tools/perf/util/evsel.c

   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                                                         PERF_SAMPLE_BRANCH_HW_INDEX;
 717                         }
 718                 } else
 719                          pr_warning("Cannot use LBR callstack with branch stack. "
 720                                     "Falling back to framepointers.\n");
 721         }
 722
 723         if (param->record_mode == CALLCHAIN_DWARF) {
 724                 if (!function) {
 725                         perf_evsel__set_sample_bit(evsel, REGS_USER);
 726                         perf_evsel__set_sample_bit(evsel, STACK_USER);
 727                         if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
 728                                 attr->sample_regs_user |= DWARF_MINIMAL_REGS;
 729                                 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
 730                                            "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
 731                                            "so the minimal registers set (IP, SP) is explicitly forced.\n");
 732                         } else {
 733                                 attr->sample_regs_user |= PERF_REGS_MASK;
 734                         }
 735                         attr->sample_stack_user = param->dump_size;
 736                         attr->exclude_callchain_user = 1;
 737                 } else {
 738                         pr_info("Cannot use DWARF unwind for function trace event,"
 739                                 " falling back to framepointers.\n");
 740                 }
 741         }
 742
 743         if (function) {
 744                 pr_info("Disabling user space callchains for function trace event.\n");
 745                 attr->exclude_callchain_user = 1;
 746         }
 747 }
 748
 749 void perf_evsel__config_callchain(struct evsel *evsel,
 750                                   struct record_opts *opts,
 751                                   struct callchain_param *param)
 752 {
 753         if (param->enabled)
 754                 return __perf_evsel__config_callchain(evsel, opts, param);
 755 }
 756
 757 static void
 758 perf_evsel__reset_callgraph(struct evsel *evsel,
 759                             struct callchain_param *param)
 760 {
 761         struct perf_event_attr *attr = &evsel->core.attr;
 762
 763         perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
 764         if (param->record_mode == CALLCHAIN_LBR) {
 765                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 766                 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
 767                                               PERF_SAMPLE_BRANCH_CALL_STACK |
 768                                               PERF_SAMPLE_BRANCH_HW_INDEX);
 769         }
 770         if (param->record_mode == CALLCHAIN_DWARF) {
 771                 perf_evsel__reset_sample_bit(evsel, REGS_USER);
 772                 perf_evsel__reset_sample_bit(evsel, STACK_USER);
 773         }
 774 }
 775
 776 static void apply_config_terms(struct evsel *evsel,
 777                                struct record_opts *opts, bool track)
 778 {
 779         struct perf_evsel_config_term *term;
 780         struct list_head *config_terms = &evsel->config_terms;
 781         struct perf_event_attr *attr = &evsel->core.attr;
 782         /* callgraph default */
 783         struct callchain_param param = {
 784                 .record_mode = callchain_param.record_mode,
 785         };
 786         u32 dump_size = 0;
 787         int max_stack = 0;
 788         const char *callgraph_buf = NULL;
 789
 790         list_for_each_entry(term, config_terms, list) {
 791                 switch (term->type) {
 792                 case PERF_EVSEL__CONFIG_TERM_PERIOD:
 793                         if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
 794                                 attr->sample_period = term->val.period;
 795                                 attr->freq = 0;
 796                                 perf_evsel__reset_sample_bit(evsel, PERIOD);
 797                         }
 798                         break;
 799                 case PERF_EVSEL__CONFIG_TERM_FREQ:
 800                         if (!(term->weak && opts->user_freq != UINT_MAX)) {
 801                                 attr->sample_freq = term->val.freq;
 802                                 attr->freq = 1;
 803                                 perf_evsel__set_sample_bit(evsel, PERIOD);
 804                         }
 805                         break;
 806                 case PERF_EVSEL__CONFIG_TERM_TIME:
 807                         if (term->val.time)
 808                                 perf_evsel__set_sample_bit(evsel, TIME);
 809                         else
 810                                 perf_evsel__reset_sample_bit(evsel, TIME);
 811                         break;
 812                 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
 813                         callgraph_buf = term->val.str;
 814                         break;
 815                 case PERF_EVSEL__CONFIG_TERM_BRANCH:
 816                         if (term->val.str && strcmp(term->val.str, "no")) {
 817                                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 818                                 parse_branch_str(term->val.str,
 819                                                  &attr->branch_sample_type);
 820                         } else
 821                                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 822                         break;
 823                 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
 824                         dump_size = term->val.stack_user;
 825                         break;
 826                 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
 827                         max_stack = term->val.max_stack;
 828                         break;
 829                 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
 830                         evsel->max_events = term->val.max_events;
 831                         break;
 832                 case PERF_EVSEL__CONFIG_TERM_INHERIT:
 833                         /*
 834                          * attr->inherit should has already been set by
 835                          * perf_evsel__config. If user explicitly set
 836                          * inherit using config terms, override global
 837                          * opt->no_inherit setting.
 838                          */
 839                         attr->inherit = term->val.inherit ? 1 : 0;
 840                         break;
 841                 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
 842                         attr->write_backward = term->val.overwrite ? 1 : 0;
 843                         break;
 844                 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
 845                         break;
 846                 case PERF_EVSEL__CONFIG_TERM_PERCORE:
 847                         break;
 848                 case PERF_EVSEL__CONFIG_TERM_AUX_OUTPUT:
 849                         attr->aux_output = term->val.aux_output ? 1 : 0;
 850                         break;
 851                 case PERF_EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
 852                         /* Already applied by auxtrace */
 853                         break;
 854                 case PERF_EVSEL__CONFIG_TERM_CFG_CHG:
 855                         break;
 856                 default:
 857                         break;
 858                 }
 859         }
 860
 861         /* User explicitly set per-event callgraph, clear the old setting and reset. */
 862         if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
 863                 bool sample_address = false;
 864
 865                 if (max_stack) {
 866                         param.max_stack = max_stack;
 867                         if (callgraph_buf == NULL)
 868                                 callgraph_buf = "fp";
 869                 }
 870
 871                 /* parse callgraph parameters */
 872                 if (callgraph_buf != NULL) {
 873                         if (!strcmp(callgraph_buf, "no")) {
 874                                 param.enabled = false;
 875                                 param.record_mode = CALLCHAIN_NONE;
 876                         } else {
 877                                 param.enabled = true;
 878                                 if (parse_callchain_record(callgraph_buf, &param)) {
 879                                         pr_err("per-event callgraph setting for %s failed. "
 880                                                "Apply callgraph global setting for it\n",
 881                                                evsel->name);
 882                                         return;
 883                                 }
 884                                 if (param.record_mode == CALLCHAIN_DWARF)
 885                                         sample_address = true;
 886                         }
 887                 }
 888                 if (dump_size > 0) {
 889                         dump_size = round_up(dump_size, sizeof(u64));
 890                         param.dump_size = dump_size;
 891                 }
 892
 893                 /* If global callgraph set, clear it */
 894                 if (callchain_param.enabled)
 895                         perf_evsel__reset_callgraph(evsel, &callchain_param);
 896
 897                 /* set perf-event callgraph */
 898                 if (param.enabled) {
 899                         if (sample_address) {
 900                                 perf_evsel__set_sample_bit(evsel, ADDR);
 901                                 perf_evsel__set_sample_bit(evsel, DATA_SRC);
 902                                 evsel->core.attr.mmap_data = track;
 903                         }
 904                         perf_evsel__config_callchain(evsel, opts, &param);
 905                 }
 906         }
 907 }
 908
 909 static bool is_dummy_event(struct evsel *evsel)
 910 {
 911         return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) &&
 912                (evsel->core.attr.config == PERF_COUNT_SW_DUMMY);
 913 }
 914
 915 struct perf_evsel_config_term *__perf_evsel__get_config_term(struct evsel *evsel,
 916                                                              enum evsel_term_type type)
 917 {
 918         struct perf_evsel_config_term *term, *found_term = NULL;
 919
 920         list_for_each_entry(term, &evsel->config_terms, list) {
 921                 if (term->type == type)
 922                         found_term = term;
 923         }
 924
 925         return found_term;
 926 }
 927
 928 /*
 929  * The enable_on_exec/disabled value strategy:
 930  *
 931  *  1) For any type of traced program:
 932  *    - all independent events and group leaders are disabled
 933  *    - all group members are enabled
 934  *
 935  *     Group members are ruled by group leaders. They need to
 936  *     be enabled, because the group scheduling relies on that.
