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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 "debugfs.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 <unistd.h>
18
19#include "parse-events.h"
20
21#include <sys/mman.h>
22
23#include <linux/bitops.h>
24#include <linux/hash.h>
25
26#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
27#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
28
29void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
30 struct thread_map *threads)
31{
32 int i;
33
34 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
35 INIT_HLIST_HEAD(&evlist->heads[i]);
36 INIT_LIST_HEAD(&evlist->entries);
37 perf_evlist__set_maps(evlist, cpus, threads);
38 evlist->workload.pid = -1;
39}
40
41struct perf_evlist *perf_evlist__new(struct cpu_map *cpus,
42 struct thread_map *threads)
43{
44 struct perf_evlist *evlist = zalloc(sizeof(*evlist));
45
46 if (evlist != NULL)
47 perf_evlist__init(evlist, cpus, threads);
48
49 return evlist;
50}
51
52void perf_evlist__config_attrs(struct perf_evlist *evlist,
53 struct perf_record_opts *opts)
54{
55 struct perf_evsel *evsel, *first;
56
57 if (evlist->cpus->map[0] < 0)
58 opts->no_inherit = true;
59
60 first = list_entry(evlist->entries.next, struct perf_evsel, node);
61
62 list_for_each_entry(evsel, &evlist->entries, node) {
63 perf_evsel__config(evsel, opts, first);
64
65 if (evlist->nr_entries > 1)
66 evsel->attr.sample_type |= PERF_SAMPLE_ID;
67 }
68}
69
70static void perf_evlist__purge(struct perf_evlist *evlist)
71{
72 struct perf_evsel *pos, *n;
73
74 list_for_each_entry_safe(pos, n, &evlist->entries, node) {
75 list_del_init(&pos->node);
76 perf_evsel__delete(pos);
77 }
78
79 evlist->nr_entries = 0;
80}
81
82void perf_evlist__exit(struct perf_evlist *evlist)
83{
84 free(evlist->mmap);
85 free(evlist->pollfd);
86 evlist->mmap = NULL;
87 evlist->pollfd = NULL;
88}
89
90void perf_evlist__delete(struct perf_evlist *evlist)
91{
92 perf_evlist__purge(evlist);
93 perf_evlist__exit(evlist);
94 free(evlist);
95}
96
97void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
98{
99 list_add_tail(&entry->node, &evlist->entries);
100 ++evlist->nr_entries;
101}
102
103void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
104 struct list_head *list,
105 int nr_entries)
106{
107 list_splice_tail(list, &evlist->entries);
108 evlist->nr_entries += nr_entries;
109}
110
111int perf_evlist__add_default(struct perf_evlist *evlist)
112{
113 struct perf_event_attr attr = {
114 .type = PERF_TYPE_HARDWARE,
115 .config = PERF_COUNT_HW_CPU_CYCLES,
116 };
117 struct perf_evsel *evsel;
118
119 event_attr_init(&attr);
120
121 evsel = perf_evsel__new(&attr, 0);
122 if (evsel == NULL)
123 goto error;
124
125 /* use strdup() because free(evsel) assumes name is allocated */
126 evsel->name = strdup("cycles");
127 if (!evsel->name)
128 goto error_free;
129
130 perf_evlist__add(evlist, evsel);
131 return 0;
132error_free:
133 perf_evsel__delete(evsel);
134error:
135 return -ENOMEM;
136}
137
138int perf_evlist__add_attrs(struct perf_evlist *evlist,
139 struct perf_event_attr *attrs, size_t nr_attrs)
140{
141 struct perf_evsel *evsel, *n;
142 LIST_HEAD(head);
143 size_t i;
144
145 for (i = 0; i < nr_attrs; i++) {
146 evsel = perf_evsel__new(attrs + i, evlist->nr_entries + i);
147 if (evsel == NULL)
148 goto out_delete_partial_list;
149 list_add_tail(&evsel->node, &head);
150 }
151
152 perf_evlist__splice_list_tail(evlist, &head, nr_attrs);
153
154 return 0;
155
156out_delete_partial_list:
157 list_for_each_entry_safe(evsel, n, &head, node)
158 perf_evsel__delete(evsel);
159 return -1;
160}
161
162int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
163 struct perf_event_attr *attrs, size_t nr_attrs)
164{
165 size_t i;
166
167 for (i = 0; i < nr_attrs; i++)
168 event_attr_init(attrs + i);
169
170 return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
171}
172
173static int trace_event__id(const char *evname)
174{
175 char *filename, *colon;
176 int err = -1, fd;
177
178 if (asprintf(&filename, "%s/%s/id", tracing_events_path, evname) < 0)
179 return -1;
180
181 colon = strrchr(filename, ':');
182 if (colon != NULL)
183 *colon = '/';
184
185 fd = open(filename, O_RDONLY);
186 if (fd >= 0) {
187 char id[16];
188 if (read(fd, id, sizeof(id)) > 0)
189 err = atoi(id);
190 close(fd);
191 }
192
193 free(filename);
194 return err;
195}
196
197int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
198 const char *tracepoints[],
199 size_t nr_tracepoints)
200{
201 int err;
202 size_t i;
203 struct perf_event_attr *attrs = zalloc(nr_tracepoints * sizeof(*attrs));
204
205 if (attrs == NULL)
206 return -1;
207
208 for (i = 0; i < nr_tracepoints; i++) {
209 err = trace_event__id(tracepoints[i]);
210
211 if (err < 0)
212 goto out_free_attrs;
213
214 attrs[i].type = PERF_TYPE_TRACEPOINT;
215 attrs[i].config = err;
216 attrs[i].sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
217 PERF_SAMPLE_CPU);
218 attrs[i].sample_period = 1;
219 }
220
221 err = perf_evlist__add_attrs(evlist, attrs, nr_tracepoints);
222out_free_attrs:
223 free(attrs);
224 return err;
225}
226
227static struct perf_evsel *
228 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
229{
230 struct perf_evsel *evsel;
231
232 list_for_each_entry(evsel, &evlist->entries, node) {
233 if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
234 (int)evsel->attr.config == id)
235 return evsel;
236 }
237
238 return NULL;
239}
240
241int perf_evlist__set_tracepoints_handlers(struct perf_evlist *evlist,
242 const struct perf_evsel_str_handler *assocs,
243 size_t nr_assocs)
244{
245 struct perf_evsel *evsel;
246 int err;
247 size_t i;
248
249 for (i = 0; i < nr_assocs; i++) {
250 err = trace_event__id(assocs[i].name);
251 if (err < 0)
252 goto out;
253
254 evsel = perf_evlist__find_tracepoint_by_id(evlist, err);
255 if (evsel == NULL)
256 continue;
257
258 err = -EEXIST;
259 if (evsel->handler.func != NULL)
260 goto out;
261 evsel->handler.func = assocs[i].handler;
262 }
263
264 err = 0;
265out:
266 return err;
267}
268
269void perf_evlist__disable(struct perf_evlist *evlist)
270{
271 int cpu, thread;
272 struct perf_evsel *pos;
273
274 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
275 list_for_each_entry(pos, &evlist->entries, node) {
276 for (thread = 0; thread < evlist->threads->nr; thread++)
277 ioctl(FD(pos, cpu, thread),
278 PERF_EVENT_IOC_DISABLE, 0);
279 }
280 }
281}
282
283void perf_evlist__enable(struct perf_evlist *evlist)
284{
285 int cpu, thread;
286 struct perf_evsel *pos;
287
288 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
289 list_for_each_entry(pos, &evlist->entries, node) {
290 for (thread = 0; thread < evlist->threads->nr; thread++)
291 ioctl(FD(pos, cpu, thread),
292 PERF_EVENT_IOC_ENABLE, 0);
293 }
294 }
295}
296
297static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
298{
299 int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries;
300 evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
301 return evlist->pollfd != NULL ? 0 : -ENOMEM;
302}
303
304void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
305{
306 fcntl(fd, F_SETFL, O_NONBLOCK);
307 evlist->pollfd[evlist->nr_fds].fd = fd;
308 evlist->pollfd[evlist->nr_fds].events = POLLIN;
309 evlist->nr_fds++;
310}
311
312static void perf_evlist__id_hash(struct perf_evlist *evlist,
313 struct perf_evsel *evsel,
314 int cpu, int thread, u64 id)
315{
316 int hash;
317 struct perf_sample_id *sid = SID(evsel, cpu, thread);
318
319 sid->id = id;
320 sid->evsel = evsel;
321 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
322 hlist_add_head(&sid->node, &evlist->heads[hash]);
323}
324
325void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
326 int cpu, int thread, u64 id)
327{
328 perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
329 evsel->id[evsel->ids++] = id;
330}
331
332static int perf_evlist__id_add_fd(struct perf_evlist *evlist,
333 struct perf_evsel *evsel,
334 int cpu, int thread, int fd)
335{
336 u64 read_data[4] = { 0, };
337 int id_idx = 1; /* The first entry is the counter value */
338
339 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
340 read(fd, &read_data, sizeof(read_data)) == -1)
341 return -1;
342
343 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
344 ++id_idx;
345 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
346 ++id_idx;
347
348 perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]);
349 return 0;
350}
351
352struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
353{
354 struct hlist_head *head;
355 struct hlist_node *pos;
356 struct perf_sample_id *sid;
357 int hash;
358
359 if (evlist->nr_entries == 1)
360 return list_entry(evlist->entries.next, struct perf_evsel, node);
361
362 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
363 head = &evlist->heads[hash];
364
365 hlist_for_each_entry(sid, pos, head, node)
366 if (sid->id == id)
367 return sid->evsel;
368
369 if (!perf_evlist__sample_id_all(evlist))
370 return list_entry(evlist->entries.next, struct perf_evsel, node);
371
372 return NULL;
373}
374
375union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
376{
377 /* XXX Move this to perf.c, making it generally available */
378 unsigned int page_size = sysconf(_SC_PAGE_SIZE);
379 struct perf_mmap *md = &evlist->mmap[idx];
380 unsigned int head = perf_mmap__read_head(md);
381 unsigned int old = md->prev;
382 unsigned char *data = md->base + page_size;
383 union perf_event *event = NULL;
384
385 if (evlist->overwrite) {
386 /*
387 * If we're further behind than half the buffer, there's a chance
388 * the writer will bite our tail and mess up the samples under us.
389 *
390 * If we somehow ended up ahead of the head, we got messed up.
391 *
392 * In either case, truncate and restart at head.
393 */
394 int diff = head - old;
395 if (diff > md->mask / 2 || diff < 0) {
396 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
397
398 /*
399 * head points to a known good entry, start there.
400 */
401 old = head;
402 }
403 }
404
405 if (old != head) {
406 size_t size;
407
408 event = (union perf_event *)&data[old & md->mask];
409 size = event->header.size;
410
411 /*
412 * Event straddles the mmap boundary -- header should always
413 * be inside due to u64 alignment of output.
