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   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, i;
 627         unsigned off;
 628         char *dst;
 629         struct bio_vec *bv;
 630         struct bio *bio;
 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_bio(bio, req) {
 637                 bio_for_each_segment(bv, bio, i) {
 638                         count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
 639                 }
 640         }
 641         request = tape_alloc_request(2 + count + 1, 4);
 642         if (IS_ERR(request))
 643                 return request;
 644         request->op = TO_BLOCK;
 645         *(__u32 *) request->cpdata = start_block;
 646         ccw = request->cpaddr;
 647         ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte);
 648
 649         /*
 650          * We always setup a nop after the mode set ccw. This slot is
 651          * used in tape_std_check_locate to insert a locate ccw if the
 652          * current tape position doesn't match the start block to be read.
 653          */
 654         ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
 655
 656         rq_for_each_bio(bio, req) {
 657                 bio_for_each_segment(bv, bio, i) {
 658                         dst = page_address(bv->bv_page) + bv->bv_offset;
 659                         for (off = 0; off < bv->bv_len;
 660                              off += TAPEBLOCK_HSEC_SIZE) {
 661                                 ccw->flags = CCW_FLAG_CC;
 662                                 ccw->cmd_code = READ_FORWARD;
 663                                 ccw->count = TAPEBLOCK_HSEC_SIZE;
 664                                 set_normalized_cda(ccw, (void *) __pa(dst));
 665                                 ccw++;
 666                                 dst += TAPEBLOCK_HSEC_SIZE;
 667                         }
 668                         if (off > bv->bv_len)
 669                                 BUG();
 670                 }
 671         }
 672         ccw = tape_ccw_end(ccw, NOP, 0, NULL);
 673         DBF_EVENT(6, "xBREDccwg\n");
 674         return request;
 675 }
 676
 677 static void
 678 tape_3590_free_bread(struct tape_request *request)
 679 {
 680         struct ccw1 *ccw;
 681
 682         /* Last ccw is a nop and doesn't need clear_normalized_cda */
 683         for (ccw = request->cpaddr; ccw->flags & CCW_FLAG_CC; ccw++)
 684                 if (ccw->cmd_code == READ_FORWARD)
 685                         clear_normalized_cda(ccw);
 686         tape_free_request(request);
 687 }
 688
 689 /*
 690  * check_locate is called just before the tape request is passed to
 691  * the common io layer for execution. It has to check the current
 692  * tape position and insert a locate ccw if it doesn't match the
 693  * start block for the request.
 694  */
 695 static void
 696 tape_3590_check_locate(struct tape_device *device, struct tape_request *request)
 697 {
 698         __u32 *start_block;
 699
 700         start_block = (__u32 *) request->cpdata;
 701         if (*start_block != device->blk_data.block_position) {
 702                 /* Add the start offset of the file to get the real block. */
 703                 *start_block += device->bof;
 704                 tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
 705         }
 706 }
 707 #endif
 708
 709 static void tape_3590_med_state_set(struct tape_device *device,
 710                                     struct tape_3590_med_sense *sense)
 711 {
 712         struct tape390_crypt_info *c_info;
 713
 714         c_info = &TAPE_3590_CRYPT_INFO(device);
 715
 716         if (sense->masst == MSENSE_UNASSOCIATED) {
 717                 tape_med_state_set(device, MS_UNLOADED);
 718                 TAPE_3590_CRYPT_INFO(device).medium_status = 0;
 719                 return;
 720         }
 721         if (sense->masst != MSENSE_ASSOCIATED_MOUNT) {
 722                 PRINT_ERR("Unknown medium state: %x\n", sense->masst);
 723                 return;
 724         }
 725         tape_med_state_set(device, MS_LOADED);
 726         c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
 727         if (sense->flags & MSENSE_CRYPT_MASK) {
 728                 PRINT_INFO("Medium is encrypted (%04x)\n", sense->flags);
 729                 c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
 730         } else  {
 731                 DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
 732                 c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
 733         }
 734 }
 735
 736 /*
 737  * The done handler is called at device/channel end and wakes up the sleeping
 738  * process
 739  */
 740 static int
 741 tape_3590_done(struct tape_device *device, struct tape_request *request)
 742 {
 743         struct tape_3590_disc_data *disc_data;
 744
 745         DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
 746         disc_data = device->discdata;
 747
 748         switch (request->op) {
 749         case TO_BSB:
 750         case TO_BSF:
 751         case TO_DSE:
 752         case TO_FSB:
 753         case TO_FSF:
 754         case TO_LBL:
 755         case TO_RFO:
 756         case TO_RBA:
 757         case TO_REW:
 758         case TO_WRI:
 759         case TO_WTM:
 760         case TO_BLOCK:
 761         case TO_LOAD:
