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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 */
9#include "util.h"
10#include <stdio.h>
11#include "build-id.h"
12#include "event.h"
13#include "symbol.h"
14#include <linux/kernel.h>
15#include "debug.h"
16
17static int build_id__mark_dso_hit(union perf_event *event,
18 struct perf_sample *sample __used,
19 struct perf_evsel *evsel __used,
20 struct perf_session *session)
21{
22 struct addr_location al;
23 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
24 struct thread *thread = perf_session__findnew(session, event->ip.pid);
25
26 if (thread == NULL) {
27 pr_err("problem processing %d event, skipping it.\n",
28 event->header.type);
29 return -1;
30 }
31
32 thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
33 event->ip.pid, event->ip.ip, &al);
34
35 if (al.map != NULL)
36 al.map->dso->hit = 1;
37
38 return 0;
39}
40
41static int perf_event__exit_del_thread(union perf_event *event,
42 struct perf_sample *sample __used,
43 struct perf_session *session)
44{
45 struct thread *thread = perf_session__findnew(session, event->fork.tid);
46
47 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
48 event->fork.ppid, event->fork.ptid);
49
50 if (thread) {
51 rb_erase(&thread->rb_node, &session->threads);
52 session->last_match = NULL;
53 thread__delete(thread);
54 }
55
56 return 0;
57}
58
59struct perf_event_ops build_id__mark_dso_hit_ops = {
60 .sample = build_id__mark_dso_hit,
61 .mmap = perf_event__process_mmap,
62 .fork = perf_event__process_task,
63 .exit = perf_event__exit_del_thread,
64};
65
66char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
67{
68 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
69
70 if (!self->has_build_id)
71 return NULL;
72
73 build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
74 if (bf == NULL) {
75 if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
76 build_id_hex, build_id_hex + 2) < 0)
77 return NULL;
78 } else
79 snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
80 build_id_hex, build_id_hex + 2);
81 return bf;
82}
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 */
9#include "util.h"
10#include <stdio.h>
11#include "build-id.h"
12#include "event.h"
13#include "symbol.h"
14#include <linux/kernel.h>
15#include "debug.h"
16#include "session.h"
17#include "tool.h"
18#include "header.h"
19#include "vdso.h"
20#include "probe-file.h"
21
22
23static bool no_buildid_cache;
24
25int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
26 union perf_event *event,
27 struct perf_sample *sample,
28 struct perf_evsel *evsel __maybe_unused,
29 struct machine *machine)
30{
31 struct addr_location al;
32 struct thread *thread = machine__findnew_thread(machine, sample->pid,
33 sample->tid);
34
35 if (thread == NULL) {
36 pr_err("problem processing %d event, skipping it.\n",
37 event->header.type);
38 return -1;
39 }
40
41 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al);
42
43 if (al.map != NULL)
44 al.map->dso->hit = 1;
45
46 thread__put(thread);
47 return 0;
48}
49
50static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
51 union perf_event *event,
52 struct perf_sample *sample
53 __maybe_unused,
54 struct machine *machine)
55{
56 struct thread *thread = machine__findnew_thread(machine,
57 event->fork.pid,
58 event->fork.tid);
59
60 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
61 event->fork.ppid, event->fork.ptid);
62
63 if (thread) {
64 machine__remove_thread(machine, thread);
65 thread__put(thread);
66 }
67
68 return 0;
69}
70
71struct perf_tool build_id__mark_dso_hit_ops = {
72 .sample = build_id__mark_dso_hit,
73 .mmap = perf_event__process_mmap,
74 .mmap2 = perf_event__process_mmap2,
75 .fork = perf_event__process_fork,
76 .exit = perf_event__exit_del_thread,
77 .attr = perf_event__process_attr,
78 .build_id = perf_event__process_build_id,
79 .ordered_events = true,
80};
81
82int 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 (bid - bf) + 1;
95}
96
97int 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
115int 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
129/* asnprintf consolidates asprintf and snprintf */
130static 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
148char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
149 size_t size)
150{
151 bool retry_old = true;
152
153 snprintf(bf, size, "%s/%s/%s/kallsyms",
154 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
155retry:
156 if (!access(bf, F_OK))
157 return bf;
158 if (retry_old) {
159 /* Try old style kallsyms cache */