414 */
415 if ((old & md->mask) + size != ((old + size) & md->mask)) {
416 unsigned int offset = old;
417 unsigned int len = min(sizeof(*event), size), cpy;
418 void *dst = &evlist->event_copy;
419
420 do {
421 cpy = min(md->mask + 1 - (offset & md->mask), len);
422 memcpy(dst, &data[offset & md->mask], cpy);
423 offset += cpy;
424 dst += cpy;
425 len -= cpy;
426 } while (len);
427
428 event = &evlist->event_copy;
429 }
430
431 old += size;
432 }
433
434 md->prev = old;
435
436 if (!evlist->overwrite)
437 perf_mmap__write_tail(md, old);
438
439 return event;
440}
441
442void perf_evlist__munmap(struct perf_evlist *evlist)
443{
444 int i;
445
446 for (i = 0; i < evlist->nr_mmaps; i++) {
447 if (evlist->mmap[i].base != NULL) {
448 munmap(evlist->mmap[i].base, evlist->mmap_len);
449 evlist->mmap[i].base = NULL;
450 }
451 }
452
453 free(evlist->mmap);
454 evlist->mmap = NULL;
455}
456
457static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
458{
459 evlist->nr_mmaps = evlist->cpus->nr;
460 if (evlist->cpus->map[0] == -1)
461 evlist->nr_mmaps = evlist->threads->nr;
462 evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
463 return evlist->mmap != NULL ? 0 : -ENOMEM;
464}
465
466static int __perf_evlist__mmap(struct perf_evlist *evlist,
467 int idx, int prot, int mask, int fd)
468{
469 evlist->mmap[idx].prev = 0;
470 evlist->mmap[idx].mask = mask;
471 evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
472 MAP_SHARED, fd, 0);
473 if (evlist->mmap[idx].base == MAP_FAILED) {
474 evlist->mmap[idx].base = NULL;
475 return -1;
476 }
477
478 perf_evlist__add_pollfd(evlist, fd);
479 return 0;
480}
481
482static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
483{
484 struct perf_evsel *evsel;
485 int cpu, thread;
486
487 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
488 int output = -1;
489
490 for (thread = 0; thread < evlist->threads->nr; thread++) {
491 list_for_each_entry(evsel, &evlist->entries, node) {
492 int fd = FD(evsel, cpu, thread);
493
494 if (output == -1) {
495 output = fd;
496 if (__perf_evlist__mmap(evlist, cpu,
497 prot, mask, output) < 0)
498 goto out_unmap;
499 } else {
500 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
501 goto out_unmap;
502 }
503
504 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
505 perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
506 goto out_unmap;
507 }
508 }
509 }
510
511 return 0;
512
513out_unmap:
514 for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
515 if (evlist->mmap[cpu].base != NULL) {
516 munmap(evlist->mmap[cpu].base, evlist->mmap_len);
517 evlist->mmap[cpu].base = NULL;
518 }
519 }
520 return -1;
521}
522
523static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
524{
525 struct perf_evsel *evsel;
526 int thread;
527
528 for (thread = 0; thread < evlist->threads->nr; thread++) {
529 int output = -1;
530
531 list_for_each_entry(evsel, &evlist->entries, node) {
532 int fd = FD(evsel, 0, thread);
533
534 if (output == -1) {
535 output = fd;
536 if (__perf_evlist__mmap(evlist, thread,
537 prot, mask, output) < 0)
538 goto out_unmap;
539 } else {
540 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
541 goto out_unmap;
542 }
543
544 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
545 perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
546 goto out_unmap;
547 }
548 }
549
550 return 0;
551
552out_unmap:
553 for (thread = 0; thread < evlist->threads->nr; thread++) {
554 if (evlist->mmap[thread].base != NULL) {
555 munmap(evlist->mmap[thread].base, evlist->mmap_len);
556 evlist->mmap[thread].base = NULL;
557 }
558 }
559 return -1;
560}
561
562/** perf_evlist__mmap - Create per cpu maps to receive events
563 *
564 * @evlist - list of events
565 * @pages - map length in pages
566 * @overwrite - overwrite older events?
567 *
568 * If overwrite is false the user needs to signal event consuption using:
569 *
570 * struct perf_mmap *m = &evlist->mmap[cpu];
571 * unsigned int head = perf_mmap__read_head(m);
572 *
573 * perf_mmap__write_tail(m, head)
574 *
575 * Using perf_evlist__read_on_cpu does this automatically.
576 */
577int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
578 bool overwrite)
579{
580 unsigned int page_size = sysconf(_SC_PAGE_SIZE);
581 struct perf_evsel *evsel;
582 const struct cpu_map *cpus = evlist->cpus;
583 const struct thread_map *threads = evlist->threads;
584 int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
585
586 /* 512 kiB: default amount of unprivileged mlocked memory */
587 if (pages == UINT_MAX)
588 pages = (512 * 1024) / page_size;
589 else if (!is_power_of_2(pages))
590 return -EINVAL;
591
592 mask = pages * page_size - 1;
593
594 if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
595 return -ENOMEM;
596
597 if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
598 return -ENOMEM;
599
600 evlist->overwrite = overwrite;
601 evlist->mmap_len = (pages + 1) * page_size;
602
603 list_for_each_entry(evsel, &evlist->entries, node) {
604 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
605 evsel->sample_id == NULL &&
606 perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0)
607 return -ENOMEM;
608 }
609
610 if (evlist->cpus->map[0] == -1)
611 return perf_evlist__mmap_per_thread(evlist, prot, mask);
612
613 return perf_evlist__mmap_per_cpu(evlist, prot, mask);
614}
615
616int perf_evlist__create_maps(struct perf_evlist *evlist,
617 struct perf_target *target)
618{
619 evlist->threads = thread_map__new_str(target->pid, target->tid,
620 target->uid);
621
622 if (evlist->threads == NULL)
623 return -1;
624
625 if (perf_target__has_task(target))
626 evlist->cpus = cpu_map__dummy_new();
627 else if (!perf_target__has_cpu(target) && !target->uses_mmap)
628 evlist->cpus = cpu_map__dummy_new();
629 else
630 evlist->cpus = cpu_map__new(target->cpu_list);
631
632 if (evlist->cpus == NULL)
633 goto out_delete_threads;
634
635 return 0;
636
637out_delete_threads:
638 thread_map__delete(evlist->threads);
639 return -1;
640}
641
642void perf_evlist__delete_maps(struct perf_evlist *evlist)
643{
644 cpu_map__delete(evlist->cpus);
645 thread_map__delete(evlist->threads);
646 evlist->cpus = NULL;
647 evlist->threads = NULL;
648}
649
650int perf_evlist__set_filters(struct perf_evlist *evlist)
651{
652 const struct thread_map *threads = evlist->threads;
653 const struct cpu_map *cpus = evlist->cpus;
654 struct perf_evsel *evsel;
655 char *filter;
656 int thread;
657 int cpu;
658 int err;
659 int fd;
660
661 list_for_each_entry(evsel, &evlist->entries, node) {
662 filter = evsel->filter;
663 if (!filter)
664 continue;
665 for (cpu = 0; cpu < cpus->nr; cpu++) {
666 for (thread = 0; thread < threads->nr; thread++) {
667 fd = FD(evsel, cpu, thread);
668 err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
669 if (err)
670 return err;
671 }
672 }
673 }
674
675 return 0;
676}
677
678bool perf_evlist__valid_sample_type(const struct perf_evlist *evlist)
679{
680 struct perf_evsel *pos, *first;
681
682 pos = first = list_entry(evlist->entries.next, struct perf_evsel, node);
683
684 list_for_each_entry_continue(pos, &evlist->entries, node) {
685 if (first->attr.sample_type != pos->attr.sample_type)
686 return false;
687 }
688
689 return true;
690}
691
692u64 perf_evlist__sample_type(const struct perf_evlist *evlist)
693{
694 struct perf_evsel *first;
695
696 first = list_entry(evlist->entries.next, struct perf_evsel, node);
697 return first->attr.sample_type;
698}
699
700u16 perf_evlist__id_hdr_size(const struct perf_evlist *evlist)
701{
702 struct perf_evsel *first;
703 struct perf_sample *data;
704 u64 sample_type;
705 u16 size = 0;
706
707 first = list_entry(evlist->entries.next, struct perf_evsel, node);
708
709 if (!first->attr.sample_id_all)
710 goto out;
711
712 sample_type = first->attr.sample_type;
713
714 if (sample_type & PERF_SAMPLE_TID)
715 size += sizeof(data->tid) * 2;
716
717 if (sample_type & PERF_SAMPLE_TIME)
718 size += sizeof(data->time);
719
720 if (sample_type & PERF_SAMPLE_ID)
721 size += sizeof(data->id);
722
723 if (sample_type & PERF_SAMPLE_STREAM_ID)
724 size += sizeof(data->stream_id);
725
726 if (sample_type & PERF_SAMPLE_CPU)
727 size += sizeof(data->cpu) * 2;
728out:
729 return size;
730}
731
732bool perf_evlist__valid_sample_id_all(const struct perf_evlist *evlist)
733{
734 struct perf_evsel *pos, *first;
735
736 pos = first = list_entry(evlist->entries.next, struct perf_evsel, node);
737
738 list_for_each_entry_continue(pos, &evlist->entries, node) {
739 if (first->attr.sample_id_all != pos->attr.sample_id_all)
740 return false;
741 }
742
743 return true;
744}
745
746bool perf_evlist__sample_id_all(const struct perf_evlist *evlist)
747{
748 struct perf_evsel *first;
749
750 first = list_entry(evlist->entries.next, struct perf_evsel, node);
751 return first->attr.sample_id_all;
752}
753
754void perf_evlist__set_selected(struct perf_evlist *evlist,
755 struct perf_evsel *evsel)
756{
757 evlist->selected = evsel;
758}
759
760int perf_evlist__open(struct perf_evlist *evlist, bool group)
761{
762 struct perf_evsel *evsel, *first;
763 int err, ncpus, nthreads;
764
765 first = list_entry(evlist->entries.next, struct perf_evsel, node);
766
767 list_for_each_entry(evsel, &evlist->entries, node) {
768 struct xyarray *group_fd = NULL;
769
770 if (group && evsel != first)
771 group_fd = first->fd;
772
773 err = perf_evsel__open(evsel, evlist->cpus, evlist->threads,
774 group, group_fd);
775 if (err < 0)
776 goto out_err;
777 }
778
779 return 0;
780out_err:
781 ncpus = evlist->cpus ? evlist->cpus->nr : 1;
782 nthreads = evlist->threads ? evlist->threads->nr : 1;
783
784 list_for_each_entry_reverse(evsel, &evlist->entries, node)
785 perf_evsel__close(evsel, ncpus, nthreads);
786
787 errno = -err;
788 return err;
789}
790
791int perf_evlist__prepare_workload(struct perf_evlist *evlist,
792 struct perf_record_opts *opts,
793 const char *argv[])
794{
795 int child_ready_pipe[2], go_pipe[2];
796 char bf;
797
798 if (pipe(child_ready_pipe) < 0) {
799 perror("failed to create 'ready' pipe");
800 return -1;
801 }
802
803 if (pipe(go_pipe) < 0) {
804 perror("failed to create 'go' pipe");
805 goto out_close_ready_pipe;
806 }
807
808 evlist->workload.pid = fork();
809 if (evlist->workload.pid < 0) {
810 perror("failed to fork");
811 goto out_close_pipes;
812 }
813
814 if (!evlist->workload.pid) {
815 if (opts->pipe_output)
816 dup2(2, 1);
817
818 close(child_ready_pipe[0]);
819 close(go_pipe[1]);
820 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
821
822 /*
823 * Do a dummy execvp to get the PLT entry resolved,
824 * so we avoid the resolver overhead on the real
825 * execvp call.
826 */
827 execvp("", (char **)argv);
828
829 /*
830 * Tell the parent we're ready to go
831 */
832 close(child_ready_pipe[1]);
833
834 /*
835 * Wait until the parent tells us to go.
836 */
837 if (read(go_pipe[0], &bf, 1) == -1)
838 perror("unable to read pipe");
839
840 execvp(argv[0], (char **)argv);
841
842 perror(argv[0]);
843 kill(getppid(), SIGUSR1);
844 exit(-1);
845 }
846
847 if (perf_target__none(&opts->target))
848 evlist->threads->map[0] = evlist->workload.pid;
849
850 close(child_ready_pipe[1]);
851 close(go_pipe[0]);
852 /*
853 * wait for child to settle
854 */
855 if (read(child_ready_pipe[0], &bf, 1) == -1) {
856 perror("unable to read pipe");
857 goto out_close_pipes;
858 }
859
860 evlist->workload.cork_fd = go_pipe[1];
861 close(child_ready_pipe[0]);
862 return 0;
863
864out_close_pipes:
865 close(go_pipe[0]);
866 close(go_pipe[1]);
867out_close_ready_pipe:
868 close(child_ready_pipe[0]);
869 close(child_ready_pipe[1]);
870 return -1;
871}
872
873int perf_evlist__start_workload(struct perf_evlist *evlist)
874{
875 if (evlist->workload.cork_fd > 0) {
876 /*
877 * Remove the cork, let it rip!
878 */
879 return close(evlist->workload.cork_fd);
880 }
881
882 return 0;
883}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
4 *
5 * Parts came from builtin-{top,stat,record}.c, see those files for further
6 * copyright notes.
