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 case PERF_EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE: 850 /* Already applied by auxtrace */ 851 break; 852 case PERF_EVSEL__CONFIG_TERM_CFG_CHG: 853 break; 854 default: 855 break; 856 } 857 } 858 859 /* User explicitly set per-event callgraph, clear the old setting and reset. */ 860 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) { 861 bool sample_address = false; 862 863 if (max_stack) { 864 param.max_stack = max_stack; 865 if (callgraph_buf == NULL) 866 callgraph_buf = "fp"; 867 } 868 869 /* parse callgraph parameters */ 870 if (callgraph_buf != NULL) { 871 if (!strcmp(callgraph_buf, "no")) { 872 param.enabled = false; 873 param.record_mode = CALLCHAIN_NONE; 874 } else { 875 param.enabled = true; 876 if (parse_callchain_record(callgraph_buf, ¶m)) { 877 pr_err("per-event callgraph setting for %s failed. " 878 "Apply callgraph global setting for it\n", 879 evsel->name); 880 return; 881 } 882 if (param.record_mode == CALLCHAIN_DWARF) 883 sample_address = true; 884 } 885 } 886 if (dump_size > 0) { 887 dump_size = round_up(dump_size, sizeof(u64)); 888 param.dump_size = dump_size; 889 } 890 891 /* If global callgraph set, clear it */ 892 if (callchain_param.enabled) 893 perf_evsel__reset_callgraph(evsel, &callchain_param); 894 895 /* set perf-event callgraph */ 896 if (param.enabled) { 897 if (sample_address) { 898 perf_evsel__set_sample_bit(evsel, ADDR); 899 perf_evsel__set_sample_bit(evsel, DATA_SRC); 900 evsel->core.attr.mmap_data = track; 901 } 902 perf_evsel__config_callchain(evsel, opts, ¶m); 903 } 904 } 905 } 906 907 static bool is_dummy_event(struct evsel *evsel) 908 { 909 return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) && 910 (evsel->core.attr.config == PERF_COUNT_SW_DUMMY); 911 } 912 913 struct perf_evsel_config_term *__perf_evsel__get_config_term(struct evsel *evsel, 914 enum evsel_term_type type) 915 { 916 struct perf_evsel_config_term *term, *found_term = NULL; 917 918 list_for_each_entry(term, &evsel->config_terms, list) { 919 if (term->type == type) 920 found_term = term; 921 } 922 923 return found_term; 924 } 925 926 /* 927 * The enable_on_exec/disabled value strategy: 928 * 929 * 1) For any type of traced program: 930 * - all independent events and group leaders are disabled 931 * - all group members are enabled 932 * 933 * Group members are ruled by group leaders. They need to 934 * be enabled, because the group scheduling relies on that. 935 * 936 * 2) For traced programs executed by perf: 937 * - all independent events and group leaders have 938 * enable_on_exec set 939 * - we don't specifically enable or disable any event during 940 * the record command 941 * 942 * Independent events and group leaders are initially disabled 943 * and get enabled by exec. Group members are ruled by group 944 * leaders as stated in 1). 945 * 946 * 3) For traced programs attached by perf (pid/tid): 947 * - we specifically enable or disable all events during 948 * the record command 949 * 950 * When attaching events to already running traced we 951 * enable/disable events specifically, as there's no 952 * initial traced exec call. 953 */ 954 void perf_evsel__config(struct evsel *evsel, struct record_opts *opts, 955 struct callchain_param *callchain) 956 { 957 struct evsel *leader = evsel->leader; 958 struct perf_event_attr *attr = &evsel->core.attr; 959 int track = evsel->tracking; 960 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 961 962 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 963 attr->inherit = !opts->no_inherit; 964 attr->write_backward = opts->overwrite ? 1 : 0; 965 966 perf_evsel__set_sample_bit(evsel, IP); 967 perf_evsel__set_sample_bit(evsel, TID); 968 969 if (evsel->sample_read) { 970 perf_evsel__set_sample_bit(evsel, READ); 971 972 /* 973 * We need ID even in case of single event, because 974 * PERF_SAMPLE_READ process ID specific data. 975 */ 976 perf_evsel__set_sample_id(evsel, false); 977 978 /* 979 * Apply group format only if we belong to group 980 * with more than one members. 981 */ 982 if (leader->core.nr_members > 1) { 983 attr->read_format |= PERF_FORMAT_GROUP; 984 attr->inherit = 0; 985 } 986 } 987 988 /* 989 * We default some events to have a default interval. But keep 990 * it a weak assumption overridable by the user. 991 */ 992 if (!attr->sample_period || (opts->user_freq != UINT_MAX || 993 opts->user_interval != ULLONG_MAX)) { 994 if (opts->freq) { 995 perf_evsel__set_sample_bit(evsel, PERIOD); 996 attr->freq = 1; 997 attr->sample_freq = opts->freq; 998 } else { 999 attr->sample_period = opts->default_interval; 1000 } 1001 } 1002 1003 /* 1004 * Disable sampling for all group members other 1005 * than leader in case leader 'leads' the sampling. 1006 */ 1007 if ((leader != evsel) && leader->sample_read) { 1008 attr->freq = 0; 1009 attr->sample_freq = 0; 1010 attr->sample_period = 0; 1011 attr->write_backward = 0; 1012 1013 /* 1014 * We don't get sample for slave events, we make them 1015 * when delivering group leader sample. Set the slave 1016 * event to follow the master sample_type to ease up 1017 * report. 1018 */ 1019 attr->sample_type = leader->core.attr.sample_type; 1020 } 1021 1022 if (opts->no_samples) 1023 attr->sample_freq = 0; 1024 1025 if (opts->inherit_stat) { 1026 evsel->core.attr.read_format |= 1027 PERF_FORMAT_TOTAL_TIME_ENABLED | 1028 PERF_FORMAT_TOTAL_TIME_RUNNING | 1029 PERF_FORMAT_ID; 1030 attr->inherit_stat = 1; 1031 } 1032 1033 if (opts->sample_address) { 1034 perf_evsel__set_sample_bit(evsel, ADDR); 1035 attr->mmap_data = track; 1036 } 1037 1038 /* 1039 * We don't allow user space callchains for function trace 1040 * event, due to issues with page faults while tracing page 1041 * fault handler and its overall trickiness nature. 