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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
60a11774 SR |
2 | /* Include in trace.c */ |
3 | ||
ae7e81c0 | 4 | #include <uapi/linux/sched/types.h> |
9cc26a26 | 5 | #include <linux/stringify.h> |
60a11774 | 6 | #include <linux/kthread.h> |
c7aafc54 | 7 | #include <linux/delay.h> |
5a0e3ad6 | 8 | #include <linux/slab.h> |
60a11774 | 9 | |
e309b41d | 10 | static inline int trace_valid_entry(struct trace_entry *entry) |
60a11774 SR |
11 | { |
12 | switch (entry->type) { | |
13 | case TRACE_FN: | |
14 | case TRACE_CTX: | |
57422797 | 15 | case TRACE_WAKE: |
06fa75ab | 16 | case TRACE_STACK: |
dd0e545f | 17 | case TRACE_PRINT: |
80e5ea45 | 18 | case TRACE_BRANCH: |
7447dce9 FW |
19 | case TRACE_GRAPH_ENT: |
20 | case TRACE_GRAPH_RET: | |
60a11774 SR |
21 | return 1; |
22 | } | |
23 | return 0; | |
24 | } | |
25 | ||
12883efb | 26 | static int trace_test_buffer_cpu(struct trace_buffer *buf, int cpu) |
60a11774 | 27 | { |
3928a8a2 SR |
28 | struct ring_buffer_event *event; |
29 | struct trace_entry *entry; | |
4b3e3d22 | 30 | unsigned int loops = 0; |
60a11774 | 31 | |
12883efb | 32 | while ((event = ring_buffer_consume(buf->buffer, cpu, NULL, NULL))) { |
3928a8a2 | 33 | entry = ring_buffer_event_data(event); |
60a11774 | 34 | |
4b3e3d22 SR |
35 | /* |
36 | * The ring buffer is a size of trace_buf_size, if | |
37 | * we loop more than the size, there's something wrong | |
38 | * with the ring buffer. | |
39 | */ | |
40 | if (loops++ > trace_buf_size) { | |
41 | printk(KERN_CONT ".. bad ring buffer "); | |
42 | goto failed; | |
43 | } | |
3928a8a2 | 44 | if (!trace_valid_entry(entry)) { |
c7aafc54 | 45 | printk(KERN_CONT ".. invalid entry %d ", |
3928a8a2 | 46 | entry->type); |
60a11774 SR |
47 | goto failed; |
48 | } | |
60a11774 | 49 | } |
60a11774 SR |
50 | return 0; |
51 | ||
52 | failed: | |
08bafa0e SR |
53 | /* disable tracing */ |
54 | tracing_disabled = 1; | |
60a11774 SR |
55 | printk(KERN_CONT ".. corrupted trace buffer .. "); |
56 | return -1; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Test the trace buffer to see if all the elements | |
61 | * are still sane. | |
62 | */ | |
c3b5b6ed | 63 | static int __maybe_unused trace_test_buffer(struct trace_buffer *buf, unsigned long *count) |
60a11774 | 64 | { |
30afdcb1 SR |
65 | unsigned long flags, cnt = 0; |
66 | int cpu, ret = 0; | |
60a11774 | 67 | |
30afdcb1 | 68 | /* Don't allow flipping of max traces now */ |
d51ad7ac | 69 | local_irq_save(flags); |
0b9b12c1 | 70 | arch_spin_lock(&buf->tr->max_lock); |
60a11774 | 71 | |
12883efb | 72 | cnt = ring_buffer_entries(buf->buffer); |
60a11774 | 73 | |
0c5119c1 SR |
74 | /* |
75 | * The trace_test_buffer_cpu runs a while loop to consume all data. | |
76 | * If the calling tracer is broken, and is constantly filling | |
77 | * the buffer, this will run forever, and hard lock the box. | |
78 | * We disable the ring buffer while we do this test to prevent | |
79 | * a hard lock up. | |
80 | */ | |
81 | tracing_off(); | |
3928a8a2 | 82 | for_each_possible_cpu(cpu) { |
12883efb | 83 | ret = trace_test_buffer_cpu(buf, cpu); |
60a11774 SR |
84 | if (ret) |
85 | break; | |
86 | } | |
0c5119c1 | 87 | tracing_on(); |
0b9b12c1 | 88 | arch_spin_unlock(&buf->tr->max_lock); |
d51ad7ac | 89 | local_irq_restore(flags); |
60a11774 SR |
90 | |
91 | if (count) | |
92 | *count = cnt; | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
1c80025a FW |
97 | static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret) |
98 | { | |
99 | printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n", | |
100 | trace->name, init_ret); | |
101 | } | |
606576ce | 102 | #ifdef CONFIG_FUNCTION_TRACER |
77a2b37d SR |
103 | |
104 | #ifdef CONFIG_DYNAMIC_FTRACE | |
105 | ||
95950c2e SR |
106 | static int trace_selftest_test_probe1_cnt; |
107 | static void trace_selftest_test_probe1_func(unsigned long ip, | |
2f5f6ad9 | 108 | unsigned long pip, |
a1e2e31d SR |
109 | struct ftrace_ops *op, |
110 | struct pt_regs *pt_regs) | |
95950c2e SR |
111 | { |
112 | trace_selftest_test_probe1_cnt++; | |
113 | } | |
114 | ||
115 | static int trace_selftest_test_probe2_cnt; | |
116 | static void trace_selftest_test_probe2_func(unsigned long ip, | |
2f5f6ad9 | 117 | unsigned long pip, |
a1e2e31d SR |
118 | struct ftrace_ops *op, |
119 | struct pt_regs *pt_regs) | |
95950c2e SR |
120 | { |
121 | trace_selftest_test_probe2_cnt++; | |
122 | } | |
123 | ||
124 | static int trace_selftest_test_probe3_cnt; | |
125 | static void trace_selftest_test_probe3_func(unsigned long ip, | |
2f5f6ad9 | 126 | unsigned long pip, |
a1e2e31d SR |
127 | struct ftrace_ops *op, |
128 | struct pt_regs *pt_regs) | |
95950c2e SR |
129 | { |
130 | trace_selftest_test_probe3_cnt++; | |
131 | } | |
132 | ||
133 | static int trace_selftest_test_global_cnt; | |
134 | static void trace_selftest_test_global_func(unsigned long ip, | |
2f5f6ad9 | 135 | unsigned long pip, |
a1e2e31d SR |
136 | struct ftrace_ops *op, |
137 | struct pt_regs *pt_regs) | |
95950c2e SR |
138 | { |
139 | trace_selftest_test_global_cnt++; | |
140 | } | |
