tools/perf/util/evlist.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   4  *
   5  * Parts came from builtin-{top,stat,record}.c, see those files for further
   6  * copyright notes.
   7  */
   8 #include <api/fs/fs.h>
   9 #include <errno.h>
  10 #include <inttypes.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 "debug.h"
  18 #include "units.h"
  19 #include "asm/bug.h"
  20 #include "bpf-event.h"
  21 #include <signal.h>
  22 #include <unistd.h>
  23
  24 #include "parse-events.h"
  25 #include <subcmd/parse-options.h>
  26
  27 #include <fcntl.h>
  28 #include <sys/ioctl.h>
  29 #include <sys/mman.h>
  30
  31 #include <linux/bitops.h>
  32 #include <linux/hash.h>
  33 #include <linux/log2.h>
  34 #include <linux/err.h>
  35 #include <linux/zalloc.h>
  36 #include <perf/evlist.h>
  37 #include <perf/cpumap.h>
  38
  39 #ifdef LACKS_SIGQUEUE_PROTOTYPE
  40 int sigqueue(pid_t pid, int sig, const union sigval value);
  41 #endif
  42
  43 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  44 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
  45
  46 void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
  47                   struct perf_thread_map *threads)
  48 {
  49         int i;
  50
  51         for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  52                 INIT_HLIST_HEAD(&evlist->heads[i]);
  53         perf_evlist__init(&evlist->core);
  54         perf_evlist__set_maps(evlist, cpus, threads);
  55         fdarray__init(&evlist->pollfd, 64);
  56         evlist->workload.pid = -1;
  57         evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
  58 }
  59
  60 struct evlist *evlist__new(void)
  61 {
  62         struct evlist *evlist = zalloc(sizeof(*evlist));
  63
  64         if (evlist != NULL)
  65                 evlist__init(evlist, NULL, NULL);
  66
  67         return evlist;
  68 }
  69
  70 struct evlist *perf_evlist__new_default(void)
  71 {
  72         struct evlist *evlist = evlist__new();
  73
  74         if (evlist && perf_evlist__add_default(evlist)) {
  75                 evlist__delete(evlist);
  76                 evlist = NULL;
  77         }
  78
  79         return evlist;
  80 }
  81
  82 struct evlist *perf_evlist__new_dummy(void)
  83 {
  84         struct evlist *evlist = evlist__new();
  85
  86         if (evlist && perf_evlist__add_dummy(evlist)) {
  87                 evlist__delete(evlist);
  88                 evlist = NULL;
  89         }
  90
  91         return evlist;
  92 }
  93
  94 /**
  95  * perf_evlist__set_id_pos - set the positions of event ids.
  96  * @evlist: selected event list
  97  *
  98  * Events with compatible sample types all have the same id_pos
  99  * and is_pos.  For convenience, put a copy on evlist.
 100  */
 101 void perf_evlist__set_id_pos(struct evlist *evlist)
 102 {
 103         struct evsel *first = perf_evlist__first(evlist);
 104
 105         evlist->id_pos = first->id_pos;
 106         evlist->is_pos = first->is_pos;
 107 }
 108
 109 static void perf_evlist__update_id_pos(struct evlist *evlist)
 110 {
 111         struct evsel *evsel;
 112
 113         evlist__for_each_entry(evlist, evsel)
 114                 perf_evsel__calc_id_pos(evsel);
 115
 116         perf_evlist__set_id_pos(evlist);
 117 }
 118
 119 static void perf_evlist__purge(struct evlist *evlist)
 120 {
 121         struct evsel *pos, *n;
 122
 123         evlist__for_each_entry_safe(evlist, n, pos) {
 124                 list_del_init(&pos->core.node);
 125                 pos->evlist = NULL;
 126                 evsel__delete(pos);
 127         }
 128
 129         evlist->core.nr_entries = 0;
 130 }
 131
 132 void perf_evlist__exit(struct evlist *evlist)
 133 {
 134         zfree(&evlist->mmap);
 135         zfree(&evlist->overwrite_mmap);
 136         fdarray__exit(&evlist->pollfd);
 137 }
 138
 139 void evlist__delete(struct evlist *evlist)
 140 {
 141         if (evlist == NULL)
 142                 return;
 143
 144         perf_evlist__munmap(evlist);
 145         evlist__close(evlist);
 146         perf_cpu_map__put(evlist->cpus);
 147         perf_thread_map__put(evlist->threads);
 148         evlist->cpus = NULL;
 149         evlist->threads = NULL;
 150         perf_evlist__purge(evlist);
 151         perf_evlist__exit(evlist);
 152         free(evlist);
 153 }
 154
 155 static void __perf_evlist__propagate_maps(struct evlist *evlist,
 156                                           struct evsel *evsel)
 157 {
 158         /*
 159          * We already have cpus for evsel (via PMU sysfs) so
 160          * keep it, if there's no target cpu list defined.
 161          */
 162         if (!evsel->core.own_cpus || evlist->core.has_user_cpus) {
 163                 perf_cpu_map__put(evsel->core.cpus);
 164                 evsel->core.cpus = perf_cpu_map__get(evlist->cpus);
 165         } else if (evsel->core.cpus != evsel->core.own_cpus) {
 166                 perf_cpu_map__put(evsel->core.cpus);
 167                 evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
 168         }
 169
 170         perf_thread_map__put(evsel->core.threads);
 171         evsel->core.threads = perf_thread_map__get(evlist->threads);
 172 }
 173
 174 static void perf_evlist__propagate_maps(struct evlist *evlist)
 175 {
 176         struct evsel *evsel;
 177
 178         evlist__for_each_entry(evlist, evsel)
 179                 __perf_evlist__propagate_maps(evlist, evsel);
 180 }
 181
 182 void evlist__add(struct evlist *evlist, struct evsel *entry)
 183 {
 184         entry->evlist = evlist;
 185         entry->idx = evlist->core.nr_entries;
 186         entry->tracking = !entry->idx;
 187
 188         perf_evlist__add(&evlist->core, &entry->core);
 189
 190         if (evlist->core.nr_entries == 1)
 191                 perf_evlist__set_id_pos(evlist);
 192
 193         __perf_evlist__propagate_maps(evlist, entry);
 194 }
 195
 196 void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 197 {
 198         evsel->evlist = NULL;
 199         perf_evlist__remove(&evlist->core, &evsel->core);
 200 }
 201
 202 void perf_evlist__splice_list_tail(struct evlist *evlist,
 203                                    struct list_head *list)
 204 {
 205         struct evsel *evsel, *temp;
 206
 207         __evlist__for_each_entry_safe(list, temp, evsel) {
 208                 list_del_init(&evsel->core.node);
 209                 evlist__add(evlist, evsel);
 210         }
 211 }
 212
 213 void __perf_evlist__set_leader(struct list_head *list)
 214 {
 215         struct evsel *evsel, *leader;
 216
 217         leader = list_entry(list->next, struct evsel, core.node);
 218         evsel = list_entry(list->prev, struct evsel, core.node);
 219
 220         leader->nr_members = evsel->idx - leader->idx + 1;
 221
 222         __evlist__for_each_entry(list, evsel) {
 223                 evsel->leader = leader;
 224         }
 225 }
 226
 227 void perf_evlist__set_leader(struct evlist *evlist)
 228 {
 229         if (evlist->core.nr_entries) {
 230                 evlist->nr_groups = evlist->core.nr_entries > 1 ? 1 : 0;
 231                 __perf_evlist__set_leader(&evlist->core.entries);
 232         }
 233 }
 234
