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c348c163 JB |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Copyright (C) 2020 Intel Corporation | |
4 | */ | |
5 | ||
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/printk.h> | |
11 | ||
6af132f3 WY |
12 | /* a tiny module only meant to test |
13 | * | |
14 | * set/clear_bit | |
15 | * get_count_order/long | |
16 | */ | |
c348c163 JB |
17 | |
18 | /* use an enum because thats the most common BITMAP usage */ | |
19 | enum bitops_fun { | |
20 | BITOPS_4 = 4, | |
21 | BITOPS_7 = 7, | |
22 | BITOPS_11 = 11, | |
23 | BITOPS_31 = 31, | |
24 | BITOPS_88 = 88, | |
25 | BITOPS_LAST = 255, | |
26 | BITOPS_LENGTH = 256 | |
27 | }; | |
28 | ||
29 | static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH); | |
30 | ||
6af132f3 WY |
31 | static unsigned int order_comb[][2] = { |
32 | {0x00000003, 2}, | |
33 | {0x00000004, 2}, | |
34 | {0x00001fff, 13}, | |
35 | {0x00002000, 13}, | |
36 | {0x50000000, 31}, | |
37 | {0x80000000, 31}, | |
38 | {0x80003000, 32}, | |
39 | }; | |
40 | ||
41 | #ifdef CONFIG_64BIT | |
42 | static unsigned long order_comb_long[][2] = { | |
43 | {0x0000000300000000, 34}, | |
44 | {0x0000000400000000, 34}, | |
45 | {0x00001fff00000000, 45}, | |
46 | {0x0000200000000000, 45}, | |
47 | {0x5000000000000000, 63}, | |
48 | {0x8000000000000000, 63}, | |
49 | {0x8000300000000000, 64}, | |
50 | }; | |
51 | #endif | |
52 | ||
c348c163 JB |
53 | static int __init test_bitops_startup(void) |
54 | { | |
403f1773 | 55 | int i, bit_set; |
6af132f3 | 56 | |
403f1773 | 57 | pr_info("Starting bitops test\n"); |
c348c163 JB |
58 | set_bit(BITOPS_4, g_bitmap); |
59 | set_bit(BITOPS_7, g_bitmap); | |
60 | set_bit(BITOPS_11, g_bitmap); | |
61 | set_bit(BITOPS_31, g_bitmap); | |
62 | set_bit(BITOPS_88, g_bitmap); | |
6af132f3 WY |
63 | |
64 | for (i = 0; i < ARRAY_SIZE(order_comb); i++) { | |
65 | if (order_comb[i][1] != get_count_order(order_comb[i][0])) | |
66 | pr_warn("get_count_order wrong for %x\n", | |
67 | order_comb[i][0]); | |
68 | } | |
69 | ||
70 | for (i = 0; i < ARRAY_SIZE(order_comb); i++) { | |
71 | if (order_comb[i][1] != get_count_order_long(order_comb[i][0])) | |
72 | pr_warn("get_count_order_long wrong for %x\n", | |
73 | order_comb[i][0]); | |
74 | } | |
75 | ||
76 | #ifdef CONFIG_64BIT | |
77 | for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) { | |
78 | if (order_comb_long[i][1] != | |
79 | get_count_order_long(order_comb_long[i][0])) | |
80 | pr_warn("get_count_order_long wrong for %lx\n", | |
81 | order_comb_long[i][0]); | |
82 | } | |
83 | #endif | |
c348c163 | 84 | |
403f1773 | 85 | barrier(); |
c348c163 JB |
86 | |
87 | clear_bit(BITOPS_4, g_bitmap); | |
88 | clear_bit(BITOPS_7, g_bitmap); | |
89 | clear_bit(BITOPS_11, g_bitmap); | |
90 | clear_bit(BITOPS_31, g_bitmap); | |
91 | clear_bit(BITOPS_88, g_bitmap); | |
92 | ||
93 | bit_set = find_first_bit(g_bitmap, BITOPS_LAST); | |
94 | if (bit_set != BITOPS_LAST) | |
95 | pr_err("ERROR: FOUND SET BIT %d\n", bit_set); | |
96 | ||
403f1773 GU |
97 | pr_info("Completed bitops test\n"); |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static void __exit test_bitops_unstartup(void) | |
103 | { | |
c348c163 JB |
104 | } |
105 | ||
106 | module_init(test_bitops_startup); | |
107 | module_exit(test_bitops_unstartup); | |
108 | ||
6af132f3 | 109 | MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>"); |
c348c163 JB |
110 | MODULE_LICENSE("GPL"); |
111 | MODULE_DESCRIPTION("Bit testing module"); |