drivers/s390/char/tape_3590.c

   1 /*
   2  *  drivers/s390/char/tape_3590.c
   3  *    tape device discipline for 3590 tapes.
   4  *
   5  *    Copyright IBM Corp. 2001,2006
   6  *    Author(s): Stefan Bader <shbader@de.ibm.com>
   7  *               Michael Holzheu <holzheu@de.ibm.com>
   8  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/bio.h>
  14 #include <asm/ebcdic.h>
  15
  16 #define TAPE_DBF_AREA   tape_3590_dbf
  17
  18 #include "tape.h"
  19 #include "tape_std.h"
  20 #include "tape_3590.h"
  21
  22 /*
  23  * Pointer to debug area.
  24  */
  25 debug_info_t *TAPE_DBF_AREA = NULL;
  26 EXPORT_SYMBOL(TAPE_DBF_AREA);
  27
  28 /*******************************************************************
  29  * Error Recovery fuctions:
  30  * - Read Opposite:              implemented
  31  * - Read Device (buffered) log: BRA
  32  * - Read Library log:           BRA
  33  * - Swap Devices:               BRA
  34  * - Long Busy:                  implemented
  35  * - Special Intercept:          BRA
  36  * - Read Alternate:             implemented
  37  *******************************************************************/
  38
  39 #define PRINTK_HEADER "TAPE_3590: "
  40
  41 static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = {
  42         [0x00] = "",
  43         [0x10] = "Lost Sense",
  44         [0x11] = "Assigned Elsewhere",
  45         [0x12] = "Allegiance Reset",
  46         [0x13] = "Shared Access Violation",
  47         [0x20] = "Command Reject",
  48         [0x21] = "Configuration Error",
  49         [0x22] = "Protection Exception",
  50         [0x23] = "Write Protect",
  51         [0x24] = "Write Length",
  52         [0x25] = "Read-Only Format",
  53         [0x31] = "Beginning of Partition",
  54         [0x33] = "End of Partition",
  55         [0x34] = "End of Data",
  56         [0x35] = "Block not found",
  57         [0x40] = "Device Intervention",
  58         [0x41] = "Loader Intervention",
  59         [0x42] = "Library Intervention",
  60         [0x50] = "Write Error",
  61         [0x51] = "Erase Error",
  62         [0x52] = "Formatting Error",
  63         [0x53] = "Read Error",
  64         [0x54] = "Unsupported Format",
  65         [0x55] = "No Formatting",
  66         [0x56] = "Positioning lost",
  67         [0x57] = "Read Length",
  68         [0x60] = "Unsupported Medium",
  69         [0x61] = "Medium Length Error",
  70         [0x62] = "Medium removed",
  71         [0x64] = "Load Check",
  72         [0x65] = "Unload Check",
  73         [0x70] = "Equipment Check",
  74         [0x71] = "Bus out Check",
  75         [0x72] = "Protocol Error",
  76         [0x73] = "Interface Error",
  77         [0x74] = "Overrun",
  78         [0x75] = "Halt Signal",
  79         [0x90] = "Device fenced",
  80         [0x91] = "Device Path fenced",
  81         [0xa0] = "Volume misplaced",
  82         [0xa1] = "Volume inaccessible",
  83         [0xa2] = "Volume in input",
  84         [0xa3] = "Volume ejected",
  85         [0xa4] = "All categories reserved",
  86         [0xa5] = "Duplicate Volume",
  87         [0xa6] = "Library Manager Offline",
  88         [0xa7] = "Library Output Station full",
  89         [0xa8] = "Vision System non-operational",
  90         [0xa9] = "Library Manager Equipment Check",
  91         [0xaa] = "Library Equipment Check",
  92         [0xab] = "All Library Cells full",
  93         [0xac] = "No Cleaner Volumes in Library",
  94         [0xad] = "I/O Station door open",
  95         [0xae] = "Subsystem environmental alert",
  96 };
  97
  98 static int crypt_supported(struct tape_device *device)
  99 {
 100         return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device));
 101 }
 102
 103 static int crypt_enabled(struct tape_device *device)
 104 {
 105         return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device));
 106 }
 107
 108 static void ext_to_int_kekl(struct tape390_kekl *in,
 109                             struct tape3592_kekl *out)
 110 {
 111         int i;
 112
 113         memset(out, 0, sizeof(*out));
 114         if (in->type == TAPE390_KEKL_TYPE_HASH)
 115                 out->flags |= 0x40;
 116         if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH)
 117                 out->flags |= 0x80;
 118         strncpy(out->label, in->label, 64);
 119         for (i = strlen(in->label); i < sizeof(out->label); i++)
 120                 out->label[i] = ' ';
 121         ASCEBC(out->label, sizeof(out->label));
 122 }
 123
 124 static void int_to_ext_kekl(struct tape3592_kekl *in,
 125                             struct tape390_kekl *out)
 126 {
 127         memset(out, 0, sizeof(*out));
 128         if(in->flags & 0x40)
 129                 out->type = TAPE390_KEKL_TYPE_HASH;
 130         else
 131                 out->type = TAPE390_KEKL_TYPE_LABEL;
 132         if(in->flags & 0x80)
 133                 out->type_on_tape = TAPE390_KEKL_TYPE_HASH;
 134         else
 135                 out->type_on_tape = TAPE390_KEKL_TYPE_LABEL;
 136         memcpy(out->label, in->label, sizeof(in->label));
 137         EBCASC(out->label, sizeof(in->label));
 138         strstrip(out->label);
 139 }
 140
 141 static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in,
 142                                  struct tape390_kekl_pair *out)
 143 {
 144         if (in->count == 0) {
 145                 out->kekl[0].type = TAPE390_KEKL_TYPE_NONE;
 146                 out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 147                 out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
 148                 out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 149         } else if (in->count == 1) {
 150                 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
 151                 out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
 152                 out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 153         } else if (in->count == 2) {
 154                 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
 155                 int_to_ext_kekl(&in->kekl[1], &out->kekl[1]);
 156         } else {
 157                 printk("Invalid KEKL number: %d\n", in->count);
 158                 BUG();
 159         }
 160 }
 161
 162 static int check_ext_kekl(struct tape390_kekl *kekl)
 163 {
 164         if (kekl->type == TAPE390_KEKL_TYPE_NONE)
 165                 goto invalid;
 166         if (kekl->type > TAPE390_KEKL_TYPE_HASH)
 167                 goto invalid;
 168         if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE)
 169                 goto invalid;
 170         if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH)
 171                 goto invalid;
 172         if ((kekl->type == TAPE390_KEKL_TYPE_HASH) &&
 173             (kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL))
 174                 goto invalid;
 175
 176         return 0;
 177 invalid:
 178         return -EINVAL;
 179 }
 180
 181 static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls)
 182 {
 183         if (check_ext_kekl(&kekls->kekl[0]))
 184                 goto invalid;
 185         if (check_ext_kekl(&kekls->kekl[1]))
 186                 goto invalid;
 187
 188         return 0;
 189 invalid:
 190         return -EINVAL;
 191 }
 192
 193 /*
 194  * Query KEKLs
 195  */
 196 static int tape_3592_kekl_query(struct tape_device *device,
 197                                 struct tape390_kekl_pair *ext_kekls)
 198 {
 199         struct tape_request *request;
 200         struct tape3592_kekl_query_order *order;
 201         struct tape3592_kekl_query_data *int_kekls;
 202         int rc;
 203
 204         DBF_EVENT(6, "tape3592_kekl_query\n");
 205         int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA);
 206         if (!int_kekls)
 207                 return -ENOMEM;
 208         request = tape_alloc_request(2, sizeof(*order));
 209         if (IS_ERR(request)) {
 210                 rc = PTR_ERR(request);
 211                 goto fail_malloc;
 212         }
 213         order = request->cpdata;
 214         memset(order,0,sizeof(*order));
 215         order->code = 0xe2;
 216         order->max_count = 2;
 217         request->op = TO_KEKL_QUERY;
 218         tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
 219         tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls),
 220                      int_kekls);
 221         rc = tape_do_io(device, request);
 222         if (rc)