7 */
8#include <api/fs/fs.h>
9#include <errno.h>
10#include <inttypes.h>
11#include <poll.h>
12#include "cpumap.h"
13#include "util/mmap.h"
14#include "thread_map.h"
15#include "target.h"
16#include "evlist.h"
17#include "evsel.h"
18#include "record.h"
19#include "debug.h"
20#include "units.h"
21#include "bpf_counter.h"
22#include <internal/lib.h> // page_size
23#include "affinity.h"
24#include "../perf.h"
25#include "asm/bug.h"
26#include "bpf-event.h"
27#include "util/event.h"
28#include "util/string2.h"
29#include "util/perf_api_probe.h"
30#include "util/evsel_fprintf.h"
31#include "util/evlist-hybrid.h"
32#include "util/pmu.h"
33#include "util/sample.h"
34#include <signal.h>
35#include <unistd.h>
36#include <sched.h>
37#include <stdlib.h>
38
39#include "parse-events.h"
40#include <subcmd/parse-options.h>
41
42#include <fcntl.h>
43#include <sys/ioctl.h>
44#include <sys/mman.h>
45#include <sys/prctl.h>
46#include <sys/timerfd.h>
47
48#include <linux/bitops.h>
49#include <linux/hash.h>
50#include <linux/log2.h>
51#include <linux/err.h>
52#include <linux/string.h>
53#include <linux/time64.h>
54#include <linux/zalloc.h>
55#include <perf/evlist.h>
56#include <perf/evsel.h>
57#include <perf/cpumap.h>
58#include <perf/mmap.h>
59
60#include <internal/xyarray.h>
61
62#ifdef LACKS_SIGQUEUE_PROTOTYPE
63int sigqueue(pid_t pid, int sig, const union sigval value);
64#endif
65
66#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
67#define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
68
69void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
70 struct perf_thread_map *threads)
71{
72 perf_evlist__init(&evlist->core);
73 perf_evlist__set_maps(&evlist->core, cpus, threads);
74 evlist->workload.pid = -1;
75 evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
76 evlist->ctl_fd.fd = -1;
77 evlist->ctl_fd.ack = -1;
78 evlist->ctl_fd.pos = -1;
79}
80
81struct evlist *evlist__new(void)
82{
83 struct evlist *evlist = zalloc(sizeof(*evlist));
84
85 if (evlist != NULL)
86 evlist__init(evlist, NULL, NULL);
87
88 return evlist;
89}
90
91struct evlist *evlist__new_default(void)
92{
93 struct evlist *evlist = evlist__new();
94
95 if (evlist && evlist__add_default(evlist)) {
96 evlist__delete(evlist);
97 evlist = NULL;
98 }
99
100 return evlist;
101}
102
103struct evlist *evlist__new_dummy(void)
104{
105 struct evlist *evlist = evlist__new();
106
107 if (evlist && evlist__add_dummy(evlist)) {
108 evlist__delete(evlist);
109 evlist = NULL;
110 }
111
112 return evlist;
113}
114
115/**
116 * evlist__set_id_pos - set the positions of event ids.
117 * @evlist: selected event list
118 *
119 * Events with compatible sample types all have the same id_pos
120 * and is_pos. For convenience, put a copy on evlist.
121 */
122void evlist__set_id_pos(struct evlist *evlist)
123{
124 struct evsel *first = evlist__first(evlist);
125
126 evlist->id_pos = first->id_pos;
127 evlist->is_pos = first->is_pos;
128}
129
130static void evlist__update_id_pos(struct evlist *evlist)
131{
132 struct evsel *evsel;
133
134 evlist__for_each_entry(evlist, evsel)
135 evsel__calc_id_pos(evsel);
136
137 evlist__set_id_pos(evlist);
138}
139
140static void evlist__purge(struct evlist *evlist)
141{
142 struct evsel *pos, *n;
143
144 evlist__for_each_entry_safe(evlist, n, pos) {
145 list_del_init(&pos->core.node);
146 pos->evlist = NULL;
147 evsel__delete(pos);
148 }
149
150 evlist->core.nr_entries = 0;
151}
152
153void evlist__exit(struct evlist *evlist)
154{
155 event_enable_timer__exit(&evlist->eet);
156 zfree(&evlist->mmap);
157 zfree(&evlist->overwrite_mmap);
158 perf_evlist__exit(&evlist->core);
159}
160
161void evlist__delete(struct evlist *evlist)
162{
163 if (evlist == NULL)
164 return;
165
166 evlist__munmap(evlist);
167 evlist__close(evlist);
168 evlist__purge(evlist);
169 evlist__exit(evlist);
170 free(evlist);
171}
172
173void evlist__add(struct evlist *evlist, struct evsel *entry)
174{
175 perf_evlist__add(&evlist->core, &entry->core);
176 entry->evlist = evlist;
177 entry->tracking = !entry->core.idx;
178
179 if (evlist->core.nr_entries == 1)
180 evlist__set_id_pos(evlist);
181}
182
183void evlist__remove(struct evlist *evlist, struct evsel *evsel)
184{
185 evsel->evlist = NULL;
186 perf_evlist__remove(&evlist->core, &evsel->core);
187}
188
189void evlist__splice_list_tail(struct evlist *evlist, struct list_head *list)
190{
191 while (!list_empty(list)) {
192 struct evsel *evsel, *temp, *leader = NULL;
193
194 __evlist__for_each_entry_safe(list, temp, evsel) {
195 list_del_init(&evsel->core.node);
196 evlist__add(evlist, evsel);
197 leader = evsel;
198 break;
199 }
200
201 __evlist__for_each_entry_safe(list, temp, evsel) {
202 if (evsel__has_leader(evsel, leader)) {
203 list_del_init(&evsel->core.node);
204 evlist__add(evlist, evsel);
205 }
206 }
207 }
208}
209
210int __evlist__set_tracepoints_handlers(struct evlist *evlist,
211 const struct evsel_str_handler *assocs, size_t nr_assocs)
212{
213 size_t i;
214 int err;
215
216 for (i = 0; i < nr_assocs; i++) {
217 // Adding a handler for an event not in this evlist, just ignore it.
218 struct evsel *evsel = evlist__find_tracepoint_by_name(evlist, assocs[i].name);
219 if (evsel == NULL)
220 continue;
221
222 err = -EEXIST;
223 if (evsel->handler != NULL)
224 goto out;
225 evsel->handler = assocs[i].handler;
226 }
227
228 err = 0;
229out:
230 return err;
231}
232
233static void evlist__set_leader(struct evlist *evlist)
234{
235 perf_evlist__set_leader(&evlist->core);
236}
237
238int __evlist__add_default(struct evlist *evlist, bool precise)
239{
240 struct evsel *evsel;
241
242 evsel = evsel__new_cycles(precise, PERF_TYPE_HARDWARE,
243 PERF_COUNT_HW_CPU_CYCLES);
244 if (evsel == NULL)
245 return -ENOMEM;
246
247 evlist__add(evlist, evsel);
248 return 0;
249}
250
251static struct evsel *evlist__dummy_event(struct evlist *evlist)
252{
253 struct perf_event_attr attr = {
254 .type = PERF_TYPE_SOFTWARE,
255 .config = PERF_COUNT_SW_DUMMY,
256 .size = sizeof(attr), /* to capture ABI version */
257 };
258
259 return evsel__new_idx(&attr, evlist->core.nr_entries);
260}
261
262int evlist__add_dummy(struct evlist *evlist)
263{
264 struct evsel *evsel = evlist__dummy_event(evlist);
265
266 if (evsel == NULL)
267 return -ENOMEM;
268
269 evlist__add(evlist, evsel);
270 return 0;
271}
272
273struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide)
274{
275 struct evsel *evsel = evlist__dummy_event(evlist);
276
277 if (!evsel)
278 return NULL;
279
280 evsel->core.attr.exclude_kernel = 1;
281 evsel->core.attr.exclude_guest = 1;
282 evsel->core.attr.exclude_hv = 1;
283 evsel->core.attr.freq = 0;
284 evsel->core.attr.sample_period = 1;
285 evsel->core.system_wide = system_wide;
286 evsel->no_aux_samples = true;
287 evsel->name = strdup("dummy:u");
288
289 evlist__add(evlist, evsel);
290 return evsel;
291}
292
293#ifdef HAVE_LIBTRACEEVENT
294struct evsel *evlist__add_sched_switch(struct evlist *evlist, bool system_wide)
295{
296 struct evsel *evsel = evsel__newtp_idx("sched", "sched_switch", 0);
297
298 if (IS_ERR(evsel))
299 return evsel;
300
301 evsel__set_sample_bit(evsel, CPU);
302 evsel__set_sample_bit(evsel, TIME);
303
304 evsel->core.system_wide = system_wide;
305 evsel->no_aux_samples = true;
306
307 evlist__add(evlist, evsel);
308 return evsel;
309}
310#endif
311
312int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
313{
314 struct evsel *evsel, *n;
315 LIST_HEAD(head);
316 size_t i;
317
318 for (i = 0; i < nr_attrs; i++) {
319 evsel = evsel__new_idx(attrs + i, evlist->core.nr_entries + i);
320 if (evsel == NULL)
321 goto out_delete_partial_list;
322 list_add_tail(&evsel->core.node, &head);
323 }
324
325 evlist__splice_list_tail(evlist, &head);
326
327 return 0;
328
329out_delete_partial_list:
330 __evlist__for_each_entry_safe(&head, n, evsel)
331 evsel__delete(evsel);
332 return -1;
333}
334
335int __evlist__add_default_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
336{
337 size_t i;
338
339 for (i = 0; i < nr_attrs; i++)
340 event_attr_init(attrs + i);
341
342 return evlist__add_attrs(evlist, attrs, nr_attrs);
343}
344
345__weak int arch_evlist__add_default_attrs(struct evlist *evlist,
346 struct perf_event_attr *attrs,
347 size_t nr_attrs)
348{
349 if (!nr_attrs)
350 return 0;
351
352 return __evlist__add_default_attrs(evlist, attrs, nr_attrs);
353}
354
355struct evsel *evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
356{
357 struct evsel *evsel;
358
359 evlist__for_each_entry(evlist, evsel) {
360 if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
361 (int)evsel->core.attr.config == id)
362 return evsel;
363 }
364
365 return NULL;
366}
367
368struct evsel *evlist__find_tracepoint_by_name(struct evlist *evlist, const char *name)
369{
370 struct evsel *evsel;
371
372 evlist__for_each_entry(evlist, evsel) {
373 if ((evsel->core.attr.type == PERF_TYPE_TRACEPOINT) &&
374 (strcmp(evsel->name, name) == 0))
375 return evsel;
376 }
377
378 return NULL;
379}
380
381#ifdef HAVE_LIBTRACEEVENT
382int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler)
383{
384 struct evsel *evsel = evsel__newtp(sys, name);
385
386 if (IS_ERR(evsel))
387 return -1;
388
389 evsel->handler = handler;
390 evlist__add(evlist, evsel);
391 return 0;
392}
393#endif
394
395struct evlist_cpu_iterator evlist__cpu_begin(struct evlist *evlist, struct affinity *affinity)
396{
397 struct evlist_cpu_iterator itr = {
398 .container = evlist,
399 .evsel = NULL,
400 .cpu_map_idx = 0,
401 .evlist_cpu_map_idx = 0,
402 .evlist_cpu_map_nr = perf_cpu_map__nr(evlist->core.all_cpus),
403 .cpu = (struct perf_cpu){ .cpu = -1},
404 .affinity = affinity,
405 };
406
407 if (evlist__empty(evlist)) {
408 /* Ensure the empty list doesn't iterate. */
409 itr.evlist_cpu_map_idx = itr.evlist_cpu_map_nr;
410 } else {
411 itr.evsel = evlist__first(evlist);
412 if (itr.affinity) {
413 itr.cpu = perf_cpu_map__cpu(evlist->core.all_cpus, 0);
414 affinity__set(itr.affinity, itr.cpu.cpu);
415 itr.cpu_map_idx = perf_cpu_map__idx(itr.evsel->core.cpus, itr.cpu);
416 /*
417 * If this CPU isn't in the evsel's cpu map then advance
418 * through the list.
