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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 <linux/simd.h>
#include <asm/cpufeature.h>
#include <asm/processor.h>
#include <asm/fpu/api.h>
asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state,
const u8 *block, const size_t nblocks,
const u32 inc);
asmlinkage void blake2s_compress_avx512(struct blake2s_state *state,
const u8 *block, const size_t nblocks,
const u32 inc);
static bool blake2s_use_ssse3 __ro_after_init;
static bool blake2s_use_avx512 __ro_after_init;
static bool *const blake2s_nobs[] __initconst = { &blake2s_use_avx512 };
static void __init blake2s_fpu_init(void)
{
blake2s_use_ssse3 =
boot_cpu_has(X86_FEATURE_SSSE3) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL);
#ifndef COMPAT_CANNOT_USE_AVX512
blake2s_use_avx512 =
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 blake2s_compress_arch(struct blake2s_state *state,
const u8 *block, size_t nblocks,
const u32 inc)
{
simd_context_t simd_context;
bool used_arch = false;
/* SIMD disables preemption, so relax after processing each page. */
BUILD_BUG_ON(PAGE_SIZE / BLAKE2S_BLOCK_SIZE < 8);
simd_get(&simd_context);
if (!IS_ENABLED(CONFIG_AS_SSSE3) || !blake2s_use_ssse3 ||
!simd_use(&simd_context))
goto out;
used_arch = true;
for (;;) {
const size_t blocks = min_t(size_t, nblocks,
PAGE_SIZE / BLAKE2S_BLOCK_SIZE);
if (IS_ENABLED(CONFIG_AS_AVX512) && blake2s_use_avx512)
blake2s_compress_avx512(state, block, blocks, inc);
else
blake2s_compress_ssse3(state, block, blocks, inc);
nblocks -= blocks;
if (!nblocks)
break;
block += blocks * BLAKE2S_BLOCK_SIZE;
simd_relax(&simd_context);
}
out:
simd_put(&simd_context);
return used_arch;
}
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