drivers/s390/char/tape_3590.c

   1 /*
   2  *  drivers/s390/char/tape_3590.c
   3  *    tape device discipline for 3590 tapes.
   4  *
   5  *    Copyright IBM Corp. 2001, 2009
   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 #define KMSG_COMPONENT "tape_3590"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.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 /*
  27  * Pointer to debug area.
  28  */
  29 debug_info_t *TAPE_DBF_AREA = NULL;
  30 EXPORT_SYMBOL(TAPE_DBF_AREA);
  31
  32 /*******************************************************************
  33  * Error Recovery fuctions:
  34  * - Read Opposite:              implemented
  35  * - Read Device (buffered) log: BRA
  36  * - Read Library log:           BRA
  37  * - Swap Devices:               BRA
  38  * - Long Busy:                  implemented
  39  * - Special Intercept:          BRA
  40  * - Read Alternate:             implemented
  41  *******************************************************************/
  42
  43 static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = {
  44         [0x00] = "",
  45         [0x10] = "Lost Sense",
  46         [0x11] = "Assigned Elsewhere",
  47         [0x12] = "Allegiance Reset",
  48         [0x13] = "Shared Access Violation",
  49         [0x20] = "Command Reject",
  50         [0x21] = "Configuration Error",
  51         [0x22] = "Protection Exception",
  52         [0x23] = "Write Protect",
  53         [0x24] = "Write Length",
  54         [0x25] = "Read-Only Format",
  55         [0x31] = "Beginning of Partition",
  56         [0x33] = "End of Partition",
  57         [0x34] = "End of Data",
  58         [0x35] = "Block not found",
  59         [0x40] = "Device Intervention",
  60         [0x41] = "Loader Intervention",
  61         [0x42] = "Library Intervention",
  62         [0x50] = "Write Error",
  63         [0x51] = "Erase Error",
  64         [0x52] = "Formatting Error",
  65         [0x53] = "Read Error",
  66         [0x54] = "Unsupported Format",
  67         [0x55] = "No Formatting",
  68         [0x56] = "Positioning lost",
  69         [0x57] = "Read Length",
  70         [0x60] = "Unsupported Medium",
  71         [0x61] = "Medium Length Error",
  72         [0x62] = "Medium removed",
  73         [0x64] = "Load Check",
  74         [0x65] = "Unload Check",
  75         [0x70] = "Equipment Check",
  76         [0x71] = "Bus out Check",
  77         [0x72] = "Protocol Error",
  78         [0x73] = "Interface Error",
  79         [0x74] = "Overrun",
  80         [0x75] = "Halt Signal",
  81         [0x90] = "Device fenced",
  82         [0x91] = "Device Path fenced",
  83         [0xa0] = "Volume misplaced",
  84         [0xa1] = "Volume inaccessible",
  85         [0xa2] = "Volume in input",
  86         [0xa3] = "Volume ejected",
  87         [0xa4] = "All categories reserved",
  88         [0xa5] = "Duplicate Volume",
  89         [0xa6] = "Library Manager Offline",
  90         [0xa7] = "Library Output Station full",
  91         [0xa8] = "Vision System non-operational",
  92         [0xa9] = "Library Manager Equipment Check",
  93         [0xaa] = "Library Equipment Check",
  94         [0xab] = "All Library Cells full",
  95         [0xac] = "No Cleaner Volumes in Library",
  96         [0xad] = "I/O Station door open",
  97         [0xae] = "Subsystem environmental alert",
  98 };
  99
 100 static int crypt_supported(struct tape_device *device)
 101 {
 102         return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device));
 103 }
 104
 105 static int crypt_enabled(struct tape_device *device)
 106 {
 107         return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device));
 108 }
 109
 110 static void ext_to_int_kekl(struct tape390_kekl *in,
 111                             struct tape3592_kekl *out)
 112 {
 113         int i;
 114
 115         memset(out, 0, sizeof(*out));
 116         if (in->type == TAPE390_KEKL_TYPE_HASH)
 117                 out->flags |= 0x40;
 118         if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH)
 119                 out->flags |= 0x80;
 120         strncpy(out->label, in->label, 64);
 121         for (i = strlen(in->label); i < sizeof(out->label); i++)
 122                 out->label[i] = ' ';
 123         ASCEBC(out->label, sizeof(out->label));
 124 }
 125
 126 static void int_to_ext_kekl(struct tape3592_kekl *in,
 127                             struct tape390_kekl *out)
 128 {
 129         memset(out, 0, sizeof(*out));
 130         if(in->flags & 0x40)
 131                 out->type = TAPE390_KEKL_TYPE_HASH;
 132         else
 133                 out->type = TAPE390_KEKL_TYPE_LABEL;
 134         if(in->flags & 0x80)
 135                 out->type_on_tape = TAPE390_KEKL_TYPE_HASH;
 136         else
 137                 out->type_on_tape = TAPE390_KEKL_TYPE_LABEL;
 138         memcpy(out->label, in->label, sizeof(in->label));
 139         EBCASC(out->label, sizeof(in->label));
 140         strim(out->label);
 141 }
 142
 143 static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in,
 144                                  struct tape390_kekl_pair *out)
 145 {
 146         if (in->count == 0) {
 147                 out->kekl[0].type = TAPE390_KEKL_TYPE_NONE;
 148                 out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 149                 out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
 150                 out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 151         } else if (in->count == 1) {
 152                 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
 153                 out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
 154                 out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
 155         } else if (in->count == 2) {
 156                 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
 157                 int_to_ext_kekl(&in->kekl[1], &out->kekl[1]);
 158         } else {
 159                 printk("Invalid KEKL number: %d\n", in->count);
 160                 BUG();
 161         }
 162 }
 163
 164 static int check_ext_kekl(struct tape390_kekl *kekl)
 165 {
 166         if (kekl->type == TAPE390_KEKL_TYPE_NONE)
 167                 goto invalid;
 168         if (kekl->type > TAPE390_KEKL_TYPE_HASH)
 169                 goto invalid;
 170         if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE)
 171                 goto invalid;
 172         if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH)
 173                 goto invalid;
 174         if ((kekl->type == TAPE390_KEKL_TYPE_HASH) &&
 175             (kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL))
 176                 goto invalid;
 177
 178         return 0;
 179 invalid:
 180         return -EINVAL;
 181 }
 182
 183 static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls)
 184 {
 185         if (check_ext_kekl(&kekls->kekl[0]))
 186                 goto invalid;
 187         if (check_ext_kekl(&kekls->kekl[1]))
 188                 goto invalid;
 189
 190         return 0;
 191 invalid:
 192         return -EINVAL;
 193 }
 194
 195 /*
 196  * Query KEKLs
 197  */
 198 static int tape_3592_kekl_query(struct tape_device *device,
 199                                 struct tape390_kekl_pair *ext_kekls)
 200 {
 201         struct tape_request *request;
 202         struct tape3592_kekl_query_order *order;
 203         struct tape3592_kekl_query_data *int_kekls;
 204         int rc;
 205
 206         DBF_EVENT(6, "tape3592_kekl_query\n");
 207         int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA);
 208         if (!int_kekls)
 209                 return -ENOMEM;
 210         request = tape_alloc_request(2, sizeof(*order));
 211         if (IS_ERR(request)) {
 212                 rc = PTR_ERR(request);
 213                 goto fail_malloc;
 214         }
 215         order = request->cpdata;
 216         memset(order,0,sizeof(*order));
 217         order->code = 0xe2;
 218         order->max_count = 2;
 219         request->op = TO_KEKL_QUERY;
 220         tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
 221         tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls),
 222                      int_kekls);
 223         rc = tape_do_io(device, request);
 224         if (rc)
 225                 goto fail_request;
 226         int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls);
