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 = dasd_path_get_opm(device) &
 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 = dasd_path_get_opm(erp->startdev);
 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 sync 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 sync 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 F - 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                 if (!test_bit(DASD_CQR_SUPPRESS_CR, &erp->flags))
1056                         dev_err(&device->cdev->dev,
1057                                 "An error occurred in the DASD device driver, reason=09\n");
1058
1059                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1060         }
1061
1062         return erp;
1063
1064 }                               /* end dasd_3990_erp_com_rej */
1065
1066 /*
1067  * DASD_3990_ERP_BUS_OUT
1068  *
1069  * DESCRIPTION
1070  *   Handles 24 byte 'Bus Out Parity Check' error.
1071  *
1072  * PARAMETER
1073  *   erp                current erp_head
1074  * RETURN VALUES
1075  *   erp                new erp_head - pointer to new ERP
1076  */
1077 static struct dasd_ccw_req *
1078 dasd_3990_erp_bus_out(struct dasd_ccw_req * erp)
1079 {
1080
1081         struct dasd_device *device = erp->startdev;
1082
1083         /* first time set initial retry counter and erp_function */
1084         /* and retry once without blocking queue                 */
1085         /* (this enables easier enqueing of the cqr)             */
1086         if (erp->function != dasd_3990_erp_bus_out) {
1087                 erp->retries = 256;
1088                 erp->function = dasd_3990_erp_bus_out;
1089
1090         } else {
1091
1092                 /* issue a message and wait for 'device ready' interrupt */
1093                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1094                             "bus out parity error or BOPC requested by "
1095                             "channel");
1096
1097                 dasd_3990_erp_block_queue(erp, 60*HZ);
1098
1099         }
1100
1101         return erp;
1102
1103 }                               /* end dasd_3990_erp_bus_out */
1104
1105 /*
1106  * DASD_3990_ERP_EQUIP_CHECK
1107  *
1108  * DESCRIPTION
1109  *   Handles 24 byte 'Equipment Check' error.
1110  *
1111  * PARAMETER
1112  *   erp                current erp_head
1113  * RETURN VALUES
1114  *   erp                new erp_head - pointer to new ERP
1115  */
1116 static struct dasd_ccw_req *
1117 dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense)
1118 {
1119
1120         struct dasd_device *device = erp->startdev;
1121
1122         erp->function = dasd_3990_erp_equip_check;
1123
1124         if (sense[1] & SNS1_WRITE_INHIBITED) {
1125                 dev_info(&device->cdev->dev,
1126                             "Write inhibited path encountered\n");
1127
1128                 /* vary path offline
1129                    internal error 04 - Path should be varied off-line.*/
1130                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1131                         "device driver, reason=%s\n", "04");
1132
1133                 erp = dasd_3990_erp_action_1(erp);
1134
1135         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1136
1137                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1138                             "Equipment Check - " "environmental data present");
1139
1140                 dasd_3990_handle_env_data(erp, sense);
1141
1142                 erp = dasd_3990_erp_action_4(erp, sense);
1143
1144         } else if (sense[1] & SNS1_PERM_ERR) {
1145
1146                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1147                             "Equipment Check - retry exhausted or "
1148                             "undesirable");
1149
1150                 erp = dasd_3990_erp_action_1(erp);
1151
1152         } else {
1153                 /* all other equipment checks - Action 5 */
1154                 /* rest is done when retries == 0 */
1155                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1156                             "Equipment check or processing error");
1157
1158                 erp = dasd_3990_erp_action_5(erp);
1159         }
1160         return erp;
1161
1162 }                               /* end dasd_3990_erp_equip_check */
1163
1164 /*
1165  * DASD_3990_ERP_DATA_CHECK
1166  *
1167  * DESCRIPTION
1168  *   Handles 24 byte 'Data Check' error.
1169  *
1170  * PARAMETER
1171  *   erp                current erp_head
1172  * RETURN VALUES
1173  *   erp                new erp_head - pointer to new ERP
1174  */
1175 static struct dasd_ccw_req *
1176 dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense)
1177 {
1178
1179         struct dasd_device *device = erp->startdev;
1180
1181         erp->function = dasd_3990_erp_data_check;
1182
1183         if (sense[2] & SNS2_CORRECTABLE) {      /* correctable data check */
1184
1185                 /* issue message that the data has been corrected */
1186                 dev_emerg(&device->cdev->dev,
1187                             "Data recovered during retry with PCI "
1188                             "fetch mode active\n");
1189
1190                 /* not possible to handle this situation in Linux */
1191                 panic("No way to inform application about the possibly "
1192                       "incorrect data");
1193
1194         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1195
1196                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1197                             "Uncorrectable data check recovered secondary "
1198                             "addr of duplex pair");
1199
1200                 erp = dasd_3990_erp_action_4(erp, sense);
1201
1202         } else if (sense[1] & SNS1_PERM_ERR) {
1203
1204                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1205                             "Uncorrectable data check with internal "
1206                             "retry exhausted");
1207
1208                 erp = dasd_3990_erp_action_1(erp);
1209
1210         } else {
1211                 /* all other data checks */
1212                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1213                             "Uncorrectable data check with retry count "
1214                             "exhausted...");
1215
1216                 erp = dasd_3990_erp_action_5(erp);
1217         }
1218
1219         return erp;
1220
1221 }                               /* end dasd_3990_erp_data_check */
1222
1223 /*
1224  * DASD_3990_ERP_OVERRUN
1225  *
1226  * DESCRIPTION
1227  *   Handles 24 byte 'Overrun' error.
1228  *
1229  * PARAMETER
1230  *   erp                current erp_head
1231  * RETURN VALUES
1232  *   erp                new erp_head - pointer to new ERP
1233  */
1234 static struct dasd_ccw_req *
1235 dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense)
1236 {
1237
1238         struct dasd_device *device = erp->startdev;
1239
1240         erp->function = dasd_3990_erp_overrun;
1241
1242         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1243                     "Overrun - service overrun or overrun"
1244                     " error requested by channel");
1245
1246         erp = dasd_3990_erp_action_5(erp);
1247
1248         return erp;
1249
1250 }                               /* end dasd_3990_erp_overrun */
1251
1252 /*
1253  * DASD_3990_ERP_INV_FORMAT
1254  *
1255  * DESCRIPTION
1256  *   Handles 24 byte 'Invalid Track Format' error.
1257  *
1258  * PARAMETER
1259  *   erp                current erp_head
1260  * RETURN VALUES
1261  *   erp                new erp_head - pointer to new ERP
1262  */
1263 static struct dasd_ccw_req *
1264 dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense)
1265 {
1266
1267         struct dasd_device *device = erp->startdev;
1268
1269         erp->function = dasd_3990_erp_inv_format;
1270
1271         if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1272
1273                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1274                             "Track format error when destaging or "
1275                             "staging data");
1276
1277                 dasd_3990_handle_env_data(erp, sense);
1278
1279                 erp = dasd_3990_erp_action_4(erp, sense);
1280
1281         } else {
1282                 /* internal error 06 - The track format is not valid*/
1283                 dev_err(&device->cdev->dev,
1284                         "An error occurred in the DASD device driver, "
1285                         "reason=%s\n", "06");
1286
1287                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1288         }
1289
1290         return erp;
1291
1292 }                               /* end dasd_3990_erp_inv_format */
1293
1294 /*
1295  * DASD_3990_ERP_EOC
1296  *
1297  * DESCRIPTION
1298  *   Handles 24 byte 'End-of-Cylinder' error.
