linux/tools/perf/util/evlist.c
<<
>>
Prefs
   1/*
   2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   3 *
   4 * Parts came from builtin-{top,stat,record}.c, see those files for further
   5 * copyright notes.
   6 *
   7 * Released under the GPL v2. (and only v2, not any later version)
   8 */
   9#include "util.h"
  10#include <api/fs/fs.h>
  11#include <errno.h>
  12#include <inttypes.h>
  13#include <poll.h>
  14#include "cpumap.h"
  15#include "thread_map.h"
  16#include "target.h"
  17#include "evlist.h"
  18#include "evsel.h"
  19#include "debug.h"
  20#include "units.h"
  21#include "asm/bug.h"
  22#include <signal.h>
  23#include <unistd.h>
  24
  25#include "parse-events.h"
  26#include <subcmd/parse-options.h>
  27
  28#include <fcntl.h>
  29#include <sys/ioctl.h>
  30#include <sys/mman.h>
  31
  32#include <linux/bitops.h>
  33#include <linux/hash.h>
  34#include <linux/log2.h>
  35#include <linux/err.h>
  36
  37#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  38#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
  39
  40void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
  41                       struct thread_map *threads)
  42{
  43        int i;
  44
  45        for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  46                INIT_HLIST_HEAD(&evlist->heads[i]);
  47        INIT_LIST_HEAD(&evlist->entries);
  48        perf_evlist__set_maps(evlist, cpus, threads);
  49        fdarray__init(&evlist->pollfd, 64);
  50        evlist->workload.pid = -1;
  51        evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
  52}
  53
  54struct perf_evlist *perf_evlist__new(void)
  55{
  56        struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  57
  58        if (evlist != NULL)
  59                perf_evlist__init(evlist, NULL, NULL);
  60
  61        return evlist;
  62}
  63
  64struct perf_evlist *perf_evlist__new_default(void)
  65{
  66        struct perf_evlist *evlist = perf_evlist__new();
  67
  68        if (evlist && perf_evlist__add_default(evlist)) {
  69                perf_evlist__delete(evlist);
  70                evlist = NULL;
  71        }
  72
  73        return evlist;
  74}
  75
  76struct perf_evlist *perf_evlist__new_dummy(void)
  77{
  78        struct perf_evlist *evlist = perf_evlist__new();
  79
  80        if (evlist && perf_evlist__add_dummy(evlist)) {
  81                perf_evlist__delete(evlist);
  82                evlist = NULL;
  83        }
  84
  85        return evlist;
  86}
  87
  88/**
  89 * perf_evlist__set_id_pos - set the positions of event ids.
  90 * @evlist: selected event list
  91 *
  92 * Events with compatible sample types all have the same id_pos
  93 * and is_pos.  For convenience, put a copy on evlist.
  94 */
  95void perf_evlist__set_id_pos(struct perf_evlist *evlist)
  96{
  97        struct perf_evsel *first = perf_evlist__first(evlist);
  98
  99        evlist->id_pos = first->id_pos;
 100        evlist->is_pos = first->is_pos;
 101}
 102
 103static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
 104{
 105        struct perf_evsel *evsel;
 106
 107        evlist__for_each_entry(evlist, evsel)
 108                perf_evsel__calc_id_pos(evsel);
 109
 110        perf_evlist__set_id_pos(evlist);
 111}
 112
 113static void perf_evlist__purge(struct perf_evlist *evlist)
 114{
 115        struct perf_evsel *pos, *n;
 116
 117        evlist__for_each_entry_safe(evlist, n, pos) {
 118                list_del_init(&pos->node);
 119                pos->evlist = NULL;
 120                perf_evsel__delete(pos);
 121        }
 122
 123        evlist->nr_entries = 0;
 124}
 125
 126void perf_evlist__exit(struct perf_evlist *evlist)
 127{
 128        zfree(&evlist->mmap);
 129        zfree(&evlist->overwrite_mmap);
 130        fdarray__exit(&evlist->pollfd);
 131}
 132
 133void perf_evlist__delete(struct perf_evlist *evlist)
 134{
 135        if (evlist == NULL)
 136                return;
 137
 138        perf_evlist__munmap(evlist);
 139        perf_evlist__close(evlist);
 140        cpu_map__put(evlist->cpus);
 141        thread_map__put(evlist->threads);
 142        evlist->cpus = NULL;
 143        evlist->threads = NULL;
 144        perf_evlist__purge(evlist);
 145        perf_evlist__exit(evlist);
 146        free(evlist);
 147}
 148
 149static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
 150                                          struct perf_evsel *evsel)
 151{
 152        /*
 153         * We already have cpus for evsel (via PMU sysfs) so
 154         * keep it, if there's no target cpu list defined.
