drivers/s390/char/tape_3590.c

   1 /*
   2  *    tape device discipline for 3590 tapes.
   3  *
   4  *    Copyright IBM Corp. 2001, 2009
   5  *    Author(s): Stefan Bader <shbader@de.ibm.com>
   6  *               Michael Holzheu <holzheu@de.ibm.com>
   7  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  */
   9
  10 #define KMSG_COMPONENT "tape_3590"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/bio.h>
  17 #include <asm/ebcdic.h>
  18
  19 #define TAPE_DBF_AREA   tape_3590_dbf
  20 #define BUFSIZE 512     /* size of buffers for dynamic generated messages */
  21
  22 #include "tape.h"
  23 #include "tape_std.h"
  24 #include "tape_3590.h"
  25
  26 static struct workqueue_struct *tape_3590_wq;
  27
  28 /*
  29  * Pointer to debug area.
  30  */
  31 debug_info_t *TAPE_DBF_AREA = NULL;
  32 EXPORT_SYMBOL(TAPE_DBF_AREA);
  33
  34 /*******************************************************************
  35  * Error Recovery functions:
  36  * - Read Opposite:              implemented
  37  * - Read Device (buffered) log: BRA
  38  * - Read Library log:           BRA
  39  * - Swap Devices:               BRA
  40  * - Long Busy:                  implemented
  41  * - Special Intercept:          BRA
  42  * - Read Alternate:             implemented
  43  *******************************************************************/
  44
  45 static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = {
  46         [0x00] = "",
  47         [0x10] = "Lost Sense",
  48         [0x11] = "Assigned Elsewhere",
  49         [0x12] = "Allegiance Reset",
  50         [0x13] = "Shared Access Violation",
  51         [0x20] = "Command Reject",
  52         [0x21] = "Configuration Error",
  53         [0x22] = "Protection Exception",
  54         [0x23] = "Write Protect",
  55         [0x24] = "Write Length",
  56         [0x25] = "Read-Only Format",
  57         [0x31] = "Beginning of Partition",
  58         [0x33] = "End of Partition",
  59         [0x34] = "End of Data",
  60         [0x35] = "Block not found",
  61         [0x40] = "Device Intervention",
  62         [0x41] = "Loader Intervention",
  63         [0x42] = "Library Intervention",
  64         [0x50] = "Write Error",
  65         [0x51] = "Erase Error",
  66         [0x52] = "Formatting Error",
  67         [0x53] = "Read Error",
  68         [0x54] = "Unsupported Format",
  69         [0x55] = "No Formatting",
  70         [0x56] = "Positioning lost",
  71         [0x57] = "Read Length",
  72         [0x60] = "Unsupported Medium",
  73         [0x61] = "Medium Length Error",
  74         [0x62] = "Medium removed",
  75         [0x64] = "Load Check",
  76         [0x65] = "Unload Check",
  77         [0x70] = "Equipment Check",
  78         [0x71] = "Bus out Check",
  79         [0x72] = "Protocol Error",
  80         [0x73] = "Interface Error",
  81         [0x74] = "Overrun",
  82         [0x75] = "Halt Signal",
  83         [0x90] = "Device fenced",
  84         [0x91] = "Device Path fenced",
  85         [0xa0] = "Volume misplaced",
  86         [0xa1] = "Volume inaccessible",
  87         [0xa2] = "Volume in input",
  88         [0xa3] = "Volume ejected",
  89         [0xa4] = "All categories reserved",
  90         [0xa5] = "Duplicate Volume",
  91         [0xa6] = "Library Manager Offline",
  92         [0xa7] = "Library Output Station full",
  93         [0xa8] = "Vision System non-operational",
  94         [0xa9] = "Library Manager Equipment Check",
  95         [0xaa] = "Library Equipment Check",
  96         [0xab] = "All Library Cells full",
  97         [0xac] = "No Cleaner Volumes in Library",
  98         [0xad] = "I/O Station door open",
  99         [0xae] = "Subsystem environmental alert",
 100 };
 101
 102 static int crypt_supported(struct tape_device *device)
 103 {
 104         return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device));
 105 }
 106
 107 static int crypt_enabled(struct tape_device *device)
 108 {
 109         return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device));
 110 }
 111
 112 static void ext_to_int_kekl(struct tape390_kekl *in,
 113                             struct tape3592_kekl *out)
 114 {
 115         int i;
 116
 117         memset(out, 0, sizeof(*out));
 118         if (in->type == TAPE390_KEKL_TYPE_HASH)
 119                 out->flags |= 0x40;
 120         if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH)
 121                 out->flags |= 0x80;
 122         strncpy(out->label, in->label, 64);
 123         for (i = strlen(in->label); i < sizeof(out->label); i++)
 124                 out->label[i] = ' ';
 125         ASCEBC(out->label, sizeof(out->label));
 126 }
 127
 128 static void int_to_ext_kekl(struct tape3592_kekl *in,
 129                             struct tape390_kekl *out)
 130 {
 131         memset(out, 0, sizeof(*out));
 132         if(in->flags & 0x40)
 133                 out->type = TAPE390_KEKL_TYPE_HASH;
 134         else
 135                 out->type = TAPE390_KEKL_TYPE_LABEL;
 136         if(in->flags & 0x80)
 137                 out->type_on_tape = TAPE390_KEKL_TYPE_HASH;
 138         else
 139                 out->type_on_tape = TAPE390_KEKL_TYPE_LABEL;
 140         memcpy(out->label, in->label, sizeof(in->label));
 141         EBCASC(out->label, sizeof(in->label));
 142         strim(out->label);
 143 }
 144
 145 static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in,
 146                                  struct tape390_kekl_pair *out)
 147 {
 148         if (in->count == 0) {
 149                 out->kekl[0].type = TAPE390_KEKL_TYPE_NONE;
 150                 out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 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 == 1) {
 154                 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
 155                 out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
 156                 out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 157         } else if (in->count == 2) {
 158                 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
 159                 int_to_ext_kekl(&in->kekl[1], &out->kekl[1]);
 160         } else {
 161                 printk("Invalid KEKL number: %d\n", in->count);
 162                 BUG();
 163         }
 164 }
 165
 166 static int check_ext_kekl(struct tape390_kekl *kekl)
 167 {
 168         if (kekl->type == TAPE390_KEKL_TYPE_NONE)
 169                 goto invalid;
 170         if (kekl->type > TAPE390_KEKL_TYPE_HASH)
 171                 goto invalid;
 172         if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE)
 173                 goto invalid;
 174         if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH)
 175                 goto invalid;
 176         if ((kekl->type == TAPE390_KEKL_TYPE_HASH) &&
 177             (kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL))
 178                 goto invalid;
 179
 180         return 0;
 181 invalid:
 182         return -EINVAL;
 183 }
 184
 185 static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls)
 186 {
 187         if (check_ext_kekl(&kekls->kekl[0]))
 188                 goto invalid;
 189         if (check_ext_kekl(&kekls->kekl[1]))
 190                 goto invalid;
 191
 192         return 0;
 193 invalid:
 194         return -EINVAL;
 195 }
 196
 197 /*
 198  * Query KEKLs
 199  */
 200 static int tape_3592_kekl_query(struct tape_device *device,