 227
 228         rc = 0;
 229 fail_request:
 230         tape_free_request(request);
 231 fail_malloc:
 232         kfree(int_kekls);
 233         return rc;
 234 }
 235
 236 /*
 237  * IOCTL: Query KEKLs
 238  */
 239 static int tape_3592_ioctl_kekl_query(struct tape_device *device,
 240                                       unsigned long arg)
 241 {
 242         int rc;
 243         struct tape390_kekl_pair *ext_kekls;
 244
 245         DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n");
 246         if (!crypt_supported(device))
 247                 return -ENOSYS;
 248         if (!crypt_enabled(device))
 249                 return -EUNATCH;
 250         ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
 251         if (!ext_kekls)
 252                 return -ENOMEM;
 253         rc = tape_3592_kekl_query(device, ext_kekls);
 254         if (rc != 0)
 255                 goto fail;
 256         if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) {
 257                 rc = -EFAULT;
 258                 goto fail;
 259         }
 260         rc = 0;
 261 fail:
 262         kfree(ext_kekls);
 263         return rc;
 264 }
 265
 266 static int tape_3590_mttell(struct tape_device *device, int mt_count);
 267
 268 /*
 269  * Set KEKLs
 270  */
 271 static int tape_3592_kekl_set(struct tape_device *device,
 272                               struct tape390_kekl_pair *ext_kekls)
 273 {
 274         struct tape_request *request;
 275         struct tape3592_kekl_set_order *order;
 276
 277         DBF_EVENT(6, "tape3592_kekl_set\n");
 278         if (check_ext_kekl_pair(ext_kekls)) {
 279                 DBF_EVENT(6, "invalid kekls\n");
 280                 return -EINVAL;
 281         }
 282         if (tape_3590_mttell(device, 0) != 0)
 283                 return -EBADSLT;
 284         request = tape_alloc_request(1, sizeof(*order));
 285         if (IS_ERR(request))
 286                 return PTR_ERR(request);
 287         order = request->cpdata;
 288         memset(order, 0, sizeof(*order));
 289         order->code = 0xe3;
 290         order->kekls.count = 2;
 291         ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]);
 292         ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]);
 293         request->op = TO_KEKL_SET;
 294         tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
 295
 296         return tape_do_io_free(device, request);
 297 }
 298
 299 /*
 300  * IOCTL: Set KEKLs
 301  */
 302 static int tape_3592_ioctl_kekl_set(struct tape_device *device,
 303                                     unsigned long arg)
 304 {
 305         int rc;
 306         struct tape390_kekl_pair *ext_kekls;
 307
 308         DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n");
 309         if (!crypt_supported(device))
 310                 return -ENOSYS;
 311         if (!crypt_enabled(device))
 312                 return -EUNATCH;
 313         ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
 314         if (!ext_kekls)
 315                 return -ENOMEM;
 316         if (copy_from_user(ext_kekls, (char __user *)arg, sizeof(*ext_kekls))) {
 317                 rc = -EFAULT;
 318                 goto out;
 319         }
 320         rc = tape_3592_kekl_set(device, ext_kekls);
 321 out:
 322         kfree(ext_kekls);
 323         return rc;
 324 }
 325
 326 /*
 327  * Enable encryption
 328  */
 329 static int tape_3592_enable_crypt(struct tape_device *device)
 330 {
 331         struct tape_request *request;
 332         char *data;
 333
 334         DBF_EVENT(6, "tape_3592_enable_crypt\n");
 335         if (!crypt_supported(device))
 336                 return -ENOSYS;
 337         request = tape_alloc_request(2, 72);
 338         if (IS_ERR(request))
 339                 return PTR_ERR(request);
 340         data = request->cpdata;
 341         memset(data,0,72);
 342
 343         data[0]       = 0x05;
 344         data[36 + 0]  = 0x03;
 345         data[36 + 1]  = 0x03;
 346         data[36 + 4]  = 0x40;
 347         data[36 + 6]  = 0x01;
 348         data[36 + 14] = 0x2f;
 349         data[36 + 18] = 0xc3;
 350         data[36 + 35] = 0x72;
 351         request->op = TO_CRYPT_ON;
 352         tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
 353         tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
 354         return tape_do_io_free(device, request);
 355 }
 356
 357 /*
 358  * Disable encryption
 359  */
 360 static int tape_3592_disable_crypt(struct tape_device *device)
 361 {
 362         struct tape_request *request;
 363         char *data;
 364
 365         DBF_EVENT(6, "tape_3592_disable_crypt\n");
 366         if (!crypt_supported(device))
 367                 return -ENOSYS;
 368         request = tape_alloc_request(2, 72);
 369         if (IS_ERR(request))
 370                 return PTR_ERR(request);
 371         data = request->cpdata;
 372         memset(data,0,72);
 373
 374         data[0]       = 0x05;
 375         data[36 + 0]  = 0x03;
 376         data[36 + 1]  = 0x03;
 377         data[36 + 35] = 0x32;
 378
 379         request->op = TO_CRYPT_OFF;
 380         tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
 381         tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
 382
 383         return tape_do_io_free(device, request);
 384 }
 385
 386 /*
 387  * IOCTL: Set encryption status
 388  */
 389 static int tape_3592_ioctl_crypt_set(struct tape_device *device,
 390                                      unsigned long arg)
 391 {
 392         struct tape390_crypt_info info;
 393
 394         DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n");
 395         if (!crypt_supported(device))
 396                 return -ENOSYS;
 397         if (copy_from_user(&info, (char __user *)arg, sizeof(info)))
 398                 return -EFAULT;
 399         if (info.status & ~TAPE390_CRYPT_ON_MASK)
 400                 return -EINVAL;
 401         if (info.status & TAPE390_CRYPT_ON_MASK)
 402                 return tape_3592_enable_crypt(device);
 403         else
 404                 return tape_3592_disable_crypt(device);
 405 }
 406
 407 static int tape_3590_sense_medium(struct tape_device *device);
 408
 409 /*
 410  * IOCTL: Query enryption status
 411  */
 412 static int tape_3592_ioctl_crypt_query(struct tape_device *device,
 413                                        unsigned long arg)
 414 {
 415         DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n");
 416         if (!crypt_supported(device))
 417                 return -ENOSYS;
 418         tape_3590_sense_medium(device);
 419         if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device),
 420                 sizeof(TAPE_3590_CRYPT_INFO(device))))
 421                 return -EFAULT;
 422         else
 423                 return 0;
 424 }
 425
 426 /*
 427  * 3590 IOCTL Overload
 428  */
 429 static int
 430 tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
 431 {
 432         switch (cmd) {
 433         case TAPE390_DISPLAY: {
 434                 struct display_struct disp;
 435
 436                 if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)))
 437                         return -EFAULT;
 438
 439                 return tape_std_display(device, &disp);
 440         }
 441         case TAPE390_KEKL_SET:
 442                 return tape_3592_ioctl_kekl_set(device, arg);
 443         case TAPE390_KEKL_QUERY:
 444                 return tape_3592_ioctl_kekl_query(device, arg);
 445         case TAPE390_CRYPT_SET:
 446                 return tape_3592_ioctl_crypt_set(device, arg);
 447         case TAPE390_CRYPT_QUERY:
 448                 return tape_3592_ioctl_crypt_query(device, arg);
 449         default:
 450                 return -EINVAL; /* no additional ioctls */
 451         }
 452 }
 453
 454 /*
 455  * SENSE Medium: Get Sense data about medium state
 456  */
 457 static int
 458 tape_3590_sense_medium(struct tape_device *device)
 459 {
 460         struct tape_request *request;
 461
 462         request = tape_alloc_request(1, 128);
 463         if (IS_ERR(request))
 464                 return PTR_ERR(request);
 465         request->op = TO_MSEN;
 466         tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
 467         return tape_do_io_free(device, request);
 468 }
 469
 470 /*
 471  * MTTELL: Tell block. Return the number of block relative to current file.
