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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 | |
66a8cb95 | 33 | while ((event = ring_buffer_consume(tr->buffer, cpu, NULL, NULL))) { |
3928a8a2 | 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 | ||
cecbca96 FW |
259 | static void |
260 | __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode); | |
cf586b61 FW |
261 | static unsigned int graph_hang_thresh; |
262 | ||
263 | /* Wrap the real function entry probe to avoid possible hanging */ | |
264 | static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace) | |
265 | { | |
266 | /* This is harmlessly racy, we want to approximately detect a hang */ | |
267 | if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) { | |
268 | ftrace_graph_stop(); | |
269 | printk(KERN_WARNING "BUG: Function graph tracer hang!\n"); | |
270 | if (ftrace_dump_on_oops) | |
cecbca96 | 271 | __ftrace_dump(false, DUMP_ALL); |
cf586b61 FW |
272 | return 0; |
273 | } | |
274 | ||
275 | return trace_graph_entry(trace); | |
276 | } | |
277 | ||
7447dce9 FW |
278 | /* |
279 | * Pretty much the same than for the function tracer from which the selftest | |
280 | * has been borrowed. | |
281 | */ | |
282 | int | |
283 | trace_selftest_startup_function_graph(struct tracer *trace, | |
284 | struct trace_array *tr) | |
285 | { | |
286 | int ret; | |
287 | unsigned long count; | |
288 | ||
cf586b61 FW |
289 | /* |
290 | * Simulate the init() callback but we attach a watchdog callback | |
291 | * to detect and recover from possible hangs | |
292 | */ | |
293 | tracing_reset_online_cpus(tr); | |
1a0799a8 | 294 | set_graph_array(tr); |
cf586b61 FW |
295 | ret = register_ftrace_graph(&trace_graph_return, |
296 | &trace_graph_entry_watchdog); | |
7447dce9 FW |
297 | if (ret) { |
298 | warn_failed_init_tracer(trace, ret); | |
299 | goto out; | |
300 | } | |
cf586b61 | 301 | tracing_start_cmdline_record(); |
7447dce9 FW |
302 | |
303 | /* Sleep for a 1/10 of a second */ | |
304 | msleep(100); | |
305 | ||
cf586b61 FW |
306 | /* Have we just recovered from a hang? */ |
307 | if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) { | |
0cf53ff6 | 308 | tracing_selftest_disabled = true; |
cf586b61 FW |
309 | ret = -1; |
310 | goto out; | |
311 | } | |
312 | ||
7447dce9 FW |
313 | tracing_stop(); |
314 | ||
315 | /* check the trace buffer */ | |
316 | ret = trace_test_buffer(tr, &count); | |
317 | ||
318 | trace->reset(tr); | |
319 | tracing_start(); | |
320 | ||
321 | if (!ret && !count) { | |
322 | printk(KERN_CONT ".. no entries found .."); | |
323 | ret = -1; | |
324 | goto out; | |
325 | } | |
326 | ||
327 | /* Don't test dynamic tracing, the function tracer already did */ | |
328 | ||
329 | out: | |
330 | /* Stop it if we failed */ | |
331 | if (ret) | |
332 | ftrace_graph_stop(); | |
333 | ||
334 | return ret; | |
335 | } | |
336 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
337 | ||
338 | ||
60a11774 SR |
339 | #ifdef CONFIG_IRQSOFF_TRACER |
340 | int | |
341 | trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr) | |
342 | { | |
343 | unsigned long save_max = tracing_max_latency; | |
344 | unsigned long count; | |
345 | int ret; | |
346 | ||
347 | /* start the tracing */ | |
b6f11df2 | 348 | ret = tracer_init(trace, tr); |
1c80025a FW |
349 | if (ret) { |
