xref: /openbmc/linux/tools/perf/util/evsel.c (revision 76a4f7cc)
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 "bpf_counter.h"
29 #include "callchain.h"
30 #include "cgroup.h"
31 #include "counts.h"
32 #include "event.h"
33 #include "evsel.h"
34 #include "util/env.h"
35 #include "util/evsel_config.h"
36 #include "util/evsel_fprintf.h"
37 #include "evlist.h"
38 #include <perf/cpumap.h>
39 #include "thread_map.h"
40 #include "target.h"
41 #include "perf_regs.h"
42 #include "record.h"
43 #include "debug.h"
44 #include "trace-event.h"
45 #include "stat.h"
46 #include "string2.h"
47 #include "memswap.h"
48 #include "util.h"
49 #include "hashmap.h"
50 #include "pmu-hybrid.h"
51 #include "../perf-sys.h"
52 #include "util/parse-branch-options.h"
53 #include <internal/xyarray.h>
54 #include <internal/lib.h>
55 
56 #include <linux/ctype.h>
57 
58 struct perf_missing_features perf_missing_features;
59 
60 static clockid_t clockid;
61 
62 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
63 {
64 	return 0;
65 }
66 
67 void __weak test_attr__ready(void) { }
68 
69 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
70 {
71 }
72 
73 static struct {
74 	size_t	size;
75 	int	(*init)(struct evsel *evsel);
76 	void	(*fini)(struct evsel *evsel);
77 } perf_evsel__object = {
78 	.size = sizeof(struct evsel),
79 	.init = evsel__no_extra_init,
80 	.fini = evsel__no_extra_fini,
81 };
82 
83 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel),
84 			 void (*fini)(struct evsel *evsel))
85 {
86 
87 	if (object_size == 0)
88 		goto set_methods;
89 
90 	if (perf_evsel__object.size > object_size)
91 		return -EINVAL;
92 
93 	perf_evsel__object.size = object_size;
94 
95 set_methods:
96 	if (init != NULL)
97 		perf_evsel__object.init = init;
98 
99 	if (fini != NULL)
100 		perf_evsel__object.fini = fini;
101 
102 	return 0;
103 }
104 
105 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
106 
107 int __evsel__sample_size(u64 sample_type)
108 {
109 	u64 mask = sample_type & PERF_SAMPLE_MASK;
110 	int size = 0;
111 	int i;
112 
113 	for (i = 0; i < 64; i++) {
114 		if (mask & (1ULL << i))
115 			size++;
116 	}
117 
118 	size *= sizeof(u64);
119 
120 	return size;
121 }
122 
123 /**
124  * __perf_evsel__calc_id_pos - calculate id_pos.
125  * @sample_type: sample type
126  *
127  * This function returns the position of the event id (PERF_SAMPLE_ID or
128  * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
129  * perf_record_sample.
130  */
131 static int __perf_evsel__calc_id_pos(u64 sample_type)
132 {
133 	int idx = 0;
134 
135 	if (sample_type & PERF_SAMPLE_IDENTIFIER)
136 		return 0;
137 
138 	if (!(sample_type & PERF_SAMPLE_ID))
139 		return -1;
140 
141 	if (sample_type & PERF_SAMPLE_IP)
142 		idx += 1;
143 
144 	if (sample_type & PERF_SAMPLE_TID)
145 		idx += 1;
146 
147 	if (sample_type & PERF_SAMPLE_TIME)
148 		idx += 1;
149 
150 	if (sample_type & PERF_SAMPLE_ADDR)
151 		idx += 1;
152 
153 	return idx;
154 }
155 
156 /**
157  * __perf_evsel__calc_is_pos - calculate is_pos.
158  * @sample_type: sample type
159  *
160  * This function returns the position (counting backwards) of the event id
161  * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
162  * sample_id_all is used there is an id sample appended to non-sample events.
163  */
164 static int __perf_evsel__calc_is_pos(u64 sample_type)
165 {
166 	int idx = 1;
167 
168 	if (sample_type & PERF_SAMPLE_IDENTIFIER)
169 		return 1;
170 
171 	if (!(sample_type & PERF_SAMPLE_ID))
172 		return -1;
173 
174 	if (sample_type & PERF_SAMPLE_CPU)
175 		idx += 1;
176 
177 	if (sample_type & PERF_SAMPLE_STREAM_ID)
178 		idx += 1;
179 
180 	return idx;
181 }
182 
183 void evsel__calc_id_pos(struct evsel *evsel)
184 {
185 	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
186 	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
187 }
188 
189 void __evsel__set_sample_bit(struct evsel *evsel,
190 				  enum perf_event_sample_format bit)
191 {
192 	if (!(evsel->core.attr.sample_type & bit)) {
193 		evsel->core.attr.sample_type |= bit;
194 		evsel->sample_size += sizeof(u64);
195 		evsel__calc_id_pos(evsel);
196 	}
197 }
198 
199 void __evsel__reset_sample_bit(struct evsel *evsel,
200 				    enum perf_event_sample_format bit)
201 {
202 	if (evsel->core.attr.sample_type & bit) {
203 		evsel->core.attr.sample_type &= ~bit;
204 		evsel->sample_size -= sizeof(u64);
205 		evsel__calc_id_pos(evsel);
206 	}
207 }
208 
209 void evsel__set_sample_id(struct evsel *evsel,
210 			       bool can_sample_identifier)
211 {
212 	if (can_sample_identifier) {
213 		evsel__reset_sample_bit(evsel, ID);
214 		evsel__set_sample_bit(evsel, IDENTIFIER);
215 	} else {
216 		evsel__set_sample_bit(evsel, ID);
217 	}
218 	evsel->core.attr.read_format |= PERF_FORMAT_ID;
219 }
220 
221 /**
222  * evsel__is_function_event - Return whether given evsel is a function
223  * trace event
224  *
225  * @evsel - evsel selector to be tested
226  *
227  * Return %true if event is function trace event
228  */
229 bool evsel__is_function_event(struct evsel *evsel)
230 {
231 #define FUNCTION_EVENT "ftrace:function"
232 
233 	return evsel->name &&
234 	       !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
235 
236 #undef FUNCTION_EVENT
237 }
238 
239 void evsel__init(struct evsel *evsel,
240 		 struct perf_event_attr *attr, int idx)
241 {
242 	perf_evsel__init(&evsel->core, attr, idx);
243 	evsel->tracking	   = !idx;
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 	INIT_LIST_HEAD(&evsel->bpf_counter_list);
252 	perf_evsel__object.init(evsel);
253 	evsel->sample_size = __evsel__sample_size(attr->sample_type);
254 	evsel__calc_id_pos(evsel);
255 	evsel->cmdline_group_boundary = false;
256 	evsel->metric_expr   = NULL;
257 	evsel->metric_name   = NULL;
258 	evsel->metric_events = NULL;
259 	evsel->per_pkg_mask  = NULL;
260 	evsel->collect_stat  = false;
261 	evsel->pmu_name      = NULL;
262 }
263 
264 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
265 {
266 	struct evsel *evsel = zalloc(perf_evsel__object.size);
267 
268 	if (!evsel)
269 		return NULL;
270 	evsel__init(evsel, attr, idx);
271 
272 	if (evsel__is_bpf_output(evsel)) {
273 		evsel->core.attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
274 					    PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
275 		evsel->core.attr.sample_period = 1;
276 	}
277 
278 	if (evsel__is_clock(evsel)) {
279 		/*
280 		 * The evsel->unit points to static alias->unit
281 		 * so it's ok to use static string in here.
282 		 */
283 		static const char *unit = "msec";
284 
285 		evsel->unit = unit;
286 		evsel->scale = 1e-6;
287 	}
288 
289 	return evsel;
290 }
291 
292 static bool perf_event_can_profile_kernel(void)
293 {
294 	return perf_event_paranoid_check(1);
295 }
296 
297 struct evsel *evsel__new_cycles(bool precise, __u32 type, __u64 config)
298 {
299 	struct perf_event_attr attr = {
300 		.type	= type,
301 		.config	= config,
302 		.exclude_kernel	= !perf_event_can_profile_kernel(),
303 	};
304 	struct evsel *evsel;
305 
306 	event_attr_init(&attr);
307 
308 	if (!precise)
309 		goto new_event;
310 
311 	/*
312 	 * Now let the usual logic to set up the perf_event_attr defaults
313 	 * to kick in when we return and before perf_evsel__open() is called.
314 	 */
315 new_event:
316 	evsel = evsel__new(&attr);
317 	if (evsel == NULL)
318 		goto out;
319 
320 	evsel->precise_max = true;
321 
322 	/* use asprintf() because free(evsel) assumes name is allocated */
323 	if (asprintf(&evsel->name, "cycles%s%s%.*s",
324 		     (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
325 		     attr.exclude_kernel ? "u" : "",
326 		     attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
327 		goto error_free;
328 out:
329 	return evsel;
330 error_free:
331 	evsel__delete(evsel);
332 	evsel = NULL;
333 	goto out;
334 }
335 
336 int copy_config_terms(struct list_head *dst, struct list_head *src)
337 {
338 	struct evsel_config_term *pos, *tmp;
339 
340 	list_for_each_entry(pos, src, list) {
341 		tmp = malloc(sizeof(*tmp));
342 		if (tmp == NULL)
343 			return -ENOMEM;
344 
345 		*tmp = *pos;
346 		if (tmp->free_str) {
347 			tmp->val.str = strdup(pos->val.str);
348 			if (tmp->val.str == NULL) {
349 				free(tmp);
350 				return -ENOMEM;
351 			}
352 		}
353 		list_add_tail(&tmp->list, dst);
354 	}
355 	return 0;
356 }
357 
358 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src)
359 {
360 	return copy_config_terms(&dst->config_terms, &src->config_terms);
361 }
362 
363 /**
364  * evsel__clone - create a new evsel copied from @orig
365  * @orig: original evsel
366  *
367  * The assumption is that @orig is not configured nor opened yet.
368  * So we only care about the attributes that can be set while it's parsed.
369  */
370 struct evsel *evsel__clone(struct evsel *orig)
371 {
372 	struct evsel *evsel;
373 
374 	BUG_ON(orig->core.fd);
375 	BUG_ON(orig->counts);
376 	BUG_ON(orig->priv);
377 	BUG_ON(orig->per_pkg_mask);
378 
379 	/* cannot handle BPF objects for now */
380 	if (orig->bpf_obj)
381 		return NULL;
382 
383 	evsel = evsel__new(&orig->core.attr);
384 	if (evsel == NULL)
385 		return NULL;
386 
387 	evsel->core.cpus = perf_cpu_map__get(orig->core.cpus);
388 	evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus);
389 	evsel->core.threads = perf_thread_map__get(orig->core.threads);
390 	evsel->core.nr_members = orig->core.nr_members;
391 	evsel->core.system_wide = orig->core.system_wide;
392 
393 	if (orig->name) {
394 		evsel->name = strdup(orig->name);
395 		if (evsel->name == NULL)
396 			goto out_err;
397 	}
398 	if (orig->group_name) {
399 		evsel->group_name = strdup(orig->group_name);
400 		if (evsel->group_name == NULL)
401 			goto out_err;
402 	}
403 	if (orig->pmu_name) {
404 		evsel->pmu_name = strdup(orig->pmu_name);
405 		if (evsel->pmu_name == NULL)
406 			goto out_err;
407 	}
408 	if (orig->filter) {
409 		evsel->filter = strdup(orig->filter);
410 		if (evsel->filter == NULL)
411 			goto out_err;
412 	}
413 	evsel->cgrp = cgroup__get(orig->cgrp);
414 	evsel->tp_format = orig->tp_format;
415 	evsel->handler = orig->handler;
416 	evsel->core.leader = orig->core.leader;
417 
418 	evsel->max_events = orig->max_events;
419 	evsel->tool_event = orig->tool_event;
420 	evsel->unit = orig->unit;
421 	evsel->scale = orig->scale;
422 	evsel->snapshot = orig->snapshot;
423 	evsel->per_pkg = orig->per_pkg;
424 	evsel->percore = orig->percore;
425 	evsel->precise_max = orig->precise_max;
426 	evsel->use_uncore_alias = orig->use_uncore_alias;
427 	evsel->is_libpfm_event = orig->is_libpfm_event;
428 
429 	evsel->exclude_GH = orig->exclude_GH;
430 	evsel->sample_read = orig->sample_read;
431 	evsel->auto_merge_stats = orig->auto_merge_stats;
432 	evsel->collect_stat = orig->collect_stat;
433 	evsel->weak_group = orig->weak_group;
434 	evsel->use_config_name = orig->use_config_name;
435 
436 	if (evsel__copy_config_terms(evsel, orig) < 0)
437 		goto out_err;
438 
439 	return evsel;
440 
441 out_err:
442 	evsel__delete(evsel);
443 	return NULL;
444 }
445 
446 /*
447  * Returns pointer with encoded error via <linux/err.h> interface.
