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TOMOYO Linux Cross Reference
Linux/tools/perf/util/evlist.c

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  1 /*
  2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
  3  *
  4  * Parts came from builtin-{top,stat,record}.c, see those files for further
  5  * copyright notes.
  6  *
  7  * Released under the GPL v2. (and only v2, not any later version)
  8  */
  9 #include "util.h"
 10 #include <api/fs/fs.h>
 11 #include <errno.h>
 12 #include <inttypes.h>
 13 #include <poll.h>
 14 #include "cpumap.h"
 15 #include "thread_map.h"
 16 #include "target.h"
 17 #include "evlist.h"
 18 #include "evsel.h"
 19 #include "debug.h"
 20 #include "units.h"
 21 #include "asm/bug.h"
 22 #include "bpf-event.h"
 23 #include <signal.h>
 24 #include <unistd.h>
 25 
 26 #include "parse-events.h"
 27 #include <subcmd/parse-options.h>
 28 
 29 #include <fcntl.h>
 30 #include <sys/ioctl.h>
 31 #include <sys/mman.h>
 32 
 33 #include <linux/bitops.h>
 34 #include <linux/hash.h>
 35 #include <linux/log2.h>
 36 #include <linux/err.h>
 37 
 38 #ifdef LACKS_SIGQUEUE_PROTOTYPE
 39 int sigqueue(pid_t pid, int sig, const union sigval value);
 40 #endif
 41 
 42 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
 43 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
 44 
 45 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
 46                        struct thread_map *threads)
 47 {
 48         int i;
 49 
 50         for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
 51                 INIT_HLIST_HEAD(&evlist->heads[i]);
 52         INIT_LIST_HEAD(&evlist->entries);
 53         perf_evlist__set_maps(evlist, cpus, threads);
 54         fdarray__init(&evlist->pollfd, 64);
 55         evlist->workload.pid = -1;
 56         evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
 57 }
 58 
 59 struct perf_evlist *perf_evlist__new(void)
 60 {
 61         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
 62 
 63         if (evlist != NULL)
 64                 perf_evlist__init(evlist, NULL, NULL);
 65 
 66         return evlist;
 67 }
 68 
 69 struct perf_evlist *perf_evlist__new_default(void)
 70 {
 71         struct perf_evlist *evlist = perf_evlist__new();
 72 
 73         if (evlist && perf_evlist__add_default(evlist)) {
 74                 perf_evlist__delete(evlist);
 75                 evlist = NULL;
 76         }
 77 
 78         return evlist;
 79 }
 80 
 81 struct perf_evlist *perf_evlist__new_dummy(void)
 82 {
 83         struct perf_evlist *evlist = perf_evlist__new();
 84 
 85         if (evlist && perf_evlist__add_dummy(evlist)) {
 86                 perf_evlist__delete(evlist);
 87                 evlist = NULL;
 88         }
 89 
 90         return evlist;
 91 }
 92 
 93 /**
 94  * perf_evlist__set_id_pos - set the positions of event ids.
 95  * @evlist: selected event list
 96  *
 97  * Events with compatible sample types all have the same id_pos
 98  * and is_pos.  For convenience, put a copy on evlist.
 99  */
100 void perf_evlist__set_id_pos(struct perf_evlist *evlist)
101 {
102         struct perf_evsel *first = perf_evlist__first(evlist);
103 
104         evlist->id_pos = first->id_pos;
105         evlist->is_pos = first->is_pos;
106 }
107 
108 static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
109 {
110         struct perf_evsel *evsel;
111 
112         evlist__for_each_entry(evlist, evsel)
113                 perf_evsel__calc_id_pos(evsel);
114 
115         perf_evlist__set_id_pos(evlist);
116 }
117 
118 static void perf_evlist__purge(struct perf_evlist *evlist)
119 {
120         struct perf_evsel *pos, *n;
121 
122         evlist__for_each_entry_safe(evlist, n, pos) {
123                 list_del_init(&pos->node);
124                 pos->evlist = NULL;
125                 perf_evsel__delete(pos);
126         }
127 
128         evlist->nr_entries = 0;
129 }
130 
131 void perf_evlist__exit(struct perf_evlist *evlist)
132 {
133         zfree(&evlist->mmap);
134         zfree(&evlist->overwrite_mmap);
135         fdarray__exit(&evlist->pollfd);
136 }
137 
138 void perf_evlist__delete(struct perf_evlist *evlist)
139 {
140         if (evlist == NULL)
141                 return;
142 
143         perf_evlist__munmap(evlist);
144         perf_evlist__close(evlist);
145         cpu_map__put(evlist->cpus);
146         thread_map__put(evlist->threads);
147         evlist->cpus = NULL;
148         evlist->threads = NULL;
149         perf_evlist__purge(evlist);
150         perf_evlist__exit(evlist);
151         free(evlist);
152 }
153 
154 static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
155                                           struct perf_evsel *evsel)
156 {
157         /*
158          * We already have cpus for evsel (via PMU sysfs) so
159          * keep it, if there's no target cpu list defined.
160          */
161         if (!evsel->own_cpus || evlist->has_user_cpus) {
162                 cpu_map__put(evsel->cpus);
163                 evsel->cpus = cpu_map__get(evlist->cpus);
164         } else if (evsel->cpus != evsel->own_cpus) {
165                 cpu_map__put(evsel->cpus);
166                 evsel->cpus = cpu_map__get(evsel->own_cpus);
167         }
168 
169         thread_map__put(evsel->threads);
170         evsel->threads = thread_map__get(evlist->threads);
171 }
172 
173 static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
174 {
175         struct perf_evsel *evsel;
176 
177         evlist__for_each_entry(evlist, evsel)
178                 __perf_evlist__propagate_maps(evlist, evsel);
179 }
180 
181 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
182 {
183         entry->evlist = evlist;
184         list_add_tail(&entry->node, &evlist->entries);
185         entry->idx = evlist->nr_entries;
186         entry->tracking = !entry->idx;
187 
188         if (!evlist->nr_entries++)
189                 perf_evlist__set_id_pos(evlist);
190 
191         __perf_evlist__propagate_maps(evlist, entry);
192 }
193 
194 void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
195 {
196         evsel->evlist = NULL;
197         list_del_init(&evsel->node);
198         evlist->nr_entries -= 1;
199 }
200 
201 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
202                                    struct list_head *list)
203 {
204         struct perf_evsel *evsel, *temp;
205 
206         __evlist__for_each_entry_safe(list, temp, evsel) {
207                 list_del_init(&evsel->node);
208                 perf_evlist__add(evlist, evsel);
209         }
210 }
211 
212 void __perf_evlist__set_leader(struct list_head *list)
213 {
214         struct perf_evsel *evsel, *leader;
215 
216         leader = list_entry(list->next, struct perf_evsel, node);
217         evsel = list_entry(list->prev, struct perf_evsel, node);
218 
219         leader->nr_members = evsel->idx - leader->idx + 1;
220 
221         __evlist__for_each_entry(list, evsel) {
222                 evsel->leader = leader;
223         }
224 }
225 
226 void perf_evlist__set_leader(struct perf_evlist *evlist)
227 {
228         if (evlist->nr_entries) {
229                 evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
230                 __perf_evlist__set_leader(&evlist->entries);
231         }
232 }
233 
234 int __perf_evlist__add_default(struct perf_evlist *evlist, bool precise)
235 {
236         struct perf_evsel *evsel = perf_evsel__new_cycles(precise);
237 
238         if (evsel == NULL)
239                 return -ENOMEM;
240 
241         perf_evlist__add(evlist, evsel);
242         return 0;
243 }
244 
245 int perf_evlist__add_dummy(struct perf_evlist *evlist)
246 {
247         struct perf_event_attr attr = {
248                 .type   = PERF_TYPE_SOFTWARE,
249                 .config = PERF_COUNT_SW_DUMMY,
250                 .size   = sizeof(attr), /* to capture ABI version */
251         };
252         struct perf_evsel *evsel = perf_evsel__new_idx(&attr, evlist->nr_entries);
253 
254         if (evsel == NULL)
255                 return -ENOMEM;
256 
257         perf_evlist__add(evlist, evsel);
258         return 0;
259 }
260 
261 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
262                                   struct perf_event_attr *attrs, size_t nr_attrs)
263 {
264         struct perf_evsel *evsel, *n;
265         LIST_HEAD(head);
266         size_t i;
267 
268         for (i = 0; i < nr_attrs; i++) {
