1 // SPDX-License-Identifier: GPL-2.0
2 /*
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  * Copyright IBM Corp. 2000, 2001
7  *
8  */
9 
10 #define KMSG_COMPONENT "dasd-eckd"
11 
12 #include <linux/timer.h>
13 #include <asm/idals.h>
14 
15 #define PRINTK_HEADER "dasd_erp(3990): "
16 
17 #include "dasd_int.h"
18 #include "dasd_eckd.h"
19 
20 
21 struct DCTL_data {
22 	unsigned char subcommand;  /* e.g Inhibit Write, Enable Write,... */
23 	unsigned char modifier;	   /* Subcommand modifier */
24 	unsigned short res;	   /* reserved */
25 } __attribute__ ((packed));
26 
27 /*
28  *****************************************************************************
29  * SECTION ERP HANDLING
30  *****************************************************************************
31  */
32 /*
33  *****************************************************************************
34  * 24 and 32 byte sense ERP functions
35  *****************************************************************************
36  */
37 
38 /*
39  * DASD_3990_ERP_CLEANUP
40  *
41  * DESCRIPTION
42  *   Removes the already build but not necessary ERP request and sets
43  *   the status of the original cqr / erp to the given (final) status
44  *
45  *  PARAMETER
46  *   erp		request to be blocked
47  *   final_status	either DASD_CQR_DONE or DASD_CQR_FAILED
48  *
49  * RETURN VALUES
50  *   cqr		original cqr
51  */
52 static struct dasd_ccw_req *
53 dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status)
54 {
55 	struct dasd_ccw_req *cqr = erp->refers;
56 
57 	dasd_free_erp_request(erp, erp->memdev);
58 	cqr->status = final_status;
59 	return cqr;
60 
61 }				/* end dasd_3990_erp_cleanup */
62 
63 /*
64  * DASD_3990_ERP_BLOCK_QUEUE
65  *
66  * DESCRIPTION
67  *   Block the given device request queue to prevent from further
68  *   processing until the started timer has expired or an related
69  *   interrupt was received.
70  */
71 static void dasd_3990_erp_block_queue(struct dasd_ccw_req *erp, int expires)
72 {
73 
74 	struct dasd_device *device = erp->startdev;
75 	unsigned long flags;
76 
77 	DBF_DEV_EVENT(DBF_INFO, device,
78 		    "blocking request queue for %is", expires/HZ);
79 
80 	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
81 	dasd_device_set_stop_bits(device, DASD_STOPPED_PENDING);
82 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
83 	erp->status = DASD_CQR_FILLED;
84 	if (erp->block)
85 		dasd_block_set_timer(erp->block, expires);
86 	else
87 		dasd_device_set_timer(device, expires);
88 }
89 
90 /*
91  * DASD_3990_ERP_INT_REQ
92  *
93  * DESCRIPTION
94  *   Handles 'Intervention Required' error.
95  *   This means either device offline or not installed.
96  *
97  * PARAMETER
98  *   erp		current erp
99  * RETURN VALUES
100  *   erp		modified erp
101  */
102 static struct dasd_ccw_req *
103 dasd_3990_erp_int_req(struct dasd_ccw_req * erp)
104 {
105 
106 	struct dasd_device *device = erp->startdev;
107 
108 	/* first time set initial retry counter and erp_function */
109 	/* and retry once without blocking queue		 */
110 	/* (this enables easier enqueing of the cqr)		 */
111 	if (erp->function != dasd_3990_erp_int_req) {
112 
113 		erp->retries = 256;
114 		erp->function = dasd_3990_erp_int_req;
115 
116 	} else {
117 
118 		/* issue a message and wait for 'device ready' interrupt */
119 		dev_err(&device->cdev->dev,
120 			    "is offline or not installed - "
121 			    "INTERVENTION REQUIRED!!\n");
122 
123 		dasd_3990_erp_block_queue(erp, 60*HZ);
124 	}
125 
126 	return erp;
127 
128 }				/* end dasd_3990_erp_int_req */
129 
130 /*
131  * DASD_3990_ERP_ALTERNATE_PATH
132  *
133  * DESCRIPTION
134  *   Repeat the operation on a different channel path.
135  *   If all alternate paths have been tried, the request is posted with a
136  *   permanent error.
137  *
138  *  PARAMETER
139  *   erp		pointer to the current ERP
140  *
141  * RETURN VALUES
142  *   erp		modified pointer to the ERP
143  */
144 static void
145 dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
146 {
147 	struct dasd_device *device = erp->startdev;
148 	__u8 opm;
149 	unsigned long flags;
150 
151 	/* try alternate valid path */
152 	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
153 	opm = ccw_device_get_path_mask(device->cdev);
154 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
155 	if (erp->lpm == 0)
156 		erp->lpm = dasd_path_get_opm(device) &
157 			~(erp->irb.esw.esw0.sublog.lpum);
158 	else
159 		erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
160 
161 	if ((erp->lpm & opm) != 0x00) {
162 
163 		DBF_DEV_EVENT(DBF_WARNING, device,
164 			    "try alternate lpm=%x (lpum=%x / opm=%x)",
165 			    erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm);
166 
167 		/* reset status to submit the request again... */
168 		erp->status = DASD_CQR_FILLED;
169 		erp->retries = 10;
170 	} else {
171 		dev_err(&device->cdev->dev,
172 			"The DASD cannot be reached on any path (lpum=%x"
173 			"/opm=%x)\n", erp->irb.esw.esw0.sublog.lpum, opm);
174 
175 		/* post request with permanent error */
176 		erp->status = DASD_CQR_FAILED;
177 	}
178 }				/* end dasd_3990_erp_alternate_path */
179 
180 /*
181  * DASD_3990_ERP_DCTL
182  *
183  * DESCRIPTION
184  *   Setup cqr to do the Diagnostic Control (DCTL) command with an
185  *   Inhibit Write subcommand (0x20) and the given modifier.
