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7439cfed1c
Move the powerpc CRC-T10DIF assembly code into the lib directory and wire it up to the library interface. This allows it to be used without going through the crypto API. It remains usable via the crypto API too via the shash algorithms that use the library interface. Thus all the arch-specific "shash" code becomes unnecessary and is removed. Note: to see the diff from arch/powerpc/crypto/crct10dif-vpmsum_glue.c to arch/powerpc/lib/crc-t10dif-glue.c, view this commit with 'git show -M10'. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20241202012056.209768-8-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Calculate a CRC T10-DIF with vpmsum acceleration
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*
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* Copyright 2017, Daniel Axtens, IBM Corporation.
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* [based on crc32c-vpmsum_glue.c]
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*/
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#include <linux/crc-t10dif.h>
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#include <crypto/internal/simd.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/cpufeature.h>
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#include <asm/simd.h>
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#include <asm/switch_to.h>
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#define VMX_ALIGN 16
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#define VMX_ALIGN_MASK (VMX_ALIGN-1)
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#define VECTOR_BREAKPOINT 64
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static DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
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u32 __crct10dif_vpmsum(u32 crc, unsigned char const *p, size_t len);
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u16 crc_t10dif_arch(u16 crci, const u8 *p, size_t len)
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{
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unsigned int prealign;
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unsigned int tail;
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u32 crc = crci;
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if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) ||
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!static_branch_likely(&have_vec_crypto) || !crypto_simd_usable())
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return crc_t10dif_generic(crc, p, len);
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if ((unsigned long)p & VMX_ALIGN_MASK) {
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prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
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crc = crc_t10dif_generic(crc, p, prealign);
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len -= prealign;
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p += prealign;
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}
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if (len & ~VMX_ALIGN_MASK) {
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crc <<= 16;
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preempt_disable();
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pagefault_disable();
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enable_kernel_altivec();
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crc = __crct10dif_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);
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disable_kernel_altivec();
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pagefault_enable();
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preempt_enable();
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crc >>= 16;
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}
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tail = len & VMX_ALIGN_MASK;
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if (tail) {
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p += len & ~VMX_ALIGN_MASK;
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crc = crc_t10dif_generic(crc, p, tail);
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}
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return crc & 0xffff;
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}
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EXPORT_SYMBOL(crc_t10dif_arch);
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static int __init crc_t10dif_powerpc_init(void)
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{
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if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
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(cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))
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static_branch_enable(&have_vec_crypto);
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return 0;
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}
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arch_initcall(crc_t10dif_powerpc_init);
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static void __exit crc_t10dif_powerpc_exit(void)
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{
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}
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module_exit(crc_t10dif_powerpc_exit);
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bool crc_t10dif_is_optimized(void)
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{
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return static_key_enabled(&have_vec_crypto);
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}
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EXPORT_SYMBOL(crc_t10dif_is_optimized);
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MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
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MODULE_DESCRIPTION("CRCT10DIF using vector polynomial multiply-sum instructions");
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MODULE_LICENSE("GPL");
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