1 // SPDX-License-Identifier: GPL-2.0
9 #include <util/bpf-loader.h>
10 #include <util/evlist.h>
11 #include <linux/bpf.h>
12 #include <linux/filter.h>
13 #include <linux/kernel.h>
14 #include <api/fs/fs.h>
20 #define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
22 #ifdef HAVE_LIBBPF_SUPPORT
24 static int epoll_pwait_loop(void)
28 /* Should fail NR_ITERS times */
29 for (i = 0; i < NR_ITERS; i++)
30 epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
34 #ifdef HAVE_BPF_PROLOGUE
36 static int llseek_loop(void)
40 fds[0] = open("/dev/null", O_RDONLY);
41 fds[1] = open("/dev/null", O_RDWR);
43 if (fds[0] < 0 || fds[1] < 0)
46 for (i = 0; i < NR_ITERS; i++) {
47 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
48 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
58 enum test_llvm__testcase prog_id;
61 const char *msg_compile_fail;
62 const char *msg_load_fail;
63 int (*target_func)(void);
66 } bpf_testcase_table[] = {
68 .prog_id = LLVM_TESTCASE_BASE,
69 .desc = "Basic BPF filtering",
70 .name = "[basic_bpf_test]",
71 .msg_compile_fail = "fix 'perf test LLVM' first",
72 .msg_load_fail = "load bpf object failed",
73 .target_func = &epoll_pwait_loop,
74 .expect_result = (NR_ITERS + 1) / 2,
77 .prog_id = LLVM_TESTCASE_BASE,
78 .desc = "BPF pinning",
79 .name = "[bpf_pinning]",
80 .msg_compile_fail = "fix kbuild first",
81 .msg_load_fail = "check your vmlinux setting?",
82 .target_func = &epoll_pwait_loop,
83 .expect_result = (NR_ITERS + 1) / 2,
86 #ifdef HAVE_BPF_PROLOGUE
88 .prog_id = LLVM_TESTCASE_BPF_PROLOGUE,
89 .desc = "BPF prologue generation",
90 .name = "[bpf_prologue_test]",
91 .msg_compile_fail = "fix kbuild first",
92 .msg_load_fail = "check your vmlinux setting?",
93 .target_func = &llseek_loop,
94 .expect_result = (NR_ITERS + 1) / 4,
98 .prog_id = LLVM_TESTCASE_BPF_RELOCATION,
99 .desc = "BPF relocation checker",
100 .name = "[bpf_relocation_test]",
101 .msg_compile_fail = "fix 'perf test LLVM' first",
102 .msg_load_fail = "libbpf error when dealing with relocation",
106 static int do_test(struct bpf_object *obj, int (*func)(void),
109 struct record_opts opts = {
116 .default_interval = 1,
120 char sbuf[STRERR_BUFSIZE];
121 struct perf_evlist *evlist;
122 int i, ret = TEST_FAIL, err = 0, count = 0;
124 struct parse_events_state parse_state;
125 struct parse_events_error parse_error;
127 bzero(&parse_error, sizeof(parse_error));
128 bzero(&parse_state, sizeof(parse_state));
129 parse_state.error = &parse_error;
130 INIT_LIST_HEAD(&parse_state.list);
132 err = parse_events_load_bpf_obj(&parse_state, &parse_state.list, obj, NULL);
133 if (err || list_empty(&parse_state.list)) {
134 pr_debug("Failed to add events selected by BPF\n");
138 snprintf(pid, sizeof(pid), "%d", getpid());
139 pid[sizeof(pid) - 1] = '\0';
140 opts.target.tid = opts.target.pid = pid;
142 /* Instead of perf_evlist__new_default, don't add default events */
143 evlist = perf_evlist__new();
145 pr_debug("Not enough memory to create evlist\n");
149 err = perf_evlist__create_maps(evlist, &opts.target);
151 pr_debug("Not enough memory to create thread/cpu maps\n");
152 goto out_delete_evlist;
155 perf_evlist__splice_list_tail(evlist, &parse_state.list);
156 evlist->nr_groups = parse_state.nr_groups;
158 perf_evlist__config(evlist, &opts, NULL);
