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 | */ | |
5c581041 | 9 | #include <poll.h> |
f8a95309 ACM |
10 | #include "cpumap.h" |
11 | #include "thread_map.h" | |
361c99a6 ACM |
12 | #include "evlist.h" |
13 | #include "evsel.h" | |
14 | #include "util.h" | |
15 | ||
f8a95309 ACM |
16 | #include <sys/mman.h> |
17 | ||
70db7533 ACM |
18 | #include <linux/bitops.h> |
19 | #include <linux/hash.h> | |
20 | ||
f8a95309 | 21 | #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
a91e5431 | 22 | #define SID(e, x, y) xyarray__entry(e->sample_id, x, y) |
f8a95309 | 23 | |
7e2ed097 ACM |
24 | void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus, |
25 | struct thread_map *threads) | |
ef1d1af2 ACM |
26 | { |
27 | int i; | |
28 | ||
29 | for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i) | |
30 | INIT_HLIST_HEAD(&evlist->heads[i]); | |
31 | INIT_LIST_HEAD(&evlist->entries); | |
7e2ed097 | 32 | perf_evlist__set_maps(evlist, cpus, threads); |
ef1d1af2 ACM |
33 | } |
34 | ||
7e2ed097 ACM |
35 | struct perf_evlist *perf_evlist__new(struct cpu_map *cpus, |
36 | struct thread_map *threads) | |
361c99a6 ACM |
37 | { |
38 | struct perf_evlist *evlist = zalloc(sizeof(*evlist)); | |
39 | ||
ef1d1af2 | 40 | if (evlist != NULL) |
7e2ed097 | 41 | perf_evlist__init(evlist, cpus, threads); |
361c99a6 ACM |
42 | |
43 | return evlist; | |
44 | } | |
45 | ||
46 | static void perf_evlist__purge(struct perf_evlist *evlist) | |
47 | { | |
48 | struct perf_evsel *pos, *n; | |
49 | ||
50 | list_for_each_entry_safe(pos, n, &evlist->entries, node) { | |
51 | list_del_init(&pos->node); | |
52 | perf_evsel__delete(pos); | |
53 | } | |
54 | ||
55 | evlist->nr_entries = 0; | |
56 | } | |
57 | ||
ef1d1af2 | 58 | void perf_evlist__exit(struct perf_evlist *evlist) |
361c99a6 | 59 | { |
70db7533 | 60 | free(evlist->mmap); |
5c581041 | 61 | free(evlist->pollfd); |
ef1d1af2 ACM |
62 | evlist->mmap = NULL; |
63 | evlist->pollfd = NULL; | |
64 | } | |
65 | ||
66 | void perf_evlist__delete(struct perf_evlist *evlist) | |
67 | { | |
68 | perf_evlist__purge(evlist); | |
69 | perf_evlist__exit(evlist); | |
361c99a6 ACM |
70 | free(evlist); |
71 | } | |
72 | ||
73 | void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry) | |
74 | { | |
75 | list_add_tail(&entry->node, &evlist->entries); | |
76 | ++evlist->nr_entries; | |
77 | } | |
78 | ||
79 | int perf_evlist__add_default(struct perf_evlist *evlist) | |
80 | { | |
81 | struct perf_event_attr attr = { | |
82 | .type = PERF_TYPE_HARDWARE, | |
83 | .config = PERF_COUNT_HW_CPU_CYCLES, | |
84 | }; | |
85 | struct perf_evsel *evsel = perf_evsel__new(&attr, 0); | |
86 | ||
87 | if (evsel == NULL) | |
88 | return -ENOMEM; | |
89 | ||
90 | perf_evlist__add(evlist, evsel); | |
91 | return 0; | |
92 | } | |
5c581041 | 93 | |
4152ab37 ACM |
94 | void perf_evlist__disable(struct perf_evlist *evlist) |
95 | { | |
96 | int cpu, thread; | |
97 | struct perf_evsel *pos; | |
98 | ||
99 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
100 | list_for_each_entry(pos, &evlist->entries, node) { | |
101 | for (thread = 0; thread < evlist->threads->nr; thread++) | |
102 | ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_DISABLE); | |
103 | } | |
104 | } | |
105 | } | |
106 | ||
7e2ed097 | 107 | int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) |
5c581041 | 108 | { |
7e2ed097 | 109 | int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries; |
5c581041 ACM |
110 | evlist->pollfd = malloc(sizeof(struct pollfd) * nfds); |
111 | return evlist->pollfd != NULL ? 0 : -ENOMEM; | |