 762                 tape_med_state_set(device, MS_LOADED);
 763                 break;
 764         case TO_RUN:
 765                 tape_med_state_set(device, MS_UNLOADED);
 766                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
 767                 break;
 768         case TO_MSEN:
 769                 tape_3590_med_state_set(device, request->cpdata);
 770                 break;
 771         case TO_CRYPT_ON:
 772                 TAPE_3590_CRYPT_INFO(device).status
 773                         |= TAPE390_CRYPT_ON_MASK;
 774                 *(device->modeset_byte) |= 0x03;
 775                 break;
 776         case TO_CRYPT_OFF:
 777                 TAPE_3590_CRYPT_INFO(device).status
 778                         &= ~TAPE390_CRYPT_ON_MASK;
 779                 *(device->modeset_byte) &= ~0x03;
 780                 break;
 781         case TO_RBI:    /* RBI seems to succeed even without medium loaded. */
 782         case TO_NOP:    /* Same to NOP. */
 783         case TO_READ_CONFIG:
 784         case TO_READ_ATTMSG:
 785         case TO_DIS:
 786         case TO_ASSIGN:
 787         case TO_UNASSIGN:
 788         case TO_SIZE:
 789         case TO_KEKL_SET:
 790         case TO_KEKL_QUERY:
 791                 break;
 792         }
 793         return TAPE_IO_SUCCESS;
 794 }
 795
 796 /*
 797  * This fuction is called, when error recovery was successfull
 798  */
 799 static inline int
 800 tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request)
 801 {
 802         DBF_EVENT(3, "Error Recovery successfull for %s\n",
 803                   tape_op_verbose[request->op]);
 804         return tape_3590_done(device, request);
 805 }
 806
 807 /*
 808  * This fuction is called, when error recovery was not successfull
 809  */
 810 static inline int
 811 tape_3590_erp_failed(struct tape_device *device, struct tape_request *request,
 812                      struct irb *irb, int rc)
 813 {
 814         DBF_EVENT(3, "Error Recovery failed for %s\n",
 815                   tape_op_verbose[request->op]);
 816         tape_dump_sense_dbf(device, request, irb);
 817         return rc;
 818 }
 819
 820 /*
 821  * Error Recovery do retry
 822  */
 823 static inline int
 824 tape_3590_erp_retry(struct tape_device *device, struct tape_request *request,
 825                     struct irb *irb)
 826 {
 827         DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]);
 828         tape_dump_sense_dbf(device, request, irb);
 829         return TAPE_IO_RETRY;
 830 }
 831
 832 /*
 833  * Handle unsolicited interrupts
 834  */
 835 static int
 836 tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb)
 837 {
 838         if (irb->scsw.dstat == DEV_STAT_CHN_END)
 839                 /* Probably result of halt ssch */
 840                 return TAPE_IO_PENDING;
 841         else if (irb->scsw.dstat == 0x85)
 842                 /* Device Ready -> check medium state */
 843                 tape_3590_schedule_work(device, TO_MSEN);
 844         else if (irb->scsw.dstat & DEV_STAT_ATTENTION)
 845                 tape_3590_schedule_work(device, TO_READ_ATTMSG);
 846         else {
 847                 DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
 848                 PRINT_WARN("Unsolicited IRQ (Device End) caught.\n");
 849                 tape_dump_sense(device, NULL, irb);
 850         }
 851         return TAPE_IO_SUCCESS;
 852 }
 853
 854 /*
 855  * Basic Recovery routine
 856  */
 857 static int
 858 tape_3590_erp_basic(struct tape_device *device, struct tape_request *request,
 859                     struct irb *irb, int rc)
 860 {
 861         struct tape_3590_sense *sense;
 862
 863         sense = (struct tape_3590_sense *) irb->ecw;
 864
 865         switch (sense->bra) {
 866         case SENSE_BRA_PER:
 867                 return tape_3590_erp_failed(device, request, irb, rc);
 868         case SENSE_BRA_CONT:
 869                 return tape_3590_erp_succeded(device, request);
 870         case SENSE_BRA_RE:
 871                 return tape_3590_erp_retry(device, request, irb);
 872         case SENSE_BRA_DRE:
 873                 return tape_3590_erp_failed(device, request, irb, rc);
 874         default:
 875                 PRINT_ERR("Unknown BRA %x - This should not happen!\n",
 876                           sense->bra);
 877                 BUG();
 878                 return TAPE_IO_STOP;
 879         }
 880 }
 881
 882 /*
 883  *  RDL: Read Device (buffered) log
 884  */
 885 static int
 886 tape_3590_erp_read_buf_log(struct tape_device *device,
 887                            struct tape_request *request, struct irb *irb)
 888 {
 889         /*
 890          * We just do the basic error recovery at the moment (retry).
 891          * Perhaps in the future, we read the log and dump it somewhere...
 892          */
 893         return tape_3590_erp_basic(device, request, irb, -EIO);
 894 }
 895
 896 /*
 897  *  SWAP: Swap Devices
 898  */
 899 static int
 900 tape_3590_erp_swap(struct tape_device *device, struct tape_request *request,
 901                    struct irb *irb)
 902 {
 903         /*
 904          * This error recovery should swap the tapes
 905          * if the original has a problem. The operation
 906          * should proceed with the new tape... this
 907          * should probably be done in user space!