1299  *
1300  * PARAMETER
1301  *   erp                already added default erp
1302  * RETURN VALUES
1303  *   erp                pointer to original (failed) cqr.
1304  */
1305 static struct dasd_ccw_req *
1306 dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense)
1307 {
1308
1309         struct dasd_device *device = default_erp->startdev;
1310
1311         dev_err(&device->cdev->dev,
1312                 "The cylinder data for accessing the DASD is inconsistent\n");
1313
1314         /* implement action 7 - BUG */
1315         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1316
1317 }                               /* end dasd_3990_erp_EOC */
1318
1319 /*
1320  * DASD_3990_ERP_ENV_DATA
1321  *
1322  * DESCRIPTION
1323  *   Handles 24 byte 'Environmental-Data Present' error.
1324  *
1325  * PARAMETER
1326  *   erp                current erp_head
1327  * RETURN VALUES
1328  *   erp                new erp_head - pointer to new ERP
1329  */
1330 static struct dasd_ccw_req *
1331 dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense)
1332 {
1333
1334         struct dasd_device *device = erp->startdev;
1335
1336         erp->function = dasd_3990_erp_env_data;
1337
1338         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Environmental data present");
1339
1340         dasd_3990_handle_env_data(erp, sense);
1341
1342         /* don't retry on disabled interface */
1343         if (sense[7] != 0x0F) {
1344                 erp = dasd_3990_erp_action_4(erp, sense);
1345         } else {
1346                 erp->status = DASD_CQR_FILLED;
1347         }
1348
1349         return erp;
1350
1351 }                               /* end dasd_3990_erp_env_data */
1352
1353 /*
1354  * DASD_3990_ERP_NO_REC
1355  *
1356  * DESCRIPTION
1357  *   Handles 24 byte 'No Record Found' error.
1358  *
1359  * PARAMETER
1360  *   erp                already added default ERP
1361  *
1362  * RETURN VALUES
1363  *   erp                new erp_head - pointer to new ERP
1364  */
1365 static struct dasd_ccw_req *
1366 dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense)
1367 {
1368
1369         struct dasd_device *device = default_erp->startdev;
1370
1371         /*
1372          * In some cases the 'No Record Found' error might be expected and
1373          * log messages shouldn't be written then.
1374          * Check if the according suppress bit is set.
1375          */
1376         if (!test_bit(DASD_CQR_SUPPRESS_NRF, &default_erp->flags))
1377                 dev_err(&device->cdev->dev,
1378                         "The specified record was not found\n");
1379
1380         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1381
1382 }                               /* end dasd_3990_erp_no_rec */
1383
1384 /*
1385  * DASD_3990_ERP_FILE_PROT
1386  *
1387  * DESCRIPTION
1388  *   Handles 24 byte 'File Protected' error.
1389  *   Note: Seek related recovery is not implemented because
1390  *         wee don't use the seek command yet.
1391  *
1392  * PARAMETER
1393  *   erp                current erp_head
1394  * RETURN VALUES
1395  *   erp                new erp_head - pointer to new ERP
1396  */
1397 static struct dasd_ccw_req *
1398 dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
1399 {
1400
1401         struct dasd_device *device = erp->startdev;
1402
1403         /*
1404          * In some cases the 'File Protected' error might be expected and
1405          * log messages shouldn't be written then.
1406          * Check if the according suppress bit is set.
1407          */
1408         if (!test_bit(DASD_CQR_SUPPRESS_FP, &erp->flags))
1409                 dev_err(&device->cdev->dev,
1410                         "Accessing the DASD failed because of a hardware error\n");
1411
1412         return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1413
1414 }                               /* end dasd_3990_erp_file_prot */
1415
1416 /*
1417  * DASD_3990_ERP_INSPECT_ALIAS
1418  *
1419  * DESCRIPTION
1420  *   Checks if the original request was started on an alias device.
1421  *   If yes, it modifies the original and the erp request so that
1422  *   the erp request can be started on a base device.
1423  *
1424  * PARAMETER
1425  *   erp                pointer to the currently created default ERP
1426  *
1427  * RETURN VALUES
1428  *   erp                pointer to the modified ERP, or NULL
1429  */
1430
1431 static struct dasd_ccw_req *dasd_3990_erp_inspect_alias(
1432                                                 struct dasd_ccw_req *erp)
1433 {
1434         struct dasd_ccw_req *cqr = erp->refers;
1435         char *sense;
1436
1437         if (cqr->block &&
1438             (cqr->block->base != cqr->startdev)) {
1439
1440                 sense = dasd_get_sense(&erp->refers->irb);
1441                 /*
1442                  * dynamic pav may have changed base alias mapping
1443                  */
1444                 if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense
1445                     && (sense[0] == 0x10) && (sense[7] == 0x0F)
1446                     && (sense[8] == 0x67)) {
1447                         /*
1448                          * remove device from alias handling to prevent new
1449                          * requests from being scheduled on the
1450                          * wrong alias device
1451                          */
1452                         dasd_alias_remove_device(cqr->startdev);
1453
1454                         /* schedule worker to reload device */
1455                         dasd_reload_device(cqr->startdev);
1456                 }
1457
1458                 if (cqr->startdev->features & DASD_FEATURE_ERPLOG) {
1459                         DBF_DEV_EVENT(DBF_ERR, cqr->startdev,
1460                                     "ERP on alias device for request %p,"
1461                                     " recover on base device %s", cqr,
1462                                     dev_name(&cqr->block->base->cdev->dev));
1463                 }
1464                 dasd_eckd_reset_ccw_to_base_io(cqr);
1465                 erp->startdev = cqr->block->base;
1466                 erp->function = dasd_3990_erp_inspect_alias;
1467                 return erp;
1468         } else
1469                 return NULL;
1470 }
1471
1472
1473 /*
1474  * DASD_3990_ERP_INSPECT_24
1475  *
1476  * DESCRIPTION
1477  *   Does a detailed inspection of the 24 byte sense data
1478  *   and sets up a related error recovery action.
1479  *
1480  * PARAMETER
1481  *   sense              sense data of the actual error
1482  *   erp                pointer to the currently created default ERP
1483  *
1484  * RETURN VALUES
1485  *   erp                pointer to the (addtitional) ERP
1486  */
1487 static struct dasd_ccw_req *
1488 dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense)
1489 {
1490
1491         struct dasd_ccw_req *erp_filled = NULL;
1492
1493         /* Check sense for ....    */
1494         /* 'Command Reject'        */
1495         if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) {
1496                 erp_filled = dasd_3990_erp_com_rej(erp, sense);
1497         }
1498         /* 'Intervention Required' */
1499         if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) {
1500                 erp_filled = dasd_3990_erp_int_req(erp);
1501         }
1502         /* 'Bus Out Parity Check'  */
1503         if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) {
1504                 erp_filled = dasd_3990_erp_bus_out(erp);
1505         }
1506         /* 'Equipment Check'       */
1507         if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) {
1508                 erp_filled = dasd_3990_erp_equip_check(erp, sense);
1509         }
1510         /* 'Data Check'            */
1511         if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) {
1512                 erp_filled = dasd_3990_erp_data_check(erp, sense);
1513         }
1514         /* 'Overrun'               */
1515         if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) {
1516                 erp_filled = dasd_3990_erp_overrun(erp, sense);
1517         }
1518         /* 'Invalid Track Format'  */
1519         if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) {
1520                 erp_filled = dasd_3990_erp_inv_format(erp, sense);
1521         }
1522         /* 'End-of-Cylinder'       */
1523         if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) {
1524                 erp_filled = dasd_3990_erp_EOC(erp, sense);
1525         }
1526         /* 'Environmental Data'    */
1527         if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) {
1528                 erp_filled = dasd_3990_erp_env_data(erp, sense);
1529         }
1530         /* 'No Record Found'       */
1531         if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) {
1532                 erp_filled = dasd_3990_erp_no_rec(erp, sense);
1533         }
1534         /* 'File Protected'        */
1535         if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) {
1536                 erp_filled = dasd_3990_erp_file_prot(erp);
1537         }
1538         /* other (unknown) error - do default ERP */
1539         if (erp_filled == NULL) {
1540
1541                 erp_filled = erp;
1542         }
1543
1544         return erp_filled;
1545
1546 }                               /* END dasd_3990_erp_inspect_24 */
1547
1548 /*
1549  *****************************************************************************
1550  * 32 byte sense ERP functions (only)
1551  *****************************************************************************
1552  */
1553
1554 /*
1555  * DASD_3990_ERPACTION_10_32
1556  *
1557  * DESCRIPTION
1558  *   Handles 32 byte 'Action 10' of Single Program Action Codes.