141 | ||
142 | static int trace_selftest_test_dyn_cnt; | |
143 | static void trace_selftest_test_dyn_func(unsigned long ip, | |
2f5f6ad9 | 144 | unsigned long pip, |
a1e2e31d SR |
145 | struct ftrace_ops *op, |
146 | struct pt_regs *pt_regs) | |
95950c2e SR |
147 | { |
148 | trace_selftest_test_dyn_cnt++; | |
149 | } | |
150 | ||
151 | static struct ftrace_ops test_probe1 = { | |
152 | .func = trace_selftest_test_probe1_func, | |
4740974a | 153 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
95950c2e SR |
154 | }; |
155 | ||
156 | static struct ftrace_ops test_probe2 = { | |
157 | .func = trace_selftest_test_probe2_func, | |
4740974a | 158 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
95950c2e SR |
159 | }; |
160 | ||
161 | static struct ftrace_ops test_probe3 = { | |
162 | .func = trace_selftest_test_probe3_func, | |
4740974a | 163 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
95950c2e SR |
164 | }; |
165 | ||
95950c2e SR |
166 | static void print_counts(void) |
167 | { | |
168 | printk("(%d %d %d %d %d) ", | |
169 | trace_selftest_test_probe1_cnt, | |
170 | trace_selftest_test_probe2_cnt, | |
171 | trace_selftest_test_probe3_cnt, | |
172 | trace_selftest_test_global_cnt, | |
173 | trace_selftest_test_dyn_cnt); | |
174 | } | |
175 | ||
176 | static void reset_counts(void) | |
177 | { | |
178 | trace_selftest_test_probe1_cnt = 0; | |
179 | trace_selftest_test_probe2_cnt = 0; | |
180 | trace_selftest_test_probe3_cnt = 0; | |
181 | trace_selftest_test_global_cnt = 0; | |
182 | trace_selftest_test_dyn_cnt = 0; | |
183 | } | |
184 | ||
4104d326 | 185 | static int trace_selftest_ops(struct trace_array *tr, int cnt) |
95950c2e SR |
186 | { |
187 | int save_ftrace_enabled = ftrace_enabled; | |
188 | struct ftrace_ops *dyn_ops; | |
189 | char *func1_name; | |
190 | char *func2_name; | |
191 | int len1; | |
192 | int len2; | |
193 | int ret = -1; | |
194 | ||
195 | printk(KERN_CONT "PASSED\n"); | |
196 | pr_info("Testing dynamic ftrace ops #%d: ", cnt); | |
197 | ||
198 | ftrace_enabled = 1; | |
199 | reset_counts(); | |
200 | ||
201 | /* Handle PPC64 '.' name */ | |
202 | func1_name = "*" __stringify(DYN_FTRACE_TEST_NAME); | |
203 | func2_name = "*" __stringify(DYN_FTRACE_TEST_NAME2); | |
204 | len1 = strlen(func1_name); | |
205 | len2 = strlen(func2_name); | |
206 | ||
207 | /* | |
208 | * Probe 1 will trace function 1. | |
209 | * Probe 2 will trace function 2. | |
210 | * Probe 3 will trace functions 1 and 2. | |
211 | */ | |
212 | ftrace_set_filter(&test_probe1, func1_name, len1, 1); | |
213 | ftrace_set_filter(&test_probe2, func2_name, len2, 1); | |
214 | ftrace_set_filter(&test_probe3, func1_name, len1, 1); | |
215 | ftrace_set_filter(&test_probe3, func2_name, len2, 0); | |
216 | ||
217 | register_ftrace_function(&test_probe1); | |
218 | register_ftrace_function(&test_probe2); | |
219 | register_ftrace_function(&test_probe3); | |
4104d326 SRRH |
220 | /* First time we are running with main function */ |
221 | if (cnt > 1) { | |
222 | ftrace_init_array_ops(tr, trace_selftest_test_global_func); | |
223 | register_ftrace_function(tr->ops); | |
224 | } | |
95950c2e SR |
225 | |
226 | DYN_FTRACE_TEST_NAME(); | |
227 | ||
228 | print_counts(); | |
229 | ||
230 | if (trace_selftest_test_probe1_cnt != 1) | |
231 | goto out; | |
232 | if (trace_selftest_test_probe2_cnt != 0) | |
233 | goto out; | |
234 | if (trace_selftest_test_probe3_cnt != 1) | |
235 | goto out; | |
4104d326 SRRH |
236 | if (cnt > 1) { |
237 | if (trace_selftest_test_global_cnt == 0) | |
238 | goto out; | |
239 | } | |
95950c2e SR |
240 | |
241 | DYN_FTRACE_TEST_NAME2(); | |
242 | ||
243 | print_counts(); | |
244 | ||
245 | if (trace_selftest_test_probe1_cnt != 1) | |
246 | goto out; | |
247 | if (trace_selftest_test_probe2_cnt != 1) | |
248 | goto out; | |
249 | if (trace_selftest_test_probe3_cnt != 2) | |
250 | goto out; | |
251 | ||
252 | /* Add a dynamic probe */ | |
253 | dyn_ops = kzalloc(sizeof(*dyn_ops), GFP_KERNEL); | |
254 | if (!dyn_ops) { | |
255 | printk("MEMORY ERROR "); | |
256 | goto out; | |
257 | } | |
258 | ||
259 | dyn_ops->func = trace_selftest_test_dyn_func; | |
260 | ||
261 | register_ftrace_function(dyn_ops); | |
262 | ||
263 | trace_selftest_test_global_cnt = 0; | |
264 | ||
265 | DYN_FTRACE_TEST_NAME(); | |
266 | ||
267 | print_counts(); | |
268 | ||
269 | if (trace_selftest_test_probe1_cnt != 2) | |
270 | goto out_free; | |
271 | if (trace_selftest_test_probe2_cnt != 1) | |
272 | goto out_free; | |
273 | if (trace_selftest_test_probe3_cnt != 3) | |
274 | goto out_free; | |
4104d326 SRRH |
275 | if (cnt > 1) { |
276 | if (trace_selftest_test_global_cnt == 0) | |
46320a6a | 277 | goto out_free; |
4104d326 | 278 | } |
95950c2e SR |
279 | if (trace_selftest_test_dyn_cnt == 0) |
280 | goto out_free; | |
281 | ||
282 | DYN_FTRACE_TEST_NAME2(); | |
283 | ||
284 | print_counts(); | |
285 | ||
286 | if (trace_selftest_test_probe1_cnt != 2) | |
287 | goto out_free; | |
288 | if (trace_selftest_test_probe2_cnt != 2) | |
289 | goto out_free; | |
290 | if (trace_selftest_test_probe3_cnt != 4) | |
291 | goto out_free; | |
