drivers/s390/crypto/zcrypt_cex4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright IBM Corp. 2012
   4  *  Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/slab.h>
   9 #include <linux/init.h>
  10 #include <linux/err.h>
  11 #include <linux/atomic.h>
  12 #include <linux/uaccess.h>
  13 #include <linux/mod_devicetable.h>
  14
  15 #include "ap_bus.h"
  16 #include "zcrypt_api.h"
  17 #include "zcrypt_msgtype6.h"
  18 #include "zcrypt_msgtype50.h"
  19 #include "zcrypt_error.h"
  20 #include "zcrypt_cex4.h"
  21
  22 #define CEX4A_MIN_MOD_SIZE        1     /*    8 bits    */
  23 #define CEX4A_MAX_MOD_SIZE_2K   256     /* 2048 bits    */
  24 #define CEX4A_MAX_MOD_SIZE_4K   512     /* 4096 bits    */
  25
  26 #define CEX4C_MIN_MOD_SIZE       16     /*  256 bits    */
  27 #define CEX4C_MAX_MOD_SIZE      512     /* 4096 bits    */
  28
  29 #define CEX4A_MAX_MESSAGE_SIZE  MSGTYPE50_CRB3_MAX_MSG_SIZE
  30 #define CEX4C_MAX_MESSAGE_SIZE  MSGTYPE06_MAX_MSG_SIZE
  31
  32 /* Waiting time for requests to be processed.
  33  * Currently there are some types of request which are not deterministic.
  34  * But the maximum time limit managed by the stomper code is set to 60sec.
  35  * Hence we have to wait at least that time period.
  36  */
  37 #define CEX4_CLEANUP_TIME       (900*HZ)
  38
  39 MODULE_AUTHOR("IBM Corporation");
  40 MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
  41                    "Copyright IBM Corp. 2012");
  42 MODULE_LICENSE("GPL");
  43
  44 static struct ap_device_id zcrypt_cex4_card_ids[] = {
  45         { .dev_type = AP_DEVICE_TYPE_CEX4,
  46           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  47         { .dev_type = AP_DEVICE_TYPE_CEX5,
  48           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  49         { .dev_type = AP_DEVICE_TYPE_CEX6,
  50           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  51         { /* end of list */ },
  52 };
  53
  54 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_card_ids);
  55
  56 static struct ap_device_id zcrypt_cex4_queue_ids[] = {
  57         { .dev_type = AP_DEVICE_TYPE_CEX4,
  58           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  59         { .dev_type = AP_DEVICE_TYPE_CEX5,
  60           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  61         { .dev_type = AP_DEVICE_TYPE_CEX6,
  62           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  63         { /* end of list */ },
  64 };
  65
  66 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_queue_ids);
  67
  68 /**
  69  * Probe function for CEX4 card device. It always accepts the AP device
  70  * since the bus_match already checked the hardware type.
  71  * @ap_dev: pointer to the AP device.
  72  */
  73 static int zcrypt_cex4_card_probe(struct ap_device *ap_dev)
  74 {
  75         /*
  76          * Normalized speed ratings per crypto adapter
  77          * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
  78          */
  79         static const int CEX4A_SPEED_IDX[] = {
  80                  14, 19, 249, 42, 228, 1458, 0, 0};
  81         static const int CEX5A_SPEED_IDX[] = {
  82                   8,  9,  20, 18,  66,  458, 0, 0};
  83         static const int CEX6A_SPEED_IDX[] = {
  84                   6,  9,  20, 17,  65,  438, 0, 0};
  85
  86         static const int CEX4C_SPEED_IDX[] = {
  87                  59,  69, 308, 83, 278, 2204, 209, 40};
  88         static const int CEX5C_SPEED_IDX[] = {
  89                  24,  31,  50, 37,  90,  479,  27, 10};
  90         static const int CEX6C_SPEED_IDX[] = {
  91                  16,  20,  32, 27,  77,  455,  23,  9};
  92
  93         static const int CEX4P_SPEED_IDX[] = {
  94                 224, 313, 3560, 359, 605, 2827, 0, 50};
  95         static const int CEX5P_SPEED_IDX[] = {
  96                  63,  84,  156,  83, 142,  533, 0, 10};
  97         static const int CEX6P_SPEED_IDX[] = {
  98                  55,  70,  121,  73, 129,  522, 0,  9};
  99
 100         struct ap_card *ac = to_ap_card(&ap_dev->device);
 101         struct zcrypt_card *zc;
 102         int rc = 0;
 103
 104         zc = zcrypt_card_alloc();
 105         if (!zc)
 106                 return -ENOMEM;
 107         zc->card = ac;
 108         ac->private = zc;
 109         if (ap_test_bit(&ac->functions, AP_FUNC_ACCEL)) {
 110                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 111                         zc->type_string = "CEX4A";
 112                         zc->user_space_type = ZCRYPT_CEX4;
 113                         memcpy(zc->speed_rating, CEX4A_SPEED_IDX,
 114                                sizeof(CEX4A_SPEED_IDX));
 115                 } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
