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 <linux/bitops.h>
  12 #include <api/fs/tracing_path.h>
  13 #include <traceevent/event-parse.h>
  14 #include <linux/hw_breakpoint.h>
  15 #include <linux/perf_event.h>
  16 #include <linux/err.h>
  17 #include <sys/resource.h>
  18 #include "asm/bug.h"
  19 #include "callchain.h"
  20 #include "cgroup.h"
  21 #include "evsel.h"
  22 #include "evlist.h"
  23 #include "util.h"
  24 #include "cpumap.h"
  25 #include "thread_map.h"
  26 #include "target.h"
  27 #include "perf_regs.h"
  28 #include "debug.h"
  29 #include "trace-event.h"
  30 #include "stat.h"
  31
  32 static struct {
  33         bool sample_id_all;
  34         bool exclude_guest;
  35         bool mmap2;
  36         bool cloexec;
  37         bool clockid;
  38         bool clockid_wrong;
  39 } perf_missing_features;
  40
  41 static clockid_t clockid;
  42
  43 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
  44 {
  45         return 0;
  46 }
  47
  48 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
  49 {
  50 }
  51
  52 static struct {
  53         size_t  size;
  54         int     (*init)(struct perf_evsel *evsel);
  55         void    (*fini)(struct perf_evsel *evsel);
  56 } perf_evsel__object = {
  57         .size = sizeof(struct perf_evsel),
  58         .init = perf_evsel__no_extra_init,
  59         .fini = perf_evsel__no_extra_fini,
  60 };
  61
  62 int perf_evsel__object_config(size_t object_size,
  63                               int (*init)(struct perf_evsel *evsel),
  64                               void (*fini)(struct perf_evsel *evsel))
  65 {
  66
  67         if (object_size == 0)
  68                 goto set_methods;
  69
  70         if (perf_evsel__object.size > object_size)
  71                 return -EINVAL;
  72
  73         perf_evsel__object.size = object_size;
  74
  75 set_methods:
  76         if (init != NULL)
  77                 perf_evsel__object.init = init;
  78
  79         if (fini != NULL)
  80                 perf_evsel__object.fini = fini;
  81
  82         return 0;
  83 }
  84
  85 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  86
  87 int __perf_evsel__sample_size(u64 sample_type)
  88 {
  89         u64 mask = sample_type & PERF_SAMPLE_MASK;
  90         int size = 0;
  91         int i;
  92
  93         for (i = 0; i < 64; i++) {
  94                 if (mask & (1ULL << i))
  95                         size++;
  96         }
  97
  98         size *= sizeof(u64);
  99
 100         return size;
 101 }
 102
 103 /**
 104  * __perf_evsel__calc_id_pos - calculate id_pos.
 105  * @sample_type: sample type
 106  *
 107  * This function returns the position of the event id (PERF_SAMPLE_ID or
 108  * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
 109  * sample_event.
 110  */
 111 static int __perf_evsel__calc_id_pos(u64 sample_type)
 112 {
 113         int idx = 0;
 114
 115         if (sample_type & PERF_SAMPLE_IDENTIFIER)
 116                 return 0;
 117
 118         if (!(sample_type & PERF_SAMPLE_ID))
 119                 return -1;
 120
 121         if (sample_type & PERF_SAMPLE_IP)
 122                 idx += 1;
 123
 124         if (sample_type & PERF_SAMPLE_TID)
 125                 idx += 1;
 126
 127         if (sample_type & PERF_SAMPLE_TIME)
 128                 idx += 1;
 129
 130         if (sample_type & PERF_SAMPLE_ADDR)
 131                 idx += 1;
 132
 133         return idx;
 134 }
 135
 136 /**
 137  * __perf_evsel__calc_is_pos - calculate is_pos.
 138  * @sample_type: sample type
 139  *
 140  * This function returns the position (counting backwards) of the event id
 141  * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
 142  * sample_id_all is used there is an id sample appended to non-sample events.
 143  */
 144 static int __perf_evsel__calc_is_pos(u64 sample_type)
 145 {
 146         int idx = 1;
 147
 148         if (sample_type & PERF_SAMPLE_IDENTIFIER)
 149                 return 1;
 150
 151         if (!(sample_type & PERF_SAMPLE_ID))
 152                 return -1;
 153
 154         if (sample_type & PERF_SAMPLE_CPU)
 155                 idx += 1;
 156
 157         if (sample_type & PERF_SAMPLE_STREAM_ID)
 158                 idx += 1;
 159
 160         return idx;
 161 }
 162
 163 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
 164 {
 165         evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
 166         evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
 167 }
 168
 169 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
 170                                   enum perf_event_sample_format bit)
 171 {
 172         if (!(evsel->attr.sample_type & bit)) {
 173                 evsel->attr.sample_type |= bit;
 174                 evsel->sample_size += sizeof(u64);
 175                 perf_evsel__calc_id_pos(evsel);
 176         }
 177 }
 178
 179 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
 180                                     enum perf_event_sample_format bit)
 181 {
 182         if (evsel->attr.sample_type & bit) {
 183                 evsel->attr.sample_type &= ~bit;
 184                 evsel->sample_size -= sizeof(u64);
 185                 perf_evsel__calc_id_pos(evsel);
 186         }
 187 }
 188
 189 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
 190                                bool can_sample_identifier)
 191 {
 192         if (can_sample_identifier) {
 193                 perf_evsel__reset_sample_bit(evsel, ID);
 194                 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
 195         } else {
 196                 perf_evsel__set_sample_bit(evsel, ID);
 197         }
 198         evsel->attr.read_format |= PERF_FORMAT_ID;
 199 }
 200
 201 void perf_evsel__init(struct perf_evsel *evsel,
 202                       struct perf_event_attr *attr, int idx)
 203 {
 204         evsel->idx         = idx;
 205         evsel->tracking    = !idx;
 206         evsel->attr        = *attr;
 207         evsel->leader      = evsel;
 208         evsel->unit        = "";
 209         evsel->scale       = 1.0;
 210         evsel->evlist      = NULL;
 211         INIT_LIST_HEAD(&evsel->node);
 212         INIT_LIST_HEAD(&evsel->config_terms);
 213         perf_evsel__object.init(evsel);
 214         evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
 215         perf_evsel__calc_id_pos(evsel);
 216         evsel->cmdline_group_boundary = false;
 217 }
 218
 219 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
 220 {
 221         struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
 222
 223         if (evsel != NULL)
 224                 perf_evsel__init(evsel, attr, idx);
 225
 226         return evsel;
 227 }
 228
 229 /*
 230  * Returns pointer with encoded error via <linux/err.h> interface.
