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 "asm/bug.h"
  13 #include <lk/debugfs.h>
  14 #include "event-parse.h"
  15 #include "evsel.h"
  16 #include "evlist.h"
  17 #include "util.h"
  18 #include "cpumap.h"
  19 #include "thread_map.h"
  20 #include "target.h"
  21 #include <linux/hw_breakpoint.h>
  22 #include <linux/perf_event.h>
  23 #include "perf_regs.h"
  24
  25 static struct {
  26         bool sample_id_all;
  27         bool exclude_guest;
  28 } perf_missing_features;
  29
  30 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  31
  32 static int __perf_evsel__sample_size(u64 sample_type)
  33 {
  34         u64 mask = sample_type & PERF_SAMPLE_MASK;
  35         int size = 0;
  36         int i;
  37
  38         for (i = 0; i < 64; i++) {
  39                 if (mask & (1ULL << i))
  40                         size++;
  41         }
  42
  43         size *= sizeof(u64);
  44
  45         return size;
  46 }
  47
  48 void hists__init(struct hists *hists)
  49 {
  50         memset(hists, 0, sizeof(*hists));
  51         hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;
  52         hists->entries_in = &hists->entries_in_array[0];
  53         hists->entries_collapsed = RB_ROOT;
  54         hists->entries = RB_ROOT;
  55         pthread_mutex_init(&hists->lock, NULL);
  56 }
  57
  58 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
  59                                   enum perf_event_sample_format bit)
  60 {
  61         if (!(evsel->attr.sample_type & bit)) {
  62                 evsel->attr.sample_type |= bit;
  63                 evsel->sample_size += sizeof(u64);
  64         }
  65 }
  66
  67 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
  68                                     enum perf_event_sample_format bit)
  69 {
  70         if (evsel->attr.sample_type & bit) {
  71                 evsel->attr.sample_type &= ~bit;
  72                 evsel->sample_size -= sizeof(u64);
  73         }
  74 }
  75
  76 void perf_evsel__set_sample_id(struct perf_evsel *evsel)
  77 {
  78         perf_evsel__set_sample_bit(evsel, ID);
  79         evsel->attr.read_format |= PERF_FORMAT_ID;
  80 }
  81
  82 void perf_evsel__init(struct perf_evsel *evsel,
  83                       struct perf_event_attr *attr, int idx)
  84 {
  85         evsel->idx         = idx;
  86         evsel->attr        = *attr;
  87         evsel->leader      = evsel;
  88         INIT_LIST_HEAD(&evsel->node);
  89         hists__init(&evsel->hists);
  90         evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
  91 }
  92
  93 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
  94 {
  95         struct perf_evsel *evsel = zalloc(sizeof(*evsel));
  96
  97         if (evsel != NULL)
  98                 perf_evsel__init(evsel, attr, idx);
  99
 100         return evsel;
 101 }
 102
 103 struct event_format *event_format__new(const char *sys, const char *name)
 104 {
 105         int fd, n;
 106         char *filename;
 107         void *bf = NULL, *nbf;
 108         size_t size = 0, alloc_size = 0;
 109         struct event_format *format = NULL;
 110
 111         if (asprintf(&filename, "%s/%s/%s/format", tracing_events_path, sys, name) < 0)
 112                 goto out;
 113
 114         fd = open(filename, O_RDONLY);
 115         if (fd < 0)
 116                 goto out_free_filename;
 117
 118         do {
 119                 if (size == alloc_size) {
 120                         alloc_size += BUFSIZ;
 121                         nbf = realloc(bf, alloc_size);
 122                         if (nbf == NULL)
 123                                 goto out_free_bf;
 124                         bf = nbf;
 125                 }
 126
 127                 n = read(fd, bf + size, BUFSIZ);
 128                 if (n < 0)
 129                         goto out_free_bf;
 130                 size += n;
 131         } while (n > 0);
 132
 133         pevent_parse_format(&format, bf, size, sys);
 134
 135 out_free_bf:
 136         free(bf);
 137         close(fd);
 138 out_free_filename:
 139         free(filename);
 140 out:
 141         return format;
 142 }
 143
 144 struct perf_evsel *perf_evsel__newtp(const char *sys, const char *name, int idx)
 145 {
 146         struct perf_evsel *evsel = zalloc(sizeof(*evsel));
 147
 148         if (evsel != NULL) {
 149                 struct perf_event_attr attr = {
 150                         .type          = PERF_TYPE_TRACEPOINT,
 151                         .sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 152                                           PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 153                 };
 154
 155                 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
 156                         goto out_free;
 157
 158                 evsel->tp_format = event_format__new(sys, name);
 159                 if (evsel->tp_format == NULL)
 160                         goto out_free;
 161
 162                 event_attr_init(&attr);
 163                 attr.config = evsel->tp_format->id;
 164                 attr.sample_period = 1;
 165                 perf_evsel__init(evsel, &attr, idx);
 166         }
 167
 168         return evsel;
 169
 170 out_free:
 171         free(evsel->name);
 172         free(evsel);
 173         return NULL;
 174 }
 175
 176 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
 177         "cycles",
 178         "instructions",
 179         "cache-references",
 180         "cache-misses",
 181         "branches",
 182         "branch-misses",
 183         "bus-cycles",
 184         "stalled-cycles-frontend",
 185         "stalled-cycles-backend",
 186         "ref-cycles",
 187 };
 188
 189 static const char *__perf_evsel__hw_name(u64 config)
 190 {
 191         if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
 192                 return perf_evsel__hw_names[config];
 193
 194         return "unknown-hardware";
 195 }
 196
 197 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
 198 {
 199         int colon = 0, r = 0;
 200         struct perf_event_attr *attr = &evsel->attr;
 201         bool exclude_guest_default = false;
 202
 203 #define MOD_PRINT(context, mod) do {                                    \
 204                 if (!attr->exclude_##context) {                         \
 205                         if (!colon) colon = ++r;                        \
 206                         r += scnprintf(bf + r, size - r, "%c", mod);    \
 207                 } } while(0)
 208
 209         if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
 210                 MOD_PRINT(kernel, 'k');
 211                 MOD_PRINT(user, 'u');
 212                 MOD_PRINT(hv, 'h');
 213                 exclude_guest_default = true;
 214         }
 215
 216         if (attr->precise_ip) {
 217                 if (!colon)
 218                         colon = ++r;
 219                 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
 220                 exclude_guest_default = true;
 221         }
 222
 223         if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
 224                 MOD_PRINT(host, 'H');
 225                 MOD_PRINT(guest, 'G');
 226         }
 227 #undef MOD_PRINT
 228         if (colon)
 229                 bf[colon - 1] = ':';
 230         return r;
 231 }
 232
 233 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
 234 {
 235         int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
 236         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 237 }
 238
 239 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
 240         "cpu-clock",
 241         "task-clock",
 242         "page-faults",
 243         "context-switches",
 244         "cpu-migrations",
 245         "minor-faults",
 246         "major-faults",
 247         "alignment-faults",
 248         "emulation-faults",
 249 };
 250
 251 static const char *__perf_evsel__sw_name(u64 config)
 252 {
