Commit | Line | Data |
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f8a95309 ACM |
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 | */ | |
a8c9ae18 | 9 | #include "util.h" |
553873e1 | 10 | #include <api/fs/debugfs.h> |
5c581041 | 11 | #include <poll.h> |
f8a95309 ACM |
12 | #include "cpumap.h" |
13 | #include "thread_map.h" | |
12864b31 | 14 | #include "target.h" |
361c99a6 ACM |
15 | #include "evlist.h" |
16 | #include "evsel.h" | |
e3e1a54f | 17 | #include "debug.h" |
35b9d88e | 18 | #include <unistd.h> |
361c99a6 | 19 | |
50d08e47 | 20 | #include "parse-events.h" |
994a1f78 | 21 | #include "parse-options.h" |
50d08e47 | 22 | |
f8a95309 ACM |
23 | #include <sys/mman.h> |
24 | ||
70db7533 ACM |
25 | #include <linux/bitops.h> |
26 | #include <linux/hash.h> | |
27 | ||
f8a95309 | 28 | #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
a91e5431 | 29 | #define SID(e, x, y) xyarray__entry(e->sample_id, x, y) |
f8a95309 | 30 | |
7e2ed097 ACM |
31 | void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus, |
32 | struct thread_map *threads) | |
ef1d1af2 ACM |
33 | { |
34 | int i; | |
35 | ||
36 | for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i) | |
37 | INIT_HLIST_HEAD(&evlist->heads[i]); | |
38 | INIT_LIST_HEAD(&evlist->entries); | |
7e2ed097 | 39 | perf_evlist__set_maps(evlist, cpus, threads); |
35b9d88e | 40 | evlist->workload.pid = -1; |
ef1d1af2 ACM |
41 | } |
42 | ||
334fe7a3 | 43 | struct perf_evlist *perf_evlist__new(void) |
361c99a6 ACM |
44 | { |
45 | struct perf_evlist *evlist = zalloc(sizeof(*evlist)); | |
46 | ||
ef1d1af2 | 47 | if (evlist != NULL) |
334fe7a3 | 48 | perf_evlist__init(evlist, NULL, NULL); |
361c99a6 ACM |
49 | |
50 | return evlist; | |
51 | } | |
52 | ||
b22d54b0 JO |
53 | struct perf_evlist *perf_evlist__new_default(void) |
54 | { | |
55 | struct perf_evlist *evlist = perf_evlist__new(); | |
56 | ||
57 | if (evlist && perf_evlist__add_default(evlist)) { | |
58 | perf_evlist__delete(evlist); | |
59 | evlist = NULL; | |
60 | } | |
61 | ||
62 | return evlist; | |
63 | } | |
64 | ||
75562573 AH |
65 | /** |
66 | * perf_evlist__set_id_pos - set the positions of event ids. | |
67 | * @evlist: selected event list | |
68 | * | |
69 | * Events with compatible sample types all have the same id_pos | |
70 | * and is_pos. For convenience, put a copy on evlist. | |
71 | */ | |
72 | void perf_evlist__set_id_pos(struct perf_evlist *evlist) | |
73 | { | |
74 | struct perf_evsel *first = perf_evlist__first(evlist); | |
75 | ||
76 | evlist->id_pos = first->id_pos; | |
77 | evlist->is_pos = first->is_pos; | |
78 | } | |
79 | ||
733cd2fe AH |
80 | static void perf_evlist__update_id_pos(struct perf_evlist *evlist) |
81 | { | |
82 | struct perf_evsel *evsel; | |
83 | ||
0050f7aa | 84 | evlist__for_each(evlist, evsel) |
733cd2fe AH |
85 | perf_evsel__calc_id_pos(evsel); |
86 | ||
87 | perf_evlist__set_id_pos(evlist); | |
88 | } | |
89 | ||
361c99a6 ACM |
90 | static void perf_evlist__purge(struct perf_evlist *evlist) |
91 | { | |
92 | struct perf_evsel *pos, *n; | |
93 | ||
0050f7aa | 94 | evlist__for_each_safe(evlist, n, pos) { |
361c99a6 ACM |
95 | list_del_init(&pos->node); |
96 | perf_evsel__delete(pos); | |
97 | } | |
98 | ||
99 | evlist->nr_entries = 0; | |
100 | } | |
101 | ||
ef1d1af2 | 102 | void perf_evlist__exit(struct perf_evlist *evlist) |
361c99a6 | 103 | { |
04662523 ACM |
104 | zfree(&evlist->mmap); |
105 | zfree(&evlist->pollfd); | |
ef1d1af2 ACM |
106 | } |
107 | ||
108 | void perf_evlist__delete(struct perf_evlist *evlist) | |
109 | { | |
983874d1 | 110 | perf_evlist__munmap(evlist); |
f26e1c7c | 111 | perf_evlist__close(evlist); |
03ad9747 ACM |
112 | cpu_map__delete(evlist->cpus); |
113 | thread_map__delete(evlist->threads); | |
114 | evlist->cpus = NULL; | |
115 | evlist->threads = NULL; | |
ef1d1af2 ACM |
116 | perf_evlist__purge(evlist); |
117 | perf_evlist__exit(evlist); | |
361c99a6 ACM |
118 | free(evlist); |
119 | } | |
120 | ||
121 | void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry) | |
122 | { | |
123 | list_add_tail(&entry->node, &evlist->entries); | |
ef503831 ACM |
124 | entry->idx = evlist->nr_entries; |
125 | ||
75562573 AH |
126 | if (!evlist->nr_entries++) |
127 | perf_evlist__set_id_pos(evlist); | |
361c99a6 ACM |
128 | } |
129 | ||
0529bc1f JO |
130 | void perf_evlist__splice_list_tail(struct perf_evlist *evlist, |
131 | struct list_head *list, | |
132 | int nr_entries) | |
50d08e47 | 133 | { |
75562573 AH |
134 | bool set_id_pos = !evlist->nr_entries; |
135 | ||
50d08e47 ACM |
136 | list_splice_tail(list, &evlist->entries); |
137 | evlist->nr_entries += nr_entries; | |
75562573 AH |
138 | if (set_id_pos) |
139 | perf_evlist__set_id_pos(evlist); | |
50d08e47 ACM |
140 | } |
141 | ||
63dab225 ACM |
142 | void __perf_evlist__set_leader(struct list_head *list) |
143 | { | |
144 | struct perf_evsel *evsel, *leader; | |
145 | ||
146 | leader = list_entry(list->next, struct perf_evsel, node); | |
97f63e4a NK |
147 | evsel = list_entry(list->prev, struct perf_evsel, node); |
148 | ||
149 | leader->nr_members = evsel->idx - leader->idx + 1; | |
63dab225 | 150 | |
0050f7aa | 151 | __evlist__for_each(list, evsel) { |
74b2133d | 152 | evsel->leader = leader; |
63dab225 ACM |
153 | } |
154 | } | |
155 | ||
156 | void perf_evlist__set_leader(struct perf_evlist *evlist) | |
6a4bb04c | 157 | { |
97f63e4a NK |
158 | if (evlist->nr_entries) { |
159 | evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0; | |