292 | ||
293 | ret = 0; | |
294 | out_free: | |
295 | unregister_ftrace_function(dyn_ops); | |
296 | kfree(dyn_ops); | |
297 | ||
298 | out: | |
299 | /* Purposely unregister in the same order */ | |
300 | unregister_ftrace_function(&test_probe1); | |
301 | unregister_ftrace_function(&test_probe2); | |
302 | unregister_ftrace_function(&test_probe3); | |
4104d326 SRRH |
303 | if (cnt > 1) |
304 | unregister_ftrace_function(tr->ops); | |
305 | ftrace_reset_array_ops(tr); | |
95950c2e SR |
306 | |
307 | /* Make sure everything is off */ | |
308 | reset_counts(); | |
309 | DYN_FTRACE_TEST_NAME(); | |
310 | DYN_FTRACE_TEST_NAME(); | |
311 | ||
312 | if (trace_selftest_test_probe1_cnt || | |
313 | trace_selftest_test_probe2_cnt || | |
314 | trace_selftest_test_probe3_cnt || | |
315 | trace_selftest_test_global_cnt || | |
316 | trace_selftest_test_dyn_cnt) | |
317 | ret = -1; | |
318 | ||
319 | ftrace_enabled = save_ftrace_enabled; | |
320 | ||
321 | return ret; | |
322 | } | |
323 | ||
77a2b37d | 324 | /* Test dynamic code modification and ftrace filters */ |
ad1438a0 FF |
325 | static int trace_selftest_startup_dynamic_tracing(struct tracer *trace, |
326 | struct trace_array *tr, | |
327 | int (*func)(void)) | |
77a2b37d | 328 | { |
77a2b37d | 329 | int save_ftrace_enabled = ftrace_enabled; |
dd0e545f | 330 | unsigned long count; |
4e491d14 | 331 | char *func_name; |
dd0e545f | 332 | int ret; |
77a2b37d SR |
333 | |
334 | /* The ftrace test PASSED */ | |
335 | printk(KERN_CONT "PASSED\n"); | |
336 | pr_info("Testing dynamic ftrace: "); | |
337 | ||
338 | /* enable tracing, and record the filter function */ | |
339 | ftrace_enabled = 1; | |
77a2b37d SR |
340 | |
341 | /* passed in by parameter to fool gcc from optimizing */ | |
342 | func(); | |
343 | ||
4e491d14 | 344 | /* |
73d8b8bc | 345 | * Some archs *cough*PowerPC*cough* add characters to the |
4e491d14 | 346 | * start of the function names. We simply put a '*' to |
73d8b8bc | 347 | * accommodate them. |
4e491d14 | 348 | */ |
9cc26a26 | 349 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); |
4e491d14 | 350 | |
77a2b37d | 351 | /* filter only on our function */ |
936e074b | 352 | ftrace_set_global_filter(func_name, strlen(func_name), 1); |
77a2b37d SR |
353 | |
354 | /* enable tracing */ | |
b6f11df2 | 355 | ret = tracer_init(trace, tr); |
1c80025a FW |
356 | if (ret) { |
357 | warn_failed_init_tracer(trace, ret); | |
358 | goto out; | |
359 | } | |
dd0e545f | 360 | |
77a2b37d SR |
361 | /* Sleep for a 1/10 of a second */ |
362 | msleep(100); | |
363 | ||
364 | /* we should have nothing in the buffer */ | |
12883efb | 365 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
77a2b37d SR |
366 | if (ret) |
367 | goto out; | |
368 | ||
369 | if (count) { | |
370 | ret = -1; | |
371 | printk(KERN_CONT ".. filter did not filter .. "); | |
372 | goto out; | |
373 | } | |
374 | ||
375 | /* call our function again */ | |
376 | func(); | |
377 | ||
378 | /* sleep again */ | |
379 | msleep(100); | |
380 | ||
381 | /* stop the tracing. */ | |
bbf5b1a0 | 382 | tracing_stop(); |
77a2b37d SR |
383 | ftrace_enabled = 0; |
384 | ||
385 | /* check the trace buffer */ | |
12883efb | 386 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
3ddee63a SRRH |
387 | |
388 | ftrace_enabled = 1; | |
bbf5b1a0 | 389 | tracing_start(); |
77a2b37d SR |
390 | |
391 | /* we should only have one item */ | |
392 | if (!ret && count != 1) { | |
95950c2e | 393 | trace->reset(tr); |
06fa75ab | 394 | printk(KERN_CONT ".. filter failed count=%ld ..", count); |
77a2b37d SR |
395 | ret = -1; |
396 | goto out; | |
397 | } | |
bbf5b1a0 | 398 | |
95950c2e | 399 | /* Test the ops with global tracing running */ |
4104d326 | 400 | ret = trace_selftest_ops(tr, 1); |
95950c2e SR |
401 | trace->reset(tr); |
402 | ||
77a2b37d SR |
403 | out: |
404 | ftrace_enabled = save_ftrace_enabled; | |
77a2b37d SR |
405 | |
406 | /* Enable tracing on all functions again */ | |
936e074b | 407 | ftrace_set_global_filter(NULL, 0, 1); |
77a2b37d | 408 | |
95950c2e SR |
409 | /* Test the ops with global tracing off */ |
410 | if (!ret) | |
4104d326 | 411 | ret = trace_selftest_ops(tr, 2); |
95950c2e | 412 | |
77a2b37d SR |
413 | return ret; |
414 | } | |
ea701f11 SR |
415 | |
416 | static int trace_selftest_recursion_cnt; | |
417 | static void trace_selftest_test_recursion_func(unsigned long ip, | |
418 | unsigned long pip, | |
419 | struct ftrace_ops *op, | |
420 | struct pt_regs *pt_regs) | |
421 | { | |
422 | /* | |
423 | * This function is registered without the recursion safe flag. | |
424 | * The ftrace infrastructure should provide the recursion | |
425 | * protection. If not, this will crash the kernel! | |
426 | */ | |
9640388b SR |
427 | if (trace_selftest_recursion_cnt++ > 10) |
428 | return; | |
ea701f11 SR |
429 | DYN_FTRACE_TEST_NAME(); |
430 | } | |
431 | ||
432 | static void trace_selftest_test_recursion_safe_func(unsigned long ip, | |
433 | unsigned long pip, | |
434 | struct ftrace_ops *op, | |
435 | struct pt_regs *pt_regs) | |
436 | { | |
437 | /* | |
438 | * We said we would provide our own recursion. By calling | |
