1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <stdio.h> 4 #include <sys/epoll.h> 5 #include <util/evlist.h> 6 #include <linux/filter.h> 7 #include "tests.h" 8 #include "debug.h" 9 #include "probe-file.h" 10 #include "build-id.h" 11 12 /* To test SDT event, we need libelf support to scan elf binary */ 13 #if defined(HAVE_SDT_EVENT) && defined(HAVE_LIBELF_SUPPORT) 14 15 #include <sys/sdt.h> 16 17 static int target_function(void) 18 { 19 DTRACE_PROBE(perf, test_target); 20 return TEST_OK; 21 } 22 23 /* Copied from builtin-buildid-cache.c */ 24 static int build_id_cache__add_file(const char *filename) 25 { 26 char sbuild_id[SBUILD_ID_SIZE]; 27 u8 build_id[BUILD_ID_SIZE]; 28 int err; 29 30 err = filename__read_build_id(filename, &build_id, sizeof(build_id)); 31 if (err < 0) { 32 pr_debug("Failed to read build id of %s\n", filename); 33 return err; 34 } 35 36 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 37 err = build_id_cache__add_s(sbuild_id, filename, NULL, false, false); 38 if (err < 0) 39 pr_debug("Failed to add build id cache of %s\n", filename); 40 return err; 41 } 42 43 static char *get_self_path(void) 44 { 45 char *buf = calloc(PATH_MAX, sizeof(char)); 46 47 if (buf && readlink("/proc/self/exe", buf, PATH_MAX - 1) < 0) { 48 pr_debug("Failed to get correct path of perf\n"); 49 free(buf); 50 return NULL; 51 } 52 return buf; 53 } 54 55 static int search_cached_probe(const char *target, 56 const char *group, const char *event) 57 { 58 struct probe_cache *cache = probe_cache__new(target, NULL); 59 int ret = 0; 60 61 if (!cache) { 62 pr_debug("Failed to open probe cache of %s\n", target); 63 return -EINVAL; 64 } 65 66 if (!probe_cache__find_by_name(cache, group, event)) { 67 pr_debug("Failed to find %s:%s in the cache\n", group, event); 68 ret = -ENOENT; 69 } 70 probe_cache__delete(cache); 71 72 return ret; 73 } 74 75 int test__sdt_event(struct test *test __maybe_unused, int subtests __maybe_unused) 76 { 77 int ret = TEST_FAIL; 78 char __tempdir[] = "./test-buildid-XXXXXX"; 79 char *tempdir = NULL, *myself = get_self_path(); 80 81 if (myself == NULL || mkdtemp(__tempdir) == NULL) { 82 pr_debug("Failed to make a tempdir for build-id cache\n"); 83 goto error; 84 } 85 /* Note that buildid_dir must be an absolute path */ 86 tempdir = realpath(__tempdir, NULL); 87 if (tempdir == NULL) 88 goto error_rmdir; 89 90 /* At first, scan itself */ 91 set_buildid_dir(tempdir); 92 if (build_id_cache__add_file(myself) < 0) 93 goto error_rmdir; 94 95 /* Open a cache and make sure the SDT is stored */ 96 if (search_cached_probe(myself, "sdt_perf", "test_target") < 0) 97 goto error_rmdir; 98 99 /* TBD: probing on the SDT event and collect logs */ 100 101 /* Call the target and get an event */ 102 ret = target_function(); 103 104 error_rmdir: 105 /* Cleanup temporary buildid dir */ 106 rm_rf(__tempdir); 107 error: 108 free(tempdir); 109 free(myself); 110 return ret; 111 } 112 #else 113 int test__sdt_event(struct test *test __maybe_unused, int subtests __maybe_unused) 114 { 115 pr_debug("Skip SDT event test because SDT support is not compiled\n"); 116 return TEST_SKIP; 117 } 118 #endif 119