drivers/s390/crypto/zcrypt_cex2c.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Copyright IBM Corp. 2001, 2018
   4  *  Author(s): Robert Burroughs
   5  *             Eric Rossman (edrossma@us.ibm.com)
   6  *
   7  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
   8  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
   9  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
  10  *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/err.h>
  16 #include <linux/delay.h>
  17 #include <linux/slab.h>
  18 #include <linux/atomic.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/mod_devicetable.h>
  21
  22 #include "ap_bus.h"
  23 #include "zcrypt_api.h"
  24 #include "zcrypt_error.h"
  25 #include "zcrypt_msgtype6.h"
  26 #include "zcrypt_cex2c.h"
  27 #include "zcrypt_cca_key.h"
  28 #include "zcrypt_ccamisc.h"
  29
  30 #define CEX2C_MIN_MOD_SIZE       16     /*  128 bits    */
  31 #define CEX2C_MAX_MOD_SIZE      256     /* 2048 bits    */
  32 #define CEX3C_MIN_MOD_SIZE       16     /*  128 bits    */
  33 #define CEX3C_MAX_MOD_SIZE      512     /* 4096 bits    */
  34 #define CEX2C_MAX_XCRB_MESSAGE_SIZE (12*1024)
  35 #define CEX2C_CLEANUP_TIME      (15*HZ)
  36
  37 MODULE_AUTHOR("IBM Corporation");
  38 MODULE_DESCRIPTION("CEX2C/CEX3C Cryptographic Coprocessor device driver, " \
  39                    "Copyright IBM Corp. 2001, 2018");
  40 MODULE_LICENSE("GPL");
  41
  42 static struct ap_device_id zcrypt_cex2c_card_ids[] = {
  43         { .dev_type = AP_DEVICE_TYPE_CEX2C,
  44           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  45         { .dev_type = AP_DEVICE_TYPE_CEX3C,
  46           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  47         { /* end of list */ },
  48 };
  49
  50 MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_card_ids);
  51
  52 static struct ap_device_id zcrypt_cex2c_queue_ids[] = {
  53         { .dev_type = AP_DEVICE_TYPE_CEX2C,
  54           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  55         { .dev_type = AP_DEVICE_TYPE_CEX3C,
  56           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  57         { /* end of list */ },
  58 };
  59
  60 MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_queue_ids);
  61
  62 /*
  63  * CCA card additional device attributes
  64  */
  65 static ssize_t cca_serialnr_show(struct device *dev,
  66                                  struct device_attribute *attr,
  67                                  char *buf)
  68 {
  69         struct cca_info ci;
  70         struct ap_card *ac = to_ap_card(dev);
  71         struct zcrypt_card *zc = ac->private;
  72
  73         memset(&ci, 0, sizeof(ci));
  74
  75         if (ap_domain_index >= 0)
  76                 cca_get_info(ac->id, ap_domain_index, &ci, zc->online);
  77
  78         return scnprintf(buf, PAGE_SIZE, "%s\n", ci.serial);
  79 }
  80
  81 static struct device_attribute dev_attr_cca_serialnr =
  82         __ATTR(serialnr, 0444, cca_serialnr_show, NULL);
  83
  84 static struct attribute *cca_card_attrs[] = {
  85         &dev_attr_cca_serialnr.attr,
  86         NULL,
  87 };
  88
  89 static const struct attribute_group cca_card_attr_grp = {
  90         .attrs = cca_card_attrs,
  91 };
  92
  93  /*
  94   * CCA queue additional device attributes
  95   */
  96 static ssize_t cca_mkvps_show(struct device *dev,
  97                               struct device_attribute *attr,
  98                               char *buf)
  99 {
 100         int n = 0;
 101         struct cca_info ci;
 102         struct zcrypt_queue *zq = to_ap_queue(dev)->private;
