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 <signal.h>
  28 #include <unistd.h>
  29 #include <sched.h>
  30 #include <stdlib.h>
  31
  32 #include "parse-events.h"
  33 #include <subcmd/parse-options.h>
  34
  35 #include <fcntl.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/mman.h>
  38
  39 #include <linux/bitops.h>
  40 #include <linux/hash.h>
  41 #include <linux/log2.h>
  42 #include <linux/err.h>
  43 #include <linux/string.h>
  44 #include <linux/zalloc.h>
  45 #include <perf/evlist.h>
  46 #include <perf/evsel.h>
  47 #include <perf/cpumap.h>
  48 #include <perf/mmap.h>
  49
  50 #include <internal/xyarray.h>
  51
  52 #ifdef LACKS_SIGQUEUE_PROTOTYPE
  53 int sigqueue(pid_t pid, int sig, const union sigval value);
  54 #endif
  55
  56 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
  57 #define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
  58
  59 void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
  60                   struct perf_thread_map *threads)
  61 {
  62         perf_evlist__init(&evlist->core);
  63         perf_evlist__set_maps(&evlist->core, cpus, threads);
  64         evlist->workload.pid = -1;
  65         evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
  66         evlist->ctl_fd.fd = -1;
  67         evlist->ctl_fd.ack = -1;
  68         evlist->ctl_fd.pos = -1;
  69 }
  70
  71 struct evlist *evlist__new(void)
  72 {
  73         struct evlist *evlist = zalloc(sizeof(*evlist));
  74
  75         if (evlist != NULL)
  76                 evlist__init(evlist, NULL, NULL);
  77
  78         return evlist;
  79 }
  80
  81 struct evlist *perf_evlist__new_default(void)
  82 {
  83         struct evlist *evlist = evlist__new();
  84
  85         if (evlist && evlist__add_default(evlist)) {
  86                 evlist__delete(evlist);
  87                 evlist = NULL;
  88         }
  89
  90         return evlist;
  91 }
  92
  93 struct evlist *perf_evlist__new_dummy(void)
  94 {
  95         struct evlist *evlist = evlist__new();
  96
  97         if (evlist && evlist__add_dummy(evlist)) {
  98                 evlist__delete(evlist);
  99                 evlist = NULL;
 100         }
 101
 102         return evlist;
 103 }
 104
 105 /**
 106  * perf_evlist__set_id_pos - set the positions of event ids.
 107  * @evlist: selected event list
 108  *
 109  * Events with compatible sample types all have the same id_pos
 110  * and is_pos.  For convenience, put a copy on evlist.
 111  */
 112 void perf_evlist__set_id_pos(struct evlist *evlist)
 113 {
 114         struct evsel *first = evlist__first(evlist);
 115
 116         evlist->id_pos = first->id_pos;
 117         evlist->is_pos = first->is_pos;
 118 }
 119
 120 static void perf_evlist__update_id_pos(struct evlist *evlist)
 121 {
 122         struct evsel *evsel;
 123
 124         evlist__for_each_entry(evlist, evsel)
 125                 evsel__calc_id_pos(evsel);
 126
 127         perf_evlist__set_id_pos(evlist);
 128 }
 129
 130 static void evlist__purge(struct evlist *evlist)
 131 {
 132         struct evsel *pos, *n;
 133
 134         evlist__for_each_entry_safe(evlist, n, pos) {
 135                 list_del_init(&pos->core.node);
 136                 pos->evlist = NULL;
 137                 evsel__delete(pos);
 138         }
 139
 140         evlist->core.nr_entries = 0;
 141 }
 142
 143 void evlist__exit(struct evlist *evlist)
 144 {
 145         zfree(&evlist->mmap);
 146         zfree(&evlist->overwrite_mmap);
 147         perf_evlist__exit(&evlist->core);
 148 }
 149
 150 void evlist__delete(struct evlist *evlist)
 151 {
 152         if (evlist == NULL)
 153                 return;
 154
 155         evlist__munmap(evlist);
 156         evlist__close(evlist);
 157         evlist__purge(evlist);
 158         evlist__exit(evlist);
 159         free(evlist);
 160 }
 161
 162 void evlist__add(struct evlist *evlist, struct evsel *entry)
 163 {
 164         entry->evlist = evlist;
 165         entry->idx = evlist->core.nr_entries;
 166         entry->tracking = !entry->idx;
 167
 168         perf_evlist__add(&evlist->core, &entry->core);
 169
 170         if (evlist->core.nr_entries == 1)
 171                 perf_evlist__set_id_pos(evlist);
 172 }
 173
 174 void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 175 {
 176         evsel->evlist = NULL;
 177         perf_evlist__remove(&evlist->core, &evsel->core);
 178 }
 179
 180 void perf_evlist__splice_list_tail(struct evlist *evlist,
 181                                    struct list_head *list)
 182 {
 183         struct evsel *evsel, *temp;
 184
 185         __evlist__for_each_entry_safe(list, temp, evsel) {
 186                 list_del_init(&evsel->core.node);
 187                 evlist__add(evlist, evsel);
 188         }
 189 }
 190
 191 int __evlist__set_tracepoints_handlers(struct evlist *evlist,
 192                                        const struct evsel_str_handler *assocs, size_t nr_assocs)
 193 {
 194         struct evsel *evsel;
 195         size_t i;
 196         int err;
 197
 198         for (i = 0; i < nr_assocs; i++) {
 199                 // Adding a handler for an event not in this evlist, just ignore it.
