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Commit 6ed089c0 authored by Akinobu Mita's avatar Akinobu Mita Committed by David Woodhouse
Browse files

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: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 200ab845

drivers/mtd/tests/mtd_nandecctest.c

+79 −0
Original line number Diff line number Diff line
@@ -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,