tools/perf/util/evsel.c

   1 /*
   2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   3  *
   4  * Parts came from builtin-{top,stat,record}.c, see those files for further
   5  * copyright notes.
   6  *
   7  * Released under the GPL v2. (and only v2, not any later version)
   8  */
   9
  10 #include <byteswap.h>
  11 #include <errno.h>
  12 #include <inttypes.h>
  13 #include <linux/bitops.h>
  14 #include <api/fs/fs.h>
  15 #include <api/fs/tracing_path.h>
  16 #include <traceevent/event-parse.h>
  17 #include <linux/hw_breakpoint.h>
  18 #include <linux/perf_event.h>
  19 #include <linux/compiler.h>
  20 #include <linux/err.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/resource.h>
  23 #include <sys/types.h>
  24 #include <dirent.h>
  25 #include "asm/bug.h"
  26 #include "callchain.h"
  27 #include "cgroup.h"
  28 #include "event.h"
  29 #include "evsel.h"
  30 #include "evlist.h"
  31 #include "util.h"
  32 #include "cpumap.h"
  33 #include "thread_map.h"
  34 #include "target.h"
  35 #include "perf_regs.h"
  36 #include "debug.h"
  37 #include "trace-event.h"
  38 #include "stat.h"
  39 #include "util/parse-branch-options.h"
  40
  41 #include "sane_ctype.h"
  42
  43 static struct {
  44         bool sample_id_all;
  45         bool exclude_guest;
  46         bool mmap2;
  47         bool cloexec;
  48         bool clockid;
  49         bool clockid_wrong;
  50         bool lbr_flags;
  51         bool write_backward;
  52 } perf_missing_features;
  53
  54 static clockid_t clockid;
  55
  56 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
  57 {
  58         return 0;
  59 }
  60
  61 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
  62 {
  63 }
  64
  65 static struct {
  66         size_t  size;
  67         int     (*init)(struct perf_evsel *evsel);
  68         void    (*fini)(struct perf_evsel *evsel);
  69 } perf_evsel__object = {
  70         .size = sizeof(struct perf_evsel),
  71         .init = perf_evsel__no_extra_init,
  72         .fini = perf_evsel__no_extra_fini,
  73 };
  74
  75 int perf_evsel__object_config(size_t object_size,
  76                               int (*init)(struct perf_evsel *evsel),
  77                               void (*fini)(struct perf_evsel *evsel))
  78 {
  79
  80         if (object_size == 0)
  81                 goto set_methods;
  82
  83         if (perf_evsel__object.size > object_size)
  84                 return -EINVAL;
  85
  86         perf_evsel__object.size = object_size;
  87
  88 set_methods:
  89         if (init != NULL)
  90                 perf_evsel__object.init = init;
  91
  92         if (fini != NULL)
  93                 perf_evsel__object.fini = fini;
  94
  95         return 0;
  96 }
  97
  98 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  99
 100 int __perf_evsel__sample_size(u64 sample_type)
 101 {
 102         u64 mask = sample_type & PERF_SAMPLE_MASK;
 103         int size = 0;
 104         int i;
 105
 106         for (i = 0; i < 64; i++) {
 107                 if (mask & (1ULL << i))
 108                         size++;
 109         }
 110
 111         size *= sizeof(u64);
 112
 113         return size;
 114 }
 115
 116 /**
 117  * __perf_evsel__calc_id_pos - calculate id_pos.
 118  * @sample_type: sample type
 119  *
 120  * This function returns the position of the event id (PERF_SAMPLE_ID or
 121  * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
 122  * sample_event.
 123  */
 124 static int __perf_evsel__calc_id_pos(u64 sample_type)
 125 {
 126         int idx = 0;
 127
 128         if (sample_type & PERF_SAMPLE_IDENTIFIER)
 129                 return 0;
 130
 131         if (!(sample_type & PERF_SAMPLE_ID))
 132                 return -1;
 133
 134         if (sample_type & PERF_SAMPLE_IP)
 135                 idx += 1;
 136
 137         if (sample_type & PERF_SAMPLE_TID)
 138                 idx += 1;
 139
 140         if (sample_type & PERF_SAMPLE_TIME)
 141                 idx += 1;
 142
 143         if (sample_type & PERF_SAMPLE_ADDR)
 144                 idx += 1;
 145
 146         return idx;
 147 }
 148
 149 /**
 150  * __perf_evsel__calc_is_pos - calculate is_pos.
 151  * @sample_type: sample type
 152  *
 153  * This function returns the position (counting backwards) of the event id
 154  * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
 155  * sample_id_all is used there is an id sample appended to non-sample events.
 156  */
 157 static int __perf_evsel__calc_is_pos(u64 sample_type)
 158 {
 159         int idx = 1;
 160
 161         if (sample_type & PERF_SAMPLE_IDENTIFIER)
 162                 return 1;
 163
 164         if (!(sample_type & PERF_SAMPLE_ID))
 165                 return -1;
 166
 167         if (sample_type & PERF_SAMPLE_CPU)
 168                 idx += 1;
 169
 170         if (sample_type & PERF_SAMPLE_STREAM_ID)
 171                 idx += 1;
 172
 173         return idx;
 174 }
 175
 176 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
 177 {
 178         evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
 179         evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
 180 }
 181
 182 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
 183                                   enum perf_event_sample_format bit)
 184 {
 185         if (!(evsel->attr.sample_type & bit)) {
 186                 evsel->attr.sample_type |= bit;
 187                 evsel->sample_size += sizeof(u64);
 188                 perf_evsel__calc_id_pos(evsel);
 189         }
 190 }
 191
 192 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
 193                                     enum perf_event_sample_format bit)
 194 {
 195         if (evsel->attr.sample_type & bit) {
 196                 evsel->attr.sample_type &= ~bit;
 197                 evsel->sample_size -= sizeof(u64);
 198                 perf_evsel__calc_id_pos(evsel);
 199         }
 200 }
 201
 202 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
 203                                bool can_sample_identifier)
 204 {
 205         if (can_sample_identifier) {
 206                 perf_evsel__reset_sample_bit(evsel, ID);
 207                 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
 208         } else {
 209                 perf_evsel__set_sample_bit(evsel, ID);
 210         }
 211         evsel->attr.read_format |= PERF_FORMAT_ID;
 212 }
 213
 214 /**
 215  * perf_evsel__is_function_event - Return whether given evsel is a function
 216  * trace event
 217  *
 218  * @evsel - evsel selector to be tested
 219  *
 220  * Return %true if event is function trace event
 221  */
 222 bool perf_evsel__is_function_event(struct perf_evsel *evsel)
 223 {
 224 #define FUNCTION_EVENT "ftrace:function"
 225
 226         return evsel->name &&
 227                !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
 228
 229 #undef FUNCTION_EVENT
 230 }
 231
 232 void perf_evsel__init(struct perf_evsel *evsel,
 233                       struct perf_event_attr *attr, int idx)
 234 {
 235         evsel->idx         = idx;
 236         evsel->tracking    = !idx;
 237         evsel->attr        = *attr;
 238         evsel->leader      = evsel;
 239         evsel->unit        = "";
 240         evsel->scale       = 1.0;
 241         evsel->evlist      = NULL;
 242         evsel->bpf_fd      = -1;
 243         INIT_LIST_HEAD(&evsel->node);
 244         INIT_LIST_HEAD(&evsel->config_terms);
 245         perf_evsel__object.init(evsel);
 246         evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
 247         perf_evsel__calc_id_pos(evsel);
 248         evsel->cmdline_group_boundary = false;
 249         evsel->metric_expr   = NULL;
 250         evsel->metric_name   = NULL;
 251         evsel->metric_events = NULL;
 252         evsel->collect_stat  = false;
 253 }
 254
 255 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
 256 {
 257         struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
 258
 259         if (evsel != NULL)
 260                 perf_evsel__init(evsel, attr, idx);
 261
 262         if (perf_evsel__is_bpf_output(evsel)) {
 263                 evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 264                                             PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 265                 evsel->attr.sample_period = 1;
 266         }
 267
 268         return evsel;
 269 }
 270
 271 struct perf_evsel *perf_evsel__new_cycles(void)
 272 {
 273         struct perf_event_attr attr = {
 274                 .type   = PERF_TYPE_HARDWARE,
 275                 .config = PERF_COUNT_HW_CPU_CYCLES,
 276                 .exclude_kernel = geteuid() != 0,
 277         };
 278         struct perf_evsel *evsel;
 279
 280         event_attr_init(&attr);
 281         /*
 282          * Unnamed union member, not supported as struct member named
 283          * initializer in older compilers such as gcc 4.4.7
 284          *
 285          * Just for probing the precise_ip:
 286          */
 287         attr.sample_period = 1;
 288
 289         perf_event_attr__set_max_precise_ip(&attr);
 290         /*
 291          * Now let the usual logic to set up the perf_event_attr defaults
 292          * to kick in when we return and before perf_evsel__open() is called.
 293          */
 294         attr.sample_period = 0;
 295
 296         evsel = perf_evsel__new(&attr);
 297         if (evsel == NULL)
 298                 goto out;
 299
 300         /* use asprintf() because free(evsel) assumes name is allocated */
 301         if (asprintf(&evsel->name, "cycles%s%s%.*s",
 302                      (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
 303                      attr.exclude_kernel ? "u" : "",
 304                      attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
 305                 goto error_free;
 306 out:
 307         return evsel;
 308 error_free:
 309         perf_evsel__delete(evsel);
 310         evsel = NULL;
 311         goto out;
 312 }
 313
 314 /*
 315  * Returns pointer with encoded error via <linux/err.h> interface.
