mirror of https://github.com/torvalds/linux.git
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* CRC-T10DIF using PCLMULQDQ instructions
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*
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* Copyright 2024 Google LLC
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*/
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#include <asm/cpufeatures.h>
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#include <asm/simd.h>
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#include <crypto/internal/simd.h>
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#include <linux/crc-t10dif.h>
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#include <linux/module.h>
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static DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
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asmlinkage u16 crc_t10dif_pcl(u16 init_crc, const u8 *buf, size_t len);
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u16 crc_t10dif_arch(u16 crc, const u8 *p, size_t len)
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{
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if (len >= 16 &&
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static_key_enabled(&have_pclmulqdq) && crypto_simd_usable()) {
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kernel_fpu_begin();
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crc = crc_t10dif_pcl(crc, p, len);
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kernel_fpu_end();
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return crc;
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}
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return crc_t10dif_generic(crc, p, len);
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}
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EXPORT_SYMBOL(crc_t10dif_arch);
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static int __init crc_t10dif_x86_init(void)
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{
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if (boot_cpu_has(X86_FEATURE_PCLMULQDQ))
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static_branch_enable(&have_pclmulqdq);
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return 0;
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}
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arch_initcall(crc_t10dif_x86_init);
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static void __exit crc_t10dif_x86_exit(void)
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{
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}
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module_exit(crc_t10dif_x86_exit);
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bool crc_t10dif_is_optimized(void)
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{
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return static_key_enabled(&have_pclmulqdq);
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}
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EXPORT_SYMBOL(crc_t10dif_is_optimized);
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MODULE_DESCRIPTION("CRC-T10DIF using PCLMULQDQ instructions");
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MODULE_LICENSE("GPL");
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