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UPSTREAM: crypto: arm64/aes-neonbs - remove NEON yield calls

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There is no need for elaborate yield handling in the bit-sliced NEON
implementation of AES, given that skciphers are naturally bounded by the
size of the chunks returned by the skcipher_walk API. So remove the
yield calls from the asm code.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit f5943ef456)
Bug: 153614920
Change-Id: I4af32d733d28b5bc716d45e33d56be6a1bbba4e8
Signed-off-by: Ard Biesheuvel <ardb@google.com>
This commit is contained in:
Ard Biesheuvel 2021-02-03 12:36:23 +01:00 • committed by Ard Biesheuvel
commit 4e2acf6395
1 changed files with 2 additions and 6 deletions
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8
arch/arm64/crypto/aes-neonbs-core.S
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@ -613,7 +613,6 @@ SYM_FUNC_END(aesbs_decrypt8)
st1 {\o7\().16b}, [x19], #16
cbz x23, 1f
cond_yield_neon
b 99b
1: frame_pop
@ -715,7 +714,6 @@ SYM_FUNC_START(aesbs_cbc_decrypt)
1: st1 {v24.16b}, [x24] // store IV
cbz x23, 2f
cond_yield_neon
b 99b
2: frame_pop
@ -801,7 +799,7 @@ SYM_FUNC_END(__xts_crypt8)
mov x23, x4
mov x24, x5
0: movi v30.2s, #0x1
movi v30.2s, #0x1
movi v25.2s, #0x87
uzp1 v30.4s, v30.4s, v25.4s
ld1 {v25.16b}, [x24]
@ -846,7 +844,6 @@ SYM_FUNC_END(__xts_crypt8)
cbz x23, 1f
st1 {v25.16b}, [x24]
cond_yield_neon 0b
b 99b
1: st1 {v25.16b}, [x24]
@ -889,7 +886,7 @@ SYM_FUNC_START(aesbs_ctr_encrypt)
cset x26, ne
add x23, x23, x26 // do one extra block if final
98: ldp x7, x8, [x24]
ldp x7, x8, [x24]
ld1 {v0.16b}, [x24]
CPU_LE( rev x7, x7 )
CPU_LE( rev x8, x8 )
@ -967,7 +964,6 @@ CPU_LE( rev x8, x8 )
st1 {v0.16b}, [x24]
cbz x23, .Lctr_done
cond_yield_neon 98b
b 99b
.Lctr_done: