static int nand_ecc_test(const size_t size)
{
unsigned char code[3];
unsigned char error_code[3];
char testname[30];
BUG_ON(sizeof(data) < size);
sprintf(testname, "nand-ecc-%zu", size);
get_random_bytes(data, size);
memcpy(error_data, data, size);
inject_single_bit_error(error_data, size);
__nand_calculate_ecc(data, size, code);
__nand_calculate_ecc(error_data, size, error_code);
__nand_correct_data(error_data, code, error_code, size);
if (!memcmp(data, error_data, size)) {
printk(KERN_INFO "mtd_nandecctest: ok - %s\n", testname);
return 0;
}
printk(KERN_ERR "mtd_nandecctest: not ok - %s\n", testname);
printk(KERN_DEBUG "hexdump of data:\n");
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
data, size, false);
printk(KERN_DEBUG "hexdump of error data:\n");
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
error_data, size, false);
return -1;
}
static int double_bit_error_detect(void *error_data, void *error_ecc,
void *correct_data, const size_t size)
{
unsigned char calc_ecc[3];
int ret;
__nand_calculate_ecc(error_data, size, calc_ecc);
ret = __nand_correct_data(error_data, error_ecc, calc_ecc, size);
return (ret == -EBADMSG) ? 0 : -EINVAL;
}
static int single_bit_error_correct(void *error_data, void *error_ecc,
void *correct_data, const size_t size)
{
unsigned char calc_ecc[3];
int ret;
__nand_calculate_ecc(error_data, size, calc_ecc);
ret = __nand_correct_data(error_data, error_ecc, calc_ecc, size);
if (ret == 1 && !memcmp(correct_data, error_data, size))
return 0;
return -EINVAL;
}
static int nand_ecc_test_run(const size_t size)
{
int i;
int err = 0;
void *error_data;
void *error_ecc;
void *correct_data;
void *correct_ecc;
error_data = kmalloc(size, GFP_KERNEL);
error_ecc = kmalloc(3, GFP_KERNEL);
correct_data = kmalloc(size, GFP_KERNEL);
correct_ecc = kmalloc(3, GFP_KERNEL);
if (!error_data || !error_ecc || !correct_data || !correct_ecc) {
err = -ENOMEM;
goto error;
}
prandom_bytes(correct_data, size);
__nand_calculate_ecc(correct_data, size, correct_ecc);
for (i = 0; i < ARRAY_SIZE(nand_ecc_test); i++) {
nand_ecc_test[i].prepare(error_data, error_ecc,
correct_data, correct_ecc, size);
err = nand_ecc_test[i].verify(error_data, error_ecc,
correct_data, size);
if (err) {
pr_err("not ok - %s-%zd\n",
nand_ecc_test[i].name, size);
dump_data_ecc(error_data, error_ecc,
correct_data, correct_ecc, size);
break;
}
pr_info("ok - %s-%zd\n",
nand_ecc_test[i].name, size);
err = mtdtest_relax();
if (err)
break;
}
error:
kfree(error_data);
kfree(error_ecc);
kfree(correct_data);
kfree(correct_ecc);
return err;
}
