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[S390] dasd: let recovery cqr inherit flags from failed cqr
[~shefty/rdma-dev.git] / drivers / s390 / block / dasd_3990_erp.c
1 /*
2  * File...........: linux/drivers/s390/block/dasd_3990_erp.c
3  * Author(s)......: Horst  Hummel    <Horst.Hummel@de.ibm.com>
4  *                  Holger Smolinski <Holger.Smolinski@de.ibm.com>
5  * Bugreports.to..: <Linux390@de.ibm.com>
6  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000, 2001
7  *
8  */
9
10 #define KMSG_COMPONENT "dasd-eckd"
11
12 #include <linux/timer.h>
13 #include <asm/idals.h>
14
15 #define PRINTK_HEADER "dasd_erp(3990): "
16
17 #include "dasd_int.h"
18 #include "dasd_eckd.h"
19
20
21 struct DCTL_data {
22         unsigned char subcommand;  /* e.g Inhibit Write, Enable Write,... */
23         unsigned char modifier;    /* Subcommand modifier */
24         unsigned short res;        /* reserved */
25 } __attribute__ ((packed));
26
27 /*
28  *****************************************************************************
29  * SECTION ERP HANDLING
30  *****************************************************************************
31  */
32 /*
33  *****************************************************************************
34  * 24 and 32 byte sense ERP functions
35  *****************************************************************************
36  */
37
38 /*
39  * DASD_3990_ERP_CLEANUP
40  *
41  * DESCRIPTION
42  *   Removes the already build but not necessary ERP request and sets
43  *   the status of the original cqr / erp to the given (final) status
44  *
45  *  PARAMETER
46  *   erp                request to be blocked
47  *   final_status       either DASD_CQR_DONE or DASD_CQR_FAILED
48  *
49  * RETURN VALUES
50  *   cqr                original cqr
51  */
52 static struct dasd_ccw_req *
53 dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status)
54 {
55         struct dasd_ccw_req *cqr = erp->refers;
56
57         dasd_free_erp_request(erp, erp->memdev);
58         cqr->status = final_status;
59         return cqr;
60
61 }                               /* end dasd_3990_erp_cleanup */
62
63 /*
64  * DASD_3990_ERP_BLOCK_QUEUE
65  *
66  * DESCRIPTION
67  *   Block the given device request queue to prevent from further
68  *   processing until the started timer has expired or an related
69  *   interrupt was received.
70  */
71 static void dasd_3990_erp_block_queue(struct dasd_ccw_req *erp, int expires)
72 {
73
74         struct dasd_device *device = erp->startdev;
75         unsigned long flags;
76
77         DBF_DEV_EVENT(DBF_INFO, device,
78                     "blocking request queue for %is", expires/HZ);
79
80         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
81         dasd_device_set_stop_bits(device, DASD_STOPPED_PENDING);
82         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
83         erp->status = DASD_CQR_FILLED;
84         if (erp->block)
85                 dasd_block_set_timer(erp->block, expires);
86         else
87                 dasd_device_set_timer(device, expires);
88 }
89
90 /*
91  * DASD_3990_ERP_INT_REQ
92  *
93  * DESCRIPTION
94  *   Handles 'Intervention Required' error.
95  *   This means either device offline or not installed.
96  *
97  * PARAMETER
98  *   erp                current erp
99  * RETURN VALUES
100  *   erp                modified erp
101  */
102 static struct dasd_ccw_req *
103 dasd_3990_erp_int_req(struct dasd_ccw_req * erp)
104 {
105
106         struct dasd_device *device = erp->startdev;
107
108         /* first time set initial retry counter and erp_function */
109         /* and retry once without blocking queue                 */
110         /* (this enables easier enqueing of the cqr)             */
111         if (erp->function != dasd_3990_erp_int_req) {
112
113                 erp->retries = 256;
114                 erp->function = dasd_3990_erp_int_req;
115
116         } else {
117
118                 /* issue a message and wait for 'device ready' interrupt */
119                 dev_err(&device->cdev->dev,
120                             "is offline or not installed - "
121                             "INTERVENTION REQUIRED!!\n");
122
123                 dasd_3990_erp_block_queue(erp, 60*HZ);
124         }
125
126         return erp;
127
128 }                               /* end dasd_3990_erp_int_req */
129
130 /*
131  * DASD_3990_ERP_ALTERNATE_PATH
132  *
133  * DESCRIPTION
134  *   Repeat the operation on a different channel path.
135  *   If all alternate paths have been tried, the request is posted with a
136  *   permanent error.
137  *
138  *  PARAMETER
139  *   erp                pointer to the current ERP
140  *
141  * RETURN VALUES
142  *   erp                modified pointer to the ERP
143  */
144 static void
145 dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
146 {
147         struct dasd_device *device = erp->startdev;
148         __u8 opm;
149         unsigned long flags;
150
151         /* try alternate valid path */
152         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
153         opm = ccw_device_get_path_mask(device->cdev);
154         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
155         //FIXME: start with get_opm ?
156         if (erp->lpm == 0)
157                 erp->lpm = LPM_ANYPATH & ~(erp->irb.esw.esw0.sublog.lpum);
158         else
159                 erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
160
161         if ((erp->lpm & opm) != 0x00) {
162
163                 DBF_DEV_EVENT(DBF_WARNING, device,
164                             "try alternate lpm=%x (lpum=%x / opm=%x)",
165                             erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm);
166
167                 /* reset status to submit the request again... */
168                 erp->status = DASD_CQR_FILLED;
169                 erp->retries = 10;
170         } else {
171                 dev_err(&device->cdev->dev,
172                         "The DASD cannot be reached on any path (lpum=%x"
173                         "/opm=%x)\n", erp->irb.esw.esw0.sublog.lpum, opm);
174
175                 /* post request with permanent error */
176                 erp->status = DASD_CQR_FAILED;
177         }
178 }                               /* end dasd_3990_erp_alternate_path */
179
180 /*
181  * DASD_3990_ERP_DCTL
182  *
183  * DESCRIPTION
184  *   Setup cqr to do the Diagnostic Control (DCTL) command with an
185  *   Inhibit Write subcommand (0x20) and the given modifier.
186  *
187  *  PARAMETER
188  *   erp                pointer to the current (failed) ERP
189  *   modifier           subcommand modifier
190  *
191  * RETURN VALUES
192  *   dctl_cqr           pointer to NEW dctl_cqr
193  *
194  */
195 static struct dasd_ccw_req *
196 dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier)
197 {
198
199         struct dasd_device *device = erp->startdev;
200         struct DCTL_data *DCTL_data;
201         struct ccw1 *ccw;
202         struct dasd_ccw_req *dctl_cqr;
203
204         dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1,
205                                           sizeof(struct DCTL_data),
206                                           device);
207         if (IS_ERR(dctl_cqr)) {
208                 dev_err(&device->cdev->dev,
209                             "Unable to allocate DCTL-CQR\n");
210                 erp->status = DASD_CQR_FAILED;
211                 return erp;
212         }
213
214         DCTL_data = dctl_cqr->data;
215
216         DCTL_data->subcommand = 0x02;   /* Inhibit Write */
217         DCTL_data->modifier = modifier;
218
219         ccw = dctl_cqr->cpaddr;
220         memset(ccw, 0, sizeof(struct ccw1));
221         ccw->cmd_code = CCW_CMD_DCTL;
222         ccw->count = 4;
223         ccw->cda = (__u32)(addr_t) DCTL_data;
224         dctl_cqr->flags = erp->flags;
225         dctl_cqr->function = dasd_3990_erp_DCTL;
226         dctl_cqr->refers = erp;
227         dctl_cqr->startdev = device;
228         dctl_cqr->memdev = device;
229         dctl_cqr->magic = erp->magic;
230         dctl_cqr->expires = 5 * 60 * HZ;
231         dctl_cqr->retries = 2;
232
233         dctl_cqr->buildclk = get_clock();
234
235         dctl_cqr->status = DASD_CQR_FILLED;
236
237         return dctl_cqr;
238
239 }                               /* end dasd_3990_erp_DCTL */
240
241 /*
242  * DASD_3990_ERP_ACTION_1
243  *
244  * DESCRIPTION
245  *   Setup ERP to do the ERP action 1 (see Reference manual).
246  *   Repeat the operation on a different channel path.
247  *   As deviation from the recommended recovery action, we reset the path mask
248  *   after we have tried each path and go through all paths a second time.
249  *   This will cover situations where only one path at a time is actually down,
250  *   but all paths fail and recover just with the same sequence and timing as
251  *   we try to use them (flapping links).
252  *   If all alternate paths have been tried twice, the request is posted with
253  *   a permanent error.
254  *
255  *  PARAMETER
256  *   erp                pointer to the current ERP
257  *
258  * RETURN VALUES
259  *   erp                pointer to the ERP
260  *
261  */
262 static struct dasd_ccw_req *dasd_3990_erp_action_1_sec(struct dasd_ccw_req *erp)
263 {
264         erp->function = dasd_3990_erp_action_1_sec;
265         dasd_3990_erp_alternate_path(erp);
266         return erp;
267 }
268
269 static struct dasd_ccw_req *dasd_3990_erp_action_1(struct dasd_ccw_req *erp)
270 {
271         erp->function = dasd_3990_erp_action_1;
272         dasd_3990_erp_alternate_path(erp);
273         if (erp->status == DASD_CQR_FAILED) {
274                 erp->status = DASD_CQR_FILLED;
275                 erp->retries = 10;
276                 erp->lpm = LPM_ANYPATH;
277                 erp->function = dasd_3990_erp_action_1_sec;
278         }
279         return erp;
280 }                               /* end dasd_3990_erp_action_1(b) */
281
282 /*
283  * DASD_3990_ERP_ACTION_4
284  *
285  * DESCRIPTION
286  *   Setup ERP to do the ERP action 4 (see Reference manual).
287  *   Set the current request to PENDING to block the CQR queue for that device
288  *   until the state change interrupt appears.
289  *   Use a timer (20 seconds) to retry the cqr if the interrupt is still
290  *   missing.
291  *
292  *  PARAMETER
293  *   sense              sense data of the actual error
294  *   erp                pointer to the current ERP
295  *
296  * RETURN VALUES
297  *   erp                pointer to the ERP
298  *
299  */
300 static struct dasd_ccw_req *
301 dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense)
302 {
303
304         struct dasd_device *device = erp->startdev;
305
306         /* first time set initial retry counter and erp_function    */
307         /* and retry once without waiting for state change pending  */
308         /* interrupt (this enables easier enqueing of the cqr)      */
309         if (erp->function != dasd_3990_erp_action_4) {
310
311                 DBF_DEV_EVENT(DBF_INFO, device, "%s",
312                             "dasd_3990_erp_action_4: first time retry");
313
314                 erp->retries = 256;
315                 erp->function = dasd_3990_erp_action_4;
316
317         } else {
318                 if (sense && (sense[25] == 0x1D)) { /* state change pending */
319
320                         DBF_DEV_EVENT(DBF_INFO, device,
321                                     "waiting for state change pending "
322                                     "interrupt, %d retries left",
323                                     erp->retries);
324
325                         dasd_3990_erp_block_queue(erp, 30*HZ);
326
327                 } else if (sense && (sense[25] == 0x1E)) {      /* busy */
328                         DBF_DEV_EVENT(DBF_INFO, device,
329                                     "busy - redriving request later, "
330                                     "%d retries left",
331                                     erp->retries);
332                         dasd_3990_erp_block_queue(erp, HZ);
333                 } else {
334                         /* no state change pending - retry */
335                         DBF_DEV_EVENT(DBF_INFO, device,
336                                      "redriving request immediately, "
337                                      "%d retries left",
338                                      erp->retries);
339                         erp->status = DASD_CQR_FILLED;
340                 }
341         }
342
343         return erp;
344
345 }                               /* end dasd_3990_erp_action_4 */
346
347 /*
348  *****************************************************************************
349  * 24 byte sense ERP functions (only)
350  *****************************************************************************
351  */
352
353 /*
354  * DASD_3990_ERP_ACTION_5
355  *
356  * DESCRIPTION
357  *   Setup ERP to do the ERP action 5 (see Reference manual).
