evsel.c 59.5 KB
Newer Older
1 2 3 4 5 6 7 8 9
/*
 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Parts came from builtin-{top,stat,record}.c, see those files for further
 * copyright notes.
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */

10
#include <byteswap.h>
11
#include <linux/bitops.h>
12
#include <api/fs/tracing_path.h>
13 14 15
#include <traceevent/event-parse.h>
#include <linux/hw_breakpoint.h>
#include <linux/perf_event.h>
16
#include <linux/err.h>
17
#include <sys/resource.h>
18
#include "asm/bug.h"
19
#include "callchain.h"
20
#include "cgroup.h"
21
#include "evsel.h"
22
#include "evlist.h"
23
#include "util.h"
24
#include "cpumap.h"
25
#include "thread_map.h"
26
#include "target.h"
27
#include "perf_regs.h"
A
Adrian Hunter 已提交
28
#include "debug.h"
29
#include "trace-event.h"
30
#include "stat.h"
31

32 33 34
static struct {
	bool sample_id_all;
	bool exclude_guest;
35
	bool mmap2;
36
	bool cloexec;
37 38
	bool clockid;
	bool clockid_wrong;
39
	bool lbr_flags;
40
	bool write_backward;
41 42
} perf_missing_features;

43 44
static clockid_t clockid;

A
Arnaldo Carvalho de Melo 已提交
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
{
	return 0;
}

static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
{
}

static struct {
	size_t	size;
	int	(*init)(struct perf_evsel *evsel);
	void	(*fini)(struct perf_evsel *evsel);
} perf_evsel__object = {
	.size = sizeof(struct perf_evsel),
	.init = perf_evsel__no_extra_init,
	.fini = perf_evsel__no_extra_fini,
};

int perf_evsel__object_config(size_t object_size,
			      int (*init)(struct perf_evsel *evsel),
			      void (*fini)(struct perf_evsel *evsel))
{

	if (object_size == 0)
		goto set_methods;

	if (perf_evsel__object.size > object_size)
		return -EINVAL;

	perf_evsel__object.size = object_size;

set_methods:
	if (init != NULL)
		perf_evsel__object.init = init;

	if (fini != NULL)
		perf_evsel__object.fini = fini;

	return 0;
}

87 88
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))

89
int __perf_evsel__sample_size(u64 sample_type)
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104
{
	u64 mask = sample_type & PERF_SAMPLE_MASK;
	int size = 0;
	int i;

	for (i = 0; i < 64; i++) {
		if (mask & (1ULL << i))
			size++;
	}

	size *= sizeof(u64);

	return size;
}

105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
/**
 * __perf_evsel__calc_id_pos - calculate id_pos.
 * @sample_type: sample type
 *
 * This function returns the position of the event id (PERF_SAMPLE_ID or
 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
 * sample_event.
 */
static int __perf_evsel__calc_id_pos(u64 sample_type)
{
	int idx = 0;

	if (sample_type & PERF_SAMPLE_IDENTIFIER)
		return 0;

	if (!(sample_type & PERF_SAMPLE_ID))
		return -1;

	if (sample_type & PERF_SAMPLE_IP)
		idx += 1;

	if (sample_type & PERF_SAMPLE_TID)
		idx += 1;

	if (sample_type & PERF_SAMPLE_TIME)
		idx += 1;

	if (sample_type & PERF_SAMPLE_ADDR)
		idx += 1;

	return idx;
}

/**
 * __perf_evsel__calc_is_pos - calculate is_pos.
 * @sample_type: sample type
 *
 * This function returns the position (counting backwards) of the event id
 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
 * sample_id_all is used there is an id sample appended to non-sample events.
 */
static int __perf_evsel__calc_is_pos(u64 sample_type)
{
	int idx = 1;

	if (sample_type & PERF_SAMPLE_IDENTIFIER)
		return 1;

	if (!(sample_type & PERF_SAMPLE_ID))
		return -1;

	if (sample_type & PERF_SAMPLE_CPU)
		idx += 1;

	if (sample_type & PERF_SAMPLE_STREAM_ID)
		idx += 1;

	return idx;
}

void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
{
	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
}

171 172 173 174 175 176
void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
				  enum perf_event_sample_format bit)
{
	if (!(evsel->attr.sample_type & bit)) {
		evsel->attr.sample_type |= bit;
		evsel->sample_size += sizeof(u64);
177
		perf_evsel__calc_id_pos(evsel);
178 179 180 181 182 183 184 185 186
	}
}

void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
				    enum perf_event_sample_format bit)
{
	if (evsel->attr.sample_type & bit) {
		evsel->attr.sample_type &= ~bit;
		evsel->sample_size -= sizeof(u64);
187
		perf_evsel__calc_id_pos(evsel);
188 189 190
	}
}

191 192
void perf_evsel__set_sample_id(struct perf_evsel *evsel,
			       bool can_sample_identifier)
193
{
194 195 196 197 198 199
	if (can_sample_identifier) {
		perf_evsel__reset_sample_bit(evsel, ID);
		perf_evsel__set_sample_bit(evsel, IDENTIFIER);
	} else {
		perf_evsel__set_sample_bit(evsel, ID);
	}
200 201 202
	evsel->attr.read_format |= PERF_FORMAT_ID;
}

203 204 205 206
void perf_evsel__init(struct perf_evsel *evsel,
		      struct perf_event_attr *attr, int idx)
{
	evsel->idx	   = idx;
207
	evsel->tracking	   = !idx;
208
	evsel->attr	   = *attr;
209
	evsel->leader	   = evsel;
210 211
	evsel->unit	   = "";
	evsel->scale	   = 1.0;
212
	evsel->evlist	   = NULL;
213
	evsel->bpf_fd	   = -1;
214
	INIT_LIST_HEAD(&evsel->node);
215
	INIT_LIST_HEAD(&evsel->config_terms);
A
Arnaldo Carvalho de Melo 已提交
216
	perf_evsel__object.init(evsel);
217
	evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
218
	perf_evsel__calc_id_pos(evsel);
219
	evsel->cmdline_group_boundary = false;
220 221
}

222
struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
223
{
A
Arnaldo Carvalho de Melo 已提交
224
	struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
225

226 227
	if (evsel != NULL)
		perf_evsel__init(evsel, attr, idx);
228

229
	if (perf_evsel__is_bpf_output(evsel)) {
230 231
		evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
					    PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
232 233 234
		evsel->attr.sample_period = 1;
	}

235 236 237
	return evsel;
}

238 239 240
/*
 * Returns pointer with encoded error via <linux/err.h> interface.
 */
241
struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
242
{
A
Arnaldo Carvalho de Melo 已提交
243
	struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
244
	int err = -ENOMEM;
245

246 247 248
	if (evsel == NULL) {
		goto out_err;
	} else {
249
		struct perf_event_attr attr = {
250 251 252
			.type	       = PERF_TYPE_TRACEPOINT,
			.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
					  PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
253 254
		};

255 256 257
		if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
			goto out_free;

258
		evsel->tp_format = trace_event__tp_format(sys, name);
259 260
		if (IS_ERR(evsel->tp_format)) {
			err = PTR_ERR(evsel->tp_format);
261
			goto out_free;
262
		}
263

264
		event_attr_init(&attr);
265
		attr.config = evsel->tp_format->id;
266
		attr.sample_period = 1;
267 268 269 270 271 272
		perf_evsel__init(evsel, &attr, idx);
	}

	return evsel;

out_free:
273
	zfree(&evsel->name);
274
	free(evsel);
275 276
out_err:
	return ERR_PTR(err);
277 278
}

279
const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
280 281 282 283 284 285 286 287 288 289 290 291
	"cycles",
	"instructions",
	"cache-references",
	"cache-misses",
	"branches",
	"branch-misses",
	"bus-cycles",
	"stalled-cycles-frontend",
	"stalled-cycles-backend",
	"ref-cycles",
};

292
static const char *__perf_evsel__hw_name(u64 config)
293 294 295 296 297 298 299
{
	if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
		return perf_evsel__hw_names[config];

	return "unknown-hardware";
}

300
static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
301
{
302
	int colon = 0, r = 0;
303 304 305 306 307
	struct perf_event_attr *attr = &evsel->attr;
	bool exclude_guest_default = false;

#define MOD_PRINT(context, mod)	do {					\
		if (!attr->exclude_##context) {				\
308
			if (!colon) colon = ++r;			\
309 310 311 312 313 314 315 316 317 318 319 320
			r += scnprintf(bf + r, size - r, "%c", mod);	\
		} } while(0)

	if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
		MOD_PRINT(kernel, 'k');
		MOD_PRINT(user, 'u');
		MOD_PRINT(hv, 'h');
		exclude_guest_default = true;
	}

	if (attr->precise_ip) {
		if (!colon)
321
			colon = ++r;
322 323 324 325 326 327 328 329 330 331
		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
		exclude_guest_default = true;
	}

	if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
		MOD_PRINT(host, 'H');
		MOD_PRINT(guest, 'G');
	}
#undef MOD_PRINT
	if (colon)
332
		bf[colon - 1] = ':';
333 334 335
	return r;
}

