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126 lines
2.9 KiB
126 lines
2.9 KiB
// 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/hash.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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u32 __crct10dif_vpmsum(u32 crc, unsigned char const *p, size_t len); |
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static u16 crct10dif_vpmsum(u16 crci, unsigned char const *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) || !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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static int crct10dif_vpmsum_init(struct shash_desc *desc) |
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{ |
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u16 *crc = shash_desc_ctx(desc); |
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*crc = 0; |
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return 0; |
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} |
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static int crct10dif_vpmsum_update(struct shash_desc *desc, const u8 *data, |
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unsigned int length) |
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{ |
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u16 *crc = shash_desc_ctx(desc); |
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*crc = crct10dif_vpmsum(*crc, data, length); |
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return 0; |
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} |
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static int crct10dif_vpmsum_final(struct shash_desc *desc, u8 *out) |
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{ |
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u16 *crcp = shash_desc_ctx(desc); |
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*(u16 *)out = *crcp; |
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return 0; |
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} |
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static struct shash_alg alg = { |
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.init = crct10dif_vpmsum_init, |
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.update = crct10dif_vpmsum_update, |
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.final = crct10dif_vpmsum_final, |
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.descsize = CRC_T10DIF_DIGEST_SIZE, |
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.digestsize = CRC_T10DIF_DIGEST_SIZE, |
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.base = { |
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.cra_name = "crct10dif", |
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.cra_driver_name = "crct10dif-vpmsum", |
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.cra_priority = 200, |
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.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static int __init crct10dif_vpmsum_mod_init(void) |
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{ |
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if (!cpu_has_feature(CPU_FTR_ARCH_207S)) |
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return -ENODEV; |
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return crypto_register_shash(&alg); |
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} |
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static void __exit crct10dif_vpmsum_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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module_cpu_feature_match(PPC_MODULE_FEATURE_VEC_CRYPTO, crct10dif_vpmsum_mod_init); |
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module_exit(crct10dif_vpmsum_mod_fini); |
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MODULE_AUTHOR("Daniel Axtens <[email protected]>"); |
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MODULE_DESCRIPTION("CRCT10DIF using vector polynomial multiply-sum instructions"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_CRYPTO("crct10dif"); |
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MODULE_ALIAS_CRYPTO("crct10dif-vpmsum");
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