tools/perf/util/evlist.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   4  *
   5  * Parts came from builtin-{top,stat,record}.c, see those files for further
   6  * copyright notes.
   7  */
   8 #include <api/fs/fs.h>
   9 #include <errno.h>
  10 #include <inttypes.h>
  11 #include <poll.h>
  12 #include "cpumap.h"
  13 #include "util/mmap.h"
  14 #include "thread_map.h"
  15 #include "target.h"
  16 #include "evlist.h"
  17 #include "evsel.h"
  18 #include "record.h"
  19 #include "debug.h"
  20 #include "units.h"
  21 #include "bpf_counter.h"
  22 #include <internal/lib.h> // page_size
  23 #include "affinity.h"
  24 #include "../perf.h"
  25 #include "asm/bug.h"
  26 #include "bpf-event.h"
  27 #include "util/event.h"
  28 #include "util/string2.h"
  29 #include "util/perf_api_probe.h"
  30 #include "util/evsel_fprintf.h"
  31 #include "util/pmu.h"
  32 #include "util/sample.h"
  33 #include "util/bpf-filter.h"
  34 #include "util/stat.h"
  35 #include "util/util.h"
  36 #include <signal.h>
  37 #include <unistd.h>
  38 #include <sched.h>
  39 #include <stdlib.h>
  40
  41 #include "parse-events.h"
  42 #include <subcmd/parse-options.h>
  43
  44 #include <fcntl.h>
  45 #include <sys/ioctl.h>
  46 #include <sys/mman.h>
  47 #include <sys/prctl.h>
  48 #include <sys/timerfd.h>
  49
  50 #include <linux/bitops.h>
  51 #include <linux/hash.h>
  52 #include <linux/log2.h>
  53 #include <linux/err.h>
  54 #include <linux/string.h>
  55 #include <linux/time64.h>
  56 #include <linux/zalloc.h>
  57 #include <perf/evlist.h>
  58 #include <perf/evsel.h>
  59 #include <perf/cpumap.h>
  60 #include <perf/mmap.h>
  61
  62 #include <internal/xyarray.h>
  63
  64 #ifdef LACKS_SIGQUEUE_PROTOTYPE
  65 int sigqueue(pid_t pid, int sig, const union sigval value);
  66 #endif
  67
  68 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
  69 #define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
  70
  71 void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
  72                   struct perf_thread_map *threads)
  73 {
  74         perf_evlist__init(&evlist->core);
  75         perf_evlist__set_maps(&evlist->core, cpus, threads);
  76         evlist->workload.pid = -1;
  77         evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
  78         evlist->ctl_fd.fd = -1;
  79         evlist->ctl_fd.ack = -1;
  80         evlist->ctl_fd.pos = -1;
  81 }
  82
  83 struct evlist *evlist__new(void)
  84 {
  85         struct evlist *evlist = zalloc(sizeof(*evlist));
  86
  87         if (evlist != NULL)
  88                 evlist__init(evlist, NULL, NULL);
  89
  90         return evlist;
  91 }
  92
  93 struct evlist *evlist__new_default(void)
  94 {
  95         struct evlist *evlist = evlist__new();
  96         bool can_profile_kernel;
  97         int err;
  98
  99         if (!evlist)
 100                 return NULL;
 101
 102         can_profile_kernel = perf_event_paranoid_check(1);
 103         err = parse_event(evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
 104         if (err) {
 105                 evlist__delete(evlist);
 106                 return NULL;
 107         }
 108
 109         if (evlist->core.nr_entries > 1) {
 110                 struct evsel *evsel;
 111
 112                 evlist__for_each_entry(evlist, evsel)
 113                         evsel__set_sample_id(evsel, /*can_sample_identifier=*/false);
 114         }
 115
 116         return evlist;
 117 }
 118
 119 struct evlist *evlist__new_dummy(void)
 120 {
 121         struct evlist *evlist = evlist__new();
 122
 123         if (evlist && evlist__add_dummy(evlist)) {
 124                 evlist__delete(evlist);
 125                 evlist = NULL;
 126         }
 127
 128         return evlist;
 129 }
 130
 131 /**
 132  * evlist__set_id_pos - set the positions of event ids.
 133  * @evlist: selected event list
 134  *
 135  * Events with compatible sample types all have the same id_pos
 136  * and is_pos.  For convenience, put a copy on evlist.
 137  */
 138 void evlist__set_id_pos(struct evlist *evlist)
 139 {
 140         struct evsel *first = evlist__first(evlist);
 141
 142         evlist->id_pos = first->id_pos;
 143         evlist->is_pos = first->is_pos;
 144 }
 145
 146 static void evlist__update_id_pos(struct evlist *evlist)
 147 {
 148         struct evsel *evsel;
 149
 150         evlist__for_each_entry(evlist, evsel)
 151                 evsel__calc_id_pos(evsel);
 152
 153         evlist__set_id_pos(evlist);
 154 }
 155
 156 static void evlist__purge(struct evlist *evlist)
 157 {
 158         struct evsel *pos, *n;
 159
 160         evlist__for_each_entry_safe(evlist, n, pos) {
 161                 list_del_init(&pos->core.node);
 162                 pos->evlist = NULL;
 163                 evsel__delete(pos);
 164         }
 165
 166         evlist->core.nr_entries = 0;
 167 }
 168
 169 void evlist__exit(struct evlist *evlist)
 170 {
 171         event_enable_timer__exit(&evlist->eet);
 172         zfree(&evlist->mmap);
 173         zfree(&evlist->overwrite_mmap);
 174         perf_evlist__exit(&evlist->core);
 175 }
 176
 177 void evlist__delete(struct evlist *evlist)
 178 {
 179         if (evlist == NULL)
 180                 return;
 181
 182         evlist__free_stats(evlist);
 183         evlist__munmap(evlist);
 184         evlist__close(evlist);
 185         evlist__purge(evlist);
 186         evlist__exit(evlist);
 187         free(evlist);
 188 }
 189
 190 void evlist__add(struct evlist *evlist, struct evsel *entry)
 191 {
 192         perf_evlist__add(&evlist->core, &entry->core);
 193         entry->evlist = evlist;
 194         entry->tracking = !entry->core.idx;
 195
 196         if (evlist->core.nr_entries == 1)
 197                 evlist__set_id_pos(evlist);
 198 }
 199
 200 void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 201 {
 202         evsel->evlist = NULL;
 203         perf_evlist__remove(&evlist->core, &evsel->core);
 204 }
 205
 206 void evlist__splice_list_tail(struct evlist *evlist, struct list_head *list)
 207 {
 208         while (!list_empty(list)) {
 209                 struct evsel *evsel, *temp, *leader = NULL;
 210
 211                 __evlist__for_each_entry_safe(list, temp, evsel) {
 212                         list_del_init(&evsel->core.node);
 213                         evlist__add(evlist, evsel);
 214                         leader = evsel;
 215                         break;
 216                 }
 217
 218                 __evlist__for_each_entry_safe(list, temp, evsel) {
 219                         if (evsel__has_leader(evsel, leader)) {
 220                                 list_del_init(&evsel->core.node);
 221                                 evlist__add(evlist, evsel);
 222                         }
 223                 }
 224         }
 225 }
 226
 227 int __evlist__set_tracepoints_handlers(struct evlist *evlist,
 228                                        const struct evsel_str_handler *assocs, size_t nr_assocs)
 229 {
 230         size_t i;
 231         int err;
 232
 233         for (i = 0; i < nr_assocs; i++) {
 234                 // Adding a handler for an event not in this evlist, just ignore it.
