963 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * build-id.c4 *5 * build-id support6 *7 * Copyright (C) 2009, 2010 Red Hat Inc.8 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>9 */10#include "util.h" // lsdir(), mkdir_p(), rm_rf()11#include <dirent.h>12#include <errno.h>13#include <stdio.h>14#include <sys/stat.h>15#include <sys/types.h>16#include "util/copyfile.h"17#include "dso.h"18#include "build-id.h"19#include "event.h"20#include "namespaces.h"21#include "map.h"22#include "symbol.h"23#include "thread.h"24#include <linux/kernel.h>25#include "debug.h"26#include "session.h"27#include "tool.h"28#include "header.h"29#include "vdso.h"30#include "path.h"31#include "probe-file.h"32#include "strlist.h"33 34#ifdef HAVE_DEBUGINFOD_SUPPORT35#include <elfutils/debuginfod.h>36#endif37 38#include <linux/ctype.h>39#include <linux/zalloc.h>40#include <linux/string.h>41#include <asm/bug.h>42 43static bool no_buildid_cache;44 45int build_id__mark_dso_hit(const struct perf_tool *tool __maybe_unused,46 union perf_event *event,47 struct perf_sample *sample,48 struct evsel *evsel __maybe_unused,49 struct machine *machine)50{51 struct addr_location al;52 struct thread *thread = machine__findnew_thread(machine, sample->pid,53 sample->tid);54 55 if (thread == NULL) {56 pr_err("problem processing %d event, skipping it.\n",57 event->header.type);58 return -1;59 }60 61 addr_location__init(&al);62 if (thread__find_map(thread, sample->cpumode, sample->ip, &al))63 dso__set_hit(map__dso(al.map));64 65 addr_location__exit(&al);66 thread__put(thread);67 return 0;68}69 70int build_id__sprintf(const struct build_id *build_id, char *bf)71{72 char *bid = bf;73 const u8 *raw = build_id->data;74 size_t i;75 76 bf[0] = 0x0;77 78 for (i = 0; i < build_id->size; ++i) {79 sprintf(bid, "%02x", *raw);80 ++raw;81 bid += 2;82 }83 84 return (bid - bf) + 1;85}86 87int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)88{89 char notes[PATH_MAX];90 struct build_id bid;91 int ret;92 93 if (!root_dir)94 root_dir = "";95 96 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);97 98 ret = sysfs__read_build_id(notes, &bid);99 if (ret < 0)100 return ret;101 102 return build_id__sprintf(&bid, sbuild_id);103}104 105int filename__sprintf_build_id(const char *pathname, char *sbuild_id)106{107 struct build_id bid;108 int ret;109 110 ret = filename__read_build_id(pathname, &bid);111 if (ret < 0)112 return ret;113 114 return build_id__sprintf(&bid, sbuild_id);115}116 117/* asnprintf consolidates asprintf and snprintf */118static int asnprintf(char **strp, size_t size, const char *fmt, ...)119{120 va_list ap;121 int ret;122 123 if (!strp)124 return -EINVAL;125 126 va_start(ap, fmt);127 if (*strp)128 ret = vsnprintf(*strp, size, fmt, ap);129 else130 ret = vasprintf(strp, fmt, ap);131 va_end(ap);132 133 return ret;134}135 136char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,137 size_t size)138{139 bool retry_old = true;140 141 snprintf(bf, size, "%s/%s/%s/kallsyms",142 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);143retry:144 if (!access(bf, F_OK))145 return bf;146 if (retry_old) {147 /* Try old style kallsyms cache */148 snprintf(bf, size, "%s/%s/%s",149 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);150 retry_old = false;151 goto retry;152 }153 154 return NULL;155}156 157char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)158{159 char *tmp = bf;160 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,161 sbuild_id, sbuild_id + 2);162 if (ret < 0 || (tmp && size < (unsigned int)ret))163 return NULL;164 return bf;165}166 167/* The caller is responsible to free the returned buffer. */168char *build_id_cache__origname(const char *sbuild_id)169{170 char *linkname;171 char buf[PATH_MAX];172 char *ret = NULL, *p;173 size_t offs = 5; /* == strlen("../..") */174 ssize_t len;175 176 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);177 if (!linkname)178 return NULL;179 180 len = readlink(linkname, buf, sizeof(buf) - 1);181 if (len <= 0)182 goto out;183 buf[len] = '\0';184 185 /* The link should be "../..