linux/tools/perf/util/evlist.c
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   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 "util/mmap.h"
  14#include "thread_map.h"
  15#include "target.h"
  16#include "evlist.h"
  17#include "evsel.h"
  18#include "debug.h"
  19#include "units.h"
  20#include <internal/lib.h> // page_size
  21#include "../perf.h"
  22#include "asm/bug.h"
  23#include "bpf-event.h"
  24#include <signal.h>
  25#include <unistd.h>
  26#include <sched.h>
  27#include <stdlib.h>
  28
  29#include "parse-events.h"
  30#include <subcmd/parse-options.h>
  31
  32#include <fcntl.h>
  33#include <sys/ioctl.h>
  34#include <sys/mman.h>
  35
  36#include <linux/bitops.h>
  37#include <linux/hash.h>
  38#include <linux/log2.h>
  39#include <linux/err.h>
  40#include <linux/string.h>
  41#include <linux/zalloc.h>
  42#include <perf/evlist.h>
  43#include <perf/evsel.h>
  44#include <perf/cpumap.h>
  45
  46#include <internal/xyarray.h>
  47
  48#ifdef LACKS_SIGQUEUE_PROTOTYPE
  49int sigqueue(pid_t pid, int sig, const union sigval value);
  50#endif
  51
  52#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
  53#define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
  54
  55void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
  56                  struct perf_thread_map *threads)
  57{
  58        perf_evlist__init(&evlist->core);
  59        perf_evlist__set_maps(&evlist->core, cpus, threads);
  60        fdarray__init(&evlist->core.pollfd, 64);
  61        evlist->workload.pid = -1;
  62        evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
  63}
  64
  65struct evlist *evlist__new(void)
  66{
  67        struct evlist *evlist = zalloc(sizeof(*evlist));
  68
  69        if (evlist != NULL)
  70                evlist__init(evlist, NULL, NULL);
  71
  72        return evlist;
  73}
  74
  75struct evlist *perf_evlist__new_default(void)
  76{
  77        struct evlist *evlist = evlist__new();
  78
  79        if (evlist && perf_evlist__add_default(evlist)) {
  80                evlist__delete(evlist);
  81                evlist = NULL;
  82        }
  83
  84        return evlist;
  85}
  86
  87struct evlist *perf_evlist__new_dummy(void)
  88{
  89        struct evlist *evlist = evlist__new();
  90
  91        if (evlist && perf_evlist__add_dummy(evlist)) {
  92                evlist__delete(evlist);
  93                evlist = NULL;
  94        }
  95
  96        return evlist;
  97}
  98
  99/**
 100 * perf_evlist__set_id_pos - set the positions of event ids.
 101 * @evlist: selected event list
 102 *
 103 * Events with compatible sample types all have the same id_pos
 104 * and is_pos.  For convenience, put a copy on evlist.
 105 */
 106void perf_evlist__set_id_pos(struct evlist *evlist)
 107{
 108        struct evsel *first = evlist__first(evlist);
 109
 110        evlist->id_pos = first->id_pos;
 111        evlist->is_pos = first->is_pos;
 112}
 113
 114static void perf_evlist__update_id_pos(struct evlist *evlist)
 115{
 116        struct evsel *evsel;
 117
 118        evlist__for_each_entry(evlist, evsel)
 119                perf_evsel__calc_id_pos(evsel);
 120
 121        perf_evlist__set_id_pos(evlist);
 122}
 123
 124static void evlist__purge(struct evlist *evlist)
 125{
 126        struct evsel *pos, *n;
 127
 128        evlist__for_each_entry_safe(evlist, n, pos) {
 129                list_del_init(&pos->core.node);
 130                pos->evlist = NULL;
 131                evsel__delete(pos);
 132        }
 133
 134        evlist->core.nr_entries = 0;
 135}
 136
 137void evlist__exit(struct evlist *evlist)
 138{
 139        zfree(&evlist->mmap);
 140        zfree(&evlist->overwrite_mmap);
 141        fdarray__exit(&evlist->core.pollfd);
 142}
 143
 144void evlist__delete(struct evlist *evlist)
 145{
 146        if (evlist == NULL)
 147                return;
 148
 149        evlist__munmap(evlist);
 150        evlist__close(evlist);
 151        perf_cpu_map__put(evlist->core.cpus);
 152        perf_thread_map__put(evlist->core.threads);
 153        evlist->core.cpus = NULL;
 154        evlist->core.threads = NULL;
 155        evlist__purge(evlist);
 156        evlist__exit(evlist);
 157        free(evlist);
 158}
 159
 160void evlist__add(struct evlist *evlist, struct evsel *entry)
 161{
 162        entry->evlist = evlist;
 163        entry->idx = evlist->core.nr_entries;
 164        entry->tracking = !entry->idx;
 165
 166        perf_evlist__add(&evlist->core, &entry->core);
 167
 168        if (evlist->core.nr_entries == 1)
 169                perf_evlist__set_id_pos(evlist);
 170}
 171
 172void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 173{
 174        evsel->evlist = NULL;
 175        perf_evlist__remove(&evlist->core, &evsel->core);
 176}
 177
 178void perf_evlist__splice_list_tail(struct evlist *evlist,
 179                                   struct list_head *list)
 180{
 181        struct evsel *evsel, *temp;
 182
 183        __evlist__for_each_entry_safe(list, temp, evsel) {
 184                list_del_init(&evsel->core.node);
 185                evlist__add(evlist, evsel);
 186        }
 187}
 188
 189void __perf_evlist__set_leader(struct list_head *list)
 190{
 191        struct evsel *evsel, *leader;
 192
 193        leader = list_entry(list->next, struct evsel, core.node);
 194        evsel = list_entry(list->prev, struct evsel, core.node);
 195
 196        leader->core.nr_members = evsel->idx - leader->idx + 1;
 197
 198        __evlist__for_each_entry(list, evsel) {
 199                evsel->leader = leader;
 200        }
 201}
 202
 203void perf_evlist__set_leader(struct evlist *evlist)
 204{
 205        if (evlist->core.nr_entries) {
 206                evlist->nr_groups = evlist->core.nr_entries > 1 ? 1 : 0;
 207                __perf_evlist__set_leader(&evlist->core.entries);
 208        }
 209}
 210
 211int __perf_evlist__add_default(struct evlist *evlist, bool precise)
 212{
 213        struct evsel *evsel = perf_evsel__new_cycles(precise);
 214
 215        if (evsel == NULL)
 216                return -ENOMEM;
 217
 218        evlist__add(evlist, evsel);
 219        return 0;
 220}
 221
 222int perf_evlist__add_dummy(struct evlist *evlist)
 223{
 224        struct perf_event_attr attr = {
 225                .type   = PERF_TYPE_SOFTWARE,
 226                .config = PERF_COUNT_SW_DUMMY,
 227                .size   = sizeof(attr), /* to capture ABI version */
 228        };
 229        struct evsel *evsel = perf_evsel__new_idx(&attr, evlist->core.nr_entries);
 230
 231        if (evsel == NULL)
 232                return -ENOMEM;
 233
 234        evlist__add(evlist, evsel);
 235        return 0;
 236}
 237
 238static int evlist__add_attrs(struct evlist *evlist,
 239                                  struct perf_event_attr *attrs, size_t nr_attrs)
 240{
 241        struct evsel *evsel, *n;
 242        LIST_HEAD(head);
 243        size_t i;
 244
 245        for (i = 0; i < nr_attrs; i++) {
 246                evsel = perf_evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
 247                if (evsel == NULL)
 248                        goto out_delete_partial_list;
 249                list_add_tail(&evsel->core.node, &head);
 250        }
 251
 252        perf_evlist__splice_list_tail(evlist, &head);
 253
 254        return 0;
 255
 256out_delete_partial_list:
 257        __evlist__for_each_entry_safe(&head, n, evsel)
 258                evsel__delete(evsel);
 259        return -1;
 260}
 261
 262int __perf_evlist__add_default_attrs(struct evlist *evlist,
 263                                     struct perf_event_attr *attrs, size_t nr_attrs)
 264{
 265        size_t i;
 266
 267        for (i = 0; i < nr_attrs; i++)
 268                event_attr_init(attrs + i);
 269
 270        return evlist__add_attrs(evlist, attrs, nr_attrs);
 271}
 272
 273struct evsel *
 274perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
 275{
 276        struct evsel *evsel;
 277
 278        evlist__for_each_entry(evlist, evsel) {
 279                if (evsel->core.attr.type   == PERF_TYPE_TRACEPOINT &&
 280                    (int)evsel->core.attr.config == id)
 281                        return evsel;
 282        }
 283
 284        return NULL;
 285}
 286
 287struct evsel *
 288perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
 289                                     const char *name)
 290{
 291        struct evsel *evsel;
 292
 293        evlist__for_each_entry(evlist, evsel) {
 294                if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
 295                    (strcmp(evsel->name, name) == 0))
 296                        return evsel;
 297        }
 298
 299        return NULL;
 300}
 301
 302int perf_evlist__add_newtp(struct evlist *evlist,
 303                           const char *sys, const char *name, void *handler)
 304{
 305        struct evsel *evsel = perf_evsel__newtp(sys, name);
 306
 307        if (IS_ERR(evsel))
 308                return -1;
 309
 310        evsel->handler = handler;
 311        evlist__add(evlist, evsel);
 312        return 0;
 313}
 314
 315static int perf_evlist__nr_threads(struct evlist *evlist,
 316                                   struct evsel *evsel)
 317{
 318        if (evsel->core.system_wide)
 319                return 1;
 320        else
 321                return perf_thread_map__nr(evlist->core.threads);
 322}
 323
 324void evlist__disable(struct evlist *evlist)
 325{
 326        struct evsel *pos;
 327
 328        evlist__for_each_entry(evlist, pos) {
 329                if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->core.fd)
 330                        continue;
 331                evsel__disable(pos);
 332        }
 333
 334        evlist->enabled = false;
 335}
 336
 337void evlist__enable(struct evlist *evlist)
 338{
 339        struct evsel *pos;
 340
 341        evlist__for_each_entry(evlist, pos) {
 342                if (!perf_evsel__is_group_leader(pos) || !pos->core.fd)
 343                        continue;
 344                evsel__enable(pos);
 345        }
 346
 347        evlist->enabled = true;
 348}
 349
 350void perf_evlist__toggle_enable(struct evlist *evlist)
 351{
 352        (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
 353}
 354
 355static int perf_evlist__enable_event_cpu(struct evlist *evlist,
 356                                         struct evsel *evsel, int cpu)
 357{
 358        int thread;
 359        int nr_threads = perf_evlist__nr_threads(evlist, evsel);
 360
 361        if (!evsel->core.fd)
 362                return -EINVAL;
 363
 364        for (thread = 0; thread < nr_threads; thread++) {
 365                int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 366                if (err)
 367                        return err;
 368        }
 369        return 0;
 370}
 371
 372static int perf_evlist__enable_event_thread(struct evlist *evlist,
 373                                            struct evsel *evsel,
 374                                            int thread)
 375{
 376        int cpu;
 377        int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
 378
 379        if (!evsel->core.fd)
 380                return -EINVAL;
 381
 382        for (cpu = 0; cpu < nr_cpus; cpu++) {
 383                int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 384                if (err)
 385                        return err;
 386        }
 387        return 0;
 388}
 389
 390int perf_evlist__enable_event_idx(struct evlist *evlist,
 391                                  struct evsel *evsel, int idx)
 392{
 393        bool per_cpu_mmaps = !perf_cpu_map__empty(evlist->core.cpus);
 394
 395        if (per_cpu_mmaps)
 396                return perf_evlist__enable_event_cpu(evlist, evsel, idx);
 397        else
 398                return perf_evlist__enable_event_thread(evlist, evsel, idx);
 399}
 400
 401int evlist__add_pollfd(struct evlist *evlist, int fd)
 402{
 403        return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN);
 404}
 405
 406static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
 407                                         void *arg __maybe_unused)
 408{
 409        struct mmap *map = fda->priv[fd].ptr;
 410
 411        if (map)
 412                perf_mmap__put(map);
 413}
 414
 415int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
 416{
 417        return fdarray__filter(&evlist->core.pollfd, revents_and_mask,
 418                               perf_evlist__munmap_filtered, NULL);
 419}
 420
 421int evlist__poll(struct evlist *evlist, int timeout)
 422{
 423        return perf_evlist__poll(&evlist->core, timeout);
 424}
 425
 426static void perf_evlist__set_sid_idx(struct evlist *evlist,
 427                                     struct evsel *evsel, int idx, int cpu,
 428                                     int thread)
 429{
 430        struct perf_sample_id *sid = SID(evsel, cpu, thread);
 431        sid->idx = idx;
 432        if (evlist->core.cpus && cpu >= 0)
 433                sid->cpu = evlist->core.cpus->map[cpu];
 434        else
 435                sid->cpu = -1;
 436        if (!evsel->core.system_wide && evlist->core.threads && thread >= 0)
 437                sid->tid = perf_thread_map__pid(evlist->core.threads, thread);
 438        else
 439                sid->tid = -1;
 440}
 441
 442struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id)
 443{
 444        struct hlist_head *head;
 445        struct perf_sample_id *sid;
 446        int hash;
 447
 448        hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 449        head = &evlist->core.heads[hash];
 450
 451        hlist_for_each_entry(sid, head, node)
 452                if (sid->id == id)
 453                        return sid;
 454
 455        return NULL;
 456}
 457
 458struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
 459{
 460        struct perf_sample_id *sid;
 461
 462        if (evlist->core.nr_entries == 1 || !id)
 463                return evlist__first(evlist);
 464
 465        sid = perf_evlist__id2sid(evlist, id);
 466        if (sid)
 467                return container_of(sid->evsel, struct evsel, core);
 468
 469        if (!perf_evlist__sample_id_all(evlist))
 470                return evlist__first(evlist);
 471
 472        return NULL;
 473}
 474
 475struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
 476                                                u64 id)
 477{
 478        struct perf_sample_id *sid;
 479
 480        if (!id)
 481                return NULL;
 482
 483        sid = perf_evlist__id2sid(evlist, id);
 484        if (sid)
 485                return container_of(sid->evsel, struct evsel, core);
 486
 487        return NULL;
 488}
 489
 490static int perf_evlist__event2id(struct evlist *evlist,