419 */
420 if (itr.cpu_map_idx == -1)
421 evlist_cpu_iterator__next(&itr);
422 }
423 }
424 return itr;
425}
426
427void evlist_cpu_iterator__next(struct evlist_cpu_iterator *evlist_cpu_itr)
428{
429 while (evlist_cpu_itr->evsel != evlist__last(evlist_cpu_itr->container)) {
430 evlist_cpu_itr->evsel = evsel__next(evlist_cpu_itr->evsel);
431 evlist_cpu_itr->cpu_map_idx =
432 perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
433 evlist_cpu_itr->cpu);
434 if (evlist_cpu_itr->cpu_map_idx != -1)
435 return;
436 }
437 evlist_cpu_itr->evlist_cpu_map_idx++;
438 if (evlist_cpu_itr->evlist_cpu_map_idx < evlist_cpu_itr->evlist_cpu_map_nr) {
439 evlist_cpu_itr->evsel = evlist__first(evlist_cpu_itr->container);
440 evlist_cpu_itr->cpu =
441 perf_cpu_map__cpu(evlist_cpu_itr->container->core.all_cpus,
442 evlist_cpu_itr->evlist_cpu_map_idx);
443 if (evlist_cpu_itr->affinity)
444 affinity__set(evlist_cpu_itr->affinity, evlist_cpu_itr->cpu.cpu);
445 evlist_cpu_itr->cpu_map_idx =
446 perf_cpu_map__idx(evlist_cpu_itr->evsel->core.cpus,
447 evlist_cpu_itr->cpu);
448 /*
449 * If this CPU isn't in the evsel's cpu map then advance through
450 * the list.
451 */
452 if (evlist_cpu_itr->cpu_map_idx == -1)
453 evlist_cpu_iterator__next(evlist_cpu_itr);
454 }
455}
456
457bool evlist_cpu_iterator__end(const struct evlist_cpu_iterator *evlist_cpu_itr)
458{
459 return evlist_cpu_itr->evlist_cpu_map_idx >= evlist_cpu_itr->evlist_cpu_map_nr;
460}
461
462static int evsel__strcmp(struct evsel *pos, char *evsel_name)
463{
464 if (!evsel_name)
465 return 0;
466 if (evsel__is_dummy_event(pos))
467 return 1;
468 return strcmp(pos->name, evsel_name);
469}
470
471static int evlist__is_enabled(struct evlist *evlist)
472{
473 struct evsel *pos;
474
475 evlist__for_each_entry(evlist, pos) {
476 if (!evsel__is_group_leader(pos) || !pos->core.fd)
477 continue;
478 /* If at least one event is enabled, evlist is enabled. */
479 if (!pos->disabled)
480 return true;
481 }
482 return false;
483}
484
485static void __evlist__disable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
486{
487 struct evsel *pos;
488 struct evlist_cpu_iterator evlist_cpu_itr;
489 struct affinity saved_affinity, *affinity = NULL;
490 bool has_imm = false;
491
492 // See explanation in evlist__close()
493 if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
494 if (affinity__setup(&saved_affinity) < 0)
495 return;
496 affinity = &saved_affinity;
497 }
498
499 /* Disable 'immediate' events last */
500 for (int imm = 0; imm <= 1; imm++) {
501 evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
502 pos = evlist_cpu_itr.evsel;
503 if (evsel__strcmp(pos, evsel_name))
504 continue;
505 if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
506 continue;
507 if (excl_dummy && evsel__is_dummy_event(pos))
508 continue;
509 if (pos->immediate)
510 has_imm = true;
511 if (pos->immediate != imm)
512 continue;
513 evsel__disable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
514 }
515 if (!has_imm)
516 break;
517 }
518
519 affinity__cleanup(affinity);
520 evlist__for_each_entry(evlist, pos) {
521 if (evsel__strcmp(pos, evsel_name))
522 continue;
523 if (!evsel__is_group_leader(pos) || !pos->core.fd)
524 continue;
525 if (excl_dummy && evsel__is_dummy_event(pos))
526 continue;
527 pos->disabled = true;
528 }
529
530 /*
531 * If we disabled only single event, we need to check
532 * the enabled state of the evlist manually.
533 */
534 if (evsel_name)
535 evlist->enabled = evlist__is_enabled(evlist);
536 else
537 evlist->enabled = false;
538}
539
540void evlist__disable(struct evlist *evlist)
541{
542 __evlist__disable(evlist, NULL, false);
543}
544
545void evlist__disable_non_dummy(struct evlist *evlist)
546{
547 __evlist__disable(evlist, NULL, true);
548}
549
550void evlist__disable_evsel(struct evlist *evlist, char *evsel_name)
551{
552 __evlist__disable(evlist, evsel_name, false);
553}
554
555static void __evlist__enable(struct evlist *evlist, char *evsel_name, bool excl_dummy)
556{
557 struct evsel *pos;
558 struct evlist_cpu_iterator evlist_cpu_itr;
559 struct affinity saved_affinity, *affinity = NULL;
560
561 // See explanation in evlist__close()
562 if (!cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
563 if (affinity__setup(&saved_affinity) < 0)
564 return;
565 affinity = &saved_affinity;
566 }
567
568 evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
569 pos = evlist_cpu_itr.evsel;
570 if (evsel__strcmp(pos, evsel_name))
571 continue;
572 if (!evsel__is_group_leader(pos) || !pos->core.fd)
573 continue;
574 if (excl_dummy && evsel__is_dummy_event(pos))
575 continue;
576 evsel__enable_cpu(pos, evlist_cpu_itr.cpu_map_idx);
577 }
578 affinity__cleanup(affinity);
579 evlist__for_each_entry(evlist, pos) {
580 if (evsel__strcmp(pos, evsel_name))
581 continue;
582 if (!evsel__is_group_leader(pos) || !pos->core.fd)
583 continue;
584 if (excl_dummy && evsel__is_dummy_event(pos))
585 continue;
586 pos->disabled = false;
587 }
588
589 /*
590 * Even single event sets the 'enabled' for evlist,
591 * so the toggle can work properly and toggle to
592 * 'disabled' state.
593 */
594 evlist->enabled = true;
595}
596
597void evlist__enable(struct evlist *evlist)
598{
599 __evlist__enable(evlist, NULL, false);
600}
601
602void evlist__enable_non_dummy(struct evlist *evlist)
603{
604 __evlist__enable(evlist, NULL, true);
605}
606
607void evlist__enable_evsel(struct evlist *evlist, char *evsel_name)
608{
609 __evlist__enable(evlist, evsel_name, false);
610}
611
612void evlist__toggle_enable(struct evlist *evlist)
613{
614 (evlist->enabled ? evlist__disable : evlist__enable)(evlist);
615}
616
617int evlist__add_pollfd(struct evlist *evlist, int fd)
618{
619 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default);
620}
621
622int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
623{
624 return perf_evlist__filter_pollfd(&evlist->core, revents_and_mask);
625}
626
627#ifdef HAVE_EVENTFD_SUPPORT
628int evlist__add_wakeup_eventfd(struct evlist *evlist, int fd)
629{
630 return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
631 fdarray_flag__nonfilterable |
632 fdarray_flag__non_perf_event);
633}
634#endif
635
636int evlist__poll(struct evlist *evlist, int timeout)
637{
638 return perf_evlist__poll(&evlist->core, timeout);
639}
640
641struct perf_sample_id *evlist__id2sid(struct evlist *evlist, u64 id)
642{
643 struct hlist_head *head;
644 struct perf_sample_id *sid;
645 int hash;
646
647 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
648 head = &evlist->core.heads[hash];
649
650 hlist_for_each_entry(sid, head, node)
651 if (sid->id == id)
652 return sid;
653
654 return NULL;
655}
656
657struct evsel *evlist__id2evsel(struct evlist *evlist, u64 id)
658{
659 struct perf_sample_id *sid;
660
661 if (evlist->core.nr_entries == 1 || !id)
662 return evlist__first(evlist);
663
664 sid = evlist__id2sid(evlist, id);
665 if (sid)
666 return container_of(sid->evsel, struct evsel, core);
667
668 if (!evlist__sample_id_all(evlist))
669 return evlist__first(evlist);
670
671 return NULL;
672}
673
674struct evsel *evlist__id2evsel_strict(struct evlist *evlist, u64 id)
675{
676 struct perf_sample_id *sid;
677
678 if (!id)
679 return NULL;
680
681 sid = evlist__id2sid(evlist, id);
682 if (sid)
683 return container_of(sid->evsel, struct evsel, core);
684
685 return NULL;
686}
687
688static int evlist__event2id(struct evlist *evlist, union perf_event *event, u64 *id)
689{
690 const __u64 *array = event->sample.array;
691 ssize_t n;
692
693 n = (event->header.size - sizeof(event->header)) >> 3;
694
695 if (event->header.type == PERF_RECORD_SAMPLE) {
696 if (evlist->id_pos >= n)
697 return -1;
698 *id = array[evlist->id_pos];
699 } else {
700 if (evlist->is_pos > n)
701 return -1;
702 n -= evlist->is_pos;
703 *id = array[n];
704 }
705 return 0;
706}
707
708struct evsel *evlist__event2evsel(struct evlist *evlist, union perf_event *event)
709{
710 struct evsel *first = evlist__first(evlist);
711 struct hlist_head *head;
712 struct perf_sample_id *sid;
713 int hash;
714 u64 id;
715
716 if (evlist->core.nr_entries == 1)
717 return first;
718
719 if (!first->core.attr.sample_id_all &&
720 event->header.type != PERF_RECORD_SAMPLE)
721 return first;
722
723 if (evlist__event2id(evlist, event, &id))
724 return NULL;
725
726 /* Synthesized events have an id of zero */
727 if (!id)
728 return first;
729
730 hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
731 head = &evlist->core.heads[hash];
732
733 hlist_for_each_entry(sid, head, node) {
734 if (sid->id == id)
735 return container_of(sid->evsel, struct evsel, core);
736 }
737 return NULL;
738}
739
740static int evlist__set_paused(struct evlist *evlist, bool value)
741{
742 int i;
743
744 if (!evlist->overwrite_mmap)
745 return 0;
746
747 for (i = 0; i < evlist->core.nr_mmaps; i++) {
748 int fd = evlist->overwrite_mmap[i].core.fd;
749 int err;
750
751 if (fd < 0)
752 continue;
753 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
754 if (err)
755 return err;
756 }
757 return 0;
758}
759
760static int evlist__pause(struct evlist *evlist)
761{
762 return evlist__set_paused(evlist, true);
763}
764
765static int evlist__resume(struct evlist *evlist)
766{
767 return evlist__set_paused(evlist, false);
768}
769
770static void evlist__munmap_nofree(struct evlist *evlist)
771{
772 int i;
773
774 if (evlist->mmap)
775 for (i = 0; i < evlist->core.nr_mmaps; i++)
776 perf_mmap__munmap(&evlist->mmap[i].core);
777
778 if (evlist->overwrite_mmap)
779 for (i = 0; i < evlist->core.nr_mmaps; i++)
780 perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
781}
782
783void evlist__munmap(struct evlist *evlist)
784{
785 evlist__munmap_nofree(evlist);
786 zfree(&evlist->mmap);
787 zfree(&evlist->overwrite_mmap);
788}
789
790static void perf_mmap__unmap_cb(struct perf_mmap *map)
791{
792 struct mmap *m = container_of(map, struct mmap, core);
793
794 mmap__munmap(m);
795}
796
797static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
798 bool overwrite)
799{
800 int i;
801 struct mmap *map;
802
803 map = zalloc(evlist->core.nr_mmaps * sizeof(struct mmap));
804 if (!map)
805 return NULL;
806
807 for (i = 0; i < evlist->core.nr_mmaps; i++) {
808 struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
809
810 /*
811 * When the perf_mmap() call is made we grab one refcount, plus
812 * one extra to let perf_mmap__consume() get the last
813 * events after all real references (perf_mmap__get()) are
814 * dropped.
