// SPDX-License-Identifier: GPL-2.0
/*
* build-id.c
*
* build-id support
*
* Copyright (C) 2009, 2010 Red Hat Inc.
* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <[email protected]>
*/
#include "util.h" // lsdir(), mkdir_p(), rm_rf()
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "util/copyfile.h"
#include "dso.h"
#include "build-id.h"
#include "event.h"
#include "namespaces.h"
#include "map.h"
#include "symbol.h"
#include "thread.h"
#include <linux/kernel.h>
#include "debug.h"
#include "session.h"
#include "tool.h"
#include "header.h"
#include "vdso.h"
#include "path.h"
#include "probe-file.h"
#include "strlist.h"
#ifdef HAVE_DEBUGINFOD_SUPPORT
#include <elfutils/debuginfod.h>
#endif
#include <linux/ctype.h>
#include <linux/zalloc.h>
#include <linux/string.h>
#include <asm/bug.h>
static bool no_buildid_cache;
int build_id__mark_dso_hit(const struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel __maybe_unused,
struct machine *machine)
{
struct addr_location al;
struct thread *thread = machine__findnew_thread(machine, sample->pid,
sample->tid);
if (thread == NULL) {
pr_err("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
addr_location__init(&al);
if (thread__find_map(thread, sample->cpumode, sample->ip, &al))
dso__set_hit(map__dso(al.map));
addr_location__exit(&al);
thread__put(thread);
return 0;
}
int build_id__sprintf(const struct build_id *build_id, char *bf)
{
char *bid = bf;
const u8 *raw = build_id->data;
size_t i;
bf[0] = 0x0;
for (i = 0; i < build_id->size; ++i) {
sprintf(bid, "%02x", *raw);
++raw;
bid += 2;
}
return (bid - bf) + 1;
}
int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
{
char notes[PATH_MAX];
struct build_id bid;
int ret;
if (!root_dir)
root_dir = "";
scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
ret = sysfs__read_build_id(notes, &bid);
if (ret < 0)
return ret;
return build_id__sprintf(&bid, sbuild_id);
}
int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
{
struct build_id bid;
int ret;
ret = filename__read_build_id(pathname, &bid);
if (ret < 0)
return ret;
return build_id__sprintf(&bid, sbuild_id);
}
/* asnprintf consolidates asprintf and snprintf */
static int asnprintf(char **strp, size_t size, const char *fmt, ...)
{
va_list ap;
int ret;
if (!strp)
return -EINVAL;
va_start(ap, fmt);
if (*strp)
ret = vsnprintf(*strp, size, fmt, ap);
else
ret = vasprintf(strp, fmt, ap);
va_end(ap);
return ret;
}
char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
size_t size)
{
bool retry_old = true;
snprintf(bf, size, "%s/%s/%s/kallsyms",
buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
retry:
if (!access(bf, F_OK))
return bf;
if (retry_old) {
/* Try old style kallsyms cache */
snprintf(bf, size, "%s/%s/%s",
buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
retry_old = false;
goto retry;
}
return NULL;
}
char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
{
char *tmp = bf;
int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
sbuild_id, sbuild_id + 2);
if (ret < 0 || (tmp && size < (unsigned int)ret))
return NULL;
return bf;
}
/* The caller is responsible to free the returned buffer. */
char *build_id_cache__origname(const char *sbuild_id)
{
char *linkname;
char buf[PATH_MAX];
char *ret = NULL, *p;
size_t offs = 5; /* == strlen("../..") */
ssize_t len;
linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
if (!linkname)
return NULL;
len = readlink(linkname, buf, sizeof(buf) - 1);
if (len <= 0)
goto out;
buf[len] = '\0';
/* The link should be "../..<origpath>/<sbuild_id>" */
p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
if (p && (p > buf + offs)) {
*p = '\0';
if (buf[offs + 1] == '[')
offs++; /*
* This is a DSO name, like [kernel.kallsyms].
* Skip the first '/', since this is not the
* cache of a regular file.
*/
ret = strdup(buf + offs); /* Skip "../..[/]" */
}
out:
free(linkname);
return ret;
}
/* Check if the given build_id cache is valid on current running system */
static bool build_id_cache__valid_id(char *sbuild_id)
{
char real_sbuild_id[SBUILD_ID_SIZE] = "";
char *pathname;
int ret = 0;
bool result = false;
pathname = build_id_cache__origname(sbuild_id);
if (!pathname)
return false;
if (!strcmp(pathname, DSO__NAME_KALLSYMS))
ret = sysfs__sprintf_build_id("/", real_sbuild_id);
else if (pathname[0] == '/')
ret = filename__sprintf_build_id(pathname, real_sbuild_id);
else
ret = -EINVAL; /* Should we support other special DSO cache? */
if (ret >= 0)
result = (strcmp(sbuild_id, real_sbuild_id) == 0);
free(pathname);
return result;
}
static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
bool is_debug)
{
return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?