 200                 evsel = perf_evlist__find_tracepoint_by_name(evlist, assocs[i].name);
 201                 if (evsel == NULL)
 202                         continue;
 203
 204                 err = -EEXIST;
 205                 if (evsel->handler != NULL)
 206                         goto out;
 207                 evsel->handler = assocs[i].handler;
 208         }
 209
 210         err = 0;
 211 out:
 212         return err;
 213 }
 214
 215 void __perf_evlist__set_leader(struct list_head *list)
 216 {
 217         struct evsel *evsel, *leader;
 218
 219         leader = list_entry(list->next, struct evsel, core.node);
 220         evsel = list_entry(list->prev, struct evsel, core.node);
 221
 222         leader->core.nr_members = evsel->idx - leader->idx + 1;
 223
 224         __evlist__for_each_entry(list, evsel) {
 225                 evsel->leader = leader;
 226         }
 227 }
 228
 229 void perf_evlist__set_leader(struct evlist *evlist)
 230 {
 231         if (evlist->core.nr_entries) {
 232                 evlist->nr_groups = evlist->core.nr_entries > 1 ? 1 : 0;
 233                 __perf_evlist__set_leader(&evlist->core.entries);
 234         }
 235 }
 236
 237 int __evlist__add_default(struct evlist *evlist, bool precise)
 238 {
 239         struct evsel *evsel = evsel__new_cycles(precise);
 240
 241         if (evsel == NULL)
 242                 return -ENOMEM;
 243
 244         evlist__add(evlist, evsel);
 245         return 0;
 246 }
 247
 248 int evlist__add_dummy(struct evlist *evlist)
 249 {
 250         struct perf_event_attr attr = {
 251                 .type   = PERF_TYPE_SOFTWARE,
 252                 .config = PERF_COUNT_SW_DUMMY,
 253                 .size   = sizeof(attr), /* to capture ABI version */
 254         };
 255         struct evsel *evsel = evsel__new_idx(&attr, evlist->core.nr_entries);
 256
 257         if (evsel == NULL)
 258                 return -ENOMEM;
 259
 260         evlist__add(evlist, evsel);
 261         return 0;
 262 }
 263
 264 static int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
 265 {
 266         struct evsel *evsel, *n;
 267         LIST_HEAD(head);
 268         size_t i;
 269
 270         for (i = 0; i < nr_attrs; i++) {
 271                 evsel = evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
 272                 if (evsel == NULL)
 273                         goto out_delete_partial_list;
 274                 list_add_tail(&evsel->core.node, &head);
 275         }
 276
 277         perf_evlist__splice_list_tail(evlist, &head);
 278
 279         return 0;
 280
 281 out_delete_partial_list:
 282         __evlist__for_each_entry_safe(&head, n, evsel)
 283                 evsel__delete(evsel);
 284         return -1;
 285 }
 286
 287 int __evlist__add_default_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
 288 {
 289         size_t i;
 290
 291         for (i = 0; i < nr_attrs; i++)
 292                 event_attr_init(attrs + i);
 293
 294         return evlist__add_attrs(evlist, attrs, nr_attrs);
 295 }
 296
 297 struct evsel *
 298 perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
 299 {
 300         struct evsel *evsel;
 301
 302         evlist__for_each_entry(evlist, evsel) {
 303                 if (evsel->core.attr.type   == PERF_TYPE_TRACEPOINT &&
 304                     (int)evsel->core.attr.config == id)
 305                         return evsel;
 306         }
 307
 308         return NULL;
 309 }
 310
 311 struct evsel *
 312 perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
 313                                      const char *name)
 314 {
 315         struct evsel *evsel;
 316
 317         evlist__for_each_entry(evlist, evsel) {
 318                 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
 319                     (strcmp(evsel->name, name) == 0))
 320                         return evsel;
 321         }
 322
 323         return NULL;
 324 }
 325
 326 int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler)
 327 {
 328         struct evsel *evsel = evsel__newtp(sys, name);
 329
 330         if (IS_ERR(evsel))
 331                 return -1;
 332
 333         evsel->handler = handler;
 334         evlist__add(evlist, evsel);
 335         return 0;
 336 }
 337
 338 static int perf_evlist__nr_threads(struct evlist *evlist,
 339                                    struct evsel *evsel)
 340 {
 341         if (evsel->core.system_wide)
 342                 return 1;
 343         else
 344                 return perf_thread_map__nr(evlist->core.threads);
 345 }
 346
 347 void evlist__cpu_iter_start(struct evlist *evlist)
 348 {
 349         struct evsel *pos;
 350
 351         /*
 352          * Reset the per evsel cpu_iter. This is needed because
 353          * each evsel's cpumap may have a different index space,
 354          * and some operations need the index to modify
 355          * the FD xyarray (e.g. open, close)
 356          */
 357         evlist__for_each_entry(evlist, pos)
 358                 pos->cpu_iter = 0;
 359 }
 360
 361 bool evsel__cpu_iter_skip_no_inc(struct evsel *ev, int cpu)
 362 {
 363         if (ev->cpu_iter >= ev->core.cpus->nr)
 364                 return true;
 365         if (cpu >= 0 && ev->core.cpus->map[ev->cpu_iter] != cpu)
 366                 return true;
 367         return false;
 368 }
 369
 370 bool evsel__cpu_iter_skip(struct evsel *ev, int cpu)
 371 {
 372         if (!evsel__cpu_iter_skip_no_inc(ev, cpu)) {
 373                 ev->cpu_iter++;
 374                 return false;
 375         }
 376         return true;
 377 }
 378
 379 void evlist__disable(struct evlist *evlist)
 380 {
 381         struct evsel *pos;
 382         struct affinity affinity;
 383         int cpu, i, imm = 0;
 384         bool has_imm = false;
 385
 386         if (affinity__setup(&affinity) < 0)
 387                 return;
 388
 389         /* Disable 'immediate' events last */
 390         for (imm = 0; imm <= 1; imm++) {
 391                 evlist__for_each_cpu(evlist, i, cpu) {
 392                         affinity__set(&affinity, cpu);
 393
 394                         evlist__for_each_entry(evlist, pos) {
 395                                 if (evsel__cpu_iter_skip(pos, cpu))
 396                                         continue;
 397                                 if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
 398                                         continue;
 399                                 if (pos->immediate)
 400                                         has_imm = true;
 401                                 if (pos->immediate != imm)
 402                                         continue;
 403                                 evsel__disable_cpu(pos, pos->cpu_iter - 1);
 404                         }
 405                 }
 406                 if (!has_imm)
 407                         break;
 408         }
 409
 410         affinity__cleanup(&affinity);
 411         evlist__for_each_entry(evlist, pos) {
 412                 if (!evsel__is_group_leader(pos) || !pos->core.fd)
 413                         continue;
 414                 pos->disabled = true;
 415         }
 416
 417         evlist->enabled = false;
 418 }
 419
 420 void evlist__enable(struct evlist *evlist)
 421 {
 422         struct evsel *pos;
 423         struct affinity affinity;
 424         int cpu, i;
 425
 426         if (affinity__setup(&affinity) < 0)
 427                 return;
 428
 429         evlist__for_each_cpu(evlist, i, cpu) {
 430                 affinity__set(&affinity, cpu);
 431
 432                 evlist__for_each_entry(evlist, pos) {
 433                         if (evsel__cpu_iter_skip(pos, cpu))
 434                                 continue;
 435                         if (!evsel__is_group_leader(pos) || !pos->core.fd)
 436                                 continue;
 437                         evsel__enable_cpu(pos, pos->cpu_iter - 1);
 438                 }
 439         }
 440         affinity__cleanup(&affinity);
 441         evlist__for_each_entry(evlist, pos) {
 442                 if (!evsel__is_group_leader(pos) || !pos->core.fd)
 443                         continue;
 444                 pos->disabled = false;
 445         }
 446
 447         evlist->enabled = true;
 448 }
 449
 450 void perf_evlist__toggle_enable(struct evlist *evlist)
 451 {
 452         (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
 453 }
 454
 455 static int perf_evlist__enable_event_cpu(struct evlist *evlist,
 456                                          struct evsel *evsel, int cpu)
 457 {
 458         int thread;
 459         int nr_threads = perf_evlist__nr_threads(evlist, evsel);
 460
 461         if (!evsel->core.fd)
 462                 return -EINVAL;
 463
 464         for (thread = 0; thread < nr_threads; thread++) {
 465                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 466                 if (err)
 467                         return err;
 468         }
 469         return 0;
 470 }
 471
 472 static int perf_evlist__enable_event_thread(struct evlist *evlist,
 473                                             struct evsel *evsel,
 474                                             int thread)
 475 {
 476         int cpu;
 477         int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
 478
 479         if (!evsel->core.fd)
 480                 return -EINVAL;
 481
 482         for (cpu = 0; cpu < nr_cpus; cpu++) {
 483                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
