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1// SPDX-License-Identifier: GPL-2.0
2#include <perf/evlist.h>
3#include <perf/evsel.h>
4#include <linux/bitops.h>
5#include <linux/list.h>
6#include <linux/hash.h>
7#include <sys/ioctl.h>
8#include <internal/evlist.h>
9#include <internal/evsel.h>
10#include <internal/xyarray.h>
11#include <internal/mmap.h>
12#include <internal/cpumap.h>
13#include <internal/threadmap.h>
14#include <internal/lib.h>
15#include <linux/zalloc.h>
16#include <stdlib.h>
17#include <errno.h>
18#include <unistd.h>
19#include <fcntl.h>
20#include <signal.h>
21#include <poll.h>
22#include <sys/mman.h>
23#include <perf/cpumap.h>
24#include <perf/threadmap.h>
25#include <api/fd/array.h>
26#include "internal.h"
27
28void perf_evlist__init(struct perf_evlist *evlist)
29{
30 INIT_LIST_HEAD(&evlist->entries);
31 evlist->nr_entries = 0;
32 fdarray__init(&evlist->pollfd, 64);
33 perf_evlist__reset_id_hash(evlist);
34}
35
36static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
37 struct perf_evsel *evsel)
38{
39 if (evsel->system_wide) {
40 /* System wide: set the cpu map of the evsel to all online CPUs. */
41 perf_cpu_map__put(evsel->cpus);
42 evsel->cpus = perf_cpu_map__new_online_cpus();
43 } else if (evlist->has_user_cpus && evsel->is_pmu_core) {
44 /*
45 * User requested CPUs on a core PMU, ensure the requested CPUs
46 * are valid by intersecting with those of the PMU.
47 */
48 perf_cpu_map__put(evsel->cpus);
49 evsel->cpus = perf_cpu_map__intersect(evlist->user_requested_cpus, evsel->own_cpus);
50
51 /*
52 * Empty cpu lists would eventually get opened as "any" so remove
53 * genuinely empty ones before they're opened in the wrong place.
54 */
55 if (perf_cpu_map__is_empty(evsel->cpus)) {
56 struct perf_evsel *next = perf_evlist__next(evlist, evsel);
57
58 perf_evlist__remove(evlist, evsel);
59 /* Keep idx contiguous */
60 if (next)
61 list_for_each_entry_from(next, &evlist->entries, node)
62 next->idx--;
63 }
64 } else if (!evsel->own_cpus || evlist->has_user_cpus ||
65 (!evsel->requires_cpu && perf_cpu_map__has_any_cpu(evlist->user_requested_cpus))) {
66 /*
67 * The PMU didn't specify a default cpu map, this isn't a core
68 * event and the user requested CPUs or the evlist user
69 * requested CPUs have the "any CPU" (aka dummy) CPU value. In
70 * which case use the user requested CPUs rather than the PMU
71 * ones.
72 */
73 perf_cpu_map__put(evsel->cpus);
74 evsel->cpus = perf_cpu_map__get(evlist->user_requested_cpus);
75 } else if (evsel->cpus != evsel->own_cpus) {
76 /*
77 * No user requested cpu map but the PMU cpu map doesn't match
78 * the evsel's. Reset it back to the PMU cpu map.