 491                                 union perf_event *event, u64 *id)
 492{
 493        const __u64 *array = event->sample.array;
 494        ssize_t n;
 495
 496        n = (event->header.size - sizeof(event->header)) >> 3;
 497
 498        if (event->header.type == PERF_RECORD_SAMPLE) {
 499                if (evlist->id_pos >= n)
 500                        return -1;
 501                *id = array[evlist->id_pos];
 502        } else {
 503                if (evlist->is_pos > n)
 504                        return -1;
 505                n -= evlist->is_pos;
 506                *id = array[n];
 507        }
 508        return 0;
 509}
 510
 511struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
 512                                            union perf_event *event)
 513{
 514        struct evsel *first = evlist__first(evlist);
 515        struct hlist_head *head;
 516        struct perf_sample_id *sid;
 517        int hash;
 518        u64 id;
 519
 520        if (evlist->core.nr_entries == 1)
 521                return first;
 522
 523        if (!first->core.attr.sample_id_all &&
 524            event->header.type != PERF_RECORD_SAMPLE)
 525                return first;
 526
 527        if (perf_evlist__event2id(evlist, event, &id))
 528                return NULL;
 529
 530        /* Synthesized events have an id of zero */
 531        if (!id)
 532                return first;
 533
 534        hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 535        head = &evlist->core.heads[hash];
 536
 537        hlist_for_each_entry(sid, head, node) {
 538                if (sid->id == id)
 539                        return container_of(sid->evsel, struct evsel, core);
 540        }
 541        return NULL;
 542}
 543
 544static int perf_evlist__set_paused(struct evlist *evlist, bool value)
 545{
 546        int i;
 547
 548        if (!evlist->overwrite_mmap)
 549                return 0;
 550
 551        for (i = 0; i < evlist->core.nr_mmaps; i++) {
 552                int fd = evlist->overwrite_mmap[i].core.fd;
 553                int err;
 554
 555                if (fd < 0)
 556                        continue;
 557                err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
 558                if (err)
 559                        return err;
 560        }
 561        return 0;
 562}
 563
 564static int perf_evlist__pause(struct evlist *evlist)
 565{
 566        return perf_evlist__set_paused(evlist, true);
 567}
 568
 569static int perf_evlist__resume(struct evlist *evlist)
 570{
 571        return perf_evlist__set_paused(evlist, false);
 572}
 573
 574static void evlist__munmap_nofree(struct evlist *evlist)
 575{
 576        int i;
 577
 578        if (evlist->mmap)
 579                for (i = 0; i < evlist->core.nr_mmaps; i++)
 580                        perf_mmap__munmap(&evlist->mmap[i]);
 581
 582        if (evlist->overwrite_mmap)
 583                for (i = 0; i < evlist->core.nr_mmaps; i++)
 584                        perf_mmap__munmap(&evlist->overwrite_mmap[i]);
 585}
 586
 587void evlist__munmap(struct evlist *evlist)
 588{
 589        evlist__munmap_nofree(evlist);
 590        zfree(&evlist->mmap);
 591        zfree(&evlist->overwrite_mmap);
 592}
 593
 594static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 595                                       bool overwrite)
 596{
 597        int i;
 598        struct mmap *map;
 599
 600        evlist->core.nr_mmaps = perf_cpu_map__nr(evlist->core.cpus);
 601        if (perf_cpu_map__empty(evlist->core.cpus))
 602                evlist->core.nr_mmaps = perf_thread_map__nr(evlist->core.threads);
 603        map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
 604        if (!map)
 605                return NULL;
 606
 607        for (i = 0; i < evlist->core.nr_mmaps; i++) {
 608                map[i].core.fd = -1;
 609                map[i].core.overwrite = overwrite;
 610                /*
 611                 * When the perf_mmap() call is made we grab one refcount, plus
 612                 * one extra to let perf_mmap__consume() get the last
 613                 * events after all real references (perf_mmap__get()) are
 614                 * dropped.
 615                 *
 616                 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 617                 * thus does perf_mmap__get() on it.
 618                 */
 619                refcount_set(&map[i].core.refcnt, 0);
 620        }
 621        return map;
 622}
 623
 624static bool
 625perf_evlist__should_poll(struct evlist *evlist __maybe_unused,
 626                         struct evsel *evsel)
 627{
 628        if (evsel->core.attr.write_backward)
 629                return false;
 630        return true;
 631}
 632
 633static int evlist__mmap_per_evsel(struct evlist *evlist, int idx,
 634                                       struct mmap_params *mp, int cpu_idx,
 635                                       int thread, int *_output, int *_output_overwrite)
 636{
 637        struct evsel *evsel;
 638        int revent;
 639        int evlist_cpu = cpu_map__cpu(evlist->core.cpus, cpu_idx);
 640
 641        evlist__for_each_entry(evlist, evsel) {
 642                struct mmap *maps = evlist->mmap;
 643                int *output = _output;
 644                int fd;
 645                int cpu;
 646
 647                mp->prot = PROT_READ | PROT_WRITE;
 648                if (evsel->core.attr.write_backward) {
 649                        output = _output_overwrite;
 650                        maps = evlist->overwrite_mmap;
 651
 652                        if (!maps) {
 653                                maps = evlist__alloc_mmap(evlist, true);
 654                                if (!maps)
 655                                        return -1;
 656                                evlist->overwrite_mmap = maps;
 657                                if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
 658                                        perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 659                        }
 660                        mp->prot &= ~PROT_WRITE;
 661                }
 662
 663                if (evsel->core.system_wide && thread)
 664                        continue;
 665
 666                cpu = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
 667                if (cpu == -1)
 668                        continue;
 669
 670                fd = FD(evsel, cpu, thread);
 671
 672                if (*output == -1) {
 673                        *output = fd;
 674
 675                        if (perf_mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
 676                                return -1;
 677                } else {
 678                        if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
 679                                return -1;
 680
 681                        perf_mmap__get(&maps[idx]);
 682                }
 683
 684                revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
 685
 686                /*
 687                 * The system_wide flag causes a selected event to be opened
 688                 * always without a pid.  Consequently it will never get a
 689                 * POLLHUP, but it is used for tracking in combination with
 690                 * other events, so it should not need to be polled anyway.