358  *   NOTE: Further handling is done in xxx_further_erp after the retries.
359  *
360  *  PARAMETER
361  *   erp                pointer to the current ERP
362  *
363  * RETURN VALUES
364  *   erp                pointer to the ERP
365  *
366  */
367 static struct dasd_ccw_req *
368 dasd_3990_erp_action_5(struct dasd_ccw_req * erp)
369 {
370
371         /* first of all retry */
372         erp->retries = 10;
373         erp->function = dasd_3990_erp_action_5;
374
375         return erp;
376
377 }                               /* end dasd_3990_erp_action_5 */
378
379 /*
380  * DASD_3990_HANDLE_ENV_DATA
381  *
382  * DESCRIPTION
383  *   Handles 24 byte 'Environmental data present'.
384  *   Does a analysis of the sense data (message Format)
385  *   and prints the error messages.
386  *
387  * PARAMETER
388  *   sense              current sense data
389  *
390  * RETURN VALUES
391  *   void
392  */
393 static void
394 dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense)
395 {
396
397         struct dasd_device *device = erp->startdev;
398         char msg_format = (sense[7] & 0xF0);
399         char msg_no = (sense[7] & 0x0F);
400         char errorstring[ERRORLENGTH];
401
402         switch (msg_format) {
403         case 0x00:              /* Format 0 - Program or System Checks */
404
405                 if (sense[1] & 0x10) {  /* check message to operator bit */
406
407                         switch (msg_no) {
408                         case 0x00:      /* No Message */
409                                 break;
410                         case 0x01:
411                                 dev_warn(&device->cdev->dev,
412                                             "FORMAT 0 - Invalid Command\n");
413                                 break;
414                         case 0x02:
415                                 dev_warn(&device->cdev->dev,
416                                             "FORMAT 0 - Invalid Command "
417                                             "Sequence\n");
418                                 break;
419                         case 0x03:
420                                 dev_warn(&device->cdev->dev,
421                                             "FORMAT 0 - CCW Count less than "
422                                             "required\n");
423                                 break;
424                         case 0x04:
425                                 dev_warn(&device->cdev->dev,
426                                             "FORMAT 0 - Invalid Parameter\n");
427                                 break;
428                         case 0x05:
429                                 dev_warn(&device->cdev->dev,
430                                             "FORMAT 0 - Diagnostic of Special"
431                                             " Command Violates File Mask\n");
432                                 break;
433                         case 0x07:
434                                 dev_warn(&device->cdev->dev,
435                                             "FORMAT 0 - Channel Returned with "
436                                             "Incorrect retry CCW\n");
437                                 break;
438                         case 0x08:
439                                 dev_warn(&device->cdev->dev,
440                                             "FORMAT 0 - Reset Notification\n");
441                                 break;
442                         case 0x09:
443                                 dev_warn(&device->cdev->dev,
444                                          "FORMAT 0 - Storage Path Restart\n");
445                                 break;
446                         case 0x0A:
447                                 dev_warn(&device->cdev->dev,
448                                             "FORMAT 0 - Channel requested "
449                                             "... %02x\n", sense[8]);
450                                 break;
451                         case 0x0B:
452                                 dev_warn(&device->cdev->dev,
453                                             "FORMAT 0 - Invalid Defective/"
454                                             "Alternate Track Pointer\n");
455                                 break;
456                         case 0x0C:
457                                 dev_warn(&device->cdev->dev,
458                                             "FORMAT 0 - DPS Installation "
459                                             "Check\n");
460                                 break;
461                         case 0x0E:
462                                 dev_warn(&device->cdev->dev,
463                                             "FORMAT 0 - Command Invalid on "
464                                             "Secondary Address\n");
465                                 break;
466                         case 0x0F:
467                                 dev_warn(&device->cdev->dev,
468                                             "FORMAT 0 - Status Not As "
469                                             "Required: reason %02x\n",
470                                          sense[8]);
471                                 break;
472                         default:
473                                 dev_warn(&device->cdev->dev,
474                                             "FORMAT 0 - Reserved\n");
475                         }
476                 } else {
477                         switch (msg_no) {
478                         case 0x00:      /* No Message */
479                                 break;
480                         case 0x01:
481                                 dev_warn(&device->cdev->dev,
482                                          "FORMAT 0 - Device Error "
483                                          "Source\n");
484                                 break;
485                         case 0x02:
486                                 dev_warn(&device->cdev->dev,
487                                             "FORMAT 0 - Reserved\n");
488                                 break;
489                         case 0x03:
490                                 dev_warn(&device->cdev->dev,
491                                             "FORMAT 0 - Device Fenced - "
492                                             "device = %02x\n", sense[4]);
493                                 break;
494                         case 0x04:
495                                 dev_warn(&device->cdev->dev,
496                                             "FORMAT 0 - Data Pinned for "
497                                             "Device\n");
498                                 break;
499                         default:
500                                 dev_warn(&device->cdev->dev,
501                                             "FORMAT 0 - Reserved\n");
502                         }
503                 }
504                 break;
505
506         case 0x10:              /* Format 1 - Device Equipment Checks */
507                 switch (msg_no) {
508                 case 0x00:      /* No Message */
509                         break;
510                 case 0x01:
511                         dev_warn(&device->cdev->dev,
512                                     "FORMAT 1 - Device Status 1 not as "
513                                     "expected\n");
514                         break;
515                 case 0x03:
516                         dev_warn(&device->cdev->dev,
517                                     "FORMAT 1 - Index missing\n");
518                         break;
519                 case 0x04:
520                         dev_warn(&device->cdev->dev,
521                                  "FORMAT 1 - Interruption cannot be "
522                                  "reset\n");
523                         break;
524                 case 0x05:
525                         dev_warn(&device->cdev->dev,
526                                     "FORMAT 1 - Device did not respond to "
527                                     "selection\n");
528                         break;
529                 case 0x06:
530                         dev_warn(&device->cdev->dev,
531                                     "FORMAT 1 - Device check-2 error or Set "
532                                     "Sector is not complete\n");
533                         break;
534                 case 0x07:
535                         dev_warn(&device->cdev->dev,
536                                     "FORMAT 1 - Head address does not "
537                                     "compare\n");
538                         break;
539                 case 0x08:
540                         dev_warn(&device->cdev->dev,
541                                     "FORMAT 1 - Device status 1 not valid\n");
542                         break;
543                 case 0x09:
544                         dev_warn(&device->cdev->dev,
545                                     "FORMAT 1 - Device not ready\n");
546                         break;
547                 case 0x0A:
548                         dev_warn(&device->cdev->dev,
549                                     "FORMAT 1 - Track physical address did "
550                                     "not compare\n");
551                         break;
552                 case 0x0B:
553                         dev_warn(&device->cdev->dev,
554                                     "FORMAT 1 - Missing device address bit\n");
555                         break;
556                 case 0x0C:
557                         dev_warn(&device->cdev->dev,
558                                     "FORMAT 1 - Drive motor switch is off\n");
559                         break;
560                 case 0x0D:
561                         dev_warn(&device->cdev->dev,
562                                     "FORMAT 1 - Seek incomplete\n");
563                         break;
564                 case 0x0E:
565                         dev_warn(&device->cdev->dev,
566                                     "FORMAT 1 - Cylinder address did not "
567                                     "compare\n");
568                         break;
569                 case 0x0F:
570                         dev_warn(&device->cdev->dev,
571                                     "FORMAT 1 - Offset active cannot be "
572                                     "reset\n");
573                         break;
574                 default:
575                         dev_warn(&device->cdev->dev,
576                                     "FORMAT 1 - Reserved\n");
577                 }
578                 break;
579
580         case 0x20:              /* Format 2 - 3990 Equipment Checks */
581                 switch (msg_no) {
582                 case 0x08:
583                         dev_warn(&device->cdev->dev,
584                                     "FORMAT 2 - 3990 check-2 error\n");
585                         break;
586                 case 0x0E:
587                         dev_warn(&device->cdev->dev,
588                                     "FORMAT 2 - Support facility errors\n");
589                         break;
590                 case 0x0F:
591                         dev_warn(&device->cdev->dev,
592                                  "FORMAT 2 - Microcode detected error "
593                                  "%02x\n",
594                                  sense[8]);
595                         break;
596                 default:
597                         dev_warn(&device->cdev->dev,
598                                     "FORMAT 2 - Reserved\n");
599                 }
600                 break;
601
602         case 0x30:              /* Format 3 - 3990 Control Checks */
603                 switch (msg_no) {
604                 case 0x0F:
605                         dev_warn(&device->cdev->dev,
606                                     "FORMAT 3 - Allegiance terminated\n");
607                         break;
608                 default:
609                         dev_warn(&device->cdev->dev,
610                                     "FORMAT 3 - Reserved\n");
611                 }
612                 break;
613
614         case 0x40:              /* Format 4 - Data Checks */
615                 switch (msg_no) {
616                 case 0x00:
617                         dev_warn(&device->cdev->dev,
618                                     "FORMAT 4 - Home address area error\n");
619                         break;
620                 case 0x01:
621                         dev_warn(&device->cdev->dev,
622                                     "FORMAT 4 - Count area error\n");
623                         break;
624                 case 0x02:
625                         dev_warn(&device->cdev->dev,
626                                     "FORMAT 4 - Key area error\n");
627                         break;
628                 case 0x03:
629                         dev_warn(&device->cdev->dev,
630                                     "FORMAT 4 - Data area error\n");
631                         break;
632                 case 0x04:
633                         dev_warn(&device->cdev->dev,
634                                     "FORMAT 4 - No sync byte in home address "
635                                     "area\n");
636                         break;
637                 case 0x05:
638                         dev_warn(&device->cdev->dev,
639                                     "FORMAT 4 - No sync byte in count address "
640                                     "area\n");
641                         break;
642                 case 0x06:
643                         dev_warn(&device->cdev->dev,
644                                     "FORMAT 4 - No sync byte in key area\n");
645                         break;
646                 case 0x07:
647                         dev_warn(&device->cdev->dev,
648                                     "FORMAT 4 - No sync byte in data area\n");
649                         break;
650                 case 0x08:
651                         dev_warn(&device->cdev->dev,
652                                     "FORMAT 4 - Home address area error; "
653                                     "offset active\n");
654                         break;
655                 case 0x09:
656                         dev_warn(&device->cdev->dev,
657                                     "FORMAT 4 - Count area error; offset "
658                                     "active\n");
659                         break;
660                 case 0x0A:
661                         dev_warn(&device->cdev->dev,
662                                     "FORMAT 4 - Key area error; offset "
663                                     "active\n");
664                         break;
665                 case 0x0B:
666                         dev_warn(&device->cdev->dev,
667                                     "FORMAT 4 - Data area error; "
668                                     "offset active\n");
669                         break;
670                 case 0x0C:
671                         dev_warn(&device->cdev->dev,
672                                     "FORMAT 4 - No sync byte in home "
673                                     "address area; offset active\n");
674                         break;
675                 case 0x0D:
676                         dev_warn(&device->cdev->dev,
677                                     "FORMAT 4 - No syn byte in count "
678                                     "address area; offset active\n");
679                         break;
680                 case 0x0E:
681                         dev_warn(&device->cdev->dev,
682                                     "FORMAT 4 - No sync byte in key area; "
683                                     "offset active\n");
684                         break;
685                 case 0x0F:
686                         dev_warn(&device->cdev->dev,
687                                     "FORMAT 4 - No syn byte in data area; "
688                                     "offset active\n");
689                         break;
690                 default:
691                         dev_warn(&device->cdev->dev,
692                                     "FORMAT 4 - Reserved\n");
693                 }
694                 break;
695
696         case 0x50:  /* Format 5 - Data Check with displacement information */
