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#include <byteswap.h>
  10#include <errno.h>
  11#include <inttypes.h>
  12#include <linux/bitops.h>
  13#include <api/fs/fs.h>
  14#include <api/fs/tracing_path.h>
  15#include <traceevent/event-parse.h>
  16#include <linux/hw_breakpoint.h>
  17#include <linux/perf_event.h>
  18#include <linux/compiler.h>
  19#include <linux/err.h>
  20#include <linux/zalloc.h>
  21#include <sys/ioctl.h>
  22#include <sys/resource.h>
  23#include <sys/types.h>
  24#include <dirent.h>
  25#include <stdlib.h>
  26#include <perf/evsel.h>
  27#include "asm/bug.h"
 
  28#include "callchain.h"
  29#include "cgroup.h"
  30#include "counts.h"
  31#include "event.h"
  32#include "evsel.h"
  33#include "util/env.h"
  34#include "util/evsel_config.h"
  35#include "util/evsel_fprintf.h"
  36#include "evlist.h"
  37#include <perf/cpumap.h>
  38#include "thread_map.h"
  39#include "target.h"
  40#include "perf_regs.h"
  41#include "record.h"
  42#include "debug.h"
  43#include "trace-event.h"
  44#include "stat.h"
  45#include "string2.h"
  46#include "memswap.h"
  47#include "util.h"
 
 
 
 
 
  48#include "../perf-sys.h"
  49#include "util/parse-branch-options.h"
 
  50#include <internal/xyarray.h>
  51#include <internal/lib.h>
 
  52
  53#include <linux/ctype.h>
  54
 
 
 
 
  55struct perf_missing_features perf_missing_features;
  56
  57static clockid_t clockid;
  58
  59static int perf_evsel__no_extra_init(struct evsel *evsel __maybe_unused)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  60{
  61	return 0;
  62}
  63
  64void __weak test_attr__ready(void) { }
  65
  66static void perf_evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
  67{
  68}
  69
  70static struct {
  71	size_t	size;
  72	int	(*init)(struct evsel *evsel);
  73	void	(*fini)(struct evsel *evsel);
  74} perf_evsel__object = {
  75	.size = sizeof(struct evsel),
  76	.init = perf_evsel__no_extra_init,
  77	.fini = perf_evsel__no_extra_fini,
  78};
  79
  80int perf_evsel__object_config(size_t object_size,
  81			      int (*init)(struct evsel *evsel),
  82			      void (*fini)(struct evsel *evsel))
  83{
  84
  85	if (object_size == 0)
  86		goto set_methods;
  87
  88	if (perf_evsel__object.size > object_size)
  89		return -EINVAL;
  90
  91	perf_evsel__object.size = object_size;
  92
  93set_methods:
  94	if (init != NULL)
  95		perf_evsel__object.init = init;
  96
  97	if (fini != NULL)
  98		perf_evsel__object.fini = fini;
  99
 100	return 0;
 101}
 102
 103#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
 104
 105int __perf_evsel__sample_size(u64 sample_type)
 106{
 107	u64 mask = sample_type & PERF_SAMPLE_MASK;
 108	int size = 0;
 109	int i;
 110
 111	for (i = 0; i < 64; i++) {
 112		if (mask & (1ULL << i))
 113			size++;
 114	}
 115
 116	size *= sizeof(u64);
 117
 118	return size;
 119}
 120
 121/**
 122 * __perf_evsel__calc_id_pos - calculate id_pos.
 123 * @sample_type: sample type
 124 *
 125 * This function returns the position of the event id (PERF_SAMPLE_ID or
 126 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
 127 * perf_record_sample.
 128 */
 129static int __perf_evsel__calc_id_pos(u64 sample_type)
 130{
 131	int idx = 0;
 132
 133	if (sample_type & PERF_SAMPLE_IDENTIFIER)
 134		return 0;
 135
 136	if (!(sample_type & PERF_SAMPLE_ID))
 137		return -1;
 138
 139	if (sample_type & PERF_SAMPLE_IP)
 140		idx += 1;
 141
 142	if (sample_type & PERF_SAMPLE_TID)
 143		idx += 1;
 144
 145	if (sample_type & PERF_SAMPLE_TIME)
 146		idx += 1;
 147
 148	if (sample_type & PERF_SAMPLE_ADDR)
 149		idx += 1;
 150
 151	return idx;
 152}
 153
 154/**
 155 * __perf_evsel__calc_is_pos - calculate is_pos.
 156 * @sample_type: sample type
 157 *
 158 * This function returns the position (counting backwards) of the event id
 159 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
 160 * sample_id_all is used there is an id sample appended to non-sample events.
 161 */
 162static int __perf_evsel__calc_is_pos(u64 sample_type)
 163{
 164	int idx = 1;
 165
 166	if (sample_type & PERF_SAMPLE_IDENTIFIER)
 167		return 1;
 168
 169	if (!(sample_type & PERF_SAMPLE_ID))
 170		return -1;
 171
 172	if (sample_type & PERF_SAMPLE_CPU)
 173		idx += 1;
 174
 175	if (sample_type & PERF_SAMPLE_STREAM_ID)
 176		idx += 1;
 177
 178	return idx;
 179}
 180
 181void perf_evsel__calc_id_pos(struct evsel *evsel)
 182{
 183	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
 184	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
 185}
 186
 187void __perf_evsel__set_sample_bit(struct evsel *evsel,
 188				  enum perf_event_sample_format bit)
 189{
 190	if (!(evsel->core.attr.sample_type & bit)) {
 191		evsel->core.attr.sample_type |= bit;
 192		evsel->sample_size += sizeof(u64);
 193		perf_evsel__calc_id_pos(evsel);
 194	}
 195}
 196
 197void __perf_evsel__reset_sample_bit(struct evsel *evsel,
 198				    enum perf_event_sample_format bit)
 199{
 200	if (evsel->core.attr.sample_type & bit) {
 201		evsel->core.attr.sample_type &= ~bit;
 202		evsel->sample_size -= sizeof(u64);
 203		perf_evsel__calc_id_pos(evsel);
 204	}
 205}
 206
 207void perf_evsel__set_sample_id(struct evsel *evsel,
 208			       bool can_sample_identifier)
 209{
 210	if (can_sample_identifier) {
 211		perf_evsel__reset_sample_bit(evsel, ID);
 212		perf_evsel__set_sample_bit(evsel, IDENTIFIER);
 213	} else {
 214		perf_evsel__set_sample_bit(evsel, ID);
 215	}
 216	evsel->core.attr.read_format |= PERF_FORMAT_ID;
 217}
 218
 219/**
 220 * perf_evsel__is_function_event - Return whether given evsel is a function
 221 * trace event
 222 *
 223 * @evsel - evsel selector to be tested
 224 *
 225 * Return %true if event is function trace event
 226 */
 227bool perf_evsel__is_function_event(struct evsel *evsel)
 228{
 229#define FUNCTION_EVENT "ftrace:function"
 230
 231	return evsel->name &&
 232	       !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
 233
 234#undef FUNCTION_EVENT
 235}
 236
 237void evsel__init(struct evsel *evsel,
 238		 struct perf_event_attr *attr, int idx)
 239{
 240	perf_evsel__init(&evsel->core, attr);
 241	evsel->idx	   = idx;
 242	evsel->tracking	   = !idx;
 243	evsel->leader	   = evsel;
 244	evsel->unit	   = "";
 245	evsel->scale	   = 1.0;
 246	evsel->max_events  = ULONG_MAX;
 247	evsel->evlist	   = NULL;
 248	evsel->bpf_obj	   = NULL;
 249	evsel->bpf_fd	   = -1;
 250	INIT_LIST_HEAD(&evsel->config_terms);
 
 
 251	perf_evsel__object.init(evsel);
 252	evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
 253	perf_evsel__calc_id_pos(evsel);
 254	evsel->cmdline_group_boundary = false;
 255	evsel->metric_expr   = NULL;
 256	evsel->metric_name   = NULL;
 257	evsel->metric_events = NULL;
 
 258	evsel->collect_stat  = false;
 259	evsel->pmu_name      = NULL;
 
 
 260}
 261
 262struct evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
 263{
 264	struct evsel *evsel = zalloc(perf_evsel__object.size);
 265
 266	if (!evsel)
 267		return NULL;
 268	evsel__init(evsel, attr, idx);
 269
 270	if (perf_evsel__is_bpf_output(evsel)) {
 271		evsel->core.attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 272					    PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 273		evsel->core.attr.sample_period = 1;
 274	}
 275
 276	if (perf_evsel__is_clock(evsel)) {
 277		/*
 278		 * The evsel->unit points to static alias->unit
 279		 * so it's ok to use static string in here.
 280		 */
 281		static const char *unit = "msec";
 282
 283		evsel->unit = unit;
 284		evsel->scale = 1e-6;
 285	}
 286
 287	return evsel;
 288}
 289
 290static bool perf_event_can_profile_kernel(void)
 291{
 292	return perf_event_paranoid_check(1);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 293}
 294
 295struct evsel *perf_evsel__new_cycles(bool precise)
 
 
 
 
 
 
 
 
 
 
 
 
 296{
 297	struct perf_event_attr attr = {
 298		.type	= PERF_TYPE_HARDWARE,
 299		.config	= PERF_COUNT_HW_CPU_CYCLES,
 300		.exclude_kernel	= !perf_event_can_profile_kernel(),
 301	};
 302	struct evsel *evsel;
 303
 304	event_attr_init(&attr);
 
 
 
 305
 306	if (!precise)
 307		goto new_event;
 
 308
 309	/*
 310	 * Now let the usual logic to set up the perf_event_attr defaults
 311	 * to kick in when we return and before perf_evsel__open() is called.
 312	 */
 313new_event:
 314	evsel = evsel__new(&attr);
 315	if (evsel == NULL)
 316		goto out;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 317
 318	evsel->precise_max = true;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 319
 320	/* use asprintf() because free(evsel) assumes name is allocated */
 321	if (asprintf(&evsel->name, "cycles%s%s%.*s",
 322		     (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
 323		     attr.exclude_kernel ? "u" : "",
 324		     attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
 325		goto error_free;
 326out:
 327	return evsel;
 328error_free:
 