 235                 struct evsel *evsel = evlist__find_tracepoint_by_name(evlist, assocs[i].name);
 236                 if (evsel == NULL)
 237                         continue;
 238
 239                 err = -EEXIST;
 240                 if (evsel->handler != NULL)
 241                         goto out;
 242                 evsel->handler = assocs[i].handler;
 243         }
 244
 245         err = 0;
 246 out:
 247         return err;
 248 }
 249
 250 static void evlist__set_leader(struct evlist *evlist)
 251 {
 252         perf_evlist__set_leader(&evlist->core);
 253 }
 254
 255 static struct evsel *evlist__dummy_event(struct evlist *evlist)
 256 {
 257         struct perf_event_attr attr = {
 258                 .type   = PERF_TYPE_SOFTWARE,
 259                 .config = PERF_COUNT_SW_DUMMY,
 260                 .size   = sizeof(attr), /* to capture ABI version */
 261                 /* Avoid frequency mode for dummy events to avoid associated timers. */
 262                 .freq = 0,
 263                 .sample_period = 1,
 264         };
 265
 266         return evsel__new_idx(&attr, evlist->core.nr_entries);
 267 }
 268
 269 int evlist__add_dummy(struct evlist *evlist)
 270 {
 271         struct evsel *evsel = evlist__dummy_event(evlist);
 272
 273         if (evsel == NULL)
 274                 return -ENOMEM;
 275
 276         evlist__add(evlist, evsel);
 277         return 0;
 278 }
 279
 280 struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide)
 281 {
 282         struct evsel *evsel = evlist__dummy_event(evlist);
 283
 284         if (!evsel)
 285                 return NULL;
 286
 287         evsel->core.attr.exclude_kernel = 1;
 288         evsel->core.attr.exclude_guest = 1;
 289         evsel->core.attr.exclude_hv = 1;
 290         evsel->core.system_wide = system_wide;
 291         evsel->no_aux_samples = true;
 292         evsel->name = strdup("dummy:u");
 293
 294         evlist__add(evlist, evsel);
 295         return evsel;
 296 }
 297
 298 #ifdef HAVE_LIBTRACEEVENT
 299 struct evsel *evlist__add_sched_switch(struct evlist *evlist, bool system_wide)
 300 {
 301         struct evsel *evsel = evsel__newtp_idx("sched", "sched_switch", 0);
 302
 303         if (IS_ERR(evsel))
 304                 return evsel;
 305
 306         evsel__set_sample_bit(evsel, CPU);
 307         evsel__set_sample_bit(evsel, TIME);
 308
 309         evsel->core.system_wide = system_wide;
 310         evsel->no_aux_samples = true;
 311
 312         evlist__add(evlist, evsel);
 313         return evsel;
 314 }
 315 #endif
 316
 317 int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
 318 {
 319         struct evsel *evsel, *n;
 320         LIST_HEAD(head);
 321         size_t i;
 322
 323         for (i = 0; i < nr_attrs; i++) {
 324                 evsel = evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
 325                 if (evsel == NULL)
 326                         goto out_delete_partial_list;
 327                 list_add_tail(&evsel->core.node, &head);
 328         }
 329
 330         evlist__splice_list_tail(evlist, &head);
 331
 332         return 0;
 333
 334 out_delete_partial_list:
 335         __evlist__for_each_entry_safe(&head, n, evsel)
 336                 evsel__delete(evsel);
 337         return -1;
 338 }
 339
 340 int __evlist__add_default_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
 341 {
 342         size_t i;
 343
 344         for (i = 0; i < nr_attrs; i++)
 345                 event_attr_init(attrs + i);
 346
 347         return evlist__add_attrs(evlist, attrs, nr_attrs);
 348 }
 349
 350 __weak int arch_evlist__add_default_attrs(struct evlist *evlist,
 351                                           struct perf_event_attr *attrs,
 352                                           size_t nr_attrs)
 353 {
 354         if (!nr_attrs)
 355                 return 0;
 356
 357         return __evlist__add_default_attrs(evlist, attrs, nr_attrs);
 358 }
 359
 360 struct evsel *evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
 361 {
 362         struct evsel *evsel;
 363
 364         evlist__for_each_entry(evlist, evsel) {
 365                 if (evsel->core.attr.type   == PERF_TYPE_TRACEPOINT &&
 366                     (int)evsel->core.attr.config == id)
 367                         return evsel;
 368         }
 369
 370         return NULL;
 371 }
 372
 373 struct evsel *evlist__find_tracepoint_by_name(struct evlist *evlist, const char *name)
 374 {
 375         struct evsel *evsel;
 376
 377         evlist__for_each_entry(evlist, evsel) {
 378                 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
 379                     (strcmp(evsel->name, name) == 0))
 380                         return evsel;
 381         }
 382
 383         return NULL;
 384 }
 385
 386 #ifdef HAVE_LIBTRACEEVENT
 387 int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler)
 388 {
 389         struct evsel *evsel = evsel__newtp(sys, name);
 390
 391         if (IS_ERR(evsel))
 392                 return -1;
 393
 394         evsel->handler = handler;
 395         evlist__add(evlist, evsel);
 396         return 0;
 397 }
 398 #endif
 399
 400 struct evlist_cpu_iterator evlist__cpu_begin(struct evlist *evlist, struct affinity *affinity)
 401 {
 402         struct evlist_cpu_iterator itr = {
 403                 .container = evlist,
 404                 .evsel = NULL,
 405                 .cpu_map_idx = 0,
 406                 .evlist_cpu_map_idx = 0,
 407                 .evlist_cpu_map_nr = perf_cpu_map__nr(evlist->core.all_cpus),
 408                 .cpu = (struct perf_cpu){ .cpu = -1},
 409                 .affinity = affinity,
 410         };
 411
 412         if (evlist__empty(evlist)) {
 413                 /* Ensure the empty list doesn't iterate. */
 414                 itr.evlist_cpu_map_idx = itr.evlist_cpu_map_nr;
 415         } else {
 416                 itr.evsel = evlist__first(evlist);
 417                 if (itr.affinity) {
 418                         itr.cpu = perf_cpu_map__cpu(evlist->core.all_cpus, 0);
 419                         affinity__set(itr.affinity, itr.cpu.cpu);
 420                         itr.cpu_map_idx = perf_cpu_map__idx(itr.evsel->core.cpus, itr.cpu);
 421                         /*
 422                          * If this CPU isn't in the evsel's cpu map then advance
 423                          * through the list.
 424                          */
 425                         if (itr.cpu_map_idx == -1)
 426                                 evlist_cpu_iterator__next(&itr);
 427                 }
 428         }
 429         return itr;
 430 }
 431
 432 void evlist_cpu_iterator__next(struct evlist_cpu_iterator *evlist_cpu_itr)
 433 {
 434         while (evlist_cpu_itr->evsel != evlist__last(evlist_cpu_itr->container)) {
 435                 evlist_cpu_itr->evsel = evsel__next(evlist_cpu_itr->evsel);
 436                 evlist_cpu_itr->cpu_map_idx =
 437                         perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
 438                                           evlist_cpu_itr->cpu);
 439                 if (evlist_cpu_itr->cpu_map_idx != -1)
 440                         return;
 441         }
 442         evlist_cpu_itr->evlist_cpu_map_idx++;
 443         if (evlist_cpu_itr->evlist_cpu_map_idx < evlist_cpu_itr->evlist_cpu_map_nr) {
 444                 evlist_cpu_itr->evsel = evlist__first(evlist_cpu_itr->container);
 445                 evlist_cpu_itr->cpu =
 446                         perf_cpu_map__cpu(evlist_cpu_itr->container->core.all_cpus,
 447                                           evlist_cpu_itr->evlist_cpu_map_idx);
 448                 if (evlist_cpu_itr->affinity)
 449                         affinity__set(evlist_cpu_itr->affinity, evlist_cpu_itr->cpu.cpu);
 450                 evlist_cpu_itr->cpu_map_idx =
 451                         perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
 452                                           evlist_cpu_itr->cpu);
 453                 /*
 454                  * If this CPU isn't in the evsel's cpu map then advance through
 455                  * the list.
 456                  */
 457                 if (evlist_cpu_itr->cpu_map_idx == -1)
 458                         evlist_cpu_iterator__next(evlist_cpu_itr);
 459         }
 460 }
 461
 462 bool evlist_cpu_iterator__end(const struct evlist_cpu_iterator *evlist_cpu_itr)
 463 {
 464         return evlist_cpu_itr->evlist_cpu_map_idx >= evlist_cpu_itr->evlist_cpu_map_nr;
 465 }
 466
 467 static int evsel__strcmp(struct evsel *pos, char *evsel_name)
 468 {
 469         if (!evsel_name)
 470                 return 0;
 471         if (evsel__is_dummy_event(pos))
 472                 return 1;
 473         return !evsel__name_is(pos, evsel_name);
 474 }
 475
 476 static int evlist__is_enabled(struct evlist *evlist)
 477 {
 478         struct evsel *pos;
 479
 480         evlist__for_each_entry(evlist, pos) {
 481                 if (!evsel__is_group_leader(pos) || !pos->core.fd)
 482                         continue;
 483                 /* If at least one event is enabled, evlist is enabled. */
 484                 if (!pos->disabled)
 485                         return true;
 486         }
 487         return false;
 488 }
 489
 490 static void __evlist__disable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
 491 {
 492         struct evsel *pos;
 493         struct evlist_cpu_iterator evlist_cpu_itr;
 494         struct affinity saved_affinity, *affinity = NULL;
 495         bool has_imm = false;
 496
 497         // See explanation in evlist__close()
 498         if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
 499                 if (affinity__setup(&saved_affinity) < 0)
 500                         return;
 501                 affinity = &saved_affinity;
 502         }
 503
 504         /* Disable 'immediate' events last */
 505         for (int imm = 0; imm <= 1; imm++) {
 506                 evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
 507                         pos = evlist_cpu_itr.evsel;
 508                         if (evsel__strcmp(pos, evsel_name))
 509                                 continue;
 510                         if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
 511                                 continue;
 512                         if (excl_dummy && evsel__is_dummy_event(pos))
 513                                 continue;
 514                         if (pos->immediate)
 515                                 has_imm = true;
 516                         if (pos->immediate != imm)
 517                                 continue;
 518                         evsel__disable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
 519                 }
 520                 if (!has_imm)
 521                         break;
 522         }
 523
 524         affinity__cleanup(affinity);
 525         evlist__for_each_entry(evlist, pos) {
 526                 if (evsel__strcmp(pos, evsel_name))
 527                         continue;
 528                 if (!evsel__is_group_leader(pos) || !pos->core.fd)
 529                         continue;
 530                 if (excl_dummy && evsel__is_dummy_event(pos))
 531                         continue;
 532                 pos->disabled = true;
 533         }
 534
 535         /*
 536          * If we disabled only single event, we need to check
 537          * the enabled state of the evlist manually.
 538          */
 539         if (evsel_name)
 540                 evlist->enabled = evlist__is_enabled(evlist);
 541         else
 542                 evlist->enabled = false;
 543 }
 544
 545 void evlist__disable(struct evlist *evlist)
 546 {
 547         __evlist__disable(evlist, NULL, false);
 548 }
 549
 550 void evlist__disable_non_dummy(struct evlist *evlist)
 551 {
 552         __evlist__disable(evlist, NULL, true);
 553 }
 554
 555 void evlist__disable_evsel(struct evlist *evlist, char *evsel_name)
 556 {
 557         __evlist__disable(evlist, evsel_name, false);
 558 }
 559
 560 static void __evlist__enable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
 561 {
 562         struct evsel *pos;
 563         struct evlist_cpu_iterator evlist_cpu_itr;
 564         struct affinity saved_affinity, *affinity = NULL;
 565
 566         // See explanation in evlist__close()
 567         if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
 568                 if (affinity__setup(&saved_affinity) < 0)
 569                         return;
 570                 affinity = &saved_affinity;
 571         }
 572
 573         evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
 574                 pos = evlist_cpu_itr.evsel;
 575                 if (evsel__strcmp(pos, evsel_name))
 576                         continue;
 577                 if (!evsel__is_group_leader(pos) || !pos->core.fd)
 578                         continue;
 579                 if (excl_dummy && evsel__is_dummy_event(pos))
 580                         continue;
 581                 evsel__enable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
 582         }
 583         affinity__cleanup(affinity);
 584         evlist__for_each_entry(evlist, pos) {
 585                 if (evsel__strcmp(pos, evsel_name))
 586                         continue;
 587                 if (!evsel__is_group_leader(pos) || !pos->core.fd)
 588                         continue;
 589                 if (excl_dummy && evsel__is_dummy_event(pos))
 590                         continue;
 591                 pos->disabled = false;
 592         }
 593
 594         /*
 595          * Even single event sets the 'enabled' for evlist,
 596          * so the toggle can work properly and toggle to
 597          * 'disabled' state.
