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 <api/fs/fs.h>
  11 #include <errno.h>
  12 #include <inttypes.h>
  13 #include <poll.h>
  14 #include "cpumap.h"
  15 #include "thread_map.h"
  16 #include "target.h"
  17 #include "evlist.h"
  18 #include "evsel.h"
  19 #include "debug.h"
  20 #include "units.h"
  21 #include "asm/bug.h"
  22 #include <signal.h>
  23 #include <unistd.h>
  24
  25 #include "parse-events.h"
  26 #include <subcmd/parse-options.h>
  27
  28 #include <fcntl.h>
  29 #include <sys/ioctl.h>
  30 #include <sys/mman.h>
  31
  32 #include <linux/bitops.h>
  33 #include <linux/hash.h>
  34 #include <linux/log2.h>
  35 #include <linux/err.h>
  36
  37 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  38 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
  39
  40 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
  41                        struct thread_map *threads)
  42 {
  43         int i;
  44
  45         for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  46                 INIT_HLIST_HEAD(&evlist->heads[i]);
  47         INIT_LIST_HEAD(&evlist->entries);
  48         perf_evlist__set_maps(evlist, cpus, threads);
  49         fdarray__init(&evlist->pollfd, 64);
  50         evlist->workload.pid = -1;
  51         evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
  52 }
  53
  54 struct perf_evlist *perf_evlist__new(void)
  55 {
  56         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  57
  58         if (evlist != NULL)
  59                 perf_evlist__init(evlist, NULL, NULL);
  60
  61         return evlist;
  62 }
  63
  64 struct perf_evlist *perf_evlist__new_default(void)
  65 {
  66         struct perf_evlist *evlist = perf_evlist__new();
  67
  68         if (evlist && perf_evlist__add_default(evlist)) {
  69                 perf_evlist__delete(evlist);
  70                 evlist = NULL;
  71         }
  72
  73         return evlist;
  74 }
  75
  76 struct perf_evlist *perf_evlist__new_dummy(void)
  77 {
  78         struct perf_evlist *evlist = perf_evlist__new();
  79
  80         if (evlist && perf_evlist__add_dummy(evlist)) {
  81                 perf_evlist__delete(evlist);
  82                 evlist = NULL;
  83         }
  84
  85         return evlist;
  86 }
  87
  88 /**
  89  * perf_evlist__set_id_pos - set the positions of event ids.
  90  * @evlist: selected event list
  91  *
  92  * Events with compatible sample types all have the same id_pos
  93  * and is_pos.  For convenience, put a copy on evlist.
  94  */
  95 void perf_evlist__set_id_pos(struct perf_evlist *evlist)
  96 {
  97         struct perf_evsel *first = perf_evlist__first(evlist);
  98
  99         evlist->id_pos = first->id_pos;
 100         evlist->is_pos = first->is_pos;
 101 }
 102
 103 static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
 104 {
 105         struct perf_evsel *evsel;
 106
 107         evlist__for_each_entry(evlist, evsel)
 108                 perf_evsel__calc_id_pos(evsel);
 109
 110         perf_evlist__set_id_pos(evlist);
 111 }
 112
 113 static void perf_evlist__purge(struct perf_evlist *evlist)
 114 {
 115         struct perf_evsel *pos, *n;
 116
 117         evlist__for_each_entry_safe(evlist, n, pos) {
 118                 list_del_init(&pos->node);
 119                 pos->evlist = NULL;
 120                 perf_evsel__delete(pos);
 121         }
 122
 123         evlist->nr_entries = 0;
 124 }
 125
 126 void perf_evlist__exit(struct perf_evlist *evlist)
 127 {
 128         zfree(&evlist->mmap);
 129         zfree(&evlist->overwrite_mmap);
 130         fdarray__exit(&evlist->pollfd);
 131 }
 132
 133 void perf_evlist__delete(struct perf_evlist *evlist)
 134 {
 135         if (evlist == NULL)
 136                 return;
 137
 138         perf_evlist__munmap(evlist);
 139         perf_evlist__close(evlist);
 140         cpu_map__put(evlist->cpus);
 141         thread_map__put(evlist->threads);
 142         evlist->cpus = NULL;
 143         evlist->threads = NULL;
 144         perf_evlist__purge(evlist);
 145         perf_evlist__exit(evlist);
 146         free(evlist);
 147 }
 148
 149 static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
 150                                           struct perf_evsel *evsel)
 151 {
 152         /*
 153          * We already have cpus for evsel (via PMU sysfs) so
 154          * keep it, if there's no target cpu list defined.
 155          */
 156         if (!evsel->own_cpus || evlist->has_user_cpus) {
 157                 cpu_map__put(evsel->cpus);
 158                 evsel->cpus = cpu_map__get(evlist->cpus);
 159         } else if (evsel->cpus != evsel->own_cpus) {
 160                 cpu_map__put(evsel->cpus);
 161                 evsel->cpus = cpu_map__get(evsel->own_cpus);
 162         }
 163
 164         thread_map__put(evsel->threads);
 165         evsel->threads = thread_map__get(evlist->threads);
 166 }
 167
 168 static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
 169 {
 170         struct perf_evsel *evsel;
 171
 172         evlist__for_each_entry(evlist, evsel)
 173                 __perf_evlist__propagate_maps(evlist, evsel);
 174 }
 175
 176 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
 177 {
 178         entry->evlist = evlist;
 179         list_add_tail(&entry->node, &evlist->entries);
 180         entry->idx = evlist->nr_entries;
 181         entry->tracking = !entry->idx;
 182
 183         if (!evlist->nr_entries++)
 184                 perf_evlist__set_id_pos(evlist);
 185
 186         __perf_evlist__propagate_maps(evlist, entry);
 187 }
 188
 189 void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
 190 {
 191         evsel->evlist = NULL;
 192         list_del_init(&evsel->node);
 193         evlist->nr_entries -= 1;
 194 }
 195
 196 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 197                                    struct list_head *list)
 198 {
 199         struct perf_evsel *evsel, *temp;
 200
 201         __evlist__for_each_entry_safe(list, temp, evsel) {
 202                 list_del_init(&evsel->node);
 203                 perf_evlist__add(evlist, evsel);
 204         }
 205 }
 206
 207 void __perf_evlist__set_leader(struct list_head *list)
 208 {
 209         struct perf_evsel *evsel, *leader;
 210
 211         leader = list_entry(list->next, struct perf_evsel, node);
 212         evsel = list_entry(list->prev, struct perf_evsel, node);
 213
 214         leader->nr_members = evsel->idx - leader->idx + 1;
 215
 216         __evlist__for_each_entry(list, evsel) {
 217                 evsel->leader = leader;
 218         }
 219 }
 220
 221 void perf_evlist__set_leader(struct perf_evlist *evlist)
 222 {
 223         if (evlist->nr_entries) {
 224                 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
 225                 __perf_evlist__set_leader(&evlist->entries);
 226         }
 227 }
 228
 229 void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr)
 230 {
 231         attr->precise_ip = 3;
 232
 233         while (attr->precise_ip != 0) {
 234                 int fd = sys_perf_event_open(attr, 0, -1, -1, 0);
 235                 if (fd != -1) {
 236                         close(fd);
 237                         break;
 238                 }
 239                 --attr->precise_ip;
 240         }
