arch/arm64/crypto/crct10dif-ce-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions
   4  *
   5  * Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <linux/cpufeature.h>
   9 #include <linux/crc-t10dif.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/string.h>
  14
  15 #include <crypto/internal/hash.h>
  16 #include <crypto/internal/simd.h>
  17
  18 #include <asm/neon.h>
  19 #include <asm/simd.h>
  20
  21 #define CRC_T10DIF_PMULL_CHUNK_SIZE     16U
  22
  23 asmlinkage u16 crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len);
  24 asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len);
  25
  26 static int crct10dif_init(struct shash_desc *desc)
  27 {
  28         u16 *crc = shash_desc_ctx(desc);
  29
  30         *crc = 0;
  31         return 0;
  32 }
  33
  34 static int crct10dif_update_pmull_p8(struct shash_desc *desc, const u8 *data,
  35                             unsigned int length)
  36 {
  37         u16 *crc = shash_desc_ctx(desc);
  38
  39         if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) {
  40                 kernel_neon_begin();
  41                 *crc = crc_t10dif_pmull_p8(*crc, data, length);
  42                 kernel_neon_end();
  43         } else {
  44                 *crc = crc_t10dif_generic(*crc, data, length);
  45         }
  46
  47         return 0;
  48 }
  49
  50 static int crct10dif_update_pmull_p64(struct shash_desc *desc, const u8 *data,
  51                             unsigned int length)
  52 {
  53         u16 *crc = shash_desc_ctx(desc);
  54
  55         if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) {
  56                 kernel_neon_begin();
  57                 *crc = crc_t10dif_pmull_p64(*crc, data, length);
  58                 kernel_neon_end();
  59         } else {
  60                 *crc = crc_t10dif_generic(*crc, data, length);
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int crct10dif_final(struct shash_desc *desc, u8 *out)
  67 {
  68         u16 *crc = shash_desc_ctx(desc);
  69
  70         *(u16 *)out = *crc;
  71         return 0;
  72 }
  73
  74 static struct shash_alg crc_t10dif_alg[] = {{
  75         .digestsize             = CRC_T10DIF_DIGEST_SIZE,
  76         .init                   = crct10dif_init,
  77         .update                 = crct10dif_update_pmull_p8,
  78         .final                  = crct10dif_final,
  79         .descsize               = CRC_T10DIF_DIGEST_SIZE,
  80
  81         .base.cra_name          = "crct10dif",
  82         .base.cra_driver_name   = "crct10dif-arm64-neon",
  83         .base.cra_priority      = 100,
  84         .base.cra_blocksize     = CRC_T10DIF_BLOCK_SIZE,
  85         .base.cra_module        = THIS_MODULE,
  86 }, {
  87         .digestsize             = CRC_T10DIF_DIGEST_SIZE,
  88         .init                   = crct10dif_init,
  89         .update                 = crct10dif_update_pmull_p64,
  90         .final                  = crct10dif_final,
  91         .descsize               = CRC_T10DIF_DIGEST_SIZE,
  92
  93         .base.cra_name          = "crct10dif",
  94         .base.cra_driver_name   = "crct10dif-arm64-ce",
  95         .base.cra_priority      = 200,
  96         .base.cra_blocksize     = CRC_T10DIF_BLOCK_SIZE,
  97         .base.cra_module        = THIS_MODULE,
  98 }};
  99
 100 static int __init crc_t10dif_mod_init(void)
 101 {
 102         if (cpu_have_named_feature(PMULL))
 103                 return crypto_register_shashes(crc_t10dif_alg,
 104                                                ARRAY_SIZE(crc_t10dif_alg));
 105         else
 106                 /* only register the first array element */
 107                 return crypto_register_shash(crc_t10dif_alg);
 108 }
 109
 110 static void __exit crc_t10dif_mod_exit(void)
 111 {
 112         if (cpu_have_named_feature(PMULL))
 113                 crypto_unregister_shashes(crc_t10dif_alg,
 114                                           ARRAY_SIZE(crc_t10dif_alg));
 115         else
 116                 crypto_unregister_shash(crc_t10dif_alg);
 117 }
 118
 119 module_cpu_feature_match(ASIMD, crc_t10dif_mod_init);
 120 module_exit(crc_t10dif_mod_exit);
 121
 122 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
 123 MODULE_LICENSE("GPL v2");
 124 MODULE_ALIAS_CRYPTO("crct10dif");
 125 MODULE_ALIAS_CRYPTO("crct10dif-arm64-ce");