439 | * this function again, we should recurse back into this function | |
440 | * and count again. But this only happens if the arch supports | |
441 | * all of ftrace features and nothing else is using the function | |
442 | * tracing utility. | |
443 | */ | |
444 | if (trace_selftest_recursion_cnt++) | |
445 | return; | |
446 | DYN_FTRACE_TEST_NAME(); | |
447 | } | |
448 | ||
449 | static struct ftrace_ops test_rec_probe = { | |
450 | .func = trace_selftest_test_recursion_func, | |
451 | }; | |
452 | ||
453 | static struct ftrace_ops test_recsafe_probe = { | |
454 | .func = trace_selftest_test_recursion_safe_func, | |
455 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, | |
456 | }; | |
457 | ||
458 | static int | |
459 | trace_selftest_function_recursion(void) | |
460 | { | |
461 | int save_ftrace_enabled = ftrace_enabled; | |
ea701f11 SR |
462 | char *func_name; |
463 | int len; | |
464 | int ret; | |
ea701f11 SR |
465 | |
466 | /* The previous test PASSED */ | |
467 | pr_cont("PASSED\n"); | |
468 | pr_info("Testing ftrace recursion: "); | |
469 | ||
470 | ||
471 | /* enable tracing, and record the filter function */ | |
472 | ftrace_enabled = 1; | |
ea701f11 SR |
473 | |
474 | /* Handle PPC64 '.' name */ | |
475 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); | |
476 | len = strlen(func_name); | |
477 | ||
478 | ret = ftrace_set_filter(&test_rec_probe, func_name, len, 1); | |
479 | if (ret) { | |
480 | pr_cont("*Could not set filter* "); | |
481 | goto out; | |
482 | } | |
483 | ||
484 | ret = register_ftrace_function(&test_rec_probe); | |
485 | if (ret) { | |
486 | pr_cont("*could not register callback* "); | |
487 | goto out; | |
488 | } | |
489 | ||
490 | DYN_FTRACE_TEST_NAME(); | |
491 | ||
492 | unregister_ftrace_function(&test_rec_probe); | |
493 | ||
494 | ret = -1; | |
495 | if (trace_selftest_recursion_cnt != 1) { | |
496 | pr_cont("*callback not called once (%d)* ", | |
497 | trace_selftest_recursion_cnt); | |
498 | goto out; | |
499 | } | |
500 | ||
501 | trace_selftest_recursion_cnt = 1; | |
502 | ||
503 | pr_cont("PASSED\n"); | |
504 | pr_info("Testing ftrace recursion safe: "); | |
505 | ||
506 | ret = ftrace_set_filter(&test_recsafe_probe, func_name, len, 1); | |
507 | if (ret) { | |
508 | pr_cont("*Could not set filter* "); | |
509 | goto out; | |
510 | } | |
511 | ||
512 | ret = register_ftrace_function(&test_recsafe_probe); | |
513 | if (ret) { | |
514 | pr_cont("*could not register callback* "); | |
515 | goto out; | |
516 | } | |
517 | ||
518 | DYN_FTRACE_TEST_NAME(); | |
519 | ||
520 | unregister_ftrace_function(&test_recsafe_probe); | |
521 | ||
ea701f11 | 522 | ret = -1; |
05cbbf64 SR |
523 | if (trace_selftest_recursion_cnt != 2) { |
524 | pr_cont("*callback not called expected 2 times (%d)* ", | |
525 | trace_selftest_recursion_cnt); | |
ea701f11 SR |
526 | goto out; |
527 | } | |
528 | ||
529 | ret = 0; | |
530 | out: | |
531 | ftrace_enabled = save_ftrace_enabled; | |
ea701f11 SR |
532 | |
533 | return ret; | |
534 | } | |
77a2b37d SR |
535 | #else |
536 | # define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; }) | |
ea701f11 | 537 | # define trace_selftest_function_recursion() ({ 0; }) |
77a2b37d | 538 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
e9a22d1f | 539 | |
ad97772a SR |
540 | static enum { |
541 | TRACE_SELFTEST_REGS_START, | |
542 | TRACE_SELFTEST_REGS_FOUND, | |
543 | TRACE_SELFTEST_REGS_NOT_FOUND, | |
544 | } trace_selftest_regs_stat; | |
545 | ||
546 | static void trace_selftest_test_regs_func(unsigned long ip, | |
547 | unsigned long pip, | |
548 | struct ftrace_ops *op, | |
549 | struct pt_regs *pt_regs) | |
550 | { | |
551 | if (pt_regs) | |
552 | trace_selftest_regs_stat = TRACE_SELFTEST_REGS_FOUND; | |
553 | else | |
554 | trace_selftest_regs_stat = TRACE_SELFTEST_REGS_NOT_FOUND; | |
555 | } | |
556 | ||
557 | static struct ftrace_ops test_regs_probe = { | |
558 | .func = trace_selftest_test_regs_func, | |
559 | .flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_SAVE_REGS, | |
560 | }; | |
561 | ||
562 | static int | |
563 | trace_selftest_function_regs(void) | |
564 | { | |
565 | int save_ftrace_enabled = ftrace_enabled; | |
ad97772a SR |
566 | char *func_name; |
567 | int len; | |
568 | int ret; | |
569 | int supported = 0; | |
570 | ||
06aeaaea | 571 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
ad97772a SR |
572 | supported = 1; |
573 | #endif | |
574 | ||
575 | /* The previous test PASSED */ | |
576 | pr_cont("PASSED\n"); | |
577 | pr_info("Testing ftrace regs%s: ", | |
578 | !supported ? "(no arch support)" : ""); | |
579 | ||
580 | /* enable tracing, and record the filter function */ | |
581 | ftrace_enabled = 1; | |
ad97772a SR |
582 | |
583 | /* Handle PPC64 '.' name */ | |
584 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); | |
585 | len = strlen(func_name); | |
586 | ||
587 | ret = ftrace_set_filter(&test_regs_probe, func_name, len, 1); | |
588 | /* | |
589 | * If DYNAMIC_FTRACE is not set, then we just trace all functions. | |
590 | * This test really doesn't care. | |
