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authorAkinobu Mita <akinobu.mita@gmail.com>2012-09-08 01:48:10 +0900
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-09-29 15:48:02 +0100
commit6ed089c0a1bc6f371dbcf97fb4e8218deaa0ae17 (patch)
tree25254895560a1c0a8997928b2dbd0f12bc6eb9ae /drivers/mtd/tests
parent200ab8454c42c607efd281b2c2398624eccdd2cc (diff)
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>
Diffstat (limited to 'drivers/mtd/tests')
-rw-r--r--drivers/mtd/tests/mtd_nandecctest.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/mtd/tests/mtd_nandecctest.c b/drivers/mtd/tests/mtd_nandecctest.c
index caaeb64acdea..b437fa425077 100644
--- a/drivers/mtd/tests/mtd_nandecctest.c
+++ b/drivers/mtd/tests/mtd_nandecctest.c
@@ -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,