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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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648c7fb16f
Make the architecture-optimized CRC code do its CPU feature checks in subsys_initcalls instead of arch_initcalls. This makes it consistent with arch/*/lib/crypto/ and ensures that it runs after initcalls that possibly could be a prerequisite for kernel-mode FPU, such as x86's xfd_update_static_branch() and loongarch's init_euen_mask(). Note: as far as I can tell, x86's xfd_update_static_branch() isn't *actually* needed for kernel-mode FPU. loongarch's init_euen_mask() is needed to enable save/restore of the vector registers, but loongarch doesn't yet have any CRC or crypto code that uses vector registers anyway. Regardless, let's be consistent with arch/*/lib/crypto/ and robust against any potential future dependency on an arch_initcall. Link: https://lore.kernel.org/r/20250510035959.87995-1-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions
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*
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* Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
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*/
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#include <linux/crc-t10dif.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.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_neon);
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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 u16 crc_t10dif_pmull64(u16 init_crc, const u8 *buf, size_t len);
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asmlinkage void crc_t10dif_pmull8(u16 init_crc, const u8 *buf, size_t len,
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u8 out[16]);
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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_pmull64(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_neon) &&
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crypto_simd_usable()) {
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u8 buf[16] __aligned(16);
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kernel_neon_begin();
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crc_t10dif_pmull8(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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EXPORT_SYMBOL(crc_t10dif_arch);
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static int __init crc_t10dif_arm_init(void)
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{
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if (elf_hwcap & HWCAP_NEON) {
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static_branch_enable(&have_neon);
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if (elf_hwcap2 & HWCAP2_PMULL)
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static_branch_enable(&have_pmull);
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}
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return 0;
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}
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subsys_initcall(crc_t10dif_arm_init);
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static void __exit crc_t10dif_arm_exit(void)
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{
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}
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module_exit(crc_t10dif_arm_exit);
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_DESCRIPTION("Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions");
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MODULE_LICENSE("GPL v2");
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