Commit | Line | Data |
---|---|---|
60a11774 SR |
1 | /* Include in trace.c */ |
2 | ||
9cc26a26 | 3 | #include <linux/stringify.h> |
60a11774 | 4 | #include <linux/kthread.h> |
c7aafc54 | 5 | #include <linux/delay.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
60a11774 | 7 | |
e309b41d | 8 | static inline int trace_valid_entry(struct trace_entry *entry) |
60a11774 SR |
9 | { |
10 | switch (entry->type) { | |
11 | case TRACE_FN: | |
12 | case TRACE_CTX: | |
57422797 | 13 | case TRACE_WAKE: |
06fa75ab | 14 | case TRACE_STACK: |
dd0e545f | 15 | case TRACE_PRINT: |
06fa75ab | 16 | case TRACE_SPECIAL: |
80e5ea45 | 17 | case TRACE_BRANCH: |
7447dce9 FW |
18 | case TRACE_GRAPH_ENT: |
19 | case TRACE_GRAPH_RET: | |
321bb5e1 | 20 | case TRACE_HW_BRANCHES: |
0722db01 | 21 | case TRACE_KSYM: |
60a11774 SR |
22 | return 1; |
23 | } | |
24 | return 0; | |
25 | } | |
26 | ||
3928a8a2 | 27 | static int trace_test_buffer_cpu(struct trace_array *tr, int cpu) |
60a11774 | 28 | { |
3928a8a2 SR |
29 | struct ring_buffer_event *event; |
30 | struct trace_entry *entry; | |
4b3e3d22 | 31 | unsigned int loops = 0; |
60a11774 | 32 | |
3928a8a2 SR |
33 | while ((event = ring_buffer_consume(tr->buffer, cpu, NULL))) { |
34 | entry = ring_buffer_event_data(event); | |
60a11774 | 35 | |
4b3e3d22 SR |
36 | /* |
37 | * The ring buffer is a size of trace_buf_size, if | |
38 | * we loop more than the size, there's something wrong | |
39 | * with the ring buffer. | |
40 | */ | |
41 | if (loops++ > trace_buf_size) { | |
42 | printk(KERN_CONT ".. bad ring buffer "); | |
43 | goto failed; | |
44 | } | |
3928a8a2 | 45 | if (!trace_valid_entry(entry)) { |
c7aafc54 | 46 | printk(KERN_CONT ".. invalid entry %d ", |
3928a8a2 | 47 | entry->type); |
60a11774 SR |
48 | goto failed; |
49 | } | |
60a11774 | 50 | } |
60a11774 SR |
51 | return 0; |
52 | ||
53 | failed: | |
08bafa0e SR |
54 | /* disable tracing */ |
55 | tracing_disabled = 1; | |
60a11774 SR |
56 | printk(KERN_CONT ".. corrupted trace buffer .. "); |
57 | return -1; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Test the trace buffer to see if all the elements | |
62 | * are still sane. | |
63 | */ | |
64 | static int trace_test_buffer(struct trace_array *tr, unsigned long *count) | |
65 | { | |
30afdcb1 SR |
66 | unsigned long flags, cnt = 0; |
67 | int cpu, ret = 0; | |
60a11774 | 68 | |
30afdcb1 | 69 | /* Don't allow flipping of max traces now */ |
d51ad7ac | 70 | local_irq_save(flags); |
0199c4e6 | 71 | arch_spin_lock(&ftrace_max_lock); |
60a11774 | 72 | |
3928a8a2 | 73 | cnt = ring_buffer_entries(tr->buffer); |
60a11774 | 74 | |
0c5119c1 SR |
75 | /* |
76 | * The trace_test_buffer_cpu runs a while loop to consume all data. | |
77 | * If the calling tracer is broken, and is constantly filling | |
78 | * the buffer, this will run forever, and hard lock the box. | |
79 | * We disable the ring buffer while we do this test to prevent | |
80 | * a hard lock up. | |
81 | */ | |
82 | tracing_off(); | |
3928a8a2 SR |
83 | for_each_possible_cpu(cpu) { |
84 | ret = trace_test_buffer_cpu(tr, cpu); | |
60a11774 SR |
85 | if (ret) |
86 | break; | |
87 | } | |
0c5119c1 | 88 | tracing_on(); |
0199c4e6 | 89 | arch_spin_unlock(&ftrace_max_lock); |
d51ad7ac | 90 | local_irq_restore(flags); |
60a11774 SR |
91 | |
92 | if (count) | |
93 | *count = cnt; | |
94 | ||
95 | return ret; | |
96 | } | |
97 | ||
1c80025a FW |
98 | static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret) |
99 | { | |
100 | printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n", | |
