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perf tools: Introduce dso__decompress_kmodule_{fd,path} 

Move decompress_kmodule() to util/dso.c and split it into two functions
returning fd and (decompressed) file path.  The existing user only wants
the fd version but the path version will be used soon.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20170608073109.30699-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2017-06-08 16:31:03 +09:00 committed by Arnaldo Carvalho de Melo
parent 44ad6b8852
commit 42b3fa6708
3 changed files with 65 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
tools/perf/util/dso.c
View File

@ -248,6 +248,64 @@ bool dso__needs_decompress(struct dso *dso)
dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
}
static int decompress_kmodule(struct dso *dso, const char *name, char *tmpbuf)
{
int fd = -1;
struct kmod_path m;
if (!dso__needs_decompress(dso))
return -1;
if (kmod_path__parse_ext(&m, dso->long_name))
return -1;
if (!m.comp)
goto out;
fd = mkstemp(tmpbuf);
if (fd < 0) {
dso->load_errno = errno;
goto out;
}
if (!decompress_to_file(m.ext, name, fd)) {
dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
close(fd);
fd = -1;
}
out:
free(m.ext);
return fd;
}
int dso__decompress_kmodule_fd(struct dso *dso, const char *name)
{
char tmpbuf[] = KMOD_DECOMP_NAME;
int fd;
fd = decompress_kmodule(dso, name, tmpbuf);
unlink(tmpbuf);
return fd;
}
int dso__decompress_kmodule_path(struct dso *dso, const char *name,
char *pathname, size_t len)
{
char tmpbuf[] = KMOD_DECOMP_NAME;
int fd;
fd = decompress_kmodule(dso, name, tmpbuf);
if (fd < 0) {
unlink(tmpbuf);
return -1;
}
strncpy(pathname, tmpbuf, len);
close(fd);
return 0;
}
/*
* Parses kernel module specified in @path and updates
* @m argument like:

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

@ -244,6 +244,12 @@ bool is_supported_compression(const char *ext);
bool is_kernel_module(const char *pathname, int cpumode);
bool decompress_to_file(const char *ext, const char *filename, int output_fd);
bool dso__needs_decompress(struct dso *dso);
int dso__decompress_kmodule_fd(struct dso *dso, const char *name);
int dso__decompress_kmodule_path(struct dso *dso, const char *name,
char *pathname, size_t len);
#define KMOD_DECOMP_NAME "/tmp/perf-kmod-XXXXXX"
#define KMOD_DECOMP_LEN sizeof(KMOD_DECOMP_NAME)
struct kmod_path {
char *name;

36
tools/perf/util/symbol-elf.c
View File

@ -637,40 +637,6 @@ static int dso__swap_init(struct dso *dso, unsigned char eidata)
return 0;
}
static int decompress_kmodule(struct dso *dso, const char *name,
enum dso_binary_type type)
{
int fd = -1;
char tmpbuf[] = "/tmp/perf-kmod-XXXXXX";
struct kmod_path m;
if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP &&
type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
return -1;
if (kmod_path__parse_ext(&m, dso->long_name) || !m.comp)
return -1;
fd = mkstemp(tmpbuf);
if (fd < 0) {
dso->load_errno = errno;
goto out;
}
if (!decompress_to_file(m.ext, name, fd)) {
dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
close(fd);
fd = -1;
}
unlink(tmpbuf);
out:
free(m.ext);
return fd;
}
bool symsrc__possibly_runtime(struct symsrc *ss)
{
return ss->dynsym || ss->opdsec;
@ -702,7 +668,7 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
int fd;
if (dso__needs_decompress(dso)) {
fd = decompress_kmodule(dso, name, type);
fd = dso__decompress_kmodule_fd(dso, name);
if (fd < 0)
return -1;
} else {