 116                         zc->type_string = "CEX5A";
 117                         zc->user_space_type = ZCRYPT_CEX5;
 118                         memcpy(zc->speed_rating, CEX5A_SPEED_IDX,
 119                                sizeof(CEX5A_SPEED_IDX));
 120                 } else {
 121                         zc->type_string = "CEX6A";
 122                         zc->user_space_type = ZCRYPT_CEX6;
 123                         memcpy(zc->speed_rating, CEX6A_SPEED_IDX,
 124                                sizeof(CEX6A_SPEED_IDX));
 125                 }
 126                 zc->min_mod_size = CEX4A_MIN_MOD_SIZE;
 127                 if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) &&
 128                     ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) {
 129                         zc->max_mod_size = CEX4A_MAX_MOD_SIZE_4K;
 130                         zc->max_exp_bit_length =
 131                                 CEX4A_MAX_MOD_SIZE_4K;
 132                 } else {
 133                         zc->max_mod_size = CEX4A_MAX_MOD_SIZE_2K;
 134                         zc->max_exp_bit_length =
 135                                 CEX4A_MAX_MOD_SIZE_2K;
 136                 }
 137         } else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO)) {
 138                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 139                         zc->type_string = "CEX4C";
 140                         /* wrong user space type, must be CEX4
 141                          * just keep it for cca compatibility
 142                          */
 143                         zc->user_space_type = ZCRYPT_CEX3C;
 144                         memcpy(zc->speed_rating, CEX4C_SPEED_IDX,
 145                                sizeof(CEX4C_SPEED_IDX));
 146                 } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
 147                         zc->type_string = "CEX5C";
 148                         /* wrong user space type, must be CEX5
 149                          * just keep it for cca compatibility
 150                          */
 151                         zc->user_space_type = ZCRYPT_CEX3C;
 152                         memcpy(zc->speed_rating, CEX5C_SPEED_IDX,
 153                                sizeof(CEX5C_SPEED_IDX));
 154                 } else {
 155                         zc->type_string = "CEX6C";
 156                         /* wrong user space type, must be CEX6
 157                          * just keep it for cca compatibility
 158                          */
 159                         zc->user_space_type = ZCRYPT_CEX3C;
 160                         memcpy(zc->speed_rating, CEX6C_SPEED_IDX,
 161                                sizeof(CEX6C_SPEED_IDX));
 162                 }
 163                 zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
 164                 zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
 165                 zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 166         } else if (ap_test_bit(&ac->functions, AP_FUNC_EP11)) {
 167                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 168                         zc->type_string = "CEX4P";
 169                         zc->user_space_type = ZCRYPT_CEX4;
 170                         memcpy(zc->speed_rating, CEX4P_SPEED_IDX,
 171                                sizeof(CEX4P_SPEED_IDX));
 172                 } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
 173                         zc->type_string = "CEX5P";
 174                         zc->user_space_type = ZCRYPT_CEX5;
 175                         memcpy(zc->speed_rating, CEX5P_SPEED_IDX,
 176                                sizeof(CEX5P_SPEED_IDX));
 177                 } else {
 178                         zc->type_string = "CEX6P";
 179                         zc->user_space_type = ZCRYPT_CEX6;
 180                         memcpy(zc->speed_rating, CEX6P_SPEED_IDX,
 181                                sizeof(CEX6P_SPEED_IDX));
 182                 }
 183                 zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
 184                 zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
 185                 zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 186         } else {
 187                 zcrypt_card_free(zc);
 188                 return -ENODEV;
 189         }
 190         zc->online = 1;
 191
 192         rc = zcrypt_card_register(zc);
 193         if (rc) {
 194                 ac->private = NULL;
 195                 zcrypt_card_free(zc);
 196         }
 197
 198         return rc;
 199 }
 200
 201 /**
 202  * This is called to remove the CEX4 card driver information
 203  * if an AP card device is removed.
