]>
Commit | Line | Data |
---|---|---|
60a11774 SR |
1 | /* Include in trace.c */ |
2 | ||
ae7e81c0 | 3 | #include <uapi/linux/sched/types.h> |
9cc26a26 | 4 | #include <linux/stringify.h> |
60a11774 | 5 | #include <linux/kthread.h> |
c7aafc54 | 6 | #include <linux/delay.h> |
5a0e3ad6 | 7 | #include <linux/slab.h> |
60a11774 | 8 | |
e309b41d | 9 | static inline int trace_valid_entry(struct trace_entry *entry) |
60a11774 SR |
10 | { |
11 | switch (entry->type) { | |
12 | case TRACE_FN: | |
13 | case TRACE_CTX: | |
57422797 | 14 | case TRACE_WAKE: |
06fa75ab | 15 | case TRACE_STACK: |
dd0e545f | 16 | case TRACE_PRINT: |
80e5ea45 | 17 | case TRACE_BRANCH: |
7447dce9 FW |
18 | case TRACE_GRAPH_ENT: |
19 | case TRACE_GRAPH_RET: | |
60a11774 SR |
20 | return 1; |
21 | } | |
22 | return 0; | |
23 | } | |
24 | ||
12883efb | 25 | static int trace_test_buffer_cpu(struct trace_buffer *buf, int cpu) |
60a11774 | 26 | { |
3928a8a2 SR |
27 | struct ring_buffer_event *event; |
28 | struct trace_entry *entry; | |
4b3e3d22 | 29 | unsigned int loops = 0; |
60a11774 | 30 | |
12883efb | 31 | while ((event = ring_buffer_consume(buf->buffer, cpu, NULL, NULL))) { |
3928a8a2 | 32 | entry = ring_buffer_event_data(event); |
60a11774 | 33 | |
4b3e3d22 SR |
34 | /* |
35 | * The ring buffer is a size of trace_buf_size, if | |
36 | * we loop more than the size, there's something wrong | |
37 | * with the ring buffer. | |
38 | */ | |
39 | if (loops++ > trace_buf_size) { | |
40 | printk(KERN_CONT ".. bad ring buffer "); | |
41 | goto failed; | |
42 | } | |
3928a8a2 | 43 | if (!trace_valid_entry(entry)) { |
c7aafc54 | 44 | printk(KERN_CONT ".. invalid entry %d ", |
3928a8a2 | 45 | entry->type); |
60a11774 SR |
46 | goto failed; |
47 | } | |
60a11774 | 48 | } |
60a11774 SR |
49 | return 0; |
50 | ||
51 | failed: | |
08bafa0e SR |
52 | /* disable tracing */ |
53 | tracing_disabled = 1; | |
60a11774 SR |
54 | printk(KERN_CONT ".. corrupted trace buffer .. "); |
55 | return -1; | |
56 | } | |
57 | ||
58 | /* | |
59 | * Test the trace buffer to see if all the elements | |
60 | * are still sane. | |
61 | */ | |
12883efb | 62 | static int trace_test_buffer(struct trace_buffer *buf, unsigned long *count) |
60a11774 | 63 | { |
30afdcb1 SR |
64 | unsigned long flags, cnt = 0; |
65 | int cpu, ret = 0; | |
60a11774 | 66 | |
30afdcb1 | 67 | /* Don't allow flipping of max traces now */ |
d51ad7ac | 68 | local_irq_save(flags); |
0b9b12c1 | 69 | arch_spin_lock(&buf->tr->max_lock); |
60a11774 | 70 | |
12883efb | 71 | cnt = ring_buffer_entries(buf->buffer); |
60a11774 | 72 | |
0c5119c1 SR |
73 | /* |
74 | * The trace_test_buffer_cpu runs a while loop to consume all data. | |
75 | * If the calling tracer is broken, and is constantly filling | |
76 | * the buffer, this will run forever, and hard lock the box. | |
77 | * We disable the ring buffer while we do this test to prevent | |
78 | * a hard lock up. | |
79 | */ | |
80 | tracing_off(); | |
3928a8a2 | 81 | for_each_possible_cpu(cpu) { |
12883efb | 82 | ret = trace_test_buffer_cpu(buf, cpu); |
60a11774 SR |
83 | if (ret) |
84 | break; | |
85 | } | |
0c5119c1 | 86 | tracing_on(); |
0b9b12c1 | 87 | arch_spin_unlock(&buf->tr->max_lock); |
d51ad7ac | 88 | local_irq_restore(flags); |
60a11774 SR |
89 | |
90 | if (count) | |
91 | *count = cnt; | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
1c80025a FW |
96 | static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret) |
97 | { | |
98 | printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n", | |
99 | trace->name, init_ret); | |
100 | } | |
606576ce | 101 | #ifdef CONFIG_FUNCTION_TRACER |
77a2b37d SR |
102 | |
103 | #ifdef CONFIG_DYNAMIC_FTRACE | |
104 | ||
95950c2e SR |
105 | static int trace_selftest_test_probe1_cnt; |
106 | static void trace_selftest_test_probe1_func(unsigned long ip, | |
2f5f6ad9 | 107 | unsigned long pip, |
a1e2e31d SR |
108 | struct ftrace_ops *op, |
109 | struct pt_regs *pt_regs) | |
95950c2e SR |
110 | { |
111 | trace_selftest_test_probe1_cnt++; | |
112 | } | |
113 | ||
114 | static int trace_selftest_test_probe2_cnt; | |
115 | static void trace_selftest_test_probe2_func(unsigned long ip, | |
2f5f6ad9 | 116 | unsigned long pip, |
a1e2e31d SR |
117 | struct ftrace_ops *op, |
118 | struct pt_regs *pt_regs) | |
95950c2e SR |
119 | { |
120 | trace_selftest_test_probe2_cnt++; | |
121 | } | |
122 | ||
123 | static int trace_selftest_test_probe3_cnt; | |
124 | static void trace_selftest_test_probe3_func(unsigned long ip, | |
2f5f6ad9 | 125 | unsigned long pip, |
a1e2e31d SR |
126 | struct ftrace_ops *op, |
127 | struct pt_regs *pt_regs) | |
95950c2e SR |
128 | { |
129 | trace_selftest_test_probe3_cnt++; | |
130 | } | |
131 | ||
132 | static int trace_selftest_test_global_cnt; | |
133 | static void trace_selftest_test_global_func(unsigned long ip, | |
2f5f6ad9 | 134 | unsigned long pip, |
a1e2e31d SR |
135 | struct ftrace_ops *op, |
136 | struct pt_regs *pt_regs) | |
95950c2e SR |
137 | { |
138 | trace_selftest_test_global_cnt++; | |
139 | } | |
140 | ||
141 | static int trace_selftest_test_dyn_cnt; | |
142 | static void trace_selftest_test_dyn_func(unsigned long ip, | |
2f5f6ad9 | 143 | unsigned long pip, |
