tools/perf/util/evlist.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 #include "util.h"
  10 #include "debugfs.h"
  11 #include <poll.h>
  12 #include "cpumap.h"
  13 #include "thread_map.h"
  14 #include "target.h"
  15 #include "evlist.h"
  16 #include "evsel.h"
  17 #include <unistd.h>
  18
  19 #include "parse-events.h"
  20
  21 #include <sys/mman.h>
  22
  23 #include <linux/bitops.h>
  24 #include <linux/hash.h>
  25
  26 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  27 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
  28
  29 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
  30                        struct thread_map *threads)
  31 {
  32         int i;
  33
  34         for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  35                 INIT_HLIST_HEAD(&evlist->heads[i]);
  36         INIT_LIST_HEAD(&evlist->entries);
  37         perf_evlist__set_maps(evlist, cpus, threads);
  38         evlist->workload.pid = -1;
  39 }
  40
  41 struct perf_evlist *perf_evlist__new(struct cpu_map *cpus,
  42                                      struct thread_map *threads)
  43 {
  44         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  45
  46         if (evlist != NULL)
  47                 perf_evlist__init(evlist, cpus, threads);
  48
  49         return evlist;
  50 }
  51
  52 void perf_evlist__config_attrs(struct perf_evlist *evlist,
  53                                struct perf_record_opts *opts)
  54 {
  55         struct perf_evsel *evsel, *first;
  56
  57         if (evlist->cpus->map[0] < 0)
  58                 opts->no_inherit = true;
  59
  60         first = perf_evlist__first(evlist);
  61
  62         list_for_each_entry(evsel, &evlist->entries, node) {
  63                 perf_evsel__config(evsel, opts, first);
  64
  65                 if (evlist->nr_entries > 1)
  66                         evsel->attr.sample_type |= PERF_SAMPLE_ID;
  67         }
  68 }
  69
  70 static void perf_evlist__purge(struct perf_evlist *evlist)
  71 {
  72         struct perf_evsel *pos, *n;
  73
  74         list_for_each_entry_safe(pos, n, &evlist->entries, node) {
  75                 list_del_init(&pos->node);
  76                 perf_evsel__delete(pos);
  77         }
  78
  79         evlist->nr_entries = 0;
  80 }
  81
  82 void perf_evlist__exit(struct perf_evlist *evlist)
  83 {
  84         free(evlist->mmap);
  85         free(evlist->pollfd);
  86         evlist->mmap = NULL;
  87         evlist->pollfd = NULL;
  88 }
  89
  90 void perf_evlist__delete(struct perf_evlist *evlist)
  91 {
  92         perf_evlist__purge(evlist);
  93         perf_evlist__exit(evlist);
  94         free(evlist);
  95 }
  96
  97 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
  98 {
  99         list_add_tail(&entry->node, &evlist->entries);
 100         ++evlist->nr_entries;
 101 }
 102
 103 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 104                                    struct list_head *list,
 105                                    int nr_entries)
 106 {
 107         list_splice_tail(list, &evlist->entries);
 108         evlist->nr_entries += nr_entries;
 109 }
 110
 111 void __perf_evlist__set_leader(struct list_head *list)
 112 {
 113         struct perf_evsel *evsel, *leader;
 114
 115         leader = list_entry(list->next, struct perf_evsel, node);
 116         leader->leader = NULL;
 117
 118         list_for_each_entry(evsel, list, node) {
 119                 if (evsel != leader)
 120                         evsel->leader = leader;
 121         }
 122 }
 123
 124 void perf_evlist__set_leader(struct perf_evlist *evlist)
 125 {
 126         if (evlist->nr_entries)
 127                 __perf_evlist__set_leader(&evlist->entries);
 128 }
 129
 130 int perf_evlist__add_default(struct perf_evlist *evlist)
 131 {
 132         struct perf_event_attr attr = {
 133                 .type = PERF_TYPE_HARDWARE,
 134                 .config = PERF_COUNT_HW_CPU_CYCLES,
 135         };
 136         struct perf_evsel *evsel;
 137
 138         event_attr_init(&attr);
 139
 140         evsel = perf_evsel__new(&attr, 0);
 141         if (evsel == NULL)
 142                 goto error;
 143
 144         /* use strdup() because free(evsel) assumes name is allocated */
 145         evsel->name = strdup("cycles");
 146         if (!evsel->name)
 147                 goto error_free;
 148
 149         perf_evlist__add(evlist, evsel);
 150         return 0;
 151 error_free:
 152         perf_evsel__delete(evsel);
