evsel.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/*
   9 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
  10 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
  11 */
  12#define __SANE_USERSPACE_TYPES__
  13
  14#include <byteswap.h>
  15#include <errno.h>
  16#include <inttypes.h>
  17#include <linux/bitops.h>
  18#include <api/fs/fs.h>
  19#include <api/fs/tracing_path.h>
  20#include <linux/hw_breakpoint.h>
  21#include <linux/perf_event.h>
  22#include <linux/compiler.h>
  23#include <linux/err.h>
  24#include <linux/zalloc.h>
  25#include <sys/ioctl.h>
  26#include <sys/resource.h>
  27#include <sys/syscall.h>
  28#include <sys/types.h>
  29#include <dirent.h>
  30#include <stdlib.h>
  31#include <perf/evsel.h>
  32#include "asm/bug.h"
  33#include "bpf_counter.h"
  34#include "callchain.h"
  35#include "cgroup.h"
  36#include "counts.h"
  37#include "event.h"
  38#include "evsel.h"
  39#include "time-utils.h"
  40#include "util/env.h"
  41#include "util/evsel_config.h"
  42#include "util/evsel_fprintf.h"
  43#include "evlist.h"
  44#include <perf/cpumap.h>
  45#include "thread_map.h"
  46#include "target.h"
  47#include "perf_regs.h"
  48#include "record.h"
  49#include "debug.h"
  50#include "trace-event.h"
  51#include "session.h"
  52#include "stat.h"
  53#include "string2.h"
  54#include "memswap.h"
  55#include "util.h"
  56#include "util/hashmap.h"
  57#include "off_cpu.h"
  58#include "pmu.h"
  59#include "pmus.h"
  60#include "drm_pmu.h"
  61#include "hwmon_pmu.h"
  62#include "tool_pmu.h"
  63#include "tp_pmu.h"
  64#include "rlimit.h"
  65#include "../perf-sys.h"
  66#include "util/parse-branch-options.h"
  67#include "util/bpf-filter.h"
  68#include "util/hist.h"
  69#include <internal/xyarray.h>
  70#include <internal/lib.h>
  71#include <internal/threadmap.h>
  72#include "util/intel-tpebs.h"
  73
  74#include <linux/ctype.h>
  75
  76#ifdef HAVE_LIBTRACEEVENT
  77#include <event-parse.h>
  78#endif
  79
  80struct perf_missing_features perf_missing_features;
  81
  82static clockid_t clockid;
  83
  84static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
  85{
  86	return 0;
  87}
  88
  89static bool test_attr__enabled(void)
  90{
  91	static bool test_attr__enabled;
  92	static bool test_attr__enabled_tested;
  93
  94	if (!test_attr__enabled_tested) {
  95		char *dir = getenv("PERF_TEST_ATTR");
  96
  97		test_attr__enabled = (dir != NULL);
  98		test_attr__enabled_tested = true;
  99	}
 100	return test_attr__enabled;
 101}
 102
 103#define __WRITE_ASS(str, fmt, data)					\
 104do {									\
 105	if (fprintf(file, #str "=%"fmt "\n", data) < 0) {		\
 106		perror("test attr - failed to write event file");	\
 107		fclose(file);						\
 108		return -1;						\
 109	}								\
 110} while (0)
 111
 112#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
 113
 114static int store_event(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,
 115		       int fd, int group_fd, unsigned long flags)
 116{
 117	FILE *file;
 118	char path[PATH_MAX];
 119	char *dir = getenv("PERF_TEST_ATTR");
 120
 121	snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
 122		 attr->type, attr->config, fd);
 123
 124	file = fopen(path, "w+");
 125	if (!file) {
 126		perror("test attr - failed to open event file");
 127		return -1;
 128	}
 129
 130	if (fprintf(file, "[event-%d-%llu-%d]\n",
 131		    attr->type, attr->config, fd) < 0) {
 132		perror("test attr - failed to write event file");
 133		fclose(file);
 134		return -1;
 135	}
 136
 137	/* syscall arguments */
 138	__WRITE_ASS(fd,       "d", fd);
 139	__WRITE_ASS(group_fd, "d", group_fd);
 140	__WRITE_ASS(cpu,      "d", cpu.cpu);
 141	__WRITE_ASS(pid,      "d", pid);
 142	__WRITE_ASS(flags,   "lu", flags);
 143
 144	/* struct perf_event_attr */
 145	WRITE_ASS(type,   PRIu32);
 146	WRITE_ASS(size,   PRIu32);
 147	WRITE_ASS(config,  "llu");
 148	WRITE_ASS(sample_period, "llu");
 149	WRITE_ASS(sample_type,   "llu");
 150	WRITE_ASS(read_format,   "llu");
 151	WRITE_ASS(disabled,       "d");
 152	WRITE_ASS(inherit,        "d");
 153	WRITE_ASS(pinned,         "d");
 154	WRITE_ASS(exclusive,      "d");
 155	WRITE_ASS(exclude_user,   "d");
 156	WRITE_ASS(exclude_kernel, "d");
 157	WRITE_ASS(exclude_hv,     "d");
 158	WRITE_ASS(exclude_idle,   "d");
 159	WRITE_ASS(mmap,           "d");
 160	WRITE_ASS(comm,           "d");
 161	WRITE_ASS(freq,           "d");
 162	WRITE_ASS(inherit_stat,   "d");
 163	WRITE_ASS(enable_on_exec, "d");
 164	WRITE_ASS(task,           "d");
 165	WRITE_ASS(watermark,      "d");
 166	WRITE_ASS(precise_ip,     "d");
 167	WRITE_ASS(mmap_data,      "d");
 168	WRITE_ASS(sample_id_all,  "d");
 169	WRITE_ASS(exclude_host,   "d");
 170	WRITE_ASS(exclude_guest,  "d");
 171	WRITE_ASS(exclude_callchain_kernel, "d");
 172	WRITE_ASS(exclude_callchain_user, "d");
 173	WRITE_ASS(mmap2,	  "d");
 174	WRITE_ASS(comm_exec,	  "d");
 175	WRITE_ASS(context_switch, "d");
 176	WRITE_ASS(write_backward, "d");
 177	WRITE_ASS(namespaces,	  "d");
 178	WRITE_ASS(use_clockid,    "d");
 179	WRITE_ASS(wakeup_events, PRIu32);
 180	WRITE_ASS(bp_type, PRIu32);
 181	WRITE_ASS(config1, "llu");
 182	WRITE_ASS(config2, "llu");
 183	WRITE_ASS(branch_sample_type, "llu");
 184	WRITE_ASS(sample_regs_user,   "llu");
 185	WRITE_ASS(sample_stack_user,  PRIu32);
 186
 187	fclose(file);
 188	return 0;
 189}
 190
 191#undef __WRITE_ASS
 192#undef WRITE_ASS
 193
 194static void test_attr__open(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,
 195		     int fd, int group_fd, unsigned long flags)
 196{
 197	int errno_saved = errno;
 198
 199	if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {
 200		pr_err("test attr FAILED");
 201		exit(128);
 202	}
 203
 204	errno = errno_saved;
 205}
 206
 207static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
 208{
 209}
 210
 211static struct {
 212	size_t	size;
 213	int	(*init)(struct evsel *evsel);
 214	void	(*fini)(struct evsel *evsel);
 215} perf_evsel__object = {
 216	.size = sizeof(struct evsel),
 217	.init = evsel__no_extra_init,
 218	.fini = evsel__no_extra_fini,
 219};
 220
 221int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel),
 222			 void (*fini)(struct evsel *evsel))
 223{
 224
 225	if (object_size == 0)
 226		goto set_methods;
 227
 228	if (perf_evsel__object.size > object_size)
 229		return -EINVAL;
 230
 231	perf_evsel__object.size = object_size;
 232
 233set_methods:
 234	if (init != NULL)
 235		perf_evsel__object.init = init;
 236
 237	if (fini != NULL)
 238		perf_evsel__object.fini = fini;
 239
 240	return 0;
 241}
 242
 243const char *evsel__pmu_name(const struct evsel *evsel)
 244{
 245	struct perf_pmu *pmu = evsel__find_pmu(evsel);
 246
 247	if (pmu)
 248		return pmu->name;
 249
 250	return event_type(evsel->core.attr.type);
 251}
 252
 253#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
 254
 255int __evsel__sample_size(u64 sample_type)
 256{
 257	u64 mask = sample_type & PERF_SAMPLE_MASK;
 258	int size = 0;
 259	int i;
 260
 261	for (i = 0; i < 64; i++) {
 262		if (mask & (1ULL << i))
 263			size++;
 264	}
 265
 266	size *= sizeof(u64);
 267
 268	return size;
 269}
 270
 271/**
 272 * __perf_evsel__calc_id_pos - calculate id_pos.
 273 * @sample_type: sample type
 274 *
 275 * This function returns the position of the event id (PERF_SAMPLE_ID or
 276 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
 277 * perf_record_sample.
 278 */
 279static int __perf_evsel__calc_id_pos(u64 sample_type)
 280{
 281	int idx = 0;
 282
 283	if (sample_type & PERF_SAMPLE_IDENTIFIER)
 284		return 0;
 285
 286	if (!(sample_type & PERF_SAMPLE_ID))
 287		return -1;
 288
 289	if (sample_type & PERF_SAMPLE_IP)
 290		idx += 1;
 291
 292	if (sample_type & PERF_SAMPLE_TID)
 293		idx += 1;
 294
 295	if (sample_type & PERF_SAMPLE_TIME)
 296		idx += 1;
 297
 298	if (sample_type & PERF_SAMPLE_ADDR)
 299		idx += 1;
 300
 301	return idx;
 302}
 303
 304/**
 305 * __perf_evsel__calc_is_pos - calculate is_pos.
 306 * @sample_type: sample type
 307 *
 308 * This function returns the position (counting backwards) of the event id
 309 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
 310 * sample_id_all is used there is an id sample appended to non-sample events.
 311 */
 312static int __perf_evsel__calc_is_pos(u64 sample_type)
 313{
 314	int idx = 1;
 315
 316	if (sample_type & PERF_SAMPLE_IDENTIFIER)
 317		return 1;
 318
 319	if (!(sample_type & PERF_SAMPLE_ID))
 320		return -1;
 321
 322	if (sample_type & PERF_SAMPLE_CPU)
 323		idx += 1;
 324
 325	if (sample_type & PERF_SAMPLE_STREAM_ID)
 326		idx += 1;
 327
 328	return idx;
 329}
 330
 331void evsel__calc_id_pos(struct evsel *evsel)
 332{
 333	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
 334	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
 335}
 336
 337void __evsel__set_sample_bit(struct evsel *evsel,
 338				  enum perf_event_sample_format bit)
 339{
 340	if (!(evsel->core.attr.sample_type & bit)) {
 341		evsel->core.attr.sample_type |= bit;
 342		evsel->sample_size += sizeof(u64);
 343		evsel__calc_id_pos(evsel);
 344	}
 345}
 346
 347void __evsel__reset_sample_bit(struct evsel *evsel,
 348				    enum perf_event_sample_format bit)
 349{
 350	if (evsel->core.attr.sample_type & bit) {
 351		evsel->core.attr.sample_type &= ~bit;
 352		evsel->sample_size -= sizeof(u64);
 353		evsel__calc_id_pos(evsel);
 354	}
 355}
 356
 357void evsel__set_sample_id(struct evsel *evsel,
 358			       bool can_sample_identifier)
 359{
 360	if (can_sample_identifier) {
 361		evsel__reset_sample_bit(evsel, ID);
 362		evsel__set_sample_bit(evsel, IDENTIFIER);
 363	} else {
 364		evsel__set_sample_bit(evsel, ID);
 365	}
 366	evsel->core.attr.read_format |= PERF_FORMAT_ID;
 367}
 368
 369/**
 370 * evsel__is_function_event - Return whether given evsel is a function
 371 * trace event
 372 *
 373 * @evsel - evsel selector to be tested
 374 *
 375 * Return %true if event is function trace event
 376 */
 377bool evsel__is_function_event(struct evsel *evsel)
 378{
 379#define FUNCTION_EVENT "ftrace:function"
 380
 381	return evsel->name &&
 382	       !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
 383
 384#undef FUNCTION_EVENT
 385}
 386
 387void evsel__init(struct evsel *evsel,
 388		 struct perf_event_attr *attr, int idx)
 389{
 390	perf_evsel__init(&evsel->core, attr, idx);
 391	evsel->tracking	   = !idx;
 392	evsel->unit	   = strdup("");
 393	evsel->scale	   = 1.0;
 394	evsel->max_events  = ULONG_MAX;
 395	evsel->evlist	   = NULL;
 396	evsel->bpf_obj	   = NULL;
 397	evsel->bpf_fd	   = -1;
 398	INIT_LIST_HEAD(&evsel->config_terms);
 399	INIT_LIST_HEAD(&evsel->bpf_counter_list);
 400	INIT_LIST_HEAD(&evsel->bpf_filters);
 401	perf_evsel__object.init(evsel);
 402	evsel->sample_size = __evsel__sample_size(attr->sample_type);
 403	evsel__calc_id_pos(evsel);
 404	evsel->cmdline_group_boundary = false;
 405	evsel->per_pkg_mask  = NULL;
 406	evsel->collect_stat  = false;
 407	evsel->group_pmu_name = NULL;
 408	evsel->skippable     = false;
 409	evsel->supported     = true;
 410	evsel->alternate_hw_config = PERF_COUNT_HW_MAX;
 411	evsel->script_output_type = -1; // FIXME: OUTPUT_TYPE_UNSET, see builtin-script.c
 412}
 413
 414struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
 415{
 416	struct evsel *evsel = zalloc(perf_evsel__object.size);
 417
 418	if (!evsel)
 419		return NULL;
 420	evsel__init(evsel, attr, idx);
 421
 422	if (evsel__is_bpf_output(evsel) && !attr->sample_type) {
 423		evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 424					    PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 425		evsel->core.attr.sample_period = 1;
 426	}
 427
 428	if (evsel__is_clock(evsel)) {
 429		free((char *)evsel->unit);
 430		evsel->unit = strdup("msec");
 431		evsel->scale = 1e-6;
 432	}
 433
 434	return evsel;
 435}
 436
 437int copy_config_terms(struct list_head *dst, struct list_head *src)
 438{
 439	struct evsel_config_term *pos, *tmp;
 440
 441	list_for_each_entry(pos, src, list) {
 442		tmp = malloc(sizeof(*tmp));
 443		if (tmp == NULL)
 444			return -ENOMEM;
 445
 446		*tmp = *pos;
 447		if (tmp->free_str) {
 448			tmp->val.str = strdup(pos->val.str);
 449			if (tmp->val.str == NULL) {
 450				free(tmp);
 451				return -ENOMEM;
 452			}
 453		}
 454		list_add_tail(&tmp->list, dst);
 455	}
 456	return 0;
 457}
 458
 459static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src)
 460{
 461	return copy_config_terms(&dst->config_terms, &src->config_terms);
 462}
 463
 464/**
 465 * evsel__clone - create a new evsel copied from @orig
 466 * @orig: original evsel
 467 *
 468 * The assumption is that @orig is not configured nor opened yet.
 469 * So we only care about the attributes that can be set while it's parsed.
 470 */
 471struct evsel *evsel__clone(struct evsel *dest, struct evsel *orig)
 472{
 473	struct evsel *evsel;
 474
 475	BUG_ON(orig->core.fd);
 476	BUG_ON(orig->counts);
 477	BUG_ON(orig->priv);
 478	BUG_ON(orig->per_pkg_mask);
 479
 480	/* cannot handle BPF objects for now */
 481	if (orig->bpf_obj)
 482		return NULL;
 483
 484	if (dest)
 485		evsel = dest;
 486	else
 487		evsel = evsel__new(&orig->core.attr);
 488
 489	if (evsel == NULL)
 490		return NULL;
 491
 492	evsel->core.cpus = perf_cpu_map__get(orig->core.cpus);
 493	evsel->core.pmu_cpus = perf_cpu_map__get(orig->core.pmu_cpus);
 494	evsel->core.threads = perf_thread_map__get(orig->core.threads);
 495	evsel->core.nr_members = orig->core.nr_members;
 496	evsel->core.system_wide = orig->core.system_wide;
 497	evsel->core.requires_cpu = orig->core.requires_cpu;
 498	evsel->core.is_pmu_core = orig->core.is_pmu_core;
 499
 500	if (orig->name) {
 501		evsel->name = strdup(orig->name);
 502		if (evsel->name == NULL)
 503			goto out_err;
 504	}
 505	if (orig->group_name) {
 506		evsel->group_name = strdup(orig->group_name);
 507		if (evsel->group_name == NULL)
 508			goto out_err;
 509	}
 510	if (orig->group_pmu_name) {
 511		evsel->group_pmu_name = strdup(orig->group_pmu_name);
 512		if (evsel->group_pmu_name == NULL)
 513			goto out_err;
 514	}
 515	if (orig->filter) {
 516		evsel->filter = strdup(orig->filter);
 517		if (evsel->filter == NULL)
 518			goto out_err;
 519	}
 520	if (orig->metric_id) {
 521		evsel->metric_id = strdup(orig->metric_id);
 522		if (evsel->metric_id == NULL)
 523			goto out_err;
 524	}
 525	evsel->cgrp = cgroup__get(orig->cgrp);
 526#ifdef HAVE_LIBTRACEEVENT
 527	if (orig->tp_sys) {
 528		evsel->tp_sys = strdup(orig->tp_sys);
 529		if (evsel->tp_sys == NULL)
 530			goto out_err;
 531	}
 532	if (orig->tp_name) {
 533		evsel->tp_name = strdup(orig->tp_name);
 534		if (evsel->tp_name == NULL)
 535			goto out_err;
 536	}
 537	evsel->tp_format = orig->tp_format;
 538#endif
 539	evsel->handler = orig->handler;
 540	evsel->core.leader = orig->core.leader;
 541	evsel->metric_leader = orig->metric_leader;
 542
 543	evsel->max_events = orig->max_events;
 544	zfree(&evsel->unit);
 545	if (orig->unit) {
 546		evsel->unit = strdup(orig->unit);
 547		if (evsel->unit == NULL)
 548			goto out_err;
 549	}
 550	evsel->scale = orig->scale;
 551	evsel->snapshot = orig->snapshot;
 552	evsel->per_pkg = orig->per_pkg;
 553	evsel->percore = orig->percore;
 554	evsel->precise_max = orig->precise_max;
 555	evsel->is_libpfm_event = orig->is_libpfm_event;
 556
 557	evsel->exclude_GH = orig->exclude_GH;
 558	evsel->sample_read = orig->sample_read;
 559	evsel->collect_stat = orig->collect_stat;
 560	evsel->weak_group = orig->weak_group;
 561	evsel->use_config_name = orig->use_config_name;
 562	evsel->pmu = orig->pmu;
 563	evsel->first_wildcard_match = orig->first_wildcard_match;
 564
 565	if (evsel__copy_config_terms(evsel, orig) < 0)
 566		goto out_err;
 567
 568	evsel->alternate_hw_config = orig->alternate_hw_config;
 569
 570	return evsel;
 571
 572out_err:
 573	evsel__delete(evsel);
 574	return NULL;
 575}
 576
 577/*
 578 * Returns pointer with encoded error via <linux/err.h> interface.