591 | */ | |
592 | if (ret && ret != -ENODEV) { | |
593 | pr_cont("*Could not set filter* "); | |
594 | goto out; | |
595 | } | |
596 | ||
597 | ret = register_ftrace_function(&test_regs_probe); | |
598 | /* | |
599 | * Now if the arch does not support passing regs, then this should | |
600 | * have failed. | |
601 | */ | |
602 | if (!supported) { | |
603 | if (!ret) { | |
604 | pr_cont("*registered save-regs without arch support* "); | |
605 | goto out; | |
606 | } | |
607 | test_regs_probe.flags |= FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED; | |
608 | ret = register_ftrace_function(&test_regs_probe); | |
609 | } | |
610 | if (ret) { | |
611 | pr_cont("*could not register callback* "); | |
612 | goto out; | |
613 | } | |
614 | ||
615 | ||
616 | DYN_FTRACE_TEST_NAME(); | |
617 | ||
618 | unregister_ftrace_function(&test_regs_probe); | |
619 | ||
620 | ret = -1; | |
621 | ||
622 | switch (trace_selftest_regs_stat) { | |
623 | case TRACE_SELFTEST_REGS_START: | |
624 | pr_cont("*callback never called* "); | |
625 | goto out; | |
626 | ||
627 | case TRACE_SELFTEST_REGS_FOUND: | |
628 | if (supported) | |
629 | break; | |
630 | pr_cont("*callback received regs without arch support* "); | |
631 | goto out; | |
632 | ||
633 | case TRACE_SELFTEST_REGS_NOT_FOUND: | |
634 | if (!supported) | |
635 | break; | |
636 | pr_cont("*callback received NULL regs* "); | |
637 | goto out; | |
638 | } | |
639 | ||
640 | ret = 0; | |
641 | out: | |
642 | ftrace_enabled = save_ftrace_enabled; | |
ad97772a SR |
643 | |
644 | return ret; | |
645 | } | |
646 | ||
60a11774 SR |
647 | /* |
648 | * Simple verification test of ftrace function tracer. | |
649 | * Enable ftrace, sleep 1/10 second, and then read the trace | |
650 | * buffer to see if all is in order. | |
651 | */ | |
f1ed7c74 | 652 | __init int |
60a11774 SR |
653 | trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr) |
654 | { | |
77a2b37d | 655 | int save_ftrace_enabled = ftrace_enabled; |
dd0e545f SR |
656 | unsigned long count; |
657 | int ret; | |
60a11774 | 658 | |
f1ed7c74 SRRH |
659 | #ifdef CONFIG_DYNAMIC_FTRACE |
660 | if (ftrace_filter_param) { | |
661 | printk(KERN_CONT " ... kernel command line filter set: force PASS ... "); | |
662 | return 0; | |
663 | } | |
664 | #endif | |
665 | ||
77a2b37d SR |
666 | /* make sure msleep has been recorded */ |
667 | msleep(1); | |
668 | ||
60a11774 | 669 | /* start the tracing */ |
c7aafc54 IM |
670 | ftrace_enabled = 1; |
671 | ||
b6f11df2 | 672 | ret = tracer_init(trace, tr); |
1c80025a FW |
673 | if (ret) { |
674 | warn_failed_init_tracer(trace, ret); | |
675 | goto out; | |
676 | } | |
677 | ||
60a11774 SR |
678 | /* Sleep for a 1/10 of a second */ |
679 | msleep(100); | |
680 | /* stop the tracing. */ | |
bbf5b1a0 | 681 | tracing_stop(); |
c7aafc54 IM |
682 | ftrace_enabled = 0; |
683 | ||
60a11774 | 684 | /* check the trace buffer */ |
12883efb | 685 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
3ddee63a SRRH |
686 | |
687 | ftrace_enabled = 1; | |
60a11774 | 688 | trace->reset(tr); |
bbf5b1a0 | 689 | tracing_start(); |
60a11774 SR |
690 | |
691 | if (!ret && !count) { | |
692 | printk(KERN_CONT ".. no entries found .."); | |
693 | ret = -1; | |
77a2b37d | 694 | goto out; |
60a11774 SR |
695 | } |
696 | ||
77a2b37d SR |
697 | ret = trace_selftest_startup_dynamic_tracing(trace, tr, |
698 | DYN_FTRACE_TEST_NAME); | |
ea701f11 SR |
699 | if (ret) |
700 | goto out; | |
77a2b37d | 701 | |
ea701f11 | 702 | ret = trace_selftest_function_recursion(); |
ad97772a SR |
703 | if (ret) |
704 | goto out; | |
705 | ||
706 | ret = trace_selftest_function_regs(); | |
77a2b37d SR |
707 | out: |
708 | ftrace_enabled = save_ftrace_enabled; | |
77a2b37d | 709 | |
4eebcc81 SR |
710 | /* kill ftrace totally if we failed */ |
711 | if (ret) | |
712 | ftrace_kill(); | |
713 | ||
60a11774 SR |
714 | return ret; |
715 | } | |
606576ce | 716 | #endif /* CONFIG_FUNCTION_TRACER */ |
60a11774 | 717 | |
7447dce9 FW |
718 | |
719 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
cf586b61 FW |
720 | |
721 | /* Maximum number of functions to trace before diagnosing a hang */ | |
722 | #define GRAPH_MAX_FUNC_TEST 100000000 | |
723 | ||
cf586b61 FW |
724 | static unsigned int graph_hang_thresh; |
725 | ||
726 | /* Wrap the real function entry probe to avoid possible hanging */ | |
727 | static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace) | |
728 | { | |
729 | /* This is harmlessly racy, we want to approximately detect a hang */ | |
730 | if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) { | |
731 | ftrace_graph_stop(); | |
732 | printk(KERN_WARNING "BUG: Function graph tracer hang!\n"); | |
7fe70b57 SRRH |
733 | if (ftrace_dump_on_oops) { |
734 | ftrace_dump(DUMP_ALL); | |
735 | /* ftrace_dump() disables tracing */ | |
736 | tracing_on(); | |
737 | } | |
cf586b61 FW |
738 | return 0; |
739 | } | |
740 | ||
741 | return trace_graph_entry(trace); | |
742 | } | |
743 | ||
688f7089 SRV |
744 | static struct fgraph_ops fgraph_ops __initdata = { |
745 | .entryfunc = &trace_graph_entry_watchdog, | |