"debug" : "elf"));
}
char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
bool is_debug, bool is_kallsyms)
{
bool is_vdso = dso__is_vdso((struct dso *)dso);
char sbuild_id[SBUILD_ID_SIZE];
char *linkname;
bool alloc = (bf == NULL);
int ret;
if (!dso__has_build_id(dso))
return NULL;
build_id__sprintf(dso__bid_const(dso), sbuild_id);
linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
if (!linkname)
return NULL;
/* Check if old style build_id cache */
if (is_regular_file(linkname))
ret = asnprintf(&bf, size, "%s", linkname);
else
ret = asnprintf(&bf, size, "%s/%s", linkname,
build_id_cache__basename(is_kallsyms, is_vdso,
is_debug));
if (ret < 0 || (!alloc && size < (unsigned int)ret))
bf = NULL;
free(linkname);
return bf;
}
char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
bool is_debug)
{
bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms);
}
static int write_buildid(const char *name, size_t name_len, struct build_id *bid,
pid_t pid, u16 misc, struct feat_fd *fd)
{
int err;
struct perf_record_header_build_id b;
size_t len;
len = sizeof(b) + name_len + 1;
len = PERF_ALIGN(len, sizeof(u64));
memset(&b, 0, sizeof(b));
memcpy(&b.data, bid->data, bid->size);
b.size = (u8) bid->size;
misc |= PERF_RECORD_MISC_BUILD_ID_SIZE;
b.pid = pid;
b.header.misc = misc;
b.header.size = len;
err = do_write(fd, &b, sizeof(b));
if (err < 0)
return err;
return write_padded(fd, name, name_len + 1, len);
}
struct machine__write_buildid_table_cb_args {
struct machine *machine;
struct feat_fd *fd;
u16 kmisc, umisc;
};
static int machine__write_buildid_table_cb(struct dso *dso, void *data)
{
struct machine__write_buildid_table_cb_args *args = data;
const char *name;
size_t name_len;
bool in_kernel = false;
if (!dso__has_build_id(dso))
return 0;
if (!dso__hit(dso) && !dso__is_vdso(dso))
return 0;
if (dso__is_vdso(dso)) {
name = dso__short_name(dso);
name_len = dso__short_name_len(dso);
} else if (dso__is_kcore(dso)) {
name = args->machine->mmap_name;
name_len = strlen(name);
} else {
name = dso__long_name(dso);
name_len = dso__long_name_len(dso);
}
in_kernel = dso__kernel(dso) || is_kernel_module(name, PERF_RECORD_MISC_CPUMODE_UNKNOWN);
return write_buildid(name, name_len, dso__bid(dso), args->machine->pid,
in_kernel ? args->kmisc : args->umisc, args->fd);
}
static int machine__write_buildid_table(struct machine *machine, struct feat_fd *fd)
{
struct machine__write_buildid_table_cb_args args = {
.machine = machine,
.fd = fd,
.kmisc = PERF_RECORD_MISC_KERNEL,
.umisc = PERF_RECORD_MISC_USER,
};
if (!machine__is_host(machine)) {
args.kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
args.umisc = PERF_RECORD_MISC_GUEST_USER;
}
return dsos__for_each_dso(&machine->dsos, machine__write_buildid_table_cb, &args);
}
int perf_session__write_buildid_table(struct perf_session *session,
struct feat_fd *fd)
{
struct rb_node *nd;
int err = machine__write_buildid_table(&session->machines.host, fd);
if (err)
return err;
for (nd = rb_first_cached(&session->machines.guests); nd;
nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
err = machine__write_buildid_table(pos, fd);
if (err)
break;
}
return err;
}
void disable_buildid_cache(void)
{
no_buildid_cache = true;
}
static bool lsdir_bid_head_filter(const char *name __maybe_unused,
struct dirent *d)
{
return (strlen(d->d_name) == 2) &&
isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
}
static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
struct dirent *d)
{
int i = 0;
while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
i++;
return (i >= SBUILD_ID_MIN_SIZE - 3) && (i <= SBUILD_ID_SIZE - 3) &&
(d->d_name[i] == '\0');
}
struct strlist *build_id_cache__list_all(bool validonly)
{
struct strlist *toplist, *linklist = NULL, *bidlist;
struct str_node *nd, *nd2;
char *topdir, *linkdir = NULL;
char sbuild_id[SBUILD_ID_SIZE];
/* for filename__ functions */
if (validonly)
symbol__init(NULL);
/* Open the top-level directory */
if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