 598          */
 599         evlist->enabled = true;
 600 }
 601
 602 void evlist__enable(struct evlist *evlist)
 603 {
 604         __evlist__enable(evlist, NULL, false);
 605 }
 606
 607 void evlist__enable_non_dummy(struct evlist *evlist)
 608 {
 609         __evlist__enable(evlist, NULL, true);
 610 }
 611
 612 void evlist__enable_evsel(struct evlist *evlist, char *evsel_name)
 613 {
 614         __evlist__enable(evlist, evsel_name, false);
 615 }
 616
 617 void evlist__toggle_enable(struct evlist *evlist)
 618 {
 619         (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
 620 }
 621
 622 int evlist__add_pollfd(struct evlist *evlist, int fd)
 623 {
 624         return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default);
 625 }
 626
 627 int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
 628 {
 629         return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask);
 630 }
 631
 632 #ifdef HAVE_EVENTFD_SUPPORT
 633 int evlist__add_wakeup_eventfd(struct evlist *evlist, int fd)
 634 {
 635         return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
 636                                        fdarray_flag__nonfilterable |
 637                                        fdarray_flag__non_perf_event);
 638 }
 639 #endif
 640
 641 int evlist__poll(struct evlist *evlist, int timeout)
 642 {
 643         return perf_evlist__poll(&evlist->core, timeout);
 644 }
 645
 646 struct perf_sample_id *evlist__id2sid(struct evlist *evlist, u64 id)
 647 {
 648         struct hlist_head *head;
 649         struct perf_sample_id *sid;
 650         int hash;
 651
 652         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 653         head = &evlist->core.heads[hash];
 654
 655         hlist_for_each_entry(sid, head, node)
 656                 if (sid->id == id)
 657                         return sid;
 658
 659         return NULL;
 660 }
 661
 662 struct evsel *evlist__id2evsel(struct evlist *evlist, u64 id)
 663 {
 664         struct perf_sample_id *sid;
 665
 666         if (evlist->core.nr_entries == 1 || !id)
 667                 return evlist__first(evlist);
 668
 669         sid = evlist__id2sid(evlist, id);
 670         if (sid)
 671                 return container_of(sid->evsel, struct evsel, core);
 672
 673         if (!evlist__sample_id_all(evlist))
 674                 return evlist__first(evlist);
 675
 676         return NULL;
 677 }
 678
 679 struct evsel *evlist__id2evsel_strict(struct evlist *evlist, u64 id)
 680 {
 681         struct perf_sample_id *sid;
 682
 683         if (!id)
 684                 return NULL;
 685
 686         sid = evlist__id2sid(evlist, id);
 687         if (sid)
 688                 return container_of(sid->evsel, struct evsel, core);
 689
 690         return NULL;
 691 }
 692
 693 static int evlist__event2id(struct evlist *evlist, union perf_event *event, u64 *id)
 694 {
 695         const __u64 *array = event->sample.array;
 696         ssize_t n;
 697
 698         n = (event->header.size - sizeof(event->header)) >> 3;
 699
 700         if (event->header.type == PERF_RECORD_SAMPLE) {
 701                 if (evlist->id_pos >= n)
 702                         return -1;
 703                 *id = array[evlist->id_pos];
 704         } else {
 705                 if (evlist->is_pos > n)
 706                         return -1;
 707                 n -= evlist->is_pos;
 708                 *id = array[n];
 709         }
 710         return 0;
 711 }
 712
 713 struct evsel *evlist__event2evsel(struct evlist *evlist, union perf_event *event)
 714 {
 715         struct evsel *first = evlist__first(evlist);
 716         struct hlist_head *head;
 717         struct perf_sample_id *sid;
 718         int hash;
 719         u64 id;
 720
 721         if (evlist->core.nr_entries == 1)
 722                 return first;
 723
 724         if (!first->core.attr.sample_id_all &&
 725             event->header.type != PERF_RECORD_SAMPLE)
 726                 return first;
 727
 728         if (evlist__event2id(evlist, event, &id))
 729                 return NULL;
 730
 731         /* Synthesized events have an id of zero */
 732         if (!id)
 733                 return first;
 734
 735         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 736         head = &evlist->core.heads[hash];
 737
 738         hlist_for_each_entry(sid, head, node) {
 739                 if (sid->id == id)
 740                         return container_of(sid->evsel, struct evsel, core);
 741         }
 742         return NULL;
 743 }
 744
 745 static int evlist__set_paused(struct evlist *evlist, bool value)
 746 {
 747         int i;
 748
 749         if (!evlist->overwrite_mmap)
 750                 return 0;
 751
 752         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 753                 int fd = evlist->overwrite_mmap[i].core.fd;
 754                 int err;
 755
 756                 if (fd < 0)
 757                         continue;
 758                 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
 759                 if (err)
 760                         return err;
 761         }
 762         return 0;
 763 }
 764
 765 static int evlist__pause(struct evlist *evlist)
 766 {
 767         return evlist__set_paused(evlist, true);
 768 }
 769
 770 static int evlist__resume(struct evlist *evlist)
 771 {
 772         return evlist__set_paused(evlist, false);
 773 }
 774
 775 static void evlist__munmap_nofree(struct evlist *evlist)
 776 {
 777         int i;
 778
 779         if (evlist->mmap)
 780                 for (i = 0; i < evlist->core.nr_mmaps; i++)
 781                         perf_mmap__munmap(&evlist->mmap[i].core);
 782
 783         if (evlist->overwrite_mmap)
 784                 for (i = 0; i < evlist->core.nr_mmaps; i++)
 785                         perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
 786 }
 787
 788 void evlist__munmap(struct evlist *evlist)
 789 {
 790         evlist__munmap_nofree(evlist);
 791         zfree(&evlist->mmap);
 792         zfree(&evlist->overwrite_mmap);
 793 }
 794
 795 static void perf_mmap__unmap_cb(struct perf_mmap *map)
 796 {
 797         struct mmap *m = container_of(map, struct mmap, core);
 798
 799         mmap__munmap(m);
 800 }
 801
 802 static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 803                                        bool overwrite)
 804 {
 805         int i;
 806         struct mmap *map;
 807
 808         map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
 809         if (!map)
 810                 return NULL;
 811
 812         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 813                 struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
 814
 815                 /*
 816                  * When the perf_mmap() call is made we grab one refcount, plus
 817                  * one extra to let perf_mmap__consume() get the last
 818                  * events after all real references (perf_mmap__get()) are
 819                  * dropped.
 820                  *
 821                  * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 822                  * thus does perf_mmap__get() on it.
 823                  */
 824                 perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
 825         }
 826
 827         return map;
 828 }
 829
 830 static void
 831 perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
 832                          struct perf_evsel *_evsel,
 833                          struct perf_mmap_param *_mp,
 834                          int idx)
 835 {
 836         struct evlist *evlist = container_of(_evlist, struct evlist, core);
 837         struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
 838         struct evsel *evsel = container_of(_evsel, struct evsel, core);
 839
 840         auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, evsel, idx);
 841 }
 842
 843 static struct perf_mmap*
 844 perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx)
 845 {
 846         struct evlist *evlist = container_of(_evlist, struct evlist, core);
 847         struct mmap *maps;
 848
 849         maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
 850
 851         if (!maps) {
 852                 maps = evlist__alloc_mmap(evlist, overwrite);
 853                 if (!maps)
 854                         return NULL;
 855
 856                 if (overwrite) {
 857                         evlist->overwrite_mmap = maps;
 858                         if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
 859                                 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 860                 } else {
 861                         evlist->mmap = maps;
 862                 }
 863         }
 864
 865         return &maps[idx].core;
 866 }
 867
 868 static int
 869 perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
 870                           int output, struct perf_cpu cpu)
 871 {
 872         struct mmap *map = container_of(_map, struct mmap, core);
 873         struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
 874
 875         return mmap__mmap(map, mp, output, cpu);
 876 }
 877
 878 unsigned long perf_event_mlock_kb_in_pages(void)
 879 {
 880         unsigned long pages;
 881         int max;
 882
 883         if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
 884                 /*
 885                  * Pick a once upon a time good value, i.e. things look
 886                  * strange since we can't read a sysctl value, but lets not
 887                  * die yet...
 888                  */
 889                 max = 512;
 890         } else {
 891                 max -= (page_size / 1024);
 892         }
 893
 894         pages = (max * 1024) / page_size;
 895         if (!is_power_of_2(pages))
 896                 pages = rounddown_pow_of_two(pages);
 897
 898         return pages;
 899 }
 900
 901 size_t evlist__mmap_size(unsigned long pages)
 902 {
 903         if (pages == UINT_MAX)
 904                 pages = perf_event_mlock_kb_in_pages();
 905         else if (!is_power_of_2(pages))
 906                 return 0;
 907
 908         return (pages + 1) * page_size;
 909 }
 910
 911 static long parse_pages_arg(const char *str, unsigned long min,
 912                             unsigned long max)
 913 {
 914         unsigned long pages, val;
 915         static struct parse_tag tags[] = {
 916                 { .tag  = 'B', .mult = 1       },
 917                 { .tag  = 'K', .mult = 1 << 10 },
 918                 { .tag  = 'M', .mult = 1 << 20 },
 919                 { .tag  = 'G', .mult = 1 << 30 },
 920                 { .tag  = 0 },
 921         };
 922
 923         if (str == NULL)
 924                 return -EINVAL;
 925
 926         val = parse_tag_value(str, tags);
 927         if (val != (unsigned long) -1) {
 928                 /* we got file size value */
 929                 pages = PERF_ALIGN(val, page_size) / page_size;
 930         } else {
 931                 /* we got pages count value */
 932                 char *eptr;
 933                 pages = strtoul(str, &eptr, 10);
 934                 if (*eptr != '\0')
 935                         return -EINVAL;
 936         }
 937
 938         if (pages == 0 && min == 0) {
 939                 /* leave number of pages at 0 */
 940         } else if (!is_power_of_2(pages)) {
 941                 char buf[100];
 942
 943                 /* round pages up to next power of 2 */
 944                 pages = roundup_pow_of_two(pages);
 945                 if (!pages)
 946                         return -EINVAL;
 947
 948                 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
 949                 pr_info("rounding mmap pages size to %s (%lu pages)\n",
 950                         buf, pages);
 951         }
 952
 953         if (pages > max)
 954                 return -EINVAL;
 955
 956         return pages;
 957 }
 958
 959 int __evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
 960 {
 961         unsigned long max = UINT_MAX;
 962         long pages;
 963
 964         if (max > SIZE_MAX / page_size)
 965                 max = SIZE_MAX / page_size;
 966
 967         pages = parse_pages_arg(str, 1, max);
 968         if (pages < 0) {
 969                 pr_err("Invalid argument for --mmap_pages/-m\n");
 970                 return -1;
 971         }
 972
 973         *mmap_pages = pages;
 974         return 0;
 975 }
 976
 977 int evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset __maybe_unused)
 978 {
 979         return __evlist__parse_mmap_pages(opt->value, str);
 980 }
 981
 982 /**
 983  * evlist__mmap_ex - Create mmaps to receive events.