 472  */
 473 static int
 474 tape_3590_mttell(struct tape_device *device, int mt_count)
 475 {
 476         __u64 block_id;
 477         int rc;
 478
 479         rc = tape_std_read_block_id(device, &block_id);
 480         if (rc)
 481                 return rc;
 482         return block_id >> 32;
 483 }
 484
 485 /*
 486  * MTSEEK: seek to the specified block.
 487  */
 488 static int
 489 tape_3590_mtseek(struct tape_device *device, int count)
 490 {
 491         struct tape_request *request;
 492
 493         DBF_EVENT(6, "xsee id: %x\n", count);
 494         request = tape_alloc_request(3, 4);
 495         if (IS_ERR(request))
 496                 return PTR_ERR(request);
 497         request->op = TO_LBL;
 498         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
 499         *(__u32 *) request->cpdata = count;
 500         tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
 501         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
 502         return tape_do_io_free(device, request);
 503 }
 504
 505 /*
 506  * Read Opposite Error Recovery Function:
 507  * Used, when Read Forward does not work
 508  */
 509 static void
 510 tape_3590_read_opposite(struct tape_device *device,
 511                         struct tape_request *request)
 512 {
 513         struct tape_3590_disc_data *data;
 514
 515         /*
 516          * We have allocated 4 ccws in tape_std_read, so we can now
 517          * transform the request to a read backward, followed by a
 518          * forward space block.
 519          */
 520         request->op = TO_RBA;
 521         tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
 522         data = device->discdata;
 523         tape_ccw_cc_idal(request->cpaddr + 1, data->read_back_op,
 524                          device->char_data.idal_buf);
 525         tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL);
 526         tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL);
 527         DBF_EVENT(6, "xrop ccwg\n");
 528 }
 529
 530 /*
 531  * Read Attention Msg
 532  * This should be done after an interrupt with attention bit (0x80)
 533  * in device state.
 534  *
 535  * After a "read attention message" request there are two possible
 536  * results:
 537  *
 538  * 1. A unit check is presented, when attention sense is present (e.g. when
 539  * a medium has been unloaded). The attention sense comes then
 540  * together with the unit check. The recovery action is either "retry"
 541  * (in case there is an attention message pending) or "permanent error".
 542  *
 543  * 2. The attention msg is written to the "read subsystem data" buffer.
 544  * In this case we probably should print it to the console.
 545  */
 546 static int
 547 tape_3590_read_attmsg(struct tape_device *device)
 548 {
 549         struct tape_request *request;
 550         char *buf;
 551
 552         request = tape_alloc_request(3, 4096);
 553         if (IS_ERR(request))
 554                 return PTR_ERR(request);
 555         request->op = TO_READ_ATTMSG;
 556         buf = request->cpdata;
 557         buf[0] = PREP_RD_SS_DATA;
 558         buf[6] = RD_ATTMSG;     /* read att msg */
 559         tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf);
 560         tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12);
 561         tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
 562         return tape_do_io_free(device, request);
 563 }
 564
 565 /*
 566  * These functions are used to schedule follow-up actions from within an
 567  * interrupt context (like unsolicited interrupts).
 568  */
 569 struct work_handler_data {
 570         struct tape_device *device;
 571         enum tape_op        op;
 572         struct work_struct  work;
 573 };
 574
 575 static void
 576 tape_3590_work_handler(struct work_struct *work)
 577 {
 578         struct work_handler_data *p =
 579                 container_of(work, struct work_handler_data, work);
 580
 581         switch (p->op) {
 582         case TO_MSEN:
 583                 tape_3590_sense_medium(p->device);
 584                 break;
 585         case TO_READ_ATTMSG:
 586                 tape_3590_read_attmsg(p->device);
 587                 break;
 588         case TO_CRYPT_ON:
 589                 tape_3592_enable_crypt(p->device);
 590                 break;
 591         case TO_CRYPT_OFF:
 592                 tape_3592_disable_crypt(p->device);
 593                 break;
 594         default:
 595                 DBF_EVENT(3, "T3590: work handler undefined for "
 596                           "operation 0x%02x\n", p->op);
 597         }
 598         tape_put_device(p->device);
 599         kfree(p);
 600 }
 601
 602 static int
 603 tape_3590_schedule_work(struct tape_device *device, enum tape_op op)
 604 {
 605         struct work_handler_data *p;
 606
 607         if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
 608                 return -ENOMEM;
 609
 610         INIT_WORK(&p->work, tape_3590_work_handler);
 611
 612         p->device = tape_get_device(device);
 613         p->op = op;
 614
 615         schedule_work(&p->work);
 616         return 0;
 617 }
 618
 619 #ifdef CONFIG_S390_TAPE_BLOCK
 620 /*
 621  * Tape Block READ
 622  */
 623 static struct tape_request *
 624 tape_3590_bread(struct tape_device *device, struct request *req)
 625 {
 626         struct tape_request *request;
 627         struct ccw1 *ccw;
 628         int count = 0, start_block;
 629         unsigned off;
 630         char *dst;
 631         struct bio_vec *bv;
 632         struct req_iterator iter;
 633
 634         DBF_EVENT(6, "xBREDid:");
 635         start_block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B;
 636         DBF_EVENT(6, "start_block = %i\n", start_block);
 637
 638         rq_for_each_segment(bv, req, iter)
 639                 count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
 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_segment(bv, req, iter) {
 657                 dst = page_address(bv->bv_page) + bv->bv_offset;
 658                 for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) {
 659                         ccw->flags = CCW_FLAG_CC;
 660                         ccw->cmd_code = READ_FORWARD;
 661                         ccw->count = TAPEBLOCK_HSEC_SIZE;
 662                         set_normalized_cda(ccw, (void *) __pa(dst));
 663                         ccw++;
 664                         dst += TAPEBLOCK_HSEC_SIZE;
 665                 }
 666                 BUG_ON(off > bv->bv_len);
 667         }
 668         ccw = tape_ccw_end(ccw, NOP, 0, NULL);
 669         DBF_EVENT(6, "xBREDccwg\n");
 670         return request;
 671 }
 672
 673 static void
 674 tape_3590_free_bread(struct tape_request *request)
 675 {
 676         struct ccw1 *ccw;
 677
 678         /* Last ccw is a nop and doesn't need clear_normalized_cda */
 679         for (ccw = request->cpaddr; ccw->flags & CCW_FLAG_CC; ccw++)
 680                 if (ccw->cmd_code == READ_FORWARD)
 681                         clear_normalized_cda(ccw);
 682         tape_free_request(request);
 683 }
 684
 685 /*
 686  * check_locate is called just before the tape request is passed to
 687  * the common io layer for execution. It has to check the current
 688  * tape position and insert a locate ccw if it doesn't match the
 689  * start block for the request.