186  *
187  *  PARAMETER
188  *   erp		pointer to the current (failed) ERP
189  *   modifier		subcommand modifier
190  *
191  * RETURN VALUES
192  *   dctl_cqr		pointer to NEW dctl_cqr
193  *
194  */
195 static struct dasd_ccw_req *
196 dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier)
197 {
198 
199 	struct dasd_device *device = erp->startdev;
200 	struct DCTL_data *DCTL_data;
201 	struct ccw1 *ccw;
202 	struct dasd_ccw_req *dctl_cqr;
203 
204 	dctl_cqr = dasd_alloc_erp_request(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_tod_clock();
234 
235 	dctl_cqr->status = DASD_CQR_FILLED;
236 
237 	return dctl_cqr;
238 
239 }				/* end dasd_3990_erp_DCTL */
240 
241 /*
242  * DASD_3990_ERP_ACTION_1
243  *
244  * DESCRIPTION
245  *   Setup ERP to do the ERP action 1 (see Reference manual).
246  *   Repeat the operation on a different channel path.
247  *   As deviation from the recommended recovery action, we reset the path mask
248  *   after we have tried each path and go through all paths a second time.
249  *   This will cover situations where only one path at a time is actually down,
250  *   but all paths fail and recover just with the same sequence and timing as
251  *   we try to use them (flapping links).
252  *   If all alternate paths have been tried twice, the request is posted with
253  *   a permanent error.
254  *
255  *  PARAMETER
256  *   erp		pointer to the current ERP
257  *
258  * RETURN VALUES
259  *   erp		pointer to the ERP
260  *
261  */
262 static struct dasd_ccw_req *dasd_3990_erp_action_1_sec(struct dasd_ccw_req *erp)
263 {
264 	erp->function = dasd_3990_erp_action_1_sec;
265 	dasd_3990_erp_alternate_path(erp);
266 	return erp;
267 }
268 
269 static struct dasd_ccw_req *dasd_3990_erp_action_1(struct dasd_ccw_req *erp)
270 {
271 	erp->function = dasd_3990_erp_action_1;
272 	dasd_3990_erp_alternate_path(erp);
273 	if (erp->status == DASD_CQR_FAILED &&
274 	    !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
275 		erp->status = DASD_CQR_FILLED;
276 		erp->retries = 10;
277 		erp->lpm = dasd_path_get_opm(erp->startdev);
278 		erp->function = dasd_3990_erp_action_1_sec;
279 	}
280 	return erp;
281 }				/* end dasd_3990_erp_action_1(b) */
282 
283 /*
284  * DASD_3990_ERP_ACTION_4
285  *
286  * DESCRIPTION
287  *   Setup ERP to do the ERP action 4 (see Reference manual).
288  *   Set the current request to PENDING to block the CQR queue for that device
289  *   until the state change interrupt appears.
290  *   Use a timer (20 seconds) to retry the cqr if the interrupt is still
291  *   missing.
292  *
293  *  PARAMETER
294  *   sense		sense data of the actual error
295  *   erp		pointer to the current ERP
296  *
297  * RETURN VALUES
298  *   erp		pointer to the ERP
299  *
300  */
301 static struct dasd_ccw_req *
302 dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense)
303 {
304 
305 	struct dasd_device *device = erp->startdev;
306 
307 	/* first time set initial retry counter and erp_function    */
308 	/* and retry once without waiting for state change pending  */
309 	/* interrupt (this enables easier enqueing of the cqr)	    */
310 	if (erp->function != dasd_3990_erp_action_4) {
311 
312 		DBF_DEV_EVENT(DBF_INFO, device, "%s",
313 			    "dasd_3990_erp_action_4: first time retry");
314 
315 		erp->retries = 256;
316 		erp->function = dasd_3990_erp_action_4;
317 
318 	} else {
319 		if (sense && (sense[25] == 0x1D)) { /* state change pending */
320 
321 			DBF_DEV_EVENT(DBF_INFO, device,
322 				    "waiting for state change pending "
323 				    "interrupt, %d retries left",
324 				    erp->retries);
325 
326 			dasd_3990_erp_block_queue(erp, 30*HZ);
327 
328 		} else if (sense && (sense[25] == 0x1E)) {	/* busy */
329 			DBF_DEV_EVENT(DBF_INFO, device,
330 				    "busy - redriving request later, "
331 				    "%d retries left",
332 				    erp->retries);
333                         dasd_3990_erp_block_queue(erp, HZ);
334 		} else {
335 			/* no state change pending - retry */
336 			DBF_DEV_EVENT(DBF_INFO, device,
337 				     "redriving request immediately, "
338 				     "%d retries left",
339 				     erp->retries);
340 			erp->status = DASD_CQR_FILLED;
341 		}
342 	}
343 
344 	return erp;
345 
346 }				/* end dasd_3990_erp_action_4 */
347 
348 /*
349  *****************************************************************************
350  * 24 byte sense ERP functions (only)
351  *****************************************************************************
352  */
353 
354 /*
355  * DASD_3990_ERP_ACTION_5
356  *
357  * DESCRIPTION
358  *   Setup ERP to do the ERP action 5 (see Reference manual).
359  *   NOTE: Further handling is done in xxx_further_erp after the retries.
360  *
361  *  PARAMETER
362  *   erp		pointer to the current ERP
363  *
364  * RETURN VALUES
365  *   erp		pointer to the ERP
366  *
367  */
368 static struct dasd_ccw_req *
369 dasd_3990_erp_action_5(struct dasd_ccw_req * erp)
370 {
371 
372 	/* first of all retry */
373 	erp->retries = 10;
374 	erp->function = dasd_3990_erp_action_5;
375 
376 	return erp;
377 
378 }				/* end dasd_3990_erp_action_5 */
379 
380 /*
381  * DASD_3990_HANDLE_ENV_DATA
382  *
383  * DESCRIPTION
384  *   Handles 24 byte 'Environmental data present'.
385  *   Does a analysis of the sense data (message Format)
386  *   and prints the error messages.
