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 #include <api/fs/fs.h>
9 #include <errno.h>
10 #include <inttypes.h>
11 #include <poll.h>
12 #include "cpumap.h"
13 #include "util/mmap.h"
14 #include "thread_map.h"
15 #include "target.h"
16 #include "evlist.h"
17 #include "evsel.h"
18 #include "record.h"
19 #include "debug.h"
20 #include "units.h"
21 #include "bpf_counter.h"
22 #include <internal/lib.h> // page_size
23 #include "affinity.h"
24 #include "../perf.h"
25 #include "asm/bug.h"
26 #include "bpf-event.h"
27 #include "util/event.h"
28 #include "util/string2.h"
29 #include "util/perf_api_probe.h"
30 #include "util/evsel_fprintf.h"
31 #include "util/pmu.h"
32 #include "util/sample.h"
33 #include "util/bpf-filter.h"
34 #include "util/stat.h"
35 #include "util/util.h"
36 #include <signal.h>
37 #include <unistd.h>
38 #include <sched.h>
39 #include <stdlib.h>
40
41 #include "parse-events.h"
42 #include <subcmd/parse-options.h>
43
44 #include <fcntl.h>
45 #include <sys/ioctl.h>
46 #include <sys/mman.h>
47 #include <sys/prctl.h>
48 #include <sys/timerfd.h>
49
50 #include <linux/bitops.h>
51 #include <linux/hash.h>
52 #include <linux/log2.h>
53 #include <linux/err.h>
54 #include <linux/string.h>
55 #include <linux/time64.h>
56 #include <linux/zalloc.h>
57 #include <perf/evlist.h>
58 #include <perf/evsel.h>
59 #include <perf/cpumap.h>
60 #include <perf/mmap.h>
61
62 #include <internal/xyarray.h>
63
64 #ifdef LACKS_SIGQUEUE_PROTOTYPE
65 int sigqueue(pid_t pid, int sig, const union sigval value);
66 #endif
67
68 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
69 #define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
70
evlist__init(struct evlist * evlist,struct perf_cpu_map * cpus,struct perf_thread_map * threads)71 void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
72 struct perf_thread_map *threads)
73 {
74 perf_evlist__init(&evlist->core);
75 perf_evlist__set_maps(&evlist->core, cpus, threads);
76 evlist->workload.pid = -1;
77 evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
78 evlist->ctl_fd.fd = -1;
79 evlist->ctl_fd.ack = -1;
80 evlist->ctl_fd.pos = -1;
81 }
82
evlist__new(void)83 struct evlist *evlist__new(void)
84 {
85 struct evlist *evlist = zalloc(sizeof(*evlist));
86
87 if (evlist != NULL)
88 evlist__init(evlist, NULL, NULL);
89
90 return evlist;
91 }
92
evlist__new_default(void)93 struct evlist *evlist__new_default(void)
94 {
95 struct evlist *evlist = evlist__new();
96 bool can_profile_kernel;
97 int err;
98
99 if (!evlist)
100 return NULL;
101
102 can_profile_kernel = perf_event_paranoid_check(1);
103 err = parse_event(evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
104 if (err) {
105 evlist__delete(evlist);
106 return NULL;
107 }
108
109 if (evlist->core.nr_entries > 1) {
110 struct evsel *evsel;
111
112 evlist__for_each_entry(evlist, evsel)
113 evsel__set_sample_id(evsel, /*can_sample_identifier=*/false);
114 }
115
116 return evlist;
117 }
118
evlist__new_dummy(void)119 struct evlist *evlist__new_dummy(void)
120 {
121 struct evlist *evlist = evlist__new();
122
123 if (evlist && evlist__add_dummy(evlist)) {
124 evlist__delete(evlist);
125 evlist = NULL;
126 }
127
128 return evlist;
129 }
130
131 /**
132 * evlist__set_id_pos - set the positions of event ids.
133 * @evlist: selected event list
134 *
135 * Events with compatible sample types all have the same id_pos
136 * and is_pos. For convenience, put a copy on evlist.
137 */
evlist__set_id_pos(struct evlist * evlist)138 void evlist__set_id_pos(struct evlist *evlist)
139 {
140 struct evsel *first = evlist__first(evlist);
141
142 evlist->id_pos = first->id_pos;
143 evlist->is_pos = first->is_pos;
144 }
145
evlist__update_id_pos(struct evlist * evlist)146 static void evlist__update_id_pos(struct evlist *evlist)
147 {
148 struct evsel *evsel;
149
150 evlist__for_each_entry(evlist, evsel)
151 evsel__calc_id_pos(evsel);
152
153 evlist__set_id_pos(evlist);
154 }
155
evlist__purge(struct evlist * evlist)156 static void evlist__purge(struct evlist *evlist)
157 {
158 struct evsel *pos, *n;
159
160 evlist__for_each_entry_safe(evlist, n, pos) {
161 list_del_init(&pos->core.node);
162 pos->evlist = NULL;
163 evsel__delete(pos);
164 }
165
166 evlist->core.nr_entries = 0;
167 }
168
evlist__exit(struct evlist * evlist)169 void evlist__exit(struct evlist *evlist)
170 {
171 event_enable_timer__exit(&evlist->eet);
172 zfree(&evlist->mmap);
173 zfree(&evlist->overwrite_mmap);
174 perf_evlist__exit(&evlist->core);
175 }
176
evlist__delete(struct evlist * evlist)177 void evlist__delete(struct evlist *evlist)
178 {
179 if (evlist == NULL)
180 return;
181
182 evlist__free_stats(evlist);
183 evlist__munmap(evlist);
184 evlist__close(evlist);
185 evlist__purge(evlist);
186 evlist__exit(evlist);
187 free(evlist);
188 }
189
evlist__add(struct evlist * evlist,struct evsel * entry)190 void evlist__add(struct evlist *evlist, struct evsel *entry)
191 {
192 perf_evlist__add(&evlist->core, &entry->core);
193 entry->evlist = evlist;
194 entry->tracking = !entry->core.idx;
195
196 if (evlist->core.nr_entries == 1)
197 evlist__set_id_pos(evlist);
198 }
199
evlist__remove(struct evlist * evlist,struct evsel * evsel)200 void evlist__remove(struct evlist *evlist, struct evsel *evsel)
201 {
202 evsel->evlist = NULL;
203 perf_evlist__remove(&evlist->core, &evsel->core);
204 }
205
evlist__splice_list_tail(struct evlist * evlist,struct list_head * list)206 void evlist__splice_list_tail(struct evlist *evlist, struct list_head *list)
207 {
208 while (!list_empty(list)) {
209 struct evsel *evsel, *temp, *leader = NULL;
210
211 __evlist__for_each_entry_safe(list, temp, evsel) {
212 list_del_init(&evsel->core.node);
213 evlist__add(evlist, evsel);
214 leader = evsel;
215 break;
216 }
217
218 __evlist__for_each_entry_safe(list, temp, evsel) {
219 if (evsel__has_leader(evsel, leader)) {
220 list_del_init(&evsel->core.node);
221 evlist__add(evlist, evsel);
222 }
223 }
224 }
225 }
226
__evlist__set_tracepoints_handlers(struct evlist * evlist,const struct evsel_str_handler * assocs,size_t nr_assocs)227 int __evlist__set_tracepoints_handlers(struct evlist *evlist,
228 const struct evsel_str_handler *assocs, size_t nr_assocs)
229 {
230 size_t i;
231 int err;
232
233 for (i = 0; i < nr_assocs; i++) {
234 // Adding a handler for an event not in this evlist, just ignore it.