1042 */ 1043 if (perf_evsel__is_function_event(evsel)) 1044 evsel->core.attr.exclude_callchain_user = 1; 1045 1046 if (callchain && callchain->enabled && !evsel->no_aux_samples) 1047 perf_evsel__config_callchain(evsel, opts, callchain); 1048 1049 if (opts->sample_intr_regs) { 1050 attr->sample_regs_intr = opts->sample_intr_regs; 1051 perf_evsel__set_sample_bit(evsel, REGS_INTR); 1052 } 1053 1054 if (opts->sample_user_regs) { 1055 attr->sample_regs_user |= opts->sample_user_regs; 1056 perf_evsel__set_sample_bit(evsel, REGS_USER); 1057 } 1058 1059 if (target__has_cpu(&opts->target) || opts->sample_cpu) 1060 perf_evsel__set_sample_bit(evsel, CPU); 1061 1062 /* 1063 * When the user explicitly disabled time don't force it here. 1064 */ 1065 if (opts->sample_time && 1066 (!perf_missing_features.sample_id_all && 1067 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu || 1068 opts->sample_time_set))) 1069 perf_evsel__set_sample_bit(evsel, TIME); 1070 1071 if (opts->raw_samples && !evsel->no_aux_samples) { 1072 perf_evsel__set_sample_bit(evsel, TIME); 1073 perf_evsel__set_sample_bit(evsel, RAW); 1074 perf_evsel__set_sample_bit(evsel, CPU); 1075 } 1076 1077 if (opts->sample_address) 1078 perf_evsel__set_sample_bit(evsel, DATA_SRC); 1079 1080 if (opts->sample_phys_addr) 1081 perf_evsel__set_sample_bit(evsel, PHYS_ADDR); 1082 1083 if (opts->no_buffering) { 1084 attr->watermark = 0; 1085 attr->wakeup_events = 1; 1086 } 1087 if (opts->branch_stack && !evsel->no_aux_samples) { 1088 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 1089 attr->branch_sample_type = opts->branch_stack; 1090 } 1091 1092 if (opts->sample_weight) 1093 perf_evsel__set_sample_bit(evsel, WEIGHT); 1094 1095 attr->task = track; 1096 attr->mmap = track; 1097 attr->mmap2 = track && !perf_missing_features.mmap2; 1098 attr->comm = track; 1099 attr->ksymbol = track && !perf_missing_features.ksymbol; 1100 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf; 1101 1102 if (opts->record_namespaces) 1103 attr->namespaces = track; 1104 1105 if (opts->record_switch_events) 1106 attr->context_switch = track; 1107 1108 if (opts->sample_transaction) 1109 perf_evsel__set_sample_bit(evsel, TRANSACTION); 1110 1111 if (opts->running_time) { 1112 evsel->core.attr.read_format |= 1113 PERF_FORMAT_TOTAL_TIME_ENABLED | 1114 PERF_FORMAT_TOTAL_TIME_RUNNING; 1115 } 1116 1117 /* 1118 * XXX see the function comment above 1119 * 1120 * Disabling only independent events or group leaders, 1121 * keeping group members enabled. 1122 */ 1123 if (perf_evsel__is_group_leader(evsel)) 1124 attr->disabled = 1; 1125 1126 /* 1127 * Setting enable_on_exec for independent events and 1128 * group leaders for traced executed by perf. 1129 */ 1130 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) && 1131 !opts->initial_delay) 1132 attr->enable_on_exec = 1; 1133 1134 if (evsel->immediate) { 1135 attr->disabled = 0; 1136 attr->enable_on_exec = 0; 1137 } 1138 1139 clockid = opts->clockid; 1140 if (opts->use_clockid) { 1141 attr->use_clockid = 1; 1142 attr->clockid = opts->clockid; 1143 } 1144 1145 if (evsel->precise_max) 1146 attr->precise_ip = 3; 1147 1148 if (opts->all_user) { 1149 attr->exclude_kernel = 1; 1150 attr->exclude_user = 0; 1151 } 1152 1153 if (opts->all_kernel) { 1154 attr->exclude_kernel = 0; 1155 attr->exclude_user = 1; 1156 } 1157 1158 if (evsel->core.own_cpus || evsel->unit) 1159 evsel->core.attr.read_format |= PERF_FORMAT_ID; 1160 1161 /* 1162 * Apply event specific term settings, 1163 * it overloads any global configuration. 1164 */ 1165 apply_config_terms(evsel, opts, track); 1166 1167 evsel->ignore_missing_thread = opts->ignore_missing_thread; 1168 1169 /* The --period option takes the precedence. */ 1170 if (opts->period_set) { 1171 if (opts->period) 1172 perf_evsel__set_sample_bit(evsel, PERIOD); 1173 else 1174 perf_evsel__reset_sample_bit(evsel, PERIOD); 1175 } 1176 1177 /* 1178 * For initial_delay, a dummy event is added implicitly. 1179 * The software event will trigger -EOPNOTSUPP error out, 1180 * if BRANCH_STACK bit is set. 1181 */ 1182 if (opts->initial_delay && is_dummy_event(evsel)) 1183 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK); 1184 } 1185 1186 int perf_evsel__set_filter(struct evsel *evsel, const char *filter) 1187 { 1188 char *new_filter = strdup(filter); 1189 1190 if (new_filter != NULL) { 1191 free(evsel->filter); 1192 evsel->filter = new_filter; 1193 return 0; 1194 } 1195 1196 return -1; 1197 } 1198 1199 static int perf_evsel__append_filter(struct evsel *evsel, 1200 const char *fmt, const char *filter) 1201 { 1202 char *new_filter; 1203 1204 if (evsel->filter == NULL) 1205 return perf_evsel__set_filter(evsel, filter); 1206 1207 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) { 1208 free(evsel->filter); 1209 evsel->filter = new_filter; 1210 return 0; 1211 } 1212 1213 return -1; 1214 } 1215 1216 int perf_evsel__append_tp_filter(struct evsel *evsel, const char *filter) 1217 { 1218 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter); 1219 } 1220 1221 int perf_evsel__append_addr_filter(struct evsel *evsel, const char *filter) 1222 { 1223 return perf_evsel__append_filter(evsel, "%s,%s", filter); 1224 } 1225 1226 int evsel__enable(struct evsel *evsel) 1227 { 1228 int err = perf_evsel__enable(&evsel->core); 1229 1230 if (!err) 1231 evsel->disabled = false; 1232 1233 return err; 1234 } 1235 1236 int evsel__disable(struct evsel *evsel) 1237 { 1238 int err = perf_evsel__disable(&evsel->core); 1239 /* 1240 * We mark it disabled here so that tools that disable a event can 1241 * ignore events after they disable it. I.e. the ring buffer may have 1242 * already a few more events queued up before the kernel got the stop 1243 * request. 