6 * Copyright (C) 2009, 2010 Red Hat Inc.
7 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
14 #include <sys/types.h>
19 #include <linux/kernel.h>
26 #include "probe-file.h"
29 #include "sane_ctype.h"
31 static bool no_buildid_cache;
33 int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
34 union perf_event *event,
35 struct perf_sample *sample,
36 struct perf_evsel *evsel __maybe_unused,
37 struct machine *machine)
39 struct addr_location al;
40 struct thread *thread = machine__findnew_thread(machine, sample->pid,
44 pr_err("problem processing %d event, skipping it.\n",
49 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al);
58 static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
59 union perf_event *event,
60 struct perf_sample *sample
62 struct machine *machine)
64 struct thread *thread = machine__findnew_thread(machine,
68 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
69 event->fork.ppid, event->fork.ptid);
72 machine__remove_thread(machine, thread);
79 struct perf_tool build_id__mark_dso_hit_ops = {
80 .sample = build_id__mark_dso_hit,
81 .mmap = perf_event__process_mmap,
82 .mmap2 = perf_event__process_mmap2,
83 .fork = perf_event__process_fork,
84 .exit = perf_event__exit_del_thread,
85 .attr = perf_event__process_attr,
86 .build_id = perf_event__process_build_id,
87 .ordered_events = true,
90 int build_id__sprintf(const u8 *build_id, int len, char *bf)
93 const u8 *raw = build_id;
96 for (i = 0; i < len; ++i) {
97 sprintf(bid, "%02x", *raw);
102 return (bid - bf) + 1;
105 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
107 char notes[PATH_MAX];
108 u8 build_id[BUILD_ID_SIZE];
114 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
116 ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
120 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
123 int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
125 u8 build_id[BUILD_ID_SIZE];
128 ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
131 else if (ret != sizeof(build_id))
134 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
137 /* asnprintf consolidates asprintf and snprintf */
138 static int asnprintf(char **strp, size_t size, const char *fmt, ...)
148 ret = vsnprintf(*strp, size, fmt, ap);
150 ret = vasprintf(strp, fmt, ap);
156 char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
159 bool retry_old = true;
161 snprintf(bf, size, "%s/%s/%s/kallsyms",
162 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
164 if (!access(bf, F_OK))
167 /* Try old style kallsyms cache */
168 snprintf(bf, size, "%s/%s/%s",
169 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
177 char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
180 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
181 sbuild_id, sbuild_id + 2);
182 if (ret < 0 || (tmp && size < (unsigned int)ret))
187 char *build_id_cache__origname(const char *sbuild_id)
191 char *ret = NULL, *p;
192 size_t offs = 5; /* == strlen("../..") */
195 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
199 len = readlink(linkname, buf, sizeof(buf) - 1);
204 /* The link should be "../..<origpath>/<sbuild_id>" */
205 p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
206 if (p && (p > buf + offs)) {
208 if (buf[offs + 1] == '[')
210 * This is a DSO name, like [kernel.kallsyms].
211 * Skip the first '/', since this is not the
212 * cache of a regular file.
214 ret = strdup(buf + offs); /* Skip "../..[/]" */
221 /* Check if the given build_id cache is valid on current running system */
222 static bool build_id_cache__valid_id(char *sbuild_id)
224 char real_sbuild_id[SBUILD_ID_SIZE] = "";
229 pathname = build_id_cache__origname(sbuild_id);
233 if (!strcmp(pathname, DSO__NAME_KALLSYMS))
234 ret = sysfs__sprintf_build_id("/", real_sbuild_id);
235 else if (pathname[0] == '/')
236 ret = filename__sprintf_build_id(pathname, real_sbuild_id);
238 ret = -EINVAL; /* Should we support other special DSO cache? */
240 result = (strcmp(sbuild_id, real_sbuild_id) == 0);
246 static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
248 return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
251 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
253 bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
254 bool is_vdso = dso__is_vdso((struct dso *)dso);
255 char sbuild_id[SBUILD_ID_SIZE];
257 bool alloc = (bf == NULL);
260 if (!dso->has_build_id)
263 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
264 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
268 /* Check if old style build_id cache */
269 if (is_regular_file(linkname))
270 ret = asnprintf(&bf, size, "%s", linkname);
272 ret = asnprintf(&bf, size, "%s/%s", linkname,
273 build_id_cache__basename(is_kallsyms, is_vdso));