 223                 goto fail_request;
 224         int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls);
 225
 226         rc = 0;
 227 fail_request:
 228         tape_free_request(request);
 229 fail_malloc:
 230         kfree(int_kekls);
 231         return rc;
 232 }
 233
 234 /*
 235  * IOCTL: Query KEKLs
 236  */
 237 static int tape_3592_ioctl_kekl_query(struct tape_device *device,
 238                                       unsigned long arg)
 239 {
 240         int rc;
 241         struct tape390_kekl_pair *ext_kekls;
 242
 243         DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n");
 244         if (!crypt_supported(device))
 245                 return -ENOSYS;
 246         if (!crypt_enabled(device))
 247                 return -EUNATCH;
 248         ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
 249         if (!ext_kekls)
 250                 return -ENOMEM;
 251         rc = tape_3592_kekl_query(device, ext_kekls);
 252         if (rc != 0)
 253                 goto fail;
 254         if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) {
 255                 rc = -EFAULT;
 256                 goto fail;
 257         }
 258         rc = 0;
 259 fail:
 260         kfree(ext_kekls);
 261         return rc;
 262 }
 263
 264 static int tape_3590_mttell(struct tape_device *device, int mt_count);
 265
 266 /*
 267  * Set KEKLs
 268  */
 269 static int tape_3592_kekl_set(struct tape_device *device,
 270                               struct tape390_kekl_pair *ext_kekls)
 271 {
 272         struct tape_request *request;
 273         struct tape3592_kekl_set_order *order;
 274
 275         DBF_EVENT(6, "tape3592_kekl_set\n");
 276         if (check_ext_kekl_pair(ext_kekls)) {
 277                 DBF_EVENT(6, "invalid kekls\n");
 278                 return -EINVAL;
 279         }
 280         if (tape_3590_mttell(device, 0) != 0)
 281                 return -EBADSLT;
 282         request = tape_alloc_request(1, sizeof(*order));
 283         if (IS_ERR(request))
 284                 return PTR_ERR(request);
 285         order = request->cpdata;
 286         memset(order, 0, sizeof(*order));
 287         order->code = 0xe3;
 288         order->kekls.count = 2;
 289         ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]);
 290         ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]);
 291         request->op = TO_KEKL_SET;
 292         tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
 293
 294         return tape_do_io_free(device, request);
 295 }
 296
 297 /*
 298  * IOCTL: Set KEKLs
 299  */
 300 static int tape_3592_ioctl_kekl_set(struct tape_device *device,
 301                                     unsigned long arg)
 302 {
 303         int rc;
 304         struct tape390_kekl_pair *ext_kekls;
 305
 306         DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n");
 307         if (!crypt_supported(device))
 308                 return -ENOSYS;
 309         if (!crypt_enabled(device))
 310                 return -EUNATCH;
 311         ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
 312         if (!ext_kekls)
 313                 return -ENOMEM;
 314         if (copy_from_user(ext_kekls, (char __user *)arg, sizeof(*ext_kekls))) {
 315                 rc = -EFAULT;
 316                 goto out;
 317         }
 318         rc = tape_3592_kekl_set(device, ext_kekls);
 319 out:
 320         kfree(ext_kekls);
 321         return rc;
 322 }
 323
 324 /*
 325  * Enable encryption
 326  */
 327 static int tape_3592_enable_crypt(struct tape_device *device)
 328 {
 329         struct tape_request *request;
 330         char *data;
 331
 332         DBF_EVENT(6, "tape_3592_enable_crypt\n");
 333         if (!crypt_supported(device))
 334                 return -ENOSYS;
 335         request = tape_alloc_request(2, 72);
 336         if (IS_ERR(request))
 337                 return PTR_ERR(request);
 338         data = request->cpdata;
 339         memset(data,0,72);
 340
 341         data[0]       = 0x05;
 342         data[36 + 0]  = 0x03;
 343         data[36 + 1]  = 0x03;
 344         data[36 + 4]  = 0x40;
 345         data[36 + 6]  = 0x01;
 346         data[36 + 14] = 0x2f;
 347         data[36 + 18] = 0xc3;
 348         data[36 + 35] = 0x72;
 349         request->op = TO_CRYPT_ON;
 350         tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
 351         tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
 352         return tape_do_io_free(device, request);
 353 }
 354
 355 /*
 356  * Disable encryption
 357  */
 358 static int tape_3592_disable_crypt(struct tape_device *device)
 359 {
 360         struct tape_request *request;
 361         char *data;
 362
 363         DBF_EVENT(6, "tape_3592_disable_crypt\n");
 364         if (!crypt_supported(device))
 365                 return -ENOSYS;
 366         request = tape_alloc_request(2, 72);
 367         if (IS_ERR(request))
 368                 return PTR_ERR(request);
 369         data = request->cpdata;
 370         memset(data,0,72);
 371
 372         data[0]       = 0x05;
 373         data[36 + 0]  = 0x03;
 374         data[36 + 1]  = 0x03;
 375         data[36 + 35] = 0x32;
 376
 377         request->op = TO_CRYPT_OFF;
 378         tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
 379         tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
 380
 381         return tape_do_io_free(device, request);
 382 }
 383
 384 /*
 385  * IOCTL: Set encryption status
 386  */
 387 static int tape_3592_ioctl_crypt_set(struct tape_device *device,
 388                                      unsigned long arg)
 389 {
 390         struct tape390_crypt_info info;
 391
 392         DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n");
 393         if (!crypt_supported(device))
 394                 return -ENOSYS;
 395         if (copy_from_user(&info, (char __user *)arg, sizeof(info)))
 396                 return -EFAULT;
 397         if (info.status & ~TAPE390_CRYPT_ON_MASK)
 398                 return -EINVAL;
 399         if (info.status & TAPE390_CRYPT_ON_MASK)
 400                 return tape_3592_enable_crypt(device);
 401         else
 402                 return tape_3592_disable_crypt(device);
 403 }
 404
 405 static int tape_3590_sense_medium(struct tape_device *device);
 406
 407 /*
 408  * IOCTL: Query enryption status
 409  */
 410 static int tape_3592_ioctl_crypt_query(struct tape_device *device,
 411                                        unsigned long arg)
 412 {
 413         DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n");
 414         if (!crypt_supported(device))
 415                 return -ENOSYS;
 416         tape_3590_sense_medium(device);
 417         if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device),
 418                 sizeof(TAPE_3590_CRYPT_INFO(device))))
 419                 return -EFAULT;
 420         else
 421                 return 0;
 422 }
 423
 424 /*
 425  * 3590 IOCTL Overload
 426  */
 427 static int
 428 tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
 429 {
 430         switch (cmd) {
 431         case TAPE390_DISPLAY: {
 432                 struct display_struct disp;
 433
 434                 if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)))
 435                         return -EFAULT;
 436
 437                 return tape_std_display(device, &disp);
 438         }
 439         case TAPE390_KEKL_SET:
 440                 return tape_3592_ioctl_kekl_set(device, arg);
 441         case TAPE390_KEKL_QUERY:
 442                 return tape_3592_ioctl_kekl_query(device, arg);
 443         case TAPE390_CRYPT_SET:
 444                 return tape_3592_ioctl_crypt_set(device, arg);
 445         case TAPE390_CRYPT_QUERY:
 446                 return tape_3592_ioctl_crypt_query(device, arg);
 447         default:
 448                 return -EINVAL; /* no additional ioctls */
 449         }
 450 }
 451
 452 /*
 453  * SENSE Medium: Get Sense data about medium state
 454  */
 455 static int
 456 tape_3590_sense_medium(struct tape_device *device)
 457 {
 458         struct tape_request *request;
 459
 460         request = tape_alloc_request(1, 128);
 461         if (IS_ERR(request))
 462                 return PTR_ERR(request);
 463         request->op = TO_MSEN;
 464         tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
 465         return tape_do_io_free(device, request);
 466 }
 467
 468 /*
 469  * MTTELL: Tell block. Return the number of block relative to current file.
