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/crypto.h>
  27 #include <asm/cputable.h>
  28 #include <crypto/internal/hash.h>
  29
  30 extern struct shash_alg p8_ghash_alg;
  31 extern struct crypto_alg p8_aes_alg;
  32 extern struct crypto_alg p8_aes_cbc_alg;
  33 extern struct crypto_alg p8_aes_ctr_alg;
  34 static struct crypto_alg *algs[] = {
  35         &p8_aes_alg,
  36         &p8_aes_cbc_alg,
  37         &p8_aes_ctr_alg,
  38         NULL,
  39 };
  40
  41 int __init p8_init(void)
  42 {
  43         int ret = 0;
  44         struct crypto_alg **alg_it;
  45
  46         if (!(cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))
  47                 return -ENODEV;
  48
  49         for (alg_it = algs; *alg_it; alg_it++) {
  50                 ret = crypto_register_alg(*alg_it);
  51                 printk(KERN_INFO "crypto_register_alg '%s' = %d\n",
  52                        (*alg_it)->cra_name, ret);
  53                 if (ret) {
  54                         for (alg_it--; alg_it >= algs; alg_it--)
  55                                 crypto_unregister_alg(*alg_it);
  56                         break;
  57                 }
  58         }
  59         if (ret)
  60                 return ret;
  61
  62         ret = crypto_register_shash(&p8_ghash_alg);
  63         if (ret) {
  64                 for (alg_it = algs; *alg_it; alg_it++)
  65                         crypto_unregister_alg(*alg_it);
  66         }
  67         return ret;
  68 }
  69
  70 void __exit p8_exit(void)
  71 {
  72         struct crypto_alg **alg_it;
  73
  74         for (alg_it = algs; *alg_it; alg_it++) {
  75                 printk(KERN_INFO "Removing '%s'\n", (*alg_it)->cra_name);
  76                 crypto_unregister_alg(*alg_it);
  77         }
  78         crypto_unregister_shash(&p8_ghash_alg);
  79 }
  80
  81 module_init(p8_init);
  82 module_exit(p8_exit);
  83
  84 MODULE_AUTHOR("Marcelo Cerri<mhcerri@br.ibm.com>");
  85 MODULE_DESCRIPTION("IBM VMX cryptographic acceleration instructions "
  86                    "support on Power 8");
  87 MODULE_LICENSE("GPL");
  88 MODULE_VERSION("1.0.0");