kernel/drivers/s390/crypto/zcrypt_pcixcc.c

   1 /*
   2  *  zcrypt 2.1.0
   3  *
   4  *  Copyright IBM Corp. 2001, 2012
   5  *  Author(s): Robert Burroughs
   6  *             Eric Rossman (edrossma@us.ibm.com)
   7  *
   8  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
   9  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
  10  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
  11  *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2, or (at your option)
  16  * any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/err.h>
  31 #include <linux/delay.h>
  32 #include <linux/slab.h>
  33 #include <linux/atomic.h>
  34 #include <asm/uaccess.h>
  35
  36 #include "ap_bus.h"
  37 #include "zcrypt_api.h"
  38 #include "zcrypt_error.h"
  39 #include "zcrypt_msgtype6.h"
  40 #include "zcrypt_pcixcc.h"
  41 #include "zcrypt_cca_key.h"
  42
  43 #define PCIXCC_MIN_MOD_SIZE      16     /*  128 bits    */
  44 #define PCIXCC_MIN_MOD_SIZE_OLD  64     /*  512 bits    */
  45 #define PCIXCC_MAX_MOD_SIZE     256     /* 2048 bits    */
  46 #define CEX3C_MIN_MOD_SIZE      PCIXCC_MIN_MOD_SIZE
  47 #define CEX3C_MAX_MOD_SIZE      512     /* 4096 bits    */
  48
  49 #define PCIXCC_MCL2_SPEED_RATING        7870
  50 #define PCIXCC_MCL3_SPEED_RATING        7870
  51 #define CEX2C_SPEED_RATING              7000
  52 #define CEX3C_SPEED_RATING              6500
  53
  54 #define PCIXCC_MAX_ICA_MESSAGE_SIZE 0x77c  /* max size type6 v2 crt message */
  55 #define PCIXCC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply      */
  56
  57 #define PCIXCC_MAX_XCRB_MESSAGE_SIZE (12*1024)
  58
  59 #define PCIXCC_CLEANUP_TIME     (15*HZ)
  60
  61 #define CEIL4(x) ((((x)+3)/4)*4)
  62
  63 struct response_type {
  64         struct completion work;
  65         int type;
  66 };
  67 #define PCIXCC_RESPONSE_TYPE_ICA  0
  68 #define PCIXCC_RESPONSE_TYPE_XCRB 1
  69
  70 static struct ap_device_id zcrypt_pcixcc_ids[] = {
  71         { AP_DEVICE(AP_DEVICE_TYPE_PCIXCC) },
  72         { AP_DEVICE(AP_DEVICE_TYPE_CEX2C) },
  73         { AP_DEVICE(AP_DEVICE_TYPE_CEX3C) },
  74         { /* end of list */ },
  75 };
  76
  77 MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_ids);
  78 MODULE_AUTHOR("IBM Corporation");
  79 MODULE_DESCRIPTION("PCIXCC Cryptographic Coprocessor device driver, " \
  80                    "Copyright IBM Corp. 2001, 2012");
  81 MODULE_LICENSE("GPL");
  82
  83 static int zcrypt_pcixcc_probe(struct ap_device *ap_dev);
  84 static void zcrypt_pcixcc_remove(struct ap_device *ap_dev);
  85
  86 static struct ap_driver zcrypt_pcixcc_driver = {
  87         .probe = zcrypt_pcixcc_probe,
  88         .remove = zcrypt_pcixcc_remove,
  89         .ids = zcrypt_pcixcc_ids,
  90         .request_timeout = PCIXCC_CLEANUP_TIME,
  91 };
  92
  93 /**
  94  * Micro-code detection function. Its sends a message to a pcixcc card
  95  * to find out the microcode level.
  96  * @ap_dev: pointer to the AP device.