 470  */
 471 static int
 472 tape_3590_mttell(struct tape_device *device, int mt_count)
 473 {
 474         __u64 block_id;
 475         int rc;
 476
 477         rc = tape_std_read_block_id(device, &block_id);
 478         if (rc)
 479                 return rc;
 480         return block_id >> 32;
 481 }
 482
 483 /*
 484  * MTSEEK: seek to the specified block.
 485  */
 486 static int
 487 tape_3590_mtseek(struct tape_device *device, int count)
 488 {
 489         struct tape_request *request;
 490
 491         DBF_EVENT(6, "xsee id: %x\n", count);
 492         request = tape_alloc_request(3, 4);
 493         if (IS_ERR(request))
 494                 return PTR_ERR(request);
 495         request->op = TO_LBL;
 496         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
 497         *(__u32 *) request->cpdata = count;
 498         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
 499         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
 500         return tape_do_io_free(device, request);
 501 }
 502
 503 /*
 504  * Read Opposite Error Recovery Function:
 505  * Used, when Read Forward does not work
 506  */
 507 static void
 508 tape_3590_read_opposite(struct tape_device *device,
 509                         struct tape_request *request)
 510 {
 511         struct tape_3590_disc_data *data;
 512
 513         /*
 514          * We have allocated 4 ccws in tape_std_read, so we can now
 515          * transform the request to a read backward, followed by a
 516          * forward space block.
 517          */
 518         request->op = TO_RBA;
 519         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
 520         data = device->discdata;
 521         tape_ccw_cc_idal(request->cpaddr + 1, data->read_back_op,
 522                          device->char_data.idal_buf);
 523         tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL);
 524         tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL);
 525         DBF_EVENT(6, "xrop ccwg\n");
 526 }
 527
 528 /*
 529  * Read Attention Msg
 530  * This should be done after an interrupt with attention bit (0x80)
 531  * in device state.
 532  *
 533  * After a "read attention message" request there are two possible
 534  * results:
 535  *
 536  * 1. A unit check is presented, when attention sense is present (e.g. when
 537  * a medium has been unloaded). The attention sense comes then
 538  * together with the unit check. The recovery action is either "retry"
 539  * (in case there is an attention message pending) or "permanent error".
 540  *
 541  * 2. The attention msg is written to the "read subsystem data" buffer.
 542  * In this case we probably should print it to the console.
 543  */
 544 static int
 545 tape_3590_read_attmsg(struct tape_device *device)
 546 {
 547         struct tape_request *request;
 548         char *buf;
 549
 550         request = tape_alloc_request(3, 4096);
 551         if (IS_ERR(request))
 552                 return PTR_ERR(request);
 553         request->op = TO_READ_ATTMSG;
 554         buf = request->cpdata;
 555         buf[0] = PREP_RD_SS_DATA;
 556         buf[6] = RD_ATTMSG;     /* read att msg */
 557         tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf);
 558         tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12);
 559         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
 560         return tape_do_io_free(device, request);
 561 }
 562
 563 /*
 564  * These functions are used to schedule follow-up actions from within an
 565  * interrupt context (like unsolicited interrupts).
 566  */
 567 struct work_handler_data {
 568         struct tape_device *device;
 569         enum tape_op        op;
 570         struct work_struct  work;
 571 };
 572
 573 static void
 574 tape_3590_work_handler(struct work_struct *work)
 575 {
 576         struct work_handler_data *p =
 577                 container_of(work, struct work_handler_data, work);
 578
 579         switch (p->op) {
 580         case TO_MSEN:
 581                 tape_3590_sense_medium(p->device);
 582                 break;
 583         case TO_READ_ATTMSG:
 584                 tape_3590_read_attmsg(p->device);
 585                 break;
 586         case TO_CRYPT_ON:
 587                 tape_3592_enable_crypt(p->device);
 588                 break;
 589         case TO_CRYPT_OFF:
 590                 tape_3592_disable_crypt(p->device);
 591                 break;
 592         default:
 593                 DBF_EVENT(3, "T3590: work handler undefined for "
 594                           "operation 0x%02x\n", p->op);
 595         }
 596         tape_put_device(p->device);
 597         kfree(p);
 598 }
 599
 600 static int
 601 tape_3590_schedule_work(struct tape_device *device, enum tape_op op)
 602 {
 603         struct work_handler_data *p;
 604
 605         if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
 606                 return -ENOMEM;
 607
 608         INIT_WORK(&p->work, tape_3590_work_handler);
 609
 610         p->device = tape_get_device_reference(device);
 611         p->op = op;
 612
 613         schedule_work(&p->work);
 614         return 0;
 615 }
 616
 617 #ifdef CONFIG_S390_TAPE_BLOCK
 618 /*
 619  * Tape Block READ
 620  */
 621 static struct tape_request *
 622 tape_3590_bread(struct tape_device *device, struct request *req)
 623 {
 624         struct tape_request *request;
 625         struct ccw1 *ccw;
 626         int count = 0, start_block;
 627         unsigned off;
 628         char *dst;
 629         struct bio_vec *bv;
 630         struct req_iterator iter;
 631
 632         DBF_EVENT(6, "xBREDid:");
 633         start_block = req->sector >> TAPEBLOCK_HSEC_S2B;
 634         DBF_EVENT(6, "start_block = %i\n", start_block);
 635
 636         rq_for_each_segment(bv, req, iter)
 637                 count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
 638
 639         request = tape_alloc_request(2 + count + 1, 4);
 640         if (IS_ERR(request))
 641                 return request;
 642         request->op = TO_BLOCK;
 643         *(__u32 *) request->cpdata = start_block;
 644         ccw = request->cpaddr;
 645         ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte);
 646
 647         /*
 648          * We always setup a nop after the mode set ccw. This slot is
 649          * used in tape_std_check_locate to insert a locate ccw if the
 650          * current tape position doesn't match the start block to be read.
 651          */
 652         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
 653
 654         rq_for_each_segment(bv, req, iter) {
 655                 dst = page_address(bv->bv_page) + bv->bv_offset;
 656                 for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) {
 657                         ccw->flags = CCW_FLAG_CC;
 658                         ccw->cmd_code = READ_FORWARD;
 659                         ccw->count = TAPEBLOCK_HSEC_SIZE;
 660                         set_normalized_cda(ccw, (void *) __pa(dst));
 661                         ccw++;
 662                         dst += TAPEBLOCK_HSEC_SIZE;
 663                 }
 664                 if (off > bv->bv_len)
 665                         BUG();
 666         }
 667         ccw = tape_ccw_end(ccw, NOP, 0, NULL);
 668         DBF_EVENT(6, "xBREDccwg\n");
 669         return request;
 670 }
 671
 672 static void
 673 tape_3590_free_bread(struct tape_request *request)
 674 {
 675         struct ccw1 *ccw;
 676
 677         /* Last ccw is a nop and doesn't need clear_normalized_cda */
 678         for (ccw = request->cpaddr; ccw->flags & CCW_FLAG_CC; ccw++)
 679                 if (ccw->cmd_code == READ_FORWARD)
 680                         clear_normalized_cda(ccw);
 681         tape_free_request(request);
 682 }
 683
 684 /*
 685  * check_locate is called just before the tape request is passed to
 686  * the common io layer for execution. It has to check the current
 687  * tape position and insert a locate ccw if it doesn't match the
 688  * start block for the request.