 329	evsel__delete(evsel);
 330	evsel = NULL;
 331	goto out;
 332}
 333
 334/*
 335 * Returns pointer with encoded error via <linux/err.h> interface.
 336 */
 337struct evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
 
 338{
 339	struct evsel *evsel = zalloc(perf_evsel__object.size);
 340	int err = -ENOMEM;
 341
 342	if (evsel == NULL) {
 343		goto out_err;
 344	} else {
 345		struct perf_event_attr attr = {
 346			.type	       = PERF_TYPE_TRACEPOINT,
 347			.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
 348					  PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 349		};
 350
 351		if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
 352			goto out_free;
 353
 354		evsel->tp_format = trace_event__tp_format(sys, name);
 355		if (IS_ERR(evsel->tp_format)) {
 356			err = PTR_ERR(evsel->tp_format);
 357			goto out_free;
 358		}
 359
 360		event_attr_init(&attr);
 361		attr.config = evsel->tp_format->id;
 362		attr.sample_period = 1;
 363		evsel__init(evsel, &attr, idx);
 364	}
 365
 366	return evsel;
 367
 368out_free:
 369	zfree(&evsel->name);
 370	free(evsel);
 371out_err:
 372	return ERR_PTR(err);
 373}
 
 374
 375const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
 376	"cycles",
 377	"instructions",
 378	"cache-references",
 379	"cache-misses",
 380	"branches",
 381	"branch-misses",
 382	"bus-cycles",
 383	"stalled-cycles-frontend",
 384	"stalled-cycles-backend",
 385	"ref-cycles",
 386};
 387
 388static const char *__perf_evsel__hw_name(u64 config)
 
 
 389{
 390	if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
 391		return perf_evsel__hw_names[config];
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 392
 393	return "unknown-hardware";
 394}
 395
 396static int perf_evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
 397{
 398	int colon = 0, r = 0;
 399	struct perf_event_attr *attr = &evsel->core.attr;
 400	bool exclude_guest_default = false;
 401
 402#define MOD_PRINT(context, mod)	do {					\
 403		if (!attr->exclude_##context) {				\
 404			if (!colon) colon = ++r;			\
 405			r += scnprintf(bf + r, size - r, "%c", mod);	\
 406		} } while(0)
 407
 408	if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
 409		MOD_PRINT(kernel, 'k');
 410		MOD_PRINT(user, 'u');
 411		MOD_PRINT(hv, 'h');
 412		exclude_guest_default = true;
 413	}
 414
 415	if (attr->precise_ip) {
 416		if (!colon)
 417			colon = ++r;
 418		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
 419		exclude_guest_default = true;
 420	}
 421
 422	if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
 423		MOD_PRINT(host, 'H');
 424		MOD_PRINT(guest, 'G');
 425	}
 426#undef MOD_PRINT
 427	if (colon)
 428		bf[colon - 1] = ':';
 429	return r;
 430}
 431
 432static int perf_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
 
 
 
 
 
 433{
 434	int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->core.attr.config));
 435	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 436}
 437
 438const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
 439	"cpu-clock",
 440	"task-clock",
 441	"page-faults",
 442	"context-switches",
 443	"cpu-migrations",
 444	"minor-faults",
 445	"major-faults",
 446	"alignment-faults",
 447	"emulation-faults",
 448	"dummy",
 449};
 450
 451static const char *__perf_evsel__sw_name(u64 config)
 452{
 453	if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
 454		return perf_evsel__sw_names[config];
 455	return "unknown-software";
 456}
 457
 458static int perf_evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
 459{
 460	int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->core.attr.config));
 461	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 462}
 463
 464static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
 
 
 
 
 
 465{
 466	int r;
 467
 468	r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
 469
 470	if (type & HW_BREAKPOINT_R)
 471		r += scnprintf(bf + r, size - r, "r");
 472
 473	if (type & HW_BREAKPOINT_W)
 474		r += scnprintf(bf + r, size - r, "w");
 475
 476	if (type & HW_BREAKPOINT_X)
 477		r += scnprintf(bf + r, size - r, "x");
 478
 479	return r;
 480}
 481
 482static int perf_evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
 483{
 484	struct perf_event_attr *attr = &evsel->core.attr;
 485	int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
 486	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 487}
 488
 489const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
 490				[PERF_EVSEL__MAX_ALIASES] = {
 491 { "L1-dcache",	"l1-d",		"l1d",		"L1-data",		},
 492 { "L1-icache",	"l1-i",		"l1i",		"L1-instruction",	},
 493 { "LLC",	"L2",							},
 494 { "dTLB",	"d-tlb",	"Data-TLB",				},
 495 { "iTLB",	"i-tlb",	"Instruction-TLB",			},
 496 { "branch",	"branches",	"bpu",		"btb",		"bpc",	},
 497 { "node",								},
 498};
 499
 500const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
 501				   [PERF_EVSEL__MAX_ALIASES] = {
 502 { "load",	"loads",	"read",					},
 503 { "store",	"stores",	"write",				},
 504 { "prefetch",	"prefetches",	"speculative-read", "speculative-load",	},
 505};
 506
 507const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
 508				       [PERF_EVSEL__MAX_ALIASES] = {
 509 { "refs",	"Reference",	"ops",		"access",		},
 510 { "misses",	"miss",							},
 511};
 512
 513#define C(x)		PERF_COUNT_HW_CACHE_##x
 514#define CACHE_READ	(1 << C(OP_READ))
 515#define CACHE_WRITE	(1 << C(OP_WRITE))
 516#define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
 517#define COP(x)		(1 << x)
 518
 519/*
 520 * cache operartion stat
 521 * L1I : Read and prefetch only
 522 * ITLB and BPU : Read-only
 523 */
 524static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
 525 [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 526 [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
 527 [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 528 [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 529 [C(ITLB)]	= (CACHE_READ),
 530 [C(BPU)]	= (CACHE_READ),
 531 [C(NODE)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 532};
 533
 534bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
 535{
 536	if (perf_evsel__hw_cache_stat[type] & COP(op))
 537		return true;	/* valid */
 538	else
 539		return false;	/* invalid */
 540}
 541
 542int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
 543					    char *bf, size_t size)
 544{
 545	if (result) {
 546		return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
 547				 perf_evsel__hw_cache_op[op][0],
 548				 perf_evsel__hw_cache_result[result][0]);
 549	}
 550
 551	return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
 552			 perf_evsel__hw_cache_op[op][1]);
 553}
 554
 555static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
 556{
 557	u8 op, result, type = (config >>  0) & 0xff;
 558	const char *err = "unknown-ext-hardware-cache-type";
 559
 560	if (type >= PERF_COUNT_HW_CACHE_MAX)
 561		goto out_err;
 562
 563	op = (config >>  8) & 0xff;
 564	err = "unknown-ext-hardware-cache-op";
 565	if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
 566		goto out_err;
 567
 568	result = (config >> 16) & 0xff;
 569	err = "unknown-ext-hardware-cache-result";
 570	if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
 571		goto out_err;
 572
 573	err = "invalid-cache";
 574	if (!perf_evsel__is_cache_op_valid(type, op))
 575		goto out_err;
 576
 577	return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
 578out_err:
 579	return scnprintf(bf, size, "%s", err);
 580}
 581
 582static int perf_evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
 583{
 584	int ret = __perf_evsel__hw_cache_name(evsel->core.attr.config, bf, size);
 585	return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 586}
 587
 588static int perf_evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
 589{
 590	int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
 591	return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
 592}
 593
 594static int perf_evsel__tool_name(char *bf, size_t size)
 595{
 596	int ret = scnprintf(bf, size, "duration_time");
 597	return ret;
 598}
 599
 600const char *perf_evsel__name(struct evsel *evsel)
 601{
 602	char bf[128];
 603
 604	if (!evsel)
 605		goto out_unknown;
 606
 607	if (evsel->name)
 608		return evsel->name;
 609
 610	switch (evsel->core.attr.type) {
 611	case PERF_TYPE_RAW:
 612		perf_evsel__raw_name(evsel, bf, sizeof(bf));
 613		break;
 614
 615	case PERF_TYPE_HARDWARE:
 616		perf_evsel__hw_name(evsel, bf, sizeof(bf));
 617		break;
 618
 619	case PERF_TYPE_HW_CACHE:
 620		perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
 621		break;
 622
 623	case PERF_TYPE_SOFTWARE:
 624		if (evsel->tool_event)
 625			perf_evsel__tool_name(bf, sizeof(bf));
 626		else
 627			perf_evsel__sw_name(evsel, bf, sizeof(bf));
 628		break;
 629
 630	case PERF_TYPE_TRACEPOINT:
 631		scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
 632		break;
 633
 634	case PERF_TYPE_BREAKPOINT:
 635		perf_evsel__bp_name(evsel, bf, sizeof(bf));
 636		break;
 637
 638	default:
 639		scnprintf(bf, sizeof(bf), "unknown attr type: %d",
 640			  evsel->core.attr.type);
 641		break;
 642	}
 643
 644	evsel->name = strdup(bf);
 645
 646	if (evsel->name)
 647		return evsel->name;
 648out_unknown:
 649	return "unknown";
 650}
 651
 652const char *perf_evsel__group_name(struct evsel *evsel)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 653{
 654	return evsel->group_name ?: "anon group";
 655}
 656
 657/*
 658 * Returns the group details for the specified leader,
 659 * with following rules.
 660 *
 661 *  For record -e '{cycles,instructions}'
 662 *    'anon group { cycles:u, instructions:u }'
 663 *
 664 *  For record -e 'cycles,instructions' and report --group
 665 *    'cycles:u, instructions:u'
 666 */
 667int perf_evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
 668{
 669	int ret = 0;
 670	struct evsel *pos;
 671	const char *group_name = perf_evsel__group_name(evsel);
 672
 673	if (!evsel->forced_leader)
 674		ret = scnprintf(buf, size, "%s { ", group_name);
 675
 676	ret += scnprintf(buf + ret, size - ret, "%s",
 677			 perf_evsel__name(evsel));
 678
 679	for_each_group_member(pos, evsel)
 680		ret += scnprintf(buf + ret, size - ret, ", %s",
 681				 perf_evsel__name(pos));
 682
 683	if (!evsel->forced_leader)
 684		ret += scnprintf(buf + ret, size - ret, " }");
 685
 686	return ret;
 687}
 688
 689static void __perf_evsel__config_callchain(struct evsel *evsel,
 690					   struct record_opts *opts,
 691					   struct callchain_param *param)
 692{
 693	bool function = perf_evsel__is_function_event(evsel);
 694	struct perf_event_attr *attr = &evsel->core.attr;
 