336 337 338 339 340 341
static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
}

342
const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
343 344 345 346
	"cpu-clock",
	"task-clock",
	"page-faults",
	"context-switches",
347
	"cpu-migrations",
348 349 350 351
	"minor-faults",
	"major-faults",
	"alignment-faults",
	"emulation-faults",
352
	"dummy",
353 354
};

355
static const char *__perf_evsel__sw_name(u64 config)
356 357 358 359 360 361 362 363 364 365 366 367
{
	if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
		return perf_evsel__sw_names[config];
	return "unknown-software";
}

static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
}

368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392
static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
{
	int r;

	r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);

	if (type & HW_BREAKPOINT_R)
		r += scnprintf(bf + r, size - r, "r");

	if (type & HW_BREAKPOINT_W)
		r += scnprintf(bf + r, size - r, "w");

	if (type & HW_BREAKPOINT_X)
		r += scnprintf(bf + r, size - r, "x");

	return r;
}

static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	struct perf_event_attr *attr = &evsel->attr;
	int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
}

393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458
const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
				[PERF_EVSEL__MAX_ALIASES] = {
 { "L1-dcache",	"l1-d",		"l1d",		"L1-data",		},
 { "L1-icache",	"l1-i",		"l1i",		"L1-instruction",	},
 { "LLC",	"L2",							},
 { "dTLB",	"d-tlb",	"Data-TLB",				},
 { "iTLB",	"i-tlb",	"Instruction-TLB",			},
 { "branch",	"branches",	"bpu",		"btb",		"bpc",	},
 { "node",								},
};

const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
				   [PERF_EVSEL__MAX_ALIASES] = {
 { "load",	"loads",	"read",					},
 { "store",	"stores",	"write",				},
 { "prefetch",	"prefetches",	"speculative-read", "speculative-load",	},
};

const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
				       [PERF_EVSEL__MAX_ALIASES] = {
 { "refs",	"Reference",	"ops",		"access",		},
 { "misses",	"miss",							},
};

#define C(x)		PERF_COUNT_HW_CACHE_##x
#define CACHE_READ	(1 << C(OP_READ))
#define CACHE_WRITE	(1 << C(OP_WRITE))
#define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
#define COP(x)		(1 << x)

/*
 * cache operartion stat
 * L1I : Read and prefetch only
 * ITLB and BPU : Read-only
 */
static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
 [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
 [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 [C(ITLB)]	= (CACHE_READ),
 [C(BPU)]	= (CACHE_READ),
 [C(NODE)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
};

bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
{
	if (perf_evsel__hw_cache_stat[type] & COP(op))
		return true;	/* valid */
	else
		return false;	/* invalid */
}

int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
					    char *bf, size_t size)
{
	if (result) {
		return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
				 perf_evsel__hw_cache_op[op][0],
				 perf_evsel__hw_cache_result[result][0]);
	}

	return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
			 perf_evsel__hw_cache_op[op][1]);
}

459
static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
{
	u8 op, result, type = (config >>  0) & 0xff;
	const char *err = "unknown-ext-hardware-cache-type";

	if (type > PERF_COUNT_HW_CACHE_MAX)
		goto out_err;

	op = (config >>  8) & 0xff;
	err = "unknown-ext-hardware-cache-op";
	if (op > PERF_COUNT_HW_CACHE_OP_MAX)
		goto out_err;

	result = (config >> 16) & 0xff;
	err = "unknown-ext-hardware-cache-result";
	if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
		goto out_err;

	err = "invalid-cache";
	if (!perf_evsel__is_cache_op_valid(type, op))
		goto out_err;

	return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
out_err:
	return scnprintf(bf, size, "%s", err);
}

static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
	return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
}

492 493 494 495 496 497
static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
	return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
}

498
const char *perf_evsel__name(struct perf_evsel *evsel)
499
{
500
	char bf[128];
501

502 503
	if (evsel->name)
		return evsel->name;
504 505 506

	switch (evsel->attr.type) {
	case PERF_TYPE_RAW:
507
		perf_evsel__raw_name(evsel, bf, sizeof(bf));
508 509 510
		break;

	case PERF_TYPE_HARDWARE:
511
		perf_evsel__hw_name(evsel, bf, sizeof(bf));
512
		break;
513 514

	case PERF_TYPE_HW_CACHE:
515
		perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
516 517
		break;

518
	case PERF_TYPE_SOFTWARE:
519
		perf_evsel__sw_name(evsel, bf, sizeof(bf));
520 521
		break;

522
	case PERF_TYPE_TRACEPOINT:
523
		scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
524 525
		break;

526 527 528 529
	case PERF_TYPE_BREAKPOINT:
		perf_evsel__bp_name(evsel, bf, sizeof(bf));
		break;

530
	default:
531 532
		scnprintf(bf, sizeof(bf), "unknown attr type: %d",
			  evsel->attr.type);
533
		break;
534 535
	}

536 537 538
	evsel->name = strdup(bf);

	return evsel->name ?: "unknown";
539 540
}

541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565
const char *perf_evsel__group_name(struct perf_evsel *evsel)
{
	return evsel->group_name ?: "anon group";
}

int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
{
	int ret;
	struct perf_evsel *pos;
	const char *group_name = perf_evsel__group_name(evsel);

	ret = scnprintf(buf, size, "%s", group_name);

	ret += scnprintf(buf + ret, size - ret, " { %s",
			 perf_evsel__name(evsel));

	for_each_group_member(pos, evsel)
		ret += scnprintf(buf + ret, size - ret, ", %s",
				 perf_evsel__name(pos));

	ret += scnprintf(buf + ret, size - ret, " }");

	return ret;
}

566 567 568
void perf_evsel__config_callchain(struct perf_evsel *evsel,
				  struct record_opts *opts,
				  struct callchain_param *param)
569 570 571 572 573 574
{
	bool function = perf_evsel__is_function_event(evsel);
	struct perf_event_attr *attr = &evsel->attr;

	perf_evsel__set_sample_bit(evsel, CALLCHAIN);

575 576
	attr->sample_max_stack = param->max_stack;

577
	if (param->record_mode == CALLCHAIN_LBR) {
578 579 580 581 582 583 584 585
		if (!opts->branch_stack) {
			if (attr->exclude_user) {
				pr_warning("LBR callstack option is only available "
					   "to get user callchain information. "
					   "Falling back to framepointers.\n");
			} else {
				perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
				attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
586 587 588
							PERF_SAMPLE_BRANCH_CALL_STACK |
							PERF_SAMPLE_BRANCH_NO_CYCLES |
							PERF_SAMPLE_BRANCH_NO_FLAGS;
589 590 591 592 593 594
			}
		} else
			 pr_warning("Cannot use LBR callstack with branch stack. "
				    "Falling back to framepointers.\n");
	}

595
	if (param->record_mode == CALLCHAIN_DWARF) {
596 597 598 599
		if (!function) {
			perf_evsel__set_sample_bit(evsel, REGS_USER);
			perf_evsel__set_sample_bit(evsel, STACK_USER);
			attr->sample_regs_user = PERF_REGS_MASK;
600
			attr->sample_stack_user = param->dump_size;
601 602 603 604 605 606 607 608 609 610 611 612 613
			attr->exclude_callchain_user = 1;
		} else {
			pr_info("Cannot use DWARF unwind for function trace event,"
				" falling back to framepointers.\n");
		}
	}

	if (function) {
		pr_info("Disabling user space callchains for function trace event.\n");
		attr->exclude_callchain_user = 1;
	}
}

614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633
static void
perf_evsel__reset_callgraph(struct perf_evsel *evsel,
			    struct callchain_param *param)
{
	struct perf_event_attr *attr = &evsel->attr;

	perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
	if (param->record_mode == CALLCHAIN_LBR) {
		perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
		attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
					      PERF_SAMPLE_BRANCH_CALL_STACK);
	}
	if (param->record_mode == CALLCHAIN_DWARF) {
		perf_evsel__reset_sample_bit(evsel, REGS_USER);
		perf_evsel__reset_sample_bit(evsel, STACK_USER);
	}
}

static void apply_config_terms(struct perf_evsel *evsel,
			       struct record_opts *opts)
634 635
{
	struct perf_evsel_config_term *term;
K
Kan Liang 已提交
636 637
	struct list_head *config_terms = &evsel->config_terms;
	struct perf_event_attr *attr = &evsel->attr;
638 639
	struct callchain_param param;
	u32 dump_size = 0;
640 641
	int max_stack = 0;
	const char *callgraph_buf = NULL;
642 643 644