 691                 * Therefore don't add it for polling.
 692                 */
 693                if (!evsel->core.system_wide &&
 694                     perf_evlist__add_pollfd(&evlist->core, fd, &maps[idx], revent) < 0) {
 695                        perf_mmap__put(&maps[idx]);
 696                        return -1;
 697                }
 698
 699                if (evsel->core.attr.read_format & PERF_FORMAT_ID) {
 700                        if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, cpu, thread,
 701                                                   fd) < 0)
 702                                return -1;
 703                        perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
 704                                                 thread);
 705                }
 706        }
 707
 708        return 0;
 709}
 710
 711static int evlist__mmap_per_cpu(struct evlist *evlist,
 712                                     struct mmap_params *mp)
 713{
 714        int cpu, thread;
 715        int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
 716        int nr_threads = perf_thread_map__nr(evlist->core.threads);
 717
 718        pr_debug2("perf event ring buffer mmapped per cpu\n");
 719        for (cpu = 0; cpu < nr_cpus; cpu++) {
 720                int output = -1;
 721                int output_overwrite = -1;
 722
 723                auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
 724                                              true);
 725
 726                for (thread = 0; thread < nr_threads; thread++) {
 727                        if (evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
 728                                                        thread, &output, &output_overwrite))
 729                                goto out_unmap;
 730                }
 731        }
 732
 733        return 0;
 734
 735out_unmap:
 736        evlist__munmap_nofree(evlist);
 737        return -1;
 738}
 739
 740static int evlist__mmap_per_thread(struct evlist *evlist,
 741                                        struct mmap_params *mp)
 742{
 743        int thread;
 744        int nr_threads = perf_thread_map__nr(evlist->core.threads);
 745
 746        pr_debug2("perf event ring buffer mmapped per thread\n");
 747        for (thread = 0; thread < nr_threads; thread++) {
 748                int output = -1;
 749                int output_overwrite = -1;
 750
 751                auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
 752                                              false);
 753
 754                if (evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
 755                                                &output, &output_overwrite))
 756                        goto out_unmap;
 757        }
 758
 759        return 0;
 760
 761out_unmap:
 762        evlist__munmap_nofree(evlist);
 763        return -1;
 764}
 765
 766unsigned long perf_event_mlock_kb_in_pages(void)
 767{
 768        unsigned long pages;
 769        int max;
 770
 771        if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
 772                /*
 773                 * Pick a once upon a time good value, i.e. things look
 774                 * strange since we can't read a sysctl value, but lets not
 775                 * die yet...
 776                 */
 777                max = 512;
 778        } else {
 779                max -= (page_size / 1024);
 780        }
 781
 782        pages = (max * 1024) / page_size;
 783        if (!is_power_of_2(pages))
 784                pages = rounddown_pow_of_two(pages);
 785
 786        return pages;
 787}
 788
 789size_t evlist__mmap_size(unsigned long pages)
 790{
 791        if (pages == UINT_MAX)
 792                pages = perf_event_mlock_kb_in_pages();
 793        else if (!is_power_of_2(pages))
 794                return 0;
 795
 796        return (pages + 1) * page_size;
 797}
 798
 799static long parse_pages_arg(const char *str, unsigned long min,
 800                            unsigned long max)
 801{
 802        unsigned long pages, val;
 803        static struct parse_tag tags[] = {
 804                { .tag  = 'B', .mult = 1       },
 805                { .tag  = 'K', .mult = 1 << 10 },
 806                { .tag  = 'M', .mult = 1 << 20 },
 807                { .tag  = 'G', .mult = 1 << 30 },
 808                { .tag  = 0 },
 809        };
 810
 811        if (str == NULL)
 812                return -EINVAL;
 813
 814        val = parse_tag_value(str, tags);
 815        if (val != (unsigned long) -1) {
 816                /* we got file size value */
 817                pages = PERF_ALIGN(val, page_size) / page_size;
 818        } else {
 819                /* we got pages count value */
 820                char *eptr;
 821                pages = strtoul(str, &eptr, 10);
 822                if (*eptr != '\0')
 823                        return -EINVAL;
 824        }
 825
 826        if (pages == 0 && min == 0) {
 827                /* leave number of pages at 0 */
 828        } else if (!is_power_of_2(pages)) {
 829                char buf[100];
 830
 831                /* round pages up to next power of 2 */
 832                pages = roundup_pow_of_two(pages);
 833                if (!pages)
 834                        return -EINVAL;
 835
 836                unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
 837                pr_info("rounding mmap pages size to %s (%lu pages)\n",
 838                        buf, pages);
 839        }
 840
 841        if (pages > max)
 842                return -EINVAL;
 843
 844        return pages;
 845}
 846
 847int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
 848{
 849        unsigned long max = UINT_MAX;
 850        long pages;
 851
 852        if (max > SIZE_MAX / page_size)
 853                max = SIZE_MAX / page_size;
 854
 855        pages = parse_pages_arg(str, 1, max);
 856        if (pages < 0) {
 857                pr_err("Invalid argument for --mmap_pages/-m\n");
 858                return -1;
 859        }
 860
 861        *mmap_pages = pages;
 862        return 0;
 863}
 864
 865int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
 866                                  int unset __maybe_unused)
 867{
 868        return __perf_evlist__parse_mmap_pages(opt->value, str);
 869}
 870
 871/**
 872 * evlist__mmap_ex - Create mmaps to receive events.
 873 * @evlist: list of events
 874 * @pages: map length in pages
 875 * @overwrite: overwrite older events?
 876 * @auxtrace_pages - auxtrace map length in pages
 877 * @auxtrace_overwrite - overwrite older auxtrace data?
 878 *
 879 * If @overwrite is %false the user needs to signal event consumption using
 880 * perf_mmap__write_tail().  Using evlist__mmap_read() does this
 881 * automatically.
 882 *
 883 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
 884 * consumption using auxtrace_mmap__write_tail().
 885 *
 886 * Return: %0 on success, negative error code otherwise.
 887 */
 888int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
 889                         unsigned int auxtrace_pages,
 890                         bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
 891                         int comp_level)
 892{
 893        struct evsel *evsel;
 894        const struct perf_cpu_map *cpus = evlist->core.cpus;
 895        const struct perf_thread_map *threads = evlist->core.threads;
 896        /*
 897         * Delay setting mp.prot: set it before calling perf_mmap__mmap.
 898         * Its value is decided by evsel's write_backward.
