kernel/drivers/s390/block/dasd_3990_erp.c

   1 /*
   2  * Author(s)......: Horst  Hummel    <Horst.Hummel@de.ibm.com>
   3  *                  Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * Copyright IBM Corp. 2000, 2001
   6  *
   7  */
   8
   9 #define KMSG_COMPONENT "dasd-eckd"
  10
  11 #include <linux/timer.h>
  12 #include <asm/idals.h>
  13
  14 #define PRINTK_HEADER "dasd_erp(3990): "
  15
  16 #include "dasd_int.h"
  17 #include "dasd_eckd.h"
  18
  19
  20 struct DCTL_data {
  21         unsigned char subcommand;  /* e.g Inhibit Write, Enable Write,... */
  22         unsigned char modifier;    /* Subcommand modifier */
  23         unsigned short res;        /* reserved */
  24 } __attribute__ ((packed));
  25
  26 /*
  27  *****************************************************************************
  28  * SECTION ERP HANDLING
  29  *****************************************************************************
  30  */
  31 /*
  32  *****************************************************************************
  33  * 24 and 32 byte sense ERP functions
  34  *****************************************************************************
  35  */
  36
  37 /*
  38  * DASD_3990_ERP_CLEANUP
  39  *
  40  * DESCRIPTION
  41  *   Removes the already build but not necessary ERP request and sets
  42  *   the status of the original cqr / erp to the given (final) status
  43  *
  44  *  PARAMETER
  45  *   erp                request to be blocked
  46  *   final_status       either DASD_CQR_DONE or DASD_CQR_FAILED
  47  *
  48  * RETURN VALUES
  49  *   cqr                original cqr
  50  */
  51 static struct dasd_ccw_req *
  52 dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status)
  53 {
  54         struct dasd_ccw_req *cqr = erp->refers;
  55
  56         dasd_free_erp_request(erp, erp->memdev);
  57         cqr->status = final_status;
  58         return cqr;
  59
  60 }                               /* end dasd_3990_erp_cleanup */
  61
  62 /*
  63  * DASD_3990_ERP_BLOCK_QUEUE
  64  *
  65  * DESCRIPTION
  66  *   Block the given device request queue to prevent from further
  67  *   processing until the started timer has expired or an related
  68  *   interrupt was received.
  69  */
  70 static void dasd_3990_erp_block_queue(struct dasd_ccw_req *erp, int expires)
  71 {
  72
  73         struct dasd_device *device = erp->startdev;
  74         unsigned long flags;
  75
  76         DBF_DEV_EVENT(DBF_INFO, device,
  77                     "blocking request queue for %is", expires/HZ);
  78
  79         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
  80         dasd_device_set_stop_bits(device, DASD_STOPPED_PENDING);
  81         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
  82         erp->status = DASD_CQR_FILLED;
  83         if (erp->block)
  84                 dasd_block_set_timer(erp->block, expires);
  85         else
  86                 dasd_device_set_timer(device, expires);
  87 }
  88
  89 /*
  90  * DASD_3990_ERP_INT_REQ
  91  *
  92  * DESCRIPTION
  93  *   Handles 'Intervention Required' error.
  94  *   This means either device offline or not installed.
  95  *
  96  * PARAMETER
  97  *   erp                current erp
  98  * RETURN VALUES
  99  *   erp                modified erp
 100  */
 101 static struct dasd_ccw_req *
 102 dasd_3990_erp_int_req(struct dasd_ccw_req * erp)
 103 {
 104
 105         struct dasd_device *device = erp->startdev;
 106
 107         /* first time set initial retry counter and erp_function */
 108         /* and retry once without blocking queue                 */
 109         /* (this enables easier enqueing of the cqr)             */
 110         if (erp->function != dasd_3990_erp_int_req) {
 111
 112                 erp->retries = 256;
 113                 erp->function = dasd_3990_erp_int_req;
 114
 115         } else {
 116
 117                 /* issue a message and wait for 'device ready' interrupt */
 118                 dev_err(&device->cdev->dev,
 119                             "is offline or not installed - "
 120                             "INTERVENTION REQUIRED!!\n");
 121
 122                 dasd_3990_erp_block_queue(erp, 60*HZ);
 123         }
 124
 125         return erp;
 126
 127 }                               /* end dasd_3990_erp_int_req */
 128
 129 /*
 130  * DASD_3990_ERP_ALTERNATE_PATH
 131  *
 132  * DESCRIPTION
 133  *   Repeat the operation on a different channel path.
 134  *   If all alternate paths have been tried, the request is posted with a
 135  *   permanent error.
 136  *
 137  *  PARAMETER
 138  *   erp                pointer to the current ERP
 139  *
 140  * RETURN VALUES
 141  *   erp                modified pointer to the ERP
 142  */
 143 static void
 144 dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
 145 {
 146         struct dasd_device *device = erp->startdev;
 147         __u8 opm;
 148         unsigned long flags;
 149
 150         /* try alternate valid path */
 151         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 152         opm = ccw_device_get_path_mask(device->cdev);
 153         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 154         if (erp->lpm == 0)
 155                 erp->lpm = device->path_data.opm &
 156                         ~(erp->irb.esw.esw0.sublog.lpum);
 157         else
 158                 erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
 159
 160         if ((erp->lpm & opm) != 0x00) {
 161
 162                 DBF_DEV_EVENT(DBF_WARNING, device,
 163                             "try alternate lpm=%x (lpum=%x / opm=%x)",
 164                             erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm);
 165
 166                 /* reset status to submit the request again... */
 167                 erp->status = DASD_CQR_FILLED;
 168                 erp->retries = 10;
 169         } else {
 170                 dev_err(&device->cdev->dev,
 171                         "The DASD cannot be reached on any path (lpum=%x"
 172                         "/opm=%x)\n", erp->irb.esw.esw0.sublog.lpum, opm);
 173
 174                 /* post request with permanent error */
 175                 erp->status = DASD_CQR_FAILED;
 176         }
 177 }                               /* end dasd_3990_erp_alternate_path */
 178
 179 /*
 180  * DASD_3990_ERP_DCTL
 181  *
 182  * DESCRIPTION
 183  *   Setup cqr to do the Diagnostic Control (DCTL) command with an
 184  *   Inhibit Write subcommand (0x20) and the given modifier.
 185  *
 186  *  PARAMETER
 187  *   erp                pointer to the current (failed) ERP
 188  *   modifier           subcommand modifier
 189  *
 190  * RETURN VALUES
 191  *   dctl_cqr           pointer to NEW dctl_cqr
 192  *
 193  */
 194 static struct dasd_ccw_req *
 195 dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier)
 196 {
 197
 198         struct dasd_device *device = erp->startdev;
 199         struct DCTL_data *DCTL_data;
 200         struct ccw1 *ccw;
 201         struct dasd_ccw_req *dctl_cqr;
 202
 203         dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1,
 204                                           sizeof(struct DCTL_data),
 205                                           device);
 206         if (IS_ERR(dctl_cqr)) {
 207                 dev_err(&device->cdev->dev,
 208                             "Unable to allocate DCTL-CQR\n");
 209                 erp->status = DASD_CQR_FAILED;
 210                 return erp;
 211         }
 212
 213         DCTL_data = dctl_cqr->data;
 214
 215         DCTL_data->subcommand = 0x02;   /* Inhibit Write */
 216         DCTL_data->modifier = modifier;
 217
 218         ccw = dctl_cqr->cpaddr;
 219         memset(ccw, 0, sizeof(struct ccw1));
 220         ccw->cmd_code = CCW_CMD_DCTL;
 221         ccw->count = 4;
 222         ccw->cda = (__u32)(addr_t) DCTL_data;
 223         dctl_cqr->flags = erp->flags;
 224         dctl_cqr->function = dasd_3990_erp_DCTL;
 225         dctl_cqr->refers = erp;
 226         dctl_cqr->startdev = device;
 227         dctl_cqr->memdev = device;
 228         dctl_cqr->magic = erp->magic;
 229         dctl_cqr->expires = 5 * 60 * HZ;
 230         dctl_cqr->retries = 2;
 231
 232         dctl_cqr->buildclk = get_tod_clock();
 233
 234         dctl_cqr->status = DASD_CQR_FILLED;
 235
 236         return dctl_cqr;
 237
 238 }                               /* end dasd_3990_erp_DCTL */
 239
 240 /*
 241  * DASD_3990_ERP_ACTION_1
 242  *
 243  * DESCRIPTION
 244  *   Setup ERP to do the ERP action 1 (see Reference manual).