 241 }
 242
 243 int __perf_evlist__add_default(struct perf_evlist *evlist, bool precise)
 244 {
 245         struct perf_evsel *evsel = perf_evsel__new_cycles(precise);
 246
 247         if (evsel == NULL)
 248                 return -ENOMEM;
 249
 250         perf_evlist__add(evlist, evsel);
 251         return 0;
 252 }
 253
 254 int perf_evlist__add_dummy(struct perf_evlist *evlist)
 255 {
 256         struct perf_event_attr attr = {
 257                 .type   = PERF_TYPE_SOFTWARE,
 258                 .config = PERF_COUNT_SW_DUMMY,
 259                 .size   = sizeof(attr), /* to capture ABI version */
 260         };
 261         struct perf_evsel *evsel = perf_evsel__new_idx(&attr, evlist->nr_entries);
 262
 263         if (evsel == NULL)
 264                 return -ENOMEM;
 265
 266         perf_evlist__add(evlist, evsel);
 267         return 0;
 268 }
 269
 270 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
 271                                   struct perf_event_attr *attrs, size_t nr_attrs)
 272 {
 273         struct perf_evsel *evsel, *n;
 274         LIST_HEAD(head);
 275         size_t i;
 276
 277         for (i = 0; i < nr_attrs; i++) {
 278                 evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
 279                 if (evsel == NULL)
 280                         goto out_delete_partial_list;
 281                 list_add_tail(&evsel->node, &head);
 282         }
 283
 284         perf_evlist__splice_list_tail(evlist, &head);
 285
 286         return 0;
 287
 288 out_delete_partial_list:
 289         __evlist__for_each_entry_safe(&head, n, evsel)
 290                 perf_evsel__delete(evsel);
 291         return -1;
 292 }
 293
 294 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 295                                      struct perf_event_attr *attrs, size_t nr_attrs)
 296 {
 297         size_t i;
 298
 299         for (i = 0; i < nr_attrs; i++)
 300                 event_attr_init(attrs + i);
 301
 302         return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
 303 }
 304
 305 struct perf_evsel *
 306 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 307 {
 308         struct perf_evsel *evsel;
 309
 310         evlist__for_each_entry(evlist, evsel) {
 311                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 312                     (int)evsel->attr.config == id)
 313                         return evsel;
 314         }
 315
 316         return NULL;
 317 }
 318
 319 struct perf_evsel *
 320 perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
 321                                      const char *name)
 322 {
 323         struct perf_evsel *evsel;
 324
 325         evlist__for_each_entry(evlist, evsel) {
 326                 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
 327                     (strcmp(evsel->name, name) == 0))
 328                         return evsel;
 329         }
 330
 331         return NULL;
 332 }
 333
 334 int perf_evlist__add_newtp(struct perf_evlist *evlist,
 335                            const char *sys, const char *name, void *handler)
 336 {
 337         struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
 338
 339         if (IS_ERR(evsel))
 340                 return -1;
 341
 342         evsel->handler = handler;
 343         perf_evlist__add(evlist, evsel);
 344         return 0;
 345 }
 346
 347 static int perf_evlist__nr_threads(struct perf_evlist *evlist,
 348                                    struct perf_evsel *evsel)
 349 {
 350         if (evsel->system_wide)
 351                 return 1;
 352         else
 353                 return thread_map__nr(evlist->threads);
 354 }
 355
 356 void perf_evlist__disable(struct perf_evlist *evlist)
 357 {
 358         struct perf_evsel *pos;
 359
 360         evlist__for_each_entry(evlist, pos) {
 361                 if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->fd)
 362                         continue;
 363                 perf_evsel__disable(pos);
 364         }
 365
 366         evlist->enabled = false;
 367 }
 368
 369 void perf_evlist__enable(struct perf_evlist *evlist)
 370 {
 371         struct perf_evsel *pos;
 372
 373         evlist__for_each_entry(evlist, pos) {
 374                 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
 375                         continue;
 376                 perf_evsel__enable(pos);
 377         }
 378
 379         evlist->enabled = true;
 380 }
 381
 382 void perf_evlist__toggle_enable(struct perf_evlist *evlist)
 383 {
 384         (evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist);
 385 }
 386
 387 static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
 388                                          struct perf_evsel *evsel, int cpu)
 389 {
 390         int thread;
 391         int nr_threads = perf_evlist__nr_threads(evlist, evsel);
 392
 393         if (!evsel->fd)
 394                 return -EINVAL;
 395
 396         for (thread = 0; thread < nr_threads; thread++) {
 397                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 398                 if (err)
 399                         return err;
 400         }
 401         return 0;
 402 }
 403
 404 static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
 405                                             struct perf_evsel *evsel,
 406                                             int thread)
 407 {
 408         int cpu;
 409         int nr_cpus = cpu_map__nr(evlist->cpus);
 410
 411         if (!evsel->fd)
 412                 return -EINVAL;
 413
 414         for (cpu = 0; cpu < nr_cpus; cpu++) {
 415                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 416                 if (err)
 417                         return err;
 418         }
 419         return 0;
 420 }
 421
 422 int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
 423                                   struct perf_evsel *evsel, int idx)
 424 {
 425         bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
 426
 427         if (per_cpu_mmaps)
 428                 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
 429         else
 430                 return perf_evlist__enable_event_thread(evlist, evsel, idx);
 431 }
 432
 433 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 434 {
 435         int nr_cpus = cpu_map__nr(evlist->cpus);
 436         int nr_threads = thread_map__nr(evlist->threads);
 437         int nfds = 0;
 438         struct perf_evsel *evsel;
 439
 440         evlist__for_each_entry(evlist, evsel) {
 441                 if (evsel->system_wide)
 442                         nfds += nr_cpus;
 443                 else
 444                         nfds += nr_cpus * nr_threads;
 445         }
 446
 447         if (fdarray__available_entries(&evlist->pollfd) < nfds &&
 448             fdarray__grow(&evlist->pollfd, nfds) < 0)
 449                 return -ENOMEM;
 450
 451         return 0;
 452 }
 453
 454 static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
 455                                      struct perf_mmap *map, short revent)
 456 {
 457         int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
 458         /*
 459          * Save the idx so that when we filter out fds POLLHUP'ed we can
 460          * close the associated evlist->mmap[] entry.
