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