 899         * So &mp should not be passed through const pointer.
 900         */
 901        struct mmap_params mp = { .nr_cblocks = nr_cblocks, .affinity = affinity, .flush = flush,
 902                                  .comp_level = comp_level };
 903
 904        if (!evlist->mmap)
 905                evlist->mmap = evlist__alloc_mmap(evlist, false);
 906        if (!evlist->mmap)
 907                return -ENOMEM;
 908
 909        if (evlist->core.pollfd.entries == NULL && perf_evlist__alloc_pollfd(&evlist->core) < 0)
 910                return -ENOMEM;
 911
 912        evlist->core.mmap_len = evlist__mmap_size(pages);
 913        pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
 914        mp.mask = evlist->core.mmap_len - page_size - 1;
 915
 916        auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
 917                                   auxtrace_pages, auxtrace_overwrite);
 918
 919        evlist__for_each_entry(evlist, evsel) {
 920                if ((evsel->core.attr.read_format & PERF_FORMAT_ID) &&
 921                    evsel->core.sample_id == NULL &&
 922                    perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr) < 0)
 923                        return -ENOMEM;
 924        }
 925
 926        if (perf_cpu_map__empty(cpus))
 927                return evlist__mmap_per_thread(evlist, &mp);
 928
 929        return evlist__mmap_per_cpu(evlist, &mp);
 930}
 931
 932int evlist__mmap(struct evlist *evlist, unsigned int pages)
 933{
 934        return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
 935}
 936
 937int perf_evlist__create_maps(struct evlist *evlist, struct target *target)
 938{
 939        bool all_threads = (target->per_thread && target->system_wide);
 940        struct perf_cpu_map *cpus;
 941        struct perf_thread_map *threads;
 942
 943        /*
 944         * If specify '-a' and '--per-thread' to perf record, perf record
 945         * will override '--per-thread'. target->per_thread = false and
 946         * target->system_wide = true.
 947         *
 948         * If specify '--per-thread' only to perf record,
 949         * target->per_thread = true and target->system_wide = false.
 950         *
 951         * So target->per_thread && target->system_wide is false.
 952         * For perf record, thread_map__new_str doesn't call
 953         * thread_map__new_all_cpus. That will keep perf record's
 954         * current behavior.
 955         *
 956         * For perf stat, it allows the case that target->per_thread and
 957         * target->system_wide are all true. It means to collect system-wide
 958         * per-thread data. thread_map__new_str will call
 959         * thread_map__new_all_cpus to enumerate all threads.
 960         */
 961        threads = thread_map__new_str(target->pid, target->tid, target->uid,
 962                                      all_threads);
 963
 964        if (!threads)
 965                return -1;
 966
 967        if (target__uses_dummy_map(target))
 968                cpus = perf_cpu_map__dummy_new();
 969        else
 970                cpus = perf_cpu_map__new(target->cpu_list);
 971
 972        if (!cpus)
 973                goto out_delete_threads;
 974
 975        evlist->core.has_user_cpus = !!target->cpu_list;
 976
 977        perf_evlist__set_maps(&evlist->core, cpus, threads);
 978
 979        return 0;
 980
 981out_delete_threads:
 982        perf_thread_map__put(threads);
 983        return -1;
 984}
 985
 986void __perf_evlist__set_sample_bit(struct evlist *evlist,
 987                                   enum perf_event_sample_format bit)
 988{
 989        struct evsel *evsel;
 990
 991        evlist__for_each_entry(evlist, evsel)
 992                __perf_evsel__set_sample_bit(evsel, bit);
 993}
 994
 995void __perf_evlist__reset_sample_bit(struct evlist *evlist,
 996                                     enum perf_event_sample_format bit)
 997{
 998        struct evsel *evsel;
 999
1000        evlist__for_each_entry(evlist, evsel)
1001                __perf_evsel__reset_sample_bit(evsel, bit);
1002}
1003
1004int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
1005{
1006        struct evsel *evsel;
1007        int err = 0;
1008
1009        evlist__for_each_entry(evlist, evsel) {
1010                if (evsel->filter == NULL)
1011                        continue;
1012
1013                /*
1014                 * filters only work for tracepoint event, which doesn't have cpu limit.
1015                 * So evlist and evsel should always be same.
1016                 */
1017                err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
1018                if (err) {
1019                        *err_evsel = evsel;
1020                        break;
1021                }
1022        }
1023
1024        return err;
1025}
1026
1027int perf_evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1028{
1029        struct evsel *evsel;
1030        int err = 0;
1031
1032        evlist__for_each_entry(evlist, evsel) {
1033                if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1034                        continue;
1035
1036                err = perf_evsel__set_filter(evsel, filter);
1037                if (err)
1038                        break;
1039        }
1040
1041        return err;
1042}
1043
1044int perf_evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1045{
1046        char *filter;
1047        int ret = -1;
1048        size_t i;
1049
1050        for (i = 0; i < npids; ++i) {
1051                if (i == 0) {
1052                        if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1053                                return -1;
1054                } else {
1055                        char *tmp;
1056
1057                        if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1058                                goto out_free;
1059
1060                        free(filter);
1061                        filter = tmp;
1062                }
1063        }
1064
1065        ret = perf_evlist__set_tp_filter(evlist, filter);
1066out_free:
1067        free(filter);
1068        return ret;
1069}
1070
1071int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
1072{
1073        return perf_evlist__set_tp_filter_pids(evlist, 1, &pid);
1074}
1075
1076bool perf_evlist__valid_sample_type(struct evlist *evlist)
1077{
1078        struct evsel *pos;
1079
1080        if (evlist->core.nr_entries == 1)
1081                return true;
1082
1083        if (evlist->id_pos < 0 || evlist->is_pos < 0)
1084                return false;
1085
1086        evlist__for_each_entry(evlist, pos) {
1087                if (pos->id_pos != evlist->id_pos ||
1088                    pos->is_pos != evlist->is_pos)
1089                        return false;
1090        }
1091
1092        return true;
1093}
1094
1095u64 __perf_evlist__combined_sample_type(struct evlist *evlist)
1096{
1097        struct evsel *evsel;
1098
1099        if (evlist->combined_sample_type)
1100                return evlist->combined_sample_type;
1101
1102        evlist__for_each_entry(evlist, evsel)
1103                evlist->combined_sample_type |= evsel->core.attr.sample_type;
