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Commit | Line | Data |
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7b2567c1 ACM |
1 | /* |
2 | * build-id.c | |
3 | * | |
4 | * build-id support | |
5 | * | |
6 | * Copyright (C) 2009, 2010 Red Hat Inc. | |
7 | * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com> | |
8 | */ | |
b36f19d5 ACM |
9 | #include "util.h" |
10 | #include <stdio.h> | |
7b2567c1 ACM |
11 | #include "build-id.h" |
12 | #include "event.h" | |
13 | #include "symbol.h" | |
14 | #include <linux/kernel.h> | |
591765fd | 15 | #include "debug.h" |
d20deb64 | 16 | #include "session.h" |
45694aa7 | 17 | #include "tool.h" |
e195fac8 NK |
18 | #include "header.h" |
19 | #include "vdso.h" | |
7b2567c1 | 20 | |
73c5d224 NK |
21 | |
22 | static bool no_buildid_cache; | |
23 | ||
54a3cf59 AV |
24 | int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, |
25 | union perf_event *event, | |
ef89325f | 26 | struct perf_sample *sample, |
54a3cf59 AV |
27 | struct perf_evsel *evsel __maybe_unused, |
28 | struct machine *machine) | |
7b2567c1 ACM |
29 | { |
30 | struct addr_location al; | |
31 | u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; | |
ef89325f | 32 | struct thread *thread = machine__findnew_thread(machine, sample->pid, |
13ce34df | 33 | sample->tid); |
7b2567c1 ACM |
34 | |
35 | if (thread == NULL) { | |
36 | pr_err("problem processing %d event, skipping it.\n", | |
37 | event->header.type); | |
38 | return -1; | |
39 | } | |
40 | ||
bb871a9c | 41 | thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->ip, &al); |
7b2567c1 ACM |
42 | |
43 | if (al.map != NULL) | |
44 | al.map->dso->hit = 1; | |
45 | ||
b91fc39f | 46 | thread__put(thread); |
7b2567c1 ACM |
47 | return 0; |
48 | } | |
49 | ||
1d037ca1 | 50 | static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, |
d20deb64 | 51 | union perf_event *event, |
1d037ca1 IT |
52 | struct perf_sample *sample |
53 | __maybe_unused, | |
743eb868 | 54 | struct machine *machine) |
591765fd | 55 | { |
314add6b AH |
56 | struct thread *thread = machine__findnew_thread(machine, |
57 | event->fork.pid, | |
58 | event->fork.tid); | |
591765fd | 59 | |
8115d60c ACM |
60 | dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, |
61 | event->fork.ppid, event->fork.ptid); | |
591765fd | 62 | |
b91fc39f | 63 | if (thread) { |
5e78c69b | 64 | machine__remove_thread(machine, thread); |
b91fc39f ACM |
65 | thread__put(thread); |
66 | } | |
591765fd ACM |
67 | |
68 | return 0; | |
69 | } | |
70 | ||
45694aa7 | 71 | struct perf_tool build_id__mark_dso_hit_ops = { |
7b2567c1 | 72 | .sample = build_id__mark_dso_hit, |
8115d60c | 73 | .mmap = perf_event__process_mmap, |
5c5e854b | 74 | .mmap2 = perf_event__process_mmap2, |
f62d3f0f | 75 | .fork = perf_event__process_fork, |
8115d60c | 76 | .exit = perf_event__exit_del_thread, |
299c3452 SE |
77 | .attr = perf_event__process_attr, |
78 | .build_id = perf_event__process_build_id, | |
1216b65c | 79 | .ordered_events = true, |
7b2567c1 | 80 | }; |
b36f19d5 | 81 | |
ebb296c2 JO |
82 | int build_id__sprintf(const u8 *build_id, int len, char *bf) |
83 | { | |
84 | char *bid = bf; | |
85 | const u8 *raw = build_id; | |
86 | int i; | |
87 | ||
88 | for (i = 0; i < len; ++i) { | |
89 | sprintf(bid, "%02x", *raw); | |
90 | ++raw; | |
91 | bid += 2; | |
92 | } | |
93 | ||
94 | return raw - build_id; | |
95 | } | |
96 | ||
0b5a7935 MH |
97 | int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) |
98 | { | |
99 | char notes[PATH_MAX]; | |
100 | u8 build_id[BUILD_ID_SIZE]; | |
