aboutsummaryrefslogtreecommitdiff
path: root/lib/kunit/test.c
blob: 2f6cc01232322d3499b91e88430b5f1f17079ced (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Base unit test (KUnit) API.
 *
 * Copyright (C) 2019, Google LLC.
 * Author: Brendan Higgins <brendanhiggins@google.com>
 */

#include <kunit/test.h>
#include <kunit/test-bug.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/sched/debug.h>
#include <linux/sched.h>

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

#if IS_BUILTIN(CONFIG_KUNIT)
/*
 * Fail the current test and print an error message to the log.
 */
void __kunit_fail_current_test(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);
}
EXPORT_SYMBOL_GPL(__kunit_fail_current_test);
#endif

/*
 * Append formatted message to log, size of which is limited to
 * KUNIT_LOG_SIZE bytes (including null terminating byte).
 */
void kunit_log_append(char *log, const char *fmt, ...)
{
	char line[KUNIT_LOG_SIZE];
	va_list args;
	int len_left;

	if (!log)
		return;

	len_left = KUNIT_LOG_SIZE - strlen(log) - 1;
	if (len_left <= 0)
		return;

	va_start(args, fmt);
	vsnprintf(line, sizeof(line), fmt, args);
	va_end(args);

	strncat(log, line, len_left);
}
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);

static void kunit_print_subtest_start(struct kunit_suite *suite)
{
	kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "# Subtest: %s",
		  suite->name);
	kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "1..%zd",
		  kunit_suite_num_test_cases(suite));
}

static void kunit_print_ok_not_ok(void *test_or_suite,
				  bool is_test,
				  bool is_ok,
				  size_t test_number,
				  const char *description)
{
	struct kunit_suite *suite = is_test ? NULL : test_or_suite;
	struct kunit *test = is_test ? test_or_suite : NULL;

	/*
	 * We do not log the test suite results as doing so would
	 * mean debugfs display would consist of the test suite
	 * description and status prior to individual test results.
	 * Hence directly printk the suite status, and we will
	 * separately seq_printf() the suite status for the debugfs
	 * representation.
	 */
	if (suite)
		pr_info("%s %zd - %s\n",
			kunit_status_to_string(is_ok),
			test_number, description);
	else
		kunit_log(KERN_INFO, test, KUNIT_SUBTEST_INDENT "%s %zd - %s",
			  kunit_status_to_string(is_ok),
			  test_number, description);
}

bool kunit_suite_has_succeeded(struct kunit_suite *suite)
{
	const struct kunit_case *test_case;

	kunit_suite_for_each_test_case(suite, test_case) {
		if (!test_case->success)
			return false;
	}

	return true;
}
EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded);

static void kunit_print_subtest_end(struct kunit_suite *suite)
{
	static size_t kunit_suite_counter = 1;

	kunit_print_ok_not_ok((void *)suite, false,
			      kunit_suite_has_succeeded(suite),
			      kunit_suite_counter++,
			      suite->name);
}

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);
		kunit_kfree(test, buf);
	}
}

static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
{
	struct string_stream *stream;

	kunit_set_failure(test);

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

	assert->format(assert, stream);

	kunit_print_string_stream(test, stream);

	WARN_ON(string_stream_destroy(stream));
}

static 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");
}

void kunit_do_assertion(struct kunit *test,
			struct kunit_assert *assert,
			bool pass,
			const char *fmt, ...)
{
	va_list args;

	if (pass)
		return;

	va_start(args, fmt);

	assert->message.fmt = fmt;
	assert->message.va = &args;

	kunit_fail(test, assert);

	va_end(args);

	if (assert->type == KUNIT_ASSERTION)
		kunit_abort(test);
}
EXPORT_SYMBOL_GPL(kunit_do_assertion);

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

/*
 * 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)
{
	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;
		}
	}

	test_case->run_case(test);
}

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);
	/* This line may never be reached. */
	kunit_run_case_cleanup(test, suite);
}

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

	/*
	 * Test case was run, but aborted. It is the test case's business as to
	 * whether it failed or not, we just need to clean up.
	 */
	kunit_run_case_cleanup(test, suite);
}

/*
 * 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;

	kunit_init_test(test, test_case->name, test_case->log);
	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);

	test_case->success = test->success;
}

int kunit_run_tests(struct kunit_suite *suite)
{
	char param_desc[KUNIT_PARAM_DESC_SIZE];
	struct kunit_case *test_case;

	kunit_print_subtest_start(suite);

	kunit_suite_for_each_test_case(suite, test_case) {
		struct kunit test = { .param_value = NULL, .param_index = 0 };
		bool test_success = true;

		if (test_case->generate_params) {
			/* Get initial param. */
			param_desc[0] = '\0';
			test.param_value = test_case->generate_params(NULL, param_desc);
		}

		do {
			kunit_run_case_catch_errors(suite, test_case, &test);
			test_success &= test_case->success;

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

				kunit_log(KERN_INFO, &test,
					  KUNIT_SUBTEST_INDENT
					  "# %s: %s %d - %s",
					  test_case->name,
					  kunit_status_to_string(test.success),
					  test.param_index + 1, param_desc);

