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 __perf_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 perf_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 __perf_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 perf_evsel__calc_id_pos(evsel); 194 } 195 } 196 197 void __perf_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 perf_evsel__calc_id_pos(evsel); 204 } 205 } 206 207 void perf_evsel__set_sample_id(struct evsel *evsel, 208 bool can_sample_identifier) 209 { 210 if (can_sample_identifier) { 211 perf_evsel__reset_sample_bit(evsel, ID); 212 perf_evsel__set_sample_bit(evsel, IDENTIFIER); 213 } else { 214 perf_evsel__set_sample_bit(evsel, ID); 215 } 216 evsel->core.attr.read_format |= PERF_FORMAT_ID; 217 } 218 219 /** 220 * perf_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 perf_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 = __perf_evsel__sample_size(attr->sample_type); 253 perf_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 (perf_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 (perf_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 *__perf_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 perf_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 433 { 434 int r = scnprintf(bf, size, "%s", __perf_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 *__perf_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 perf_evsel__sw_name(struct evsel *evsel, char *bf, size_t size) 459 { 460 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->core.attr.config)); 461 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 462 } 463 464 static int __perf_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 perf_evsel__bp_name(struct evsel *evsel, char *bf, size_t size) 483 { 484 struct perf_event_attr *attr = &evsel->core.attr; 485 int r = __perf_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 perf_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 __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, 543 char *bf, size_t size) 544 { 545 if (result) { 546 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0], 547 perf_evsel__hw_cache_op[op][0], 548 perf_evsel__hw_cache_result[result][0]); 549 } 550 551 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0], 552 perf_evsel__hw_cache_op[op][1]); 553 } 554 555 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size) 556 { 557 u8 op, result, type = (config >> 0) & 0xff; 558 const char *err = "unknown-ext-hardware-cache-type"; 559 560 if (type >= PERF_COUNT_HW_CACHE_MAX) 561 goto out_err; 562 563 op = (config >> 8) & 0xff; 564 err = "unknown-ext-hardware-cache-op"; 565 if (op >= PERF_COUNT_HW_CACHE_OP_MAX) 566 goto out_err; 567 568 result = (config >> 16) & 0xff; 569 err = "unknown-ext-hardware-cache-result"; 570 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX) 571 goto out_err; 572 573 err = "invalid-cache"; 574 if (!perf_evsel__is_cache_op_valid(type, op)) 575 goto out_err; 576 577 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 578 out_err: 579 return scnprintf(bf, size, "%s", err); 580 } 581 582 static int perf_evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size) 583 { 584 int ret = __perf_evsel__hw_cache_name(evsel->core.attr.config, bf, size); 585 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 586 } 587 588 static int perf_evsel__raw_name(struct evsel *evsel, char *bf, size_t size) 589 { 590 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config); 591 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 592 } 593 594 static int perf_evsel__tool_name(char *bf, size_t size) 595 { 596 int ret = scnprintf(bf, size, "duration_time"); 597 return ret; 598 } 599 600 const char *perf_evsel__name(struct evsel *evsel) 601 { 602 char bf[128]; 603 604 if (!evsel) 605 goto out_unknown; 606 607 if (evsel->name) 608 return evsel->name; 609 610 switch (evsel->core.attr.type) { 611 case PERF_TYPE_RAW: 612 perf_evsel__raw_name(evsel, bf, sizeof(bf)); 613 break; 614 615 case PERF_TYPE_HARDWARE: 616 perf_evsel__hw_name(evsel, bf, sizeof(bf)); 617 break; 618 619 case PERF_TYPE_HW_CACHE: 620 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf)); 621 break; 622 623 case PERF_TYPE_SOFTWARE: 624 if (evsel->tool_event) 625 perf_evsel__tool_name(bf, sizeof(bf)); 626 else 627 perf_evsel__sw_name(evsel, bf, sizeof(bf)); 628 break; 629 630 case PERF_TYPE_TRACEPOINT: 631 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 632 break; 633 634 case PERF_TYPE_BREAKPOINT: 635 perf_evsel__bp_name(evsel, bf, sizeof(bf)); 636 break; 637 638 default: 639 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 640 evsel->core.attr.type); 641 break; 642 } 643 644 evsel->name = strdup(bf); 645 646 if (evsel->name) 647 return evsel->name; 648 out_unknown: 649 return "unknown"; 650 } 651 652 const char *perf_evsel__group_name(struct evsel *evsel) 653 { 654 return evsel->group_name ?: "anon group"; 655 } 656 657 /* 658 * Returns the group details for the specified leader, 659 * with following rules. 660 * 661 * For record -e '{cycles,instructions}' 662 * 'anon group { cycles:u, instructions:u }' 663 * 664 * For record -e 'cycles,instructions' and report --group 665 * 'cycles:u, instructions:u' 666 */ 667 int perf_evsel__group_desc(struct evsel *evsel, char *buf, size_t size) 668 { 669 int ret = 0; 670 struct evsel *pos; 671 const char *group_name = perf_evsel__group_name(evsel); 672 673 if (!evsel->forced_leader) 674 ret = scnprintf(buf, size, "%s { ", group_name); 675 676 ret += scnprintf(buf + ret, size - ret, "%s", 677 perf_evsel__name(evsel)); 678 679 for_each_group_member(pos, evsel) 680 ret += scnprintf(buf + ret, size - ret, ", %s", 681 perf_evsel__name(pos)); 682 683 if (!evsel->forced_leader) 684 ret += scnprintf(buf + ret, size - ret, " }"); 685 686 return ret; 687 } 688 689 static void __perf_evsel__config_callchain(struct evsel *evsel, 690 struct record_opts *opts, 691 struct callchain_param *param) 692 { 693 bool function = perf_evsel__is_function_event(evsel); 694 struct perf_event_attr *attr = &evsel->core.attr; 695 696 perf_evsel__set_sample_bit(evsel, CALLCHAIN); 697 698 attr->sample_max_stack = param->max_stack; 699 700 if (opts->kernel_callchains) 701 attr->exclude_callchain_user = 1; 702 if (opts->user_callchains) 703 attr->exclude_callchain_kernel = 1; 704 if (param->record_mode == CALLCHAIN_LBR) { 705 if (!opts->branch_stack) { 706 if (attr->exclude_user) { 707 pr_warning("LBR callstack option is only available " 708 "to get user callchain information. " 709 "Falling back to framepointers.\n"); 710 } else { 711 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 712 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 713 PERF_SAMPLE_BRANCH_CALL_STACK | 714 PERF_SAMPLE_BRANCH_NO_CYCLES | 715 PERF_SAMPLE_BRANCH_NO_FLAGS; 716 } 717 } else 718 pr_warning("Cannot use LBR callstack with branch stack. " 719 "Falling back to framepointers.\n"); 720 } 721 722 if (param->record_mode == CALLCHAIN_DWARF) { 723 if (!function) { 724 perf_evsel__set_sample_bit(evsel, REGS_USER); 725 perf_evsel__set_sample_bit(evsel, STACK_USER); 726 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) { 727 attr->sample_regs_user |= DWARF_MINIMAL_REGS; 728 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " 729 "specifying a subset with --user-regs may render DWARF unwinding unreliable, " 730 "so the minimal registers set (IP, SP) is explicitly forced.