a1e2e31d SR |
144 | struct ftrace_ops *op, |
145 | struct pt_regs *pt_regs) | |
95950c2e SR |
146 | { |
147 | trace_selftest_test_dyn_cnt++; | |
148 | } | |
149 | ||
150 | static struct ftrace_ops test_probe1 = { | |
151 | .func = trace_selftest_test_probe1_func, | |
4740974a | 152 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
95950c2e SR |
153 | }; |
154 | ||
155 | static struct ftrace_ops test_probe2 = { | |
156 | .func = trace_selftest_test_probe2_func, | |
4740974a | 157 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
95950c2e SR |
158 | }; |
159 | ||
160 | static struct ftrace_ops test_probe3 = { | |
161 | .func = trace_selftest_test_probe3_func, | |
4740974a | 162 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
95950c2e SR |
163 | }; |
164 | ||
95950c2e SR |
165 | static void print_counts(void) |
166 | { | |
167 | printk("(%d %d %d %d %d) ", | |
168 | trace_selftest_test_probe1_cnt, | |
169 | trace_selftest_test_probe2_cnt, | |
170 | trace_selftest_test_probe3_cnt, | |
171 | trace_selftest_test_global_cnt, | |
172 | trace_selftest_test_dyn_cnt); | |
173 | } | |
174 | ||
175 | static void reset_counts(void) | |
176 | { | |
177 | trace_selftest_test_probe1_cnt = 0; | |
178 | trace_selftest_test_probe2_cnt = 0; | |
179 | trace_selftest_test_probe3_cnt = 0; | |
180 | trace_selftest_test_global_cnt = 0; | |
181 | trace_selftest_test_dyn_cnt = 0; | |
182 | } | |
183 | ||
4104d326 | 184 | static int trace_selftest_ops(struct trace_array *tr, int cnt) |
95950c2e SR |
185 | { |
186 | int save_ftrace_enabled = ftrace_enabled; | |
187 | struct ftrace_ops *dyn_ops; | |
188 | char *func1_name; | |
189 | char *func2_name; | |
190 | int len1; | |
191 | int len2; | |
192 | int ret = -1; | |
193 | ||
194 | printk(KERN_CONT "PASSED\n"); | |
195 | pr_info("Testing dynamic ftrace ops #%d: ", cnt); | |
196 | ||
197 | ftrace_enabled = 1; | |
198 | reset_counts(); | |
199 | ||
200 | /* Handle PPC64 '.' name */ | |
201 | func1_name = "*" __stringify(DYN_FTRACE_TEST_NAME); | |
202 | func2_name = "*" __stringify(DYN_FTRACE_TEST_NAME2); | |
203 | len1 = strlen(func1_name); | |
204 | len2 = strlen(func2_name); | |
205 | ||
206 | /* | |
207 | * Probe 1 will trace function 1. | |
208 | * Probe 2 will trace function 2. | |
209 | * Probe 3 will trace functions 1 and 2. | |
210 | */ | |
211 | ftrace_set_filter(&test_probe1, func1_name, len1, 1); | |
212 | ftrace_set_filter(&test_probe2, func2_name, len2, 1); | |
213 | ftrace_set_filter(&test_probe3, func1_name, len1, 1); | |
214 | ftrace_set_filter(&test_probe3, func2_name, len2, 0); | |
215 | ||
216 | register_ftrace_function(&test_probe1); | |
217 | register_ftrace_function(&test_probe2); | |
218 | register_ftrace_function(&test_probe3); | |
4104d326 SRRH |
219 | /* First time we are running with main function */ |
220 | if (cnt > 1) { | |
221 | ftrace_init_array_ops(tr, trace_selftest_test_global_func); | |
222 | register_ftrace_function(tr->ops); | |
223 | } | |
95950c2e SR |
224 | |
225 | DYN_FTRACE_TEST_NAME(); | |
226 | ||
227 | print_counts(); | |
228 | ||
229 | if (trace_selftest_test_probe1_cnt != 1) | |
230 | goto out; | |
231 | if (trace_selftest_test_probe2_cnt != 0) | |
232 | goto out; | |
233 | if (trace_selftest_test_probe3_cnt != 1) | |
234 | goto out; | |
4104d326 SRRH |
235 | if (cnt > 1) { |
236 | if (trace_selftest_test_global_cnt == 0) | |
237 | goto out; | |
238 | } | |
95950c2e SR |
239 | |
240 | DYN_FTRACE_TEST_NAME2(); | |
241 | ||
242 | print_counts(); | |
243 | ||
244 | if (trace_selftest_test_probe1_cnt != 1) | |
245 | goto out; | |
246 | if (trace_selftest_test_probe2_cnt != 1) | |
247 | goto out; | |
248 | if (trace_selftest_test_probe3_cnt != 2) | |
249 | goto out; | |
250 | ||
251 | /* Add a dynamic probe */ | |
252 | dyn_ops = kzalloc(sizeof(*dyn_ops), GFP_KERNEL); | |
253 | if (!dyn_ops) { | |
254 | printk("MEMORY ERROR "); | |
255 | goto out; | |
256 | } | |
257 | ||
258 | dyn_ops->func = trace_selftest_test_dyn_func; | |
259 | ||
260 | register_ftrace_function(dyn_ops); | |
261 | ||
262 | trace_selftest_test_global_cnt = 0; | |
263 | ||
264 | DYN_FTRACE_TEST_NAME(); | |
265 | ||
266 | print_counts(); | |
267 | ||
268 | if (trace_selftest_test_probe1_cnt != 2) | |
269 | goto out_free; | |
270 | if (trace_selftest_test_probe2_cnt != 1) | |
271 | goto out_free; | |
272 | if (trace_selftest_test_probe3_cnt != 3) | |
273 | goto out_free; | |
4104d326 SRRH |
274 | if (cnt > 1) { |
275 | if (trace_selftest_test_global_cnt == 0) | |
276 | goto out; | |
277 | } | |
95950c2e SR |
278 | if (trace_selftest_test_dyn_cnt == 0) |
279 | goto out_free; | |
280 | ||
281 | DYN_FTRACE_TEST_NAME2(); | |
282 | ||
283 | print_counts(); | |
284 | ||
285 | if (trace_selftest_test_probe1_cnt != 2) | |
286 | goto out_free; | |
287 | if (trace_selftest_test_probe2_cnt != 2) | |
288 | goto out_free; | |
289 | if (trace_selftest_test_probe3_cnt != 4) | |
290 | goto out_free; | |
291 | ||
292 | ret = 0; | |
293 | out_free: | |
294 | unregister_ftrace_function(dyn_ops); | |
295 | kfree(dyn_ops); | |
296 | ||
297 | out: | |
298 | /* Purposely unregister in the same order */ | |
299 | unregister_ftrace_function(&test_probe1); | |