  97  */
  98 static int zcrypt_pcixcc_mcl(struct ap_device *ap_dev)
  99 {
 100         static unsigned char msg[] = {
 101                 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,
 102                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 103                 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,
 104                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 105                 0x43,0x41,0x00,0x00,0x00,0x00,0x00,0x00,
 106                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 107                 0x00,0x00,0x00,0x00,0x50,0x4B,0x00,0x00,
 108                 0x00,0x00,0x01,0xC4,0x00,0x00,0x00,0x00,
 109                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 110                 0x00,0x00,0x07,0x24,0x00,0x00,0x00,0x00,
 111                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 112                 0x00,0xDC,0x02,0x00,0x00,0x00,0x54,0x32,
 113                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE8,
 114                 0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x24,
 115                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 116                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 117                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 118                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 119                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 120                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 121                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 122                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 123                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 124                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 125                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 126                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 127                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 128                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 129                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 130                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 131                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 132                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 133                 0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00,
 134                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 135                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 136                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 137                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 138                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 139                 0x00,0x00,0x00,0x00,0x50,0x4B,0x00,0x0A,
 140                 0x4D,0x52,0x50,0x20,0x20,0x20,0x20,0x20,
 141                 0x00,0x42,0x00,0x01,0x02,0x03,0x04,0x05,
 142                 0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,
 143                 0x0E,0x0F,0x00,0x11,0x22,0x33,0x44,0x55,
 144                 0x66,0x77,0x88,0x99,0xAA,0xBB,0xCC,0xDD,
 145                 0xEE,0xFF,0xFF,0xEE,0xDD,0xCC,0xBB,0xAA,
 146                 0x99,0x88,0x77,0x66,0x55,0x44,0x33,0x22,
 147                 0x11,0x00,0x01,0x23,0x45,0x67,0x89,0xAB,
 148                 0xCD,0xEF,0xFE,0xDC,0xBA,0x98,0x76,0x54,
 149                 0x32,0x10,0x00,0x9A,0x00,0x98,0x00,0x00,
 150                 0x1E,0x00,0x00,0x94,0x00,0x00,0x00,0x00,
 151                 0x04,0x00,0x00,0x8C,0x00,0x00,0x00,0x40,
 152                 0x02,0x00,0x00,0x40,0xBA,0xE8,0x23,0x3C,
 153                 0x75,0xF3,0x91,0x61,0xD6,0x73,0x39,0xCF,
 154                 0x7B,0x6D,0x8E,0x61,0x97,0x63,0x9E,0xD9,
 155                 0x60,0x55,0xD6,0xC7,0xEF,0xF8,0x1E,0x63,
 156                 0x95,0x17,0xCC,0x28,0x45,0x60,0x11,0xC5,
 157                 0xC4,0x4E,0x66,0xC6,0xE6,0xC3,0xDE,0x8A,
 158                 0x19,0x30,0xCF,0x0E,0xD7,0xAA,0xDB,0x01,
 159                 0xD8,0x00,0xBB,0x8F,0x39,0x9F,0x64,0x28,
 160                 0xF5,0x7A,0x77,0x49,0xCC,0x6B,0xA3,0x91,
 161                 0x97,0x70,0xE7,0x60,0x1E,0x39,0xE1,0xE5,
 162                 0x33,0xE1,0x15,0x63,0x69,0x08,0x80,0x4C,
 163                 0x67,0xC4,0x41,0x8F,0x48,0xDF,0x26,0x98,
 164                 0xF1,0xD5,0x8D,0x88,0xD9,0x6A,0xA4,0x96,
 165                 0xC5,0x84,0xD9,0x30,0x49,0x67,0x7D,0x19,
 166                 0xB1,0xB3,0x45,0x4D,0xB2,0x53,0x9A,0x47,
 167                 0x3C,0x7C,0x55,0xBF,0xCC,0x85,0x00,0x36,
 168                 0xF1,0x3D,0x93,0x53
 169         };
 170         unsigned long long psmid;
 171         struct CPRBX *cprbx;
 172         char *reply;
 173         int rc, i;
 174
 175         reply = (void *) get_zeroed_page(GFP_KERNEL);
 176         if (!reply)
 177                 return -ENOMEM;
 178
 179         rc = ap_send(ap_dev->qid, 0x0102030405060708ULL, msg, sizeof(msg));
 180         if (rc)
 181                 goto out_free;
 182
 183         /* Wait for the test message to complete. */
 184         for (i = 0; i < 6; i++) {
 185                 mdelay(300);
 186                 rc = ap_recv(ap_dev->qid, &psmid, reply, 4096);
 187                 if (rc == 0 && psmid == 0x0102030405060708ULL)
 188                         break;
 189         }
 190
 191         if (i >= 6) {
 192                 /* Got no answer. */
 193                 rc = -ENODEV;
 194                 goto out_free;
 195         }
 196
 197         cprbx = (struct CPRBX *) (reply + 48);
 198         if (cprbx->ccp_rtcode == 8 && cprbx->ccp_rscode == 33)
 199                 rc = ZCRYPT_PCIXCC_MCL2;
 200         else
 201                 rc = ZCRYPT_PCIXCC_MCL3;
 202 out_free:
 203         free_page((unsigned long) reply);
 204         return rc;
 205 }
 206
 207 /**
 208  * Large random number detection function. Its sends a message to a pcixcc
 209  * card to find out if large random numbers are supported.
 210  * @ap_dev: pointer to the AP device.
 211  *
 212  * Returns 1 if large random numbers are supported, 0 if not and < 0 on error.
 213  */
 214 static int zcrypt_pcixcc_rng_supported(struct ap_device *ap_dev)
 215 {
 216         struct ap_message ap_msg;
 217         unsigned long long psmid;
 218         struct {
 219                 struct type86_hdr hdr;
 220                 struct type86_fmt2_ext fmt2;
 221                 struct CPRBX cprbx;
 222         } __attribute__((packed)) *reply;
 223         int rc, i;
 224
 225         ap_init_message(&ap_msg);
 226         ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
 227         if (!ap_msg.message)
 228                 return -ENOMEM;
 229
 230         rng_type6CPRB_msgX(ap_dev, &ap_msg, 4);
 231         rc = ap_send(ap_dev->qid, 0x0102030405060708ULL, ap_msg.message,
 232                      ap_msg.length);
 233         if (rc)
 234                 goto out_free;
 235
 236         /* Wait for the test message to complete. */
 237         for (i = 0; i < 2 * HZ; i++) {
 238                 msleep(1000 / HZ);
 239                 rc = ap_recv(ap_dev->qid, &psmid, ap_msg.message, 4096);
 240                 if (rc == 0 && psmid == 0x0102030405060708ULL)
 241                         break;
 242         }
 243
 244         if (i >= 2 * HZ) {
 245                 /* Got no answer. */
 246                 rc = -ENODEV;
 247                 goto out_free;
 248         }
 249
 250         reply = ap_msg.message;
 251         if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0)
 252                 rc = 1;
 253         else
 254                 rc = 0;
 255 out_free:
 256         free_page((unsigned long) ap_msg.message);
 257         return rc;
 258 }
 259
 260 /**
 261  * Probe function for PCIXCC/CEX2C cards. It always accepts the AP device
 262  * since the bus_match already checked the hardware type. The PCIXCC
 263  * cards come in two flavours: micro code level 2 and micro code level 3.