 484                 if (err)
 485                         return err;
 486         }
 487         return 0;
 488 }
 489
 490 int perf_evlist__enable_event_idx(struct evlist *evlist,
 491                                   struct evsel *evsel, int idx)
 492 {
 493         bool per_cpu_mmaps = !perf_cpu_map__empty(evlist->core.cpus);
 494
 495         if (per_cpu_mmaps)
 496                 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
 497         else
 498                 return perf_evlist__enable_event_thread(evlist, evsel, idx);
 499 }
 500
 501 int evlist__add_pollfd(struct evlist *evlist, int fd)
 502 {
 503         return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default);
 504 }
 505
 506 int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
 507 {
 508         return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask);
 509 }
 510
 511 #ifdef HAVE_EVENTFD_SUPPORT
 512 int evlist__add_wakeup_eventfd(struct evlist *evlist, int fd)
 513 {
 514         return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
 515                                        fdarray_flag__nonfilterable);
 516 }
 517 #endif
 518
 519 int evlist__poll(struct evlist *evlist, int timeout)
 520 {
 521         return perf_evlist__poll(&evlist->core, timeout);
 522 }
 523
 524 struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id)
 525 {
 526         struct hlist_head *head;
 527         struct perf_sample_id *sid;
 528         int hash;
 529
 530         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 531         head = &evlist->core.heads[hash];
 532
 533         hlist_for_each_entry(sid, head, node)
 534                 if (sid->id == id)
 535                         return sid;
 536
 537         return NULL;
 538 }
 539
 540 struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
 541 {
 542         struct perf_sample_id *sid;
 543
 544         if (evlist->core.nr_entries == 1 || !id)
 545                 return evlist__first(evlist);
 546
 547         sid = perf_evlist__id2sid(evlist, id);
 548         if (sid)
 549                 return container_of(sid->evsel, struct evsel, core);
 550
 551         if (!evlist__sample_id_all(evlist))
 552                 return evlist__first(evlist);
 553
 554         return NULL;
 555 }
 556
 557 struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
 558                                                 u64 id)
 559 {
 560         struct perf_sample_id *sid;
 561
 562         if (!id)
 563                 return NULL;
 564
 565         sid = perf_evlist__id2sid(evlist, id);
 566         if (sid)
 567                 return container_of(sid->evsel, struct evsel, core);
 568
 569         return NULL;
 570 }
 571
 572 static int perf_evlist__event2id(struct evlist *evlist,
 573                                  union perf_event *event, u64 *id)
 574 {
 575         const __u64 *array = event->sample.array;
 576         ssize_t n;
 577
 578         n = (event->header.size - sizeof(event->header)) >> 3;
 579
 580         if (event->header.type == PERF_RECORD_SAMPLE) {
 581                 if (evlist->id_pos >= n)
 582                         return -1;
 583                 *id = array[evlist->id_pos];
 584         } else {
 585                 if (evlist->is_pos > n)
 586                         return -1;
 587                 n -= evlist->is_pos;
 588                 *id = array[n];
 589         }
 590         return 0;
 591 }
 592
 593 struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
 594                                             union perf_event *event)
 595 {
 596         struct evsel *first = evlist__first(evlist);
 597         struct hlist_head *head;
 598         struct perf_sample_id *sid;
 599         int hash;
 600         u64 id;
 601
 602         if (evlist->core.nr_entries == 1)
 603                 return first;
 604
 605         if (!first->core.attr.sample_id_all &&
 606             event->header.type != PERF_RECORD_SAMPLE)
 607                 return first;
 608
 609         if (perf_evlist__event2id(evlist, event, &id))
 610                 return NULL;
 611
 612         /* Synthesized events have an id of zero */
 613         if (!id)
 614                 return first;
 615
 616         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 617         head = &evlist->core.heads[hash];
 618
 619         hlist_for_each_entry(sid, head, node) {
 620                 if (sid->id == id)
 621                         return container_of(sid->evsel, struct evsel, core);
 622         }
 623         return NULL;
 624 }
 625
 626 static int perf_evlist__set_paused(struct evlist *evlist, bool value)
 627 {
 628         int i;
 629
 630         if (!evlist->overwrite_mmap)
 631                 return 0;
 632
 633         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 634                 int fd = evlist->overwrite_mmap[i].core.fd;
 635                 int err;
 636
 637                 if (fd < 0)
 638                         continue;
 639                 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
 640                 if (err)
 641                         return err;
 642         }
 643         return 0;
 644 }
 645
 646 static int perf_evlist__pause(struct evlist *evlist)
 647 {
 648         return perf_evlist__set_paused(evlist, true);
 649 }
 650
 651 static int perf_evlist__resume(struct evlist *evlist)
 652 {
 653         return perf_evlist__set_paused(evlist, false);
 654 }
 655
 656 static void evlist__munmap_nofree(struct evlist *evlist)
 657 {
 658         int i;
 659
 660         if (evlist->mmap)
 661                 for (i = 0; i < evlist->core.nr_mmaps; i++)
 662                         perf_mmap__munmap(&evlist->mmap[i].core);
 663
 664         if (evlist->overwrite_mmap)
 665                 for (i = 0; i < evlist->core.nr_mmaps; i++)
 666                         perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
 667 }
 668
 669 void evlist__munmap(struct evlist *evlist)
 670 {
 671         evlist__munmap_nofree(evlist);
 672         zfree(&evlist->mmap);
 673         zfree(&evlist->overwrite_mmap);
 674 }
 675
 676 static void perf_mmap__unmap_cb(struct perf_mmap *map)
 677 {
 678         struct mmap *m = container_of(map, struct mmap, core);
 679
 680         mmap__munmap(m);
 681 }
 682
 683 static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 684                                        bool overwrite)
 685 {
 686         int i;
 687         struct mmap *map;
 688
 689         map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
 690         if (!map)
 691                 return NULL;
 692
 693         for (i = 0; i < evlist->core.nr_mmaps; i++) {
 694                 struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
 695
 696                 /*
 697                  * When the perf_mmap() call is made we grab one refcount, plus
 698                  * one extra to let perf_mmap__consume() get the last
 699                  * events after all real references (perf_mmap__get()) are
 700                  * dropped.
 701                  *
 702                  * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 703                  * thus does perf_mmap__get() on it.
 704                  */
 705                 perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
 706         }
 707
 708         return map;
 709 }
 710
 711 static void
 712 perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
 713                          struct perf_mmap_param *_mp,
 714                          int idx, bool per_cpu)
 715 {
 716         struct evlist *evlist = container_of(_evlist, struct evlist, core);
 717         struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
 718
 719         auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, idx, per_cpu);
 720 }
 721
 722 static struct perf_mmap*
 723 perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx)
 724 {
 725         struct evlist *evlist = container_of(_evlist, struct evlist, core);
 726         struct mmap *maps;
 727
 728         maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
 729
 730         if (!maps) {
 731                 maps = evlist__alloc_mmap(evlist, overwrite);
 732                 if (!maps)
 733                         return NULL;
 734
 735                 if (overwrite) {
 736                         evlist->overwrite_mmap = maps;
 737                         if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
 738                                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 739                 } else {
 740                         evlist->mmap = maps;
 741                 }
 742         }
 743
 744         return &maps[idx].core;
 745 }
 746
 747 static int
 748 perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
 749                           int output, int cpu)
 750 {
 751         struct mmap *map = container_of(_map, struct mmap, core);
 752         struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
 753
 754         return mmap__mmap(map, mp, output, cpu);
 755 }
 756
 757 unsigned long perf_event_mlock_kb_in_pages(void)
 758 {
 759         unsigned long pages;
 760         int max;
 761
 762         if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
 763                 /*
 764                  * Pick a once upon a time good value, i.e. things look
 765                  * strange since we can't read a sysctl value, but lets not
 766                  * die yet...