269                 evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
270                 if (evsel == NULL)
271                         goto out_delete_partial_list;
272                 list_add_tail(&evsel->node, &head);
273         }
274 
275         perf_evlist__splice_list_tail(evlist, &head);
276 
277         return 0;
278 
279 out_delete_partial_list:
280         __evlist__for_each_entry_safe(&head, n, evsel)
281                 perf_evsel__delete(evsel);
282         return -1;
283 }
284 
285 int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
286                                      struct perf_event_attr *attrs, size_t nr_attrs)
287 {
288         size_t i;
289 
290         for (i = 0; i < nr_attrs; i++)
291                 event_attr_init(attrs + i);
292 
293         return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
294 }
295 
296 struct perf_evsel *
297 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
298 {
299         struct perf_evsel *evsel;
300 
301         evlist__for_each_entry(evlist, evsel) {
302                 if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
303                     (int)evsel->attr.config == id)
304                         return evsel;
305         }
306 
307         return NULL;
308 }
309 
310 struct perf_evsel *
311 perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
312                                      const char *name)
313 {
314         struct perf_evsel *evsel;
315 
316         evlist__for_each_entry(evlist, evsel) {
317                 if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
318                     (strcmp(evsel->name, name) == 0))
319                         return evsel;
320         }
321 
322         return NULL;
323 }
324 
325 int perf_evlist__add_newtp(struct perf_evlist *evlist,
326                            const char *sys, const char *name, void *handler)
327 {
328         struct perf_evsel *evsel = perf_evsel__newtp(sys, name);
329 
330         if (IS_ERR(evsel))
331                 return -1;
332 
333         evsel->handler = handler;
334         perf_evlist__add(evlist, evsel);
335         return 0;
336 }
337 
338 static int perf_evlist__nr_threads(struct perf_evlist *evlist,
339                                    struct perf_evsel *evsel)
340 {
341         if (evsel->system_wide)
342                 return 1;
343         else
344                 return thread_map__nr(evlist->threads);
345 }
346 
347 void perf_evlist__disable(struct perf_evlist *evlist)
348 {
349         struct perf_evsel *pos;
350 
351         evlist__for_each_entry(evlist, pos) {
352                 if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->fd)
353                         continue;
354                 perf_evsel__disable(pos);
355         }
356 
357         evlist->enabled = false;
358 }
359 
360 void perf_evlist__enable(struct perf_evlist *evlist)
361 {
362         struct perf_evsel *pos;
363 
364         evlist__for_each_entry(evlist, pos) {
365                 if (!perf_evsel__is_group_leader(pos) || !pos->fd)
366                         continue;
367                 perf_evsel__enable(pos);
368         }
369 
370         evlist->enabled = true;
371 }
372 
373 void perf_evlist__toggle_enable(struct perf_evlist *evlist)
374 {
375         (evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist);
376 }
377 
378 static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
379                                          struct perf_evsel *evsel, int cpu)
380 {
381         int thread;
382         int nr_threads = perf_evlist__nr_threads(evlist, evsel);
383 
384         if (!evsel->fd)
385                 return -EINVAL;
386 
387         for (thread = 0; thread < nr_threads; thread++) {
388                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
389                 if (err)
390                         return err;
391         }
392         return 0;
393 }
394 
395 static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
396                                             struct perf_evsel *evsel,
397                                             int thread)
398 {
399         int cpu;
400         int nr_cpus = cpu_map__nr(evlist->cpus);
401 
402         if (!evsel->fd)
403                 return -EINVAL;
404 
405         for (cpu = 0; cpu < nr_cpus; cpu++) {
406                 int err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
407                 if (err)
408                         return err;
409         }
410         return 0;
411 }
412 
413 int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
414                                   struct perf_evsel *evsel, int idx)
415 {
416         bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
417 
418         if (per_cpu_mmaps)
419                 return perf_evlist__enable_event_cpu(evlist, evsel, idx);
420         else
421                 return perf_evlist__enable_event_thread(evlist, evsel, idx);
422 }
423 
424 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
425 {
426         int nr_cpus = cpu_map__nr(evlist->cpus);
427         int nr_threads = thread_map__nr(evlist->threads);
428         int nfds = 0;
429         struct perf_evsel *evsel;
430 
431         evlist__for_each_entry(evlist, evsel) {
432                 if (evsel->system_wide)
433                         nfds += nr_cpus;
434                 else
435                         nfds += nr_cpus * nr_threads;
436         }
437 
438         if (fdarray__available_entries(&evlist->pollfd) < nfds &&
439             fdarray__grow(&evlist->pollfd, nfds) < 0)
440                 return -ENOMEM;
441 
442         return 0;
443 }
444 
445 static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
446                                      struct perf_mmap *map, short revent)
447 {
448         int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
449         /*
450          * Save the idx so that when we filter out fds POLLHUP'ed we can
451          * close the associated evlist->mmap[] entry.
452          */
453         if (pos >= 0) {
454                 evlist->pollfd.priv[pos].ptr = map;
455 
456                 fcntl(fd, F_SETFL, O_NONBLOCK);
457         }
458 
459         return pos;
460 }
461 
462 int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
463 {
464         return __perf_evlist__add_pollfd(evlist, fd, NULL, POLLIN);
465 }
466 
467 static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
468                                          void *arg __maybe_unused)
469 {
470         struct perf_mmap *map = fda->priv[fd].ptr;
471 
472         if (map)
473                 perf_mmap__put(map);
474 }
475 
476 int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
477 {
478         return fdarray__filter(&evlist->pollfd, revents_and_mask,
479                                perf_evlist__munmap_filtered, NULL);
480 }
481 
482 int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
483 {
484         return fdarray__poll(&evlist->pollfd, timeout);
485 }
486 
487 static void perf_evlist__id_hash(struct perf_evlist *evlist,
488                                  struct perf_evsel *evsel,
489                                  int cpu, int thread, u64 id)
490 {
491         int hash;
492         struct perf_sample_id *sid = SID(evsel, cpu, thread);
493 
494         sid->id = id;
495         sid->evsel = evsel;
496         hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
497         hlist_add_head(&sid->node, &evlist->heads[hash]);
498 }
499 
500 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
501                          int cpu, int thread, u64 id)
502 {
503         perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
504         evsel->id[evsel->ids++] = id;
505 }
506 
507 int perf_evlist__id_add_fd(struct perf_evlist *evlist,
508                            struct perf_evsel *evsel,
509                            int cpu, int thread, int fd)
510 {
511         u64 read_data[4] = { 0, };
512         int id_idx = 1; /* The first entry is the counter value */
513         u64 id;
514         int ret;
515 
516         ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
517         if (!ret)
518                 goto add;
519 
520         if (errno != ENOTTY)
521                 return -1;
522 
523         /* Legacy way to get event id.. All hail to old kernels! */
524 
525         /*
526          * This way does not work with group format read, so bail
527          * out in that case.
