summaryrefslogtreecommitdiff
path: root/lib/kunit/test.c
blob: f95d2093a0aa3359c0cb08462ea62e76ab0f2ecf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
// SPDX-License-Identifier: GPL-2.0
/*
 * Base unit test (KUnit) API.
 *
 * Copyright (C) 2019, Google LLC.
 * Author: Brendan Higgins <brendanhiggins@google.com>
 */

#include <kunit/resource.h>
#include <kunit/test.h>
#include <kunit/test-bug.h>
#include <kunit/attributes.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/panic.h>
#include <linux/sched/debug.h>
#include <linux/sched.h>

#include "debugfs.h"
#include "device-impl.h"
#include "hooks-impl.h"
#include "string-stream.h"
#include "try-catch-impl.h"

static DEFINE_MUTEX(kunit_run_lock);

/*
 * Hook to fail the current test and print an error message to the log.
 */
void __printf(3, 4) __kunit_fail_current_test_impl(const char *file, int line, const char *fmt, ...)
{
	va_list args;
	int len;
	char *buffer;

	if (!current->kunit_test)
		return;

	kunit_set_failure(current->kunit_test);

	/* kunit_err() only accepts literals, so evaluate the args first. */
	va_start(args, fmt);
	len = vsnprintf(NULL, 0, fmt, args) + 1;
	va_end(args);

	buffer = kunit_kmalloc(current->kunit_test, len, GFP_KERNEL);
	if (!buffer)
		return;

	va_start(args, fmt);
	vsnprintf(buffer, len, fmt, args);
	va_end(args);

	kunit_err(current->kunit_test, "%s:%d: %s", file, line, buffer);
	kunit_kfree(current->kunit_test, buffer);
}

/*
 * Enable KUnit tests to run.
 */
#ifdef CONFIG_KUNIT_DEFAULT_ENABLED
static bool enable_param = true;
#else
static bool enable_param;
#endif
module_param_named(enable, enable_param, bool, 0);
MODULE_PARM_DESC(enable, "Enable KUnit tests");

/*
 * KUnit statistic mode:
 * 0 - disabled
 * 1 - only when there is more than one subtest
 * 2 - enabled
 */
static int kunit_stats_enabled = 1;
module_param_named(stats_enabled, kunit_stats_enabled, int, 0644);
MODULE_PARM_DESC(stats_enabled,
		  "Print test stats: never (0), only for multiple subtests (1), or always (2)");

struct kunit_result_stats {
	unsigned long passed;
	unsigned long skipped;
	unsigned long failed;
	unsigned long total;
};

static bool kunit_should_print_stats(struct kunit_result_stats stats)
{
	if (kunit_stats_enabled == 0)
		return false;

	if (kunit_stats_enabled == 2)
		return true;

	return (stats.total > 1);
}

static void kunit_print_test_stats(struct kunit *test,
				   struct kunit_result_stats stats)
{
	if (!kunit_should_print_stats(stats))
		return;

	kunit_log(KERN_INFO, test,
		  KUNIT_SUBTEST_INDENT
		  "# %s: pass:%lu fail:%lu skip:%lu total:%lu",
		  test->name,
		  stats.passed,
		  stats.failed,
		  stats.skipped,
		  stats.total);
}

/* Append formatted message to log. */
void kunit_log_append(struct string_stream *log, const char *fmt, ...)
{
	va_list args;

	if (!log)
		return;

	va_start(args, fmt);
	string_stream_vadd(log, fmt, args);
	va_end(args);
}
EXPORT_SYMBOL_GPL(kunit_log_append);

size_t kunit_suite_num_test_cases(struct kunit_suite *suite)
{
	struct kunit_case *test_case;
	size_t len = 0;

	kunit_suite_for_each_test_case(suite, test_case)
		len++;

	return len;
}
EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases);

