian analysis. See git commit 65014ab3 1984 * for why this goofiness is needed. 1985 */ 1986 union u64_swap u; 1987 1988 memset(data, 0, sizeof(*data)); 1989 data->cpu = data->pid = data->tid = -1; 1990 data->stream_id = data->id = data->time = -1ULL; 1991 data->period = evsel->core.attr.sample_period; 1992 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 1993 data->misc = event->header.misc; 1994 data->id = -1ULL; 1995 data->data_src = PERF_MEM_DATA_SRC_NONE; 1996 1997 if (event->header.type != PERF_RECORD_SAMPLE) { 1998 if (!evsel->core.attr.sample_id_all) 1999 return 0; 2000 return perf_evsel__parse_id_sample(evsel, event, data); 2001 } 2002 2003 array = event->sample.array; 2004 2005 if (perf_event__check_size(event, evsel->sample_size)) 2006 return -EFAULT; 2007 2008 if (type & PERF_SAMPLE_IDENTIFIER) { 2009 data->id = *array; 2010 array++; 2011 } 2012 2013 if (type & PERF_SAMPLE_IP) { 2014 data->ip = *array; 2015 array++; 2016 } 2017 2018 if (type & PERF_SAMPLE_TID) { 2019 u.val64 = *array; 2020 if (swapped) { 2021 /* undo swap of u64, then swap on individual u32s */ 2022 u.val64 = bswap_64(u.val64); 2023 u.val32[0] = bswap_32(u.val32[0]); 2024 u.val32[1] = bswap_32(u.val32[1]); 2025 } 2026 2027 data->pid = u.val32[0]; 2028 data->tid = u.val32[1]; 2029 array++; 2030 } 2031 2032 if (type & PERF_SAMPLE_TIME) { 2033 data->time = *array; 2034 array++; 2035 } 2036 2037 if (type & PERF_SAMPLE_ADDR) { 2038 data->addr = *array; 2039 array++; 2040 } 2041 2042 if (type & PERF_SAMPLE_ID) { 2043 data->id = *array; 2044 array++; 2045 } 2046 2047 if (type & PERF_SAMPLE_STREAM_ID) { 2048 data->stream_id = *array; 2049 array++; 2050 } 2051 2052 if (type & PERF_SAMPLE_CPU) { 2053 2054 u.val64 = *array; 2055 if (swapped) { 2056 /* undo swap of u64, then swap on individual u32s */ 2057 u.val64 = bswap_64(u.val64); 2058 u.val32[0] = bswap_32(u.val32[0]); 2059 } 2060 2061 data->cpu = u.val32[0]; 2062 array++; 2063 } 2064 2065 if (type & PERF_SAMPLE_PERIOD) { 2066 data->period = *array; 2067 array++; 2068 } 2069 2070 if (type & PERF_SAMPLE_READ) { 2071 u64 read_format = evsel->core.attr.read_format; 2072 2073 OVERFLOW_CHECK_u64(array); 2074 if (read_format & PERF_FORMAT_GROUP) 2075 data->read.group.nr = *array; 2076 else 2077 data->read.one.value = *array; 2078 2079 array++; 2080 2081 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2082 OVERFLOW_CHECK_u64(array); 2083 data->read.time_enabled = *array; 2084 array++; 2085 } 2086 2087 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2088 OVERFLOW_CHECK_u64(array); 2089 data->read.time_running = *array; 2090 array++; 2091 } 2092 2093 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2094 if (read_format & PERF_FORMAT_GROUP) { 2095 const u64 max_group_nr = UINT64_MAX / 2096 sizeof(struct sample_read_value); 2097 2098 if (data->read.group.nr > max_group_nr) 2099 return -EFAULT; 2100 sz = data->read.group.nr * 2101 sizeof(struct sample_read_value); 2102 OVERFLOW_CHECK(array, sz, max_size); 2103 data->read.group.values = 2104 (struct sample_read_value *)array; 2105 array = (void *)array + sz; 2106 } else { 2107 OVERFLOW_CHECK_u64(array); 2108 data->read.one.id = *array; 2109 array++; 2110 } 2111 } 2112 2113 if (type & PERF_SAMPLE_CALLCHAIN) { 2114 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2115 2116 OVERFLOW_CHECK_u64(array); 2117 data->callchain = (struct ip_callchain *)array++; 2118 if (data->callchain->nr > max_callchain_nr) 2119 return -EFAULT; 2120 sz = data->callchain->nr * sizeof(u64); 2121 OVERFLOW_CHECK(array, sz, max_size); 2122 array = (void *)array + sz; 2123 } 2124 2125 if (type & PERF_SAMPLE_RAW) { 2126 OVERFLOW_CHECK_u64(array); 2127 u.val64 = *array; 2128 2129 /* 2130 * Undo swap of u64, then swap on individual u32s, 2131 * get the size of the raw area and undo all of the 2132 * swap. The pevent interface handles endianity by 2133 * itself. 