1 // SPDX-License-Identifier: GPL-2.0
3 * Base unit test (KUnit) API.
5 * Copyright (C) 2019, Google LLC.
9 #include <kunit/test.h>
10 #include <linux/kernel.h>
11 #include <linux/kref.h>
12 #include <linux/sched/debug.h>
13 #include <linux/sched.h>
16 #include "string-stream.h"
17 #include "try-catch-impl.h"
20 * Append formatted message to log, size of which is limited to
21 * KUNIT_LOG_SIZE bytes (including null terminating byte).
23 void kunit_log_append(char *log, const char *fmt, ...)
25 char line[KUNIT_LOG_SIZE];
32 len_left = KUNIT_LOG_SIZE - strlen(log) - 1;
37 vsnprintf(line, sizeof(line), fmt, args);
40 strncat(log, line, len_left);
42 EXPORT_SYMBOL_GPL(kunit_log_append);
44 size_t kunit_suite_num_test_cases(struct kunit_suite *suite)
46 struct kunit_case *test_case;
49 kunit_suite_for_each_test_case(suite, test_case)
54 EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases);
56 static void kunit_print_subtest_start(struct kunit_suite *suite)
58 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "# Subtest: %s",
60 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "1..%zd",
61 kunit_suite_num_test_cases(suite));
64 static void kunit_print_ok_not_ok(void *test_or_suite,
68 const char *description)
70 struct kunit_suite *suite = is_test ? NULL : test_or_suite;
71 struct kunit *test = is_test ? test_or_suite : NULL;
74 * We do not log the test suite results as doing so would
75 * mean debugfs display would consist of the test suite
76 * description and status prior to individual test results.
77 * Hence directly printk the suite status, and we will
78 * separately seq_printf() the suite status for the debugfs
82 pr_info("%s %zd - %s\n",
83 kunit_status_to_string(is_ok),
84 test_number, description);
86 kunit_log(KERN_INFO, test, KUNIT_SUBTEST_INDENT "%s %zd - %s",
87 kunit_status_to_string(is_ok),
88 test_number, description);
91 bool kunit_suite_has_succeeded(struct kunit_suite *suite)
93 const struct kunit_case *test_case;
95 kunit_suite_for_each_test_case(suite, test_case) {
96 if (!test_case->success)
102 EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded);
104 static void kunit_print_subtest_end(struct kunit_suite *suite)
106 static size_t kunit_suite_counter = 1;
108 kunit_print_ok_not_ok((void *)suite, false,
109 kunit_suite_has_succeeded(suite),
110 kunit_suite_counter++,
114 unsigned int kunit_test_case_num(struct kunit_suite *suite,
115 struct kunit_case *test_case)
117 struct kunit_case *tc;
120 kunit_suite_for_each_test_case(suite, tc) {
128 EXPORT_SYMBOL_GPL(kunit_test_case_num);
130 static void kunit_print_string_stream(struct kunit *test,
131 struct string_stream *stream)
133 struct string_stream_fragment *fragment;
136 if (string_stream_is_empty(stream))
139 buf = string_stream_get_string(stream);
142 "Could not allocate buffer, dumping stream:\n");
143 list_for_each_entry(fragment, &stream->fragments, node) {
144 kunit_err(test, "%s", fragment->fragment);
146 kunit_err(test, "\n");
148 kunit_err(test, "%s", buf);
149 kunit_kfree(test, buf);
153 static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
155 struct string_stream *stream;
157 kunit_set_failure(test);
159 stream = alloc_string_stream(test, GFP_KERNEL);
162 "Could not allocate stream to print failed assertion in %s:%d\n",
168 assert->format(assert, stream);
170 kunit_print_string_stream(test, stream);
172 WARN_ON(string_stream_destroy(stream));
175 static void __noreturn kunit_abort(struct kunit *test)
177 kunit_try_catch_throw(&test->try_catch); /* Does not return. */
180 * Throw could not abort from test.
182 * XXX: we should never reach this line! As kunit_try_catch_throw is
185 WARN_ONCE(true, "Throw could not abort from test!\n");
188 void kunit_do_assertion(struct kunit *test,
189 struct kunit_assert *assert,
191 const char *fmt, ...)
200 assert->message.fmt = fmt;
201 assert->message.va = &args;
203 kunit_fail(test, assert);
207 if (assert->type == KUNIT_ASSERTION)
210 EXPORT_SYMBOL_GPL(kunit_do_assertion);
212 void kunit_init_test(struct kunit *test, const char *name, char *log)
214 spin_lock_init(&test->lock);
215 INIT_LIST_HEAD(&test->resources);
220 test->success = true;
222 EXPORT_SYMBOL_GPL(kunit_init_test);
225 * Initializes and runs test case. Does not clean up or do post validations.