387  *
388  * PARAMETER
389  *   sense		current sense data
390  *
391  * RETURN VALUES
392  *   void
393  */
394 static void
395 dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense)
396 {
397 
398 	struct dasd_device *device = erp->startdev;
399 	char msg_format = (sense[7] & 0xF0);
400 	char msg_no = (sense[7] & 0x0F);
401 	char errorstring[ERRORLENGTH];
402 
403 	switch (msg_format) {
404 	case 0x00:		/* Format 0 - Program or System Checks */
405 
406 		if (sense[1] & 0x10) {	/* check message to operator bit */
407 
408 			switch (msg_no) {
409 			case 0x00:	/* No Message */
410 				break;
411 			case 0x01:
412 				dev_warn(&device->cdev->dev,
413 					    "FORMAT 0 - Invalid Command\n");
414 				break;
415 			case 0x02:
416 				dev_warn(&device->cdev->dev,
417 					    "FORMAT 0 - Invalid Command "
418 					    "Sequence\n");
419 				break;
420 			case 0x03:
421 				dev_warn(&device->cdev->dev,
422 					    "FORMAT 0 - CCW Count less than "
423 					    "required\n");
424 				break;
425 			case 0x04:
426 				dev_warn(&device->cdev->dev,
427 					    "FORMAT 0 - Invalid Parameter\n");
428 				break;
429 			case 0x05:
430 				dev_warn(&device->cdev->dev,
431 					    "FORMAT 0 - Diagnostic of Special"
432 					    " Command Violates File Mask\n");
433 				break;
434 			case 0x07:
435 				dev_warn(&device->cdev->dev,
436 					    "FORMAT 0 - Channel Returned with "
437 					    "Incorrect retry CCW\n");
438 				break;
439 			case 0x08:
440 				dev_warn(&device->cdev->dev,
441 					    "FORMAT 0 - Reset Notification\n");
442 				break;
443 			case 0x09:
444 				dev_warn(&device->cdev->dev,
445 					 "FORMAT 0 - Storage Path Restart\n");
446 				break;
447 			case 0x0A:
448 				dev_warn(&device->cdev->dev,
449 					    "FORMAT 0 - Channel requested "
450 					    "... %02x\n", sense[8]);
451 				break;
452 			case 0x0B:
453 				dev_warn(&device->cdev->dev,
454 					    "FORMAT 0 - Invalid Defective/"
455 					    "Alternate Track Pointer\n");
456 				break;
457 			case 0x0C:
458 				dev_warn(&device->cdev->dev,
459 					    "FORMAT 0 - DPS Installation "
460 					    "Check\n");
461 				break;
462 			case 0x0E:
463 				dev_warn(&device->cdev->dev,
464 					    "FORMAT 0 - Command Invalid on "
465 					    "Secondary Address\n");
466 				break;
467 			case 0x0F:
468 				dev_warn(&device->cdev->dev,
469 					    "FORMAT 0 - Status Not As "
470 					    "Required: reason %02x\n",
471 					 sense[8]);
472 				break;
473 			default:
474 				dev_warn(&device->cdev->dev,
475 					    "FORMAT 0 - Reserved\n");
476 			}
477 		} else {
478 			switch (msg_no) {
479 			case 0x00:	/* No Message */
480 				break;
481 			case 0x01:
482 				dev_warn(&device->cdev->dev,
483 					 "FORMAT 0 - Device Error "
484 					 "Source\n");
485 				break;
486 			case 0x02:
487 				dev_warn(&device->cdev->dev,
488 					    "FORMAT 0 - Reserved\n");
489 				break;
490 			case 0x03:
491 				dev_warn(&device->cdev->dev,
492 					    "FORMAT 0 - Device Fenced - "
493 					    "device = %02x\n", sense[4]);
494 				break;
495 			case 0x04:
496 				dev_warn(&device->cdev->dev,
497 					    "FORMAT 0 - Data Pinned for "
498 					    "Device\n");
499 				break;
500 			default:
501 				dev_warn(&device->cdev->dev,
502 					    "FORMAT 0 - Reserved\n");
503 			}
504 		}
505 		break;
506 
507 	case 0x10:		/* Format 1 - Device Equipment Checks */
508 		switch (msg_no) {
509 		case 0x00:	/* No Message */
510 			break;
511 		case 0x01:
512 			dev_warn(&device->cdev->dev,
513 				    "FORMAT 1 - Device Status 1 not as "
514 				    "expected\n");
515 			break;
516 		case 0x03:
517 			dev_warn(&device->cdev->dev,
518 				    "FORMAT 1 - Index missing\n");
519 			break;
520 		case 0x04:
521 			dev_warn(&device->cdev->dev,
522 				 "FORMAT 1 - Interruption cannot be "
523 				 "reset\n");
524 			break;
525 		case 0x05:
526 			dev_warn(&device->cdev->dev,
527 				    "FORMAT 1 - Device did not respond to "
528 				    "selection\n");
529 			break;
530 		case 0x06:
531 			dev_warn(&device->cdev->dev,
532 				    "FORMAT 1 - Device check-2 error or Set "
533 				    "Sector is not complete\n");
534 			break;
535 		case 0x07:
536 			dev_warn(&device->cdev->dev,
537 				    "FORMAT 1 - Head address does not "
538 				    "compare\n");
539 			break;
540 		case 0x08:
541 			dev_warn(&device->cdev->dev,
542 				    "FORMAT 1 - Device status 1 not valid\n");
543 			break;
544 		case 0x09:
545 			dev_warn(&device->cdev->dev,
546 				    "FORMAT 1 - Device not ready\n");
547 			break;
548 		case 0x0A:
549 			dev_warn(&device->cdev->dev,
550 				    "FORMAT 1 - Track physical address did "
551 				    "not compare\n");
552 			break;
553 		case 0x0B:
554 			dev_warn(&device->cdev->dev,
555 				    "FORMAT 1 - Missing device address bit\n");
556 			break;
557 		case 0x0C:
558 			dev_warn(&device->cdev->dev,
559 				    "FORMAT 1 - Drive motor switch is off\n");
560 			break;
561 		case 0x0D:
562 			dev_warn(&device->cdev->dev,
563 				    "FORMAT 1 - Seek incomplete\n");
564 			break;
565 		case 0x0E:
566 			dev_warn(&device->cdev->dev,