 937  *
 938  *  2) For traced programs executed by perf:
 939  *     - all independent events and group leaders have
 940  *       enable_on_exec set
 941  *     - we don't specifically enable or disable any event during
 942  *       the record command
 943  *
 944  *     Independent events and group leaders are initially disabled
 945  *     and get enabled by exec. Group members are ruled by group
 946  *     leaders as stated in 1).
 947  *
 948  *  3) For traced programs attached by perf (pid/tid):
 949  *     - we specifically enable or disable all events during
 950  *       the record command
 951  *
 952  *     When attaching events to already running traced we
 953  *     enable/disable events specifically, as there's no
 954  *     initial traced exec call.
 955  */
 956 void perf_evsel__config(struct evsel *evsel, struct record_opts *opts,
 957                         struct callchain_param *callchain)
 958 {
 959         struct evsel *leader = evsel->leader;
 960         struct perf_event_attr *attr = &evsel->core.attr;
 961         int track = evsel->tracking;
 962         bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
 963
 964         attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
 965         attr->inherit       = !opts->no_inherit;
 966         attr->write_backward = opts->overwrite ? 1 : 0;
 967
 968         perf_evsel__set_sample_bit(evsel, IP);
 969         perf_evsel__set_sample_bit(evsel, TID);
 970
 971         if (evsel->sample_read) {
 972                 perf_evsel__set_sample_bit(evsel, READ);
 973
 974                 /*
 975                  * We need ID even in case of single event, because
 976                  * PERF_SAMPLE_READ process ID specific data.
 977                  */
 978                 perf_evsel__set_sample_id(evsel, false);
 979
 980                 /*
 981                  * Apply group format only if we belong to group
 982                  * with more than one members.
 983                  */
 984                 if (leader->core.nr_members > 1) {
 985                         attr->read_format |= PERF_FORMAT_GROUP;
 986                         attr->inherit = 0;
 987                 }
 988         }
 989
 990         /*
 991          * We default some events to have a default interval. But keep
 992          * it a weak assumption overridable by the user.
 993          */
 994         if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
 995                                      opts->user_interval != ULLONG_MAX)) {
 996                 if (opts->freq) {
 997                         perf_evsel__set_sample_bit(evsel, PERIOD);
 998                         attr->freq              = 1;
 999                         attr->sample_freq       = opts->freq;
1000                 } else {
1001                         attr->sample_period = opts->default_interval;
1002                 }
1003         }
1004
1005         /*
1006          * Disable sampling for all group members other
1007          * than leader in case leader 'leads' the sampling.
1008          */
1009         if ((leader != evsel) && leader->sample_read) {
1010                 attr->freq           = 0;
1011                 attr->sample_freq    = 0;
1012                 attr->sample_period  = 0;
1013                 attr->write_backward = 0;
1014
1015                 /*
1016                  * We don't get sample for slave events, we make them
1017                  * when delivering group leader sample. Set the slave
1018                  * event to follow the master sample_type to ease up
1019                  * report.
1020                  */
1021                 attr->sample_type = leader->core.attr.sample_type;
1022         }
1023
1024         if (opts->no_samples)
1025                 attr->sample_freq = 0;
1026
1027         if (opts->inherit_stat) {
1028                 evsel->core.attr.read_format |=
1029                         PERF_FORMAT_TOTAL_TIME_ENABLED |
1030                         PERF_FORMAT_TOTAL_TIME_RUNNING |
1031                         PERF_FORMAT_ID;
1032                 attr->inherit_stat = 1;
1033         }
1034
1035         if (opts->sample_address) {
1036                 perf_evsel__set_sample_bit(evsel, ADDR);
1037                 attr->mmap_data = track;
1038         }
1039
1040         /*
1041          * We don't allow user space callchains for  function trace
1042          * event, due to issues with page faults while tracing page
1043          * fault handler and its overall trickiness nature.
1044          */
1045         if (perf_evsel__is_function_event(evsel))
1046                 evsel->core.attr.exclude_callchain_user = 1;
1047
1048         if (callchain && callchain->enabled && !evsel->no_aux_samples)
1049                 perf_evsel__config_callchain(evsel, opts, callchain);
1050
1051         if (opts->sample_intr_regs) {
1052                 attr->sample_regs_intr = opts->sample_intr_regs;
1053                 perf_evsel__set_sample_bit(evsel, REGS_INTR);
1054         }
1055
1056         if (opts->sample_user_regs) {
1057                 attr->sample_regs_user |= opts->sample_user_regs;
1058                 perf_evsel__set_sample_bit(evsel, REGS_USER);
1059         }
1060
1061         if (target__has_cpu(&opts->target) || opts->sample_cpu)
1062                 perf_evsel__set_sample_bit(evsel, CPU);
1063
1064         /*
1065          * When the user explicitly disabled time don't force it here.
1066          */
1067         if (opts->sample_time &&
1068             (!perf_missing_features.sample_id_all &&
1069             (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1070              opts->sample_time_set)))
1071                 perf_evsel__set_sample_bit(evsel, TIME);
1072
1073         if (opts->raw_samples && !evsel->no_aux_samples) {
1074                 perf_evsel__set_sample_bit(evsel, TIME);
1075                 perf_evsel__set_sample_bit(evsel, RAW);
1076                 perf_evsel__set_sample_bit(evsel, CPU);
1077         }
1078
1079         if (opts->sample_address)
1080                 perf_evsel__set_sample_bit(evsel, DATA_SRC);
1081
1082         if (opts->sample_phys_addr)
1083                 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1084
1085         if (opts->no_buffering) {
1086                 attr->watermark = 0;
1087                 attr->wakeup_events = 1;
1088         }
1089         if (opts->branch_stack && !evsel->no_aux_samples) {
1090                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1091                 attr->branch_sample_type = opts->branch_stack;
1092         }
1093
1094         if (opts->sample_weight)
1095                 perf_evsel__set_sample_bit(evsel, WEIGHT);
1096
1097         attr->task  = track;
1098         attr->mmap  = track;
1099         attr->mmap2 = track && !perf_missing_features.mmap2;
1100         attr->comm  = track;
1101         attr->ksymbol = track && !perf_missing_features.ksymbol;
1102         attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1103
1104         if (opts->record_namespaces)
1105                 attr->namespaces  = track;
1106
1107         if (opts->record_cgroup) {
1108                 attr->cgroup = track && !perf_missing_features.cgroup;
1109                 perf_evsel__set_sample_bit(evsel, CGROUP);
1110         }
1111
1112         if (opts->record_switch_events)
1113                 attr->context_switch = track;
1114
1115         if (opts->sample_transaction)
1116                 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1117
1118         if (opts->running_time) {
1119                 evsel->core.attr.read_format |=
1120                         PERF_FORMAT_TOTAL_TIME_ENABLED |
1121                         PERF_FORMAT_TOTAL_TIME_RUNNING;
1122         }
1123
1124         /*
1125          * XXX see the function comment above
1126          *
1127          * Disabling only independent events or group leaders,
1128          * keeping group members enabled.
1129          */
1130         if (perf_evsel__is_group_leader(evsel))
1131                 attr->disabled = 1;
1132
1133         /*
1134          * Setting enable_on_exec for independent events and
1135          * group leaders for traced executed by perf.