	/* callgraph default */
	param.record_mode = callchain_param.record_mode;
645 646 647

	list_for_each_entry(term, config_terms, list) {
		switch (term->type) {
648 649
		case PERF_EVSEL__CONFIG_TERM_PERIOD:
			attr->sample_period = term->val.period;
650
			attr->freq = 0;
K
Kan Liang 已提交
651
			break;
652 653 654 655
		case PERF_EVSEL__CONFIG_TERM_FREQ:
			attr->sample_freq = term->val.freq;
			attr->freq = 1;
			break;
K
Kan Liang 已提交
656 657 658 659 660 661
		case PERF_EVSEL__CONFIG_TERM_TIME:
			if (term->val.time)
				perf_evsel__set_sample_bit(evsel, TIME);
			else
				perf_evsel__reset_sample_bit(evsel, TIME);
			break;
662 663 664 665 666 667
		case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
			callgraph_buf = term->val.callgraph;
			break;
		case PERF_EVSEL__CONFIG_TERM_STACK_USER:
			dump_size = term->val.stack_user;
			break;
668 669 670
		case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
			max_stack = term->val.max_stack;
			break;
671 672 673 674 675 676 677 678 679
		case PERF_EVSEL__CONFIG_TERM_INHERIT:
			/*
			 * attr->inherit should has already been set by
			 * perf_evsel__config. If user explicitly set
			 * inherit using config terms, override global
			 * opt->no_inherit setting.
			 */
			attr->inherit = term->val.inherit ? 1 : 0;
			break;
680 681 682 683
		default:
			break;
		}
	}
684 685

	/* User explicitly set per-event callgraph, clear the old setting and reset. */
686 687 688 689 690 691
	if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
		if (max_stack) {
			param.max_stack = max_stack;
			if (callgraph_buf == NULL)
				callgraph_buf = "fp";
		}
692 693 694

		/* parse callgraph parameters */
		if (callgraph_buf != NULL) {
695 696 697 698 699 700 701 702 703 704 705
			if (!strcmp(callgraph_buf, "no")) {
				param.enabled = false;
				param.record_mode = CALLCHAIN_NONE;
			} else {
				param.enabled = true;
				if (parse_callchain_record(callgraph_buf, &param)) {
					pr_err("per-event callgraph setting for %s failed. "
					       "Apply callgraph global setting for it\n",
					       evsel->name);
					return;
				}
706 707 708 709 710 711 712 713 714 715 716 717 718
			}
		}
		if (dump_size > 0) {
			dump_size = round_up(dump_size, sizeof(u64));
			param.dump_size = dump_size;
		}

		/* If global callgraph set, clear it */
		if (callchain_param.enabled)
			perf_evsel__reset_callgraph(evsel, &callchain_param);

		/* set perf-event callgraph */
		if (param.enabled)
719
			perf_evsel__config_callchain(evsel, opts, &param);
720
	}
721 722
}

723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
/*
 * The enable_on_exec/disabled value strategy:
 *
 *  1) For any type of traced program:
 *    - all independent events and group leaders are disabled
 *    - all group members are enabled
 *
 *     Group members are ruled by group leaders. They need to
 *     be enabled, because the group scheduling relies on that.
 *
 *  2) For traced programs executed by perf:
 *     - all independent events and group leaders have
 *       enable_on_exec set
 *     - we don't specifically enable or disable any event during
 *       the record command
 *
 *     Independent events and group leaders are initially disabled
 *     and get enabled by exec. Group members are ruled by group
 *     leaders as stated in 1).
 *
 *  3) For traced programs attached by perf (pid/tid):
 *     - we specifically enable or disable all events during
 *       the record command
 *
 *     When attaching events to already running traced we
 *     enable/disable events specifically, as there's no
 *     initial traced exec call.
 */
751 752
void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
			struct callchain_param *callchain)
753
{
754
	struct perf_evsel *leader = evsel->leader;
755
	struct perf_event_attr *attr = &evsel->attr;
756
	int track = evsel->tracking;
757
	bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
758

759
	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
760 761
	attr->inherit	    = !opts->no_inherit;

762 763
	perf_evsel__set_sample_bit(evsel, IP);
	perf_evsel__set_sample_bit(evsel, TID);
764

765 766 767 768 769 770 771
	if (evsel->sample_read) {
		perf_evsel__set_sample_bit(evsel, READ);

		/*
		 * We need ID even in case of single event, because
		 * PERF_SAMPLE_READ process ID specific data.
		 */
772
		perf_evsel__set_sample_id(evsel, false);
773 774 775 776 777 778 779 780 781 782 783

		/*
		 * Apply group format only if we belong to group
		 * with more than one members.
		 */
		if (leader->nr_members > 1) {
			attr->read_format |= PERF_FORMAT_GROUP;
			attr->inherit = 0;
		}
	}

784
	/*
785
	 * We default some events to have a default interval. But keep
786 787
	 * it a weak assumption overridable by the user.
	 */
788
	if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
789 790
				     opts->user_interval != ULLONG_MAX)) {
		if (opts->freq) {
791
			perf_evsel__set_sample_bit(evsel, PERIOD);
792 793 794 795 796 797 798
			attr->freq		= 1;
			attr->sample_freq	= opts->freq;
		} else {
			attr->sample_period = opts->default_interval;
		}
	}

799 800 801 802 803 804 805 806 807
	/*
	 * Disable sampling for all group members other
	 * than leader in case leader 'leads' the sampling.
	 */
	if ((leader != evsel) && leader->sample_read) {
		attr->sample_freq   = 0;
		attr->sample_period = 0;
	}

808 809 810 811 812 813 814
	if (opts->no_samples)
		attr->sample_freq = 0;

	if (opts->inherit_stat)
		attr->inherit_stat = 1;

	if (opts->sample_address) {
815
		perf_evsel__set_sample_bit(evsel, ADDR);
816 817 818
		attr->mmap_data = track;
	}

819 820 821 822 823 824 825 826
	/*
	 * We don't allow user space callchains for  function trace
	 * event, due to issues with page faults while tracing page
	 * fault handler and its overall trickiness nature.
	 */
	if (perf_evsel__is_function_event(evsel))
		evsel->attr.exclude_callchain_user = 1;

827
	if (callchain && callchain->enabled && !evsel->no_aux_samples)
828
		perf_evsel__config_callchain(evsel, opts, callchain);
829

830
	if (opts->sample_intr_regs) {
831
		attr->sample_regs_intr = opts->sample_intr_regs;
832 833 834
		perf_evsel__set_sample_bit(evsel, REGS_INTR);
	}

835
	if (target__has_cpu(&opts->target))
836
		perf_evsel__set_sample_bit(evsel, CPU);
837

838
	if (opts->period)
839
		perf_evsel__set_sample_bit(evsel, PERIOD);
840

841
	/*
842
	 * When the user explicitly disabled time don't force it here.
843 844 845
	 */
	if (opts->sample_time &&
	    (!perf_missing_features.sample_id_all &&
846 847
	    (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
	     opts->sample_time_set)))
848
		perf_evsel__set_sample_bit(evsel, TIME);
849

850
	if (opts->raw_samples && !evsel->no_aux_samples) {
851 852 853
		perf_evsel__set_sample_bit(evsel, TIME);
		perf_evsel__set_sample_bit(evsel, RAW);
		perf_evsel__set_sample_bit(evsel, CPU);
854 855
	}

856
	if (opts->sample_address)
857
		perf_evsel__set_sample_bit(evsel, DATA_SRC);
858

859
	if (opts->no_buffering) {
860 861 862
		attr->watermark = 0;
		attr->wakeup_events = 1;
	}
863
	if (opts->branch_stack && !evsel->no_aux_samples) {
864
		perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
865 866
		attr->branch_sample_type = opts->branch_stack;
	}
867

868
	if (opts->sample_weight)
869
		perf_evsel__set_sample_bit(evsel, WEIGHT);
870

871
	attr->task  = track;
872
	attr->mmap  = track;
873
	attr->mmap2 = track && !perf_missing_features.mmap2;
874
	attr->comm  = track;
875

876 877 878
	if (opts->record_switch_events)
		attr->context_switch = track;

879
	if (opts->sample_transaction)
880
		perf_evsel__set_sample_bit(evsel, TRANSACTION);
881

882 883 884 885 886 887
	if (opts->running_time) {
		evsel->attr.read_format |=
			PERF_FORMAT_TOTAL_TIME_ENABLED |
			PERF_FORMAT_TOTAL_TIME_RUNNING;
	}

888 889 890 891 892 893
	/*
	 * XXX see the function comment above
	 *
	 * Disabling only independent events or group leaders,
	 * keeping group members enabled.
	 */
894
	if (perf_evsel__is_group_leader(evsel))
895 896 897 898 899 900
		attr->disabled = 1;

