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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" | |
6430a94e | 20 | #include "probe-file.h" |
7b2567c1 | 21 | |
73c5d224 NK |
22 | |
23 | static bool no_buildid_cache; | |
24 | ||
54a3cf59 AV |
25 | int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, |
26 | union perf_event *event, | |
ef89325f | 27 | struct perf_sample *sample, |
54a3cf59 AV |
28 | struct perf_evsel *evsel __maybe_unused, |
29 | struct machine *machine) | |
7b2567c1 ACM |
30 | { |
31 | struct addr_location al; | |
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 | ||
473398a2 | 41 | thread__find_addr_map(thread, sample->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 | ||
7375e151 | 94 | return (bid - bf) + 1; |
ebb296c2 JO |
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 | ||
01412261 MH |
148 | char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, |
149 | size_t size) | |
150 | { | |
01412261 MH |
151 | bool retry_old = true; |
152 | ||
c58c49ac WN |
153 | snprintf(bf, size, "%s/%s/%s/kallsyms", |
154 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
155 | retry: |
156 | if (!access(bf, F_OK)) | |
157 | return bf; | |
01412261 MH |
158 | if (retry_old) { |
159 | /* Try old style kallsyms cache */ | |
c58c49ac WN |
160 | snprintf(bf, size, "%s/%s/%s", |
161 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
162 | retry_old = false; |
163 | goto retry; | |
164 | } | |
165 | ||
166 | return NULL; | |
167 | } | |
168 | ||
1f3736c9 | 169 | char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) |
5cb113fd MH |
170 | { |
171 | char *tmp = bf; | |
172 | int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, | |
173 | sbuild_id, sbuild_id + 2); | |
174 | if (ret < 0 || (tmp && size < (unsigned int)ret)) | |
175 | return NULL; | |
176 | return bf; | |
177 | } | |
178 | ||
1f3736c9 MH |
179 | char *build_id_cache__origname(const char *sbuild_id) |
180 | { | |
181 | char *linkname; | |
182 | char buf[PATH_MAX]; | |
183 | char *ret = NULL, *p; | |
184 | size_t offs = 5; /* == strlen("../..") */ | |
5a234211 | 185 | ssize_t len; |
1f3736c9 MH |
186 | |
187 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
188 | if (!linkname) | |
189 | return NULL; | |
190 | ||
5a234211 TR |
191 | len = readlink(linkname, buf, sizeof(buf) - 1); |
192 | if (len <= 0) | |
1f3736c9 | 193 | goto out; |
5a234211 TR |
194 | buf[len] = '\0'; |
195 | ||
1f3736c9 MH |
196 | /* The link should be "../..<origpath>/<sbuild_id>" */ |
197 | p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ | |
198 | if (p && (p > buf + offs)) { | |
199 | *p = '\0'; | |
200 | if (buf[offs + 1] == '[') | |
201 | offs++; /* | |
202 | * This is a DSO name, like [kernel.kallsyms]. | |
203 | * Skip the first '/', since this is not the | |
204 | * cache of a regular file. | |
205 | */ | |
206 | ret = strdup(buf + offs); /* Skip "../..[/]" */ | |
207 | } | |
208 | out: | |
209 | free(linkname); | |
210 | return ret; | |
211 | } | |
212 | ||
c3492a3a MH |
213 | /* Check if the given build_id cache is valid on current running system */ |
214 | static bool build_id_cache__valid_id(char *sbuild_id) | |
215 | { | |
216 | char real_sbuild_id[SBUILD_ID_SIZE] = ""; | |
217 | char *pathname; | |
218 | int ret = 0; | |
219 | bool result = false; | |
220 | ||
221 | pathname = build_id_cache__origname(sbuild_id); | |
222 | if (!pathname) | |
223 | return false; | |
224 | ||