567 				    "FORMAT 1 - Cylinder address did not "
568 				    "compare\n");
569 			break;
570 		case 0x0F:
571 			dev_warn(&device->cdev->dev,
572 				    "FORMAT 1 - Offset active cannot be "
573 				    "reset\n");
574 			break;
575 		default:
576 			dev_warn(&device->cdev->dev,
577 				    "FORMAT 1 - Reserved\n");
578 		}
579 		break;
580 
581 	case 0x20:		/* Format 2 - 3990 Equipment Checks */
582 		switch (msg_no) {
583 		case 0x08:
584 			dev_warn(&device->cdev->dev,
585 				    "FORMAT 2 - 3990 check-2 error\n");
586 			break;
587 		case 0x0E:
588 			dev_warn(&device->cdev->dev,
589 				    "FORMAT 2 - Support facility errors\n");
590 			break;
591 		case 0x0F:
592 			dev_warn(&device->cdev->dev,
593 				 "FORMAT 2 - Microcode detected error "
594 				 "%02x\n",
595 				 sense[8]);
596 			break;
597 		default:
598 			dev_warn(&device->cdev->dev,
599 				    "FORMAT 2 - Reserved\n");
600 		}
601 		break;
602 
603 	case 0x30:		/* Format 3 - 3990 Control Checks */
604 		switch (msg_no) {
605 		case 0x0F:
606 			dev_warn(&device->cdev->dev,
607 				    "FORMAT 3 - Allegiance terminated\n");
608 			break;
609 		default:
610 			dev_warn(&device->cdev->dev,
611 				    "FORMAT 3 - Reserved\n");
612 		}
613 		break;
614 
615 	case 0x40:		/* Format 4 - Data Checks */
616 		switch (msg_no) {
617 		case 0x00:
618 			dev_warn(&device->cdev->dev,
619 				    "FORMAT 4 - Home address area error\n");
620 			break;
621 		case 0x01:
622 			dev_warn(&device->cdev->dev,
623 				    "FORMAT 4 - Count area error\n");
624 			break;
625 		case 0x02:
626 			dev_warn(&device->cdev->dev,
627 				    "FORMAT 4 - Key area error\n");
628 			break;
629 		case 0x03:
630 			dev_warn(&device->cdev->dev,
631 				    "FORMAT 4 - Data area error\n");
632 			break;
633 		case 0x04:
634 			dev_warn(&device->cdev->dev,
635 				    "FORMAT 4 - No sync byte in home address "
636 				    "area\n");
637 			break;
638 		case 0x05:
639 			dev_warn(&device->cdev->dev,
640 				    "FORMAT 4 - No sync byte in count address "
641 				    "area\n");
642 			break;
643 		case 0x06:
644 			dev_warn(&device->cdev->dev,
645 				    "FORMAT 4 - No sync byte in key area\n");
646 			break;
647 		case 0x07:
648 			dev_warn(&device->cdev->dev,
649 				    "FORMAT 4 - No sync byte in data area\n");
650 			break;
651 		case 0x08:
652 			dev_warn(&device->cdev->dev,
653 				    "FORMAT 4 - Home address area error; "
654 				    "offset active\n");
655 			break;
656 		case 0x09:
657 			dev_warn(&device->cdev->dev,
658 				    "FORMAT 4 - Count area error; offset "
659 				    "active\n");
660 			break;
661 		case 0x0A:
662 			dev_warn(&device->cdev->dev,
663 				    "FORMAT 4 - Key area error; offset "
664 				    "active\n");
665 			break;
666 		case 0x0B:
667 			dev_warn(&device->cdev->dev,
668 				    "FORMAT 4 - Data area error; "
669 				    "offset active\n");
670 			break;
671 		case 0x0C:
672 			dev_warn(&device->cdev->dev,
673 				    "FORMAT 4 - No sync byte in home "
674 				    "address area; offset active\n");
675 			break;
676 		case 0x0D:
677 			dev_warn(&device->cdev->dev,
678 				    "FORMAT 4 - No sync byte in count "
679 				    "address area; offset active\n");
680 			break;
681 		case 0x0E:
682 			dev_warn(&device->cdev->dev,
683 				    "FORMAT 4 - No sync byte in key area; "
684 				    "offset active\n");
685 			break;
686 		case 0x0F:
687 			dev_warn(&device->cdev->dev,
688 				    "FORMAT 4 - No sync byte in data area; "
689 				    "offset active\n");
690 			break;
691 		default:
692 			dev_warn(&device->cdev->dev,
693 				    "FORMAT 4 - Reserved\n");
694 		}
695 		break;
696 
697 	case 0x50:  /* Format 5 - Data Check with displacement information */
698 		switch (msg_no) {
699 		case 0x00:
700 			dev_warn(&device->cdev->dev,
701 				    "FORMAT 5 - Data Check in the "
702 				    "home address area\n");
703 			break;
704 		case 0x01:
705 			dev_warn(&device->cdev->dev,
706 				 "FORMAT 5 - Data Check in the count "
707 				 "area\n");
708 			break;
709 		case 0x02:
710 			dev_warn(&device->cdev->dev,
711 				    "FORMAT 5 - Data Check in the key area\n");
712 			break;
713 		case 0x03:
714 			dev_warn(&device->cdev->dev,
715 				 "FORMAT 5 - Data Check in the data "
716 				 "area\n");
717 			break;
718 		case 0x08:
719 			dev_warn(&device->cdev->dev,
720 				    "FORMAT 5 - Data Check in the "
721 				    "home address area; offset active\n");
722 			break;
723 		case 0x09:
724 			dev_warn(&device->cdev->dev,
725 				    "FORMAT 5 - Data Check in the count area; "
726 				    "offset active\n");
727 			break;
728 		case 0x0A:
729 			dev_warn(&device->cdev->dev,
730 				    "FORMAT 5 - Data Check in the key area; "
731 				    "offset active\n");
732 			break;
733 		case 0x0B:
734 			dev_warn(&device->cdev->dev,
735 				    "FORMAT 5 - Data Check in the data area; "
736 				    "offset active\n");
737 			break;
738 		default:
739 			dev_warn(&device->cdev->dev,
740 				    "FORMAT 5 - Reserved\n");
741 		}
742 		break;
743 
744 	case 0x60:  /* Format 6 - Usage Statistics/Overrun Errors */