 231  */
 232 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
 233 {
 234         struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
 235         int err = -ENOMEM;
 236
 237         if (evsel == NULL) {
 238                 goto out_err;
 239         } else {
 240                 struct perf_event_attr attr = {
 241                         .type          = PERF_TYPE_TRACEPOINT,
 242                         .sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 243                                           PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 244                 };
 245
 246                 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
 247                         goto out_free;
 248
 249                 evsel->tp_format = trace_event__tp_format(sys, name);
 250                 if (IS_ERR(evsel->tp_format)) {
 251                         err = PTR_ERR(evsel->tp_format);
 252                         goto out_free;
 253                 }
 254
 255                 event_attr_init(&attr);
 256                 attr.config = evsel->tp_format->id;
 257                 attr.sample_period = 1;
 258                 perf_evsel__init(evsel, &attr, idx);
 259         }
 260
 261         return evsel;
 262
 263 out_free:
 264         zfree(&evsel->name);
 265         free(evsel);
 266 out_err:
 267         return ERR_PTR(err);
 268 }
 269
 270 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
 271         "cycles",
 272         "instructions",
 273         "cache-references",
 274         "cache-misses",
 275         "branches",
 276         "branch-misses",
 277         "bus-cycles",
 278         "stalled-cycles-frontend",
 279         "stalled-cycles-backend",
 280         "ref-cycles",
 281 };
 282
 283 static const char *__perf_evsel__hw_name(u64 config)
 284 {
 285         if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
 286                 return perf_evsel__hw_names[config];
 287
 288         return "unknown-hardware";
 289 }
 290
 291 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
 292 {
 293         int colon = 0, r = 0;
 294         struct perf_event_attr *attr = &evsel->attr;
 295         bool exclude_guest_default = false;
 296
 297 #define MOD_PRINT(context, mod) do {                                    \
 298                 if (!attr->exclude_##context) {                         \
 299                         if (!colon) colon = ++r;                        \
 300                         r += scnprintf(bf + r, size - r, "%c", mod);    \
 301                 } } while(0)
 302
 303         if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
 304                 MOD_PRINT(kernel, 'k');
 305                 MOD_PRINT(user, 'u');
 306                 MOD_PRINT(hv, 'h');
 307                 exclude_guest_default = true;
 308         }
 309
 310         if (attr->precise_ip) {
 311                 if (!colon)
 312                         colon = ++r;
 313                 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
 314                 exclude_guest_default = true;
 315         }
 316
 317         if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
 318                 MOD_PRINT(host, 'H');
 319                 MOD_PRINT(guest, 'G');
 320         }
 321 #undef MOD_PRINT
 322         if (colon)
 323                 bf[colon - 1] = ':';
 324         return r;
 325 }
 326
 327 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
 328 {
 329         int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
 330         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 331 }
 332
 333 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
 334         "cpu-clock",
 335         "task-clock",
 336         "page-faults",
 337         "context-switches",
 338         "cpu-migrations",
 339         "minor-faults",
 340         "major-faults",
 341         "alignment-faults",
 342         "emulation-faults",
 343         "dummy",
 344 };
 345
 346 static const char *__perf_evsel__sw_name(u64 config)
 347 {
 348         if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
 349                 return perf_evsel__sw_names[config];
 350         return "unknown-software";
 351 }
 352
 353 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
 354 {
 355         int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
 356         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 357 }
 358
 359 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
 360 {
 361         int r;
 362
 363         r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
 364
 365         if (type & HW_BREAKPOINT_R)
 366                 r += scnprintf(bf + r, size - r, "r");
 367
 368         if (type & HW_BREAKPOINT_W)
 369                 r += scnprintf(bf + r, size - r, "w");
 370
 371         if (type & HW_BREAKPOINT_X)
 372                 r += scnprintf(bf + r, size - r, "x");
 373
 374         return r;
 375 }
 376
 377 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
 378 {
 379         struct perf_event_attr *attr = &evsel->attr;
 380         int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
 381         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 382 }
 383
 384 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
 385                                 [PERF_EVSEL__MAX_ALIASES] = {
 386  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
 387  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
 388  { "LLC",       "L2",                                                   },
 389  { "dTLB",      "d-tlb",        "Data-TLB",                             },
 390  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
 391  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
 392  { "node",                                                              },
 393 };
 394
 395 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
 396                                    [PERF_EVSEL__MAX_ALIASES] = {
 397  { "load",      "loads",        "read",                                 },
 398  { "store",     "stores",       "write",                                },
 399  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
 400 };
 401
 402 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
 403                                        [PERF_EVSEL__MAX_ALIASES] = {
 404  { "refs",      "Reference",    "ops",          "access",               },
 405  { "misses",    "miss",                                                 },
 406 };
 407
 408 #define C(x)            PERF_COUNT_HW_CACHE_##x
 409 #define CACHE_READ      (1 << C(OP_READ))
 410 #define CACHE_WRITE     (1 << C(OP_WRITE))
 411 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
 412 #define COP(x)          (1 << x)
 413
 414 /*
 415  * cache operartion stat
 416  * L1I : Read and prefetch only
 417  * ITLB and BPU : Read-only
 418  */
 419 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
 420  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 421  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
 422  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 423  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 424  [C(ITLB)]      = (CACHE_READ),
 425  [C(BPU)]       = (CACHE_READ),
 426  [C(NODE)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 427 };
 428
 429 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
 430 {
 431         if (perf_evsel__hw_cache_stat[type] & COP(op))
 432                 return true;    /* valid */
 433         else
 434                 return false;   /* invalid */
 435 }
 436
 437 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
 438                                             char *bf, size_t size)
 439 {
 440         if (result) {
 441                 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
 442                                  perf_evsel__hw_cache_op[op][0],
 443                                  perf_evsel__hw_cache_result[result][0]);
 444         }
 445
 446         return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
 447                          perf_evsel__hw_cache_op[op][1]);
 448 }
 449
 450 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
 451 {
 452         u8 op, result, type = (config >>  0) & 0xff;
 453         const char *err = "unknown-ext-hardware-cache-type";
 454
 455         if (type > PERF_COUNT_HW_CACHE_MAX)
 456                 goto out_err;
 457
 458         op = (config >>  8) & 0xff;
 459         err = "unknown-ext-hardware-cache-op";
 460         if (op > PERF_COUNT_HW_CACHE_OP_MAX)
 461                 goto out_err;
 462
 463         result = (config >> 16) & 0xff;
 464         err = "unknown-ext-hardware-cache-result";
 465         if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
 466                 goto out_err;
 467
 468         err = "invalid-cache";
 469         if (!perf_evsel__is_cache_op_valid(type, op))
 470                 goto out_err;
 471
 472         return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
 473 out_err:
 474         return scnprintf(bf, size, "%s", err);
 475 }
 476
 477 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
 478 {
 479         int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
 480         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 481 }
 482
 483 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
 484 {
 485         int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
 486         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 487 }
 488
 489 const char *perf_evsel__name(struct perf_evsel *evsel)
 490 {
 491         char bf[128];
 492
 493         if (evsel->name)
 494                 return evsel->name;
 495
 496         switch (evsel->attr.type) {
 497         case PERF_TYPE_RAW:
 498                 perf_evsel__raw_name(evsel, bf, sizeof(bf));
 499                 break;
 500
 501         case PERF_TYPE_HARDWARE:
 502                 perf_evsel__hw_name(evsel, bf, sizeof(bf));
 503                 break;
 504
 505         case PERF_TYPE_HW_CACHE:
 506                 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
 507                 break;
 508
 509         case PERF_TYPE_SOFTWARE:
 510                 perf_evsel__sw_name(evsel, bf, sizeof(bf));
 511                 break;
 512
 513         case PERF_TYPE_TRACEPOINT:
 514                 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
 515                 break;
 516
 517         case PERF_TYPE_BREAKPOINT:
 518                 perf_evsel__bp_name(evsel, bf, sizeof(bf));
 519                 break;
 520
 521         default:
 522                 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
 523                           evsel->attr.type);
 524                 break;
 525         }
 526
 527         evsel->name = strdup(bf);
 528
 529         return evsel->name ?: "unknown";
 530 }
 531
 532 const char *perf_evsel__group_name(struct perf_evsel *evsel)
 533 {
 534         return evsel->group_name ?: "anon group";
 535 }
 536
 537 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
 538 {
 539         int ret;
 540         struct perf_evsel *pos;
 541         const char *group_name = perf_evsel__group_name(evsel);
 542
 543         ret = scnprintf(buf, size, "%s", group_name);
 544
 545         ret += scnprintf(buf + ret, size - ret, " { %s",
 546                          perf_evsel__name(evsel));
 547
 548         for_each_group_member(pos, evsel)
 549                 ret += scnprintf(buf + ret, size - ret, ", %s",
 550                                  perf_evsel__name(pos));
 551
 552         ret += scnprintf(buf + ret, size - ret, " }");
 553
 554         return ret;
 555 }
 556
 557 static void
 558 perf_evsel__config_callgraph(struct perf_evsel *evsel,
 559                              struct record_opts *opts,
 560                              struct callchain_param *param)
 561 {
 562         bool function = perf_evsel__is_function_event(evsel);
 563         struct perf_event_attr *attr = &evsel->attr;
 564
 565         perf_evsel__set_sample_bit(evsel, CALLCHAIN);
 566
 567         if (param->record_mode == CALLCHAIN_LBR) {
 568                 if (!opts->branch_stack) {
 569                         if (attr->exclude_user) {
 570                                 pr_warning("LBR callstack option is only available "
 571                                            "to get user callchain information. "
 572                                            "Falling back to framepointers.\n");
 573                         } else {
 574                                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 575                                 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
 576                                                         PERF_SAMPLE_BRANCH_CALL_STACK;
 577                         }
 578                 } else
 579                          pr_warning("Cannot use LBR callstack with branch stack. "
 580                                     "Falling back to framepointers.\n");
 581         }
 582
 583         if (param->record_mode == CALLCHAIN_DWARF) {
 584                 if (!function) {
 585                         perf_evsel__set_sample_bit(evsel, REGS_USER);
 586                         perf_evsel__set_sample_bit(evsel, STACK_USER);
 587                         attr->sample_regs_user = PERF_REGS_MASK;
 588                         attr->sample_stack_user = param->dump_size;
 589                         attr->exclude_callchain_user = 1;
 590                 } else {
 591                         pr_info("Cannot use DWARF unwind for function trace event,"
 592                                 " falling back to framepointers.\n");
 593                 }
 594         }
 595
 596         if (function) {
 597                 pr_info("Disabling user space callchains for function trace event.\n");
 598                 attr->exclude_callchain_user = 1;
 599         }
 600 }
 601
 602 static void
 603 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
 604                             struct callchain_param *param)
 605 {
 606         struct perf_event_attr *attr = &evsel->attr;
 607
 608         perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
 609         if (param->record_mode == CALLCHAIN_LBR) {
 610                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 611                 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
 612                                               PERF_SAMPLE_BRANCH_CALL_STACK);
 613         }
 614         if (param->record_mode == CALLCHAIN_DWARF) {
 615                 perf_evsel__reset_sample_bit(evsel, REGS_USER);
 616                 perf_evsel__reset_sample_bit(evsel, STACK_USER);
 617         }
 618 }
 619
 620 static void apply_config_terms(struct perf_evsel *evsel,
 621                                struct record_opts *opts)
 622 {
 623         struct perf_evsel_config_term *term;
 624         struct list_head *config_terms = &evsel->config_terms;
 625         struct perf_event_attr *attr = &evsel->attr;
 626         struct callchain_param param;
 627         u32 dump_size = 0;
 628         char *callgraph_buf = NULL;
 629
 630         /* callgraph default */
 631         param.record_mode = callchain_param.record_mode;
 632
 633         list_for_each_entry(term, config_terms, list) {
 634                 switch (term->type) {
 635                 case PERF_EVSEL__CONFIG_TERM_PERIOD:
 636                         attr->sample_period = term->val.period;
 637                         attr->freq = 0;
 638                         break;
 639                 case PERF_EVSEL__CONFIG_TERM_FREQ:
 640                         attr->sample_freq = term->val.freq;
 641                         attr->freq = 1;
 642                         break;
 643                 case PERF_EVSEL__CONFIG_TERM_TIME:
 644                         if (term->val.time)
 645                                 perf_evsel__set_sample_bit(evsel, TIME);
 646                         else
 647                                 perf_evsel__reset_sample_bit(evsel, TIME);
 648                         break;
 649                 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
 650                         callgraph_buf = term->val.callgraph;
 651                         break;
 652                 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
 653                         dump_size = term->val.stack_user;
 654                         break;
 655                 default:
 656                         break;
 657                 }
 658         }
 659
 660         /* User explicitly set per-event callgraph, clear the old setting and reset. */
 661         if ((callgraph_buf != NULL) || (dump_size > 0)) {
 662
 663                 /* parse callgraph parameters */
 664                 if (callgraph_buf != NULL) {
 665                         if (!strcmp(callgraph_buf, "no")) {
 666                                 param.enabled = false;
 667                                 param.record_mode = CALLCHAIN_NONE;
 668                         } else {
 669                                 param.enabled = true;
 670                                 if (parse_callchain_record(callgraph_buf, &param)) {
 671                                         pr_err("per-event callgraph setting for %s failed. "
 672                                                "Apply callgraph global setting for it\n",
 673                                                evsel->name);
 674                                         return;
 675                                 }
 676                         }
 677                 }
 678                 if (dump_size > 0) {
 679                         dump_size = round_up(dump_size, sizeof(u64));
 680                         param.dump_size = dump_size;
 681                 }
 682
 683                 /* If global callgraph set, clear it */
 684                 if (callchain_param.enabled)
 685                         perf_evsel__reset_callgraph(evsel, &callchain_param);
 686
 687                 /* set perf-event callgraph */
 688                 if (param.enabled)
 689                         perf_evsel__config_callgraph(evsel, opts, &param);
 690         }
 691 }
 692
 693 /*
 694  * The enable_on_exec/disabled value strategy:
 695  *
 696  *  1) For any type of traced program:
 697  *    - all independent events and group leaders are disabled
 698  *    - all group members are enabled
 699  *
 700  *     Group members are ruled by group leaders. They need to
 701  *     be enabled, because the group scheduling relies on that.