225 | if (!strcmp(pathname, DSO__NAME_KALLSYMS)) | |
226 | ret = sysfs__sprintf_build_id("/", real_sbuild_id); | |
227 | else if (pathname[0] == '/') | |
228 | ret = filename__sprintf_build_id(pathname, real_sbuild_id); | |
229 | else | |
230 | ret = -EINVAL; /* Should we support other special DSO cache? */ | |
231 | if (ret >= 0) | |
232 | result = (strcmp(sbuild_id, real_sbuild_id) == 0); | |
233 | free(pathname); | |
234 | ||
235 | return result; | |
236 | } | |
237 | ||
01412261 MH |
238 | static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso) |
239 | { | |
240 | return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf"); | |
241 | } | |
242 | ||
3344996e | 243 | char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size) |
b36f19d5 | 244 | { |
01412261 MH |
245 | bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); |
246 | bool is_vdso = dso__is_vdso((struct dso *)dso); | |
247 | char sbuild_id[SBUILD_ID_SIZE]; | |
248 | char *linkname; | |
249 | bool alloc = (bf == NULL); | |
250 | int ret; | |
b36f19d5 | 251 | |
c824c433 | 252 | if (!dso->has_build_id) |
b36f19d5 ACM |
253 | return NULL; |
254 | ||
01412261 MH |
255 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); |
256 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
257 | if (!linkname) | |
258 | return NULL; | |
259 | ||
260 | /* Check if old style build_id cache */ | |
261 | if (is_regular_file(linkname)) | |
262 | ret = asnprintf(&bf, size, "%s", linkname); | |
263 | else | |
264 | ret = asnprintf(&bf, size, "%s/%s", linkname, | |
265 | build_id_cache__basename(is_kallsyms, is_vdso)); | |
266 | if (ret < 0 || (!alloc && size < (unsigned int)ret)) | |
267 | bf = NULL; | |
268 | free(linkname); | |
269 | ||
270 | return bf; | |
b36f19d5 | 271 | } |
e195fac8 | 272 | |
e7ee4047 WN |
273 | bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size) |
274 | { | |
01412261 | 275 | char *id_name = NULL, *ch; |
e7ee4047 | 276 | struct stat sb; |
01412261 MH |
277 | char sbuild_id[SBUILD_ID_SIZE]; |
278 | ||
279 | if (!dso->has_build_id) | |
280 | goto err; | |
e7ee4047 | 281 | |
01412261 MH |
282 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); |
283 | id_name = build_id_cache__linkname(sbuild_id, NULL, 0); | |
e7ee4047 WN |
284 | if (!id_name) |
285 | goto err; | |
286 | if (access(id_name, F_OK)) | |
287 | goto err; | |
288 | if (lstat(id_name, &sb) == -1) | |
289 | goto err; | |
290 | if ((size_t)sb.st_size > size - 1) | |
291 | goto err; | |
292 | if (readlink(id_name, bf, size - 1) < 0) | |
293 | goto err; | |
294 | ||
295 | bf[sb.st_size] = '\0'; | |
296 | ||
297 | /* | |
298 | * link should be: | |
299 | * ../../lib/modules/4.4.0-rc4/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko/a09fe3eb3147dafa4e3b31dbd6257e4d696bdc92 | |
300 | */ | |
301 | ch = strrchr(bf, '/'); | |
302 | if (!ch) | |
303 | goto err; | |
304 | if (ch - 3 < bf) | |
305 | goto err; | |
306 | ||
01412261 | 307 | free(id_name); |
e7ee4047 WN |
308 | return strncmp(".ko", ch - 3, 3) == 0; |
309 | err: | |
e7ee4047 WN |
310 | pr_err("Invalid build id: %s\n", id_name ? : |
311 | dso->long_name ? : | |
312 | dso->short_name ? : | |
313 | "[unknown]"); | |
01412261 | 314 | free(id_name); |
e7ee4047 WN |
315 | return false; |
316 | } | |
317 | ||
e195fac8 NK |
318 | #define dsos__for_each_with_build_id(pos, head) \ |
319 | list_for_each_entry(pos, head, node) \ | |
320 | if (!pos->has_build_id) \ | |
321 | continue; \ | |