448  */
449 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx)
450 {
451 	struct evsel *evsel = zalloc(perf_evsel__object.size);
452 	int err = -ENOMEM;
453 
454 	if (evsel == NULL) {
455 		goto out_err;
456 	} else {
457 		struct perf_event_attr attr = {
458 			.type	       = PERF_TYPE_TRACEPOINT,
459 			.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
460 					  PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
461 		};
462 
463 		if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
464 			goto out_free;
465 
466 		evsel->tp_format = trace_event__tp_format(sys, name);
467 		if (IS_ERR(evsel->tp_format)) {
468 			err = PTR_ERR(evsel->tp_format);
469 			goto out_free;
470 		}
471 
472 		event_attr_init(&attr);
473 		attr.config = evsel->tp_format->id;
474 		attr.sample_period = 1;
475 		evsel__init(evsel, &attr, idx);
476 	}
477 
478 	return evsel;
479 
480 out_free:
481 	zfree(&evsel->name);
482 	free(evsel);
483 out_err:
484 	return ERR_PTR(err);
485 }
486 
487 const char *evsel__hw_names[PERF_COUNT_HW_MAX] = {
488 	"cycles",
489 	"instructions",
490 	"cache-references",
491 	"cache-misses",
492 	"branches",
493 	"branch-misses",
494 	"bus-cycles",
495 	"stalled-cycles-frontend",
496 	"stalled-cycles-backend",
497 	"ref-cycles",
498 };
499 
500 char *evsel__bpf_counter_events;
501 
502 bool evsel__match_bpf_counter_events(const char *name)
503 {
504 	int name_len;
505 	bool match;
506 	char *ptr;
507 
508 	if (!evsel__bpf_counter_events)
509 		return false;
510 
511 	ptr = strstr(evsel__bpf_counter_events, name);
512 	name_len = strlen(name);
513 
514 	/* check name matches a full token in evsel__bpf_counter_events */
515 	match = (ptr != NULL) &&
516 		((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) &&
517 		((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0'));
518 
519 	return match;
520 }
521 
522 static const char *__evsel__hw_name(u64 config)
523 {
524 	if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config])
525 		return evsel__hw_names[config];
526 
527 	return "unknown-hardware";
528 }
529 
530 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
531 {
532 	int colon = 0, r = 0;
533 	struct perf_event_attr *attr = &evsel->core.attr;
534 	bool exclude_guest_default = false;
535 
536 #define MOD_PRINT(context, mod)	do {					\
537 		if (!attr->exclude_##context) {				\
538 			if (!colon) colon = ++r;			\
539 			r += scnprintf(bf + r, size - r, "%c", mod);	\
540 		} } while(0)
541 
542 	if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
543 		MOD_PRINT(kernel, 'k');
544 		MOD_PRINT(user, 'u');
545 		MOD_PRINT(hv, 'h');
546 		exclude_guest_default = true;
547 	}
548 
549 	if (attr->precise_ip) {
550 		if (!colon)
551 			colon = ++r;
552 		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
553 		exclude_guest_default = true;
554 	}
555 
556 	if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
557 		MOD_PRINT(host, 'H');
558 		MOD_PRINT(guest, 'G');
559 	}
560 #undef MOD_PRINT
561 	if (colon)
562 		bf[colon - 1] = ':';
563 	return r;
564 }
565 
566 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
567 {
568 	int r = scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
569 	return r + evsel__add_modifiers(evsel, bf + r, size - r);
570 }
571 
572 const char *evsel__sw_names[PERF_COUNT_SW_MAX] = {
573 	"cpu-clock",
574 	"task-clock",
575 	"page-faults",
576 	"context-switches",
577 	"cpu-migrations",
578 	"minor-faults",
579 	"major-faults",
580 	"alignment-faults",
581 	"emulation-faults",
582 	"dummy",
583 };
584 
585 static const char *__evsel__sw_name(u64 config)
586 {
587 	if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config])
588 		return evsel__sw_names[config];
589 	return "unknown-software";
590 }
591 
592 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
593 {
594 	int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
595 	return r + evsel__add_modifiers(evsel, bf + r, size - r);
596 }
597 
598 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
599 {
600 	int r;
601 
602 	r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
603 
604 	if (type & HW_BREAKPOINT_R)
605 		r += scnprintf(bf + r, size - r, "r");
606 
607 	if (type & HW_BREAKPOINT_W)
608 		r += scnprintf(bf + r, size - r, "w");
609 
610 	if (type & HW_BREAKPOINT_X)
611 		r += scnprintf(bf + r, size - r, "x");
612 
613 	return r;
614 }
615 
616 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
617 {
618 	struct perf_event_attr *attr = &evsel->core.attr;
619 	int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
620 	return r + evsel__add_modifiers(evsel, bf + r, size - r);
621 }
622 
623 const char *evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = {
624  { "L1-dcache",	"l1-d",		"l1d",		"L1-data",		},
625  { "L1-icache",	"l1-i",		"l1i",		"L1-instruction",	},
626  { "LLC",	"L2",							},
627  { "dTLB",	"d-tlb",	"Data-TLB",				},
628  { "iTLB",	"i-tlb",	"Instruction-TLB",			},
629  { "branch",	"branches",	"bpu",		"btb",		"bpc",	},
630  { "node",								},
631 };
632 
633 const char *evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = {
634  { "load",	"loads",	"read",					},
635  { "store",	"stores",	"write",				},
636  { "prefetch",	"prefetches",	"speculative-read", "speculative-load",	},
637 };
638 
639 const char *evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = {
640  { "refs",	"Reference",	"ops",		"access",		},
641  { "misses",	"miss",							},
642 };
643 
644 #define C(x)		PERF_COUNT_HW_CACHE_##x
645 #define CACHE_READ	(1 << C(OP_READ))
646 #define CACHE_WRITE	(1 << C(OP_WRITE))
647 #define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
648 #define COP(x)		(1 << x)
649 
650 /*
651  * cache operation stat
652  * L1I : Read and prefetch only
653  * ITLB and BPU : Read-only
654  */
655 static unsigned long evsel__hw_cache_stat[C(MAX)] = {
656  [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
657  [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
658  [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
659  [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
660  [C(ITLB)]	= (CACHE_READ),
661  [C(BPU)]	= (CACHE_READ),
662  [C(NODE)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
663 };
664 
665 bool evsel__is_cache_op_valid(u8 type, u8 op)
666 {
667 	if (evsel__hw_cache_stat[type] & COP(op))
668 		return true;	/* valid */
669 	else
670 		return false;	/* invalid */
671 }
672 
673 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
674 {
675 	if (result) {
676 		return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0],
677 				 evsel__hw_cache_op[op][0],
678 				 evsel__hw_cache_result[result][0]);
679 	}
680 
681 	return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0],
682 			 evsel__hw_cache_op[op][1]);
683 }
684 
685 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
686 {
687 	u8 op, result, type = (config >>  0) & 0xff;
688 	const char *err = "unknown-ext-hardware-cache-type";
689 
690 	if (type >= PERF_COUNT_HW_CACHE_MAX)
691 		goto out_err;
692 
693 	op = (config >>  8) & 0xff;
694 	err = "unknown-ext-hardware-cache-op";
695 	if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
696 		goto out_err;
697 
698 	result = (config >> 16) & 0xff;
699 	err = "unknown-ext-hardware-cache-result";
700 	if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
701 		goto out_err;
702 
703 	err = "invalid-cache";
704 	if (!evsel__is_cache_op_valid(type, op))
705 		goto out_err;
706 
707 	return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
708 out_err:
709 	return scnprintf(bf, size, "%s", err);
710 }
711 
712 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
713 {
714 	int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
715 	return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
716 }
717 
718 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
719 {
720 	int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
721 	return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
722 }
723 
724 static int evsel__tool_name(char *bf, size_t size)
725 {
726 	int ret = scnprintf(bf, size, "duration_time");
727 	return ret;
728 }
729 
730 const char *evsel__name(struct evsel *evsel)
731 {
732 	char bf[128];
733 
734 	if (!evsel)
735 		goto out_unknown;
736 
737 	if (evsel->name)
738 		return evsel->name;
739 
740 	switch (evsel->core.attr.type) {
741 	case PERF_TYPE_RAW:
742 		evsel__raw_name(evsel, bf, sizeof(bf));
743 		break;
744 
745 	case PERF_TYPE_HARDWARE:
746 		evsel__hw_name(evsel, bf, sizeof(bf));
747 		break;
748 
749 	case PERF_TYPE_HW_CACHE:
750 		evsel__hw_cache_name(evsel, bf, sizeof(bf));
751 		break;
752 
753 	case PERF_TYPE_SOFTWARE:
754 		if (evsel->tool_event)
755 			evsel__tool_name(bf, sizeof(bf));
756 		else
757 			evsel__sw_name(evsel, bf, sizeof(bf));
758 		break;
759 
760 	case PERF_TYPE_TRACEPOINT:
761 		scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
762 		break;
763 
764 	case PERF_TYPE_BREAKPOINT:
765 		evsel__bp_name(evsel, bf, sizeof(bf));
766 		break;
767 
768 	default:
769 		scnprintf(bf, sizeof(bf), "unknown attr type: %d",
770 			  evsel->core.attr.type);
771 		break;
772 	}
773 
774 	evsel->name = strdup(bf);
775 
776 	if (evsel->name)
777 		return evsel->name;
778 out_unknown:
779 	return "unknown";
780 }
781 
782 const char *evsel__group_name(struct evsel *evsel)
783 {
784 	return evsel->group_name ?: "anon group";
785 }
786 
787 /*
788  * Returns the group details for the specified leader,
789  * with following rules.