 908          */
 909         PRINT_WARN("(%s): Swap Tape Device!\n", device->cdev->dev.bus_id);
 910         return tape_3590_erp_basic(device, request, irb, -EIO);
 911 }
 912
 913 /*
 914  *  LBY: Long Busy
 915  */
 916 static int
 917 tape_3590_erp_long_busy(struct tape_device *device,
 918                         struct tape_request *request, struct irb *irb)
 919 {
 920         DBF_EVENT(6, "Device is busy\n");
 921         return TAPE_IO_LONG_BUSY;
 922 }
 923
 924 /*
 925  *  SPI: Special Intercept
 926  */
 927 static int
 928 tape_3590_erp_special_interrupt(struct tape_device *device,
 929                                 struct tape_request *request, struct irb *irb)
 930 {
 931         return tape_3590_erp_basic(device, request, irb, -EIO);
 932 }
 933
 934 /*
 935  *  RDA: Read Alternate
 936  */
 937 static int
 938 tape_3590_erp_read_alternate(struct tape_device *device,
 939                              struct tape_request *request, struct irb *irb)
 940 {
 941         struct tape_3590_disc_data *data;
 942
 943         /*
 944          * The issued Read Backward or Read Previous command is not
 945          * supported by the device
 946          * The recovery action should be to issue another command:
 947          * Read Revious: if Read Backward is not supported
 948          * Read Backward: if Read Previous is not supported
 949          */
 950         data = device->discdata;
 951         if (data->read_back_op == READ_PREVIOUS) {
 952                 DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n",
 953                           device->cdev_id);
 954                 data->read_back_op = READ_BACKWARD;
 955         } else {
 956                 DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n",
 957                           device->cdev_id);
 958                 data->read_back_op = READ_PREVIOUS;
 959         }
 960         tape_3590_read_opposite(device, request);
 961         return tape_3590_erp_retry(device, request, irb);
 962 }
 963
 964 /*
 965  * Error Recovery read opposite
 966  */
 967 static int
 968 tape_3590_erp_read_opposite(struct tape_device *device,
 969                             struct tape_request *request, struct irb *irb)
 970 {
 971         switch (request->op) {
 972         case TO_RFO:
 973                 /*
 974                  * We did read forward, but the data could not be read.
 975                  * We will read backward and then skip forward again.
 976                  */
 977                 tape_3590_read_opposite(device, request);
 978                 return tape_3590_erp_retry(device, request, irb);
 979         case TO_RBA:
 980                 /* We tried to read forward and backward, but hat no success */
 981                 return tape_3590_erp_failed(device, request, irb, -EIO);
 982                 break;
 983         default:
 984                 PRINT_WARN("read_opposite_recovery_called_with_op: %s\n",
 985                            tape_op_verbose[request->op]);
 986                 return tape_3590_erp_failed(device, request, irb, -EIO);
 987         }
 988 }
 989
 990 /*
 991  * Print an MIM (Media Information  Message) (message code f0)
 992  */
 993 static void
 994 tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb)
 995 {
 996         struct tape_3590_sense *sense;
 997
 998         sense = (struct tape_3590_sense *) irb->ecw;
 999         /* Exception Message */
1000         switch (sense->fmt.f70.emc) {
1001         case 0x02:
1002                 PRINT_WARN("(%s): Data degraded\n", device->cdev->dev.bus_id);
1003                 break;
1004         case 0x03:
1005                 PRINT_WARN("(%s): Data degraded in partion %i\n",
1006                            device->cdev->dev.bus_id, sense->fmt.f70.mp);
1007                 break;
1008         case 0x04:
1009                 PRINT_WARN("(%s): Medium degraded\n", device->cdev->dev.bus_id);
1010                 break;
1011         case 0x05:
1012                 PRINT_WARN("(%s): Medium degraded in partition %i\n",
1013                            device->cdev->dev.bus_id, sense->fmt.f70.mp);
1014                 break;
1015         case 0x06:
1016                 PRINT_WARN("(%s): Block 0 Error\n", device->cdev->dev.bus_id);
1017                 break;
1018         case 0x07:
1019                 PRINT_WARN("(%s): Medium Exception 0x%02x\n",
1020                            device->cdev->dev.bus_id, sense->fmt.f70.md);
1021                 break;
1022         default:
1023                 PRINT_WARN("(%s): MIM ExMsg: 0x%02x\n",
1024                            device->cdev->dev.bus_id, sense->fmt.f70.emc);
1025                 break;
1026         }
1027         /* Service Message */
1028         switch (sense->fmt.f70.smc) {
1029         case 0x02:
1030                 PRINT_WARN("(%s): Reference Media maintenance procedure %i\n",
1031                            device->cdev->dev.bus_id, sense->fmt.f70.md);
1032                 break;
1033         default:
1034                 PRINT_WARN("(%s): MIM ServiceMsg: 0x%02x\n",
1035                            device->cdev->dev.bus_id, sense->fmt.f70.smc);
1036                 break;
1037         }
1038 }
1039
1040 /*
1041  * Print an I/O Subsystem Service Information Message (message code f1)
1042  */
1043 static void
1044 tape_3590_print_io_sim_msg_f1(struct tape_device *device, struct irb *irb)
1045 {
1046         struct tape_3590_sense *sense;
1047
1048         sense = (struct tape_3590_sense *) irb->ecw;
1049         /* Exception Message */
1050         switch (sense->fmt.f71.emc) {
1051         case 0x01:
1052                 PRINT_WARN("(%s): Effect of failure is unknown\n",
1053                            device->cdev->dev.bus_id);
1054                 break;
1055         case 0x02:
1056                 PRINT_WARN("(%s): CU Exception - no performance impact\n",
1057                            device->cdev->dev.bus_id);
1058                 break;
1059         case 0x03:
1060                 PRINT_WARN("(%s): CU Exception on channel interface 0x%02x\n",
1061                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1062                 break;
1063         case 0x04:
1064                 PRINT_WARN("(%s): CU Exception on device path 0x%02x\n",