101 | trace->name, init_ret); | |
102 | } | |
606576ce | 103 | #ifdef CONFIG_FUNCTION_TRACER |
77a2b37d SR |
104 | |
105 | #ifdef CONFIG_DYNAMIC_FTRACE | |
106 | ||
77a2b37d SR |
107 | /* Test dynamic code modification and ftrace filters */ |
108 | int trace_selftest_startup_dynamic_tracing(struct tracer *trace, | |
109 | struct trace_array *tr, | |
110 | int (*func)(void)) | |
111 | { | |
77a2b37d SR |
112 | int save_ftrace_enabled = ftrace_enabled; |
113 | int save_tracer_enabled = tracer_enabled; | |
dd0e545f | 114 | unsigned long count; |
4e491d14 | 115 | char *func_name; |
dd0e545f | 116 | int ret; |
77a2b37d SR |
117 | |
118 | /* The ftrace test PASSED */ | |
119 | printk(KERN_CONT "PASSED\n"); | |
120 | pr_info("Testing dynamic ftrace: "); | |
121 | ||
122 | /* enable tracing, and record the filter function */ | |
123 | ftrace_enabled = 1; | |
124 | tracer_enabled = 1; | |
125 | ||
126 | /* passed in by parameter to fool gcc from optimizing */ | |
127 | func(); | |
128 | ||
4e491d14 | 129 | /* |
73d8b8bc | 130 | * Some archs *cough*PowerPC*cough* add characters to the |
4e491d14 | 131 | * start of the function names. We simply put a '*' to |
73d8b8bc | 132 | * accommodate them. |
4e491d14 | 133 | */ |
9cc26a26 | 134 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); |
4e491d14 | 135 | |
77a2b37d | 136 | /* filter only on our function */ |
4e491d14 | 137 | ftrace_set_filter(func_name, strlen(func_name), 1); |
77a2b37d SR |
138 | |
139 | /* enable tracing */ | |
b6f11df2 | 140 | ret = tracer_init(trace, tr); |
1c80025a FW |
141 | if (ret) { |
142 | warn_failed_init_tracer(trace, ret); | |
143 | goto out; | |
144 | } | |
dd0e545f | 145 | |
77a2b37d SR |
146 | /* Sleep for a 1/10 of a second */ |
147 | msleep(100); | |
148 | ||
149 | /* we should have nothing in the buffer */ | |
150 | ret = trace_test_buffer(tr, &count); | |
151 | if (ret) | |
152 | goto out; | |
153 | ||
154 | if (count) { | |
155 | ret = -1; | |
156 | printk(KERN_CONT ".. filter did not filter .. "); | |
157 | goto out; | |
158 | } | |
159 | ||
160 | /* call our function again */ | |
161 | func(); | |
162 | ||
163 | /* sleep again */ | |
164 | msleep(100); | |
165 | ||
166 | /* stop the tracing. */ | |
bbf5b1a0 | 167 | tracing_stop(); |
77a2b37d SR |
168 | ftrace_enabled = 0; |
169 | ||
170 | /* check the trace buffer */ | |
171 | ret = trace_test_buffer(tr, &count); | |
172 | trace->reset(tr); | |
bbf5b1a0 | 173 | tracing_start(); |
77a2b37d SR |
174 | |
175 | /* we should only have one item */ | |
176 | if (!ret && count != 1) { | |
06fa75ab | 177 | printk(KERN_CONT ".. filter failed count=%ld ..", count); |
77a2b37d SR |
178 | ret = -1; |
179 | goto out; | |
180 | } | |
bbf5b1a0 | 181 | |
77a2b37d SR |
182 | out: |
183 | ftrace_enabled = save_ftrace_enabled; | |
184 | tracer_enabled = save_tracer_enabled; | |
185 | ||
186 | /* Enable tracing on all functions again */ | |
187 | ftrace_set_filter(NULL, 0, 1); | |
188 | ||
189 | return ret; | |
190 | } | |
191 | #else | |
192 | # define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; }) | |
193 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
e9a22d1f | 194 | |
60a11774 SR |
195 | /* |
196 | * Simple verification test of ftrace function tracer. | |
197 | * Enable ftrace, sleep 1/10 second, and then read the trace | |
198 | * buffer to see if all is in order. | |
199 | */ | |
200 | int | |
201 | trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr) | |
202 | { | |
77a2b37d SR |
203 | int save_ftrace_enabled = ftrace_enabled; |
204 | int save_tracer_enabled = tracer_enabled; | |
