1 // SPDX-License-Identifier: GPL-2.0
3 * Base unit test (KUnit) API.
5 * Copyright (C) 2019, Google LLC.
6 * Author: Brendan Higgins <brendanhiggins@google.com>
9 #include <kunit/test.h>
10 #include <kunit/test-bug.h>
11 #include <linux/kernel.h>
12 #include <linux/kref.h>
13 #include <linux/moduleparam.h>
14 #include <linux/sched/debug.h>
15 #include <linux/sched.h>
18 #include "string-stream.h"
19 #include "try-catch-impl.h"
21 #if IS_BUILTIN(CONFIG_KUNIT)
23 * Fail the current test and print an error message to the log.
25 void __kunit_fail_current_test(const char *file, int line, const char *fmt, ...)
31 if (!current->kunit_test)
34 kunit_set_failure(current->kunit_test);
36 /* kunit_err() only accepts literals, so evaluate the args first. */
38 len = vsnprintf(NULL, 0, fmt, args) + 1;
41 buffer = kunit_kmalloc(current->kunit_test, len, GFP_KERNEL);
46 vsnprintf(buffer, len, fmt, args);
49 kunit_err(current->kunit_test, "%s:%d: %s", file, line, buffer);
50 kunit_kfree(current->kunit_test, buffer);
52 EXPORT_SYMBOL_GPL(__kunit_fail_current_test);
56 * KUnit statistic mode:
58 * 1 - only when there is more than one subtest
61 static int kunit_stats_enabled = 1;
62 module_param_named(stats_enabled, kunit_stats_enabled, int, 0644);
63 MODULE_PARM_DESC(stats_enabled,
64 "Print test stats: never (0), only for multiple subtests (1), or always (2)");
66 struct kunit_result_stats {
68 unsigned long skipped;
73 static bool kunit_should_print_stats(struct kunit_result_stats stats)
75 if (kunit_stats_enabled == 0)
78 if (kunit_stats_enabled == 2)
81 return (stats.total > 1);
84 static void kunit_print_test_stats(struct kunit *test,
85 struct kunit_result_stats stats)
87 if (!kunit_should_print_stats(stats))
90 kunit_log(KERN_INFO, test,
92 "# %s: pass:%lu fail:%lu skip:%lu total:%lu",
101 * Append formatted message to log, size of which is limited to
102 * KUNIT_LOG_SIZE bytes (including null terminating byte).
104 void kunit_log_append(char *log, const char *fmt, ...)
106 char line[KUNIT_LOG_SIZE];
113 len_left = KUNIT_LOG_SIZE - strlen(log) - 1;
118 vsnprintf(line, sizeof(line), fmt, args);
121 strncat(log, line, len_left);
123 EXPORT_SYMBOL_GPL(kunit_log_append);
125 size_t kunit_suite_num_test_cases(struct kunit_suite *suite)
127 struct kunit_case *test_case;
130 kunit_suite_for_each_test_case(suite, test_case)
135 EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases);
137 static void kunit_print_subtest_start(struct kunit_suite *suite)
139 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "# Subtest: %s",
141 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "1..%zd",
142 kunit_suite_num_test_cases(suite));
145 static void kunit_print_ok_not_ok(void *test_or_suite,
147 enum kunit_status status,
149 const char *description,
150 const char *directive)
152 struct kunit_suite *suite = is_test ? NULL : test_or_suite;
153 struct kunit *test = is_test ? test_or_suite : NULL;
154 const char *directive_header = (status == KUNIT_SKIPPED) ? " # SKIP " : "";
157 * We do not log the test suite results as doing so would
158 * mean debugfs display would consist of the test suite
159 * description and status prior to individual test results.