 316  */
 317 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
 318 {
 319         struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
 320         int err = -ENOMEM;
 321
 322         if (evsel == NULL) {
 323                 goto out_err;
 324         } else {
 325                 struct perf_event_attr attr = {
 326                         .type          = PERF_TYPE_TRACEPOINT,
 327                         .sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 328                                           PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 329                 };
 330
 331                 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
 332                         goto out_free;
 333
 334                 evsel->tp_format = trace_event__tp_format(sys, name);
 335                 if (IS_ERR(evsel->tp_format)) {
 336                         err = PTR_ERR(evsel->tp_format);
 337                         goto out_free;
 338                 }
 339
 340                 event_attr_init(&attr);
 341                 attr.config = evsel->tp_format->id;
 342                 attr.sample_period = 1;
 343                 perf_evsel__init(evsel, &attr, idx);
 344         }
 345
 346         return evsel;
 347
 348 out_free:
 349         zfree(&evsel->name);
 350         free(evsel);
 351 out_err:
 352         return ERR_PTR(err);
 353 }
 354
 355 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
 356         "cycles",
 357         "instructions",
 358         "cache-references",
 359         "cache-misses",
 360         "branches",
 361         "branch-misses",
 362         "bus-cycles",
 363         "stalled-cycles-frontend",
 364         "stalled-cycles-backend",
 365         "ref-cycles",
 366 };
 367
 368 static const char *__perf_evsel__hw_name(u64 config)
 369 {
 370         if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
 371                 return perf_evsel__hw_names[config];
 372
 373         return "unknown-hardware";
 374 }
 375
 376 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
 377 {
 378         int colon = 0, r = 0;
 379         struct perf_event_attr *attr = &evsel->attr;
 380         bool exclude_guest_default = false;
 381
 382 #define MOD_PRINT(context, mod) do {                                    \
 383                 if (!attr->exclude_##context) {                         \
 384                         if (!colon) colon = ++r;                        \
 385                         r += scnprintf(bf + r, size - r, "%c", mod);    \
 386                 } } while(0)
 387
 388         if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
 389                 MOD_PRINT(kernel, 'k');
 390                 MOD_PRINT(user, 'u');
 391                 MOD_PRINT(hv, 'h');
 392                 exclude_guest_default = true;
 393         }
 394
 395         if (attr->precise_ip) {
 396                 if (!colon)
 397                         colon = ++r;
 398                 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
 399                 exclude_guest_default = true;
 400         }
 401
 402         if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
 403                 MOD_PRINT(host, 'H');
 404                 MOD_PRINT(guest, 'G');
 405         }
 406 #undef MOD_PRINT
 407         if (colon)
 408                 bf[colon - 1] = ':';
 409         return r;
 410 }
 411
 412 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
 413 {
 414         int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
 415         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 416 }
 417
 418 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
 419         "cpu-clock",
 420         "task-clock",
 421         "page-faults",
 422         "context-switches",
 423         "cpu-migrations",
 424         "minor-faults",
 425         "major-faults",
 426         "alignment-faults",
 427         "emulation-faults",
 428         "dummy",
 429 };
 430
 431 static const char *__perf_evsel__sw_name(u64 config)
 432 {
 433         if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
 434                 return perf_evsel__sw_names[config];
 435         return "unknown-software";
 436 }
 437
 438 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
 439 {
 440         int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
 441         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 442 }
 443
 444 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
 445 {
 446         int r;
 447
 448         r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
 449
 450         if (type & HW_BREAKPOINT_R)
 451                 r += scnprintf(bf + r, size - r, "r");
 452
 453         if (type & HW_BREAKPOINT_W)
 454                 r += scnprintf(bf + r, size - r, "w");
 455
 456         if (type & HW_BREAKPOINT_X)
 457                 r += scnprintf(bf + r, size - r, "x");
 458
 459         return r;
 460 }
 461
 462 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
 463 {
 464         struct perf_event_attr *attr = &evsel->attr;
 465         int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
 466         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 467 }
 468
 469 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
 470                                 [PERF_EVSEL__MAX_ALIASES] = {
 471  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
 472  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
 473  { "LLC",       "L2",                                                   },
 474  { "dTLB",      "d-tlb",        "Data-TLB",                             },
 475  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
 476  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
 477  { "node",                                                              },
 478 };
 479
 480 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
 481                                    [PERF_EVSEL__MAX_ALIASES] = {
 482  { "load",      "loads",        "read",                                 },
 483  { "store",     "stores",       "write",                                },
 484  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
 485 };
 486
 487 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
 488                                        [PERF_EVSEL__MAX_ALIASES] = {
 489  { "refs",      "Reference",    "ops",          "access",               },
 490  { "misses",    "miss",                                                 },
 491 };
 492
 493 #define C(x)            PERF_COUNT_HW_CACHE_##x
 494 #define CACHE_READ      (1 << C(OP_READ))
 495 #define CACHE_WRITE     (1 << C(OP_WRITE))
 496 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
 497 #define COP(x)          (1 << x)
 498
 499 /*
 500  * cache operartion stat
 501  * L1I : Read and prefetch only
 502  * ITLB and BPU : Read-only
 503  */
 504 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
 505  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 506  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
 507  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 508  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 509  [C(ITLB)]      = (CACHE_READ),
 510  [C(BPU)]       = (CACHE_READ),
 511  [C(NODE)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 512 };
 513
 514 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
 515 {
 516         if (perf_evsel__hw_cache_stat[type] & COP(op))
 517                 return true;    /* valid */
 518         else
 519                 return false;   /* invalid */
 520 }
 521
 522 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
 523                                             char *bf, size_t size)
 524 {
 525         if (result) {
 526                 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
 527                                  perf_evsel__hw_cache_op[op][0],
 528                                  perf_evsel__hw_cache_result[result][0]);
 529         }
 530
 531         return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
 532                          perf_evsel__hw_cache_op[op][1]);
 533 }
 534
 535 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
 536 {
 537         u8 op, result, type = (config >>  0) & 0xff;
 538         const char *err = "unknown-ext-hardware-cache-type";
 539
 540         if (type >= PERF_COUNT_HW_CACHE_MAX)
 541                 goto out_err;
 542
 543         op = (config >>  8) & 0xff;
 544         err = "unknown-ext-hardware-cache-op";
 545         if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
 546                 goto out_err;
 547
 548         result = (config >> 16) & 0xff;
 549         err = "unknown-ext-hardware-cache-result";
 550         if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
 551                 goto out_err;
 552
 553         err = "invalid-cache";
 554         if (!perf_evsel__is_cache_op_valid(type, op))
 555                 goto out_err;
 556
 557         return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
 558 out_err:
 559         return scnprintf(bf, size, "%s", err);
 560 }
 561
 562 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
 563 {
 564         int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
 565         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 566 }
 567
 568 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
 569 {
 570         int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
 571         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 572 }
 573
 574 const char *perf_evsel__name(struct perf_evsel *evsel)
 575 {
 576         char bf[128];
 577
 578         if (evsel->name)
 579                 return evsel->name;
 580
 581         switch (evsel->attr.type) {
 582         case PERF_TYPE_RAW:
 583                 perf_evsel__raw_name(evsel, bf, sizeof(bf));
 584                 break;
 585
 586         case PERF_TYPE_HARDWARE:
 587                 perf_evsel__hw_name(evsel, bf, sizeof(bf));
 588                 break;
 589
 590         case PERF_TYPE_HW_CACHE:
 591                 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
 592                 break;
 593
 594         case PERF_TYPE_SOFTWARE:
 595                 perf_evsel__sw_name(evsel, bf, sizeof(bf));
 596                 break;
 597
 598         case PERF_TYPE_TRACEPOINT:
 599                 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
 600                 break;
 601
 602         case PERF_TYPE_BREAKPOINT:
 603                 perf_evsel__bp_name(evsel, bf, sizeof(bf));
 604                 break;
 605
 606         default:
 607                 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
 608                           evsel->attr.type);
 609                 break;
 610         }
 611
 612         evsel->name = strdup(bf);
 613
 614         return evsel->name ?: "unknown";
 615 }
 616
 617 const char *perf_evsel__group_name(struct perf_evsel *evsel)
 618 {
 619         return evsel->group_name ?: "anon group";
 620 }
 621
 622 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
 623 {
 624         int ret;
 625         struct perf_evsel *pos;
 626         const char *group_name = perf_evsel__group_name(evsel);
 627
 628         ret = scnprintf(buf, size, "%s", group_name);
 629
 630         ret += scnprintf(buf + ret, size - ret, " { %s",
 631                          perf_evsel__name(evsel));
 632
 633         for_each_group_member(pos, evsel)
 634                 ret += scnprintf(buf + ret, size - ret, ", %s",
 635                                  perf_evsel__name(pos));
 636
 637         ret += scnprintf(buf + ret, size - ret, " }");
 638
 639         return ret;
 640 }
 641
 642 void perf_evsel__config_callchain(struct perf_evsel *evsel,
 643                                   struct record_opts *opts,
 644                                   struct callchain_param *param)
 645 {
 646         bool function = perf_evsel__is_function_event(evsel);
 647         struct perf_event_attr *attr = &evsel->attr;
 648
 649         perf_evsel__set_sample_bit(evsel, CALLCHAIN);
 650
 651         attr->sample_max_stack = param->max_stack;
 652
 653         if (param->record_mode == CALLCHAIN_LBR) {
 654                 if (!opts->branch_stack) {
 655                         if (attr->exclude_user) {
 656                                 pr_warning("LBR callstack option is only available "
 657                                            "to get user callchain information. "
 658                                            "Falling back to framepointers.\n");
 659                         } else {
 660                                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 661                                 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
 662                                                         PERF_SAMPLE_BRANCH_CALL_STACK |
 663                                                         PERF_SAMPLE_BRANCH_NO_CYCLES |
 664                                                         PERF_SAMPLE_BRANCH_NO_FLAGS;
 665                         }
 666                 } else
 667                          pr_warning("Cannot use LBR callstack with branch stack. "
 668                                     "Falling back to framepointers.\n");
 669         }
 670
 671         if (param->record_mode == CALLCHAIN_DWARF) {
 672                 if (!function) {
 673                         perf_evsel__set_sample_bit(evsel, REGS_USER);
 674                         perf_evsel__set_sample_bit(evsel, STACK_USER);
 675                         attr->sample_regs_user = PERF_REGS_MASK;
 676                         attr->sample_stack_user = param->dump_size;
 677                         attr->exclude_callchain_user = 1;
 678                 } else {
 679                         pr_info("Cannot use DWARF unwind for function trace event,"
 680                                 " falling back to framepointers.\n");
 681                 }
 682         }
 683
 684         if (function) {
 685                 pr_info("Disabling user space callchains for function trace event.\n");
 686                 attr->exclude_callchain_user = 1;
 687         }
 688 }
 689
 690 static void
 691 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
 692                             struct callchain_param *param)
 693 {
 694         struct perf_event_attr *attr = &evsel->attr;
 695
 696         perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
 697         if (param->record_mode == CALLCHAIN_LBR) {
 698                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 699                 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
 700                                               PERF_SAMPLE_BRANCH_CALL_STACK);
 701         }
 702         if (param->record_mode == CALLCHAIN_DWARF) {
 703                 perf_evsel__reset_sample_bit(evsel, REGS_USER);
 704                 perf_evsel__reset_sample_bit(evsel, STACK_USER);
 705         }
 706 }
 707
 708 static void apply_config_terms(struct perf_evsel *evsel,
 709                                struct record_opts *opts)
 710 {
 711         struct perf_evsel_config_term *term;
 712         struct list_head *config_terms = &evsel->config_terms;
 713         struct perf_event_attr *attr = &evsel->attr;
 714         struct callchain_param param;
 715         u32 dump_size = 0;
 716         int max_stack = 0;
 717         const char *callgraph_buf = NULL;
 718
 719         /* callgraph default */
 720         param.record_mode = callchain_param.record_mode;
 721
 722         list_for_each_entry(term, config_terms, list) {
 723                 switch (term->type) {
 724                 case PERF_EVSEL__CONFIG_TERM_PERIOD:
 725                         attr->sample_period = term->val.period;
 726                         attr->freq = 0;
 727                         break;
 728                 case PERF_EVSEL__CONFIG_TERM_FREQ:
 729                         attr->sample_freq = term->val.freq;
 730                         attr->freq = 1;
 731                         break;
 732                 case PERF_EVSEL__CONFIG_TERM_TIME:
 733                         if (term->val.time)
 734                                 perf_evsel__set_sample_bit(evsel, TIME);
 735                         else
 736                                 perf_evsel__reset_sample_bit(evsel, TIME);
 737                         break;
 738                 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
 739                         callgraph_buf = term->val.callgraph;
 740                         break;
 741                 case PERF_EVSEL__CONFIG_TERM_BRANCH:
 742                         if (term->val.branch && strcmp(term->val.branch, "no")) {
 743                                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 744                                 parse_branch_str(term->val.branch,
 745                                                  &attr->branch_sample_type);
 746                         } else
 747                                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 748                         break;
 749                 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
 750                         dump_size = term->val.stack_user;
 751                         break;
 752                 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
 753                         max_stack = term->val.max_stack;
 754                         break;
 755                 case PERF_EVSEL__CONFIG_TERM_INHERIT:
 756                         /*
 757                          * attr->inherit should has already been set by
 758                          * perf_evsel__config. If user explicitly set
 759                          * inherit using config terms, override global
 760                          * opt->no_inherit setting.