 690  */
 691 static void
 692 tape_3590_check_locate(struct tape_device *device, struct tape_request *request)
 693 {
 694         __u32 *start_block;
 695
 696         start_block = (__u32 *) request->cpdata;
 697         if (*start_block != device->blk_data.block_position) {
 698                 /* Add the start offset of the file to get the real block. */
 699                 *start_block += device->bof;
 700                 tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
 701         }
 702 }
 703 #endif
 704
 705 static void tape_3590_med_state_set(struct tape_device *device,
 706                                     struct tape_3590_med_sense *sense)
 707 {
 708         struct tape390_crypt_info *c_info;
 709
 710         c_info = &TAPE_3590_CRYPT_INFO(device);
 711
 712         DBF_EVENT(6, "medium state: %x:%x\n", sense->macst, sense->masst);
 713         switch (sense->macst) {
 714         case 0x04:
 715         case 0x05:
 716         case 0x06:
 717                 tape_med_state_set(device, MS_UNLOADED);
 718                 TAPE_3590_CRYPT_INFO(device).medium_status = 0;
 719                 return;
 720         case 0x08:
 721         case 0x09:
 722                 tape_med_state_set(device, MS_LOADED);
 723                 break;
 724         default:
 725                 tape_med_state_set(device, MS_UNKNOWN);
 726                 return;
 727         }
 728         c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
 729         if (sense->flags & MSENSE_CRYPT_MASK) {
 730                 DBF_EVENT(6, "Medium is encrypted (%04x)\n", sense->flags);
 731                 c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
 732         } else  {
 733                 DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
 734                 c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
 735         }
 736 }
 737
 738 /*
 739  * The done handler is called at device/channel end and wakes up the sleeping
 740  * process
 741  */
 742 static int
 743 tape_3590_done(struct tape_device *device, struct tape_request *request)
 744 {
 745         struct tape_3590_disc_data *disc_data;
 746
 747         DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
 748         disc_data = device->discdata;
 749
 750         switch (request->op) {
 751         case TO_BSB:
 752         case TO_BSF:
 753         case TO_DSE:
 754         case TO_FSB:
 755         case TO_FSF:
 756         case TO_LBL:
 757         case TO_RFO:
 758         case TO_RBA:
 759         case TO_REW:
 760         case TO_WRI:
 761         case TO_WTM:
 762         case TO_BLOCK:
 763         case TO_LOAD:
 764                 tape_med_state_set(device, MS_LOADED);
 765                 break;
 766         case TO_RUN:
 767                 tape_med_state_set(device, MS_UNLOADED);
 768                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
 769                 break;
 770         case TO_MSEN:
 771                 tape_3590_med_state_set(device, request->cpdata);
 772                 break;
 773         case TO_CRYPT_ON:
 774                 TAPE_3590_CRYPT_INFO(device).status
 775                         |= TAPE390_CRYPT_ON_MASK;
 776                 *(device->modeset_byte) |= 0x03;
 777                 break;
 778         case TO_CRYPT_OFF:
 779                 TAPE_3590_CRYPT_INFO(device).status
 780                         &= ~TAPE390_CRYPT_ON_MASK;
 781                 *(device->modeset_byte) &= ~0x03;
 782                 break;
 783         case TO_RBI:    /* RBI seems to succeed even without medium loaded. */
 784         case TO_NOP:    /* Same to NOP. */
 785         case TO_READ_CONFIG:
 786         case TO_READ_ATTMSG:
 787         case TO_DIS:
 788         case TO_ASSIGN:
 789         case TO_UNASSIGN:
 790         case TO_SIZE:
 791         case TO_KEKL_SET:
 792         case TO_KEKL_QUERY:
 793         case TO_RDC:
 794                 break;
 795         }
 796         return TAPE_IO_SUCCESS;
 797 }
 798
 799 /*
 800  * This fuction is called, when error recovery was successfull
 801  */
 802 static inline int
 803 tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request)
 804 {
 805         DBF_EVENT(3, "Error Recovery successful for %s\n",
 806                   tape_op_verbose[request->op]);
 807         return tape_3590_done(device, request);
 808 }
 809
 810 /*
 811  * This fuction is called, when error recovery was not successfull
 812  */
 813 static inline int
 814 tape_3590_erp_failed(struct tape_device *device, struct tape_request *request,
 815                      struct irb *irb, int rc)
 816 {
 817         DBF_EVENT(3, "Error Recovery failed for %s\n",
 818                   tape_op_verbose[request->op]);
 819         tape_dump_sense_dbf(device, request, irb);
 820         return rc;
 821 }
 822
 823 /*
 824  * Error Recovery do retry
 825  */
 826 static inline int
 827 tape_3590_erp_retry(struct tape_device *device, struct tape_request *request,
 828                     struct irb *irb)
 829 {
 830         DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]);
 831         tape_dump_sense_dbf(device, request, irb);
 832         return TAPE_IO_RETRY;
 833 }
 834
 835 /*
 836  * Handle unsolicited interrupts
 837  */
 838 static int
 839 tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb)
 840 {
 841         if (irb->scsw.cmd.dstat == DEV_STAT_CHN_END)
 842                 /* Probably result of halt ssch */
 843                 return TAPE_IO_PENDING;
 844         else if (irb->scsw.cmd.dstat == 0x85)
 845                 /* Device Ready */
 846                 DBF_EVENT(3, "unsol.irq! tape ready: %08x\n", device->cdev_id);
 847         else if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 848                 tape_3590_schedule_work(device, TO_READ_ATTMSG);
 849         } else {
 850                 DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
 851                 tape_dump_sense_dbf(device, NULL, irb);
 852         }
 853         /* check medium state */
 854         tape_3590_schedule_work(device, TO_MSEN);
 855         return TAPE_IO_SUCCESS;
 856 }
 857
 858 /*
 859  * Basic Recovery routine
 860  */
 861 static int
 862 tape_3590_erp_basic(struct tape_device *device, struct tape_request *request,
 863                     struct irb *irb, int rc)
 864 {
 865         struct tape_3590_sense *sense;
 866
 867         sense = (struct tape_3590_sense *) irb->ecw;
 868
 869         switch (sense->bra) {
 870         case SENSE_BRA_PER:
 871                 return tape_3590_erp_failed(device, request, irb, rc);
 872         case SENSE_BRA_CONT:
 873                 return tape_3590_erp_succeded(device, request);
 874         case SENSE_BRA_RE:
 875                 return tape_3590_erp_retry(device, request, irb);
 876         case SENSE_BRA_DRE:
 877                 return tape_3590_erp_failed(device, request, irb, rc);
 878         default:
 879                 BUG();
 880                 return TAPE_IO_STOP;
 881         }
 882 }
 883
 884 /*
 885  *  RDL: Read Device (buffered) log
 886  */
 887 static int
 888 tape_3590_erp_read_buf_log(struct tape_device *device,
 889                            struct tape_request *request, struct irb *irb)
 890 {
 891         /*
 892          * We just do the basic error recovery at the moment (retry).
 893          * Perhaps in the future, we read the log and dump it somewhere...
 894          */
 895         return tape_3590_erp_basic(device, request, irb, -EIO);
 896 }
 897
 898 /*
 899  *  SWAP: Swap Devices
 900  */
 901 static int
 902 tape_3590_erp_swap(struct tape_device *device, struct tape_request *request,
 903                    struct irb *irb)
 904 {
 905         /*
 906          * This error recovery should swap the tapes
 907          * if the original has a problem. The operation
 908          * should proceed with the new tape... this
 909          * should probably be done in user space!