 245  *   Repeat the operation on a different channel path.
 246  *   As deviation from the recommended recovery action, we reset the path mask
 247  *   after we have tried each path and go through all paths a second time.
 248  *   This will cover situations where only one path at a time is actually down,
 249  *   but all paths fail and recover just with the same sequence and timing as
 250  *   we try to use them (flapping links).
 251  *   If all alternate paths have been tried twice, the request is posted with
 252  *   a permanent error.
 253  *
 254  *  PARAMETER
 255  *   erp                pointer to the current ERP
 256  *
 257  * RETURN VALUES
 258  *   erp                pointer to the ERP
 259  *
 260  */
 261 static struct dasd_ccw_req *dasd_3990_erp_action_1_sec(struct dasd_ccw_req *erp)
 262 {
 263         erp->function = dasd_3990_erp_action_1_sec;
 264         dasd_3990_erp_alternate_path(erp);
 265         return erp;
 266 }
 267
 268 static struct dasd_ccw_req *dasd_3990_erp_action_1(struct dasd_ccw_req *erp)
 269 {
 270         erp->function = dasd_3990_erp_action_1;
 271         dasd_3990_erp_alternate_path(erp);
 272         if (erp->status == DASD_CQR_FAILED &&
 273             !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
 274                 erp->status = DASD_CQR_FILLED;
 275                 erp->retries = 10;
 276                 erp->lpm = erp->startdev->path_data.opm;
 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 if (sense[1] & SNS1_WRITE_INHIBITED) {
1049                 dev_err(&device->cdev->dev, "An I/O request was rejected"
1050                         " because writing is inhibited\n");
1051                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1052         } else {
1053                 /* fatal error -  set status to FAILED
1054                    internal error 09 - Command Reject */
1055                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1056                         "device driver, reason=%s\n", "09");
1057
1058                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1059         }
1060
1061         return erp;
1062
1063 }                               /* end dasd_3990_erp_com_rej */
1064
1065 /*
1066  * DASD_3990_ERP_BUS_OUT
1067  *
1068  * DESCRIPTION
1069  *   Handles 24 byte 'Bus Out Parity Check' error.
1070  *
1071  * PARAMETER
1072  *   erp                current erp_head
1073  * RETURN VALUES
1074  *   erp                new erp_head - pointer to new ERP
1075  */
1076 static struct dasd_ccw_req *
1077 dasd_3990_erp_bus_out(struct dasd_ccw_req * erp)
1078 {
1079
1080         struct dasd_device *device = erp->startdev;
1081
1082         /* first time set initial retry counter and erp_function */
1083         /* and retry once without blocking queue                 */
1084         /* (this enables easier enqueing of the cqr)             */
1085         if (erp->function != dasd_3990_erp_bus_out) {
1086                 erp->retries = 256;
1087                 erp->function = dasd_3990_erp_bus_out;
1088
1089         } else {
1090
1091                 /* issue a message and wait for 'device ready' interrupt */
1092                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1093                             "bus out parity error or BOPC requested by "
1094                             "channel");
1095
1096                 dasd_3990_erp_block_queue(erp, 60*HZ);
1097
1098         }
1099
1100         return erp;
1101
1102 }                               /* end dasd_3990_erp_bus_out */
1103
1104 /*
1105  * DASD_3990_ERP_EQUIP_CHECK
1106  *
1107  * DESCRIPTION
1108  *   Handles 24 byte 'Equipment Check' error.
1109  *
1110  * PARAMETER
1111  *   erp                current erp_head
1112  * RETURN VALUES
1113  *   erp                new erp_head - pointer to new ERP
1114  */
1115 static struct dasd_ccw_req *
1116 dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense)
1117 {
1118
1119         struct dasd_device *device = erp->startdev;
1120
1121         erp->function = dasd_3990_erp_equip_check;
1122
1123         if (sense[1] & SNS1_WRITE_INHIBITED) {
1124                 dev_info(&device->cdev->dev,
1125                             "Write inhibited path encountered\n");
1126
1127                 /* vary path offline
1128                    internal error 04 - Path should be varied off-line.*/
1129                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1130                         "device driver, reason=%s\n", "04");
1131
1132                 erp = dasd_3990_erp_action_1(erp);
1133
1134         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1135
1136                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1137                             "Equipment Check - " "environmental data present");
1138
1139                 dasd_3990_handle_env_data(erp, sense);
1140
1141                 erp = dasd_3990_erp_action_4(erp, sense);
1142
1143         } else if (sense[1] & SNS1_PERM_ERR) {
1144
1145                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1146                             "Equipment Check - retry exhausted or "
1147                             "undesirable");
1148
1149                 erp = dasd_3990_erp_action_1(erp);
1150
1151         } else {
1152                 /* all other equipment checks - Action 5 */
1153                 /* rest is done when retries == 0 */
1154                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1155                             "Equipment check or processing error");
1156
1157                 erp = dasd_3990_erp_action_5(erp);
1158         }
1159         return erp;
1160
1161 }                               /* end dasd_3990_erp_equip_check */
1162
1163 /*
1164  * DASD_3990_ERP_DATA_CHECK
1165  *
1166  * DESCRIPTION
1167  *   Handles 24 byte 'Data Check' error.
1168  *
1169  * PARAMETER
1170  *   erp                current erp_head
1171  * RETURN VALUES
1172  *   erp                new erp_head - pointer to new ERP
1173  */
1174 static struct dasd_ccw_req *
1175 dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense)
1176 {
1177
1178         struct dasd_device *device = erp->startdev;
1179
1180         erp->function = dasd_3990_erp_data_check;
1181
1182         if (sense[2] & SNS2_CORRECTABLE) {      /* correctable data check */
1183
1184                 /* issue message that the data has been corrected */
1185                 dev_emerg(&device->cdev->dev,
1186                             "Data recovered during retry with PCI "
1187                             "fetch mode active\n");
1188
1189                 /* not possible to handle this situation in Linux */
1190                 panic("No way to inform application about the possibly "
1191                       "incorrect data");
1192
1193         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1194
1195                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1196                             "Uncorrectable data check recovered secondary "
1197                             "addr of duplex pair");
1198
1199                 erp = dasd_3990_erp_action_4(erp, sense);
1200
1201         } else if (sense[1] & SNS1_PERM_ERR) {
1202
1203                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1204                             "Uncorrectable data check with internal "
1205                             "retry exhausted");
1206
1207                 erp = dasd_3990_erp_action_1(erp);
1208
1209         } else {
1210                 /* all other data checks */
1211                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1212                             "Uncorrectable data check with retry count "
1213                             "exhausted...");
1214
1215                 erp = dasd_3990_erp_action_5(erp);
1216         }
1217
1218         return erp;
1219
1220 }                               /* end dasd_3990_erp_data_check */
1221
1222 /*
1223  * DASD_3990_ERP_OVERRUN
1224  *
1225  * DESCRIPTION
1226  *   Handles 24 byte 'Overrun' error.
1227  *
1228  * PARAMETER
1229  *   erp                current erp_head
1230  * RETURN VALUES
1231  *   erp                new erp_head - pointer to new ERP
1232  */
1233 static struct dasd_ccw_req *
1234 dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense)
1235 {
1236
1237         struct dasd_device *device = erp->startdev;
1238
1239         erp->function = dasd_3990_erp_overrun;
1240
1241         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1242                     "Overrun - service overrun or overrun"
1243                     " error requested by channel");
1244
1245         erp = dasd_3990_erp_action_5(erp);
1246
1247         return erp;
1248
1249 }                               /* end dasd_3990_erp_overrun */
1250
1251 /*
1252  * DASD_3990_ERP_INV_FORMAT
1253  *
1254  * DESCRIPTION
1255  *   Handles 24 byte 'Invalid Track Format' error.
1256  *
1257  * PARAMETER
1258  *   erp                current erp_head
1259  * RETURN VALUES
1260  *   erp                new erp_head - pointer to new ERP
1261  */
1262 static struct dasd_ccw_req *
1263 dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense)
1264 {
1265
1266         struct dasd_device *device = erp->startdev;
1267
1268         erp->function = dasd_3990_erp_inv_format;
1269
1270         if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1271
1272                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1273                             "Track format error when destaging or "
1274                             "staging data");
1275
1276                 dasd_3990_handle_env_data(erp, sense);
1277
1278                 erp = dasd_3990_erp_action_4(erp, sense);
1279
1280         } else {
1281                 /* internal error 06 - The track format is not valid*/
1282                 dev_err(&device->cdev->dev,
1283                         "An error occurred in the DASD device driver, "
1284                         "reason=%s\n", "06");
1285
1286                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1287         }
1288
1289         return erp;
1290
1291 }                               /* end dasd_3990_erp_inv_format */
1292
1293 /*
1294  * DASD_3990_ERP_EOC
1295  *
1296  * DESCRIPTION
1297  *   Handles 24 byte 'End-of-Cylinder' error.