350 | warn_failed_init_tracer(trace, ret); | |
351 | return ret; | |
352 | } | |
353 | ||
60a11774 SR |
354 | /* reset the max latency */ |
355 | tracing_max_latency = 0; | |
356 | /* disable interrupts for a bit */ | |
357 | local_irq_disable(); | |
358 | udelay(100); | |
359 | local_irq_enable(); | |
49036200 FW |
360 | |
361 | /* | |
362 | * Stop the tracer to avoid a warning subsequent | |
363 | * to buffer flipping failure because tracing_stop() | |
364 | * disables the tr and max buffers, making flipping impossible | |
365 | * in case of parallels max irqs off latencies. | |
366 | */ | |
367 | trace->stop(tr); | |
60a11774 | 368 | /* stop the tracing. */ |
bbf5b1a0 | 369 | tracing_stop(); |
60a11774 SR |
370 | /* check both trace buffers */ |
371 | ret = trace_test_buffer(tr, NULL); | |
372 | if (!ret) | |
373 | ret = trace_test_buffer(&max_tr, &count); | |
374 | trace->reset(tr); | |
bbf5b1a0 | 375 | tracing_start(); |
60a11774 SR |
376 | |
377 | if (!ret && !count) { | |
378 | printk(KERN_CONT ".. no entries found .."); | |
379 | ret = -1; | |
380 | } | |
381 | ||
382 | tracing_max_latency = save_max; | |
383 | ||
384 | return ret; | |
385 | } | |
386 | #endif /* CONFIG_IRQSOFF_TRACER */ | |
387 | ||
388 | #ifdef CONFIG_PREEMPT_TRACER | |
389 | int | |
390 | trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr) | |
391 | { | |
392 | unsigned long save_max = tracing_max_latency; | |
393 | unsigned long count; | |
394 | int ret; | |
395 | ||
769c48eb SR |
396 | /* |
397 | * Now that the big kernel lock is no longer preemptable, | |
398 | * and this is called with the BKL held, it will always | |
399 | * fail. If preemption is already disabled, simply | |
400 | * pass the test. When the BKL is removed, or becomes | |
401 | * preemptible again, we will once again test this, | |
402 | * so keep it in. | |
403 | */ | |
404 | if (preempt_count()) { | |
405 | printk(KERN_CONT "can not test ... force "); | |
406 | return 0; | |
407 | } | |
408 | ||
60a11774 | 409 | /* start the tracing */ |
b6f11df2 | 410 | ret = tracer_init(trace, tr); |
1c80025a FW |
411 | if (ret) { |
412 | warn_failed_init_tracer(trace, ret); | |
413 | return ret; | |
414 | } | |
415 | ||
60a11774 SR |
416 | /* reset the max latency */ |
417 | tracing_max_latency = 0; | |
418 | /* disable preemption for a bit */ | |
419 | preempt_disable(); | |
420 | udelay(100); | |
421 | preempt_enable(); | |
49036200 FW |
422 | |
423 | /* | |
424 | * Stop the tracer to avoid a warning subsequent | |
425 | * to buffer flipping failure because tracing_stop() | |
426 | * disables the tr and max buffers, making flipping impossible | |
427 | * in case of parallels max preempt off latencies. | |
428 | */ | |
429 | trace->stop(tr); | |
60a11774 | 430 | /* stop the tracing. */ |
bbf5b1a0 | 431 | tracing_stop(); |
60a11774 SR |
432 | /* check both trace buffers */ |
433 | ret = trace_test_buffer(tr, NULL); | |
434 | if (!ret) | |
435 | ret = trace_test_buffer(&max_tr, &count); | |
436 | trace->reset(tr); | |
bbf5b1a0 | 437 | tracing_start(); |
60a11774 SR |
438 | |
439 | if (!ret && !count) { | |
440 | printk(KERN_CONT ".. no entries found .."); | |
441 | ret = -1; | |
442 | } | |
443 | ||
444 | tracing_max_latency = save_max; | |
445 | ||
446 | return ret; | |
447 | } | |
448 | #endif /* CONFIG_PREEMPT_TRACER */ | |