160 snprintf(bf, size, "%s/%s/%s",
161 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
162 retry_old = false;
163 goto retry;
164 }
165
166 return NULL;
167}
168
169char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
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
179char *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 }
204out:
205 free(linkname);
206 return ret;
207}
208
209/* Check if the given build_id cache is valid on current running system */
210static 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
234static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
235{
236 return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
237}
238
239char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
240{
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;
247
248 if (!dso->has_build_id)
249 return NULL;
250
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;
267}
268
269bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size)
270{
271 char *id_name = NULL, *ch;
272 struct stat sb;
273 char sbuild_id[SBUILD_ID_SIZE];
274
275 if (!dso->has_build_id)
276 goto err;
277
278 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
279 id_name = build_id_cache__linkname(sbuild_id, NULL, 0);
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
303 free(id_name);
304 return strncmp(".ko", ch - 3, 3) == 0;
305err:
306 pr_err("Invalid build id: %s\n", id_name ? :
307 dso->long_name ? :
308 dso->short_name ? :
309 "[unknown]");
310 free(id_name);
311 return false;
312}
313
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
320static 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
343static int machine__write_buildid_table(struct machine *machine, int fd)
344{
345 int err = 0;
346 char nm[PATH_MAX];
347 struct dso *pos;
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 }
355
356 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
357 const char *name;
358 size_t name_len;
359 bool in_kernel = false;
360
361 if (!pos->hit && !dso__is_vdso(pos))
362 continue;
363
364 if (dso__is_vdso(pos)) {
365 name = pos->short_name;
366 name_len = pos->short_name_len;
367 } else if (dso__is_kcore(pos)) {
368 machine__mmap_name(machine, nm, sizeof(nm));
369 name = nm;
370 name_len = strlen(nm);
371 } else {
372 name = pos->long_name;
373 name_len = pos->long_name_len;
374 }
375
376 in_kernel = pos->kernel ||
377 is_kernel_module(name,
378 PERF_RECORD_MISC_CPUMODE_UNKNOWN);
379 err = write_buildid(name, name_len, pos->build_id, machine->pid,
380 in_kernel ? kmisc : umisc, fd);
381 if (err)
382 break;
383 }
384
385 return err;
386}
387
388int 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
405static 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
415static int machine__hit_all_dsos(struct machine *machine)
416{
417 return __dsos__hit_all(&machine->dsos.head);
418}
419
420int 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
440void disable_buildid_cache(void)
441{
442 no_buildid_cache = true;
443}
444
445static 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
452static 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
461struct strlist *build_id_cache__list_all(bool validonly)
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
468 /* for filename__ functions */
469 if (validonly)
470 symbol__init(NULL);
471
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;
502 if (validonly && !build_id_cache__valid_id(sbuild_id))
503 continue;
504 if (strlist__add(bidlist, sbuild_id) < 0)
505 goto err_out;
506 }
507 strlist__delete(linklist);
508 zfree(&linkdir);
509 }
510
511out_free:
512 strlist__delete(toplist);
513out:
514 free(topdir);
515
516 return bidlist;
517
518err_out:
519 strlist__delete(linklist);
520 zfree(&linkdir);
521 strlist__delete(bidlist);
522 bidlist = NULL;
523 goto out_free;
524}
525
526static 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 */
538char *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
569char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
570 bool is_kallsyms, bool is_vdso)
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
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)
584 filename = NULL;
585
586 if (!slash)
587 free(realname);
588
589 return filename;
590}
591
592int build_id_cache__list_build_ids(const char *pathname,
593 struct strlist **result)
594{
595 char *dir_name;
596 int ret = 0;
597
598 dir_name = build_id_cache__cachedir(NULL, pathname, false, false);
599 if (!dir_name)
600 return -ENOMEM;
601
602 *result = lsdir(dir_name, lsdir_no_dot_filter);
