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1/*
2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
3 *
4 * Parts came from builtin-{top,stat,record}.c, see those files for further
5 * copyright notes.
6 *
7 * Released under the GPL v2. (and only v2, not any later version)
8 */
9#include "util.h"
10#include <api/fs/fs.h>
11#include <errno.h>
12#include <inttypes.h>
13#include <poll.h>
14#include "cpumap.h"
15#include "thread_map.h"
16#include "target.h"
17#include "evlist.h"
18#include "evsel.h"
19#include "debug.h"
20#include "units.h"
21#include "asm/bug.h"
22#include <signal.h>
23#include <unistd.h>
24
25#include "parse-events.h"
26#include <subcmd/parse-options.h>
27
28#include <fcntl.h>
29#include <sys/ioctl.h>
30#include <sys/mman.h>
31
32#include <linux/bitops.h>
33#include <linux/hash.h>
34#include <linux/log2.h>
35#include <linux/err.h>
36
37#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
38#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
39
40void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
41 struct thread_map *threads)
42{
43 int i;
44
45 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
46 INIT_HLIST_HEAD(&evlist->heads[i]);
47 INIT_LIST_HEAD(&evlist->entries);
48 perf_evlist__set_maps(evlist, cpus, threads);
49 fdarray__init(&evlist->pollfd, 64);
50 evlist->workload.pid = -1;
51 evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
52}
53
54struct perf_evlist *perf_evlist__new(void)
55{
56 struct perf_evlist *evlist = zalloc(sizeof(*evlist));
57
58 if (evlist != NULL)
59 perf_evlist__init(evlist, NULL, NULL);
60
61 return evlist;
62}
63
64struct perf_evlist *perf_evlist__new_default(void)
65{
66 struct perf_evlist *evlist = perf_evlist__new();
67
68 if (evlist && perf_evlist__add_default(evlist)) {
69 perf_evlist__delete(evlist);
70 evlist = NULL;
71 }
72
73 return evlist;
74}
75
76struct perf_evlist *perf_evlist__new_dummy(void)
77{
78 struct perf_evlist *evlist = perf_evlist__new();
79
80 if (evlist && perf_evlist__add_dummy(evlist)) {
81 perf_evlist__delete(evlist);
82 evlist = NULL;
83 }
84
85 return evlist;
86}
87
88/**
89 * perf_evlist__set_id_pos - set the positions of event ids.
90 * @evlist: selected event list
91 *
92 * Events with compatible sample types all have the same id_pos
93 * and is_pos. For convenience, put a copy on evlist.
94 */
95void perf_evlist__set_id_pos(struct perf_evlist *evlist)
96{
97 struct perf_evsel *first = perf_evlist__first(evlist);
98
99 evlist->id_pos = first->id_pos;
100 evlist->is_pos = first->is_pos;
101}
102
103static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
104{
105 struct perf_evsel *evsel;
106
107 evlist__for_each_entry(evlist, evsel)
108 perf_evsel__calc_id_pos(evsel);
109
110 perf_evlist__set_id_pos(evlist);
111}
112
113static void perf_evlist__purge(struct perf_evlist *evlist)
114{
115 struct perf_evsel *pos, *n;
116
117 evlist__for_each_entry_safe(evlist, n, pos) {
118 list_del_init(&pos->node);
119 pos->evlist = NULL;
120 perf_evsel__delete(pos);
121 }
122
123 evlist->nr_entries = 0;
124}
125
126void perf_evlist__exit(struct perf_evlist *evlist)
127{
128 zfree(&evlist->mmap);
129 zfree(&evlist->overwrite_mmap);
130 fdarray__exit(&evlist->pollfd);
131}
132
133void perf_evlist__delete(struct perf_evlist *evlist)
134{
135 if (evlist == NULL)
136 return;
137
138 perf_evlist__munmap(evlist);
139 perf_evlist__close(evlist);
140 cpu_map__put(evlist->cpus);
141 thread_map__put(evlist->threads);
142 evlist->cpus = NULL;
143 evlist->threads = NULL;
144 perf_evlist__purge(evlist);
145 perf_evlist__exit(evlist);
146 free(evlist);
147}
148
149static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
150 struct perf_evsel *evsel)
151{
152 /*
153 * We already have cpus for evsel (via PMU sysfs) so
154 * keep it, if there's no target cpu list defined.
155 */
156 if (!evsel->own_cpus || evlist->has_user_cpus) {
157 cpu_map__put(evsel->cpus);
158 evsel->cpus = cpu_map__get(evlist->cpus);
159 } else if (evsel->cpus != evsel->own_cpus) {
160 cpu_map__put(evsel->cpus);
161 evsel->cpus = cpu_map__get(evsel->own_cpus);
162 }
163
164 thread_map__put(evsel->threads);
165 evsel->threads = thread_map__get(evlist->threads);
166}
167
168static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
169{
170 struct perf_evsel *evsel;
171
172 evlist__for_each_entry(evlist, evsel)
173 __perf_evlist__propagate_maps(evlist, evsel);
174}
175
176void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
177{
178 entry->evlist = evlist;
179 list_add_tail(&entry->node, &evlist->entries);
180 entry->idx = evlist->nr_entries;
181 entry->tracking = !entry->idx;
182
183 if (!evlist->nr_entries++)
184 perf_evlist__set_id_pos(evlist);
185
186 __perf_evlist__propagate_maps(evlist, entry);
187}
188
189void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
190{
191 evsel->evlist = NULL;
192 list_del_init(&evsel->node);
193 evlist->nr_entries -= 1;
194}
195
196void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
197 struct list_head *list)
198{
199 struct perf_evsel *evsel, *temp;
200
201 __evlist__for_each_entry_safe(list, temp, evsel) {
202 list_del_init(&evsel->node);
203 perf_evlist__add(evlist, evsel);
204 }
205}
206
207void __perf_evlist__set_leader(struct list_head *list)
208{
209 struct perf_evsel *evsel, *leader;
210
211 leader = list_entry(list->next, struct perf_evsel, node);
212 evsel = list_entry(list->prev, struct perf_evsel, node);
213
214 leader->nr_members = evsel->idx - leader->idx + 1;
215
216 __evlist__for_each_entry(list, evsel) {
217 evsel->leader = leader;
218 }
219}
220
221void perf_evlist__set_leader(struct perf_evlist *evlist)
222{
223 if (evlist->nr_entries) {
224 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
225 __perf_evlist__set_leader(&evlist->entries);
226 }
227}
228
229void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr)
230{
231 attr->precise_ip = 3;
232
233 while (attr->precise_ip != 0) {
234 int fd = sys_perf_event_open(attr, 0, -1, -1, 0);
235 if (fd != -1) {
236 close(fd);
237 break;
238 }
239 --attr->precise_ip;
240 }
241}
242
243int __perf_evlist__add_default(struct perf_evlist *evlist, bool precise)
244{
245 struct perf_evsel *evsel = perf_evsel__new_cycles(precise);
246
247 if (evsel == NULL)
248 return -ENOMEM;
249
250 perf_evlist__add(evlist, evsel);
251 return 0;
252}
253
254int perf_evlist__add_dummy(struct perf_evlist *evlist)
255{
256 struct perf_event_attr attr = {
257 .type = PERF_TYPE_SOFTWARE,
258 .config = PERF_COUNT_SW_DUMMY,
259 .size = sizeof(attr), /* to capture ABI version */
260 };
261 struct perf_evsel *evsel = perf_evsel__new_idx(&attr, evlist->nr_entries);
262
263 if (evsel == NULL)
264 return -ENOMEM;
265
266 perf_evlist__add(evlist, evsel);
267 return 0;
268}
269
270static int perf_evlist__add_attrs(struct perf_evlist *evlist,
271 struct perf_event_attr *attrs, size_t nr_attrs)
272{
273 struct perf_evsel *evsel, *n;
274 LIST_HEAD(head);
275 size_t i;
276
277 for (i = 0; i < nr_attrs; i++) {
278 evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
279 if (evsel == NULL)
280 goto out_delete_partial_list;
281 list_add_tail(&evsel->node, &head);
282 }
283
284 perf_evlist__splice_list_tail(evlist, &head);
285
286 return 0;
287
288out_delete_partial_list:
289 __evlist__for_each_entry_safe(&head, n, evsel)
290 perf_evsel__delete(evsel);
291 return -1;
292}
293
294int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
295 struct perf_event_attr *attrs, size_t nr_attrs)
296{
297 size_t i;
298
299 for (i = 0; i < nr_attrs; i++)
300 event_attr_init(attrs + i);
301
302 return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
303}
304
305struct perf_evsel *
306perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
307{
308 struct perf_evsel *evsel;
309
310 evlist__for_each_entry(evlist, evsel) {
311 if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
312 (int)evsel->attr.config == id)
313 return evsel;
314 }
315
316 return NULL;
317}
318
319struct perf_evsel *
320perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
321 const char *name)
322{
323 struct perf_evsel *evsel;
324
325 evlist__for_each_entry(evlist, evsel) {
326 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
327 (strcmp(evsel->name, name) == 0))
328 return evsel;
329 }
330
331 return NULL;
332}
333
334int perf_evlist__add_newtp(struct perf_evlist *evlist,
335 const char *sys, const char *name, void *handler)
336{
337 struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
338
339 if (IS_ERR(evsel))
340 return -1;
341
342 evsel->handler = handler;
343 perf_evlist__add(evlist, evsel);
344 return 0;
345}
346
347static int perf_evlist__nr_threads(struct perf_evlist *evlist,
348 struct perf_evsel *evsel)
349{
350 if (evsel->system_wide)
351 return 1;
352 else
353 return thread_map__nr(evlist->threads);
354}
355
356void perf_evlist__disable(struct perf_evlist *evlist)
357{
358 struct perf_evsel *pos;
359
360 evlist__for_each_entry(evlist, pos) {
361 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
362 continue;
363 perf_evsel__disable(pos);
364 }
365
366 evlist->enabled = false;
367}
368
369void perf_evlist__enable(struct perf_evlist *evlist)
370{
371 struct perf_evsel *pos;
372
373 evlist__for_each_entry(evlist, pos) {
374 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
375 continue;
376 perf_evsel__enable(pos);
377 }
378
379 evlist->enabled = true;
380}
381
382void perf_evlist__toggle_enable(struct perf_evlist *evlist)
383{
384 (evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist);
385}
386
387static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
388 struct perf_evsel *evsel, int cpu)
389{
390 int thread;
391 int nr_threads = perf_evlist__nr_threads(evlist, evsel);
392
393 if (!evsel->fd)
394 return -EINVAL;
395
396 for (thread = 0; thread < nr_threads; thread++) {
397 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
398 if (err)
399 return err;
400 }
401 return 0;
402}
403
404static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
405 struct perf_evsel *evsel,
406 int thread)
407{
408 int cpu;
409 int nr_cpus = cpu_map__nr(evlist->cpus);
410
411 if (!evsel->fd)
412 return -EINVAL;
413
414 for (cpu = 0; cpu < nr_cpus; cpu++) {
415 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
416 if (err)
417 return err;
418 }
419 return 0;
420}
421
422int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
423 struct perf_evsel *evsel, int idx)
424{
425 bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
426
427 if (per_cpu_mmaps)
428 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
429 else
430 return perf_evlist__enable_event_thread(evlist, evsel, idx);
431}
432
433int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
434{
435 int nr_cpus = cpu_map__nr(evlist->cpus);
436 int nr_threads = thread_map__nr(evlist->threads);
437 int nfds = 0;
438 struct perf_evsel *evsel;
439
440 evlist__for_each_entry(evlist, evsel) {
441 if (evsel->system_wide)
442 nfds += nr_cpus;
443 else
444 nfds += nr_cpus * nr_threads;
445 }
446
447 if (fdarray__available_entries(&evlist->pollfd) < nfds &&
448 fdarray__grow(&evlist->pollfd, nfds) < 0)
449 return -ENOMEM;
450
451 return 0;
452}
453
454static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
455 struct perf_mmap *map, short revent)
456{
457 int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
458 /*
459 * Save the idx so that when we filter out fds POLLHUP'ed we can
460 * close the associated evlist->mmap[] entry.