\n"); 731 } else { 732 attr->sample_regs_user |= PERF_REGS_MASK; 733 } 734 attr->sample_stack_user = param->dump_size; 735 attr->exclude_callchain_user = 1; 736 } else { 737 pr_info("Cannot use DWARF unwind for function trace event," 738 " falling back to framepointers.\n"); 739 } 740 } 741 742 if (function) { 743 pr_info("Disabling user space callchains for function trace event.\n"); 744 attr->exclude_callchain_user = 1; 745 } 746 } 747 748 void perf_evsel__config_callchain(struct evsel *evsel, 749 struct record_opts *opts, 750 struct callchain_param *param) 751 { 752 if (param->enabled) 753 return __perf_evsel__config_callchain(evsel, opts, param); 754 } 755 756 static void 757 perf_evsel__reset_callgraph(struct evsel *evsel, 758 struct callchain_param *param) 759 { 760 struct perf_event_attr *attr = &evsel->core.attr; 761 762 perf_evsel__reset_sample_bit(evsel, CALLCHAIN); 763 if (param->record_mode == CALLCHAIN_LBR) { 764 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK); 765 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER | 766 PERF_SAMPLE_BRANCH_CALL_STACK); 767 } 768 if (param->record_mode == CALLCHAIN_DWARF) { 769 perf_evsel__reset_sample_bit(evsel, REGS_USER); 770 perf_evsel__reset_sample_bit(evsel, STACK_USER); 771 } 772 } 773 774 static void apply_config_terms(struct evsel *evsel, 775 struct record_opts *opts, bool track) 776 { 777 struct perf_evsel_config_term *term; 778 struct list_head *config_terms = &evsel->config_terms; 779 struct perf_event_attr *attr = &evsel->core.attr; 780 /* callgraph default */ 781 struct callchain_param param = { 782 .record_mode = callchain_param.record_mode, 783 }; 784 u32 dump_size = 0; 785 int max_stack = 0; 786 const char *callgraph_buf = NULL; 787 788 list_for_each_entry(term, config_terms, list) { 789 switch (term->type) { 790 case PERF_EVSEL__CONFIG_TERM_PERIOD: 791 if (!(term->weak && opts->user_interval != ULLONG_MAX)) { 792 attr->sample_period = term->val.period; 793 attr->freq = 0; 794 perf_evsel__reset_sample_bit(evsel, PERIOD); 795 } 796 break; 797 case PERF_EVSEL__CONFIG_TERM_FREQ: 798 if (!(term->weak && opts->user_freq != UINT_MAX)) { 799 attr->sample_freq = term->val.freq; 800 attr->freq = 1; 801 perf_evsel__set_sample_bit(evsel, PERIOD); 802 } 803 break; 804 case PERF_EVSEL__CONFIG_TERM_TIME: 805 if (term->val.time) 806 perf_evsel__set_sample_bit(evsel, TIME); 807 else 808 perf_evsel__reset_sample_bit(evsel, TIME); 809 break; 810 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH: 811 callgraph_buf = term->val.callgraph; 812 break; 813 case PERF_EVSEL__CONFIG_TERM_BRANCH: 814 if (term->val.branch && strcmp(term->val.branch, "no")) { 815 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 816 parse_branch_str(term->val.branch, 817 &attr->branch_sample_type); 818 } else 819 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK); 820 break; 821 case PERF_EVSEL__CONFIG_TERM_STACK_USER: 822 dump_size = term->val.stack_user; 823 break; 824 case PERF_EVSEL__CONFIG_TERM_MAX_STACK: 825 max_stack = term->val.max_stack; 826 break; 827 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS: 828 evsel->max_events = term->val.max_events; 829 break; 830 case PERF_EVSEL__CONFIG_TERM_INHERIT: 831 /* 832 * attr->inherit should has already been set by 833 * perf_evsel__config. If user explicitly set 834 * inherit using config terms, override global 835 * opt->no_inherit setting. 836 */ 837 attr->inherit = term->val.inherit ? 1 : 0; 838 break; 839 case PERF_EVSEL__CONFIG_TERM_OVERWRITE: 840 attr->write_backward = term->val.overwrite ? 1 : 0; 841 break; 842 case PERF_EVSEL__CONFIG_TERM_DRV_CFG: 843 break; 844 case PERF_EVSEL__CONFIG_TERM_PERCORE: 845 break; 846 case PERF_EVSEL__CONFIG_TERM_AUX_OUTPUT: 847 attr->aux_output = term->val.aux_output ? 1 : 0; 848 break; 849 default: 850 break; 851 } 852 } 853 854 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 855 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 856 bool sample_address = false; 857 858 if (max_stack) { 859 param.max_stack = max_stack; 860 if (callgraph_buf == NULL) 861 callgraph_buf = "fp"; 862 } 863 864 /* parse callgraph parameters */ 865 if (callgraph_buf != NULL) { 866 if (!strcmp(callgraph_buf, "no")) { 867 param.enabled = false; 868 param.record_mode = CALLCHAIN_NONE; 869 } else { 870 param.enabled = true; 871 if (parse_callchain_record(callgraph_buf, ¶m)) { 872 pr_err("per-event callgraph setting for %s failed. " 873 "Apply callgraph global setting for it\n", 874 evsel->name); 875 return; 876 } 877 if (param.record_mode == CALLCHAIN_DWARF) 878 sample_address = true; 879 } 880 } 881 if (dump_size > 0) { 882 dump_size = round_up(dump_size, sizeof(u64)); 883 param.dump_size = dump_size; 884 } 885 886 /* If global callgraph set, clear it */ 887 if (callchain_param.enabled) 888 perf_evsel__reset_callgraph(evsel, &callchain_param); 889 890 /* set perf-event callgraph */ 891 if (param.enabled) { 892 if (sample_address) { 893 perf_evsel__set_sample_bit(evsel, ADDR); 894 perf_evsel__set_sample_bit(evsel, DATA_SRC); 895 evsel->core.attr.mmap_data = track; 896 } 897 perf_evsel__config_callchain(evsel, opts, ¶m); 898 } 899 } 900 } 901 902 static bool is_dummy_event(struct evsel *evsel) 903 { 904 return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) && 905 (evsel->core.attr.config == PERF_COUNT_SW_DUMMY); 906 } 907 908 /* 909 * The enable_on_exec/disabled value strategy: 910 * 911 * 1) For any type of traced program: 912 * - all independent events and group leaders are disabled 913 * - all group members are enabled 914 * 915 * Group members are ruled by group leaders. They need to 916 * be enabled, because the group scheduling relies on that. 917 * 918 * 2) For traced programs executed by perf: 919 * - all independent events and group leaders have 920 * enable_on_exec set 921 * - we don't specifically enable or disable any event during 922 * the record command 923 * 924 * Independent events and group leaders are initially disabled 925 * and get enabled by exec. Group members are ruled by group 926 * leaders as stated in 1). 927 * 928 * 3) For traced programs attached by perf (pid/tid): 929 * - we specifically enable or disable all events during 930 * the record command 931 * 932 * When attaching events to already running traced we 933 * enable/disable events specifically, as there's no 934 * initial traced exec call. 935 */ 936 void perf_evsel__config(struct evsel *evsel, struct record_opts *opts, 937 struct callchain_param *callchain) 938 { 939 struct evsel *leader = evsel->leader; 940 struct perf_event_attr *attr = &evsel->core.attr; 941 int track = evsel->tracking; 942 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 943 944 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 945 attr->inherit = !opts->no_inherit; 946 attr->write_backward = opts->overwrite ? 1 : 0; 947 948 perf_evsel__set_sample_bit(evsel, IP); 949 perf_evsel__set_sample_bit(evsel, TID); 950 951 if (evsel->sample_read) { 952 perf_evsel__set_sample_bit(evsel, READ); 953 954 /* 955 * We need ID even in case of single event, because 956 * PERF_SAMPLE_READ process ID specific data. 957 */ 958 perf_evsel__set_sample_id(evsel, false); 959 960 /* 961 * Apply group format only if we belong to group 962 * with more than one members. 