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