 461          */
 462         if (pos >= 0) {
 463                 evlist->pollfd.priv[pos].ptr = map;
 464
 465                 fcntl(fd, F_SETFL, O_NONBLOCK);
 466         }
 467
 468         return pos;
 469 }
 470
 471 int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 472 {
 473         return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
 474 }
 475
 476 static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
 477                                          void *arg __maybe_unused)
 478 {
 479         struct perf_mmap *map = fda->priv[fd].ptr;
 480
 481         if (map)
 482                 perf_mmap__put(map);
 483 }
 484
 485 int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
 486 {
 487         return fdarray__filter(&evlist->pollfd, revents_and_mask,
 488                                perf_evlist__munmap_filtered, NULL);
 489 }
 490
 491 int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
 492 {
 493         return fdarray__poll(&evlist->pollfd, timeout);
 494 }
 495
 496 static void perf_evlist__id_hash(struct perf_evlist *evlist,
 497                                  struct perf_evsel *evsel,
 498                                  int cpu, int thread, u64 id)
 499 {
 500         int hash;
 501         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 502
 503         sid->id = id;
 504         sid->evsel = evsel;
 505         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 506         hlist_add_head(&sid->node, &evlist->heads[hash]);
 507 }
 508
 509 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 510                          int cpu, int thread, u64 id)
 511 {
 512         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 513         evsel->id[evsel->ids++] = id;
 514 }
 515
 516 int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 517                            struct perf_evsel *evsel,
 518                            int cpu, int thread, int fd)
 519 {
 520         u64 read_data[4] = { 0, };
 521         int id_idx = 1; /* The first entry is the counter value */
 522         u64 id;
 523         int ret;
 524
 525         ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
 526         if (!ret)
 527                 goto add;
 528
 529         if (errno != ENOTTY)
 530                 return -1;
 531
 532         /* Legacy way to get event id.. All hail to old kernels! */
 533
 534         /*
 535          * This way does not work with group format read, so bail
 536          * out in that case.
 537          */
 538         if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
 539                 return -1;
 540
 541         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 542             read(fd, &read_data, sizeof(read_data)) == -1)
 543                 return -1;
 544
 545         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 546                 ++id_idx;
 547         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 548                 ++id_idx;
 549
 550         id = read_data[id_idx];
 551
 552  add:
 553         perf_evlist__id_add(evlist, evsel, cpu, thread, id);
 554         return 0;
 555 }
 556
 557 static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
 558                                      struct perf_evsel *evsel, int idx, int cpu,
 559                                      int thread)
 560 {
 561         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 562         sid->idx = idx;
 563         if (evlist->cpus && cpu >= 0)
 564                 sid->cpu = evlist->cpus->map[cpu];
 565         else
 566                 sid->cpu = -1;
 567         if (!evsel->system_wide && evlist->threads && thread >= 0)
 568                 sid->tid = thread_map__pid(evlist->threads, thread);
 569         else
 570                 sid->tid = -1;
 571 }
 572
 573 struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
 574 {
 575         struct hlist_head *head;
 576         struct perf_sample_id *sid;
 577         int hash;
 578
 579         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 580         head = &evlist->heads[hash];
 581
 582         hlist_for_each_entry(sid, head, node)
 583                 if (sid->id == id)
 584                         return sid;
 585
 586         return NULL;
 587 }
 588
 589 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 590 {
 591         struct perf_sample_id *sid;
 592
 593         if (evlist->nr_entries == 1 || !id)
 594                 return perf_evlist__first(evlist);
 595
 596         sid = perf_evlist__id2sid(evlist, id);
 597         if (sid)
 598                 return sid->evsel;
 599
 600         if (!perf_evlist__sample_id_all(evlist))
 601                 return perf_evlist__first(evlist);
 602
 603         return NULL;
 604 }
 605
 606 struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
 607                                                 u64 id)
 608 {
 609         struct perf_sample_id *sid;
 610
 611         if (!id)
 612                 return NULL;
 613
 614         sid = perf_evlist__id2sid(evlist, id);
 615         if (sid)
 616                 return sid->evsel;
 617
 618         return NULL;
 619 }
 620
 621 static int perf_evlist__event2id(struct perf_evlist *evlist,
 622                                  union perf_event *event, u64 *id)
 623 {
 624         const u64 *array = event->sample.array;
 625         ssize_t n;
 626
 627         n = (event->header.size - sizeof(event->header)) >> 3;
 628
 629         if (event->header.type == PERF_RECORD_SAMPLE) {
 630                 if (evlist->id_pos >= n)
 631                         return -1;
 632                 *id = array[evlist->id_pos];
 633         } else {
 634                 if (evlist->is_pos > n)
 635                         return -1;
 636                 n -= evlist->is_pos;
 637                 *id = array[n];
 638         }
 639         return 0;
 640 }
 641
 642 struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
 643                                             union perf_event *event)
 644 {
 645         struct perf_evsel *first = perf_evlist__first(evlist);
 646         struct hlist_head *head;
 647         struct perf_sample_id *sid;
 648         int hash;
 649         u64 id;
 650
 651         if (evlist->nr_entries == 1)
 652                 return first;
 653
 654         if (!first->attr.sample_id_all &&
 655             event->header.type != PERF_RECORD_SAMPLE)
 656                 return first;
 657
 658         if (perf_evlist__event2id(evlist, event, &id))
 659                 return NULL;
 660
 661         /* Synthesized events have an id of zero */
 662         if (!id)
 663                 return first;
 664
 665         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 666         head = &evlist->heads[hash];
 667
 668         hlist_for_each_entry(sid, head, node) {
 669                 if (sid->id == id)
 670                         return sid->evsel;
 671         }
 672         return NULL;
 673 }
 674
 675 static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
 676 {
 677         int i;
 678
 679         if (!evlist->overwrite_mmap)
 680                 return 0;
 681
 682         for (i = 0; i < evlist->nr_mmaps; i++) {
 683                 int fd = evlist->overwrite_mmap[i].fd;
 684                 int err;
 685
 686                 if (fd < 0)
 687                         continue;
 688                 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
 689                 if (err)
 690                         return err;
 691         }
 692         return 0;
 693 }
 694
 695 static int perf_evlist__pause(struct perf_evlist *evlist)
 696 {
 697         return perf_evlist__set_paused(evlist, true);
 698 }
 699
 700 static int perf_evlist__resume(struct perf_evlist *evlist)
 701 {
 702         return perf_evlist__set_paused(evlist, false);
 703 }
 704
 705 static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
 706 {
 707         int i;
 708
 709         if (evlist->mmap)
 710                 for (i = 0; i < evlist->nr_mmaps; i++)
 711                         perf_mmap__munmap(&evlist->mmap[i]);
 712
 713         if (evlist->overwrite_mmap)
 714                 for (i = 0; i < evlist->nr_mmaps; i++)
 715                         perf_mmap__munmap(&evlist->overwrite_mmap[i]);
 716 }
 717
 718 void perf_evlist__munmap(struct perf_evlist *evlist)
 719 {
 720         perf_evlist__munmap_nofree(evlist);
 721         zfree(&evlist->mmap);
 722         zfree(&evlist->overwrite_mmap);
 723 }
 724
 725 static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist,
 726                                                  bool overwrite)
 727 {
 728         int i;
 729         struct perf_mmap *map;
 730
 731         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 732         if (cpu_map__empty(evlist->cpus))
 733                 evlist->nr_mmaps = thread_map__nr(evlist->threads);
 734         map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 735         if (!map)
 736                 return NULL;
 737
 738         for (i = 0; i < evlist->nr_mmaps; i++) {
 739                 map[i].fd = -1;
 740                 map[i].overwrite = overwrite;
 741                 /*
 742                  * When the perf_mmap() call is made we grab one refcount, plus
 743                  * one extra to let perf_mmap__consume() get the last
 744                  * events after all real references (perf_mmap__get()) are
 745                  * dropped.