160 * Hence directly printk the suite status, and we will
161 * separately seq_printf() the suite status for the debugfs
165 pr_info("%s %zd - %s%s%s\n",
166 kunit_status_to_ok_not_ok(status),
167 test_number, description, directive_header,
168 (status == KUNIT_SKIPPED) ? directive : "");
170 kunit_log(KERN_INFO, test,
171 KUNIT_SUBTEST_INDENT "%s %zd - %s%s%s",
172 kunit_status_to_ok_not_ok(status),
173 test_number, description, directive_header,
174 (status == KUNIT_SKIPPED) ? directive : "");
177 enum kunit_status kunit_suite_has_succeeded(struct kunit_suite *suite)
179 const struct kunit_case *test_case;
180 enum kunit_status status = KUNIT_SKIPPED;
182 kunit_suite_for_each_test_case(suite, test_case) {
183 if (test_case->status == KUNIT_FAILURE)
184 return KUNIT_FAILURE;
185 else if (test_case->status == KUNIT_SUCCESS)
186 status = KUNIT_SUCCESS;
191 EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded);
193 static size_t kunit_suite_counter = 1;
195 static void kunit_print_subtest_end(struct kunit_suite *suite)
197 kunit_print_ok_not_ok((void *)suite, false,
198 kunit_suite_has_succeeded(suite),
199 kunit_suite_counter++,
201 suite->status_comment);
204 unsigned int kunit_test_case_num(struct kunit_suite *suite,
205 struct kunit_case *test_case)
207 struct kunit_case *tc;
210 kunit_suite_for_each_test_case(suite, tc) {
218 EXPORT_SYMBOL_GPL(kunit_test_case_num);
220 static void kunit_print_string_stream(struct kunit *test,
221 struct string_stream *stream)
223 struct string_stream_fragment *fragment;
226 if (string_stream_is_empty(stream))
229 buf = string_stream_get_string(stream);
232 "Could not allocate buffer, dumping stream:\n");
233 list_for_each_entry(fragment, &stream->fragments, node) {
234 kunit_err(test, "%s", fragment->fragment);
236 kunit_err(test, "\n");
238 kunit_err(test, "%s", buf);
239 kunit_kfree(test, buf);
243 static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
245 struct string_stream *stream;
247 kunit_set_failure(test);
249 stream = alloc_string_stream(test, GFP_KERNEL);
252 "Could not allocate stream to print failed assertion in %s:%d\n",
258 assert->format(assert, stream);
260 kunit_print_string_stream(test, stream);
262 WARN_ON(string_stream_destroy(stream));
265 static void __noreturn kunit_abort(struct kunit *test)
267 kunit_try_catch_throw(&test->try_catch); /* Does not return. */
270 * Throw could not abort from test.
272 * XXX: we should never reach this line! As kunit_try_catch_throw is
275 WARN_ONCE(true, "Throw could not abort from test!\n");
278 void kunit_do_assertion(struct kunit *test,
279 struct kunit_assert *assert,
281 const char *fmt, ...)
290 assert->message.fmt = fmt;
291 assert->message.va = &args;
293 kunit_fail(test, assert);
297 if (assert->type == KUNIT_ASSERTION)
300 EXPORT_SYMBOL_GPL(kunit_do_assertion);
302 void kunit_init_test(struct kunit *test, const char *name, char *log)
304 spin_lock_init(&test->lock);
305 INIT_LIST_HEAD(&test->resources);
310 test->status = KUNIT_SUCCESS;
311 test->status_comment[0] = '\0';
313 EXPORT_SYMBOL_GPL(kunit_init_test);
316 * Initializes and runs test case. Does not clean up or do post validations.
318 static void kunit_run_case_internal(struct kunit *test,
319 struct kunit_suite *suite,
320 struct kunit_case *test_case)
325 ret = suite->init(test);
327 kunit_err(test, "failed to initialize: %d\n", ret);
328 kunit_set_failure(test);
333 test_case->run_case(test);
336 static void kunit_case_internal_cleanup(struct kunit *test)
342 * Performs post validations and cleanup after a test case was run.
343 * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
345 static void kunit_run_case_cleanup(struct kunit *test,
346 struct kunit_suite *suite)
351 kunit_case_internal_cleanup(test);
354 struct kunit_try_catch_context {
356 struct kunit_suite *suite;
357 struct kunit_case *test_case;
360 static void kunit_try_run_case(void *data)
362 struct kunit_try_catch_context *ctx = data;
363 struct kunit *test = ctx->test;
364 struct kunit_suite *suite = ctx->suite;
365 struct kunit_case *test_case = ctx->test_case;
367 current->kunit_test = test;
370 * kunit_run_case_internal may encounter a fatal error; if it does,
371 * abort will be called, this thread will exit, and finally the parent
372 * thread will resume control and handle any necessary clean up.
374 kunit_run_case_internal(test, suite, test_case);
375 /* This line may never be reached. */
376 kunit_run_case_cleanup(test, suite);
379 static void kunit_catch_run_case(void *data)
381 struct kunit_try_catch_context *ctx = data;
382 struct kunit *test = ctx->test;
383 struct kunit_suite *suite = ctx->suite;
384 int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
387 kunit_set_failure(test);
389 * Test case could not finish, we have no idea what state it is
390 * in, so don't do clean up.
392 if (try_exit_code == -ETIMEDOUT) {
393 kunit_err(test, "test case timed out\n");
395 * Unknown internal error occurred preventing test case from
396 * running, so there is nothing to clean up.
399 kunit_err(test, "internal error occurred preventing test case from running: %d\n",
406 * Test case was run, but aborted. It is the test case's business as to
407 * whether it failed or not, we just need to clean up.
