xref: /openbmc/linux/arch/x86/crypto/blake2s-glue.c (revision b71e2a69)
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 
blake2s_compress(struct blake2s_state * state,const u8 * block,size_t nblocks,const u32 inc)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 
blake2s_mod_init(void)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