 761                          */
 762                         attr->inherit = term->val.inherit ? 1 : 0;
 763                         break;
 764                 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
 765                         attr->write_backward = term->val.overwrite ? 1 : 0;
 766                         break;
 767                 default:
 768                         break;
 769                 }
 770         }
 771
 772         /* User explicitly set per-event callgraph, clear the old setting and reset. */
 773         if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
 774                 if (max_stack) {
 775                         param.max_stack = max_stack;
 776                         if (callgraph_buf == NULL)
 777                                 callgraph_buf = "fp";
 778                 }
 779
 780                 /* parse callgraph parameters */
 781                 if (callgraph_buf != NULL) {
 782                         if (!strcmp(callgraph_buf, "no")) {
 783                                 param.enabled = false;
 784                                 param.record_mode = CALLCHAIN_NONE;
 785                         } else {
 786                                 param.enabled = true;
 787                                 if (parse_callchain_record(callgraph_buf, &param)) {
 788                                         pr_err("per-event callgraph setting for %s failed. "
 789                                                "Apply callgraph global setting for it\n",
 790                                                evsel->name);
 791                                         return;
 792                                 }
 793                         }
 794                 }
 795                 if (dump_size > 0) {
 796                         dump_size = round_up(dump_size, sizeof(u64));
 797                         param.dump_size = dump_size;
 798                 }
 799
 800                 /* If global callgraph set, clear it */
 801                 if (callchain_param.enabled)
 802                         perf_evsel__reset_callgraph(evsel, &callchain_param);
 803
 804                 /* set perf-event callgraph */
 805                 if (param.enabled)
 806                         perf_evsel__config_callchain(evsel, opts, &param);
 807         }
 808 }
 809
 810 /*
 811  * The enable_on_exec/disabled value strategy:
 812  *
 813  *  1) For any type of traced program:
 814  *    - all independent events and group leaders are disabled
 815  *    - all group members are enabled
 816  *
 817  *     Group members are ruled by group leaders. They need to
 818  *     be enabled, because the group scheduling relies on that.
 819  *
 820  *  2) For traced programs executed by perf:
 821  *     - all independent events and group leaders have
 822  *       enable_on_exec set
 823  *     - we don't specifically enable or disable any event during
 824  *       the record command
 825  *
 826  *     Independent events and group leaders are initially disabled
 827  *     and get enabled by exec. Group members are ruled by group
 828  *     leaders as stated in 1).
 829  *
 830  *  3) For traced programs attached by perf (pid/tid):
 831  *     - we specifically enable or disable all events during
 832  *       the record command
 833  *
 834  *     When attaching events to already running traced we
 835  *     enable/disable events specifically, as there's no
 836  *     initial traced exec call.
 837  */
 838 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
 839                         struct callchain_param *callchain)
 840 {
 841         struct perf_evsel *leader = evsel->leader;
 842         struct perf_event_attr *attr = &evsel->attr;
 843         int track = evsel->tracking;
 844         bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
 845
 846         attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
 847         attr->inherit       = !opts->no_inherit;
 848         attr->write_backward = opts->overwrite ? 1 : 0;
 849
 850         perf_evsel__set_sample_bit(evsel, IP);
 851         perf_evsel__set_sample_bit(evsel, TID);
 852
 853         if (evsel->sample_read) {
 854                 perf_evsel__set_sample_bit(evsel, READ);
 855
 856                 /*
 857                  * We need ID even in case of single event, because
 858                  * PERF_SAMPLE_READ process ID specific data.
 859                  */
 860                 perf_evsel__set_sample_id(evsel, false);
 861
 862                 /*
 863                  * Apply group format only if we belong to group
 864                  * with more than one members.
 865                  */
 866                 if (leader->nr_members > 1) {
 867                         attr->read_format |= PERF_FORMAT_GROUP;
 868                         attr->inherit = 0;
 869                 }
 870         }
 871
 872         /*
 873          * We default some events to have a default interval. But keep
 874          * it a weak assumption overridable by the user.
 875          */
 876         if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
 877                                      opts->user_interval != ULLONG_MAX)) {
 878                 if (opts->freq) {
 879                         perf_evsel__set_sample_bit(evsel, PERIOD);
 880                         attr->freq              = 1;
 881                         attr->sample_freq       = opts->freq;
 882                 } else {
 883                         attr->sample_period = opts->default_interval;
 884                 }
 885         }
 886
 887         /*
 888          * Disable sampling for all group members other
 889          * than leader in case leader 'leads' the sampling.
 890          */
 891         if ((leader != evsel) && leader->sample_read) {
 892                 attr->sample_freq   = 0;
 893                 attr->sample_period = 0;
 894         }
 895
 896         if (opts->no_samples)
 897                 attr->sample_freq = 0;
 898
 899         if (opts->inherit_stat)
 900                 attr->inherit_stat = 1;
 901
 902         if (opts->sample_address) {
 903                 perf_evsel__set_sample_bit(evsel, ADDR);
 904                 attr->mmap_data = track;
 905         }
 906
 907         /*
 908          * We don't allow user space callchains for  function trace
 909          * event, due to issues with page faults while tracing page
 910          * fault handler and its overall trickiness nature.
 911          */
 912         if (perf_evsel__is_function_event(evsel))
 913                 evsel->attr.exclude_callchain_user = 1;
 914
 915         if (callchain && callchain->enabled && !evsel->no_aux_samples)
 916                 perf_evsel__config_callchain(evsel, opts, callchain);
 917
 918         if (opts->sample_intr_regs) {
 919                 attr->sample_regs_intr = opts->sample_intr_regs;
 920                 perf_evsel__set_sample_bit(evsel, REGS_INTR);
 921         }
 922
 923         if (target__has_cpu(&opts->target) || opts->sample_cpu)
 924                 perf_evsel__set_sample_bit(evsel, CPU);
 925
 926         if (opts->period)
 927                 perf_evsel__set_sample_bit(evsel, PERIOD);
 928
 929         /*
 930          * When the user explicitly disabled time don't force it here.
 931          */
 932         if (opts->sample_time &&
 933             (!perf_missing_features.sample_id_all &&
 934             (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
 935              opts->sample_time_set)))
 936                 perf_evsel__set_sample_bit(evsel, TIME);
 937
 938         if (opts->raw_samples && !evsel->no_aux_samples) {
 939                 perf_evsel__set_sample_bit(evsel, TIME);
 940                 perf_evsel__set_sample_bit(evsel, RAW);
 941                 perf_evsel__set_sample_bit(evsel, CPU);
 942         }
 943
 944         if (opts->sample_address)
 945                 perf_evsel__set_sample_bit(evsel, DATA_SRC);
 946
 947         if (opts->no_buffering) {
 948                 attr->watermark = 0;
 949                 attr->wakeup_events = 1;
 950         }
 951         if (opts->branch_stack && !evsel->no_aux_samples) {
 952                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 953                 attr->branch_sample_type = opts->branch_stack;
 954         }
 955
 956         if (opts->sample_weight)
 957                 perf_evsel__set_sample_bit(evsel, WEIGHT);
 958
 959         attr->task  = track;
 960         attr->mmap  = track;
 961         attr->mmap2 = track && !perf_missing_features.mmap2;
 962         attr->comm  = track;
 963
 964         if (opts->record_namespaces)
 965                 attr->namespaces  = track;
 966
 967         if (opts->record_switch_events)
 968                 attr->context_switch = track;
 969
 970         if (opts->sample_transaction)
 971                 perf_evsel__set_sample_bit(evsel, TRANSACTION);
 972
 973         if (opts->running_time) {
 974                 evsel->attr.read_format |=
 975                         PERF_FORMAT_TOTAL_TIME_ENABLED |
 976                         PERF_FORMAT_TOTAL_TIME_RUNNING;
 977         }
 978
 979         /*
 980          * XXX see the function comment above
 981          *
 982          * Disabling only independent events or group leaders,
 983          * keeping group members enabled.
