drivers/s390/block/dasd_3990_erp.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_3990_erp.c
   3  * Author(s)......: Horst  Hummel    <Horst.Hummel@de.ibm.com>
   4  *                  Holger Smolinski <Holger.Smolinski@de.ibm.com>
   5  * Bugreports.to..: <Linux390@de.ibm.com>
   6  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000, 2001
   7  *
   8  */
   9
  10 #define KMSG_COMPONENT "dasd-eckd"
  11
  12 #include <linux/timer.h>
  13 #include <asm/idals.h>
  14
  15 #define PRINTK_HEADER "dasd_erp(3990): "
  16
  17 #include "dasd_int.h"
  18 #include "dasd_eckd.h"
  19
  20
  21 struct DCTL_data {
  22         unsigned char subcommand;  /* e.g Inhibit Write, Enable Write,... */
  23         unsigned char modifier;    /* Subcommand modifier */
  24         unsigned short res;        /* reserved */
  25 } __attribute__ ((packed));
  26
  27 /*
  28  *****************************************************************************
  29  * SECTION ERP HANDLING
  30  *****************************************************************************
  31  */
  32 /*
  33  *****************************************************************************
  34  * 24 and 32 byte sense ERP functions
  35  *****************************************************************************
  36  */
  37
  38 /*
  39  * DASD_3990_ERP_CLEANUP
  40  *
  41  * DESCRIPTION
  42  *   Removes the already build but not necessary ERP request and sets
  43  *   the status of the original cqr / erp to the given (final) status
  44  *
  45  *  PARAMETER
  46  *   erp                request to be blocked
  47  *   final_status       either DASD_CQR_DONE or DASD_CQR_FAILED
  48  *
  49  * RETURN VALUES
  50  *   cqr                original cqr
  51  */
  52 static struct dasd_ccw_req *
  53 dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status)
  54 {
  55         struct dasd_ccw_req *cqr = erp->refers;
  56
  57         dasd_free_erp_request(erp, erp->memdev);
  58         cqr->status = final_status;
  59         return cqr;
  60
  61 }                               /* end dasd_3990_erp_cleanup */
  62
  63 /*
  64  * DASD_3990_ERP_BLOCK_QUEUE
  65  *
  66  * DESCRIPTION
  67  *   Block the given device request queue to prevent from further
  68  *   processing until the started timer has expired or an related
  69  *   interrupt was received.
  70  */
  71 static void dasd_3990_erp_block_queue(struct dasd_ccw_req *erp, int expires)
  72 {
  73
  74         struct dasd_device *device = erp->startdev;
  75         unsigned long flags;
  76
  77         DBF_DEV_EVENT(DBF_INFO, device,
  78                     "blocking request queue for %is", expires/HZ);
  79
  80         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
  81         dasd_device_set_stop_bits(device, DASD_STOPPED_PENDING);
  82         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
  83         erp->status = DASD_CQR_FILLED;
  84         if (erp->block)
  85                 dasd_block_set_timer(erp->block, expires);
  86         else
  87                 dasd_device_set_timer(device, expires);
  88 }
  89
  90 /*
  91  * DASD_3990_ERP_INT_REQ
  92  *
  93  * DESCRIPTION
  94  *   Handles 'Intervention Required' error.
  95  *   This means either device offline or not installed.
  96  *
  97  * PARAMETER
  98  *   erp                current erp
  99  * RETURN VALUES
 100  *   erp                modified erp
 101  */
 102 static struct dasd_ccw_req *
 103 dasd_3990_erp_int_req(struct dasd_ccw_req * erp)
 104 {
 105
 106         struct dasd_device *device = erp->startdev;
 107
 108         /* first time set initial retry counter and erp_function */
 109         /* and retry once without blocking queue                 */
 110         /* (this enables easier enqueing of the cqr)             */
 111         if (erp->function != dasd_3990_erp_int_req) {
 112
 113                 erp->retries = 256;
 114                 erp->function = dasd_3990_erp_int_req;
 115
 116         } else {
 117
 118                 /* issue a message and wait for 'device ready' interrupt */
 119                 dev_err(&device->cdev->dev,
 120                             "is offline or not installed - "
 121                             "INTERVENTION REQUIRED!!\n");
 122
 123                 dasd_3990_erp_block_queue(erp, 60*HZ);
 124         }
 125
 126         return erp;
 127
 128 }                               /* end dasd_3990_erp_int_req */
 129
 130 /*
 131  * DASD_3990_ERP_ALTERNATE_PATH
 132  *
 133  * DESCRIPTION
 134  *   Repeat the operation on a different channel path.
 135  *   If all alternate paths have been tried, the request is posted with a
 136  *   permanent error.
 137  *
 138  *  PARAMETER
 139  *   erp                pointer to the current ERP
 140  *
 141  * RETURN VALUES
 142  *   erp                modified pointer to the ERP
 143  */
 144 static void
 145 dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
 146 {
 147         struct dasd_device *device = erp->startdev;
 148         __u8 opm;
 149         unsigned long flags;
 150
 151         /* try alternate valid path */
 152         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 153         opm = ccw_device_get_path_mask(device->cdev);
 154         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 155         if (erp->lpm == 0)
 156                 erp->lpm = device->path_data.opm &
 157                         ~(erp->irb.esw.esw0.sublog.lpum);
 158         else
 159                 erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
 160
 161         if ((erp->lpm & opm) != 0x00) {
 162
 163                 DBF_DEV_EVENT(DBF_WARNING, device,
 164                             "try alternate lpm=%x (lpum=%x / opm=%x)",
 165                             erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm);
 166
 167                 /* reset status to submit the request again... */
 168                 erp->status = DASD_CQR_FILLED;
 169                 erp->retries = 10;
 170         } else {
 171                 dev_err(&device->cdev->dev,
 172                         "The DASD cannot be reached on any path (lpum=%x"
 173                         "/opm=%x)\n", erp->irb.esw.esw0.sublog.lpum, opm);
 174
 175                 /* post request with permanent error */
 176                 erp->status = DASD_CQR_FAILED;
 177         }
 178 }                               /* end dasd_3990_erp_alternate_path */
 179
 180 /*
 181  * DASD_3990_ERP_DCTL
 182  *
 183  * DESCRIPTION
 184  *   Setup cqr to do the Diagnostic Control (DCTL) command with an
 185  *   Inhibit Write subcommand (0x20) and the given modifier.
 186  *
 187  *  PARAMETER
 188  *   erp                pointer to the current (failed) ERP
 189  *   modifier           subcommand modifier
 190  *
 191  * RETURN VALUES
 192  *   dctl_cqr           pointer to NEW dctl_cqr
 193  *
 194  */
 195 static struct dasd_ccw_req *
 196 dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier)
 197 {
 198
 199         struct dasd_device *device = erp->startdev;
 200         struct DCTL_data *DCTL_data;
 201         struct ccw1 *ccw;
 202         struct dasd_ccw_req *dctl_cqr;
 203
 204         dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1,
 205                                           sizeof(struct DCTL_data),
 206                                           device);
 207         if (IS_ERR(dctl_cqr)) {
 208                 dev_err(&device->cdev->dev,
 209                             "Unable to allocate DCTL-CQR\n");
 210                 erp->status = DASD_CQR_FAILED;
 211                 return erp;
 212         }
 213
 214         DCTL_data = dctl_cqr->data;
 215
 216         DCTL_data->subcommand = 0x02;   /* Inhibit Write */
 217         DCTL_data->modifier = modifier;
 218
 219         ccw = dctl_cqr->cpaddr;
 220         memset(ccw, 0, sizeof(struct ccw1));
 221         ccw->cmd_code = CCW_CMD_DCTL;
 222         ccw->count = 4;
 223         ccw->cda = (__u32)(addr_t) DCTL_data;
 224         dctl_cqr->flags = erp->flags;
 225         dctl_cqr->function = dasd_3990_erp_DCTL;
 226         dctl_cqr->refers = erp;
 227         dctl_cqr->startdev = device;
 228         dctl_cqr->memdev = device;
 229         dctl_cqr->magic = erp->magic;
 230         dctl_cqr->expires = 5 * 60 * HZ;
 231         dctl_cqr->retries = 2;
 232
 233         dctl_cqr->buildclk = get_clock();
 234
 235         dctl_cqr->status = DASD_CQR_FILLED;
 236
 237         return dctl_cqr;
 238
 239 }                               /* end dasd_3990_erp_DCTL */
 240
 241 /*
 242  * DASD_3990_ERP_ACTION_1
 243  *
 244  * DESCRIPTION
 245  *   Setup ERP to do the ERP action 1 (see Reference manual).
 246  *   Repeat the operation on a different channel path.
 247  *   As deviation from the recommended recovery action, we reset the path mask
 248  *   after we have tried each path and go through all paths a second time.
 249  *   This will cover situations where only one path at a time is actually down,
 250  *   but all paths fail and recover just with the same sequence and timing as
 251  *   we try to use them (flapping links).
 252  *   If all alternate paths have been tried twice, the request is posted with
 253  *   a permanent error.
 254  *
 255  *  PARAMETER
 256  *   erp                pointer to the current ERP
 257  *
 258  * RETURN VALUES
 259  *   erp                pointer to the ERP
 260  *
 261  */
 262 static struct dasd_ccw_req *dasd_3990_erp_action_1_sec(struct dasd_ccw_req *erp)
 263 {
 264         erp->function = dasd_3990_erp_action_1_sec;
 265         dasd_3990_erp_alternate_path(erp);
 266         return erp;
 267 }
 268
 269 static struct dasd_ccw_req *dasd_3990_erp_action_1(struct dasd_ccw_req *erp)
 270 {
 271         erp->function = dasd_3990_erp_action_1;
 272         dasd_3990_erp_alternate_path(erp);
 273         if (erp->status == DASD_CQR_FAILED &&
 274             !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
 275                 erp->status = DASD_CQR_FILLED;
 276                 erp->retries = 10;
 277                 erp->lpm = erp->startdev->path_data.opm;
 278                 erp->function = dasd_3990_erp_action_1_sec;
 279         }
 280         return erp;
 281 }                               /* end dasd_3990_erp_action_1(b) */
 282
 283 /*
 284  * DASD_3990_ERP_ACTION_4
 285  *
 286  * DESCRIPTION
 287  *   Setup ERP to do the ERP action 4 (see Reference manual).
 288  *   Set the current request to PENDING to block the CQR queue for that device
 289  *   until the state change interrupt appears.
 290  *   Use a timer (20 seconds) to retry the cqr if the interrupt is still
 291  *   missing.
 292  *
 293  *  PARAMETER
 294  *   sense              sense data of the actual error
 295  *   erp                pointer to the current ERP
 296  *
 297  * RETURN VALUES
 298  *   erp                pointer to the ERP
 299  *
 300  */
 301 static struct dasd_ccw_req *
 302 dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense)
 303 {
 304
 305         struct dasd_device *device = erp->startdev;
 306
 307         /* first time set initial retry counter and erp_function    */
 308         /* and retry once without waiting for state change pending  */
 309         /* interrupt (this enables easier enqueing of the cqr)      */
 310         if (erp->function != dasd_3990_erp_action_4) {
 311
 312                 DBF_DEV_EVENT(DBF_INFO, device, "%s",
 313                             "dasd_3990_erp_action_4: first time retry");
 314
 315                 erp->retries = 256;
 316                 erp->function = dasd_3990_erp_action_4;
 317
 318         } else {
 319                 if (sense && (sense[25] == 0x1D)) { /* state change pending */
 320
 321                         DBF_DEV_EVENT(DBF_INFO, device,
 322                                     "waiting for state change pending "
 323                                     "interrupt, %d retries left",
 324                                     erp->retries);
 325
 326                         dasd_3990_erp_block_queue(erp, 30*HZ);
 327
 328                 } else if (sense && (sense[25] == 0x1E)) {      /* busy */
 329                         DBF_DEV_EVENT(DBF_INFO, device,
 330                                     "busy - redriving request later, "
 331                                     "%d retries left",
 332                                     erp->retries);
 333                         dasd_3990_erp_block_queue(erp, HZ);
 334                 } else {
 335                         /* no state change pending - retry */
 336                         DBF_DEV_EVENT(DBF_INFO, device,
 337                                      "redriving request immediately, "
 338                                      "%d retries left",
 339                                      erp->retries);
 340                         erp->status = DASD_CQR_FILLED;
 341                 }
 342         }
 343
 344         return erp;
 345
 346 }                               /* end dasd_3990_erp_action_4 */
 347
 348 /*
 349  *****************************************************************************
 350  * 24 byte sense ERP functions (only)
 351  *****************************************************************************
 352  */
 353
 354 /*
 355  * DASD_3990_ERP_ACTION_5
 356  *
 357  * DESCRIPTION
 358  *   Setup ERP to do the ERP action 5 (see Reference manual).