<origpath>/<sbuild_id>" */186 p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */187 if (p && (p > buf + offs)) {188 *p = '\0';189 if (buf[offs + 1] == '[')190 offs++; /*191 * This is a DSO name, like [kernel.kallsyms].192 * Skip the first '/', since this is not the193 * cache of a regular file.194 */195 ret = strdup(buf + offs); /* Skip "../..[/]" */196 }197out:198 free(linkname);199 return ret;200}201 202/* Check if the given build_id cache is valid on current running system */203static bool build_id_cache__valid_id(char *sbuild_id)204{205 char real_sbuild_id[SBUILD_ID_SIZE] = "";206 char *pathname;207 int ret = 0;208 bool result = false;209 210 pathname = build_id_cache__origname(sbuild_id);211 if (!pathname)212 return false;213 214 if (!strcmp(pathname, DSO__NAME_KALLSYMS))215 ret = sysfs__sprintf_build_id("/", real_sbuild_id);216 else if (pathname[0] == '/')217 ret = filename__sprintf_build_id(pathname, real_sbuild_id);218 else219 ret = -EINVAL; /* Should we support other special DSO cache? */220 if (ret >= 0)221 result = (strcmp(sbuild_id, real_sbuild_id) == 0);222 free(pathname);223 224 return result;225}226 227static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,228 bool is_debug)229{230 return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?231 "debug" : "elf"));232}233 234char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size,235 bool is_debug, bool is_kallsyms)236{237 bool is_vdso = dso__is_vdso((struct dso *)dso);238 char sbuild_id[SBUILD_ID_SIZE];239 char *linkname;240 bool alloc = (bf == NULL);241 int ret;242 243 if (!dso__has_build_id(dso))244 return NULL;245 246 build_id__sprintf(dso__bid_const(dso), sbuild_id);247 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);248 if (!linkname)249 return NULL;250 251 /* Check if old style build_id cache */252 if (is_regular_file(linkname))253 ret = asnprintf(&bf, size, "%s", linkname);254 else255 ret = asnprintf(&bf, size, "%s/%s", linkname,256 build_id_cache__basename(is_kallsyms, is_vdso,257 is_debug));258 if (ret < 0 || (!alloc && size < (unsigned int)ret))259 bf = NULL;260 free(linkname);261 262 return bf;263}264 265char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,266 bool is_debug)267{268 bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);269 270 return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms);271}272 273static int write_buildid(const char *name, size_t name_len, struct build_id *bid,274 pid_t pid, u16 misc, struct feat_fd *fd)275{276 int err;277 struct perf_record_header_build_id b;278 size_t len;279 280 len = sizeof(b) + name_len + 1;281 len = PERF_ALIGN(len, sizeof(u64));282 283 memset(&b, 0, sizeof(b));284 memcpy(&b.data, bid->data, bid->size);285 b.size = (u8) bid->size;286 misc |= PERF_RECORD_MISC_BUILD_ID_SIZE;287 b.pid = pid;288 b.header.misc = misc;289 b.header.size = len;290 291 err = do_write(fd, &b, sizeof(b));292 if (err < 0)293 return err;294 295 return write_padded(fd, name, name_len + 1, len);296}297 298struct machine__write_buildid_table_cb_args {299 struct machine *machine;300 struct feat_fd *fd;301 u16 kmisc, umisc;302};303 304static int machine__write_buildid_table_cb(struct dso *dso, void *data)305{306 struct machine__write_buildid_table_cb_args *args = data;307 const char *name;308 size_t name_len;309 bool in_kernel = false;310 311 if (!dso__has_build_id(dso))312 return 0;313 314 if (!dso__hit(dso) && !dso__is_vdso(dso))315 return 0;316 317 if (dso__is_vdso(dso)) {318 name = dso__short_name(dso);319 name_len = dso__short_name_len(dso);320 } else if (dso__is_kcore(dso)) {321 name = args->machine->mmap_name;322 name_len = strlen(name);323 } else {324 name = dso__long_name(dso);325 name_len = dso__long_name_len(dso);326 }327 328 in_kernel = dso__kernel(dso) || is_kernel_module(name, PERF_RECORD_MISC_CPUMODE_UNKNOWN);329 return