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 #include <linux/mod_devicetable.h>
  13
  14 #include "ap_bus.h"
  15 #include "zcrypt_api.h"
  16 #include "zcrypt_msgtype6.h"
  17 #include "zcrypt_msgtype50.h"
  18 #include "zcrypt_error.h"
  19 #include "zcrypt_cex4.h"
  20
  21 #define CEX4A_MIN_MOD_SIZE        1     /*    8 bits    */
  22 #define CEX4A_MAX_MOD_SIZE_2K   256     /* 2048 bits    */
  23 #define CEX4A_MAX_MOD_SIZE_4K   512     /* 4096 bits    */
  24
  25 #define CEX4C_MIN_MOD_SIZE       16     /*  256 bits    */
  26 #define CEX4C_MAX_MOD_SIZE      512     /* 4096 bits    */
  27
  28 #define CEX4A_MAX_MESSAGE_SIZE  MSGTYPE50_CRB3_MAX_MSG_SIZE
  29 #define CEX4C_MAX_MESSAGE_SIZE  MSGTYPE06_MAX_MSG_SIZE
  30
  31 /* Waiting time for requests to be processed.
  32  * Currently there are some types of request which are not deterministic.
  33  * But the maximum time limit managed by the stomper code is set to 60sec.
  34  * Hence we have to wait at least that time period.
  35  */
  36 #define CEX4_CLEANUP_TIME       (900*HZ)
  37
  38 MODULE_AUTHOR("IBM Corporation");
  39 MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
  40                    "Copyright IBM Corp. 2012");
  41 MODULE_LICENSE("GPL");
  42
  43 static struct ap_device_id zcrypt_cex4_card_ids[] = {
  44         { .dev_type = AP_DEVICE_TYPE_CEX4,
  45           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  46         { .dev_type = AP_DEVICE_TYPE_CEX5,
  47           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  48         { /* end of list */ },
  49 };
  50
  51 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_card_ids);
  52
  53 static struct ap_device_id zcrypt_cex4_queue_ids[] = {
  54         { .dev_type = AP_DEVICE_TYPE_CEX4,
  55           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  56         { .dev_type = AP_DEVICE_TYPE_CEX5,
  57           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  58         { /* end of list */ },
  59 };
  60
  61 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_queue_ids);
  62
  63 /**
  64  * Probe function for CEX4 card device. It always accepts the AP device
  65  * since the bus_match already checked the hardware type.
  66  * @ap_dev: pointer to the AP device.
  67  */
  68 static int zcrypt_cex4_card_probe(struct ap_device *ap_dev)
  69 {
  70         /*
  71          * Normalized speed ratings per crypto adapter
  72          * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
  73          */
  74         static const int CEX4A_SPEED_IDX[] = {
  75                 5,  6,    59,  20, 115,  581,  0,  0};
  76         static const int CEX5A_SPEED_IDX[] = {
  77                 3,  3,     6,   8,  32,  218,  0,  0};
  78         static const int CEX4C_SPEED_IDX[] = {
  79                 24,  25,   82,  41, 138, 1111, 79,  8};
  80         static const int CEX5C_SPEED_IDX[] = {
  81                 10,  14,   23,  17,  45,  242, 63,  4};
  82         static const int CEX4P_SPEED_IDX[] = {
  83                 142, 198, 1852, 203, 331, 1563,  0,  8};
  84         static const int CEX5P_SPEED_IDX[] = {
  85                 49,  67,  131,  52,  85,  287,  0,  4};
  86
  87         struct ap_card *ac = to_ap_card(&ap_dev->device);
  88         struct zcrypt_card *zc;
  89         int rc = 0;
  90
  91         zc = zcrypt_card_alloc();
  92         if (!zc)
  93                 return -ENOMEM;
  94         zc->card = ac;
  95         ac->private = zc;
  96         if (ap_test_bit(&ac->functions, AP_FUNC_ACCEL)) {
  97                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
  98                         zc->type_string = "CEX4A";
  99                         zc->user_space_type = ZCRYPT_CEX4;
 100                         memcpy(zc->speed_rating, CEX4A_SPEED_IDX,
 101                                sizeof(CEX4A_SPEED_IDX));
 102                 } else {
 103                         zc->type_string = "CEX5A";
 104                         zc->user_space_type = ZCRYPT_CEX5;
 105                         memcpy(zc->speed_rating, CEX5A_SPEED_IDX,
 106                                sizeof(CEX5A_SPEED_IDX));
 107                 }
 108                 zc->min_mod_size = CEX4A_MIN_MOD_SIZE;
 109                 if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) &&
 110                     ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) {
 111                         zc->max_mod_size = CEX4A_MAX_MOD_SIZE_4K;
 112                         zc->max_exp_bit_length =
 113                                 CEX4A_MAX_MOD_SIZE_4K;
 114                 } else {
 115                         zc->max_mod_size = CEX4A_MAX_MOD_SIZE_2K;
 116                         zc->max_exp_bit_length =
 117                                 CEX4A_MAX_MOD_SIZE_2K;
 118                 }
 119         } else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO)) {
 120                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 121                         zc->type_string = "CEX4C";
 122                         /* wrong user space type, must be CEX4
 123                          * just keep it for cca compatibility
 124                          */
 125                         zc->user_space_type = ZCRYPT_CEX3C;
 126                         memcpy(zc->speed_rating, CEX4C_SPEED_IDX,
 127                                sizeof(CEX4C_SPEED_IDX));
 128                 } else {
 129                         zc->type_string = "CEX5C";
 130                         /* wrong user space type, must be CEX5
 131                          * just keep it for cca compatibility
 132                          */
 133                         zc->user_space_type = ZCRYPT_CEX3C;
 134                         memcpy(zc->speed_rating, CEX5C_SPEED_IDX,
 135                                sizeof(CEX5C_SPEED_IDX));
 136                 }
 137                 zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
 138                 zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
 139                 zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 140         } else if (ap_test_bit(&ac->functions, AP_FUNC_EP11)) {
 141                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 142                         zc->type_string = "CEX4P";
 143                         zc->user_space_type = ZCRYPT_CEX4;
 144                         memcpy(zc->speed_rating, CEX4P_SPEED_IDX,
 145                                sizeof(CEX4P_SPEED_IDX));
 146                 } else {
 147                         zc->type_string = "CEX5P";
 148                         zc->user_space_type = ZCRYPT_CEX5;
 149                         memcpy(zc->speed_rating, CEX5P_SPEED_IDX,
 150                                sizeof(CEX5P_SPEED_IDX));
 151                 }
 152                 zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
 153                 zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
 154                 zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 155         } else {
 156                 zcrypt_card_free(zc);
 157                 return -ENODEV;
 158         }
 159         zc->online = 1;
 160
 161         rc = zcrypt_card_register(zc);
 162         if (rc) {
 163                 ac->private = NULL;
 164                 zcrypt_card_free(zc);
 165         }
 166
 167         return rc;
 168 }
 169
 170 /**
 171  * This is called to remove the CEX4 card driver information
 172  * if an AP card device is removed.