1244 */ 1245 if (!err) 1246 evsel->disabled = true; 1247 1248 return err; 1249 } 1250 1251 static void perf_evsel__free_config_terms(struct evsel *evsel) 1252 { 1253 struct perf_evsel_config_term *term, *h; 1254 1255 list_for_each_entry_safe(term, h, &evsel->config_terms, list) { 1256 list_del_init(&term->list); 1257 free(term); 1258 } 1259 } 1260 1261 void perf_evsel__exit(struct evsel *evsel) 1262 { 1263 assert(list_empty(&evsel->core.node)); 1264 assert(evsel->evlist == NULL); 1265 perf_evsel__free_counts(evsel); 1266 perf_evsel__free_fd(&evsel->core); 1267 perf_evsel__free_id(&evsel->core); 1268 perf_evsel__free_config_terms(evsel); 1269 cgroup__put(evsel->cgrp); 1270 perf_cpu_map__put(evsel->core.cpus); 1271 perf_cpu_map__put(evsel->core.own_cpus); 1272 perf_thread_map__put(evsel->core.threads); 1273 zfree(&evsel->group_name); 1274 zfree(&evsel->name); 1275 perf_evsel__object.fini(evsel); 1276 } 1277 1278 void evsel__delete(struct evsel *evsel) 1279 { 1280 perf_evsel__exit(evsel); 1281 free(evsel); 1282 } 1283 1284 void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread, 1285 struct perf_counts_values *count) 1286 { 1287 struct perf_counts_values tmp; 1288 1289 if (!evsel->prev_raw_counts) 1290 return; 1291 1292 if (cpu == -1) { 1293 tmp = evsel->prev_raw_counts->aggr; 1294 evsel->prev_raw_counts->aggr = *count; 1295 } else { 1296 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread); 1297 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count; 1298 } 1299 1300 count->val = count->val - tmp.val; 1301 count->ena = count->ena - tmp.ena; 1302 count->run = count->run - tmp.run; 1303 } 1304 1305 void perf_counts_values__scale(struct perf_counts_values *count, 1306 bool scale, s8 *pscaled) 1307 { 1308 s8 scaled = 0; 1309 1310 if (scale) { 1311 if (count->run == 0) { 1312 scaled = -1; 1313 count->val = 0; 1314 } else if (count->run < count->ena) { 1315 scaled = 1; 1316 count->val = (u64)((double) count->val * count->ena / count->run); 1317 } 1318 } 1319 1320 if (pscaled) 1321 *pscaled = scaled; 1322 } 1323 1324 static int 1325 perf_evsel__read_one(struct evsel *evsel, int cpu, int thread) 1326 { 1327 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread); 1328 1329 return perf_evsel__read(&evsel->core, cpu, thread, count); 1330 } 1331 1332 static void 1333 perf_evsel__set_count(struct evsel *counter, int cpu, int thread, 1334 u64 val, u64 ena, u64 run) 1335 { 1336 struct perf_counts_values *count; 1337 1338 count = perf_counts(counter->counts, cpu, thread); 1339 1340 count->val = val; 1341 count->ena = ena; 1342 count->run = run; 1343 1344 perf_counts__set_loaded(counter->counts, cpu, thread, true); 1345 } 1346 1347 static int 1348 perf_evsel__process_group_data(struct evsel *leader, 1349 int cpu, int thread, u64 *data) 1350 { 1351 u64 read_format = leader->core.attr.read_format; 1352 struct sample_read_value *v; 1353 u64 nr, ena = 0, run = 0, i; 1354 1355 nr = *data++; 1356 1357 if (nr != (u64) leader->core.nr_members) 1358 return -EINVAL; 1359 1360 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1361 ena = *data++; 1362 1363 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1364 run = *data++; 1365 1366 v = (struct sample_read_value *) data; 1367 1368 perf_evsel__set_count(leader, cpu, thread, 1369 v[0].value, ena, run); 1370 1371 for (i = 1; i < nr; i++) { 1372 struct evsel *counter; 1373 1374 counter = perf_evlist__id2evsel(leader->evlist, v[i].id); 1375 if (!counter) 1376 return -EINVAL; 1377 1378 perf_evsel__set_count(counter, cpu, thread, 1379 v[i].value, ena, run); 1380 } 1381 1382 return 0; 1383 } 1384 1385 static int 1386 perf_evsel__read_group(struct evsel *leader, int cpu, int thread) 1387 { 1388 struct perf_stat_evsel *ps = leader->stats; 1389 u64 read_format = leader->core.attr.read_format; 1390 int size = perf_evsel__read_size(&leader->core); 1391 u64 *data = ps->group_data; 1392 1393 if (!(read_format & PERF_FORMAT_ID)) 1394 return -EINVAL; 1395 1396 if (!perf_evsel__is_group_leader(leader)) 1397 return -EINVAL; 1398 1399 if (!data) { 1400 data = zalloc(size); 1401 if (!data) 1402 return -ENOMEM; 1403 1404 ps->group_data = data; 1405 } 1406 1407 if (FD(leader, cpu, thread) < 0) 1408 return -EINVAL; 1409 1410 if (readn(FD(leader, cpu, thread), data, size) <= 0) 1411 return -errno; 1412 1413 return perf_evsel__process_group_data(leader, cpu, thread, data); 1414 } 1415 1416 int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread) 1417 { 1418 u64 read_format = evsel->core.attr.read_format; 1419 1420 if (read_format & PERF_FORMAT_GROUP) 1421 return perf_evsel__read_group(evsel, cpu, thread); 1422 else 1423 return perf_evsel__read_one(evsel, cpu, thread); 1424 } 1425 1426 int __perf_evsel__read_on_cpu(struct evsel *evsel, 1427 int cpu, int thread, bool scale) 1428 { 1429 struct perf_counts_values count; 1430 size_t nv = scale ? 3 : 1; 1431 1432 if (FD(evsel, cpu, thread) < 0) 1433 return -EINVAL; 1434 1435 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0) 1436 return -ENOMEM; 1437 1438 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0) 1439 return -errno; 1440 1441 perf_evsel__compute_deltas(evsel, cpu, thread, &count); 1442 perf_counts_values__scale(&count, scale, NULL); 1443 *perf_counts(evsel->counts, cpu, thread) = count; 1444 return 0; 1445 } 1446 1447 static int get_group_fd(struct evsel *evsel, int cpu, int thread) 1448 { 1449 struct evsel *leader = evsel->leader; 1450 int fd; 1451 1452 if (perf_evsel__is_group_leader(evsel)) 1453 return -1; 1454 1455 /* 1456 * Leader must be already processed/open, 1457 * if not it's a bug. 1458 */ 1459 BUG_ON(!leader->core.fd); 1460 1461 fd = FD(leader, cpu, thread); 1462 BUG_ON(fd == -1); 1463 1464 return fd; 1465 } 1466 1467 static void perf_evsel__remove_fd(struct evsel *pos, 1468 int nr_cpus, int nr_threads, 1469 int thread_idx) 1470 { 1471 for (int cpu = 0; cpu < nr_cpus; cpu++) 1472 for (int thread = thread_idx; thread < nr_threads - 1; thread++) 1473 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); 1474 } 1475 1476 static int update_fds(struct evsel *evsel, 1477 int nr_cpus, int cpu_idx, 1478 int nr_threads, int thread_idx) 1479 { 1480 struct evsel *pos; 1481 1482 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads) 1483 return -EINVAL; 1484 1485 evlist__for_each_entry(evsel->evlist, pos) { 1486 nr_cpus = pos != evsel ? nr_cpus : cpu_idx; 1487 1488 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); 1489 1490 /* 1491 * Since fds for next evsel has not been created, 1492 * there is no need to iterate whole event list. 1493 */ 1494 if (pos == evsel) 1495 break; 1496 } 1497 return 0; 1498 } 1499 1500 static bool ignore_missing_thread(struct evsel *evsel, 