1/* 2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 3 * 4 * Parts came from builtin-{top,stat,record}.c, see those files for further 5 * copyright notes. 6 * 7 * Released under the GPL v2. (and only v2, not any later version) 8 */ 9 10#include <byteswap.h> 11#include <linux/bitops.h> 12#include <api/fs/debugfs.h> 13#include <traceevent/event-parse.h> 14#include <linux/hw_breakpoint.h> 15#include <linux/perf_event.h> 16#include <sys/resource.h> 17#include "asm/bug.h" 18#include "callchain.h" 19#include "cgroup.h" 20#include "evsel.h" 21#include "evlist.h" 22#include "util.h" 23#include "cpumap.h" 24#include "thread_map.h" 25#include "target.h" 26#include "perf_regs.h" 27#include "debug.h" 28#include "trace-event.h" 29 30static struct { 31 bool sample_id_all; 32 bool exclude_guest; 33 bool mmap2; 34 bool cloexec; 35 bool clockid; 36 bool clockid_wrong; 37} perf_missing_features; 38 39static clockid_t clockid; 40 41static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused) 42{ 43 return 0; 44} 45 46static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused) 47{ 48} 49 50static struct { 51 size_t size; 52 int (*init)(struct perf_evsel *evsel); 53 void (*fini)(struct perf_evsel *evsel); 54} perf_evsel__object = { 55 .size = sizeof(struct perf_evsel), 56 .init = perf_evsel__no_extra_init, 57 .fini = perf_evsel__no_extra_fini, 58}; 59 60int perf_evsel__object_config(size_t object_size, 61 int (*init)(struct perf_evsel *evsel), 62 void (*fini)(struct perf_evsel *evsel)) 63{ 64 65 if (object_size == 0) 66 goto set_methods; 67 68 if (perf_evsel__object.size > object_size) 69 return -EINVAL; 70 71 perf_evsel__object.size = object_size; 72 73set_methods: 74 if (init != NULL) 75 perf_evsel__object.init = init; 76 77 if (fini != NULL) 78 perf_evsel__object.fini = fini; 79 80 return 0; 81} 82 83#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) 84 85int __perf_evsel__sample_size(u64 sample_type) 86{ 87 u64 mask = sample_type & PERF_SAMPLE_MASK; 88 int size = 0; 89 int i; 90 91 for (i = 0; i < 64; i++) { 92 if (mask & (1ULL << i)) 93 size++; 94 } 95 96 size *= sizeof(u64); 97 98 return size; 99} 100 101/** 102 * __perf_evsel__calc_id_pos - calculate id_pos. 103 * @sample_type: sample type 104 * 105 * This function returns the position of the event id (PERF_SAMPLE_ID or 106 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 107 * sample_event. 108 */ 109static int __perf_evsel__calc_id_pos(u64 sample_type) 110{ 111 int idx = 0; 112 113 if (sample_type & PERF_SAMPLE_IDENTIFIER) 114 return 0; 115 116 if (!(sample_type & PERF_SAMPLE_ID)) 117 return -1; 118 119 if (sample_type & PERF_SAMPLE_IP) 120 idx += 1; 121 122 if (sample_type & PERF_SAMPLE_TID) 123 idx += 1; 124 125 if (sample_type & PERF_SAMPLE_TIME) 126 idx += 1; 127 128 if (sample_type & PERF_SAMPLE_ADDR) 129 idx += 1; 130 131 return idx; 132} 133 134/** 135 * __perf_evsel__calc_is_pos - calculate is_pos. 136 * @sample_type: sample type 137 * 138 * This function returns the position (counting backwards) of the event id 139 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 140 * sample_id_all is used there is an id sample appended to non-sample events. 141 */ 142static int __perf_evsel__calc_is_pos(u64 sample_type) 143{ 144 int idx = 1; 145 146 if (sample_type & PERF_SAMPLE_IDENTIFIER) 147 return 1; 148 149 if (!(sample_type & PERF_SAMPLE_ID)) 150 return -1; 151 152 if (sample_type & PERF_SAMPLE_CPU) 153 idx += 1; 154 155 if (sample_type & PERF_SAMPLE_STREAM_ID) 156 idx += 1; 157 158 return idx; 159} 160 161void perf_evsel__calc_id_pos(struct perf_evsel *evsel) 162{ 163 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type); 164 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type); 165} 166 167void __perf_evsel__set_sample_bit(struct perf_evsel *evsel, 168 enum perf_event_sample_format bit) 169{ 170 if (!(evsel->attr.sample_type & bit)) { 171 evsel->attr.sample_type |= bit; 172 evsel->sample_size += sizeof(u64); 173 perf_evsel__calc_id_pos(evsel); 174 } 175} 176 177void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel, 178 enum perf_event_sample_format bit) 179{ 180 if (evsel->attr.sample_type & bit) { 181 evsel->attr.sample_type &= ~bit; 182 evsel->sample_size -= sizeof(u64); 183 perf_evsel__calc_id_pos(evsel); 184 } 185} 186 187void perf_evsel__set_sample_id(struct perf_evsel *evsel, 188 bool can_sample_identifier) 189{ 190 if (can_sample_identifier) { 191 perf_evsel__reset_sample_bit(evsel, ID); 192 perf_evsel__set_sample_bit(evsel, IDENTIFIER); 193 } else { 194 perf_evsel__set_sample_bit(evsel, ID); 195 } 196 evsel->attr.read_format |= PERF_FORMAT_ID; 197} 198 199void perf_evsel__init(struct perf_evsel *evsel, 200 struct perf_event_attr *attr, int idx) 201{ 202 evsel->idx = idx; 203 evsel->tracking = !idx; 204 evsel->attr = *attr; 205 evsel->leader = evsel; 206 evsel->unit = ""; 207 evsel->scale = 1.0; 208 INIT_LIST_HEAD(&evsel->node); 209 perf_evsel__object.init(evsel); 210 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type); 211 perf_evsel__calc_id_pos(evsel); 212} 213 214struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx) 215{ 216 struct perf_evsel *evsel = zalloc(perf_evsel__object.size); 217 218 if (evsel != NULL) 219 perf_evsel__init(evsel, attr, idx); 220 221 return evsel; 222} 223 224struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx) 225{ 226 struct perf_evsel *evsel = zalloc(perf_evsel__object.size); 227 228 if (evsel != NULL) { 229 struct perf_event_attr attr = { 230 .type = PERF_TYPE_TRACEPOINT, 231 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 232 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 233 }; 234 235 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 236 goto out_free; 237 238 evsel->tp_format = trace_event__tp_format(sys, name); 239 if (evsel->tp_format == NULL) 240 goto out_free; 241 242 event_attr_init(&attr); 243 attr.config = evsel->tp_format->id; 244 attr.sample_period = 1; 245 perf_evsel__init(evsel, &attr, idx); 246 } 247 248 return evsel; 249 250out_free: 251 zfree(&evsel->name); 252 free(evsel); 253 return NULL; 254} 255 256const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = { 257 "cycles", 258 "instructions", 259 "cache-references", 260 "cache-misses", 261 "branches", 262 "branch-misses", 263 "bus-cycles", 264 "stalled-cycles-frontend", 265 "stalled-cycles-backend", 266 "ref-cycles", 267}; 268 269static const char *__perf_evsel__hw_name(u64 config) 270{ 271 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config]) 272 return perf_evsel__hw_names[config]; 273 274 return "unknown-hardware"; 275} 276 277static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size) 278{ 279 int colon = 0, r = 0; 280 struct perf_event_attr *attr = &evsel->attr; 281 bool exclude_guest_default = false; 282 283#define MOD_PRINT(context, mod) do { \ 284 if (!attr->exclude_##context) { \ 285 if (!colon) colon = ++r; \ 286 r += scnprintf(bf + r, size - r, "%c", mod); \ 287 } } while(0) 288 289 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 290 MOD_PRINT(kernel, 'k'); 291 MOD_PRINT(user, 'u'); 292 MOD_PRINT(hv, 'h'); 293 exclude_guest_default = true; 294 } 295 296 if (attr->precise_ip) { 297 if (!colon) 298 colon = ++r; 299 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 300 