790  *
791  *  For record -e '{cycles,instructions}'
792  *    'anon group { cycles:u, instructions:u }'
793  *
794  *  For record -e 'cycles,instructions' and report --group
795  *    'cycles:u, instructions:u'
796  */
797 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
798 {
799 	int ret = 0;
800 	struct evsel *pos;
801 	const char *group_name = evsel__group_name(evsel);
802 
803 	if (!evsel->forced_leader)
804 		ret = scnprintf(buf, size, "%s { ", group_name);
805 
806 	ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel));
807 
808 	for_each_group_member(pos, evsel)
809 		ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos));
810 
811 	if (!evsel->forced_leader)
812 		ret += scnprintf(buf + ret, size - ret, " }");
813 
814 	return ret;
815 }
816 
817 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
818 				      struct callchain_param *param)
819 {
820 	bool function = evsel__is_function_event(evsel);
821 	struct perf_event_attr *attr = &evsel->core.attr;
822 
823 	evsel__set_sample_bit(evsel, CALLCHAIN);
824 
825 	attr->sample_max_stack = param->max_stack;
826 
827 	if (opts->kernel_callchains)
828 		attr->exclude_callchain_user = 1;
829 	if (opts->user_callchains)
830 		attr->exclude_callchain_kernel = 1;
831 	if (param->record_mode == CALLCHAIN_LBR) {
832 		if (!opts->branch_stack) {
833 			if (attr->exclude_user) {
834 				pr_warning("LBR callstack option is only available "
835 					   "to get user callchain information. "
836 					   "Falling back to framepointers.\n");
837 			} else {
838 				evsel__set_sample_bit(evsel, BRANCH_STACK);
839 				attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
840 							PERF_SAMPLE_BRANCH_CALL_STACK |
841 							PERF_SAMPLE_BRANCH_NO_CYCLES |
842 							PERF_SAMPLE_BRANCH_NO_FLAGS |
843 							PERF_SAMPLE_BRANCH_HW_INDEX;
844 			}
845 		} else
846 			 pr_warning("Cannot use LBR callstack with branch stack. "
847 				    "Falling back to framepointers.\n");
848 	}
849 
850 	if (param->record_mode == CALLCHAIN_DWARF) {
851 		if (!function) {
852 			evsel__set_sample_bit(evsel, REGS_USER);
853 			evsel__set_sample_bit(evsel, STACK_USER);
854 			if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
855 				attr->sample_regs_user |= DWARF_MINIMAL_REGS;
856 				pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
857 					   "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
858 					   "so the minimal registers set (IP, SP) is explicitly forced.\n");
859 			} else {
860 				attr->sample_regs_user |= PERF_REGS_MASK;
861 			}
862 			attr->sample_stack_user = param->dump_size;
863 			attr->exclude_callchain_user = 1;
864 		} else {
865 			pr_info("Cannot use DWARF unwind for function trace event,"
866 				" falling back to framepointers.\n");
867 		}
868 	}
869 
870 	if (function) {
871 		pr_info("Disabling user space callchains for function trace event.\n");
872 		attr->exclude_callchain_user = 1;
873 	}
874 }
875 
876 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
877 			     struct callchain_param *param)
878 {
879 	if (param->enabled)
880 		return __evsel__config_callchain(evsel, opts, param);
881 }
882 
883 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param)
884 {
885 	struct perf_event_attr *attr = &evsel->core.attr;
886 
887 	evsel__reset_sample_bit(evsel, CALLCHAIN);
888 	if (param->record_mode == CALLCHAIN_LBR) {
889 		evsel__reset_sample_bit(evsel, BRANCH_STACK);
890 		attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
891 					      PERF_SAMPLE_BRANCH_CALL_STACK |
892 					      PERF_SAMPLE_BRANCH_HW_INDEX);
893 	}
894 	if (param->record_mode == CALLCHAIN_DWARF) {
895 		evsel__reset_sample_bit(evsel, REGS_USER);
896 		evsel__reset_sample_bit(evsel, STACK_USER);
897 	}
898 }
899 
900 static void evsel__apply_config_terms(struct evsel *evsel,
901 				      struct record_opts *opts, bool track)
902 {
903 	struct evsel_config_term *term;
904 	struct list_head *config_terms = &evsel->config_terms;
905 	struct perf_event_attr *attr = &evsel->core.attr;
906 	/* callgraph default */
907 	struct callchain_param param = {
908 		.record_mode = callchain_param.record_mode,
909 	};
910 	u32 dump_size = 0;
911 	int max_stack = 0;
912 	const char *callgraph_buf = NULL;
913 
914 	list_for_each_entry(term, config_terms, list) {
915 		switch (term->type) {
916 		case EVSEL__CONFIG_TERM_PERIOD:
917 			if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
918 				attr->sample_period = term->val.period;
919 				attr->freq = 0;
920 				evsel__reset_sample_bit(evsel, PERIOD);
921 			}
922 			break;
923 		case EVSEL__CONFIG_TERM_FREQ:
924 			if (!(term->weak && opts->user_freq != UINT_MAX)) {
925 				attr->sample_freq = term->val.freq;
926 				attr->freq = 1;
927 				evsel__set_sample_bit(evsel, PERIOD);
928 			}
929 			break;
930 		case EVSEL__CONFIG_TERM_TIME:
931 			if (term->val.time)
932 				evsel__set_sample_bit(evsel, TIME);
933 			else
934 				evsel__reset_sample_bit(evsel, TIME);
935 			break;
936 		case EVSEL__CONFIG_TERM_CALLGRAPH:
937 			callgraph_buf = term->val.str;
938 			break;
939 		case EVSEL__CONFIG_TERM_BRANCH:
940 			if (term->val.str && strcmp(term->val.str, "no")) {
941 				evsel__set_sample_bit(evsel, BRANCH_STACK);
942 				parse_branch_str(term->val.str,
943 						 &attr->branch_sample_type);
944 			} else
945 				evsel__reset_sample_bit(evsel, BRANCH_STACK);
946 			break;
947 		case EVSEL__CONFIG_TERM_STACK_USER:
948 			dump_size = term->val.stack_user;
949 			break;
950 		case EVSEL__CONFIG_TERM_MAX_STACK:
951 			max_stack = term->val.max_stack;
952 			break;
953 		case EVSEL__CONFIG_TERM_MAX_EVENTS:
954 			evsel->max_events = term->val.max_events;
955 			break;
956 		case EVSEL__CONFIG_TERM_INHERIT:
957 			/*
958 			 * attr->inherit should has already been set by
959 			 * evsel__config. If user explicitly set
960 			 * inherit using config terms, override global
961 			 * opt->no_inherit setting.
962 			 */
963 			attr->inherit = term->val.inherit ? 1 : 0;
964 			break;
965 		case EVSEL__CONFIG_TERM_OVERWRITE:
966 			attr->write_backward = term->val.overwrite ? 1 : 0;
967 			break;
968 		case EVSEL__CONFIG_TERM_DRV_CFG:
969 			break;
970 		case EVSEL__CONFIG_TERM_PERCORE:
971 			break;
972 		case EVSEL__CONFIG_TERM_AUX_OUTPUT:
973 			attr->aux_output = term->val.aux_output ? 1 : 0;
974 			break;
975 		case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
976 			/* Already applied by auxtrace */
977 			break;
978 		case EVSEL__CONFIG_TERM_CFG_CHG:
979 			break;
980 		default:
981 			break;
982 		}
983 	}
984 
985 	/* User explicitly set per-event callgraph, clear the old setting and reset. */
986 	if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
987 		bool sample_address = false;
988 
989 		if (max_stack) {
990 			param.max_stack = max_stack;
991 			if (callgraph_buf == NULL)
992 				callgraph_buf = "fp";
993 		}
994 
995 		/* parse callgraph parameters */
996 		if (callgraph_buf != NULL) {
997 			if (!strcmp(callgraph_buf, "no")) {
998 				param.enabled = false;
999 				param.record_mode = CALLCHAIN_NONE;
1000 			} else {
1001 				param.enabled = true;
1002 				if (parse_callchain_record(callgraph_buf, &param)) {
1003 					pr_err("per-event callgraph setting for %s failed. "
1004 					       "Apply callgraph global setting for it\n",
1005 					       evsel->name);
1006 					return;
1007 				}
1008 				if (param.record_mode == CALLCHAIN_DWARF)
1009 					sample_address = true;
1010 			}
1011 		}
1012 		if (dump_size > 0) {
1013 			dump_size = round_up(dump_size, sizeof(u64));
1014 			param.dump_size = dump_size;
1015 		}
1016 
1017 		/* If global callgraph set, clear it */
1018 		if (callchain_param.enabled)
1019 			evsel__reset_callgraph(evsel, &callchain_param);
1020 
1021 		/* set perf-event callgraph */
1022 		if (param.enabled) {
1023 			if (sample_address) {
1024 				evsel__set_sample_bit(evsel, ADDR);
1025 				evsel__set_sample_bit(evsel, DATA_SRC);
1026 				evsel->core.attr.mmap_data = track;
1027 			}
1028 			evsel__config_callchain(evsel, opts, &param);
1029 		}
1030 	}
1031 }
1032 
1033 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type)
1034 {
1035 	struct evsel_config_term *term, *found_term = NULL;
1036 
1037 	list_for_each_entry(term, &evsel->config_terms, list) {
1038 		if (term->type == type)
1039 			found_term = term;
1040 	}
1041 
1042 	return found_term;
1043 }
1044 
1045 void __weak arch_evsel__set_sample_weight(struct evsel *evsel)
1046 {
1047 	evsel__set_sample_bit(evsel, WEIGHT);
1048 }
1049 
1050 /*
1051  * The enable_on_exec/disabled value strategy:
1052  *
1053  *  1) For any type of traced program:
1054  *    - all independent events and group leaders are disabled
1055  *    - all group members are enabled
1056  *
1057  *     Group members are ruled by group leaders. They need to
1058  *     be enabled, because the group scheduling relies on that.
1059  *
1060  *  2) For traced programs executed by perf:
1061  *     - all independent events and group leaders have
1062  *       enable_on_exec set
1063  *     - we don't specifically enable or disable any event during
1064  *       the record command
1065  *
1066  *     Independent events and group leaders are initially disabled
1067  *     and get enabled by exec. Group members are ruled by group
1068  *     leaders as stated in 1).
1069  *
1070  *  3) For traced programs attached by perf (pid/tid):
1071  *     - we specifically enable or disable all events during
1072  *       the record command
1073  *
1074  *     When attaching events to already running traced we
1075  *     enable/disable events specifically, as there's no
1076  *     initial traced exec call.
1077  */
1078 void evsel__config(struct evsel *evsel, struct record_opts *opts,
1079 		   struct callchain_param *callchain)
1080 {
1081 	struct evsel *leader = evsel__leader(evsel);
1082 	struct perf_event_attr *attr = &evsel->core.attr;
1083 	int track = evsel->tracking;
1084 	bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
1085 
1086 	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
1087 	attr->inherit	    = !opts->no_inherit;
1088 	attr->write_backward = opts->overwrite ? 1 : 0;
1089 
1090 	evsel__set_sample_bit(evsel, IP);
1091 	evsel__set_sample_bit(evsel, TID);
1092 
1093 	if (evsel->sample_read) {
1094 		evsel__set_sample_bit(evsel, READ);
1095 
1096 		/*
1097 		 * We need ID even in case of single event, because
1098 		 * PERF_SAMPLE_READ process ID specific data.
1099 		 */
1100 		evsel__set_sample_id(evsel, false);
1101 
1102 		/*
1103 		 * Apply group format only if we belong to group
1104 		 * with more than one members.
1105 		 */
1106 		if (leader->core.nr_members > 1) {
1107 			attr->read_format |= PERF_FORMAT_GROUP;
1108 			attr->inherit = 0;
1109 		}
1110 	}
1111 
1112 	/*
1113 	 * We default some events to have a default interval. But keep
1114 	 * it a weak assumption overridable by the user.
1115 	 */
1116 	if (!attr->sample_period) {
1117 		if (opts->freq) {
1118 			attr->freq		= 1;
1119 			attr->sample_freq	= opts->freq;
1120 		} else {
1121 			attr->sample_period = opts->default_interval;
1122 		}
1123 	}
1124 	/*
1125 	 * If attr->freq was set (here or earlier), ask for period
1126 	 * to be sampled.
1127 	 */
1128 	if (attr->freq)
1129 		evsel__set_sample_bit(evsel, PERIOD);
1130 
1131 	if (opts->no_samples)
1132 		attr->sample_freq = 0;
1133 
1134 	if (opts->inherit_stat) {
1135 		evsel->core.attr.read_format |=
1136 			PERF_FORMAT_TOTAL_TIME_ENABLED |
1137 			PERF_FORMAT_TOTAL_TIME_RUNNING |
1138 			PERF_FORMAT_ID;
1139 		attr->inherit_stat = 1;
1140 	}
1141 
1142 	if (opts->sample_address) {
1143 		evsel__set_sample_bit(evsel, ADDR);
1144 		attr->mmap_data = track;
1145 	}
1146 
1147 	/*
1148 	 * We don't allow user space callchains for  function trace
1149 	 * event, due to issues with page faults while tracing page
1150 	 * fault handler and its overall trickiness nature.
