Commit 2dde374e authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Herbert Xu

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
/*
* 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;
......
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