 201                                 struct tape390_kekl_pair *ext_kekls)
 202 {
 203         struct tape_request *request;
 204         struct tape3592_kekl_query_order *order;
 205         struct tape3592_kekl_query_data *int_kekls;
 206         int rc;
 207
 208         DBF_EVENT(6, "tape3592_kekl_query\n");
 209         int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA);
 210         if (!int_kekls)
 211                 return -ENOMEM;
 212         request = tape_alloc_request(2, sizeof(*order));
 213         if (IS_ERR(request)) {
 214                 rc = PTR_ERR(request);
 215                 goto fail_malloc;
 216         }
 217         order = request->cpdata;
 218         memset(order,0,sizeof(*order));
 219         order->code = 0xe2;
 220         order->max_count = 2;
 221         request->op = TO_KEKL_QUERY;
 222         tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
 223         tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls),
 224                      int_kekls);
 225         rc = tape_do_io(device, request);
 226         if (rc)
 227                 goto fail_request;
 228         int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls);
 229
 230         rc = 0;
 231 fail_request:
 232         tape_free_request(request);
 233 fail_malloc:
 234         kfree(int_kekls);
 235         return rc;
 236 }
 237
 238 /*
 239  * IOCTL: Query KEKLs
 240  */
 241 static int tape_3592_ioctl_kekl_query(struct tape_device *device,
 242                                       unsigned long arg)
 243 {
 244         int rc;
 245         struct tape390_kekl_pair *ext_kekls;
 246
 247         DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n");
 248         if (!crypt_supported(device))
 249                 return -ENOSYS;
 250         if (!crypt_enabled(device))
 251                 return -EUNATCH;
 252         ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
 253         if (!ext_kekls)
 254                 return -ENOMEM;
 255         rc = tape_3592_kekl_query(device, ext_kekls);
 256         if (rc != 0)
 257                 goto fail;
 258         if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) {
 259                 rc = -EFAULT;
 260                 goto fail;
 261         }
 262         rc = 0;
 263 fail:
 264         kfree(ext_kekls);
 265         return rc;
 266 }
 267
 268 static int tape_3590_mttell(struct tape_device *device, int mt_count);
 269
 270 /*
 271  * Set KEKLs
 272  */
 273 static int tape_3592_kekl_set(struct tape_device *device,
 274                               struct tape390_kekl_pair *ext_kekls)
 275 {
 276         struct tape_request *request;
 277         struct tape3592_kekl_set_order *order;
 278
 279         DBF_EVENT(6, "tape3592_kekl_set\n");
 280         if (check_ext_kekl_pair(ext_kekls)) {
 281                 DBF_EVENT(6, "invalid kekls\n");
 282                 return -EINVAL;
 283         }
 284         if (tape_3590_mttell(device, 0) != 0)
 285                 return -EBADSLT;
 286         request = tape_alloc_request(1, sizeof(*order));
 287         if (IS_ERR(request))
 288                 return PTR_ERR(request);
 289         order = request->cpdata;
 290         memset(order, 0, sizeof(*order));
 291         order->code = 0xe3;
 292         order->kekls.count = 2;
 293         ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]);
 294         ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]);
 295         request->op = TO_KEKL_SET;
 296         tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
 297
 298         return tape_do_io_free(device, request);
 299 }
 300
 301 /*
 302  * IOCTL: Set KEKLs
 303  */
 304 static int tape_3592_ioctl_kekl_set(struct tape_device *device,
 305                                     unsigned long arg)
 306 {
 307         int rc;
 308         struct tape390_kekl_pair *ext_kekls;
 309
 310         DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n");
 311         if (!crypt_supported(device))
 312                 return -ENOSYS;
 313         if (!crypt_enabled(device))
 314                 return -EUNATCH;
 315         ext_kekls = memdup_user((char __user *)arg, sizeof(*ext_kekls));
 316         if (IS_ERR(ext_kekls))
 317                 return PTR_ERR(ext_kekls);
 318         rc = tape_3592_kekl_set(device, ext_kekls);
 319         kfree(ext_kekls);
 320         return rc;
 321 }
 322
 323 /*
 324  * Enable encryption
 325  */
 326 static struct tape_request *__tape_3592_enable_crypt(struct tape_device *device)
 327 {
 328         struct tape_request *request;
 329         char *data;
 330
 331         DBF_EVENT(6, "tape_3592_enable_crypt\n");
 332         if (!crypt_supported(device))
 333                 return ERR_PTR(-ENOSYS);
 334         request = tape_alloc_request(2, 72);
 335         if (IS_ERR(request))
 336                 return request;
 337         data = request->cpdata;
 338         memset(data,0,72);
 339
 340         data[0]       = 0x05;
 341         data[36 + 0]  = 0x03;
 342         data[36 + 1]  = 0x03;
 343         data[36 + 4]  = 0x40;
 344         data[36 + 6]  = 0x01;
 345         data[36 + 14] = 0x2f;
 346         data[36 + 18] = 0xc3;
 347         data[36 + 35] = 0x72;
 348         request->op = TO_CRYPT_ON;
 349         tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
 350         tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
 351         return request;
 352 }
 353
 354 static int tape_3592_enable_crypt(struct tape_device *device)
 355 {
 356         struct tape_request *request;
 357
 358         request = __tape_3592_enable_crypt(device);
 359         if (IS_ERR(request))
 360                 return PTR_ERR(request);
 361         return tape_do_io_free(device, request);
 362 }
 363
 364 static void tape_3592_enable_crypt_async(struct tape_device *device)
 365 {
 366         struct tape_request *request;
 367
 368         request = __tape_3592_enable_crypt(device);
 369         if (!IS_ERR(request))
 370                 tape_do_io_async_free(device, request);
 371 }
 372
 373 /*
 374  * Disable encryption
 375  */
 376 static struct tape_request *__tape_3592_disable_crypt(struct tape_device *device)
 377 {
 378         struct tape_request *request;
 379         char *data;
 380
 381         DBF_EVENT(6, "tape_3592_disable_crypt\n");
 382         if (!crypt_supported(device))
 383                 return ERR_PTR(-ENOSYS);
 384         request = tape_alloc_request(2, 72);
 385         if (IS_ERR(request))
 386                 return request;
 387         data = request->cpdata;
 388         memset(data,0,72);
 389
 390         data[0]       = 0x05;
 391         data[36 + 0]  = 0x03;
 392         data[36 + 1]  = 0x03;
 393         data[36 + 35] = 0x32;
 394
 395         request->op = TO_CRYPT_OFF;
 396         tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
 397         tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
 398
 399         return request;
 400 }
 401
 402 static int tape_3592_disable_crypt(struct tape_device *device)
 403 {
 404         struct tape_request *request;
 405
 406         request = __tape_3592_disable_crypt(device);
 407         if (IS_ERR(request))
 408                 return PTR_ERR(request);
 409         return tape_do_io_free(device, request);
 410 }
 411
 412 static void tape_3592_disable_crypt_async(struct tape_device *device)
 413 {
 414         struct tape_request *request;
 415