 984          */
 985         if (perf_evsel__is_group_leader(evsel))
 986                 attr->disabled = 1;
 987
 988         /*
 989          * Setting enable_on_exec for independent events and
 990          * group leaders for traced executed by perf.
 991          */
 992         if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
 993                 !opts->initial_delay)
 994                 attr->enable_on_exec = 1;
 995
 996         if (evsel->immediate) {
 997                 attr->disabled = 0;
 998                 attr->enable_on_exec = 0;
 999         }
1000
1001         clockid = opts->clockid;
1002         if (opts->use_clockid) {
1003                 attr->use_clockid = 1;
1004                 attr->clockid = opts->clockid;
1005         }
1006
1007         if (evsel->precise_max)
1008                 perf_event_attr__set_max_precise_ip(attr);
1009
1010         if (opts->all_user) {
1011                 attr->exclude_kernel = 1;
1012                 attr->exclude_user   = 0;
1013         }
1014
1015         if (opts->all_kernel) {
1016                 attr->exclude_kernel = 0;
1017                 attr->exclude_user   = 1;
1018         }
1019
1020         /*
1021          * Apply event specific term settings,
1022          * it overloads any global configuration.
1023          */
1024         apply_config_terms(evsel, opts);
1025
1026         evsel->ignore_missing_thread = opts->ignore_missing_thread;
1027 }
1028
1029 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1030 {
1031         if (evsel->system_wide)
1032                 nthreads = 1;
1033
1034         evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
1035
1036         if (evsel->fd) {
1037                 int cpu, thread;
1038                 for (cpu = 0; cpu < ncpus; cpu++) {
1039                         for (thread = 0; thread < nthreads; thread++) {
1040                                 FD(evsel, cpu, thread) = -1;
1041                         }
1042                 }
1043         }
1044
1045         return evsel->fd != NULL ? 0 : -ENOMEM;
1046 }
1047
1048 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
1049                           int ioc,  void *arg)
1050 {
1051         int cpu, thread;
1052
1053         if (evsel->system_wide)
1054                 nthreads = 1;
1055
1056         for (cpu = 0; cpu < ncpus; cpu++) {
1057                 for (thread = 0; thread < nthreads; thread++) {
1058                         int fd = FD(evsel, cpu, thread),
1059                             err = ioctl(fd, ioc, arg);
1060
1061                         if (err)
1062                                 return err;
1063                 }
1064         }
1065
1066         return 0;
1067 }
1068
1069 int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
1070                              const char *filter)
1071 {
1072         return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1073                                      PERF_EVENT_IOC_SET_FILTER,
1074                                      (void *)filter);
1075 }
1076
1077 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
1078 {
1079         char *new_filter = strdup(filter);
1080
1081         if (new_filter != NULL) {
1082                 free(evsel->filter);
1083                 evsel->filter = new_filter;
1084                 return 0;
1085         }
1086
1087         return -1;
1088 }
1089
1090 static int perf_evsel__append_filter(struct perf_evsel *evsel,
1091                                      const char *fmt, const char *filter)
1092 {
1093         char *new_filter;
1094
1095         if (evsel->filter == NULL)
1096                 return perf_evsel__set_filter(evsel, filter);
1097
1098         if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1099                 free(evsel->filter);
1100                 evsel->filter = new_filter;
1101                 return 0;
1102         }
1103
1104         return -1;
1105 }
1106
1107 int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
1108 {
1109         return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1110 }
1111
1112 int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
1113 {
1114         return perf_evsel__append_filter(evsel, "%s,%s", filter);
1115 }
1116
1117 int perf_evsel__enable(struct perf_evsel *evsel)
1118 {
1119         int nthreads = thread_map__nr(evsel->threads);
1120         int ncpus = cpu_map__nr(evsel->cpus);
1121
1122         return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1123                                      PERF_EVENT_IOC_ENABLE,
1124                                      0);
1125 }
1126
1127 int perf_evsel__disable(struct perf_evsel *evsel)
1128 {
1129         int nthreads = thread_map__nr(evsel->threads);
1130         int ncpus = cpu_map__nr(evsel->cpus);
1131
1132         return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1133                                      PERF_EVENT_IOC_DISABLE,
1134                                      0);
1135 }
1136
1137 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1138 {
1139         if (ncpus == 0 || nthreads == 0)
1140                 return 0;
1141
1142         if (evsel->system_wide)
1143                 nthreads = 1;
1144
1145         evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1146         if (evsel->sample_id == NULL)
1147                 return -ENOMEM;
1148
1149         evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1150         if (evsel->id == NULL) {
1151                 xyarray__delete(evsel->sample_id);
1152                 evsel->sample_id = NULL;
1153                 return -ENOMEM;
1154         }
1155
1156         return 0;
1157 }
1158
1159 static void perf_evsel__free_fd(struct perf_evsel *evsel)
1160 {
1161         xyarray__delete(evsel->fd);
1162         evsel->fd = NULL;
1163 }
1164
1165 static void perf_evsel__free_id(struct perf_evsel *evsel)
1166 {
1167         xyarray__delete(evsel->sample_id);
1168         evsel->sample_id = NULL;
1169         zfree(&evsel->id);
1170 }
1171
1172 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1173 {
1174         struct perf_evsel_config_term *term, *h;
1175
1176         list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1177                 list_del(&term->list);
1178                 free(term);
1179         }
1180 }
1181
1182 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1183 {
1184         int cpu, thread;
1185
1186         if (evsel->system_wide)
1187                 nthreads = 1;
1188
1189         for (cpu = 0; cpu < ncpus; cpu++)
1190                 for (thread = 0; thread < nthreads; ++thread) {
1191                         close(FD(evsel, cpu, thread));
1192                         FD(evsel, cpu, thread) = -1;
1193                 }
1194 }
1195
1196 void perf_evsel__exit(struct perf_evsel *evsel)
1197 {
1198         assert(list_empty(&evsel->node));
1199         assert(evsel->evlist == NULL);
1200         perf_evsel__free_fd(evsel);
1201         perf_evsel__free_id(evsel);
1202         perf_evsel__free_config_terms(evsel);
1203         close_cgroup(evsel->cgrp);
1204         cpu_map__put(evsel->cpus);
1205         cpu_map__put(evsel->own_cpus);
1206         thread_map__put(evsel->threads);
1207         zfree(&evsel->group_name);
1208         zfree(&evsel->name);
1209         perf_evsel__object.fini(evsel);
1210 }
1211
1212 void perf_evsel__delete(struct perf_evsel *evsel)
1213 {
1214         perf_evsel__exit(evsel);
1215         free(evsel);
1216 }
1217
1218 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1219                                 struct perf_counts_values *count)
1220 {
1221         struct perf_counts_values tmp;
1222
1223         if (!evsel->prev_raw_counts)
1224                 return;
1225
1226         if (cpu == -1) {
1227                 tmp = evsel->prev_raw_counts->aggr;
1228                 evsel->prev_raw_counts->aggr = *count;
1229         } else {
1230                 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1231                 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1232         }
1233
1234         count->val = count->val - tmp.val;
1235         count->ena = count->ena - tmp.ena;
1236         count->run = count->run - tmp.run;
1237 }
1238
1239 void perf_counts_values__scale(struct perf_counts_values *count,
1240                                bool scale, s8 *pscaled)
1241 {
1242         s8 scaled = 0;
1243
1244         if (scale) {
1245                 if (count->run == 0) {
1246                         scaled = -1;
1247                         count->val = 0;
1248                 } else if (count->run < count->ena) {
1249                         scaled = 1;
1250                         count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1251                 }
1252         } else
1253                 count->ena = count->run = 0;
1254
1255         if (pscaled)
1256                 *pscaled = scaled;
1257 }
1258
1259 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1260                      struct perf_counts_values *count)
1261 {
1262         memset(count, 0, sizeof(*count));
1263
1264         if (FD(evsel, cpu, thread) < 0)
1265                 return -EINVAL;
1266
1267         if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) <= 0)
1268                 return -errno;
1269
1270         return 0;
1271 }
1272
1273 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1274                               int cpu, int thread, bool scale)
1275 {
1276         struct perf_counts_values count;
1277         size_t nv = scale ? 3 : 1;
1278
1279         if (FD(evsel, cpu, thread) < 0)
1280                 return -EINVAL;
1281
1282         if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1283                 return -ENOMEM;
1284
1285         if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1286                 return -errno;
1287
1288         perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1289         perf_counts_values__scale(&count, scale, NULL);
1290         *perf_counts(evsel->counts, cpu, thread) = count;
1291         return 0;
1292 }
1293
1294 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1295 {
1296         struct perf_evsel *leader = evsel->leader;
1297         int fd;
1298
1299         if (perf_evsel__is_group_leader(evsel))
1300                 return -1;
1301
1302         /*
1303          * Leader must be already processed/open,
1304          * if not it's a bug.
