7 #include <util/bpf-loader.h>
8 #include <util/evlist.h>
10 #include <linux/filter.h>
11 #include <linux/kernel.h>
12 #include <api/fs/fs.h>
18 #define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
20 #ifdef HAVE_LIBBPF_SUPPORT
22 static int epoll_wait_loop(void)
26 /* Should fail NR_ITERS times */
27 for (i = 0; i < NR_ITERS; i++)
28 epoll_wait(-(i + 1), NULL, 0, 0);
32 #ifdef HAVE_BPF_PROLOGUE
34 static int llseek_loop(void)
38 fds[0] = open("/dev/null", O_RDONLY);
39 fds[1] = open("/dev/null", O_RDWR);
41 if (fds[0] < 0 || fds[1] < 0)
44 for (i = 0; i < NR_ITERS; i++) {
45 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
46 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
56 enum test_llvm__testcase prog_id;
59 const char *msg_compile_fail;
60 const char *msg_load_fail;
61 int (*target_func)(void);
64 } bpf_testcase_table[] = {
67 "Basic BPF filtering",
69 "fix 'perf test LLVM' first",
70 "load bpf object failed",
80 "check your vmlinux setting?",
85 #ifdef HAVE_BPF_PROLOGUE
87 LLVM_TESTCASE_BPF_PROLOGUE,
88 "BPF prologue generation",
89 "[bpf_prologue_test]",
91 "check your vmlinux setting?",
98 LLVM_TESTCASE_BPF_RELOCATION,
99 "BPF relocation checker",
100 "[bpf_relocation_test]",
101 "fix 'perf test LLVM' first",
102 "libbpf error when dealing with relocation",
109 static int do_test(struct bpf_object *obj, int (*func)(void),
112 struct record_opts opts = {
119 .default_interval = 1,
123 char sbuf[STRERR_BUFSIZE];
124 struct perf_evlist *evlist;
125 int i, ret = TEST_FAIL, err = 0, count = 0;
127 struct parse_events_evlist parse_evlist;
128 struct parse_events_error parse_error;
130 bzero(&parse_error, sizeof(parse_error));
131 bzero(&parse_evlist, sizeof(parse_evlist));
132 parse_evlist.error = &parse_error;
133 INIT_LIST_HEAD(&parse_evlist.list);
135 err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj, NULL);
136 if (err || list_empty(&parse_evlist.list)) {
137 pr_debug("Failed to add events selected by BPF\n");
141 snprintf(pid, sizeof(pid), "%d", getpid());
142 pid[sizeof(pid) - 1] = '\0';
143 opts.target.tid = opts.target.pid = pid;
145 /* Instead of perf_evlist__new_default, don't add default events */
146 evlist = perf_evlist__new();
148 pr_debug("Not enough memory to create evlist\n");
152 err = perf_evlist__create_maps(evlist, &opts.target);
154 pr_debug("Not enough memory to create thread/cpu maps\n");
155 goto out_delete_evlist;
158 perf_evlist__splice_list_tail(evlist, &parse_evlist.list);
159 evlist->nr_groups = parse_evlist.nr_groups;
161 perf_evlist__config(evlist, &opts, NULL);
163 err = perf_evlist__open(evlist);
165 pr_debug("perf_evlist__open: %s\n",
166 str_error_r(errno, sbuf, sizeof(sbuf)));
167 goto out_delete_evlist;
170 err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
172 pr_debug("perf_evlist__mmap: %s\n",
173 str_error_r(errno, sbuf, sizeof(sbuf)));
174 goto out_delete_evlist;
177 perf_evlist__enable(evlist);
179 perf_evlist__disable(evlist);
181 for (i = 0; i < evlist->nr_mmaps; i++) {
182 union perf_event *event;
184 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
185 const u32 type = event->header.type;
187 if (type == PERF_RECORD_SAMPLE)
192 if (count != expect) {
193 pr_debug("BPF filter result incorrect\n");
194 goto out_delete_evlist;
200 perf_evlist__delete(evlist);
204 static struct bpf_object *
205 prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
207 struct bpf_object *obj;
209 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
211 pr_debug("Compile BPF program failed.\n");
217 static int __test__bpf(int idx)
222 struct bpf_object *obj;
224 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
225 bpf_testcase_table[idx].prog_id,
227 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
228 pr_debug("Unable to get BPF object, %s\n",
229 bpf_testcase_table[idx].msg_compile_fail);
236 obj = prepare_bpf(obj_buf, obj_buf_sz,
237 bpf_testcase_table[idx].name);
238 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
240 pr_debug("Fail to load BPF object: %s\n",
241 bpf_testcase_table[idx].msg_load_fail);
243 pr_debug("Success unexpectedly: %s\n",
244 bpf_testcase_table[idx].msg_load_fail);
251 bpf_testcase_table[idx].target_func,
252 bpf_testcase_table[idx].expect_result);
255 if (bpf_testcase_table[idx].pin) {
258 if (!bpf_fs__mount()) {
259 pr_debug("BPF filesystem not mounted\n");
263 err = mkdir(PERF_TEST_BPF_PATH, 0777);
264 if (err && errno != EEXIST) {
265 pr_debug("Failed to make perf_test dir: %s\n",
270 if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
272 if (rm_rf(PERF_TEST_BPF_PATH))
282 int test__bpf_subtest_get_nr(void)
284 return (int)ARRAY_SIZE(bpf_testcase_table);
287 const char *test__bpf_subtest_get_desc(int i)
289 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
291 return bpf_testcase_table[i].desc;
294 static int check_env(void)
297 unsigned int kver_int;
298 char license[] = "GPL";
300 struct bpf_insn insns[] = {
301 BPF_MOV64_IMM(BPF_REG_0, 1),
305 err = fetch_kernel_version(&kver_int, NULL, 0);
307 pr_debug("Unable to get kernel version\n");
311 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
312 sizeof(insns) / sizeof(insns[0]),
313 license, kver_int, NULL, 0);
315 pr_err("Missing basic BPF support, skip this test: %s\n",
328 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
331 if (geteuid() != 0) {
332 pr_debug("Only root can run BPF test\n");
339 err = __test__bpf(i);
344 int test__bpf_subtest_get_nr(void)
349 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
354 int test__bpf(int i __maybe_unused)
356 pr_debug("Skip BPF test because BPF support is not compiled\n");