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