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crypto: arm64/sha1-ce - yield NEON after every block of input 

Avoid excessive scheduling delays under a preemptible kernel by
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 18:18:21 +02:00 committed by Herbert Xu
parent 158b52ff14
commit 7df8d16475
1 changed files with 29 additions and 13 deletions
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42
arch/arm64/crypto/sha1-ce-core.S
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@ -69,30 +69,36 @@
* int blocks)
*/
ENTRY(sha1_ce_transform)
frame_push 3
mov x19, x0
mov x20, x1
mov x21, x2
/* load round constants */
loadrc k0.4s, 0x5a827999, w6
0: loadrc k0.4s, 0x5a827999, w6
loadrc k1.4s, 0x6ed9eba1, w6
loadrc k2.4s, 0x8f1bbcdc, w6
loadrc k3.4s, 0xca62c1d6, w6
/* load state */
ld1 {dgav.4s}, [x0]
ldr dgb, [x0, #16]
ld1 {dgav.4s}, [x19]
ldr dgb, [x19, #16]
/* load sha1_ce_state::finalize */
ldr_l w4, sha1_ce_offsetof_finalize, x4
ldr w4, [x0, x4]
ldr w4, [x19, x4]
/* load input */
0: ld1 {v8.4s-v11.4s}, [x1], #64
sub w2, w2, #1
1: ld1 {v8.4s-v11.4s}, [x20], #64
sub w21, w21, #1
CPU_LE( rev32 v8.16b, v8.16b )
CPU_LE( rev32 v9.16b, v9.16b )
CPU_LE( rev32 v10.16b, v10.16b )
CPU_LE( rev32 v11.16b, v11.16b )
1: add t0.4s, v8.4s, k0.4s
2: add t0.4s, v8.4s, k0.4s
mov dg0v.16b, dgav.16b
add_update c, ev, k0, 8, 9, 10, 11, dgb
@ -123,16 +129,25 @@ CPU_LE( rev32 v11.16b, v11.16b )
add dgbv.2s, dgbv.2s, dg1v.2s
add dgav.4s, dgav.4s, dg0v.4s
cbnz w2, 0b
cbz w21, 3f
if_will_cond_yield_neon
st1 {dgav.4s}, [x19]
str dgb, [x19, #16]
do_cond_yield_neon
b 0b
endif_yield_neon
b 1b
/*
* Final block: add padding and total bit count.
* Skip if the input size was not a round multiple of the block size,
* the padding is handled by the C code in that case.
*/
cbz x4, 3f
3: cbz x4, 4f
ldr_l w4, sha1_ce_offsetof_count, x4
ldr x4, [x0, x4]
ldr x4, [x19, x4]
movi v9.2d, #0
mov x8, #0x80000000
movi v10.2d, #0
@ -141,10 +156,11 @@ CPU_LE( rev32 v11.16b, v11.16b )
mov x4, #0
mov v11.d[0], xzr
mov v11.d[1], x7
b 1b
b 2b
/* store new state */
3: st1 {dgav.4s}, [x0]
str dgb, [x0, #16]
4: st1 {dgav.4s}, [x19]
str dgb, [x19, #16]
frame_pop
ret
ENDPROC(sha1_ce_transform)