dd0e545f SR |
205 | unsigned long count; |
206 | int ret; | |
60a11774 | 207 | |
77a2b37d SR |
208 | /* make sure msleep has been recorded */ |
209 | msleep(1); | |
210 | ||
60a11774 | 211 | /* start the tracing */ |
c7aafc54 | 212 | ftrace_enabled = 1; |
77a2b37d | 213 | tracer_enabled = 1; |
c7aafc54 | 214 | |
b6f11df2 | 215 | ret = tracer_init(trace, tr); |
1c80025a FW |
216 | if (ret) { |
217 | warn_failed_init_tracer(trace, ret); | |
218 | goto out; | |
219 | } | |
220 | ||
60a11774 SR |
221 | /* Sleep for a 1/10 of a second */ |
222 | msleep(100); | |
223 | /* stop the tracing. */ | |
bbf5b1a0 | 224 | tracing_stop(); |
c7aafc54 IM |
225 | ftrace_enabled = 0; |
226 | ||
60a11774 SR |
227 | /* check the trace buffer */ |
228 | ret = trace_test_buffer(tr, &count); | |
229 | trace->reset(tr); | |
bbf5b1a0 | 230 | tracing_start(); |
60a11774 SR |
231 | |
232 | if (!ret && !count) { | |
233 | printk(KERN_CONT ".. no entries found .."); | |
234 | ret = -1; | |
77a2b37d | 235 | goto out; |
60a11774 SR |
236 | } |
237 | ||
77a2b37d SR |
238 | ret = trace_selftest_startup_dynamic_tracing(trace, tr, |
239 | DYN_FTRACE_TEST_NAME); | |
240 | ||
241 | out: | |
242 | ftrace_enabled = save_ftrace_enabled; | |
243 | tracer_enabled = save_tracer_enabled; | |
244 | ||
4eebcc81 SR |
245 | /* kill ftrace totally if we failed */ |
246 | if (ret) | |
247 | ftrace_kill(); | |
248 | ||
60a11774 SR |
249 | return ret; |
250 | } | |
606576ce | 251 | #endif /* CONFIG_FUNCTION_TRACER */ |
60a11774 | 252 | |
7447dce9 FW |
253 | |
254 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
cf586b61 FW |
255 | |
256 | /* Maximum number of functions to trace before diagnosing a hang */ | |
257 | #define GRAPH_MAX_FUNC_TEST 100000000 | |
258 | ||
259 | static void __ftrace_dump(bool disable_tracing); | |
260 | static unsigned int graph_hang_thresh; | |
261 | ||
262 | /* Wrap the real function entry probe to avoid possible hanging */ | |
263 | static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace) | |
264 | { | |
265 | /* This is harmlessly racy, we want to approximately detect a hang */ | |
266 | if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) { | |
267 | ftrace_graph_stop(); | |
268 | printk(KERN_WARNING "BUG: Function graph tracer hang!\n"); | |
269 | if (ftrace_dump_on_oops) | |
270 | __ftrace_dump(false); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | return trace_graph_entry(trace); | |
275 | } | |
276 | ||
7447dce9 FW |
277 | /* |
278 | * Pretty much the same than for the function tracer from which the selftest | |
279 | * has been borrowed. | |
280 | */ | |
281 | int | |
282 | trace_selftest_startup_function_graph(struct tracer *trace, | |
283 | struct trace_array *tr) | |
284 | { | |
285 | int ret; | |
286 | unsigned long count; | |
287 | ||
cf586b61 FW |
288 | /* |
289 | * Simulate the init() callback but we attach a watchdog callback | |
290 | * to detect and recover from possible hangs | |
291 | */ | |
292 | tracing_reset_online_cpus(tr); | |
1a0799a8 | 293 | set_graph_array(tr); |
cf586b61 FW |
294 | ret = register_ftrace_graph(&trace_graph_return, |
295 | &trace_graph_entry_watchdog); | |
7447dce9 FW |
296 | if (ret) { |
297 | warn_failed_init_tracer(trace, ret); | |
298 | goto out; | |
299 | } | |
cf586b61 | 300 | tracing_start_cmdline_record(); |
7447dce9 FW |
301 | |
302 | /* Sleep for a 1/10 of a second */ | |
303 | msleep(100); | |
304 | ||
cf586b61 FW |
305 | /* Have we just recovered from a hang? */ |
306 | if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) { | |
0cf53ff6 | 307 | tracing_selftest_disabled = true; |
cf586b61 FW |
308 | ret = -1; |
309 | goto out; | |
310 | } | |
311 | ||
7447dce9 FW |
312 | tracing_stop(); |
313 | ||
314 | /* check the trace buffer */ | |
315 | ret = trace_test_buffer(tr, &count); | |
316 | ||
317 | trace->reset(tr); | |
318 | tracing_start(); | |
319 | ||
320 | if (!ret && !count) { | |
321 | printk(KERN_CONT ".. no entries found .."); | |
322 | ret = -1; | |
323 | goto out; | |
324 | } | |
325 | ||
326 | /* Don't test dynamic tracing, the function tracer already did */ | |
327 | ||
328 | out: | |
329 | /* Stop it if we failed */ | |
330 | if (ret) | |
331 | ftrace_graph_stop(); | |
332 | ||
333 | return ret; | |
334 | } | |
335 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
336 | ||
337 | ||
60a11774 SR |
338 | #ifdef CONFIG_IRQSOFF_TRACER |
339 | int | |
340 | trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr) | |
341 | { | |
342 | unsigned long save_max = tracing_max_latency; | |
343 | unsigned long count; | |
344 | int ret; | |
345 | ||
346 | /* start the tracing */ | |
b6f11df2 | 347 | ret = tracer_init(trace, tr); |
1c80025a FW |
348 | if (ret) { |
349 | warn_failed_init_tracer(trace, ret); | |
350 | return ret; | |
351 | } | |
352 | ||
60a11774 SR |
353 | /* reset the max latency */ |
354 | tracing_max_latency = 0; | |
355 | /* disable interrupts for a bit */ | |
356 | local_irq_disable(); | |
357 | udelay(100); | |
358 | local_irq_enable(); | |
49036200 FW |
359 | |
360 | /* | |
361 | * Stop the tracer to avoid a warning subsequent | |
362 | * to buffer flipping failure because tracing_stop() | |
363 | * disables the tr and max buffers, making flipping impossible | |
364 | * in case of parallels max irqs off latencies. | |
365 | */ | |
366 | trace->stop(tr); | |
60a11774 | 367 | /* stop the tracing. */ |
bbf5b1a0 | 368 | tracing_stop(); |
60a11774 SR |
369 | /* check both trace buffers */ |
370 | ret = trace_test_buffer(tr, NULL); | |
371 | if (!ret) | |
372 | ret = trace_test_buffer(&max_tr, &count); | |
373 | trace->reset(tr); | |
bbf5b1a0 | 374 | tracing_start(); |
60a11774 SR |
375 | |
376 | if (!ret && !count) { | |
377 | printk(KERN_CONT ".. no entries found .."); | |
378 | ret = -1; | |
379 | } | |
380 | ||
381 | tracing_max_latency = save_max; | |
382 | ||
383 | return ret; | |
384 | } | |
385 | #endif /* CONFIG_IRQSOFF_TRACER */ | |
386 | ||
387 | #ifdef CONFIG_PREEMPT_TRACER | |
388 | int | |
389 | trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr) | |
390 | { | |
391 | unsigned long save_max = tracing_max_latency; | |
392 | unsigned long count; | |
393 | int ret; | |
394 | ||
769c48eb SR |
395 | /* |
396 | * Now that the big kernel lock is no longer preemptable, | |
397 | * and this is called with the BKL held, it will always | |
398 | * fail. If preemption is already disabled, simply | |
399 | * pass the test. When the BKL is removed, or becomes | |
400 | * preemptible again, we will once again test this, | |
401 | * so keep it in. | |
402 | */ | |
403 | if (preempt_count()) { | |
404 | printk(KERN_CONT "can not test ... force "); | |
405 | return 0; | |
406 | } | |
407 | ||
60a11774 | 408 | /* start the tracing */ |
b6f11df2 | 409 | ret = tracer_init(trace, tr); |
1c80025a FW |
410 | if (ret) { |
411 | warn_failed_init_tracer(trace, ret); | |
412 | return ret; | |
413 | } | |
414 | ||
60a11774 SR |
415 | /* reset the max latency */ |
416 | tracing_max_latency = 0; | |
417 | /* disable preemption for a bit */ | |
418 | preempt_disable(); | |
419 | udelay(100); | |