 579 */
 580struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx, bool format)
 581{
 582	struct perf_event_attr attr = {
 583		.type	       = PERF_TYPE_TRACEPOINT,
 584		.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 585				PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 586	};
 587	struct evsel *evsel = zalloc(perf_evsel__object.size);
 588	int err = -ENOMEM, id = -1;
 589
 590	if (evsel == NULL)
 591		goto out_err;
 592
 593
 594	if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
 595		goto out_free;
 596
 597#ifdef HAVE_LIBTRACEEVENT
 598	evsel->tp_sys = strdup(sys);
 599	if (!evsel->tp_sys)
 600		goto out_free;
 601
 602	evsel->tp_name = strdup(name);
 603	if (!evsel->tp_name)
 604		goto out_free;
 605#endif
 606
 607	event_attr_init(&attr);
 608
 609	if (format) {
 610		id = tp_pmu__id(sys, name);
 611		if (id < 0) {
 612			err = id;
 613			goto out_free;
 614		}
 615	}
 616	attr.config = (__u64)id;
 617	attr.sample_period = 1;
 618	evsel__init(evsel, &attr, idx);
 619	return evsel;
 620
 621out_free:
 622	zfree(&evsel->name);
 623#ifdef HAVE_LIBTRACEEVENT
 624	zfree(&evsel->tp_sys);
 625	zfree(&evsel->tp_name);
 626#endif
 627	free(evsel);
 628out_err:
 629	return ERR_PTR(err);
 630}
 631
 632#ifdef HAVE_LIBTRACEEVENT
 633struct tep_event *evsel__tp_format(struct evsel *evsel)
 634{
 635	struct tep_event *tp_format = evsel->tp_format;
 636
 637	if (tp_format)
 638		return tp_format;
 639
 640	if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
 641		return NULL;
 642
 643	if (!evsel->tp_sys)
 644		tp_format = trace_event__tp_format_id(evsel->core.attr.config);
 645	else
 646		tp_format = trace_event__tp_format(evsel->tp_sys, evsel->tp_name);
 647
 648	if (IS_ERR(tp_format)) {
 649		int err = -PTR_ERR(evsel->tp_format);
 650
 651		pr_err("Error getting tracepoint format '%s' '%s'(%d)\n",
 652			evsel__name(evsel), strerror(err), err);
 653		return NULL;
 654	}
 655	evsel->tp_format = tp_format;
 656	return evsel->tp_format;
 657}
 658#endif
 659
 660const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = {
 661	"cycles",
 662	"instructions",
 663	"cache-references",
 664	"cache-misses",
 665	"branches",
 666	"branch-misses",
 667	"bus-cycles",
 668	"stalled-cycles-frontend",
 669	"stalled-cycles-backend",
 670	"ref-cycles",
 671};
 672
 673char *evsel__bpf_counter_events;
 674
 675bool evsel__match_bpf_counter_events(const char *name)
 676{
 677	int name_len;
 678	bool match;
 679	char *ptr;
 680
 681	if (!evsel__bpf_counter_events)
 682		return false;
 683
 684	ptr = strstr(evsel__bpf_counter_events, name);
 685	name_len = strlen(name);
 686
 687	/* check name matches a full token in evsel__bpf_counter_events */
 688	match = (ptr != NULL) &&
 689		((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) &&
 690		((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0'));
 691
 692	return match;
 693}
 694
 695static const char *__evsel__hw_name(u64 config)
 696{
 697	if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config])
 698		return evsel__hw_names[config];
 699
 700	return "unknown-hardware";
 701}
 702
 703static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
 704{
 705	int colon = 0, r = 0;
 706	struct perf_event_attr *attr = &evsel->core.attr;
 707
 708#define MOD_PRINT(context, mod)	do {					\
 709		if (!attr->exclude_##context) {				\
 710			if (!colon) colon = ++r;			\
 711			r += scnprintf(bf + r, size - r, "%c", mod);	\
 712		} } while(0)
 713
 714	if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
 715		MOD_PRINT(kernel, 'k');
 716		MOD_PRINT(user, 'u');
 717		MOD_PRINT(hv, 'h');
 718	}
 719
 720	if (attr->precise_ip) {
 721		if (!colon)
 722			colon = ++r;
 723		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
 724	}
 725
 726	if (attr->exclude_host || attr->exclude_guest) {
 727		MOD_PRINT(host, 'H');
 728		MOD_PRINT(guest, 'G');
 729	}
 730#undef MOD_PRINT
 731	if (colon)
 732		bf[colon - 1] = ':';
 733	return r;
 734}
 735
 736int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
 737{
 738	return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
 739}
 740
 741static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
 742{
 743	int r = arch_evsel__hw_name(evsel, bf, size);
 744	return r + evsel__add_modifiers(evsel, bf + r, size - r);
 745}
 746
 747const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = {
 748	"cpu-clock",
 749	"task-clock",
 750	"page-faults",
 751	"context-switches",
 752	"cpu-migrations",
 753	"minor-faults",
 754	"major-faults",
 755	"alignment-faults",
 756	"emulation-faults",
 757	"dummy",
 758};
 759
 760static const char *__evsel__sw_name(u64 config)
 761{
 762	if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config])
 763		return evsel__sw_names[config];
 764	return "unknown-software";
 765}
 766
 767static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
 768{
 769	int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
 770	return r + evsel__add_modifiers(evsel, bf + r, size - r);
 771}
 772
 773static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
 774{
 775	int r;
 776
 777	r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
 778
 779	if (type & HW_BREAKPOINT_R)
 780		r += scnprintf(bf + r, size - r, "r");
 781
 782	if (type & HW_BREAKPOINT_W)
 783		r += scnprintf(bf + r, size - r, "w");
 784
 785	if (type & HW_BREAKPOINT_X)
 786		r += scnprintf(bf + r, size - r, "x");
 787
 788	return r;
 789}
 790
 791static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
 792{
 793	struct perf_event_attr *attr = &evsel->core.attr;
 794	int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
 795	return r + evsel__add_modifiers(evsel, bf + r, size - r);
 796}
 797
 798const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = {
 799 { "L1-dcache",	"l1-d",		"l1d",		"L1-data",		},
 800 { "L1-icache",	"l1-i",		"l1i",		"L1-instruction",	},
 801 { "LLC",	"L2",							},
 802 { "dTLB",	"d-tlb",	"Data-TLB",				},
 803 { "iTLB",	"i-tlb",	"Instruction-TLB",			},
 804 { "branch",	"branches",	"bpu",		"btb",		"bpc",	},
 805 { "node",								},
 806};
 807
 808const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = {
 809 { "load",	"loads",	"read",					},
 810 { "store",	"stores",	"write",				},
 811 { "prefetch",	"prefetches",	"speculative-read", "speculative-load",	},
 812};
 813
 814const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = {
 815 { "refs",	"Reference",	"ops",		"access",		},
 816 { "misses",	"miss",							},
 817};
 818
 819#define C(x)		PERF_COUNT_HW_CACHE_##x
 820#define CACHE_READ	(1 << C(OP_READ))
 821#define CACHE_WRITE	(1 << C(OP_WRITE))
 822#define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
 823#define COP(x)		(1 << x)
 824
 825/*
 826 * cache operation stat
 827 * L1I : Read and prefetch only
 828 * ITLB and BPU : Read-only
 829 */
 830static const unsigned long evsel__hw_cache_stat[C(MAX)] = {
 831 [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 832 [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
 833 [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 834 [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 835 [C(ITLB)]	= (CACHE_READ),
 836 [C(BPU)]	= (CACHE_READ),
 837 [C(NODE)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 838};
 839
 840bool evsel__is_cache_op_valid(u8 type, u8 op)
 841{
 842	if (evsel__hw_cache_stat[type] & COP(op))
 843		return true;	/* valid */
 844	else
 845		return false;	/* invalid */
 846}
 847
 848int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
 849{
 850	if (result) {
 851		return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0],
 852				 evsel__hw_cache_op[op][0],
 853				 evsel__hw_cache_result[result][0]);
 854	}
 855
 856	return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0],
 857			 evsel__hw_cache_op[op][1]);
 858}
 859
 860static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
 861{
 862	u8 op, result, type = (config >>  0) & 0xff;
 863	const char *err = "unknown-ext-hardware-cache-type";
 864
 865	if (type >= PERF_COUNT_HW_CACHE_MAX)
 866		goto out_err;
 867
 868	op = (config >>  8) & 0xff;
 869	err = "unknown-ext-hardware-cache-op";
 870	if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
 871		goto out_err;
 872
 873	result = (config >> 16) & 0xff;
 874	err = "unknown-ext-hardware-cache-result";
 875	if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
 876		goto out_err;
 877
 878	err = "invalid-cache";
 879	if (!evsel__is_cache_op_valid(type, op))
 880		goto out_err;
 881
 882	return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
 883out_err:
 884	return scnprintf(bf, size, "%s", err);
 885}
 886
 887static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
 888{
 889	int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
 890	return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
 891}
 892
 893static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
 894{
 895	int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
 896	return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
 897}
 898
 899const char *evsel__name(struct evsel *evsel)
 900{
 901	char bf[128];
 902
 903	if (!evsel)
 904		goto out_unknown;
 905
 906	if (evsel->name)
 907		return evsel->name;
 908
 909	switch (evsel->core.attr.type) {
 910	case PERF_TYPE_RAW:
 911		evsel__raw_name(evsel, bf, sizeof(bf));
 912		break;
 913
 914	case PERF_TYPE_HARDWARE:
 915		evsel__hw_name(evsel, bf, sizeof(bf));
 916		break;
 917
 918	case PERF_TYPE_HW_CACHE:
 919		evsel__hw_cache_name(evsel, bf, sizeof(bf));
 920		break;
 921
 922	case PERF_TYPE_SOFTWARE:
 923		evsel__sw_name(evsel, bf, sizeof(bf));
 924		break;
 925
 926	case PERF_TYPE_TRACEPOINT:
 927		scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
 928		break;
 929
 930	case PERF_TYPE_BREAKPOINT:
 931		evsel__bp_name(evsel, bf, sizeof(bf));
 932		break;
 933
 934	case PERF_PMU_TYPE_TOOL:
 935		scnprintf(bf, sizeof(bf), "%s", evsel__tool_pmu_event_name(evsel));
 936		break;
 937
 938	default:
 939		scnprintf(bf, sizeof(bf), "unknown attr type: %d",
 940			  evsel->core.attr.type);
 941		break;
 942	}
 943
 944	evsel->name = strdup(bf);
 945
 946	if (evsel->name)
 947		return evsel->name;
 948out_unknown:
 949	return "unknown";
 950}
 951
 952bool evsel__name_is(struct evsel *evsel, const char *name)
 953{
 954	return !strcmp(evsel__name(evsel), name);
 955}
 956
 957const char *evsel__metric_id(const struct evsel *evsel)
 958{
 959	if (evsel->metric_id)
 960		return evsel->metric_id;
 961
 962	if (evsel__is_tool(evsel))
 963		return evsel__tool_pmu_event_name(evsel);
 964
 965	return "unknown";
 966}
 967
 968const char *evsel__group_name(struct evsel *evsel)
 969{
 970	return evsel->group_name ?: "anon group";
 971}
 972
 973/*
 974 * Returns the group details for the specified leader,
 975 * with following rules.