322 | else | |
323 | ||
324 | static int write_buildid(const char *name, size_t name_len, u8 *build_id, | |
325 | pid_t pid, u16 misc, int fd) | |
326 | { | |
327 | int err; | |
328 | struct build_id_event b; | |
329 | size_t len; | |
330 | ||
331 | len = name_len + 1; | |
332 | len = PERF_ALIGN(len, NAME_ALIGN); | |
333 | ||
334 | memset(&b, 0, sizeof(b)); | |
335 | memcpy(&b.build_id, build_id, BUILD_ID_SIZE); | |
336 | b.pid = pid; | |
337 | b.header.misc = misc; | |
338 | b.header.size = sizeof(b) + len; | |
339 | ||
340 | err = writen(fd, &b, sizeof(b)); | |
341 | if (err < 0) | |
342 | return err; | |
343 | ||
344 | return write_padded(fd, name, name_len + 1, len); | |
345 | } | |
346 | ||
3d39ac53 | 347 | static int machine__write_buildid_table(struct machine *machine, int fd) |
e195fac8 | 348 | { |
3d39ac53 | 349 | int err = 0; |
e195fac8 NK |
350 | char nm[PATH_MAX]; |
351 | struct dso *pos; | |
3d39ac53 ACM |
352 | u16 kmisc = PERF_RECORD_MISC_KERNEL, |
353 | umisc = PERF_RECORD_MISC_USER; | |
354 | ||
355 | if (!machine__is_host(machine)) { | |
356 | kmisc = PERF_RECORD_MISC_GUEST_KERNEL; | |
357 | umisc = PERF_RECORD_MISC_GUEST_USER; | |
358 | } | |
e195fac8 | 359 | |
3d39ac53 | 360 | dsos__for_each_with_build_id(pos, &machine->dsos.head) { |
e195fac8 NK |
361 | const char *name; |
362 | size_t name_len; | |
fd786fac | 363 | bool in_kernel = false; |
e195fac8 | 364 | |
6ae98ba6 | 365 | if (!pos->hit && !dso__is_vdso(pos)) |
e195fac8 NK |
366 | continue; |
367 | ||
368 | if (dso__is_vdso(pos)) { | |
369 | name = pos->short_name; | |
70a2cba9 | 370 | name_len = pos->short_name_len; |
e195fac8 NK |
371 | } else if (dso__is_kcore(pos)) { |
372 | machine__mmap_name(machine, nm, sizeof(nm)); | |
373 | name = nm; | |
70a2cba9 | 374 | name_len = strlen(nm); |
e195fac8 NK |
375 | } else { |
376 | name = pos->long_name; | |
70a2cba9 | 377 | name_len = pos->long_name_len; |
e195fac8 NK |
378 | } |
379 | ||
fd786fac WN |
380 | in_kernel = pos->kernel || |
381 | is_kernel_module(name, | |
382 | PERF_RECORD_MISC_CPUMODE_UNKNOWN); | |
3d39ac53 | 383 | err = write_buildid(name, name_len, pos->build_id, machine->pid, |
fd786fac | 384 | in_kernel ? kmisc : umisc, fd); |
e195fac8 | 385 | if (err) |
3d39ac53 | 386 | break; |
e195fac8 NK |
387 | } |
388 | ||
e195fac8 NK |
389 | return err; |
390 | } | |
391 | ||
392 | int perf_session__write_buildid_table(struct perf_session *session, int fd) | |
393 | { | |
394 | struct rb_node *nd; | |
395 | int err = machine__write_buildid_table(&session->machines.host, fd); | |
396 | ||
397 | if (err) | |
398 | return err; | |
399 | ||
400 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
401 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
402 | err = machine__write_buildid_table(pos, fd); | |
403 | if (err) | |
404 | break; | |
405 | } | |
406 | return err; | |
407 | } | |
408 | ||
409 | static int __dsos__hit_all(struct list_head *head) | |
410 | { | |
411 | struct dso *pos; | |
412 | ||
413 | list_for_each_entry(pos, head, node) | |
414 | pos->hit = true; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | static int machine__hit_all_dsos(struct machine *machine) | |
420 | { | |
3d39ac53 | 421 | return __dsos__hit_all(&machine->dsos.head); |
e195fac8 NK |
422 | } |
423 | ||
424 | int dsos__hit_all(struct perf_session *session) | |
425 | { | |
426 | struct rb_node *nd; | |
427 | int err; | |
428 | ||
429 | err = machine__hit_all_dsos(&session->machines.host); | |