1501 int nr_cpus, int cpu, 1502 struct perf_thread_map *threads, 1503 int thread, int err) 1504 { 1505 pid_t ignore_pid = perf_thread_map__pid(threads, thread); 1506 1507 if (!evsel->ignore_missing_thread) 1508 return false; 1509 1510 /* The system wide setup does not work with threads. */ 1511 if (evsel->core.system_wide) 1512 return false; 1513 1514 /* The -ESRCH is perf event syscall errno for pid's not found. */ 1515 if (err != -ESRCH) 1516 return false; 1517 1518 /* If there's only one thread, let it fail. */ 1519 if (threads->nr == 1) 1520 return false; 1521 1522 /* 1523 * We should remove fd for missing_thread first 1524 * because thread_map__remove() will decrease threads->nr. 1525 */ 1526 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread)) 1527 return false; 1528 1529 if (thread_map__remove(threads, thread)) 1530 return false; 1531 1532 pr_warning("WARNING: Ignored open failure for pid %d\n", 1533 ignore_pid); 1534 return true; 1535 } 1536 1537 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1538 void *priv __maybe_unused) 1539 { 1540 return fprintf(fp, " %-32s %s\n", name, val); 1541 } 1542 1543 static void display_attr(struct perf_event_attr *attr) 1544 { 1545 if (verbose >= 2 || debug_peo_args) { 1546 fprintf(stderr, "%.60s\n", graph_dotted_line); 1547 fprintf(stderr, "perf_event_attr:\n"); 1548 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL); 1549 fprintf(stderr, "%.60s\n", graph_dotted_line); 1550 } 1551 } 1552 1553 static int perf_event_open(struct evsel *evsel, 1554 pid_t pid, int cpu, int group_fd, 1555 unsigned long flags) 1556 { 1557 int precise_ip = evsel->core.attr.precise_ip; 1558 int fd; 1559 1560 while (1) { 1561 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", 1562 pid, cpu, group_fd, flags); 1563 1564 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags); 1565 if (fd >= 0) 1566 break; 1567 1568 /* Do not try less precise if not requested. */ 1569 if (!evsel->precise_max) 1570 break; 1571 1572 /* 1573 * We tried all the precise_ip values, and it's 1574 * still failing, so leave it to standard fallback. 1575 */ 1576 if (!evsel->core.attr.precise_ip) { 1577 evsel->core.attr.precise_ip = precise_ip; 1578 break; 1579 } 1580 1581 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", -ENOTSUP); 1582 evsel->core.attr.precise_ip--; 1583 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip); 1584 display_attr(&evsel->core.attr); 1585 } 1586 1587 return fd; 1588 } 1589 1590 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, 1591 struct perf_thread_map *threads) 1592 { 1593 int cpu, thread, nthreads; 1594 unsigned long flags = PERF_FLAG_FD_CLOEXEC; 1595 int pid = -1, err, old_errno; 1596 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE; 1597 1598 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) || 1599 (perf_missing_features.aux_output && evsel->core.attr.aux_output)) 1600 return -EINVAL; 1601 1602 if (cpus == NULL) { 1603 static struct perf_cpu_map *empty_cpu_map; 1604 1605 if (empty_cpu_map == NULL) { 1606 empty_cpu_map = perf_cpu_map__dummy_new(); 1607 if (empty_cpu_map == NULL) 1608 return -ENOMEM; 1609 } 1610 1611 cpus = empty_cpu_map; 1612 } 1613 1614 if (threads == NULL) { 1615 static struct perf_thread_map *empty_thread_map; 1616 1617 if (empty_thread_map == NULL) { 1618 empty_thread_map = thread_map__new_by_tid(-1); 1619 if (empty_thread_map == NULL) 1620 return -ENOMEM; 1621 } 1622 1623 threads = empty_thread_map; 1624 } 1625 1626 if (evsel->core.system_wide) 1627 nthreads = 1; 1628 else 1629 nthreads = threads->nr; 1630 1631 if (evsel->core.fd == NULL && 1632 perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0) 1633 return -ENOMEM; 1634 1635 if (evsel->cgrp) { 1636 flags |= PERF_FLAG_PID_CGROUP; 1637 pid = evsel->cgrp->fd; 1638 } 1639 1640 fallback_missing_features: 1641 if (perf_missing_features.clockid_wrong) 1642 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1643 if (perf_missing_features.clockid) { 1644 evsel->core.attr.use_clockid = 0; 1645 evsel->core.attr.clockid = 0; 1646 } 1647 if (perf_missing_features.cloexec) 1648 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1649 if (perf_missing_features.mmap2) 1650 evsel->core.attr.mmap2 = 0; 1651 if (perf_missing_features.exclude_guest) 1652 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0; 1653 if (perf_missing_features.lbr_flags) 1654 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | 1655 PERF_SAMPLE_BRANCH_NO_CYCLES); 1656 if (perf_missing_features.group_read && evsel->core.attr.inherit) 1657 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID); 1658 if (perf_missing_features.ksymbol) 1659 evsel->core.attr.ksymbol = 0; 1660 if (perf_missing_features.bpf) 1661 evsel->core.attr.bpf_event = 0; 1662 retry_sample_id: 1663 if (perf_missing_features.sample_id_all) 1664 evsel->core.attr.sample_id_all = 0; 1665 1666 display_attr(&evsel->core.attr); 1667 1668 for (cpu = 0; cpu < cpus->nr; cpu++) { 1669 1670 for (thread = 0; thread < nthreads; thread++) { 1671 int fd, group_fd; 1672 1673 if (!evsel->cgrp && !evsel->core.system_wide) 1674 pid = perf_thread_map__pid(threads, thread); 1675 1676 group_fd = get_group_fd(evsel, cpu, thread); 1677 retry_open: 1678 test_attr__ready(); 1679 1680 fd = perf_event_open(evsel, pid, cpus->map[cpu], 1681 group_fd, flags); 1682 1683 FD(evsel, cpu, thread) = fd; 1684 1685 if (fd < 0) { 1686 err = -errno; 1687 1688 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) { 1689 /* 1690 * We just removed 1 thread, so take a step 1691 * back on thread index and lower the upper 1692 * nthreads limit. 1693 */ 1694 nthreads--; 1695 thread--; 1696 1697 /* ... and pretend like nothing have happened. */ 1698 err = 0; 1699 continue; 1700 } 1701 1702 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", 1703 err); 1704 goto try_fallback; 1705 } 1706 1707 pr_debug2_peo(" = %d\n", fd); 1708 1709 if (evsel->bpf_fd >= 0) { 1710 int evt_fd = fd; 1711 int bpf_fd = evsel->bpf_fd; 1712 1713 err = ioctl(evt_fd, 1714 PERF_EVENT_IOC_SET_BPF, 1715 bpf_fd); 1716 if (err && errno != EEXIST) { 1717 pr_err("failed to attach bpf fd %d: %s\n", 1718 bpf_fd, strerror(errno)); 1719 err = -EINVAL; 1720 goto out_close; 1721 } 1722 } 1723 1724 set_rlimit = NO_CHANGE; 1725 1726 /* 1727 * If we succeeded but had to kill clockid, fail and 1728 * have perf_evsel__open_strerror() print us a nice 1729 * error. 