1151 	 */
1152 	if (evsel__is_function_event(evsel))
1153 		evsel->core.attr.exclude_callchain_user = 1;
1154 
1155 	if (callchain && callchain->enabled && !evsel->no_aux_samples)
1156 		evsel__config_callchain(evsel, opts, callchain);
1157 
1158 	if (opts->sample_intr_regs && !evsel->no_aux_samples &&
1159 	    !evsel__is_dummy_event(evsel)) {
1160 		attr->sample_regs_intr = opts->sample_intr_regs;
1161 		evsel__set_sample_bit(evsel, REGS_INTR);
1162 	}
1163 
1164 	if (opts->sample_user_regs && !evsel->no_aux_samples &&
1165 	    !evsel__is_dummy_event(evsel)) {
1166 		attr->sample_regs_user |= opts->sample_user_regs;
1167 		evsel__set_sample_bit(evsel, REGS_USER);
1168 	}
1169 
1170 	if (target__has_cpu(&opts->target) || opts->sample_cpu)
1171 		evsel__set_sample_bit(evsel, CPU);
1172 
1173 	/*
1174 	 * When the user explicitly disabled time don't force it here.
1175 	 */
1176 	if (opts->sample_time &&
1177 	    (!perf_missing_features.sample_id_all &&
1178 	    (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1179 	     opts->sample_time_set)))
1180 		evsel__set_sample_bit(evsel, TIME);
1181 
1182 	if (opts->raw_samples && !evsel->no_aux_samples) {
1183 		evsel__set_sample_bit(evsel, TIME);
1184 		evsel__set_sample_bit(evsel, RAW);
1185 		evsel__set_sample_bit(evsel, CPU);
1186 	}
1187 
1188 	if (opts->sample_address)
1189 		evsel__set_sample_bit(evsel, DATA_SRC);
1190 
1191 	if (opts->sample_phys_addr)
1192 		evsel__set_sample_bit(evsel, PHYS_ADDR);
1193 
1194 	if (opts->no_buffering) {
1195 		attr->watermark = 0;
1196 		attr->wakeup_events = 1;
1197 	}
1198 	if (opts->branch_stack && !evsel->no_aux_samples) {
1199 		evsel__set_sample_bit(evsel, BRANCH_STACK);
1200 		attr->branch_sample_type = opts->branch_stack;
1201 	}
1202 
1203 	if (opts->sample_weight)
1204 		arch_evsel__set_sample_weight(evsel);
1205 
1206 	attr->task     = track;
1207 	attr->mmap     = track;
1208 	attr->mmap2    = track && !perf_missing_features.mmap2;
1209 	attr->comm     = track;
1210 	attr->build_id = track && opts->build_id;
1211 
1212 	/*
1213 	 * ksymbol is tracked separately with text poke because it needs to be
1214 	 * system wide and enabled immediately.
1215 	 */
1216 	if (!opts->text_poke)
1217 		attr->ksymbol = track && !perf_missing_features.ksymbol;
1218 	attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1219 
1220 	if (opts->record_namespaces)
1221 		attr->namespaces  = track;
1222 
1223 	if (opts->record_cgroup) {
1224 		attr->cgroup = track && !perf_missing_features.cgroup;
1225 		evsel__set_sample_bit(evsel, CGROUP);
1226 	}
1227 
1228 	if (opts->sample_data_page_size)
1229 		evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
1230 
1231 	if (opts->sample_code_page_size)
1232 		evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
1233 
1234 	if (opts->record_switch_events)
1235 		attr->context_switch = track;
1236 
1237 	if (opts->sample_transaction)
1238 		evsel__set_sample_bit(evsel, TRANSACTION);
1239 
1240 	if (opts->running_time) {
1241 		evsel->core.attr.read_format |=
1242 			PERF_FORMAT_TOTAL_TIME_ENABLED |
1243 			PERF_FORMAT_TOTAL_TIME_RUNNING;
1244 	}
1245 
1246 	/*
1247 	 * XXX see the function comment above
1248 	 *
1249 	 * Disabling only independent events or group leaders,
1250 	 * keeping group members enabled.
1251 	 */
1252 	if (evsel__is_group_leader(evsel))
1253 		attr->disabled = 1;
1254 
1255 	/*
1256 	 * Setting enable_on_exec for independent events and
1257 	 * group leaders for traced executed by perf.
1258 	 */
1259 	if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
1260 	    !opts->initial_delay)
1261 		attr->enable_on_exec = 1;
1262 
1263 	if (evsel->immediate) {
1264 		attr->disabled = 0;
1265 		attr->enable_on_exec = 0;
1266 	}
1267 
1268 	clockid = opts->clockid;
1269 	if (opts->use_clockid) {
1270 		attr->use_clockid = 1;
1271 		attr->clockid = opts->clockid;
1272 	}
1273 
1274 	if (evsel->precise_max)
1275 		attr->precise_ip = 3;
1276 
1277 	if (opts->all_user) {
1278 		attr->exclude_kernel = 1;
1279 		attr->exclude_user   = 0;
1280 	}
1281 
1282 	if (opts->all_kernel) {
1283 		attr->exclude_kernel = 0;
1284 		attr->exclude_user   = 1;
1285 	}
1286 
1287 	if (evsel->core.own_cpus || evsel->unit)
1288 		evsel->core.attr.read_format |= PERF_FORMAT_ID;
1289 
1290 	/*
1291 	 * Apply event specific term settings,
1292 	 * it overloads any global configuration.
1293 	 */
1294 	evsel__apply_config_terms(evsel, opts, track);
1295 
1296 	evsel->ignore_missing_thread = opts->ignore_missing_thread;
1297 
1298 	/* The --period option takes the precedence. */
1299 	if (opts->period_set) {
1300 		if (opts->period)
1301 			evsel__set_sample_bit(evsel, PERIOD);
1302 		else
1303 			evsel__reset_sample_bit(evsel, PERIOD);
1304 	}
1305 
1306 	/*
1307 	 * A dummy event never triggers any actual counter and therefore
1308 	 * cannot be used with branch_stack.
1309 	 *
1310 	 * For initial_delay, a dummy event is added implicitly.
1311 	 * The software event will trigger -EOPNOTSUPP error out,
1312 	 * if BRANCH_STACK bit is set.
1313 	 */
1314 	if (evsel__is_dummy_event(evsel))
1315 		evsel__reset_sample_bit(evsel, BRANCH_STACK);
1316 }
1317 
1318 int evsel__set_filter(struct evsel *evsel, const char *filter)
1319 {
1320 	char *new_filter = strdup(filter);
1321 
1322 	if (new_filter != NULL) {
1323 		free(evsel->filter);
1324 		evsel->filter = new_filter;
1325 		return 0;
1326 	}
1327 
1328 	return -1;
1329 }
1330 
1331 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
1332 {
1333 	char *new_filter;
1334 
1335 	if (evsel->filter == NULL)
1336 		return evsel__set_filter(evsel, filter);
1337 
1338 	if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1339 		free(evsel->filter);
1340 		evsel->filter = new_filter;
1341 		return 0;
1342 	}
1343 
1344 	return -1;
1345 }
1346 
1347 int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1348 {
1349 	return evsel__append_filter(evsel, "(%s) && (%s)", filter);
1350 }
1351 
1352 int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1353 {
1354 	return evsel__append_filter(evsel, "%s,%s", filter);
1355 }
1356 
1357 /* Caller has to clear disabled after going through all CPUs. */
1358 int evsel__enable_cpu(struct evsel *evsel, int cpu)
1359 {
1360 	return perf_evsel__enable_cpu(&evsel->core, cpu);
1361 }
1362 
1363 int evsel__enable(struct evsel *evsel)
1364 {
1365 	int err = perf_evsel__enable(&evsel->core);
1366 
1367 	if (!err)
1368 		evsel->disabled = false;
1369 	return err;
1370 }
1371 
1372 /* Caller has to set disabled after going through all CPUs. */
1373 int evsel__disable_cpu(struct evsel *evsel, int cpu)
1374 {
1375 	return perf_evsel__disable_cpu(&evsel->core, cpu);
1376 }
1377 
1378 int evsel__disable(struct evsel *evsel)
1379 {
1380 	int err = perf_evsel__disable(&evsel->core);
1381 	/*
1382 	 * We mark it disabled here so that tools that disable a event can
1383 	 * ignore events after they disable it. I.e. the ring buffer may have
1384 	 * already a few more events queued up before the kernel got the stop
1385 	 * request.