1298  *
1299  * PARAMETER
1300  *   erp                already added default erp
1301  * RETURN VALUES
1302  *   erp                pointer to original (failed) cqr.
1303  */
1304 static struct dasd_ccw_req *
1305 dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense)
1306 {
1307
1308         struct dasd_device *device = default_erp->startdev;
1309
1310         dev_err(&device->cdev->dev,
1311                 "The cylinder data for accessing the DASD is inconsistent\n");
1312
1313         /* implement action 7 - BUG */
1314         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1315
1316 }                               /* end dasd_3990_erp_EOC */
1317
1318 /*
1319  * DASD_3990_ERP_ENV_DATA
1320  *
1321  * DESCRIPTION
1322  *   Handles 24 byte 'Environmental-Data Present' error.
1323  *
1324  * PARAMETER
1325  *   erp                current erp_head
1326  * RETURN VALUES
1327  *   erp                new erp_head - pointer to new ERP
1328  */
1329 static struct dasd_ccw_req *
1330 dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense)
1331 {
1332
1333         struct dasd_device *device = erp->startdev;
1334
1335         erp->function = dasd_3990_erp_env_data;
1336
1337         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Environmental data present");
1338
1339         dasd_3990_handle_env_data(erp, sense);
1340
1341         /* don't retry on disabled interface */
1342         if (sense[7] != 0x0F) {
1343                 erp = dasd_3990_erp_action_4(erp, sense);
1344         } else {
1345                 erp->status = DASD_CQR_FILLED;
1346         }
1347
1348         return erp;
1349
1350 }                               /* end dasd_3990_erp_env_data */
1351
1352 /*
1353  * DASD_3990_ERP_NO_REC
1354  *
1355  * DESCRIPTION
1356  *   Handles 24 byte 'No Record Found' error.
1357  *
1358  * PARAMETER
1359  *   erp                already added default ERP
1360  *
1361  * RETURN VALUES
1362  *   erp                new erp_head - pointer to new ERP
1363  */
1364 static struct dasd_ccw_req *
1365 dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense)
1366 {
1367
1368         struct dasd_device *device = default_erp->startdev;
1369
1370         dev_err(&device->cdev->dev,
1371                     "The specified record was not found\n");
1372
1373         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1374
1375 }                               /* end dasd_3990_erp_no_rec */
1376
1377 /*
1378  * DASD_3990_ERP_FILE_PROT
1379  *
1380  * DESCRIPTION
1381  *   Handles 24 byte 'File Protected' error.
1382  *   Note: Seek related recovery is not implemented because
1383  *         wee don't use the seek command yet.
1384  *
1385  * PARAMETER
1386  *   erp                current erp_head
1387  * RETURN VALUES
1388  *   erp                new erp_head - pointer to new ERP
1389  */
1390 static struct dasd_ccw_req *
1391 dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
1392 {
1393
1394         struct dasd_device *device = erp->startdev;
1395
1396         dev_err(&device->cdev->dev, "Accessing the DASD failed because of "
1397                 "a hardware error\n");
1398
1399         return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1400
1401 }                               /* end dasd_3990_erp_file_prot */
1402
1403 /*
1404  * DASD_3990_ERP_INSPECT_ALIAS
1405  *
1406  * DESCRIPTION
1407  *   Checks if the original request was started on an alias device.
1408  *   If yes, it modifies the original and the erp request so that
1409  *   the erp request can be started on a base device.
1410  *
1411  * PARAMETER
1412  *   erp                pointer to the currently created default ERP
1413  *
1414  * RETURN VALUES
1415  *   erp                pointer to the modified ERP, or NULL
1416  */
1417
1418 static struct dasd_ccw_req *dasd_3990_erp_inspect_alias(
1419                                                 struct dasd_ccw_req *erp)
1420 {
1421         struct dasd_ccw_req *cqr = erp->refers;
1422         char *sense;
1423
1424         if (cqr->block &&
1425             (cqr->block->base != cqr->startdev)) {
1426
1427                 sense = dasd_get_sense(&erp->refers->irb);
1428                 /*
1429                  * dynamic pav may have changed base alias mapping
1430                  */
1431                 if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense
1432                     && (sense[0] == 0x10) && (sense[7] == 0x0F)
1433                     && (sense[8] == 0x67)) {
1434                         /*
1435                          * remove device from alias handling to prevent new
1436                          * requests from being scheduled on the
1437                          * wrong alias device
1438                          */
1439                         dasd_alias_remove_device(cqr->startdev);
1440
1441                         /* schedule worker to reload device */
1442                         dasd_reload_device(cqr->startdev);
1443                 }
1444
1445                 if (cqr->startdev->features & DASD_FEATURE_ERPLOG) {
1446                         DBF_DEV_EVENT(DBF_ERR, cqr->startdev,
1447                                     "ERP on alias device for request %p,"
1448                                     " recover on base device %s", cqr,
1449                                     dev_name(&cqr->block->base->cdev->dev));
1450                 }
1451                 dasd_eckd_reset_ccw_to_base_io(cqr);
1452                 erp->startdev = cqr->block->base;
1453                 erp->function = dasd_3990_erp_inspect_alias;
1454                 return erp;
1455         } else
1456                 return NULL;
1457 }
1458
1459
1460 /*
1461  * DASD_3990_ERP_INSPECT_24
1462  *
1463  * DESCRIPTION
1464  *   Does a detailed inspection of the 24 byte sense data
1465  *   and sets up a related error recovery action.
1466  *
1467  * PARAMETER
1468  *   sense              sense data of the actual error
1469  *   erp                pointer to the currently created default ERP
1470  *
1471  * RETURN VALUES
1472  *   erp                pointer to the (addtitional) ERP
1473  */
1474 static struct dasd_ccw_req *
1475 dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense)
1476 {
1477
1478         struct dasd_ccw_req *erp_filled = NULL;
1479
1480         /* Check sense for ....    */
1481         /* 'Command Reject'        */
1482         if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) {
1483                 erp_filled = dasd_3990_erp_com_rej(erp, sense);
1484         }
1485         /* 'Intervention Required' */
1486         if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) {
1487                 erp_filled = dasd_3990_erp_int_req(erp);
1488         }
1489         /* 'Bus Out Parity Check'  */
1490         if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) {
1491                 erp_filled = dasd_3990_erp_bus_out(erp);
1492         }
1493         /* 'Equipment Check'       */
1494         if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) {
1495                 erp_filled = dasd_3990_erp_equip_check(erp, sense);
1496         }
1497         /* 'Data Check'            */
1498         if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) {
1499                 erp_filled = dasd_3990_erp_data_check(erp, sense);
1500         }
1501         /* 'Overrun'               */
1502         if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) {
1503                 erp_filled = dasd_3990_erp_overrun(erp, sense);
1504         }
1505         /* 'Invalid Track Format'  */
1506         if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) {
1507                 erp_filled = dasd_3990_erp_inv_format(erp, sense);
1508         }
1509         /* 'End-of-Cylinder'       */
1510         if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) {
1511                 erp_filled = dasd_3990_erp_EOC(erp, sense);
1512         }
1513         /* 'Environmental Data'    */
1514         if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) {
1515                 erp_filled = dasd_3990_erp_env_data(erp, sense);
1516         }
1517         /* 'No Record Found'       */
1518         if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) {
1519                 erp_filled = dasd_3990_erp_no_rec(erp, sense);
1520         }
1521         /* 'File Protected'        */
1522         if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) {
1523                 erp_filled = dasd_3990_erp_file_prot(erp);
1524         }
1525         /* other (unknown) error - do default ERP */
1526         if (erp_filled == NULL) {
1527
1528                 erp_filled = erp;
1529         }
1530
1531         return erp_filled;
1532
1533 }                               /* END dasd_3990_erp_inspect_24 */
1534
1535 /*
1536  *****************************************************************************
1537  * 32 byte sense ERP functions (only)
1538  *****************************************************************************
1539  */
1540
1541 /*
1542  * DASD_3990_ERPACTION_10_32
1543  *
1544  * DESCRIPTION
1545  *   Handles 32 byte 'Action 10' of Single Program Action Codes.