963 */ 964 if (leader->core.nr_members > 1) { 965 attr->read_format |= PERF_FORMAT_GROUP; 966 attr->inherit = 0; 967 } 968 } 969 970 /* 971 * We default some events to have a default interval. But keep 972 * it a weak assumption overridable by the user. 973 */ 974 if (!attr->sample_period || (opts->user_freq != UINT_MAX || 975 opts->user_interval != ULLONG_MAX)) { 976 if (opts->freq) { 977 perf_evsel__set_sample_bit(evsel, PERIOD); 978 attr->freq = 1; 979 attr->sample_freq = opts->freq; 980 } else { 981 attr->sample_period = opts->default_interval; 982 } 983 } 984 985 /* 986 * Disable sampling for all group members other 987 * than leader in case leader 'leads' the sampling. 988 */ 989 if ((leader != evsel) && leader->sample_read) { 990 attr->freq = 0; 991 attr->sample_freq = 0; 992 attr->sample_period = 0; 993 attr->write_backward = 0; 994 995 /* 996 * We don't get sample for slave events, we make them 997 * when delivering group leader sample. Set the slave 998 * event to follow the master sample_type to ease up 999 * report. 1000 */ 1001 attr->sample_type = leader->core.attr.sample_type; 1002 } 1003 1004 if (opts->no_samples) 1005 attr->sample_freq = 0; 1006 1007 if (opts->inherit_stat) { 1008 evsel->core.attr.read_format |= 1009 PERF_FORMAT_TOTAL_TIME_ENABLED | 1010 PERF_FORMAT_TOTAL_TIME_RUNNING | 1011 PERF_FORMAT_ID; 1012 attr->inherit_stat = 1; 1013 } 1014 1015 if (opts->sample_address) { 1016 perf_evsel__set_sample_bit(evsel, ADDR); 1017 attr->mmap_data = track; 1018 } 1019 1020 /* 1021 * We don't allow user space callchains for function trace 1022 * event, due to issues with page faults while tracing page 1023 * fault handler and its overall trickiness nature. 1024 */ 1025 if (perf_evsel__is_function_event(evsel)) 1026 evsel->core.attr.exclude_callchain_user = 1; 1027 1028 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1029 perf_evsel__config_callchain(evsel, opts, callchain); 1030 1031 if (opts->sample_intr_regs) { 1032 attr->sample_regs_intr = opts->sample_intr_regs; 1033 perf_evsel__set_sample_bit(evsel, REGS_INTR); 1034 } 1035 1036 if (opts->sample_user_regs) { 1037 attr->sample_regs_user |= opts->sample_user_regs; 1038 perf_evsel__set_sample_bit(evsel, REGS_USER); 1039 } 1040 1041 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1042 perf_evsel__set_sample_bit(evsel, CPU); 1043 1044 /* 1045 * When the user explicitly disabled time don't force it here. 1046 */ 1047 if (opts->sample_time && 1048 (!perf_missing_features.sample_id_all && 1049 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1050 opts->sample_time_set))) 1051 perf_evsel__set_sample_bit(evsel, TIME); 1052 1053 if (opts->raw_samples && !evsel->no_aux_samples) { 1054 perf_evsel__set_sample_bit(evsel, TIME); 1055 perf_evsel__set_sample_bit(evsel, RAW); 1056 perf_evsel__set_sample_bit(evsel, CPU); 1057 } 1058 1059 if (opts->sample_address) 1060 perf_evsel__set_sample_bit(evsel, DATA_SRC); 1061 1062 if (opts->sample_phys_addr) 1063 perf_evsel__set_sample_bit(evsel, PHYS_ADDR); 1064 1065 if (opts->no_buffering) { 1066 attr->watermark = 0; 1067 attr->wakeup_events = 1; 1068 } 1069 if (opts->branch_stack && !evsel->no_aux_samples) { 1070 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 1071 attr->branch_sample_type = opts->branch_stack; 1072 } 1073 1074 if (opts->sample_weight) 1075 perf_evsel__set_sample_bit(evsel, WEIGHT); 1076 1077 attr->task = track; 1078 attr->mmap = track; 1079 attr->mmap2 = track && !perf_missing_features.mmap2; 1080 attr->comm = track; 1081 attr->ksymbol = track && !perf_missing_features.ksymbol; 1082 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1083 1084 if (opts->record_namespaces) 1085 attr->namespaces = track; 1086 1087 if (opts->record_switch_events) 1088 attr->context_switch = track; 1089 1090 if (opts->sample_transaction) 1091 perf_evsel__set_sample_bit(evsel, TRANSACTION); 1092 1093 if (opts->running_time) { 1094 evsel->core.attr.read_format |= 1095 PERF_FORMAT_TOTAL_TIME_ENABLED | 1096 PERF_FORMAT_TOTAL_TIME_RUNNING; 1097 } 1098 1099 /* 1100 * XXX see the function comment above 1101 * 1102 * Disabling only independent events or group leaders, 1103 * keeping group members enabled. 1104 */ 1105 if (perf_evsel__is_group_leader(evsel)) 1106 attr->disabled = 1; 1107 1108 /* 1109 * Setting enable_on_exec for independent events and 1110 * group leaders for traced executed by perf. 1111 */ 1112 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) && 1113 !opts->initial_delay) 1114 attr->enable_on_exec = 1; 1115 1116 if (evsel->immediate) { 1117 attr->disabled = 0; 1118 attr->enable_on_exec = 0; 1119 } 1120 1121 clockid = opts->clockid; 1122 if (opts->use_clockid) { 1123 attr->use_clockid = 1; 1124 attr->clockid = opts->clockid; 1125 } 1126 1127 if (evsel->precise_max) 1128 attr->precise_ip = 3; 1129 1130 if (opts->all_user) { 1131 attr->exclude_kernel = 1; 1132 attr->exclude_user = 0; 1133 } 1134 1135 if (opts->all_kernel) { 1136 attr->exclude_kernel = 0; 1137 attr->exclude_user = 1; 1138 } 1139 1140 if (evsel->core.own_cpus || evsel->unit) 1141 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1142 1143 /* 1144 * Apply event specific term settings, 1145 * it overloads any global configuration. 1146 */ 1147 apply_config_terms(evsel, opts, track); 1148 1149 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1150 1151 /* The --period option takes the precedence. */ 1152 if (opts->period_set) { 1153 if (opts->period) 1154 perf_evsel__set_sample_bit(evsel, PERIOD); 1155 else 1156 perf_evsel__reset_sample_bit(evsel, PERIOD); 1157 } 1158 1159 /* 1160 * For initial_delay, a dummy event is added implicitly. 1161 * The software event will trigger -EOPNOTSUPP error out, 1162 * if BRANCH_STACK bit is set. 1163 */ 1164 if (opts->initial_delay && is_dummy_event(evsel)) 1165 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK); 1166 } 1167 1168 int perf_evsel__set_filter(struct evsel *evsel, const char *filter) 1169 { 1170 char *new_filter = strdup(filter); 1171 1172 if (new_filter != NULL) { 1173 free(evsel->filter); 1174 evsel->filter = new_filter; 1175 return 0; 1176 } 1177 1178 return -1; 1179 } 1180 1181 static int perf_evsel__append_filter(struct evsel *evsel, 1182 const char *fmt, const char *filter) 1183 { 1184 char *new_filter; 1185 1186 if (evsel->filter == NULL) 1187 return perf_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 perf_evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1199 { 1200 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter); 1201 } 1202 1203 int perf_evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1204 { 1205 return perf_evsel__append_filter(evsel, "%s,%s", filter); 1206 } 1207 1208 int evsel__enable(struct evsel *evsel) 1209 { 1210 int err = perf_evsel__enable(&evsel->core); 1211 1212 if (!err) 1213 evsel->disabled = false; 1214 1215 return err; 1216 } 1217 1218 int evsel__disable(struct evsel *evsel) 1219 { 1220 int err = perf_evsel__disable(&evsel->core); 1221 /* 1222 * We mark it disabled here so that tools that disable a event can 1223 * ignore events after they disable it. I.e. the ring buffer may have 1224 * already a few more events queued up before the kernel got the stop 1225 * request. 