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Commit 200ab845 authored by Akinobu Mita's avatar Akinobu Mita Committed by David Woodhouse
Browse files

mtd: mtd_nandecctest: add single bit error correction test 



This adds the single bit error correction test case listed below:

Prepare data block without corruption and ECC data with single bit error,
and verify that the data block is preserved by __nand_correct_data().

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 ccaa6795

drivers/mtd/tests/mtd_nandecctest.c

+37 −0
Original line number Diff line number Diff line
@@ -48,6 +48,31 @@ static void single_bit_error_data(void *error_data, void *correct_data, 
	__change_bit_le(offset, error_data);

}



static unsigned int random_ecc_bit(size_t size)

{

	unsigned int offset = random32() % (3 * BITS_PER_BYTE);



	if (size == 256) {

		/*

		 * Don't inject a bit error into the insignificant bits (16th

		 * and 17th bit) in ECC code for 256 byte data block

		 */

		while (offset == 16 || offset == 17)

			offset = random32() % (3 * BITS_PER_BYTE);

	}



	return offset;

}



static void single_bit_error_ecc(void *error_ecc, void *correct_ecc,

				size_t size)

{

	unsigned int offset = random_ecc_bit(size);



	memcpy(error_ecc, correct_ecc, 3);

	__change_bit_le(offset, error_ecc);

}



static void no_bit_error(void *error_data, void *error_ecc,

		void *correct_data, void *correct_ecc, const size_t size)

{
@@ -76,6 +101,13 @@ static void single_bit_error_in_data(void *error_data, void *error_ecc, 
	memcpy(error_ecc, correct_ecc, 3);

}



static void single_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);

	single_bit_error_ecc(error_ecc, correct_ecc, size);

}



static int single_bit_error_correct(void *error_data, void *error_ecc,

				void *correct_data, const size_t size)

{
@@ -101,6 +133,11 @@ static const struct nand_ecc_test nand_ecc_test[] = { 
		.prepare = single_bit_error_in_data,

		.verify = single_bit_error_correct,

	},

	{

		.name = "single-bit-error-in-ecc-correct",

		.prepare = single_bit_error_in_ecc,

		.verify = single_bit_error_correct,

	},

};



static void dump_data_ecc(void *error_data, void *error_ecc, void *correct_data,