1104
1105        return evlist->combined_sample_type;
1106}
1107
1108u64 perf_evlist__combined_sample_type(struct evlist *evlist)
1109{
1110        evlist->combined_sample_type = 0;
1111        return __perf_evlist__combined_sample_type(evlist);
1112}
1113
1114u64 perf_evlist__combined_branch_type(struct evlist *evlist)
1115{
1116        struct evsel *evsel;
1117        u64 branch_type = 0;
1118
1119        evlist__for_each_entry(evlist, evsel)
1120                branch_type |= evsel->core.attr.branch_sample_type;
1121        return branch_type;
1122}
1123
1124bool perf_evlist__valid_read_format(struct evlist *evlist)
1125{
1126        struct evsel *first = evlist__first(evlist), *pos = first;
1127        u64 read_format = first->core.attr.read_format;
1128        u64 sample_type = first->core.attr.sample_type;
1129
1130        evlist__for_each_entry(evlist, pos) {
1131                if (read_format != pos->core.attr.read_format)
1132                        return false;
1133        }
1134
1135        /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1136        if ((sample_type & PERF_SAMPLE_READ) &&
1137            !(read_format & PERF_FORMAT_ID)) {
1138                return false;
1139        }
1140
1141        return true;
1142}
1143
1144u16 perf_evlist__id_hdr_size(struct evlist *evlist)
1145{
1146        struct evsel *first = evlist__first(evlist);
1147        struct perf_sample *data;
1148        u64 sample_type;
1149        u16 size = 0;
1150
1151        if (!first->core.attr.sample_id_all)
1152                goto out;
1153
1154        sample_type = first->core.attr.sample_type;
1155
1156        if (sample_type & PERF_SAMPLE_TID)
1157                size += sizeof(data->tid) * 2;
1158
1159       if (sample_type & PERF_SAMPLE_TIME)
1160                size += sizeof(data->time);
1161
1162        if (sample_type & PERF_SAMPLE_ID)
1163                size += sizeof(data->id);
1164
1165        if (sample_type & PERF_SAMPLE_STREAM_ID)
1166                size += sizeof(data->stream_id);
1167
1168        if (sample_type & PERF_SAMPLE_CPU)
1169                size += sizeof(data->cpu) * 2;
1170
1171        if (sample_type & PERF_SAMPLE_IDENTIFIER)
1172                size += sizeof(data->id);
1173out:
1174        return size;
1175}
1176
1177bool perf_evlist__valid_sample_id_all(struct evlist *evlist)
1178{
1179        struct evsel *first = evlist__first(evlist), *pos = first;
1180
1181        evlist__for_each_entry_continue(evlist, pos) {
1182                if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1183                        return false;
1184        }
1185
1186        return true;
1187}
1188
1189bool perf_evlist__sample_id_all(struct evlist *evlist)
1190{
1191        struct evsel *first = evlist__first(evlist);
1192        return first->core.attr.sample_id_all;
1193}
1194
1195void perf_evlist__set_selected(struct evlist *evlist,
1196                               struct evsel *evsel)
1197{
1198        evlist->selected = evsel;
1199}
1200
1201void evlist__close(struct evlist *evlist)
1202{
1203        struct evsel *evsel;
1204
1205        evlist__for_each_entry_reverse(evlist, evsel)
1206                evsel__close(evsel);
1207}
1208
1209static int perf_evlist__create_syswide_maps(struct evlist *evlist)
1210{
1211        struct perf_cpu_map *cpus;
1212        struct perf_thread_map *threads;
1213        int err = -ENOMEM;
1214
1215        /*
1216         * Try reading /sys/devices/system/cpu/online to get
1217         * an all cpus map.
1218         *
1219         * FIXME: -ENOMEM is the best we can do here, the cpu_map
1220         * code needs an overhaul to properly forward the
1221         * error, and we may not want to do that fallback to a
1222         * default cpu identity map :-\
1223         */
1224        cpus = perf_cpu_map__new(NULL);
1225        if (!cpus)
1226                goto out;
1227
1228        threads = perf_thread_map__new_dummy();
1229        if (!threads)
1230                goto out_put;
1231
1232        perf_evlist__set_maps(&evlist->core, cpus, threads);
1233out:
1234        return err;
1235out_put:
1236        perf_cpu_map__put(cpus);
1237        goto out;
1238}
1239
1240int evlist__open(struct evlist *evlist)
1241{
1242        struct evsel *evsel;
1243        int err;
1244
1245        /*
1246         * Default: one fd per CPU, all threads, aka systemwide
1247         * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1248         */
1249        if (evlist->core.threads == NULL && evlist->core.cpus == NULL) {
1250                err = perf_evlist__create_syswide_maps(evlist);
1251                if (err < 0)
1252                        goto out_err;
1253        }
1254
1255        perf_evlist__update_id_pos(evlist);
1256
1257        evlist__for_each_entry(evlist, evsel) {
1258                err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1259                if (err < 0)
1260                        goto out_err;
1261        }
1262
1263        return 0;
1264out_err:
1265        evlist__close(evlist);
1266        errno = -err;
1267        return err;
1268}
1269
1270int perf_evlist__prepare_workload(struct evlist *evlist, struct target *target,
1271                                  const char *argv[], bool pipe_output,
1272                                  void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1273{
1274        int child_ready_pipe[2], go_pipe[2];
1275        char bf;
1276
1277        if (pipe(child_ready_pipe) < 0) {
1278                perror("failed to create 'ready' pipe");
1279                return -1;
1280        }
1281
1282        if (pipe(go_pipe) < 0) {
1283                perror("failed to create 'go' pipe");
1284                goto out_close_ready_pipe;
1285        }
1286
1287        evlist->workload.pid = fork();
1288        if (evlist->workload.pid < 0) {
1289                perror("failed to fork");
1290                goto out_close_pipes;
1291        }
1292
1293        if (!evlist->workload.pid) {
1294                int ret;
1295
1296                if (pipe_output)
1297                        dup2(2, 1);
1298
1299                signal(SIGTERM, SIG_DFL);
1300
1301                close(child_ready_pipe[0]);
1302                close(go_pipe[1]);
1303                fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1304
1305                /*
1306                 * Tell the parent we're ready to go
1307                 */
1308                close(child_ready_pipe[1]);
1309
1310                /*
1311                 * Wait until the parent tells us to go.
1312                 */
1313                ret = read(go_pipe[0], &bf, 1);
1314                /*
1315                 * The parent will ask for the execvp() to be performed by
1316                 * writing exactly one byte, in workload.cork_fd, usually via
1317                 * perf_evlist__start_workload().
1318                 *
1319                 * For cancelling the workload without actually running it,
1320                 * the parent will just close workload.cork_fd, without writing
1321                 * anything, i.e. read will return zero and we just exit()
1322                 * here.