 767                  */
 768                 max = 512;
 769         } else {
 770                 max -= (page_size / 1024);
 771         }
 772
 773         pages = (max * 1024) / page_size;
 774         if (!is_power_of_2(pages))
 775                 pages = rounddown_pow_of_two(pages);
 776
 777         return pages;
 778 }
 779
 780 size_t evlist__mmap_size(unsigned long pages)
 781 {
 782         if (pages == UINT_MAX)
 783                 pages = perf_event_mlock_kb_in_pages();
 784         else if (!is_power_of_2(pages))
 785                 return 0;
 786
 787         return (pages + 1) * page_size;
 788 }
 789
 790 static long parse_pages_arg(const char *str, unsigned long min,
 791                             unsigned long max)
 792 {
 793         unsigned long pages, val;
 794         static struct parse_tag tags[] = {
 795                 { .tag  = 'B', .mult = 1       },
 796                 { .tag  = 'K', .mult = 1 << 10 },
 797                 { .tag  = 'M', .mult = 1 << 20 },
 798                 { .tag  = 'G', .mult = 1 << 30 },
 799                 { .tag  = 0 },
 800         };
 801
 802         if (str == NULL)
 803                 return -EINVAL;
 804
 805         val = parse_tag_value(str, tags);
 806         if (val != (unsigned long) -1) {
 807                 /* we got file size value */
 808                 pages = PERF_ALIGN(val, page_size) / page_size;
 809         } else {
 810                 /* we got pages count value */
 811                 char *eptr;
 812                 pages = strtoul(str, &eptr, 10);
 813                 if (*eptr != '\0')
 814                         return -EINVAL;
 815         }
 816
 817         if (pages == 0 && min == 0) {
 818                 /* leave number of pages at 0 */
 819         } else if (!is_power_of_2(pages)) {
 820                 char buf[100];
 821
 822                 /* round pages up to next power of 2 */
 823                 pages = roundup_pow_of_two(pages);
 824                 if (!pages)
 825                         return -EINVAL;
 826
 827                 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
 828                 pr_info("rounding mmap pages size to %s (%lu pages)\n",
 829                         buf, pages);
 830         }
 831
 832         if (pages > max)
 833                 return -EINVAL;
 834
 835         return pages;
 836 }
 837
 838 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
 839 {
 840         unsigned long max = UINT_MAX;
 841         long pages;
 842
 843         if (max > SIZE_MAX / page_size)
 844                 max = SIZE_MAX / page_size;
 845
 846         pages = parse_pages_arg(str, 1, max);
 847         if (pages < 0) {
 848                 pr_err("Invalid argument for --mmap_pages/-m\n");
 849                 return -1;
 850         }
 851
 852         *mmap_pages = pages;
 853         return 0;
 854 }
 855
 856 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
 857                                   int unset __maybe_unused)
 858 {
 859         return __perf_evlist__parse_mmap_pages(opt->value, str);
 860 }
 861
 862 /**
 863  * evlist__mmap_ex - Create mmaps to receive events.
 864  * @evlist: list of events
 865  * @pages: map length in pages
 866  * @overwrite: overwrite older events?
 867  * @auxtrace_pages - auxtrace map length in pages
 868  * @auxtrace_overwrite - overwrite older auxtrace data?
 869  *
 870  * If @overwrite is %false the user needs to signal event consumption using
 871  * perf_mmap__write_tail().  Using evlist__mmap_read() does this
 872  * automatically.
 873  *
 874  * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
 875  * consumption using auxtrace_mmap__write_tail().
 876  *
 877  * Return: %0 on success, negative error code otherwise.
 878  */
 879 int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
 880                          unsigned int auxtrace_pages,
 881                          bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
 882                          int comp_level)
 883 {
 884         /*
 885          * Delay setting mp.prot: set it before calling perf_mmap__mmap.
 886          * Its value is decided by evsel's write_backward.
 887          * So &mp should not be passed through const pointer.
 888          */
 889         struct mmap_params mp = {
 890                 .nr_cblocks     = nr_cblocks,
 891                 .affinity       = affinity,
 892                 .flush          = flush,
 893                 .comp_level     = comp_level
 894         };
 895         struct perf_evlist_mmap_ops ops = {
 896                 .idx  = perf_evlist__mmap_cb_idx,
 897                 .get  = perf_evlist__mmap_cb_get,
 898                 .mmap = perf_evlist__mmap_cb_mmap,
 899         };
 900
 901         evlist->core.mmap_len = evlist__mmap_size(pages);
 902         pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
 903
 904         auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
 905                                    auxtrace_pages, auxtrace_overwrite);
 906
 907         return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
 908 }
 909
 910 int evlist__mmap(struct evlist *evlist, unsigned int pages)
 911 {
 912         return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
 913 }
 914
 915 int perf_evlist__create_maps(struct evlist *evlist, struct target *target)
 916 {
 917         bool all_threads = (target->per_thread && target->system_wide);
 918         struct perf_cpu_map *cpus;
 919         struct perf_thread_map *threads;
 920
 921         /*
 922          * If specify '-a' and '--per-thread' to perf record, perf record
 923          * will override '--per-thread'. target->per_thread = false and
 924          * target->system_wide = true.
 925          *
 926          * If specify '--per-thread' only to perf record,
 927          * target->per_thread = true and target->system_wide = false.
 928          *
 929          * So target->per_thread && target->system_wide is false.
 930          * For perf record, thread_map__new_str doesn't call
 931          * thread_map__new_all_cpus. That will keep perf record's
 932          * current behavior.
 933          *
 934          * For perf stat, it allows the case that target->per_thread and
 935          * target->system_wide are all true. It means to collect system-wide
 936          * per-thread data. thread_map__new_str will call
 937          * thread_map__new_all_cpus to enumerate all threads.
 938          */
 939         threads = thread_map__new_str(target->pid, target->tid, target->uid,
 940                                       all_threads);
 941
 942         if (!threads)
 943                 return -1;
 944
 945         if (target__uses_dummy_map(target))
 946                 cpus = perf_cpu_map__dummy_new();
 947         else
 948                 cpus = perf_cpu_map__new(target->cpu_list);
 949
 950         if (!cpus)
 951                 goto out_delete_threads;
 952
 953         evlist->core.has_user_cpus = !!target->cpu_list;
 954
 955         perf_evlist__set_maps(&evlist->core, cpus, threads);
 956
 957         /* as evlist now has references, put count here */
 958         perf_cpu_map__put(cpus);
 959         perf_thread_map__put(threads);
 960
 961         return 0;
 962
 963 out_delete_threads:
 964         perf_thread_map__put(threads);
 965         return -1;
 966 }
 967
 968 void __perf_evlist__set_sample_bit(struct evlist *evlist,
 969                                    enum perf_event_sample_format bit)
 970 {
 971         struct evsel *evsel;
 972
 973         evlist__for_each_entry(evlist, evsel)
 974                 __evsel__set_sample_bit(evsel, bit);
 975 }
 976
 977 void __perf_evlist__reset_sample_bit(struct evlist *evlist,
 978                                      enum perf_event_sample_format bit)
 979 {
 980         struct evsel *evsel;
 981
 982         evlist__for_each_entry(evlist, evsel)
 983                 __evsel__reset_sample_bit(evsel, bit);
 984 }
 985
 986 int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
 987 {
 988         struct evsel *evsel;
 989         int err = 0;
 990
 991         evlist__for_each_entry(evlist, evsel) {
 992                 if (evsel->filter == NULL)
 993                         continue;
 994
 995                 /*
 996                  * filters only work for tracepoint event, which doesn't have cpu limit.