 253         if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
 254                 return perf_evsel__sw_names[config];
 255         return "unknown-software";
 256 }
 257
 258 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
 259 {
 260         int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
 261         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 262 }
 263
 264 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
 265 {
 266         int r;
 267
 268         r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
 269
 270         if (type & HW_BREAKPOINT_R)
 271                 r += scnprintf(bf + r, size - r, "r");
 272
 273         if (type & HW_BREAKPOINT_W)
 274                 r += scnprintf(bf + r, size - r, "w");
 275
 276         if (type & HW_BREAKPOINT_X)
 277                 r += scnprintf(bf + r, size - r, "x");
 278
 279         return r;
 280 }
 281
 282 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
 283 {
 284         struct perf_event_attr *attr = &evsel->attr;
 285         int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
 286         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 287 }
 288
 289 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
 290                                 [PERF_EVSEL__MAX_ALIASES] = {
 291  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
 292  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
 293  { "LLC",       "L2",                                                   },
 294  { "dTLB",      "d-tlb",        "Data-TLB",                             },
 295  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
 296  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
 297  { "node",                                                              },
 298 };
 299
 300 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
 301                                    [PERF_EVSEL__MAX_ALIASES] = {
 302  { "load",      "loads",        "read",                                 },
 303  { "store",     "stores",       "write",                                },
 304  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
 305 };
 306
 307 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
 308                                        [PERF_EVSEL__MAX_ALIASES] = {
 309  { "refs",      "Reference",    "ops",          "access",               },
 310  { "misses",    "miss",                                                 },
 311 };
 312
 313 #define C(x)            PERF_COUNT_HW_CACHE_##x
 314 #define CACHE_READ      (1 << C(OP_READ))
 315 #define CACHE_WRITE     (1 << C(OP_WRITE))
 316 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
 317 #define COP(x)          (1 << x)
 318
 319 /*
 320  * cache operartion stat
 321  * L1I : Read and prefetch only
 322  * ITLB and BPU : Read-only
 323  */
 324 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
 325  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 326  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
 327  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 328  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 329  [C(ITLB)]      = (CACHE_READ),
 330  [C(BPU)]       = (CACHE_READ),
 331  [C(NODE)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 332 };
 333
 334 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
 335 {
 336         if (perf_evsel__hw_cache_stat[type] & COP(op))
 337                 return true;    /* valid */
 338         else
 339                 return false;   /* invalid */
 340 }
 341
 342 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
 343                                             char *bf, size_t size)
 344 {
 345         if (result) {
 346                 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
 347                                  perf_evsel__hw_cache_op[op][0],
 348                                  perf_evsel__hw_cache_result[result][0]);
 349         }
 350
 351         return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
 352                          perf_evsel__hw_cache_op[op][1]);
 353 }
 354
 355 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
 356 {
 357         u8 op, result, type = (config >>  0) & 0xff;
 358         const char *err = "unknown-ext-hardware-cache-type";
 359
 360         if (type > PERF_COUNT_HW_CACHE_MAX)
 361                 goto out_err;
 362
 363         op = (config >>  8) & 0xff;
 364         err = "unknown-ext-hardware-cache-op";
 365         if (op > PERF_COUNT_HW_CACHE_OP_MAX)
 366                 goto out_err;
 367
 368         result = (config >> 16) & 0xff;
 369         err = "unknown-ext-hardware-cache-result";
 370         if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
 371                 goto out_err;
 372
 373         err = "invalid-cache";
 374         if (!perf_evsel__is_cache_op_valid(type, op))
 375                 goto out_err;
 376
 377         return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
 378 out_err:
 379         return scnprintf(bf, size, "%s", err);
 380 }
 381
 382 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
 383 {
 384         int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
 385         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 386 }
 387
 388 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
 389 {
 390         int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
 391         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 392 }
 393
 394 const char *perf_evsel__name(struct perf_evsel *evsel)
 395 {
 396         char bf[128];
 397
 398         if (evsel->name)
 399                 return evsel->name;
 400
 401         switch (evsel->attr.type) {
 402         case PERF_TYPE_RAW:
 403                 perf_evsel__raw_name(evsel, bf, sizeof(bf));
 404                 break;
 405
 406         case PERF_TYPE_HARDWARE:
 407                 perf_evsel__hw_name(evsel, bf, sizeof(bf));
 408                 break;
 409
 410         case PERF_TYPE_HW_CACHE:
 411                 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
 412                 break;
 413
 414         case PERF_TYPE_SOFTWARE:
 415                 perf_evsel__sw_name(evsel, bf, sizeof(bf));
 416                 break;
 417
 418         case PERF_TYPE_TRACEPOINT:
 419                 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
 420                 break;
 421
 422         case PERF_TYPE_BREAKPOINT:
 423                 perf_evsel__bp_name(evsel, bf, sizeof(bf));
 424                 break;
 425
 426         default:
 427                 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
 428                           evsel->attr.type);
 429                 break;
 430         }
 431
 432         evsel->name = strdup(bf);
 433
 434         return evsel->name ?: "unknown";
 435 }
 436
 437 const char *perf_evsel__group_name(struct perf_evsel *evsel)
 438 {
 439         return evsel->group_name ?: "anon group";
 440 }
 441
 442 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
 443 {
 444         int ret;
 445         struct perf_evsel *pos;
 446         const char *group_name = perf_evsel__group_name(evsel);
 447
 448         ret = scnprintf(buf, size, "%s", group_name);
 449
 450         ret += scnprintf(buf + ret, size - ret, " { %s",
 451                          perf_evsel__name(evsel));
 452
 453         for_each_group_member(pos, evsel)
 454                 ret += scnprintf(buf + ret, size - ret, ", %s",
 455                                  perf_evsel__name(pos));
 456
 457         ret += scnprintf(buf + ret, size - ret, " }");
 458
 459         return ret;
 460 }
 461
 462 /*
 463  * The enable_on_exec/disabled value strategy:
 464  *
 465  *  1) For any type of traced program:
 466  *    - all independent events and group leaders are disabled
 467  *    - all group members are enabled
 468  *
 469  *     Group members are ruled by group leaders. They need to
 470  *     be enabled, because the group scheduling relies on that.