63dab225 | 160 | __perf_evlist__set_leader(&evlist->entries); |
97f63e4a | 161 | } |
6a4bb04c JO |
162 | } |
163 | ||
361c99a6 ACM |
164 | int perf_evlist__add_default(struct perf_evlist *evlist) |
165 | { | |
166 | struct perf_event_attr attr = { | |
167 | .type = PERF_TYPE_HARDWARE, | |
168 | .config = PERF_COUNT_HW_CPU_CYCLES, | |
169 | }; | |
1aed2671 JR |
170 | struct perf_evsel *evsel; |
171 | ||
172 | event_attr_init(&attr); | |
361c99a6 | 173 | |
ef503831 | 174 | evsel = perf_evsel__new(&attr); |
361c99a6 | 175 | if (evsel == NULL) |
cc2d86b0 SE |
176 | goto error; |
177 | ||
178 | /* use strdup() because free(evsel) assumes name is allocated */ | |
179 | evsel->name = strdup("cycles"); | |
180 | if (!evsel->name) | |
181 | goto error_free; | |
361c99a6 ACM |
182 | |
183 | perf_evlist__add(evlist, evsel); | |
184 | return 0; | |
cc2d86b0 SE |
185 | error_free: |
186 | perf_evsel__delete(evsel); | |
187 | error: | |
188 | return -ENOMEM; | |
361c99a6 | 189 | } |
5c581041 | 190 | |
e60fc847 ACM |
191 | static int perf_evlist__add_attrs(struct perf_evlist *evlist, |
192 | struct perf_event_attr *attrs, size_t nr_attrs) | |
50d08e47 ACM |
193 | { |
194 | struct perf_evsel *evsel, *n; | |
195 | LIST_HEAD(head); | |
196 | size_t i; | |
197 | ||
198 | for (i = 0; i < nr_attrs; i++) { | |
ef503831 | 199 | evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i); |
50d08e47 ACM |
200 | if (evsel == NULL) |
201 | goto out_delete_partial_list; | |
202 | list_add_tail(&evsel->node, &head); | |
203 | } | |
204 | ||
205 | perf_evlist__splice_list_tail(evlist, &head, nr_attrs); | |
206 | ||
207 | return 0; | |
208 | ||
209 | out_delete_partial_list: | |
0050f7aa | 210 | __evlist__for_each_safe(&head, n, evsel) |
50d08e47 ACM |
211 | perf_evsel__delete(evsel); |
212 | return -1; | |
213 | } | |
214 | ||
79695e1b ACM |
215 | int __perf_evlist__add_default_attrs(struct perf_evlist *evlist, |
216 | struct perf_event_attr *attrs, size_t nr_attrs) | |
217 | { | |
218 | size_t i; | |
219 | ||
220 | for (i = 0; i < nr_attrs; i++) | |
221 | event_attr_init(attrs + i); | |
222 | ||
223 | return perf_evlist__add_attrs(evlist, attrs, nr_attrs); | |
224 | } | |
225 | ||
da378962 ACM |
226 | struct perf_evsel * |
227 | perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id) | |
ee29be62 ACM |
228 | { |
229 | struct perf_evsel *evsel; | |
230 | ||
0050f7aa | 231 | evlist__for_each(evlist, evsel) { |
ee29be62 ACM |
232 | if (evsel->attr.type == PERF_TYPE_TRACEPOINT && |
233 | (int)evsel->attr.config == id) | |
234 | return evsel; | |
235 | } | |
236 | ||
237 | return NULL; | |
238 | } | |
239 | ||
a2f2804a DA |
240 | struct perf_evsel * |
241 | perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist, | |
242 | const char *name) | |
243 | { | |
244 | struct perf_evsel *evsel; | |
245 | ||
0050f7aa | 246 | evlist__for_each(evlist, evsel) { |
a2f2804a DA |
247 | if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) && |
248 | (strcmp(evsel->name, name) == 0)) | |
249 | return evsel; | |
250 | } | |
251 | ||
252 | return NULL; | |
253 | } | |
254 | ||
39876e7d ACM |
255 | int perf_evlist__add_newtp(struct perf_evlist *evlist, |
256 | const char *sys, const char *name, void *handler) | |
257 | { | |
ef503831 | 258 | struct perf_evsel *evsel = perf_evsel__newtp(sys, name); |
39876e7d | 259 | |
39876e7d ACM |
260 | if (evsel == NULL) |
261 | return -1; | |
262 | ||
744a9719 | 263 | evsel->handler = handler; |
39876e7d ACM |
264 | perf_evlist__add(evlist, evsel); |
265 | return 0; | |
266 | } | |
267 | ||
4152ab37 ACM |
268 | void perf_evlist__disable(struct perf_evlist *evlist) |
269 | { | |
270 | int cpu, thread; | |
271 | struct perf_evsel *pos; | |
b3a319d5 NK |
272 | int nr_cpus = cpu_map__nr(evlist->cpus); |
273 | int nr_threads = thread_map__nr(evlist->threads); | |
4152ab37 | 274 | |
b3a319d5 | 275 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
0050f7aa | 276 | evlist__for_each(evlist, pos) { |
395c3070 | 277 | if (!perf_evsel__is_group_leader(pos) || !pos->fd) |
3fe4430d | 278 | continue; |
b3a319d5 | 279 | for (thread = 0; thread < nr_threads; thread++) |
55da8005 NK |
280 | ioctl(FD(pos, cpu, thread), |
281 | PERF_EVENT_IOC_DISABLE, 0); | |
4152ab37 ACM |
282 | } |
283 | } | |
284 | } | |
285 | ||
764e16a3 DA |
286 | void perf_evlist__enable(struct perf_evlist *evlist) |
287 | { | |
288 | int cpu, thread; | |
289 | struct perf_evsel *pos; | |
b3a319d5 NK |
290 | int nr_cpus = cpu_map__nr(evlist->cpus); |
291 | int nr_threads = thread_map__nr(evlist->threads); | |
764e16a3 | 292 | |
b3a319d5 | 293 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
0050f7aa | 294 | evlist__for_each(evlist, pos) { |
395c3070 | 295 | if (!perf_evsel__is_group_leader(pos) || !pos->fd) |
3fe4430d | 296 | continue; |
b3a319d5 | 297 | for (thread = 0; thread < nr_threads; thread++) |
55da8005 NK |
298 | ioctl(FD(pos, cpu, thread), |
299 | PERF_EVENT_IOC_ENABLE, 0); | |
764e16a3 DA |
300 | } |
301 | } | |
302 | } | |
303 | ||
395c3070 AH |
304 | int perf_evlist__disable_event(struct perf_evlist *evlist, |
305 | struct perf_evsel *evsel) | |
306 | { | |
307 | int cpu, thread, err; | |
308 | ||
309 | if (!evsel->fd) | |
310 | return 0; | |
311 | ||
312 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
313 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
314 | err = ioctl(FD(evsel, cpu, thread), | |
315 | PERF_EVENT_IOC_DISABLE, 0); | |
316 | if (err) | |
317 | return err; | |
