1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions 4 * 5 * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <asm/simd.h> 9 10 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); 11 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull); 12 13 #define CRC_T10DIF_PMULL_CHUNK_SIZE 16U 14 15 asmlinkage u16 crc_t10dif_pmull64(u16 init_crc, const u8 *buf, size_t len); 16 asmlinkage void crc_t10dif_pmull8(u16 init_crc, const u8 *buf, size_t len, 17 u8 out[16]); 18 19 static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length) 20 { 21 if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && likely(may_use_simd())) { 22 if (static_branch_likely(&have_pmull)) { 23 scoped_ksimd() 24 return crc_t10dif_pmull64(crc, data, length); 25 } else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE && 26 static_branch_likely(&have_neon)) { 27 u8 buf[16] __aligned(16); 28 29 scoped_ksimd() 30 crc_t10dif_pmull8(crc, data, length, buf); 31 32 return crc_t10dif_generic(0, buf, sizeof(buf)); 33 } 34 } 35 return crc_t10dif_generic(crc, data, length); 36 } 37 38 #define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch 39 static void crc_t10dif_mod_init_arch(void) 40 { 41 if (elf_hwcap & HWCAP_NEON) { 42 static_branch_enable(&have_neon); 43 if (elf_hwcap2 & HWCAP2_PMULL) 44 static_branch_enable(&have_pmull); 45 } 46 } 47