227 static void kunit_run_case_internal(struct kunit *test,
228 struct kunit_suite *suite,
229 struct kunit_case *test_case)
234 ret = suite->init(test);
236 kunit_err(test, "failed to initialize: %d\n", ret);
237 kunit_set_failure(test);
242 test_case->run_case(test);
245 static void kunit_case_internal_cleanup(struct kunit *test)
251 * Performs post validations and cleanup after a test case was run.
252 * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
254 static void kunit_run_case_cleanup(struct kunit *test,
255 struct kunit_suite *suite)
260 kunit_case_internal_cleanup(test);
263 struct kunit_try_catch_context {
265 struct kunit_suite *suite;
266 struct kunit_case *test_case;
269 static void kunit_try_run_case(void *data)
271 struct kunit_try_catch_context *ctx = data;
272 struct kunit *test = ctx->test;
273 struct kunit_suite *suite = ctx->suite;
274 struct kunit_case *test_case = ctx->test_case;
276 #if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))
277 current->kunit_test = test;
278 #endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT) */
281 * kunit_run_case_internal may encounter a fatal error; if it does,
282 * abort will be called, this thread will exit, and finally the parent
283 * thread will resume control and handle any necessary clean up.
285 kunit_run_case_internal(test, suite, test_case);
286 /* This line may never be reached. */
287 kunit_run_case_cleanup(test, suite);
290 static void kunit_catch_run_case(void *data)
292 struct kunit_try_catch_context *ctx = data;
293 struct kunit *test = ctx->test;
294 struct kunit_suite *suite = ctx->suite;
295 int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
298 kunit_set_failure(test);
300 * Test case could not finish, we have no idea what state it is
301 * in, so don't do clean up.
303 if (try_exit_code == -ETIMEDOUT) {
304 kunit_err(test, "test case timed out\n");
306 * Unknown internal error occurred preventing test case from
307 * running, so there is nothing to clean up.
310 kunit_err(test, "internal error occurred preventing test case from running: %d\n",
317 * Test case was run, but aborted. It is the test case's business as to
318 * whether it failed or not, we just need to clean up.
320 kunit_run_case_cleanup(test, suite);
324 * Performs all logic to run a test case. It also catches most errors that
325 * occur in a test case and reports them as failures.
327 static void kunit_run_case_catch_errors(struct kunit_suite *suite,
328 struct kunit_case *test_case,
331 struct kunit_try_catch_context context;
332 struct kunit_try_catch *try_catch;
334 kunit_init_test(test, test_case->name, test_case->log);
335 try_catch = &test->try_catch;
337 kunit_try_catch_init(try_catch,
340 kunit_catch_run_case);
342 context.suite = suite;
343 context.test_case = test_case;
344 kunit_try_catch_run(try_catch, &context);
346 test_case->success = test->success;
349 int kunit_run_tests(struct kunit_suite *suite)
351 char param_desc[KUNIT_PARAM_DESC_SIZE];
352 struct kunit_case *test_case;
354 kunit_print_subtest_start(suite);
356 kunit_suite_for_each_test_case(suite, test_case) {
357 struct kunit test = { .param_value = NULL, .param_index = 0 };
358 bool test_success = true;
360 if (test_case->generate_params) {
361 /* Get initial param. */
362 param_desc[0] = '\0';
363 test.param_value = test_case->generate_params(NULL, param_desc);
367 kunit_run_case_catch_errors(suite, test_case, &test);
368 test_success &= test_case->success;
370 if (test_case->generate_params) {
371 if (param_desc[0] == '\0') {
372 snprintf(param_desc, sizeof(param_desc),
373 "param-%d", test.param_index);
376 kunit_log(KERN_INFO, &test,
380 kunit_status_to_string(test.success),
381 test.param_index + 1, param_desc);
383 /* Get next param. */
384 param_desc[0] = '\0';
385 test.param_value = test_case->generate_params(test.param_value, param_desc);
388 } while (test.param_value);
390 kunit_print_ok_not_ok(&test, true, test_success,
391 kunit_test_case_num(suite, test_case),
395 kunit_print_subtest_end(suite);
399 EXPORT_SYMBOL_GPL(kunit_run_tests);
401 static void kunit_init_suite(struct kunit_suite *suite)
403 kunit_debugfs_create_suite(suite);
406 int __kunit_test_suites_init(struct kunit_suite * const * const suites)
410 for (i = 0; suites[i] != NULL; i++) {
411 kunit_init_suite(suites[i]);
412 kunit_run_tests(suites[i]);
416 EXPORT_SYMBOL_GPL(__kunit_test_suites_init);
418 static void kunit_exit_suite(struct kunit_suite *suite)
420 kunit_debugfs_destroy_suite(suite);
423 void __kunit_test_suites_exit(struct kunit_suite **suites)
427 for (i = 0; suites[i] != NULL; i++)
428 kunit_exit_suite(suites[i]);
430 EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
433 * Used for static resources and when a kunit_resource * has been created by
434 * kunit_alloc_resource(). When an init function is supplied, @data is passed
435 * into the init function; otherwise, we simply set the resource data field to
436 * the data value passed in.