1065                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1066                 break;
1067         case 0x05:
1068                 PRINT_WARN("(%s): CU Exception on library path 0x%02x\n",
1069                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1070                 break;
1071         case 0x06:
1072                 PRINT_WARN("(%s): CU Exception on node 0x%02x\n",
1073                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1074                 break;
1075         case 0x07:
1076                 PRINT_WARN("(%s): CU Exception on partition 0x%02x\n",
1077                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1078                 break;
1079         default:
1080                 PRINT_WARN("(%s): SIM ExMsg: 0x%02x\n",
1081                            device->cdev->dev.bus_id, sense->fmt.f71.emc);
1082         }
1083         /* Service Message */
1084         switch (sense->fmt.f71.smc) {
1085         case 0x01:
1086                 PRINT_WARN("(%s): Repair impact is unknown\n",
1087                            device->cdev->dev.bus_id);
1088                 break;
1089         case 0x02:
1090                 PRINT_WARN("(%s): Repair will not impact cu performance\n",
1091                            device->cdev->dev.bus_id);
1092                 break;
1093         case 0x03:
1094                 if (sense->fmt.f71.mdf == 0)
1095                         PRINT_WARN("(%s): Repair will disable node "
1096                                    "0x%x on CU\n",
1097                                    device->cdev->dev.bus_id,
1098                                    sense->fmt.f71.md[1]);
1099                 else
1100                         PRINT_WARN("(%s): Repair will disable nodes "
1101                                    "(0x%x-0x%x) on CU\n",
1102                                    device->cdev->dev.bus_id,
1103                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1104                 break;
1105         case 0x04:
1106                 if (sense->fmt.f71.mdf == 0)
1107                         PRINT_WARN("(%s): Repair will disable cannel path "
1108                                    "0x%x on CU\n",
1109                                    device->cdev->dev.bus_id,
1110                                    sense->fmt.f71.md[1]);
1111                 else
1112                         PRINT_WARN("(%s): Repair will disable cannel paths "
1113                                    "(0x%x-0x%x) on CU\n",
1114                                    device->cdev->dev.bus_id,
1115                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1116                 break;
1117         case 0x05:
1118                 if (sense->fmt.f71.mdf == 0)
1119                         PRINT_WARN("(%s): Repair will disable device path "
1120                                    "0x%x on CU\n",
1121                                    device->cdev->dev.bus_id,
1122                                    sense->fmt.f71.md[1]);
1123                 else
1124                         PRINT_WARN("(%s): Repair will disable device paths "
1125                                    "(0x%x-0x%x) on CU\n",
1126                                    device->cdev->dev.bus_id,
1127                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1128                 break;
1129         case 0x06:
1130                 if (sense->fmt.f71.mdf == 0)
1131                         PRINT_WARN("(%s): Repair will disable library path "
1132                                    "0x%x on CU\n",
1133                                    device->cdev->dev.bus_id,
1134                                    sense->fmt.f71.md[1]);
1135                 else
1136                         PRINT_WARN("(%s): Repair will disable library paths "
1137                                    "(0x%x-0x%x) on CU\n",
1138                                    device->cdev->dev.bus_id,
1139                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1140                 break;
1141         case 0x07:
1142                 PRINT_WARN("(%s): Repair will disable access to CU\n",
1143                            device->cdev->dev.bus_id);
1144                 break;
1145         default:
1146                 PRINT_WARN("(%s): SIM ServiceMsg: 0x%02x\n",
1147                            device->cdev->dev.bus_id, sense->fmt.f71.smc);
1148         }
1149 }
1150
1151 /*
1152  * Print an Device Subsystem Service Information Message (message code f2)
1153  */
1154 static void
1155 tape_3590_print_dev_sim_msg_f2(struct tape_device *device, struct irb *irb)
1156 {
1157         struct tape_3590_sense *sense;
1158
1159         sense = (struct tape_3590_sense *) irb->ecw;
1160         /* Exception Message */
1161         switch (sense->fmt.f71.emc) {
1162         case 0x01:
1163                 PRINT_WARN("(%s): Effect of failure is unknown\n",
1164                            device->cdev->dev.bus_id);
1165                 break;
1166         case 0x02:
1167                 PRINT_WARN("(%s): DV Exception - no performance impact\n",
1168                            device->cdev->dev.bus_id);
1169                 break;
1170         case 0x03:
1171                 PRINT_WARN("(%s): DV Exception on channel interface 0x%02x\n",
1172                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1173                 break;
1174         case 0x04:
1175                 PRINT_WARN("(%s): DV Exception on loader 0x%02x\n",
1176                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1177                 break;
1178         case 0x05:
1179                 PRINT_WARN("(%s): DV Exception on message display 0x%02x\n",
1180                            device->cdev->dev.bus_id, sense->fmt.f71.md[0]);
1181                 break;
1182         case 0x06:
1183                 PRINT_WARN("(%s): DV Exception in tape path\n",
1184                            device->cdev->dev.bus_id);
1185                 break;
1186         case 0x07:
1187                 PRINT_WARN("(%s): DV Exception in drive\n",
1188                            device->cdev->dev.bus_id);
1189                 break;
1190         default:
1191                 PRINT_WARN("(%s): DSIM ExMsg: 0x%02x\n",
1192                            device->cdev->dev.bus_id, sense->fmt.f71.emc);
1193         }
1194         /* Service Message */
