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
12 /* a tiny module only meant to test
13 *
14 * set/clear_bit
15 * get_count_order/long
16 */
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
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
test_bitops_startup(void)53 static int __init test_bitops_startup(void)
54 {
55 int i, bit_set;
56
57 pr_info("Starting bitops test\n");
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);
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
84
85 barrier();
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
97 pr_info("Completed bitops test\n");
98
99 return 0;
100 }
101
test_bitops_unstartup(void)102 static void __exit test_bitops_unstartup(void)
103 {
104 }
105
106 module_init(test_bitops_startup);
107 module_exit(test_bitops_unstartup);
108
109 MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>");
110 MODULE_LICENSE("GPL");
111 MODULE_DESCRIPTION("Bit testing module");
112
