1 // SPDX-License-Identifier: GPL-2.0
8 #include <util/record.h>
10 #include <util/bpf-loader.h>
11 #include <util/evlist.h>
12 #include <linux/filter.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <api/fs/fs.h>
16 #include <perf/mmap.h>
20 #include "parse-events.h"
21 #include "util/mmap.h"
23 #define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
25 #ifdef HAVE_LIBBPF_SUPPORT
26 #include <linux/bpf.h>
29 static int epoll_pwait_loop(void)
33 /* Should fail NR_ITERS times */
34 for (i = 0; i < NR_ITERS; i++)
35 epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
39 #ifdef HAVE_BPF_PROLOGUE
41 static int llseek_loop(void)
45 fds[0] = open("/dev/null", O_RDONLY);
46 fds[1] = open("/dev/null", O_RDWR);
48 if (fds[0] < 0 || fds[1] < 0)
51 for (i = 0; i < NR_ITERS; i++) {
52 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
53 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
63 enum test_llvm__testcase prog_id;
66 const char *msg_compile_fail;
67 const char *msg_load_fail;
68 int (*target_func)(void);
71 } bpf_testcase_table[] = {
73 .prog_id = LLVM_TESTCASE_BASE,
74 .desc = "Basic BPF filtering",
75 .name = "[basic_bpf_test]",
76 .msg_compile_fail = "fix 'perf test LLVM' first",
77 .msg_load_fail = "load bpf object failed",
78 .target_func = &epoll_pwait_loop,
79 .expect_result = (NR_ITERS + 1) / 2,
82 .prog_id = LLVM_TESTCASE_BASE,
83 .desc = "BPF pinning",
84 .name = "[bpf_pinning]",
85 .msg_compile_fail = "fix kbuild first",
86 .msg_load_fail = "check your vmlinux setting?",
87 .target_func = &epoll_pwait_loop,
88 .expect_result = (NR_ITERS + 1) / 2,
91 #ifdef HAVE_BPF_PROLOGUE
93 .prog_id = LLVM_TESTCASE_BPF_PROLOGUE,
94 .desc = "BPF prologue generation",
95 .name = "[bpf_prologue_test]",
96 .msg_compile_fail = "fix kbuild first",
97 .msg_load_fail = "check your vmlinux setting?",
98 .target_func = &llseek_loop,
99 .expect_result = (NR_ITERS + 1) / 4,
104 static int do_test(struct bpf_object *obj, int (*func)(void),
107 struct record_opts opts = {
114 .default_interval = 1,
118 char sbuf[STRERR_BUFSIZE];
119 struct evlist *evlist;
120 int i, ret = TEST_FAIL, err = 0, count = 0;
122 struct parse_events_state parse_state;
123 struct parse_events_error parse_error;
125 bzero(&parse_error, sizeof(parse_error));
126 bzero(&parse_state, sizeof(parse_state));
127 parse_state.error = &parse_error;
128 INIT_LIST_HEAD(&parse_state.list);
130 err = parse_events_load_bpf_obj(&parse_state, &parse_state.list, obj, NULL);
131 if (err || list_empty(&parse_state.list)) {
132 pr_debug("Failed to add events selected by BPF\n");
136 snprintf(pid, sizeof(pid), "%d", getpid());
137 pid[sizeof(pid) - 1] = '\0';
138 opts.target.tid = opts.target.pid = pid;
140 /* Instead of evlist__new_default, don't add default events */
141 evlist = evlist__new();
143 pr_debug("Not enough memory to create evlist\n");
147 err = evlist__create_maps(evlist, &opts.target);
149 pr_debug("Not enough memory to create thread/cpu maps\n");
150 goto out_delete_evlist;
153 evlist__splice_list_tail(evlist, &parse_state.list);
154 evlist->nr_groups = parse_state.nr_groups;
156 evlist__config(evlist, &opts, NULL);
158 err = evlist__open(evlist);
160 pr_debug("perf_evlist__open: %s\n",
161 str_error_r(errno, sbuf, sizeof(sbuf)));
162 goto out_delete_evlist;
165 err = evlist__mmap(evlist, opts.mmap_pages);
167 pr_debug("evlist__mmap: %s\n",
168 str_error_r(errno, sbuf, sizeof(sbuf)));
169 goto out_delete_evlist;
172 evlist__enable(evlist);
174 evlist__disable(evlist);
176 for (i = 0; i < evlist->core.nr_mmaps; i++) {
177 union perf_event *event;
180 md = &evlist->mmap[i];
181 if (perf_mmap__read_init(&md->core) < 0)
184 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
185 const u32 type = event->header.type;
187 if (type == PERF_RECORD_SAMPLE)
190 perf_mmap__read_done(&md->core);
193 if (count != expect * evlist->core.nr_entries) {
194 pr_debug("BPF filter result incorrect, expected %d, got %d samples\n", expect, count);
195 goto out_delete_evlist;
201 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))
283 int test__bpf_subtest_get_nr(void)
285 return (int)ARRAY_SIZE(bpf_testcase_table);
288 const char *test__bpf_subtest_get_desc(int i)
290 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
292 return bpf_testcase_table[i].desc;
295 static int check_env(void)
298 unsigned int kver_int;
299 char license[] = "GPL";
301 struct bpf_insn insns[] = {
302 BPF_MOV64_IMM(BPF_REG_0, 1),
306 err = fetch_kernel_version(&kver_int, NULL, 0);
308 pr_debug("Unable to get kernel version\n");
312 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
313 sizeof(insns) / sizeof(insns[0]),
314 license, kver_int, NULL, 0);
316 pr_err("Missing basic BPF support, skip this test: %s\n",
325 int test__bpf(struct test *test __maybe_unused, int i)
329 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
332 if (geteuid() != 0) {
333 pr_debug("Only root can run BPF test\n");
340 err = __test__bpf(i);
345 int test__bpf_subtest_get_nr(void)
350 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
355 int test__bpf(struct test *test __maybe_unused, int i __maybe_unused)
357 pr_debug("Skip BPF test because BPF support is not compiled\n");