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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-07-24 11:28:06 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2017-08-04 09:27:16 +0800
commit2dde374e1ff0663ca46b343949c242959028f976 (patch)
treea6b9fc1f0a3a7f6be7ace44e3dcced23ccf194a9 /arch/arm64/crypto
parentcrypto: arm64/ghash-ce - add non-SIMD scalar fallback (diff)
downloadlinux-dev-2dde374e1ff0663ca46b343949c242959028f976.tar.xz
linux-dev-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/arm64/crypto')
-rw-r--r--arch/arm64/crypto/crct10dif-ce-glue.c13
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;