409 kunit_run_case_cleanup(test, suite);
413 * Performs all logic to run a test case. It also catches most errors that
414 * occur in a test case and reports them as failures.
416 static void kunit_run_case_catch_errors(struct kunit_suite *suite,
417 struct kunit_case *test_case,
420 struct kunit_try_catch_context context;
421 struct kunit_try_catch *try_catch;
423 kunit_init_test(test, test_case->name, test_case->log);
424 try_catch = &test->try_catch;
426 kunit_try_catch_init(try_catch,
429 kunit_catch_run_case);
431 context.suite = suite;
432 context.test_case = test_case;
433 kunit_try_catch_run(try_catch, &context);
435 /* Propagate the parameter result to the test case. */
436 if (test->status == KUNIT_FAILURE)
437 test_case->status = KUNIT_FAILURE;
438 else if (test_case->status != KUNIT_FAILURE && test->status == KUNIT_SUCCESS)
439 test_case->status = KUNIT_SUCCESS;
442 static void kunit_print_suite_stats(struct kunit_suite *suite,
443 struct kunit_result_stats suite_stats,
444 struct kunit_result_stats param_stats)
446 if (kunit_should_print_stats(suite_stats)) {
447 kunit_log(KERN_INFO, suite,
448 "# %s: pass:%lu fail:%lu skip:%lu total:%lu",
456 if (kunit_should_print_stats(param_stats)) {
457 kunit_log(KERN_INFO, suite,
458 "# Totals: pass:%lu fail:%lu skip:%lu total:%lu",
466 static void kunit_update_stats(struct kunit_result_stats *stats,
467 enum kunit_status status)
484 static void kunit_accumulate_stats(struct kunit_result_stats *total,
485 struct kunit_result_stats add)
487 total->passed += add.passed;
488 total->skipped += add.skipped;
489 total->failed += add.failed;
490 total->total += add.total;
493 int kunit_run_tests(struct kunit_suite *suite)
495 char param_desc[KUNIT_PARAM_DESC_SIZE];
496 struct kunit_case *test_case;
497 struct kunit_result_stats suite_stats = { 0 };
498 struct kunit_result_stats total_stats = { 0 };
500 kunit_print_subtest_start(suite);
502 kunit_suite_for_each_test_case(suite, test_case) {
503 struct kunit test = { .param_value = NULL, .param_index = 0 };
504 struct kunit_result_stats param_stats = { 0 };
505 test_case->status = KUNIT_SKIPPED;
507 if (!test_case->generate_params) {
508 /* Non-parameterised test. */
509 kunit_run_case_catch_errors(suite, test_case, &test);
510 kunit_update_stats(¶m_stats, test.status);
512 /* Get initial param. */
513 param_desc[0] = '\0';
514 test.param_value = test_case->generate_params(NULL, param_desc);
515 kunit_log(KERN_INFO, &test, KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT
516 "# Subtest: %s", test_case->name);
518 while (test.param_value) {
519 kunit_run_case_catch_errors(suite, test_case, &test);
521 if (param_desc[0] == '\0') {
522 snprintf(param_desc, sizeof(param_desc),
523 "param-%d", test.param_index);
526 kunit_log(KERN_INFO, &test,
527 KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT
529 kunit_status_to_ok_not_ok(test.status),
530 test.param_index + 1, param_desc);
532 /* Get next param. */
533 param_desc[0] = '\0';
534 test.param_value = test_case->generate_params(test.param_value, param_desc);
537 kunit_update_stats(¶m_stats, test.status);
542 kunit_print_test_stats(&test, param_stats);
544 kunit_print_ok_not_ok(&test, true, test_case->status,
545 kunit_test_case_num(suite, test_case),
547 test.status_comment);
549 kunit_update_stats(&suite_stats, test_case->status);
550 kunit_accumulate_stats(&total_stats, param_stats);
553 kunit_print_suite_stats(suite, suite_stats, total_stats);
554 kunit_print_subtest_end(suite);
558 EXPORT_SYMBOL_GPL(kunit_run_tests);
560 static void kunit_init_suite(struct kunit_suite *suite)
562 kunit_debugfs_create_suite(suite);
563 suite->status_comment[0] = '\0';
566 int __kunit_test_suites_init(struct kunit_suite * const * const suites)
570 for (i = 0; suites[i] != NULL; i++) {
571 kunit_init_suite(suites[i]);
572 kunit_run_tests(suites[i]);
576 EXPORT_SYMBOL_GPL(__kunit_test_suites_init);
578 static void kunit_exit_suite(struct kunit_suite *suite)
580 kunit_debugfs_destroy_suite(suite);
583 void __kunit_test_suites_exit(struct kunit_suite **suites)
587 for (i = 0; suites[i] != NULL; i++)
588 kunit_exit_suite(suites[i]);
590 kunit_suite_counter = 1;
592 EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
595 * Used for static resources and when a kunit_resource * has been created by
596 * kunit_alloc_resource(). When an init function is supplied, @data is passed
597 * into the init function; otherwise, we simply set the resource data field to
598 * the data value passed in.