 359  *   NOTE: Further handling is done in xxx_further_erp after the retries.
 360  *
 361  *  PARAMETER
 362  *   erp                pointer to the current ERP
 363  *
 364  * RETURN VALUES
 365  *   erp                pointer to the ERP
 366  *
 367  */
 368 static struct dasd_ccw_req *
 369 dasd_3990_erp_action_5(struct dasd_ccw_req * erp)
 370 {
 371
 372         /* first of all retry */
 373         erp->retries = 10;
 374         erp->function = dasd_3990_erp_action_5;
 375
 376         return erp;
 377
 378 }                               /* end dasd_3990_erp_action_5 */
 379
 380 /*
 381  * DASD_3990_HANDLE_ENV_DATA
 382  *
 383  * DESCRIPTION
 384  *   Handles 24 byte 'Environmental data present'.
 385  *   Does a analysis of the sense data (message Format)
 386  *   and prints the error messages.
 387  *
 388  * PARAMETER
 389  *   sense              current sense data
 390  *
 391  * RETURN VALUES
 392  *   void
 393  */
 394 static void
 395 dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense)
 396 {
 397
 398         struct dasd_device *device = erp->startdev;
 399         char msg_format = (sense[7] & 0xF0);
 400         char msg_no = (sense[7] & 0x0F);
 401         char errorstring[ERRORLENGTH];
 402
 403         switch (msg_format) {
 404         case 0x00:              /* Format 0 - Program or System Checks */
 405
 406                 if (sense[1] & 0x10) {  /* check message to operator bit */
 407
 408                         switch (msg_no) {
 409                         case 0x00:      /* No Message */
 410                                 break;
 411                         case 0x01:
 412                                 dev_warn(&device->cdev->dev,
 413                                             "FORMAT 0 - Invalid Command\n");
 414                                 break;
 415                         case 0x02:
 416                                 dev_warn(&device->cdev->dev,
 417                                             "FORMAT 0 - Invalid Command "
 418                                             "Sequence\n");
 419                                 break;
 420                         case 0x03:
 421                                 dev_warn(&device->cdev->dev,
 422                                             "FORMAT 0 - CCW Count less than "
 423                                             "required\n");
 424                                 break;
 425                         case 0x04:
 426                                 dev_warn(&device->cdev->dev,
 427                                             "FORMAT 0 - Invalid Parameter\n");
 428                                 break;
 429                         case 0x05:
 430                                 dev_warn(&device->cdev->dev,
 431                                             "FORMAT 0 - Diagnostic of Special"
 432                                             " Command Violates File Mask\n");
 433                                 break;
 434                         case 0x07:
 435                                 dev_warn(&device->cdev->dev,
 436                                             "FORMAT 0 - Channel Returned with "
 437                                             "Incorrect retry CCW\n");
 438                                 break;
 439                         case 0x08:
 440                                 dev_warn(&device->cdev->dev,
 441                                             "FORMAT 0 - Reset Notification\n");
 442                                 break;
 443                         case 0x09:
 444                                 dev_warn(&device->cdev->dev,
 445                                          "FORMAT 0 - Storage Path Restart\n");
 446                                 break;
 447                         case 0x0A:
 448                                 dev_warn(&device->cdev->dev,
 449                                             "FORMAT 0 - Channel requested "
 450                                             "... %02x\n", sense[8]);
 451                                 break;
 452                         case 0x0B:
 453                                 dev_warn(&device->cdev->dev,
 454                                             "FORMAT 0 - Invalid Defective/"
 455                                             "Alternate Track Pointer\n");
 456                                 break;
 457                         case 0x0C:
 458                                 dev_warn(&device->cdev->dev,
 459                                             "FORMAT 0 - DPS Installation "
 460                                             "Check\n");
 461                                 break;
 462                         case 0x0E:
 463                                 dev_warn(&device->cdev->dev,
 464                                             "FORMAT 0 - Command Invalid on "
 465                                             "Secondary Address\n");
 466                                 break;
 467                         case 0x0F:
 468                                 dev_warn(&device->cdev->dev,
 469                                             "FORMAT 0 - Status Not As "
 470                                             "Required: reason %02x\n",
 471                                          sense[8]);
 472                                 break;
 473                         default:
 474                                 dev_warn(&device->cdev->dev,
 475                                             "FORMAT 0 - Reserved\n");
 476                         }
 477                 } else {
 478                         switch (msg_no) {
 479                         case 0x00:      /* No Message */
 480                                 break;
 481                         case 0x01:
 482                                 dev_warn(&device->cdev->dev,
 483                                          "FORMAT 0 - Device Error "
 484                                          "Source\n");
 485                                 break;
 486                         case 0x02:
 487                                 dev_warn(&device->cdev->dev,
 488                                             "FORMAT 0 - Reserved\n");
 489                                 break;
 490                         case 0x03:
 491                                 dev_warn(&device->cdev->dev,
 492                                             "FORMAT 0 - Device Fenced - "
 493                                             "device = %02x\n", sense[4]);
 494                                 break;
 495                         case 0x04:
 496                                 dev_warn(&device->cdev->dev,
 497                                             "FORMAT 0 - Data Pinned for "
 498                                             "Device\n");
 499                                 break;
 500                         default:
 501                                 dev_warn(&device->cdev->dev,
 502                                             "FORMAT 0 - Reserved\n");
 503                         }
 504                 }
 505                 break;
 506
 507         case 0x10:              /* Format 1 - Device Equipment Checks */
 508                 switch (msg_no) {
 509                 case 0x00:      /* No Message */
 510                         break;
 511                 case 0x01:
 512                         dev_warn(&device->cdev->dev,
 513                                     "FORMAT 1 - Device Status 1 not as "
 514                                     "expected\n");
 515                         break;
 516                 case 0x03:
 517                         dev_warn(&device->cdev->dev,
 518                                     "FORMAT 1 - Index missing\n");
 519                         break;
 520                 case 0x04:
 521                         dev_warn(&device->cdev->dev,
 522                                  "FORMAT 1 - Interruption cannot be "
 523                                  "reset\n");
 524                         break;
 525                 case 0x05:
 526                         dev_warn(&device->cdev->dev,
 527                                     "FORMAT 1 - Device did not respond to "
 528                                     "selection\n");
 529                         break;
 530                 case 0x06:
 531                         dev_warn(&device->cdev->dev,
 532                                     "FORMAT 1 - Device check-2 error or Set "
 533                                     "Sector is not complete\n");
 534                         break;
 535                 case 0x07:
 536                         dev_warn(&device->cdev->dev,
 537                                     "FORMAT 1 - Head address does not "
 538                                     "compare\n");
 539                         break;
 540                 case 0x08:
 541                         dev_warn(&device->cdev->dev,
 542                                     "FORMAT 1 - Device status 1 not valid\n");
 543                         break;
 544                 case 0x09:
 545                         dev_warn(&device->cdev->dev,
 546                                     "FORMAT 1 - Device not ready\n");
 547                         break;
 548                 case 0x0A:
 549                         dev_warn(&device->cdev->dev,
 550                                     "FORMAT 1 - Track physical address did "
 551                                     "not compare\n");
 552                         break;
 553                 case 0x0B:
 554                         dev_warn(&device->cdev->dev,
 555                                     "FORMAT 1 - Missing device address bit\n");
 556                         break;
 557                 case 0x0C:
 558                         dev_warn(&device->cdev->dev,
 559                                     "FORMAT 1 - Drive motor switch is off\n");
 560                         break;
 561                 case 0x0D:
 562                         dev_warn(&device->cdev->dev,
 563                                     "FORMAT 1 - Seek incomplete\n");
 564                         break;
 565                 case 0x0E:
 566                         dev_warn(&device->cdev->dev,
 567                                     "FORMAT 1 - Cylinder address did not "
 568                                     "compare\n");
 569                         break;
 570                 case 0x0F:
 571                         dev_warn(&device->cdev->dev,
 572                                     "FORMAT 1 - Offset active cannot be "
 573                                     "reset\n");
 574                         break;
 575                 default:
 576                         dev_warn(&device->cdev->dev,
 577                                     "FORMAT 1 - Reserved\n");
 578                 }
 579                 break;
 580
 581         case 0x20:              /* Format 2 - 3990 Equipment Checks */
 582                 switch (msg_no) {
 583                 case 0x08:
 584                         dev_warn(&device->cdev->dev,
 585                                     "FORMAT 2 - 3990 check-2 error\n");
 586                         break;
 587                 case 0x0E:
 588                         dev_warn(&device->cdev->dev,
 589                                     "FORMAT 2 - Support facility errors\n");
 590                         break;
 591                 case 0x0F:
 592                         dev_warn(&device->cdev->dev,
 593                                  "FORMAT 2 - Microcode detected error "
 594                                  "%02x\n",
 595                                  sense[8]);
 596                         break;
 597                 default:
 598                         dev_warn(&device->cdev->dev,
 599                                     "FORMAT 2 - Reserved\n");
 600                 }
 601                 break;
 602
 603         case 0x30:              /* Format 3 - 3990 Control Checks */
 604                 switch (msg_no) {
 605                 case 0x0F:
 606                         dev_warn(&device->cdev->dev,
 607                                     "FORMAT 3 - Allegiance terminated\n");
 608                         break;
 609                 default:
 610                         dev_warn(&device->cdev->dev,
 611                                     "FORMAT 3 - Reserved\n");
 612                 }
 613                 break;
 614
 615         case 0x40:              /* Format 4 - Data Checks */
 616                 switch (msg_no) {
 617                 case 0x00:
 618                         dev_warn(&device->cdev->dev,
 619                                     "FORMAT 4 - Home address area error\n");
 620                         break;
 621                 case 0x01:
 622                         dev_warn(&device->cdev->dev,
 623                                     "FORMAT 4 - Count area error\n");
 624                         break;
 625                 case 0x02:
 626                         dev_warn(&device->cdev->dev,
 627                                     "FORMAT 4 - Key area error\n");
 628                         break;
 629                 case 0x03:
 630                         dev_warn(&device->cdev->dev,
 631                                     "FORMAT 4 - Data area error\n");
 632                         break;
 633                 case 0x04:
 634                         dev_warn(&device->cdev->dev,
 635                                     "FORMAT 4 - No sync byte in home address "
 636                                     "area\n");
 637                         break;
 638                 case 0x05:
 639                         dev_warn(&device->cdev->dev,
 640                                     "FORMAT 4 - No sync byte in count address "
 641                                     "area\n");
 642                         break;
 643                 case 0x06:
 644                         dev_warn(&device->cdev->dev,
 645                                     "FORMAT 4 - No sync byte in key area\n");
 646                         break;
 647                 case 0x07:
 648                         dev_warn(&device->cdev->dev,
 649                                     "FORMAT 4 - No sync byte in data area\n");
 650                         break;
 651                 case 0x08:
 652                         dev_warn(&device->cdev->dev,
 653                                     "FORMAT 4 - Home address area error; "
 654                                     "offset active\n");
 655                         break;
 656                 case 0x09:
 657                         dev_warn(&device->cdev->dev,
 658                                     "FORMAT 4 - Count area error; offset "
 659                                     "active\n");
 660                         break;
 661                 case 0x0A:
 662                         dev_warn(&device->cdev->dev,
 663                                     "FORMAT 4 - Key area error; offset "
 664                                     "active\n");
 665                         break;
 666                 case 0x0B:
 667                         dev_warn(&device->cdev->dev,
 668                                     "FORMAT 4 - Data area error; "
 669                                     "offset active\n");
 670                         break;
 671                 case 0x0C:
 672                         dev_warn(&device->cdev->dev,
 673                                     "FORMAT 4 - No sync byte in home "
 674                                     "address area; offset active\n");
 675                         break;
 676                 case 0x0D:
 677                         dev_warn(&device->cdev->dev,
 678                                     "FORMAT 4 - No syn byte in count "
 679                                     "address area; offset active\n");
 680                         break;
 681                 case 0x0E:
 682                         dev_warn(&device->cdev->dev,
 683                                     "FORMAT 4 - No sync byte in key area; "
 684                                     "offset active\n");
 685                         break;
 686                 case 0x0F:
 687                         dev_warn(&device->cdev->dev,
 688                                     "FORMAT 4 - No syn byte in data area; "
 689                                     "offset active\n");
 690                         break;
 691                 default:
 692                         dev_warn(&device->cdev->dev,
 693                                     "FORMAT 4 - Reserved\n");
 694                 }
 695                 break;
 696