 155         */
 156        if (!evsel->own_cpus || evlist->has_user_cpus) {
 157                cpu_map__put(evsel->cpus);
 158                evsel->cpus = cpu_map__get(evlist->cpus);
 159        } else if (evsel->cpus != evsel->own_cpus) {
 160                cpu_map__put(evsel->cpus);
 161                evsel->cpus = cpu_map__get(evsel->own_cpus);
 162        }
 163
 164        thread_map__put(evsel->threads);
 165        evsel->threads = thread_map__get(evlist->threads);
 166}
 167
 168static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
 169{
 170        struct perf_evsel *evsel;
 171
 172        evlist__for_each_entry(evlist, evsel)
 173                __perf_evlist__propagate_maps(evlist, evsel);
 174}
 175
 176void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
 177{
 178        entry->evlist = evlist;
 179        list_add_tail(&entry->node, &evlist->entries);
 180        entry->idx = evlist->nr_entries;
 181        entry->tracking = !entry->idx;
 182
 183        if (!evlist->nr_entries++)
 184                perf_evlist__set_id_pos(evlist);
 185
 186        __perf_evlist__propagate_maps(evlist, entry);
 187}
 188
 189void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
 190{
 191        evsel->evlist = NULL;
 192        list_del_init(&evsel->node);
 193        evlist->nr_entries -= 1;
 194}
 195
 196void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 197                                   struct list_head *list)
 198{
 199        struct perf_evsel *evsel, *temp;
 200
 201        __evlist__for_each_entry_safe(list, temp, evsel) {
 202                list_del_init(&evsel->node);
 203                perf_evlist__add(evlist, evsel);
 204        }
 205}
 206
 207void __perf_evlist__set_leader(struct list_head *list)
 208{
 209        struct perf_evsel *evsel, *leader;
 210
 211        leader = list_entry(list->next, struct perf_evsel, node);
 212        evsel = list_entry(list->prev, struct perf_evsel, node);
 213
 214        leader->nr_members = evsel->idx - leader->idx + 1;
 215
 216        __evlist__for_each_entry(list, evsel) {
 217                evsel->leader = leader;
 218        }
 219}
 220
 221void perf_evlist__set_leader(struct perf_evlist *evlist)
 222{
 223        if (evlist->nr_entries) {
 224                evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
 225                __perf_evlist__set_leader(&evlist->entries);
 226        }
 227}
 228
 229void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr)
 230{
 231        attr->precise_ip = 3;
 232
 233        while (attr->precise_ip != 0) {
 234                int fd = sys_perf_event_open(attr, 0, -1, -1, 0);
 235                if (fd != -1) {
 236                        close(fd);
 237                        break;
 238                }
 239                --attr->precise_ip;
 240        }
 241}
 242
 243int __perf_evlist__add_default(struct perf_evlist *evlist, bool precise)
 244{
 245        struct perf_evsel *evsel = perf_evsel__new_cycles(precise);
 246
 247        if (evsel == NULL)
 248                return -ENOMEM;
 249
 250        perf_evlist__add(evlist, evsel);
 251        return 0;
 252}
 253
 254int perf_evlist__add_dummy(struct perf_evlist *evlist)
 255{
 256        struct perf_event_attr attr = {
 257                .type   = PERF_TYPE_SOFTWARE,
 258                .config = PERF_COUNT_SW_DUMMY,
 259                .size   = sizeof(attr), /* to capture ABI version */
 260        };
 261        struct perf_evsel *evsel = perf_evsel__new_idx(&attr, evlist->nr_entries);
 262
 263        if (evsel == NULL)
 264                return -ENOMEM;
 265
 266        perf_evlist__add(evlist, evsel);
 267        return 0;
 268}
 269
 270static int perf_evlist__add_attrs(struct perf_evlist *evlist,
 271                                  struct perf_event_attr *attrs, size_t nr_attrs)
 272{
 273        struct perf_evsel *evsel, *n;
 274        LIST_HEAD(head);
 275        size_t i;
 276
 277        for (i = 0; i < nr_attrs; i++) {
 278                evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
 279                if (evsel == NULL)
 280                        goto out_delete_partial_list;
 281                list_add_tail(&evsel->node, &head);
 282        }
 283
 284        perf_evlist__splice_list_tail(evlist, &head);
 285
 286        return 0;
 287
 288out_delete_partial_list:
 289        __evlist__for_each_entry_safe(&head, n, evsel)
 290                perf_evsel__delete(evsel);
 291        return -1;
 292}
 293
 294int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 295                                     struct perf_event_attr *attrs, size_t nr_attrs)
 296{
 297        size_t i;
 298
 299        for (i = 0; i < nr_attrs; i++)
 300                event_attr_init(attrs + i);
 301
 302        return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
 303}
 304
 305struct perf_evsel *
 306perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
 307{
 308        struct perf_evsel *evsel;
 309
 310        evlist__for_each_entry(evlist, evsel) {
 311                if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
 312                    (int)evsel->attr.config == id)
 313                        return evsel;
 314        }
 315
 316        return NULL;
 317}
 318
 319struct perf_evsel *
 320perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
 321                                     const char *name)
 322{
 323        struct perf_evsel *evsel;
 324
 325        evlist__for_each_entry(evlist, evsel) {
 326                if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
 327                    (strcmp(evsel->name, name) == 0))
 328                        return evsel;
 329        }
 330
 331        return NULL;
 332}
 333
 334int perf_evlist__add_newtp(struct perf_evlist *evlist,
 335                           const char *sys, const char *name, void *handler)
 336{
 337        struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
 338
 339        if (IS_ERR(evsel))
 340                return -1;
 341
 342        evsel->handler = handler;
 343        perf_evlist__add(evlist, evsel);
 344        return 0;
 345}
 346
 347static int perf_evlist__nr_threads(struct perf_evlist *evlist,
 348                                   struct perf_evsel *evsel)
 349{
 350        if (evsel->system_wide)
 351                return 1;
 352        else
 353                return thread_map__nr(evlist->threads);
 354}
 355
 356void perf_evlist__disable(struct perf_evlist *evlist)
 357{
 358        struct perf_evsel *pos;
 359
 360        evlist__for_each_entry(evlist, pos) {
 361                if (!perf_evsel__is_group_leader(pos) || !pos->fd)
 362                        continue;
 363                perf_evsel__disable(pos);
 364        }
 365
 366        evlist->enabled = false;
 367}
 368
 369void perf_evlist__enable(struct perf_evlist *evlist)
 370{
 371        struct perf_evsel *pos;
 372
 373        evlist__for_each_entry(evlist, pos) {
 374                if (!perf_evsel__is_group_leader(pos) || !pos->fd)
 375                        continue;
 376                perf_evsel__enable(pos);
 377        }
 378
 379        evlist->enabled = true;
 380}
 381
 382void perf_evlist__toggle_enable(struct perf_evlist *evlist)
 383{
 384        (evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist);
 385}
 386
 387static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
 388                                         struct perf_evsel *evsel, int cpu)
 389{
 390        int thread;
 391        int nr_threads = perf_evlist__nr_threads(evlist, evsel);
 392
 393        if (!evsel->fd)
 394                return -EINVAL;
 395
 396        for (thread = 0; thread < nr_threads; thread++) {
 397                int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 398                if (err)
 399                        return err;
 400        }
 401        return 0;
 402}
 403
 404static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
 405                                            struct perf_evsel *evsel,
 406                                            int thread)
 407{
 408        int cpu;
 409        int nr_cpus = cpu_map__nr(evlist->cpus);
 410
 411        if (!evsel->fd)
 412                return -EINVAL;
 413
 414        for (cpu = 0; cpu < nr_cpus; cpu++) {
 415                int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 416                if (err)
 417                        return err;
 418        }
 419        return 0;
 420}
 421
 422int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
 423                                  struct perf_evsel *evsel, int idx)
 424{
 425        bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
 426
 427        if (per_cpu_mmaps)
 428                return perf_evlist__enable_event_cpu(evlist, evsel, idx);
 429        else
 430                return perf_evlist__enable_event_thread(evlist, evsel, idx);
 431}
 432
 433int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 434{
 435        int nr_cpus = cpu_map__nr(evlist->cpus);
 436        int nr_threads = thread_map__nr(evlist->threads);
 437        int nfds = 0;
 438        struct perf_evsel *evsel;
 439
 440        evlist__for_each_entry(evlist, evsel) {
 441                if (evsel->system_wide)
 442                        nfds += nr_cpus;
 443                else
 444                        nfds += nr_cpus * nr_threads;
 445        }
 446
 447        if (fdarray__available_entries(&evlist->pollfd) < nfds &&
 448            fdarray__grow(&evlist->pollfd, nfds) < 0)
 449                return -ENOMEM;
 450
 451        return 0;
 452}
 453
 454static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
 455                                     struct perf_mmap *map, short revent)
 456{
 457        int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
 458        /*
 459         * Save the idx so that when we filter out fds POLLHUP'ed we can
 460         * close the associated evlist->mmap[] entry.