 689  */
 690 static void
 691 tape_3590_check_locate(struct tape_device *device, struct tape_request *request)
 692 {
 693         __u32 *start_block;
 694
 695         start_block = (__u32 *) request->cpdata;
 696         if (*start_block != device->blk_data.block_position) {
 697                 /* Add the start offset of the file to get the real block. */
 698                 *start_block += device->bof;
 699                 tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
 700         }
 701 }
 702 #endif
 703
 704 static void tape_3590_med_state_set(struct tape_device *device,
 705                                     struct tape_3590_med_sense *sense)
 706 {
 707         struct tape390_crypt_info *c_info;
 708
 709         c_info = &TAPE_3590_CRYPT_INFO(device);
 710
 711         DBF_EVENT(6, "medium state: %x:%x\n", sense->macst, sense->masst);
 712         switch (sense->macst) {
 713         case 0x04:
 714         case 0x05:
 715         case 0x06:
 716                 tape_med_state_set(device, MS_UNLOADED);
 717                 TAPE_3590_CRYPT_INFO(device).medium_status = 0;
 718                 return;
 719         case 0x08:
 720         case 0x09:
 721                 tape_med_state_set(device, MS_LOADED);
 722                 break;
 723         default:
 724                 tape_med_state_set(device, MS_UNKNOWN);
 725                 return;
 726         }
 727         c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
 728         if (sense->flags & MSENSE_CRYPT_MASK) {
 729                 PRINT_INFO("Medium is encrypted (%04x)\n", sense->flags);
 730                 c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
 731         } else  {
 732                 DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
 733                 c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
 734         }
 735 }
 736
 737 /*
 738  * The done handler is called at device/channel end and wakes up the sleeping
 739  * process
 740  */
 741 static int
 742 tape_3590_done(struct tape_device *device, struct tape_request *request)
 743 {
 744         struct tape_3590_disc_data *disc_data;
 745
 746         DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
 747         disc_data = device->discdata;
 748
 749         switch (request->op) {
 750         case TO_BSB:
 751         case TO_BSF:
 752         case TO_DSE:
 753         case TO_FSB:
 754         case TO_FSF:
 755         case TO_LBL:
 756         case TO_RFO:
 757         case TO_RBA:
 758         case TO_REW:
 759         case TO_WRI:
 760         case TO_WTM:
 761         case TO_BLOCK:
 762         case TO_LOAD:
 763                 tape_med_state_set(device, MS_LOADED);
 764                 break;
 765         case TO_RUN:
 766                 tape_med_state_set(device, MS_UNLOADED);
 767                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
 768                 break;
 769         case TO_MSEN:
 770                 tape_3590_med_state_set(device, request->cpdata);
 771                 break;
 772         case TO_CRYPT_ON:
 773                 TAPE_3590_CRYPT_INFO(device).status
 774                         |= TAPE390_CRYPT_ON_MASK;
 775                 *(device->modeset_byte) |= 0x03;
 776                 break;
 777         case TO_CRYPT_OFF:
 778                 TAPE_3590_CRYPT_INFO(device).status
 779                         &= ~TAPE390_CRYPT_ON_MASK;
 780                 *(device->modeset_byte) &= ~0x03;
 781                 break;
 782         case TO_RBI:    /* RBI seems to succeed even without medium loaded. */
 783         case TO_NOP:    /* Same to NOP. */
 784         case TO_READ_CONFIG:
 785         case TO_READ_ATTMSG:
 786         case TO_DIS:
 787         case TO_ASSIGN:
 788         case TO_UNASSIGN:
 789         case TO_SIZE:
 790         case TO_KEKL_SET:
 791         case TO_KEKL_QUERY:
 792         case TO_RDC:
 793                 break;
 794         }
 795         return TAPE_IO_SUCCESS;
 796 }
 797
 798 /*
 799  * This fuction is called, when error recovery was successfull
 800  */
 801 static inline int
 802 tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request)
 803 {
 804         DBF_EVENT(3, "Error Recovery successfull for %s\n",
 805                   tape_op_verbose[request->op]);
 806         return tape_3590_done(device, request);
 807 }
 808
 809 /*
 810  * This fuction is called, when error recovery was not successfull
 811  */
 812 static inline int
 813 tape_3590_erp_failed(struct tape_device *device, struct tape_request *request,
 814                      struct irb *irb, int rc)
 815 {
 816         DBF_EVENT(3, "Error Recovery failed for %s\n",
 817                   tape_op_verbose[request->op]);
 818         tape_dump_sense_dbf(device, request, irb);
 819         return rc;
 820 }
 821
 822 /*
 823  * Error Recovery do retry
 824  */
 825 static inline int
 826 tape_3590_erp_retry(struct tape_device *device, struct tape_request *request,
 827                     struct irb *irb)
 828 {
 829         DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]);
 830         tape_dump_sense_dbf(device, request, irb);
 831         return TAPE_IO_RETRY;
 832 }
 833
 834 /*
 835  * Handle unsolicited interrupts
 836  */
 837 static int
 838 tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb)
 839 {
 840         if (irb->scsw.dstat == DEV_STAT_CHN_END)
 841                 /* Probably result of halt ssch */
 842                 return TAPE_IO_PENDING;
 843         else if (irb->scsw.dstat == 0x85)
 844                 /* Device Ready */
 845                 DBF_EVENT(3, "unsol.irq! tape ready: %08x\n", device->cdev_id);
 846         else if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
 847                 tape_3590_schedule_work(device, TO_READ_ATTMSG);
 848         } else {
 849                 DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
 850                 PRINT_WARN("Unsolicited IRQ (Device End) caught.\n");
 851                 tape_dump_sense(device, NULL, irb);
 852         }
 853         /* check medium state */
 854         tape_3590_schedule_work(device, TO_MSEN);
 855         return TAPE_IO_SUCCESS;
 856 }
 857
 858 /*
 859  * Basic Recovery routine
 860  */
 861 static int
 862 tape_3590_erp_basic(struct tape_device *device, struct tape_request *request,
 863                     struct irb *irb, int rc)
 864 {
 865         struct tape_3590_sense *sense;
 866
 867         sense = (struct tape_3590_sense *) irb->ecw;
 868
 869         switch (sense->bra) {
 870         case SENSE_BRA_PER:
 871                 return tape_3590_erp_failed(device, request, irb, rc);
 872         case SENSE_BRA_CONT:
 873                 return tape_3590_erp_succeded(device, request);
 874         case SENSE_BRA_RE:
 875                 return tape_3590_erp_retry(device, request, irb);
 876         case SENSE_BRA_DRE:
 877                 return tape_3590_erp_failed(device, request, irb, rc);
 878         default:
 879                 PRINT_ERR("Unknown BRA %x - This should not happen!\n",
 880                           sense->bra);
 881                 BUG();
 882                 return TAPE_IO_STOP;
 883         }
 884 }
 885
 886 /*
 887  *  RDL: Read Device (buffered) log
 888  */
 889 static int
 890 tape_3590_erp_read_buf_log(struct tape_device *device,
 891                            struct tape_request *request, struct irb *irb)
 892 {
 893         /*
 894          * We just do the basic error recovery at the moment (retry).
 895          * Perhaps in the future, we read the log and dump it somewhere...
 896          */
 897         return tape_3590_erp_basic(device, request, irb, -EIO);
 898 }
 899
 900 /*
 901  *  SWAP: Swap Devices
 902  */
 903 static int
 904 tape_3590_erp_swap(struct tape_device *device, struct tape_request *request,
 905                    struct irb *irb)
 906 {
 907         /*
 908          * This error recovery should swap the tapes
 909          * if the original has a problem. The operation
 910          * should proceed with the new tape... this
 911          * should probably be done in user space!
 912          */
 913         PRINT_WARN("(%s): Swap Tape Device!\n", device->cdev->dev.bus_id);
 914         return tape_3590_erp_basic(device, request, irb, -EIO);
 915 }
 916
 917 /*
 918  *  LBY: Long Busy
 919  */
 920 static int
 921 tape_3590_erp_long_busy(struct tape_device *device,
 922                         struct tape_request *request, struct irb *irb)
 923 {
 924         DBF_EVENT(6, "Device is busy\n");
 925         return TAPE_IO_LONG_BUSY;
 926 }
 927
 928 /*
 929  *  SPI: Special Intercept
 930  */
 931 static int
 932 tape_3590_erp_special_interrupt(struct tape_device *device,
 933                                 struct tape_request *request, struct irb *irb)
 934 {
 935         return tape_3590_erp_basic(device, request, irb, -EIO);
 936 }
 937
 938 /*
 939  *  RDA: Read Alternate
 940  */
 941 static int
 942 tape_3590_erp_read_alternate(struct tape_device *device,
 943                              struct tape_request *request, struct irb *irb)
 944 {
 945         struct tape_3590_disc_data *data;
 946
 947         /*
 948          * The issued Read Backward or Read Previous command is not
 949          * supported by the device
 950          * The recovery action should be to issue another command:
 951          * Read Revious: if Read Backward is not supported
 952          * Read Backward: if Read Previous is not supported
 953          */
 954         data = device->discdata;
 955         if (data->read_back_op == READ_PREVIOUS) {
 956                 DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n",
 957                           device->cdev_id);
 958                 data->read_back_op = READ_BACKWARD;
 959         } else {
 960                 DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n",
 961                           device->cdev_id);
 962                 data->read_back_op = READ_PREVIOUS;
 963         }
 964         tape_3590_read_opposite(device, request);
 965         return tape_3590_erp_retry(device, request, irb);
 966 }
 967
 968 /*
 969  * Error Recovery read opposite
 970  */
 971 static int
 972 tape_3590_erp_read_opposite(struct tape_device *device,
 973                             struct tape_request *request, struct irb *irb)
 974 {
 975         switch (request->op) {
 976         case TO_RFO:
 977                 /*
 978                  * We did read forward, but the data could not be read.
