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perf tools: Pass build id object to sysfs__read_build_id()

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Passing build id object to sysfs__read_build_id function, so it can
populate the size of the build_id object.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20201013192441.1299447-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2020-10-13 21:24:35 +02:00 committed by Arnaldo Carvalho de Melo
parent f766819cd5
commit 3ff1b8c8cc
6 changed files with 16 additions and 23 deletions
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6
tools/perf/util/build-id.c
View File

@ -113,7 +113,7 @@ int build_id__sprintf(const u8 *build_id, int len, char *bf)
int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
{
char notes[PATH_MAX];
u8 build_id[BUILD_ID_SIZE];
struct build_id bid;
int ret;
if (!root_dir)
@ -121,11 +121,11 @@ int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
ret = sysfs__read_build_id(notes, &bid);
if (ret < 0)
return ret;
return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
return build_id__sprintf(bid.data, sizeof(bid.data), sbuild_id);
}
int filename__sprintf_build_id(const char *pathname, char *sbuild_id)

6
tools/perf/util/dso.c
View File

@ -1346,8 +1346,7 @@ void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
if (machine__is_default_guest(machine))
return;
sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
if (sysfs__read_build_id(path, dso->bid.data,
sizeof(dso->bid.data)) == 0)
if (sysfs__read_build_id(path, &dso->bid) == 0)
dso->has_build_id = true;
}
@ -1365,8 +1364,7 @@ int dso__kernel_module_get_build_id(struct dso *dso,
"%s/sys/module/%.*s/notes/.note.gnu.build-id",
root_dir, (int)strlen(name) - 1, name);
if (sysfs__read_build_id(filename, dso->bid.data,
sizeof(dso->bid.data)) == 0)
if (sysfs__read_build_id(filename, &dso->bid) == 0)
dso->has_build_id = true;
return 0;

11
tools/perf/util/symbol-elf.c
View File

@ -595,13 +595,11 @@ int filename__read_build_id(const char *filename, struct build_id *bid)
#endif // HAVE_LIBBFD_BUILDID_SUPPORT
int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
int sysfs__read_build_id(const char *filename, struct build_id *bid)
{
size_t size = sizeof(bid->data);
int fd, err = -1;
if (size < BUILD_ID_SIZE)
goto out;
fd = open(filename, O_RDONLY);
if (fd < 0)
goto out;
@ -622,8 +620,9 @@ int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
break;
if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
size_t sz = min(descsz, size);
if (read(fd, build_id, sz) == (ssize_t)sz) {
memset(build_id + sz, 0, size - sz);
if (read(fd, bid->data, sz) == (ssize_t)sz) {
memset(bid->data + sz, 0, size - sz);
bid->size = sz;
err = 0;
break;
}

7
tools/perf/util/symbol-minimal.c
View File

@ -222,9 +222,8 @@ int filename__read_build_id(const char *filename, struct build_id *bid)
return ret;
}
int sysfs__read_build_id(const char *filename, void *build_id, size_t size __maybe_unused)
int sysfs__read_build_id(const char *filename, struct build_id *bid)
{
struct build_id bid;
int fd;
int ret = -1;
struct stat stbuf;
@ -246,9 +245,7 @@ int sysfs__read_build_id(const char *filename, void *build_id, size_t size __may
if (read(fd, buf, buf_size) != (ssize_t) buf_size)
goto out_free;
ret = read_build_id(buf, buf_size, &bid, false);
if (ret > 0)
memcpy(build_id, bid.data, bid.size);
ret = read_build_id(buf, buf_size, bid, false);
out_free:
free(buf);
out:

7
tools/perf/util/symbol.c
View File

@ -2122,7 +2122,7 @@ static bool filename__readable(const char *file)
static char *dso__find_kallsyms(struct dso *dso, struct map *map)
{
u8 host_build_id[BUILD_ID_SIZE];
struct build_id bid;
char sbuild_id[SBUILD_ID_SIZE];
bool is_host = false;
char path[PATH_MAX];
@ -2135,9 +2135,8 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
goto proc_kallsyms;
}
if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
sizeof(host_build_id)) == 0)
is_host = dso__build_id_equal(dso, host_build_id);
if (sysfs__read_build_id("/sys/kernel/notes", &bid) == 0)
is_host = dso__build_id_equal(dso, bid.data);
/* Try a fast path for /proc/kallsyms if possible */
if (is_host) {

2
tools/perf/util/symbol.h
View File

@ -144,7 +144,7 @@ struct symbol *dso__next_symbol(struct symbol *sym);
enum dso_type dso__type_fd(int fd);
int filename__read_build_id(const char *filename, struct build_id *id);
int sysfs__read_build_id(const char *filename, void *bf, size_t size);
int sysfs__read_build_id(const char *filename, struct build_id *bid);
int modules__parse(const char *filename, void *arg,
int (*process_module)(void *arg, const char *name,
u64 start, u64 size));