528          */
529         if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
530                 return -1;
531 
532         if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
533             read(fd, &read_data, sizeof(read_data)) == -1)
534                 return -1;
535 
536         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
537                 ++id_idx;
538         if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
539                 ++id_idx;
540 
541         id = read_data[id_idx];
542 
543  add:
544         perf_evlist__id_add(evlist, evsel, cpu, thread, id);
545         return 0;
546 }
547 
548 static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
549                                      struct perf_evsel *evsel, int idx, int cpu,
550                                      int thread)
551 {
552         struct perf_sample_id *sid = SID(evsel, cpu, thread);
553         sid->idx = idx;
554         if (evlist->cpus && cpu >= 0)
555                 sid->cpu = evlist->cpus->map[cpu];
556         else
557                 sid->cpu = -1;
558         if (!evsel->system_wide && evlist->threads && thread >= 0)
559                 sid->tid = thread_map__pid(evlist->threads, thread);
560         else
561                 sid->tid = -1;
562 }
563 
564 struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
565 {
566         struct hlist_head *head;
567         struct perf_sample_id *sid;
568         int hash;
569 
570         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
571         head = &evlist->heads[hash];
572 
573         hlist_for_each_entry(sid, head, node)
574                 if (sid->id == id)
575                         return sid;
576 
577         return NULL;
578 }
579 
580 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
581 {
582         struct perf_sample_id *sid;
583 
584         if (evlist->nr_entries == 1 || !id)
585                 return perf_evlist__first(evlist);
586 
587         sid = perf_evlist__id2sid(evlist, id);
588         if (sid)
589                 return sid->evsel;
590 
591         if (!perf_evlist__sample_id_all(evlist))
592                 return perf_evlist__first(evlist);
593 
594         return NULL;
595 }
596 
597 struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
598                                                 u64 id)
599 {
600         struct perf_sample_id *sid;
601 
602         if (!id)
603                 return NULL;
604 
605         sid = perf_evlist__id2sid(evlist, id);
606         if (sid)
607                 return sid->evsel;
608 
609         return NULL;
610 }
611 
612 static int perf_evlist__event2id(struct perf_evlist *evlist,
613                                  union perf_event *event, u64 *id)
614 {
615         const u64 *array = event->sample.array;
616         ssize_t n;
617 
618         n = (event->header.size - sizeof(event->header)) >> 3;
619 
620         if (event->header.type == PERF_RECORD_SAMPLE) {
621                 if (evlist->id_pos >= n)
622                         return -1;
623                 *id = array[evlist->id_pos];
624         } else {
625                 if (evlist->is_pos > n)
626                         return -1;
627                 n -= evlist->is_pos;
628                 *id = array[n];
629         }
630         return 0;
631 }
632 
633 struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
634                                             union perf_event *event)
635 {
636         struct perf_evsel *first = perf_evlist__first(evlist);
637         struct hlist_head *head;
638         struct perf_sample_id *sid;
639         int hash;
640         u64 id;
641 
642         if (evlist->nr_entries == 1)
643                 return first;
644 
645         if (!first->attr.sample_id_all &&
646             event->header.type != PERF_RECORD_SAMPLE)
647                 return first;
648 
649         if (perf_evlist__event2id(evlist, event, &id))
650                 return NULL;
651 
652         /* Synthesized events have an id of zero */
653         if (!id)
654                 return first;
655 
656         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
657         head = &evlist->heads[hash];
658 
659         hlist_for_each_entry(sid, head, node) {
660                 if (sid->id == id)
661                         return sid->evsel;
662         }
663         return NULL;
664 }
665 
666 static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
667 {
668         int i;
669 
670         if (!evlist->overwrite_mmap)
671                 return 0;
672 
673         for (i = 0; i < evlist->nr_mmaps; i++) {
674                 int fd = evlist->overwrite_mmap[i].fd;
675                 int err;
676 
677                 if (fd < 0)
678                         continue;
679                 err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
680                 if (err)
681                         return err;
682         }
683         return 0;
684 }
685 
686 static int perf_evlist__pause(struct perf_evlist *evlist)
687 {
688         return perf_evlist__set_paused(evlist, true);
689 }
690 
691 static int perf_evlist__resume(struct perf_evlist *evlist)
692 {
693         return perf_evlist__set_paused(evlist, false);
694 }
695 
696 static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
697 {
698         int i;
699 
700         if (evlist->mmap)
701                 for (i = 0; i < evlist->nr_mmaps; i++)
702                         perf_mmap__munmap(&evlist->mmap[i]);
703 
704         if (evlist->overwrite_mmap)
705                 for (i = 0; i < evlist->nr_mmaps; i++)
706                         perf_mmap__munmap(&evlist->overwrite_mmap[i]);
707 }
708 
709 void perf_evlist__munmap(struct perf_evlist *evlist)
710 {
711         perf_evlist__munmap_nofree(evlist);
712         zfree(&evlist->mmap);
713         zfree(&evlist->overwrite_mmap);
714 }
715 
716 static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist,
717                                                  bool overwrite)
718 {
719         int i;
720         struct perf_mmap *map;
721 
722         evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
723         if (cpu_map__empty(evlist->cpus))
724                 evlist->nr_mmaps = thread_map__nr(evlist->threads);
725         map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
726         if (!map)
727                 return NULL;
728 
729         for (i = 0; i < evlist->nr_mmaps; i++) {
730                 map[i].fd = -1;
731                 map[i].overwrite = overwrite;
732                 /*
733                  * When the perf_mmap() call is made we grab one refcount, plus
734                  * one extra to let perf_mmap__consume() get the last
735                  * events after all real references (perf_mmap__get()) are
736                  * dropped.
737                  *
738                  * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
739                  * thus does perf_mmap__get() on it.
