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