1305          */
1306         BUG_ON(!leader->fd);
1307
1308         fd = FD(leader, cpu, thread);
1309         BUG_ON(fd == -1);
1310
1311         return fd;
1312 }
1313
1314 struct bit_names {
1315         int bit;
1316         const char *name;
1317 };
1318
1319 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1320 {
1321         bool first_bit = true;
1322         int i = 0;
1323
1324         do {
1325                 if (value & bits[i].bit) {
1326                         buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1327                         first_bit = false;
1328                 }
1329         } while (bits[++i].name != NULL);
1330 }
1331
1332 static void __p_sample_type(char *buf, size_t size, u64 value)
1333 {
1334 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1335         struct bit_names bits[] = {
1336                 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1337                 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1338                 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1339                 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1340                 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1341                 bit_name(WEIGHT),
1342                 { .name = NULL, }
1343         };
1344 #undef bit_name
1345         __p_bits(buf, size, value, bits);
1346 }
1347
1348 static void __p_branch_sample_type(char *buf, size_t size, u64 value)
1349 {
1350 #define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
1351         struct bit_names bits[] = {
1352                 bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
1353                 bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
1354                 bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
1355                 bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
1356                 bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
1357                 { .name = NULL, }
1358         };
1359 #undef bit_name
1360         __p_bits(buf, size, value, bits);
1361 }
1362
1363 static void __p_read_format(char *buf, size_t size, u64 value)
1364 {
1365 #define bit_name(n) { PERF_FORMAT_##n, #n }
1366         struct bit_names bits[] = {
1367                 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1368                 bit_name(ID), bit_name(GROUP),
1369                 { .name = NULL, }
1370         };
1371 #undef bit_name
1372         __p_bits(buf, size, value, bits);
1373 }
1374
1375 #define BUF_SIZE                1024
1376
1377 #define p_hex(val)              snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1378 #define p_unsigned(val)         snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1379 #define p_signed(val)           snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1380 #define p_sample_type(val)      __p_sample_type(buf, BUF_SIZE, val)
1381 #define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1382 #define p_read_format(val)      __p_read_format(buf, BUF_SIZE, val)
1383
1384 #define PRINT_ATTRn(_n, _f, _p)                         \
1385 do {                                                    \
1386         if (attr->_f) {                                 \
1387                 _p(attr->_f);                           \
1388                 ret += attr__fprintf(fp, _n, buf, priv);\
1389         }                                               \
1390 } while (0)
1391
1392 #define PRINT_ATTRf(_f, _p)     PRINT_ATTRn(#_f, _f, _p)
1393
1394 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1395                              attr__fprintf_f attr__fprintf, void *priv)
1396 {
1397         char buf[BUF_SIZE];
1398         int ret = 0;
1399
1400         PRINT_ATTRf(type, p_unsigned);
1401         PRINT_ATTRf(size, p_unsigned);
1402         PRINT_ATTRf(config, p_hex);
1403         PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1404         PRINT_ATTRf(sample_type, p_sample_type);
1405         PRINT_ATTRf(read_format, p_read_format);
1406
1407         PRINT_ATTRf(disabled, p_unsigned);
1408         PRINT_ATTRf(inherit, p_unsigned);
1409         PRINT_ATTRf(pinned, p_unsigned);
1410         PRINT_ATTRf(exclusive, p_unsigned);
1411         PRINT_ATTRf(exclude_user, p_unsigned);
1412         PRINT_ATTRf(exclude_kernel, p_unsigned);
1413         PRINT_ATTRf(exclude_hv, p_unsigned);
1414         PRINT_ATTRf(exclude_idle, p_unsigned);
1415         PRINT_ATTRf(mmap, p_unsigned);
1416         PRINT_ATTRf(comm, p_unsigned);
1417         PRINT_ATTRf(freq, p_unsigned);
1418         PRINT_ATTRf(inherit_stat, p_unsigned);
1419         PRINT_ATTRf(enable_on_exec, p_unsigned);
1420         PRINT_ATTRf(task, p_unsigned);
1421         PRINT_ATTRf(watermark, p_unsigned);
1422         PRINT_ATTRf(precise_ip, p_unsigned);
1423         PRINT_ATTRf(mmap_data, p_unsigned);
1424         PRINT_ATTRf(sample_id_all, p_unsigned);
1425         PRINT_ATTRf(exclude_host, p_unsigned);
1426         PRINT_ATTRf(exclude_guest, p_unsigned);
1427         PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1428         PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1429         PRINT_ATTRf(mmap2, p_unsigned);
1430         PRINT_ATTRf(comm_exec, p_unsigned);
1431         PRINT_ATTRf(use_clockid, p_unsigned);
1432         PRINT_ATTRf(context_switch, p_unsigned);
1433         PRINT_ATTRf(write_backward, p_unsigned);
1434
1435         PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1436         PRINT_ATTRf(bp_type, p_unsigned);
1437         PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1438         PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1439         PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1440         PRINT_ATTRf(sample_regs_user, p_hex);
1441         PRINT_ATTRf(sample_stack_user, p_unsigned);
1442         PRINT_ATTRf(clockid, p_signed);
1443         PRINT_ATTRf(sample_regs_intr, p_hex);
1444         PRINT_ATTRf(aux_watermark, p_unsigned);
1445         PRINT_ATTRf(sample_max_stack, p_unsigned);
1446
1447         return ret;
1448 }
1449
1450 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1451                                 void *priv __maybe_unused)
1452 {
1453         return fprintf(fp, "  %-32s %s\n", name, val);
1454 }
1455
1456 static bool ignore_missing_thread(struct perf_evsel *evsel,
1457                                   struct thread_map *threads,
1458                                   int thread, int err)
1459 {
1460         if (!evsel->ignore_missing_thread)
1461                 return false;
1462
1463         /* The system wide setup does not work with threads. */
1464         if (evsel->system_wide)
1465                 return false;
1466
1467         /* The -ESRCH is perf event syscall errno for pid's not found. */
1468         if (err != -ESRCH)
1469                 return false;
1470
1471         /* If there's only one thread, let it fail. */
1472         if (threads->nr == 1)
1473                 return false;
1474
1475         if (thread_map__remove(threads, thread))
1476                 return false;
1477
1478         pr_warning("WARNING: Ignored open failure for pid %d\n",
1479                    thread_map__pid(threads, thread));
1480         return true;
1481 }
1482
1483 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1484                      struct thread_map *threads)
1485 {
1486         int cpu, thread, nthreads;
1487         unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1488         int pid = -1, err;
1489         enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1490
1491         if (perf_missing_features.write_backward && evsel->attr.write_backward)
1492                 return -EINVAL;
1493
1494         if (cpus == NULL) {
1495                 static struct cpu_map *empty_cpu_map;
1496
1497                 if (empty_cpu_map == NULL) {
1498                         empty_cpu_map = cpu_map__dummy_new();
1499                         if (empty_cpu_map == NULL)
1500                                 return -ENOMEM;
1501                 }
1502
1503                 cpus = empty_cpu_map;
1504         }
1505
1506         if (threads == NULL) {
1507                 static struct thread_map *empty_thread_map;
1508
1509                 if (empty_thread_map == NULL) {
1510                         empty_thread_map = thread_map__new_by_tid(-1);
1511                         if (empty_thread_map == NULL)
1512                                 return -ENOMEM;
1513                 }
1514
1515                 threads = empty_thread_map;
1516         }
1517
1518         if (evsel->system_wide)
1519                 nthreads = 1;
1520         else
1521                 nthreads = threads->nr;
1522
1523         if (evsel->fd == NULL &&
1524             perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1525                 return -ENOMEM;
1526
1527         if (evsel->cgrp) {
1528                 flags |= PERF_FLAG_PID_CGROUP;
1529                 pid = evsel->cgrp->fd;
1530         }
1531
1532 fallback_missing_features:
1533         if (perf_missing_features.clockid_wrong)
1534                 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1535         if (perf_missing_features.clockid) {
1536                 evsel->attr.use_clockid = 0;
1537                 evsel->attr.clockid = 0;
1538         }
1539         if (perf_missing_features.cloexec)
1540                 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1541         if (perf_missing_features.mmap2)
1542                 evsel->attr.mmap2 = 0;
1543         if (perf_missing_features.exclude_guest)
1544                 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1545         if (perf_missing_features.lbr_flags)
1546                 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1547                                      PERF_SAMPLE_BRANCH_NO_CYCLES);
1548 retry_sample_id:
1549         if (perf_missing_features.sample_id_all)
1550                 evsel->attr.sample_id_all = 0;
1551
1552         if (verbose >= 2) {
1553                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1554                 fprintf(stderr, "perf_event_attr:\n");
1555                 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1556                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1557         }
1558
1559         for (cpu = 0; cpu < cpus->nr; cpu++) {
1560
1561                 for (thread = 0; thread < nthreads; thread++) {
1562                         int fd, group_fd;
1563
1564                         if (!evsel->cgrp && !evsel->system_wide)
1565                                 pid = thread_map__pid(threads, thread);
1566
1567                         group_fd = get_group_fd(evsel, cpu, thread);
1568 retry_open:
1569                         pr_debug2("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
1570                                   pid, cpus->map[cpu], group_fd, flags);
1571
1572                         fd = sys_perf_event_open(&evsel->attr, pid, cpus->map[cpu],
1573                                                  group_fd, flags);
1574
1575                         FD(evsel, cpu, thread) = fd;
1576
1577                         if (fd < 0) {
1578                                 err = -errno;
1579
1580                                 if (ignore_missing_thread(evsel, threads, thread, err)) {
1581                                         /*
1582                                          * We just removed 1 thread, so take a step
1583                                          * back on thread index and lower the upper
1584                                          * nthreads limit.
1585                                          */
1586                                         nthreads--;
1587                                         thread--;
1588
1589                                         /* ... and pretend like nothing have happened. */
1590                                         err = 0;
1591                                         continue;
1592                                 }
1593
1594                                 pr_debug2("\nsys_perf_event_open failed, error %d\n",
1595                                           err);
1596                                 goto try_fallback;
1597                         }
1598
1599                         pr_debug2(" = %d\n", fd);
1600
1601                         if (evsel->bpf_fd >= 0) {
1602                                 int evt_fd = fd;
1603                                 int bpf_fd = evsel->bpf_fd;
1604
1605                                 err = ioctl(evt_fd,
1606                                             PERF_EVENT_IOC_SET_BPF,
1607                                             bpf_fd);
1608                                 if (err && errno != EEXIST) {
1609                                         pr_err("failed to attach bpf fd %d: %s\n",
1610                                                bpf_fd, strerror(errno));
1611                                         err = -EINVAL;
1612                                         goto out_close;
1613                                 }
1614                         }
1615
1616                         set_rlimit = NO_CHANGE;
1617
1618                         /*
1619                          * If we succeeded but had to kill clockid, fail and
1620                          * have perf_evsel__open_strerror() print us a nice
1621                          * error.
1622                          */
1623                         if (perf_missing_features.clockid ||
1624                             perf_missing_features.clockid_wrong) {
1625                                 err = -EINVAL;
1626                                 goto out_close;
1627                         }
1628                 }
1629         }
1630
1631         return 0;
1632
1633 try_fallback:
1634         /*
1635          * perf stat needs between 5 and 22 fds per CPU. When we run out
1636          * of them try to increase the limits.
