1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   4 *
   5 * Parts came from builtin-{top,stat,record}.c, see those files for further
   6 * copyright notes.
   7 */
   8#include <api/fs/fs.h>
   9#include <errno.h>
  10#include <inttypes.h>
  11#include <poll.h>
  12#include "cpumap.h"
  13#include "util/mmap.h"
  14#include "thread_map.h"
  15#include "target.h"
  16#include "evlist.h"
  17#include "evsel.h"
  18#include "record.h"
  19#include "debug.h"
  20#include "units.h"
  21#include "bpf_counter.h"
  22#include <internal/lib.h> // page_size
  23#include "affinity.h"
  24#include "../perf.h"
  25#include "asm/bug.h"
  26#include "bpf-event.h"
  27#include "util/event.h"
  28#include "util/string2.h"
  29#include "util/perf_api_probe.h"
  30#include "util/evsel_fprintf.h"
  31#include "util/pmu.h"
  32#include "util/sample.h"
  33#include "util/bpf-filter.h"
  34#include "util/stat.h"
  35#include "util/util.h"
  36#include "util/env.h"
  37#include "util/intel-tpebs.h"
  38#include <signal.h>
  39#include <unistd.h>
  40#include <sched.h>
  41#include <stdlib.h>
  42
  43#include "parse-events.h"
  44#include <subcmd/parse-options.h>
  45
  46#include <fcntl.h>
  47#include <sys/ioctl.h>
  48#include <sys/mman.h>
  49#include <sys/prctl.h>
  50#include <sys/timerfd.h>
  51#include <sys/wait.h>
  52
  53#include <linux/bitops.h>
  54#include <linux/hash.h>
  55#include <linux/log2.h>
  56#include <linux/err.h>
  57#include <linux/string.h>
  58#include <linux/time64.h>
  59#include <linux/zalloc.h>
  60#include <perf/evlist.h>
  61#include <perf/evsel.h>
  62#include <perf/cpumap.h>
  63#include <perf/mmap.h>
  64
  65#include <internal/xyarray.h>
  66
  67#ifdef LACKS_SIGQUEUE_PROTOTYPE
  68int sigqueue(pid_t pid, int sig, const union sigval value);
  69#endif
  70
  71#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
  72#define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
  73
  74void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
  75		  struct perf_thread_map *threads)
  76{
  77	perf_evlist__init(&evlist->core);
  78	perf_evlist__set_maps(&evlist->core, cpus, threads);
  79	evlist->workload.pid = -1;
  80	evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
  81	evlist->ctl_fd.fd = -1;
  82	evlist->ctl_fd.ack = -1;
  83	evlist->ctl_fd.pos = -1;
  84	evlist->nr_br_cntr = -1;
  85}
  86
  87struct evlist *evlist__new(void)
  88{
  89	struct evlist *evlist = zalloc(sizeof(*evlist));
  90
  91	if (evlist != NULL)
  92		evlist__init(evlist, NULL, NULL);
  93
  94	return evlist;
  95}
  96
  97struct evlist *evlist__new_default(void)
  98{
  99	struct evlist *evlist = evlist__new();
 100	bool can_profile_kernel;
 101	int err;
 102
 103	if (!evlist)
 104		return NULL;
 105
 106	can_profile_kernel = perf_event_paranoid_check(1);
 107	err = parse_event(evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
 108	if (err) {
 109		evlist__delete(evlist);
 110		return NULL;
 111	}
 112
 113	if (evlist->core.nr_entries > 1) {
 114		struct evsel *evsel;
 115
 116		evlist__for_each_entry(evlist, evsel)
 117			evsel__set_sample_id(evsel, /*can_sample_identifier=*/false);
 118	}
 119
 120	return evlist;
 121}
 122
 123struct evlist *evlist__new_dummy(void)
 124{
 125	struct evlist *evlist = evlist__new();
 126
 127	if (evlist && evlist__add_dummy(evlist)) {
 128		evlist__delete(evlist);
 129		evlist = NULL;
 130	}
 131
 132	return evlist;
 133}
 134
 135/**
 136 * evlist__set_id_pos - set the positions of event ids.
 137 * @evlist: selected event list
 138 *
 139 * Events with compatible sample types all have the same id_pos
 140 * and is_pos.  For convenience, put a copy on evlist.
 141 */
 142void evlist__set_id_pos(struct evlist *evlist)
 143{
 144	struct evsel *first = evlist__first(evlist);
 145
 146	evlist->id_pos = first->id_pos;
 147	evlist->is_pos = first->is_pos;
 148}
 149
 150static void evlist__update_id_pos(struct evlist *evlist)
 151{
 152	struct evsel *evsel;
 153
 154	evlist__for_each_entry(evlist, evsel)
 155		evsel__calc_id_pos(evsel);
 156
 157	evlist__set_id_pos(evlist);
 158}
 159
 160static void evlist__purge(struct evlist *evlist)
 161{
 162	struct evsel *pos, *n;
 163
 164	evlist__for_each_entry_safe(evlist, n, pos) {
 165		list_del_init(&pos->core.node);
 166		pos->evlist = NULL;
 167		evsel__delete(pos);
 168	}
 169
 170	evlist->core.nr_entries = 0;
 171}
 172
 173void evlist__exit(struct evlist *evlist)
 174{
 175	event_enable_timer__exit(&evlist->eet);
 176	zfree(&evlist->mmap);
 177	zfree(&evlist->overwrite_mmap);
 178	perf_evlist__exit(&evlist->core);
 179}
 180
 181void evlist__delete(struct evlist *evlist)
 182{
 183	if (evlist == NULL)
 184		return;
 185
 186	tpebs_delete();
 187	evlist__free_stats(evlist);
 188	evlist__munmap(evlist);
 189	evlist__close(evlist);
 190	evlist__purge(evlist);
 191	evlist__exit(evlist);
 192	free(evlist);
 193}
 194
 195void evlist__add(struct evlist *evlist, struct evsel *entry)
 196{
 197	perf_evlist__add(&evlist->core, &entry->core);
 198	entry->evlist = evlist;
 199	entry->tracking = !entry->core.idx;
 200
 201	if (evlist->core.nr_entries == 1)
 202		evlist__set_id_pos(evlist);
 203}
 204
 205void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 206{
 207	evsel->evlist = NULL;
 208	perf_evlist__remove(&evlist->core, &evsel->core);
 209}
 210
 211void evlist__splice_list_tail(struct evlist *evlist, struct list_head *list)
 212{
 213	while (!list_empty(list)) {
 214		struct evsel *evsel, *temp, *leader = NULL;
 215
 216		__evlist__for_each_entry_safe(list, temp, evsel) {
 217			list_del_init(&evsel->core.node);
 218			evlist__add(evlist, evsel);
 219			leader = evsel;
 220			break;
 221		}
 222
 223		__evlist__for_each_entry_safe(list, temp, evsel) {
 224			if (evsel__has_leader(evsel, leader)) {
 225				list_del_init(&evsel->core.node);
 226				evlist__add(evlist, evsel);
 227			}
 228		}
 229	}
 230}
 231
 232int __evlist__set_tracepoints_handlers(struct evlist *evlist,
 233				       const struct evsel_str_handler *assocs, size_t nr_assocs)
 234{
 235	size_t i;
 236	int err;
 237
 238	for (i = 0; i < nr_assocs; i++) {
 239		// Adding a handler for an event not in this evlist, just ignore it.
 240		struct evsel *evsel = evlist__find_tracepoint_by_name(evlist, assocs[i].name);
 241		if (evsel == NULL)
 242			continue;
 243
 244		err = -EEXIST;
 245		if (evsel->handler != NULL)
 246			goto out;
 247		evsel->handler = assocs[i].handler;
 248	}
 249
 250	err = 0;
 251out:
 252	return err;
 253}
 254
 255static void evlist__set_leader(struct evlist *evlist)
 256{
 257	perf_evlist__set_leader(&evlist->core);
 258}
 259
 260static struct evsel *evlist__dummy_event(struct evlist *evlist)
 261{
 262	struct perf_event_attr attr = {
 263		.type	= PERF_TYPE_SOFTWARE,
 264		.config = PERF_COUNT_SW_DUMMY,
 265		.size	= sizeof(attr), /* to capture ABI version */
 266		/* Avoid frequency mode for dummy events to avoid associated timers. */
 267		.freq = 0,
 268		.sample_period = 1,
 269	};
 270
 271	return evsel__new_idx(&attr, evlist->core.nr_entries);
 272}
 273
 274int evlist__add_dummy(struct evlist *evlist)
 275{
 276	struct evsel *evsel = evlist__dummy_event(evlist);
 277
 278	if (evsel == NULL)
 279		return -ENOMEM;
 280
 281	evlist__add(evlist, evsel);
 282	return 0;
 283}
 284
 285struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide)
 286{
 287	struct evsel *evsel = evlist__dummy_event(evlist);
 288
 289	if (!evsel)
 290		return NULL;
 291
 292	evsel->core.attr.exclude_kernel = 1;
 293	evsel->core.attr.exclude_guest = 1;
 294	evsel->core.attr.exclude_hv = 1;
 295	evsel->core.system_wide = system_wide;
 296	evsel->no_aux_samples = true;
 297	evsel->name = strdup("dummy:u");
 298
 299	evlist__add(evlist, evsel);
 300	return evsel;
 301}
 302
 303#ifdef HAVE_LIBTRACEEVENT
 304struct evsel *evlist__add_sched_switch(struct evlist *evlist, bool system_wide)
 305{
 306	struct evsel *evsel = evsel__newtp_idx("sched", "sched_switch", 0,
 307					       /*format=*/true);
 308
 309	if (IS_ERR(evsel))
 310		return evsel;
 311
 312	evsel__set_sample_bit(evsel, CPU);
 313	evsel__set_sample_bit(evsel, TIME);
 314
 315	evsel->core.system_wide = system_wide;
 316	evsel->no_aux_samples = true;
 317
 318	evlist__add(evlist, evsel);
 319	return evsel;
 320}
 321#endif
 322
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 323struct evsel *evlist__find_tracepoint_by_name(struct evlist *evlist, const char *name)
 324{
 325	struct evsel *evsel;
 326
 327	evlist__for_each_entry(evlist, evsel) {
 328		if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
 329		    (strcmp(evsel->name, name) == 0))
 330			return evsel;
 331	}
 332
 333	return NULL;
 334}
 335
 336#ifdef HAVE_LIBTRACEEVENT
 337int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler)
 338{
 339	struct evsel *evsel = evsel__newtp(sys, name);
 340
 341	if (IS_ERR(evsel))
 342		return -1;
 343
 344	evsel->handler = handler;
 345	evlist__add(evlist, evsel);
 346	return 0;
 347}
 348#endif
 349
 350struct evlist_cpu_iterator evlist__cpu_begin(struct evlist *evlist, struct affinity *affinity)
 351{
 352	struct evlist_cpu_iterator itr = {
 353		.container = evlist,
 354		.evsel = NULL,
 355		.cpu_map_idx = 0,
 356		.evlist_cpu_map_idx = 0,
 357		.evlist_cpu_map_nr = perf_cpu_map__nr(evlist->core.all_cpus),
 358		.cpu = (struct perf_cpu){ .cpu = -1},
 359		.affinity = affinity,
 360	};
 361
 362	if (evlist__empty(evlist)) {
 363		/* Ensure the empty list doesn't iterate. */
 364		itr.evlist_cpu_map_idx = itr.evlist_cpu_map_nr;
 365	} else {
 366		itr.evsel = evlist__first(evlist);
 367		if (itr.affinity) {
 368			itr.cpu = perf_cpu_map__cpu(evlist->core.all_cpus, 0);
 369			affinity__set(itr.affinity, itr.cpu.cpu);
 370			itr.cpu_map_idx = perf_cpu_map__idx(itr.evsel->core.cpus, itr.cpu);
 371			/*
 372			 * If this CPU isn't in the evsel's cpu map then advance
 373			 * through the list.