300 | unregister_ftrace_function(&test_probe2); | |
301 | unregister_ftrace_function(&test_probe3); | |
4104d326 SRRH |
302 | if (cnt > 1) |
303 | unregister_ftrace_function(tr->ops); | |
304 | ftrace_reset_array_ops(tr); | |
95950c2e SR |
305 | |
306 | /* Make sure everything is off */ | |
307 | reset_counts(); | |
308 | DYN_FTRACE_TEST_NAME(); | |
309 | DYN_FTRACE_TEST_NAME(); | |
310 | ||
311 | if (trace_selftest_test_probe1_cnt || | |
312 | trace_selftest_test_probe2_cnt || | |
313 | trace_selftest_test_probe3_cnt || | |
314 | trace_selftest_test_global_cnt || | |
315 | trace_selftest_test_dyn_cnt) | |
316 | ret = -1; | |
317 | ||
318 | ftrace_enabled = save_ftrace_enabled; | |
319 | ||
320 | return ret; | |
321 | } | |
322 | ||
77a2b37d | 323 | /* Test dynamic code modification and ftrace filters */ |
ad1438a0 FF |
324 | static int trace_selftest_startup_dynamic_tracing(struct tracer *trace, |
325 | struct trace_array *tr, | |
326 | int (*func)(void)) | |
77a2b37d | 327 | { |
77a2b37d | 328 | int save_ftrace_enabled = ftrace_enabled; |
dd0e545f | 329 | unsigned long count; |
4e491d14 | 330 | char *func_name; |
dd0e545f | 331 | int ret; |
77a2b37d SR |
332 | |
333 | /* The ftrace test PASSED */ | |
334 | printk(KERN_CONT "PASSED\n"); | |
335 | pr_info("Testing dynamic ftrace: "); | |
336 | ||
337 | /* enable tracing, and record the filter function */ | |
338 | ftrace_enabled = 1; | |
77a2b37d SR |
339 | |
340 | /* passed in by parameter to fool gcc from optimizing */ | |
341 | func(); | |
342 | ||
4e491d14 | 343 | /* |
73d8b8bc | 344 | * Some archs *cough*PowerPC*cough* add characters to the |
4e491d14 | 345 | * start of the function names. We simply put a '*' to |
73d8b8bc | 346 | * accommodate them. |
4e491d14 | 347 | */ |
9cc26a26 | 348 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); |
4e491d14 | 349 | |
77a2b37d | 350 | /* filter only on our function */ |
936e074b | 351 | ftrace_set_global_filter(func_name, strlen(func_name), 1); |
77a2b37d SR |
352 | |
353 | /* enable tracing */ | |
b6f11df2 | 354 | ret = tracer_init(trace, tr); |
1c80025a FW |
355 | if (ret) { |
356 | warn_failed_init_tracer(trace, ret); | |
357 | goto out; | |
358 | } | |
dd0e545f | 359 | |
77a2b37d SR |
360 | /* Sleep for a 1/10 of a second */ |
361 | msleep(100); | |
362 | ||
363 | /* we should have nothing in the buffer */ | |
12883efb | 364 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
77a2b37d SR |
365 | if (ret) |
366 | goto out; | |
367 | ||
368 | if (count) { | |
369 | ret = -1; | |
370 | printk(KERN_CONT ".. filter did not filter .. "); | |
371 | goto out; | |
372 | } | |
373 | ||
374 | /* call our function again */ | |
375 | func(); | |
376 | ||
377 | /* sleep again */ | |
378 | msleep(100); | |
379 | ||
380 | /* stop the tracing. */ | |
bbf5b1a0 | 381 | tracing_stop(); |
77a2b37d SR |
382 | ftrace_enabled = 0; |
383 | ||
384 | /* check the trace buffer */ | |
12883efb | 385 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
3ddee63a SRRH |
386 | |
387 | ftrace_enabled = 1; | |
bbf5b1a0 | 388 | tracing_start(); |
77a2b37d SR |
389 | |
390 | /* we should only have one item */ | |
391 | if (!ret && count != 1) { | |
95950c2e | 392 | trace->reset(tr); |
06fa75ab | 393 | printk(KERN_CONT ".. filter failed count=%ld ..", count); |
77a2b37d SR |
394 | ret = -1; |
395 | goto out; | |
396 | } | |
bbf5b1a0 | 397 | |
95950c2e | 398 | /* Test the ops with global tracing running */ |
4104d326 | 399 | ret = trace_selftest_ops(tr, 1); |
95950c2e SR |
400 | trace->reset(tr); |
401 | ||
77a2b37d SR |
402 | out: |
403 | ftrace_enabled = save_ftrace_enabled; | |
77a2b37d SR |
404 | |
405 | /* Enable tracing on all functions again */ | |
936e074b | 406 | ftrace_set_global_filter(NULL, 0, 1); |
77a2b37d | 407 | |
95950c2e SR |
408 | /* Test the ops with global tracing off */ |
409 | if (!ret) | |
4104d326 | 410 | ret = trace_selftest_ops(tr, 2); |
95950c2e | 411 | |
77a2b37d SR |
412 | return ret; |
413 | } | |
ea701f11 SR |
414 | |
415 | static int trace_selftest_recursion_cnt; | |
416 | static void trace_selftest_test_recursion_func(unsigned long ip, | |
417 | unsigned long pip, | |
418 | struct ftrace_ops *op, | |
419 | struct pt_regs *pt_regs) | |
420 | { | |
421 | /* | |
422 | * This function is registered without the recursion safe flag. | |
423 | * The ftrace infrastructure should provide the recursion | |
424 | * protection. If not, this will crash the kernel! | |
425 | */ | |
9640388b SR |
426 | if (trace_selftest_recursion_cnt++ > 10) |
427 | return; | |
ea701f11 SR |
428 | DYN_FTRACE_TEST_NAME(); |
429 | } | |
430 | ||
431 | static void trace_selftest_test_recursion_safe_func(unsigned long ip, | |
432 | unsigned long pip, | |
433 | struct ftrace_ops *op, | |
434 | struct pt_regs *pt_regs) | |
435 | { | |
436 | /* | |
437 | * We said we would provide our own recursion. By calling | |
438 | * this function again, we should recurse back into this function | |
439 | * and count again. But this only happens if the arch supports | |
440 | * all of ftrace features and nothing else is using the function | |
441 | * tracing utility. | |
442 | */ | |
443 | if (trace_selftest_recursion_cnt++) | |
444 | return; | |
