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
evsel__no_extra_init(struct evsel * evsel __maybe_unused)62 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
63 {
64 return 0;
65 }
66
test_attr__ready(void)67 void __weak test_attr__ready(void) { }
68
evsel__no_extra_fini(struct evsel * evsel __maybe_unused)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
evsel__object_config(size_t object_size,int (* init)(struct evsel * evsel),void (* fini)(struct evsel * evsel))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
__evsel__sample_size(u64 sample_type)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 */
__perf_evsel__calc_id_pos(u64 sample_type)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 */
__perf_evsel__calc_is_pos(u64 sample_type)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
evsel__calc_id_pos(struct evsel * evsel)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
__evsel__set_sample_bit(struct evsel * evsel,enum perf_event_sample_format bit)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
__evsel__reset_sample_bit(struct evsel * evsel,enum perf_event_sample_format bit)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
evsel__set_sample_id(struct evsel * evsel,bool can_sample_identifier)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 */
evsel__is_function_event(struct evsel * evsel)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
evsel__init(struct evsel * evsel,struct perf_event_attr * attr,int idx)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
evsel__new_idx(struct perf_event_attr * attr,int idx)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
perf_event_can_profile_kernel(void)292 static bool perf_event_can_profile_kernel(void)
293 {
294 return perf_event_paranoid_check(1);
295 }
296
evsel__new_cycles(bool precise,__u32 type,__u64 config)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
copy_config_terms(struct list_head * dst,struct list_head * src)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
evsel__copy_config_terms(struct evsel * dst,struct evsel * src)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 */
evsel__clone(struct evsel * orig)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 */
evsel__newtp_idx(const char * sys,const char * name,int idx)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
evsel__match_bpf_counter_events(const char * name)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
__evsel__hw_name(u64 config)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
evsel__add_modifiers(struct evsel * evsel,char * bf,size_t size)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
evsel__hw_name(struct evsel * evsel,char * bf,size_t size)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
__evsel__sw_name(u64 config)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
evsel__sw_name(struct evsel * evsel,char * bf,size_t size)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
__evsel__bp_name(char * bf,size_t size,u64 addr,u64 type)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
evsel__bp_name(struct evsel * evsel,char * bf,size_t size)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
evsel__is_cache_op_valid(u8 type,u8 op)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
__evsel__hw_cache_type_op_res_name(u8 type,u8 op,u8 result,char * bf,size_t size)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
__evsel__hw_cache_name(u64 config,char * bf,size_t size)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
evsel__hw_cache_name(struct evsel * evsel,char * bf,size_t size)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
evsel__raw_name(struct evsel * evsel,char * bf,size_t size)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
evsel__tool_name(char * bf,size_t size)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
evsel__name(struct evsel * evsel)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
evsel__group_name(struct evsel * evsel)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 */
evsel__group_desc(struct evsel * evsel,char * buf,size_t size)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
__evsel__config_callchain(struct evsel * evsel,struct record_opts * opts,struct callchain_param * param)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
evsel__config_callchain(struct evsel * evsel,struct record_opts * opts,struct callchain_param * param)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
evsel__reset_callgraph(struct evsel * evsel,struct callchain_param * param)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
evsel__apply_config_terms(struct evsel * evsel,struct record_opts * opts,bool track)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, ¶m)) {
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, ¶m);
1029 }
1030 }
1031 }
1032
__evsel__get_config_term(struct evsel * evsel,enum evsel_term_type type)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
arch_evsel__set_sample_weight(struct evsel * evsel)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 */
evsel__config(struct evsel * evsel,struct record_opts * opts,struct callchain_param * callchain)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
evsel__set_filter(struct evsel * evsel,const char * filter)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
evsel__append_filter(struct evsel * evsel,const char * fmt,const char * filter)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
evsel__append_tp_filter(struct evsel * evsel,const char * filter)1347 int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1348 {
1349 return evsel__append_filter(evsel, "(%s) && (%s)", filter);
1350 }
1351
evsel__append_addr_filter(struct evsel * evsel,const char * filter)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. */
evsel__enable_cpu(struct evsel * evsel,int cpu)1358 int evsel__enable_cpu(struct evsel *evsel, int cpu)
1359 {
1360 return perf_evsel__enable_cpu(&evsel->core, cpu);
1361 }
1362
evsel__enable(struct evsel * evsel)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. */
evsel__disable_cpu(struct evsel * evsel,int cpu)1373 int evsel__disable_cpu(struct evsel *evsel, int cpu)
1374 {
1375 return perf_evsel__disable_cpu(&evsel->core, cpu);
1376 }
1377
evsel__disable(struct evsel * evsel)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
free_config_terms(struct list_head * config_terms)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
evsel__free_config_terms(struct evsel * evsel)1405 static void evsel__free_config_terms(struct evsel *evsel)
1406 {
1407 free_config_terms(&evsel->config_terms);
1408 }
1409
evsel__exit(struct evsel * evsel)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