 374			 */
 375			if (itr.cpu_map_idx == -1)
 376				evlist_cpu_iterator__next(&itr);
 377		}
 378	}
 379	return itr;
 380}
 381
 382void evlist_cpu_iterator__next(struct evlist_cpu_iterator *evlist_cpu_itr)
 383{
 384	while (evlist_cpu_itr->evsel != evlist__last(evlist_cpu_itr->container)) {
 385		evlist_cpu_itr->evsel = evsel__next(evlist_cpu_itr->evsel);
 386		evlist_cpu_itr->cpu_map_idx =
 387			perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
 388					  evlist_cpu_itr->cpu);
 389		if (evlist_cpu_itr->cpu_map_idx != -1)
 390			return;
 391	}
 392	evlist_cpu_itr->evlist_cpu_map_idx++;
 393	if (evlist_cpu_itr->evlist_cpu_map_idx < evlist_cpu_itr->evlist_cpu_map_nr) {
 394		evlist_cpu_itr->evsel = evlist__first(evlist_cpu_itr->container);
 395		evlist_cpu_itr->cpu =
 396			perf_cpu_map__cpu(evlist_cpu_itr->container->core.all_cpus,
 397					  evlist_cpu_itr->evlist_cpu_map_idx);
 398		if (evlist_cpu_itr->affinity)
 399			affinity__set(evlist_cpu_itr->affinity, evlist_cpu_itr->cpu.cpu);
 400		evlist_cpu_itr->cpu_map_idx =
 401			perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
 402					  evlist_cpu_itr->cpu);
 403		/*
 404		 * If this CPU isn't in the evsel's cpu map then advance through
 405		 * the list.
 406		 */
 407		if (evlist_cpu_itr->cpu_map_idx == -1)
 408			evlist_cpu_iterator__next(evlist_cpu_itr);
 409	}
 410}
 411
 412bool evlist_cpu_iterator__end(const struct evlist_cpu_iterator *evlist_cpu_itr)
 413{
 414	return evlist_cpu_itr->evlist_cpu_map_idx >= evlist_cpu_itr->evlist_cpu_map_nr;
 415}
 416
 417static int evsel__strcmp(struct evsel *pos, char *evsel_name)
 418{
 419	if (!evsel_name)
 420		return 0;
 421	if (evsel__is_dummy_event(pos))
 422		return 1;
 423	return !evsel__name_is(pos, evsel_name);
 424}
 425
 426static int evlist__is_enabled(struct evlist *evlist)
 427{
 428	struct evsel *pos;
 429
 430	evlist__for_each_entry(evlist, pos) {
 431		if (!evsel__is_group_leader(pos) || !pos->core.fd)
 432			continue;
 433		/* If at least one event is enabled, evlist is enabled. */
 434		if (!pos->disabled)
 435			return true;
 436	}
 437	return false;
 438}
 439
 440static void __evlist__disable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
 441{
 442	struct evsel *pos;
 443	struct evlist_cpu_iterator evlist_cpu_itr;
 444	struct affinity saved_affinity, *affinity = NULL;
 445	bool has_imm = false;
 446
 447	// See explanation in evlist__close()
 448	if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
 449		if (affinity__setup(&saved_affinity) < 0)
 450			return;
 451		affinity = &saved_affinity;
 452	}
 453
 454	/* Disable 'immediate' events last */
 455	for (int imm = 0; imm <= 1; imm++) {
 456		evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
 457			pos = evlist_cpu_itr.evsel;
 458			if (evsel__strcmp(pos, evsel_name))
 459				continue;
 460			if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
 461				continue;
 462			if (excl_dummy && evsel__is_dummy_event(pos))
 463				continue;
 464			if (pos->immediate)
 465				has_imm = true;
 466			if (pos->immediate != imm)
 467				continue;
 468			evsel__disable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
 469		}
 470		if (!has_imm)
 471			break;
 472	}
 473
 474	affinity__cleanup(affinity);
 475	evlist__for_each_entry(evlist, pos) {
 476		if (evsel__strcmp(pos, evsel_name))
 477			continue;
 478		if (!evsel__is_group_leader(pos) || !pos->core.fd)
 479			continue;
 480		if (excl_dummy && evsel__is_dummy_event(pos))
 481			continue;
 482		pos->disabled = true;
 483	}
 484
 485	/*
 486	 * If we disabled only single event, we need to check
 487	 * the enabled state of the evlist manually.
 488	 */
 489	if (evsel_name)
 490		evlist->enabled = evlist__is_enabled(evlist);
 491	else
 492		evlist->enabled = false;
 493}
 494
 495void evlist__disable(struct evlist *evlist)
 496{
 497	__evlist__disable(evlist, NULL, false);
 498}
 499
 500void evlist__disable_non_dummy(struct evlist *evlist)
 501{
 502	__evlist__disable(evlist, NULL, true);
 503}
 504
 505void evlist__disable_evsel(struct evlist *evlist, char *evsel_name)
 506{
 507	__evlist__disable(evlist, evsel_name, false);
 508}
 509
 510static void __evlist__enable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
 511{
 512	struct evsel *pos;
 513	struct evlist_cpu_iterator evlist_cpu_itr;
 514	struct affinity saved_affinity, *affinity = NULL;
 515
 516	// See explanation in evlist__close()
 517	if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
 518		if (affinity__setup(&saved_affinity) < 0)
 519			return;
 520		affinity = &saved_affinity;
 521	}
 522
 523	evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
 524		pos = evlist_cpu_itr.evsel;
 525		if (evsel__strcmp(pos, evsel_name))
 526			continue;
 527		if (!evsel__is_group_leader(pos) || !pos->core.fd)
 528			continue;
 529		if (excl_dummy && evsel__is_dummy_event(pos))
 530			continue;
 531		evsel__enable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
 532	}
 533	affinity__cleanup(affinity);
 534	evlist__for_each_entry(evlist, pos) {
 535		if (evsel__strcmp(pos, evsel_name))
 536			continue;
 537		if (!evsel__is_group_leader(pos) || !pos->core.fd)
 538			continue;
 539		if (excl_dummy && evsel__is_dummy_event(pos))
 540			continue;
 541		pos->disabled = false;
 542	}
 543
 544	/*
 545	 * Even single event sets the 'enabled' for evlist,
 546	 * so the toggle can work properly and toggle to
 547	 * 'disabled' state.
