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 <asm/cpufeature.h>
7 #include <asm/fpu/api.h>
8 #include <asm/processor.h>
9 #include <asm/simd.h>
10 #include <crypto/internal/blake2s.h>
11 #include <linux/init.h>
12 #include <linux/jump_label.h>
13 #include <linux/kernel.h>
14 #include <linux/sizes.h>
15
16 asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state,
17 const u8 *block, const size_t nblocks,
18 const u32 inc);
19 asmlinkage void blake2s_compress_avx512(struct blake2s_state *state,
20 const u8 *block, const size_t nblocks,
21 const u32 inc);
22
23 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3);
24 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512);
25
blake2s_compress(struct blake2s_state * state,const u8 * block,size_t nblocks,const u32 inc)26 void blake2s_compress(struct blake2s_state *state, const u8 *block,
27 size_t nblocks, const u32 inc)
28 {
29 /* SIMD disables preemption, so relax after processing each page. */
30 BUILD_BUG_ON(SZ_4K / BLAKE2S_BLOCK_SIZE < 8);
31
32 if (!static_branch_likely(&blake2s_use_ssse3) || !may_use_simd()) {
33 blake2s_compress_generic(state, block, nblocks, inc);
34 return;
35 }
36
37 do {
38 const size_t blocks = min_t(size_t, nblocks,
39 SZ_4K / BLAKE2S_BLOCK_SIZE);
40
41 kernel_fpu_begin();
42 if (static_branch_likely(&blake2s_use_avx512))
43 blake2s_compress_avx512(state, block, blocks, inc);
44 else
45 blake2s_compress_ssse3(state, block, blocks, inc);
46 kernel_fpu_end();
47
48 nblocks -= blocks;
49 block += blocks * BLAKE2S_BLOCK_SIZE;
50 } while (nblocks);
51 }
52 EXPORT_SYMBOL(blake2s_compress);
53
blake2s_mod_init(void)54 static int __init blake2s_mod_init(void)
55 {
56 if (boot_cpu_has(X86_FEATURE_SSSE3))
57 static_branch_enable(&blake2s_use_ssse3);
58
59 if (boot_cpu_has(X86_FEATURE_AVX) &&
60 boot_cpu_has(X86_FEATURE_AVX2) &&
61 boot_cpu_has(X86_FEATURE_AVX512F) &&
62 boot_cpu_has(X86_FEATURE_AVX512VL) &&
63 cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
64 XFEATURE_MASK_AVX512, NULL))
65 static_branch_enable(&blake2s_use_avx512);
66
67 return 0;
68 }
69
70 subsys_initcall(blake2s_mod_init);
71