420 | preempt_enable(); | |
49036200 FW |
421 | |
422 | /* | |
423 | * Stop the tracer to avoid a warning subsequent | |
424 | * to buffer flipping failure because tracing_stop() | |
425 | * disables the tr and max buffers, making flipping impossible | |
426 | * in case of parallels max preempt off latencies. | |
427 | */ | |
428 | trace->stop(tr); | |
60a11774 | 429 | /* stop the tracing. */ |
bbf5b1a0 | 430 | tracing_stop(); |
60a11774 SR |
431 | /* check both trace buffers */ |
432 | ret = trace_test_buffer(tr, NULL); | |
433 | if (!ret) | |
434 | ret = trace_test_buffer(&max_tr, &count); | |
435 | trace->reset(tr); | |
bbf5b1a0 | 436 | tracing_start(); |
60a11774 SR |
437 | |
438 | if (!ret && !count) { | |
439 | printk(KERN_CONT ".. no entries found .."); | |
440 | ret = -1; | |
441 | } | |
442 | ||
443 | tracing_max_latency = save_max; | |
444 | ||
445 | return ret; | |
446 | } | |
447 | #endif /* CONFIG_PREEMPT_TRACER */ | |
448 | ||
449 | #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) | |
450 | int | |
451 | trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr) | |
452 | { | |
453 | unsigned long save_max = tracing_max_latency; | |
454 | unsigned long count; | |
455 | int ret; | |
456 | ||
769c48eb SR |
457 | /* |
458 | * Now that the big kernel lock is no longer preemptable, | |
459 | * and this is called with the BKL held, it will always | |
460 | * fail. If preemption is already disabled, simply | |
461 | * pass the test. When the BKL is removed, or becomes | |
462 | * preemptible again, we will once again test this, | |
463 | * so keep it in. | |
464 | */ | |
465 | if (preempt_count()) { | |
466 | printk(KERN_CONT "can not test ... force "); | |
467 | return 0; | |
468 | } | |
469 | ||
60a11774 | 470 | /* start the tracing */ |
b6f11df2 | 471 | ret = tracer_init(trace, tr); |
1c80025a FW |
472 | if (ret) { |
473 | warn_failed_init_tracer(trace, ret); | |
ac1d52d0 | 474 | goto out_no_start; |
1c80025a | 475 | } |
60a11774 SR |
476 | |
477 | /* reset the max latency */ | |
478 | tracing_max_latency = 0; | |
479 | ||
480 | /* disable preemption and interrupts for a bit */ | |
481 | preempt_disable(); | |
482 | local_irq_disable(); | |
483 | udelay(100); | |
484 | preempt_enable(); | |
485 | /* reverse the order of preempt vs irqs */ | |
486 | local_irq_enable(); | |
487 | ||
49036200 FW |
488 | /* |
489 | * Stop the tracer to avoid a warning subsequent | |
490 | * to buffer flipping failure because tracing_stop() | |
491 | * disables the tr and max buffers, making flipping impossible | |
492 | * in case of parallels max irqs/preempt off latencies. | |
493 | */ | |
494 | trace->stop(tr); | |
60a11774 | 495 | /* stop the tracing. */ |
bbf5b1a0 | 496 | tracing_stop(); |
60a11774 SR |
497 | /* check both trace buffers */ |
498 | ret = trace_test_buffer(tr, NULL); | |
ac1d52d0 | 499 | if (ret) |
60a11774 SR |
500 | goto out; |
501 | ||
502 | ret = trace_test_buffer(&max_tr, &count); | |
ac1d52d0 | 503 | if (ret) |
60a11774 SR |
504 | goto out; |
505 | ||
506 | if (!ret && !count) { | |
507 | printk(KERN_CONT ".. no entries found .."); | |
508 | ret = -1; | |
509 | goto out; | |
510 | } | |
511 | ||
512 | /* do the test by disabling interrupts first this time */ | |
513 | tracing_max_latency = 0; | |
bbf5b1a0 | 514 | tracing_start(); |
49036200 FW |
515 | trace->start(tr); |
516 | ||
60a11774 SR |
517 | preempt_disable(); |
518 | local_irq_disable(); | |
519 | udelay(100); | |
520 | preempt_enable(); | |
521 | /* reverse the order of preempt vs irqs */ | |
522 | local_irq_enable(); | |