 548	 */
 549	evlist->enabled = true;
 550}
 551
 552void evlist__enable(struct evlist *evlist)
 553{
 554	__evlist__enable(evlist, NULL, false);
 555}
 556
 557void evlist__enable_non_dummy(struct evlist *evlist)
 558{
 559	__evlist__enable(evlist, NULL, true);
 560}
 561
 562void evlist__enable_evsel(struct evlist *evlist, char *evsel_name)
 563{
 564	__evlist__enable(evlist, evsel_name, false);
 565}
 566
 567void evlist__toggle_enable(struct evlist *evlist)
 568{
 569	(evlist->enabled ? evlist__disable : evlist__enable)(evlist);
 570}
 571
 572int evlist__add_pollfd(struct evlist *evlist, int fd)
 573{
 574	return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default);
 575}
 576
 577int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
 578{
 579	return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask);
 580}
 581
 582#ifdef HAVE_EVENTFD_SUPPORT
 583int evlist__add_wakeup_eventfd(struct evlist *evlist, int fd)
 584{
 585	return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
 586				       fdarray_flag__nonfilterable |
 587				       fdarray_flag__non_perf_event);
 588}
 589#endif
 590
 591int evlist__poll(struct evlist *evlist, int timeout)
 592{
 593	return perf_evlist__poll(&evlist->core, timeout);
 594}
 595
 596struct perf_sample_id *evlist__id2sid(struct evlist *evlist, u64 id)
 597{
 598	struct hlist_head *head;
 599	struct perf_sample_id *sid;
 600	int hash;
 601
 602	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 603	head = &evlist->core.heads[hash];
 604
 605	hlist_for_each_entry(sid, head, node)
 606		if (sid->id == id)
 607			return sid;
 608
 609	return NULL;
 610}
 611
 612struct evsel *evlist__id2evsel(struct evlist *evlist, u64 id)
 613{
 614	struct perf_sample_id *sid;
 615
 616	if (evlist->core.nr_entries == 1 || !id)
 617		return evlist__first(evlist);
 618
 619	sid = evlist__id2sid(evlist, id);
 620	if (sid)
 621		return container_of(sid->evsel, struct evsel, core);
 622
 623	if (!evlist__sample_id_all(evlist))
 624		return evlist__first(evlist);
 625
 626	return NULL;
 627}
 628
 629struct evsel *evlist__id2evsel_strict(struct evlist *evlist, u64 id)
 630{
 631	struct perf_sample_id *sid;
 632
 633	if (!id)
 634		return NULL;
 635
 636	sid = evlist__id2sid(evlist, id);
 637	if (sid)
 638		return container_of(sid->evsel, struct evsel, core);
 639
 640	return NULL;
 641}
 642
 643static int evlist__event2id(struct evlist *evlist, union perf_event *event, u64 *id)
 644{
 645	const __u64 *array = event->sample.array;
 646	ssize_t n;
 647
 648	n = (event->header.size - sizeof(event->header)) >> 3;
 649
 650	if (event->header.type == PERF_RECORD_SAMPLE) {
 651		if (evlist->id_pos >= n)
 652			return -1;
 653		*id = array[evlist->id_pos];
 654	} else {
 655		if (evlist->is_pos > n)
 656			return -1;
 657		n -= evlist->is_pos;
 658		*id = array[n];
 659	}
 660	return 0;
 661}
 662
 663struct evsel *evlist__event2evsel(struct evlist *evlist, union perf_event *event)
 664{
 665	struct evsel *first = evlist__first(evlist);
 666	struct hlist_head *head;
 667	struct perf_sample_id *sid;
 668	int hash;
 669	u64 id;
 670
 671	if (evlist->core.nr_entries == 1)
 672		return first;
 673
 674	if (!first->core.attr.sample_id_all &&
 675	    event->header.type != PERF_RECORD_SAMPLE)
 676		return first;
 677
 678	if (evlist__event2id(evlist, event, &id))
 679		return NULL;
 680
 681	/* Synthesized events have an id of zero */
 682	if (!id)
 683		return first;
 684
 685	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
 686	head = &evlist->core.heads[hash];
 687
 688	hlist_for_each_entry(sid, head, node) {
 689		if (sid->id == id)
 690			return container_of(sid->evsel, struct evsel, core);
 691	}
 692	return NULL;
 693}
 694
 695static int evlist__set_paused(struct evlist *evlist, bool value)
 696{
 697	int i;
 698
 699	if (!evlist->overwrite_mmap)
 700		return 0;
 701
 702	for (i = 0; i < evlist->core.nr_mmaps; i++) {
 703		int fd = evlist->overwrite_mmap[i].core.fd;
 704		int err;
 705
 706		if (fd < 0)
 707			continue;
 708		err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
 709		if (err)
 710			return err;
 711	}
 712	return 0;
 713}
 714
 715static int evlist__pause(struct evlist *evlist)
 716{
 717	return evlist__set_paused(evlist, true);
 718}
 719
 720static int evlist__resume(struct evlist *evlist)
 721{
 722	return evlist__set_paused(evlist, false);
 723}
 724
 725static void evlist__munmap_nofree(struct evlist *evlist)
 726{
 727	int i;
 728
 729	if (evlist->mmap)
 730		for (i = 0; i < evlist->core.nr_mmaps; i++)
 731			perf_mmap__munmap(&evlist->mmap[i].core);
 732
 733	if (evlist->overwrite_mmap)
 734		for (i = 0; i < evlist->core.nr_mmaps; i++)
 735			perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
 736}
 737
 738void evlist__munmap(struct evlist *evlist)
 739{
 740	evlist__munmap_nofree(evlist);
 741	zfree(&evlist->mmap);
 742	zfree(&evlist->overwrite_mmap);
 743}
 744
 745static void perf_mmap__unmap_cb(struct perf_mmap *map)
 746{
 747	struct mmap *m = container_of(map, struct mmap, core);
 748
 749	mmap__munmap(m);
 750}
 751
 752static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 753				       bool overwrite)
 754{
 755	int i;
 756	struct mmap *map;
 757
 758	map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
 759	if (!map)
 760		return NULL;
 761
 762	for (i = 0; i < evlist->core.nr_mmaps; i++) {
 763		struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
 764
 765		/*
 766		 * When the perf_mmap() call is made we grab one refcount, plus
 767		 * one extra to let perf_mmap__consume() get the last
 768		 * events after all real references (perf_mmap__get()) are
 769		 * dropped.
 770		 *
 771		 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 772		 * thus does perf_mmap__get() on it.
 773		 */
 774		perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
 775	}
 776
 777	return map;
 778}
 779
 780static void
 781perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
 782			 struct perf_evsel *_evsel,
 783			 struct perf_mmap_param *_mp,
 784			 int idx)
 785{
 786	struct evlist *evlist = container_of(_evlist, struct evlist, core);
 787	struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
 788	struct evsel *evsel = container_of(_evsel, struct evsel, core);
 789
 790	auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, evsel, idx);
 791}
 792
 793static struct perf_mmap*
 794perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx)
 795{
 796	struct evlist *evlist = container_of(_evlist, struct evlist, core);
 797	struct mmap *maps;
 798
 799	maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
 800
 801	if (!maps) {
 802		maps = evlist__alloc_mmap(evlist, overwrite);
 803		if (!maps)
 804			return NULL;
 805
 806		if (overwrite) {
 807			evlist->overwrite_mmap = maps;
 808			if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
 809				evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 810		} else {
 811			evlist->mmap = maps;
 812		}
 813	}
 814
 815	return &maps[idx].core;
 816}
 817
 818static int
 819perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
 820			  int output, struct perf_cpu cpu)
 821{
 822	struct mmap *map = container_of(_map, struct mmap, core);
 823	struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
 824
 825	return mmap__mmap(map, mp, output, cpu);
 826}
 827
 828unsigned long perf_event_mlock_kb_in_pages(void)
 829{
 830	unsigned long pages;
 831	int max;
 832
 833	if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
 834		/*
 835		 * Pick a once upon a time good value, i.e. things look
 836		 * strange since we can't read a sysctl value, but lets not
 837		 * die yet...
 838		 */
 839		max = 512;
 840	} else {
 841		max -= (page_size / 1024);
 842	}
 843
 844	pages = (max * 1024) / page_size;
 845	if (!is_power_of_2(pages))
 846		pages = rounddown_pow_of_two(pages);
 847
 848	return pages;
 849}
 850
 851size_t evlist__mmap_size(unsigned long pages)
 852{
 853	if (pages == UINT_MAX)
 854		pages = perf_event_mlock_kb_in_pages();
 855	else if (!is_power_of_2(pages))
 856		return 0;
 857
 858	return (pages + 1) * page_size;
 859}
 860
 861static long parse_pages_arg(const char *str, unsigned long min,
 862			    unsigned long max)
 863{
 864	unsigned long pages, val;
 865	static struct parse_tag tags[] = {
 866		{ .tag  = 'B', .mult = 1       },
 867		{ .tag  = 'K', .mult = 1 << 10 },
 868		{ .tag  = 'M', .mult = 1 << 20 },
 869		{ .tag  = 'G', .mult = 1 << 30 },
 870		{ .tag  = 0 },
 871	};
 872
 873	if (str == NULL)
 874		return -EINVAL;
 875
 876	val = parse_tag_value(str, tags);
 877	if (val != (unsigned long) -1) {
 878		/* we got file size value */
 879		pages = PERF_ALIGN(val, page_size) / page_size;
 880	} else {
 881		/* we got pages count value */
 882		char *eptr;
 883		pages = strtoul(str, &eptr, 10);
 884		if (*eptr != '\0')
 885			return -EINVAL;
 886	}
 887
 888	if (pages == 0 && min == 0) {
 889		/* leave number of pages at 0 */
 890	} else if (!is_power_of_2(pages)) {
 891		char buf[100];
 892
 893		/* round pages up to next power of 2 */
 894		pages = roundup_pow_of_two(pages);
 895		if (!pages)
 896			return -EINVAL;
 897
 898		unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
 899		pr_info("rounding mmap pages size to %s (%lu pages)\n",
 900			buf, pages);
 901	}
 902
 903	if (pages > max)
 904		return -EINVAL;
 905
 906	return pages;
 907}
 908
 909int __evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
 910{
 911	unsigned long max = UINT_MAX;
 912	long pages;
 913
 914	if (max > SIZE_MAX / page_size)
 915		max = SIZE_MAX / page_size;
 916
 917	pages = parse_pages_arg(str, 1, max);
 918	if (pages < 0) {
 919		pr_err("Invalid argument for --mmap_pages/-m\n");
 920		return -1;
 921	}
 922
 923	*mmap_pages = pages;
 924	return 0;
 925}
 926
 927int evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset __maybe_unused)
 928{
 929	return __evlist__parse_mmap_pages(opt->value, str);
 930}
 931
 932/**
 933 * evlist__mmap_ex - Create mmaps to receive events.
 934 * @evlist: list of events
 935 * @pages: map length in pages
 936 * @overwrite: overwrite older events?
 937 * @auxtrace_pages - auxtrace map length in pages
 938 * @auxtrace_overwrite - overwrite older auxtrace data?
 939 *
 940 * If @overwrite is %false the user needs to signal event consumption using
 941 * perf_mmap__write_tail().  Using evlist__mmap_read() does this
 942 * automatically.
 943 *
 944 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
 945 * consumption using auxtrace_mmap__write_tail().
 946 *
 947 * Return: %0 on success, negative error code otherwise.
 948 */
 949int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
 950			 unsigned int auxtrace_pages,
 951			 bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
 952			 int comp_level)
 953{
 954	/*
 955	 * Delay setting mp.prot: set it before calling perf_mmap__mmap.