745 		switch (msg_no) {
746 		case 0x00:
747 			dev_warn(&device->cdev->dev,
748 				    "FORMAT 6 - Overrun on channel A\n");
749 			break;
750 		case 0x01:
751 			dev_warn(&device->cdev->dev,
752 				    "FORMAT 6 - Overrun on channel B\n");
753 			break;
754 		case 0x02:
755 			dev_warn(&device->cdev->dev,
756 				    "FORMAT 6 - Overrun on channel C\n");
757 			break;
758 		case 0x03:
759 			dev_warn(&device->cdev->dev,
760 				    "FORMAT 6 - Overrun on channel D\n");
761 			break;
762 		case 0x04:
763 			dev_warn(&device->cdev->dev,
764 				    "FORMAT 6 - Overrun on channel E\n");
765 			break;
766 		case 0x05:
767 			dev_warn(&device->cdev->dev,
768 				    "FORMAT 6 - Overrun on channel F\n");
769 			break;
770 		case 0x06:
771 			dev_warn(&device->cdev->dev,
772 				    "FORMAT 6 - Overrun on channel G\n");
773 			break;
774 		case 0x07:
775 			dev_warn(&device->cdev->dev,
776 				    "FORMAT 6 - Overrun on channel H\n");
777 			break;
778 		default:
779 			dev_warn(&device->cdev->dev,
780 				    "FORMAT 6 - Reserved\n");
781 		}
782 		break;
783 
784 	case 0x70:  /* Format 7 - Device Connection Control Checks */
785 		switch (msg_no) {
786 		case 0x00:
787 			dev_warn(&device->cdev->dev,
788 				    "FORMAT 7 - RCC initiated by a connection "
789 				    "check alert\n");
790 			break;
791 		case 0x01:
792 			dev_warn(&device->cdev->dev,
793 				    "FORMAT 7 - RCC 1 sequence not "
794 				    "successful\n");
795 			break;
796 		case 0x02:
797 			dev_warn(&device->cdev->dev,
798 				    "FORMAT 7 - RCC 1 and RCC 2 sequences not "
799 				    "successful\n");
800 			break;
801 		case 0x03:
802 			dev_warn(&device->cdev->dev,
803 				    "FORMAT 7 - Invalid tag-in during "
804 				    "selection sequence\n");
805 			break;
806 		case 0x04:
807 			dev_warn(&device->cdev->dev,
808 				    "FORMAT 7 - extra RCC required\n");
809 			break;
810 		case 0x05:
811 			dev_warn(&device->cdev->dev,
812 				    "FORMAT 7 - Invalid DCC selection "
813 				    "response or timeout\n");
814 			break;
815 		case 0x06:
816 			dev_warn(&device->cdev->dev,
817 				    "FORMAT 7 - Missing end operation; device "
818 				    "transfer complete\n");
819 			break;
820 		case 0x07:
821 			dev_warn(&device->cdev->dev,
822 				    "FORMAT 7 - Missing end operation; device "
823 				    "transfer incomplete\n");
824 			break;
825 		case 0x08:
826 			dev_warn(&device->cdev->dev,
827 				    "FORMAT 7 - Invalid tag-in for an "
828 				    "immediate command sequence\n");
829 			break;
830 		case 0x09:
831 			dev_warn(&device->cdev->dev,
832 				    "FORMAT 7 - Invalid tag-in for an "
833 				    "extended command sequence\n");
834 			break;
835 		case 0x0A:
836 			dev_warn(&device->cdev->dev,
837 				    "FORMAT 7 - 3990 microcode time out when "
838 				    "stopping selection\n");
839 			break;
840 		case 0x0B:
841 			dev_warn(&device->cdev->dev,
842 				    "FORMAT 7 - No response to selection "
843 				    "after a poll interruption\n");
844 			break;
845 		case 0x0C:
846 			dev_warn(&device->cdev->dev,
847 				    "FORMAT 7 - Permanent path error (DASD "
848 				    "controller not available)\n");
849 			break;
850 		case 0x0D:
851 			dev_warn(&device->cdev->dev,
852 				    "FORMAT 7 - DASD controller not available"
853 				    " on disconnected command chain\n");
854 			break;
855 		default:
856 			dev_warn(&device->cdev->dev,
857 				    "FORMAT 7 - Reserved\n");
858 		}
859 		break;
860 
861 	case 0x80:  /* Format 8 - Additional Device Equipment Checks */
862 		switch (msg_no) {
863 		case 0x00:	/* No Message */
864 		case 0x01:
865 			dev_warn(&device->cdev->dev,
866 				    "FORMAT 8 - Error correction code "
867 				    "hardware fault\n");
868 			break;
869 		case 0x03:
870 			dev_warn(&device->cdev->dev,
871 				    "FORMAT 8 - Unexpected end operation "
872 				    "response code\n");
873 			break;
874 		case 0x04:
875 			dev_warn(&device->cdev->dev,
876 				    "FORMAT 8 - End operation with transfer "
877 				    "count not zero\n");
878 			break;
879 		case 0x05:
880 			dev_warn(&device->cdev->dev,
881 				    "FORMAT 8 - End operation with transfer "
882 				    "count zero\n");
883 			break;
884 		case 0x06:
885 			dev_warn(&device->cdev->dev,
886 				    "FORMAT 8 - DPS checks after a system "
887 				    "reset or selective reset\n");
888 			break;
889 		case 0x07:
890 			dev_warn(&device->cdev->dev,
891 				    "FORMAT 8 - DPS cannot be filled\n");
892 			break;
893 		case 0x08:
894 			dev_warn(&device->cdev->dev,
895 				    "FORMAT 8 - Short busy time-out during "
896 				    "device selection\n");
897 			break;
898 		case 0x09:
899 			dev_warn(&device->cdev->dev,
900 				    "FORMAT 8 - DASD controller failed to "
901 				    "set or reset the long busy latch\n");
902 			break;
903 		case 0x0A:
904 			dev_warn(&device->cdev->dev,
905 				    "FORMAT 8 - No interruption from device "
906 				    "during a command chain\n");
907 			break;
908 		default:
909 			dev_warn(&device->cdev->dev,
910 				    "FORMAT 8 - Reserved\n");
911 		}
912 		break;
913 
