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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2019 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>
asmlinkage void hchacha20_ssse3(u32 *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]);
asmlinkage void chacha20_avx2(u8 *out, const u8 *in, const size_t len,
const u32 key[8], const u32 counter[4]);
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]);
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 bool *const chacha20_nobs[] __initconst = {
&chacha20_use_ssse3, &chacha20_use_avx2, &chacha20_use_avx512,
&chacha20_use_avx512vl };
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 *ctx, u8 *dst,
const u8 *src, size_t len,
simd_context_t *simd_context)
{
/* SIMD disables preemption, so relax after processing each page. */
BUILD_BUG_ON(PAGE_SIZE < CHACHA20_BLOCK_SIZE ||
PAGE_SIZE % CHACHA20_BLOCK_SIZE);
if (!IS_ENABLED(CONFIG_AS_SSSE3) || !chacha20_use_ssse3 ||
len <= CHACHA20_BLOCK_SIZE || !simd_use(simd_context))
return false;
for (;;) {
const size_t bytes = min_t(size_t, len, PAGE_SIZE);
if (IS_ENABLED(CONFIG_AS_AVX512) && chacha20_use_avx512 &&
len >= CHACHA20_BLOCK_SIZE * 8)
chacha20_avx512(dst, src, bytes, ctx->key, ctx->counter);
else if (IS_ENABLED(CONFIG_AS_AVX512) && chacha20_use_avx512vl &&
len >= CHACHA20_BLOCK_SIZE * 4)
chacha20_avx512vl(dst, src, bytes, ctx->key, ctx->counter);
else if (IS_ENABLED(CONFIG_AS_AVX2) && chacha20_use_avx2 &&
len >= CHACHA20_BLOCK_SIZE * 4)
chacha20_avx2(dst, src, bytes, ctx->key, ctx->counter);
else
chacha20_ssse3(dst, src, bytes, ctx->key, ctx->counter);
ctx->counter[0] += (bytes + 63) / 64;
len -= bytes;
if (!len)
break;
dst += bytes;
src += bytes;
simd_relax(simd_context);
}
return true;
}
static inline bool hchacha20_arch(u32 derived_key[CHACHA20_KEY_WORDS],
const u8 nonce[HCHACHA20_NONCE_SIZE],
const u8 key[HCHACHA20_KEY_SIZE],
simd_context_t *simd_context)
{
if (IS_ENABLED(CONFIG_AS_SSSE3) && chacha20_use_ssse3 &&
simd_use(simd_context)) {
hchacha20_ssse3(derived_key, nonce, key);
return true;
}
return false;
}
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