1637          */
1638         if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1639                 struct rlimit l;
1640                 int old_errno = errno;
1641
1642                 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1643                         if (set_rlimit == NO_CHANGE)
1644                                 l.rlim_cur = l.rlim_max;
1645                         else {
1646                                 l.rlim_cur = l.rlim_max + 1000;
1647                                 l.rlim_max = l.rlim_cur;
1648                         }
1649                         if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1650                                 set_rlimit++;
1651                                 errno = old_errno;
1652                                 goto retry_open;
1653                         }
1654                 }
1655                 errno = old_errno;
1656         }
1657
1658         if (err != -EINVAL || cpu > 0 || thread > 0)
1659                 goto out_close;
1660
1661         /*
1662          * Must probe features in the order they were added to the
1663          * perf_event_attr interface.
1664          */
1665         if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
1666                 perf_missing_features.write_backward = true;
1667                 goto out_close;
1668         } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1669                 perf_missing_features.clockid_wrong = true;
1670                 goto fallback_missing_features;
1671         } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1672                 perf_missing_features.clockid = true;
1673                 goto fallback_missing_features;
1674         } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1675                 perf_missing_features.cloexec = true;
1676                 goto fallback_missing_features;
1677         } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1678                 perf_missing_features.mmap2 = true;
1679                 goto fallback_missing_features;
1680         } else if (!perf_missing_features.exclude_guest &&
1681                    (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1682                 perf_missing_features.exclude_guest = true;
1683                 goto fallback_missing_features;
1684         } else if (!perf_missing_features.sample_id_all) {
1685                 perf_missing_features.sample_id_all = true;
1686                 goto retry_sample_id;
1687         } else if (!perf_missing_features.lbr_flags &&
1688                         (evsel->attr.branch_sample_type &
1689                          (PERF_SAMPLE_BRANCH_NO_CYCLES |
1690                           PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1691                 perf_missing_features.lbr_flags = true;
1692                 goto fallback_missing_features;
1693         }
1694 out_close:
1695         do {
1696                 while (--thread >= 0) {
1697                         close(FD(evsel, cpu, thread));
1698                         FD(evsel, cpu, thread) = -1;
1699                 }
1700                 thread = nthreads;
1701         } while (--cpu >= 0);
1702         return err;
1703 }
1704
1705 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1706 {
1707         if (evsel->fd == NULL)
1708                 return;
1709
1710         perf_evsel__close_fd(evsel, ncpus, nthreads);
1711         perf_evsel__free_fd(evsel);
1712 }
1713
1714 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1715                              struct cpu_map *cpus)
1716 {
1717         return perf_evsel__open(evsel, cpus, NULL);
1718 }
1719
1720 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1721                                 struct thread_map *threads)
1722 {
1723         return perf_evsel__open(evsel, NULL, threads);
1724 }
1725
1726 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1727                                        const union perf_event *event,
1728                                        struct perf_sample *sample)
1729 {
1730         u64 type = evsel->attr.sample_type;
1731         const u64 *array = event->sample.array;
1732         bool swapped = evsel->needs_swap;
1733         union u64_swap u;
1734
1735         array += ((event->header.size -
1736                    sizeof(event->header)) / sizeof(u64)) - 1;
1737
1738         if (type & PERF_SAMPLE_IDENTIFIER) {
1739                 sample->id = *array;
1740                 array--;
1741         }
1742
1743         if (type & PERF_SAMPLE_CPU) {
1744                 u.val64 = *array;
1745                 if (swapped) {
1746                         /* undo swap of u64, then swap on individual u32s */
1747                         u.val64 = bswap_64(u.val64);
1748                         u.val32[0] = bswap_32(u.val32[0]);
1749                 }
1750
1751                 sample->cpu = u.val32[0];
1752                 array--;
1753         }
1754
1755         if (type & PERF_SAMPLE_STREAM_ID) {
1756                 sample->stream_id = *array;
1757                 array--;
1758         }
1759
1760         if (type & PERF_SAMPLE_ID) {
1761                 sample->id = *array;
1762                 array--;
1763         }
1764
1765         if (type & PERF_SAMPLE_TIME) {
1766                 sample->time = *array;
1767                 array--;
1768         }
1769
1770         if (type & PERF_SAMPLE_TID) {
1771                 u.val64 = *array;
1772                 if (swapped) {
1773                         /* undo swap of u64, then swap on individual u32s */
1774                         u.val64 = bswap_64(u.val64);
1775                         u.val32[0] = bswap_32(u.val32[0]);
1776                         u.val32[1] = bswap_32(u.val32[1]);
1777                 }
1778
1779                 sample->pid = u.val32[0];
1780                 sample->tid = u.val32[1];
1781                 array--;
1782         }
1783
1784         return 0;
1785 }
1786
1787 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1788                             u64 size)
1789 {
1790         return size > max_size || offset + size > endp;
1791 }
1792
1793 #define OVERFLOW_CHECK(offset, size, max_size)                          \
1794         do {                                                            \
1795                 if (overflow(endp, (max_size), (offset), (size)))       \
1796                         return -EFAULT;                                 \
1797         } while (0)
1798
1799 #define OVERFLOW_CHECK_u64(offset) \
1800         OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1801
1802 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1803                              struct perf_sample *data)
1804 {
1805         u64 type = evsel->attr.sample_type;
1806         bool swapped = evsel->needs_swap;
1807         const u64 *array;
1808         u16 max_size = event->header.size;
1809         const void *endp = (void *)event + max_size;
1810         u64 sz;
1811
1812         /*
1813          * used for cross-endian analysis. See git commit 65014ab3
1814          * for why this goofiness is needed.
1815          */
1816         union u64_swap u;
1817
1818         memset(data, 0, sizeof(*data));
1819         data->cpu = data->pid = data->tid = -1;
1820         data->stream_id = data->id = data->time = -1ULL;
1821         data->period = evsel->attr.sample_period;
1822         data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1823
1824         if (event->header.type != PERF_RECORD_SAMPLE) {
1825                 if (!evsel->attr.sample_id_all)
1826                         return 0;
1827                 return perf_evsel__parse_id_sample(evsel, event, data);
1828         }
1829
1830         array = event->sample.array;
1831
1832         /*
1833          * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1834          * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
1835          * check the format does not go past the end of the event.
1836          */
1837         if (evsel->sample_size + sizeof(event->header) > event->header.size)
1838                 return -EFAULT;
1839
1840         data->id = -1ULL;
1841         if (type & PERF_SAMPLE_IDENTIFIER) {
1842                 data->id = *array;
1843                 array++;
1844         }
1845
1846         if (type & PERF_SAMPLE_IP) {
1847                 data->ip = *array;
1848                 array++;
1849         }
1850
1851         if (type & PERF_SAMPLE_TID) {
1852                 u.val64 = *array;
1853                 if (swapped) {
1854                         /* undo swap of u64, then swap on individual u32s */
1855                         u.val64 = bswap_64(u.val64);
1856                         u.val32[0] = bswap_32(u.val32[0]);
1857                         u.val32[1] = bswap_32(u.val32[1]);
1858                 }
1859
1860                 data->pid = u.val32[0];
1861                 data->tid = u.val32[1];
1862                 array++;
1863         }
1864
1865         if (type & PERF_SAMPLE_TIME) {
1866                 data->time = *array;
1867                 array++;
1868         }
1869
1870         data->addr = 0;
1871         if (type & PERF_SAMPLE_ADDR) {
1872                 data->addr = *array;
1873                 array++;
1874         }
1875
1876         if (type & PERF_SAMPLE_ID) {
1877                 data->id = *array;
1878                 array++;
1879         }
1880
1881         if (type & PERF_SAMPLE_STREAM_ID) {
1882                 data->stream_id = *array;
1883                 array++;
1884         }
1885
1886         if (type & PERF_SAMPLE_CPU) {
1887
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                 }
1894
1895                 data->cpu = u.val32[0];
1896                 array++;
1897         }
1898
1899         if (type & PERF_SAMPLE_PERIOD) {
1900                 data->period = *array;
1901                 array++;
1902         }
1903
1904         if (type & PERF_SAMPLE_READ) {
1905                 u64 read_format = evsel->attr.read_format;
1906
1907                 OVERFLOW_CHECK_u64(array);
1908                 if (read_format & PERF_FORMAT_GROUP)
1909                         data->read.group.nr = *array;
1910                 else
1911                         data->read.one.value = *array;
1912
1913                 array++;
1914
1915                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1916                         OVERFLOW_CHECK_u64(array);
1917                         data->read.time_enabled = *array;
1918                         array++;
1919                 }
1920
1921                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1922                         OVERFLOW_CHECK_u64(array);
1923                         data->read.time_running = *array;
1924                         array++;
1925                 }
1926
1927                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1928                 if (read_format & PERF_FORMAT_GROUP) {
1929                         const u64 max_group_nr = UINT64_MAX /
1930                                         sizeof(struct sample_read_value);
1931
1932                         if (data->read.group.nr > max_group_nr)
1933                                 return -EFAULT;
1934                         sz = data->read.group.nr *
1935                              sizeof(struct sample_read_value);
1936                         OVERFLOW_CHECK(array, sz, max_size);
1937                         data->read.group.values =
1938                                         (struct sample_read_value *)array;
1939                         array = (void *)array + sz;
1940                 } else {
1941                         OVERFLOW_CHECK_u64(array);
1942                         data->read.one.id = *array;
1943                         array++;
1944                 }
1945         }
1946
1947         if (type & PERF_SAMPLE_CALLCHAIN) {
1948                 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1949
1950                 OVERFLOW_CHECK_u64(array);
1951                 data->callchain = (struct ip_callchain *)array++;
1952                 if (data->callchain->nr > max_callchain_nr)
1953                         return -EFAULT;
1954                 sz = data->callchain->nr * sizeof(u64);
1955                 OVERFLOW_CHECK(array, sz, max_size);
1956                 array = (void *)array + sz;
1957         }
1958
1959         if (type & PERF_SAMPLE_RAW) {
1960                 OVERFLOW_CHECK_u64(array);
1961                 u.val64 = *array;
1962                 if (WARN_ONCE(swapped,
1963                               "Endianness of raw data not corrected!\n")) {
1964                         /* undo swap of u64, then swap on individual u32s */