 956	 * Its value is decided by evsel's write_backward.
 957	 * So &mp should not be passed through const pointer.
 958	 */
 959	struct mmap_params mp = {
 960		.nr_cblocks	= nr_cblocks,
 961		.affinity	= affinity,
 962		.flush		= flush,
 963		.comp_level	= comp_level
 964	};
 965	struct perf_evlist_mmap_ops ops = {
 966		.idx  = perf_evlist__mmap_cb_idx,
 967		.get  = perf_evlist__mmap_cb_get,
 968		.mmap = perf_evlist__mmap_cb_mmap,
 969	};
 970
 971	evlist->core.mmap_len = evlist__mmap_size(pages);
 972	pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
 973
 974	auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
 975				   auxtrace_pages, auxtrace_overwrite);
 976
 977	return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
 978}
 979
 980int evlist__mmap(struct evlist *evlist, unsigned int pages)
 981{
 982	return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
 983}
 984
 985int evlist__create_maps(struct evlist *evlist, struct target *target)
 986{
 987	bool all_threads = (target->per_thread && target->system_wide);
 988	struct perf_cpu_map *cpus;
 989	struct perf_thread_map *threads;
 990
 991	/*
 992	 * If specify '-a' and '--per-thread' to perf record, perf record
 993	 * will override '--per-thread'. target->per_thread = false and
 994	 * target->system_wide = true.
 995	 *
 996	 * If specify '--per-thread' only to perf record,
 997	 * target->per_thread = true and target->system_wide = false.
 998	 *
 999	 * So target->per_thread && target->system_wide is false.
1000	 * For perf record, thread_map__new_str doesn't call
1001	 * thread_map__new_all_cpus. That will keep perf record's
1002	 * current behavior.
1003	 *
1004	 * For perf stat, it allows the case that target->per_thread and
1005	 * target->system_wide are all true. It means to collect system-wide
1006	 * per-thread data. thread_map__new_str will call
1007	 * thread_map__new_all_cpus to enumerate all threads.
1008	 */
1009	threads = thread_map__new_str(target->pid, target->tid, target->uid,
1010				      all_threads);
1011
1012	if (!threads)
1013		return -1;
1014
1015	if (target__uses_dummy_map(target) && !evlist__has_bpf_output(evlist))
1016		cpus = perf_cpu_map__new_any_cpu();
1017	else
1018		cpus = perf_cpu_map__new(target->cpu_list);
1019
1020	if (!cpus)
1021		goto out_delete_threads;
1022
1023	evlist->core.has_user_cpus = !!target->cpu_list;
1024
1025	perf_evlist__set_maps(&evlist->core, cpus, threads);
1026
1027	/* as evlist now has references, put count here */
1028	perf_cpu_map__put(cpus);
1029	perf_thread_map__put(threads);
1030
1031	return 0;
1032
1033out_delete_threads:
1034	perf_thread_map__put(threads);
1035	return -1;
1036}
1037
1038int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel,
1039			  struct target *target)
1040{
1041	struct evsel *evsel;
1042	int err = 0;
1043
1044	evlist__for_each_entry(evlist, evsel) {
1045		/*
1046		 * filters only work for tracepoint event, which doesn't have cpu limit.
1047		 * So evlist and evsel should always be same.
1048		 */
1049		if (evsel->filter) {
1050			err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
1051			if (err) {
1052				*err_evsel = evsel;
1053				break;
1054			}
1055		}
1056
1057		/*
1058		 * non-tracepoint events can have BPF filters.
1059		 */
1060		if (!list_empty(&evsel->bpf_filters)) {
1061			err = perf_bpf_filter__prepare(evsel, target);
1062			if (err) {
1063				*err_evsel = evsel;
1064				break;
1065			}
1066		}
1067	}
1068
1069	return err;
1070}
1071
1072int evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1073{
1074	struct evsel *evsel;
1075	int err = 0;
1076
1077	if (filter == NULL)
1078		return -1;
1079
1080	evlist__for_each_entry(evlist, evsel) {
1081		if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1082			continue;
1083
1084		err = evsel__set_filter(evsel, filter);
1085		if (err)
1086			break;
1087	}
1088
1089	return err;
1090}
1091
1092int evlist__append_tp_filter(struct evlist *evlist, const char *filter)
1093{
1094	struct evsel *evsel;
1095	int err = 0;
1096
1097	if (filter == NULL)
1098		return -1;
1099
1100	evlist__for_each_entry(evlist, evsel) {
1101		if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1102			continue;
1103
1104		err = evsel__append_tp_filter(evsel, filter);
1105		if (err)
1106			break;
1107	}
1108
1109	return err;
1110}
1111
1112char *asprintf__tp_filter_pids(size_t npids, pid_t *pids)
1113{
1114	char *filter;
1115	size_t i;
1116
1117	for (i = 0; i < npids; ++i) {
1118		if (i == 0) {
1119			if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1120				return NULL;
1121		} else {
1122			char *tmp;
1123
1124			if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1125				goto out_free;
1126
1127			free(filter);
1128			filter = tmp;
1129		}
1130	}
1131
1132	return filter;
1133out_free:
1134	free(filter);
1135	return NULL;
1136}
1137
1138int evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1139{
1140	char *filter = asprintf__tp_filter_pids(npids, pids);
1141	int ret = evlist__set_tp_filter(evlist, filter);
1142
1143	free(filter);
1144	return ret;
1145}
1146
 
 
 
 
 
1147int evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1148{
1149	char *filter = asprintf__tp_filter_pids(npids, pids);
1150	int ret = evlist__append_tp_filter(evlist, filter);
1151
1152	free(filter);
1153	return ret;
1154}
1155
1156int evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
1157{
1158	return evlist__append_tp_filter_pids(evlist, 1, &pid);
1159}
1160
1161bool evlist__valid_sample_type(struct evlist *evlist)
1162{
1163	struct evsel *pos;
1164
1165	if (evlist->core.nr_entries == 1)
1166		return true;
1167
1168	if (evlist->id_pos < 0 || evlist->is_pos < 0)
1169		return false;
1170
1171	evlist__for_each_entry(evlist, pos) {
1172		if (pos->id_pos != evlist->id_pos ||
1173		    pos->is_pos != evlist->is_pos)
1174			return false;
1175	}
1176
1177	return true;
1178}
1179
1180u64 __evlist__combined_sample_type(struct evlist *evlist)
1181{
1182	struct evsel *evsel;
1183
1184	if (evlist->combined_sample_type)
1185		return evlist->combined_sample_type;
1186
1187	evlist__for_each_entry(evlist, evsel)
1188		evlist->combined_sample_type |= evsel->core.attr.sample_type;
1189
1190	return evlist->combined_sample_type;
1191}
1192
1193u64 evlist__combined_sample_type(struct evlist *evlist)
1194{
1195	evlist->combined_sample_type = 0;
1196	return __evlist__combined_sample_type(evlist);
1197}
1198
1199u64 evlist__combined_branch_type(struct evlist *evlist)
1200{
1201	struct evsel *evsel;
1202	u64 branch_type = 0;
1203
1204	evlist__for_each_entry(evlist, evsel)
1205		branch_type |= evsel->core.attr.branch_sample_type;
1206	return branch_type;
1207}
1208
1209static struct evsel *
1210evlist__find_dup_event_from_prev(struct evlist *evlist, struct evsel *event)
1211{
1212	struct evsel *pos;
1213
1214	evlist__for_each_entry(evlist, pos) {
1215		if (event == pos)
1216			break;
1217		if ((pos->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) &&
1218		    !strcmp(pos->name, event->name))
1219			return pos;
1220	}
1221	return NULL;
1222}
1223
1224#define MAX_NR_ABBR_NAME	(26 * 11)
1225
1226/*
1227 * The abbr name is from A to Z9. If the number of event
1228 * which requires the branch counter > MAX_NR_ABBR_NAME,
1229 * return NA.
1230 */
1231static void evlist__new_abbr_name(char *name)
1232{
1233	static int idx;
1234	int i = idx / 26;
1235
1236	if (idx >= MAX_NR_ABBR_NAME) {
1237		name[0] = 'N';
1238		name[1] = 'A';
1239		name[2] = '\0';
1240		return;
1241	}
1242
1243	name[0] = 'A' + (idx % 26);
1244
1245	if (!i)
1246		name[1] = '\0';
1247	else {
1248		name[1] = '0' + i - 1;
1249		name[2] = '\0';
1250	}
1251
1252	idx++;
1253}
1254
1255void evlist__update_br_cntr(struct evlist *evlist)
1256{
1257	struct evsel *evsel, *dup;
1258	int i = 0;
1259
1260	evlist__for_each_entry(evlist, evsel) {
1261		if (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) {
1262			evsel->br_cntr_idx = i++;
1263			evsel__leader(evsel)->br_cntr_nr++;
1264
1265			dup = evlist__find_dup_event_from_prev(evlist, evsel);
1266			if (dup)
1267				memcpy(evsel->abbr_name, dup->abbr_name, 3 * sizeof(char));
1268			else
1269				evlist__new_abbr_name(evsel->abbr_name);
1270		}
1271	}
1272	evlist->nr_br_cntr = i;
1273}
1274
1275bool evlist__valid_read_format(struct evlist *evlist)
1276{
1277	struct evsel *first = evlist__first(evlist), *pos = first;
1278	u64 read_format = first->core.attr.read_format;
1279	u64 sample_type = first->core.attr.sample_type;
1280
1281	evlist__for_each_entry(evlist, pos) {
1282		if (read_format != pos->core.attr.read_format) {
1283			pr_debug("Read format differs %#" PRIx64 " vs %#" PRIx64 "\n",
1284				 read_format, (u64)pos->core.attr.read_format);
1285		}
1286	}
1287
1288	/* PERF_SAMPLE_READ implies PERF_FORMAT_ID. */
1289	if ((sample_type & PERF_SAMPLE_READ) &&
1290	    !(read_format & PERF_FORMAT_ID)) {
1291		return false;
1292	}
1293
1294	return true;
1295}
1296
1297u16 evlist__id_hdr_size(struct evlist *evlist)
1298{
1299	struct evsel *first = evlist__first(evlist);
1300
1301	return first->core.attr.sample_id_all ? evsel__id_hdr_size(first) : 0;
1302}
1303
1304bool evlist__valid_sample_id_all(struct evlist *evlist)
1305{
1306	struct evsel *first = evlist__first(evlist), *pos = first;
1307
1308	evlist__for_each_entry_continue(evlist, pos) {
1309		if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1310			return false;
1311	}
1312
1313	return true;
1314}
1315
1316bool evlist__sample_id_all(struct evlist *evlist)
1317{
1318	struct evsel *first = evlist__first(evlist);
1319	return first->core.attr.sample_id_all;
1320}
1321
1322void evlist__set_selected(struct evlist *evlist, struct evsel *evsel)
1323{
1324	evlist->selected = evsel;
1325}
1326
1327void evlist__close(struct evlist *evlist)
1328{
1329	struct evsel *evsel;
1330	struct evlist_cpu_iterator evlist_cpu_itr;
1331	struct affinity affinity;
1332
1333	/*
1334	 * With perf record core.user_requested_cpus is usually NULL.
