drivers/s390/crypto/zcrypt_pcixcc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  zcrypt 2.1.0
   4  *
   5  *  Copyright IBM Corp. 2001, 2012
   6  *  Author(s): Robert Burroughs
   7  *             Eric Rossman (edrossma@us.ibm.com)
   8  *
   9  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
  10  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
  11  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
  12  *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/delay.h>
  19 #include <linux/slab.h>
  20 #include <linux/atomic.h>
  21 #include <linux/uaccess.h>
  22 #include <linux/mod_devicetable.h>
  23
  24 #include "ap_bus.h"
  25 #include "zcrypt_api.h"
  26 #include "zcrypt_error.h"
  27 #include "zcrypt_msgtype6.h"
  28 #include "zcrypt_pcixcc.h"
  29 #include "zcrypt_cca_key.h"
  30
  31 #define PCIXCC_MIN_MOD_SIZE      16     /*  128 bits    */
  32 #define PCIXCC_MIN_MOD_SIZE_OLD  64     /*  512 bits    */
  33 #define PCIXCC_MAX_MOD_SIZE     256     /* 2048 bits    */
  34 #define CEX3C_MIN_MOD_SIZE      PCIXCC_MIN_MOD_SIZE
  35 #define CEX3C_MAX_MOD_SIZE      512     /* 4096 bits    */
  36
  37 #define PCIXCC_MAX_ICA_MESSAGE_SIZE 0x77c  /* max size type6 v2 crt message */
  38 #define PCIXCC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply      */
  39
  40 #define PCIXCC_MAX_XCRB_MESSAGE_SIZE (12*1024)
  41
  42 #define PCIXCC_CLEANUP_TIME     (15*HZ)
  43
  44 #define CEIL4(x) ((((x)+3)/4)*4)
  45
  46 struct response_type {
  47         struct completion work;
  48         int type;
  49 };
  50 #define PCIXCC_RESPONSE_TYPE_ICA  0
  51 #define PCIXCC_RESPONSE_TYPE_XCRB 1
  52
  53 MODULE_AUTHOR("IBM Corporation");
  54 MODULE_DESCRIPTION("PCIXCC Cryptographic Coprocessor device driver, " \
  55                    "Copyright IBM Corp. 2001, 2012");
  56 MODULE_LICENSE("GPL");
  57
  58 static struct ap_device_id zcrypt_pcixcc_card_ids[] = {
  59         { .dev_type = AP_DEVICE_TYPE_PCIXCC,
  60           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  61         { .dev_type = AP_DEVICE_TYPE_CEX2C,
  62           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  63         { .dev_type = AP_DEVICE_TYPE_CEX3C,
  64           .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
  65         { /* end of list */ },
  66 };
  67
  68 MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_card_ids);
  69
  70 static struct ap_device_id zcrypt_pcixcc_queue_ids[] = {
  71         { .dev_type = AP_DEVICE_TYPE_PCIXCC,
  72           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  73         { .dev_type = AP_DEVICE_TYPE_CEX2C,
  74           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  75         { .dev_type = AP_DEVICE_TYPE_CEX3C,
  76           .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
  77         { /* end of list */ },
  78 };
  79
  80 MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_queue_ids);
  81
  82 /**
  83  * Large random number detection function. Its sends a message to a pcixcc
  84  * card to find out if large random numbers are supported.
  85  * @ap_dev: pointer to the AP device.
  86  *
  87  * Returns 1 if large random numbers are supported, 0 if not and < 0 on error.