 997                  * So evlist and evsel should always be same.
 998                  */
 999                 err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
1000                 if (err) {
1001                         *err_evsel = evsel;
1002                         break;
1003                 }
1004         }
1005
1006         return err;
1007 }
1008
1009 int perf_evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1010 {
1011         struct evsel *evsel;
1012         int err = 0;
1013
1014         if (filter == NULL)
1015                 return -1;
1016
1017         evlist__for_each_entry(evlist, evsel) {
1018                 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1019                         continue;
1020
1021                 err = evsel__set_filter(evsel, filter);
1022                 if (err)
1023                         break;
1024         }
1025
1026         return err;
1027 }
1028
1029 int perf_evlist__append_tp_filter(struct evlist *evlist, const char *filter)
1030 {
1031         struct evsel *evsel;
1032         int err = 0;
1033
1034         if (filter == NULL)
1035                 return -1;
1036
1037         evlist__for_each_entry(evlist, evsel) {
1038                 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1039                         continue;
1040
1041                 err = evsel__append_tp_filter(evsel, filter);
1042                 if (err)
1043                         break;
1044         }
1045
1046         return err;
1047 }
1048
1049 char *asprintf__tp_filter_pids(size_t npids, pid_t *pids)
1050 {
1051         char *filter;
1052         size_t i;
1053
1054         for (i = 0; i < npids; ++i) {
1055                 if (i == 0) {
1056                         if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1057                                 return NULL;
1058                 } else {
1059                         char *tmp;
1060
1061                         if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1062                                 goto out_free;
1063
1064                         free(filter);
1065                         filter = tmp;
1066                 }
1067         }
1068
1069         return filter;
1070 out_free:
1071         free(filter);
1072         return NULL;
1073 }
1074
1075 int perf_evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1076 {
1077         char *filter = asprintf__tp_filter_pids(npids, pids);
1078         int ret = perf_evlist__set_tp_filter(evlist, filter);
1079
1080         free(filter);
1081         return ret;
1082 }
1083
1084 int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
1085 {
1086         return perf_evlist__set_tp_filter_pids(evlist, 1, &pid);
1087 }
1088
1089 int perf_evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1090 {
1091         char *filter = asprintf__tp_filter_pids(npids, pids);
1092         int ret = perf_evlist__append_tp_filter(evlist, filter);
1093
1094         free(filter);
1095         return ret;
1096 }
1097
1098 int perf_evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
1099 {
1100         return perf_evlist__append_tp_filter_pids(evlist, 1, &pid);
1101 }
1102
1103 bool evlist__valid_sample_type(struct evlist *evlist)
1104 {
1105         struct evsel *pos;
1106
1107         if (evlist->core.nr_entries == 1)
1108                 return true;
1109
1110         if (evlist->id_pos < 0 || evlist->is_pos < 0)
1111                 return false;
1112
1113         evlist__for_each_entry(evlist, pos) {
1114                 if (pos->id_pos != evlist->id_pos ||
1115                     pos->is_pos != evlist->is_pos)
1116                         return false;
1117         }
1118
1119         return true;
1120 }
1121
1122 u64 __evlist__combined_sample_type(struct evlist *evlist)
1123 {
1124         struct evsel *evsel;
1125
1126         if (evlist->combined_sample_type)
1127                 return evlist->combined_sample_type;
1128
1129         evlist__for_each_entry(evlist, evsel)
1130                 evlist->combined_sample_type |= evsel->core.attr.sample_type;
1131
1132         return evlist->combined_sample_type;
1133 }
1134
1135 u64 evlist__combined_sample_type(struct evlist *evlist)
1136 {
1137         evlist->combined_sample_type = 0;
1138         return __evlist__combined_sample_type(evlist);
1139 }
1140
1141 u64 evlist__combined_branch_type(struct evlist *evlist)
1142 {
1143         struct evsel *evsel;
1144         u64 branch_type = 0;
1145
1146         evlist__for_each_entry(evlist, evsel)
1147                 branch_type |= evsel->core.attr.branch_sample_type;
1148         return branch_type;
1149 }
1150
1151 bool perf_evlist__valid_read_format(struct evlist *evlist)
1152 {
1153         struct evsel *first = evlist__first(evlist), *pos = first;
1154         u64 read_format = first->core.attr.read_format;
1155         u64 sample_type = first->core.attr.sample_type;
1156
1157         evlist__for_each_entry(evlist, pos) {
1158                 if (read_format != pos->core.attr.read_format) {
1159                         pr_debug("Read format differs %#" PRIx64 " vs %#" PRIx64 "\n",
1160                                  read_format, (u64)pos->core.attr.read_format);
1161                 }
1162         }
1163
1164         /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1165         if ((sample_type & PERF_SAMPLE_READ) &&
1166             !(read_format & PERF_FORMAT_ID)) {
1167                 return false;
1168         }
1169
1170         return true;
1171 }
1172
1173 u16 perf_evlist__id_hdr_size(struct evlist *evlist)
1174 {
1175         struct evsel *first = evlist__first(evlist);
1176         struct perf_sample *data;
1177         u64 sample_type;
1178         u16 size = 0;
1179
1180         if (!first->core.attr.sample_id_all)
1181                 goto out;
1182
1183         sample_type = first->core.attr.sample_type;
1184
1185         if (sample_type & PERF_SAMPLE_TID)
1186                 size += sizeof(data->tid) * 2;
1187
1188        if (sample_type & PERF_SAMPLE_TIME)
1189                 size += sizeof(data->time);
1190
1191         if (sample_type & PERF_SAMPLE_ID)
1192                 size += sizeof(data->id);
1193
1194         if (sample_type & PERF_SAMPLE_STREAM_ID)
1195                 size += sizeof(data->stream_id);
1196
1197         if (sample_type & PERF_SAMPLE_CPU)
1198                 size += sizeof(data->cpu) * 2;
1199
1200         if (sample_type & PERF_SAMPLE_IDENTIFIER)
1201                 size += sizeof(data->id);
1202 out:
1203         return size;
1204 }
1205
1206 bool evlist__valid_sample_id_all(struct evlist *evlist)
1207 {
1208         struct evsel *first = evlist__first(evlist), *pos = first;
1209
1210         evlist__for_each_entry_continue(evlist, pos) {
1211                 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1212                         return false;
1213         }
1214
1215         return true;
1216 }
1217
1218 bool evlist__sample_id_all(struct evlist *evlist)
1219 {
1220         struct evsel *first = evlist__first(evlist);
1221         return first->core.attr.sample_id_all;
1222 }
1223
1224 void perf_evlist__set_selected(struct evlist *evlist,
1225                                struct evsel *evsel)
1226 {
1227         evlist->selected = evsel;
1228 }
1229
1230 void evlist__close(struct evlist *evlist)
1231 {
1232         struct evsel *evsel;
1233         struct affinity affinity;
1234         int cpu, i;
1235
1236         /*
1237          * With perf record core.cpus is usually NULL.
1238          * Use the old method to handle this for now.