 979                  * We will read backward and then skip forward again.
 980                  */
 981                 tape_3590_read_opposite(device, request);
 982                 return tape_3590_erp_retry(device, request, irb);
 983         case TO_RBA:
 984                 /* We tried to read forward and backward, but hat no success */
 985                 return tape_3590_erp_failed(device, request, irb, -EIO);
 986                 break;
 987         default:
 988                 PRINT_WARN("read_opposite_recovery_called_with_op: %s\n",
 989                            tape_op_verbose[request->op]);
 990                 return tape_3590_erp_failed(device, request, irb, -EIO);
 991         }
 992 }
 993
 994 /*
 995  * Print an MIM (Media Information  Message) (message code f0)
 996  */
 997 static void
 998 tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb)
 999 {
1000         struct tape_3590_sense *sense;
1001
1002         sense = (struct tape_3590_sense *) irb->ecw;
1003         /* Exception Message */
1004         switch (sense->fmt.f70.emc) {
1005         case 0x02:
1006                 PRINT_WARN("(%s): Data degraded\n", device->cdev->dev.bus_id);
1007                 break;
1008         case 0x03:
1009                 PRINT_WARN("(%s): Data degraded in partion %i\n",
1010                            device->cdev->dev.bus_id, sense->fmt.f70.mp);
1011                 break;
1012         case 0x04:
1013                 PRINT_WARN("(%s): Medium degraded\n", device->cdev->dev.bus_id);
1014                 break;
1015         case 0x05:
1016                 PRINT_WARN("(%s): Medium degraded in partition %i\n",
1017                            device->cdev->dev.bus_id, sense->fmt.f70.mp);
1018                 break;
1019         case 0x06:
1020                 PRINT_WARN("(%s): Block 0 Error\n", device->cdev->dev.bus_id);
1021                 break;
1022         case 0x07:
1023                 PRINT_WARN("(%s): Medium Exception 0x%02x\n",
1024                            device->cdev->dev.bus_id, sense->fmt.f70.md);
1025                 break;
1026         default:
1027                 PRINT_WARN("(%s): MIM ExMsg: 0x%02x\n",
1028                            device->cdev->dev.bus_id, sense->fmt.f70.emc);
1029                 break;
1030         }
1031         /* Service Message */
1032         switch (sense->fmt.f70.smc) {
1033         case 0x02:
1034                 PRINT_WARN("(%s): Reference Media maintenance procedure %i\n",
1035                            device->cdev->dev.bus_id, sense->fmt.f70.md);
1036                 break;
1037         default:
1038                 PRINT_WARN("(%s): MIM ServiceMsg: 0x%02x\n",
1039                            device->cdev->dev.bus_id, sense->fmt.f70.smc);
1040                 break;
1041         }
1042 }
1043
1044 /*
1045  * Print an I/O Subsystem Service Information Message (message code f1)
1046  */
1047 static void
1048 tape_3590_print_io_sim_msg_f1(struct tape_device *device, struct irb *irb)
1049 {
1050         struct tape_3590_sense *sense;
1051
1052         sense = (struct tape_3590_sense *) irb->ecw;
1053         /* Exception Message */
1054         switch (sense->fmt.f71.emc) {
1055         case 0x01:
1056                 PRINT_WARN("(%s): Effect of failure is unknown\n",
1057                            device->cdev->dev.bus_id);
1058                 break;
1059         case 0x02:
1060                 PRINT_WARN("(%s): CU Exception - no performance impact\n",
1061                            device->cdev->dev.bus_id);
1062                 break;
1063         case 0x03:
1064                 PRINT_WARN("(%s): CU Exception on channel interface 0x%02x\n",
1065                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1066                 break;
1067         case 0x04:
1068                 PRINT_WARN("(%s): CU Exception on device path 0x%02x\n",
1069                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1070                 break;
1071         case 0x05:
1072                 PRINT_WARN("(%s): CU Exception on library path 0x%02x\n",
1073                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1074                 break;
1075         case 0x06:
1076                 PRINT_WARN("(%s): CU Exception on node 0x%02x\n",
1077                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1078                 break;
1079         case 0x07:
1080                 PRINT_WARN("(%s): CU Exception on partition 0x%02x\n",
1081                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1082                 break;
1083         default:
1084                 PRINT_WARN("(%s): SIM ExMsg: 0x%02x\n",
1085                            device->cdev->dev.bus_id, sense->fmt.f71.emc);
1086         }
1087         /* Service Message */
1088         switch (sense->fmt.f71.smc) {
1089         case 0x01:
1090                 PRINT_WARN("(%s): Repair impact is unknown\n",
1091                            device->cdev->dev.bus_id);
1092                 break;
1093         case 0x02:
1094                 PRINT_WARN("(%s): Repair will not impact cu performance\n",
1095                            device->cdev->dev.bus_id);
1096                 break;
1097         case 0x03:
1098                 if (sense->fmt.f71.mdf == 0)
1099                         PRINT_WARN("(%s): Repair will disable node "
1100                                    "0x%x on CU\n",
1101                                    device->cdev->dev.bus_id,
1102                                    sense->fmt.f71.md[1]);
1103                 else
1104                         PRINT_WARN("(%s): Repair will disable nodes "
1105                                    "(0x%x-0x%x) on CU\n",
1106                                    device->cdev->dev.bus_id,
1107                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1108                 break;
1109         case 0x04:
1110                 if (sense->fmt.f71.mdf == 0)
1111                         PRINT_WARN("(%s): Repair will disable cannel path "
1112                                    "0x%x on CU\n",
1113                                    device->cdev->dev.bus_id,
1114                                    sense->fmt.f71.md[1]);
1115                 else
1116                         PRINT_WARN("(%s): Repair will disable cannel paths "
1117                                    "(0x%x-0x%x) on CU\n",
1118                                    device->cdev->dev.bus_id,
1119                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1120                 break;
1121         case 0x05:
1122                 if (sense->fmt.f71.mdf == 0)
1123                         PRINT_WARN("(%s): Repair will disable device path "
1124                                    "0x%x on CU\n",
1125                                    device->cdev->dev.bus_id,
1126                                    sense->fmt.f71.md[1]);
1127                 else
1128                         PRINT_WARN("(%s): Repair will disable device paths "
1129                                    "(0x%x-0x%x) on CU\n",
1130                                    device->cdev->dev.bus_id,
1131                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1132                 break;
1133         case 0x06:
1134                 if (sense->fmt.f71.mdf == 0)
1135                         PRINT_WARN("(%s): Repair will disable library path "
1136                                    "0x%x on CU\n",
1137                                    device->cdev->dev.bus_id,
1138                                    sense->fmt.f71.md[1]);
1139                 else
1140                         PRINT_WARN("(%s): Repair will disable library paths "
1141                                    "(0x%x-0x%x) on CU\n",
1142                                    device->cdev->dev.bus_id,
1143                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1144                 break;
1145         case 0x07:
1146                 PRINT_WARN("(%s): Repair will disable access to CU\n",
1147                            device->cdev->dev.bus_id);
1148                 break;
1149         default:
1150                 PRINT_WARN("(%s): SIM ServiceMsg: 0x%02x\n",
1151                            device->cdev->dev.bus_id, sense->fmt.f71.smc);
1152         }
1153 }
1154
1155 /*
1156  * Print an Device Subsystem Service Information Message (message code f2)
1157  */
1158 static void
1159 tape_3590_print_dev_sim_msg_f2(struct tape_device *device, struct irb *irb)
1160 {
1161         struct tape_3590_sense *sense;
1162
1163         sense = (struct tape_3590_sense *) irb->ecw;
1164         /* Exception Message */
1165         switch (sense->fmt.f71.emc) {
1166         case 0x01:
1167                 PRINT_WARN("(%s): Effect of failure is unknown\n",
1168                            device->cdev->dev.bus_id);
1169                 break;
1170         case 0x02:
1171                 PRINT_WARN("(%s): DV Exception - no performance impact\n",
1172                            device->cdev->dev.bus_id);
1173                 break;
1174         case 0x03:
1175                 PRINT_WARN("(%s): DV Exception on channel interface 0x%02x\n",
1176                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1177                 break;
