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/CEX5/CEX6 Cryptographic Card device driver, " \
  41                    "Copyright IBM Corp. 2018");
  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/CEX5/CEX6 card device. It always
  70  * accepts the AP device since the bus_match already checked
  71  * the hardware type.
  72  * @ap_dev: pointer to the AP device.
  73  */
  74 static int zcrypt_cex4_card_probe(struct ap_device *ap_dev)
  75 {
  76         /*
  77          * Normalized speed ratings per crypto adapter
  78          * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
  79          */
  80         static const int CEX4A_SPEED_IDX[] = {
  81                  14, 19, 249, 42, 228, 1458, 0, 0};
  82         static const int CEX5A_SPEED_IDX[] = {
  83                   8,  9,  20, 18,  66,  458, 0, 0};
  84         static const int CEX6A_SPEED_IDX[] = {
  85                   6,  9,  20, 17,  65,  438, 0, 0};
  86
  87         static const int CEX4C_SPEED_IDX[] = {
  88                  59,  69, 308, 83, 278, 2204, 209, 40};
  89         static const int CEX5C_SPEED_IDX[] = {
  90                  24,  31,  50, 37,  90,  479,  27, 10};
  91         static const int CEX6C_SPEED_IDX[] = {
  92                  16,  20,  32, 27,  77,  455,  23,  9};
  93
  94         static const int CEX4P_SPEED_IDX[] = {
  95                 224, 313, 3560, 359, 605, 2827, 0, 50};
  96         static const int CEX5P_SPEED_IDX[] = {
  97                  63,  84,  156,  83, 142,  533, 0, 10};
  98         static const int CEX6P_SPEED_IDX[] = {
  99                  55,  70,  121,  73, 129,  522, 0,  9};
 100
 101         struct ap_card *ac = to_ap_card(&ap_dev->device);
 102         struct zcrypt_card *zc;
 103         int rc = 0;
 104
 105         zc = zcrypt_card_alloc();
 106         if (!zc)
 107                 return -ENOMEM;
 108         zc->card = ac;
 109         ac->private = zc;
 110         if (ap_test_bit(&ac->functions, AP_FUNC_ACCEL)) {
 111                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 112                         zc->type_string = "CEX4A";
 113                         zc->user_space_type = ZCRYPT_CEX4;
 114                         memcpy(zc->speed_rating, CEX4A_SPEED_IDX,
 115                                sizeof(CEX4A_SPEED_IDX));
 116                 } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
 117                         zc->type_string = "CEX5A";
 118                         zc->user_space_type = ZCRYPT_CEX5;
 119                         memcpy(zc->speed_rating, CEX5A_SPEED_IDX,
 120                                sizeof(CEX5A_SPEED_IDX));
 121                 } else {
 122                         zc->type_string = "CEX6A";
 123                         zc->user_space_type = ZCRYPT_CEX6;
 124                         memcpy(zc->speed_rating, CEX6A_SPEED_IDX,
 125                                sizeof(CEX6A_SPEED_IDX));
 126                 }
 127                 zc->min_mod_size = CEX4A_MIN_MOD_SIZE;
 128                 if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) &&
 129                     ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) {
 130                         zc->max_mod_size = CEX4A_MAX_MOD_SIZE_4K;
 131                         zc->max_exp_bit_length =
 132                                 CEX4A_MAX_MOD_SIZE_4K;
 133                 } else {
 134                         zc->max_mod_size = CEX4A_MAX_MOD_SIZE_2K;
 135                         zc->max_exp_bit_length =
 136                                 CEX4A_MAX_MOD_SIZE_2K;
 137                 }
 138         } else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO)) {
 139                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 140                         zc->type_string = "CEX4C";
 141                         /* wrong user space type, must be CEX4
 142                          * just keep it for cca compatibility
 143                          */
 144                         zc->user_space_type = ZCRYPT_CEX3C;
 145                         memcpy(zc->speed_rating, CEX4C_SPEED_IDX,
 146                                sizeof(CEX4C_SPEED_IDX));
 147                 } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
 148                         zc->type_string = "CEX5C";
 149                         /* wrong user space type, must be CEX5
 150                          * just keep it for cca compatibility
 151                          */
 152                         zc->user_space_type = ZCRYPT_CEX3C;
 153                         memcpy(zc->speed_rating, CEX5C_SPEED_IDX,
 154                                sizeof(CEX5C_SPEED_IDX));
 155                 } else {
 156                         zc->type_string = "CEX6C";
 157                         /* wrong user space type, must be CEX6
 158                          * just keep it for cca compatibility
 159                          */
 160                         zc->user_space_type = ZCRYPT_CEX3C;
 161                         memcpy(zc->speed_rating, CEX6C_SPEED_IDX,
 162                                sizeof(CEX6C_SPEED_IDX));
 163                 }
 164                 zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
 165                 zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
 166                 zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 167         } else if (ap_test_bit(&ac->functions, AP_FUNC_EP11)) {
 168                 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
 169                         zc->type_string = "CEX4P";
 170                         zc->user_space_type = ZCRYPT_CEX4;
 171                         memcpy(zc->speed_rating, CEX4P_SPEED_IDX,
 172                                sizeof(CEX4P_SPEED_IDX));
 173                 } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
 174                         zc->type_string = "CEX5P";
 175                         zc->user_space_type = ZCRYPT_CEX5;
 176                         memcpy(zc->speed_rating, CEX5P_SPEED_IDX,
 177                                sizeof(CEX5P_SPEED_IDX));
 178                 } else {
 179                         zc->type_string = "CEX6P";
 180                         zc->user_space_type = ZCRYPT_CEX6;
 181                         memcpy(zc->speed_rating, CEX6P_SPEED_IDX,
 182                                sizeof(CEX6P_SPEED_IDX));
 183                 }
 184                 zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
 185                 zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
 186                 zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
 187         } else {
 188                 zcrypt_card_free(zc);
 189                 return -ENODEV;
 190         }
 191         zc->online = 1;
 192
 193         rc = zcrypt_card_register(zc);
 194         if (rc) {
 195                 ac->private = NULL;
 196                 zcrypt_card_free(zc);
 197         }
 198
 199         return rc;
 200 }
 201
 202 /**
 203  * This is called to remove the CEX4/CEX5/CEX6 card driver information
 204  * if an AP card device is removed.