exclude_guest_default = true; 301 } 302 303 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 304 MOD_PRINT(host, 'H'); 305 MOD_PRINT(guest, 'G'); 306 } 307#undef MOD_PRINT 308 if (colon) 309 bf[colon - 1] = ':'; 310 return r; 311} 312 313static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size) 314{ 315 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config)); 316 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 317} 318 319const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = { 320 "cpu-clock", 321 "task-clock", 322 "page-faults", 323 "context-switches", 324 "cpu-migrations", 325 "minor-faults", 326 "major-faults", 327 "alignment-faults", 328 "emulation-faults", 329 "dummy", 330}; 331 332static const char *__perf_evsel__sw_name(u64 config) 333{ 334 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config]) 335 return perf_evsel__sw_names[config]; 336 return "unknown-software"; 337} 338 339static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size) 340{ 341 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config)); 342 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 343} 344 345static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 346{ 347 int r; 348 349 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 350 351 if (type & HW_BREAKPOINT_R) 352 r += scnprintf(bf + r, size - r, "r"); 353 354 if (type & HW_BREAKPOINT_W) 355 r += scnprintf(bf + r, size - r, "w"); 356 357 if (type & HW_BREAKPOINT_X) 358 r += scnprintf(bf + r, size - r, "x"); 359 360 return r; 361} 362 363static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size) 364{ 365 struct perf_event_attr *attr = &evsel->attr; 366 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 367 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 368} 369 370const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX] 371 [PERF_EVSEL__MAX_ALIASES] = { 372 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 373 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 374 { "LLC", "L2", }, 375 { "dTLB", "d-tlb", "Data-TLB", }, 376 { "iTLB", "i-tlb", "Instruction-TLB", }, 377 { "branch", "branches", "bpu", "btb", "bpc", }, 378 { "node", }, 379}; 380 381const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX] 382 [PERF_EVSEL__MAX_ALIASES] = { 383 { "load", "loads", "read", }, 384 { "store", "stores", "write", }, 385 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 386}; 387 388const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX] 389 [PERF_EVSEL__MAX_ALIASES] = { 390 { "refs", "Reference", "ops", "access", }, 391 { "misses", "miss", }, 392}; 393 394#define C(x) PERF_COUNT_HW_CACHE_##x 395#define CACHE_READ (1 << C(OP_READ)) 396#define CACHE_WRITE (1 << C(OP_WRITE)) 397#define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 398#define COP(x) (1 << x) 399 400/* 401 * cache operartion stat 402 * L1I : Read and prefetch only 403 * ITLB and BPU : Read-only 404 */ 405static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = { 406 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 407 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 408 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 409 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 410 [C(ITLB)] = (CACHE_READ), 411 [C(BPU)] = (CACHE_READ), 412 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 413}; 414 415bool perf_evsel__is_cache_op_valid(u8 type, u8 op) 416{ 417 if (perf_evsel__hw_cache_stat[type] & COP(op)) 418 return true; /* valid */ 419 else 420 return false; /* invalid */ 421} 422 423int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, 424 char *bf, size_t size) 425{ 426 if (result) { 427 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0], 428 perf_evsel__hw_cache_op[op][0], 429 perf_evsel__hw_cache_result[result][0]); 430 } 431 432 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0], 433 perf_evsel__hw_cache_op[op][1]); 434} 435 436static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size) 437{ 438 u8 op, result, type = (config >> 0) & 0xff; 439 const char *err = "unknown-ext-hardware-cache-type"; 440 441 if (type > PERF_COUNT_HW_CACHE_MAX) 442 goto out_err; 443 444 op = (config >> 8) & 0xff; 445 err = "unknown-ext-hardware-cache-op"; 446 if (op > PERF_COUNT_HW_CACHE_OP_MAX) 447 goto out_err; 448 449 result = (config >> 16) & 0xff; 450 err = "unknown-ext-hardware-cache-result"; 451 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX) 452 goto out_err; 453 454 err = "invalid-cache"; 455 if (!perf_evsel__is_cache_op_valid(type, op)) 456 goto out_err; 457 458 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 459out_err: 460 return scnprintf(bf, size, "%s", err); 461} 462 463static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size) 464{ 465 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size); 466 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 467} 468 469static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size) 470{ 471 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config); 472 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 473} 474 475const char *perf_evsel__name(struct perf_evsel *evsel) 476{ 477 char bf[128]; 478 479 if (evsel->name) 480 return evsel->name; 481 482 switch (evsel->attr.type) { 483 case PERF_TYPE_RAW: 484 perf_evsel__raw_name(evsel, bf, sizeof(bf)); 485 break; 486 487 case PERF_TYPE_HARDWARE: 488 perf_evsel__hw_name(evsel, bf, sizeof(bf)); 489 break; 490 491 case PERF_TYPE_HW_CACHE: 492 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf)); 493 break; 494 495 case PERF_TYPE_SOFTWARE: 496 perf_evsel__sw_name(evsel, bf, sizeof(bf)); 497 break; 498 499 case PERF_TYPE_TRACEPOINT: 500 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 501 break; 502 503 case PERF_TYPE_BREAKPOINT: 504 perf_evsel__bp_name(evsel, bf, sizeof(bf)); 505 break; 506 507 default: 508 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 509 evsel->attr.type); 510 break; 511 } 512 513 evsel->name = strdup(bf); 514 515 return evsel->name ?: "unknown"; 516} 517 518const char *perf_evsel__group_name(struct perf_evsel *evsel) 519{ 520 return evsel->group_name ?: "anon group"; 521} 522 523int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size) 524{ 525 int ret; 526 struct perf_evsel *pos; 527 const char *group_name = perf_evsel__group_name(evsel); 528 529 ret = scnprintf(buf, size, "%s", group_name); 530 531 ret += scnprintf(buf + ret, size - ret, " { %s", 532 perf_evsel__name(evsel)); 533 534 for_each_group_member(pos, evsel) 535 ret += scnprintf(buf + ret, size - ret, ", %s", 536 perf_evsel__name(pos)); 537 538 ret += scnprintf(buf + ret, size - ret, " }"); 539 540 return ret; 541} 542 543static void 544perf_evsel__config_callgraph(struct perf_evsel *evsel, 545 struct record_opts *opts) 546{ 547 bool function = perf_evsel__is_function_event(evsel); 548 struct perf_event_attr *attr = &evsel->attr; 549 550 perf_evsel__set_sample_bit(evsel, CALLCHAIN); 551 552 if (callchain_param.record_mode == CALLCHAIN_LBR) { 553 if (!opts->branch_stack) { 554 if (attr->exclude_user) { 555 pr_warning("LBR callstack option is only available " 556 "to get user callchain information. " 557 "Falling back to framepointers.