 153 error:
 154         return -ENOMEM;
 155 }
 156
 157 int perf_evlist__add_attrs(struct perf_evlist *evlist,
 158                            struct perf_event_attr *attrs, size_t nr_attrs)
 159 {
 160         struct perf_evsel *evsel, *n;
 161         LIST_HEAD(head);
 162         size_t i;
 163
 164         for (i = 0; i < nr_attrs; i++) {
 165                 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
 166                 if (evsel == NULL)
 167                         goto out_delete_partial_list;
 168                 list_add_tail(&evsel->node, &head);
 169         }
 170
 171         perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
 172
 173         return 0;
 174
 175 out_delete_partial_list:
 176         list_for_each_entry_safe(evsel, n, &head, node)
 177                 perf_evsel__delete(evsel);
 178         return -1;
 179 }
 180
 181 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 182                                      struct perf_event_attr *attrs, size_t nr_attrs)
 183 {
 184         size_t i;
 185
 186         for (i = 0; i < nr_attrs; i++)
 187                 event_attr_init(attrs + i);
 188
 189         return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
 190 }
 191
 192 static int trace_event__id(const char *evname)
 193 {
 194         char *filename, *colon;
 195         int err = -1, fd;
 196
 197         if (asprintf(&filename, "%s/%s/id", tracing_events_path, evname) < 0)
 198                 return -1;
 199
 200         colon = strrchr(filename, ':');
 201         if (colon != NULL)
 202                 *colon = '/';
 203
 204         fd = open(filename, O_RDONLY);
 205         if (fd >= 0) {
 206                 char id[16];
 207                 if (read(fd, id, sizeof(id)) > 0)
 208                         err = atoi(id);
 209                 close(fd);
 210         }
 211
 212         free(filename);
 213         return err;
 214 }
 215
 216 int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
 217                                  const char *tracepoints[],
 218                                  size_t nr_tracepoints)
 219 {
 220         int err;
 221         size_t i;
 222         struct perf_event_attr *attrs = zalloc(nr_tracepoints * sizeof(*attrs));
 223
 224         if (attrs == NULL)
 225                 return -1;
 226
 227         for (i = 0; i < nr_tracepoints; i++) {
 228                 err = trace_event__id(tracepoints[i]);
 229
 230                 if (err < 0)
 231                         goto out_free_attrs;
 232
 233                 attrs[i].type          = PERF_TYPE_TRACEPOINT;
 234                 attrs[i].config        = err;
 235                 attrs[i].sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 236                                           PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD);
 237                 attrs[i].sample_period = 1;
 238         }
 239
 240         err = perf_evlist__add_attrs(evlist, attrs, nr_tracepoints);
 241 out_free_attrs:
 242         free(attrs);
 243         return err;
 244 }
 245
 246 struct perf_evsel *
 247 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 248 {
 249         struct perf_evsel *evsel;
 250
 251         list_for_each_entry(evsel, &evlist->entries, node) {
 252                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 253                     (int)evsel->attr.config == id)
 254                         return evsel;
 255         }
 256
 257         return NULL;
 258 }
 259
 260 int perf_evlist__set_tracepoints_handlers(struct perf_evlist *evlist,
 261                                           const struct perf_evsel_str_handler *assocs,
 262                                           size_t nr_assocs)
 263 {
 264         struct perf_evsel *evsel;
 265         int err;
 266         size_t i;
 267
 268         for (i = 0; i < nr_assocs; i++) {
 269                 err = trace_event__id(assocs[i].name);
 270                 if (err < 0)
 271                         goto out;
 272
 273                 evsel = perf_evlist__find_tracepoint_by_id(evlist, err);
 274                 if (evsel == NULL)
 275                         continue;
 276
 277                 err = -EEXIST;
 278                 if (evsel->handler.func != NULL)
 279                         goto out;
 280                 evsel->handler.func = assocs[i].handler;
 281         }
 282
 283         err = 0;
 284 out:
 285         return err;
 286 }
 287
 288 void perf_evlist__disable(struct perf_evlist *evlist)
 289 {
