4 #include <util/bpf-loader.h>
5 #include <util/evlist.h>
7 #include <linux/filter.h>
14 #define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
16 #ifdef HAVE_LIBBPF_SUPPORT
18 static int epoll_wait_loop(void)
22 /* Should fail NR_ITERS times */
23 for (i = 0; i < NR_ITERS; i++)
24 epoll_wait(-(i + 1), NULL, 0, 0);
28 #ifdef HAVE_BPF_PROLOGUE
30 static int llseek_loop(void)
34 fds[0] = open("/dev/null", O_RDONLY);
35 fds[1] = open("/dev/null", O_RDWR);
37 if (fds[0] < 0 || fds[1] < 0)
40 for (i = 0; i < NR_ITERS; i++) {
41 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
42 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
52 enum test_llvm__testcase prog_id;
55 const char *msg_compile_fail;
56 const char *msg_load_fail;
57 int (*target_func)(void);
60 } bpf_testcase_table[] = {
63 "Basic BPF filtering",
65 "fix 'perf test LLVM' first",
66 "load bpf object failed",
76 "check your vmlinux setting?",
81 #ifdef HAVE_BPF_PROLOGUE
83 LLVM_TESTCASE_BPF_PROLOGUE,
84 "BPF prologue generation",
85 "[bpf_prologue_test]",
87 "check your vmlinux setting?",
94 LLVM_TESTCASE_BPF_RELOCATION,
95 "BPF relocation checker",
96 "[bpf_relocation_test]",
97 "fix 'perf test LLVM' first",
98 "libbpf error when dealing with relocation",
105 static int do_test(struct bpf_object *obj, int (*func)(void),
108 struct record_opts opts = {
115 .default_interval = 1,
119 char sbuf[STRERR_BUFSIZE];
120 struct perf_evlist *evlist;
121 int i, ret = TEST_FAIL, err = 0, count = 0;
123 struct parse_events_evlist parse_evlist;
124 struct parse_events_error parse_error;
126 bzero(&parse_error, sizeof(parse_error));
127 bzero(&parse_evlist, sizeof(parse_evlist));
128 parse_evlist.error = &parse_error;
129 INIT_LIST_HEAD(&parse_evlist.list);
131 err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj, NULL);
132 if (err || list_empty(&parse_evlist.list)) {
133 pr_debug("Failed to add events selected by BPF\n");
137 snprintf(pid, sizeof(pid), "%d", getpid());
138 pid[sizeof(pid) - 1] = '\0';
139 opts.target.tid = opts.target.pid = pid;
141 /* Instead of perf_evlist__new_default, don't add default events */
142 evlist = perf_evlist__new();
144 pr_debug("Not enough memory to create evlist\n");
148 err = perf_evlist__create_maps(evlist, &opts.target);
150 pr_debug("Not enough memory to create thread/cpu maps\n");
151 goto out_delete_evlist;
154 perf_evlist__splice_list_tail(evlist, &parse_evlist.list);
155 evlist->nr_groups = parse_evlist.nr_groups;
157 perf_evlist__config(evlist, &opts, NULL);
159 err = perf_evlist__open(evlist);
161 pr_debug("perf_evlist__open: %s\n",
162 str_error_r(errno, sbuf, sizeof(sbuf)));
163 goto out_delete_evlist;
166 err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
168 pr_debug("perf_evlist__mmap: %s\n",
169 str_error_r(errno, sbuf, sizeof(sbuf)));
170 goto out_delete_evlist;
173 perf_evlist__enable(evlist);
175 perf_evlist__disable(evlist);
177 for (i = 0; i < evlist->nr_mmaps; i++) {
178 union perf_event *event;
180 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
181 const u32 type = event->header.type;
183 if (type == PERF_RECORD_SAMPLE)
188 if (count != expect) {
189 pr_debug("BPF filter result incorrect\n");
190 goto out_delete_evlist;
196 perf_evlist__delete(evlist);
200 static struct bpf_object *
201 prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
203 struct bpf_object *obj;
205 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
207 pr_debug("Compile BPF program failed.\n");
213 static int __test__bpf(int idx)
218 struct bpf_object *obj;
220 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
221 bpf_testcase_table[idx].prog_id,
223 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
224 pr_debug("Unable to get BPF object, %s\n",
225 bpf_testcase_table[idx].msg_compile_fail);
232 obj = prepare_bpf(obj_buf, obj_buf_sz,
233 bpf_testcase_table[idx].name);
234 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
236 pr_debug("Fail to load BPF object: %s\n",
237 bpf_testcase_table[idx].msg_load_fail);
239 pr_debug("Success unexpectedly: %s\n",
240 bpf_testcase_table[idx].msg_load_fail);
247 bpf_testcase_table[idx].target_func,
248 bpf_testcase_table[idx].expect_result);
251 if (bpf_testcase_table[idx].pin) {
254 if (!bpf_fs__mount()) {
255 pr_debug("BPF filesystem not mounted\n");
259 err = mkdir(PERF_TEST_BPF_PATH, 0777);
260 if (err && errno != EEXIST) {
261 pr_debug("Failed to make perf_test dir: %s\n",
266 if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
268 if (rm_rf(PERF_TEST_BPF_PATH))
278 int test__bpf_subtest_get_nr(void)
280 return (int)ARRAY_SIZE(bpf_testcase_table);
283 const char *test__bpf_subtest_get_desc(int i)
285 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
287 return bpf_testcase_table[i].desc;
290 static int check_env(void)
293 unsigned int kver_int;
294 char license[] = "GPL";
296 struct bpf_insn insns[] = {
297 BPF_MOV64_IMM(BPF_REG_0, 1),
301 err = fetch_kernel_version(&kver_int, NULL, 0);
303 pr_debug("Unable to get kernel version\n");
307 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
308 sizeof(insns) / sizeof(insns[0]),
309 license, kver_int, NULL, 0);
311 pr_err("Missing basic BPF support, skip this test: %s\n",
324 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
327 if (geteuid() != 0) {
328 pr_debug("Only root can run BPF test\n");
335 err = __test__bpf(i);
340 int test__bpf_subtest_get_nr(void)
345 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
350 int test__bpf(int i __maybe_unused)
352 pr_debug("Skip BPF test because BPF support is not compiled\n");