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6d575f11c7
Since commitaefbab8e77("arm64: fpsimd: Preserve/restore kernel mode NEON at context switch"), kernel-mode NEON sections have been preemptible on arm64. And since commit7dadeaa6e8("sched: Further restrict the preemption modes"), voluntary preemption is no longer supported on arm64 either. Therefore, there's no longer any need to limit the length of kernel-mode NEON sections on arm64. Simplify the SHA-3 code accordingly. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20260401000548.133151-9-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/simd.h>
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#include <linux/cpufeature.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha3);
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asmlinkage void sha3_ce_transform(struct sha3_state *state, const u8 *data,
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size_t nblocks, size_t block_size);
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static void sha3_absorb_blocks(struct sha3_state *state, const u8 *data,
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size_t nblocks, size_t block_size)
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{
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if (static_branch_likely(&have_sha3) && likely(may_use_simd())) {
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scoped_ksimd()
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sha3_ce_transform(state, data, nblocks, block_size);
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} else {
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sha3_absorb_blocks_generic(state, data, nblocks, block_size);
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}
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}
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static void sha3_keccakf(struct sha3_state *state)
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{
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if (static_branch_likely(&have_sha3) && likely(may_use_simd())) {
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/*
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* Passing zeroes into sha3_ce_transform() gives the plain
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* Keccak-f permutation, which is what we want here. Any
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* supported block size may be used. Use SHA3_512_BLOCK_SIZE
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* since it's the shortest.
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*/
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static const u8 zeroes[SHA3_512_BLOCK_SIZE];
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scoped_ksimd()
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sha3_ce_transform(state, zeroes, 1, sizeof(zeroes));
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} else {
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sha3_keccakf_generic(state);
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}
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}
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#define sha3_mod_init_arch sha3_mod_init_arch
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static void sha3_mod_init_arch(void)
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{
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if (cpu_have_named_feature(SHA3))
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static_branch_enable(&have_sha3);
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}
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