449 | ||
450 | #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) | |
451 | int | |
452 | trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr) | |
453 | { | |
454 | unsigned long save_max = tracing_max_latency; | |
455 | unsigned long count; | |
456 | int ret; | |
457 | ||
769c48eb SR |
458 | /* |
459 | * Now that the big kernel lock is no longer preemptable, | |
460 | * and this is called with the BKL held, it will always | |
461 | * fail. If preemption is already disabled, simply | |
462 | * pass the test. When the BKL is removed, or becomes | |
463 | * preemptible again, we will once again test this, | |
464 | * so keep it in. | |
465 | */ | |
466 | if (preempt_count()) { | |
467 | printk(KERN_CONT "can not test ... force "); | |
468 | return 0; | |
469 | } | |
470 | ||
60a11774 | 471 | /* start the tracing */ |
b6f11df2 | 472 | ret = tracer_init(trace, tr); |
1c80025a FW |
473 | if (ret) { |
474 | warn_failed_init_tracer(trace, ret); | |
ac1d52d0 | 475 | goto out_no_start; |
1c80025a | 476 | } |
60a11774 SR |
477 | |
478 | /* reset the max latency */ | |
479 | tracing_max_latency = 0; | |
480 | ||
481 | /* disable preemption and interrupts for a bit */ | |
482 | preempt_disable(); | |
483 | local_irq_disable(); | |
484 | udelay(100); | |
485 | preempt_enable(); | |
486 | /* reverse the order of preempt vs irqs */ | |
487 | local_irq_enable(); | |
488 | ||
49036200 FW |
489 | /* |
490 | * Stop the tracer to avoid a warning subsequent | |
491 | * to buffer flipping failure because tracing_stop() | |
492 | * disables the tr and max buffers, making flipping impossible | |
493 | * in case of parallels max irqs/preempt off latencies. | |
494 | */ | |
495 | trace->stop(tr); | |
60a11774 | 496 | /* stop the tracing. */ |
bbf5b1a0 | 497 | tracing_stop(); |
60a11774 SR |
498 | /* check both trace buffers */ |
499 | ret = trace_test_buffer(tr, NULL); | |
ac1d52d0 | 500 | if (ret) |
60a11774 SR |
501 | goto out; |
502 | ||
503 | ret = trace_test_buffer(&max_tr, &count); | |
ac1d52d0 | 504 | if (ret) |
60a11774 SR |
505 | goto out; |
506 | ||
507 | if (!ret && !count) { | |
508 | printk(KERN_CONT ".. no entries found .."); | |
509 | ret = -1; | |
510 | goto out; | |
511 | } | |
512 | ||
513 | /* do the test by disabling interrupts first this time */ | |
514 | tracing_max_latency = 0; | |
bbf5b1a0 | 515 | tracing_start(); |
49036200 FW |
516 | trace->start(tr); |
517 | ||
60a11774 SR |
518 | preempt_disable(); |
519 | local_irq_disable(); | |
520 | udelay(100); | |
521 | preempt_enable(); | |
522 | /* reverse the order of preempt vs irqs */ | |
523 | local_irq_enable(); | |
524 | ||
49036200 | 525 | trace->stop(tr); |
60a11774 | 526 | /* stop the tracing. */ |
bbf5b1a0 | 527 | tracing_stop(); |
60a11774 SR |
528 | /* check both trace buffers */ |
529 | ret = trace_test_buffer(tr, NULL); | |
530 | if (ret) | |
531 | goto out; | |
532 | ||
533 | ret = trace_test_buffer(&max_tr, &count); | |
534 | ||
535 | if (!ret && !count) { | |
536 | printk(KERN_CONT ".. no entries found .."); | |
537 | ret = -1; | |
538 | goto out; | |
539 | } | |
540 | ||
ac1d52d0 | 541 | out: |
bbf5b1a0 | 542 | tracing_start(); |
ac1d52d0 FW |
543 | out_no_start: |
544 | trace->reset(tr); | |
60a11774 SR |
545 | tracing_max_latency = save_max; |
546 | ||
547 | return ret; | |
548 | } | |