740                  */
741                 refcount_set(&map[i].refcnt, 0);
742         }
743         return map;
744 }
745 
746 static bool
747 perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
748                          struct perf_evsel *evsel)
749 {
750         if (evsel->attr.write_backward)
751                 return false;
752         return true;
753 }
754 
755 static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
756                                        struct mmap_params *mp, int cpu_idx,
757                                        int thread, int *_output, int *_output_overwrite)
758 {
759         struct perf_evsel *evsel;
760         int revent;
761         int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
762 
763         evlist__for_each_entry(evlist, evsel) {
764                 struct perf_mmap *maps = evlist->mmap;
765                 int *output = _output;
766                 int fd;
767                 int cpu;
768 
769                 mp->prot = PROT_READ | PROT_WRITE;
770                 if (evsel->attr.write_backward) {
771                         output = _output_overwrite;
772                         maps = evlist->overwrite_mmap;
773 
774                         if (!maps) {
775                                 maps = perf_evlist__alloc_mmap(evlist, true);
776                                 if (!maps)
777                                         return -1;
778                                 evlist->overwrite_mmap = maps;
779                                 if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
780                                         perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
781                         }
782                         mp->prot &= ~PROT_WRITE;
783                 }
784 
785                 if (evsel->system_wide && thread)
786                         continue;
787 
788                 cpu = cpu_map__idx(evsel->cpus, evlist_cpu);
789                 if (cpu == -1)
790                         continue;
791 
792                 fd = FD(evsel, cpu, thread);
793 
794                 if (*output == -1) {
795                         *output = fd;
796 
797                         if (perf_mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
798                                 return -1;
799                 } else {
800                         if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
801                                 return -1;
802 
803                         perf_mmap__get(&maps[idx]);
804                 }
805 
806                 revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
807 
808                 /*
809                  * The system_wide flag causes a selected event to be opened
810                  * always without a pid.  Consequently it will never get a
811                  * POLLHUP, but it is used for tracking in combination with
812                  * other events, so it should not need to be polled anyway.
813                  * Therefore don't add it for polling.
814                  */
815                 if (!evsel->system_wide &&
816                     __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
817                         perf_mmap__put(&maps[idx]);
818                         return -1;
819                 }
820 
821                 if (evsel->attr.read_format & PERF_FORMAT_ID) {
822                         if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
823                                                    fd) < 0)
824                                 return -1;
825                         perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
826                                                  thread);
827                 }
828         }
829 
830         return 0;
831 }
832 
833 static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
834                                      struct mmap_params *mp)
835 {
836         int cpu, thread;
837         int nr_cpus = cpu_map__nr(evlist->cpus);
838         int nr_threads = thread_map__nr(evlist->threads);
839 
840         pr_debug2("perf event ring buffer mmapped per cpu\n");
841         for (cpu = 0; cpu < nr_cpus; cpu++) {
842                 int output = -1;
843                 int output_overwrite = -1;
844 
845                 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
846                                               true);
847 
848                 for (thread = 0; thread < nr_threads; thread++) {
849                         if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
850                                                         thread, &output, &output_overwrite))
851                                 goto out_unmap;
852                 }
853         }
854 
855         return 0;
856 
857 out_unmap:
858         perf_evlist__munmap_nofree(evlist);
859         return -1;
860 }
861 
862 static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
863                                         struct mmap_params *mp)
864 {
865         int thread;
866         int nr_threads = thread_map__nr(evlist->threads);
867 
868         pr_debug2("perf event ring buffer mmapped per thread\n");
869         for (thread = 0; thread < nr_threads; thread++) {
870                 int output = -1;
871                 int output_overwrite = -1;
872 
873                 auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
874                                               false);
875 
876                 if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
877                                                 &output, &output_overwrite))
878                         goto out_unmap;
879         }
880 
881         return 0;
882 
883 out_unmap:
884         perf_evlist__munmap_nofree(evlist);
885         return -1;
886 }
887 
888 unsigned long perf_event_mlock_kb_in_pages(void)
889 {
890         unsigned long pages;
891         int max;
892 
893         if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
894                 /*
895                  * Pick a once upon a time good value, i.e. things look
896                  * strange since we can't read a sysctl value, but lets not
897                  * die yet...
898                  */
899                 max = 512;
900         } else {
901                 max -= (page_size / 1024);
902         }
903 
904         pages = (max * 1024) / page_size;
905         if (!is_power_of_2(pages))
906                 pages = rounddown_pow_of_two(pages);
907 
908         return pages;
909 }
910 
911 size_t perf_evlist__mmap_size(unsigned long pages)
912 {
913         if (pages == UINT_MAX)
914                 pages = perf_event_mlock_kb_in_pages();
915         else if (!is_power_of_2(pages))
916                 return 0;
917 
918         return (pages + 1) * page_size;
919 }
920 
921 static long parse_pages_arg(const char *str, unsigned long min,
922                             unsigned long max)
923 {
924         unsigned long pages, val;
925         static struct parse_tag tags[] = {
926                 { .tag  = 'B', .mult = 1       },
927                 { .tag  = 'K', .mult = 1 << 10 },
928                 { .tag  = 'M', .mult = 1 << 20 },
929                 { .tag  = 'G', .mult = 1 << 30 },
930                 { .tag  = 0 },
931         };
932 
933         if (str == NULL)
934                 return -EINVAL;
935 
936         val = parse_tag_value(str, tags);
937         if (val != (unsigned long) -1) {
938                 /* we got file size value */
939                 pages = PERF_ALIGN(val, page_size) / page_size;
940         } else {
941                 /* we got pages count value */
942                 char *eptr;
943                 pages = strtoul(str, &eptr, 10);
944                 if (*eptr != '\0')
945                         return -EINVAL;
946         }
947 
948         if (pages == 0 && min == 0) {
949                 /* leave number of pages at 0 */
950         } else if (!is_power_of_2(pages)) {
951                 char buf[100];
952 
953                 /* round pages up to next power of 2 */
954                 pages = roundup_pow_of_two(pages);
955                 if (!pages)
956                         return -EINVAL;
957 
958                 unit_number__scnprintf(buf, sizeof(buf), pages * page_size);
959                 pr_info("rounding mmap pages size to %s (%lu pages)\n",
960                         buf, pages);
961         }
962 
963         if (pages > max)
964                 return -EINVAL;
965 
966         return pages;
967 }
968 
969 int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
970 {
971         unsigned long max = UINT_MAX;
972         long pages;
973 
974         if (max > SIZE_MAX / page_size)
975                 max = SIZE_MAX / page_size;
976 
977         pages = parse_pages_arg(str, 1, max);
978         if (pages < 0) {
979                 pr_err("Invalid argument for --mmap_pages/-m\n");
980                 return -1;
981         }
982 
983         *mmap_pages = pages;
984         return 0;
985 }
986 
987 int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
988                                   int unset __maybe_unused)
989 {
990         return __perf_evlist__parse_mmap_pages(opt->value, str);
991 }
992 
993 /**
994  * perf_evlist__mmap_ex - Create mmaps to receive events.
995  * @evlist: list of events
996  * @pages: map length in pages
997  * @overwrite: overwrite older events?
998  * @auxtrace_pages - auxtrace map length in pages
999  * @auxtrace_overwrite - overwrite older auxtrace data?
1000  *
1001  * If @overwrite is %false the user needs to signal event consumption using
1002  * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
1003  * automatically.
1004  *
1005  * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
1006  * consumption using auxtrace_mmap__write_tail().
1007  *
1008  * Return: %0 on success, negative error code otherwise.
