drivers/crypto/vmx/vmx.c

   1 /**
   2  * Routines supporting VMX instructions on the Power 8
   3  *
   4  * Copyright (C) 2015 International Business Machines Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 only.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/types.h>
  25 #include <linux/err.h>
  26 #include <linux/cpufeature.h>
  27 #include <linux/crypto.h>
  28 #include <asm/cputable.h>
  29 #include <crypto/internal/hash.h>
  30
  31 extern struct shash_alg p8_ghash_alg;
  32 extern struct crypto_alg p8_aes_alg;
  33 extern struct crypto_alg p8_aes_cbc_alg;
  34 extern struct crypto_alg p8_aes_ctr_alg;
  35 static struct crypto_alg *algs[] = {
  36         &p8_aes_alg,
  37         &p8_aes_cbc_alg,
  38         &p8_aes_ctr_alg,
  39         NULL,
  40 };
  41
  42 int __init p8_init(void)
  43 {
  44         int ret = 0;
  45         struct crypto_alg **alg_it;
  46
  47         for (alg_it = algs; *alg_it; alg_it++) {
  48                 ret = crypto_register_alg(*alg_it);
  49                 printk(KERN_INFO "crypto_register_alg '%s' = %d\n",
  50                        (*alg_it)->cra_name, ret);
  51                 if (ret) {
  52                         for (alg_it--; alg_it >= algs; alg_it--)
  53                                 crypto_unregister_alg(*alg_it);
  54                         break;
  55                 }
  56         }
  57         if (ret)
  58                 return ret;
  59
  60         ret = crypto_register_shash(&p8_ghash_alg);
  61         if (ret) {
  62                 for (alg_it = algs; *alg_it; alg_it++)
  63                         crypto_unregister_alg(*alg_it);
  64         }
  65         return ret;
  66 }
  67
  68 void __exit p8_exit(void)
  69 {
  70         struct crypto_alg **alg_it;
  71
  72         for (alg_it = algs; *alg_it; alg_it++) {
  73                 printk(KERN_INFO "Removing '%s'\n", (*alg_it)->cra_name);
  74                 crypto_unregister_alg(*alg_it);
  75         }
  76         crypto_unregister_shash(&p8_ghash_alg);
  77 }
  78
  79 module_cpu_feature_match(PPC_MODULE_FEATURE_VEC_CRYPTO, p8_init);
  80 module_exit(p8_exit);
  81
  82 MODULE_AUTHOR("Marcelo Cerri<mhcerri@br.ibm.com>");
  83 MODULE_DESCRIPTION("IBM VMX cryptographic acceleration instructions "
  84                    "support on Power 8");
  85 MODULE_LICENSE("GPL");
  86 MODULE_VERSION("1.0.0");