/* Currently supported test levels */
enum {
	KUNIT_LEVEL_SUITE = 0,
	KUNIT_LEVEL_CASE,
	KUNIT_LEVEL_CASE_PARAM,
};

static void kunit_print_suite_start(struct kunit_suite *suite)
{
	/*
	 * We do not log the test suite header as doing so would
	 * mean debugfs display would consist of the test suite
	 * header prior to individual test results.
	 * Hence directly printk the suite status, and we will
	 * separately seq_printf() the suite header for the debugfs
	 * representation.
	 */
	pr_info(KUNIT_SUBTEST_INDENT "KTAP version 1\n");
	pr_info(KUNIT_SUBTEST_INDENT "# Subtest: %s\n",
		  suite->name);
	kunit_print_attr((void *)suite, false, KUNIT_LEVEL_CASE);
	pr_info(KUNIT_SUBTEST_INDENT "1..%zd\n",
		  kunit_suite_num_test_cases(suite));
}

static void kunit_print_ok_not_ok(struct kunit *test,
				  unsigned int test_level,
				  enum kunit_status status,
				  size_t test_number,
				  const char *description,
				  const char *directive)
{
	const char *directive_header = (status == KUNIT_SKIPPED) ? " # SKIP " : "";
	const char *directive_body = (status == KUNIT_SKIPPED) ? directive : "";

	/*
	 * When test is NULL assume that results are from the suite
	 * and today suite results are expected at level 0 only.
	 */
	WARN(!test && test_level, "suite test level can't be %u!\n", test_level);

	/*
	 * We do not log the test suite results as doing so would
	 * mean debugfs display would consist of an incorrect test
	 * number. Hence directly printk the suite result, and we will
	 * separately seq_printf() the suite results for the debugfs
	 * representation.
	 */
	if (!test)
		pr_info("%s %zd %s%s%s\n",
			kunit_status_to_ok_not_ok(status),
			test_number, description, directive_header,
			directive_body);
	else
		kunit_log(KERN_INFO, test,
			  "%*s%s %zd %s%s%s",
			  KUNIT_INDENT_LEN * test_level, "",
			  kunit_status_to_ok_not_ok(status),
			  test_number, description, directive_header,
			  directive_body);
}

enum kunit_status kunit_suite_has_succeeded(struct kunit_suite *suite)
{
	const struct kunit_case *test_case;
	enum kunit_status status = KUNIT_SKIPPED;

	if (suite->suite_init_err)
		return KUNIT_FAILURE;

	kunit_suite_for_each_test_case(suite, test_case) {
		if (test_case->status == KUNIT_FAILURE)
			return KUNIT_FAILURE;
		else if (test_case->status == KUNIT_SUCCESS)
			status = KUNIT_SUCCESS;
	}

	return status;
}
EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded);

static size_t kunit_suite_counter = 1;

static void kunit_print_suite_end(struct kunit_suite *suite)
{
	kunit_print_ok_not_ok(NULL, KUNIT_LEVEL_SUITE,
			      kunit_suite_has_succeeded(suite),
			      kunit_suite_counter++,
			      suite->name,
			      suite->status_comment);
}

unsigned int kunit_test_case_num(struct kunit_suite *suite,
				 struct kunit_case *test_case)
{
	struct kunit_case *tc;
	unsigned int i = 1;

	kunit_suite_for_each_test_case(suite, tc) {
		if (tc == test_case)
			return i;
		i++;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(kunit_test_case_num);

static void kunit_print_string_stream(struct kunit *test,
				      struct string_stream *stream)
{
	struct string_stream_fragment *fragment;
	char *buf;

	if (string_stream_is_empty(stream))
		return;

	buf = string_stream_get_string(stream);
	if (!buf) {
		kunit_err(test,
			  "Could not allocate buffer, dumping stream:\n");
		list_for_each_entry(fragment, &stream->fragments, node) {
			kunit_err(test, "%s", fragment->fragment);
		}
		kunit_err(test, "\n");
	} else {
		kunit_err(test, "%s", buf);
		kfree(buf);
	}
}