235 struct evsel *evsel = evlist__find_tracepoint_by_name(evlist, assocs[i].name);
236 if (evsel == NULL)
237 continue;
238
239 err = -EEXIST;
240 if (evsel->handler != NULL)
241 goto out;
242 evsel->handler = assocs[i].handler;
243 }
244
245 err = 0;
246 out:
247 return err;
248 }
249
evlist__set_leader(struct evlist * evlist)250 static void evlist__set_leader(struct evlist *evlist)
251 {
252 perf_evlist__set_leader(&evlist->core);
253 }
254
evlist__dummy_event(struct evlist * evlist)255 static struct evsel *evlist__dummy_event(struct evlist *evlist)
256 {
257 struct perf_event_attr attr = {
258 .type = PERF_TYPE_SOFTWARE,
259 .config = PERF_COUNT_SW_DUMMY,
260 .size = sizeof(attr), /* to capture ABI version */
261 /* Avoid frequency mode for dummy events to avoid associated timers. */
262 .freq = 0,
263 .sample_period = 1,
264 };
265
266 return evsel__new_idx(&attr, evlist->core.nr_entries);
267 }
268
evlist__add_dummy(struct evlist * evlist)269 int evlist__add_dummy(struct evlist *evlist)
270 {
271 struct evsel *evsel = evlist__dummy_event(evlist);
272
273 if (evsel == NULL)
274 return -ENOMEM;
275
276 evlist__add(evlist, evsel);
277 return 0;
278 }
279
evlist__add_aux_dummy(struct evlist * evlist,bool system_wide)280 struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide)
281 {
282 struct evsel *evsel = evlist__dummy_event(evlist);
283
284 if (!evsel)
285 return NULL;
286
287 evsel->core.attr.exclude_kernel = 1;
288 evsel->core.attr.exclude_guest = 1;
289 evsel->core.attr.exclude_hv = 1;
290 evsel->core.system_wide = system_wide;
291 evsel->no_aux_samples = true;
292 evsel->name = strdup("dummy:u");
293
294 evlist__add(evlist, evsel);
295 return evsel;
296 }
297
298 #ifdef HAVE_LIBTRACEEVENT
evlist__add_sched_switch(struct evlist * evlist,bool system_wide)299 struct evsel *evlist__add_sched_switch(struct evlist *evlist, bool system_wide)
300 {
301 struct evsel *evsel = evsel__newtp_idx("sched", "sched_switch", 0);
302
303 if (IS_ERR(evsel))
304 return evsel;
305
306 evsel__set_sample_bit(evsel, CPU);
307 evsel__set_sample_bit(evsel, TIME);
308
309 evsel->core.system_wide = system_wide;
310 evsel->no_aux_samples = true;
311
312 evlist__add(evlist, evsel);
313 return evsel;
314 }
315 #endif
316
evlist__add_attrs(struct evlist * evlist,struct perf_event_attr * attrs,size_t nr_attrs)317 int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
318 {
319 struct evsel *evsel, *n;
320 LIST_HEAD(head);
321 size_t i;
322
323 for (i = 0; i < nr_attrs; i++) {
324 evsel = evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
325 if (evsel == NULL)
326 goto out_delete_partial_list;
327 list_add_tail(&evsel->core.node, &head);
328 }
329
330 evlist__splice_list_tail(evlist, &head);
331
332 return 0;
333
334 out_delete_partial_list:
335 __evlist__for_each_entry_safe(&head, n, evsel)
336 evsel__delete(evsel);
337 return -1;
338 }
339
__evlist__add_default_attrs(struct evlist * evlist,struct perf_event_attr * attrs,size_t nr_attrs)340 int __evlist__add_default_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
341 {
342 size_t i;
343
344 for (i = 0; i < nr_attrs; i++)
345 event_attr_init(attrs + i);
346
347 return evlist__add_attrs(evlist, attrs, nr_attrs);
348 }
349
arch_evlist__add_default_attrs(struct evlist * evlist,struct perf_event_attr * attrs,size_t nr_attrs)350 __weak int arch_evlist__add_default_attrs(struct evlist *evlist,
351 struct perf_event_attr *attrs,
352 size_t nr_attrs)
353 {
354 if (!nr_attrs)
355 return 0;
356
357 return __evlist__add_default_attrs(evlist, attrs, nr_attrs);
358 }
359
evlist__find_tracepoint_by_id(struct evlist * evlist,int id)360 struct evsel *evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
361 {
362 struct evsel *evsel;
363
364 evlist__for_each_entry(evlist, evsel) {
365 if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
366 (int)evsel->core.attr.config == id)
367 return evsel;
368 }
369
370 return NULL;
371 }
372
evlist__find_tracepoint_by_name(struct evlist * evlist,const char * name)373 struct evsel *evlist__find_tracepoint_by_name(struct evlist *evlist, const char *name)
374 {
375 struct evsel *evsel;
376
377 evlist__for_each_entry(evlist, evsel) {
378 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
379 (strcmp(evsel->name, name) == 0))
380 return evsel;
381 }
382
383 return NULL;
384 }
385
386 #ifdef HAVE_LIBTRACEEVENT
evlist__add_newtp(struct evlist * evlist,const char * sys,const char * name,void * handler)387 int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler)
388 {
389 struct evsel *evsel = evsel__newtp(sys, name);
390
391 if (IS_ERR(evsel))
392 return -1;
393
394 evsel->handler = handler;
395 evlist__add(evlist, evsel);
396 return 0;
397 }
398 #endif
399
evlist__cpu_begin(struct evlist * evlist,struct affinity * affinity)400 struct evlist_cpu_iterator evlist__cpu_begin(struct evlist *evlist, struct affinity *affinity)
401 {
402 struct evlist_cpu_iterator itr = {
403 .container = evlist,
404 .evsel = NULL,
405 .cpu_map_idx = 0,
406 .evlist_cpu_map_idx = 0,
407 .evlist_cpu_map_nr = perf_cpu_map__nr(evlist->core.all_cpus),
408 .cpu = (struct perf_cpu){ .cpu = -1},
409 .affinity = affinity,
410 };
411
412 if (evlist__empty(evlist)) {
413 /* Ensure the empty list doesn't iterate. */
414 itr.evlist_cpu_map_idx = itr.evlist_cpu_map_nr;
415 } else {
416 itr.evsel = evlist__first(evlist);
417 if (itr.affinity) {
418 itr.cpu = perf_cpu_map__cpu(evlist->core.all_cpus, 0);
419 affinity__set(itr.affinity, itr.cpu.cpu);
420 itr.cpu_map_idx = perf_cpu_map__idx(itr.evsel->core.cpus, itr.cpu);
421 /*
422 * If this CPU isn't in the evsel's cpu map then advance
423 * through the list.
424 */
425 if (itr.cpu_map_idx == -1)
426 evlist_cpu_iterator__next(&itr);
427 }
428 }
429 return itr;
430 }
431
evlist_cpu_iterator__next(struct evlist_cpu_iterator * evlist_cpu_itr)432 void evlist_cpu_iterator__next(struct evlist_cpu_iterator *evlist_cpu_itr)
433 {
434 while (evlist_cpu_itr->evsel != evlist__last(evlist_cpu_itr->container)) {
435 evlist_cpu_itr->evsel = evsel__next(evlist_cpu_itr->evsel);
436 evlist_cpu_itr->cpu_map_idx =
437 perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
438 evlist_cpu_itr->cpu);
439 if (evlist_cpu_itr->cpu_map_idx != -1)
440 return;
441 }
442 evlist_cpu_itr->evlist_cpu_map_idx++;
443 if (evlist_cpu_itr->evlist_cpu_map_idx < evlist_cpu_itr->evlist_cpu_map_nr) {
444 evlist_cpu_itr->evsel = evlist__first(evlist_cpu_itr->container);
445 evlist_cpu_itr->cpu =
446 perf_cpu_map__cpu(evlist_cpu_itr->container->core.all_cpus,
447 evlist_cpu_itr->evlist_cpu_map_idx);
448 if (evlist_cpu_itr->affinity)
449 affinity__set(evlist_cpu_itr->affinity, evlist_cpu_itr->cpu.cpu);
450 evlist_cpu_itr->cpu_map_idx =
451 perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
452 evlist_cpu_itr->cpu);
453 /*
454 * If this CPU isn't in the evsel's cpu map then advance through
455 * the list.
456 */
457 if (evlist_cpu_itr->cpu_map_idx == -1)
458 evlist_cpu_iterator__next(evlist_cpu_itr);
459 }
460 }
461
evlist_cpu_iterator__end(const struct evlist_cpu_iterator * evlist_cpu_itr)462 bool evlist_cpu_iterator__end(const struct evlist_cpu_iterator *evlist_cpu_itr)
463 {
464 return evlist_cpu_itr->evlist_cpu_map_idx >= evlist_cpu_itr->evlist_cpu_map_nr;
465 }
466
evsel__strcmp(struct evsel * pos,char * evsel_name)467 static int evsel__strcmp(struct evsel *pos, char *evsel_name)
468 {
469 if (!evsel_name)
470 return 0;
471 if (evsel__is_dummy_event(pos))
472 return 1;
473 return !evsel__name_is(pos, evsel_name);
474 }
475
evlist__is_enabled(struct evlist * evlist)476 static int evlist__is_enabled(struct evlist *evlist)
477 {
478 struct evsel *pos;
479
480 evlist__for_each_entry(evlist, pos) {
481 if (!evsel__is_group_leader(pos) || !pos->core.fd)
482 continue;
483 /* If at least one event is enabled, evlist is enabled. */
484 if (!pos->disabled)
485 return true;
486 }
487 return false;
488 }
489
__evlist__disable(struct evlist * evlist,char * evsel_name,bool excl_dummy)490 static void __evlist__disable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
491 {
492 struct evsel *pos;
493 struct evlist_cpu_iterator evlist_cpu_itr;
494 struct affinity saved_affinity, *affinity = NULL;
495 bool has_imm = false;
496
497 // See explanation in evlist__close()
498 if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
499 if (affinity__setup(&saved_affinity) < 0)
500 return;
501 affinity = &saved_affinity;
502 }
503
504 /* Disable 'immediate' events last */
505 for (int imm = 0; imm <= 1; imm++) {
506 evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
507 pos = evlist_cpu_itr.evsel;
508 if (evsel__strcmp(pos, evsel_name))
509 continue;
510 if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
511 continue;
512 if (excl_dummy && evsel__is_dummy_event(pos))
513 continue;
514 if (pos->immediate)
515 has_imm = true;
516 if (pos->immediate != imm)
517 continue;
518 evsel__disable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
519 }
520 if (!has_imm)
521 break;
522 }
523
524 affinity__cleanup(affinity);
525 evlist__for_each_entry(evlist, pos) {
526 if (evsel__strcmp(pos, evsel_name))
527 continue;
528 if (!evsel__is_group_leader(pos) || !pos->core.fd)
529 continue;
530 if (excl_dummy && evsel__is_dummy_event(pos))
531 continue;
532 pos->disabled = true;
533 }
534
535 /*
536 * If we disabled only single event, we need to check
537 * the enabled state of the evlist manually.
538 */
539 if (evsel_name)
540 evlist->enabled = evlist__is_enabled(evlist);
541 else
542 evlist->enabled = false;
543 }
544
evlist__disable(struct evlist * evlist)545 void evlist__disable(struct evlist *evlist)
546 {
547 __evlist__disable(evlist, NULL, false);
548 }
549
evlist__disable_non_dummy(struct evlist * evlist)550 void evlist__disable_non_dummy(struct evlist *evlist)
551 {
552 __evlist__disable(evlist, NULL, true);
553 }
554
evlist__disable_evsel(struct evlist * evlist,char * evsel_name)555 void evlist__disable_evsel(struct evlist *evlist, char *evsel_name)
556 {
557 __evlist__disable(evlist, evsel_name, false);
558 }
559
__evlist__enable(struct evlist * evlist,char * evsel_name,bool excl_dummy)560 static void __evlist__enable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
561 {
562 struct evsel *pos;
563 struct evlist_cpu_iterator evlist_cpu_itr;
564 struct affinity saved_affinity, *affinity = NULL;
565
566 // See explanation in evlist__close()
567 if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
568 if (affinity__setup(&saved_affinity) < 0)
569 return;
570 affinity = &saved_affinity;
571 }
572
573 evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
574 pos = evlist_cpu_itr.evsel;
575 if (evsel__strcmp(pos, evsel_name))
576 continue;
577 if (!evsel__is_group_leader(pos) || !pos->core.fd)
578 continue;
579 if (excl_dummy && evsel__is_dummy_event(pos))
580 continue;
581 evsel__enable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
582 }
583 affinity__cleanup(affinity);
584 evlist__for_each_entry(evlist, pos) {
585 if (evsel__strcmp(pos, evsel_name))
586 continue;
587 if (!evsel__is_group_leader(pos) || !pos->core.fd)
588 continue;
589 if (excl_dummy && evsel__is_dummy_event(pos))
590 continue;
591 pos->disabled = false;
592 }
593
594 /*
595 * Even single event sets the 'enabled' for evlist,
596 * so the toggle can work properly and toggle to
597 * 'disabled' state.