 416         request = __tape_3592_disable_crypt(device);
 417         if (!IS_ERR(request))
 418                 tape_do_io_async_free(device, request);
 419 }
 420
 421 /*
 422  * IOCTL: Set encryption status
 423  */
 424 static int tape_3592_ioctl_crypt_set(struct tape_device *device,
 425                                      unsigned long arg)
 426 {
 427         struct tape390_crypt_info info;
 428
 429         DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n");
 430         if (!crypt_supported(device))
 431                 return -ENOSYS;
 432         if (copy_from_user(&info, (char __user *)arg, sizeof(info)))
 433                 return -EFAULT;
 434         if (info.status & ~TAPE390_CRYPT_ON_MASK)
 435                 return -EINVAL;
 436         if (info.status & TAPE390_CRYPT_ON_MASK)
 437                 return tape_3592_enable_crypt(device);
 438         else
 439                 return tape_3592_disable_crypt(device);
 440 }
 441
 442 static int tape_3590_sense_medium(struct tape_device *device);
 443
 444 /*
 445  * IOCTL: Query enryption status
 446  */
 447 static int tape_3592_ioctl_crypt_query(struct tape_device *device,
 448                                        unsigned long arg)
 449 {
 450         DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n");
 451         if (!crypt_supported(device))
 452                 return -ENOSYS;
 453         tape_3590_sense_medium(device);
 454         if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device),
 455                 sizeof(TAPE_3590_CRYPT_INFO(device))))
 456                 return -EFAULT;
 457         else
 458                 return 0;
 459 }
 460
 461 /*
 462  * 3590 IOCTL Overload
 463  */
 464 static int
 465 tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
 466 {
 467         switch (cmd) {
 468         case TAPE390_DISPLAY: {
 469                 struct display_struct disp;
 470
 471                 if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)))
 472                         return -EFAULT;
 473
 474                 return tape_std_display(device, &disp);
 475         }
 476         case TAPE390_KEKL_SET:
 477                 return tape_3592_ioctl_kekl_set(device, arg);
 478         case TAPE390_KEKL_QUERY:
 479                 return tape_3592_ioctl_kekl_query(device, arg);
 480         case TAPE390_CRYPT_SET:
 481                 return tape_3592_ioctl_crypt_set(device, arg);
 482         case TAPE390_CRYPT_QUERY:
 483                 return tape_3592_ioctl_crypt_query(device, arg);
 484         default:
 485                 return -EINVAL; /* no additional ioctls */
 486         }
 487 }
 488
 489 /*
 490  * SENSE Medium: Get Sense data about medium state
 491  */
 492 static int tape_3590_sense_medium(struct tape_device *device)
 493 {
 494         struct tape_request *request;
 495
 496         request = tape_alloc_request(1, 128);
 497         if (IS_ERR(request))
 498                 return PTR_ERR(request);
 499         request->op = TO_MSEN;
 500         tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
 501         return tape_do_io_free(device, request);
 502 }
 503
 504 static void tape_3590_sense_medium_async(struct tape_device *device)
 505 {
 506         struct tape_request *request;
 507
 508         request = tape_alloc_request(1, 128);
 509         if (IS_ERR(request))
 510                 return;
 511         request->op = TO_MSEN;
 512         tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
 513         tape_do_io_async_free(device, request);
 514 }
 515
 516 /*
 517  * MTTELL: Tell block. Return the number of block relative to current file.
 518  */
 519 static int
 520 tape_3590_mttell(struct tape_device *device, int mt_count)
 521 {
 522         __u64 block_id;
 523         int rc;
 524
 525         rc = tape_std_read_block_id(device, &block_id);
 526         if (rc)
 527                 return rc;
 528         return block_id >> 32;
 529 }
 530
 531 /*
 532  * MTSEEK: seek to the specified block.
 533  */
 534 static int
 535 tape_3590_mtseek(struct tape_device *device, int count)
 536 {
 537         struct tape_request *request;
 538
 539         DBF_EVENT(6, "xsee id: %x\n", count);
 540         request = tape_alloc_request(3, 4);
 541         if (IS_ERR(request))
 542                 return PTR_ERR(request);
 543         request->op = TO_LBL;
 544         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
 545         *(__u32 *) request->cpdata = count;
 546         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
 547         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
 548         return tape_do_io_free(device, request);
 549 }
 550
 551 /*
 552  * Read Opposite Error Recovery Function:
 553  * Used, when Read Forward does not work
 554  */
 555 static void
 556 tape_3590_read_opposite(struct tape_device *device,
 557                         struct tape_request *request)
 558 {
 559         struct tape_3590_disc_data *data;
 560
 561         /*
 562          * We have allocated 4 ccws in tape_std_read, so we can now
 563          * transform the request to a read backward, followed by a
 564          * forward space block.
 565          */
 566         request->op = TO_RBA;
 567         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
 568         data = device->discdata;
 569         tape_ccw_cc_idal(request->cpaddr + 1, data->read_back_op,
 570                          device->char_data.idal_buf);
 571         tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL);
 572         tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL);
 573         DBF_EVENT(6, "xrop ccwg\n");
 574 }
 575
 576 /*
 577  * Read Attention Msg
 578  * This should be done after an interrupt with attention bit (0x80)
 579  * in device state.
 580  *
 581  * After a "read attention message" request there are two possible
 582  * results:
 583  *
 584  * 1. A unit check is presented, when attention sense is present (e.g. when
 585  * a medium has been unloaded). The attention sense comes then
 586  * together with the unit check. The recovery action is either "retry"
 587  * (in case there is an attention message pending) or "permanent error".
 588  *
 589  * 2. The attention msg is written to the "read subsystem data" buffer.
 590  * In this case we probably should print it to the console.
 591  */
 592 static void tape_3590_read_attmsg_async(struct tape_device *device)
 593 {
 594         struct tape_request *request;
 595         char *buf;
 596
 597         request = tape_alloc_request(3, 4096);
 598         if (IS_ERR(request))
 599                 return;
 600         request->op = TO_READ_ATTMSG;
 601         buf = request->cpdata;
 602         buf[0] = PREP_RD_SS_DATA;
 603         buf[6] = RD_ATTMSG;     /* read att msg */
 604         tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf);
 605         tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12);
 606         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
 607         tape_do_io_async_free(device, request);
 608 }
 609
 610 /*
 611  * These functions are used to schedule follow-up actions from within an
 612  * interrupt context (like unsolicited interrupts).
 613  * Note: the work handler is called by the system work queue. The tape
 614  * commands started by the handler need to be asynchrounous, otherwise
 615  * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq).