 697         case 0x50:  /* Format 5 - Data Check with displacement information */
 698                 switch (msg_no) {
 699                 case 0x00:
 700                         dev_warn(&device->cdev->dev,
 701                                     "FORMAT 5 - Data Check in the "
 702                                     "home address area\n");
 703                         break;
 704                 case 0x01:
 705                         dev_warn(&device->cdev->dev,
 706                                  "FORMAT 5 - Data Check in the count "
 707                                  "area\n");
 708                         break;
 709                 case 0x02:
 710                         dev_warn(&device->cdev->dev,
 711                                     "FORMAT 5 - Data Check in the key area\n");
 712                         break;
 713                 case 0x03:
 714                         dev_warn(&device->cdev->dev,
 715                                  "FORMAT 5 - Data Check in the data "
 716                                  "area\n");
 717                         break;
 718                 case 0x08:
 719                         dev_warn(&device->cdev->dev,
 720                                     "FORMAT 5 - Data Check in the "
 721                                     "home address area; offset active\n");
 722                         break;
 723                 case 0x09:
 724                         dev_warn(&device->cdev->dev,
 725                                     "FORMAT 5 - Data Check in the count area; "
 726                                     "offset active\n");
 727                         break;
 728                 case 0x0A:
 729                         dev_warn(&device->cdev->dev,
 730                                     "FORMAT 5 - Data Check in the key area; "
 731                                     "offset active\n");
 732                         break;
 733                 case 0x0B:
 734                         dev_warn(&device->cdev->dev,
 735                                     "FORMAT 5 - Data Check in the data area; "
 736                                     "offset active\n");
 737                         break;
 738                 default:
 739                         dev_warn(&device->cdev->dev,
 740                                     "FORMAT 5 - Reserved\n");
 741                 }
 742                 break;
 743
 744         case 0x60:  /* Format 6 - Usage Statistics/Overrun Errors */
 745                 switch (msg_no) {
 746                 case 0x00:
 747                         dev_warn(&device->cdev->dev,
 748                                     "FORMAT 6 - Overrun on channel A\n");
 749                         break;
 750                 case 0x01:
 751                         dev_warn(&device->cdev->dev,
 752                                     "FORMAT 6 - Overrun on channel B\n");
 753                         break;
 754                 case 0x02:
 755                         dev_warn(&device->cdev->dev,
 756                                     "FORMAT 6 - Overrun on channel C\n");
 757                         break;
 758                 case 0x03:
 759                         dev_warn(&device->cdev->dev,
 760                                     "FORMAT 6 - Overrun on channel D\n");
 761                         break;
 762                 case 0x04:
 763                         dev_warn(&device->cdev->dev,
 764                                     "FORMAT 6 - Overrun on channel E\n");
 765                         break;
 766                 case 0x05:
 767                         dev_warn(&device->cdev->dev,
 768                                     "FORMAT 6 - Overrun on channel F\n");
 769                         break;
 770                 case 0x06:
 771                         dev_warn(&device->cdev->dev,
 772                                     "FORMAT 6 - Overrun on channel G\n");
 773                         break;
 774                 case 0x07:
 775                         dev_warn(&device->cdev->dev,
 776                                     "FORMAT 6 - Overrun on channel H\n");
 777                         break;
 778                 default:
 779                         dev_warn(&device->cdev->dev,
 780                                     "FORMAT 6 - Reserved\n");
 781                 }
 782                 break;
 783
 784         case 0x70:  /* Format 7 - Device Connection Control Checks */
 785                 switch (msg_no) {
 786                 case 0x00:
 787                         dev_warn(&device->cdev->dev,
 788                                     "FORMAT 7 - RCC initiated by a connection "
 789                                     "check alert\n");
 790                         break;
 791                 case 0x01:
 792                         dev_warn(&device->cdev->dev,
 793                                     "FORMAT 7 - RCC 1 sequence not "
 794                                     "successful\n");
 795                         break;
 796                 case 0x02:
 797                         dev_warn(&device->cdev->dev,
 798                                     "FORMAT 7 - RCC 1 and RCC 2 sequences not "
 799                                     "successful\n");
 800                         break;
 801                 case 0x03:
 802                         dev_warn(&device->cdev->dev,
 803                                     "FORMAT 7 - Invalid tag-in during "
 804                                     "selection sequence\n");
 805                         break;
 806                 case 0x04:
 807                         dev_warn(&device->cdev->dev,
 808                                     "FORMAT 7 - extra RCC required\n");
 809                         break;
 810                 case 0x05:
 811                         dev_warn(&device->cdev->dev,
 812                                     "FORMAT 7 - Invalid DCC selection "
 813                                     "response or timeout\n");
 814                         break;
 815                 case 0x06:
 816                         dev_warn(&device->cdev->dev,
 817                                     "FORMAT 7 - Missing end operation; device "
 818                                     "transfer complete\n");
 819                         break;
 820                 case 0x07:
 821                         dev_warn(&device->cdev->dev,
 822                                     "FORMAT 7 - Missing end operation; device "
 823                                     "transfer incomplete\n");
 824                         break;
 825                 case 0x08:
 826                         dev_warn(&device->cdev->dev,
 827                                     "FORMAT 7 - Invalid tag-in for an "
 828                                     "immediate command sequence\n");
 829                         break;
 830                 case 0x09:
 831                         dev_warn(&device->cdev->dev,
 832                                     "FORMAT 7 - Invalid tag-in for an "
 833                                     "extended command sequence\n");
 834                         break;
 835                 case 0x0A:
 836                         dev_warn(&device->cdev->dev,
 837                                     "FORMAT 7 - 3990 microcode time out when "
 838                                     "stopping selection\n");
 839                         break;
 840                 case 0x0B:
 841                         dev_warn(&device->cdev->dev,
 842                                     "FORMAT 7 - No response to selection "
 843                                     "after a poll interruption\n");
 844                         break;
 845                 case 0x0C:
 846                         dev_warn(&device->cdev->dev,
 847                                     "FORMAT 7 - Permanent path error (DASD "
 848                                     "controller not available)\n");
 849                         break;
 850                 case 0x0D:
 851                         dev_warn(&device->cdev->dev,
 852                                     "FORMAT 7 - DASD controller not available"
 853                                     " on disconnected command chain\n");
 854                         break;
 855                 default:
 856                         dev_warn(&device->cdev->dev,
 857                                     "FORMAT 7 - Reserved\n");
 858                 }
 859                 break;
 860
 861         case 0x80:  /* Format 8 - Additional Device Equipment Checks */
 862                 switch (msg_no) {
 863                 case 0x00:      /* No Message */
 864                 case 0x01:
 865                         dev_warn(&device->cdev->dev,
 866                                     "FORMAT 8 - Error correction code "
 867                                     "hardware fault\n");
 868                         break;
 869                 case 0x03:
 870                         dev_warn(&device->cdev->dev,
 871                                     "FORMAT 8 - Unexpected end operation "
 872                                     "response code\n");
 873                         break;
 874                 case 0x04:
 875                         dev_warn(&device->cdev->dev,
 876                                     "FORMAT 8 - End operation with transfer "
 877                                     "count not zero\n");
 878                         break;
 879                 case 0x05:
 880                         dev_warn(&device->cdev->dev,
 881                                     "FORMAT 8 - End operation with transfer "
 882                                     "count zero\n");
 883                         break;
 884                 case 0x06:
 885                         dev_warn(&device->cdev->dev,
 886                                     "FORMAT 8 - DPS checks after a system "
 887                                     "reset or selective reset\n");
 888                         break;
 889                 case 0x07:
 890                         dev_warn(&device->cdev->dev,
 891                                     "FORMAT 8 - DPS cannot be filled\n");
 892                         break;
 893                 case 0x08:
 894                         dev_warn(&device->cdev->dev,
 895                                     "FORMAT 8 - Short busy time-out during "
 896                                     "device selection\n");
 897                         break;
 898                 case 0x09:
 899                         dev_warn(&device->cdev->dev,
 900                                     "FORMAT 8 - DASD controller failed to "
 901                                     "set or reset the long busy latch\n");
 902                         break;
 903                 case 0x0A:
 904                         dev_warn(&device->cdev->dev,
 905                                     "FORMAT 8 - No interruption from device "
 906                                     "during a command chain\n");
 907                         break;
 908                 default:
 909                         dev_warn(&device->cdev->dev,
 910                                     "FORMAT 8 - Reserved\n");
 911                 }
 912                 break;
 913
 914         case 0x90:  /* Format 9 - Device Read, Write, and Seek Checks */
 915                 switch (msg_no) {
 916                 case 0x00:
 917                         break;  /* No Message */
 918                 case 0x06:
 919                         dev_warn(&device->cdev->dev,
 920                                     "FORMAT 9 - Device check-2 error\n");
 921                         break;
 922                 case 0x07:
 923                         dev_warn(&device->cdev->dev,
 924                                  "FORMAT 9 - Head address did not "
 925                                  "compare\n");
 926                         break;
 927                 case 0x0A:
 928                         dev_warn(&device->cdev->dev,
 929                                     "FORMAT 9 - Track physical address did "
 930                                     "not compare while oriented\n");
 931                         break;
 932                 case 0x0E:
 933                         dev_warn(&device->cdev->dev,
 934                                     "FORMAT 9 - Cylinder address did not "
 935                                     "compare\n");
 936                         break;
 937                 default:
 938                         dev_warn(&device->cdev->dev,
 939                                     "FORMAT 9 - Reserved\n");
 940                 }
 941                 break;
 942
 943         case 0xF0:              /* Format F - Cache Storage Checks */
 944                 switch (msg_no) {
 945                 case 0x00:
 946                         dev_warn(&device->cdev->dev,
 947                                     "FORMAT F - Operation Terminated\n");
 948                         break;
 949                 case 0x01:
 950                         dev_warn(&device->cdev->dev,
 951                                     "FORMAT F - Subsystem Processing Error\n");
 952                         break;
 953                 case 0x02:
 954                         dev_warn(&device->cdev->dev,
 955                                     "FORMAT F - Cache or nonvolatile storage "
 956                                     "equipment failure\n");
 957                         break;
 958                 case 0x04:
 959                         dev_warn(&device->cdev->dev,
 960                                     "FORMAT F - Caching terminated\n");
 961                         break;
 962                 case 0x06:
 963                         dev_warn(&device->cdev->dev,
 964                                     "FORMAT F - Cache fast write access not "
 965                                     "authorized\n");
 966                         break;
 967                 case 0x07:
 968                         dev_warn(&device->cdev->dev,
 969                                     "FORMAT F - Track format incorrect\n");
 970                         break;
 971                 case 0x09:
 972                         dev_warn(&device->cdev->dev,
 973                                     "FORMAT F - Caching reinitiated\n");
 974                         break;
 975                 case 0x0A:
 976                         dev_warn(&device->cdev->dev,
 977                                     "FORMAT F - Nonvolatile storage "
 978                                     "terminated\n");
 979                         break;
 980                 case 0x0B:
 981                         dev_warn(&device->cdev->dev,
 982                                     "FORMAT F - Volume is suspended duplex\n");
 983                         /* call extended error reporting (EER) */
 984                         dasd_eer_write(device, erp->refers,
 985                                        DASD_EER_PPRCSUSPEND);
 986                         break;
 987                 case 0x0C:
 988                         dev_warn(&device->cdev->dev,
 989                                     "FORMAT F - Subsystem status cannot be "
 990                                     "determined\n");
 991                         break;
 992                 case 0x0D:
 993                         dev_warn(&device->cdev->dev,
 994                                     "FORMAT F - Caching status reset to "
 995                                     "default\n");
 996                         break;
 997                 case 0x0E:
 998                         dev_warn(&device->cdev->dev,
 999                                     "FORMAT F - DASD Fast Write inhibited\n");
1000                         break;
1001                 default:
1002                         dev_warn(&device->cdev->dev,
1003                                     "FORMAT D - Reserved\n");
1004                 }
1005                 break;
1006
1007         default:        /* unknown message format - should not happen
1008                            internal error 03 - unknown message format */
1009                 snprintf(errorstring, ERRORLENGTH, "03 %x02", msg_format);
1010                 dev_err(&device->cdev->dev,
1011                          "An error occurred in the DASD device driver, "
1012                          "reason=%s\n", errorstring);
1013                 break;
1014         }                       /* end switch message format */
1015
1016 }                               /* end dasd_3990_handle_env_data */
1017
1018 /*
1019  * DASD_3990_ERP_COM_REJ
1020  *
1021  * DESCRIPTION
1022  *   Handles 24 byte 'Command Reject' error.