 984  * @evlist: list of events
 985  * @pages: map length in pages
 986  * @overwrite: overwrite older events?
 987  * @auxtrace_pages - auxtrace map length in pages
 988  * @auxtrace_overwrite - overwrite older auxtrace data?
 989  *
 990  * If @overwrite is %false the user needs to signal event consumption using
 991  * perf_mmap__write_tail().  Using evlist__mmap_read() does this
 992  * automatically.
 993  *
 994  * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
 995  * consumption using auxtrace_mmap__write_tail().
 996  *
 997  * Return: %0 on success, negative error code otherwise.
 998  */
 999 int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
1000                          unsigned int auxtrace_pages,
1001                          bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
1002                          int comp_level)
1003 {
1004         /*
1005          * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1006          * Its value is decided by evsel's write_backward.
1007          * So &mp should not be passed through const pointer.
1008          */
1009         struct mmap_params mp = {
1010                 .nr_cblocks     = nr_cblocks,
1011                 .affinity       = affinity,
1012                 .flush          = flush,
1013                 .comp_level     = comp_level
1014         };
1015         struct perf_evlist_mmap_ops ops = {
1016                 .idx  = perf_evlist__mmap_cb_idx,
1017                 .get  = perf_evlist__mmap_cb_get,
1018                 .mmap = perf_evlist__mmap_cb_mmap,
1019         };
1020
1021         evlist->core.mmap_len = evlist__mmap_size(pages);
1022         pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
1023
1024         auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
1025                                    auxtrace_pages, auxtrace_overwrite);
1026
1027         return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
1028 }
1029
1030 int evlist__mmap(struct evlist *evlist, unsigned int pages)
1031 {
1032         return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
1033 }
1034
1035 int evlist__create_maps(struct evlist *evlist, struct target *target)
1036 {
1037         bool all_threads = (target->per_thread && target->system_wide);
1038         struct perf_cpu_map *cpus;
1039         struct perf_thread_map *threads;
1040
1041         /*
1042          * If specify '-a' and '--per-thread' to perf record, perf record
1043          * will override '--per-thread'. target->per_thread = false and
1044          * target->system_wide = true.
1045          *
1046          * If specify '--per-thread' only to perf record,
1047          * target->per_thread = true and target->system_wide = false.
1048          *
1049          * So target->per_thread && target->system_wide is false.
1050          * For perf record, thread_map__new_str doesn't call
1051          * thread_map__new_all_cpus. That will keep perf record's
1052          * current behavior.
1053          *
1054          * For perf stat, it allows the case that target->per_thread and
1055          * target->system_wide are all true. It means to collect system-wide
1056          * per-thread data. thread_map__new_str will call
1057          * thread_map__new_all_cpus to enumerate all threads.
1058          */
1059         threads = thread_map__new_str(target->pid, target->tid, target->uid,
1060                                       all_threads);
1061
1062         if (!threads)
1063                 return -1;
1064
1065         if (target__uses_dummy_map(target))
1066                 cpus = perf_cpu_map__new_any_cpu();
1067         else
1068                 cpus = perf_cpu_map__new(target->cpu_list);
1069
1070         if (!cpus)
1071                 goto out_delete_threads;
1072
1073         evlist->core.has_user_cpus = !!target->cpu_list;
1074
1075         perf_evlist__set_maps(&evlist->core, cpus, threads);
1076
1077         /* as evlist now has references, put count here */
1078         perf_cpu_map__put(cpus);
1079         perf_thread_map__put(threads);
1080
1081         return 0;
1082
1083 out_delete_threads:
1084         perf_thread_map__put(threads);
1085         return -1;
1086 }
1087
1088 int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
1089 {
1090         struct evsel *evsel;
1091         int err = 0;
1092
1093         evlist__for_each_entry(evlist, evsel) {
1094                 /*
1095                  * filters only work for tracepoint event, which doesn't have cpu limit.
1096                  * So evlist and evsel should always be same.
1097                  */
1098                 if (evsel->filter) {
1099                         err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
1100                         if (err) {
1101                                 *err_evsel = evsel;
1102                                 break;
1103                         }
1104                 }
1105
1106                 /*
1107                  * non-tracepoint events can have BPF filters.
1108                  */
1109                 if (!list_empty(&evsel->bpf_filters)) {
1110                         err = perf_bpf_filter__prepare(evsel);
1111                         if (err) {
1112                                 *err_evsel = evsel;
1113                                 break;
1114                         }
1115                 }
1116         }
1117
1118         return err;
1119 }
1120
1121 int evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1122 {
1123         struct evsel *evsel;
1124         int err = 0;
1125
1126         if (filter == NULL)
1127                 return -1;
1128
1129         evlist__for_each_entry(evlist, evsel) {
1130                 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1131                         continue;
1132
1133                 err = evsel__set_filter(evsel, filter);
1134                 if (err)
1135                         break;
1136         }
1137
1138         return err;
1139 }
1140
1141 int evlist__append_tp_filter(struct evlist *evlist, const char *filter)
1142 {
1143         struct evsel *evsel;
1144         int err = 0;
1145
1146         if (filter == NULL)
1147                 return -1;
1148
1149         evlist__for_each_entry(evlist, evsel) {
1150                 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1151                         continue;
1152
1153                 err = evsel__append_tp_filter(evsel, filter);
1154                 if (err)
1155                         break;
1156         }
1157
1158         return err;
1159 }
1160
1161 char *asprintf__tp_filter_pids(size_t npids, pid_t *pids)
1162 {
1163         char *filter;
1164         size_t i;
1165
1166         for (i = 0; i < npids; ++i) {
1167                 if (i == 0) {
1168                         if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1169                                 return NULL;
1170                 } else {
1171                         char *tmp;
1172
1173                         if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1174                                 goto out_free;
1175
1176                         free(filter);
1177                         filter = tmp;
1178                 }
1179         }
1180
1181         return filter;
1182 out_free:
1183         free(filter);
1184         return NULL;
1185 }
1186
1187 int evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1188 {
1189         char *filter = asprintf__tp_filter_pids(npids, pids);
1190         int ret = evlist__set_tp_filter(evlist, filter);
1191
1192         free(filter);
1193         return ret;
1194 }
1195
1196 int evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
1197 {
1198         return evlist__set_tp_filter_pids(evlist, 1, &pid);
1199 }
1200
1201 int evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1202 {
1203         char *filter = asprintf__tp_filter_pids(npids, pids);
1204         int ret = evlist__append_tp_filter(evlist, filter);
1205
1206         free(filter);
1207         return ret;
1208 }
1209
1210 int evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
1211 {
1212         return evlist__append_tp_filter_pids(evlist, 1, &pid);
1213 }
1214
1215 bool evlist__valid_sample_type(struct evlist *evlist)
1216 {
1217         struct evsel *pos;
1218
1219         if (evlist->core.nr_entries == 1)
1220                 return true;
1221
1222         if (evlist->id_pos < 0 || evlist->is_pos < 0)
1223                 return false;
1224
1225         evlist__for_each_entry(evlist, pos) {
1226                 if (pos->id_pos != evlist->id_pos ||
1227                     pos->is_pos != evlist->is_pos)
1228                         return false;
1229         }
1230
1231         return true;
1232 }
1233
1234 u64 __evlist__combined_sample_type(struct evlist *evlist)
1235 {
1236         struct evsel *evsel;
1237
1238         if (evlist->combined_sample_type)
1239                 return evlist->combined_sample_type;
1240
1241         evlist__for_each_entry(evlist, evsel)
1242                 evlist->combined_sample_type |= evsel->core.attr.sample_type;
1243
1244         return evlist->combined_sample_type;
1245 }
1246
1247 u64 evlist__combined_sample_type(struct evlist *evlist)
1248 {
1249         evlist->combined_sample_type = 0;
1250         return __evlist__combined_sample_type(evlist);
1251 }
1252
1253 u64 evlist__combined_branch_type(struct evlist *evlist)
1254 {
1255         struct evsel *evsel;
1256         u64 branch_type = 0;
1257
1258         evlist__for_each_entry(evlist, evsel)
1259                 branch_type |= evsel->core.attr.branch_sample_type;
1260         return branch_type;
1261 }
1262
1263 bool evlist__valid_read_format(struct evlist *evlist)
1264 {
1265         struct evsel *first = evlist__first(evlist), *pos = first;
1266         u64 read_format = first->core.attr.read_format;
1267         u64 sample_type = first->core.attr.sample_type;
1268
1269         evlist__for_each_entry(evlist, pos) {
1270                 if (read_format != pos->core.attr.read_format) {
1271                         pr_debug("Read format differs %#" PRIx64 " vs %#" PRIx64 "\n",
1272                                  read_format, (u64)pos->core.attr.read_format);
1273                 }
1274         }
1275
1276         /* PERF_SAMPLE_READ implies PERF_FORMAT_ID. */
1277         if ((sample_type & PERF_SAMPLE_READ) &&
1278             !(read_format & PERF_FORMAT_ID)) {
1279                 return false;
1280         }
1281
1282         return true;
1283 }
1284
1285 u16 evlist__id_hdr_size(struct evlist *evlist)
1286 {
1287         struct evsel *first = evlist__first(evlist);
1288
1289         return first->core.attr.sample_id_all ? evsel__id_hdr_size(first) : 0;
1290 }
1291
1292 bool evlist__valid_sample_id_all(struct evlist *evlist)
1293 {
1294         struct evsel *first = evlist__first(evlist), *pos = first;
1295
1296         evlist__for_each_entry_continue(evlist, pos) {
1297                 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1298                         return false;
1299         }
1300
1301         return true;
1302 }
1303
1304 bool evlist__sample_id_all(struct evlist *evlist)
1305 {
1306         struct evsel *first = evlist__first(evlist);
1307         return first->core.attr.sample_id_all;
1308 }
1309
1310 void evlist__set_selected(struct evlist *evlist, struct evsel *evsel)
1311 {
1312         evlist->selected = evsel;
1313 }
1314
1315 void evlist__close(struct evlist *evlist)
1316 {
1317         struct evsel *evsel;
1318         struct evlist_cpu_iterator evlist_cpu_itr;
1319         struct affinity affinity;
1320
1321         /*
1322          * With perf record core.user_requested_cpus is usually NULL.