1546  *   Just retry and if retry doesn't work, return with error.
1547  *
1548  * PARAMETER
1549  *   erp                current erp_head
1550  *   sense              current sense data
1551  * RETURN VALUES
1552  *   erp                modified erp_head
1553  */
1554 static struct dasd_ccw_req *
1555 dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense)
1556 {
1557
1558         struct dasd_device *device = erp->startdev;
1559
1560         erp->retries = 256;
1561         erp->function = dasd_3990_erp_action_10_32;
1562
1563         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Perform logging requested");
1564
1565         return erp;
1566
1567 }                               /* end dasd_3990_erp_action_10_32 */
1568
1569 /*
1570  * DASD_3990_ERP_ACTION_1B_32
1571  *
1572  * DESCRIPTION
1573  *   Handles 32 byte 'Action 1B' of Single Program Action Codes.
1574  *   A write operation could not be finished because of an unexpected
1575  *   condition.
1576  *   The already created 'default erp' is used to get the link to
1577  *   the erp chain, but it can not be used for this recovery
1578  *   action because it contains no DE/LO data space.
1579  *
1580  * PARAMETER
1581  *   default_erp        already added default erp.
1582  *   sense              current sense data
1583  *
1584  * RETURN VALUES
1585  *   erp                new erp or
1586  *                      default_erp in case of imprecise ending or error
1587  */
1588 static struct dasd_ccw_req *
1589 dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
1590 {
1591
1592         struct dasd_device *device = default_erp->startdev;
1593         __u32 cpa = 0;
1594         struct dasd_ccw_req *cqr;
1595         struct dasd_ccw_req *erp;
1596         struct DE_eckd_data *DE_data;
1597         struct PFX_eckd_data *PFX_data;
1598         char *LO_data;          /* LO_eckd_data_t */
1599         struct ccw1 *ccw, *oldccw;
1600
1601         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1602                     "Write not finished because of unexpected condition");
1603
1604         default_erp->function = dasd_3990_erp_action_1B_32;
1605
1606         /* determine the original cqr */
1607         cqr = default_erp;
1608
1609         while (cqr->refers != NULL) {
1610                 cqr = cqr->refers;
1611         }
1612
1613         if (scsw_is_tm(&cqr->irb.scsw)) {
1614                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1615                               "32 bit sense, action 1B is not defined"
1616                               " in transport mode - just retry");
1617                 return default_erp;
1618         }
1619
1620         /* for imprecise ending just do default erp */
1621         if (sense[1] & 0x01) {
1622                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1623                             "Imprecise ending is set - just retry");
1624
1625                 return default_erp;
1626         }
1627
1628         /* determine the address of the CCW to be restarted */
1629         /* Imprecise ending is not set -> addr from IRB-SCSW */
1630         cpa = default_erp->refers->irb.scsw.cmd.cpa;
1631
1632         if (cpa == 0) {
1633                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1634                             "Unable to determine address of the CCW "
1635                             "to be restarted");
1636
1637                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1638         }
1639
1640         /* Build new ERP request including DE/LO */
1641         erp = dasd_alloc_erp_request((char *) &cqr->magic,
1642                                      2 + 1,/* DE/LO + TIC */
1643                                      sizeof(struct DE_eckd_data) +
1644                                      sizeof(struct LO_eckd_data), device);
1645
1646         if (IS_ERR(erp)) {
1647                 /* internal error 01 - Unable to allocate ERP */
1648                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1649                         "device driver, reason=%s\n", "01");
1650                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1651         }
1652
1653         /* use original DE */
1654         DE_data = erp->data;
1655         oldccw = cqr->cpaddr;
1656         if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) {
1657                 PFX_data = cqr->data;
1658                 memcpy(DE_data, &PFX_data->define_extent,
1659                        sizeof(struct DE_eckd_data));
1660         } else
1661                 memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data));
1662
1663         /* create LO */
1664         LO_data = erp->data + sizeof(struct DE_eckd_data);
1665
1666         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1667                 /* should not */
1668                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1669         }
1670
1671         if ((sense[7] & 0x3F) == 0x01) {
1672                 /* operation code is WRITE DATA -> data area orientation */
1673                 LO_data[0] = 0x81;
1674
1675         } else if ((sense[7] & 0x3F) == 0x03) {
1676                 /* operation code is FORMAT WRITE -> index orientation */
1677                 LO_data[0] = 0xC3;
1678
1679         } else {
1680                 LO_data[0] = sense[7];  /* operation */
1681         }
1682
1683         LO_data[1] = sense[8];  /* auxiliary */
1684         LO_data[2] = sense[9];
1685         LO_data[3] = sense[3];  /* count */
1686         LO_data[4] = sense[29]; /* seek_addr.cyl */
1687         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1688         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1689
1690         memcpy(&(LO_data[8]), &(sense[11]), 8);
1691
1692         /* create DE ccw */
1693         ccw = erp->cpaddr;
1694         memset(ccw, 0, sizeof(struct ccw1));
1695         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
1696         ccw->flags = CCW_FLAG_CC;
1697         ccw->count = 16;
1698         ccw->cda = (__u32)(addr_t) DE_data;
1699
1700         /* create LO ccw */
1701         ccw++;
1702         memset(ccw, 0, sizeof(struct ccw1));
1703         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
1704         ccw->flags = CCW_FLAG_CC;
1705         ccw->count = 16;
1706         ccw->cda = (__u32)(addr_t) LO_data;
1707
1708         /* TIC to the failed ccw */
1709         ccw++;
1710         ccw->cmd_code = CCW_CMD_TIC;
1711         ccw->cda = cpa;
1712
1713         /* fill erp related fields */
1714         erp->flags = default_erp->flags;
1715         erp->function = dasd_3990_erp_action_1B_32;
1716         erp->refers = default_erp->refers;
1717         erp->startdev = device;
1718         erp->memdev = device;
1719         erp->magic = default_erp->magic;
1720         erp->expires = default_erp->expires;
1721         erp->retries = 256;
1722         erp->buildclk = get_tod_clock();
1723         erp->status = DASD_CQR_FILLED;
1724
1725         /* remove the default erp */
1726         dasd_free_erp_request(default_erp, device);
1727
1728         return erp;
1729
1730 }                               /* end dasd_3990_erp_action_1B_32 */
1731
1732 /*
1733  * DASD_3990_UPDATE_1B
1734  *
1735  * DESCRIPTION
1736  *   Handles the update to the 32 byte 'Action 1B' of Single Program
1737  *   Action Codes in case the first action was not successful.
1738  *   The already created 'previous_erp' is the currently not successful
1739  *   ERP.
1740  *
1741  * PARAMETER
1742  *   previous_erp       already created previous erp.