2134 */ 2135 if (swapped) { 2136 u.val64 = bswap_64(u.val64); 2137 u.val32[0] = bswap_32(u.val32[0]); 2138 u.val32[1] = bswap_32(u.val32[1]); 2139 } 2140 data->raw_size = u.val32[0]; 2141 2142 /* 2143 * The raw data is aligned on 64bits including the 2144 * u32 size, so it's safe to use mem_bswap_64. 2145 */ 2146 if (swapped) 2147 mem_bswap_64((void *) array, data->raw_size); 2148 2149 array = (void *)array + sizeof(u32); 2150 2151 OVERFLOW_CHECK(array, data->raw_size, max_size); 2152 data->raw_data = (void *)array; 2153 array = (void *)array + data->raw_size; 2154 } 2155 2156 if (type & PERF_SAMPLE_BRANCH_STACK) { 2157 const u64 max_branch_nr = UINT64_MAX / 2158 sizeof(struct branch_entry); 2159 2160 OVERFLOW_CHECK_u64(array); 2161 data->branch_stack = (struct branch_stack *)array++; 2162 2163 if (data->branch_stack->nr > max_branch_nr) 2164 return -EFAULT; 2165 2166 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2167 if (evsel__has_branch_hw_idx(evsel)) 2168 sz += sizeof(u64); 2169 else 2170 data->no_hw_idx = true; 2171 OVERFLOW_CHECK(array, sz, max_size); 2172 array = (void *)array + sz; 2173 } 2174 2175 if (type & PERF_SAMPLE_REGS_USER) { 2176 OVERFLOW_CHECK_u64(array); 2177 data->user_regs.abi = *array; 2178 array++; 2179 2180 if (data->user_regs.abi) { 2181 u64 mask = evsel->core.attr.sample_regs_user; 2182 2183 sz = hweight64(mask) * sizeof(u64); 2184 OVERFLOW_CHECK(array, sz, max_size); 2185 data->user_regs.mask = mask; 2186 data->user_regs.regs = (u64 *)array; 2187 array = (void *)array + sz; 2188 } 2189 } 2190 2191 if (type & PERF_SAMPLE_STACK_USER) { 2192 OVERFLOW_CHECK_u64(array); 2193 sz = *array++; 2194 2195 data->user_stack.offset = ((char *)(array - 1) 2196 - (char *) event); 2197 2198 if (!sz) { 2199 data->user_stack.size = 0; 2200 } else { 2201 OVERFLOW_CHECK(array, sz, max_size); 2202 data->user_stack.data = (char *)array; 2203 array = (void *)array + sz; 2204 OVERFLOW_CHECK_u64(array); 2205 data->user_stack.size = *array++; 2206 if (WARN_ONCE(data->user_stack.size > sz, 2207 "user stack dump failure\n")) 2208 return -EFAULT; 2209 } 2210 } 2211 2212 if (type & PERF_SAMPLE_WEIGHT) { 2213 OVERFLOW_CHECK_u64(array); 2214 data->weight = *array; 2215 array++; 2216 } 2217 2218 if (type & PERF_SAMPLE_DATA_SRC) { 2219 OVERFLOW_CHECK_u64(array); 2220 data->data_src = *array; 2221 array++; 2222 } 2223 2224 if (type & PERF_SAMPLE_TRANSACTION) { 2225 OVERFLOW_CHECK_u64(array); 2226 data->transaction = *array; 2227 array++; 2228 } 2229 2230 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2231 if (type & PERF_SAMPLE_REGS_INTR) { 2232 OVERFLOW_CHECK_u64(array); 2233 data->intr_regs.abi = *array; 2234 array++; 2235 2236 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2237 u64 mask = evsel->core.attr.sample_regs_intr; 2238 2239 sz = hweight64(mask) * sizeof(u64); 2240 OVERFLOW_CHECK(array, sz, max_size); 2241 data->intr_regs.mask = mask; 2242 data->intr_regs.regs = (u64 *)array; 2243 array = (void *)array + sz; 2244 } 2245 } 2246 2247 data->phys_addr = 0; 2248 if (type & PERF_SAMPLE_PHYS_ADDR) { 2249 data->phys_addr = *array; 2250 array++; 2251 } 2252 2253 data->cgroup = 0; 2254 if (type & PERF_SAMPLE_CGROUP) { 2255 data->cgroup = *array; 2256 array++; 2257 } 2258 2259 if (type & PERF_SAMPLE_AUX) { 2260 OVERFLOW_CHECK_u64(array); 2261 sz = *array++; 2262 2263 OVERFLOW_CHECK(array, sz, max_size); 2264 /* Undo swap of data */ 2265 if (swapped) 2266 mem_bswap_64((char *)array, sz); 2267 data->aux_sample.size = sz; 2268 data->aux_sample.data = (char *)array; 2269 array = (void *)array + sz; 2270 } 2271 2272 return 0; 2273 } 2274 2275 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event, 2276 u64 *timestamp) 2277 { 2278 u64 type = evsel->core.attr.sample_type; 2279 const __u64 *array; 2280 2281 if (!(type & PERF_SAMPLE_TIME)) 2282 return -1; 2283 2284 if (event->header.type != PERF_RECORD_SAMPLE) { 2285 struct perf_sample data = { 2286 .time = -1ULL, 2287 }; 2288 2289 if (!evsel->core.attr.sample_id_all) 2290 return -1; 2291 if (perf_evsel__parse_id_sample(evsel, event, &data)) 2292 return -1; 2293 2294 *timestamp = data.time; 2295 return 0; 2296 } 2297 2298 array = event->sample.array; 2299 2300 if (perf_event__check_size(event, evsel->sample_size)) 2301 return -EFAULT; 2302 2303 if (type & PERF_SAMPLE_IDENTIFIER) 2304 array++; 2305 2306 if (type & PERF_SAMPLE_IP) 2307 array++; 2308 2309 if (type & PERF_SAMPLE_TID) 2310 array++; 2311 2312 if (type & PERF_SAMPLE_TIME) 2313 *timestamp = *array; 2314 2315 return 0; 2316 } 2317 2318 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name) 2319 { 2320 return tep_find_field(evsel->tp_format, name); 2321 } 2322 2323 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name) 2324 { 2325 struct tep_format_field *field = evsel__field(evsel, name); 2326 int offset; 2327 2328 if (!field) 2329 return NULL; 2330 2331 offset = field->offset; 2332 2333 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 2334 offset = *(int *)(sample->raw_data + field->offset); 2335 offset &= 0xffff; 2336 } 2337 2338 return sample->raw_data + offset; 2339 } 2340 2341 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 2342 bool needs_swap) 2343 { 2344 u64 value; 2345 void *ptr = sample->raw_data + field->offset; 2346 2347 switch (field->size) { 2348 case 1: 2349 return *(u8 *)ptr; 2350 case 2: 2351 value = *(u16 *)ptr; 2352 break; 2353 case 4: 2354 value = *(u32 *)ptr; 2355 break; 2356 case 8: 2357 memcpy(&value, ptr, sizeof(u64)); 2358 break; 2359 default: 2360 return 0; 2361 } 2362 2363 if (!needs_swap) 2364 return value; 2365 2366 switch (field->size) { 2367 case 2: 2368 return bswap_16(value); 2369 case 4: 2370 return bswap_32(value); 2371 case 8: 2372 return bswap_64(value); 2373 default: 2374 return 0; 2375 } 2376 2377 return 0; 2378 } 2379 2380 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name) 2381 { 2382 struct tep_format_field *field = evsel__field(evsel, name); 2383 2384 if (!field) 2385 return 0; 2386 2387 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 2388 } 2389 2390 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize) 2391 { 2392 int paranoid; 2393 2394 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2395 evsel->core.attr.type == PERF_TYPE_HARDWARE && 2396 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2397 /* 2398 * If it's cycles then fall back to hrtimer based 2399 * cpu-clock-tick sw counter, which is always available even if 2400 * no PMU support. 2401 * 2402 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2403 * b0a873e). 