1323          * Use the old method to handle this for now.
1324          */
1325         if (!evlist->core.user_requested_cpus ||
1326             cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
1327                 evlist__for_each_entry_reverse(evlist, evsel)
1328                         evsel__close(evsel);
1329                 return;
1330         }
1331
1332         if (affinity__setup(&affinity) < 0)
1333                 return;
1334
1335         evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) {
1336                 perf_evsel__close_cpu(&evlist_cpu_itr.evsel->core,
1337                                       evlist_cpu_itr.cpu_map_idx);
1338         }
1339
1340         affinity__cleanup(&affinity);
1341         evlist__for_each_entry_reverse(evlist, evsel) {
1342                 perf_evsel__free_fd(&evsel->core);
1343                 perf_evsel__free_id(&evsel->core);
1344         }
1345         perf_evlist__reset_id_hash(&evlist->core);
1346 }
1347
1348 static int evlist__create_syswide_maps(struct evlist *evlist)
1349 {
1350         struct perf_cpu_map *cpus;
1351         struct perf_thread_map *threads;
1352
1353         /*
1354          * Try reading /sys/devices/system/cpu/online to get
1355          * an all cpus map.
1356          *
1357          * FIXME: -ENOMEM is the best we can do here, the cpu_map
1358          * code needs an overhaul to properly forward the
1359          * error, and we may not want to do that fallback to a
1360          * default cpu identity map :-\
1361          */
1362         cpus = perf_cpu_map__new_online_cpus();
1363         if (!cpus)
1364                 goto out;
1365
1366         threads = perf_thread_map__new_dummy();
1367         if (!threads)
1368                 goto out_put;
1369
1370         perf_evlist__set_maps(&evlist->core, cpus, threads);
1371
1372         perf_thread_map__put(threads);
1373 out_put:
1374         perf_cpu_map__put(cpus);
1375 out:
1376         return -ENOMEM;
1377 }
1378
1379 int evlist__open(struct evlist *evlist)
1380 {
1381         struct evsel *evsel;
1382         int err;
1383
1384         /*
1385          * Default: one fd per CPU, all threads, aka systemwide
1386          * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1387          */
1388         if (evlist->core.threads == NULL && evlist->core.user_requested_cpus == NULL) {
1389                 err = evlist__create_syswide_maps(evlist);
1390                 if (err < 0)
1391                         goto out_err;
1392         }
1393
1394         evlist__update_id_pos(evlist);
1395
1396         evlist__for_each_entry(evlist, evsel) {
1397                 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1398                 if (err < 0)
1399                         goto out_err;
1400         }
1401
1402         return 0;
1403 out_err:
1404         evlist__close(evlist);
1405         errno = -err;
1406         return err;
1407 }
1408
1409 int evlist__prepare_workload(struct evlist *evlist, struct target *target, const char *argv[],
1410                              bool pipe_output, void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1411 {
1412         int child_ready_pipe[2], go_pipe[2];
1413         char bf;
1414
1415         if (pipe(child_ready_pipe) < 0) {
1416                 perror("failed to create 'ready' pipe");
1417                 return -1;
1418         }
1419
1420         if (pipe(go_pipe) < 0) {
1421                 perror("failed to create 'go' pipe");
1422                 goto out_close_ready_pipe;
1423         }
1424
1425         evlist->workload.pid = fork();
1426         if (evlist->workload.pid < 0) {
1427                 perror("failed to fork");
1428                 goto out_close_pipes;
1429         }
1430
1431         if (!evlist->workload.pid) {
1432                 int ret;
1433
1434                 if (pipe_output)
1435                         dup2(2, 1);
1436
1437                 signal(SIGTERM, SIG_DFL);
1438
1439                 close(child_ready_pipe[0]);
1440                 close(go_pipe[1]);
1441                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1442
1443                 /*
1444                  * Change the name of this process not to confuse --exclude-perf users
1445                  * that sees 'perf' in the window up to the execvp() and thinks that
1446                  * perf samples are not being excluded.
1447                  */
1448                 prctl(PR_SET_NAME, "perf-exec");
1449
1450                 /*
1451                  * Tell the parent we're ready to go
1452                  */
1453                 close(child_ready_pipe[1]);
1454
1455                 /*
1456                  * Wait until the parent tells us to go.
1457                  */
1458                 ret = read(go_pipe[0], &bf, 1);
1459                 /*
1460                  * The parent will ask for the execvp() to be performed by
1461                  * writing exactly one byte, in workload.cork_fd, usually via
1462                  * evlist__start_workload().
1463                  *
1464                  * For cancelling the workload without actually running it,
1465                  * the parent will just close workload.cork_fd, without writing
1466                  * anything, i.e. read will return zero and we just exit()
1467                  * here.
1468                  */
1469                 if (ret != 1) {
1470                         if (ret == -1)
1471                                 perror("unable to read pipe");
1472                         exit(ret);
1473                 }
1474
1475                 execvp(argv[0], (char **)argv);
1476
1477                 if (exec_error) {
1478                         union sigval val;
1479
1480                         val.sival_int = errno;
1481                         if (sigqueue(getppid(), SIGUSR1, val))
1482                                 perror(argv[0]);
1483                 } else
1484                         perror(argv[0]);
1485                 exit(-1);
1486         }
1487
1488         if (exec_error) {
1489                 struct sigaction act = {
1490                         .sa_flags     = SA_SIGINFO,
1491                         .sa_sigaction = exec_error,
1492                 };
1493                 sigaction(SIGUSR1, &act, NULL);
1494         }
1495
1496         if (target__none(target)) {
1497                 if (evlist->core.threads == NULL) {
1498                         fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1499                                 __func__, __LINE__);
1500                         goto out_close_pipes;
1501                 }
1502                 perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1503         }
1504
1505         close(child_ready_pipe[1]);
1506         close(go_pipe[0]);
1507         /*
1508          * wait for child to settle
1509          */
1510         if (read(child_ready_pipe[0], &bf, 1) == -1) {
1511                 perror("unable to read pipe");
1512                 goto out_close_pipes;
1513         }
1514
1515         fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1516         evlist->workload.cork_fd = go_pipe[1];
1517         close(child_ready_pipe[0]);
1518         return 0;
1519
1520 out_close_pipes:
1521         close(go_pipe[0]);
1522         close(go_pipe[1]);
1523 out_close_ready_pipe:
1524         close(child_ready_pipe[0]);
1525         close(child_ready_pipe[1]);
1526         return -1;
1527 }
1528
1529 int evlist__start_workload(struct evlist *evlist)
1530 {
1531         if (evlist->workload.cork_fd > 0) {
1532                 char bf = 0;
1533                 int ret;
1534                 /*
1535                  * Remove the cork, let it rip!