 471  *
 472  *  2) For traced programs executed by perf:
 473  *     - all independent events and group leaders have
 474  *       enable_on_exec set
 475  *     - we don't specifically enable or disable any event during
 476  *       the record command
 477  *
 478  *     Independent events and group leaders are initially disabled
 479  *     and get enabled by exec. Group members are ruled by group
 480  *     leaders as stated in 1).
 481  *
 482  *  3) For traced programs attached by perf (pid/tid):
 483  *     - we specifically enable or disable all events during
 484  *       the record command
 485  *
 486  *     When attaching events to already running traced we
 487  *     enable/disable events specifically, as there's no
 488  *     initial traced exec call.
 489  */
 490 void perf_evsel__config(struct perf_evsel *evsel,
 491                         struct perf_record_opts *opts)
 492 {
 493         struct perf_event_attr *attr = &evsel->attr;
 494         int track = !evsel->idx; /* only the first counter needs these */
 495
 496         attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
 497         attr->inherit       = !opts->no_inherit;
 498
 499         perf_evsel__set_sample_bit(evsel, IP);
 500         perf_evsel__set_sample_bit(evsel, TID);
 501
 502         /*
 503          * We default some events to a 1 default interval. But keep
 504          * it a weak assumption overridable by the user.
 505          */
 506         if (!attr->sample_period || (opts->user_freq != UINT_MAX &&
 507                                      opts->user_interval != ULLONG_MAX)) {
 508                 if (opts->freq) {
 509                         perf_evsel__set_sample_bit(evsel, PERIOD);
 510                         attr->freq              = 1;
 511                         attr->sample_freq       = opts->freq;
 512                 } else {
 513                         attr->sample_period = opts->default_interval;
 514                 }
 515         }
 516
 517         if (opts->no_samples)
 518                 attr->sample_freq = 0;
 519
 520         if (opts->inherit_stat)
 521                 attr->inherit_stat = 1;
 522
 523         if (opts->sample_address) {
 524                 perf_evsel__set_sample_bit(evsel, ADDR);
 525                 attr->mmap_data = track;
 526         }
 527
 528         if (opts->call_graph) {
 529                 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
 530
 531                 if (opts->call_graph == CALLCHAIN_DWARF) {
 532                         perf_evsel__set_sample_bit(evsel, REGS_USER);
 533                         perf_evsel__set_sample_bit(evsel, STACK_USER);
 534                         attr->sample_regs_user = PERF_REGS_MASK;
 535                         attr->sample_stack_user = opts->stack_dump_size;
 536                         attr->exclude_callchain_user = 1;
 537                 }
 538         }
 539
 540         if (perf_target__has_cpu(&opts->target))
 541                 perf_evsel__set_sample_bit(evsel, CPU);
 542
 543         if (opts->period)
 544                 perf_evsel__set_sample_bit(evsel, PERIOD);
 545
 546         if (!perf_missing_features.sample_id_all &&
 547             (opts->sample_time || !opts->no_inherit ||
 548              perf_target__has_cpu(&opts->target)))
 549                 perf_evsel__set_sample_bit(evsel, TIME);
 550
 551         if (opts->raw_samples) {
 552                 perf_evsel__set_sample_bit(evsel, TIME);
 553                 perf_evsel__set_sample_bit(evsel, RAW);
 554                 perf_evsel__set_sample_bit(evsel, CPU);
 555         }
 556
 557         if (opts->sample_address)
 558                 attr->sample_type       |= PERF_SAMPLE_DATA_SRC;
 559
 560         if (opts->no_delay) {
 561                 attr->watermark = 0;
 562                 attr->wakeup_events = 1;
 563         }
 564         if (opts->branch_stack) {
 565                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 566                 attr->branch_sample_type = opts->branch_stack;
 567         }
 568
 569         if (opts->sample_weight)
 570                 attr->sample_type       |= PERF_SAMPLE_WEIGHT;
 571
 572         attr->mmap = track;
 573         attr->comm = track;
 574
 575         /*
 576          * XXX see the function comment above
 577          *
 578          * Disabling only independent events or group leaders,
 579          * keeping group members enabled.
 580          */
 581         if (perf_evsel__is_group_leader(evsel))
 582                 attr->disabled = 1;
 583
 584         /*
 585          * Setting enable_on_exec for independent events and
 586          * group leaders for traced executed by perf.