1226 */ 1227 if (!err) 1228 evsel->disabled = true; 1229 1230 return err; 1231 } 1232 1233 static void perf_evsel__free_config_terms(struct evsel *evsel) 1234 { 1235 struct perf_evsel_config_term *term, *h; 1236 1237 list_for_each_entry_safe(term, h, &evsel->config_terms, list) { 1238 list_del_init(&term->list); 1239 free(term); 1240 } 1241 } 1242 1243 void perf_evsel__exit(struct evsel *evsel) 1244 { 1245 assert(list_empty(&evsel->core.node)); 1246 assert(evsel->evlist == NULL); 1247 perf_evsel__free_counts(evsel); 1248 perf_evsel__free_fd(&evsel->core); 1249 perf_evsel__free_id(&evsel->core); 1250 perf_evsel__free_config_terms(evsel); 1251 cgroup__put(evsel->cgrp); 1252 perf_cpu_map__put(evsel->core.cpus); 1253 perf_cpu_map__put(evsel->core.own_cpus); 1254 perf_thread_map__put(evsel->core.threads); 1255 zfree(&evsel->group_name); 1256 zfree(&evsel->name); 1257 perf_evsel__object.fini(evsel); 1258 } 1259 1260 void evsel__delete(struct evsel *evsel) 1261 { 1262 perf_evsel__exit(evsel); 1263 free(evsel); 1264 } 1265 1266 void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread, 1267 struct perf_counts_values *count) 1268 { 1269 struct perf_counts_values tmp; 1270 1271 if (!evsel->prev_raw_counts) 1272 return; 1273 1274 if (cpu == -1) { 1275 tmp = evsel->prev_raw_counts->aggr; 1276 evsel->prev_raw_counts->aggr = *count; 1277 } else { 1278 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread); 1279 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count; 1280 } 1281 1282 count->val = count->val - tmp.val; 1283 count->ena = count->ena - tmp.ena; 1284 count->run = count->run - tmp.run; 1285 } 1286 1287 void perf_counts_values__scale(struct perf_counts_values *count, 1288 bool scale, s8 *pscaled) 1289 { 1290 s8 scaled = 0; 1291 1292 if (scale) { 1293 if (count->run == 0) { 1294 scaled = -1; 1295 count->val = 0; 1296 } else if (count->run < count->ena) { 1297 scaled = 1; 1298 count->val = (u64)((double) count->val * count->ena / count->run); 1299 } 1300 } 1301 1302 if (pscaled) 1303 *pscaled = scaled; 1304 } 1305 1306 static int 1307 perf_evsel__read_one(struct evsel *evsel, int cpu, int thread) 1308 { 1309 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread); 1310 1311 return perf_evsel__read(&evsel->core, cpu, thread, count); 1312 } 1313 1314 static void 1315 perf_evsel__set_count(struct evsel *counter, int cpu, int thread, 1316 u64 val, u64 ena, u64 run) 1317 { 1318 struct perf_counts_values *count; 1319 1320 count = perf_counts(counter->counts, cpu, thread); 1321 1322 count->val = val; 1323 count->ena = ena; 1324 count->run = run; 1325 1326 perf_counts__set_loaded(counter->counts, cpu, thread, true); 1327 } 1328 1329 static int 1330 perf_evsel__process_group_data(struct evsel *leader, 1331 int cpu, int thread, u64 *data) 1332 { 1333 u64 read_format = leader->core.attr.read_format; 1334 struct sample_read_value *v; 1335 u64 nr, ena = 0, run = 0, i; 1336 1337 nr = *data++; 1338 1339 if (nr != (u64) leader->core.nr_members) 1340 return -EINVAL; 1341 1342 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1343 ena = *data++; 1344 1345 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1346 run = *data++; 1347 1348 v = (struct sample_read_value *) data; 1349 1350 perf_evsel__set_count(leader, cpu, thread, 1351 v[0].value, ena, run); 1352 1353 for (i = 1; i < nr; i++) { 1354 struct evsel *counter; 1355 1356 counter = perf_evlist__id2evsel(leader->evlist, v[i].id); 1357 if (!counter) 1358 return -EINVAL; 1359 1360 perf_evsel__set_count(counter, cpu, thread, 1361 v[i].value, ena, run); 1362 } 1363 1364 return 0; 1365 } 1366 1367 static int 1368 perf_evsel__read_group(struct evsel *leader, int cpu, int thread) 1369 { 1370 struct perf_stat_evsel *ps = leader->stats; 1371 u64 read_format = leader->core.attr.read_format; 1372 int size = perf_evsel__read_size(&leader->core); 1373 u64 *data = ps->group_data; 1374 1375 if (!(read_format & PERF_FORMAT_ID)) 1376 return -EINVAL; 1377 1378 if (!perf_evsel__is_group_leader(leader)) 1379 return -EINVAL; 1380 1381 if (!data) { 1382 data = zalloc(size); 1383 if (!data) 1384 return -ENOMEM; 1385 1386 ps->group_data = data; 1387 } 1388 1389 if (FD(leader, cpu, thread) < 0) 1390 return -EINVAL; 1391 1392 if (readn(FD(leader, cpu, thread), data, size) <= 0) 1393 return -errno; 1394 1395 return perf_evsel__process_group_data(leader, cpu, thread, data); 1396 } 1397 1398 int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread) 1399 { 1400 u64 read_format = evsel->core.attr.read_format; 1401 1402 if (read_format & PERF_FORMAT_GROUP) 1403 return perf_evsel__read_group(evsel, cpu, thread); 1404 else 1405 return perf_evsel__read_one(evsel, cpu, thread); 1406 } 1407 1408 int __perf_evsel__read_on_cpu(struct evsel *evsel, 1409 int cpu, int thread, bool scale) 1410 { 1411 struct perf_counts_values count; 1412 size_t nv = scale ? 3 : 1; 1413 1414 if (FD(evsel, cpu, thread) < 0) 1415 return -EINVAL; 1416 1417 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0) 1418 return -ENOMEM; 1419 1420 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0) 1421 return -errno; 1422 1423 perf_evsel__compute_deltas(evsel, cpu, thread, &count); 1424 perf_counts_values__scale(&count, scale, NULL); 1425 *perf_counts(evsel->counts, cpu, thread) = count; 1426 return 0; 1427 } 1428 1429 static int get_group_fd(struct evsel *evsel, int cpu, int thread) 1430 { 1431 struct evsel *leader = evsel->leader; 1432 int fd; 1433 1434 if (perf_evsel__is_group_leader(evsel)) 1435 return -1; 1436 1437 /* 1438 * Leader must be already processed/open, 1439 * if not it's a bug. 1440 */ 1441 BUG_ON(!leader->core.fd); 1442 1443 fd = FD(leader, cpu, thread); 1444 BUG_ON(fd == -1); 1445 1446 return fd; 1447 } 1448 1449 static void perf_evsel__remove_fd(struct evsel *pos, 1450 int nr_cpus, int nr_threads, 1451 int thread_idx) 1452 { 1453 for (int cpu = 0; cpu < nr_cpus; cpu++) 1454 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1455 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1456 } 1457 1458 static int update_fds(struct evsel *evsel, 1459 int nr_cpus, int cpu_idx, 1460 int nr_threads, int thread_idx) 1461 { 1462 struct evsel *pos; 1463 1464 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads) 1465 return -EINVAL; 1466 1467 evlist__for_each_entry(evsel->evlist, pos) { 1468 nr_cpus = pos != evsel ? nr_cpus : cpu_idx; 1469 1470 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1471 1472 /* 1473 * Since fds for next evsel has not been created, 1474 * there is no need to iterate whole event list. 1475 */ 1476 if (pos == evsel) 1477 break; 1478 } 1479 return 0; 1480 } 1481 1482 static bool ignore_missing_thread(struct evsel *evsel, 1483 int nr_cpus, int cpu, 1484 struct perf_thread_map *threads, 1485 int thread, int err) 1486 { 1487 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1488 1489 if (!evsel->ignore_missing_thread) 1490 return false; 1491 1492 /* The system wide setup does not work with threads. */ 1493 if (evsel->core.system_wide) 1494 return false; 1495 1496 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1497 if (err != -ESRCH) 1498 return false; 1499 1500 /* If there's only one thread, let it fail. */ 1501 if (threads->nr == 1) 1502 return false; 1503 1504 /* 1505 * We should remove fd for missing_thread first 1506 * because thread_map__remove() will