697                 switch (msg_no) {
698                 case 0x00:
699                         dev_warn(&device->cdev->dev,
700                                     "FORMAT 5 - Data Check in the "
701                                     "home address area\n");
702                         break;
703                 case 0x01:
704                         dev_warn(&device->cdev->dev,
705                                  "FORMAT 5 - Data Check in the count "
706                                  "area\n");
707                         break;
708                 case 0x02:
709                         dev_warn(&device->cdev->dev,
710                                     "FORMAT 5 - Data Check in the key area\n");
711                         break;
712                 case 0x03:
713                         dev_warn(&device->cdev->dev,
714                                  "FORMAT 5 - Data Check in the data "
715                                  "area\n");
716                         break;
717                 case 0x08:
718                         dev_warn(&device->cdev->dev,
719                                     "FORMAT 5 - Data Check in the "
720                                     "home address area; offset active\n");
721                         break;
722                 case 0x09:
723                         dev_warn(&device->cdev->dev,
724                                     "FORMAT 5 - Data Check in the count area; "
725                                     "offset active\n");
726                         break;
727                 case 0x0A:
728                         dev_warn(&device->cdev->dev,
729                                     "FORMAT 5 - Data Check in the key area; "
730                                     "offset active\n");
731                         break;
732                 case 0x0B:
733                         dev_warn(&device->cdev->dev,
734                                     "FORMAT 5 - Data Check in the data area; "
735                                     "offset active\n");
736                         break;
737                 default:
738                         dev_warn(&device->cdev->dev,
739                                     "FORMAT 5 - Reserved\n");
740                 }
741                 break;
742
743         case 0x60:  /* Format 6 - Usage Statistics/Overrun Errors */
744                 switch (msg_no) {
745                 case 0x00:
746                         dev_warn(&device->cdev->dev,
747                                     "FORMAT 6 - Overrun on channel A\n");
748                         break;
749                 case 0x01:
750                         dev_warn(&device->cdev->dev,
751                                     "FORMAT 6 - Overrun on channel B\n");
752                         break;
753                 case 0x02:
754                         dev_warn(&device->cdev->dev,
755                                     "FORMAT 6 - Overrun on channel C\n");
756                         break;
757                 case 0x03:
758                         dev_warn(&device->cdev->dev,
759                                     "FORMAT 6 - Overrun on channel D\n");
760                         break;
761                 case 0x04:
762                         dev_warn(&device->cdev->dev,
763                                     "FORMAT 6 - Overrun on channel E\n");
764                         break;
765                 case 0x05:
766                         dev_warn(&device->cdev->dev,
767                                     "FORMAT 6 - Overrun on channel F\n");
768                         break;
769                 case 0x06:
770                         dev_warn(&device->cdev->dev,
771                                     "FORMAT 6 - Overrun on channel G\n");
772                         break;
773                 case 0x07:
774                         dev_warn(&device->cdev->dev,
775                                     "FORMAT 6 - Overrun on channel H\n");
776                         break;
777                 default:
778                         dev_warn(&device->cdev->dev,
779                                     "FORMAT 6 - Reserved\n");
780                 }
781                 break;
782
783         case 0x70:  /* Format 7 - Device Connection Control Checks */
784                 switch (msg_no) {
785                 case 0x00:
786                         dev_warn(&device->cdev->dev,
787                                     "FORMAT 7 - RCC initiated by a connection "
788                                     "check alert\n");
789                         break;
790                 case 0x01:
791                         dev_warn(&device->cdev->dev,
792                                     "FORMAT 7 - RCC 1 sequence not "
793                                     "successful\n");
794                         break;
795                 case 0x02:
796                         dev_warn(&device->cdev->dev,
797                                     "FORMAT 7 - RCC 1 and RCC 2 sequences not "
798                                     "successful\n");
799                         break;
800                 case 0x03:
801                         dev_warn(&device->cdev->dev,
802                                     "FORMAT 7 - Invalid tag-in during "
803                                     "selection sequence\n");
804                         break;
805                 case 0x04:
806                         dev_warn(&device->cdev->dev,
807                                     "FORMAT 7 - extra RCC required\n");
808                         break;
809                 case 0x05:
810                         dev_warn(&device->cdev->dev,
811                                     "FORMAT 7 - Invalid DCC selection "
812                                     "response or timeout\n");
813                         break;
814                 case 0x06:
815                         dev_warn(&device->cdev->dev,
816                                     "FORMAT 7 - Missing end operation; device "
817                                     "transfer complete\n");
818                         break;
819                 case 0x07:
820                         dev_warn(&device->cdev->dev,
821                                     "FORMAT 7 - Missing end operation; device "
822                                     "transfer incomplete\n");
823                         break;
824                 case 0x08:
825                         dev_warn(&device->cdev->dev,
826                                     "FORMAT 7 - Invalid tag-in for an "
827                                     "immediate command sequence\n");
828                         break;
829                 case 0x09:
830                         dev_warn(&device->cdev->dev,
831                                     "FORMAT 7 - Invalid tag-in for an "
832                                     "extended command sequence\n");
833                         break;
834                 case 0x0A:
835                         dev_warn(&device->cdev->dev,
836                                     "FORMAT 7 - 3990 microcode time out when "
837                                     "stopping selection\n");
838                         break;
839                 case 0x0B:
840                         dev_warn(&device->cdev->dev,
841                                     "FORMAT 7 - No response to selection "
842                                     "after a poll interruption\n");
843                         break;
844                 case 0x0C:
845                         dev_warn(&device->cdev->dev,
846                                     "FORMAT 7 - Permanent path error (DASD "
847                                     "controller not available)\n");
848                         break;
849                 case 0x0D:
850                         dev_warn(&device->cdev->dev,
851                                     "FORMAT 7 - DASD controller not available"
852                                     " on disconnected command chain\n");
853                         break;
854                 default:
855                         dev_warn(&device->cdev->dev,
856                                     "FORMAT 7 - Reserved\n");
857                 }
858                 break;
859
860         case 0x80:  /* Format 8 - Additional Device Equipment Checks */
861                 switch (msg_no) {
862                 case 0x00:      /* No Message */
863                 case 0x01:
864                         dev_warn(&device->cdev->dev,
865                                     "FORMAT 8 - Error correction code "
866                                     "hardware fault\n");
867                         break;
868                 case 0x03:
869                         dev_warn(&device->cdev->dev,
870                                     "FORMAT 8 - Unexpected end operation "
871                                     "response code\n");
872                         break;
873                 case 0x04:
874                         dev_warn(&device->cdev->dev,
875                                     "FORMAT 8 - End operation with transfer "
876                                     "count not zero\n");
877                         break;
878                 case 0x05:
879                         dev_warn(&device->cdev->dev,
880                                     "FORMAT 8 - End operation with transfer "
881                                     "count zero\n");
882                         break;
883                 case 0x06:
884                         dev_warn(&device->cdev->dev,
885                                     "FORMAT 8 - DPS checks after a system "
886                                     "reset or selective reset\n");
887                         break;
888                 case 0x07:
889                         dev_warn(&device->cdev->dev,
890                                     "FORMAT 8 - DPS cannot be filled\n");
891                         break;
892                 case 0x08:
893                         dev_warn(&device->cdev->dev,
894                                     "FORMAT 8 - Short busy time-out during "
895                                     "device selection\n");
896                         break;
897                 case 0x09:
898                         dev_warn(&device->cdev->dev,
899                                     "FORMAT 8 - DASD controller failed to "
900                                     "set or reset the long busy latch\n");
901                         break;
902                 case 0x0A:
903                         dev_warn(&device->cdev->dev,
904                                     "FORMAT 8 - No interruption from device "
905                                     "during a command chain\n");
906                         break;
907                 default:
908                         dev_warn(&device->cdev->dev,
909                                     "FORMAT 8 - Reserved\n");
910                 }
911                 break;
912
913         case 0x90:  /* Format 9 - Device Read, Write, and Seek Checks */
914                 switch (msg_no) {
915                 case 0x00:
916                         break;  /* No Message */
917                 case 0x06:
918                         dev_warn(&device->cdev->dev,
919                                     "FORMAT 9 - Device check-2 error\n");
920                         break;
921                 case 0x07:
922                         dev_warn(&device->cdev->dev,
923                                  "FORMAT 9 - Head address did not "
924                                  "compare\n");
925                         break;
926                 case 0x0A:
927                         dev_warn(&device->cdev->dev,
928                                     "FORMAT 9 - Track physical address did "
929                                     "not compare while oriented\n");
930                         break;
931                 case 0x0E:
932                         dev_warn(&device->cdev->dev,
933                                     "FORMAT 9 - Cylinder address did not "
934                                     "compare\n");
935                         break;
936                 default:
937                         dev_warn(&device->cdev->dev,
938                                     "FORMAT 9 - Reserved\n");
939                 }
940                 break;
941
942         case 0xF0:              /* Format F - Cache Storage Checks */
943                 switch (msg_no) {
944                 case 0x00:
945                         dev_warn(&device->cdev->dev,
946                                     "FORMAT F - Operation Terminated\n");
947                         break;
948                 case 0x01:
949                         dev_warn(&device->cdev->dev,
950                                     "FORMAT F - Subsystem Processing Error\n");
951                         break;
952                 case 0x02:
953                         dev_warn(&device->cdev->dev,
954                                     "FORMAT F - Cache or nonvolatile storage "
955                                     "equipment failure\n");
956                         break;
957                 case 0x04:
958                         dev_warn(&device->cdev->dev,
959                                     "FORMAT F - Caching terminated\n");
960                         break;
961                 case 0x06:
962                         dev_warn(&device->cdev->dev,
963                                     "FORMAT F - Cache fast write access not "
964                                     "authorized\n");
965                         break;
966                 case 0x07:
967                         dev_warn(&device->cdev->dev,
968                                     "FORMAT F - Track format incorrect\n");
969                         break;
970                 case 0x09:
971                         dev_warn(&device->cdev->dev,
972                                     "FORMAT F - Caching reinitiated\n");
973                         break;
974                 case 0x0A:
975                         dev_warn(&device->cdev->dev,
976                                     "FORMAT F - Nonvolatile storage "
977                                     "terminated\n");
978                         break;
979                 case 0x0B:
980                         dev_warn(&device->cdev->dev,
981                                     "FORMAT F - Volume is suspended duplex\n");
982                         /* call extended error reporting (EER) */
983                         dasd_eer_write(device, erp->refers,
984                                        DASD_EER_PPRCSUSPEND);
985                         break;
986                 case 0x0C:
987                         dev_warn(&device->cdev->dev,
988                                     "FORMAT F - Subsystem status cannot be "
989                                     "determined\n");
990                         break;
991                 case 0x0D:
992                         dev_warn(&device->cdev->dev,
993                                     "FORMAT F - Caching status reset to "
994                                     "default\n");
995                         break;
996                 case 0x0E:
997                         dev_warn(&device->cdev->dev,
998                                     "FORMAT F - DASD Fast Write inhibited\n");
999                         break;
1000                 default:
1001                         dev_warn(&device->cdev->dev,
1002                                     "FORMAT D - Reserved\n");
1003                 }
1004                 break;
1005
1006         default:        /* unknown message format - should not happen
1007                            internal error 03 - unknown message format */
1008                 snprintf(errorstring, ERRORLENGTH, "03 %x02", msg_format);
1009                 dev_err(&device->cdev->dev,
1010                          "An error occurred in the DASD device driver, "
1011                          "reason=%s\n", errorstring);
1012                 break;
1013         }                       /* end switch message format */
1014
1015 }                               /* end dasd_3990_handle_env_data */
1016
1017 /*
1018  * DASD_3990_ERP_COM_REJ
1019  *
1020  * DESCRIPTION
1021  *   Handles 24 byte 'Command Reject' error.
