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/* SPDX-License-Identifier: GPL-2.0 */
/*
* x86_64 accelerated implementation of NH
*
* Copyright 2018 Google LLC
*/
#include <asm/fpu/api.h>
#include <linux/static_call.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sse2);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_avx2);
asmlinkage void nh_sse2(const u32 *key, const u8 *message, size_t message_len,
__le64 hash[NH_NUM_PASSES]);
asmlinkage void nh_avx2(const u32 *key, const u8 *message, size_t message_len,
__le64 hash[NH_NUM_PASSES]);
static bool nh_arch(const u32 *key, const u8 *message, size_t message_len,
__le64 hash[NH_NUM_PASSES])
{
if (message_len >= 64 && static_branch_likely(&have_sse2) &&
irq_fpu_usable()) {
kernel_fpu_begin();
if (static_branch_likely(&have_avx2))
nh_avx2(key, message, message_len, hash);
else
nh_sse2(key, message, message_len, hash);
kernel_fpu_end();
return true;
}
return false;
}
#define nh_mod_init_arch nh_mod_init_arch
static void nh_mod_init_arch(void)
{
if (boot_cpu_has(X86_FEATURE_XMM2)) {
static_branch_enable(&have_sse2);
if (boot_cpu_has(X86_FEATURE_AVX2) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
NULL))
static_branch_enable(&have_avx2);
}
}
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