79 */
80 perf_cpu_map__put(evsel->cpus);
81 evsel->cpus = perf_cpu_map__get(evsel->own_cpus);
82 }
83
84 if (evsel->system_wide) {
85 perf_thread_map__put(evsel->threads);
86 evsel->threads = perf_thread_map__new_dummy();
87 } else {
88 perf_thread_map__put(evsel->threads);
89 evsel->threads = perf_thread_map__get(evlist->threads);
90 }
91
92 evlist->all_cpus = perf_cpu_map__merge(evlist->all_cpus, evsel->cpus);
93}
94
95static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
96{
97 struct perf_evsel *evsel, *n;
98
99 evlist->needs_map_propagation = true;
100
101 list_for_each_entry_safe(evsel, n, &evlist->entries, node)
102 __perf_evlist__propagate_maps(evlist, evsel);
103}
104
105void perf_evlist__add(struct perf_evlist *evlist,
106 struct perf_evsel *evsel)
107{
108 evsel->idx = evlist->nr_entries;
109 list_add_tail(&evsel->node, &evlist->entries);
110 evlist->nr_entries += 1;
111
112 if (evlist->needs_map_propagation)
113 __perf_evlist__propagate_maps(evlist, evsel);
114}
115
116void perf_evlist__remove(struct perf_evlist *evlist,
117 struct perf_evsel *evsel)
118{
119 list_del_init(&evsel->node);
120 evlist->nr_entries -= 1;
121}
122
123struct perf_evlist *perf_evlist__new(void)
124{
125 struct perf_evlist *evlist = zalloc(sizeof(*evlist));
126
127 if (evlist != NULL)
128 perf_evlist__init(evlist);
129
130 return evlist;
131}
132
133struct perf_evsel *
134perf_evlist__next(struct perf_evlist *evlist, struct perf_evsel *prev)
135{
136 struct perf_evsel *next;
137
138 if (!prev) {
139 next = list_first_entry(&evlist->entries,
140 struct perf_evsel,
141 node);
142 } else {
143 next = list_next_entry(prev, node);
144 }
145
146 /* Empty list is noticed here so don't need checking on entry. */
147 if (&next->node == &evlist->entries)
148 return NULL;
149
150 return next;
151}
152
153static void perf_evlist__purge(struct perf_evlist *evlist)
154{
155 struct perf_evsel *pos, *n;
156
157 perf_evlist__for_each_entry_safe(evlist, n, pos) {
158 list_del_init(&pos->node);
159 perf_evsel__delete(pos);
160 }
161
162 evlist->nr_entries = 0;
163}
164
165void perf_evlist__exit(struct perf_evlist *evlist)
166{
167 perf_cpu_map__put(evlist->user_requested_cpus);
168 perf_cpu_map__put(evlist->all_cpus);
169 perf_thread_map__put(evlist->threads);
170 evlist->user_requested_cpus = NULL;
171 evlist->all_cpus = NULL;
172 evlist->threads = NULL;
173 fdarray__exit(&evlist->pollfd);
174}
175
176void perf_evlist__delete(struct perf_evlist *evlist)
177{
178 if (evlist == NULL)
179 return;
180
181 perf_evlist__munmap(evlist);
182 perf_evlist__close(evlist);
183 perf_evlist__purge(evlist);
184 perf_evlist__exit(evlist);
185 free(evlist);
186}
187
188void perf_evlist__set_maps(struct perf_evlist *evlist,
189 struct perf_cpu_map *cpus,
190 struct perf_thread_map *threads)
191{
192 /*
193 * Allow for the possibility that one or another of the maps isn't being
194 * changed i.e. don't put it. Note we are assuming the maps that are
195 * being applied are brand new and evlist is taking ownership of the
196 * original reference count of 1. If that is not the case it is up to
197 * the caller to increase the reference count.