 695
 696	perf_evsel__set_sample_bit(evsel, CALLCHAIN);
 697
 698	attr->sample_max_stack = param->max_stack;
 699
 700	if (opts->kernel_callchains)
 701		attr->exclude_callchain_user = 1;
 702	if (opts->user_callchains)
 703		attr->exclude_callchain_kernel = 1;
 704	if (param->record_mode == CALLCHAIN_LBR) {
 705		if (!opts->branch_stack) {
 706			if (attr->exclude_user) {
 707				pr_warning("LBR callstack option is only available "
 708					   "to get user callchain information. "
 709					   "Falling back to framepointers.\n");
 710			} else {
 711				perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 712				attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
 713							PERF_SAMPLE_BRANCH_CALL_STACK |
 714							PERF_SAMPLE_BRANCH_NO_CYCLES |
 715							PERF_SAMPLE_BRANCH_NO_FLAGS;
 
 716			}
 717		} else
 718			 pr_warning("Cannot use LBR callstack with branch stack. "
 719				    "Falling back to framepointers.\n");
 720	}
 721
 722	if (param->record_mode == CALLCHAIN_DWARF) {
 723		if (!function) {
 724			perf_evsel__set_sample_bit(evsel, REGS_USER);
 725			perf_evsel__set_sample_bit(evsel, STACK_USER);
 726			if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
 727				attr->sample_regs_user |= DWARF_MINIMAL_REGS;
 
 728				pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
 729					   "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
 730					   "so the minimal registers set (IP, SP) is explicitly forced.\n");
 731			} else {
 732				attr->sample_regs_user |= PERF_REGS_MASK;
 733			}
 734			attr->sample_stack_user = param->dump_size;
 735			attr->exclude_callchain_user = 1;
 736		} else {
 737			pr_info("Cannot use DWARF unwind for function trace event,"
 738				" falling back to framepointers.\n");
 739		}
 740	}
 741
 742	if (function) {
 743		pr_info("Disabling user space callchains for function trace event.\n");
 744		attr->exclude_callchain_user = 1;
 745	}
 746}
 747
 748void perf_evsel__config_callchain(struct evsel *evsel,
 749				  struct record_opts *opts,
 750				  struct callchain_param *param)
 751{
 752	if (param->enabled)
 753		return __perf_evsel__config_callchain(evsel, opts, param);
 754}
 755
 756static void
 757perf_evsel__reset_callgraph(struct evsel *evsel,
 758			    struct callchain_param *param)
 759{
 760	struct perf_event_attr *attr = &evsel->core.attr;
 761
 762	perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
 763	if (param->record_mode == CALLCHAIN_LBR) {
 764		perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 765		attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
 766					      PERF_SAMPLE_BRANCH_CALL_STACK);
 
 767	}
 768	if (param->record_mode == CALLCHAIN_DWARF) {
 769		perf_evsel__reset_sample_bit(evsel, REGS_USER);
 770		perf_evsel__reset_sample_bit(evsel, STACK_USER);
 771	}
 772}
 773
 774static void apply_config_terms(struct evsel *evsel,
 775			       struct record_opts *opts, bool track)
 776{
 777	struct perf_evsel_config_term *term;
 778	struct list_head *config_terms = &evsel->config_terms;
 779	struct perf_event_attr *attr = &evsel->core.attr;
 780	/* callgraph default */
 781	struct callchain_param param = {
 782		.record_mode = callchain_param.record_mode,
 783	};
 784	u32 dump_size = 0;
 785	int max_stack = 0;
 786	const char *callgraph_buf = NULL;
 787
 788	list_for_each_entry(term, config_terms, list) {
 789		switch (term->type) {
 790		case PERF_EVSEL__CONFIG_TERM_PERIOD:
 791			if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
 792				attr->sample_period = term->val.period;
 793				attr->freq = 0;
 794				perf_evsel__reset_sample_bit(evsel, PERIOD);
 795			}
 796			break;
 797		case PERF_EVSEL__CONFIG_TERM_FREQ:
 798			if (!(term->weak && opts->user_freq != UINT_MAX)) {
 799				attr->sample_freq = term->val.freq;
 800				attr->freq = 1;
 801				perf_evsel__set_sample_bit(evsel, PERIOD);
 802			}
 803			break;
 804		case PERF_EVSEL__CONFIG_TERM_TIME:
 805			if (term->val.time)
 806				perf_evsel__set_sample_bit(evsel, TIME);
 807			else
 808				perf_evsel__reset_sample_bit(evsel, TIME);
 809			break;
 810		case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
 811			callgraph_buf = term->val.callgraph;
 812			break;
 813		case PERF_EVSEL__CONFIG_TERM_BRANCH:
 814			if (term->val.branch && strcmp(term->val.branch, "no")) {
 815				perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 816				parse_branch_str(term->val.branch,
 817						 &attr->branch_sample_type);
 818			} else
 819				perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 820			break;
 821		case PERF_EVSEL__CONFIG_TERM_STACK_USER:
 822			dump_size = term->val.stack_user;
 823			break;
 824		case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
 825			max_stack = term->val.max_stack;
 826			break;
 827		case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
 828			evsel->max_events = term->val.max_events;
 829			break;
 830		case PERF_EVSEL__CONFIG_TERM_INHERIT:
 831			/*
 832			 * attr->inherit should has already been set by
 833			 * perf_evsel__config. If user explicitly set
 834			 * inherit using config terms, override global
 835			 * opt->no_inherit setting.
 836			 */
 837			attr->inherit = term->val.inherit ? 1 : 0;
 838			break;
 839		case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
 840			attr->write_backward = term->val.overwrite ? 1 : 0;
 841			break;
 842		case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
 843			break;
 844		case PERF_EVSEL__CONFIG_TERM_PERCORE:
 845			break;
 846		case PERF_EVSEL__CONFIG_TERM_AUX_OUTPUT:
 847			attr->aux_output = term->val.aux_output ? 1 : 0;
 848			break;
 
 
 
 
 
 849		default:
 850			break;
 851		}
 852	}
 853
 854	/* User explicitly set per-event callgraph, clear the old setting and reset. */
 855	if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
 856		bool sample_address = false;
 857
 858		if (max_stack) {
 859			param.max_stack = max_stack;
 860			if (callgraph_buf == NULL)
 861				callgraph_buf = "fp";
 862		}
 863
 864		/* parse callgraph parameters */
 865		if (callgraph_buf != NULL) {
 866			if (!strcmp(callgraph_buf, "no")) {
 867				param.enabled = false;
 868				param.record_mode = CALLCHAIN_NONE;
 869			} else {
 870				param.enabled = true;
 871				if (parse_callchain_record(callgraph_buf, &param)) {
 872					pr_err("per-event callgraph setting for %s failed. "
 873					       "Apply callgraph global setting for it\n",
 874					       evsel->name);
 875					return;
 876				}
 877				if (param.record_mode == CALLCHAIN_DWARF)
 878					sample_address = true;
 879			}
 880		}
 881		if (dump_size > 0) {
 882			dump_size = round_up(dump_size, sizeof(u64));
 883			param.dump_size = dump_size;
 884		}
 885
 886		/* If global callgraph set, clear it */
 887		if (callchain_param.enabled)
 888			perf_evsel__reset_callgraph(evsel, &callchain_param);
 889
 890		/* set perf-event callgraph */
 891		if (param.enabled) {
 892			if (sample_address) {
 893				perf_evsel__set_sample_bit(evsel, ADDR);
 894				perf_evsel__set_sample_bit(evsel, DATA_SRC);
 895				evsel->core.attr.mmap_data = track;
 896			}
 897			perf_evsel__config_callchain(evsel, opts, &param);
 898		}
 899	}
 900}
 901
 902static bool is_dummy_event(struct evsel *evsel)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 903{
 904	return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) &&
 905	       (evsel->core.attr.config == PERF_COUNT_SW_DUMMY);
 906}
 907
 908/*
 909 * The enable_on_exec/disabled value strategy:
 910 *
 911 *  1) For any type of traced program:
 912 *    - all independent events and group leaders are disabled
 913 *    - all group members are enabled
 914 *
 915 *     Group members are ruled by group leaders. They need to
 916 *     be enabled, because the group scheduling relies on that.
 917 *
 918 *  2) For traced programs executed by perf:
 919 *     - all independent events and group leaders have
 920 *       enable_on_exec set
 921 *     - we don't specifically enable or disable any event during
 922 *       the record command
 923 *
 924 *     Independent events and group leaders are initially disabled
 925 *     and get enabled by exec. Group members are ruled by group
 926 *     leaders as stated in 1).
 927 *
 928 *  3) For traced programs attached by perf (pid/tid):
 929 *     - we specifically enable or disable all events during
 930 *       the record command
 931 *
 932 *     When attaching events to already running traced we
 933 *     enable/disable events specifically, as there's no
 934 *     initial traced exec call.
 935 */
 936void perf_evsel__config(struct evsel *evsel, struct record_opts *opts,
 937			struct callchain_param *callchain)
 938{
 939	struct evsel *leader = evsel->leader;
 940	struct perf_event_attr *attr = &evsel->core.attr;
 941	int track = evsel->tracking;
 942	bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
 943
 944	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
 945	attr->inherit	    = !opts->no_inherit;
 946	attr->write_backward = opts->overwrite ? 1 : 0;
 