 587          */
 588         if (perf_target__none(&opts->target) && perf_evsel__is_group_leader(evsel))
 589                 attr->enable_on_exec = 1;
 590 }
 591
 592 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
 593 {
 594         int cpu, thread;
 595         evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
 596
 597         if (evsel->fd) {
 598                 for (cpu = 0; cpu < ncpus; cpu++) {
 599                         for (thread = 0; thread < nthreads; thread++) {
 600                                 FD(evsel, cpu, thread) = -1;
 601                         }
 602                 }
 603         }
 604
 605         return evsel->fd != NULL ? 0 : -ENOMEM;
 606 }
 607
 608 int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
 609                            const char *filter)
 610 {
 611         int cpu, thread;
 612
 613         for (cpu = 0; cpu < ncpus; cpu++) {
 614                 for (thread = 0; thread < nthreads; thread++) {
 615                         int fd = FD(evsel, cpu, thread),
 616                             err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
 617
 618                         if (err)
 619                                 return err;
 620                 }
 621         }
 622
 623         return 0;
 624 }
 625
 626 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
 627 {
 628         evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
 629         if (evsel->sample_id == NULL)
 630                 return -ENOMEM;
 631
 632         evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
 633         if (evsel->id == NULL) {
 634                 xyarray__delete(evsel->sample_id);
 635                 evsel->sample_id = NULL;
 636                 return -ENOMEM;
 637         }
 638
 639         return 0;
 640 }
 641
 642 void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus)
 643 {
 644         memset(evsel->counts, 0, (sizeof(*evsel->counts) +
 645                                  (ncpus * sizeof(struct perf_counts_values))));
 646 }
 647
 648 int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
 649 {
 650         evsel->counts = zalloc((sizeof(*evsel->counts) +
 651                                 (ncpus * sizeof(struct perf_counts_values))));
 652         return evsel->counts != NULL ? 0 : -ENOMEM;
 653 }
 654
 655 void perf_evsel__free_fd(struct perf_evsel *evsel)
 656 {
 657         xyarray__delete(evsel->fd);
 658         evsel->fd = NULL;
 659 }
 660
 661 void perf_evsel__free_id(struct perf_evsel *evsel)
 662 {
 663         xyarray__delete(evsel->sample_id);
 664         evsel->sample_id = NULL;
 665         free(evsel->id);
 666         evsel->id = NULL;
 667 }
 668
 669 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
 670 {
 671         int cpu, thread;
 672
 673         for (cpu = 0; cpu < ncpus; cpu++)
 674                 for (thread = 0; thread < nthreads; ++thread) {
 675                         close(FD(evsel, cpu, thread));
 676                         FD(evsel, cpu, thread) = -1;
 677                 }
 678 }
 679
 680 void perf_evsel__free_counts(struct perf_evsel *evsel)
 681 {
 682         free(evsel->counts);
 683 }
 684
 685 void perf_evsel__exit(struct perf_evsel *evsel)
 686 {
 687         assert(list_empty(&evsel->node));
 688         perf_evsel__free_fd(evsel);
 689         perf_evsel__free_id(evsel);
 690 }
 691
 692 void perf_evsel__delete(struct perf_evsel *evsel)
 693 {
 694         perf_evsel__exit(evsel);
 695         close_cgroup(evsel->cgrp);
 696         free(evsel->group_name);
 697         if (evsel->tp_format)
 698                 pevent_free_format(evsel->tp_format);
 699         free(evsel->name);
 700         free(evsel);
 701 }
 702
 703 static inline void compute_deltas(struct perf_evsel *evsel,
 704                                   int cpu,
 705                                   struct perf_counts_values *count)
 706 {
 707         struct perf_counts_values tmp;
 708
 709         if (!evsel->prev_raw_counts)
 710                 return;
 711
 712         if (cpu == -1) {
 713                 tmp = evsel->prev_raw_counts->aggr;
 714                 evsel->prev_raw_counts->aggr = *count;
 715         } else {
 716                 tmp = evsel->prev_raw_counts->cpu[cpu];
 717                 evsel->prev_raw_counts->cpu[cpu] = *count;
 718         }
 719
 720         count->val = count->val - tmp.val;
 721         count->ena = count->ena - tmp.ena;
 722         count->run = count->run - tmp.run;
 723 }
 724
 725 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
 726                               int cpu, int thread, bool scale)
 727 {
 728         struct perf_counts_values count;
 729         size_t nv = scale ? 3 : 1;
 730
 731         if (FD(evsel, cpu, thread) < 0)
 732                 return -EINVAL;
 733
 734         if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
 735                 return -ENOMEM;
 736
 737         if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
 738                 return -errno;
 739
 740         compute_deltas(evsel, cpu, &count);
 741
 742         if (scale) {
 743                 if (count.run == 0)
 744                         count.val = 0;
 745                 else if (count.run < count.ena)
 746                         count.val = (u64)((double)count.val * count.ena / count.run + 0.5);
 747         } else
 748                 count.ena = count.run = 0;
 749
 750         evsel->counts->cpu[cpu] = count;
 751         return 0;
 752 }
 753
 754 int __perf_evsel__read(struct perf_evsel *evsel,
 755                        int ncpus, int nthreads, bool scale)
 756 {
 757         size_t nv = scale ? 3 : 1;
 758         int cpu, thread;
 759         struct perf_counts_values *aggr = &evsel->counts->aggr, count;
 760
 761         aggr->val = aggr->ena = aggr->run = 0;
 762
 763         for (cpu = 0; cpu < ncpus; cpu++) {
 764                 for (thread = 0; thread < nthreads; thread++) {
 765                         if (FD(evsel, cpu, thread) < 0)
 766                                 continue;
 767
 768                         if (readn(FD(evsel, cpu, thread),
 769                                   &count, nv * sizeof(u64)) < 0)
 770                                 return -errno;
 771
 772                         aggr->val += count.val;
 773                         if (scale) {
 774                                 aggr->ena += count.ena;
 775                                 aggr->run += count.run;
 776                         }
 777                 }
 778         }
 779
 780         compute_deltas(evsel, -1, aggr);
 781
 782         evsel->counts->scaled = 0;
 783         if (scale) {
 784                 if (aggr->run == 0) {
 785                         evsel->counts->scaled = -1;
 786                         aggr->val = 0;
 787                         return 0;
 788                 }
 789
 790                 if (aggr->run < aggr->ena) {
 791                         evsel->counts->scaled = 1;
 792                         aggr->val = (u64)((double)aggr->val * aggr->ena / aggr->run + 0.5);
 793                 }
 794         } else
 795                 aggr->ena = aggr->run = 0;
 796
 797         return 0;
 798 }
 799
 800 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
 801 {
 802         struct perf_evsel *leader = evsel->leader;
 803         int fd;
 804
 805         if (perf_evsel__is_group_leader(evsel))
 806                 return -1;
 807
 808         /*
 809          * Leader must be already processed/open,
 810          * if not it's a bug.
