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crypto: arm64/sha512-ce - yield NEON after every block of input 

Avoid excessive scheduling delays under a preemptible kernel by
conditionally yielding the NEON after every block of input.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2018-04-30 18:18:30 +02:00 committed by Herbert Xu
parent 7edc86cb1c
commit 6caf7adc5e
1 changed files with 21 additions and 6 deletions
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27
arch/arm64/crypto/sha512-ce-core.S
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@ -107,17 +107,23 @@
*/
.text
ENTRY(sha512_ce_transform)
frame_push 3
mov x19, x0
mov x20, x1
mov x21, x2
/* load state */
ld1 {v8.2d-v11.2d}, [x0]
0: ld1 {v8.2d-v11.2d}, [x19]
/* load first 4 round constants */
adr_l x3, .Lsha512_rcon
ld1 {v20.2d-v23.2d}, [x3], #64
/* load input */
0: ld1 {v12.2d-v15.2d}, [x1], #64
ld1 {v16.2d-v19.2d}, [x1], #64
sub w2, w2, #1
1: ld1 {v12.2d-v15.2d}, [x20], #64
ld1 {v16.2d-v19.2d}, [x20], #64
sub w21, w21, #1
CPU_LE( rev64 v12.16b, v12.16b )
CPU_LE( rev64 v13.16b, v13.16b )
@ -196,9 +202,18 @@ CPU_LE( rev64 v19.16b, v19.16b )
add v11.2d, v11.2d, v3.2d
/* handled all input blocks? */
cbnz w2, 0b
cbz w21, 3f
if_will_cond_yield_neon
st1 {v8.2d-v11.2d}, [x19]
do_cond_yield_neon
b 0b
endif_yield_neon
b 1b
/* store new state */
3: st1 {v8.2d-v11.2d}, [x0]
3: st1 {v8.2d-v11.2d}, [x19]
frame_pop
ret
ENDPROC(sha512_ce_transform)