	/*
	 * Setting enable_on_exec for independent events and
	 * group leaders for traced executed by perf.
	 */
901 902
	if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
		!opts->initial_delay)
903
		attr->enable_on_exec = 1;
904 905 906 907 908

	if (evsel->immediate) {
		attr->disabled = 0;
		attr->enable_on_exec = 0;
	}
909 910 911 912 913 914

	clockid = opts->clockid;
	if (opts->use_clockid) {
		attr->use_clockid = 1;
		attr->clockid = opts->clockid;
	}
915

916 917 918
	if (evsel->precise_max)
		perf_event_attr__set_max_precise_ip(attr);

919 920 921 922 923 924 925 926 927 928
	if (opts->all_user) {
		attr->exclude_kernel = 1;
		attr->exclude_user   = 0;
	}

	if (opts->all_kernel) {
		attr->exclude_kernel = 0;
		attr->exclude_user   = 1;
	}

929 930 931 932
	/*
	 * Apply event specific term settings,
	 * it overloads any global configuration.
	 */
933
	apply_config_terms(evsel, opts);
934 935
}

936
static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
937
{
938
	int cpu, thread;
939 940 941 942

	if (evsel->system_wide)
		nthreads = 1;

943
	evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
944 945 946 947 948 949 950 951 952

	if (evsel->fd) {
		for (cpu = 0; cpu < ncpus; cpu++) {
			for (thread = 0; thread < nthreads; thread++) {
				FD(evsel, cpu, thread) = -1;
			}
		}
	}

953 954 955
	return evsel->fd != NULL ? 0 : -ENOMEM;
}

956 957
static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
			  int ioc,  void *arg)
958 959 960
{
	int cpu, thread;

961 962 963
	if (evsel->system_wide)
		nthreads = 1;

964 965 966
	for (cpu = 0; cpu < ncpus; cpu++) {
		for (thread = 0; thread < nthreads; thread++) {
			int fd = FD(evsel, cpu, thread),
967
			    err = ioctl(fd, ioc, arg);
968 969 970 971 972 973 974 975 976

			if (err)
				return err;
		}
	}

	return 0;
}

977 978
int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
			     const char *filter)
979 980 981 982 983 984
{
	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
				     PERF_EVENT_IOC_SET_FILTER,
				     (void *)filter);
}

985 986 987 988 989 990 991 992 993 994 995 996 997
int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
{
	char *new_filter = strdup(filter);

	if (new_filter != NULL) {
		free(evsel->filter);
		evsel->filter = new_filter;
		return 0;
	}

	return -1;
}

998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
int perf_evsel__append_filter(struct perf_evsel *evsel,
			      const char *op, const char *filter)
{
	char *new_filter;

	if (evsel->filter == NULL)
		return perf_evsel__set_filter(evsel, filter);

	if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
		free(evsel->filter);
		evsel->filter = new_filter;
		return 0;
	}

	return -1;
}

1015
int perf_evsel__enable(struct perf_evsel *evsel)
1016
{
1017 1018 1019
	int nthreads = thread_map__nr(evsel->threads);
	int ncpus = cpu_map__nr(evsel->cpus);

1020 1021 1022 1023 1024
	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
				     PERF_EVENT_IOC_ENABLE,
				     0);
}

J
Jiri Olsa 已提交
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
int perf_evsel__disable(struct perf_evsel *evsel)
{
	int nthreads = thread_map__nr(evsel->threads);
	int ncpus = cpu_map__nr(evsel->cpus);

	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
				     PERF_EVENT_IOC_DISABLE,
				     0);
}

1035 1036
int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
{
1037 1038 1039
	if (ncpus == 0 || nthreads == 0)
		return 0;

1040 1041 1042
	if (evsel->system_wide)
		nthreads = 1;

1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
	evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
	if (evsel->sample_id == NULL)
		return -ENOMEM;

	evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
	if (evsel->id == NULL) {
		xyarray__delete(evsel->sample_id);
		evsel->sample_id = NULL;
		return -ENOMEM;
	}

	return 0;
1055 1056
}

1057
static void perf_evsel__free_fd(struct perf_evsel *evsel)
1058 1059 1060 1061 1062
{
	xyarray__delete(evsel->fd);
	evsel->fd = NULL;
}

1063
static void perf_evsel__free_id(struct perf_evsel *evsel)
1064
{
1065 1066
	xyarray__delete(evsel->sample_id);
	evsel->sample_id = NULL;
1067
	zfree(&evsel->id);
1068 1069
}

1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
{
	struct perf_evsel_config_term *term, *h;

	list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
		list_del(&term->list);
		free(term);
	}
}

1080 1081 1082 1083
void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
{
	int cpu, thread;

1084 1085 1086
	if (evsel->system_wide)
		nthreads = 1;

1087 1088 1089 1090 1091 1092 1093
	for (cpu = 0; cpu < ncpus; cpu++)
		for (thread = 0; thread < nthreads; ++thread) {
			close(FD(evsel, cpu, thread));
			FD(evsel, cpu, thread) = -1;
		}
}

1094
void perf_evsel__exit(struct perf_evsel *evsel)
1095 1096
{
	assert(list_empty(&evsel->node));
1097
	assert(evsel->evlist == NULL);
1098 1099
	perf_evsel__free_fd(evsel);
	perf_evsel__free_id(evsel);
1100
	perf_evsel__free_config_terms(evsel);
1101
	close_cgroup(evsel->cgrp);
1102
	cpu_map__put(evsel->cpus);
A
Adrian Hunter 已提交
1103
	cpu_map__put(evsel->own_cpus);
1104
	thread_map__put(evsel->threads);
1105 1106
	zfree(&evsel->group_name);
	zfree(&evsel->name);
A
Arnaldo Carvalho de Melo 已提交
1107
	perf_evsel__object.fini(evsel);
1108 1109 1110 1111 1112
}

void perf_evsel__delete(struct perf_evsel *evsel)
{
	perf_evsel__exit(evsel);
1113 1114
	free(evsel);
}
1115

1116
void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1117
				struct perf_counts_values *count)
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
{
	struct perf_counts_values tmp;

	if (!evsel->prev_raw_counts)
		return;

	if (cpu == -1) {
		tmp = evsel->prev_raw_counts->aggr;
		evsel->prev_raw_counts->aggr = *count;
	} else {
1128 1129
		tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
		*perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1130 1131 1132 1133 1134 1135 1136
	}

	count->val = count->val - tmp.val;
	count->ena = count->ena - tmp.ena;
	count->run = count->run - tmp.run;
}

1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
void perf_counts_values__scale(struct perf_counts_values *count,
			       bool scale, s8 *pscaled)
{
	s8 scaled = 0;

	if (scale) {
		if (count->run == 0) {
			scaled = -1;
			count->val = 0;
		} else if (count->run < count->ena) {
			scaled = 1;
			count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
		}
	} else
		count->ena = count->run = 0;

	if (pscaled)
		*pscaled = scaled;
}

1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
		     struct perf_counts_values *count)
{
	memset(count, 0, sizeof(*count));

	if (FD(evsel, cpu, thread) < 0)
		return -EINVAL;

	if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
		return -errno;

	return 0;
}

1171 1172 1173 1174 1175 1176 1177 1178 1179
int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
			      int cpu, int thread, bool scale)
{
	struct perf_counts_values count;
	size_t nv = scale ? 3 : 1;

	if (FD(evsel, cpu, thread) < 0)
		return -EINVAL;

1180
	if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1181 1182
		return -ENOMEM;

1183 1184 1185
	if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
		return -errno;

1186
	perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1187
	perf_counts_values__scale(&count, scale, NULL);
1188
	*perf_counts(evsel->counts, cpu, thread) = count;
1189 1190 1191
	return 0;
}

1192 1193 1194 1195 1196
static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
{
	struct perf_evsel *leader = evsel->leader;
	int fd;

1197
	if (perf_evsel__is_group_leader(evsel))
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
		return -1;

	/*
	 * Leader must be already processed/open,
	 * if not it's a bug.
	 */
	BUG_ON(!leader->fd);

	fd = FD(leader, cpu, thread);
	BUG_ON(fd == -1);

	return fd;
}

1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
struct bit_names {
	int bit;
	const char *name;
};

static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
{
	bool first_bit = true;
	int i = 0;

	do {
		if (value & bits[i].bit) {
			buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
			first_bit = false;
		}
	} while (bits[++i].name != NULL);
}

static void __p_sample_type(char *buf, size_t size, u64 value)
{
#define bit_name(n) { PERF_SAMPLE_##n, #n }
	struct bit_names bits[] = {
		bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
		bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
		bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
		bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1238
		bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1239
		bit_name(WEIGHT),
1240 1241 1242 1243 1244 1245
		{ .name = NULL, }
	};
#undef bit_name
	__p_bits(buf, size, value, bits);
}

1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
static void __p_branch_sample_type(char *buf, size_t size, u64 value)
{
#define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
	struct bit_names bits[] = {
		bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
		bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
		bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
		bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
		bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
		{ .name = NULL, }
	};
#undef bit_name
	__p_bits(buf, size, value, bits);
}

1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
static void __p_read_format(char *buf, size_t size, u64 value)
{
#define bit_name(n) { PERF_FORMAT_##n, #n }
	struct bit_names bits[] = {
		bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
		bit_name(ID), bit_name(GROUP),
		{ .name = NULL, }
	};
#undef bit_name
	__p_bits(buf, size, value, bits);
}

#define BUF_SIZE		1024

1275
#define p_hex(val)		snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1276 1277 1278
#define p_unsigned(val)		snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
#define p_signed(val)		snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
#define p_sample_type(val)	__p_sample_type(buf, BUF_SIZE, val)
1279
#define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
#define p_read_format(val)	__p_read_format(buf, BUF_SIZE, val)

#define PRINT_ATTRn(_n, _f, _p)				\
do {							\
	if (attr->_f) {					\
		_p(attr->_f);				\
		ret += attr__fprintf(fp, _n, buf, priv);\
	}						\
} while (0)

#define PRINT_ATTRf(_f, _p)	PRINT_ATTRn(#_f, _f, _p)

int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
			     attr__fprintf_f attr__fprintf, void *priv)
{
	char buf[BUF_SIZE];
	int ret = 0;

	PRINT_ATTRf(type, p_unsigned);
	PRINT_ATTRf(size, p_unsigned);
	PRINT_ATTRf(config, p_hex);
	PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
	PRINT_ATTRf(sample_type, p_sample_type);
	PRINT_ATTRf(read_format, p_read_format);

	PRINT_ATTRf(disabled, p_unsigned);
	PRINT_ATTRf(inherit, p_unsigned);
	PRINT_ATTRf(pinned, p_unsigned);
	PRINT_ATTRf(exclusive, p_unsigned);
	PRINT_ATTRf(exclude_user, p_unsigned);
	PRINT_ATTRf(exclude_kernel, p_unsigned);
	PRINT_ATTRf(exclude_hv, p_unsigned);
	PRINT_ATTRf(exclude_idle, p_unsigned);
	PRINT_ATTRf(mmap, p_unsigned);
	PRINT_ATTRf(comm, p_unsigned);
	PRINT_ATTRf(freq, p_unsigned);
	PRINT_ATTRf(inherit_stat, p_unsigned);
	PRINT_ATTRf(enable_on_exec, p_unsigned);
	PRINT_ATTRf(task, p_unsigned);
	PRINT_ATTRf(watermark, p_unsigned);
	PRINT_ATTRf(precise_ip, p_unsigned);
	PRINT_ATTRf(mmap_data, p_unsigned);
	PRINT_ATTRf(sample_id_all, p_unsigned);
	PRINT_ATTRf(exclude_host, p_unsigned);
	PRINT_ATTRf(exclude_guest, p_unsigned);
	PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
	PRINT_ATTRf(exclude_callchain_user, p_unsigned);
	PRINT_ATTRf(mmap2, p_unsigned);
	PRINT_ATTRf(comm_exec, p_unsigned);
	PRINT_ATTRf(use_clockid, p_unsigned);
1330
	PRINT_ATTRf(context_switch, p_unsigned);
1331
	PRINT_ATTRf(write_backward, p_unsigned);
1332 1333 1334 1335 1336

	PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
	PRINT_ATTRf(bp_type, p_unsigned);
	PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
	PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1337
	PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1338 1339 1340 1341
	PRINT_ATTRf(sample_regs_user, p_hex);
	PRINT_ATTRf(sample_stack_user, p_unsigned);
	PRINT_ATTRf(clockid, p_signed);
	PRINT_ATTRf(sample_regs_intr, p_hex);
1342
	PRINT_ATTRf(aux_watermark, p_unsigned);
1343
	PRINT_ATTRf(sample_max_stack, p_unsigned);
A
Adrian Hunter 已提交
1344 1345 1346 1347

	return ret;
}

1348 1349 1350 1351 1352 1353
static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
				void *priv __attribute__((unused)))
{
	return fprintf(fp, "  %-32s %s\n", name, val);
}

1354
static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1355
			      struct thread_map *threads)
1356
{
1357
	int cpu, thread, nthreads;
1358
	unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1359
	int pid = -1, err;
1360
	enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1361

1362 1363 1364 1365 1366
	if (evsel->system_wide)
		nthreads = 1;
	else
		nthreads = threads->nr;

1367
	if (evsel->fd == NULL &&
1368
	    perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1369
		return -ENOMEM;
1370

S
Stephane Eranian 已提交
1371
	if (evsel->cgrp) {
1372
		flags |= PERF_FLAG_PID_CGROUP;
S
Stephane Eranian 已提交
1373 1374 1375
		pid = evsel->cgrp->fd;
	}

1376
fallback_missing_features:
1377 1378 1379 1380 1381 1382
	if (perf_missing_features.clockid_wrong)
		evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
	if (perf_missing_features.clockid) {
		evsel->attr.use_clockid = 0;
		evsel->attr.clockid = 0;
	}
1383 1384
	if (perf_missing_features.cloexec)
		flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1385 1386
	if (perf_missing_features.mmap2)
		evsel->attr.mmap2 = 0;
1387 1388
	if (perf_missing_features.exclude_guest)
		evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1389 1390 1391
	if (perf_missing_features.lbr_flags)
		evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
				     PERF_SAMPLE_BRANCH_NO_CYCLES);
1392 1393
	if (perf_missing_features.write_backward)
		evsel->attr.write_backward = false;
1394 1395 1396 1397
retry_sample_id:
	if (perf_missing_features.sample_id_all)
		evsel->attr.sample_id_all = 0;

1398 1399 1400 1401 1402 1403
	if (verbose >= 2) {
		fprintf(stderr, "%.60s\n", graph_dotted_line);
		fprintf(stderr, "perf_event_attr:\n");
		perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
		fprintf(stderr, "%.60s\n", graph_dotted_line);
	}
A
Adrian Hunter 已提交
1404

1405
	for (cpu = 0; cpu < cpus->nr; cpu++) {
1406

1407
		for (thread = 0; thread < nthreads; thread++) {
1408
			int group_fd;
S
Stephane Eranian 已提交
1409

1410
			if (!evsel->cgrp && !evsel->system_wide)
1411
				pid = thread_map__pid(threads, thread);
S
Stephane Eranian 已提交
1412

1413
			group_fd = get_group_fd(evsel, cpu, thread);
1414
retry_open:
1415
			pr_debug2("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx\n",
A
Adrian Hunter 已提交
1416 1417
				  pid, cpus->map[cpu], group_fd, flags);

1418
			FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
S
Stephane Eranian 已提交
1419
								     pid,
1420
								     cpus->map[cpu],
S
Stephane Eranian 已提交
1421
								     group_fd, flags);
1422 1423
			if (FD(evsel, cpu, thread) < 0) {
				err = -errno;
1424
				pr_debug2("sys_perf_event_open failed, error %d\n",
1425
					  err);
1426
				goto try_fallback;
1427
			}
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443

			if (evsel->bpf_fd >= 0) {
				int evt_fd = FD(evsel, cpu, thread);
				int bpf_fd = evsel->bpf_fd;

				err = ioctl(evt_fd,
					    PERF_EVENT_IOC_SET_BPF,
					    bpf_fd);
				if (err && errno != EEXIST) {
					pr_err("failed to attach bpf fd %d: %s\n",
					       bpf_fd, strerror(errno));
					err = -EINVAL;
					goto out_close;
				}
			}

1444
			set_rlimit = NO_CHANGE;
1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455

			/*
			 * If we succeeded but had to kill clockid, fail and
			 * have perf_evsel__open_strerror() print us a nice
			 * error.
			 */
			if (perf_missing_features.clockid ||
			    perf_missing_features.clockid_wrong) {
				err = -EINVAL;
				goto out_close;
			}
1456 1457 1458 1459 1460 1461

			if (evsel->overwrite &&
			    perf_missing_features.write_backward) {
				err = -EINVAL;
				goto out_close;
			}
1462
		}
1463 1464 1465 1466
	}

	return 0;

1467
try_fallback:
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491
	/*
	 * perf stat needs between 5 and 22 fds per CPU. When we run out
	 * of them try to increase the limits.
	 */
	if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
		struct rlimit l;
		int old_errno = errno;

		if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
			if (set_rlimit == NO_CHANGE)
				l.rlim_cur = l.rlim_max;
			else {
				l.rlim_cur = l.rlim_max + 1000;
				l.rlim_max = l.rlim_cur;
			}
			if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
				set_rlimit++;
				errno = old_errno;
				goto retry_open;
			}
		}
		errno = old_errno;
	}