746 | .retfunc = &trace_graph_return, | |
747 | }; | |
748 | ||
7447dce9 FW |
749 | /* |
750 | * Pretty much the same than for the function tracer from which the selftest | |
751 | * has been borrowed. | |
752 | */ | |
f1ed7c74 | 753 | __init int |
7447dce9 FW |
754 | trace_selftest_startup_function_graph(struct tracer *trace, |
755 | struct trace_array *tr) | |
756 | { | |
757 | int ret; | |
758 | unsigned long count; | |
759 | ||
f1ed7c74 SRRH |
760 | #ifdef CONFIG_DYNAMIC_FTRACE |
761 | if (ftrace_filter_param) { | |
762 | printk(KERN_CONT " ... kernel command line filter set: force PASS ... "); | |
763 | return 0; | |
764 | } | |
765 | #endif | |
766 | ||
cf586b61 FW |
767 | /* |
768 | * Simulate the init() callback but we attach a watchdog callback | |
769 | * to detect and recover from possible hangs | |
770 | */ | |
12883efb | 771 | tracing_reset_online_cpus(&tr->trace_buffer); |
1a0799a8 | 772 | set_graph_array(tr); |
688f7089 | 773 | ret = register_ftrace_graph(&fgraph_ops); |
7447dce9 FW |
774 | if (ret) { |
775 | warn_failed_init_tracer(trace, ret); | |
776 | goto out; | |
777 | } | |
cf586b61 | 778 | tracing_start_cmdline_record(); |
7447dce9 FW |
779 | |
780 | /* Sleep for a 1/10 of a second */ | |
781 | msleep(100); | |
782 | ||
cf586b61 FW |
783 | /* Have we just recovered from a hang? */ |
784 | if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) { | |
0cf53ff6 | 785 | tracing_selftest_disabled = true; |
cf586b61 FW |
786 | ret = -1; |
787 | goto out; | |
788 | } | |
789 | ||
7447dce9 FW |
790 | tracing_stop(); |
791 | ||
792 | /* check the trace buffer */ | |
12883efb | 793 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
7447dce9 | 794 | |
52fde6e7 SRV |
795 | /* Need to also simulate the tr->reset to remove this fgraph_ops */ |
796 | tracing_stop_cmdline_record(); | |
797 | unregister_ftrace_graph(&fgraph_ops); | |
798 | ||
7447dce9 FW |
799 | tracing_start(); |
800 | ||
801 | if (!ret && !count) { | |
802 | printk(KERN_CONT ".. no entries found .."); | |
803 | ret = -1; | |
804 | goto out; | |
805 | } | |
806 | ||
807 | /* Don't test dynamic tracing, the function tracer already did */ | |
808 | ||
809 | out: | |
810 | /* Stop it if we failed */ | |
811 | if (ret) | |
812 | ftrace_graph_stop(); | |
813 | ||
814 | return ret; | |
815 | } | |
816 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
817 | ||
818 | ||
60a11774 SR |
819 | #ifdef CONFIG_IRQSOFF_TRACER |
820 | int | |
821 | trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr) | |
822 | { | |
6d9b3fa5 | 823 | unsigned long save_max = tr->max_latency; |
60a11774 SR |
824 | unsigned long count; |
825 | int ret; | |
826 | ||
827 | /* start the tracing */ | |
b6f11df2 | 828 | ret = tracer_init(trace, tr); |
1c80025a FW |
829 | if (ret) { |
830 | warn_failed_init_tracer(trace, ret); | |
831 | return ret; | |
832 | } | |
833 | ||
60a11774 | 834 | /* reset the max latency */ |
6d9b3fa5 | 835 | tr->max_latency = 0; |
60a11774 SR |
836 | /* disable interrupts for a bit */ |
837 | local_irq_disable(); | |
838 | udelay(100); | |
839 | local_irq_enable(); | |
49036200 FW |
840 | |
841 | /* | |
842 | * Stop the tracer to avoid a warning subsequent | |
843 | * to buffer flipping failure because tracing_stop() | |
844 | * disables the tr and max buffers, making flipping impossible | |
845 | * in case of parallels max irqs off latencies. | |
846 | */ | |
847 | trace->stop(tr); | |
60a11774 | 848 | /* stop the tracing. */ |
bbf5b1a0 | 849 | tracing_stop(); |
60a11774 | 850 | /* check both trace buffers */ |
12883efb | 851 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 | 852 | if (!ret) |
12883efb | 853 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 | 854 | trace->reset(tr); |
bbf5b1a0 | 855 | tracing_start(); |
60a11774 SR |
856 | |
857 | if (!ret && !count) { | |
858 | printk(KERN_CONT ".. no entries found .."); | |
859 | ret = -1; | |
860 | } | |
861 | ||
6d9b3fa5 | 862 | tr->max_latency = save_max; |
60a11774 SR |
863 | |
864 | return ret; | |
865 | } | |
866 | #endif /* CONFIG_IRQSOFF_TRACER */ | |
867 | ||
868 | #ifdef CONFIG_PREEMPT_TRACER | |
869 | int | |
870 | trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr) | |
871 | { | |
6d9b3fa5 | 872 | unsigned long save_max = tr->max_latency; |
60a11774 SR |
873 | unsigned long count; |
874 | int ret; | |
875 | ||
769c48eb SR |
876 | /* |
877 | * Now that the big kernel lock is no longer preemptable, | |
878 | * and this is called with the BKL held, it will always | |
879 | * fail. If preemption is already disabled, simply | |
880 | * pass the test. When the BKL is removed, or becomes | |
881 | * preemptible again, we will once again test this, | |
882 | * so keep it in. | |
883 | */ | |
884 | if (preempt_count()) { | |
885 | printk(KERN_CONT "can not test ... force "); | |
886 | return 0; | |
887 | } | |
888 | ||
60a11774 | 889 | /* start the tracing */ |
b6f11df2 | 890 | ret = tracer_init(trace, tr); |
1c80025a FW |
891 | if (ret) { |
892 | warn_failed_init_tracer(trace, ret); | |
893 | return ret; | |
894 | } | |
895 | ||
60a11774 | 896 | /* reset the max latency */ |
