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