decrease threads->nr. 1507 */ 1508 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread)) 1509 return false; 1510 1511 if (thread_map__remove(threads, thread)) 1512 return false; 1513 1514 pr_warning("WARNING: Ignored open failure for pid %d\n", 1515 ignore_pid); 1516 return true; 1517 } 1518 1519 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1520 void *priv __maybe_unused) 1521 { 1522 return fprintf(fp, " %-32s %s\n", name, val); 1523 } 1524 1525 static void display_attr(struct perf_event_attr *attr) 1526 { 1527 if (verbose >= 2) { 1528 fprintf(stderr, "%.60s\n", graph_dotted_line); 1529 fprintf(stderr, "perf_event_attr:\n"); 1530 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 1531 fprintf(stderr, "%.60s\n", graph_dotted_line); 1532 } 1533 } 1534 1535 static int perf_event_open(struct evsel *evsel, 1536 pid_t pid, int cpu, int group_fd, 1537 unsigned long flags) 1538 { 1539 int precise_ip = evsel->core.attr.precise_ip; 1540 int fd; 1541 1542 while (1) { 1543 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 1544 pid, cpu, group_fd, flags); 1545 1546 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags); 1547 if (fd >= 0) 1548 break; 1549 1550 /* Do not try less precise if not requested. */ 1551 if (!evsel->precise_max) 1552 break; 1553 1554 /* 1555 * We tried all the precise_ip values, and it's 1556 * still failing, so leave it to standard fallback. 1557 */ 1558 if (!evsel->core.attr.precise_ip) { 1559 evsel->core.attr.precise_ip = precise_ip; 1560 break; 1561 } 1562 1563 pr_debug2("\nsys_perf_event_open failed, error %d\n", -ENOTSUP); 1564 evsel->core.attr.precise_ip--; 1565 pr_debug2("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 1566 display_attr(&evsel->core.attr); 1567 } 1568 1569 return fd; 1570 } 1571 1572 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 1573 struct perf_thread_map *threads) 1574 { 1575 int cpu, thread, nthreads; 1576 unsigned long flags = PERF_FLAG_FD_CLOEXEC; 1577 int pid = -1, err, old_errno; 1578 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE; 1579 1580 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 1581 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 1582 return -EINVAL; 1583 1584 if (cpus == NULL) { 1585 static struct perf_cpu_map *empty_cpu_map; 1586 1587 if (empty_cpu_map == NULL) { 1588 empty_cpu_map = perf_cpu_map__dummy_new(); 1589 if (empty_cpu_map == NULL) 1590 return -ENOMEM; 1591 } 1592 1593 cpus = empty_cpu_map; 1594 } 1595 1596 if (threads == NULL) { 1597 static struct perf_thread_map *empty_thread_map; 1598 1599 if (empty_thread_map == NULL) { 1600 empty_thread_map = thread_map__new_by_tid(-1); 1601 if (empty_thread_map == NULL) 1602 return -ENOMEM; 1603 } 1604 1605 threads = empty_thread_map; 1606 } 1607 1608 if (evsel->core.system_wide) 1609 nthreads = 1; 1610 else 1611 nthreads = threads->nr; 1612 1613 if (evsel->core.fd == NULL && 1614 perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0) 1615 return -ENOMEM; 1616 1617 if (evsel->cgrp) { 1618 flags |= PERF_FLAG_PID_CGROUP; 1619 pid = evsel->cgrp->fd; 1620 } 1621 1622 fallback_missing_features: 1623 if (perf_missing_features.clockid_wrong) 1624 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1625 if (perf_missing_features.clockid) { 1626 evsel->core.attr.use_clockid = 0; 1627 evsel->core.attr.clockid = 0; 1628 } 1629 if (perf_missing_features.cloexec) 1630 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1631 if (perf_missing_features.mmap2) 1632 evsel->core.attr.mmap2 = 0; 1633 if (perf_missing_features.exclude_guest) 1634 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 1635 if (perf_missing_features.lbr_flags) 1636 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 1637 PERF_SAMPLE_BRANCH_NO_CYCLES); 1638 if (perf_missing_features.group_read && evsel->core.attr.inherit) 1639 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 1640 if (perf_missing_features.ksymbol) 1641 evsel->core.attr.ksymbol = 0; 1642 if (perf_missing_features.bpf) 1643 evsel->core.attr.bpf_event = 0; 1644 retry_sample_id: 1645 if (perf_missing_features.sample_id_all) 1646 evsel->core.attr.sample_id_all = 0; 1647 1648 display_attr(&evsel->core.attr); 1649 1650 for (cpu = 0; cpu < cpus->nr; cpu++) { 1651 1652 for (thread = 0; thread < nthreads; thread++) { 1653 int fd, group_fd; 1654 1655 if (!evsel->cgrp && !evsel->core.system_wide) 1656 pid = perf_thread_map__pid(threads, thread); 1657 1658 group_fd = get_group_fd(evsel, cpu, thread); 1659 retry_open: 1660 test_attr__ready(); 1661 1662 fd = perf_event_open(evsel, pid, cpus->map[cpu], 1663 group_fd, flags); 1664 1665 FD(evsel, cpu, thread) = fd; 1666 1667 if (fd < 0) { 1668 err = -errno; 1669 1670 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) { 1671 /* 1672 * We just removed 1 thread, so take a step 1673 * back on thread index and lower the upper 1674 * nthreads limit. 1675 */ 1676 nthreads--; 1677 thread--; 1678 1679 /* ... and pretend like nothing have happened. */ 1680 err = 0; 1681 continue; 1682 } 1683 1684 pr_debug2("\nsys_perf_event_open failed, error %d\n", 1685 err); 1686 goto try_fallback; 1687 } 1688 1689 pr_debug2(" = %d\n", fd); 1690 1691 if (evsel->bpf_fd >= 0) { 1692 int evt_fd = fd; 1693 int bpf_fd = evsel->bpf_fd; 1694 1695 err = ioctl(evt_fd, 1696 PERF_EVENT_IOC_SET_BPF, 1697 bpf_fd); 1698 if (err && errno != EEXIST) { 1699 pr_err("failed to attach bpf fd %d: %s\n", 1700 bpf_fd, strerror(errno)); 1701 err = -EINVAL; 1702 goto out_close; 1703 } 1704 } 1705 1706 set_rlimit = NO_CHANGE; 1707 1708 /* 1709 * If we succeeded but had to kill clockid, fail and 1710 * have perf_evsel__open_strerror() print us a nice 1711 * error. 1712 */ 1713 if (perf_missing_features.clockid || 1714 perf_missing_features.clockid_wrong) { 1715 err = -EINVAL; 1716 goto out_close; 1717 } 1718 } 1719 } 1720 1721 return 0; 1722 1723 try_fallback: 1724 /* 1725 * perf stat needs between 5 and 22 fds per CPU. When we run out 1726 * of them try to increase the limits. 1727 */ 1728 if (err == -EMFILE && set_rlimit < INCREASED_MAX) { 1729 struct rlimit l; 1730 1731 old_errno = errno; 1732 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 1733 if (set_rlimit == NO_CHANGE) 1734 l.rlim_cur = l.rlim_max; 1735 else { 1736 l.rlim_cur = l.rlim_max + 1000; 1737 l.rlim_max = l.rlim_cur; 1738 } 1739 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 1740 set_rlimit++; 1741 errno = old_errno; 1742 goto retry_open; 1743 } 1744 } 1745 errno = old_errno; 1746 } 1747 1748 if (err != -EINVAL || cpu > 0 || thread > 0) 1749 goto out_close; 1750 1751 /* 1752 * Must probe features in the order they were added to the 1753 * perf_event_attr interface. 