101 | int ret; | |
102 | ||
103 | if (!root_dir) | |
104 | root_dir = ""; | |
105 | ||
106 | scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); | |
107 | ||
108 | ret = sysfs__read_build_id(notes, build_id, sizeof(build_id)); | |
109 | if (ret < 0) | |
110 | return ret; | |
111 | ||
112 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
113 | } | |
114 | ||
115 | int filename__sprintf_build_id(const char *pathname, char *sbuild_id) | |
116 | { | |
117 | u8 build_id[BUILD_ID_SIZE]; | |
118 | int ret; | |
119 | ||
120 | ret = filename__read_build_id(pathname, build_id, sizeof(build_id)); | |
121 | if (ret < 0) | |
122 | return ret; | |
123 | else if (ret != sizeof(build_id)) | |
124 | return -EINVAL; | |
125 | ||
126 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
127 | } | |
128 | ||
5cb113fd MH |
129 | /* asnprintf consolidates asprintf and snprintf */ |
130 | static int asnprintf(char **strp, size_t size, const char *fmt, ...) | |
131 | { | |
132 | va_list ap; | |
133 | int ret; | |
134 | ||
135 | if (!strp) | |
136 | return -EINVAL; | |
137 | ||
138 | va_start(ap, fmt); | |
139 | if (*strp) | |
140 | ret = vsnprintf(*strp, size, fmt, ap); | |
141 | else | |
142 | ret = vasprintf(strp, fmt, ap); | |
143 | va_end(ap); | |
144 | ||
145 | return ret; | |
146 | } | |
147 | ||
148 | static char *build_id__filename(const char *sbuild_id, char *bf, size_t size) | |
149 | { | |
150 | char *tmp = bf; | |
151 | int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, | |
152 | sbuild_id, sbuild_id + 2); | |
153 | if (ret < 0 || (tmp && size < (unsigned int)ret)) | |
154 | return NULL; | |
155 | return bf; | |
156 | } | |
157 | ||
3344996e | 158 | char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size) |
b36f19d5 | 159 | { |
d77fac7f | 160 | char build_id_hex[SBUILD_ID_SIZE]; |
b36f19d5 | 161 | |
c824c433 | 162 | if (!dso->has_build_id) |
b36f19d5 ACM |
163 | return NULL; |
164 | ||
c824c433 | 165 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex); |
5cb113fd | 166 | return build_id__filename(build_id_hex, bf, size); |
b36f19d5 | 167 | } |
e195fac8 NK |
168 | |
169 | #define dsos__for_each_with_build_id(pos, head) \ | |
170 | list_for_each_entry(pos, head, node) \ | |
171 | if (!pos->has_build_id) \ | |
172 | continue; \ | |
173 | else | |
174 | ||
175 | static int write_buildid(const char *name, size_t name_len, u8 *build_id, | |
176 | pid_t pid, u16 misc, int fd) | |
177 | { | |
178 | int err; | |
179 | struct build_id_event b; | |
180 | size_t len; | |
181 | ||
182 | len = name_len + 1; | |
183 | len = PERF_ALIGN(len, NAME_ALIGN); | |
184 | ||
185 | memset(&b, 0, sizeof(b)); | |
186 | memcpy(&b.build_id, build_id, BUILD_ID_SIZE); | |
187 | b.pid = pid; | |
188 | b.header.misc = misc; | |
189 | b.header.size = sizeof(b) + len; | |
190 | ||
191 | err = writen(fd, &b, sizeof(b)); | |
192 | if (err < 0) | |
193 | return err; | |
194 | ||
195 | return write_padded(fd, name, name_len + 1, len); | |
196 | } | |
197 | ||
3d39ac53 | 198 | static int machine__write_buildid_table(struct machine *machine, int fd) |
e195fac8 | 199 | { |
3d39ac53 | 200 | int err = 0; |
e195fac8 NK |
201 | char nm[PATH_MAX]; |
202 | struct dso *pos; | |
3d39ac53 ACM |
203 | u16 kmisc = PERF_RECORD_MISC_KERNEL, |
204 | umisc = PERF_RECORD_MISC_USER; | |
205 | ||
206 | if (!machine__is_host(machine)) { | |
207 | kmisc = PERF_RECORD_MISC_GUEST_KERNEL; | |
208 | umisc = PERF_RECORD_MISC_GUEST_USER; | |
209 | } | |
e195fac8 | 210 | |