 702  *
 703  *  2) For traced programs executed by perf:
 704  *     - all independent events and group leaders have
 705  *       enable_on_exec set
 706  *     - we don't specifically enable or disable any event during
 707  *       the record command
 708  *
 709  *     Independent events and group leaders are initially disabled
 710  *     and get enabled by exec. Group members are ruled by group
 711  *     leaders as stated in 1).
 712  *
 713  *  3) For traced programs attached by perf (pid/tid):
 714  *     - we specifically enable or disable all events during
 715  *       the record command
 716  *
 717  *     When attaching events to already running traced we
 718  *     enable/disable events specifically, as there's no
 719  *     initial traced exec call.
 720  */
 721 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
 722 {
 723         struct perf_evsel *leader = evsel->leader;
 724         struct perf_event_attr *attr = &evsel->attr;
 725         int track = evsel->tracking;
 726         bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
 727
 728         attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
 729         attr->inherit       = !opts->no_inherit;
 730
 731         perf_evsel__set_sample_bit(evsel, IP);
 732         perf_evsel__set_sample_bit(evsel, TID);
 733
 734         if (evsel->sample_read) {
 735                 perf_evsel__set_sample_bit(evsel, READ);
 736
 737                 /*
 738                  * We need ID even in case of single event, because
 739                  * PERF_SAMPLE_READ process ID specific data.
 740                  */
 741                 perf_evsel__set_sample_id(evsel, false);
 742
 743                 /*
 744                  * Apply group format only if we belong to group
 745                  * with more than one members.
 746                  */
 747                 if (leader->nr_members > 1) {
 748                         attr->read_format |= PERF_FORMAT_GROUP;
 749                         attr->inherit = 0;
 750                 }
 751         }
 752
 753         /*
 754          * We default some events to have a default interval. But keep
 755          * it a weak assumption overridable by the user.
 756          */
 757         if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
 758                                      opts->user_interval != ULLONG_MAX)) {
 759                 if (opts->freq) {
 760                         perf_evsel__set_sample_bit(evsel, PERIOD);
 761                         attr->freq              = 1;
 762                         attr->sample_freq       = opts->freq;
 763                 } else {
 764                         attr->sample_period = opts->default_interval;
 765                 }
 766         }
 767
 768         /*
 769          * Disable sampling for all group members other
 770          * than leader in case leader 'leads' the sampling.
 771          */
 772         if ((leader != evsel) && leader->sample_read) {
 773                 attr->sample_freq   = 0;
 774                 attr->sample_period = 0;
 775         }
 776
 777         if (opts->no_samples)
 778                 attr->sample_freq = 0;
 779
 780         if (opts->inherit_stat)
 781                 attr->inherit_stat = 1;
 782
 783         if (opts->sample_address) {
 784                 perf_evsel__set_sample_bit(evsel, ADDR);
 785                 attr->mmap_data = track;
 786         }
 787
 788         /*
 789          * We don't allow user space callchains for  function trace
 790          * event, due to issues with page faults while tracing page
 791          * fault handler and its overall trickiness nature.
 792          */
 793         if (perf_evsel__is_function_event(evsel))
 794                 evsel->attr.exclude_callchain_user = 1;
 795
 796         if (callchain_param.enabled && !evsel->no_aux_samples)
 797                 perf_evsel__config_callgraph(evsel, opts, &callchain_param);
 798
 799         if (opts->sample_intr_regs) {
 800                 attr->sample_regs_intr = opts->sample_intr_regs;
 801                 perf_evsel__set_sample_bit(evsel, REGS_INTR);
 802         }
 803
 804         if (target__has_cpu(&opts->target))
 805                 perf_evsel__set_sample_bit(evsel, CPU);
 806
 807         if (opts->period)
 808                 perf_evsel__set_sample_bit(evsel, PERIOD);
 809
 810         /*
 811          * When the user explicitely disabled time don't force it here.
 812          */
 813         if (opts->sample_time &&
 814             (!perf_missing_features.sample_id_all &&
 815             (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
 816              opts->sample_time_set)))
 817                 perf_evsel__set_sample_bit(evsel, TIME);
 818
 819         if (opts->raw_samples && !evsel->no_aux_samples) {
 820                 perf_evsel__set_sample_bit(evsel, TIME);
 821                 perf_evsel__set_sample_bit(evsel, RAW);
 822                 perf_evsel__set_sample_bit(evsel, CPU);
 823         }
 824
 825         if (opts->sample_address)
 826                 perf_evsel__set_sample_bit(evsel, DATA_SRC);
 827
 828         if (opts->no_buffering) {
 829                 attr->watermark = 0;
 830                 attr->wakeup_events = 1;
 831         }
 832         if (opts->branch_stack && !evsel->no_aux_samples) {
 833                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 834                 attr->branch_sample_type = opts->branch_stack;
 835         }
 836
 837         if (opts->sample_weight)
 838                 perf_evsel__set_sample_bit(evsel, WEIGHT);
 839
 840         attr->task  = track;
 841         attr->mmap  = track;
 842         attr->mmap2 = track && !perf_missing_features.mmap2;
 843         attr->comm  = track;
 844
 845         if (opts->record_switch_events)
 846                 attr->context_switch = track;
 847
 848         if (opts->sample_transaction)
 849                 perf_evsel__set_sample_bit(evsel, TRANSACTION);
 850
 851         if (opts->running_time) {
 852                 evsel->attr.read_format |=
 853                         PERF_FORMAT_TOTAL_TIME_ENABLED |
 854                         PERF_FORMAT_TOTAL_TIME_RUNNING;
 855         }
 856
 857         /*
 858          * XXX see the function comment above
 859          *
 860          * Disabling only independent events or group leaders,
 861          * keeping group members enabled.
 862          */
 863         if (perf_evsel__is_group_leader(evsel))
 864                 attr->disabled = 1;
 865
 866         /*
 867          * Setting enable_on_exec for independent events and
 868          * group leaders for traced executed by perf.
 869          */
 870         if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
 871                 !opts->initial_delay)
 872                 attr->enable_on_exec = 1;
 873
 874         if (evsel->immediate) {
 875                 attr->disabled = 0;
 876                 attr->enable_on_exec = 0;
 877         }
 878
 879         clockid = opts->clockid;
 880         if (opts->use_clockid) {
 881                 attr->use_clockid = 1;
 882                 attr->clockid = opts->clockid;
 883         }
 884
 885         /*
 886          * Apply event specific term settings,
 887          * it overloads any global configuration.
