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| 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 |
Warning: This file is not a C or C++ file. It does not have highlighting.