\n"); 558 } else { 559 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 560 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 561 PERF_SAMPLE_BRANCH_CALL_STACK; 562 } 563 } else 564 pr_warning("Cannot use LBR callstack with branch stack. " 565 "Falling back to framepointers.\n"); 566 } 567 568 if (callchain_param.record_mode == CALLCHAIN_DWARF) { 569 if (!function) { 570 perf_evsel__set_sample_bit(evsel, REGS_USER); 571 perf_evsel__set_sample_bit(evsel, STACK_USER); 572 attr->sample_regs_user = PERF_REGS_MASK; 573 attr->sample_stack_user = callchain_param.dump_size; 574 attr->exclude_callchain_user = 1; 575 } else { 576 pr_info("Cannot use DWARF unwind for function trace event," 577 " falling back to framepointers.\n"); 578 } 579 } 580 581 if (function) { 582 pr_info("Disabling user space callchains for function trace event.\n"); 583 attr->exclude_callchain_user = 1; 584 } 585} 586 587/* 588 * The enable_on_exec/disabled value strategy: 589 * 590 * 1) For any type of traced program: 591 * - all independent events and group leaders are disabled 592 * - all group members are enabled 593 * 594 * Group members are ruled by group leaders. They need to 595 * be enabled, because the group scheduling relies on that. 596 * 597 * 2) For traced programs executed by perf: 598 * - all independent events and group leaders have 599 * enable_on_exec set 600 * - we don't specifically enable or disable any event during 601 * the record command 602 * 603 * Independent events and group leaders are initially disabled 604 * and get enabled by exec. Group members are ruled by group 605 * leaders as stated in 1). 606 * 607 * 3) For traced programs attached by perf (pid/tid): 608 * - we specifically enable or disable all events during 609 * the record command 610 * 611 * When attaching events to already running traced we 612 * enable/disable events specifically, as there's no 613 * initial traced exec call. 614 */ 615void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) 616{ 617 struct perf_evsel *leader = evsel->leader; 618 struct perf_event_attr *attr = &evsel->attr; 619 int track = evsel->tracking; 620 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 621 622 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 623 attr->inherit = !opts->no_inherit; 624 625 perf_evsel__set_sample_bit(evsel, IP); 626 perf_evsel__set_sample_bit(evsel, TID); 627 628 if (evsel->sample_read) { 629 perf_evsel__set_sample_bit(evsel, READ); 630 631 /* 632 * We need ID even in case of single event, because 633 * PERF_SAMPLE_READ process ID specific data. 634 */ 635 perf_evsel__set_sample_id(evsel, false); 636 637 /* 638 * Apply group format only if we belong to group 639 * with more than one members. 640 */ 641 if (leader->nr_members > 1) { 642 attr->read_format |= PERF_FORMAT_GROUP; 643 attr->inherit = 0; 644 } 645 } 646 647 /* 648 * We default some events to have a default interval. But keep 649 * it a weak assumption overridable by the user. 650 */ 651 if (!attr->sample_period || (opts->user_freq != UINT_MAX || 652 opts->user_interval != ULLONG_MAX)) { 653 if (opts->freq) { 654 perf_evsel__set_sample_bit(evsel, PERIOD); 655 attr->freq = 1; 656 attr->sample_freq = opts->freq; 657 } else { 658 attr->sample_period = opts->default_interval; 659 } 660 } 661 662 /* 663 * Disable sampling for all group members other 664 * than leader in case leader 'leads' the sampling. 665 */ 666 if ((leader != evsel) && leader->sample_read) { 667 attr->sample_freq = 0; 668 attr->sample_period = 0; 669 } 670 671 if (opts->no_samples) 672 attr->sample_freq = 0; 673 674 if (opts->inherit_stat) 675 attr->inherit_stat = 1; 676 677 if (opts->sample_address) { 678 perf_evsel__set_sample_bit(evsel, ADDR); 679 attr->mmap_data = track; 680 } 681 682 /* 683 * We don't allow user space callchains for function trace 684 * event, due to issues with page faults while tracing page 685 * fault handler and its overall trickiness nature. 686 */ 687 if (perf_evsel__is_function_event(evsel)) 688 evsel->attr.exclude_callchain_user = 1; 689 690 if (callchain_param.enabled && !evsel->no_aux_samples) 691 perf_evsel__config_callgraph(evsel, opts); 692 693 if (opts->sample_intr_regs) { 694 attr->sample_regs_intr = PERF_REGS_MASK; 695 perf_evsel__set_sample_bit(evsel, REGS_INTR); 696 } 697 698 if (target__has_cpu(&opts->target)) 699 perf_evsel__set_sample_bit(evsel, CPU); 700 701 if (opts->period) 702 perf_evsel__set_sample_bit(evsel, PERIOD); 703 704 /* 705 * When the user explicitely disabled time don't force it here. 706 */ 707 if (opts->sample_time && 708 (!perf_missing_features.sample_id_all && 709 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu))) 710 perf_evsel__set_sample_bit(evsel, TIME); 711 712 if (opts->raw_samples && !evsel->no_aux_samples) { 713 perf_evsel__set_sample_bit(evsel, TIME); 714 perf_evsel__set_sample_bit(evsel, RAW); 715 perf_evsel__set_sample_bit(evsel, CPU); 716 } 717 718 if (opts->sample_address) 719 perf_evsel__set_sample_bit(evsel, DATA_SRC); 720 721 if (opts->no_buffering) { 722 attr->watermark = 0; 723 attr->wakeup_events = 1; 724 } 725 if (opts->branch_stack && !evsel->no_aux_samples) { 726 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 727 attr->branch_sample_type = opts->branch_stack; 728 } 729 730 if (opts->sample_weight) 731 perf_evsel__set_sample_bit(evsel, WEIGHT); 732 733 attr->task = track; 734 attr->mmap = track; 735 attr->mmap2 = track && !perf_missing_features.mmap2; 736 attr->comm = track; 737 738 if (opts->sample_transaction) 739 perf_evsel__set_sample_bit(evsel, TRANSACTION); 740 741 if (opts->running_time) { 742 evsel->attr.read_format |= 743 PERF_FORMAT_TOTAL_TIME_ENABLED | 744 PERF_FORMAT_TOTAL_TIME_RUNNING; 745 } 746 747 /* 748 * XXX see the function comment above 749 * 750 * Disabling only independent events or group leaders, 751 * keeping group members enabled. 752 */ 753 if (perf_evsel__is_group_leader(evsel)) 754 attr->disabled = 1; 755 756 /* 757 * Setting enable_on_exec for independent events and 758 * group leaders for traced executed by perf. 759 */ 760 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) && 761 !opts->initial_delay) 762 attr->enable_on_exec = 1; 763 764 if (evsel->immediate) { 765 attr->disabled = 0; 766 attr->enable_on_exec = 0; 767 } 768 769 clockid = opts->clockid; 770 if (opts->use_clockid) { 771 attr->use_clockid = 1; 772 attr->clockid = opts->clockid; 773 } 774} 775 776static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads) 777{ 778 int cpu, thread; 779 780 if (evsel->system_wide) 781 nthreads = 1; 782 783 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int)); 784 785 if (evsel->fd) { 786 for (cpu = 0; cpu < ncpus; cpu++) { 787 for (thread = 0; thread < nthreads; thread++) { 788 FD(evsel, cpu, thread) = -1; 789 } 790 } 791 } 792 793 return evsel->fd != NULL ? 