 461         */
 462        if (pos >= 0) {
 463                evlist->pollfd.priv[pos].ptr = map;
 464
 465                fcntl(fd, F_SETFL, O_NONBLOCK);
 466        }
 467
 468        return pos;
 469}
 470
 471int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
 472{
 473        return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
 474}
 475
 476static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
 477                                         void *arg __maybe_unused)
 478{
 479        struct perf_mmap *map = fda->priv[fd].ptr;
 480
 481        if (map)
 482                perf_mmap__put(map);
 483}
 484
 485int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
 486{
 487        return fdarray__filter(&evlist->pollfd, revents_and_mask,
 488                               perf_evlist__munmap_filtered, NULL);
 489}
 490
 491int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
 492{
 493        return fdarray__poll(&evlist->pollfd, timeout);
 494}
 495
 496static void perf_evlist__id_hash(struct perf_evlist *evlist,
 497                                 struct perf_evsel *evsel,
 498                                 int cpu, int thread, u64 id)
 499{
 500        int hash;
 501        struct perf_sample_id *sid = SID(evsel, cpu, thread);
 502
 503        sid->id = id;
 504        sid->evsel = evsel;
 505        hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 506        hlist_add_head(&sid->node, &evlist->heads[hash]);
 507}
 508
 509void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 510                         int cpu, int thread, u64 id)
 511{
 512        perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
 513        evsel->id[evsel->ids++] = id;
 514}
 515
 516int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 517                           struct perf_evsel *evsel,
 518                           int cpu, int thread, int fd)
 519{
 520        u64 read_data[4] = { 0, };
 521        int id_idx = 1; /* The first entry is the counter value */
 522        u64 id;
 523        int ret;
 524
 525        ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
 526        if (!ret)
 527                goto add;
 528
 529        if (errno != ENOTTY)
 530                return -1;
 531
 532        /* Legacy way to get event id.. All hail to old kernels! */
 533
 534        /*
 535         * This way does not work with group format read, so bail
 536         * out in that case.
 537         */
 538        if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
 539                return -1;
 540
 541        if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
 542            read(fd, &read_data, sizeof(read_data)) == -1)
 543                return -1;
 544
 545        if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 546                ++id_idx;
 547        if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 548                ++id_idx;
 549
 550        id = read_data[id_idx];
 551
 552 add:
 553        perf_evlist__id_add(evlist, evsel, cpu, thread, id);
 554        return 0;
 555}
 556
 557static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
 558                                     struct perf_evsel *evsel, int idx, int cpu,
 559                                     int thread)
 560{
 561        struct perf_sample_id *sid = SID(evsel, cpu, thread);
 562        sid->idx = idx;
 563        if (evlist->cpus && cpu >= 0)
 564                sid->cpu = evlist->cpus->map[cpu];
 565        else
 566                sid->cpu = -1;
 567        if (!evsel->system_wide && evlist->threads && thread >= 0)
 568                sid->tid = thread_map__pid(evlist->threads, thread);
 569        else
 570                sid->tid = -1;
 571}
 572
 573struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
 574{
 575        struct hlist_head *head;
 576        struct perf_sample_id *sid;
 577        int hash;
 578
 579        hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 580        head = &evlist->heads[hash];
 581
 582        hlist_for_each_entry(sid, head, node)
 583                if (sid->id == id)
 584                        return sid;
 585
 586        return NULL;
 587}
 588
 589struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 590{
 591        struct perf_sample_id *sid;
 592
 593        if (evlist->nr_entries == 1 || !id)
 594                return perf_evlist__first(evlist);
 595
 596        sid = perf_evlist__id2sid(evlist, id);
 597        if (sid)
 598                return sid->evsel;
 599
 600        if (!perf_evlist__sample_id_all(evlist))
 601                return perf_evlist__first(evlist);
 602
 603        return NULL;
 604}
 605
 606struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
 607                                                u64 id)
 608{
 609        struct perf_sample_id *sid;
 610
 611        if (!id)
 612                return NULL;
 613
 614        sid = perf_evlist__id2sid(evlist, id);
 615        if (sid)
 616                return sid->evsel;
 617
 618        return NULL;
 619}
 620
 621static int perf_evlist__event2id(struct perf_evlist *evlist,
 622                                 union perf_event *event, u64 *id)
 623{
 624        const u64 *array = event->sample.array;
 625        ssize_t n;
 626
 627        n = (event->header.size - sizeof(event->header)) >> 3;
 628
 629        if (event->header.type == PERF_RECORD_SAMPLE) {
 630                if (evlist->id_pos >= n)
 631                        return -1;
 632                *id = array[evlist->id_pos];
 633        } else {
 634                if (evlist->is_pos > n)
 635                        return -1;
 636                n -= evlist->is_pos;
 637                *id = array[n];
 638        }
 639        return 0;
 640}
 641
 642struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
 643                                            union perf_event *event)
 644{
 645        struct perf_evsel *first = perf_evlist__first(evlist);
 646        struct hlist_head *head;
 647        struct perf_sample_id *sid;
 648        int hash;
 649        u64 id;
 650
 651        if (evlist->nr_entries == 1)
 652                return first;
 653
 654        if (!first->attr.sample_id_all &&
 655            event->header.type != PERF_RECORD_SAMPLE)
 656                return first;
 657
 658        if (perf_evlist__event2id(evlist, event, &id))
 659                return NULL;
 660
 661        /* Synthesized events have an id of zero */
 662        if (!id)
 663                return first;
 664
 665        hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 666        head = &evlist->heads[hash];
 667
 668        hlist_for_each_entry(sid, head, node) {
 669                if (sid->id == id)
 670                        return sid->evsel;
 671        }
 672        return NULL;
 673}
 674
 675static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
 676{
 677        int i;
 678
 679        if (!evlist->overwrite_mmap)
 680                return 0;
 681
 682        for (i = 0; i < evlist->nr_mmaps; i++) {
 683                int fd = evlist->overwrite_mmap[i].fd;
 684                int err;
 685
 686                if (fd < 0)
 687                        continue;
 688                err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
 689                if (err)
 690                        return err;
 691        }
 692        return 0;
 693}
 694
 695static int perf_evlist__pause(struct perf_evlist *evlist)
 696{
 697        return perf_evlist__set_paused(evlist, true);
 698}
 699
 700static int perf_evlist__resume(struct perf_evlist *evlist)
 701{
 702        return perf_evlist__set_paused(evlist, false);
 703}
 704
 705static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
 706{
 707        int i;
 708
 709        if (evlist->mmap)