1335	 * Use the old method to handle this for now.
1336	 */
1337	if (!evlist->core.user_requested_cpus ||
1338	    cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
1339		evlist__for_each_entry_reverse(evlist, evsel)
1340			evsel__close(evsel);
1341		return;
1342	}
1343
1344	if (affinity__setup(&affinity) < 0)
1345		return;
1346
1347	evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) {
1348		perf_evsel__close_cpu(&evlist_cpu_itr.evsel->core,
1349				      evlist_cpu_itr.cpu_map_idx);
1350	}
1351
1352	affinity__cleanup(&affinity);
1353	evlist__for_each_entry_reverse(evlist, evsel) {
1354		perf_evsel__free_fd(&evsel->core);
1355		perf_evsel__free_id(&evsel->core);
1356	}
1357	perf_evlist__reset_id_hash(&evlist->core);
1358}
1359
1360static int evlist__create_syswide_maps(struct evlist *evlist)
1361{
1362	struct perf_cpu_map *cpus;
1363	struct perf_thread_map *threads;
1364
1365	/*
1366	 * Try reading /sys/devices/system/cpu/online to get
1367	 * an all cpus map.
1368	 *
1369	 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1370	 * code needs an overhaul to properly forward the
1371	 * error, and we may not want to do that fallback to a
1372	 * default cpu identity map :-\
1373	 */
1374	cpus = perf_cpu_map__new_online_cpus();
1375	if (!cpus)
1376		goto out;
1377
1378	threads = perf_thread_map__new_dummy();
1379	if (!threads)
1380		goto out_put;
1381
1382	perf_evlist__set_maps(&evlist->core, cpus, threads);
1383
1384	perf_thread_map__put(threads);
1385out_put:
1386	perf_cpu_map__put(cpus);
1387out:
1388	return -ENOMEM;
1389}
1390
1391int evlist__open(struct evlist *evlist)
1392{
1393	struct evsel *evsel;
1394	int err;
1395
1396	/*
1397	 * Default: one fd per CPU, all threads, aka systemwide
1398	 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1399	 */
1400	if (evlist->core.threads == NULL && evlist->core.user_requested_cpus == NULL) {
1401		err = evlist__create_syswide_maps(evlist);
1402		if (err < 0)
1403			goto out_err;
1404	}
1405
1406	evlist__update_id_pos(evlist);
1407
1408	evlist__for_each_entry(evlist, evsel) {
1409		err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1410		if (err < 0)
1411			goto out_err;
1412	}
1413
1414	return 0;
1415out_err:
1416	evlist__close(evlist);
1417	errno = -err;
1418	return err;
1419}
1420
1421int evlist__prepare_workload(struct evlist *evlist, struct target *target, const char *argv[],
1422			     bool pipe_output, void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1423{
1424	int child_ready_pipe[2], go_pipe[2];
1425	char bf;
1426
1427	evlist->workload.cork_fd = -1;
1428
1429	if (pipe(child_ready_pipe) < 0) {
1430		perror("failed to create 'ready' pipe");
1431		return -1;
1432	}
1433
1434	if (pipe(go_pipe) < 0) {
1435		perror("failed to create 'go' pipe");
1436		goto out_close_ready_pipe;
1437	}
1438
1439	evlist->workload.pid = fork();
1440	if (evlist->workload.pid < 0) {
1441		perror("failed to fork");
1442		goto out_close_pipes;
1443	}
1444
1445	if (!evlist->workload.pid) {
1446		int ret;
1447
1448		if (pipe_output)
1449			dup2(2, 1);
1450
1451		signal(SIGTERM, SIG_DFL);
1452
1453		close(child_ready_pipe[0]);
1454		close(go_pipe[1]);
1455		fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1456
1457		/*
1458		 * Change the name of this process not to confuse --exclude-perf users
1459		 * that sees 'perf' in the window up to the execvp() and thinks that
1460		 * perf samples are not being excluded.
1461		 */
1462		prctl(PR_SET_NAME, "perf-exec");
1463
1464		/*
1465		 * Tell the parent we're ready to go
1466		 */
1467		close(child_ready_pipe[1]);
1468
1469		/*
1470		 * Wait until the parent tells us to go.
1471		 */
1472		ret = read(go_pipe[0], &bf, 1);
1473		/*
1474		 * The parent will ask for the execvp() to be performed by
1475		 * writing exactly one byte, in workload.cork_fd, usually via
1476		 * evlist__start_workload().
1477		 *
1478		 * For cancelling the workload without actually running it,
1479		 * the parent will just close workload.cork_fd, without writing
1480		 * anything, i.e. read will return zero and we just exit()
1481		 * here (See evlist__cancel_workload()).
1482		 */
1483		if (ret != 1) {
1484			if (ret == -1)
1485				perror("unable to read pipe");
1486			exit(ret);
1487		}
1488
1489		execvp(argv[0], (char **)argv);
1490
1491		if (exec_error) {
1492			union sigval val;
1493
1494			val.sival_int = errno;
1495			if (sigqueue(getppid(), SIGUSR1, val))
1496				perror(argv[0]);
1497		} else
1498			perror(argv[0]);
1499		exit(-1);
1500	}
1501
1502	if (exec_error) {
1503		struct sigaction act = {
1504			.sa_flags     = SA_SIGINFO,
1505			.sa_sigaction = exec_error,
1506		};
1507		sigaction(SIGUSR1, &act, NULL);
1508	}
1509
1510	if (target__none(target)) {
1511		if (evlist->core.threads == NULL) {
1512			fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1513				__func__, __LINE__);
1514			goto out_close_pipes;
1515		}
1516		perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1517	}
1518
1519	close(child_ready_pipe[1]);
1520	close(go_pipe[0]);
1521	/*
1522	 * wait for child to settle
1523	 */
1524	if (read(child_ready_pipe[0], &bf, 1) == -1) {
1525		perror("unable to read pipe");
1526		goto out_close_pipes;
1527	}
1528
1529	fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1530	evlist->workload.cork_fd = go_pipe[1];
1531	close(child_ready_pipe[0]);
1532	return 0;
1533
1534out_close_pipes:
1535	close(go_pipe[0]);
1536	close(go_pipe[1]);
1537out_close_ready_pipe:
1538	close(child_ready_pipe[0]);
1539	close(child_ready_pipe[1]);
1540	return -1;
1541}
1542
1543int evlist__start_workload(struct evlist *evlist)
1544{
1545	if (evlist->workload.cork_fd >= 0) {
1546		char bf = 0;
1547		int ret;
1548		/*
1549		 * Remove the cork, let it rip!