1136          */
1137         if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1138                 !opts->initial_delay)
1139                 attr->enable_on_exec = 1;
1140
1141         if (evsel->immediate) {
1142                 attr->disabled = 0;
1143                 attr->enable_on_exec = 0;
1144         }
1145
1146         clockid = opts->clockid;
1147         if (opts->use_clockid) {
1148                 attr->use_clockid = 1;
1149                 attr->clockid = opts->clockid;
1150         }
1151
1152         if (evsel->precise_max)
1153                 attr->precise_ip = 3;
1154
1155         if (opts->all_user) {
1156                 attr->exclude_kernel = 1;
1157                 attr->exclude_user   = 0;
1158         }
1159
1160         if (opts->all_kernel) {
1161                 attr->exclude_kernel = 0;
1162                 attr->exclude_user   = 1;
1163         }
1164
1165         if (evsel->core.own_cpus || evsel->unit)
1166                 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1167
1168         /*
1169          * Apply event specific term settings,
1170          * it overloads any global configuration.
1171          */
1172         apply_config_terms(evsel, opts, track);
1173
1174         evsel->ignore_missing_thread = opts->ignore_missing_thread;
1175
1176         /* The --period option takes the precedence. */
1177         if (opts->period_set) {
1178                 if (opts->period)
1179                         perf_evsel__set_sample_bit(evsel, PERIOD);
1180                 else
1181                         perf_evsel__reset_sample_bit(evsel, PERIOD);
1182         }
1183
1184         /*
1185          * For initial_delay, a dummy event is added implicitly.
1186          * The software event will trigger -EOPNOTSUPP error out,
1187          * if BRANCH_STACK bit is set.
1188          */
1189         if (opts->initial_delay && is_dummy_event(evsel))
1190                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
1191 }
1192
1193 int perf_evsel__set_filter(struct evsel *evsel, const char *filter)
1194 {
1195         char *new_filter = strdup(filter);
1196
1197         if (new_filter != NULL) {
1198                 free(evsel->filter);
1199                 evsel->filter = new_filter;
1200                 return 0;
1201         }
1202
1203         return -1;
1204 }
1205
1206 static int perf_evsel__append_filter(struct evsel *evsel,
1207                                      const char *fmt, const char *filter)
1208 {
1209         char *new_filter;
1210
1211         if (evsel->filter == NULL)
1212                 return perf_evsel__set_filter(evsel, filter);
1213
1214         if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1215                 free(evsel->filter);
1216                 evsel->filter = new_filter;
1217                 return 0;
1218         }
1219
1220         return -1;
1221 }
1222
1223 int perf_evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1224 {
1225         return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1226 }
1227
1228 int perf_evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1229 {
1230         return perf_evsel__append_filter(evsel, "%s,%s", filter);
1231 }
1232
1233 /* Caller has to clear disabled after going through all CPUs. */
1234 int evsel__enable_cpu(struct evsel *evsel, int cpu)
1235 {
1236         return perf_evsel__enable_cpu(&evsel->core, cpu);
1237 }
1238
1239 int evsel__enable(struct evsel *evsel)
1240 {
1241         int err = perf_evsel__enable(&evsel->core);
1242
1243         if (!err)
1244                 evsel->disabled = false;
1245         return err;
1246 }
1247
1248 /* Caller has to set disabled after going through all CPUs. */
1249 int evsel__disable_cpu(struct evsel *evsel, int cpu)
1250 {
1251         return perf_evsel__disable_cpu(&evsel->core, cpu);
1252 }
1253
1254 int evsel__disable(struct evsel *evsel)
1255 {
1256         int err = perf_evsel__disable(&evsel->core);
1257         /*
1258          * We mark it disabled here so that tools that disable a event can
1259          * ignore events after they disable it. I.e. the ring buffer may have
1260          * already a few more events queued up before the kernel got the stop
1261          * request.
1262          */
1263         if (!err)
1264                 evsel->disabled = true;
1265
1266         return err;
1267 }
1268
1269 static void perf_evsel__free_config_terms(struct evsel *evsel)
1270 {
1271         struct perf_evsel_config_term *term, *h;
1272
1273         list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1274                 list_del_init(&term->list);
1275                 if (term->free_str)
1276                         zfree(&term->val.str);
1277                 free(term);
1278         }
1279 }
1280
1281 void perf_evsel__exit(struct evsel *evsel)
1282 {
1283         assert(list_empty(&evsel->core.node));
1284         assert(evsel->evlist == NULL);
1285         perf_evsel__free_counts(evsel);
1286         perf_evsel__free_fd(&evsel->core);
1287         perf_evsel__free_id(&evsel->core);
1288         perf_evsel__free_config_terms(evsel);
1289         cgroup__put(evsel->cgrp);
1290         perf_cpu_map__put(evsel->core.cpus);
1291         perf_cpu_map__put(evsel->core.own_cpus);
1292         perf_thread_map__put(evsel->core.threads);
1293         zfree(&evsel->group_name);
1294         zfree(&evsel->name);
1295         zfree(&evsel->pmu_name);
1296         perf_evsel__object.fini(evsel);
1297 }
1298
1299 void evsel__delete(struct evsel *evsel)
1300 {
1301         perf_evsel__exit(evsel);
1302         free(evsel);
1303 }
1304
1305 void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
1306                                 struct perf_counts_values *count)
1307 {
1308         struct perf_counts_values tmp;
1309
1310         if (!evsel->prev_raw_counts)
1311                 return;
1312
1313         if (cpu == -1) {
1314                 tmp = evsel->prev_raw_counts->aggr;
1315                 evsel->prev_raw_counts->aggr = *count;
1316         } else {
1317                 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1318                 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1319         }
1320
1321         count->val = count->val - tmp.val;
1322         count->ena = count->ena - tmp.ena;
1323         count->run = count->run - tmp.run;
1324 }
1325
1326 void perf_counts_values__scale(struct perf_counts_values *count,
1327                                bool scale, s8 *pscaled)
1328 {
1329         s8 scaled = 0;
1330
1331         if (scale) {
1332                 if (count->run == 0) {
1333                         scaled = -1;
1334                         count->val = 0;
1335                 } else if (count->run < count->ena) {
1336                         scaled = 1;
1337                         count->val = (u64)((double) count->val * count->ena / count->run);
1338                 }
1339         }
1340
1341         if (pscaled)
1342                 *pscaled = scaled;
1343 }
1344
1345 static int
1346 perf_evsel__read_one(struct evsel *evsel, int cpu, int thread)
1347 {
1348         struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1349
1350         return perf_evsel__read(&evsel->core, cpu, thread, count);
1351 }
1352
1353 static void
1354 perf_evsel__set_count(struct evsel *counter, int cpu, int thread,
1355                       u64 val, u64 ena, u64 run)
1356 {
1357         struct perf_counts_values *count;
1358
1359         count = perf_counts(counter->counts, cpu, thread);
1360
1361         count->val    = val;
1362         count->ena    = ena;
1363         count->run    = run;
1364
1365         perf_counts__set_loaded(counter->counts, cpu, thread, true);
1366 }
1367
1368 static int
1369 perf_evsel__process_group_data(struct evsel *leader,
1370                                int cpu, int thread, u64 *data)
1371 {
1372         u64 read_format = leader->core.attr.read_format;
1373         struct sample_read_value *v;
1374         u64 nr, ena = 0, run = 0, i;
1375
1376         nr = *data++;
1377
1378         if (nr != (u64) leader->core.nr_members)
1379                 return -EINVAL;
1380
1381         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1382                 ena = *data++;
1383
1384         if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1385                 run = *data++;
1386
1387         v = (struct sample_read_value *) data;
1388
1389         perf_evsel__set_count(leader, cpu, thread,
1390                               v[0].value, ena, run);
1391
1392         for (i = 1; i < nr; i++) {
1393                 struct evsel *counter;
1394
1395                 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1396                 if (!counter)
1397                         return -EINVAL;
1398
1399                 perf_evsel__set_count(counter, cpu, thread,
1400                                       v[i].value, ena, run);
1401         }
1402
1403         return 0;
1404 }
1405
1406 static int
1407 perf_evsel__read_group(struct evsel *leader, int cpu, int thread)
1408 {
1409         struct perf_stat_evsel *ps = leader->stats;
1410         u64 read_format = leader->core.attr.read_format;
1411         int size = perf_evsel__read_size(&leader->core);
1412         u64 *data = ps->group_data;
1413
1414         if (!(read_format & PERF_FORMAT_ID))
1415                 return -EINVAL;
1416
1417         if (!perf_evsel__is_group_leader(leader))
1418                 return -EINVAL;
1419
1420         if (!data) {
1421                 data = zalloc(size);
1422                 if (!data)
1423                         return -ENOMEM;
1424
1425                 ps->group_data = data;
1426         }
1427
1428         if (FD(leader, cpu, thread) < 0)
1429                 return -EINVAL;
1430
1431         if (readn(FD(leader, cpu, thread), data, size) <= 0)
1432                 return -errno;
1433
1434         return perf_evsel__process_group_data(leader, cpu, thread, data);
1435 }
1436
1437 int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread)
1438 {
1439         u64 read_format = evsel->core.attr.read_format;
1440
1441         if (read_format & PERF_FORMAT_GROUP)
1442                 return perf_evsel__read_group(evsel, cpu, thread);
1443         else
1444                 return perf_evsel__read_one(evsel, cpu, thread);
1445 }
1446
1447 int __perf_evsel__read_on_cpu(struct evsel *evsel,
1448                               int cpu, int thread, bool scale)
1449 {
1450         struct perf_counts_values count;
1451         size_t nv = scale ? 3 : 1;
1452
1453         if (FD(evsel, cpu, thread) < 0)
1454                 return -EINVAL;
1455
1456         if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1457                 return -ENOMEM;
1458
1459         if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1460                 return -errno;
1461
1462         perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1463         perf_counts_values__scale(&count, scale, NULL);
1464         *perf_counts(evsel->counts, cpu, thread) = count;
1465         return 0;
1466 }
1467
1468 static int get_group_fd(struct evsel *evsel, int cpu, int thread)
1469 {
1470         struct evsel *leader = evsel->leader;
1471         int fd;
1472
1473         if (perf_evsel__is_group_leader(evsel))
1474                 return -1;
1475
1476         /*
1477          * Leader must be already processed/open,
1478          * if not it's a bug.