1754 */ 1755 if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 1756 perf_missing_features.aux_output = true; 1757 pr_debug2("Kernel has no attr.aux_output support, bailing out\n"); 1758 goto out_close; 1759 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 1760 perf_missing_features.bpf = true; 1761 pr_debug2("switching off bpf_event\n"); 1762 goto fallback_missing_features; 1763 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 1764 perf_missing_features.ksymbol = true; 1765 pr_debug2("switching off ksymbol\n"); 1766 goto fallback_missing_features; 1767 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 1768 perf_missing_features.write_backward = true; 1769 pr_debug2("switching off write_backward\n"); 1770 goto out_close; 1771 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 1772 perf_missing_features.clockid_wrong = true; 1773 pr_debug2("switching off clockid\n"); 1774 goto fallback_missing_features; 1775 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 1776 perf_missing_features.clockid = true; 1777 pr_debug2("switching off use_clockid\n"); 1778 goto fallback_missing_features; 1779 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { 1780 perf_missing_features.cloexec = true; 1781 pr_debug2("switching off cloexec flag\n"); 1782 goto fallback_missing_features; 1783 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 1784 perf_missing_features.mmap2 = true; 1785 pr_debug2("switching off mmap2\n"); 1786 goto fallback_missing_features; 1787 } else if (!perf_missing_features.exclude_guest && 1788 (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) { 1789 perf_missing_features.exclude_guest = true; 1790 pr_debug2("switching off exclude_guest, exclude_host\n"); 1791 goto fallback_missing_features; 1792 } else if (!perf_missing_features.sample_id_all) { 1793 perf_missing_features.sample_id_all = true; 1794 pr_debug2("switching off sample_id_all\n"); 1795 goto retry_sample_id; 1796 } else if (!perf_missing_features.lbr_flags && 1797 (evsel->core.attr.branch_sample_type & 1798 (PERF_SAMPLE_BRANCH_NO_CYCLES | 1799 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 1800 perf_missing_features.lbr_flags = true; 1801 pr_debug2("switching off branch sample type no (cycles/flags)\n"); 1802 goto fallback_missing_features; 1803 } else if (!perf_missing_features.group_read && 1804 evsel->core.attr.inherit && 1805 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 1806 perf_evsel__is_group_leader(evsel)) { 1807 perf_missing_features.group_read = true; 1808 pr_debug2("switching off group read\n"); 1809 goto fallback_missing_features; 1810 } 1811 out_close: 1812 if (err) 1813 threads->err_thread = thread; 1814 1815 old_errno = errno; 1816 do { 1817 while (--thread >= 0) { 1818 if (FD(evsel, cpu, thread) >= 0) 1819 close(FD(evsel, cpu, thread)); 1820 FD(evsel, cpu, thread) = -1; 1821 } 1822 thread = nthreads; 1823 } while (--cpu >= 0); 1824 errno = old_errno; 1825 return err; 1826 } 1827 1828 void evsel__close(struct evsel *evsel) 1829 { 1830 perf_evsel__close(&evsel->core); 1831 perf_evsel__free_id(&evsel->core); 1832 } 1833 1834 int perf_evsel__open_per_cpu(struct evsel *evsel, 1835 struct perf_cpu_map *cpus) 1836 { 1837 return evsel__open(evsel, cpus, NULL); 1838 } 1839 1840 int perf_evsel__open_per_thread(struct evsel *evsel, 1841 struct perf_thread_map *threads) 1842 { 1843 return evsel__open(evsel, NULL, threads); 1844 } 1845 1846 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 1847 const union perf_event *event, 1848 struct perf_sample *sample) 1849 { 1850 u64 type = evsel->core.attr.sample_type; 1851 const __u64 *array = event->sample.array; 1852 bool swapped = evsel->needs_swap; 1853 union u64_swap u; 1854 1855 array += ((event->header.size - 1856 sizeof(event->header)) / sizeof(u64)) - 1; 1857 1858 if (type & PERF_SAMPLE_IDENTIFIER) { 1859 sample->id = *array; 1860 array--; 1861 } 1862 1863 if (type & PERF_SAMPLE_CPU) { 1864 u.val64 = *array; 1865 if (swapped) { 1866 /* undo swap of u64, then swap on individual u32s */ 1867 u.val64 = bswap_64(u.val64); 1868 u.val32[0] = bswap_32(u.val32[0]); 1869 } 1870 1871 sample->cpu = u.val32[0]; 1872 array--; 1873 } 1874 1875 if (type & PERF_SAMPLE_STREAM_ID) { 1876 sample->stream_id = *array; 1877 array--; 1878 } 1879 1880 if (type & PERF_SAMPLE_ID) { 1881 sample->id = *array; 1882 array--; 1883 } 1884 1885 if (type & PERF_SAMPLE_TIME) { 1886 sample->time = *array; 1887 array--; 1888 } 1889 1890 if (type & PERF_SAMPLE_TID) { 1891 u.val64 = *array; 1892 if (swapped) { 1893 /* undo swap of u64, then swap on individual u32s */ 1894 u.val64 = bswap_64(u.val64); 1895 u.val32[0] = bswap_32(u.val32[0]); 1896 u.val32[1] = bswap_32(u.val32[1]); 1897 } 1898 1899 sample->pid = u.val32[0]; 1900 sample->tid = u.val32[1]; 1901 array--; 1902 } 1903 1904 return 0; 1905 } 1906 1907 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 1908 u64 size) 1909 { 1910 return size > max_size || offset + size > endp; 1911 } 1912 1913 #define OVERFLOW_CHECK(offset, size, max_size) \ 1914 do { \ 1915 if (overflow(endp, (max_size), (offset), (size))) \ 1916 return -EFAULT; \ 1917 } while (0) 1918 1919 #define OVERFLOW_CHECK_u64(offset) \ 1920 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 1921 1922 static int 1923 perf_event__check_size(union perf_event *event, unsigned int sample_size) 1924 { 1925 /* 1926 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 1927 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 1928 * check the format does not go past the end of the event. 1929 */ 1930 if (sample_size + sizeof(event->header) > event->header.size) 1931 return -EFAULT; 1932 1933 return 0; 1934 } 1935 1936 int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event, 1937 struct perf_sample *data) 1938 { 1939 u64 type = evsel->core.attr.sample_type; 1940 bool swapped = evsel->needs_swap; 1941 const __u64 *array; 1942 u16 max_size = event->header.size; 1943 const void *endp = (void *)event + max_size; 1944 u64 sz; 1945 1946 /* 1947 * used for cross-endian analysis. See git commit 65014ab3 1948 * for why this goofiness is needed. 1949 */ 1950 union u64_swap u; 1951 1952 memset(data, 0, sizeof(*data)); 1953 data->cpu = data->pid = data->tid = -1; 1954 data->stream_id = data->id = data->time = -1ULL; 1955 data->period = evsel->core.attr.sample_period; 1956 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 1957 data->misc = event->header.misc; 1958 data->id = -1ULL; 1959 data->data_src = PERF_MEM_DATA_SRC_NONE; 1960 1961 if (event->header.type != PERF_RECORD_SAMPLE) { 1962 if (!evsel->core.attr.sample_id_all) 1963 return 0; 1964 return perf_evsel__parse_id_sample(evsel, event, data); 1965 } 1966 1967 array = event->sample.array; 1968 1969 if (perf_event__check_size(event, evsel->sample_size)) 1970 return -EFAULT; 1971 1972 if (type & PERF_SAMPLE_IDENTIFIER) { 1973 data->id = *array; 1974 array++; 1975 } 1976 1977 if (type & PERF_SAMPLE_IP) { 1978 data->ip = *array; 1979 array++; 1980 } 1981 1982 if (type & PERF_SAMPLE_TID) { 1983 u.val64 = *array; 1984 if (swapped) { 1985 /* undo swap of u64, then swap on individual u32s */ 1986 u.val64 = bswap_64(u.val64); 1987 u.val32[0] = bswap_32(u.val32[0]); 1988 u.val32[1] = bswap_32(u.val32[1]); 1989 } 1990 1991 data->pid = u.val32[0]; 1992 data->tid = u.val32[1]; 1993 array++; 1994 } 1995 1996 if (type & PERF_SAMPLE_TIME) { 1997 data->time = *array; 1998 array++; 1999 } 2000 2001 if (type & PERF_SAMPLE_ADDR) { 2002 data->addr = *array; 2003 array++; 2004 } 2005 2006 if (type & PERF_SAMPLE_ID) { 2007 data->id = *array; 2008 array++; 2009 } 2010 2011 if (type & PERF_SAMPLE_STREAM_ID) { 2012 data->stream_id = *array; 2013 array++; 2014 } 2015 2016 if (type & PERF_SAMPLE_CPU) { 2017 2018 u.val64 = *array; 2019 if (swapped) { 2020 /* undo swap of u64, then swap on individual u32s */ 2021 u.val64 = bswap_64(u.val64); 2022 u.val32[0] = bswap_32(u.val32[0]); 2023 } 2024 2025 data->cpu = u.val32[0]; 