1239          */
1240         if (!evlist->core.cpus) {
1241                 evlist__for_each_entry_reverse(evlist, evsel)
1242                         evsel__close(evsel);
1243                 return;
1244         }
1245
1246         if (affinity__setup(&affinity) < 0)
1247                 return;
1248         evlist__for_each_cpu(evlist, i, cpu) {
1249                 affinity__set(&affinity, cpu);
1250
1251                 evlist__for_each_entry_reverse(evlist, evsel) {
1252                         if (evsel__cpu_iter_skip(evsel, cpu))
1253                             continue;
1254                         perf_evsel__close_cpu(&evsel->core, evsel->cpu_iter - 1);
1255                 }
1256         }
1257         affinity__cleanup(&affinity);
1258         evlist__for_each_entry_reverse(evlist, evsel) {
1259                 perf_evsel__free_fd(&evsel->core);
1260                 perf_evsel__free_id(&evsel->core);
1261         }
1262 }
1263
1264 static int perf_evlist__create_syswide_maps(struct evlist *evlist)
1265 {
1266         struct perf_cpu_map *cpus;
1267         struct perf_thread_map *threads;
1268         int err = -ENOMEM;
1269
1270         /*
1271          * Try reading /sys/devices/system/cpu/online to get
1272          * an all cpus map.
1273          *
1274          * FIXME: -ENOMEM is the best we can do here, the cpu_map
1275          * code needs an overhaul to properly forward the
1276          * error, and we may not want to do that fallback to a
1277          * default cpu identity map :-\
1278          */
1279         cpus = perf_cpu_map__new(NULL);
1280         if (!cpus)
1281                 goto out;
1282
1283         threads = perf_thread_map__new_dummy();
1284         if (!threads)
1285                 goto out_put;
1286
1287         perf_evlist__set_maps(&evlist->core, cpus, threads);
1288
1289         perf_thread_map__put(threads);
1290 out_put:
1291         perf_cpu_map__put(cpus);
1292 out:
1293         return err;
1294 }
1295
1296 int evlist__open(struct evlist *evlist)
1297 {
1298         struct evsel *evsel;
1299         int err;
1300
1301         /*
1302          * Default: one fd per CPU, all threads, aka systemwide
1303          * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1304          */
1305         if (evlist->core.threads == NULL && evlist->core.cpus == NULL) {
1306                 err = perf_evlist__create_syswide_maps(evlist);
1307                 if (err < 0)
1308                         goto out_err;
1309         }
1310
1311         perf_evlist__update_id_pos(evlist);
1312
1313         evlist__for_each_entry(evlist, evsel) {
1314                 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1315                 if (err < 0)
1316                         goto out_err;
1317         }
1318
1319         return 0;
1320 out_err:
1321         evlist__close(evlist);
1322         errno = -err;
1323         return err;
1324 }
1325
1326 int perf_evlist__prepare_workload(struct evlist *evlist, struct target *target,
1327                                   const char *argv[], bool pipe_output,
1328                                   void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1329 {
1330         int child_ready_pipe[2], go_pipe[2];
1331         char bf;
1332
1333         if (pipe(child_ready_pipe) < 0) {
1334                 perror("failed to create 'ready' pipe");
1335                 return -1;
1336         }
1337
1338         if (pipe(go_pipe) < 0) {
1339                 perror("failed to create 'go' pipe");
1340                 goto out_close_ready_pipe;
1341         }
1342
1343         evlist->workload.pid = fork();
1344         if (evlist->workload.pid < 0) {
1345                 perror("failed to fork");
1346                 goto out_close_pipes;
1347         }
1348
1349         if (!evlist->workload.pid) {
1350                 int ret;
1351
1352                 if (pipe_output)
1353                         dup2(2, 1);
1354
1355                 signal(SIGTERM, SIG_DFL);
1356
1357                 close(child_ready_pipe[0]);
1358                 close(go_pipe[1]);
1359                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1360
1361                 /*
1362                  * Tell the parent we're ready to go
1363                  */
1364                 close(child_ready_pipe[1]);
1365
1366                 /*
1367                  * Wait until the parent tells us to go.
1368                  */
1369                 ret = read(go_pipe[0], &bf, 1);
1370                 /*
1371                  * The parent will ask for the execvp() to be performed by
1372                  * writing exactly one byte, in workload.cork_fd, usually via
1373                  * perf_evlist__start_workload().
1374                  *
1375                  * For cancelling the workload without actually running it,
1376                  * the parent will just close workload.cork_fd, without writing
1377                  * anything, i.e. read will return zero and we just exit()
1378                  * here.
1379                  */
1380                 if (ret != 1) {
1381                         if (ret == -1)
1382                                 perror("unable to read pipe");
1383                         exit(ret);
1384                 }
1385
1386                 execvp(argv[0], (char **)argv);
1387
1388                 if (exec_error) {
1389                         union sigval val;
1390
1391                         val.sival_int = errno;
1392                         if (sigqueue(getppid(), SIGUSR1, val))
1393                                 perror(argv[0]);
1394                 } else
1395                         perror(argv[0]);
1396                 exit(-1);
1397         }
1398
1399         if (exec_error) {
1400                 struct sigaction act = {
1401                         .sa_flags     = SA_SIGINFO,
1402                         .sa_sigaction = exec_error,
1403                 };
1404                 sigaction(SIGUSR1, &act, NULL);
1405         }
1406
1407         if (target__none(target)) {
1408                 if (evlist->core.threads == NULL) {
1409                         fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1410                                 __func__, __LINE__);
1411                         goto out_close_pipes;
1412                 }
1413                 perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1414         }
1415
1416         close(child_ready_pipe[1]);
1417         close(go_pipe[0]);
1418         /*
1419          * wait for child to settle
1420          */
1421         if (read(child_ready_pipe[0], &bf, 1) == -1) {
1422                 perror("unable to read pipe");
1423                 goto out_close_pipes;
1424         }
1425
1426         fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1427         evlist->workload.cork_fd = go_pipe[1];
1428         close(child_ready_pipe[0]);
1429         return 0;
1430
1431 out_close_pipes:
1432         close(go_pipe[0]);
1433         close(go_pipe[1]);
1434 out_close_ready_pipe:
1435         close(child_ready_pipe[0]);
1436         close(child_ready_pipe[1]);
1437         return -1;
1438 }
1439
1440 int perf_evlist__start_workload(struct evlist *evlist)
1441 {
1442         if (evlist->workload.cork_fd > 0) {
1443                 char bf = 0;
1444                 int ret;
1445                 /*
1446                  * Remove the cork, let it rip!