 710                for (i = 0; i < evlist->nr_mmaps; i++)
 711                        perf_mmap__munmap(&evlist->mmap[i]);
 712
 713        if (evlist->overwrite_mmap)
 714                for (i = 0; i < evlist->nr_mmaps; i++)
 715                        perf_mmap__munmap(&evlist->overwrite_mmap[i]);
 716}
 717
 718void perf_evlist__munmap(struct perf_evlist *evlist)
 719{
 720        perf_evlist__munmap_nofree(evlist);
 721        zfree(&evlist->mmap);
 722        zfree(&evlist->overwrite_mmap);
 723}
 724
 725static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist,
 726                                                 bool overwrite)
 727{
 728        int i;
 729        struct perf_mmap *map;
 730
 731        evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
 732        if (cpu_map__empty(evlist->cpus))
 733                evlist->nr_mmaps = thread_map__nr(evlist->threads);
 734        map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
 735        if (!map)
 736                return NULL;
 737
 738        for (i = 0; i < evlist->nr_mmaps; i++) {
 739                map[i].fd = -1;
 740                map[i].overwrite = overwrite;
 741                /*
 742                 * When the perf_mmap() call is made we grab one refcount, plus
 743                 * one extra to let perf_mmap__consume() get the last
 744                 * events after all real references (perf_mmap__get()) are
 745                 * dropped.
 746                 *
 747                 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 748                 * thus does perf_mmap__get() on it.
 749                 */
 750                refcount_set(&map[i].refcnt, 0);
 751        }
 752        return map;
 753}
 754
 755static bool
 756perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
 757                         struct perf_evsel *evsel)
 758{
 759        if (evsel->attr.write_backward)
 760                return false;
 761        return true;
 762}
 763
 764static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
 765                                       struct mmap_params *mp, int cpu_idx,
 766                                       int thread, int *_output, int *_output_overwrite)
 767{
 768        struct perf_evsel *evsel;
 769        int revent;
 770        int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
 771
 772        evlist__for_each_entry(evlist, evsel) {
 773                struct perf_mmap *maps = evlist->mmap;
 774                int *output = _output;
 775                int fd;
 776                int cpu;
 777
 778                mp->prot = PROT_READ | PROT_WRITE;
 779                if (evsel->attr.write_backward) {
 780                        output = _output_overwrite;
 781                        maps = evlist->overwrite_mmap;
 782
 783                        if (!maps) {
 784                                maps = perf_evlist__alloc_mmap(evlist, true);
 785                                if (!maps)
 786                                        return -1;
 787                                evlist->overwrite_mmap = maps;
 788                                if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
 789                                        perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 790                        }
 791                        mp->prot &= ~PROT_WRITE;
 792                }
 793
 794                if (evsel->system_wide && thread)
 795                        continue;
 796
 797                cpu = cpu_map__idx(evsel->cpus, evlist_cpu);
 798                if (cpu == -1)
 799                        continue;
 800
 801                fd = FD(evsel, cpu, thread);
 802
 803                if (*output == -1) {
 804                        *output = fd;
 805
 806                        if (perf_mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
 807                                return -1;
 808                } else {
 809                        if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
 810                                return -1;
 811
 812                        perf_mmap__get(&maps[idx]);
 813                }
 814
 815                revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
 816
 817                /*
 818                 * The system_wide flag causes a selected event to be opened
 819                 * always without a pid.  Consequently it will never get a
 820                 * POLLHUP, but it is used for tracking in combination with
 821                 * other events, so it should not need to be polled anyway.
 822                 * Therefore don't add it for polling.
 823                 */
 824                if (!evsel->system_wide &&
 825                    __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
 826                        perf_mmap__put(&maps[idx]);
 827                        return -1;
 828                }
 829
 830                if (evsel->attr.read_format & PERF_FORMAT_ID) {
 831                        if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
 832                                                   fd) < 0)
 833                                return -1;
 834                        perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
 835                                                 thread);
 836                }
 837        }
 838
 839        return 0;
 840}
 841
 842static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
 843                                     struct mmap_params *mp)
 844{
 845        int cpu, thread;
 846        int nr_cpus = cpu_map__nr(evlist->cpus);
 847        int nr_threads = thread_map__nr(evlist->threads);
 848
 849        pr_debug2("perf event ring buffer mmapped per cpu\n");
 850        for (cpu = 0; cpu < nr_cpus; cpu++) {
 851                int output = -1;
 852                int output_overwrite = -1;
 853
 854                auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
 855                                              true);
 856
 857                for (thread = 0; thread < nr_threads; thread++) {
 858                        if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
 859                                                        thread, &output, &output_overwrite))
 860                                goto out_unmap;
 861                }
 862        }
 863
 864        return 0;
 865
 866out_unmap:
 867        perf_evlist__munmap_nofree(evlist);
 868        return -1;
 869}
 870
 871static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
 872                                        struct mmap_params *mp)
 873{
 874        int thread;
 875        int nr_threads = thread_map__nr(evlist->threads);
 876
 877        pr_debug2("perf event ring buffer mmapped per thread\n");
 878        for (thread = 0; thread < nr_threads; thread++) {
 879                int output = -1;
 880                int output_overwrite = -1;
 881
 882                auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
 883                                              false);
 884
 885                if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
 886                                                &output, &output_overwrite))
 887                        goto out_unmap;
 888        }
 889
 890        return 0;
 891
 892out_unmap:
 893        perf_evlist__munmap_nofree(evlist);
 894        return -1;
 895}
 896
 897unsigned long perf_event_mlock_kb_in_pages(void)
 898{
 899        unsigned long pages;
 900        int max;
 901
 902        if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
 903                /*
 904                 * Pick a once upon a time good value, i.e. things look
 905                 * strange since we can't read a sysctl value, but lets not
 906                 * die yet...
