1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * KUnit API providing hooks for non-test code to interact with tests.
4 *
5 * Copyright (C) 2020, Google LLC.
6 * Author: Uriel Guajardo <urielguajardo@google.com>
7 */
8
9 #ifndef _KUNIT_TEST_BUG_H
10 #define _KUNIT_TEST_BUG_H
11
12 #include <linux/stddef.h> /* for NULL */
13
14 #if IS_ENABLED(CONFIG_KUNIT)
15
16 #include <linux/jump_label.h> /* For static branch */
17 #include <linux/sched.h>
18
19 /* Static key if KUnit is running any tests. */
20 DECLARE_STATIC_KEY_FALSE(kunit_running);
21
22 /* Hooks table: a table of function pointers filled in when kunit loads */
23 extern struct kunit_hooks_table {
24 __printf(3, 4) void (*fail_current_test)(const char*, int, const char*, ...);
25 void *(*get_static_stub_address)(struct kunit *test, void *real_fn_addr);
26 } kunit_hooks;
27
28 /**
29 * kunit_get_current_test() - Return a pointer to the currently running
30 * KUnit test.
31 *
32 * If a KUnit test is running in the current task, returns a pointer to its
33 * associated struct kunit. This pointer can then be passed to any KUnit
34 * function or assertion. If no test is running (or a test is running in a
35 * different task), returns NULL.
36 *
37 * This function is safe to call even when KUnit is disabled. If CONFIG_KUNIT
38 * is not enabled, it will compile down to nothing and will return quickly no
39 * test is running.
40 */
kunit_get_current_test(void)41 static inline struct kunit *kunit_get_current_test(void)
42 {
43 if (!static_branch_unlikely(&kunit_running))
44 return NULL;
45
46 return current->kunit_test;
47 }
48
49
50 /**
51 * kunit_fail_current_test() - If a KUnit test is running, fail it.
52 *
53 * If a KUnit test is running in the current task, mark that test as failed.
54 */
55 #define kunit_fail_current_test(fmt, ...) do { \
56 if (static_branch_unlikely(&kunit_running)) { \
57 /* Guaranteed to be non-NULL when kunit_running true*/ \
58 kunit_hooks.fail_current_test(__FILE__, __LINE__, \
59 fmt, ##__VA_ARGS__); \
60 } \
61 } while (0)
62
63 #else
64
kunit_get_current_test(void)65 static inline struct kunit *kunit_get_current_test(void) { return NULL; }
66
67 #define kunit_fail_current_test(fmt, ...) do {} while (0)
68
69 #endif
70
71 #endif /* _KUNIT_TEST_BUG_H */
72