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