2404 */ 2405 scnprintf(msg, msgsize, "%s", 2406 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2407 2408 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 2409 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK; 2410 2411 zfree(&evsel->name); 2412 return true; 2413 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 2414 (paranoid = perf_event_paranoid()) > 1) { 2415 const char *name = evsel__name(evsel); 2416 char *new_name; 2417 const char *sep = ":"; 2418 2419 /* If event has exclude user then don't exclude kernel. */ 2420 if (evsel->core.attr.exclude_user) 2421 return false; 2422 2423 /* Is there already the separator in the name. */ 2424 if (strchr(name, '/') || 2425 (strchr(name, ':') && !evsel->is_libpfm_event)) 2426 sep = ""; 2427 2428 if (asprintf(&new_name, "%s%su", name, sep) < 0) 2429 return false; 2430 2431 if (evsel->name) 2432 free(evsel->name); 2433 evsel->name = new_name; 2434 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 2435 "to fall back to excluding kernel and hypervisor " 2436 " samples", paranoid); 2437 evsel->core.attr.exclude_kernel = 1; 2438 evsel->core.attr.exclude_hv = 1; 2439 2440 return true; 2441 } 2442 2443 return false; 2444 } 2445 2446 static bool find_process(const char *name) 2447 { 2448 size_t len = strlen(name); 2449 DIR *dir; 2450 struct dirent *d; 2451 int ret = -1; 2452 2453 dir = opendir(procfs__mountpoint()); 2454 if (!dir) 2455 return false; 2456 2457 /* Walk through the directory. */ 2458 while (ret && (d = readdir(dir)) != NULL) { 2459 char path[PATH_MAX]; 2460 char *data; 2461 size_t size; 2462 2463 if ((d->d_type != DT_DIR) || 2464 !strcmp(".", d->d_name) || 2465 !strcmp("..", d->d_name)) 2466 continue; 2467 2468 scnprintf(path, sizeof(path), "%s/%s/comm", 2469 procfs__mountpoint(), d->d_name); 2470 2471 if (filename__read_str(path, &data, &size)) 2472 continue; 2473 2474 ret = strncmp(name, data, len); 2475 free(data); 2476 } 2477 2478 closedir(dir); 2479 return ret ? false : true; 2480 } 2481 2482 int evsel__open_strerror(struct evsel *evsel, struct target *target, 2483 int err, char *msg, size_t size) 2484 { 2485 char sbuf[STRERR_BUFSIZE]; 2486 int printed = 0, enforced = 0; 2487 2488 switch (err) { 2489 case EPERM: 2490 case EACCES: 2491 printed += scnprintf(msg + printed, size - printed, 2492 "Access to performance monitoring and observability operations is limited.\n"); 2493 2494 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) { 2495 if (enforced) { 2496 printed += scnprintf(msg + printed, size - printed, 2497 "Enforced MAC policy settings (SELinux) can limit access to performance\n" 2498 "monitoring and observability operations. Inspect system audit records for\n" 2499 "more perf_event access control information and adjusting the policy.\n"); 2500 } 2501 } 2502 2503 if (err == EPERM) 2504 printed += scnprintf(msg, size, 2505 "No permission to enable %s event.\n\n", evsel__name(evsel)); 2506 2507 return scnprintf(msg + printed, size - printed, 2508 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" 2509 "access to performance monitoring and observability operations for processes\n" 2510 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" 2511 "More information can be found at 'Perf events and tool security' document:\n" 2512 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" 2513 "perf_event_paranoid setting is %d:\n" 2514 " -1: Allow use of (almost) all events by all users\n" 2515 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 2516 ">= 0: Disallow raw and ftrace function tracepoint access\n" 2517 ">= 1: Disallow CPU event access\n" 2518 ">= 2: Disallow kernel profiling\n" 2519 "To make the adjusted perf_event_paranoid setting permanent preserve it\n" 2520 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)", 2521 perf_event_paranoid()); 2522 case ENOENT: 2523 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel)); 2524 case EMFILE: 2525 return scnprintf(msg, size, "%s", 2526 "Too many events are opened.