 746                  *
 747                  * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 748                  * thus does perf_mmap__get() on it.
 749                  */
 750                 refcount_set(&map[i].refcnt, 0);
 751         }
 752         return map;
 753 }
 754
 755 static bool
 756 perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
 757                          struct perf_evsel *evsel)
 758 {
 759         if (evsel->attr.write_backward)
 760                 return false;
 761         return true;
 762 }
 763
 764 static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
 765                                        struct mmap_params *mp, int cpu_idx,
 766                                        int thread, int *_output, int *_output_overwrite)
 767 {
 768         struct perf_evsel *evsel;
 769         int revent;
 770         int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
 771
 772         evlist__for_each_entry(evlist, evsel) {
 773                 struct perf_mmap *maps = evlist->mmap;
 774                 int *output = _output;
 775                 int fd;
 776                 int cpu;
 777
 778                 mp->prot = PROT_READ | PROT_WRITE;
 779                 if (evsel->attr.write_backward) {
 780                         output = _output_overwrite;
 781                         maps = evlist->overwrite_mmap;
 782
 783                         if (!maps) {
 784                                 maps = perf_evlist__alloc_mmap(evlist, true);
 785                                 if (!maps)
 786                                         return -1;
 787                                 evlist->overwrite_mmap = maps;
 788                                 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
 789                                         perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 790                         }
 791                         mp->prot &= ~PROT_WRITE;
 792                 }
 793
 794                 if (evsel->system_wide && thread)
 795                         continue;
 796
 797                 cpu = cpu_map__idx(evsel->cpus, evlist_cpu);
 798                 if (cpu == -1)
 799                         continue;
 800
 801                 fd = FD(evsel, cpu, thread);
 802
 803                 if (*output == -1) {
 804                         *output = fd;
 805
 806                         if (perf_mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
 807                                 return -1;
 808                 } else {
 809                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
 810                                 return -1;
 811
 812                         perf_mmap__get(&maps[idx]);
 813                 }
 814
 815                 revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
 816
 817                 /*
 818                  * The system_wide flag causes a selected event to be opened
 819                  * always without a pid.  Consequently it will never get a
 820                  * POLLHUP, but it is used for tracking in combination with
 821                  * other events, so it should not need to be polled anyway.
 822                  * Therefore don't add it for polling.
 823                  */
 824                 if (!evsel->system_wide &&
 825                     __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
 826                         perf_mmap__put(&maps[idx]);
 827                         return -1;
 828                 }
 829
 830                 if (evsel->attr.read_format & PERF_FORMAT_ID) {
 831                         if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
 832                                                    fd) < 0)
 833                                 return -1;
 834                         perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
 835                                                  thread);
 836                 }
 837         }
 838
 839         return 0;
 840 }
 841
 842 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
 843                                      struct mmap_params *mp)
 844 {
 845         int cpu, thread;
 846         int nr_cpus = cpu_map__nr(evlist->cpus);
 847         int nr_threads = thread_map__nr(evlist->threads);
 848
 849         pr_debug2("perf event ring buffer mmapped per cpu\n");
 850         for (cpu = 0; cpu < nr_cpus; cpu++) {
 851                 int output = -1;
 852                 int output_overwrite = -1;
 853
 854                 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
 855                                               true);
 856
 857                 for (thread = 0; thread < nr_threads; thread++) {
 858                         if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
 859                                                         thread, &output, &output_overwrite))
 860                                 goto out_unmap;
 861                 }
 862         }
 863
 864         return 0;
 865
 866 out_unmap:
 867         perf_evlist__munmap_nofree(evlist);
 868         return -1;
 869 }
 870
 871 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
 872                                         struct mmap_params *mp)
 873 {
 874         int thread;
 875         int nr_threads = thread_map__nr(evlist->threads);
 876
 877         pr_debug2("perf event ring buffer mmapped per thread\n");
 878         for (thread = 0; thread < nr_threads; thread++) {
 879                 int output = -1;
 880                 int output_overwrite = -1;
 881
 882                 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
 883                                               false);
 884
 885                 if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
 886                                                 &output, &output_overwrite))
 887                         goto out_unmap;
 888         }
 889
 890         return 0;
 891
 892 out_unmap:
 893         perf_evlist__munmap_nofree(evlist);
 894         return -1;
 895 }
 896
 897 unsigned long perf_event_mlock_kb_in_pages(void)
 898 {
 899         unsigned long pages;
 900         int max;
 901
 902         if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
 903                 /*
 904                  * Pick a once upon a time good value, i.e. things look
 905                  * strange since we can't read a sysctl value, but lets not
 906                  * die yet...