1743  *   sense              current sense data
1744  * RETURN VALUES
1745  *   erp                modified erp
1746  */
1747 static struct dasd_ccw_req *
1748 dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense)
1749 {
1750
1751         struct dasd_device *device = previous_erp->startdev;
1752         __u32 cpa = 0;
1753         struct dasd_ccw_req *cqr;
1754         struct dasd_ccw_req *erp;
1755         char *LO_data;          /* struct LO_eckd_data */
1756         struct ccw1 *ccw;
1757
1758         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1759                     "Write not finished because of unexpected condition"
1760                     " - follow on");
1761
1762         /* determine the original cqr */
1763         cqr = previous_erp;
1764
1765         while (cqr->refers != NULL) {
1766                 cqr = cqr->refers;
1767         }
1768
1769         if (scsw_is_tm(&cqr->irb.scsw)) {
1770                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1771                               "32 bit sense, action 1B, update,"
1772                               " in transport mode - just retry");
1773                 return previous_erp;
1774         }
1775
1776         /* for imprecise ending just do default erp */
1777         if (sense[1] & 0x01) {
1778                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1779                             "Imprecise ending is set - just retry");
1780
1781                 previous_erp->status = DASD_CQR_FILLED;
1782
1783                 return previous_erp;
1784         }
1785
1786         /* determine the address of the CCW to be restarted */
1787         /* Imprecise ending is not set -> addr from IRB-SCSW */
1788         cpa = previous_erp->irb.scsw.cmd.cpa;
1789
1790         if (cpa == 0) {
1791                 /* internal error 02 -
1792                    Unable to determine address of the CCW to be restarted */
1793                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1794                         "device driver, reason=%s\n", "02");
1795
1796                 previous_erp->status = DASD_CQR_FAILED;
1797
1798                 return previous_erp;
1799         }
1800
1801         erp = previous_erp;
1802
1803         /* update the LO with the new returned sense data  */
1804         LO_data = erp->data + sizeof(struct DE_eckd_data);
1805
1806         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1807                 /* should not happen */
1808                 previous_erp->status = DASD_CQR_FAILED;
1809
1810                 return previous_erp;
1811         }
1812
1813         if ((sense[7] & 0x3F) == 0x01) {
1814                 /* operation code is WRITE DATA -> data area orientation */
1815                 LO_data[0] = 0x81;
1816
1817         } else if ((sense[7] & 0x3F) == 0x03) {
1818                 /* operation code is FORMAT WRITE -> index orientation */
1819                 LO_data[0] = 0xC3;
1820
1821         } else {
1822                 LO_data[0] = sense[7];  /* operation */
1823         }
1824
1825         LO_data[1] = sense[8];  /* auxiliary */
1826         LO_data[2] = sense[9];
1827         LO_data[3] = sense[3];  /* count */
1828         LO_data[4] = sense[29]; /* seek_addr.cyl */
1829         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1830         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1831
1832         memcpy(&(LO_data[8]), &(sense[11]), 8);
1833
1834         /* TIC to the failed ccw */
1835         ccw = erp->cpaddr;      /* addr of DE ccw */
1836         ccw++;                  /* addr of LE ccw */
1837         ccw++;                  /* addr of TIC ccw */
1838         ccw->cda = cpa;
1839
1840         erp->status = DASD_CQR_FILLED;
1841
1842         return erp;
1843
1844 }                               /* end dasd_3990_update_1B */
1845
1846 /*
1847  * DASD_3990_ERP_COMPOUND_RETRY
1848  *
1849  * DESCRIPTION
1850  *   Handles the compound ERP action retry code.
1851  *   NOTE: At least one retry is done even if zero is specified
1852  *         by the sense data. This makes enqueueing of the request
1853  *         easier.
1854  *
1855  * PARAMETER
1856  *   sense              sense data of the actual error
1857  *   erp                pointer to the currently created ERP
1858  *
1859  * RETURN VALUES
1860  *   erp                modified ERP pointer
1861  *
1862  */
1863 static void
1864 dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
1865 {
1866
1867         switch (sense[25] & 0x03) {
1868         case 0x00:              /* no not retry */
1869                 erp->retries = 1;
1870                 break;
1871
1872         case 0x01:              /* retry 2 times */
1873                 erp->retries = 2;
1874                 break;
1875
1876         case 0x02:              /* retry 10 times */
1877                 erp->retries = 10;
1878                 break;
1879
1880         case 0x03:              /* retry 256 times */
1881                 erp->retries = 256;
1882                 break;
1883
1884         default:
1885                 BUG();
1886         }
1887
1888         erp->function = dasd_3990_erp_compound_retry;
1889
1890 }                               /* end dasd_3990_erp_compound_retry */
1891
1892 /*
1893  * DASD_3990_ERP_COMPOUND_PATH
1894  *
1895  * DESCRIPTION
1896  *   Handles the compound ERP action for retry on alternate
1897  *   channel path.
1898  *
1899  * PARAMETER
1900  *   sense              sense data of the actual error
1901  *   erp                pointer to the currently created ERP
1902  *
1903  * RETURN VALUES
1904  *   erp                modified ERP pointer
1905  *
1906  */
1907 static void
1908 dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
1909 {
1910         if (sense[25] & DASD_SENSE_BIT_3) {
1911                 dasd_3990_erp_alternate_path(erp);
1912
1913                 if (erp->status == DASD_CQR_FAILED &&
1914                     !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
1915                         /* reset the lpm and the status to be able to
1916                          * try further actions. */
1917                         erp->lpm = erp->startdev->path_data.opm;
1918                         erp->status = DASD_CQR_NEED_ERP;
1919                 }
1920         }
1921
1922         erp->function = dasd_3990_erp_compound_path;
1923
1924 }                               /* end dasd_3990_erp_compound_path */
1925
1926 /*
1927  * DASD_3990_ERP_COMPOUND_CODE
1928  *
1929  * DESCRIPTION
1930  *   Handles the compound ERP action for retry code.
1931  *
1932  * PARAMETER
1933  *   sense              sense data of the actual error
1934  *   erp                pointer to the currently created ERP
1935  *
1936  * RETURN VALUES
1937  *   erp                NEW ERP pointer
1938  *
1939  */
1940 static struct dasd_ccw_req *
1941 dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense)
1942 {
1943
1944         if (sense[25] & DASD_SENSE_BIT_2) {
1945
1946                 switch (sense[28]) {
1947                 case 0x17:
1948                         /* issue a Diagnostic Control command with an
1949                          * Inhibit Write subcommand and controller modifier */
1950                         erp = dasd_3990_erp_DCTL(erp, 0x20);
1951                         break;
1952
1953                 case 0x25:
1954                         /* wait for 5 seconds and retry again */
1955                         erp->retries = 1;
1956
1957                         dasd_3990_erp_block_queue (erp, 5*HZ);
1958                         break;
1959
1960                 default:
1961                         /* should not happen - continue */
1962                         break;
1963                 }
1964         }
1965
1966         erp->function = dasd_3990_erp_compound_code;
1967
1968         return erp;
1969
1970 }                               /* end dasd_3990_erp_compound_code */
1971
1972 /*
1973  * DASD_3990_ERP_COMPOUND_CONFIG
1974  *
1975  * DESCRIPTION
1976  *   Handles the compound ERP action for configruation
1977  *   dependent error.
1978  *   Note: duplex handling is not implemented (yet).
1979  *
1980  * PARAMETER
1981  *   sense              sense data of the actual error
1982  *   erp                pointer to the currently created ERP
1983  *
1984  * RETURN VALUES
1985  *   erp                modified ERP pointer
1986  *
1987  */
1988 static void
1989 dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense)
1990 {
1991
1992         if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) {
1993
1994                 /* set to suspended duplex state then restart
1995                    internal error 05 - Set device to suspended duplex state
1996                    should be done */
1997                 struct dasd_device *device = erp->startdev;
1998                 dev_err(&device->cdev->dev,
1999                         "An error occurred in the DASD device driver, "
2000                         "reason=%s\n", "05");
2001
2002         }
2003
2004         erp->function = dasd_3990_erp_compound_config;
2005
2006 }                               /* end dasd_3990_erp_compound_config */
2007
2008 /*
2009  * DASD_3990_ERP_COMPOUND
2010  *
2011  * DESCRIPTION
2012  *   Does the further compound program action if
2013  *   compound retry was not successful.
2014  *
2015  * PARAMETER
2016  *   sense              sense data of the actual error
2017  *   erp                pointer to the current (failed) ERP
2018  *
2019  * RETURN VALUES
2020  *   erp                (additional) ERP pointer
2021  *
2022  */
2023 static struct dasd_ccw_req *
2024 dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense)
2025 {
2026
2027         if ((erp->function == dasd_3990_erp_compound_retry) &&
2028             (erp->status == DASD_CQR_NEED_ERP)) {
2029
2030                 dasd_3990_erp_compound_path(erp, sense);
2031         }
2032
2033         if ((erp->function == dasd_3990_erp_compound_path) &&
2034             (erp->status == DASD_CQR_NEED_ERP)) {
2035
2036                 erp = dasd_3990_erp_compound_code(erp, sense);
2037         }
2038
2039         if ((erp->function == dasd_3990_erp_compound_code) &&
2040             (erp->status == DASD_CQR_NEED_ERP)) {
2041
2042                 dasd_3990_erp_compound_config(erp, sense);
2043         }
2044
2045         /* if no compound action ERP specified, the request failed */
2046         if (erp->status == DASD_CQR_NEED_ERP)
2047                 erp->status = DASD_CQR_FAILED;
2048
2049         return erp;
2050
2051 }                               /* end dasd_3990_erp_compound */
2052
2053 /*
2054  *DASD_3990_ERP_HANDLE_SIM
2055  *
2056  *DESCRIPTION
2057  *  inspects the SIM SENSE data and starts an appropriate action
2058  *
2059  * PARAMETER
2060  *   sense         sense data of the actual error
2061  *
2062  * RETURN VALUES
2063  *   none
2064  */
2065 void
2066 dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense)
2067 {
2068         /* print message according to log or message to operator mode */
2069         if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) {
2070                 /* print SIM SRC from RefCode */
2071                 dev_err(&device->cdev->dev, "SIM - SRC: "
2072                             "%02x%02x%02x%02x\n", sense[22],
2073                             sense[23], sense[11], sense[12]);
2074         } else if (sense[24] & DASD_SIM_LOG) {
2075                 /* print SIM SRC Refcode */
2076                 dev_warn(&device->cdev->dev, "log SIM - SRC: "
2077                             "%02x%02x%02x%02x\n", sense[22],
2078                             sense[23], sense[11], sense[12]);
2079         }
2080 }
2081
2082 /*
2083  * DASD_3990_ERP_INSPECT_32
2084  *
2085  * DESCRIPTION
2086  *   Does a detailed inspection of the 32 byte sense data
2087  *   and sets up a related error recovery action.