1023  *
1024  * PARAMETER
1025  *   erp                current erp_head
1026  *   sense              current sense data
1027  *
1028  * RETURN VALUES
1029  *   erp                'new' erp_head - pointer to new ERP
1030  */
1031 static struct dasd_ccw_req *
1032 dasd_3990_erp_com_rej(struct dasd_ccw_req * erp, char *sense)
1033 {
1034
1035         struct dasd_device *device = erp->startdev;
1036
1037         erp->function = dasd_3990_erp_com_rej;
1038
1039         /* env data present (ACTION 10 - retry should work) */
1040         if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1041
1042                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1043                             "Command Reject - environmental data present");
1044
1045                 dasd_3990_handle_env_data(erp, sense);
1046
1047                 erp->retries = 5;
1048
1049         } else if (sense[1] & SNS1_WRITE_INHIBITED) {
1050                 dev_err(&device->cdev->dev, "An I/O request was rejected"
1051                         " because writing is inhibited\n");
1052                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1053         } else {
1054                 /* fatal error -  set status to FAILED
1055                    internal error 09 - Command Reject */
1056                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1057                         "device driver, reason=%s\n", "09");
1058
1059                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1060         }
1061
1062         return erp;
1063
1064 }                               /* end dasd_3990_erp_com_rej */
1065
1066 /*
1067  * DASD_3990_ERP_BUS_OUT
1068  *
1069  * DESCRIPTION
1070  *   Handles 24 byte 'Bus Out Parity Check' error.
1071  *
1072  * PARAMETER
1073  *   erp                current erp_head
1074  * RETURN VALUES
1075  *   erp                new erp_head - pointer to new ERP
1076  */
1077 static struct dasd_ccw_req *
1078 dasd_3990_erp_bus_out(struct dasd_ccw_req * erp)
1079 {
1080
1081         struct dasd_device *device = erp->startdev;
1082
1083         /* first time set initial retry counter and erp_function */
1084         /* and retry once without blocking queue                 */
1085         /* (this enables easier enqueing of the cqr)             */
1086         if (erp->function != dasd_3990_erp_bus_out) {
1087                 erp->retries = 256;
1088                 erp->function = dasd_3990_erp_bus_out;
1089
1090         } else {
1091
1092                 /* issue a message and wait for 'device ready' interrupt */
1093                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1094                             "bus out parity error or BOPC requested by "
1095                             "channel");
1096
1097                 dasd_3990_erp_block_queue(erp, 60*HZ);
1098
1099         }
1100
1101         return erp;
1102
1103 }                               /* end dasd_3990_erp_bus_out */
1104
1105 /*
1106  * DASD_3990_ERP_EQUIP_CHECK
1107  *
1108  * DESCRIPTION
1109  *   Handles 24 byte 'Equipment Check' error.
1110  *
1111  * PARAMETER
1112  *   erp                current erp_head
1113  * RETURN VALUES
1114  *   erp                new erp_head - pointer to new ERP
1115  */
1116 static struct dasd_ccw_req *
1117 dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense)
1118 {
1119
1120         struct dasd_device *device = erp->startdev;
1121
1122         erp->function = dasd_3990_erp_equip_check;
1123
1124         if (sense[1] & SNS1_WRITE_INHIBITED) {
1125                 dev_info(&device->cdev->dev,
1126                             "Write inhibited path encountered\n");
1127
1128                 /* vary path offline
1129                    internal error 04 - Path should be varied off-line.*/
1130                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1131                         "device driver, reason=%s\n", "04");
1132
1133                 erp = dasd_3990_erp_action_1(erp);
1134
1135         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1136
1137                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1138                             "Equipment Check - " "environmental data present");
1139
1140                 dasd_3990_handle_env_data(erp, sense);
1141
1142                 erp = dasd_3990_erp_action_4(erp, sense);
1143
1144         } else if (sense[1] & SNS1_PERM_ERR) {
1145
1146                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1147                             "Equipment Check - retry exhausted or "
1148                             "undesirable");
1149
1150                 erp = dasd_3990_erp_action_1(erp);
1151
1152         } else {
1153                 /* all other equipment checks - Action 5 */
1154                 /* rest is done when retries == 0 */
1155                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1156                             "Equipment check or processing error");
1157
1158                 erp = dasd_3990_erp_action_5(erp);
1159         }
1160         return erp;
1161
1162 }                               /* end dasd_3990_erp_equip_check */
1163
1164 /*
1165  * DASD_3990_ERP_DATA_CHECK
1166  *
1167  * DESCRIPTION
1168  *   Handles 24 byte 'Data Check' error.
1169  *
1170  * PARAMETER
1171  *   erp                current erp_head
1172  * RETURN VALUES
1173  *   erp                new erp_head - pointer to new ERP
1174  */
1175 static struct dasd_ccw_req *
1176 dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense)
1177 {
1178
1179         struct dasd_device *device = erp->startdev;
1180
1181         erp->function = dasd_3990_erp_data_check;
1182
1183         if (sense[2] & SNS2_CORRECTABLE) {      /* correctable data check */
1184
1185                 /* issue message that the data has been corrected */
1186                 dev_emerg(&device->cdev->dev,
1187                             "Data recovered during retry with PCI "
1188                             "fetch mode active\n");
1189
1190                 /* not possible to handle this situation in Linux */
1191                 panic("No way to inform application about the possibly "
1192                       "incorrect data");
1193
1194         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1195
1196                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1197                             "Uncorrectable data check recovered secondary "
1198                             "addr of duplex pair");
1199
1200                 erp = dasd_3990_erp_action_4(erp, sense);
1201
1202         } else if (sense[1] & SNS1_PERM_ERR) {
1203
1204                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1205                             "Uncorrectable data check with internal "
1206                             "retry exhausted");
1207
1208                 erp = dasd_3990_erp_action_1(erp);
1209
1210         } else {
1211                 /* all other data checks */
1212                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1213                             "Uncorrectable data check with retry count "
1214                             "exhausted...");
1215
1216                 erp = dasd_3990_erp_action_5(erp);
1217         }
1218
1219         return erp;
1220
1221 }                               /* end dasd_3990_erp_data_check */
1222
1223 /*
1224  * DASD_3990_ERP_OVERRUN
1225  *
1226  * DESCRIPTION
1227  *   Handles 24 byte 'Overrun' error.
1228  *
1229  * PARAMETER
1230  *   erp                current erp_head
1231  * RETURN VALUES
1232  *   erp                new erp_head - pointer to new ERP
1233  */
1234 static struct dasd_ccw_req *
1235 dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense)
1236 {
1237
1238         struct dasd_device *device = erp->startdev;
1239
1240         erp->function = dasd_3990_erp_overrun;
1241
1242         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1243                     "Overrun - service overrun or overrun"
1244                     " error requested by channel");
1245
1246         erp = dasd_3990_erp_action_5(erp);
1247
1248         return erp;
1249
1250 }                               /* end dasd_3990_erp_overrun */
1251
1252 /*
1253  * DASD_3990_ERP_INV_FORMAT
1254  *
1255  * DESCRIPTION
1256  *   Handles 24 byte 'Invalid Track Format' error.
1257  *
1258  * PARAMETER
1259  *   erp                current erp_head
1260  * RETURN VALUES
1261  *   erp                new erp_head - pointer to new ERP
1262  */
1263 static struct dasd_ccw_req *
1264 dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense)
1265 {
1266
1267         struct dasd_device *device = erp->startdev;
1268
1269         erp->function = dasd_3990_erp_inv_format;
1270
1271         if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1272
1273                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1274                             "Track format error when destaging or "
1275                             "staging data");
1276
1277                 dasd_3990_handle_env_data(erp, sense);
1278
1279                 erp = dasd_3990_erp_action_4(erp, sense);
1280
1281         } else {
1282                 /* internal error 06 - The track format is not valid*/
1283                 dev_err(&device->cdev->dev,
1284                         "An error occurred in the DASD device driver, "
1285                         "reason=%s\n", "06");
1286
1287                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1288         }
1289
1290         return erp;
1291
1292 }                               /* end dasd_3990_erp_inv_format */
1293
1294 /*
1295  * DASD_3990_ERP_EOC
1296  *
1297  * DESCRIPTION
1298  *   Handles 24 byte 'End-of-Cylinder' error.
1299  *
1300  * PARAMETER
1301  *   erp                already added default erp
1302  * RETURN VALUES
1303  *   erp                pointer to original (failed) cqr.
1304  */
1305 static struct dasd_ccw_req *
1306 dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense)
1307 {
1308
1309         struct dasd_device *device = default_erp->startdev;
1310
1311         dev_err(&device->cdev->dev,
1312                 "The cylinder data for accessing the DASD is inconsistent\n");
1313
1314         /* implement action 7 - BUG */
1315         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1316
1317 }                               /* end dasd_3990_erp_EOC */
1318
1319 /*
1320  * DASD_3990_ERP_ENV_DATA
1321  *
1322  * DESCRIPTION
1323  *   Handles 24 byte 'Environmental-Data Present' error.
1324  *
1325  * PARAMETER
1326  *   erp                current erp_head
1327  * RETURN VALUES
1328  *   erp                new erp_head - pointer to new ERP
1329  */
1330 static struct dasd_ccw_req *
1331 dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense)
1332 {
1333
1334         struct dasd_device *device = erp->startdev;
1335
1336         erp->function = dasd_3990_erp_env_data;
1337
1338         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Environmental data present");
1339
1340         dasd_3990_handle_env_data(erp, sense);
1341
1342         /* don't retry on disabled interface */
1343         if (sense[7] != 0x0F) {
1344                 erp = dasd_3990_erp_action_4(erp, sense);
1345         } else {
1346                 erp->status = DASD_CQR_FILLED;
1347         }
1348
1349         return erp;
1350
1351 }                               /* end dasd_3990_erp_env_data */
1352
1353 /*
1354  * DASD_3990_ERP_NO_REC
1355  *
1356  * DESCRIPTION
1357  *   Handles 24 byte 'No Record Found' error.
