5 #include <util/bpf-loader.h>
6 #include <util/evlist.h>
8 #include <linux/filter.h>
15 #ifdef HAVE_LIBBPF_SUPPORT
17 static int epoll_wait_loop(void)
21 /* Should fail NR_ITERS times */
22 for (i = 0; i < NR_ITERS; i++)
23 epoll_wait(-(i + 1), NULL, 0, 0);
27 #ifdef HAVE_BPF_PROLOGUE
29 static int llseek_loop(void)
33 fds[0] = open("/dev/null", O_RDONLY);
34 fds[1] = open("/dev/null", O_RDWR);
36 if (fds[0] < 0 || fds[1] < 0)
39 for (i = 0; i < NR_ITERS; i++) {
40 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
41 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
51 enum test_llvm__testcase prog_id;
54 const char *msg_compile_fail;
55 const char *msg_load_fail;
56 int (*target_func)(void);
58 } bpf_testcase_table[] = {
61 "Test basic BPF filtering",
63 "fix 'perf test LLVM' first",
64 "load bpf object failed",
68 #ifdef HAVE_BPF_PROLOGUE
70 LLVM_TESTCASE_BPF_PROLOGUE,
71 "Test BPF prologue generation",
72 "[bpf_prologue_test]",
74 "check your vmlinux setting?",
80 LLVM_TESTCASE_BPF_RELOCATION,
81 "Test BPF relocation checker",
82 "[bpf_relocation_test]",
83 "fix 'perf test LLVM' first",
84 "libbpf error when dealing with relocation",
90 static int do_test(struct bpf_object *obj, int (*func)(void),
93 struct record_opts opts = {
100 .default_interval = 1,
104 char sbuf[STRERR_BUFSIZE];
105 struct perf_evlist *evlist;
106 int i, ret = TEST_FAIL, err = 0, count = 0;
108 struct parse_events_evlist parse_evlist;
109 struct parse_events_error parse_error;
111 bzero(&parse_error, sizeof(parse_error));
112 bzero(&parse_evlist, sizeof(parse_evlist));
113 parse_evlist.error = &parse_error;
114 INIT_LIST_HEAD(&parse_evlist.list);
116 err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj, NULL);
117 if (err || list_empty(&parse_evlist.list)) {
118 pr_debug("Failed to add events selected by BPF\n");
122 snprintf(pid, sizeof(pid), "%d", getpid());
123 pid[sizeof(pid) - 1] = '\0';
124 opts.target.tid = opts.target.pid = pid;
126 /* Instead of perf_evlist__new_default, don't add default events */
127 evlist = perf_evlist__new();
129 pr_debug("No enough memory to create evlist\n");
133 err = perf_evlist__create_maps(evlist, &opts.target);
135 pr_debug("Not enough memory to create thread/cpu maps\n");
136 goto out_delete_evlist;
139 perf_evlist__splice_list_tail(evlist, &parse_evlist.list);
140 evlist->nr_groups = parse_evlist.nr_groups;
142 perf_evlist__config(evlist, &opts, NULL);
144 err = perf_evlist__open(evlist);
146 pr_debug("perf_evlist__open: %s\n",
147 str_error_r(errno, sbuf, sizeof(sbuf)));
148 goto out_delete_evlist;
151 err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
153 pr_debug("perf_evlist__mmap: %s\n",
154 str_error_r(errno, sbuf, sizeof(sbuf)));
155 goto out_delete_evlist;
158 perf_evlist__enable(evlist);
160 perf_evlist__disable(evlist);
162 for (i = 0; i < evlist->nr_mmaps; i++) {
163 union perf_event *event;
165 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
166 const u32 type = event->header.type;
168 if (type == PERF_RECORD_SAMPLE)
173 if (count != expect) {
174 pr_debug("BPF filter result incorrect\n");
175 goto out_delete_evlist;
181 perf_evlist__delete(evlist);
185 static struct bpf_object *
186 prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
188 struct bpf_object *obj;
190 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
192 pr_debug("Compile BPF program failed.\n");
198 static int __test__bpf(int idx)
203 struct bpf_object *obj;
205 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
206 bpf_testcase_table[idx].prog_id,
208 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
209 pr_debug("Unable to get BPF object, %s\n",
210 bpf_testcase_table[idx].msg_compile_fail);
217 obj = prepare_bpf(obj_buf, obj_buf_sz,
218 bpf_testcase_table[idx].name);
219 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
221 pr_debug("Fail to load BPF object: %s\n",
222 bpf_testcase_table[idx].msg_load_fail);
224 pr_debug("Success unexpectedly: %s\n",
225 bpf_testcase_table[idx].msg_load_fail);
232 bpf_testcase_table[idx].target_func,
233 bpf_testcase_table[idx].expect_result);
240 int test__bpf_subtest_get_nr(void)
242 return (int)ARRAY_SIZE(bpf_testcase_table);
245 const char *test__bpf_subtest_get_desc(int i)
247 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
249 return bpf_testcase_table[i].desc;
252 static int check_env(void)
255 unsigned int kver_int;
256 char license[] = "GPL";
258 struct bpf_insn insns[] = {
259 BPF_MOV64_IMM(BPF_REG_0, 1),
263 err = fetch_kernel_version(&kver_int, NULL, 0);
265 pr_debug("Unable to get kernel version\n");
269 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
270 sizeof(insns) / sizeof(insns[0]),
271 license, kver_int, NULL, 0);
273 pr_err("Missing basic BPF support, skip this test: %s\n",
286 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
289 if (geteuid() != 0) {
290 pr_debug("Only root can run BPF test\n");
297 err = __test__bpf(i);
302 int test__bpf_subtest_get_nr(void)
307 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
312 int test__bpf(int i __maybe_unused)
314 pr_debug("Skip BPF test because BPF support is not compiled\n");