Merge tag 'sched-urgent-2020-11-22' of git://git.kernel.org/pub/scm/linux/kernel...
[platform/kernel/linux-rpi.git] / lib / bitfield_kunit.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Test cases for bitfield helpers.
4  */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <kunit/test.h>
9 #include <linux/bitfield.h>
10
11 #define CHECK_ENC_GET_U(tp, v, field, res) do {                         \
12                 {                                                       \
13                         u##tp _res;                                     \
14                                                                         \
15                         _res = u##tp##_encode_bits(v, field);           \
16                         KUNIT_ASSERT_FALSE_MSG(context, _res != res,    \
17                                        "u" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != " #res "\n",      \
18                                        (u64)_res);                      \
19                         KUNIT_ASSERT_FALSE(context,                     \
20                                    u##tp##_get_bits(_res, field) != v); \
21                 }                                                       \
22         } while (0)
23
24 #define CHECK_ENC_GET_LE(tp, v, field, res) do {                        \
25                 {                                                       \
26                         __le##tp _res;                                  \
27                                                                         \
28                         _res = le##tp##_encode_bits(v, field);          \
29                         KUNIT_ASSERT_FALSE_MSG(context,                 \
30                                        _res != cpu_to_le##tp(res),      \
31                                        "le" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx",\
32                                        (u64)le##tp##_to_cpu(_res),      \
33                                        (u64)(res));                     \
34                         KUNIT_ASSERT_FALSE(context,                     \
35                                    le##tp##_get_bits(_res, field) != v);\
36                 }                                                       \
37         } while (0)
38
39 #define CHECK_ENC_GET_BE(tp, v, field, res) do {                        \
40                 {                                                       \
41                         __be##tp _res;                                  \
42                                                                         \
43                         _res = be##tp##_encode_bits(v, field);          \
44                         KUNIT_ASSERT_FALSE_MSG(context,                 \
45                                        _res != cpu_to_be##tp(res),      \
46                                        "be" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx", \
47                                        (u64)be##tp##_to_cpu(_res),      \
48                                        (u64)(res));                     \
49                         KUNIT_ASSERT_FALSE(context,                     \
50                                    be##tp##_get_bits(_res, field) != v);\
51                 }                                                       \
52         } while (0)
53
54 #define CHECK_ENC_GET(tp, v, field, res) do {                           \
55                 CHECK_ENC_GET_U(tp, v, field, res);                     \
56                 CHECK_ENC_GET_LE(tp, v, field, res);                    \
57                 CHECK_ENC_GET_BE(tp, v, field, res);                    \
58         } while (0)
59
60 static void __init test_bitfields_constants(struct kunit *context)
61 {
62         /*
63          * NOTE
64          * This whole function compiles (or at least should, if everything
65          * is going according to plan) to nothing after optimisation.
66          */
67
68         CHECK_ENC_GET(16,  1, 0x000f, 0x0001);
69         CHECK_ENC_GET(16,  3, 0x00f0, 0x0030);
70         CHECK_ENC_GET(16,  5, 0x0f00, 0x0500);
71         CHECK_ENC_GET(16,  7, 0xf000, 0x7000);
72         CHECK_ENC_GET(16, 14, 0x000f, 0x000e);
73         CHECK_ENC_GET(16, 15, 0x00f0, 0x00f0);
74
75         CHECK_ENC_GET_U(8,  1, 0x0f, 0x01);
76         CHECK_ENC_GET_U(8,  3, 0xf0, 0x30);
77         CHECK_ENC_GET_U(8, 14, 0x0f, 0x0e);
78         CHECK_ENC_GET_U(8, 15, 0xf0, 0xf0);
79
80         CHECK_ENC_GET(32,  1, 0x00000f00, 0x00000100);
81         CHECK_ENC_GET(32,  3, 0x0000f000, 0x00003000);
82         CHECK_ENC_GET(32,  5, 0x000f0000, 0x00050000);
83         CHECK_ENC_GET(32,  7, 0x00f00000, 0x00700000);
84         CHECK_ENC_GET(32, 14, 0x0f000000, 0x0e000000);
85         CHECK_ENC_GET(32, 15, 0xf0000000, 0xf0000000);
86
87         CHECK_ENC_GET(64,  1, 0x00000f0000000000ull, 0x0000010000000000ull);
88         CHECK_ENC_GET(64,  3, 0x0000f00000000000ull, 0x0000300000000000ull);
89         CHECK_ENC_GET(64,  5, 0x000f000000000000ull, 0x0005000000000000ull);
90         CHECK_ENC_GET(64,  7, 0x00f0000000000000ull, 0x0070000000000000ull);
91         CHECK_ENC_GET(64, 14, 0x0f00000000000000ull, 0x0e00000000000000ull);
92         CHECK_ENC_GET(64, 15, 0xf000000000000000ull, 0xf000000000000000ull);
93 }
94
95 #define CHECK(tp, mask) do {                                            \
96                 u64 v;                                                  \
97                                                                         \
98                 for (v = 0; v < 1 << hweight32(mask); v++)              \
99                         KUNIT_ASSERT_FALSE(context,                     \
100                                 tp##_encode_bits(v, mask) != v << __ffs64(mask));\
101         } while (0)
102
103 static void __init test_bitfields_variables(struct kunit *context)
104 {
105         CHECK(u8, 0x0f);
106         CHECK(u8, 0xf0);
107         CHECK(u8, 0x38);
108
109         CHECK(u16, 0x0038);
110         CHECK(u16, 0x0380);
111         CHECK(u16, 0x3800);
112         CHECK(u16, 0x8000);
113
114         CHECK(u32, 0x80000000);
115         CHECK(u32, 0x7f000000);
116         CHECK(u32, 0x07e00000);
117         CHECK(u32, 0x00018000);
118
119         CHECK(u64, 0x8000000000000000ull);
120         CHECK(u64, 0x7f00000000000000ull);
121         CHECK(u64, 0x0001800000000000ull);
122         CHECK(u64, 0x0000000080000000ull);
123         CHECK(u64, 0x000000007f000000ull);
124         CHECK(u64, 0x0000000018000000ull);
125         CHECK(u64, 0x0000001f8000000ull);
126 }
127
128 #ifdef TEST_BITFIELD_COMPILE
129 static void __init test_bitfields_compile(struct kunit *context)
130 {
131         /* these should fail compilation */
132         CHECK_ENC_GET(16, 16, 0x0f00, 0x1000);
133         u32_encode_bits(7, 0x06000000);
134
135         /* this should at least give a warning */
136         u16_encode_bits(0, 0x60000);
137 }
138 #endif
139
140 static struct kunit_case __refdata bitfields_test_cases[] = {
141         KUNIT_CASE(test_bitfields_constants),
142         KUNIT_CASE(test_bitfields_variables),
143         {}
144 };
145
146 static struct kunit_suite bitfields_test_suite = {
147         .name = "bitfields",
148         .test_cases = bitfields_test_cases,
149 };
150
151 kunit_test_suites(&bitfields_test_suite);
152
153 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
154 MODULE_LICENSE("GPL");