274 if (ret < 0 || (!alloc && size < (unsigned int)ret))
281 #define dsos__for_each_with_build_id(pos, head) \
282 list_for_each_entry(pos, head, node) \
283 if (!pos->has_build_id) \
287 static int write_buildid(const char *name, size_t name_len, u8 *build_id,
288 pid_t pid, u16 misc, int fd)
291 struct build_id_event b;
295 len = PERF_ALIGN(len, NAME_ALIGN);
297 memset(&b, 0, sizeof(b));
298 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
300 b.header.misc = misc;
301 b.header.size = sizeof(b) + len;
303 err = writen(fd, &b, sizeof(b));
307 return write_padded(fd, name, name_len + 1, len);
310 static int machine__write_buildid_table(struct machine *machine, int fd)
315 u16 kmisc = PERF_RECORD_MISC_KERNEL,
316 umisc = PERF_RECORD_MISC_USER;
318 if (!machine__is_host(machine)) {
319 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
320 umisc = PERF_RECORD_MISC_GUEST_USER;
323 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
326 bool in_kernel = false;
328 if (!pos->hit && !dso__is_vdso(pos))
331 if (dso__is_vdso(pos)) {
332 name = pos->short_name;
333 name_len = pos->short_name_len;
334 } else if (dso__is_kcore(pos)) {
335 machine__mmap_name(machine, nm, sizeof(nm));
337 name_len = strlen(nm);
339 name = pos->long_name;
340 name_len = pos->long_name_len;
343 in_kernel = pos->kernel ||
344 is_kernel_module(name,
345 PERF_RECORD_MISC_CPUMODE_UNKNOWN);
346 err = write_buildid(name, name_len, pos->build_id, machine->pid,
347 in_kernel ? kmisc : umisc, fd);
355 int perf_session__write_buildid_table(struct perf_session *session, int fd)
358 int err = machine__write_buildid_table(&session->machines.host, fd);
363 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
364 struct machine *pos = rb_entry(nd, struct machine, rb_node);
365 err = machine__write_buildid_table(pos, fd);
372 static int __dsos__hit_all(struct list_head *head)
376 list_for_each_entry(pos, head, node)
382 static int machine__hit_all_dsos(struct machine *machine)
384 return __dsos__hit_all(&machine->dsos.head);
387 int dsos__hit_all(struct perf_session *session)
392 err = machine__hit_all_dsos(&session->machines.host);
396 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
397 struct machine *pos = rb_entry(nd, struct machine, rb_node);
399 err = machine__hit_all_dsos(pos);
407 void disable_buildid_cache(void)
409 no_buildid_cache = true;
412 static bool lsdir_bid_head_filter(const char *name __maybe_unused,
415 return (strlen(d->d_name) == 2) &&
416 isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
419 static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
423 while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
425 return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0');
428 struct strlist *build_id_cache__list_all(bool validonly)
430 struct strlist *toplist, *linklist = NULL, *bidlist;
431 struct str_node *nd, *nd2;
432 char *topdir, *linkdir = NULL;
433 char sbuild_id[SBUILD_ID_SIZE];
435 /* for filename__ functions */
439 /* Open the top-level directory */
440 if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
443 bidlist = strlist__new(NULL, NULL);
447 toplist = lsdir(topdir, lsdir_bid_head_filter);
449 pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
450 /* If there is no buildid cache, return an empty list */
456 strlist__for_each_entry(nd, toplist) {
457 if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
459 /* Open the lower-level directory */
460 linklist = lsdir(linkdir, lsdir_bid_tail_filter);
462 pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
465 strlist__for_each_entry(nd2, linklist) {
466 if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
467 nd->s, nd2->s) != SBUILD_ID_SIZE - 1)
469 if (validonly && !build_id_cache__valid_id(sbuild_id))
471 if (strlist__add(bidlist, sbuild_id) < 0)
474 strlist__delete(linklist);
479 strlist__delete(toplist);
486 strlist__delete(linklist);
488 strlist__delete(bidlist);
493 static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
497 for (i = 0; i < len; i++) {
498 if (!isxdigit(maybe_sbuild_id[i]))
504 /* Return the valid complete build-id */
505 char *build_id_cache__complement(const char *incomplete_sbuild_id)
507 struct strlist *bidlist;
508 struct str_node *nd, *cand = NULL;
509 char *sbuild_id = NULL;
510 size_t len = strlen(incomplete_sbuild_id);
512 if (len >= SBUILD_ID_SIZE ||
513 !str_is_build_id(incomplete_sbuild_id, len))
516 bidlist = build_id_cache__list_all(true);
520 strlist__for_each_entry(nd, bidlist) {
521 if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
523 if (cand) { /* Error: There are more than 2 candidates. */
530 sbuild_id = strdup(cand->s);
531 strlist__delete(bidlist);
536 char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