 616  */
 617 struct work_handler_data {
 618         struct tape_device *device;
 619         enum tape_op        op;
 620         struct work_struct  work;
 621 };
 622
 623 static void
 624 tape_3590_work_handler(struct work_struct *work)
 625 {
 626         struct work_handler_data *p =
 627                 container_of(work, struct work_handler_data, work);
 628
 629         switch (p->op) {
 630         case TO_MSEN:
 631                 tape_3590_sense_medium_async(p->device);
 632                 break;
 633         case TO_READ_ATTMSG:
 634                 tape_3590_read_attmsg_async(p->device);
 635                 break;
 636         case TO_CRYPT_ON:
 637                 tape_3592_enable_crypt_async(p->device);
 638                 break;
 639         case TO_CRYPT_OFF:
 640                 tape_3592_disable_crypt_async(p->device);
 641                 break;
 642         default:
 643                 DBF_EVENT(3, "T3590: work handler undefined for "
 644                           "operation 0x%02x\n", p->op);
 645         }
 646         tape_put_device(p->device);
 647         kfree(p);
 648 }
 649
 650 static int
 651 tape_3590_schedule_work(struct tape_device *device, enum tape_op op)
 652 {
 653         struct work_handler_data *p;
 654
 655         if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
 656                 return -ENOMEM;
 657
 658         INIT_WORK(&p->work, tape_3590_work_handler);
 659
 660         p->device = tape_get_device(device);
 661         p->op = op;
 662
 663         queue_work(tape_3590_wq, &p->work);
 664         return 0;
 665 }
 666
 667 static void tape_3590_med_state_set(struct tape_device *device,
 668                                     struct tape_3590_med_sense *sense)
 669 {
 670         struct tape390_crypt_info *c_info;
 671
 672         c_info = &TAPE_3590_CRYPT_INFO(device);
 673
 674         DBF_EVENT(6, "medium state: %x:%x\n", sense->macst, sense->masst);
 675         switch (sense->macst) {
 676         case 0x04:
 677         case 0x05:
 678         case 0x06:
 679                 tape_med_state_set(device, MS_UNLOADED);
 680                 TAPE_3590_CRYPT_INFO(device).medium_status = 0;
 681                 return;
 682         case 0x08:
 683         case 0x09:
 684                 tape_med_state_set(device, MS_LOADED);
 685                 break;
 686         default:
 687                 tape_med_state_set(device, MS_UNKNOWN);
 688                 return;
 689         }
 690         c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
 691         if (sense->flags & MSENSE_CRYPT_MASK) {
 692                 DBF_EVENT(6, "Medium is encrypted (%04x)\n", sense->flags);
 693                 c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
 694         } else  {
 695                 DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
 696                 c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
 697         }
 698 }
 699
 700 /*
 701  * The done handler is called at device/channel end and wakes up the sleeping
 702  * process
 703  */
 704 static int
 705 tape_3590_done(struct tape_device *device, struct tape_request *request)
 706 {
 707
 708         DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
 709
 710         switch (request->op) {
 711         case TO_BSB:
 712         case TO_BSF:
 713         case TO_DSE:
 714         case TO_FSB:
 715         case TO_FSF:
 716         case TO_LBL:
 717         case TO_RFO:
 718         case TO_RBA:
 719         case TO_REW:
 720         case TO_WRI:
 721         case TO_WTM:
 722         case TO_BLOCK:
 723         case TO_LOAD:
 724                 tape_med_state_set(device, MS_LOADED);
 725                 break;
 726         case TO_RUN:
 727                 tape_med_state_set(device, MS_UNLOADED);
 728                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
 729                 break;
 730         case TO_MSEN:
 731                 tape_3590_med_state_set(device, request->cpdata);
 732                 break;
 733         case TO_CRYPT_ON:
 734                 TAPE_3590_CRYPT_INFO(device).status
 735                         |= TAPE390_CRYPT_ON_MASK;
 736                 *(device->modeset_byte) |= 0x03;
 737                 break;
 738         case TO_CRYPT_OFF:
 739                 TAPE_3590_CRYPT_INFO(device).status
 740                         &= ~TAPE390_CRYPT_ON_MASK;
 741                 *(device->modeset_byte) &= ~0x03;
 742                 break;
 743         case TO_RBI:    /* RBI seems to succeed even without medium loaded. */
 744         case TO_NOP:    /* Same to NOP. */
 745         case TO_READ_CONFIG:
 746         case TO_READ_ATTMSG:
 747         case TO_DIS:
 748         case TO_ASSIGN:
 749         case TO_UNASSIGN:
 750         case TO_SIZE:
 751         case TO_KEKL_SET:
 752         case TO_KEKL_QUERY:
 753         case TO_RDC:
 754                 break;
 755         }
 756         return TAPE_IO_SUCCESS;
 757 }
 758
 759 /*
 760  * This function is called, when error recovery was successful
 761  */
 762 static inline int
 763 tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request)
 764 {
 765         DBF_EVENT(3, "Error Recovery successful for %s\n",
 766                   tape_op_verbose[request->op]);
 767         return tape_3590_done(device, request);
 768 }
 769
 770 /*
 771  * This function is called, when error recovery was not successful
 772  */
 773 static inline int
 774 tape_3590_erp_failed(struct tape_device *device, struct tape_request *request,
 775                      struct irb *irb, int rc)
 776 {
 777         DBF_EVENT(3, "Error Recovery failed for %s\n",
 778                   tape_op_verbose[request->op]);
 779         tape_dump_sense_dbf(device, request, irb);
 780         return rc;
 781 }
 782
 783 /*
 784  * Error Recovery do retry
 785  */
 786 static inline int
 787 tape_3590_erp_retry(struct tape_device *device, struct tape_request *request,
 788                     struct irb *irb)
 789 {
 790         DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]);
 791         tape_dump_sense_dbf(device, request, irb);
 792         return TAPE_IO_RETRY;
 793 }
 794
 795 /*
 796  * Handle unsolicited interrupts
 797  */
 798 static int
 799 tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb)
 800 {
 801         if (irb->scsw.cmd.dstat == DEV_STAT_CHN_END)
 802                 /* Probably result of halt ssch */
 803                 return TAPE_IO_PENDING;
 804         else if (irb->scsw.cmd.dstat == 0x85)
 805                 /* Device Ready */
 806                 DBF_EVENT(3, "unsol.irq! tape ready: %08x\n", device->cdev_id);
 807         else if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 808                 tape_3590_schedule_work(device, TO_READ_ATTMSG);
 809         } else {
 810                 DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
 811                 tape_dump_sense_dbf(device, NULL, irb);
 812         }
 813         /* check medium state */
 814         tape_3590_schedule_work(device, TO_MSEN);
 815         return TAPE_IO_SUCCESS;
 816 }
 817
 818 /*
 819  * Basic Recovery routine
 820  */
 821 static int
 822 tape_3590_erp_basic(struct tape_device *device, struct tape_request *request,
 823                     struct irb *irb, int rc)
 824 {
 825         struct tape_3590_sense *sense;
 826
 827         sense = (struct tape_3590_sense *) irb->ecw;
 828
 829         switch (sense->bra) {
 830         case SENSE_BRA_PER:
 831                 return tape_3590_erp_failed(device, request, irb, rc);
 832         case SENSE_BRA_CONT:
 833                 return tape_3590_erp_succeded(device, request);
 834         case SENSE_BRA_RE:
 835                 return tape_3590_erp_retry(device, request, irb);
 836         case SENSE_BRA_DRE:
 837                 return tape_3590_erp_failed(device, request, irb, rc);
 838         default:
 839                 BUG();
 840                 return TAPE_IO_STOP;
 841         }
 842 }
 843
 844 /*
 845  *  RDL: Read Device (buffered) log
 846  */
 847 static int
 848 tape_3590_erp_read_buf_log(struct tape_device *device,
 849                            struct tape_request *request, struct irb *irb)
 850 {
 851         /*
 852          * We just do the basic error recovery at the moment (retry).
 853          * Perhaps in the future, we read the log and dump it somewhere...
 854          */
 855         return tape_3590_erp_basic(device, request, irb, -EIO);
 856 }
 857
 858 /*
 859  *  SWAP: Swap Devices
 860  */
 861 static int
 862 tape_3590_erp_swap(struct tape_device *device, struct tape_request *request,
 863                    struct irb *irb)
 864 {
 865         /*
 866          * This error recovery should swap the tapes
 867          * if the original has a problem. The operation
 868          * should proceed with the new tape... this
 869          * should probably be done in user space!
