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");
79