523 | ||
49036200 | 524 | trace->stop(tr); |
60a11774 | 525 | /* stop the tracing. */ |
bbf5b1a0 | 526 | tracing_stop(); |
60a11774 SR |
527 | /* check both trace buffers */ |
528 | ret = trace_test_buffer(tr, NULL); | |
529 | if (ret) | |
530 | goto out; | |
531 | ||
532 | ret = trace_test_buffer(&max_tr, &count); | |
533 | ||
534 | if (!ret && !count) { | |
535 | printk(KERN_CONT ".. no entries found .."); | |
536 | ret = -1; | |
537 | goto out; | |
538 | } | |
539 | ||
ac1d52d0 | 540 | out: |
bbf5b1a0 | 541 | tracing_start(); |
ac1d52d0 FW |
542 | out_no_start: |
543 | trace->reset(tr); | |
60a11774 SR |
544 | tracing_max_latency = save_max; |
545 | ||
546 | return ret; | |
547 | } | |
548 | #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */ | |
549 | ||
fb1b6d8b SN |
550 | #ifdef CONFIG_NOP_TRACER |
551 | int | |
552 | trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr) | |
553 | { | |
554 | /* What could possibly go wrong? */ | |
555 | return 0; | |
556 | } | |
557 | #endif | |
558 | ||
60a11774 SR |
559 | #ifdef CONFIG_SCHED_TRACER |
560 | static int trace_wakeup_test_thread(void *data) | |
561 | { | |
60a11774 | 562 | /* Make this a RT thread, doesn't need to be too high */ |
05bd68c5 SR |
563 | struct sched_param param = { .sched_priority = 5 }; |
564 | struct completion *x = data; | |
60a11774 | 565 | |
05bd68c5 | 566 | sched_setscheduler(current, SCHED_FIFO, ¶m); |
60a11774 SR |
567 | |
568 | /* Make it know we have a new prio */ | |
569 | complete(x); | |
570 | ||
571 | /* now go to sleep and let the test wake us up */ | |
572 | set_current_state(TASK_INTERRUPTIBLE); | |
573 | schedule(); | |
574 | ||
575 | /* we are awake, now wait to disappear */ | |
576 | while (!kthread_should_stop()) { | |
577 | /* | |
578 | * This is an RT task, do short sleeps to let | |
579 | * others run. | |
580 | */ | |
581 | msleep(100); | |
582 | } | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | int | |
588 | trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr) | |
589 | { | |
590 | unsigned long save_max = tracing_max_latency; | |
591 | struct task_struct *p; | |
592 | struct completion isrt; | |
593 | unsigned long count; | |
594 | int ret; | |
595 | ||
596 | init_completion(&isrt); | |
597 | ||
598 | /* create a high prio thread */ | |
599 | p = kthread_run(trace_wakeup_test_thread, &isrt, "ftrace-test"); | |
c7aafc54 | 600 | if (IS_ERR(p)) { |
60a11774 SR |
601 | printk(KERN_CONT "Failed to create ftrace wakeup test thread "); |
602 | return -1; | |
603 | } | |
604 | ||
605 | /* make sure the thread is running at an RT prio */ | |
606 | wait_for_completion(&isrt); | |
607 | ||
608 | /* start the tracing */ | |
b6f11df2 | 609 | ret = tracer_init(trace, tr); |
1c80025a FW |
610 | if (ret) { |
611 | warn_failed_init_tracer(trace, ret); | |
612 | return ret; | |
613 | } | |
614 | ||
60a11774 SR |
615 | /* reset the max latency */ |
616 | tracing_max_latency = 0; | |
617 | ||
618 | /* sleep to let the RT thread sleep too */ | |
619 | msleep(100); | |
620 | ||
621 | /* | |
622 | * Yes this is slightly racy. It is possible that for some | |
623 | * strange reason that the RT thread we created, did not | |
624 | * call schedule for 100ms after doing the completion, | |
625 | * and we do a wakeup on a task that already is awake. | |
626 | * But that is extremely unlikely, and the worst thing that | |
627 | * happens in such a case, is that we disable tracing. | |
628 | * Honestly, if this race does happen something is horrible | |
629 | * wrong with the system. | |
630 | */ | |
