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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) | |
cc2d86b0 SE |
88 | goto error; |
89 | ||
90 | /* use strdup() because free(evsel) assumes name is allocated */ | |
91 | evsel->name = strdup("cycles"); | |
92 | if (!evsel->name) | |
93 | goto error_free; | |
361c99a6 ACM |
94 | |
95 | perf_evlist__add(evlist, evsel); | |
96 | return 0; | |
cc2d86b0 SE |
97 | error_free: |
98 | perf_evsel__delete(evsel); | |
99 | error: | |
100 | return -ENOMEM; | |
361c99a6 | 101 | } |
5c581041 | 102 | |
4152ab37 ACM |
103 | void perf_evlist__disable(struct perf_evlist *evlist) |
104 | { | |
105 | int cpu, thread; | |
106 | struct perf_evsel *pos; | |
107 | ||
108 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
109 | list_for_each_entry(pos, &evlist->entries, node) { | |
110 | for (thread = 0; thread < evlist->threads->nr; thread++) | |
111 | ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_DISABLE); | |
112 | } | |
113 | } | |
114 | } | |
115 | ||
7e2ed097 | 116 | int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) |
5c581041 | 117 | { |
7e2ed097 | 118 | int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries; |
5c581041 ACM |
119 | evlist->pollfd = malloc(sizeof(struct pollfd) * nfds); |
120 | return evlist->pollfd != NULL ? 0 : -ENOMEM; | |
121 | } | |
70082dd9 ACM |
122 | |
123 | void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) | |
124 | { | |
125 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
126 | evlist->pollfd[evlist->nr_fds].fd = fd; | |
127 | evlist->pollfd[evlist->nr_fds].events = POLLIN; | |
128 | evlist->nr_fds++; | |
129 | } | |
70db7533 | 130 | |
a91e5431 ACM |
131 | static void perf_evlist__id_hash(struct perf_evlist *evlist, |
132 | struct perf_evsel *evsel, | |
133 | int cpu, int thread, u64 id) | |
3d3b5e95 ACM |
134 | { |
135 | int hash; | |
136 | struct perf_sample_id *sid = SID(evsel, cpu, thread); | |
137 | ||
138 | sid->id = id; | |
139 | sid->evsel = evsel; | |
140 | hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS); | |
141 | hlist_add_head(&sid->node, &evlist->heads[hash]); | |
142 | } | |
143 | ||
a91e5431 ACM |
144 | void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel, |
145 | int cpu, int thread, u64 id) | |
146 | { | |
147 | perf_evlist__id_hash(evlist, evsel, cpu, thread, id); | |
148 | evsel->id[evsel->ids++] = id; | |
149 | } | |
150 | ||
151 | static int perf_evlist__id_add_fd(struct perf_evlist *evlist, | |
152 | struct perf_evsel *evsel, | |
153 | int cpu, int thread, int fd) | |
f8a95309 | 154 | { |
f8a95309 | 155 | u64 read_data[4] = { 0, }; |
3d3b5e95 | 156 | int id_idx = 1; /* The first entry is the counter value */ |
f8a95309 ACM |
157 | |
158 | if (!(evsel->attr.read_format & PERF_FORMAT_ID) || | |
159 | read(fd, &read_data, sizeof(read_data)) == -1) | |
160 | return -1; | |
161 | ||
162 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) | |
163 | ++id_idx; | |
164 | if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) | |
165 | ++id_idx; | |
166 | ||
a91e5431 | 167 | perf_evlist__id_add(evlist, evsel, cpu, thread, read_data[id_idx]); |
f8a95309 ACM |
168 | return 0; |
169 | } | |
170 | ||
70db7533 ACM |
171 | struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id) |
172 | { | |
173 | struct hlist_head *head; | |
174 | struct hlist_node *pos; | |
175 | struct perf_sample_id *sid; | |
176 | int hash; | |
177 | ||
178 | if (evlist->nr_entries == 1) | |
179 | return list_entry(evlist->entries.next, struct perf_evsel, node); | |
180 | ||
181 | hash = hash_64(id, PERF_EVLIST__HLIST_BITS); | |
182 | head = &evlist->heads[hash]; | |
183 | ||
184 | hlist_for_each_entry(sid, pos, head, node) | |
185 | if (sid->id == id) | |
186 | return sid->evsel; | |
187 | return NULL; | |
188 | } | |
04391deb | 189 | |
aece948f | 190 | union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx) |
