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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-04-30 18:18:21 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-05-12 00:13:05 +0800 |
| commit | 7df8d164753e6e6f229b72767595072bc6a71f48 (patch) | |
| tree | 336ea06ff8d37d4131bc05ec46fef7f4f871f491 /arch/arm64 | |
| parent | 158b52ff1436cf794778774e8510cd42e773849c (diff) | |
| download | linux-0-day-7df8d164753e6e6f229b72767595072bc6a71f48.tar.gz linux-0-day-7df8d164753e6e6f229b72767595072bc6a71f48.tar.xz | |
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>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/crypto/sha1-ce-core.S | 42 |
1 files changed, 29 insertions, 13 deletions
diff --git a/arch/arm64/crypto/sha1-ce-core.S b/arch/arm64/crypto/sha1-ce-core.S index 46049850727de..78eb35fb50560 100644 --- a/arch/arm64/crypto/sha1-ce-core.S +++ b/arch/arm64/crypto/sha1-ce-core.S @@ -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) |