 103         static const char * const cao_state[] = { "invalid", "valid" };
 104         static const char * const new_state[] = { "empty", "partial", "full" };
 105
 106         memset(&ci, 0, sizeof(ci));
 107
 108         cca_get_info(AP_QID_CARD(zq->queue->qid),
 109                      AP_QID_QUEUE(zq->queue->qid),
 110                      &ci, zq->online);
 111
 112         if (ci.new_aes_mk_state >= '1' && ci.new_aes_mk_state <= '3')
 113                 n = scnprintf(buf, PAGE_SIZE, "AES NEW: %s 0x%016llx\n",
 114                               new_state[ci.new_aes_mk_state - '1'],
 115                               ci.new_aes_mkvp);
 116         else
 117                 n = scnprintf(buf, PAGE_SIZE, "AES NEW: - -\n");
 118
 119         if (ci.cur_aes_mk_state >= '1' && ci.cur_aes_mk_state <= '2')
 120                 n += scnprintf(buf + n, PAGE_SIZE - n,
 121                                "AES CUR: %s 0x%016llx\n",
 122                                cao_state[ci.cur_aes_mk_state - '1'],
 123                                ci.cur_aes_mkvp);
 124         else
 125                 n += scnprintf(buf + n, PAGE_SIZE - n, "AES CUR: - -\n");
 126
 127         if (ci.old_aes_mk_state >= '1' && ci.old_aes_mk_state <= '2')
 128                 n += scnprintf(buf + n, PAGE_SIZE - n,
 129                                "AES OLD: %s 0x%016llx\n",
 130                                cao_state[ci.old_aes_mk_state - '1'],
 131                                ci.old_aes_mkvp);
 132         else
 133                 n += scnprintf(buf + n, PAGE_SIZE - n, "AES OLD: - -\n");
 134
 135         if (ci.new_apka_mk_state >= '1' && ci.new_apka_mk_state <= '3')
 136                 n += scnprintf(buf + n, PAGE_SIZE - n,
 137                                "APKA NEW: %s 0x%016llx\n",
 138                                new_state[ci.new_apka_mk_state - '1'],
 139                                ci.new_apka_mkvp);
 140         else
 141                 n += scnprintf(buf + n, PAGE_SIZE - n, "APKA NEW: - -\n");
 142
 143         if (ci.cur_apka_mk_state >= '1' && ci.cur_apka_mk_state <= '2')
 144                 n += scnprintf(buf + n, PAGE_SIZE - n,
 145                                "APKA CUR: %s 0x%016llx\n",
 146                                cao_state[ci.cur_apka_mk_state - '1'],
 147                                ci.cur_apka_mkvp);
 148         else
 149                 n += scnprintf(buf + n, PAGE_SIZE - n, "APKA CUR: - -\n");
 150
 151         if (ci.old_apka_mk_state >= '1' && ci.old_apka_mk_state <= '2')
 152                 n += scnprintf(buf + n, PAGE_SIZE - n,
 153                                "APKA OLD: %s 0x%016llx\n",
 154                                cao_state[ci.old_apka_mk_state - '1'],
 155                                ci.old_apka_mkvp);
 156         else
 157                 n += scnprintf(buf + n, PAGE_SIZE - n, "APKA OLD: - -\n");
 158
 159         return n;
 160 }
 161
 162 static struct device_attribute dev_attr_cca_mkvps =
 163         __ATTR(mkvps, 0444, cca_mkvps_show, NULL);
 164
 165 static struct attribute *cca_queue_attrs[] = {
 166         &dev_attr_cca_mkvps.attr,
 167         NULL,
 168 };
 169
 170 static const struct attribute_group cca_queue_attr_grp = {
 171         .attrs = cca_queue_attrs,
 172 };
 173
 174 /**
 175  * Large random number detection function. Its sends a message to a CEX2C/CEX3C
 176  * card to find out if large random numbers are supported.
 177  * @ap_dev: pointer to the AP device.
 178  *
 179  * Returns 1 if large random numbers are supported, 0 if not and < 0 on error.