04391deb ACM |
191 | { |
192 | /* XXX Move this to perf.c, making it generally available */ | |
193 | unsigned int page_size = sysconf(_SC_PAGE_SIZE); | |
aece948f | 194 | struct perf_mmap *md = &evlist->mmap[idx]; |
04391deb ACM |
195 | unsigned int head = perf_mmap__read_head(md); |
196 | unsigned int old = md->prev; | |
197 | unsigned char *data = md->base + page_size; | |
8115d60c | 198 | union perf_event *event = NULL; |
04391deb | 199 | |
7bb41152 | 200 | if (evlist->overwrite) { |
04391deb | 201 | /* |
7bb41152 ACM |
202 | * If we're further behind than half the buffer, there's a chance |
203 | * the writer will bite our tail and mess up the samples under us. | |
204 | * | |
205 | * If we somehow ended up ahead of the head, we got messed up. | |
206 | * | |
207 | * In either case, truncate and restart at head. | |
04391deb | 208 | */ |
7bb41152 ACM |
209 | int diff = head - old; |
210 | if (diff > md->mask / 2 || diff < 0) { | |
211 | fprintf(stderr, "WARNING: failed to keep up with mmap data.\n"); | |
212 | ||
213 | /* | |
214 | * head points to a known good entry, start there. | |
215 | */ | |
216 | old = head; | |
217 | } | |
04391deb ACM |
218 | } |
219 | ||
220 | if (old != head) { | |
221 | size_t size; | |
222 | ||
8115d60c | 223 | event = (union perf_event *)&data[old & md->mask]; |
04391deb ACM |
224 | size = event->header.size; |
225 | ||
226 | /* | |
227 | * Event straddles the mmap boundary -- header should always | |
228 | * be inside due to u64 alignment of output. | |
229 | */ | |
230 | if ((old & md->mask) + size != ((old + size) & md->mask)) { | |
231 | unsigned int offset = old; | |
232 | unsigned int len = min(sizeof(*event), size), cpy; | |
233 | void *dst = &evlist->event_copy; | |
234 | ||
235 | do { | |
236 | cpy = min(md->mask + 1 - (offset & md->mask), len); | |
237 | memcpy(dst, &data[offset & md->mask], cpy); | |
238 | offset += cpy; | |
239 | dst += cpy; | |
240 | len -= cpy; | |
241 | } while (len); | |
242 | ||
243 | event = &evlist->event_copy; | |
244 | } | |
245 | ||
246 | old += size; | |
247 | } | |
248 | ||
249 | md->prev = old; | |
7bb41152 ACM |
250 | |
251 | if (!evlist->overwrite) | |
252 | perf_mmap__write_tail(md, old); | |
253 | ||
04391deb ACM |
254 | return event; |
255 | } | |
f8a95309 | 256 | |
7e2ed097 | 257 | void perf_evlist__munmap(struct perf_evlist *evlist) |
f8a95309 | 258 | { |
aece948f | 259 | int i; |
f8a95309 | 260 | |
aece948f ACM |
261 | for (i = 0; i < evlist->nr_mmaps; i++) { |
262 | if (evlist->mmap[i].base != NULL) { | |
263 | munmap(evlist->mmap[i].base, evlist->mmap_len); | |
264 | evlist->mmap[i].base = NULL; | |
f8a95309 ACM |
265 | } |
266 | } | |
aece948f ACM |
267 | |
268 | free(evlist->mmap); | |
269 | evlist->mmap = NULL; | |
f8a95309 ACM |
270 | } |
271 | ||
7e2ed097 | 272 | int perf_evlist__alloc_mmap(struct perf_evlist *evlist) |
f8a95309 | 273 | { |
aece948f ACM |
274 | evlist->nr_mmaps = evlist->cpus->nr; |
275 | if (evlist->cpus->map[0] == -1) | |
276 | evlist->nr_mmaps = evlist->threads->nr; | |
277 | evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); | |
f8a95309 ACM |
278 | return evlist->mmap != NULL ? 0 : -ENOMEM; |
279 | } | |
280 | ||
bccdaba0 | 281 | static int __perf_evlist__mmap(struct perf_evlist *evlist, |
aece948f | 282 | int idx, int prot, int mask, int fd) |
f8a95309 | 283 | { |
aece948f ACM |
284 | evlist->mmap[idx].prev = 0; |
285 | evlist->mmap[idx].mask = mask; | |
286 | evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot, | |
f8a95309 | 287 | MAP_SHARED, fd, 0); |
bccdaba0 | 288 | if (evlist->mmap[idx].base == MAP_FAILED) |
f8a95309 ACM |
289 | return -1; |
290 | ||
291 | perf_evlist__add_pollfd(evlist, fd); | |
292 | return 0; | |
293 | } | |
294 | ||
aece948f ACM |
295 | static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask) |
296 | { | |
297 | struct perf_evsel *evsel; | |