1965                         u.val64 = bswap_64(u.val64);
1966                         u.val32[0] = bswap_32(u.val32[0]);
1967                         u.val32[1] = bswap_32(u.val32[1]);
1968                 }
1969                 data->raw_size = u.val32[0];
1970                 array = (void *)array + sizeof(u32);
1971
1972                 OVERFLOW_CHECK(array, data->raw_size, max_size);
1973                 data->raw_data = (void *)array;
1974                 array = (void *)array + data->raw_size;
1975         }
1976
1977         if (type & PERF_SAMPLE_BRANCH_STACK) {
1978                 const u64 max_branch_nr = UINT64_MAX /
1979                                           sizeof(struct branch_entry);
1980
1981                 OVERFLOW_CHECK_u64(array);
1982                 data->branch_stack = (struct branch_stack *)array++;
1983
1984                 if (data->branch_stack->nr > max_branch_nr)
1985                         return -EFAULT;
1986                 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1987                 OVERFLOW_CHECK(array, sz, max_size);
1988                 array = (void *)array + sz;
1989         }
1990
1991         if (type & PERF_SAMPLE_REGS_USER) {
1992                 OVERFLOW_CHECK_u64(array);
1993                 data->user_regs.abi = *array;
1994                 array++;
1995
1996                 if (data->user_regs.abi) {
1997                         u64 mask = evsel->attr.sample_regs_user;
1998
1999                         sz = hweight_long(mask) * sizeof(u64);
2000                         OVERFLOW_CHECK(array, sz, max_size);
2001                         data->user_regs.mask = mask;
2002                         data->user_regs.regs = (u64 *)array;
2003                         array = (void *)array + sz;
2004                 }
2005         }
2006
2007         if (type & PERF_SAMPLE_STACK_USER) {
2008                 OVERFLOW_CHECK_u64(array);
2009                 sz = *array++;
2010
2011                 data->user_stack.offset = ((char *)(array - 1)
2012                                           - (char *) event);
2013
2014                 if (!sz) {
2015                         data->user_stack.size = 0;
2016                 } else {
2017                         OVERFLOW_CHECK(array, sz, max_size);
2018                         data->user_stack.data = (char *)array;
2019                         array = (void *)array + sz;
2020                         OVERFLOW_CHECK_u64(array);
2021                         data->user_stack.size = *array++;
2022                         if (WARN_ONCE(data->user_stack.size > sz,
2023                                       "user stack dump failure\n"))
2024                                 return -EFAULT;
2025                 }
2026         }
2027
2028         if (type & PERF_SAMPLE_WEIGHT) {
2029                 OVERFLOW_CHECK_u64(array);
2030                 data->weight = *array;
2031                 array++;
2032         }
2033
2034         data->data_src = PERF_MEM_DATA_SRC_NONE;
2035         if (type & PERF_SAMPLE_DATA_SRC) {
2036                 OVERFLOW_CHECK_u64(array);
2037                 data->data_src = *array;
2038                 array++;
2039         }
2040
2041         data->transaction = 0;
2042         if (type & PERF_SAMPLE_TRANSACTION) {
2043                 OVERFLOW_CHECK_u64(array);
2044                 data->transaction = *array;
2045                 array++;
2046         }
2047
2048         data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2049         if (type & PERF_SAMPLE_REGS_INTR) {
2050                 OVERFLOW_CHECK_u64(array);
2051                 data->intr_regs.abi = *array;
2052                 array++;
2053
2054                 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2055                         u64 mask = evsel->attr.sample_regs_intr;
2056
2057                         sz = hweight_long(mask) * sizeof(u64);
2058                         OVERFLOW_CHECK(array, sz, max_size);
2059                         data->intr_regs.mask = mask;
2060                         data->intr_regs.regs = (u64 *)array;
2061                         array = (void *)array + sz;
2062                 }
2063         }
2064
2065         return 0;
2066 }
2067
2068 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
2069                                      u64 read_format)
2070 {
2071         size_t sz, result = sizeof(struct sample_event);
2072
2073         if (type & PERF_SAMPLE_IDENTIFIER)
2074                 result += sizeof(u64);
2075
2076         if (type & PERF_SAMPLE_IP)
2077                 result += sizeof(u64);
2078
2079         if (type & PERF_SAMPLE_TID)
2080                 result += sizeof(u64);
2081
2082         if (type & PERF_SAMPLE_TIME)
2083                 result += sizeof(u64);
2084
2085         if (type & PERF_SAMPLE_ADDR)
2086                 result += sizeof(u64);
2087
2088         if (type & PERF_SAMPLE_ID)
2089                 result += sizeof(u64);
2090
2091         if (type & PERF_SAMPLE_STREAM_ID)
2092                 result += sizeof(u64);
2093
2094         if (type & PERF_SAMPLE_CPU)
2095                 result += sizeof(u64);
2096
2097         if (type & PERF_SAMPLE_PERIOD)
2098                 result += sizeof(u64);
2099
2100         if (type & PERF_SAMPLE_READ) {
2101                 result += sizeof(u64);
2102                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
2103                         result += sizeof(u64);
2104                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
2105                         result += sizeof(u64);
2106                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2107                 if (read_format & PERF_FORMAT_GROUP) {
2108                         sz = sample->read.group.nr *
2109                              sizeof(struct sample_read_value);
2110                         result += sz;
2111                 } else {
2112                         result += sizeof(u64);
2113                 }
2114         }
2115
2116         if (type & PERF_SAMPLE_CALLCHAIN) {
2117                 sz = (sample->callchain->nr + 1) * sizeof(u64);
2118                 result += sz;
2119         }
2120
2121         if (type & PERF_SAMPLE_RAW) {
2122                 result += sizeof(u32);
2123                 result += sample->raw_size;
2124         }
2125
2126         if (type & PERF_SAMPLE_BRANCH_STACK) {
2127                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2128                 sz += sizeof(u64);
2129                 result += sz;
2130         }
2131
2132         if (type & PERF_SAMPLE_REGS_USER) {
2133                 if (sample->user_regs.abi) {
2134                         result += sizeof(u64);
2135                         sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2136                         result += sz;
2137                 } else {
2138                         result += sizeof(u64);
2139                 }
2140         }
2141
2142         if (type & PERF_SAMPLE_STACK_USER) {
2143                 sz = sample->user_stack.size;
2144                 result += sizeof(u64);
2145                 if (sz) {
2146                         result += sz;
2147                         result += sizeof(u64);
2148                 }
2149         }
2150
2151         if (type & PERF_SAMPLE_WEIGHT)
2152                 result += sizeof(u64);
2153
2154         if (type & PERF_SAMPLE_DATA_SRC)
2155                 result += sizeof(u64);
2156
2157         if (type & PERF_SAMPLE_TRANSACTION)
2158                 result += sizeof(u64);
2159
2160         if (type & PERF_SAMPLE_REGS_INTR) {
2161                 if (sample->intr_regs.abi) {
2162                         result += sizeof(u64);
2163                         sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2164                         result += sz;
2165                 } else {
2166                         result += sizeof(u64);
2167                 }
2168         }
2169
2170         return result;
2171 }
2172
2173 int perf_event__synthesize_sample(union perf_event *event, u64 type,
2174                                   u64 read_format,
2175                                   const struct perf_sample *sample,
2176                                   bool swapped)
2177 {
2178         u64 *array;
2179         size_t sz;
2180         /*
2181          * used for cross-endian analysis. See git commit 65014ab3
2182          * for why this goofiness is needed.
2183          */
2184         union u64_swap u;
2185
2186         array = event->sample.array;
2187
2188         if (type & PERF_SAMPLE_IDENTIFIER) {
2189                 *array = sample->id;
2190                 array++;
2191         }
2192
2193         if (type & PERF_SAMPLE_IP) {
2194                 *array = sample->ip;
2195                 array++;
2196         }
2197
2198         if (type & PERF_SAMPLE_TID) {
2199                 u.val32[0] = sample->pid;
2200                 u.val32[1] = sample->tid;
2201                 if (swapped) {
2202                         /*
2203                          * Inverse of what is done in perf_evsel__parse_sample
2204                          */
2205                         u.val32[0] = bswap_32(u.val32[0]);
2206                         u.val32[1] = bswap_32(u.val32[1]);
2207                         u.val64 = bswap_64(u.val64);
2208                 }
2209
2210                 *array = u.val64;
2211                 array++;
2212         }
2213
2214         if (type & PERF_SAMPLE_TIME) {
2215                 *array = sample->time;
2216                 array++;
2217         }
2218
2219         if (type & PERF_SAMPLE_ADDR) {
2220                 *array = sample->addr;
2221                 array++;
2222         }
2223
2224         if (type & PERF_SAMPLE_ID) {
2225                 *array = sample->id;
2226                 array++;
2227         }
2228
2229         if (type & PERF_SAMPLE_STREAM_ID) {
2230                 *array = sample->stream_id;
2231                 array++;
2232         }
2233
2234         if (type & PERF_SAMPLE_CPU) {
2235                 u.val32[0] = sample->cpu;
2236                 if (swapped) {
2237                         /*
2238                          * Inverse of what is done in perf_evsel__parse_sample
2239                          */
2240                         u.val32[0] = bswap_32(u.val32[0]);
2241                         u.val64 = bswap_64(u.val64);
2242                 }
2243                 *array = u.val64;
2244                 array++;
2245         }
2246
2247         if (type & PERF_SAMPLE_PERIOD) {
2248                 *array = sample->period;
2249                 array++;
2250         }
2251
2252         if (type & PERF_SAMPLE_READ) {
2253                 if (read_format & PERF_FORMAT_GROUP)
2254                         *array = sample->read.group.nr;
2255                 else
2256                         *array = sample->read.one.value;
2257                 array++;
2258
2259                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2260                         *array = sample->read.time_enabled;
2261                         array++;
2262                 }
2263
2264                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2265                         *array = sample->read.time_running;
2266                         array++;
2267                 }
2268
2269                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2270                 if (read_format & PERF_FORMAT_GROUP) {
2271                         sz = sample->read.group.nr *
2272                              sizeof(struct sample_read_value);
2273                         memcpy(array, sample->read.group.values, sz);
2274                         array = (void *)array + sz;
2275                 } else {
2276                         *array = sample->read.one.id;
2277                         array++;
2278                 }
2279         }
2280
2281         if (type & PERF_SAMPLE_CALLCHAIN) {
2282                 sz = (sample->callchain->nr + 1) * sizeof(u64);
2283                 memcpy(array, sample->callchain, sz);
2284                 array = (void *)array + sz;
2285         }
2286
2287         if (type & PERF_SAMPLE_RAW) {
2288                 u.val32[0] = sample->raw_size;
2289                 if (WARN_ONCE(swapped,
2290                               "Endianness of raw data not corrected!\n")) {
2291                         /*
2292                          * Inverse of what is done in perf_evsel__parse_sample
2293                          */
2294                         u.val32[0] = bswap_32(u.val32[0]);
2295                         u.val32[1] = bswap_32(u.val32[1]);
2296                         u.val64 = bswap_64(u.val64);
2297                 }