549 | #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */ | |
550 | ||
fb1b6d8b SN |
551 | #ifdef CONFIG_NOP_TRACER |
552 | int | |
553 | trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr) | |
554 | { | |
555 | /* What could possibly go wrong? */ | |
556 | return 0; | |
557 | } | |
558 | #endif | |
559 | ||
60a11774 SR |
560 | #ifdef CONFIG_SCHED_TRACER |
561 | static int trace_wakeup_test_thread(void *data) | |
562 | { | |
60a11774 | 563 | /* Make this a RT thread, doesn't need to be too high */ |
05bd68c5 SR |
564 | struct sched_param param = { .sched_priority = 5 }; |
565 | struct completion *x = data; | |
60a11774 | 566 | |
05bd68c5 | 567 | sched_setscheduler(current, SCHED_FIFO, ¶m); |
60a11774 SR |
568 | |
569 | /* Make it know we have a new prio */ | |
570 | complete(x); | |
571 | ||
572 | /* now go to sleep and let the test wake us up */ | |
573 | set_current_state(TASK_INTERRUPTIBLE); | |
574 | schedule(); | |
575 | ||
576 | /* we are awake, now wait to disappear */ | |
577 | while (!kthread_should_stop()) { | |
578 | /* | |
579 | * This is an RT task, do short sleeps to let | |
580 | * others run. | |
581 | */ | |
582 | msleep(100); | |
583 | } | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
588 | int | |
589 | trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr) | |
590 | { | |
591 | unsigned long save_max = tracing_max_latency; | |
592 | struct task_struct *p; | |
593 | struct completion isrt; | |
594 | unsigned long count; | |
595 | int ret; | |
596 | ||
597 | init_completion(&isrt); | |
598 | ||
599 | /* create a high prio thread */ | |
600 | p = kthread_run(trace_wakeup_test_thread, &isrt, "ftrace-test"); | |
c7aafc54 | 601 | if (IS_ERR(p)) { |
60a11774 SR |
602 | printk(KERN_CONT "Failed to create ftrace wakeup test thread "); |
603 | return -1; | |
604 | } | |
605 | ||
606 | /* make sure the thread is running at an RT prio */ | |
607 | wait_for_completion(&isrt); | |
608 | ||
609 | /* start the tracing */ | |
b6f11df2 | 610 | ret = tracer_init(trace, tr); |
1c80025a FW |
611 | if (ret) { |
612 | warn_failed_init_tracer(trace, ret); | |
613 | return ret; | |
614 | } | |
615 | ||
60a11774 SR |
616 | /* reset the max latency */ |
617 | tracing_max_latency = 0; | |
618 | ||
619 | /* sleep to let the RT thread sleep too */ | |
620 | msleep(100); | |
621 | ||
622 | /* | |
623 | * Yes this is slightly racy. It is possible that for some | |
624 | * strange reason that the RT thread we created, did not | |
625 | * call schedule for 100ms after doing the completion, | |
626 | * and we do a wakeup on a task that already is awake. | |
627 | * But that is extremely unlikely, and the worst thing that | |
628 | * happens in such a case, is that we disable tracing. | |
629 | * Honestly, if this race does happen something is horrible | |
630 | * wrong with the system. | |
631 | */ | |
632 | ||
633 | wake_up_process(p); | |
634 | ||
5aa60c60 SR |
635 | /* give a little time to let the thread wake up */ |
636 | msleep(100); | |
637 | ||
60a11774 | 638 | /* stop the tracing. */ |
bbf5b1a0 | 639 | tracing_stop(); |
60a11774 SR |
640 | /* check both trace buffers */ |
641 | ret = trace_test_buffer(tr, NULL); | |
642 | if (!ret) | |
643 | ret = trace_test_buffer(&max_tr, &count); | |
644 | ||
645 | ||
646 | trace->reset(tr); | |
bbf5b1a0 | 647 | tracing_start(); |