598 */
599 evlist->enabled = true;
600 }
601
evlist__enable(struct evlist * evlist)602 void evlist__enable(struct evlist *evlist)
603 {
604 __evlist__enable(evlist, NULL, false);
605 }
606
evlist__enable_non_dummy(struct evlist * evlist)607 void evlist__enable_non_dummy(struct evlist *evlist)
608 {
609 __evlist__enable(evlist, NULL, true);
610 }
611
evlist__enable_evsel(struct evlist * evlist,char * evsel_name)612 void evlist__enable_evsel(struct evlist *evlist, char *evsel_name)
613 {
614 __evlist__enable(evlist, evsel_name, false);
615 }
616
evlist__toggle_enable(struct evlist * evlist)617 void evlist__toggle_enable(struct evlist *evlist)
618 {
619 (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
620 }
621
evlist__add_pollfd(struct evlist * evlist,int fd)622 int evlist__add_pollfd(struct evlist *evlist, int fd)
623 {
624 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default);
625 }
626
evlist__filter_pollfd(struct evlist * evlist,short revents_and_mask)627 int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
628 {
629 return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask);
630 }
631
632 #ifdef HAVE_EVENTFD_SUPPORT
evlist__add_wakeup_eventfd(struct evlist * evlist,int fd)633 int evlist__add_wakeup_eventfd(struct evlist *evlist, int fd)
634 {
635 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
636 fdarray_flag__nonfilterable |
637 fdarray_flag__non_perf_event);
638 }
639 #endif
640
evlist__poll(struct evlist * evlist,int timeout)641 int evlist__poll(struct evlist *evlist, int timeout)
642 {
643 return perf_evlist__poll(&evlist->core, timeout);
644 }
645
evlist__id2sid(struct evlist * evlist,u64 id)646 struct perf_sample_id *evlist__id2sid(struct evlist *evlist, u64 id)
647 {
648 struct hlist_head *head;
649 struct perf_sample_id *sid;
650 int hash;
651
652 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
653 head = &evlist->core.heads[hash];
654
655 hlist_for_each_entry(sid, head, node)
656 if (sid->id == id)
657 return sid;
658
659 return NULL;
660 }
661
evlist__id2evsel(struct evlist * evlist,u64 id)662 struct evsel *evlist__id2evsel(struct evlist *evlist, u64 id)
663 {
664 struct perf_sample_id *sid;
665
666 if (evlist->core.nr_entries == 1 || !id)
667 return evlist__first(evlist);
668
669 sid = evlist__id2sid(evlist, id);
670 if (sid)
671 return container_of(sid->evsel, struct evsel, core);
672
673 if (!evlist__sample_id_all(evlist))
674 return evlist__first(evlist);
675
676 return NULL;
677 }
678
evlist__id2evsel_strict(struct evlist * evlist,u64 id)679 struct evsel *evlist__id2evsel_strict(struct evlist *evlist, u64 id)
680 {
681 struct perf_sample_id *sid;
682
683 if (!id)
684 return NULL;
685
686 sid = evlist__id2sid(evlist, id);
687 if (sid)
688 return container_of(sid->evsel, struct evsel, core);
689
690 return NULL;
691 }
692
evlist__event2id(struct evlist * evlist,union perf_event * event,u64 * id)693 static int evlist__event2id(struct evlist *evlist, union perf_event *event, u64 *id)
694 {
695 const __u64 *array = event->sample.array;
696 ssize_t n;
697
698 n = (event->header.size - sizeof(event->header)) >> 3;
699
700 if (event->header.type == PERF_RECORD_SAMPLE) {
701 if (evlist->id_pos >= n)
702 return -1;
703 *id = array[evlist->id_pos];
704 } else {
705 if (evlist->is_pos > n)
706 return -1;
707 n -= evlist->is_pos;
708 *id = array[n];
709 }
710 return 0;
711 }
712
evlist__event2evsel(struct evlist * evlist,union perf_event * event)713 struct evsel *evlist__event2evsel(struct evlist *evlist, union perf_event *event)
714 {
715 struct evsel *first = evlist__first(evlist);
716 struct hlist_head *head;
717 struct perf_sample_id *sid;
718 int hash;
719 u64 id;
720
721 if (evlist->core.nr_entries == 1)
722 return first;
723
724 if (!first->core.attr.sample_id_all &&
725 event->header.type != PERF_RECORD_SAMPLE)
726 return first;
727
728 if (evlist__event2id(evlist, event, &id))
729 return NULL;
730
731 /* Synthesized events have an id of zero */
732 if (!id)
733 return first;
734
735 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
736 head = &evlist->core.heads[hash];
737
738 hlist_for_each_entry(sid, head, node) {
739 if (sid->id == id)
740 return container_of(sid->evsel, struct evsel, core);
741 }
742 return NULL;
743 }
744
evlist__set_paused(struct evlist * evlist,bool value)745 static int evlist__set_paused(struct evlist *evlist, bool value)
746 {
747 int i;
748
749 if (!evlist->overwrite_mmap)
750 return 0;
751
752 for (i = 0; i < evlist->core.nr_mmaps; i++) {
753 int fd = evlist->overwrite_mmap[i].core.fd;
754 int err;
755
756 if (fd < 0)
757 continue;
758 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
759 if (err)
760 return err;
761 }
762 return 0;
763 }
764
evlist__pause(struct evlist * evlist)765 static int evlist__pause(struct evlist *evlist)
766 {
767 return evlist__set_paused(evlist, true);
768 }
769
evlist__resume(struct evlist * evlist)770 static int evlist__resume(struct evlist *evlist)
771 {
772 return evlist__set_paused(evlist, false);
773 }
774
evlist__munmap_nofree(struct evlist * evlist)775 static void evlist__munmap_nofree(struct evlist *evlist)
776 {
777 int i;
778
779 if (evlist->mmap)
780 for (i = 0; i < evlist->core.nr_mmaps; i++)
781 perf_mmap__munmap(&evlist->mmap[i].core);
782
783 if (evlist->overwrite_mmap)
784 for (i = 0; i < evlist->core.nr_mmaps; i++)
785 perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
786 }
787
evlist__munmap(struct evlist * evlist)788 void evlist__munmap(struct evlist *evlist)
789 {
790 evlist__munmap_nofree(evlist);
791 zfree(&evlist->mmap);
792 zfree(&evlist->overwrite_mmap);
793 }
794
perf_mmap__unmap_cb(struct perf_mmap * map)795 static void perf_mmap__unmap_cb(struct perf_mmap *map)
796 {
797 struct mmap *m = container_of(map, struct mmap, core);
798
799 mmap__munmap(m);
800 }
801
evlist__alloc_mmap(struct evlist * evlist,bool overwrite)802 static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
803 bool overwrite)
804 {
805 int i;
806 struct mmap *map;
807
808 map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
809 if (!map)
810 return NULL;
811
812 for (i = 0; i < evlist->core.nr_mmaps; i++) {
813 struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
814
815 /*
816 * When the perf_mmap() call is made we grab one refcount, plus
817 * one extra to let perf_mmap__consume() get the last
818 * events after all real references (perf_mmap__get()) are
819 * dropped.
820 *
821 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
822 * thus does perf_mmap__get() on it.
823 */
824 perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
825 }
826
827 return map;
828 }
829
830 static void
perf_evlist__mmap_cb_idx(struct perf_evlist * _evlist,struct perf_evsel * _evsel,struct perf_mmap_param * _mp,int idx)831 perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
832 struct perf_evsel *_evsel,
833 struct perf_mmap_param *_mp,
834 int idx)
835 {
836 struct evlist *evlist = container_of(_evlist, struct evlist, core);
837 struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
838 struct evsel *evsel = container_of(_evsel, struct evsel, core);
839
840 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, evsel, idx);
841 }
842
843 static struct perf_mmap*
perf_evlist__mmap_cb_get(struct perf_evlist * _evlist,bool overwrite,int idx)844 perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx)
845 {
846 struct evlist *evlist = container_of(_evlist, struct evlist, core);
847 struct mmap *maps;
848
849 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
850
851 if (!maps) {
852 maps = evlist__alloc_mmap(evlist, overwrite);
853 if (!maps)
854 return NULL;
855
856 if (overwrite) {
857 evlist->overwrite_mmap = maps;
858 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
859 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
860 } else {
861 evlist->mmap = maps;
862 }
863 }
864
865 return &maps[idx].core;
866 }
867
868 static int
perf_evlist__mmap_cb_mmap(struct perf_mmap * _map,struct perf_mmap_param * _mp,int output,struct perf_cpu cpu)869 perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
870 int output, struct perf_cpu cpu)
871 {
872 struct mmap *map = container_of(_map, struct mmap, core);
873 struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
874
875 return mmap__mmap(map, mp, output, cpu);
876 }
877
perf_event_mlock_kb_in_pages(void)878 unsigned long perf_event_mlock_kb_in_pages(void)
879 {
880 unsigned long pages;
881 int max;
882
883 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
884 /*
885 * Pick a once upon a time good value, i.e. things look
886 * strange since we can't read a sysctl value, but lets not
887 * die yet...
888 */
889 max = 512;
890 } else {
891 max -= (page_size / 1024);
892 }
893
894 pages = (max * 1024) / page_size;
895 if (!is_power_of_2(pages))
896 pages = rounddown_pow_of_two(pages);
897
898 return pages;
899 }
900
evlist__mmap_size(unsigned long pages)901 size_t evlist__mmap_size(unsigned long pages)
902 {
903 if (pages == UINT_MAX)
904 pages = perf_event_mlock_kb_in_pages();
905 else if (!is_power_of_2(pages))
906 return 0;
907
908 return (pages + 1) * page_size;
909 }
910
parse_pages_arg(const char * str,unsigned long min,unsigned long max)911 static long parse_pages_arg(const char *str, unsigned long min,
912 unsigned long max)
913 {
914 unsigned long pages, val;
915 static struct parse_tag tags[] = {
916 { .tag = 'B', .mult = 1 },
917 { .tag = 'K', .mult = 1 << 10 },
918 { .tag = 'M', .mult = 1 << 20 },
919 { .tag = 'G', .mult = 1 << 30 },
920 { .tag = 0 },
921 };
922
923 if (str == NULL)
924 return -EINVAL;
925
926 val = parse_tag_value(str, tags);
927 if (val != (unsigned long) -1) {
928 /* we got file size value */
929 pages = PERF_ALIGN(val, page_size) / page_size;
930 } else {
931 /* we got pages count value */
932 char *eptr;
933 pages = strtoul(str, &eptr, 10);
934 if (*eptr != '\0')
935 return -EINVAL;
936 }
937
938 if (pages == 0 && min == 0) {
939 /* leave number of pages at 0 */
940 } else if (!is_power_of_2(pages)) {
941 char buf[100];
942
943 /* round pages up to next power of 2 */
944 pages = roundup_pow_of_two(pages);
945 if (!pages)
946 return -EINVAL;
947
948 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
949 pr_info("rounding mmap pages size to %s (%lu pages)\n",
950 buf, pages);
951 }
952
953 if (pages > max)
954 return -EINVAL;
955
956 return pages;
957 }
958
__evlist__parse_mmap_pages(unsigned int * mmap_pages,const char * str)959 int __evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
960 {
961 unsigned long max = UINT_MAX;
962 long pages;
963
964 if (max > SIZE_MAX / page_size)
965 max = SIZE_MAX / page_size;
966
967 pages = parse_pages_arg(str, 1, max);
968 if (pages < 0) {
969 pr_err("Invalid argument for --mmap_pages/-m\n");
970 return -1;
971 }
972
973 *mmap_pages = pages;
974 return 0;
975 }
976
evlist__parse_mmap_pages(const struct option * opt,const char * str,int unset __maybe_unused)977 int evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset __maybe_unused)
978 {
979 return __evlist__parse_mmap_pages(opt->value, str);
980 }
981
982 /**
983 * evlist__mmap_ex - Create mmaps to receive events.