 976 *
 977 *  For record -e '{cycles,instructions}'
 978 *    'anon group { cycles:u, instructions:u }'
 979 *
 980 *  For record -e 'cycles,instructions' and report --group
 981 *    'cycles:u, instructions:u'
 982 */
 983int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
 984{
 985	int ret = 0;
 986	bool first = true;
 987	struct evsel *pos;
 988	const char *group_name = evsel__group_name(evsel);
 989
 990	if (!evsel->forced_leader)
 991		ret = scnprintf(buf, size, "%s { ", group_name);
 992
 993	for_each_group_evsel(pos, evsel) {
 994		if (symbol_conf.skip_empty &&
 995		    evsel__hists(pos)->stats.nr_samples == 0)
 996			continue;
 997
 998		ret += scnprintf(buf + ret, size - ret, "%s%s",
 999				 first ? "" : ", ", evsel__name(pos));
1000		first = false;
1001	}
1002
1003	if (!evsel->forced_leader)
1004		ret += scnprintf(buf + ret, size - ret, " }");
1005
1006	return ret;
1007}
1008
1009static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
1010				      struct callchain_param *param)
1011{
1012	bool function = evsel__is_function_event(evsel);
1013	struct perf_event_attr *attr = &evsel->core.attr;
1014
1015	evsel__set_sample_bit(evsel, CALLCHAIN);
1016
1017	attr->sample_max_stack = param->max_stack;
1018
1019	if (opts->kernel_callchains)
1020		attr->exclude_callchain_user = 1;
1021	if (opts->user_callchains)
1022		attr->exclude_callchain_kernel = 1;
1023	if (param->record_mode == CALLCHAIN_LBR) {
1024		if (!opts->branch_stack) {
1025			if (attr->exclude_user) {
1026				pr_warning("LBR callstack option is only available "
1027					   "to get user callchain information. "
1028					   "Falling back to framepointers.\n");
1029			} else {
1030				evsel__set_sample_bit(evsel, BRANCH_STACK);
1031				attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
1032							PERF_SAMPLE_BRANCH_CALL_STACK |
1033							PERF_SAMPLE_BRANCH_NO_CYCLES |
1034							PERF_SAMPLE_BRANCH_NO_FLAGS |
1035							PERF_SAMPLE_BRANCH_HW_INDEX;
1036			}
1037		} else
1038			 pr_warning("Cannot use LBR callstack with branch stack. "
1039				    "Falling back to framepointers.\n");
1040	}
1041
1042	if (param->record_mode == CALLCHAIN_DWARF) {
1043		if (!function) {
1044			const char *arch = perf_env__arch(evsel__env(evsel));
1045
1046			evsel__set_sample_bit(evsel, REGS_USER);
1047			evsel__set_sample_bit(evsel, STACK_USER);
1048			if (opts->sample_user_regs &&
1049			    DWARF_MINIMAL_REGS(arch) != arch__user_reg_mask()) {
1050				attr->sample_regs_user |= DWARF_MINIMAL_REGS(arch);
1051				pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
1052					   "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
1053					   "so the minimal registers set (IP, SP) is explicitly forced.\n");
1054			} else {
1055				attr->sample_regs_user |= arch__user_reg_mask();
1056			}
1057			attr->sample_stack_user = param->dump_size;
1058			attr->exclude_callchain_user = 1;
1059		} else {
1060			pr_info("Cannot use DWARF unwind for function trace event,"
1061				" falling back to framepointers.\n");
1062		}
1063	}
1064
1065	if (function) {
1066		pr_info("Disabling user space callchains for function trace event.\n");
1067		attr->exclude_callchain_user = 1;
1068	}
1069
1070	if (param->defer && !attr->exclude_callchain_user)
1071		attr->defer_callchain = 1;
1072}
1073
1074void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
1075			     struct callchain_param *param)
1076{
1077	if (param->enabled)
1078		return __evsel__config_callchain(evsel, opts, param);
1079}
1080
1081static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param)
1082{
1083	struct perf_event_attr *attr = &evsel->core.attr;
1084
1085	evsel__reset_sample_bit(evsel, CALLCHAIN);
1086	if (param->record_mode == CALLCHAIN_LBR) {
1087		evsel__reset_sample_bit(evsel, BRANCH_STACK);
1088		attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
1089					      PERF_SAMPLE_BRANCH_CALL_STACK |
1090					      PERF_SAMPLE_BRANCH_HW_INDEX);
1091	}
1092	if (param->record_mode == CALLCHAIN_DWARF) {
1093		evsel__reset_sample_bit(evsel, REGS_USER);
1094		evsel__reset_sample_bit(evsel, STACK_USER);
1095	}
1096}
1097
1098static void evsel__apply_ratio_to_prev(struct evsel *evsel,
1099				       struct perf_event_attr *attr,
1100				       struct record_opts *opts,
1101				       const char *buf)
1102{
1103	struct perf_event_attr *prev_attr = NULL;
1104	struct evsel *evsel_prev = NULL;
1105	u64 type = evsel->core.attr.sample_type;
1106	u64 prev_type = 0;
1107	double rtp;
1108
1109	rtp = strtod(buf, NULL);
1110	if (rtp <= 0) {
1111		pr_err("Invalid ratio-to-prev value %lf\n", rtp);
1112		return;
1113	}
1114	if (evsel == evsel__leader(evsel)) {
1115		pr_err("Invalid use of ratio-to-prev term without preceding element in group\n");
1116		return;
1117	}
1118	if (!evsel->pmu->is_core) {
1119		pr_err("Event using ratio-to-prev term must have a core PMU\n");
1120		return;
1121	}
1122
1123	evsel_prev = evsel__prev(evsel);
1124	if (!evsel_prev) {
1125		pr_err("Previous event does not exist.\n");
1126		return;
1127	}
1128
1129	if (evsel_prev->pmu->type != evsel->pmu->type) {
1130		pr_err("Compared events (\"%s\", \"%s\") must have same PMU\n",
1131			evsel->name, evsel_prev->name);
1132		return;
1133	}
1134
1135	prev_attr = &evsel_prev->core.attr;
1136	prev_type = evsel_prev->core.attr.sample_type;
1137
1138	if (!(prev_type & PERF_SAMPLE_PERIOD)) {
1139		attr->sample_period = prev_attr->sample_period * rtp;
1140		attr->freq = 0;
1141		evsel__reset_sample_bit(evsel, PERIOD);
1142	} else if (!(type & PERF_SAMPLE_PERIOD)) {
1143		prev_attr->sample_period = attr->sample_period / rtp;
1144		prev_attr->freq = 0;
1145		evsel__reset_sample_bit(evsel_prev, PERIOD);
1146	} else {
1147		if (opts->user_interval != ULLONG_MAX) {
1148			prev_attr->sample_period = opts->user_interval;
1149			attr->sample_period = prev_attr->sample_period * rtp;
1150			prev_attr->freq = 0;
1151			attr->freq = 0;
1152			evsel__reset_sample_bit(evsel_prev, PERIOD);
1153			evsel__reset_sample_bit(evsel, PERIOD);
1154		} else {
1155			pr_err("Event period term or count (-c) must be set when using ratio-to-prev term.\n");
1156			return;
1157		}
1158	}
1159
1160	arch_evsel__apply_ratio_to_prev(evsel, attr);
1161}
1162
1163static void evsel__apply_config_terms(struct evsel *evsel,
1164				      struct record_opts *opts, bool track)
1165{
1166	struct evsel_config_term *term;
1167	struct list_head *config_terms = &evsel->config_terms;
1168	struct perf_event_attr *attr = &evsel->core.attr;
1169	/* callgraph default */
1170	struct callchain_param param = {
1171		.record_mode = callchain_param.record_mode,
1172	};
1173	u32 dump_size = 0;
1174	int max_stack = 0;
1175	const char *callgraph_buf = NULL;
1176	const char *rtp_buf = NULL;
1177
1178	list_for_each_entry(term, config_terms, list) {
1179		switch (term->type) {
1180		case EVSEL__CONFIG_TERM_PERIOD:
1181			if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
1182				attr->sample_period = term->val.period;
1183				attr->freq = 0;
1184				evsel__reset_sample_bit(evsel, PERIOD);
1185			}
1186			break;
1187		case EVSEL__CONFIG_TERM_FREQ:
1188			if (!(term->weak && opts->user_freq != UINT_MAX)) {
1189				attr->sample_freq = term->val.freq;
1190				attr->freq = 1;
1191				evsel__set_sample_bit(evsel, PERIOD);
1192			}
1193			break;
1194		case EVSEL__CONFIG_TERM_TIME:
1195			if (term->val.time)
1196				evsel__set_sample_bit(evsel, TIME);
1197			else
1198				evsel__reset_sample_bit(evsel, TIME);
1199			break;
1200		case EVSEL__CONFIG_TERM_CALLGRAPH:
1201			callgraph_buf = term->val.str;
1202			break;
1203		case EVSEL__CONFIG_TERM_BRANCH:
1204			if (term->val.str && strcmp(term->val.str, "no")) {
1205				evsel__set_sample_bit(evsel, BRANCH_STACK);
1206				parse_branch_str(term->val.str,
1207						 &attr->branch_sample_type);
1208			} else
1209				evsel__reset_sample_bit(evsel, BRANCH_STACK);
1210			break;
1211		case EVSEL__CONFIG_TERM_STACK_USER:
1212			dump_size = term->val.stack_user;
1213			break;
1214		case EVSEL__CONFIG_TERM_MAX_STACK:
1215			max_stack = term->val.max_stack;
1216			break;
1217		case EVSEL__CONFIG_TERM_MAX_EVENTS:
1218			evsel->max_events = term->val.max_events;
1219			break;
1220		case EVSEL__CONFIG_TERM_INHERIT:
1221			/*
1222			 * attr->inherit should has already been set by
1223			 * evsel__config. If user explicitly set
1224			 * inherit using config terms, override global
1225			 * opt->no_inherit setting.
1226			 */
1227			attr->inherit = term->val.inherit ? 1 : 0;
1228			break;
1229		case EVSEL__CONFIG_TERM_OVERWRITE:
1230			attr->write_backward = term->val.overwrite ? 1 : 0;
1231			break;
1232		case EVSEL__CONFIG_TERM_DRV_CFG:
1233			break;
1234		case EVSEL__CONFIG_TERM_PERCORE:
1235			break;
1236		case EVSEL__CONFIG_TERM_AUX_OUTPUT:
1237			attr->aux_output = term->val.aux_output ? 1 : 0;
1238			break;
1239		case EVSEL__CONFIG_TERM_AUX_ACTION:
1240			/* Already applied by auxtrace */
1241			break;
1242		case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
1243			/* Already applied by auxtrace */
1244			break;
1245		case EVSEL__CONFIG_TERM_CFG_CHG:
1246			break;
1247		case EVSEL__CONFIG_TERM_RATIO_TO_PREV:
1248			rtp_buf = term->val.str;
1249			break;
1250		default:
1251			break;
1252		}
1253	}
1254
1255	/* User explicitly set per-event callgraph, clear the old setting and reset. */
1256	if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
1257		bool sample_address = false;
1258
1259		if (max_stack) {
1260			param.max_stack = max_stack;
1261			if (callgraph_buf == NULL)
1262				callgraph_buf = "fp";
1263		}
1264
1265		/* parse callgraph parameters */
1266		if (callgraph_buf != NULL) {
1267			if (!strcmp(callgraph_buf, "no")) {
1268				param.enabled = false;
1269				param.record_mode = CALLCHAIN_NONE;
1270			} else {
1271				param.enabled = true;
1272				if (parse_callchain_record(callgraph_buf, &param)) {
1273					pr_err("per-event callgraph setting for %s failed. "
1274					       "Apply callgraph global setting for it\n",
1275					       evsel->name);
1276					return;
1277				}
1278				if (param.record_mode == CALLCHAIN_DWARF)
1279					sample_address = true;
1280			}
1281		}
1282		if (dump_size > 0) {
1283			dump_size = round_up(dump_size, sizeof(u64));
1284			param.dump_size = dump_size;
1285		}
1286
1287		/* If global callgraph set, clear it */
1288		if (callchain_param.enabled)
1289			evsel__reset_callgraph(evsel, &callchain_param);
1290
1291		/* set perf-event callgraph */
1292		if (param.enabled) {
1293			if (sample_address) {
1294				evsel__set_sample_bit(evsel, ADDR);
1295				evsel__set_sample_bit(evsel, DATA_SRC);
1296				evsel->core.attr.mmap_data = track;
1297			}
1298			evsel__config_callchain(evsel, opts, &param);
1299		}
1300	}
1301	if (rtp_buf)
1302		evsel__apply_ratio_to_prev(evsel, attr, opts, rtp_buf);
1303}
1304
1305struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type)
1306{
1307	struct evsel_config_term *term, *found_term = NULL;
1308
1309	list_for_each_entry(term, &evsel->config_terms, list) {
1310		if (term->type == type)
1311			found_term = term;
1312	}
1313
1314	return found_term;
1315}
1316
1317void __weak arch_evsel__set_sample_weight(struct evsel *evsel)
1318{
1319	evsel__set_sample_bit(evsel, WEIGHT);
1320}
1321
1322void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused,
1323				    struct perf_event_attr *attr __maybe_unused)
1324{
1325}
1326
1327void __weak arch_evsel__apply_ratio_to_prev(struct evsel *evsel __maybe_unused,
1328					    struct perf_event_attr *attr __maybe_unused)
1329{
1330}
1331
1332static void evsel__set_default_freq_period(struct record_opts *opts,
1333					   struct perf_event_attr *attr)
1334{
1335	if (opts->freq) {
1336		attr->freq = 1;
1337		attr->sample_freq = opts->freq;
1338	} else {
1339		attr->sample_period = opts->default_interval;
1340	}
1341}
1342
1343bool evsel__is_offcpu_event(struct evsel *evsel)
1344{
1345	return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT) &&
1346	       evsel->core.attr.sample_type & PERF_SAMPLE_RAW;
1347}
1348
1349/*
1350 * The enable_on_exec/disabled value strategy:
1351 *
1352 *  1) For any type of traced program:
1353 *    - all independent events and group leaders are disabled
1354 *    - all group members are enabled
1355 *
1356 *     Group members are ruled by group leaders. They need to
1357 *     be enabled, because the group scheduling relies on that.
1358 *
1359 *  2) For traced programs executed by perf:
1360 *     - all independent events and group leaders have
1361 *       enable_on_exec set
1362 *     - we don't specifically enable or disable any event during
1363 *       the record command
1364 *
1365 *     Independent events and group leaders are initially disabled
1366 *     and get enabled by exec. Group members are ruled by group
1367 *     leaders as stated in 1).
1368 *
1369 *  3) For traced programs attached by perf (pid/tid):
1370 *     - we specifically enable or disable all events during
1371 *       the record command
1372 *
1373 *     When attaching events to already running traced we
1374 *     enable/disable events specifically, as there's no
1375 *     initial traced exec call.
1376 */
1377void evsel__config(struct evsel *evsel, struct record_opts *opts,
1378		   struct callchain_param *callchain)
1379{
1380	struct evsel *leader = evsel__leader(evsel);
1381	struct perf_event_attr *attr = &evsel->core.attr;
1382	int track = evsel->tracking;
1383	bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
1384
1385	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
1386	attr->inherit	    = target__has_cpu(&opts->target) ? 0 : !opts->no_inherit;
1387	attr->write_backward = opts->overwrite ? 1 : 0;
1388	attr->read_format   = PERF_FORMAT_LOST;
1389
1390	evsel__set_sample_bit(evsel, IP);
1391	evsel__set_sample_bit(evsel, TID);
1392
1393	if (evsel->sample_read) {
1394		evsel__set_sample_bit(evsel, READ);
1395
1396		/*
1397		 * We need ID even in case of single event, because
1398		 * PERF_SAMPLE_READ process ID specific data.
1399		 */
1400		evsel__set_sample_id(evsel, false);
1401
1402		/*
1403		 * Apply group format only if we belong to group
1404		 * with more than one members.
1405		 */
1406		if (leader->core.nr_members > 1) {
1407			attr->read_format |= PERF_FORMAT_GROUP;
1408		}
1409
1410		/*
1411		 * Inherit + SAMPLE_READ requires SAMPLE_TID in the read_format
1412		 */
1413		if (attr->inherit) {
1414			evsel__set_sample_bit(evsel, TID);
1415			evsel->core.attr.read_format |=
1416				PERF_FORMAT_ID;
1417		}
1418	}
1419
1420	/*
1421	 * We default some events to have a default interval. But keep
1422	 * it a weak assumption overridable by the user.
1423	 */
1424	if ((evsel->is_libpfm_event && !attr->sample_period) ||
1425	    (!evsel->is_libpfm_event && (!attr->sample_period ||
1426					 opts->user_freq != UINT_MAX ||
1427					 opts->user_interval != ULLONG_MAX)))
1428		evsel__set_default_freq_period(opts, attr);
1429
1430	/*
1431	 * If attr->freq was set (here or earlier), ask for period
1432	 * to be sampled.
1433	 */
1434	if (attr->freq)
1435		evsel__set_sample_bit(evsel, PERIOD);
1436
1437	if (opts->no_samples)
1438		attr->sample_freq = 0;
1439
1440	if (opts->inherit_stat) {
1441		evsel->core.attr.read_format |=
1442			PERF_FORMAT_TOTAL_TIME_ENABLED |
1443			PERF_FORMAT_TOTAL_TIME_RUNNING |
1444			PERF_FORMAT_ID;
1445		attr->inherit_stat = 1;
1446	}
1447
1448	if (opts->sample_address) {
1449		evsel__set_sample_bit(evsel, ADDR);
1450		attr->mmap_data = track;
1451	}
1452
1453	/*
1454	 * We don't allow user space callchains for  function trace
1455	 * event, due to issues with page faults while tracing page
1456	 * fault handler and its overall trickiness nature.
1457	 */
1458	if (evsel__is_function_event(evsel))
1459		evsel->core.attr.exclude_callchain_user = 1;
1460
1461	if (callchain && callchain->enabled && !evsel->no_aux_samples)
1462		evsel__config_callchain(evsel, opts, callchain);
1463
1464	if (opts->sample_intr_regs && !evsel->no_aux_samples &&
1465	    !evsel__is_dummy_event(evsel)) {
1466		attr->sample_regs_intr = opts->sample_intr_regs;
1467		evsel__set_sample_bit(evsel, REGS_INTR);
1468	}
1469
1470	if (opts->sample_user_regs && !evsel->no_aux_samples &&
1471	    !evsel__is_dummy_event(evsel)) {
1472		attr->sample_regs_user |= opts->sample_user_regs;
1473		evsel__set_sample_bit(evsel, REGS_USER);
1474	}
1475
1476	if (target__has_cpu(&opts->target) || opts->sample_cpu)
1477		evsel__set_sample_bit(evsel, CPU);
1478
1479	/*
1480	 * When the user explicitly disabled time don't force it here.
1481	 */
1482	if (opts->sample_time &&
1483	    (!perf_missing_features.sample_id_all &&
1484	    (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1485	     opts->sample_time_set)))
1486		evsel__set_sample_bit(evsel, TIME);
1487
1488	if (opts->raw_samples && !evsel->no_aux_samples) {
1489		evsel__set_sample_bit(evsel, TIME);
1490		evsel__set_sample_bit(evsel, RAW);
1491		evsel__set_sample_bit(evsel, CPU);
1492	}
1493
1494	if (opts->sample_data_src)
1495		evsel__set_sample_bit(evsel, DATA_SRC);
1496
1497	if (opts->sample_phys_addr)
1498		evsel__set_sample_bit(evsel, PHYS_ADDR);
1499
1500	if (opts->no_buffering) {
1501		attr->watermark = 0;
1502		attr->wakeup_events = 1;
1503	}
1504	if (opts->branch_stack && !evsel->no_aux_samples) {
1505		evsel__set_sample_bit(evsel, BRANCH_STACK);
1506		attr->branch_sample_type = opts->branch_stack;
1507	}
1508
1509	if (opts->sample_weight || evsel->retire_lat) {
1510		arch_evsel__set_sample_weight(evsel);
1511		evsel->retire_lat = false;
1512	}
1513	attr->task     = track;
1514	attr->mmap     = track;
1515	attr->mmap2    = track && !perf_missing_features.mmap2;
1516	attr->comm     = track;
1517	attr->build_id = track && opts->build_id;
1518	attr->defer_output = track && callchain && callchain->defer;
1519
1520	/*
1521	 * ksymbol is tracked separately with text poke because it needs to be
1522	 * system wide and enabled immediately.
1523	 */
1524	if (!opts->text_poke)
1525		attr->ksymbol = track && !perf_missing_features.ksymbol;
1526	attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1527
1528	if (opts->record_namespaces)
1529		attr->namespaces  = track;
1530
1531	if (opts->record_cgroup) {
1532		attr->cgroup = track && !perf_missing_features.cgroup;
1533		evsel__set_sample_bit(evsel, CGROUP);
1534	}
1535
1536	if (opts->sample_data_page_size)
1537		evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
1538
1539	if (opts->sample_code_page_size)
1540		evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
1541
1542	if (opts->record_switch_events)
1543		attr->context_switch = track;
1544
1545	if (opts->sample_transaction)
1546		evsel__set_sample_bit(evsel, TRANSACTION);
1547
1548	if (opts->running_time) {
1549		evsel->core.attr.read_format |=
1550			PERF_FORMAT_TOTAL_TIME_ENABLED |
1551			PERF_FORMAT_TOTAL_TIME_RUNNING;
1552	}
1553
1554	/*
1555	 * XXX see the function comment above
1556	 *
1557	 * Disabling only independent events or group leaders,
1558	 * keeping group members enabled.
1559	 */
1560	if (evsel__is_group_leader(evsel))
1561		attr->disabled = 1;
1562
1563	/*
1564	 * Setting enable_on_exec for independent events and
1565	 * group leaders for traced executed by perf.
1566	 */
1567	if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
1568	    !opts->target.initial_delay)
1569		attr->enable_on_exec = 1;
1570
1571	if (evsel->immediate) {
1572		attr->disabled = 0;
1573		attr->enable_on_exec = 0;
1574	}
1575
1576	clockid = opts->clockid;
1577	if (opts->use_clockid) {
1578		attr->use_clockid = 1;
1579		attr->clockid = opts->clockid;
1580	}
1581
1582	if (evsel->precise_max)
1583		attr->precise_ip = 3;
1584
1585	if (opts->all_user) {
1586		attr->exclude_kernel = 1;
1587		attr->exclude_user   = 0;
1588	}
1589
1590	if (opts->all_kernel) {
1591		attr->exclude_kernel = 0;
1592		attr->exclude_user   = 1;
1593	}
1594
1595	if (evsel->core.pmu_cpus || evsel->unit)
1596		evsel->core.attr.read_format |= PERF_FORMAT_ID;
1597
1598	/*
1599	 * Apply event specific term settings,
1600	 * it overloads any global configuration.