 811          */
 812         BUG_ON(!leader->fd);
 813
 814         fd = FD(leader, cpu, thread);
 815         BUG_ON(fd == -1);
 816
 817         return fd;
 818 }
 819
 820 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 821                               struct thread_map *threads)
 822 {
 823         int cpu, thread;
 824         unsigned long flags = 0;
 825         int pid = -1, err;
 826
 827         if (evsel->fd == NULL &&
 828             perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
 829                 return -ENOMEM;
 830
 831         if (evsel->cgrp) {
 832                 flags = PERF_FLAG_PID_CGROUP;
 833                 pid = evsel->cgrp->fd;
 834         }
 835
 836 fallback_missing_features:
 837         if (perf_missing_features.exclude_guest)
 838                 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
 839 retry_sample_id:
 840         if (perf_missing_features.sample_id_all)
 841                 evsel->attr.sample_id_all = 0;
 842
 843         for (cpu = 0; cpu < cpus->nr; cpu++) {
 844
 845                 for (thread = 0; thread < threads->nr; thread++) {
 846                         int group_fd;
 847
 848                         if (!evsel->cgrp)
 849                                 pid = threads->map[thread];
 850
 851                         group_fd = get_group_fd(evsel, cpu, thread);
 852
 853                         FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
 854                                                                      pid,
 855                                                                      cpus->map[cpu],
 856                                                                      group_fd, flags);
 857                         if (FD(evsel, cpu, thread) < 0) {
 858                                 err = -errno;
 859                                 goto try_fallback;
 860                         }
 861                 }
 862         }
 863
 864         return 0;
 865
 866 try_fallback:
 867         if (err != -EINVAL || cpu > 0 || thread > 0)
 868                 goto out_close;
 869
 870         if (!perf_missing_features.exclude_guest &&
 871             (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
 872                 perf_missing_features.exclude_guest = true;
 873                 goto fallback_missing_features;
 874         } else if (!perf_missing_features.sample_id_all) {
 875                 perf_missing_features.sample_id_all = true;
 876                 goto retry_sample_id;
 877         }
 878
 879 out_close:
 880         do {
 881                 while (--thread >= 0) {
 882                         close(FD(evsel, cpu, thread));
 883                         FD(evsel, cpu, thread) = -1;
 884                 }
 885                 thread = threads->nr;
 886         } while (--cpu >= 0);
 887         return err;
 888 }
 889
 890 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
 891 {
 892         if (evsel->fd == NULL)
 893                 return;
 894
 895         perf_evsel__close_fd(evsel, ncpus, nthreads);
 896         perf_evsel__free_fd(evsel);
 897         evsel->fd = NULL;
 898 }
 899
 900 static struct {
 901         struct cpu_map map;
 902         int cpus[1];
 903 } empty_cpu_map = {
 904         .map.nr = 1,
 905         .cpus   = { -1, },
 906 };
 907
 908 static struct {
 909         struct thread_map map;
 910         int threads[1];
 911 } empty_thread_map = {
 912         .map.nr  = 1,
 913         .threads = { -1, },
 914 };
 915
 916 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 917                      struct thread_map *threads)
 918 {
 919         if (cpus == NULL) {
 920                 /* Work around old compiler warnings about strict aliasing */
 921                 cpus = &empty_cpu_map.map;
 922         }
 923
 924         if (threads == NULL)
 925                 threads = &empty_thread_map.map;
 926
 927         return __perf_evsel__open(evsel, cpus, threads);
 928 }
 929
 930 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
 931                              struct cpu_map *cpus)
 932 {
 933         return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
 934 }
 935
 936 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
 937                                 struct thread_map *threads)
 938 {
 939         return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
 940 }
 941
 942 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
 943                                        const union perf_event *event,
 944                                        struct perf_sample *sample)
 945 {
 946         u64 type = evsel->attr.sample_type;
 947         const u64 *array = event->sample.array;
 948         bool swapped = evsel->needs_swap;
 949         union u64_swap u;
 950
 951         array += ((event->header.size -
 952                    sizeof(event->header)) / sizeof(u64)) - 1;
 953
 954         if (type & PERF_SAMPLE_CPU) {
 955                 u.val64 = *array;
 956                 if (swapped) {
 957                         /* undo swap of u64, then swap on individual u32s */
 958                         u.val64 = bswap_64(u.val64);
 959                         u.val32[0] = bswap_32(u.val32[0]);
 960                 }
 961
 962                 sample->cpu = u.val32[0];
 963                 array--;
 964         }
 965
 966         if (type & PERF_SAMPLE_STREAM_ID) {
 967                 sample->stream_id = *array;
 968                 array--;
 969         }
 970
 971         if (type & PERF_SAMPLE_ID) {
 972                 sample->id = *array;
 973                 array--;
 974         }
 975
 976         if (type & PERF_SAMPLE_TIME) {
 977                 sample->time = *array;
 978                 array--;
 979         }
 980
 981         if (type & PERF_SAMPLE_TID) {
 982                 u.val64 = *array;
 983                 if (swapped) {
 984                         /* undo swap of u64, then swap on individual u32s */
 985                         u.val64 = bswap_64(u.val64);
 986                         u.val32[0] = bswap_32(u.val32[0]);
 987                         u.val32[1] = bswap_32(u.val32[1]);
 988                 }
 989
 990                 sample->pid = u.val32[0];
 991                 sample->tid = u.val32[1];
 992         }
 993
 994         return 0;
 995 }
 996
 997 static bool sample_overlap(const union perf_event *event,
 998                            const void *offset, u64 size)
 999 {
1000         const void *base = event;
1001
1002         if (offset + size > base + event->header.size)
1003                 return true;
1004
1005         return false;
1006 }
1007
1008 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1009                              struct perf_sample *data)
1010 {
1011         u64 type = evsel->attr.sample_type;
1012         u64 regs_user = evsel->attr.sample_regs_user;
1013         bool swapped = evsel->needs_swap;
1014         const u64 *array;
1015
1016         /*
1017          * used for cross-endian analysis. See git commit 65014ab3
1018          * for why this goofiness is needed.
