drivers/s390/crypto/zcrypt_cex4.c

   1 /*
   2  *  Copyright IBM Corp. 2012
   3  *  Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/slab.h>
   8 #include <linux/init.h>
   9 #include <linux/err.h>
  10 #include <linux/atomic.h>
  11 #include <linux/uaccess.h>
  12
  13 #include "ap_bus.h"
  14 #include "zcrypt_api.h"
  15 #include "zcrypt_msgtype6.h"
  16 #include "zcrypt_msgtype50.h"
  17 #include "zcrypt_error.h"
  18 #include "zcrypt_cex4.h"
  19
  20 #define CEX4A_MIN_MOD_SIZE        1     /*    8 bits    */
  21 #define CEX4A_MAX_MOD_SIZE_2K   256     /* 2048 bits    */
  22 #define CEX4A_MAX_MOD_SIZE_4K   512     /* 4096 bits    */
  23
  24 #define CEX4C_MIN_MOD_SIZE       16     /*  256 bits    */
  25 #define CEX4C_MAX_MOD_SIZE      512     /* 4096 bits    */
  26
  27 #define CEX4A_SPEED_RATING      900      /* TODO new card, new speed rating */
  28 #define CEX4C_SPEED_RATING      6500     /* TODO new card, new speed rating */
  29
  30 #define CEX4A_MAX_MESSAGE_SIZE  MSGTYPE50_CRB3_MAX_MSG_SIZE
  31 #define CEX4C_MAX_MESSAGE_SIZE  MSGTYPE06_MAX_MSG_SIZE
  32
  33 #define CEX4_CLEANUP_TIME       (15*HZ)
  34
  35 static struct ap_device_id zcrypt_cex4_ids[] = {
  36         { AP_DEVICE(AP_DEVICE_TYPE_CEX4)  },
  37         { /* end of list */ },
  38 };
  39
  40 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
  41 MODULE_AUTHOR("IBM Corporation");
  42 MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
  43                    "Copyright IBM Corp. 2012");
  44 MODULE_LICENSE("GPL");
  45
  46 static int zcrypt_cex4_probe(struct ap_device *ap_dev);
  47 static void zcrypt_cex4_remove(struct ap_device *ap_dev);
  48
  49 static struct ap_driver zcrypt_cex4_driver = {
  50         .probe = zcrypt_cex4_probe,
  51         .remove = zcrypt_cex4_remove,
  52         .ids = zcrypt_cex4_ids,
  53         .request_timeout = CEX4_CLEANUP_TIME,
  54 };
  55
  56 /**
  57  * Probe function for CEX4 cards. It always accepts the AP device
  58  * since the bus_match already checked the hardware type.
  59  * @ap_dev: pointer to the AP device.
  60  */
  61 static int zcrypt_cex4_probe(struct ap_device *ap_dev)
  62 {
  63         struct zcrypt_device *zdev = NULL;
  64         int rc = 0;
  65
  66         switch (ap_dev->device_type) {
  67         case AP_DEVICE_TYPE_CEX4:
  68                 if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
  69                         zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
  70                         if (!zdev)
  71                                 return -ENOMEM;
  72                         zdev->type_string = "CEX4A";
  73                         zdev->user_space_type = ZCRYPT_CEX3A;
  74                         zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
  75                         if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
  76                             ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
  77                                 zdev->max_mod_size =
  78                                         CEX4A_MAX_MOD_SIZE_4K;
  79                                 zdev->max_exp_bit_length =
  80                                         CEX4A_MAX_MOD_SIZE_4K;
  81                         } else {
  82                                 zdev->max_mod_size =
  83                                         CEX4A_MAX_MOD_SIZE_2K;
  84                                 zdev->max_exp_bit_length =
  85                                         CEX4A_MAX_MOD_SIZE_2K;
  86                         }
  87                         zdev->short_crt = 1;
  88                         zdev->speed_rating = CEX4A_SPEED_RATING;
  89                         zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
  90                                                            MSGTYPE50_VARIANT_DEFAULT);
  91                 } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
  92                         zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
  93                         if (!zdev)
  94                                 return -ENOMEM;
  95                         zdev->type_string = "CEX4C";
  96                         zdev->user_space_type = ZCRYPT_CEX3C;
  97                         zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
  98                         zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
  99                         zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 100                         zdev->short_crt = 0;
 101                         zdev->speed_rating = CEX4C_SPEED_RATING;
 102                         zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
 103                                                            MSGTYPE06_VARIANT_DEFAULT);
 104                 }
 105                 break;
 106         }
 107         if (!zdev)
 108                 return -ENODEV;
 109         zdev->ap_dev = ap_dev;
 110         zdev->online = 1;
 111         ap_dev->reply = &zdev->reply;
 112         ap_dev->private = zdev;
 113         rc = zcrypt_device_register(zdev);
 114         if (rc) {
 115                 zcrypt_msgtype_release(zdev->ops);
 116                 ap_dev->private = NULL;
 117                 zcrypt_device_free(zdev);
 118         }
 119         return rc;
 120 }
 121
 122 /**
 123  * This is called to remove the extended CEX4 driver information
 124  * if an AP device is removed.
 125  */
 126 static void zcrypt_cex4_remove(struct ap_device *ap_dev)
 127 {
 128         struct zcrypt_device *zdev = ap_dev->private;
 129         struct zcrypt_ops *zops;
 130
 131         if (zdev) {
 132                 zops = zdev->ops;
 133                 zcrypt_device_unregister(zdev);
 134                 zcrypt_msgtype_release(zops);
 135         }
 136 }
 137
 138 int __init zcrypt_cex4_init(void)
 139 {
 140         return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
 141 }
 142
 143 void __exit zcrypt_cex4_exit(void)
 144 {
 145         ap_driver_unregister(&zcrypt_cex4_driver);
 146 }
 147
 148 module_init(zcrypt_cex4_init);
 149 module_exit(zcrypt_cex4_exit);