318 | } | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | int perf_evlist__enable_event(struct perf_evlist *evlist, | |
324 | struct perf_evsel *evsel) | |
325 | { | |
326 | int cpu, thread, err; | |
327 | ||
328 | if (!evsel->fd) | |
329 | return -EINVAL; | |
330 | ||
331 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
332 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
333 | err = ioctl(FD(evsel, cpu, thread), | |
334 | PERF_EVENT_IOC_ENABLE, 0); | |
335 | if (err) | |
336 | return err; | |
337 | } | |
338 | } | |
339 | return 0; | |
340 | } | |
341 | ||
806fb630 | 342 | static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) |
5c581041 | 343 | { |
b3a319d5 NK |
344 | int nr_cpus = cpu_map__nr(evlist->cpus); |
345 | int nr_threads = thread_map__nr(evlist->threads); | |
346 | int nfds = nr_cpus * nr_threads * evlist->nr_entries; | |
5c581041 ACM |
347 | evlist->pollfd = malloc(sizeof(struct pollfd) * nfds); |
348 | return evlist->pollfd != NULL ? 0 : -ENOMEM; | |
349 | } | |
70082dd9 ACM |
350 | |
351 | void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) | |
352 | { | |
353 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
354 | evlist->pollfd[evlist->nr_fds].fd = fd; | |
355 | evlist->pollfd[evlist->nr_fds].events = POLLIN; | |
356 | evlist->nr_fds++; | |
357 | } | |
70db7533 | 358 | |
a91e5431 ACM |
359 | static void perf_evlist__id_hash(struct perf_evlist *evlist, |
360 | struct perf_evsel *evsel, | |
361 | int cpu, int thread, u64 id) | |
3d3b5e95 ACM |
362 | { |
363 | int hash; | |
364 | struct perf_sample_id *sid = SID(evsel, cpu, thread); | |
365 | ||
366 | sid->id = id; | |
367 | sid->evsel = evsel; | |
368 | hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS); | |
369 | hlist_add_head(&sid->node, &evlist->heads[hash]); | |
370 | } | |
371 | ||
a91e5431 ACM |
372 | void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel, |
373 | int cpu, int thread, u64 id) | |
374 | { | |
375 | perf_evlist__id_hash(evlist, evsel, cpu, thread, id); | |
376 | evsel->id[evsel->ids++] = id; | |
377 | } | |
378 | ||
379 | static int perf_evlist__id_add_fd(struct perf_evlist *evlist, | |
380 | struct perf_evsel *evsel, | |
381 | int cpu, int thread, int fd) | |
f8a95309 | 382 | { |
f8a95309 | 383 | u64 read_data[4] = { 0, }; |
3d3b5e95 | 384 | int id_idx = 1; /* The first entry is the counter value */ |
e2b5abe0 JO |
385 | u64 id; |
386 | int ret; | |
387 | ||
388 | ret = ioctl(fd, PERF_EVENT_IOC_ID, &id); | |
389 | if (!ret) | |
390 | goto add; | |
391 | ||
392 | if (errno != ENOTTY) | |
393 | return -1; | |
394 | ||
395 | /* Legacy way to get event id.. All hail to old kernels! */ | |
f8a95309 | 396 | |
c4861afe JO |
397 | /* |
398 | * This way does not work with group format read, so bail | |
399 | * out in that case. | |
400 | */ | |
401 | if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP) | |
402 | return -1; | |
403 | ||
f8a95309 ACM |
404 | if (!(evsel->attr.read_format & PERF_FORMAT_ID) || |
405 | read(fd, &read_data, sizeof(read_data)) == -1) | |
406 | return -1; | |
407 | ||
408 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) | |
409 | ++id_idx; | |
410 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) | |
411 | ++id_idx; | |
412 | ||
e2b5abe0 JO |
413 | id = read_data[id_idx]; |
414 | ||
415 | add: | |
416 | perf_evlist__id_add(evlist, evsel, cpu, thread, id); | |
f8a95309 ACM |
417 | return 0; |
418 | } | |
419 | ||
932a3594 | 420 | struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id) |
70db7533 ACM |
421 | { |
422 | struct hlist_head *head; | |
70db7533 ACM |
423 | struct perf_sample_id *sid; |
424 | int hash; | |
425 | ||
70db7533 ACM |
426 | hash = hash_64(id, PERF_EVLIST__HLIST_BITS); |
427 | head = &evlist->heads[hash]; | |
428 | ||
b67bfe0d | 429 | hlist_for_each_entry(sid, head, node) |
70db7533 | 430 | if (sid->id == id) |
932a3594 JO |
431 | return sid; |
432 | ||
433 | return NULL; | |
434 | } | |
435 | ||
436 | struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id) | |
437 | { | |
438 | struct perf_sample_id *sid; | |
439 | ||
440 | if (evlist->nr_entries == 1) | |
441 | return perf_evlist__first(evlist); | |
442 | ||
443 | sid = perf_evlist__id2sid(evlist, id); | |
444 | if (sid) | |
445 | return sid->evsel; | |
30e68bcc NK |
446 | |
447 | if (!perf_evlist__sample_id_all(evlist)) | |
0c21f736 | 448 | return perf_evlist__first(evlist); |
30e68bcc | 449 | |
70db7533 ACM |
450 | return NULL; |
451 | } | |
04391deb | 452 | |
75562573 AH |
453 | static int perf_evlist__event2id(struct perf_evlist *evlist, |
454 | union perf_event *event, u64 *id) | |
455 | { | |
456 | const u64 *array = event->sample.array; | |
457 | ssize_t n; | |
458 | ||
459 | n = (event->header.size - sizeof(event->header)) >> 3; | |
460 | ||
461 | if (event->header.type == PERF_RECORD_SAMPLE) { | |
462 | if (evlist->id_pos >= n) | |
463 | return -1; | |
464 | *id = array[evlist->id_pos]; | |
465 | } else { | |
466 | if (evlist->is_pos > n) | |
467 | return -1; | |
468 | n -= evlist->is_pos; | |
469 | *id = array[n]; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist, | |
475 | union perf_event *event) | |
476 | { | |
98be6966 | 477 | struct perf_evsel *first = perf_evlist__first(evlist); |
75562573 AH |
478 | struct hlist_head *head; |
479 | struct perf_sample_id *sid; | |
480 | int hash; | |
481 | u64 id; | |
482 | ||
483 | if (evlist->nr_entries == 1) | |
98be6966 AH |
484 | return first; |
485 | ||
486 | if (!first->attr.sample_id_all && | |
487 | event->header.type != PERF_RECORD_SAMPLE) | |