430 | if (err) | |
431 | return err; | |
432 | ||
433 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
434 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
435 | ||
436 | err = machine__hit_all_dsos(pos); | |
437 | if (err) | |
438 | return err; | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
73c5d224 NK |
444 | void disable_buildid_cache(void) |
445 | { | |
446 | no_buildid_cache = true; | |
447 | } | |
448 | ||
1f3736c9 MH |
449 | static bool lsdir_bid_head_filter(const char *name __maybe_unused, |
450 | struct dirent *d __maybe_unused) | |
451 | { | |
452 | return (strlen(d->d_name) == 2) && | |
453 | isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); | |
454 | } | |
455 | ||
456 | static bool lsdir_bid_tail_filter(const char *name __maybe_unused, | |
457 | struct dirent *d __maybe_unused) | |
458 | { | |
459 | int i = 0; | |
460 | while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) | |
461 | i++; | |
462 | return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0'); | |
463 | } | |
464 | ||
c3492a3a | 465 | struct strlist *build_id_cache__list_all(bool validonly) |
1f3736c9 MH |
466 | { |
467 | struct strlist *toplist, *linklist = NULL, *bidlist; | |
468 | struct str_node *nd, *nd2; | |
469 | char *topdir, *linkdir = NULL; | |
470 | char sbuild_id[SBUILD_ID_SIZE]; | |
471 | ||
c3492a3a MH |
472 | /* for filename__ functions */ |
473 | if (validonly) | |
474 | symbol__init(NULL); | |
475 | ||
1f3736c9 MH |
476 | /* Open the top-level directory */ |
477 | if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) | |
478 | return NULL; | |
479 | ||
480 | bidlist = strlist__new(NULL, NULL); | |
481 | if (!bidlist) | |
482 | goto out; | |
483 | ||
484 | toplist = lsdir(topdir, lsdir_bid_head_filter); | |
485 | if (!toplist) { | |
486 | pr_debug("Error in lsdir(%s): %d\n", topdir, errno); | |
487 | /* If there is no buildid cache, return an empty list */ | |
488 | if (errno == ENOENT) | |
489 | goto out; | |
490 | goto err_out; | |
491 | } | |
492 | ||
493 | strlist__for_each_entry(nd, toplist) { | |
494 | if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) | |
495 | goto err_out; | |
496 | /* Open the lower-level directory */ | |
497 | linklist = lsdir(linkdir, lsdir_bid_tail_filter); | |
498 | if (!linklist) { | |
499 | pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); | |
500 | goto err_out; | |
501 | } | |
502 | strlist__for_each_entry(nd2, linklist) { | |
503 | if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", | |
504 | nd->s, nd2->s) != SBUILD_ID_SIZE - 1) | |
505 | goto err_out; | |
c3492a3a MH |
506 | if (validonly && !build_id_cache__valid_id(sbuild_id)) |
507 | continue; | |
1f3736c9 MH |
508 | if (strlist__add(bidlist, sbuild_id) < 0) |
509 | goto err_out; | |
510 | } | |
511 | strlist__delete(linklist); | |
512 | zfree(&linkdir); | |
513 | } | |
514 | ||
515 | out_free: | |
516 | strlist__delete(toplist); | |
517 | out: | |
518 | free(topdir); | |
519 | ||
520 | return bidlist; | |
521 | ||
522 | err_out: | |
523 | strlist__delete(linklist); | |
524 | zfree(&linkdir); | |
525 | strlist__delete(bidlist); | |
526 | bidlist = NULL; | |
527 | goto out_free; | |
528 | } | |
529 | ||
a598180a MH |
530 | static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) |
531 | { | |
532 | size_t i; | |
533 | ||
534 | for (i = 0; i < len; i++) { | |
535 | if (!isxdigit(maybe_sbuild_id[i])) | |
536 | return false; | |