438 int kunit_add_resource(struct kunit *test,
439 kunit_resource_init_t init,
440 kunit_resource_free_t free,
441 struct kunit_resource *res,
447 kref_init(&res->refcount);
450 ret = init(res, data);
457 spin_lock(&test->lock);
458 list_add_tail(&res->node, &test->resources);
459 /* refcount for list is established by kref_init() */
460 spin_unlock(&test->lock);
464 EXPORT_SYMBOL_GPL(kunit_add_resource);
466 int kunit_add_named_resource(struct kunit *test,
467 kunit_resource_init_t init,
468 kunit_resource_free_t free,
469 struct kunit_resource *res,
473 struct kunit_resource *existing;
478 existing = kunit_find_named_resource(test, name);
480 kunit_put_resource(existing);
486 return kunit_add_resource(test, init, free, res, data);
488 EXPORT_SYMBOL_GPL(kunit_add_named_resource);
490 struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
491 kunit_resource_init_t init,
492 kunit_resource_free_t free,
496 struct kunit_resource *res;
499 res = kzalloc(sizeof(*res), internal_gfp);
503 ret = kunit_add_resource(test, init, free, res, data);
506 * bump refcount for get; kunit_resource_put() should be called
509 kunit_get_resource(res);
514 EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource);
516 void kunit_remove_resource(struct kunit *test, struct kunit_resource *res)
518 spin_lock(&test->lock);
519 list_del(&res->node);
520 spin_unlock(&test->lock);
521 kunit_put_resource(res);
523 EXPORT_SYMBOL_GPL(kunit_remove_resource);
525 int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match,
528 struct kunit_resource *res = kunit_find_resource(test, match,
534 kunit_remove_resource(test, res);
536 /* We have a reference also via _find(); drop it. */
537 kunit_put_resource(res);
541 EXPORT_SYMBOL_GPL(kunit_destroy_resource);
543 struct kunit_kmalloc_params {
548 static int kunit_kmalloc_init(struct kunit_resource *res, void *context)
550 struct kunit_kmalloc_params *params = context;
552 res->data = kmalloc(params->size, params->gfp);
559 static void kunit_kmalloc_free(struct kunit_resource *res)
564 void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp)
566 struct kunit_kmalloc_params params = {
571 return kunit_alloc_resource(test,
577 EXPORT_SYMBOL_GPL(kunit_kmalloc);
579 void kunit_kfree(struct kunit *test, const void *ptr)
581 struct kunit_resource *res;
583 res = kunit_find_resource(test, kunit_resource_instance_match,
587 * Removing the resource from the list of resources drops the
588 * reference count to 1; the final put will trigger the free.
590 kunit_remove_resource(test, res);
592 kunit_put_resource(res);
595 EXPORT_SYMBOL_GPL(kunit_kfree);
597 void kunit_cleanup(struct kunit *test)
599 struct kunit_resource *res;
602 * test->resources is a stack - each allocation must be freed in the
603 * reverse order from which it was added since one resource may depend
604 * on another for its entire lifetime.
605 * Also, we cannot use the normal list_for_each constructs, even the
606 * safe ones because *arbitrary* nodes may be deleted when
607 * kunit_resource_free is called; the list_for_each_safe variants only
608 * protect against the current node being deleted, not the next.
611 spin_lock(&test->lock);
612 if (list_empty(&test->resources)) {
613 spin_unlock(&test->lock);
616 res = list_last_entry(&test->resources,
617 struct kunit_resource,
620 * Need to unlock here as a resource may remove another
621 * resource, and this can't happen if the test->lock
624 spin_unlock(&test->lock);
625 kunit_remove_resource(test, res);
627 #if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))
628 current->kunit_test = NULL;
629 #endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT)*/
631 EXPORT_SYMBOL_GPL(kunit_cleanup);
633 static int __init kunit_init(void)
635 kunit_debugfs_init();
639 late_initcall(kunit_init);
641 static void __exit kunit_exit(void)
643 kunit_debugfs_cleanup();
645 module_exit(kunit_exit);
647 MODULE_LICENSE("GPL v2");