1178         case 0x04:
1179                 PRINT_WARN("(%s): DV Exception on loader 0x%02x\n",
1180                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1181                 break;
1182         case 0x05:
1183                 PRINT_WARN("(%s): DV Exception on message display 0x%02x\n",
1184                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1185                 break;
1186         case 0x06:
1187                 PRINT_WARN("(%s): DV Exception in tape path\n",
1188                            device->cdev->dev.bus_id);
1189                 break;
1190         case 0x07:
1191                 PRINT_WARN("(%s): DV Exception in drive\n",
1192                            device->cdev->dev.bus_id);
1193                 break;
1194         default:
1195                 PRINT_WARN("(%s): DSIM ExMsg: 0x%02x\n",
1196                            device->cdev->dev.bus_id, sense->fmt.f71.emc);
1197         }
1198         /* Service Message */
1199         switch (sense->fmt.f71.smc) {
1200         case 0x01:
1201                 PRINT_WARN("(%s): Repair impact is unknown\n",
1202                            device->cdev->dev.bus_id);
1203                 break;
1204         case 0x02:
1205                 PRINT_WARN("(%s): Repair will not impact device performance\n",
1206                            device->cdev->dev.bus_id);
1207                 break;
1208         case 0x03:
1209                 if (sense->fmt.f71.mdf == 0)
1210                         PRINT_WARN("(%s): Repair will disable channel path "
1211                                    "0x%x on DV\n",
1212                                    device->cdev->dev.bus_id,
1213                                    sense->fmt.f71.md[1]);
1214                 else
1215                         PRINT_WARN("(%s): Repair will disable channel path "
1216                                    "(0x%x-0x%x) on DV\n",
1217                                    device->cdev->dev.bus_id,
1218                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1219                 break;
1220         case 0x04:
1221                 if (sense->fmt.f71.mdf == 0)
1222                         PRINT_WARN("(%s): Repair will disable interface 0x%x "
1223                                    "on DV\n",
1224                                    device->cdev->dev.bus_id,
1225                                    sense->fmt.f71.md[1]);
1226                 else
1227                         PRINT_WARN("(%s): Repair will disable interfaces "
1228                                    "(0x%x-0x%x) on DV\n",
1229                                    device->cdev->dev.bus_id,
1230                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1231                 break;
1232         case 0x05:
1233                 if (sense->fmt.f71.mdf == 0)
1234                         PRINT_WARN("(%s): Repair will disable loader 0x%x "
1235                                    "on DV\n",
1236                                    device->cdev->dev.bus_id,
1237                                    sense->fmt.f71.md[1]);
1238                 else
1239                         PRINT_WARN("(%s): Repair will disable loader "
1240                                    "(0x%x-0x%x) on DV\n",
1241                                    device->cdev->dev.bus_id,
1242                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1243                 break;
1244         case 0x07:
1245                 PRINT_WARN("(%s): Repair will disable access to DV\n",
1246                            device->cdev->dev.bus_id);
1247                 break;
1248         case 0x08:
1249                 if (sense->fmt.f71.mdf == 0)
1250                         PRINT_WARN("(%s): Repair will disable message "
1251                                    "display 0x%x on DV\n",
1252                                    device->cdev->dev.bus_id,
1253                                    sense->fmt.f71.md[1]);
1254                 else
1255                         PRINT_WARN("(%s): Repair will disable message "
1256                                    "displays (0x%x-0x%x) on DV\n",
1257                                    device->cdev->dev.bus_id,
1258                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1259                 break;
1260         case 0x09:
1261                 PRINT_WARN("(%s): Clean DV\n", device->cdev->dev.bus_id);
1262                 break;
1263         default:
1264                 PRINT_WARN("(%s): DSIM ServiceMsg: 0x%02x\n",
1265                            device->cdev->dev.bus_id, sense->fmt.f71.smc);
1266         }
1267 }
1268
1269 /*
1270  * Print standard ERA Message
1271  */
1272 static void
1273 tape_3590_print_era_msg(struct tape_device *device, struct irb *irb)
1274 {
1275         struct tape_3590_sense *sense;
1276
1277         sense = (struct tape_3590_sense *) irb->ecw;
1278         if (sense->mc == 0)
1279                 return;
1280         if ((sense->mc > 0) && (sense->mc < TAPE_3590_MAX_MSG)) {
1281                 if (tape_3590_msg[sense->mc] != NULL)
1282                         PRINT_WARN("(%s): %s\n", device->cdev->dev.bus_id,
1283                                    tape_3590_msg[sense->mc]);
1284                 else {
1285                         PRINT_WARN("(%s): Message Code 0x%x\n",
1286                                    device->cdev->dev.bus_id, sense->mc);
1287                 }
1288                 return;
1289         }
1290         if (sense->mc == 0xf0) {
1291                 /* Standard Media Information Message */
1292                 PRINT_WARN("(%s): MIM SEV=%i, MC=%02x, ES=%x/%x, "
1293                            "RC=%02x-%04x-%02x\n", device->cdev->dev.bus_id,
1294                            sense->fmt.f70.sev, sense->mc,
1295                            sense->fmt.f70.emc, sense->fmt.f70.smc,
1296                            sense->fmt.f70.refcode, sense->fmt.f70.mid,
1297                            sense->fmt.f70.fid);
1298                 tape_3590_print_mim_msg_f0(device, irb);
1299                 return;
1300         }
1301         if (sense->mc == 0xf1) {
1302                 /* Standard I/O Subsystem Service Information Message */
1303                 PRINT_WARN("(%s): IOSIM SEV=%i, DEVTYPE=3590/%02x, "
1304                            "MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1305                            device->cdev->dev.bus_id, sense->fmt.f71.sev,
1306                            device->cdev->id.dev_model,
1307                            sense->mc, sense->fmt.f71.emc,
1308                            sense->fmt.f71.smc, sense->fmt.f71.refcode1,
1309                            sense->fmt.f71.refcode2, sense->fmt.f71.refcode3);
1310                 tape_3590_print_io_sim_msg_f1(device, irb);
1311                 return;
1312         }
1313         if (sense->mc == 0xf2) {
1314                 /* Standard Device Service Information Message */
1315                 PRINT_WARN("(%s): DEVSIM SEV=%i, DEVTYPE=3590/%02x, "
1316                            "MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1317                            device->cdev->dev.bus_id, sense->fmt.f71.sev,
1318                            device->cdev->id.dev_model,
1319                            sense->mc, sense->fmt.f71.emc,
1320                            sense->fmt.f71.smc, sense->fmt.f71.refcode1,
1321                            sense->fmt.f71.refcode2, sense->fmt.f71.refcode3);
1322                 tape_3590_print_dev_sim_msg_f2(device, irb);
1323                 return;
1324         }
1325         if (sense->mc == 0xf3) {
1326                 /* Standard Library Service Information Message */
1327                 return;
1328         }
1329         PRINT_WARN("(%s): Device Message(%x)\n",
1330                    device->cdev->dev.bus_id, sense->mc);
1331 }
1332
1333 static int tape_3590_crypt_error(struct tape_device *device,
1334                                  struct tape_request *request, struct irb *irb)
1335 {
1336         u8 cu_rc, ekm_rc1;
1337         u16 ekm_rc2;
1338         u32 drv_rc;
1339         char *bus_id, *sense;
1340
1341         sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
1342         bus_id = device->cdev->dev.bus_id;
1343         cu_rc = sense[0];
1344         drv_rc = *((u32*) &sense[5]) & 0xffffff;
1345         ekm_rc1 = sense[9];
1346         ekm_rc2 = *((u16*) &sense[10]);
1347         if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
1348                 /* key not defined on EKM */
1349                 return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
1350         if ((cu_rc == 1) || (cu_rc == 2))
1351                 /* No connection to EKM */
1352                 return tape_3590_erp_basic(device, request, irb, -ENOTCONN);
1353
1354         PRINT_ERR("(%s): Unable to get encryption key from EKM\n", bus_id);
1355         PRINT_ERR("(%s): CU=%02X DRIVE=%06X EKM=%02X:%04X\n", bus_id, cu_rc,
1356                 drv_rc, ekm_rc1, ekm_rc2);
1357
1358         return tape_3590_erp_basic(device, request, irb, -ENOKEY);
1359 }
1360
1361 /*
1362  *  3590 error Recovery routine:
1363  *  If possible, it tries to recover from the error. If this is not possible,
1364  *  inform the user about the problem.