write_buildid(name, name_len, dso__bid(dso), args->machine->pid,330 in_kernel ? args->kmisc : args->umisc, args->fd);331}332 333static int machine__write_buildid_table(struct machine *machine, struct feat_fd *fd)334{335 struct machine__write_buildid_table_cb_args args = {336 .machine = machine,337 .fd = fd,338 .kmisc = PERF_RECORD_MISC_KERNEL,339 .umisc = PERF_RECORD_MISC_USER,340 };341 342 if (!machine__is_host(machine)) {343 args.kmisc = PERF_RECORD_MISC_GUEST_KERNEL;344 args.umisc = PERF_RECORD_MISC_GUEST_USER;345 }346 347 return dsos__for_each_dso(&machine->dsos, machine__write_buildid_table_cb, &args);348}349 350int perf_session__write_buildid_table(struct perf_session *session,351 struct feat_fd *fd)352{353 struct rb_node *nd;354 int err = machine__write_buildid_table(&session->machines.host, fd);355 356 if (err)357 return err;358 359 for (nd = rb_first_cached(&session->machines.guests); nd;360 nd = rb_next(nd)) {361 struct machine *pos = rb_entry(nd, struct machine, rb_node);362 err = machine__write_buildid_table(pos, fd);363 if (err)364 break;365 }366 return err;367}368 369void disable_buildid_cache(void)370{371 no_buildid_cache = true;372}373 374static bool lsdir_bid_head_filter(const char *name __maybe_unused,375 struct dirent *d)376{377 return (strlen(d->d_name) == 2) &&378 isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);379}380 381static bool lsdir_bid_tail_filter(const char *name __maybe_unused,382 struct dirent *d)383{384 int i = 0;385 while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)386 i++;387 return (i >= SBUILD_ID_MIN_SIZE - 3) && (i <= SBUILD_ID_SIZE - 3) &&388 (d->d_name[i] == '\0');389}390 391struct strlist *build_id_cache__list_all(bool validonly)392{393 struct strlist *toplist, *linklist = NULL, *bidlist;394 struct str_node *nd, *nd2;395 char *topdir, *linkdir = NULL;396 char sbuild_id[SBUILD_ID_SIZE];397 398 /* for filename__ functions */399 if (validonly)400 symbol__init(NULL);401 402 /* Open the top-level directory */403 if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)404 return NULL;405 406 bidlist = strlist__new(NULL, NULL);407 if (!bidlist)408 goto out;409 410 toplist = lsdir(topdir, lsdir_bid_head_filter);411 if (!toplist) {412 pr_debug("Error in lsdir(%s): %d\n", topdir, errno);413 /* If there is no buildid cache, return an empty list */414 if (errno == ENOENT)415 goto out;416 goto err_out;417 }418 419 strlist__for_each_entry(nd, toplist) {420 if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)421 goto err_out;422 /* Open the lower-level directory */423 linklist = lsdir(linkdir, lsdir_bid_tail_filter);424 if (!linklist) {425 pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);426 goto err_out;427 }428 strlist__for_each_entry(nd2, linklist) {429 if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",430 nd->s, nd2->s) > SBUILD_ID_SIZE - 1)431 goto err_out;432 if (validonly && !build_id_cache__valid_id(sbuild_id))433 continue;434 if (strlist__add(bidlist, sbuild_id) < 0)435 goto err_out;436 }437 strlist__delete(linklist);438 zfree(&linkdir);439 }440 441out_free:442 strlist__delete(toplist);443out:444 free(topdir);445 446 return bidlist;447 448err_out:449 strlist__delete(linklist);450 zfree(&linkdir);451 strlist__delete(bidlist);452 bidlist = NULL;453 goto out_free;454}455 456static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)457{458 size_t i;459 460 for (i = 0; i < len; i++) {461 if (!isxdigit(maybe_sbuild_id[i]))462 return false;463 }464 return true;465}466 467/* Return the valid complete build-id */468char *build_id_cache__complement(const char *incomplete_sbuild_id)469{470 struct strlist *bidlist;471 struct str_node *nd, *cand = NULL;472 char *sbuild_id = NULL;473 size_t len = strlen(incomplete_sbuild_id);474 475 if (len >= SBUILD_ID_SIZE ||476 !str_is_build_id(incomplete_sbuild_id, len))477 return NULL;478 479 bidlist = build_id_cache__list_all(true);480 if (!bidlist)481 return NULL;482 483 strlist__for_each_entry(nd, bidlist) {484 