1009  */
1010 int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
1011                          unsigned int auxtrace_pages,
1012                          bool auxtrace_overwrite, int nr_cblocks, int affinity)
1013 {
1014         struct perf_evsel *evsel;
1015         const struct cpu_map *cpus = evlist->cpus;
1016         const struct thread_map *threads = evlist->threads;
1017         /*
1018          * Delay setting mp.prot: set it before calling perf_mmap__mmap.
1019          * Its value is decided by evsel's write_backward.
1020          * So &mp should not be passed through const pointer.
1021          */
1022         struct mmap_params mp = { .nr_cblocks = nr_cblocks, .affinity = affinity };
1023 
1024         if (!evlist->mmap)
1025                 evlist->mmap = perf_evlist__alloc_mmap(evlist, false);
1026         if (!evlist->mmap)
1027                 return -ENOMEM;
1028 
1029         if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
1030                 return -ENOMEM;
1031 
1032         evlist->mmap_len = perf_evlist__mmap_size(pages);
1033         pr_debug("mmap size %zuB\n", evlist->mmap_len);
1034         mp.mask = evlist->mmap_len - page_size - 1;
1035 
1036         auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
1037                                    auxtrace_pages, auxtrace_overwrite);
1038 
1039         evlist__for_each_entry(evlist, evsel) {
1040                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
1041                     evsel->sample_id == NULL &&
1042                     perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
1043                         return -ENOMEM;
1044         }
1045 
1046         if (cpu_map__empty(cpus))
1047                 return perf_evlist__mmap_per_thread(evlist, &mp);
1048 
1049         return perf_evlist__mmap_per_cpu(evlist, &mp);
1050 }
1051 
1052 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
1053 {
1054         return perf_evlist__mmap_ex(evlist, pages, 0, false, 0, PERF_AFFINITY_SYS);
1055 }
1056 
1057 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
1058 {
1059         bool all_threads = (target->per_thread && target->system_wide);
1060         struct cpu_map *cpus;
1061         struct thread_map *threads;
1062 
1063         /*
1064          * If specify '-a' and '--per-thread' to perf record, perf record
1065          * will override '--per-thread'. target->per_thread = false and
1066          * target->system_wide = true.
1067          *
1068          * If specify '--per-thread' only to perf record,
1069          * target->per_thread = true and target->system_wide = false.
1070          *
1071          * So target->per_thread && target->system_wide is false.
1072          * For perf record, thread_map__new_str doesn't call
1073          * thread_map__new_all_cpus. That will keep perf record's
1074          * current behavior.
1075          *
1076          * For perf stat, it allows the case that target->per_thread and
1077          * target->system_wide are all true. It means to collect system-wide
1078          * per-thread data. thread_map__new_str will call
1079          * thread_map__new_all_cpus to enumerate all threads.
1080          */
1081         threads = thread_map__new_str(target->pid, target->tid, target->uid,
1082                                       all_threads);
1083 
1084         if (!threads)
1085                 return -1;
1086 
1087         if (target__uses_dummy_map(target))
1088                 cpus = cpu_map__dummy_new();
1089         else
1090                 cpus = cpu_map__new(target->cpu_list);
1091 
1092         if (!cpus)
1093                 goto out_delete_threads;
1094 
1095         evlist->has_user_cpus = !!target->cpu_list;
1096 
1097         perf_evlist__set_maps(evlist, cpus, threads);
1098 
1099         return 0;
1100 
1101 out_delete_threads:
1102         thread_map__put(threads);
1103         return -1;
1104 }
1105 
1106 void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
1107                            struct thread_map *threads)
1108 {
1109         /*
1110          * Allow for the possibility that one or another of the maps isn't being
1111          * changed i.e. don't put it.  Note we are assuming the maps that are
1112          * being applied are brand new and evlist is taking ownership of the
1113          * original reference count of 1.  If that is not the case it is up to
1114          * the caller to increase the reference count.
1115          */
1116         if (cpus != evlist->cpus) {
1117                 cpu_map__put(evlist->cpus);
1118                 evlist->cpus = cpu_map__get(cpus);
1119         }
1120 
1121         if (threads != evlist->threads) {
1122                 thread_map__put(evlist->threads);
1123                 evlist->threads = thread_map__get(threads);
1124         }
1125 
1126         perf_evlist__propagate_maps(evlist);
1127 }
1128 
1129 void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
1130                                    enum perf_event_sample_format bit)
1131 {
1132         struct perf_evsel *evsel;
1133 
1134         evlist__for_each_entry(evlist, evsel)
1135                 __perf_evsel__set_sample_bit(evsel, bit);
1136 }
1137 
1138 void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
1139                                      enum perf_event_sample_format bit)
1140 {
1141         struct perf_evsel *evsel;
1142 
1143         evlist__for_each_entry(evlist, evsel)
1144                 __perf_evsel__reset_sample_bit(evsel, bit);
1145 }
1146 
1147 int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
1148 {
1149         struct perf_evsel *evsel;
1150         int err = 0;
1151 
1152         evlist__for_each_entry(evlist, evsel) {
1153                 if (evsel->filter == NULL)
1154                         continue;
1155 
1156                 /*
1157                  * filters only work for tracepoint event, which doesn't have cpu limit.
1158                  * So evlist and evsel should always be same.