60a11774 SR |
648 | |
649 | tracing_max_latency = save_max; | |
650 | ||
651 | /* kill the thread */ | |
652 | kthread_stop(p); | |
653 | ||
654 | if (!ret && !count) { | |
655 | printk(KERN_CONT ".. no entries found .."); | |
656 | ret = -1; | |
657 | } | |
658 | ||
659 | return ret; | |
660 | } | |
661 | #endif /* CONFIG_SCHED_TRACER */ | |
662 | ||
663 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER | |
664 | int | |
665 | trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr) | |
666 | { | |
667 | unsigned long count; | |
668 | int ret; | |
669 | ||
670 | /* start the tracing */ | |
b6f11df2 | 671 | ret = tracer_init(trace, tr); |
1c80025a FW |
672 | if (ret) { |
673 | warn_failed_init_tracer(trace, ret); | |
674 | return ret; | |
675 | } | |
676 | ||
60a11774 SR |
677 | /* Sleep for a 1/10 of a second */ |
678 | msleep(100); | |
679 | /* stop the tracing. */ | |
bbf5b1a0 | 680 | tracing_stop(); |
60a11774 SR |
681 | /* check the trace buffer */ |
682 | ret = trace_test_buffer(tr, &count); | |
683 | trace->reset(tr); | |
bbf5b1a0 | 684 | tracing_start(); |
60a11774 SR |
685 | |
686 | if (!ret && !count) { | |
687 | printk(KERN_CONT ".. no entries found .."); | |
688 | ret = -1; | |
689 | } | |
690 | ||
691 | return ret; | |
692 | } | |
693 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ | |
a6dd24f8 IM |
694 | |
695 | #ifdef CONFIG_SYSPROF_TRACER | |
696 | int | |
697 | trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr) | |
698 | { | |
699 | unsigned long count; | |
700 | int ret; | |
701 | ||
702 | /* start the tracing */ | |
b6f11df2 | 703 | ret = tracer_init(trace, tr); |
1c80025a FW |
704 | if (ret) { |
705 | warn_failed_init_tracer(trace, ret); | |
d2ef7c2f | 706 | return ret; |
1c80025a FW |
707 | } |
708 | ||
a6dd24f8 IM |
709 | /* Sleep for a 1/10 of a second */ |
710 | msleep(100); | |
711 | /* stop the tracing. */ | |
bbf5b1a0 | 712 | tracing_stop(); |
a6dd24f8 IM |
713 | /* check the trace buffer */ |
714 | ret = trace_test_buffer(tr, &count); | |
715 | trace->reset(tr); | |
bbf5b1a0 | 716 | tracing_start(); |
a6dd24f8 | 717 | |
d2ef7c2f WH |
718 | if (!ret && !count) { |
719 | printk(KERN_CONT ".. no entries found .."); | |
720 | ret = -1; | |
721 | } | |
722 | ||
a6dd24f8 IM |
723 | return ret; |
724 | } | |
725 | #endif /* CONFIG_SYSPROF_TRACER */ | |
80e5ea45 SR |
726 | |
727 | #ifdef CONFIG_BRANCH_TRACER | |
728 | int | |
729 | trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr) | |
730 | { | |
731 | unsigned long count; | |
732 | int ret; | |
733 | ||
734 | /* start the tracing */ | |
b6f11df2 | 735 | ret = tracer_init(trace, tr); |
1c80025a FW |
736 | if (ret) { |
737 | warn_failed_init_tracer(trace, ret); | |
738 | return ret; | |
739 | } | |
740 | ||
80e5ea45 SR |
741 | /* Sleep for a 1/10 of a second */ |
742 | msleep(100); | |
743 | /* stop the tracing. */ | |
744 | tracing_stop(); | |
745 | /* check the trace buffer */ | |
746 | ret = trace_test_buffer(tr, &count); | |
747 | trace->reset(tr); | |
748 | tracing_start(); | |
749 | ||
d2ef7c2f WH |
750 | if (!ret && !count) { |
751 | printk(KERN_CONT ".. no entries found .."); | |
752 | ret = -1; | |
753 | } | |
754 | ||
80e5ea45 SR |
755 | return ret; |
756 | } | |
757 | #endif /* CONFIG_BRANCH_TRACER */ | |
321bb5e1 MM |
758 | |