if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)485 continue;486 if (cand) { /* Error: There are more than 2 candidates. */487 cand = NULL;488 break;489 }490 cand = nd;491 }492 if (cand)493 sbuild_id = strdup(cand->s);494 strlist__delete(bidlist);495 496 return sbuild_id;497}498 499char *build_id_cache__cachedir(const char *sbuild_id, const char *name,500 struct nsinfo *nsi, bool is_kallsyms,501 bool is_vdso)502{503 char *realname = NULL, *filename;504 bool slash = is_kallsyms || is_vdso;505 506 if (!slash)507 realname = nsinfo__realpath(name, nsi);508 509 if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",510 is_vdso ? DSO__NAME_VDSO : (realname ? realname : name),511 sbuild_id ? "/" : "", sbuild_id ?: "") < 0)512 filename = NULL;513 514 free(realname);515 return filename;516}517 518int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,519 struct strlist **result)520{521 char *dir_name;522 int ret = 0;523 524 dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);525 if (!dir_name)526 return -ENOMEM;527 528 *result = lsdir(dir_name, lsdir_no_dot_filter);529 if (!*result)530 ret = -errno;531 free(dir_name);532 533 return ret;534}535 536#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)537static int build_id_cache__add_sdt_cache(const char *sbuild_id,538 const char *realname,539 struct nsinfo *nsi)540{541 struct probe_cache *cache;542 int ret;543 struct nscookie nsc;544 545 cache = probe_cache__new(sbuild_id, nsi);546 if (!cache)547 return -1;548 549 nsinfo__mountns_enter(nsi, &nsc);550 ret = probe_cache__scan_sdt(cache, realname);551 nsinfo__mountns_exit(&nsc);552 if (ret >= 0) {553 pr_debug4("Found %d SDTs in %s\n", ret, realname);554 if (probe_cache__commit(cache) < 0)555 ret = -1;556 }557 probe_cache__delete(cache);558 return ret;559}560#else561#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)562#endif563 564static char *build_id_cache__find_debug(const char *sbuild_id,565 struct nsinfo *nsi,566 const char *root_dir)567{568 const char *dirname = "/usr/lib/debug/.build-id/";569 char *realname = NULL;570 char dirbuf[PATH_MAX];571 char *debugfile;572 struct nscookie nsc;573 size_t len = 0;574 575 debugfile = calloc(1, PATH_MAX);576 if (!debugfile)577 goto out;578 579 if (root_dir) {580 path__join(dirbuf, PATH_MAX, root_dir, dirname);581 dirname = dirbuf;582 }583 584 len = __symbol__join_symfs(debugfile, PATH_MAX, dirname);585 snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,586 sbuild_id + 2);587 588 nsinfo__mountns_enter(nsi, &nsc);589 realname = realpath(debugfile, NULL);590 if (realname && access(realname, R_OK))591 zfree(&realname);592 nsinfo__mountns_exit(&nsc);593 594#ifdef HAVE_DEBUGINFOD_SUPPORT595 if (realname == NULL) {596 debuginfod_client* c;597 598 pr_debug("Downloading debug info with build id %s\n", sbuild_id);599 600 c = debuginfod_begin();601 if (c != NULL) {602 int fd = debuginfod_find_debuginfo(c,603 (const unsigned char*)sbuild_id, 0,604 &realname);605 if (fd >= 0)606 close(fd); /* retaining reference by realname */607 debuginfod_end(c);608 }609 }610#endif611 612out:613 free(debugfile);614 return realname;615}616 617int618build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,619 struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,620 const char *proper_name, const char *root_dir)621{622 const size_t size = PATH_MAX;623 char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp;624 char *debugfile = NULL;625 int err = -1;626 627 if (!proper_name)628 proper_name = name;629 630 dir_name = build_id_cache__cachedir(sbuild_id, proper_name, nsi, is_kallsyms,631 is_vdso);632 if (!dir_name)633 goto out_free;634 635 /* Remove old style build-id cache */636 if (is_regular_file(dir_name))637 if (unlink(dir_name))638 goto out_free;639 640 if (mkdir_p(dir_name, 0755))641 goto out_free;642 643 /* Save the allocated buildid dirname */644 if (asprintf(&filename, "%s/%s", dir_name,645 build_id_cache__basename(is_kallsyms, is_vdso,646 false)) < 0) {647 filename = NULL;648 goto out_free;649 }650 651 if (access(filename, F_OK)) {652 if (is_kallsyms) {653 if (copyfile("/proc/kallsyms", filename))654 goto out_free;655 } else if (nsi && nsinfo__need_setns(nsi)) {656 if (copyfile_ns(name, filename, nsi))657 goto out_free;658 } else if (link(realname, filename) && errno != EEXIST) {659 struct stat f_stat;660 661 if (!