445 | DYN_FTRACE_TEST_NAME(); | |
446 | } | |
447 | ||
448 | static struct ftrace_ops test_rec_probe = { | |
449 | .func = trace_selftest_test_recursion_func, | |
450 | }; | |
451 | ||
452 | static struct ftrace_ops test_recsafe_probe = { | |
453 | .func = trace_selftest_test_recursion_safe_func, | |
454 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, | |
455 | }; | |
456 | ||
457 | static int | |
458 | trace_selftest_function_recursion(void) | |
459 | { | |
460 | int save_ftrace_enabled = ftrace_enabled; | |
ea701f11 SR |
461 | char *func_name; |
462 | int len; | |
463 | int ret; | |
ea701f11 SR |
464 | |
465 | /* The previous test PASSED */ | |
466 | pr_cont("PASSED\n"); | |
467 | pr_info("Testing ftrace recursion: "); | |
468 | ||
469 | ||
470 | /* enable tracing, and record the filter function */ | |
471 | ftrace_enabled = 1; | |
ea701f11 SR |
472 | |
473 | /* Handle PPC64 '.' name */ | |
474 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); | |
475 | len = strlen(func_name); | |
476 | ||
477 | ret = ftrace_set_filter(&test_rec_probe, func_name, len, 1); | |
478 | if (ret) { | |
479 | pr_cont("*Could not set filter* "); | |
480 | goto out; | |
481 | } | |
482 | ||
483 | ret = register_ftrace_function(&test_rec_probe); | |
484 | if (ret) { | |
485 | pr_cont("*could not register callback* "); | |
486 | goto out; | |
487 | } | |
488 | ||
489 | DYN_FTRACE_TEST_NAME(); | |
490 | ||
491 | unregister_ftrace_function(&test_rec_probe); | |
492 | ||
493 | ret = -1; | |
494 | if (trace_selftest_recursion_cnt != 1) { | |
495 | pr_cont("*callback not called once (%d)* ", | |
496 | trace_selftest_recursion_cnt); | |
497 | goto out; | |
498 | } | |
499 | ||
500 | trace_selftest_recursion_cnt = 1; | |
501 | ||
502 | pr_cont("PASSED\n"); | |
503 | pr_info("Testing ftrace recursion safe: "); | |
504 | ||
505 | ret = ftrace_set_filter(&test_recsafe_probe, func_name, len, 1); | |
506 | if (ret) { | |
507 | pr_cont("*Could not set filter* "); | |
508 | goto out; | |
509 | } | |
510 | ||
511 | ret = register_ftrace_function(&test_recsafe_probe); | |
512 | if (ret) { | |
513 | pr_cont("*could not register callback* "); | |
514 | goto out; | |
515 | } | |
516 | ||
517 | DYN_FTRACE_TEST_NAME(); | |
518 | ||
519 | unregister_ftrace_function(&test_recsafe_probe); | |
520 | ||
ea701f11 | 521 | ret = -1; |
05cbbf64 SR |
522 | if (trace_selftest_recursion_cnt != 2) { |
523 | pr_cont("*callback not called expected 2 times (%d)* ", | |
524 | trace_selftest_recursion_cnt); | |
ea701f11 SR |
525 | goto out; |
526 | } | |
527 | ||
528 | ret = 0; | |
529 | out: | |
530 | ftrace_enabled = save_ftrace_enabled; | |
ea701f11 SR |
531 | |
532 | return ret; | |
533 | } | |
77a2b37d SR |
534 | #else |
535 | # define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; }) | |
ea701f11 | 536 | # define trace_selftest_function_recursion() ({ 0; }) |
77a2b37d | 537 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
e9a22d1f | 538 | |
ad97772a SR |
539 | static enum { |
540 | TRACE_SELFTEST_REGS_START, | |
541 | TRACE_SELFTEST_REGS_FOUND, | |
542 | TRACE_SELFTEST_REGS_NOT_FOUND, | |
543 | } trace_selftest_regs_stat; | |
544 | ||
545 | static void trace_selftest_test_regs_func(unsigned long ip, | |
546 | unsigned long pip, | |
547 | struct ftrace_ops *op, | |
548 | struct pt_regs *pt_regs) | |
549 | { | |
550 | if (pt_regs) | |
551 | trace_selftest_regs_stat = TRACE_SELFTEST_REGS_FOUND; | |
552 | else | |
553 | trace_selftest_regs_stat = TRACE_SELFTEST_REGS_NOT_FOUND; | |
554 | } | |
555 | ||
556 | static struct ftrace_ops test_regs_probe = { | |
557 | .func = trace_selftest_test_regs_func, | |
558 | .flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_SAVE_REGS, | |
559 | }; | |
560 | ||
561 | static int | |
562 | trace_selftest_function_regs(void) | |
563 | { | |
564 | int save_ftrace_enabled = ftrace_enabled; | |
ad97772a SR |
565 | char *func_name; |
566 | int len; | |
567 | int ret; | |
568 | int supported = 0; | |
569 | ||
06aeaaea | 570 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
ad97772a SR |
571 | supported = 1; |
572 | #endif | |
573 | ||
574 | /* The previous test PASSED */ | |
575 | pr_cont("PASSED\n"); | |
576 | pr_info("Testing ftrace regs%s: ", | |
577 | !supported ? "(no arch support)" : ""); | |
578 | ||
579 | /* enable tracing, and record the filter function */ | |
580 | ftrace_enabled = 1; | |
ad97772a SR |
581 | |
582 | /* Handle PPC64 '.' name */ | |
583 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); | |
584 | len = strlen(func_name); | |
585 | ||
586 | ret = ftrace_set_filter(&test_regs_probe, func_name, len, 1); | |
587 | /* | |
588 | * If DYNAMIC_FTRACE is not set, then we just trace all functions. | |
589 | * This test really doesn't care. | |
590 | */ | |
591 | if (ret && ret != -ENODEV) { | |
592 | pr_cont("*Could not set filter* "); | |
593 | goto out; | |
594 | } | |
595 | ||
596 | ret = register_ftrace_function(&test_regs_probe); | |
597 | /* | |
598 | * Now if the arch does not support passing regs, then this should | |
599 | * have failed. | |
600 | */ | |
601 | if (!supported) { | |
602 | if (!ret) { | |
603 | pr_cont("*registered save-regs without arch support* "); | |