 888          */
 889         apply_config_terms(evsel, opts);
 890 }
 891
 892 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
 893 {
 894         int cpu, thread;
 895
 896         if (evsel->system_wide)
 897                 nthreads = 1;
 898
 899         evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
 900
 901         if (evsel->fd) {
 902                 for (cpu = 0; cpu < ncpus; cpu++) {
 903                         for (thread = 0; thread < nthreads; thread++) {
 904                                 FD(evsel, cpu, thread) = -1;
 905                         }
 906                 }
 907         }
 908
 909         return evsel->fd != NULL ? 0 : -ENOMEM;
 910 }
 911
 912 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
 913                           int ioc,  void *arg)
 914 {
 915         int cpu, thread;
 916
 917         if (evsel->system_wide)
 918                 nthreads = 1;
 919
 920         for (cpu = 0; cpu < ncpus; cpu++) {
 921                 for (thread = 0; thread < nthreads; thread++) {
 922                         int fd = FD(evsel, cpu, thread),
 923                             err = ioctl(fd, ioc, arg);
 924
 925                         if (err)
 926                                 return err;
 927                 }
 928         }
 929
 930         return 0;
 931 }
 932
 933 int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
 934                              const char *filter)
 935 {
 936         return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
 937                                      PERF_EVENT_IOC_SET_FILTER,
 938                                      (void *)filter);
 939 }
 940
 941 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
 942 {
 943         char *new_filter = strdup(filter);
 944
 945         if (new_filter != NULL) {
 946                 free(evsel->filter);
 947                 evsel->filter = new_filter;
 948                 return 0;
 949         }
 950
 951         return -1;
 952 }
 953
 954 int perf_evsel__append_filter(struct perf_evsel *evsel,
 955                               const char *op, const char *filter)
 956 {
 957         char *new_filter;
 958
 959         if (evsel->filter == NULL)
 960                 return perf_evsel__set_filter(evsel, filter);
 961
 962         if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
 963                 free(evsel->filter);
 964                 evsel->filter = new_filter;
 965                 return 0;
 966         }
 967
 968         return -1;
 969 }
 970
 971 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
 972 {
 973         return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
 974                                      PERF_EVENT_IOC_ENABLE,
 975                                      0);
 976 }
 977
 978 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
 979 {
 980         if (ncpus == 0 || nthreads == 0)
 981                 return 0;
 982
 983         if (evsel->system_wide)
 984                 nthreads = 1;
 985
 986         evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
 987         if (evsel->sample_id == NULL)
 988                 return -ENOMEM;
 989
 990         evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
 991         if (evsel->id == NULL) {
 992                 xyarray__delete(evsel->sample_id);
 993                 evsel->sample_id = NULL;
 994                 return -ENOMEM;
 995         }
 996
 997         return 0;
 998 }
 999
1000 static void perf_evsel__free_fd(struct perf_evsel *evsel)
1001 {
1002         xyarray__delete(evsel->fd);
1003         evsel->fd = NULL;
1004 }
1005
1006 static void perf_evsel__free_id(struct perf_evsel *evsel)
1007 {
1008         xyarray__delete(evsel->sample_id);
1009         evsel->sample_id = NULL;
1010         zfree(&evsel->id);
1011 }
1012
1013 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1014 {
1015         struct perf_evsel_config_term *term, *h;
1016
1017         list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1018                 list_del(&term->list);
1019                 free(term);
1020         }
1021 }
1022
1023 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1024 {
1025         int cpu, thread;
1026
1027         if (evsel->system_wide)
1028                 nthreads = 1;
1029
1030         for (cpu = 0; cpu < ncpus; cpu++)
1031                 for (thread = 0; thread < nthreads; ++thread) {
1032                         close(FD(evsel, cpu, thread));
1033                         FD(evsel, cpu, thread) = -1;
1034                 }
1035 }
1036
1037 void perf_evsel__exit(struct perf_evsel *evsel)
1038 {
1039         assert(list_empty(&evsel->node));
1040         assert(evsel->evlist == NULL);
1041         perf_evsel__free_fd(evsel);
1042         perf_evsel__free_id(evsel);
1043         perf_evsel__free_config_terms(evsel);
1044         close_cgroup(evsel->cgrp);
1045         cpu_map__put(evsel->cpus);
1046         cpu_map__put(evsel->own_cpus);
1047         thread_map__put(evsel->threads);
1048         zfree(&evsel->group_name);
1049         zfree(&evsel->name);
1050         perf_evsel__object.fini(evsel);
1051 }
1052
1053 void perf_evsel__delete(struct perf_evsel *evsel)
1054 {
1055         perf_evsel__exit(evsel);
1056         free(evsel);
1057 }
1058
1059 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1060                                 struct perf_counts_values *count)
1061 {
1062         struct perf_counts_values tmp;
1063
1064         if (!evsel->prev_raw_counts)
1065                 return;
1066
1067         if (cpu == -1) {
1068                 tmp = evsel->prev_raw_counts->aggr;
1069                 evsel->prev_raw_counts->aggr = *count;
1070         } else {
1071                 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1072                 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1073         }
1074
1075         count->val = count->val - tmp.val;
1076         count->ena = count->ena - tmp.ena;
1077         count->run = count->run - tmp.run;
1078 }
1079
1080 void perf_counts_values__scale(struct perf_counts_values *count,
1081                                bool scale, s8 *pscaled)
1082 {
1083         s8 scaled = 0;
1084
1085         if (scale) {
1086                 if (count->run == 0) {
1087                         scaled = -1;
1088                         count->val = 0;
1089                 } else if (count->run < count->ena) {
1090                         scaled = 1;
1091                         count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1092                 }
1093         } else
1094                 count->ena = count->run = 0;
1095
1096         if (pscaled)
1097                 *pscaled = scaled;
1098 }
1099
1100 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1101                      struct perf_counts_values *count)
1102 {
1103         memset(count, 0, sizeof(*count));
1104
1105         if (FD(evsel, cpu, thread) < 0)
1106                 return -EINVAL;
1107
1108         if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
1109                 return -errno;
1110
1111         return 0;
1112 }
1113
1114 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1115                               int cpu, int thread, bool scale)
1116 {
1117         struct perf_counts_values count;
1118         size_t nv = scale ? 3 : 1;
1119
1120         if (FD(evsel, cpu, thread) < 0)
1121                 return -EINVAL;
1122
1123         if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1124                 return -ENOMEM;
1125
1126         if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
1127                 return -errno;
1128
1129         perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1130         perf_counts_values__scale(&count, scale, NULL);
1131         *perf_counts(evsel->counts, cpu, thread) = count;
1132         return 0;
1133 }
1134
1135 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1136 {
1137         struct perf_evsel *leader = evsel->leader;
1138         int fd;
1139
1140         if (perf_evsel__is_group_leader(evsel))
1141                 return -1;
1142
1143         /*
1144          * Leader must be already processed/open,
1145          * if not it's a bug.