1730 */ 1731 if (perf_missing_features.clockid || 1732 perf_missing_features.clockid_wrong) { 1733 err = -EINVAL; 1734 goto out_close; 1735 } 1736 } 1737 } 1738 1739 return 0; 1740 1741 try_fallback: 1742 /* 1743 * perf stat needs between 5 and 22 fds per CPU. When we run out 1744 * of them try to increase the limits. 1745 */ 1746 if (err == -EMFILE && set_rlimit < INCREASED_MAX) { 1747 struct rlimit l; 1748 1749 old_errno = errno; 1750 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 1751 if (set_rlimit == NO_CHANGE) 1752 l.rlim_cur = l.rlim_max; 1753 else { 1754 l.rlim_cur = l.rlim_max + 1000; 1755 l.rlim_max = l.rlim_cur; 1756 } 1757 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 1758 set_rlimit++; 1759 errno = old_errno; 1760 goto retry_open; 1761 } 1762 } 1763 errno = old_errno; 1764 } 1765 1766 if (err != -EINVAL || cpu > 0 || thread > 0) 1767 goto out_close; 1768 1769 /* 1770 * Must probe features in the order they were added to the 1771 * perf_event_attr interface. 1772 */ 1773 if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { 1774 perf_missing_features.aux_output = true; 1775 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); 1776 goto out_close; 1777 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { 1778 perf_missing_features.bpf = true; 1779 pr_debug2_peo("switching off bpf_event\n"); 1780 goto fallback_missing_features; 1781 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { 1782 perf_missing_features.ksymbol = true; 1783 pr_debug2_peo("switching off ksymbol\n"); 1784 goto fallback_missing_features; 1785 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { 1786 perf_missing_features.write_backward = true; 1787 pr_debug2_peo("switching off write_backward\n"); 1788 goto out_close; 1789 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { 1790 perf_missing_features.clockid_wrong = true; 1791 pr_debug2_peo("switching off clockid\n"); 1792 goto fallback_missing_features; 1793 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { 1794 perf_missing_features.clockid = true; 1795 pr_debug2_peo("switching off use_clockid\n"); 1796 goto fallback_missing_features; 1797 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { 1798 perf_missing_features.cloexec = true; 1799 pr_debug2_peo("switching off cloexec flag\n"); 1800 goto fallback_missing_features; 1801 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { 1802 perf_missing_features.mmap2 = true; 1803 pr_debug2_peo("switching off mmap2\n"); 1804 goto fallback_missing_features; 1805 } else if (!perf_missing_features.exclude_guest && 1806 (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) { 1807 perf_missing_features.exclude_guest = true; 1808 pr_debug2_peo("switching off exclude_guest, exclude_host\n"); 1809 goto fallback_missing_features; 1810 } else if (!perf_missing_features.sample_id_all) { 1811 perf_missing_features.sample_id_all = true; 1812 pr_debug2_peo("switching off sample_id_all\n"); 1813 goto retry_sample_id; 1814 } else if (!perf_missing_features.lbr_flags && 1815 (evsel->core.attr.branch_sample_type & 1816 (PERF_SAMPLE_BRANCH_NO_CYCLES | 1817 PERF_SAMPLE_BRANCH_NO_FLAGS))) { 1818 perf_missing_features.lbr_flags = true; 1819 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); 1820 goto fallback_missing_features; 1821 } else if (!perf_missing_features.group_read && 1822 evsel->core.attr.inherit && 1823 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && 1824 perf_evsel__is_group_leader(evsel)) { 1825 perf_missing_features.group_read = true; 1826 pr_debug2_peo("switching off group read\n"); 1827 goto fallback_missing_features; 1828 } 1829 out_close: 1830 if (err) 1831 threads->err_thread = thread; 1832 1833 old_errno = errno; 1834 do { 1835 while (--thread >= 0) { 1836 if (FD(evsel, cpu, thread) >= 0) 1837 close(FD(evsel, cpu, thread)); 1838 FD(evsel, cpu, thread) = -1; 1839 } 1840 thread = nthreads; 1841 } while (--cpu >= 0); 1842 errno = old_errno; 1843 return err; 1844 } 1845 1846 void evsel__close(struct evsel *evsel) 1847 { 1848 perf_evsel__close(&evsel->core); 1849 perf_evsel__free_id(&evsel->core); 1850 } 1851 1852 int perf_evsel__open_per_cpu(struct evsel *evsel, 1853 struct perf_cpu_map *cpus) 1854 { 1855 return evsel__open(evsel, cpus, NULL); 1856 } 1857 1858 int perf_evsel__open_per_thread(struct evsel *evsel, 1859 struct perf_thread_map *threads) 1860 { 1861 return evsel__open(evsel, NULL, threads); 1862 } 1863 1864 static int perf_evsel__parse_id_sample(const struct evsel *evsel, 1865 const union perf_event *event, 1866 struct perf_sample *sample) 1867 { 1868 u64 type = evsel->core.attr.sample_type; 1869 const __u64 *array = event->sample.array; 1870 bool swapped = evsel->needs_swap; 1871 union u64_swap u; 1872 1873 array += ((event->header.size - 1874 sizeof(event->header)) / sizeof(u64)) - 1; 1875 1876 if (type & PERF_SAMPLE_IDENTIFIER) { 1877 sample->id = *array; 1878 array--; 1879 } 1880 1881 if (type & PERF_SAMPLE_CPU) { 1882 u.val64 = *array; 1883 if (swapped) { 1884 /* undo swap of u64, then swap on individual u32s */ 1885 u.val64 = bswap_64(u.val64); 1886 u.val32[0] = bswap_32(u.val32[0]); 1887 } 1888 1889 sample->cpu = u.val32[0]; 1890 array--; 1891 } 1892 1893 if (type & PERF_SAMPLE_STREAM_ID) { 1894 sample->stream_id = *array; 1895 array--; 1896 } 1897 1898 if (type & PERF_SAMPLE_ID) { 1899 sample->id = *array; 1900 array--; 1901 } 1902 1903 if (type & PERF_SAMPLE_TIME) { 1904 sample->time = *array; 1905 array--; 1906 } 1907 1908 if (type & PERF_SAMPLE_TID) { 1909 u.val64 = *array; 1910 if (swapped) { 1911 /* undo swap of u64, then swap on individual u32s */ 1912 u.val64 = bswap_64(u.val64); 1913 u.val32[0] = bswap_32(u.val32[0]); 1914 u.val32[1] = bswap_32(u.val32[1]); 1915 } 1916 1917 sample->pid = u.val32[0]; 1918 sample->tid = u.val32[1]; 1919 array--; 1920 } 1921 1922 return 0; 1923 } 1924 1925 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 1926 u64 size) 1927 { 1928 return size > max_size || offset + size > endp; 1929 } 1930 1931 #define OVERFLOW_CHECK(offset, size, max_size) \ 1932 do { \ 1933 if (overflow(endp, (max_size), (offset), (size))) \ 1934 return -EFAULT; \ 1935 } while (0) 1936 1937 #define OVERFLOW_CHECK_u64(offset) \ 1938 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 1939 1940 static int 1941 perf_event__check_size(union perf_event *event, unsigned int sample_size) 1942 { 1943 /* 1944 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 1945 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 1946 * check the format does not go past the end of the event. 