1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Test cases for functions and macros in bits.h
4 */
5
6 #include <kunit/test.h>
7 #include <linux/bits.h>
8
9
genmask_test(struct kunit * test)10 static void genmask_test(struct kunit *test)
11 {
12 KUNIT_EXPECT_EQ(test, 1ul, GENMASK(0, 0));
13 KUNIT_EXPECT_EQ(test, 3ul, GENMASK(1, 0));
14 KUNIT_EXPECT_EQ(test, 6ul, GENMASK(2, 1));
15 KUNIT_EXPECT_EQ(test, 0xFFFFFFFFul, GENMASK(31, 0));
16
17 #ifdef TEST_GENMASK_FAILURES
18 /* these should fail compilation */
19 GENMASK(0, 1);
20 GENMASK(0, 10);
21 GENMASK(9, 10);
22 #endif
23
24
25 }
26
genmask_ull_test(struct kunit * test)27 static void genmask_ull_test(struct kunit *test)
28 {
29 KUNIT_EXPECT_EQ(test, 1ull, GENMASK_ULL(0, 0));
30 KUNIT_EXPECT_EQ(test, 3ull, GENMASK_ULL(1, 0));
31 KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_ULL(39, 21));
32 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_ULL(63, 0));
33
34 #ifdef TEST_GENMASK_FAILURES
35 /* these should fail compilation */
36 GENMASK_ULL(0, 1);
37 GENMASK_ULL(0, 10);
38 GENMASK_ULL(9, 10);
39 #endif
40 }
41
genmask_u128_test(struct kunit * test)42 static void genmask_u128_test(struct kunit *test)
43 {
44 #ifdef CONFIG_ARCH_SUPPORTS_INT128
45 /* Below 64 bit masks */
46 KUNIT_EXPECT_EQ(test, 0x0000000000000001ull, GENMASK_U128(0, 0));
47 KUNIT_EXPECT_EQ(test, 0x0000000000000003ull, GENMASK_U128(1, 0));
48 KUNIT_EXPECT_EQ(test, 0x0000000000000006ull, GENMASK_U128(2, 1));
49 KUNIT_EXPECT_EQ(test, 0x00000000ffffffffull, GENMASK_U128(31, 0));
50 KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_U128(39, 21));
51 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_U128(63, 0));
52
53 /* Above 64 bit masks - only 64 bit portion can be validated once */
54 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_U128(64, 0) >> 1);
55 KUNIT_EXPECT_EQ(test, 0x00000000ffffffffull, GENMASK_U128(81, 50) >> 50);
56 KUNIT_EXPECT_EQ(test, 0x0000000000ffffffull, GENMASK_U128(87, 64) >> 64);
57 KUNIT_EXPECT_EQ(test, 0x0000000000ff0000ull, GENMASK_U128(87, 80) >> 64);
58
59 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_U128(127, 0) >> 64);
60 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, (u64)GENMASK_U128(127, 0));
61 KUNIT_EXPECT_EQ(test, 0x0000000000000003ull, GENMASK_U128(127, 126) >> 126);
62 KUNIT_EXPECT_EQ(test, 0x0000000000000001ull, GENMASK_U128(127, 127) >> 127);
63 #ifdef TEST_GENMASK_FAILURES
64 /* these should fail compilation */
65 GENMASK_U128(0, 1);
66 GENMASK_U128(0, 10);
67 GENMASK_U128(9, 10);
68 #endif /* TEST_GENMASK_FAILURES */
69 #endif /* CONFIG_ARCH_SUPPORTS_INT128 */
70 }
71
genmask_input_check_test(struct kunit * test)72 static void genmask_input_check_test(struct kunit *test)
73 {
74 unsigned int x, y;
75 int z, w;
76
77 /* Unknown input */
78 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, 0));
79 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, x));
80 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, y));
81
82 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, 0));
83 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, z));
84 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, w));
85
86 /* Valid input */
87 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1));
88 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21));
89 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(100, 80));
90 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(110, 65));
91 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(127, 0));
92 }
93
94
95 static struct kunit_case bits_test_cases[] = {
96 KUNIT_CASE(genmask_test),
97 KUNIT_CASE(genmask_ull_test),
98 KUNIT_CASE(genmask_u128_test),
99 KUNIT_CASE(genmask_input_check_test),
100 {}
101 };
102
103 static struct kunit_suite bits_test_suite = {
104 .name = "bits-test",
105 .test_cases = bits_test_cases,
106 };
107 kunit_test_suite(bits_test_suite);
108
109 MODULE_DESCRIPTION("Test cases for functions and macros in bits.h");
110 MODULE_LICENSE("GPL");
111