  88  */
  89 static int zcrypt_pcixcc_rng_supported(struct ap_queue *aq)
  90 {
  91         struct ap_message ap_msg;
  92         unsigned long long psmid;
  93         unsigned int domain;
  94         struct {
  95                 struct type86_hdr hdr;
  96                 struct type86_fmt2_ext fmt2;
  97                 struct CPRBX cprbx;
  98         } __packed *reply;
  99         struct {
 100                 struct type6_hdr hdr;
 101                 struct CPRBX cprbx;
 102                 char function_code[2];
 103                 short int rule_length;
 104                 char rule[8];
 105                 short int verb_length;
 106                 short int key_length;
 107         } __packed *msg;
 108         int rc, i;
 109
 110         ap_init_message(&ap_msg);
 111         ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
 112         if (!ap_msg.message)
 113                 return -ENOMEM;
 114
 115         rng_type6CPRB_msgX(&ap_msg, 4, &domain);
 116
 117         msg = ap_msg.message;
 118         msg->cprbx.domain = AP_QID_QUEUE(aq->qid);
 119
 120         rc = ap_send(aq->qid, 0x0102030405060708ULL, ap_msg.message,
 121                      ap_msg.length);
 122         if (rc)
 123                 goto out_free;
 124
 125         /* Wait for the test message to complete. */
 126         for (i = 0; i < 2 * HZ; i++) {
 127                 msleep(1000 / HZ);
 128                 rc = ap_recv(aq->qid, &psmid, ap_msg.message, 4096);
 129                 if (rc == 0 && psmid == 0x0102030405060708ULL)
 130                         break;
 131         }
 132
 133         if (i >= 2 * HZ) {
 134                 /* Got no answer. */
 135                 rc = -ENODEV;
 136                 goto out_free;
 137         }
 138
 139         reply = ap_msg.message;
 140         if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0)
 141                 rc = 1;
 142         else
 143                 rc = 0;
 144 out_free:
 145         free_page((unsigned long) ap_msg.message);
 146         return rc;
 147 }
 148
 149 /**
 150  * Probe function for PCIXCC/CEX2C card devices. It always accepts the
 151  * AP device since the bus_match already checked the hardware type. The
 152  * PCIXCC cards come in two flavours: micro code level 2 and micro code
 153  * level 3. This is checked by sending a test message to the device.
 154  * @ap_dev: pointer to the AP card device.
 155  */
 156 static int zcrypt_pcixcc_card_probe(struct ap_device *ap_dev)
 157 {
 158         /*
 159          * Normalized speed ratings per crypto adapter
 160          * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
 161          */
 162         static const int CEX2C_SPEED_IDX[] = {
 163                 1000, 1400, 2400, 1100, 1500, 2600, 100, 12};
 164         static const int CEX3C_SPEED_IDX[] = {
 165                 500,  700, 1400,  550,  800, 1500,  80, 10};
 166
 167         struct ap_card *ac = to_ap_card(&ap_dev->device);
 168         struct zcrypt_card *zc;
 169         int rc = 0;
 170
 171         zc = zcrypt_card_alloc();
 172         if (!zc)
 173                 return -ENOMEM;
 174         zc->card = ac;
 175         ac->private = zc;
 176         switch (ac->ap_dev.device_type) {
 177         case AP_DEVICE_TYPE_CEX2C:
 178                 zc->user_space_type = ZCRYPT_CEX2C;
 179                 zc->type_string = "CEX2C";
 180                 memcpy(zc->speed_rating, CEX2C_SPEED_IDX,
 181                        sizeof(CEX2C_SPEED_IDX));
 182                 zc->min_mod_size = PCIXCC_MIN_MOD_SIZE;
 183                 zc->max_mod_size = PCIXCC_MAX_MOD_SIZE;
 184                 zc->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
 185                 break;
 186         case AP_DEVICE_TYPE_CEX3C:
 187                 zc->user_space_type = ZCRYPT_CEX3C;
 188                 zc->type_string = "CEX3C";
 189                 memcpy(zc->speed_rating, CEX3C_SPEED_IDX,
 190                        sizeof(CEX3C_SPEED_IDX));
 191                 zc->min_mod_size = CEX3C_MIN_MOD_SIZE;
 192                 zc->max_mod_size = CEX3C_MAX_MOD_SIZE;
 193                 zc->max_exp_bit_length = CEX3C_MAX_MOD_SIZE;
 194                 break;
 195         default:
 196                 zcrypt_card_free(zc);
 197                 return -ENODEV;
 198         }
 199         zc->online = 1;
 200
 201         rc = zcrypt_card_register(zc);
 202         if (rc) {
 203                 ac->private = NULL;
 204                 zcrypt_card_free(zc);
 205         }
 206
 207         return rc;
 208 }
 209
 210 /**
 211  * This is called to remove the PCIXCC/CEX2C card driver information
 212  * if an AP card device is removed.