1536                  */
1537                 ret = write(evlist->workload.cork_fd, &bf, 1);
1538                 if (ret < 0)
1539                         perror("unable to write to pipe");
1540
1541                 close(evlist->workload.cork_fd);
1542                 return ret;
1543         }
1544
1545         return 0;
1546 }
1547
1548 int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
1549 {
1550         struct evsel *evsel = evlist__event2evsel(evlist, event);
1551         int ret;
1552
1553         if (!evsel)
1554                 return -EFAULT;
1555         ret = evsel__parse_sample(evsel, event, sample);
1556         if (ret)
1557                 return ret;
1558         if (perf_guest && sample->id) {
1559                 struct perf_sample_id *sid = evlist__id2sid(evlist, sample->id);
1560
1561                 if (sid) {
1562                         sample->machine_pid = sid->machine_pid;
1563                         sample->vcpu = sid->vcpu.cpu;
1564                 }
1565         }
1566         return 0;
1567 }
1568
1569 int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp)
1570 {
1571         struct evsel *evsel = evlist__event2evsel(evlist, event);
1572
1573         if (!evsel)
1574                 return -EFAULT;
1575         return evsel__parse_sample_timestamp(evsel, event, timestamp);
1576 }
1577
1578 int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
1579 {
1580         int printed, value;
1581         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1582
1583         switch (err) {
1584         case EACCES:
1585         case EPERM:
1586                 printed = scnprintf(buf, size,
1587                                     "Error:\t%s.\n"
1588                                     "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1589
1590                 value = perf_event_paranoid();
1591
1592                 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1593
1594                 if (value >= 2) {
1595                         printed += scnprintf(buf + printed, size - printed,
1596                                              "For your workloads it needs to be <= 1\nHint:\t");
1597                 }
1598                 printed += scnprintf(buf + printed, size - printed,
1599                                      "For system wide tracing it needs to be set to -1.\n");
1600
1601                 printed += scnprintf(buf + printed, size - printed,
1602                                     "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1603                                     "Hint:\tThe current value is %d.", value);
1604                 break;
1605         case EINVAL: {
1606                 struct evsel *first = evlist__first(evlist);
1607                 int max_freq;
1608
1609                 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1610                         goto out_default;
1611
1612                 if (first->core.attr.sample_freq < (u64)max_freq)
1613                         goto out_default;
1614
1615                 printed = scnprintf(buf, size,
1616                                     "Error:\t%s.\n"
1617                                     "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1618                                     "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1619                                     emsg, max_freq, first->core.attr.sample_freq);
1620                 break;
1621         }
1622         default:
1623 out_default:
1624                 scnprintf(buf, size, "%s", emsg);
1625                 break;
1626         }
1627
1628         return 0;
1629 }
1630
1631 int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1632 {
1633         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1634         int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1635
1636         switch (err) {
1637         case EPERM:
1638                 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1639                 printed += scnprintf(buf + printed, size - printed,
1640                                      "Error:\t%s.\n"
1641                                      "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1642                                      "Hint:\tTried using %zd kB.\n",
1643                                      emsg, pages_max_per_user, pages_attempted);
1644
1645                 if (pages_attempted >= pages_max_per_user) {
1646                         printed += scnprintf(buf + printed, size - printed,
1647                                              "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1648                                              pages_max_per_user + pages_attempted);
1649                 }
1650
1651                 printed += scnprintf(buf + printed, size - printed,
1652                                      "Hint:\tTry using a smaller -m/--mmap-pages value.");
1653                 break;
1654         default:
1655                 scnprintf(buf, size, "%s", emsg);
1656                 break;
1657         }
1658
1659         return 0;
1660 }
1661
1662 void evlist__to_front(struct evlist *evlist, struct evsel *move_evsel)
1663 {
1664         struct evsel *evsel, *n;
1665         LIST_HEAD(move);
1666
1667         if (move_evsel == evlist__first(evlist))
1668                 return;
1669
1670         evlist__for_each_entry_safe(evlist, n, evsel) {
1671                 if (evsel__leader(evsel) == evsel__leader(move_evsel))
1672                         list_move_tail(&evsel->core.node, &move);
1673         }
1674
1675         list_splice(&move, &evlist->core.entries);
1676 }
1677
1678 struct evsel *evlist__get_tracking_event(struct evlist *evlist)
1679 {
1680         struct evsel *evsel;
1681
1682         evlist__for_each_entry(evlist, evsel) {
1683                 if (evsel->tracking)
1684                         return evsel;
1685         }
1686
1687         return evlist__first(evlist);
1688 }
1689
1690 void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_evsel)
1691 {
1692         struct evsel *evsel;
1693
1694         if (tracking_evsel->tracking)
1695                 return;
1696
1697         evlist__for_each_entry(evlist, evsel) {
1698                 if (evsel != tracking_evsel)
1699                         evsel->tracking = false;
1700         }
1701
1702         tracking_evsel->tracking = true;
1703 }
1704
1705 struct evsel *evlist__findnew_tracking_event(struct evlist *evlist, bool system_wide)
1706 {
1707         struct evsel *evsel;
1708
1709         evsel = evlist__get_tracking_event(evlist);
1710         if (!evsel__is_dummy_event(evsel)) {
1711                 evsel = evlist__add_aux_dummy(evlist, system_wide);
1712                 if (!evsel)
1713                         return NULL;
1714
1715                 evlist__set_tracking_event(evlist, evsel);
1716         } else if (system_wide) {
1717                 perf_evlist__go_system_wide(&evlist->core, &evsel->core);
1718         }
1719
1720         return evsel;
1721 }
1722
1723 struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str)
1724 {
1725         struct evsel *evsel;
1726
1727         evlist__for_each_entry(evlist, evsel) {
1728                 if (!evsel->name)
1729                         continue;
1730                 if (evsel__name_is(evsel, str))
1731                         return evsel;
1732         }
1733
1734         return NULL;
1735 }
1736
1737 void evlist__toggle_bkw_mmap(struct evlist *evlist, enum bkw_mmap_state state)
1738 {
1739         enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1740         enum action {
1741                 NONE,
1742                 PAUSE,
1743                 RESUME,
1744         } action = NONE;
1745
1746         if (!evlist->overwrite_mmap)
1747                 return;
1748
1749         switch (old_state) {
1750         case BKW_MMAP_NOTREADY: {
1751                 if (state != BKW_MMAP_RUNNING)
1752                         goto state_err;
1753                 break;
1754         }
1755         case BKW_MMAP_RUNNING: {
1756                 if (state != BKW_MMAP_DATA_PENDING)
1757                         goto state_err;
1758                 action = PAUSE;
1759                 break;
1760         }
1761         case BKW_MMAP_DATA_PENDING: {
1762                 if (state != BKW_MMAP_EMPTY)
1763                         goto state_err;
1764                 break;
1765         }
1766         case BKW_MMAP_EMPTY: {
1767                 if (state != BKW_MMAP_RUNNING)
1768                         goto state_err;
1769                 action = RESUME;
1770                 break;
1771         }
1772         default:
1773                 WARN_ONCE(1, "Shouldn't get there\n");
1774         }
1775
1776         evlist->bkw_mmap_state = state;
1777
1778         switch (action) {
1779         case PAUSE:
1780                 evlist__pause(evlist);
1781                 break;
1782         case RESUME:
1783                 evlist__resume(evlist);
1784                 break;
1785         case NONE:
1786         default:
1787                 break;
1788         }
1789
1790 state_err:
1791         return;
1792 }
1793
1794 bool evlist__exclude_kernel(struct evlist *evlist)
1795 {
1796         struct evsel *evsel;
1797
1798         evlist__for_each_entry(evlist, evsel) {
1799                 if (!evsel->core.attr.exclude_kernel)
1800                         return false;
1801         }
1802
1803         return true;
1804 }
1805
1806 /*
1807  * Events in data file are not collect in groups, but we still want
1808  * the group display. Set the artificial group and set the leader's
1809  * forced_leader flag to notify the display code.
1810  */
1811 void evlist__force_leader(struct evlist *evlist)
1812 {
1813         if (evlist__nr_groups(evlist) == 0) {
1814                 struct evsel *leader = evlist__first(evlist);
1815
1816                 evlist__set_leader(evlist);
1817                 leader->forced_leader = true;
1818         }
1819 }
1820
1821 struct evsel *evlist__reset_weak_group(struct evlist *evsel_list, struct evsel *evsel, bool close)
1822 {
1823         struct evsel *c2, *leader;
1824         bool is_open = true;
1825
1826         leader = evsel__leader(evsel);
1827
1828         pr_debug("Weak group for %s/%d failed\n",
1829                         leader->name, leader->core.nr_members);
1830
1831         /*
1832          * for_each_group_member doesn't work here because it doesn't
1833          * include the first entry.
1834          */
1835         evlist__for_each_entry(evsel_list, c2) {
1836                 if (c2 == evsel)
1837                         is_open = false;
1838                 if (evsel__has_leader(c2, leader)) {
1839                         if (is_open && close)
1840                                 perf_evsel__close(&c2->core);
1841                         /*
1842                          * We want to close all members of the group and reopen
1843                          * them. Some events, like Intel topdown, require being
1844                          * in a group and so keep these in the group.
1845                          */
1846                         evsel__remove_from_group(c2, leader);
1847
1848                         /*
1849                          * Set this for all former members of the group
1850                          * to indicate they get reopened.
1851                          */
1852                         c2->reset_group = true;
1853                 }
1854         }
1855         /* Reset the leader count if all entries were removed. */
1856         if (leader->core.nr_members == 1)
1857                 leader->core.nr_members = 0;
1858         return leader;
1859 }
1860
1861 static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1862 {
1863         char *s, *p;
1864         int ret = 0, fd;
1865
1866         if (strncmp(str, "fifo:", 5))
1867                 return -EINVAL;
1868
1869         str += 5;
1870         if (!*str || *str == ',')
1871                 return -EINVAL;
1872
1873         s = strdup(str);
1874         if (!s)
1875                 return -ENOMEM;
1876
1877         p = strchr(s, ',');
1878         if (p)
1879                 *p = '\0';
1880
1881         /*
1882          * O_RDWR avoids POLLHUPs which is necessary to allow the other
1883          * end of a FIFO to be repeatedly opened and closed.