1022  *
1023  * PARAMETER
1024  *   erp                current erp_head
1025  *   sense              current sense data
1026  *
1027  * RETURN VALUES
1028  *   erp                'new' erp_head - pointer to new ERP
1029  */
1030 static struct dasd_ccw_req *
1031 dasd_3990_erp_com_rej(struct dasd_ccw_req * erp, char *sense)
1032 {
1033
1034         struct dasd_device *device = erp->startdev;
1035
1036         erp->function = dasd_3990_erp_com_rej;
1037
1038         /* env data present (ACTION 10 - retry should work) */
1039         if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1040
1041                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1042                             "Command Reject - environmental data present");
1043
1044                 dasd_3990_handle_env_data(erp, sense);
1045
1046                 erp->retries = 5;
1047
1048         } else if (sense[1] & SNS1_WRITE_INHIBITED) {
1049                 dev_err(&device->cdev->dev, "An I/O request was rejected"
1050                         " because writing is inhibited\n");
1051                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1052         } else {
1053                 /* fatal error -  set status to FAILED
1054                    internal error 09 - Command Reject */
1055                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1056                         "device driver, reason=%s\n", "09");
1057
1058                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1059         }
1060
1061         return erp;
1062
1063 }                               /* end dasd_3990_erp_com_rej */
1064
1065 /*
1066  * DASD_3990_ERP_BUS_OUT
1067  *
1068  * DESCRIPTION
1069  *   Handles 24 byte 'Bus Out Parity Check' error.
1070  *
1071  * PARAMETER
1072  *   erp                current erp_head
1073  * RETURN VALUES
1074  *   erp                new erp_head - pointer to new ERP
1075  */
1076 static struct dasd_ccw_req *
1077 dasd_3990_erp_bus_out(struct dasd_ccw_req * erp)
1078 {
1079
1080         struct dasd_device *device = erp->startdev;
1081
1082         /* first time set initial retry counter and erp_function */
1083         /* and retry once without blocking queue                 */
1084         /* (this enables easier enqueing of the cqr)             */
1085         if (erp->function != dasd_3990_erp_bus_out) {
1086                 erp->retries = 256;
1087                 erp->function = dasd_3990_erp_bus_out;
1088
1089         } else {
1090
1091                 /* issue a message and wait for 'device ready' interrupt */
1092                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1093                             "bus out parity error or BOPC requested by "
1094                             "channel");
1095
1096                 dasd_3990_erp_block_queue(erp, 60*HZ);
1097
1098         }
1099
1100         return erp;
1101
1102 }                               /* end dasd_3990_erp_bus_out */
1103
1104 /*
1105  * DASD_3990_ERP_EQUIP_CHECK
1106  *
1107  * DESCRIPTION
1108  *   Handles 24 byte 'Equipment Check' error.
1109  *
1110  * PARAMETER
1111  *   erp                current erp_head
1112  * RETURN VALUES
1113  *   erp                new erp_head - pointer to new ERP
1114  */
1115 static struct dasd_ccw_req *
1116 dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense)
1117 {
1118
1119         struct dasd_device *device = erp->startdev;
1120
1121         erp->function = dasd_3990_erp_equip_check;
1122
1123         if (sense[1] & SNS1_WRITE_INHIBITED) {
1124                 dev_info(&device->cdev->dev,
1125                             "Write inhibited path encountered\n");
1126
1127                 /* vary path offline
1128                    internal error 04 - Path should be varied off-line.*/
1129                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1130                         "device driver, reason=%s\n", "04");
1131
1132                 erp = dasd_3990_erp_action_1(erp);
1133
1134         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1135
1136                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1137                             "Equipment Check - " "environmental data present");
1138
1139                 dasd_3990_handle_env_data(erp, sense);
1140
1141                 erp = dasd_3990_erp_action_4(erp, sense);
1142
1143         } else if (sense[1] & SNS1_PERM_ERR) {
1144
1145                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1146                             "Equipment Check - retry exhausted or "
1147                             "undesirable");
1148
1149                 erp = dasd_3990_erp_action_1(erp);
1150
1151         } else {
1152                 /* all other equipment checks - Action 5 */
1153                 /* rest is done when retries == 0 */
1154                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1155                             "Equipment check or processing error");
1156
1157                 erp = dasd_3990_erp_action_5(erp);
1158         }
1159         return erp;
1160
1161 }                               /* end dasd_3990_erp_equip_check */
1162
1163 /*
1164  * DASD_3990_ERP_DATA_CHECK
1165  *
1166  * DESCRIPTION
1167  *   Handles 24 byte 'Data Check' error.
1168  *
1169  * PARAMETER
1170  *   erp                current erp_head
1171  * RETURN VALUES
1172  *   erp                new erp_head - pointer to new ERP
1173  */
1174 static struct dasd_ccw_req *
1175 dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense)
1176 {
1177
1178         struct dasd_device *device = erp->startdev;
1179
1180         erp->function = dasd_3990_erp_data_check;
1181
1182         if (sense[2] & SNS2_CORRECTABLE) {      /* correctable data check */
1183
1184                 /* issue message that the data has been corrected */
1185                 dev_emerg(&device->cdev->dev,
1186                             "Data recovered during retry with PCI "
1187                             "fetch mode active\n");
1188
1189                 /* not possible to handle this situation in Linux */
1190                 panic("No way to inform application about the possibly "
1191                       "incorrect data");
1192
1193         } else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1194
1195                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1196                             "Uncorrectable data check recovered secondary "
1197                             "addr of duplex pair");
1198
1199                 erp = dasd_3990_erp_action_4(erp, sense);
1200
1201         } else if (sense[1] & SNS1_PERM_ERR) {
1202
1203                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1204                             "Uncorrectable data check with internal "
1205                             "retry exhausted");
1206
1207                 erp = dasd_3990_erp_action_1(erp);
1208
1209         } else {
1210                 /* all other data checks */
1211                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1212                             "Uncorrectable data check with retry count "
1213                             "exhausted...");
1214
1215                 erp = dasd_3990_erp_action_5(erp);
1216         }
1217
1218         return erp;
1219
1220 }                               /* end dasd_3990_erp_data_check */
1221
1222 /*
1223  * DASD_3990_ERP_OVERRUN
1224  *
1225  * DESCRIPTION
1226  *   Handles 24 byte 'Overrun' error.
1227  *
1228  * PARAMETER
1229  *   erp                current erp_head
1230  * RETURN VALUES
1231  *   erp                new erp_head - pointer to new ERP
1232  */
1233 static struct dasd_ccw_req *
1234 dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense)
1235 {
1236
1237         struct dasd_device *device = erp->startdev;
1238
1239         erp->function = dasd_3990_erp_overrun;
1240
1241         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1242                     "Overrun - service overrun or overrun"
1243                     " error requested by channel");
1244
1245         erp = dasd_3990_erp_action_5(erp);
1246
1247         return erp;
1248
1249 }                               /* end dasd_3990_erp_overrun */
1250
1251 /*
1252  * DASD_3990_ERP_INV_FORMAT
1253  *
1254  * DESCRIPTION
1255  *   Handles 24 byte 'Invalid Track Format' error.
1256  *
1257  * PARAMETER
1258  *   erp                current erp_head
1259  * RETURN VALUES
1260  *   erp                new erp_head - pointer to new ERP
1261  */
1262 static struct dasd_ccw_req *
1263 dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense)
1264 {
1265
1266         struct dasd_device *device = erp->startdev;
1267
1268         erp->function = dasd_3990_erp_inv_format;
1269
1270         if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1271
1272                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1273                             "Track format error when destaging or "
1274                             "staging data");
1275
1276                 dasd_3990_handle_env_data(erp, sense);
1277
1278                 erp = dasd_3990_erp_action_4(erp, sense);
1279
1280         } else {
1281                 /* internal error 06 - The track format is not valid*/
1282                 dev_err(&device->cdev->dev,
1283                         "An error occurred in the DASD device driver, "
1284                         "reason=%s\n", "06");
1285
1286                 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1287         }
1288
1289         return erp;
1290
1291 }                               /* end dasd_3990_erp_inv_format */
1292
1293 /*
1294  * DASD_3990_ERP_EOC
1295  *
1296  * DESCRIPTION
1297  *   Handles 24 byte 'End-of-Cylinder' error.
1298  *
1299  * PARAMETER
1300  *   erp                already added default erp
1301  * RETURN VALUES
1302  *   erp                pointer to original (failed) cqr.
1303  */
1304 static struct dasd_ccw_req *
1305 dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense)
1306 {
1307
1308         struct dasd_device *device = default_erp->startdev;
1309
1310         dev_err(&device->cdev->dev,
1311                 "The cylinder data for accessing the DASD is inconsistent\n");
1312
1313         /* implement action 7 - BUG */
1314         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1315
1316 }                               /* end dasd_3990_erp_EOC */
1317
1318 /*
1319  * DASD_3990_ERP_ENV_DATA
1320  *
1321  * DESCRIPTION
1322  *   Handles 24 byte 'Environmental-Data Present' error.
1323  *
1324  * PARAMETER
1325  *   erp                current erp_head
1326  * RETURN VALUES
1327  *   erp                new erp_head - pointer to new ERP
1328  */
1329 static struct dasd_ccw_req *
1330 dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense)
1331 {
1332
1333         struct dasd_device *device = erp->startdev;
1334
1335         erp->function = dasd_3990_erp_env_data;
1336
1337         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Environmental data present");
1338
1339         dasd_3990_handle_env_data(erp, sense);
1340
1341         /* don't retry on disabled interface */
1342         if (sense[7] != 0x0F) {
1343                 erp = dasd_3990_erp_action_4(erp, sense);
1344         } else {
1345                 erp->status = DASD_CQR_FILLED;
1346         }
1347
1348         return erp;
1349
1350 }                               /* end dasd_3990_erp_env_data */
1351
1352 /*
1353  * DASD_3990_ERP_NO_REC
1354  *
1355  * DESCRIPTION
1356  *   Handles 24 byte 'No Record Found' error.
1357  *
1358  * PARAMETER
1359  *   erp                already added default ERP
1360  *
1361  * RETURN VALUES
1362  *   erp                new erp_head - pointer to new ERP
1363  */
1364 static struct dasd_ccw_req *
1365 dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense)
1366 {
1367
1368         struct dasd_device *device = default_erp->startdev;
1369
1370         dev_err(&device->cdev->dev,
1371                     "The specified record was not found\n");
1372
1373         return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1374
1375 }                               /* end dasd_3990_erp_no_rec */
1376
1377 /*
1378  * DASD_3990_ERP_FILE_PROT
1379  *
1380  * DESCRIPTION
1381  *   Handles 24 byte 'File Protected' error.
1382  *   Note: Seek related recovery is not implemented because
1383  *         wee don't use the seek command yet.
1384  *
1385  * PARAMETER
1386  *   erp                current erp_head
1387  * RETURN VALUES
1388  *   erp                new erp_head - pointer to new ERP
1389  */
1390 static struct dasd_ccw_req *
1391 dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
1392 {
1393
1394         struct dasd_device *device = erp->startdev;
1395
1396         dev_err(&device->cdev->dev, "Accessing the DASD failed because of "
1397                 "a hardware error\n");
1398
1399         return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1400
1401 }                               /* end dasd_3990_erp_file_prot */
1402
1403 /*
1404  * DASD_3990_ERP_INSPECT_ALIAS
1405  *
1406  * DESCRIPTION
1407  *   Checks if the original request was started on an alias device.