2088  *
2089  * PARAMETER
2090  *   sense              sense data of the actual error
2091  *   erp                pointer to the currently created default ERP
2092  *
2093  * RETURN VALUES
2094  *   erp_filled         pointer to the ERP
2095  *
2096  */
2097 static struct dasd_ccw_req *
2098 dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
2099 {
2100
2101         struct dasd_device *device = erp->startdev;
2102
2103         erp->function = dasd_3990_erp_inspect_32;
2104
2105         /* check for SIM sense data */
2106         if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)
2107                 dasd_3990_erp_handle_sim(device, sense);
2108
2109         if (sense[25] & DASD_SENSE_BIT_0) {
2110
2111                 /* compound program action codes (byte25 bit 0 == '1') */
2112                 dasd_3990_erp_compound_retry(erp, sense);
2113
2114         } else {
2115
2116                 /* single program action codes (byte25 bit 0 == '0') */
2117                 switch (sense[25]) {
2118
2119                 case 0x00:      /* success - use default ERP for retries */
2120                         DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
2121                                     "ERP called for successful request"
2122                                     " - just retry");
2123                         break;
2124
2125                 case 0x01:      /* fatal error */
2126                         dev_err(&device->cdev->dev,
2127                                     "ERP failed for the DASD\n");
2128
2129                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2130                         break;
2131
2132                 case 0x02:      /* intervention required */
2133                 case 0x03:      /* intervention required during dual copy */
2134                         erp = dasd_3990_erp_int_req(erp);
2135                         break;
2136
2137                 case 0x0F:  /* length mismatch during update write command
2138                                internal error 08 - update write command error*/
2139                         dev_err(&device->cdev->dev, "An error occurred in the "
2140                                 "DASD device driver, reason=%s\n", "08");
2141
2142                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2143                         break;
2144
2145                 case 0x10:  /* logging required for other channel program */
2146                         erp = dasd_3990_erp_action_10_32(erp, sense);
2147                         break;
2148
2149                 case 0x15:      /* next track outside defined extend
2150                                    internal error 07 - The next track is not
2151                                    within the defined storage extent */
2152                         dev_err(&device->cdev->dev,
2153                                 "An error occurred in the DASD device driver, "
2154                                 "reason=%s\n", "07");
2155
2156                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2157                         break;
2158
2159                 case 0x1B:      /* unexpected condition during write */
2160
2161                         erp = dasd_3990_erp_action_1B_32(erp, sense);
2162                         break;
2163
2164                 case 0x1C:      /* invalid data */
2165                         dev_emerg(&device->cdev->dev,
2166                                     "Data recovered during retry with PCI "
2167                                     "fetch mode active\n");
2168
2169                         /* not possible to handle this situation in Linux */
2170                         panic
2171                             ("Invalid data - No way to inform application "
2172                              "about the possibly incorrect data");
2173                         break;
2174
2175                 case 0x1D:      /* state-change pending */
2176                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2177                                     "A State change pending condition exists "
2178                                     "for the subsystem or device");
2179
2180                         erp = dasd_3990_erp_action_4(erp, sense);
2181                         break;
2182
2183                 case 0x1E:      /* busy */
2184                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2185                                     "Busy condition exists "
2186                                     "for the subsystem or device");
2187                         erp = dasd_3990_erp_action_4(erp, sense);
2188                         break;
2189
2190                 default:        /* all others errors - default erp  */
2191                         break;
2192                 }
2193         }
2194
2195         return erp;
2196
2197 }                               /* end dasd_3990_erp_inspect_32 */
2198
2199 /*
2200  *****************************************************************************
2201  * main ERP control functions (24 and 32 byte sense)
2202  *****************************************************************************
2203  */
2204
2205 /*
2206  * DASD_3990_ERP_CONTROL_CHECK
2207  *
2208  * DESCRIPTION
2209  *   Does a generic inspection if a control check occurred and sets up
2210  *   the related error recovery procedure
2211  *
2212  * PARAMETER
2213  *   erp                pointer to the currently created default ERP
2214  *
2215  * RETURN VALUES
2216  *   erp_filled         pointer to the erp
2217  */
2218
2219 static struct dasd_ccw_req *
2220 dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
2221 {
2222         struct dasd_device *device = erp->startdev;
2223
2224         if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK
2225                                            | SCHN_STAT_CHN_CTRL_CHK)) {
2226                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2227                             "channel or interface control check");
2228                 erp = dasd_3990_erp_action_4(erp, NULL);
2229         }
2230         return erp;
2231 }
2232
2233 /*
2234  * DASD_3990_ERP_INSPECT
2235  *
2236  * DESCRIPTION
2237  *   Does a detailed inspection for sense data by calling either
2238  *   the 24-byte or the 32-byte inspection routine.
2239  *
2240  * PARAMETER
2241  *   erp                pointer to the currently created default ERP
2242  * RETURN VALUES
2243  *   erp_new            contens was possibly modified
2244  */
2245 static struct dasd_ccw_req *
2246 dasd_3990_erp_inspect(struct dasd_ccw_req *erp)
2247 {
2248
2249         struct dasd_ccw_req *erp_new = NULL;
2250         char *sense;
2251
2252         /* if this problem occurred on an alias retry on base */
2253         erp_new = dasd_3990_erp_inspect_alias(erp);
2254         if (erp_new)
2255                 return erp_new;
2256
2257         /* sense data are located in the refers record of the
2258          * already set up new ERP !
2259          * check if concurrent sens is available
2260          */
2261         sense = dasd_get_sense(&erp->refers->irb);
2262         if (!sense)
2263                 erp_new = dasd_3990_erp_control_check(erp);
2264         /* distinguish between 24 and 32 byte sense data */
2265         else if (sense[27] & DASD_SENSE_BIT_0) {
2266
2267                 /* inspect the 24 byte sense data */
2268                 erp_new = dasd_3990_erp_inspect_24(erp, sense);
2269
2270         } else {
2271
2272                 /* inspect the 32 byte sense data */
2273                 erp_new = dasd_3990_erp_inspect_32(erp, sense);
2274
2275         }       /* end distinguish between 24 and 32 byte sense data */
2276
2277         return erp_new;
2278 }
2279
2280 /*
2281  * DASD_3990_ERP_ADD_ERP
2282  *
2283  * DESCRIPTION
2284  *   This function adds an additional request block (ERP) to the head of
2285  *   the given cqr (or erp).
2286  *   For a command mode cqr the erp is initialized as an default erp
2287  *   (retry TIC).
2288  *   For transport mode we make a copy of the original TCW (points to
2289  *   the original TCCB, TIDALs, etc.) but give it a fresh
2290  *   TSB so the original sense data will not be changed.