return NULL;
bidlist = strlist__new(NULL, NULL);
if (!bidlist)
goto out;
toplist = lsdir(topdir, lsdir_bid_head_filter);
if (!toplist) {
pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
/* If there is no buildid cache, return an empty list */
if (errno == ENOENT)
goto out;
goto err_out;
}
strlist__for_each_entry(nd, toplist) {
if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
goto err_out;
/* Open the lower-level directory */
linklist = lsdir(linkdir, lsdir_bid_tail_filter);
if (!linklist) {
pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
goto err_out;
}
strlist__for_each_entry(nd2, linklist) {
if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
nd->s, nd2->s) > SBUILD_ID_SIZE - 1)
goto err_out;
if (validonly && !build_id_cache__valid_id(sbuild_id))
continue;
if (strlist__add(bidlist, sbuild_id) < 0)
goto err_out;
}
strlist__delete(linklist);
zfree(&linkdir);
}
out_free:
strlist__delete(toplist);
out:
free(topdir);
return bidlist;
err_out:
strlist__delete(linklist);
zfree(&linkdir);
strlist__delete(bidlist);
bidlist = NULL;
goto out_free;
}
static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
{
size_t i;
for (i = 0; i < len; i++) {
if (!isxdigit(maybe_sbuild_id[i]))
return false;
}
return true;
}
/* Return the valid complete build-id */
char *build_id_cache__complement(const char *incomplete_sbuild_id)
{
struct strlist *bidlist;
struct str_node *nd, *cand = NULL;
char *sbuild_id = NULL;
size_t len = strlen(incomplete_sbuild_id);
if (len >= SBUILD_ID_SIZE ||
!str_is_build_id(incomplete_sbuild_id, len))
return NULL;
bidlist = build_id_cache__list_all(true);
if (!bidlist)
return NULL;
strlist__for_each_entry(nd, bidlist) {
if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
continue;
if (cand) { /* Error: There are more than 2 candidates. */
cand = NULL;
break;
}
cand = nd;
}
if (cand)
sbuild_id = strdup(cand->s);
strlist__delete(bidlist);
return sbuild_id;
}
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
struct nsinfo *nsi, bool is_kallsyms,
bool is_vdso)
{
char *realname = NULL, *filename;
bool slash = is_kallsyms || is_vdso;
if (!slash)
realname = nsinfo__realpath(name, nsi);
if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
is_vdso ? DSO__NAME_VDSO : (realname ? realname : name),
sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
filename = NULL;
free(realname);
return filename;
}
int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
struct strlist **result)
{
char *dir_name;
int ret = 0;
dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
if (!dir_name)
return -ENOMEM;
*result = lsdir(dir_name, lsdir_no_dot_filter);
if (!*result)
ret = -errno;
free(dir_name);
return ret;
}
#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
static int build_id_cache__add_sdt_cache(const char *sbuild_id,
const char *realname,
struct nsinfo *nsi)
{
struct probe_cache *cache;
int ret;
struct nscookie nsc;
cache = probe_cache__new(sbuild_id, nsi);
if (!cache)
return -1;
nsinfo__mountns_enter(nsi, &nsc);
ret = probe_cache__scan_sdt(cache, realname);
nsinfo__mountns_exit(&nsc);
if (ret >= 0) {
pr_debug4("Found %d SDTs in %s\n", ret, realname);
if (probe_cache__commit(cache) < 0)
ret = -1;
}
probe_cache__delete(cache);
return ret;
}
#else
#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
#endif
static char *build_id_cache__find_debug(const char *sbuild_id,
struct nsinfo *nsi,
const char *root_dir)
{
const char *dirname = "/usr/lib/debug/.build-id/";
char *realname = NULL;
char dirbuf[PATH_MAX];
char *debugfile;
struct nscookie nsc;
size_t len = 0;
debugfile = calloc(1, PATH_MAX);
if (!debugfile)
goto out;
if (root_dir) {
path__join(dirbuf, PATH_MAX, root_dir, dirname);
dirname = dirbuf;
}
len = __symbol__join_symfs(debugfile, PATH_MAX, dirname);
snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
sbuild_id + 2);
nsinfo__mountns_enter(nsi, &nsc);
realname = realpath(debugfile, NULL);
if (realname && access(realname, R_OK))
zfree(&realname);