1358  *
1359  * PARAMETER
1360  *   erp                already added default ERP
1361  *
1362  * RETURN VALUES
1363  *   erp                new erp_head - pointer to new ERP
1364  */
1365 static struct dasd_ccw_req *
1366 dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense)
1367 {
1368
1369         struct dasd_device *device = default_erp->startdev;
1370
1371         dev_err(&device->cdev->dev,
1372                     "The specified record was not found\n");
1373
1374         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1375
1376 }                               /* end dasd_3990_erp_no_rec */
1377
1378 /*
1379  * DASD_3990_ERP_FILE_PROT
1380  *
1381  * DESCRIPTION
1382  *   Handles 24 byte 'File Protected' error.
1383  *   Note: Seek related recovery is not implemented because
1384  *         wee don't use the seek command yet.
1385  *
1386  * PARAMETER
1387  *   erp                current erp_head
1388  * RETURN VALUES
1389  *   erp                new erp_head - pointer to new ERP
1390  */
1391 static struct dasd_ccw_req *
1392 dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
1393 {
1394
1395         struct dasd_device *device = erp->startdev;
1396
1397         dev_err(&device->cdev->dev, "Accessing the DASD failed because of "
1398                 "a hardware error\n");
1399
1400         return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1401
1402 }                               /* end dasd_3990_erp_file_prot */
1403
1404 /*
1405  * DASD_3990_ERP_INSPECT_ALIAS
1406  *
1407  * DESCRIPTION
1408  *   Checks if the original request was started on an alias device.
1409  *   If yes, it modifies the original and the erp request so that
1410  *   the erp request can be started on a base device.
1411  *
1412  * PARAMETER
1413  *   erp                pointer to the currently created default ERP
1414  *
1415  * RETURN VALUES
1416  *   erp                pointer to the modified ERP, or NULL
1417  */
1418
1419 static struct dasd_ccw_req *dasd_3990_erp_inspect_alias(
1420                                                 struct dasd_ccw_req *erp)
1421 {
1422         struct dasd_ccw_req *cqr = erp->refers;
1423         char *sense;
1424
1425         if (cqr->block &&
1426             (cqr->block->base != cqr->startdev)) {
1427
1428                 sense = dasd_get_sense(&erp->refers->irb);
1429                 /*
1430                  * dynamic pav may have changed base alias mapping
1431                  */
1432                 if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense
1433                     && (sense[0] == 0x10) && (sense[7] == 0x0F)
1434                     && (sense[8] == 0x67)) {
1435                         /*
1436                          * remove device from alias handling to prevent new
1437                          * requests from being scheduled on the
1438                          * wrong alias device
1439                          */
1440                         dasd_alias_remove_device(cqr->startdev);
1441
1442                         /* schedule worker to reload device */
1443                         dasd_reload_device(cqr->startdev);
1444                 }
1445
1446                 if (cqr->startdev->features & DASD_FEATURE_ERPLOG) {
1447                         DBF_DEV_EVENT(DBF_ERR, cqr->startdev,
1448                                     "ERP on alias device for request %p,"
1449                                     " recover on base device %s", cqr,
1450                                     dev_name(&cqr->block->base->cdev->dev));
1451                 }
1452                 dasd_eckd_reset_ccw_to_base_io(cqr);
1453                 erp->startdev = cqr->block->base;
1454                 erp->function = dasd_3990_erp_inspect_alias;
1455                 return erp;
1456         } else
1457                 return NULL;
1458 }
1459
1460
1461 /*
1462  * DASD_3990_ERP_INSPECT_24
1463  *
1464  * DESCRIPTION
1465  *   Does a detailed inspection of the 24 byte sense data
1466  *   and sets up a related error recovery action.
1467  *
1468  * PARAMETER
1469  *   sense              sense data of the actual error
1470  *   erp                pointer to the currently created default ERP
1471  *
1472  * RETURN VALUES
1473  *   erp                pointer to the (addtitional) ERP
1474  */
1475 static struct dasd_ccw_req *
1476 dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense)
1477 {
1478
1479         struct dasd_ccw_req *erp_filled = NULL;
1480
1481         /* Check sense for ....    */
1482         /* 'Command Reject'        */
1483         if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) {
1484                 erp_filled = dasd_3990_erp_com_rej(erp, sense);
1485         }
1486         /* 'Intervention Required' */
1487         if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) {
1488                 erp_filled = dasd_3990_erp_int_req(erp);
1489         }
1490         /* 'Bus Out Parity Check'  */
1491         if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) {
1492                 erp_filled = dasd_3990_erp_bus_out(erp);
1493         }
1494         /* 'Equipment Check'       */
1495         if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) {
1496                 erp_filled = dasd_3990_erp_equip_check(erp, sense);
1497         }
1498         /* 'Data Check'            */
1499         if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) {
1500                 erp_filled = dasd_3990_erp_data_check(erp, sense);
1501         }
1502         /* 'Overrun'               */
1503         if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) {
1504                 erp_filled = dasd_3990_erp_overrun(erp, sense);
1505         }
1506         /* 'Invalid Track Format'  */
1507         if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) {
1508                 erp_filled = dasd_3990_erp_inv_format(erp, sense);
1509         }
1510         /* 'End-of-Cylinder'       */
1511         if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) {
1512                 erp_filled = dasd_3990_erp_EOC(erp, sense);
1513         }
1514         /* 'Environmental Data'    */
1515         if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) {
1516                 erp_filled = dasd_3990_erp_env_data(erp, sense);
1517         }
1518         /* 'No Record Found'       */
1519         if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) {
1520                 erp_filled = dasd_3990_erp_no_rec(erp, sense);
1521         }
1522         /* 'File Protected'        */
1523         if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) {
1524                 erp_filled = dasd_3990_erp_file_prot(erp);
1525         }
1526         /* other (unknown) error - do default ERP */
1527         if (erp_filled == NULL) {
1528
1529                 erp_filled = erp;
1530         }
1531
1532         return erp_filled;
1533
1534 }                               /* END dasd_3990_erp_inspect_24 */
1535
1536 /*
1537  *****************************************************************************
1538  * 32 byte sense ERP functions (only)
1539  *****************************************************************************
1540  */
1541
1542 /*
1543  * DASD_3990_ERPACTION_10_32
1544  *
1545  * DESCRIPTION
1546  *   Handles 32 byte 'Action 10' of Single Program Action Codes.
1547  *   Just retry and if retry doesn't work, return with error.
1548  *
1549  * PARAMETER
1550  *   erp                current erp_head
1551  *   sense              current sense data
1552  * RETURN VALUES
1553  *   erp                modified erp_head
1554  */
1555 static struct dasd_ccw_req *
1556 dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense)
1557 {
1558
1559         struct dasd_device *device = erp->startdev;
1560
1561         erp->retries = 256;
1562         erp->function = dasd_3990_erp_action_10_32;
1563
1564         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Perform logging requested");
1565
1566         return erp;
1567
1568 }                               /* end dasd_3990_erp_action_10_32 */
1569
1570 /*
1571  * DASD_3990_ERP_ACTION_1B_32
1572  *
1573  * DESCRIPTION
1574  *   Handles 32 byte 'Action 1B' of Single Program Action Codes.
1575  *   A write operation could not be finished because of an unexpected
1576  *   condition.
1577  *   The already created 'default erp' is used to get the link to
1578  *   the erp chain, but it can not be used for this recovery
1579  *   action because it contains no DE/LO data space.
1580  *
1581  * PARAMETER
1582  *   default_erp        already added default erp.
1583  *   sense              current sense data
1584  *
1585  * RETURN VALUES
1586  *   erp                new erp or
1587  *                      default_erp in case of imprecise ending or error
1588  */
1589 static struct dasd_ccw_req *
1590 dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
1591 {
1592
1593         struct dasd_device *device = default_erp->startdev;
1594         __u32 cpa = 0;
1595         struct dasd_ccw_req *cqr;
1596         struct dasd_ccw_req *erp;
1597         struct DE_eckd_data *DE_data;
1598         struct PFX_eckd_data *PFX_data;
1599         char *LO_data;          /* LO_eckd_data_t */
1600         struct ccw1 *ccw, *oldccw;
1601
1602         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1603                     "Write not finished because of unexpected condition");
1604
1605         default_erp->function = dasd_3990_erp_action_1B_32;
1606
1607         /* determine the original cqr */
1608         cqr = default_erp;
1609
1610         while (cqr->refers != NULL) {
1611                 cqr = cqr->refers;
1612         }
1613
1614         if (scsw_is_tm(&cqr->irb.scsw)) {
1615                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1616                               "32 bit sense, action 1B is not defined"
1617                               " in transport mode - just retry");
1618                 return default_erp;
1619         }
1620
1621         /* for imprecise ending just do default erp */
1622         if (sense[1] & 0x01) {
1623                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1624                             "Imprecise ending is set - just retry");
1625
1626                 return default_erp;
1627         }
1628
1629         /* determine the address of the CCW to be restarted */
1630         /* Imprecise ending is not set -> addr from IRB-SCSW */
1631         cpa = default_erp->refers->irb.scsw.cmd.cpa;
1632
1633         if (cpa == 0) {
1634                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1635                             "Unable to determine address of the CCW "
1636                             "to be restarted");
1637
1638                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1639         }
1640
1641         /* Build new ERP request including DE/LO */
1642         erp = dasd_alloc_erp_request((char *) &cqr->magic,
1643                                      2 + 1,/* DE/LO + TIC */
1644                                      sizeof(struct DE_eckd_data) +
1645                                      sizeof(struct LO_eckd_data), device);
1646
1647         if (IS_ERR(erp)) {
1648                 /* internal error 01 - Unable to allocate ERP */
1649                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1650                         "device driver, reason=%s\n", "01");
1651                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1652         }
1653
1654         /* use original DE */
1655         DE_data = erp->data;
1656         oldccw = cqr->cpaddr;
1657         if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) {
1658                 PFX_data = cqr->data;
1659                 memcpy(DE_data, &PFX_data->define_extent,
1660                        sizeof(struct DE_eckd_data));
1661         } else
1662                 memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data));
1663
1664         /* create LO */
1665         LO_data = erp->data + sizeof(struct DE_eckd_data);
1666
1667         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1668                 /* should not */
1669                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1670         }
1671
1672         if ((sense[7] & 0x3F) == 0x01) {
1673                 /* operation code is WRITE DATA -> data area orientation */
1674                 LO_data[0] = 0x81;
1675
1676         } else if ((sense[7] & 0x3F) == 0x03) {
1677                 /* operation code is FORMAT WRITE -> index orientation */
1678                 LO_data[0] = 0xC3;
1679
1680         } else {
1681                 LO_data[0] = sense[7];  /* operation */
1682         }
1683
1684         LO_data[1] = sense[8];  /* auxiliary */
1685         LO_data[2] = sense[9];
1686         LO_data[3] = sense[3];  /* count */
1687         LO_data[4] = sense[29]; /* seek_addr.cyl */
1688         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1689         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1690
1691         memcpy(&(LO_data[8]), &(sense[11]), 8);
1692
1693         /* create DE ccw */
1694         ccw = erp->cpaddr;
1695         memset(ccw, 0, sizeof(struct ccw1));
1696         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
1697         ccw->flags = CCW_FLAG_CC;
1698         ccw->count = 16;
1699         ccw->cda = (__u32)(addr_t) DE_data;
1700
1701         /* create LO ccw */
1702         ccw++;
1703         memset(ccw, 0, sizeof(struct ccw1));
1704         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
1705         ccw->flags = CCW_FLAG_CC;
1706         ccw->count = 16;
1707         ccw->cda = (__u32)(addr_t) LO_data;
1708
1709         /* TIC to the failed ccw */
1710         ccw++;
1711         ccw->cmd_code = CCW_CMD_TIC;
1712         ccw->cda = cpa;
1713
1714         /* fill erp related fields */
1715         erp->flags = default_erp->flags;
1716         erp->function = dasd_3990_erp_action_1B_32;
1717         erp->refers = default_erp->refers;
1718         erp->startdev = device;
1719         erp->memdev = device;
1720         erp->magic = default_erp->magic;
1721         erp->expires = 0;
1722         erp->retries = 256;
1723         erp->buildclk = get_clock();
1724         erp->status = DASD_CQR_FILLED;
1725
1726         /* remove the default erp */
1727         dasd_free_erp_request(default_erp, device);
1728
1729         return erp;
1730
1731 }                               /* end dasd_3990_erp_action_1B_32 */
1732
1733 /*
1734  * DASD_3990_UPDATE_1B
1735  *
1736  * DESCRIPTION
1737  *   Handles the update to the 32 byte 'Action 1B' of Single Program
1738  *   Action Codes in case the first action was not successful.
