1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions 4 * 5 * Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <linux/cpufeature.h> 9 10 #include <asm/simd.h> 11 12 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_asimd); 13 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull); 14 15 #define CRC_T10DIF_PMULL_CHUNK_SIZE 16U 16 17 asmlinkage void crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len, 18 u8 out[16]); 19 asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len); 20 21 static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length) 22 { 23 if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && likely(may_use_simd())) { 24 if (static_branch_likely(&have_pmull)) { 25 scoped_ksimd() 26 return crc_t10dif_pmull_p64(crc, data, length); 27 } else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE && 28 static_branch_likely(&have_asimd)) { 29 u8 buf[16]; 30 31 scoped_ksimd() 32 crc_t10dif_pmull_p8(crc, data, length, buf); 33 34 return crc_t10dif_generic(0, buf, sizeof(buf)); 35 } 36 } 37 return crc_t10dif_generic(crc, data, length); 38 } 39 40 #define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch 41 static void crc_t10dif_mod_init_arch(void) 42 { 43 if (cpu_have_named_feature(ASIMD)) { 44 static_branch_enable(&have_asimd); 45 if (cpu_have_named_feature(PMULL)) 46 static_branch_enable(&have_pmull); 47 } 48 } 49