3d39ac53 | 211 | dsos__for_each_with_build_id(pos, &machine->dsos.head) { |
e195fac8 NK |
212 | const char *name; |
213 | size_t name_len; | |
214 | ||
215 | if (!pos->hit) | |
216 | continue; | |
217 | ||
218 | if (dso__is_vdso(pos)) { | |
219 | name = pos->short_name; | |
220 | name_len = pos->short_name_len + 1; | |
221 | } else if (dso__is_kcore(pos)) { | |
222 | machine__mmap_name(machine, nm, sizeof(nm)); | |
223 | name = nm; | |
224 | name_len = strlen(nm) + 1; | |
225 | } else { | |
226 | name = pos->long_name; | |
227 | name_len = pos->long_name_len + 1; | |
228 | } | |
229 | ||
3d39ac53 ACM |
230 | err = write_buildid(name, name_len, pos->build_id, machine->pid, |
231 | pos->kernel ? kmisc : umisc, fd); | |
e195fac8 | 232 | if (err) |
3d39ac53 | 233 | break; |
e195fac8 NK |
234 | } |
235 | ||
e195fac8 NK |
236 | return err; |
237 | } | |
238 | ||
239 | int perf_session__write_buildid_table(struct perf_session *session, int fd) | |
240 | { | |
241 | struct rb_node *nd; | |
242 | int err = machine__write_buildid_table(&session->machines.host, fd); | |
243 | ||
244 | if (err) | |
245 | return err; | |
246 | ||
247 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
248 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
249 | err = machine__write_buildid_table(pos, fd); | |
250 | if (err) | |
251 | break; | |
252 | } | |
253 | return err; | |
254 | } | |
255 | ||
256 | static int __dsos__hit_all(struct list_head *head) | |
257 | { | |
258 | struct dso *pos; | |
259 | ||
260 | list_for_each_entry(pos, head, node) | |
261 | pos->hit = true; | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int machine__hit_all_dsos(struct machine *machine) | |
267 | { | |
3d39ac53 | 268 | return __dsos__hit_all(&machine->dsos.head); |
e195fac8 NK |
269 | } |
270 | ||
271 | int dsos__hit_all(struct perf_session *session) | |
272 | { | |
273 | struct rb_node *nd; | |
274 | int err; | |
275 | ||
276 | err = machine__hit_all_dsos(&session->machines.host); | |
277 | if (err) | |
278 | return err; | |
279 | ||
280 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
281 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
282 | ||
283 | err = machine__hit_all_dsos(pos); | |
284 | if (err) | |
285 | return err; | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
73c5d224 NK |
291 | void disable_buildid_cache(void) |
292 | { | |
293 | no_buildid_cache = true; | |
294 | } | |
295 | ||
8d8c8e4c MH |
296 | static char *build_id_cache__dirname_from_path(const char *name, |
297 | bool is_kallsyms, bool is_vdso) | |
298 | { | |
299 | char *realname = (char *)name, *filename; | |
300 | bool slash = is_kallsyms || is_vdso; | |
301 | ||
302 | if (!slash) { | |
303 | realname = realpath(name, NULL); | |
304 | if (!realname) | |
305 | return NULL; | |
306 | } | |
307 | ||
308 | if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "", | |
309 | is_vdso ? DSO__NAME_VDSO : realname) < 0) | |
310 | filename = NULL; | |
311 | ||
312 | if (!slash) | |
313 | free(realname); | |
314 | ||
315 | return filename; | |
316 | } | |
317 | ||
318 | int build_id_cache__list_build_ids(const char *pathname, | |
319 | struct strlist **result) | |
320 | { | |
321 | struct strlist *list; | |
322 | char *dir_name; | |
323 | DIR *dir; | |
324 | struct dirent *d; | |
325 | int ret = 0; | |
326 | ||
4a77e218 | 327 | list = strlist__new(NULL, NULL); |
8d8c8e4c MH |
328 | dir_name = build_id_cache__dirname_from_path(pathname, false, false); |
329 | if (!list || !dir_name) { | |
330 | ret = -ENOMEM; | |
331 | goto out; | |
332 | } | |
333 | ||