198 */
199 if (cpus != evlist->user_requested_cpus) {
200 perf_cpu_map__put(evlist->user_requested_cpus);
201 evlist->user_requested_cpus = perf_cpu_map__get(cpus);
202 }
203
204 if (threads != evlist->threads) {
205 perf_thread_map__put(evlist->threads);
206 evlist->threads = perf_thread_map__get(threads);
207 }
208
209 perf_evlist__propagate_maps(evlist);
210}
211
212int perf_evlist__open(struct perf_evlist *evlist)
213{
214 struct perf_evsel *evsel;
215 int err;
216
217 perf_evlist__for_each_entry(evlist, evsel) {
218 err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
219 if (err < 0)
220 goto out_err;
221 }
222
223 return 0;
224
225out_err:
226 perf_evlist__close(evlist);
227 return err;
228}
229
230void perf_evlist__close(struct perf_evlist *evlist)
231{
232 struct perf_evsel *evsel;
233
234 perf_evlist__for_each_entry_reverse(evlist, evsel)
235 perf_evsel__close(evsel);
236}
237
238void perf_evlist__enable(struct perf_evlist *evlist)
239{
240 struct perf_evsel *evsel;
241
242 perf_evlist__for_each_entry(evlist, evsel)
243 perf_evsel__enable(evsel);
244}
245
246void perf_evlist__disable(struct perf_evlist *evlist)
247{
248 struct perf_evsel *evsel;
249
250 perf_evlist__for_each_entry(evlist, evsel)
251 perf_evsel__disable(evsel);
252}
253
254u64 perf_evlist__read_format(struct perf_evlist *evlist)
255{
256 struct perf_evsel *first = perf_evlist__first(evlist);
257
258 return first->attr.read_format;
259}
260
261#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
262
263static void perf_evlist__id_hash(struct perf_evlist *evlist,
264 struct perf_evsel *evsel,
265 int cpu_map_idx, int thread, u64 id)
266{
267 int hash;
268 struct perf_sample_id *sid = SID(evsel, cpu_map_idx, thread);
269
270 sid->id = id;
271 sid->evsel = evsel;
272 hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
273 hlist_add_head(&sid->node, &evlist->heads[hash]);
274}
275
276void perf_evlist__reset_id_hash(struct perf_evlist *evlist)
277{
278 int i;
279
280 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
281 INIT_HLIST_HEAD(&evlist->heads[i]);
282}
283
284void perf_evlist__id_add(struct perf_evlist *evlist,
285 struct perf_evsel *evsel,
286 int cpu_map_idx, int thread, u64 id)
287{
288 if (!SID(evsel, cpu_map_idx, thread))
289 return;
290
291 perf_evlist__id_hash(evlist, evsel, cpu_map_idx, thread, id);
292 evsel->id[evsel->ids++] = id;
293}
294
295int perf_evlist__id_add_fd(struct perf_evlist *evlist,
296 struct perf_evsel *evsel,
297 int cpu_map_idx, int thread, int fd)
298{
299 u64 read_data[4] = { 0, };
300 int id_idx = 1; /* The first entry is the counter value */
301 u64 id;
302 int ret;
303
304 if (!SID(evsel, cpu_map_idx, thread))
305 return -1;
306
307 ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
308 if (!ret)
309 goto add;
310
311 if (errno != ENOTTY)
312 return -1;
313
314 /* Legacy way to get event id.. All hail to old kernels! */
315
316 /*
317 * This way does not work with group format read, so bail
318 * out in that case.
319 */
320 if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
321 return -1;
322
323 if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
324 read(fd, &read_data, sizeof(read_data)) == -1)
325 return -1;
326
327 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
328 ++id_idx;
329 if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
330 ++id_idx;
331
332 id = read_data[id_idx];
333
334add:
335 perf_evlist__id_add(evlist, evsel, cpu_map_idx, thread, id);
336 return 0;
337}
338
339int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
340{
341 int nr_cpus = perf_cpu_map__nr(evlist->all_cpus);
342 int nr_threads = perf_thread_map__nr(evlist->threads);
343 int nfds = 0;
344 struct perf_evsel *evsel;
345
346 perf_evlist__for_each_entry(evlist, evsel) {
347 if (evsel->system_wide)
348 nfds += nr_cpus;
349 else
350 nfds += nr_cpus * nr_threads;
351 }
352
353 if (fdarray__available_entries(&evlist->pollfd) < nfds &&
354 fdarray__grow(&evlist->pollfd, nfds) < 0)
355 return -ENOMEM;
356
357 return 0;
358}
359
360int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
361 void *ptr, short revent, enum fdarray_flags flags)
362{
363 int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP, flags);
364
365 if (pos >= 0) {
366 evlist->pollfd.priv[pos].ptr = ptr;
367 fcntl(fd, F_SETFL, O_NONBLOCK);
368 }
369
370 return pos;
371}
372
373static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
374 void *arg __maybe_unused)
375{
376 struct perf_mmap *map = fda->priv[fd].ptr;
377
378 if (map)
379 perf_mmap__put(map);
380}
381
382int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
383{
384 return fdarray__filter(&evlist->pollfd, revents_and_mask,
385 perf_evlist__munmap_filtered, NULL);
386}
387
388int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
389{
390 return fdarray__poll(&evlist->pollfd, timeout);
391}
392
393static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, bool overwrite)
394{
395 int i;
396 struct perf_mmap *map;
397
398 map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
399 if (!map)
400 return NULL;
401
402 for (i = 0; i < evlist->nr_mmaps; i++) {
403 struct perf_mmap *prev = i ? &map[i - 1] : NULL;
404
405 /*
406 * When the perf_mmap() call is made we grab one refcount, plus
407 * one extra to let perf_mmap__consume() get the last
408 * events after all real references (perf_mmap__get()) are
409 * dropped.