 235 int __perf_evlist__add_default(struct evlist *evlist, bool precise)
 236 {
 237         struct evsel *evsel = perf_evsel__new_cycles(precise);
 238
 239         if (evsel == NULL)
 240                 return -ENOMEM;
 241
 242         evlist__add(evlist, evsel);
 243         return 0;
 244 }
 245
 246 int perf_evlist__add_dummy(struct evlist *evlist)
 247 {
 248         struct perf_event_attr attr = {
 249                 .type   = PERF_TYPE_SOFTWARE,
 250                 .config = PERF_COUNT_SW_DUMMY,
 251                 .size   = sizeof(attr), /* to capture ABI version */
 252         };
 253         struct evsel *evsel = perf_evsel__new_idx(&attr, evlist->core.nr_entries);
 254
 255         if (evsel == NULL)
 256                 return -ENOMEM;
 257
 258         evlist__add(evlist, evsel);
 259         return 0;
 260 }
 261
 262 static int evlist__add_attrs(struct evlist *evlist,
 263                                   struct perf_event_attr *attrs, size_t nr_attrs)
 264 {
 265         struct evsel *evsel, *n;
 266         LIST_HEAD(head);
 267         size_t i;
 268
 269         for (i = 0; i < nr_attrs; i++) {
 270                 evsel = perf_evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
 271                 if (evsel == NULL)
 272                         goto out_delete_partial_list;
 273                 list_add_tail(&evsel->core.node, &head);
 274         }
 275
 276         perf_evlist__splice_list_tail(evlist, &head);
 277
 278         return 0;
 279
 280 out_delete_partial_list:
 281         __evlist__for_each_entry_safe(&head, n, evsel)
 282                 evsel__delete(evsel);
 283         return -1;
 284 }
 285
 286 int __perf_evlist__add_default_attrs(struct evlist *evlist,
 287                                      struct perf_event_attr *attrs, size_t nr_attrs)
 288 {
 289         size_t i;
 290
 291         for (i = 0; i < nr_attrs; i++)
 292                 event_attr_init(attrs + i);
 293
 294         return evlist__add_attrs(evlist, attrs, nr_attrs);
 295 }
 296
 297 struct evsel *
 298 perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
 299 {
 300         struct evsel *evsel;
 301
 302         evlist__for_each_entry(evlist, evsel) {
 303                 if (evsel->core.attr.type   == PERF_TYPE_TRACEPOINT &&
 304                     (int)evsel->core.attr.config == id)
 305                         return evsel;
 306         }
 307
 308         return NULL;
 309 }
 310
 311 struct evsel *
 312 perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
 313                                      const char *name)
 314 {
 315         struct evsel *evsel;
 316
 317         evlist__for_each_entry(evlist, evsel) {
 318                 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
 319                     (strcmp(evsel->name, name) == 0))
 320                         return evsel;
 321         }
 322
 323         return NULL;
 324 }
 325
 326 int perf_evlist__add_newtp(struct evlist *evlist,
 327                            const char *sys, const char *name, void *handler)
 328 {
 329         struct evsel *evsel = perf_evsel__newtp(sys, name);
 330
 331         if (IS_ERR(evsel))
 332                 return -1;
 333
 334         evsel->handler = handler;
 335         evlist__add(evlist, evsel);
 336         return 0;
 337 }
 338
 339 static int perf_evlist__nr_threads(struct evlist *evlist,
 340                                    struct evsel *evsel)
 341 {
 342         if (evsel->system_wide)
 343                 return 1;
 344         else
 345                 return thread_map__nr(evlist->threads);
 346 }
 347
 348 void evlist__disable(struct evlist *evlist)
 349 {
 350         struct evsel *pos;
 351
 352         evlist__for_each_entry(evlist, pos) {
 353                 if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->fd)
 354                         continue;
 355                 evsel__disable(pos);
 356         }
 357
 358         evlist->enabled = false;
 359 }
 360
 361 void evlist__enable(struct evlist *evlist)
 362 {
 363         struct evsel *pos;
 364
 365         evlist__for_each_entry(evlist, pos) {
 366                 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
 367                         continue;
 368                 evsel__enable(pos);
 369         }
 370
 371         evlist->enabled = true;
 372 }
 373
 374 void perf_evlist__toggle_enable(struct evlist *evlist)
 375 {
 376         (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
 377 }
 378
 379 static int perf_evlist__enable_event_cpu(struct evlist *evlist,
 380                                          struct evsel *evsel, int cpu)
 381 {
 382         int thread;
 383         int nr_threads = perf_evlist__nr_threads(evlist, evsel);
 384
 385         if (!evsel->fd)
 386                 return -EINVAL;
 387
 388         for (thread = 0; thread < nr_threads; thread++) {
 389                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 390                 if (err)
 391                         return err;
 392         }
 393         return 0;
 394 }
 395
 396 static int perf_evlist__enable_event_thread(struct evlist *evlist,
 397                                             struct evsel *evsel,
 398                                             int thread)
 399 {
 400         int cpu;
 401         int nr_cpus = cpu_map__nr(evlist->cpus);
 402
 403         if (!evsel->fd)
 404                 return -EINVAL;
 405
 406         for (cpu = 0; cpu < nr_cpus; cpu++) {
 407                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 408                 if (err)
 409                         return err;
 410         }
 411         return 0;
 412 }
 413
 414 int perf_evlist__enable_event_idx(struct evlist *evlist,
 415                                   struct evsel *evsel, int idx)
 416 {
 417         bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
 418
 419         if (per_cpu_mmaps)
 420                 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
 421         else
 422                 return perf_evlist__enable_event_thread(evlist, evsel, idx);
 423 }
 424
 425 int perf_evlist__alloc_pollfd(struct evlist *evlist)
 426 {
 427         int nr_cpus = cpu_map__nr(evlist->cpus);
 428         int nr_threads = thread_map__nr(evlist->threads);
 429         int nfds = 0;
 430         struct evsel *evsel;
 431
 432         evlist__for_each_entry(evlist, evsel) {
 433                 if (evsel->system_wide)
 434                         nfds += nr_cpus;
 435                 else
 436                         nfds += nr_cpus * nr_threads;
 437         }
 438
 439         if (fdarray__available_entries(&evlist->pollfd) < nfds &&
 440             fdarray__grow(&evlist->pollfd, nfds) < 0)
 441                 return -ENOMEM;
 442
 443         return 0;
 444 }
 445
 446 static int __perf_evlist__add_pollfd(struct evlist *evlist, int fd,
 447                                      struct perf_mmap *map, short revent)
 448 {
 449         int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
 450         /*
 451          * Save the idx so that when we filter out fds POLLHUP'ed we can
 452          * close the associated evlist->mmap[] entry.