 907                  */
 908                 max = 512;
 909         } else {
 910                 max -= (page_size / 1024);
 911         }
 912
 913         pages = (max * 1024) / page_size;
 914         if (!is_power_of_2(pages))
 915                 pages = rounddown_pow_of_two(pages);
 916
 917         return pages;
 918 }
 919
 920 size_t perf_evlist__mmap_size(unsigned long pages)
 921 {
 922         if (pages == UINT_MAX)
 923                 pages = perf_event_mlock_kb_in_pages();
 924         else if (!is_power_of_2(pages))
 925                 return 0;
 926
 927         return (pages + 1) * page_size;
 928 }
 929
 930 static long parse_pages_arg(const char *str, unsigned long min,
 931                             unsigned long max)
 932 {
 933         unsigned long pages, val;
 934         static struct parse_tag tags[] = {
 935                 { .tag  = 'B', .mult = 1       },
 936                 { .tag  = 'K', .mult = 1 << 10 },
 937                 { .tag  = 'M', .mult = 1 << 20 },
 938                 { .tag  = 'G', .mult = 1 << 30 },
 939                 { .tag  = 0 },
 940         };
 941
 942         if (str == NULL)
 943                 return -EINVAL;
 944
 945         val = parse_tag_value(str, tags);
 946         if (val != (unsigned long) -1) {
 947                 /* we got file size value */
 948                 pages = PERF_ALIGN(val, page_size) / page_size;
 949         } else {
 950                 /* we got pages count value */
 951                 char *eptr;
 952                 pages = strtoul(str, &eptr, 10);
 953                 if (*eptr != '\0')
 954                         return -EINVAL;
 955         }
 956
 957         if (pages == 0 && min == 0) {
 958                 /* leave number of pages at 0 */
 959         } else if (!is_power_of_2(pages)) {
 960                 char buf[100];
 961
 962                 /* round pages up to next power of 2 */
 963                 pages = roundup_pow_of_two(pages);
 964                 if (!pages)
 965                         return -EINVAL;
 966
 967                 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
 968                 pr_info("rounding mmap pages size to %s (%lu pages)\n",
 969                         buf, pages);
 970         }
 971
 972         if (pages > max)
 973                 return -EINVAL;
 974
 975         return pages;
 976 }
 977
 978 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
 979 {
 980         unsigned long max = UINT_MAX;
 981         long pages;
 982
 983         if (max > SIZE_MAX / page_size)
 984                 max = SIZE_MAX / page_size;
 985
 986         pages = parse_pages_arg(str, 1, max);
 987         if (pages < 0) {
 988                 pr_err("Invalid argument for --mmap_pages/-m\n");
 989                 return -1;
 990         }
 991
 992         *mmap_pages = pages;
 993         return 0;
 994 }
 995
 996 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
 997                                   int unset __maybe_unused)
 998 {
 999         return __perf_evlist__parse_mmap_pages(opt->value, str);
1000 }
1001
1002 /**
1003  * perf_evlist__mmap_ex - Create mmaps to receive events.
1004  * @evlist: list of events
1005  * @pages: map length in pages
1006  * @overwrite: overwrite older events?
1007  * @auxtrace_pages - auxtrace map length in pages
1008  * @auxtrace_overwrite - overwrite older auxtrace data?
1009  *
1010  * If @overwrite is %false the user needs to signal event consumption using
1011  * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
1012  * automatically.
1013  *
1014  * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1015  * consumption using auxtrace_mmap__write_tail().
1016  *
1017  * Return: %0 on success, negative error code otherwise.
1018  */
1019 int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
1020                          unsigned int auxtrace_pages,
1021                          bool auxtrace_overwrite)
1022 {
1023         struct perf_evsel *evsel;
1024         const struct cpu_map *cpus = evlist->cpus;
1025         const struct thread_map *threads = evlist->threads;
1026         /*
1027          * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1028          * Its value is decided by evsel's write_backward.
1029          * So &mp should not be passed through const pointer.
1030          */
1031         struct mmap_params mp;
1032
1033         if (!evlist->mmap)
1034                 evlist->mmap = perf_evlist__alloc_mmap(evlist, false);
1035         if (!evlist->mmap)
1036                 return -ENOMEM;
1037
1038         if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
1039                 return -ENOMEM;
1040
1041         evlist->mmap_len = perf_evlist__mmap_size(pages);
1042         pr_debug("mmap size %zuB\n", evlist->mmap_len);
1043         mp.mask = evlist->mmap_len - page_size - 1;
1044
1045         auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
1046                                    auxtrace_pages, auxtrace_overwrite);
1047
1048         evlist__for_each_entry(evlist, evsel) {
1049                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
1050                     evsel->sample_id == NULL &&
1051                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
1052                         return -ENOMEM;
1053         }
1054
1055         if (cpu_map__empty(cpus))
1056                 return perf_evlist__mmap_per_thread(evlist, &mp);
1057
1058         return perf_evlist__mmap_per_cpu(evlist, &mp);
1059 }
1060
1061 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
1062 {
1063         return perf_evlist__mmap_ex(evlist, pages, 0, false);
1064 }
1065
1066 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
1067 {
1068         bool all_threads = (target->per_thread && target->system_wide);
1069         struct cpu_map *cpus;
1070         struct thread_map *threads;
1071
1072         /*
1073          * If specify '-a' and '--per-thread' to perf record, perf record
1074          * will override '--per-thread'. target->per_thread = false and
1075          * target->system_wide = true.
1076          *
1077          * If specify '--per-thread' only to perf record,
1078          * target->per_thread = true and target->system_wide = false.
1079          *
1080          * So target->per_thread && target->system_wide is false.
1081          * For perf record, thread_map__new_str doesn't call
1082          * thread_map__new_all_cpus. That will keep perf record's
1083          * current behavior.
1084          *
1085          * For perf stat, it allows the case that target->per_thread and
1086          * target->system_wide are all true. It means to collect system-wide
1087          * per-thread data. thread_map__new_str will call
1088          * thread_map__new_all_cpus to enumerate all threads.
1089          */
1090         threads = thread_map__new_str(target->pid, target->tid, target->uid,
1091                                       all_threads);
1092
1093         if (!threads)
1094                 return -1;
1095
1096         if (target__uses_dummy_map(target))
1097                 cpus = cpu_map__dummy_new();
1098         else
1099                 cpus = cpu_map__new(target->cpu_list);
1100
1101         if (!cpus)
1102                 goto out_delete_threads;
1103
1104         evlist->has_user_cpus = !!target->cpu_list;
1105
1106         perf_evlist__set_maps(evlist, cpus, threads);
1107
1108         return 0;
1109
1110 out_delete_threads:
1111         thread_map__put(threads);
1112         return -1;
1113 }
1114
1115 void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
1116                            struct thread_map *threads)
1117 {
1118         /*
1119          * Allow for the possibility that one or another of the maps isn't being
1120          * changed i.e. don't put it.  Note we are assuming the maps that are
1121          * being applied are brand new and evlist is taking ownership of the
1122          * original reference count of 1.  If that is not the case it is up to
1123          * the caller to increase the reference count.