1479          */
1480         BUG_ON(!leader->core.fd);
1481
1482         fd = FD(leader, cpu, thread);
1483         BUG_ON(fd == -1);
1484
1485         return fd;
1486 }
1487
1488 static void perf_evsel__remove_fd(struct evsel *pos,
1489                                   int nr_cpus, int nr_threads,
1490                                   int thread_idx)
1491 {
1492         for (int cpu = 0; cpu < nr_cpus; cpu++)
1493                 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1494                         FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1495 }
1496
1497 static int update_fds(struct evsel *evsel,
1498                       int nr_cpus, int cpu_idx,
1499                       int nr_threads, int thread_idx)
1500 {
1501         struct evsel *pos;
1502
1503         if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1504                 return -EINVAL;
1505
1506         evlist__for_each_entry(evsel->evlist, pos) {
1507                 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1508
1509                 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1510
1511                 /*
1512                  * Since fds for next evsel has not been created,
1513                  * there is no need to iterate whole event list.
1514                  */
1515                 if (pos == evsel)
1516                         break;
1517         }
1518         return 0;
1519 }
1520
1521 static bool ignore_missing_thread(struct evsel *evsel,
1522                                   int nr_cpus, int cpu,
1523                                   struct perf_thread_map *threads,
1524                                   int thread, int err)
1525 {
1526         pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1527
1528         if (!evsel->ignore_missing_thread)
1529                 return false;
1530
1531         /* The system wide setup does not work with threads. */
1532         if (evsel->core.system_wide)
1533                 return false;
1534
1535         /* The -ESRCH is perf event syscall errno for pid's not found. */
1536         if (err != -ESRCH)
1537                 return false;
1538
1539         /* If there's only one thread, let it fail. */
1540         if (threads->nr == 1)
1541                 return false;
1542
1543         /*
1544          * We should remove fd for missing_thread first
1545          * because thread_map__remove() will decrease threads->nr.
1546          */
1547         if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1548                 return false;
1549
1550         if (thread_map__remove(threads, thread))
1551                 return false;
1552
1553         pr_warning("WARNING: Ignored open failure for pid %d\n",
1554                    ignore_pid);
1555         return true;
1556 }
1557
1558 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1559                                 void *priv __maybe_unused)
1560 {
1561         return fprintf(fp, "  %-32s %s\n", name, val);
1562 }
1563
1564 static void display_attr(struct perf_event_attr *attr)
1565 {
1566         if (verbose >= 2 || debug_peo_args) {
1567                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1568                 fprintf(stderr, "perf_event_attr:\n");
1569                 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1570                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1571         }
1572 }
1573
1574 static int perf_event_open(struct evsel *evsel,
1575                            pid_t pid, int cpu, int group_fd,
1576                            unsigned long flags)
1577 {
1578         int precise_ip = evsel->core.attr.precise_ip;
1579         int fd;
1580
1581         while (1) {
1582                 pr_debug2_peo("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
1583                           pid, cpu, group_fd, flags);
1584
1585                 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags);
1586                 if (fd >= 0)
1587                         break;
1588
1589                 /* Do not try less precise if not requested. */
1590                 if (!evsel->precise_max)
1591                         break;
1592
1593                 /*
1594                  * We tried all the precise_ip values, and it's
1595                  * still failing, so leave it to standard fallback.
1596                  */
1597                 if (!evsel->core.attr.precise_ip) {
1598                         evsel->core.attr.precise_ip = precise_ip;
1599                         break;
1600                 }
1601
1602                 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
1603                 evsel->core.attr.precise_ip--;
1604                 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1605                 display_attr(&evsel->core.attr);
1606         }
1607
1608         return fd;
1609 }
1610
1611 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
1612                 struct perf_thread_map *threads,
1613                 int start_cpu, int end_cpu)
1614 {
1615         int cpu, thread, nthreads;
1616         unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1617         int pid = -1, err, old_errno;
1618         enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1619
1620         if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1621             (perf_missing_features.aux_output     && evsel->core.attr.aux_output))
1622                 return -EINVAL;
1623
1624         if (cpus == NULL) {
1625                 static struct perf_cpu_map *empty_cpu_map;
1626
1627                 if (empty_cpu_map == NULL) {
1628                         empty_cpu_map = perf_cpu_map__dummy_new();
1629                         if (empty_cpu_map == NULL)
1630                                 return -ENOMEM;
1631                 }
1632
1633                 cpus = empty_cpu_map;
1634         }
1635
1636         if (threads == NULL) {
1637                 static struct perf_thread_map *empty_thread_map;
1638
1639                 if (empty_thread_map == NULL) {
1640                         empty_thread_map = thread_map__new_by_tid(-1);
1641                         if (empty_thread_map == NULL)
1642                                 return -ENOMEM;
1643                 }
1644
1645                 threads = empty_thread_map;
1646         }
1647
1648         if (evsel->core.system_wide)
1649                 nthreads = 1;
1650         else
1651                 nthreads = threads->nr;
1652
1653         if (evsel->core.fd == NULL &&
1654             perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
1655                 return -ENOMEM;
1656
1657         if (evsel->cgrp) {
1658                 flags |= PERF_FLAG_PID_CGROUP;
1659                 pid = evsel->cgrp->fd;
1660         }
1661
1662 fallback_missing_features:
1663         if (perf_missing_features.clockid_wrong)
1664                 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1665         if (perf_missing_features.clockid) {
1666                 evsel->core.attr.use_clockid = 0;
1667                 evsel->core.attr.clockid = 0;
1668         }
1669         if (perf_missing_features.cloexec)
1670                 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1671         if (perf_missing_features.mmap2)
1672                 evsel->core.attr.mmap2 = 0;
1673         if (perf_missing_features.exclude_guest)
1674                 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1675         if (perf_missing_features.lbr_flags)
1676                 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1677                                      PERF_SAMPLE_BRANCH_NO_CYCLES);
1678         if (perf_missing_features.group_read && evsel->core.attr.inherit)
1679                 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1680         if (perf_missing_features.ksymbol)
1681                 evsel->core.attr.ksymbol = 0;
1682         if (perf_missing_features.bpf)
1683                 evsel->core.attr.bpf_event = 0;
1684         if (perf_missing_features.branch_hw_idx)
1685                 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
1686 retry_sample_id:
1687         if (perf_missing_features.sample_id_all)
1688                 evsel->core.attr.sample_id_all = 0;
1689
1690         display_attr(&evsel->core.attr);
1691
1692         for (cpu = start_cpu; cpu < end_cpu; cpu++) {
1693
1694                 for (thread = 0; thread < nthreads; thread++) {
1695                         int fd, group_fd;
1696
1697                         if (!evsel->cgrp && !evsel->core.system_wide)
1698                                 pid = perf_thread_map__pid(threads, thread);
1699
1700                         group_fd = get_group_fd(evsel, cpu, thread);
1701 retry_open:
1702                         test_attr__ready();
1703
1704                         fd = perf_event_open(evsel, pid, cpus->map[cpu],
1705                                              group_fd, flags);
1706
1707                         FD(evsel, cpu, thread) = fd;
1708
1709                         if (fd < 0) {
1710                                 err = -errno;
1711
1712                                 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1713                                         /*
1714                                          * We just removed 1 thread, so take a step
1715                                          * back on thread index and lower the upper
1716                                          * nthreads limit.
