arch/x86/crypto/blake2s-glue.c

   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);