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1 #include <errno.h>
2 #include <stdio.h>
3 #include <sys/epoll.h>
4 #include <sys/types.h>
5 #include <sys/stat.h>
6 #include <fcntl.h>
7 #include <util/util.h>
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>
14 #include <bpf/bpf.h>
15 #include "tests.h"
16 #include "llvm.h"
17 #include "debug.h"
18 #define NR_ITERS       111
19 #define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
20
21 #ifdef HAVE_LIBBPF_SUPPORT
22
23 static int epoll_pwait_loop(void)
24 {
25         int i;
26
27         /* Should fail NR_ITERS times */
28         for (i = 0; i < NR_ITERS; i++)
29                 epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
30         return 0;
31 }
32
33 #ifdef HAVE_BPF_PROLOGUE
34
35 static int llseek_loop(void)
36 {
37         int fds[2], i;
38
39         fds[0] = open("/dev/null", O_RDONLY);
40         fds[1] = open("/dev/null", O_RDWR);
41
42         if (fds[0] < 0 || fds[1] < 0)
43                 return -1;
44
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);
48         }
49         close(fds[0]);
50         close(fds[1]);
51         return 0;
52 }
53
54 #endif
55
56 static struct {
57         enum test_llvm__testcase prog_id;
58         const char *desc;
59         const char *name;
60         const char *msg_compile_fail;
61         const char *msg_load_fail;
62         int (*target_func)(void);
63         int expect_result;
64         bool    pin;
65 } bpf_testcase_table[] = {
66         {
67                 .prog_id          = LLVM_TESTCASE_BASE,
68                 .desc             = "Basic BPF filtering",
69                 .name             = "[basic_bpf_test]",
70                 .msg_compile_fail = "fix 'perf test LLVM' first",
71                 .msg_load_fail    = "load bpf object failed",
72                 .target_func      = &epoll_pwait_loop,
73                 .expect_result    = (NR_ITERS + 1) / 2,
74         },
75         {
76                 .prog_id          = LLVM_TESTCASE_BASE,
77                 .desc             = "BPF pinning",
78                 .name             = "[bpf_pinning]",
79                 .msg_compile_fail = "fix kbuild first",
80                 .msg_load_fail    = "check your vmlinux setting?",
81                 .target_func      = &epoll_pwait_loop,
82                 .expect_result    = (NR_ITERS + 1) / 2,
83                 .pin              = true,
84         },
85 #ifdef HAVE_BPF_PROLOGUE
86         {
87                 .prog_id          = LLVM_TESTCASE_BPF_PROLOGUE,
88                 .desc             = "BPF prologue generation",
89                 .name             = "[bpf_prologue_test]",
90                 .msg_compile_fail = "fix kbuild first",
91                 .msg_load_fail    = "check your vmlinux setting?",
92                 .target_func      = &llseek_loop,
93                 .expect_result    = (NR_ITERS + 1) / 4,
94         },
95 #endif
96         {
97                 .prog_id          = LLVM_TESTCASE_BPF_RELOCATION,
98                 .desc             = "BPF relocation checker",
99                 .name             = "[bpf_relocation_test]",
100                 .msg_compile_fail = "fix 'perf test LLVM' first",
101                 .msg_load_fail    = "libbpf error when dealing with relocation",
102         },
103 };
104
105 static int do_test(struct bpf_object *obj, int (*func)(void),
106                    int expect)
107 {
108         struct record_opts opts = {
109                 .target = {
110                         .uid = UINT_MAX,
111                         .uses_mmap = true,
112                 },
113                 .freq         = 0,
114                 .mmap_pages   = 256,
115                 .default_interval = 1,
116         };
117
118         char pid[16];
119         char sbuf[STRERR_BUFSIZE];
120         struct perf_evlist *evlist;
121         int i, ret = TEST_FAIL, err = 0, count = 0;
122
123         struct parse_events_state parse_state;
124         struct parse_events_error parse_error;
125
126         bzero(&parse_error, sizeof(parse_error));
127         bzero(&parse_state, sizeof(parse_state));
128         parse_state.error = &parse_error;
129         INIT_LIST_HEAD(&parse_state.list);
130
131         err = parse_events_load_bpf_obj(&parse_state, &parse_state.list, obj, NULL);
132         if (err || list_empty(&parse_state.list)) {
133                 pr_debug("Failed to add events selected by BPF\n");
134                 return TEST_FAIL;
135         }
136
137         snprintf(pid, sizeof(pid), "%d", getpid());
138         pid[sizeof(pid) - 1] = '\0';
139         opts.target.tid = opts.target.pid = pid;
140
141         /* Instead of perf_evlist__new_default, don't add default events */
142         evlist = perf_evlist__new();
143         if (!evlist) {
144                 pr_debug("Not enough memory to create evlist\n");
145                 return TEST_FAIL;
146         }
147
148         err = perf_evlist__create_maps(evlist, &opts.target);
149         if (err < 0) {
150                 pr_debug("Not enough memory to create thread/cpu maps\n");
151                 goto out_delete_evlist;
152         }
153
154         perf_evlist__splice_list_tail(evlist, &parse_state.list);
155         evlist->nr_groups = parse_state.nr_groups;
156
157         perf_evlist__config(evlist, &opts, NULL);
158
159         err = perf_evlist__open(evlist);
160         if (err < 0) {
161                 pr_debug("perf_evlist__open: %s\n",
162                          str_error_r(errno, sbuf, sizeof(sbuf)));
163                 goto out_delete_evlist;
164         }
165
166         err = perf_evlist__mmap(evlist, opts.mmap_pages);
167         if (err < 0) {
168                 pr_debug("perf_evlist__mmap: %s\n",
169                          str_error_r(errno, sbuf, sizeof(sbuf)));
170                 goto out_delete_evlist;
171         }
172
173         perf_evlist__enable(evlist);
174         (*func)();
175         perf_evlist__disable(evlist);
176
177         for (i = 0; i < evlist->nr_mmaps; i++) {
178                 union perf_event *event;
179                 struct perf_mmap *md;