1019          */
1020         union u64_swap u;
1021
1022         memset(data, 0, sizeof(*data));
1023         data->cpu = data->pid = data->tid = -1;
1024         data->stream_id = data->id = data->time = -1ULL;
1025         data->period = 1;
1026         data->weight = 0;
1027
1028         if (event->header.type != PERF_RECORD_SAMPLE) {
1029                 if (!evsel->attr.sample_id_all)
1030                         return 0;
1031                 return perf_evsel__parse_id_sample(evsel, event, data);
1032         }
1033
1034         array = event->sample.array;
1035
1036         if (evsel->sample_size + sizeof(event->header) > event->header.size)
1037                 return -EFAULT;
1038
1039         if (type & PERF_SAMPLE_IP) {
1040                 data->ip = event->ip.ip;
1041                 array++;
1042         }
1043
1044         if (type & PERF_SAMPLE_TID) {
1045                 u.val64 = *array;
1046                 if (swapped) {
1047                         /* undo swap of u64, then swap on individual u32s */
1048                         u.val64 = bswap_64(u.val64);
1049                         u.val32[0] = bswap_32(u.val32[0]);
1050                         u.val32[1] = bswap_32(u.val32[1]);
1051                 }
1052
1053                 data->pid = u.val32[0];
1054                 data->tid = u.val32[1];
1055                 array++;
1056         }
1057
1058         if (type & PERF_SAMPLE_TIME) {
1059                 data->time = *array;
1060                 array++;
1061         }
1062
1063         data->addr = 0;
1064         if (type & PERF_SAMPLE_ADDR) {
1065                 data->addr = *array;
1066                 array++;
1067         }
1068
1069         data->id = -1ULL;
1070         if (type & PERF_SAMPLE_ID) {
1071                 data->id = *array;
1072                 array++;
1073         }
1074
1075         if (type & PERF_SAMPLE_STREAM_ID) {
1076                 data->stream_id = *array;
1077                 array++;
1078         }
1079
1080         if (type & PERF_SAMPLE_CPU) {
1081
1082                 u.val64 = *array;
1083                 if (swapped) {
1084                         /* undo swap of u64, then swap on individual u32s */
1085                         u.val64 = bswap_64(u.val64);
1086                         u.val32[0] = bswap_32(u.val32[0]);
1087                 }
1088
1089                 data->cpu = u.val32[0];
1090                 array++;
1091         }
1092
1093         if (type & PERF_SAMPLE_PERIOD) {
1094                 data->period = *array;
1095                 array++;
1096         }
1097
1098         if (type & PERF_SAMPLE_READ) {
1099                 fprintf(stderr, "PERF_SAMPLE_READ is unsupported for now\n");
1100                 return -1;
1101         }
1102
1103         if (type & PERF_SAMPLE_CALLCHAIN) {
1104                 if (sample_overlap(event, array, sizeof(data->callchain->nr)))
1105                         return -EFAULT;
1106
1107                 data->callchain = (struct ip_callchain *)array;
1108
1109                 if (sample_overlap(event, array, data->callchain->nr))
1110                         return -EFAULT;
1111
1112                 array += 1 + data->callchain->nr;
1113         }
1114
1115         if (type & PERF_SAMPLE_RAW) {
1116                 const u64 *pdata;
1117
1118                 u.val64 = *array;
1119                 if (WARN_ONCE(swapped,
1120                               "Endianness of raw data not corrected!\n")) {
1121                         /* undo swap of u64, then swap on individual u32s */
1122                         u.val64 = bswap_64(u.val64);
1123                         u.val32[0] = bswap_32(u.val32[0]);
1124                         u.val32[1] = bswap_32(u.val32[1]);
1125                 }
1126
1127                 if (sample_overlap(event, array, sizeof(u32)))
1128                         return -EFAULT;
1129
1130                 data->raw_size = u.val32[0];
1131                 pdata = (void *) array + sizeof(u32);
1132
1133                 if (sample_overlap(event, pdata, data->raw_size))
1134                         return -EFAULT;
1135
1136                 data->raw_data = (void *) pdata;
1137
1138                 array = (void *)array + data->raw_size + sizeof(u32);
1139         }
1140
1141         if (type & PERF_SAMPLE_BRANCH_STACK) {
1142                 u64 sz;
1143
1144                 data->branch_stack = (struct branch_stack *)array;
1145                 array++; /* nr */
1146
1147                 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1148                 sz /= sizeof(u64);
1149                 array += sz;
1150         }
1151
1152         if (type & PERF_SAMPLE_REGS_USER) {
1153                 /* First u64 tells us if we have any regs in sample. */
1154                 u64 avail = *array++;
1155
1156                 if (avail) {
1157                         data->user_regs.regs = (u64 *)array;
1158                         array += hweight_long(regs_user);
1159                 }
1160         }
1161
1162         if (type & PERF_SAMPLE_STACK_USER) {
1163                 u64 size = *array++;
1164
1165                 data->user_stack.offset = ((char *)(array - 1)
1166                                           - (char *) event);
1167
1168                 if (!size) {
1169                         data->user_stack.size = 0;
1170                 } else {
1171                         data->user_stack.data = (char *)array;
1172                         array += size / sizeof(*array);
1173                         data->user_stack.size = *array;
1174                 }
1175         }
1176
1177         data->weight = 0;
1178         if (type & PERF_SAMPLE_WEIGHT) {
1179                 data->weight = *array;
1180                 array++;
1181         }
1182
1183         data->data_src = PERF_MEM_DATA_SRC_NONE;
1184         if (type & PERF_SAMPLE_DATA_SRC) {
1185                 data->data_src = *array;
1186                 array++;
1187         }
1188
1189         return 0;
1190 }
1191
1192 int perf_event__synthesize_sample(union perf_event *event, u64 type,
1193                                   const struct perf_sample *sample,
1194                                   bool swapped)
1195 {
1196         u64 *array;
1197
1198         /*
1199          * used for cross-endian analysis. See git commit 65014ab3
1200          * for why this goofiness is needed.