nsinfo__mountns_exit(&nsc);
#ifdef HAVE_DEBUGINFOD_SUPPORT
if (realname == NULL) {
debuginfod_client* c;
pr_debug("Downloading debug info with build id %s\n", sbuild_id);
c = debuginfod_begin();
if (c != NULL) {
int fd = debuginfod_find_debuginfo(c,
(const unsigned char*)sbuild_id, 0,
&realname);
if (fd >= 0)
close(fd); /* retaining reference by realname */
debuginfod_end(c);
}
}
#endif
out:
free(debugfile);
return realname;
}
int
build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
const char *proper_name, const char *root_dir)
{
const size_t size = PATH_MAX;
char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp;
char *debugfile = NULL;
int err = -1;
if (!proper_name)
proper_name = name;
dir_name = build_id_cache__cachedir(sbuild_id, proper_name, nsi, is_kallsyms,
is_vdso);
if (!dir_name)
goto out_free;
/* Remove old style build-id cache */
if (is_regular_file(dir_name))
if (unlink(dir_name))
goto out_free;
if (mkdir_p(dir_name, 0755))
goto out_free;
/* Save the allocated buildid dirname */
if (asprintf(&filename, "%s/%s", dir_name,
build_id_cache__basename(is_kallsyms, is_vdso,
false)) < 0) {
filename = NULL;
goto out_free;
}
if (access(filename, F_OK)) {
if (is_kallsyms) {
if (copyfile("/proc/kallsyms", filename))
goto out_free;
} else if (nsi && nsinfo__need_setns(nsi)) {
if (copyfile_ns(name, filename, nsi))
goto out_free;
} else if (link(realname, filename) && errno != EEXIST) {
struct stat f_stat;
if (!(stat(name, &f_stat) < 0) &&
copyfile_mode(name, filename, f_stat.st_mode))
goto out_free;
}
}
/* Some binaries are stripped, but have .debug files with their symbol
* table. Check to see if we can locate one of those, since the elf
* file itself may not be very useful to users of our tools without a
* symtab.
*/
if (!is_kallsyms && !is_vdso &&
strncmp(".ko", name + strlen(name) - 3, 3)) {
debugfile = build_id_cache__find_debug(sbuild_id, nsi, root_dir);
if (debugfile) {
zfree(&filename);
if (asprintf(&filename, "%s/%s", dir_name,
build_id_cache__basename(false, false, true)) < 0) {
filename = NULL;
goto out_free;
}
if (access(filename, F_OK)) {
if (nsi && nsinfo__need_setns(nsi)) {
if (copyfile_ns(debugfile, filename,
nsi))
goto out_free;
} else if (link(debugfile, filename) &&
errno != EEXIST &&
copyfile(debugfile, filename))
goto out_free;
}
}
}
if (!build_id_cache__linkname(sbuild_id, linkname, size))
goto out_free;
tmp = strrchr(linkname, '/');
*tmp = '\0';
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
goto out_free;
*tmp = '/';
tmp = dir_name + strlen(buildid_dir) - 5;
memcpy(tmp, "../..", 5);
if (symlink(tmp, linkname) == 0) {
err = 0;
} else if (errno == EEXIST) {
char path[PATH_MAX];
ssize_t len;
len = readlink(linkname, path, sizeof(path) - 1);
if (len <= 0) {
pr_err("Can't read link: %s\n", linkname);
goto out_free;
}
path[len] = '\0';
if (strcmp(tmp, path)) {
pr_debug("build <%s> already linked to %s\n",
sbuild_id, linkname);
}
err = 0;
}
/* Update SDT cache : error is just warned */
if (realname &&
build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
out_free:
free(filename);
free(debugfile);
free(dir_name);
free(linkname);
return err;
}
int __build_id_cache__add_s(const char *sbuild_id, const char *name,
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
const char *proper_name, const char *root_dir)
{
char *realname = NULL;
int err = -1;
if (!is_kallsyms) {
if (!is_vdso)
realname = nsinfo__realpath(name, nsi);
else
realname = realpath(name, NULL);
if (!realname)
goto out_free;
}
err = build_id_cache__add(sbuild_id, name, realname, nsi,
is_kallsyms, is_vdso, proper_name, root_dir);
out_free:
if (!is_kallsyms)
free(realname);
return err;
}
static int build_id_cache__add_b(const struct build_id *bid,
const char *name, struct nsinfo *nsi,
bool is_kallsyms, bool is_vdso,
const char *proper_name,
const char *root_dir)
{
char sbuild_id[SBUILD_ID_SIZE];
build_id__sprintf(bid, sbuild_id);
return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
is_vdso, proper_name, root_dir);