1195         switch (sense->fmt.f71.smc) {
1196         case 0x01:
1197                 PRINT_WARN("(%s): Repair impact is unknown\n",
1198                            device->cdev->dev.bus_id);
1199                 break;
1200         case 0x02:
1201                 PRINT_WARN("(%s): Repair will not impact device performance\n",
1202                            device->cdev->dev.bus_id);
1203                 break;
1204         case 0x03:
1205                 if (sense->fmt.f71.mdf == 0)
1206                         PRINT_WARN("(%s): Repair will disable channel path "
1207                                    "0x%x on DV\n",
1208                                    device->cdev->dev.bus_id,
1209                                    sense->fmt.f71.md[1]);
1210                 else
1211                         PRINT_WARN("(%s): Repair will disable channel path "
1212                                    "(0x%x-0x%x) on DV\n",
1213                                    device->cdev->dev.bus_id,
1214                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1215                 break;
1216         case 0x04:
1217                 if (sense->fmt.f71.mdf == 0)
1218                         PRINT_WARN("(%s): Repair will disable interface 0x%x "
1219                                    "on DV\n",
1220                                    device->cdev->dev.bus_id,
1221                                    sense->fmt.f71.md[1]);
1222                 else
1223                         PRINT_WARN("(%s): Repair will disable interfaces "
1224                                    "(0x%x-0x%x) on DV\n",
1225                                    device->cdev->dev.bus_id,
1226                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1227                 break;
1228         case 0x05:
1229                 if (sense->fmt.f71.mdf == 0)
1230                         PRINT_WARN("(%s): Repair will disable loader 0x%x "
1231                                    "on DV\n",
1232                                    device->cdev->dev.bus_id,
1233                                    sense->fmt.f71.md[1]);
1234                 else
1235                         PRINT_WARN("(%s): Repair will disable loader "
1236                                    "(0x%x-0x%x) on DV\n",
1237                                    device->cdev->dev.bus_id,
1238                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1239                 break;
1240         case 0x07:
1241                 PRINT_WARN("(%s): Repair will disable access to DV\n",
1242                            device->cdev->dev.bus_id);
1243                 break;
1244         case 0x08:
1245                 if (sense->fmt.f71.mdf == 0)
1246                         PRINT_WARN("(%s): Repair will disable message "
1247                                    "display 0x%x on DV\n",
1248                                    device->cdev->dev.bus_id,
1249                                    sense->fmt.f71.md[1]);
1250                 else
1251                         PRINT_WARN("(%s): Repair will disable message "
1252                                    "displays (0x%x-0x%x) on DV\n",
1253                                    device->cdev->dev.bus_id,
1254                                    sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1255                 break;
1256         case 0x09:
1257                 PRINT_WARN("(%s): Clean DV\n", device->cdev->dev.bus_id);
1258                 break;
1259         default:
1260                 PRINT_WARN("(%s): DSIM ServiceMsg: 0x%02x\n",
1261                            device->cdev->dev.bus_id, sense->fmt.f71.smc);
1262         }
1263 }
1264
1265 /*
1266  * Print standard ERA Message
1267  */
1268 static void
1269 tape_3590_print_era_msg(struct tape_device *device, struct irb *irb)
1270 {
1271         struct tape_3590_sense *sense;
1272
1273         sense = (struct tape_3590_sense *) irb->ecw;
1274         if (sense->mc == 0)
1275                 return;
1276         if ((sense->mc > 0) && (sense->mc < TAPE_3590_MAX_MSG)) {
1277                 if (tape_3590_msg[sense->mc] != NULL)
1278                         PRINT_WARN("(%s): %s\n", device->cdev->dev.bus_id,
1279                                    tape_3590_msg[sense->mc]);
1280                 else {
1281                         PRINT_WARN("(%s): Message Code 0x%x\n",
1282                                    device->cdev->dev.bus_id, sense->mc);
1283                 }
1284                 return;
1285         }
1286         if (sense->mc == 0xf0) {
1287                 /* Standard Media Information Message */
1288                 PRINT_WARN("(%s): MIM SEV=%i, MC=%02x, ES=%x/%x, "
1289                            "RC=%02x-%04x-%02x\n", device->cdev->dev.bus_id,
1290                            sense->fmt.f70.sev, sense->mc,
1291                            sense->fmt.f70.emc, sense->fmt.f70.smc,
1292                            sense->fmt.f70.refcode, sense->fmt.f70.mid,
1293                            sense->fmt.f70.fid);
1294                 tape_3590_print_mim_msg_f0(device, irb);
1295                 return;
1296         }
1297         if (sense->mc == 0xf1) {
1298                 /* Standard I/O Subsystem Service Information Message */
1299                 PRINT_WARN("(%s): IOSIM SEV=%i, DEVTYPE=3590/%02x, "
1300                            "MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1301                            device->cdev->dev.bus_id, sense->fmt.f71.sev,
1302                            device->cdev->id.dev_model,
1303                            sense->mc, sense->fmt.f71.emc,
1304                            sense->fmt.f71.smc, sense->fmt.f71.refcode1,
1305                            sense->fmt.f71.refcode2, sense->fmt.f71.refcode3);
1306                 tape_3590_print_io_sim_msg_f1(device, irb);
1307                 return;
1308         }
1309         if (sense->mc == 0xf2) {
1310                 /* Standard Device Service Information Message */
1311                 PRINT_WARN("(%s): DEVSIM SEV=%i, DEVTYPE=3590/%02x, "
1312                            "MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1313                            device->cdev->dev.bus_id, sense->fmt.f71.sev,
1314                            device->cdev->id.dev_model,