2291  *
2292  * PARAMETER
2293  *   cqr                head of the current ERP-chain (or single cqr if
2294  *                      first error)
2295  * RETURN VALUES
2296  *   erp                pointer to new ERP-chain head
2297  */
2298 static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr)
2299 {
2300
2301         struct dasd_device *device = cqr->startdev;
2302         struct ccw1 *ccw;
2303         struct dasd_ccw_req *erp;
2304         int cplength, datasize;
2305         struct tcw *tcw;
2306         struct tsb *tsb;
2307
2308         if (cqr->cpmode == 1) {
2309                 cplength = 0;
2310                 /* TCW needs to be 64 byte aligned, so leave enough room */
2311                 datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb);
2312         } else {
2313                 cplength = 2;
2314                 datasize = 0;
2315         }
2316
2317         /* allocate additional request block */
2318         erp = dasd_alloc_erp_request((char *) &cqr->magic,
2319                                      cplength, datasize, device);
2320         if (IS_ERR(erp)) {
2321                 if (cqr->retries <= 0) {
2322                         DBF_DEV_EVENT(DBF_ERR, device, "%s",
2323                                     "Unable to allocate ERP request");
2324                         cqr->status = DASD_CQR_FAILED;
2325                         cqr->stopclk = get_tod_clock();
2326                 } else {
2327                         DBF_DEV_EVENT(DBF_ERR, device,
2328                                      "Unable to allocate ERP request "
2329                                      "(%i retries left)",
2330                                      cqr->retries);
2331                         dasd_block_set_timer(device->block, (HZ << 3));
2332                 }
2333                 return erp;
2334         }
2335
2336         ccw = cqr->cpaddr;
2337         if (cqr->cpmode == 1) {
2338                 /* make a shallow copy of the original tcw but set new tsb */
2339                 erp->cpmode = 1;
2340                 erp->cpaddr = PTR_ALIGN(erp->data, 64);
2341                 tcw = erp->cpaddr;
2342                 tsb = (struct tsb *) &tcw[1];
2343                 *tcw = *((struct tcw *)cqr->cpaddr);
2344                 tcw->tsb = (long)tsb;
2345         } else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) {
2346                 /* PSF cannot be chained from NOOP/TIC */
2347                 erp->cpaddr = cqr->cpaddr;
2348         } else {
2349                 /* initialize request with default TIC to current ERP/CQR */
2350                 ccw = erp->cpaddr;
2351                 ccw->cmd_code = CCW_CMD_NOOP;
2352                 ccw->flags = CCW_FLAG_CC;
2353                 ccw++;
2354                 ccw->cmd_code = CCW_CMD_TIC;
2355                 ccw->cda      = (long)(cqr->cpaddr);
2356         }
2357
2358         erp->flags = cqr->flags;
2359         erp->function = dasd_3990_erp_add_erp;
2360         erp->refers   = cqr;
2361         erp->startdev = device;
2362         erp->memdev   = device;
2363         erp->block    = cqr->block;
2364         erp->magic    = cqr->magic;
2365         erp->expires  = cqr->expires;
2366         erp->retries  = 256;
2367         erp->buildclk = get_tod_clock();
2368         erp->status = DASD_CQR_FILLED;
2369
2370         return erp;
2371 }
2372
2373 /*
2374  * DASD_3990_ERP_ADDITIONAL_ERP
2375  *
2376  * DESCRIPTION
2377  *   An additional ERP is needed to handle the current error.
2378  *   Add ERP to the head of the ERP-chain containing the ERP processing
2379  *   determined based on the sense data.
2380  *
2381  * PARAMETER
2382  *   cqr                head of the current ERP-chain (or single cqr if
2383  *                      first error)
2384  *
2385  * RETURN VALUES
2386  *   erp                pointer to new ERP-chain head
2387  */
2388 static struct dasd_ccw_req *
2389 dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr)
2390 {
2391
2392         struct dasd_ccw_req *erp = NULL;
2393
2394         /* add erp and initialize with default TIC */
2395         erp = dasd_3990_erp_add_erp(cqr);
2396
2397         if (IS_ERR(erp))
2398                 return erp;
2399
2400         /* inspect sense, determine specific ERP if possible */
2401         if (erp != cqr) {
2402
2403                 erp = dasd_3990_erp_inspect(erp);
2404         }
2405
2406         return erp;
2407
2408 }                               /* end dasd_3990_erp_additional_erp */
2409
2410 /*
2411  * DASD_3990_ERP_ERROR_MATCH
2412  *
2413  * DESCRIPTION
2414  *   Check if the device status of the given cqr is the same.
2415  *   This means that the failed CCW and the relevant sense data
2416  *   must match.
2417  *   I don't distinguish between 24 and 32 byte sense because in case of
2418  *   24 byte sense byte 25 and 27 is set as well.
2419  *
2420  * PARAMETER
2421  *   cqr1               first cqr, which will be compared with the
2422  *   cqr2               second cqr.
2423  *
2424  * RETURN VALUES
2425  *   match              'boolean' for match found
2426  *                      returns 1 if match found, otherwise 0.
2427  */
2428 static int dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1,
2429                                      struct dasd_ccw_req *cqr2)
2430 {
2431         char *sense1, *sense2;
2432
2433         if (cqr1->startdev != cqr2->startdev)
2434                 return 0;
2435
2436         sense1 = dasd_get_sense(&cqr1->irb);
2437         sense2 = dasd_get_sense(&cqr2->irb);
2438
2439         /* one request has sense data, the other not -> no match, return 0 */
2440         if (!sense1 != !sense2)
2441                 return 0;
2442         /* no sense data in both cases -> check cstat for IFCC */
2443         if (!sense1 && !sense2) {
2444                 if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2445                                                     SCHN_STAT_CHN_CTRL_CHK)) ==
2446                     (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2447                                                     SCHN_STAT_CHN_CTRL_CHK)))
2448                         return 1; /* match with ifcc*/
2449         }
2450         /* check sense data; byte 0-2,25,27 */
2451         if (!(sense1 && sense2 &&
2452               (memcmp(sense1, sense2, 3) == 0) &&
2453               (sense1[27] == sense2[27]) &&
2454               (sense1[25] == sense2[25]))) {
2455
2456                 return 0;       /* sense doesn't match */
2457         }
2458
2459         return 1;               /* match */
2460
2461 }                               /* end dasd_3990_erp_error_match */
2462
2463 /*
2464  * DASD_3990_ERP_IN_ERP
2465  *
2466  * DESCRIPTION
2467  *   check if the current error already happened before.
2468  *   quick exit if current cqr is not an ERP (cqr->refers=NULL)
2469  *
2470  * PARAMETER
2471  *   cqr                failed cqr (either original cqr or already an erp)
2472  *
2473  * RETURN VALUES
2474  *   erp                erp-pointer to the already defined error
2475  *                      recovery procedure OR
2476  *                      NULL if a 'new' error occurred.
2477  */
2478 static struct dasd_ccw_req *
2479 dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr)
2480 {
2481
2482         struct dasd_ccw_req *erp_head = cqr,    /* save erp chain head */
2483         *erp_match = NULL;      /* save erp chain head */
2484         int match = 0;          /* 'boolean' for matching error found */
2485
2486         if (cqr->refers == NULL) {      /* return if not in erp */
2487                 return NULL;
2488         }
2489
2490         /* check the erp/cqr chain for current error */
2491         do {
2492                 match = dasd_3990_erp_error_match(erp_head, cqr->refers);
2493                 erp_match = cqr;        /* save possible matching erp  */
2494                 cqr = cqr->refers;      /* check next erp/cqr in queue */
2495
2496         } while ((cqr->refers != NULL) && (!match));
2497
2498         if (!match) {
2499                 return NULL;    /* no match was found */
2500         }
2501
2502         return erp_match;       /* return address of matching erp */
2503
2504 }                               /* END dasd_3990_erp_in_erp */
2505
2506 /*
2507  * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
2508  *
2509  * DESCRIPTION
2510  *   No retry is left for the current ERP. Check what has to be done
2511  *   with the ERP.