1408  *   If yes, it modifies the original and the erp request so that
1409  *   the erp request can be started on a base device.
1410  *
1411  * PARAMETER
1412  *   erp                pointer to the currently created default ERP
1413  *
1414  * RETURN VALUES
1415  *   erp                pointer to the modified ERP, or NULL
1416  */
1417
1418 static struct dasd_ccw_req *dasd_3990_erp_inspect_alias(
1419                                                 struct dasd_ccw_req *erp)
1420 {
1421         struct dasd_ccw_req *cqr = erp->refers;
1422         char *sense;
1423
1424         if (cqr->block &&
1425             (cqr->block->base != cqr->startdev)) {
1426
1427                 sense = dasd_get_sense(&erp->refers->irb);
1428                 /*
1429                  * dynamic pav may have changed base alias mapping
1430                  */
1431                 if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense
1432                     && (sense[0] == 0x10) && (sense[7] == 0x0F)
1433                     && (sense[8] == 0x67)) {
1434                         /*
1435                          * remove device from alias handling to prevent new
1436                          * requests from being scheduled on the
1437                          * wrong alias device
1438                          */
1439                         dasd_alias_remove_device(cqr->startdev);
1440
1441                         /* schedule worker to reload device */
1442                         dasd_reload_device(cqr->startdev);
1443                 }
1444
1445                 if (cqr->startdev->features & DASD_FEATURE_ERPLOG) {
1446                         DBF_DEV_EVENT(DBF_ERR, cqr->startdev,
1447                                     "ERP on alias device for request %p,"
1448                                     " recover on base device %s", cqr,
1449                                     dev_name(&cqr->block->base->cdev->dev));
1450                 }
1451                 dasd_eckd_reset_ccw_to_base_io(cqr);
1452                 erp->startdev = cqr->block->base;
1453                 erp->function = dasd_3990_erp_inspect_alias;
1454                 return erp;
1455         } else
1456                 return NULL;
1457 }
1458
1459
1460 /*
1461  * DASD_3990_ERP_INSPECT_24
1462  *
1463  * DESCRIPTION
1464  *   Does a detailed inspection of the 24 byte sense data
1465  *   and sets up a related error recovery action.
1466  *
1467  * PARAMETER
1468  *   sense              sense data of the actual error
1469  *   erp                pointer to the currently created default ERP
1470  *
1471  * RETURN VALUES
1472  *   erp                pointer to the (addtitional) ERP
1473  */
1474 static struct dasd_ccw_req *
1475 dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense)
1476 {
1477
1478         struct dasd_ccw_req *erp_filled = NULL;
1479
1480         /* Check sense for ....    */
1481         /* 'Command Reject'        */
1482         if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) {
1483                 erp_filled = dasd_3990_erp_com_rej(erp, sense);
1484         }
1485         /* 'Intervention Required' */
1486         if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) {
1487                 erp_filled = dasd_3990_erp_int_req(erp);
1488         }
1489         /* 'Bus Out Parity Check'  */
1490         if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) {
1491                 erp_filled = dasd_3990_erp_bus_out(erp);
1492         }
1493         /* 'Equipment Check'       */
1494         if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) {
1495                 erp_filled = dasd_3990_erp_equip_check(erp, sense);
1496         }
1497         /* 'Data Check'            */
1498         if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) {
1499                 erp_filled = dasd_3990_erp_data_check(erp, sense);
1500         }
1501         /* 'Overrun'               */
1502         if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) {
1503                 erp_filled = dasd_3990_erp_overrun(erp, sense);
1504         }
1505         /* 'Invalid Track Format'  */
1506         if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) {
1507                 erp_filled = dasd_3990_erp_inv_format(erp, sense);
1508         }
1509         /* 'End-of-Cylinder'       */
1510         if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) {
1511                 erp_filled = dasd_3990_erp_EOC(erp, sense);
1512         }
1513         /* 'Environmental Data'    */
1514         if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) {
1515                 erp_filled = dasd_3990_erp_env_data(erp, sense);
1516         }
1517         /* 'No Record Found'       */
1518         if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) {
1519                 erp_filled = dasd_3990_erp_no_rec(erp, sense);
1520         }
1521         /* 'File Protected'        */
1522         if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) {
1523                 erp_filled = dasd_3990_erp_file_prot(erp);
1524         }
1525         /* other (unknown) error - do default ERP */
1526         if (erp_filled == NULL) {
1527
1528                 erp_filled = erp;
1529         }
1530
1531         return erp_filled;
1532
1533 }                               /* END dasd_3990_erp_inspect_24 */
1534
1535 /*
1536  *****************************************************************************
1537  * 32 byte sense ERP functions (only)
1538  *****************************************************************************
1539  */
1540
1541 /*
1542  * DASD_3990_ERPACTION_10_32
1543  *
1544  * DESCRIPTION
1545  *   Handles 32 byte 'Action 10' of Single Program Action Codes.
1546  *   Just retry and if retry doesn't work, return with error.
1547  *
1548  * PARAMETER
1549  *   erp                current erp_head
1550  *   sense              current sense data
1551  * RETURN VALUES
1552  *   erp                modified erp_head
1553  */
1554 static struct dasd_ccw_req *
1555 dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense)
1556 {
1557
1558         struct dasd_device *device = erp->startdev;
1559
1560         erp->retries = 256;
1561         erp->function = dasd_3990_erp_action_10_32;
1562
1563         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Perform logging requested");
1564
1565         return erp;
1566
1567 }                               /* end dasd_3990_erp_action_10_32 */
1568
1569 /*
1570  * DASD_3990_ERP_ACTION_1B_32
1571  *
1572  * DESCRIPTION
1573  *   Handles 32 byte 'Action 1B' of Single Program Action Codes.
1574  *   A write operation could not be finished because of an unexpected
1575  *   condition.
1576  *   The already created 'default erp' is used to get the link to
1577  *   the erp chain, but it can not be used for this recovery
1578  *   action because it contains no DE/LO data space.
1579  *
1580  * PARAMETER
1581  *   default_erp        already added default erp.
1582  *   sense              current sense data
1583  *
1584  * RETURN VALUES
1585  *   erp                new erp or
1586  *                      default_erp in case of imprecise ending or error
1587  */
1588 static struct dasd_ccw_req *
1589 dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
1590 {
1591
1592         struct dasd_device *device = default_erp->startdev;
1593         __u32 cpa = 0;
1594         struct dasd_ccw_req *cqr;
1595         struct dasd_ccw_req *erp;
1596         struct DE_eckd_data *DE_data;
1597         struct PFX_eckd_data *PFX_data;
1598         char *LO_data;          /* LO_eckd_data_t */
1599         struct ccw1 *ccw, *oldccw;
1600
1601         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1602                     "Write not finished because of unexpected condition");
1603
1604         default_erp->function = dasd_3990_erp_action_1B_32;
1605
1606         /* determine the original cqr */
1607         cqr = default_erp;
1608
1609         while (cqr->refers != NULL) {
1610                 cqr = cqr->refers;
1611         }
1612
1613         if (scsw_is_tm(&cqr->irb.scsw)) {
1614                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1615                               "32 bit sense, action 1B is not defined"
1616                               " in transport mode - just retry");
1617                 return default_erp;
1618         }
1619
1620         /* for imprecise ending just do default erp */
1621         if (sense[1] & 0x01) {
1622                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1623                             "Imprecise ending is set - just retry");
1624
1625                 return default_erp;
1626         }
1627
1628         /* determine the address of the CCW to be restarted */
1629         /* Imprecise ending is not set -> addr from IRB-SCSW */
1630         cpa = default_erp->refers->irb.scsw.cmd.cpa;
1631
1632         if (cpa == 0) {
1633                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1634                             "Unable to determine address of the CCW "
1635                             "to be restarted");
1636
1637                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1638         }
1639
1640         /* Build new ERP request including DE/LO */
1641         erp = dasd_alloc_erp_request((char *) &cqr->magic,
1642                                      2 + 1,/* DE/LO + TIC */
1643                                      sizeof(struct DE_eckd_data) +
1644                                      sizeof(struct LO_eckd_data), device);
1645
1646         if (IS_ERR(erp)) {
1647                 /* internal error 01 - Unable to allocate ERP */
1648                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1649                         "device driver, reason=%s\n", "01");
1650                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1651         }
1652
1653         /* use original DE */
1654         DE_data = erp->data;
1655         oldccw = cqr->cpaddr;
1656         if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) {
1657                 PFX_data = cqr->data;
1658                 memcpy(DE_data, &PFX_data->define_extent,
1659                        sizeof(struct DE_eckd_data));
1660         } else
1661                 memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data));
1662
1663         /* create LO */
1664         LO_data = erp->data + sizeof(struct DE_eckd_data);
1665
1666         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1667                 /* should not */
1668                 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1669         }
1670
1671         if ((sense[7] & 0x3F) == 0x01) {
1672                 /* operation code is WRITE DATA -> data area orientation */
1673                 LO_data[0] = 0x81;
1674
1675         } else if ((sense[7] & 0x3F) == 0x03) {
1676                 /* operation code is FORMAT WRITE -> index orientation */
1677                 LO_data[0] = 0xC3;
1678
1679         } else {
1680                 LO_data[0] = sense[7];  /* operation */
1681         }
1682
1683         LO_data[1] = sense[8];  /* auxiliary */
1684         LO_data[2] = sense[9];
1685         LO_data[3] = sense[3];  /* count */
1686         LO_data[4] = sense[29]; /* seek_addr.cyl */
1687         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1688         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1689
1690         memcpy(&(LO_data[8]), &(sense[11]), 8);
1691
1692         /* create DE ccw */
1693         ccw = erp->cpaddr;
1694         memset(ccw, 0, sizeof(struct ccw1));
1695         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
1696         ccw->flags = CCW_FLAG_CC;
1697         ccw->count = 16;
1698         ccw->cda = (__u32)(addr_t) DE_data;
1699
1700         /* create LO ccw */
1701         ccw++;
1702         memset(ccw, 0, sizeof(struct ccw1));
1703         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
1704         ccw->flags = CCW_FLAG_CC;
1705         ccw->count = 16;
1706         ccw->cda = (__u32)(addr_t) LO_data;
1707
1708         /* TIC to the failed ccw */
1709         ccw++;
1710         ccw->cmd_code = CCW_CMD_TIC;
1711         ccw->cda = cpa;
1712
1713         /* fill erp related fields */
1714         erp->flags = default_erp->flags;
1715         erp->function = dasd_3990_erp_action_1B_32;
1716         erp->refers = default_erp->refers;
1717         erp->startdev = device;
1718         erp->memdev = device;
1719         erp->magic = default_erp->magic;
1720         erp->expires = 0;
1721         erp->retries = 256;
1722         erp->buildclk = get_clock();
1723         erp->status = DASD_CQR_FILLED;
1724
1725         /* remove the default erp */
1726         dasd_free_erp_request(default_erp, device);
1727
1728         return erp;
1729
1730 }                               /* end dasd_3990_erp_action_1B_32 */
1731
1732 /*
1733  * DASD_3990_UPDATE_1B
1734  *
1735  * DESCRIPTION
1736  *   Handles the update to the 32 byte 'Action 1B' of Single Program
1737  *   Action Codes in case the first action was not successful.
1738  *   The already created 'previous_erp' is the currently not successful
1739  *   ERP.
1740  *
1741  * PARAMETER
1742  *   previous_erp       already created previous erp.