1601	 */
1602	evsel__apply_config_terms(evsel, opts, track);
1603
1604	evsel->ignore_missing_thread = opts->ignore_missing_thread;
1605
1606	/* The --period option takes the precedence. */
1607	if (opts->period_set) {
1608		if (opts->period)
1609			evsel__set_sample_bit(evsel, PERIOD);
1610		else
1611			evsel__reset_sample_bit(evsel, PERIOD);
1612	}
1613
1614	/*
1615	 * A dummy event never triggers any actual counter and therefore
1616	 * cannot be used with branch_stack.
1617	 *
1618	 * For initial_delay, a dummy event is added implicitly.
1619	 * The software event will trigger -EOPNOTSUPP error out,
1620	 * if BRANCH_STACK bit is set.
1621	 */
1622	if (evsel__is_dummy_event(evsel))
1623		evsel__reset_sample_bit(evsel, BRANCH_STACK);
1624
1625	if (evsel__is_offcpu_event(evsel)) {
1626		evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES;
1627		attr->inherit = 0;
1628	}
1629
1630	arch__post_evsel_config(evsel, attr);
1631}
1632
1633int evsel__set_filter(struct evsel *evsel, const char *filter)
1634{
1635	char *new_filter = strdup(filter);
1636
1637	if (new_filter != NULL) {
1638		free(evsel->filter);
1639		evsel->filter = new_filter;
1640		return 0;
1641	}
1642
1643	return -1;
1644}
1645
1646static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
1647{
1648	char *new_filter;
1649
1650	if (evsel->filter == NULL)
1651		return evsel__set_filter(evsel, filter);
1652
1653	if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1654		free(evsel->filter);
1655		evsel->filter = new_filter;
1656		return 0;
1657	}
1658
1659	return -1;
1660}
1661
1662int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1663{
1664	return evsel__append_filter(evsel, "(%s) && (%s)", filter);
1665}
1666
1667int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1668{
1669	return evsel__append_filter(evsel, "%s,%s", filter);
1670}
1671
1672/* Caller has to clear disabled after going through all CPUs. */
1673int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx)
1674{
1675	return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
1676}
1677
1678int evsel__enable(struct evsel *evsel)
1679{
1680	int err = perf_evsel__enable(&evsel->core);
1681
1682	if (!err)
1683		evsel->disabled = false;
1684	return err;
1685}
1686
1687/* Caller has to set disabled after going through all CPUs. */
1688int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx)
1689{
1690	return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx);
1691}
1692
1693int evsel__disable(struct evsel *evsel)
1694{
1695	int err = perf_evsel__disable(&evsel->core);
1696	/*
1697	 * We mark it disabled here so that tools that disable a event can
1698	 * ignore events after they disable it. I.e. the ring buffer may have
1699	 * already a few more events queued up before the kernel got the stop
1700	 * request.
1701	 */
1702	if (!err)
1703		evsel->disabled = true;
1704
1705	return err;
1706}
1707
1708void free_config_terms(struct list_head *config_terms)
1709{
1710	struct evsel_config_term *term, *h;
1711
1712	list_for_each_entry_safe(term, h, config_terms, list) {
1713		list_del_init(&term->list);
1714		if (term->free_str)
1715			zfree(&term->val.str);
1716		free(term);
1717	}
1718}
1719
1720static void evsel__free_config_terms(struct evsel *evsel)
1721{
1722	free_config_terms(&evsel->config_terms);
1723}
1724
1725static void (*evsel__priv_destructor)(void *priv);
1726
1727void evsel__set_priv_destructor(void (*destructor)(void *priv))
1728{
1729	assert(evsel__priv_destructor == NULL);
1730
1731	evsel__priv_destructor = destructor;
1732}
1733
1734void evsel__exit(struct evsel *evsel)
1735{
1736	assert(list_empty(&evsel->core.node));
1737	assert(evsel->evlist == NULL);
1738	if (evsel__is_retire_lat(evsel))
1739		evsel__tpebs_close(evsel);
1740	bpf_counter__destroy(evsel);
1741	perf_bpf_filter__destroy(evsel);
1742	evsel__free_counts(evsel);
1743	perf_evsel__free_fd(&evsel->core);
1744	perf_evsel__free_id(&evsel->core);
1745	evsel__free_config_terms(evsel);
1746	cgroup__put(evsel->cgrp);
1747	perf_evsel__exit(&evsel->core);
1748	zfree(&evsel->group_name);
1749	zfree(&evsel->name);
1750#ifdef HAVE_LIBTRACEEVENT
1751	zfree(&evsel->tp_sys);
1752	zfree(&evsel->tp_name);
1753#endif
1754	zfree(&evsel->filter);
1755	zfree(&evsel->group_pmu_name);
1756	zfree(&evsel->unit);
1757	zfree(&evsel->metric_id);
1758	evsel__zero_per_pkg(evsel);
1759	hashmap__free(evsel->per_pkg_mask);
1760	evsel->per_pkg_mask = NULL;
1761	if (evsel__priv_destructor)
1762		evsel__priv_destructor(evsel->priv);
1763	perf_evsel__object.fini(evsel);
1764	if (evsel__tool_event(evsel) == TOOL_PMU__EVENT_SYSTEM_TIME ||
1765	    evsel__tool_event(evsel) == TOOL_PMU__EVENT_USER_TIME)
1766		xyarray__delete(evsel->start_times);
1767}
1768
1769void evsel__delete(struct evsel *evsel)
1770{
1771	if (!evsel)
1772		return;
1773
1774	evsel__exit(evsel);
1775	free(evsel);
1776}
1777
1778void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread,
1779			   struct perf_counts_values *count)
1780{
1781	struct perf_counts_values tmp;
1782
1783	if (!evsel->prev_raw_counts)
1784		return;
1785
1786	tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread);
1787	*perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count;
1788
1789	count->val = count->val - tmp.val;
1790	count->ena = count->ena - tmp.ena;
1791	count->run = count->run - tmp.run;
1792}
1793
1794static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread)
1795{
1796	struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread);
1797
1798	return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count);
1799}
1800
1801static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
1802			     u64 val, u64 ena, u64 run, u64 lost)
1803{
1804	struct perf_counts_values *count;
1805
1806	count = perf_counts(counter->counts, cpu_map_idx, thread);
1807
1808	if (evsel__is_retire_lat(counter)) {
1809		evsel__tpebs_read(counter, cpu_map_idx, thread);
1810		perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
1811		return;
1812	}
1813
1814	count->val    = val;
1815	count->ena    = ena;
1816	count->run    = run;
1817	count->lost   = lost;
1818
1819	perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
1820}
1821
1822static bool evsel__group_has_tpebs(struct evsel *leader)
1823{
1824	struct evsel *evsel;
1825
1826	for_each_group_evsel(evsel, leader) {
1827		if (evsel__is_retire_lat(evsel))
1828			return true;
1829	}
1830	return false;
1831}
1832
1833static u64 evsel__group_read_nr_members(struct evsel *leader)
1834{
1835	u64 nr = leader->core.nr_members;
1836	struct evsel *evsel;
1837
1838	for_each_group_evsel(evsel, leader) {
1839		if (evsel__is_retire_lat(evsel))
1840			nr--;
1841	}
1842	return nr;
1843}
1844
1845static u64 evsel__group_read_size(struct evsel *leader)
1846{
1847	u64 read_format = leader->core.attr.read_format;
1848	int entry = sizeof(u64); /* value */
1849	int size = 0;
1850	int nr = 1;
1851
1852	if (!evsel__group_has_tpebs(leader))
1853		return perf_evsel__read_size(&leader->core);
1854
1855	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1856		size += sizeof(u64);
1857
1858	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1859		size += sizeof(u64);
1860
1861	if (read_format & PERF_FORMAT_ID)
1862		entry += sizeof(u64);
1863
1864	if (read_format & PERF_FORMAT_LOST)
1865		entry += sizeof(u64);
1866
1867	if (read_format & PERF_FORMAT_GROUP) {
1868		nr = evsel__group_read_nr_members(leader);
1869		size += sizeof(u64);
1870	}
1871
1872	size += entry * nr;
1873	return size;
1874}
1875
1876static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data)
1877{
1878	u64 read_format = leader->core.attr.read_format;
1879	struct sample_read_value *v;
1880	u64 nr, ena = 0, run = 0, lost = 0;
1881
1882	nr = *data++;
1883
1884	if (nr != evsel__group_read_nr_members(leader))
1885		return -EINVAL;
1886
1887	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1888		ena = *data++;
1889
1890	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1891		run = *data++;
1892
1893	v = (void *)data;
1894	sample_read_group__for_each(v, nr, read_format) {
1895		struct evsel *counter;
1896
1897		counter = evlist__id2evsel(leader->evlist, v->id);
1898		if (!counter)
1899			return -EINVAL;
1900
1901		if (read_format & PERF_FORMAT_LOST)
1902			lost = v->lost;
1903
1904		evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost);
1905	}
1906
1907	return 0;
1908}
1909
1910static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread)
1911{
1912	struct perf_stat_evsel *ps = leader->stats;
1913	u64 read_format = leader->core.attr.read_format;
1914	int size = evsel__group_read_size(leader);
1915	u64 *data = ps->group_data;
1916
1917	if (!(read_format & PERF_FORMAT_ID))
1918		return -EINVAL;
1919
1920	if (!evsel__is_group_leader(leader))
1921		return -EINVAL;
1922
1923	if (!data) {
1924		data = zalloc(size);
1925		if (!data)
1926			return -ENOMEM;
1927
1928		ps->group_data = data;
1929	}
1930
1931	if (FD(leader, cpu_map_idx, thread) < 0)
1932		return -EINVAL;
1933
1934	if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0)
1935		return -errno;
1936
1937	return evsel__process_group_data(leader, cpu_map_idx, thread, data);
1938}
1939
1940bool __evsel__match(const struct evsel *evsel, u32 type, u64 config)
1941{
1942
1943	u32 e_type = evsel->core.attr.type;
1944	u64 e_config = evsel->core.attr.config;
1945
1946	if (e_type == type && e_config == config)
1947		return true;
1948	if (type != PERF_TYPE_HARDWARE && type != PERF_TYPE_HW_CACHE)
1949		return false;
1950	if ((e_type == PERF_TYPE_HARDWARE || e_type == PERF_TYPE_HW_CACHE) &&
1951		perf_pmus__supports_extended_type())
1952		e_config &= PERF_HW_EVENT_MASK;
1953	if (e_type == type && e_config == config)
1954		return true;
1955	if (type == PERF_TYPE_HARDWARE && evsel->pmu && evsel->pmu->is_core &&
1956	    evsel->alternate_hw_config == config)
1957		return true;
1958	return false;
1959}
1960
1961int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread)
1962{
1963	if (evsel__is_tool(evsel))
1964		return evsel__tool_pmu_read(evsel, cpu_map_idx, thread);
1965
1966	if (evsel__is_hwmon(evsel))
1967		return evsel__hwmon_pmu_read(evsel, cpu_map_idx, thread);
1968
1969	if (evsel__is_drm(evsel))
1970		return evsel__drm_pmu_read(evsel, cpu_map_idx, thread);
1971
1972	if (evsel__is_retire_lat(evsel))
1973		return evsel__tpebs_read(evsel, cpu_map_idx, thread);
1974
1975	if (evsel->core.attr.read_format & PERF_FORMAT_GROUP)
1976		return evsel__read_group(evsel, cpu_map_idx, thread);
1977
1978	return evsel__read_one(evsel, cpu_map_idx, thread);
1979}
1980
1981int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale)
1982{
1983	struct perf_counts_values count;
1984	size_t nv = scale ? 3 : 1;
1985
1986	if (FD(evsel, cpu_map_idx, thread) < 0)
1987		return -EINVAL;
1988
1989	if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0)
1990		return -ENOMEM;
1991
1992	if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0)
1993		return -errno;
1994
1995	evsel__compute_deltas(evsel, cpu_map_idx, thread, &count);
1996	perf_counts_values__scale(&count, scale, NULL);
1997	*perf_counts(evsel->counts, cpu_map_idx, thread) = count;
1998	return 0;
1999}
2000
2001static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other,
2002				  int cpu_map_idx)
2003{
2004	struct perf_cpu cpu;
2005
2006	cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx);
2007	return perf_cpu_map__idx(other->core.cpus, cpu);
2008}
2009
2010static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx)
2011{
2012	struct evsel *leader = evsel__leader(evsel);
2013
2014	if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) ||
2015	    (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) {
2016		return evsel__match_other_cpu(evsel, leader, cpu_map_idx);
2017	}
2018
2019	return cpu_map_idx;
2020}
2021
2022static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread)
2023{
2024	struct evsel *leader = evsel__leader(evsel);
2025	int fd;
2026
2027	if (!evsel->supported || evsel__is_group_leader(evsel))
2028		return -1;
2029
2030	/*
2031	 * Leader must be already processed/open,
2032	 * if not it's a bug.
2033	 */
2034	BUG_ON(!leader->core.fd);
2035
2036	cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx);
2037	if (cpu_map_idx == -1)
2038		return -1;
2039
2040	fd = FD(leader, cpu_map_idx, thread);
2041	BUG_ON(fd == -1 && leader->supported);
2042
2043	/*
2044	 * When the leader has been skipped, return -2 to distinguish from no
2045	 * group leader case.
2046	 */
2047	return fd == -1 ? -2 : fd;
2048}
2049
2050static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx)
2051{
2052	for (int cpu = 0; cpu < nr_cpus; cpu++)
2053		for (int thread = thread_idx; thread < nr_threads - 1; thread++)
2054			FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
2055}
2056
2057static int update_fds(struct evsel *evsel,
2058		      int nr_cpus, int cpu_map_idx,
2059		      int nr_threads, int thread_idx)
2060{
2061	struct evsel *pos;
2062
2063	if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads)
2064		return -EINVAL;
2065
2066	evlist__for_each_entry(evsel->evlist, pos) {
2067		nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx;
2068
2069		evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
2070
2071		/*
2072		 * Since fds for next evsel has not been created,
2073		 * there is no need to iterate whole event list.
2074		 */
2075		if (pos == evsel)
2076			break;
2077	}
2078	return 0;
2079}
2080
2081static bool evsel__ignore_missing_thread(struct evsel *evsel,
2082					 int nr_cpus, int cpu_map_idx,
2083					 struct perf_thread_map *threads,
2084					 int thread, int err)
2085{
2086	pid_t ignore_pid = perf_thread_map__pid(threads, thread);
2087
2088	if (!evsel->ignore_missing_thread)
2089		return false;
2090
2091	/* The system wide setup does not work with threads. */
2092	if (evsel->core.system_wide)
2093		return false;
2094
2095	/* The -ESRCH is perf event syscall errno for pid's not found. */
2096	if (err != -ESRCH)
2097		return false;
2098
2099	/* If there's only one thread, let it fail. */
2100	if (threads->nr == 1)
2101		return false;
2102
2103	/*
2104	 * We should remove fd for missing_thread first
2105	 * because thread_map__remove() will decrease threads->nr.
2106	 */
2107	if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread))
2108		return false;
2109
2110	if (thread_map__remove(threads, thread))
2111		return false;
2112
2113	pr_warning("WARNING: Ignored open failure for pid %d\n",
2114		   ignore_pid);
2115	return true;
2116}
2117
2118static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
2119				void *priv __maybe_unused)
2120{
2121	return fprintf(fp, "  %-32s %s\n", name, val);
2122}
2123
2124static void display_attr(struct perf_event_attr *attr)
2125{
2126	if (verbose >= 2 || debug_peo_args) {
2127		fprintf(stderr, "%.60s\n", graph_dotted_line);
2128		fprintf(stderr, "perf_event_attr:\n");
2129		perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
2130		fprintf(stderr, "%.60s\n", graph_dotted_line);
2131	}
2132}
2133
2134bool evsel__precise_ip_fallback(struct evsel *evsel)
2135{
2136	/* Do not try less precise if not requested. */
2137	if (!evsel->precise_max)
2138		return false;
2139
2140	/*
2141	 * We tried all the precise_ip values, and it's
2142	 * still failing, so leave it to standard fallback.