461 */
462 if (pos >= 0) {
463 evlist->pollfd.priv[pos].ptr = map;
464
465 fcntl(fd, F_SETFL, O_NONBLOCK);
466 }
467
468 return pos;
469}
470
471int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
472{
473 return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
474}
475
476static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
477 void *arg __maybe_unused)
478{
479 struct perf_mmap *map = fda->priv[fd].ptr;
480
481 if (map)
482 perf_mmap__put(map);
483}
484
485int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
486{
487 return fdarray__filter(&evlist->pollfd, revents_and_mask,
488 perf_evlist__munmap_filtered, NULL);
489}
490
491int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
492{
493 return fdarray__poll(&evlist->pollfd, timeout);
494}
495
496static void perf_evlist__id_hash(struct perf_evlist *evlist,
497 struct perf_evsel *evsel,
498 int cpu, int thread, u64 id)
499{
500 int hash;
501 struct perf_sample_id *sid = SID(evsel, cpu, thread);
502
503 sid->id = id;
504 sid->evsel = evsel;
505 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
506 hlist_add_head(&sid->node, &evlist->heads[hash]);
507}
508
509void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
510 int cpu, int thread, u64 id)
511{
512 perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
513 evsel->id[evsel->ids++] = id;
514}
515
516int perf_evlist__id_add_fd(struct perf_evlist *evlist,
517 struct perf_evsel *evsel,
518 int cpu, int thread, int fd)
519{
520 u64 read_data[4] = { 0, };
521 int id_idx = 1; /* The first entry is the counter value */
522 u64 id;
523 int ret;
524
525 ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
526 if (!ret)
527 goto add;
528
529 if (errno != ENOTTY)
530 return -1;
531
532 /* Legacy way to get event id.. All hail to old kernels! */
533
534 /*
535 * This way does not work with group format read, so bail
536 * out in that case.
537 */
538 if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
539 return -1;
540
541 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
542 read(fd, &read_data, sizeof(read_data)) == -1)
543 return -1;
544
545 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
546 ++id_idx;
547 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
548 ++id_idx;
549
550 id = read_data[id_idx];
551
552 add:
553 perf_evlist__id_add(evlist, evsel, cpu, thread, id);
554 return 0;
555}
556
557static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
558 struct perf_evsel *evsel, int idx, int cpu,
559 int thread)
560{
561 struct perf_sample_id *sid = SID(evsel, cpu, thread);
562 sid->idx = idx;
563 if (evlist->cpus && cpu >= 0)
564 sid->cpu = evlist->cpus->map[cpu];
565 else
566 sid->cpu = -1;
567 if (!evsel->system_wide && evlist->threads && thread >= 0)
568 sid->tid = thread_map__pid(evlist->threads, thread);
569 else
570 sid->tid = -1;
571}
572
573struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
574{
575 struct hlist_head *head;
576 struct perf_sample_id *sid;
577 int hash;
578
579 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
580 head = &evlist->heads[hash];
581
582 hlist_for_each_entry(sid, head, node)
583 if (sid->id == id)
584 return sid;
585
586 return NULL;
587}
588
589struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
590{
591 struct perf_sample_id *sid;
592
593 if (evlist->nr_entries == 1 || !id)
594 return perf_evlist__first(evlist);
595
596 sid = perf_evlist__id2sid(evlist, id);
597 if (sid)
598 return sid->evsel;
599
600 if (!perf_evlist__sample_id_all(evlist))
601 return perf_evlist__first(evlist);
602
603 return NULL;
604}
605
606struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
607 u64 id)
608{
609 struct perf_sample_id *sid;
610
611 if (!id)
612 return NULL;
613
614 sid = perf_evlist__id2sid(evlist, id);
615 if (sid)
616 return sid->evsel;
617
618 return NULL;
619}
620
621static int perf_evlist__event2id(struct perf_evlist *evlist,
622 union perf_event *event, u64 *id)
623{
624 const u64 *array = event->sample.array;
625 ssize_t n;
626
627 n = (event->header.size - sizeof(event->header)) >> 3;
628
629 if (event->header.type == PERF_RECORD_SAMPLE) {
630 if (evlist->id_pos >= n)
631 return -1;
632 *id = array[evlist->id_pos];
633 } else {
634 if (evlist->is_pos > n)
635 return -1;
636 n -= evlist->is_pos;
637 *id = array[n];
638 }
639 return 0;
640}
641
642struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
643 union perf_event *event)
644{
645 struct perf_evsel *first = perf_evlist__first(evlist);
646 struct hlist_head *head;
647 struct perf_sample_id *sid;
648 int hash;
649 u64 id;
650
651 if (evlist->nr_entries == 1)
652 return first;
653
654 if (!first->attr.sample_id_all &&
655 event->header.type != PERF_RECORD_SAMPLE)
656 return first;
657
658 if (perf_evlist__event2id(evlist, event, &id))
659 return NULL;
660
661 /* Synthesized events have an id of zero */
662 if (!id)
663 return first;
664
665 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
666 head = &evlist->heads[hash];
667
668 hlist_for_each_entry(sid, head, node) {
669 if (sid->id == id)
670 return sid->evsel;
671 }
672 return NULL;
673}
674
675static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
676{
677 int i;
678
679 if (!evlist->overwrite_mmap)
680 return 0;
681
682 for (i = 0; i < evlist->nr_mmaps; i++) {
683 int fd = evlist->overwrite_mmap[i].fd;
684 int err;
685
686 if (fd < 0)
687 continue;
688 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
689 if (err)
690 return err;
691 }
692 return 0;
693}
694
695static int perf_evlist__pause(struct perf_evlist *evlist)
696{
697 return perf_evlist__set_paused(evlist, true);
698}
699
700static int perf_evlist__resume(struct perf_evlist *evlist)
701{
702 return perf_evlist__set_paused(evlist, false);
703}
704
705static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
706{
707 int i;
708
709 if (evlist->mmap)
710 for (i = 0; i < evlist->nr_mmaps; i++)
711 perf_mmap__munmap(&evlist->mmap[i]);
712
713 if (evlist->overwrite_mmap)
714 for (i = 0; i < evlist->nr_mmaps; i++)
715 perf_mmap__munmap(&evlist->overwrite_mmap[i]);
716}
717
718void perf_evlist__munmap(struct perf_evlist *evlist)
719{
720 perf_evlist__munmap_nofree(evlist);
721 zfree(&evlist->mmap);
722 zfree(&evlist->overwrite_mmap);
723}
724
725static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist,
726 bool overwrite)
727{
728 int i;
729 struct perf_mmap *map;
730
731 evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
732 if (cpu_map__empty(evlist->cpus))
733 evlist->nr_mmaps = thread_map__nr(evlist->threads);
734 map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
735 if (!map)
736 return NULL;
737
738 for (i = 0; i < evlist->nr_mmaps; i++) {
739 map[i].fd = -1;
740 map[i].overwrite = overwrite;
741 /*
742 * When the perf_mmap() call is made we grab one refcount, plus
743 * one extra to let perf_mmap__consume() get the last
744 * events after all real references (perf_mmap__get()) are
745 * dropped.
746 *
747 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
748 * thus does perf_mmap__get() on it.
749 */
750 refcount_set(&map[i].refcnt, 0);
751 }
752 return map;
753}
754
755static bool
756perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
757 struct perf_evsel *evsel)
758{
759 if (evsel->attr.write_backward)
760 return false;
761 return true;
762}
763
764static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
765 struct mmap_params *mp, int cpu_idx,
766 int thread, int *_output, int *_output_overwrite)
767{
768 struct perf_evsel *evsel;
769 int revent;
770 int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
771
772 evlist__for_each_entry(evlist, evsel) {
773 struct perf_mmap *maps = evlist->mmap;
774 int *output = _output;
775 int fd;
776 int cpu;
777
778 mp->prot = PROT_READ | PROT_WRITE;
779 if (evsel->attr.write_backward) {
780 output = _output_overwrite;
781 maps = evlist->overwrite_mmap;
782
783 if (!maps) {
784 maps = perf_evlist__alloc_mmap(evlist, true);
785 if (!maps)
786 return -1;
787 evlist->overwrite_mmap = maps;
788 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
789 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
790 }
791 mp->prot &= ~PROT_WRITE;
792 }
793
794 if (evsel->system_wide && thread)
795 continue;
796
797 cpu = cpu_map__idx(evsel->cpus, evlist_cpu);
798 if (cpu == -1)
799 continue;
800
801 fd = FD(evsel, cpu, thread);
802
803 if (*output == -1) {
804 *output = fd;
805
806 if (perf_mmap__mmap(&maps[idx], mp, *output) < 0)
807 return -1;
808 } else {
809 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
810 return -1;
811
812 perf_mmap__get(&maps[idx]);
813 }
814
815 revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
816
817 /*
818 * The system_wide flag causes a selected event to be opened
819 * always without a pid. Consequently it will never get a
820 * POLLHUP, but it is used for tracking in combination with
821 * other events, so it should not need to be polled anyway.
822 * Therefore don't add it for polling.
823 */
824 if (!evsel->system_wide &&
825 __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
826 perf_mmap__put(&maps[idx]);
827 return -1;
828 }
829
830 if (evsel->attr.read_format & PERF_FORMAT_ID) {
831 if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
832 fd) < 0)
833 return -1;
834 perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
835 thread);
836 }
837 }
838
839 return 0;
840}
841
842static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
843 struct mmap_params *mp)
844{
845 int cpu, thread;
846 int nr_cpus = cpu_map__nr(evlist->cpus);
847 int nr_threads = thread_map__nr(evlist->threads);
848
849 pr_debug2("perf event ring buffer mmapped per cpu\n");
850 for (cpu = 0; cpu < nr_cpus; cpu++) {
851 int output = -1;
852 int output_overwrite = -1;
853
854 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
855 true);
856
857 for (thread = 0; thread < nr_threads; thread++) {
858 if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
859 thread, &output, &output_overwrite))
860 goto out_unmap;
861 }
862 }
863
864 return 0;
865
866out_unmap:
867 perf_evlist__munmap_nofree(evlist);
868 return -1;
869}
870
871static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
872 struct mmap_params *mp)
873{
874 int thread;
875 int nr_threads = thread_map__nr(evlist->threads);
876
877 pr_debug2("perf event ring buffer mmapped per thread\n");
878 for (thread = 0; thread < nr_threads; thread++) {
879 int output = -1;
880 int output_overwrite = -1;
881
882 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
883 false);
884
885 if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
886 &output, &output_overwrite))
887 goto out_unmap;
888 }
889
890 return 0;
891
892out_unmap:
893 perf_evlist__munmap_nofree(evlist);
894 return -1;
895}
896
897unsigned long perf_event_mlock_kb_in_pages(void)
898{
899 unsigned long pages;
900 int max;
901
902 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
903 /*
904 * Pick a once upon a time good value, i.e. things look
905 * strange since we can't read a sysctl value, but lets not
906 * die yet...