1315                            sense->mc, sense->fmt.f71.emc,
1316                            sense->fmt.f71.smc, sense->fmt.f71.refcode1,
1317                            sense->fmt.f71.refcode2, sense->fmt.f71.refcode3);
1318                 tape_3590_print_dev_sim_msg_f2(device, irb);
1319                 return;
1320         }
1321         if (sense->mc == 0xf3) {
1322                 /* Standard Library Service Information Message */
1323                 return;
1324         }
1325         PRINT_WARN("(%s): Device Message(%x)\n",
1326                    device->cdev->dev.bus_id, sense->mc);
1327 }
1328
1329 static int tape_3590_crypt_error(struct tape_device *device,
1330                                  struct tape_request *request, struct irb *irb)
1331 {
1332         u8 cu_rc, ekm_rc1;
1333         u16 ekm_rc2;
1334         u32 drv_rc;
1335         char *bus_id, *sense;
1336
1337         sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
1338         bus_id = device->cdev->dev.bus_id;
1339         cu_rc = sense[0];
1340         drv_rc = *((u32*) &sense[5]) & 0xffffff;
1341         ekm_rc1 = sense[9];
1342         ekm_rc2 = *((u16*) &sense[10]);
1343         if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
1344                 /* key not defined on EKM */
1345                 return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
1346         if ((cu_rc == 1) || (cu_rc == 2))
1347                 /* No connection to EKM */
1348                 return tape_3590_erp_basic(device, request, irb, -ENOTCONN);
1349
1350         PRINT_ERR("(%s): Unable to get encryption key from EKM\n", bus_id);
1351         PRINT_ERR("(%s): CU=%02X DRIVE=%06X EKM=%02X:%04X\n", bus_id, cu_rc,
1352                 drv_rc, ekm_rc1, ekm_rc2);
1353
1354         return tape_3590_erp_basic(device, request, irb, -ENOKEY);
1355 }
1356
1357 /*
1358  *  3590 error Recovery routine:
1359  *  If possible, it tries to recover from the error. If this is not possible,
1360  *  inform the user about the problem.
1361  */
1362 static int
1363 tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
1364                      struct irb *irb)
1365 {
1366         struct tape_3590_sense *sense;
1367         int rc;
1368
1369 #ifdef CONFIG_S390_TAPE_BLOCK
1370         if (request->op == TO_BLOCK) {
1371                 /*
1372                  * Recovery for block device requests. Set the block_position
1373                  * to something invalid and retry.
1374                  */
1375                 device->blk_data.block_position = -1;
1376                 if (request->retries-- <= 0)
1377                         return tape_3590_erp_failed(device, request, irb, -EIO);
1378                 else
1379                         return tape_3590_erp_retry(device, request, irb);
1380         }
1381 #endif
1382
1383         sense = (struct tape_3590_sense *) irb->ecw;
1384
1385         DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);
1386
1387         /*
1388          * First check all RC-QRCs where we want to do something special
1389          *   - "break":     basic error recovery is done
1390          *   - "goto out:": just print error message if available
1391          */
1392         rc = -EIO;
1393         switch (sense->rc_rqc) {
1394
1395         case 0x1110:
1396                 tape_3590_print_era_msg(device, irb);
1397                 return tape_3590_erp_read_buf_log(device, request, irb);
1398
1399         case 0x2011:
1400                 tape_3590_print_era_msg(device, irb);
1401                 return tape_3590_erp_read_alternate(device, request, irb);
1402
1403         case 0x2230:
1404         case 0x2231:
1405                 tape_3590_print_era_msg(device, irb);
1406                 return tape_3590_erp_special_interrupt(device, request, irb);
1407         case 0x2240:
1408                 return tape_3590_crypt_error(device, request, irb);
1409
1410         case 0x3010:
1411                 DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
1412                           device->cdev_id);
1413                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1414         case 0x3012:
1415                 DBF_EVENT(2, "(%08x): Forward at End of Partition\n",
1416                           device->cdev_id);
1417                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1418         case 0x3020:
1419                 DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id);
1420                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1421
1422         case 0x3122:
1423                 DBF_EVENT(2, "(%08x): Rewind Unload initiated\n",
1424                           device->cdev_id);
1425                 return tape_3590_erp_basic(device, request, irb, -EIO);
1426         case 0x3123:
1427                 DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
1428                           device->cdev_id);
1429                 tape_med_state_set(device, MS_UNLOADED);
1430                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1431                 return tape_3590_erp_basic(device, request, irb, 0);
1432
1433         case 0x4010:
1434                 /*
1435                  * print additional msg since default msg
1436                  * "device intervention" is not very meaningfull
1437                  */
1438                 PRINT_WARN("(%s): Tape operation when medium not loaded\n",
1439                            device->cdev->dev.bus_id);
1440                 tape_med_state_set(device, MS_UNLOADED);
1441                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1442                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1443         case 0x4012:            /* Device Long Busy */
1444                 /* XXX: Also use long busy handling here? */
1445                 DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
1446                 tape_3590_print_era_msg(device, irb);
1447                 return tape_3590_erp_basic(device, request, irb, -EBUSY);
1448         case 0x4014:
1449                 DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
1450                 return tape_3590_erp_long_busy(device, request, irb);
1451
1452         case 0x5010:
1453                 if (sense->rac == 0xd0) {
1454                         /* Swap */