 907                 */
 908                max = 512;
 909        } else {
 910                max -= (page_size / 1024);
 911        }
 912
 913        pages = (max * 1024) / page_size;
 914        if (!is_power_of_2(pages))
 915                pages = rounddown_pow_of_two(pages);
 916
 917        return pages;
 918}
 919
 920size_t perf_evlist__mmap_size(unsigned long pages)
 921{
 922        if (pages == UINT_MAX)
 923                pages = perf_event_mlock_kb_in_pages();
 924        else if (!is_power_of_2(pages))
 925                return 0;
 926
 927        return (pages + 1) * page_size;
 928}
 929
 930static long parse_pages_arg(const char *str, unsigned long min,
 931                            unsigned long max)
 932{
 933        unsigned long pages, val;
 934        static struct parse_tag tags[] = {
 935                { .tag  = 'B', .mult = 1       },
 936                { .tag  = 'K', .mult = 1 << 10 },
 937                { .tag  = 'M', .mult = 1 << 20 },
 938                { .tag  = 'G', .mult = 1 << 30 },
 939                { .tag  = 0 },
 940        };
 941
 942        if (str == NULL)
 943                return -EINVAL;
 944
 945        val = parse_tag_value(str, tags);
 946        if (val != (unsigned long) -1) {
 947                /* we got file size value */
 948                pages = PERF_ALIGN(val, page_size) / page_size;
 949        } else {
 950                /* we got pages count value */
 951                char *eptr;
 952                pages = strtoul(str, &eptr, 10);
 953                if (*eptr != '\0')
 954                        return -EINVAL;
 955        }
 956
 957        if (pages == 0 && min == 0) {
 958                /* leave number of pages at 0 */
 959        } else if (!is_power_of_2(pages)) {
 960                char buf[100];
 961
 962                /* round pages up to next power of 2 */
 963                pages = roundup_pow_of_two(pages);
 964                if (!pages)
 965                        return -EINVAL;
 966
 967                unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
 968                pr_info("rounding mmap pages size to %s (%lu pages)\n",
 969                        buf, pages);
 970        }
 971
 972        if (pages > max)
 973                return -EINVAL;
 974
 975        return pages;
 976}
 977
 978int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
 979{
 980        unsigned long max = UINT_MAX;
 981        long pages;
 982
 983        if (max > SIZE_MAX / page_size)
 984                max = SIZE_MAX / page_size;
 985
 986        pages = parse_pages_arg(str, 1, max);
 987        if (pages < 0) {
 988                pr_err("Invalid argument for --mmap_pages/-m\n");
 989                return -1;
 990        }
 991
 992        *mmap_pages = pages;
 993        return 0;
 994}
 995
 996int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
 997                                  int unset __maybe_unused)
 998{
 999        return __perf_evlist__parse_mmap_pages(opt->value, str);
1000}
1001
1002/**
1003 * perf_evlist__mmap_ex - Create mmaps to receive events.
1004 * @evlist: list of events
1005 * @pages: map length in pages
1006 * @overwrite: overwrite older events?
1007 * @auxtrace_pages - auxtrace map length in pages
1008 * @auxtrace_overwrite - overwrite older auxtrace data?
1009 *
1010 * If @overwrite is %false the user needs to signal event consumption using
1011 * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
1012 * automatically.
1013 *
1014 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1015 * consumption using auxtrace_mmap__write_tail().
1016 *
1017 * Return: %0 on success, negative error code otherwise.
1018 */
1019int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
1020                         unsigned int auxtrace_pages,
1021                         bool auxtrace_overwrite)
1022{
1023        struct perf_evsel *evsel;
1024        const struct cpu_map *cpus = evlist->cpus;
1025        const struct thread_map *threads = evlist->threads;
1026        /*
1027         * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1028         * Its value is decided by evsel's write_backward.
1029         * So &mp should not be passed through const pointer.
1030         */
1031        struct mmap_params mp;
1032
1033        if (!evlist->mmap)
1034                evlist->mmap = perf_evlist__alloc_mmap(evlist, false);
1035        if (!evlist->mmap)
1036                return -ENOMEM;
1037
1038        if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
1039                return -ENOMEM;
1040
1041        evlist->mmap_len = perf_evlist__mmap_size(pages);
1042        pr_debug("mmap size %zuB\n", evlist->mmap_len);
1043        mp.mask = evlist->mmap_len - page_size - 1;
1044
1045        auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
1046                                   auxtrace_pages, auxtrace_overwrite);
1047
1048        evlist__for_each_entry(evlist, evsel) {
1049                if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
1050                    evsel->sample_id == NULL &&
1051                    perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
1052                        return -ENOMEM;
1053        }
1054
1055        if (cpu_map__empty(cpus))
1056                return perf_evlist__mmap_per_thread(evlist, &mp);
1057
1058        return perf_evlist__mmap_per_cpu(evlist, &mp);
1059}
1060
1061int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
1062{
1063        return perf_evlist__mmap_ex(evlist, pages, 0, false);
1064}
1065
1066int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
1067{
1068        bool all_threads = (target->per_thread && target->system_wide);
1069        struct cpu_map *cpus;
1070        struct thread_map *threads;
1071
1072        /*
1073         * If specify '-a' and '--per-thread' to perf record, perf record
1074         * will override '--per-thread'. target->per_thread = false and
1075         * target->system_wide = true.
1076         *
1077         * If specify '--per-thread' only to perf record,
1078         * target->per_thread = true and target->system_wide = false.
1079         *
1080         * So target->per_thread && target->system_wide is false.
1081         * For perf record, thread_map__new_str doesn't call
1082         * thread_map__new_all_cpus. That will keep perf record's
1083         * current behavior.
1084         *
1085         * For perf stat, it allows the case that target->per_thread and
1086         * target->system_wide are all true. It means to collect system-wide
1087         * per-thread data. thread_map__new_str will call
1088         * thread_map__new_all_cpus to enumerate all threads.
1089         */
1090        threads = thread_map__new_str(target->pid, target->tid, target->uid,
1091                                      all_threads);
1092
1093        if (!threads)
1094                return -1;
1095
1096        if (target__uses_dummy_map(target))
1097                cpus = cpu_map__dummy_new();
1098        else
1099                cpus = cpu_map__new(target->cpu_list);
1100
1101        if (!cpus)
1102                goto out_delete_threads;
1103
1104        evlist->has_user_cpus = !!target->cpu_list;
1105
1106        perf_evlist__set_maps(evlist, cpus, threads);
1107
1108        return 0;
1109
1110out_delete_threads:
1111        thread_map__put(threads);
1112        return -1;
1113}
1114
1115void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
1116                           struct thread_map *threads)
1117{
1118        /*
1119         * Allow for the possibility that one or another of the maps isn't being
1120         * changed i.e. don't put it.  Note we are assuming the maps that are
1121         * being applied are brand new and evlist is taking ownership of the
1122         * original reference count of 1.  If that is not the case it is up to
1123         * the caller to increase the reference count.