537 | } | |
538 | return true; | |
539 | } | |
540 | ||
541 | /* Return the valid complete build-id */ | |
542 | char *build_id_cache__complement(const char *incomplete_sbuild_id) | |
543 | { | |
544 | struct strlist *bidlist; | |
545 | struct str_node *nd, *cand = NULL; | |
546 | char *sbuild_id = NULL; | |
547 | size_t len = strlen(incomplete_sbuild_id); | |
548 | ||
549 | if (len >= SBUILD_ID_SIZE || | |
550 | !str_is_build_id(incomplete_sbuild_id, len)) | |
551 | return NULL; | |
552 | ||
553 | bidlist = build_id_cache__list_all(true); | |
554 | if (!bidlist) | |
555 | return NULL; | |
556 | ||
557 | strlist__for_each_entry(nd, bidlist) { | |
558 | if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) | |
559 | continue; | |
560 | if (cand) { /* Error: There are more than 2 candidates. */ | |
561 | cand = NULL; | |
562 | break; | |
563 | } | |
564 | cand = nd; | |
565 | } | |
566 | if (cand) | |
567 | sbuild_id = strdup(cand->s); | |
568 | strlist__delete(bidlist); | |
569 | ||
570 | return sbuild_id; | |
571 | } | |
572 | ||
4698b8b7 MH |
573 | char *build_id_cache__cachedir(const char *sbuild_id, const char *name, |
574 | bool is_kallsyms, bool is_vdso) | |
8d8c8e4c MH |
575 | { |
576 | char *realname = (char *)name, *filename; | |
577 | bool slash = is_kallsyms || is_vdso; | |
578 | ||
579 | if (!slash) { | |
580 | realname = realpath(name, NULL); | |
581 | if (!realname) | |
582 | return NULL; | |
583 | } | |
584 | ||
01412261 MH |
585 | if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", |
586 | is_vdso ? DSO__NAME_VDSO : realname, | |
587 | sbuild_id ? "/" : "", sbuild_id ?: "") < 0) | |
8d8c8e4c MH |
588 | filename = NULL; |
589 | ||
590 | if (!slash) | |
591 | free(realname); | |
592 | ||
593 | return filename; | |
594 | } | |
595 | ||
596 | int build_id_cache__list_build_ids(const char *pathname, | |
597 | struct strlist **result) | |
598 | { | |
8d8c8e4c | 599 | char *dir_name; |
8d8c8e4c MH |
600 | int ret = 0; |
601 | ||
4698b8b7 | 602 | dir_name = build_id_cache__cachedir(NULL, pathname, false, false); |
d65444d2 MH |
603 | if (!dir_name) |
604 | return -ENOMEM; | |
8d8c8e4c | 605 | |
d65444d2 MH |
606 | *result = lsdir(dir_name, lsdir_no_dot_filter); |
607 | if (!*result) | |
8d8c8e4c | 608 | ret = -errno; |
8d8c8e4c | 609 | free(dir_name); |
8d8c8e4c MH |
610 | |
611 | return ret; | |
612 | } | |
613 | ||
1c1a3a47 | 614 | #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) |
6430a94e MH |
615 | static int build_id_cache__add_sdt_cache(const char *sbuild_id, |
616 | const char *realname) | |
617 | { | |
618 | struct probe_cache *cache; | |
619 | int ret; | |
620 | ||
621 | cache = probe_cache__new(sbuild_id); | |
622 | if (!cache) | |
623 | return -1; | |
624 | ||
625 | ret = probe_cache__scan_sdt(cache, realname); | |
626 | if (ret >= 0) { | |
f9655200 | 627 | pr_debug4("Found %d SDTs in %s\n", ret, realname); |
6430a94e MH |
628 | if (probe_cache__commit(cache) < 0) |
629 | ret = -1; | |
630 | } | |
631 | probe_cache__delete(cache); | |
632 | return ret; | |
633 | } | |
634 | #else | |
635 | #define build_id_cache__add_sdt_cache(sbuild_id, realname) (0) | |
636 | #endif | |
637 | ||
e35f7362 MH |
638 | int build_id_cache__add_s(const char *sbuild_id, const char *name, |
639 | bool is_kallsyms, bool is_vdso) | |
e195fac8 NK |
640 | { |
641 | const size_t size = PATH_MAX; | |
8d8c8e4c | 642 | char *realname = NULL, *filename = NULL, *dir_name = NULL, |