1947 */ 1948 if (sample_size + sizeof(event->header) > event->header.size) 1949 return -EFAULT; 1950 1951 return 0; 1952 } 1953 1954 int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event, 1955 struct perf_sample *data) 1956 { 1957 u64 type = evsel->core.attr.sample_type; 1958 bool swapped = evsel->needs_swap; 1959 const __u64 *array; 1960 u16 max_size = event->header.size; 1961 const void *endp = (void *)event + max_size; 1962 u64 sz; 1963 1964 /* 1965 * used for cross-endian analysis. See git commit 65014ab3 1966 * for why this goofiness is needed. 1967 */ 1968 union u64_swap u; 1969 1970 memset(data, 0, sizeof(*data)); 1971 data->cpu = data->pid = data->tid = -1; 1972 data->stream_id = data->id = data->time = -1ULL; 1973 data->period = evsel->core.attr.sample_period; 1974 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 1975 data->misc = event->header.misc; 1976 data->id = -1ULL; 1977 data->data_src = PERF_MEM_DATA_SRC_NONE; 1978 1979 if (event->header.type != PERF_RECORD_SAMPLE) { 1980 if (!evsel->core.attr.sample_id_all) 1981 return 0; 1982 return perf_evsel__parse_id_sample(evsel, event, data); 1983 } 1984 1985 array = event->sample.array; 1986 1987 if (perf_event__check_size(event, evsel->sample_size)) 1988 return -EFAULT; 1989 1990 if (type & PERF_SAMPLE_IDENTIFIER) { 1991 data->id = *array; 1992 array++; 1993 } 1994 1995 if (type & PERF_SAMPLE_IP) { 1996 data->ip = *array; 1997 array++; 1998 } 1999 2000 if (type & PERF_SAMPLE_TID) { 2001 u.val64 = *array; 2002 if (swapped) { 2003 /* undo swap of u64, then swap on individual u32s */ 2004 u.val64 = bswap_64(u.val64); 2005 u.val32[0] = bswap_32(u.val32[0]); 2006 u.val32[1] = bswap_32(u.val32[1]); 2007 } 2008 2009 data->pid = u.val32[0]; 2010 data->tid = u.val32[1]; 2011 array++; 2012 } 2013 2014 if (type & PERF_SAMPLE_TIME) { 2015 data->time = *array; 2016 array++; 2017 } 2018 2019 if (type & PERF_SAMPLE_ADDR) { 2020 data->addr = *array; 2021 array++; 2022 } 2023 2024 if (type & PERF_SAMPLE_ID) { 2025 data->id = *array; 2026 array++; 2027 } 2028 2029 if (type & PERF_SAMPLE_STREAM_ID) { 2030 data->stream_id = *array; 2031 array++; 2032 } 2033 2034 if (type & PERF_SAMPLE_CPU) { 2035 2036 u.val64 = *array; 2037 if (swapped) { 2038 /* undo swap of u64, then swap on individual u32s */ 2039 u.val64 = bswap_64(u.val64); 2040 u.val32[0] = bswap_32(u.val32[0]); 2041 } 2042 2043 data->cpu = u.val32[0]; 2044 array++; 2045 } 2046 2047 if (type & PERF_SAMPLE_PERIOD) { 2048 data->period = *array; 2049 array++; 2050 } 2051 2052 if (type & PERF_SAMPLE_READ) { 2053 u64 read_format = evsel->core.attr.read_format; 2054 2055 OVERFLOW_CHECK_u64(array); 2056 if (read_format & PERF_FORMAT_GROUP) 2057 data->read.group.nr = *array; 2058 else 2059 data->read.one.value = *array; 2060 2061 array++; 2062 2063 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 2064 OVERFLOW_CHECK_u64(array); 2065 data->read.time_enabled = *array; 2066 array++; 2067 } 2068 2069 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 2070 OVERFLOW_CHECK_u64(array); 2071 data->read.time_running = *array; 2072 array++; 2073 } 2074 2075 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 2076 if (read_format & PERF_FORMAT_GROUP) { 2077 const u64 max_group_nr = UINT64_MAX / 2078 sizeof(struct sample_read_value); 2079 2080 if (data->read.group.nr > max_group_nr) 2081 return -EFAULT; 2082 sz = data->read.group.nr * 2083 sizeof(struct sample_read_value); 2084 OVERFLOW_CHECK(array, sz, max_size); 2085 data->read.group.values = 2086 (struct sample_read_value *)array; 2087 array = (void *)array + sz; 2088 } else { 2089 OVERFLOW_CHECK_u64(array); 2090 data->read.one.id = *array; 2091 array++; 2092 } 2093 } 2094 2095 if (evsel__has_callchain(evsel)) { 2096 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 2097 2098 OVERFLOW_CHECK_u64(array); 2099 data->callchain = (struct ip_callchain *)array++; 2100 if (data->callchain->nr > max_callchain_nr) 2101 return -EFAULT; 2102 sz = data->callchain->nr * sizeof(u64); 2103 OVERFLOW_CHECK(array, sz, max_size); 2104 array = (void *)array + sz; 2105 } 2106 2107 if (type & PERF_SAMPLE_RAW) { 2108 OVERFLOW_CHECK_u64(array); 2109 u.val64 = *array; 2110 2111 /* 2112 * Undo swap of u64, then swap on individual u32s, 2113 * get the size of the raw area and undo all of the 2114 * swap. The pevent interface handles endianity by 2115 * itself. 2116 */ 2117 if (swapped) { 2118 u.val64 = bswap_64(u.val64); 2119 u.val32[0] = bswap_32(u.val32[0]); 2120 u.val32[1] = bswap_32(u.val32[1]); 2121 } 2122 data->raw_size = u.val32[0]; 2123 2124 /* 2125 * The raw data is aligned on 64bits including the 2126 * u32 size, so it's safe to use mem_bswap_64. 