604 | goto out; | |
605 | } | |
606 | test_regs_probe.flags |= FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED; | |
607 | ret = register_ftrace_function(&test_regs_probe); | |
608 | } | |
609 | if (ret) { | |
610 | pr_cont("*could not register callback* "); | |
611 | goto out; | |
612 | } | |
613 | ||
614 | ||
615 | DYN_FTRACE_TEST_NAME(); | |
616 | ||
617 | unregister_ftrace_function(&test_regs_probe); | |
618 | ||
619 | ret = -1; | |
620 | ||
621 | switch (trace_selftest_regs_stat) { | |
622 | case TRACE_SELFTEST_REGS_START: | |
623 | pr_cont("*callback never called* "); | |
624 | goto out; | |
625 | ||
626 | case TRACE_SELFTEST_REGS_FOUND: | |
627 | if (supported) | |
628 | break; | |
629 | pr_cont("*callback received regs without arch support* "); | |
630 | goto out; | |
631 | ||
632 | case TRACE_SELFTEST_REGS_NOT_FOUND: | |
633 | if (!supported) | |
634 | break; | |
635 | pr_cont("*callback received NULL regs* "); | |
636 | goto out; | |
637 | } | |
638 | ||
639 | ret = 0; | |
640 | out: | |
641 | ftrace_enabled = save_ftrace_enabled; | |
ad97772a SR |
642 | |
643 | return ret; | |
644 | } | |
645 | ||
60a11774 SR |
646 | /* |
647 | * Simple verification test of ftrace function tracer. | |
648 | * Enable ftrace, sleep 1/10 second, and then read the trace | |
649 | * buffer to see if all is in order. | |
650 | */ | |
f1ed7c74 | 651 | __init int |
60a11774 SR |
652 | trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr) |
653 | { | |
77a2b37d | 654 | int save_ftrace_enabled = ftrace_enabled; |
dd0e545f SR |
655 | unsigned long count; |
656 | int ret; | |
60a11774 | 657 | |
f1ed7c74 SRRH |
658 | #ifdef CONFIG_DYNAMIC_FTRACE |
659 | if (ftrace_filter_param) { | |
660 | printk(KERN_CONT " ... kernel command line filter set: force PASS ... "); | |
661 | return 0; | |
662 | } | |
663 | #endif | |
664 | ||
77a2b37d SR |
665 | /* make sure msleep has been recorded */ |
666 | msleep(1); | |
667 | ||
60a11774 | 668 | /* start the tracing */ |
c7aafc54 IM |
669 | ftrace_enabled = 1; |
670 | ||
b6f11df2 | 671 | ret = tracer_init(trace, tr); |
1c80025a FW |
672 | if (ret) { |
673 | warn_failed_init_tracer(trace, ret); | |
674 | goto out; | |
675 | } | |
676 | ||
60a11774 SR |
677 | /* Sleep for a 1/10 of a second */ |
678 | msleep(100); | |
679 | /* stop the tracing. */ | |
bbf5b1a0 | 680 | tracing_stop(); |
c7aafc54 IM |
681 | ftrace_enabled = 0; |
682 | ||
60a11774 | 683 | /* check the trace buffer */ |
12883efb | 684 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
3ddee63a SRRH |
685 | |
686 | ftrace_enabled = 1; | |
60a11774 | 687 | trace->reset(tr); |
bbf5b1a0 | 688 | tracing_start(); |
60a11774 SR |
689 | |
690 | if (!ret && !count) { | |
691 | printk(KERN_CONT ".. no entries found .."); | |
692 | ret = -1; | |
77a2b37d | 693 | goto out; |
60a11774 SR |
694 | } |
695 | ||
77a2b37d SR |
696 | ret = trace_selftest_startup_dynamic_tracing(trace, tr, |
697 | DYN_FTRACE_TEST_NAME); | |
ea701f11 SR |
698 | if (ret) |
699 | goto out; | |
77a2b37d | 700 | |
ea701f11 | 701 | ret = trace_selftest_function_recursion(); |
ad97772a SR |
702 | if (ret) |
703 | goto out; | |
704 | ||
705 | ret = trace_selftest_function_regs(); | |
77a2b37d SR |
706 | out: |
707 | ftrace_enabled = save_ftrace_enabled; | |
77a2b37d | 708 | |
4eebcc81 SR |
709 | /* kill ftrace totally if we failed */ |
710 | if (ret) | |
711 | ftrace_kill(); | |
712 | ||
60a11774 SR |
713 | return ret; |
714 | } | |
606576ce | 715 | #endif /* CONFIG_FUNCTION_TRACER */ |
60a11774 | 716 | |
7447dce9 FW |
717 | |
718 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
cf586b61 FW |
719 | |
720 | /* Maximum number of functions to trace before diagnosing a hang */ | |
721 | #define GRAPH_MAX_FUNC_TEST 100000000 | |
722 | ||
cf586b61 FW |
723 | static unsigned int graph_hang_thresh; |
724 | ||
725 | /* Wrap the real function entry probe to avoid possible hanging */ | |
726 | static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace) | |
727 | { | |
728 | /* This is harmlessly racy, we want to approximately detect a hang */ | |
729 | if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) { | |
730 | ftrace_graph_stop(); | |
731 | printk(KERN_WARNING "BUG: Function graph tracer hang!\n"); | |
7fe70b57 SRRH |
732 | if (ftrace_dump_on_oops) { |
733 | ftrace_dump(DUMP_ALL); | |
734 | /* ftrace_dump() disables tracing */ | |
735 | tracing_on(); | |
736 | } | |
cf586b61 FW |
737 | return 0; |
738 | } | |
739 | ||
740 | return trace_graph_entry(trace); | |
741 | } | |
742 | ||
7447dce9 FW |
743 | /* |
744 | * Pretty much the same than for the function tracer from which the selftest | |
745 | * has been borrowed. | |
746 | */ | |
f1ed7c74 | 747 | __init int |
7447dce9 FW |
748 | trace_selftest_startup_function_graph(struct tracer *trace, |
749 | struct trace_array *tr) | |
750 | { | |
751 | int ret; | |
752 | unsigned long count; | |
753 | ||
f1ed7c74 SRRH |
754 | #ifdef CONFIG_DYNAMIC_FTRACE |
755 | if (ftrace_filter_param) { | |
756 | printk(KERN_CONT " ... kernel command line filter set: force PASS ... "); | |
757 | return 0; | |
758 | } | |
759 | #endif | |
760 | ||
cf586b61 FW |
761 | /* |
