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// SPDX-License-Identifier: GPL-2.0-only
/*
* Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions
*
* Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
*/
#include <linux/cpufeature.h>
#include <linux/crc-t10dif.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <crypto/internal/simd.h>
#include <asm/neon.h>
#include <asm/simd.h>
static DEFINE_STATIC_KEY_FALSE(have_asimd);
static DEFINE_STATIC_KEY_FALSE(have_pmull);
#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
asmlinkage void crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len,
u8 out[16]);
asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len);
u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
{
if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE) {
if (static_branch_likely(&have_pmull)) {
if (crypto_simd_usable()) {
kernel_neon_begin();
crc = crc_t10dif_pmull_p64(crc, data, length);
kernel_neon_end();
return crc;
}
} else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE &&
static_branch_likely(&have_asimd) &&
crypto_simd_usable()) {
u8 buf[16];
kernel_neon_begin();
crc_t10dif_pmull_p8(crc, data, length, buf);
kernel_neon_end();
crc = 0;
data = buf;
length = sizeof(buf);
}
}
return crc_t10dif_generic(crc, data, length);
}
EXPORT_SYMBOL(crc_t10dif_arch);
static int __init crc_t10dif_arm64_init(void)
{
if (cpu_have_named_feature(ASIMD)) {
static_branch_enable(&have_asimd);
if (cpu_have_named_feature(PMULL))
static_branch_enable(&have_pmull);
}
return 0;
}
arch_initcall(crc_t10dif_arm64_init);
static void __exit crc_t10dif_arm64_exit(void)
{
}
module_exit(crc_t10dif_arm64_exit);
bool crc_t10dif_is_optimized(void)
{
return static_key_enabled(&have_asimd);
}
EXPORT_SYMBOL(crc_t10dif_is_optimized);
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_DESCRIPTION("CRC-T10DIF using arm64 NEON and Crypto Extensions");
MODULE_LICENSE("GPL v2");
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