1124          */
1125         if (cpus != evlist->cpus) {
1126                 cpu_map__put(evlist->cpus);
1127                 evlist->cpus = cpu_map__get(cpus);
1128         }
1129
1130         if (threads != evlist->threads) {
1131                 thread_map__put(evlist->threads);
1132                 evlist->threads = thread_map__get(threads);
1133         }
1134
1135         perf_evlist__propagate_maps(evlist);
1136 }
1137
1138 void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
1139                                    enum perf_event_sample_format bit)
1140 {
1141         struct perf_evsel *evsel;
1142
1143         evlist__for_each_entry(evlist, evsel)
1144                 __perf_evsel__set_sample_bit(evsel, bit);
1145 }
1146
1147 void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
1148                                      enum perf_event_sample_format bit)
1149 {
1150         struct perf_evsel *evsel;
1151
1152         evlist__for_each_entry(evlist, evsel)
1153                 __perf_evsel__reset_sample_bit(evsel, bit);
1154 }
1155
1156 int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
1157 {
1158         struct perf_evsel *evsel;
1159         int err = 0;
1160
1161         evlist__for_each_entry(evlist, evsel) {
1162                 if (evsel->filter == NULL)
1163                         continue;
1164
1165                 /*
1166                  * filters only work for tracepoint event, which doesn't have cpu limit.
1167                  * So evlist and evsel should always be same.
1168                  */
1169                 err = perf_evsel__apply_filter(evsel, evsel->filter);
1170                 if (err) {
1171                         *err_evsel = evsel;
1172                         break;
1173                 }
1174         }
1175
1176         return err;
1177 }
1178
1179 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
1180 {
1181         struct perf_evsel *evsel;
1182         int err = 0;
1183
1184         evlist__for_each_entry(evlist, evsel) {
1185                 if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
1186                         continue;
1187
1188                 err = perf_evsel__set_filter(evsel, filter);
1189                 if (err)
1190                         break;
1191         }
1192
1193         return err;
1194 }
1195
1196 int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids)
1197 {
1198         char *filter;
1199         int ret = -1;
1200         size_t i;
1201
1202         for (i = 0; i < npids; ++i) {
1203                 if (i == 0) {
1204                         if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1205                                 return -1;
1206                 } else {
1207                         char *tmp;
1208
1209                         if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1210                                 goto out_free;
1211
1212                         free(filter);
1213                         filter = tmp;
1214                 }
1215         }
1216
1217         ret = perf_evlist__set_filter(evlist, filter);
1218 out_free:
1219         free(filter);
1220         return ret;
1221 }
1222
1223 int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid)
1224 {
1225         return perf_evlist__set_filter_pids(evlist, 1, &pid);
1226 }
1227
1228 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
1229 {
1230         struct perf_evsel *pos;
1231
1232         if (evlist->nr_entries == 1)
1233                 return true;
1234
1235         if (evlist->id_pos < 0 || evlist->is_pos < 0)
1236                 return false;
1237
1238         evlist__for_each_entry(evlist, pos) {
1239                 if (pos->id_pos != evlist->id_pos ||
1240                     pos->is_pos != evlist->is_pos)
1241                         return false;
1242         }
1243
1244         return true;
1245 }
1246
1247 u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1248 {
1249         struct perf_evsel *evsel;
1250
1251         if (evlist->combined_sample_type)
1252                 return evlist->combined_sample_type;
1253
1254         evlist__for_each_entry(evlist, evsel)
1255                 evlist->combined_sample_type |= evsel->attr.sample_type;
1256
1257         return evlist->combined_sample_type;
1258 }
1259
1260 u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1261 {
1262         evlist->combined_sample_type = 0;
1263         return __perf_evlist__combined_sample_type(evlist);
1264 }
1265
1266 u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist)
1267 {
1268         struct perf_evsel *evsel;
1269         u64 branch_type = 0;
1270
1271         evlist__for_each_entry(evlist, evsel)
1272                 branch_type |= evsel->attr.branch_sample_type;
1273         return branch_type;
1274 }
1275
1276 bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
1277 {
1278         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1279         u64 read_format = first->attr.read_format;
1280         u64 sample_type = first->attr.sample_type;
1281
1282         evlist__for_each_entry(evlist, pos) {
1283                 if (read_format != pos->attr.read_format)
1284                         return false;
1285         }
1286
1287         /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1288         if ((sample_type & PERF_SAMPLE_READ) &&
1289             !(read_format & PERF_FORMAT_ID)) {
1290                 return false;
1291         }
1292
1293         return true;
1294 }
1295
1296 u64 perf_evlist__read_format(struct perf_evlist *evlist)
1297 {
1298         struct perf_evsel *first = perf_evlist__first(evlist);
1299         return first->attr.read_format;
1300 }
1301
1302 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
1303 {
1304         struct perf_evsel *first = perf_evlist__first(evlist);
1305         struct perf_sample *data;
1306         u64 sample_type;
1307         u16 size = 0;
1308
1309         if (!first->attr.sample_id_all)
1310                 goto out;
1311
1312         sample_type = first->attr.sample_type;
1313
1314         if (sample_type & PERF_SAMPLE_TID)
1315                 size += sizeof(data->tid) * 2;
1316
1317        if (sample_type & PERF_SAMPLE_TIME)
1318                 size += sizeof(data->time);
1319
1320         if (sample_type & PERF_SAMPLE_ID)
1321                 size += sizeof(data->id);
1322
1323         if (sample_type & PERF_SAMPLE_STREAM_ID)
1324                 size += sizeof(data->stream_id);
1325
1326         if (sample_type & PERF_SAMPLE_CPU)
1327                 size += sizeof(data->cpu) * 2;
1328
1329         if (sample_type & PERF_SAMPLE_IDENTIFIER)
1330                 size += sizeof(data->id);
1331 out:
1332         return size;
1333 }
1334
1335 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
1336 {
1337         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1338
1339         evlist__for_each_entry_continue(evlist, pos) {
1340                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
1341                         return false;
1342         }
1343
1344         return true;
1345 }
1346
1347 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
1348 {
1349         struct perf_evsel *first = perf_evlist__first(evlist);
1350         return first->attr.sample_id_all;
1351 }
1352
1353 void perf_evlist__set_selected(struct perf_evlist *evlist,
1354                                struct perf_evsel *evsel)
1355 {
1356         evlist->selected = evsel;
1357 }
1358
1359 void perf_evlist__close(struct perf_evlist *evlist)
1360 {
1361         struct perf_evsel *evsel;
1362
1363         evlist__for_each_entry_reverse(evlist, evsel)
1364                 perf_evsel__close(evsel);
1365 }
1366
1367 static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
1368 {
1369         struct cpu_map    *cpus;
1370         struct thread_map *threads;
1371         int err = -ENOMEM;
1372
1373         /*
1374          * Try reading /sys/devices/system/cpu/online to get
1375          * an all cpus map.