1559  *   Just retry and if retry doesn't work, return with error.
1560  *
1561  * PARAMETER
1562  *   erp                current erp_head
1563  *   sense              current sense data
1564  * RETURN VALUES
1565  *   erp                modified erp_head
1566  */
1567 static struct dasd_ccw_req *
1568 dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense)
1569 {
1570
1571         struct dasd_device *device = erp->startdev;
1572
1573         erp->retries = 256;
1574         erp->function = dasd_3990_erp_action_10_32;
1575
1576         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Perform logging requested");
1577
1578         return erp;
1579
1580 }                               /* end dasd_3990_erp_action_10_32 */
1581
1582 /*
1583  * DASD_3990_ERP_ACTION_1B_32
1584  *
1585  * DESCRIPTION
1586  *   Handles 32 byte 'Action 1B' of Single Program Action Codes.
1587  *   A write operation could not be finished because of an unexpected
1588  *   condition.
1589  *   The already created 'default erp' is used to get the link to
1590  *   the erp chain, but it can not be used for this recovery
1591  *   action because it contains no DE/LO data space.
1592  *
1593  * PARAMETER
1594  *   default_erp        already added default erp.
1595  *   sense              current sense data
1596  *
1597  * RETURN VALUES
1598  *   erp                new erp or
1599  *                      default_erp in case of imprecise ending or error
1600  */
1601 static struct dasd_ccw_req *
1602 dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
1603 {
1604
1605         struct dasd_device *device = default_erp->startdev;
1606         __u32 cpa = 0;
1607         struct dasd_ccw_req *cqr;
1608         struct dasd_ccw_req *erp;
1609         struct DE_eckd_data *DE_data;
1610         struct PFX_eckd_data *PFX_data;
1611         char *LO_data;          /* LO_eckd_data_t */
1612         struct ccw1 *ccw, *oldccw;
1613
1614         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1615                     "Write not finished because of unexpected condition");
1616
1617         default_erp->function = dasd_3990_erp_action_1B_32;
1618
1619         /* determine the original cqr */
1620         cqr = default_erp;
1621
1622         while (cqr->refers != NULL) {
1623                 cqr = cqr->refers;
1624         }
1625
1626         if (scsw_is_tm(&cqr->irb.scsw)) {
1627                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1628                               "32 bit sense, action 1B is not defined"
1629                               " in transport mode - just retry");
1630                 return default_erp;
1631         }
1632
1633         /* for imprecise ending just do default erp */
1634         if (sense[1] & 0x01) {
1635                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1636                             "Imprecise ending is set - just retry");
1637
1638                 return default_erp;
1639         }
1640
1641         /* determine the address of the CCW to be restarted */
1642         /* Imprecise ending is not set -> addr from IRB-SCSW */
1643         cpa = default_erp->refers->irb.scsw.cmd.cpa;
1644
1645         if (cpa == 0) {
1646                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1647                             "Unable to determine address of the CCW "
1648                             "to be restarted");
1649
1650                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1651         }
1652
1653         /* Build new ERP request including DE/LO */
1654         erp = dasd_alloc_erp_request((char *) &cqr->magic,
1655                                      2 + 1,/* DE/LO + TIC */
1656                                      sizeof(struct DE_eckd_data) +
1657                                      sizeof(struct LO_eckd_data), device);
1658
1659         if (IS_ERR(erp)) {
1660                 /* internal error 01 - Unable to allocate ERP */
1661                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1662                         "device driver, reason=%s\n", "01");
1663                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1664         }
1665
1666         /* use original DE */
1667         DE_data = erp->data;
1668         oldccw = cqr->cpaddr;
1669         if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) {
1670                 PFX_data = cqr->data;
1671                 memcpy(DE_data, &PFX_data->define_extent,
1672                        sizeof(struct DE_eckd_data));
1673         } else
1674                 memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data));
1675
1676         /* create LO */
1677         LO_data = erp->data + sizeof(struct DE_eckd_data);
1678
1679         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1680                 /* should not */
1681                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1682         }
1683
1684         if ((sense[7] & 0x3F) == 0x01) {
1685                 /* operation code is WRITE DATA -> data area orientation */
1686                 LO_data[0] = 0x81;
1687
1688         } else if ((sense[7] & 0x3F) == 0x03) {
1689                 /* operation code is FORMAT WRITE -> index orientation */
1690                 LO_data[0] = 0xC3;
1691
1692         } else {
1693                 LO_data[0] = sense[7];  /* operation */
1694         }
1695
1696         LO_data[1] = sense[8];  /* auxiliary */
1697         LO_data[2] = sense[9];
1698         LO_data[3] = sense[3];  /* count */
1699         LO_data[4] = sense[29]; /* seek_addr.cyl */
1700         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1701         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1702
1703         memcpy(&(LO_data[8]), &(sense[11]), 8);
1704
1705         /* create DE ccw */
1706         ccw = erp->cpaddr;
1707         memset(ccw, 0, sizeof(struct ccw1));
1708         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
1709         ccw->flags = CCW_FLAG_CC;
1710         ccw->count = 16;
1711         ccw->cda = (__u32)(addr_t) DE_data;
1712
1713         /* create LO ccw */
1714         ccw++;
1715         memset(ccw, 0, sizeof(struct ccw1));
1716         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
1717         ccw->flags = CCW_FLAG_CC;
1718         ccw->count = 16;
1719         ccw->cda = (__u32)(addr_t) LO_data;
1720
1721         /* TIC to the failed ccw */
1722         ccw++;
1723         ccw->cmd_code = CCW_CMD_TIC;
1724         ccw->cda = cpa;
1725
1726         /* fill erp related fields */
1727         erp->flags = default_erp->flags;
1728         erp->function = dasd_3990_erp_action_1B_32;
1729         erp->refers = default_erp->refers;
1730         erp->startdev = device;
1731         erp->memdev = device;
1732         erp->magic = default_erp->magic;
1733         erp->expires = default_erp->expires;
1734         erp->retries = 256;
1735         erp->buildclk = get_tod_clock();
1736         erp->status = DASD_CQR_FILLED;
1737
1738         /* remove the default erp */
1739         dasd_free_erp_request(default_erp, device);
1740
1741         return erp;
1742
1743 }                               /* end dasd_3990_erp_action_1B_32 */
1744
1745 /*
1746  * DASD_3990_UPDATE_1B
1747  *
1748  * DESCRIPTION
1749  *   Handles the update to the 32 byte 'Action 1B' of Single Program
1750  *   Action Codes in case the first action was not successful.