160 err = perf_evlist__open(evlist);
162 pr_debug("perf_evlist__open: %s\n",
163 str_error_r(errno, sbuf, sizeof(sbuf)));
164 goto out_delete_evlist;
167 err = perf_evlist__mmap(evlist, opts.mmap_pages);
169 pr_debug("perf_evlist__mmap: %s\n",
170 str_error_r(errno, sbuf, sizeof(sbuf)));
171 goto out_delete_evlist;
174 perf_evlist__enable(evlist);
176 perf_evlist__disable(evlist);
178 for (i = 0; i < evlist->nr_mmaps; i++) {
179 union perf_event *event;
180 struct perf_mmap *md;
182 md = &evlist->mmap[i];
183 if (perf_mmap__read_init(md) < 0)
186 while ((event = perf_mmap__read_event(md)) != NULL) {
187 const u32 type = event->header.type;
189 if (type == PERF_RECORD_SAMPLE)
192 perf_mmap__read_done(md);
195 if (count != expect) {
196 pr_debug("BPF filter result incorrect, expected %d, got %d samples\n", expect, count);
197 goto out_delete_evlist;
203 perf_evlist__delete(evlist);
207 static struct bpf_object *
208 prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
210 struct bpf_object *obj;
212 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
214 pr_debug("Compile BPF program failed.\n");
220 static int __test__bpf(int idx)
225 struct bpf_object *obj;
227 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
228 bpf_testcase_table[idx].prog_id,
230 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
231 pr_debug("Unable to get BPF object, %s\n",
232 bpf_testcase_table[idx].msg_compile_fail);
239 obj = prepare_bpf(obj_buf, obj_buf_sz,
240 bpf_testcase_table[idx].name);
241 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
243 pr_debug("Fail to load BPF object: %s\n",
244 bpf_testcase_table[idx].msg_load_fail);
246 pr_debug("Success unexpectedly: %s\n",
247 bpf_testcase_table[idx].msg_load_fail);
254 bpf_testcase_table[idx].target_func,
255 bpf_testcase_table[idx].expect_result);
258 if (bpf_testcase_table[idx].pin) {
261 if (!bpf_fs__mount()) {
262 pr_debug("BPF filesystem not mounted\n");
266 err = mkdir(PERF_TEST_BPF_PATH, 0777);
267 if (err && errno != EEXIST) {
268 pr_debug("Failed to make perf_test dir: %s\n",
273 if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
275 if (rm_rf(PERF_TEST_BPF_PATH))
285 int test__bpf_subtest_get_nr(void)
287 return (int)ARRAY_SIZE(bpf_testcase_table);
290 const char *test__bpf_subtest_get_desc(int i)
292 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
294 return bpf_testcase_table[i].desc;
297 static int check_env(void)
300 unsigned int kver_int;
301 char license[] = "GPL";
303 struct bpf_insn insns[] = {
304 BPF_MOV64_IMM(BPF_REG_0, 1),
308 err = fetch_kernel_version(&kver_int, NULL, 0);
310 pr_debug("Unable to get kernel version\n");
314 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
315 sizeof(insns) / sizeof(insns[0]),
316 license, kver_int, NULL, 0);
318 pr_err("Missing basic BPF support, skip this test: %s\n",
327 int test__bpf(struct test *test __maybe_unused, int i)
331 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
334 if (geteuid() != 0) {
335 pr_debug("Only root can run BPF test\n");
342 err = __test__bpf(i);
347 int test__bpf_subtest_get_nr(void)
352 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
357 int test__bpf(struct test *test __maybe_unused, int i __maybe_unused)
359 pr_debug("Skip BPF test because BPF support is not compiled\n");