8 #include <util/bpf-loader.h>
9 #include <util/evlist.h>
10 #include <linux/bpf.h>
11 #include <linux/filter.h>
12 #include <linux/kernel.h>
13 #include <api/fs/fs.h>
19 #define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
21 #ifdef HAVE_LIBBPF_SUPPORT
23 static int epoll_wait_loop(void)
27 /* Should fail NR_ITERS times */
28 for (i = 0; i < NR_ITERS; i++)
29 epoll_wait(-(i + 1), NULL, 0, 0);
33 #ifdef HAVE_BPF_PROLOGUE
35 static int llseek_loop(void)
39 fds[0] = open("/dev/null", O_RDONLY);
40 fds[1] = open("/dev/null", O_RDWR);
42 if (fds[0] < 0 || fds[1] < 0)
45 for (i = 0; i < NR_ITERS; i++) {
46 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
47 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
57 enum test_llvm__testcase prog_id;
60 const char *msg_compile_fail;
61 const char *msg_load_fail;
62 int (*target_func)(void);
65 } bpf_testcase_table[] = {
68 "Basic BPF filtering",
70 "fix 'perf test LLVM' first",
71 "load bpf object failed",
81 "check your vmlinux setting?",
86 #ifdef HAVE_BPF_PROLOGUE
88 LLVM_TESTCASE_BPF_PROLOGUE,
89 "BPF prologue generation",
90 "[bpf_prologue_test]",
92 "check your vmlinux setting?",
99 LLVM_TESTCASE_BPF_RELOCATION,
100 "BPF relocation checker",
101 "[bpf_relocation_test]",
102 "fix 'perf test LLVM' first",
103 "libbpf error when dealing with relocation",
110 static int do_test(struct bpf_object *obj, int (*func)(void),
113 struct record_opts opts = {
120 .default_interval = 1,
124 char sbuf[STRERR_BUFSIZE];
125 struct perf_evlist *evlist;
126 int i, ret = TEST_FAIL, err = 0, count = 0;
128 struct parse_events_state parse_state;
129 struct parse_events_error parse_error;
131 bzero(&parse_error, sizeof(parse_error));
132 bzero(&parse_state, sizeof(parse_state));
133 parse_state.error = &parse_error;
134 INIT_LIST_HEAD(&parse_state.list);
136 err = parse_events_load_bpf_obj(&parse_state, &parse_state.list, obj, NULL);
137 if (err || list_empty(&parse_state.list)) {
138 pr_debug("Failed to add events selected by BPF\n");
142 snprintf(pid, sizeof(pid), "%d", getpid());
143 pid[sizeof(pid) - 1] = '\0';
144 opts.target.tid = opts.target.pid = pid;
146 /* Instead of perf_evlist__new_default, don't add default events */
147 evlist = perf_evlist__new();
149 pr_debug("Not enough memory to create evlist\n");
153 err = perf_evlist__create_maps(evlist, &opts.target);
155 pr_debug("Not enough memory to create thread/cpu maps\n");
156 goto out_delete_evlist;
159 perf_evlist__splice_list_tail(evlist, &parse_state.list);
160 evlist->nr_groups = parse_state.nr_groups;
162 perf_evlist__config(evlist, &opts, NULL);
164 err = perf_evlist__open(evlist);
166 pr_debug("perf_evlist__open: %s\n",
167 str_error_r(errno, sbuf, sizeof(sbuf)));
168 goto out_delete_evlist;
171 err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
173 pr_debug("perf_evlist__mmap: %s\n",
174 str_error_r(errno, sbuf, sizeof(sbuf)));
175 goto out_delete_evlist;
178 perf_evlist__enable(evlist);
180 perf_evlist__disable(evlist);
182 for (i = 0; i < evlist->nr_mmaps; i++) {
183 union perf_event *event;
185 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
186 const u32 type = event->header.type;
188 if (type == PERF_RECORD_SAMPLE)
193 if (count != expect) {
194 pr_debug("BPF filter result incorrect\n");
195 goto out_delete_evlist;
201 perf_evlist__delete(evlist);
205 static struct bpf_object *
206 prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
208 struct bpf_object *obj;
210 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
212 pr_debug("Compile BPF program failed.\n");
218 static int __test__bpf(int idx)
223 struct bpf_object *obj;
225 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
226 bpf_testcase_table[idx].prog_id,
228 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
229 pr_debug("Unable to get BPF object, %s\n",
230 bpf_testcase_table[idx].msg_compile_fail);
237 obj = prepare_bpf(obj_buf, obj_buf_sz,
238 bpf_testcase_table[idx].name);
239 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
241 pr_debug("Fail to load BPF object: %s\n",
242 bpf_testcase_table[idx].msg_load_fail);
244 pr_debug("Success unexpectedly: %s\n",
245 bpf_testcase_table[idx].msg_load_fail);
252 bpf_testcase_table[idx].target_func,
253 bpf_testcase_table[idx].expect_result);
256 if (bpf_testcase_table[idx].pin) {
259 if (!bpf_fs__mount()) {
260 pr_debug("BPF filesystem not mounted\n");
264 err = mkdir(PERF_TEST_BPF_PATH, 0777);
265 if (err && errno != EEXIST) {
266 pr_debug("Failed to make perf_test dir: %s\n",
271 if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
273 if (rm_rf(PERF_TEST_BPF_PATH))
284 int test__bpf_subtest_get_nr(void)
286 return (int)ARRAY_SIZE(bpf_testcase_table);
289 const char *test__bpf_subtest_get_desc(int i)
291 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
293 return bpf_testcase_table[i].desc;
296 static int check_env(void)
299 unsigned int kver_int;
300 char license[] = "GPL";
302 struct bpf_insn insns[] = {
303 BPF_MOV64_IMM(BPF_REG_0, 1),
307 err = fetch_kernel_version(&kver_int, NULL, 0);
309 pr_debug("Unable to get kernel version\n");
313 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
314 sizeof(insns) / sizeof(insns[0]),
315 license, kver_int, NULL, 0);
317 pr_err("Missing basic BPF support, skip this test: %s\n",
326 int test__bpf(struct test *test __maybe_unused, int i)
330 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
333 if (geteuid() != 0) {
334 pr_debug("Only root can run BPF test\n");
341 err = __test__bpf(i);
346 int test__bpf_subtest_get_nr(void)
351 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
356 int test__bpf(struct test *test __maybe_unused, int i __maybe_unused)
358 pr_debug("Skip BPF test because BPF support is not compiled\n");