1739  *   The already created 'previous_erp' is the currently not successful
1740  *   ERP.
1741  *
1742  * PARAMETER
1743  *   previous_erp       already created previous erp.
1744  *   sense              current sense data
1745  * RETURN VALUES
1746  *   erp                modified erp
1747  */
1748 static struct dasd_ccw_req *
1749 dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense)
1750 {
1751
1752         struct dasd_device *device = previous_erp->startdev;
1753         __u32 cpa = 0;
1754         struct dasd_ccw_req *cqr;
1755         struct dasd_ccw_req *erp;
1756         char *LO_data;          /* struct LO_eckd_data */
1757         struct ccw1 *ccw;
1758
1759         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1760                     "Write not finished because of unexpected condition"
1761                     " - follow on");
1762
1763         /* determine the original cqr */
1764         cqr = previous_erp;
1765
1766         while (cqr->refers != NULL) {
1767                 cqr = cqr->refers;
1768         }
1769
1770         if (scsw_is_tm(&cqr->irb.scsw)) {
1771                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1772                               "32 bit sense, action 1B, update,"
1773                               " in transport mode - just retry");
1774                 return previous_erp;
1775         }
1776
1777         /* for imprecise ending just do default erp */
1778         if (sense[1] & 0x01) {
1779                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1780                             "Imprecise ending is set - just retry");
1781
1782                 previous_erp->status = DASD_CQR_FILLED;
1783
1784                 return previous_erp;
1785         }
1786
1787         /* determine the address of the CCW to be restarted */
1788         /* Imprecise ending is not set -> addr from IRB-SCSW */
1789         cpa = previous_erp->irb.scsw.cmd.cpa;
1790
1791         if (cpa == 0) {
1792                 /* internal error 02 -
1793                    Unable to determine address of the CCW to be restarted */
1794                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1795                         "device driver, reason=%s\n", "02");
1796
1797                 previous_erp->status = DASD_CQR_FAILED;
1798
1799                 return previous_erp;
1800         }
1801
1802         erp = previous_erp;
1803
1804         /* update the LO with the new returned sense data  */
1805         LO_data = erp->data + sizeof(struct DE_eckd_data);
1806
1807         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1808                 /* should not happen */
1809                 previous_erp->status = DASD_CQR_FAILED;
1810
1811                 return previous_erp;
1812         }
1813
1814         if ((sense[7] & 0x3F) == 0x01) {
1815                 /* operation code is WRITE DATA -> data area orientation */
1816                 LO_data[0] = 0x81;
1817
1818         } else if ((sense[7] & 0x3F) == 0x03) {
1819                 /* operation code is FORMAT WRITE -> index orientation */
1820                 LO_data[0] = 0xC3;
1821
1822         } else {
1823                 LO_data[0] = sense[7];  /* operation */
1824         }
1825
1826         LO_data[1] = sense[8];  /* auxiliary */
1827         LO_data[2] = sense[9];
1828         LO_data[3] = sense[3];  /* count */
1829         LO_data[4] = sense[29]; /* seek_addr.cyl */
1830         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1831         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1832
1833         memcpy(&(LO_data[8]), &(sense[11]), 8);
1834
1835         /* TIC to the failed ccw */
1836         ccw = erp->cpaddr;      /* addr of DE ccw */
1837         ccw++;                  /* addr of LE ccw */
1838         ccw++;                  /* addr of TIC ccw */
1839         ccw->cda = cpa;
1840
1841         erp->status = DASD_CQR_FILLED;
1842
1843         return erp;
1844
1845 }                               /* end dasd_3990_update_1B */
1846
1847 /*
1848  * DASD_3990_ERP_COMPOUND_RETRY
1849  *
1850  * DESCRIPTION
1851  *   Handles the compound ERP action retry code.
1852  *   NOTE: At least one retry is done even if zero is specified
1853  *         by the sense data. This makes enqueueing of the request
1854  *         easier.
1855  *
1856  * PARAMETER
1857  *   sense              sense data of the actual error
1858  *   erp                pointer to the currently created ERP
1859  *
1860  * RETURN VALUES
1861  *   erp                modified ERP pointer
1862  *
1863  */
1864 static void
1865 dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
1866 {
1867
1868         switch (sense[25] & 0x03) {
1869         case 0x00:              /* no not retry */
1870                 erp->retries = 1;
1871                 break;
1872
1873         case 0x01:              /* retry 2 times */
1874                 erp->retries = 2;
1875                 break;
1876
1877         case 0x02:              /* retry 10 times */
1878                 erp->retries = 10;
1879                 break;
1880
1881         case 0x03:              /* retry 256 times */
1882                 erp->retries = 256;
1883                 break;
1884
1885         default:
1886                 BUG();
1887         }
1888
1889         erp->function = dasd_3990_erp_compound_retry;
1890
1891 }                               /* end dasd_3990_erp_compound_retry */
1892
1893 /*
1894  * DASD_3990_ERP_COMPOUND_PATH
1895  *
1896  * DESCRIPTION
1897  *   Handles the compound ERP action for retry on alternate
1898  *   channel path.
1899  *
1900  * PARAMETER
1901  *   sense              sense data of the actual error
1902  *   erp                pointer to the currently created ERP
1903  *
1904  * RETURN VALUES
1905  *   erp                modified ERP pointer
1906  *
1907  */
1908 static void
1909 dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
1910 {
1911         if (sense[25] & DASD_SENSE_BIT_3) {
1912                 dasd_3990_erp_alternate_path(erp);
1913
1914                 if (erp->status == DASD_CQR_FAILED &&
1915                     !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
1916                         /* reset the lpm and the status to be able to
1917                          * try further actions. */
1918                         erp->lpm = erp->startdev->path_data.opm;
1919                         erp->status = DASD_CQR_NEED_ERP;
1920                 }
1921         }
1922
1923         erp->function = dasd_3990_erp_compound_path;
1924
1925 }                               /* end dasd_3990_erp_compound_path */
1926
1927 /*
1928  * DASD_3990_ERP_COMPOUND_CODE
1929  *
1930  * DESCRIPTION
1931  *   Handles the compound ERP action for retry code.
1932  *
1933  * PARAMETER
1934  *   sense              sense data of the actual error
1935  *   erp                pointer to the currently created ERP
1936  *
1937  * RETURN VALUES
1938  *   erp                NEW ERP pointer
1939  *
1940  */
1941 static struct dasd_ccw_req *
1942 dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense)
1943 {
1944
1945         if (sense[25] & DASD_SENSE_BIT_2) {
1946
1947                 switch (sense[28]) {
1948                 case 0x17:
1949                         /* issue a Diagnostic Control command with an
1950                          * Inhibit Write subcommand and controller modifier */
1951                         erp = dasd_3990_erp_DCTL(erp, 0x20);
1952                         break;
1953
1954                 case 0x25:
1955                         /* wait for 5 seconds and retry again */
1956                         erp->retries = 1;
1957
1958                         dasd_3990_erp_block_queue (erp, 5*HZ);
1959                         break;
1960
1961                 default:
1962                         /* should not happen - continue */
1963                         break;
1964                 }
1965         }
1966
1967         erp->function = dasd_3990_erp_compound_code;
1968
1969         return erp;
1970
1971 }                               /* end dasd_3990_erp_compound_code */
1972
1973 /*
1974  * DASD_3990_ERP_COMPOUND_CONFIG
1975  *
1976  * DESCRIPTION
1977  *   Handles the compound ERP action for configruation
1978  *   dependent error.
1979  *   Note: duplex handling is not implemented (yet).
1980  *
1981  * PARAMETER
1982  *   sense              sense data of the actual error
1983  *   erp                pointer to the currently created ERP
1984  *
1985  * RETURN VALUES
1986  *   erp                modified ERP pointer
1987  *
1988  */
1989 static void
1990 dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense)
1991 {
1992
1993         if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) {
1994
1995                 /* set to suspended duplex state then restart
1996                    internal error 05 - Set device to suspended duplex state
1997                    should be done */
1998                 struct dasd_device *device = erp->startdev;
1999                 dev_err(&device->cdev->dev,
2000                         "An error occurred in the DASD device driver, "
2001                         "reason=%s\n", "05");
2002
2003         }
2004
2005         erp->function = dasd_3990_erp_compound_config;
2006
2007 }                               /* end dasd_3990_erp_compound_config */
2008
2009 /*
2010  * DASD_3990_ERP_COMPOUND
2011  *
2012  * DESCRIPTION
2013  *   Does the further compound program action if
2014  *   compound retry was not successful.
2015  *
2016  * PARAMETER
2017  *   sense              sense data of the actual error
2018  *   erp                pointer to the current (failed) ERP
2019  *
2020  * RETURN VALUES
2021  *   erp                (additional) ERP pointer
2022  *
2023  */
2024 static struct dasd_ccw_req *
2025 dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense)
2026 {
2027
2028         if ((erp->function == dasd_3990_erp_compound_retry) &&
2029             (erp->status == DASD_CQR_NEED_ERP)) {
2030
2031                 dasd_3990_erp_compound_path(erp, sense);
2032         }
2033
2034         if ((erp->function == dasd_3990_erp_compound_path) &&
2035             (erp->status == DASD_CQR_NEED_ERP)) {
2036
2037                 erp = dasd_3990_erp_compound_code(erp, sense);
2038         }
2039
2040         if ((erp->function == dasd_3990_erp_compound_code) &&
2041             (erp->status == DASD_CQR_NEED_ERP)) {
2042
2043                 dasd_3990_erp_compound_config(erp, sense);
2044         }
2045
2046         /* if no compound action ERP specified, the request failed */
2047         if (erp->status == DASD_CQR_NEED_ERP)
2048                 erp->status = DASD_CQR_FAILED;
2049
2050         return erp;
2051
2052 }                               /* end dasd_3990_erp_compound */
2053
2054 /*
2055  *DASD_3990_ERP_HANDLE_SIM
2056  *
2057  *DESCRIPTION
2058  *  inspects the SIM SENSE data and starts an appropriate action
2059  *
2060  * PARAMETER
2061  *   sense         sense data of the actual error
2062  *
2063  * RETURN VALUES
2064  *   none
2065  */
2066 void
2067 dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense)
2068 {
2069         /* print message according to log or message to operator mode */
2070         if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) {
2071                 /* print SIM SRC from RefCode */
2072                 dev_err(&device->cdev->dev, "SIM - SRC: "
2073                             "%02x%02x%02x%02x\n", sense[22],
2074                             sense[23], sense[11], sense[12]);
2075         } else if (sense[24] & DASD_SIM_LOG) {
2076                 /* print SIM SRC Refcode */
2077                 dev_warn(&device->cdev->dev, "log SIM - SRC: "
2078                             "%02x%02x%02x%02x\n", sense[22],
2079                             sense[23], sense[11], sense[12]);
2080         }
2081 }
2082
2083 /*
2084  * DASD_3990_ERP_INSPECT_32
2085  *
2086  * DESCRIPTION
2087  *   Does a detailed inspection of the 32 byte sense data
2088  *   and sets up a related error recovery action.