 870          */
 871         dev_warn (&device->cdev->dev, "The tape medium must be loaded into a "
 872                 "different tape unit\n");
 873         return tape_3590_erp_basic(device, request, irb, -EIO);
 874 }
 875
 876 /*
 877  *  LBY: Long Busy
 878  */
 879 static int
 880 tape_3590_erp_long_busy(struct tape_device *device,
 881                         struct tape_request *request, struct irb *irb)
 882 {
 883         DBF_EVENT(6, "Device is busy\n");
 884         return TAPE_IO_LONG_BUSY;
 885 }
 886
 887 /*
 888  *  SPI: Special Intercept
 889  */
 890 static int
 891 tape_3590_erp_special_interrupt(struct tape_device *device,
 892                                 struct tape_request *request, struct irb *irb)
 893 {
 894         return tape_3590_erp_basic(device, request, irb, -EIO);
 895 }
 896
 897 /*
 898  *  RDA: Read Alternate
 899  */
 900 static int
 901 tape_3590_erp_read_alternate(struct tape_device *device,
 902                              struct tape_request *request, struct irb *irb)
 903 {
 904         struct tape_3590_disc_data *data;
 905
 906         /*
 907          * The issued Read Backward or Read Previous command is not
 908          * supported by the device
 909          * The recovery action should be to issue another command:
 910          * Read Revious: if Read Backward is not supported
 911          * Read Backward: if Read Previous is not supported
 912          */
 913         data = device->discdata;
 914         if (data->read_back_op == READ_PREVIOUS) {
 915                 DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n",
 916                           device->cdev_id);
 917                 data->read_back_op = READ_BACKWARD;
 918         } else {
 919                 DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n",
 920                           device->cdev_id);
 921                 data->read_back_op = READ_PREVIOUS;
 922         }
 923         tape_3590_read_opposite(device, request);
 924         return tape_3590_erp_retry(device, request, irb);
 925 }
 926
 927 /*
 928  * Error Recovery read opposite
 929  */
 930 static int
 931 tape_3590_erp_read_opposite(struct tape_device *device,
 932                             struct tape_request *request, struct irb *irb)
 933 {
 934         switch (request->op) {
 935         case TO_RFO:
 936                 /*
 937                  * We did read forward, but the data could not be read.
 938                  * We will read backward and then skip forward again.
 939                  */
 940                 tape_3590_read_opposite(device, request);
 941                 return tape_3590_erp_retry(device, request, irb);
 942         case TO_RBA:
 943                 /* We tried to read forward and backward, but hat no success */
 944                 return tape_3590_erp_failed(device, request, irb, -EIO);
 945                 break;
 946         default:
 947                 return tape_3590_erp_failed(device, request, irb, -EIO);
 948         }
 949 }
 950
 951 /*
 952  * Print an MIM (Media Information  Message) (message code f0)
 953  */
 954 static void
 955 tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb)
 956 {
 957         struct tape_3590_sense *sense;
 958         char *exception, *service;
 959
 960         exception = kmalloc(BUFSIZE, GFP_ATOMIC);
 961         service = kmalloc(BUFSIZE, GFP_ATOMIC);
 962
 963         if (!exception || !service)
 964                 goto out_nomem;
 965
 966         sense = (struct tape_3590_sense *) irb->ecw;
 967         /* Exception Message */
 968         switch (sense->fmt.f70.emc) {
 969         case 0x02:
 970                 snprintf(exception, BUFSIZE, "Data degraded");
 971                 break;
 972         case 0x03:
 973                 snprintf(exception, BUFSIZE, "Data degraded in partion %i",
 974                         sense->fmt.f70.mp);
 975                 break;
 976         case 0x04:
 977                 snprintf(exception, BUFSIZE, "Medium degraded");
 978                 break;
 979         case 0x05:
 980                 snprintf(exception, BUFSIZE, "Medium degraded in partition %i",
 981                         sense->fmt.f70.mp);
 982                 break;
 983         case 0x06:
 984                 snprintf(exception, BUFSIZE, "Block 0 Error");
 985                 break;
 986         case 0x07:
 987                 snprintf(exception, BUFSIZE, "Medium Exception 0x%02x",
 988                         sense->fmt.f70.md);
 989                 break;
 990         default:
 991                 snprintf(exception, BUFSIZE, "0x%02x",
 992                         sense->fmt.f70.emc);
 993                 break;
 994         }
 995         /* Service Message */
 996         switch (sense->fmt.f70.smc) {
 997         case 0x02:
 998                 snprintf(service, BUFSIZE, "Reference Media maintenance "
 999                         "procedure %i", sense->fmt.f70.md);
1000                 break;
1001         default:
1002                 snprintf(service, BUFSIZE, "0x%02x",
1003                         sense->fmt.f70.smc);
1004                 break;
1005         }
1006
1007         dev_warn (&device->cdev->dev, "Tape media information: exception %s, "
1008                 "service %s\n", exception, service);
1009
1010 out_nomem:
1011         kfree(exception);
1012         kfree(service);
1013 }
1014
1015 /*
1016  * Print an I/O Subsystem Service Information Message (message code f1)
1017  */
1018 static void
1019 tape_3590_print_io_sim_msg_f1(struct tape_device *device, struct irb *irb)
1020 {
1021         struct tape_3590_sense *sense;
1022         char *exception, *service;
1023
1024         exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1025         service = kmalloc(BUFSIZE, GFP_ATOMIC);
1026
1027         if (!exception || !service)
1028                 goto out_nomem;
1029
1030         sense = (struct tape_3590_sense *) irb->ecw;
1031         /* Exception Message */
1032         switch (sense->fmt.f71.emc) {
1033         case 0x01:
1034                 snprintf(exception, BUFSIZE, "Effect of failure is unknown");
1035                 break;
1036         case 0x02:
1037                 snprintf(exception, BUFSIZE, "CU Exception - no performance "
1038                         "impact");
1039                 break;
1040         case 0x03:
1041                 snprintf(exception, BUFSIZE, "CU Exception on channel "
1042                         "interface 0x%02x", sense->fmt.f71.md[0]);
1043                 break;
1044         case 0x04:
1045                 snprintf(exception, BUFSIZE, "CU Exception on device path "
1046                         "0x%02x", sense->fmt.f71.md[0]);
1047                 break;
1048         case 0x05:
1049                 snprintf(exception, BUFSIZE, "CU Exception on library path "
1050                         "0x%02x", sense->fmt.f71.md[0]);
1051                 break;
1052         case 0x06:
1053                 snprintf(exception, BUFSIZE, "CU Exception on node 0x%02x",
1054                         sense->fmt.f71.md[0]);
1055                 break;
1056         case 0x07:
1057                 snprintf(exception, BUFSIZE, "CU Exception on partition "
1058                         "0x%02x", sense->fmt.f71.md[0]);
1059                 break;
1060         default:
1061                 snprintf(exception, BUFSIZE, "0x%02x",
1062                         sense->fmt.f71.emc);
1063         }
1064         /* Service Message */
1065         switch (sense->fmt.f71.smc) {
1066         case 0x01:
1067                 snprintf(service, BUFSIZE, "Repair impact is unknown");
1068                 break;
1069         case 0x02:
1070                 snprintf(service, BUFSIZE, "Repair will not impact cu "
1071                         "performance");
1072                 break;
1073         case 0x03:
1074                 if (sense->fmt.f71.mdf == 0)
1075                         snprintf(service, BUFSIZE, "Repair will disable node "
1076                                 "0x%x on CU", sense->fmt.f71.md[1]);
1077                 else
1078                         snprintf(service, BUFSIZE, "Repair will disable "
1079                                 "nodes (0x%x-0x%x) on CU", sense->fmt.f71.md[1],
1080                                 sense->fmt.f71.md[2]);
1081                 break;
1082         case 0x04:
1083                 if (sense->fmt.f71.mdf == 0)
1084                         snprintf(service, BUFSIZE, "Repair will disable "
1085                                 "channel path 0x%x on CU",
1086                                 sense->fmt.f71.md[1]);
1087                 else
1088                         snprintf(service, BUFSIZE, "Repair will disable channel"
1089                                 " paths (0x%x-0x%x) on CU",
1090                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1091                 break;
1092         case 0x05:
1093                 if (sense->fmt.f71.mdf == 0)
1094                         snprintf(service, BUFSIZE, "Repair will disable device"
1095                                 " path 0x%x on CU", sense->fmt.f71.md[1]);
1096                 else
1097                         snprintf(service, BUFSIZE, "Repair will disable device"
1098                                 " paths (0x%x-0x%x) on CU",
1099                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1100                 break;
1101         case 0x06:
1102                 if (sense->fmt.f71.mdf == 0)
1103                         snprintf(service, BUFSIZE, "Repair will disable "
1104                                 "library path 0x%x on CU",
1105                                 sense->fmt.f71.md[1]);
1106                 else
1107                         snprintf(service, BUFSIZE, "Repair will disable "
1108                                 "library paths (0x%x-0x%x) on CU",
1109                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1110                 break;