298 | int cpu, thread; | |
299 | ||
300 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
301 | int output = -1; | |
302 | ||
303 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
304 | list_for_each_entry(evsel, &evlist->entries, node) { | |
305 | int fd = FD(evsel, cpu, thread); | |
306 | ||
307 | if (output == -1) { | |
308 | output = fd; | |
bccdaba0 | 309 | if (__perf_evlist__mmap(evlist, cpu, |
aece948f ACM |
310 | prot, mask, output) < 0) |
311 | goto out_unmap; | |
312 | } else { | |
313 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) | |
314 | goto out_unmap; | |
315 | } | |
316 | ||
317 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
318 | perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0) | |
319 | goto out_unmap; | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
324 | return 0; | |
325 | ||
326 | out_unmap: | |
327 | for (cpu = 0; cpu < evlist->cpus->nr; cpu++) { | |
328 | if (evlist->mmap[cpu].base != NULL) { | |
329 | munmap(evlist->mmap[cpu].base, evlist->mmap_len); | |
330 | evlist->mmap[cpu].base = NULL; | |
331 | } | |
332 | } | |
333 | return -1; | |
334 | } | |
335 | ||
336 | static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask) | |
337 | { | |
338 | struct perf_evsel *evsel; | |
339 | int thread; | |
340 | ||
341 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
342 | int output = -1; | |
343 | ||
344 | list_for_each_entry(evsel, &evlist->entries, node) { | |
345 | int fd = FD(evsel, 0, thread); | |
346 | ||
347 | if (output == -1) { | |
348 | output = fd; | |
bccdaba0 | 349 | if (__perf_evlist__mmap(evlist, thread, |
aece948f ACM |
350 | prot, mask, output) < 0) |
351 | goto out_unmap; | |
352 | } else { | |
353 | if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0) | |
354 | goto out_unmap; | |
355 | } | |
356 | ||
357 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
358 | perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0) | |
359 | goto out_unmap; | |
360 | } | |
361 | } | |
362 | ||
363 | return 0; | |
364 | ||
365 | out_unmap: | |
366 | for (thread = 0; thread < evlist->threads->nr; thread++) { | |
367 | if (evlist->mmap[thread].base != NULL) { | |
368 | munmap(evlist->mmap[thread].base, evlist->mmap_len); | |
369 | evlist->mmap[thread].base = NULL; | |
370 | } | |
371 | } | |
372 | return -1; | |
373 | } | |
374 | ||
f8a95309 ACM |
375 | /** perf_evlist__mmap - Create per cpu maps to receive events |
376 | * | |
377 | * @evlist - list of events | |
f8a95309 ACM |
378 | * @pages - map length in pages |
379 | * @overwrite - overwrite older events? | |
380 | * | |
381 | * If overwrite is false the user needs to signal event consuption using: | |
382 | * | |
383 | * struct perf_mmap *m = &evlist->mmap[cpu]; | |
384 | * unsigned int head = perf_mmap__read_head(m); | |
385 | * | |
386 | * perf_mmap__write_tail(m, head) | |
7e2ed097 ACM |
387 | * |
388 | * Using perf_evlist__read_on_cpu does this automatically. | |
f8a95309 | 389 | */ |
7e2ed097 | 390 | int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite) |
f8a95309 ACM |
391 | { |
392 | unsigned int page_size = sysconf(_SC_PAGE_SIZE); | |
aece948f ACM |
393 | int mask = pages * page_size - 1; |
394 | struct perf_evsel *evsel; | |
7e2ed097 ACM |
395 | const struct cpu_map *cpus = evlist->cpus; |
396 | const struct thread_map *threads = evlist->threads; | |
aece948f | 397 | int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE); |
f8a95309 | 398 | |
7e2ed097 | 399 | if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0) |
f8a95309 ACM |
400 | return -ENOMEM; |
401 | ||
7e2ed097 | 402 | if (evlist->pollfd == NULL && perf_evlist__alloc_pollfd(evlist) < 0) |
f8a95309 ACM |
403 | return -ENOMEM; |
404 | ||
405 | evlist->overwrite = overwrite; | |
406 | evlist->mmap_len = (pages + 1) * page_size; | |
f8a95309 ACM |
407 | |
408 | list_for_each_entry(evsel, &evlist->entries, node) { | |