1323                 */
1324                if (ret != 1) {
1325                        if (ret == -1)
1326                                perror("unable to read pipe");
1327                        exit(ret);
1328                }
1329
1330                execvp(argv[0], (char **)argv);
1331
1332                if (exec_error) {
1333                        union sigval val;
1334
1335                        val.sival_int = errno;
1336                        if (sigqueue(getppid(), SIGUSR1, val))
1337                                perror(argv[0]);
1338                } else
1339                        perror(argv[0]);
1340                exit(-1);
1341        }
1342
1343        if (exec_error) {
1344                struct sigaction act = {
1345                        .sa_flags     = SA_SIGINFO,
1346                        .sa_sigaction = exec_error,
1347                };
1348                sigaction(SIGUSR1, &act, NULL);
1349        }
1350
1351        if (target__none(target)) {
1352                if (evlist->core.threads == NULL) {
1353                        fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1354                                __func__, __LINE__);
1355                        goto out_close_pipes;
1356                }
1357                perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1358        }
1359
1360        close(child_ready_pipe[1]);
1361        close(go_pipe[0]);
1362        /*
1363         * wait for child to settle
1364         */
1365        if (read(child_ready_pipe[0], &bf, 1) == -1) {
1366                perror("unable to read pipe");
1367                goto out_close_pipes;
1368        }
1369
1370        fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1371        evlist->workload.cork_fd = go_pipe[1];
1372        close(child_ready_pipe[0]);
1373        return 0;
1374
1375out_close_pipes:
1376        close(go_pipe[0]);
1377        close(go_pipe[1]);
1378out_close_ready_pipe:
1379        close(child_ready_pipe[0]);
1380        close(child_ready_pipe[1]);
1381        return -1;
1382}
1383
1384int perf_evlist__start_workload(struct evlist *evlist)
1385{
1386        if (evlist->workload.cork_fd > 0) {
1387                char bf = 0;
1388                int ret;
1389                /*
1390                 * Remove the cork, let it rip!
1391                 */
1392                ret = write(evlist->workload.cork_fd, &bf, 1);
1393                if (ret < 0)
1394                        perror("unable to write to pipe");
1395
1396                close(evlist->workload.cork_fd);
1397                return ret;
1398        }
1399
1400        return 0;
1401}
1402
1403int perf_evlist__parse_sample(struct evlist *evlist, union perf_event *event,
1404                              struct perf_sample *sample)
1405{
1406        struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1407
1408        if (!evsel)
1409                return -EFAULT;
1410        return perf_evsel__parse_sample(evsel, event, sample);
1411}
1412
1413int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
1414                                        union perf_event *event,
1415                                        u64 *timestamp)
1416{
1417        struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1418
1419        if (!evsel)
1420                return -EFAULT;
1421        return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1422}
1423
1424int perf_evlist__strerror_open(struct evlist *evlist,
1425                               int err, char *buf, size_t size)
1426{
1427        int printed, value;
1428        char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1429
1430        switch (err) {
1431        case EACCES:
1432        case EPERM:
1433                printed = scnprintf(buf, size,
1434                                    "Error:\t%s.\n"
1435                                    "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1436
1437                value = perf_event_paranoid();
1438
1439                printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1440
1441                if (value >= 2) {
1442                        printed += scnprintf(buf + printed, size - printed,
1443                                             "For your workloads it needs to be <= 1\nHint:\t");
1444                }
1445                printed += scnprintf(buf + printed, size - printed,
1446                                     "For system wide tracing it needs to be set to -1.\n");
1447
1448                printed += scnprintf(buf + printed, size - printed,
1449                                    "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1450                                    "Hint:\tThe current value is %d.", value);
1451                break;
1452        case EINVAL: {
1453                struct evsel *first = evlist__first(evlist);
1454                int max_freq;
1455
1456                if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1457                        goto out_default;
1458
1459                if (first->core.attr.sample_freq < (u64)max_freq)
1460                        goto out_default;
1461
1462                printed = scnprintf(buf, size,
1463                                    "Error:\t%s.\n"
1464                                    "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1465                                    "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1466                                    emsg, max_freq, first->core.attr.sample_freq);
1467                break;
1468        }
1469        default:
1470out_default:
1471                scnprintf(buf, size, "%s", emsg);
1472                break;
1473        }
1474
1475        return 0;
1476}
1477
1478int perf_evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1479{
1480        char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1481        int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1482
1483        switch (err) {
1484        case EPERM:
1485                sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1486                printed += scnprintf(buf + printed, size - printed,
1487                                     "Error:\t%s.\n"
1488                                     "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1489                                     "Hint:\tTried using %zd kB.\n",
1490                                     emsg, pages_max_per_user, pages_attempted);
1491
1492                if (pages_attempted >= pages_max_per_user) {
1493                        printed += scnprintf(buf + printed, size - printed,
1494                                             "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1495                                             pages_max_per_user + pages_attempted);
1496                }
1497
1498                printed += scnprintf(buf + printed, size - printed,
1499                                     "Hint:\tTry using a smaller -m/--mmap-pages value.");
1500                break;
1501        default:
1502                scnprintf(buf, size, "%s", emsg);
1503                break;
1504        }
1505
1506        return 0;
1507}
1508
1509void perf_evlist__to_front(struct evlist *evlist,
1510                           struct evsel *move_evsel)
1511{
1512        struct evsel *evsel, *n;
1513        LIST_HEAD(move);
1514
1515        if (move_evsel == evlist__first(evlist))
1516                return;
1517
1518        evlist__for_each_entry_safe(evlist, n, evsel) {
1519                if (evsel->leader == move_evsel->leader)
1520                        list_move_tail(&evsel->core.node, &move);
1521        }
1522
1523        list_splice(&move, &evlist->core.entries);
1524}
1525
1526void perf_evlist__set_tracking_event(struct evlist *evlist,
1527                                     struct evsel *tracking_evsel)
1528{
1529        struct evsel *evsel;
1530
1531        if (tracking_evsel->tracking)
1532                return;
1533
1534        evlist__for_each_entry(evlist, evsel) {
1535                if (evsel != tracking_evsel)
1536                        evsel->tracking = false;
1537        }
1538
1539        tracking_evsel->tracking = true;
1540}
1541
1542struct evsel *
1543perf_evlist__find_evsel_by_str(struct evlist *evlist,
1544                               const char *str)
1545{
1546        struct evsel *evsel;
1547
1548        evlist__for_each_entry(evlist, evsel) {
1549                if (!evsel->name)
1550                        continue;
1551                if (strcmp(str, evsel->name) == 0)
1552                        return evsel;
1553        }
1554
1555        return NULL;
1556}
1557
1558void perf_evlist__toggle_bkw_mmap(struct evlist *evlist,
1559                                  enum bkw_mmap_state state)
1560{
1561        enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1562        enum action {
1563                NONE,
1564                PAUSE,
1565                RESUME,
1566        } action = NONE;
1567
1568        if (!evlist->overwrite_mmap)
1569                return;
1570
1571        switch (old_state) {
1572        case BKW_MMAP_NOTREADY: {
1573                if (state != BKW_MMAP_RUNNING)
1574                        goto state_err;
1575                break;
1576        }
1577        case BKW_MMAP_RUNNING: {
1578                if (state != BKW_MMAP_DATA_PENDING)
1579                        goto state_err;
1580                action = PAUSE;
1581                break;
1582        }
1583        case BKW_MMAP_DATA_PENDING: {
1584                if (state != BKW_MMAP_EMPTY)
1585                        goto state_err;
1586                break;
1587        }
1588        case BKW_MMAP_EMPTY: {
1589                if (state != BKW_MMAP_RUNNING)
1590                        goto state_err;
1591                action = RESUME;
1592                break;
1593        }
1594        default:
1595                WARN_ONCE(1, "Shouldn't get there\n");
1596        }
1597
1598        evlist->bkw_mmap_state = state;
1599
1600        switch (action) {
1601        case PAUSE:
1602                perf_evlist__pause(evlist);
1603                break;
1604        case RESUME:
1605                perf_evlist__resume(evlist);
1606                break;
1607        case NONE:
1608        default:
1609                break;
1610        }
1611
1612state_err:
1613        return;
1614}
1615
1616bool perf_evlist__exclude_kernel(struct evlist *evlist)
1617{
1618        struct evsel *evsel;
1619
1620        evlist__for_each_entry(evlist, evsel) {
1621                if (!evsel->core.attr.exclude_kernel)
1622                        return false;
1623        }
1624
1625        return true;
1626}
1627
1628/*
1629 * Events in data file are not collect in groups, but we still want
1630 * the group display. Set the artificial group and set the leader's
1631 * forced_leader flag to notify the display code.