1365  */
1366 static int
1367 tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
1368                      struct irb *irb)
1369 {
1370         struct tape_3590_sense *sense;
1371         int rc;
1372
1373 #ifdef CONFIG_S390_TAPE_BLOCK
1374         if (request->op == TO_BLOCK) {
1375                 /*
1376                  * Recovery for block device requests. Set the block_position
1377                  * to something invalid and retry.
1378                  */
1379                 device->blk_data.block_position = -1;
1380                 if (request->retries-- <= 0)
1381                         return tape_3590_erp_failed(device, request, irb, -EIO);
1382                 else
1383                         return tape_3590_erp_retry(device, request, irb);
1384         }
1385 #endif
1386
1387         sense = (struct tape_3590_sense *) irb->ecw;
1388
1389         DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);
1390
1391         /*
1392          * First check all RC-QRCs where we want to do something special
1393          *   - "break":     basic error recovery is done
1394          *   - "goto out:": just print error message if available
1395          */
1396         rc = -EIO;
1397         switch (sense->rc_rqc) {
1398
1399         case 0x1110:
1400                 tape_3590_print_era_msg(device, irb);
1401                 return tape_3590_erp_read_buf_log(device, request, irb);
1402
1403         case 0x2011:
1404                 tape_3590_print_era_msg(device, irb);
1405                 return tape_3590_erp_read_alternate(device, request, irb);
1406
1407         case 0x2230:
1408         case 0x2231:
1409                 tape_3590_print_era_msg(device, irb);
1410                 return tape_3590_erp_special_interrupt(device, request, irb);
1411         case 0x2240:
1412                 return tape_3590_crypt_error(device, request, irb);
1413
1414         case 0x3010:
1415                 DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
1416                           device->cdev_id);
1417                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1418         case 0x3012:
1419                 DBF_EVENT(2, "(%08x): Forward at End of Partition\n",
1420                           device->cdev_id);
1421                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1422         case 0x3020:
1423                 DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id);
1424                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1425
1426         case 0x3122:
1427                 DBF_EVENT(2, "(%08x): Rewind Unload initiated\n",
1428                           device->cdev_id);
1429                 return tape_3590_erp_basic(device, request, irb, -EIO);
1430         case 0x3123:
1431                 DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
1432                           device->cdev_id);
1433                 tape_med_state_set(device, MS_UNLOADED);
1434                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1435                 return tape_3590_erp_basic(device, request, irb, 0);
1436
1437         case 0x4010:
1438                 /*
1439                  * print additional msg since default msg
1440                  * "device intervention" is not very meaningfull
1441                  */
1442                 PRINT_WARN("(%s): Tape operation when medium not loaded\n",
1443                            device->cdev->dev.bus_id);
1444                 tape_med_state_set(device, MS_UNLOADED);
1445                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1446                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1447         case 0x4012:            /* Device Long Busy */
1448                 /* XXX: Also use long busy handling here? */
1449                 DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
1450                 tape_3590_print_era_msg(device, irb);
1451                 return tape_3590_erp_basic(device, request, irb, -EBUSY);
1452         case 0x4014:
1453                 DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
1454                 return tape_3590_erp_long_busy(device, request, irb);
1455
1456         case 0x5010:
1457                 if (sense->rac == 0xd0) {
1458                         /* Swap */
1459                         tape_3590_print_era_msg(device, irb);
1460                         return tape_3590_erp_swap(device, request, irb);
1461                 }
1462                 if (sense->rac == 0x26) {
1463                         /* Read Opposite */
1464                         tape_3590_print_era_msg(device, irb);
1465                         return tape_3590_erp_read_opposite(device, request,
1466                                                            irb);
1467                 }
1468                 return tape_3590_erp_basic(device, request, irb, -EIO);
1469         case 0x5020:
1470         case 0x5021:
1471         case 0x5022:
1472         case 0x5040:
1473         case 0x5041:
1474         case 0x5042:
1475                 tape_3590_print_era_msg(device, irb);
1476                 return tape_3590_erp_swap(device, request, irb);
1477
1478         case 0x5110:
1479         case 0x5111:
1480                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1481
1482         case 0x5120:
1483         case 0x1120:
1484                 tape_med_state_set(device, MS_UNLOADED);
1485                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1486                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1487
1488         case 0x6020:
1489                 PRINT_WARN("(%s): Cartridge of wrong type ?\n",
1490                            device->cdev->dev.bus_id);
1491                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1492
1493         case 0x8011:
1494                 PRINT_WARN("(%s): Another host has reserved the tape device\n",
1495                            device->cdev->dev.bus_id);
1496                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1497         case 0x8013:
1498                 PRINT_WARN("(%s): Another host has privileged access to the "
1499                            "tape device\n", device->cdev->dev.bus_id);
1500                 PRINT_WARN("(%s): To solve the problem unload the current "
1501                            "cartridge!\n", device->cdev->dev.bus_id);
1502                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1503         default:
1504                 return tape_3590_erp_basic(device, request, irb, -EIO);
1505         }
1506 }
1507
1508 /*
1509  * 3590 interrupt handler:
1510  */
1511 static int
1512 tape_3590_irq(struct tape_device *device, struct tape_request *request,
1513               struct irb *irb)
1514 {
1515         if (request == NULL)
1516                 return tape_3590_unsolicited_irq(device, irb);
1517
1518         if ((irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) &&
1519             (irb->scsw.dstat & DEV_STAT_DEV_END) && (request->op == TO_WRI)) {
1520                 /* Write at end of volume */
1521                 DBF_EVENT(2, "End of volume\n");
1522                 return tape_3590_erp_failed(device, request, irb, -ENOSPC);
1523         }
1524
1525         if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
1526                 return tape_3590_unit_check(device, request, irb);
1527
1528         if (irb->scsw.dstat & DEV_STAT_DEV_END) {
1529                 if (irb->scsw.dstat == DEV_STAT_UNIT_EXCEP) {
1530                         if (request->op == TO_FSB || request->op == TO_BSB)
1531                                 request->rescnt++;
1532                         else
1533                                 DBF_EVENT(5, "Unit Exception!\n");
1534                 }
1535
1536                 return tape_3590_done(device, request);
1537         }
1538