1146          */
1147         BUG_ON(!leader->fd);
1148
1149         fd = FD(leader, cpu, thread);
1150         BUG_ON(fd == -1);
1151
1152         return fd;
1153 }
1154
1155 struct bit_names {
1156         int bit;
1157         const char *name;
1158 };
1159
1160 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1161 {
1162         bool first_bit = true;
1163         int i = 0;
1164
1165         do {
1166                 if (value & bits[i].bit) {
1167                         buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1168                         first_bit = false;
1169                 }
1170         } while (bits[++i].name != NULL);
1171 }
1172
1173 static void __p_sample_type(char *buf, size_t size, u64 value)
1174 {
1175 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1176         struct bit_names bits[] = {
1177                 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1178                 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1179                 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1180                 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1181                 bit_name(IDENTIFIER), bit_name(REGS_INTR),
1182                 { .name = NULL, }
1183         };
1184 #undef bit_name
1185         __p_bits(buf, size, value, bits);
1186 }
1187
1188 static void __p_read_format(char *buf, size_t size, u64 value)
1189 {
1190 #define bit_name(n) { PERF_FORMAT_##n, #n }
1191         struct bit_names bits[] = {
1192                 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1193                 bit_name(ID), bit_name(GROUP),
1194                 { .name = NULL, }
1195         };
1196 #undef bit_name
1197         __p_bits(buf, size, value, bits);
1198 }
1199
1200 #define BUF_SIZE                1024
1201
1202 #define p_hex(val)              snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1203 #define p_unsigned(val)         snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1204 #define p_signed(val)           snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1205 #define p_sample_type(val)      __p_sample_type(buf, BUF_SIZE, val)
1206 #define p_read_format(val)      __p_read_format(buf, BUF_SIZE, val)
1207
1208 #define PRINT_ATTRn(_n, _f, _p)                         \
1209 do {                                                    \
1210         if (attr->_f) {                                 \
1211                 _p(attr->_f);                           \
1212                 ret += attr__fprintf(fp, _n, buf, priv);\
1213         }                                               \
1214 } while (0)
1215
1216 #define PRINT_ATTRf(_f, _p)     PRINT_ATTRn(#_f, _f, _p)
1217
1218 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1219                              attr__fprintf_f attr__fprintf, void *priv)
1220 {
1221         char buf[BUF_SIZE];
1222         int ret = 0;
1223
1224         PRINT_ATTRf(type, p_unsigned);
1225         PRINT_ATTRf(size, p_unsigned);
1226         PRINT_ATTRf(config, p_hex);
1227         PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1228         PRINT_ATTRf(sample_type, p_sample_type);
1229         PRINT_ATTRf(read_format, p_read_format);
1230
1231         PRINT_ATTRf(disabled, p_unsigned);
1232         PRINT_ATTRf(inherit, p_unsigned);
1233         PRINT_ATTRf(pinned, p_unsigned);
1234         PRINT_ATTRf(exclusive, p_unsigned);
1235         PRINT_ATTRf(exclude_user, p_unsigned);
1236         PRINT_ATTRf(exclude_kernel, p_unsigned);
1237         PRINT_ATTRf(exclude_hv, p_unsigned);
1238         PRINT_ATTRf(exclude_idle, p_unsigned);
1239         PRINT_ATTRf(mmap, p_unsigned);
1240         PRINT_ATTRf(comm, p_unsigned);
1241         PRINT_ATTRf(freq, p_unsigned);
1242         PRINT_ATTRf(inherit_stat, p_unsigned);
1243         PRINT_ATTRf(enable_on_exec, p_unsigned);
1244         PRINT_ATTRf(task, p_unsigned);
1245         PRINT_ATTRf(watermark, p_unsigned);
1246         PRINT_ATTRf(precise_ip, p_unsigned);
1247         PRINT_ATTRf(mmap_data, p_unsigned);
1248         PRINT_ATTRf(sample_id_all, p_unsigned);
1249         PRINT_ATTRf(exclude_host, p_unsigned);
1250         PRINT_ATTRf(exclude_guest, p_unsigned);
1251         PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1252         PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1253         PRINT_ATTRf(mmap2, p_unsigned);
1254         PRINT_ATTRf(comm_exec, p_unsigned);
1255         PRINT_ATTRf(use_clockid, p_unsigned);
1256         PRINT_ATTRf(context_switch, p_unsigned);
1257
1258         PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1259         PRINT_ATTRf(bp_type, p_unsigned);
1260         PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1261         PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1262         PRINT_ATTRf(sample_regs_user, p_hex);
1263         PRINT_ATTRf(sample_stack_user, p_unsigned);
1264         PRINT_ATTRf(clockid, p_signed);
1265         PRINT_ATTRf(sample_regs_intr, p_hex);
1266         PRINT_ATTRf(aux_watermark, p_unsigned);
1267
1268         return ret;
1269 }
1270
1271 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1272                                 void *priv __attribute__((unused)))
1273 {
1274         return fprintf(fp, "  %-32s %s\n", name, val);
1275 }
1276
1277 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1278                               struct thread_map *threads)
1279 {
1280         int cpu, thread, nthreads;
1281         unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1282         int pid = -1, err;
1283         enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1284
1285         if (evsel->system_wide)
1286                 nthreads = 1;
1287         else
1288                 nthreads = threads->nr;
1289
1290         if (evsel->fd == NULL &&
1291             perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1292                 return -ENOMEM;
1293
1294         if (evsel->cgrp) {
1295                 flags |= PERF_FLAG_PID_CGROUP;
1296                 pid = evsel->cgrp->fd;
1297         }
1298
1299 fallback_missing_features:
1300         if (perf_missing_features.clockid_wrong)
1301                 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1302         if (perf_missing_features.clockid) {
1303                 evsel->attr.use_clockid = 0;
1304                 evsel->attr.clockid = 0;
1305         }
1306         if (perf_missing_features.cloexec)
1307                 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1308         if (perf_missing_features.mmap2)
1309                 evsel->attr.mmap2 = 0;
1310         if (perf_missing_features.exclude_guest)
1311                 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1312 retry_sample_id:
1313         if (perf_missing_features.sample_id_all)
1314                 evsel->attr.sample_id_all = 0;
1315
1316         if (verbose >= 2) {
1317                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1318                 fprintf(stderr, "perf_event_attr:\n");
1319                 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1320                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1321         }
1322
1323         for (cpu = 0; cpu < cpus->nr; cpu++) {
1324
1325                 for (thread = 0; thread < nthreads; thread++) {
1326                         int group_fd;
1327
1328                         if (!evsel->cgrp && !evsel->system_wide)
1329                                 pid = thread_map__pid(threads, thread);
1330
1331                         group_fd = get_group_fd(evsel, cpu, thread);
1332 retry_open:
1333                         pr_debug2("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx\n",
1334                                   pid, cpus->map[cpu], group_fd, flags);
1335
1336                         FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
1337                                                                      pid,
1338                                                                      cpus->map[cpu],
1339                                                                      group_fd, flags);
1340                         if (FD(evsel, cpu, thread) < 0) {
1341                                 err = -errno;
1342                                 pr_debug2("sys_perf_event_open failed, error %d\n",
1343                                           err);
1344                                 goto try_fallback;
1345                         }
1346                         set_rlimit = NO_CHANGE;
1347
1348                         /*
1349                          * If we succeeded but had to kill clockid, fail and
1350                          * have perf_evsel__open_strerror() print us a nice
1351                          * error.
1352                          */
1353                         if (perf_missing_features.clockid ||
1354                             perf_missing_features.clockid_wrong) {
1355                                 err = -EINVAL;
1356                                 goto out_close;
1357                         }
1358                 }
1359         }
1360
1361         return 0;
1362
1363 try_fallback:
1364         /*
1365          * perf stat needs between 5 and 22 fds per CPU. When we run out
1366          * of them try to increase the limits.
1367          */
1368         if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1369                 struct rlimit l;
1370                 int old_errno = errno;
1371
1372                 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1373                         if (set_rlimit == NO_CHANGE)
1374                                 l.rlim_cur = l.rlim_max;
1375                         else {
1376                                 l.rlim_cur = l.rlim_max + 1000;
1377                                 l.rlim_max = l.rlim_cur;
1378                         }
1379                         if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1380                                 set_rlimit++;
1381                                 errno = old_errno;
1382                                 goto retry_open;
1383                         }
1384                 }
1385                 errno = old_errno;
1386         }
1387
1388         if (err != -EINVAL || cpu > 0 || thread > 0)
1389                 goto out_close;
1390
1391         /*
1392          * Must probe features in the order they were added to the
1393          * perf_event_attr interface.
1394          */
1395         if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1396                 perf_missing_features.clockid_wrong = true;
1397                 goto fallback_missing_features;
1398         } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1399                 perf_missing_features.clockid = true;
1400                 goto fallback_missing_features;
1401         } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1402                 perf_missing_features.cloexec = true;
1403                 goto fallback_missing_features;
1404         } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1405                 perf_missing_features.mmap2 = true;
1406                 goto fallback_missing_features;
1407         } else if (!perf_missing_features.exclude_guest &&
1408                    (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1409                 perf_missing_features.exclude_guest = true;
1410                 goto fallback_missing_features;
1411         } else if (!perf_missing_features.sample_id_all) {
1412                 perf_missing_features.sample_id_all = true;
1413                 goto retry_sample_id;
1414         }
1415
1416 out_close:
1417         do {
1418                 while (--thread >= 0) {
1419                         close(FD(evsel, cpu, thread));
1420                         FD(evsel, cpu, thread) = -1;
1421                 }
1422                 thread = nthreads;
1423         } while (--cpu >= 0);
1424         return err;
1425 }
1426
1427 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1428 {
1429         if (evsel->fd == NULL)
1430                 return;
1431
1432         perf_evsel__close_fd(evsel, ncpus, nthreads);
1433         perf_evsel__free_fd(evsel);
1434 }
1435
1436 static struct {
1437         struct cpu_map map;
1438         int cpus[1];
1439 } empty_cpu_map = {
1440         .map.nr = 1,
1441         .cpus   = { -1, },
1442 };
1443
1444 static struct {
1445         struct thread_map map;
1446         int threads[1];
1447 } empty_thread_map = {
1448         .map.nr  = 1,
1449         .threads = { -1, },
1450 };
1451
1452 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1453                      struct thread_map *threads)
1454 {
1455         if (cpus == NULL) {
1456                 /* Work around old compiler warnings about strict aliasing */
1457                 cpus = &empty_cpu_map.map;
1458         }
1459
1460         if (threads == NULL)
1461                 threads = &empty_thread_map.map;
1462
1463         return __perf_evsel__open(evsel, cpus, threads);
1464 }
1465
1466 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1467                              struct cpu_map *cpus)
1468 {
1469         return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1470 }
1471
1472 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1473                                 struct thread_map *threads)
1474 {
1475         return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1476 }
1477
1478 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1479                                        const union perf_event *event,
1480                                        struct perf_sample *sample)
1481 {
1482         u64 type = evsel->attr.sample_type;
1483         const u64 *array = event->sample.array;
1484         bool swapped = evsel->needs_swap;
1485         union u64_swap u;
1486
1487         array += ((event->header.size -
1488                    sizeof(event->header)) / sizeof(u64)) - 1;
1489
1490         if (type & PERF_SAMPLE_IDENTIFIER) {
1491                 sample->id = *array;
1492                 array--;
1493         }
1494
1495         if (type & PERF_SAMPLE_CPU) {
1496                 u.val64 = *array;
1497                 if (swapped) {
1498                         /* undo swap of u64, then swap on individual u32s */
1499                         u.val64 = bswap_64(u.val64);
1500                         u.val32[0] = bswap_32(u.val32[0]);
1501                 }
1502
1503                 sample->cpu = u.val32[0];
1504                 array--;
1505         }
1506
1507         if (type & PERF_SAMPLE_STREAM_ID) {
1508                 sample->stream_id = *array;
1509                 array--;
1510         }
1511
1512         if (type & PERF_SAMPLE_ID) {
1513                 sample->id = *array;
1514                 array--;
1515         }
1516
1517         if (type & PERF_SAMPLE_TIME) {
1518                 sample->time = *array;
1519                 array--;
1520         }
1521
1522         if (type & PERF_SAMPLE_TID) {
1523                 u.val64 = *array;
1524                 if (swapped) {
1525                         /* undo swap of u64, then swap on individual u32s */
1526                         u.val64 = bswap_64(u.val64);
1527                         u.val32[0] = bswap_32(u.val32[0]);
1528                         u.val32[1] = bswap_32(u.val32[1]);
1529                 }
1530
1531                 sample->pid = u.val32[0];
1532                 sample->tid = u.val32[1];
1533                 array--;
1534         }
1535
1536         return 0;
1537 }
1538
1539 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1540                             u64 size)
1541 {
1542         return size > max_size || offset + size > endp;
1543 }
1544
1545 #define OVERFLOW_CHECK(offset, size, max_size)                          \
1546         do {                                                            \
1547                 if (overflow(endp, (max_size), (offset), (size)))       \
1548                         return -EFAULT;                                 \
1549         } while (0)
1550
1551 #define OVERFLOW_CHECK_u64(offset) \
1552         OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1553
1554 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1555                              struct perf_sample *data)
1556 {
1557         u64 type = evsel->attr.sample_type;
1558         bool swapped = evsel->needs_swap;
1559         const u64 *array;
1560         u16 max_size = event->header.size;
1561         const void *endp = (void *)event + max_size;
1562         u64 sz;
1563
1564         /*
1565          * used for cross-endian analysis. See git commit 65014ab3
1566          * for why this goofiness is needed.