 910          */
 911         dev_warn (&device->cdev->dev, "The tape medium must be loaded into a "
 912                 "different tape unit\n");
 913         return tape_3590_erp_basic(device, request, irb, -EIO);
 914 }
 915
 916 /*
 917  *  LBY: Long Busy
 918  */
 919 static int
 920 tape_3590_erp_long_busy(struct tape_device *device,
 921                         struct tape_request *request, struct irb *irb)
 922 {
 923         DBF_EVENT(6, "Device is busy\n");
 924         return TAPE_IO_LONG_BUSY;
 925 }
 926
 927 /*
 928  *  SPI: Special Intercept
 929  */
 930 static int
 931 tape_3590_erp_special_interrupt(struct tape_device *device,
 932                                 struct tape_request *request, struct irb *irb)
 933 {
 934         return tape_3590_erp_basic(device, request, irb, -EIO);
 935 }
 936
 937 /*
 938  *  RDA: Read Alternate
 939  */
 940 static int
 941 tape_3590_erp_read_alternate(struct tape_device *device,
 942                              struct tape_request *request, struct irb *irb)
 943 {
 944         struct tape_3590_disc_data *data;
 945
 946         /*
 947          * The issued Read Backward or Read Previous command is not
 948          * supported by the device
 949          * The recovery action should be to issue another command:
 950          * Read Revious: if Read Backward is not supported
 951          * Read Backward: if Read Previous is not supported
 952          */
 953         data = device->discdata;
 954         if (data->read_back_op == READ_PREVIOUS) {
 955                 DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n",
 956                           device->cdev_id);
 957                 data->read_back_op = READ_BACKWARD;
 958         } else {
 959                 DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n",
 960                           device->cdev_id);
 961                 data->read_back_op = READ_PREVIOUS;
 962         }
 963         tape_3590_read_opposite(device, request);
 964         return tape_3590_erp_retry(device, request, irb);
 965 }
 966
 967 /*
 968  * Error Recovery read opposite
 969  */
 970 static int
 971 tape_3590_erp_read_opposite(struct tape_device *device,
 972                             struct tape_request *request, struct irb *irb)
 973 {
 974         switch (request->op) {
 975         case TO_RFO:
 976                 /*
 977                  * We did read forward, but the data could not be read.
 978                  * We will read backward and then skip forward again.
 979                  */
 980                 tape_3590_read_opposite(device, request);
 981                 return tape_3590_erp_retry(device, request, irb);
 982         case TO_RBA:
 983                 /* We tried to read forward and backward, but hat no success */
 984                 return tape_3590_erp_failed(device, request, irb, -EIO);
 985                 break;
 986         default:
 987                 return tape_3590_erp_failed(device, request, irb, -EIO);
 988         }
 989 }
 990
 991 /*
 992  * Print an MIM (Media Information  Message) (message code f0)
 993  */
 994 static void
 995 tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb)
 996 {
 997         struct tape_3590_sense *sense;
 998         char *exception, *service;
 999
1000         exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1001         service = kmalloc(BUFSIZE, GFP_ATOMIC);
1002
1003         if (!exception || !service)
1004                 goto out_nomem;
1005
1006         sense = (struct tape_3590_sense *) irb->ecw;
1007         /* Exception Message */
1008         switch (sense->fmt.f70.emc) {
1009         case 0x02:
1010                 snprintf(exception, BUFSIZE, "Data degraded");
1011                 break;
1012         case 0x03:
1013                 snprintf(exception, BUFSIZE, "Data degraded in partion %i",
1014                         sense->fmt.f70.mp);
1015                 break;
1016         case 0x04:
1017                 snprintf(exception, BUFSIZE, "Medium degraded");
1018                 break;
1019         case 0x05:
1020                 snprintf(exception, BUFSIZE, "Medium degraded in partition %i",
1021                         sense->fmt.f70.mp);
1022                 break;
1023         case 0x06:
1024                 snprintf(exception, BUFSIZE, "Block 0 Error");
1025                 break;
1026         case 0x07:
1027                 snprintf(exception, BUFSIZE, "Medium Exception 0x%02x",
1028                         sense->fmt.f70.md);
1029                 break;
1030         default:
1031                 snprintf(exception, BUFSIZE, "0x%02x",
1032                         sense->fmt.f70.emc);
1033                 break;
1034         }
1035         /* Service Message */
1036         switch (sense->fmt.f70.smc) {
1037         case 0x02:
1038                 snprintf(service, BUFSIZE, "Reference Media maintenance "
1039                         "procedure %i", sense->fmt.f70.md);
1040                 break;
1041         default:
1042                 snprintf(service, BUFSIZE, "0x%02x",
1043                         sense->fmt.f70.smc);
1044                 break;
1045         }
1046
1047         dev_warn (&device->cdev->dev, "Tape media information: exception %s, "
1048                 "service %s\n", exception, service);
1049
1050 out_nomem:
1051         kfree(exception);
1052         kfree(service);
1053 }
1054
1055 /*
1056  * Print an I/O Subsystem Service Information Message (message code f1)
1057  */
1058 static void
1059 tape_3590_print_io_sim_msg_f1(struct tape_device *device, struct irb *irb)
1060 {
1061         struct tape_3590_sense *sense;
1062         char *exception, *service;
1063
1064         exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1065         service = kmalloc(BUFSIZE, GFP_ATOMIC);
1066
1067         if (!exception || !service)
1068                 goto out_nomem;
1069
1070         sense = (struct tape_3590_sense *) irb->ecw;
1071         /* Exception Message */
1072         switch (sense->fmt.f71.emc) {
1073         case 0x01:
1074                 snprintf(exception, BUFSIZE, "Effect of failure is unknown");
1075                 break;
1076         case 0x02:
1077                 snprintf(exception, BUFSIZE, "CU Exception - no performance "
1078                         "impact");
1079                 break;
1080         case 0x03:
1081                 snprintf(exception, BUFSIZE, "CU Exception on channel "
1082                         "interface 0x%02x", sense->fmt.f71.md[0]);
1083                 break;
1084         case 0x04:
1085                 snprintf(exception, BUFSIZE, "CU Exception on device path "
1086                         "0x%02x", sense->fmt.f71.md[0]);
1087                 break;
1088         case 0x05:
1089                 snprintf(exception, BUFSIZE, "CU Exception on library path "
1090                         "0x%02x", sense->fmt.f71.md[0]);
1091                 break;
1092         case 0x06:
1093                 snprintf(exception, BUFSIZE, "CU Exception on node 0x%02x",
1094                         sense->fmt.f71.md[0]);
1095                 break;
1096         case 0x07:
1097                 snprintf(exception, BUFSIZE, "CU Exception on partition "
1098                         "0x%02x", sense->fmt.f71.md[0]);
1099                 break;
1100         default:
1101                 snprintf(exception, BUFSIZE, "0x%02x",
1102                         sense->fmt.f71.emc);
1103         }
1104         /* Service Message */
1105         switch (sense->fmt.f71.smc) {
1106         case 0x01:
1107                 snprintf(service, BUFSIZE, "Repair impact is unknown");
1108                 break;
1109         case 0x02:
1110                 snprintf(service, BUFSIZE, "Repair will not impact cu "
1111                         "performance");
1112                 break;
1113         case 0x03:
1114                 if (sense->fmt.f71.mdf == 0)
1115                         snprintf(service, BUFSIZE, "Repair will disable node "
1116                                 "0x%x on CU", sense->fmt.f71.md[1]);
1117                 else
1118                         snprintf(service, BUFSIZE, "Repair will disable "
1119                                 "nodes (0x%x-0x%x) on CU", sense->fmt.f71.md[1],
1120                                 sense->fmt.f71.md[2]);
1121                 break;
1122         case 0x04:
1123                 if (sense->fmt.f71.mdf == 0)
1124                         snprintf(service, BUFSIZE, "Repair will disable "
1125                                 "channel path 0x%x on CU",
1126                                 sense->fmt.f71.md[1]);
1127                 else
1128                         snprintf(service, BUFSIZE, "Repair will disable cannel"
1129                                 " paths (0x%x-0x%x) on CU",
1130                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1131                 break;
1132         case 0x05:
1133                 if (sense->fmt.f71.mdf == 0)
1134                         snprintf(service, BUFSIZE, "Repair will disable device"
1135                                 " path 0x%x on CU", sense->fmt.f71.md[1]);
1136                 else
1137                         snprintf(service, BUFSIZE, "Repair will disable device"
1138                                 " paths (0x%x-0x%x) on CU",
1139                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1140                 break;
1141         case 0x06:
1142                 if (sense->fmt.f71.mdf == 0)
1143                         snprintf(service, BUFSIZE, "Repair will disable "
1144                                 "library path 0x%x on CU",
1145                                 sense->fmt.f71.md[1]);
1146                 else
1147                         snprintf(service, BUFSIZE, "Repair will disable "
1148                                 "library paths (0x%x-0x%x) on CU",
1149                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1150                 break;
1151         case 0x07:
1152                 snprintf(service, BUFSIZE, "Repair will disable access to CU");