907 */
908 max = 512;
909 } else {
910 max -= (page_size / 1024);
911 }
912
913 pages = (max * 1024) / page_size;
914 if (!is_power_of_2(pages))
915 pages = rounddown_pow_of_two(pages);
916
917 return pages;
918}
919
920size_t perf_evlist__mmap_size(unsigned long pages)
921{
922 if (pages == UINT_MAX)
923 pages = perf_event_mlock_kb_in_pages();
924 else if (!is_power_of_2(pages))
925 return 0;
926
927 return (pages + 1) * page_size;
928}
929
930static long parse_pages_arg(const char *str, unsigned long min,
931 unsigned long max)
932{
933 unsigned long pages, val;
934 static struct parse_tag tags[] = {
935 { .tag = 'B', .mult = 1 },
936 { .tag = 'K', .mult = 1 << 10 },
937 { .tag = 'M', .mult = 1 << 20 },
938 { .tag = 'G', .mult = 1 << 30 },
939 { .tag = 0 },
940 };
941
942 if (str == NULL)
943 return -EINVAL;
944
945 val = parse_tag_value(str, tags);
946 if (val != (unsigned long) -1) {
947 /* we got file size value */
948 pages = PERF_ALIGN(val, page_size) / page_size;
949 } else {
950 /* we got pages count value */
951 char *eptr;
952 pages = strtoul(str, &eptr, 10);
953 if (*eptr != '\0')
954 return -EINVAL;
955 }
956
957 if (pages == 0 && min == 0) {
958 /* leave number of pages at 0 */
959 } else if (!is_power_of_2(pages)) {
960 char buf[100];
961
962 /* round pages up to next power of 2 */
963 pages = roundup_pow_of_two(pages);
964 if (!pages)
965 return -EINVAL;
966
967 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
968 pr_info("rounding mmap pages size to %s (%lu pages)\n",
969 buf, pages);
970 }
971
972 if (pages > max)
973 return -EINVAL;
974
975 return pages;
976}
977
978int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
979{
980 unsigned long max = UINT_MAX;
981 long pages;
982
983 if (max > SIZE_MAX / page_size)
984 max = SIZE_MAX / page_size;
985
986 pages = parse_pages_arg(str, 1, max);
987 if (pages < 0) {
988 pr_err("Invalid argument for --mmap_pages/-m\n");
989 return -1;
990 }
991
992 *mmap_pages = pages;
993 return 0;
994}
995
996int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
997 int unset __maybe_unused)
998{
999 return __perf_evlist__parse_mmap_pages(opt->value, str);
1000}
1001
1002/**
1003 * perf_evlist__mmap_ex - Create mmaps to receive events.
1004 * @evlist: list of events
1005 * @pages: map length in pages
1006 * @overwrite: overwrite older events?
1007 * @auxtrace_pages - auxtrace map length in pages
1008 * @auxtrace_overwrite - overwrite older auxtrace data?
1009 *
1010 * If @overwrite is %false the user needs to signal event consumption using
1011 * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
1012 * automatically.
1013 *
1014 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1015 * consumption using auxtrace_mmap__write_tail().
1016 *
1017 * Return: %0 on success, negative error code otherwise.
1018 */
1019int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
1020 unsigned int auxtrace_pages,
1021 bool auxtrace_overwrite)
1022{
1023 struct perf_evsel *evsel;
1024 const struct cpu_map *cpus = evlist->cpus;
1025 const struct thread_map *threads = evlist->threads;
1026 /*
1027 * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1028 * Its value is decided by evsel's write_backward.
1029 * So &mp should not be passed through const pointer.
1030 */
1031 struct mmap_params mp;
1032
1033 if (!evlist->mmap)
1034 evlist->mmap = perf_evlist__alloc_mmap(evlist, false);
1035 if (!evlist->mmap)
1036 return -ENOMEM;
1037
1038 if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
1039 return -ENOMEM;
1040
1041 evlist->mmap_len = perf_evlist__mmap_size(pages);
1042 pr_debug("mmap size %zuB\n", evlist->mmap_len);
1043 mp.mask = evlist->mmap_len - page_size - 1;
1044
1045 auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
1046 auxtrace_pages, auxtrace_overwrite);
1047
1048 evlist__for_each_entry(evlist, evsel) {
1049 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
1050 evsel->sample_id == NULL &&
1051 perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
1052 return -ENOMEM;
1053 }
1054
1055 if (cpu_map__empty(cpus))
1056 return perf_evlist__mmap_per_thread(evlist, &mp);
1057
1058 return perf_evlist__mmap_per_cpu(evlist, &mp);
1059}
1060
1061int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
1062{
1063 return perf_evlist__mmap_ex(evlist, pages, 0, false);
1064}
1065
1066int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
1067{
1068 bool all_threads = (target->per_thread && target->system_wide);
1069 struct cpu_map *cpus;
1070 struct thread_map *threads;
1071
1072 /*
1073 * If specify '-a' and '--per-thread' to perf record, perf record
1074 * will override '--per-thread'. target->per_thread = false and
1075 * target->system_wide = true.
1076 *
1077 * If specify '--per-thread' only to perf record,
1078 * target->per_thread = true and target->system_wide = false.
1079 *
1080 * So target->per_thread && target->system_wide is false.
1081 * For perf record, thread_map__new_str doesn't call
1082 * thread_map__new_all_cpus. That will keep perf record's
1083 * current behavior.
1084 *
1085 * For perf stat, it allows the case that target->per_thread and
1086 * target->system_wide are all true. It means to collect system-wide
1087 * per-thread data. thread_map__new_str will call
1088 * thread_map__new_all_cpus to enumerate all threads.
1089 */
1090 threads = thread_map__new_str(target->pid, target->tid, target->uid,
1091 all_threads);
1092
1093 if (!threads)
1094 return -1;
1095
1096 if (target__uses_dummy_map(target))
1097 cpus = cpu_map__dummy_new();
1098 else
1099 cpus = cpu_map__new(target->cpu_list);
1100
1101 if (!cpus)
1102 goto out_delete_threads;
1103
1104 evlist->has_user_cpus = !!target->cpu_list;
1105
1106 perf_evlist__set_maps(evlist, cpus, threads);
1107
1108 return 0;
1109
1110out_delete_threads:
1111 thread_map__put(threads);
1112 return -1;
1113}
1114
1115void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
1116 struct thread_map *threads)
1117{
1118 /*
1119 * Allow for the possibility that one or another of the maps isn't being
1120 * changed i.e. don't put it. Note we are assuming the maps that are
1121 * being applied are brand new and evlist is taking ownership of the
1122 * original reference count of 1. If that is not the case it is up to
1123 * the caller to increase the reference count.
1124 */
1125 if (cpus != evlist->cpus) {
1126 cpu_map__put(evlist->cpus);
1127 evlist->cpus = cpu_map__get(cpus);
1128 }
1129
1130 if (threads != evlist->threads) {
1131 thread_map__put(evlist->threads);
1132 evlist->threads = thread_map__get(threads);
1133 }
1134
1135 perf_evlist__propagate_maps(evlist);
1136}
1137
1138void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
1139 enum perf_event_sample_format bit)
1140{
1141 struct perf_evsel *evsel;
1142
1143 evlist__for_each_entry(evlist, evsel)
1144 __perf_evsel__set_sample_bit(evsel, bit);
1145}
1146
1147void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
1148 enum perf_event_sample_format bit)
1149{
1150 struct perf_evsel *evsel;
1151
1152 evlist__for_each_entry(evlist, evsel)
1153 __perf_evsel__reset_sample_bit(evsel, bit);
1154}
1155
1156int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
1157{
1158 struct perf_evsel *evsel;
1159 int err = 0;
1160
1161 evlist__for_each_entry(evlist, evsel) {
1162 if (evsel->filter == NULL)
1163 continue;
1164
1165 /*
1166 * filters only work for tracepoint event, which doesn't have cpu limit.
1167 * So evlist and evsel should always be same.
1168 */
1169 err = perf_evsel__apply_filter(evsel, evsel->filter);
1170 if (err) {
1171 *err_evsel = evsel;
1172 break;
1173 }
1174 }
1175
1176 return err;
1177}
1178
1179int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
1180{
1181 struct perf_evsel *evsel;
1182 int err = 0;
1183
1184 evlist__for_each_entry(evlist, evsel) {
1185 if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
1186 continue;
1187
1188 err = perf_evsel__set_filter(evsel, filter);
1189 if (err)
1190 break;
1191 }
1192
1193 return err;
1194}
1195
1196int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids)
1197{
1198 char *filter;
1199 int ret = -1;
1200 size_t i;
1201
1202 for (i = 0; i < npids; ++i) {
1203 if (i == 0) {
1204 if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1205 return -1;
1206 } else {
1207 char *tmp;
1208
1209 if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1210 goto out_free;
1211
1212 free(filter);
1213 filter = tmp;
1214 }
1215 }
1216
1217 ret = perf_evlist__set_filter(evlist, filter);
1218out_free:
1219 free(filter);
1220 return ret;
1221}
1222
1223int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid)
1224{
1225 return perf_evlist__set_filter_pids(evlist, 1, &pid);
1226}
1227
1228bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
1229{
1230 struct perf_evsel *pos;
1231
1232 if (evlist->nr_entries == 1)
1233 return true;
1234
1235 if (evlist->id_pos < 0 || evlist->is_pos < 0)
1236 return false;
1237
1238 evlist__for_each_entry(evlist, pos) {
1239 if (pos->id_pos != evlist->id_pos ||
1240 pos->is_pos != evlist->is_pos)
1241 return false;
1242 }
1243
1244 return true;
1245}
1246
1247u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1248{
1249 struct perf_evsel *evsel;
1250
1251 if (evlist->combined_sample_type)
1252 return evlist->combined_sample_type;
1253
1254 evlist__for_each_entry(evlist, evsel)
1255 evlist->combined_sample_type |= evsel->attr.sample_type;
1256
1257 return evlist->combined_sample_type;
1258}
1259
1260u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1261{
1262 evlist->combined_sample_type = 0;
1263 return __perf_evlist__combined_sample_type(evlist);
1264}
1265
1266u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist)
1267{
1268 struct perf_evsel *evsel;
1269 u64 branch_type = 0;
1270
1271 evlist__for_each_entry(evlist, evsel)
1272 branch_type |= evsel->attr.branch_sample_type;
1273 return branch_type;
1274}
1275
1276bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
1277{
1278 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1279 u64 read_format = first->attr.read_format;
1280 u64 sample_type = first->attr.sample_type;
1281
1282 evlist__for_each_entry(evlist, pos) {
1283 if (read_format != pos->attr.read_format)
1284 return false;
1285 }
1286
1287 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1288 if ((sample_type & PERF_SAMPLE_READ) &&
1289 !(read_format & PERF_FORMAT_ID)) {
1290 return false;
1291 }
1292
1293 return true;
1294}
1295
1296u64 perf_evlist__read_format(struct perf_evlist *evlist)
1297{
1298 struct perf_evsel *first = perf_evlist__first(evlist);
1299 return first->attr.read_format;
1300}
1301
1302u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
1303{
1304 struct perf_evsel *first = perf_evlist__first(evlist);
1305 struct perf_sample *data;
1306 u64 sample_type;
1307 u16 size = 0;
1308
1309 if (!first->attr.sample_id_all)
1310 goto out;
1311
1312 sample_type = first->attr.sample_type;
1313
1314 if (sample_type & PERF_SAMPLE_TID)
1315 size += sizeof(data->tid) * 2;
1316
1317 if (sample_type & PERF_SAMPLE_TIME)
1318 size += sizeof(data->time);
1319
1320 if (sample_type & PERF_SAMPLE_ID)
1321 size += sizeof(data->id);
1322
1323 if (sample_type & PERF_SAMPLE_STREAM_ID)
1324 size += sizeof(data->stream_id);
1325
1326 if (sample_type & PERF_SAMPLE_CPU)
1327 size += sizeof(data->cpu) * 2;
1328
1329 if (sample_type & PERF_SAMPLE_IDENTIFIER)
1330 size += sizeof(data->id);
1331out:
1332 return size;
1333}
1334
1335bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
1336{
1337 struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1338
1339 evlist__for_each_entry_continue(evlist, pos) {
1340 if (first->attr.sample_id_all != pos->attr.sample_id_all)
1341 return false;
1342 }
1343
1344 return true;
1345}
1346
1347bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
1348{
1349 struct perf_evsel *first = perf_evlist__first(evlist);
1350 return first->attr.sample_id_all;
1351}
1352
1353void perf_evlist__set_selected(struct perf_evlist *evlist,
1354 struct perf_evsel *evsel)
1355{
1356 evlist->selected = evsel;
1357}
1358
1359void perf_evlist__close(struct perf_evlist *evlist)
1360{
1361 struct perf_evsel *evsel;
1362
1363 evlist__for_each_entry_reverse(evlist, evsel)
1364 perf_evsel__close(evsel);
1365}
1366
1367static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
1368{
1369 struct cpu_map *cpus;
1370 struct thread_map *threads;
1371 int err = -ENOMEM;
1372
1373 /*
1374 * Try reading /sys/devices/system/cpu/online to get
1375 * an all cpus map.