1884          */
1885         fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1886         if (fd < 0) {
1887                 pr_err("Failed to open '%s'\n", s);
1888                 ret = -errno;
1889                 goto out_free;
1890         }
1891         *ctl_fd = fd;
1892         *ctl_fd_close = true;
1893
1894         if (p && *++p) {
1895                 /* O_RDWR | O_NONBLOCK means the other end need not be open */
1896                 fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1897                 if (fd < 0) {
1898                         pr_err("Failed to open '%s'\n", p);
1899                         ret = -errno;
1900                         goto out_free;
1901                 }
1902                 *ctl_fd_ack = fd;
1903         }
1904
1905 out_free:
1906         free(s);
1907         return ret;
1908 }
1909
1910 int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1911 {
1912         char *comma = NULL, *endptr = NULL;
1913
1914         *ctl_fd_close = false;
1915
1916         if (strncmp(str, "fd:", 3))
1917                 return evlist__parse_control_fifo(str, ctl_fd, ctl_fd_ack, ctl_fd_close);
1918
1919         *ctl_fd = strtoul(&str[3], &endptr, 0);
1920         if (endptr == &str[3])
1921                 return -EINVAL;
1922
1923         comma = strchr(str, ',');
1924         if (comma) {
1925                 if (endptr != comma)
1926                         return -EINVAL;
1927
1928                 *ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
1929                 if (endptr == comma + 1 || *endptr != '\0')
1930                         return -EINVAL;
1931         }
1932
1933         return 0;
1934 }
1935
1936 void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close)
1937 {
1938         if (*ctl_fd_close) {
1939                 *ctl_fd_close = false;
1940                 close(ctl_fd);
1941                 if (ctl_fd_ack >= 0)
1942                         close(ctl_fd_ack);
1943         }
1944 }
1945
1946 int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
1947 {
1948         if (fd == -1) {
1949                 pr_debug("Control descriptor is not initialized\n");
1950                 return 0;
1951         }
1952
1953         evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
1954                                                      fdarray_flag__nonfilterable |
1955                                                      fdarray_flag__non_perf_event);
1956         if (evlist->ctl_fd.pos < 0) {
1957                 evlist->ctl_fd.pos = -1;
1958                 pr_err("Failed to add ctl fd entry: %m\n");
1959                 return -1;
1960         }
1961
1962         evlist->ctl_fd.fd = fd;
1963         evlist->ctl_fd.ack = ack;
1964
1965         return 0;
1966 }
1967
1968 bool evlist__ctlfd_initialized(struct evlist *evlist)
1969 {
1970         return evlist->ctl_fd.pos >= 0;
1971 }
1972
1973 int evlist__finalize_ctlfd(struct evlist *evlist)
1974 {
1975         struct pollfd *entries = evlist->core.pollfd.entries;
1976
1977         if (!evlist__ctlfd_initialized(evlist))
1978                 return 0;
1979
1980         entries[evlist->ctl_fd.pos].fd = -1;
1981         entries[evlist->ctl_fd.pos].events = 0;
1982         entries[evlist->ctl_fd.pos].revents = 0;
1983
1984         evlist->ctl_fd.pos = -1;
1985         evlist->ctl_fd.ack = -1;
1986         evlist->ctl_fd.fd = -1;
1987
1988         return 0;
1989 }
1990
1991 static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
1992                               char *cmd_data, size_t data_size)
1993 {
1994         int err;
1995         char c;
1996         size_t bytes_read = 0;
1997
1998         *cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1999         memset(cmd_data, 0, data_size);
2000         data_size--;
2001
2002         do {
2003                 err = read(evlist->ctl_fd.fd, &c, 1);
2004                 if (err > 0) {
2005                         if (c == '\n' || c == '\0')
2006                                 break;
2007                         cmd_data[bytes_read++] = c;
2008                         if (bytes_read == data_size)
2009                                 break;
2010                         continue;
2011                 } else if (err == -1) {
2012                         if (errno == EINTR)
2013                                 continue;
2014                         if (errno == EAGAIN || errno == EWOULDBLOCK)
2015                                 err = 0;
2016                         else
2017                                 pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
2018                 }
2019                 break;
2020         } while (1);
2021
2022         pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
2023                  bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
2024
2025         if (bytes_read > 0) {
2026                 if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
2027                              (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
2028                         *cmd = EVLIST_CTL_CMD_ENABLE;
2029                 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
2030                                     (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) {
2031                         *cmd = EVLIST_CTL_CMD_DISABLE;
2032                 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_SNAPSHOT_TAG,
2033                                     (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
2034                         *cmd = EVLIST_CTL_CMD_SNAPSHOT;
2035                         pr_debug("is snapshot\n");
2036                 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG,
2037                                     (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) {
2038                         *cmd = EVLIST_CTL_CMD_EVLIST;
2039                 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG,
2040                                     (sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) {
2041                         *cmd = EVLIST_CTL_CMD_STOP;
2042                 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_PING_TAG,
2043                                     (sizeof(EVLIST_CTL_CMD_PING_TAG)-1))) {
2044                         *cmd = EVLIST_CTL_CMD_PING;
2045                 }
2046         }
2047
2048         return bytes_read ? (int)bytes_read : err;
2049 }
2050
2051 int evlist__ctlfd_ack(struct evlist *evlist)
2052 {
2053         int err;
2054
2055         if (evlist->ctl_fd.ack == -1)
2056                 return 0;
2057
2058         err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG,
2059                     sizeof(EVLIST_CTL_CMD_ACK_TAG));
2060         if (err == -1)
2061                 pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack);
2062
2063         return err;
2064 }
2065
2066 static int get_cmd_arg(char *cmd_data, size_t cmd_size, char **arg)
2067 {
2068         char *data = cmd_data + cmd_size;
2069
2070         /* no argument */
2071         if (!*data)
2072                 return 0;
2073
2074         /* there's argument */
2075         if (*data == ' ') {
2076                 *arg = data + 1;
2077                 return 1;
2078         }
2079
2080         /* malformed */
2081         return -1;
2082 }
2083
2084 static int evlist__ctlfd_enable(struct evlist *evlist, char *cmd_data, bool enable)
2085 {
2086         struct evsel *evsel;
2087         char *name;
2088         int err;
2089
2090         err = get_cmd_arg(cmd_data,
2091                           enable ? sizeof(EVLIST_CTL_CMD_ENABLE_TAG) - 1 :
2092                                    sizeof(EVLIST_CTL_CMD_DISABLE_TAG) - 1,
2093                           &name);
2094         if (err < 0) {
2095                 pr_info("failed: wrong command\n");
2096                 return -1;
2097         }
2098
2099         if (err) {
2100                 evsel = evlist__find_evsel_by_str(evlist, name);
2101                 if (evsel) {
2102                         if (enable)
2103                                 evlist__enable_evsel(evlist, name);
2104                         else
2105                                 evlist__disable_evsel(evlist, name);
2106                         pr_info("Event %s %s\n", evsel->name,
2107                                 enable ? "enabled" : "disabled");
2108                 } else {
2109                         pr_info("failed: can't find '%s' event\n", name);
2110                 }
2111         } else {
2112                 if (enable) {
2113                         evlist__enable(evlist);
2114                         pr_info(EVLIST_ENABLED_MSG);
2115                 } else {
2116                         evlist__disable(evlist);
2117                         pr_info(EVLIST_DISABLED_MSG);
2118                 }
2119         }
2120
2121         return 0;
2122 }
2123
2124 static int evlist__ctlfd_list(struct evlist *evlist, char *cmd_data)
2125 {
2126         struct perf_attr_details details = { .verbose = false, };
2127         struct evsel *evsel;
2128         char *arg;
2129         int err;
2130
2131         err = get_cmd_arg(cmd_data,
2132                           sizeof(EVLIST_CTL_CMD_EVLIST_TAG) - 1,
2133                           &arg);
2134         if (err < 0) {
2135                 pr_info("failed: wrong command\n");
2136                 return -1;
2137         }
2138
2139         if (err) {
2140                 if (!strcmp(arg, "-v")) {
2141                         details.verbose = true;
2142                 } else if (!strcmp(arg, "-g")) {
2143                         details.event_group = true;
2144                 } else if (!strcmp(arg, "-F")) {
2145                         details.freq = true;
2146                 } else {
2147                         pr_info("failed: wrong command\n");
2148                         return -1;
2149                 }
2150         }
2151
2152         evlist__for_each_entry(evlist, evsel)
2153                 evsel__fprintf(evsel, &details, stderr);
2154
2155         return 0;
2156 }
2157
2158 int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
2159 {
2160         int err = 0;
2161         char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
2162         int ctlfd_pos = evlist->ctl_fd.pos;
2163         struct pollfd *entries = evlist->core.pollfd.entries;
2164
2165         if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
2166                 return 0;
2167
2168         if (entries[ctlfd_pos].revents & POLLIN) {
2169                 err = evlist__ctlfd_recv(evlist, cmd, cmd_data,
2170                                          EVLIST_CTL_CMD_MAX_LEN);
2171                 if (err > 0) {
2172                         switch (*cmd) {
2173                         case EVLIST_CTL_CMD_ENABLE:
2174                         case EVLIST_CTL_CMD_DISABLE:
2175                                 err = evlist__ctlfd_enable(evlist, cmd_data,
2176                                                            *cmd == EVLIST_CTL_CMD_ENABLE);
2177                                 break;
2178                         case EVLIST_CTL_CMD_EVLIST:
2179                                 err = evlist__ctlfd_list(evlist, cmd_data);
2180                                 break;
2181                         case EVLIST_CTL_CMD_SNAPSHOT:
2182                         case EVLIST_CTL_CMD_STOP:
2183                         case EVLIST_CTL_CMD_PING:
2184                                 break;
2185                         case EVLIST_CTL_CMD_ACK:
2186                         case EVLIST_CTL_CMD_UNSUPPORTED:
2187                         default:
2188                                 pr_debug("ctlfd: unsupported %d\n", *cmd);
2189                                 break;
2190                         }
2191                         if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED ||
2192                               *cmd == EVLIST_CTL_CMD_SNAPSHOT))
2193                                 evlist__ctlfd_ack(evlist);
2194                 }
2195         }
2196
2197         if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR))
2198                 evlist__finalize_ctlfd(evlist);
2199         else
2200                 entries[ctlfd_pos].revents = 0;
2201
2202         return err;
2203 }
2204
2205 /**
2206  * struct event_enable_time - perf record -D/--delay single time range.
2207  * @start: start of time range to enable events in milliseconds
2208  * @end: end of time range to enable events in milliseconds
2209  *
2210  * N.B. this structure is also accessed as an array of int.
2211  */
2212 struct event_enable_time {
2213         int     start;
2214         int     end;
2215 };
2216
2217 static int parse_event_enable_time(const char *str, struct event_enable_time *range, bool first)
2218 {
2219         const char *fmt = first ? "%u - %u %n" : " , %u - %u %n";
2220         int ret, start, end, n;
2221
2222         ret = sscanf(str, fmt, &start, &end, &n);
2223         if (ret != 2 || end <= start)
2224                 return -EINVAL;
2225         if (range) {
2226                 range->start = start;
2227                 range->end = end;
2228         }
2229         return n;
2230 }
2231
2232 static ssize_t parse_event_enable_times(const char *str, struct event_enable_time *range)
2233 {
2234         int incr = !!range;
2235         bool first = true;
2236         ssize_t ret, cnt;
2237
2238         for (cnt = 0; *str; cnt++) {
2239                 ret = parse_event_enable_time(str, range, first);
2240                 if (ret < 0)
2241                         return ret;
2242                 /* Check no overlap */
2243                 if (!first && range && range->start <= range[-1].end)
2244                         return -EINVAL;
2245                 str += ret;
2246                 range += incr;
2247                 first = false;
2248         }
2249         return cnt;
2250 }
2251
2252 /**
2253  * struct event_enable_timer - control structure for perf record -D/--delay.
2254  * @evlist: event list
2255  * @times: time ranges that events are enabled (N.B. this is also accessed as an
2256  *         array of int)
2257  * @times_cnt: number of time ranges
2258  * @timerfd: timer file descriptor
2259  * @pollfd_pos: position in @evlist array of file descriptors to poll (fdarray)
2260  * @times_step: current position in (int *)@times)[],
2261  *              refer event_enable_timer__process()
2262  *
2263  * Note, this structure is only used when there are time ranges, not when there
2264  * is only an initial delay.