1386 	 */
1387 	if (!err)
1388 		evsel->disabled = true;
1389 
1390 	return err;
1391 }
1392 
1393 void free_config_terms(struct list_head *config_terms)
1394 {
1395 	struct evsel_config_term *term, *h;
1396 
1397 	list_for_each_entry_safe(term, h, config_terms, list) {
1398 		list_del_init(&term->list);
1399 		if (term->free_str)
1400 			zfree(&term->val.str);
1401 		free(term);
1402 	}
1403 }
1404 
1405 static void evsel__free_config_terms(struct evsel *evsel)
1406 {
1407 	free_config_terms(&evsel->config_terms);
1408 }
1409 
1410 void evsel__exit(struct evsel *evsel)
1411 {
1412 	assert(list_empty(&evsel->core.node));
1413 	assert(evsel->evlist == NULL);
1414 	bpf_counter__destroy(evsel);
1415 	evsel__free_counts(evsel);
1416 	perf_evsel__free_fd(&evsel->core);
1417 	perf_evsel__free_id(&evsel->core);
1418 	evsel__free_config_terms(evsel);
1419 	cgroup__put(evsel->cgrp);
1420 	perf_cpu_map__put(evsel->core.cpus);
1421 	perf_cpu_map__put(evsel->core.own_cpus);
1422 	perf_thread_map__put(evsel->core.threads);
1423 	zfree(&evsel->group_name);
1424 	zfree(&evsel->name);
1425 	zfree(&evsel->pmu_name);
1426 	evsel__zero_per_pkg(evsel);
1427 	hashmap__free(evsel->per_pkg_mask);
1428 	evsel->per_pkg_mask = NULL;
1429 	zfree(&evsel->metric_events);
1430 	perf_evsel__object.fini(evsel);
1431 }
1432 
1433 void evsel__delete(struct evsel *evsel)
1434 {
1435 	evsel__exit(evsel);
1436 	free(evsel);
1437 }
1438 
1439 void evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
1440 			   struct perf_counts_values *count)
1441 {
1442 	struct perf_counts_values tmp;
1443 
1444 	if (!evsel->prev_raw_counts)
1445 		return;
1446 
1447 	if (cpu == -1) {
1448 		tmp = evsel->prev_raw_counts->aggr;
1449 		evsel->prev_raw_counts->aggr = *count;
1450 	} else {
1451 		tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1452 		*perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1453 	}
1454 
1455 	count->val = count->val - tmp.val;
1456 	count->ena = count->ena - tmp.ena;
1457 	count->run = count->run - tmp.run;
1458 }
1459 
1460 void perf_counts_values__scale(struct perf_counts_values *count,
1461 			       bool scale, s8 *pscaled)
1462 {
1463 	s8 scaled = 0;
1464 
1465 	if (scale) {
1466 		if (count->run == 0) {
1467 			scaled = -1;
1468 			count->val = 0;
1469 		} else if (count->run < count->ena) {
1470 			scaled = 1;
1471 			count->val = (u64)((double) count->val * count->ena / count->run);
1472 		}
1473 	}
1474 
1475 	if (pscaled)
1476 		*pscaled = scaled;
1477 }
1478 
1479 static int evsel__read_one(struct evsel *evsel, int cpu, int thread)
1480 {
1481 	struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1482 
1483 	return perf_evsel__read(&evsel->core, cpu, thread, count);
1484 }
1485 
1486 static void evsel__set_count(struct evsel *counter, int cpu, int thread, u64 val, u64 ena, u64 run)
1487 {
1488 	struct perf_counts_values *count;
1489 
1490 	count = perf_counts(counter->counts, cpu, thread);
1491 
1492 	count->val    = val;
1493 	count->ena    = ena;
1494 	count->run    = run;
1495 
1496 	perf_counts__set_loaded(counter->counts, cpu, thread, true);
1497 }
1498 
1499 static int evsel__process_group_data(struct evsel *leader, int cpu, int thread, u64 *data)
1500 {
1501 	u64 read_format = leader->core.attr.read_format;
1502 	struct sample_read_value *v;
1503 	u64 nr, ena = 0, run = 0, i;
1504 
1505 	nr = *data++;
1506 
1507 	if (nr != (u64) leader->core.nr_members)
1508 		return -EINVAL;
1509 
1510 	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1511 		ena = *data++;
1512 
1513 	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1514 		run = *data++;
1515 
1516 	v = (struct sample_read_value *) data;
1517 
1518 	evsel__set_count(leader, cpu, thread, v[0].value, ena, run);
1519 
1520 	for (i = 1; i < nr; i++) {
1521 		struct evsel *counter;
1522 
1523 		counter = evlist__id2evsel(leader->evlist, v[i].id);
1524 		if (!counter)
1525 			return -EINVAL;
1526 
1527 		evsel__set_count(counter, cpu, thread, v[i].value, ena, run);
1528 	}
1529 
1530 	return 0;
1531 }
1532 
1533 static int evsel__read_group(struct evsel *leader, int cpu, int thread)
1534 {
1535 	struct perf_stat_evsel *ps = leader->stats;
1536 	u64 read_format = leader->core.attr.read_format;
1537 	int size = perf_evsel__read_size(&leader->core);
1538 	u64 *data = ps->group_data;
1539 
1540 	if (!(read_format & PERF_FORMAT_ID))
1541 		return -EINVAL;
1542 
1543 	if (!evsel__is_group_leader(leader))
1544 		return -EINVAL;
1545 
1546 	if (!data) {
1547 		data = zalloc(size);
1548 		if (!data)
1549 			return -ENOMEM;
1550 
1551 		ps->group_data = data;
1552 	}
1553 
1554 	if (FD(leader, cpu, thread) < 0)
1555 		return -EINVAL;
1556 
1557 	if (readn(FD(leader, cpu, thread), data, size) <= 0)
1558 		return -errno;
1559 
1560 	return evsel__process_group_data(leader, cpu, thread, data);
1561 }
1562 
1563 int evsel__read_counter(struct evsel *evsel, int cpu, int thread)
1564 {
1565 	u64 read_format = evsel->core.attr.read_format;
1566 
1567 	if (read_format & PERF_FORMAT_GROUP)
1568 		return evsel__read_group(evsel, cpu, thread);
1569 
1570 	return evsel__read_one(evsel, cpu, thread);
1571 }
1572 
1573 int __evsel__read_on_cpu(struct evsel *evsel, int cpu, int thread, bool scale)
1574 {
1575 	struct perf_counts_values count;
1576 	size_t nv = scale ? 3 : 1;
1577 
1578 	if (FD(evsel, cpu, thread) < 0)
1579 		return -EINVAL;
1580 
1581 	if (evsel->counts == NULL && evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1582 		return -ENOMEM;
1583 
1584 	if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1585 		return -errno;
1586 
1587 	evsel__compute_deltas(evsel, cpu, thread, &count);
1588 	perf_counts_values__scale(&count, scale, NULL);
1589 	*perf_counts(evsel->counts, cpu, thread) = count;
1590 	return 0;
1591 }
1592 
1593 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other,
1594 				  int cpu)
1595 {
1596 	int cpuid;
1597 
1598 	cpuid = perf_cpu_map__cpu(evsel->core.cpus, cpu);
1599 	return perf_cpu_map__idx(other->core.cpus, cpuid);
1600 }
1601 
1602 static int evsel__hybrid_group_cpu(struct evsel *evsel, int cpu)
1603 {
1604 	struct evsel *leader = evsel__leader(evsel);
1605 
1606 	if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) ||
1607 	    (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) {
1608 		return evsel__match_other_cpu(evsel, leader, cpu);
1609 	}
1610 
1611 	return cpu;
1612 }
1613 
1614 static int get_group_fd(struct evsel *evsel, int cpu, int thread)
1615 {
1616 	struct evsel *leader = evsel__leader(evsel);
1617 	int fd;
1618 
1619 	if (evsel__is_group_leader(evsel))
1620 		return -1;
1621 
1622 	/*
1623 	 * Leader must be already processed/open,
1624 	 * if not it's a bug.
1625 	 */
1626 	BUG_ON(!leader->core.fd);
1627 
1628 	cpu = evsel__hybrid_group_cpu(evsel, cpu);
1629 	if (cpu == -1)
1630 		return -1;
1631 
1632 	fd = FD(leader, cpu, thread);
1633 	BUG_ON(fd == -1);
1634 
1635 	return fd;
1636 }
1637 
1638 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx)
1639 {
1640 	for (int cpu = 0; cpu < nr_cpus; cpu++)
1641 		for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1642 			FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1643 }
1644 
1645 static int update_fds(struct evsel *evsel,
1646 		      int nr_cpus, int cpu_idx,
1647 		      int nr_threads, int thread_idx)
1648 {
1649 	struct evsel *pos;
1650 
1651 	if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1652 		return -EINVAL;
1653 
1654 	evlist__for_each_entry(evsel->evlist, pos) {
1655 		nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1656 
1657 		evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1658 
1659 		/*
1660 		 * Since fds for next evsel has not been created,
1661 		 * there is no need to iterate whole event list.
1662 		 */
1663 		if (pos == evsel)
1664 			break;
1665 	}
1666 	return 0;
1667 }
1668 
1669 bool evsel__ignore_missing_thread(struct evsel *evsel,
1670 				  int nr_cpus, int cpu,
1671 				  struct perf_thread_map *threads,
1672 				  int thread, int err)
1673 {
1674 	pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1675 
1676 	if (!evsel->ignore_missing_thread)
1677 		return false;
1678 
1679 	/* The system wide setup does not work with threads. */
1680 	if (evsel->core.system_wide)
1681 		return false;
1682 
1683 	/* The -ESRCH is perf event syscall errno for pid's not found. */
1684 	if (err != -ESRCH)
1685 		return false;
1686 
1687 	/* If there's only one thread, let it fail. */
1688 	if (threads->nr == 1)
1689 		return false;
1690 
1691 	/*
1692 	 * We should remove fd for missing_thread first
1693 	 * because thread_map__remove() will decrease threads->nr.
1694 	 */
1695 	if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1696 		return false;
1697 
1698 	if (thread_map__remove(threads, thread))
1699 		return false;
1700 
1701 	pr_warning("WARNING: Ignored open failure for pid %d\n",
1702 		   ignore_pid);
1703 	return true;
1704 }
1705 
1706 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1707 				void *priv __maybe_unused)
1708 {
1709 	return fprintf(fp, "  %-32s %s\n", name, val);
1710 }
1711 
1712 static void display_attr(struct perf_event_attr *attr)
1713 {
1714 	if (verbose >= 2 || debug_peo_args) {
1715 		fprintf(stderr, "%.60s\n", graph_dotted_line);
1716 		fprintf(stderr, "perf_event_attr:\n");
1717 		perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1718 		fprintf(stderr, "%.60s\n", graph_dotted_line);
1719 	}
1720 }
1721 
1722 bool evsel__precise_ip_fallback(struct evsel *evsel)
1723 {
1724 	/* Do not try less precise if not requested. */
1725 	if (!evsel->precise_max)
1726 		return false;
1727 
1728 	/*
1729 	 * We tried all the precise_ip values, and it's
1730 	 * still failing, so leave it to standard fallback.
1731 	 */
1732 	if (!evsel->core.attr.precise_ip) {
1733 		evsel->core.attr.precise_ip = evsel->precise_ip_original;
1734 		return false;
1735 	}
1736 
1737 	if (!evsel->precise_ip_original)
1738 		evsel->precise_ip_original = evsel->core.attr.precise_ip;
1739 
1740 	evsel->core.attr.precise_ip--;
1741 	pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1742 	display_attr(&evsel->core.attr);
1743 	return true;
1744 }
1745 
1746 static struct perf_cpu_map *empty_cpu_map;
1747 static struct perf_thread_map *empty_thread_map;
1748 
1749 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
1750 		struct perf_thread_map *threads)
1751 {
1752 	int nthreads;
1753 
1754 	if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1755 	    (perf_missing_features.aux_output     && evsel->core.attr.aux_output))
1756 		return -EINVAL;
1757 
1758 	if (cpus == NULL) {
1759 		if (empty_cpu_map == NULL) {
1760 			empty_cpu_map = perf_cpu_map__dummy_new();
1761 			if (empty_cpu_map == NULL)
1762 				return -ENOMEM;
1763 		}
1764 
1765 		cpus = empty_cpu_map;
1766 	}
1767 
1768 	if (threads == NULL) {
1769 		if (empty_thread_map == NULL) {
1770 			empty_thread_map = thread_map__new_by_tid(-1);
1771 			if (empty_thread_map == NULL)
1772 				return -ENOMEM;
1773 		}
1774 
1775 		threads = empty_thread_map;
1776 	}
1777 
1778 	if (evsel->core.system_wide)
1779 		nthreads = 1;
1780 	else
1781 		nthreads = threads->nr;
1782 
1783 	if (evsel->core.fd == NULL &&
1784 	    perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
1785 		return -ENOMEM;
1786 
1787 	evsel->open_flags = PERF_FLAG_FD_CLOEXEC;
1788 	if (evsel->cgrp)
1789 		evsel->open_flags |= PERF_FLAG_PID_CGROUP;
1790 
1791 	return 0;
1792 }
1793 
1794 static void evsel__disable_missing_features(struct evsel *evsel)
1795 {
1796 	if (perf_missing_features.weight_struct) {
1797 		evsel__set_sample_bit(evsel, WEIGHT);
1798 		evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
1799 	}
1800 	if (perf_missing_features.clockid_wrong)
1801 		evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1802 	if (perf_missing_features.clockid) {
1803 		evsel->core.attr.use_clockid = 0;
1804 		evsel->core.attr.clockid = 0;
1805 	}
1806 	if (perf_missing_features.cloexec)
1807 		evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1808 	if (perf_missing_features.mmap2)
1809 		evsel->core.attr.mmap2 = 0;
1810 	if (perf_missing_features.exclude_guest)
1811 		evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1812 	if (perf_missing_features.lbr_flags)
1813 		evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1814 				     PERF_SAMPLE_BRANCH_NO_CYCLES);
1815 	if (perf_missing_features.group_read && evsel->core.attr.inherit)
1816 		evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1817 	if (perf_missing_features.ksymbol)
1818 		evsel->core.attr.ksymbol = 0;
1819 	if (perf_missing_features.bpf)
1820 		evsel->core.attr.bpf_event = 0;
1821 	if (perf_missing_features.branch_hw_idx)
1822 		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
1823 	if (perf_missing_features.sample_id_all)
1824 		evsel->core.attr.sample_id_all = 0;
1825 }
1826 
1827 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
1828 			struct perf_thread_map *threads)
1829 {
1830 	int err;
1831 
1832 	err = __evsel__prepare_open(evsel, cpus, threads);
1833 	if (err)
1834 		return err;
1835 
1836 	evsel__disable_missing_features(evsel);
1837 
1838 	return err;
1839 }
1840 
1841 bool evsel__detect_missing_features(struct evsel *evsel)
1842 {
1843 	/*
1844 	 * Must probe features in the order they were added to the
1845 	 * perf_event_attr interface.