112 | } | |
70082dd9 ACM |
113 | |
114 | void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) | |
115 | { | |
116 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
117 | evlist->pollfd[evlist->nr_fds].fd = fd; | |
118 | evlist->pollfd[evlist->nr_fds].events = POLLIN; | |
119 | evlist->nr_fds++; | |
120 | } | |
70db7533 | 121 | |
a91e5431 ACM |
122 | static void perf_evlist__id_hash(struct perf_evlist *evlist, |
123 | struct perf_evsel *evsel, | |
124 | int cpu, int thread, u64 id) | |
3d3b5e95 ACM |
125 | { |
126 | int hash; | |
127 | struct perf_sample_id *sid = SID(evsel, cpu, thread); | |
128 | ||
129 | sid->id = id; | |
130 | sid->evsel = evsel; | |
131 | hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS); | |
132 | hlist_add_head(&sid->node, &evlist->heads[hash]); | |
133 | } | |
134 | ||
a91e5431 ACM |
135 | void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel, |
136 | int cpu, int thread, u64 id) | |
137 | { | |
138 | perf_evlist__id_hash(evlist, evsel, cpu, thread, id); | |
139 | evsel->id[evsel->ids++] = id; | |
140 | } | |
141 | ||
142 | static int perf_evlist__id_add_fd(struct perf_evlist *evlist, | |
143 | struct perf_evsel *evsel, | |
144 | int cpu, int thread, int fd) | |
f8a95309 | 145 | { |
f8a95309 | 146 | u64 read_data[4] = { 0, }; |
3d3b5e95 | 147 | int id_idx = 1; /* The first entry is the counter value */ |
f8a95309 ACM |
148 | |
149 | if (!(evsel->attr.read_format & PERF_FORMAT_ID) || | |
150 | read(fd, &read_data, sizeof(read_data)) == -1) | |
151 | return -1; | |
152 | ||
153 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) | |
154 | ++id_idx; | |
155 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) | |
156 | ++id_idx; | |
157 | ||
a91e5431 | 158 | perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]); |
f8a95309 ACM |
159 | return 0; |
160 | } | |
161 | ||
70db7533 ACM |
162 | struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id) |
163 | { | |
164 | struct hlist_head *head; | |
165 | struct hlist_node *pos; | |
166 | struct perf_sample_id *sid; | |
167 | int hash; | |
168 | ||
169 | if (evlist->nr_entries == 1) | |
170 | return list_entry(evlist->entries.next, struct perf_evsel, node); | |
171 | ||
172 | hash = hash_64(id, PERF_EVLIST__HLIST_BITS); | |
173 | head = &evlist->heads[hash]; | |
174 | ||
175 | hlist_for_each_entry(sid, pos, head, node) | |
176 | if (sid->id == id) | |
177 | return sid->evsel; | |
178 | return NULL; | |
179 | } | |
04391deb | 180 | |
aece948f | 181 | union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx) |
04391deb ACM |
182 | { |
183 | /* XXX Move this to perf.c, making it generally available */ | |
184 | unsigned int page_size = sysconf(_SC_PAGE_SIZE); | |
aece948f | 185 | struct perf_mmap *md = &evlist->mmap[idx]; |
04391deb ACM |
186 | unsigned int head = perf_mmap__read_head(md); |
187 | unsigned int old = md->prev; | |
188 | unsigned char *data = md->base + page_size; | |
8115d60c | 189 | union perf_event *event = NULL; |
04391deb | 190 | |
7bb41152 | 191 | if (evlist->overwrite) { |
04391deb | 192 | /* |
7bb41152 ACM |
193 | * If we're further behind than half the buffer, there's a chance |
194 | * the writer will bite our tail and mess up the samples under us. | |
195 | * | |
196 | * If we somehow ended up ahead of the head, we got messed up. | |
197 | * | |
198 | * In either case, truncate and restart at head. | |
04391deb | 199 | */ |
7bb41152 ACM |
200 | int diff = head - old; |
201 | if (diff > md->mask / 2 || diff < 0) { | |