1550		 */
1551		ret = write(evlist->workload.cork_fd, &bf, 1);
1552		if (ret < 0)
1553			perror("unable to write to pipe");
1554
1555		close(evlist->workload.cork_fd);
1556		evlist->workload.cork_fd = -1;
1557		return ret;
1558	}
1559
1560	return 0;
1561}
1562
1563void evlist__cancel_workload(struct evlist *evlist)
1564{
1565	int status;
1566
1567	if (evlist->workload.cork_fd >= 0) {
1568		close(evlist->workload.cork_fd);
1569		evlist->workload.cork_fd = -1;
1570		waitpid(evlist->workload.pid, &status, WNOHANG);
1571	}
1572}
1573
1574int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
1575{
1576	struct evsel *evsel = evlist__event2evsel(evlist, event);
1577	int ret;
1578
1579	if (!evsel)
1580		return -EFAULT;
1581	ret = evsel__parse_sample(evsel, event, sample);
1582	if (ret)
1583		return ret;
1584	if (perf_guest && sample->id) {
1585		struct perf_sample_id *sid = evlist__id2sid(evlist, sample->id);
1586
1587		if (sid) {
1588			sample->machine_pid = sid->machine_pid;
1589			sample->vcpu = sid->vcpu.cpu;
1590		}
1591	}
1592	return 0;
1593}
1594
1595int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp)
1596{
1597	struct evsel *evsel = evlist__event2evsel(evlist, event);
1598
1599	if (!evsel)
1600		return -EFAULT;
1601	return evsel__parse_sample_timestamp(evsel, event, timestamp);
1602}
1603
1604int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
1605{
1606	int printed, value;
1607	char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1608
1609	switch (err) {
1610	case EACCES:
1611	case EPERM:
1612		printed = scnprintf(buf, size,
1613				    "Error:\t%s.\n"
1614				    "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1615
1616		value = perf_event_paranoid();
1617
1618		printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1619
1620		if (value >= 2) {
1621			printed += scnprintf(buf + printed, size - printed,
1622					     "For your workloads it needs to be <= 1\nHint:\t");
1623		}
1624		printed += scnprintf(buf + printed, size - printed,
1625				     "For system wide tracing it needs to be set to -1.\n");
1626
1627		printed += scnprintf(buf + printed, size - printed,
1628				    "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1629				    "Hint:\tThe current value is %d.", value);
1630		break;
1631	case EINVAL: {
1632		struct evsel *first = evlist__first(evlist);
1633		int max_freq;
1634
1635		if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1636			goto out_default;
1637
1638		if (first->core.attr.sample_freq < (u64)max_freq)
1639			goto out_default;
1640
1641		printed = scnprintf(buf, size,
1642				    "Error:\t%s.\n"
1643				    "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1644				    "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1645				    emsg, max_freq, first->core.attr.sample_freq);
1646		break;
1647	}
1648	default:
1649out_default:
1650		scnprintf(buf, size, "%s", emsg);
1651		break;
1652	}
1653
1654	return 0;
1655}
1656
1657int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1658{
1659	char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1660	int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1661
1662	switch (err) {
1663	case EPERM:
1664		sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1665		printed += scnprintf(buf + printed, size - printed,
1666				     "Error:\t%s.\n"
1667				     "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1668				     "Hint:\tTried using %zd kB.\n",
1669				     emsg, pages_max_per_user, pages_attempted);
1670
1671		if (pages_attempted >= pages_max_per_user) {
1672			printed += scnprintf(buf + printed, size - printed,
1673					     "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1674					     pages_max_per_user + pages_attempted);
1675		}
1676
1677		printed += scnprintf(buf + printed, size - printed,
1678				     "Hint:\tTry using a smaller -m/--mmap-pages value.");
1679		break;
1680	default:
1681		scnprintf(buf, size, "%s", emsg);
1682		break;
1683	}
1684
1685	return 0;
1686}
1687
1688void evlist__to_front(struct evlist *evlist, struct evsel *move_evsel)
1689{
1690	struct evsel *evsel, *n;
1691	LIST_HEAD(move);
1692
1693	if (move_evsel == evlist__first(evlist))
1694		return;
1695
1696	evlist__for_each_entry_safe(evlist, n, evsel) {
1697		if (evsel__leader(evsel) == evsel__leader(move_evsel))
1698			list_move_tail(&evsel->core.node, &move);
1699	}
1700
1701	list_splice(&move, &evlist->core.entries);
1702}
1703
1704struct evsel *evlist__get_tracking_event(struct evlist *evlist)
1705{
1706	struct evsel *evsel;
1707
1708	evlist__for_each_entry(evlist, evsel) {
1709		if (evsel->tracking)
1710			return evsel;
1711	}
1712
1713	return evlist__first(evlist);
1714}
1715
1716void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_evsel)
1717{
1718	struct evsel *evsel;
1719
1720	if (tracking_evsel->tracking)
1721		return;
1722
1723	evlist__for_each_entry(evlist, evsel) {
1724		if (evsel != tracking_evsel)
1725			evsel->tracking = false;
1726	}
1727
1728	tracking_evsel->tracking = true;
1729}
1730
1731struct evsel *evlist__findnew_tracking_event(struct evlist *evlist, bool system_wide)
1732{
1733	struct evsel *evsel;
1734
1735	evsel = evlist__get_tracking_event(evlist);
1736	if (!evsel__is_dummy_event(evsel)) {
1737		evsel = evlist__add_aux_dummy(evlist, system_wide);
1738		if (!evsel)
1739			return NULL;
1740
1741		evlist__set_tracking_event(evlist, evsel);
1742	} else if (system_wide) {
1743		perf_evlist__go_system_wide(&evlist->core, &evsel->core);
1744	}
1745
1746	return evsel;
1747}
1748
1749struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str)
1750{
1751	struct evsel *evsel;
1752
1753	evlist__for_each_entry(evlist, evsel) {
1754		if (!evsel->name)
1755			continue;
1756		if (evsel__name_is(evsel, str))
1757			return evsel;
1758	}
1759
1760	return NULL;
1761}
1762
1763void evlist__toggle_bkw_mmap(struct evlist *evlist, enum bkw_mmap_state state)
1764{
1765	enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1766	enum action {
1767		NONE,
1768		PAUSE,
1769		RESUME,
1770	} action = NONE;
1771
1772	if (!evlist->overwrite_mmap)
1773		return;
1774
1775	switch (old_state) {
1776	case BKW_MMAP_NOTREADY: {
1777		if (state != BKW_MMAP_RUNNING)
1778			goto state_err;
1779		break;
1780	}
1781	case BKW_MMAP_RUNNING: {
1782		if (state != BKW_MMAP_DATA_PENDING)
1783			goto state_err;
1784		action = PAUSE;
1785		break;
1786	}
1787	case BKW_MMAP_DATA_PENDING: {
1788		if (state != BKW_MMAP_EMPTY)
1789			goto state_err;
1790		break;
1791	}
1792	case BKW_MMAP_EMPTY: {
1793		if (state != BKW_MMAP_RUNNING)
1794			goto state_err;
1795		action = RESUME;
1796		break;
1797	}
1798	default:
1799		WARN_ONCE(1, "Shouldn't get there\n");
1800	}
1801
1802	evlist->bkw_mmap_state = state;
1803
1804	switch (action) {
1805	case PAUSE:
1806		evlist__pause(evlist);
1807		break;
1808	case RESUME:
1809		evlist__resume(evlist);
1810		break;
1811	case NONE:
1812	default:
1813		break;
1814	}
1815
1816state_err:
1817	return;
1818}
1819
1820bool evlist__exclude_kernel(struct evlist *evlist)
1821{
1822	struct evsel *evsel;
1823
1824	evlist__for_each_entry(evlist, evsel) {
1825		if (!evsel->core.attr.exclude_kernel)
1826			return false;
1827	}
1828
1829	return true;
1830}
1831
1832/*
1833 * Events in data file are not collect in groups, but we still want
1834 * the group display. Set the artificial group and set the leader's
1835 * forced_leader flag to notify the display code.
1836 */
1837void evlist__force_leader(struct evlist *evlist)
1838{
1839	if (evlist__nr_groups(evlist) == 0) {
1840		struct evsel *leader = evlist__first(evlist);
1841
1842		evlist__set_leader(evlist);
1843		leader->forced_leader = true;
1844	}
1845}
1846
1847struct evsel *evlist__reset_weak_group(struct evlist *evsel_list, struct evsel *evsel, bool close)
1848{
1849	struct evsel *c2, *leader;
1850	bool is_open = true;
1851
1852	leader = evsel__leader(evsel);
1853
1854	pr_debug("Weak group for %s/%d failed\n",
1855			leader->name, leader->core.nr_members);
1856
1857	/*
1858	 * for_each_group_member doesn't work here because it doesn't
1859	 * include the first entry.
1860	 */
1861	evlist__for_each_entry(evsel_list, c2) {
1862		if (c2 == evsel)
1863			is_open = false;
1864		if (evsel__has_leader(c2, leader)) {
1865			if (is_open && close)
1866				perf_evsel__close(&c2->core);
1867			/*
1868			 * We want to close all members of the group and reopen
1869			 * them. Some events, like Intel topdown, require being
1870			 * in a group and so keep these in the group.
1871			 */
1872			evsel__remove_from_group(c2, leader);
1873
1874			/*
1875			 * Set this for all former members of the group
1876			 * to indicate they get reopened.
1877			 */
1878			c2->reset_group = true;
1879		}
1880	}
1881	/* Reset the leader count if all entries were removed. */
1882	if (leader->core.nr_members == 1)
1883		leader->core.nr_members = 0;
1884	return leader;
1885}
1886
1887static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1888{
1889	char *s, *p;
1890	int ret = 0, fd;
1891
1892	if (strncmp(str, "fifo:", 5))
1893		return -EINVAL;
1894
1895	str += 5;
1896	if (!*str || *str == ',')
1897		return -EINVAL;
1898
1899	s = strdup(str);
1900	if (!s)
1901		return -ENOMEM;
1902
1903	p = strchr(s, ',');
1904	if (p)
1905		*p = '\0';
1906
1907	/*
1908	 * O_RDWR avoids POLLHUPs which is necessary to allow the other
1909	 * end of a FIFO to be repeatedly opened and closed.
