crypto: arm64/crc32 - add non-SIMD scalar fallback - kernel/git/torvalds/linux.git - Linux kernel source tree
- ️Mon Jul 24 2017
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-07-24 11:28:07 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-04 09:27:17 +0800 |
| commit | 15c7d8f8a2c7c86cb36f4d0273a1b2b2c9a479d7 (patch) | |
| tree | e1f7cc5d7178662e82431b4471eab05784323e87 | |
| parent | 2dde374e1ff0663ca46b343949c242959028f976 (diff) | |
| download | linux-15c7d8f8a2c7c86cb36f4d0273a1b2b2c9a479d7.tar.gz |
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>
| -rw-r--r-- | arch/arm64/crypto/crc32-ce-glue.c | 11 |
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 eccb1ae9006410..624f4137918ce5 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();