914 	case 0x90:  /* Format 9 - Device Read, Write, and Seek Checks */
915 		switch (msg_no) {
916 		case 0x00:
917 			break;	/* No Message */
918 		case 0x06:
919 			dev_warn(&device->cdev->dev,
920 				    "FORMAT 9 - Device check-2 error\n");
921 			break;
922 		case 0x07:
923 			dev_warn(&device->cdev->dev,
924 				 "FORMAT 9 - Head address did not "
925 				 "compare\n");
926 			break;
927 		case 0x0A:
928 			dev_warn(&device->cdev->dev,
929 				    "FORMAT 9 - Track physical address did "
930 				    "not compare while oriented\n");
931 			break;
932 		case 0x0E:
933 			dev_warn(&device->cdev->dev,
934 				    "FORMAT 9 - Cylinder address did not "
935 				    "compare\n");
936 			break;
937 		default:
938 			dev_warn(&device->cdev->dev,
939 				    "FORMAT 9 - Reserved\n");
940 		}
941 		break;
942 
943 	case 0xF0:		/* Format F - Cache Storage Checks */
944 		switch (msg_no) {
945 		case 0x00:
946 			dev_warn(&device->cdev->dev,
947 				    "FORMAT F - Operation Terminated\n");
948 			break;
949 		case 0x01:
950 			dev_warn(&device->cdev->dev,
951 				    "FORMAT F - Subsystem Processing Error\n");
952 			break;
953 		case 0x02:
954 			dev_warn(&device->cdev->dev,
955 				    "FORMAT F - Cache or nonvolatile storage "
956 				    "equipment failure\n");
957 			break;
958 		case 0x04:
959 			dev_warn(&device->cdev->dev,
960 				    "FORMAT F - Caching terminated\n");
961 			break;
962 		case 0x06:
963 			dev_warn(&device->cdev->dev,
964 				    "FORMAT F - Cache fast write access not "
965 				    "authorized\n");
966 			break;
967 		case 0x07:
968 			dev_warn(&device->cdev->dev,
969 				    "FORMAT F - Track format incorrect\n");
970 			break;
971 		case 0x09:
972 			dev_warn(&device->cdev->dev,
973 				    "FORMAT F - Caching reinitiated\n");
974 			break;
975 		case 0x0A:
976 			dev_warn(&device->cdev->dev,
977 				    "FORMAT F - Nonvolatile storage "
978 				    "terminated\n");
979 			break;
980 		case 0x0B:
981 			dev_warn(&device->cdev->dev,
982 				    "FORMAT F - Volume is suspended duplex\n");
983 			/* call extended error reporting (EER) */
984 			dasd_eer_write(device, erp->refers,
985 				       DASD_EER_PPRCSUSPEND);
986 			break;
987 		case 0x0C:
988 			dev_warn(&device->cdev->dev,
989 				    "FORMAT F - Subsystem status cannot be "
990 				    "determined\n");
991 			break;
992 		case 0x0D:
993 			dev_warn(&device->cdev->dev,
994 				    "FORMAT F - Caching status reset to "
995 				    "default\n");
996 			break;
997 		case 0x0E:
998 			dev_warn(&device->cdev->dev,
999 				    "FORMAT F - DASD Fast Write inhibited\n");
1000 			break;
1001 		default:
1002 			dev_warn(&device->cdev->dev,
1003 				    "FORMAT F - Reserved\n");
1004 		}
1005 		break;
1006 
1007 	default:	/* unknown message format - should not happen
1008 			   internal error 03 - unknown message format */
1009 		snprintf(errorstring, ERRORLENGTH, "03 %x02", msg_format);
1010 		dev_err(&device->cdev->dev,
1011 			 "An error occurred in the DASD device driver, "
1012 			 "reason=%s\n", errorstring);
1013 		break;
1014 	}			/* end switch message format */
1015 
1016 }				/* end dasd_3990_handle_env_data */
1017 
1018 /*
1019  * DASD_3990_ERP_COM_REJ
1020  *
1021  * DESCRIPTION
1022  *   Handles 24 byte 'Command Reject' error.
1023  *
1024  * PARAMETER
1025  *   erp		current erp_head
1026  *   sense		current sense data
1027  *
1028  * RETURN VALUES
1029  *   erp		'new' erp_head - pointer to new ERP
1030  */
1031 static struct dasd_ccw_req *
1032 dasd_3990_erp_com_rej(struct dasd_ccw_req * erp, char *sense)
1033 {
1034 
1035 	struct dasd_device *device = erp->startdev;
1036 
1037 	erp->function = dasd_3990_erp_com_rej;
1038 
1039 	/* env data present (ACTION 10 - retry should work) */
1040 	if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1041 
1042 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1043 			    "Command Reject - environmental data present");
1044 
1045 		dasd_3990_handle_env_data(erp, sense);
1046 
1047 		erp->retries = 5;
1048 
1049 	} else if (sense[1] & SNS1_WRITE_INHIBITED) {
1050 		dev_err(&device->cdev->dev, "An I/O request was rejected"
1051 			" because writing is inhibited\n");
1052 		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1053 	} else if (sense[7] & SNS7_INVALID_ON_SEC) {
1054 		dev_err(&device->cdev->dev, "An I/O request was rejected on a copy pair secondary device\n");
1055 		/* suppress dump of sense data for this error */
1056 		set_bit(DASD_CQR_SUPPRESS_CR, &erp->refers->flags);
1057 		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1058 	} else {
1059 		/* fatal error -  set status to FAILED
1060 		   internal error 09 - Command Reject */
1061 		if (!test_bit(DASD_CQR_SUPPRESS_CR, &erp->flags))
1062 			dev_err(&device->cdev->dev,
1063 				"An error occurred in the DASD device driver, reason=09\n");
1064 
1065 		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1066 	}
1067 
1068 	return erp;
1069 
1070 }				/* end dasd_3990_erp_com_rej */
1071 
1072 /*
1073  * DASD_3990_ERP_BUS_OUT
1074  *
1075  * DESCRIPTION
1076  *   Handles 24 byte 'Bus Out Parity Check' error.