 180  */
 181 static int zcrypt_cex2c_rng_supported(struct ap_queue *aq)
 182 {
 183         struct ap_message ap_msg;
 184         unsigned long long psmid;
 185         unsigned int domain;
 186         struct {
 187                 struct type86_hdr hdr;
 188                 struct type86_fmt2_ext fmt2;
 189                 struct CPRBX cprbx;
 190         } __packed *reply;
 191         struct {
 192                 struct type6_hdr hdr;
 193                 struct CPRBX cprbx;
 194                 char function_code[2];
 195                 short int rule_length;
 196                 char rule[8];
 197                 short int verb_length;
 198                 short int key_length;
 199         } __packed *msg;
 200         int rc, i;
 201
 202         ap_init_message(&ap_msg);
 203         ap_msg.msg = (void *) get_zeroed_page(GFP_KERNEL);
 204         if (!ap_msg.msg)
 205                 return -ENOMEM;
 206
 207         rng_type6CPRB_msgX(&ap_msg, 4, &domain);
 208
 209         msg = ap_msg.msg;
 210         msg->cprbx.domain = AP_QID_QUEUE(aq->qid);
 211
 212         rc = ap_send(aq->qid, 0x0102030405060708ULL, ap_msg.msg, ap_msg.len);
 213         if (rc)
 214                 goto out_free;
 215
 216         /* Wait for the test message to complete. */
 217         for (i = 0; i < 2 * HZ; i++) {
 218                 msleep(1000 / HZ);
 219                 rc = ap_recv(aq->qid, &psmid, ap_msg.msg, 4096);
 220                 if (rc == 0 && psmid == 0x0102030405060708ULL)
 221                         break;
 222         }
 223
 224         if (i >= 2 * HZ) {
 225                 /* Got no answer. */
 226                 rc = -ENODEV;
 227                 goto out_free;
 228         }
 229
 230         reply = ap_msg.msg;
 231         if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0)
 232                 rc = 1;
 233         else
 234                 rc = 0;
 235 out_free:
 236         free_page((unsigned long) ap_msg.msg);
 237         return rc;
 238 }
 239
 240 /**
 241  * Probe function for CEX2C/CEX3C card devices. It always accepts the
 242  * AP device since the bus_match already checked the hardware type.
 243  * @ap_dev: pointer to the AP card device.
 244  */
 245 static int zcrypt_cex2c_card_probe(struct ap_device *ap_dev)
 246 {
 247         /*
 248          * Normalized speed ratings per crypto adapter
 249          * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
 250          */
 251         static const int CEX2C_SPEED_IDX[] = {
 252                 1000, 1400, 2400, 1100, 1500, 2600, 100, 12};
 253         static const int CEX3C_SPEED_IDX[] = {
 254                 500,  700, 1400,  550,  800, 1500,  80, 10};
 255
 256         struct ap_card *ac = to_ap_card(&ap_dev->device);
 257         struct zcrypt_card *zc;
 258         int rc = 0;
 259
 260         zc = zcrypt_card_alloc();
 261         if (!zc)
 262                 return -ENOMEM;
 263         zc->card = ac;
 264         ac->private = zc;
 265         switch (ac->ap_dev.device_type) {
 266         case AP_DEVICE_TYPE_CEX2C:
 267                 zc->user_space_type = ZCRYPT_CEX2C;
 268                 zc->type_string = "CEX2C";
 269                 zc->speed_rating = CEX2C_SPEED_IDX;
 270                 zc->min_mod_size = CEX2C_MIN_MOD_SIZE;
 271                 zc->max_mod_size = CEX2C_MAX_MOD_SIZE;
 272                 zc->max_exp_bit_length = CEX2C_MAX_MOD_SIZE;
 273                 break;
 274         case AP_DEVICE_TYPE_CEX3C:
 275                 zc->user_space_type = ZCRYPT_CEX3C;
 276                 zc->type_string = "CEX3C";
 277                 zc->speed_rating = CEX3C_SPEED_IDX;
 278                 zc->min_mod_size = CEX3C_MIN_MOD_SIZE;
 279                 zc->max_mod_size = CEX3C_MAX_MOD_SIZE;
 280                 zc->max_exp_bit_length = CEX3C_MAX_MOD_SIZE;
 281                 break;
 282         default:
 283                 zcrypt_card_free(zc);
 284                 return -ENODEV;
 285         }
 286         zc->online = 1;
 287
 288         rc = zcrypt_card_register(zc);
 289         if (rc) {
 290                 ac->private = NULL;
 291                 zcrypt_card_free(zc);
 292                 return rc;
 293         }
 294
 295         if (ap_test_bit(&ac->functions, AP_FUNC_COPRO)) {
 296                 rc = sysfs_create_group(&ap_dev->device.kobj,
 297                                         &cca_card_attr_grp);
 298                 if (rc) {
 299                         zcrypt_card_unregister(zc);
 300                         ac->private = NULL;
 301                         zcrypt_card_free(zc);
 302                 }
 303         }
 304
 305         return rc;
 306 }
 307
 308 /**
 309  * This is called to remove the CEX2C/CEX3C card driver information
 310  * if an AP card device is removed.