984 * @evlist: list of events
985 * @pages: map length in pages
986 * @overwrite: overwrite older events?
987 * @auxtrace_pages - auxtrace map length in pages
988 * @auxtrace_overwrite - overwrite older auxtrace data?
989 *
990 * If @overwrite is %false the user needs to signal event consumption using
991 * perf_mmap__write_tail(). Using evlist__mmap_read() does this
992 * automatically.
993 *
994 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
995 * consumption using auxtrace_mmap__write_tail().
996 *
997 * Return: %0 on success, negative error code otherwise.
998 */
evlist__mmap_ex(struct evlist * evlist,unsigned int pages,unsigned int auxtrace_pages,bool auxtrace_overwrite,int nr_cblocks,int affinity,int flush,int comp_level)999 int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
1000 unsigned int auxtrace_pages,
1001 bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
1002 int comp_level)
1003 {
1004 /*
1005 * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1006 * Its value is decided by evsel's write_backward.
1007 * So &mp should not be passed through const pointer.
1008 */
1009 struct mmap_params mp = {
1010 .nr_cblocks = nr_cblocks,
1011 .affinity = affinity,
1012 .flush = flush,
1013 .comp_level = comp_level
1014 };
1015 struct perf_evlist_mmap_ops ops = {
1016 .idx = perf_evlist__mmap_cb_idx,
1017 .get = perf_evlist__mmap_cb_get,
1018 .mmap = perf_evlist__mmap_cb_mmap,
1019 };
1020
1021 evlist->core.mmap_len = evlist__mmap_size(pages);
1022 pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
1023
1024 auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
1025 auxtrace_pages, auxtrace_overwrite);
1026
1027 return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
1028 }
1029
evlist__mmap(struct evlist * evlist,unsigned int pages)1030 int evlist__mmap(struct evlist *evlist, unsigned int pages)
1031 {
1032 return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
1033 }
1034
evlist__create_maps(struct evlist * evlist,struct target * target)1035 int evlist__create_maps(struct evlist *evlist, struct target *target)
1036 {
1037 bool all_threads = (target->per_thread && target->system_wide);
1038 struct perf_cpu_map *cpus;
1039 struct perf_thread_map *threads;
1040
1041 /*
1042 * If specify '-a' and '--per-thread' to perf record, perf record
1043 * will override '--per-thread'. target->per_thread = false and
1044 * target->system_wide = true.
1045 *
1046 * If specify '--per-thread' only to perf record,
1047 * target->per_thread = true and target->system_wide = false.
1048 *
1049 * So target->per_thread && target->system_wide is false.
1050 * For perf record, thread_map__new_str doesn't call
1051 * thread_map__new_all_cpus. That will keep perf record's
1052 * current behavior.
1053 *
1054 * For perf stat, it allows the case that target->per_thread and
1055 * target->system_wide are all true. It means to collect system-wide
1056 * per-thread data. thread_map__new_str will call
1057 * thread_map__new_all_cpus to enumerate all threads.
1058 */
1059 threads = thread_map__new_str(target->pid, target->tid, target->uid,
1060 all_threads);
1061
1062 if (!threads)
1063 return -1;
1064
1065 if (target__uses_dummy_map(target))
1066 cpus = perf_cpu_map__dummy_new();
1067 else
1068 cpus = perf_cpu_map__new(target->cpu_list);
1069
1070 if (!cpus)
1071 goto out_delete_threads;
1072
1073 evlist->core.has_user_cpus = !!target->cpu_list;
1074
1075 perf_evlist__set_maps(&evlist->core, cpus, threads);
1076
1077 /* as evlist now has references, put count here */
1078 perf_cpu_map__put(cpus);
1079 perf_thread_map__put(threads);
1080
1081 return 0;
1082
1083 out_delete_threads:
1084 perf_thread_map__put(threads);
1085 return -1;
1086 }
1087
evlist__apply_filters(struct evlist * evlist,struct evsel ** err_evsel)1088 int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
1089 {
1090 struct evsel *evsel;
1091 int err = 0;
1092
1093 evlist__for_each_entry(evlist, evsel) {
1094 /*
1095 * filters only work for tracepoint event, which doesn't have cpu limit.
1096 * So evlist and evsel should always be same.
1097 */
1098 if (evsel->filter) {
1099 err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
1100 if (err) {
1101 *err_evsel = evsel;
1102 break;
1103 }
1104 }
1105
1106 /*
1107 * non-tracepoint events can have BPF filters.
1108 */
1109 if (!list_empty(&evsel->bpf_filters)) {
1110 err = perf_bpf_filter__prepare(evsel);
1111 if (err) {
1112 *err_evsel = evsel;
1113 break;
1114 }
1115 }
1116 }
1117
1118 return err;
1119 }
1120
evlist__set_tp_filter(struct evlist * evlist,const char * filter)1121 int evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1122 {
1123 struct evsel *evsel;
1124 int err = 0;
1125
1126 if (filter == NULL)
1127 return -1;
1128
1129 evlist__for_each_entry(evlist, evsel) {
1130 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1131 continue;
1132
1133 err = evsel__set_filter(evsel, filter);
1134 if (err)
1135 break;
1136 }
1137
1138 return err;
1139 }
1140
evlist__append_tp_filter(struct evlist * evlist,const char * filter)1141 int evlist__append_tp_filter(struct evlist *evlist, const char *filter)
1142 {
1143 struct evsel *evsel;
1144 int err = 0;
1145
1146 if (filter == NULL)
1147 return -1;
1148
1149 evlist__for_each_entry(evlist, evsel) {
1150 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1151 continue;
1152
1153 err = evsel__append_tp_filter(evsel, filter);
1154 if (err)
1155 break;
1156 }
1157
1158 return err;
1159 }
1160
asprintf__tp_filter_pids(size_t npids,pid_t * pids)1161 char *asprintf__tp_filter_pids(size_t npids, pid_t *pids)
1162 {
1163 char *filter;
1164 size_t i;
1165
1166 for (i = 0; i < npids; ++i) {
1167 if (i == 0) {
1168 if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1169 return NULL;
1170 } else {
1171 char *tmp;
1172
1173 if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1174 goto out_free;
1175
1176 free(filter);
1177 filter = tmp;
1178 }
1179 }
1180
1181 return filter;
1182 out_free:
1183 free(filter);
1184 return NULL;
1185 }
1186
evlist__set_tp_filter_pids(struct evlist * evlist,size_t npids,pid_t * pids)1187 int evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1188 {
1189 char *filter = asprintf__tp_filter_pids(npids, pids);
1190 int ret = evlist__set_tp_filter(evlist, filter);
1191
1192 free(filter);
1193 return ret;
1194 }
1195
evlist__set_tp_filter_pid(struct evlist * evlist,pid_t pid)1196 int evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
1197 {
1198 return evlist__set_tp_filter_pids(evlist, 1, &pid);
1199 }
1200
evlist__append_tp_filter_pids(struct evlist * evlist,size_t npids,pid_t * pids)1201 int evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1202 {
1203 char *filter = asprintf__tp_filter_pids(npids, pids);
1204 int ret = evlist__append_tp_filter(evlist, filter);
1205
1206 free(filter);
1207 return ret;
1208 }
1209
evlist__append_tp_filter_pid(struct evlist * evlist,pid_t pid)1210 int evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
1211 {
1212 return evlist__append_tp_filter_pids(evlist, 1, &pid);
1213 }
1214
evlist__valid_sample_type(struct evlist * evlist)1215 bool evlist__valid_sample_type(struct evlist *evlist)
1216 {
1217 struct evsel *pos;
1218
1219 if (evlist->core.nr_entries == 1)
1220 return true;
1221
1222 if (evlist->id_pos < 0 || evlist->is_pos < 0)
1223 return false;
1224
1225 evlist__for_each_entry(evlist, pos) {
1226 if (pos->id_pos != evlist->id_pos ||
1227 pos->is_pos != evlist->is_pos)
1228 return false;
1229 }
1230
1231 return true;
1232 }
1233
__evlist__combined_sample_type(struct evlist * evlist)1234 u64 __evlist__combined_sample_type(struct evlist *evlist)
1235 {
1236 struct evsel *evsel;
1237
1238 if (evlist->combined_sample_type)
1239 return evlist->combined_sample_type;
1240
1241 evlist__for_each_entry(evlist, evsel)
1242 evlist->combined_sample_type |= evsel->core.attr.sample_type;
1243
1244 return evlist->combined_sample_type;
1245 }
1246
evlist__combined_sample_type(struct evlist * evlist)1247 u64 evlist__combined_sample_type(struct evlist *evlist)
1248 {
1249 evlist->combined_sample_type = 0;
1250 return __evlist__combined_sample_type(evlist);
1251 }
1252
evlist__combined_branch_type(struct evlist * evlist)1253 u64 evlist__combined_branch_type(struct evlist *evlist)
1254 {
1255 struct evsel *evsel;
1256 u64 branch_type = 0;
1257
1258 evlist__for_each_entry(evlist, evsel)
1259 branch_type |= evsel->core.attr.branch_sample_type;
1260 return branch_type;
1261 }
1262
evlist__valid_read_format(struct evlist * evlist)1263 bool evlist__valid_read_format(struct evlist *evlist)
1264 {
1265 struct evsel *first = evlist__first(evlist), *pos = first;
1266 u64 read_format = first->core.attr.read_format;
1267 u64 sample_type = first->core.attr.sample_type;
1268
1269 evlist__for_each_entry(evlist, pos) {
1270 if (read_format != pos->core.attr.read_format) {
1271 pr_debug("Read format differs %#" PRIx64 " vs %#" PRIx64 "\n",
1272 read_format, (u64)pos->core.attr.read_format);
1273 }
1274 }
1275
1276 /* PERF_SAMPLE_READ implies PERF_FORMAT_ID. */
1277 if ((sample_type & PERF_SAMPLE_READ) &&
1278 !(read_format & PERF_FORMAT_ID)) {
1279 return false;
1280 }
1281
1282 return true;
1283 }
1284
evlist__id_hdr_size(struct evlist * evlist)1285 u16 evlist__id_hdr_size(struct evlist *evlist)
1286 {
1287 struct evsel *first = evlist__first(evlist);
1288
1289 return first->core.attr.sample_id_all ? evsel__id_hdr_size(first) : 0;
1290 }
1291
evlist__valid_sample_id_all(struct evlist * evlist)1292 bool evlist__valid_sample_id_all(struct evlist *evlist)
1293 {
1294 struct evsel *first = evlist__first(evlist), *pos = first;
1295
1296 evlist__for_each_entry_continue(evlist, pos) {
1297 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1298 return false;
1299 }
1300
1301 return true;
1302 }
1303
evlist__sample_id_all(struct evlist * evlist)1304 bool evlist__sample_id_all(struct evlist *evlist)
1305 {
1306 struct evsel *first = evlist__first(evlist);
1307 return first->core.attr.sample_id_all;
1308 }
1309
evlist__set_selected(struct evlist * evlist,struct evsel * evsel)1310 void evlist__set_selected(struct evlist *evlist, struct evsel *evsel)
1311 {
1312 evlist->selected = evsel;
1313 }
1314
evlist__close(struct evlist * evlist)1315 void evlist__close(struct evlist *evlist)
1316 {
1317 struct evsel *evsel;
1318 struct evlist_cpu_iterator evlist_cpu_itr;
1319 struct affinity affinity;
1320
1321 /*
1322 * With perf record core.user_requested_cpus is usually NULL.