1159                  */
1160                 err = perf_evsel__apply_filter(evsel, evsel->filter);
1161                 if (err) {
1162                         *err_evsel = evsel;
1163                         break;
1164                 }
1165         }
1166 
1167         return err;
1168 }
1169 
1170 int perf_evlist__set_tp_filter(struct perf_evlist *evlist, const char *filter)
1171 {
1172         struct perf_evsel *evsel;
1173         int err = 0;
1174 
1175         evlist__for_each_entry(evlist, evsel) {
1176                 if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
1177                         continue;
1178 
1179                 err = perf_evsel__set_filter(evsel, filter);
1180                 if (err)
1181                         break;
1182         }
1183 
1184         return err;
1185 }
1186 
1187 int perf_evlist__set_tp_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids)
1188 {
1189         char *filter;
1190         int ret = -1;
1191         size_t i;
1192 
1193         for (i = 0; i < npids; ++i) {
1194                 if (i == 0) {
1195                         if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
1196                                 return -1;
1197                 } else {
1198                         char *tmp;
1199 
1200                         if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
1201                                 goto out_free;
1202 
1203                         free(filter);
1204                         filter = tmp;
1205                 }
1206         }
1207 
1208         ret = perf_evlist__set_tp_filter(evlist, filter);
1209 out_free:
1210         free(filter);
1211         return ret;
1212 }
1213 
1214 int perf_evlist__set_tp_filter_pid(struct perf_evlist *evlist, pid_t pid)
1215 {
1216         return perf_evlist__set_tp_filter_pids(evlist, 1, &pid);
1217 }
1218 
1219 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
1220 {
1221         struct perf_evsel *pos;
1222 
1223         if (evlist->nr_entries == 1)
1224                 return true;
1225 
1226         if (evlist->id_pos < 0 || evlist->is_pos < 0)
1227                 return false;
1228 
1229         evlist__for_each_entry(evlist, pos) {
1230                 if (pos->id_pos != evlist->id_pos ||
1231                     pos->is_pos != evlist->is_pos)
1232                         return false;
1233         }
1234 
1235         return true;
1236 }
1237 
1238 u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1239 {
1240         struct perf_evsel *evsel;
1241 
1242         if (evlist->combined_sample_type)
1243                 return evlist->combined_sample_type;
1244 
1245         evlist__for_each_entry(evlist, evsel)
1246                 evlist->combined_sample_type |= evsel->attr.sample_type;
1247 
1248         return evlist->combined_sample_type;
1249 }
1250 
1251 u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
1252 {
1253         evlist->combined_sample_type = 0;
1254         return __perf_evlist__combined_sample_type(evlist);
1255 }
1256 
1257 u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist)
1258 {
1259         struct perf_evsel *evsel;
1260         u64 branch_type = 0;
1261 
1262         evlist__for_each_entry(evlist, evsel)
1263                 branch_type |= evsel->attr.branch_sample_type;
1264         return branch_type;
1265 }
1266 
1267 bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
1268 {
1269         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1270         u64 read_format = first->attr.read_format;
1271         u64 sample_type = first->attr.sample_type;
1272 
1273         evlist__for_each_entry(evlist, pos) {
1274                 if (read_format != pos->attr.read_format)
1275                         return false;
1276         }
1277 
1278         /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
1279         if ((sample_type & PERF_SAMPLE_READ) &&
1280             !(read_format & PERF_FORMAT_ID)) {
1281                 return false;
1282         }
1283 
1284         return true;
1285 }
1286 
1287 u64 perf_evlist__read_format(struct perf_evlist *evlist)
1288 {
1289         struct perf_evsel *first = perf_evlist__first(evlist);
1290         return first->attr.read_format;
1291 }
1292 
1293 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
1294 {
1295         struct perf_evsel *first = perf_evlist__first(evlist);
1296         struct perf_sample *data;
1297         u64 sample_type;
1298         u16 size = 0;
1299 
1300         if (!first->attr.sample_id_all)
1301                 goto out;
1302 
1303         sample_type = first->attr.sample_type;
1304 
1305         if (sample_type & PERF_SAMPLE_TID)
1306                 size += sizeof(data->tid) * 2;
1307 
1308        if (sample_type & PERF_SAMPLE_TIME)
1309                 size += sizeof(data->time);
1310 
1311         if (sample_type & PERF_SAMPLE_ID)
1312                 size += sizeof(data->id);
1313 
1314         if (sample_type & PERF_SAMPLE_STREAM_ID)
1315                 size += sizeof(data->stream_id);
1316 
1317         if (sample_type & PERF_SAMPLE_CPU)
1318                 size += sizeof(data->cpu) * 2;
1319 
1320         if (sample_type & PERF_SAMPLE_IDENTIFIER)
1321                 size += sizeof(data->id);
1322 out:
1323         return size;
1324 }
1325 
1326 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
1327 {
1328         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
1329 
1330         evlist__for_each_entry_continue(evlist, pos) {
1331                 if (first->attr.sample_id_all != pos->attr.sample_id_all)
1332                         return false;
1333         }
1334 
1335         return true;
1336 }
1337 
1338 bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
1339 {
1340         struct perf_evsel *first = perf_evlist__first(evlist);
1341         return first->attr.sample_id_all;
1342 }
1343 
1344 void perf_evlist__set_selected(struct perf_evlist *evlist,
1345                                struct perf_evsel *evsel)
1346 {
1347         evlist->selected = evsel;
1348 }
1349 
1350 void perf_evlist__close(struct perf_evlist *evlist)
1351 {
1352         struct perf_evsel *evsel;
1353 
1354         evlist__for_each_entry_reverse(evlist, evsel)
1355                 perf_evsel__close(evsel);
1356 }
1357 
1358 static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
1359 {
1360         struct cpu_map    *cpus;
1361         struct thread_map *threads;
1362         int err = -ENOMEM;
1363 
1364         /*
1365          * Try reading /sys/devices/system/cpu/online to get
1366          * an all cpus map.
1367          *
1368          * FIXME: -ENOMEM is the best we can do here, the cpu_map
1369          * code needs an overhaul to properly forward the
1370          * error, and we may not want to do that fallback to a
1371          * default cpu identity map :-\
1372          */
1373         cpus = cpu_map__new(NULL);
1374         if (!cpus)
1375                 goto out;
1376 
1377         threads = thread_map__new_dummy();
1378         if (!threads)
1379                 goto out_put;
1380 
1381         perf_evlist__set_maps(evlist, cpus, threads);
1382 out:
1383         return err;
1384 out_put:
1385         cpu_map__put(cpus);
1386         goto out;
1387 }
1388 
1389 int perf_evlist__open(struct perf_evlist *evlist)
1390 {
1391         struct perf_evsel *evsel;
1392         int err;
1393 
1394         /*
1395          * Default: one fd per CPU, all threads, aka systemwide
1396          * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
1397          */
1398         if (evlist->threads == NULL && evlist->cpus == NULL) {
1399                 err = perf_evlist__create_syswide_maps(evlist);
1400                 if (err < 0)
1401                         goto out_err;
1402         }
1403 
1404         perf_evlist__update_id_pos(evlist);
1405 
1406         evlist__for_each_entry(evlist, evsel) {
1407                 err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
1408                 if (err < 0)
1409                         goto out_err;
1410         }
1411 
1412         return 0;
1413 out_err:
1414         perf_evlist__close(evlist);
1415         errno = -err;
1416         return err;
1417 }
1418 
1419 int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
1420                                   const char *argv[], bool pipe_output,
1421                                   void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
1422 {
1423         int child_ready_pipe[2], go_pipe[2];
1424         char bf;
1425 
1426         if (pipe(child_ready_pipe) < 0) {
1427                 perror("failed to create 'ready' pipe");
1428                 return -1;
1429         }
1430 
1431         if (pipe(go_pipe) < 0) {
1432                 perror("failed to create 'go' pipe");
1433                 goto out_close_ready_pipe;
1434         }
1435 
1436         evlist->workload.pid = fork();
1437         if (evlist->workload.pid < 0) {
1438                 perror("failed to fork");
1439                 goto out_close_pipes;
1440         }
1441 
1442         if (!evlist->workload.pid) {
1443                 int ret;
1444 
1445                 if (pipe_output)
1446                         dup2(2, 1);
1447 
1448                 signal(SIGTERM, SIG_DFL);
1449 
1450                 close(child_ready_pipe[0]);
1451                 close(go_pipe[1]);
1452                 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
1453 
1454                 /*
1455                  * Tell the parent we're ready to go
1456                  */
1457                 close(child_ready_pipe[1]);
1458 
1459                 /*
1460                  * Wait until the parent tells us to go.
1461                  */
1462                 ret = read(go_pipe[0], &bf, 1);
1463                 /*
1464                  * The parent will ask for the execvp() to be performed by
1465                  * writing exactly one byte, in workload.cork_fd, usually via
1466                  * perf_evlist__start_workload().
1467                  *
1468                  * For cancelling the workload without actually running it,
1469                  * the parent will just close workload.cork_fd, without writing
1470                  * anything, i.e. read will return zero and we just exit()
1471                  * here.