2127 */ 2128 if (swapped) 2129 mem_bswap_64((void *) array, data->raw_size); 2130 2131 array = (void *)array + sizeof(u32); 2132 2133 OVERFLOW_CHECK(array, data->raw_size, max_size); 2134 data->raw_data = (void *)array; 2135 array = (void *)array + data->raw_size; 2136 } 2137 2138 if (type & PERF_SAMPLE_BRANCH_STACK) { 2139 const u64 max_branch_nr = UINT64_MAX / 2140 sizeof(struct branch_entry); 2141 2142 OVERFLOW_CHECK_u64(array); 2143 data->branch_stack = (struct branch_stack *)array++; 2144 2145 if (data->branch_stack->nr > max_branch_nr) 2146 return -EFAULT; 2147 sz = data->branch_stack->nr * sizeof(struct branch_entry); 2148 OVERFLOW_CHECK(array, sz, max_size); 2149 array = (void *)array + sz; 2150 } 2151 2152 if (type & PERF_SAMPLE_REGS_USER) { 2153 OVERFLOW_CHECK_u64(array); 2154 data->user_regs.abi = *array; 2155 array++; 2156 2157 if (data->user_regs.abi) { 2158 u64 mask = evsel->core.attr.sample_regs_user; 2159 2160 sz = hweight64(mask) * sizeof(u64); 2161 OVERFLOW_CHECK(array, sz, max_size); 2162 data->user_regs.mask = mask; 2163 data->user_regs.regs = (u64 *)array; 2164 array = (void *)array + sz; 2165 } 2166 } 2167 2168 if (type & PERF_SAMPLE_STACK_USER) { 2169 OVERFLOW_CHECK_u64(array); 2170 sz = *array++; 2171 2172 data->user_stack.offset = ((char *)(array - 1) 2173 - (char *) event); 2174 2175 if (!sz) { 2176 data->user_stack.size = 0; 2177 } else { 2178 OVERFLOW_CHECK(array, sz, max_size); 2179 data->user_stack.data = (char *)array; 2180 array = (void *)array + sz; 2181 OVERFLOW_CHECK_u64(array); 2182 data->user_stack.size = *array++; 2183 if (WARN_ONCE(data->user_stack.size > sz, 2184 "user stack dump failure\n")) 2185 return -EFAULT; 2186 } 2187 } 2188 2189 if (type & PERF_SAMPLE_WEIGHT) { 2190 OVERFLOW_CHECK_u64(array); 2191 data->weight = *array; 2192 array++; 2193 } 2194 2195 if (type & PERF_SAMPLE_DATA_SRC) { 2196 OVERFLOW_CHECK_u64(array); 2197 data->data_src = *array; 2198 array++; 2199 } 2200 2201 if (type & PERF_SAMPLE_TRANSACTION) { 2202 OVERFLOW_CHECK_u64(array); 2203 data->transaction = *array; 2204 array++; 2205 } 2206 2207 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 2208 if (type & PERF_SAMPLE_REGS_INTR) { 2209 OVERFLOW_CHECK_u64(array); 2210 data->intr_regs.abi = *array; 2211 array++; 2212 2213 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 2214 u64 mask = evsel->core.attr.sample_regs_intr; 2215 2216 sz = hweight64(mask) * sizeof(u64); 2217 OVERFLOW_CHECK(array, sz, max_size); 2218 data->intr_regs.mask = mask; 2219 data->intr_regs.regs = (u64 *)array; 2220 array = (void *)array + sz; 2221 } 2222 } 2223 2224 data->phys_addr = 0; 2225 if (type & PERF_SAMPLE_PHYS_ADDR) { 2226 data->phys_addr = *array; 2227 array++; 2228 } 2229 2230 if (type & PERF_SAMPLE_AUX) { 2231 OVERFLOW_CHECK_u64(array); 2232 sz = *array++; 2233 2234 OVERFLOW_CHECK(array, sz, max_size); 2235 /* Undo swap of data */ 2236 if (swapped) 2237 mem_bswap_64((char *)array, sz); 2238 data->aux_sample.size = sz; 2239 data->aux_sample.data = (char *)array; 2240 array = (void *)array + sz; 2241 } 2242 2243 return 0; 2244 } 2245 2246 int perf_evsel__parse_sample_timestamp(struct evsel *evsel, 2247 union perf_event *event, 2248 u64 *timestamp) 2249 { 2250 u64 type = evsel->core.attr.sample_type; 2251 const __u64 *array; 2252 2253 if (!(type & PERF_SAMPLE_TIME)) 2254 return -1; 2255 2256 if (event->header.type != PERF_RECORD_SAMPLE) { 2257 struct perf_sample data = { 2258 .time = -1ULL, 2259 }; 2260 2261 if (!evsel->core.attr.sample_id_all) 2262 return -1; 2263 if (perf_evsel__parse_id_sample(evsel, event, &data)) 2264 return -1; 2265 2266 *timestamp = data.time; 2267 return 0; 2268 } 2269 2270 array = event->sample.array; 2271 2272 if (perf_event__check_size(event, evsel->sample_size)) 2273 return -EFAULT; 2274 2275 if (type & PERF_SAMPLE_IDENTIFIER) 2276 array++; 2277 2278 if (type & PERF_SAMPLE_IP) 2279 array++; 2280 2281 if (type & PERF_SAMPLE_TID) 2282 array++; 2283 2284 if (type & PERF_SAMPLE_TIME) 2285 *timestamp = *array; 2286 2287 return 0; 2288 } 2289 2290 struct tep_format_field *perf_evsel__field(struct evsel *evsel, const char *name) 2291 { 2292 return tep_find_field(evsel->tp_format, name); 2293 } 2294 2295 void *perf_evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, 2296 const char *name) 2297 { 2298 struct tep_format_field *field = perf_evsel__field(evsel, name); 2299 int offset; 2300 2301 if (!field) 2302 return NULL; 2303 2304 offset = field->offset; 2305 2306 if (field->flags & TEP_FIELD_IS_DYNAMIC) { 2307 offset = *(int *)(sample->raw_data + field->offset); 2308 offset &= 0xffff; 2309 } 2310 2311 return sample->raw_data + offset; 2312 } 2313 2314 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, 2315 bool needs_swap) 2316 { 2317 u64 value; 2318 void *ptr = sample->raw_data + field->offset; 2319 2320 switch (field->size) { 2321 case 1: 2322 return *(u8 *)ptr; 2323 case 2: 2324 value = *(u16 *)ptr; 2325 break; 2326 case 4: 2327 value = *(u32 *)ptr; 2328 break; 2329 case 8: 2330 memcpy(&value, ptr, sizeof(u64)); 2331 break; 2332 default: 2333 return 0; 2334 } 2335 2336 if (!needs_swap) 2337 return value; 2338 2339 switch (field->size) { 2340 case 2: 2341 return bswap_16(value); 2342 case 4: 2343 return bswap_32(value); 2344 case 8: 2345 return bswap_64(value); 2346 default: 2347 return 0; 2348 } 2349 2350 return 0; 2351 } 2352 2353 u64 perf_evsel__intval(struct evsel *evsel, struct perf_sample *sample, 2354 const char *name) 2355 { 2356 struct tep_format_field *field = perf_evsel__field(evsel, name); 2357 2358 if (!field) 2359 return 0; 2360 2361 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0; 2362 } 2363 2364 bool perf_evsel__fallback(struct evsel *evsel, int err, 2365 char *msg, size_t msgsize) 2366 { 2367 int paranoid; 2368 2369 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2370 evsel->core.attr.type == PERF_TYPE_HARDWARE && 2371 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2372 /* 2373 * If it's cycles then fall back to hrtimer based 2374 * cpu-clock-tick sw counter, which is always available even if 2375 * no PMU support. 2376 * 2377 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2378 * b0a873e). 