1323 * Use the old method to handle this for now.
1324 */
1325 if (!evlist->core.user_requested_cpus ||
1326 cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
1327 evlist__for_each_entry_reverse(evlist, evsel)
1328 evsel__close(evsel);
1329 return;
1330 }
1331
1332 if (affinity__setup(&affinity) < 0)
1333 return;
1334
1335 evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) {
1336 perf_evsel__close_cpu(&evlist_cpu_itr.evsel->core,
1337 evlist_cpu_itr.cpu_map_idx);
1338 }
1339
1340 affinity__cleanup(&affinity);
1341 evlist__for_each_entry_reverse(evlist, evsel) {
1342 perf_evsel__free_fd(&evsel->core);
1343 perf_evsel__free_id(&evsel->core);
1344 }
1345 perf_evlist__reset_id_hash(&evlist->core);
1346 }
1347
evlist__create_syswide_maps(struct evlist * evlist)1348 static int evlist__create_syswide_maps(struct evlist *evlist)
1349 {
1350 struct perf_cpu_map *cpus;
1351 struct perf_thread_map *threads;
1352
1353 /*
1354 * Try reading /sys/devices/system/cpu/online to get
1355 * an all cpus map.
1356 *
1357 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1358 * code needs an overhaul to properly forward the
1359 * error, and we may not want to do that fallback to a
1360 * default cpu identity map :-\
1361 */
1362 cpus = perf_cpu_map__new(NULL);
1363 if (!cpus)
1364 goto out;
1365
1366 threads = perf_thread_map__new_dummy();
1367 if (!threads)
1368 goto out_put;
1369
1370 perf_evlist__set_maps(&evlist->core, cpus, threads);
1371
1372 perf_thread_map__put(threads);
1373 out_put:
1374 perf_cpu_map__put(cpus);
1375 out:
1376 return -ENOMEM;
1377 }
1378
evlist__open(struct evlist * evlist)1379 int evlist__open(struct evlist *evlist)
1380 {
1381 struct evsel *evsel;
1382 int err;
1383
1384 /*
1385 * Default: one fd per CPU, all threads, aka systemwide
1386 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1387 */
1388 if (evlist->core.threads == NULL && evlist->core.user_requested_cpus == NULL) {
1389 err = evlist__create_syswide_maps(evlist);
1390 if (err < 0)
1391 goto out_err;
1392 }
1393
1394 evlist__update_id_pos(evlist);
1395
1396 evlist__for_each_entry(evlist, evsel) {
1397 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1398 if (err < 0)
1399 goto out_err;
1400 }
1401
1402 return 0;
1403 out_err:
1404 evlist__close(evlist);
1405 errno = -err;
1406 return err;
1407 }
1408
evlist__prepare_workload(struct evlist * evlist,struct target * target,const char * argv[],bool pipe_output,void (* exec_error)(int signo,siginfo_t * info,void * ucontext))1409 int evlist__prepare_workload(struct evlist *evlist, struct target *target, const char *argv[],
1410 bool pipe_output, void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1411 {
1412 int child_ready_pipe[2], go_pipe[2];
1413 char bf;
1414
1415 if (pipe(child_ready_pipe) < 0) {
1416 perror("failed to create 'ready' pipe");
1417 return -1;
1418 }
1419
1420 if (pipe(go_pipe) < 0) {
1421 perror("failed to create 'go' pipe");
1422 goto out_close_ready_pipe;
1423 }
1424
1425 evlist->workload.pid = fork();
1426 if (evlist->workload.pid < 0) {
1427 perror("failed to fork");
1428 goto out_close_pipes;
1429 }
1430
1431 if (!evlist->workload.pid) {
1432 int ret;
1433
1434 if (pipe_output)
1435 dup2(2, 1);
1436
1437 signal(SIGTERM, SIG_DFL);
1438
1439 close(child_ready_pipe[0]);
1440 close(go_pipe[1]);
1441 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1442
1443 /*
1444 * Change the name of this process not to confuse --exclude-perf users
1445 * that sees 'perf' in the window up to the execvp() and thinks that
1446 * perf samples are not being excluded.
1447 */
1448 prctl(PR_SET_NAME, "perf-exec");
1449
1450 /*
1451 * Tell the parent we're ready to go
1452 */
1453 close(child_ready_pipe[1]);
1454
1455 /*
1456 * Wait until the parent tells us to go.
1457 */
1458 ret = read(go_pipe[0], &bf, 1);
1459 /*
1460 * The parent will ask for the execvp() to be performed by
1461 * writing exactly one byte, in workload.cork_fd, usually via
1462 * evlist__start_workload().
1463 *
1464 * For cancelling the workload without actually running it,
1465 * the parent will just close workload.cork_fd, without writing
1466 * anything, i.e. read will return zero and we just exit()
1467 * here.
1468 */
1469 if (ret != 1) {
1470 if (ret == -1)
1471 perror("unable to read pipe");
1472 exit(ret);
1473 }
1474
1475 execvp(argv[0], (char **)argv);
1476
1477 if (exec_error) {
1478 union sigval val;
1479
1480 val.sival_int = errno;
1481 if (sigqueue(getppid(), SIGUSR1, val))
1482 perror(argv[0]);
1483 } else
1484 perror(argv[0]);
1485 exit(-1);
1486 }
1487
1488 if (exec_error) {
1489 struct sigaction act = {
1490 .sa_flags = SA_SIGINFO,
1491 .sa_sigaction = exec_error,
1492 };
1493 sigaction(SIGUSR1, &act, NULL);
1494 }
1495
1496 if (target__none(target)) {
1497 if (evlist->core.threads == NULL) {
1498 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1499 __func__, __LINE__);
1500 goto out_close_pipes;
1501 }
1502 perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1503 }
1504
1505 close(child_ready_pipe[1]);
1506 close(go_pipe[0]);
1507 /*
1508 * wait for child to settle
1509 */
1510 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1511 perror("unable to read pipe");
1512 goto out_close_pipes;
1513 }
1514
1515 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1516 evlist->workload.cork_fd = go_pipe[1];
1517 close(child_ready_pipe[0]);
1518 return 0;
1519
1520 out_close_pipes:
1521 close(go_pipe[0]);
1522 close(go_pipe[1]);
1523 out_close_ready_pipe:
1524 close(child_ready_pipe[0]);
1525 close(child_ready_pipe[1]);
1526 return -1;
1527 }
1528
evlist__start_workload(struct evlist * evlist)1529 int evlist__start_workload(struct evlist *evlist)
1530 {
1531 if (evlist->workload.cork_fd > 0) {
1532 char bf = 0;
1533 int ret;
1534 /*
1535 * Remove the cork, let it rip!