static void kunit_fail(struct kunit *test, const struct kunit_loc *loc,
		       enum kunit_assert_type type, const struct kunit_assert *assert,
		       assert_format_t assert_format, const struct va_format *message)
{
	struct string_stream *stream;

	kunit_set_failure(test);

	stream = kunit_alloc_string_stream(test, GFP_KERNEL);
	if (IS_ERR(stream)) {
		WARN(true,
		     "Could not allocate stream to print failed assertion in %s:%d\n",
		     loc->file,
		     loc->line);
		return;
	}

	kunit_assert_prologue(loc, type, stream);
	assert_format(assert, message, stream);

	kunit_print_string_stream(test, stream);

	kunit_free_string_stream(test, stream);
}

void __noreturn __kunit_abort(struct kunit *test)
{
	kunit_try_catch_throw(&test->try_catch); /* Does not return. */

	/*
	 * Throw could not abort from test.
	 *
	 * XXX: we should never reach this line! As kunit_try_catch_throw is
	 * marked __noreturn.
	 */
	WARN_ONCE(true, "Throw could not abort from test!\n");
}
EXPORT_SYMBOL_GPL(__kunit_abort);

void __kunit_do_failed_assertion(struct kunit *test,
			       const struct kunit_loc *loc,
			       enum kunit_assert_type type,
			       const struct kunit_assert *assert,
			       assert_format_t assert_format,
			       const char *fmt, ...)
{
	va_list args;
	struct va_format message;
	va_start(args, fmt);

	message.fmt = fmt;
	message.va = &args;

	kunit_fail(test, loc, type, assert, assert_format, &message);

	va_end(args);
}
EXPORT_SYMBOL_GPL(__kunit_do_failed_assertion);

void kunit_init_test(struct kunit *test, const char *name, struct string_stream *log)
{
	spin_lock_init(&test->lock);
	INIT_LIST_HEAD(&test->resources);
	test->name = name;
	test->log = log;
	if (test->log)
		string_stream_clear(log);
	test->status = KUNIT_SUCCESS;
	test->status_comment[0] = '\0';
}
EXPORT_SYMBOL_GPL(kunit_init_test);

/* Only warn when a test takes more than twice the threshold */
#define KUNIT_SPEED_WARNING_MULTIPLIER	2

/* Slow tests are defined as taking more than 1s */
#define KUNIT_SPEED_SLOW_THRESHOLD_S	1

#define KUNIT_SPEED_SLOW_WARNING_THRESHOLD_S	\
	(KUNIT_SPEED_WARNING_MULTIPLIER * KUNIT_SPEED_SLOW_THRESHOLD_S)

#define s_to_timespec64(s) ns_to_timespec64((s) * NSEC_PER_SEC)

static void kunit_run_case_check_speed(struct kunit *test,
				       struct kunit_case *test_case,
				       struct timespec64 duration)
{
	struct timespec64 slow_thr =
		s_to_timespec64(KUNIT_SPEED_SLOW_WARNING_THRESHOLD_S);
	enum kunit_speed speed = test_case->attr.speed;

	if (timespec64_compare(&duration, &slow_thr) < 0)
		return;

	if (speed == KUNIT_SPEED_VERY_SLOW || speed == KUNIT_SPEED_SLOW)
		return;

	kunit_warn(test,
		   "Test should be marked slow (runtime: %lld.%09lds)",
		   duration.tv_sec, duration.tv_nsec);
}

/*
 * Initializes and runs test case. Does not clean up or do post validations.
 */
static void kunit_run_case_internal(struct kunit *test,
				    struct kunit_suite *suite,
				    struct kunit_case *test_case)
{
	struct timespec64 start, end;

	if (suite->init) {
		int ret;

		ret = suite->init(test);
		if (ret) {
			kunit_err(test, "failed to initialize: %d\n", ret);
			kunit_set_failure(test);
			return;
		}
	}

	ktime_get_ts64(&start);

	test_case->run_case(test);

	ktime_get_ts64(&end);

	kunit_run_case_check_speed(test, test_case, timespec64_sub(end, start));
}

static void kunit_case_internal_cleanup(struct kunit *test)
{
	kunit_cleanup(test);
}