 290         int cpu, thread;
 291         struct perf_evsel *pos;
 292
 293         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 294                 list_for_each_entry(pos, &evlist->entries, node) {
 295                         for (thread = 0; thread < evlist->threads->nr; thread++)
 296                                 ioctl(FD(pos, cpu, thread),
 297                                       PERF_EVENT_IOC_DISABLE, 0);
 298                 }
 299         }
 300 }
 301
 302 void perf_evlist__enable(struct perf_evlist *evlist)
 303 {
 304         int cpu, thread;
 305         struct perf_evsel *pos;
 306
 307         for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
 308                 list_for_each_entry(pos, &evlist->entries, node) {
 309                         for (thread = 0; thread < evlist->threads->nr; thread++)
 310                                 ioctl(FD(pos, cpu, thread),
 311                                       PERF_EVENT_IOC_ENABLE, 0);
 312                 }
 313         }
 314 }
 315
 316 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 317 {
 318         int nfds = cpu_map__nr(evlist->cpus) * evlist->threads->nr * evlist->nr_entries;
 319         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
 320         return evlist->pollfd != NULL ? 0 : -ENOMEM;
 321 }
 322
 323 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 324 {
 325         fcntl(fd, F_SETFL, O_NONBLOCK);
 326         evlist->pollfd[evlist->nr_fds].fd = fd;
 327         evlist->pollfd[evlist->nr_fds].events = POLLIN;
 328         evlist->nr_fds++;
 329 }
 330
 331 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 332                                  struct perf_evsel *evsel,
 333                                  int cpu, int thread, u64 id)
 334 {
 335         int hash;
 336         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 337
 338         sid->id = id;
 339         sid->evsel = evsel;
 340         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 341         hlist_add_head(&sid->node, &evlist->heads[hash]);
 342 }
 343
 344 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 345                          int cpu, int thread, u64 id)
 346 {
 347         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 348         evsel->id[evsel->ids++] = id;
 349 }
 350
 351 static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 352                                   struct perf_evsel *evsel,
 353                                   int cpu, int thread, int fd)
 354 {
 355         u64 read_data[4] = { 0, };
 356         int id_idx = 1; /* The first entry is the counter value */
 357
 358         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 359             read(fd, &read_data, sizeof(read_data)) == -1)
 360                 return -1;
 361
 362         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 363                 ++id_idx;
 364         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 365                 ++id_idx;
 366
 367         perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
 368         return 0;
 369 }
 370
 371 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 372 {
 373         struct hlist_head *head;
 374         struct hlist_node *pos;
 375         struct perf_sample_id *sid;
 376         int hash;
 377
 378         if (evlist->nr_entries == 1)
 379                 return perf_evlist__first(evlist);
 380
 381         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 382         head = &evlist->heads[hash];
 383
 384         hlist_for_each_entry(sid, pos, head, node)
 385                 if (sid->id == id)
 386                         return sid->evsel;
 387
 388         if (!perf_evlist__sample_id_all(evlist))
 389                 return perf_evlist__first(evlist);
 390
 391         return NULL;
 392 }
 393
 394 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 395 {
 396         /* XXX Move this to perf.c, making it generally available */
 397         unsigned int page_size = sysconf(_SC_PAGE_SIZE);
 398         struct perf_mmap *md = &evlist->mmap[idx];
 399         unsigned int head = perf_mmap__read_head(md);
 400         unsigned int old = md->prev;
 401         unsigned char *data = md->base + page_size;
 402         union perf_event *event = NULL;
 403
 404         if (evlist->overwrite) {
 405                 /*
 406                  * If we're further behind than half the buffer, there's a chance
 407                  * the writer will bite our tail and mess up the samples under us.
