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