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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <asm/fpu/api.h>
#include <asm/cpufeature.h>
#include <asm/processor.h>
#include <asm/intel-family.h>
#ifdef CONFIG_AS_SSSE3
asmlinkage void hchacha20_ssse3(u8 *derived_key, const u8 *nonce,
const u8 *key);
asmlinkage void chacha20_ssse3(u8 *out, const u8 *in, const size_t len,
const u32 key[8], const u32 counter[4]);
#endif
#ifdef CONFIG_AS_AVX2
asmlinkage void chacha20_avx2(u8 *out, const u8 *in, const size_t len,
const u32 key[8], const u32 counter[4]);
#endif
#ifdef CONFIG_AS_AVX512
asmlinkage void chacha20_avx512(u8 *out, const u8 *in, const size_t len,
const u32 key[8], const u32 counter[4]);
asmlinkage void chacha20_avx512vl(u8 *out, const u8 *in, const size_t len,
const u32 key[8], const u32 counter[4]);
#endif
static bool chacha20_use_ssse3 __ro_after_init;
static bool chacha20_use_avx2 __ro_after_init;
static bool chacha20_use_avx512 __ro_after_init;
static bool chacha20_use_avx512vl __ro_after_init;
static void __init chacha20_fpu_init(void)
{
chacha20_use_ssse3 = boot_cpu_has(X86_FEATURE_SSSE3);
chacha20_use_avx2 =
boot_cpu_has(X86_FEATURE_AVX) &&
boot_cpu_has(X86_FEATURE_AVX2) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
#ifndef COMPAT_CANNOT_USE_AVX512
chacha20_use_avx512 =
boot_cpu_has(X86_FEATURE_AVX) &&
boot_cpu_has(X86_FEATURE_AVX2) &&
boot_cpu_has(X86_FEATURE_AVX512F) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
XFEATURE_MASK_AVX512, NULL) &&
/* Skylake downclocks unacceptably much when using zmm. */
boot_cpu_data.x86_model != INTEL_FAM6_SKYLAKE_X;
chacha20_use_avx512vl =
boot_cpu_has(X86_FEATURE_AVX) &&
boot_cpu_has(X86_FEATURE_AVX2) &&
boot_cpu_has(X86_FEATURE_AVX512F) &&
boot_cpu_has(X86_FEATURE_AVX512VL) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
XFEATURE_MASK_AVX512, NULL);
#endif
}
static inline bool chacha20_arch(struct chacha20_ctx *state, u8 *dst,
const u8 *src, const size_t len,
simd_context_t *simd_context)
{
if (!chacha20_use_ssse3 || len <= CHACHA20_BLOCK_SIZE ||
!simd_use(simd_context))
return false;
#ifdef CONFIG_AS_AVX512
if (chacha20_use_avx512 && len >= CHACHA20_BLOCK_SIZE * 8) {
chacha20_avx512(dst, src, len, state->key, state->counter);
goto success;
}
if (chacha20_use_avx512vl && len >= CHACHA20_BLOCK_SIZE * 4) {
chacha20_avx512vl(dst, src, len, state->key, state->counter);
goto success;
}
#endif
#ifdef CONFIG_AS_AVX2
if (chacha20_use_avx2 && len >= CHACHA20_BLOCK_SIZE * 4) {
chacha20_avx2(dst, src, len, state->key, state->counter);
goto success;
}
#endif
#ifdef CONFIG_AS_SSSE3
if (chacha20_use_ssse3) {
chacha20_ssse3(dst, src, len, state->key, state->counter);
goto success;
}
#endif
return false;
success:
state->counter[0] += (len + 63) / 64;
return true;
}
static inline bool hchacha20_arch(u8 *derived_key, const u8 *nonce,
const u8 *key, simd_context_t *simd_context)
{
#if defined(CONFIG_AS_SSSE3)
if (chacha20_use_ssse3 && simd_use(simd_context)) {
hchacha20_ssse3(derived_key, nonce, key);
return true;
}
#endif
return false;
}
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