2379 */ 2380 scnprintf(msg, msgsize, "%s", 2381 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2382 2383 evsel->core.attr.type = PERF_TYPE_SOFTWARE; 2384 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK; 2385 2386 zfree(&evsel->name); 2387 return true; 2388 } else if (err == EACCES && !evsel->core.attr.exclude_kernel && 2389 (paranoid = perf_event_paranoid()) > 1) { 2390 const char *name = perf_evsel__name(evsel); 2391 char *new_name; 2392 const char *sep = ":"; 2393 2394 /* Is there already the separator in the name. */ 2395 if (strchr(name, '/') || 2396 strchr(name, ':')) 2397 sep = ""; 2398 2399 if (asprintf(&new_name, "%s%su", name, sep) < 0) 2400 return false; 2401 2402 if (evsel->name) 2403 free(evsel->name); 2404 evsel->name = new_name; 2405 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying " 2406 "to fall back to excluding kernel and hypervisor " 2407 " samples", paranoid); 2408 evsel->core.attr.exclude_kernel = 1; 2409 evsel->core.attr.exclude_hv = 1; 2410 2411 return true; 2412 } 2413 2414 return false; 2415 } 2416 2417 static bool find_process(const char *name) 2418 { 2419 size_t len = strlen(name); 2420 DIR *dir; 2421 struct dirent *d; 2422 int ret = -1; 2423 2424 dir = opendir(procfs__mountpoint()); 2425 if (!dir) 2426 return false; 2427 2428 /* Walk through the directory. */ 2429 while (ret && (d = readdir(dir)) != NULL) { 2430 char path[PATH_MAX]; 2431 char *data; 2432 size_t size; 2433 2434 if ((d->d_type != DT_DIR) || 2435 !strcmp(".", d->d_name) || 2436 !strcmp("..", d->d_name)) 2437 continue; 2438 2439 scnprintf(path, sizeof(path), "%s/%s/comm", 2440 procfs__mountpoint(), d->d_name); 2441 2442 if (filename__read_str(path, &data, &size)) 2443 continue; 2444 2445 ret = strncmp(name, data, len); 2446 free(data); 2447 } 2448 2449 closedir(dir); 2450 return ret ? false : true; 2451 } 2452 2453 int perf_evsel__open_strerror(struct evsel *evsel, struct target *target, 2454 int err, char *msg, size_t size) 2455 { 2456 char sbuf[STRERR_BUFSIZE]; 2457 int printed = 0; 2458 2459 switch (err) { 2460 case EPERM: 2461 case EACCES: 2462 if (err == EPERM) 2463 printed = scnprintf(msg, size, 2464 "No permission to enable %s event.\n\n", 2465 perf_evsel__name(evsel)); 2466 2467 return scnprintf(msg + printed, size - printed, 2468 "You may not have permission to collect %sstats.\n\n" 2469 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n" 2470 "which controls use of the performance events system by\n" 2471 "unprivileged users (without CAP_SYS_ADMIN).\n\n" 2472 "The current value is %d:\n\n" 2473 " -1: Allow use of (almost) all events by all users\n" 2474 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" 2475 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n" 2476 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n" 2477 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n" 2478 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n" 2479 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n" 2480 " kernel.perf_event_paranoid = -1\n" , 2481 target->system_wide ? "system-wide " : "", 2482 perf_event_paranoid()); 2483 case ENOENT: 2484 return scnprintf(msg, size, "The %s event is not supported.", 2485 perf_evsel__name(evsel)); 2486 case EMFILE: 2487 return scnprintf(msg, size, "%s", 2488 "Too many events are opened.\n" 2489 "Probably the maximum number of open file descriptors has been reached.\n" 2490 "Hint: Try again after reducing the number of events.\n" 2491 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 2492 case ENOMEM: 2493 if (evsel__has_callchain(evsel) && 2494 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0) 2495 return scnprintf(msg, size, 2496 "Not enough memory to setup event with callchain.\n" 2497 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n" 2498 "Hint: Current value: %d", sysctl__max_stack()); 2499 break; 2500 case ENODEV: 2501 if (target->cpu_list) 2502 return scnprintf(msg, size, "%s", 2503 "No such device - did you specify an out-of-range profile CPU?"); 2504 break; 2505 case EOPNOTSUPP: 2506 if (evsel->core.attr.sample_period != 0) 2507 return scnprintf(msg, size, 2508 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'", 2509 perf_evsel__name(evsel)); 2510 if (evsel->core.attr.precise_ip) 2511 return scnprintf(msg, size, "%s", 2512 "\'precise\' request may not be supported. Try removing 'p' modifier."); 2513 #if defined(__i386__) || defined(__x86_64__) 2514 if (evsel->core.attr.type == PERF_TYPE_HARDWARE) 2515 return scnprintf(msg, size, "%s", 2516 "No hardware sampling interrupt available.\n"); 2517 #endif 2518 break; 2519 case EBUSY: 2520 if (find_process("oprofiled")) 2521 return scnprintf(msg, size, 2522 "The PMU counters are busy/taken by another profiler.\n" 2523 "We found oprofile daemon running, please stop it and try again."); 2524 break; 2525 case EINVAL: 2526 if (evsel->core.attr.write_backward && perf_missing_features.write_backward) 2527 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); 2528 if (perf_missing_features.clockid) 2529 return scnprintf(msg, size, "clockid feature not supported."); 2530 if (perf_missing_features.clockid_wrong) 2531 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 2532 if (perf_missing_features.aux_output) 2533 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel."); 2534 break; 2535 default: 2536 break; 2537 } 2538 2539 return scnprintf(msg, size, 2540 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 2541 "/bin/dmesg | grep -i perf may provide additional information.\n", 2542 err, str_error_r(err, sbuf, sizeof(sbuf)), 2543 perf_evsel__name(evsel)); 2544 } 2545 2546 struct perf_env *perf_evsel__env(struct evsel *evsel) 2547 { 2548 if (evsel && evsel->evlist) 2549 return evsel->evlist->env; 2550 return &perf_env; 2551 } 2552 2553 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist) 2554 { 2555 int cpu, thread; 2556 2557 for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) { 2558 for (thread = 0; thread < xyarray__max_y(evsel->core.fd); 2559 thread++) { 2560 int fd = FD(evsel, cpu, thread); 2561 2562 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, 2563 cpu, thread, fd) < 0) 2564 return -1; 2565 } 2566 } 2567 2568 return 0; 2569 } 2570 2571 int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist) 2572 { 2573 struct perf_cpu_map *cpus = evsel->core.cpus; 2574 struct perf_thread_map *threads = evsel->core.threads; 2575 2576 if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr)) 2577 return -ENOMEM; 2578 2579 return store_evsel_ids(evsel, evlist); 2580 } 2581