2089  *
2090  * PARAMETER
2091  *   sense              sense data of the actual error
2092  *   erp                pointer to the currently created default ERP
2093  *
2094  * RETURN VALUES
2095  *   erp_filled         pointer to the ERP
2096  *
2097  */
2098 static struct dasd_ccw_req *
2099 dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
2100 {
2101
2102         struct dasd_device *device = erp->startdev;
2103
2104         erp->function = dasd_3990_erp_inspect_32;
2105
2106         /* check for SIM sense data */
2107         if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)
2108                 dasd_3990_erp_handle_sim(device, sense);
2109
2110         if (sense[25] & DASD_SENSE_BIT_0) {
2111
2112                 /* compound program action codes (byte25 bit 0 == '1') */
2113                 dasd_3990_erp_compound_retry(erp, sense);
2114
2115         } else {
2116
2117                 /* single program action codes (byte25 bit 0 == '0') */
2118                 switch (sense[25]) {
2119
2120                 case 0x00:      /* success - use default ERP for retries */
2121                         DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
2122                                     "ERP called for successful request"
2123                                     " - just retry");
2124                         break;
2125
2126                 case 0x01:      /* fatal error */
2127                         dev_err(&device->cdev->dev,
2128                                     "ERP failed for the DASD\n");
2129
2130                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2131                         break;
2132
2133                 case 0x02:      /* intervention required */
2134                 case 0x03:      /* intervention required during dual copy */
2135                         erp = dasd_3990_erp_int_req(erp);
2136                         break;
2137
2138                 case 0x0F:  /* length mismatch during update write command
2139                                internal error 08 - update write command error*/
2140                         dev_err(&device->cdev->dev, "An error occurred in the "
2141                                 "DASD device driver, reason=%s\n", "08");
2142
2143                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2144                         break;
2145
2146                 case 0x10:  /* logging required for other channel program */
2147                         erp = dasd_3990_erp_action_10_32(erp, sense);
2148                         break;
2149
2150                 case 0x15:      /* next track outside defined extend
2151                                    internal error 07 - The next track is not
2152                                    within the defined storage extent */
2153                         dev_err(&device->cdev->dev,
2154                                 "An error occurred in the DASD device driver, "
2155                                 "reason=%s\n", "07");
2156
2157                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2158                         break;
2159
2160                 case 0x1B:      /* unexpected condition during write */
2161
2162                         erp = dasd_3990_erp_action_1B_32(erp, sense);
2163                         break;
2164
2165                 case 0x1C:      /* invalid data */
2166                         dev_emerg(&device->cdev->dev,
2167                                     "Data recovered during retry with PCI "
2168                                     "fetch mode active\n");
2169
2170                         /* not possible to handle this situation in Linux */
2171                         panic
2172                             ("Invalid data - No way to inform application "
2173                              "about the possibly incorrect data");
2174                         break;
2175
2176                 case 0x1D:      /* state-change pending */
2177                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2178                                     "A State change pending condition exists "
2179                                     "for the subsystem or device");
2180
2181                         erp = dasd_3990_erp_action_4(erp, sense);
2182                         break;
2183
2184                 case 0x1E:      /* busy */
2185                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2186                                     "Busy condition exists "
2187                                     "for the subsystem or device");
2188                         erp = dasd_3990_erp_action_4(erp, sense);
2189                         break;
2190
2191                 default:        /* all others errors - default erp  */
2192                         break;
2193                 }
2194         }
2195
2196         return erp;
2197
2198 }                               /* end dasd_3990_erp_inspect_32 */
2199
2200 /*
2201  *****************************************************************************
2202  * main ERP control functions (24 and 32 byte sense)
2203  *****************************************************************************
2204  */
2205
2206 /*
2207  * DASD_3990_ERP_CONTROL_CHECK
2208  *
2209  * DESCRIPTION
2210  *   Does a generic inspection if a control check occurred and sets up
2211  *   the related error recovery procedure
2212  *
2213  * PARAMETER
2214  *   erp                pointer to the currently created default ERP
2215  *
2216  * RETURN VALUES
2217  *   erp_filled         pointer to the erp
2218  */
2219
2220 static struct dasd_ccw_req *
2221 dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
2222 {
2223         struct dasd_device *device = erp->startdev;
2224
2225         if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK
2226                                            | SCHN_STAT_CHN_CTRL_CHK)) {
2227                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2228                             "channel or interface control check");
2229                 erp = dasd_3990_erp_action_4(erp, NULL);
2230         }
2231         return erp;
2232 }
2233
2234 /*
2235  * DASD_3990_ERP_INSPECT
2236  *
2237  * DESCRIPTION
2238  *   Does a detailed inspection for sense data by calling either
2239  *   the 24-byte or the 32-byte inspection routine.
2240  *
2241  * PARAMETER
2242  *   erp                pointer to the currently created default ERP
2243  * RETURN VALUES
2244  *   erp_new            contens was possibly modified
2245  */
2246 static struct dasd_ccw_req *
2247 dasd_3990_erp_inspect(struct dasd_ccw_req *erp)
2248 {
2249
2250         struct dasd_ccw_req *erp_new = NULL;
2251         char *sense;
2252
2253         /* if this problem occurred on an alias retry on base */
2254         erp_new = dasd_3990_erp_inspect_alias(erp);
2255         if (erp_new)
2256                 return erp_new;
2257
2258         /* sense data are located in the refers record of the
2259          * already set up new ERP !
2260          * check if concurrent sens is available
2261          */
2262         sense = dasd_get_sense(&erp->refers->irb);
2263         if (!sense)
2264                 erp_new = dasd_3990_erp_control_check(erp);
2265         /* distinguish between 24 and 32 byte sense data */
2266         else if (sense[27] & DASD_SENSE_BIT_0) {
2267
2268                 /* inspect the 24 byte sense data */
2269                 erp_new = dasd_3990_erp_inspect_24(erp, sense);
2270
2271         } else {
2272
2273                 /* inspect the 32 byte sense data */
2274                 erp_new = dasd_3990_erp_inspect_32(erp, sense);
2275
2276         }       /* end distinguish between 24 and 32 byte sense data */
2277
2278         return erp_new;
2279 }
2280
2281 /*
2282  * DASD_3990_ERP_ADD_ERP
2283  *
2284  * DESCRIPTION
2285  *   This function adds an additional request block (ERP) to the head of
2286  *   the given cqr (or erp).
2287  *   For a command mode cqr the erp is initialized as an default erp
2288  *   (retry TIC).
2289  *   For transport mode we make a copy of the original TCW (points to
2290  *   the original TCCB, TIDALs, etc.) but give it a fresh
2291  *   TSB so the original sense data will not be changed.
2292  *
2293  * PARAMETER
2294  *   cqr                head of the current ERP-chain (or single cqr if
2295  *                      first error)
2296  * RETURN VALUES
2297  *   erp                pointer to new ERP-chain head
2298  */
2299 static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr)
2300 {
2301
2302         struct dasd_device *device = cqr->startdev;
2303         struct ccw1 *ccw;
2304         struct dasd_ccw_req *erp;
2305         int cplength, datasize;
2306         struct tcw *tcw;
2307         struct tsb *tsb;
2308
2309         if (cqr->cpmode == 1) {
2310                 cplength = 0;
2311                 /* TCW needs to be 64 byte aligned, so leave enough room */
2312                 datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb);
2313         } else {
2314                 cplength = 2;
2315                 datasize = 0;
2316         }
2317
2318         /* allocate additional request block */
2319         erp = dasd_alloc_erp_request((char *) &cqr->magic,
2320                                      cplength, datasize, device);
2321         if (IS_ERR(erp)) {
2322                 if (cqr->retries <= 0) {
2323                         DBF_DEV_EVENT(DBF_ERR, device, "%s",
2324                                     "Unable to allocate ERP request");
2325                         cqr->status = DASD_CQR_FAILED;
2326                         cqr->stopclk = get_clock ();
2327                 } else {
2328                         DBF_DEV_EVENT(DBF_ERR, device,
2329                                      "Unable to allocate ERP request "
2330                                      "(%i retries left)",
2331                                      cqr->retries);
2332                         dasd_block_set_timer(device->block, (HZ << 3));
2333                 }
2334                 return erp;
2335         }
2336
2337         ccw = cqr->cpaddr;
2338         if (cqr->cpmode == 1) {
2339                 /* make a shallow copy of the original tcw but set new tsb */
2340                 erp->cpmode = 1;
2341                 erp->cpaddr = PTR_ALIGN(erp->data, 64);
2342                 tcw = erp->cpaddr;
2343                 tsb = (struct tsb *) &tcw[1];
2344                 *tcw = *((struct tcw *)cqr->cpaddr);
2345                 tcw->tsb = (long)tsb;
2346         } else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) {
2347                 /* PSF cannot be chained from NOOP/TIC */
2348                 erp->cpaddr = cqr->cpaddr;
2349         } else {
2350                 /* initialize request with default TIC to current ERP/CQR */
2351                 ccw = erp->cpaddr;
2352                 ccw->cmd_code = CCW_CMD_NOOP;
2353                 ccw->flags = CCW_FLAG_CC;
2354                 ccw++;
2355                 ccw->cmd_code = CCW_CMD_TIC;
2356                 ccw->cda      = (long)(cqr->cpaddr);
2357         }
2358
2359         erp->flags = cqr->flags;
2360         erp->function = dasd_3990_erp_add_erp;
2361         erp->refers   = cqr;
2362         erp->startdev = device;
2363         erp->memdev   = device;
2364         erp->block    = cqr->block;
2365         erp->magic    = cqr->magic;
2366         erp->expires  = 0;
2367         erp->retries  = 256;
2368         erp->buildclk = get_clock();
2369         erp->status = DASD_CQR_FILLED;
2370
2371         return erp;
2372 }
2373
2374 /*
2375  * DASD_3990_ERP_ADDITIONAL_ERP
2376  *
2377  * DESCRIPTION
2378  *   An additional ERP is needed to handle the current error.
2379  *   Add ERP to the head of the ERP-chain containing the ERP processing
2380  *   determined based on the sense data.
2381  *
2382  * PARAMETER
2383  *   cqr                head of the current ERP-chain (or single cqr if
2384  *                      first error)
2385  *
2386  * RETURN VALUES
2387  *   erp                pointer to new ERP-chain head
2388  */
2389 static struct dasd_ccw_req *
2390 dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr)
2391 {
2392
2393         struct dasd_ccw_req *erp = NULL;
2394
2395         /* add erp and initialize with default TIC */
2396         erp = dasd_3990_erp_add_erp(cqr);
2397
2398         if (IS_ERR(erp))
2399                 return erp;
2400
2401         /* inspect sense, determine specific ERP if possible */
2402         if (erp != cqr) {
2403
2404                 erp = dasd_3990_erp_inspect(erp);
2405         }
2406
2407         return erp;
2408
2409 }                               /* end dasd_3990_erp_additional_erp */
2410
2411 /*
2412  * DASD_3990_ERP_ERROR_MATCH
2413  *
2414  * DESCRIPTION
2415  *   Check if the device status of the given cqr is the same.
2416  *   This means that the failed CCW and the relevant sense data
2417  *   must match.
2418  *   I don't distinguish between 24 and 32 byte sense because in case of
2419  *   24 byte sense byte 25 and 27 is set as well.
2420  *
2421  * PARAMETER
2422  *   cqr1               first cqr, which will be compared with the
2423  *   cqr2               second cqr.
2424  *
2425  * RETURN VALUES
2426  *   match              'boolean' for match found
2427  *                      returns 1 if match found, otherwise 0.