 311  */
 312 static void zcrypt_cex2c_card_remove(struct ap_device *ap_dev)
 313 {
 314         struct ap_card *ac = to_ap_card(&ap_dev->device);
 315         struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
 316
 317         if (ap_test_bit(&ac->functions, AP_FUNC_COPRO))
 318                 sysfs_remove_group(&ap_dev->device.kobj, &cca_card_attr_grp);
 319         if (zc)
 320                 zcrypt_card_unregister(zc);
 321 }
 322
 323 static struct ap_driver zcrypt_cex2c_card_driver = {
 324         .probe = zcrypt_cex2c_card_probe,
 325         .remove = zcrypt_cex2c_card_remove,
 326         .ids = zcrypt_cex2c_card_ids,
 327         .flags = AP_DRIVER_FLAG_DEFAULT,
 328 };
 329
 330 /**
 331  * Probe function for CEX2C/CEX3C queue devices. It always accepts the
 332  * AP device since the bus_match already checked the hardware type.
 333  * @ap_dev: pointer to the AP card device.
 334  */
 335 static int zcrypt_cex2c_queue_probe(struct ap_device *ap_dev)
 336 {
 337         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 338         struct zcrypt_queue *zq;
 339         int rc;
 340
 341         zq = zcrypt_queue_alloc(CEX2C_MAX_XCRB_MESSAGE_SIZE);
 342         if (!zq)
 343                 return -ENOMEM;
 344         zq->queue = aq;
 345         zq->online = 1;
 346         atomic_set(&zq->load, 0);
 347         ap_rapq(aq->qid);
 348         rc = zcrypt_cex2c_rng_supported(aq);
 349         if (rc < 0) {
 350                 zcrypt_queue_free(zq);
 351                 return rc;
 352         }
 353         if (rc)
 354                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 355                                          MSGTYPE06_VARIANT_DEFAULT);
 356         else
 357                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 358                                          MSGTYPE06_VARIANT_NORNG);
 359         ap_queue_init_state(aq);
 360         ap_queue_init_reply(aq, &zq->reply);
 361         aq->request_timeout = CEX2C_CLEANUP_TIME;
 362         aq->private = zq;
 363         rc = zcrypt_queue_register(zq);
 364         if (rc) {
 365                 aq->private = NULL;
 366                 zcrypt_queue_free(zq);
 367                 return rc;
 368         }
 369
 370         if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) {
 371                 rc = sysfs_create_group(&ap_dev->device.kobj,
 372                                         &cca_queue_attr_grp);
 373                 if (rc) {
 374                         zcrypt_queue_unregister(zq);
 375                         aq->private = NULL;
 376                         zcrypt_queue_free(zq);
 377                 }
 378         }
 379
 380         return rc;
 381 }
 382
 383 /**
 384  * This is called to remove the CEX2C/CEX3C queue driver information
 385  * if an AP queue device is removed.
 386  */
 387 static void zcrypt_cex2c_queue_remove(struct ap_device *ap_dev)
 388 {
 389         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 390         struct zcrypt_queue *zq = aq->private;
 391
 392         if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO))
 393                 sysfs_remove_group(&ap_dev->device.kobj, &cca_queue_attr_grp);
 394         if (zq)
 395                 zcrypt_queue_unregister(zq);
 396 }
 397
 398 static struct ap_driver zcrypt_cex2c_queue_driver = {
 399         .probe = zcrypt_cex2c_queue_probe,
 400         .remove = zcrypt_cex2c_queue_remove,
 401         .ids = zcrypt_cex2c_queue_ids,
 402         .flags = AP_DRIVER_FLAG_DEFAULT,
 403 };
 404
 405 int __init zcrypt_cex2c_init(void)
 406 {
 407         int rc;
 408
 409         rc = ap_driver_register(&zcrypt_cex2c_card_driver,
 410                                 THIS_MODULE, "cex2card");
 411         if (rc)
 412                 return rc;
 413
 414         rc = ap_driver_register(&zcrypt_cex2c_queue_driver,
 415                                 THIS_MODULE, "cex2cqueue");
 416         if (rc)
 417                 ap_driver_unregister(&zcrypt_cex2c_card_driver);
 418
 419         return rc;
 420 }
 421
 422 void zcrypt_cex2c_exit(void)
 423 {
 424         ap_driver_unregister(&zcrypt_cex2c_queue_driver);
 425         ap_driver_unregister(&zcrypt_cex2c_card_driver);
 426 }
 427
 428 module_init(zcrypt_cex2c_init);
 429 module_exit(zcrypt_cex2c_exit);