1717                                          */
1718                                         nthreads--;
1719                                         thread--;
1720
1721                                         /* ... and pretend like nothing have happened. */
1722                                         err = 0;
1723                                         continue;
1724                                 }
1725
1726                                 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
1727                                           err);
1728                                 goto try_fallback;
1729                         }
1730
1731                         pr_debug2_peo(" = %d\n", fd);
1732
1733                         if (evsel->bpf_fd >= 0) {
1734                                 int evt_fd = fd;
1735                                 int bpf_fd = evsel->bpf_fd;
1736
1737                                 err = ioctl(evt_fd,
1738                                             PERF_EVENT_IOC_SET_BPF,
1739                                             bpf_fd);
1740                                 if (err && errno != EEXIST) {
1741                                         pr_err("failed to attach bpf fd %d: %s\n",
1742                                                bpf_fd, strerror(errno));
1743                                         err = -EINVAL;
1744                                         goto out_close;
1745                                 }
1746                         }
1747
1748                         set_rlimit = NO_CHANGE;
1749
1750                         /*
1751                          * If we succeeded but had to kill clockid, fail and
1752                          * have perf_evsel__open_strerror() print us a nice
1753                          * error.
1754                          */
1755                         if (perf_missing_features.clockid ||
1756                             perf_missing_features.clockid_wrong) {
1757                                 err = -EINVAL;
1758                                 goto out_close;
1759                         }
1760                 }
1761         }
1762
1763         return 0;
1764
1765 try_fallback:
1766         /*
1767          * perf stat needs between 5 and 22 fds per CPU. When we run out
1768          * of them try to increase the limits.
1769          */
1770         if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1771                 struct rlimit l;
1772
1773                 old_errno = errno;
1774                 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1775                         if (set_rlimit == NO_CHANGE)
1776                                 l.rlim_cur = l.rlim_max;
1777                         else {
1778                                 l.rlim_cur = l.rlim_max + 1000;
1779                                 l.rlim_max = l.rlim_cur;
1780                         }
1781                         if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1782                                 set_rlimit++;
1783                                 errno = old_errno;
1784                                 goto retry_open;
1785                         }
1786                 }
1787                 errno = old_errno;
1788         }
1789
1790         if (err != -EINVAL || cpu > 0 || thread > 0)
1791                 goto out_close;
1792
1793         /*
1794          * Must probe features in the order they were added to the
1795          * perf_event_attr interface.
1796          */
1797         if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
1798                 perf_missing_features.cgroup = true;
1799                 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
1800                 goto out_close;
1801         } else if (!perf_missing_features.branch_hw_idx &&
1802             (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
1803                 perf_missing_features.branch_hw_idx = true;
1804                 pr_debug2("switching off branch HW index support\n");
1805                 goto fallback_missing_features;
1806         } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1807                 perf_missing_features.aux_output = true;
1808                 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
1809                 goto out_close;
1810         } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1811                 perf_missing_features.bpf = true;
1812                 pr_debug2_peo("switching off bpf_event\n");
1813                 goto fallback_missing_features;
1814         } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1815                 perf_missing_features.ksymbol = true;
1816                 pr_debug2_peo("switching off ksymbol\n");
1817                 goto fallback_missing_features;
1818         } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1819                 perf_missing_features.write_backward = true;
1820                 pr_debug2_peo("switching off write_backward\n");
1821                 goto out_close;
1822         } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1823                 perf_missing_features.clockid_wrong = true;
1824                 pr_debug2_peo("switching off clockid\n");
1825                 goto fallback_missing_features;
1826         } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1827                 perf_missing_features.clockid = true;
1828                 pr_debug2_peo("switching off use_clockid\n");
1829                 goto fallback_missing_features;
1830         } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1831                 perf_missing_features.cloexec = true;
1832                 pr_debug2_peo("switching off cloexec flag\n");
1833                 goto fallback_missing_features;
1834         } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1835                 perf_missing_features.mmap2 = true;
1836                 pr_debug2_peo("switching off mmap2\n");
1837                 goto fallback_missing_features;
1838         } else if (!perf_missing_features.exclude_guest &&
1839                    (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
1840                 perf_missing_features.exclude_guest = true;
1841                 pr_debug2_peo("switching off exclude_guest, exclude_host\n");
1842                 goto fallback_missing_features;
1843         } else if (!perf_missing_features.sample_id_all) {
1844                 perf_missing_features.sample_id_all = true;
1845                 pr_debug2_peo("switching off sample_id_all\n");
1846                 goto retry_sample_id;
1847         } else if (!perf_missing_features.lbr_flags &&
1848                         (evsel->core.attr.branch_sample_type &
1849                          (PERF_SAMPLE_BRANCH_NO_CYCLES |
1850                           PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1851                 perf_missing_features.lbr_flags = true;
1852                 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
1853                 goto fallback_missing_features;
1854         } else if (!perf_missing_features.group_read &&
1855                     evsel->core.attr.inherit &&
1856                    (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1857                    perf_evsel__is_group_leader(evsel)) {
1858                 perf_missing_features.group_read = true;
1859                 pr_debug2_peo("switching off group read\n");
1860                 goto fallback_missing_features;
1861         }
1862 out_close:
1863         if (err)
1864                 threads->err_thread = thread;
1865
1866         old_errno = errno;
1867         do {
1868                 while (--thread >= 0) {
1869                         if (FD(evsel, cpu, thread) >= 0)
1870                                 close(FD(evsel, cpu, thread));
1871                         FD(evsel, cpu, thread) = -1;
1872                 }
1873                 thread = nthreads;
1874         } while (--cpu >= 0);
1875         errno = old_errno;
1876         return err;
1877 }
1878
1879 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
1880                 struct perf_thread_map *threads)
1881 {
1882         return evsel__open_cpu(evsel, cpus, threads, 0, cpus ? cpus->nr : 1);
1883 }
1884
1885 void evsel__close(struct evsel *evsel)
1886 {
1887         perf_evsel__close(&evsel->core);
1888         perf_evsel__free_id(&evsel->core);
1889 }
1890
1891 int perf_evsel__open_per_cpu(struct evsel *evsel,
1892                              struct perf_cpu_map *cpus,
1893                              int cpu)
1894 {
1895         if (cpu == -1)
1896                 return evsel__open_cpu(evsel, cpus, NULL, 0,
1897                                         cpus ? cpus->nr : 1);
1898
1899         return evsel__open_cpu(evsel, cpus, NULL, cpu, cpu + 1);
1900 }
1901
1902 int perf_evsel__open_per_thread(struct evsel *evsel,
1903                                 struct perf_thread_map *threads)
1904 {
1905         return evsel__open(evsel, NULL, threads);
1906 }
1907
1908 static int perf_evsel__parse_id_sample(const struct evsel *evsel,
1909                                        const union perf_event *event,
1910                                        struct perf_sample *sample)
1911 {
1912         u64 type = evsel->core.attr.sample_type;