1376 *
1377 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1378 * code needs an overhaul to properly forward the
1379 * error, and we may not want to do that fallback to a
1380 * default cpu identity map :-\
1381 */
1382 cpus = cpu_map__new(NULL);
1383 if (!cpus)
1384 goto out;
1385
1386 threads = thread_map__new_dummy();
1387 if (!threads)
1388 goto out_put;
1389
1390 perf_evlist__set_maps(evlist, cpus, threads);
1391out:
1392 return err;
1393out_put:
1394 cpu_map__put(cpus);
1395 goto out;
1396}
1397
1398int perf_evlist__open(struct perf_evlist *evlist)
1399{
1400 struct perf_evsel *evsel;
1401 int err;
1402
1403 /*
1404 * Default: one fd per CPU, all threads, aka systemwide
1405 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1406 */
1407 if (evlist->threads == NULL && evlist->cpus == NULL) {
1408 err = perf_evlist__create_syswide_maps(evlist);
1409 if (err < 0)
1410 goto out_err;
1411 }
1412
1413 perf_evlist__update_id_pos(evlist);
1414
1415 evlist__for_each_entry(evlist, evsel) {
1416 err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
1417 if (err < 0)
1418 goto out_err;
1419 }
1420
1421 return 0;
1422out_err:
1423 perf_evlist__close(evlist);
1424 errno = -err;
1425 return err;
1426}
1427
1428int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1429 const char *argv[], bool pipe_output,
1430 void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1431{
1432 int child_ready_pipe[2], go_pipe[2];
1433 char bf;
1434
1435 if (pipe(child_ready_pipe) < 0) {
1436 perror("failed to create 'ready' pipe");
1437 return -1;
1438 }
1439
1440 if (pipe(go_pipe) < 0) {
1441 perror("failed to create 'go' pipe");
1442 goto out_close_ready_pipe;
1443 }
1444
1445 evlist->workload.pid = fork();
1446 if (evlist->workload.pid < 0) {
1447 perror("failed to fork");
1448 goto out_close_pipes;
1449 }
1450
1451 if (!evlist->workload.pid) {
1452 int ret;
1453
1454 if (pipe_output)
1455 dup2(2, 1);
1456
1457 signal(SIGTERM, SIG_DFL);
1458
1459 close(child_ready_pipe[0]);
1460 close(go_pipe[1]);
1461 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1462
1463 /*
1464 * Tell the parent we're ready to go
1465 */
1466 close(child_ready_pipe[1]);
1467
1468 /*
1469 * Wait until the parent tells us to go.
1470 */
1471 ret = read(go_pipe[0], &bf, 1);
1472 /*
1473 * The parent will ask for the execvp() to be performed by
1474 * writing exactly one byte, in workload.cork_fd, usually via
1475 * perf_evlist__start_workload().
1476 *
1477 * For cancelling the workload without actually running it,
1478 * the parent will just close workload.cork_fd, without writing
1479 * anything, i.e. read will return zero and we just exit()
1480 * here.
1481 */
1482 if (ret != 1) {
1483 if (ret == -1)
1484 perror("unable to read pipe");
1485 exit(ret);
1486 }
1487
1488 execvp(argv[0], (char **)argv);
1489
1490 if (exec_error) {
1491 union sigval val;
1492
1493 val.sival_int = errno;
1494 if (sigqueue(getppid(), SIGUSR1, val))
1495 perror(argv[0]);
1496 } else
1497 perror(argv[0]);
1498 exit(-1);
1499 }
1500
1501 if (exec_error) {
1502 struct sigaction act = {
1503 .sa_flags = SA_SIGINFO,
1504 .sa_sigaction = exec_error,
1505 };
1506 sigaction(SIGUSR1, &act, NULL);
1507 }
1508
1509 if (target__none(target)) {
1510 if (evlist->threads == NULL) {
1511 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1512 __func__, __LINE__);
1513 goto out_close_pipes;
1514 }
1515 thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
1516 }
1517
1518 close(child_ready_pipe[1]);
1519 close(go_pipe[0]);
1520 /*
1521 * wait for child to settle
1522 */
1523 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1524 perror("unable to read pipe");
1525 goto out_close_pipes;
1526 }
1527
1528 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1529 evlist->workload.cork_fd = go_pipe[1];
1530 close(child_ready_pipe[0]);
1531 return 0;
1532
1533out_close_pipes:
1534 close(go_pipe[0]);
1535 close(go_pipe[1]);
1536out_close_ready_pipe:
1537 close(child_ready_pipe[0]);
1538 close(child_ready_pipe[1]);
1539 return -1;
1540}
1541
1542int perf_evlist__start_workload(struct perf_evlist *evlist)
1543{
1544 if (evlist->workload.cork_fd > 0) {
1545 char bf = 0;
1546 int ret;
1547 /*
1548 * Remove the cork, let it rip!
1549 */
1550 ret = write(evlist->workload.cork_fd, &bf, 1);
1551 if (ret < 0)
1552 perror("unable to write to pipe");
1553
1554 close(evlist->workload.cork_fd);
1555 return ret;
1556 }
1557
1558 return 0;
1559}
1560
1561int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1562 struct perf_sample *sample)
1563{
1564 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1565
1566 if (!evsel)
1567 return -EFAULT;
1568 return perf_evsel__parse_sample(evsel, event, sample);
1569}
1570
1571int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
1572 union perf_event *event,
1573 u64 *timestamp)
1574{
1575 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1576
1577 if (!evsel)
1578 return -EFAULT;
1579 return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1580}
1581
1582size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1583{
1584 struct perf_evsel *evsel;
1585 size_t printed = 0;
1586
1587 evlist__for_each_entry(evlist, evsel) {
1588 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1589 perf_evsel__name(evsel));
1590 }
1591
1592 return printed + fprintf(fp, "\n");
1593}
1594
1595int perf_evlist__strerror_open(struct perf_evlist *evlist,
1596 int err, char *buf, size_t size)
1597{
1598 int printed, value;
1599 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1600
1601 switch (err) {
1602 case EACCES:
1603 case EPERM:
1604 printed = scnprintf(buf, size,
1605 "Error:\t%s.\n"
1606 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1607
1608 value = perf_event_paranoid();
1609
1610 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1611
1612 if (value >= 2) {
1613 printed += scnprintf(buf + printed, size - printed,
1614 "For your workloads it needs to be <= 1\nHint:\t");
1615 }
1616 printed += scnprintf(buf + printed, size - printed,
1617 "For system wide tracing it needs to be set to -1.\n");
1618
1619 printed += scnprintf(buf + printed, size - printed,
1620 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1621 "Hint:\tThe current value is %d.", value);
1622 break;
1623 case EINVAL: {
1624 struct perf_evsel *first = perf_evlist__first(evlist);
1625 int max_freq;
1626
1627 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1628 goto out_default;
1629
1630 if (first->attr.sample_freq < (u64)max_freq)
1631 goto out_default;
1632
1633 printed = scnprintf(buf, size,
1634 "Error:\t%s.\n"
1635 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1636 "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1637 emsg, max_freq, first->attr.sample_freq);
1638 break;
1639 }
1640 default:
1641out_default:
1642 scnprintf(buf, size, "%s", emsg);
1643 break;
1644 }
1645
1646 return 0;
1647}
1648
1649int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
1650{
1651 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1652 int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
1653
1654 switch (err) {
1655 case EPERM:
1656 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1657 printed += scnprintf(buf + printed, size - printed,
1658 "Error:\t%s.\n"
1659 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1660 "Hint:\tTried using %zd kB.\n",
1661 emsg, pages_max_per_user, pages_attempted);
1662
1663 if (pages_attempted >= pages_max_per_user) {
1664 printed += scnprintf(buf + printed, size - printed,
1665 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1666 pages_max_per_user + pages_attempted);
1667 }
1668
1669 printed += scnprintf(buf + printed, size - printed,
1670 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1671 break;
1672 default:
1673 scnprintf(buf, size, "%s", emsg);
1674 break;
1675 }
1676
1677 return 0;
1678}
1679
1680void perf_evlist__to_front(struct perf_evlist *evlist,
1681 struct perf_evsel *move_evsel)
1682{
1683 struct perf_evsel *evsel, *n;
1684 LIST_HEAD(move);
1685
1686 if (move_evsel == perf_evlist__first(evlist))
1687 return;
1688
1689 evlist__for_each_entry_safe(evlist, n, evsel) {
1690 if (evsel->leader == move_evsel->leader)
1691 list_move_tail(&evsel->node, &move);
1692 }
1693
1694 list_splice(&move, &evlist->entries);
1695}
1696
1697void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
1698 struct perf_evsel *tracking_evsel)
1699{
1700 struct perf_evsel *evsel;
1701
1702 if (tracking_evsel->tracking)
1703 return;
1704
1705 evlist__for_each_entry(evlist, evsel) {
1706 if (evsel != tracking_evsel)
1707 evsel->tracking = false;
1708 }
1709
1710 tracking_evsel->tracking = true;
1711}
1712
1713struct perf_evsel *
1714perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
1715 const char *str)
1716{
1717 struct perf_evsel *evsel;
1718
1719 evlist__for_each_entry(evlist, evsel) {
1720 if (!evsel->name)
1721 continue;
1722 if (strcmp(str, evsel->name) == 0)
1723 return evsel;
1724 }
1725
1726 return NULL;
1727}
1728
1729void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist,
1730 enum bkw_mmap_state state)
1731{
1732 enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1733 enum action {
1734 NONE,
1735 PAUSE,
1736 RESUME,
1737 } action = NONE;
1738
1739 if (!evlist->overwrite_mmap)
1740 return;
1741
1742 switch (old_state) {
1743 case BKW_MMAP_NOTREADY: {
1744 if (state != BKW_MMAP_RUNNING)
1745 goto state_err;
1746 break;
1747 }
1748 case BKW_MMAP_RUNNING: {
1749 if (state != BKW_MMAP_DATA_PENDING)
1750 goto state_err;
1751 action = PAUSE;
1752 break;
1753 }
1754 case BKW_MMAP_DATA_PENDING: {
1755 if (state != BKW_MMAP_EMPTY)
1756 goto state_err;
1757 break;
1758 }
1759 case BKW_MMAP_EMPTY: {
1760 if (state != BKW_MMAP_RUNNING)
1761 goto state_err;
1762 action = RESUME;
1763 break;
1764 }
1765 default:
1766 WARN_ONCE(1, "Shouldn't get there\n");
1767 }
1768
1769 evlist->bkw_mmap_state = state;
1770
1771 switch (action) {
1772 case PAUSE:
1773 perf_evlist__pause(evlist);
1774 break;
1775 case RESUME:
1776 perf_evlist__resume(evlist);
1777 break;
1778 case NONE:
1779 default:
1780 break;
1781 }
1782
1783state_err:
1784 return;
1785}
1786
1787bool perf_evlist__exclude_kernel(struct perf_evlist *evlist)
1788{
1789 struct perf_evsel *evsel;
1790
1791 evlist__for_each_entry(evlist, evsel) {
1792 if (!evsel->attr.exclude_kernel)
1793 return false;
1794 }
1795
1796 return true;
1797}
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 "debug.h"
19#include "units.h"
20#include <internal/lib.h> // page_size
21#include "../perf.h"
22#include "asm/bug.h"
23#include "bpf-event.h"
24#include <signal.h>
25#include <unistd.h>
26#include <sched.h>
27#include <stdlib.h>
28
29#include "parse-events.h"
30#include <subcmd/parse-options.h>
31
32#include <fcntl.h>
33#include <sys/ioctl.h>
34#include <sys/mman.h>
35
36#include <linux/bitops.h>
37#include <linux/hash.h>
38#include <linux/log2.h>
39#include <linux/err.h>
40#include <linux/string.h>
41#include <linux/zalloc.h>
42#include <perf/evlist.h>
43#include <perf/evsel.h>
44#include <perf/cpumap.h>
45
46#include <internal/xyarray.h>
47
48#ifdef LACKS_SIGQUEUE_PROTOTYPE
49int sigqueue(pid_t pid, int sig, const union sigval value);
50#endif
51
52#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
53#define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
54
55void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
56 struct perf_thread_map *threads)
57{
58 perf_evlist__init(&evlist->core);
59 perf_evlist__set_maps(&evlist->core, cpus, threads);
60 fdarray__init(&evlist->core.pollfd, 64);
61 evlist->workload.pid = -1;
62 evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
63}
64
65struct evlist *evlist__new(void)
66{
67 struct evlist *evlist = zalloc(sizeof(*evlist));
68
69 if (evlist != NULL)
70 evlist__init(evlist, NULL, NULL);
71
72 return evlist;
73}
74
75struct evlist *perf_evlist__new_default(void)
76{
77 struct evlist *evlist = evlist__new();
78
79 if (evlist && perf_evlist__add_default(evlist)) {
80 evlist__delete(evlist);
81 evlist = NULL;
82 }
83
84 return evlist;
85}
86
87struct evlist *perf_evlist__new_dummy(void)
88{
89 struct evlist *evlist = evlist__new();
90
91 if (evlist && perf_evlist__add_dummy(evlist)) {
92 evlist__delete(evlist);
93 evlist = NULL;
94 }
95
96 return evlist;
97}
98
99/**
100 * perf_evlist__set_id_pos - set the positions of event ids.