1111         case 0x07:
1112                 snprintf(service, BUFSIZE, "Repair will disable access to CU");
1113                 break;
1114         default:
1115                 snprintf(service, BUFSIZE, "0x%02x",
1116                         sense->fmt.f71.smc);
1117         }
1118
1119         dev_warn (&device->cdev->dev, "I/O subsystem information: exception"
1120                 " %s, service %s\n", exception, service);
1121 out_nomem:
1122         kfree(exception);
1123         kfree(service);
1124 }
1125
1126 /*
1127  * Print an Device Subsystem Service Information Message (message code f2)
1128  */
1129 static void
1130 tape_3590_print_dev_sim_msg_f2(struct tape_device *device, struct irb *irb)
1131 {
1132         struct tape_3590_sense *sense;
1133         char *exception, *service;
1134
1135         exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1136         service = kmalloc(BUFSIZE, GFP_ATOMIC);
1137
1138         if (!exception || !service)
1139                 goto out_nomem;
1140
1141         sense = (struct tape_3590_sense *) irb->ecw;
1142         /* Exception Message */
1143         switch (sense->fmt.f71.emc) {
1144         case 0x01:
1145                 snprintf(exception, BUFSIZE, "Effect of failure is unknown");
1146                 break;
1147         case 0x02:
1148                 snprintf(exception, BUFSIZE, "DV Exception - no performance"
1149                         " impact");
1150                 break;
1151         case 0x03:
1152                 snprintf(exception, BUFSIZE, "DV Exception on channel "
1153                         "interface 0x%02x", sense->fmt.f71.md[0]);
1154                 break;
1155         case 0x04:
1156                 snprintf(exception, BUFSIZE, "DV Exception on loader 0x%02x",
1157                         sense->fmt.f71.md[0]);
1158                 break;
1159         case 0x05:
1160                 snprintf(exception, BUFSIZE, "DV Exception on message display"
1161                         " 0x%02x", sense->fmt.f71.md[0]);
1162                 break;
1163         case 0x06:
1164                 snprintf(exception, BUFSIZE, "DV Exception in tape path");
1165                 break;
1166         case 0x07:
1167                 snprintf(exception, BUFSIZE, "DV Exception in drive");
1168                 break;
1169         default:
1170                 snprintf(exception, BUFSIZE, "0x%02x",
1171                         sense->fmt.f71.emc);
1172         }
1173         /* Service Message */
1174         switch (sense->fmt.f71.smc) {
1175         case 0x01:
1176                 snprintf(service, BUFSIZE, "Repair impact is unknown");
1177                 break;
1178         case 0x02:
1179                 snprintf(service, BUFSIZE, "Repair will not impact device "
1180                         "performance");
1181                 break;
1182         case 0x03:
1183                 if (sense->fmt.f71.mdf == 0)
1184                         snprintf(service, BUFSIZE, "Repair will disable "
1185                                 "channel path 0x%x on DV",
1186                                 sense->fmt.f71.md[1]);
1187                 else
1188                         snprintf(service, BUFSIZE, "Repair will disable "
1189                                 "channel path (0x%x-0x%x) on DV",
1190                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1191                 break;
1192         case 0x04:
1193                 if (sense->fmt.f71.mdf == 0)
1194                         snprintf(service, BUFSIZE, "Repair will disable "
1195                                 "interface 0x%x on DV", sense->fmt.f71.md[1]);
1196                 else
1197                         snprintf(service, BUFSIZE, "Repair will disable "
1198                                 "interfaces (0x%x-0x%x) on DV",
1199                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1200                 break;
1201         case 0x05:
1202                 if (sense->fmt.f71.mdf == 0)
1203                         snprintf(service, BUFSIZE, "Repair will disable loader"
1204                                 " 0x%x on DV", sense->fmt.f71.md[1]);
1205                 else
1206                         snprintf(service, BUFSIZE, "Repair will disable loader"
1207                                 " (0x%x-0x%x) on DV",
1208                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1209                 break;
1210         case 0x07:
1211                 snprintf(service, BUFSIZE, "Repair will disable access to DV");
1212                 break;
1213         case 0x08:
1214                 if (sense->fmt.f71.mdf == 0)
1215                         snprintf(service, BUFSIZE, "Repair will disable "
1216                                 "message display 0x%x on DV",
1217                                 sense->fmt.f71.md[1]);
1218                 else
1219                         snprintf(service, BUFSIZE, "Repair will disable "
1220                                 "message displays (0x%x-0x%x) on DV",
1221                                  sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1222                 break;
1223         case 0x09:
1224                 snprintf(service, BUFSIZE, "Clean DV");
1225                 break;
1226         default:
1227                 snprintf(service, BUFSIZE, "0x%02x",
1228                         sense->fmt.f71.smc);
1229         }
1230
1231         dev_warn (&device->cdev->dev, "Device subsystem information: exception"
1232                 " %s, service %s\n", exception, service);
1233 out_nomem:
1234         kfree(exception);
1235         kfree(service);
1236 }
1237
1238 /*
1239  * Print standard ERA Message
1240  */
1241 static void
1242 tape_3590_print_era_msg(struct tape_device *device, struct irb *irb)
1243 {
1244         struct tape_3590_sense *sense;
1245
1246         sense = (struct tape_3590_sense *) irb->ecw;
1247         if (sense->mc == 0)
1248                 return;
1249         if ((sense->mc > 0) && (sense->mc < TAPE_3590_MAX_MSG)) {
1250                 if (tape_3590_msg[sense->mc] != NULL)
1251                         dev_warn (&device->cdev->dev, "The tape unit has "
1252                                 "issued sense message %s\n",
1253                                 tape_3590_msg[sense->mc]);
1254                 else
1255                         dev_warn (&device->cdev->dev, "The tape unit has "
1256                                 "issued an unknown sense message code 0x%x\n",
1257                                 sense->mc);
1258                 return;
1259         }
1260         if (sense->mc == 0xf0) {
1261                 /* Standard Media Information Message */
1262                 dev_warn (&device->cdev->dev, "MIM SEV=%i, MC=%02x, ES=%x/%x, "
1263                         "RC=%02x-%04x-%02x\n", sense->fmt.f70.sev, sense->mc,
1264                         sense->fmt.f70.emc, sense->fmt.f70.smc,
1265                         sense->fmt.f70.refcode, sense->fmt.f70.mid,
1266                         sense->fmt.f70.fid);
1267                 tape_3590_print_mim_msg_f0(device, irb);
1268                 return;
1269         }
1270         if (sense->mc == 0xf1) {
1271                 /* Standard I/O Subsystem Service Information Message */
1272                 dev_warn (&device->cdev->dev, "IOSIM SEV=%i, DEVTYPE=3590/%02x,"
1273                         " MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1274                         sense->fmt.f71.sev, device->cdev->id.dev_model,
1275                         sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
1276                         sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
1277                         sense->fmt.f71.refcode3);
1278                 tape_3590_print_io_sim_msg_f1(device, irb);
1279                 return;
1280         }
1281         if (sense->mc == 0xf2) {
1282                 /* Standard Device Service Information Message */
1283                 dev_warn (&device->cdev->dev, "DEVSIM SEV=%i, DEVTYPE=3590/%02x"
1284                         ", MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1285                         sense->fmt.f71.sev, device->cdev->id.dev_model,
1286                         sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
1287                         sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
1288                         sense->fmt.f71.refcode3);
1289                 tape_3590_print_dev_sim_msg_f2(device, irb);
1290                 return;
1291         }
1292         if (sense->mc == 0xf3) {
1293                 /* Standard Library Service Information Message */
1294                 return;
1295         }
1296         dev_warn (&device->cdev->dev, "The tape unit has issued an unknown "
1297                 "sense message code %x\n", sense->mc);
1298 }
1299
1300 static int tape_3590_crypt_error(struct tape_device *device,
1301                                  struct tape_request *request, struct irb *irb)
1302 {
1303         u8 cu_rc;
1304         u16 ekm_rc2;
1305         char *sense;
1306
1307         sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
1308         cu_rc = sense[0];
1309         ekm_rc2 = *((u16*) &sense[10]);
1310         if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
1311                 /* key not defined on EKM */
1312                 return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
1313         if ((cu_rc == 1) || (cu_rc == 2))
1314                 /* No connection to EKM */
1315                 return tape_3590_erp_basic(device, request, irb, -ENOTCONN);
1316
1317         dev_err (&device->cdev->dev, "The tape unit failed to obtain the "
1318                 "encryption key from EKM\n");
1319
1320         return tape_3590_erp_basic(device, request, irb, -ENOKEY);
1321 }
1322
1323 /*
1324  *  3590 error Recovery routine:
1325  *  If possible, it tries to recover from the error. If this is not possible,
1326  *  inform the user about the problem.
