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
8#include <linux/types.h>
9#include <linux/jump_label.h>
10#include <linux/kernel.h>
11#include <linux/sizes.h>
12
13#include <asm/cpufeature.h>
14#include <asm/fpu/api.h>
15#include <asm/processor.h>
16#include <asm/simd.h>
17
18asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state,
19				       const u8 *block, const size_t nblocks,
20				       const u32 inc);
21asmlinkage void blake2s_compress_avx512(struct blake2s_state *state,
22					const u8 *block, const size_t nblocks,
23					const u32 inc);
24
25static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3);
26static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512);
27
28void blake2s_compress(struct blake2s_state *state, const u8 *block,
29		      size_t nblocks, const u32 inc)
30{
31	/* SIMD disables preemption, so relax after processing each page. */
32	BUILD_BUG_ON(SZ_4K / BLAKE2S_BLOCK_SIZE < 8);
33
34	if (!static_branch_likely(&blake2s_use_ssse3) || !may_use_simd()) {
35		blake2s_compress_generic(state, block, nblocks, inc);
36		return;
37	}
38
39	do {
40		const size_t blocks = min_t(size_t, nblocks,
41					    SZ_4K / BLAKE2S_BLOCK_SIZE);
42
43		kernel_fpu_begin();
44		if (IS_ENABLED(CONFIG_AS_AVX512) &&
45		    static_branch_likely(&blake2s_use_avx512))
46			blake2s_compress_avx512(state, block, blocks, inc);
47		else
48			blake2s_compress_ssse3(state, block, blocks, inc);
49		kernel_fpu_end();
50
51		nblocks -= blocks;
52		block += blocks * BLAKE2S_BLOCK_SIZE;
53	} while (nblocks);
54}
55EXPORT_SYMBOL(blake2s_compress);
56
57static int __init blake2s_mod_init(void)
58{
59	if (boot_cpu_has(X86_FEATURE_SSSE3))
60		static_branch_enable(&blake2s_use_ssse3);
61
62	if (IS_ENABLED(CONFIG_AS_AVX512) &&
63	    boot_cpu_has(X86_FEATURE_AVX) &&
64	    boot_cpu_has(X86_FEATURE_AVX2) &&
65	    boot_cpu_has(X86_FEATURE_AVX512F) &&
66	    boot_cpu_has(X86_FEATURE_AVX512VL) &&
67	    cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
68			      XFEATURE_MASK_AVX512, NULL))
69		static_branch_enable(&blake2s_use_avx512);
70
71	return 0;
72}
73
74subsys_initcall(blake2s_mod_init);
75