2428  */
2429 static int dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1,
2430                                      struct dasd_ccw_req *cqr2)
2431 {
2432         char *sense1, *sense2;
2433
2434         if (cqr1->startdev != cqr2->startdev)
2435                 return 0;
2436
2437         sense1 = dasd_get_sense(&cqr1->irb);
2438         sense2 = dasd_get_sense(&cqr2->irb);
2439
2440         /* one request has sense data, the other not -> no match, return 0 */
2441         if (!sense1 != !sense2)
2442                 return 0;
2443         /* no sense data in both cases -> check cstat for IFCC */
2444         if (!sense1 && !sense2) {
2445                 if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2446                                                     SCHN_STAT_CHN_CTRL_CHK)) ==
2447                     (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2448                                                     SCHN_STAT_CHN_CTRL_CHK)))
2449                         return 1; /* match with ifcc*/
2450         }
2451         /* check sense data; byte 0-2,25,27 */
2452         if (!(sense1 && sense2 &&
2453               (memcmp(sense1, sense2, 3) == 0) &&
2454               (sense1[27] == sense2[27]) &&
2455               (sense1[25] == sense2[25]))) {
2456
2457                 return 0;       /* sense doesn't match */
2458         }
2459
2460         return 1;               /* match */
2461
2462 }                               /* end dasd_3990_erp_error_match */
2463
2464 /*
2465  * DASD_3990_ERP_IN_ERP
2466  *
2467  * DESCRIPTION
2468  *   check if the current error already happened before.
2469  *   quick exit if current cqr is not an ERP (cqr->refers=NULL)
2470  *
2471  * PARAMETER
2472  *   cqr                failed cqr (either original cqr or already an erp)
2473  *
2474  * RETURN VALUES
2475  *   erp                erp-pointer to the already defined error
2476  *                      recovery procedure OR
2477  *                      NULL if a 'new' error occurred.
2478  */
2479 static struct dasd_ccw_req *
2480 dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr)
2481 {
2482
2483         struct dasd_ccw_req *erp_head = cqr,    /* save erp chain head */
2484         *erp_match = NULL;      /* save erp chain head */
2485         int match = 0;          /* 'boolean' for matching error found */
2486
2487         if (cqr->refers == NULL) {      /* return if not in erp */
2488                 return NULL;
2489         }
2490
2491         /* check the erp/cqr chain for current error */
2492         do {
2493                 match = dasd_3990_erp_error_match(erp_head, cqr->refers);
2494                 erp_match = cqr;        /* save possible matching erp  */
2495                 cqr = cqr->refers;      /* check next erp/cqr in queue */
2496
2497         } while ((cqr->refers != NULL) && (!match));
2498
2499         if (!match) {
2500                 return NULL;    /* no match was found */
2501         }
2502
2503         return erp_match;       /* return address of matching erp */
2504
2505 }                               /* END dasd_3990_erp_in_erp */
2506
2507 /*
2508  * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
2509  *
2510  * DESCRIPTION
2511  *   No retry is left for the current ERP. Check what has to be done
2512  *   with the ERP.
2513  *     - do further defined ERP action or
2514  *     - wait for interrupt or
2515  *     - exit with permanent error
2516  *
2517  * PARAMETER
2518  *   erp                ERP which is in progress with no retry left
2519  *
2520  * RETURN VALUES
2521  *   erp                modified/additional ERP
2522  */
2523 static struct dasd_ccw_req *
2524 dasd_3990_erp_further_erp(struct dasd_ccw_req *erp)
2525 {
2526
2527         struct dasd_device *device = erp->startdev;
2528         char *sense = dasd_get_sense(&erp->irb);
2529
2530         /* check for 24 byte sense ERP */
2531         if ((erp->function == dasd_3990_erp_bus_out) ||
2532             (erp->function == dasd_3990_erp_action_1) ||
2533             (erp->function == dasd_3990_erp_action_4)) {
2534
2535                 erp = dasd_3990_erp_action_1(erp);
2536
2537         } else if (erp->function == dasd_3990_erp_action_1_sec) {
2538                 erp = dasd_3990_erp_action_1_sec(erp);
2539         } else if (erp->function == dasd_3990_erp_action_5) {
2540
2541                 /* retries have not been successful */
2542                 /* prepare erp for retry on different channel path */
2543                 erp = dasd_3990_erp_action_1(erp);
2544
2545                 if (sense && !(sense[2] & DASD_SENSE_BIT_0)) {
2546
2547                         /* issue a Diagnostic Control command with an
2548                          * Inhibit Write subcommand */
2549
2550                         switch (sense[25]) {
2551                         case 0x17:
2552                         case 0x57:{     /* controller */
2553                                         erp = dasd_3990_erp_DCTL(erp, 0x20);
2554                                         break;
2555                                 }
2556                         case 0x18:
2557                         case 0x58:{     /* channel path */
2558                                         erp = dasd_3990_erp_DCTL(erp, 0x40);
2559                                         break;
2560                                 }
2561                         case 0x19:
2562                         case 0x59:{     /* storage director */
2563                                         erp = dasd_3990_erp_DCTL(erp, 0x80);
2564                                         break;
2565                                 }
2566                         default:
2567                                 DBF_DEV_EVENT(DBF_WARNING, device,
2568                                             "invalid subcommand modifier 0x%x "
2569                                             "for Diagnostic Control Command",
2570                                             sense[25]);
2571                         }
2572                 }
2573
2574                 /* check for 32 byte sense ERP */
2575         } else if (sense &&
2576                    ((erp->function == dasd_3990_erp_compound_retry) ||
2577                     (erp->function == dasd_3990_erp_compound_path) ||
2578                     (erp->function == dasd_3990_erp_compound_code) ||
2579                     (erp->function == dasd_3990_erp_compound_config))) {
2580
2581                 erp = dasd_3990_erp_compound(erp, sense);
2582
2583         } else {
2584                 /*
2585                  * No retry left and no additional special handling
2586                  * necessary
2587                  */
2588                 dev_err(&device->cdev->dev,
2589                         "ERP %p has run out of retries and failed\n", erp);
2590
2591                 erp->status = DASD_CQR_FAILED;
2592         }
2593
2594         return erp;
2595
2596 }                               /* end dasd_3990_erp_further_erp */
2597
2598 /*
2599  * DASD_3990_ERP_HANDLE_MATCH_ERP
2600  *
2601  * DESCRIPTION
2602  *   An error occurred again and an ERP has been detected which is already
2603  *   used to handle this error (e.g. retries).
2604  *   All prior ERP's are asumed to be successful and therefore removed
2605  *   from queue.
2606  *   If retry counter of matching erp is already 0, it is checked if further
2607  *   action is needed (besides retry) or if the ERP has failed.
2608  *
2609  * PARAMETER
2610  *   erp_head           first ERP in ERP-chain
2611  *   erp                ERP that handles the actual error.
2612  *                      (matching erp)
2613  *
2614  * RETURN VALUES
2615  *   erp                modified/additional ERP
2616  */
2617 static struct dasd_ccw_req *
2618 dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head,
2619                                struct dasd_ccw_req *erp)
2620 {
2621
2622         struct dasd_device *device = erp_head->startdev;
2623         struct dasd_ccw_req *erp_done = erp_head;       /* finished req */
2624         struct dasd_ccw_req *erp_free = NULL;   /* req to be freed */
2625
2626         /* loop over successful ERPs and remove them from chanq */
2627         while (erp_done != erp) {
2628
2629                 if (erp_done == NULL)   /* end of chain reached */
2630                         panic(PRINTK_HEADER "Programming error in ERP! The "
2631                               "original request was lost\n");
2632
2633                 /* remove the request from the device queue */
2634                 list_del(&erp_done->blocklist);
2635
2636                 erp_free = erp_done;
2637                 erp_done = erp_done->refers;
2638
2639                 /* free the finished erp request */
2640                 dasd_free_erp_request(erp_free, erp_free->memdev);
2641
2642         }                       /* end while */
2643
2644         if (erp->retries > 0) {
2645
2646                 char *sense = dasd_get_sense(&erp->refers->irb);
2647
2648                 /* check for special retries */
2649                 if (sense && erp->function == dasd_3990_erp_action_4) {
2650
2651                         erp = dasd_3990_erp_action_4(erp, sense);
2652
2653                 } else if (sense &&
2654                            erp->function == dasd_3990_erp_action_1B_32) {
2655
2656                         erp = dasd_3990_update_1B(erp, sense);
2657
2658                 } else if (sense && erp->function == dasd_3990_erp_int_req) {
2659
2660                         erp = dasd_3990_erp_int_req(erp);
2661
2662                 } else {
2663                         /* simple retry   */
2664                         DBF_DEV_EVENT(DBF_DEBUG, device,
2665                                     "%i retries left for erp %p",
2666                                     erp->retries, erp);
2667
2668                         /* handle the request again... */
2669                         erp->status = DASD_CQR_FILLED;
2670                 }
2671
2672         } else {
2673                 /* no retry left - check for further necessary action    */
2674                 /* if no further actions, handle rest as permanent error */
2675                 erp = dasd_3990_erp_further_erp(erp);
2676         }
2677
2678         return erp;
2679
2680 }                               /* end dasd_3990_erp_handle_match_erp */
2681
2682 /*
2683  * DASD_3990_ERP_ACTION
2684  *
2685  * DESCRIPTION
2686  *   control routine for 3990 erp actions.
2687  *   Has to be called with the queue lock (namely the s390_irq_lock) acquired.
2688  *
2689  * PARAMETER
2690  *   cqr                failed cqr (either original cqr or already an erp)
2691  *
2692  * RETURN VALUES
2693  *   erp                erp-pointer to the head of the ERP action chain.
2694  *                      This means:
2695  *                       - either a ptr to an additional ERP cqr or
2696  *                       - the original given cqr (which's status might
2697  *                         be modified)
2698  */
2699 struct dasd_ccw_req *
2700 dasd_3990_erp_action(struct dasd_ccw_req * cqr)
2701 {
2702         struct dasd_ccw_req *erp = NULL;
2703         struct dasd_device *device = cqr->startdev;
2704         struct dasd_ccw_req *temp_erp = NULL;
2705
2706         if (device->features & DASD_FEATURE_ERPLOG) {
2707                 /* print current erp_chain */
2708                 dev_err(&device->cdev->dev,
2709                             "ERP chain at BEGINNING of ERP-ACTION\n");
2710                 for (temp_erp = cqr;
2711                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2712
2713                         dev_err(&device->cdev->dev,
2714                                     "ERP %p (%02x) refers to %p\n",
2715                                     temp_erp, temp_erp->status,
2716                                     temp_erp->refers);
2717                 }
2718         }
2719
2720         /* double-check if current erp/cqr was successful */
2721         if ((scsw_cstat(&cqr->irb.scsw) == 0x00) &&
2722             (scsw_dstat(&cqr->irb.scsw) ==
2723              (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
2724
2725                 DBF_DEV_EVENT(DBF_DEBUG, device,
2726                             "ERP called for successful request %p"
2727                             " - NO ERP necessary", cqr);
2728
2729                 cqr->status = DASD_CQR_DONE;
2730
2731                 return cqr;
2732         }
2733
2734         /* check if error happened before */
2735         erp = dasd_3990_erp_in_erp(cqr);
2736
2737         if (erp == NULL) {
2738                 /* no matching erp found - set up erp */
2739                 erp = dasd_3990_erp_additional_erp(cqr);
2740                 if (IS_ERR(erp))
2741                         return erp;
2742         } else {
2743                 /* matching erp found - set all leading erp's to DONE */
2744                 erp = dasd_3990_erp_handle_match_erp(cqr, erp);
2745         }
2746
2747         if (device->features & DASD_FEATURE_ERPLOG) {
2748                 /* print current erp_chain */
2749                 dev_err(&device->cdev->dev,
2750                             "ERP chain at END of ERP-ACTION\n");
2751                 for (temp_erp = erp;
2752                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2753
2754                         dev_err(&device->cdev->dev,
2755                                     "ERP %p (%02x) refers to %p\n",
2756                                     temp_erp, temp_erp->status,
2757                                     temp_erp->refers);
2758                 }
2759         }
2760
2761         /* enqueue ERP request if it's a new one */
2762         if (list_empty(&erp->blocklist)) {
2763                 cqr->status = DASD_CQR_IN_ERP;
2764                 /* add erp request before the cqr */
2765                 list_add_tail(&erp->blocklist, &cqr->blocklist);
2766         }
2767
2768
2769
2770         return erp;
2771
2772 }                               /* end dasd_3990_erp_action */