 204  */
 205 static void zcrypt_cex4_card_remove(struct ap_device *ap_dev)
 206 {
 207         struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
 208
 209         if (zc)
 210                 zcrypt_card_unregister(zc);
 211 }
 212
 213 static struct ap_driver zcrypt_cex4_card_driver = {
 214         .probe = zcrypt_cex4_card_probe,
 215         .remove = zcrypt_cex4_card_remove,
 216         .ids = zcrypt_cex4_card_ids,
 217 };
 218
 219 /**
 220  * Probe function for CEX4 queue device. It always accepts the AP device
 221  * since the bus_match already checked the hardware type.
 222  * @ap_dev: pointer to the AP device.
 223  */
 224 static int zcrypt_cex4_queue_probe(struct ap_device *ap_dev)
 225 {
 226         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 227         struct zcrypt_queue *zq;
 228         int rc;
 229
 230         if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL)) {
 231                 zq = zcrypt_queue_alloc(CEX4A_MAX_MESSAGE_SIZE);
 232                 if (!zq)
 233                         return -ENOMEM;
 234                 zq->ops = zcrypt_msgtype(MSGTYPE50_NAME,
 235                                          MSGTYPE50_VARIANT_DEFAULT);
 236         } else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) {
 237                 zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
 238                 if (!zq)
 239                         return -ENOMEM;
 240                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 241                                          MSGTYPE06_VARIANT_DEFAULT);
 242         } else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11)) {
 243                 zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
 244                 if (!zq)
 245                         return -ENOMEM;
 246                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 247                                          MSGTYPE06_VARIANT_EP11);
 248         } else {
 249                 return -ENODEV;
 250         }
 251         zq->queue = aq;
 252         zq->online = 1;
 253         atomic_set(&zq->load, 0);
 254         ap_queue_init_reply(aq, &zq->reply);
 255         aq->request_timeout = CEX4_CLEANUP_TIME,
 256         aq->private = zq;
 257         rc = zcrypt_queue_register(zq);
 258         if (rc) {
 259                 aq->private = NULL;
 260                 zcrypt_queue_free(zq);
 261         }
 262
 263         return rc;
 264 }
 265
 266 /**
 267  * This is called to remove the CEX4 queue driver information
 268  * if an AP queue device is removed.
 269  */
 270 static void zcrypt_cex4_queue_remove(struct ap_device *ap_dev)
 271 {
 272         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 273         struct zcrypt_queue *zq = aq->private;
 274
 275         ap_queue_remove(aq);
 276         if (zq)
 277                 zcrypt_queue_unregister(zq);
 278 }
 279
 280 static struct ap_driver zcrypt_cex4_queue_driver = {
 281         .probe = zcrypt_cex4_queue_probe,
 282         .remove = zcrypt_cex4_queue_remove,
 283         .suspend = ap_queue_suspend,
 284         .resume = ap_queue_resume,
 285         .ids = zcrypt_cex4_queue_ids,
 286 };
 287
 288 int __init zcrypt_cex4_init(void)
 289 {
 290         int rc;
 291
 292         rc = ap_driver_register(&zcrypt_cex4_card_driver,
 293                                 THIS_MODULE, "cex4card");
 294         if (rc)
 295                 return rc;
 296
 297         rc = ap_driver_register(&zcrypt_cex4_queue_driver,
 298                                 THIS_MODULE, "cex4queue");
 299         if (rc)
 300                 ap_driver_unregister(&zcrypt_cex4_card_driver);
 301
 302         return rc;
 303 }
 304
 305 void __exit zcrypt_cex4_exit(void)
 306 {
 307         ap_driver_unregister(&zcrypt_cex4_queue_driver);
 308         ap_driver_unregister(&zcrypt_cex4_card_driver);
 309 }
 310
 311 module_init(zcrypt_cex4_init);
 312 module_exit(zcrypt_cex4_exit);