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