488 | return first; | |
75562573 AH |
489 | |
490 | if (perf_evlist__event2id(evlist, event, &id)) | |
491 | return NULL; | |
492 | ||
493 | /* Synthesized events have an id of zero */ | |
494 | if (!id) | |
98be6966 | 495 | return first; |
75562573 AH |
496 | |
497 | hash = hash_64(id, PERF_EVLIST__HLIST_BITS); | |
498 | head = &evlist->heads[hash]; | |
499 | ||
500 | hlist_for_each_entry(sid, head, node) { | |
501 | if (sid->id == id) | |
502 | return sid->evsel; | |
503 | } | |
504 | return NULL; | |
505 | } | |
506 | ||
aece948f | 507 | union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx) |
04391deb | 508 | { |
aece948f | 509 | struct perf_mmap *md = &evlist->mmap[idx]; |
04391deb ACM |
510 | unsigned int head = perf_mmap__read_head(md); |
511 | unsigned int old = md->prev; | |
512 | unsigned char *data = md->base + page_size; | |
8115d60c | 513 | union perf_event *event = NULL; |
04391deb | 514 | |
7bb41152 | 515 | if (evlist->overwrite) { |
04391deb | 516 | /* |
7bb41152 ACM |
517 | * If we're further behind than half the buffer, there's a chance |
518 | * the writer will bite our tail and mess up the samples under us. | |
519 | * | |
520 | * If we somehow ended up ahead of the head, we got messed up. | |
521 | * | |
522 | * In either case, truncate and restart at head. | |
04391deb | 523 | */ |
7bb41152 ACM |
524 | int diff = head - old; |
525 | if (diff > md->mask / 2 || diff < 0) { | |
526 | fprintf(stderr, "WARNING: failed to keep up with mmap data.\n"); | |
527 | ||
528 | /* | |
529 | * head points to a known good entry, start there. | |
530 | */ | |
531 | old = head; | |
532 | } | |
04391deb ACM |
533 | } |
534 | ||
535 | if (old != head) { | |
536 | size_t size; | |
537 | ||
8115d60c | 538 | event = (union perf_event *)&data[old & md->mask]; |
04391deb ACM |
539 | size = event->header.size; |
540 | ||
541 | /* | |
542 | * Event straddles the mmap boundary -- header should always | |
543 | * be inside due to u64 alignment of output. | |
544 | */ | |
545 | if ((old & md->mask) + size != ((old + size) & md->mask)) { | |
546 | unsigned int offset = old; | |
547 | unsigned int len = min(sizeof(*event), size), cpy; | |
a65cb4b9 | 548 | void *dst = md->event_copy; |
04391deb ACM |
549 | |
550 | do { | |
551 | cpy = min(md->mask + 1 - (offset & md->mask), len); | |
552 | memcpy(dst, &data[offset & md->mask], cpy); | |
553 | offset += cpy; | |
554 | dst += cpy; | |
555 | len -= cpy; | |
556 | } while (len); | |
557 | ||
a65cb4b9 | 558 | event = (union perf_event *) md->event_copy; |
04391deb ACM |
559 | } |
560 | ||
561 | old += size; | |
562 | } | |
563 | ||
564 | md->prev = old; | |
7bb41152 | 565 | |
04391deb ACM |
566 | return event; |
567 | } | |
f8a95309 | 568 | |
8e50d384 ZZ |
569 | void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx) |
570 | { | |
571 | if (!evlist->overwrite) { | |
572 | struct perf_mmap *md = &evlist->mmap[idx]; | |
573 | unsigned int old = md->prev; | |
574 | ||
575 | perf_mmap__write_tail(md, old); | |
576 | } | |
577 | } | |
578 | ||
93edcbd9 AH |
579 | static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx) |
580 | { | |
581 | if (evlist->mmap[idx].base != NULL) { | |
582 | munmap(evlist->mmap[idx].base, evlist->mmap_len); | |
583 | evlist->mmap[idx].base = NULL; | |
584 | } | |
585 | } | |
586 | ||
7e2ed097 | 587 | void perf_evlist__munmap(struct perf_evlist *evlist) |
f8a95309 | 588 | { |
aece948f | 589 | int i; |
f8a95309 | 590 | |
983874d1 ACM |
591 | if (evlist->mmap == NULL) |
592 | return; | |
593 | ||
93edcbd9 AH |
594 | for (i = 0; i < evlist->nr_mmaps; i++) |
595 | __perf_evlist__munmap(evlist, i); | |
aece948f | 596 | |
04662523 | 597 | zfree(&evlist->mmap); |
f8a95309 ACM |
598 | } |
599 | ||
806fb630 | 600 | static int perf_evlist__alloc_mmap(struct perf_evlist *evlist) |
f8a95309 | 601 | { |
a14bb7a6 | 602 | evlist->nr_mmaps = cpu_map__nr(evlist->cpus); |
ec1e7e43 | 603 | if (cpu_map__empty(evlist->cpus)) |
b3a319d5 | 604 | evlist->nr_mmaps = thread_map__nr(evlist->threads); |
aece948f | 605 | evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); |
f8a95309 ACM |
606 | return evlist->mmap != NULL ? 0 : -ENOMEM; |
607 | } | |
608 | ||
a8a8f3eb AH |
609 | struct mmap_params { |
610 | int prot; | |
611 | int mask; | |
612 | }; | |
613 | ||
614 | static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx, | |
615 | struct mmap_params *mp, int fd) | |
f8a95309 | 616 | { |
aece948f | 617 | evlist->mmap[idx].prev = 0; |
a8a8f3eb AH |
618 | evlist->mmap[idx].mask = mp->mask; |
619 | evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, mp->prot, | |
f8a95309 | 620 | MAP_SHARED, fd, 0); |
301b195d | 621 | if (evlist->mmap[idx].base == MAP_FAILED) { |
02635965 AH |
622 | pr_debug2("failed to mmap perf event ring buffer, error %d\n", |
623 | errno); | |
301b195d | 624 | evlist->mmap[idx].base = NULL; |
f8a95309 | 625 | return -1; |
301b195d | 626 | } |
f8a95309 ACM |
627 | |
628 | perf_evlist__add_pollfd(evlist, fd); | |
629 | return 0; | |
630 | } | |
631 | ||
04e21314 | 632 | static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, |
a8a8f3eb AH |
633 | struct mmap_params *mp, int cpu, |
634 | int thread, int *output) | |
aece948f ACM |
635 | { |
636 | struct perf_evsel *evsel; | |
04e21314 | 637 | |
0050f7aa | 638 | evlist__for_each(evlist, evsel) { |
04e21314 AH |
639 | int fd = FD(evsel, cpu, thread); |
640 | ||
641 | if (*output == -1) { | |
642 | *output = fd; | |
a8a8f3eb | 643 | if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0) |
04e21314 AH |
644 | return -1; |
645 | } else { | |
646 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0) | |
647 | return -1; | |
648 | } | |
649 | ||
650 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
651 | perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0) | |
652 | return -1; | |
653 | } | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
a8a8f3eb AH |
658 | static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, |
659 | struct mmap_params *mp) | |
04e21314 | 660 | { |
aece948f | 661 | int cpu, thread; |
b3a319d5 NK |
662 | int nr_cpus = cpu_map__nr(evlist->cpus); |
663 | int nr_threads = thread_map__nr(evlist->threads); | |
aece948f | 664 | |
e3e1a54f | 665 | pr_debug2("perf event ring buffer mmapped per cpu\n"); |
b3a319d5 | 666 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
aece948f ACM |
667 | int output = -1; |
668 | ||
b3a319d5 | 669 | for (thread = 0; thread < nr_threads; thread++) { |
a8a8f3eb AH |
670 | if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu, |
671 | thread, &output)) | |
04e21314 | 672 | goto out_unmap; |
aece948f ACM |
673 | } |
674 | } | |
675 | ||
676 | return 0; | |
677 | ||
678 | out_unmap: | |
93edcbd9 AH |
679 | for (cpu = 0; cpu < nr_cpus; cpu++) |
680 | __perf_evlist__munmap(evlist, cpu); | |
aece948f ACM |
681 | return -1; |
682 | } | |
683 | ||
a8a8f3eb AH |
684 | static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, |
685 | struct mmap_params *mp) | |
aece948f | 686 | { |
aece948f | 687 | int thread; |
b3a319d5 | 688 | int nr_threads = thread_map__nr(evlist->threads); |
aece948f | 689 | |
e3e1a54f | 690 | pr_debug2("perf event ring buffer mmapped per thread\n"); |
b3a319d5 | 691 | for (thread = 0; thread < nr_threads; thread++) { |
aece948f ACM |
692 | int output = -1; |
693 | ||
a8a8f3eb AH |
694 | if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread, |
695 | &output)) | |
04e21314 | 696 | goto out_unmap; |
aece948f ACM |
697 | } |
698 | ||
699 | return 0; | |
700 | ||
701 | out_unmap: | |
93edcbd9 AH |
702 | for (thread = 0; thread < nr_threads; thread++) |
703 | __perf_evlist__munmap(evlist, thread); | |
aece948f ACM |
704 | return -1; |
705 | } | |
706 | ||
994a1f78 JO |
707 | static size_t perf_evlist__mmap_size(unsigned long pages) |
708 | { | |
709 | /* 512 kiB: default amount of unprivileged mlocked memory */ | |
710 | if (pages == UINT_MAX) | |
711 | pages = (512 * 1024) / page_size; | |
712 | else if (!is_power_of_2(pages)) | |
713 | return 0; | |
714 | ||
715 | return (pages + 1) * page_size; | |
716 | } | |
717 | ||
33c2dcfd DA |
718 | static long parse_pages_arg(const char *str, unsigned long min, |
719 | unsigned long max) | |
994a1f78 | 720 | { |
2fbe4abe | 721 | unsigned long pages, val; |
27050f53 JO |
722 | static struct parse_tag tags[] = { |
723 | { .tag = 'B', .mult = 1 }, | |
724 | { .tag = 'K', .mult = 1 << 10 }, | |
725 | { .tag = 'M', .mult = 1 << 20 }, | |
726 | { .tag = 'G', .mult = 1 << 30 }, | |
727 | { .tag = 0 }, | |
728 | }; | |
994a1f78 | 729 | |
8973504b | 730 | if (str == NULL) |
33c2dcfd | 731 | return -EINVAL; |
8973504b | 732 | |
27050f53 | 733 | val = parse_tag_value(str, tags); |
2fbe4abe | 734 | if (val != (unsigned long) -1) { |
27050f53 JO |
735 | /* we got file size value */ |
736 | pages = PERF_ALIGN(val, page_size) / page_size; | |
27050f53 JO |
737 | } else { |
738 | /* we got pages count value */ | |
739 | char *eptr; | |
740 | pages = strtoul(str, &eptr, 10); | |
33c2dcfd DA |
741 | if (*eptr != '\0') |
742 | return -EINVAL; | |
994a1f78 JO |
743 | } |
744 | ||
2bcab6c1 | 745 | if (pages == 0 && min == 0) { |
33c2dcfd | 746 | /* leave number of pages at 0 */ |
1dbfa938 | 747 | } else if (!is_power_of_2(pages)) { |
33c2dcfd | 748 | /* round pages up to next power of 2 */ |
1dbfa938 AH |
749 | pages = next_pow2_l(pages); |
750 | if (!pages) | |
751 | return -EINVAL; | |
9639837e DA |
752 | pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n", |
753 | pages * page_size, pages); | |
2fbe4abe AH |
754 | } |
755 | ||
33c2dcfd DA |
756 | if (pages > max) |
757 | return -EINVAL; | |
758 | ||
759 | return pages; | |
760 | } | |
761 | ||
762 | int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, | |
763 | int unset __maybe_unused) | |
764 | { | |
765 | unsigned int *mmap_pages = opt->value; | |
766 | unsigned long max = UINT_MAX; | |
767 | long pages; | |
768 | ||
f5ae9c42 | 769 | if (max > SIZE_MAX / page_size) |
33c2dcfd DA |
770 | max = SIZE_MAX / page_size; |
771 | ||
772 | pages = parse_pages_arg(str, 1, max); | |
773 | if (pages < 0) { | |
774 | pr_err("Invalid argument for --mmap_pages/-m\n"); | |
994a1f78 JO |
775 | return -1; |
776 | } | |
777 | ||
778 | *mmap_pages = pages; | |
779 | return 0; | |
780 | } | |
781 | ||
c83fa7f2 AH |
782 | /** |
783 | * perf_evlist__mmap - Create mmaps to receive events. | |
784 | * @evlist: list of events | |
785 | * @pages: map length in pages | |
786 | * @overwrite: overwrite older events? | |
f8a95309 | 787 | * |
c83fa7f2 AH |
788 | * If @overwrite is %false the user needs to signal event consumption using |
789 | * perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this | |
790 | * automatically. | |
7e2ed097 | 791 | * |
c83fa7f2 | 792 | * Return: %0 on success, negative error code otherwise. |
f8a95309 | 793 | */ |
50a682ce ACM |
794 | int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages, |
795 | bool overwrite) | |
f8a95309 | 796 | { |
aece948f | 797 | struct perf_evsel *evsel; |