1124         */
1125        if (cpus != evlist->cpus) {
1126                cpu_map__put(evlist->cpus);
1127                evlist->cpus = cpu_map__get(cpus);
1128        }
1129
1130        if (threads != evlist->threads) {
1131                thread_map__put(evlist->threads);
1132                evlist->threads = thread_map__get(threads);
1133        }
1134
1135        perf_evlist__propagate_maps(evlist);
1136}
1137
1138void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
1139                                   enum perf_event_sample_format bit)
1140{
1141        struct perf_evsel *evsel;
1142
1143        evlist__for_each_entry(evlist, evsel)
1144                __perf_evsel__set_sample_bit(evsel, bit);
1145}
1146
1147void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
1148                                     enum perf_event_sample_format bit)
1149{
1150        struct perf_evsel *evsel;
1151
1152        evlist__for_each_entry(evlist, evsel)
1153                __perf_evsel__reset_sample_bit(evsel, bit);
1154}
1155
1156int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
1157{
1158        struct perf_evsel *evsel;
1159        int err = 0;
1160
1161        evlist__for_each_entry(evlist, evsel) {
1162                if (evsel->filter == NULL)
1163                        continue;
1164
1165                /*
1166                 * filters only work for tracepoint event, which doesn't have cpu limit.
1167                 * So evlist and evsel should always be same.
1168                 */
1169                err = perf_evsel__apply_filter(evsel, evsel->filter);
1170                if (err) {
1171                        *err_evsel = evsel;
1172                        break;
1173                }
1174        }
1175
1176        return err;
1177}
1178
1179int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
1180{
1181        struct perf_evsel *evsel;
1182        int err = 0;
1183
1184        evlist__for_each_entry(evlist, evsel) {
1185                if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
1186                        continue;
1187
1188                err = perf_evsel__set_filter(evsel, filter);
1189                if (err)
1190                        break;
1191        }
1192
1193        return err;
1194}
1195
1196int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids)
1197{
1198        char *filter;
1199        int ret = -1;
1200        size_t i;
1201
1202        for (i = 0; i < npids; ++i) {
1203                if (i == 0) {
1204                        if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1205                                return -1;
1206                } else {
1207                        char *tmp;
1208
1209                        if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1210                                goto out_free;
1211
1212                        free(filter);
1213                        filter = tmp;
1214                }
1215        }
1216
1217        ret = perf_evlist__set_filter(evlist, filter);
1218out_free:
1219        free(filter);
1220        return ret;
1221}
1222
1223int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid)
1224{
1225        return perf_evlist__set_filter_pids(evlist, 1, &pid);
1226}
1227
1228bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
1229{
1230        struct perf_evsel *pos;
1231
1232        if (evlist->nr_entries == 1)
1233                return true;
1234
1235        if (evlist->id_pos < 0 || evlist->is_pos < 0)
1236                return false;
1237
1238        evlist__for_each_entry(evlist, pos) {
1239                if (pos->id_pos != evlist->id_pos ||
1240                    pos->is_pos != evlist->is_pos)
1241                        return false;
1242        }
1243
1244        return true;
1245}
1246
1247u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1248{
1249        struct perf_evsel *evsel;
1250
1251        if (evlist->combined_sample_type)
1252                return evlist->combined_sample_type;
1253
1254        evlist__for_each_entry(evlist, evsel)
1255                evlist->combined_sample_type |= evsel->attr.sample_type;
1256
1257        return evlist->combined_sample_type;
1258}
1259
1260u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1261{
1262        evlist->combined_sample_type = 0;
1263        return __perf_evlist__combined_sample_type(evlist);
1264}
1265
1266u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist)
1267{
1268        struct perf_evsel *evsel;
1269        u64 branch_type = 0;
1270
1271        evlist__for_each_entry(evlist, evsel)
1272                branch_type |= evsel->attr.branch_sample_type;
1273        return branch_type;
1274}
1275
1276bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
1277{
1278        struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1279        u64 read_format = first->attr.read_format;
1280        u64 sample_type = first->attr.sample_type;
1281
1282        evlist__for_each_entry(evlist, pos) {
1283                if (read_format != pos->attr.read_format)
1284                        return false;
1285        }
1286
1287        /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1288        if ((sample_type & PERF_SAMPLE_READ) &&
1289            !(read_format & PERF_FORMAT_ID)) {
1290                return false;
1291        }
1292
1293        return true;
1294}
1295
1296u64 perf_evlist__read_format(struct perf_evlist *evlist)
1297{
1298        struct perf_evsel *first = perf_evlist__first(evlist);
1299        return first->attr.read_format;
1300}
1301
1302u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
1303{
1304        struct perf_evsel *first = perf_evlist__first(evlist);
1305        struct perf_sample *data;
1306        u64 sample_type;
1307        u16 size = 0;
1308
1309        if (!first->attr.sample_id_all)
1310                goto out;
1311
1312        sample_type = first->attr.sample_type;
1313
1314        if (sample_type & PERF_SAMPLE_TID)
1315                size += sizeof(data->tid) * 2;
1316
1317       if (sample_type & PERF_SAMPLE_TIME)
1318                size += sizeof(data->time);
1319
1320        if (sample_type & PERF_SAMPLE_ID)
1321                size += sizeof(data->id);
1322
1323        if (sample_type & PERF_SAMPLE_STREAM_ID)
1324                size += sizeof(data->stream_id);
1325
1326        if (sample_type & PERF_SAMPLE_CPU)
1327                size += sizeof(data->cpu) * 2;
1328
1329        if (sample_type & PERF_SAMPLE_IDENTIFIER)
1330                size += sizeof(data->id);
1331out:
1332        return size;
1333}
1334
1335bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
1336{
1337        struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1338
1339        evlist__for_each_entry_continue(evlist, pos) {
1340                if (first->attr.sample_id_all != pos->attr.sample_id_all)
1341                        return false;
1342        }
1343
1344        return true;
1345}
1346
1347bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
1348{
1349        struct perf_evsel *first = perf_evlist__first(evlist);
1350        return first->attr.sample_id_all;
1351}
1352
1353void perf_evlist__set_selected(struct perf_evlist *evlist,
1354                               struct perf_evsel *evsel)
1355{
1356        evlist->selected = evsel;
1357}
1358
1359void perf_evlist__close(struct perf_evlist *evlist)
1360{
1361        struct perf_evsel *evsel;
1362
1363        evlist__for_each_entry_reverse(evlist, evsel)
1364                perf_evsel__close(evsel);
1365}
1366
1367static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
1368{
1369        struct cpu_map    *cpus;
1370        struct thread_map *threads;
1371        int err = -ENOMEM;
1372
1373        /*
1374         * Try reading /sys/devices/system/cpu/online to get
1375         * an all cpus map.