1539         if (irb->scsw.dstat & DEV_STAT_CHN_END) {
1540                 DBF_EVENT(2, "cannel end\n");
1541                 return TAPE_IO_PENDING;
1542         }
1543
1544         if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
1545                 DBF_EVENT(2, "Unit Attention when busy..\n");
1546                 return TAPE_IO_PENDING;
1547         }
1548
1549         DBF_EVENT(6, "xunknownirq\n");
1550         PRINT_ERR("Unexpected interrupt.\n");
1551         PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]);
1552         tape_dump_sense(device, request, irb);
1553         return TAPE_IO_STOP;
1554 }
1555
1556
1557 static int tape_3590_read_dev_chars(struct tape_device *device,
1558                                     struct tape_3590_rdc_data *rdc_data)
1559 {
1560         int rc;
1561         struct tape_request *request;
1562
1563         request = tape_alloc_request(1, sizeof(*rdc_data));
1564         if (IS_ERR(request))
1565                 return PTR_ERR(request);
1566         request->op = TO_RDC;
1567         tape_ccw_end(request->cpaddr, CCW_CMD_RDC, sizeof(*rdc_data),
1568                      request->cpdata);
1569         rc = tape_do_io(device, request);
1570         if (rc == 0)
1571                 memcpy(rdc_data, request->cpdata, sizeof(*rdc_data));
1572         tape_free_request(request);
1573         return rc;
1574 }
1575
1576 /*
1577  * Setup device function
1578  */
1579 static int
1580 tape_3590_setup_device(struct tape_device *device)
1581 {
1582         int rc;
1583         struct tape_3590_disc_data *data;
1584         struct tape_3590_rdc_data *rdc_data;
1585
1586         DBF_EVENT(6, "3590 device setup\n");
1587         data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
1588         if (data == NULL)
1589                 return -ENOMEM;
1590         data->read_back_op = READ_PREVIOUS;
1591         device->discdata = data;
1592
1593         rdc_data = kmalloc(sizeof(*rdc_data), GFP_KERNEL | GFP_DMA);
1594         if (!rdc_data) {
1595                 rc = -ENOMEM;
1596                 goto fail_kmalloc;
1597         }
1598         rc = tape_3590_read_dev_chars(device, rdc_data);
1599         if (rc) {
1600                 DBF_LH(3, "Read device characteristics failed!\n");
1601                 goto fail_kmalloc;
1602         }
1603         rc = tape_std_assign(device);
1604         if (rc)
1605                 goto fail_rdc_data;
1606         if (rdc_data->data[31] == 0x13) {
1607                 PRINT_INFO("Device has crypto support\n");
1608                 data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
1609                 tape_3592_disable_crypt(device);
1610         } else {
1611                 DBF_EVENT(6, "Device has NO crypto support\n");
1612         }
1613         /* Try to find out if medium is loaded */
1614         rc = tape_3590_sense_medium(device);
1615         if (rc) {
1616                 DBF_LH(3, "3590 medium sense returned %d\n", rc);
1617                 goto fail_rdc_data;
1618         }
1619         return 0;
1620
1621 fail_rdc_data:
1622         kfree(rdc_data);
1623 fail_kmalloc:
1624         kfree(data);
1625         return rc;
1626 }
1627
1628 /*
1629  * Cleanup device function
1630  */
1631 static void
1632 tape_3590_cleanup_device(struct tape_device *device)
1633 {
1634         flush_scheduled_work();
1635         tape_std_unassign(device);
1636
1637         kfree(device->discdata);
1638         device->discdata = NULL;
1639 }
1640
1641 /*
1642  * List of 3590 magnetic tape commands.
1643  */
1644 static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = {
1645         [MTRESET]        = tape_std_mtreset,
1646         [MTFSF]          = tape_std_mtfsf,
1647         [MTBSF]          = tape_std_mtbsf,
1648         [MTFSR]          = tape_std_mtfsr,
1649         [MTBSR]          = tape_std_mtbsr,
1650         [MTWEOF]         = tape_std_mtweof,
1651         [MTREW]          = tape_std_mtrew,
1652         [MTOFFL]         = tape_std_mtoffl,
1653         [MTNOP]          = tape_std_mtnop,
1654         [MTRETEN]        = tape_std_mtreten,
1655         [MTBSFM]         = tape_std_mtbsfm,
1656         [MTFSFM]         = tape_std_mtfsfm,
1657         [MTEOM]          = tape_std_mteom,
1658         [MTERASE]        = tape_std_mterase,
1659         [MTRAS1]         = NULL,
1660         [MTRAS2]         = NULL,
1661         [MTRAS3]         = NULL,
1662         [MTSETBLK]       = tape_std_mtsetblk,
1663         [MTSETDENSITY]   = NULL,
1664         [MTSEEK]         = tape_3590_mtseek,
1665         [MTTELL]         = tape_3590_mttell,
1666         [MTSETDRVBUFFER] = NULL,
1667         [MTFSS]          = NULL,
1668         [MTBSS]          = NULL,
1669         [MTWSM]          = NULL,
1670         [MTLOCK]         = NULL,
1671         [MTUNLOCK]       = NULL,
1672         [MTLOAD]         = tape_std_mtload,
1673         [MTUNLOAD]       = tape_std_mtunload,
1674         [MTCOMPRESSION]  = tape_std_mtcompression,
1675         [MTSETPART]      = NULL,
1676         [MTMKPART]       = NULL
1677 };
1678
1679 /*
1680  * Tape discipline structure for 3590.
1681  */
1682 static struct tape_discipline tape_discipline_3590 = {
1683         .owner = THIS_MODULE,
1684         .setup_device = tape_3590_setup_device,
1685         .cleanup_device = tape_3590_cleanup_device,
1686         .process_eov = tape_std_process_eov,
1687         .irq = tape_3590_irq,
1688         .read_block = tape_std_read_block,
1689         .write_block = tape_std_write_block,
1690 #ifdef CONFIG_S390_TAPE_BLOCK
1691         .bread = tape_3590_bread,
1692         .free_bread = tape_3590_free_bread,
1693         .check_locate = tape_3590_check_locate,
1694 #endif
1695         .ioctl_fn = tape_3590_ioctl,
1696         .mtop_array = tape_3590_mtop
1697 };
1698
1699 static struct ccw_device_id tape_3590_ids[] = {
1700         {CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590},
1701         {CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592},
1702         { /* end of list */ }
1703 };
1704
1705 static int
1706 tape_3590_online(struct ccw_device *cdev)
1707 {
1708         return tape_generic_online(cdev->dev.driver_data,
1709                                    &tape_discipline_3590);
1710 }
1711
1712 static int
1713 tape_3590_offline(struct ccw_device *cdev)
1714 {
1715         return tape_generic_offline(cdev->dev.driver_data);
1716 }
1717
1718 static struct ccw_driver tape_3590_driver = {
1719         .name = "tape_3590",
1720         .owner = THIS_MODULE,
1721         .ids = tape_3590_ids,
1722         .probe = tape_generic_probe,
1723         .remove = tape_generic_remove,
1724         .set_offline = tape_3590_offline,
1725         .set_online = tape_3590_online,
1726 };
1727
1728 /*
1729  * Setup discipline structure.
1730  */
1731 static int
1732 tape_3590_init(void)
1733 {
1734         int rc;
1735
1736         TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long));
1737         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1738 #ifdef DBF_LIKE_HELL
1739         debug_set_level(TAPE_DBF_AREA, 6);
1740 #endif
1741
1742         DBF_EVENT(3, "3590 init\n");
1743         /* Register driver for 3590 tapes. */
1744         rc = ccw_driver_register(&tape_3590_driver);
1745         if (rc)
1746                 DBF_EVENT(3, "3590 init failed\n");
1747         else
1748                 DBF_EVENT(3, "3590 registered\n");
1749         return rc;
1750 }
1751
1752 static void
1753 tape_3590_exit(void)
1754 {
1755         ccw_driver_unregister(&tape_3590_driver);
1756
1757         debug_unregister(TAPE_DBF_AREA);
1758 }
1759
1760 MODULE_DEVICE_TABLE(ccw, tape_3590_ids);
1761 MODULE_AUTHOR("(C) 2001,2006 IBM Corporation");
1762 MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver");
1763 MODULE_LICENSE("GPL");
1764
1765 module_init(tape_3590_init);
1766 module_exit(tape_3590_exit);