1376          *
1377          * FIXME: -ENOMEM is the best we can do here, the cpu_map
1378          * code needs an overhaul to properly forward the
1379          * error, and we may not want to do that fallback to a
1380          * default cpu identity map :-\
1381          */
1382         cpus = cpu_map__new(NULL);
1383         if (!cpus)
1384                 goto out;
1385
1386         threads = thread_map__new_dummy();
1387         if (!threads)
1388                 goto out_put;
1389
1390         perf_evlist__set_maps(evlist, cpus, threads);
1391 out:
1392         return err;
1393 out_put:
1394         cpu_map__put(cpus);
1395         goto out;
1396 }
1397
1398 int perf_evlist__open(struct perf_evlist *evlist)
1399 {
1400         struct perf_evsel *evsel;
1401         int err;
1402
1403         /*
1404          * Default: one fd per CPU, all threads, aka systemwide
1405          * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1406          */
1407         if (evlist->threads == NULL && evlist->cpus == NULL) {
1408                 err = perf_evlist__create_syswide_maps(evlist);
1409                 if (err < 0)
1410                         goto out_err;
1411         }
1412
1413         perf_evlist__update_id_pos(evlist);
1414
1415         evlist__for_each_entry(evlist, evsel) {
1416                 err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
1417                 if (err < 0)
1418                         goto out_err;
1419         }
1420
1421         return 0;
1422 out_err:
1423         perf_evlist__close(evlist);
1424         errno = -err;
1425         return err;
1426 }
1427
1428 int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1429                                   const char *argv[], bool pipe_output,
1430                                   void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1431 {
1432         int child_ready_pipe[2], go_pipe[2];
1433         char bf;
1434
1435         if (pipe(child_ready_pipe) < 0) {
1436                 perror("failed to create 'ready' pipe");
1437                 return -1;
1438         }
1439
1440         if (pipe(go_pipe) < 0) {
1441                 perror("failed to create 'go' pipe");
1442                 goto out_close_ready_pipe;
1443         }
1444
1445         evlist->workload.pid = fork();
1446         if (evlist->workload.pid < 0) {
1447                 perror("failed to fork");
1448                 goto out_close_pipes;
1449         }
1450
1451         if (!evlist->workload.pid) {
1452                 int ret;
1453
1454                 if (pipe_output)
1455                         dup2(2, 1);
1456
1457                 signal(SIGTERM, SIG_DFL);
1458
1459                 close(child_ready_pipe[0]);
1460                 close(go_pipe[1]);
1461                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1462
1463                 /*
1464                  * Tell the parent we're ready to go
1465                  */
1466                 close(child_ready_pipe[1]);
1467
1468                 /*
1469                  * Wait until the parent tells us to go.
1470                  */
1471                 ret = read(go_pipe[0], &bf, 1);
1472                 /*
1473                  * The parent will ask for the execvp() to be performed by
1474                  * writing exactly one byte, in workload.cork_fd, usually via
1475                  * perf_evlist__start_workload().
1476                  *
1477                  * For cancelling the workload without actually running it,
1478                  * the parent will just close workload.cork_fd, without writing
1479                  * anything, i.e. read will return zero and we just exit()
1480                  * here.
1481                  */
1482                 if (ret != 1) {
1483                         if (ret == -1)
1484                                 perror("unable to read pipe");
1485                         exit(ret);
1486                 }
1487
1488                 execvp(argv[0], (char **)argv);
1489
1490                 if (exec_error) {
1491                         union sigval val;
1492
1493                         val.sival_int = errno;
1494                         if (sigqueue(getppid(), SIGUSR1, val))
1495                                 perror(argv[0]);
1496                 } else
1497                         perror(argv[0]);
1498                 exit(-1);
1499         }
1500
1501         if (exec_error) {
1502                 struct sigaction act = {
1503                         .sa_flags     = SA_SIGINFO,
1504                         .sa_sigaction = exec_error,
1505                 };
1506                 sigaction(SIGUSR1, &act, NULL);
1507         }
1508
1509         if (target__none(target)) {
1510                 if (evlist->threads == NULL) {
1511                         fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1512                                 __func__, __LINE__);
1513                         goto out_close_pipes;
1514                 }
1515                 thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
1516         }
1517
1518         close(child_ready_pipe[1]);
1519         close(go_pipe[0]);
1520         /*
1521          * wait for child to settle
1522          */
1523         if (read(child_ready_pipe[0], &bf, 1) == -1) {
1524                 perror("unable to read pipe");
1525                 goto out_close_pipes;
1526         }
1527
1528         fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1529         evlist->workload.cork_fd = go_pipe[1];
1530         close(child_ready_pipe[0]);
1531         return 0;
1532
1533 out_close_pipes:
1534         close(go_pipe[0]);
1535         close(go_pipe[1]);
1536 out_close_ready_pipe:
1537         close(child_ready_pipe[0]);
1538         close(child_ready_pipe[1]);
1539         return -1;
1540 }
1541
1542 int perf_evlist__start_workload(struct perf_evlist *evlist)
1543 {
1544         if (evlist->workload.cork_fd > 0) {
1545                 char bf = 0;
1546                 int ret;
1547                 /*
1548                  * Remove the cork, let it rip!