/*
 * Performs post validations and cleanup after a test case was run.
 * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
 */
static void kunit_run_case_cleanup(struct kunit *test,
				   struct kunit_suite *suite)
{
	if (suite->exit)
		suite->exit(test);

	kunit_case_internal_cleanup(test);
}

struct kunit_try_catch_context {
	struct kunit *test;
	struct kunit_suite *suite;
	struct kunit_case *test_case;
};

static void kunit_try_run_case(void *data)
{
	struct kunit_try_catch_context *ctx = data;
	struct kunit *test = ctx->test;
	struct kunit_suite *suite = ctx->suite;
	struct kunit_case *test_case = ctx->test_case;

	current->kunit_test = test;

	/*
	 * kunit_run_case_internal may encounter a fatal error; if it does,
	 * abort will be called, this thread will exit, and finally the parent
	 * thread will resume control and handle any necessary clean up.
	 */
	kunit_run_case_internal(test, suite, test_case);
}

static void kunit_try_run_case_cleanup(void *data)
{
	struct kunit_try_catch_context *ctx = data;
	struct kunit *test = ctx->test;
	struct kunit_suite *suite = ctx->suite;

	current->kunit_test = test;

	kunit_run_case_cleanup(test, suite);
}

static void kunit_catch_run_case_cleanup(void *data)
{
	struct kunit_try_catch_context *ctx = data;
	struct kunit *test = ctx->test;
	int try_exit_code = kunit_try_catch_get_result(&test->try_catch);

	/* It is always a failure if cleanup aborts. */
	kunit_set_failure(test);

	if (try_exit_code) {
		/*
		 * Test case could not finish, we have no idea what state it is
		 * in, so don't do clean up.
		 */
		if (try_exit_code == -ETIMEDOUT) {
			kunit_err(test, "test case cleanup timed out\n");
		/*
		 * Unknown internal error occurred preventing test case from
		 * running, so there is nothing to clean up.
		 */
		} else {
			kunit_err(test, "internal error occurred during test case cleanup: %d\n",
				  try_exit_code);
		}
		return;
	}

	kunit_err(test, "test aborted during cleanup. continuing without cleaning up\n");
}


static void kunit_catch_run_case(void *data)
{
	struct kunit_try_catch_context *ctx = data;
	struct kunit *test = ctx->test;
	int try_exit_code = kunit_try_catch_get_result(&test->try_catch);

	if (try_exit_code) {
		kunit_set_failure(test);
		/*
		 * Test case could not finish, we have no idea what state it is
		 * in, so don't do clean up.
		 */
		if (try_exit_code == -ETIMEDOUT) {
			kunit_err(test, "test case timed out\n");
		/*
		 * Unknown internal error occurred preventing test case from
		 * running, so there is nothing to clean up.
		 */
		} else {
			kunit_err(test, "internal error occurred preventing test case from running: %d\n",
				  try_exit_code);
		}
		return;
	}
}

/*
 * Performs all logic to run a test case. It also catches most errors that
 * occur in a test case and reports them as failures.
 */
static void kunit_run_case_catch_errors(struct kunit_suite *suite,
					struct kunit_case *test_case,
					struct kunit *test)
{
	struct kunit_try_catch_context context;
	struct kunit_try_catch *try_catch;

	try_catch = &test->try_catch;

	kunit_try_catch_init(try_catch,
			     test,
			     kunit_try_run_case,
			     kunit_catch_run_case);
	context.test = test;
	context.suite = suite;
	context.test_case = test_case;
	kunit_try_catch_run(try_catch, &context);

