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mtd: mtd_nandecctest: add double bit error detection tests 

This adds the double bit error detection test cases listed below:

* Prepare data block with double bit error and ECC data without
corruption, and verify that the uncorrectable error is detected by
__nand_correct_data().

* Prepare data block with single bit error and ECC data with single bit
error, and verify that the uncorrectable error is detected.

* Prepare data block without corruption and ECC data with double bit
error, and verify that the uncorrectable error is detected.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Akinobu Mita 2012-09-08 01:48:10 +09:00 committed by David Woodhouse
parent 200ab8454c
commit 6ed089c0a1
1 changed files with 79 additions and 0 deletions
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79
drivers/mtd/tests/mtd_nandecctest.c
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@ -48,6 +48,22 @@ static void single_bit_error_data(void *error_data, void *correct_data,
__change_bit_le(offset, error_data);
}
static void double_bit_error_data(void *error_data, void *correct_data,
size_t size)
{
unsigned int offset[2];
offset[0] = random32() % (size * BITS_PER_BYTE);
do {
offset[1] = random32() % (size * BITS_PER_BYTE);
} while (offset[0] == offset[1]);
memcpy(error_data, correct_data, size);
__change_bit_le(offset[0], error_data);
__change_bit_le(offset[1], error_data);
}
static unsigned int random_ecc_bit(size_t size)
{
unsigned int offset = random32() % (3 * BITS_PER_BYTE);
@ -73,6 +89,21 @@ static void single_bit_error_ecc(void *error_ecc, void *correct_ecc,
__change_bit_le(offset, error_ecc);
}
static void double_bit_error_ecc(void *error_ecc, void *correct_ecc,
size_t size)
{
unsigned int offset[2];
offset[0] = random_ecc_bit(size);
do {
offset[1] = random_ecc_bit(size);
} while (offset[0] == offset[1]);
memcpy(error_ecc, correct_ecc, 3);
__change_bit_le(offset[0], error_ecc);
__change_bit_le(offset[1], error_ecc);
}
static void no_bit_error(void *error_data, void *error_ecc,
void *correct_data, void *correct_ecc, const size_t size)
{
@ -122,6 +153,39 @@ static int single_bit_error_correct(void *error_data, void *error_ecc,
return -EINVAL;
}
static void double_bit_error_in_data(void *error_data, void *error_ecc,
void *correct_data, void *correct_ecc, const size_t size)
{
double_bit_error_data(error_data, correct_data, size);
memcpy(error_ecc, correct_ecc, 3);
}
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)
{
single_bit_error_data(error_data, correct_data, size);
single_bit_error_ecc(error_ecc, correct_ecc, size);
}
static void double_bit_error_in_ecc(void *error_data, void *error_ecc,
void *correct_data, void *correct_ecc, const size_t size)
{
memcpy(error_data, correct_data, size);
double_bit_error_ecc(error_ecc, correct_ecc, size);
}
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 == -1) ? 0 : -EINVAL;
}
static const struct nand_ecc_test nand_ecc_test[] = {
{
.name = "no-bit-error",
@ -138,6 +202,21 @@ static const struct nand_ecc_test nand_ecc_test[] = {
.prepare = single_bit_error_in_ecc,
.verify = single_bit_error_correct,
},
{
.name = "double-bit-error-in-data-detect",
.prepare = double_bit_error_in_data,
.verify = double_bit_error_detect,
},
{
.name = "single-bit-error-in-data-and-ecc-detect",
.prepare = single_bit_error_in_data_and_ecc,
.verify = double_bit_error_detect,
},
{
.name = "double-bit-error-in-ecc-detect",
.prepare = double_bit_error_in_ecc,
.verify = double_bit_error_detect,
},
};
static void dump_data_ecc(void *error_data, void *error_ecc, void *correct_data,