1751  *   The already created 'previous_erp' is the currently not successful
1752  *   ERP.
1753  *
1754  * PARAMETER
1755  *   previous_erp       already created previous erp.
1756  *   sense              current sense data
1757  * RETURN VALUES
1758  *   erp                modified erp
1759  */
1760 static struct dasd_ccw_req *
1761 dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense)
1762 {
1763
1764         struct dasd_device *device = previous_erp->startdev;
1765         __u32 cpa = 0;
1766         struct dasd_ccw_req *cqr;
1767         struct dasd_ccw_req *erp;
1768         char *LO_data;          /* struct LO_eckd_data */
1769         struct ccw1 *ccw;
1770
1771         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1772                     "Write not finished because of unexpected condition"
1773                     " - follow on");
1774
1775         /* determine the original cqr */
1776         cqr = previous_erp;
1777
1778         while (cqr->refers != NULL) {
1779                 cqr = cqr->refers;
1780         }
1781
1782         if (scsw_is_tm(&cqr->irb.scsw)) {
1783                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1784                               "32 bit sense, action 1B, update,"
1785                               " in transport mode - just retry");
1786                 return previous_erp;
1787         }
1788
1789         /* for imprecise ending just do default erp */
1790         if (sense[1] & 0x01) {
1791                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1792                             "Imprecise ending is set - just retry");
1793
1794                 previous_erp->status = DASD_CQR_FILLED;
1795
1796                 return previous_erp;
1797         }
1798
1799         /* determine the address of the CCW to be restarted */
1800         /* Imprecise ending is not set -> addr from IRB-SCSW */
1801         cpa = previous_erp->irb.scsw.cmd.cpa;
1802
1803         if (cpa == 0) {
1804                 /* internal error 02 -
1805                    Unable to determine address of the CCW to be restarted */
1806                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1807                         "device driver, reason=%s\n", "02");
1808
1809                 previous_erp->status = DASD_CQR_FAILED;
1810
1811                 return previous_erp;
1812         }
1813
1814         erp = previous_erp;
1815
1816         /* update the LO with the new returned sense data  */
1817         LO_data = erp->data + sizeof(struct DE_eckd_data);
1818
1819         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1820                 /* should not happen */
1821                 previous_erp->status = DASD_CQR_FAILED;
1822
1823                 return previous_erp;
1824         }
1825
1826         if ((sense[7] & 0x3F) == 0x01) {
1827                 /* operation code is WRITE DATA -> data area orientation */
1828                 LO_data[0] = 0x81;
1829
1830         } else if ((sense[7] & 0x3F) == 0x03) {
1831                 /* operation code is FORMAT WRITE -> index orientation */
1832                 LO_data[0] = 0xC3;
1833
1834         } else {
1835                 LO_data[0] = sense[7];  /* operation */
1836         }
1837
1838         LO_data[1] = sense[8];  /* auxiliary */
1839         LO_data[2] = sense[9];
1840         LO_data[3] = sense[3];  /* count */
1841         LO_data[4] = sense[29]; /* seek_addr.cyl */
1842         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1843         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1844
1845         memcpy(&(LO_data[8]), &(sense[11]), 8);
1846
1847         /* TIC to the failed ccw */
1848         ccw = erp->cpaddr;      /* addr of DE ccw */
1849         ccw++;                  /* addr of LE ccw */
1850         ccw++;                  /* addr of TIC ccw */
1851         ccw->cda = cpa;
1852
1853         erp->status = DASD_CQR_FILLED;
1854
1855         return erp;
1856
1857 }                               /* end dasd_3990_update_1B */
1858
1859 /*
1860  * DASD_3990_ERP_COMPOUND_RETRY
1861  *
1862  * DESCRIPTION
1863  *   Handles the compound ERP action retry code.
1864  *   NOTE: At least one retry is done even if zero is specified
1865  *         by the sense data. This makes enqueueing of the request
1866  *         easier.
1867  *
1868  * PARAMETER
1869  *   sense              sense data of the actual error
1870  *   erp                pointer to the currently created ERP
1871  *
1872  * RETURN VALUES
1873  *   erp                modified ERP pointer
1874  *
1875  */
1876 static void
1877 dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
1878 {
1879
1880         switch (sense[25] & 0x03) {
1881         case 0x00:              /* no not retry */
1882                 erp->retries = 1;
1883                 break;
1884
1885         case 0x01:              /* retry 2 times */
1886                 erp->retries = 2;
1887                 break;
1888
1889         case 0x02:              /* retry 10 times */
1890                 erp->retries = 10;
1891                 break;
1892
1893         case 0x03:              /* retry 256 times */
1894                 erp->retries = 256;
1895                 break;
1896
1897         default:
1898                 BUG();
1899         }
1900
1901         erp->function = dasd_3990_erp_compound_retry;
1902
1903 }                               /* end dasd_3990_erp_compound_retry */
1904
1905 /*
1906  * DASD_3990_ERP_COMPOUND_PATH
1907  *
1908  * DESCRIPTION
1909  *   Handles the compound ERP action for retry on alternate
1910  *   channel path.
1911  *
1912  * PARAMETER
1913  *   sense              sense data of the actual error
1914  *   erp                pointer to the currently created ERP
1915  *
1916  * RETURN VALUES
1917  *   erp                modified ERP pointer
1918  *
1919  */
1920 static void
1921 dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
1922 {
1923         if (sense[25] & DASD_SENSE_BIT_3) {
1924                 dasd_3990_erp_alternate_path(erp);
1925
1926                 if (erp->status == DASD_CQR_FAILED &&
1927                     !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
1928                         /* reset the lpm and the status to be able to
1929                          * try further actions. */
1930                         erp->lpm = dasd_path_get_opm(erp->startdev);
1931                         erp->status = DASD_CQR_NEED_ERP;
1932                 }
1933         }
1934
1935         erp->function = dasd_3990_erp_compound_path;
1936
1937 }                               /* end dasd_3990_erp_compound_path */
1938
1939 /*
1940  * DASD_3990_ERP_COMPOUND_CODE
1941  *
1942  * DESCRIPTION
1943  *   Handles the compound ERP action for retry code.
1944  *
1945  * PARAMETER
1946  *   sense              sense data of the actual error
1947  *   erp                pointer to the currently created ERP
1948  *
1949  * RETURN VALUES
1950  *   erp                NEW ERP pointer
1951  *
1952  */
1953 static struct dasd_ccw_req *
1954 dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense)
1955 {
1956
1957         if (sense[25] & DASD_SENSE_BIT_2) {
1958
1959                 switch (sense[28]) {
1960                 case 0x17:
1961                         /* issue a Diagnostic Control command with an
1962                          * Inhibit Write subcommand and controller modifier */
1963                         erp = dasd_3990_erp_DCTL(erp, 0x20);
1964                         break;
1965
1966                 case 0x25:
1967                         /* wait for 5 seconds and retry again */
1968                         erp->retries = 1;
1969
1970                         dasd_3990_erp_block_queue (erp, 5*HZ);
1971                         break;
1972
1973                 default:
1974                         /* should not happen - continue */
1975                         break;
1976                 }
1977         }
1978
1979         erp->function = dasd_3990_erp_compound_code;
1980
1981         return erp;
1982
1983 }                               /* end dasd_3990_erp_compound_code */
1984
1985 /*
1986  * DASD_3990_ERP_COMPOUND_CONFIG
1987  *
1988  * DESCRIPTION
1989  *   Handles the compound ERP action for configruation
1990  *   dependent error.