1447                  */
1448                 ret = write(evlist->workload.cork_fd, &bf, 1);
1449                 if (ret < 0)
1450                         perror("unable to write to pipe");
1451
1452                 close(evlist->workload.cork_fd);
1453                 return ret;
1454         }
1455
1456         return 0;
1457 }
1458
1459 int perf_evlist__parse_sample(struct evlist *evlist, union perf_event *event,
1460                               struct perf_sample *sample)
1461 {
1462         struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1463
1464         if (!evsel)
1465                 return -EFAULT;
1466         return evsel__parse_sample(evsel, event, sample);
1467 }
1468
1469 int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
1470                                         union perf_event *event,
1471                                         u64 *timestamp)
1472 {
1473         struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1474
1475         if (!evsel)
1476                 return -EFAULT;
1477         return evsel__parse_sample_timestamp(evsel, event, timestamp);
1478 }
1479
1480 int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
1481 {
1482         int printed, value;
1483         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1484
1485         switch (err) {
1486         case EACCES:
1487         case EPERM:
1488                 printed = scnprintf(buf, size,
1489                                     "Error:\t%s.\n"
1490                                     "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1491
1492                 value = perf_event_paranoid();
1493
1494                 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1495
1496                 if (value >= 2) {
1497                         printed += scnprintf(buf + printed, size - printed,
1498                                              "For your workloads it needs to be <= 1\nHint:\t");
1499                 }
1500                 printed += scnprintf(buf + printed, size - printed,
1501                                      "For system wide tracing it needs to be set to -1.\n");
1502
1503                 printed += scnprintf(buf + printed, size - printed,
1504                                     "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1505                                     "Hint:\tThe current value is %d.", value);
1506                 break;
1507         case EINVAL: {
1508                 struct evsel *first = evlist__first(evlist);
1509                 int max_freq;
1510
1511                 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1512                         goto out_default;
1513
1514                 if (first->core.attr.sample_freq < (u64)max_freq)
1515                         goto out_default;
1516
1517                 printed = scnprintf(buf, size,
1518                                     "Error:\t%s.\n"
1519                                     "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1520                                     "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1521                                     emsg, max_freq, first->core.attr.sample_freq);
1522                 break;
1523         }
1524         default:
1525 out_default:
1526                 scnprintf(buf, size, "%s", emsg);
1527                 break;
1528         }
1529
1530         return 0;
1531 }
1532
1533 int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1534 {
1535         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1536         int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1537
1538         switch (err) {
1539         case EPERM:
1540                 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1541                 printed += scnprintf(buf + printed, size - printed,
1542                                      "Error:\t%s.\n"
1543                                      "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1544                                      "Hint:\tTried using %zd kB.\n",
1545                                      emsg, pages_max_per_user, pages_attempted);
1546
1547                 if (pages_attempted >= pages_max_per_user) {
1548                         printed += scnprintf(buf + printed, size - printed,
1549                                              "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1550                                              pages_max_per_user + pages_attempted);
1551                 }
1552
1553                 printed += scnprintf(buf + printed, size - printed,
1554                                      "Hint:\tTry using a smaller -m/--mmap-pages value.");
1555                 break;
1556         default:
1557                 scnprintf(buf, size, "%s", emsg);
1558                 break;
1559         }
1560
1561         return 0;
1562 }
1563
1564 void perf_evlist__to_front(struct evlist *evlist,
1565                            struct evsel *move_evsel)
1566 {
1567         struct evsel *evsel, *n;
1568         LIST_HEAD(move);
1569
1570         if (move_evsel == evlist__first(evlist))
1571                 return;
1572
1573         evlist__for_each_entry_safe(evlist, n, evsel) {
1574                 if (evsel->leader == move_evsel->leader)
1575                         list_move_tail(&evsel->core.node, &move);
1576         }
1577
1578         list_splice(&move, &evlist->core.entries);
1579 }
1580
1581 struct evsel *perf_evlist__get_tracking_event(struct evlist *evlist)
1582 {
1583         struct evsel *evsel;
1584
1585         evlist__for_each_entry(evlist, evsel) {
1586                 if (evsel->tracking)
1587                         return evsel;
1588         }
1589
1590         return evlist__first(evlist);
1591 }
1592
1593 void perf_evlist__set_tracking_event(struct evlist *evlist,
1594                                      struct evsel *tracking_evsel)
1595 {
1596         struct evsel *evsel;
1597
1598         if (tracking_evsel->tracking)
1599                 return;
1600
1601         evlist__for_each_entry(evlist, evsel) {
1602                 if (evsel != tracking_evsel)
1603                         evsel->tracking = false;
1604         }
1605
1606         tracking_evsel->tracking = true;
1607 }
1608
1609 struct evsel *
1610 perf_evlist__find_evsel_by_str(struct evlist *evlist,
1611                                const char *str)
1612 {
1613         struct evsel *evsel;
1614
1615         evlist__for_each_entry(evlist, evsel) {
1616                 if (!evsel->name)
1617                         continue;
1618                 if (strcmp(str, evsel->name) == 0)
1619                         return evsel;
1620         }
1621
1622         return NULL;
1623 }
1624
1625 void perf_evlist__toggle_bkw_mmap(struct evlist *evlist,
1626                                   enum bkw_mmap_state state)
1627 {
1628         enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1629         enum action {
1630                 NONE,
1631                 PAUSE,
1632                 RESUME,
1633         } action = NONE;
1634
1635         if (!evlist->overwrite_mmap)
1636                 return;
1637
1638         switch (old_state) {
1639         case BKW_MMAP_NOTREADY: {
1640                 if (state != BKW_MMAP_RUNNING)
1641                         goto state_err;
1642                 break;
1643         }
1644         case BKW_MMAP_RUNNING: {
1645                 if (state != BKW_MMAP_DATA_PENDING)
1646                         goto state_err;
1647                 action = PAUSE;
1648                 break;
1649         }
1650         case BKW_MMAP_DATA_PENDING: {
1651                 if (state != BKW_MMAP_EMPTY)
1652                         goto state_err;
1653                 break;
1654         }
1655         case BKW_MMAP_EMPTY: {
1656                 if (state != BKW_MMAP_RUNNING)
1657                         goto state_err;
1658                 action = RESUME;
1659                 break;
1660         }
1661         default:
1662                 WARN_ONCE(1, "Shouldn't get there\n");
1663         }
1664
1665         evlist->bkw_mmap_state = state;
1666
1667         switch (action) {
1668         case PAUSE:
1669                 perf_evlist__pause(evlist);
1670                 break;
1671         case RESUME:
1672                 perf_evlist__resume(evlist);
1673                 break;
1674         case NONE:
1675         default:
1676                 break;
1677         }
1678
1679 state_err:
1680         return;
1681 }
1682
1683 bool perf_evlist__exclude_kernel(struct evlist *evlist)
1684 {
1685         struct evsel *evsel;
1686
1687         evlist__for_each_entry(evlist, evsel) {
1688                 if (!evsel->core.attr.exclude_kernel)
1689                         return false;
1690         }
1691
1692         return true;
1693 }
1694
1695 /*
1696  * Events in data file are not collect in groups, but we still want
1697  * the group display. Set the artificial group and set the leader's
1698  * forced_leader flag to notify the display code.
1699  */
1700 void perf_evlist__force_leader(struct evlist *evlist)
1701 {
1702         if (!evlist->nr_groups) {
1703                 struct evsel *leader = evlist__first(evlist);
1704
1705                 perf_evlist__set_leader(evlist);
1706                 leader->forced_leader = true;
1707         }
1708 }
1709
1710 struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list,
1711                                                  struct evsel *evsel,
1712                                                 bool close)
1713 {
1714         struct evsel *c2, *leader;
1715         bool is_open = true;
1716
1717         leader = evsel->leader;
1718         pr_debug("Weak group for %s/%d failed\n",
1719                         leader->name, leader->core.nr_members);
1720
1721         /*
1722          * for_each_group_member doesn't work here because it doesn't
1723          * include the first entry.
1724          */
1725         evlist__for_each_entry(evsel_list, c2) {
1726                 if (c2 == evsel)
1727                         is_open = false;
1728                 if (c2->leader == leader) {
1729                         if (is_open && close)
1730                                 perf_evsel__close(&c2->core);
1731                         c2->leader = c2;
1732                         c2->core.nr_members = 0;
1733                         /*
1734                          * Set this for all former members of the group
1735                          * to indicate they get reopened.