1567          */
1568         union u64_swap u;
1569
1570         memset(data, 0, sizeof(*data));
1571         data->cpu = data->pid = data->tid = -1;
1572         data->stream_id = data->id = data->time = -1ULL;
1573         data->period = evsel->attr.sample_period;
1574         data->weight = 0;
1575
1576         if (event->header.type != PERF_RECORD_SAMPLE) {
1577                 if (!evsel->attr.sample_id_all)
1578                         return 0;
1579                 return perf_evsel__parse_id_sample(evsel, event, data);
1580         }
1581
1582         array = event->sample.array;
1583
1584         /*
1585          * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1586          * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
1587          * check the format does not go past the end of the event.
1588          */
1589         if (evsel->sample_size + sizeof(event->header) > event->header.size)
1590                 return -EFAULT;
1591
1592         data->id = -1ULL;
1593         if (type & PERF_SAMPLE_IDENTIFIER) {
1594                 data->id = *array;
1595                 array++;
1596         }
1597
1598         if (type & PERF_SAMPLE_IP) {
1599                 data->ip = *array;
1600                 array++;
1601         }
1602
1603         if (type & PERF_SAMPLE_TID) {
1604                 u.val64 = *array;
1605                 if (swapped) {
1606                         /* undo swap of u64, then swap on individual u32s */
1607                         u.val64 = bswap_64(u.val64);
1608                         u.val32[0] = bswap_32(u.val32[0]);
1609                         u.val32[1] = bswap_32(u.val32[1]);
1610                 }
1611
1612                 data->pid = u.val32[0];
1613                 data->tid = u.val32[1];
1614                 array++;
1615         }
1616
1617         if (type & PERF_SAMPLE_TIME) {
1618                 data->time = *array;
1619                 array++;
1620         }
1621
1622         data->addr = 0;
1623         if (type & PERF_SAMPLE_ADDR) {
1624                 data->addr = *array;
1625                 array++;
1626         }
1627
1628         if (type & PERF_SAMPLE_ID) {
1629                 data->id = *array;
1630                 array++;
1631         }
1632
1633         if (type & PERF_SAMPLE_STREAM_ID) {
1634                 data->stream_id = *array;
1635                 array++;
1636         }
1637
1638         if (type & PERF_SAMPLE_CPU) {
1639
1640                 u.val64 = *array;
1641                 if (swapped) {
1642                         /* undo swap of u64, then swap on individual u32s */
1643                         u.val64 = bswap_64(u.val64);
1644                         u.val32[0] = bswap_32(u.val32[0]);
1645                 }
1646
1647                 data->cpu = u.val32[0];
1648                 array++;
1649         }
1650
1651         if (type & PERF_SAMPLE_PERIOD) {
1652                 data->period = *array;
1653                 array++;
1654         }
1655
1656         if (type & PERF_SAMPLE_READ) {
1657                 u64 read_format = evsel->attr.read_format;
1658
1659                 OVERFLOW_CHECK_u64(array);
1660                 if (read_format & PERF_FORMAT_GROUP)
1661                         data->read.group.nr = *array;
1662                 else
1663                         data->read.one.value = *array;
1664
1665                 array++;
1666
1667                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1668                         OVERFLOW_CHECK_u64(array);
1669                         data->read.time_enabled = *array;
1670                         array++;
1671                 }
1672
1673                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1674                         OVERFLOW_CHECK_u64(array);
1675                         data->read.time_running = *array;
1676                         array++;
1677                 }
1678
1679                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1680                 if (read_format & PERF_FORMAT_GROUP) {
1681                         const u64 max_group_nr = UINT64_MAX /
1682                                         sizeof(struct sample_read_value);
1683
1684                         if (data->read.group.nr > max_group_nr)
1685                                 return -EFAULT;
1686                         sz = data->read.group.nr *
1687                              sizeof(struct sample_read_value);
1688                         OVERFLOW_CHECK(array, sz, max_size);
1689                         data->read.group.values =
1690                                         (struct sample_read_value *)array;
1691                         array = (void *)array + sz;
1692                 } else {
1693                         OVERFLOW_CHECK_u64(array);
1694                         data->read.one.id = *array;
1695                         array++;
1696                 }
1697         }
1698
1699         if (type & PERF_SAMPLE_CALLCHAIN) {
1700                 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1701
1702                 OVERFLOW_CHECK_u64(array);
1703                 data->callchain = (struct ip_callchain *)array++;
1704                 if (data->callchain->nr > max_callchain_nr)
1705                         return -EFAULT;
1706                 sz = data->callchain->nr * sizeof(u64);
1707                 OVERFLOW_CHECK(array, sz, max_size);
1708                 array = (void *)array + sz;
1709         }
1710
1711         if (type & PERF_SAMPLE_RAW) {
1712                 OVERFLOW_CHECK_u64(array);
1713                 u.val64 = *array;
1714                 if (WARN_ONCE(swapped,
1715                               "Endianness of raw data not corrected!\n")) {
1716                         /* undo swap of u64, then swap on individual u32s */
1717                         u.val64 = bswap_64(u.val64);
1718                         u.val32[0] = bswap_32(u.val32[0]);
1719                         u.val32[1] = bswap_32(u.val32[1]);
1720                 }
1721                 data->raw_size = u.val32[0];
1722                 array = (void *)array + sizeof(u32);
1723
1724                 OVERFLOW_CHECK(array, data->raw_size, max_size);
1725                 data->raw_data = (void *)array;
1726                 array = (void *)array + data->raw_size;
1727         }
1728
1729         if (type & PERF_SAMPLE_BRANCH_STACK) {
1730                 const u64 max_branch_nr = UINT64_MAX /
1731                                           sizeof(struct branch_entry);
1732
1733                 OVERFLOW_CHECK_u64(array);
1734                 data->branch_stack = (struct branch_stack *)array++;
1735
1736                 if (data->branch_stack->nr > max_branch_nr)
1737                         return -EFAULT;
1738                 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1739                 OVERFLOW_CHECK(array, sz, max_size);
1740                 array = (void *)array + sz;
1741         }
1742
1743         if (type & PERF_SAMPLE_REGS_USER) {
1744                 OVERFLOW_CHECK_u64(array);
1745                 data->user_regs.abi = *array;
1746                 array++;
1747
1748                 if (data->user_regs.abi) {
1749                         u64 mask = evsel->attr.sample_regs_user;
1750
1751                         sz = hweight_long(mask) * sizeof(u64);
1752                         OVERFLOW_CHECK(array, sz, max_size);
1753                         data->user_regs.mask = mask;
1754                         data->user_regs.regs = (u64 *)array;
1755                         array = (void *)array + sz;
1756                 }
1757         }
1758
1759         if (type & PERF_SAMPLE_STACK_USER) {
1760                 OVERFLOW_CHECK_u64(array);
1761                 sz = *array++;
1762
1763                 data->user_stack.offset = ((char *)(array - 1)
1764                                           - (char *) event);
1765
1766                 if (!sz) {
1767                         data->user_stack.size = 0;
1768                 } else {
1769                         OVERFLOW_CHECK(array, sz, max_size);
1770                         data->user_stack.data = (char *)array;
1771                         array = (void *)array + sz;
1772                         OVERFLOW_CHECK_u64(array);
1773                         data->user_stack.size = *array++;
1774                         if (WARN_ONCE(data->user_stack.size > sz,
1775                                       "user stack dump failure\n"))
1776                                 return -EFAULT;
1777                 }
1778         }
1779
1780         data->weight = 0;
1781         if (type & PERF_SAMPLE_WEIGHT) {
1782                 OVERFLOW_CHECK_u64(array);
1783                 data->weight = *array;
1784                 array++;
1785         }
1786
1787         data->data_src = PERF_MEM_DATA_SRC_NONE;
1788         if (type & PERF_SAMPLE_DATA_SRC) {
1789                 OVERFLOW_CHECK_u64(array);
1790                 data->data_src = *array;
1791                 array++;
1792         }
1793
1794         data->transaction = 0;
1795         if (type & PERF_SAMPLE_TRANSACTION) {
1796                 OVERFLOW_CHECK_u64(array);
1797                 data->transaction = *array;
1798                 array++;
1799         }
1800
1801         data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
1802         if (type & PERF_SAMPLE_REGS_INTR) {
1803                 OVERFLOW_CHECK_u64(array);
1804                 data->intr_regs.abi = *array;
1805                 array++;
1806
1807                 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
1808                         u64 mask = evsel->attr.sample_regs_intr;
1809
1810                         sz = hweight_long(mask) * sizeof(u64);
1811                         OVERFLOW_CHECK(array, sz, max_size);
1812                         data->intr_regs.mask = mask;
