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Commit 2dde374e authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Herbert Xu
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crypto: arm64/crct10dif - add non-SIMD generic fallback 



The arm64 kernel will shortly disallow nested kernel mode NEON, so
add a fallback to scalar C code that can be invoked in that case.

Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 6d6254d7

arch/arm64/crypto/crct10dif-ce-glue.c

+9 −4
Original line number Diff line number Diff line 
/*

 * Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions

 *

 * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>

 * Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as
@@ -18,6 +18,7 @@ 
#include <crypto/internal/hash.h>



#include <asm/neon.h>

#include <asm/simd.h>



#define CRC_T10DIF_PMULL_CHUNK_SIZE	16U
@@ -48,9 +49,13 @@ static int crct10dif_update(struct shash_desc *desc, const u8 *data, 
	}



	if (length > 0) {

		kernel_neon_begin_partial(14);

		if (may_use_simd()) {

			kernel_neon_begin();

			*crc = crc_t10dif_pmull(*crc, data, length);

			kernel_neon_end();

		} else {

			*crc = crc_t10dif_generic(*crc, data, length);

		}

	}



	return 0;