evsel__delete(struct evsel * evsel)1433 void evsel__delete(struct evsel *evsel)
1434 {
1435 evsel__exit(evsel);
1436 free(evsel);
1437 }
1438
evsel__compute_deltas(struct evsel * evsel,int cpu,int thread,struct perf_counts_values * count)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
perf_counts_values__scale(struct perf_counts_values * count,bool scale,s8 * pscaled)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
evsel__read_one(struct evsel * evsel,int cpu,int thread)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
evsel__set_count(struct evsel * counter,int cpu,int thread,u64 val,u64 ena,u64 run)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
evsel__process_group_data(struct evsel * leader,int cpu,int thread,u64 * data)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
evsel__read_group(struct evsel * leader,int cpu,int thread)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
evsel__read_counter(struct evsel * evsel,int cpu,int thread)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
__evsel__read_on_cpu(struct evsel * evsel,int cpu,int thread,bool scale)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
evsel__match_other_cpu(struct evsel * evsel,struct evsel * other,int cpu)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
evsel__hybrid_group_cpu(struct evsel * evsel,int cpu)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
get_group_fd(struct evsel * evsel,int cpu,int thread)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
evsel__remove_fd(struct evsel * pos,int nr_cpus,int nr_threads,int thread_idx)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
update_fds(struct evsel * evsel,int nr_cpus,int cpu_idx,int nr_threads,int thread_idx)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
evsel__ignore_missing_thread(struct evsel * evsel,int nr_cpus,int cpu,struct perf_thread_map * threads,int thread,int err)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
__open_attr__fprintf(FILE * fp,const char * name,const char * val,void * priv __maybe_unused)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
display_attr(struct perf_event_attr * attr)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
evsel__precise_ip_fallback(struct evsel * evsel)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
__evsel__prepare_open(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads)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
evsel__disable_missing_features(struct evsel * evsel)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
evsel__prepare_open(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads)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
evsel__detect_missing_features(struct evsel * evsel)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
evsel__increase_rlimit(enum rlimit_action * set_rlimit)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
evsel__open_cpu(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads,int start_cpu,int end_cpu)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
evsel__open(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads)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
evsel__close(struct evsel * evsel)2107 void evsel__close(struct evsel *evsel)
2108 {
2109 perf_evsel__close(&evsel->core);
2110 perf_evsel__free_id(&evsel->core);
2111 }
2112
evsel__open_per_cpu(struct evsel * evsel,struct perf_cpu_map * cpus,int cpu)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
evsel__open_per_thread(struct evsel * evsel,struct perf_thread_map * threads)2122 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
2123 {
2124 return evsel__open(evsel, NULL, threads);
2125 }
2126
perf_evsel__parse_id_sample(const struct evsel * evsel,const union perf_event * event,struct perf_sample * sample)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
overflow(const void * endp,u16 max_size,const void * offset,u64 size)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
perf_event__check_size(union perf_event * event,unsigned int sample_size)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
arch_perf_parse_sample_weight(struct perf_sample * data,const __u64 * array,u64 type __maybe_unused)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
evsel__parse_sample(struct evsel * evsel,union perf_event * event,struct perf_sample * data)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
evsel__parse_sample_timestamp(struct evsel * evsel,union perf_event * event,u64 * timestamp)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
evsel__field(struct evsel * evsel,const char * name)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
evsel__rawptr(struct evsel * evsel,struct perf_sample * sample,const char * name)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
format_field__intval(struct tep_format_field * field,struct perf_sample * sample,bool needs_swap)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
evsel__intval(struct evsel * evsel,struct perf_sample * sample,const char * name)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
evsel__fallback(struct evsel * evsel,int err,char * msg,size_t msgsize)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
find_process(const char * name)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
evsel__open_strerror(struct evsel * evsel,struct target * target,int err,char * msg,size_t size)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
evsel__env(struct evsel * evsel)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
store_evsel_ids(struct evsel * evsel,struct evlist * evlist)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
evsel__store_ids(struct evsel * evsel,struct evlist * evlist)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
evsel__zero_per_pkg(struct evsel * evsel)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
evsel__is_hybrid(struct evsel * evsel)2907 bool evsel__is_hybrid(struct evsel *evsel)
2908 {
2909 return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name);
2910 }
2911
evsel__leader(struct evsel * evsel)2912 struct evsel *evsel__leader(struct evsel *evsel)
2913 {
2914 return container_of(evsel->core.leader, struct evsel, core);
2915 }
2916
evsel__has_leader(struct evsel * evsel,struct evsel * leader)2917 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader)
2918 {
2919 return evsel->core.leader == &leader->core;
2920 }
2921
evsel__is_leader(struct evsel * evsel)2922 bool evsel__is_leader(struct evsel *evsel)
2923 {
2924 return evsel__has_leader(evsel, evsel);
2925 }
2926
evsel__set_leader(struct evsel * evsel,struct evsel * leader)2927 void evsel__set_leader(struct evsel *evsel, struct evsel *leader)
2928 {
2929 evsel->core.leader = &leader->core;
2930 }
2931