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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-07-24 11:28:06 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-04 09:27:16 +0800 |
| commit | 2dde374e1ff0663ca46b343949c242959028f976 (patch) | |
| tree | a6b9fc1f0a3a7f6be7ace44e3dcced23ccf194a9 /arch | |
| parent | 6d6254d728a2e696aa697b4b44cb7736851f62e3 (diff) | |
| download | linux-2dde374e1ff0663ca46b343949c242959028f976.tar.gz linux-2dde374e1ff0663ca46b343949c242959028f976.tar.bz2 linux-2dde374e1ff0663ca46b343949c242959028f976.zip | |
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: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/crypto/crct10dif-ce-glue.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/arm64/crypto/crct10dif-ce-glue.c b/arch/arm64/crypto/crct10dif-ce-glue.c index 60cb590c2590..96f0cae4a022 100644 --- a/arch/arm64/crypto/crct10dif-ce-glue.c +++ b/arch/arm64/crypto/crct10dif-ce-glue.c @@ -1,7 +1,7 @@ /* * 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); - *crc = crc_t10dif_pmull(*crc, data, length); - kernel_neon_end(); + 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; |