1472                  */
1473                 if (ret != 1) {
1474                         if (ret == -1)
1475                                 perror("unable to read pipe");
1476                         exit(ret);
1477                 }
1478 
1479                 execvp(argv[0], (char **)argv);
1480 
1481                 if (exec_error) {
1482                         union sigval val;
1483 
1484                         val.sival_int = errno;
1485                         if (sigqueue(getppid(), SIGUSR1, val))
1486                                 perror(argv[0]);
1487                 } else
1488                         perror(argv[0]);
1489                 exit(-1);
1490         }
1491 
1492         if (exec_error) {
1493                 struct sigaction act = {
1494                         .sa_flags     = SA_SIGINFO,
1495                         .sa_sigaction = exec_error,
1496                 };
1497                 sigaction(SIGUSR1, &act, NULL);
1498         }
1499 
1500         if (target__none(target)) {
1501                 if (evlist->threads == NULL) {
1502                         fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
1503                                 __func__, __LINE__);
1504                         goto out_close_pipes;
1505                 }
1506                 thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
1507         }
1508 
1509         close(child_ready_pipe[1]);
1510         close(go_pipe[0]);
1511         /*
1512          * wait for child to settle
1513          */
1514         if (read(child_ready_pipe[0], &bf, 1) == -1) {
1515                 perror("unable to read pipe");
1516                 goto out_close_pipes;
1517         }
1518 
1519         fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
1520         evlist->workload.cork_fd = go_pipe[1];
1521         close(child_ready_pipe[0]);
1522         return 0;
1523 
1524 out_close_pipes:
1525         close(go_pipe[0]);
1526         close(go_pipe[1]);
1527 out_close_ready_pipe:
1528         close(child_ready_pipe[0]);
1529         close(child_ready_pipe[1]);
1530         return -1;
1531 }
1532 
1533 int perf_evlist__start_workload(struct perf_evlist *evlist)
1534 {
1535         if (evlist->workload.cork_fd > 0) {
1536                 char bf = 0;
1537                 int ret;
1538                 /*
1539                  * Remove the cork, let it rip!
1540                  */
1541                 ret = write(evlist->workload.cork_fd, &bf, 1);
1542                 if (ret < 0)
1543                         perror("unable to write to pipe");
1544 
1545                 close(evlist->workload.cork_fd);
1546                 return ret;
1547         }
1548 
1549         return 0;
1550 }
1551 
1552 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
1553                               struct perf_sample *sample)
1554 {
1555         struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1556 
1557         if (!evsel)
1558                 return -EFAULT;
1559         return perf_evsel__parse_sample(evsel, event, sample);
1560 }
1561 
1562 int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
1563                                         union perf_event *event,
1564                                         u64 *timestamp)
1565 {
1566         struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1567 
1568         if (!evsel)
1569                 return -EFAULT;
1570         return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
1571 }
1572 
1573 size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
1574 {
1575         struct perf_evsel *evsel;
1576         size_t printed = 0;
1577 
1578         evlist__for_each_entry(evlist, evsel) {
1579                 printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
1580                                    perf_evsel__name(evsel));
1581         }
1582 
1583         return printed + fprintf(fp, "\n");
1584 }
1585 
1586 int perf_evlist__strerror_open(struct perf_evlist *evlist,
1587                                int err, char *buf, size_t size)
1588 {
1589         int printed, value;
1590         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1591 
1592         switch (err) {
1593         case EACCES:
1594         case EPERM:
1595                 printed = scnprintf(buf, size,
1596                                     "Error:\t%s.\n"
1597                                     "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
1598 
1599                 value = perf_event_paranoid();
1600 
1601                 printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
1602 
1603                 if (value >= 2) {
1604                         printed += scnprintf(buf + printed, size - printed,
1605                                              "For your workloads it needs to be <= 1\nHint:\t");
1606                 }
1607                 printed += scnprintf(buf + printed, size - printed,
1608                                      "For system wide tracing it needs to be set to -1.\n");
1609 
1610                 printed += scnprintf(buf + printed, size - printed,
1611                                     "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
1612                                     "Hint:\tThe current value is %d.", value);
1613                 break;
1614         case EINVAL: {
1615                 struct perf_evsel *first = perf_evlist__first(evlist);
1616                 int max_freq;
1617 
1618                 if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
1619                         goto out_default;
1620 
1621                 if (first->attr.sample_freq < (u64)max_freq)
1622                         goto out_default;
1623 
1624                 printed = scnprintf(buf, size,
1625                                     "Error:\t%s.\n"
1626                                     "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
1627                                     "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
1628                                     emsg, max_freq, first->attr.sample_freq);
1629                 break;
1630         }
1631         default:
1632 out_default:
1633                 scnprintf(buf, size, "%s", emsg);
1634                 break;
1635         }
1636 
1637         return 0;
1638 }
1639 
1640 int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
1641 {
1642         char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
1643         int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
1644 
1645         switch (err) {
1646         case EPERM:
1647                 sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
1648                 printed += scnprintf(buf + printed, size - printed,
1649                                      "Error:\t%s.\n"
1650                                      "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
1651                                      "Hint:\tTried using %zd kB.\n",
1652                                      emsg, pages_max_per_user, pages_attempted);
1653 
1654                 if (pages_attempted >= pages_max_per_user) {
1655                         printed += scnprintf(buf + printed, size - printed,
1656                                              "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
1657                                              pages_max_per_user + pages_attempted);
1658                 }
1659 
1660                 printed += scnprintf(buf + printed, size - printed,
1661                                      "Hint:\tTry using a smaller -m/--mmap-pages value.");
1662                 break;
1663         default:
1664                 scnprintf(buf, size, "%s", emsg);
1665                 break;
1666         }
1667 
1668         return 0;
1669 }
1670 
1671 void perf_evlist__to_front(struct perf_evlist *evlist,
1672                            struct perf_evsel *move_evsel)
1673 {
1674         struct perf_evsel *evsel, *n;
1675         LIST_HEAD(move);
1676 
1677         if (move_evsel == perf_evlist__first(evlist))
1678                 return;
1679 
1680         evlist__for_each_entry_safe(evlist, n, evsel) {
1681                 if (evsel->leader == move_evsel->leader)
1682                         list_move_tail(&evsel->node, &move);
1683         }
1684 
1685         list_splice(&move, &evlist->entries);
1686 }
1687 
1688 void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
1689                                      struct perf_evsel *tracking_evsel)
1690 {
1691         struct perf_evsel *evsel;
1692 
1693         if (tracking_evsel->tracking)
1694                 return;
1695 
1696         evlist__for_each_entry(evlist, evsel) {
1697                 if (evsel != tracking_evsel)
1698                         evsel->tracking = false;
1699         }
1700 
1701         tracking_evsel->tracking = true;
1702 }
1703 
1704 struct perf_evsel *
1705 perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
1706                                const char *str)
1707 {
1708         struct perf_evsel *evsel;
1709 
1710         evlist__for_each_entry(evlist, evsel) {
1711                 if (!evsel->name)
1712                         continue;
1713                 if (strcmp(str, evsel->name) == 0)
1714                         return evsel;
1715         }
1716 
1717         return NULL;
1718 }
1719 
1720 void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist,
1721                                   enum bkw_mmap_state state)
1722 {
1723         enum bkw_mmap_state old_state = evlist->bkw_mmap_state;
1724         enum action {
1725                 NONE,
1726                 PAUSE,
1727                 RESUME,
1728         } action = NONE;
1729 
1730         if (!evlist->overwrite_mmap)
1731                 return;
1732 
1733         switch (old_state) {
1734         case BKW_MMAP_NOTREADY: {
1735                 if (state != BKW_MMAP_RUNNING)
1736                         goto state_err;
1737                 break;
1738         }
1739         case BKW_MMAP_RUNNING: {
1740                 if (state != BKW_MMAP_DATA_PENDING)
1741                         goto state_err;
1742                 action = PAUSE;
1743                 break;
1744         }
1745         case BKW_MMAP_DATA_PENDING: {
1746                 if (state != BKW_MMAP_EMPTY)
1747                         goto state_err;
1748                 break;
1749         }
1750         case BKW_MMAP_EMPTY: {
1751                 if (state != BKW_MMAP_RUNNING)
1752                         goto state_err;
1753                 action = RESUME;
1754                 break;
1755         }
1756         default:
1757                 WARN_ONCE(1, "Shouldn't get there\n");
1758         }
1759 
1760         evlist->bkw_mmap_state = state;
1761 
1762         switch (action) {
1763         case PAUSE:
1764                 perf_evlist__pause(evlist);
1765                 break;
1766         case RESUME:
1767                 perf_evlist__resume(evlist);
1768                 break;
1769         case NONE:
1770         default:
1771                 break;
1772         }
1773 
1774 state_err:
1775         return;
1776 }
1777 
1778 bool perf_evlist__exclude_kernel(struct perf_evlist *evlist)
1779 {
1780         struct perf_evsel *evsel;
1781 
1782         evlist__for_each_entry(evlist, evsel) {
1783                 if (!evsel->attr.exclude_kernel)
1784                         return false;
1785         }
1786 
1787         return true;
1788 }
1789 
1790 /*
1791  * Events in data file are not collect in groups, but we still want
1792  * the group display. Set the artificial group and set the leader's
1793  * forced_leader flag to notify the display code.