0 : -ENOMEM; 794} 795 796static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads, 797 int ioc, void *arg) 798{ 799 int cpu, thread; 800 801 if (evsel->system_wide) 802 nthreads = 1; 803 804 for (cpu = 0; cpu < ncpus; cpu++) { 805 for (thread = 0; thread < nthreads; thread++) { 806 int fd = FD(evsel, cpu, thread), 807 err = ioctl(fd, ioc, arg); 808 809 if (err) 810 return err; 811 } 812 } 813 814 return 0; 815} 816 817int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads, 818 const char *filter) 819{ 820 return perf_evsel__run_ioctl(evsel, ncpus, nthreads, 821 PERF_EVENT_IOC_SET_FILTER, 822 (void *)filter); 823} 824 825int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads) 826{ 827 return perf_evsel__run_ioctl(evsel, ncpus, nthreads, 828 PERF_EVENT_IOC_ENABLE, 829 0); 830} 831 832int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads) 833{ 834 if (ncpus == 0 || nthreads == 0) 835 return 0; 836 837 if (evsel->system_wide) 838 nthreads = 1; 839 840 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id)); 841 if (evsel->sample_id == NULL) 842 return -ENOMEM; 843 844 evsel->id = zalloc(ncpus * nthreads * sizeof(u64)); 845 if (evsel->id == NULL) { 846 xyarray__delete(evsel->sample_id); 847 evsel->sample_id = NULL; 848 return -ENOMEM; 849 } 850 851 return 0; 852} 853 854void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus) 855{ 856 memset(evsel->counts, 0, (sizeof(*evsel->counts) + 857 (ncpus * sizeof(struct perf_counts_values)))); 858} 859 860int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus) 861{ 862 evsel->counts = zalloc((sizeof(*evsel->counts) + 863 (ncpus * sizeof(struct perf_counts_values)))); 864 return evsel->counts != NULL ? 0 : -ENOMEM; 865} 866 867static void perf_evsel__free_fd(struct perf_evsel *evsel) 868{ 869 xyarray__delete(evsel->fd); 870 evsel->fd = NULL; 871} 872 873static void perf_evsel__free_id(struct perf_evsel *evsel) 874{ 875 xyarray__delete(evsel->sample_id); 876 evsel->sample_id = NULL; 877 zfree(&evsel->id); 878} 879 880void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads) 881{ 882 int cpu, thread; 883 884 if (evsel->system_wide) 885 nthreads = 1; 886 887 for (cpu = 0; cpu < ncpus; cpu++) 888 for (thread = 0; thread < nthreads; ++thread) { 889 close(FD(evsel, cpu, thread)); 890 FD(evsel, cpu, thread) = -1; 891 } 892} 893 894void perf_evsel__free_counts(struct perf_evsel *evsel) 895{ 896 zfree(&evsel->counts); 897} 898 899void perf_evsel__exit(struct perf_evsel *evsel) 900{ 901 assert(list_empty(&evsel->node)); 902 perf_evsel__free_fd(evsel); 903 perf_evsel__free_id(evsel); 904 close_cgroup(evsel->cgrp); 905 zfree(&evsel->group_name); 906 zfree(&evsel->name); 907 perf_evsel__object.fini(evsel); 908} 909 910void perf_evsel__delete(struct perf_evsel *evsel) 911{ 912 perf_evsel__exit(evsel); 913 free(evsel); 914} 915 916void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, 917 struct perf_counts_values *count) 918{ 919 struct perf_counts_values tmp; 920 921 if (!evsel->prev_raw_counts) 922 return; 923 924 if (cpu == -1) { 925 tmp = evsel->prev_raw_counts->aggr; 926 evsel->prev_raw_counts->aggr = *count; 927 } else { 928 tmp = evsel->prev_raw_counts->cpu[cpu]; 929 evsel->prev_raw_counts->cpu[cpu] = *count; 930 } 931 932 count->val = count->val - tmp.val; 933 count->ena = count->ena - tmp.ena; 934 count->run = count->run - tmp.run; 935} 936 937void perf_counts_values__scale(struct perf_counts_values *count, 938 bool scale, s8 *pscaled) 939{ 940 s8 scaled = 0; 941 942 if (scale) { 943 if (count->run == 0) { 944 scaled = -1; 945 count->val = 0; 946 } else if (count->run < count->ena) { 947 scaled = 1; 948 count->val = (u64)((double) count->val * count->ena / count->run + 0.5); 949 } 950 } else 951 count->ena = count->run = 0; 952 953 if (pscaled) 954 *pscaled = scaled; 955} 956 957int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread, 958 perf_evsel__read_cb_t cb) 959{ 960 struct perf_counts_values count; 961 962 memset(&count, 0, sizeof(count)); 963 964 if (FD(evsel, cpu, thread) < 0) 965 return -EINVAL; 966 967 if (readn(FD(evsel, cpu, thread), &count, sizeof(count)) < 0) 968 return -errno; 969 970 return cb(evsel, cpu, thread, &count); 971} 972 973int __perf_evsel__read_on_cpu(struct perf_evsel *evsel, 974 int cpu, int thread, bool scale) 975{ 976 struct perf_counts_values count; 977 size_t nv = scale ? 3 : 1; 978 979 if (FD(evsel, cpu, thread) < 0) 980 return -EINVAL; 981 982 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0) 983 return -ENOMEM; 984 985 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0) 986 return -errno; 987 988 perf_evsel__compute_deltas(evsel, cpu, &count); 989 perf_counts_values__scale(&count, scale, NULL); 990 evsel->counts->cpu[cpu] = count; 991 return 0; 992} 993 994static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread) 995{ 996 struct perf_evsel *leader = evsel->leader; 997 int fd; 998 999 if (perf_evsel__is_group_leader(evsel)) 1000 return -1; 1001 1002 /* 1003 * Leader must be already processed/open, 1004 * if not it's a bug. 1005 */ 1006 BUG_ON(!leader->fd); 1007 1008 fd = FD(leader, cpu, thread); 1009 BUG_ON(fd == -1); 1010 1011 return fd; 1012} 1013 1014struct bit_names { 1015 int bit; 1016 const char *name; 1017}; 1018 1019static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits) 1020{ 1021 bool first_bit = true; 1022 int i = 0; 1023 1024 do { 1025 if (value & bits[i].bit) { 1026 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name); 1027 first_bit = false; 1028 } 1029 } while (bits[++i].name != NULL); 1030} 1031 1032static void __p_sample_type(char *buf, size_t size, u64 value) 1033{ 1034#define bit_name(n) { PERF_SAMPLE_##n, #n } 1035 struct bit_names bits[] = { 1036 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR), 1037 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU), 1038 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW), 1039 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER), 1040 bit_name(IDENTIFIER), bit_name(REGS_INTR), 1041 { .name = NULL, } 1042 }; 1043#undef bit_name 1044 __p_bits(buf, size, value, bits); 1045} 1046 1047static void __p_read_format(char *buf, size_t size, u64 value) 1048{ 1049#define bit_name(n) { PERF_FORMAT_##n, #n } 1050 struct bit_names bits[] = { 1051 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING), 1052 bit_name(ID), bit_name(GROUP), 1053 { .name = NULL, } 1054 }; 1055#undef bit_name 1056 __p_bits(buf, size, value, bits); 1057} 1058 1059#define BUF_SIZE 1024 1060 1061#define p_hex(val) snprintf(buf, BUF_SIZE, "%"PRIx64, (uint64_t)(val)) 1062#define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val)) 1063#define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val)) 1064#define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val) 1065#define p_read_format(val) __p_read_format(buf, BUF_SIZE, val) 1066 1067#define PRINT_ATTRn(_n, _f, _p) \ 1068do { \ 1069 if (attr->_f) { \ 1070 _p(attr->_f); \ 1071 ret += attr__fprintf(fp, _n, buf, priv);\ 1072 } \ 1073} while (0) 1074 1075#define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p) 1076 1077int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr, 1078 attr__fprintf_f attr__fprintf, void *priv) 1079{ 1080 char buf[BUF_SIZE]; 1081 int ret = 0; 1082 1083 PRINT_ATTRf(type, p_unsigned); 1084 PRINT_ATTRf(size, p_unsigned); 1085 PRINT_ATTRf(config, p_hex); 1086 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned); 1087 PRINT_ATTRf(sample_type, p_sample_type); 1088 PRINT_ATTRf(read_format, p_read_format); 1089 1090 PRINT_ATTRf(disabled, p_unsigned); 1091 PRINT_ATTRf(inherit, p_unsigned); 1092 PRINT_ATTRf(pinned, p_unsigned); 1093 PRINT_ATTRf(exclusive, p_unsigned); 1094 PRINT_ATTRf(exclude_user, p_unsigned); 1095 PRINT_ATTRf(exclude_kernel, p_unsigned); 1096 PRINT_ATTRf(exclude_hv, p_unsigned); 1097 