101 * @evlist: selected event list
102 *
103 * Events with compatible sample types all have the same id_pos
104 * and is_pos. For convenience, put a copy on evlist.
105 */
106void perf_evlist__set_id_pos(struct evlist *evlist)
107{
108 struct evsel *first = evlist__first(evlist);
109
110 evlist->id_pos = first->id_pos;
111 evlist->is_pos = first->is_pos;
112}
113
114static void perf_evlist__update_id_pos(struct evlist *evlist)
115{
116 struct evsel *evsel;
117
118 evlist__for_each_entry(evlist, evsel)
119 perf_evsel__calc_id_pos(evsel);
120
121 perf_evlist__set_id_pos(evlist);
122}
123
124static void evlist__purge(struct evlist *evlist)
125{
126 struct evsel *pos, *n;
127
128 evlist__for_each_entry_safe(evlist, n, pos) {
129 list_del_init(&pos->core.node);
130 pos->evlist = NULL;
131 evsel__delete(pos);
132 }
133
134 evlist->core.nr_entries = 0;
135}
136
137void evlist__exit(struct evlist *evlist)
138{
139 zfree(&evlist->mmap);
140 zfree(&evlist->overwrite_mmap);
141 fdarray__exit(&evlist->core.pollfd);
142}
143
144void evlist__delete(struct evlist *evlist)
145{
146 if (evlist == NULL)
147 return;
148
149 evlist__munmap(evlist);
150 evlist__close(evlist);
151 perf_cpu_map__put(evlist->core.cpus);
152 perf_thread_map__put(evlist->core.threads);
153 evlist->core.cpus = NULL;
154 evlist->core.threads = NULL;
155 evlist__purge(evlist);
156 evlist__exit(evlist);
157 free(evlist);
158}
159
160void evlist__add(struct evlist *evlist, struct evsel *entry)
161{
162 entry->evlist = evlist;
163 entry->idx = evlist->core.nr_entries;
164 entry->tracking = !entry->idx;
165
166 perf_evlist__add(&evlist->core, &entry->core);
167
168 if (evlist->core.nr_entries == 1)
169 perf_evlist__set_id_pos(evlist);
170}
171
172void evlist__remove(struct evlist *evlist, struct evsel *evsel)
173{
174 evsel->evlist = NULL;
175 perf_evlist__remove(&evlist->core, &evsel->core);
176}
177
178void perf_evlist__splice_list_tail(struct evlist *evlist,
179 struct list_head *list)
180{
181 struct evsel *evsel, *temp;
182
183 __evlist__for_each_entry_safe(list, temp, evsel) {
184 list_del_init(&evsel->core.node);
185 evlist__add(evlist, evsel);
186 }
187}
188
189void __perf_evlist__set_leader(struct list_head *list)
190{
191 struct evsel *evsel, *leader;
192
193 leader = list_entry(list->next, struct evsel, core.node);
194 evsel = list_entry(list->prev, struct evsel, core.node);
195
196 leader->core.nr_members = evsel->idx - leader->idx + 1;
197
198 __evlist__for_each_entry(list, evsel) {
199 evsel->leader = leader;
200 }
201}
202
203void perf_evlist__set_leader(struct evlist *evlist)
204{
205 if (evlist->core.nr_entries) {
206 evlist->nr_groups = evlist->core.nr_entries > 1 ? 1 : 0;
207 __perf_evlist__set_leader(&evlist->core.entries);
208 }
209}
210
211int __perf_evlist__add_default(struct evlist *evlist, bool precise)
212{
213 struct evsel *evsel = perf_evsel__new_cycles(precise);
214
215 if (evsel == NULL)
216 return -ENOMEM;
217
218 evlist__add(evlist, evsel);
219 return 0;
220}
221
222int perf_evlist__add_dummy(struct evlist *evlist)
223{
224 struct perf_event_attr attr = {
225 .type = PERF_TYPE_SOFTWARE,
226 .config = PERF_COUNT_SW_DUMMY,
227 .size = sizeof(attr), /* to capture ABI version */
228 };
229 struct evsel *evsel = perf_evsel__new_idx(&attr, evlist->core.nr_entries);
230
231 if (evsel == NULL)
232 return -ENOMEM;
233
234 evlist__add(evlist, evsel);
235 return 0;
236}
237
238static int evlist__add_attrs(struct evlist *evlist,
239 struct perf_event_attr *attrs, size_t nr_attrs)
240{
241 struct evsel *evsel, *n;
242 LIST_HEAD(head);
243 size_t i;
244
245 for (i = 0; i < nr_attrs; i++) {
246 evsel = perf_evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
247 if (evsel == NULL)
248 goto out_delete_partial_list;
249 list_add_tail(&evsel->core.node, &head);
250 }
251
252 perf_evlist__splice_list_tail(evlist, &head);
253
254 return 0;
255
256out_delete_partial_list:
257 __evlist__for_each_entry_safe(&head, n, evsel)
258 evsel__delete(evsel);
259 return -1;
260}
261
262int __perf_evlist__add_default_attrs(struct evlist *evlist,
263 struct perf_event_attr *attrs, size_t nr_attrs)
264{
265 size_t i;
266
267 for (i = 0; i < nr_attrs; i++)
268 event_attr_init(attrs + i);
269
270 return evlist__add_attrs(evlist, attrs, nr_attrs);
271}
272
273struct evsel *
274perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
275{
276 struct evsel *evsel;
277
278 evlist__for_each_entry(evlist, evsel) {
279 if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
280 (int)evsel->core.attr.config == id)
281 return evsel;
282 }
283
284 return NULL;
285}
286
287struct evsel *
288perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
289 const char *name)
290{
291 struct evsel *evsel;
292
293 evlist__for_each_entry(evlist, evsel) {
294 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
295 (strcmp(evsel->name, name) == 0))
296 return evsel;
297 }
298
299 return NULL;
300}
301
302int perf_evlist__add_newtp(struct evlist *evlist,
303 const char *sys, const char *name, void *handler)
304{
305 struct evsel *evsel = perf_evsel__newtp(sys, name);
306
307 if (IS_ERR(evsel))
308 return -1;
309
310 evsel->handler = handler;
311 evlist__add(evlist, evsel);
312 return 0;
313}
314
315static int perf_evlist__nr_threads(struct evlist *evlist,
316 struct evsel *evsel)
317{
318 if (evsel->core.system_wide)
319 return 1;
320 else
321 return perf_thread_map__nr(evlist->core.threads);
322}
323
324void evlist__disable(struct evlist *evlist)
325{
326 struct evsel *pos;
327
328 evlist__for_each_entry(evlist, pos) {
329 if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->core.fd)
330 continue;
331 evsel__disable(pos);
332 }
333
334 evlist->enabled = false;
335}
336
337void evlist__enable(struct evlist *evlist)
338{
339 struct evsel *pos;
340
341 evlist__for_each_entry(evlist, pos) {
342 if (!perf_evsel__is_group_leader(pos) || !pos->core.fd)
343 continue;
344 evsel__enable(pos);
345 }
346
347 evlist->enabled = true;
348}
349
350void perf_evlist__toggle_enable(struct evlist *evlist)
351{
352 (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
353}
354
355static int perf_evlist__enable_event_cpu(struct evlist *evlist,
356 struct evsel *evsel, int cpu)
357{
358 int thread;
359 int nr_threads = perf_evlist__nr_threads(evlist, evsel);
360
361 if (!evsel->core.fd)
362 return -EINVAL;
363
364 for (thread = 0; thread < nr_threads; thread++) {
365 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
366 if (err)
367 return err;
368 }
369 return 0;
370}
371
372static int perf_evlist__enable_event_thread(struct evlist *evlist,
373 struct evsel *evsel,
374 int thread)
375{
376 int cpu;
377 int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
378
379 if (!evsel->core.fd)
380 return -EINVAL;
381
382 for (cpu = 0; cpu < nr_cpus; cpu++) {
383 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
384 if (err)
385 return err;
386 }
387 return 0;
388}
389
390int perf_evlist__enable_event_idx(struct evlist *evlist,
391 struct evsel *evsel, int idx)
392{
393 bool per_cpu_mmaps = !perf_cpu_map__empty(evlist->core.cpus);
394
395 if (per_cpu_mmaps)
396 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
397 else
398 return perf_evlist__enable_event_thread(evlist, evsel, idx);
399}
400
401int evlist__add_pollfd(struct evlist *evlist, int fd)
402{
403 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN);
404}
405
406static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
407 void *arg __maybe_unused)
408{
409 struct mmap *map = fda->priv[fd].ptr;
410
411 if (map)
412 perf_mmap__put(map);
413}
414
415int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
416{
417 return fdarray__filter(&evlist->core.pollfd, revents_and_mask,
418 perf_evlist__munmap_filtered, NULL);
419}
420
421int evlist__poll(struct evlist *evlist, int timeout)
422{
423 return perf_evlist__poll(&evlist->core, timeout);
424}
425
426static void perf_evlist__set_sid_idx(struct evlist *evlist,
427 struct evsel *evsel, int idx, int cpu,
428 int thread)
429{
430 struct perf_sample_id *sid = SID(evsel, cpu, thread);
431 sid->idx = idx;
432 if (evlist->core.cpus && cpu >= 0)
433 sid->cpu = evlist->core.cpus->map[cpu];
434 else
435 sid->cpu = -1;
436 if (!evsel->core.system_wide && evlist->core.threads && thread >= 0)
437 sid->tid = perf_thread_map__pid(evlist->core.threads, thread);
438 else
439 sid->tid = -1;
440}
441
442struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id)
443{
444 struct hlist_head *head;
445 struct perf_sample_id *sid;
446 int hash;
447
448 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
449 head = &evlist->core.heads[hash];
450
451 hlist_for_each_entry(sid, head, node)
452 if (sid->id == id)
453 return sid;
454
455 return NULL;
456}
457
458struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
459{
460 struct perf_sample_id *sid;
461
462 if (evlist->core.nr_entries == 1 || !id)
463 return evlist__first(evlist);
464
465 sid = perf_evlist__id2sid(evlist, id);
466 if (sid)
467 return container_of(sid->evsel, struct evsel, core);
468
469 if (!perf_evlist__sample_id_all(evlist))
470 return evlist__first(evlist);
471
472 return NULL;
473}
474
475struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
476 u64 id)
477{
478 struct perf_sample_id *sid;
479
480 if (!id)
481 return NULL;
482
483 sid = perf_evlist__id2sid(evlist, id);
484 if (sid)
485 return container_of(sid->evsel, struct evsel, core);
486
487 return NULL;
488}
489
490static int perf_evlist__event2id(struct evlist *evlist,
491 union perf_event *event, u64 *id)
492{
493 const __u64 *array = event->sample.array;
494 ssize_t n;
495
496 n = (event->header.size - sizeof(event->header)) >> 3;
497
498 if (event->header.type == PERF_RECORD_SAMPLE) {
499 if (evlist->id_pos >= n)
500 return -1;
501 *id = array[evlist->id_pos];
502 } else {
503 if (evlist->is_pos > n)
504 return -1;
505 n -= evlist->is_pos;
506 *id = array[n];
507 }
508 return 0;
509}
510
511struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
512 union perf_event *event)
513{
514 struct evsel *first = evlist__first(evlist);
515 struct hlist_head *head;
516 struct perf_sample_id *sid;
517 int hash;
518 u64 id;
519
520 if (evlist->core.nr_entries == 1)
521 return first;
522
523 if (!first->core.attr.sample_id_all &&
524 event->header.type != PERF_RECORD_SAMPLE)
525 return first;
526
527 if (perf_evlist__event2id(evlist, event, &id))
528 return NULL;
529
530 /* Synthesized events have an id of zero */
531 if (!id)
532 return first;
533
534 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
535 head = &evlist->core.heads[hash];
536
537 hlist_for_each_entry(sid, head, node) {
538 if (sid->id == id)
539 return container_of(sid->evsel, struct evsel, core);
540 }
541 return NULL;
542}
543
544static int perf_evlist__set_paused(struct evlist *evlist, bool value)
545{
546 int i;
547
548 if (!evlist->overwrite_mmap)
549 return 0;
550
551 for (i = 0; i < evlist->core.nr_mmaps; i++) {
552 int fd = evlist->overwrite_mmap[i].core.fd;
553 int err;
554
555 if (fd < 0)
556 continue;
557 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
558 if (err)
559 return err;
560 }
561 return 0;
562}
563
564static int perf_evlist__pause(struct evlist *evlist)
565{
566 return perf_evlist__set_paused(evlist, true);
567}
568
569static int perf_evlist__resume(struct evlist *evlist)
570{
571 return perf_evlist__set_paused(evlist, false);
572}
573
574static void evlist__munmap_nofree(struct evlist *evlist)
575{
576 int i;
577
578 if (evlist->mmap)
579 for (i = 0; i < evlist->core.nr_mmaps; i++)
580 perf_mmap__munmap(&evlist->mmap[i]);
581
582 if (evlist->overwrite_mmap)
583 for (i = 0; i < evlist->core.nr_mmaps; i++)
584 perf_mmap__munmap(&evlist->overwrite_mmap[i]);
585}
586
587void evlist__munmap(struct evlist *evlist)
588{
589 evlist__munmap_nofree(evlist);
590 zfree(&evlist->mmap);
591 zfree(&evlist->overwrite_mmap);
592}
593
594static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
595 bool overwrite)
596{
597 int i;
598 struct mmap *map;
599
600 evlist->core.nr_mmaps = perf_cpu_map__nr(evlist->core.cpus);
601 if (perf_cpu_map__empty(evlist->core.cpus))
602 evlist->core.nr_mmaps = perf_thread_map__nr(evlist->core.threads);
603 map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
604 if (!map)
605 return NULL;
606
607 for (i = 0; i < evlist->core.nr_mmaps; i++) {
608 map[i].core.fd = -1;
609 map[i].core.overwrite = overwrite;
610 /*
611 * When the perf_mmap() call is made we grab one refcount, plus
612 * one extra to let perf_mmap__consume() get the last
613 * events after all real references (perf_mmap__get()) are
614 * dropped.
