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