1492 1493 1494
	if (err != -EINVAL || cpu > 0 || thread > 0)
		goto out_close;

1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
	/*
	 * Must probe features in the order they were added to the
	 * perf_event_attr interface.
	 */
	if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
		perf_missing_features.clockid_wrong = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
		perf_missing_features.clockid = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1506 1507 1508
		perf_missing_features.cloexec = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1509 1510 1511 1512
		perf_missing_features.mmap2 = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.exclude_guest &&
		   (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1513 1514 1515 1516 1517
		perf_missing_features.exclude_guest = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.sample_id_all) {
		perf_missing_features.sample_id_all = true;
		goto retry_sample_id;
1518 1519 1520 1521 1522 1523
	} else if (!perf_missing_features.lbr_flags &&
			(evsel->attr.branch_sample_type &
			 (PERF_SAMPLE_BRANCH_NO_CYCLES |
			  PERF_SAMPLE_BRANCH_NO_FLAGS))) {
		perf_missing_features.lbr_flags = true;
		goto fallback_missing_features;
1524 1525 1526 1527
	} else if (!perf_missing_features.write_backward &&
			evsel->attr.write_backward) {
		perf_missing_features.write_backward = true;
		goto fallback_missing_features;
1528 1529
	}

1530
out_close:
1531 1532 1533 1534 1535
	do {
		while (--thread >= 0) {
			close(FD(evsel, cpu, thread));
			FD(evsel, cpu, thread) = -1;
		}
1536
		thread = nthreads;
1537
	} while (--cpu >= 0);
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
	return err;
}

void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
{
	if (evsel->fd == NULL)
		return;

	perf_evsel__close_fd(evsel, ncpus, nthreads);
	perf_evsel__free_fd(evsel);
1548 1549
}

1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
static struct {
	struct cpu_map map;
	int cpus[1];
} empty_cpu_map = {
	.map.nr	= 1,
	.cpus	= { -1, },
};

static struct {
	struct thread_map map;
	int threads[1];
} empty_thread_map = {
	.map.nr	 = 1,
	.threads = { -1, },
};

1566
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1567
		     struct thread_map *threads)
1568
{
1569 1570 1571
	if (cpus == NULL) {
		/* Work around old compiler warnings about strict aliasing */
		cpus = &empty_cpu_map.map;
1572 1573
	}

1574 1575
	if (threads == NULL)
		threads = &empty_thread_map.map;
1576

1577
	return __perf_evsel__open(evsel, cpus, threads);
1578 1579
}

1580
int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1581
			     struct cpu_map *cpus)
1582
{
1583
	return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1584
}
1585

1586
int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1587
				struct thread_map *threads)
1588
{
1589
	return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1590
}
1591

1592 1593 1594
static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
				       const union perf_event *event,
				       struct perf_sample *sample)
1595
{
1596
	u64 type = evsel->attr.sample_type;
1597
	const u64 *array = event->sample.array;
1598
	bool swapped = evsel->needs_swap;
1599
	union u64_swap u;
1600 1601 1602 1603

	array += ((event->header.size -
		   sizeof(event->header)) / sizeof(u64)) - 1;

1604 1605 1606 1607 1608
	if (type & PERF_SAMPLE_IDENTIFIER) {
		sample->id = *array;
		array--;
	}

1609
	if (type & PERF_SAMPLE_CPU) {
1610 1611 1612 1613 1614 1615 1616 1617
		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
		}

		sample->cpu = u.val32[0];
1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
		array--;
	}

	if (type & PERF_SAMPLE_STREAM_ID) {
		sample->stream_id = *array;
		array--;
	}

	if (type & PERF_SAMPLE_ID) {
		sample->id = *array;
		array--;
	}

	if (type & PERF_SAMPLE_TIME) {
		sample->time = *array;
		array--;
	}

	if (type & PERF_SAMPLE_TID) {
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
		}

		sample->pid = u.val32[0];
		sample->tid = u.val32[1];
1647
		array--;
1648 1649 1650 1651 1652
	}

	return 0;
}

1653 1654
static inline bool overflow(const void *endp, u16 max_size, const void *offset,
			    u64 size)
1655
{
1656 1657
	return size > max_size || offset + size > endp;
}
1658

1659 1660 1661 1662 1663
#define OVERFLOW_CHECK(offset, size, max_size)				\
	do {								\
		if (overflow(endp, (max_size), (offset), (size)))	\
			return -EFAULT;					\
	} while (0)
1664

1665 1666
#define OVERFLOW_CHECK_u64(offset) \
	OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1667

1668
int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1669
			     struct perf_sample *data)
1670
{
1671
	u64 type = evsel->attr.sample_type;
1672
	bool swapped = evsel->needs_swap;
1673
	const u64 *array;
1674 1675 1676
	u16 max_size = event->header.size;
	const void *endp = (void *)event + max_size;
	u64 sz;
1677

1678 1679 1680 1681
	/*
	 * used for cross-endian analysis. See git commit 65014ab3
	 * for why this goofiness is needed.
	 */
1682
	union u64_swap u;
1683

1684
	memset(data, 0, sizeof(*data));
1685 1686
	data->cpu = data->pid = data->tid = -1;
	data->stream_id = data->id = data->time = -1ULL;
1687
	data->period = evsel->attr.sample_period;
1688
	data->weight = 0;
1689
	data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1690 1691

	if (event->header.type != PERF_RECORD_SAMPLE) {
1692
		if (!evsel->attr.sample_id_all)
1693
			return 0;
1694
		return perf_evsel__parse_id_sample(evsel, event, data);
1695 1696 1697 1698
	}

	array = event->sample.array;

1699 1700 1701 1702 1703
	/*
	 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
	 * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
	 * check the format does not go past the end of the event.
	 */
1704
	if (evsel->sample_size + sizeof(event->header) > event->header.size)
1705 1706
		return -EFAULT;

1707 1708 1709 1710 1711 1712
	data->id = -1ULL;
	if (type & PERF_SAMPLE_IDENTIFIER) {
		data->id = *array;
		array++;
	}

1713
	if (type & PERF_SAMPLE_IP) {
1714
		data->ip = *array;
1715 1716 1717 1718
		array++;
	}

	if (type & PERF_SAMPLE_TID) {
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
		}

		data->pid = u.val32[0];
		data->tid = u.val32[1];
1729 1730 1731 1732 1733 1734 1735 1736
		array++;
	}

	if (type & PERF_SAMPLE_TIME) {
		data->time = *array;
		array++;
	}

1737
	data->addr = 0;
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
	if (type & PERF_SAMPLE_ADDR) {
		data->addr = *array;
		array++;
	}

	if (type & PERF_SAMPLE_ID) {
		data->id = *array;
		array++;
	}

	if (type & PERF_SAMPLE_STREAM_ID) {
		data->stream_id = *array;
		array++;
	}

	if (type & PERF_SAMPLE_CPU) {
1754 1755 1756 1757 1758 1759 1760 1761 1762

		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
		}

		data->cpu = u.val32[0];
1763 1764 1765 1766 1767 1768 1769 1770 1771
		array++;
	}

	if (type & PERF_SAMPLE_PERIOD) {
		data->period = *array;
		array++;
	}

	if (type & PERF_SAMPLE_READ) {
1772 1773
		u64 read_format = evsel->attr.read_format;

1774
		OVERFLOW_CHECK_u64(array);
1775 1776 1777 1778 1779 1780 1781 1782
		if (read_format & PERF_FORMAT_GROUP)
			data->read.group.nr = *array;
		else
			data->read.one.value = *array;

		array++;

		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1783
			OVERFLOW_CHECK_u64(array);
1784 1785 1786 1787 1788
			data->read.time_enabled = *array;
			array++;
		}

		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1789
			OVERFLOW_CHECK_u64(array);
1790 1791 1792 1793 1794 1795
			data->read.time_running = *array;
			array++;
		}

		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
		if (read_format & PERF_FORMAT_GROUP) {
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
			const u64 max_group_nr = UINT64_MAX /
					sizeof(struct sample_read_value);

			if (data->read.group.nr > max_group_nr)
				return -EFAULT;
			sz = data->read.group.nr *
			     sizeof(struct sample_read_value);
			OVERFLOW_CHECK(array, sz, max_size);
			data->read.group.values =
					(struct sample_read_value *)array;
			array = (void *)array + sz;
1807
		} else {
1808
			OVERFLOW_CHECK_u64(array);
1809 1810 1811
			data->read.one.id = *array;
			array++;
		}
1812 1813 1814
	}

	if (type & PERF_SAMPLE_CALLCHAIN) {
1815
		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1816