 453          */
 454         if (pos >= 0) {
 455                 evlist->pollfd.priv[pos].ptr = map;
 456
 457                 fcntl(fd, F_SETFL, O_NONBLOCK);
 458         }
 459
 460         return pos;
 461 }
 462
 463 int perf_evlist__add_pollfd(struct evlist *evlist, int fd)
 464 {
 465         return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
 466 }
 467
 468 static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
 469                                          void *arg __maybe_unused)
 470 {
 471         struct perf_mmap *map = fda->priv[fd].ptr;
 472
 473         if (map)
 474                 perf_mmap__put(map);
 475 }
 476
 477 int perf_evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
 478 {
 479         return fdarray__filter(&evlist->pollfd, revents_and_mask,
 480                                perf_evlist__munmap_filtered, NULL);
 481 }
 482
 483 int perf_evlist__poll(struct evlist *evlist, int timeout)
 484 {
 485         return fdarray__poll(&evlist->pollfd, timeout);
 486 }
 487
 488 static void perf_evlist__id_hash(struct evlist *evlist,
 489                                  struct evsel *evsel,
 490                                  int cpu, int thread, u64 id)
 491 {
 492         int hash;
 493         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 494
 495         sid->id = id;
 496         sid->evsel = evsel;
 497         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 498         hlist_add_head(&sid->node, &evlist->heads[hash]);
 499 }
 500
 501 void perf_evlist__id_add(struct evlist *evlist, struct evsel *evsel,
 502                          int cpu, int thread, u64 id)
 503 {
 504         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 505         evsel->id[evsel->ids++] = id;
 506 }
 507
 508 int perf_evlist__id_add_fd(struct evlist *evlist,
 509                            struct evsel *evsel,
 510                            int cpu, int thread, int fd)
 511 {
 512         u64 read_data[4] = { 0, };
 513         int id_idx = 1; /* The first entry is the counter value */
 514         u64 id;
 515         int ret;
 516
 517         ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
 518         if (!ret)
 519                 goto add;
 520
 521         if (errno != ENOTTY)
 522                 return -1;
 523
 524         /* Legacy way to get event id.. All hail to old kernels! */
 525
 526         /*
 527          * This way does not work with group format read, so bail
 528          * out in that case.
 529          */
 530         if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
 531                 return -1;
 532
 533         if (!(evsel->core.attr.read_format & PERF_FORMAT_ID) ||
 534             read(fd, &read_data, sizeof(read_data)) == -1)
 535                 return -1;
 536
 537         if (evsel->core.attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 538                 ++id_idx;
 539         if (evsel->core.attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 540                 ++id_idx;
 541
 542         id = read_data[id_idx];
 543
 544  add:
 545         perf_evlist__id_add(evlist, evsel, cpu, thread, id);
 546         return 0;
 547 }
 548
 549 static void perf_evlist__set_sid_idx(struct evlist *evlist,
 550                                      struct evsel *evsel, int idx, int cpu,
 551                                      int thread)
 552 {
 553         struct perf_sample_id *sid = SID(evsel, cpu, thread);
 554         sid->idx = idx;
 555         if (evlist->cpus && cpu >= 0)
 556                 sid->cpu = evlist->cpus->map[cpu];
 557         else
 558                 sid->cpu = -1;
 559         if (!evsel->system_wide && evlist->threads && thread >= 0)
 560                 sid->tid = thread_map__pid(evlist->threads, thread);
 561         else
 562                 sid->tid = -1;
 563 }
 564
 565 struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id)
 566 {
 567         struct hlist_head *head;
 568         struct perf_sample_id *sid;
 569         int hash;
 570
 571         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 572         head = &evlist->heads[hash];
 573
 574         hlist_for_each_entry(sid, head, node)
 575                 if (sid->id == id)
 576                         return sid;
 577
 578         return NULL;
 579 }
 580
 581 struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
 582 {
 583         struct perf_sample_id *sid;
 584
 585         if (evlist->core.nr_entries == 1 || !id)
 586                 return perf_evlist__first(evlist);
 587
 588         sid = perf_evlist__id2sid(evlist, id);
 589         if (sid)
 590                 return sid->evsel;
 591
 592         if (!perf_evlist__sample_id_all(evlist))
 593                 return perf_evlist__first(evlist);
 594
 595         return NULL;
 596 }
 597
 598 struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
 599                                                 u64 id)
 600 {
 601         struct perf_sample_id *sid;
 602
 603         if (!id)
 604                 return NULL;
 605
 606         sid = perf_evlist__id2sid(evlist, id);
 607         if (sid)
 608                 return sid->evsel;
 609
 610         return NULL;
 611 }
 612
 613 static int perf_evlist__event2id(struct evlist *evlist,
 614                                  union perf_event *event, u64 *id)
 615 {
 616         const u64 *array = event->sample.array;
 617         ssize_t n;
 618
 619         n = (event->header.size - sizeof(event->header)) >> 3;
 620
 621         if (event->header.type == PERF_RECORD_SAMPLE) {
 622                 if (evlist->id_pos >= n)
 623                         return -1;
 624                 *id = array[evlist->id_pos];
 625         } else {
 626                 if (evlist->is_pos > n)
 627                         return -1;
 628                 n -= evlist->is_pos;
 629                 *id = array[n];
 630         }
 631         return 0;
 632 }
 633
 634 struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
 635                                             union perf_event *event)
 636 {
 637         struct evsel *first = perf_evlist__first(evlist);
 638         struct hlist_head *head;
 639         struct perf_sample_id *sid;
 640         int hash;
 641         u64 id;
 642
 643         if (evlist->core.nr_entries == 1)
 644                 return first;
 645
 646         if (!first->core.attr.sample_id_all &&
 647             event->header.type != PERF_RECORD_SAMPLE)
 648                 return first;
 649
 650         if (perf_evlist__event2id(evlist, event, &id))
 651                 return NULL;
 652
 653         /* Synthesized events have an id of zero */
 654         if (!id)
 655                 return first;
 656
 657         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 658         head = &evlist->heads[hash];
 659
 660         hlist_for_each_entry(sid, head, node) {
 661                 if (sid->id == id)
 662                         return sid->evsel;
 663         }
 664         return NULL;
 665 }
 666
 667 static int perf_evlist__set_paused(struct evlist *evlist, bool value)
 668 {
 669         int i;
 670
 671         if (!evlist->overwrite_mmap)
 672                 return 0;
 673
 674         for (i = 0; i < evlist->nr_mmaps; i++) {
 675                 int fd = evlist->overwrite_mmap[i].fd;
 676                 int err;
 677
 678                 if (fd < 0)
 679                         continue;
 680                 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
 681                 if (err)
 682                         return err;
 683         }
 684         return 0;
 685 }
 686
 687 static int perf_evlist__pause(struct evlist *evlist)
 688 {
 689         return perf_evlist__set_paused(evlist, true);
 690 }
 691
 692 static int perf_evlist__resume(struct evlist *evlist)
 693 {
 694         return perf_evlist__set_paused(evlist, false);
 695 }
 696
 697 static void perf_evlist__munmap_nofree(struct evlist *evlist)
 698 {
 699         int i;
 700
 701         if (evlist->mmap)
 702                 for (i = 0; i < evlist->nr_mmaps; i++)
 703                         perf_mmap__munmap(&evlist->mmap[i]);
 704
 705         if (evlist->overwrite_mmap)
 706                 for (i = 0; i < evlist->nr_mmaps; i++)
 707                         perf_mmap__munmap(&evlist->overwrite_mmap[i]);
 708 }
 709
 710 void perf_evlist__munmap(struct evlist *evlist)
 711 {
 712         perf_evlist__munmap_nofree(evlist);
 713         zfree(&evlist->mmap);
 714         zfree(&evlist->overwrite_mmap);
 715 }
 716
 717 static struct perf_mmap *perf_evlist__alloc_mmap(struct evlist *evlist,
 718                                                  bool overwrite)
 719 {
 720         int i;
 721         struct perf_mmap *map;
 722
 723         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 724         if (cpu_map__empty(evlist->cpus))
 725                 evlist->nr_mmaps = thread_map__nr(evlist->threads);
 726         map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 727         if (!map)
 728                 return NULL;
 729
 730         for (i = 0; i < evlist->nr_mmaps; i++) {
 731                 map[i].fd = -1;
 732                 map[i].overwrite = overwrite;
 733                 /*
 734                  * When the perf_mmap() call is made we grab one refcount, plus
 735                  * one extra to let perf_mmap__consume() get the last
 736                  * events after all real references (perf_mmap__get()) are
 737                  * dropped.
