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