615 *
616 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
617 * thus does perf_mmap__get() on it.
618 */
619 refcount_set(&map[i].core.refcnt, 0);
620 }
621 return map;
622}
623
624static bool
625perf_evlist__should_poll(struct evlist *evlist __maybe_unused,
626 struct evsel *evsel)
627{
628 if (evsel->core.attr.write_backward)
629 return false;
630 return true;
631}
632
633static int evlist__mmap_per_evsel(struct evlist *evlist, int idx,
634 struct mmap_params *mp, int cpu_idx,
635 int thread, int *_output, int *_output_overwrite)
636{
637 struct evsel *evsel;
638 int revent;
639 int evlist_cpu = cpu_map__cpu(evlist->core.cpus, cpu_idx);
640
641 evlist__for_each_entry(evlist, evsel) {
642 struct mmap *maps = evlist->mmap;
643 int *output = _output;
644 int fd;
645 int cpu;
646
647 mp->prot = PROT_READ | PROT_WRITE;
648 if (evsel->core.attr.write_backward) {
649 output = _output_overwrite;
650 maps = evlist->overwrite_mmap;
651
652 if (!maps) {
653 maps = evlist__alloc_mmap(evlist, true);
654 if (!maps)
655 return -1;
656 evlist->overwrite_mmap = maps;
657 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
658 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
659 }
660 mp->prot &= ~PROT_WRITE;
661 }
662
663 if (evsel->core.system_wide && thread)
664 continue;
665
666 cpu = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
667 if (cpu == -1)
668 continue;
669
670 fd = FD(evsel, cpu, thread);
671
672 if (*output == -1) {
673 *output = fd;
674
675 if (perf_mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
676 return -1;
677 } else {
678 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
679 return -1;
680
681 perf_mmap__get(&maps[idx]);
682 }
683
684 revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
685
686 /*
687 * The system_wide flag causes a selected event to be opened
688 * always without a pid. Consequently it will never get a
689 * POLLHUP, but it is used for tracking in combination with
690 * other events, so it should not need to be polled anyway.
691 * Therefore don't add it for polling.
692 */
693 if (!evsel->core.system_wide &&
694 perf_evlist__add_pollfd(&evlist->core, fd, &maps[idx], revent) < 0) {
695 perf_mmap__put(&maps[idx]);
696 return -1;
697 }
698
699 if (evsel->core.attr.read_format & PERF_FORMAT_ID) {
700 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, cpu, thread,
701 fd) < 0)
702 return -1;
703 perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
704 thread);
705 }
706 }
707
708 return 0;
709}
710
711static int evlist__mmap_per_cpu(struct evlist *evlist,
712 struct mmap_params *mp)
713{
714 int cpu, thread;
715 int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
716 int nr_threads = perf_thread_map__nr(evlist->core.threads);
717
718 pr_debug2("perf event ring buffer mmapped per cpu\n");
719 for (cpu = 0; cpu < nr_cpus; cpu++) {
720 int output = -1;
721 int output_overwrite = -1;
722
723 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
724 true);
725
726 for (thread = 0; thread < nr_threads; thread++) {
727 if (evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
728 thread, &output, &output_overwrite))
729 goto out_unmap;
730 }
731 }
732
733 return 0;
734
735out_unmap:
736 evlist__munmap_nofree(evlist);
737 return -1;
738}
739
740static int evlist__mmap_per_thread(struct evlist *evlist,
741 struct mmap_params *mp)
742{
743 int thread;
744 int nr_threads = perf_thread_map__nr(evlist->core.threads);
745
746 pr_debug2("perf event ring buffer mmapped per thread\n");
747 for (thread = 0; thread < nr_threads; thread++) {
748 int output = -1;
749 int output_overwrite = -1;
750
751 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
752 false);
753
754 if (evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
755 &output, &output_overwrite))
756 goto out_unmap;
757 }
758
759 return 0;
760
761out_unmap:
762 evlist__munmap_nofree(evlist);
763 return -1;
764}
765
766unsigned long perf_event_mlock_kb_in_pages(void)
767{
768 unsigned long pages;
769 int max;
770
771 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
772 /*
773 * Pick a once upon a time good value, i.e. things look
774 * strange since we can't read a sysctl value, but lets not
775 * die yet...
776 */
777 max = 512;
778 } else {
779 max -= (page_size / 1024);
780 }
781
782 pages = (max * 1024) / page_size;
783 if (!is_power_of_2(pages))
784 pages = rounddown_pow_of_two(pages);
785
786 return pages;
787}
788
789size_t evlist__mmap_size(unsigned long pages)
790{
791 if (pages == UINT_MAX)
792 pages = perf_event_mlock_kb_in_pages();
793 else if (!is_power_of_2(pages))
794 return 0;
795
796 return (pages + 1) * page_size;
797}
798
799static long parse_pages_arg(const char *str, unsigned long min,
800 unsigned long max)
801{
802 unsigned long pages, val;
803 static struct parse_tag tags[] = {
804 { .tag = 'B', .mult = 1 },
805 { .tag = 'K', .mult = 1 << 10 },
806 { .tag = 'M', .mult = 1 << 20 },
807 { .tag = 'G', .mult = 1 << 30 },
808 { .tag = 0 },
809 };
810
811 if (str == NULL)
812 return -EINVAL;
813
814 val = parse_tag_value(str, tags);
815 if (val != (unsigned long) -1) {
816 /* we got file size value */
817 pages = PERF_ALIGN(val, page_size) / page_size;
818 } else {
819 /* we got pages count value */
820 char *eptr;
821 pages = strtoul(str, &eptr, 10);
822 if (*eptr != '\0')
823 return -EINVAL;
824 }
825
826 if (pages == 0 && min == 0) {
827 /* leave number of pages at 0 */
828 } else if (!is_power_of_2(pages)) {
829 char buf[100];
830
831 /* round pages up to next power of 2 */
832 pages = roundup_pow_of_two(pages);
833 if (!pages)
834 return -EINVAL;
835
836 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
837 pr_info("rounding mmap pages size to %s (%lu pages)\n",
838 buf, pages);
839 }
840
841 if (pages > max)
842 return -EINVAL;
843
844 return pages;
845}
846
847int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
848{
849 unsigned long max = UINT_MAX;
850 long pages;
851
852 if (max > SIZE_MAX / page_size)
853 max = SIZE_MAX / page_size;
854
855 pages = parse_pages_arg(str, 1, max);
856 if (pages < 0) {
857 pr_err("Invalid argument for --mmap_pages/-m\n");
858 return -1;
859 }
860
861 *mmap_pages = pages;
862 return 0;
863}
864
865int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
866 int unset __maybe_unused)
867{
868 return __perf_evlist__parse_mmap_pages(opt->value, str);
869}
870
871/**
872 * evlist__mmap_ex - Create mmaps to receive events.
873 * @evlist: list of events
874 * @pages: map length in pages
875 * @overwrite: overwrite older events?
876 * @auxtrace_pages - auxtrace map length in pages
877 * @auxtrace_overwrite - overwrite older auxtrace data?
878 *
879 * If @overwrite is %false the user needs to signal event consumption using
880 * perf_mmap__write_tail(). Using evlist__mmap_read() does this
881 * automatically.
882 *
883 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
884 * consumption using auxtrace_mmap__write_tail().
885 *
886 * Return: %0 on success, negative error code otherwise.
887 */
888int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
889 unsigned int auxtrace_pages,
890 bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
891 int comp_level)
892{
893 struct evsel *evsel;
894 const struct perf_cpu_map *cpus = evlist->core.cpus;
895 const struct perf_thread_map *threads = evlist->core.threads;
896 /*
897 * Delay setting mp.prot: set it before calling perf_mmap__mmap.
898 * Its value is decided by evsel's write_backward.
899 * So &mp should not be passed through const pointer.
900 */
901 struct mmap_params mp = { .nr_cblocks = nr_cblocks, .affinity = affinity, .flush = flush,
902 .comp_level = comp_level };
903
904 if (!evlist->mmap)
905 evlist->mmap = evlist__alloc_mmap(evlist, false);
906 if (!evlist->mmap)
907 return -ENOMEM;
908
909 if (evlist->core.pollfd.entries == NULL && perf_evlist__alloc_pollfd(&evlist->core) < 0)
910 return -ENOMEM;
911
912 evlist->core.mmap_len = evlist__mmap_size(pages);
913 pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
914 mp.mask = evlist->core.mmap_len - page_size - 1;
915
916 auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
917 auxtrace_pages, auxtrace_overwrite);
918
919 evlist__for_each_entry(evlist, evsel) {
920 if ((evsel->core.attr.read_format & PERF_FORMAT_ID) &&
921 evsel->core.sample_id == NULL &&
922 perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr) < 0)
923 return -ENOMEM;
924 }
925
926 if (perf_cpu_map__empty(cpus))
927 return evlist__mmap_per_thread(evlist, &mp);
928
929 return evlist__mmap_per_cpu(evlist, &mp);
930}
931
932int evlist__mmap(struct evlist *evlist, unsigned int pages)
933{
934 return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
935}
936
937int perf_evlist__create_maps(struct evlist *evlist, struct target *target)
938{
939 bool all_threads = (target->per_thread && target->system_wide);
940 struct perf_cpu_map *cpus;
941 struct perf_thread_map *threads;
942
943 /*
944 * If specify '-a' and '--per-thread' to perf record, perf record
945 * will override '--per-thread'. target->per_thread = false and
946 * target->system_wide = true.