 408                  *
 409                  * If we somehow ended up ahead of the head, we got messed up.
 410                  *
 411                  * In either case, truncate and restart at head.
 412                  */
 413                 int diff = head - old;
 414                 if (diff > md->mask / 2 || diff < 0) {
 415                         fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 416
 417                         /*
 418                          * head points to a known good entry, start there.
 419                          */
 420                         old = head;
 421                 }
 422         }
 423
 424         if (old != head) {
 425                 size_t size;
 426
 427                 event = (union perf_event *)&data[old & md->mask];
 428                 size = event->header.size;
 429
 430                 /*
 431                  * Event straddles the mmap boundary -- header should always
 432                  * be inside due to u64 alignment of output.
 433                  */
 434                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 435                         unsigned int offset = old;
 436                         unsigned int len = min(sizeof(*event), size), cpy;
 437                         void *dst = &evlist->event_copy;
 438
 439                         do {
 440                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 441                                 memcpy(dst, &data[offset & md->mask], cpy);
 442                                 offset += cpy;
 443                                 dst += cpy;
 444                                 len -= cpy;
 445                         } while (len);
 446
 447                         event = &evlist->event_copy;
 448                 }
 449
 450                 old += size;
 451         }
 452
 453         md->prev = old;
 454
 455         if (!evlist->overwrite)
 456                 perf_mmap__write_tail(md, old);
 457
 458         return event;
 459 }
 460
 461 void perf_evlist__munmap(struct perf_evlist *evlist)
 462 {
 463         int i;
 464
 465         for (i = 0; i < evlist->nr_mmaps; i++) {
 466                 if (evlist->mmap[i].base != NULL) {
 467                         munmap(evlist->mmap[i].base, evlist->mmap_len);
 468                         evlist->mmap[i].base = NULL;
 469                 }
 470         }
 471
 472         free(evlist->mmap);
 473         evlist->mmap = NULL;
 474 }
 475
 476 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 477 {
 478         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 479         if (cpu_map__all(evlist->cpus))
 480                 evlist->nr_mmaps = evlist->threads->nr;
 481         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 482         return evlist->mmap != NULL ? 0 : -ENOMEM;
 483 }
 484
 485 static int __perf_evlist__mmap(struct perf_evlist *evlist,
 486                                int idx, int prot, int mask, int fd)
 487 {
 488         evlist->mmap[idx].prev = 0;
 489         evlist->mmap[idx].mask = mask;
 490         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 491                                       MAP_SHARED, fd, 0);
 492         if (evlist->mmap[idx].base == MAP_FAILED) {
 493                 evlist->mmap[idx].base = NULL;
 494                 return -1;
 495         }
 496
 497         perf_evlist__add_pollfd(evlist, fd);
 498         return 0;
 499 }
 500
 501 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
 502 {
 503         struct perf_evsel *evsel;
 504         int cpu, thread;
 505
 506         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 507                 int output = -1;
 508
 509                 for (thread = 0; thread < evlist->threads->nr; thread++) {
 510                         list_for_each_entry(evsel, &evlist->entries, node) {
 511                                 int fd = FD(evsel, cpu, thread);
 512
 513                                 if (output == -1) {
 514                                         output = fd;
 515                                         if (__perf_evlist__mmap(evlist, cpu,
 516                                                                 prot, mask, output) < 0)
 517                                                 goto out_unmap;
 518                                 } else {
 519                                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 520                                                 goto out_unmap;