PRINT_ATTRf(exclude_idle, p_unsigned); 1098 PRINT_ATTRf(mmap, p_unsigned); 1099 PRINT_ATTRf(comm, p_unsigned); 1100 PRINT_ATTRf(freq, p_unsigned); 1101 PRINT_ATTRf(inherit_stat, p_unsigned); 1102 PRINT_ATTRf(enable_on_exec, p_unsigned); 1103 PRINT_ATTRf(task, p_unsigned); 1104 PRINT_ATTRf(watermark, p_unsigned); 1105 PRINT_ATTRf(precise_ip, p_unsigned); 1106 PRINT_ATTRf(mmap_data, p_unsigned); 1107 PRINT_ATTRf(sample_id_all, p_unsigned); 1108 PRINT_ATTRf(exclude_host, p_unsigned); 1109 PRINT_ATTRf(exclude_guest, p_unsigned); 1110 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned); 1111 PRINT_ATTRf(exclude_callchain_user, p_unsigned); 1112 PRINT_ATTRf(mmap2, p_unsigned); 1113 PRINT_ATTRf(comm_exec, p_unsigned); 1114 PRINT_ATTRf(use_clockid, p_unsigned); 1115 1116 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned); 1117 PRINT_ATTRf(bp_type, p_unsigned); 1118 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex); 1119 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex); 1120 PRINT_ATTRf(sample_regs_user, p_hex); 1121 PRINT_ATTRf(sample_stack_user, p_unsigned); 1122 PRINT_ATTRf(clockid, p_signed); 1123 PRINT_ATTRf(sample_regs_intr, p_hex); 1124 1125 return ret; 1126} 1127 1128static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1129 void *priv __attribute__((unused))) 1130{ 1131 return fprintf(fp, " %-32s %s\n", name, val); 1132} 1133 1134static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, 1135 struct thread_map *threads) 1136{ 1137 int cpu, thread, nthreads; 1138 unsigned long flags = PERF_FLAG_FD_CLOEXEC; 1139 int pid = -1, err; 1140 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE; 1141 1142 if (evsel->system_wide) 1143 nthreads = 1; 1144 else 1145 nthreads = threads->nr; 1146 1147 if (evsel->fd == NULL && 1148 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0) 1149 return -ENOMEM; 1150 1151 if (evsel->cgrp) { 1152 flags |= PERF_FLAG_PID_CGROUP; 1153 pid = evsel->cgrp->fd; 1154 } 1155 1156fallback_missing_features: 1157 if (perf_missing_features.clockid_wrong) 1158 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1159 if (perf_missing_features.clockid) { 1160 evsel->attr.use_clockid = 0; 1161 evsel->attr.clockid = 0; 1162 } 1163 if (perf_missing_features.cloexec) 1164 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1165 if (perf_missing_features.mmap2) 1166 evsel->attr.mmap2 = 0; 1167 if (perf_missing_features.exclude_guest) 1168 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0; 1169retry_sample_id: 1170 if (perf_missing_features.sample_id_all) 1171 evsel->attr.sample_id_all = 0; 1172 1173 if (verbose >= 2) { 1174 fprintf(stderr, "%.60s\n", graph_dotted_line); 1175 fprintf(stderr, "perf_event_attr:\n"); 1176 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL); 1177 fprintf(stderr, "%.60s\n", graph_dotted_line); 1178 } 1179 1180 for (cpu = 0; cpu < cpus->nr; cpu++) { 1181 1182 for (thread = 0; thread < nthreads; thread++) { 1183 int group_fd; 1184 1185 if (!evsel->cgrp && !evsel->system_wide) 1186 pid = threads->map[thread]; 1187 1188 group_fd = get_group_fd(evsel, cpu, thread); 1189retry_open: 1190 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n", 1191 pid, cpus->map[cpu], group_fd, flags); 1192 1193 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr, 1194 pid, 1195 cpus->map[cpu], 1196 group_fd, flags); 1197 if (FD(evsel, cpu, thread) < 0) { 1198 err = -errno; 1199 pr_debug2("sys_perf_event_open failed, error %d\n", 1200 err); 1201 goto try_fallback; 1202 } 1203 set_rlimit = NO_CHANGE; 1204 1205 /* 1206 * If we succeeded but had to kill clockid, fail and 1207 * have perf_evsel__open_strerror() print us a nice 1208 * error. 1209 */ 1210 if (perf_missing_features.clockid || 1211 perf_missing_features.clockid_wrong) { 1212 err = -EINVAL; 1213 goto out_close; 1214 } 1215 } 1216 } 1217 1218 return 0; 1219 1220try_fallback: 1221 /* 1222 * perf stat needs between 5 and 22 fds per CPU. When we run out 1223 * of them try to increase the limits. 1224 */ 1225 if (err == -EMFILE && set_rlimit < INCREASED_MAX) { 1226 struct rlimit l; 1227 int old_errno = errno; 1228 1229 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 1230 if (set_rlimit == NO_CHANGE) 1231 l.rlim_cur = l.rlim_max; 1232 else { 1233 l.rlim_cur = l.rlim_max + 1000; 1234 l.rlim_max = l.rlim_cur; 1235 } 1236 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 1237 set_rlimit++; 1238 errno = old_errno; 1239 goto retry_open; 1240 } 1241 } 1242 errno = old_errno; 1243 } 1244 1245 if (err != -EINVAL || cpu > 0 || thread > 0) 1246 goto out_close; 1247 1248 /* 1249 * Must probe features in the order they were added to the 1250 * perf_event_attr interface. 1251 */ 1252 if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) { 1253 perf_missing_features.clockid_wrong = true; 1254 goto fallback_missing_features; 1255 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) { 1256 perf_missing_features.clockid = true; 1257 goto fallback_missing_features; 1258 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { 1259 perf_missing_features.cloexec = true; 1260 goto fallback_missing_features; 1261 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) { 1262 perf_missing_features.mmap2 = true; 1263 goto fallback_missing_features; 1264 } else if (!perf_missing_features.exclude_guest && 1265 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) { 1266 perf_missing_features.exclude_guest = true; 1267 goto fallback_missing_features; 1268 } else if (!perf_missing_features.sample_id_all) { 1269 perf_missing_features.sample_id_all = true; 1270 goto retry_sample_id; 1271 } 1272 1273out_close: 1274 do { 1275 while (--thread >= 0) { 1276 close(FD(evsel, cpu, thread)); 1277 FD(evsel, cpu, thread) = -1; 1278 } 1279 thread = nthreads; 1280 } while (--cpu >= 0); 1281 return err; 1282} 1283 1284void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads) 1285{ 1286 if (evsel->fd == NULL) 1287 return; 1288 1289 perf_evsel__close_fd(evsel, ncpus, nthreads); 1290 perf_evsel__free_fd(evsel); 1291} 1292 1293static struct { 1294 struct cpu_map map; 1295 int cpus[1]; 1296} empty_cpu_map = { 1297 .map.nr = 1, 1298 .cpus = { -1, }, 1299}; 1300 1301static struct { 1302 struct thread_map map; 1303 int threads[1]; 1304} empty_thread_map = { 1305 .map.nr = 1, 1306 .threads = { -1, }, 1307}; 1308 1309int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, 1310 struct thread_map *threads) 1311{ 1312 if (cpus == NULL) { 1313 /* Work around old compiler warnings about strict aliasing */ 1314 cpus = &empty_cpu_map.map; 1315 } 1316 1317 if (threads == NULL) 1318 threads = &empty_thread_map.map; 1319 1320 return __perf_evsel__open(evsel, cpus, threads); 1321} 1322 1323int perf_evsel__open_per_cpu(struct perf_evsel *evsel, 1324 struct cpu_map *cpus) 1325{ 1326 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map); 1327} 1328 1329int perf_evsel__open_per_thread(struct perf_evsel *evsel, 1330 struct thread_map *threads) 1331{ 1332 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads); 1333} 1334 1335static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel, 1336 const union perf_event *event, 1337 struct perf_sample *sample) 1338{ 1339 u64 type = evsel->attr.sample_type; 1340 const u64 *array = event->sample.array; 1341 bool swapped = evsel->needs_swap; 