1910	 */
1911	fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1912	if (fd < 0) {
1913		pr_err("Failed to open '%s'\n", s);
1914		ret = -errno;
1915		goto out_free;
1916	}
1917	*ctl_fd = fd;
1918	*ctl_fd_close = true;
1919
1920	if (p && *++p) {
1921		/* O_RDWR | O_NONBLOCK means the other end need not be open */
1922		fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1923		if (fd < 0) {
1924			pr_err("Failed to open '%s'\n", p);
1925			ret = -errno;
1926			goto out_free;
1927		}
1928		*ctl_fd_ack = fd;
1929	}
1930
1931out_free:
1932	free(s);
1933	return ret;
1934}
1935
1936int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1937{
1938	char *comma = NULL, *endptr = NULL;
1939
1940	*ctl_fd_close = false;
1941
1942	if (strncmp(str, "fd:", 3))
1943		return evlist__parse_control_fifo(str, ctl_fd, ctl_fd_ack, ctl_fd_close);
1944
1945	*ctl_fd = strtoul(&str[3], &endptr, 0);
1946	if (endptr == &str[3])
1947		return -EINVAL;
1948
1949	comma = strchr(str, ',');
1950	if (comma) {
1951		if (endptr != comma)
1952			return -EINVAL;
1953
1954		*ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
1955		if (endptr == comma + 1 || *endptr != '\0')
1956			return -EINVAL;
1957	}
1958
1959	return 0;
1960}
1961
1962void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close)
1963{
1964	if (*ctl_fd_close) {
1965		*ctl_fd_close = false;
1966		close(ctl_fd);
1967		if (ctl_fd_ack >= 0)
1968			close(ctl_fd_ack);
1969	}
1970}
1971
1972int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
1973{
1974	if (fd == -1) {
1975		pr_debug("Control descriptor is not initialized\n");
1976		return 0;
1977	}
1978
1979	evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
1980						     fdarray_flag__nonfilterable |
1981						     fdarray_flag__non_perf_event);
1982	if (evlist->ctl_fd.pos < 0) {
1983		evlist->ctl_fd.pos = -1;
1984		pr_err("Failed to add ctl fd entry: %m\n");
1985		return -1;
1986	}
1987
1988	evlist->ctl_fd.fd = fd;
1989	evlist->ctl_fd.ack = ack;
1990
1991	return 0;
1992}
1993
1994bool evlist__ctlfd_initialized(struct evlist *evlist)
1995{
1996	return evlist->ctl_fd.pos >= 0;
1997}
1998
1999int evlist__finalize_ctlfd(struct evlist *evlist)
2000{
2001	struct pollfd *entries = evlist->core.pollfd.entries;
2002
2003	if (!evlist__ctlfd_initialized(evlist))
2004		return 0;
2005
2006	entries[evlist->ctl_fd.pos].fd = -1;
2007	entries[evlist->ctl_fd.pos].events = 0;
2008	entries[evlist->ctl_fd.pos].revents = 0;
2009
2010	evlist->ctl_fd.pos = -1;
2011	evlist->ctl_fd.ack = -1;
2012	evlist->ctl_fd.fd = -1;
2013
2014	return 0;
2015}
2016
2017static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
2018			      char *cmd_data, size_t data_size)
2019{
2020	int err;
2021	char c;
2022	size_t bytes_read = 0;
2023
2024	*cmd = EVLIST_CTL_CMD_UNSUPPORTED;
2025	memset(cmd_data, 0, data_size);
2026	data_size--;
2027
2028	do {
2029		err = read(evlist->ctl_fd.fd, &c, 1);
2030		if (err > 0) {
2031			if (c == '\n' || c == '\0')
2032				break;
2033			cmd_data[bytes_read++] = c;
2034			if (bytes_read == data_size)
2035				break;
2036			continue;
2037		} else if (err == -1) {
2038			if (errno == EINTR)
2039				continue;
2040			if (errno == EAGAIN || errno == EWOULDBLOCK)
2041				err = 0;
2042			else
2043				pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
2044		}
2045		break;
2046	} while (1);
2047
2048	pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
2049		 bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
2050
2051	if (bytes_read > 0) {
2052		if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
2053			     (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
2054			*cmd = EVLIST_CTL_CMD_ENABLE;
2055		} else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
2056				    (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) {
2057			*cmd = EVLIST_CTL_CMD_DISABLE;
2058		} else if (!strncmp(cmd_data, EVLIST_CTL_CMD_SNAPSHOT_TAG,
2059				    (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
2060			*cmd = EVLIST_CTL_CMD_SNAPSHOT;
2061			pr_debug("is snapshot\n");
2062		} else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG,
2063				    (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) {
2064			*cmd = EVLIST_CTL_CMD_EVLIST;
2065		} else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG,
2066				    (sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) {
2067			*cmd = EVLIST_CTL_CMD_STOP;
2068		} else if (!strncmp(cmd_data, EVLIST_CTL_CMD_PING_TAG,
2069				    (sizeof(EVLIST_CTL_CMD_PING_TAG)-1))) {
2070			*cmd = EVLIST_CTL_CMD_PING;
2071		}
2072	}
2073
2074	return bytes_read ? (int)bytes_read : err;
2075}
2076
2077int evlist__ctlfd_ack(struct evlist *evlist)
2078{
2079	int err;
2080
2081	if (evlist->ctl_fd.ack == -1)
2082		return 0;
2083
2084	err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG,
2085		    sizeof(EVLIST_CTL_CMD_ACK_TAG));
2086	if (err == -1)
2087		pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack);
2088
2089	return err;
2090}
2091
2092static int get_cmd_arg(char *cmd_data, size_t cmd_size, char **arg)
2093{
2094	char *data = cmd_data + cmd_size;
2095
2096	/* no argument */
2097	if (!*data)
2098		return 0;
2099
2100	/* there's argument */
2101	if (*data == ' ') {
2102		*arg = data + 1;
2103		return 1;
2104	}
2105
2106	/* malformed */
2107	return -1;
2108}
2109
2110static int evlist__ctlfd_enable(struct evlist *evlist, char *cmd_data, bool enable)
2111{
2112	struct evsel *evsel;
2113	char *name;
2114	int err;
2115
2116	err = get_cmd_arg(cmd_data,
2117			  enable ? sizeof(EVLIST_CTL_CMD_ENABLE_TAG) - 1 :
2118				   sizeof(EVLIST_CTL_CMD_DISABLE_TAG) - 1,
2119			  &name);
2120	if (err < 0) {
2121		pr_info("failed: wrong command\n");
2122		return -1;
2123	}
2124
2125	if (err) {
2126		evsel = evlist__find_evsel_by_str(evlist, name);
2127		if (evsel) {
2128			if (enable)
2129				evlist__enable_evsel(evlist, name);
2130			else
2131				evlist__disable_evsel(evlist, name);
2132			pr_info("Event %s %s\n", evsel->name,
2133				enable ? "enabled" : "disabled");
2134		} else {
2135			pr_info("failed: can't find '%s' event\n", name);
2136		}
2137	} else {
2138		if (enable) {
2139			evlist__enable(evlist);
2140			pr_info(EVLIST_ENABLED_MSG);
2141		} else {
2142			evlist__disable(evlist);
2143			pr_info(EVLIST_DISABLED_MSG);
2144		}
2145	}
2146
2147	return 0;
2148}
2149
2150static int evlist__ctlfd_list(struct evlist *evlist, char *cmd_data)
2151{
2152	struct perf_attr_details details = { .verbose = false, };
2153	struct evsel *evsel;
2154	char *arg;
2155	int err;
2156
2157	err = get_cmd_arg(cmd_data,
2158			  sizeof(EVLIST_CTL_CMD_EVLIST_TAG) - 1,
2159			  &arg);
2160	if (err < 0) {
2161		pr_info("failed: wrong command\n");
2162		return -1;
2163	}
2164
2165	if (err) {
2166		if (!strcmp(arg, "-v")) {
2167			details.verbose = true;
2168		} else if (!strcmp(arg, "-g")) {
2169			details.event_group = true;
2170		} else if (!strcmp(arg, "-F")) {
2171			details.freq = true;
2172		} else {
2173			pr_info("failed: wrong command\n");
2174			return -1;
2175		}
2176	}
2177
2178	evlist__for_each_entry(evlist, evsel)
2179		evsel__fprintf(evsel, &details, stderr);
2180
2181	return 0;
2182}
2183
2184int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
2185{
2186	int err = 0;
2187	char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
2188	int ctlfd_pos = evlist->ctl_fd.pos;
2189	struct pollfd *entries = evlist->core.pollfd.entries;
2190
2191	if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
2192		return 0;
2193
2194	if (entries[ctlfd_pos].revents & POLLIN) {
2195		err = evlist__ctlfd_recv(evlist, cmd, cmd_data,
2196					 EVLIST_CTL_CMD_MAX_LEN);
2197		if (err > 0) {
2198			switch (*cmd) {
2199			case EVLIST_CTL_CMD_ENABLE:
2200			case EVLIST_CTL_CMD_DISABLE:
2201				err = evlist__ctlfd_enable(evlist, cmd_data,
2202							   *cmd == EVLIST_CTL_CMD_ENABLE);
2203				break;
2204			case EVLIST_CTL_CMD_EVLIST:
2205				err = evlist__ctlfd_list(evlist, cmd_data);
2206				break;
2207			case EVLIST_CTL_CMD_SNAPSHOT:
2208			case EVLIST_CTL_CMD_STOP:
2209			case EVLIST_CTL_CMD_PING:
2210				break;
2211			case EVLIST_CTL_CMD_ACK:
2212			case EVLIST_CTL_CMD_UNSUPPORTED:
2213			default:
2214				pr_debug("ctlfd: unsupported %d\n", *cmd);
2215				break;
2216			}
2217			if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED ||
2218			      *cmd == EVLIST_CTL_CMD_SNAPSHOT))
2219				evlist__ctlfd_ack(evlist);
2220		}
2221	}
2222
2223	if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR))
2224		evlist__finalize_ctlfd(evlist);
2225	else
2226		entries[ctlfd_pos].revents = 0;
2227
2228	return err;
2229}
2230
2231/**
2232 * struct event_enable_time - perf record -D/--delay single time range.
2233 * @start: start of time range to enable events in milliseconds
2234 * @end: end of time range to enable events in milliseconds
2235 *
2236 * N.B. this structure is also accessed as an array of int.
2237 */
2238struct event_enable_time {
2239	int	start;
2240	int	end;
2241};
2242
2243static int parse_event_enable_time(const char *str, struct event_enable_time *range, bool first)
2244{
2245	const char *fmt = first ? "%u - %u %n" : " , %u - %u %n";
2246	int ret, start, end, n;
2247
2248	ret = sscanf(str, fmt, &start, &end, &n);
2249	if (ret != 2 || end <= start)
2250		return -EINVAL;
2251	if (range) {
2252		range->start = start;
2253		range->end = end;
2254	}
2255	return n;
2256}
2257
2258static ssize_t parse_event_enable_times(const char *str, struct event_enable_time *range)
2259{
2260	int incr = !!range;
2261	bool first = true;
2262	ssize_t ret, cnt;
2263
2264	for (cnt = 0; *str; cnt++) {
2265		ret = parse_event_enable_time(str, range, first);
2266		if (ret < 0)
2267			return ret;
2268		/* Check no overlap */
2269		if (!first && range && range->start <= range[-1].end)
2270			return -EINVAL;
2271		str += ret;
2272		range += incr;
2273		first = false;
2274	}
2275	return cnt;
2276}
2277
2278/**
2279 * struct event_enable_timer - control structure for perf record -D/--delay.
2280 * @evlist: event list
2281 * @times: time ranges that events are enabled (N.B. this is also accessed as an
2282 *         array of int)
2283 * @times_cnt: number of time ranges
2284 * @timerfd: timer file descriptor
2285 * @pollfd_pos: position in @evlist array of file descriptors to poll (fdarray)
2286 * @times_step: current position in (int *)@times)[],
2287 *              refer event_enable_timer__process()
2288 *
2289 * Note, this structure is only used when there are time ranges, not when there
2290 * is only an initial delay.