	/* Now run the cleanup */
	kunit_try_catch_init(try_catch,
			     test,
			     kunit_try_run_case_cleanup,
			     kunit_catch_run_case_cleanup);
	kunit_try_catch_run(try_catch, &context);

	/* Propagate the parameter result to the test case. */
	if (test->status == KUNIT_FAILURE)
		test_case->status = KUNIT_FAILURE;
	else if (test_case->status != KUNIT_FAILURE && test->status == KUNIT_SUCCESS)
		test_case->status = KUNIT_SUCCESS;
}

static void kunit_print_suite_stats(struct kunit_suite *suite,
				    struct kunit_result_stats suite_stats,
				    struct kunit_result_stats param_stats)
{
	if (kunit_should_print_stats(suite_stats)) {
		kunit_log(KERN_INFO, suite,
			  "# %s: pass:%lu fail:%lu skip:%lu total:%lu",
			  suite->name,
			  suite_stats.passed,
			  suite_stats.failed,
			  suite_stats.skipped,
			  suite_stats.total);
	}

	if (kunit_should_print_stats(param_stats)) {
		kunit_log(KERN_INFO, suite,
			  "# Totals: pass:%lu fail:%lu skip:%lu total:%lu",
			  param_stats.passed,
			  param_stats.failed,
			  param_stats.skipped,
			  param_stats.total);
	}
}

static void kunit_update_stats(struct kunit_result_stats *stats,
			       enum kunit_status status)
{
	switch (status) {
	case KUNIT_SUCCESS:
		stats->passed++;
		break;
	case KUNIT_SKIPPED:
		stats->skipped++;
		break;
	case KUNIT_FAILURE:
		stats->failed++;
		break;
	}

	stats->total++;
}

static void kunit_accumulate_stats(struct kunit_result_stats *total,
				   struct kunit_result_stats add)
{
	total->passed += add.passed;
	total->skipped += add.skipped;
	total->failed += add.failed;
	total->total += add.total;
}

int kunit_run_tests(struct kunit_suite *suite)
{
	char param_desc[KUNIT_PARAM_DESC_SIZE];
	struct kunit_case *test_case;
	struct kunit_result_stats suite_stats = { 0 };
	struct kunit_result_stats total_stats = { 0 };

	/* Taint the kernel so we know we've run tests. */
	add_taint(TAINT_TEST, LOCKDEP_STILL_OK);

	if (suite->suite_init) {
		suite->suite_init_err = suite->suite_init(suite);
		if (suite->suite_init_err) {
			kunit_err(suite, KUNIT_SUBTEST_INDENT
				  "# failed to initialize (%d)", suite->suite_init_err);
			goto suite_end;
		}
	}

	kunit_print_suite_start(suite);

	kunit_suite_for_each_test_case(suite, test_case) {
		struct kunit test = { .param_value = NULL, .param_index = 0 };
		struct kunit_result_stats param_stats = { 0 };

		kunit_init_test(&test, test_case->name, test_case->log);
		if (test_case->status == KUNIT_SKIPPED) {
			/* Test marked as skip */
			test.status = KUNIT_SKIPPED;
			kunit_update_stats(&param_stats, test.status);
		} else if (!test_case->generate_params) {
			/* Non-parameterised test. */
			test_case->status = KUNIT_SKIPPED;
			kunit_run_case_catch_errors(suite, test_case, &test);
			kunit_update_stats(&param_stats, test.status);
		} else {
			/* Get initial param. */
			param_desc[0] = '\0';
			test.param_value = test_case->generate_params(NULL, param_desc);
			test_case->status = KUNIT_SKIPPED;
			kunit_log(KERN_INFO, &test, KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT
				  "KTAP version 1\n");
			kunit_log(KERN_INFO, &test, KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT
				  "# Subtest: %s", test_case->name);

			while (test.param_value) {
				kunit_run_case_catch_errors(suite, test_case, &test);

				if (param_desc[0] == '\0') {
					snprintf(param_desc, sizeof(param_desc),
						 "param-%d", test.param_index);
				}

				kunit_print_ok_not_ok(&test, KUNIT_LEVEL_CASE_PARAM,
						      test.status,
						      test.param_index + 1,
						      param_desc,
						      test.status_comment);

				kunit_update_stats(&param_stats, test.status);

