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f53d18a4e6
Before modifying the prototypes of kernel_neon_begin() and kernel_neon_end() to accommodate kernel mode FP/SIMD state buffers allocated on the stack, move arm64 to the new 'ksimd' scoped guard API, which encapsulates the calls to those functions. For symmetry, do the same for 32-bit ARM too. Reviewed-by: Eric Biggers <ebiggers@kernel.org> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* ChaCha and HChaCha functions (ARM64 optimized)
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*
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* Copyright (C) 2016 - 2017 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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* Based on:
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* ChaCha20 256-bit cipher algorithm, RFC7539, SIMD glue code
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*
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* Copyright (C) 2015 Martin Willi
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <crypto/internal/simd.h>
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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#include <asm/hwcap.h>
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#include <asm/simd.h>
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asmlinkage void chacha_block_xor_neon(const struct chacha_state *state,
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u8 *dst, const u8 *src, int nrounds);
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asmlinkage void chacha_4block_xor_neon(const struct chacha_state *state,
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u8 *dst, const u8 *src,
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int nrounds, int bytes);
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asmlinkage void hchacha_block_neon(const struct chacha_state *state,
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u32 out[HCHACHA_OUT_WORDS], int nrounds);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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static void chacha_doneon(struct chacha_state *state, u8 *dst, const u8 *src,
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int bytes, int nrounds)
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{
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while (bytes > 0) {
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int l = min(bytes, CHACHA_BLOCK_SIZE * 5);
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if (l <= CHACHA_BLOCK_SIZE) {
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u8 buf[CHACHA_BLOCK_SIZE];
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memcpy(buf, src, l);
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chacha_block_xor_neon(state, buf, buf, nrounds);
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memcpy(dst, buf, l);
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state->x[12] += 1;
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break;
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}
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chacha_4block_xor_neon(state, dst, src, nrounds, l);
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bytes -= l;
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src += l;
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dst += l;
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state->x[12] += DIV_ROUND_UP(l, CHACHA_BLOCK_SIZE);
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}
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}
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static void hchacha_block_arch(const struct chacha_state *state,
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u32 out[HCHACHA_OUT_WORDS], int nrounds)
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{
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if (!static_branch_likely(&have_neon) || !crypto_simd_usable()) {
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hchacha_block_generic(state, out, nrounds);
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} else {
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scoped_ksimd()
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hchacha_block_neon(state, out, nrounds);
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}
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}
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static void chacha_crypt_arch(struct chacha_state *state, u8 *dst,
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const u8 *src, unsigned int bytes, int nrounds)
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{
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if (!static_branch_likely(&have_neon) || bytes <= CHACHA_BLOCK_SIZE ||
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!crypto_simd_usable())
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return chacha_crypt_generic(state, dst, src, bytes, nrounds);
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do {
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unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
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scoped_ksimd()
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chacha_doneon(state, dst, src, todo, nrounds);
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bytes -= todo;
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src += todo;
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dst += todo;
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} while (bytes);
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}
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#define chacha_mod_init_arch chacha_mod_init_arch
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static void chacha_mod_init_arch(void)
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{
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if (cpu_have_named_feature(ASIMD))
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static_branch_enable(&have_neon);
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}
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