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
18 asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state,
19 const u8 *block, const size_t nblocks,
20 const u32 inc);
21 asmlinkage void blake2s_compress_avx512(struct blake2s_state *state,
22 const u8 *block, const size_t nblocks,
23 const u32 inc);
24
25 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3);
26 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512);
27
28 void 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 }
55 EXPORT_SYMBOL(blake2s_compress);
56
57 static 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
74 subsys_initcall(blake2s_mod_init);
75
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.