334 | /* List up all dirents */ | |
335 | dir = opendir(dir_name); | |
336 | if (!dir) { | |
337 | ret = -errno; | |
338 | goto out; | |
339 | } | |
340 | ||
341 | while ((d = readdir(dir)) != NULL) { | |
342 | if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) | |
343 | continue; | |
344 | strlist__add(list, d->d_name); | |
345 | } | |
346 | closedir(dir); | |
347 | ||
348 | out: | |
349 | free(dir_name); | |
350 | if (ret) | |
351 | strlist__delete(list); | |
352 | else | |
353 | *result = list; | |
354 | ||
355 | return ret; | |
356 | } | |
357 | ||
e35f7362 MH |
358 | int build_id_cache__add_s(const char *sbuild_id, const char *name, |
359 | bool is_kallsyms, bool is_vdso) | |
e195fac8 NK |
360 | { |
361 | const size_t size = PATH_MAX; | |
8d8c8e4c | 362 | char *realname = NULL, *filename = NULL, *dir_name = NULL, |
5cb113fd | 363 | *linkname = zalloc(size), *targetname, *tmp; |
8d8c8e4c | 364 | int err = -1; |
e195fac8 | 365 | |
8d8c8e4c | 366 | if (!is_kallsyms) { |
e195fac8 | 367 | realname = realpath(name, NULL); |
8d8c8e4c MH |
368 | if (!realname) |
369 | goto out_free; | |
370 | } | |
e195fac8 | 371 | |
8d8c8e4c MH |
372 | dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso); |
373 | if (!dir_name) | |
e195fac8 NK |
374 | goto out_free; |
375 | ||
8d8c8e4c | 376 | if (mkdir_p(dir_name, 0755)) |
e195fac8 NK |
377 | goto out_free; |
378 | ||
8d8c8e4c MH |
379 | if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) { |
380 | filename = NULL; | |
381 | goto out_free; | |
382 | } | |
e195fac8 NK |
383 | |
384 | if (access(filename, F_OK)) { | |
385 | if (is_kallsyms) { | |
386 | if (copyfile("/proc/kallsyms", filename)) | |
387 | goto out_free; | |
0635b0f7 MV |
388 | } else if (link(realname, filename) && errno != EEXIST && |
389 | copyfile(name, filename)) | |
e195fac8 NK |
390 | goto out_free; |
391 | } | |
392 | ||
5cb113fd MH |
393 | if (!build_id__filename(sbuild_id, linkname, size)) |
394 | goto out_free; | |
395 | tmp = strrchr(linkname, '/'); | |
396 | *tmp = '\0'; | |
e195fac8 NK |
397 | |
398 | if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) | |
399 | goto out_free; | |
400 | ||
5cb113fd | 401 | *tmp = '/'; |
e35f7362 | 402 | targetname = filename + strlen(buildid_dir) - 5; |
e195fac8 NK |
403 | memcpy(targetname, "../..", 5); |
404 | ||
405 | if (symlink(targetname, linkname) == 0) | |
406 | err = 0; | |
407 | out_free: | |
408 | if (!is_kallsyms) | |
409 | free(realname); | |
410 | free(filename); | |
8d8c8e4c | 411 | free(dir_name); |
e195fac8 NK |
412 | free(linkname); |
413 | return err; | |
414 | } | |
415 | ||
416 | static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size, | |
e35f7362 MH |
417 | const char *name, bool is_kallsyms, |
418 | bool is_vdso) | |
e195fac8 | 419 | { |
d77fac7f | 420 | char sbuild_id[SBUILD_ID_SIZE]; |
e195fac8 NK |
421 | |
422 | build_id__sprintf(build_id, build_id_size, sbuild_id); | |
423 | ||
e35f7362 | 424 | return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso); |
e195fac8 NK |
425 | } |
426 | ||
a50d11a1 MH |
427 | bool build_id_cache__cached(const char *sbuild_id) |
428 | { | |
429 | bool ret = false; | |
430 | char *filename = build_id__filename(sbuild_id, NULL, 0); | |
431 | ||
432 | if (filename && !access(filename, F_OK)) | |
433 | ret = true; | |
434 | free(filename); | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
e35f7362 | 439 | int build_id_cache__remove_s(const char *sbuild_id) |
e195fac8 NK |
440 | { |
441 | const size_t size = PATH_MAX; | |
442 | char *filename = zalloc(size), | |