7e2ed097 ACM |
798 | const struct cpu_map *cpus = evlist->cpus; |
799 | const struct thread_map *threads = evlist->threads; | |
a8a8f3eb AH |
800 | struct mmap_params mp = { |
801 | .prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), | |
802 | }; | |
50a682ce | 803 | |
7e2ed097 | 804 | if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) |
f8a95309 ACM |
805 | return -ENOMEM; |
806 | ||
7e2ed097 | 807 | if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0) |
f8a95309 ACM |
808 | return -ENOMEM; |
809 | ||
810 | evlist->overwrite = overwrite; | |
994a1f78 | 811 | evlist->mmap_len = perf_evlist__mmap_size(pages); |
2af68ef5 | 812 | pr_debug("mmap size %zuB\n", evlist->mmap_len); |
a8a8f3eb | 813 | mp.mask = evlist->mmap_len - page_size - 1; |
f8a95309 | 814 | |
0050f7aa | 815 | evlist__for_each(evlist, evsel) { |
f8a95309 | 816 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && |
a91e5431 | 817 | evsel->sample_id == NULL && |
a14bb7a6 | 818 | perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0) |
f8a95309 | 819 | return -ENOMEM; |
f8a95309 ACM |
820 | } |
821 | ||
ec1e7e43 | 822 | if (cpu_map__empty(cpus)) |
a8a8f3eb | 823 | return perf_evlist__mmap_per_thread(evlist, &mp); |
f8a95309 | 824 | |
a8a8f3eb | 825 | return perf_evlist__mmap_per_cpu(evlist, &mp); |
f8a95309 | 826 | } |
7e2ed097 | 827 | |
602ad878 | 828 | int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target) |
7e2ed097 | 829 | { |
b809ac10 NK |
830 | evlist->threads = thread_map__new_str(target->pid, target->tid, |
831 | target->uid); | |
7e2ed097 ACM |
832 | |
833 | if (evlist->threads == NULL) | |
834 | return -1; | |
835 | ||
9c105fbc | 836 | if (target__uses_dummy_map(target)) |
d1cb9fce | 837 | evlist->cpus = cpu_map__dummy_new(); |
879d77d0 NK |
838 | else |
839 | evlist->cpus = cpu_map__new(target->cpu_list); | |
7e2ed097 ACM |
840 | |
841 | if (evlist->cpus == NULL) | |
842 | goto out_delete_threads; | |
843 | ||
844 | return 0; | |
845 | ||
846 | out_delete_threads: | |
847 | thread_map__delete(evlist->threads); | |
848 | return -1; | |
849 | } | |
850 | ||
1491a632 | 851 | int perf_evlist__apply_filters(struct perf_evlist *evlist) |
0a102479 | 852 | { |
0a102479 | 853 | struct perf_evsel *evsel; |
745cefc5 ACM |
854 | int err = 0; |
855 | const int ncpus = cpu_map__nr(evlist->cpus), | |
b3a319d5 | 856 | nthreads = thread_map__nr(evlist->threads); |
0a102479 | 857 | |
0050f7aa | 858 | evlist__for_each(evlist, evsel) { |
745cefc5 | 859 | if (evsel->filter == NULL) |
0a102479 | 860 | continue; |
745cefc5 ACM |
861 | |
862 | err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter); | |
863 | if (err) | |
864 | break; | |
0a102479 FW |
865 | } |
866 | ||
745cefc5 ACM |
867 | return err; |
868 | } | |
869 | ||
870 | int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter) | |
871 | { | |
872 | struct perf_evsel *evsel; | |
873 | int err = 0; | |
874 | const int ncpus = cpu_map__nr(evlist->cpus), | |
b3a319d5 | 875 | nthreads = thread_map__nr(evlist->threads); |
745cefc5 | 876 | |
0050f7aa | 877 | evlist__for_each(evlist, evsel) { |
745cefc5 ACM |
878 | err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter); |
879 | if (err) | |
880 | break; | |
881 | } | |
882 | ||
883 | return err; | |
0a102479 | 884 | } |
74429964 | 885 | |
0c21f736 | 886 | bool perf_evlist__valid_sample_type(struct perf_evlist *evlist) |
74429964 | 887 | { |
75562573 | 888 | struct perf_evsel *pos; |
c2a70653 | 889 | |
75562573 AH |
890 | if (evlist->nr_entries == 1) |
891 | return true; | |
892 | ||
893 | if (evlist->id_pos < 0 || evlist->is_pos < 0) | |
894 | return false; | |
895 | ||
0050f7aa | 896 | evlist__for_each(evlist, pos) { |
75562573 AH |
897 | if (pos->id_pos != evlist->id_pos || |
898 | pos->is_pos != evlist->is_pos) | |
c2a70653 | 899 | return false; |
74429964 FW |
900 | } |
901 | ||
c2a70653 | 902 | return true; |
74429964 FW |
903 | } |
904 | ||
75562573 | 905 | u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist) |
c2a70653 | 906 | { |
75562573 AH |
907 | struct perf_evsel *evsel; |
908 | ||
909 | if (evlist->combined_sample_type) | |
910 | return evlist->combined_sample_type; | |
911 | ||
0050f7aa | 912 | evlist__for_each(evlist, evsel) |
75562573 AH |
913 | evlist->combined_sample_type |= evsel->attr.sample_type; |
914 | ||
915 | return evlist->combined_sample_type; | |
916 | } | |
917 | ||
918 | u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist) | |
919 | { | |
920 | evlist->combined_sample_type = 0; | |
921 | return __perf_evlist__combined_sample_type(evlist); | |
c2a70653 ACM |
922 | } |
923 | ||
9ede473c JO |
924 | bool perf_evlist__valid_read_format(struct perf_evlist *evlist) |
925 | { | |
926 | struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; | |
927 | u64 read_format = first->attr.read_format; | |
928 | u64 sample_type = first->attr.sample_type; | |
929 | ||
0050f7aa | 930 | evlist__for_each(evlist, pos) { |
9ede473c JO |
931 | if (read_format != pos->attr.read_format) |
932 | return false; | |
933 | } | |
934 | ||
935 | /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */ | |
936 | if ((sample_type & PERF_SAMPLE_READ) && | |
937 | !(read_format & PERF_FORMAT_ID)) { | |
938 | return false; | |
939 | } | |
940 | ||
941 | return true; | |
942 | } | |
943 | ||
944 | u64 perf_evlist__read_format(struct perf_evlist *evlist) | |
945 | { | |
946 | struct perf_evsel *first = perf_evlist__first(evlist); | |
947 | return first->attr.read_format; | |
948 | } | |
949 | ||