}
bool build_id_cache__cached(const char *sbuild_id)
{
bool ret = false;
char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
if (filename && !access(filename, F_OK))
ret = true;
free(filename);
return ret;
}
int build_id_cache__remove_s(const char *sbuild_id)
{
const size_t size = PATH_MAX;
char *filename = zalloc(size),
*linkname = zalloc(size), *tmp;
int err = -1;
if (filename == NULL || linkname == NULL)
goto out_free;
if (!build_id_cache__linkname(sbuild_id, linkname, size))
goto out_free;
if (access(linkname, F_OK))
goto out_free;
if (readlink(linkname, filename, size - 1) < 0)
goto out_free;
if (unlink(linkname))
goto out_free;
/*
* Since the link is relative, we must make it absolute:
*/
tmp = strrchr(linkname, '/') + 1;
snprintf(tmp, size - (tmp - linkname), "%s", filename);
if (rm_rf(linkname))
goto out_free;
err = 0;
out_free:
free(filename);
free(linkname);
return err;
}
static int filename__read_build_id_ns(const char *filename,
struct build_id *bid,
struct nsinfo *nsi)
{
struct nscookie nsc;
int ret;
nsinfo__mountns_enter(nsi, &nsc);
ret = filename__read_build_id(filename, bid);
nsinfo__mountns_exit(&nsc);
return ret;
}
static bool dso__build_id_mismatch(struct dso *dso, const char *name)
{
struct build_id bid;
bool ret = false;
mutex_lock(dso__lock(dso));
if (filename__read_build_id_ns(name, &bid, dso__nsinfo(dso)) >= 0)
ret = !dso__build_id_equal(dso, &bid);
mutex_unlock(dso__lock(dso));
return ret;
}
static int dso__cache_build_id(struct dso *dso, struct machine *machine,
void *priv __maybe_unused)
{
bool is_kallsyms = dso__is_kallsyms(dso);
bool is_vdso = dso__is_vdso(dso);
const char *name = dso__long_name(dso);
const char *proper_name = NULL;
const char *root_dir = NULL;
char *allocated_name = NULL;
int ret = 0;
if (!dso__has_build_id(dso))
return 0;
if (dso__is_kcore(dso)) {
is_kallsyms = true;
name = machine->mmap_name;
}
if (!machine__is_host(machine)) {
if (*machine->root_dir) {
root_dir = machine->root_dir;
ret = asprintf(&allocated_name, "%s/%s", root_dir, name);
if (ret < 0)
return ret;
proper_name = name;
name = allocated_name;
} else if (is_kallsyms) {
/* Cannot get guest kallsyms */
return 0;
}
}
if (!is_kallsyms && dso__build_id_mismatch(dso, name))
goto out_free;
mutex_lock(dso__lock(dso));
ret = build_id_cache__add_b(dso__bid(dso), name, dso__nsinfo(dso),
is_kallsyms, is_vdso, proper_name, root_dir);
mutex_unlock(dso__lock(dso));
out_free:
free(allocated_name);
return ret;
}
static int
machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv)
{
int ret = machine__for_each_dso(&machines->host, fn, priv);
struct rb_node *nd;
for (nd = rb_first_cached(&machines->guests); nd;
nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
ret |= machine__for_each_dso(pos, fn, priv);
}
return ret ? -1 : 0;
}
int __perf_session__cache_build_ids(struct perf_session *session,
machine__dso_t fn, void *priv)
{
if (no_buildid_cache)
return 0;
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
return -1;
return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0;
}
int perf_session__cache_build_ids(struct perf_session *session)
{
return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL);
}
static bool machine__read_build_ids(struct machine *machine, bool with_hits)
{
return dsos__read_build_ids(&machine->dsos, with_hits);
}
bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
{
struct rb_node *nd;
bool ret = machine__read_build_ids(&session->machines.host, with_hits);
for (nd = rb_first_cached(&session->machines.guests); nd;
nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
ret |= machine__read_build_ids(pos, with_hits);
}
return ret;
}
void build_id__init(struct build_id *bid, const u8 *data, size_t size)
{
WARN_ON(size > BUILD_ID_SIZE);
memcpy(bid->data, data, size);
bid->size = size;
}
bool build_id__is_defined(const struct build_id *bid)
{
return bid && bid->size ? !!memchr_inv(bid->data, 0, bid->size) : false;
}
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