1376         *
1377         * FIXME: -ENOMEM is the best we can do here, the cpu_map
1378         * code needs an overhaul to properly forward the
1379         * error, and we may not want to do that fallback to a
1380         * default cpu identity map :-\
1381         */
1382        cpus = cpu_map__new(NULL);
1383        if (!cpus)
1384                goto out;
1385
1386        threads = thread_map__new_dummy();
1387        if (!threads)
1388                goto out_put;
1389
1390        perf_evlist__set_maps(evlist, cpus, threads);
1391out:
1392        return err;
1393out_put:
1394        cpu_map__put(cpus);
1395        goto out;
1396}
1397
1398int perf_evlist__open(struct perf_evlist *evlist)
1399{
1400        struct perf_evsel *evsel;
1401        int err;
1402
1403        /*
1404         * Default: one fd per CPU, all threads, aka systemwide
1405         * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1406         */
1407        if (evlist->threads == NULL && evlist->cpus == NULL) {
1408                err = perf_evlist__create_syswide_maps(evlist);
1409                if (err < 0)
1410                        goto out_err;
1411        }
1412
1413        perf_evlist__update_id_pos(evlist);
1414
1415        evlist__for_each_entry(evlist, evsel) {
1416                err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
1417                if (err < 0)
1418                        goto out_err;
1419        }
1420
1421        return 0;
1422out_err:
1423        perf_evlist__close(evlist);
1424        errno = -err;
1425        return err;
1426}
1427
1428int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1429                                  const char *argv[], bool pipe_output,
1430                                  void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1431{
1432        int child_ready_pipe[2], go_pipe[2];
1433        char bf;
1434
1435        if (pipe(child_ready_pipe) < 0) {
1436                perror("failed to create 'ready' pipe");
1437                return -1;
1438        }
1439
1440        if (pipe(go_pipe) < 0) {
1441                perror("failed to create 'go' pipe");
1442                goto out_close_ready_pipe;
1443        }
1444
1445        evlist->workload.pid = fork();
1446        if (evlist->workload.pid < 0) {
1447                perror("failed to fork");
1448                goto out_close_pipes;
1449        }
1450
1451        if (!evlist->workload.pid) {
1452                int ret;
1453
1454                if (pipe_output)
1455                        dup2(2, 1);
1456
1457                signal(SIGTERM, SIG_DFL);
1458
1459                close(child_ready_pipe[0]);
1460                close(go_pipe[1]);
1461                fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1462
1463                /*
1464                 * Tell the parent we're ready to go
1465                 */
1466                close(child_ready_pipe[1]);
1467
1468                /*
1469                 * Wait until the parent tells us to go.
1470                 */
1471                ret = read(go_pipe[0], &bf, 1);
1472                /*
1473                 * The parent will ask for the execvp() to be performed by
1474                 * writing exactly one byte, in workload.cork_fd, usually via
1475                 * perf_evlist__start_workload().
1476                 *
1477                 * For cancelling the workload without actually running it,
1478                 * the parent will just close workload.cork_fd, without writing
1479                 * anything, i.e. read will return zero and we just exit()
1480                 * here.
1481                 */
1482                if (ret != 1) {
1483                        if (ret == -1)
1484                                perror("unable to read pipe");
1485                        exit(ret);
1486                }
1487
1488                execvp(argv[0], (char **)argv);
1489
1490                if (exec_error) {
1491                        union sigval val;
1492
1493                        val.sival_int = errno;
1494                        if (sigqueue(getppid(), SIGUSR1, val))
1495                                perror(argv[0]);
1496                } else
1497                        perror(argv[0]);
1498                exit(-1);
1499        }
1500
1501        if (exec_error) {
1502                struct sigaction act = {
1503                        .sa_flags     = SA_SIGINFO,
1504                        .sa_sigaction = exec_error,
1505                };
1506                sigaction(SIGUSR1, &act, NULL);
1507        }
1508
1509        if (target__none(target)) {
1510                if (evlist->threads == NULL) {
1511                        fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1512                                __func__, __LINE__);
1513                        goto out_close_pipes;
1514                }
1515                thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
1516        }
1517
1518        close(child_ready_pipe[1]);
1519        close(go_pipe[0]);
1520        /*
1521         * wait for child to settle
1522         */
1523        if (read(child_ready_pipe[0], &bf, 1) == -1) {
1524                perror("unable to read pipe");
1525                goto out_close_pipes;
1526        }
1527
1528        fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1529        evlist->workload.cork_fd = go_pipe[1];
1530        close(child_ready_pipe[0]);
1531        return 0;
1532
1533out_close_pipes:
1534        close(go_pipe[0]);
1535        close(go_pipe[1]);
1536out_close_ready_pipe:
1537        close(child_ready_pipe[0]);
1538        close(child_ready_pipe[1]);
1539        return -1;
1540}
1541
1542int perf_evlist__start_workload(struct perf_evlist *evlist)
1543{
1544        if (evlist->workload.cork_fd > 0) {
1545                char bf = 0;
1546                int ret;
1547                /*
1548                 * Remove the cork, let it rip!