 264  * This is checked by sending a test message to the device.
 265  * @ap_dev: pointer to the AP device.
 266  */
 267 static int zcrypt_pcixcc_probe(struct ap_device *ap_dev)
 268 {
 269         struct zcrypt_device *zdev;
 270         int rc = 0;
 271
 272         zdev = zcrypt_device_alloc(PCIXCC_MAX_XCRB_MESSAGE_SIZE);
 273         if (!zdev)
 274                 return -ENOMEM;
 275         zdev->ap_dev = ap_dev;
 276         zdev->online = 1;
 277         switch (ap_dev->device_type) {
 278         case AP_DEVICE_TYPE_PCIXCC:
 279                 rc = zcrypt_pcixcc_mcl(ap_dev);
 280                 if (rc < 0) {
 281                         zcrypt_device_free(zdev);
 282                         return rc;
 283                 }
 284                 zdev->user_space_type = rc;
 285                 if (rc == ZCRYPT_PCIXCC_MCL2) {
 286                         zdev->type_string = "PCIXCC_MCL2";
 287                         zdev->speed_rating = PCIXCC_MCL2_SPEED_RATING;
 288                         zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE_OLD;
 289                         zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE;
 290                         zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
 291                 } else {
 292                         zdev->type_string = "PCIXCC_MCL3";
 293                         zdev->speed_rating = PCIXCC_MCL3_SPEED_RATING;
 294                         zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE;
 295                         zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE;
 296                         zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
 297                 }
 298                 break;
 299         case AP_DEVICE_TYPE_CEX2C:
 300                 zdev->user_space_type = ZCRYPT_CEX2C;
 301                 zdev->type_string = "CEX2C";
 302                 zdev->speed_rating = CEX2C_SPEED_RATING;
 303                 zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE;
 304                 zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE;
 305                 zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
 306                 break;
 307         case AP_DEVICE_TYPE_CEX3C:
 308                 zdev->user_space_type = ZCRYPT_CEX3C;
 309                 zdev->type_string = "CEX3C";
 310                 zdev->speed_rating = CEX3C_SPEED_RATING;
 311                 zdev->min_mod_size = CEX3C_MIN_MOD_SIZE;
 312                 zdev->max_mod_size = CEX3C_MAX_MOD_SIZE;
 313                 zdev->max_exp_bit_length = CEX3C_MAX_MOD_SIZE;
 314                 break;
 315         default:
 316                 goto out_free;
 317         }
 318
 319         rc = zcrypt_pcixcc_rng_supported(ap_dev);
 320         if (rc < 0) {
 321                 zcrypt_device_free(zdev);
 322                 return rc;
 323         }
 324         if (rc)
 325                 zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
 326                                                    MSGTYPE06_VARIANT_DEFAULT);
 327         else
 328                 zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
 329                                                    MSGTYPE06_VARIANT_NORNG);
 330         ap_dev->reply = &zdev->reply;
 331         ap_dev->private = zdev;
 332         rc = zcrypt_device_register(zdev);
 333         if (rc)
 334                 goto out_free;
 335         return 0;
 336
 337  out_free:
 338         ap_dev->private = NULL;
 339         zcrypt_msgtype_release(zdev->ops);
 340         zcrypt_device_free(zdev);
 341         return rc;
 342 }
 343
 344 /**
 345  * This is called to remove the extended PCIXCC/CEX2C driver information
 346  * if an AP device is removed.
 347  */
 348 static void zcrypt_pcixcc_remove(struct ap_device *ap_dev)
 349 {
 350         struct zcrypt_device *zdev = ap_dev->private;
 351         struct zcrypt_ops *zops = zdev->ops;
 352
 353         zcrypt_device_unregister(zdev);
 354         zcrypt_msgtype_release(zops);
 355 }
 356
 357 int __init zcrypt_pcixcc_init(void)
 358 {
 359         return ap_driver_register(&zcrypt_pcixcc_driver, THIS_MODULE, "pcixcc");
 360 }
 361
 362 void zcrypt_pcixcc_exit(void)
 363 {
 364         ap_driver_unregister(&zcrypt_pcixcc_driver);
 365 }
 366
 367 module_init(zcrypt_pcixcc_init);
 368 module_exit(zcrypt_pcixcc_exit);