631 | ||
632 | wake_up_process(p); | |
633 | ||
5aa60c60 SR |
634 | /* give a little time to let the thread wake up */ |
635 | msleep(100); | |
636 | ||
60a11774 | 637 | /* stop the tracing. */ |
bbf5b1a0 | 638 | tracing_stop(); |
60a11774 SR |
639 | /* check both trace buffers */ |
640 | ret = trace_test_buffer(tr, NULL); | |
641 | if (!ret) | |
642 | ret = trace_test_buffer(&max_tr, &count); | |
643 | ||
644 | ||
645 | trace->reset(tr); | |
bbf5b1a0 | 646 | tracing_start(); |
60a11774 SR |
647 | |
648 | tracing_max_latency = save_max; | |
649 | ||
650 | /* kill the thread */ | |
651 | kthread_stop(p); | |
652 | ||
653 | if (!ret && !count) { | |
654 | printk(KERN_CONT ".. no entries found .."); | |
655 | ret = -1; | |
656 | } | |
657 | ||
658 | return ret; | |
659 | } | |
660 | #endif /* CONFIG_SCHED_TRACER */ | |
661 | ||
662 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER | |
663 | int | |
664 | trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr) | |
665 | { | |
666 | unsigned long count; | |
667 | int ret; | |
668 | ||
669 | /* start the tracing */ | |
b6f11df2 | 670 | ret = tracer_init(trace, tr); |
1c80025a FW |
671 | if (ret) { |
672 | warn_failed_init_tracer(trace, ret); | |
673 | return ret; | |
674 | } | |
675 | ||
60a11774 SR |
676 | /* Sleep for a 1/10 of a second */ |
677 | msleep(100); | |
678 | /* stop the tracing. */ | |
bbf5b1a0 | 679 | tracing_stop(); |
60a11774 SR |
680 | /* check the trace buffer */ |
681 | ret = trace_test_buffer(tr, &count); | |
682 | trace->reset(tr); | |
bbf5b1a0 | 683 | tracing_start(); |
60a11774 SR |
684 | |
685 | if (!ret && !count) { | |
686 | printk(KERN_CONT ".. no entries found .."); | |
687 | ret = -1; | |
688 | } | |
689 | ||
690 | return ret; | |
691 | } | |
692 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ | |
a6dd24f8 IM |
693 | |
694 | #ifdef CONFIG_SYSPROF_TRACER | |
695 | int | |
696 | trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr) | |
697 | { | |
698 | unsigned long count; | |
699 | int ret; | |
700 | ||
701 | /* start the tracing */ | |
b6f11df2 | 702 | ret = tracer_init(trace, tr); |
1c80025a FW |
703 | if (ret) { |
704 | warn_failed_init_tracer(trace, ret); | |
d2ef7c2f | 705 | return ret; |
1c80025a FW |
706 | } |
707 | ||
a6dd24f8 IM |
708 | /* Sleep for a 1/10 of a second */ |
709 | msleep(100); | |
710 | /* stop the tracing. */ | |
bbf5b1a0 | 711 | tracing_stop(); |
a6dd24f8 IM |
712 | /* check the trace buffer */ |
713 | ret = trace_test_buffer(tr, &count); | |
714 | trace->reset(tr); | |
bbf5b1a0 | 715 | tracing_start(); |
a6dd24f8 | 716 | |
d2ef7c2f WH |
717 | if (!ret && !count) { |
718 | printk(KERN_CONT ".. no entries found .."); | |
719 | ret = -1; | |
720 | } | |
721 | ||
a6dd24f8 IM |
722 | return ret; |
723 | } | |
724 | #endif /* CONFIG_SYSPROF_TRACER */ | |
80e5ea45 SR |
725 | |
726 | #ifdef CONFIG_BRANCH_TRACER | |
727 | int | |
728 | trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr) | |
729 | { | |
730 | unsigned long count; | |
731 | int ret; | |
732 | ||
733 | /* start the tracing */ | |
b6f11df2 | 734 | ret = tracer_init(trace, tr); |
1c80025a FW |
735 | if (ret) { |
736 | warn_failed_init_tracer(trace, ret); | |
737 | return ret; | |
738 | } | |
739 | ||
80e5ea45 SR |
740 | /* Sleep for a 1/10 of a second */ |
741 | msleep(100); | |
742 | /* stop the tracing. */ | |
743 | tracing_stop(); | |
744 | /* check the trace buffer */ | |
745 | ret = trace_test_buffer(tr, &count); | |
746 | trace->reset(tr); | |
747 | tracing_start(); | |
748 | ||
d2ef7c2f WH |
749 | if (!ret && !count) { |