(stat(name, &f_stat) < 0) &&662 copyfile_mode(name, filename, f_stat.st_mode))663 goto out_free;664 }665 }666 667 /* Some binaries are stripped, but have .debug files with their symbol668 * table. Check to see if we can locate one of those, since the elf669 * file itself may not be very useful to users of our tools without a670 * symtab.671 */672 if (!is_kallsyms && !is_vdso &&673 strncmp(".ko", name + strlen(name) - 3, 3)) {674 debugfile = build_id_cache__find_debug(sbuild_id, nsi, root_dir);675 if (debugfile) {676 zfree(&filename);677 if (asprintf(&filename, "%s/%s", dir_name,678 build_id_cache__basename(false, false, true)) < 0) {679 filename = NULL;680 goto out_free;681 }682 if (access(filename, F_OK)) {683 if (nsi && nsinfo__need_setns(nsi)) {684 if (copyfile_ns(debugfile, filename,685 nsi))686 goto out_free;687 } else if (link(debugfile, filename) &&688 errno != EEXIST &&689 copyfile(debugfile, filename))690 goto out_free;691 }692 }693 }694 695 if (!build_id_cache__linkname(sbuild_id, linkname, size))696 goto out_free;697 tmp = strrchr(linkname, '/');698 *tmp = '\0';699 700 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))701 goto out_free;702 703 *tmp = '/';704 tmp = dir_name + strlen(buildid_dir) - 5;705 memcpy(tmp, "../..", 5);706 707 if (symlink(tmp, linkname) == 0) {708 err = 0;709 } else if (errno == EEXIST) {710 char path[PATH_MAX];711 ssize_t len;712 713 len = readlink(linkname, path, sizeof(path) - 1);714 if (len <= 0) {715 pr_err("Can't read link: %s\n", linkname);716 goto out_free;717 }718 path[len] = '\0';719 720 if (strcmp(tmp, path)) {721 pr_debug("build <%s> already linked to %s\n",722 sbuild_id, linkname);723 }724 err = 0;725 }726 727 /* Update SDT cache : error is just warned */728 if (realname &&729 build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)730 pr_debug4("Failed to update/scan SDT cache for %s\n", realname);731 732out_free:733 free(filename);734 free(debugfile);735 free(dir_name);736 free(linkname);737 return err;738}739 740int __build_id_cache__add_s(const char *sbuild_id, const char *name,741 struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,742 const char *proper_name, const char *root_dir)743{744 char *realname = NULL;745 int err = -1;746 747 if (!is_kallsyms) {748 if (!is_vdso)749 realname = nsinfo__realpath(name, nsi);750 else751 realname = realpath(name, NULL);752 if (!realname)753 goto out_free;754 }755 756 err = build_id_cache__add(sbuild_id, name, realname, nsi,757 is_kallsyms, is_vdso, proper_name, root_dir);758out_free:759 if (!is_kallsyms)760 free(realname);761 return err;762}763 764static int build_id_cache__add_b(const struct build_id *bid,765 const char *name, struct nsinfo *nsi,766 bool is_kallsyms, bool is_vdso,767 const char *proper_name,768 const char *root_dir)769{770 char sbuild_id[SBUILD_ID_SIZE];771 772 build_id__sprintf(bid, sbuild_id);773 774 return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,775 is_vdso, proper_name, root_dir);776}777 778bool build_id_cache__cached(const char *sbuild_id)779{780 bool ret = false;781 char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);782 783 if (filename && !access(filename, F_OK))784 ret = true;785 free(filename);786 787 return ret;788}789 790int build_id_cache__remove_s(const char *sbuild_id)791{792 const size_t size = PATH_MAX;793 char *filename = zalloc(size),794 *linkname = zalloc(size), *tmp;795 int err = -1;796 797 if (filename == NULL || linkname == NULL)798 goto out_free;799 800 if (!build_id_cache__linkname(sbuild_id, linkname, size))801 goto out_free;802 