762 | * Simulate the init() callback but we attach a watchdog callback | |
763 | * to detect and recover from possible hangs | |
764 | */ | |
12883efb | 765 | tracing_reset_online_cpus(&tr->trace_buffer); |
1a0799a8 | 766 | set_graph_array(tr); |
cf586b61 FW |
767 | ret = register_ftrace_graph(&trace_graph_return, |
768 | &trace_graph_entry_watchdog); | |
7447dce9 FW |
769 | if (ret) { |
770 | warn_failed_init_tracer(trace, ret); | |
771 | goto out; | |
772 | } | |
cf586b61 | 773 | tracing_start_cmdline_record(); |
7447dce9 FW |
774 | |
775 | /* Sleep for a 1/10 of a second */ | |
776 | msleep(100); | |
777 | ||
cf586b61 FW |
778 | /* Have we just recovered from a hang? */ |
779 | if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) { | |
0cf53ff6 | 780 | tracing_selftest_disabled = true; |
cf586b61 FW |
781 | ret = -1; |
782 | goto out; | |
783 | } | |
784 | ||
7447dce9 FW |
785 | tracing_stop(); |
786 | ||
787 | /* check the trace buffer */ | |
12883efb | 788 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
7447dce9 FW |
789 | |
790 | trace->reset(tr); | |
791 | tracing_start(); | |
792 | ||
793 | if (!ret && !count) { | |
794 | printk(KERN_CONT ".. no entries found .."); | |
795 | ret = -1; | |
796 | goto out; | |
797 | } | |
798 | ||
799 | /* Don't test dynamic tracing, the function tracer already did */ | |
800 | ||
801 | out: | |
802 | /* Stop it if we failed */ | |
803 | if (ret) | |
804 | ftrace_graph_stop(); | |
805 | ||
806 | return ret; | |
807 | } | |
808 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
809 | ||
810 | ||
60a11774 SR |
811 | #ifdef CONFIG_IRQSOFF_TRACER |
812 | int | |
813 | trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr) | |
814 | { | |
6d9b3fa5 | 815 | unsigned long save_max = tr->max_latency; |
60a11774 SR |
816 | unsigned long count; |
817 | int ret; | |
818 | ||
819 | /* start the tracing */ | |
b6f11df2 | 820 | ret = tracer_init(trace, tr); |
1c80025a FW |
821 | if (ret) { |
822 | warn_failed_init_tracer(trace, ret); | |
823 | return ret; | |
824 | } | |
825 | ||
60a11774 | 826 | /* reset the max latency */ |
6d9b3fa5 | 827 | tr->max_latency = 0; |
60a11774 SR |
828 | /* disable interrupts for a bit */ |
829 | local_irq_disable(); | |
830 | udelay(100); | |
831 | local_irq_enable(); | |
49036200 FW |
832 | |
833 | /* | |
834 | * Stop the tracer to avoid a warning subsequent | |
835 | * to buffer flipping failure because tracing_stop() | |
836 | * disables the tr and max buffers, making flipping impossible | |
837 | * in case of parallels max irqs off latencies. | |
838 | */ | |
839 | trace->stop(tr); | |
60a11774 | 840 | /* stop the tracing. */ |
bbf5b1a0 | 841 | tracing_stop(); |
60a11774 | 842 | /* check both trace buffers */ |
12883efb | 843 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 | 844 | if (!ret) |
12883efb | 845 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 | 846 | trace->reset(tr); |
bbf5b1a0 | 847 | tracing_start(); |
60a11774 SR |
848 | |
849 | if (!ret && !count) { | |
850 | printk(KERN_CONT ".. no entries found .."); | |
851 | ret = -1; | |
852 | } | |
853 | ||
6d9b3fa5 | 854 | tr->max_latency = save_max; |
60a11774 SR |
855 | |
856 | return ret; | |
857 | } | |
858 | #endif /* CONFIG_IRQSOFF_TRACER */ | |
859 | ||
860 | #ifdef CONFIG_PREEMPT_TRACER | |
861 | int | |
862 | trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr) | |
863 | { | |
6d9b3fa5 | 864 | unsigned long save_max = tr->max_latency; |
60a11774 SR |
865 | unsigned long count; |
866 | int ret; | |
867 | ||
769c48eb SR |
868 | /* |
869 | * Now that the big kernel lock is no longer preemptable, | |
870 | * and this is called with the BKL held, it will always | |
871 | * fail. If preemption is already disabled, simply | |
872 | * pass the test. When the BKL is removed, or becomes | |
873 | * preemptible again, we will once again test this, | |
874 | * so keep it in. | |
875 | */ | |
876 | if (preempt_count()) { | |
877 | printk(KERN_CONT "can not test ... force "); | |
878 | return 0; | |
879 | } | |
880 | ||
60a11774 | 881 | /* start the tracing */ |
b6f11df2 | 882 | ret = tracer_init(trace, tr); |
1c80025a FW |
883 | if (ret) { |
884 | warn_failed_init_tracer(trace, ret); | |
885 | return ret; | |
886 | } | |
887 | ||
60a11774 | 888 | /* reset the max latency */ |
6d9b3fa5 | 889 | tr->max_latency = 0; |
60a11774 SR |
890 | /* disable preemption for a bit */ |
891 | preempt_disable(); | |
892 | udelay(100); | |
893 | preempt_enable(); | |
49036200 FW |
894 | |
895 | /* | |
896 | * Stop the tracer to avoid a warning subsequent | |
897 | * to buffer flipping failure because tracing_stop() | |
898 | * disables the tr and max buffers, making flipping impossible | |
899 | * in case of parallels max preempt off latencies. | |
900 | */ | |
901 | trace->stop(tr); | |
60a11774 | 902 | /* stop the tracing. */ |
bbf5b1a0 | 903 | tracing_stop(); |
60a11774 | 904 | /* check both trace buffers */ |
12883efb | 905 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 | 906 | if (!ret) |
12883efb | 907 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 | 908 | trace->reset(tr); |
bbf5b1a0 | 909 | tracing_start(); |
60a11774 SR |
910 | |
911 | if (!ret && !count) { | |