1153                 break;
1154         default:
1155                 snprintf(service, BUFSIZE, "0x%02x",
1156                         sense->fmt.f71.smc);
1157         }
1158
1159         dev_warn (&device->cdev->dev, "I/O subsystem information: exception"
1160                 " %s, service %s\n", exception, service);
1161 out_nomem:
1162         kfree(exception);
1163         kfree(service);
1164 }
1165
1166 /*
1167  * Print an Device Subsystem Service Information Message (message code f2)
1168  */
1169 static void
1170 tape_3590_print_dev_sim_msg_f2(struct tape_device *device, struct irb *irb)
1171 {
1172         struct tape_3590_sense *sense;
1173         char *exception, *service;
1174
1175         exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1176         service = kmalloc(BUFSIZE, GFP_ATOMIC);
1177
1178         if (!exception || !service)
1179                 goto out_nomem;
1180
1181         sense = (struct tape_3590_sense *) irb->ecw;
1182         /* Exception Message */
1183         switch (sense->fmt.f71.emc) {
1184         case 0x01:
1185                 snprintf(exception, BUFSIZE, "Effect of failure is unknown");
1186                 break;
1187         case 0x02:
1188                 snprintf(exception, BUFSIZE, "DV Exception - no performance"
1189                         " impact");
1190                 break;
1191         case 0x03:
1192                 snprintf(exception, BUFSIZE, "DV Exception on channel "
1193                         "interface 0x%02x", sense->fmt.f71.md[0]);
1194                 break;
1195         case 0x04:
1196                 snprintf(exception, BUFSIZE, "DV Exception on loader 0x%02x",
1197                         sense->fmt.f71.md[0]);
1198                 break;
1199         case 0x05:
1200                 snprintf(exception, BUFSIZE, "DV Exception on message display"
1201                         " 0x%02x", sense->fmt.f71.md[0]);
1202                 break;
1203         case 0x06:
1204                 snprintf(exception, BUFSIZE, "DV Exception in tape path");
1205                 break;
1206         case 0x07:
1207                 snprintf(exception, BUFSIZE, "DV Exception in drive");
1208                 break;
1209         default:
1210                 snprintf(exception, BUFSIZE, "0x%02x",
1211                         sense->fmt.f71.emc);
1212         }
1213         /* Service Message */
1214         switch (sense->fmt.f71.smc) {
1215         case 0x01:
1216                 snprintf(service, BUFSIZE, "Repair impact is unknown");
1217                 break;
1218         case 0x02:
1219                 snprintf(service, BUFSIZE, "Repair will not impact device "
1220                         "performance");
1221                 break;
1222         case 0x03:
1223                 if (sense->fmt.f71.mdf == 0)
1224                         snprintf(service, BUFSIZE, "Repair will disable "
1225                                 "channel path 0x%x on DV",
1226                                 sense->fmt.f71.md[1]);
1227                 else
1228                         snprintf(service, BUFSIZE, "Repair will disable "
1229                                 "channel path (0x%x-0x%x) on DV",
1230                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1231                 break;
1232         case 0x04:
1233                 if (sense->fmt.f71.mdf == 0)
1234                         snprintf(service, BUFSIZE, "Repair will disable "
1235                                 "interface 0x%x on DV", sense->fmt.f71.md[1]);
1236                 else
1237                         snprintf(service, BUFSIZE, "Repair will disable "
1238                                 "interfaces (0x%x-0x%x) on DV",
1239                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1240                 break;
1241         case 0x05:
1242                 if (sense->fmt.f71.mdf == 0)
1243                         snprintf(service, BUFSIZE, "Repair will disable loader"
1244                                 " 0x%x on DV", sense->fmt.f71.md[1]);
1245                 else
1246                         snprintf(service, BUFSIZE, "Repair will disable loader"
1247                                 " (0x%x-0x%x) on DV",
1248                                 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1249                 break;
1250         case 0x07:
1251                 snprintf(service, BUFSIZE, "Repair will disable access to DV");
1252                 break;
1253         case 0x08:
1254                 if (sense->fmt.f71.mdf == 0)
1255                         snprintf(service, BUFSIZE, "Repair will disable "
1256                                 "message display 0x%x on DV",
1257                                 sense->fmt.f71.md[1]);
1258                 else
1259                         snprintf(service, BUFSIZE, "Repair will disable "
1260                                 "message displays (0x%x-0x%x) on DV",
1261                                  sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1262                 break;
1263         case 0x09:
1264                 snprintf(service, BUFSIZE, "Clean DV");
1265                 break;
1266         default:
1267                 snprintf(service, BUFSIZE, "0x%02x",
1268                         sense->fmt.f71.smc);
1269         }
1270
1271         dev_warn (&device->cdev->dev, "Device subsystem information: exception"
1272                 " %s, service %s\n", exception, service);
1273 out_nomem:
1274         kfree(exception);
1275         kfree(service);
1276 }
1277
1278 /*
1279  * Print standard ERA Message
1280  */
1281 static void
1282 tape_3590_print_era_msg(struct tape_device *device, struct irb *irb)
1283 {
1284         struct tape_3590_sense *sense;
1285
1286         sense = (struct tape_3590_sense *) irb->ecw;
1287         if (sense->mc == 0)
1288                 return;
1289         if ((sense->mc > 0) && (sense->mc < TAPE_3590_MAX_MSG)) {
1290                 if (tape_3590_msg[sense->mc] != NULL)
1291                         dev_warn (&device->cdev->dev, "The tape unit has "
1292                                 "issued sense message %s\n",
1293                                 tape_3590_msg[sense->mc]);
1294                 else
1295                         dev_warn (&device->cdev->dev, "The tape unit has "
1296                                 "issued an unknown sense message code 0x%x\n",
1297                                 sense->mc);
1298                 return;
1299         }
1300         if (sense->mc == 0xf0) {
1301                 /* Standard Media Information Message */
1302                 dev_warn (&device->cdev->dev, "MIM SEV=%i, MC=%02x, ES=%x/%x, "
1303                         "RC=%02x-%04x-%02x\n", sense->fmt.f70.sev, sense->mc,
1304                         sense->fmt.f70.emc, sense->fmt.f70.smc,
1305                         sense->fmt.f70.refcode, sense->fmt.f70.mid,
1306                         sense->fmt.f70.fid);
1307                 tape_3590_print_mim_msg_f0(device, irb);
1308                 return;
1309         }
1310         if (sense->mc == 0xf1) {
1311                 /* Standard I/O Subsystem Service Information Message */
1312                 dev_warn (&device->cdev->dev, "IOSIM SEV=%i, DEVTYPE=3590/%02x,"
1313                         " MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1314                         sense->fmt.f71.sev, device->cdev->id.dev_model,
1315                         sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
1316                         sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
1317                         sense->fmt.f71.refcode3);
1318                 tape_3590_print_io_sim_msg_f1(device, irb);
1319                 return;
1320         }
1321         if (sense->mc == 0xf2) {
1322                 /* Standard Device Service Information Message */
1323                 dev_warn (&device->cdev->dev, "DEVSIM SEV=%i, DEVTYPE=3590/%02x"
1324                         ", MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1325                         sense->fmt.f71.sev, device->cdev->id.dev_model,
1326                         sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
1327                         sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
1328                         sense->fmt.f71.refcode3);
1329                 tape_3590_print_dev_sim_msg_f2(device, irb);
1330                 return;
1331         }
1332         if (sense->mc == 0xf3) {
1333                 /* Standard Library Service Information Message */
1334                 return;
1335         }
1336         dev_warn (&device->cdev->dev, "The tape unit has issued an unknown "
1337                 "sense message code %x\n", sense->mc);
1338 }
1339
1340 static int tape_3590_crypt_error(struct tape_device *device,
1341                                  struct tape_request *request, struct irb *irb)
1342 {
1343         u8 cu_rc, ekm_rc1;
1344         u16 ekm_rc2;
1345         u32 drv_rc;
1346         const char *bus_id;
1347         char *sense;
1348
1349         sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
1350         bus_id = dev_name(&device->cdev->dev);
1351         cu_rc = sense[0];
1352         drv_rc = *((u32*) &sense[5]) & 0xffffff;
1353         ekm_rc1 = sense[9];
1354         ekm_rc2 = *((u16*) &sense[10]);
1355         if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
1356                 /* key not defined on EKM */
1357                 return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
1358         if ((cu_rc == 1) || (cu_rc == 2))
1359                 /* No connection to EKM */
1360                 return tape_3590_erp_basic(device, request, irb, -ENOTCONN);
1361
1362         dev_err (&device->cdev->dev, "The tape unit failed to obtain the "
1363                 "encryption key from EKM\n");
1364
1365         return tape_3590_erp_basic(device, request, irb, -ENOKEY);
1366 }
1367
1368 /*
1369  *  3590 error Recovery routine:
1370  *  If possible, it tries to recover from the error. If this is not possible,
1371  *  inform the user about the problem.
