4 #include <util/bpf-loader.h>
5 #include <util/evlist.h>
7 #include <linux/filter.h>
14 #ifdef HAVE_LIBBPF_SUPPORT
16 static int epoll_wait_loop(void)
20 /* Should fail NR_ITERS times */
21 for (i = 0; i < NR_ITERS; i++)
22 epoll_wait(-(i + 1), NULL, 0, 0);
26 #ifdef HAVE_BPF_PROLOGUE
28 static int llseek_loop(void)
32 fds[0] = open("/dev/null", O_RDONLY);
33 fds[1] = open("/dev/null", O_RDWR);
35 if (fds[0] < 0 || fds[1] < 0)
38 for (i = 0; i < NR_ITERS; i++) {
39 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
40 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
50 enum test_llvm__testcase prog_id;
53 const char *msg_compile_fail;
54 const char *msg_load_fail;
55 int (*target_func)(void);
57 } bpf_testcase_table[] = {
60 "Basic BPF filtering",
62 "fix 'perf test LLVM' first",
63 "load bpf object failed",
67 #ifdef HAVE_BPF_PROLOGUE
69 LLVM_TESTCASE_BPF_PROLOGUE,
70 "BPF prologue generation",
71 "[bpf_prologue_test]",
73 "check your vmlinux setting?",
79 LLVM_TESTCASE_BPF_RELOCATION,
80 "BPF relocation checker",
81 "[bpf_relocation_test]",
82 "fix 'perf test LLVM' first",
83 "libbpf error when dealing with relocation",
89 static int do_test(struct bpf_object *obj, int (*func)(void),
92 struct record_opts opts = {
99 .default_interval = 1,
103 char sbuf[STRERR_BUFSIZE];
104 struct perf_evlist *evlist;
105 int i, ret = TEST_FAIL, err = 0, count = 0;
107 struct parse_events_evlist parse_evlist;
108 struct parse_events_error parse_error;
110 bzero(&parse_error, sizeof(parse_error));
111 bzero(&parse_evlist, sizeof(parse_evlist));
112 parse_evlist.error = &parse_error;
113 INIT_LIST_HEAD(&parse_evlist.list);
115 err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj, NULL);
116 if (err || list_empty(&parse_evlist.list)) {
117 pr_debug("Failed to add events selected by BPF\n");
121 snprintf(pid, sizeof(pid), "%d", getpid());
122 pid[sizeof(pid) - 1] = '\0';
123 opts.target.tid = opts.target.pid = pid;
125 /* Instead of perf_evlist__new_default, don't add default events */
126 evlist = perf_evlist__new();
128 pr_debug("Not enough memory to create evlist\n");
132 err = perf_evlist__create_maps(evlist, &opts.target);
134 pr_debug("Not enough memory to create thread/cpu maps\n");
135 goto out_delete_evlist;
138 perf_evlist__splice_list_tail(evlist, &parse_evlist.list);
139 evlist->nr_groups = parse_evlist.nr_groups;
141 perf_evlist__config(evlist, &opts, NULL);
143 err = perf_evlist__open(evlist);
145 pr_debug("perf_evlist__open: %s\n",
146 str_error_r(errno, sbuf, sizeof(sbuf)));
147 goto out_delete_evlist;
150 err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
152 pr_debug("perf_evlist__mmap: %s\n",
153 str_error_r(errno, sbuf, sizeof(sbuf)));
154 goto out_delete_evlist;
157 perf_evlist__enable(evlist);
159 perf_evlist__disable(evlist);
161 for (i = 0; i < evlist->nr_mmaps; i++) {
162 union perf_event *event;
164 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
165 const u32 type = event->header.type;
167 if (type == PERF_RECORD_SAMPLE)
172 if (count != expect) {
173 pr_debug("BPF filter result incorrect\n");
174 goto out_delete_evlist;
180 perf_evlist__delete(evlist);
184 static struct bpf_object *
185 prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
187 struct bpf_object *obj;
189 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
191 pr_debug("Compile BPF program failed.\n");
197 static int __test__bpf(int idx)
202 struct bpf_object *obj;
204 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
205 bpf_testcase_table[idx].prog_id,
207 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
208 pr_debug("Unable to get BPF object, %s\n",
209 bpf_testcase_table[idx].msg_compile_fail);
216 obj = prepare_bpf(obj_buf, obj_buf_sz,
217 bpf_testcase_table[idx].name);
218 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
220 pr_debug("Fail to load BPF object: %s\n",
221 bpf_testcase_table[idx].msg_load_fail);
223 pr_debug("Success unexpectedly: %s\n",
224 bpf_testcase_table[idx].msg_load_fail);
231 bpf_testcase_table[idx].target_func,
232 bpf_testcase_table[idx].expect_result);
238 int test__bpf_subtest_get_nr(void)
240 return (int)ARRAY_SIZE(bpf_testcase_table);
243 const char *test__bpf_subtest_get_desc(int i)
245 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
247 return bpf_testcase_table[i].desc;
250 static int check_env(void)
253 unsigned int kver_int;
254 char license[] = "GPL";
256 struct bpf_insn insns[] = {
257 BPF_MOV64_IMM(BPF_REG_0, 1),
261 err = fetch_kernel_version(&kver_int, NULL, 0);
263 pr_debug("Unable to get kernel version\n");
267 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
268 sizeof(insns) / sizeof(insns[0]),
269 license, kver_int, NULL, 0);
271 pr_err("Missing basic BPF support, skip this test: %s\n",
284 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
287 if (geteuid() != 0) {
288 pr_debug("Only root can run BPF test\n");
295 err = __test__bpf(i);
300 int test__bpf_subtest_get_nr(void)
305 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
310 int test__bpf(int i __maybe_unused)
312 pr_debug("Skip BPF test because BPF support is not compiled\n");