aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm64/crypto
diff options
context:
space:
mode:
authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-07-24 11:28:07 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2017-08-04 09:27:17 +0800
commit15c7d8f8a2c7c86cb36f4d0273a1b2b2c9a479d7 (patch)
treee1f7cc5d7178662e82431b4471eab05784323e87 /arch/arm64/crypto
parentcrypto: arm64/crct10dif - add non-SIMD generic fallback (diff)
downloadlinux-dev-15c7d8f8a2c7c86cb36f4d0273a1b2b2c9a479d7.tar.xz
linux-dev-15c7d8f8a2c7c86cb36f4d0273a1b2b2c9a479d7.zip
crypto: arm64/crc32 - add non-SIMD scalar 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/crc32-ce-glue.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/arm64/crypto/crc32-ce-glue.c b/arch/arm64/crypto/crc32-ce-glue.c
index eccb1ae90064..624f4137918c 100644
--- a/arch/arm64/crypto/crc32-ce-glue.c
+++ b/arch/arm64/crypto/crc32-ce-glue.c
@@ -1,7 +1,7 @@
/*
* Accelerated CRC32(C) 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
@@ -19,6 +19,7 @@
#include <asm/hwcap.h>
#include <asm/neon.h>
+#include <asm/simd.h>
#include <asm/unaligned.h>
#define PMULL_MIN_LEN 64L /* minimum size of buffer
@@ -105,10 +106,10 @@ static int crc32_pmull_update(struct shash_desc *desc, const u8 *data,
length -= l;
}
- if (length >= PMULL_MIN_LEN) {
+ if (length >= PMULL_MIN_LEN && may_use_simd()) {
l = round_down(length, SCALE_F);
- kernel_neon_begin_partial(10);
+ kernel_neon_begin();
*crc = crc32_pmull_le(data, l, *crc);
kernel_neon_end();
@@ -137,10 +138,10 @@ static int crc32c_pmull_update(struct shash_desc *desc, const u8 *data,
length -= l;
}
- if (length >= PMULL_MIN_LEN) {
+ if (length >= PMULL_MIN_LEN && may_use_simd()) {
l = round_down(length, SCALE_F);
- kernel_neon_begin_partial(10);
+ kernel_neon_begin();
*crc = crc32c_pmull_le(data, l, *crc);
kernel_neon_end();