815 *
816 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
817 * thus does perf_mmap__get() on it.
818 */
819 perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
820 }
821
822 return map;
823}
824
825static void
826perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
827 struct perf_evsel *_evsel,
828 struct perf_mmap_param *_mp,
829 int idx)
830{
831 struct evlist *evlist = container_of(_evlist, struct evlist, core);
832 struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
833 struct evsel *evsel = container_of(_evsel, struct evsel, core);
834
835 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, evsel, idx);
836}
837
838static struct perf_mmap*
839perf_evlist__mmap_cb_get(struct perf_evlist *_evlist, bool overwrite, int idx)
840{
841 struct evlist *evlist = container_of(_evlist, struct evlist, core);
842 struct mmap *maps;
843
844 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
845
846 if (!maps) {
847 maps = evlist__alloc_mmap(evlist, overwrite);
848 if (!maps)
849 return NULL;
850
851 if (overwrite) {
852 evlist->overwrite_mmap = maps;
853 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
854 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
855 } else {
856 evlist->mmap = maps;
857 }
858 }
859
860 return &maps[idx].core;
861}
862
863static int
864perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
865 int output, struct perf_cpu cpu)
866{
867 struct mmap *map = container_of(_map, struct mmap, core);
868 struct mmap_params *mp = container_of(_mp, struct mmap_params, core);
869
870 return mmap__mmap(map, mp, output, cpu);
871}
872
873unsigned long perf_event_mlock_kb_in_pages(void)
874{
875 unsigned long pages;
876 int max;
877
878 if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
879 /*
880 * Pick a once upon a time good value, i.e. things look
881 * strange since we can't read a sysctl value, but lets not
882 * die yet...
883 */
884 max = 512;
885 } else {
886 max -= (page_size / 1024);
887 }
888
889 pages = (max * 1024) / page_size;
890 if (!is_power_of_2(pages))
891 pages = rounddown_pow_of_two(pages);
892
893 return pages;
894}
895
896size_t evlist__mmap_size(unsigned long pages)
897{
898 if (pages == UINT_MAX)
899 pages = perf_event_mlock_kb_in_pages();
900 else if (!is_power_of_2(pages))
901 return 0;
902
903 return (pages + 1) * page_size;
904}
905
906static long parse_pages_arg(const char *str, unsigned long min,
907 unsigned long max)
908{
909 unsigned long pages, val;
910 static struct parse_tag tags[] = {
911 { .tag = 'B', .mult = 1 },
912 { .tag = 'K', .mult = 1 << 10 },
913 { .tag = 'M', .mult = 1 << 20 },
914 { .tag = 'G', .mult = 1 << 30 },
915 { .tag = 0 },
916 };
917
918 if (str == NULL)
919 return -EINVAL;
920
921 val = parse_tag_value(str, tags);
922 if (val != (unsigned long) -1) {
923 /* we got file size value */
924 pages = PERF_ALIGN(val, page_size) / page_size;
925 } else {
926 /* we got pages count value */
927 char *eptr;
928 pages = strtoul(str, &eptr, 10);
929 if (*eptr != '\0')
930 return -EINVAL;
931 }
932
933 if (pages == 0 && min == 0) {
934 /* leave number of pages at 0 */
935 } else if (!is_power_of_2(pages)) {
936 char buf[100];
937
938 /* round pages up to next power of 2 */
939 pages = roundup_pow_of_two(pages);
940 if (!pages)
941 return -EINVAL;
942
943 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
944 pr_info("rounding mmap pages size to %s (%lu pages)\n",
945 buf, pages);
946 }
947
948 if (pages > max)
949 return -EINVAL;
950
951 return pages;
952}
953
954int __evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
955{
956 unsigned long max = UINT_MAX;
957 long pages;
958
959 if (max > SIZE_MAX / page_size)
960 max = SIZE_MAX / page_size;
961
962 pages = parse_pages_arg(str, 1, max);
963 if (pages < 0) {
964 pr_err("Invalid argument for --mmap_pages/-m\n");
965 return -1;
966 }
967
968 *mmap_pages = pages;
969 return 0;
970}
971
972int evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset __maybe_unused)
973{
974 return __evlist__parse_mmap_pages(opt->value, str);
975}
976
977/**
978 * evlist__mmap_ex - Create mmaps to receive events.
979 * @evlist: list of events
980 * @pages: map length in pages
981 * @overwrite: overwrite older events?
982 * @auxtrace_pages - auxtrace map length in pages
983 * @auxtrace_overwrite - overwrite older auxtrace data?
984 *
985 * If @overwrite is %false the user needs to signal event consumption using
986 * perf_mmap__write_tail(). Using evlist__mmap_read() does this
987 * automatically.
988 *
989 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
990 * consumption using auxtrace_mmap__write_tail().
991 *
992 * Return: %0 on success, negative error code otherwise.
993 */
994int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
995 unsigned int auxtrace_pages,
996 bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
997 int comp_level)
998{
999 /*
1000 * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1001 * Its value is decided by evsel's write_backward.
1002 * So &mp should not be passed through const pointer.
1003 */
1004 struct mmap_params mp = {
1005 .nr_cblocks = nr_cblocks,
1006 .affinity = affinity,
1007 .flush = flush,
1008 .comp_level = comp_level
1009 };
1010 struct perf_evlist_mmap_ops ops = {
1011 .idx = perf_evlist__mmap_cb_idx,
1012 .get = perf_evlist__mmap_cb_get,
1013 .mmap = perf_evlist__mmap_cb_mmap,
1014 };
1015
1016 evlist->core.mmap_len = evlist__mmap_size(pages);
1017 pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
1018
1019 auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
1020 auxtrace_pages, auxtrace_overwrite);
1021
1022 return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
1023}
1024
1025int evlist__mmap(struct evlist *evlist, unsigned int pages)
1026{
1027 return evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS, 1, 0);
1028}
1029
1030int evlist__create_maps(struct evlist *evlist, struct target *target)
1031{
1032 bool all_threads = (target->per_thread && target->system_wide);
1033 struct perf_cpu_map *cpus;
1034 struct perf_thread_map *threads;
1035
1036 /*
1037 * If specify '-a' and '--per-thread' to perf record, perf record
1038 * will override '--per-thread'. target->per_thread = false and
1039 * target->system_wide = true.
1040 *
1041 * If specify '--per-thread' only to perf record,
1042 * target->per_thread = true and target->system_wide = false.
1043 *
1044 * So target->per_thread && target->system_wide is false.
1045 * For perf record, thread_map__new_str doesn't call
1046 * thread_map__new_all_cpus. That will keep perf record's
1047 * current behavior.
1048 *
1049 * For perf stat, it allows the case that target->per_thread and
1050 * target->system_wide are all true. It means to collect system-wide
1051 * per-thread data. thread_map__new_str will call
1052 * thread_map__new_all_cpus to enumerate all threads.
1053 */
1054 threads = thread_map__new_str(target->pid, target->tid, target->uid,
1055 all_threads);
1056
1057 if (!threads)
1058 return -1;
1059
1060 if (target__uses_dummy_map(target))
1061 cpus = perf_cpu_map__dummy_new();
1062 else
1063 cpus = perf_cpu_map__new(target->cpu_list);
1064
1065 if (!cpus)
1066 goto out_delete_threads;
1067
1068 evlist->core.has_user_cpus = !!target->cpu_list && !target->hybrid;
1069
1070 perf_evlist__set_maps(&evlist->core, cpus, threads);
1071
1072 /* as evlist now has references, put count here */
1073 perf_cpu_map__put(cpus);
1074 perf_thread_map__put(threads);
1075
1076 return 0;
1077
1078out_delete_threads:
1079 perf_thread_map__put(threads);
1080 return -1;
1081}
1082
1083int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel)
1084{
1085 struct evsel *evsel;
1086 int err = 0;
1087
1088 evlist__for_each_entry(evlist, evsel) {
1089 if (evsel->filter == NULL)
1090 continue;
1091
1092 /*
1093 * filters only work for tracepoint event, which doesn't have cpu limit.
1094 * So evlist and evsel should always be same.
1095 */
1096 err = perf_evsel__apply_filter(&evsel->core, evsel->filter);
1097 if (err) {
1098 *err_evsel = evsel;
1099 break;
1100 }
1101 }
1102
1103 return err;
1104}
1105
1106int evlist__set_tp_filter(struct evlist *evlist, const char *filter)
1107{
1108 struct evsel *evsel;
1109 int err = 0;
1110
1111 if (filter == NULL)
1112 return -1;
1113
1114 evlist__for_each_entry(evlist, evsel) {
1115 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1116 continue;
1117
1118 err = evsel__set_filter(evsel, filter);
1119 if (err)
1120 break;
1121 }
1122
1123 return err;
1124}
1125
1126int evlist__append_tp_filter(struct evlist *evlist, const char *filter)
1127{
1128 struct evsel *evsel;
1129 int err = 0;
1130
1131 if (filter == NULL)
1132 return -1;
1133
1134 evlist__for_each_entry(evlist, evsel) {
1135 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
1136 continue;
1137
1138 err = evsel__append_tp_filter(evsel, filter);
1139 if (err)
1140 break;
1141 }
1142
1143 return err;
1144}
1145
1146char *asprintf__tp_filter_pids(size_t npids, pid_t *pids)
1147{
1148 char *filter;
1149 size_t i;
1150
1151 for (i = 0; i < npids; ++i) {
1152 if (i == 0) {
1153 if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1154 return NULL;
1155 } else {
1156 char *tmp;
1157
1158 if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1159 goto out_free;
1160
1161 free(filter);
1162 filter = tmp;
1163 }
1164 }
1165
1166 return filter;
1167out_free:
1168 free(filter);
1169 return NULL;
1170}
1171
1172int evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1173{
1174 char *filter = asprintf__tp_filter_pids(npids, pids);
1175 int ret = evlist__set_tp_filter(evlist, filter);
1176
1177 free(filter);
1178 return ret;
1179}
1180
1181int evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid)
1182{
1183 return evlist__set_tp_filter_pids(evlist, 1, &pid);
1184}
1185
1186int evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids)
1187{
1188 char *filter = asprintf__tp_filter_pids(npids, pids);
1189 int ret = evlist__append_tp_filter(evlist, filter);
1190
1191 free(filter);
1192 return ret;
1193}
1194
1195int evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
1196{
1197 return evlist__append_tp_filter_pids(evlist, 1, &pid);
1198}
1199
1200bool evlist__valid_sample_type(struct evlist *evlist)
1201{
1202 struct evsel *pos;
1203
1204 if (evlist->core.nr_entries == 1)
1205 return true;
1206
1207 if (evlist->id_pos < 0 || evlist->is_pos < 0)
1208 return false;
1209
1210 evlist__for_each_entry(evlist, pos) {
1211 if (pos->id_pos != evlist->id_pos ||
1212 pos->is_pos != evlist->is_pos)
1213 return false;
1214 }
1215
1216 return true;
1217}
1218
1219u64 __evlist__combined_sample_type(struct evlist *evlist)
1220{
1221 struct evsel *evsel;
1222
1223 if (evlist->combined_sample_type)
1224 return evlist->combined_sample_type;
1225
1226 evlist__for_each_entry(evlist, evsel)
1227 evlist->combined_sample_type |= evsel->core.attr.sample_type;
1228
1229 return evlist->combined_sample_type;
1230}
1231
1232u64 evlist__combined_sample_type(struct evlist *evlist)
1233{
1234 evlist->combined_sample_type = 0;
1235 return __evlist__combined_sample_type(evlist);
1236}
1237
1238u64 evlist__combined_branch_type(struct evlist *evlist)
1239{
1240 struct evsel *evsel;
1241 u64 branch_type = 0;
1242
1243 evlist__for_each_entry(evlist, evsel)
1244 branch_type |= evsel->core.attr.branch_sample_type;
1245 return branch_type;
1246}
1247
1248bool evlist__valid_read_format(struct evlist *evlist)
1249{
1250 struct evsel *first = evlist__first(evlist), *pos = first;
1251 u64 read_format = first->core.attr.read_format;
1252 u64 sample_type = first->core.attr.sample_type;
1253
1254 evlist__for_each_entry(evlist, pos) {
1255 if (read_format != pos->core.attr.read_format) {
1256 pr_debug("Read format differs %#" PRIx64 " vs %#" PRIx64 "\n",
1257 read_format, (u64)pos->core.attr.read_format);
1258 }
1259 }
1260
1261 /* PERF_SAMPLE_READ implies PERF_FORMAT_ID. */
1262 if ((sample_type & PERF_SAMPLE_READ) &&
1263 !(read_format & PERF_FORMAT_ID)) {
1264 return false;
1265 }
1266
1267 return true;
1268}
1269
1270u16 evlist__id_hdr_size(struct evlist *evlist)
1271{
1272 struct evsel *first = evlist__first(evlist);
1273
1274 return first->core.attr.sample_id_all ? evsel__id_hdr_size(first) : 0;
1275}
1276
1277bool evlist__valid_sample_id_all(struct evlist *evlist)
1278{
1279 struct evsel *first = evlist__first(evlist), *pos = first;
1280
1281 evlist__for_each_entry_continue(evlist, pos) {
1282 if (first->core.attr.sample_id_all != pos->core.attr.sample_id_all)
1283 return false;
1284 }
1285
1286 return true;
1287}
1288
1289bool evlist__sample_id_all(struct evlist *evlist)
1290{
1291 struct evsel *first = evlist__first(evlist);
1292 return first->core.attr.sample_id_all;
1293}
1294
1295void evlist__set_selected(struct evlist *evlist, struct evsel *evsel)
1296{
1297 evlist->selected = evsel;
1298}
1299
1300void evlist__close(struct evlist *evlist)
1301{
1302 struct evsel *evsel;
1303 struct evlist_cpu_iterator evlist_cpu_itr;
1304 struct affinity affinity;
1305
1306 /*
1307 * With perf record core.user_requested_cpus is usually NULL.
