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/neon.h> 11 #include <asm/simd.h> 12 13 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_asimd); 14 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull); 15 16 #define CRC_T10DIF_PMULL_CHUNK_SIZE 16U 17 18 asmlinkage void crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len, 19 u8 out[16]); 20 asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len); 21 22 static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length) 23 { 24 if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE) { 25 if (static_branch_likely(&have_pmull)) { 26 if (likely(may_use_simd())) { 27 kernel_neon_begin(); 28 crc = crc_t10dif_pmull_p64(crc, data, length); 29 kernel_neon_end(); 30 return crc; 31 } 32 } else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE && 33 static_branch_likely(&have_asimd) && 34 likely(may_use_simd())) { 35 u8 buf[16]; 36 37 kernel_neon_begin(); 38 crc_t10dif_pmull_p8(crc, data, length, buf); 39 kernel_neon_end(); 40 41 return crc_t10dif_generic(0, buf, sizeof(buf)); 42 } 43 } 44 return crc_t10dif_generic(crc, data, length); 45 } 46 47 #define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch 48 static void crc_t10dif_mod_init_arch(void) 49 { 50 if (cpu_have_named_feature(ASIMD)) { 51 static_branch_enable(&have_asimd); 52 if (cpu_have_named_feature(PMULL)) 53 static_branch_enable(&have_pmull); 54 } 55 } 56