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