 947
 948	perf_evsel__set_sample_bit(evsel, IP);
 949	perf_evsel__set_sample_bit(evsel, TID);
 950
 951	if (evsel->sample_read) {
 952		perf_evsel__set_sample_bit(evsel, READ);
 953
 954		/*
 955		 * We need ID even in case of single event, because
 956		 * PERF_SAMPLE_READ process ID specific data.
 957		 */
 958		perf_evsel__set_sample_id(evsel, false);
 959
 960		/*
 961		 * Apply group format only if we belong to group
 962		 * with more than one members.
 963		 */
 964		if (leader->core.nr_members > 1) {
 965			attr->read_format |= PERF_FORMAT_GROUP;
 966			attr->inherit = 0;
 967		}
 968	}
 969
 970	/*
 971	 * We default some events to have a default interval. But keep
 972	 * it a weak assumption overridable by the user.
 973	 */
 974	if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
 975				     opts->user_interval != ULLONG_MAX)) {
 976		if (opts->freq) {
 977			perf_evsel__set_sample_bit(evsel, PERIOD);
 978			attr->freq		= 1;
 979			attr->sample_freq	= opts->freq;
 980		} else {
 981			attr->sample_period = opts->default_interval;
 982		}
 983	}
 984
 985	/*
 986	 * Disable sampling for all group members other
 987	 * than leader in case leader 'leads' the sampling.
 988	 */
 989	if ((leader != evsel) && leader->sample_read) {
 990		attr->freq           = 0;
 991		attr->sample_freq    = 0;
 992		attr->sample_period  = 0;
 993		attr->write_backward = 0;
 994
 995		/*
 996		 * We don't get sample for slave events, we make them
 997		 * when delivering group leader sample. Set the slave
 998		 * event to follow the master sample_type to ease up
 999		 * report.
1000		 */
1001		attr->sample_type = leader->core.attr.sample_type;
1002	}
1003
1004	if (opts->no_samples)
1005		attr->sample_freq = 0;
1006
1007	if (opts->inherit_stat) {
1008		evsel->core.attr.read_format |=
1009			PERF_FORMAT_TOTAL_TIME_ENABLED |
1010			PERF_FORMAT_TOTAL_TIME_RUNNING |
1011			PERF_FORMAT_ID;
1012		attr->inherit_stat = 1;
1013	}
1014
1015	if (opts->sample_address) {
1016		perf_evsel__set_sample_bit(evsel, ADDR);
1017		attr->mmap_data = track;
1018	}
1019
1020	/*
1021	 * We don't allow user space callchains for  function trace
1022	 * event, due to issues with page faults while tracing page
1023	 * fault handler and its overall trickiness nature.
1024	 */
1025	if (perf_evsel__is_function_event(evsel))
1026		evsel->core.attr.exclude_callchain_user = 1;
1027
1028	if (callchain && callchain->enabled && !evsel->no_aux_samples)
1029		perf_evsel__config_callchain(evsel, opts, callchain);
1030
1031	if (opts->sample_intr_regs) {
 
1032		attr->sample_regs_intr = opts->sample_intr_regs;
1033		perf_evsel__set_sample_bit(evsel, REGS_INTR);
1034	}
1035
1036	if (opts->sample_user_regs) {
 
1037		attr->sample_regs_user |= opts->sample_user_regs;
1038		perf_evsel__set_sample_bit(evsel, REGS_USER);
1039	}
1040
1041	if (target__has_cpu(&opts->target) || opts->sample_cpu)
1042		perf_evsel__set_sample_bit(evsel, CPU);
1043
1044	/*
1045	 * When the user explicitly disabled time don't force it here.
1046	 */
1047	if (opts->sample_time &&
1048	    (!perf_missing_features.sample_id_all &&
1049	    (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1050	     opts->sample_time_set)))
1051		perf_evsel__set_sample_bit(evsel, TIME);
1052
1053	if (opts->raw_samples && !evsel->no_aux_samples) {
1054		perf_evsel__set_sample_bit(evsel, TIME);
1055		perf_evsel__set_sample_bit(evsel, RAW);
1056		perf_evsel__set_sample_bit(evsel, CPU);
1057	}
1058
1059	if (opts->sample_address)
1060		perf_evsel__set_sample_bit(evsel, DATA_SRC);
1061
1062	if (opts->sample_phys_addr)
1063		perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1064
1065	if (opts->no_buffering) {
1066		attr->watermark = 0;
1067		attr->wakeup_events = 1;
1068	}
1069	if (opts->branch_stack && !evsel->no_aux_samples) {
1070		perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1071		attr->branch_sample_type = opts->branch_stack;
1072	}
1073
1074	if (opts->sample_weight)
1075		perf_evsel__set_sample_bit(evsel, WEIGHT);
1076
1077	attr->task  = track;
1078	attr->mmap  = track;
1079	attr->mmap2 = track && !perf_missing_features.mmap2;
1080	attr->comm  = track;
1081	attr->ksymbol = track && !perf_missing_features.ksymbol;
 
 
 
 
 
 
 
1082	attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1083
1084	if (opts->record_namespaces)
1085		attr->namespaces  = track;
1086
 
 
 
 
 
 
 
 
 
 
 
1087	if (opts->record_switch_events)
1088		attr->context_switch = track;
1089
1090	if (opts->sample_transaction)
1091		perf_evsel__set_sample_bit(evsel, TRANSACTION);
1092
1093	if (opts->running_time) {
1094		evsel->core.attr.read_format |=
1095			PERF_FORMAT_TOTAL_TIME_ENABLED |
1096			PERF_FORMAT_TOTAL_TIME_RUNNING;
1097	}
1098
1099	/*
1100	 * XXX see the function comment above
1101	 *
1102	 * Disabling only independent events or group leaders,
1103	 * keeping group members enabled.
1104	 */
1105	if (perf_evsel__is_group_leader(evsel))
1106		attr->disabled = 1;
1107
1108	/*
1109	 * Setting enable_on_exec for independent events and
1110	 * group leaders for traced executed by perf.
1111	 */
1112	if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1113		!opts->initial_delay)
1114		attr->enable_on_exec = 1;
1115
1116	if (evsel->immediate) {
1117		attr->disabled = 0;
1118		attr->enable_on_exec = 0;
1119	}
1120
1121	clockid = opts->clockid;
1122	if (opts->use_clockid) {
1123		attr->use_clockid = 1;
1124		attr->clockid = opts->clockid;
1125	}
1126
1127	if (evsel->precise_max)
1128		attr->precise_ip = 3;
1129
1130	if (opts->all_user) {
1131		attr->exclude_kernel = 1;
1132		attr->exclude_user   = 0;
1133	}
1134
1135	if (opts->all_kernel) {
1136		attr->exclude_kernel = 0;
1137		attr->exclude_user   = 1;
1138	}
1139
1140	if (evsel->core.own_cpus || evsel->unit)
1141		evsel->core.attr.read_format |= PERF_FORMAT_ID;
1142
1143	/*
1144	 * Apply event specific term settings,
1145	 * it overloads any global configuration.
1146	 */
1147	apply_config_terms(evsel, opts, track);
1148
1149	evsel->ignore_missing_thread = opts->ignore_missing_thread;
1150
1151	/* The --period option takes the precedence. */
1152	if (opts->period_set) {
1153		if (opts->period)
1154			perf_evsel__set_sample_bit(evsel, PERIOD);
1155		else
1156			perf_evsel__reset_sample_bit(evsel, PERIOD);
1157	}
1158
1159	/*
 
 
 
1160	 * For initial_delay, a dummy event is added implicitly.
1161	 * The software event will trigger -EOPNOTSUPP error out,
1162	 * if BRANCH_STACK bit is set.
1163	 */
1164	if (opts->initial_delay && is_dummy_event(evsel))
1165		perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
 
 
 
 
 
1166}
1167
1168int perf_evsel__set_filter(struct evsel *evsel, const char *filter)
1169{
1170	char *new_filter = strdup(filter);
1171
1172	if (new_filter != NULL) {
1173		free(evsel->filter);
1174		evsel->filter = new_filter;
1175		return 0;
1176	}
1177
1178	return -1;
1179}
1180
1181static int perf_evsel__append_filter(struct evsel *evsel,
1182				     const char *fmt, const char *filter)
1183{
1184	char *new_filter;
1185
1186	if (evsel->filter == NULL)
1187		return perf_evsel__set_filter(evsel, filter);
1188
1189	if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1190		free(evsel->filter);
1191		evsel->filter = new_filter;
1192		return 0;
1193	}
1194
1195	return -1;
1196}
1197
1198int perf_evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1199{
1200	return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1201}
1202
1203int perf_evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1204{
1205	return perf_evsel__append_filter(evsel, "%s,%s", filter);
 
 
 
 
 
 
1206}
1207
1208int evsel__enable(struct evsel *evsel)
1209{
1210	int err = perf_evsel__enable(&evsel->core);
1211
1212	if (!err)
1213		evsel->disabled = false;
1214
1215	return err;
1216}
1217
 
 
 
 
 
 
1218int evsel__disable(struct evsel *evsel)
1219{
1220	int err = perf_evsel__disable(&evsel->core);
1221	/*
1222	 * We mark it disabled here so that tools that disable a event can
1223	 * ignore events after they disable it. I.e. the ring buffer may have
1224	 * already a few more events queued up before the kernel got the stop
1225	 * request.
1226	 */
1227	if (!err)
1228		evsel->disabled = true;
1229
1230	return err;
1231}
1232
1233static void perf_evsel__free_config_terms(struct evsel *evsel)
1234{
1235	struct perf_evsel_config_term *term, *h;
1236
1237	list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1238		list_del_init(&term->list);
 
 
1239		free(term);
1240	}
1241}
1242
1243void perf_evsel__exit(struct evsel *evsel)
 
 
 
 
 
1244{
1245	assert(list_empty(&evsel->core.node));
1246	assert(evsel->evlist == NULL);
1247	perf_evsel__free_counts(evsel);
 
 
1248	perf_evsel__free_fd(&evsel->core);
1249	perf_evsel__free_id(&evsel->core);
1250	perf_evsel__free_config_terms(evsel);
1251	cgroup__put(evsel->cgrp);
1252	perf_cpu_map__put(evsel->core.cpus);
1253	perf_cpu_map__put(evsel->core.own_cpus);
1254	perf_thread_map__put(evsel->core.threads);
1255	zfree(&evsel->group_name);
1256	zfree(&evsel->name);
 