\n" 2527 "Probably the maximum number of open file descriptors has been reached.\n" 2528 "Hint: Try again after reducing the number of events.\n" 2529 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 2530 case ENOMEM: 2531 if (evsel__has_callchain(evsel) && 2532 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 2533 return scnprintf(msg, size, 2534 "Not enough memory to setup event with callchain.\n" 2535 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 2536 "Hint: Current value: %d", sysctl__max_stack()); 2537 break; 2538 case ENODEV: 2539 if (target->cpu_list) 2540 return scnprintf(msg, size, "%s", 2541 "No such device - did you specify an out-of-range profile CPU?"); 2542 break; 2543 case EOPNOTSUPP: 2544 if (evsel->core.attr.aux_output) 2545 return scnprintf(msg, size, 2546 "%s: PMU Hardware doesn't support 'aux_output' feature", 2547 evsel__name(evsel)); 2548 if (evsel->core.attr.sample_period != 0) 2549 return scnprintf(msg, size, 2550 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 2551 evsel__name(evsel)); 2552 if (evsel->core.attr.precise_ip) 2553 return scnprintf(msg, size, "%s", 2554 "\'precise\' request may not be supported. Try removing 'p' modifier."); 2555 #if defined(__i386__) || defined(__x86_64__) 2556 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 2557 return scnprintf(msg, size, "%s", 2558 "No hardware sampling interrupt available.\n"); 2559 #endif 2560 break; 2561 case EBUSY: 2562 if (find_process("oprofiled")) 2563 return scnprintf(msg, size, 2564 "The PMU counters are busy/taken by another profiler.\n" 2565 "We found oprofile daemon running, please stop it and try again."); 2566 break; 2567 case EINVAL: 2568 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 2569 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 2570 if (perf_missing_features.clockid) 2571 return scnprintf(msg, size, "clockid feature not supported."); 2572 if (perf_missing_features.clockid_wrong) 2573 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 2574 if (perf_missing_features.aux_output) 2575 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 2576 break; 2577 default: 2578 break; 2579 } 2580 2581 return scnprintf(msg, size, 2582 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 2583 "/bin/dmesg | grep -i perf may provide additional information.\n", 2584 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel)); 2585 } 2586 2587 struct perf_env *evsel__env(struct evsel *evsel) 2588 { 2589 if (evsel && evsel->evlist) 2590 return evsel->evlist->env; 2591 return &perf_env; 2592 } 2593 2594 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 2595 { 2596 int cpu, thread; 2597 2598 for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) { 2599 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 2600 thread++) { 2601 int fd = FD(evsel, cpu, thread); 2602 2603 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 2604 cpu, thread, fd) < 0) 2605 return -1; 2606 } 2607 } 2608 2609 return 0; 2610 } 2611 2612 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 2613 { 2614 struct perf_cpu_map *cpus = evsel->core.cpus; 2615 struct perf_thread_map *threads = evsel->core.threads; 2616 2617 if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr)) 2618 return -ENOMEM; 2619 2620 return store_evsel_ids(evsel, evlist); 2621 } 2622