759 | #ifdef CONFIG_HW_BRANCH_TRACER | |
760 | int | |
761 | trace_selftest_startup_hw_branches(struct tracer *trace, | |
762 | struct trace_array *tr) | |
763 | { | |
4d657e51 | 764 | struct trace_iterator *iter; |
321bb5e1 | 765 | struct tracer tracer; |
e9a22d1f IM |
766 | unsigned long count; |
767 | int ret; | |
321bb5e1 MM |
768 | |
769 | if (!trace->open) { | |
770 | printk(KERN_CONT "missing open function..."); | |
771 | return -1; | |
772 | } | |
773 | ||
774 | ret = tracer_init(trace, tr); | |
775 | if (ret) { | |
776 | warn_failed_init_tracer(trace, ret); | |
777 | return ret; | |
778 | } | |
779 | ||
780 | /* | |
781 | * The hw-branch tracer needs to collect the trace from the various | |
782 | * cpu trace buffers - before tracing is stopped. | |
783 | */ | |
4d657e51 MM |
784 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
785 | if (!iter) | |
786 | return -ENOMEM; | |
787 | ||
321bb5e1 MM |
788 | memcpy(&tracer, trace, sizeof(tracer)); |
789 | ||
4d657e51 MM |
790 | iter->trace = &tracer; |
791 | iter->tr = tr; | |
792 | iter->pos = -1; | |
793 | mutex_init(&iter->mutex); | |
321bb5e1 | 794 | |
4d657e51 | 795 | trace->open(iter); |
321bb5e1 | 796 | |
4d657e51 MM |
797 | mutex_destroy(&iter->mutex); |
798 | kfree(iter); | |
321bb5e1 MM |
799 | |
800 | tracing_stop(); | |
801 | ||
802 | ret = trace_test_buffer(tr, &count); | |
803 | trace->reset(tr); | |
804 | tracing_start(); | |
805 | ||
806 | if (!ret && !count) { | |
807 | printk(KERN_CONT "no entries found.."); | |
808 | ret = -1; | |
809 | } | |
810 | ||
811 | return ret; | |
812 | } | |
813 | #endif /* CONFIG_HW_BRANCH_TRACER */ | |
0722db01 P |
814 | |
815 | #ifdef CONFIG_KSYM_TRACER | |
816 | static int ksym_selftest_dummy; | |
817 | ||
818 | int | |
819 | trace_selftest_startup_ksym(struct tracer *trace, struct trace_array *tr) | |
820 | { | |
821 | unsigned long count; | |
822 | int ret; | |
823 | ||
824 | /* start the tracing */ | |
825 | ret = tracer_init(trace, tr); | |
826 | if (ret) { | |
827 | warn_failed_init_tracer(trace, ret); | |
828 | return ret; | |
829 | } | |
830 | ||
831 | ksym_selftest_dummy = 0; | |
832 | /* Register the read-write tracing request */ | |
30ff21e3 LZ |
833 | |
834 | ret = process_new_ksym_entry("ksym_selftest_dummy", | |
24f1e32c | 835 | HW_BREAKPOINT_R | HW_BREAKPOINT_W, |
0722db01 P |
836 | (unsigned long)(&ksym_selftest_dummy)); |
837 | ||
838 | if (ret < 0) { | |
839 | printk(KERN_CONT "ksym_trace read-write startup test failed\n"); | |
840 | goto ret_path; | |
841 | } | |
842 | /* Perform a read and a write operation over the dummy variable to | |
843 | * trigger the tracer | |
844 | */ | |
845 | if (ksym_selftest_dummy == 0) | |
846 | ksym_selftest_dummy++; | |
847 | ||
848 | /* stop the tracing. */ | |
849 | tracing_stop(); | |
850 | /* check the trace buffer */ | |
851 | ret = trace_test_buffer(tr, &count); | |
852 | trace->reset(tr); | |
853 | tracing_start(); | |
854 | ||
855 | /* read & write operations - one each is performed on the dummy variable | |
856 | * triggering two entries in the trace buffer | |
857 | */ | |
858 | if (!ret && count != 2) { | |
859 | printk(KERN_CONT "Ksym tracer startup test failed"); | |
860 | ret = -1; | |
861 | } | |
862 | ||
863 | ret_path: | |
864 | return ret; | |
865 | } | |
866 | #endif /* CONFIG_KSYM_TRACER */ | |
867 |