1632 */
1633void perf_evlist__force_leader(struct evlist *evlist)
1634{
1635        if (!evlist->nr_groups) {
1636                struct evsel *leader = evlist__first(evlist);
1637
1638                perf_evlist__set_leader(evlist);
1639                leader->forced_leader = true;
1640        }
1641}
1642
1643struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list,
1644                                                 struct evsel *evsel)
1645{
1646        struct evsel *c2, *leader;
1647        bool is_open = true;
1648
1649        leader = evsel->leader;
1650        pr_debug("Weak group for %s/%d failed\n",
1651                        leader->name, leader->core.nr_members);
1652
1653        /*
1654         * for_each_group_member doesn't work here because it doesn't
1655         * include the first entry.
1656         */
1657        evlist__for_each_entry(evsel_list, c2) {
1658                if (c2 == evsel)
1659                        is_open = false;
1660                if (c2->leader == leader) {
1661                        if (is_open)
1662                                perf_evsel__close(&c2->core);
1663                        c2->leader = c2;
1664                        c2->core.nr_members = 0;
1665                }
1666        }
1667        return leader;
1668}
1669
1670int perf_evlist__add_sb_event(struct evlist **evlist,
1671                              struct perf_event_attr *attr,
1672                              perf_evsel__sb_cb_t cb,
1673                              void *data)
1674{
1675        struct evsel *evsel;
1676        bool new_evlist = (*evlist) == NULL;
1677
1678        if (*evlist == NULL)
1679                *evlist = evlist__new();
1680        if (*evlist == NULL)
1681                return -1;
1682
1683        if (!attr->sample_id_all) {
1684                pr_warning("enabling sample_id_all for all side band events\n");
1685                attr->sample_id_all = 1;
1686        }
1687
1688        evsel = perf_evsel__new_idx(attr, (*evlist)->core.nr_entries);
1689        if (!evsel)
1690                goto out_err;
1691
1692        evsel->side_band.cb = cb;
1693        evsel->side_band.data = data;
1694        evlist__add(*evlist, evsel);
1695        return 0;
1696
1697out_err:
1698        if (new_evlist) {
1699                evlist__delete(*evlist);
1700                *evlist = NULL;
1701        }
1702        return -1;
1703}
1704
1705static void *perf_evlist__poll_thread(void *arg)
1706{
1707        struct evlist *evlist = arg;
1708        bool draining = false;
1709        int i, done = 0;
1710        /*
1711         * In order to read symbols from other namespaces perf to needs to call
1712         * setns(2).  This isn't permitted if the struct_fs has multiple users.
1713         * unshare(2) the fs so that we may continue to setns into namespaces
1714         * that we're observing when, for instance, reading the build-ids at
1715         * the end of a 'perf record' session.
1716         */
1717        unshare(CLONE_FS);
1718
1719        while (!done) {
1720                bool got_data = false;
1721
1722                if (evlist->thread.done)
1723                        draining = true;
1724
1725                if (!draining)
1726                        evlist__poll(evlist, 1000);
1727
1728                for (i = 0; i < evlist->core.nr_mmaps; i++) {
1729                        struct mmap *map = &evlist->mmap[i];
1730                        union perf_event *event;
1731
1732                        if (perf_mmap__read_init(map))
1733                                continue;
1734                        while ((event = perf_mmap__read_event(map)) != NULL) {
1735                                struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1736
1737                                if (evsel && evsel->side_band.cb)
1738                                        evsel->side_band.cb(event, evsel->side_band.data);
1739                                else
1740                                        pr_warning("cannot locate proper evsel for the side band event\n");
1741
1742                                perf_mmap__consume(map);
1743                                got_data = true;
1744                        }
1745                        perf_mmap__read_done(map);
1746                }
1747
1748                if (draining && !got_data)
1749                        break;
1750        }
1751        return NULL;
1752}
1753
1754int perf_evlist__start_sb_thread(struct evlist *evlist,
1755                                 struct target *target)
1756{
1757        struct evsel *counter;
1758
1759        if (!evlist)
1760                return 0;
1761
1762        if (perf_evlist__create_maps(evlist, target))
1763                goto out_delete_evlist;
1764
1765        evlist__for_each_entry(evlist, counter) {
1766                if (evsel__open(counter, evlist->core.cpus,
1767                                     evlist->core.threads) < 0)
1768                        goto out_delete_evlist;
1769        }
1770
1771        if (evlist__mmap(evlist, UINT_MAX))
1772                goto out_delete_evlist;
1773
1774        evlist__for_each_entry(evlist, counter) {
1775                if (evsel__enable(counter))
1776                        goto out_delete_evlist;
1777        }
1778
1779        evlist->thread.done = 0;
1780        if (pthread_create(&evlist->thread.th, NULL, perf_evlist__poll_thread, evlist))
1781                goto out_delete_evlist;
1782
1783        return 0;
1784
1785out_delete_evlist:
1786        evlist__delete(evlist);
1787        evlist = NULL;
1788        return -1;
1789}
1790
1791void perf_evlist__stop_sb_thread(struct evlist *evlist)
1792{
1793        if (!evlist)
1794                return;
1795        evlist->thread.done = 1;
1796        pthread_join(evlist->thread.th, NULL);
1797        evlist__delete(evlist);
1798}
1799