kernel/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 #define CEX4P_SPEED_RATING      7000     /* TODO new card, new speed rating */
  30 #define CEX5A_SPEED_RATING      450      /* TODO new card, new speed rating */
  31 #define CEX5C_SPEED_RATING      3250     /* TODO new card, new speed rating */
  32 #define CEX5P_SPEED_RATING      3500     /* TODO new card, new speed rating */
  33
  34 #define CEX4A_MAX_MESSAGE_SIZE  MSGTYPE50_CRB3_MAX_MSG_SIZE
  35 #define CEX4C_MAX_MESSAGE_SIZE  MSGTYPE06_MAX_MSG_SIZE
  36
  37 /* Waiting time for requests to be processed.
  38  * Currently there are some types of request which are not deterministic.
  39  * But the maximum time limit managed by the stomper code is set to 60sec.
  40  * Hence we have to wait at least that time period.
  41  */
  42 #define CEX4_CLEANUP_TIME       (61*HZ)
  43
  44 static struct ap_device_id zcrypt_cex4_ids[] = {
  45         { AP_DEVICE(AP_DEVICE_TYPE_CEX4)  },
  46         { AP_DEVICE(AP_DEVICE_TYPE_CEX5)  },
  47         { /* end of list */ },
  48 };
  49
  50 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
  51 MODULE_AUTHOR("IBM Corporation");
  52 MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
  53                    "Copyright IBM Corp. 2012");
  54 MODULE_LICENSE("GPL");
  55
  56 static int zcrypt_cex4_probe(struct ap_device *ap_dev);
  57 static void zcrypt_cex4_remove(struct ap_device *ap_dev);
  58
  59 static struct ap_driver zcrypt_cex4_driver = {
  60         .probe = zcrypt_cex4_probe,
  61         .remove = zcrypt_cex4_remove,
  62         .ids = zcrypt_cex4_ids,
  63         .request_timeout = CEX4_CLEANUP_TIME,
  64 };
  65
  66 /**
  67  * Probe function for CEX4 cards. It always accepts the AP device
  68  * since the bus_match already checked the hardware type.
  69  * @ap_dev: pointer to the AP device.
  70  */
  71 static int zcrypt_cex4_probe(struct ap_device *ap_dev)
  72 {
  73         struct zcrypt_device *zdev = NULL;
  74         int rc = 0;
  75
  76         switch (ap_dev->device_type) {
  77         case AP_DEVICE_TYPE_CEX4:
  78         case AP_DEVICE_TYPE_CEX5:
  79                 if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
  80                         zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
  81                         if (!zdev)
  82                                 return -ENOMEM;
  83                         if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
  84                                 zdev->type_string = "CEX4A";
  85                                 zdev->speed_rating = CEX4A_SPEED_RATING;
  86                         } else {
  87                                 zdev->type_string = "CEX5A";
  88                                 zdev->speed_rating = CEX5A_SPEED_RATING;
  89                         }
  90                         zdev->user_space_type = ZCRYPT_CEX3A;
  91                         zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
  92                         if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
  93                             ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
  94                                 zdev->max_mod_size =
  95                                         CEX4A_MAX_MOD_SIZE_4K;
  96                                 zdev->max_exp_bit_length =
  97                                         CEX4A_MAX_MOD_SIZE_4K;
  98                         } else {
  99                                 zdev->max_mod_size =
 100                                         CEX4A_MAX_MOD_SIZE_2K;
 101                                 zdev->max_exp_bit_length =
 102                                         CEX4A_MAX_MOD_SIZE_2K;
 103                         }
 104                         zdev->short_crt = 1;
 105                         zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
 106                                                            MSGTYPE50_VARIANT_DEFAULT);
 107                 } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
 108                         zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
 109                         if (!zdev)
 110                                 return -ENOMEM;
 111                         if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
 112                                 zdev->type_string = "CEX4C";
 113                                 zdev->speed_rating = CEX4C_SPEED_RATING;
 114                         } else {
 115                                 zdev->type_string = "CEX5C";
 116                                 zdev->speed_rating = CEX5C_SPEED_RATING;
 117                         }
 118                         zdev->user_space_type = ZCRYPT_CEX3C;
 119                         zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
 120                         zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
 121                         zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 122                         zdev->short_crt = 0;
 123                         zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
 124                                                            MSGTYPE06_VARIANT_DEFAULT);
 125                 } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_EP11)) {
 126                         zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
 127                         if (!zdev)
 128                                 return -ENOMEM;
 129                         if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
 130                                 zdev->type_string = "CEX4P";
 131                                 zdev->speed_rating = CEX4P_SPEED_RATING;
 132                         } else {
 133                                 zdev->type_string = "CEX5P";
 134                                 zdev->speed_rating = CEX5P_SPEED_RATING;
 135                         }
 136                         zdev->user_space_type = ZCRYPT_CEX4;
 137                         zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
 138                         zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
 139                         zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 140                         zdev->short_crt = 0;
 141                         zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
 142                                                         MSGTYPE06_VARIANT_EP11);
 143                 }
 144                 break;
 145         }
 146         if (!zdev)
 147                 return -ENODEV;
 148         zdev->ap_dev = ap_dev;
 149         zdev->online = 1;
 150         ap_dev->reply = &zdev->reply;
 151         ap_dev->private = zdev;
 152         rc = zcrypt_device_register(zdev);
 153         if (rc) {
 154                 zcrypt_msgtype_release(zdev->ops);
 155                 ap_dev->private = NULL;
 156                 zcrypt_device_free(zdev);
 157         }
 158         return rc;
 159 }
 160
 161 /**
 162  * This is called to remove the extended CEX4 driver information
 163  * if an AP device is removed.
 164  */
 165 static void zcrypt_cex4_remove(struct ap_device *ap_dev)
 166 {
 167         struct zcrypt_device *zdev = ap_dev->private;
 168         struct zcrypt_ops *zops;
 169
 170         if (zdev) {
 171                 zops = zdev->ops;
 172                 zcrypt_device_unregister(zdev);
 173                 zcrypt_msgtype_release(zops);
 174         }
 175 }
 176
 177 int __init zcrypt_cex4_init(void)
 178 {
 179         return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
 180 }
 181
 182 void __exit zcrypt_cex4_exit(void)
 183 {
 184         ap_driver_unregister(&zcrypt_cex4_driver);
 185 }
 186
 187 module_init(zcrypt_cex4_init);
 188 module_exit(zcrypt_cex4_exit);