 213  */
 214 static void zcrypt_pcixcc_card_remove(struct ap_device *ap_dev)
 215 {
 216         struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
 217
 218         if (zc)
 219                 zcrypt_card_unregister(zc);
 220 }
 221
 222 static struct ap_driver zcrypt_pcixcc_card_driver = {
 223         .probe = zcrypt_pcixcc_card_probe,
 224         .remove = zcrypt_pcixcc_card_remove,
 225         .ids = zcrypt_pcixcc_card_ids,
 226         .flags = AP_DRIVER_FLAG_DEFAULT,
 227 };
 228
 229 /**
 230  * Probe function for PCIXCC/CEX2C queue devices. It always accepts the
 231  * AP device since the bus_match already checked the hardware type. The
 232  * PCIXCC cards come in two flavours: micro code level 2 and micro code
 233  * level 3. This is checked by sending a test message to the device.
 234  * @ap_dev: pointer to the AP card device.
 235  */
 236 static int zcrypt_pcixcc_queue_probe(struct ap_device *ap_dev)
 237 {
 238         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 239         struct zcrypt_queue *zq;
 240         int rc;
 241
 242         zq = zcrypt_queue_alloc(PCIXCC_MAX_XCRB_MESSAGE_SIZE);
 243         if (!zq)
 244                 return -ENOMEM;
 245         zq->queue = aq;
 246         zq->online = 1;
 247         atomic_set(&zq->load, 0);
 248         rc = zcrypt_pcixcc_rng_supported(aq);
 249         if (rc < 0) {
 250                 zcrypt_queue_free(zq);
 251                 return rc;
 252         }
 253         if (rc)
 254                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 255                                          MSGTYPE06_VARIANT_DEFAULT);
 256         else
 257                 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 258                                          MSGTYPE06_VARIANT_NORNG);
 259         ap_queue_init_reply(aq, &zq->reply);
 260         aq->request_timeout = PCIXCC_CLEANUP_TIME,
 261         aq->private = zq;
 262         rc = zcrypt_queue_register(zq);
 263         if (rc) {
 264                 aq->private = NULL;
 265                 zcrypt_queue_free(zq);
 266         }
 267         return rc;
 268 }
 269
 270 /**
 271  * This is called to remove the PCIXCC/CEX2C queue driver information
 272  * if an AP queue device is removed.
 273  */
 274 static void zcrypt_pcixcc_queue_remove(struct ap_device *ap_dev)
 275 {
 276         struct ap_queue *aq = to_ap_queue(&ap_dev->device);
 277         struct zcrypt_queue *zq = aq->private;
 278
 279         ap_queue_remove(aq);
 280         if (zq)
 281                 zcrypt_queue_unregister(zq);
 282 }
 283
 284 static struct ap_driver zcrypt_pcixcc_queue_driver = {
 285         .probe = zcrypt_pcixcc_queue_probe,
 286         .remove = zcrypt_pcixcc_queue_remove,
 287         .suspend = ap_queue_suspend,
 288         .resume = ap_queue_resume,
 289         .ids = zcrypt_pcixcc_queue_ids,
 290         .flags = AP_DRIVER_FLAG_DEFAULT,
 291 };
 292
 293 int __init zcrypt_pcixcc_init(void)
 294 {
 295         int rc;
 296
 297         rc = ap_driver_register(&zcrypt_pcixcc_card_driver,
 298                                 THIS_MODULE, "pcixcccard");
 299         if (rc)
 300                 return rc;
 301
 302         rc = ap_driver_register(&zcrypt_pcixcc_queue_driver,
 303                                 THIS_MODULE, "pcixccqueue");
 304         if (rc)
 305                 ap_driver_unregister(&zcrypt_pcixcc_card_driver);
 306
 307         return rc;
 308 }
 309
 310 void zcrypt_pcixcc_exit(void)
 311 {
 312         ap_driver_unregister(&zcrypt_pcixcc_queue_driver);
 313         ap_driver_unregister(&zcrypt_pcixcc_card_driver);
 314 }
 315
 316 module_init(zcrypt_pcixcc_init);
 317 module_exit(zcrypt_pcixcc_exit);