1536 */
1537 ret = write(evlist->workload.cork_fd, &bf, 1);
1538 if (ret < 0)
1539 perror("unable to write to pipe");
1540
1541 close(evlist->workload.cork_fd);
1542 return ret;
1543 }
1544
1545 return 0;
1546 }
1547
evlist__parse_sample(struct evlist * evlist,union perf_event * event,struct perf_sample * sample)1548 int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
1549 {
1550 struct evsel *evsel = evlist__event2evsel(evlist, event);
1551 int ret;
1552
1553 if (!evsel)
1554 return -EFAULT;
1555 ret = evsel__parse_sample(evsel, event, sample);
1556 if (ret)
1557 return ret;
1558 if (perf_guest && sample->id) {
1559 struct perf_sample_id *sid = evlist__id2sid(evlist, sample->id);
1560
1561 if (sid) {
1562 sample->machine_pid = sid->machine_pid;
1563 sample->vcpu = sid->vcpu.cpu;
1564 }
1565 }
1566 return 0;
1567 }
1568
evlist__parse_sample_timestamp(struct evlist * evlist,union perf_event * event,u64 * timestamp)1569 int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp)
1570 {
1571 struct evsel *evsel = evlist__event2evsel(evlist, event);
1572
1573 if (!evsel)
1574 return -EFAULT;
1575 return evsel__parse_sample_timestamp(evsel, event, timestamp);
1576 }
1577
evlist__strerror_open(struct evlist * evlist,int err,char * buf,size_t size)1578 int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
1579 {
1580 int printed, value;
1581 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1582
1583 switch (err) {
1584 case EACCES:
1585 case EPERM:
1586 printed = scnprintf(buf, size,
1587 "Error:\t%s.\n"
1588 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1589
1590 value = perf_event_paranoid();
1591
1592 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1593
1594 if (value >= 2) {
1595 printed += scnprintf(buf + printed, size - printed,
1596 "For your workloads it needs to be <= 1\nHint:\t");
1597 }
1598 printed += scnprintf(buf + printed, size - printed,
1599 "For system wide tracing it needs to be set to -1.\n");
1600
1601 printed += scnprintf(buf + printed, size - printed,
1602 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1603 "Hint:\tThe current value is %d.", value);
1604 break;
1605 case EINVAL: {
1606 struct evsel *first = evlist__first(evlist);
1607 int max_freq;
1608
1609 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1610 goto out_default;
1611
1612 if (first->core.attr.sample_freq < (u64)max_freq)
1613 goto out_default;
1614
1615 printed = scnprintf(buf, size,
1616 "Error:\t%s.\n"
1617 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1618 "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1619 emsg, max_freq, first->core.attr.sample_freq);
1620 break;
1621 }
1622 default:
1623 out_default:
1624 scnprintf(buf, size, "%s", emsg);
1625 break;
1626 }
1627
1628 return 0;
1629 }
1630
evlist__strerror_mmap(struct evlist * evlist,int err,char * buf,size_t size)1631 int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1632 {
1633 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1634 int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1635
1636 switch (err) {
1637 case EPERM:
1638 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1639 printed += scnprintf(buf + printed, size - printed,
1640 "Error:\t%s.\n"
1641 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1642 "Hint:\tTried using %zd kB.\n",
1643 emsg, pages_max_per_user, pages_attempted);
1644
1645 if (pages_attempted >= pages_max_per_user) {
1646 printed += scnprintf(buf + printed, size - printed,
1647 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1648 pages_max_per_user + pages_attempted);
1649 }
1650
1651 printed += scnprintf(buf + printed, size - printed,
1652 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1653 break;
1654 default:
1655 scnprintf(buf, size, "%s", emsg);
1656 break;
1657 }
1658
1659 return 0;
1660 }
1661
evlist__to_front(struct evlist * evlist,struct evsel * move_evsel)1662 void evlist__to_front(struct evlist *evlist, struct evsel *move_evsel)
1663 {
1664 struct evsel *evsel, *n;
1665 LIST_HEAD(move);
1666
1667 if (move_evsel == evlist__first(evlist))
1668 return;
1669
1670 evlist__for_each_entry_safe(evlist, n, evsel) {
1671 if (evsel__leader(evsel) == evsel__leader(move_evsel))
1672 list_move_tail(&evsel->core.node, &move);
1673 }
1674
1675 list_splice(&move, &evlist->core.entries);
1676 }
1677
evlist__get_tracking_event(struct evlist * evlist)1678 struct evsel *evlist__get_tracking_event(struct evlist *evlist)
1679 {
1680 struct evsel *evsel;
1681
1682 evlist__for_each_entry(evlist, evsel) {
1683 if (evsel->tracking)
1684 return evsel;
1685 }
1686
1687 return evlist__first(evlist);
1688 }
1689
evlist__set_tracking_event(struct evlist * evlist,struct evsel * tracking_evsel)1690 void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_evsel)
1691 {
1692 struct evsel *evsel;
1693
1694 if (tracking_evsel->tracking)
1695 return;
1696
1697 evlist__for_each_entry(evlist, evsel) {
1698 if (evsel != tracking_evsel)
1699 evsel->tracking = false;
1700 }
1701
1702 tracking_evsel->tracking = true;
1703 }
1704
evlist__find_evsel_by_str(struct evlist * evlist,const char * str)1705 struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str)
1706 {
1707 struct evsel *evsel;
1708
1709 evlist__for_each_entry(evlist, evsel) {
1710 if (!evsel->name)
1711 continue;
1712 if (evsel__name_is(evsel, str))
1713 return evsel;
1714 }
1715
1716 return NULL;
1717 }
1718
evlist__toggle_bkw_mmap(struct evlist * evlist,enum bkw_mmap_state state)1719 void evlist__toggle_bkw_mmap(struct evlist *evlist, enum bkw_mmap_state state)
1720 {
1721 enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1722 enum action {
1723 NONE,
1724 PAUSE,
1725 RESUME,
1726 } action = NONE;
1727
1728 if (!evlist->overwrite_mmap)
1729 return;
1730
1731 switch (old_state) {
1732 case BKW_MMAP_NOTREADY: {
1733 if (state != BKW_MMAP_RUNNING)
1734 goto state_err;
1735 break;
1736 }
1737 case BKW_MMAP_RUNNING: {
1738 if (state != BKW_MMAP_DATA_PENDING)
1739 goto state_err;
1740 action = PAUSE;
1741 break;
1742 }
1743 case BKW_MMAP_DATA_PENDING: {
1744 if (state != BKW_MMAP_EMPTY)
1745 goto state_err;
1746 break;
1747 }
1748 case BKW_MMAP_EMPTY: {
1749 if (state != BKW_MMAP_RUNNING)
1750 goto state_err;
1751 action = RESUME;
1752 break;
1753 }
1754 default:
1755 WARN_ONCE(1, "Shouldn't get there\n");
1756 }
1757
1758 evlist->bkw_mmap_state = state;
1759
1760 switch (action) {
1761 case PAUSE:
1762 evlist__pause(evlist);
1763 break;
1764 case RESUME:
1765 evlist__resume(evlist);
1766 break;
1767 case NONE:
1768 default:
1769 break;
1770 }
1771
1772 state_err:
1773 return;
1774 }
1775
evlist__exclude_kernel(struct evlist * evlist)1776 bool evlist__exclude_kernel(struct evlist *evlist)
1777 {
1778 struct evsel *evsel;
1779
1780 evlist__for_each_entry(evlist, evsel) {
1781 if (!evsel->core.attr.exclude_kernel)
1782 return false;
1783 }
1784
1785 return true;
1786 }
1787
1788 /*
1789 * Events in data file are not collect in groups, but we still want
1790 * the group display. Set the artificial group and set the leader's
1791 * forced_leader flag to notify the display code.
1792 */
evlist__force_leader(struct evlist * evlist)1793 void evlist__force_leader(struct evlist *evlist)
1794 {
1795 if (evlist__nr_groups(evlist) == 0) {
1796 struct evsel *leader = evlist__first(evlist);
1797
1798 evlist__set_leader(evlist);
1799 leader->forced_leader = true;
1800 }
1801 }
1802
evlist__reset_weak_group(struct evlist * evsel_list,struct evsel * evsel,bool close)1803 struct evsel *evlist__reset_weak_group(struct evlist *evsel_list, struct evsel *evsel, bool close)
1804 {
1805 struct evsel *c2, *leader;
1806 bool is_open = true;
1807
1808 leader = evsel__leader(evsel);
1809
1810 pr_debug("Weak group for %s/%d failed\n",
1811 leader->name, leader->core.nr_members);
1812
1813 /*
1814 * for_each_group_member doesn't work here because it doesn't
1815 * include the first entry.
1816 */
1817 evlist__for_each_entry(evsel_list, c2) {
1818 if (c2 == evsel)
1819 is_open = false;
1820 if (evsel__has_leader(c2, leader)) {
1821 if (is_open && close)
1822 perf_evsel__close(&c2->core);
1823 /*
1824 * We want to close all members of the group and reopen
1825 * them. Some events, like Intel topdown, require being
1826 * in a group and so keep these in the group.
1827 */
1828 evsel__remove_from_group(c2, leader);
1829
1830 /*
1831 * Set this for all former members of the group
1832 * to indicate they get reopened.
1833 */
1834 c2->reset_group = true;
1835 }
1836 }
1837 /* Reset the leader count if all entries were removed. */
1838 if (leader->core.nr_members == 1)
1839 leader->core.nr_members = 0;
1840 return leader;
1841 }
1842
evlist__parse_control_fifo(const char * str,int * ctl_fd,int * ctl_fd_ack,bool * ctl_fd_close)1843 static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1844 {
1845 char *s, *p;
1846 int ret = 0, fd;
1847
1848 if (strncmp(str, "fifo:", 5))
1849 return -EINVAL;
1850
1851 str += 5;
1852 if (!*str || *str == ',')
1853 return -EINVAL;
1854
1855 s = strdup(str);
1856 if (!s)
1857 return -ENOMEM;
1858
1859 p = strchr(s, ',');
1860 if (p)
1861 *p = '\0';
1862
1863 /*
1864 * O_RDWR avoids POLLHUPs which is necessary to allow the other
1865 * end of a FIFO to be repeatedly opened and closed.