1846 	 */
1847 	if (!perf_missing_features.weight_struct &&
1848 	    (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) {
1849 		perf_missing_features.weight_struct = true;
1850 		pr_debug2("switching off weight struct support\n");
1851 		return true;
1852 	} else if (!perf_missing_features.code_page_size &&
1853 	    (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) {
1854 		perf_missing_features.code_page_size = true;
1855 		pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n");
1856 		return false;
1857 	} else if (!perf_missing_features.data_page_size &&
1858 	    (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) {
1859 		perf_missing_features.data_page_size = true;
1860 		pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n");
1861 		return false;
1862 	} else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
1863 		perf_missing_features.cgroup = true;
1864 		pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
1865 		return false;
1866 	} else if (!perf_missing_features.branch_hw_idx &&
1867 	    (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
1868 		perf_missing_features.branch_hw_idx = true;
1869 		pr_debug2("switching off branch HW index support\n");
1870 		return true;
1871 	} else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1872 		perf_missing_features.aux_output = true;
1873 		pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
1874 		return false;
1875 	} else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1876 		perf_missing_features.bpf = true;
1877 		pr_debug2_peo("switching off bpf_event\n");
1878 		return true;
1879 	} else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1880 		perf_missing_features.ksymbol = true;
1881 		pr_debug2_peo("switching off ksymbol\n");
1882 		return true;
1883 	} else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1884 		perf_missing_features.write_backward = true;
1885 		pr_debug2_peo("switching off write_backward\n");
1886 		return false;
1887 	} else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1888 		perf_missing_features.clockid_wrong = true;
1889 		pr_debug2_peo("switching off clockid\n");
1890 		return true;
1891 	} else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1892 		perf_missing_features.clockid = true;
1893 		pr_debug2_peo("switching off use_clockid\n");
1894 		return true;
1895 	} else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) {
1896 		perf_missing_features.cloexec = true;
1897 		pr_debug2_peo("switching off cloexec flag\n");
1898 		return true;
1899 	} else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1900 		perf_missing_features.mmap2 = true;
1901 		pr_debug2_peo("switching off mmap2\n");
1902 		return true;
1903 	} else if (!perf_missing_features.exclude_guest &&
1904 		   (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
1905 		perf_missing_features.exclude_guest = true;
1906 		pr_debug2_peo("switching off exclude_guest, exclude_host\n");
1907 		return true;
1908 	} else if (!perf_missing_features.sample_id_all) {
1909 		perf_missing_features.sample_id_all = true;
1910 		pr_debug2_peo("switching off sample_id_all\n");
1911 		return true;
1912 	} else if (!perf_missing_features.lbr_flags &&
1913 			(evsel->core.attr.branch_sample_type &
1914 			 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1915 			  PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1916 		perf_missing_features.lbr_flags = true;
1917 		pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
1918 		return true;
1919 	} else if (!perf_missing_features.group_read &&
1920 		    evsel->core.attr.inherit &&
1921 		   (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1922 		   evsel__is_group_leader(evsel)) {
1923 		perf_missing_features.group_read = true;
1924 		pr_debug2_peo("switching off group read\n");
1925 		return true;
1926 	} else {
1927 		return false;
1928 	}
1929 }
1930 
1931 bool evsel__increase_rlimit(enum rlimit_action *set_rlimit)
1932 {
1933 	int old_errno;
1934 	struct rlimit l;
1935 
1936 	if (*set_rlimit < INCREASED_MAX) {
1937 		old_errno = errno;
1938 
1939 		if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1940 			if (*set_rlimit == NO_CHANGE) {
1941 				l.rlim_cur = l.rlim_max;
1942 			} else {
1943 				l.rlim_cur = l.rlim_max + 1000;
1944 				l.rlim_max = l.rlim_cur;
1945 			}
1946 			if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1947 				(*set_rlimit) += 1;
1948 				errno = old_errno;
1949 				return true;
1950 			}
1951 		}
1952 		errno = old_errno;
1953 	}
1954 
1955 	return false;
1956 }
1957 
1958 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
1959 		struct perf_thread_map *threads,
1960 		int start_cpu, int end_cpu)
1961 {
1962 	int cpu, thread, nthreads;
1963 	int pid = -1, err, old_errno;
1964 	enum rlimit_action set_rlimit = NO_CHANGE;
1965 
1966 	err = __evsel__prepare_open(evsel, cpus, threads);
1967 	if (err)
1968 		return err;
1969 
1970 	if (cpus == NULL)
1971 		cpus = empty_cpu_map;
1972 
1973 	if (threads == NULL)
1974 		threads = empty_thread_map;
1975 
1976 	if (evsel->core.system_wide)
1977 		nthreads = 1;
1978 	else
1979 		nthreads = threads->nr;
1980 
1981 	if (evsel->cgrp)
1982 		pid = evsel->cgrp->fd;
1983 
1984 fallback_missing_features:
1985 	evsel__disable_missing_features(evsel);
1986 
1987 	display_attr(&evsel->core.attr);
1988 
1989 	for (cpu = start_cpu; cpu < end_cpu; cpu++) {
1990 
1991 		for (thread = 0; thread < nthreads; thread++) {
1992 			int fd, group_fd;
1993 retry_open:
1994 			if (thread >= nthreads)
1995 				break;
1996 
1997 			if (!evsel->cgrp && !evsel->core.system_wide)
1998 				pid = perf_thread_map__pid(threads, thread);
1999 
2000 			group_fd = get_group_fd(evsel, cpu, thread);
2001 
2002 			test_attr__ready();
2003 
2004 			pr_debug2_peo("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
2005 				pid, cpus->map[cpu], group_fd, evsel->open_flags);
2006 
2007 			fd = sys_perf_event_open(&evsel->core.attr, pid, cpus->map[cpu],
2008 						group_fd, evsel->open_flags);
2009 
2010 			FD(evsel, cpu, thread) = fd;
2011 
2012 			if (fd < 0) {
2013 				err = -errno;
2014 
2015 				pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
2016 					  err);
2017 				goto try_fallback;
2018 			}
2019 
2020 			bpf_counter__install_pe(evsel, cpu, fd);
2021 
2022 			if (unlikely(test_attr__enabled)) {
2023 				test_attr__open(&evsel->core.attr, pid, cpus->map[cpu],
2024 						fd, group_fd, evsel->open_flags);
2025 			}
2026 
2027 			pr_debug2_peo(" = %d\n", fd);
2028 
2029 			if (evsel->bpf_fd >= 0) {
2030 				int evt_fd = fd;
2031 				int bpf_fd = evsel->bpf_fd;
2032 
2033 				err = ioctl(evt_fd,
2034 					    PERF_EVENT_IOC_SET_BPF,
2035 					    bpf_fd);
2036 				if (err && errno != EEXIST) {
2037 					pr_err("failed to attach bpf fd %d: %s\n",
2038 					       bpf_fd, strerror(errno));
2039 					err = -EINVAL;
2040 					goto out_close;
2041 				}
2042 			}
2043 
2044 			set_rlimit = NO_CHANGE;
2045 
2046 			/*
2047 			 * If we succeeded but had to kill clockid, fail and
2048 			 * have evsel__open_strerror() print us a nice error.
2049 			 */
2050 			if (perf_missing_features.clockid ||
2051 			    perf_missing_features.clockid_wrong) {
2052 				err = -EINVAL;
2053 				goto out_close;
2054 			}
2055 		}
2056 	}
2057 
2058 	return 0;
2059 
2060 try_fallback:
2061 	if (evsel__precise_ip_fallback(evsel))
2062 		goto retry_open;
2063 
2064 	if (evsel__ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
2065 		/* We just removed 1 thread, so lower the upper nthreads limit. */
2066 		nthreads--;
2067 
2068 		/* ... and pretend like nothing have happened. */
2069 		err = 0;
2070 		goto retry_open;
2071 	}
2072 	/*
2073 	 * perf stat needs between 5 and 22 fds per CPU. When we run out
2074 	 * of them try to increase the limits.
2075 	 */
2076 	if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit))
2077 		goto retry_open;
2078 
2079 	if (err != -EINVAL || cpu > 0 || thread > 0)
2080 		goto out_close;
2081 
2082 	if (evsel__detect_missing_features(evsel))
2083 		goto fallback_missing_features;
2084 out_close:
2085 	if (err)
2086 		threads->err_thread = thread;
2087 
2088 	old_errno = errno;
2089 	do {
2090 		while (--thread >= 0) {
2091 			if (FD(evsel, cpu, thread) >= 0)
2092 				close(FD(evsel, cpu, thread));
2093 			FD(evsel, cpu, thread) = -1;
2094 		}
2095 		thread = nthreads;
2096 	} while (--cpu >= 0);
2097 	errno = old_errno;
2098 	return err;
2099 }
2100 
2101 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
2102 		struct perf_thread_map *threads)
2103 {
2104 	return evsel__open_cpu(evsel, cpus, threads, 0, cpus ? cpus->nr : 1);
2105 }
2106 
2107 void evsel__close(struct evsel *evsel)
2108 {
2109 	perf_evsel__close(&evsel->core);
2110 	perf_evsel__free_id(&evsel->core);
2111 }
2112 
2113 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu)
2114 {
2115 	if (cpu == -1)
2116 		return evsel__open_cpu(evsel, cpus, NULL, 0,
2117 					cpus ? cpus->nr : 1);
2118 
2119 	return evsel__open_cpu(evsel, cpus, NULL, cpu, cpu + 1);
2120 }
2121 
2122 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
2123 {
2124 	return evsel__open(evsel, NULL, threads);
2125 }
2126 
2127 static int perf_evsel__parse_id_sample(const struct evsel *evsel,
2128 				       const union perf_event *event,
2129 				       struct perf_sample *sample)
2130 {
2131 	u64 type = evsel->core.attr.sample_type;
2132 	const __u64 *array = event->sample.array;
2133 	bool swapped = evsel->needs_swap;
2134 	union u64_swap u;
2135 
2136 	array += ((event->header.size -
2137 		   sizeof(event->header)) / sizeof(u64)) - 1;
2138 
2139 	if (type & PERF_SAMPLE_IDENTIFIER) {
2140 		sample->id = *array;
2141 		array--;
2142 	}
2143 
2144 	if (type & PERF_SAMPLE_CPU) {
2145 		u.val64 = *array;
2146 		if (swapped) {
2147 			/* undo swap of u64, then swap on individual u32s */
2148 			u.val64 = bswap_64(u.val64);
2149 			u.val32[0] = bswap_32(u.val32[0]);
2150 		}
2151 
2152 		sample->cpu = u.val32[0];
2153 		array--;
2154 	}
2155 
2156 	if (type & PERF_SAMPLE_STREAM_ID) {
2157 		sample->stream_id = *array;
2158 		array--;
2159 	}
2160 
2161 	if (type & PERF_SAMPLE_ID) {
2162 		sample->id = *array;
2163 		array--;
2164 	}
2165 
2166 	if (type & PERF_SAMPLE_TIME) {
2167 		sample->time = *array;
2168 		array--;
2169 	}
2170 
2171 	if (type & PERF_SAMPLE_TID) {
2172 		u.val64 = *array;
2173 		if (swapped) {
2174 			/* undo swap of u64, then swap on individual u32s */
2175 			u.val64 = bswap_64(u.val64);
2176 			u.val32[0] = bswap_32(u.val32[0]);
2177 			u.val32[1] = bswap_32(u.val32[1]);
2178 		}
2179 
2180 		sample->pid = u.val32[0];
2181 		sample->tid = u.val32[1];
2182 		array--;
2183 	}
2184 
2185 	return 0;
2186 }
2187 
2188 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2189 			    u64 size)
2190 {
2191 	return size > max_size || offset + size > endp;
2192 }
2193 
2194 #define OVERFLOW_CHECK(offset, size, max_size)				\
2195 	do {								\
2196 		if (overflow(endp, (max_size), (offset), (size)))	\
2197 			return -EFAULT;					\
2198 	} while (0)
2199 
2200 #define OVERFLOW_CHECK_u64(offset) \
2201 	OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2202 
2203 static int
2204 perf_event__check_size(union perf_event *event, unsigned int sample_size)
2205 {
2206 	/*
2207 	 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2208 	 * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
2209 	 * check the format does not go past the end of the event.