410 *
411 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
412 * thus does perf_mmap__get() on it.
413 */
414 perf_mmap__init(&map[i], prev, overwrite, NULL);
415 }
416
417 return map;
418}
419
420static void perf_evsel__set_sid_idx(struct perf_evsel *evsel, int idx, int cpu, int thread)
421{
422 struct perf_sample_id *sid = SID(evsel, cpu, thread);
423
424 sid->idx = idx;
425 sid->cpu = perf_cpu_map__cpu(evsel->cpus, cpu);
426 sid->tid = perf_thread_map__pid(evsel->threads, thread);
427}
428
429static struct perf_mmap*
430perf_evlist__mmap_cb_get(struct perf_evlist *evlist, bool overwrite, int idx)
431{
432 struct perf_mmap *maps;
433
434 maps = overwrite ? evlist->mmap_ovw : evlist->mmap;
435
436 if (!maps) {
437 maps = perf_evlist__alloc_mmap(evlist, overwrite);
438 if (!maps)
439 return NULL;
440
441 if (overwrite)
442 evlist->mmap_ovw = maps;
443 else
444 evlist->mmap = maps;
445 }
446
447 return &maps[idx];
448}
449
450#define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y))
451
452static int
453perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
454 int output, struct perf_cpu cpu)
455{
456 return perf_mmap__mmap(map, mp, output, cpu);
457}
458
459static void perf_evlist__set_mmap_first(struct perf_evlist *evlist, struct perf_mmap *map,
460 bool overwrite)
461{
462 if (overwrite)
463 evlist->mmap_ovw_first = map;
464 else
465 evlist->mmap_first = map;
466}
467
468static int
469mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
470 int idx, struct perf_mmap_param *mp, int cpu_idx,
471 int thread, int *_output, int *_output_overwrite, int *nr_mmaps)
472{
473 struct perf_cpu evlist_cpu = perf_cpu_map__cpu(evlist->all_cpus, cpu_idx);
474 struct perf_evsel *evsel;
475 int revent;
476
477 perf_evlist__for_each_entry(evlist, evsel) {
478 bool overwrite = evsel->attr.write_backward;
479 enum fdarray_flags flgs;
480 struct perf_mmap *map;
481 int *output, fd, cpu;
482
483 if (evsel->system_wide && thread)
484 continue;
485
486 cpu = perf_cpu_map__idx(evsel->cpus, evlist_cpu);
487 if (cpu == -1)
488 continue;
489
490 map = ops->get(evlist, overwrite, idx);
491 if (map == NULL)
492 return -ENOMEM;
493
494 if (overwrite) {
495 mp->prot = PROT_READ;
496 output = _output_overwrite;
497 } else {
498 mp->prot = PROT_READ | PROT_WRITE;
499 output = _output;
500 }
501
502 fd = FD(evsel, cpu, thread);
503
504 if (*output == -1) {
505 *output = fd;
506
507 /*
508 * The last one will be done at perf_mmap__consume(), so that we
509 * make sure we don't prevent tools from consuming every last event in
510 * the ring buffer.
511 *
512 * I.e. we can get the POLLHUP meaning that the fd doesn't exist
513 * anymore, but the last events for it are still in the ring buffer,
514 * waiting to be consumed.
515 *
516 * Tools can chose to ignore this at their own discretion, but the
517 * evlist layer can't just drop it when filtering events in
518 * perf_evlist__filter_pollfd().