				/* Get next param. */
				param_desc[0] = '\0';
				test.param_value = test_case->generate_params(test.param_value, param_desc);
				test.param_index++;
				test.status = KUNIT_SUCCESS;
				test.status_comment[0] = '\0';
				test.priv = NULL;
			}
		}

		kunit_print_attr((void *)test_case, true, KUNIT_LEVEL_CASE);

		kunit_print_test_stats(&test, param_stats);

		kunit_print_ok_not_ok(&test, KUNIT_LEVEL_CASE, test_case->status,
				      kunit_test_case_num(suite, test_case),
				      test_case->name,
				      test.status_comment);

		kunit_update_stats(&suite_stats, test_case->status);
		kunit_accumulate_stats(&total_stats, param_stats);
	}

	if (suite->suite_exit)
		suite->suite_exit(suite);

	kunit_print_suite_stats(suite, suite_stats, total_stats);
suite_end:
	kunit_print_suite_end(suite);

	return 0;
}
EXPORT_SYMBOL_GPL(kunit_run_tests);

static void kunit_init_suite(struct kunit_suite *suite)
{
	kunit_debugfs_create_suite(suite);
	suite->status_comment[0] = '\0';
	suite->suite_init_err = 0;

	if (suite->log)
		string_stream_clear(suite->log);
}

bool kunit_enabled(void)
{
	return enable_param;
}

int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites)
{
	unsigned int i;

	if (!kunit_enabled() && num_suites > 0) {
		pr_info("kunit: disabled\n");
		return 0;
	}

	kunit_suite_counter = 1;

	/* Use mutex lock to guard against running tests concurrently. */
	if (mutex_lock_interruptible(&kunit_run_lock)) {
		pr_err("kunit: test interrupted\n");
		return -EINTR;
	}
	static_branch_inc(&kunit_running);

	for (i = 0; i < num_suites; i++) {
		kunit_init_suite(suites[i]);
		kunit_run_tests(suites[i]);
	}

	static_branch_dec(&kunit_running);
	mutex_unlock(&kunit_run_lock);
	return 0;
}
EXPORT_SYMBOL_GPL(__kunit_test_suites_init);

static void kunit_exit_suite(struct kunit_suite *suite)
{
	kunit_debugfs_destroy_suite(suite);
}

void __kunit_test_suites_exit(struct kunit_suite **suites, int num_suites)
{
	unsigned int i;

	if (!kunit_enabled())
		return;

	for (i = 0; i < num_suites; i++)
		kunit_exit_suite(suites[i]);
}
EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);

#ifdef CONFIG_MODULES
static void kunit_module_init(struct module *mod)
{
	struct kunit_suite_set suite_set, filtered_set;
	struct kunit_suite_set normal_suite_set = {
		mod->kunit_suites, mod->kunit_suites + mod->num_kunit_suites,
	};
	struct kunit_suite_set init_suite_set = {
		mod->kunit_init_suites, mod->kunit_init_suites + mod->num_kunit_init_suites,
	};
	const char *action = kunit_action();
	int err = 0;

	if (mod->num_kunit_init_suites > 0)
		suite_set = kunit_merge_suite_sets(init_suite_set, normal_suite_set);
	else
		suite_set = normal_suite_set;

	filtered_set = kunit_filter_suites(&suite_set,
					kunit_filter_glob() ?: "*.*",
					kunit_filter(), kunit_filter_action(),
					&err);
	if (err)
		pr_err("kunit module: error filtering suites: %d\n", err);

	mod->kunit_suites = (struct kunit_suite **)filtered_set.start;
	mod->num_kunit_suites = filtered_set.end - filtered_set.start;

