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