2143	 */
2144	if (!evsel->core.attr.precise_ip) {
2145		evsel->core.attr.precise_ip = evsel->precise_ip_original;
2146		return false;
2147	}
2148
2149	if (!evsel->precise_ip_original)
2150		evsel->precise_ip_original = evsel->core.attr.precise_ip;
2151
2152	evsel->core.attr.precise_ip--;
2153	pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
2154	display_attr(&evsel->core.attr);
2155	return true;
2156}
2157
2158static struct perf_cpu_map *empty_cpu_map;
2159static struct perf_thread_map *empty_thread_map;
2160
2161static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
2162		struct perf_thread_map *threads)
2163{
2164	int ret = 0;
2165	int nthreads = perf_thread_map__nr(threads);
2166
2167	if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
2168	    (perf_missing_features.aux_output     && evsel->core.attr.aux_output))
2169		return -EINVAL;
2170
2171	if (cpus == NULL) {
2172		if (empty_cpu_map == NULL) {
2173			empty_cpu_map = perf_cpu_map__new_any_cpu();
2174			if (empty_cpu_map == NULL)
2175				return -ENOMEM;
2176		}
2177
2178		cpus = empty_cpu_map;
2179	}
2180
2181	if (threads == NULL) {
2182		if (empty_thread_map == NULL) {
2183			empty_thread_map = thread_map__new_by_tid(-1);
2184			if (empty_thread_map == NULL)
2185				return -ENOMEM;
2186		}
2187
2188		threads = empty_thread_map;
2189	}
2190
2191	if (evsel->core.fd == NULL &&
2192	    perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0)
2193		return -ENOMEM;
2194
2195	if (evsel__is_tool(evsel))
2196		ret = evsel__tool_pmu_prepare_open(evsel, cpus, nthreads);
2197
2198	evsel->open_flags = PERF_FLAG_FD_CLOEXEC;
2199	if (evsel->cgrp)
2200		evsel->open_flags |= PERF_FLAG_PID_CGROUP;
2201
2202	return ret;
2203}
2204
2205static void evsel__disable_missing_features(struct evsel *evsel)
2206{
2207	if (perf_missing_features.defer_callchain && evsel->core.attr.defer_callchain)
2208		evsel->core.attr.defer_callchain = 0;
2209	if (perf_missing_features.defer_callchain && evsel->core.attr.defer_output)
2210		evsel->core.attr.defer_output = 0;
2211	if (perf_missing_features.inherit_sample_read && evsel->core.attr.inherit &&
2212	    (evsel->core.attr.sample_type & PERF_SAMPLE_READ))
2213		evsel->core.attr.inherit = 0;
2214	if (perf_missing_features.branch_counters)
2215		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS;
2216	if (perf_missing_features.read_lost)
2217		evsel->core.attr.read_format &= ~PERF_FORMAT_LOST;
2218	if (perf_missing_features.weight_struct) {
2219		evsel__set_sample_bit(evsel, WEIGHT);
2220		evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
2221	}
2222	if (perf_missing_features.clockid_wrong)
2223		evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
2224	if (perf_missing_features.clockid) {
2225		evsel->core.attr.use_clockid = 0;
2226		evsel->core.attr.clockid = 0;
2227	}
2228	if (perf_missing_features.cloexec)
2229		evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
2230	if (perf_missing_features.mmap2)
2231		evsel->core.attr.mmap2 = 0;
2232	if (evsel->pmu && evsel->pmu->missing_features.exclude_guest)
2233		evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
2234	if (perf_missing_features.lbr_flags)
2235		evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
2236				     PERF_SAMPLE_BRANCH_NO_CYCLES);
2237	if (perf_missing_features.group_read && evsel->core.attr.inherit)
2238		evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
2239	if (perf_missing_features.ksymbol)
2240		evsel->core.attr.ksymbol = 0;
2241	if (perf_missing_features.bpf)
2242		evsel->core.attr.bpf_event = 0;
2243	if (perf_missing_features.branch_hw_idx)
2244		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
2245	if (perf_missing_features.sample_id_all)
2246		evsel->core.attr.sample_id_all = 0;
2247}
2248
2249int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
2250			struct perf_thread_map *threads)
2251{
2252	int err;
2253
2254	err = __evsel__prepare_open(evsel, cpus, threads);
2255	if (err)
2256		return err;
2257
2258	evsel__disable_missing_features(evsel);
2259
2260	return err;
2261}
2262
2263static bool __has_attr_feature(struct perf_event_attr *attr,
2264			       struct perf_cpu cpu, unsigned long flags)
2265{
2266	int fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
2267			 /*group_fd=*/-1, flags);
2268	close(fd);
2269
2270	if (fd < 0) {
2271		attr->exclude_kernel = 1;
2272
2273		fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
2274			     /*group_fd=*/-1, flags);
2275		close(fd);
2276	}
2277
2278	if (fd < 0) {
2279		attr->exclude_hv = 1;
2280
2281		fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
2282			     /*group_fd=*/-1, flags);
2283		close(fd);
2284	}
2285
2286	if (fd < 0) {
2287		attr->exclude_guest = 1;
2288
2289		fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
2290			     /*group_fd=*/-1, flags);
2291		close(fd);
2292	}
2293
2294	attr->exclude_kernel = 0;
2295	attr->exclude_guest = 0;
2296	attr->exclude_hv = 0;
2297
2298	return fd >= 0;
2299}
2300
2301static bool has_attr_feature(struct perf_event_attr *attr, unsigned long flags)
2302{
2303	struct perf_cpu cpu = {.cpu = -1};
2304
2305	return __has_attr_feature(attr, cpu, flags);
2306}
2307
2308static void evsel__detect_missing_pmu_features(struct evsel *evsel)
2309{
2310	struct perf_event_attr attr = {
2311		.type = evsel->core.attr.type,
2312		.config = evsel->core.attr.config,
2313		.disabled = 1,
2314	};
2315	struct perf_pmu *pmu = evsel->pmu;
2316	int old_errno;
2317
2318	old_errno = errno;
2319
2320	if (pmu == NULL)
2321		pmu = evsel->pmu = evsel__find_pmu(evsel);
2322
2323	if (pmu == NULL || pmu->missing_features.checked)
2324		goto out;
2325
2326	/*
2327	 * Must probe features in the order they were added to the
2328	 * perf_event_attr interface.  These are kernel core limitation but
2329	 * specific to PMUs with branch stack.  So we can detect with the given
2330	 * hardware event and stop on the first one succeeded.
2331	 */
2332
2333	/* Please add new feature detection here. */
2334
2335	attr.exclude_guest = 1;
2336	if (has_attr_feature(&attr, /*flags=*/0))
2337		goto found;
2338	pmu->missing_features.exclude_guest = true;
2339	pr_debug2("switching off exclude_guest for PMU %s\n", pmu->name);
2340
2341found:
2342	pmu->missing_features.checked = true;
2343out:
2344	errno = old_errno;
2345}
2346
2347static void evsel__detect_missing_brstack_features(struct evsel *evsel)
2348{
2349	static bool detection_done = false;
2350	struct perf_event_attr attr = {
2351		.type = evsel->core.attr.type,
2352		.config = evsel->core.attr.config,
2353		.disabled = 1,
2354		.sample_type = PERF_SAMPLE_BRANCH_STACK,
2355		.sample_period = 1000,
2356	};
2357	int old_errno;
2358
2359	if (detection_done)
2360		return;
2361
2362	old_errno = errno;
2363
2364	/*
2365	 * Must probe features in the order they were added to the
2366	 * perf_event_attr interface.  These are PMU specific limitation
2367	 * so we can detect with the given hardware event and stop on the
2368	 * first one succeeded.
2369	 */
2370
2371	/* Please add new feature detection here. */
2372
2373	attr.branch_sample_type = PERF_SAMPLE_BRANCH_COUNTERS;
2374	if (has_attr_feature(&attr, /*flags=*/0))
2375		goto found;
2376	perf_missing_features.branch_counters = true;
2377	pr_debug2("switching off branch counters support\n");
2378
2379	attr.branch_sample_type = PERF_SAMPLE_BRANCH_HW_INDEX;
2380	if (has_attr_feature(&attr, /*flags=*/0))
2381		goto found;
2382	perf_missing_features.branch_hw_idx = true;
2383	pr_debug2("switching off branch HW index support\n");
2384
2385	attr.branch_sample_type = PERF_SAMPLE_BRANCH_NO_CYCLES | PERF_SAMPLE_BRANCH_NO_FLAGS;
2386	if (has_attr_feature(&attr, /*flags=*/0))
2387		goto found;
2388	perf_missing_features.lbr_flags = true;
2389	pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
2390
2391found:
2392	detection_done = true;
2393	errno = old_errno;
2394}
2395
2396static bool evsel__probe_aux_action(struct evsel *evsel, struct perf_cpu cpu)
2397{
2398	struct perf_event_attr attr = evsel->core.attr;
2399	int old_errno = errno;
2400
2401	attr.disabled = 1;
2402	attr.aux_start_paused = 1;
2403
2404	if (__has_attr_feature(&attr, cpu, /*flags=*/0)) {
2405		errno = old_errno;
2406		return true;
2407	}
2408
2409	/*
2410	 * EOPNOTSUPP means the kernel supports the feature but the PMU does
2411	 * not, so keep that distinction if possible.
2412	 */
2413	if (errno != EOPNOTSUPP)
2414		errno = old_errno;
2415
2416	return false;
2417}
2418
2419static void evsel__detect_missing_aux_action_feature(struct evsel *evsel, struct perf_cpu cpu)
2420{
2421	static bool detection_done;
2422	struct evsel *leader;
2423
2424	/*
2425	 * Don't bother probing aux_action if it is not being used or has been
2426	 * probed before.
2427	 */
2428	if (!evsel->core.attr.aux_action || detection_done)
2429		return;
2430
2431	detection_done = true;
2432
2433	/*
2434	 * The leader is an AUX area event. If it has failed, assume the feature
2435	 * is not supported.
2436	 */
2437	leader = evsel__leader(evsel);
2438	if (evsel == leader) {
2439		perf_missing_features.aux_action = true;
2440		return;
2441	}
2442
2443	/*
2444	 * AUX area event with aux_action must have been opened successfully
2445	 * already, so feature is supported.
2446	 */
2447	if (leader->core.attr.aux_action)
2448		return;
2449
2450	if (!evsel__probe_aux_action(leader, cpu))
2451		perf_missing_features.aux_action = true;
2452}
2453
2454static bool evsel__detect_missing_features(struct evsel *evsel, struct perf_cpu cpu)
2455{
2456	static bool detection_done = false;
2457	struct perf_event_attr attr = {
2458		.type = PERF_TYPE_SOFTWARE,
2459		.config = PERF_COUNT_SW_TASK_CLOCK,
2460		.disabled = 1,
2461	};
2462	int old_errno;
2463
2464	evsel__detect_missing_aux_action_feature(evsel, cpu);
2465
2466	evsel__detect_missing_pmu_features(evsel);
2467
2468	if (evsel__has_br_stack(evsel))
2469		evsel__detect_missing_brstack_features(evsel);
2470
2471	if (detection_done)
2472		goto check;
2473
2474	old_errno = errno;
2475
2476	/*
2477	 * Must probe features in the order they were added to the
2478	 * perf_event_attr interface.  These are kernel core limitation
2479	 * not PMU-specific so we can detect with a software event and
2480	 * stop on the first one succeeded.
2481	 */
2482
2483	/* Please add new feature detection here. */
2484
2485	attr.defer_callchain = true;
2486	if (has_attr_feature(&attr, /*flags=*/0))
2487		goto found;
2488	perf_missing_features.defer_callchain = true;
2489	pr_debug2("switching off deferred callchain support\n");
2490	attr.defer_callchain = false;
2491
2492	attr.inherit = true;
2493	attr.sample_type = PERF_SAMPLE_READ | PERF_SAMPLE_TID;
2494	if (has_attr_feature(&attr, /*flags=*/0))
2495		goto found;
2496	perf_missing_features.inherit_sample_read = true;
2497	pr_debug2("Using PERF_SAMPLE_READ / :S modifier is not compatible with inherit, falling back to no-inherit.\n");
2498	attr.inherit = false;
2499	attr.sample_type = 0;
2500
2501	attr.read_format = PERF_FORMAT_LOST;
2502	if (has_attr_feature(&attr, /*flags=*/0))
2503		goto found;
2504	perf_missing_features.read_lost = true;
2505	pr_debug2("switching off PERF_FORMAT_LOST support\n");
2506	attr.read_format = 0;
2507
2508	attr.sample_type = PERF_SAMPLE_WEIGHT_STRUCT;
2509	if (has_attr_feature(&attr, /*flags=*/0))
2510		goto found;
2511	perf_missing_features.weight_struct = true;
2512	pr_debug2("switching off weight struct support\n");
2513	attr.sample_type = 0;
2514
2515	attr.sample_type = PERF_SAMPLE_CODE_PAGE_SIZE;
2516	if (has_attr_feature(&attr, /*flags=*/0))
2517		goto found;
2518	perf_missing_features.code_page_size = true;
2519	pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support\n");
2520	attr.sample_type = 0;
2521
2522	attr.sample_type = PERF_SAMPLE_DATA_PAGE_SIZE;
2523	if (has_attr_feature(&attr, /*flags=*/0))
2524		goto found;
2525	perf_missing_features.data_page_size = true;
2526	pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support\n");
2527	attr.sample_type = 0;
2528
2529	attr.cgroup = 1;
2530	if (has_attr_feature(&attr, /*flags=*/0))
2531		goto found;
2532	perf_missing_features.cgroup = true;
2533	pr_debug2_peo("Kernel has no cgroup sampling support\n");
2534	attr.cgroup = 0;
2535
2536	attr.aux_output = 1;
2537	if (has_attr_feature(&attr, /*flags=*/0))
2538		goto found;
2539	perf_missing_features.aux_output = true;
2540	pr_debug2_peo("Kernel has no attr.aux_output support\n");
2541	attr.aux_output = 0;
2542
2543	attr.bpf_event = 1;
2544	if (has_attr_feature(&attr, /*flags=*/0))
2545		goto found;
2546	perf_missing_features.bpf = true;
2547	pr_debug2_peo("switching off bpf_event\n");
2548	attr.bpf_event = 0;
2549
2550	attr.ksymbol = 1;
2551	if (has_attr_feature(&attr, /*flags=*/0))
2552		goto found;
2553	perf_missing_features.ksymbol = true;
2554	pr_debug2_peo("switching off ksymbol\n");
2555	attr.ksymbol = 0;
2556
2557	attr.write_backward = 1;
2558	if (has_attr_feature(&attr, /*flags=*/0))
2559		goto found;
2560	perf_missing_features.write_backward = true;
2561	pr_debug2_peo("switching off write_backward\n");
2562	attr.write_backward = 0;
2563
2564	attr.use_clockid = 1;
2565	attr.clockid = CLOCK_MONOTONIC;
2566	if (has_attr_feature(&attr, /*flags=*/0))
2567		goto found;
2568	perf_missing_features.clockid = true;
2569	pr_debug2_peo("switching off clockid\n");
2570	attr.use_clockid = 0;
2571	attr.clockid = 0;
2572
2573	if (has_attr_feature(&attr, /*flags=*/PERF_FLAG_FD_CLOEXEC))
2574		goto found;
2575	perf_missing_features.cloexec = true;
2576	pr_debug2_peo("switching off cloexec flag\n");
2577
2578	attr.mmap2 = 1;
2579	if (has_attr_feature(&attr, /*flags=*/0))
2580		goto found;
2581	perf_missing_features.mmap2 = true;
2582	pr_debug2_peo("switching off mmap2\n");
2583	attr.mmap2 = 0;
2584
2585	/* set this unconditionally? */
2586	perf_missing_features.sample_id_all = true;
2587	pr_debug2_peo("switching off sample_id_all\n");
2588
2589	attr.inherit = 1;
2590	attr.read_format = PERF_FORMAT_GROUP;
2591	if (has_attr_feature(&attr, /*flags=*/0))
2592		goto found;
2593	perf_missing_features.group_read = true;
2594	pr_debug2_peo("switching off group read\n");
2595	attr.inherit = 0;
2596	attr.read_format = 0;
2597
2598found:
2599	detection_done = true;
2600	errno = old_errno;
2601
2602check:
2603	if ((evsel->core.attr.defer_callchain || evsel->core.attr.defer_output) &&
2604	    perf_missing_features.defer_callchain)
2605		return true;
2606
2607	if (evsel->core.attr.inherit &&
2608	    (evsel->core.attr.sample_type & PERF_SAMPLE_READ) &&
2609	    perf_missing_features.inherit_sample_read)
2610		return true;
2611
2612	if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) &&
2613	    perf_missing_features.branch_counters)
2614		return true;
2615
2616	if ((evsel->core.attr.read_format & PERF_FORMAT_LOST) &&
2617	    perf_missing_features.read_lost)
2618		return true;
2619
2620	if ((evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT) &&
2621	    perf_missing_features.weight_struct)
2622		return true;
2623
2624	if (evsel->core.attr.use_clockid && evsel->core.attr.clockid != CLOCK_MONOTONIC &&
2625	    !perf_missing_features.clockid) {
2626		perf_missing_features.clockid_wrong = true;
2627		return true;
2628	}
2629
2630	if (evsel->core.attr.use_clockid && perf_missing_features.clockid)
2631		return true;
2632
2633	if ((evsel->open_flags & PERF_FLAG_FD_CLOEXEC) &&
2634	    perf_missing_features.cloexec)
2635		return true;
2636
2637	if (evsel->core.attr.mmap2 && perf_missing_features.mmap2)
2638		return true;
2639
2640	if ((evsel->core.attr.branch_sample_type & (PERF_SAMPLE_BRANCH_NO_FLAGS |
2641						    PERF_SAMPLE_BRANCH_NO_CYCLES)) &&
2642	    perf_missing_features.lbr_flags)
2643		return true;
2644
2645	if (evsel->core.attr.inherit && (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
2646	    perf_missing_features.group_read)
2647		return true;
2648
2649	if (evsel->core.attr.ksymbol && perf_missing_features.ksymbol)
2650		return true;
2651
2652	if (evsel->core.attr.bpf_event && perf_missing_features.bpf)
2653		return true;
2654
2655	if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX) &&
2656	    perf_missing_features.branch_hw_idx)
2657		return true;
2658
2659	if (evsel->core.attr.sample_id_all && perf_missing_features.sample_id_all)
2660		return true;
2661
2662	return false;
2663}
2664
2665static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
2666		struct perf_thread_map *threads,
2667		int start_cpu_map_idx, int end_cpu_map_idx)
2668{
2669	int idx, thread, nthreads;
2670	int pid = -1, err, old_errno;
2671	enum rlimit_action set_rlimit = NO_CHANGE;
2672	struct perf_cpu cpu;
2673
2674	if (evsel__is_retire_lat(evsel)) {
2675		err = evsel__tpebs_open(evsel);
2676		goto out;
2677	}
2678
2679	err = __evsel__prepare_open(evsel, cpus, threads);
2680	if (err)
2681		goto out;
2682
2683	if (cpus == NULL)
2684		cpus = empty_cpu_map;
2685
2686	if (threads == NULL)
2687		threads = empty_thread_map;
2688
2689	nthreads = perf_thread_map__nr(threads);
2690
2691	if (evsel->cgrp)
2692		pid = evsel->cgrp->fd;
2693
2694fallback_missing_features:
2695	evsel__disable_missing_features(evsel);
2696
2697	pr_debug3("Opening: %s\n", evsel__name(evsel));
2698	display_attr(&evsel->core.attr);
2699
2700	if (evsel__is_tool(evsel)) {
2701		err = evsel__tool_pmu_open(evsel, threads,
2702					   start_cpu_map_idx,
2703					   end_cpu_map_idx);
2704		goto out;
2705	}
2706	if (evsel__is_hwmon(evsel)) {
2707		err = evsel__hwmon_pmu_open(evsel, threads,
2708					    start_cpu_map_idx,
2709					    end_cpu_map_idx);
2710		goto out;
2711	}
2712	if (evsel__is_drm(evsel)) {
2713		err = evsel__drm_pmu_open(evsel, threads,
2714					  start_cpu_map_idx,
2715					  end_cpu_map_idx);
2716		goto out;
2717	}
2718
2719	for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) {
2720		cpu = perf_cpu_map__cpu(cpus, idx);
2721
2722		for (thread = 0; thread < nthreads; thread++) {
2723			int fd, group_fd;
2724retry_open:
2725			if (thread >= nthreads)
2726				break;
2727
2728			if (!evsel->cgrp && !evsel->core.system_wide)
2729				pid = perf_thread_map__pid(threads, thread);
2730
2731			group_fd = get_group_fd(evsel, idx, thread);
2732
2733			if (group_fd == -2) {
2734				pr_debug("broken group leader for %s\n", evsel->name);
2735				err = -EINVAL;
2736				goto out_close;
2737			}
2738
2739			/* Debug message used by test scripts */
2740			pr_debug2_peo("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
2741				pid, cpu.cpu, group_fd, evsel->open_flags);
2742
2743			fd = sys_perf_event_open(&evsel->core.attr, pid, cpu.cpu,
2744						group_fd, evsel->open_flags);
2745
2746			FD(evsel, idx, thread) = fd;
2747
2748			if (fd < 0) {
2749				err = -errno;
2750
2751				pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
2752					  err);
2753				goto try_fallback;
2754			}
2755
2756			bpf_counter__install_pe(evsel, idx, fd);
2757
2758			if (unlikely(test_attr__enabled())) {
2759				test_attr__open(&evsel->core.attr, pid, cpu,
2760						fd, group_fd, evsel->open_flags);
2761			}
2762
2763			/* Debug message used by test scripts */
2764			pr_debug2_peo(" = %d\n", fd);
2765
2766			if (evsel->bpf_fd >= 0) {
2767				int evt_fd = fd;
2768				int bpf_fd = evsel->bpf_fd;
2769
2770				err = ioctl(evt_fd,
2771					    PERF_EVENT_IOC_SET_BPF,
2772					    bpf_fd);
2773				if (err && errno != EEXIST) {
2774					pr_err("failed to attach bpf fd %d: %s\n",
2775					       bpf_fd, strerror(errno));
2776					err = -EINVAL;
2777					goto out_close;
2778				}
2779			}
2780
2781			set_rlimit = NO_CHANGE;
2782
2783			/*
2784			 * If we succeeded but had to kill clockid, fail and
2785			 * have evsel__open_strerror() print us a nice error.