1743  *   sense              current sense data
1744  * RETURN VALUES
1745  *   erp                modified erp
1746  */
1747 static struct dasd_ccw_req *
1748 dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense)
1749 {
1750
1751         struct dasd_device *device = previous_erp->startdev;
1752         __u32 cpa = 0;
1753         struct dasd_ccw_req *cqr;
1754         struct dasd_ccw_req *erp;
1755         char *LO_data;          /* struct LO_eckd_data */
1756         struct ccw1 *ccw;
1757
1758         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1759                     "Write not finished because of unexpected condition"
1760                     " - follow on");
1761
1762         /* determine the original cqr */
1763         cqr = previous_erp;
1764
1765         while (cqr->refers != NULL) {
1766                 cqr = cqr->refers;
1767         }
1768
1769         if (scsw_is_tm(&cqr->irb.scsw)) {
1770                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1771                               "32 bit sense, action 1B, update,"
1772                               " in transport mode - just retry");
1773                 return previous_erp;
1774         }
1775
1776         /* for imprecise ending just do default erp */
1777         if (sense[1] & 0x01) {
1778                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1779                             "Imprecise ending is set - just retry");
1780
1781                 previous_erp->status = DASD_CQR_FILLED;
1782
1783                 return previous_erp;
1784         }
1785
1786         /* determine the address of the CCW to be restarted */
1787         /* Imprecise ending is not set -> addr from IRB-SCSW */
1788         cpa = previous_erp->irb.scsw.cmd.cpa;
1789
1790         if (cpa == 0) {
1791                 /* internal error 02 -
1792                    Unable to determine address of the CCW to be restarted */
1793                 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1794                         "device driver, reason=%s\n", "02");
1795
1796                 previous_erp->status = DASD_CQR_FAILED;
1797
1798                 return previous_erp;
1799         }
1800
1801         erp = previous_erp;
1802
1803         /* update the LO with the new returned sense data  */
1804         LO_data = erp->data + sizeof(struct DE_eckd_data);
1805
1806         if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1807                 /* should not happen */
1808                 previous_erp->status = DASD_CQR_FAILED;
1809
1810                 return previous_erp;
1811         }
1812
1813         if ((sense[7] & 0x3F) == 0x01) {
1814                 /* operation code is WRITE DATA -> data area orientation */
1815                 LO_data[0] = 0x81;
1816
1817         } else if ((sense[7] & 0x3F) == 0x03) {
1818                 /* operation code is FORMAT WRITE -> index orientation */
1819                 LO_data[0] = 0xC3;
1820
1821         } else {
1822                 LO_data[0] = sense[7];  /* operation */
1823         }
1824
1825         LO_data[1] = sense[8];  /* auxiliary */
1826         LO_data[2] = sense[9];
1827         LO_data[3] = sense[3];  /* count */
1828         LO_data[4] = sense[29]; /* seek_addr.cyl */
1829         LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
1830         LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
1831
1832         memcpy(&(LO_data[8]), &(sense[11]), 8);
1833
1834         /* TIC to the failed ccw */
1835         ccw = erp->cpaddr;      /* addr of DE ccw */
1836         ccw++;                  /* addr of LE ccw */
1837         ccw++;                  /* addr of TIC ccw */
1838         ccw->cda = cpa;
1839
1840         erp->status = DASD_CQR_FILLED;
1841
1842         return erp;
1843
1844 }                               /* end dasd_3990_update_1B */
1845
1846 /*
1847  * DASD_3990_ERP_COMPOUND_RETRY
1848  *
1849  * DESCRIPTION
1850  *   Handles the compound ERP action retry code.
1851  *   NOTE: At least one retry is done even if zero is specified
1852  *         by the sense data. This makes enqueueing of the request
1853  *         easier.
1854  *
1855  * PARAMETER
1856  *   sense              sense data of the actual error
1857  *   erp                pointer to the currently created ERP
1858  *
1859  * RETURN VALUES
1860  *   erp                modified ERP pointer
1861  *
1862  */
1863 static void
1864 dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
1865 {
1866
1867         switch (sense[25] & 0x03) {
1868         case 0x00:              /* no not retry */
1869                 erp->retries = 1;
1870                 break;
1871
1872         case 0x01:              /* retry 2 times */
1873                 erp->retries = 2;
1874                 break;
1875
1876         case 0x02:              /* retry 10 times */
1877                 erp->retries = 10;
1878                 break;
1879
1880         case 0x03:              /* retry 256 times */
1881                 erp->retries = 256;
1882                 break;
1883
1884         default:
1885                 BUG();
1886         }
1887
1888         erp->function = dasd_3990_erp_compound_retry;
1889
1890 }                               /* end dasd_3990_erp_compound_retry */
1891
1892 /*
1893  * DASD_3990_ERP_COMPOUND_PATH
1894  *
1895  * DESCRIPTION
1896  *   Handles the compound ERP action for retry on alternate
1897  *   channel path.
1898  *
1899  * PARAMETER
1900  *   sense              sense data of the actual error
1901  *   erp                pointer to the currently created ERP
1902  *
1903  * RETURN VALUES
1904  *   erp                modified ERP pointer
1905  *
1906  */
1907 static void
1908 dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
1909 {
1910
1911         if (sense[25] & DASD_SENSE_BIT_3) {
1912                 dasd_3990_erp_alternate_path(erp);
1913
1914                 if (erp->status == DASD_CQR_FAILED) {
1915                         /* reset the lpm and the status to be able to
1916                          * try further actions. */
1917
1918                         erp->lpm = 0;
1919                         erp->status = DASD_CQR_NEED_ERP;
1920                 }
1921         }
1922
1923         erp->function = dasd_3990_erp_compound_path;
1924
1925 }                               /* end dasd_3990_erp_compound_path */
1926
1927 /*
1928  * DASD_3990_ERP_COMPOUND_CODE
1929  *
1930  * DESCRIPTION
1931  *   Handles the compound ERP action for retry code.
1932  *
1933  * PARAMETER
1934  *   sense              sense data of the actual error
1935  *   erp                pointer to the currently created ERP
1936  *
1937  * RETURN VALUES
1938  *   erp                NEW ERP pointer
1939  *
1940  */
1941 static struct dasd_ccw_req *
1942 dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense)
1943 {
1944
1945         if (sense[25] & DASD_SENSE_BIT_2) {
1946
1947                 switch (sense[28]) {
1948                 case 0x17:
1949                         /* issue a Diagnostic Control command with an
1950                          * Inhibit Write subcommand and controller modifier */
1951                         erp = dasd_3990_erp_DCTL(erp, 0x20);
1952                         break;
1953
1954                 case 0x25:
1955                         /* wait for 5 seconds and retry again */
1956                         erp->retries = 1;
1957
1958                         dasd_3990_erp_block_queue (erp, 5*HZ);
1959                         break;
1960
1961                 default:
1962                         /* should not happen - continue */
1963                         break;
1964                 }
1965         }
1966
1967         erp->function = dasd_3990_erp_compound_code;
1968
1969         return erp;
1970
1971 }                               /* end dasd_3990_erp_compound_code */
1972
1973 /*
1974  * DASD_3990_ERP_COMPOUND_CONFIG
1975  *
1976  * DESCRIPTION
1977  *   Handles the compound ERP action for configruation
1978  *   dependent error.
1979  *   Note: duplex handling is not implemented (yet).
1980  *
1981  * PARAMETER
1982  *   sense              sense data of the actual error
1983  *   erp                pointer to the currently created ERP
1984  *
1985  * RETURN VALUES
1986  *   erp                modified ERP pointer
1987  *
1988  */
1989 static void
1990 dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense)
1991 {
1992
1993         if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) {
1994
1995                 /* set to suspended duplex state then restart
1996                    internal error 05 - Set device to suspended duplex state
1997                    should be done */
1998                 struct dasd_device *device = erp->startdev;
1999                 dev_err(&device->cdev->dev,
2000                         "An error occurred in the DASD device driver, "
2001                         "reason=%s\n", "05");
2002
2003         }
2004
2005         erp->function = dasd_3990_erp_compound_config;
2006
2007 }                               /* end dasd_3990_erp_compound_config */
2008
2009 /*
2010  * DASD_3990_ERP_COMPOUND
2011  *
2012  * DESCRIPTION
2013  *   Does the further compound program action if
2014  *   compound retry was not successful.
2015  *
2016  * PARAMETER
2017  *   sense              sense data of the actual error
2018  *   erp                pointer to the current (failed) ERP
2019  *
2020  * RETURN VALUES
2021  *   erp                (additional) ERP pointer
2022  *
2023  */
2024 static struct dasd_ccw_req *
2025 dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense)
2026 {
2027
2028         if ((erp->function == dasd_3990_erp_compound_retry) &&
2029             (erp->status == DASD_CQR_NEED_ERP)) {
2030
2031                 dasd_3990_erp_compound_path(erp, sense);
2032         }
2033
2034         if ((erp->function == dasd_3990_erp_compound_path) &&
2035             (erp->status == DASD_CQR_NEED_ERP)) {
2036
2037                 erp = dasd_3990_erp_compound_code(erp, sense);
2038         }
2039
2040         if ((erp->function == dasd_3990_erp_compound_code) &&
2041             (erp->status == DASD_CQR_NEED_ERP)) {
2042
2043                 dasd_3990_erp_compound_config(erp, sense);
2044         }
2045
2046         /* if no compound action ERP specified, the request failed */
2047         if (erp->status == DASD_CQR_NEED_ERP)
2048                 erp->status = DASD_CQR_FAILED;
2049
2050         return erp;
2051
2052 }                               /* end dasd_3990_erp_compound */
2053
2054 /*
2055  *DASD_3990_ERP_HANDLE_SIM
2056  *
2057  *DESCRIPTION
2058  *  inspects the SIM SENSE data and starts an appropriate action
2059  *
2060  * PARAMETER
2061  *   sense         sense data of the actual error
2062  *
2063  * RETURN VALUES
2064  *   none
2065  */
2066 void
2067 dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense)
2068 {
2069         /* print message according to log or message to operator mode */
2070         if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) {
2071                 /* print SIM SRC from RefCode */
2072                 dev_err(&device->cdev->dev, "SIM - SRC: "
2073                             "%02x%02x%02x%02x\n", sense[22],
2074                             sense[23], sense[11], sense[12]);
2075         } else if (sense[24] & DASD_SIM_LOG) {
2076                 /* print SIM SRC Refcode */
2077                 dev_warn(&device->cdev->dev, "log SIM - SRC: "
2078                             "%02x%02x%02x%02x\n", sense[22],
2079                             sense[23], sense[11], sense[12]);
2080         }
2081 }
2082
2083 /*
2084  * DASD_3990_ERP_INSPECT_32
2085  *
2086  * DESCRIPTION
2087  *   Does a detailed inspection of the 32 byte sense data
2088  *   and sets up a related error recovery action.