1455                         tape_3590_print_era_msg(device, irb);
1456                         return tape_3590_erp_swap(device, request, irb);
1457                 }
1458                 if (sense->rac == 0x26) {
1459                         /* Read Opposite */
1460                         tape_3590_print_era_msg(device, irb);
1461                         return tape_3590_erp_read_opposite(device, request,
1462                                                            irb);
1463                 }
1464                 return tape_3590_erp_basic(device, request, irb, -EIO);
1465         case 0x5020:
1466         case 0x5021:
1467         case 0x5022:
1468         case 0x5040:
1469         case 0x5041:
1470         case 0x5042:
1471                 tape_3590_print_era_msg(device, irb);
1472                 return tape_3590_erp_swap(device, request, irb);
1473
1474         case 0x5110:
1475         case 0x5111:
1476                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1477
1478         case 0x5120:
1479         case 0x1120:
1480                 tape_med_state_set(device, MS_UNLOADED);
1481                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1482                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1483
1484         case 0x6020:
1485                 PRINT_WARN("(%s): Cartridge of wrong type ?\n",
1486                            device->cdev->dev.bus_id);
1487                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1488
1489         case 0x8011:
1490                 PRINT_WARN("(%s): Another host has reserved the tape device\n",
1491                            device->cdev->dev.bus_id);
1492                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1493         case 0x8013:
1494                 PRINT_WARN("(%s): Another host has priviliged access to the "
1495                            "tape device\n", device->cdev->dev.bus_id);
1496                 PRINT_WARN("(%s): To solve the problem unload the current "
1497                            "cartridge!\n", device->cdev->dev.bus_id);
1498                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1499         default:
1500                 return tape_3590_erp_basic(device, request, irb, -EIO);
1501         }
1502 }
1503
1504 /*
1505  * 3590 interrupt handler:
1506  */
1507 static int
1508 tape_3590_irq(struct tape_device *device, struct tape_request *request,
1509               struct irb *irb)
1510 {
1511         if (request == NULL)
1512                 return tape_3590_unsolicited_irq(device, irb);
1513
1514         if ((irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) &&
1515             (irb->scsw.dstat & DEV_STAT_DEV_END) && (request->op == TO_WRI)) {
1516                 /* Write at end of volume */
1517                 DBF_EVENT(2, "End of volume\n");
1518                 return tape_3590_erp_failed(device, request, irb, -ENOSPC);
1519         }
1520
1521         if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
1522                 return tape_3590_unit_check(device, request, irb);
1523
1524         if (irb->scsw.dstat & DEV_STAT_DEV_END) {
1525                 if (irb->scsw.dstat == DEV_STAT_UNIT_EXCEP) {
1526                         if (request->op == TO_FSB || request->op == TO_BSB)
1527                                 request->rescnt++;
1528                         else
1529                                 DBF_EVENT(5, "Unit Exception!\n");
1530                 }
1531
1532                 return tape_3590_done(device, request);
1533         }
1534
1535         if (irb->scsw.dstat & DEV_STAT_CHN_END) {
1536                 DBF_EVENT(2, "cannel end\n");
1537                 return TAPE_IO_PENDING;
1538         }
1539
1540         if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
1541                 DBF_EVENT(2, "Unit Attention when busy..\n");
1542                 return TAPE_IO_PENDING;
1543         }
1544
1545         DBF_EVENT(6, "xunknownirq\n");
1546         PRINT_ERR("Unexpected interrupt.\n");
1547         PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]);
1548         tape_dump_sense(device, request, irb);
1549         return TAPE_IO_STOP;
1550 }
1551
1552 /*
1553  * Setup device function
1554  */
1555 static int
1556 tape_3590_setup_device(struct tape_device *device)
1557 {
1558         int rc;
1559         struct tape_3590_disc_data *data;
1560         char *rdc_data;
1561
1562         DBF_EVENT(6, "3590 device setup\n");
1563         data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
1564         if (data == NULL)
1565                 return -ENOMEM;
1566         data->read_back_op = READ_PREVIOUS;
1567         device->discdata = data;
1568
1569         rdc_data = kmalloc(64, GFP_KERNEL | GFP_DMA);
1570         if (!rdc_data) {
1571                 rc = -ENOMEM;
1572                 goto fail_kmalloc;
1573         }
1574         rc = read_dev_chars(device->cdev, (void**)&rdc_data, 64);
1575         if (rc) {
1576                 DBF_LH(3, "Read device characteristics failed!\n");
1577                 goto fail_kmalloc;
1578         }
1579         rc = tape_std_assign(device);
1580         if (rc)
1581                 goto fail_rdc_data;
1582         if (rdc_data[31] == 0x13) {
1583                 PRINT_INFO("Device has crypto support\n");
1584                 data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
1585                 tape_3592_disable_crypt(device);
1586         } else {
1587                 DBF_EVENT(6, "Device has NO crypto support\n");
1588         }
1589         /* Try to find out if medium is loaded */
1590         rc = tape_3590_sense_medium(device);
1591         if (rc) {
1592                 DBF_LH(3, "3590 medium sense returned %d\n", rc);
1593                 goto fail_rdc_data;
1594         }
1595         return 0;
1596
1597 fail_rdc_data:
1598         kfree(rdc_data);
1599 fail_kmalloc:
1600         kfree(data);
1601         return rc;
1602 }
1603
1604 /*
1605  * Cleanup device function
1606  */
1607 static void
1608 tape_3590_cleanup_device(struct tape_device *device)
1609 {
1610         flush_scheduled_work();
1611         tape_std_unassign(device);
1612
1613         kfree(device->discdata);
1614         device->discdata = NULL;
1615 }
1616
1617 /*
1618  * List of 3590 magnetic tape commands.