2291 */
2292struct event_enable_timer {
2293	struct evlist *evlist;
2294	struct event_enable_time *times;
2295	size_t	times_cnt;
2296	int	timerfd;
2297	int	pollfd_pos;
2298	size_t	times_step;
2299};
2300
2301static int str_to_delay(const char *str)
2302{
2303	char *endptr;
2304	long d;
2305
2306	d = strtol(str, &endptr, 10);
2307	if (*endptr || d > INT_MAX || d < -1)
2308		return 0;
2309	return d;
2310}
2311
2312int evlist__parse_event_enable_time(struct evlist *evlist, struct record_opts *opts,
2313				    const char *str, int unset)
2314{
2315	enum fdarray_flags flags = fdarray_flag__nonfilterable | fdarray_flag__non_perf_event;
2316	struct event_enable_timer *eet;
2317	ssize_t times_cnt;
2318	ssize_t ret;
2319	int err;
2320
2321	if (unset)
2322		return 0;
2323
2324	opts->target.initial_delay = str_to_delay(str);
2325	if (opts->target.initial_delay)
2326		return 0;
2327
2328	ret = parse_event_enable_times(str, NULL);
2329	if (ret < 0)
2330		return ret;
2331
2332	times_cnt = ret;
2333	if (times_cnt == 0)
2334		return -EINVAL;
2335
2336	eet = zalloc(sizeof(*eet));
2337	if (!eet)
2338		return -ENOMEM;
2339
2340	eet->times = calloc(times_cnt, sizeof(*eet->times));
2341	if (!eet->times) {
2342		err = -ENOMEM;
2343		goto free_eet;
2344	}
2345
2346	if (parse_event_enable_times(str, eet->times) != times_cnt) {
2347		err = -EINVAL;
2348		goto free_eet_times;
2349	}
2350
2351	eet->times_cnt = times_cnt;
2352
2353	eet->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
2354	if (eet->timerfd == -1) {
2355		err = -errno;
2356		pr_err("timerfd_create failed: %s\n", strerror(errno));
2357		goto free_eet_times;
2358	}
2359
2360	eet->pollfd_pos = perf_evlist__add_pollfd(&evlist->core, eet->timerfd, NULL, POLLIN, flags);
2361	if (eet->pollfd_pos < 0) {
2362		err = eet->pollfd_pos;
2363		goto close_timerfd;
2364	}
2365
2366	eet->evlist = evlist;
2367	evlist->eet = eet;
2368	opts->target.initial_delay = eet->times[0].start;
2369
2370	return 0;
2371
2372close_timerfd:
2373	close(eet->timerfd);
2374free_eet_times:
2375	zfree(&eet->times);
2376free_eet:
2377	free(eet);
2378	return err;
2379}
2380
2381static int event_enable_timer__set_timer(struct event_enable_timer *eet, int ms)
2382{
2383	struct itimerspec its = {
2384		.it_value.tv_sec = ms / MSEC_PER_SEC,
2385		.it_value.tv_nsec = (ms % MSEC_PER_SEC) * NSEC_PER_MSEC,
2386	};
2387	int err = 0;
2388
2389	if (timerfd_settime(eet->timerfd, 0, &its, NULL) < 0) {
2390		err = -errno;
2391		pr_err("timerfd_settime failed: %s\n", strerror(errno));
2392	}
2393	return err;
2394}
2395
2396int event_enable_timer__start(struct event_enable_timer *eet)
2397{
2398	int ms;
2399
2400	if (!eet)
2401		return 0;
2402
2403	ms = eet->times[0].end - eet->times[0].start;
2404	eet->times_step = 1;
2405
2406	return event_enable_timer__set_timer(eet, ms);
2407}
2408
2409int event_enable_timer__process(struct event_enable_timer *eet)
2410{
2411	struct pollfd *entries;
2412	short revents;
2413
2414	if (!eet)
2415		return 0;
2416
2417	entries = eet->evlist->core.pollfd.entries;
2418	revents = entries[eet->pollfd_pos].revents;
2419	entries[eet->pollfd_pos].revents = 0;
2420
2421	if (revents & POLLIN) {
2422		size_t step = eet->times_step;
2423		size_t pos = step / 2;
2424
2425		if (step & 1) {
2426			evlist__disable_non_dummy(eet->evlist);
2427			pr_info(EVLIST_DISABLED_MSG);
2428			if (pos >= eet->times_cnt - 1) {
2429				/* Disarm timer */
2430				event_enable_timer__set_timer(eet, 0);
2431				return 1; /* Stop */
2432			}
2433		} else {
2434			evlist__enable_non_dummy(eet->evlist);
2435			pr_info(EVLIST_ENABLED_MSG);
2436		}
2437
2438		step += 1;
2439		pos = step / 2;
2440
2441		if (pos < eet->times_cnt) {
2442			int *times = (int *)eet->times; /* Accessing 'times' as array of int */
2443			int ms = times[step] - times[step - 1];
2444
2445			eet->times_step = step;
2446			return event_enable_timer__set_timer(eet, ms);
2447		}
2448	}
2449
2450	return 0;
2451}
2452
2453void event_enable_timer__exit(struct event_enable_timer **ep)
2454{
2455	if (!ep || !*ep)
2456		return;
2457	zfree(&(*ep)->times);
2458	zfree(ep);
2459}
2460
2461struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
2462{
2463	struct evsel *evsel;
2464
2465	evlist__for_each_entry(evlist, evsel) {
2466		if (evsel->core.idx == idx)
2467			return evsel;
2468	}
2469	return NULL;
2470}
2471
2472int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf)
2473{
2474	struct evsel *evsel;
2475	int printed = 0;
2476
2477	evlist__for_each_entry(evlist, evsel) {
2478		if (evsel__is_dummy_event(evsel))
2479			continue;
2480		if (size > (strlen(evsel__name(evsel)) + (printed ? 2 : 1))) {
2481			printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "," : "", evsel__name(evsel));
2482		} else {
2483			printed += scnprintf(bf + printed, size - printed, "%s...", printed ? "," : "");
2484			break;
2485		}
2486	}
2487
2488	return printed;
2489}
2490
2491void evlist__check_mem_load_aux(struct evlist *evlist)
2492{
2493	struct evsel *leader, *evsel, *pos;
2494
2495	/*
2496	 * For some platforms, the 'mem-loads' event is required to use
2497	 * together with 'mem-loads-aux' within a group and 'mem-loads-aux'
2498	 * must be the group leader. Now we disable this group before reporting
2499	 * because 'mem-loads-aux' is just an auxiliary event. It doesn't carry
2500	 * any valid memory load information.
2501	 */
2502	evlist__for_each_entry(evlist, evsel) {
2503		leader = evsel__leader(evsel);
2504		if (leader == evsel)
2505			continue;
2506
2507		if (leader->name && strstr(leader->name, "mem-loads-aux")) {
2508			for_each_group_evsel(pos, leader) {
2509				evsel__set_leader(pos, pos);
2510				pos->core.nr_members = 0;
2511			}
2512		}
2513	}
2514}
2515
2516/**
2517 * evlist__warn_user_requested_cpus() - Check each evsel against requested CPUs
2518 *     and warn if the user CPU list is inapplicable for the event's PMU's
2519 *     CPUs. Not core PMUs list a CPU in sysfs, but this may be overwritten by a
2520 *     user requested CPU and so any online CPU is applicable. Core PMUs handle
2521 *     events on the CPUs in their list and otherwise the event isn't supported.
2522 * @evlist: The list of events being checked.
2523 * @cpu_list: The user provided list of CPUs.
2524 */
2525void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_list)
2526{
2527	struct perf_cpu_map *user_requested_cpus;
2528	struct evsel *pos;
2529
2530	if (!cpu_list)
2531		return;
2532
2533	user_requested_cpus = perf_cpu_map__new(cpu_list);
2534	if (!user_requested_cpus)
2535		return;
2536
2537	evlist__for_each_entry(evlist, pos) {
2538		struct perf_cpu_map *intersect, *to_test;
2539		const struct perf_pmu *pmu = evsel__find_pmu(pos);
2540
2541		to_test = pmu && pmu->is_core ? pmu->cpus : cpu_map__online();
2542		intersect = perf_cpu_map__intersect(to_test, user_requested_cpus);
2543		if (!perf_cpu_map__equal(intersect, user_requested_cpus)) {
2544			char buf[128];
2545
2546			cpu_map__snprint(to_test, buf, sizeof(buf));
2547			pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n",
2548				cpu_list, pmu ? pmu->name : "cpu", buf, evsel__name(pos));
2549		}
2550		perf_cpu_map__put(intersect);
2551	}
2552	perf_cpu_map__put(user_requested_cpus);
2553}
2554
2555void evlist__uniquify_name(struct evlist *evlist)
2556{
2557	char *new_name, empty_attributes[2] = ":", *attributes;
2558	struct evsel *pos;
2559
2560	if (perf_pmus__num_core_pmus() == 1)
2561		return;
2562
2563	evlist__for_each_entry(evlist, pos) {
2564		if (!evsel__is_hybrid(pos))
2565			continue;
2566
2567		if (strchr(pos->name, '/'))
2568			continue;
2569
2570		attributes = strchr(pos->name, ':');
2571		if (attributes)
2572			*attributes = '\0';
2573		else
2574			attributes = empty_attributes;
2575
2576		if (asprintf(&new_name, "%s/%s/%s", pos->pmu ? pos->pmu->name : "",
2577			     pos->name, attributes + 1)) {
2578			free(pos->name);
2579			pos->name = new_name;
2580		} else {
2581			*attributes = ':';
2582		}
2583	}
2584}
2585
2586bool evlist__has_bpf_output(struct evlist *evlist)
2587{
2588	struct evsel *evsel;
2589
2590	evlist__for_each_entry(evlist, evsel) {
2591		if (evsel__is_bpf_output(evsel))
2592			return true;
2593	}
2594
2595	return false;
2596}