 205  */
 206 static void zcrypt_cex4_card_remove(struct ap_device *ap_dev)
 207 {
 208         struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
 209
 210         if (zc)
 211                 zcrypt_card_unregister(zc);
 212 }
 213
 214 static struct ap_driver zcrypt_cex4_card_driver = {
 215         .probe = zcrypt_cex4_card_probe,
 216         .remove = zcrypt_cex4_card_remove,
 217         .ids = zcrypt_cex4_card_ids,
 218         .flags = AP_DRIVER_FLAG_DEFAULT,
 219 };
 220
 221 /**
 222  * Probe function for CEX4/CEX5/CEX6 queue device. It always
 223  * accepts the AP device since the bus_match already checked
 224  * the hardware type.
 225  * @ap_dev: pointer to the AP device.
 226  */
 227 static int zcrypt_cex4_queue_probe(struct ap_device *ap_dev)
 228 {
 229         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 230         struct zcrypt_queue *zq;
 231         int rc;
 232
 233         if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL)) {
 234                 zq = zcrypt_queue_alloc(CEX4A_MAX_MESSAGE_SIZE);
 235                 if (!zq)
 236                         return -ENOMEM;
 237                 zq->ops = zcrypt_msgtype(MSGTYPE50_NAME,
 238                                          MSGTYPE50_VARIANT_DEFAULT);
 239         } else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) {
 240                 zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
 241                 if (!zq)
 242                         return -ENOMEM;
 243                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 244                                          MSGTYPE06_VARIANT_DEFAULT);
 245         } else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11)) {
 246                 zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
 247                 if (!zq)
 248                         return -ENOMEM;
 249                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 250                                          MSGTYPE06_VARIANT_EP11);
 251         } else {
 252                 return -ENODEV;
 253         }
 254         zq->queue = aq;
 255         zq->online = 1;
 256         atomic_set(&zq->load, 0);
 257         ap_queue_init_reply(aq, &zq->reply);
 258         aq->request_timeout = CEX4_CLEANUP_TIME,
 259         aq->private = zq;
 260         rc = zcrypt_queue_register(zq);
 261         if (rc) {
 262                 aq->private = NULL;
 263                 zcrypt_queue_free(zq);
 264         }
 265
 266         return rc;
 267 }
 268
 269 /**
 270  * This is called to remove the CEX4/CEX5/CEX6 queue driver
 271  * information if an AP queue device is removed.
 272  */
 273 static void zcrypt_cex4_queue_remove(struct ap_device *ap_dev)
 274 {
 275         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 276         struct zcrypt_queue *zq = aq->private;
 277
 278         ap_queue_remove(aq);
 279         if (zq)
 280                 zcrypt_queue_unregister(zq);
 281 }
 282
 283 static struct ap_driver zcrypt_cex4_queue_driver = {
 284         .probe = zcrypt_cex4_queue_probe,
 285         .remove = zcrypt_cex4_queue_remove,
 286         .suspend = ap_queue_suspend,
 287         .resume = ap_queue_resume,
 288         .ids = zcrypt_cex4_queue_ids,
 289         .flags = AP_DRIVER_FLAG_DEFAULT,
 290 };
 291
 292 int __init zcrypt_cex4_init(void)
 293 {
 294         int rc;
 295
 296         rc = ap_driver_register(&zcrypt_cex4_card_driver,
 297                                 THIS_MODULE, "cex4card");
 298         if (rc)
 299                 return rc;
 300
 301         rc = ap_driver_register(&zcrypt_cex4_queue_driver,
 302                                 THIS_MODULE, "cex4queue");
 303         if (rc)
 304                 ap_driver_unregister(&zcrypt_cex4_card_driver);
 305
 306         return rc;
 307 }
 308
 309 void __exit zcrypt_cex4_exit(void)
 310 {
 311         ap_driver_unregister(&zcrypt_cex4_queue_driver);
 312         ap_driver_unregister(&zcrypt_cex4_card_driver);
 313 }
 314
 315 module_init(zcrypt_cex4_init);
 316 module_exit(zcrypt_cex4_exit);