2298                 *array = u.val64;
2299                 array = (void *)array + sizeof(u32);
2300
2301                 memcpy(array, sample->raw_data, sample->raw_size);
2302                 array = (void *)array + sample->raw_size;
2303         }
2304
2305         if (type & PERF_SAMPLE_BRANCH_STACK) {
2306                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2307                 sz += sizeof(u64);
2308                 memcpy(array, sample->branch_stack, sz);
2309                 array = (void *)array + sz;
2310         }
2311
2312         if (type & PERF_SAMPLE_REGS_USER) {
2313                 if (sample->user_regs.abi) {
2314                         *array++ = sample->user_regs.abi;
2315                         sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2316                         memcpy(array, sample->user_regs.regs, sz);
2317                         array = (void *)array + sz;
2318                 } else {
2319                         *array++ = 0;
2320                 }
2321         }
2322
2323         if (type & PERF_SAMPLE_STACK_USER) {
2324                 sz = sample->user_stack.size;
2325                 *array++ = sz;
2326                 if (sz) {
2327                         memcpy(array, sample->user_stack.data, sz);
2328                         array = (void *)array + sz;
2329                         *array++ = sz;
2330                 }
2331         }
2332
2333         if (type & PERF_SAMPLE_WEIGHT) {
2334                 *array = sample->weight;
2335                 array++;
2336         }
2337
2338         if (type & PERF_SAMPLE_DATA_SRC) {
2339                 *array = sample->data_src;
2340                 array++;
2341         }
2342
2343         if (type & PERF_SAMPLE_TRANSACTION) {
2344                 *array = sample->transaction;
2345                 array++;
2346         }
2347
2348         if (type & PERF_SAMPLE_REGS_INTR) {
2349                 if (sample->intr_regs.abi) {
2350                         *array++ = sample->intr_regs.abi;
2351                         sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2352                         memcpy(array, sample->intr_regs.regs, sz);
2353                         array = (void *)array + sz;
2354                 } else {
2355                         *array++ = 0;
2356                 }
2357         }
2358
2359         return 0;
2360 }
2361
2362 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2363 {
2364         return pevent_find_field(evsel->tp_format, name);
2365 }
2366
2367 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2368                          const char *name)
2369 {
2370         struct format_field *field = perf_evsel__field(evsel, name);
2371         int offset;
2372
2373         if (!field)
2374                 return NULL;
2375
2376         offset = field->offset;
2377
2378         if (field->flags & FIELD_IS_DYNAMIC) {
2379                 offset = *(int *)(sample->raw_data + field->offset);
2380                 offset &= 0xffff;
2381         }
2382
2383         return sample->raw_data + offset;
2384 }
2385
2386 u64 format_field__intval(struct format_field *field, struct perf_sample *sample,
2387                          bool needs_swap)
2388 {
2389         u64 value;
2390         void *ptr = sample->raw_data + field->offset;
2391
2392         switch (field->size) {
2393         case 1:
2394                 return *(u8 *)ptr;
2395         case 2:
2396                 value = *(u16 *)ptr;
2397                 break;
2398         case 4:
2399                 value = *(u32 *)ptr;
2400                 break;
2401         case 8:
2402                 memcpy(&value, ptr, sizeof(u64));
2403                 break;
2404         default:
2405                 return 0;
2406         }
2407
2408         if (!needs_swap)
2409                 return value;
2410
2411         switch (field->size) {
2412         case 2:
2413                 return bswap_16(value);
2414         case 4:
2415                 return bswap_32(value);
2416         case 8:
2417                 return bswap_64(value);
2418         default:
2419                 return 0;
2420         }
2421
2422         return 0;
2423 }
2424
2425 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2426                        const char *name)
2427 {
2428         struct format_field *field = perf_evsel__field(evsel, name);
2429
2430         if (!field)
2431                 return 0;
2432
2433         return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2434 }
2435
2436 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2437                           char *msg, size_t msgsize)
2438 {
2439         int paranoid;
2440
2441         if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2442             evsel->attr.type   == PERF_TYPE_HARDWARE &&
2443             evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2444                 /*
2445                  * If it's cycles then fall back to hrtimer based
2446                  * cpu-clock-tick sw counter, which is always available even if
2447                  * no PMU support.
2448                  *
2449                  * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2450                  * b0a873e).
2451                  */
2452                 scnprintf(msg, msgsize, "%s",
2453 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2454
2455                 evsel->attr.type   = PERF_TYPE_SOFTWARE;
2456                 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2457
2458                 zfree(&evsel->name);
2459                 return true;
2460         } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2461                    (paranoid = perf_event_paranoid()) > 1) {
2462                 const char *name = perf_evsel__name(evsel);
2463                 char *new_name;
2464
2465                 if (asprintf(&new_name, "%s%su", name, strchr(name, ':') ? "" : ":") < 0)
2466                         return false;
2467
2468                 if (evsel->name)
2469                         free(evsel->name);
2470                 evsel->name = new_name;
2471                 scnprintf(msg, msgsize,
2472 "kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2473                 evsel->attr.exclude_kernel = 1;
2474
2475                 return true;
2476         }
2477
2478         return false;
2479 }
2480
2481 static bool find_process(const char *name)
2482 {
2483         size_t len = strlen(name);
2484         DIR *dir;
2485         struct dirent *d;
2486         int ret = -1;
2487
2488         dir = opendir(procfs__mountpoint());
2489         if (!dir)
2490                 return false;
2491
2492         /* Walk through the directory. */
2493         while (ret && (d = readdir(dir)) != NULL) {
2494                 char path[PATH_MAX];
2495                 char *data;
2496                 size_t size;
2497
2498                 if ((d->d_type != DT_DIR) ||
2499                      !strcmp(".", d->d_name) ||
2500                      !strcmp("..", d->d_name))
2501                         continue;
2502
2503                 scnprintf(path, sizeof(path), "%s/%s/comm",
2504                           procfs__mountpoint(), d->d_name);
2505
2506                 if (filename__read_str(path, &data, &size))
2507                         continue;
2508
2509                 ret = strncmp(name, data, len);
2510                 free(data);
2511         }
2512
2513         closedir(dir);
2514         return ret ? false : true;
2515 }
2516
2517 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2518                               int err, char *msg, size_t size)
2519 {
2520         char sbuf[STRERR_BUFSIZE];
2521         int printed = 0;
2522
2523         switch (err) {
2524         case EPERM:
2525         case EACCES:
2526                 if (err == EPERM)
2527                         printed = scnprintf(msg, size,
2528                                 "No permission to enable %s event.\n\n",
2529                                 perf_evsel__name(evsel));
2530
2531                 return scnprintf(msg + printed, size - printed,
2532                  "You may not have permission to collect %sstats.\n\n"
2533                  "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2534                  "which controls use of the performance events system by\n"
2535                  "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2536                  "The current value is %d:\n\n"
2537                  "  -1: Allow use of (almost) all events by all users\n"
2538                  ">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
2539                  ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2540                  ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2541                  "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2542                  "      kernel.perf_event_paranoid = -1\n" ,
2543                                  target->system_wide ? "system-wide " : "",
2544                                  perf_event_paranoid());
2545         case ENOENT:
2546                 return scnprintf(msg, size, "The %s event is not supported.",
2547                                  perf_evsel__name(evsel));
2548         case EMFILE:
2549                 return scnprintf(msg, size, "%s",
2550                          "Too many events are opened.\n"
2551                          "Probably the maximum number of open file descriptors has been reached.\n"
2552                          "Hint: Try again after reducing the number of events.\n"
2553                          "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2554         case ENOMEM:
2555                 if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
2556                     access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2557                         return scnprintf(msg, size,
2558                                          "Not enough memory to setup event with callchain.\n"
2559                                          "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2560                                          "Hint: Current value: %d", sysctl_perf_event_max_stack);
2561                 break;
2562         case ENODEV:
2563                 if (target->cpu_list)
2564                         return scnprintf(msg, size, "%s",
2565          "No such device - did you specify an out-of-range profile CPU?");
2566                 break;
2567         case EOPNOTSUPP:
2568                 if (evsel->attr.sample_period != 0)
2569                         return scnprintf(msg, size, "%s",
2570         "PMU Hardware doesn't support sampling/overflow-interrupts.");
2571                 if (evsel->attr.precise_ip)
2572                         return scnprintf(msg, size, "%s",
2573         "\'precise\' request may not be supported. Try removing 'p' modifier.");
2574 #if defined(__i386__) || defined(__x86_64__)
2575                 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2576                         return scnprintf(msg, size, "%s",
2577         "No hardware sampling interrupt available.\n"
2578         "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2579 #endif
2580                 break;
2581         case EBUSY:
2582                 if (find_process("oprofiled"))
2583                         return scnprintf(msg, size,
2584         "The PMU counters are busy/taken by another profiler.\n"
2585         "We found oprofile daemon running, please stop it and try again.");
2586                 break;
2587         case EINVAL:
2588                 if (evsel->attr.write_backward && perf_missing_features.write_backward)
2589                         return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2590                 if (perf_missing_features.clockid)
2591                         return scnprintf(msg, size, "clockid feature not supported.");
2592                 if (perf_missing_features.clockid_wrong)
2593                         return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2594                 break;
2595         default:
2596                 break;
2597         }
2598
2599         return scnprintf(msg, size,
2600         "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2601         "/bin/dmesg may provide additional information.\n"
2602         "No CONFIG_PERF_EVENTS=y kernel support configured?",
2603                          err, str_error_r(err, sbuf, sizeof(sbuf)),
2604                          perf_evsel__name(evsel));
2605 }
2606
2607 char *perf_evsel__env_arch(struct perf_evsel *evsel)
2608 {
2609         if (evsel && evsel->evlist && evsel->evlist->env)
2610                 return evsel->evlist->env->arch;
2611         return NULL;
2612 }