 
 
 
 
 
 
 
 
1257	perf_evsel__object.fini(evsel);
1258}
1259
1260void evsel__delete(struct evsel *evsel)
1261{
1262	perf_evsel__exit(evsel);
 
 
 
1263	free(evsel);
1264}
1265
1266void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
1267				struct perf_counts_values *count)
1268{
1269	struct perf_counts_values tmp;
1270
1271	if (!evsel->prev_raw_counts)
1272		return;
1273
1274	if (cpu == -1) {
1275		tmp = evsel->prev_raw_counts->aggr;
1276		evsel->prev_raw_counts->aggr = *count;
1277	} else {
1278		tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1279		*perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1280	}
1281
1282	count->val = count->val - tmp.val;
1283	count->ena = count->ena - tmp.ena;
1284	count->run = count->run - tmp.run;
1285}
1286
1287void perf_counts_values__scale(struct perf_counts_values *count,
1288			       bool scale, s8 *pscaled)
1289{
1290	s8 scaled = 0;
1291
1292	if (scale) {
1293		if (count->run == 0) {
1294			scaled = -1;
1295			count->val = 0;
1296		} else if (count->run < count->ena) {
1297			scaled = 1;
1298			count->val = (u64)((double) count->val * count->ena / count->run);
1299		}
1300	}
1301
1302	if (pscaled)
1303		*pscaled = scaled;
1304}
1305
1306static int
1307perf_evsel__read_one(struct evsel *evsel, int cpu, int thread)
1308{
1309	struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1310
1311	return perf_evsel__read(&evsel->core, cpu, thread, count);
1312}
1313
1314static void
1315perf_evsel__set_count(struct evsel *counter, int cpu, int thread,
1316		      u64 val, u64 ena, u64 run)
1317{
1318	struct perf_counts_values *count;
1319
1320	count = perf_counts(counter->counts, cpu, thread);
1321
1322	count->val    = val;
1323	count->ena    = ena;
1324	count->run    = run;
 
1325
1326	perf_counts__set_loaded(counter->counts, cpu, thread, true);
1327}
1328
1329static int
1330perf_evsel__process_group_data(struct evsel *leader,
1331			       int cpu, int thread, u64 *data)
1332{
1333	u64 read_format = leader->core.attr.read_format;
1334	struct sample_read_value *v;
1335	u64 nr, ena = 0, run = 0, i;
1336
1337	nr = *data++;
1338
1339	if (nr != (u64) leader->core.nr_members)
1340		return -EINVAL;
1341
1342	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1343		ena = *data++;
1344
1345	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1346		run = *data++;
1347
1348	v = (struct sample_read_value *) data;
1349
1350	perf_evsel__set_count(leader, cpu, thread,
1351			      v[0].value, ena, run);
1352
1353	for (i = 1; i < nr; i++) {
1354		struct evsel *counter;
1355
1356		counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1357		if (!counter)
1358			return -EINVAL;
1359
1360		perf_evsel__set_count(counter, cpu, thread,
1361				      v[i].value, ena, run);
 
 
1362	}
1363
1364	return 0;
1365}
1366
1367static int
1368perf_evsel__read_group(struct evsel *leader, int cpu, int thread)
1369{
1370	struct perf_stat_evsel *ps = leader->stats;
1371	u64 read_format = leader->core.attr.read_format;
1372	int size = perf_evsel__read_size(&leader->core);
1373	u64 *data = ps->group_data;
1374
1375	if (!(read_format & PERF_FORMAT_ID))
1376		return -EINVAL;
1377
1378	if (!perf_evsel__is_group_leader(leader))
1379		return -EINVAL;
1380
1381	if (!data) {
1382		data = zalloc(size);
1383		if (!data)
1384			return -ENOMEM;
1385
1386		ps->group_data = data;
1387	}
1388
1389	if (FD(leader, cpu, thread) < 0)
1390		return -EINVAL;
1391
1392	if (readn(FD(leader, cpu, thread), data, size) <= 0)
1393		return -errno;
1394
1395	return perf_evsel__process_group_data(leader, cpu, thread, data);
1396}
1397
1398int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread)
1399{
1400	u64 read_format = evsel->core.attr.read_format;
1401
1402	if (read_format & PERF_FORMAT_GROUP)
1403		return perf_evsel__read_group(evsel, cpu, thread);
1404	else
1405		return perf_evsel__read_one(evsel, cpu, thread);
1406}
1407
1408int __perf_evsel__read_on_cpu(struct evsel *evsel,
1409			      int cpu, int thread, bool scale)
1410{
1411	struct perf_counts_values count;
1412	size_t nv = scale ? 3 : 1;
1413
1414	if (FD(evsel, cpu, thread) < 0)
1415		return -EINVAL;
1416
1417	if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1418		return -ENOMEM;
1419
1420	if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1421		return -errno;
1422
1423	perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1424	perf_counts_values__scale(&count, scale, NULL);
1425	*perf_counts(evsel->counts, cpu, thread) = count;
1426	return 0;
1427}
1428
1429static int get_group_fd(struct evsel *evsel, int cpu, int thread)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1430{
1431	struct evsel *leader = evsel->leader;
1432	int fd;
1433
1434	if (perf_evsel__is_group_leader(evsel))
1435		return -1;
1436
1437	/*
1438	 * Leader must be already processed/open,
1439	 * if not it's a bug.
1440	 */
1441	BUG_ON(!leader->core.fd);
1442
1443	fd = FD(leader, cpu, thread);
1444	BUG_ON(fd == -1);
 
 
 
 
1445
1446	return fd;
 
 
 
 
1447}
1448
1449static void perf_evsel__remove_fd(struct evsel *pos,
1450				  int nr_cpus, int nr_threads,
1451				  int thread_idx)
1452{
1453	for (int cpu = 0; cpu < nr_cpus; cpu++)
1454		for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1455			FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1456}
1457
1458static int update_fds(struct evsel *evsel,
1459		      int nr_cpus, int cpu_idx,
1460		      int nr_threads, int thread_idx)
1461{
1462	struct evsel *pos;
1463
1464	if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1465		return -EINVAL;
1466
1467	evlist__for_each_entry(evsel->evlist, pos) {
1468		nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1469
1470		perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1471
1472		/*
1473		 * Since fds for next evsel has not been created,
1474		 * there is no need to iterate whole event list.
1475		 */
1476		if (pos == evsel)
1477			break;
1478	}
1479	return 0;
1480}
1481
1482static bool ignore_missing_thread(struct evsel *evsel,
1483				  int nr_cpus, int cpu,
1484				  struct perf_thread_map *threads,
1485				  int thread, int err)
1486{
1487	pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1488
1489	if (!evsel->ignore_missing_thread)
1490		return false;
1491
1492	/* The system wide setup does not work with threads. */
1493	if (evsel->core.system_wide)
1494		return false;
1495
1496	/* The -ESRCH is perf event syscall errno for pid's not found. */
1497	if (err != -ESRCH)
1498		return false;
1499
1500	/* If there's only one thread, let it fail. */
1501	if (threads->nr == 1)
1502		return false;
1503
1504	/*
1505	 * We should remove fd for missing_thread first
1506	 * because thread_map__remove() will decrease threads->nr.
1507	 */
1508	if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1509		return false;
1510
1511	if (thread_map__remove(threads, thread))
1512		return false;
1513
1514	pr_warning("WARNING: Ignored open failure for pid %d\n",
1515		   ignore_pid);
1516	return true;
1517}
1518
1519static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1520				void *priv __maybe_unused)
1521{
1522	return fprintf(fp, "  %-32s %s\n", name, val);
1523}
1524
1525static void display_attr(struct perf_event_attr *attr)
1526{
1527	if (verbose >= 2) {
1528		fprintf(stderr, "%.60s\n", graph_dotted_line);
1529		fprintf(stderr, "perf_event_attr:\n");
1530		perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1531		fprintf(stderr, "%.60s\n", graph_dotted_line);
1532	}
1533}
1534
1535static int perf_event_open(struct evsel *evsel,
1536			   pid_t pid, int cpu, int group_fd,
1537			   unsigned long flags)
1538{
1539	int precise_ip = evsel->core.attr.precise_ip;
1540	int fd;
1541
1542	while (1) {
1543		pr_debug2("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
1544			  pid, cpu, group_fd, flags);
1545
1546		fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags);
1547		if (fd >= 0)
1548			break;
1549
1550		/* Do not try less precise if not requested. */
1551		if (!evsel->precise_max)
1552			break;
1553
1554		/*
1555		 * We tried all the precise_ip values, and it's
1556		 * still failing, so leave it to standard fallback.
1557		 */
1558		if (!evsel->core.attr.precise_ip) {
1559			evsel->core.attr.precise_ip = precise_ip;
1560			break;
1561		}
1562
1563		pr_debug2("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
1564		evsel->core.attr.precise_ip--;
1565		pr_debug2("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1566		display_attr(&evsel->core.attr);
 
 
 
1567	}
1568
1569	return fd;
 
 
 
 
 
 
1570}
1571
1572int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
 
 
 
1573		struct perf_thread_map *threads)
1574{
1575	int cpu, thread, nthreads;
1576	unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1577	int pid = -1, err;
1578	enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1579
1580	if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1581	    (perf_missing_features.aux_output     && evsel->core.attr.aux_output))
1582		return -EINVAL;
1583
1584	if (cpus == NULL) {
1585		static struct perf_cpu_map *empty_cpu_map;
1586
1587		if (empty_cpu_map == NULL) {
1588			empty_cpu_map = perf_cpu_map__dummy_new();
1589			if (empty_cpu_map == NULL)
1590				return -ENOMEM;
1591		}
1592
1593		cpus = empty_cpu_map;
1594	}
1595
1596	if (threads == NULL) {
1597		static struct perf_thread_map *empty_thread_map;
1598
1599		if (empty_thread_map == NULL) {
1600			empty_thread_map = thread_map__new_by_tid(-1);
1601			if (empty_thread_map == NULL)
1602				return -ENOMEM;
1603		}
1604
1605		threads = empty_thread_map;
1606	}
1607
1608	if (evsel->core.system_wide)
1609		nthreads = 1;
1610	else
1611		nthreads = threads->nr;
1612
1613	if (evsel->core.fd == NULL &&
1614	    perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
1615		return -ENOMEM;
1616
1617	if (evsel->cgrp) {
1618		flags |= PERF_FLAG_PID_CGROUP;
1619		pid = evsel->cgrp->fd;
1620	}
1621
1622fallback_missing_features:
 