1913         const __u64 *array = event->sample.array;
1914         bool swapped = evsel->needs_swap;
1915         union u64_swap u;
1916
1917         array += ((event->header.size -
1918                    sizeof(event->header)) / sizeof(u64)) - 1;
1919
1920         if (type & PERF_SAMPLE_IDENTIFIER) {
1921                 sample->id = *array;
1922                 array--;
1923         }
1924
1925         if (type & PERF_SAMPLE_CPU) {
1926                 u.val64 = *array;
1927                 if (swapped) {
1928                         /* undo swap of u64, then swap on individual u32s */
1929                         u.val64 = bswap_64(u.val64);
1930                         u.val32[0] = bswap_32(u.val32[0]);
1931                 }
1932
1933                 sample->cpu = u.val32[0];
1934                 array--;
1935         }
1936
1937         if (type & PERF_SAMPLE_STREAM_ID) {
1938                 sample->stream_id = *array;
1939                 array--;
1940         }
1941
1942         if (type & PERF_SAMPLE_ID) {
1943                 sample->id = *array;
1944                 array--;
1945         }
1946
1947         if (type & PERF_SAMPLE_TIME) {
1948                 sample->time = *array;
1949                 array--;
1950         }
1951
1952         if (type & PERF_SAMPLE_TID) {
1953                 u.val64 = *array;
1954                 if (swapped) {
1955                         /* undo swap of u64, then swap on individual u32s */
1956                         u.val64 = bswap_64(u.val64);
1957                         u.val32[0] = bswap_32(u.val32[0]);
1958                         u.val32[1] = bswap_32(u.val32[1]);
1959                 }
1960
1961                 sample->pid = u.val32[0];
1962                 sample->tid = u.val32[1];
1963                 array--;
1964         }
1965
1966         return 0;
1967 }
1968
1969 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1970                             u64 size)
1971 {
1972         return size > max_size || offset + size > endp;
1973 }
1974
1975 #define OVERFLOW_CHECK(offset, size, max_size)                          \
1976         do {                                                            \
1977                 if (overflow(endp, (max_size), (offset), (size)))       \
1978                         return -EFAULT;                                 \
1979         } while (0)
1980
1981 #define OVERFLOW_CHECK_u64(offset) \
1982         OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1983
1984 static int
1985 perf_event__check_size(union perf_event *event, unsigned int sample_size)
1986 {
1987         /*
1988          * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1989          * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
1990          * check the format does not go past the end of the event.
1991          */
1992         if (sample_size + sizeof(event->header) > event->header.size)
1993                 return -EFAULT;
1994
1995         return 0;
1996 }
1997
1998 int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event,
1999                              struct perf_sample *data)
2000 {
2001         u64 type = evsel->core.attr.sample_type;
2002         bool swapped = evsel->needs_swap;
2003         const __u64 *array;
2004         u16 max_size = event->header.size;
2005         const void *endp = (void *)event + max_size;
2006         u64 sz;
2007
2008         /*
2009          * used for cross-endian analysis. See git commit 65014ab3
2010          * for why this goofiness is needed.
2011          */
2012         union u64_swap u;
2013
2014         memset(data, 0, sizeof(*data));
2015         data->cpu = data->pid = data->tid = -1;
2016         data->stream_id = data->id = data->time = -1ULL;
2017         data->period = evsel->core.attr.sample_period;
2018         data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2019         data->misc    = event->header.misc;
2020         data->id = -1ULL;
2021         data->data_src = PERF_MEM_DATA_SRC_NONE;
2022
2023         if (event->header.type != PERF_RECORD_SAMPLE) {
2024                 if (!evsel->core.attr.sample_id_all)
2025                         return 0;
2026                 return perf_evsel__parse_id_sample(evsel, event, data);
2027         }
2028
2029         array = event->sample.array;
2030
2031         if (perf_event__check_size(event, evsel->sample_size))
2032                 return -EFAULT;
2033
2034         if (type & PERF_SAMPLE_IDENTIFIER) {
2035                 data->id = *array;
2036                 array++;
2037         }
2038
2039         if (type & PERF_SAMPLE_IP) {
2040                 data->ip = *array;
2041                 array++;
2042         }
2043
2044         if (type & PERF_SAMPLE_TID) {
2045                 u.val64 = *array;
2046                 if (swapped) {
2047                         /* undo swap of u64, then swap on individual u32s */
2048                         u.val64 = bswap_64(u.val64);
2049                         u.val32[0] = bswap_32(u.val32[0]);
2050                         u.val32[1] = bswap_32(u.val32[1]);
2051                 }
2052
2053                 data->pid = u.val32[0];
2054                 data->tid = u.val32[1];
2055                 array++;
2056         }
2057
2058         if (type & PERF_SAMPLE_TIME) {
2059                 data->time = *array;
2060                 array++;
2061         }
2062
2063         if (type & PERF_SAMPLE_ADDR) {
2064                 data->addr = *array;
2065                 array++;
2066         }
2067
2068         if (type & PERF_SAMPLE_ID) {
2069                 data->id = *array;
2070                 array++;
2071         }
2072
2073         if (type & PERF_SAMPLE_STREAM_ID) {
2074                 data->stream_id = *array;
2075                 array++;
2076         }
2077
2078         if (type & PERF_SAMPLE_CPU) {
2079
2080                 u.val64 = *array;
2081                 if (swapped) {
2082                         /* undo swap of u64, then swap on individual u32s */
2083                         u.val64 = bswap_64(u.val64);
2084                         u.val32[0] = bswap_32(u.val32[0]);
2085                 }
2086
2087                 data->cpu = u.val32[0];
2088                 array++;
2089         }
2090
2091         if (type & PERF_SAMPLE_PERIOD) {
2092                 data->period = *array;
2093                 array++;
2094         }
2095
2096         if (type & PERF_SAMPLE_READ) {
2097                 u64 read_format = evsel->core.attr.read_format;
2098
2099                 OVERFLOW_CHECK_u64(array);
2100                 if (read_format & PERF_FORMAT_GROUP)
2101                         data->read.group.nr = *array;
2102                 else
2103                         data->read.one.value = *array;
2104
2105                 array++;
2106
2107                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2108                         OVERFLOW_CHECK_u64(array);
2109                         data->read.time_enabled = *array;
2110                         array++;
2111                 }
2112
2113                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2114                         OVERFLOW_CHECK_u64(array);
2115                         data->read.time_running = *array;
2116                         array++;
2117                 }
2118
2119                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2120                 if (read_format & PERF_FORMAT_GROUP) {
2121                         const u64 max_group_nr = UINT64_MAX /
2122                                         sizeof(struct sample_read_value);
2123
2124                         if (data->read.group.nr > max_group_nr)
2125                                 return -EFAULT;
2126                         sz = data->read.group.nr *
2127                              sizeof(struct sample_read_value);
2128                         OVERFLOW_CHECK(array, sz, max_size);
2129                         data->read.group.values =
2130                                         (struct sample_read_value *)array;
2131                         array = (void *)array + sz;
2132                 } else {
2133                         OVERFLOW_CHECK_u64(array);
2134                         data->read.one.id = *array;
2135                         array++;
2136                 }
2137         }
2138
2139         if (evsel__has_callchain(evsel)) {
2140                 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2141
2142                 OVERFLOW_CHECK_u64(array);
2143                 data->callchain = (struct ip_callchain *)array++;
2144                 if (data->callchain->nr > max_callchain_nr)
2145                         return -EFAULT;
2146                 sz = data->callchain->nr * sizeof(u64);
2147                 OVERFLOW_CHECK(array, sz, max_size);
2148                 array = (void *)array + sz;
2149         }
2150
2151         if (type & PERF_SAMPLE_RAW) {
2152                 OVERFLOW_CHECK_u64(array);
2153                 u.val64 = *array;
2154
2155                 /*
2156                  * Undo swap of u64, then swap on individual u32s,
2157                  * get the size of the raw area and undo all of the
2158                  * swap. The pevent interface handles endianity by
2159                  * itself.