1077  *
1078  * PARAMETER
1079  *   erp		current erp_head
1080  * RETURN VALUES
1081  *   erp		new erp_head - pointer to new ERP
1082  */
1083 static struct dasd_ccw_req *
1084 dasd_3990_erp_bus_out(struct dasd_ccw_req * erp)
1085 {
1086 
1087 	struct dasd_device *device = erp->startdev;
1088 
1089 	/* first time set initial retry counter and erp_function */
1090 	/* and retry once without blocking queue		 */
1091 	/* (this enables easier enqueing of the cqr)		 */
1092 	if (erp->function != dasd_3990_erp_bus_out) {
1093 		erp->retries = 256;
1094 		erp->function = dasd_3990_erp_bus_out;
1095 
1096 	} else {
1097 
1098 		/* issue a message and wait for 'device ready' interrupt */
1099 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1100 			    "bus out parity error or BOPC requested by "
1101 			    "channel");
1102 
1103 		dasd_3990_erp_block_queue(erp, 60*HZ);
1104 
1105 	}
1106 
1107 	return erp;
1108 
1109 }				/* end dasd_3990_erp_bus_out */
1110 
1111 /*
1112  * DASD_3990_ERP_EQUIP_CHECK
1113  *
1114  * DESCRIPTION
1115  *   Handles 24 byte 'Equipment Check' error.
1116  *
1117  * PARAMETER
1118  *   erp		current erp_head
1119  * RETURN VALUES
1120  *   erp		new erp_head - pointer to new ERP
1121  */
1122 static struct dasd_ccw_req *
1123 dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense)
1124 {
1125 
1126 	struct dasd_device *device = erp->startdev;
1127 
1128 	erp->function = dasd_3990_erp_equip_check;
1129 
1130 	if (sense[1] & SNS1_WRITE_INHIBITED) {
1131 		dev_info(&device->cdev->dev,
1132 			    "Write inhibited path encountered\n");
1133 
1134 		/* vary path offline
1135 		   internal error 04 - Path should be varied off-line.*/
1136 		dev_err(&device->cdev->dev, "An error occurred in the DASD "
1137 			"device driver, reason=%s\n", "04");
1138 
1139 		erp = dasd_3990_erp_action_1(erp);
1140 
1141 	} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1142 
1143 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1144 			    "Equipment Check - " "environmental data present");
1145 
1146 		dasd_3990_handle_env_data(erp, sense);
1147 
1148 		erp = dasd_3990_erp_action_4(erp, sense);
1149 
1150 	} else if (sense[1] & SNS1_PERM_ERR) {
1151 
1152 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1153 			    "Equipment Check - retry exhausted or "
1154 			    "undesirable");
1155 
1156 		erp = dasd_3990_erp_action_1(erp);
1157 
1158 	} else {
1159 		/* all other equipment checks - Action 5 */
1160 		/* rest is done when retries == 0 */
1161 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1162 			    "Equipment check or processing error");
1163 
1164 		erp = dasd_3990_erp_action_5(erp);
1165 	}
1166 	return erp;
1167 
1168 }				/* end dasd_3990_erp_equip_check */
1169 
1170 /*
1171  * DASD_3990_ERP_DATA_CHECK
1172  *
1173  * DESCRIPTION
1174  *   Handles 24 byte 'Data Check' error.
1175  *
1176  * PARAMETER
1177  *   erp		current erp_head
1178  * RETURN VALUES
1179  *   erp		new erp_head - pointer to new ERP
1180  */
1181 static struct dasd_ccw_req *
1182 dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense)
1183 {
1184 
1185 	struct dasd_device *device = erp->startdev;
1186 
1187 	erp->function = dasd_3990_erp_data_check;
1188 
1189 	if (sense[2] & SNS2_CORRECTABLE) {	/* correctable data check */
1190 
1191 		/* issue message that the data has been corrected */
1192 		dev_emerg(&device->cdev->dev,
1193 			    "Data recovered during retry with PCI "
1194 			    "fetch mode active\n");
1195 
1196 		/* not possible to handle this situation in Linux */
1197 		panic("No way to inform application about the possibly "
1198 		      "incorrect data");
1199 
1200 	} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1201 
1202 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1203 			    "Uncorrectable data check recovered secondary "
1204 			    "addr of duplex pair");
1205 
1206 		erp = dasd_3990_erp_action_4(erp, sense);
1207 
1208 	} else if (sense[1] & SNS1_PERM_ERR) {
1209 
1210 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1211 			    "Uncorrectable data check with internal "
1212 			    "retry exhausted");
1213 
1214 		erp = dasd_3990_erp_action_1(erp);
1215 
1216 	} else {
1217 		/* all other data checks */
1218 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1219 			    "Uncorrectable data check with retry count "
1220 			    "exhausted...");
1221 
1222 		erp = dasd_3990_erp_action_5(erp);
1223 	}
1224 
1225 	return erp;
1226 
1227 }				/* end dasd_3990_erp_data_check */
1228 
1229 /*
1230  * DASD_3990_ERP_OVERRUN
1231  *
1232  * DESCRIPTION
1233  *   Handles 24 byte 'Overrun' error.
1234  *
1235  * PARAMETER
1236  *   erp		current erp_head
1237  * RETURN VALUES
1238  *   erp		new erp_head - pointer to new ERP
1239  */
1240 static struct dasd_ccw_req *
1241 dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense)
1242 {
1243 
1244 	struct dasd_device *device = erp->startdev;
1245 
1246 	erp->function = dasd_3990_erp_overrun;
1247 
1248 	DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1249 		    "Overrun - service overrun or overrun"
1250 		    " error requested by channel");
1251 
1252 	erp = dasd_3990_erp_action_5(erp);
1253 
1254 	return erp;
1255 
1256 }				/* end dasd_3990_erp_overrun */
1257 
1258 /*
1259  * DASD_3990_ERP_INV_FORMAT
1260  *
1261  * DESCRIPTION
1262  *   Handles 24 byte 'Invalid Track Format' error.