519 */
520 refcount_set(&map->refcnt, 2);
521
522 if (ops->idx)
523 ops->idx(evlist, evsel, mp, idx);
524
525 /* Debug message used by test scripts */
526 pr_debug("idx %d: mmapping fd %d\n", idx, *output);
527 if (ops->mmap(map, mp, *output, evlist_cpu) < 0)
528 return -1;
529
530 *nr_mmaps += 1;
531
532 if (!idx)
533 perf_evlist__set_mmap_first(evlist, map, overwrite);
534 } else {
535 /* Debug message used by test scripts */
536 pr_debug("idx %d: set output fd %d -> %d\n", idx, fd, *output);
537 if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
538 return -1;
539
540 perf_mmap__get(map);
541 }
542
543 revent = !overwrite ? POLLIN : 0;
544
545 flgs = evsel->system_wide ? fdarray_flag__nonfilterable : fdarray_flag__default;
546 if (perf_evlist__add_pollfd(evlist, fd, map, revent, flgs) < 0) {
547 perf_mmap__put(map);
548 return -1;
549 }
550
551 if (evsel->attr.read_format & PERF_FORMAT_ID) {
552 if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
553 fd) < 0)
554 return -1;
555 perf_evsel__set_sid_idx(evsel, idx, cpu, thread);
556 }
557 }
558
559 return 0;
560}
561
562static int
563mmap_per_thread(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
564 struct perf_mmap_param *mp)
565{
566 int nr_threads = perf_thread_map__nr(evlist->threads);
567 int nr_cpus = perf_cpu_map__nr(evlist->all_cpus);
568 int cpu, thread, idx = 0;
569 int nr_mmaps = 0;
570
571 pr_debug("%s: nr cpu values (may include -1) %d nr threads %d\n",
572 __func__, nr_cpus, nr_threads);
573
574 /* per-thread mmaps */
575 for (thread = 0; thread < nr_threads; thread++, idx++) {
576 int output = -1;
577 int output_overwrite = -1;
578
579 if (mmap_per_evsel(evlist, ops, idx, mp, 0, thread, &output,
580 &output_overwrite, &nr_mmaps))
581 goto out_unmap;
582 }
583
584 /* system-wide mmaps i.e. per-cpu */
585 for (cpu = 1; cpu < nr_cpus; cpu++, idx++) {
586 int output = -1;
587 int output_overwrite = -1;
588
589 if (mmap_per_evsel(evlist, ops, idx, mp, cpu, 0, &output,
590 &output_overwrite, &nr_mmaps))
591 goto out_unmap;
592 }
593
594 if (nr_mmaps != evlist->nr_mmaps)
595 pr_err("Miscounted nr_mmaps %d vs %d\n", nr_mmaps, evlist->nr_mmaps);
596
597 return 0;
598
599out_unmap:
600 perf_evlist__munmap(evlist);
601 return -1;
602}
603
604static int
605mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
606 struct perf_mmap_param *mp)
607{
608 int nr_threads = perf_thread_map__nr(evlist->threads);
609 int nr_cpus = perf_cpu_map__nr(evlist->all_cpus);
610 int nr_mmaps = 0;
611 int cpu, thread;
612
613 pr_debug("%s: nr cpu values %d nr threads %d\n", __func__, nr_cpus, nr_threads);
614
615 for (cpu = 0; cpu < nr_cpus; cpu++) {
616 int output = -1;
617 int output_overwrite = -1;
618
619 for (thread = 0; thread < nr_threads; thread++) {
620 if (mmap_per_evsel(evlist, ops, cpu, mp, cpu,
621 thread, &output, &output_overwrite, &nr_mmaps))
622 goto out_unmap;
623 }
624 }
625
626 if (nr_mmaps != evlist->nr_mmaps)
627 pr_err("Miscounted nr_mmaps %d vs %d\n", nr_mmaps, evlist->nr_mmaps);
628
629 return 0;
630
631out_unmap:
632 perf_evlist__munmap(evlist);
633 return -1;
634}
635
636static int perf_evlist__nr_mmaps(struct perf_evlist *evlist)
637{
638 int nr_mmaps;
639
640 /* One for each CPU */
641 nr_mmaps = perf_cpu_map__nr(evlist->all_cpus);