947 *
948 * If specify '--per-thread' only to perf record,
949 * target->per_thread = true and target->system_wide = false.
950 *
951 * So target->per_thread && target->system_wide is false.
952 * For perf record, thread_map__new_str doesn't call
953 * thread_map__new_all_cpus. That will keep perf record's
954 * current behavior.
955 *
956 * For perf stat, it allows the case that target->per_thread and
957 * target->system_wide are all true. It means to collect system-wide
958 * per-thread data. thread_map__new_str will call
959 * thread_map__new_all_cpus to enumerate all threads.
960 */
961 threads = thread_map__new_str(target->pid, target->tid, target->uid,
962 all_threads);
963
964 if (!threads)
965 return -1;
966
967 if (target__uses_dummy_map(target))
968 cpus = perf_cpu_map__dummy_new();
969 else
970 cpus = perf_cpu_map__new(target->cpu_list);
971
972 if (!cpus)
973 goto out_delete_threads;
974
975 evlist->core.has_user_cpus = !!target->cpu_list;
976
977 perf_evlist__set_maps(&evlist->core, cpus, threads);
978
979 return 0;
980
981out_delete_threads:
982 perf_thread_map__put(threads);
983 return -1;
984}
985
986void __perf_evlist__set_sample_bit(struct evlist *evlist,
987 enum perf_event_sample_format bit)
988{
989 struct evsel *evsel;
990
991 evlist__for_each_entry(evlist, evsel)
992 __perf_evsel__set_sample_bit(evsel, bit);
993}
994
995void __perf_evlist__reset_sample_bit(struct evlist *evlist,
996 enum perf_event_sample_format bit)
997{
998 struct evsel *evsel;
999
1000 evlist__for_each_entry(evlist, evsel)
1001 __perf_evsel__reset_sample_bit(evsel, bit);
1002}
1003
1004int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
1005{
1006 struct evsel *evsel;
1007 int err = 0;
1008
1009 evlist__for_each_entry(evlist, evsel) {
1010 if (evsel->filter == NULL)
1011 continue;
1012
1013 /*
1014 * filters only work for tracepoint event, which doesn't have cpu limit.
1015 * So evlist and evsel should always be same.
1016 */
1017 err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
1018 if (err) {
1019 *err_evsel = evsel;
1020 break;
1021 }
1022 }
1023
1024 return err;
1025}
1026
1027int perf_evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1028{
1029 struct evsel *evsel;
1030 int err = 0;
1031
1032 evlist__for_each_entry(evlist, evsel) {
1033 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1034 continue;
1035
1036 err = perf_evsel__set_filter(evsel, filter);
1037 if (err)
1038 break;
1039 }
1040
1041 return err;
1042}
1043
1044int perf_evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1045{
1046 char *filter;
1047 int ret = -1;
1048 size_t i;
1049
1050 for (i = 0; i < npids; ++i) {
1051 if (i == 0) {
1052 if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1053 return -1;
1054 } else {
1055 char *tmp;
1056
1057 if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1058 goto out_free;
1059
1060 free(filter);
1061 filter = tmp;
1062 }
1063 }
1064
1065 ret = perf_evlist__set_tp_filter(evlist, filter);
1066out_free:
1067 free(filter);
1068 return ret;
1069}
1070
1071int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
1072{
1073 return perf_evlist__set_tp_filter_pids(evlist, 1, &pid);
1074}
1075
1076bool perf_evlist__valid_sample_type(struct evlist *evlist)
1077{
1078 struct evsel *pos;
1079
1080 if (evlist->core.nr_entries == 1)
1081 return true;
1082
1083 if (evlist->id_pos < 0 || evlist->is_pos < 0)
1084 return false;
1085
1086 evlist__for_each_entry(evlist, pos) {
1087 if (pos->id_pos != evlist->id_pos ||
1088 pos->is_pos != evlist->is_pos)
1089 return false;
1090 }
1091
1092 return true;
1093}
1094
1095u64 __perf_evlist__combined_sample_type(struct evlist *evlist)
1096{
1097 struct evsel *evsel;
1098
1099 if (evlist->combined_sample_type)
1100 return evlist->combined_sample_type;
1101
1102 evlist__for_each_entry(evlist, evsel)
1103 evlist->combined_sample_type |= evsel->core.attr.sample_type;
1104
1105 return evlist->combined_sample_type;
1106}
1107
1108u64 perf_evlist__combined_sample_type(struct evlist *evlist)
1109{
1110 evlist->combined_sample_type = 0;
1111 return __perf_evlist__combined_sample_type(evlist);
1112}
1113
1114u64 perf_evlist__combined_branch_type(struct evlist *evlist)
1115{
1116 struct evsel *evsel;
1117 u64 branch_type = 0;
1118
1119 evlist__for_each_entry(evlist, evsel)
1120 branch_type |= evsel->core.attr.branch_sample_type;
1121 return branch_type;
1122}
1123
1124bool perf_evlist__valid_read_format(struct evlist *evlist)
1125{
1126 struct evsel *first = evlist__first(evlist), *pos = first;
1127 u64 read_format = first->core.attr.read_format;
1128 u64 sample_type = first->core.attr.sample_type;
1129
1130 evlist__for_each_entry(evlist, pos) {
1131 if (read_format != pos->core.attr.read_format)
1132 return false;
1133 }
1134
1135 /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1136 if ((sample_type & PERF_SAMPLE_READ) &&
1137 !(read_format & PERF_FORMAT_ID)) {
1138 return false;
1139 }
1140
1141 return true;
1142}
1143
1144u16 perf_evlist__id_hdr_size(struct evlist *evlist)
1145{
1146 struct evsel *first = evlist__first(evlist);
1147 struct perf_sample *data;
1148 u64 sample_type;
1149 u16 size = 0;
1150
1151 if (!first->core.attr.sample_id_all)
1152 goto out;
1153
1154 sample_type = first->core.attr.sample_type;
1155
1156 if (sample_type & PERF_SAMPLE_TID)
1157 size += sizeof(data->tid) * 2;
1158
1159 if (sample_type & PERF_SAMPLE_TIME)
1160 size += sizeof(data->time);
1161
1162 if (sample_type & PERF_SAMPLE_ID)
1163 size += sizeof(data->id);
1164
1165 if (sample_type & PERF_SAMPLE_STREAM_ID)
1166 size += sizeof(data->stream_id);
1167
1168 if (sample_type & PERF_SAMPLE_CPU)
1169 size += sizeof(data->cpu) * 2;
1170
1171 if (sample_type & PERF_SAMPLE_IDENTIFIER)
1172 size += sizeof(data->id);
1173out:
1174 return size;
1175}
1176
1177bool perf_evlist__valid_sample_id_all(struct evlist *evlist)
1178{
1179 struct evsel *first = evlist__first(evlist), *pos = first;
1180
1181 evlist__for_each_entry_continue(evlist, pos) {
1182 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1183 return false;
1184 }
1185
1186 return true;
1187}
1188
1189bool perf_evlist__sample_id_all(struct evlist *evlist)
1190{
1191 struct evsel *first = evlist__first(evlist);
1192 return first->core.attr.sample_id_all;
1193}
1194
1195void perf_evlist__set_selected(struct evlist *evlist,
1196 struct evsel *evsel)
1197{
1198 evlist->selected = evsel;
1199}
1200
1201void evlist__close(struct evlist *evlist)
1202{
1203 struct evsel *evsel;
1204
1205 evlist__for_each_entry_reverse(evlist, evsel)
1206 evsel__close(evsel);
1207}
1208
1209static int perf_evlist__create_syswide_maps(struct evlist *evlist)
1210{
1211 struct perf_cpu_map *cpus;
1212 struct perf_thread_map *threads;
1213 int err = -ENOMEM;
1214
1215 /*
1216 * Try reading /sys/devices/system/cpu/online to get
1217 * an all cpus map.
1218 *
1219 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1220 * code needs an overhaul to properly forward the
1221 * error, and we may not want to do that fallback to a
1222 * default cpu identity map :-\
1223 */
1224 cpus = perf_cpu_map__new(NULL);
1225 if (!cpus)
1226 goto out;
1227
1228 threads = perf_thread_map__new_dummy();
1229 if (!threads)
1230 goto out_put;
1231
1232 perf_evlist__set_maps(&evlist->core, cpus, threads);
1233out:
1234 return err;
1235out_put:
1236 perf_cpu_map__put(cpus);
1237 goto out;
1238}
1239
1240int evlist__open(struct evlist *evlist)
1241{
1242 struct evsel *evsel;
1243 int err;
1244
1245 /*
1246 * Default: one fd per CPU, all threads, aka systemwide
1247 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1248 */
1249 if (evlist->core.threads == NULL && evlist->core.cpus == NULL) {
1250 err = perf_evlist__create_syswide_maps(evlist);
1251 if (err < 0)
1252 goto out_err;
1253 }
1254
1255 perf_evlist__update_id_pos(evlist);
1256
1257 evlist__for_each_entry(evlist, evsel) {
1258 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1259 if (err < 0)
1260 goto out_err;
1261 }
1262
1263 return 0;
1264out_err:
1265 evlist__close(evlist);
1266 errno = -err;
1267 return err;
1268}
1269
1270int perf_evlist__prepare_workload(struct evlist *evlist, struct target *target,
1271 const char *argv[], bool pipe_output,
1272 void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1273{
1274 int child_ready_pipe[2], go_pipe[2];
1275 char bf;
1276
1277 if (pipe(child_ready_pipe) < 0) {
1278 perror("failed to create 'ready' pipe");
1279 return -1;
1280 }
1281
1282 if (pipe(go_pipe) < 0) {
1283 perror("failed to create 'go' pipe");
1284 goto out_close_ready_pipe;
1285 }
1286
1287 evlist->workload.pid = fork();
1288 if (evlist->workload.pid < 0) {
1289 perror("failed to fork");
1290 goto out_close_pipes;
1291 }
1292
1293 if (!evlist->workload.pid) {
1294 int ret;
1295
1296 if (pipe_output)
1297 dup2(2, 1);
1298
1299 signal(SIGTERM, SIG_DFL);
1300
1301 close(child_ready_pipe[0]);
1302 close(go_pipe[1]);
1303 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1304
1305 /*
1306 * Tell the parent we're ready to go
1307 */
1308 close(child_ready_pipe[1]);
1309
1310 /*
1311 * Wait until the parent tells us to go.
1312 */
1313 ret = read(go_pipe[0], &bf, 1);
1314 /*
1315 * The parent will ask for the execvp() to be performed by
1316 * writing exactly one byte, in workload.cork_fd, usually via
1317 * perf_evlist__start_workload().
1318 *
1319 * For cancelling the workload without actually running it,
1320 * the parent will just close workload.cork_fd, without writing
1321 * anything, i.e. read will return zero and we just exit()
1322 * here.
1323 */
1324 if (ret != 1) {
1325 if (ret == -1)
1326 perror("unable to read pipe");
1327 exit(ret);
1328 }
1329
1330 execvp(argv[0], (char **)argv);
1331
1332 if (exec_error) {
1333 union sigval val;
1334
1335 val.sival_int = errno;
1336 if (sigqueue(getppid(), SIGUSR1, val))
1337 perror(argv[0]);
1338 } else
1339 perror(argv[0]);
1340 exit(-1);
1341 }
1342
1343 if (exec_error) {
1344 struct sigaction act = {
1345 .sa_flags = SA_SIGINFO,
1346 .sa_sigaction = exec_error,
1347 };
1348 sigaction(SIGUSR1, &act, NULL);
1349 }
1350
1351 if (target__none(target)) {
1352 if (evlist->core.threads == NULL) {
1353 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1354 __func__, __LINE__);
1355 goto out_close_pipes;
1356 }
1357 perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1358 }
1359
1360 close(child_ready_pipe[1]);
1361 close(go_pipe[0]);
1362 /*
1363 * wait for child to settle
1364 */
1365 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1366 perror("unable to read pipe");
1367 goto out_close_pipes;
1368 }
1369
1370 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1371 evlist->workload.cork_fd = go_pipe[1];
1372 close(child_ready_pipe[0]);
1373 return 0;
1374
1375out_close_pipes:
1376 close(go_pipe[0]);
1377 close(go_pipe[1]);
1378out_close_ready_pipe:
1379 close(child_ready_pipe[0]);
1380 close(child_ready_pipe[1]);
1381 return -1;
1382}
1383
1384int perf_evlist__start_workload(struct evlist *evlist)
1385{
1386 if (evlist->workload.cork_fd > 0) {
1387 char bf = 0;
1388 int ret;
1389 /*
1390 * Remove the cork, let it rip!