1991  *   Note: duplex handling is not implemented (yet).
1992  *
1993  * PARAMETER
1994  *   sense              sense data of the actual error
1995  *   erp                pointer to the currently created ERP
1996  *
1997  * RETURN VALUES
1998  *   erp                modified ERP pointer
1999  *
2000  */
2001 static void
2002 dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense)
2003 {
2004
2005         if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) {
2006
2007                 /* set to suspended duplex state then restart
2008                    internal error 05 - Set device to suspended duplex state
2009                    should be done */
2010                 struct dasd_device *device = erp->startdev;
2011                 dev_err(&device->cdev->dev,
2012                         "An error occurred in the DASD device driver, "
2013                         "reason=%s\n", "05");
2014
2015         }
2016
2017         erp->function = dasd_3990_erp_compound_config;
2018
2019 }                               /* end dasd_3990_erp_compound_config */
2020
2021 /*
2022  * DASD_3990_ERP_COMPOUND
2023  *
2024  * DESCRIPTION
2025  *   Does the further compound program action if
2026  *   compound retry was not successful.
2027  *
2028  * PARAMETER
2029  *   sense              sense data of the actual error
2030  *   erp                pointer to the current (failed) ERP
2031  *
2032  * RETURN VALUES
2033  *   erp                (additional) ERP pointer
2034  *
2035  */
2036 static struct dasd_ccw_req *
2037 dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense)
2038 {
2039
2040         if ((erp->function == dasd_3990_erp_compound_retry) &&
2041             (erp->status == DASD_CQR_NEED_ERP)) {
2042
2043                 dasd_3990_erp_compound_path(erp, sense);
2044         }
2045
2046         if ((erp->function == dasd_3990_erp_compound_path) &&
2047             (erp->status == DASD_CQR_NEED_ERP)) {
2048
2049                 erp = dasd_3990_erp_compound_code(erp, sense);
2050         }
2051
2052         if ((erp->function == dasd_3990_erp_compound_code) &&
2053             (erp->status == DASD_CQR_NEED_ERP)) {
2054
2055                 dasd_3990_erp_compound_config(erp, sense);
2056         }
2057
2058         /* if no compound action ERP specified, the request failed */
2059         if (erp->status == DASD_CQR_NEED_ERP)
2060                 erp->status = DASD_CQR_FAILED;
2061
2062         return erp;
2063
2064 }                               /* end dasd_3990_erp_compound */
2065
2066 /*
2067  *DASD_3990_ERP_HANDLE_SIM
2068  *
2069  *DESCRIPTION
2070  *  inspects the SIM SENSE data and starts an appropriate action
2071  *
2072  * PARAMETER
2073  *   sense         sense data of the actual error
2074  *
2075  * RETURN VALUES
2076  *   none
2077  */
2078 void
2079 dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense)
2080 {
2081         /* print message according to log or message to operator mode */
2082         if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) {
2083                 /* print SIM SRC from RefCode */
2084                 dev_err(&device->cdev->dev, "SIM - SRC: "
2085                             "%02x%02x%02x%02x\n", sense[22],
2086                             sense[23], sense[11], sense[12]);
2087         } else if (sense[24] & DASD_SIM_LOG) {
2088                 /* print SIM SRC Refcode */
2089                 dev_warn(&device->cdev->dev, "log SIM - SRC: "
2090                             "%02x%02x%02x%02x\n", sense[22],
2091                             sense[23], sense[11], sense[12]);
2092         }
2093 }
2094
2095 /*
2096  * DASD_3990_ERP_INSPECT_32
2097  *
2098  * DESCRIPTION
2099  *   Does a detailed inspection of the 32 byte sense data
2100  *   and sets up a related error recovery action.
2101  *
2102  * PARAMETER
2103  *   sense              sense data of the actual error
2104  *   erp                pointer to the currently created default ERP
2105  *
2106  * RETURN VALUES
2107  *   erp_filled         pointer to the ERP
2108  *
2109  */
2110 static struct dasd_ccw_req *
2111 dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
2112 {
2113
2114         struct dasd_device *device = erp->startdev;
2115
2116         erp->function = dasd_3990_erp_inspect_32;
2117
2118         /* check for SIM sense data */
2119         if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)
2120                 dasd_3990_erp_handle_sim(device, sense);
2121
2122         if (sense[25] & DASD_SENSE_BIT_0) {
2123
2124                 /* compound program action codes (byte25 bit 0 == '1') */
2125                 dasd_3990_erp_compound_retry(erp, sense);
2126
2127         } else {
2128
2129                 /* single program action codes (byte25 bit 0 == '0') */
2130                 switch (sense[25]) {
2131
2132                 case 0x00:      /* success - use default ERP for retries */
2133                         DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
2134                                     "ERP called for successful request"
2135                                     " - just retry");
2136                         break;
2137
2138                 case 0x01:      /* fatal error */
2139                         dev_err(&device->cdev->dev,
2140                                     "ERP failed for the DASD\n");
2141
2142                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2143                         break;
2144
2145                 case 0x02:      /* intervention required */
2146                 case 0x03:      /* intervention required during dual copy */
2147                         erp = dasd_3990_erp_int_req(erp);
2148                         break;
2149
2150                 case 0x0F:  /* length mismatch during update write command
2151                                internal error 08 - update write command error*/
2152                         dev_err(&device->cdev->dev, "An error occurred in the "
2153                                 "DASD device driver, reason=%s\n", "08");
2154
2155                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2156                         break;
2157
2158                 case 0x10:  /* logging required for other channel program */
2159                         erp = dasd_3990_erp_action_10_32(erp, sense);
2160                         break;
2161
2162                 case 0x15:      /* next track outside defined extend
2163                                    internal error 07 - The next track is not
2164                                    within the defined storage extent */
2165                         dev_err(&device->cdev->dev,
2166                                 "An error occurred in the DASD device driver, "
2167                                 "reason=%s\n", "07");
2168
2169                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2170                         break;
2171
2172                 case 0x1B:      /* unexpected condition during write */
2173
2174                         erp = dasd_3990_erp_action_1B_32(erp, sense);
2175                         break;
2176
2177                 case 0x1C:      /* invalid data */
2178                         dev_emerg(&device->cdev->dev,
2179                                     "Data recovered during retry with PCI "
2180                                     "fetch mode active\n");
2181
2182                         /* not possible to handle this situation in Linux */
2183                         panic
2184                             ("Invalid data - No way to inform application "
2185                              "about the possibly incorrect data");
2186                         break;
2187
2188                 case 0x1D:      /* state-change pending */
2189                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2190                                     "A State change pending condition exists "
2191                                     "for the subsystem or device");
2192
2193                         erp = dasd_3990_erp_action_4(erp, sense);
2194                         break;
2195
2196                 case 0x1E:      /* busy */
2197                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2198                                     "Busy condition exists "
2199                                     "for the subsystem or device");
2200                         erp = dasd_3990_erp_action_4(erp, sense);
2201                         break;
2202
2203                 default:        /* all others errors - default erp  */
2204                         break;
2205                 }
2206         }
2207
2208         return erp;
2209
2210 }                               /* end dasd_3990_erp_inspect_32 */
