tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
fork
Configure Feed
Select the types of activity you want to include in your feed.
1#include <errno.h>
2#include <stdio.h>
3#include <sys/epoll.h>
4#include <util/evlist.h>
5#include <linux/filter.h>
6#include "tests.h"
7#include "debug.h"
8#include "probe-file.h"
9#include "build-id.h"
10
11/* To test SDT event, we need libelf support to scan elf binary */
12#if defined(HAVE_SDT_EVENT) && defined(HAVE_LIBELF_SUPPORT)
13
14#include <sys/sdt.h>
15
16static int target_function(void)
17{
18 DTRACE_PROBE(perf, test_target);
19 return TEST_OK;
20}
21
22/* Copied from builtin-buildid-cache.c */
23static int build_id_cache__add_file(const char *filename)
24{
25 char sbuild_id[SBUILD_ID_SIZE];
26 u8 build_id[BUILD_ID_SIZE];
27 int err;
28
29 err = filename__read_build_id(filename, &build_id, sizeof(build_id));
30 if (err < 0) {
31 pr_debug("Failed to read build id of %s\n", filename);
32 return err;
33 }
34
35 build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
36 err = build_id_cache__add_s(sbuild_id, filename, false, false);
37 if (err < 0)
38 pr_debug("Failed to add build id cache of %s\n", filename);
39 return err;
40}
41
42static char *get_self_path(void)
43{
44 char *buf = calloc(PATH_MAX, sizeof(char));
45
46 if (buf && readlink("/proc/self/exe", buf, PATH_MAX - 1) < 0) {
47 pr_debug("Failed to get correct path of perf\n");
48 free(buf);
49 return NULL;
50 }
51 return buf;
52}
53
54static int search_cached_probe(const char *target,
55 const char *group, const char *event)
56{
57 struct probe_cache *cache = probe_cache__new(target);
58 int ret = 0;
59
60 if (!cache) {
61 pr_debug("Failed to open probe cache of %s\n", target);
62 return -EINVAL;
63 }
64
65 if (!probe_cache__find_by_name(cache, group, event)) {
66 pr_debug("Failed to find %s:%s in the cache\n", group, event);
67 ret = -ENOENT;
68 }
69 probe_cache__delete(cache);
70
71 return ret;
72}
73
74int test__sdt_event(int subtests __maybe_unused)
75{
76 int ret = TEST_FAIL;
77 char __tempdir[] = "./test-buildid-XXXXXX";
78 char *tempdir = NULL, *myself = get_self_path();
79
80 if (myself == NULL || mkdtemp(__tempdir) == NULL) {
81 pr_debug("Failed to make a tempdir for build-id cache\n");
82 goto error;
83 }
84 /* Note that buildid_dir must be an absolute path */
85 tempdir = realpath(__tempdir, NULL);
86
87 /* At first, scan itself */
88 set_buildid_dir(tempdir);
89 if (build_id_cache__add_file(myself) < 0)
90 goto error_rmdir;
91
92 /* Open a cache and make sure the SDT is stored */
93 if (search_cached_probe(myself, "sdt_perf", "test_target") < 0)
94 goto error_rmdir;
95
96 /* TBD: probing on the SDT event and collect logs */
97
98 /* Call the target and get an event */
99 ret = target_function();
100
101error_rmdir:
102 /* Cleanup temporary buildid dir */
103 rm_rf(tempdir);
104error:
105 free(tempdir);
106 free(myself);
107 return ret;
108}
109#else
110int test__sdt_event(int subtests __maybe_unused)
111{
112 pr_debug("Skip SDT event test because SDT support is not compiled\n");
113 return TEST_SKIP;
114}
115#endif