642 if (perf_cpu_map__has_any_cpu_or_is_empty(evlist->all_cpus)) {
643 /* Plus one for each thread */
644 nr_mmaps += perf_thread_map__nr(evlist->threads);
645 /* Minus the per-thread CPU (-1) */
646 nr_mmaps -= 1;
647 }
648
649 return nr_mmaps;
650}
651
652int perf_evlist__mmap_ops(struct perf_evlist *evlist,
653 struct perf_evlist_mmap_ops *ops,
654 struct perf_mmap_param *mp)
655{
656 const struct perf_cpu_map *cpus = evlist->all_cpus;
657 struct perf_evsel *evsel;
658
659 if (!ops || !ops->get || !ops->mmap)
660 return -EINVAL;
661
662 mp->mask = evlist->mmap_len - page_size - 1;
663
664 evlist->nr_mmaps = perf_evlist__nr_mmaps(evlist);
665
666 perf_evlist__for_each_entry(evlist, evsel) {
667 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
668 evsel->sample_id == NULL &&
669 perf_evsel__alloc_id(evsel, evsel->fd->max_x, evsel->fd->max_y) < 0)
670 return -ENOMEM;
671 }
672
673 if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
674 return -ENOMEM;
675
676 if (perf_cpu_map__has_any_cpu_or_is_empty(cpus))
677 return mmap_per_thread(evlist, ops, mp);
678
679 return mmap_per_cpu(evlist, ops, mp);
680}
681
682int perf_evlist__mmap(struct perf_evlist *evlist, int pages)
683{
684 struct perf_mmap_param mp;
685 struct perf_evlist_mmap_ops ops = {
686 .get = perf_evlist__mmap_cb_get,
687 .mmap = perf_evlist__mmap_cb_mmap,
688 };
689
690 evlist->mmap_len = (pages + 1) * page_size;
691
692 return perf_evlist__mmap_ops(evlist, &ops, &mp);
693}
694
695void perf_evlist__munmap(struct perf_evlist *evlist)
696{
697 int i;
698
699 if (evlist->mmap) {
700 for (i = 0; i < evlist->nr_mmaps; i++)
701 perf_mmap__munmap(&evlist->mmap[i]);
702 }
703
704 if (evlist->mmap_ovw) {
705 for (i = 0; i < evlist->nr_mmaps; i++)
706 perf_mmap__munmap(&evlist->mmap_ovw[i]);
707 }
708
709 zfree(&evlist->mmap);
710 zfree(&evlist->mmap_ovw);
711}
712
713struct perf_mmap*
714perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map,
715 bool overwrite)
716{
717 if (map)
718 return map->next;
719
720 return overwrite ? evlist->mmap_ovw_first : evlist->mmap_first;
721}
722
723void __perf_evlist__set_leader(struct list_head *list, struct perf_evsel *leader)
724{
725 struct perf_evsel *evsel;
726 int n = 0;
727
728 __perf_evlist__for_each_entry(list, evsel) {
729 evsel->leader = leader;
730 n++;
731 }
732 leader->nr_members = n;
733}
734
735void perf_evlist__set_leader(struct perf_evlist *evlist)
736{
737 if (evlist->nr_entries) {
738 struct perf_evsel *first = list_entry(evlist->entries.next,
739 struct perf_evsel, node);
740
741 __perf_evlist__set_leader(&evlist->entries, first);
742 }
743}
744
745int perf_evlist__nr_groups(struct perf_evlist *evlist)
746{
747 struct perf_evsel *evsel;
748 int nr_groups = 0;
749
750 perf_evlist__for_each_evsel(evlist, evsel) {
751 /*
752 * evsels by default have a nr_members of 1, and they are their
753 * own leader. If the nr_members is >1 then this is an
754 * indication of a group.
755 */
756 if (evsel->leader == evsel && evsel->nr_members > 1)
757 nr_groups++;
758 }
759 return nr_groups;
760}
761
762void perf_evlist__go_system_wide(struct perf_evlist *evlist, struct perf_evsel *evsel)
763{
764 if (!evsel->system_wide) {
765 evsel->system_wide = true;
766 if (evlist->needs_map_propagation)
767 __perf_evlist__propagate_maps(evlist, evsel);
768 }
769}