 521                                 }
 522
 523                                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 524                                     perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
 525                                         goto out_unmap;
 526                         }
 527                 }
 528         }
 529
 530         return 0;
 531
 532 out_unmap:
 533         for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
 534                 if (evlist->mmap[cpu].base != NULL) {
 535                         munmap(evlist->mmap[cpu].base, evlist->mmap_len);
 536                         evlist->mmap[cpu].base = NULL;
 537                 }
 538         }
 539         return -1;
 540 }
 541
 542 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
 543 {
 544         struct perf_evsel *evsel;
 545         int thread;
 546
 547         for (thread = 0; thread < evlist->threads->nr; thread++) {
 548                 int output = -1;
 549
 550                 list_for_each_entry(evsel, &evlist->entries, node) {
 551                         int fd = FD(evsel, 0, thread);
 552
 553                         if (output == -1) {
 554                                 output = fd;
 555                                 if (__perf_evlist__mmap(evlist, thread,
 556                                                         prot, mask, output) < 0)
 557                                         goto out_unmap;
 558                         } else {
 559                                 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
 560                                         goto out_unmap;
 561                         }
 562
 563                         if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 564                             perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
 565                                 goto out_unmap;
 566                 }
 567         }
 568
 569         return 0;
 570
 571 out_unmap:
 572         for (thread = 0; thread < evlist->threads->nr; thread++) {
 573                 if (evlist->mmap[thread].base != NULL) {
 574                         munmap(evlist->mmap[thread].base, evlist->mmap_len);
 575                         evlist->mmap[thread].base = NULL;
 576                 }
 577         }
 578         return -1;
 579 }
 580
 581 /** perf_evlist__mmap - Create per cpu maps to receive events
 582  *
 583  * @evlist - list of events
 584  * @pages - map length in pages
 585  * @overwrite - overwrite older events?
 586  *
 587  * If overwrite is false the user needs to signal event consuption using:
 588  *
 589  *      struct perf_mmap *m = &evlist->mmap[cpu];
 590  *      unsigned int head = perf_mmap__read_head(m);
 591  *
 592  *      perf_mmap__write_tail(m, head)
 593  *
 594  * Using perf_evlist__read_on_cpu does this automatically.
 595  */
 596 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 597                       bool overwrite)
 598 {
 599         unsigned int page_size = sysconf(_SC_PAGE_SIZE);
 600         struct perf_evsel *evsel;
 601         const struct cpu_map *cpus = evlist->cpus;
 602         const struct thread_map *threads = evlist->threads;
 603         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 604
 605         /* 512 kiB: default amount of unprivileged mlocked memory */
 606         if (pages == UINT_MAX)
 607                 pages = (512 * 1024) / page_size;
 608         else if (!is_power_of_2(pages))
 609                 return -EINVAL;
 610
 611         mask = pages * page_size - 1;
 612
 613         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
 614                 return -ENOMEM;
 615
 616         if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
 617                 return -ENOMEM;
 618
 619         evlist->overwrite = overwrite;
 620         evlist->mmap_len = (pages + 1) * page_size;
 621
 622         list_for_each_entry(evsel, &evlist->entries, node) {
 623                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
 624                     evsel->sample_id == NULL &&
 625                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
 626                         return -ENOMEM;
 627         }
 628
 629         if (cpu_map__all(cpus))
 630                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 631
 632         return perf_evlist__mmap_per_cpu(evlist, prot, mask);
 633 }
 634
 635 int perf_evlist__create_maps(struct perf_evlist *evlist,
