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190c253d86
Move the powerpc-optimized CRC code from arch/powerpc/lib/crc* into its new location in lib/crc/powerpc/, 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/20250607200454.73587-8-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
69 lines
1.7 KiB
C
69 lines
1.7 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 <asm/switch_to.h>
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#include <crypto/internal/simd.h>
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#include <linux/cpufeature.h>
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#include <linux/jump_label.h>
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#include <linux/preempt.h>
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#include <linux/uaccess.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 __ro_after_init 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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static inline 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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#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_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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}
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