2160                  */
2161                 if (swapped) {
2162                         u.val64 = bswap_64(u.val64);
2163                         u.val32[0] = bswap_32(u.val32[0]);
2164                         u.val32[1] = bswap_32(u.val32[1]);
2165                 }
2166                 data->raw_size = u.val32[0];
2167
2168                 /*
2169                  * The raw data is aligned on 64bits including the
2170                  * u32 size, so it's safe to use mem_bswap_64.
2171                  */
2172                 if (swapped)
2173                         mem_bswap_64((void *) array, data->raw_size);
2174
2175                 array = (void *)array + sizeof(u32);
2176
2177                 OVERFLOW_CHECK(array, data->raw_size, max_size);
2178                 data->raw_data = (void *)array;
2179                 array = (void *)array + data->raw_size;
2180         }
2181
2182         if (type & PERF_SAMPLE_BRANCH_STACK) {
2183                 const u64 max_branch_nr = UINT64_MAX /
2184                                           sizeof(struct branch_entry);
2185
2186                 OVERFLOW_CHECK_u64(array);
2187                 data->branch_stack = (struct branch_stack *)array++;
2188
2189                 if (data->branch_stack->nr > max_branch_nr)
2190                         return -EFAULT;
2191
2192                 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2193                 if (perf_evsel__has_branch_hw_idx(evsel))
2194                         sz += sizeof(u64);
2195                 else
2196                         data->no_hw_idx = true;
2197                 OVERFLOW_CHECK(array, sz, max_size);
2198                 array = (void *)array + sz;
2199         }
2200
2201         if (type & PERF_SAMPLE_REGS_USER) {
2202                 OVERFLOW_CHECK_u64(array);
2203                 data->user_regs.abi = *array;
2204                 array++;
2205
2206                 if (data->user_regs.abi) {
2207                         u64 mask = evsel->core.attr.sample_regs_user;
2208
2209                         sz = hweight64(mask) * sizeof(u64);
2210                         OVERFLOW_CHECK(array, sz, max_size);
2211                         data->user_regs.mask = mask;
2212                         data->user_regs.regs = (u64 *)array;
2213                         array = (void *)array + sz;
2214                 }
2215         }
2216
2217         if (type & PERF_SAMPLE_STACK_USER) {
2218                 OVERFLOW_CHECK_u64(array);
2219                 sz = *array++;
2220
2221                 data->user_stack.offset = ((char *)(array - 1)
2222                                           - (char *) event);
2223
2224                 if (!sz) {
2225                         data->user_stack.size = 0;
2226                 } else {
2227                         OVERFLOW_CHECK(array, sz, max_size);
2228                         data->user_stack.data = (char *)array;
2229                         array = (void *)array + sz;
2230                         OVERFLOW_CHECK_u64(array);
2231                         data->user_stack.size = *array++;
2232                         if (WARN_ONCE(data->user_stack.size > sz,
2233                                       "user stack dump failure\n"))
2234                                 return -EFAULT;
2235                 }
2236         }
2237
2238         if (type & PERF_SAMPLE_WEIGHT) {
2239                 OVERFLOW_CHECK_u64(array);
2240                 data->weight = *array;
2241                 array++;
2242         }
2243
2244         if (type & PERF_SAMPLE_DATA_SRC) {
2245                 OVERFLOW_CHECK_u64(array);
2246                 data->data_src = *array;
2247                 array++;
2248         }
2249
2250         if (type & PERF_SAMPLE_TRANSACTION) {
2251                 OVERFLOW_CHECK_u64(array);
2252                 data->transaction = *array;
2253                 array++;
2254         }
2255
2256         data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2257         if (type & PERF_SAMPLE_REGS_INTR) {
2258                 OVERFLOW_CHECK_u64(array);
2259                 data->intr_regs.abi = *array;
2260                 array++;
2261
2262                 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2263                         u64 mask = evsel->core.attr.sample_regs_intr;
2264
2265                         sz = hweight64(mask) * sizeof(u64);
2266                         OVERFLOW_CHECK(array, sz, max_size);
2267                         data->intr_regs.mask = mask;
2268                         data->intr_regs.regs = (u64 *)array;
2269                         array = (void *)array + sz;
2270                 }
2271         }
2272
2273         data->phys_addr = 0;
2274         if (type & PERF_SAMPLE_PHYS_ADDR) {
2275                 data->phys_addr = *array;
2276                 array++;
2277         }
2278
2279         data->cgroup = 0;
2280         if (type & PERF_SAMPLE_CGROUP) {
2281                 data->cgroup = *array;
2282                 array++;
2283         }
2284
2285         if (type & PERF_SAMPLE_AUX) {
2286                 OVERFLOW_CHECK_u64(array);
2287                 sz = *array++;
2288
2289                 OVERFLOW_CHECK(array, sz, max_size);
2290                 /* Undo swap of data */
2291                 if (swapped)
2292                         mem_bswap_64((char *)array, sz);
2293                 data->aux_sample.size = sz;
2294                 data->aux_sample.data = (char *)array;
2295                 array = (void *)array + sz;
2296         }
2297
2298         return 0;
2299 }
2300
2301 int perf_evsel__parse_sample_timestamp(struct evsel *evsel,
2302                                        union perf_event *event,
2303                                        u64 *timestamp)
2304 {
2305         u64 type = evsel->core.attr.sample_type;
2306         const __u64 *array;
2307
2308         if (!(type & PERF_SAMPLE_TIME))
2309                 return -1;
2310
2311         if (event->header.type != PERF_RECORD_SAMPLE) {
2312                 struct perf_sample data = {
2313                         .time = -1ULL,
2314                 };
2315
2316                 if (!evsel->core.attr.sample_id_all)
2317                         return -1;
2318                 if (perf_evsel__parse_id_sample(evsel, event, &data))
2319                         return -1;
2320
2321                 *timestamp = data.time;
2322                 return 0;
2323         }
2324
2325         array = event->sample.array;
2326
2327         if (perf_event__check_size(event, evsel->sample_size))
2328                 return -EFAULT;
2329
2330         if (type & PERF_SAMPLE_IDENTIFIER)
2331                 array++;
2332
2333         if (type & PERF_SAMPLE_IP)
2334                 array++;
2335
2336         if (type & PERF_SAMPLE_TID)
2337                 array++;
2338
2339         if (type & PERF_SAMPLE_TIME)
2340                 *timestamp = *array;
2341
2342         return 0;
2343 }
2344
2345 struct tep_format_field *perf_evsel__field(struct evsel *evsel, const char *name)
2346 {
2347         return tep_find_field(evsel->tp_format, name);
2348 }
2349
2350 void *perf_evsel__rawptr(struct evsel *evsel, struct perf_sample *sample,
2351                          const char *name)
2352 {
2353         struct tep_format_field *field = perf_evsel__field(evsel, name);
2354         int offset;
2355
2356         if (!field)
2357                 return NULL;
2358
2359         offset = field->offset;
2360
2361         if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2362                 offset = *(int *)(sample->raw_data + field->offset);
2363                 offset &= 0xffff;
2364         }
2365
2366         return sample->raw_data + offset;
2367 }
2368
2369 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2370                          bool needs_swap)
2371 {
2372         u64 value;
2373         void *ptr = sample->raw_data + field->offset;
2374
2375         switch (field->size) {
2376         case 1:
2377                 return *(u8 *)ptr;
2378         case 2:
2379                 value = *(u16 *)ptr;
2380                 break;
2381         case 4:
2382                 value = *(u32 *)ptr;
2383                 break;
2384         case 8:
2385                 memcpy(&value, ptr, sizeof(u64));
2386                 break;
2387         default:
2388                 return 0;
2389         }
2390
2391         if (!needs_swap)
2392                 return value;
2393
2394         switch (field->size) {
2395         case 2:
2396                 return bswap_16(value);
2397         case 4:
2398                 return bswap_32(value);
2399         case 8:
2400                 return bswap_64(value);
2401         default:
2402                 return 0;
2403         }
2404
2405         return 0;
2406 }
2407
2408 u64 perf_evsel__intval(struct evsel *evsel, struct perf_sample *sample,
2409                        const char *name)
2410 {
2411         struct tep_format_field *field = perf_evsel__field(evsel, name);
2412
2413         if (!field)
2414                 return 0;
2415
2416         return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2417 }
2418
2419 bool perf_evsel__fallback(struct evsel *evsel, int err,
2420                           char *msg, size_t msgsize)
2421 {
2422         int paranoid;
2423
2424         if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2425             evsel->core.attr.type   == PERF_TYPE_HARDWARE &&
2426             evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2427                 /*
2428                  * If it's cycles then fall back to hrtimer based
2429                  * cpu-clock-tick sw counter, which is always available even if
2430                  * no PMU support.
