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1// SPDX-License-Identifier: GPL-2.0
2#include <errno.h>
3#include <stdio.h>
4#include <sys/epoll.h>
5#include <sys/types.h>
6#include <sys/stat.h>
7#include <fcntl.h>
8#include <util/record.h>
9#include <util/util.h>
10#include <util/bpf-loader.h>
11#include <util/evlist.h>
12#include <linux/bpf.h>
13#include <linux/filter.h>
14#include <linux/kernel.h>
15#include <linux/string.h>
16#include <api/fs/fs.h>
17#include <bpf/bpf.h>
18#include "tests.h"
19#include "llvm.h"
20#include "debug.h"
21#include "parse-events.h"
22#include "util/mmap.h"
23#define NR_ITERS 111
24#define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
25
26#ifdef HAVE_LIBBPF_SUPPORT
27
28static int epoll_pwait_loop(void)
29{
30 int i;
31
32 /* Should fail NR_ITERS times */
33 for (i = 0; i < NR_ITERS; i++)
34 epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
35 return 0;
36}
37
38#ifdef HAVE_BPF_PROLOGUE
39
40static int llseek_loop(void)
41{
42 int fds[2], i;
43
44 fds[0] = open("/dev/null", O_RDONLY);
45 fds[1] = open("/dev/null", O_RDWR);
46
47 if (fds[0] < 0 || fds[1] < 0)
48 return -1;
49
50 for (i = 0; i < NR_ITERS; i++) {
51 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
52 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
53 }
54 close(fds[0]);
55 close(fds[1]);
56 return 0;
57}
58
59#endif
60
61static struct {
62 enum test_llvm__testcase prog_id;
63 const char *desc;
64 const char *name;
65 const char *msg_compile_fail;
66 const char *msg_load_fail;
67 int (*target_func)(void);
68 int expect_result;
69 bool pin;
70} bpf_testcase_table[] = {
71 {
72 .prog_id = LLVM_TESTCASE_BASE,
73 .desc = "Basic BPF filtering",
74 .name = "[basic_bpf_test]",
75 .msg_compile_fail = "fix 'perf test LLVM' first",
76 .msg_load_fail = "load bpf object failed",
77 .target_func = &epoll_pwait_loop,
78 .expect_result = (NR_ITERS + 1) / 2,
79 },
80 {
81 .prog_id = LLVM_TESTCASE_BASE,
82 .desc = "BPF pinning",
83 .name = "[bpf_pinning]",
84 .msg_compile_fail = "fix kbuild first",
85 .msg_load_fail = "check your vmlinux setting?",
86 .target_func = &epoll_pwait_loop,
87 .expect_result = (NR_ITERS + 1) / 2,
88 .pin = true,
89 },
90#ifdef HAVE_BPF_PROLOGUE
91 {
92 .prog_id = LLVM_TESTCASE_BPF_PROLOGUE,
93 .desc = "BPF prologue generation",
94 .name = "[bpf_prologue_test]",
95 .msg_compile_fail = "fix kbuild first",
96 .msg_load_fail = "check your vmlinux setting?",
97 .target_func = &llseek_loop,
98 .expect_result = (NR_ITERS + 1) / 4,
99 },
100#endif
101 {
102 .prog_id = LLVM_TESTCASE_BPF_RELOCATION,
103 .desc = "BPF relocation checker",
104 .name = "[bpf_relocation_test]",
105 .msg_compile_fail = "fix 'perf test LLVM' first",
106 .msg_load_fail = "libbpf error when dealing with relocation",
107 },
108};
109
110static int do_test(struct bpf_object *obj, int (*func)(void),
111 int expect)
112{
113 struct record_opts opts = {
114 .target = {
115 .uid = UINT_MAX,
116 .uses_mmap = true,
117 },
118 .freq = 0,
119 .mmap_pages = 256,
120 .default_interval = 1,
121 };
122
123 char pid[16];
124 char sbuf[STRERR_BUFSIZE];
125 struct evlist *evlist;
126 int i, ret = TEST_FAIL, err = 0, count = 0;
127
128 struct parse_events_state parse_state;
129 struct parse_events_error parse_error;
130
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);
135
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");
139 return TEST_FAIL;
140 }
141
142 snprintf(pid, sizeof(pid), "%d", getpid());
143 pid[sizeof(pid) - 1] = '\0';
144 opts.target.tid = opts.target.pid = pid;
145
146 /* Instead of perf_evlist__new_default, don't add default events */
147 evlist = evlist__new();
148 if (!evlist) {
149 pr_debug("Not enough memory to create evlist\n");
150 return TEST_FAIL;
151 }
152
153 err = perf_evlist__create_maps(evlist, &opts.target);
154 if (err < 0) {
155 pr_debug("Not enough memory to create thread/cpu maps\n");
156 goto out_delete_evlist;
157 }
158
159 perf_evlist__splice_list_tail(evlist, &parse_state.list);
160 evlist->nr_groups = parse_state.nr_groups;
161
162 perf_evlist__config(evlist, &opts, NULL);
163
164 err = evlist__open(evlist);
165 if (err < 0) {
166 pr_debug("perf_evlist__open: %s\n",
167 str_error_r(errno, sbuf, sizeof(sbuf)));
168 goto out_delete_evlist;
169 }
170
171 err = evlist__mmap(evlist, opts.mmap_pages);
172 if (err < 0) {