1308 * Use the old method to handle this for now.
1309 */
1310 if (!evlist->core.user_requested_cpus ||
1311 cpu_map__is_dummy(evlist->core.user_requested_cpus)) {
1312 evlist__for_each_entry_reverse(evlist, evsel)
1313 evsel__close(evsel);
1314 return;
1315 }
1316
1317 if (affinity__setup(&affinity) < 0)
1318 return;
1319
1320 evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) {
1321 perf_evsel__close_cpu(&evlist_cpu_itr.evsel->core,
1322 evlist_cpu_itr.cpu_map_idx);
1323 }
1324
1325 affinity__cleanup(&affinity);
1326 evlist__for_each_entry_reverse(evlist, evsel) {
1327 perf_evsel__free_fd(&evsel->core);
1328 perf_evsel__free_id(&evsel->core);
1329 }
1330 perf_evlist__reset_id_hash(&evlist->core);
1331}
1332
1333static int evlist__create_syswide_maps(struct evlist *evlist)
1334{
1335 struct perf_cpu_map *cpus;
1336 struct perf_thread_map *threads;
1337
1338 /*
1339 * Try reading /sys/devices/system/cpu/online to get
1340 * an all cpus map.
1341 *
1342 * FIXME: -ENOMEM is the best we can do here, the cpu_map
1343 * code needs an overhaul to properly forward the
1344 * error, and we may not want to do that fallback to a
1345 * default cpu identity map :-\
1346 */
1347 cpus = perf_cpu_map__new(NULL);
1348 if (!cpus)
1349 goto out;
1350
1351 threads = perf_thread_map__new_dummy();
1352 if (!threads)
1353 goto out_put;
1354
1355 perf_evlist__set_maps(&evlist->core, cpus, threads);
1356
1357 perf_thread_map__put(threads);
1358out_put:
1359 perf_cpu_map__put(cpus);
1360out:
1361 return -ENOMEM;
1362}
1363
1364int evlist__open(struct evlist *evlist)
1365{
1366 struct evsel *evsel;
1367 int err;
1368
1369 /*
1370 * Default: one fd per CPU, all threads, aka systemwide
1371 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1372 */
1373 if (evlist->core.threads == NULL && evlist->core.user_requested_cpus == NULL) {
1374 err = evlist__create_syswide_maps(evlist);
1375 if (err < 0)
1376 goto out_err;
1377 }
1378
1379 evlist__update_id_pos(evlist);
1380
1381 evlist__for_each_entry(evlist, evsel) {
1382 err = evsel__open(evsel, evsel->core.cpus, evsel->core.threads);
1383 if (err < 0)
1384 goto out_err;
1385 }
1386
1387 return 0;
1388out_err:
1389 evlist__close(evlist);
1390 errno = -err;
1391 return err;
1392}
1393
1394int evlist__prepare_workload(struct evlist *evlist, struct target *target, const char *argv[],
1395 bool pipe_output, void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1396{
1397 int child_ready_pipe[2], go_pipe[2];
1398 char bf;
1399
1400 if (pipe(child_ready_pipe) < 0) {
1401 perror("failed to create 'ready' pipe");
1402 return -1;
1403 }
1404
1405 if (pipe(go_pipe) < 0) {
1406 perror("failed to create 'go' pipe");
1407 goto out_close_ready_pipe;
1408 }
1409
1410 evlist->workload.pid = fork();
1411 if (evlist->workload.pid < 0) {
1412 perror("failed to fork");
1413 goto out_close_pipes;
1414 }
1415
1416 if (!evlist->workload.pid) {
1417 int ret;
1418
1419 if (pipe_output)
1420 dup2(2, 1);
1421
1422 signal(SIGTERM, SIG_DFL);
1423
1424 close(child_ready_pipe[0]);
1425 close(go_pipe[1]);
1426 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1427
1428 /*
1429 * Change the name of this process not to confuse --exclude-perf users
1430 * that sees 'perf' in the window up to the execvp() and thinks that
1431 * perf samples are not being excluded.
1432 */
1433 prctl(PR_SET_NAME, "perf-exec");
1434
1435 /*
1436 * Tell the parent we're ready to go
1437 */
1438 close(child_ready_pipe[1]);
1439
1440 /*
1441 * Wait until the parent tells us to go.
1442 */
1443 ret = read(go_pipe[0], &bf, 1);
1444 /*
1445 * The parent will ask for the execvp() to be performed by
1446 * writing exactly one byte, in workload.cork_fd, usually via
1447 * evlist__start_workload().
1448 *
1449 * For cancelling the workload without actually running it,
1450 * the parent will just close workload.cork_fd, without writing
1451 * anything, i.e. read will return zero and we just exit()
1452 * here.
1453 */
1454 if (ret != 1) {
1455 if (ret == -1)
1456 perror("unable to read pipe");
1457 exit(ret);
1458 }
1459
1460 execvp(argv[0], (char **)argv);
1461
1462 if (exec_error) {
1463 union sigval val;
1464
1465 val.sival_int = errno;
1466 if (sigqueue(getppid(), SIGUSR1, val))
1467 perror(argv[0]);
1468 } else
1469 perror(argv[0]);
1470 exit(-1);
1471 }
1472
1473 if (exec_error) {
1474 struct sigaction act = {
1475 .sa_flags = SA_SIGINFO,
1476 .sa_sigaction = exec_error,
1477 };
1478 sigaction(SIGUSR1, &act, NULL);
1479 }
1480
1481 if (target__none(target)) {
1482 if (evlist->core.threads == NULL) {
1483 fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1484 __func__, __LINE__);
1485 goto out_close_pipes;
1486 }
1487 perf_thread_map__set_pid(evlist->core.threads, 0, evlist->workload.pid);
1488 }
1489
1490 close(child_ready_pipe[1]);
1491 close(go_pipe[0]);
1492 /*
1493 * wait for child to settle
1494 */
1495 if (read(child_ready_pipe[0], &bf, 1) == -1) {
1496 perror("unable to read pipe");
1497 goto out_close_pipes;
1498 }
1499
1500 fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1501 evlist->workload.cork_fd = go_pipe[1];
1502 close(child_ready_pipe[0]);
1503 return 0;
1504
1505out_close_pipes:
1506 close(go_pipe[0]);
1507 close(go_pipe[1]);
1508out_close_ready_pipe:
1509 close(child_ready_pipe[0]);
1510 close(child_ready_pipe[1]);
1511 return -1;
1512}
1513
1514int evlist__start_workload(struct evlist *evlist)
1515{
1516 if (evlist->workload.cork_fd > 0) {
1517 char bf = 0;
1518 int ret;
1519 /*
1520 * Remove the cork, let it rip!
1521 */
1522 ret = write(evlist->workload.cork_fd, &bf, 1);
1523 if (ret < 0)
1524 perror("unable to write to pipe");
1525
1526 close(evlist->workload.cork_fd);
1527 return ret;
1528 }
1529
1530 return 0;
1531}
1532
1533int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
1534{
1535 struct evsel *evsel = evlist__event2evsel(evlist, event);
1536 int ret;
1537
1538 if (!evsel)
1539 return -EFAULT;
1540 ret = evsel__parse_sample(evsel, event, sample);
1541 if (ret)
1542 return ret;
1543 if (perf_guest && sample->id) {
1544 struct perf_sample_id *sid = evlist__id2sid(evlist, sample->id);
1545
1546 if (sid) {
1547 sample->machine_pid = sid->machine_pid;
1548 sample->vcpu = sid->vcpu.cpu;
1549 }
1550 }
1551 return 0;
1552}
1553
1554int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp)
1555{
1556 struct evsel *evsel = evlist__event2evsel(evlist, event);
1557
1558 if (!evsel)
1559 return -EFAULT;
1560 return evsel__parse_sample_timestamp(evsel, event, timestamp);
1561}
1562
1563int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
1564{
1565 int printed, value;
1566 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1567
1568 switch (err) {
1569 case EACCES:
1570 case EPERM:
1571 printed = scnprintf(buf, size,
1572 "Error:\t%s.\n"
1573 "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1574
1575 value = perf_event_paranoid();
1576
1577 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1578
1579 if (value >= 2) {
1580 printed += scnprintf(buf + printed, size - printed,
1581 "For your workloads it needs to be <= 1\nHint:\t");
1582 }
1583 printed += scnprintf(buf + printed, size - printed,
1584 "For system wide tracing it needs to be set to -1.\n");
1585
1586 printed += scnprintf(buf + printed, size - printed,
1587 "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1588 "Hint:\tThe current value is %d.", value);
1589 break;
1590 case EINVAL: {
1591 struct evsel *first = evlist__first(evlist);
1592 int max_freq;
1593
1594 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1595 goto out_default;
1596
1597 if (first->core.attr.sample_freq < (u64)max_freq)
1598 goto out_default;
1599
1600 printed = scnprintf(buf, size,
1601 "Error:\t%s.\n"
1602 "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1603 "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1604 emsg, max_freq, first->core.attr.sample_freq);
1605 break;
1606 }
1607 default:
1608out_default:
1609 scnprintf(buf, size, "%s", emsg);
1610 break;
1611 }
1612
1613 return 0;
1614}
1615
1616int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
1617{
1618 char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1619 int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
1620
1621 switch (err) {
1622 case EPERM:
1623 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1624 printed += scnprintf(buf + printed, size - printed,
1625 "Error:\t%s.\n"
1626 "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1627 "Hint:\tTried using %zd kB.\n",
1628 emsg, pages_max_per_user, pages_attempted);
1629
1630 if (pages_attempted >= pages_max_per_user) {
1631 printed += scnprintf(buf + printed, size - printed,
1632 "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1633 pages_max_per_user + pages_attempted);
1634 }
1635
1636 printed += scnprintf(buf + printed, size - printed,
1637 "Hint:\tTry using a smaller -m/--mmap-pages value.");
1638 break;
1639 default:
1640 scnprintf(buf, size, "%s", emsg);
1641 break;
1642 }
1643
1644 return 0;
1645}
1646
1647void evlist__to_front(struct evlist *evlist, struct evsel *move_evsel)
1648{
1649 struct evsel *evsel, *n;
1650 LIST_HEAD(move);
1651
1652 if (move_evsel == evlist__first(evlist))
1653 return;
1654
1655 evlist__for_each_entry_safe(evlist, n, evsel) {
1656 if (evsel__leader(evsel) == evsel__leader(move_evsel))
1657 list_move_tail(&evsel->core.node, &move);
1658 }
1659
1660 list_splice(&move, &evlist->core.entries);
1661}
1662
1663struct evsel *evlist__get_tracking_event(struct evlist *evlist)
1664{
1665 struct evsel *evsel;
1666
1667 evlist__for_each_entry(evlist, evsel) {
1668 if (evsel->tracking)
1669 return evsel;
1670 }
1671
1672 return evlist__first(evlist);
1673}
1674
1675void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_evsel)
1676{
1677 struct evsel *evsel;
1678
1679 if (tracking_evsel->tracking)
1680 return;
1681
1682 evlist__for_each_entry(evlist, evsel) {
1683 if (evsel != tracking_evsel)
1684 evsel->tracking = false;
1685 }
1686
1687 tracking_evsel->tracking = true;
1688}
1689
1690struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str)
1691{
1692 struct evsel *evsel;
1693
1694 evlist__for_each_entry(evlist, evsel) {
1695 if (!evsel->name)
1696 continue;
1697 if (strcmp(str, evsel->name) == 0)
1698 return evsel;
1699 }
1700
1701 return NULL;
1702}
1703
1704void evlist__toggle_bkw_mmap(struct evlist *evlist, enum bkw_mmap_state state)
1705{
1706 enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1707 enum action {
1708 NONE,
1709 PAUSE,
1710 RESUME,
1711 } action = NONE;
1712
1713 if (!evlist->overwrite_mmap)
1714 return;
1715
1716 switch (old_state) {
1717 case BKW_MMAP_NOTREADY: {
1718 if (state != BKW_MMAP_RUNNING)
1719 goto state_err;
1720 break;
1721 }
1722 case BKW_MMAP_RUNNING: {
1723 if (state != BKW_MMAP_DATA_PENDING)
1724 goto state_err;
1725 action = PAUSE;
1726 break;
1727 }
1728 case BKW_MMAP_DATA_PENDING: {
1729 if (state != BKW_MMAP_EMPTY)
1730 goto state_err;
1731 break;
1732 }
1733 case BKW_MMAP_EMPTY: {
1734 if (state != BKW_MMAP_RUNNING)
1735 goto state_err;
1736 action = RESUME;
1737 break;
1738 }
1739 default:
1740 WARN_ONCE(1, "Shouldn't get there\n");
1741 }
1742
1743 evlist->bkw_mmap_state = state;
1744
1745 switch (action) {
1746 case PAUSE:
1747 evlist__pause(evlist);
1748 break;
1749 case RESUME:
1750 evlist__resume(evlist);
1751 break;
1752 case NONE:
1753 default:
1754 break;
1755 }
1756
1757state_err:
1758 return;
1759}
1760
1761bool evlist__exclude_kernel(struct evlist *evlist)
1762{
1763 struct evsel *evsel;
1764
1765 evlist__for_each_entry(evlist, evsel) {
1766 if (!evsel->core.attr.exclude_kernel)
1767 return false;
1768 }
1769
1770 return true;
1771}
1772
1773/*
1774 * Events in data file are not collect in groups, but we still want
1775 * the group display. Set the artificial group and set the leader's
1776 * forced_leader flag to notify the display code.