803 if (access(linkname, F_OK))804 goto out_free;805 806 if (readlink(linkname, filename, size - 1) < 0)807 goto out_free;808 809 if (unlink(linkname))810 goto out_free;811 812 /*813 * Since the link is relative, we must make it absolute:814 */815 tmp = strrchr(linkname, '/') + 1;816 snprintf(tmp, size - (tmp - linkname), "%s", filename);817 818 if (rm_rf(linkname))819 goto out_free;820 821 err = 0;822out_free:823 free(filename);824 free(linkname);825 return err;826}827 828static int filename__read_build_id_ns(const char *filename,829 struct build_id *bid,830 struct nsinfo *nsi)831{832 struct nscookie nsc;833 int ret;834 835 nsinfo__mountns_enter(nsi, &nsc);836 ret = filename__read_build_id(filename, bid);837 nsinfo__mountns_exit(&nsc);838 839 return ret;840}841 842static bool dso__build_id_mismatch(struct dso *dso, const char *name)843{844 struct build_id bid;845 bool ret = false;846 847 mutex_lock(dso__lock(dso));848 if (filename__read_build_id_ns(name, &bid, dso__nsinfo(dso)) >= 0)849 ret = !dso__build_id_equal(dso, &bid);850 851 mutex_unlock(dso__lock(dso));852 853 return ret;854}855 856static int dso__cache_build_id(struct dso *dso, struct machine *machine,857 void *priv __maybe_unused)858{859 bool is_kallsyms = dso__is_kallsyms(dso);860 bool is_vdso = dso__is_vdso(dso);861 const char *name = dso__long_name(dso);862 const char *proper_name = NULL;863 const char *root_dir = NULL;864 char *allocated_name = NULL;865 int ret = 0;866 867 if (!dso__has_build_id(dso))868 return 0;869 870 if (dso__is_kcore(dso)) {871 is_kallsyms = true;872 name = machine->mmap_name;873 }874 875 if (!machine__is_host(machine)) {876 if (*machine->root_dir) {877 root_dir = machine->root_dir;878 ret = asprintf(&allocated_name, "%s/%s", root_dir, name);879 if (ret < 0)880 return ret;881 proper_name = name;882 name = allocated_name;883 } else if (is_kallsyms) {884 /* Cannot get guest kallsyms */885 return 0;886 }887 }888 889 if (!is_kallsyms && dso__build_id_mismatch(dso, name))890 goto out_free;891 892 mutex_lock(dso__lock(dso));893 ret = build_id_cache__add_b(dso__bid(dso), name, dso__nsinfo(dso),894 is_kallsyms, is_vdso, proper_name, root_dir);895 mutex_unlock(dso__lock(dso));896out_free:897 free(allocated_name);898 return ret;899}900 901static int902machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv)903{904 int ret = machine__for_each_dso(&machines->host, fn, priv);905 struct rb_node *nd;906 907 for (nd = rb_first_cached(&machines->guests); nd;908 nd = rb_next(nd)) {909 struct machine *pos = rb_entry(nd, struct machine, rb_node);910 911 ret |= machine__for_each_dso(pos, fn, priv);912 }913 return ret ? -1 : 0;914}915 916int __perf_session__cache_build_ids(struct perf_session *session,917 machine__dso_t fn, void *priv)918{919 if (no_buildid_cache)920 return 0;921 922 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)923 return -1;924 925 return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0;926}927 928int perf_session__cache_build_ids(struct perf_session *session)929{930 return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL);931}932 933static bool machine__read_build_ids(struct machine *machine, bool with_hits)934{935 return dsos__read_build_ids(&machine->dsos, with_hits);936}937 938bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)939{940 struct rb_node *nd;941 bool ret = machine__read_build_ids(&session->machines.host, with_hits);942 943 for (nd = rb_first_cached(&session->machines.guests); nd;944 nd = rb_next(nd)) {945 struct machine *pos = rb_entry(nd, struct machine, rb_node);946 ret |= machine__read_build_ids(pos, with_hits);947 }948 949 return ret;950}951 952void build_id__init(struct build_id *bid, const u8 *data, size_t size)953{954 WARN_ON(size > BUILD_ID_SIZE);955 memcpy(bid->data, data, size);956 bid->size = size;957}958 959bool build_id__is_defined(const struct build_id *bid)960{961 return bid && bid->size ? !!memchr_inv(bid->data, 0, bid->size) : false;962}963