2026 array++; 2027 } 2028 2029 if (type & PERF_SAMPLE_PERIOD) { 2030 data->period = *array; 2031 array++; 2032 } 2033 2034 if (type & PERF_SAMPLE_READ) { 2035 u64 read_format = evsel->core.attr.read_format; 2036 2037 OVERFLOW_CHECK_u64(array); 2038 if (read_format & PERF_FORMAT_GROUP) 2039 data->read.group.nr = *array; 2040 else 2041 data->read.one.value = *array; 2042 2043 array++; 2044 2045 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2046 OVERFLOW_CHECK_u64(array); 2047 data->read.time_enabled = *array; 2048 array++; 2049 } 2050 2051 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2052 OVERFLOW_CHECK_u64(array); 2053 data->read.time_running = *array; 2054 array++; 2055 } 2056 2057 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2058 if (read_format & PERF_FORMAT_GROUP) { 2059 const u64 max_group_nr = UINT64_MAX / 2060 sizeof(struct sample_read_value); 2061 2062 if (data->read.group.nr > max_group_nr) 2063 return -EFAULT; 2064 sz = data->read.group.nr * 2065 sizeof(struct sample_read_value); 2066 OVERFLOW_CHECK(array, sz, max_size); 2067 data->read.group.values = 2068 (struct sample_read_value *)array; 2069 array = (void *)array + sz; 2070 } else { 2071 OVERFLOW_CHECK_u64(array); 2072 data->read.one.id = *array; 2073 array++; 2074 } 2075 } 2076 2077 if (evsel__has_callchain(evsel)) { 2078 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2079 2080 OVERFLOW_CHECK_u64(array); 2081 data->callchain = (struct ip_callchain *)array++; 2082 if (data->callchain->nr > max_callchain_nr) 2083 return -EFAULT; 2084 sz = data->callchain->nr * sizeof(u64); 2085 OVERFLOW_CHECK(array, sz, max_size); 2086 array = (void *)array + sz; 2087 } 2088 2089 if (type & PERF_SAMPLE_RAW) { 2090 OVERFLOW_CHECK_u64(array); 2091 u.val64 = *array; 2092 2093 /* 2094 * Undo swap of u64, then swap on individual u32s, 2095 * get the size of the raw area and undo all of the 2096 * swap. The pevent interface handles endianity by 2097 * itself. 2098 */ 2099 if (swapped) { 2100 u.val64 = bswap_64(u.val64); 2101 u.val32[0] = bswap_32(u.val32[0]); 2102 u.val32[1] = bswap_32(u.val32[1]); 2103 } 2104 data->raw_size = u.val32[0]; 2105 2106 /* 2107 * The raw data is aligned on 64bits including the 2108 * u32 size, so it's safe to use mem_bswap_64. 2109 */ 2110 if (swapped) 2111 mem_bswap_64((void *) array, data->raw_size); 2112 2113 array = (void *)array + sizeof(u32); 2114 2115 OVERFLOW_CHECK(array, data->raw_size, max_size); 2116 data->raw_data = (void *)array; 2117 array = (void *)array + data->raw_size; 2118 } 2119 2120 if (type & PERF_SAMPLE_BRANCH_STACK) { 2121 const u64 max_branch_nr = UINT64_MAX / 2122 sizeof(struct branch_entry); 2123 2124 OVERFLOW_CHECK_u64(array); 2125 data->branch_stack = (struct branch_stack *)array++; 2126 2127 if (data->branch_stack->nr > max_branch_nr) 2128 return -EFAULT; 2129 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2130 OVERFLOW_CHECK(array, sz, max_size); 2131 array = (void *)array + sz; 2132 } 2133 2134 if (type & PERF_SAMPLE_REGS_USER) { 2135 OVERFLOW_CHECK_u64(array); 2136 data->user_regs.abi = *array; 2137 array++; 2138 2139 if (data->user_regs.abi) { 2140 u64 mask = evsel->core.attr.sample_regs_user; 2141 2142 sz = hweight64(mask) * sizeof(u64); 2143 OVERFLOW_CHECK(array, sz, max_size); 2144 data->user_regs.mask = mask; 2145 data->user_regs.regs = (u64 *)array; 2146 array = (void *)array + sz; 2147 } 2148 } 2149 2150 if (type & PERF_SAMPLE_STACK_USER) { 2151 OVERFLOW_CHECK_u64(array); 2152 sz = *array++; 2153 2154 data->user_stack.offset = ((char *)(array - 1) 2155 - (char *) event); 2156 2157 if (!sz) { 2158 data->user_stack.size = 0; 2159 } else { 2160 OVERFLOW_CHECK(array, sz, max_size); 2161 data->user_stack.data = (char *)array; 2162 array = (void *)array + sz; 2163 OVERFLOW_CHECK_u64(array); 2164 data->user_stack.size = *array++; 2165 if (WARN_ONCE(data->user_stack.size > sz, 2166 "user stack dump failure\n")) 2167 return -EFAULT; 2168 } 2169 } 2170 2171 if (type & PERF_SAMPLE_WEIGHT) { 2172 OVERFLOW_CHECK_u64(array); 2173 data->weight = *array; 2174 array++; 2175 } 2176 2177 if (type & PERF_SAMPLE_DATA_SRC) { 2178 OVERFLOW_CHECK_u64(array); 2179 data->data_src = *array; 2180 array++; 2181 } 2182 2183 if (type & PERF_SAMPLE_TRANSACTION) { 2184 OVERFLOW_CHECK_u64(array); 2185 data->transaction = *array; 2186 array++; 2187 } 2188 2189 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2190 if (type & PERF_SAMPLE_REGS_INTR) { 2191 OVERFLOW_CHECK_u64(array); 2192 data->intr_regs.abi = *array; 2193 array++; 2194 2195 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2196 u64 mask = evsel->core.attr.sample_regs_intr; 2197 2198 sz = hweight64(mask) * sizeof(u64); 2199 OVERFLOW_CHECK(array, sz, max_size); 2200 data->intr_regs.mask = mask; 2201 data->intr_regs.regs = (u64 *)array; 2202 array = (void *)array + sz; 2203 } 2204 } 2205 2206 data->phys_addr = 0; 2207 if (type & PERF_SAMPLE_PHYS_ADDR) { 2208 data->phys_addr = *array; 2209 array++; 2210 } 2211 2212 return 0; 2213 } 2214 2215 int perf_evsel__parse_sample_timestamp(struct evsel *evsel, 2216 union perf_event *event, 2217 u64 *timestamp) 2218 { 2219 u64 type = evsel->core.attr.sample_type; 2220 const __u64 *array; 2221 2222 if (!(type & PERF_SAMPLE_TIME)) 2223 return -1; 2224 2225 if (event->header.type != PERF_RECORD_SAMPLE) { 2226 struct perf_sample data = { 2227 .time = -1ULL, 2228 }; 2229 2230 if (!evsel->core.attr.sample_id_all) 2231 return -1; 2232 if (perf_evsel__parse_id_sample(evsel, event, &data)) 2233 return -1; 2234 2235 *timestamp = data.time; 2236 return 0; 2237 } 2238 2239 array = event->sample.array; 2240 2241 if (perf_event__check_size(event, evsel->sample_size)) 2242 return -EFAULT; 2243 2244 if (type & PERF_SAMPLE_IDENTIFIER) 2245 array++; 2246 2247 if (type & PERF_SAMPLE_IP) 2248 array++; 2249 2250 if (type & PERF_SAMPLE_TID) 2251 array++; 2252 2253 if (type & PERF_SAMPLE_TIME) 2254 *timestamp = *array; 2255 2256 return 0; 2257 } 2258 2259 struct tep_format_field *perf_evsel__field(struct evsel *evsel, const char *name) 2260 { 2261 return tep_find_field(evsel->tp_format, name); 2262 } 2263 2264 void *perf_evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, 2265 const char *name) 2266 { 2267 struct tep_format_field *field = perf_evsel__field(evsel, name); 2268 int offset; 2269 2270 if (!field) 2271 return NULL; 2272 2273 offset = field->offset; 2274 2275 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 2276 offset = *(int *)(sample->raw_data + field->offset); 2277 offset &= 0xffff; 2278 } 2279 2280 return sample->raw_data + offset; 2281 } 2282 2283 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 2284 bool needs_swap) 2285 { 2286 u64 value; 2287 void *ptr = sample->raw_data + field->offset; 2288 2289 switch (field->size) { 2290 case 1: 2291 return *(u8 *)ptr; 2292 case 2: 2293 value = *(u16 *)ptr; 2294 break; 2295 case 4: 2296 value = *(u32 *)ptr; 2297 break; 2298 case 8: 2299 memcpy(&value, ptr, sizeof(u64)); 2300 break; 2301 default: 2302 return 0; 2303 } 2304 2305 if (!needs_swap) 2306 return value; 2307 2308 switch (field->size) { 2309 case 2: 2310 return bswap_16(value); 2311 case 4: 2312 return bswap_32(value); 2313 case 8: 2314 return bswap_64(value); 2315 default: 2316 return 0; 2317 } 2318 2319 return 0; 2320 } 2321 2322 u64 perf_evsel__intval(struct evsel *evsel, struct perf_sample *sample, 2323 const char *name) 2324 { 2325 struct tep_format_field *field = perf_evsel__field(evsel, name); 2326 2327 if (!field) 2328 return 0; 2329 2330 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 2331 } 2332 2333 bool perf_evsel__fallback(struct evsel *evsel, int err, 2334 char *msg, size_t msgsize) 2335 { 2336 int paranoid; 2337 2338 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2339 evsel->core.attr.type == PERF_TYPE_HARDWARE && 2340 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2341 /* 2342 * If it's cycles then fall back to hrtimer based 2343 * cpu-clock-tick sw counter, which is always available even if 2344 * no PMU support. 