2210 	 */
2211 	if (sample_size + sizeof(event->header) > event->header.size)
2212 		return -EFAULT;
2213 
2214 	return 0;
2215 }
2216 
2217 void __weak arch_perf_parse_sample_weight(struct perf_sample *data,
2218 					  const __u64 *array,
2219 					  u64 type __maybe_unused)
2220 {
2221 	data->weight = *array;
2222 }
2223 
2224 int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
2225 			struct perf_sample *data)
2226 {
2227 	u64 type = evsel->core.attr.sample_type;
2228 	bool swapped = evsel->needs_swap;
2229 	const __u64 *array;
2230 	u16 max_size = event->header.size;
2231 	const void *endp = (void *)event + max_size;
2232 	u64 sz;
2233 
2234 	/*
2235 	 * used for cross-endian analysis. See git commit 65014ab3
2236 	 * for why this goofiness is needed.
2237 	 */
2238 	union u64_swap u;
2239 
2240 	memset(data, 0, sizeof(*data));
2241 	data->cpu = data->pid = data->tid = -1;
2242 	data->stream_id = data->id = data->time = -1ULL;
2243 	data->period = evsel->core.attr.sample_period;
2244 	data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2245 	data->misc    = event->header.misc;
2246 	data->id = -1ULL;
2247 	data->data_src = PERF_MEM_DATA_SRC_NONE;
2248 
2249 	if (event->header.type != PERF_RECORD_SAMPLE) {
2250 		if (!evsel->core.attr.sample_id_all)
2251 			return 0;
2252 		return perf_evsel__parse_id_sample(evsel, event, data);
2253 	}
2254 
2255 	array = event->sample.array;
2256 
2257 	if (perf_event__check_size(event, evsel->sample_size))
2258 		return -EFAULT;
2259 
2260 	if (type & PERF_SAMPLE_IDENTIFIER) {
2261 		data->id = *array;
2262 		array++;
2263 	}
2264 
2265 	if (type & PERF_SAMPLE_IP) {
2266 		data->ip = *array;
2267 		array++;
2268 	}
2269 
2270 	if (type & PERF_SAMPLE_TID) {
2271 		u.val64 = *array;
2272 		if (swapped) {
2273 			/* undo swap of u64, then swap on individual u32s */
2274 			u.val64 = bswap_64(u.val64);
2275 			u.val32[0] = bswap_32(u.val32[0]);
2276 			u.val32[1] = bswap_32(u.val32[1]);
2277 		}
2278 
2279 		data->pid = u.val32[0];
2280 		data->tid = u.val32[1];
2281 		array++;
2282 	}
2283 
2284 	if (type & PERF_SAMPLE_TIME) {
2285 		data->time = *array;
2286 		array++;
2287 	}
2288 
2289 	if (type & PERF_SAMPLE_ADDR) {
2290 		data->addr = *array;
2291 		array++;
2292 	}
2293 
2294 	if (type & PERF_SAMPLE_ID) {
2295 		data->id = *array;
2296 		array++;
2297 	}
2298 
2299 	if (type & PERF_SAMPLE_STREAM_ID) {
2300 		data->stream_id = *array;
2301 		array++;
2302 	}
2303 
2304 	if (type & PERF_SAMPLE_CPU) {
2305 
2306 		u.val64 = *array;
2307 		if (swapped) {
2308 			/* undo swap of u64, then swap on individual u32s */
2309 			u.val64 = bswap_64(u.val64);
2310 			u.val32[0] = bswap_32(u.val32[0]);
2311 		}
2312 
2313 		data->cpu = u.val32[0];
2314 		array++;
2315 	}
2316 
2317 	if (type & PERF_SAMPLE_PERIOD) {
2318 		data->period = *array;
2319 		array++;
2320 	}
2321 
2322 	if (type & PERF_SAMPLE_READ) {
2323 		u64 read_format = evsel->core.attr.read_format;
2324 
2325 		OVERFLOW_CHECK_u64(array);
2326 		if (read_format & PERF_FORMAT_GROUP)
2327 			data->read.group.nr = *array;
2328 		else
2329 			data->read.one.value = *array;
2330 
2331 		array++;
2332 
2333 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2334 			OVERFLOW_CHECK_u64(array);
2335 			data->read.time_enabled = *array;
2336 			array++;
2337 		}
2338 
2339 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2340 			OVERFLOW_CHECK_u64(array);
2341 			data->read.time_running = *array;
2342 			array++;
2343 		}
2344 
2345 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2346 		if (read_format & PERF_FORMAT_GROUP) {
2347 			const u64 max_group_nr = UINT64_MAX /
2348 					sizeof(struct sample_read_value);
2349 
2350 			if (data->read.group.nr > max_group_nr)
2351 				return -EFAULT;
2352 			sz = data->read.group.nr *
2353 			     sizeof(struct sample_read_value);
2354 			OVERFLOW_CHECK(array, sz, max_size);
2355 			data->read.group.values =
2356 					(struct sample_read_value *)array;
2357 			array = (void *)array + sz;
2358 		} else {
2359 			OVERFLOW_CHECK_u64(array);
2360 			data->read.one.id = *array;
2361 			array++;
2362 		}
2363 	}
2364 
2365 	if (type & PERF_SAMPLE_CALLCHAIN) {
2366 		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2367 
2368 		OVERFLOW_CHECK_u64(array);
2369 		data->callchain = (struct ip_callchain *)array++;
2370 		if (data->callchain->nr > max_callchain_nr)
2371 			return -EFAULT;
2372 		sz = data->callchain->nr * sizeof(u64);
2373 		OVERFLOW_CHECK(array, sz, max_size);
2374 		array = (void *)array + sz;
2375 	}
2376 
2377 	if (type & PERF_SAMPLE_RAW) {
2378 		OVERFLOW_CHECK_u64(array);
2379 		u.val64 = *array;
2380 
2381 		/*
2382 		 * Undo swap of u64, then swap on individual u32s,
2383 		 * get the size of the raw area and undo all of the
2384 		 * swap. The pevent interface handles endianness by
2385 		 * itself.
2386 		 */
2387 		if (swapped) {
2388 			u.val64 = bswap_64(u.val64);
2389 			u.val32[0] = bswap_32(u.val32[0]);
2390 			u.val32[1] = bswap_32(u.val32[1]);
2391 		}
2392 		data->raw_size = u.val32[0];
2393 
2394 		/*
2395 		 * The raw data is aligned on 64bits including the
2396 		 * u32 size, so it's safe to use mem_bswap_64.
2397 		 */
2398 		if (swapped)
2399 			mem_bswap_64((void *) array, data->raw_size);
2400 
2401 		array = (void *)array + sizeof(u32);
2402 
2403 		OVERFLOW_CHECK(array, data->raw_size, max_size);
2404 		data->raw_data = (void *)array;
2405 		array = (void *)array + data->raw_size;
2406 	}
2407 
2408 	if (type & PERF_SAMPLE_BRANCH_STACK) {
2409 		const u64 max_branch_nr = UINT64_MAX /
2410 					  sizeof(struct branch_entry);
2411 
2412 		OVERFLOW_CHECK_u64(array);
2413 		data->branch_stack = (struct branch_stack *)array++;
2414 
2415 		if (data->branch_stack->nr > max_branch_nr)
2416 			return -EFAULT;
2417 
2418 		sz = data->branch_stack->nr * sizeof(struct branch_entry);
2419 		if (evsel__has_branch_hw_idx(evsel))
2420 			sz += sizeof(u64);
2421 		else
2422 			data->no_hw_idx = true;
2423 		OVERFLOW_CHECK(array, sz, max_size);
2424 		array = (void *)array + sz;
2425 	}
2426 
2427 	if (type & PERF_SAMPLE_REGS_USER) {
2428 		OVERFLOW_CHECK_u64(array);
2429 		data->user_regs.abi = *array;
2430 		array++;
2431 
2432 		if (data->user_regs.abi) {
2433 			u64 mask = evsel->core.attr.sample_regs_user;
2434 
2435 			sz = hweight64(mask) * sizeof(u64);
2436 			OVERFLOW_CHECK(array, sz, max_size);
2437 			data->user_regs.mask = mask;
2438 			data->user_regs.regs = (u64 *)array;
2439 			array = (void *)array + sz;
2440 		}
2441 	}
2442 
2443 	if (type & PERF_SAMPLE_STACK_USER) {
2444 		OVERFLOW_CHECK_u64(array);
2445 		sz = *array++;
2446 
2447 		data->user_stack.offset = ((char *)(array - 1)
2448 					  - (char *) event);
2449 
2450 		if (!sz) {
2451 			data->user_stack.size = 0;
2452 		} else {
2453 			OVERFLOW_CHECK(array, sz, max_size);
2454 			data->user_stack.data = (char *)array;
2455 			array = (void *)array + sz;
2456 			OVERFLOW_CHECK_u64(array);
2457 			data->user_stack.size = *array++;
2458 			if (WARN_ONCE(data->user_stack.size > sz,
2459 				      "user stack dump failure\n"))
2460 				return -EFAULT;
2461 		}
2462 	}
2463 
2464 	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
2465 		OVERFLOW_CHECK_u64(array);
2466 		arch_perf_parse_sample_weight(data, array, type);
2467 		array++;
2468 	}
2469 
2470 	if (type & PERF_SAMPLE_DATA_SRC) {
2471 		OVERFLOW_CHECK_u64(array);
2472 		data->data_src = *array;
2473 		array++;
2474 	}
2475 
2476 	if (type & PERF_SAMPLE_TRANSACTION) {
2477 		OVERFLOW_CHECK_u64(array);
2478 		data->transaction = *array;
2479 		array++;
2480 	}
2481 
2482 	data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2483 	if (type & PERF_SAMPLE_REGS_INTR) {
2484 		OVERFLOW_CHECK_u64(array);
2485 		data->intr_regs.abi = *array;
2486 		array++;
2487 
2488 		if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2489 			u64 mask = evsel->core.attr.sample_regs_intr;
2490 
2491 			sz = hweight64(mask) * sizeof(u64);
2492 			OVERFLOW_CHECK(array, sz, max_size);
2493 			data->intr_regs.mask = mask;
2494 			data->intr_regs.regs = (u64 *)array;
2495 			array = (void *)array + sz;
2496 		}
2497 	}
2498 
2499 	data->phys_addr = 0;
2500 	if (type & PERF_SAMPLE_PHYS_ADDR) {
2501 		data->phys_addr = *array;
2502 		array++;
2503 	}
2504 
2505 	data->cgroup = 0;
2506 	if (type & PERF_SAMPLE_CGROUP) {
2507 		data->cgroup = *array;
2508 		array++;
2509 	}
2510 
2511 	data->data_page_size = 0;
2512 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
2513 		data->data_page_size = *array;
2514 		array++;
2515 	}
2516 
2517 	data->code_page_size = 0;
2518 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
2519 		data->code_page_size = *array;
2520 		array++;
2521 	}
2522 
2523 	if (type & PERF_SAMPLE_AUX) {
2524 		OVERFLOW_CHECK_u64(array);
2525 		sz = *array++;
2526 
2527 		OVERFLOW_CHECK(array, sz, max_size);
2528 		/* Undo swap of data */
2529 		if (swapped)
2530 			mem_bswap_64((char *)array, sz);
2531 		data->aux_sample.size = sz;
2532 		data->aux_sample.data = (char *)array;
2533 		array = (void *)array + sz;
2534 	}
2535 
2536 	return 0;
2537 }
2538 
2539 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
2540 				  u64 *timestamp)
2541 {
2542 	u64 type = evsel->core.attr.sample_type;
2543 	const __u64 *array;
2544 
2545 	if (!(type & PERF_SAMPLE_TIME))
2546 		return -1;
2547 
2548 	if (event->header.type != PERF_RECORD_SAMPLE) {
2549 		struct perf_sample data = {
2550 			.time = -1ULL,
2551 		};
2552 
2553 		if (!evsel->core.attr.sample_id_all)
2554 			return -1;
2555 		if (perf_evsel__parse_id_sample(evsel, event, &data))
2556 			return -1;
2557 
2558 		*timestamp = data.time;
2559 		return 0;
2560 	}
2561 
2562 	array = event->sample.array;
2563 
2564 	if (perf_event__check_size(event, evsel->sample_size))
2565 		return -EFAULT;
2566 
2567 	if (type & PERF_SAMPLE_IDENTIFIER)
2568 		array++;
2569 
2570 	if (type & PERF_SAMPLE_IP)
2571 		array++;
2572 
2573 	if (type & PERF_SAMPLE_TID)
2574 		array++;
2575 
2576 	if (type & PERF_SAMPLE_TIME)
2577 		*timestamp = *array;
2578 
2579 	return 0;
2580 }
2581 
2582 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
2583 {
2584 	return tep_find_field(evsel->tp_format, name);
2585 }
2586 
2587 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name)
2588 {
2589 	struct tep_format_field *field = evsel__field(evsel, name);
2590 	int offset;
2591 
2592 	if (!field)
2593 		return NULL;
2594 
2595 	offset = field->offset;
2596 
2597 	if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2598 		offset = *(int *)(sample->raw_data + field->offset);
2599 		offset &= 0xffff;
2600 	}
2601 
2602 	return sample->raw_data + offset;
2603 }
2604 
2605 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2606 			 bool needs_swap)
2607 {
2608 	u64 value;
2609 	void *ptr = sample->raw_data + field->offset;
2610 
2611 	switch (field->size) {
2612 	case 1:
2613 		return *(u8 *)ptr;
2614 	case 2:
2615 		value = *(u16 *)ptr;
2616 		break;
2617 	case 4:
2618 		value = *(u32 *)ptr;
2619 		break;
2620 	case 8:
2621 		memcpy(&value, ptr, sizeof(u64));
2622 		break;
2623 	default:
2624 		return 0;
2625 	}
2626 
2627 	if (!needs_swap)
2628 		return value;
2629 
2630 	switch (field->size) {
2631 	case 2:
2632 		return bswap_16(value);
2633 	case 4:
2634 		return bswap_32(value);
2635 	case 8:
2636 		return bswap_64(value);
2637 	default:
2638 		return 0;
2639 	}
2640 
2641 	return 0;
2642 }
2643 
2644 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name)
2645 {
2646 	struct tep_format_field *field = evsel__field(evsel, name);
2647 
2648 	if (!field)
2649 		return 0;
2650 
2651 	return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2652 }
2653 
2654 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize)
2655 {
2656 	int paranoid;
2657 
2658 	if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2659 	    evsel->core.attr.type   == PERF_TYPE_HARDWARE &&
2660 	    evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2661 		/*
2662 		 * If it's cycles then fall back to hrtimer based
2663 		 * cpu-clock-tick sw counter, which is always available even if
2664 		 * no PMU support.