202 | fprintf(stderr, "WARNING: failed to keep up with mmap data.\n"); | |
203 | ||
204 | /* | |
205 | * head points to a known good entry, start there. | |
206 | */ | |
207 | old = head; | |
208 | } | |
04391deb ACM |
209 | } |
210 | ||
211 | if (old != head) { | |
212 | size_t size; | |
213 | ||
8115d60c | 214 | event = (union perf_event *)&data[old & md->mask]; |
04391deb ACM |
215 | size = event->header.size; |
216 | ||
217 | /* | |
218 | * Event straddles the mmap boundary -- header should always | |
219 | * be inside due to u64 alignment of output. | |
220 | */ | |
221 | if ((old & md->mask) + size != ((old + size) & md->mask)) { | |
222 | unsigned int offset = old; | |
223 | unsigned int len = min(sizeof(*event), size), cpy; | |
224 | void *dst = &evlist->event_copy; | |
225 | ||
226 | do { | |
227 | cpy = min(md->mask + 1 - (offset & md->mask), len); | |
228 | memcpy(dst, &data[offset & md->mask], cpy); | |
229 | offset += cpy; | |
230 | dst += cpy; | |
231 | len -= cpy; | |
232 | } while (len); | |
233 | ||
234 | event = &evlist->event_copy; | |
235 | } | |
236 | ||
237 | old += size; | |
238 | } | |
239 | ||
240 | md->prev = old; | |
7bb41152 ACM |
241 | |
242 | if (!evlist->overwrite) | |
243 | perf_mmap__write_tail(md, old); | |
244 | ||
04391deb ACM |
245 | return event; |
246 | } | |
f8a95309 | 247 | |
7e2ed097 | 248 | void perf_evlist__munmap(struct perf_evlist *evlist) |
f8a95309 | 249 | { |
aece948f | 250 | int i; |
f8a95309 | 251 | |
aece948f ACM |
252 | for (i = 0; i < evlist->nr_mmaps; i++) { |
253 | if (evlist->mmap[i].base != NULL) { | |
254 | munmap(evlist->mmap[i].base, evlist->mmap_len); | |
255 | evlist->mmap[i].base = NULL; | |
f8a95309 ACM |
256 | } |
257 | } | |
aece948f ACM |
258 | |
259 | free(evlist->mmap); | |
260 | evlist->mmap = NULL; | |
f8a95309 ACM |
261 | } |
262 | ||
7e2ed097 | 263 | int perf_evlist__alloc_mmap(struct perf_evlist *evlist) |
f8a95309 | 264 | { |
aece948f ACM |
265 | evlist->nr_mmaps = evlist->cpus->nr; |
266 | if (evlist->cpus->map[0] == -1) | |
267 | evlist->nr_mmaps = evlist->threads->nr; | |
268 | evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); | |
f8a95309 ACM |
269 | return evlist->mmap != NULL ? 0 : -ENOMEM; |
270 | } | |
271 | ||
bccdaba0 | 272 | static int __perf_evlist__mmap(struct perf_evlist *evlist, |
aece948f | 273 | int idx, int prot, int mask, int fd) |
f8a95309 | 274 | { |
aece948f ACM |
275 | evlist->mmap[idx].prev = 0; |
276 | evlist->mmap[idx].mask = mask; | |
277 | evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot, | |
f8a95309 | 278 | MAP_SHARED, fd, 0); |
bccdaba0 | 279 | if (evlist->mmap[idx].base == MAP_FAILED) |
f8a95309 ACM |
280 | return -1; |
281 | ||
282 | perf_evlist__add_pollfd(evlist, fd); | |
283 | return 0; | |
284 | } | |
285 | ||
aece948f ACM |
286 | static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask) |
287 | { | |
288 | struct perf_evsel *evsel; | |
289 | int cpu, thread; | |
290 | ||
291 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
292 | int output = -1; | |
293 | ||
294 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
295 | list_for_each_entry(evsel, &evlist->entries, node) { | |
296 | int fd = FD(evsel, cpu, thread); | |
297 | ||
298 | if (output == -1) { | |
299 | output = fd; | |
bccdaba0 | 300 | if (__perf_evlist__mmap(evlist, cpu, |
aece948f ACM |
301 | prot, mask, output) < 0) |
302 | goto out_unmap; | |
303 | } else { | |
304 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) | |
305 | goto out_unmap; | |
306 | } | |
307 | ||