1619  */
1620 static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = {
1621         [MTRESET]        = tape_std_mtreset,
1622         [MTFSF]          = tape_std_mtfsf,
1623         [MTBSF]          = tape_std_mtbsf,
1624         [MTFSR]          = tape_std_mtfsr,
1625         [MTBSR]          = tape_std_mtbsr,
1626         [MTWEOF]         = tape_std_mtweof,
1627         [MTREW]          = tape_std_mtrew,
1628         [MTOFFL]         = tape_std_mtoffl,
1629         [MTNOP]          = tape_std_mtnop,
1630         [MTRETEN]        = tape_std_mtreten,
1631         [MTBSFM]         = tape_std_mtbsfm,
1632         [MTFSFM]         = tape_std_mtfsfm,
1633         [MTEOM]          = tape_std_mteom,
1634         [MTERASE]        = tape_std_mterase,
1635         [MTRAS1]         = NULL,
1636         [MTRAS2]         = NULL,
1637         [MTRAS3]         = NULL,
1638         [MTSETBLK]       = tape_std_mtsetblk,
1639         [MTSETDENSITY]   = NULL,
1640         [MTSEEK]         = tape_3590_mtseek,
1641         [MTTELL]         = tape_3590_mttell,
1642         [MTSETDRVBUFFER] = NULL,
1643         [MTFSS]          = NULL,
1644         [MTBSS]          = NULL,
1645         [MTWSM]          = NULL,
1646         [MTLOCK]         = NULL,
1647         [MTUNLOCK]       = NULL,
1648         [MTLOAD]         = tape_std_mtload,
1649         [MTUNLOAD]       = tape_std_mtunload,
1650         [MTCOMPRESSION]  = tape_std_mtcompression,
1651         [MTSETPART]      = NULL,
1652         [MTMKPART]       = NULL
1653 };
1654
1655 /*
1656  * Tape discipline structure for 3590.
1657  */
1658 static struct tape_discipline tape_discipline_3590 = {
1659         .owner = THIS_MODULE,
1660         .setup_device = tape_3590_setup_device,
1661         .cleanup_device = tape_3590_cleanup_device,
1662         .process_eov = tape_std_process_eov,
1663         .irq = tape_3590_irq,
1664         .read_block = tape_std_read_block,
1665         .write_block = tape_std_write_block,
1666 #ifdef CONFIG_S390_TAPE_BLOCK
1667         .bread = tape_3590_bread,
1668         .free_bread = tape_3590_free_bread,
1669         .check_locate = tape_3590_check_locate,
1670 #endif
1671         .ioctl_fn = tape_3590_ioctl,
1672         .mtop_array = tape_3590_mtop
1673 };
1674
1675 static struct ccw_device_id tape_3590_ids[] = {
1676         {CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590},
1677         {CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592},
1678         { /* end of list */ }
1679 };
1680
1681 static int
1682 tape_3590_online(struct ccw_device *cdev)
1683 {
1684         return tape_generic_online(cdev->dev.driver_data,
1685                                    &tape_discipline_3590);
1686 }
1687
1688 static int
1689 tape_3590_offline(struct ccw_device *cdev)
1690 {
1691         return tape_generic_offline(cdev->dev.driver_data);
1692 }
1693
1694 static struct ccw_driver tape_3590_driver = {
1695         .name = "tape_3590",
1696         .owner = THIS_MODULE,
1697         .ids = tape_3590_ids,
1698         .probe = tape_generic_probe,
1699         .remove = tape_generic_remove,
1700         .set_offline = tape_3590_offline,
1701         .set_online = tape_3590_online,
1702 };
1703
1704 /*
1705  * Setup discipline structure.
1706  */
1707 static int
1708 tape_3590_init(void)
1709 {
1710         int rc;
1711
1712         TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long));
1713         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1714 #ifdef DBF_LIKE_HELL
1715         debug_set_level(TAPE_DBF_AREA, 6);
1716 #endif
1717
1718         DBF_EVENT(3, "3590 init\n");
1719         /* Register driver for 3590 tapes. */
1720         rc = ccw_driver_register(&tape_3590_driver);
1721         if (rc)
1722                 DBF_EVENT(3, "3590 init failed\n");
1723         else
1724                 DBF_EVENT(3, "3590 registered\n");
1725         return rc;
1726 }
1727
1728 static void
1729 tape_3590_exit(void)
1730 {
1731         ccw_driver_unregister(&tape_3590_driver);
1732
1733         debug_unregister(TAPE_DBF_AREA);
1734 }
1735
1736 MODULE_DEVICE_TABLE(ccw, tape_3590_ids);
1737 MODULE_AUTHOR("(C) 2001,2006 IBM Corporation");
1738 MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver");
1739 MODULE_LICENSE("GPL");
1740
1741 module_init(tape_3590_init);
1742 module_exit(tape_3590_exit);