01412261 | 643 | *linkname = zalloc(size), *tmp; |
8d8c8e4c | 644 | int err = -1; |
e195fac8 | 645 | |
8d8c8e4c | 646 | if (!is_kallsyms) { |
e195fac8 | 647 | realname = realpath(name, NULL); |
8d8c8e4c MH |
648 | if (!realname) |
649 | goto out_free; | |
650 | } | |
e195fac8 | 651 | |
4698b8b7 MH |
652 | dir_name = build_id_cache__cachedir(sbuild_id, name, |
653 | is_kallsyms, is_vdso); | |
8d8c8e4c | 654 | if (!dir_name) |
e195fac8 NK |
655 | goto out_free; |
656 | ||
01412261 MH |
657 | /* Remove old style build-id cache */ |
658 | if (is_regular_file(dir_name)) | |
659 | if (unlink(dir_name)) | |
660 | goto out_free; | |
661 | ||
8d8c8e4c | 662 | if (mkdir_p(dir_name, 0755)) |
e195fac8 NK |
663 | goto out_free; |
664 | ||
01412261 MH |
665 | /* Save the allocated buildid dirname */ |
666 | if (asprintf(&filename, "%s/%s", dir_name, | |
667 | build_id_cache__basename(is_kallsyms, is_vdso)) < 0) { | |
8d8c8e4c MH |
668 | filename = NULL; |
669 | goto out_free; | |
670 | } | |
e195fac8 NK |
671 | |
672 | if (access(filename, F_OK)) { | |
673 | if (is_kallsyms) { | |
674 | if (copyfile("/proc/kallsyms", filename)) | |
675 | goto out_free; | |
0635b0f7 MV |
676 | } else if (link(realname, filename) && errno != EEXIST && |
677 | copyfile(name, filename)) | |
e195fac8 NK |
678 | goto out_free; |
679 | } | |
680 | ||
01412261 | 681 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd MH |
682 | goto out_free; |
683 | tmp = strrchr(linkname, '/'); | |
684 | *tmp = '\0'; | |
e195fac8 NK |
685 | |
686 | if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) | |
687 | goto out_free; | |
688 | ||
5cb113fd | 689 | *tmp = '/'; |
01412261 MH |
690 | tmp = dir_name + strlen(buildid_dir) - 5; |
691 | memcpy(tmp, "../..", 5); | |
e195fac8 | 692 | |
01412261 | 693 | if (symlink(tmp, linkname) == 0) |
e195fac8 | 694 | err = 0; |
6430a94e MH |
695 | |
696 | /* Update SDT cache : error is just warned */ | |
2ccc2202 | 697 | if (realname && build_id_cache__add_sdt_cache(sbuild_id, realname) < 0) |
f9655200 | 698 | pr_debug4("Failed to update/scan SDT cache for %s\n", realname); |
6430a94e | 699 | |
e195fac8 NK |
700 | out_free: |
701 | if (!is_kallsyms) | |
702 | free(realname); | |
703 | free(filename); | |
8d8c8e4c | 704 | free(dir_name); |
e195fac8 NK |
705 | free(linkname); |
706 | return err; | |
707 | } | |
708 | ||
709 | static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size, | |
e35f7362 MH |
710 | const char *name, bool is_kallsyms, |
711 | bool is_vdso) | |
e195fac8 | 712 | { |
d77fac7f | 713 | char sbuild_id[SBUILD_ID_SIZE]; |
e195fac8 NK |
714 | |
715 | build_id__sprintf(build_id, build_id_size, sbuild_id); | |
716 | ||
e35f7362 | 717 | return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso); |
e195fac8 NK |
718 | } |
719 | ||
a50d11a1 MH |
720 | bool build_id_cache__cached(const char *sbuild_id) |
721 | { | |
722 | bool ret = false; | |
01412261 | 723 | char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); |
a50d11a1 MH |
724 | |
725 | if (filename && !access(filename, F_OK)) | |
726 | ret = true; | |
727 | free(filename); | |
728 | ||
729 | return ret; | |
730 | } | |
731 | ||
e35f7362 | 732 | int build_id_cache__remove_s(const char *sbuild_id) |
e195fac8 NK |
733 | { |
734 | const size_t size = PATH_MAX; | |
735 | char *filename = zalloc(size), | |
5cb113fd | 736 | *linkname = zalloc(size), *tmp; |
e195fac8 NK |
737 | int err = -1; |
738 | ||