1736                          */
1737                         c2->reset_group = true;
1738                 }
1739         }
1740         return leader;
1741 }
1742
1743 static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1744 {
1745         char *s, *p;
1746         int ret = 0, fd;
1747
1748         if (strncmp(str, "fifo:", 5))
1749                 return -EINVAL;
1750
1751         str += 5;
1752         if (!*str || *str == ',')
1753                 return -EINVAL;
1754
1755         s = strdup(str);
1756         if (!s)
1757                 return -ENOMEM;
1758
1759         p = strchr(s, ',');
1760         if (p)
1761                 *p = '\0';
1762
1763         /*
1764          * O_RDWR avoids POLLHUPs which is necessary to allow the other
1765          * end of a FIFO to be repeatedly opened and closed.
1766          */
1767         fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1768         if (fd < 0) {
1769                 pr_err("Failed to open '%s'\n", s);
1770                 ret = -errno;
1771                 goto out_free;
1772         }
1773         *ctl_fd = fd;
1774         *ctl_fd_close = true;
1775
1776         if (p && *++p) {
1777                 /* O_RDWR | O_NONBLOCK means the other end need not be open */
1778                 fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1779                 if (fd < 0) {
1780                         pr_err("Failed to open '%s'\n", p);
1781                         ret = -errno;
1782                         goto out_free;
1783                 }
1784                 *ctl_fd_ack = fd;
1785         }
1786
1787 out_free:
1788         free(s);
1789         return ret;
1790 }
1791
1792 int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1793 {
1794         char *comma = NULL, *endptr = NULL;
1795
1796         *ctl_fd_close = false;
1797
1798         if (strncmp(str, "fd:", 3))
1799                 return evlist__parse_control_fifo(str, ctl_fd, ctl_fd_ack, ctl_fd_close);
1800
1801         *ctl_fd = strtoul(&str[3], &endptr, 0);
1802         if (endptr == &str[3])
1803                 return -EINVAL;
1804
1805         comma = strchr(str, ',');
1806         if (comma) {
1807                 if (endptr != comma)
1808                         return -EINVAL;
1809
1810                 *ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
1811                 if (endptr == comma + 1 || *endptr != '\0')
1812                         return -EINVAL;
1813         }
1814
1815         return 0;
1816 }
1817
1818 void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close)
1819 {
1820         if (*ctl_fd_close) {
1821                 *ctl_fd_close = false;
1822                 close(ctl_fd);
1823                 if (ctl_fd_ack >= 0)
1824                         close(ctl_fd_ack);
1825         }
1826 }
1827
1828 int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
1829 {
1830         if (fd == -1) {
1831                 pr_debug("Control descriptor is not initialized\n");
1832                 return 0;
1833         }
1834
1835         evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
1836                                                      fdarray_flag__nonfilterable);
1837         if (evlist->ctl_fd.pos < 0) {
1838                 evlist->ctl_fd.pos = -1;
1839                 pr_err("Failed to add ctl fd entry: %m\n");
1840                 return -1;
1841         }
1842
1843         evlist->ctl_fd.fd = fd;
1844         evlist->ctl_fd.ack = ack;
1845
1846         return 0;
1847 }
1848
1849 bool evlist__ctlfd_initialized(struct evlist *evlist)
1850 {
1851         return evlist->ctl_fd.pos >= 0;
1852 }
1853
1854 int evlist__finalize_ctlfd(struct evlist *evlist)
1855 {
1856         struct pollfd *entries = evlist->core.pollfd.entries;
1857
1858         if (!evlist__ctlfd_initialized(evlist))
1859                 return 0;
1860
1861         entries[evlist->ctl_fd.pos].fd = -1;
1862         entries[evlist->ctl_fd.pos].events = 0;
1863         entries[evlist->ctl_fd.pos].revents = 0;
1864
1865         evlist->ctl_fd.pos = -1;
1866         evlist->ctl_fd.ack = -1;
1867         evlist->ctl_fd.fd = -1;
1868
1869         return 0;
1870 }
1871
1872 static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
1873                               char *cmd_data, size_t data_size)
1874 {
1875         int err;
1876         char c;
1877         size_t bytes_read = 0;
1878
1879         *cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1880         memset(cmd_data, 0, data_size);
1881         data_size--;
1882
1883         do {
1884                 err = read(evlist->ctl_fd.fd, &c, 1);
1885                 if (err > 0) {
1886                         if (c == '\n' || c == '\0')
1887                                 break;
1888                         cmd_data[bytes_read++] = c;
1889                         if (bytes_read == data_size)
1890                                 break;
1891                         continue;
1892                 } else if (err == -1) {
1893                         if (errno == EINTR)
1894                                 continue;
1895                         if (errno == EAGAIN || errno == EWOULDBLOCK)
1896                                 err = 0;
1897                         else
1898                                 pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
1899                 }
1900                 break;
1901         } while (1);
1902
1903         pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
1904                  bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
1905
1906         if (bytes_read > 0) {
1907                 if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
1908                              (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
1909                         *cmd = EVLIST_CTL_CMD_ENABLE;
1910                 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
1911                                     (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) {
1912                         *cmd = EVLIST_CTL_CMD_DISABLE;
1913                 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_SNAPSHOT_TAG,
1914                                     (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
1915                         *cmd = EVLIST_CTL_CMD_SNAPSHOT;
1916                         pr_debug("is snapshot\n");
1917                 }
1918         }
1919
1920         return bytes_read ? (int)bytes_read : err;
1921 }
1922
1923 int evlist__ctlfd_ack(struct evlist *evlist)
1924 {
1925         int err;
1926
1927         if (evlist->ctl_fd.ack == -1)
1928                 return 0;
1929
1930         err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG,
1931                     sizeof(EVLIST_CTL_CMD_ACK_TAG));
1932         if (err == -1)
1933                 pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack);
1934
1935         return err;
1936 }
1937
1938 int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
1939 {
1940         int err = 0;
1941         char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
1942         int ctlfd_pos = evlist->ctl_fd.pos;
1943         struct pollfd *entries = evlist->core.pollfd.entries;
1944
1945         if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
1946                 return 0;
1947
1948         if (entries[ctlfd_pos].revents & POLLIN) {
1949                 err = evlist__ctlfd_recv(evlist, cmd, cmd_data,
1950                                          EVLIST_CTL_CMD_MAX_LEN);
1951                 if (err > 0) {
1952                         switch (*cmd) {
1953                         case EVLIST_CTL_CMD_ENABLE:
1954                                 evlist__enable(evlist);
1955                                 break;
1956                         case EVLIST_CTL_CMD_DISABLE:
1957                                 evlist__disable(evlist);
1958                                 break;
1959                         case EVLIST_CTL_CMD_SNAPSHOT:
1960                                 break;
1961                         case EVLIST_CTL_CMD_ACK:
1962                         case EVLIST_CTL_CMD_UNSUPPORTED:
1963                         default:
1964                                 pr_debug("ctlfd: unsupported %d\n", *cmd);
1965                                 break;
1966                         }
1967                         if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED ||
1968                               *cmd == EVLIST_CTL_CMD_SNAPSHOT))
1969                                 evlist__ctlfd_ack(evlist);
1970                 }
1971         }
1972
1973         if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR))
1974                 evlist__finalize_ctlfd(evlist);
1975         else
1976                 entries[ctlfd_pos].revents = 0;
1977
1978         return err;
1979 }
1980
1981 struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
1982 {
1983         struct evsel *evsel;
1984
1985         evlist__for_each_entry(evlist, evsel) {
1986                 if (evsel->idx == idx)
1987                         return evsel;
1988         }
1989         return NULL;
1990 }