308 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
309 | perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0) | |
310 | goto out_unmap; | |
311 | } | |
312 | } | |
313 | } | |
314 | ||
315 | return 0; | |
316 | ||
317 | out_unmap: | |
318 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
319 | if (evlist->mmap[cpu].base != NULL) { | |
320 | munmap(evlist->mmap[cpu].base, evlist->mmap_len); | |
321 | evlist->mmap[cpu].base = NULL; | |
322 | } | |
323 | } | |
324 | return -1; | |
325 | } | |
326 | ||
327 | static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask) | |
328 | { | |
329 | struct perf_evsel *evsel; | |
330 | int thread; | |
331 | ||
332 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
333 | int output = -1; | |
334 | ||
335 | list_for_each_entry(evsel, &evlist->entries, node) { | |
336 | int fd = FD(evsel, 0, thread); | |
337 | ||
338 | if (output == -1) { | |
339 | output = fd; | |
bccdaba0 | 340 | if (__perf_evlist__mmap(evlist, thread, |
aece948f ACM |
341 | prot, mask, output) < 0) |
342 | goto out_unmap; | |
343 | } else { | |
344 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) | |
345 | goto out_unmap; | |
346 | } | |
347 | ||
348 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
349 | perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0) | |
350 | goto out_unmap; | |
351 | } | |
352 | } | |
353 | ||
354 | return 0; | |
355 | ||
356 | out_unmap: | |
357 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
358 | if (evlist->mmap[thread].base != NULL) { | |
359 | munmap(evlist->mmap[thread].base, evlist->mmap_len); | |
360 | evlist->mmap[thread].base = NULL; | |
361 | } | |
362 | } | |
363 | return -1; | |
364 | } | |
365 | ||
f8a95309 ACM |
366 | /** perf_evlist__mmap - Create per cpu maps to receive events |
367 | * | |
368 | * @evlist - list of events | |
f8a95309 ACM |
369 | * @pages - map length in pages |
370 | * @overwrite - overwrite older events? | |
371 | * | |
372 | * If overwrite is false the user needs to signal event consuption using: | |
373 | * | |
374 | * struct perf_mmap *m = &evlist->mmap[cpu]; | |
375 | * unsigned int head = perf_mmap__read_head(m); | |
376 | * | |
377 | * perf_mmap__write_tail(m, head) | |
7e2ed097 ACM |
378 | * |
379 | * Using perf_evlist__read_on_cpu does this automatically. | |
f8a95309 | 380 | */ |
7e2ed097 | 381 | int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite) |
f8a95309 ACM |
382 | { |
383 | unsigned int page_size = sysconf(_SC_PAGE_SIZE); | |
aece948f ACM |
384 | int mask = pages * page_size - 1; |
385 | struct perf_evsel *evsel; | |
7e2ed097 ACM |
386 | const struct cpu_map *cpus = evlist->cpus; |
387 | const struct thread_map *threads = evlist->threads; | |
aece948f | 388 | int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE); |
f8a95309 | 389 | |
7e2ed097 | 390 | if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) |
f8a95309 ACM |
391 | return -ENOMEM; |
392 | ||
7e2ed097 | 393 | if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0) |
f8a95309 ACM |
394 | return -ENOMEM; |
395 | ||
396 | evlist->overwrite = overwrite; | |
397 | evlist->mmap_len = (pages + 1) * page_size; | |
f8a95309 ACM |
398 | |
399 | list_for_each_entry(evsel, &evlist->entries, node) { | |
400 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
a91e5431 | 401 | evsel->sample_id == NULL && |
f8a95309 ACM |
402 | perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0) |
403 | return -ENOMEM; | |
f8a95309 ACM |
404 | } |
405 | ||
aece948f ACM |
406 | if (evlist->cpus->map[0] == -1) |