1794  */
1795 void perf_evlist__force_leader(struct perf_evlist *evlist)
1796 {
1797         if (!evlist->nr_groups) {
1798                 struct perf_evsel *leader = perf_evlist__first(evlist);
1799 
1800                 perf_evlist__set_leader(evlist);
1801                 leader->forced_leader = true;
1802         }
1803 }
1804 
1805 struct perf_evsel *perf_evlist__reset_weak_group(struct perf_evlist *evsel_list,
1806                                                  struct perf_evsel *evsel)
1807 {
1808         struct perf_evsel *c2, *leader;
1809         bool is_open = true;
1810 
1811         leader = evsel->leader;
1812         pr_debug("Weak group for %s/%d failed\n",
1813                         leader->name, leader->nr_members);
1814 
1815         /*
1816          * for_each_group_member doesn't work here because it doesn't
1817          * include the first entry.
1818          */
1819         evlist__for_each_entry(evsel_list, c2) {
1820                 if (c2 == evsel)
1821                         is_open = false;
1822                 if (c2->leader == leader) {
1823                         if (is_open)
1824                                 perf_evsel__close(c2);
1825                         c2->leader = c2;
1826                         c2->nr_members = 0;
1827                 }
1828         }
1829         return leader;
1830 }
1831 
1832 int perf_evlist__add_sb_event(struct perf_evlist **evlist,
1833                               struct perf_event_attr *attr,
1834                               perf_evsel__sb_cb_t cb,
1835                               void *data)
1836 {
1837         struct perf_evsel *evsel;
1838         bool new_evlist = (*evlist) == NULL;
1839 
1840         if (*evlist == NULL)
1841                 *evlist = perf_evlist__new();
1842         if (*evlist == NULL)
1843                 return -1;
1844 
1845         if (!attr->sample_id_all) {
1846                 pr_warning("enabling sample_id_all for all side band events\n");
1847                 attr->sample_id_all = 1;
1848         }
1849 
1850         evsel = perf_evsel__new_idx(attr, (*evlist)->nr_entries);
1851         if (!evsel)
1852                 goto out_err;
1853 
1854         evsel->side_band.cb = cb;
1855         evsel->side_band.data = data;
1856         perf_evlist__add(*evlist, evsel);
1857         return 0;
1858 
1859 out_err:
1860         if (new_evlist) {
1861                 perf_evlist__delete(*evlist);
1862                 *evlist = NULL;
1863         }
1864         return -1;
1865 }
1866 
1867 static void *perf_evlist__poll_thread(void *arg)
1868 {
1869         struct perf_evlist *evlist = arg;
1870         bool draining = false;
1871         int i;
1872 
1873         while (draining || !(evlist->thread.done)) {
1874                 if (draining)
1875                         draining = false;
1876                 else if (evlist->thread.done)
1877                         draining = true;
1878 
1879                 if (!draining)
1880                         perf_evlist__poll(evlist, 1000);
1881 
1882                 for (i = 0; i < evlist->nr_mmaps; i++) {
1883                         struct perf_mmap *map = &evlist->mmap[i];
1884                         union perf_event *event;
1885 
1886                         if (perf_mmap__read_init(map))
1887                                 continue;
1888                         while ((event = perf_mmap__read_event(map)) != NULL) {
1889                                 struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
1890 
1891                                 if (evsel && evsel->side_band.cb)
1892                                         evsel->side_band.cb(event, evsel->side_band.data);
1893                                 else
1894                                         pr_warning("cannot locate proper evsel for the side band event\n");
1895 
1896                                 perf_mmap__consume(map);
1897                         }
1898                         perf_mmap__read_done(map);
1899                 }
1900         }
1901         return NULL;
1902 }
1903 
1904 int perf_evlist__start_sb_thread(struct perf_evlist *evlist,
1905                                  struct target *target)
1906 {
1907         struct perf_evsel *counter;
1908 
1909         if (!evlist)
1910                 return 0;
1911 
1912         if (perf_evlist__create_maps(evlist, target))
1913                 goto out_delete_evlist;
1914 
1915         evlist__for_each_entry(evlist, counter) {
1916                 if (perf_evsel__open(counter, evlist->cpus,
1917                                      evlist->threads) < 0)
1918                         goto out_delete_evlist;
1919         }
1920 
1921         if (perf_evlist__mmap(evlist, UINT_MAX))
1922                 goto out_delete_evlist;
1923 
1924         evlist__for_each_entry(evlist, counter) {
1925                 if (perf_evsel__enable(counter))
1926                         goto out_delete_evlist;
1927         }
1928 
1929         evlist->thread.done = 0;
1930         if (pthread_create(&evlist->thread.th, NULL, perf_evlist__poll_thread, evlist))
1931                 goto out_delete_evlist;
1932 
1933         return 0;
1934 
1935 out_delete_evlist:
1936         perf_evlist__delete(evlist);
1937         evlist = NULL;
1938         return -1;
1939 }
1940 
1941 void perf_evlist__stop_sb_thread(struct perf_evlist *evlist)
1942 {
1943         if (!evlist)
1944                 return;
1945         evlist->thread.done = 1;
1946         pthread_join(evlist->thread.th, NULL);
1947         perf_evlist__delete(evlist);
1948 }
1949 

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