603 if (!*result)
604 ret = -errno;
605 free(dir_name);
606
607 return ret;
608}
609
610#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
611static 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_debug4("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
634int build_id_cache__add_s(const char *sbuild_id, const char *name,
635 bool is_kallsyms, bool is_vdso)
636{
637 const size_t size = PATH_MAX;
638 char *realname = NULL, *filename = NULL, *dir_name = NULL,
639 *linkname = zalloc(size), *tmp;
640 int err = -1;
641
642 if (!is_kallsyms) {
643 realname = realpath(name, NULL);
644 if (!realname)
645 goto out_free;
646 }
647
648 dir_name = build_id_cache__cachedir(sbuild_id, name,
649 is_kallsyms, is_vdso);
650 if (!dir_name)
651 goto out_free;
652
653 /* Remove old style build-id cache */
654 if (is_regular_file(dir_name))
655 if (unlink(dir_name))
656 goto out_free;
657
658 if (mkdir_p(dir_name, 0755))
659 goto out_free;
660
661 /* Save the allocated buildid dirname */
662 if (asprintf(&filename, "%s/%s", dir_name,
663 build_id_cache__basename(is_kallsyms, is_vdso)) < 0) {
664 filename = NULL;
665 goto out_free;
666 }
667
668 if (access(filename, F_OK)) {
669 if (is_kallsyms) {
670 if (copyfile("/proc/kallsyms", filename))
671 goto out_free;
672 } else if (link(realname, filename) && errno != EEXIST &&
673 copyfile(name, filename))
674 goto out_free;
675 }
676
677 if (!build_id_cache__linkname(sbuild_id, linkname, size))
678 goto out_free;
679 tmp = strrchr(linkname, '/');
680 *tmp = '\0';
681
682 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
683 goto out_free;
684
685 *tmp = '/';
686 tmp = dir_name + strlen(buildid_dir) - 5;
687 memcpy(tmp, "../..", 5);
688
689 if (symlink(tmp, linkname) == 0)
690 err = 0;
691
692 /* Update SDT cache : error is just warned */
693 if (build_id_cache__add_sdt_cache(sbuild_id, realname) < 0)
694 pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
695
696out_free:
697 if (!is_kallsyms)
698 free(realname);
699 free(filename);
700 free(dir_name);
701 free(linkname);
702 return err;
703}
704
705static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
706 const char *name, bool is_kallsyms,
707 bool is_vdso)
708{
709 char sbuild_id[SBUILD_ID_SIZE];
710
711 build_id__sprintf(build_id, build_id_size, sbuild_id);
712
713 return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
714}
715
716bool build_id_cache__cached(const char *sbuild_id)
717{
718 bool ret = false;
719 char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
720
721 if (filename && !access(filename, F_OK))
722 ret = true;
723 free(filename);
724
725 return ret;
726}
727
728int build_id_cache__remove_s(const char *sbuild_id)
729{
730 const size_t size = PATH_MAX;
731 char *filename = zalloc(size),
732 *linkname = zalloc(size), *tmp;
733 int err = -1;
734
735 if (filename == NULL || linkname == NULL)
736 goto out_free;
737
738 if (!build_id_cache__linkname(sbuild_id, linkname, size))
739 goto out_free;
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 */
753 tmp = strrchr(linkname, '/') + 1;
754 snprintf(tmp, size - (tmp - linkname), "%s", filename);
755
756 if (rm_rf(linkname))
757 goto out_free;
758
759 err = 0;
760out_free:
761 free(filename);
762 free(linkname);
763 return err;
764}
765
766static int dso__cache_build_id(struct dso *dso, struct machine *machine)
767{
768 bool is_kallsyms = dso__is_kallsyms(dso);
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,
779 is_kallsyms, is_vdso);
780}
781
782static int __dsos__cache_build_ids(struct list_head *head,
783 struct machine *machine)
784{
785 struct dso *pos;
786 int err = 0;
787
788 dsos__for_each_with_build_id(pos, head)
789 if (dso__cache_build_id(pos, machine))
790 err = -1;
791
792 return err;
793}
794
795static int machine__cache_build_ids(struct machine *machine)
796{
797 return __dsos__cache_build_ids(&machine->dsos.head, machine);
798}
799
800int perf_session__cache_build_ids(struct perf_session *session)
801{
802 struct rb_node *nd;
803 int ret;
804
805 if (no_buildid_cache)
806 return 0;
807
808 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
809 return -1;
810
811 ret = machine__cache_build_ids(&session->machines.host);
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);
815 ret |= machine__cache_build_ids(pos);
816 }
817 return ret ? -1 : 0;
818}
819
820static bool machine__read_build_ids(struct machine *machine, bool with_hits)
821{
822 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
823}
824
825bool 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}