2211
2212 static void dasd_3990_erp_disable_path(struct dasd_device *device, __u8 lpum)
2213 {
2214         int pos = pathmask_to_pos(lpum);
2215
2216         /* no remaining path, cannot disable */
2217         if (!(dasd_path_get_opm(device) & ~lpum))
2218                 return;
2219
2220         dev_err(&device->cdev->dev,
2221                 "Path %x.%02x (pathmask %02x) is disabled - IFCC threshold exceeded\n",
2222                 device->path[pos].cssid, device->path[pos].chpid, lpum);
2223         dasd_path_remove_opm(device, lpum);
2224         dasd_path_add_ifccpm(device, lpum);
2225         device->path[pos].errorclk = 0;
2226         atomic_set(&device->path[pos].error_count, 0);
2227 }
2228
2229 static void dasd_3990_erp_account_error(struct dasd_ccw_req *erp)
2230 {
2231         struct dasd_device *device = erp->startdev;
2232         __u8 lpum = erp->refers->irb.esw.esw1.lpum;
2233         int pos = pathmask_to_pos(lpum);
2234         unsigned long clk;
2235
2236         if (!device->path_thrhld)
2237                 return;
2238
2239         clk = get_tod_clock();
2240         /*
2241          * check if the last error is longer ago than the timeout,
2242          * if so reset error state
2243          */
2244         if ((tod_to_ns(clk - device->path[pos].errorclk) / NSEC_PER_SEC)
2245             >= device->path_interval) {
2246                 atomic_set(&device->path[pos].error_count, 0);
2247                 device->path[pos].errorclk = 0;
2248         }
2249         atomic_inc(&device->path[pos].error_count);
2250         device->path[pos].errorclk = clk;
2251         /* threshold exceeded disable path if possible */
2252         if (atomic_read(&device->path[pos].error_count) >=
2253             device->path_thrhld)
2254                 dasd_3990_erp_disable_path(device, lpum);
2255 }
2256
2257 /*
2258  *****************************************************************************
2259  * main ERP control functions (24 and 32 byte sense)
2260  *****************************************************************************
2261  */
2262
2263 /*
2264  * DASD_3990_ERP_CONTROL_CHECK
2265  *
2266  * DESCRIPTION
2267  *   Does a generic inspection if a control check occurred and sets up
2268  *   the related error recovery procedure
2269  *
2270  * PARAMETER
2271  *   erp                pointer to the currently created default ERP
2272  *
2273  * RETURN VALUES
2274  *   erp_filled         pointer to the erp
2275  */
2276
2277 static struct dasd_ccw_req *
2278 dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
2279 {
2280         struct dasd_device *device = erp->startdev;
2281
2282         if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK
2283                                            | SCHN_STAT_CHN_CTRL_CHK)) {
2284                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2285                             "channel or interface control check");
2286                 dasd_3990_erp_account_error(erp);
2287                 erp = dasd_3990_erp_action_4(erp, NULL);
2288         }
2289         return erp;
2290 }
2291
2292 /*
2293  * DASD_3990_ERP_INSPECT
2294  *
2295  * DESCRIPTION
2296  *   Does a detailed inspection for sense data by calling either
2297  *   the 24-byte or the 32-byte inspection routine.
2298  *
2299  * PARAMETER
2300  *   erp                pointer to the currently created default ERP
2301  * RETURN VALUES
2302  *   erp_new            contens was possibly modified
2303  */
2304 static struct dasd_ccw_req *
2305 dasd_3990_erp_inspect(struct dasd_ccw_req *erp)
2306 {
2307
2308         struct dasd_ccw_req *erp_new = NULL;
2309         char *sense;
2310
2311         /* if this problem occurred on an alias retry on base */
2312         erp_new = dasd_3990_erp_inspect_alias(erp);
2313         if (erp_new)
2314                 return erp_new;
2315
2316         /* sense data are located in the refers record of the
2317          * already set up new ERP !
2318          * check if concurrent sens is available
2319          */
2320         sense = dasd_get_sense(&erp->refers->irb);
2321         if (!sense)
2322                 erp_new = dasd_3990_erp_control_check(erp);
2323         /* distinguish between 24 and 32 byte sense data */
2324         else if (sense[27] & DASD_SENSE_BIT_0) {
2325
2326                 /* inspect the 24 byte sense data */
2327                 erp_new = dasd_3990_erp_inspect_24(erp, sense);
2328
2329         } else {
2330
2331                 /* inspect the 32 byte sense data */
2332                 erp_new = dasd_3990_erp_inspect_32(erp, sense);
2333
2334         }       /* end distinguish between 24 and 32 byte sense data */
2335
2336         return erp_new;
2337 }
2338
2339 /*
2340  * DASD_3990_ERP_ADD_ERP
2341  *
2342  * DESCRIPTION
2343  *   This function adds an additional request block (ERP) to the head of
2344  *   the given cqr (or erp).
2345  *   For a command mode cqr the erp is initialized as an default erp
2346  *   (retry TIC).
2347  *   For transport mode we make a copy of the original TCW (points to
2348  *   the original TCCB, TIDALs, etc.) but give it a fresh
2349  *   TSB so the original sense data will not be changed.
2350  *
2351  * PARAMETER
2352  *   cqr                head of the current ERP-chain (or single cqr if
2353  *                      first error)
2354  * RETURN VALUES
2355  *   erp                pointer to new ERP-chain head
2356  */
2357 static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr)
2358 {
2359
2360         struct dasd_device *device = cqr->startdev;
2361         struct ccw1 *ccw;
2362         struct dasd_ccw_req *erp;
2363         int cplength, datasize;
2364         struct tcw *tcw;
2365         struct tsb *tsb;
2366
2367         if (cqr->cpmode == 1) {
2368                 cplength = 0;
2369                 /* TCW needs to be 64 byte aligned, so leave enough room */
2370                 datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb);
2371         } else {
2372                 cplength = 2;
2373                 datasize = 0;
2374         }
2375
2376         /* allocate additional request block */
2377         erp = dasd_alloc_erp_request((char *) &cqr->magic,
2378                                      cplength, datasize, device);
2379         if (IS_ERR(erp)) {
2380                 if (cqr->retries <= 0) {
2381                         DBF_DEV_EVENT(DBF_ERR, device, "%s",
2382                                     "Unable to allocate ERP request");
2383                         cqr->status = DASD_CQR_FAILED;
2384                         cqr->stopclk = get_tod_clock();
2385                 } else {
2386                         DBF_DEV_EVENT(DBF_ERR, device,
2387                                      "Unable to allocate ERP request "
2388                                      "(%i retries left)",
2389                                      cqr->retries);
2390                         dasd_block_set_timer(device->block, (HZ << 3));
2391                 }
2392                 return erp;
2393         }
2394
2395         ccw = cqr->cpaddr;
2396         if (cqr->cpmode == 1) {
2397                 /* make a shallow copy of the original tcw but set new tsb */
2398                 erp->cpmode = 1;
2399                 erp->cpaddr = PTR_ALIGN(erp->data, 64);
2400                 tcw = erp->cpaddr;
2401                 tsb = (struct tsb *) &tcw[1];
2402                 *tcw = *((struct tcw *)cqr->cpaddr);
2403                 tcw->tsb = (long)tsb;
2404         } else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) {
2405                 /* PSF cannot be chained from NOOP/TIC */
2406                 erp->cpaddr = cqr->cpaddr;
2407         } else {
2408                 /* initialize request with default TIC to current ERP/CQR */
2409                 ccw = erp->cpaddr;
2410                 ccw->cmd_code = CCW_CMD_NOOP;
2411                 ccw->flags = CCW_FLAG_CC;
2412                 ccw++;
2413                 ccw->cmd_code = CCW_CMD_TIC;
2414                 ccw->cda      = (long)(cqr->cpaddr);
2415         }
2416
2417         erp->flags = cqr->flags;
2418         erp->function = dasd_3990_erp_add_erp;
2419         erp->refers   = cqr;
2420         erp->startdev = device;
2421         erp->memdev   = device;
2422         erp->block    = cqr->block;
2423         erp->magic    = cqr->magic;
2424         erp->expires  = cqr->expires;
2425         erp->retries  = 256;
2426         erp->buildclk = get_tod_clock();
2427         erp->status = DASD_CQR_FILLED;
2428
2429         return erp;
2430 }
2431
2432 /*
2433  * DASD_3990_ERP_ADDITIONAL_ERP
2434  *
2435  * DESCRIPTION
2436  *   An additional ERP is needed to handle the current error.
