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