537 bool is_kallsyms, bool is_vdso)
539 char *realname = (char *)name, *filename;
540 bool slash = is_kallsyms || is_vdso;
543 realname = realpath(name, NULL);
548 if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
549 is_vdso ? DSO__NAME_VDSO : realname,
550 sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
559 int build_id_cache__list_build_ids(const char *pathname,
560 struct strlist **result)
565 dir_name = build_id_cache__cachedir(NULL, pathname, false, false);
569 *result = lsdir(dir_name, lsdir_no_dot_filter);
577 #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
578 static int build_id_cache__add_sdt_cache(const char *sbuild_id,
579 const char *realname)
581 struct probe_cache *cache;
584 cache = probe_cache__new(sbuild_id);
588 ret = probe_cache__scan_sdt(cache, realname);
590 pr_debug4("Found %d SDTs in %s\n", ret, realname);
591 if (probe_cache__commit(cache) < 0)
594 probe_cache__delete(cache);
598 #define build_id_cache__add_sdt_cache(sbuild_id, realname) (0)
601 int build_id_cache__add_s(const char *sbuild_id, const char *name,
602 bool is_kallsyms, bool is_vdso)
604 const size_t size = PATH_MAX;
605 char *realname = NULL, *filename = NULL, *dir_name = NULL,
606 *linkname = zalloc(size), *tmp;
610 realname = realpath(name, NULL);
615 dir_name = build_id_cache__cachedir(sbuild_id, name,
616 is_kallsyms, is_vdso);
620 /* Remove old style build-id cache */
621 if (is_regular_file(dir_name))
622 if (unlink(dir_name))
625 if (mkdir_p(dir_name, 0755))
628 /* Save the allocated buildid dirname */
629 if (asprintf(&filename, "%s/%s", dir_name,
630 build_id_cache__basename(is_kallsyms, is_vdso)) < 0) {
635 if (access(filename, F_OK)) {
637 if (copyfile("/proc/kallsyms", filename))
639 } else if (link(realname, filename) && errno != EEXIST &&
640 copyfile(name, filename))
644 if (!build_id_cache__linkname(sbuild_id, linkname, size))
646 tmp = strrchr(linkname, '/');
649 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
653 tmp = dir_name + strlen(buildid_dir) - 5;
654 memcpy(tmp, "../..", 5);
656 if (symlink(tmp, linkname) == 0)
659 /* Update SDT cache : error is just warned */
660 if (realname && build_id_cache__add_sdt_cache(sbuild_id, realname) < 0)
661 pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
672 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
673 const char *name, bool is_kallsyms,
676 char sbuild_id[SBUILD_ID_SIZE];
678 build_id__sprintf(build_id, build_id_size, sbuild_id);
680 return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
683 bool build_id_cache__cached(const char *sbuild_id)
686 char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
688 if (filename && !access(filename, F_OK))
695 int build_id_cache__remove_s(const char *sbuild_id)
697 const size_t size = PATH_MAX;
698 char *filename = zalloc(size),
699 *linkname = zalloc(size), *tmp;
702 if (filename == NULL || linkname == NULL)
705 if (!build_id_cache__linkname(sbuild_id, linkname, size))
708 if (access(linkname, F_OK))
711 if (readlink(linkname, filename, size - 1) < 0)
714 if (unlink(linkname))
718 * Since the link is relative, we must make it absolute:
720 tmp = strrchr(linkname, '/') + 1;
721 snprintf(tmp, size - (tmp - linkname), "%s", filename);
733 static int dso__cache_build_id(struct dso *dso, struct machine *machine)
735 bool is_kallsyms = dso__is_kallsyms(dso);
736 bool is_vdso = dso__is_vdso(dso);
737 const char *name = dso->long_name;
740 if (dso__is_kcore(dso)) {
742 machine__mmap_name(machine, nm, sizeof(nm));
745 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
746 is_kallsyms, is_vdso);
749 static int __dsos__cache_build_ids(struct list_head *head,
750 struct machine *machine)
755 dsos__for_each_with_build_id(pos, head)
756 if (dso__cache_build_id(pos, machine))
762 static int machine__cache_build_ids(struct machine *machine)
764 return __dsos__cache_build_ids(&machine->dsos.head, machine);
767 int perf_session__cache_build_ids(struct perf_session *session)
772 if (no_buildid_cache)
775 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
778 ret = machine__cache_build_ids(&session->machines.host);
780 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
781 struct machine *pos = rb_entry(nd, struct machine, rb_node);
782 ret |= machine__cache_build_ids(pos);
787 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
789 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
792 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
795 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
797 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
798 struct machine *pos = rb_entry(nd, struct machine, rb_node);
799 ret |= machine__read_build_ids(pos, with_hits);