1372  */
1373 static int
1374 tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
1375                      struct irb *irb)
1376 {
1377         struct tape_3590_sense *sense;
1378         int rc;
1379
1380 #ifdef CONFIG_S390_TAPE_BLOCK
1381         if (request->op == TO_BLOCK) {
1382                 /*
1383                  * Recovery for block device requests. Set the block_position
1384                  * to something invalid and retry.
1385                  */
1386                 device->blk_data.block_position = -1;
1387                 if (request->retries-- <= 0)
1388                         return tape_3590_erp_failed(device, request, irb, -EIO);
1389                 else
1390                         return tape_3590_erp_retry(device, request, irb);
1391         }
1392 #endif
1393
1394         sense = (struct tape_3590_sense *) irb->ecw;
1395
1396         DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);
1397
1398         /*
1399          * First check all RC-QRCs where we want to do something special
1400          *   - "break":     basic error recovery is done
1401          *   - "goto out:": just print error message if available
1402          */
1403         rc = -EIO;
1404         switch (sense->rc_rqc) {
1405
1406         case 0x1110:
1407                 tape_3590_print_era_msg(device, irb);
1408                 return tape_3590_erp_read_buf_log(device, request, irb);
1409
1410         case 0x2011:
1411                 tape_3590_print_era_msg(device, irb);
1412                 return tape_3590_erp_read_alternate(device, request, irb);
1413
1414         case 0x2230:
1415         case 0x2231:
1416                 tape_3590_print_era_msg(device, irb);
1417                 return tape_3590_erp_special_interrupt(device, request, irb);
1418         case 0x2240:
1419                 return tape_3590_crypt_error(device, request, irb);
1420
1421         case 0x3010:
1422                 DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
1423                           device->cdev_id);
1424                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1425         case 0x3012:
1426                 DBF_EVENT(2, "(%08x): Forward at End of Partition\n",
1427                           device->cdev_id);
1428                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1429         case 0x3020:
1430                 DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id);
1431                 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1432
1433         case 0x3122:
1434                 DBF_EVENT(2, "(%08x): Rewind Unload initiated\n",
1435                           device->cdev_id);
1436                 return tape_3590_erp_basic(device, request, irb, -EIO);
1437         case 0x3123:
1438                 DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
1439                           device->cdev_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, 0);
1443
1444         case 0x4010:
1445                 /*
1446                  * print additional msg since default msg
1447                  * "device intervention" is not very meaningfull
1448                  */
1449                 tape_med_state_set(device, MS_UNLOADED);
1450                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1451                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1452         case 0x4012:            /* Device Long Busy */
1453                 /* XXX: Also use long busy handling here? */
1454                 DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
1455                 tape_3590_print_era_msg(device, irb);
1456                 return tape_3590_erp_basic(device, request, irb, -EBUSY);
1457         case 0x4014:
1458                 DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
1459                 return tape_3590_erp_long_busy(device, request, irb);
1460
1461         case 0x5010:
1462                 if (sense->rac == 0xd0) {
1463                         /* Swap */
1464                         tape_3590_print_era_msg(device, irb);
1465                         return tape_3590_erp_swap(device, request, irb);
1466                 }
1467                 if (sense->rac == 0x26) {
1468                         /* Read Opposite */
1469                         tape_3590_print_era_msg(device, irb);
1470                         return tape_3590_erp_read_opposite(device, request,
1471                                                            irb);
1472                 }
1473                 return tape_3590_erp_basic(device, request, irb, -EIO);
1474         case 0x5020:
1475         case 0x5021:
1476         case 0x5022:
1477         case 0x5040:
1478         case 0x5041:
1479         case 0x5042:
1480                 tape_3590_print_era_msg(device, irb);
1481                 return tape_3590_erp_swap(device, request, irb);
1482
1483         case 0x5110:
1484         case 0x5111:
1485                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1486
1487         case 0x5120:
1488         case 0x1120:
1489                 tape_med_state_set(device, MS_UNLOADED);
1490                 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1491                 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1492
1493         case 0x6020:
1494                 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1495
1496         case 0x8011:
1497                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1498         case 0x8013:
1499                 dev_warn (&device->cdev->dev, "A different host has privileged"
1500                         " access to the tape unit\n");
1501                 return tape_3590_erp_basic(device, request, irb, -EPERM);
1502         default:
1503                 return tape_3590_erp_basic(device, request, irb, -EIO);
1504         }
1505 }
1506
1507 /*
1508  * 3590 interrupt handler:
1509  */
1510 static int
1511 tape_3590_irq(struct tape_device *device, struct tape_request *request,
1512               struct irb *irb)
1513 {
1514         if (request == NULL)
1515                 return tape_3590_unsolicited_irq(device, irb);
1516
1517         if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) &&
1518             (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) &&
1519             (request->op == TO_WRI)) {
1520                 /* Write at end of volume */
1521                 DBF_EVENT(2, "End of volume\n");
1522                 return tape_3590_erp_failed(device, request, irb, -ENOSPC);
1523         }
1524
1525         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
1526                 return tape_3590_unit_check(device, request, irb);
1527
1528         if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
1529                 if (irb->scsw.cmd.dstat == DEV_STAT_UNIT_EXCEP) {
1530                         if (request->op == TO_FSB || request->op == TO_BSB)
1531                                 request->rescnt++;
1532                         else
1533                                 DBF_EVENT(5, "Unit Exception!\n");
1534                 }
1535
1536                 return tape_3590_done(device, request);
1537         }
1538
1539         if (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) {
1540                 DBF_EVENT(2, "cannel end\n");
1541                 return TAPE_IO_PENDING;
1542         }
1543