409 | if ((evsel->attr.read_format & PERF_FORMAT_ID) && | |
a91e5431 | 410 | evsel->sample_id == NULL && |
f8a95309 ACM |
411 | perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0) |
412 | return -ENOMEM; | |
f8a95309 ACM |
413 | } |
414 | ||
aece948f ACM |
415 | if (evlist->cpus->map[0] == -1) |
416 | return perf_evlist__mmap_per_thread(evlist, prot, mask); | |
f8a95309 | 417 | |
aece948f | 418 | return perf_evlist__mmap_per_cpu(evlist, prot, mask); |
f8a95309 | 419 | } |
7e2ed097 ACM |
420 | |
421 | int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid, | |
422 | pid_t target_tid, const char *cpu_list) | |
423 | { | |
424 | evlist->threads = thread_map__new(target_pid, target_tid); | |
425 | ||
426 | if (evlist->threads == NULL) | |
427 | return -1; | |
428 | ||
b9019418 | 429 | if (cpu_list == NULL && target_tid != -1) |
7e2ed097 ACM |
430 | evlist->cpus = cpu_map__dummy_new(); |
431 | else | |
432 | evlist->cpus = cpu_map__new(cpu_list); | |
433 | ||
434 | if (evlist->cpus == NULL) | |
435 | goto out_delete_threads; | |
436 | ||
437 | return 0; | |
438 | ||
439 | out_delete_threads: | |
440 | thread_map__delete(evlist->threads); | |
441 | return -1; | |
442 | } | |
443 | ||
444 | void perf_evlist__delete_maps(struct perf_evlist *evlist) | |
445 | { | |
446 | cpu_map__delete(evlist->cpus); | |
447 | thread_map__delete(evlist->threads); | |
448 | evlist->cpus = NULL; | |
449 | evlist->threads = NULL; | |
450 | } | |
0a102479 FW |
451 | |
452 | int perf_evlist__set_filters(struct perf_evlist *evlist) | |
453 | { | |
454 | const struct thread_map *threads = evlist->threads; | |
455 | const struct cpu_map *cpus = evlist->cpus; | |
456 | struct perf_evsel *evsel; | |
457 | char *filter; | |
458 | int thread; | |
459 | int cpu; | |
460 | int err; | |
461 | int fd; | |
462 | ||
463 | list_for_each_entry(evsel, &evlist->entries, node) { | |
464 | filter = evsel->filter; | |
465 | if (!filter) | |
466 | continue; | |
467 | for (cpu = 0; cpu < cpus->nr; cpu++) { | |
468 | for (thread = 0; thread < threads->nr; thread++) { | |
469 | fd = FD(evsel, cpu, thread); | |
470 | err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter); | |
471 | if (err) | |
472 | return err; | |
473 | } | |
474 | } | |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
74429964 | 479 | |
c2a70653 | 480 | bool perf_evlist__valid_sample_type(const struct perf_evlist *evlist) |
74429964 | 481 | { |
c2a70653 ACM |
482 | struct perf_evsel *pos, *first; |
483 | ||
484 | pos = first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
485 | ||
486 | list_for_each_entry_continue(pos, &evlist->entries, node) { | |
487 | if (first->attr.sample_type != pos->attr.sample_type) | |
488 | return false; | |
74429964 FW |
489 | } |
490 | ||
c2a70653 | 491 | return true; |
74429964 FW |
492 | } |
493 | ||
c2a70653 ACM |
494 | u64 perf_evlist__sample_type(const struct perf_evlist *evlist) |
495 | { | |
496 | struct perf_evsel *first; | |
497 | ||
498 | first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
499 | return first->attr.sample_type; | |
500 | } | |
501 | ||
502 | bool perf_evlist__valid_sample_id_all(const struct perf_evlist *evlist) | |
74429964 | 503 | { |
c2a70653 ACM |
504 | struct perf_evsel *pos, *first; |
505 | ||
506 | pos = first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
507 | ||
508 | list_for_each_entry_continue(pos, &evlist->entries, node) { | |
509 | if (first->attr.sample_id_all != pos->attr.sample_id_all) | |
510 | return false; | |
74429964 FW |
511 | } |
512 | ||
c2a70653 ACM |
513 | return true; |
514 | } | |
515 | ||
516 | bool perf_evlist__sample_id_all(const struct perf_evlist *evlist) | |
517 | { | |
518 | struct perf_evsel *first; | |
519 | ||
520 | first = list_entry(evlist->entries.next, struct perf_evsel, node); | |
521 | return first->attr.sample_id_all; | |
74429964 | 522 | } |