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 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 } 101 102 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