6d9b3fa5 | 897 | tr->max_latency = 0; |
60a11774 SR |
898 | /* disable preemption for a bit */ |
899 | preempt_disable(); | |
900 | udelay(100); | |
901 | preempt_enable(); | |
49036200 FW |
902 | |
903 | /* | |
904 | * Stop the tracer to avoid a warning subsequent | |
905 | * to buffer flipping failure because tracing_stop() | |
906 | * disables the tr and max buffers, making flipping impossible | |
907 | * in case of parallels max preempt off latencies. | |
908 | */ | |
909 | trace->stop(tr); | |
60a11774 | 910 | /* stop the tracing. */ |
bbf5b1a0 | 911 | tracing_stop(); |
60a11774 | 912 | /* check both trace buffers */ |
12883efb | 913 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 | 914 | if (!ret) |
12883efb | 915 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 | 916 | trace->reset(tr); |
bbf5b1a0 | 917 | tracing_start(); |
60a11774 SR |
918 | |
919 | if (!ret && !count) { | |
920 | printk(KERN_CONT ".. no entries found .."); | |
921 | ret = -1; | |
922 | } | |
923 | ||
6d9b3fa5 | 924 | tr->max_latency = save_max; |
60a11774 SR |
925 | |
926 | return ret; | |
927 | } | |
928 | #endif /* CONFIG_PREEMPT_TRACER */ | |
929 | ||
930 | #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) | |
931 | int | |
932 | trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr) | |
933 | { | |
6d9b3fa5 | 934 | unsigned long save_max = tr->max_latency; |
60a11774 SR |
935 | unsigned long count; |
936 | int ret; | |
937 | ||
769c48eb SR |
938 | /* |
939 | * Now that the big kernel lock is no longer preemptable, | |
940 | * and this is called with the BKL held, it will always | |
941 | * fail. If preemption is already disabled, simply | |
942 | * pass the test. When the BKL is removed, or becomes | |
943 | * preemptible again, we will once again test this, | |
944 | * so keep it in. | |
945 | */ | |
946 | if (preempt_count()) { | |
947 | printk(KERN_CONT "can not test ... force "); | |
948 | return 0; | |
949 | } | |
950 | ||
60a11774 | 951 | /* start the tracing */ |
b6f11df2 | 952 | ret = tracer_init(trace, tr); |
1c80025a FW |
953 | if (ret) { |
954 | warn_failed_init_tracer(trace, ret); | |
ac1d52d0 | 955 | goto out_no_start; |
1c80025a | 956 | } |
60a11774 SR |
957 | |
958 | /* reset the max latency */ | |
6d9b3fa5 | 959 | tr->max_latency = 0; |
60a11774 SR |
960 | |
961 | /* disable preemption and interrupts for a bit */ | |
962 | preempt_disable(); | |
963 | local_irq_disable(); | |
964 | udelay(100); | |
965 | preempt_enable(); | |
966 | /* reverse the order of preempt vs irqs */ | |
967 | local_irq_enable(); | |
968 | ||
49036200 FW |
969 | /* |
970 | * Stop the tracer to avoid a warning subsequent | |
971 | * to buffer flipping failure because tracing_stop() | |
972 | * disables the tr and max buffers, making flipping impossible | |
973 | * in case of parallels max irqs/preempt off latencies. | |
974 | */ | |
975 | trace->stop(tr); | |
60a11774 | 976 | /* stop the tracing. */ |
bbf5b1a0 | 977 | tracing_stop(); |
60a11774 | 978 | /* check both trace buffers */ |
12883efb | 979 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
ac1d52d0 | 980 | if (ret) |
60a11774 SR |
981 | goto out; |
982 | ||
12883efb | 983 | ret = trace_test_buffer(&tr->max_buffer, &count); |
ac1d52d0 | 984 | if (ret) |
60a11774 SR |
985 | goto out; |
986 | ||
987 | if (!ret && !count) { | |
988 | printk(KERN_CONT ".. no entries found .."); | |
989 | ret = -1; | |
990 | goto out; | |
991 | } | |
992 | ||
993 | /* do the test by disabling interrupts first this time */ | |
6d9b3fa5 | 994 | tr->max_latency = 0; |
bbf5b1a0 | 995 | tracing_start(); |
49036200 FW |
996 | trace->start(tr); |
997 | ||
60a11774 SR |
998 | preempt_disable(); |
999 | local_irq_disable(); | |
1000 | udelay(100); | |
1001 | preempt_enable(); | |
1002 | /* reverse the order of preempt vs irqs */ | |
1003 | local_irq_enable(); | |
1004 | ||
49036200 | 1005 | trace->stop(tr); |
60a11774 | 1006 | /* stop the tracing. */ |
bbf5b1a0 | 1007 | tracing_stop(); |
60a11774 | 1008 | /* check both trace buffers */ |
12883efb | 1009 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 SR |
1010 | if (ret) |
1011 | goto out; | |
1012 | ||
12883efb | 1013 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 SR |
1014 | |
1015 | if (!ret && !count) { | |
1016 | printk(KERN_CONT ".. no entries found .."); | |
1017 | ret = -1; | |
1018 | goto out; | |
1019 | } | |
1020 | ||
ac1d52d0 | 1021 | out: |
bbf5b1a0 | 1022 | tracing_start(); |
ac1d52d0 FW |
1023 | out_no_start: |
1024 | trace->reset(tr); | |
6d9b3fa5 | 1025 | tr->max_latency = save_max; |
60a11774 SR |
1026 | |
1027 | return ret; | |
1028 | } | |
1029 | #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */ | |
1030 | ||
fb1b6d8b SN |
1031 | #ifdef CONFIG_NOP_TRACER |
1032 | int | |
1033 | trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr) | |
1034 | { | |
1035 | /* What could possibly go wrong? */ | |
1036 | return 0; | |
1037 | } | |
1038 | #endif | |
1039 | ||
60a11774 | 1040 | #ifdef CONFIG_SCHED_TRACER |
addff1fe SR |
1041 | |
1042 | struct wakeup_test_data { | |
1043 | struct completion is_ready; | |
1044 | int go; | |