2089  *
2090  * PARAMETER
2091  *   sense              sense data of the actual error
2092  *   erp                pointer to the currently created default ERP
2093  *
2094  * RETURN VALUES
2095  *   erp_filled         pointer to the ERP
2096  *
2097  */
2098 static struct dasd_ccw_req *
2099 dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
2100 {
2101
2102         struct dasd_device *device = erp->startdev;
2103
2104         erp->function = dasd_3990_erp_inspect_32;
2105
2106         /* check for SIM sense data */
2107         if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)
2108                 dasd_3990_erp_handle_sim(device, sense);
2109
2110         if (sense[25] & DASD_SENSE_BIT_0) {
2111
2112                 /* compound program action codes (byte25 bit 0 == '1') */
2113                 dasd_3990_erp_compound_retry(erp, sense);
2114
2115         } else {
2116
2117                 /* single program action codes (byte25 bit 0 == '0') */
2118                 switch (sense[25]) {
2119
2120                 case 0x00:      /* success - use default ERP for retries */
2121                         DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
2122                                     "ERP called for successful request"
2123                                     " - just retry");
2124                         break;
2125
2126                 case 0x01:      /* fatal error */
2127                         dev_err(&device->cdev->dev,
2128                                     "ERP failed for the DASD\n");
2129
2130                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2131                         break;
2132
2133                 case 0x02:      /* intervention required */
2134                 case 0x03:      /* intervention required during dual copy */
2135                         erp = dasd_3990_erp_int_req(erp);
2136                         break;
2137
2138                 case 0x0F:  /* length mismatch during update write command
2139                                internal error 08 - update write command error*/
2140                         dev_err(&device->cdev->dev, "An error occurred in the "
2141                                 "DASD device driver, reason=%s\n", "08");
2142
2143                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2144                         break;
2145
2146                 case 0x10:  /* logging required for other channel program */
2147                         erp = dasd_3990_erp_action_10_32(erp, sense);
2148                         break;
2149
2150                 case 0x15:      /* next track outside defined extend
2151                                    internal error 07 - The next track is not
2152                                    within the defined storage extent */
2153                         dev_err(&device->cdev->dev,
2154                                 "An error occurred in the DASD device driver, "
2155                                 "reason=%s\n", "07");
2156
2157                         erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2158                         break;
2159
2160                 case 0x1B:      /* unexpected condition during write */
2161
2162                         erp = dasd_3990_erp_action_1B_32(erp, sense);
2163                         break;
2164
2165                 case 0x1C:      /* invalid data */
2166                         dev_emerg(&device->cdev->dev,
2167                                     "Data recovered during retry with PCI "
2168                                     "fetch mode active\n");
2169
2170                         /* not possible to handle this situation in Linux */
2171                         panic
2172                             ("Invalid data - No way to inform application "
2173                              "about the possibly incorrect data");
2174                         break;
2175
2176                 case 0x1D:      /* state-change pending */
2177                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2178                                     "A State change pending condition exists "
2179                                     "for the subsystem or device");
2180
2181                         erp = dasd_3990_erp_action_4(erp, sense);
2182                         break;
2183
2184                 case 0x1E:      /* busy */
2185                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2186                                     "Busy condition exists "
2187                                     "for the subsystem or device");
2188                         erp = dasd_3990_erp_action_4(erp, sense);
2189                         break;
2190
2191                 default:        /* all others errors - default erp  */
2192                         break;
2193                 }
2194         }
2195
2196         return erp;
2197
2198 }                               /* end dasd_3990_erp_inspect_32 */
2199
2200 /*
2201  *****************************************************************************
2202  * main ERP control functions (24 and 32 byte sense)
2203  *****************************************************************************
2204  */
2205
2206 /*
2207  * DASD_3990_ERP_CONTROL_CHECK
2208  *
2209  * DESCRIPTION
2210  *   Does a generic inspection if a control check occured and sets up
2211  *   the related error recovery procedure
2212  *
2213  * PARAMETER
2214  *   erp                pointer to the currently created default ERP
2215  *
2216  * RETURN VALUES
2217  *   erp_filled         pointer to the erp
2218  */
2219
2220 static struct dasd_ccw_req *
2221 dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
2222 {
2223         struct dasd_device *device = erp->startdev;
2224
2225         if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK
2226                                            | SCHN_STAT_CHN_CTRL_CHK)) {
2227                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2228                             "channel or interface control check");
2229                 erp = dasd_3990_erp_action_4(erp, NULL);
2230         }
2231         return erp;
2232 }
2233
2234 /*
2235  * DASD_3990_ERP_INSPECT
2236  *
2237  * DESCRIPTION
2238  *   Does a detailed inspection for sense data by calling either
2239  *   the 24-byte or the 32-byte inspection routine.
2240  *
2241  * PARAMETER
2242  *   erp                pointer to the currently created default ERP
2243  * RETURN VALUES
2244  *   erp_new            contens was possibly modified
2245  */
2246 static struct dasd_ccw_req *
2247 dasd_3990_erp_inspect(struct dasd_ccw_req *erp)
2248 {
2249
2250         struct dasd_ccw_req *erp_new = NULL;
2251         char *sense;
2252
2253         /* if this problem occured on an alias retry on base */
2254         erp_new = dasd_3990_erp_inspect_alias(erp);
2255         if (erp_new)
2256                 return erp_new;
2257
2258         /* sense data are located in the refers record of the
2259          * already set up new ERP !
2260          * check if concurrent sens is available
2261          */
2262         sense = dasd_get_sense(&erp->refers->irb);
2263         if (!sense)
2264                 erp_new = dasd_3990_erp_control_check(erp);
2265         /* distinguish between 24 and 32 byte sense data */
2266         else if (sense[27] & DASD_SENSE_BIT_0) {
2267
2268                 /* inspect the 24 byte sense data */
2269                 erp_new = dasd_3990_erp_inspect_24(erp, sense);
2270
2271         } else {
2272
2273                 /* inspect the 32 byte sense data */
2274                 erp_new = dasd_3990_erp_inspect_32(erp, sense);
2275
2276         }       /* end distinguish between 24 and 32 byte sense data */
2277
2278         return erp_new;
2279 }
2280
2281 /*
2282  * DASD_3990_ERP_ADD_ERP
2283  *
2284  * DESCRIPTION
2285  *   This funtion adds an additional request block (ERP) to the head of
2286  *   the given cqr (or erp).
2287  *   For a command mode cqr the erp is initialized as an default erp
2288  *   (retry TIC).
2289  *   For transport mode we make a copy of the original TCW (points to
2290  *   the original TCCB, TIDALs, etc.) but give it a fresh
2291  *   TSB so the original sense data will not be changed.
2292  *
2293  * PARAMETER
2294  *   cqr                head of the current ERP-chain (or single cqr if
2295  *                      first error)
2296  * RETURN VALUES
2297  *   erp                pointer to new ERP-chain head
2298  */
2299 static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr)
2300 {
2301
2302         struct dasd_device *device = cqr->startdev;
2303         struct ccw1 *ccw;
2304         struct dasd_ccw_req *erp;
2305         int cplength, datasize;
2306         struct tcw *tcw;
2307         struct tsb *tsb;
2308
2309         if (cqr->cpmode == 1) {
2310                 cplength = 0;
2311                 /* TCW needs to be 64 byte aligned, so leave enough room */
2312                 datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb);
2313         } else {
2314                 cplength = 2;
2315                 datasize = 0;
2316         }
2317
2318         /* allocate additional request block */
2319         erp = dasd_alloc_erp_request((char *) &cqr->magic,
2320                                      cplength, datasize, device);
2321         if (IS_ERR(erp)) {
2322                 if (cqr->retries <= 0) {
2323                         DBF_DEV_EVENT(DBF_ERR, device, "%s",
2324                                     "Unable to allocate ERP request");
2325                         cqr->status = DASD_CQR_FAILED;
2326                         cqr->stopclk = get_clock ();
2327                 } else {
2328                         DBF_DEV_EVENT(DBF_ERR, device,
2329                                      "Unable to allocate ERP request "
2330                                      "(%i retries left)",
2331                                      cqr->retries);
2332                         dasd_block_set_timer(device->block, (HZ << 3));
2333                 }
2334                 return erp;
2335         }
2336
2337         ccw = cqr->cpaddr;
2338         if (cqr->cpmode == 1) {
2339                 /* make a shallow copy of the original tcw but set new tsb */
2340                 erp->cpmode = 1;
2341                 erp->cpaddr = PTR_ALIGN(erp->data, 64);
2342                 tcw = erp->cpaddr;
2343                 tsb = (struct tsb *) &tcw[1];
2344                 *tcw = *((struct tcw *)cqr->cpaddr);
2345                 tcw->tsb = (long)tsb;
2346         } else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) {
2347                 /* PSF cannot be chained from NOOP/TIC */
2348                 erp->cpaddr = cqr->cpaddr;
2349         } else {
2350                 /* initialize request with default TIC to current ERP/CQR */
2351                 ccw = erp->cpaddr;
2352                 ccw->cmd_code = CCW_CMD_NOOP;
2353                 ccw->flags = CCW_FLAG_CC;
2354                 ccw++;
2355                 ccw->cmd_code = CCW_CMD_TIC;
2356                 ccw->cda      = (long)(cqr->cpaddr);
2357         }
2358
2359         erp->flags = cqr->flags;
2360         erp->function = dasd_3990_erp_add_erp;
2361         erp->refers   = cqr;
2362         erp->startdev = device;
2363         erp->memdev   = device;
2364         erp->block    = cqr->block;
2365         erp->magic    = cqr->magic;
2366         erp->expires  = 0;
2367         erp->retries  = 256;
2368         erp->buildclk = get_clock();
2369         erp->status = DASD_CQR_FILLED;
2370
2371         return erp;
2372 }
2373
2374 /*
2375  * DASD_3990_ERP_ADDITIONAL_ERP
2376  *
2377  * DESCRIPTION
2378  *   An additional ERP is needed to handle the current error.
2379  *   Add ERP to the head of the ERP-chain containing the ERP processing
2380  *   determined based on the sense data.
2381  *
2382  * PARAMETER
2383  *   cqr                head of the current ERP-chain (or single cqr if
2384  *                      first error)
2385  *
2386  * RETURN VALUES
2387  *   erp                pointer to new ERP-chain head
2388  */
2389 static struct dasd_ccw_req *
2390 dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr)
2391 {
2392
2393         struct dasd_ccw_req *erp = NULL;
2394
2395         /* add erp and initialize with default TIC */
2396         erp = dasd_3990_erp_add_erp(cqr);
2397
2398         if (IS_ERR(erp))
2399                 return erp;
2400
2401         /* inspect sense, determine specific ERP if possible */
2402         if (erp != cqr) {
2403
2404                 erp = dasd_3990_erp_inspect(erp);
2405         }
2406
2407         return erp;
2408
2409 }                               /* end dasd_3990_erp_additional_erp */
2410
2411 /*
2412  * DASD_3990_ERP_ERROR_MATCH
2413  *
2414  * DESCRIPTION
2415  *   Check if the device status of the given cqr is the same.
2416  *   This means that the failed CCW and the relevant sense data
2417  *   must match.
2418  *   I don't distinguish between 24 and 32 byte sense because in case of
2419  *   24 byte sense byte 25 and 27 is set as well.
2420  *
2421  * PARAMETER
2422  *   cqr1               first cqr, which will be compared with the
2423  *   cqr2               second cqr.
2424  *
2425  * RETURN VALUES
2426  *   match              'boolean' for match found
2427  *                      returns 1 if match found, otherwise 0.
2428  */
2429 static int dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1,
2430                                      struct dasd_ccw_req *cqr2)
2431 {
2432         char *sense1, *sense2;
2433
2434         if (cqr1->startdev != cqr2->startdev)
2435                 return 0;
2436
2437         sense1 = dasd_get_sense(&cqr1->irb);
2438         sense2 = dasd_get_sense(&cqr2->irb);
2439
2440         /* one request has sense data, the other not -> no match, return 0 */
2441         if (!sense1 != !sense2)
2442                 return 0;
2443         /* no sense data in both cases -> check cstat for IFCC */
2444         if (!sense1 && !sense2) {
2445                 if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2446                                                     SCHN_STAT_CHN_CTRL_CHK)) ==
2447                     (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2448                                                     SCHN_STAT_CHN_CTRL_CHK)))
2449                         return 1; /* match with ifcc*/
2450         }
2451         /* check sense data; byte 0-2,25,27 */
2452         if (!(sense1 && sense2 &&
2453               (memcmp(sense1, sense2, 3) == 0) &&
2454               (sense1[27] == sense2[27]) &&
2455               (sense1[25] == sense2[25]))) {
2456
2457                 return 0;       /* sense doesn't match */
2458         }
2459
2460         return 1;               /* match */
2461
2462 }                               /* end dasd_3990_erp_error_match */
2463
2464 /*
2465  * DASD_3990_ERP_IN_ERP
2466  *
2467  * DESCRIPTION
2468  *   check if the current error already happened before.