1391 */
1392 ret = write(evlist->workload.cork_fd, &bf, 1);
1393 if (ret < 0)
1394 perror("unable to write to pipe");
1395
1396 close(evlist->workload.cork_fd);
1397 return ret;
1398 }
1399
1400 return 0;
1401}
1402
1403int perf_evlist__parse_sample(struct evlist *evlist, union perf_event *event,
1404 struct perf_sample *sample)
1405{
1406 struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1407
1408 if (!evsel)
1409 return -EFAULT;
1410 return perf_evsel__parse_sample(evsel, event, sample);
1411}
1412
1413int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
1414 union perf_event *event,
1415 u64 *timestamp)
1416{
1417 struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1418
1419 if (!evsel)
1420 return -EFAULT;
1421 return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1422}
1423
1424int perf_evlist__strerror_open(struct evlist *evlist,
1425 int err, char *buf, size_t size)
1426{
1427 int printed, value;
1428 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1429
1430 switch (err) {
1431 case EACCES:
1432 case EPERM:
1433 printed = scnprintf(buf, size,
1434 "Error:\t%s.\n"
1435 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1436
1437 value = perf_event_paranoid();
1438
1439 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1440
1441 if (value >= 2) {
1442 printed += scnprintf(buf + printed, size - printed,
1443 "For your workloads it needs to be <= 1\nHint:\t");
1444 }
1445 printed += scnprintf(buf + printed, size - printed,
1446 "For system wide tracing it needs to be set to -1.\n");
1447
1448 printed += scnprintf(buf + printed, size - printed,
1449 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1450 "Hint:\tThe current value is %d.", value);
1451 break;
1452 case EINVAL: {
1453 struct evsel *first = evlist__first(evlist);
1454 int max_freq;
1455
1456 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1457 goto out_default;
1458
1459 if (first->core.attr.sample_freq < (u64)max_freq)
1460 goto out_default;
1461
1462 printed = scnprintf(buf, size,
1463 "Error:\t%s.\n"
1464 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1465 "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1466 emsg, max_freq, first->core.attr.sample_freq);
1467 break;
1468 }
1469 default:
1470out_default:
1471 scnprintf(buf, size, "%s", emsg);
1472 break;
1473 }
1474
1475 return 0;
1476}
1477
1478int perf_evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1479{
1480 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1481 int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1482
1483 switch (err) {
1484 case EPERM:
1485 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1486 printed += scnprintf(buf + printed, size - printed,
1487 "Error:\t%s.\n"
1488 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1489 "Hint:\tTried using %zd kB.\n",
1490 emsg, pages_max_per_user, pages_attempted);
1491
1492 if (pages_attempted >= pages_max_per_user) {
1493 printed += scnprintf(buf + printed, size - printed,
1494 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1495 pages_max_per_user + pages_attempted);
1496 }
1497
1498 printed += scnprintf(buf + printed, size - printed,
1499 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1500 break;
1501 default:
1502 scnprintf(buf, size, "%s", emsg);
1503 break;
1504 }
1505
1506 return 0;
1507}
1508
1509void perf_evlist__to_front(struct evlist *evlist,
1510 struct evsel *move_evsel)
1511{
1512 struct evsel *evsel, *n;
1513 LIST_HEAD(move);
1514
1515 if (move_evsel == evlist__first(evlist))
1516 return;
1517
1518 evlist__for_each_entry_safe(evlist, n, evsel) {
1519 if (evsel->leader == move_evsel->leader)
1520 list_move_tail(&evsel->core.node, &move);
1521 }
1522
1523 list_splice(&move, &evlist->core.entries);
1524}
1525
1526void perf_evlist__set_tracking_event(struct evlist *evlist,
1527 struct evsel *tracking_evsel)
1528{
1529 struct evsel *evsel;
1530
1531 if (tracking_evsel->tracking)
1532 return;
1533
1534 evlist__for_each_entry(evlist, evsel) {
1535 if (evsel != tracking_evsel)
1536 evsel->tracking = false;
1537 }
1538
1539 tracking_evsel->tracking = true;
1540}
1541
1542struct evsel *
1543perf_evlist__find_evsel_by_str(struct evlist *evlist,
1544 const char *str)
1545{
1546 struct evsel *evsel;
1547
1548 evlist__for_each_entry(evlist, evsel) {
1549 if (!evsel->name)
1550 continue;
1551 if (strcmp(str, evsel->name) == 0)
1552 return evsel;
1553 }
1554
1555 return NULL;
1556}
1557
1558void perf_evlist__toggle_bkw_mmap(struct evlist *evlist,
1559 enum bkw_mmap_state state)
1560{
1561 enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1562 enum action {
1563 NONE,
1564 PAUSE,
1565 RESUME,
1566 } action = NONE;
1567
1568 if (!evlist->overwrite_mmap)
1569 return;
1570
1571 switch (old_state) {
1572 case BKW_MMAP_NOTREADY: {
1573 if (state != BKW_MMAP_RUNNING)
1574 goto state_err;
1575 break;
1576 }
1577 case BKW_MMAP_RUNNING: {
1578 if (state != BKW_MMAP_DATA_PENDING)
1579 goto state_err;
1580 action = PAUSE;
1581 break;
1582 }
1583 case BKW_MMAP_DATA_PENDING: {
1584 if (state != BKW_MMAP_EMPTY)
1585 goto state_err;
1586 break;
1587 }
1588 case BKW_MMAP_EMPTY: {
1589 if (state != BKW_MMAP_RUNNING)
1590 goto state_err;
1591 action = RESUME;
1592 break;
1593 }
1594 default:
1595 WARN_ONCE(1, "Shouldn't get there\n");
1596 }
1597
1598 evlist->bkw_mmap_state = state;
1599
1600 switch (action) {
1601 case PAUSE:
1602 perf_evlist__pause(evlist);
1603 break;
1604 case RESUME:
1605 perf_evlist__resume(evlist);
1606 break;
1607 case NONE:
1608 default:
1609 break;
1610 }
1611
1612state_err:
1613 return;
1614}
1615
1616bool perf_evlist__exclude_kernel(struct evlist *evlist)
1617{
1618 struct evsel *evsel;
1619
1620 evlist__for_each_entry(evlist, evsel) {
1621 if (!evsel->core.attr.exclude_kernel)
1622 return false;
1623 }
1624
1625 return true;
1626}
1627
1628/*
1629 * Events in data file are not collect in groups, but we still want
1630 * the group display. Set the artificial group and set the leader's
1631 * forced_leader flag to notify the display code.
1632 */
1633void perf_evlist__force_leader(struct evlist *evlist)
1634{
1635 if (!evlist->nr_groups) {
1636 struct evsel *leader = evlist__first(evlist);
1637
1638 perf_evlist__set_leader(evlist);
1639 leader->forced_leader = true;
1640 }
1641}
1642
1643struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list,
1644 struct evsel *evsel)
1645{
1646 struct evsel *c2, *leader;
1647 bool is_open = true;
1648
1649 leader = evsel->leader;
1650 pr_debug("Weak group for %s/%d failed\n",
1651 leader->name, leader->core.nr_members);
1652
1653 /*
1654 * for_each_group_member doesn't work here because it doesn't
1655 * include the first entry.
1656 */
1657 evlist__for_each_entry(evsel_list, c2) {
1658 if (c2 == evsel)
1659 is_open = false;
1660 if (c2->leader == leader) {
1661 if (is_open)
1662 perf_evsel__close(&c2->core);
1663 c2->leader = c2;
1664 c2->core.nr_members = 0;
1665 }
1666 }
1667 return leader;
1668}
1669
1670int perf_evlist__add_sb_event(struct evlist **evlist,
1671 struct perf_event_attr *attr,
1672 perf_evsel__sb_cb_t cb,
1673 void *data)
1674{
1675 struct evsel *evsel;
1676 bool new_evlist = (*evlist) == NULL;
1677
1678 if (*evlist == NULL)
1679 *evlist = evlist__new();
1680 if (*evlist == NULL)
1681 return -1;
1682
1683 if (!attr->sample_id_all) {
1684 pr_warning("enabling sample_id_all for all side band events\n");
1685 attr->sample_id_all = 1;
1686 }
1687
1688 evsel = perf_evsel__new_idx(attr, (*evlist)->core.nr_entries);
1689 if (!evsel)
1690 goto out_err;
1691
1692 evsel->side_band.cb = cb;
1693 evsel->side_band.data = data;
1694 evlist__add(*evlist, evsel);
1695 return 0;
1696
1697out_err:
1698 if (new_evlist) {
1699 evlist__delete(*evlist);
1700 *evlist = NULL;
1701 }
1702 return -1;
1703}
1704
1705static void *perf_evlist__poll_thread(void *arg)
1706{
1707 struct evlist *evlist = arg;
1708 bool draining = false;
1709 int i, done = 0;
1710 /*
1711 * In order to read symbols from other namespaces perf to needs to call
1712 * setns(2). This isn't permitted if the struct_fs has multiple users.
1713 * unshare(2) the fs so that we may continue to setns into namespaces
1714 * that we're observing when, for instance, reading the build-ids at
1715 * the end of a 'perf record' session.
1716 */
1717 unshare(CLONE_FS);
1718
1719 while (!done) {
1720 bool got_data = false;
1721
1722 if (evlist->thread.done)
1723 draining = true;
1724
1725 if (!draining)
1726 evlist__poll(evlist, 1000);
1727
1728 for (i = 0; i < evlist->core.nr_mmaps; i++) {
1729 struct mmap *map = &evlist->mmap[i];
1730 union perf_event *event;
1731
1732 if (perf_mmap__read_init(map))
1733 continue;
1734 while ((event = perf_mmap__read_event(map)) != NULL) {
1735 struct evsel *evsel = perf_evlist__event2evsel(evlist, event);
1736
1737 if (evsel && evsel->side_band.cb)
1738 evsel->side_band.cb(event, evsel->side_band.data);
1739 else
1740 pr_warning("cannot locate proper evsel for the side band event\n");
1741
1742 perf_mmap__consume(map);
1743 got_data = true;
1744 }
1745 perf_mmap__read_done(map);
1746 }
1747
1748 if (draining && !got_data)
1749 break;
1750 }
1751 return NULL;
1752}
1753
1754int perf_evlist__start_sb_thread(struct evlist *evlist,
1755 struct target *target)
1756{
1757 struct evsel *counter;
1758
1759 if (!evlist)
1760 return 0;
1761
1762 if (perf_evlist__create_maps(evlist, target))
1763 goto out_delete_evlist;
1764
1765 evlist__for_each_entry(evlist, counter) {
1766 if (evsel__open(counter, evlist->core.cpus,
1767 evlist->core.threads) < 0)
1768 goto out_delete_evlist;
1769 }
1770
1771 if (evlist__mmap(evlist, UINT_MAX))
1772 goto out_delete_evlist;
1773
1774 evlist__for_each_entry(evlist, counter) {
1775 if (evsel__enable(counter))
1776 goto out_delete_evlist;
1777 }
1778
1779 evlist->thread.done = 0;
1780 if (pthread_create(&evlist->thread.th, NULL, perf_evlist__poll_thread, evlist))
1781 goto out_delete_evlist;
1782
1783 return 0;
1784
1785out_delete_evlist:
1786 evlist__delete(evlist);
1787 evlist = NULL;
1788 return -1;
1789}
1790
1791void perf_evlist__stop_sb_thread(struct evlist *evlist)
1792{
1793 if (!evlist)
1794 return;
1795 evlist->thread.done = 1;
1796 pthread_join(evlist->thread.th, NULL);
1797 evlist__delete(evlist);
1798}