1201          */
1202         union u64_swap u;
1203
1204         array = event->sample.array;
1205
1206         if (type & PERF_SAMPLE_IP) {
1207                 event->ip.ip = sample->ip;
1208                 array++;
1209         }
1210
1211         if (type & PERF_SAMPLE_TID) {
1212                 u.val32[0] = sample->pid;
1213                 u.val32[1] = sample->tid;
1214                 if (swapped) {
1215                         /*
1216                          * Inverse of what is done in perf_evsel__parse_sample
1217                          */
1218                         u.val32[0] = bswap_32(u.val32[0]);
1219                         u.val32[1] = bswap_32(u.val32[1]);
1220                         u.val64 = bswap_64(u.val64);
1221                 }
1222
1223                 *array = u.val64;
1224                 array++;
1225         }
1226
1227         if (type & PERF_SAMPLE_TIME) {
1228                 *array = sample->time;
1229                 array++;
1230         }
1231
1232         if (type & PERF_SAMPLE_ADDR) {
1233                 *array = sample->addr;
1234                 array++;
1235         }
1236
1237         if (type & PERF_SAMPLE_ID) {
1238                 *array = sample->id;
1239                 array++;
1240         }
1241
1242         if (type & PERF_SAMPLE_STREAM_ID) {
1243                 *array = sample->stream_id;
1244                 array++;
1245         }
1246
1247         if (type & PERF_SAMPLE_CPU) {
1248                 u.val32[0] = sample->cpu;
1249                 if (swapped) {
1250                         /*
1251                          * Inverse of what is done in perf_evsel__parse_sample
1252                          */
1253                         u.val32[0] = bswap_32(u.val32[0]);
1254                         u.val64 = bswap_64(u.val64);
1255                 }
1256                 *array = u.val64;
1257                 array++;
1258         }
1259
1260         if (type & PERF_SAMPLE_PERIOD) {
1261                 *array = sample->period;
1262                 array++;
1263         }
1264
1265         return 0;
1266 }
1267
1268 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
1269 {
1270         return pevent_find_field(evsel->tp_format, name);
1271 }
1272
1273 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
1274                          const char *name)
1275 {
1276         struct format_field *field = perf_evsel__field(evsel, name);
1277         int offset;
1278
1279         if (!field)
1280                 return NULL;
1281
1282         offset = field->offset;
1283
1284         if (field->flags & FIELD_IS_DYNAMIC) {
1285                 offset = *(int *)(sample->raw_data + field->offset);
1286                 offset &= 0xffff;
1287         }
1288
1289         return sample->raw_data + offset;
1290 }
1291
1292 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
1293                        const char *name)
1294 {
1295         struct format_field *field = perf_evsel__field(evsel, name);
1296         void *ptr;
1297         u64 value;
1298
1299         if (!field)
1300                 return 0;
1301
1302         ptr = sample->raw_data + field->offset;
1303
1304         switch (field->size) {
1305         case 1:
1306                 return *(u8 *)ptr;
1307         case 2:
1308                 value = *(u16 *)ptr;
1309                 break;
1310         case 4:
1311                 value = *(u32 *)ptr;
1312                 break;
1313         case 8:
1314                 value = *(u64 *)ptr;
1315                 break;
1316         default:
1317                 return 0;
1318         }
1319
1320         if (!evsel->needs_swap)
1321                 return value;
1322
1323         switch (field->size) {
1324         case 2:
1325                 return bswap_16(value);
1326         case 4:
1327                 return bswap_32(value);
1328         case 8:
1329                 return bswap_64(value);
1330         default:
1331                 return 0;
1332         }
1333
1334         return 0;
1335 }
1336
1337 static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
1338 {
1339         va_list args;
1340         int ret = 0;
1341
1342         if (!*first) {
1343                 ret += fprintf(fp, ",");
1344         } else {
1345                 ret += fprintf(fp, ":");
1346                 *first = false;
1347         }
1348
1349         va_start(args, fmt);
1350         ret += vfprintf(fp, fmt, args);
1351         va_end(args);
1352         return ret;
1353 }
1354
1355 static int __if_fprintf(FILE *fp, bool *first, const char *field, u64 value)
1356 {
1357         if (value == 0)
1358                 return 0;
1359
1360         return comma_fprintf(fp, first, " %s: %" PRIu64, field, value);
1361 }
1362
1363 #define if_print(field) printed += __if_fprintf(fp, &first, #field, evsel->attr.field)
1364
1365 struct bit_names {
1366         int bit;
1367         const char *name;
1368 };
1369
1370 static int bits__fprintf(FILE *fp, const char *field, u64 value,
1371                          struct bit_names *bits, bool *first)
1372 {
1373         int i = 0, printed = comma_fprintf(fp, first, " %s: ", field);
1374         bool first_bit = true;
1375
1376         do {
1377                 if (value & bits[i].bit) {
1378                         printed += fprintf(fp, "%s%s", first_bit ? "" : "|", bits[i].name);
1379                         first_bit = false;
1380                 }
1381         } while (bits[++i].name != NULL);
1382
1383         return printed;
1384 }
1385
1386 static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
1387 {
1388 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1389         struct bit_names bits[] = {
1390                 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1391                 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1392                 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1393                 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1394                 { .name = NULL, }
1395         };
1396 #undef bit_name
1397         return bits__fprintf(fp, "sample_type", value, bits, first);
1398 }
1399
1400 static int read_format__fprintf(FILE *fp, bool *first, u64 value)
1401 {
1402 #define bit_name(n) { PERF_FORMAT_##n, #n }
1403         struct bit_names bits[] = {
1404                 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1405                 bit_name(ID), bit_name(GROUP),
1406                 { .name = NULL, }