1327  */
1328 static int
1329 tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
1330                      struct irb *irb)
1331 {
1332         struct tape_3590_sense *sense;
1333
1334         sense = (struct tape_3590_sense *) irb->ecw;
1335
1336         DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);
1337
1338         /*
1339          * First check all RC-QRCs where we want to do something special
1340          *   - "break":     basic error recovery is done
1341          *   - "goto out:": just print error message if available
1342          */
1343         switch (sense->rc_rqc) {
1344
1345         case 0x1110:
1346                 tape_3590_print_era_msg(device, irb);
1347                 return tape_3590_erp_read_buf_log(device, request, irb);
1348
1349         case 0x2011:
1350                 tape_3590_print_era_msg(device, irb);
1351                 return tape_3590_erp_read_alternate(device, request, irb);
1352
1353         case 0x2230:
1354         case 0x2231:
1355                 tape_3590_print_era_msg(device, irb);
1356                 return tape_3590_erp_special_interrupt(device, request, irb);
1357         case 0x2240:
1358                 return tape_3590_crypt_error(device, request, irb);
1359
1360         case 0x3010:
1361                 DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
1362                           device->cdev_id);
1363                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1364         case 0x3012:
1365                 DBF_EVENT(2, "(%08x): Forward at End of Partition\n",
1366                           device->cdev_id);
1367                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1368         case 0x3020:
1369                 DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id);
1370                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1371
1372         case 0x3122:
1373                 DBF_EVENT(2, "(%08x): Rewind Unload initiated\n",
1374                           device->cdev_id);
1375                 return tape_3590_erp_basic(device, request, irb, -EIO);
1376         case 0x3123:
1377                 DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
1378                           device->cdev_id);
1379                 tape_med_state_set(device, MS_UNLOADED);
1380                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1381                 return tape_3590_erp_basic(device, request, irb, 0);
1382
1383         case 0x4010:
1384                 /*
1385                  * print additional msg since default msg
1386                  * "device intervention" is not very meaningfull
1387                  */
1388                 tape_med_state_set(device, MS_UNLOADED);
1389                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1390                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1391         case 0x4012:            /* Device Long Busy */
1392                 /* XXX: Also use long busy handling here? */
1393                 DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
1394                 tape_3590_print_era_msg(device, irb);
1395                 return tape_3590_erp_basic(device, request, irb, -EBUSY);
1396         case 0x4014:
1397                 DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
1398                 return tape_3590_erp_long_busy(device, request, irb);
1399
1400         case 0x5010:
1401                 if (sense->rac == 0xd0) {
1402                         /* Swap */
1403                         tape_3590_print_era_msg(device, irb);
1404                         return tape_3590_erp_swap(device, request, irb);
1405                 }
1406                 if (sense->rac == 0x26) {
1407                         /* Read Opposite */
1408                         tape_3590_print_era_msg(device, irb);
1409                         return tape_3590_erp_read_opposite(device, request,
1410                                                            irb);
1411                 }
1412                 return tape_3590_erp_basic(device, request, irb, -EIO);
1413         case 0x5020:
1414         case 0x5021:
1415         case 0x5022:
1416         case 0x5040:
1417         case 0x5041:
1418         case 0x5042:
1419                 tape_3590_print_era_msg(device, irb);
1420                 return tape_3590_erp_swap(device, request, irb);
1421
1422         case 0x5110:
1423         case 0x5111:
1424                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1425
1426         case 0x5120:
1427         case 0x1120:
1428                 tape_med_state_set(device, MS_UNLOADED);
1429                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1430                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1431
1432         case 0x6020:
1433                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1434
1435         case 0x8011:
1436                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1437         case 0x8013:
1438                 dev_warn (&device->cdev->dev, "A different host has privileged"
1439                         " access to the tape unit\n");
1440                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1441         default:
1442                 return tape_3590_erp_basic(device, request, irb, -EIO);
1443         }
1444 }
1445
1446 /*
1447  * 3590 interrupt handler:
1448  */
1449 static int
1450 tape_3590_irq(struct tape_device *device, struct tape_request *request,
1451               struct irb *irb)
1452 {
1453         if (request == NULL)
1454                 return tape_3590_unsolicited_irq(device, irb);
1455
1456         if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) &&
1457             (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) &&
1458             (request->op == TO_WRI)) {
1459                 /* Write at end of volume */
1460                 DBF_EVENT(2, "End of volume\n");
1461                 return tape_3590_erp_failed(device, request, irb, -ENOSPC);
1462         }
1463
1464         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
1465                 return tape_3590_unit_check(device, request, irb);
1466
1467         if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
1468                 if (irb->scsw.cmd.dstat == DEV_STAT_UNIT_EXCEP) {
1469                         if (request->op == TO_FSB || request->op == TO_BSB)
1470                                 request->rescnt++;
1471                         else
1472                                 DBF_EVENT(5, "Unit Exception!\n");
1473                 }
1474
1475                 return tape_3590_done(device, request);
1476         }
1477
1478         if (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) {
1479                 DBF_EVENT(2, "channel end\n");
1480                 return TAPE_IO_PENDING;
1481         }
1482
1483         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1484                 DBF_EVENT(2, "Unit Attention when busy..\n");
1485                 return TAPE_IO_PENDING;
1486         }
1487
1488         DBF_EVENT(6, "xunknownirq\n");
1489         tape_dump_sense_dbf(device, request, irb);
1490         return TAPE_IO_STOP;
1491 }
1492
1493