1544         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1545                 DBF_EVENT(2, "Unit Attention when busy..\n");
1546                 return TAPE_IO_PENDING;
1547         }
1548
1549         DBF_EVENT(6, "xunknownirq\n");
1550         tape_dump_sense_dbf(device, request, irb);
1551         return TAPE_IO_STOP;
1552 }
1553
1554
1555 static int tape_3590_read_dev_chars(struct tape_device *device,
1556                                     struct tape_3590_rdc_data *rdc_data)
1557 {
1558         int rc;
1559         struct tape_request *request;
1560
1561         request = tape_alloc_request(1, sizeof(*rdc_data));
1562         if (IS_ERR(request))
1563                 return PTR_ERR(request);
1564         request->op = TO_RDC;
1565         tape_ccw_end(request->cpaddr, CCW_CMD_RDC, sizeof(*rdc_data),
1566                      request->cpdata);
1567         rc = tape_do_io(device, request);
1568         if (rc == 0)
1569                 memcpy(rdc_data, request->cpdata, sizeof(*rdc_data));
1570         tape_free_request(request);
1571         return rc;
1572 }
1573
1574 /*
1575  * Setup device function
1576  */
1577 static int
1578 tape_3590_setup_device(struct tape_device *device)
1579 {
1580         int rc;
1581         struct tape_3590_disc_data *data;
1582         struct tape_3590_rdc_data *rdc_data;
1583
1584         DBF_EVENT(6, "3590 device setup\n");
1585         data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
1586         if (data == NULL)
1587                 return -ENOMEM;
1588         data->read_back_op = READ_PREVIOUS;
1589         device->discdata = data;
1590
1591         rdc_data = kmalloc(sizeof(*rdc_data), GFP_KERNEL | GFP_DMA);
1592         if (!rdc_data) {
1593                 rc = -ENOMEM;
1594                 goto fail_kmalloc;
1595         }
1596         rc = tape_3590_read_dev_chars(device, rdc_data);
1597         if (rc) {
1598                 DBF_LH(3, "Read device characteristics failed!\n");
1599                 goto fail_rdc_data;
1600         }
1601         rc = tape_std_assign(device);
1602         if (rc)
1603                 goto fail_rdc_data;
1604         if (rdc_data->data[31] == 0x13) {
1605                 data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
1606                 tape_3592_disable_crypt(device);
1607         } else {
1608                 DBF_EVENT(6, "Device has NO crypto support\n");
1609         }
1610         /* Try to find out if medium is loaded */
1611         rc = tape_3590_sense_medium(device);
1612         if (rc) {
1613                 DBF_LH(3, "3590 medium sense returned %d\n", rc);
1614                 goto fail_rdc_data;
1615         }
1616         return 0;
1617
1618 fail_rdc_data:
1619         kfree(rdc_data);
1620 fail_kmalloc:
1621         kfree(data);
1622         return rc;
1623 }
1624
1625 /*
1626  * Cleanup device function
1627  */
1628 static void
1629 tape_3590_cleanup_device(struct tape_device *device)
1630 {
1631         flush_scheduled_work();
1632         tape_std_unassign(device);
1633
1634         kfree(device->discdata);
1635         device->discdata = NULL;
1636 }
1637
1638 /*
1639  * List of 3590 magnetic tape commands.
1640  */
1641 static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = {
1642         [MTRESET]        = tape_std_mtreset,
1643         [MTFSF]          = tape_std_mtfsf,
1644         [MTBSF]          = tape_std_mtbsf,
1645         [MTFSR]          = tape_std_mtfsr,
1646         [MTBSR]          = tape_std_mtbsr,
1647         [MTWEOF]         = tape_std_mtweof,
1648         [MTREW]          = tape_std_mtrew,
1649         [MTOFFL]         = tape_std_mtoffl,
1650         [MTNOP]          = tape_std_mtnop,
1651         [MTRETEN]        = tape_std_mtreten,
1652         [MTBSFM]         = tape_std_mtbsfm,
1653         [MTFSFM]         = tape_std_mtfsfm,
1654         [MTEOM]          = tape_std_mteom,
1655         [MTERASE]        = tape_std_mterase,
1656         [MTRAS1]         = NULL,
1657         [MTRAS2]         = NULL,
1658         [MTRAS3]         = NULL,
1659         [MTSETBLK]       = tape_std_mtsetblk,
1660         [MTSETDENSITY]   = NULL,
1661         [MTSEEK]         = tape_3590_mtseek,
1662         [MTTELL]         = tape_3590_mttell,
1663         [MTSETDRVBUFFER] = NULL,
1664         [MTFSS]          = NULL,
1665         [MTBSS]          = NULL,
1666         [MTWSM]          = NULL,
1667         [MTLOCK]         = NULL,
1668         [MTUNLOCK]       = NULL,
1669         [MTLOAD]         = tape_std_mtload,
1670         [MTUNLOAD]       = tape_std_mtunload,
1671         [MTCOMPRESSION]  = tape_std_mtcompression,
1672         [MTSETPART]      = NULL,
1673         [MTMKPART]       = NULL
1674 };
1675
1676 /*
1677  * Tape discipline structure for 3590.
1678  */
1679 static struct tape_discipline tape_discipline_3590 = {
1680         .owner = THIS_MODULE,
1681         .setup_device = tape_3590_setup_device,
1682         .cleanup_device = tape_3590_cleanup_device,
1683         .process_eov = tape_std_process_eov,
1684         .irq = tape_3590_irq,
1685         .read_block = tape_std_read_block,
1686         .write_block = tape_std_write_block,
1687 #ifdef CONFIG_S390_TAPE_BLOCK
1688         .bread = tape_3590_bread,
1689         .free_bread = tape_3590_free_bread,
1690         .check_locate = tape_3590_check_locate,
1691 #endif
1692         .ioctl_fn = tape_3590_ioctl,
1693         .mtop_array = tape_3590_mtop
1694 };
1695
1696 static struct ccw_device_id tape_3590_ids[] = {
1697         {CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590},
1698         {CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592},
1699         { /* end of list */ }
1700 };
1701
1702 static int
1703 tape_3590_online(struct ccw_device *cdev)
1704 {
1705         return tape_generic_online(dev_get_drvdata(&cdev->dev),
1706                                    &tape_discipline_3590);
1707 }
1708
1709 static struct ccw_driver tape_3590_driver = {
1710         .name = "tape_3590",
1711         .owner = THIS_MODULE,
1712         .ids = tape_3590_ids,
1713         .probe = tape_generic_probe,
1714         .remove = tape_generic_remove,
1715         .set_offline = tape_generic_offline,
1716         .set_online = tape_3590_online,
1717         .freeze = tape_generic_pm_suspend,
1718 };
1719
1720 /*
1721  * Setup discipline structure.
1722  */
1723 static int
1724 tape_3590_init(void)
1725 {
1726         int rc;
1727
1728         TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long));
1729         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1730 #ifdef DBF_LIKE_HELL
1731         debug_set_level(TAPE_DBF_AREA, 6);
1732 #endif
1733
1734         DBF_EVENT(3, "3590 init\n");
1735         /* Register driver for 3590 tapes. */
1736         rc = ccw_driver_register(&tape_3590_driver);
1737         if (rc)
1738                 DBF_EVENT(3, "3590 init failed\n");
1739         else
1740                 DBF_EVENT(3, "3590 registered\n");
1741         return rc;
1742 }
1743
1744 static void
1745 tape_3590_exit(void)
1746 {
1747         ccw_driver_unregister(&tape_3590_driver);
1748
1749         debug_unregister(TAPE_DBF_AREA);
1750 }
1751
1752 MODULE_DEVICE_TABLE(ccw, tape_3590_ids);
1753 MODULE_AUTHOR("(C) 2001,2006 IBM Corporation");
1754 MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver");
1755 MODULE_LICENSE("GPL");
1756
1757 module_init(tape_3590_init);
1758 module_exit(tape_3590_exit);