1407         };
1408 #undef bit_name
1409         return bits__fprintf(fp, "read_format", value, bits, first);
1410 }
1411
1412 int perf_evsel__fprintf(struct perf_evsel *evsel,
1413                         struct perf_attr_details *details, FILE *fp)
1414 {
1415         bool first = true;
1416         int printed = 0;
1417
1418         if (details->event_group) {
1419                 struct perf_evsel *pos;
1420
1421                 if (!perf_evsel__is_group_leader(evsel))
1422                         return 0;
1423
1424                 if (evsel->nr_members > 1)
1425                         printed += fprintf(fp, "%s{", evsel->group_name ?: "");
1426
1427                 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
1428                 for_each_group_member(pos, evsel)
1429                         printed += fprintf(fp, ",%s", perf_evsel__name(pos));
1430
1431                 if (evsel->nr_members > 1)
1432                         printed += fprintf(fp, "}");
1433                 goto out;
1434         }
1435
1436         printed += fprintf(fp, "%s", perf_evsel__name(evsel));
1437
1438         if (details->verbose || details->freq) {
1439                 printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
1440                                          (u64)evsel->attr.sample_freq);
1441         }
1442
1443         if (details->verbose) {
1444                 if_print(type);
1445                 if_print(config);
1446                 if_print(config1);
1447                 if_print(config2);
1448                 if_print(size);
1449                 printed += sample_type__fprintf(fp, &first, evsel->attr.sample_type);
1450                 if (evsel->attr.read_format)
1451                         printed += read_format__fprintf(fp, &first, evsel->attr.read_format);
1452                 if_print(disabled);
1453                 if_print(inherit);
1454                 if_print(pinned);
1455                 if_print(exclusive);
1456                 if_print(exclude_user);
1457                 if_print(exclude_kernel);
1458                 if_print(exclude_hv);
1459                 if_print(exclude_idle);
1460                 if_print(mmap);
1461                 if_print(comm);
1462                 if_print(freq);
1463                 if_print(inherit_stat);
1464                 if_print(enable_on_exec);
1465                 if_print(task);
1466                 if_print(watermark);
1467                 if_print(precise_ip);
1468                 if_print(mmap_data);
1469                 if_print(sample_id_all);
1470                 if_print(exclude_host);
1471                 if_print(exclude_guest);
1472                 if_print(__reserved_1);
1473                 if_print(wakeup_events);
1474                 if_print(bp_type);
1475                 if_print(branch_sample_type);
1476         }
1477 out:
1478         fputc('\n', fp);
1479         return ++printed;
1480 }
1481
1482 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
1483                           char *msg, size_t msgsize)
1484 {
1485         if ((err == ENOENT || err == ENXIO) &&
1486             evsel->attr.type   == PERF_TYPE_HARDWARE &&
1487             evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
1488                 /*
1489                  * If it's cycles then fall back to hrtimer based
1490                  * cpu-clock-tick sw counter, which is always available even if
1491                  * no PMU support.
1492                  *
1493                  * PPC returns ENXIO until 2.6.37 (behavior changed with commit
1494                  * b0a873e).
1495                  */
1496                 scnprintf(msg, msgsize, "%s",
1497 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
1498
1499                 evsel->attr.type   = PERF_TYPE_SOFTWARE;
1500                 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
1501
1502                 free(evsel->name);
1503                 evsel->name = NULL;
1504                 return true;
1505         }
1506
1507         return false;
1508 }
1509
1510 int perf_evsel__open_strerror(struct perf_evsel *evsel,
1511                               struct perf_target *target,
1512                               int err, char *msg, size_t size)
1513 {
1514         switch (err) {
1515         case EPERM:
1516         case EACCES:
1517                 return scnprintf(msg, size, "%s",
1518                  "You may not have permission to collect %sstats.\n"
1519                  "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
1520                  " -1 - Not paranoid at all\n"
1521                  "  0 - Disallow raw tracepoint access for unpriv\n"
1522                  "  1 - Disallow cpu events for unpriv\n"
1523                  "  2 - Disallow kernel profiling for unpriv",
1524                                  target->system_wide ? "system-wide " : "");
1525         case ENOENT:
1526                 return scnprintf(msg, size, "The %s event is not supported.",
1527                                  perf_evsel__name(evsel));
1528         case EMFILE:
1529                 return scnprintf(msg, size, "%s",
1530                          "Too many events are opened.\n"
1531                          "Try again after reducing the number of events.");
1532         case ENODEV:
1533                 if (target->cpu_list)
1534                         return scnprintf(msg, size, "%s",
1535          "No such device - did you specify an out-of-range profile CPU?\n");
1536                 break;
1537         case EOPNOTSUPP:
1538                 if (evsel->attr.precise_ip)
1539                         return scnprintf(msg, size, "%s",
1540         "\'precise\' request may not be supported. Try removing 'p' modifier.");
1541 #if defined(__i386__) || defined(__x86_64__)
1542                 if (evsel->attr.type == PERF_TYPE_HARDWARE)
1543                         return scnprintf(msg, size, "%s",
1544         "No hardware sampling interrupt available.\n"
1545         "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
1546 #endif
1547                 break;
1548         default:
1549                 break;
1550         }
1551
1552         return scnprintf(msg, size,
1553         "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).  \n"
1554         "/bin/dmesg may provide additional information.\n"
1555         "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
1556                          err, strerror(err), perf_evsel__name(evsel));
1557 }