0c21f736 | 950 | u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist) |
81e36bff | 951 | { |
0c21f736 | 952 | struct perf_evsel *first = perf_evlist__first(evlist); |
81e36bff ACM |
953 | struct perf_sample *data; |
954 | u64 sample_type; | |
955 | u16 size = 0; | |
956 | ||
81e36bff ACM |
957 | if (!first->attr.sample_id_all) |
958 | goto out; | |
959 | ||
960 | sample_type = first->attr.sample_type; | |
961 | ||
962 | if (sample_type & PERF_SAMPLE_TID) | |
963 | size += sizeof(data->tid) * 2; | |
964 | ||
965 | if (sample_type & PERF_SAMPLE_TIME) | |
966 | size += sizeof(data->time); | |
967 | ||
968 | if (sample_type & PERF_SAMPLE_ID) | |
969 | size += sizeof(data->id); | |
970 | ||
971 | if (sample_type & PERF_SAMPLE_STREAM_ID) | |
972 | size += sizeof(data->stream_id); | |
973 | ||
974 | if (sample_type & PERF_SAMPLE_CPU) | |
975 | size += sizeof(data->cpu) * 2; | |
75562573 AH |
976 | |
977 | if (sample_type & PERF_SAMPLE_IDENTIFIER) | |
978 | size += sizeof(data->id); | |
81e36bff ACM |
979 | out: |
980 | return size; | |
981 | } | |
982 | ||
0c21f736 | 983 | bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist) |
74429964 | 984 | { |
0c21f736 | 985 | struct perf_evsel *first = perf_evlist__first(evlist), *pos = first; |
c2a70653 | 986 | |
0050f7aa | 987 | evlist__for_each_continue(evlist, pos) { |
c2a70653 ACM |
988 | if (first->attr.sample_id_all != pos->attr.sample_id_all) |
989 | return false; | |
74429964 FW |
990 | } |
991 | ||
c2a70653 ACM |
992 | return true; |
993 | } | |
994 | ||
0c21f736 | 995 | bool perf_evlist__sample_id_all(struct perf_evlist *evlist) |
c2a70653 | 996 | { |
0c21f736 | 997 | struct perf_evsel *first = perf_evlist__first(evlist); |
c2a70653 | 998 | return first->attr.sample_id_all; |
74429964 | 999 | } |
81cce8de ACM |
1000 | |
1001 | void perf_evlist__set_selected(struct perf_evlist *evlist, | |
1002 | struct perf_evsel *evsel) | |
1003 | { | |
1004 | evlist->selected = evsel; | |
1005 | } | |
727ab04e | 1006 | |
a74b4b66 NK |
1007 | void perf_evlist__close(struct perf_evlist *evlist) |
1008 | { | |
1009 | struct perf_evsel *evsel; | |
1010 | int ncpus = cpu_map__nr(evlist->cpus); | |
1011 | int nthreads = thread_map__nr(evlist->threads); | |
8ad9219e | 1012 | int n; |
a74b4b66 | 1013 | |
8ad9219e SE |
1014 | evlist__for_each_reverse(evlist, evsel) { |
1015 | n = evsel->cpus ? evsel->cpus->nr : ncpus; | |
1016 | perf_evsel__close(evsel, n, nthreads); | |
1017 | } | |
a74b4b66 NK |
1018 | } |
1019 | ||
6a4bb04c | 1020 | int perf_evlist__open(struct perf_evlist *evlist) |
727ab04e | 1021 | { |
6a4bb04c | 1022 | struct perf_evsel *evsel; |
a74b4b66 | 1023 | int err; |
727ab04e | 1024 | |
733cd2fe AH |
1025 | perf_evlist__update_id_pos(evlist); |
1026 | ||
0050f7aa | 1027 | evlist__for_each(evlist, evsel) { |
6a4bb04c | 1028 | err = perf_evsel__open(evsel, evlist->cpus, evlist->threads); |
727ab04e ACM |
1029 | if (err < 0) |
1030 | goto out_err; | |
1031 | } | |
1032 | ||
1033 | return 0; | |
1034 | out_err: | |
a74b4b66 | 1035 | perf_evlist__close(evlist); |
41c21a68 | 1036 | errno = -err; |
727ab04e ACM |
1037 | return err; |
1038 | } | |
35b9d88e | 1039 | |
602ad878 | 1040 | int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target, |
55e162ea | 1041 | const char *argv[], bool pipe_output, |
735f7e0b | 1042 | void (*exec_error)(int signo, siginfo_t *info, void *ucontext)) |
35b9d88e ACM |
1043 | { |
1044 | int child_ready_pipe[2], go_pipe[2]; | |
1045 | char bf; | |
1046 | ||
1047 | if (pipe(child_ready_pipe) < 0) { | |
1048 | perror("failed to create 'ready' pipe"); | |
1049 | return -1; | |
1050 | } | |
1051 | ||
1052 | if (pipe(go_pipe) < 0) { | |
1053 | perror("failed to create 'go' pipe"); | |
1054 | goto out_close_ready_pipe; | |
1055 | } | |
1056 | ||
1057 | evlist->workload.pid = fork(); | |
1058 | if (evlist->workload.pid < 0) { | |
1059 | perror("failed to fork"); | |
1060 | goto out_close_pipes; | |
1061 | } | |
1062 | ||
1063 | if (!evlist->workload.pid) { | |
5f1c4225 ACM |
1064 | int ret; |
1065 | ||
119fa3c9 | 1066 | if (pipe_output) |
35b9d88e ACM |
1067 | dup2(2, 1); |
1068 | ||
0817df08 DA |
1069 | signal(SIGTERM, SIG_DFL); |
1070 | ||
35b9d88e ACM |
1071 | close(child_ready_pipe[0]); |
1072 | close(go_pipe[1]); | |
1073 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
1074 | ||
35b9d88e ACM |
1075 | /* |
1076 | * Tell the parent we're ready to go | |
1077 | */ | |
1078 | close(child_ready_pipe[1]); | |
1079 | ||
1080 | /* | |
1081 | * Wait until the parent tells us to go. | |
1082 | */ | |
5f1c4225 ACM |
1083 | ret = read(go_pipe[0], &bf, 1); |
1084 | /* | |
1085 | * The parent will ask for the execvp() to be performed by | |
1086 | * writing exactly one byte, in workload.cork_fd, usually via | |
1087 | * perf_evlist__start_workload(). | |
1088 | * | |
1089 | * For cancelling the workload without actuallin running it, | |
1090 | * the parent will just close workload.cork_fd, without writing | |
1091 | * anything, i.e. read will return zero and we just exit() | |
1092 | * here. | |
1093 | */ | |
1094 | if (ret != 1) { | |
1095 | if (ret == -1) | |
1096 | perror("unable to read pipe"); | |
1097 | exit(ret); | |
1098 | } | |
35b9d88e ACM |
1099 | |
1100 | execvp(argv[0], (char **)argv); | |
1101 | ||
735f7e0b | 1102 | if (exec_error) { |
f33cbe72 ACM |
1103 | union sigval val; |
1104 | ||
1105 | val.sival_int = errno; | |
1106 | if (sigqueue(getppid(), SIGUSR1, val)) | |
1107 | perror(argv[0]); | |
1108 | } else | |
1109 | perror(argv[0]); | |
