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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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2b7531b2a2
Move the arm64-optimized CRC code from arch/arm64/lib/crc* into its new location in lib/crc/arm64/, and wire it up in the new way. This new way of organizing the CRC code eliminates the need to artificially split the code for each CRC variant into separate arch and generic modules, enabling better inlining and dead code elimination. For more details, see "lib/crc: Prepare for arch-optimized code in subdirs of lib/crc/". Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com> Link: https://lore.kernel.org/r/20250607200454.73587-5-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions
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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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#include <linux/cpufeature.h>
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#include <crypto/internal/simd.h>
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#include <asm/neon.h>
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#include <asm/simd.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_asimd);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull);
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#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
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asmlinkage void crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len,
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u8 out[16]);
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asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len);
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static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
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{
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if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE) {
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if (static_branch_likely(&have_pmull)) {
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if (crypto_simd_usable()) {
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kernel_neon_begin();
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crc = crc_t10dif_pmull_p64(crc, data, length);
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kernel_neon_end();
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return crc;
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}
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} else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE &&
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static_branch_likely(&have_asimd) &&
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crypto_simd_usable()) {
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u8 buf[16];
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kernel_neon_begin();
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crc_t10dif_pmull_p8(crc, data, length, buf);
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kernel_neon_end();
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return crc_t10dif_generic(0, buf, sizeof(buf));
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}
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}
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return crc_t10dif_generic(crc, data, length);
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}
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#define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch
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static inline void crc_t10dif_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_asimd);
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if (cpu_have_named_feature(PMULL))
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static_branch_enable(&have_pmull);
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}
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}
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