 
 
 
 
 
 
 
 
 
 
 
1623	if (perf_missing_features.clockid_wrong)
1624		evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1625	if (perf_missing_features.clockid) {
1626		evsel->core.attr.use_clockid = 0;
1627		evsel->core.attr.clockid = 0;
1628	}
1629	if (perf_missing_features.cloexec)
1630		flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1631	if (perf_missing_features.mmap2)
1632		evsel->core.attr.mmap2 = 0;
1633	if (perf_missing_features.exclude_guest)
1634		evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1635	if (perf_missing_features.lbr_flags)
1636		evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1637				     PERF_SAMPLE_BRANCH_NO_CYCLES);
1638	if (perf_missing_features.group_read && evsel->core.attr.inherit)
1639		evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1640	if (perf_missing_features.ksymbol)
1641		evsel->core.attr.ksymbol = 0;
1642	if (perf_missing_features.bpf)
1643		evsel->core.attr.bpf_event = 0;
1644retry_sample_id:
 
1645	if (perf_missing_features.sample_id_all)
1646		evsel->core.attr.sample_id_all = 0;
 
 
 
 
 
 
 
 
 
 
 
 
1647
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1648	display_attr(&evsel->core.attr);
1649
1650	for (cpu = 0; cpu < cpus->nr; cpu++) {
1651
1652		for (thread = 0; thread < nthreads; thread++) {
1653			int fd, group_fd;
 
 
 
1654
1655			if (!evsel->cgrp && !evsel->core.system_wide)
1656				pid = perf_thread_map__pid(threads, thread);
1657
1658			group_fd = get_group_fd(evsel, cpu, thread);
1659retry_open:
 
 
 
 
 
 
1660			test_attr__ready();
1661
1662			fd = perf_event_open(evsel, pid, cpus->map[cpu],
1663					     group_fd, flags);
 
 
 
 
 
1664
1665			FD(evsel, cpu, thread) = fd;
1666
1667			if (fd < 0) {
1668				err = -errno;
1669
1670				if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1671					/*
1672					 * We just removed 1 thread, so take a step
1673					 * back on thread index and lower the upper
1674					 * nthreads limit.
1675					 */
1676					nthreads--;
1677					thread--;
1678
1679					/* ... and pretend like nothing have happened. */
1680					err = 0;
1681					continue;
1682				}
1683
1684				pr_debug2("\nsys_perf_event_open failed, error %d\n",
1685					  err);
1686				goto try_fallback;
1687			}
1688
1689			pr_debug2(" = %d\n", fd);
 
 
 
 
 
 
 
 
 
1690
1691			if (evsel->bpf_fd >= 0) {
1692				int evt_fd = fd;
1693				int bpf_fd = evsel->bpf_fd;
1694
1695				err = ioctl(evt_fd,
1696					    PERF_EVENT_IOC_SET_BPF,
1697					    bpf_fd);
1698				if (err && errno != EEXIST) {
1699					pr_err("failed to attach bpf fd %d: %s\n",
1700					       bpf_fd, strerror(errno));
1701					err = -EINVAL;
1702					goto out_close;
1703				}
1704			}
1705
1706			set_rlimit = NO_CHANGE;
1707
1708			/*
1709			 * If we succeeded but had to kill clockid, fail and
1710			 * have perf_evsel__open_strerror() print us a nice
1711			 * error.
1712			 */
1713			if (perf_missing_features.clockid ||
1714			    perf_missing_features.clockid_wrong) {
1715				err = -EINVAL;
1716				goto out_close;
1717			}
1718		}
1719	}
1720
1721	return 0;
1722
1723try_fallback:
 
 
 
 
 
 
 
 
 
 
 
 
1724	/*
1725	 * perf stat needs between 5 and 22 fds per CPU. When we run out
1726	 * of them try to increase the limits.
1727	 */
1728	if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1729		struct rlimit l;
1730		int old_errno = errno;
1731
1732		if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1733			if (set_rlimit == NO_CHANGE)
1734				l.rlim_cur = l.rlim_max;
1735			else {
1736				l.rlim_cur = l.rlim_max + 1000;
1737				l.rlim_max = l.rlim_cur;
1738			}
1739			if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1740				set_rlimit++;
1741				errno = old_errno;
1742				goto retry_open;
1743			}
1744		}
1745		errno = old_errno;
1746	}
1747
1748	if (err != -EINVAL || cpu > 0 || thread > 0)
1749		goto out_close;
1750
1751	/*
1752	 * Must probe features in the order they were added to the
1753	 * perf_event_attr interface.
1754	 */
1755	if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1756		perf_missing_features.aux_output = true;
1757		pr_debug2("Kernel has no attr.aux_output support, bailing out\n");
1758		goto out_close;
1759	} else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1760		perf_missing_features.bpf = true;
1761		pr_debug2("switching off bpf_event\n");
1762		goto fallback_missing_features;
1763	} else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1764		perf_missing_features.ksymbol = true;
1765		pr_debug2("switching off ksymbol\n");
1766		goto fallback_missing_features;
1767	} else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1768		perf_missing_features.write_backward = true;
1769		pr_debug2("switching off write_backward\n");
1770		goto out_close;
1771	} else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1772		perf_missing_features.clockid_wrong = true;
1773		pr_debug2("switching off clockid\n");
1774		goto fallback_missing_features;
1775	} else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1776		perf_missing_features.clockid = true;
1777		pr_debug2("switching off use_clockid\n");
1778		goto fallback_missing_features;
1779	} else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1780		perf_missing_features.cloexec = true;
1781		pr_debug2("switching off cloexec flag\n");
1782		goto fallback_missing_features;
1783	} else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1784		perf_missing_features.mmap2 = true;
1785		pr_debug2("switching off mmap2\n");
1786		goto fallback_missing_features;
1787	} else if (!perf_missing_features.exclude_guest &&
1788		   (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
1789		perf_missing_features.exclude_guest = true;
1790		pr_debug2("switching off exclude_guest, exclude_host\n");
1791		goto fallback_missing_features;
1792	} else if (!perf_missing_features.sample_id_all) {
1793		perf_missing_features.sample_id_all = true;
1794		pr_debug2("switching off sample_id_all\n");
1795		goto retry_sample_id;
1796	} else if (!perf_missing_features.lbr_flags &&
1797			(evsel->core.attr.branch_sample_type &
1798			 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1799			  PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1800		perf_missing_features.lbr_flags = true;
1801		pr_debug2("switching off branch sample type no (cycles/flags)\n");
1802		goto fallback_missing_features;
1803	} else if (!perf_missing_features.group_read &&
1804		    evsel->core.attr.inherit &&
1805		   (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1806		   perf_evsel__is_group_leader(evsel)) {
1807		perf_missing_features.group_read = true;
1808		pr_debug2("switching off group read\n");
1809		goto fallback_missing_features;
1810	}
1811out_close:
1812	if (err)
1813		threads->err_thread = thread;
1814
 
1815	do {
1816		while (--thread >= 0) {
1817			close(FD(evsel, cpu, thread));
1818			FD(evsel, cpu, thread) = -1;
 
1819		}
1820		thread = nthreads;
1821	} while (--cpu >= 0);
 
1822	return err;
1823}
1824
 
 
 
 
 
 
1825void evsel__close(struct evsel *evsel)
1826{
1827	perf_evsel__close(&evsel->core);
1828	perf_evsel__free_id(&evsel->core);
1829}
1830
1831int perf_evsel__open_per_cpu(struct evsel *evsel,
1832			     struct perf_cpu_map *cpus)
1833{
1834	return evsel__open(evsel, cpus, NULL);
 
 
 
1835}
1836
1837int perf_evsel__open_per_thread(struct evsel *evsel,
1838				struct perf_thread_map *threads)
1839{
1840	return evsel__open(evsel, NULL, threads);
1841}
1842
1843static int perf_evsel__parse_id_sample(const struct evsel *evsel,
1844				       const union perf_event *event,
1845				       struct perf_sample *sample)
1846{
1847	u64 type = evsel->core.attr.sample_type;
1848	const __u64 *array = event->sample.array;
1849	bool swapped = evsel->needs_swap;
1850	union u64_swap u;
1851
1852	array += ((event->header.size -
1853		   sizeof(event->header)) / sizeof(u64)) - 1;
1854
1855	if (type & PERF_SAMPLE_IDENTIFIER) {
1856		sample->id = *array;
1857		array--;
1858	}
1859
1860	if (type & PERF_SAMPLE_CPU) {
1861		u.val64 = *array;
1862		if (swapped) {
1863			/* undo swap of u64, then swap on individual u32s */
1864			u.val64 = bswap_64(u.val64);
1865			u.val32[0] = bswap_32(u.val32[0]);
1866		}
1867
1868		sample->cpu = u.val32[0];
1869		array--;
1870	}
1871
1872	if (type & PERF_SAMPLE_STREAM_ID) {
1873		sample->stream_id = *array;
1874		array--;
1875	}
1876
1877	if (type & PERF_SAMPLE_ID) {
1878		sample->id = *array;
1879		array--;
1880	}
1881
1882	if (type & PERF_SAMPLE_TIME) {
1883		sample->time = *array;
1884		array--;
1885	}
1886
1887	if (type & PERF_SAMPLE_TID) {
1888		u.val64 = *array;
1889		if (swapped) {
1890			/* undo swap of u64, then swap on individual u32s */
1891			u.val64 = bswap_64(u.val64);
1892			u.val32[0] = bswap_32(u.val32[0]);
1893			u.val32[1] = bswap_32(u.val32[1]);
1894		}
1895
1896		sample->pid = u.val32[0];
1897		sample->tid = u.val32[1];
1898		array--;
1899	}
1900
1901	return 0;
1902}
1903
1904static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1905			    u64 size)
1906{
1907	return size > max_size || offset + size > endp;
1908}
1909
1910#define OVERFLOW_CHECK(offset, size, max_size)				\
1911	do {								\
1912		if (overflow(endp, (max_size), (offset), (size)))	\
1913			return -EFAULT;					\
1914	} while (0)
1915
1916#define OVERFLOW_CHECK_u64(offset) \
1917	OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1918
1919static int
1920perf_event__check_size(union perf_event *event, unsigned int sample_size)
1921{
1922	/*
1923	 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1924	 * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
1925	 * check the format does not go past the end of the event.
1926	 */
1927	if (sample_size + sizeof(event->header) > event->header.size)
1928		return -EFAULT;
1929
1930	return 0;
1931}
1932
1933int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event,
1934			     struct perf_sample *data)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1935{
1936	u64 type = evsel->core.attr.sample_type;
1937	bool swapped = evsel->needs_swap;
1938	const __u64 *array;
1939	u16 max_size = event->header.size;
1940	const void *endp = (void *)event + max_size;
1941	u64 sz;
1942
1943	/*
1944	 * used for cross-endian analysis. See git commit 65014ab3
1945	 * for why this goofiness is needed.
1946	 */
1947	union u64_swap u;
1948
1949	memset(data, 0, sizeof(*data));
1950	data->cpu = data->pid = data->tid = -1;
1951	data->stream_id = data->id = data->time = -1ULL;
1952	data->period = evsel->core.attr.sample_period;
1953	data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1954	data->misc    = event->header.misc;
1955	data->id = -1ULL;
1956	data->data_src = PERF_MEM_DATA_SRC_NONE;
 