 738                  *
 739                  * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 740                  * thus does perf_mmap__get() on it.
 741                  */
 742                 refcount_set(&map[i].refcnt, 0);
 743         }
 744         return map;
 745 }
 746
 747 static bool
 748 perf_evlist__should_poll(struct evlist *evlist __maybe_unused,
 749                          struct evsel *evsel)
 750 {
 751         if (evsel->core.attr.write_backward)
 752                 return false;
 753         return true;
 754 }
 755
 756 static int perf_evlist__mmap_per_evsel(struct evlist *evlist, int idx,
 757                                        struct mmap_params *mp, int cpu_idx,
 758                                        int thread, int *_output, int *_output_overwrite)
 759 {
 760         struct evsel *evsel;
 761         int revent;
 762         int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
 763
 764         evlist__for_each_entry(evlist, evsel) {
 765                 struct perf_mmap *maps = evlist->mmap;
 766                 int *output = _output;
 767                 int fd;
 768                 int cpu;
 769
 770                 mp->prot = PROT_READ | PROT_WRITE;
 771                 if (evsel->core.attr.write_backward) {
 772                         output = _output_overwrite;
 773                         maps = evlist->overwrite_mmap;
 774
 775                         if (!maps) {
 776                                 maps = perf_evlist__alloc_mmap(evlist, true);
 777                                 if (!maps)
 778                                         return -1;
 779                                 evlist->overwrite_mmap = maps;
 780                                 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
 781                                         perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 782                         }
 783                         mp->prot &= ~PROT_WRITE;
 784                 }
 785
 786                 if (evsel->system_wide && thread)
 787                         continue;
 788
 789                 cpu = cpu_map__idx(evsel->core.cpus, evlist_cpu);
 790                 if (cpu == -1)
 791                         continue;
 792
 793                 fd = FD(evsel, cpu, thread);
 794
 795                 if (*output == -1) {
 796                         *output = fd;
 797
 798                         if (perf_mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
 799                                 return -1;
 800                 } else {
 801                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
 802                                 return -1;
 803
 804                         perf_mmap__get(&maps[idx]);
 805                 }
 806
 807                 revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
 808
 809                 /*
 810                  * The system_wide flag causes a selected event to be opened
 811                  * always without a pid.  Consequently it will never get a
 812                  * POLLHUP, but it is used for tracking in combination with
 813                  * other events, so it should not need to be polled anyway.
 814                  * Therefore don't add it for polling.
 815                  */
 816                 if (!evsel->system_wide &&
 817                     __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
 818                         perf_mmap__put(&maps[idx]);
 819                         return -1;
 820                 }
 821
 822                 if (evsel->core.attr.read_format & PERF_FORMAT_ID) {
 823                         if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
 824                                                    fd) < 0)
 825                                 return -1;
 826                         perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
 827                                                  thread);
 828                 }
 829         }
 830
 831         return 0;
 832 }
 833
 834 static int perf_evlist__mmap_per_cpu(struct evlist *evlist,
 835                                      struct mmap_params *mp)
 836 {
 837         int cpu, thread;
 838         int nr_cpus = cpu_map__nr(evlist->cpus);
 839         int nr_threads = thread_map__nr(evlist->threads);
 840
 841         pr_debug2("perf event ring buffer mmapped per cpu\n");
 842         for (cpu = 0; cpu < nr_cpus; cpu++) {
 843                 int output = -1;
 844                 int output_overwrite = -1;
 845
 846                 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
 847                                               true);
 848
 849                 for (thread = 0; thread < nr_threads; thread++) {
 850                         if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
 851                                                         thread, &output, &output_overwrite))
 852                                 goto out_unmap;
 853                 }
 854         }
 855
 856         return 0;
 857
 858 out_unmap:
 859         perf_evlist__munmap_nofree(evlist);
 860         return -1;
 861 }
 862
 863 static int perf_evlist__mmap_per_thread(struct evlist *evlist,
 864                                         struct mmap_params *mp)
 865 {
 866         int thread;
 867         int nr_threads = thread_map__nr(evlist->threads);
 868
 869         pr_debug2("perf event ring buffer mmapped per thread\n");
 870         for (thread = 0; thread < nr_threads; thread++) {
 871                 int output = -1;
 872                 int output_overwrite = -1;
 873
 874                 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
 875                                               false);
 876
 877                 if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
 878                                                 &output, &output_overwrite))
 879                         goto out_unmap;
 880         }
 881
 882         return 0;
 883
 884 out_unmap:
 885         perf_evlist__munmap_nofree(evlist);
 886         return -1;
 887 }
 888
 889 unsigned long perf_event_mlock_kb_in_pages(void)
 890 {
 891         unsigned long pages;
 892         int max;
 893
 894         if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
 895                 /*
 896                  * Pick a once upon a time good value, i.e. things look
 897                  * strange since we can't read a sysctl value, but lets not
 898                  * die yet...
 899                  */
 900                 max = 512;
 901         } else {
 902                 max -= (page_size / 1024);
 903         }
 904
 905         pages = (max * 1024) / page_size;
 906         if (!is_power_of_2(pages))
 907                 pages = rounddown_pow_of_two(pages);
 908
 909         return pages;
 910 }
 911
 912 size_t perf_evlist__mmap_size(unsigned long pages)
 913 {
 914         if (pages == UINT_MAX)
 915                 pages = perf_event_mlock_kb_in_pages();
 916         else if (!is_power_of_2(pages))
 917                 return 0;
 918
 919         return (pages + 1) * page_size;
 920 }
 921
 922 static long parse_pages_arg(const char *str, unsigned long min,
 923                             unsigned long max)
 924 {
 925         unsigned long pages, val;
 926         static struct parse_tag tags[] = {
 927                 { .tag  = 'B', .mult = 1       },
 928                 { .tag  = 'K', .mult = 1 << 10 },
 929                 { .tag  = 'M', .mult = 1 << 20 },
 930                 { .tag  = 'G', .mult = 1 << 30 },
 931                 { .tag  = 0 },
 932         };
 933
 934         if (str == NULL)
 935                 return -EINVAL;
 936
 937         val = parse_tag_value(str, tags);
 938         if (val != (unsigned long) -1) {
 939                 /* we got file size value */
 940                 pages = PERF_ALIGN(val, page_size) / page_size;
 941         } else {
 942                 /* we got pages count value */
 943                 char *eptr;
 944                 pages = strtoul(str, &eptr, 10);
 945                 if (*eptr != '\0')
 946                         return -EINVAL;
 947         }
 948
 949         if (pages == 0 && min == 0) {
 950                 /* leave number of pages at 0 */
 951         } else if (!is_power_of_2(pages)) {
 952                 char buf[100];
 953
 954                 /* round pages up to next power of 2 */
 955                 pages = roundup_pow_of_two(pages);
 956                 if (!pages)
 957                         return -EINVAL;
 958
 959                 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
 960                 pr_info("rounding mmap pages size to %s (%lu pages)\n",
 961                         buf, pages);
 962         }
 963
 964         if (pages > max)
 965                 return -EINVAL;
 966
 967         return pages;
 968 }
 969
 970 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
 971 {
 972         unsigned long max = UINT_MAX;
 973         long pages;
 974
 975         if (max > SIZE_MAX / page_size)
 976                 max = SIZE_MAX / page_size;
 977
 978         pages = parse_pages_arg(str, 1, max);
 979         if (pages < 0) {
 980                 pr_err("Invalid argument for --mmap_pages/-m\n");
 981                 return -1;
 982         }
 983
 984         *mmap_pages = pages;
 985         return 0;
 986 }
 987
 988 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
 989                                   int unset __maybe_unused)
 990 {
 991         return __perf_evlist__parse_mmap_pages(opt->value, str);
 992 }
 993
 994 /**
 995  * perf_evlist__mmap_ex - Create mmaps to receive events.