2345 * 2346 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2347 * b0a873e). 2348 */ 2349 scnprintf(msg, msgsize, "%s", 2350 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2351 2352 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 2353 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK; 2354 2355 zfree(&evsel->name); 2356 return true; 2357 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 2358 (paranoid = perf_event_paranoid()) > 1) { 2359 const char *name = perf_evsel__name(evsel); 2360 char *new_name; 2361 const char *sep = ":"; 2362 2363 /* Is there already the separator in the name. */ 2364 if (strchr(name, '/') || 2365 strchr(name, ':')) 2366 sep = ""; 2367 2368 if (asprintf(&new_name, "%s%su", name, sep) < 0) 2369 return false; 2370 2371 if (evsel->name) 2372 free(evsel->name); 2373 evsel->name = new_name; 2374 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 2375 "to fall back to excluding kernel and hypervisor " 2376 " samples", paranoid); 2377 evsel->core.attr.exclude_kernel = 1; 2378 evsel->core.attr.exclude_hv = 1; 2379 2380 return true; 2381 } 2382 2383 return false; 2384 } 2385 2386 static bool find_process(const char *name) 2387 { 2388 size_t len = strlen(name); 2389 DIR *dir; 2390 struct dirent *d; 2391 int ret = -1; 2392 2393 dir = opendir(procfs__mountpoint()); 2394 if (!dir) 2395 return false; 2396 2397 /* Walk through the directory. */ 2398 while (ret && (d = readdir(dir)) != NULL) { 2399 char path[PATH_MAX]; 2400 char *data; 2401 size_t size; 2402 2403 if ((d->d_type != DT_DIR) || 2404 !strcmp(".", d->d_name) || 2405 !strcmp("..", d->d_name)) 2406 continue; 2407 2408 scnprintf(path, sizeof(path), "%s/%s/comm", 2409 procfs__mountpoint(), d->d_name); 2410 2411 if (filename__read_str(path, &data, &size)) 2412 continue; 2413 2414 ret = strncmp(name, data, len); 2415 free(data); 2416 } 2417 2418 closedir(dir); 2419 return ret ? false : true; 2420 } 2421 2422 int perf_evsel__open_strerror(struct evsel *evsel, struct target *target, 2423 int err, char *msg, size_t size) 2424 { 2425 char sbuf[STRERR_BUFSIZE]; 2426 int printed = 0; 2427 2428 switch (err) { 2429 case EPERM: 2430 case EACCES: 2431 if (err == EPERM) 2432 printed = scnprintf(msg, size, 2433 "No permission to enable %s event.\n\n", 2434 perf_evsel__name(evsel)); 2435 2436 return scnprintf(msg + printed, size - printed, 2437 "You may not have permission to collect %sstats.\n\n" 2438 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n" 2439 "which controls use of the performance events system by\n" 2440 "unprivileged users (without CAP_SYS_ADMIN).\n\n" 2441 "The current value is %d:\n\n" 2442 " -1: Allow use of (almost) all events by all users\n" 2443 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 2444 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n" 2445 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n" 2446 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n" 2447 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n" 2448 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n" 2449 " kernel.perf_event_paranoid = -1\n" , 2450 target->system_wide ? "system-wide " : "", 2451 perf_event_paranoid()); 2452 case ENOENT: 2453 return scnprintf(msg, size, "The %s event is not supported.", 2454 perf_evsel__name(evsel)); 2455 case EMFILE: 2456 return scnprintf(msg, size, "%s", 2457 "Too many events are opened.\n" 2458 "Probably the maximum number of open file descriptors has been reached.\n" 2459 "Hint: Try again after reducing the number of events.\n" 2460 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 2461 case ENOMEM: 2462 if (evsel__has_callchain(evsel) && 2463 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 2464 return scnprintf(msg, size, 2465 "Not enough memory to setup event with callchain.\n" 2466 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 2467 "Hint: Current value: %d", sysctl__max_stack()); 2468 break; 2469 case ENODEV: 2470 if (target->cpu_list) 2471 return scnprintf(msg, size, "%s", 2472 "No such device - did you specify an out-of-range profile CPU?"); 2473 break; 2474 case EOPNOTSUPP: 2475 if (evsel->core.attr.sample_period != 0) 2476 return scnprintf(msg, size, 2477 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 2478 perf_evsel__name(evsel)); 2479 if (evsel->core.attr.precise_ip) 2480 return scnprintf(msg, size, "%s", 2481 "\'precise\' request may not be supported. Try removing 'p' modifier."); 2482 #if defined(__i386__) || defined(__x86_64__) 2483 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 2484 return scnprintf(msg, size, "%s", 2485 "No hardware sampling interrupt available.\n"); 2486 #endif 2487 break; 2488 case EBUSY: 2489 if (find_process("oprofiled")) 2490 return scnprintf(msg, size, 2491 "The PMU counters are busy/taken by another profiler.\n" 2492 "We found oprofile daemon running, please stop it and try again."); 2493 break; 2494 case EINVAL: 2495 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 2496 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 2497 if (perf_missing_features.clockid) 2498 return scnprintf(msg, size, "clockid feature not supported."); 2499 if (perf_missing_features.clockid_wrong) 2500 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 2501 if (perf_missing_features.aux_output) 2502 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 2503 break; 2504 default: 2505 break; 2506 } 2507 2508 return scnprintf(msg, size, 2509 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 2510 "/bin/dmesg | grep -i perf may provide additional information.\n", 2511 err, str_error_r(err, sbuf, sizeof(sbuf)), 2512 perf_evsel__name(evsel)); 2513 } 2514 2515 struct perf_env *perf_evsel__env(struct evsel *evsel) 2516 { 2517 if (evsel && evsel->evlist) 2518 return evsel->evlist->env; 2519 return &perf_env; 2520 } 2521 2522 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 2523 { 2524 int cpu, thread; 2525 2526 for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) { 2527 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 2528 thread++) { 2529 int fd = FD(evsel, cpu, thread); 2530 2531 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 2532 cpu, thread, fd) < 0) 2533 return -1; 2534 } 2535 } 2536 2537 return 0; 2538 } 2539 2540 int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 2541 { 2542 struct perf_cpu_map *cpus = evsel->core.cpus; 2543 struct perf_thread_map *threads = evsel->core.threads; 2544 2545 if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr)) 2546 return -ENOMEM; 2547 2548 return store_evsel_ids(evsel, evlist); 2549 } 2550