2469  *   quick exit if current cqr is not an ERP (cqr->refers=NULL)
2470  *
2471  * PARAMETER
2472  *   cqr                failed cqr (either original cqr or already an erp)
2473  *
2474  * RETURN VALUES
2475  *   erp                erp-pointer to the already defined error
2476  *                      recovery procedure OR
2477  *                      NULL if a 'new' error occurred.
2478  */
2479 static struct dasd_ccw_req *
2480 dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr)
2481 {
2482
2483         struct dasd_ccw_req *erp_head = cqr,    /* save erp chain head */
2484         *erp_match = NULL;      /* save erp chain head */
2485         int match = 0;          /* 'boolean' for matching error found */
2486
2487         if (cqr->refers == NULL) {      /* return if not in erp */
2488                 return NULL;
2489         }
2490
2491         /* check the erp/cqr chain for current error */
2492         do {
2493                 match = dasd_3990_erp_error_match(erp_head, cqr->refers);
2494                 erp_match = cqr;        /* save possible matching erp  */
2495                 cqr = cqr->refers;      /* check next erp/cqr in queue */
2496
2497         } while ((cqr->refers != NULL) && (!match));
2498
2499         if (!match) {
2500                 return NULL;    /* no match was found */
2501         }
2502
2503         return erp_match;       /* return address of matching erp */
2504
2505 }                               /* END dasd_3990_erp_in_erp */
2506
2507 /*
2508  * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
2509  *
2510  * DESCRIPTION
2511  *   No retry is left for the current ERP. Check what has to be done
2512  *   with the ERP.
2513  *     - do further defined ERP action or
2514  *     - wait for interrupt or
2515  *     - exit with permanent error
2516  *
2517  * PARAMETER
2518  *   erp                ERP which is in progress with no retry left
2519  *
2520  * RETURN VALUES
2521  *   erp                modified/additional ERP
2522  */
2523 static struct dasd_ccw_req *
2524 dasd_3990_erp_further_erp(struct dasd_ccw_req *erp)
2525 {
2526
2527         struct dasd_device *device = erp->startdev;
2528         char *sense = dasd_get_sense(&erp->irb);
2529
2530         /* check for 24 byte sense ERP */
2531         if ((erp->function == dasd_3990_erp_bus_out) ||
2532             (erp->function == dasd_3990_erp_action_1) ||
2533             (erp->function == dasd_3990_erp_action_4)) {
2534
2535                 erp = dasd_3990_erp_action_1(erp);
2536
2537         } else if (erp->function == dasd_3990_erp_action_1_sec) {
2538                 erp = dasd_3990_erp_action_1_sec(erp);
2539         } else if (erp->function == dasd_3990_erp_action_5) {
2540
2541                 /* retries have not been successful */
2542                 /* prepare erp for retry on different channel path */
2543                 erp = dasd_3990_erp_action_1(erp);
2544
2545                 if (sense && !(sense[2] & DASD_SENSE_BIT_0)) {
2546
2547                         /* issue a Diagnostic Control command with an
2548                          * Inhibit Write subcommand */
2549
2550                         switch (sense[25]) {
2551                         case 0x17:
2552                         case 0x57:{     /* controller */
2553                                         erp = dasd_3990_erp_DCTL(erp, 0x20);
2554                                         break;
2555                                 }
2556                         case 0x18:
2557                         case 0x58:{     /* channel path */
2558                                         erp = dasd_3990_erp_DCTL(erp, 0x40);
2559                                         break;
2560                                 }
2561                         case 0x19:
2562                         case 0x59:{     /* storage director */
2563                                         erp = dasd_3990_erp_DCTL(erp, 0x80);
2564                                         break;
2565                                 }
2566                         default:
2567                                 DBF_DEV_EVENT(DBF_WARNING, device,
2568                                             "invalid subcommand modifier 0x%x "
2569                                             "for Diagnostic Control Command",
2570                                             sense[25]);
2571                         }
2572                 }
2573
2574                 /* check for 32 byte sense ERP */
2575         } else if (sense &&
2576                    ((erp->function == dasd_3990_erp_compound_retry) ||
2577                     (erp->function == dasd_3990_erp_compound_path) ||
2578                     (erp->function == dasd_3990_erp_compound_code) ||
2579                     (erp->function == dasd_3990_erp_compound_config))) {
2580
2581                 erp = dasd_3990_erp_compound(erp, sense);
2582
2583         } else {
2584                 /*
2585                  * No retry left and no additional special handling
2586                  * necessary
2587                  */
2588                 dev_err(&device->cdev->dev,
2589                         "ERP %p has run out of retries and failed\n", erp);
2590
2591                 erp->status = DASD_CQR_FAILED;
2592         }
2593
2594         return erp;
2595
2596 }                               /* end dasd_3990_erp_further_erp */
2597
2598 /*
2599  * DASD_3990_ERP_HANDLE_MATCH_ERP
2600  *
2601  * DESCRIPTION
2602  *   An error occurred again and an ERP has been detected which is already
2603  *   used to handle this error (e.g. retries).
2604  *   All prior ERP's are asumed to be successful and therefore removed
2605  *   from queue.
2606  *   If retry counter of matching erp is already 0, it is checked if further
2607  *   action is needed (besides retry) or if the ERP has failed.
2608  *
2609  * PARAMETER
2610  *   erp_head           first ERP in ERP-chain
2611  *   erp                ERP that handles the actual error.
2612  *                      (matching erp)
2613  *
2614  * RETURN VALUES
2615  *   erp                modified/additional ERP
2616  */
2617 static struct dasd_ccw_req *
2618 dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head,
2619                                struct dasd_ccw_req *erp)
2620 {
2621
2622         struct dasd_device *device = erp_head->startdev;
2623         struct dasd_ccw_req *erp_done = erp_head;       /* finished req */
2624         struct dasd_ccw_req *erp_free = NULL;   /* req to be freed */
2625
2626         /* loop over successful ERPs and remove them from chanq */
2627         while (erp_done != erp) {
2628
2629                 if (erp_done == NULL)   /* end of chain reached */
2630                         panic(PRINTK_HEADER "Programming error in ERP! The "
2631                               "original request was lost\n");
2632
2633                 /* remove the request from the device queue */
2634                 list_del(&erp_done->blocklist);
2635
2636                 erp_free = erp_done;
2637                 erp_done = erp_done->refers;
2638
2639                 /* free the finished erp request */
2640                 dasd_free_erp_request(erp_free, erp_free->memdev);
2641
2642         }                       /* end while */
2643
2644         if (erp->retries > 0) {
2645
2646                 char *sense = dasd_get_sense(&erp->refers->irb);
2647
2648                 /* check for special retries */
2649                 if (sense && erp->function == dasd_3990_erp_action_4) {
2650
2651                         erp = dasd_3990_erp_action_4(erp, sense);
2652
2653                 } else if (sense &&
2654                            erp->function == dasd_3990_erp_action_1B_32) {
2655
2656                         erp = dasd_3990_update_1B(erp, sense);
2657
2658                 } else if (sense && erp->function == dasd_3990_erp_int_req) {
2659
2660                         erp = dasd_3990_erp_int_req(erp);
2661
2662                 } else {
2663                         /* simple retry   */
2664                         DBF_DEV_EVENT(DBF_DEBUG, device,
2665                                     "%i retries left for erp %p",
2666                                     erp->retries, erp);
2667
2668                         /* handle the request again... */
2669                         erp->status = DASD_CQR_FILLED;
2670                 }
2671
2672         } else {
2673                 /* no retry left - check for further necessary action    */
2674                 /* if no further actions, handle rest as permanent error */
2675                 erp = dasd_3990_erp_further_erp(erp);
2676         }
2677
2678         return erp;
2679
2680 }                               /* end dasd_3990_erp_handle_match_erp */
2681
2682 /*
2683  * DASD_3990_ERP_ACTION
2684  *
2685  * DESCRIPTION
2686  *   control routine for 3990 erp actions.
2687  *   Has to be called with the queue lock (namely the s390_irq_lock) acquired.
2688  *
2689  * PARAMETER
2690  *   cqr                failed cqr (either original cqr or already an erp)
2691  *
2692  * RETURN VALUES
2693  *   erp                erp-pointer to the head of the ERP action chain.
2694  *                      This means:
2695  *                       - either a ptr to an additional ERP cqr or
2696  *                       - the original given cqr (which's status might
2697  *                         be modified)
2698  */
2699 struct dasd_ccw_req *
2700 dasd_3990_erp_action(struct dasd_ccw_req * cqr)
2701 {
2702         struct dasd_ccw_req *erp = NULL;
2703         struct dasd_device *device = cqr->startdev;
2704         struct dasd_ccw_req *temp_erp = NULL;
2705
2706         if (device->features & DASD_FEATURE_ERPLOG) {
2707                 /* print current erp_chain */
2708                 dev_err(&device->cdev->dev,
2709                             "ERP chain at BEGINNING of ERP-ACTION\n");
2710                 for (temp_erp = cqr;
2711                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2712
2713                         dev_err(&device->cdev->dev,
2714                                     "ERP %p (%02x) refers to %p\n",
2715                                     temp_erp, temp_erp->status,
2716                                     temp_erp->refers);
2717                 }
2718         }
2719
2720         /* double-check if current erp/cqr was successful */
2721         if ((scsw_cstat(&cqr->irb.scsw) == 0x00) &&
2722             (scsw_dstat(&cqr->irb.scsw) ==
2723              (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
2724
2725                 DBF_DEV_EVENT(DBF_DEBUG, device,
2726                             "ERP called for successful request %p"
2727                             " - NO ERP necessary", cqr);
2728
2729                 cqr->status = DASD_CQR_DONE;
2730
2731                 return cqr;
2732         }
2733
2734         /* check if error happened before */
2735         erp = dasd_3990_erp_in_erp(cqr);
2736
2737         if (erp == NULL) {
2738                 /* no matching erp found - set up erp */
2739                 erp = dasd_3990_erp_additional_erp(cqr);
2740                 if (IS_ERR(erp))
2741                         return erp;
2742         } else {
2743                 /* matching erp found - set all leading erp's to DONE */
2744                 erp = dasd_3990_erp_handle_match_erp(cqr, erp);
2745         }
2746
2747         if (device->features & DASD_FEATURE_ERPLOG) {
2748                 /* print current erp_chain */
2749                 dev_err(&device->cdev->dev,
2750                             "ERP chain at END of ERP-ACTION\n");
2751                 for (temp_erp = erp;
2752                      temp_erp != NULL; temp_erp = temp_erp->refers) {
2753
2754                         dev_err(&device->cdev->dev,
2755                                     "ERP %p (%02x) refers to %p\n",
2756                                     temp_erp, temp_erp->status,
2757                                     temp_erp->refers);
2758                 }
2759         }
2760
2761         /* enqueue ERP request if it's a new one */
2762         if (list_empty(&erp->blocklist)) {
2763                 cqr->status = DASD_CQR_IN_ERP;
2764                 /* add erp request before the cqr */
2765                 list_add_tail(&erp->blocklist, &cqr->blocklist);
2766         }
2767
2768
2769
2770         return erp;
2771
2772 }                               /* end dasd_3990_erp_action */