2786			 */
2787			if (perf_missing_features.clockid ||
2788			    perf_missing_features.clockid_wrong) {
2789				err = -EINVAL;
2790				goto out_close;
2791			}
2792		}
2793	}
2794
2795	err = 0;
2796	goto out;
2797
2798try_fallback:
2799	if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus),
2800					 idx, threads, thread, err)) {
2801		/* We just removed 1 thread, so lower the upper nthreads limit. */
2802		nthreads--;
2803
2804		/* ... and pretend like nothing have happened. */
2805		err = 0;
2806		goto retry_open;
2807	}
2808	/*
2809	 * perf stat needs between 5 and 22 fds per CPU. When we run out
2810	 * of them try to increase the limits.
2811	 */
2812	if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit))
2813		goto retry_open;
2814
2815	if (err == -EINVAL && evsel__detect_missing_features(evsel, cpu))
2816		goto fallback_missing_features;
2817
2818	if (evsel__precise_ip_fallback(evsel))
2819		goto retry_open;
2820
2821out_close:
2822	if (err)
2823		threads->err_thread = thread;
2824
2825	old_errno = errno;
2826	do {
2827		while (--thread >= 0) {
2828			if (FD(evsel, idx, thread) >= 0)
2829				close(FD(evsel, idx, thread));
2830			FD(evsel, idx, thread) = -1;
2831		}
2832		thread = nthreads;
2833	} while (--idx >= 0);
2834	errno = old_errno;
2835out:
2836	if (err)
2837		evsel->supported = false;
2838	return err;
2839}
2840
2841int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
2842		struct perf_thread_map *threads)
2843{
2844	return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus));
2845}
2846
2847void evsel__close(struct evsel *evsel)
2848{
2849	if (evsel__is_retire_lat(evsel))
2850		evsel__tpebs_close(evsel);
2851	perf_evsel__close(&evsel->core);
2852	perf_evsel__free_id(&evsel->core);
2853}
2854
2855int evsel__open_per_cpu_and_thread(struct evsel *evsel,
2856				   struct perf_cpu_map *cpus, int cpu_map_idx,
2857				   struct perf_thread_map *threads)
2858{
2859	if (cpu_map_idx == -1)
2860		return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus));
2861
2862	return evsel__open_cpu(evsel, cpus, threads, cpu_map_idx, cpu_map_idx + 1);
2863}
2864
2865int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx)
2866{
2867	struct perf_thread_map *threads = thread_map__new_by_tid(-1);
2868	int ret = evsel__open_per_cpu_and_thread(evsel, cpus, cpu_map_idx, threads);
2869
2870	perf_thread_map__put(threads);
2871	return ret;
2872}
2873
2874int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
2875{
2876	struct perf_cpu_map *cpus = perf_cpu_map__new_any_cpu();
2877	int ret = evsel__open_per_cpu_and_thread(evsel, cpus, -1, threads);
2878
2879	perf_cpu_map__put(cpus);
2880	return ret;
2881}
2882
2883static int perf_evsel__parse_id_sample(const struct evsel *evsel,
2884				       const union perf_event *event,
2885				       struct perf_sample *sample)
2886{
2887	u64 type = evsel->core.attr.sample_type;
2888	const __u64 *array = event->sample.array;
2889	bool swapped = evsel->needs_swap;
2890	union u64_swap u;
2891
2892	array += ((event->header.size -
2893		   sizeof(event->header)) / sizeof(u64)) - 1;
2894
2895	if (type & PERF_SAMPLE_IDENTIFIER) {
2896		sample->id = *array;
2897		array--;
2898	}
2899
2900	if (type & PERF_SAMPLE_CPU) {
2901		u.val64 = *array;
2902		if (swapped) {
2903			/* undo swap of u64, then swap on individual u32s */
2904			u.val64 = bswap_64(u.val64);
2905			u.val32[0] = bswap_32(u.val32[0]);
2906		}
2907
2908		sample->cpu = u.val32[0];
2909		array--;
2910	}
2911
2912	if (type & PERF_SAMPLE_STREAM_ID) {
2913		sample->stream_id = *array;
2914		array--;
2915	}
2916
2917	if (type & PERF_SAMPLE_ID) {
2918		sample->id = *array;
2919		array--;
2920	}
2921
2922	if (type & PERF_SAMPLE_TIME) {
2923		sample->time = *array;
2924		array--;
2925	}
2926
2927	if (type & PERF_SAMPLE_TID) {
2928		u.val64 = *array;
2929		if (swapped) {
2930			/* undo swap of u64, then swap on individual u32s */
2931			u.val64 = bswap_64(u.val64);
2932			u.val32[0] = bswap_32(u.val32[0]);
2933			u.val32[1] = bswap_32(u.val32[1]);
2934		}
2935
2936		sample->pid = u.val32[0];
2937		sample->tid = u.val32[1];
2938		array--;
2939	}
2940
2941	return 0;
2942}
2943
2944static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2945			    u64 size)
2946{
2947	return size > max_size || offset + size > endp;
2948}
2949
2950#define OVERFLOW_CHECK(offset, size, max_size)				\
2951	do {								\
2952		if (overflow(endp, (max_size), (offset), (size)))	\
2953			return -EFAULT;					\
2954	} while (0)
2955
2956#define OVERFLOW_CHECK_u64(offset) \
2957	OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2958
2959static int
2960perf_event__check_size(union perf_event *event, unsigned int sample_size)
2961{
2962	/*
2963	 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2964	 * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
2965	 * check the format does not go past the end of the event.
2966	 */
2967	if (sample_size + sizeof(event->header) > event->header.size)
2968		return -EFAULT;
2969
2970	return 0;
2971}
2972
2973static void perf_parse_sample_weight(struct perf_sample *data, const __u64 *array, u64 type)
2974{
2975	union perf_sample_weight weight;
2976
2977	weight.full = *array;
2978	if (type & PERF_SAMPLE_WEIGHT_STRUCT) {
2979		data->weight = weight.var1_dw;
2980		data->ins_lat = weight.var2_w;
2981		data->weight3 = weight.var3_w;
2982	} else {
2983		data->weight = weight.full;
2984	}
2985}
2986
2987u64 evsel__bitfield_swap_branch_flags(u64 value)
2988{
2989	u64 new_val = 0;
2990
2991	/*
2992	 * branch_flags
2993	 * union {
2994	 * 	u64 values;
2995	 * 	struct {
2996	 * 		mispred:1	//target mispredicted
2997	 * 		predicted:1	//target predicted
2998	 * 		in_tx:1		//in transaction
2999	 * 		abort:1		//transaction abort
3000	 * 		cycles:16	//cycle count to last branch
3001	 * 		type:4		//branch type
3002	 * 		spec:2		//branch speculation info
3003	 * 		new_type:4	//additional branch type
3004	 * 		priv:3		//privilege level
3005	 * 		reserved:31
3006	 * 	}
3007	 * }
3008	 *
3009	 * Avoid bswap64() the entire branch_flag.value,
3010	 * as it has variable bit-field sizes. Instead the
3011	 * macro takes the bit-field position/size,
3012	 * swaps it based on the host endianness.
3013	 */
3014	if (host_is_bigendian()) {
3015		new_val = bitfield_swap(value, 0, 1);
3016		new_val |= bitfield_swap(value, 1, 1);
3017		new_val |= bitfield_swap(value, 2, 1);
3018		new_val |= bitfield_swap(value, 3, 1);
3019		new_val |= bitfield_swap(value, 4, 16);
3020		new_val |= bitfield_swap(value, 20, 4);
3021		new_val |= bitfield_swap(value, 24, 2);
3022		new_val |= bitfield_swap(value, 26, 4);
3023		new_val |= bitfield_swap(value, 30, 3);
3024		new_val |= bitfield_swap(value, 33, 31);
3025	} else {
3026		new_val = bitfield_swap(value, 63, 1);
3027		new_val |= bitfield_swap(value, 62, 1);
3028		new_val |= bitfield_swap(value, 61, 1);
3029		new_val |= bitfield_swap(value, 60, 1);
3030		new_val |= bitfield_swap(value, 44, 16);
3031		new_val |= bitfield_swap(value, 40, 4);
3032		new_val |= bitfield_swap(value, 38, 2);
3033		new_val |= bitfield_swap(value, 34, 4);
3034		new_val |= bitfield_swap(value, 31, 3);
3035		new_val |= bitfield_swap(value, 0, 31);
3036	}
3037
3038	return new_val;
3039}
3040
3041static inline bool evsel__has_branch_counters(const struct evsel *evsel)
3042{
3043	struct evsel *leader = evsel__leader(evsel);
3044
3045	/* The branch counters feature only supports group */
3046	if (!leader || !evsel->evlist)
3047		return false;
3048
3049	if (evsel->evlist->nr_br_cntr < 0)
3050		evlist__update_br_cntr(evsel->evlist);
3051
3052	if (leader->br_cntr_nr > 0)
3053		return true;
3054
3055	return false;
3056}
3057
3058static int __set_offcpu_sample(struct perf_sample *data)
3059{
3060	u64 *array = data->raw_data;
3061	u32 max_size = data->raw_size, *p32;
3062	const void *endp = (void *)array + max_size;
3063
3064	if (array == NULL)
3065		return -EFAULT;
3066
3067	OVERFLOW_CHECK_u64(array);
3068	p32 = (void *)array++;
3069	data->pid = p32[0];
3070	data->tid = p32[1];
3071
3072	OVERFLOW_CHECK_u64(array);
3073	data->period = *array++;
3074
3075	OVERFLOW_CHECK_u64(array);
3076	data->callchain = (struct ip_callchain *)array++;
3077	OVERFLOW_CHECK(array, data->callchain->nr * sizeof(u64), max_size);
3078	data->ip = data->callchain->ips[1];
3079	array += data->callchain->nr;
3080
3081	OVERFLOW_CHECK_u64(array);
3082	data->cgroup = *array;
3083
3084	return 0;
3085}
3086
3087int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
3088			struct perf_sample *data)
3089{
3090	u64 type = evsel->core.attr.sample_type;
3091	bool swapped = evsel->needs_swap;
3092	const __u64 *array;
3093	u16 max_size = event->header.size;
3094	const void *endp = (void *)event + max_size;
3095	u64 sz;
3096
3097	/*
3098	 * used for cross-endian analysis. See git commit 65014ab3
3099	 * for why this goofiness is needed.
3100	 */
3101	union u64_swap u;
3102
3103	memset(data, 0, sizeof(*data));
3104	data->cpu = data->pid = data->tid = -1;
3105	data->stream_id = data->id = data->time = -1ULL;
3106	data->period = evsel->core.attr.sample_period;
3107	data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
3108	data->misc    = event->header.misc;
3109	data->data_src = PERF_MEM_DATA_SRC_NONE;
3110	data->vcpu = -1;
3111
3112	if (event->header.type == PERF_RECORD_CALLCHAIN_DEFERRED) {
3113		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
3114
3115		data->callchain = (struct ip_callchain *)&event->callchain_deferred.nr;
3116		if (data->callchain->nr > max_callchain_nr)
3117			return -EFAULT;
3118
3119		data->deferred_cookie = event->callchain_deferred.cookie;
3120
3121		if (evsel->core.attr.sample_id_all)
3122			perf_evsel__parse_id_sample(evsel, event, data);
3123		return 0;
3124	}
3125
3126	if (event->header.type != PERF_RECORD_SAMPLE) {
3127		if (!evsel->core.attr.sample_id_all)
3128			return 0;
3129		return perf_evsel__parse_id_sample(evsel, event, data);
3130	}
3131
3132	array = event->sample.array;
3133
3134	if (perf_event__check_size(event, evsel->sample_size))
3135		return -EFAULT;
3136
3137	if (type & PERF_SAMPLE_IDENTIFIER) {
3138		data->id = *array;
3139		array++;
3140	}
3141
3142	if (type & PERF_SAMPLE_IP) {
3143		data->ip = *array;
3144		array++;
3145	}
3146
3147	if (type & PERF_SAMPLE_TID) {
3148		u.val64 = *array;
3149		if (swapped) {
3150			/* undo swap of u64, then swap on individual u32s */
3151			u.val64 = bswap_64(u.val64);
3152			u.val32[0] = bswap_32(u.val32[0]);
3153			u.val32[1] = bswap_32(u.val32[1]);
3154		}
3155
3156		data->pid = u.val32[0];
3157		data->tid = u.val32[1];
3158		array++;
3159	}
3160
3161	if (type & PERF_SAMPLE_TIME) {
3162		data->time = *array;
3163		array++;
3164	}
3165
3166	if (type & PERF_SAMPLE_ADDR) {
3167		data->addr = *array;
3168		array++;
3169	}
3170
3171	if (type & PERF_SAMPLE_ID) {
3172		data->id = *array;
3173		array++;
3174	}
3175
3176	if (type & PERF_SAMPLE_STREAM_ID) {
3177		data->stream_id = *array;
3178		array++;
3179	}
3180
3181	if (type & PERF_SAMPLE_CPU) {
3182
3183		u.val64 = *array;
3184		if (swapped) {
3185			/* undo swap of u64, then swap on individual u32s */
3186			u.val64 = bswap_64(u.val64);
3187			u.val32[0] = bswap_32(u.val32[0]);
3188		}
3189
3190		data->cpu = u.val32[0];
3191		array++;
3192	}
3193
3194	if (type & PERF_SAMPLE_PERIOD) {
3195		data->period = *array;
3196		array++;
3197	}
3198
3199	if (type & PERF_SAMPLE_READ) {
3200		u64 read_format = evsel->core.attr.read_format;
3201
3202		OVERFLOW_CHECK_u64(array);
3203		if (read_format & PERF_FORMAT_GROUP)
3204			data->read.group.nr = *array;
3205		else
3206			data->read.one.value = *array;
3207
3208		array++;
3209
3210		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
3211			OVERFLOW_CHECK_u64(array);
3212			data->read.time_enabled = *array;
3213			array++;
3214		}
3215
3216		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
3217			OVERFLOW_CHECK_u64(array);
3218			data->read.time_running = *array;
3219			array++;
3220		}
3221
3222		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
3223		if (read_format & PERF_FORMAT_GROUP) {
3224			const u64 max_group_nr = UINT64_MAX /
3225					sizeof(struct sample_read_value);
3226
3227			if (data->read.group.nr > max_group_nr)
3228				return -EFAULT;
3229
3230			sz = data->read.group.nr * sample_read_value_size(read_format);
3231			OVERFLOW_CHECK(array, sz, max_size);
3232			data->read.group.values =
3233					(struct sample_read_value *)array;
3234			array = (void *)array + sz;
3235		} else {
3236			OVERFLOW_CHECK_u64(array);
3237			data->read.one.id = *array;
3238			array++;
3239
3240			if (read_format & PERF_FORMAT_LOST) {
3241				OVERFLOW_CHECK_u64(array);
3242				data->read.one.lost = *array;
3243				array++;
3244			}
3245		}
3246	}
3247
3248	if (type & PERF_SAMPLE_CALLCHAIN) {
3249		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
3250		u64 callchain_nr;
3251
3252		OVERFLOW_CHECK_u64(array);
3253		data->callchain = (struct ip_callchain *)array++;
3254		callchain_nr = data->callchain->nr;
3255		if (callchain_nr > max_callchain_nr)
3256			return -EFAULT;
3257		sz = callchain_nr * sizeof(u64);
3258		/*
3259		 * Save the cookie for the deferred user callchain.  The last 2
3260		 * entries in the callchain should be the context marker and the
3261		 * cookie.  The cookie will be used to match PERF_RECORD_
3262		 * CALLCHAIN_DEFERRED later.