1549                  */
1550                 ret = write(evlist->workload.cork_fd, &bf, 1);
1551                 if (ret < 0)
1552                         perror("unable to write to pipe");
1553
1554                 close(evlist->workload.cork_fd);
1555                 return ret;
1556         }
1557
1558         return 0;
1559 }
1560
1561 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1562                               struct perf_sample *sample)
1563 {
1564         struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1565
1566         if (!evsel)
1567                 return -EFAULT;
1568         return perf_evsel__parse_sample(evsel, event, sample);
1569 }
1570
1571 int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
1572                                         union perf_event *event,
1573                                         u64 *timestamp)
1574 {
1575         struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1576
1577         if (!evsel)
1578                 return -EFAULT;
1579         return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1580 }
1581
1582 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1583 {
1584         struct perf_evsel *evsel;
1585         size_t printed = 0;
1586
1587         evlist__for_each_entry(evlist, evsel) {
1588                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1589                                    perf_evsel__name(evsel));
1590         }
1591
1592         return printed + fprintf(fp, "\n");
1593 }
1594
1595 int perf_evlist__strerror_open(struct perf_evlist *evlist,
1596                                int err, char *buf, size_t size)
1597 {
1598         int printed, value;
1599         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1600
1601         switch (err) {
1602         case EACCES:
1603         case EPERM:
1604                 printed = scnprintf(buf, size,
1605                                     "Error:\t%s.\n"
1606                                     "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1607
1608                 value = perf_event_paranoid();
1609
1610                 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1611
1612                 if (value >= 2) {
1613                         printed += scnprintf(buf + printed, size - printed,
1614                                              "For your workloads it needs to be <= 1\nHint:\t");
1615                 }
1616                 printed += scnprintf(buf + printed, size - printed,
1617                                      "For system wide tracing it needs to be set to -1.\n");
1618
1619                 printed += scnprintf(buf + printed, size - printed,
1620                                     "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1621                                     "Hint:\tThe current value is %d.", value);
1622                 break;
1623         case EINVAL: {
1624                 struct perf_evsel *first = perf_evlist__first(evlist);
1625                 int max_freq;
1626
1627                 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1628                         goto out_default;
1629
1630                 if (first->attr.sample_freq < (u64)max_freq)
1631                         goto out_default;
1632
1633                 printed = scnprintf(buf, size,
1634                                     "Error:\t%s.\n"
1635                                     "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1636                                     "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1637                                     emsg, max_freq, first->attr.sample_freq);
1638                 break;
1639         }
1640         default:
1641 out_default:
1642                 scnprintf(buf, size, "%s", emsg);
1643                 break;
1644         }
1645
1646         return 0;
1647 }
1648
1649 int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
1650 {
1651         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1652         int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
1653
1654         switch (err) {
1655         case EPERM:
1656                 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1657                 printed += scnprintf(buf + printed, size - printed,
1658                                      "Error:\t%s.\n"
1659                                      "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1660                                      "Hint:\tTried using %zd kB.\n",
1661                                      emsg, pages_max_per_user, pages_attempted);
1662
1663                 if (pages_attempted >= pages_max_per_user) {
1664                         printed += scnprintf(buf + printed, size - printed,
1665                                              "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1666                                              pages_max_per_user + pages_attempted);
1667                 }
1668
1669                 printed += scnprintf(buf + printed, size - printed,
1670                                      "Hint:\tTry using a smaller -m/--mmap-pages value.");
1671                 break;
1672         default:
1673                 scnprintf(buf, size, "%s", emsg);
1674                 break;
1675         }
1676
1677         return 0;
1678 }
1679
1680 void perf_evlist__to_front(struct perf_evlist *evlist,
1681                            struct perf_evsel *move_evsel)
1682 {
1683         struct perf_evsel *evsel, *n;
1684         LIST_HEAD(move);
1685
1686         if (move_evsel == perf_evlist__first(evlist))
1687                 return;
1688
1689         evlist__for_each_entry_safe(evlist, n, evsel) {
1690                 if (evsel->leader == move_evsel->leader)
1691                         list_move_tail(&evsel->node, &move);
1692         }
1693
1694         list_splice(&move, &evlist->entries);
1695 }
1696
1697 void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
1698                                      struct perf_evsel *tracking_evsel)
1699 {
1700         struct perf_evsel *evsel;
1701
1702         if (tracking_evsel->tracking)
1703                 return;
1704
1705         evlist__for_each_entry(evlist, evsel) {
1706                 if (evsel != tracking_evsel)
1707                         evsel->tracking = false;
1708         }
1709
1710         tracking_evsel->tracking = true;
1711 }
1712
1713 struct perf_evsel *
1714 perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
1715                                const char *str)
1716 {
1717         struct perf_evsel *evsel;
1718
1719         evlist__for_each_entry(evlist, evsel) {
1720                 if (!evsel->name)
1721                         continue;
1722                 if (strcmp(str, evsel->name) == 0)
1723                         return evsel;
1724         }
1725
1726         return NULL;
1727 }
1728
1729 void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist,
1730                                   enum bkw_mmap_state state)
1731 {
1732         enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1733         enum action {
1734                 NONE,
1735                 PAUSE,
1736                 RESUME,
1737         } action = NONE;
1738
1739         if (!evlist->overwrite_mmap)
1740                 return;
1741
1742         switch (old_state) {
1743         case BKW_MMAP_NOTREADY: {
1744                 if (state != BKW_MMAP_RUNNING)
1745                         goto state_err;
1746                 break;
1747         }
1748         case BKW_MMAP_RUNNING: {
1749                 if (state != BKW_MMAP_DATA_PENDING)
1750                         goto state_err;
1751                 action = PAUSE;
1752                 break;
1753         }
1754         case BKW_MMAP_DATA_PENDING: {
1755                 if (state != BKW_MMAP_EMPTY)
1756                         goto state_err;
1757                 break;
1758         }
1759         case BKW_MMAP_EMPTY: {
1760                 if (state != BKW_MMAP_RUNNING)
1761                         goto state_err;
1762                 action = RESUME;
1763                 break;
1764         }
1765         default:
1766                 WARN_ONCE(1, "Shouldn't get there\n");
1767         }
1768
1769         evlist->bkw_mmap_state = state;
1770
1771         switch (action) {
1772         case PAUSE:
1773                 perf_evlist__pause(evlist);
1774                 break;
1775         case RESUME:
1776                 perf_evlist__resume(evlist);
1777                 break;
1778         case NONE:
1779         default:
1780                 break;
1781         }
1782
1783 state_err:
1784         return;
1785 }
1786
1787 bool perf_evlist__exclude_kernel(struct perf_evlist *evlist)
1788 {
1789         struct perf_evsel *evsel;
1790
1791         evlist__for_each_entry(evlist, evsel) {
1792                 if (!evsel->attr.exclude_kernel)
1793                         return false;
1794         }
1795
1796         return true;
1797 }
1798
1799 /*
1800  * Events in data file are not collect in groups, but we still want
1801  * the group display. Set the artificial group and set the leader's
1802  * forced_leader flag to notify the display code.
1803  */
1804 void perf_evlist__force_leader(struct perf_evlist *evlist)
1805 {
1806         if (!evlist->nr_groups) {
1807                 struct perf_evsel *leader = perf_evlist__first(evlist);
1808
1809                 perf_evlist__set_leader(evlist);
1810                 leader->forced_leader = true;
1811         }
1812 }
1813
1814 struct perf_evsel *perf_evlist__reset_weak_group(struct perf_evlist *evsel_list,
1815                                                  struct perf_evsel *evsel)
1816 {
1817         struct perf_evsel *c2, *leader;
1818         bool is_open = true;
1819
1820         leader = evsel->leader;
1821         pr_debug("Weak group for %s/%d failed\n",
1822                         leader->name, leader->nr_members);
1823
1824         /*
1825          * for_each_group_member doesn't work here because it doesn't
1826          * include the first entry.
1827          */
1828         evlist__for_each_entry(evsel_list, c2) {
1829                 if (c2 == evsel)
1830                         is_open = false;
1831                 if (c2->leader == leader) {
1832                         if (is_open)
1833                                 perf_evsel__close(c2);
1834                         c2->leader = c2;
1835                         c2->nr_members = 0;
1836                 }
1837         }
1838         return leader;
1839 }