1777 */
1778void evlist__force_leader(struct evlist *evlist)
1779{
1780 if (!evlist->core.nr_groups) {
1781 struct evsel *leader = evlist__first(evlist);
1782
1783 evlist__set_leader(evlist);
1784 leader->forced_leader = true;
1785 }
1786}
1787
1788struct evsel *evlist__reset_weak_group(struct evlist *evsel_list, struct evsel *evsel, bool close)
1789{
1790 struct evsel *c2, *leader;
1791 bool is_open = true;
1792
1793 leader = evsel__leader(evsel);
1794
1795 pr_debug("Weak group for %s/%d failed\n",
1796 leader->name, leader->core.nr_members);
1797
1798 /*
1799 * for_each_group_member doesn't work here because it doesn't
1800 * include the first entry.
1801 */
1802 evlist__for_each_entry(evsel_list, c2) {
1803 if (c2 == evsel)
1804 is_open = false;
1805 if (evsel__has_leader(c2, leader)) {
1806 if (is_open && close)
1807 perf_evsel__close(&c2->core);
1808 /*
1809 * We want to close all members of the group and reopen
1810 * them. Some events, like Intel topdown, require being
1811 * in a group and so keep these in the group.
1812 */
1813 evsel__remove_from_group(c2, leader);
1814
1815 /*
1816 * Set this for all former members of the group
1817 * to indicate they get reopened.
1818 */
1819 c2->reset_group = true;
1820 }
1821 }
1822 /* Reset the leader count if all entries were removed. */
1823 if (leader->core.nr_members == 1)
1824 leader->core.nr_members = 0;
1825 return leader;
1826}
1827
1828static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1829{
1830 char *s, *p;
1831 int ret = 0, fd;
1832
1833 if (strncmp(str, "fifo:", 5))
1834 return -EINVAL;
1835
1836 str += 5;
1837 if (!*str || *str == ',')
1838 return -EINVAL;
1839
1840 s = strdup(str);
1841 if (!s)
1842 return -ENOMEM;
1843
1844 p = strchr(s, ',');
1845 if (p)
1846 *p = '\0';
1847
1848 /*
1849 * O_RDWR avoids POLLHUPs which is necessary to allow the other
1850 * end of a FIFO to be repeatedly opened and closed.
1851 */
1852 fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1853 if (fd < 0) {
1854 pr_err("Failed to open '%s'\n", s);
1855 ret = -errno;
1856 goto out_free;
1857 }
1858 *ctl_fd = fd;
1859 *ctl_fd_close = true;
1860
1861 if (p && *++p) {
1862 /* O_RDWR | O_NONBLOCK means the other end need not be open */
1863 fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
1864 if (fd < 0) {
1865 pr_err("Failed to open '%s'\n", p);
1866 ret = -errno;
1867 goto out_free;
1868 }
1869 *ctl_fd_ack = fd;
1870 }
1871
1872out_free:
1873 free(s);
1874 return ret;
1875}
1876
1877int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
1878{
1879 char *comma = NULL, *endptr = NULL;
1880
1881 *ctl_fd_close = false;
1882
1883 if (strncmp(str, "fd:", 3))
1884 return evlist__parse_control_fifo(str, ctl_fd, ctl_fd_ack, ctl_fd_close);
1885
1886 *ctl_fd = strtoul(&str[3], &endptr, 0);
1887 if (endptr == &str[3])
1888 return -EINVAL;
1889
1890 comma = strchr(str, ',');
1891 if (comma) {
1892 if (endptr != comma)
1893 return -EINVAL;
1894
1895 *ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
1896 if (endptr == comma + 1 || *endptr != '\0')
1897 return -EINVAL;
1898 }
1899
1900 return 0;
1901}
1902
1903void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close)
1904{
1905 if (*ctl_fd_close) {
1906 *ctl_fd_close = false;
1907 close(ctl_fd);
1908 if (ctl_fd_ack >= 0)
1909 close(ctl_fd_ack);
1910 }
1911}
1912
1913int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
1914{
1915 if (fd == -1) {
1916 pr_debug("Control descriptor is not initialized\n");
1917 return 0;
1918 }
1919
1920 evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
1921 fdarray_flag__nonfilterable |
1922 fdarray_flag__non_perf_event);
1923 if (evlist->ctl_fd.pos < 0) {
1924 evlist->ctl_fd.pos = -1;
1925 pr_err("Failed to add ctl fd entry: %m\n");
1926 return -1;
1927 }
1928
1929 evlist->ctl_fd.fd = fd;
1930 evlist->ctl_fd.ack = ack;
1931
1932 return 0;
1933}
1934
1935bool evlist__ctlfd_initialized(struct evlist *evlist)
1936{
1937 return evlist->ctl_fd.pos >= 0;
1938}
1939
1940int evlist__finalize_ctlfd(struct evlist *evlist)
1941{
1942 struct pollfd *entries = evlist->core.pollfd.entries;
1943
1944 if (!evlist__ctlfd_initialized(evlist))
1945 return 0;
1946
1947 entries[evlist->ctl_fd.pos].fd = -1;
1948 entries[evlist->ctl_fd.pos].events = 0;
1949 entries[evlist->ctl_fd.pos].revents = 0;
1950
1951 evlist->ctl_fd.pos = -1;
1952 evlist->ctl_fd.ack = -1;
1953 evlist->ctl_fd.fd = -1;
1954
1955 return 0;
1956}
1957
1958static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
1959 char *cmd_data, size_t data_size)
1960{
1961 int err;
1962 char c;
1963 size_t bytes_read = 0;
1964
1965 *cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1966 memset(cmd_data, 0, data_size);
1967 data_size--;
1968
1969 do {
1970 err = read(evlist->ctl_fd.fd, &c, 1);
1971 if (err > 0) {
1972 if (c == '\n' || c == '\0')
1973 break;
1974 cmd_data[bytes_read++] = c;
1975 if (bytes_read == data_size)
1976 break;
1977 continue;
1978 } else if (err == -1) {
1979 if (errno == EINTR)
1980 continue;
1981 if (errno == EAGAIN || errno == EWOULDBLOCK)
1982 err = 0;
1983 else
1984 pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
1985 }
1986 break;
1987 } while (1);
1988
1989 pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
1990 bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
1991
1992 if (bytes_read > 0) {
1993 if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
1994 (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
1995 *cmd = EVLIST_CTL_CMD_ENABLE;
1996 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
1997 (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) {
1998 *cmd = EVLIST_CTL_CMD_DISABLE;
1999 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_SNAPSHOT_TAG,
2000 (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
2001 *cmd = EVLIST_CTL_CMD_SNAPSHOT;
2002 pr_debug("is snapshot\n");
2003 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG,
2004 (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) {
2005 *cmd = EVLIST_CTL_CMD_EVLIST;
2006 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG,
2007 (sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) {
2008 *cmd = EVLIST_CTL_CMD_STOP;
2009 } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_PING_TAG,
2010 (sizeof(EVLIST_CTL_CMD_PING_TAG)-1))) {
2011 *cmd = EVLIST_CTL_CMD_PING;
2012 }
2013 }
2014
2015 return bytes_read ? (int)bytes_read : err;
2016}
2017
2018int evlist__ctlfd_ack(struct evlist *evlist)
2019{
2020 int err;
2021
2022 if (evlist->ctl_fd.ack == -1)
2023 return 0;
2024
2025 err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG,
2026 sizeof(EVLIST_CTL_CMD_ACK_TAG));
2027 if (err == -1)
2028 pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack);
2029
2030 return err;
2031}
2032
2033static int get_cmd_arg(char *cmd_data, size_t cmd_size, char **arg)
2034{
2035 char *data = cmd_data + cmd_size;
2036
2037 /* no argument */
2038 if (!*data)
2039 return 0;
2040
2041 /* there's argument */
2042 if (*data == ' ') {
2043 *arg = data + 1;
2044 return 1;
2045 }
2046
2047 /* malformed */
2048 return -1;
2049}
2050
2051static int evlist__ctlfd_enable(struct evlist *evlist, char *cmd_data, bool enable)
2052{
2053 struct evsel *evsel;
2054 char *name;
2055 int err;
2056
2057 err = get_cmd_arg(cmd_data,
2058 enable ? sizeof(EVLIST_CTL_CMD_ENABLE_TAG) - 1 :
2059 sizeof(EVLIST_CTL_CMD_DISABLE_TAG) - 1,
2060 &name);
2061 if (err < 0) {
2062 pr_info("failed: wrong command\n");
2063 return -1;
2064 }
2065
2066 if (err) {
2067 evsel = evlist__find_evsel_by_str(evlist, name);
2068 if (evsel) {
2069 if (enable)
2070 evlist__enable_evsel(evlist, name);
2071 else
2072 evlist__disable_evsel(evlist, name);
2073 pr_info("Event %s %s\n", evsel->name,
2074 enable ? "enabled" : "disabled");
2075 } else {
2076 pr_info("failed: can't find '%s' event\n", name);
2077 }
2078 } else {
2079 if (enable) {
2080 evlist__enable(evlist);
2081 pr_info(EVLIST_ENABLED_MSG);
2082 } else {
2083 evlist__disable(evlist);
2084 pr_info(EVLIST_DISABLED_MSG);
2085 }
2086 }
2087
2088 return 0;
2089}
2090
2091static int evlist__ctlfd_list(struct evlist *evlist, char *cmd_data)
2092{
2093 struct perf_attr_details details = { .verbose = false, };
2094 struct evsel *evsel;
2095 char *arg;
2096 int err;
2097
2098 err = get_cmd_arg(cmd_data,
2099 sizeof(EVLIST_CTL_CMD_EVLIST_TAG) - 1,
2100 &arg);
2101 if (err < 0) {
2102 pr_info("failed: wrong command\n");
2103 return -1;
2104 }
2105
2106 if (err) {
2107 if (!strcmp(arg, "-v")) {
2108 details.verbose = true;
2109 } else if (!strcmp(arg, "-g")) {
2110 details.event_group = true;
2111 } else if (!strcmp(arg, "-F")) {
2112 details.freq = true;
2113 } else {
2114 pr_info("failed: wrong command\n");
2115 return -1;
2116 }
2117 }
2118
2119 evlist__for_each_entry(evlist, evsel)
2120 evsel__fprintf(evsel, &details, stderr);
2121
2122 return 0;
2123}
2124
2125int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
2126{
2127 int err = 0;
2128 char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
2129 int ctlfd_pos = evlist->ctl_fd.pos;
2130 struct pollfd *entries = evlist->core.pollfd.entries;
2131
2132 if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
2133 return 0;
2134
2135 if (entries[ctlfd_pos].revents & POLLIN) {
2136 err = evlist__ctlfd_recv(evlist, cmd, cmd_data,
2137 EVLIST_CTL_CMD_MAX_LEN);
2138 if (err > 0) {
2139 switch (*cmd) {
2140 case EVLIST_CTL_CMD_ENABLE:
2141 case EVLIST_CTL_CMD_DISABLE:
2142 err = evlist__ctlfd_enable(evlist, cmd_data,
2143 *cmd == EVLIST_CTL_CMD_ENABLE);
2144 break;
2145 case EVLIST_CTL_CMD_EVLIST:
2146 err = evlist__ctlfd_list(evlist, cmd_data);
2147 break;
2148 case EVLIST_CTL_CMD_SNAPSHOT:
2149 case EVLIST_CTL_CMD_STOP:
2150 case EVLIST_CTL_CMD_PING:
2151 break;
2152 case EVLIST_CTL_CMD_ACK:
2153 case EVLIST_CTL_CMD_UNSUPPORTED:
2154 default:
2155 pr_debug("ctlfd: unsupported %d\n", *cmd);
2156 break;
2157 }
2158 if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED ||
2159 *cmd == EVLIST_CTL_CMD_SNAPSHOT))
2160 evlist__ctlfd_ack(evlist);
2161 }
2162 }
2163
2164 if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR))
2165 evlist__finalize_ctlfd(evlist);
2166 else
2167 entries[ctlfd_pos].revents = 0;
2168
2169 return err;
2170}
2171
2172/**
2173 * struct event_enable_time - perf record -D/--delay single time range.