3263		 */
3264		if (evsel->core.attr.defer_callchain && callchain_nr >= 2 &&
3265		    data->callchain->ips[callchain_nr - 2] == PERF_CONTEXT_USER_DEFERRED) {
3266			data->deferred_cookie = data->callchain->ips[callchain_nr - 1];
3267			data->deferred_callchain = true;
3268		}
3269		OVERFLOW_CHECK(array, sz, max_size);
3270		array = (void *)array + sz;
3271	}
3272
3273	if (type & PERF_SAMPLE_RAW) {
3274		OVERFLOW_CHECK_u64(array);
3275		u.val64 = *array;
3276
3277		/*
3278		 * Undo swap of u64, then swap on individual u32s,
3279		 * get the size of the raw area and undo all of the
3280		 * swap. The pevent interface handles endianness by
3281		 * itself.
3282		 */
3283		if (swapped) {
3284			u.val64 = bswap_64(u.val64);
3285			u.val32[0] = bswap_32(u.val32[0]);
3286			u.val32[1] = bswap_32(u.val32[1]);
3287		}
3288		data->raw_size = u.val32[0];
3289
3290		/*
3291		 * The raw data is aligned on 64bits including the
3292		 * u32 size, so it's safe to use mem_bswap_64.
3293		 */
3294		if (swapped)
3295			mem_bswap_64((void *) array, data->raw_size);
3296
3297		array = (void *)array + sizeof(u32);
3298
3299		OVERFLOW_CHECK(array, data->raw_size, max_size);
3300		data->raw_data = (void *)array;
3301		array = (void *)array + data->raw_size;
3302	}
3303
3304	if (type & PERF_SAMPLE_BRANCH_STACK) {
3305		const u64 max_branch_nr = UINT64_MAX /
3306					  sizeof(struct branch_entry);
3307		struct branch_entry *e;
3308		unsigned int i;
3309
3310		OVERFLOW_CHECK_u64(array);
3311		data->branch_stack = (struct branch_stack *)array++;
3312
3313		if (data->branch_stack->nr > max_branch_nr)
3314			return -EFAULT;
3315
3316		sz = data->branch_stack->nr * sizeof(struct branch_entry);
3317		if (evsel__has_branch_hw_idx(evsel)) {
3318			sz += sizeof(u64);
3319			e = &data->branch_stack->entries[0];
3320		} else {
3321			data->no_hw_idx = true;
3322			/*
3323			 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied,
3324			 * only nr and entries[] will be output by kernel.
3325			 */
3326			e = (struct branch_entry *)&data->branch_stack->hw_idx;
3327		}
3328
3329		if (swapped) {
3330			/*
3331			 * struct branch_flag does not have endian
3332			 * specific bit field definition. And bswap
3333			 * will not resolve the issue, since these
3334			 * are bit fields.
3335			 *
3336			 * evsel__bitfield_swap_branch_flags() uses a
3337			 * bitfield_swap macro to swap the bit position
3338			 * based on the host endians.
3339			 */
3340			for (i = 0; i < data->branch_stack->nr; i++, e++)
3341				e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value);
3342		}
3343
3344		OVERFLOW_CHECK(array, sz, max_size);
3345		array = (void *)array + sz;
3346
3347		if (evsel__has_branch_counters(evsel)) {
3348			data->branch_stack_cntr = (u64 *)array;
3349			sz = data->branch_stack->nr * sizeof(u64);
3350
3351			OVERFLOW_CHECK(array, sz, max_size);
3352			array = (void *)array + sz;
3353		}
3354	}
3355
3356	if (type & PERF_SAMPLE_REGS_USER) {
3357		struct regs_dump *regs = perf_sample__user_regs(data);
3358
3359		OVERFLOW_CHECK_u64(array);
3360		regs->abi = *array;
3361		array++;
3362
3363		if (regs->abi) {
3364			u64 mask = evsel->core.attr.sample_regs_user;
3365
3366			sz = hweight64(mask) * sizeof(u64);
3367			OVERFLOW_CHECK(array, sz, max_size);
3368			regs->mask = mask;
3369			regs->regs = (u64 *)array;
3370			array = (void *)array + sz;
3371		}
3372	}
3373
3374	if (type & PERF_SAMPLE_STACK_USER) {
3375		OVERFLOW_CHECK_u64(array);
3376		sz = *array++;
3377
3378		data->user_stack.offset = ((char *)(array - 1)
3379					  - (char *) event);
3380
3381		if (!sz) {
3382			data->user_stack.size = 0;
3383		} else {
3384			OVERFLOW_CHECK(array, sz, max_size);
3385			data->user_stack.data = (char *)array;
3386			array = (void *)array + sz;
3387			OVERFLOW_CHECK_u64(array);
3388			data->user_stack.size = *array++;
3389			if (WARN_ONCE(data->user_stack.size > sz,
3390				      "user stack dump failure\n"))
3391				return -EFAULT;
3392		}
3393	}
3394
3395	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
3396		OVERFLOW_CHECK_u64(array);
3397		perf_parse_sample_weight(data, array, type);
3398		array++;
3399	}
3400
3401	if (type & PERF_SAMPLE_DATA_SRC) {
3402		OVERFLOW_CHECK_u64(array);
3403		data->data_src = *array;
3404		array++;
3405	}
3406
3407	if (type & PERF_SAMPLE_TRANSACTION) {
3408		OVERFLOW_CHECK_u64(array);
3409		data->transaction = *array;
3410		array++;
3411	}
3412
3413	if (type & PERF_SAMPLE_REGS_INTR) {
3414		struct regs_dump *regs = perf_sample__intr_regs(data);
3415
3416		OVERFLOW_CHECK_u64(array);
3417		regs->abi = *array;
3418		array++;
3419
3420		if (regs->abi != PERF_SAMPLE_REGS_ABI_NONE) {
3421			u64 mask = evsel->core.attr.sample_regs_intr;
3422
3423			sz = hweight64(mask) * sizeof(u64);
3424			OVERFLOW_CHECK(array, sz, max_size);
3425			regs->mask = mask;
3426			regs->regs = (u64 *)array;
3427			array = (void *)array + sz;
3428		}
3429	}
3430
3431	data->phys_addr = 0;
3432	if (type & PERF_SAMPLE_PHYS_ADDR) {
3433		data->phys_addr = *array;
3434		array++;
3435	}
3436
3437	data->cgroup = 0;
3438	if (type & PERF_SAMPLE_CGROUP) {
3439		data->cgroup = *array;
3440		array++;
3441	}
3442
3443	data->data_page_size = 0;
3444	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
3445		data->data_page_size = *array;
3446		array++;
3447	}
3448
3449	data->code_page_size = 0;
3450	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
3451		data->code_page_size = *array;
3452		array++;
3453	}
3454
3455	if (type & PERF_SAMPLE_AUX) {
3456		OVERFLOW_CHECK_u64(array);
3457		sz = *array++;
3458
3459		OVERFLOW_CHECK(array, sz, max_size);
3460		/* Undo swap of data */
3461		if (swapped)
3462			mem_bswap_64((char *)array, sz);
3463		data->aux_sample.size = sz;
3464		data->aux_sample.data = (char *)array;
3465		array = (void *)array + sz;
3466	}
3467
3468	if (evsel__is_offcpu_event(evsel))
3469		return __set_offcpu_sample(data);
3470
3471	return 0;
3472}
3473
3474int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
3475				  u64 *timestamp)
3476{
3477	u64 type = evsel->core.attr.sample_type;
3478	const __u64 *array;
3479
3480	if (!(type & PERF_SAMPLE_TIME))
3481		return -1;
3482
3483	if (event->header.type != PERF_RECORD_SAMPLE) {
3484		struct perf_sample data = {
3485			.time = -1ULL,
3486		};
3487
3488		if (!evsel->core.attr.sample_id_all)
3489			return -1;
3490		if (perf_evsel__parse_id_sample(evsel, event, &data))
3491			return -1;
3492
3493		*timestamp = data.time;
3494		return 0;
3495	}
3496
3497	array = event->sample.array;
3498
3499	if (perf_event__check_size(event, evsel->sample_size))
3500		return -EFAULT;
3501
3502	if (type & PERF_SAMPLE_IDENTIFIER)
3503		array++;
3504
3505	if (type & PERF_SAMPLE_IP)
3506		array++;
3507
3508	if (type & PERF_SAMPLE_TID)
3509		array++;
3510
3511	if (type & PERF_SAMPLE_TIME)
3512		*timestamp = *array;
3513
3514	return 0;
3515}
3516
3517u16 evsel__id_hdr_size(const struct evsel *evsel)
3518{
3519	u64 sample_type = evsel->core.attr.sample_type;
3520	u16 size = 0;
3521
3522	if (sample_type & PERF_SAMPLE_TID)
3523		size += sizeof(u64);
3524
3525	if (sample_type & PERF_SAMPLE_TIME)
3526		size += sizeof(u64);
3527
3528	if (sample_type & PERF_SAMPLE_ID)
3529		size += sizeof(u64);
3530
3531	if (sample_type & PERF_SAMPLE_STREAM_ID)
3532		size += sizeof(u64);
3533
3534	if (sample_type & PERF_SAMPLE_CPU)
3535		size += sizeof(u64);
3536
3537	if (sample_type & PERF_SAMPLE_IDENTIFIER)
3538		size += sizeof(u64);
3539
3540	return size;
3541}
3542
3543#ifdef HAVE_LIBTRACEEVENT
3544struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
3545{
3546	struct tep_event *tp_format = evsel__tp_format(evsel);
3547
3548	return tp_format ? tep_find_field(tp_format, name) : NULL;
3549}
3550
3551struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name)
3552{
3553	struct tep_event *tp_format = evsel__tp_format(evsel);
3554
3555	return tp_format ? tep_find_common_field(tp_format, name) : NULL;
3556}
3557
3558void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name)
3559{
3560	struct tep_format_field *field = evsel__field(evsel, name);
3561	int offset;
3562
3563	if (!field)
3564		return NULL;
3565
3566	offset = field->offset;
3567
3568	if (field->flags & TEP_FIELD_IS_DYNAMIC) {
3569		offset = *(int *)(sample->raw_data + field->offset);
3570		offset &= 0xffff;
3571		if (tep_field_is_relative(field->flags))
3572			offset += field->offset + field->size;
3573	}
3574
3575	return sample->raw_data + offset;
3576}
3577
3578u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
3579			 bool needs_swap)
3580{
3581	u64 value;
3582	void *ptr = sample->raw_data + field->offset;
3583
3584	switch (field->size) {
3585	case 1:
3586		return *(u8 *)ptr;
3587	case 2:
3588		value = *(u16 *)ptr;
3589		break;
3590	case 4:
3591		value = *(u32 *)ptr;
3592		break;
3593	case 8:
3594		memcpy(&value, ptr, sizeof(u64));
3595		break;
3596	default:
3597		return 0;
3598	}
3599
3600	if (!needs_swap)
3601		return value;
3602
3603	switch (field->size) {
3604	case 2:
3605		return bswap_16(value);
3606	case 4:
3607		return bswap_32(value);
3608	case 8:
3609		return bswap_64(value);
3610	default:
3611		return 0;
3612	}
3613
3614	return 0;
3615}
3616
3617u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name)
3618{
3619	struct tep_format_field *field = evsel__field(evsel, name);
3620
3621	return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
3622}
3623
3624u64 evsel__intval_common(struct evsel *evsel, struct perf_sample *sample, const char *name)
3625{
3626	struct tep_format_field *field = evsel__common_field(evsel, name);
3627
3628	return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
3629}
3630
3631char evsel__taskstate(struct evsel *evsel, struct perf_sample *sample, const char *name)
3632{
3633	static struct tep_format_field *prev_state_field;
3634	static const char *states;
3635	struct tep_format_field *field;
3636	unsigned long long val;
3637	unsigned int bit;
3638	char state = '?'; /* '?' denotes unknown task state */
3639
3640	field = evsel__field(evsel, name);
3641
3642	if (!field)
3643		return state;
3644
3645	if (!states || field != prev_state_field) {
3646		states = parse_task_states(field);
3647		if (!states)
3648			return state;
3649		prev_state_field = field;
3650	}
3651
3652	/*
3653	 * Note since the kernel exposes TASK_REPORT_MAX to userspace
3654	 * to denote the 'preempted' state, we might as welll report
3655	 * 'R' for this case, which make senses to users as well.
3656	 *
3657	 * We can change this if we have a good reason in the future.
3658	 */
3659	val = evsel__intval(evsel, sample, name);
3660	bit = val ? ffs(val) : 0;
3661	state = (!bit || bit > strlen(states)) ? 'R' : states[bit-1];
3662	return state;
3663}
3664#endif
3665
3666bool evsel__fallback(struct evsel *evsel, struct target *target, int err,
3667		     char *msg, size_t msgsize)
3668{
3669	int paranoid;
3670
3671	if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
3672	    evsel->core.attr.type   == PERF_TYPE_HARDWARE &&
3673	    evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
3674		/*
3675		 * If it's cycles then fall back to hrtimer based cpu-clock sw
3676		 * counter, which is always available even if no PMU support.
3677		 *
3678		 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
3679		 * b0a873e).