2437  *   Add ERP to the head of the ERP-chain containing the ERP processing
2438  *   determined based on the sense data.
2439  *
2440  * PARAMETER
2441  *   cqr                head of the current ERP-chain (or single cqr if
2442  *                      first error)
2443  *
2444  * RETURN VALUES
2445  *   erp                pointer to new ERP-chain head
2446  */
2447 static struct dasd_ccw_req *
2448 dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr)
2449 {
2450
2451         struct dasd_ccw_req *erp = NULL;
2452
2453         /* add erp and initialize with default TIC */
2454         erp = dasd_3990_erp_add_erp(cqr);
2455
2456         if (IS_ERR(erp))
2457                 return erp;
2458
2459         /* inspect sense, determine specific ERP if possible */
2460         if (erp != cqr) {
2461
2462                 erp = dasd_3990_erp_inspect(erp);
2463         }
2464
2465         return erp;
2466
2467 }                               /* end dasd_3990_erp_additional_erp */
2468
2469 /*
2470  * DASD_3990_ERP_ERROR_MATCH
2471  *
2472  * DESCRIPTION
2473  *   Check if the device status of the given cqr is the same.
2474  *   This means that the failed CCW and the relevant sense data
2475  *   must match.
2476  *   I don't distinguish between 24 and 32 byte sense because in case of
2477  *   24 byte sense byte 25 and 27 is set as well.
2478  *
2479  * PARAMETER
2480  *   cqr1               first cqr, which will be compared with the
2481  *   cqr2               second cqr.
2482  *
2483  * RETURN VALUES
2484  *   match              'boolean' for match found
2485  *                      returns 1 if match found, otherwise 0.
2486  */
2487 static int dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1,
2488                                      struct dasd_ccw_req *cqr2)
2489 {
2490         char *sense1, *sense2;
2491
2492         if (cqr1->startdev != cqr2->startdev)
2493                 return 0;
2494
2495         sense1 = dasd_get_sense(&cqr1->irb);
2496         sense2 = dasd_get_sense(&cqr2->irb);
2497
2498         /* one request has sense data, the other not -> no match, return 0 */
2499         if (!sense1 != !sense2)
2500                 return 0;
2501         /* no sense data in both cases -> check cstat for IFCC */
2502         if (!sense1 && !sense2) {
2503                 if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2504                                                     SCHN_STAT_CHN_CTRL_CHK)) ==
2505                     (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2506                                                     SCHN_STAT_CHN_CTRL_CHK)))
2507                         return 1; /* match with ifcc*/
2508         }
2509         /* check sense data; byte 0-2,25,27 */
2510         if (!(sense1 && sense2 &&
2511               (memcmp(sense1, sense2, 3) == 0) &&
2512               (sense1[27] == sense2[27]) &&
2513               (sense1[25] == sense2[25]))) {
2514
2515                 return 0;       /* sense doesn't match */
2516         }
2517
2518         return 1;               /* match */
2519
2520 }                               /* end dasd_3990_erp_error_match */
2521
2522 /*
2523  * DASD_3990_ERP_IN_ERP
2524  *
2525  * DESCRIPTION
2526  *   check if the current error already happened before.
2527  *   quick exit if current cqr is not an ERP (cqr->refers=NULL)
2528  *
2529  * PARAMETER
2530  *   cqr                failed cqr (either original cqr or already an erp)
2531  *
2532  * RETURN VALUES
2533  *   erp                erp-pointer to the already defined error
2534  *                      recovery procedure OR
2535  *                      NULL if a 'new' error occurred.
2536  */
2537 static struct dasd_ccw_req *
2538 dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr)
2539 {
2540
2541         struct dasd_ccw_req *erp_head = cqr,    /* save erp chain head */
2542         *erp_match = NULL;      /* save erp chain head */
2543         int match = 0;          /* 'boolean' for matching error found */
2544
2545         if (cqr->refers == NULL) {      /* return if not in erp */
2546                 return NULL;
2547         }
2548
2549         /* check the erp/cqr chain for current error */
2550         do {
2551                 match = dasd_3990_erp_error_match(erp_head, cqr->refers);
2552                 erp_match = cqr;        /* save possible matching erp  */
2553                 cqr = cqr->refers;      /* check next erp/cqr in queue */
2554
2555         } while ((cqr->refers != NULL) && (!match));
2556
2557         if (!match) {
2558                 return NULL;    /* no match was found */
2559         }
2560
2561         return erp_match;       /* return address of matching erp */
2562
2563 }                               /* END dasd_3990_erp_in_erp */
2564
2565 /*
2566  * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
2567  *
2568  * DESCRIPTION
2569  *   No retry is left for the current ERP. Check what has to be done
2570  *   with the ERP.
2571  *     - do further defined ERP action or
2572  *     - wait for interrupt or
2573  *     - exit with permanent error
2574  *
2575  * PARAMETER
2576  *   erp                ERP which is in progress with no retry left
2577  *
2578  * RETURN VALUES
2579  *   erp                modified/additional ERP
2580  */
2581 static struct dasd_ccw_req *
2582 dasd_3990_erp_further_erp(struct dasd_ccw_req *erp)
2583 {
2584
2585         struct dasd_device *device = erp->startdev;
2586         char *sense = dasd_get_sense(&erp->irb);
2587
2588         /* check for 24 byte sense ERP */
2589         if ((erp->function == dasd_3990_erp_bus_out) ||
2590             (erp->function == dasd_3990_erp_action_1) ||
2591             (erp->function == dasd_3990_erp_action_4)) {
2592
2593                 erp = dasd_3990_erp_action_1(erp);
2594
2595         } else if (erp->function == dasd_3990_erp_action_1_sec) {
2596                 erp = dasd_3990_erp_action_1_sec(erp);
2597         } else if (erp->function == dasd_3990_erp_action_5) {
2598
2599                 /* retries have not been successful */
2600                 /* prepare erp for retry on different channel path */
2601                 erp = dasd_3990_erp_action_1(erp);
2602
2603                 if (sense && !(sense[2] & DASD_SENSE_BIT_0)) {
2604
2605                         /* issue a Diagnostic Control command with an
2606                          * Inhibit Write subcommand */
2607
2608                         switch (sense[25]) {
2609                         case 0x17:
2610                         case 0x57:{     /* controller */
2611                                         erp = dasd_3990_erp_DCTL(erp, 0x20);
2612                                         break;
2613                                 }
2614                         case 0x18:
2615                         case 0x58:{     /* channel path */
2616                                         erp = dasd_3990_erp_DCTL(erp, 0x40);
2617                                         break;
2618                                 }
2619                         case 0x19:
2620                         case 0x59:{     /* storage director */
2621                                         erp = dasd_3990_erp_DCTL(erp, 0x80);
2622                                         break;
2623                                 }
2624                         default:
2625                                 DBF_DEV_EVENT(DBF_WARNING, device,
2626                                             "invalid subcommand modifier 0x%x "
2627                                             "for Diagnostic Control Command",
2628                                             sense[25]);
2629                         }
2630                 }
2631
2632                 /* check for 32 byte sense ERP */
2633         } else if (sense &&
2634                    ((erp->function == dasd_3990_erp_compound_retry) ||
2635                     (erp->function == dasd_3990_erp_compound_path) ||
2636                     (erp->function == dasd_3990_erp_compound_code) ||
2637                     (erp->function == dasd_3990_erp_compound_config))) {
2638
2639                 erp = dasd_3990_erp_compound(erp, sense);
2640
2641         } else {
2642                 /*
2643                  * No retry left and no additional special handling
2644                  * necessary
2645                  */
2646                 dev_err(&device->cdev->dev,
2647                         "ERP %p has run out of retries and failed\n", erp);
2648
2649                 erp->status = DASD_CQR_FAILED;
2650         }
2651
2652         return erp;
2653
2654 }                               /* end dasd_3990_erp_further_erp */
2655
2656 /*
2657  * DASD_3990_ERP_HANDLE_MATCH_ERP
2658  *
2659  * DESCRIPTION
2660  *   An error occurred again and an ERP has been detected which is already
2661  *   used to handle this error (e.g. retries).