2174 * @start: start of time range to enable events in milliseconds
2175 * @end: end of time range to enable events in milliseconds
2176 *
2177 * N.B. this structure is also accessed as an array of int.
2178 */
2179struct event_enable_time {
2180 int start;
2181 int end;
2182};
2183
2184static int parse_event_enable_time(const char *str, struct event_enable_time *range, bool first)
2185{
2186 const char *fmt = first ? "%u - %u %n" : " , %u - %u %n";
2187 int ret, start, end, n;
2188
2189 ret = sscanf(str, fmt, &start, &end, &n);
2190 if (ret != 2 || end <= start)
2191 return -EINVAL;
2192 if (range) {
2193 range->start = start;
2194 range->end = end;
2195 }
2196 return n;
2197}
2198
2199static ssize_t parse_event_enable_times(const char *str, struct event_enable_time *range)
2200{
2201 int incr = !!range;
2202 bool first = true;
2203 ssize_t ret, cnt;
2204
2205 for (cnt = 0; *str; cnt++) {
2206 ret = parse_event_enable_time(str, range, first);
2207 if (ret < 0)
2208 return ret;
2209 /* Check no overlap */
2210 if (!first && range && range->start <= range[-1].end)
2211 return -EINVAL;
2212 str += ret;
2213 range += incr;
2214 first = false;
2215 }
2216 return cnt;
2217}
2218
2219/**
2220 * struct event_enable_timer - control structure for perf record -D/--delay.
2221 * @evlist: event list
2222 * @times: time ranges that events are enabled (N.B. this is also accessed as an
2223 * array of int)
2224 * @times_cnt: number of time ranges
2225 * @timerfd: timer file descriptor
2226 * @pollfd_pos: position in @evlist array of file descriptors to poll (fdarray)
2227 * @times_step: current position in (int *)@times)[],
2228 * refer event_enable_timer__process()
2229 *
2230 * Note, this structure is only used when there are time ranges, not when there
2231 * is only an initial delay.
2232 */
2233struct event_enable_timer {
2234 struct evlist *evlist;
2235 struct event_enable_time *times;
2236 size_t times_cnt;
2237 int timerfd;
2238 int pollfd_pos;
2239 size_t times_step;
2240};
2241
2242static int str_to_delay(const char *str)
2243{
2244 char *endptr;
2245 long d;
2246
2247 d = strtol(str, &endptr, 10);
2248 if (*endptr || d > INT_MAX || d < -1)
2249 return 0;
2250 return d;
2251}
2252
2253int evlist__parse_event_enable_time(struct evlist *evlist, struct record_opts *opts,
2254 const char *str, int unset)
2255{
2256 enum fdarray_flags flags = fdarray_flag__nonfilterable | fdarray_flag__non_perf_event;
2257 struct event_enable_timer *eet;
2258 ssize_t times_cnt;
2259 ssize_t ret;
2260 int err;
2261
2262 if (unset)
2263 return 0;
2264
2265 opts->initial_delay = str_to_delay(str);
2266 if (opts->initial_delay)
2267 return 0;
2268
2269 ret = parse_event_enable_times(str, NULL);
2270 if (ret < 0)
2271 return ret;
2272
2273 times_cnt = ret;
2274 if (times_cnt == 0)
2275 return -EINVAL;
2276
2277 eet = zalloc(sizeof(*eet));
2278 if (!eet)
2279 return -ENOMEM;
2280
2281 eet->times = calloc(times_cnt, sizeof(*eet->times));
2282 if (!eet->times) {
2283 err = -ENOMEM;
2284 goto free_eet;
2285 }
2286
2287 if (parse_event_enable_times(str, eet->times) != times_cnt) {
2288 err = -EINVAL;
2289 goto free_eet_times;
2290 }
2291
2292 eet->times_cnt = times_cnt;
2293
2294 eet->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
2295 if (eet->timerfd == -1) {
2296 err = -errno;
2297 pr_err("timerfd_create failed: %s\n", strerror(errno));
2298 goto free_eet_times;
2299 }
2300
2301 eet->pollfd_pos = perf_evlist__add_pollfd(&evlist->core, eet->timerfd, NULL, POLLIN, flags);
2302 if (eet->pollfd_pos < 0) {
2303 err = eet->pollfd_pos;
2304 goto close_timerfd;
2305 }
2306
2307 eet->evlist = evlist;
2308 evlist->eet = eet;
2309 opts->initial_delay = eet->times[0].start;
2310
2311 return 0;
2312
2313close_timerfd:
2314 close(eet->timerfd);
2315free_eet_times:
2316 free(eet->times);
2317free_eet:
2318 free(eet);
2319 return err;
2320}
2321
2322static int event_enable_timer__set_timer(struct event_enable_timer *eet, int ms)
2323{
2324 struct itimerspec its = {
2325 .it_value.tv_sec = ms / MSEC_PER_SEC,
2326 .it_value.tv_nsec = (ms % MSEC_PER_SEC) * NSEC_PER_MSEC,
2327 };
2328 int err = 0;
2329
2330 if (timerfd_settime(eet->timerfd, 0, &its, NULL) < 0) {
2331 err = -errno;
2332 pr_err("timerfd_settime failed: %s\n", strerror(errno));
2333 }
2334 return err;
2335}
2336
2337int event_enable_timer__start(struct event_enable_timer *eet)
2338{
2339 int ms;
2340
2341 if (!eet)
2342 return 0;
2343
2344 ms = eet->times[0].end - eet->times[0].start;
2345 eet->times_step = 1;
2346
2347 return event_enable_timer__set_timer(eet, ms);
2348}
2349
2350int event_enable_timer__process(struct event_enable_timer *eet)
2351{
2352 struct pollfd *entries;
2353 short revents;
2354
2355 if (!eet)
2356 return 0;
2357
2358 entries = eet->evlist->core.pollfd.entries;
2359 revents = entries[eet->pollfd_pos].revents;
2360 entries[eet->pollfd_pos].revents = 0;
2361
2362 if (revents & POLLIN) {
2363 size_t step = eet->times_step;
2364 size_t pos = step / 2;
2365
2366 if (step & 1) {
2367 evlist__disable_non_dummy(eet->evlist);
2368 pr_info(EVLIST_DISABLED_MSG);
2369 if (pos >= eet->times_cnt - 1) {
2370 /* Disarm timer */
2371 event_enable_timer__set_timer(eet, 0);
2372 return 1; /* Stop */
2373 }
2374 } else {
2375 evlist__enable_non_dummy(eet->evlist);
2376 pr_info(EVLIST_ENABLED_MSG);
2377 }
2378
2379 step += 1;
2380 pos = step / 2;
2381
2382 if (pos < eet->times_cnt) {
2383 int *times = (int *)eet->times; /* Accessing 'times' as array of int */
2384 int ms = times[step] - times[step - 1];
2385
2386 eet->times_step = step;
2387 return event_enable_timer__set_timer(eet, ms);
2388 }
2389 }
2390
2391 return 0;
2392}
2393
2394void event_enable_timer__exit(struct event_enable_timer **ep)
2395{
2396 if (!ep || !*ep)
2397 return;
2398 free((*ep)->times);
2399 zfree(ep);
2400}
2401
2402struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
2403{
2404 struct evsel *evsel;
2405
2406 evlist__for_each_entry(evlist, evsel) {
2407 if (evsel->core.idx == idx)
2408 return evsel;
2409 }
2410 return NULL;
2411}
2412
2413int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf)
2414{
2415 struct evsel *evsel;
2416 int printed = 0;
2417
2418 evlist__for_each_entry(evlist, evsel) {
2419 if (evsel__is_dummy_event(evsel))
2420 continue;
2421 if (size > (strlen(evsel__name(evsel)) + (printed ? 2 : 1))) {
2422 printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "," : "", evsel__name(evsel));
2423 } else {
2424 printed += scnprintf(bf + printed, size - printed, "%s...", printed ? "," : "");
2425 break;
2426 }
2427 }
2428
2429 return printed;
2430}
2431
2432void evlist__check_mem_load_aux(struct evlist *evlist)
2433{
2434 struct evsel *leader, *evsel, *pos;
2435
2436 /*
2437 * For some platforms, the 'mem-loads' event is required to use
2438 * together with 'mem-loads-aux' within a group and 'mem-loads-aux'
2439 * must be the group leader. Now we disable this group before reporting
2440 * because 'mem-loads-aux' is just an auxiliary event. It doesn't carry
2441 * any valid memory load information.
2442 */
2443 evlist__for_each_entry(evlist, evsel) {
2444 leader = evsel__leader(evsel);
2445 if (leader == evsel)
2446 continue;
2447
2448 if (leader->name && strstr(leader->name, "mem-loads-aux")) {
2449 for_each_group_evsel(pos, leader) {
2450 evsel__set_leader(pos, pos);
2451 pos->core.nr_members = 0;
2452 }
2453 }
2454 }
2455}