1813                         data->intr_regs.regs = (u64 *)array;
1814                         array = (void *)array + sz;
1815                 }
1816         }
1817
1818         return 0;
1819 }
1820
1821 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1822                                      u64 read_format)
1823 {
1824         size_t sz, result = sizeof(struct sample_event);
1825
1826         if (type & PERF_SAMPLE_IDENTIFIER)
1827                 result += sizeof(u64);
1828
1829         if (type & PERF_SAMPLE_IP)
1830                 result += sizeof(u64);
1831
1832         if (type & PERF_SAMPLE_TID)
1833                 result += sizeof(u64);
1834
1835         if (type & PERF_SAMPLE_TIME)
1836                 result += sizeof(u64);
1837
1838         if (type & PERF_SAMPLE_ADDR)
1839                 result += sizeof(u64);
1840
1841         if (type & PERF_SAMPLE_ID)
1842                 result += sizeof(u64);
1843
1844         if (type & PERF_SAMPLE_STREAM_ID)
1845                 result += sizeof(u64);
1846
1847         if (type & PERF_SAMPLE_CPU)
1848                 result += sizeof(u64);
1849
1850         if (type & PERF_SAMPLE_PERIOD)
1851                 result += sizeof(u64);
1852
1853         if (type & PERF_SAMPLE_READ) {
1854                 result += sizeof(u64);
1855                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1856                         result += sizeof(u64);
1857                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1858                         result += sizeof(u64);
1859                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1860                 if (read_format & PERF_FORMAT_GROUP) {
1861                         sz = sample->read.group.nr *
1862                              sizeof(struct sample_read_value);
1863                         result += sz;
1864                 } else {
1865                         result += sizeof(u64);
1866                 }
1867         }
1868
1869         if (type & PERF_SAMPLE_CALLCHAIN) {
1870                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1871                 result += sz;
1872         }
1873
1874         if (type & PERF_SAMPLE_RAW) {
1875                 result += sizeof(u32);
1876                 result += sample->raw_size;
1877         }
1878
1879         if (type & PERF_SAMPLE_BRANCH_STACK) {
1880                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1881                 sz += sizeof(u64);
1882                 result += sz;
1883         }
1884
1885         if (type & PERF_SAMPLE_REGS_USER) {
1886                 if (sample->user_regs.abi) {
1887                         result += sizeof(u64);
1888                         sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1889                         result += sz;
1890                 } else {
1891                         result += sizeof(u64);
1892                 }
1893         }
1894
1895         if (type & PERF_SAMPLE_STACK_USER) {
1896                 sz = sample->user_stack.size;
1897                 result += sizeof(u64);
1898                 if (sz) {
1899                         result += sz;
1900                         result += sizeof(u64);
1901                 }
1902         }
1903
1904         if (type & PERF_SAMPLE_WEIGHT)
1905                 result += sizeof(u64);
1906
1907         if (type & PERF_SAMPLE_DATA_SRC)
1908                 result += sizeof(u64);
1909
1910         if (type & PERF_SAMPLE_TRANSACTION)
1911                 result += sizeof(u64);
1912
1913         if (type & PERF_SAMPLE_REGS_INTR) {
1914                 if (sample->intr_regs.abi) {
1915                         result += sizeof(u64);
1916                         sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1917                         result += sz;
1918                 } else {
1919                         result += sizeof(u64);
1920                 }
1921         }
1922
1923         return result;
1924 }
1925
1926 int perf_event__synthesize_sample(union perf_event *event, u64 type,
1927                                   u64 read_format,
1928                                   const struct perf_sample *sample,
1929                                   bool swapped)
1930 {
1931         u64 *array;
1932         size_t sz;
1933         /*
1934          * used for cross-endian analysis. See git commit 65014ab3
1935          * for why this goofiness is needed.
1936          */
1937         union u64_swap u;
1938
1939         array = event->sample.array;
1940
1941         if (type & PERF_SAMPLE_IDENTIFIER) {
1942                 *array = sample->id;
1943                 array++;
1944         }
1945
1946         if (type & PERF_SAMPLE_IP) {
1947                 *array = sample->ip;
1948                 array++;
1949         }
1950
1951         if (type & PERF_SAMPLE_TID) {
1952                 u.val32[0] = sample->pid;
1953                 u.val32[1] = sample->tid;
1954                 if (swapped) {
1955                         /*
1956                          * Inverse of what is done in perf_evsel__parse_sample
1957                          */
1958                         u.val32[0] = bswap_32(u.val32[0]);
1959                         u.val32[1] = bswap_32(u.val32[1]);
1960                         u.val64 = bswap_64(u.val64);
1961                 }
1962
1963                 *array = u.val64;
1964                 array++;
1965         }
1966
1967         if (type & PERF_SAMPLE_TIME) {
1968                 *array = sample->time;
1969                 array++;
1970         }
1971
1972         if (type & PERF_SAMPLE_ADDR) {
1973                 *array = sample->addr;
1974                 array++;
1975         }
1976
1977         if (type & PERF_SAMPLE_ID) {
1978                 *array = sample->id;
1979                 array++;
1980         }
1981
1982         if (type & PERF_SAMPLE_STREAM_ID) {
1983                 *array = sample->stream_id;
1984                 array++;
1985         }
1986
1987         if (type & PERF_SAMPLE_CPU) {
1988                 u.val32[0] = sample->cpu;
1989                 if (swapped) {
1990                         /*
1991                          * Inverse of what is done in perf_evsel__parse_sample
1992                          */
1993                         u.val32[0] = bswap_32(u.val32[0]);
1994                         u.val64 = bswap_64(u.val64);
1995                 }
1996                 *array = u.val64;
1997                 array++;
1998         }
1999
2000         if (type & PERF_SAMPLE_PERIOD) {
2001                 *array = sample->period;
2002                 array++;
2003         }
2004
2005         if (type & PERF_SAMPLE_READ) {
2006                 if (read_format & PERF_FORMAT_GROUP)
2007                         *array = sample->read.group.nr;
2008                 else
2009                         *array = sample->read.one.value;
2010                 array++;
2011
2012                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2013                         *array = sample->read.time_enabled;
2014                         array++;
2015                 }
2016
2017                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2018                         *array = sample->read.time_running;
2019                         array++;
2020                 }
2021
2022                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2023                 if (read_format & PERF_FORMAT_GROUP) {
2024                         sz = sample->read.group.nr *
2025                              sizeof(struct sample_read_value);
2026                         memcpy(array, sample->read.group.values, sz);
2027                         array = (void *)array + sz;
2028                 } else {
2029                         *array = sample->read.one.id;
2030                         array++;
2031                 }
2032         }
2033
2034         if (type & PERF_SAMPLE_CALLCHAIN) {
2035                 sz = (sample->callchain->nr + 1) * sizeof(u64);
2036                 memcpy(array, sample->callchain, sz);
2037                 array = (void *)array + sz;
2038         }
2039
2040         if (type & PERF_SAMPLE_RAW) {
2041                 u.val32[0] = sample->raw_size;
2042                 if (WARN_ONCE(swapped,
2043                               "Endianness of raw data not corrected!\n")) {
2044                         /*
2045                          * Inverse of what is done in perf_evsel__parse_sample
2046                          */
2047                         u.val32[0] = bswap_32(u.val32[0]);
2048                         u.val32[1] = bswap_32(u.val32[1]);
2049                         u.val64 = bswap_64(u.val64);
2050                 }
2051                 *array = u.val64;
2052                 array = (void *)array + sizeof(u32);
2053
2054                 memcpy(array, sample->raw_data, sample->raw_size);
2055                 array = (void *)array + sample->raw_size;
2056         }
2057
2058         if (type & PERF_SAMPLE_BRANCH_STACK) {
2059                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2060                 sz += sizeof(u64);
2061                 memcpy(array, sample->branch_stack, sz);
2062                 array = (void *)array + sz;
2063         }
2064
2065         if (type & PERF_SAMPLE_REGS_USER) {
2066                 if (sample->user_regs.abi) {
2067                         *array++ = sample->user_regs.abi;
2068                         sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2069                         memcpy(array, sample->user_regs.regs, sz);
2070                         array = (void *)array + sz;
2071                 } else {
2072                         *array++ = 0;
2073                 }
2074         }
2075
2076         if (type & PERF_SAMPLE_STACK_USER) {
2077                 sz = sample->user_stack.size;
2078                 *array++ = sz;