173 pr_debug("evlist__mmap: %s\n",
174 str_error_r(errno, sbuf, sizeof(sbuf)));
175 goto out_delete_evlist;
176 }
177
178 evlist__enable(evlist);
179 (*func)();
180 evlist__disable(evlist);
181
182 for (i = 0; i < evlist->core.nr_mmaps; i++) {
183 union perf_event *event;
184 struct mmap *md;
185
186 md = &evlist->mmap[i];
187 if (perf_mmap__read_init(md) < 0)
188 continue;
189
190 while ((event = perf_mmap__read_event(md)) != NULL) {
191 const u32 type = event->header.type;
192
193 if (type == PERF_RECORD_SAMPLE)
194 count ++;
195 }
196 perf_mmap__read_done(md);
197 }
198
199 if (count != expect) {
200 pr_debug("BPF filter result incorrect, expected %d, got %d samples\n", expect, count);
201 goto out_delete_evlist;
202 }
203
204 ret = TEST_OK;
205
206out_delete_evlist:
207 evlist__delete(evlist);
208 return ret;
209}
210
211static struct bpf_object *
212prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
213{
214 struct bpf_object *obj;
215
216 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
217 if (IS_ERR(obj)) {
218 pr_debug("Compile BPF program failed.\n");
219 return NULL;
220 }
221 return obj;
222}
223
224static int __test__bpf(int idx)
225{
226 int ret;
227 void *obj_buf;
228 size_t obj_buf_sz;
229 struct bpf_object *obj;
230
231 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
232 bpf_testcase_table[idx].prog_id,
233 true, NULL);
234 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
235 pr_debug("Unable to get BPF object, %s\n",
236 bpf_testcase_table[idx].msg_compile_fail);
237 if (idx == 0)
238 return TEST_SKIP;
239 else
240 return TEST_FAIL;
241 }
242
243 obj = prepare_bpf(obj_buf, obj_buf_sz,
244 bpf_testcase_table[idx].name);
245 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
246 if (!obj)
247 pr_debug("Fail to load BPF object: %s\n",
248 bpf_testcase_table[idx].msg_load_fail);
249 else
250 pr_debug("Success unexpectedly: %s\n",
251 bpf_testcase_table[idx].msg_load_fail);
252 ret = TEST_FAIL;
253 goto out;
254 }
255
256 if (obj) {
257 ret = do_test(obj,
258 bpf_testcase_table[idx].target_func,
259 bpf_testcase_table[idx].expect_result);
260 if (ret != TEST_OK)
261 goto out;
262 if (bpf_testcase_table[idx].pin) {
263 int err;
264
265 if (!bpf_fs__mount()) {
266 pr_debug("BPF filesystem not mounted\n");
267 ret = TEST_FAIL;
268 goto out;
269 }
270 err = mkdir(PERF_TEST_BPF_PATH, 0777);
271 if (err && errno != EEXIST) {
272 pr_debug("Failed to make perf_test dir: %s\n",
273 strerror(errno));
274 ret = TEST_FAIL;
275 goto out;
276 }
277 if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
278 ret = TEST_FAIL;
279 if (rm_rf(PERF_TEST_BPF_PATH))
280 ret = TEST_FAIL;
281 }
282 }
283
284out:
285 bpf__clear();
286 return ret;
287}
288
289int test__bpf_subtest_get_nr(void)
290{
291 return (int)ARRAY_SIZE(bpf_testcase_table);
292}
293
294const char *test__bpf_subtest_get_desc(int i)
295{
296 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
297 return NULL;
298 return bpf_testcase_table[i].desc;
299}
300
301static int check_env(void)
302{
303 int err;
304 unsigned int kver_int;
305 char license[] = "GPL";
306
307 struct bpf_insn insns[] = {
308 BPF_MOV64_IMM(BPF_REG_0, 1),
309 BPF_EXIT_INSN(),
310 };
311
312 err = fetch_kernel_version(&kver_int, NULL, 0);
313 if (err) {
314 pr_debug("Unable to get kernel version\n");
315 return err;
316 }
317
318 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
319 sizeof(insns) / sizeof(insns[0]),
320 license, kver_int, NULL, 0);
321 if (err < 0) {
322 pr_err("Missing basic BPF support, skip this test: %s\n",
323 strerror(errno));
324 return err;
325 }
326 close(err);
327
328 return 0;
329}
330
331int test__bpf(struct test *test __maybe_unused, int i)
332{
333 int err;
334
335 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
336 return TEST_FAIL;
337
338 if (geteuid() != 0) {
339 pr_debug("Only root can run BPF test\n");
340 return TEST_SKIP;
341 }
342
343 if (check_env())
344 return TEST_SKIP;
345
346 err = __test__bpf(i);
347 return err;
348}
349
350#else
351int test__bpf_subtest_get_nr(void)
352{
353 return 0;
354}
355
356const char *test__bpf_subtest_get_desc(int i __maybe_unused)
357{
358 return NULL;
359}
360
361int test__bpf(struct test *test __maybe_unused, int i __maybe_unused)
362{
363 pr_debug("Skip BPF test because BPF support is not compiled\n");
364 return TEST_SKIP;
365}
366#endif