3680		 */
3681		evsel->core.attr.type   = PERF_TYPE_SOFTWARE;
3682		evsel->core.attr.config = target__has_cpu(target)
3683			? PERF_COUNT_SW_CPU_CLOCK
3684			: PERF_COUNT_SW_TASK_CLOCK;
3685		scnprintf(msg, msgsize,
3686			"The cycles event is not supported, trying to fall back to %s",
3687			target__has_cpu(target) ? "cpu-clock" : "task-clock");
3688
3689		zfree(&evsel->name);
3690		return true;
3691	} else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
3692		   (paranoid = perf_event_paranoid()) > 1) {
3693		const char *name = evsel__name(evsel);
3694		char *new_name;
3695		const char *sep = ":";
3696
3697		/* If event has exclude user then don't exclude kernel. */
3698		if (evsel->core.attr.exclude_user)
3699			goto no_fallback;
3700
3701		/* Is there already the separator in the name. */
3702		if (strchr(name, '/') ||
3703		    (strchr(name, ':') && !evsel->is_libpfm_event))
3704			sep = "";
3705
3706		if (asprintf(&new_name, "%s%su", name, sep) < 0)
3707			goto no_fallback;
3708
3709		free(evsel->name);
3710		evsel->name = new_name;
3711		scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
3712			  "to fall back to excluding kernel and hypervisor "
3713			  " samples", paranoid);
3714		evsel->core.attr.exclude_kernel = 1;
3715		evsel->core.attr.exclude_hv     = 1;
3716
3717		return true;
3718	} else if (err == EOPNOTSUPP && !evsel->core.attr.exclude_guest &&
3719		   !evsel->exclude_GH) {
3720		const char *name = evsel__name(evsel);
3721		char *new_name;
3722		const char *sep = ":";
3723
3724		/* Is there already the separator in the name. */
3725		if (strchr(name, '/') ||
3726		    (strchr(name, ':') && !evsel->is_libpfm_event))
3727			sep = "";
3728
3729		if (asprintf(&new_name, "%s%sH", name, sep) < 0)
3730			goto no_fallback;
3731
3732		free(evsel->name);
3733		evsel->name = new_name;
3734		/* Apple M1 requires exclude_guest */
3735		scnprintf(msg, msgsize, "Trying to fall back to excluding guest samples");
3736		evsel->core.attr.exclude_guest = 1;
3737
3738		return true;
3739	}
3740no_fallback:
3741	scnprintf(msg, msgsize, "No fallback found for '%s' for error %d",
3742		  evsel__name(evsel), err);
3743	return false;
3744}
3745
3746static bool find_process(const char *name)
3747{
3748	size_t len = strlen(name);
3749	DIR *dir;
3750	struct dirent *d;
3751	int ret = -1;
3752
3753	dir = opendir(procfs__mountpoint());
3754	if (!dir)
3755		return false;
3756
3757	/* Walk through the directory. */
3758	while (ret && (d = readdir(dir)) != NULL) {
3759		char path[PATH_MAX];
3760		char *data;
3761		size_t size;
3762
3763		if ((d->d_type != DT_DIR) ||
3764		     !strcmp(".", d->d_name) ||
3765		     !strcmp("..", d->d_name))
3766			continue;
3767
3768		scnprintf(path, sizeof(path), "%s/%s/comm",
3769			  procfs__mountpoint(), d->d_name);
3770
3771		if (filename__read_str(path, &data, &size))
3772			continue;
3773
3774		ret = strncmp(name, data, len);
3775		free(data);
3776	}
3777
3778	closedir(dir);
3779	return ret ? false : true;
3780}
3781
3782static int dump_perf_event_processes(char *msg, size_t size)
3783{
3784	DIR *proc_dir;
3785	struct dirent *proc_entry;
3786	int printed = 0;
3787
3788	proc_dir = opendir(procfs__mountpoint());
3789	if (!proc_dir)
3790		return 0;
3791
3792	/* Walk through the /proc directory. */
3793	while ((proc_entry = readdir(proc_dir)) != NULL) {
3794		char buf[256];
3795		DIR *fd_dir;
3796		struct dirent *fd_entry;
3797		int fd_dir_fd;
3798
3799		if (proc_entry->d_type != DT_DIR ||
3800		    !isdigit(proc_entry->d_name[0]) ||
3801		    strlen(proc_entry->d_name) > sizeof(buf) - 4)
3802			continue;
3803
3804		scnprintf(buf, sizeof(buf), "%s/fd", proc_entry->d_name);
3805		fd_dir_fd = openat(dirfd(proc_dir), buf, O_DIRECTORY);
3806		if (fd_dir_fd == -1)
3807			continue;
3808		fd_dir = fdopendir(fd_dir_fd);
3809		if (!fd_dir) {
3810			close(fd_dir_fd);
3811			continue;
3812		}
3813		while ((fd_entry = readdir(fd_dir)) != NULL) {
3814			ssize_t link_size;
3815
3816			if (fd_entry->d_type != DT_LNK)
3817				continue;
3818			link_size = readlinkat(fd_dir_fd, fd_entry->d_name, buf, sizeof(buf));
3819			if (link_size < 0)
3820				continue;
3821			/* Take care as readlink doesn't null terminate the string. */
3822			if (!strncmp(buf, "anon_inode:[perf_event]", link_size)) {
3823				int cmdline_fd;
3824				ssize_t cmdline_size;
3825
3826				scnprintf(buf, sizeof(buf), "%s/cmdline", proc_entry->d_name);
3827				cmdline_fd = openat(dirfd(proc_dir), buf, O_RDONLY);
3828				if (cmdline_fd == -1)
3829					continue;
3830				cmdline_size = read(cmdline_fd, buf, sizeof(buf) - 1);
3831				close(cmdline_fd);
3832				if (cmdline_size < 0)
3833					continue;
3834				buf[cmdline_size] = '\0';
3835				for (ssize_t i = 0; i < cmdline_size; i++) {
3836					if (buf[i] == '\0')
3837						buf[i] = ' ';
3838				}
3839
3840				if (printed == 0)
3841					printed += scnprintf(msg, size, "Possible processes:\n");
3842
3843				printed += scnprintf(msg + printed, size - printed,
3844						"%s %s\n", proc_entry->d_name, buf);
3845				break;
3846			}
3847		}
3848		closedir(fd_dir);
3849	}
3850	closedir(proc_dir);
3851	return printed;
3852}
3853
3854int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused,
3855				     int err __maybe_unused,
3856				     char *msg __maybe_unused,
3857				     size_t size __maybe_unused)
3858{
3859	return 0;
3860}
3861
3862int evsel__open_strerror(struct evsel *evsel, struct target *target,
3863			 int err, char *msg, size_t size)
3864{
3865	struct perf_pmu *pmu;
3866	char sbuf[STRERR_BUFSIZE];
3867	int printed = 0, enforced = 0;
3868	int ret;
3869
3870	switch (err) {
3871	case EPERM:
3872	case EACCES:
3873		printed += scnprintf(msg + printed, size - printed,
3874			"Access to performance monitoring and observability operations is limited.\n");
3875
3876		if (!sysfs__read_int("fs/selinux/enforce", &enforced)) {
3877			if (enforced) {
3878				printed += scnprintf(msg + printed, size - printed,
3879					"Enforced MAC policy settings (SELinux) can limit access to performance\n"
3880					"monitoring and observability operations. Inspect system audit records for\n"
3881					"more perf_event access control information and adjusting the policy.\n");
3882			}
3883		}
3884
3885		if (err == EPERM)
3886			printed += scnprintf(msg, size,
3887				"No permission to enable %s event.\n\n", evsel__name(evsel));
3888
3889		return printed + scnprintf(msg + printed, size - printed,
3890		 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
3891		 "access to performance monitoring and observability operations for processes\n"
3892		 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
3893		 "More information can be found at 'Perf events and tool security' document:\n"
3894		 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
3895		 "perf_event_paranoid setting is %d:\n"
3896		 "  -1: Allow use of (almost) all events by all users\n"
3897		 "      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
3898		 ">= 0: Disallow raw and ftrace function tracepoint access\n"
3899		 ">= 1: Disallow CPU event access\n"
3900		 ">= 2: Disallow kernel profiling\n"
3901		 "To make the adjusted perf_event_paranoid setting permanent preserve it\n"
3902		 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)",
3903		 perf_event_paranoid());
3904	case ENOENT:
3905		return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
3906	case EMFILE:
3907		return scnprintf(msg, size, "%s",
3908			 "Too many events are opened.\n"
3909			 "Probably the maximum number of open file descriptors has been reached.\n"
3910			 "Hint: Try again after reducing the number of events.\n"
3911			 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
3912	case ENOMEM:
3913		if (evsel__has_callchain(evsel) &&
3914		    access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
3915			return scnprintf(msg, size,
3916					 "Not enough memory to setup event with callchain.\n"
3917					 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
3918					 "Hint: Current value: %d", sysctl__max_stack());
3919		break;
3920	case ENODEV:
3921		if (target->cpu_list)
3922			return scnprintf(msg, size, "%s",
3923	 "No such device - did you specify an out-of-range profile CPU?");
3924		break;
3925	case EOPNOTSUPP:
3926		if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK)
3927			return scnprintf(msg, size,
3928	"%s: PMU Hardware or event type doesn't support branch stack sampling.",
3929					 evsel__name(evsel));
3930		if (evsel->core.attr.aux_output)
3931			return scnprintf(msg, size,
3932	"%s: PMU Hardware doesn't support 'aux_output' feature",
3933					 evsel__name(evsel));
3934		if (evsel->core.attr.aux_action)
3935			return scnprintf(msg, size,
3936	"%s: PMU Hardware doesn't support 'aux_action' feature",
3937					evsel__name(evsel));
3938		if (evsel->core.attr.sample_period != 0)
3939			return scnprintf(msg, size,
3940	"%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
3941					 evsel__name(evsel));
3942		if (evsel->core.attr.precise_ip)
3943			return scnprintf(msg, size, "%s",
3944	"\'precise\' request may not be supported. Try removing 'p' modifier.");
3945#if defined(__i386__) || defined(__x86_64__)
3946		if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
3947			return scnprintf(msg, size, "%s",
3948	"No hardware sampling interrupt available.\n");
3949#endif
3950		if (!target__has_cpu(target))
3951			return scnprintf(msg, size,
3952	"Unsupported event (%s) in per-thread mode, enable system wide with '-a'.",
3953					evsel__name(evsel));
3954		break;
3955	case EBUSY:
3956		if (find_process("oprofiled"))
3957			return scnprintf(msg, size,
3958	"The PMU counters are busy/taken by another profiler.\n"
3959	"We found oprofile daemon running, please stop it and try again.");
3960		printed += scnprintf(
3961			msg, size,
3962			"The PMU %s counters are busy and in use by another process.\n",
3963			evsel->pmu ? evsel->pmu->name : "");
3964		return printed + dump_perf_event_processes(msg + printed, size - printed);
3965		break;
3966	case EINVAL:
3967		if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
3968			return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
3969		if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
3970			return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
3971		if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
3972			return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
3973		if (perf_missing_features.clockid)
3974			return scnprintf(msg, size, "clockid feature not supported.");
3975		if (perf_missing_features.clockid_wrong)
3976			return scnprintf(msg, size, "wrong clockid (%d).", clockid);
3977		if (perf_missing_features.aux_action)
3978			return scnprintf(msg, size, "The 'aux_action' feature is not supported, update the kernel.");
3979		if (perf_missing_features.aux_output)
3980			return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
3981		pmu = evsel__find_pmu(evsel);
3982		if (!pmu->is_core && !target__has_cpu(target))
3983			return scnprintf(msg, size,
3984	"Invalid event (%s) in per-thread mode, enable system wide with '-a'.",
3985					evsel__name(evsel));
3986
3987		break;
3988	case ENODATA:
3989		return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
3990				 "Please add an auxiliary event in front of the load latency event.");
3991	default:
3992		break;
3993	}
3994
3995	ret = arch_evsel__open_strerror(evsel, err, msg, size);
3996	if (ret)
3997		return ret;
3998
3999	return scnprintf(msg, size,
4000	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
4001	"\"dmesg | grep -i perf\" may provide additional information.\n",
4002			 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
4003}
4004
4005struct perf_session *evsel__session(struct evsel *evsel)
4006{
4007	return evsel && evsel->evlist ? evsel->evlist->session : NULL;
4008}
4009
4010struct perf_env *evsel__env(struct evsel *evsel)
4011{
4012	struct perf_session *session = evsel__session(evsel);
4013
4014	return session ? perf_session__env(session) : NULL;
4015}
4016
4017static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
4018{
4019	int cpu_map_idx, thread;
4020
4021	if (evsel__is_retire_lat(evsel))
4022		return 0;
4023
4024	if (perf_pmu__kind(evsel->pmu) != PERF_PMU_KIND_PE)
4025		return 0;
4026
4027	for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) {
4028		for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
4029		     thread++) {
4030			int fd = FD(evsel, cpu_map_idx, thread);
4031
4032			if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
4033						   cpu_map_idx, thread, fd) < 0)
4034				return -1;
4035		}
4036	}
4037
4038	return 0;
4039}
4040
4041int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
4042{
4043	struct perf_cpu_map *cpus = evsel->core.cpus;
4044	struct perf_thread_map *threads = evsel->core.threads;
4045
4046	if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr))
4047		return -ENOMEM;
4048
4049	return store_evsel_ids(evsel, evlist);
4050}
4051
4052void evsel__zero_per_pkg(struct evsel *evsel)
4053{
4054	struct hashmap_entry *cur;
4055	size_t bkt;
4056
4057	if (evsel->per_pkg_mask) {
4058		hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt)
4059			zfree(&cur->pkey);
4060
4061		hashmap__clear(evsel->per_pkg_mask);
4062	}
4063}
4064
4065/**
4066 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this
4067 *                    will be false on hybrid systems for hardware and legacy
4068 *                    cache events.
4069 */
4070bool evsel__is_hybrid(const struct evsel *evsel)
4071{
4072	if (!evsel->core.is_pmu_core)
4073		return false;
4074
4075	return perf_pmus__num_core_pmus() > 1;
4076}
4077
4078struct evsel *evsel__leader(const struct evsel *evsel)
4079{
4080	if (evsel->core.leader == NULL)
4081		return NULL;
4082	return container_of(evsel->core.leader, struct evsel, core);
4083}
4084
4085bool evsel__has_leader(struct evsel *evsel, struct evsel *leader)
4086{
4087	return evsel->core.leader == &leader->core;
4088}
4089
4090bool evsel__is_leader(struct evsel *evsel)
4091{
4092	return evsel__has_leader(evsel, evsel);
4093}
4094
4095void evsel__set_leader(struct evsel *evsel, struct evsel *leader)
4096{
4097	evsel->core.leader = &leader->core;
4098}
4099
4100int evsel__source_count(const struct evsel *evsel)
4101{
4102	struct evsel *pos;
4103	int count = 0;
4104
4105	evlist__for_each_entry(evsel->evlist, pos) {
4106		if (pos->metric_leader == evsel)
4107			count++;
4108	}
4109	return count;
4110}
4111
4112bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused)
4113{
4114	return false;
4115}
4116
4117/*
4118 * Remove an event from a given group (leader).
4119 * Some events, e.g., perf metrics Topdown events,
4120 * must always be grouped. Ignore the events.
4121 */
4122void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader)
4123{
4124	if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) {
4125		evsel__set_leader(evsel, evsel);
4126		evsel->core.nr_members = 0;
4127		leader->core.nr_members--;
4128	}
4129}
4130
4131bool evsel__set_needs_uniquify(struct evsel *counter, const struct perf_stat_config *config)
4132{
4133	struct evsel *evsel;
4134
4135	if (counter->needs_uniquify) {
4136		/* Already set. */
4137		return true;
4138	}
4139
4140	if (counter->use_config_name || counter->is_libpfm_event) {
4141		/* Original name will be used. */
4142		return false;
4143	}
4144
4145	if (!config->hybrid_merge && evsel__is_hybrid(counter)) {
4146		/* Unique hybrid counters necessary. */
4147		counter->needs_uniquify = true;
4148		return true;
4149	}
4150
4151	if  (counter->core.attr.type < PERF_TYPE_MAX && counter->core.attr.type != PERF_TYPE_RAW) {
4152		/* Legacy event, don't uniquify. */
4153		return false;
4154	}
4155
4156	if (counter->pmu && counter->pmu->is_core &&
4157	    counter->alternate_hw_config != PERF_COUNT_HW_MAX) {
4158		/* A sysfs or json event replacing a legacy event, don't uniquify. */
4159		return false;
4160	}
4161
4162	if (config->aggr_mode == AGGR_NONE) {
4163		/* Always unique with no aggregation. */
4164		counter->needs_uniquify = true;
4165		return true;
4166	}
4167
4168	if (counter->first_wildcard_match != NULL) {
4169		/*
4170		 * If stats are merged then only the first_wildcard_match is
4171		 * displayed, there is no need to uniquify this evsel as the
4172		 * name won't be shown.
4173		 */
4174		return false;
4175	}
4176
4177	/*
4178	 * Do other non-merged events in the evlist have the same name? If so
4179	 * uniquify is necessary.
4180	 */
4181	evlist__for_each_entry(counter->evlist, evsel) {
4182		if (evsel == counter || evsel->first_wildcard_match || evsel->pmu == counter->pmu)
4183			continue;
4184
4185		if (evsel__name_is(counter, evsel__name(evsel))) {
4186			counter->needs_uniquify = true;
4187			return true;
4188		}
4189	}
4190	return false;
4191}
4192
4193void evsel__uniquify_counter(struct evsel *counter)
4194{
4195	const char *name, *pmu_name, *config;
4196	char *new_name;
4197	int len, ret;
4198
4199	/* No uniquification necessary. */
4200	if (!counter->needs_uniquify)
4201		return;
4202
4203	/* The evsel was already uniquified. */
4204	if (counter->uniquified_name)
4205		return;
4206
4207	/* Avoid checking to uniquify twice. */
4208	counter->uniquified_name = true;
4209
4210	name = evsel__name(counter);
4211	config = strchr(name, '/');
4212	pmu_name = counter->pmu->name;
4213
4214	/* Already prefixed by the PMU name? */
4215	len = pmu_name_len_no_suffix(pmu_name);
4216
4217	if (!strncmp(name, pmu_name, len)) {
4218		/*
4219		 * If the PMU name is there, then there is no sense in not
4220		 * having a slash. Do this for robustness.
4221		 */
4222		if (config == NULL)
4223			config = name - 1;
4224
4225		ret = asprintf(&new_name, "%s/%s", pmu_name, config + 1);
4226	} else if (config) {
4227		len = config - name;
4228		if (config[1] == '/') {
4229			/* case: event// */
4230			ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 2);
4231		} else {
4232			/* case: event/.../ */
4233			ret = asprintf(&new_name, "%s/%.*s,%s", pmu_name, len, name, config + 1);
4234		}
4235	} else {
4236		config = strchr(name, ':');
4237		if (config) {
4238			/* case: event:.. */
4239			len = config - name;
4240
4241			ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 1);
4242		} else {
4243			/* case: event */
4244			ret = asprintf(&new_name, "%s/%s/", pmu_name, name);
4245		}
4246	}
4247	if (ret > 0) {
4248		free(counter->name);
4249		counter->name = new_name;
4250	} else {
4251		/* ENOMEM from asprintf. */
4252		counter->uniquified_name = false;
4253	}
4254}
4255
4256void evsel__warn_user_requested_cpus(struct evsel *evsel, struct perf_cpu_map *user_requested_cpus)
4257{
4258	struct perf_cpu_map *intersect, *online = NULL;
4259	const struct perf_pmu *pmu = evsel__find_pmu(evsel);
4260
4261	if (pmu && pmu->is_core) {
4262		intersect = perf_cpu_map__intersect(pmu->cpus, user_requested_cpus);
4263	} else {
4264		online = cpu_map__online();
4265		intersect = perf_cpu_map__intersect(online, user_requested_cpus);
4266	}
4267	if (!perf_cpu_map__equal(intersect, user_requested_cpus)) {
4268		char buf1[128];
4269		char buf2[128];
4270
4271		cpu_map__snprint(user_requested_cpus, buf1, sizeof(buf1));
4272		cpu_map__snprint(online ?: pmu->cpus, buf2, sizeof(buf2));
4273		pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n",
4274			   buf1, pmu ? pmu->name : "cpu", buf2, evsel__name(evsel));
4275	}
4276	perf_cpu_map__put(intersect);
4277	perf_cpu_map__put(online);
4278}