2079                 if (sz) {
2080                         memcpy(array, sample->user_stack.data, sz);
2081                         array = (void *)array + sz;
2082                         *array++ = sz;
2083                 }
2084         }
2085
2086         if (type & PERF_SAMPLE_WEIGHT) {
2087                 *array = sample->weight;
2088                 array++;
2089         }
2090
2091         if (type & PERF_SAMPLE_DATA_SRC) {
2092                 *array = sample->data_src;
2093                 array++;
2094         }
2095
2096         if (type & PERF_SAMPLE_TRANSACTION) {
2097                 *array = sample->transaction;
2098                 array++;
2099         }
2100
2101         if (type & PERF_SAMPLE_REGS_INTR) {
2102                 if (sample->intr_regs.abi) {
2103                         *array++ = sample->intr_regs.abi;
2104                         sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2105                         memcpy(array, sample->intr_regs.regs, sz);
2106                         array = (void *)array + sz;
2107                 } else {
2108                         *array++ = 0;
2109                 }
2110         }
2111
2112         return 0;
2113 }
2114
2115 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2116 {
2117         return pevent_find_field(evsel->tp_format, name);
2118 }
2119
2120 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2121                          const char *name)
2122 {
2123         struct format_field *field = perf_evsel__field(evsel, name);
2124         int offset;
2125
2126         if (!field)
2127                 return NULL;
2128
2129         offset = field->offset;
2130
2131         if (field->flags & FIELD_IS_DYNAMIC) {
2132                 offset = *(int *)(sample->raw_data + field->offset);
2133                 offset &= 0xffff;
2134         }
2135
2136         return sample->raw_data + offset;
2137 }
2138
2139 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2140                        const char *name)
2141 {
2142         struct format_field *field = perf_evsel__field(evsel, name);
2143         void *ptr;
2144         u64 value;
2145
2146         if (!field)
2147                 return 0;
2148
2149         ptr = sample->raw_data + field->offset;
2150
2151         switch (field->size) {
2152         case 1:
2153                 return *(u8 *)ptr;
2154         case 2:
2155                 value = *(u16 *)ptr;
2156                 break;
2157         case 4:
2158                 value = *(u32 *)ptr;
2159                 break;
2160         case 8:
2161                 memcpy(&value, ptr, sizeof(u64));
2162                 break;
2163         default:
2164                 return 0;
2165         }
2166
2167         if (!evsel->needs_swap)
2168                 return value;
2169
2170         switch (field->size) {
2171         case 2:
2172                 return bswap_16(value);
2173         case 4:
2174                 return bswap_32(value);
2175         case 8:
2176                 return bswap_64(value);
2177         default:
2178                 return 0;
2179         }
2180
2181         return 0;
2182 }
2183
2184 static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
2185 {
2186         va_list args;
2187         int ret = 0;
2188
2189         if (!*first) {
2190                 ret += fprintf(fp, ",");
2191         } else {
2192                 ret += fprintf(fp, ":");
2193                 *first = false;
2194         }
2195
2196         va_start(args, fmt);
2197         ret += vfprintf(fp, fmt, args);
2198         va_end(args);
2199         return ret;
2200 }
2201
2202 static int __print_attr__fprintf(FILE *fp, const char *name, const char *val, void *priv)
2203 {
2204         return comma_fprintf(fp, (bool *)priv, " %s: %s", name, val);
2205 }
2206
2207 int perf_evsel__fprintf(struct perf_evsel *evsel,
2208                         struct perf_attr_details *details, FILE *fp)
2209 {
2210         bool first = true;
2211         int printed = 0;
2212
2213         if (details->event_group) {
2214                 struct perf_evsel *pos;
2215
2216                 if (!perf_evsel__is_group_leader(evsel))
2217                         return 0;
2218
2219                 if (evsel->nr_members > 1)
2220                         printed += fprintf(fp, "%s{", evsel->group_name ?: "");
2221
2222                 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2223                 for_each_group_member(pos, evsel)
2224                         printed += fprintf(fp, ",%s", perf_evsel__name(pos));
2225
2226                 if (evsel->nr_members > 1)
2227                         printed += fprintf(fp, "}");
2228                 goto out;
2229         }
2230
2231         printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2232
2233         if (details->verbose) {
2234                 printed += perf_event_attr__fprintf(fp, &evsel->attr,
2235                                                     __print_attr__fprintf, &first);
2236         } else if (details->freq) {
2237                 const char *term = "sample_freq";
2238
2239                 if (!evsel->attr.freq)
2240                         term = "sample_period";
2241
2242                 printed += comma_fprintf(fp, &first, " %s=%" PRIu64,
2243                                          term, (u64)evsel->attr.sample_freq);
2244         }
2245 out:
2246         fputc('\n', fp);
2247         return ++printed;
2248 }
2249
2250 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2251                           char *msg, size_t msgsize)
2252 {
2253         if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2254             evsel->attr.type   == PERF_TYPE_HARDWARE &&
2255             evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2256                 /*
2257                  * If it's cycles then fall back to hrtimer based
2258                  * cpu-clock-tick sw counter, which is always available even if
2259                  * no PMU support.
2260                  *
2261                  * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2262                  * b0a873e).
2263                  */
2264                 scnprintf(msg, msgsize, "%s",
2265 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2266
2267                 evsel->attr.type   = PERF_TYPE_SOFTWARE;
2268                 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2269
2270                 zfree(&evsel->name);
2271                 return true;
2272         }
2273
2274         return false;
2275 }
2276
2277 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2278                               int err, char *msg, size_t size)
2279 {
2280         char sbuf[STRERR_BUFSIZE];
2281
2282         switch (err) {
2283         case EPERM:
2284         case EACCES:
2285                 return scnprintf(msg, size,
2286                  "You may not have permission to collect %sstats.\n"
2287                  "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
2288                  " -1 - Not paranoid at all\n"
2289                  "  0 - Disallow raw tracepoint access for unpriv\n"
2290                  "  1 - Disallow cpu events for unpriv\n"
2291                  "  2 - Disallow kernel profiling for unpriv",
2292                                  target->system_wide ? "system-wide " : "");
2293         case ENOENT:
2294                 return scnprintf(msg, size, "The %s event is not supported.",
2295                                  perf_evsel__name(evsel));
2296         case EMFILE:
2297                 return scnprintf(msg, size, "%s",
2298                          "Too many events are opened.\n"
2299                          "Probably the maximum number of open file descriptors has been reached.\n"
2300                          "Hint: Try again after reducing the number of events.\n"
2301                          "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2302         case ENODEV:
2303                 if (target->cpu_list)
2304                         return scnprintf(msg, size, "%s",
2305          "No such device - did you specify an out-of-range profile CPU?\n");
2306                 break;
2307         case EOPNOTSUPP:
2308                 if (evsel->attr.precise_ip)
2309                         return scnprintf(msg, size, "%s",
2310         "\'precise\' request may not be supported. Try removing 'p' modifier.");
2311 #if defined(__i386__) || defined(__x86_64__)
2312                 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2313                         return scnprintf(msg, size, "%s",
2314         "No hardware sampling interrupt available.\n"
2315         "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2316 #endif
2317                 break;
2318         case EBUSY:
2319                 if (find_process("oprofiled"))
2320                         return scnprintf(msg, size,
2321         "The PMU counters are busy/taken by another profiler.\n"
2322         "We found oprofile daemon running, please stop it and try again.");
2323                 break;
2324         case EINVAL:
2325                 if (perf_missing_features.clockid)
2326                         return scnprintf(msg, size, "clockid feature not supported.");
2327                 if (perf_missing_features.clockid_wrong)
2328                         return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2329                 break;
2330         default:
2331                 break;
2332         }
2333
2334         return scnprintf(msg, size,
2335         "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2336         "/bin/dmesg may provide additional information.\n"
2337         "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
2338                          err, strerror_r(err, sbuf, sizeof(sbuf)),
2339                          perf_evsel__name(evsel));
2340 }