 636                              struct perf_target *target)
 637 {
 638         evlist->threads = thread_map__new_str(target->pid, target->tid,
 639                                               target->uid);
 640
 641         if (evlist->threads == NULL)
 642                 return -1;
 643
 644         if (perf_target__has_task(target))
 645                 evlist->cpus = cpu_map__dummy_new();
 646         else if (!perf_target__has_cpu(target) && !target->uses_mmap)
 647                 evlist->cpus = cpu_map__dummy_new();
 648         else
 649                 evlist->cpus = cpu_map__new(target->cpu_list);
 650
 651         if (evlist->cpus == NULL)
 652                 goto out_delete_threads;
 653
 654         return 0;
 655
 656 out_delete_threads:
 657         thread_map__delete(evlist->threads);
 658         return -1;
 659 }
 660
 661 void perf_evlist__delete_maps(struct perf_evlist *evlist)
 662 {
 663         cpu_map__delete(evlist->cpus);
 664         thread_map__delete(evlist->threads);
 665         evlist->cpus    = NULL;
 666         evlist->threads = NULL;
 667 }
 668
 669 int perf_evlist__set_filters(struct perf_evlist *evlist)
 670 {
 671         const struct thread_map *threads = evlist->threads;
 672         const struct cpu_map *cpus = evlist->cpus;
 673         struct perf_evsel *evsel;
 674         char *filter;
 675         int thread;
 676         int cpu;
 677         int err;
 678         int fd;
 679
 680         list_for_each_entry(evsel, &evlist->entries, node) {
 681                 filter = evsel->filter;
 682                 if (!filter)
 683                         continue;
 684                 for (cpu = 0; cpu < cpus->nr; cpu++) {
 685                         for (thread = 0; thread < threads->nr; thread++) {
 686                                 fd = FD(evsel, cpu, thread);
 687                                 err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
 688                                 if (err)
 689                                         return err;
 690                         }
 691                 }
 692         }
 693
 694         return 0;
 695 }
 696
 697 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 698 {
 699         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 700
 701         list_for_each_entry_continue(pos, &evlist->entries, node) {
 702                 if (first->attr.sample_type != pos->attr.sample_type)
 703                         return false;
 704         }
 705
 706         return true;
 707 }
 708
 709 u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 710 {
 711         struct perf_evsel *first = perf_evlist__first(evlist);
 712         return first->attr.sample_type;
 713 }
 714
 715 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
 716 {
 717         struct perf_evsel *first = perf_evlist__first(evlist);
 718         struct perf_sample *data;
 719         u64 sample_type;
 720         u16 size = 0;
 721
 722         if (!first->attr.sample_id_all)
 723                 goto out;
 724
 725         sample_type = first->attr.sample_type;
 726
 727         if (sample_type & PERF_SAMPLE_TID)
 728                 size += sizeof(data->tid) * 2;
 729
 730        if (sample_type & PERF_SAMPLE_TIME)
 731                 size += sizeof(data->time);
 732
 733         if (sample_type & PERF_SAMPLE_ID)
 734                 size += sizeof(data->id);
 735
 736         if (sample_type & PERF_SAMPLE_STREAM_ID)
 737                 size += sizeof(data->stream_id);
 738
 739         if (sample_type & PERF_SAMPLE_CPU)
 740                 size += sizeof(data->cpu) * 2;
 741 out:
 742         return size;
 743 }
 744
 745 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
 746 {
 747         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
 748
 749         list_for_each_entry_continue(pos, &evlist->entries, node) {
 750                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
 751                         return false;
 752         }
 753
 754         return true;
 755 }
 756
 757 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
 758 {
 759         struct perf_evsel *first = perf_evlist__first(evlist);
 760         return first->attr.sample_id_all;
 761 }
 762
 763 void perf_evlist__set_selected(struct perf_evlist *evlist,
 764                                struct perf_evsel *evsel)
 765 {
 766         evlist->selected = evsel;
 767 }
 768
 769 int perf_evlist__open(struct perf_evlist *evlist)
 770 {