407 | return perf_evlist__mmap_per_thread(evlist, prot, mask); | |
f8a95309 | 408 | |
aece948f | 409 | return perf_evlist__mmap_per_cpu(evlist, prot, mask); |
f8a95309 | 410 | } |
7e2ed097 ACM |
411 | |
412 | int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid, | |
413 | pid_t target_tid, const char *cpu_list) | |
414 | { | |
415 | evlist->threads = thread_map__new(target_pid, target_tid); | |
416 | ||
417 | if (evlist->threads == NULL) | |
418 | return -1; | |
419 | ||
b9019418 | 420 | if (cpu_list == NULL && target_tid != -1) |
7e2ed097 ACM |
421 | evlist->cpus = cpu_map__dummy_new(); |
422 | else | |
423 | evlist->cpus = cpu_map__new(cpu_list); | |
424 | ||
425 | if (evlist->cpus == NULL) | |
426 | goto out_delete_threads; | |
427 | ||
428 | return 0; | |
429 | ||
430 | out_delete_threads: | |
431 | thread_map__delete(evlist->threads); | |
432 | return -1; | |
433 | } | |
434 | ||
435 | void perf_evlist__delete_maps(struct perf_evlist *evlist) | |
436 | { | |
437 | cpu_map__delete(evlist->cpus); | |
438 | thread_map__delete(evlist->threads); | |
439 | evlist->cpus = NULL; | |
440 | evlist->threads = NULL; | |
441 | } | |
0a102479 FW |
442 | |
443 | int perf_evlist__set_filters(struct perf_evlist *evlist) | |
444 | { | |
445 | const struct thread_map *threads = evlist->threads; | |
446 | const struct cpu_map *cpus = evlist->cpus; | |
447 | struct perf_evsel *evsel; | |
448 | char *filter; | |
449 | int thread; | |
450 | int cpu; | |
451 | int err; | |
452 | int fd; | |
453 | ||
454 | list_for_each_entry(evsel, &evlist->entries, node) { | |
455 | filter = evsel->filter; | |
456 | if (!filter) | |
457 | continue; | |
458 | for (cpu = 0; cpu < cpus->nr; cpu++) { | |
459 | for (thread = 0; thread < threads->nr; thread++) { | |
460 | fd = FD(evsel, cpu, thread); | |
461 | err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter); | |
462 | if (err) | |
463 | return err; | |
464 | } | |
465 | } | |
466 | } | |
467 | ||
468 | return 0; | |
469 | } | |
74429964 | 470 | |
c2a70653 | 471 | bool perf_evlist__valid_sample_type(const struct perf_evlist *evlist) |
74429964 | 472 | { |
c2a70653 ACM |
473 | struct perf_evsel *pos, *first; |
474 | ||
475 | pos = first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
476 | ||
477 | list_for_each_entry_continue(pos, &evlist->entries, node) { | |
478 | if (first->attr.sample_type != pos->attr.sample_type) | |
479 | return false; | |
74429964 FW |
480 | } |
481 | ||
c2a70653 | 482 | return true; |
74429964 FW |
483 | } |
484 | ||
c2a70653 ACM |
485 | u64 perf_evlist__sample_type(const struct perf_evlist *evlist) |
486 | { | |
487 | struct perf_evsel *first; | |
488 | ||
489 | first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
490 | return first->attr.sample_type; | |
491 | } | |
492 | ||
493 | bool perf_evlist__valid_sample_id_all(const struct perf_evlist *evlist) | |
74429964 | 494 | { |
c2a70653 ACM |
495 | struct perf_evsel *pos, *first; |
496 | ||
497 | pos = first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
498 | ||
499 | list_for_each_entry_continue(pos, &evlist->entries, node) { | |
500 | if (first->attr.sample_id_all != pos->attr.sample_id_all) | |
501 | return false; | |
74429964 FW |
502 | } |
503 | ||
c2a70653 ACM |
504 | return true; |
505 | } | |
506 | ||
507 | bool perf_evlist__sample_id_all(const struct perf_evlist *evlist) | |
508 | { | |
509 | struct perf_evsel *first; | |
510 | ||
511 | first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
512 | return first->attr.sample_id_all; | |
74429964 | 513 | } |