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

		kunit_print_ok_not_ok(&test, true, test_success,
				      kunit_test_case_num(suite, test_case),
				      test_case->name);
	}

	kunit_print_subtest_end(suite);

	return 0;
}
EXPORT_SYMBOL_GPL(kunit_run_tests);

static void kunit_init_suite(struct kunit_suite *suite)
{
	kunit_debugfs_create_suite(suite);
}

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

	for (i = 0; suites[i] != NULL; i++) {
		kunit_init_suite(suites[i]);
		kunit_run_tests(suites[i]);
	}
	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)
{
	unsigned int i;

	for (i = 0; suites[i] != NULL; i++)
		kunit_exit_suite(suites[i]);
}
EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);

/*
 * Used for static resources and when a kunit_resource * has been created by
 * kunit_alloc_resource().  When an init function is supplied, @data is passed
 * into the init function; otherwise, we simply set the resource data field to
 * the data value passed in.
 */
int kunit_add_resource(struct kunit *test,
		       kunit_resource_init_t init,
		       kunit_resource_free_t free,
		       struct kunit_resource *res,
		       void *data)
{
	int ret = 0;

	res->free = free;
	kref_init(&res->refcount);

	if (init) {
		ret = init(res, data);
		if (ret)
			return ret;
	} else {
		res->data = data;
	}

	spin_lock(&test->lock);
	list_add_tail(&res->node, &test->resources);
	/* refcount for list is established by kref_init() */
	spin_unlock(&test->lock);

	return ret;
}
EXPORT_SYMBOL_GPL(kunit_add_resource);

int kunit_add_named_resource(struct kunit *test,
			     kunit_resource_init_t init,
			     kunit_resource_free_t free,
			     struct kunit_resource *res,
			     const char *name,
			     void *data)
{
	struct kunit_resource *existing;

	if (!name)
		return -EINVAL;

	existing = kunit_find_named_resource(test, name);
	if (existing) {
		kunit_put_resource(existing);
		return -EEXIST;
	}

	res->name = name;

	return kunit_add_resource(test, init, free, res, data);
}
EXPORT_SYMBOL_GPL(kunit_add_named_resource);

struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
						    kunit_resource_init_t init,
						    kunit_resource_free_t free,
						    gfp_t internal_gfp,
						    void *data)
{
	struct kunit_resource *res;
	int ret;

	res = kzalloc(sizeof(*res), internal_gfp);
	if (!res)
		return NULL;

	ret = kunit_add_resource(test, init, free, res, data);
	if (!ret) {
		/*
		 * bump refcount for get; kunit_resource_put() should be called
		 * when done.
		 */
		kunit_get_resource(res);
		return res;
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource);

void kunit_remove_resource(struct kunit *test, struct kunit_resource *res)
{
	spin_lock(&test->lock);
	list_del(&res->node);
	spin_unlock(&test->lock);
	kunit_put_resource(res);
}
EXPORT_SYMBOL_GPL(kunit_remove_resource);

int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match,
			   void *match_data)
{
	struct kunit_resource *res = kunit_find_resource(test, match,
							 match_data);

	if (!res)
		return -ENOENT;

	kunit_remove_resource(test, res);

	/* We have a reference also via _find(); drop it. */
	kunit_put_resource(res);

	return 0;
}
EXPORT_SYMBOL_GPL(kunit_destroy_resource);

struct kunit_kmalloc_params {
	size_t size;
	gfp_t gfp;
};

static int kunit_kmalloc_init(struct kunit_resource *res, void *context)
{
	struct kunit_kmalloc_params *params = context;

	res->data = kmalloc(params->size, params->gfp);
	if (!res->data)
		return -ENOMEM;

	return 0;
}

static void kunit_kmalloc_free(struct kunit_resource *res)
{
	kfree(res->data);
}

void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp)
{
	struct kunit_kmalloc_params params = {
		.size = size,
		.gfp = gfp
	};

	return kunit_alloc_resource(test,
				    kunit_kmalloc_init,
				    kunit_kmalloc_free,
				    gfp,
				    &params);
}
EXPORT_SYMBOL_GPL(kunit_kmalloc);

void kunit_kfree(struct kunit *test, const void *ptr)
{
	struct kunit_resource *res;

	res = kunit_find_resource(test, kunit_resource_instance_match,
				  (void *)ptr);

	/*
	 * Removing the resource from the list of resources drops the
	 * reference count to 1; the final put will trigger the free.
	 */
	kunit_remove_resource(test, res);

	kunit_put_resource(res);

}
EXPORT_SYMBOL_GPL(kunit_kfree);

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

	/*
	 * 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(&test->lock);
		if (list_empty(&test->resources)) {
			spin_unlock(&test->lock);
			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(&test->lock);
		kunit_remove_resource(test, res);
	}
	current->kunit_test = NULL;
}
EXPORT_SYMBOL_GPL(kunit_cleanup);

static int __init kunit_init(void)
{
	kunit_debugfs_init();

	return 0;
}
late_initcall(kunit_init);

static void __exit kunit_exit(void)
{
	kunit_debugfs_cleanup();
}
module_exit(kunit_exit);

MODULE_LICENSE("GPL v2");