2265  */
2266 struct event_enable_timer {
2267         struct evlist *evlist;
2268         struct event_enable_time *times;
2269         size_t  times_cnt;
2270         int     timerfd;
2271         int     pollfd_pos;
2272         size_t  times_step;
2273 };
2274
2275 static int str_to_delay(const char *str)
2276 {
2277         char *endptr;
2278         long d;
2279
2280         d = strtol(str, &endptr, 10);
2281         if (*endptr || d > INT_MAX || d < -1)
2282                 return 0;
2283         return d;
2284 }
2285
2286 int evlist__parse_event_enable_time(struct evlist *evlist, struct record_opts *opts,
2287                                     const char *str, int unset)
2288 {
2289         enum fdarray_flags flags = fdarray_flag__nonfilterable | fdarray_flag__non_perf_event;
2290         struct event_enable_timer *eet;
2291         ssize_t times_cnt;
2292         ssize_t ret;
2293         int err;
2294
2295         if (unset)
2296                 return 0;
2297
2298         opts->target.initial_delay = str_to_delay(str);
2299         if (opts->target.initial_delay)
2300                 return 0;
2301
2302         ret = parse_event_enable_times(str, NULL);
2303         if (ret < 0)
2304                 return ret;
2305
2306         times_cnt = ret;
2307         if (times_cnt == 0)
2308                 return -EINVAL;
2309
2310         eet = zalloc(sizeof(*eet));
2311         if (!eet)
2312                 return -ENOMEM;
2313
2314         eet->times = calloc(times_cnt, sizeof(*eet->times));
2315         if (!eet->times) {
2316                 err = -ENOMEM;
2317                 goto free_eet;
2318         }
2319
2320         if (parse_event_enable_times(str, eet->times) != times_cnt) {
2321                 err = -EINVAL;
2322                 goto free_eet_times;
2323         }
2324
2325         eet->times_cnt = times_cnt;
2326
2327         eet->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
2328         if (eet->timerfd == -1) {
2329                 err = -errno;
2330                 pr_err("timerfd_create failed: %s\n", strerror(errno));
2331                 goto free_eet_times;
2332         }
2333
2334         eet->pollfd_pos = perf_evlist__add_pollfd(&evlist->core, eet->timerfd, NULL, POLLIN, flags);
2335         if (eet->pollfd_pos < 0) {
2336                 err = eet->pollfd_pos;
2337                 goto close_timerfd;
2338         }
2339
2340         eet->evlist = evlist;
2341         evlist->eet = eet;
2342         opts->target.initial_delay = eet->times[0].start;
2343
2344         return 0;
2345
2346 close_timerfd:
2347         close(eet->timerfd);
2348 free_eet_times:
2349         zfree(&eet->times);
2350 free_eet:
2351         free(eet);
2352         return err;
2353 }
2354
2355 static int event_enable_timer__set_timer(struct event_enable_timer *eet, int ms)
2356 {
2357         struct itimerspec its = {
2358                 .it_value.tv_sec = ms / MSEC_PER_SEC,
2359                 .it_value.tv_nsec = (ms % MSEC_PER_SEC) * NSEC_PER_MSEC,
2360         };
2361         int err = 0;
2362
2363         if (timerfd_settime(eet->timerfd, 0, &its, NULL) < 0) {
2364                 err = -errno;
2365                 pr_err("timerfd_settime failed: %s\n", strerror(errno));
2366         }
2367         return err;
2368 }
2369
2370 int event_enable_timer__start(struct event_enable_timer *eet)
2371 {
2372         int ms;
2373
2374         if (!eet)
2375                 return 0;
2376
2377         ms = eet->times[0].end - eet->times[0].start;
2378         eet->times_step = 1;
2379
2380         return event_enable_timer__set_timer(eet, ms);
2381 }
2382
2383 int event_enable_timer__process(struct event_enable_timer *eet)
2384 {
2385         struct pollfd *entries;
2386         short revents;
2387
2388         if (!eet)
2389                 return 0;
2390
2391         entries = eet->evlist->core.pollfd.entries;
2392         revents = entries[eet->pollfd_pos].revents;
2393         entries[eet->pollfd_pos].revents = 0;
2394
2395         if (revents & POLLIN) {
2396                 size_t step = eet->times_step;
2397                 size_t pos = step / 2;
2398
2399                 if (step & 1) {
2400                         evlist__disable_non_dummy(eet->evlist);
2401                         pr_info(EVLIST_DISABLED_MSG);
2402                         if (pos >= eet->times_cnt - 1) {
2403                                 /* Disarm timer */
2404                                 event_enable_timer__set_timer(eet, 0);
2405                                 return 1; /* Stop */
2406                         }
2407                 } else {
2408                         evlist__enable_non_dummy(eet->evlist);
2409                         pr_info(EVLIST_ENABLED_MSG);
2410                 }
2411
2412                 step += 1;
2413                 pos = step / 2;
2414
2415                 if (pos < eet->times_cnt) {
2416                         int *times = (int *)eet->times; /* Accessing 'times' as array of int */
2417                         int ms = times[step] - times[step - 1];
2418
2419                         eet->times_step = step;
2420                         return event_enable_timer__set_timer(eet, ms);
2421                 }
2422         }
2423
2424         return 0;
2425 }
2426
2427 void event_enable_timer__exit(struct event_enable_timer **ep)
2428 {
2429         if (!ep || !*ep)
2430                 return;
2431         zfree(&(*ep)->times);
2432         zfree(ep);
2433 }
2434
2435 struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
2436 {
2437         struct evsel *evsel;
2438
2439         evlist__for_each_entry(evlist, evsel) {
2440                 if (evsel->core.idx == idx)
2441                         return evsel;
2442         }
2443         return NULL;
2444 }
2445
2446 int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf)
2447 {
2448         struct evsel *evsel;
2449         int printed = 0;
2450
2451         evlist__for_each_entry(evlist, evsel) {
2452                 if (evsel__is_dummy_event(evsel))
2453                         continue;
2454                 if (size > (strlen(evsel__name(evsel)) + (printed ? 2 : 1))) {
2455                         printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "," : "", evsel__name(evsel));
2456                 } else {
2457                         printed += scnprintf(bf + printed, size - printed, "%s...", printed ? "," : "");
2458                         break;
2459                 }
2460         }
2461
2462         return printed;
2463 }
2464
2465 void evlist__check_mem_load_aux(struct evlist *evlist)
2466 {
2467         struct evsel *leader, *evsel, *pos;
2468
2469         /*
2470          * For some platforms, the 'mem-loads' event is required to use
2471          * together with 'mem-loads-aux' within a group and 'mem-loads-aux'
2472          * must be the group leader. Now we disable this group before reporting
2473          * because 'mem-loads-aux' is just an auxiliary event. It doesn't carry
2474          * any valid memory load information.
2475          */
2476         evlist__for_each_entry(evlist, evsel) {
2477                 leader = evsel__leader(evsel);
2478                 if (leader == evsel)
2479                         continue;
2480
2481                 if (leader->name && strstr(leader->name, "mem-loads-aux")) {
2482                         for_each_group_evsel(pos, leader) {
2483                                 evsel__set_leader(pos, pos);
2484                                 pos->core.nr_members = 0;
2485                         }
2486                 }
2487         }
2488 }
2489
2490 /**
2491  * evlist__warn_user_requested_cpus() - Check each evsel against requested CPUs
2492  *     and warn if the user CPU list is inapplicable for the event's PMU's
2493  *     CPUs. Not core PMUs list a CPU in sysfs, but this may be overwritten by a
2494  *     user requested CPU and so any online CPU is applicable. Core PMUs handle
2495  *     events on the CPUs in their list and otherwise the event isn't supported.
2496  * @evlist: The list of events being checked.
2497  * @cpu_list: The user provided list of CPUs.
2498  */
2499 void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_list)
2500 {
2501         struct perf_cpu_map *user_requested_cpus;
2502         struct evsel *pos;
2503
2504         if (!cpu_list)
2505                 return;
2506
2507         user_requested_cpus = perf_cpu_map__new(cpu_list);
2508         if (!user_requested_cpus)
2509                 return;
2510
2511         evlist__for_each_entry(evlist, pos) {
2512                 struct perf_cpu_map *intersect, *to_test;
2513                 const struct perf_pmu *pmu = evsel__find_pmu(pos);
2514
2515                 to_test = pmu && pmu->is_core ? pmu->cpus : cpu_map__online();
2516                 intersect = perf_cpu_map__intersect(to_test, user_requested_cpus);
2517                 if (!perf_cpu_map__equal(intersect, user_requested_cpus)) {
2518                         char buf[128];
2519
2520                         cpu_map__snprint(to_test, buf, sizeof(buf));
2521                         pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n",
2522                                 cpu_list, pmu ? pmu->name : "cpu", buf, evsel__name(pos));
2523                 }
2524                 perf_cpu_map__put(intersect);
2525         }
2526         perf_cpu_map__put(user_requested_cpus);
2527 }
2528
2529 void evlist__uniquify_name(struct evlist *evlist)
2530 {
2531         char *new_name, empty_attributes[2] = ":", *attributes;
2532         struct evsel *pos;
2533
2534         if (perf_pmus__num_core_pmus() == 1)
2535                 return;
2536
2537         evlist__for_each_entry(evlist, pos) {
2538                 if (!evsel__is_hybrid(pos))
2539                         continue;
2540
2541                 if (strchr(pos->name, '/'))
2542                         continue;
2543
2544                 attributes = strchr(pos->name, ':');
2545                 if (attributes)
2546                         *attributes = '\0';
2547                 else
2548                         attributes = empty_attributes;
2549
2550                 if (asprintf(&new_name, "%s/%s/%s", pos->pmu_name, pos->name, attributes + 1)) {
2551                         free(pos->name);
2552                         pos->name = new_name;
2553                 } else {
2554                         *attributes = ':';
2555                 }
2556         }
2557 }