739 | if (filename == NULL || linkname == NULL) | |
740 | goto out_free; | |
741 | ||
01412261 | 742 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd | 743 | goto out_free; |
e195fac8 NK |
744 | |
745 | if (access(linkname, F_OK)) | |
746 | goto out_free; | |
747 | ||
748 | if (readlink(linkname, filename, size - 1) < 0) | |
749 | goto out_free; | |
750 | ||
751 | if (unlink(linkname)) | |
752 | goto out_free; | |
753 | ||
754 | /* | |
755 | * Since the link is relative, we must make it absolute: | |
756 | */ | |
5cb113fd MH |
757 | tmp = strrchr(linkname, '/') + 1; |
758 | snprintf(tmp, size - (tmp - linkname), "%s", filename); | |
e195fac8 | 759 | |
01412261 | 760 | if (rm_rf(linkname)) |
e195fac8 NK |
761 | goto out_free; |
762 | ||
763 | err = 0; | |
764 | out_free: | |
765 | free(filename); | |
766 | free(linkname); | |
767 | return err; | |
768 | } | |
769 | ||
e35f7362 | 770 | static int dso__cache_build_id(struct dso *dso, struct machine *machine) |
e195fac8 | 771 | { |
01412261 | 772 | bool is_kallsyms = dso__is_kallsyms(dso); |
e195fac8 NK |
773 | bool is_vdso = dso__is_vdso(dso); |
774 | const char *name = dso->long_name; | |
775 | char nm[PATH_MAX]; | |
776 | ||
777 | if (dso__is_kcore(dso)) { | |
778 | is_kallsyms = true; | |
779 | machine__mmap_name(machine, nm, sizeof(nm)); | |
780 | name = nm; | |
781 | } | |
782 | return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name, | |
e35f7362 | 783 | is_kallsyms, is_vdso); |
e195fac8 NK |
784 | } |
785 | ||
786 | static int __dsos__cache_build_ids(struct list_head *head, | |
e35f7362 | 787 | struct machine *machine) |
e195fac8 NK |
788 | { |
789 | struct dso *pos; | |
790 | int err = 0; | |
791 | ||
792 | dsos__for_each_with_build_id(pos, head) | |
e35f7362 | 793 | if (dso__cache_build_id(pos, machine)) |
e195fac8 NK |
794 | err = -1; |
795 | ||
796 | return err; | |
797 | } | |
798 | ||
e35f7362 | 799 | static int machine__cache_build_ids(struct machine *machine) |
e195fac8 | 800 | { |
3d39ac53 | 801 | return __dsos__cache_build_ids(&machine->dsos.head, machine); |
e195fac8 NK |
802 | } |
803 | ||
804 | int perf_session__cache_build_ids(struct perf_session *session) | |
805 | { | |
806 | struct rb_node *nd; | |
807 | int ret; | |
e195fac8 | 808 | |
73c5d224 NK |
809 | if (no_buildid_cache) |
810 | return 0; | |
811 | ||
498922ad | 812 | if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) |
e195fac8 NK |
813 | return -1; |
814 | ||
e35f7362 | 815 | ret = machine__cache_build_ids(&session->machines.host); |
e195fac8 NK |
816 | |
817 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
818 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
e35f7362 | 819 | ret |= machine__cache_build_ids(pos); |
e195fac8 NK |
820 | } |
821 | return ret ? -1 : 0; | |
822 | } | |
823 | ||
824 | static bool machine__read_build_ids(struct machine *machine, bool with_hits) | |
825 | { | |
3d39ac53 | 826 | return __dsos__read_build_ids(&machine->dsos.head, with_hits); |
e195fac8 NK |
827 | } |
828 | ||
829 | bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) | |
830 | { | |
831 | struct rb_node *nd; | |
832 | bool ret = machine__read_build_ids(&session->machines.host, with_hits); | |
833 | ||
834 | for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) { | |
835 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
836 | ret |= machine__read_build_ids(pos, with_hits); | |
837 | } | |
838 | ||
839 | return ret; | |
840 | } |