2665 		 *
2666 		 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2667 		 * b0a873e).
2668 		 */
2669 		scnprintf(msg, msgsize, "%s",
2670 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2671 
2672 		evsel->core.attr.type   = PERF_TYPE_SOFTWARE;
2673 		evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
2674 
2675 		zfree(&evsel->name);
2676 		return true;
2677 	} else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2678 		   (paranoid = perf_event_paranoid()) > 1) {
2679 		const char *name = evsel__name(evsel);
2680 		char *new_name;
2681 		const char *sep = ":";
2682 
2683 		/* If event has exclude user then don't exclude kernel. */
2684 		if (evsel->core.attr.exclude_user)
2685 			return false;
2686 
2687 		/* Is there already the separator in the name. */
2688 		if (strchr(name, '/') ||
2689 		    (strchr(name, ':') && !evsel->is_libpfm_event))
2690 			sep = "";
2691 
2692 		if (asprintf(&new_name, "%s%su", name, sep) < 0)
2693 			return false;
2694 
2695 		if (evsel->name)
2696 			free(evsel->name);
2697 		evsel->name = new_name;
2698 		scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2699 			  "to fall back to excluding kernel and hypervisor "
2700 			  " samples", paranoid);
2701 		evsel->core.attr.exclude_kernel = 1;
2702 		evsel->core.attr.exclude_hv     = 1;
2703 
2704 		return true;
2705 	}
2706 
2707 	return false;
2708 }
2709 
2710 static bool find_process(const char *name)
2711 {
2712 	size_t len = strlen(name);
2713 	DIR *dir;
2714 	struct dirent *d;
2715 	int ret = -1;
2716 
2717 	dir = opendir(procfs__mountpoint());
2718 	if (!dir)
2719 		return false;
2720 
2721 	/* Walk through the directory. */
2722 	while (ret && (d = readdir(dir)) != NULL) {
2723 		char path[PATH_MAX];
2724 		char *data;
2725 		size_t size;
2726 
2727 		if ((d->d_type != DT_DIR) ||
2728 		     !strcmp(".", d->d_name) ||
2729 		     !strcmp("..", d->d_name))
2730 			continue;
2731 
2732 		scnprintf(path, sizeof(path), "%s/%s/comm",
2733 			  procfs__mountpoint(), d->d_name);
2734 
2735 		if (filename__read_str(path, &data, &size))
2736 			continue;
2737 
2738 		ret = strncmp(name, data, len);
2739 		free(data);
2740 	}
2741 
2742 	closedir(dir);
2743 	return ret ? false : true;
2744 }
2745 
2746 int evsel__open_strerror(struct evsel *evsel, struct target *target,
2747 			 int err, char *msg, size_t size)
2748 {
2749 	char sbuf[STRERR_BUFSIZE];
2750 	int printed = 0, enforced = 0;
2751 
2752 	switch (err) {
2753 	case EPERM:
2754 	case EACCES:
2755 		printed += scnprintf(msg + printed, size - printed,
2756 			"Access to performance monitoring and observability operations is limited.\n");
2757 
2758 		if (!sysfs__read_int("fs/selinux/enforce", &enforced)) {
2759 			if (enforced) {
2760 				printed += scnprintf(msg + printed, size - printed,
2761 					"Enforced MAC policy settings (SELinux) can limit access to performance\n"
2762 					"monitoring and observability operations. Inspect system audit records for\n"
2763 					"more perf_event access control information and adjusting the policy.\n");
2764 			}
2765 		}
2766 
2767 		if (err == EPERM)
2768 			printed += scnprintf(msg, size,
2769 				"No permission to enable %s event.\n\n", evsel__name(evsel));
2770 
2771 		return scnprintf(msg + printed, size - printed,
2772 		 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
2773 		 "access to performance monitoring and observability operations for processes\n"
2774 		 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
2775 		 "More information can be found at 'Perf events and tool security' document:\n"
2776 		 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
2777 		 "perf_event_paranoid setting is %d:\n"
2778 		 "  -1: Allow use of (almost) all events by all users\n"
2779 		 "      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2780 		 ">= 0: Disallow raw and ftrace function tracepoint access\n"
2781 		 ">= 1: Disallow CPU event access\n"
2782 		 ">= 2: Disallow kernel profiling\n"
2783 		 "To make the adjusted perf_event_paranoid setting permanent preserve it\n"
2784 		 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)",
2785 		 perf_event_paranoid());
2786 	case ENOENT:
2787 		return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
2788 	case EMFILE:
2789 		return scnprintf(msg, size, "%s",
2790 			 "Too many events are opened.\n"
2791 			 "Probably the maximum number of open file descriptors has been reached.\n"
2792 			 "Hint: Try again after reducing the number of events.\n"
2793 			 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2794 	case ENOMEM:
2795 		if (evsel__has_callchain(evsel) &&
2796 		    access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2797 			return scnprintf(msg, size,
2798 					 "Not enough memory to setup event with callchain.\n"
2799 					 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2800 					 "Hint: Current value: %d", sysctl__max_stack());
2801 		break;
2802 	case ENODEV:
2803 		if (target->cpu_list)
2804 			return scnprintf(msg, size, "%s",
2805 	 "No such device - did you specify an out-of-range profile CPU?");
2806 		break;
2807 	case EOPNOTSUPP:
2808 		if (evsel->core.attr.aux_output)
2809 			return scnprintf(msg, size,
2810 	"%s: PMU Hardware doesn't support 'aux_output' feature",
2811 					 evsel__name(evsel));
2812 		if (evsel->core.attr.sample_period != 0)
2813 			return scnprintf(msg, size,
2814 	"%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2815 					 evsel__name(evsel));
2816 		if (evsel->core.attr.precise_ip)
2817 			return scnprintf(msg, size, "%s",
2818 	"\'precise\' request may not be supported. Try removing 'p' modifier.");
2819 #if defined(__i386__) || defined(__x86_64__)
2820 		if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
2821 			return scnprintf(msg, size, "%s",
2822 	"No hardware sampling interrupt available.\n");
2823 #endif
2824 		break;
2825 	case EBUSY:
2826 		if (find_process("oprofiled"))
2827 			return scnprintf(msg, size,
2828 	"The PMU counters are busy/taken by another profiler.\n"
2829 	"We found oprofile daemon running, please stop it and try again.");
2830 		break;
2831 	case EINVAL:
2832 		if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
2833 			return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
2834 		if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
2835 			return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
2836 		if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
2837 			return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2838 		if (perf_missing_features.clockid)
2839 			return scnprintf(msg, size, "clockid feature not supported.");
2840 		if (perf_missing_features.clockid_wrong)
2841 			return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2842 		if (perf_missing_features.aux_output)
2843 			return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
2844 		break;
2845 	case ENODATA:
2846 		return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
2847 				 "Please add an auxiliary event in front of the load latency event.");
2848 	default:
2849 		break;
2850 	}
2851 
2852 	return scnprintf(msg, size,
2853 	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2854 	"/bin/dmesg | grep -i perf may provide additional information.\n",
2855 			 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
2856 }
2857 
2858 struct perf_env *evsel__env(struct evsel *evsel)
2859 {
2860 	if (evsel && evsel->evlist)
2861 		return evsel->evlist->env;
2862 	return &perf_env;
2863 }
2864 
2865 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
2866 {
2867 	int cpu, thread;
2868 
2869 	for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
2870 		for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
2871 		     thread++) {
2872 			int fd = FD(evsel, cpu, thread);
2873 
2874 			if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
2875 						   cpu, thread, fd) < 0)
2876 				return -1;
2877 		}
2878 	}
2879 
2880 	return 0;
2881 }
2882 
2883 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
2884 {
2885 	struct perf_cpu_map *cpus = evsel->core.cpus;
2886 	struct perf_thread_map *threads = evsel->core.threads;
2887 
2888 	if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
2889 		return -ENOMEM;
2890 
2891 	return store_evsel_ids(evsel, evlist);
2892 }
2893 
2894 void evsel__zero_per_pkg(struct evsel *evsel)
2895 {
2896 	struct hashmap_entry *cur;
2897 	size_t bkt;
2898 
2899 	if (evsel->per_pkg_mask) {
2900 		hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt)
2901 			free((char *)cur->key);
2902 
2903 		hashmap__clear(evsel->per_pkg_mask);
2904 	}
2905 }
2906 
2907 bool evsel__is_hybrid(struct evsel *evsel)
2908 {
2909 	return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name);
2910 }
2911 
2912 struct evsel *evsel__leader(struct evsel *evsel)
2913 {
2914 	return container_of(evsel->core.leader, struct evsel, core);
2915 }
2916 
2917 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader)
2918 {
2919 	return evsel->core.leader == &leader->core;
2920 }
2921 
2922 bool evsel__is_leader(struct evsel *evsel)
2923 {
2924 	return evsel__has_leader(evsel, evsel);
2925 }
2926 
2927 void evsel__set_leader(struct evsel *evsel, struct evsel *leader)
2928 {
2929 	evsel->core.leader = &leader->core;
2930 }
2931