1957
1958	if (event->header.type != PERF_RECORD_SAMPLE) {
1959		if (!evsel->core.attr.sample_id_all)
1960			return 0;
1961		return perf_evsel__parse_id_sample(evsel, event, data);
1962	}
1963
1964	array = event->sample.array;
1965
1966	if (perf_event__check_size(event, evsel->sample_size))
1967		return -EFAULT;
1968
1969	if (type & PERF_SAMPLE_IDENTIFIER) {
1970		data->id = *array;
1971		array++;
1972	}
1973
1974	if (type & PERF_SAMPLE_IP) {
1975		data->ip = *array;
1976		array++;
1977	}
1978
1979	if (type & PERF_SAMPLE_TID) {
1980		u.val64 = *array;
1981		if (swapped) {
1982			/* undo swap of u64, then swap on individual u32s */
1983			u.val64 = bswap_64(u.val64);
1984			u.val32[0] = bswap_32(u.val32[0]);
1985			u.val32[1] = bswap_32(u.val32[1]);
1986		}
1987
1988		data->pid = u.val32[0];
1989		data->tid = u.val32[1];
1990		array++;
1991	}
1992
1993	if (type & PERF_SAMPLE_TIME) {
1994		data->time = *array;
1995		array++;
1996	}
1997
1998	if (type & PERF_SAMPLE_ADDR) {
1999		data->addr = *array;
2000		array++;
2001	}
2002
2003	if (type & PERF_SAMPLE_ID) {
2004		data->id = *array;
2005		array++;
2006	}
2007
2008	if (type & PERF_SAMPLE_STREAM_ID) {
2009		data->stream_id = *array;
2010		array++;
2011	}
2012
2013	if (type & PERF_SAMPLE_CPU) {
2014
2015		u.val64 = *array;
2016		if (swapped) {
2017			/* undo swap of u64, then swap on individual u32s */
2018			u.val64 = bswap_64(u.val64);
2019			u.val32[0] = bswap_32(u.val32[0]);
2020		}
2021
2022		data->cpu = u.val32[0];
2023		array++;
2024	}
2025
2026	if (type & PERF_SAMPLE_PERIOD) {
2027		data->period = *array;
2028		array++;
2029	}
2030
2031	if (type & PERF_SAMPLE_READ) {
2032		u64 read_format = evsel->core.attr.read_format;
2033
2034		OVERFLOW_CHECK_u64(array);
2035		if (read_format & PERF_FORMAT_GROUP)
2036			data->read.group.nr = *array;
2037		else
2038			data->read.one.value = *array;
2039
2040		array++;
2041
2042		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2043			OVERFLOW_CHECK_u64(array);
2044			data->read.time_enabled = *array;
2045			array++;
2046		}
2047
2048		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2049			OVERFLOW_CHECK_u64(array);
2050			data->read.time_running = *array;
2051			array++;
2052		}
2053
2054		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2055		if (read_format & PERF_FORMAT_GROUP) {
2056			const u64 max_group_nr = UINT64_MAX /
2057					sizeof(struct sample_read_value);
2058
2059			if (data->read.group.nr > max_group_nr)
2060				return -EFAULT;
2061			sz = data->read.group.nr *
2062			     sizeof(struct sample_read_value);
2063			OVERFLOW_CHECK(array, sz, max_size);
2064			data->read.group.values =
2065					(struct sample_read_value *)array;
2066			array = (void *)array + sz;
2067		} else {
2068			OVERFLOW_CHECK_u64(array);
2069			data->read.one.id = *array;
2070			array++;
 
 
 
 
 
 
2071		}
2072	}
2073
2074	if (evsel__has_callchain(evsel)) {
2075		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2076
2077		OVERFLOW_CHECK_u64(array);
2078		data->callchain = (struct ip_callchain *)array++;
2079		if (data->callchain->nr > max_callchain_nr)
2080			return -EFAULT;
2081		sz = data->callchain->nr * sizeof(u64);
2082		OVERFLOW_CHECK(array, sz, max_size);
2083		array = (void *)array + sz;
2084	}
2085
2086	if (type & PERF_SAMPLE_RAW) {
2087		OVERFLOW_CHECK_u64(array);
2088		u.val64 = *array;
2089
2090		/*
2091		 * Undo swap of u64, then swap on individual u32s,
2092		 * get the size of the raw area and undo all of the
2093		 * swap. The pevent interface handles endianity by
2094		 * itself.
2095		 */
2096		if (swapped) {
2097			u.val64 = bswap_64(u.val64);
2098			u.val32[0] = bswap_32(u.val32[0]);
2099			u.val32[1] = bswap_32(u.val32[1]);
2100		}
2101		data->raw_size = u.val32[0];
2102
2103		/*
2104		 * The raw data is aligned on 64bits including the
2105		 * u32 size, so it's safe to use mem_bswap_64.
2106		 */
2107		if (swapped)
2108			mem_bswap_64((void *) array, data->raw_size);
2109
2110		array = (void *)array + sizeof(u32);
2111
2112		OVERFLOW_CHECK(array, data->raw_size, max_size);
2113		data->raw_data = (void *)array;
2114		array = (void *)array + data->raw_size;
2115	}
2116
2117	if (type & PERF_SAMPLE_BRANCH_STACK) {
2118		const u64 max_branch_nr = UINT64_MAX /
2119					  sizeof(struct branch_entry);
 
 
2120
2121		OVERFLOW_CHECK_u64(array);
2122		data->branch_stack = (struct branch_stack *)array++;
2123
2124		if (data->branch_stack->nr > max_branch_nr)
2125			return -EFAULT;
 
2126		sz = data->branch_stack->nr * sizeof(struct branch_entry);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2127		OVERFLOW_CHECK(array, sz, max_size);
2128		array = (void *)array + sz;
 
 
 
 
 
 
 
 
 
 
2129	}
2130
2131	if (type & PERF_SAMPLE_REGS_USER) {
2132		OVERFLOW_CHECK_u64(array);
2133		data->user_regs.abi = *array;
2134		array++;
2135
2136		if (data->user_regs.abi) {
2137			u64 mask = evsel->core.attr.sample_regs_user;
2138
2139			sz = hweight64(mask) * sizeof(u64);
2140			OVERFLOW_CHECK(array, sz, max_size);
2141			data->user_regs.mask = mask;
2142			data->user_regs.regs = (u64 *)array;
2143			array = (void *)array + sz;
2144		}
2145	}
2146
2147	if (type & PERF_SAMPLE_STACK_USER) {
2148		OVERFLOW_CHECK_u64(array);
2149		sz = *array++;
2150
2151		data->user_stack.offset = ((char *)(array - 1)
2152					  - (char *) event);
2153
2154		if (!sz) {
2155			data->user_stack.size = 0;
2156		} else {
2157			OVERFLOW_CHECK(array, sz, max_size);
2158			data->user_stack.data = (char *)array;
2159			array = (void *)array + sz;
2160			OVERFLOW_CHECK_u64(array);
2161			data->user_stack.size = *array++;
2162			if (WARN_ONCE(data->user_stack.size > sz,
2163				      "user stack dump failure\n"))
2164				return -EFAULT;
2165		}
2166	}
2167
2168	if (type & PERF_SAMPLE_WEIGHT) {
2169		OVERFLOW_CHECK_u64(array);
2170		data->weight = *array;
2171		array++;
2172	}
2173
2174	if (type & PERF_SAMPLE_DATA_SRC) {
2175		OVERFLOW_CHECK_u64(array);
2176		data->data_src = *array;
2177		array++;
2178	}
2179
2180	if (type & PERF_SAMPLE_TRANSACTION) {
2181		OVERFLOW_CHECK_u64(array);
2182		data->transaction = *array;
2183		array++;
2184	}
2185
2186	data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2187	if (type & PERF_SAMPLE_REGS_INTR) {
2188		OVERFLOW_CHECK_u64(array);
2189		data->intr_regs.abi = *array;
2190		array++;
2191
2192		if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2193			u64 mask = evsel->core.attr.sample_regs_intr;
2194
2195			sz = hweight64(mask) * sizeof(u64);
2196			OVERFLOW_CHECK(array, sz, max_size);
2197			data->intr_regs.mask = mask;
2198			data->intr_regs.regs = (u64 *)array;
2199			array = (void *)array + sz;
2200		}
2201	}
2202
2203	data->phys_addr = 0;
2204	if (type & PERF_SAMPLE_PHYS_ADDR) {
2205		data->phys_addr = *array;
2206		array++;
2207	}
2208
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2209	return 0;
2210}
2211
2212int perf_evsel__parse_sample_timestamp(struct evsel *evsel,
2213				       union perf_event *event,
2214				       u64 *timestamp)
2215{
2216	u64 type = evsel->core.attr.sample_type;
2217	const __u64 *array;
2218
2219	if (!(type & PERF_SAMPLE_TIME))
2220		return -1;
2221
2222	if (event->header.type != PERF_RECORD_SAMPLE) {
2223		struct perf_sample data = {
2224			.time = -1ULL,
2225		};
2226
2227		if (!evsel->core.attr.sample_id_all)
2228			return -1;
2229		if (perf_evsel__parse_id_sample(evsel, event, &data))
2230			return -1;
2231
2232		*timestamp = data.time;
2233		return 0;
2234	}
2235
2236	array = event->sample.array;
2237
2238	if (perf_event__check_size(event, evsel->sample_size))
2239		return -EFAULT;
2240
2241	if (type & PERF_SAMPLE_IDENTIFIER)
2242		array++;
2243
2244	if (type & PERF_SAMPLE_IP)
2245		array++;
2246
2247	if (type & PERF_SAMPLE_TID)
2248		array++;
2249
2250	if (type & PERF_SAMPLE_TIME)
2251		*timestamp = *array;
2252
2253	return 0;
2254}
2255
2256struct tep_format_field *perf_evsel__field(struct evsel *evsel, const char *name)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2257{
2258	return tep_find_field(evsel->tp_format, name);
2259}
2260
2261void *perf_evsel__rawptr(struct evsel *evsel, struct perf_sample *sample,
2262			 const char *name)
 
