cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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blake2s-glue.c (2232B)

      1// SPDX-License-Identifier: GPL-2.0 OR MIT
      2/*
      3 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
      4 */
      5
      6#include <crypto/internal/blake2s.h>
      7#include <crypto/internal/simd.h>
      8
      9#include <linux/types.h>
     10#include <linux/jump_label.h>
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/sizes.h>
     14
     15#include <asm/cpufeature.h>
     16#include <asm/fpu/api.h>
     17#include <asm/processor.h>
     18#include <asm/simd.h>
     19
     20asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state,
     21				       const u8 *block, const size_t nblocks,
     22				       const u32 inc);
     23asmlinkage void blake2s_compress_avx512(struct blake2s_state *state,
     24					const u8 *block, const size_t nblocks,
     25					const u32 inc);
     26
     27static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3);
     28static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512);
     29
     30void blake2s_compress(struct blake2s_state *state, const u8 *block,
     31		      size_t nblocks, const u32 inc)
     32{
     33	/* SIMD disables preemption, so relax after processing each page. */
     34	BUILD_BUG_ON(SZ_4K / BLAKE2S_BLOCK_SIZE < 8);
     35
     36	if (!static_branch_likely(&blake2s_use_ssse3) || !crypto_simd_usable()) {
     37		blake2s_compress_generic(state, block, nblocks, inc);
     38		return;
     39	}
     40
     41	do {
     42		const size_t blocks = min_t(size_t, nblocks,
     43					    SZ_4K / BLAKE2S_BLOCK_SIZE);
     44
     45		kernel_fpu_begin();
     46		if (IS_ENABLED(CONFIG_AS_AVX512) &&
     47		    static_branch_likely(&blake2s_use_avx512))
     48			blake2s_compress_avx512(state, block, blocks, inc);
     49		else
     50			blake2s_compress_ssse3(state, block, blocks, inc);
     51		kernel_fpu_end();
     52
     53		nblocks -= blocks;
     54		block += blocks * BLAKE2S_BLOCK_SIZE;
     55	} while (nblocks);
     56}
     57EXPORT_SYMBOL(blake2s_compress);
     58
     59static int __init blake2s_mod_init(void)
     60{
     61	if (boot_cpu_has(X86_FEATURE_SSSE3))
     62		static_branch_enable(&blake2s_use_ssse3);
     63
     64	if (IS_ENABLED(CONFIG_AS_AVX512) &&
     65	    boot_cpu_has(X86_FEATURE_AVX) &&
     66	    boot_cpu_has(X86_FEATURE_AVX2) &&
     67	    boot_cpu_has(X86_FEATURE_AVX512F) &&
     68	    boot_cpu_has(X86_FEATURE_AVX512VL) &&
     69	    cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
     70			      XFEATURE_MASK_AVX512, NULL))
     71		static_branch_enable(&blake2s_use_avx512);
     72
     73	return 0;
     74}
     75
     76module_init(blake2s_mod_init);
     77
     78MODULE_LICENSE("GPL v2");