180
181                 md = &evlist->mmap[i];
182                 if (perf_mmap__read_init(md) < 0)
183                         continue;
184
185                 while ((event = perf_mmap__read_event(md)) != NULL) {
186                         const u32 type = event->header.type;
187
188                         if (type == PERF_RECORD_SAMPLE)
189                                 count ++;
190                 }
191                 perf_mmap__read_done(md);
192         }
193
194         if (count != expect) {
195                 pr_debug("BPF filter result incorrect, expected %d, got %d samples\n", expect, count);
196                 goto out_delete_evlist;
197         }
198
199         ret = TEST_OK;
200
201 out_delete_evlist:
202         perf_evlist__delete(evlist);
203         return ret;
204 }
205
206 static struct bpf_object *
207 prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
208 {
209         struct bpf_object *obj;
210
211         obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
212         if (IS_ERR(obj)) {
213                 pr_debug("Compile BPF program failed.\n");
214                 return NULL;
215         }
216         return obj;
217 }
218
219 static int __test__bpf(int idx)
220 {
221         int ret;
222         void *obj_buf;
223         size_t obj_buf_sz;
224         struct bpf_object *obj;
225
226         ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
227                                        bpf_testcase_table[idx].prog_id,
228                                        true, NULL);
229         if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
230                 pr_debug("Unable to get BPF object, %s\n",
231                          bpf_testcase_table[idx].msg_compile_fail);
232                 if (idx == 0)
233                         return TEST_SKIP;
234                 else
235                         return TEST_FAIL;
236         }
237
238         obj = prepare_bpf(obj_buf, obj_buf_sz,
239                           bpf_testcase_table[idx].name);
240         if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
241                 if (!obj)
242                         pr_debug("Fail to load BPF object: %s\n",
243                                  bpf_testcase_table[idx].msg_load_fail);
244                 else
245                         pr_debug("Success unexpectedly: %s\n",
246                                  bpf_testcase_table[idx].msg_load_fail);
247                 ret = TEST_FAIL;
248                 goto out;
249         }
250
251         if (obj) {
252                 ret = do_test(obj,
253                               bpf_testcase_table[idx].target_func,
254                               bpf_testcase_table[idx].expect_result);
255                 if (ret != TEST_OK)
256                         goto out;
257                 if (bpf_testcase_table[idx].pin) {
258                         int err;
259
260                         if (!bpf_fs__mount()) {
261                                 pr_debug("BPF filesystem not mounted\n");
262                                 ret = TEST_FAIL;
263                                 goto out;
264                         }
265                         err = mkdir(PERF_TEST_BPF_PATH, 0777);
266                         if (err && errno != EEXIST) {
267                                 pr_debug("Failed to make perf_test dir: %s\n",
268                                          strerror(errno));
269                                 ret = TEST_FAIL;
270                                 goto out;
271                         }
272                         if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
273                                 ret = TEST_FAIL;
274                         if (rm_rf(PERF_TEST_BPF_PATH))
275                                 ret = TEST_FAIL;
276                 }
277         }
278
279 out:
280         bpf__clear();
281         return ret;
282 }
283
284 int test__bpf_subtest_get_nr(void)
285 {
286         return (int)ARRAY_SIZE(bpf_testcase_table);
287 }
288
289 const char *test__bpf_subtest_get_desc(int i)
290 {
291         if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
292                 return NULL;
293         return bpf_testcase_table[i].desc;
294 }
295
296 static int check_env(void)
297 {
298         int err;
299         unsigned int kver_int;
300         char license[] = "GPL";
301
302         struct bpf_insn insns[] = {
303                 BPF_MOV64_IMM(BPF_REG_0, 1),
304                 BPF_EXIT_INSN(),
305         };
306
307         err = fetch_kernel_version(&kver_int, NULL, 0);
308         if (err) {
309                 pr_debug("Unable to get kernel version\n");
310                 return err;
311         }
312
313         err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
314                                sizeof(insns) / sizeof(insns[0]),
315                                license, kver_int, NULL, 0);
316         if (err < 0) {
317                 pr_err("Missing basic BPF support, skip this test: %s\n",
318                        strerror(errno));
319                 return err;
320         }
321         close(err);
322
323         return 0;
324 }
325
326 int test__bpf(struct test *test __maybe_unused, int i)
327 {
328         int err;
329
330         if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
331                 return TEST_FAIL;
332
333         if (geteuid() != 0) {
334                 pr_debug("Only root can run BPF test\n");
335                 return TEST_SKIP;
336         }
337
338         if (check_env())
339                 return TEST_SKIP;
340
341         err = __test__bpf(i);
342         return err;
343 }
344
345 #else
346 int test__bpf_subtest_get_nr(void)
347 {
348         return 0;
349 }
350
351 const char *test__bpf_subtest_get_desc(int i __maybe_unused)
352 {
353         return NULL;
354 }
355
356 int test__bpf(struct test *test __maybe_unused, int i __maybe_unused)
357 {
358         pr_debug("Skip BPF test because BPF support is not compiled\n");
359         return TEST_SKIP;
360 }
361 #endif
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