2662  *   All prior ERP's are asumed to be successful and therefore removed
2663  *   from queue.
2664  *   If retry counter of matching erp is already 0, it is checked if further
2665  *   action is needed (besides retry) or if the ERP has failed.
2666  *
2667  * PARAMETER
2668  *   erp_head           first ERP in ERP-chain
2669  *   erp                ERP that handles the actual error.
2670  *                      (matching erp)
2671  *
2672  * RETURN VALUES
2673  *   erp                modified/additional ERP
2674  */
2675 static struct dasd_ccw_req *
2676 dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head,
2677                                struct dasd_ccw_req *erp)
2678 {
2679
2680         struct dasd_device *device = erp_head->startdev;
2681         struct dasd_ccw_req *erp_done = erp_head;       /* finished req */
2682         struct dasd_ccw_req *erp_free = NULL;   /* req to be freed */
2683
2684         /* loop over successful ERPs and remove them from chanq */
2685         while (erp_done != erp) {
2686
2687                 if (erp_done == NULL)   /* end of chain reached */
2688                         panic(PRINTK_HEADER "Programming error in ERP! The "
2689                               "original request was lost\n");
2690
2691                 /* remove the request from the device queue */
2692                 list_del(&erp_done->blocklist);
2693
2694                 erp_free = erp_done;
2695                 erp_done = erp_done->refers;
2696
2697                 /* free the finished erp request */
2698                 dasd_free_erp_request(erp_free, erp_free->memdev);
2699
2700         }                       /* end while */
2701
2702         if (erp->retries > 0) {
2703
2704                 char *sense = dasd_get_sense(&erp->refers->irb);
2705
2706                 /* check for special retries */
2707                 if (sense && erp->function == dasd_3990_erp_action_4) {
2708
2709                         erp = dasd_3990_erp_action_4(erp, sense);
2710
2711                 } else if (sense &&
2712                            erp->function == dasd_3990_erp_action_1B_32) {
2713
2714                         erp = dasd_3990_update_1B(erp, sense);
2715
2716                 } else if (sense && erp->function == dasd_3990_erp_int_req) {
2717
2718                         erp = dasd_3990_erp_int_req(erp);
2719
2720                 } else {
2721                         /* simple retry   */
2722                         DBF_DEV_EVENT(DBF_DEBUG, device,
2723                                     "%i retries left for erp %p",
2724                                     erp->retries, erp);
2725
2726                         /* handle the request again... */
2727                         erp->status = DASD_CQR_FILLED;
2728                 }
2729
2730         } else {
2731                 /* no retry left - check for further necessary action    */
2732                 /* if no further actions, handle rest as permanent error */
2733                 erp = dasd_3990_erp_further_erp(erp);
2734         }
2735
2736         return erp;
2737
2738 }                               /* end dasd_3990_erp_handle_match_erp */
2739
2740 /*
2741  * DASD_3990_ERP_ACTION
2742  *
2743  * DESCRIPTION
2744  *   control routine for 3990 erp actions.
2745  *   Has to be called with the queue lock (namely the s390_irq_lock) acquired.
2746  *
2747  * PARAMETER
2748  *   cqr                failed cqr (either original cqr or already an erp)
2749  *
2750  * RETURN VALUES
2751  *   erp                erp-pointer to the head of the ERP action chain.
2752  *                      This means:
2753  *                       - either a ptr to an additional ERP cqr or
2754  *                       - the original given cqr (which's status might
2755  *                         be modified)
2756  */
2757 struct dasd_ccw_req *
2758 dasd_3990_erp_action(struct dasd_ccw_req * cqr)
2759 {
2760         struct dasd_ccw_req *erp = NULL;
2761         struct dasd_device *device = cqr->startdev;
2762         struct dasd_ccw_req *temp_erp = NULL;
2763
2764         if (device->features & DASD_FEATURE_ERPLOG) {
2765                 /* print current erp_chain */
2766                 dev_err(&device->cdev->dev,
2767                             "ERP chain at BEGINNING of ERP-ACTION\n");
2768                 for (temp_erp = cqr;
2769                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2770
2771                         dev_err(&device->cdev->dev,
2772                                     "ERP %p (%02x) refers to %p\n",
2773                                     temp_erp, temp_erp->status,
2774                                     temp_erp->refers);
2775                 }
2776         }
2777
2778         /* double-check if current erp/cqr was successful */
2779         if ((scsw_cstat(&cqr->irb.scsw) == 0x00) &&
2780             (scsw_dstat(&cqr->irb.scsw) ==
2781              (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
2782
2783                 DBF_DEV_EVENT(DBF_DEBUG, device,
2784                             "ERP called for successful request %p"
2785                             " - NO ERP necessary", cqr);
2786
2787                 cqr->status = DASD_CQR_DONE;
2788
2789                 return cqr;
2790         }
2791
2792         /* check if error happened before */
2793         erp = dasd_3990_erp_in_erp(cqr);
2794
2795         if (erp == NULL) {
2796                 /* no matching erp found - set up erp */
2797                 erp = dasd_3990_erp_additional_erp(cqr);
2798                 if (IS_ERR(erp))
2799                         return erp;
2800         } else {
2801                 /* matching erp found - set all leading erp's to DONE */
2802                 erp = dasd_3990_erp_handle_match_erp(cqr, erp);
2803         }
2804
2805         if (device->features & DASD_FEATURE_ERPLOG) {
2806                 /* print current erp_chain */
2807                 dev_err(&device->cdev->dev,
2808                             "ERP chain at END of ERP-ACTION\n");
2809                 for (temp_erp = erp;
2810                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2811
2812                         dev_err(&device->cdev->dev,
2813                                     "ERP %p (%02x) refers to %p\n",
2814                                     temp_erp, temp_erp->status,
2815                                     temp_erp->refers);
2816                 }
2817         }
2818
2819         /* enqueue ERP request if it's a new one */
2820         if (list_empty(&erp->blocklist)) {
2821                 cqr->status = DASD_CQR_IN_ERP;
2822                 /* add erp request before the cqr */
2823                 list_add_tail(&erp->blocklist, &cqr->blocklist);
2824         }
2825
2826
2827
2828         return erp;
2829
2830 }                               /* end dasd_3990_erp_action */