1045 | }; | |
1046 | ||
60a11774 SR |
1047 | static int trace_wakeup_test_thread(void *data) |
1048 | { | |
af6ace76 DF |
1049 | /* Make this a -deadline thread */ |
1050 | static const struct sched_attr attr = { | |
1051 | .sched_policy = SCHED_DEADLINE, | |
1052 | .sched_runtime = 100000ULL, | |
1053 | .sched_deadline = 10000000ULL, | |
1054 | .sched_period = 10000000ULL | |
1055 | }; | |
addff1fe | 1056 | struct wakeup_test_data *x = data; |
60a11774 | 1057 | |
af6ace76 | 1058 | sched_setattr(current, &attr); |
60a11774 SR |
1059 | |
1060 | /* Make it know we have a new prio */ | |
addff1fe | 1061 | complete(&x->is_ready); |
60a11774 SR |
1062 | |
1063 | /* now go to sleep and let the test wake us up */ | |
1064 | set_current_state(TASK_INTERRUPTIBLE); | |
addff1fe SR |
1065 | while (!x->go) { |
1066 | schedule(); | |
1067 | set_current_state(TASK_INTERRUPTIBLE); | |
1068 | } | |
60a11774 | 1069 | |
addff1fe SR |
1070 | complete(&x->is_ready); |
1071 | ||
1072 | set_current_state(TASK_INTERRUPTIBLE); | |
3c18c10b | 1073 | |
60a11774 SR |
1074 | /* we are awake, now wait to disappear */ |
1075 | while (!kthread_should_stop()) { | |
addff1fe SR |
1076 | schedule(); |
1077 | set_current_state(TASK_INTERRUPTIBLE); | |
60a11774 SR |
1078 | } |
1079 | ||
addff1fe SR |
1080 | __set_current_state(TASK_RUNNING); |
1081 | ||
60a11774 SR |
1082 | return 0; |
1083 | } | |
60a11774 SR |
1084 | int |
1085 | trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr) | |
1086 | { | |
6d9b3fa5 | 1087 | unsigned long save_max = tr->max_latency; |
60a11774 | 1088 | struct task_struct *p; |
addff1fe | 1089 | struct wakeup_test_data data; |
60a11774 SR |
1090 | unsigned long count; |
1091 | int ret; | |
1092 | ||
addff1fe SR |
1093 | memset(&data, 0, sizeof(data)); |
1094 | ||
1095 | init_completion(&data.is_ready); | |
60a11774 | 1096 | |
af6ace76 | 1097 | /* create a -deadline thread */ |
addff1fe | 1098 | p = kthread_run(trace_wakeup_test_thread, &data, "ftrace-test"); |
c7aafc54 | 1099 | if (IS_ERR(p)) { |
60a11774 SR |
1100 | printk(KERN_CONT "Failed to create ftrace wakeup test thread "); |
1101 | return -1; | |
1102 | } | |
1103 | ||
af6ace76 | 1104 | /* make sure the thread is running at -deadline policy */ |
addff1fe | 1105 | wait_for_completion(&data.is_ready); |
60a11774 SR |
1106 | |
1107 | /* start the tracing */ | |
b6f11df2 | 1108 | ret = tracer_init(trace, tr); |
1c80025a FW |
1109 | if (ret) { |
1110 | warn_failed_init_tracer(trace, ret); | |
1111 | return ret; | |
1112 | } | |
1113 | ||
60a11774 | 1114 | /* reset the max latency */ |
6d9b3fa5 | 1115 | tr->max_latency = 0; |
60a11774 | 1116 | |
3c18c10b SR |
1117 | while (p->on_rq) { |
1118 | /* | |
af6ace76 | 1119 | * Sleep to make sure the -deadline thread is asleep too. |
3c18c10b SR |
1120 | * On virtual machines we can't rely on timings, |
1121 | * but we want to make sure this test still works. | |
1122 | */ | |
1123 | msleep(100); | |
1124 | } | |
60a11774 | 1125 | |
addff1fe SR |
1126 | init_completion(&data.is_ready); |
1127 | ||
1128 | data.go = 1; | |
1129 | /* memory barrier is in the wake_up_process() */ | |
60a11774 SR |
1130 | |
1131 | wake_up_process(p); | |
1132 | ||
3c18c10b | 1133 | /* Wait for the task to wake up */ |
addff1fe | 1134 | wait_for_completion(&data.is_ready); |
5aa60c60 | 1135 | |
60a11774 | 1136 | /* stop the tracing. */ |
bbf5b1a0 | 1137 | tracing_stop(); |
60a11774 | 1138 | /* check both trace buffers */ |
12883efb | 1139 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 | 1140 | if (!ret) |
12883efb | 1141 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 SR |
1142 | |
1143 | ||
1144 | trace->reset(tr); | |
bbf5b1a0 | 1145 | tracing_start(); |
60a11774 | 1146 | |
6d9b3fa5 | 1147 | tr->max_latency = save_max; |
60a11774 SR |
1148 | |
1149 | /* kill the thread */ | |
1150 | kthread_stop(p); | |
1151 | ||
1152 | if (!ret && !count) { | |
1153 | printk(KERN_CONT ".. no entries found .."); | |
1154 | ret = -1; | |
1155 | } | |
1156 | ||
1157 | return ret; | |
1158 | } | |
1159 | #endif /* CONFIG_SCHED_TRACER */ | |
1160 | ||
80e5ea45 SR |
1161 | #ifdef CONFIG_BRANCH_TRACER |
1162 | int | |
1163 | trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr) | |
1164 | { | |
1165 | unsigned long count; | |
1166 | int ret; | |
1167 | ||
1168 | /* start the tracing */ | |
b6f11df2 | 1169 | ret = tracer_init(trace, tr); |
1c80025a FW |
1170 | if (ret) { |
1171 | warn_failed_init_tracer(trace, ret); | |
1172 | return ret; | |
1173 | } | |
1174 | ||
80e5ea45 SR |
1175 | /* Sleep for a 1/10 of a second */ |
1176 | msleep(100); | |
1177 | /* stop the tracing. */ | |
1178 | tracing_stop(); | |
1179 | /* check the trace buffer */ | |
0184d50f | 1180 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
80e5ea45 SR |
1181 | trace->reset(tr); |
1182 | tracing_start(); | |
1183 | ||
d2ef7c2f WH |
1184 | if (!ret && !count) { |
1185 | printk(KERN_CONT ".. no entries found .."); | |
1186 | ret = -1; | |
1187 | } | |
1188 | ||
80e5ea45 SR |
1189 | return ret; |
1190 | } | |
1191 | #endif /* CONFIG_BRANCH_TRACER */ | |
321bb5e1 | 1192 |