 
 
 
2263{
2264	struct tep_format_field *field = perf_evsel__field(evsel, name);
2265	int offset;
2266
2267	if (!field)
2268		return NULL;
2269
2270	offset = field->offset;
2271
2272	if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2273		offset = *(int *)(sample->raw_data + field->offset);
2274		offset &= 0xffff;
 
 
2275	}
2276
2277	return sample->raw_data + offset;
2278}
2279
2280u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2281			 bool needs_swap)
2282{
2283	u64 value;
2284	void *ptr = sample->raw_data + field->offset;
2285
2286	switch (field->size) {
2287	case 1:
2288		return *(u8 *)ptr;
2289	case 2:
2290		value = *(u16 *)ptr;
2291		break;
2292	case 4:
2293		value = *(u32 *)ptr;
2294		break;
2295	case 8:
2296		memcpy(&value, ptr, sizeof(u64));
2297		break;
2298	default:
2299		return 0;
2300	}
2301
2302	if (!needs_swap)
2303		return value;
2304
2305	switch (field->size) {
2306	case 2:
2307		return bswap_16(value);
2308	case 4:
2309		return bswap_32(value);
2310	case 8:
2311		return bswap_64(value);
2312	default:
2313		return 0;
2314	}
2315
2316	return 0;
2317}
2318
2319u64 perf_evsel__intval(struct evsel *evsel, struct perf_sample *sample,
2320		       const char *name)
2321{
2322	struct tep_format_field *field = perf_evsel__field(evsel, name);
2323
2324	if (!field)
2325		return 0;
 
 
 
 
2326
2327	return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2328}
2329
2330bool perf_evsel__fallback(struct evsel *evsel, int err,
2331			  char *msg, size_t msgsize)
 
 
2332{
2333	int paranoid;
2334
2335	if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2336	    evsel->core.attr.type   == PERF_TYPE_HARDWARE &&
2337	    evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2338		/*
2339		 * If it's cycles then fall back to hrtimer based
2340		 * cpu-clock-tick sw counter, which is always available even if
2341		 * no PMU support.
2342		 *
2343		 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2344		 * b0a873e).
2345		 */
2346		scnprintf(msg, msgsize, "%s",
2347"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2348
2349		evsel->core.attr.type   = PERF_TYPE_SOFTWARE;
2350		evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
 
 
 
 
 
2351
2352		zfree(&evsel->name);
2353		return true;
2354	} else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2355		   (paranoid = perf_event_paranoid()) > 1) {
2356		const char *name = perf_evsel__name(evsel);
2357		char *new_name;
2358		const char *sep = ":";
2359
 
 
 
 
2360		/* Is there already the separator in the name. */
2361		if (strchr(name, '/') ||
2362		    strchr(name, ':'))
2363			sep = "";
2364
2365		if (asprintf(&new_name, "%s%su", name, sep) < 0)
2366			return false;
2367
2368		if (evsel->name)
2369			free(evsel->name);
2370		evsel->name = new_name;
2371		scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2372			  "to fall back to excluding kernel and hypervisor "
2373			  " samples", paranoid);
2374		evsel->core.attr.exclude_kernel = 1;
2375		evsel->core.attr.exclude_hv     = 1;
2376
2377		return true;
2378	}
2379
2380	return false;
2381}
2382
2383static bool find_process(const char *name)
2384{
2385	size_t len = strlen(name);
2386	DIR *dir;
2387	struct dirent *d;
2388	int ret = -1;
2389
2390	dir = opendir(procfs__mountpoint());
2391	if (!dir)
2392		return false;
2393
2394	/* Walk through the directory. */
2395	while (ret && (d = readdir(dir)) != NULL) {
2396		char path[PATH_MAX];
2397		char *data;
2398		size_t size;
2399
2400		if ((d->d_type != DT_DIR) ||
2401		     !strcmp(".", d->d_name) ||
2402		     !strcmp("..", d->d_name))
2403			continue;
2404
2405		scnprintf(path, sizeof(path), "%s/%s/comm",
2406			  procfs__mountpoint(), d->d_name);
2407
2408		if (filename__read_str(path, &data, &size))
2409			continue;
2410
2411		ret = strncmp(name, data, len);
2412		free(data);
2413	}
2414
2415	closedir(dir);
2416	return ret ? false : true;
2417}
2418
2419int perf_evsel__open_strerror(struct evsel *evsel, struct target *target,
2420			      int err, char *msg, size_t size)
 
 
 
 
 
 
 
2421{
2422	char sbuf[STRERR_BUFSIZE];
2423	int printed = 0;
 
2424
2425	switch (err) {
2426	case EPERM:
2427	case EACCES:
 
 
 
 
 
 
 
 
 
 
 
 
2428		if (err == EPERM)
2429			printed = scnprintf(msg, size,
2430				"No permission to enable %s event.\n\n",
2431				perf_evsel__name(evsel));
2432
2433		return scnprintf(msg + printed, size - printed,
2434		 "You may not have permission to collect %sstats.\n\n"
2435		 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2436		 "which controls use of the performance events system by\n"
2437		 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2438		 "The current value is %d:\n\n"
 
2439		 "  -1: Allow use of (almost) all events by all users\n"
2440		 "      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2441		 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2442		 "      Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2443		 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2444		 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2445		 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2446		 "	kernel.perf_event_paranoid = -1\n" ,
2447				 target->system_wide ? "system-wide " : "",
2448				 perf_event_paranoid());
2449	case ENOENT:
2450		return scnprintf(msg, size, "The %s event is not supported.",
2451				 perf_evsel__name(evsel));
2452	case EMFILE:
2453		return scnprintf(msg, size, "%s",
2454			 "Too many events are opened.\n"
2455			 "Probably the maximum number of open file descriptors has been reached.\n"
2456			 "Hint: Try again after reducing the number of events.\n"
2457			 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2458	case ENOMEM:
2459		if (evsel__has_callchain(evsel) &&
2460		    access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2461			return scnprintf(msg, size,
2462					 "Not enough memory to setup event with callchain.\n"
2463					 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2464					 "Hint: Current value: %d", sysctl__max_stack());
2465		break;
2466	case ENODEV:
2467		if (target->cpu_list)
2468			return scnprintf(msg, size, "%s",
2469	 "No such device - did you specify an out-of-range profile CPU?");
2470		break;
2471	case EOPNOTSUPP:
 
 
 
 
 
 
 
 
2472		if (evsel->core.attr.sample_period != 0)
2473			return scnprintf(msg, size,
2474	"%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2475					 perf_evsel__name(evsel));
2476		if (evsel->core.attr.precise_ip)
2477			return scnprintf(msg, size, "%s",
2478	"\'precise\' request may not be supported. Try removing 'p' modifier.");
2479#if defined(__i386__) || defined(__x86_64__)
2480		if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
2481			return scnprintf(msg, size, "%s",
2482	"No hardware sampling interrupt available.\n");
2483#endif
2484		break;
2485	case EBUSY:
2486		if (find_process("oprofiled"))
2487			return scnprintf(msg, size,
2488	"The PMU counters are busy/taken by another profiler.\n"
2489	"We found oprofile daemon running, please stop it and try again.");
2490		break;
2491	case EINVAL:
 
 
 
 
2492		if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
2493			return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2494		if (perf_missing_features.clockid)
2495			return scnprintf(msg, size, "clockid feature not supported.");
2496		if (perf_missing_features.clockid_wrong)
2497			return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2498		if (perf_missing_features.aux_output)
2499			return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
 
 
 
 
 
2500		break;
 
 
 
2501	default:
2502		break;
2503	}
2504
 
 
 
 
2505	return scnprintf(msg, size,
2506	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2507	"/bin/dmesg | grep -i perf may provide additional information.\n",
2508			 err, str_error_r(err, sbuf, sizeof(sbuf)),
2509			 perf_evsel__name(evsel));
2510}
2511
2512struct perf_env *perf_evsel__env(struct evsel *evsel)
2513{
2514	if (evsel && evsel->evlist)
2515		return evsel->evlist->env;
2516	return &perf_env;
2517}
2518
2519static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
2520{
2521	int cpu, thread;
2522
2523	for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
2524		for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
2525		     thread++) {
2526			int fd = FD(evsel, cpu, thread);
2527
2528			if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
2529						   cpu, thread, fd) < 0)
2530				return -1;
2531		}
2532	}
2533
2534	return 0;
2535}
2536
2537int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
2538{
2539	struct perf_cpu_map *cpus = evsel->core.cpus;
2540	struct perf_thread_map *threads = evsel->core.threads;
2541
2542	if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
2543		return -ENOMEM;
2544
2545	return store_evsel_ids(evsel, evlist);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2546}