linux/drivers/mtd/tests/mtd_nandecctest.c

// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/random.h>
#include <linux/string.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/mtd/nand-ecc-sw-hamming.h>

#include "mtd_test.h"

/*
 * Test the implementation for software ECC
 *
 * No actual MTD device is needed, So we don't need to warry about losing
 * important data by human error.
 *
 * This covers possible patterns of corruption which can be reliably corrected
 * or detected.
 */

#if IS_ENABLED(CONFIG_MTD_RAW_NAND)

struct nand_ecc_test { … };

/*
 * The reason for this __change_bit_le() instead of __change_bit() is to inject
 * bit error properly within the region which is not a multiple of
 * sizeof(unsigned long) on big-endian systems
 */
#ifdef __LITTLE_ENDIAN
#define __change_bit_le(nr, addr) …
#elif defined(__BIG_ENDIAN)
#define __change_bit_le …
#else
#error "Unknown byte order"
#endif

static void single_bit_error_data(void *error_data, void *correct_data,
				size_t size)
{ … }

static void double_bit_error_data(void *error_data, void *correct_data,
				size_t size)
{ … }

static unsigned int random_ecc_bit(size_t size)
{ … }

static void single_bit_error_ecc(void *error_ecc, void *correct_ecc,
				size_t size)
{ … }

static void double_bit_error_ecc(void *error_ecc, void *correct_ecc,
				size_t size)
{ … }

static void no_bit_error(void *error_data, void *error_ecc,
		void *correct_data, void *correct_ecc, const size_t size)
{ … }

static int no_bit_error_verify(void *error_data, void *error_ecc,
				void *correct_data, const size_t size)
{ … }

static void single_bit_error_in_data(void *error_data, void *error_ecc,
		void *correct_data, void *correct_ecc, const size_t size)
{ … }

static void single_bit_error_in_ecc(void *error_data, void *error_ecc,
		void *correct_data, void *correct_ecc, const size_t size)
{ … }

static int single_bit_error_correct(void *error_data, void *error_ecc,
				void *correct_data, const size_t size)
{ … }

static void double_bit_error_in_data(void *error_data, void *error_ecc,
		void *correct_data, void *correct_ecc, const size_t size)
{ … }

static void single_bit_error_in_data_and_ecc(void *error_data, void *error_ecc,
		void *correct_data, void *correct_ecc, const size_t size)
{ … }

static void double_bit_error_in_ecc(void *error_data, void *error_ecc,
		void *correct_data, void *correct_ecc, const size_t size)
{ … }

static int double_bit_error_detect(void *error_data, void *error_ecc,
				void *correct_data, const size_t size)
{ … }

static const struct nand_ecc_test nand_ecc_test[] = …;

static void dump_data_ecc(void *error_data, void *error_ecc, void *correct_data,
			void *correct_ecc, const size_t size)
{ … }

static int nand_ecc_test_run(const size_t size)
{ … }

#else

static int nand_ecc_test_run(const size_t size)
{
	return 0;
}

#endif

static int __init ecc_test_init(void)
{ … }

static void __exit ecc_test_exit(void)
{ … }

module_init(ecc_test_init);
module_exit(ecc_test_exit);

MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;