1494 static int tape_3590_read_dev_chars(struct tape_device *device,
1495                                     struct tape_3590_rdc_data *rdc_data)
1496 {
1497         int rc;
1498         struct tape_request *request;
1499
1500         request = tape_alloc_request(1, sizeof(*rdc_data));
1501         if (IS_ERR(request))
1502                 return PTR_ERR(request);
1503         request->op = TO_RDC;
1504         tape_ccw_end(request->cpaddr, CCW_CMD_RDC, sizeof(*rdc_data),
1505                      request->cpdata);
1506         rc = tape_do_io(device, request);
1507         if (rc == 0)
1508                 memcpy(rdc_data, request->cpdata, sizeof(*rdc_data));
1509         tape_free_request(request);
1510         return rc;
1511 }
1512
1513 /*
1514  * Setup device function
1515  */
1516 static int
1517 tape_3590_setup_device(struct tape_device *device)
1518 {
1519         int rc;
1520         struct tape_3590_disc_data *data;
1521         struct tape_3590_rdc_data *rdc_data;
1522
1523         DBF_EVENT(6, "3590 device setup\n");
1524         data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
1525         if (data == NULL)
1526                 return -ENOMEM;
1527         data->read_back_op = READ_PREVIOUS;
1528         device->discdata = data;
1529
1530         rdc_data = kmalloc(sizeof(*rdc_data), GFP_KERNEL | GFP_DMA);
1531         if (!rdc_data) {
1532                 rc = -ENOMEM;
1533                 goto fail_kmalloc;
1534         }
1535         rc = tape_3590_read_dev_chars(device, rdc_data);
1536         if (rc) {
1537                 DBF_LH(3, "Read device characteristics failed!\n");
1538                 goto fail_rdc_data;
1539         }
1540         rc = tape_std_assign(device);
1541         if (rc)
1542                 goto fail_rdc_data;
1543         if (rdc_data->data[31] == 0x13) {
1544                 data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
1545                 tape_3592_disable_crypt(device);
1546         } else {
1547                 DBF_EVENT(6, "Device has NO crypto support\n");
1548         }
1549         /* Try to find out if medium is loaded */
1550         rc = tape_3590_sense_medium(device);
1551         if (rc) {
1552                 DBF_LH(3, "3590 medium sense returned %d\n", rc);
1553                 goto fail_rdc_data;
1554         }
1555         return 0;
1556
1557 fail_rdc_data:
1558         kfree(rdc_data);
1559 fail_kmalloc:
1560         kfree(data);
1561         return rc;
1562 }
1563
1564 /*
1565  * Cleanup device function
1566  */
1567 static void
1568 tape_3590_cleanup_device(struct tape_device *device)
1569 {
1570         flush_workqueue(tape_3590_wq);
1571         tape_std_unassign(device);
1572
1573         kfree(device->discdata);
1574         device->discdata = NULL;
1575 }
1576
1577 /*
1578  * List of 3590 magnetic tape commands.
1579  */
1580 static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = {
1581         [MTRESET]        = tape_std_mtreset,
1582         [MTFSF]          = tape_std_mtfsf,
1583         [MTBSF]          = tape_std_mtbsf,
1584         [MTFSR]          = tape_std_mtfsr,
1585         [MTBSR]          = tape_std_mtbsr,
1586         [MTWEOF]         = tape_std_mtweof,
1587         [MTREW]          = tape_std_mtrew,
1588         [MTOFFL]         = tape_std_mtoffl,
1589         [MTNOP]          = tape_std_mtnop,
1590         [MTRETEN]        = tape_std_mtreten,
1591         [MTBSFM]         = tape_std_mtbsfm,
1592         [MTFSFM]         = tape_std_mtfsfm,
1593         [MTEOM]          = tape_std_mteom,
1594         [MTERASE]        = tape_std_mterase,
1595         [MTRAS1]         = NULL,
1596         [MTRAS2]         = NULL,
1597         [MTRAS3]         = NULL,
1598         [MTSETBLK]       = tape_std_mtsetblk,
1599         [MTSETDENSITY]   = NULL,
1600         [MTSEEK]         = tape_3590_mtseek,
1601         [MTTELL]         = tape_3590_mttell,
1602         [MTSETDRVBUFFER] = NULL,
1603         [MTFSS]          = NULL,
1604         [MTBSS]          = NULL,
1605         [MTWSM]          = NULL,
1606         [MTLOCK]         = NULL,
1607         [MTUNLOCK]       = NULL,
1608         [MTLOAD]         = tape_std_mtload,
1609         [MTUNLOAD]       = tape_std_mtunload,
1610         [MTCOMPRESSION]  = tape_std_mtcompression,
1611         [MTSETPART]      = NULL,
1612         [MTMKPART]       = NULL
1613 };
1614
1615 /*
1616  * Tape discipline structure for 3590.
1617  */
1618 static struct tape_discipline tape_discipline_3590 = {
1619         .owner = THIS_MODULE,
1620         .setup_device = tape_3590_setup_device,
1621         .cleanup_device = tape_3590_cleanup_device,
1622         .process_eov = tape_std_process_eov,
1623         .irq = tape_3590_irq,
1624         .read_block = tape_std_read_block,
1625         .write_block = tape_std_write_block,
1626         .ioctl_fn = tape_3590_ioctl,
1627         .mtop_array = tape_3590_mtop
1628 };
1629
1630 static struct ccw_device_id tape_3590_ids[] = {
1631         {CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590},
1632         {CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592},
1633         { /* end of list */ }
1634 };
1635
1636 static int
1637 tape_3590_online(struct ccw_device *cdev)
1638 {
1639         return tape_generic_online(dev_get_drvdata(&cdev->dev),
1640                                    &tape_discipline_3590);
1641 }
1642
1643 static struct ccw_driver tape_3590_driver = {
1644         .driver = {
1645                 .name = "tape_3590",
1646                 .owner = THIS_MODULE,
1647         },
1648         .ids = tape_3590_ids,
1649         .probe = tape_generic_probe,
1650         .remove = tape_generic_remove,
1651         .set_offline = tape_generic_offline,
1652         .set_online = tape_3590_online,
1653         .freeze = tape_generic_pm_suspend,
1654         .int_class = IRQIO_TAP,
1655 };
1656
1657 /*
1658  * Setup discipline structure.
1659  */
1660 static int
1661 tape_3590_init(void)
1662 {
1663         int rc;
1664
1665         TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long));
1666         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1667 #ifdef DBF_LIKE_HELL
1668         debug_set_level(TAPE_DBF_AREA, 6);
1669 #endif
1670
1671         DBF_EVENT(3, "3590 init\n");
1672
1673         tape_3590_wq = alloc_workqueue("tape_3590", 0, 0);
1674         if (!tape_3590_wq)
1675                 return -ENOMEM;
1676
1677         /* Register driver for 3590 tapes. */
1678         rc = ccw_driver_register(&tape_3590_driver);
1679         if (rc) {
1680                 destroy_workqueue(tape_3590_wq);
1681                 DBF_EVENT(3, "3590 init failed\n");
1682         } else
1683                 DBF_EVENT(3, "3590 registered\n");
1684         return rc;
1685 }
1686
1687 static void
1688 tape_3590_exit(void)
1689 {
1690         ccw_driver_unregister(&tape_3590_driver);
1691         destroy_workqueue(tape_3590_wq);
1692         debug_unregister(TAPE_DBF_AREA);
1693 }
1694
1695 MODULE_DEVICE_TABLE(ccw, tape_3590_ids);
1696 MODULE_AUTHOR("(C) 2001,2006 IBM Corporation");
1697 MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver");
1698 MODULE_LICENSE("GPL");
1699
1700 module_init(tape_3590_init);
1701 module_exit(tape_3590_exit);