2431                  *
2432                  * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2433                  * b0a873e).
2434                  */
2435                 scnprintf(msg, msgsize, "%s",
2436 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2437
2438                 evsel->core.attr.type   = PERF_TYPE_SOFTWARE;
2439                 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
2440
2441                 zfree(&evsel->name);
2442                 return true;
2443         } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2444                    (paranoid = perf_event_paranoid()) > 1) {
2445                 const char *name = perf_evsel__name(evsel);
2446                 char *new_name;
2447                 const char *sep = ":";
2448
2449                 /* Is there already the separator in the name. */
2450                 if (strchr(name, '/') ||
2451                     strchr(name, ':'))
2452                         sep = "";
2453
2454                 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2455                         return false;
2456
2457                 if (evsel->name)
2458                         free(evsel->name);
2459                 evsel->name = new_name;
2460                 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2461                           "to fall back to excluding kernel and hypervisor "
2462                           " samples", paranoid);
2463                 evsel->core.attr.exclude_kernel = 1;
2464                 evsel->core.attr.exclude_hv     = 1;
2465
2466                 return true;
2467         }
2468
2469         return false;
2470 }
2471
2472 static bool find_process(const char *name)
2473 {
2474         size_t len = strlen(name);
2475         DIR *dir;
2476         struct dirent *d;
2477         int ret = -1;
2478
2479         dir = opendir(procfs__mountpoint());
2480         if (!dir)
2481                 return false;
2482
2483         /* Walk through the directory. */
2484         while (ret && (d = readdir(dir)) != NULL) {
2485                 char path[PATH_MAX];
2486                 char *data;
2487                 size_t size;
2488
2489                 if ((d->d_type != DT_DIR) ||
2490                      !strcmp(".", d->d_name) ||
2491                      !strcmp("..", d->d_name))
2492                         continue;
2493
2494                 scnprintf(path, sizeof(path), "%s/%s/comm",
2495                           procfs__mountpoint(), d->d_name);
2496
2497                 if (filename__read_str(path, &data, &size))
2498                         continue;
2499
2500                 ret = strncmp(name, data, len);
2501                 free(data);
2502         }
2503
2504         closedir(dir);
2505         return ret ? false : true;
2506 }
2507
2508 int perf_evsel__open_strerror(struct evsel *evsel, struct target *target,
2509                               int err, char *msg, size_t size)
2510 {
2511         char sbuf[STRERR_BUFSIZE];
2512         int printed = 0;
2513
2514         switch (err) {
2515         case EPERM:
2516         case EACCES:
2517                 if (err == EPERM)
2518                         printed = scnprintf(msg, size,
2519                                 "No permission to enable %s event.\n\n",
2520                                 perf_evsel__name(evsel));
2521
2522                 return scnprintf(msg + printed, size - printed,
2523                  "You may not have permission to collect %sstats.\n\n"
2524                  "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2525                  "which controls use of the performance events system by\n"
2526                  "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2527                  "The current value is %d:\n\n"
2528                  "  -1: Allow use of (almost) all events by all users\n"
2529                  "      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2530                  ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2531                  "      Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2532                  ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2533                  ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2534                  "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2535                  "      kernel.perf_event_paranoid = -1\n" ,
2536                                  target->system_wide ? "system-wide " : "",
2537                                  perf_event_paranoid());
2538         case ENOENT:
2539                 return scnprintf(msg, size, "The %s event is not supported.",
2540                                  perf_evsel__name(evsel));
2541         case EMFILE:
2542                 return scnprintf(msg, size, "%s",
2543                          "Too many events are opened.\n"
2544                          "Probably the maximum number of open file descriptors has been reached.\n"
2545                          "Hint: Try again after reducing the number of events.\n"
2546                          "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2547         case ENOMEM:
2548                 if (evsel__has_callchain(evsel) &&
2549                     access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2550                         return scnprintf(msg, size,
2551                                          "Not enough memory to setup event with callchain.\n"
2552                                          "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2553                                          "Hint: Current value: %d", sysctl__max_stack());
2554                 break;
2555         case ENODEV:
2556                 if (target->cpu_list)
2557                         return scnprintf(msg, size, "%s",
2558          "No such device - did you specify an out-of-range profile CPU?");
2559                 break;
2560         case EOPNOTSUPP:
2561                 if (evsel->core.attr.sample_period != 0)
2562                         return scnprintf(msg, size,
2563         "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2564                                          perf_evsel__name(evsel));
2565                 if (evsel->core.attr.precise_ip)
2566                         return scnprintf(msg, size, "%s",
2567         "\'precise\' request may not be supported. Try removing 'p' modifier.");
2568 #if defined(__i386__) || defined(__x86_64__)
2569                 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
2570                         return scnprintf(msg, size, "%s",
2571         "No hardware sampling interrupt available.\n");
2572 #endif
2573                 break;
2574         case EBUSY:
2575                 if (find_process("oprofiled"))
2576                         return scnprintf(msg, size,
2577         "The PMU counters are busy/taken by another profiler.\n"
2578         "We found oprofile daemon running, please stop it and try again.");
2579                 break;
2580         case EINVAL:
2581                 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
2582                         return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2583                 if (perf_missing_features.clockid)
2584                         return scnprintf(msg, size, "clockid feature not supported.");
2585                 if (perf_missing_features.clockid_wrong)
2586                         return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2587                 if (perf_missing_features.aux_output)
2588                         return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
2589                 break;
2590         default:
2591                 break;
2592         }
2593
2594         return scnprintf(msg, size,
2595         "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2596         "/bin/dmesg | grep -i perf may provide additional information.\n",
2597                          err, str_error_r(err, sbuf, sizeof(sbuf)),
2598                          perf_evsel__name(evsel));
2599 }
2600
2601 struct perf_env *perf_evsel__env(struct evsel *evsel)
2602 {
2603         if (evsel && evsel->evlist)
2604                 return evsel->evlist->env;
2605         return &perf_env;
2606 }
2607
2608 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
2609 {
2610         int cpu, thread;
2611
2612         for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
2613                 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
2614                      thread++) {
2615                         int fd = FD(evsel, cpu, thread);
2616
2617                         if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
2618                                                    cpu, thread, fd) < 0)
2619                                 return -1;
2620                 }
2621         }
2622
2623         return 0;
2624 }
2625
2626 int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
2627 {
2628         struct perf_cpu_map *cpus = evsel->core.cpus;
2629         struct perf_thread_map *threads = evsel->core.threads;
2630
2631         if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
2632                 return -ENOMEM;
2633
2634         return store_evsel_ids(evsel, evlist);
2635 }