 173  */
 174 static void zcrypt_cex4_card_remove(struct ap_device *ap_dev)
 175 {
 176         struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
 177
 178         if (zc)
 179                 zcrypt_card_unregister(zc);
 180 }
 181
 182 static struct ap_driver zcrypt_cex4_card_driver = {
 183         .probe = zcrypt_cex4_card_probe,
 184         .remove = zcrypt_cex4_card_remove,
 185         .ids = zcrypt_cex4_card_ids,
 186 };
 187
 188 /**
 189  * Probe function for CEX4 queue device. It always accepts the AP device
 190  * since the bus_match already checked the hardware type.
 191  * @ap_dev: pointer to the AP device.
 192  */
 193 static int zcrypt_cex4_queue_probe(struct ap_device *ap_dev)
 194 {
 195         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 196         struct zcrypt_queue *zq;
 197         int rc;
 198
 199         if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL)) {
 200                 zq = zcrypt_queue_alloc(CEX4A_MAX_MESSAGE_SIZE);
 201                 if (!zq)
 202                         return -ENOMEM;
 203                 zq->ops = zcrypt_msgtype(MSGTYPE50_NAME,
 204                                          MSGTYPE50_VARIANT_DEFAULT);
 205         } else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) {
 206                 zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
 207                 if (!zq)
 208                         return -ENOMEM;
 209                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 210                                          MSGTYPE06_VARIANT_DEFAULT);
 211         } else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11)) {
 212                 zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
 213                 if (!zq)
 214                         return -ENOMEM;
 215                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 216                                          MSGTYPE06_VARIANT_EP11);
 217         } else {
 218                 return -ENODEV;
 219         }
 220         zq->queue = aq;
 221         zq->online = 1;
 222         atomic_set(&zq->load, 0);
 223         ap_queue_init_reply(aq, &zq->reply);
 224         aq->request_timeout = CEX4_CLEANUP_TIME,
 225         aq->private = zq;
 226         rc = zcrypt_queue_register(zq);
 227         if (rc) {
 228                 aq->private = NULL;
 229                 zcrypt_queue_free(zq);
 230         }
 231
 232         return rc;
 233 }
 234
 235 /**
 236  * This is called to remove the CEX4 queue driver information
 237  * if an AP queue device is removed.
 238  */
 239 static void zcrypt_cex4_queue_remove(struct ap_device *ap_dev)
 240 {
 241         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 242         struct zcrypt_queue *zq = aq->private;
 243
 244         ap_queue_remove(aq);
 245         if (zq)
 246                 zcrypt_queue_unregister(zq);
 247 }
 248
 249 static struct ap_driver zcrypt_cex4_queue_driver = {
 250         .probe = zcrypt_cex4_queue_probe,
 251         .remove = zcrypt_cex4_queue_remove,
 252         .suspend = ap_queue_suspend,
 253         .resume = ap_queue_resume,
 254         .ids = zcrypt_cex4_queue_ids,
 255 };
 256
 257 int __init zcrypt_cex4_init(void)
 258 {
 259         int rc;
 260
 261         rc = ap_driver_register(&zcrypt_cex4_card_driver,
 262                                 THIS_MODULE, "cex4card");
 263         if (rc)
 264                 return rc;
 265
 266         rc = ap_driver_register(&zcrypt_cex4_queue_driver,
 267                                 THIS_MODULE, "cex4queue");
 268         if (rc)
 269                 ap_driver_unregister(&zcrypt_cex4_card_driver);
 270
 271         return rc;
 272 }
 273
 274 void __exit zcrypt_cex4_exit(void)
 275 {
 276         ap_driver_unregister(&zcrypt_cex4_queue_driver);
 277         ap_driver_unregister(&zcrypt_cex4_card_driver);
 278 }
 279
 280 module_init(zcrypt_cex4_init);
 281 module_exit(zcrypt_cex4_exit);