 771         struct perf_evsel *evsel;
 772         int err, ncpus, nthreads;
 773
 774         list_for_each_entry(evsel, &evlist->entries, node) {
 775                 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
 776                 if (err < 0)
 777                         goto out_err;
 778         }
 779
 780         return 0;
 781 out_err:
 782         ncpus = evlist->cpus ? evlist->cpus->nr : 1;
 783         nthreads = evlist->threads ? evlist->threads->nr : 1;
 784
 785         list_for_each_entry_reverse(evsel, &evlist->entries, node)
 786                 perf_evsel__close(evsel, ncpus, nthreads);
 787
 788         errno = -err;
 789         return err;
 790 }
 791
 792 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 793                                   struct perf_record_opts *opts,
 794                                   const char *argv[])
 795 {
 796         int child_ready_pipe[2], go_pipe[2];
 797         char bf;
 798
 799         if (pipe(child_ready_pipe) < 0) {
 800                 perror("failed to create 'ready' pipe");
 801                 return -1;
 802         }
 803
 804         if (pipe(go_pipe) < 0) {
 805                 perror("failed to create 'go' pipe");
 806                 goto out_close_ready_pipe;
 807         }
 808
 809         evlist->workload.pid = fork();
 810         if (evlist->workload.pid < 0) {
 811                 perror("failed to fork");
 812                 goto out_close_pipes;
 813         }
 814
 815         if (!evlist->workload.pid) {
 816                 if (opts->pipe_output)
 817                         dup2(2, 1);
 818
 819                 close(child_ready_pipe[0]);
 820                 close(go_pipe[1]);
 821                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 822
 823                 /*
 824                  * Do a dummy execvp to get the PLT entry resolved,
 825                  * so we avoid the resolver overhead on the real
 826                  * execvp call.
 827                  */
 828                 execvp("", (char **)argv);
 829
 830                 /*
 831                  * Tell the parent we're ready to go
 832                  */
 833                 close(child_ready_pipe[1]);
 834
 835                 /*
 836                  * Wait until the parent tells us to go.
 837                  */
 838                 if (read(go_pipe[0], &bf, 1) == -1)
 839                         perror("unable to read pipe");
 840
 841                 execvp(argv[0], (char **)argv);
 842
 843                 perror(argv[0]);
 844                 kill(getppid(), SIGUSR1);
 845                 exit(-1);
 846         }
 847
 848         if (perf_target__none(&opts->target))
 849                 evlist->threads->map[0] = evlist->workload.pid;
 850
 851         close(child_ready_pipe[1]);
 852         close(go_pipe[0]);
 853         /*
 854          * wait for child to settle
 855          */
 856         if (read(child_ready_pipe[0], &bf, 1) == -1) {
 857                 perror("unable to read pipe");
 858                 goto out_close_pipes;
 859         }
 860
 861         evlist->workload.cork_fd = go_pipe[1];
 862         close(child_ready_pipe[0]);
 863         return 0;
 864
 865 out_close_pipes:
 866         close(go_pipe[0]);
 867         close(go_pipe[1]);
 868 out_close_ready_pipe:
 869         close(child_ready_pipe[0]);
 870         close(child_ready_pipe[1]);
 871         return -1;
 872 }
 873
 874 int perf_evlist__start_workload(struct perf_evlist *evlist)
 875 {
 876         if (evlist->workload.cork_fd > 0) {
 877                 /*
 878                  * Remove the cork, let it rip!
 879                  */
 880                 return close(evlist->workload.cork_fd);
 881         }
 882
 883         return 0;
 884 }
 885
 886 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
 887                               struct perf_sample *sample)
 888 {
 889         struct perf_evsel *evsel = perf_evlist__first(evlist);
 890         return perf_evsel__parse_sample(evsel, event, sample);
 891 }
 892
 893 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 894 {
 895         struct perf_evsel *evsel;
 896         size_t printed = 0;
 897
 898         list_for_each_entry(evsel, &evlist->entries, node) {
 899                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
 900                                    perf_evsel__name(evsel));
 901         }
 902
 903         return printed + fprintf(fp, "\n");;
 904 }