1817 1818 1819
		OVERFLOW_CHECK_u64(array);
		data->callchain = (struct ip_callchain *)array++;
		if (data->callchain->nr > max_callchain_nr)
1820
			return -EFAULT;
1821 1822 1823
		sz = data->callchain->nr * sizeof(u64);
		OVERFLOW_CHECK(array, sz, max_size);
		array = (void *)array + sz;
1824 1825 1826
	}

	if (type & PERF_SAMPLE_RAW) {
1827
		OVERFLOW_CHECK_u64(array);
1828 1829 1830 1831 1832 1833 1834 1835 1836
		u.val64 = *array;
		if (WARN_ONCE(swapped,
			      "Endianness of raw data not corrected!\n")) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
		}
		data->raw_size = u.val32[0];
1837
		array = (void *)array + sizeof(u32);
1838

1839 1840 1841
		OVERFLOW_CHECK(array, data->raw_size, max_size);
		data->raw_data = (void *)array;
		array = (void *)array + data->raw_size;
1842 1843
	}

1844
	if (type & PERF_SAMPLE_BRANCH_STACK) {
1845 1846
		const u64 max_branch_nr = UINT64_MAX /
					  sizeof(struct branch_entry);
1847

1848 1849
		OVERFLOW_CHECK_u64(array);
		data->branch_stack = (struct branch_stack *)array++;
1850

1851 1852
		if (data->branch_stack->nr > max_branch_nr)
			return -EFAULT;
1853
		sz = data->branch_stack->nr * sizeof(struct branch_entry);
1854 1855
		OVERFLOW_CHECK(array, sz, max_size);
		array = (void *)array + sz;
1856
	}
1857 1858

	if (type & PERF_SAMPLE_REGS_USER) {
1859
		OVERFLOW_CHECK_u64(array);
1860 1861
		data->user_regs.abi = *array;
		array++;
1862

1863
		if (data->user_regs.abi) {
1864
			u64 mask = evsel->attr.sample_regs_user;
1865

1866
			sz = hweight_long(mask) * sizeof(u64);
1867
			OVERFLOW_CHECK(array, sz, max_size);
1868
			data->user_regs.mask = mask;
1869
			data->user_regs.regs = (u64 *)array;
1870
			array = (void *)array + sz;
1871 1872 1873 1874
		}
	}

	if (type & PERF_SAMPLE_STACK_USER) {
1875 1876
		OVERFLOW_CHECK_u64(array);
		sz = *array++;
1877 1878 1879 1880

		data->user_stack.offset = ((char *)(array - 1)
					  - (char *) event);

1881
		if (!sz) {
1882 1883
			data->user_stack.size = 0;
		} else {
1884
			OVERFLOW_CHECK(array, sz, max_size);
1885
			data->user_stack.data = (char *)array;
1886 1887
			array = (void *)array + sz;
			OVERFLOW_CHECK_u64(array);
1888
			data->user_stack.size = *array++;
1889 1890 1891
			if (WARN_ONCE(data->user_stack.size > sz,
				      "user stack dump failure\n"))
				return -EFAULT;
1892 1893 1894
		}
	}

1895 1896
	data->weight = 0;
	if (type & PERF_SAMPLE_WEIGHT) {
1897
		OVERFLOW_CHECK_u64(array);
1898 1899 1900 1901
		data->weight = *array;
		array++;
	}

1902 1903
	data->data_src = PERF_MEM_DATA_SRC_NONE;
	if (type & PERF_SAMPLE_DATA_SRC) {
1904
		OVERFLOW_CHECK_u64(array);
1905 1906 1907 1908
		data->data_src = *array;
		array++;
	}

1909 1910
	data->transaction = 0;
	if (type & PERF_SAMPLE_TRANSACTION) {
1911
		OVERFLOW_CHECK_u64(array);
1912 1913 1914 1915
		data->transaction = *array;
		array++;
	}

1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932
	data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
	if (type & PERF_SAMPLE_REGS_INTR) {
		OVERFLOW_CHECK_u64(array);
		data->intr_regs.abi = *array;
		array++;

		if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
			u64 mask = evsel->attr.sample_regs_intr;

			sz = hweight_long(mask) * sizeof(u64);
			OVERFLOW_CHECK(array, sz, max_size);
			data->intr_regs.mask = mask;
			data->intr_regs.regs = (u64 *)array;
			array = (void *)array + sz;
		}
	}

1933 1934
	return 0;
}
1935

1936
size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1937
				     u64 read_format)
1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
{
	size_t sz, result = sizeof(struct sample_event);

	if (type & PERF_SAMPLE_IDENTIFIER)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_IP)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_TID)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_TIME)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_ADDR)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_ID)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_STREAM_ID)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_CPU)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_PERIOD)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_READ) {
		result += sizeof(u64);
		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
			result += sizeof(u64);
		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
			result += sizeof(u64);
		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
		if (read_format & PERF_FORMAT_GROUP) {
			sz = sample->read.group.nr *
			     sizeof(struct sample_read_value);
			result += sz;
		} else {
			result += sizeof(u64);
		}
	}

	if (type & PERF_SAMPLE_CALLCHAIN) {
		sz = (sample->callchain->nr + 1) * sizeof(u64);
		result += sz;
	}

	if (type & PERF_SAMPLE_RAW) {
		result += sizeof(u32);
		result += sample->raw_size;
	}

	if (type & PERF_SAMPLE_BRANCH_STACK) {
		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
		sz += sizeof(u64);
		result += sz;
	}

	if (type & PERF_SAMPLE_REGS_USER) {
		if (sample->user_regs.abi) {
			result += sizeof(u64);
2003
			sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
			result += sz;
		} else {
			result += sizeof(u64);
		}
	}

	if (type & PERF_SAMPLE_STACK_USER) {
		sz = sample->user_stack.size;
		result += sizeof(u64);
		if (sz) {
			result += sz;
			result += sizeof(u64);
		}
	}

	if (type & PERF_SAMPLE_WEIGHT)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_DATA_SRC)
		result += sizeof(u64);

2025 2026 2027
	if (type & PERF_SAMPLE_TRANSACTION)
		result += sizeof(u64);

2028 2029 2030 2031 2032 2033 2034 2035 2036 2037
	if (type & PERF_SAMPLE_REGS_INTR) {
		if (sample->intr_regs.abi) {
			result += sizeof(u64);
			sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
			result += sz;
		} else {
			result += sizeof(u64);
		}
	}

2038 2039 2040
	return result;
}

2041
int perf_event__synthesize_sample(union perf_event *event, u64 type,
2042
				  u64 read_format,
2043 2044 2045 2046
				  const struct perf_sample *sample,
				  bool swapped)
{
	u64 *array;
2047
	size_t sz;
2048 2049 2050 2051
	/*
	 * used for cross-endian analysis. See git commit 65014ab3
	 * for why this goofiness is needed.
	 */
2052
	union u64_swap u;
2053 2054 2055

	array = event->sample.array;

2056 2057 2058 2059 2060
	if (type & PERF_SAMPLE_IDENTIFIER) {
		*array = sample->id;
		array++;
	}

2061
	if (type & PERF_SAMPLE_IP) {
2062
		*array = sample->ip;
2063 2064 2065 2066 2067 2068 2069 2070
		array++;
	}

	if (type & PERF_SAMPLE_TID) {
		u.val32[0] = sample->pid;
		u.val32[1] = sample->tid;
		if (swapped) {
			/*
2071
			 * Inverse of what is done in perf_evsel__parse_sample
2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
			 */
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
			u.val64 = bswap_64(u.val64);
		}

		*array = u.val64;
		array++;
	}

	if (type & PERF_SAMPLE_TIME) {
		*array = sample->time;
		array++;
	}

	if (type & PERF_SAMPLE_ADDR) {
		*array = sample->addr;
		array++;
	}

	if (type & PERF_SAMPLE_ID) {
		*array = sample->id;
		array++;
	}

	if (type & PERF_SAMPLE_STREAM_ID) {
		*array = sample->stream_id;
		array++;
	}

	if (type & PERF_SAMPLE_CPU) {
		u.val32[0] = sample->cpu;
		if (swapped) {
			/*
2106
			 * Inverse of what is done in perf_evsel__parse_sample
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119
			 */
			u.val32[0] = bswap_32(u.val32[0]);
			u.val64 = bswap_64(u.val64);
		}
		*array = u.val64;
		array++;
	}

	if (type & PERF_SAMPLE_PERIOD) {
		*array = sample->period;
		array++;
	}

2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
	if (type & PERF_SAMPLE_READ) {
		if (read_format & PERF_FORMAT_GROUP)
			*array = sample->read.group.nr;
		else
			*array = sample->read.one.value;
		array++;

		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
			*array = sample->read.time_enabled;
			array++;
		}