750 | printk(KERN_CONT ".. no entries found .."); | |
751 | ret = -1; | |
752 | } | |
753 | ||
80e5ea45 SR |
754 | return ret; |
755 | } | |
756 | #endif /* CONFIG_BRANCH_TRACER */ | |
321bb5e1 MM |
757 | |
758 | #ifdef CONFIG_HW_BRANCH_TRACER | |
759 | int | |
760 | trace_selftest_startup_hw_branches(struct tracer *trace, | |
761 | struct trace_array *tr) | |
762 | { | |
4d657e51 | 763 | struct trace_iterator *iter; |
321bb5e1 | 764 | struct tracer tracer; |
e9a22d1f IM |
765 | unsigned long count; |
766 | int ret; | |
321bb5e1 MM |
767 | |
768 | if (!trace->open) { | |
769 | printk(KERN_CONT "missing open function..."); | |
770 | return -1; | |
771 | } | |
772 | ||
773 | ret = tracer_init(trace, tr); | |
774 | if (ret) { | |
775 | warn_failed_init_tracer(trace, ret); | |
776 | return ret; | |
777 | } | |
778 | ||
779 | /* | |
780 | * The hw-branch tracer needs to collect the trace from the various | |
781 | * cpu trace buffers - before tracing is stopped. | |
782 | */ | |
4d657e51 MM |
783 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
784 | if (!iter) | |
785 | return -ENOMEM; | |
786 | ||
321bb5e1 MM |
787 | memcpy(&tracer, trace, sizeof(tracer)); |
788 | ||
4d657e51 MM |
789 | iter->trace = &tracer; |
790 | iter->tr = tr; | |
791 | iter->pos = -1; | |
792 | mutex_init(&iter->mutex); | |
321bb5e1 | 793 | |
4d657e51 | 794 | trace->open(iter); |
321bb5e1 | 795 | |
4d657e51 MM |
796 | mutex_destroy(&iter->mutex); |
797 | kfree(iter); | |
321bb5e1 MM |
798 | |
799 | tracing_stop(); | |
800 | ||
801 | ret = trace_test_buffer(tr, &count); | |
802 | trace->reset(tr); | |
803 | tracing_start(); | |
804 | ||
805 | if (!ret && !count) { | |
806 | printk(KERN_CONT "no entries found.."); | |
807 | ret = -1; | |
808 | } | |
809 | ||
810 | return ret; | |
811 | } | |
812 | #endif /* CONFIG_HW_BRANCH_TRACER */ | |
0722db01 P |
813 | |
814 | #ifdef CONFIG_KSYM_TRACER | |
815 | static int ksym_selftest_dummy; | |
816 | ||
817 | int | |
818 | trace_selftest_startup_ksym(struct tracer *trace, struct trace_array *tr) | |
819 | { | |
820 | unsigned long count; | |
821 | int ret; | |
822 | ||
823 | /* start the tracing */ | |
824 | ret = tracer_init(trace, tr); | |
825 | if (ret) { | |
826 | warn_failed_init_tracer(trace, ret); | |
827 | return ret; | |
828 | } | |
829 | ||
830 | ksym_selftest_dummy = 0; | |
831 | /* Register the read-write tracing request */ | |
30ff21e3 LZ |
832 | |
833 | ret = process_new_ksym_entry("ksym_selftest_dummy", | |
24f1e32c | 834 | HW_BREAKPOINT_R | HW_BREAKPOINT_W, |
0722db01 P |
835 | (unsigned long)(&ksym_selftest_dummy)); |
836 | ||
837 | if (ret < 0) { | |
838 | printk(KERN_CONT "ksym_trace read-write startup test failed\n"); | |
839 | goto ret_path; | |
840 | } | |
841 | /* Perform a read and a write operation over the dummy variable to | |
842 | * trigger the tracer | |
843 | */ | |
844 | if (ksym_selftest_dummy == 0) | |
845 | ksym_selftest_dummy++; | |
846 | ||
847 | /* stop the tracing. */ | |
848 | tracing_stop(); | |
849 | /* check the trace buffer */ | |
850 | ret = trace_test_buffer(tr, &count); | |
851 | trace->reset(tr); | |
852 | tracing_start(); | |
853 | ||
854 | /* read & write operations - one each is performed on the dummy variable | |
855 | * triggering two entries in the trace buffer | |
856 | */ | |
857 | if (!ret && count != 2) { | |
858 | printk(KERN_CONT "Ksym tracer startup test failed"); | |
859 | ret = -1; | |
860 | } | |
861 | ||
862 | ret_path: | |
863 | return ret; | |
864 | } | |
865 | #endif /* CONFIG_KSYM_TRACER */ | |
866 |