1866 */
1867 fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1868 if (fd < 0) {
1869 pr_err("Failed to open '%s'\n", s);
1870 ret = -errno;
1871 goto out_free;
1872 }
1873 *ctl_fd = fd;
1874 *ctl_fd_close = true;
1875
1876 if (p && *++p) {
1877 /* O_RDWR | O_NONBLOCK means the other end need not be open */
1878 fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1879 if (fd < 0) {
1880 pr_err("Failed to open '%s'\n", p);
1881 ret = -errno;
1882 goto out_free;
1883 }
1884 *ctl_fd_ack = fd;
1885 }
1886
1887 out_free:
1888 free(s);
1889 return ret;
1890 }
1891
evlist__parse_control(const char * str,int * ctl_fd,int * ctl_fd_ack,bool * ctl_fd_close)1892 int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1893 {
1894 char *comma = NULL, *endptr = NULL;
1895
1896 *ctl_fd_close = false;
1897
1898 if (strncmp(str, "fd:", 3))
1899 return evlist__parse_control_fifo(str, ctl_fd, ctl_fd_ack, ctl_fd_close);
1900
1901 *ctl_fd = strtoul(&str[3], &endptr, 0);
1902 if (endptr == &str[3])
1903 return -EINVAL;
1904
1905 comma = strchr(str, ',');
1906 if (comma) {
1907 if (endptr != comma)
1908 return -EINVAL;
1909
1910 *ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
1911 if (endptr == comma + 1 || *endptr != '\0')
1912 return -EINVAL;
1913 }
1914
1915 return 0;
1916 }
1917
evlist__close_control(int ctl_fd,int ctl_fd_ack,bool * ctl_fd_close)1918 void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close)
1919 {
1920 if (*ctl_fd_close) {
1921 *ctl_fd_close = false;
1922 close(ctl_fd);
1923 if (ctl_fd_ack >= 0)
1924 close(ctl_fd_ack);
1925 }
1926 }
1927
evlist__initialize_ctlfd(struct evlist * evlist,int fd,int ack)1928 int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
1929 {
1930 if (fd == -1) {
1931 pr_debug("Control descriptor is not initialized\n");
1932 return 0;
1933 }
1934
1935 evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
1936 fdarray_flag__nonfilterable |
1937 fdarray_flag__non_perf_event);
1938 if (evlist->ctl_fd.pos < 0) {
1939 evlist->ctl_fd.pos = -1;
1940 pr_err("Failed to add ctl fd entry: %m\n");
1941 return -1;
1942 }
1943
1944 evlist->ctl_fd.fd = fd;
1945 evlist->ctl_fd.ack = ack;
1946
1947 return 0;
1948 }
1949
evlist__ctlfd_initialized(struct evlist * evlist)1950 bool evlist__ctlfd_initialized(struct evlist *evlist)
1951 {
1952 return evlist->ctl_fd.pos >= 0;
1953 }
1954
evlist__finalize_ctlfd(struct evlist * evlist)1955 int evlist__finalize_ctlfd(struct evlist *evlist)
1956 {
1957 struct pollfd *entries = evlist->core.pollfd.entries;
1958
1959 if (!evlist__ctlfd_initialized(evlist))
1960 return 0;
1961
1962 entries[evlist->ctl_fd.pos].fd = -1;
1963 entries[evlist->ctl_fd.pos].events = 0;
1964 entries[evlist->ctl_fd.pos].revents = 0;
1965
1966 evlist->ctl_fd.pos = -1;
1967 evlist->ctl_fd.ack = -1;
1968 evlist->ctl_fd.fd = -1;
1969
1970 return 0;
1971 }
1972
evlist__ctlfd_recv(struct evlist * evlist,enum evlist_ctl_cmd * cmd,char * cmd_data,size_t data_size)1973 static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
1974 char *cmd_data, size_t data_size)
1975 {
1976 int err;
1977 char c;
1978 size_t bytes_read = 0;
1979
1980 *cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1981 memset(cmd_data, 0, data_size);
1982 data_size--;
1983
1984 do {
1985 err = read(evlist->ctl_fd.fd, &c, 1);
1986 if (err > 0) {
1987 if (c == '\n' || c == '\0')
1988 break;
1989 cmd_data[bytes_read++] = c;
1990 if (bytes_read == data_size)
1991 break;
1992 continue;
1993 } else if (err == -1) {
1994 if (errno == EINTR)
1995 continue;
1996 if (errno == EAGAIN || errno == EWOULDBLOCK)
1997 err = 0;
1998 else
1999 pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
2000 }
2001 break;
2002 } while (1);
2003
2004 pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
2005 bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
2006
2007 if (bytes_read > 0) {
2008 if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
2009 (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
2010 *cmd = EVLIST_CTL_CMD_ENABLE;
2011 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
2012 (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) {
2013 *cmd = EVLIST_CTL_CMD_DISABLE;
2014 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_SNAPSHOT_TAG,
2015 (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
2016 *cmd = EVLIST_CTL_CMD_SNAPSHOT;
2017 pr_debug("is snapshot\n");
2018 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG,
2019 (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) {
2020 *cmd = EVLIST_CTL_CMD_EVLIST;
2021 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG,
2022 (sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) {
2023 *cmd = EVLIST_CTL_CMD_STOP;
2024 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_PING_TAG,
2025 (sizeof(EVLIST_CTL_CMD_PING_TAG)-1))) {
2026 *cmd = EVLIST_CTL_CMD_PING;
2027 }
2028 }
2029
2030 return bytes_read ? (int)bytes_read : err;
2031 }
2032
evlist__ctlfd_ack(struct evlist * evlist)2033 int evlist__ctlfd_ack(struct evlist *evlist)
2034 {
2035 int err;
2036
2037 if (evlist->ctl_fd.ack == -1)
2038 return 0;
2039
2040 err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG,
2041 sizeof(EVLIST_CTL_CMD_ACK_TAG));
2042 if (err == -1)
2043 pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack);
2044
2045 return err;
2046 }
2047
get_cmd_arg(char * cmd_data,size_t cmd_size,char ** arg)2048 static int get_cmd_arg(char *cmd_data, size_t cmd_size, char **arg)
2049 {
2050 char *data = cmd_data + cmd_size;
2051
2052 /* no argument */
2053 if (!*data)
2054 return 0;
2055
2056 /* there's argument */
2057 if (*data == ' ') {
2058 *arg = data + 1;
2059 return 1;
2060 }
2061
2062 /* malformed */
2063 return -1;
2064 }
2065
evlist__ctlfd_enable(struct evlist * evlist,char * cmd_data,bool enable)2066 static int evlist__ctlfd_enable(struct evlist *evlist, char *cmd_data, bool enable)
2067 {
2068 struct evsel *evsel;
2069 char *name;
2070 int err;
2071
2072 err = get_cmd_arg(cmd_data,
2073 enable ? sizeof(EVLIST_CTL_CMD_ENABLE_TAG) - 1 :
2074 sizeof(EVLIST_CTL_CMD_DISABLE_TAG) - 1,
2075 &name);
2076 if (err < 0) {
2077 pr_info("failed: wrong command\n");
2078 return -1;
2079 }
2080
2081 if (err) {
2082 evsel = evlist__find_evsel_by_str(evlist, name);
2083 if (evsel) {
2084 if (enable)
2085 evlist__enable_evsel(evlist, name);
2086 else
2087 evlist__disable_evsel(evlist, name);
2088 pr_info("Event %s %s\n", evsel->name,
2089 enable ? "enabled" : "disabled");
2090 } else {
2091 pr_info("failed: can't find '%s' event\n", name);
2092 }
2093 } else {
2094 if (enable) {
2095 evlist__enable(evlist);
2096 pr_info(EVLIST_ENABLED_MSG);
2097 } else {
2098 evlist__disable(evlist);
2099 pr_info(EVLIST_DISABLED_MSG);
2100 }
2101 }
2102
2103 return 0;
2104 }
2105
evlist__ctlfd_list(struct evlist * evlist,char * cmd_data)2106 static int evlist__ctlfd_list(struct evlist *evlist, char *cmd_data)
2107 {
2108 struct perf_attr_details details = { .verbose = false, };
2109 struct evsel *evsel;
2110 char *arg;
2111 int err;
2112
2113 err = get_cmd_arg(cmd_data,
2114 sizeof(EVLIST_CTL_CMD_EVLIST_TAG) - 1,
2115 &arg);
2116 if (err < 0) {
2117 pr_info("failed: wrong command\n");
2118 return -1;
2119 }
2120
2121 if (err) {
2122 if (!strcmp(arg, "-v")) {
2123 details.verbose = true;
2124 } else if (!strcmp(arg, "-g")) {
2125 details.event_group = true;
2126 } else if (!strcmp(arg, "-F")) {
2127 details.freq = true;
2128 } else {
2129 pr_info("failed: wrong command\n");
2130 return -1;
2131 }
2132 }
2133
2134 evlist__for_each_entry(evlist, evsel)
2135 evsel__fprintf(evsel, &details, stderr);
2136
2137 return 0;
2138 }
2139
evlist__ctlfd_process(struct evlist * evlist,enum evlist_ctl_cmd * cmd)2140 int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
2141 {
2142 int err = 0;
2143 char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
2144 int ctlfd_pos = evlist->ctl_fd.pos;
2145 struct pollfd *entries = evlist->core.pollfd.entries;
2146
2147 if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
2148 return 0;
2149
2150 if (entries[ctlfd_pos].revents & POLLIN) {
2151 err = evlist__ctlfd_recv(evlist, cmd, cmd_data,
2152 EVLIST_CTL_CMD_MAX_LEN);
2153 if (err > 0) {
2154 switch (*cmd) {
2155 case EVLIST_CTL_CMD_ENABLE:
2156 case EVLIST_CTL_CMD_DISABLE:
2157 err = evlist__ctlfd_enable(evlist, cmd_data,
2158 *cmd == EVLIST_CTL_CMD_ENABLE);
2159 break;
2160 case EVLIST_CTL_CMD_EVLIST:
2161 err = evlist__ctlfd_list(evlist, cmd_data);
2162 break;
2163 case EVLIST_CTL_CMD_SNAPSHOT:
2164 case EVLIST_CTL_CMD_STOP:
2165 case EVLIST_CTL_CMD_PING:
2166 break;
2167 case EVLIST_CTL_CMD_ACK:
2168 case EVLIST_CTL_CMD_UNSUPPORTED:
2169 default:
2170 pr_debug("ctlfd: unsupported %d\n", *cmd);
2171 break;
2172 }
2173 if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED ||
2174 *cmd == EVLIST_CTL_CMD_SNAPSHOT))
2175 evlist__ctlfd_ack(evlist);
2176 }
2177 }
2178
2179 if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR))
2180 evlist__finalize_ctlfd(evlist);
2181 else
2182 entries[ctlfd_pos].revents = 0;
2183
2184 return err;
2185 }
2186
2187 /**
2188 * struct event_enable_time - perf record -D/--delay single time range.
2189 * @start: start of time range to enable events in milliseconds
2190 * @end: end of time range to enable events in milliseconds
2191 *
2192 * N.B. this structure is also accessed as an array of int.
2193 */
2194 struct event_enable_time {
2195 int start;
2196 int end;
2197 };
2198
parse_event_enable_time(const char * str,struct event_enable_time * range,bool first)2199 static int parse_event_enable_time(const char *str, struct event_enable_time *range, bool first)
2200 {
2201 const char *fmt = first ? "%u - %u %n" : " , %u - %u %n";
2202 int ret, start, end, n;
2203
2204 ret = sscanf(str, fmt, &start, &end, &n);
2205 if (ret != 2 || end <= start)
2206 return -EINVAL;
2207 if (range) {
2208 range->start = start;
2209 range->end = end;
2210 }
2211 return n;
2212 }
2213
parse_event_enable_times(const char * str,struct event_enable_time * range)2214 static ssize_t parse_event_enable_times(const char *str, struct event_enable_time *range)
2215 {
2216 int incr = !!range;
2217 bool first = true;
2218 ssize_t ret, cnt;
2219
2220 for (cnt = 0; *str; cnt++) {
2221 ret = parse_event_enable_time(str, range, first);
2222 if (ret < 0)
2223 return ret;
2224 /* Check no overlap */
2225 if (!first && range && range->start <= range[-1].end)
2226 return -EINVAL;
2227 str += ret;
2228 range += incr;
2229 first = false;
2230 }
2231 return cnt;
2232 }
2233
2234 /**
2235 * struct event_enable_timer - control structure for perf record -D/--delay.
