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Linux/tools/perf/tests/bpf.c

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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
362 

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