600 int kunit_add_resource(struct kunit *test,
601 kunit_resource_init_t init,
602 kunit_resource_free_t free,
603 struct kunit_resource *res,
610 kref_init(&res->refcount);
613 ret = init(res, data);
620 spin_lock_irqsave(&test->lock, flags);
621 list_add_tail(&res->node, &test->resources);
622 /* refcount for list is established by kref_init() */
623 spin_unlock_irqrestore(&test->lock, flags);
627 EXPORT_SYMBOL_GPL(kunit_add_resource);
629 int kunit_add_named_resource(struct kunit *test,
630 kunit_resource_init_t init,
631 kunit_resource_free_t free,
632 struct kunit_resource *res,
636 struct kunit_resource *existing;
641 existing = kunit_find_named_resource(test, name);
643 kunit_put_resource(existing);
649 return kunit_add_resource(test, init, free, res, data);
651 EXPORT_SYMBOL_GPL(kunit_add_named_resource);
653 struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
654 kunit_resource_init_t init,
655 kunit_resource_free_t free,
659 struct kunit_resource *res;
662 res = kzalloc(sizeof(*res), internal_gfp);
666 ret = kunit_add_resource(test, init, free, res, data);
669 * bump refcount for get; kunit_resource_put() should be called
672 kunit_get_resource(res);
677 EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource);
679 void kunit_remove_resource(struct kunit *test, struct kunit_resource *res)
683 spin_lock_irqsave(&test->lock, flags);
684 list_del(&res->node);
685 spin_unlock_irqrestore(&test->lock, flags);
686 kunit_put_resource(res);
688 EXPORT_SYMBOL_GPL(kunit_remove_resource);
690 int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match,
693 struct kunit_resource *res = kunit_find_resource(test, match,
699 kunit_remove_resource(test, res);
701 /* We have a reference also via _find(); drop it. */
702 kunit_put_resource(res);
706 EXPORT_SYMBOL_GPL(kunit_destroy_resource);
708 struct kunit_kmalloc_array_params {
714 static int kunit_kmalloc_array_init(struct kunit_resource *res, void *context)
716 struct kunit_kmalloc_array_params *params = context;
718 res->data = kmalloc_array(params->n, params->size, params->gfp);
725 static void kunit_kmalloc_array_free(struct kunit_resource *res)
730 void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
732 struct kunit_kmalloc_array_params params = {
738 return kunit_alloc_resource(test,
739 kunit_kmalloc_array_init,
740 kunit_kmalloc_array_free,
744 EXPORT_SYMBOL_GPL(kunit_kmalloc_array);
746 void kunit_kfree(struct kunit *test, const void *ptr)
748 struct kunit_resource *res;
750 res = kunit_find_resource(test, kunit_resource_instance_match,
754 * Removing the resource from the list of resources drops the
755 * reference count to 1; the final put will trigger the free.
757 kunit_remove_resource(test, res);
759 kunit_put_resource(res);
762 EXPORT_SYMBOL_GPL(kunit_kfree);
764 void kunit_cleanup(struct kunit *test)
766 struct kunit_resource *res;
770 * test->resources is a stack - each allocation must be freed in the
771 * reverse order from which it was added since one resource may depend
772 * on another for its entire lifetime.
773 * Also, we cannot use the normal list_for_each constructs, even the
774 * safe ones because *arbitrary* nodes may be deleted when
775 * kunit_resource_free is called; the list_for_each_safe variants only
776 * protect against the current node being deleted, not the next.
779 spin_lock_irqsave(&test->lock, flags);
780 if (list_empty(&test->resources)) {
781 spin_unlock_irqrestore(&test->lock, flags);
784 res = list_last_entry(&test->resources,
785 struct kunit_resource,
788 * Need to unlock here as a resource may remove another
789 * resource, and this can't happen if the test->lock
792 spin_unlock_irqrestore(&test->lock, flags);
793 kunit_remove_resource(test, res);
795 current->kunit_test = NULL;
797 EXPORT_SYMBOL_GPL(kunit_cleanup);
799 static int __init kunit_init(void)
801 kunit_debugfs_init();
805 late_initcall(kunit_init);
807 static void __exit kunit_exit(void)
809 kunit_debugfs_cleanup();
811 module_exit(kunit_exit);
813 MODULE_LICENSE("GPL v2");