1549                 */
1550                ret = write(evlist->workload.cork_fd, &bf, 1);
1551                if (ret < 0)
1552                        perror("unable to write to pipe");
1553
1554                close(evlist->workload.cork_fd);
1555                return ret;
1556        }
1557
1558        return 0;
1559}
1560
1561int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1562                              struct perf_sample *sample)
1563{
1564        struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1565
1566        if (!evsel)
1567                return -EFAULT;
1568        return perf_evsel__parse_sample(evsel, event, sample);
1569}
1570
1571int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
1572                                        union perf_event *event,
1573                                        u64 *timestamp)
1574{
1575        struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1576
1577        if (!evsel)
1578                return -EFAULT;
1579        return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1580}
1581
1582size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1583{
1584        struct perf_evsel *evsel;
1585        size_t printed = 0;
1586
1587        evlist__for_each_entry(evlist, evsel) {
1588                printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1589                                   perf_evsel__name(evsel));
1590        }
1591
1592        return printed + fprintf(fp, "\n");
1593}
1594
1595int perf_evlist__strerror_open(struct perf_evlist *evlist,
1596                               int err, char *buf, size_t size)
1597{
1598        int printed, value;
1599        char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1600
1601        switch (err) {
1602        case EACCES:
1603        case EPERM:
1604                printed = scnprintf(buf, size,
1605                                    "Error:\t%s.\n"
1606                                    "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1607
1608                value = perf_event_paranoid();
1609
1610                printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1611
1612                if (value >= 2) {
1613                        printed += scnprintf(buf + printed, size - printed,
1614                                             "For your workloads it needs to be <= 1\nHint:\t");
1615                }
1616                printed += scnprintf(buf + printed, size - printed,
1617                                     "For system wide tracing it needs to be set to -1.\n");
1618
1619                printed += scnprintf(buf + printed, size - printed,
1620                                    "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1621                                    "Hint:\tThe current value is %d.", value);
1622                break;
1623        case EINVAL: {
1624                struct perf_evsel *first = perf_evlist__first(evlist);
1625                int max_freq;
1626
1627                if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1628                        goto out_default;
1629
1630                if (first->attr.sample_freq < (u64)max_freq)
1631                        goto out_default;
1632
1633                printed = scnprintf(buf, size,
1634                                    "Error:\t%s.\n"
1635                                    "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1636                                    "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1637                                    emsg, max_freq, first->attr.sample_freq);
1638                break;
1639        }
1640        default:
1641out_default:
1642                scnprintf(buf, size, "%s", emsg);
1643                break;
1644        }
1645
1646        return 0;
1647}
1648
1649int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
1650{
1651        char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1652        int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
1653
1654        switch (err) {
1655        case EPERM:
1656                sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1657                printed += scnprintf(buf + printed, size - printed,
1658                                     "Error:\t%s.\n"
1659                                     "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1660                                     "Hint:\tTried using %zd kB.\n",
1661                                     emsg, pages_max_per_user, pages_attempted);
1662
1663                if (pages_attempted >= pages_max_per_user) {
1664                        printed += scnprintf(buf + printed, size - printed,
1665                                             "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1666                                             pages_max_per_user + pages_attempted);
1667                }
1668
1669                printed += scnprintf(buf + printed, size - printed,
1670                                     "Hint:\tTry using a smaller -m/--mmap-pages value.");
1671                break;
1672        default:
1673                scnprintf(buf, size, "%s", emsg);
1674                break;
1675        }
1676
1677        return 0;
1678}
1679
1680void perf_evlist__to_front(struct perf_evlist *evlist,
1681                           struct perf_evsel *move_evsel)
1682{
1683        struct perf_evsel *evsel, *n;
1684        LIST_HEAD(move);
1685
1686        if (move_evsel == perf_evlist__first(evlist))
1687                return;
1688
1689        evlist__for_each_entry_safe(evlist, n, evsel) {
1690                if (evsel->leader == move_evsel->leader)
1691                        list_move_tail(&evsel->node, &move);
1692        }
1693
1694        list_splice(&move, &evlist->entries);
1695}
1696
1697void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
1698                                     struct perf_evsel *tracking_evsel)
1699{
1700        struct perf_evsel *evsel;
1701
1702        if (tracking_evsel->tracking)
1703                return;
1704
1705        evlist__for_each_entry(evlist, evsel) {
1706                if (evsel != tracking_evsel)
1707                        evsel->tracking = false;
1708        }
1709
1710        tracking_evsel->tracking = true;
1711}
1712
1713struct perf_evsel *
1714perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
1715                               const char *str)
1716{
1717        struct perf_evsel *evsel;
1718
1719        evlist__for_each_entry(evlist, evsel) {
1720                if (!evsel->name)
1721                        continue;
1722                if (strcmp(str, evsel->name) == 0)
1723                        return evsel;
1724        }
1725
1726        return NULL;
1727}
1728
1729void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist,
1730                                  enum bkw_mmap_state state)
1731{
1732        enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1733        enum action {
1734                NONE,
1735                PAUSE,
1736                RESUME,
1737        } action = NONE;
1738
1739        if (!evlist->overwrite_mmap)
1740                return;
1741
1742        switch (old_state) {
1743        case BKW_MMAP_NOTREADY: {
1744                if (state != BKW_MMAP_RUNNING)
1745                        goto state_err;
1746                break;
1747        }
1748        case BKW_MMAP_RUNNING: {
1749                if (state != BKW_MMAP_DATA_PENDING)
1750                        goto state_err;
1751                action = PAUSE;
1752                break;
1753        }
1754        case BKW_MMAP_DATA_PENDING: {
1755                if (state != BKW_MMAP_EMPTY)
1756                        goto state_err;
1757                break;
1758        }
1759        case BKW_MMAP_EMPTY: {
1760                if (state != BKW_MMAP_RUNNING)
1761                        goto state_err;
1762                action = RESUME;
1763                break;
1764        }
1765        default:
1766                WARN_ONCE(1, "Shouldn't get there\n");
1767        }
1768
1769        evlist->bkw_mmap_state = state;
1770
1771        switch (action) {
1772        case PAUSE:
1773                perf_evlist__pause(evlist);
1774                break;
1775        case RESUME:
1776                perf_evlist__resume(evlist);
1777                break;
1778        case NONE:
1779        default:
1780                break;
1781        }
1782
1783state_err:
1784        return;
1785}
1786
1787bool perf_evlist__exclude_kernel(struct perf_evlist *evlist)
1788{
1789        struct perf_evsel *evsel;
1790
1791        evlist__for_each_entry(evlist, evsel) {
1792                if (!evsel->attr.exclude_kernel)
1793                        return false;
1794        }
1795
1796        return true;
1797}
1798
1799/*
1800 * Events in data file are not collect in groups, but we still want
1801 * the group display. Set the artificial group and set the leader's
1802 * forced_leader flag to notify the display code.
1803 */
1804void perf_evlist__force_leader(struct perf_evlist *evlist)
1805{
1806        if (!evlist->nr_groups) {
1807                struct perf_evsel *leader = perf_evlist__first(evlist);
1808
1809                perf_evlist__set_leader(evlist);
1810                leader->forced_leader = true;
1811        }
1812}
1813