	if (mod->num_kunit_init_suites > 0)
		kfree(suite_set.start);

	if (!action)
		kunit_exec_run_tests(&filtered_set, false);
	else if (!strcmp(action, "list"))
		kunit_exec_list_tests(&filtered_set, false);
	else if (!strcmp(action, "list_attr"))
		kunit_exec_list_tests(&filtered_set, true);
	else
		pr_err("kunit: unknown action '%s'\n", action);
}

static void kunit_module_exit(struct module *mod)
{
	struct kunit_suite_set suite_set = {
		mod->kunit_suites, mod->kunit_suites + mod->num_kunit_suites,
	};
	const char *action = kunit_action();

	if (!action)
		__kunit_test_suites_exit(mod->kunit_suites,
					 mod->num_kunit_suites);

	if (suite_set.start)
		kunit_free_suite_set(suite_set);
}

static int kunit_module_notify(struct notifier_block *nb, unsigned long val,
			       void *data)
{
	struct module *mod = data;

	switch (val) {
	case MODULE_STATE_LIVE:
		break;
	case MODULE_STATE_GOING:
		kunit_module_exit(mod);
		break;
	case MODULE_STATE_COMING:
		kunit_module_init(mod);
		break;
	case MODULE_STATE_UNFORMED:
		break;
	}

	return 0;
}

static struct notifier_block kunit_mod_nb = {
	.notifier_call = kunit_module_notify,
	.priority = 0,
};
#endif

KUNIT_DEFINE_ACTION_WRAPPER(kfree_action_wrapper, kfree, const void *)

void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
{
	void *data;

	data = kmalloc_array(n, size, gfp);

	if (!data)
		return NULL;

	if (kunit_add_action_or_reset(test, kfree_action_wrapper, data) != 0)
		return NULL;

	return data;
}
EXPORT_SYMBOL_GPL(kunit_kmalloc_array);

void kunit_kfree(struct kunit *test, const void *ptr)
{
	if (!ptr)
		return;

	kunit_release_action(test, kfree_action_wrapper, (void *)ptr);
}
EXPORT_SYMBOL_GPL(kunit_kfree);

void kunit_cleanup(struct kunit *test)
{
	struct kunit_resource *res;
	unsigned long flags;

	/*
	 * test->resources is a stack - each allocation must be freed in the
	 * reverse order from which it was added since one resource may depend
	 * on another for its entire lifetime.
	 * Also, we cannot use the normal list_for_each constructs, even the
	 * safe ones because *arbitrary* nodes may be deleted when
	 * kunit_resource_free is called; the list_for_each_safe variants only
	 * protect against the current node being deleted, not the next.
	 */
	while (true) {
		spin_lock_irqsave(&test->lock, flags);
		if (list_empty(&test->resources)) {
			spin_unlock_irqrestore(&test->lock, flags);
			break;
		}
		res = list_last_entry(&test->resources,
				      struct kunit_resource,
				      node);
		/*
		 * Need to unlock here as a resource may remove another
		 * resource, and this can't happen if the test->lock
		 * is held.
		 */
		spin_unlock_irqrestore(&test->lock, flags);
		kunit_remove_resource(test, res);
	}
	current->kunit_test = NULL;
}
EXPORT_SYMBOL_GPL(kunit_cleanup);

static int __init kunit_init(void)
{
	/* Install the KUnit hook functions. */
	kunit_install_hooks();

	kunit_debugfs_init();

	kunit_bus_init();
#ifdef CONFIG_MODULES
	return register_module_notifier(&kunit_mod_nb);
#else
	return 0;
#endif
}
late_initcall(kunit_init);

static void __exit kunit_exit(void)
{
	memset(&kunit_hooks, 0, sizeof(kunit_hooks));
#ifdef CONFIG_MODULES
	unregister_module_notifier(&kunit_mod_nb);
#endif
	kunit_debugfs_cleanup();
}
module_exit(kunit_exit);

MODULE_LICENSE("GPL v2");