1342 union u64_swap u; 1343 1344 array += ((event->header.size - 1345 sizeof(event->header)) / sizeof(u64)) - 1; 1346 1347 if (type & PERF_SAMPLE_IDENTIFIER) { 1348 sample->id = *array; 1349 array--; 1350 } 1351 1352 if (type & PERF_SAMPLE_CPU) { 1353 u.val64 = *array; 1354 if (swapped) { 1355 /* undo swap of u64, then swap on individual u32s */ 1356 u.val64 = bswap_64(u.val64); 1357 u.val32[0] = bswap_32(u.val32[0]); 1358 } 1359 1360 sample->cpu = u.val32[0]; 1361 array--; 1362 } 1363 1364 if (type & PERF_SAMPLE_STREAM_ID) { 1365 sample->stream_id = *array; 1366 array--; 1367 } 1368 1369 if (type & PERF_SAMPLE_ID) { 1370 sample->id = *array; 1371 array--; 1372 } 1373 1374 if (type & PERF_SAMPLE_TIME) { 1375 sample->time = *array; 1376 array--; 1377 } 1378 1379 if (type & PERF_SAMPLE_TID) { 1380 u.val64 = *array; 1381 if (swapped) { 1382 /* undo swap of u64, then swap on individual u32s */ 1383 u.val64 = bswap_64(u.val64); 1384 u.val32[0] = bswap_32(u.val32[0]); 1385 u.val32[1] = bswap_32(u.val32[1]); 1386 } 1387 1388 sample->pid = u.val32[0]; 1389 sample->tid = u.val32[1]; 1390 array--; 1391 } 1392 1393 return 0; 1394} 1395 1396static inline bool overflow(const void *endp, u16 max_size, const void *offset, 1397 u64 size) 1398{ 1399 return size > max_size || offset + size > endp; 1400} 1401 1402#define OVERFLOW_CHECK(offset, size, max_size) \ 1403 do { \ 1404 if (overflow(endp, (max_size), (offset), (size))) \ 1405 return -EFAULT; \ 1406 } while (0) 1407 1408#define OVERFLOW_CHECK_u64(offset) \ 1409 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 1410 1411int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event, 1412 struct perf_sample *data) 1413{ 1414 u64 type = evsel->attr.sample_type; 1415 bool swapped = evsel->needs_swap; 1416 const u64 *array; 1417 u16 max_size = event->header.size; 1418 const void *endp = (void *)event + max_size; 1419 u64 sz; 1420 1421 /* 1422 * used for cross-endian analysis. See git commit 65014ab3 1423 * for why this goofiness is needed. 1424 */ 1425 union u64_swap u; 1426 1427 memset(data, 0, sizeof(*data)); 1428 data->cpu = data->pid = data->tid = -1; 1429 data->stream_id = data->id = data->time = -1ULL; 1430 data->period = evsel->attr.sample_period; 1431 data->weight = 0; 1432 1433 if (event->header.type != PERF_RECORD_SAMPLE) { 1434 if (!evsel->attr.sample_id_all) 1435 return 0; 1436 return perf_evsel__parse_id_sample(evsel, event, data); 1437 } 1438 1439 array = event->sample.array; 1440 1441 /* 1442 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 1443 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 1444 * check the format does not go past the end of the event. 1445 */ 1446 if (evsel->sample_size + sizeof(event->header) > event->header.size) 1447 return -EFAULT; 1448 1449 data->id = -1ULL; 1450 if (type & PERF_SAMPLE_IDENTIFIER) { 1451 data->id = *array; 1452 array++; 1453 } 1454 1455 if (type & PERF_SAMPLE_IP) { 1456 data->ip = *array; 1457 array++; 1458 } 1459 1460 if (type & PERF_SAMPLE_TID) { 1461 u.val64 = *array; 1462 if (swapped) { 1463 /* undo swap of u64, then swap on individual u32s */ 1464 u.val64 = bswap_64(u.val64); 1465 u.val32[0] = bswap_32(u.val32[0]); 1466 u.val32[1] = bswap_32(u.val32[1]); 1467 } 1468 1469 data->pid = u.val32[0]; 1470 data->tid = u.val32[1]; 1471 array++; 1472 } 1473 1474 if (type & PERF_SAMPLE_TIME) { 1475 data->time = *array; 1476 array++; 1477 } 1478 1479 data->addr = 0; 1480 if (type & PERF_SAMPLE_ADDR) { 1481 data->addr = *array; 1482 array++; 1483 } 1484 1485 if (type & PERF_SAMPLE_ID) { 1486 data->id = *array; 1487 array++; 1488 } 1489 1490 if (type & PERF_SAMPLE_STREAM_ID) { 1491 data->stream_id = *array; 1492 array++; 1493 } 1494 1495 if (type & PERF_SAMPLE_CPU) { 1496 1497 u.val64 = *array; 1498 if (swapped) { 1499 /* undo swap of u64, then swap on individual u32s */ 1500 u.val64 = bswap_64(u.val64); 1501 u.val32[0] = bswap_32(u.val32[0]); 1502 } 1503 1504 data->cpu = u.val32[0]; 1505 array++; 1506 } 1507 1508 if (type & PERF_SAMPLE_PERIOD) { 1509 data->period = *array; 1510 array++; 1511 } 1512 1513 if (type & PERF_SAMPLE_READ) { 1514 u64 read_format = evsel->attr.read_format; 1515 1516 OVERFLOW_CHECK_u64(array); 1517 if (read_format & PERF_FORMAT_GROUP) 1518 data->read.group.nr = *array; 1519 else 1520 data->read.one.value = *array; 1521 1522 array++; 1523 1524 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1525 OVERFLOW_CHECK_u64(array); 1526 data->read.time_enabled = *array; 1527 array++; 1528 } 1529 1530 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1531 OVERFLOW_CHECK_u64(array); 1532 data->read.time_running = *array; 1533 array++; 1534 } 1535 1536 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1537 if (read_format & PERF_FORMAT_GROUP) { 1538 const u64 max_group_nr = UINT64_MAX / 1539 sizeof(struct sample_read_value); 1540 1541 if (data->read.group.nr > max_group_nr) 1542 return -EFAULT; 1543 sz = data->read.group.nr * 1544 sizeof(struct sample_read_value); 1545 OVERFLOW_CHECK(array, sz, max_size); 1546 data->read.group.values = 1547 (struct sample_read_value *)array; 1548 array = (void *)array + sz; 1549 } else { 1550 OVERFLOW_CHECK_u64(array); 1551 data->read.one.id = *array; 1552 array++; 1553 } 1554 } 1555 1556 if (type & PERF_SAMPLE_CALLCHAIN) { 1557 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 1558 1559 OVERFLOW_CHECK_u64(array); 1560 data->callchain = (struct ip_callchain *)array++; 1561 if (data->callchain->nr > max_callchain_nr) 1562 return -EFAULT; 1563 sz = data->callchain->nr * sizeof(u64); 1564 OVERFLOW_CHECK(array, sz, max_size); 1565 array = (void *)array + sz; 1566 } 1567 1568 if (type & PERF_SAMPLE_RAW) { 1569 OVERFLOW_CHECK_u64(array); 1570 u.val64 = *array; 1571 if (WARN_ONCE(swapped, 1572 "Endianness of raw data not corrected!\n")) { 1573 /* undo swap of u64, then swap on individual u32s */ 1574 u.val64 = bswap_64(u.val64); 1575 u.val32[0] = bswap_32(u.val32[0]); 1576 u.val32[1] = bswap_32(u.val32[1]); 1577 } 1578 data->raw_size = u.val32[0]; 1579 array = (void *)array + sizeof(u32); 1580 1581 OVERFLOW_CHECK(array, data->raw_size, max_size); 1582 data->raw_data = (void *)array; 1583 array = (void *)array + data->raw_size; 1584 } 1585 1586 if (type & PERF_SAMPLE_BRANCH_STACK) { 1587 const u64 max_branch_nr = UINT64_MAX / 1588 sizeof(struct branch_entry); 1589 1590 OVERFLOW_CHECK_u64(array); 1591 data->branch_stack = (struct branch_stack *)array++; 1592 1593 if (data->branch_stack->nr > max_branch_nr) 1594 return -EFAULT; 1595 sz = data->branch_stack->nr * sizeof(struct branch_entry); 1596 OVERFLOW_CHECK(array, sz, max_size); 1597 array = (void *)array + sz; 1598 } 1599 1600 if (type & PERF_SAMPLE_REGS_USER) { 1601 OVERFLOW_CHECK_u64(array); 1602 data->user_regs.abi = *array; 1603 array++; 1604 1605 if (data->user_regs.abi) { 1606 u64 mask = evsel->attr.sample_regs_user; 1607 1608 sz = hweight_long(mask) * sizeof(u64); 1609 OVERFLOW_CHECK(array, sz, max_size); 1610 data->user_regs.mask = mask; 1611 data->user_regs.regs = (u64 *)array; 1612 array = (void *)array + sz; 1613 } 1614 } 1615 1616 if (type & PERF_SAMPLE_STACK_USER) { 1617 OVERFLOW_CHECK_u64(array); 1618 sz = *array++; 1619 1620 data->user_stack.offset = ((char *)(array - 1) 1621 - (char *) event); 1622 1623 if (!sz) { 1624 