2512  *     - do further defined ERP action or
2513  *     - wait for interrupt or
2514  *     - exit with permanent error
2515  *
2516  * PARAMETER
2517  *   erp                ERP which is in progress with no retry left
2518  *
2519  * RETURN VALUES
2520  *   erp                modified/additional ERP
2521  */
2522 static struct dasd_ccw_req *
2523 dasd_3990_erp_further_erp(struct dasd_ccw_req *erp)
2524 {
2525
2526         struct dasd_device *device = erp->startdev;
2527         char *sense = dasd_get_sense(&erp->irb);
2528
2529         /* check for 24 byte sense ERP */
2530         if ((erp->function == dasd_3990_erp_bus_out) ||
2531             (erp->function == dasd_3990_erp_action_1) ||
2532             (erp->function == dasd_3990_erp_action_4)) {
2533
2534                 erp = dasd_3990_erp_action_1(erp);
2535
2536         } else if (erp->function == dasd_3990_erp_action_1_sec) {
2537                 erp = dasd_3990_erp_action_1_sec(erp);
2538         } else if (erp->function == dasd_3990_erp_action_5) {
2539
2540                 /* retries have not been successful */
2541                 /* prepare erp for retry on different channel path */
2542                 erp = dasd_3990_erp_action_1(erp);
2543
2544                 if (sense && !(sense[2] & DASD_SENSE_BIT_0)) {
2545
2546                         /* issue a Diagnostic Control command with an
2547                          * Inhibit Write subcommand */
2548
2549                         switch (sense[25]) {
2550                         case 0x17:
2551                         case 0x57:{     /* controller */
2552                                         erp = dasd_3990_erp_DCTL(erp, 0x20);
2553                                         break;
2554                                 }
2555                         case 0x18:
2556                         case 0x58:{     /* channel path */
2557                                         erp = dasd_3990_erp_DCTL(erp, 0x40);
2558                                         break;
2559                                 }
2560                         case 0x19:
2561                         case 0x59:{     /* storage director */
2562                                         erp = dasd_3990_erp_DCTL(erp, 0x80);
2563                                         break;
2564                                 }
2565                         default:
2566                                 DBF_DEV_EVENT(DBF_WARNING, device,
2567                                             "invalid subcommand modifier 0x%x "
2568                                             "for Diagnostic Control Command",
2569                                             sense[25]);
2570                         }
2571                 }
2572
2573                 /* check for 32 byte sense ERP */
2574         } else if (sense &&
2575                    ((erp->function == dasd_3990_erp_compound_retry) ||
2576                     (erp->function == dasd_3990_erp_compound_path) ||
2577                     (erp->function == dasd_3990_erp_compound_code) ||
2578                     (erp->function == dasd_3990_erp_compound_config))) {
2579
2580                 erp = dasd_3990_erp_compound(erp, sense);
2581
2582         } else {
2583                 /*
2584                  * No retry left and no additional special handling
2585                  * necessary
2586                  */
2587                 dev_err(&device->cdev->dev,
2588                         "ERP %p has run out of retries and failed\n", erp);
2589
2590                 erp->status = DASD_CQR_FAILED;
2591         }
2592
2593         return erp;
2594
2595 }                               /* end dasd_3990_erp_further_erp */
2596
2597 /*
2598  * DASD_3990_ERP_HANDLE_MATCH_ERP
2599  *
2600  * DESCRIPTION
2601  *   An error occurred again and an ERP has been detected which is already
2602  *   used to handle this error (e.g. retries).
2603  *   All prior ERP's are asumed to be successful and therefore removed
2604  *   from queue.
2605  *   If retry counter of matching erp is already 0, it is checked if further
2606  *   action is needed (besides retry) or if the ERP has failed.
2607  *
2608  * PARAMETER
2609  *   erp_head           first ERP in ERP-chain
2610  *   erp                ERP that handles the actual error.
2611  *                      (matching erp)
2612  *
2613  * RETURN VALUES
2614  *   erp                modified/additional ERP
2615  */
2616 static struct dasd_ccw_req *
2617 dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head,
2618                                struct dasd_ccw_req *erp)
2619 {
2620
2621         struct dasd_device *device = erp_head->startdev;
2622         struct dasd_ccw_req *erp_done = erp_head;       /* finished req */
2623         struct dasd_ccw_req *erp_free = NULL;   /* req to be freed */
2624
2625         /* loop over successful ERPs and remove them from chanq */
2626         while (erp_done != erp) {
2627
2628                 if (erp_done == NULL)   /* end of chain reached */
2629                         panic(PRINTK_HEADER "Programming error in ERP! The "
2630                               "original request was lost\n");
2631
2632                 /* remove the request from the device queue */
2633                 list_del(&erp_done->blocklist);
2634
2635                 erp_free = erp_done;
2636                 erp_done = erp_done->refers;
2637
2638                 /* free the finished erp request */
2639                 dasd_free_erp_request(erp_free, erp_free->memdev);
2640
2641         }                       /* end while */
2642
2643         if (erp->retries > 0) {
2644
2645                 char *sense = dasd_get_sense(&erp->refers->irb);
2646
2647                 /* check for special retries */
2648                 if (sense && erp->function == dasd_3990_erp_action_4) {
2649
2650                         erp = dasd_3990_erp_action_4(erp, sense);
2651
2652                 } else if (sense &&
2653                            erp->function == dasd_3990_erp_action_1B_32) {
2654
2655                         erp = dasd_3990_update_1B(erp, sense);
2656
2657                 } else if (sense && erp->function == dasd_3990_erp_int_req) {
2658
2659                         erp = dasd_3990_erp_int_req(erp);
2660
2661                 } else {
2662                         /* simple retry   */
2663                         DBF_DEV_EVENT(DBF_DEBUG, device,
2664                                     "%i retries left for erp %p",
2665                                     erp->retries, erp);
2666
2667                         /* handle the request again... */
2668                         erp->status = DASD_CQR_FILLED;
2669                 }
2670
2671         } else {
2672                 /* no retry left - check for further necessary action    */
2673                 /* if no further actions, handle rest as permanent error */
2674                 erp = dasd_3990_erp_further_erp(erp);
2675         }
2676
2677         return erp;
2678
2679 }                               /* end dasd_3990_erp_handle_match_erp */
2680
2681 /*
2682  * DASD_3990_ERP_ACTION
2683  *
2684  * DESCRIPTION
2685  *   control routine for 3990 erp actions.
2686  *   Has to be called with the queue lock (namely the s390_irq_lock) acquired.
2687  *
2688  * PARAMETER
2689  *   cqr                failed cqr (either original cqr or already an erp)
2690  *
2691  * RETURN VALUES
2692  *   erp                erp-pointer to the head of the ERP action chain.
2693  *                      This means:
2694  *                       - either a ptr to an additional ERP cqr or
2695  *                       - the original given cqr (which's status might
2696  *                         be modified)
2697  */
2698 struct dasd_ccw_req *
2699 dasd_3990_erp_action(struct dasd_ccw_req * cqr)
2700 {
2701         struct dasd_ccw_req *erp = NULL;
2702         struct dasd_device *device = cqr->startdev;
2703         struct dasd_ccw_req *temp_erp = NULL;
2704
2705         if (device->features & DASD_FEATURE_ERPLOG) {
2706                 /* print current erp_chain */
2707                 dev_err(&device->cdev->dev,
2708                             "ERP chain at BEGINNING of ERP-ACTION\n");
2709                 for (temp_erp = cqr;
2710                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2711
2712                         dev_err(&device->cdev->dev,
2713                                     "ERP %p (%02x) refers to %p\n",
2714                                     temp_erp, temp_erp->status,
2715                                     temp_erp->refers);
2716                 }
2717         }
2718
2719         /* double-check if current erp/cqr was successful */
2720         if ((scsw_cstat(&cqr->irb.scsw) == 0x00) &&
2721             (scsw_dstat(&cqr->irb.scsw) ==
2722              (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
2723
2724                 DBF_DEV_EVENT(DBF_DEBUG, device,
2725                             "ERP called for successful request %p"
2726                             " - NO ERP necessary", cqr);
2727
2728                 cqr->status = DASD_CQR_DONE;
2729
2730                 return cqr;
2731         }
2732
2733         /* check if error happened before */
2734         erp = dasd_3990_erp_in_erp(cqr);
2735
2736         if (erp == NULL) {
2737                 /* no matching erp found - set up erp */
2738                 erp = dasd_3990_erp_additional_erp(cqr);
2739                 if (IS_ERR(erp))
2740                         return erp;
2741         } else {
2742                 /* matching erp found - set all leading erp's to DONE */
2743                 erp = dasd_3990_erp_handle_match_erp(cqr, erp);
2744         }
2745
2746         if (device->features & DASD_FEATURE_ERPLOG) {
2747                 /* print current erp_chain */
2748                 dev_err(&device->cdev->dev,
2749                             "ERP chain at END of ERP-ACTION\n");
2750                 for (temp_erp = erp;
2751                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2752
2753                         dev_err(&device->cdev->dev,
2754                                     "ERP %p (%02x) refers to %p\n",
2755                                     temp_erp, temp_erp->status,
2756                                     temp_erp->refers);
2757                 }
2758         }
2759
2760         /* enqueue ERP request if it's a new one */
2761         if (list_empty(&erp->blocklist)) {
2762                 cqr->status = DASD_CQR_IN_ERP;
2763                 /* add erp request before the cqr */
2764                 list_add_tail(&erp->blocklist, &cqr->blocklist);
2765         }
2766
2767
2768
2769         return erp;
2770
2771 }                               /* end dasd_3990_erp_action */