2236 * @evlist: event list
2237 * @times: time ranges that events are enabled (N.B. this is also accessed as an
2238 * array of int)
2239 * @times_cnt: number of time ranges
2240 * @timerfd: timer file descriptor
2241 * @pollfd_pos: position in @evlist array of file descriptors to poll (fdarray)
2242 * @times_step: current position in (int *)@times)[],
2243 * refer event_enable_timer__process()
2244 *
2245 * Note, this structure is only used when there are time ranges, not when there
2246 * is only an initial delay.
2247 */
2248 struct event_enable_timer {
2249 struct evlist *evlist;
2250 struct event_enable_time *times;
2251 size_t times_cnt;
2252 int timerfd;
2253 int pollfd_pos;
2254 size_t times_step;
2255 };
2256
str_to_delay(const char * str)2257 static int str_to_delay(const char *str)
2258 {
2259 char *endptr;
2260 long d;
2261
2262 d = strtol(str, &endptr, 10);
2263 if (*endptr || d > INT_MAX || d < -1)
2264 return 0;
2265 return d;
2266 }
2267
evlist__parse_event_enable_time(struct evlist * evlist,struct record_opts * opts,const char * str,int unset)2268 int evlist__parse_event_enable_time(struct evlist *evlist, struct record_opts *opts,
2269 const char *str, int unset)
2270 {
2271 enum fdarray_flags flags = fdarray_flag__nonfilterable | fdarray_flag__non_perf_event;
2272 struct event_enable_timer *eet;
2273 ssize_t times_cnt;
2274 ssize_t ret;
2275 int err;
2276
2277 if (unset)
2278 return 0;
2279
2280 opts->target.initial_delay = str_to_delay(str);
2281 if (opts->target.initial_delay)
2282 return 0;
2283
2284 ret = parse_event_enable_times(str, NULL);
2285 if (ret < 0)
2286 return ret;
2287
2288 times_cnt = ret;
2289 if (times_cnt == 0)
2290 return -EINVAL;
2291
2292 eet = zalloc(sizeof(*eet));
2293 if (!eet)
2294 return -ENOMEM;
2295
2296 eet->times = calloc(times_cnt, sizeof(*eet->times));
2297 if (!eet->times) {
2298 err = -ENOMEM;
2299 goto free_eet;
2300 }
2301
2302 if (parse_event_enable_times(str, eet->times) != times_cnt) {
2303 err = -EINVAL;
2304 goto free_eet_times;
2305 }
2306
2307 eet->times_cnt = times_cnt;
2308
2309 eet->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
2310 if (eet->timerfd == -1) {
2311 err = -errno;
2312 pr_err("timerfd_create failed: %s\n", strerror(errno));
2313 goto free_eet_times;
2314 }
2315
2316 eet->pollfd_pos = perf_evlist__add_pollfd(&evlist->core, eet->timerfd, NULL, POLLIN, flags);
2317 if (eet->pollfd_pos < 0) {
2318 err = eet->pollfd_pos;
2319 goto close_timerfd;
2320 }
2321
2322 eet->evlist = evlist;
2323 evlist->eet = eet;
2324 opts->target.initial_delay = eet->times[0].start;
2325
2326 return 0;
2327
2328 close_timerfd:
2329 close(eet->timerfd);
2330 free_eet_times:
2331 zfree(&eet->times);
2332 free_eet:
2333 free(eet);
2334 return err;
2335 }
2336
event_enable_timer__set_timer(struct event_enable_timer * eet,int ms)2337 static int event_enable_timer__set_timer(struct event_enable_timer *eet, int ms)
2338 {
2339 struct itimerspec its = {
2340 .it_value.tv_sec = ms / MSEC_PER_SEC,
2341 .it_value.tv_nsec = (ms % MSEC_PER_SEC) * NSEC_PER_MSEC,
2342 };
2343 int err = 0;
2344
2345 if (timerfd_settime(eet->timerfd, 0, &its, NULL) < 0) {
2346 err = -errno;
2347 pr_err("timerfd_settime failed: %s\n", strerror(errno));
2348 }
2349 return err;
2350 }
2351
event_enable_timer__start(struct event_enable_timer * eet)2352 int event_enable_timer__start(struct event_enable_timer *eet)
2353 {
2354 int ms;
2355
2356 if (!eet)
2357 return 0;
2358
2359 ms = eet->times[0].end - eet->times[0].start;
2360 eet->times_step = 1;
2361
2362 return event_enable_timer__set_timer(eet, ms);
2363 }
2364
event_enable_timer__process(struct event_enable_timer * eet)2365 int event_enable_timer__process(struct event_enable_timer *eet)
2366 {
2367 struct pollfd *entries;
2368 short revents;
2369
2370 if (!eet)
2371 return 0;
2372
2373 entries = eet->evlist->core.pollfd.entries;
2374 revents = entries[eet->pollfd_pos].revents;
2375 entries[eet->pollfd_pos].revents = 0;
2376
2377 if (revents & POLLIN) {
2378 size_t step = eet->times_step;
2379 size_t pos = step / 2;
2380
2381 if (step & 1) {
2382 evlist__disable_non_dummy(eet->evlist);
2383 pr_info(EVLIST_DISABLED_MSG);
2384 if (pos >= eet->times_cnt - 1) {
2385 /* Disarm timer */
2386 event_enable_timer__set_timer(eet, 0);
2387 return 1; /* Stop */
2388 }
2389 } else {
2390 evlist__enable_non_dummy(eet->evlist);
2391 pr_info(EVLIST_ENABLED_MSG);
2392 }
2393
2394 step += 1;
2395 pos = step / 2;
2396
2397 if (pos < eet->times_cnt) {
2398 int *times = (int *)eet->times; /* Accessing 'times' as array of int */
2399 int ms = times[step] - times[step - 1];
2400
2401 eet->times_step = step;
2402 return event_enable_timer__set_timer(eet, ms);
2403 }
2404 }
2405
2406 return 0;
2407 }
2408
event_enable_timer__exit(struct event_enable_timer ** ep)2409 void event_enable_timer__exit(struct event_enable_timer **ep)
2410 {
2411 if (!ep || !*ep)
2412 return;
2413 zfree(&(*ep)->times);
2414 zfree(ep);
2415 }
2416
evlist__find_evsel(struct evlist * evlist,int idx)2417 struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
2418 {
2419 struct evsel *evsel;
2420
2421 evlist__for_each_entry(evlist, evsel) {
2422 if (evsel->core.idx == idx)
2423 return evsel;
2424 }
2425 return NULL;
2426 }
2427
evlist__scnprintf_evsels(struct evlist * evlist,size_t size,char * bf)2428 int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf)
2429 {
2430 struct evsel *evsel;
2431 int printed = 0;
2432
2433 evlist__for_each_entry(evlist, evsel) {
2434 if (evsel__is_dummy_event(evsel))
2435 continue;
2436 if (size > (strlen(evsel__name(evsel)) + (printed ? 2 : 1))) {
2437 printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "," : "", evsel__name(evsel));
2438 } else {
2439 printed += scnprintf(bf + printed, size - printed, "%s...", printed ? "," : "");
2440 break;
2441 }
2442 }
2443
2444 return printed;
2445 }
2446
evlist__check_mem_load_aux(struct evlist * evlist)2447 void evlist__check_mem_load_aux(struct evlist *evlist)
2448 {
2449 struct evsel *leader, *evsel, *pos;
2450
2451 /*
2452 * For some platforms, the 'mem-loads' event is required to use
2453 * together with 'mem-loads-aux' within a group and 'mem-loads-aux'
2454 * must be the group leader. Now we disable this group before reporting
2455 * because 'mem-loads-aux' is just an auxiliary event. It doesn't carry
2456 * any valid memory load information.
2457 */
2458 evlist__for_each_entry(evlist, evsel) {
2459 leader = evsel__leader(evsel);
2460 if (leader == evsel)
2461 continue;
2462
2463 if (leader->name && strstr(leader->name, "mem-loads-aux")) {
2464 for_each_group_evsel(pos, leader) {
2465 evsel__set_leader(pos, pos);
2466 pos->core.nr_members = 0;
2467 }
2468 }
2469 }
2470 }
2471
2472 /**
2473 * evlist__warn_user_requested_cpus() - Check each evsel against requested CPUs
2474 * and warn if the user CPU list is inapplicable for the event's PMU's
2475 * CPUs. Not core PMUs list a CPU in sysfs, but this may be overwritten by a
2476 * user requested CPU and so any online CPU is applicable. Core PMUs handle
2477 * events on the CPUs in their list and otherwise the event isn't supported.
2478 * @evlist: The list of events being checked.
2479 * @cpu_list: The user provided list of CPUs.
2480 */
evlist__warn_user_requested_cpus(struct evlist * evlist,const char * cpu_list)2481 void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_list)
2482 {
2483 struct perf_cpu_map *user_requested_cpus;
2484 struct evsel *pos;
2485
2486 if (!cpu_list)
2487 return;
2488
2489 user_requested_cpus = perf_cpu_map__new(cpu_list);
2490 if (!user_requested_cpus)
2491 return;
2492
2493 evlist__for_each_entry(evlist, pos) {
2494 struct perf_cpu_map *intersect, *to_test;
2495 const struct perf_pmu *pmu = evsel__find_pmu(pos);
2496
2497 to_test = pmu && pmu->is_core ? pmu->cpus : cpu_map__online();
2498 intersect = perf_cpu_map__intersect(to_test, user_requested_cpus);
2499 if (!perf_cpu_map__equal(intersect, user_requested_cpus)) {
2500 char buf[128];
2501
2502 cpu_map__snprint(to_test, buf, sizeof(buf));
2503 pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n",
2504 cpu_list, pmu ? pmu->name : "cpu", buf, evsel__name(pos));
2505 }
2506 perf_cpu_map__put(intersect);
2507 }
2508 perf_cpu_map__put(user_requested_cpus);
2509 }
2510