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