5cb113fd | 443 | *linkname = zalloc(size), *tmp; |
e195fac8 NK |
444 | int err = -1; |
445 | ||
446 | if (filename == NULL || linkname == NULL) | |
447 | goto out_free; | |
448 | ||
5cb113fd MH |
449 | if (!build_id__filename(sbuild_id, linkname, size)) |
450 | goto out_free; | |
e195fac8 NK |
451 | |
452 | if (access(linkname, F_OK)) | |
453 | goto out_free; | |
454 | ||
455 | if (readlink(linkname, filename, size - 1) < 0) | |
456 | goto out_free; | |
457 | ||
458 | if (unlink(linkname)) | |
459 | goto out_free; | |
460 | ||
461 | /* | |
462 | * Since the link is relative, we must make it absolute: | |
463 | */ | |
5cb113fd MH |
464 | tmp = strrchr(linkname, '/') + 1; |
465 | snprintf(tmp, size - (tmp - linkname), "%s", filename); | |
e195fac8 NK |
466 | |
467 | if (unlink(linkname)) | |
468 | goto out_free; | |
469 | ||
470 | err = 0; | |
471 | out_free: | |
472 | free(filename); | |
473 | free(linkname); | |
474 | return err; | |
475 | } | |
476 | ||
e35f7362 | 477 | static int dso__cache_build_id(struct dso *dso, struct machine *machine) |
e195fac8 NK |
478 | { |
479 | bool is_kallsyms = dso->kernel && dso->long_name[0] != '/'; | |
480 | bool is_vdso = dso__is_vdso(dso); | |
481 | const char *name = dso->long_name; | |
482 | char nm[PATH_MAX]; | |
483 | ||
484 | if (dso__is_kcore(dso)) { | |
485 | is_kallsyms = true; | |
486 | machine__mmap_name(machine, nm, sizeof(nm)); | |
487 | name = nm; | |
488 | } | |
489 | return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name, | |
e35f7362 | 490 | is_kallsyms, is_vdso); |
e195fac8 NK |
491 | } |
492 | ||
493 | static int __dsos__cache_build_ids(struct list_head *head, | |
e35f7362 | 494 | struct machine *machine) |
e195fac8 NK |
495 | { |
496 | struct dso *pos; | |
497 | int err = 0; | |
498 | ||
499 | dsos__for_each_with_build_id(pos, head) | |
e35f7362 | 500 | if (dso__cache_build_id(pos, machine)) |
e195fac8 NK |
501 | err = -1; |
502 | ||
503 | return err; | |
504 | } | |
505 | ||
e35f7362 | 506 | static int machine__cache_build_ids(struct machine *machine) |
e195fac8 | 507 | { |
3d39ac53 | 508 | return __dsos__cache_build_ids(&machine->dsos.head, machine); |
e195fac8 NK |
509 | } |
510 | ||
511 | int perf_session__cache_build_ids(struct perf_session *session) | |
512 | { | |
513 | struct rb_node *nd; | |
514 | int ret; | |
e195fac8 | 515 | |
73c5d224 NK |
516 | if (no_buildid_cache) |
517 | return 0; | |
518 | ||
498922ad | 519 | if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) |
e195fac8 NK |
520 | return -1; |
521 | ||
e35f7362 | 522 | ret = machine__cache_build_ids(&session->machines.host); |
e195fac8 NK |
523 | |
524 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
525 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
e35f7362 | 526 | ret |= machine__cache_build_ids(pos); |
e195fac8 NK |
527 | } |
528 | return ret ? -1 : 0; | |
529 | } | |
530 | ||
531 | static bool machine__read_build_ids(struct machine *machine, bool with_hits) | |
532 | { | |
3d39ac53 | 533 | return __dsos__read_build_ids(&machine->dsos.head, with_hits); |
e195fac8 NK |
534 | } |
535 | ||
536 | bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) | |
537 | { | |
538 | struct rb_node *nd; | |
539 | bool ret = machine__read_build_ids(&session->machines.host, with_hits); | |
540 | ||
541 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
542 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
543 | ret |= machine__read_build_ids(pos, with_hits); | |
544 | } | |
545 | ||
546 | return ret; | |
547 | } |