 996  * @evlist: list of events
 997  * @pages: map length in pages
 998  * @overwrite: overwrite older events?
 999  * @auxtrace_pages - auxtrace map length in pages
1000  * @auxtrace_overwrite - overwrite older auxtrace data?
1001  *
1002  * If @overwrite is %false the user needs to signal event consumption using
1003  * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
1004  * automatically.
1005  *
1006  * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1007  * consumption using auxtrace_mmap__write_tail().
1008  *
1009  * Return: %0 on success, negative error code otherwise.
1010  */
1011 int perf_evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
1012                          unsigned int auxtrace_pages,
1013                          bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
1014                          int comp_level)
1015 {
1016         struct evsel *evsel;
1017         const struct perf_cpu_map *cpus = evlist->cpus;
1018         const struct perf_thread_map *threads = evlist->threads;
1019         /*
1020          * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1021          * Its value is decided by evsel's write_backward.
1022          * So &mp should not be passed through const pointer.
1023          */
1024         struct mmap_params mp = { .nr_cblocks = nr_cblocks, .affinity = affinity, .flush = flush,
1025                                   .comp_level = comp_level };
1026
1027         if (!evlist->mmap)
1028                 evlist->mmap = perf_evlist__alloc_mmap(evlist, false);
1029         if (!evlist->mmap)
1030                 return -ENOMEM;
1031
1032         if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
1033                 return -ENOMEM;
1034
1035         evlist->mmap_len = perf_evlist__mmap_size(pages);
1036         pr_debug("mmap size %zuB\n", evlist->mmap_len);
1037         mp.mask = evlist->mmap_len - page_size - 1;
1038
1039         auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
1040                                    auxtrace_pages, auxtrace_overwrite);
1041
1042         evlist__for_each_entry(evlist, evsel) {
1043                 if ((evsel->core.attr.read_format & PERF_FORMAT_ID) &&
1044                     evsel->sample_id == NULL &&
1045                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
1046                         return -ENOMEM;
1047         }
1048
1049         if (cpu_map__empty(cpus))
1050                 return perf_evlist__mmap_per_thread(evlist, &mp);
1051
1052         return perf_evlist__mmap_per_cpu(evlist, &mp);
1053 }
1054
1055 int perf_evlist__mmap(struct evlist *evlist, unsigned int pages)
1056 {
1057         return perf_evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
1058 }
1059
1060 int perf_evlist__create_maps(struct evlist *evlist, struct target *target)
1061 {
1062         bool all_threads = (target->per_thread && target->system_wide);
1063         struct perf_cpu_map *cpus;
1064         struct perf_thread_map *threads;
1065
1066         /*
1067          * If specify '-a' and '--per-thread' to perf record, perf record
1068          * will override '--per-thread'. target->per_thread = false and
1069          * target->system_wide = true.
1070          *
1071          * If specify '--per-thread' only to perf record,
1072          * target->per_thread = true and target->system_wide = false.
1073          *
1074          * So target->per_thread && target->system_wide is false.
1075          * For perf record, thread_map__new_str doesn't call
1076          * thread_map__new_all_cpus. That will keep perf record's
1077          * current behavior.
1078          *
1079          * For perf stat, it allows the case that target->per_thread and
1080          * target->system_wide are all true. It means to collect system-wide
1081          * per-thread data. thread_map__new_str will call
1082          * thread_map__new_all_cpus to enumerate all threads.
1083          */
1084         threads = thread_map__new_str(target->pid, target->tid, target->uid,
1085                                       all_threads);
1086
1087         if (!threads)
1088                 return -1;
1089
1090         if (target__uses_dummy_map(target))
1091                 cpus = perf_cpu_map__dummy_new();
1092         else
1093                 cpus = perf_cpu_map__new(target->cpu_list);
1094
1095         if (!cpus)
1096                 goto out_delete_threads;
1097
1098         evlist->core.has_user_cpus = !!target->cpu_list;
1099
1100         perf_evlist__set_maps(evlist, cpus, threads);
1101
1102         return 0;
1103
1104 out_delete_threads:
1105         perf_thread_map__put(threads);
1106         return -1;
1107 }
1108
1109 void perf_evlist__set_maps(struct evlist *evlist, struct perf_cpu_map *cpus,
1110                            struct perf_thread_map *threads)
1111 {
1112         /*
1113          * Allow for the possibility that one or another of the maps isn't being
1114          * changed i.e. don't put it.  Note we are assuming the maps that are
1115          * being applied are brand new and evlist is taking ownership of the
1116          * original reference count of 1.  If that is not the case it is up to
1117          * the caller to increase the reference count.
1118          */
1119         if (cpus != evlist->cpus) {
1120                 perf_cpu_map__put(evlist->cpus);
1121                 evlist->cpus = perf_cpu_map__get(cpus);
1122         }
1123
1124         if (threads != evlist->threads) {
1125                 perf_thread_map__put(evlist->threads);
1126                 evlist->threads = perf_thread_map__get(threads);
1127         }
1128
1129         perf_evlist__propagate_maps(evlist);
1130 }
1131
1132 void __perf_evlist__set_sample_bit(struct evlist *evlist,
1133                                    enum perf_event_sample_format bit)
1134 {
1135         struct evsel *evsel;
1136
1137         evlist__for_each_entry(evlist, evsel)
1138                 __perf_evsel__set_sample_bit(evsel, bit);
1139 }
1140
1141 void __perf_evlist__reset_sample_bit(struct evlist *evlist,
1142                                      enum perf_event_sample_format bit)
1143 {
1144         struct evsel *evsel;
1145
1146         evlist__for_each_entry(evlist, evsel)
1147                 __perf_evsel__reset_sample_bit(evsel, bit);
1148 }
1149
1150 int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
1151 {
1152         struct evsel *evsel;
1153         int err = 0;
1154
1155         evlist__for_each_entry(evlist, evsel) {
1156                 if (evsel->filter == NULL)
1157                         continue;
1158
1159                 /*
1160                  * filters only work for tracepoint event, which doesn't have cpu limit.
1161                  * So evlist and evsel should always be same.