912 | printk(KERN_CONT ".. no entries found .."); | |
913 | ret = -1; | |
914 | } | |
915 | ||
6d9b3fa5 | 916 | tr->max_latency = save_max; |
60a11774 SR |
917 | |
918 | return ret; | |
919 | } | |
920 | #endif /* CONFIG_PREEMPT_TRACER */ | |
921 | ||
922 | #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) | |
923 | int | |
924 | trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr) | |
925 | { | |
6d9b3fa5 | 926 | unsigned long save_max = tr->max_latency; |
60a11774 SR |
927 | unsigned long count; |
928 | int ret; | |
929 | ||
769c48eb SR |
930 | /* |
931 | * Now that the big kernel lock is no longer preemptable, | |
932 | * and this is called with the BKL held, it will always | |
933 | * fail. If preemption is already disabled, simply | |
934 | * pass the test. When the BKL is removed, or becomes | |
935 | * preemptible again, we will once again test this, | |
936 | * so keep it in. | |
937 | */ | |
938 | if (preempt_count()) { | |
939 | printk(KERN_CONT "can not test ... force "); | |
940 | return 0; | |
941 | } | |
942 | ||
60a11774 | 943 | /* start the tracing */ |
b6f11df2 | 944 | ret = tracer_init(trace, tr); |
1c80025a FW |
945 | if (ret) { |
946 | warn_failed_init_tracer(trace, ret); | |
ac1d52d0 | 947 | goto out_no_start; |
1c80025a | 948 | } |
60a11774 SR |
949 | |
950 | /* reset the max latency */ | |
6d9b3fa5 | 951 | tr->max_latency = 0; |
60a11774 SR |
952 | |
953 | /* disable preemption and interrupts for a bit */ | |
954 | preempt_disable(); | |
955 | local_irq_disable(); | |
956 | udelay(100); | |
957 | preempt_enable(); | |
958 | /* reverse the order of preempt vs irqs */ | |
959 | local_irq_enable(); | |
960 | ||
49036200 FW |
961 | /* |
962 | * Stop the tracer to avoid a warning subsequent | |
963 | * to buffer flipping failure because tracing_stop() | |
964 | * disables the tr and max buffers, making flipping impossible | |
965 | * in case of parallels max irqs/preempt off latencies. | |
966 | */ | |
967 | trace->stop(tr); | |
60a11774 | 968 | /* stop the tracing. */ |
bbf5b1a0 | 969 | tracing_stop(); |
60a11774 | 970 | /* check both trace buffers */ |
12883efb | 971 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
ac1d52d0 | 972 | if (ret) |
60a11774 SR |
973 | goto out; |
974 | ||
12883efb | 975 | ret = trace_test_buffer(&tr->max_buffer, &count); |
ac1d52d0 | 976 | if (ret) |
60a11774 SR |
977 | goto out; |
978 | ||
979 | if (!ret && !count) { | |
980 | printk(KERN_CONT ".. no entries found .."); | |
981 | ret = -1; | |
982 | goto out; | |
983 | } | |
984 | ||
985 | /* do the test by disabling interrupts first this time */ | |
6d9b3fa5 | 986 | tr->max_latency = 0; |
bbf5b1a0 | 987 | tracing_start(); |
49036200 FW |
988 | trace->start(tr); |
989 | ||
60a11774 SR |
990 | preempt_disable(); |
991 | local_irq_disable(); | |
992 | udelay(100); | |
993 | preempt_enable(); | |
994 | /* reverse the order of preempt vs irqs */ | |
995 | local_irq_enable(); | |
996 | ||
49036200 | 997 | trace->stop(tr); |
60a11774 | 998 | /* stop the tracing. */ |
bbf5b1a0 | 999 | tracing_stop(); |
60a11774 | 1000 | /* check both trace buffers */ |
12883efb | 1001 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 SR |
1002 | if (ret) |
1003 | goto out; | |
1004 | ||
12883efb | 1005 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 SR |
1006 | |
1007 | if (!ret && !count) { | |
1008 | printk(KERN_CONT ".. no entries found .."); | |
1009 | ret = -1; | |
1010 | goto out; | |
1011 | } | |
1012 | ||
ac1d52d0 | 1013 | out: |
bbf5b1a0 | 1014 | tracing_start(); |
ac1d52d0 FW |
1015 | out_no_start: |
1016 | trace->reset(tr); | |
6d9b3fa5 | 1017 | tr->max_latency = save_max; |
60a11774 SR |
1018 | |
1019 | return ret; | |
1020 | } | |
1021 | #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */ | |
1022 | ||
fb1b6d8b SN |
1023 | #ifdef CONFIG_NOP_TRACER |
1024 | int | |
1025 | trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr) | |
1026 | { | |
1027 | /* What could possibly go wrong? */ | |
1028 | return 0; | |
1029 | } | |
1030 | #endif | |
1031 | ||
60a11774 | 1032 | #ifdef CONFIG_SCHED_TRACER |
addff1fe SR |
1033 | |
1034 | struct wakeup_test_data { | |
1035 | struct completion is_ready; | |
1036 | int go; | |
1037 | }; | |
1038 | ||
60a11774 SR |
1039 | static int trace_wakeup_test_thread(void *data) |
1040 | { | |
af6ace76 DF |
1041 | /* Make this a -deadline thread */ |
1042 | static const struct sched_attr attr = { | |
1043 | .sched_policy = SCHED_DEADLINE, | |
1044 | .sched_runtime = 100000ULL, | |
1045 | .sched_deadline = 10000000ULL, | |
1046 | .sched_period = 10000000ULL | |
1047 | }; | |
addff1fe | 1048 | struct wakeup_test_data *x = data; |
60a11774 | 1049 | |
af6ace76 | 1050 | sched_setattr(current, &attr); |
60a11774 SR |
1051 | |
1052 | /* Make it know we have a new prio */ | |
addff1fe | 1053 | complete(&x->is_ready); |
60a11774 SR |
1054 | |
1055 | /* now go to sleep and let the test wake us up */ | |
1056 | set_current_state(TASK_INTERRUPTIBLE); | |
addff1fe SR |
1057 | while (!x->go) { |
1058 | schedule(); | |
1059 | set_current_state(TASK_INTERRUPTIBLE); | |
1060 | } | |
60a11774 | 1061 | |
addff1fe SR |
1062 | complete(&x->is_ready); |
1063 | ||
