[mirror_ubuntu-jammy-kernel.git] / lib / test_bitops.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2020 Intel Corporation
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/printk.h>

/* a tiny module only meant to test
 *
 *   set/clear_bit
 *   get_count_order/long
 */

/* use an enum because thats the most common BITMAP usage */
enum bitops_fun {
	BITOPS_4 = 4,
	BITOPS_7 = 7,
	BITOPS_11 = 11,
	BITOPS_31 = 31,
	BITOPS_88 = 88,
	BITOPS_LAST = 255,
	BITOPS_LENGTH = 256
};

static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);

static unsigned int order_comb[][2] = {
	{0x00000003,  2},
	{0x00000004,  2},
	{0x00001fff, 13},
	{0x00002000, 13},
	{0x50000000, 31},
	{0x80000000, 31},
	{0x80003000, 32},
};

#ifdef CONFIG_64BIT
static unsigned long order_comb_long[][2] = {
	{0x0000000300000000, 34},
	{0x0000000400000000, 34},
	{0x00001fff00000000, 45},
	{0x0000200000000000, 45},
	{0x5000000000000000, 63},
	{0x8000000000000000, 63},
	{0x8000300000000000, 64},
};
#endif

static int __init test_bitops_startup(void)
{
	int i, bit_set;

	pr_info("Starting bitops test\n");
	set_bit(BITOPS_4, g_bitmap);
	set_bit(BITOPS_7, g_bitmap);
	set_bit(BITOPS_11, g_bitmap);
	set_bit(BITOPS_31, g_bitmap);
	set_bit(BITOPS_88, g_bitmap);

	for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
		if (order_comb[i][1] != get_count_order(order_comb[i][0]))
			pr_warn("get_count_order wrong for %x\n",
				       order_comb[i][0]);
	}

	for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
		if (order_comb[i][1] != get_count_order_long(order_comb[i][0]))
			pr_warn("get_count_order_long wrong for %x\n",
				       order_comb[i][0]);
	}

#ifdef CONFIG_64BIT
	for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) {
		if (order_comb_long[i][1] !=
			       get_count_order_long(order_comb_long[i][0]))
			pr_warn("get_count_order_long wrong for %lx\n",
				       order_comb_long[i][0]);
	}
#endif

	barrier();

	clear_bit(BITOPS_4, g_bitmap);
	clear_bit(BITOPS_7, g_bitmap);
	clear_bit(BITOPS_11, g_bitmap);
	clear_bit(BITOPS_31, g_bitmap);
	clear_bit(BITOPS_88, g_bitmap);

	bit_set = find_first_bit(g_bitmap, BITOPS_LAST);
	if (bit_set != BITOPS_LAST)
		pr_err("ERROR: FOUND SET BIT %d\n", bit_set);

	pr_info("Completed bitops test\n");

	return 0;
}

static void __exit test_bitops_unstartup(void)
{
}

module_init(test_bitops_startup);
module_exit(test_bitops_unstartup);

MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Bit testing module");
Commit	Line	Data
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)
c348c163 JB	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");
c348c163 JB	111	MODULE_DESCRIPTION("Bit testing module");