1162                  */
1163                 err = evsel__apply_filter(evsel, evsel->filter);
1164                 if (err) {
1165                         *err_evsel = evsel;
1166                         break;
1167                 }
1168         }
1169
1170         return err;
1171 }
1172
1173 int perf_evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1174 {
1175         struct evsel *evsel;
1176         int err = 0;
1177
1178         evlist__for_each_entry(evlist, evsel) {
1179                 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1180                         continue;
1181
1182                 err = perf_evsel__set_filter(evsel, filter);
1183                 if (err)
1184                         break;
1185         }
1186
1187         return err;
1188 }
1189
1190 int perf_evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1191 {
1192         char *filter;
1193         int ret = -1;
1194         size_t i;
1195
1196         for (i = 0; i < npids; ++i) {
1197                 if (i == 0) {
1198                         if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1199                                 return -1;
1200                 } else {
1201                         char *tmp;
1202
1203                         if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1204                                 goto out_free;
1205
1206                         free(filter);
1207                         filter = tmp;
1208                 }
1209         }
1210
1211         ret = perf_evlist__set_tp_filter(evlist, filter);
1212 out_free:
1213         free(filter);
1214         return ret;
1215 }
1216
1217 int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
1218 {
1219         return perf_evlist__set_tp_filter_pids(evlist, 1, &pid);
1220 }
1221
1222 bool perf_evlist__valid_sample_type(struct evlist *evlist)
1223 {
1224         struct evsel *pos;
1225
1226         if (evlist->core.nr_entries == 1)
1227                 return true;
1228
1229         if (evlist->id_pos < 0 || evlist->is_pos < 0)
1230                 return false;
1231
1232         evlist__for_each_entry(evlist, pos) {
1233                 if (pos->id_pos != evlist->id_pos ||
1234                     pos->is_pos != evlist->is_pos)
1235                         return false;
1236         }
1237
1238         return true;
1239 }
1240
1241 u64 __perf_evlist__combined_sample_type(struct evlist *evlist)
1242 {
1243         struct evsel *evsel;
1244
1245         if (evlist->combined_sample_type)
1246                 return evlist->combined_sample_type;
1247
1248         evlist__for_each_entry(evlist, evsel)
1249                 evlist->combined_sample_type |= evsel->core.attr.sample_type;
1250
1251         return evlist->combined_sample_type;
1252 }
1253
1254 u64 perf_evlist__combined_sample_type(struct evlist *evlist)
1255 {
1256         evlist->combined_sample_type = 0;
1257         return __perf_evlist__combined_sample_type(evlist);
1258 }
1259
1260 u64 perf_evlist__combined_branch_type(struct evlist *evlist)
1261 {
1262         struct evsel *evsel;
1263         u64 branch_type = 0;
1264
1265         evlist__for_each_entry(evlist, evsel)
1266                 branch_type |= evsel->core.attr.branch_sample_type;
1267         return branch_type;
1268 }
1269
1270 bool perf_evlist__valid_read_format(struct evlist *evlist)
1271 {
1272         struct evsel *first = perf_evlist__first(evlist), *pos = first;
1273         u64 read_format = first->core.attr.read_format;
1274         u64 sample_type = first->core.attr.sample_type;
1275
1276         evlist__for_each_entry(evlist, pos) {
1277                 if (read_format != pos->core.attr.read_format)
1278                         return false;
1279         }
1280
1281         /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1282         if ((sample_type & PERF_SAMPLE_READ) &&
1283             !(read_format & PERF_FORMAT_ID)) {
1284                 return false;
1285         }
1286
1287         return true;
1288 }
1289
1290 u64 perf_evlist__read_format(struct evlist *evlist)
1291 {
1292         struct evsel *first = perf_evlist__first(evlist);
1293         return first->core.attr.read_format;
1294 }
1295
1296 u16 perf_evlist__id_hdr_size(struct evlist *evlist)
1297 {
1298         struct evsel *first = perf_evlist__first(evlist);
1299         struct perf_sample *data;
1300         u64 sample_type;
1301         u16 size = 0;
1302
1303         if (!first->core.attr.sample_id_all)
1304                 goto out;
1305
1306         sample_type = first->core.attr.sample_type;
1307
1308         if (sample_type & PERF_SAMPLE_TID)
1309                 size += sizeof(data->tid) * 2;
1310
1311        if (sample_type & PERF_SAMPLE_TIME)
1312                 size += sizeof(data->time);
1313
1314         if (sample_type & PERF_SAMPLE_ID)
1315                 size += sizeof(data->id);
1316
1317         if (sample_type & PERF_SAMPLE_STREAM_ID)
1318                 size += sizeof(data->stream_id);
1319
1320         if (sample_type & PERF_SAMPLE_CPU)
1321                 size += sizeof(data->cpu) * 2;
1322
1323         if (sample_type & PERF_SAMPLE_IDENTIFIER)
1324                 size += sizeof(data->id);
1325 out:
1326         return size;
1327 }
1328
1329 bool perf_evlist__valid_sample_id_all(struct evlist *evlist)
1330 {
1331         struct evsel *first = perf_evlist__first(evlist), *pos = first;
1332
1333         evlist__for_each_entry_continue(evlist, pos) {
1334                 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1335                         return false;
1336         }
1337
1338         return true;
1339 }
1340
1341 bool perf_evlist__sample_id_all(struct evlist *evlist)
1342 {
1343         struct evsel *first = perf_evlist__first(evlist);
1344         return first->core.attr.sample_id_all;
1345 }
1346
1347 void perf_evlist__set_selected(struct evlist *evlist,
1348                                struct evsel *evsel)
1349 {
1350         evlist->selected = evsel;
1351 }
1352
1353 void evlist__close(struct evlist *evlist)
1354 {
1355         struct evsel *evsel;
1356
1357         evlist__for_each_entry_reverse(evlist, evsel)
1358                 perf_evsel__close(evsel);
1359 }
1360
1361 static int perf_evlist__create_syswide_maps(struct evlist *evlist)
1362 {
1363         struct perf_cpu_map *cpus;
1364         struct perf_thread_map *threads;
1365         int err = -ENOMEM;
1366
1367         /*
1368          * Try reading /sys/devices/system/cpu/online to get
1369          * an all cpus map.
1370          *
1371          * FIXME: -ENOMEM is the best we can do here, the cpu_map
1372          * code needs an overhaul to properly forward the
1373          * error, and we may not want to do that fallback to a
1374          * default cpu identity map :-\
1375          */
1376         cpus = perf_cpu_map__new(NULL);
1377         if (!cpus)
1378                 goto out;
1379
1380         threads = perf_thread_map__new_dummy();
1381         if (!threads)
1382                 goto out_put;
1383
1384         perf_evlist__set_maps(evlist, cpus, threads);
1385 out:
1386         return err;
1387 out_put:
1388         perf_cpu_map__put(cpus);
1389         goto out;
1390 }
1391
1392 int evlist__open(struct evlist *evlist)
1393 {
1394         struct evsel *evsel;
1395         int err;
1396
1397         /*
1398          * Default: one fd per CPU, all threads, aka systemwide
1399          * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1400          */
1401         if (evlist->threads == NULL && evlist->cpus == NULL) {
1402                 err = perf_evlist__create_syswide_maps(evlist);
1403                 if (err < 0)
1404                         goto out_err;
1405         }
1406
1407         perf_evlist__update_id_pos(evlist);
1408
1409         evlist__for_each_entry(evlist, evsel) {
1410                 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1411                 if (err < 0)
1412                         goto out_err;
1413         }
1414
1415         return 0;
1416 out_err:
1417         evlist__close(evlist);
1418         errno = -err;
1419         return err;
1420 }
1421
1422 int perf_evlist__prepare_workload(struct evlist *evlist, struct target *target,
1423                                   const char *argv[], bool pipe_output,
1424                                   void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1425 {
1426         int child_ready_pipe[2], go_pipe[2];
1427         char bf;
1428
1429         if (pipe(child_ready_pipe) < 0) {
1430                 perror("failed to create 'ready' pipe");
1431                 return -1;
1432         }
1433
1434         if (pipe(go_pipe) < 0) {
1435                 perror("failed to create 'go' pipe");
1436                 goto out_close_ready_pipe;
1437         }
1438
1439         evlist->workload.pid = fork();
1440         if (evlist->workload.pid < 0) {
1441                 perror("failed to fork");
1442                 goto out_close_pipes;
1443         }
1444
1445         if (!evlist->workload.pid) {
1446                 int ret;
1447
1448                 if (pipe_output)
1449                         dup2(2, 1);
1450
1451                 signal(SIGTERM, SIG_DFL);
1452
1453                 close(child_ready_pipe[0]);
1454                 close(go_pipe[1]);
1455                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1456
1457                 /*
1458                  * Tell the parent we're ready to go
1459                  */
1460                 close(child_ready_pipe[1]);
1461
1462                 /*
1463                  * Wait until the parent tells us to go.