1064 | set_current_state(TASK_INTERRUPTIBLE); | |
3c18c10b | 1065 | |
60a11774 SR |
1066 | /* we are awake, now wait to disappear */ |
1067 | while (!kthread_should_stop()) { | |
addff1fe SR |
1068 | schedule(); |
1069 | set_current_state(TASK_INTERRUPTIBLE); | |
60a11774 SR |
1070 | } |
1071 | ||
addff1fe SR |
1072 | __set_current_state(TASK_RUNNING); |
1073 | ||
60a11774 SR |
1074 | return 0; |
1075 | } | |
60a11774 SR |
1076 | int |
1077 | trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr) | |
1078 | { | |
6d9b3fa5 | 1079 | unsigned long save_max = tr->max_latency; |
60a11774 | 1080 | struct task_struct *p; |
addff1fe | 1081 | struct wakeup_test_data data; |
60a11774 SR |
1082 | unsigned long count; |
1083 | int ret; | |
1084 | ||
addff1fe SR |
1085 | memset(&data, 0, sizeof(data)); |
1086 | ||
1087 | init_completion(&data.is_ready); | |
60a11774 | 1088 | |
af6ace76 | 1089 | /* create a -deadline thread */ |
addff1fe | 1090 | p = kthread_run(trace_wakeup_test_thread, &data, "ftrace-test"); |
c7aafc54 | 1091 | if (IS_ERR(p)) { |
60a11774 SR |
1092 | printk(KERN_CONT "Failed to create ftrace wakeup test thread "); |
1093 | return -1; | |
1094 | } | |
1095 | ||
af6ace76 | 1096 | /* make sure the thread is running at -deadline policy */ |
addff1fe | 1097 | wait_for_completion(&data.is_ready); |
60a11774 SR |
1098 | |
1099 | /* start the tracing */ | |
b6f11df2 | 1100 | ret = tracer_init(trace, tr); |
1c80025a FW |
1101 | if (ret) { |
1102 | warn_failed_init_tracer(trace, ret); | |
1103 | return ret; | |
1104 | } | |
1105 | ||
60a11774 | 1106 | /* reset the max latency */ |
6d9b3fa5 | 1107 | tr->max_latency = 0; |
60a11774 | 1108 | |
3c18c10b SR |
1109 | while (p->on_rq) { |
1110 | /* | |
af6ace76 | 1111 | * Sleep to make sure the -deadline thread is asleep too. |
3c18c10b SR |
1112 | * On virtual machines we can't rely on timings, |
1113 | * but we want to make sure this test still works. | |
1114 | */ | |
1115 | msleep(100); | |
1116 | } | |
60a11774 | 1117 | |
addff1fe SR |
1118 | init_completion(&data.is_ready); |
1119 | ||
1120 | data.go = 1; | |
1121 | /* memory barrier is in the wake_up_process() */ | |
60a11774 SR |
1122 | |
1123 | wake_up_process(p); | |
1124 | ||
3c18c10b | 1125 | /* Wait for the task to wake up */ |
addff1fe | 1126 | wait_for_completion(&data.is_ready); |
5aa60c60 | 1127 | |
60a11774 | 1128 | /* stop the tracing. */ |
bbf5b1a0 | 1129 | tracing_stop(); |
60a11774 | 1130 | /* check both trace buffers */ |
12883efb | 1131 | ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774 | 1132 | if (!ret) |
12883efb | 1133 | ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774 SR |
1134 | |
1135 | ||
1136 | trace->reset(tr); | |
bbf5b1a0 | 1137 | tracing_start(); |
60a11774 | 1138 | |
6d9b3fa5 | 1139 | tr->max_latency = save_max; |
60a11774 SR |
1140 | |
1141 | /* kill the thread */ | |
1142 | kthread_stop(p); | |
1143 | ||
1144 | if (!ret && !count) { | |
1145 | printk(KERN_CONT ".. no entries found .."); | |
1146 | ret = -1; | |
1147 | } | |
1148 | ||
1149 | return ret; | |
1150 | } | |
1151 | #endif /* CONFIG_SCHED_TRACER */ | |
1152 | ||
1153 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER | |
1154 | int | |
1155 | trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr) | |
1156 | { | |
1157 | unsigned long count; | |
1158 | int ret; | |
1159 | ||
1160 | /* start the tracing */ | |
b6f11df2 | 1161 | ret = tracer_init(trace, tr); |
1c80025a FW |
1162 | if (ret) { |
1163 | warn_failed_init_tracer(trace, ret); | |
1164 | return ret; | |
1165 | } | |
1166 | ||
60a11774 SR |
1167 | /* Sleep for a 1/10 of a second */ |
1168 | msleep(100); | |
1169 | /* stop the tracing. */ | |
bbf5b1a0 | 1170 | tracing_stop(); |
60a11774 | 1171 | /* check the trace buffer */ |
12883efb | 1172 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
60a11774 | 1173 | trace->reset(tr); |
bbf5b1a0 | 1174 | tracing_start(); |
60a11774 SR |
1175 | |
1176 | if (!ret && !count) { | |
1177 | printk(KERN_CONT ".. no entries found .."); | |
1178 | ret = -1; | |
1179 | } | |
1180 | ||
1181 | return ret; | |
1182 | } | |
1183 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ | |
a6dd24f8 | 1184 | |
80e5ea45 SR |
1185 | #ifdef CONFIG_BRANCH_TRACER |
1186 | int | |
1187 | trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr) | |
1188 | { | |
1189 | unsigned long count; | |
1190 | int ret; | |
1191 | ||
1192 | /* start the tracing */ | |
b6f11df2 | 1193 | ret = tracer_init(trace, tr); |
1c80025a FW |
1194 | if (ret) { |
1195 | warn_failed_init_tracer(trace, ret); | |
1196 | return ret; | |
1197 | } | |
1198 | ||
80e5ea45 SR |
1199 | /* Sleep for a 1/10 of a second */ |
1200 | msleep(100); | |
1201 | /* stop the tracing. */ | |
1202 | tracing_stop(); | |
1203 | /* check the trace buffer */ | |
0184d50f | 1204 | ret = trace_test_buffer(&tr->trace_buffer, &count); |
80e5ea45 SR |
1205 | trace->reset(tr); |
1206 | tracing_start(); | |
1207 | ||
d2ef7c2f WH |
1208 | if (!ret && !count) { |
1209 | printk(KERN_CONT ".. no entries found .."); | |
1210 | ret = -1; | |
1211 | } | |
1212 | ||
80e5ea45 SR |
1213 | return ret; |
1214 | } | |
1215 | #endif /* CONFIG_BRANCH_TRACER */ | |
321bb5e1 | 1216 |