35b9d88e ACM |
1110 | exit(-1); |
1111 | } | |
1112 | ||
735f7e0b ACM |
1113 | if (exec_error) { |
1114 | struct sigaction act = { | |
1115 | .sa_flags = SA_SIGINFO, | |
1116 | .sa_sigaction = exec_error, | |
1117 | }; | |
1118 | sigaction(SIGUSR1, &act, NULL); | |
1119 | } | |
1120 | ||
602ad878 | 1121 | if (target__none(target)) |
35b9d88e ACM |
1122 | evlist->threads->map[0] = evlist->workload.pid; |
1123 | ||
1124 | close(child_ready_pipe[1]); | |
1125 | close(go_pipe[0]); | |
1126 | /* | |
1127 | * wait for child to settle | |
1128 | */ | |
1129 | if (read(child_ready_pipe[0], &bf, 1) == -1) { | |
1130 | perror("unable to read pipe"); | |
1131 | goto out_close_pipes; | |
1132 | } | |
1133 | ||
bcf3145f | 1134 | fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC); |
35b9d88e ACM |
1135 | evlist->workload.cork_fd = go_pipe[1]; |
1136 | close(child_ready_pipe[0]); | |
1137 | return 0; | |
1138 | ||
1139 | out_close_pipes: | |
1140 | close(go_pipe[0]); | |
1141 | close(go_pipe[1]); | |
1142 | out_close_ready_pipe: | |
1143 | close(child_ready_pipe[0]); | |
1144 | close(child_ready_pipe[1]); | |
1145 | return -1; | |
1146 | } | |
1147 | ||
1148 | int perf_evlist__start_workload(struct perf_evlist *evlist) | |
1149 | { | |
1150 | if (evlist->workload.cork_fd > 0) { | |
b3824404 | 1151 | char bf = 0; |
bcf3145f | 1152 | int ret; |
35b9d88e ACM |
1153 | /* |
1154 | * Remove the cork, let it rip! | |
1155 | */ | |
bcf3145f NK |
1156 | ret = write(evlist->workload.cork_fd, &bf, 1); |
1157 | if (ret < 0) | |
1158 | perror("enable to write to pipe"); | |
1159 | ||
1160 | close(evlist->workload.cork_fd); | |
1161 | return ret; | |
35b9d88e ACM |
1162 | } |
1163 | ||
1164 | return 0; | |
1165 | } | |
cb0b29e0 | 1166 | |
a3f698fe | 1167 | int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event, |
0807d2d8 | 1168 | struct perf_sample *sample) |
cb0b29e0 | 1169 | { |
75562573 AH |
1170 | struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event); |
1171 | ||
1172 | if (!evsel) | |
1173 | return -EFAULT; | |
0807d2d8 | 1174 | return perf_evsel__parse_sample(evsel, event, sample); |
cb0b29e0 | 1175 | } |
78f067b3 ACM |
1176 | |
1177 | size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp) | |
1178 | { | |
1179 | struct perf_evsel *evsel; | |
1180 | size_t printed = 0; | |
1181 | ||
0050f7aa | 1182 | evlist__for_each(evlist, evsel) { |
78f067b3 ACM |
1183 | printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "", |
1184 | perf_evsel__name(evsel)); | |
1185 | } | |
1186 | ||
b2222139 | 1187 | return printed + fprintf(fp, "\n"); |
78f067b3 | 1188 | } |
6ef068cb ACM |
1189 | |
1190 | int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused, | |
1191 | int err, char *buf, size_t size) | |
1192 | { | |
1193 | char sbuf[128]; | |
1194 | ||
1195 | switch (err) { | |
1196 | case ENOENT: | |
1197 | scnprintf(buf, size, "%s", | |
1198 | "Error:\tUnable to find debugfs\n" | |
1199 | "Hint:\tWas your kernel was compiled with debugfs support?\n" | |
1200 | "Hint:\tIs the debugfs filesystem mounted?\n" | |
1201 | "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'"); | |
1202 | break; | |
1203 | case EACCES: | |
1204 | scnprintf(buf, size, | |
1205 | "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n" | |
1206 | "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n", | |
1207 | debugfs_mountpoint, debugfs_mountpoint); | |
1208 | break; | |
1209 | default: | |
1210 | scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf))); | |
1211 | break; | |
1212 | } | |
1213 | ||
1214 | return 0; | |
1215 | } | |
a8f23d8f ACM |
1216 | |
1217 | int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, | |
1218 | int err, char *buf, size_t size) | |
1219 | { | |
1220 | int printed, value; | |
1221 | char sbuf[128], *emsg = strerror_r(err, sbuf, sizeof(sbuf)); | |
1222 | ||
1223 | switch (err) { | |
1224 | case EACCES: | |
1225 | case EPERM: | |
1226 | printed = scnprintf(buf, size, | |
1227 | "Error:\t%s.\n" | |
1228 | "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg); | |
1229 | ||
1a47245d | 1230 | value = perf_event_paranoid(); |
a8f23d8f ACM |
1231 | |
1232 | printed += scnprintf(buf + printed, size - printed, "\nHint:\t"); | |
1233 | ||
1234 | if (value >= 2) { | |
1235 | printed += scnprintf(buf + printed, size - printed, | |
1236 | "For your workloads it needs to be <= 1\nHint:\t"); | |
1237 | } | |
1238 | printed += scnprintf(buf + printed, size - printed, | |
5229e366 | 1239 | "For system wide tracing it needs to be set to -1.\n"); |
a8f23d8f ACM |
1240 | |
1241 | printed += scnprintf(buf + printed, size - printed, | |
5229e366 ACM |
1242 | "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n" |
1243 | "Hint:\tThe current value is %d.", value); | |
a8f23d8f ACM |
1244 | break; |
1245 | default: | |
1246 | scnprintf(buf, size, "%s", emsg); | |
1247 | break; | |
1248 | } | |
1249 | ||
1250 | return 0; | |
1251 | } | |
a025e4f0 AH |
1252 | |
1253 | void perf_evlist__to_front(struct perf_evlist *evlist, | |
1254 | struct perf_evsel *move_evsel) | |
1255 | { | |
1256 | struct perf_evsel *evsel, *n; | |
1257 | LIST_HEAD(move); | |
1258 | ||
1259 | if (move_evsel == perf_evlist__first(evlist)) | |
1260 | return; | |
1261 | ||
0050f7aa | 1262 | evlist__for_each_safe(evlist, n, evsel) { |
a025e4f0 AH |
1263 | if (evsel->leader == move_evsel->leader) |
1264 | list_move_tail(&evsel->node, &move); | |
1265 | } | |
1266 | ||
1267 | list_splice(&move, &evlist->entries); | |
1268 | } |