1464                  */
1465                 ret = read(go_pipe[0], &bf, 1);
1466                 /*
1467                  * The parent will ask for the execvp() to be performed by
1468                  * writing exactly one byte, in workload.cork_fd, usually via
1469                  * perf_evlist__start_workload().
1470                  *
1471                  * For cancelling the workload without actually running it,
1472                  * the parent will just close workload.cork_fd, without writing
1473                  * anything, i.e. read will return zero and we just exit()
1474                  * here.
1475                  */
1476                 if (ret != 1) {
1477                         if (ret == -1)
1478                                 perror("unable to read pipe");
1479                         exit(ret);
1480                 }
1481
1482                 execvp(argv[0], (char **)argv);
1483
1484                 if (exec_error) {
1485                         union sigval val;
1486
1487                         val.sival_int = errno;
1488                         if (sigqueue(getppid(), SIGUSR1, val))
1489                                 perror(argv[0]);
1490                 } else
1491                         perror(argv[0]);
1492                 exit(-1);
1493         }
1494
1495         if (exec_error) {
1496                 struct sigaction act = {
1497                         .sa_flags     = SA_SIGINFO,
1498                         .sa_sigaction = exec_error,
1499                 };
1500                 sigaction(SIGUSR1, &act, NULL);
1501         }
1502
1503         if (target__none(target)) {
1504                 if (evlist->threads == NULL) {
1505                         fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1506                                 __func__, __LINE__);
1507                         goto out_close_pipes;
1508                 }
1509                 perf_thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
1510         }
1511
1512         close(child_ready_pipe[1]);
1513         close(go_pipe[0]);
1514         /*
1515          * wait for child to settle
1516          */
1517         if (read(child_ready_pipe[0], &bf, 1) == -1) {
1518                 perror("unable to read pipe");
1519                 goto out_close_pipes;
1520         }
1521
1522         fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1523         evlist->workload.cork_fd = go_pipe[1];
1524         close(child_ready_pipe[0]);
1525         return 0;
1526
1527 out_close_pipes:
1528         close(go_pipe[0]);
1529         close(go_pipe[1]);
1530 out_close_ready_pipe:
1531         close(child_ready_pipe[0]);
1532         close(child_ready_pipe[1]);
1533         return -1;
1534 }
1535
1536 int perf_evlist__start_workload(struct evlist *evlist)
1537 {
1538         if (evlist->workload.cork_fd > 0) {
1539                 char bf = 0;
1540                 int ret;
1541                 /*
1542                  * Remove the cork, let it rip!
1543                  */
1544                 ret = write(evlist->workload.cork_fd, &bf, 1);
1545                 if (ret < 0)
1546                         perror("unable to write to pipe");
1547
1548                 close(evlist->workload.cork_fd);
1549                 return ret;
1550         }
1551
1552         return 0;
1553 }
1554
1555 int perf_evlist__parse_sample(struct evlist *evlist, union perf_event *event,
1556                               struct perf_sample *sample)
1557 {
1558         struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1559
1560         if (!evsel)
1561                 return -EFAULT;
1562         return perf_evsel__parse_sample(evsel, event, sample);
1563 }
1564
1565 int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
1566                                         union perf_event *event,
1567                                         u64 *timestamp)
1568 {
1569         struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1570
1571         if (!evsel)
1572                 return -EFAULT;
1573         return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1574 }
1575
1576 size_t perf_evlist__fprintf(struct evlist *evlist, FILE *fp)
1577 {
1578         struct evsel *evsel;
1579         size_t printed = 0;
1580
1581         evlist__for_each_entry(evlist, evsel) {
1582                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1583                                    perf_evsel__name(evsel));
1584         }
1585
1586         return printed + fprintf(fp, "\n");
1587 }
1588
1589 int perf_evlist__strerror_open(struct evlist *evlist,
1590                                int err, char *buf, size_t size)
1591 {
1592         int printed, value;
1593         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1594
1595         switch (err) {
1596         case EACCES:
1597         case EPERM:
1598                 printed = scnprintf(buf, size,
1599                                     "Error:\t%s.\n"
1600                                     "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1601
1602                 value = perf_event_paranoid();
1603
1604                 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1605
1606                 if (value >= 2) {
1607                         printed += scnprintf(buf + printed, size - printed,
1608                                              "For your workloads it needs to be <= 1\nHint:\t");
1609                 }
1610                 printed += scnprintf(buf + printed, size - printed,
1611                                      "For system wide tracing it needs to be set to -1.\n");
1612
1613                 printed += scnprintf(buf + printed, size - printed,
1614                                     "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1615                                     "Hint:\tThe current value is %d.", value);
1616                 break;
1617         case EINVAL: {
1618                 struct evsel *first = perf_evlist__first(evlist);
1619                 int max_freq;
1620
1621                 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1622                         goto out_default;
1623
1624                 if (first->core.attr.sample_freq < (u64)max_freq)
1625                         goto out_default;
1626
1627                 printed = scnprintf(buf, size,
1628                                     "Error:\t%s.\n"
1629                                     "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1630                                     "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1631                                     emsg, max_freq, first->core.attr.sample_freq);
1632                 break;
1633         }
1634         default:
1635 out_default:
1636                 scnprintf(buf, size, "%s", emsg);
1637                 break;
1638         }
1639
1640         return 0;
1641 }
1642
1643 int perf_evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1644 {
1645         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1646         int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
1647
1648         switch (err) {
1649         case EPERM:
1650                 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1651                 printed += scnprintf(buf + printed, size - printed,
1652                                      "Error:\t%s.\n"
1653                                      "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1654                                      "Hint:\tTried using %zd kB.\n",
1655                                      emsg, pages_max_per_user, pages_attempted);
1656
1657                 if (pages_attempted >= pages_max_per_user) {
1658                         printed += scnprintf(buf + printed, size - printed,
1659                                              "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1660                                              pages_max_per_user + pages_attempted);
1661                 }
1662
1663                 printed += scnprintf(buf + printed, size - printed,
1664                                      "Hint:\tTry using a smaller -m/--mmap-pages value.");
1665                 break;
1666         default:
1667                 scnprintf(buf, size, "%s", emsg);
1668                 break;
1669         }
1670
1671         return 0;
1672 }
1673
1674 void perf_evlist__to_front(struct evlist *evlist,
1675                            struct evsel *move_evsel)
1676 {
1677         struct evsel *evsel, *n;
1678         LIST_HEAD(move);
1679
1680         if (move_evsel == perf_evlist__first(evlist))
1681                 return;
1682
1683         evlist__for_each_entry_safe(evlist, n, evsel) {
1684                 if (evsel->leader == move_evsel->leader)
1685                         list_move_tail(&evsel->core.node, &move);
1686         }
1687
