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13cecc526d
Consolidate the ChaCha code into a single module (excluding chacha-block-generic.c which remains always built-in for random.c), similar to various other algorithms: - Each arch now provides a header file lib/crypto/$(SRCARCH)/chacha.h, replacing lib/crypto/$(SRCARCH)/chacha*.c. The header defines chacha_crypt_arch() and hchacha_block_arch(). It is included by lib/crypto/chacha.c, and thus the code gets built into the single libchacha module, with improved inlining in some cases. - Whether arch-optimized ChaCha is buildable is now controlled centrally by lib/crypto/Kconfig instead of by lib/crypto/$(SRCARCH)/Kconfig. The conditions for enabling it remain the same as before, and it remains enabled by default. - Any additional arch-specific translation units for the optimized ChaCha code, such as assembly files, are now compiled by lib/crypto/Makefile instead of lib/crypto/$(SRCARCH)/Makefile. This removes the last use for the Makefile and Kconfig files in the arm64, mips, powerpc, riscv, and s390 subdirectories of lib/crypto/. So also remove those files and the references to them. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250827151131.27733-7-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* ChaCha stream cipher (P10 accelerated)
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*
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* Copyright 2023- IBM Corp. All rights reserved.
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*/
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#include <crypto/internal/simd.h>
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#include <linux/kernel.h>
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#include <linux/cpufeature.h>
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#include <linux/sizes.h>
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#include <asm/simd.h>
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#include <asm/switch_to.h>
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asmlinkage void chacha_p10le_8x(const struct chacha_state *state, u8 *dst,
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const u8 *src, unsigned int len, int nrounds);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_p10);
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static void vsx_begin(void)
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{
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preempt_disable();
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enable_kernel_vsx();
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}
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static void vsx_end(void)
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{
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disable_kernel_vsx();
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preempt_enable();
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}
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static void chacha_p10_do_8x(struct chacha_state *state, u8 *dst, const u8 *src,
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unsigned int bytes, int nrounds)
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{
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unsigned int l = bytes & ~0x0FF;
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if (l > 0) {
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chacha_p10le_8x(state, dst, src, l, nrounds);
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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] += l / CHACHA_BLOCK_SIZE;
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}
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if (bytes > 0)
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chacha_crypt_generic(state, dst, src, bytes, nrounds);
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}
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#define hchacha_block_arch hchacha_block_generic /* not implemented yet */
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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_p10) || 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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vsx_begin();
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chacha_p10_do_8x(state, dst, src, todo, nrounds);
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vsx_end();
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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_has_feature(CPU_FTR_ARCH_31))
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static_branch_enable(&have_p10);
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}
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