data->user_stack.size = 0; 1625 } else { 1626 OVERFLOW_CHECK(array, sz, max_size); 1627 data->user_stack.data = (char *)array; 1628 array = (void *)array + sz; 1629 OVERFLOW_CHECK_u64(array); 1630 data->user_stack.size = *array++; 1631 if (WARN_ONCE(data->user_stack.size > sz, 1632 "user stack dump failure\n")) 1633 return -EFAULT; 1634 } 1635 } 1636 1637 data->weight = 0; 1638 if (type & PERF_SAMPLE_WEIGHT) { 1639 OVERFLOW_CHECK_u64(array); 1640 data->weight = *array; 1641 array++; 1642 } 1643 1644 data->data_src = PERF_MEM_DATA_SRC_NONE; 1645 if (type & PERF_SAMPLE_DATA_SRC) { 1646 OVERFLOW_CHECK_u64(array); 1647 data->data_src = *array; 1648 array++; 1649 } 1650 1651 data->transaction = 0; 1652 if (type & PERF_SAMPLE_TRANSACTION) { 1653 OVERFLOW_CHECK_u64(array); 1654 data->transaction = *array; 1655 array++; 1656 } 1657 1658 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 1659 if (type & PERF_SAMPLE_REGS_INTR) { 1660 OVERFLOW_CHECK_u64(array); 1661 data->intr_regs.abi = *array; 1662 array++; 1663 1664 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 1665 u64 mask = evsel->attr.sample_regs_intr; 1666 1667 sz = hweight_long(mask) * sizeof(u64); 1668 OVERFLOW_CHECK(array, sz, max_size); 1669 data->intr_regs.mask = mask; 1670 data->intr_regs.regs = (u64 *)array; 1671 array = (void *)array + sz; 1672 } 1673 } 1674 1675 return 0; 1676} 1677 1678size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, 1679 u64 read_format) 1680{ 1681 size_t sz, result = sizeof(struct sample_event); 1682 1683 if (type & PERF_SAMPLE_IDENTIFIER) 1684 result += sizeof(u64); 1685 1686 if (type & PERF_SAMPLE_IP) 1687 result += sizeof(u64); 1688 1689 if (type & PERF_SAMPLE_TID) 1690 result += sizeof(u64); 1691 1692 if (type & PERF_SAMPLE_TIME) 1693 result += sizeof(u64); 1694 1695 if (type & PERF_SAMPLE_ADDR) 1696 result += sizeof(u64); 1697 1698 if (type & PERF_SAMPLE_ID) 1699 result += sizeof(u64); 1700 1701 if (type & PERF_SAMPLE_STREAM_ID) 1702 result += sizeof(u64); 1703 1704 if (type & PERF_SAMPLE_CPU) 1705 result += sizeof(u64); 1706 1707 if (type & PERF_SAMPLE_PERIOD) 1708 result += sizeof(u64); 1709 1710 if (type & PERF_SAMPLE_READ) { 1711 result += sizeof(u64); 1712 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1713 result += sizeof(u64); 1714 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1715 result += sizeof(u64); 1716 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1717 if (read_format & PERF_FORMAT_GROUP) { 1718 sz = sample->read.group.nr * 1719 sizeof(struct sample_read_value); 1720 result += sz; 1721 } else { 1722 result += sizeof(u64); 1723 } 1724 } 1725 1726 if (type & PERF_SAMPLE_CALLCHAIN) { 1727 sz = (sample->callchain->nr + 1) * sizeof(u64); 1728 result += sz; 1729 } 1730 1731 if (type & PERF_SAMPLE_RAW) { 1732 result += sizeof(u32); 1733 result += sample->raw_size; 1734 } 1735 1736 if (type & PERF_SAMPLE_BRANCH_STACK) { 1737 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1738 sz += sizeof(u64); 1739 result += sz; 1740 } 1741 1742 if (type & PERF_SAMPLE_REGS_USER) { 1743 if (sample->user_regs.abi) { 1744 result += sizeof(u64); 1745 sz = hweight_long(sample->user_regs.mask) * sizeof(u64); 1746 result += sz; 1747 } else { 1748 result += sizeof(u64); 1749 } 1750 } 1751 1752 if (type & PERF_SAMPLE_STACK_USER) { 1753 sz = sample->user_stack.size; 1754 result += sizeof(u64); 1755 if (sz) { 1756 result += sz; 1757 result += sizeof(u64); 1758 } 1759 } 1760 1761 if (type & PERF_SAMPLE_WEIGHT) 1762 result += sizeof(u64); 1763 1764 if (type & PERF_SAMPLE_DATA_SRC) 1765 result += sizeof(u64); 1766 1767 if (type & PERF_SAMPLE_TRANSACTION) 1768 result += sizeof(u64); 1769 1770 if (type & PERF_SAMPLE_REGS_INTR) { 1771 if (sample->intr_regs.abi) { 1772 result += sizeof(u64); 1773 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64); 1774 result += sz; 1775 } else { 1776 result += sizeof(u64); 1777 } 1778 } 1779 1780 return result; 1781} 1782 1783int perf_event__synthesize_sample(union perf_event *event, u64 type, 1784 u64 read_format, 1785 const struct perf_sample *sample, 1786 bool swapped) 1787{ 1788 u64 *array; 1789 size_t sz; 1790 /* 1791 * used for cross-endian analysis. See git commit 65014ab3 1792 * for why this goofiness is needed. 1793 */ 1794 union u64_swap u; 1795 1796 array = event->sample.array; 1797 1798 if (type & PERF_SAMPLE_IDENTIFIER) { 1799 *array = sample->id; 1800 array++; 1801 } 1802 1803 if (type & PERF_SAMPLE_IP) { 1804 *array = sample->ip; 1805 array++; 1806 } 1807 1808 if (type & PERF_SAMPLE_TID) { 1809 u.val32[0] = sample->pid; 1810 u.val32[1] = sample->tid; 1811 if (swapped) { 1812 /* 1813 * Inverse of what is done in perf_evsel__parse_sample 1814 */ 1815 u.val32[0] = bswap_32(u.val32[0]); 1816 u.val32[1] = bswap_32(u.val32[1]); 1817 u.val64 = bswap_64(u.val64); 1818 } 1819 1820 *array = u.val64; 1821 array++; 1822 } 1823 1824 if (type & PERF_SAMPLE_TIME) { 1825 *array = sample->time; 1826 array++; 1827 } 1828 1829 if (type & PERF_SAMPLE_ADDR) { 1830 *array = sample->addr; 1831 array++; 1832 } 1833 1834 if (type & PERF_SAMPLE_ID) { 1835 *array = sample->id; 1836 array++; 1837 } 1838 1839 if (type & PERF_SAMPLE_STREAM_ID) { 1840 *array = sample->stream_id; 1841 array++; 1842 } 1843 1844 if (type & PERF_SAMPLE_CPU) { 1845 u.val32[0] = sample->cpu; 1846 if (swapped) { 1847 /* 1848 * Inverse of what is done in perf_evsel__parse_sample 1849 */ 1850 u.val32[0] = bswap_32(u.val32[0]); 1851 u.val64 = bswap_64(u.val64); 1852 } 1853 *array = u.val64; 1854 array++; 1855 } 1856 1857 if (type & PERF_SAMPLE_PERIOD) { 1858 *array = sample->period; 1859 array++; 1860 } 1861 1862 if (type & PERF_SAMPLE_READ) { 1863 if (read_format & PERF_FORMAT_GROUP) 1864 *array = sample->read.group.nr; 1865 else 1866 *array = sample->read.one.value; 1867 array++; 1868 1869 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1870 *array = sample->read.time_enabled; 1871 array++; 1872 } 1873 1874 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1875 *array = sample->read.time_running; 1876 array++; 1877 } 1878 1879 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1880 if (read_format & PERF_FORMAT_GROUP) { 1881 sz = sample->read.group.nr * 1882 sizeof(struct sample_read_value); 1883 memcpy(array, sample->read.group.values, sz); 1884 array = (void *)array + sz; 1885 } else { 1886 *array = sample->read.one.id; 1887 array++; 1888 } 1889 } 1890 1891 if (type & PERF_SAMPLE_CALLCHAIN) { 1892 sz = (sample->callchain->nr + 1) * sizeof(u64); 1893 memcpy(array, sample->callchain, sz); 1894 array = (void *)array + sz; 1895 } 1896 1897 if (type & PERF_SAMPLE_RAW) { 1898 u.val32[0] = sample->raw_size; 1899 if (WARN_ONCE(swapped, 1900 "Endianness of raw data not corrected!\n")) { 1901 /* 1902 * Inverse of what is done in perf_evsel__parse_sample 1903 */ 1904 u.val32[0] = bswap_32(u.val32[0]); 1905 u.val32[1] = bswap_32(u.val32[1]); 1906 u.val64 = bswap_64(u.val64); 1907 } 1908 *array = u.val64; 1909 array = (void *)array + sizeof(u32); 1910 1911 memcpy(array, sample->raw_data, sample->raw_size); 1912 array = (void *)array + sample->raw_size; 1913 } 1914 1915 if (type & PERF_SAMPLE_BRANCH_STACK) { 1916 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1917 sz += sizeof(u64); 1918 memcpy(array, sample->branch_stack, sz); 1919 array = (void *)array + sz; 1920 } 1921 1922 if (type & PERF_SAMPLE_REGS_USER) { 1923 if (sample->user_regs.abi) { 1924 *array++ = sample->user_regs.abi; 1925 sz = hweight_long(sample->user_regs.mask) * sizeof(u64); 1926 memcpy(array, sample->user_regs.regs, sz); 1927 array = (void *)array + sz; 1928 } else { 1929 *array++ = 0; 1930 } 1931 } 1932 1933 if (type & PERF_SAMPLE_STACK_USER) { 1934 sz = sample->user_stack.size; 1935 *array++ = sz; 1936 if (sz) { 1937 memcpy(array, sample->user_stack.data, sz); 1938 array = (void *)array + sz; 1939 *array++ = sz; 1940 } 1941 } 1942 1943 if (type & PERF_SAMPLE_WEIGHT) { 1944 *array = sample->weight; 1945 array++; 1946 } 1947 1948 if (type & PERF_SAMPLE_DATA_SRC) { 1949 *array = sample->data_src; 1950 array++; 1951 } 1952 1953 if (type & PERF_SAMPLE_TRANSACTION) { 1954 *array = sample->transaction; 1955 array++; 1956 } 1957 1958 if (type & PERF_SAMPLE_REGS_INTR) { 1959 if (sample->intr_regs.abi) { 1960 *array++ = sample->intr_regs.abi; 1961 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64); 1962 memcpy(array, sample->intr_regs.regs, sz); 1963 array = (void *)array + sz; 1964 } else { 1965 *array++ = 0; 1966 } 1967 } 1968 1969 return 0; 1970} 1971 1972struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name) 1973{ 1974 return pevent_find_field(evsel->tp_format, name); 1975} 1976 1977void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample, 1978 const char *name) 1979{ 1980 struct format_field *field = perf_evsel__field(evsel, name); 1981 int offset; 1982 1983 if (!field) 1984 return NULL; 1985 1986 offset = field->offset; 1987 1988 if (field->flags & FIELD_IS_DYNAMIC) { 1989 offset = *(int *)(sample->raw_data + field->offset); 1990 offset &= 0xffff; 1991 } 1992 1993 return sample->raw_data + offset; 1994} 1995 1996u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample, 1997 const char *name) 1998{ 1999 struct format_field *field = perf_evsel__field(evsel, name); 2000 void *ptr; 2001 u64 value; 2002 2003 if (!field) 2004 return 0; 2005 2006 ptr = sample->raw_data + field->offset; 2007 2008 switch (field->size) { 2009 case 1: 2010 return *(u8 *)ptr; 2011 case 2: 2012 value = *(u16 *)ptr; 2013 break; 2014 case 4: 2015 value = *(u32 *)ptr; 2016 break; 2017 case 8: 2018 memcpy(&value, ptr, sizeof(u64)); 2019 break; 2020 default: 2021 return 0; 2022 } 2023 2024 if (!evsel->needs_swap) 2025 return value; 2026 2027 switch (field->size) { 2028 case 2: 2029 return bswap_16(value); 2030 case 4: 2031 return bswap_32(value); 2032 case 8: 2033 return bswap_64(value); 2034 default: 2035 return 0; 2036 } 2037 2038 return 0; 2039} 2040 2041static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...) 2042{ 2043 va_list args; 2044 int ret = 0; 2045 2046 if (!*first) { 2047 ret += fprintf(fp, ","); 2048 } else { 2049 ret += fprintf(fp, ":"); 2050 *first = false; 2051 } 2052 2053 va_start(args, fmt); 2054 ret += vfprintf(fp, fmt, args); 2055 va_end(args); 2056 return ret; 2057} 2058 2059static int __print_attr__fprintf(FILE *fp, const char *name, const char *val, void *priv) 2060{ 2061 return comma_fprintf(fp, (bool *)priv, " %s: %s", name, val); 2062} 2063 2064int perf_evsel__fprintf(struct perf_evsel *evsel, 2065 struct perf_attr_details *details, FILE *fp) 2066{ 2067 bool first = true; 2068 int printed = 0; 2069 2070 if (details->event_group) { 2071 struct perf_evsel *pos; 2072 2073 if (!perf_evsel__is_group_leader(evsel)) 2074 return 0; 2075 2076 if (evsel->nr_members > 1) 2077 printed += fprintf(fp, "%s{", evsel->group_name ?: ""); 2078 2079 printed += fprintf(fp, "%s", perf_evsel__name(evsel)); 2080 for_each_group_member(pos, evsel) 2081 printed += fprintf(fp, ",%s", perf_evsel__name(pos)); 2082 2083 if (evsel->nr_members > 1) 2084 printed += fprintf(fp, "}"); 2085 goto out; 2086 } 2087 2088 printed += fprintf(fp, "%s", perf_evsel__name(evsel)); 2089 2090 if (details->verbose) { 2091 printed += perf_event_attr__fprintf(fp, &evsel->attr, 2092 __print_attr__fprintf, &first); 2093 } else if (details->freq) { 2094 printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64, 2095 (u64)evsel->attr.sample_freq); 2096 } 2097out: 2098 fputc('\n', fp); 2099 return ++printed; 2100} 2101 2102bool perf_evsel__fallback(struct perf_evsel *evsel, int err, 2103 char *msg, size_t msgsize) 2104{ 2105 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2106 evsel->attr.type == PERF_TYPE_HARDWARE && 2107 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2108 /* 2109 * If it's cycles then fall back to hrtimer based 2110 * cpu-clock-tick sw counter, which is always available even if 2111 * no PMU support. 2112 * 2113 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2114 * b0a873e). 2115 */ 2116 scnprintf(msg, msgsize, "%s", 2117"The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2118 2119 evsel->attr.type = PERF_TYPE_SOFTWARE; 2120 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK; 2121 2122 zfree(&evsel->name); 2123 return true; 2124 } 2125 2126 return false; 2127} 2128 2129int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target, 2130 int err, char *msg, size_t size) 2131{ 2132 char sbuf[STRERR_BUFSIZE]; 2133 2134 switch (err) { 2135 case EPERM: 2136 case EACCES: 2137 return scnprintf(msg, size, 2138 "You may not have permission to collect %sstats.\n" 2139 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n" 2140 " -1 - Not paranoid at all\n" 2141 " 0 - Disallow raw tracepoint access for unpriv\n" 2142 " 1 - Disallow cpu events for unpriv\n" 2143 " 2 - Disallow kernel profiling for unpriv", 2144 target->system_wide ? "system-wide " : ""); 2145 case ENOENT: 2146 return scnprintf(msg, size, "The %s event is not supported.", 2147 perf_evsel__name(evsel)); 2148 case EMFILE: 2149 return scnprintf(msg, size, "%s", 2150 "Too many events are opened.\n" 2151 "Try again after reducing the number of events."); 2152 case ENODEV: 2153 if (target->cpu_list) 2154 return scnprintf(msg, size, "%s", 2155 "No such device - did you specify an out-of-range profile CPU?\n"); 2156 break; 2157 case EOPNOTSUPP: 2158 if (evsel->attr.precise_ip) 2159 return scnprintf(msg, size, "%s", 2160 "\'precise\' request may not be supported. Try removing 'p' modifier."); 2161#if defined(__i386__) || defined(__x86_64__) 2162 if (evsel->attr.type == PERF_TYPE_HARDWARE) 2163 return scnprintf(msg, size, "%s", 2164 "No hardware sampling interrupt available.\n" 2165 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it."); 2166#endif 2167 break; 2168 case EBUSY: 2169 if (find_process("oprofiled")) 2170 return scnprintf(msg, size, 2171 "The PMU counters are busy/taken by another profiler.\n" 2172 "We found oprofile daemon running, please stop it and try again."); 2173 break; 2174 case EINVAL: 2175 if (perf_missing_features.clockid) 2176 return scnprintf(msg, size, "clockid feature not supported."); 2177 if (perf_missing_features.clockid_wrong) 2178 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 2179 break; 2180 default: 2181 break; 2182 } 2183 2184 return scnprintf(msg, size, 2185 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 2186 "/bin/dmesg may provide additional information.\n" 2187 "No CONFIG_PERF_EVENTS=y kernel support configured?\n", 2188 err, strerror_r(err, sbuf, sizeof(sbuf)), 2189 perf_evsel__name(evsel)); 2190} 2191