1688         list_splice(&move, &evlist->core.entries);
1689 }
1690
1691 void perf_evlist__set_tracking_event(struct evlist *evlist,
1692                                      struct evsel *tracking_evsel)
1693 {
1694         struct evsel *evsel;
1695
1696         if (tracking_evsel->tracking)
1697                 return;
1698
1699         evlist__for_each_entry(evlist, evsel) {
1700                 if (evsel != tracking_evsel)
1701                         evsel->tracking = false;
1702         }
1703
1704         tracking_evsel->tracking = true;
1705 }
1706
1707 struct evsel *
1708 perf_evlist__find_evsel_by_str(struct evlist *evlist,
1709                                const char *str)
1710 {
1711         struct evsel *evsel;
1712
1713         evlist__for_each_entry(evlist, evsel) {
1714                 if (!evsel->name)
1715                         continue;
1716                 if (strcmp(str, evsel->name) == 0)
1717                         return evsel;
1718         }
1719
1720         return NULL;
1721 }
1722
1723 void perf_evlist__toggle_bkw_mmap(struct evlist *evlist,
1724                                   enum bkw_mmap_state state)
1725 {
1726         enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1727         enum action {
1728                 NONE,
1729                 PAUSE,
1730                 RESUME,
1731         } action = NONE;
1732
1733         if (!evlist->overwrite_mmap)
1734                 return;
1735
1736         switch (old_state) {
1737         case BKW_MMAP_NOTREADY: {
1738                 if (state != BKW_MMAP_RUNNING)
1739                         goto state_err;
1740                 break;
1741         }
1742         case BKW_MMAP_RUNNING: {
1743                 if (state != BKW_MMAP_DATA_PENDING)
1744                         goto state_err;
1745                 action = PAUSE;
1746                 break;
1747         }
1748         case BKW_MMAP_DATA_PENDING: {
1749                 if (state != BKW_MMAP_EMPTY)
1750                         goto state_err;
1751                 break;
1752         }
1753         case BKW_MMAP_EMPTY: {
1754                 if (state != BKW_MMAP_RUNNING)
1755                         goto state_err;
1756                 action = RESUME;
1757                 break;
1758         }
1759         default:
1760                 WARN_ONCE(1, "Shouldn't get there\n");
1761         }
1762
1763         evlist->bkw_mmap_state = state;
1764
1765         switch (action) {
1766         case PAUSE:
1767                 perf_evlist__pause(evlist);
1768                 break;
1769         case RESUME:
1770                 perf_evlist__resume(evlist);
1771                 break;
1772         case NONE:
1773         default:
1774                 break;
1775         }
1776
1777 state_err:
1778         return;
1779 }
1780
1781 bool perf_evlist__exclude_kernel(struct evlist *evlist)
1782 {
1783         struct evsel *evsel;
1784
1785         evlist__for_each_entry(evlist, evsel) {
1786                 if (!evsel->core.attr.exclude_kernel)
1787                         return false;
1788         }
1789
1790         return true;
1791 }
1792
1793 /*
1794  * Events in data file are not collect in groups, but we still want
1795  * the group display. Set the artificial group and set the leader's
1796  * forced_leader flag to notify the display code.
1797  */
1798 void perf_evlist__force_leader(struct evlist *evlist)
1799 {
1800         if (!evlist->nr_groups) {
1801                 struct evsel *leader = perf_evlist__first(evlist);
1802
1803                 perf_evlist__set_leader(evlist);
1804                 leader->forced_leader = true;
1805         }
1806 }
1807
1808 struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list,
1809                                                  struct evsel *evsel)
1810 {
1811         struct evsel *c2, *leader;
1812         bool is_open = true;
1813
1814         leader = evsel->leader;
1815         pr_debug("Weak group for %s/%d failed\n",
1816                         leader->name, leader->nr_members);
1817
1818         /*
1819          * for_each_group_member doesn't work here because it doesn't
1820          * include the first entry.
1821          */
1822         evlist__for_each_entry(evsel_list, c2) {
1823                 if (c2 == evsel)
1824                         is_open = false;
1825                 if (c2->leader == leader) {
1826                         if (is_open)
1827                                 perf_evsel__close(c2);
1828                         c2->leader = c2;
1829                         c2->nr_members = 0;
1830                 }
1831         }
1832         return leader;
1833 }
1834
1835 int perf_evlist__add_sb_event(struct evlist **evlist,
1836                               struct perf_event_attr *attr,
1837                               perf_evsel__sb_cb_t cb,
1838                               void *data)
1839 {
1840         struct evsel *evsel;
1841         bool new_evlist = (*evlist) == NULL;
1842
1843         if (*evlist == NULL)
1844                 *evlist = evlist__new();
1845         if (*evlist == NULL)
1846                 return -1;
1847
1848         if (!attr->sample_id_all) {
1849                 pr_warning("enabling sample_id_all for all side band events\n");
1850                 attr->sample_id_all = 1;
1851         }
1852
1853         evsel = perf_evsel__new_idx(attr, (*evlist)->core.nr_entries);
1854         if (!evsel)
1855                 goto out_err;
1856
1857         evsel->side_band.cb = cb;
1858         evsel->side_band.data = data;
1859         evlist__add(*evlist, evsel);
1860         return 0;
1861
1862 out_err:
1863         if (new_evlist) {
1864                 evlist__delete(*evlist);
1865                 *evlist = NULL;
1866         }
1867         return -1;
1868 }
1869
1870 static void *perf_evlist__poll_thread(void *arg)
1871 {
1872         struct evlist *evlist = arg;
1873         bool draining = false;
1874         int i, done = 0;
1875
1876         while (!done) {
1877                 bool got_data = false;
1878
1879                 if (evlist->thread.done)
1880                         draining = true;
1881
1882                 if (!draining)
1883                         perf_evlist__poll(evlist, 1000);
1884
1885                 for (i = 0; i < evlist->nr_mmaps; i++) {
1886                         struct perf_mmap *map = &evlist->mmap[i];
1887                         union perf_event *event;
1888
1889                         if (perf_mmap__read_init(map))
1890                                 continue;
1891                         while ((event = perf_mmap__read_event(map)) != NULL) {
1892                                 struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1893
1894                                 if (evsel && evsel->side_band.cb)
1895                                         evsel->side_band.cb(event, evsel->side_band.data);
1896                                 else
1897                                         pr_warning("cannot locate proper evsel for the side band event\n");
1898
1899                                 perf_mmap__consume(map);
1900                                 got_data = true;
1901                         }
1902                         perf_mmap__read_done(map);
1903                 }
1904
1905                 if (draining && !got_data)
1906                         break;
1907         }
1908         return NULL;
1909 }
1910
1911 int perf_evlist__start_sb_thread(struct evlist *evlist,
1912                                  struct target *target)
1913 {
1914         struct evsel *counter;
1915
1916         if (!evlist)
1917                 return 0;
1918
1919         if (perf_evlist__create_maps(evlist, target))
1920                 goto out_delete_evlist;
1921
1922         evlist__for_each_entry(evlist, counter) {
1923                 if (evsel__open(counter, evlist->cpus,
1924                                      evlist->threads) < 0)
1925                         goto out_delete_evlist;
1926         }
1927
1928         if (perf_evlist__mmap(evlist, UINT_MAX))
1929                 goto out_delete_evlist;
1930
1931         evlist__for_each_entry(evlist, counter) {
1932                 if (evsel__enable(counter))
1933                         goto out_delete_evlist;
1934         }
1935
1936         evlist->thread.done = 0;
1937         if (pthread_create(&evlist->thread.th, NULL, perf_evlist__poll_thread, evlist))
1938                 goto out_delete_evlist;
1939
1940         return 0;
1941
1942 out_delete_evlist:
1943         evlist__delete(evlist);
1944         evlist = NULL;
1945         return -1;
1946 }
1947
1948 void perf_evlist__stop_sb_thread(struct evlist *evlist)
1949 {
1950         if (!evlist)
1951                 return;
1952         evlist->thread.done = 1;
1953         pthread_join(evlist->thread.th, NULL);
1954         evlist__delete(evlist);
1955 }