		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
			*array = sample->read.time_running;
			array++;
		}

		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
		if (read_format & PERF_FORMAT_GROUP) {
			sz = sample->read.group.nr *
			     sizeof(struct sample_read_value);
			memcpy(array, sample->read.group.values, sz);
			array = (void *)array + sz;
		} else {
			*array = sample->read.one.id;
			array++;
		}
	}

	if (type & PERF_SAMPLE_CALLCHAIN) {
		sz = (sample->callchain->nr + 1) * sizeof(u64);
		memcpy(array, sample->callchain, sz);
		array = (void *)array + sz;
	}

	if (type & PERF_SAMPLE_RAW) {
		u.val32[0] = sample->raw_size;
		if (WARN_ONCE(swapped,
			      "Endianness of raw data not corrected!\n")) {
			/*
			 * Inverse of what is done in perf_evsel__parse_sample
			 */
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
			u.val64 = bswap_64(u.val64);
		}
		*array = u.val64;
		array = (void *)array + sizeof(u32);

		memcpy(array, sample->raw_data, sample->raw_size);
		array = (void *)array + sample->raw_size;
	}

	if (type & PERF_SAMPLE_BRANCH_STACK) {
		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
		sz += sizeof(u64);
		memcpy(array, sample->branch_stack, sz);
		array = (void *)array + sz;
	}

	if (type & PERF_SAMPLE_REGS_USER) {
		if (sample->user_regs.abi) {
			*array++ = sample->user_regs.abi;
2183
			sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210
			memcpy(array, sample->user_regs.regs, sz);
			array = (void *)array + sz;
		} else {
			*array++ = 0;
		}
	}

	if (type & PERF_SAMPLE_STACK_USER) {
		sz = sample->user_stack.size;
		*array++ = sz;
		if (sz) {
			memcpy(array, sample->user_stack.data, sz);
			array = (void *)array + sz;
			*array++ = sz;
		}
	}

	if (type & PERF_SAMPLE_WEIGHT) {
		*array = sample->weight;
		array++;
	}

	if (type & PERF_SAMPLE_DATA_SRC) {
		*array = sample->data_src;
		array++;
	}

2211 2212 2213 2214 2215
	if (type & PERF_SAMPLE_TRANSACTION) {
		*array = sample->transaction;
		array++;
	}

2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226
	if (type & PERF_SAMPLE_REGS_INTR) {
		if (sample->intr_regs.abi) {
			*array++ = sample->intr_regs.abi;
			sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
			memcpy(array, sample->intr_regs.regs, sz);
			array = (void *)array + sz;
		} else {
			*array++ = 0;
		}
	}

2227 2228
	return 0;
}
2229

2230 2231 2232 2233 2234
struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
{
	return pevent_find_field(evsel->tp_format, name);
}

2235
void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2236 2237
			 const char *name)
{
2238
	struct format_field *field = perf_evsel__field(evsel, name);
2239 2240
	int offset;

2241 2242
	if (!field)
		return NULL;
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253

	offset = field->offset;

	if (field->flags & FIELD_IS_DYNAMIC) {
		offset = *(int *)(sample->raw_data + field->offset);
		offset &= 0xffff;
	}

	return sample->raw_data + offset;
}

2254 2255
u64 format_field__intval(struct format_field *field, struct perf_sample *sample,
			 bool needs_swap)
2256
{
2257
	u64 value;
2258
	void *ptr = sample->raw_data + field->offset;
2259

2260 2261 2262 2263 2264 2265 2266 2267 2268 2269
	switch (field->size) {
	case 1:
		return *(u8 *)ptr;
	case 2:
		value = *(u16 *)ptr;
		break;
	case 4:
		value = *(u32 *)ptr;
		break;
	case 8:
2270
		memcpy(&value, ptr, sizeof(u64));
2271 2272 2273 2274 2275
		break;
	default:
		return 0;
	}

2276
	if (!needs_swap)
2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290
		return value;

	switch (field->size) {
	case 2:
		return bswap_16(value);
	case 4:
		return bswap_32(value);
	case 8:
		return bswap_64(value);
	default:
		return 0;
	}

	return 0;
2291
}
2292

2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303
u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
		       const char *name)
{
	struct format_field *field = perf_evsel__field(evsel, name);

	if (!field)
		return 0;

	return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
}

2304 2305 2306
bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
			  char *msg, size_t msgsize)
{
2307 2308
	int paranoid;

2309
	if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325
	    evsel->attr.type   == PERF_TYPE_HARDWARE &&
	    evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
		/*
		 * If it's cycles then fall back to hrtimer based
		 * cpu-clock-tick sw counter, which is always available even if
		 * no PMU support.
		 *
		 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
		 * b0a873e).
		 */
		scnprintf(msg, msgsize, "%s",
"The cycles event is not supported, trying to fall back to cpu-clock-ticks");

		evsel->attr.type   = PERF_TYPE_SOFTWARE;
		evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;

2326
		zfree(&evsel->name);
2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
		return true;
	} else if (err == EACCES && !evsel->attr.exclude_kernel &&
		   (paranoid = perf_event_paranoid()) > 1) {
		const char *name = perf_evsel__name(evsel);
		char *new_name;

		if (asprintf(&new_name, "%s%su", name, strchr(name, ':') ? "" : ":") < 0)
			return false;

		if (evsel->name)
			free(evsel->name);
		evsel->name = new_name;
		scnprintf(msg, msgsize,
"kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
		evsel->attr.exclude_kernel = 1;

2343 2344 2345 2346 2347
		return true;
	}

	return false;
}
2348

2349
int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2350 2351
			      int err, char *msg, size_t size)
{
2352 2353
	char sbuf[STRERR_BUFSIZE];

2354 2355 2356
	switch (err) {
	case EPERM:
	case EACCES:
2357
		return scnprintf(msg, size,
2358 2359 2360 2361
		 "You may not have permission to collect %sstats.\n\n"
		 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
		 "which controls use of the performance events system by\n"
		 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2362
		 "The current value is %d:\n\n"
2363 2364 2365 2366
		 "  -1: Allow use of (almost) all events by all users\n"
		 ">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
		 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
		 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
2367 2368
				 target->system_wide ? "system-wide " : "",
				 perf_event_paranoid());
2369 2370 2371 2372 2373 2374
	case ENOENT:
		return scnprintf(msg, size, "The %s event is not supported.",
				 perf_evsel__name(evsel));
	case EMFILE:
		return scnprintf(msg, size, "%s",
			 "Too many events are opened.\n"
2375 2376 2377
			 "Probably the maximum number of open file descriptors has been reached.\n"
			 "Hint: Try again after reducing the number of events.\n"
			 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2378 2379 2380 2381 2382 2383 2384 2385
	case ENOMEM:
		if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
		    access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
			return scnprintf(msg, size,
					 "Not enough memory to setup event with callchain.\n"
					 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
					 "Hint: Current value: %d", sysctl_perf_event_max_stack);
		break;
2386 2387 2388
	case ENODEV:
		if (target->cpu_list)
			return scnprintf(msg, size, "%s",
2389
	 "No such device - did you specify an out-of-range profile CPU?");
2390 2391
		break;
	case EOPNOTSUPP:
2392 2393 2394
		if (evsel->attr.sample_period != 0)
			return scnprintf(msg, size, "%s",
	"PMU Hardware doesn't support sampling/overflow-interrupts.");
2395 2396 2397 2398 2399 2400 2401 2402 2403 2404
		if (evsel->attr.precise_ip)
			return scnprintf(msg, size, "%s",
	"\'precise\' request may not be supported. Try removing 'p' modifier.");
#if defined(__i386__) || defined(__x86_64__)
		if (evsel->attr.type == PERF_TYPE_HARDWARE)
			return scnprintf(msg, size, "%s",
	"No hardware sampling interrupt available.\n"
	"No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
#endif
		break;
2405 2406 2407 2408 2409 2410
	case EBUSY:
		if (find_process("oprofiled"))
			return scnprintf(msg, size,
	"The PMU counters are busy/taken by another profiler.\n"
	"We found oprofile daemon running, please stop it and try again.");
		break;
2411 2412 2413 2414 2415 2416
	case EINVAL:
		if (perf_missing_features.clockid)
			return scnprintf(msg, size, "clockid feature not supported.");
		if (perf_missing_features.clockid_wrong)
			return scnprintf(msg, size, "wrong clockid (%d).", clockid);
		break;
2417 2418 2419 2420 2421
	default:
		break;
	}

	return scnprintf(msg, size,
2422
	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2423
	"/bin/dmesg may provide additional information.\n"
2424
	"No CONFIG_PERF_EVENTS=y kernel support configured?",
2425 2426
			 err, strerror_r(err, sbuf, sizeof(sbuf)),
			 perf_evsel__name(evsel));
2427
}