1263  *
1264  * PARAMETER
1265  *   erp		current erp_head
1266  * RETURN VALUES
1267  *   erp		new erp_head - pointer to new ERP
1268  */
1269 static struct dasd_ccw_req *
1270 dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense)
1271 {
1272 
1273 	struct dasd_device *device = erp->startdev;
1274 
1275 	erp->function = dasd_3990_erp_inv_format;
1276 
1277 	if (sense[2] & SNS2_ENV_DATA_PRESENT) {
1278 
1279 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1280 			    "Track format error when destaging or "
1281 			    "staging data");
1282 
1283 		dasd_3990_handle_env_data(erp, sense);
1284 
1285 		erp = dasd_3990_erp_action_4(erp, sense);
1286 
1287 	} else {
1288 		/* internal error 06 - The track format is not valid*/
1289 		dev_err(&device->cdev->dev,
1290 			"An error occurred in the DASD device driver, "
1291 			"reason=%s\n", "06");
1292 
1293 		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1294 	}
1295 
1296 	return erp;
1297 
1298 }				/* end dasd_3990_erp_inv_format */
1299 
1300 /*
1301  * DASD_3990_ERP_EOC
1302  *
1303  * DESCRIPTION
1304  *   Handles 24 byte 'End-of-Cylinder' error.
1305  *
1306  * PARAMETER
1307  *   erp		already added default erp
1308  * RETURN VALUES
1309  *   erp		pointer to original (failed) cqr.
1310  */
1311 static struct dasd_ccw_req *
1312 dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense)
1313 {
1314 
1315 	struct dasd_device *device = default_erp->startdev;
1316 
1317 	dev_err(&device->cdev->dev,
1318 		"The cylinder data for accessing the DASD is inconsistent\n");
1319 
1320 	/* implement action 7 - BUG */
1321 	return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1322 
1323 }				/* end dasd_3990_erp_EOC */
1324 
1325 /*
1326  * DASD_3990_ERP_ENV_DATA
1327  *
1328  * DESCRIPTION
1329  *   Handles 24 byte 'Environmental-Data Present' error.
1330  *
1331  * PARAMETER
1332  *   erp		current erp_head
1333  * RETURN VALUES
1334  *   erp		new erp_head - pointer to new ERP
1335  */
1336 static struct dasd_ccw_req *
1337 dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense)
1338 {
1339 
1340 	struct dasd_device *device = erp->startdev;
1341 
1342 	erp->function = dasd_3990_erp_env_data;
1343 
1344 	DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Environmental data present");
1345 
1346 	dasd_3990_handle_env_data(erp, sense);
1347 
1348 	/* don't retry on disabled interface */
1349 	if (sense[7] != 0x0F) {
1350 		erp = dasd_3990_erp_action_4(erp, sense);
1351 	} else {
1352 		erp->status = DASD_CQR_FILLED;
1353 	}
1354 
1355 	return erp;
1356 
1357 }				/* end dasd_3990_erp_env_data */
1358 
1359 /*
1360  * DASD_3990_ERP_NO_REC
1361  *
1362  * DESCRIPTION
1363  *   Handles 24 byte 'No Record Found' error.
1364  *
1365  * PARAMETER
1366  *   erp		already added default ERP
1367  *
1368  * RETURN VALUES
1369  *   erp		new erp_head - pointer to new ERP
1370  */
1371 static struct dasd_ccw_req *
1372 dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense)
1373 {
1374 
1375 	struct dasd_device *device = default_erp->startdev;
1376 
1377 	/*
1378 	 * In some cases the 'No Record Found' error might be expected and
1379 	 * log messages shouldn't be written then.
1380 	 * Check if the according suppress bit is set.
1381 	 */
1382 	if (!test_bit(DASD_CQR_SUPPRESS_NRF, &default_erp->flags))
1383 		dev_err(&device->cdev->dev,
1384 			"The specified record was not found\n");
1385 
1386 	return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1387 
1388 }				/* end dasd_3990_erp_no_rec */
1389 
1390 /*
1391  * DASD_3990_ERP_FILE_PROT
1392  *
1393  * DESCRIPTION
1394  *   Handles 24 byte 'File Protected' error.
1395  *   Note: Seek related recovery is not implemented because
1396  *	   wee don't use the seek command yet.
1397  *
1398  * PARAMETER
1399  *   erp		current erp_head
1400  * RETURN VALUES
1401  *   erp		new erp_head - pointer to new ERP
1402  */
1403 static struct dasd_ccw_req *
1404 dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
1405 {
1406 
1407 	struct dasd_device *device = erp->startdev;
1408 
1409 	/*
1410 	 * In some cases the 'File Protected' error might be expected and
1411 	 * log messages shouldn't be written then.
1412 	 * Check if the according suppress bit is set.
1413 	 */
1414 	if (!test_bit(DASD_CQR_SUPPRESS_FP, &erp->flags))
1415 		dev_err(&device->cdev->dev,
1416 			"Accessing the DASD failed because of a hardware error\n");
1417 
1418 	return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
1419 
1420 }				/* end dasd_3990_erp_file_prot */
1421 
1422 /*
1423  * DASD_3990_ERP_INSPECT_ALIAS
1424  *
1425  * DESCRIPTION
1426  *   Checks if the original request was started on an alias device.
1427  *   If yes, it modifies the original and the erp request so that
1428  *   the erp request can be started on a base device.
1429  *
1430  * PARAMETER
1431  *   erp		pointer to the currently created default ERP
1432  *
1433  * RETURN VALUES
1434  *   erp		pointer to the modified ERP, or NULL
1435  */
1436 
1437 static struct dasd_ccw_req *dasd_3990_erp_inspect_alias(
1438 						struct dasd_ccw_req *erp)
1439 {
1440 	struct dasd_ccw_req *cqr = erp->refers;
1441 	char *sense;
1442 
1443 	if (cqr->block &&
1444 	    (cqr->block->base != cqr->startdev)) {
1445 
1446 		sense = dasd_get_sense(&erp->refers->irb);
1447 		/*
1448 		 * dynamic pav may have changed base alias mapping
1449 		 */
1450 		if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense
1451 		    && (sense[0] == 0x10) && (sense[7] == 0x0F)
1452 		    && (sense[8] == 0x67)) {
1453 			/*
1454 			 * remove device from alias handling to prevent new
1455 			 * requests from being scheduled on the
1456 			 * wrong alias device
1457 			 */
1458 			dasd_alias_remove_device(cqr->startdev);
1459 
1460 			/* schedule worker to reload device */
1461 			dasd_reload_device(cqr->startdev);
1462 		}
1463 
1464 		if (cqr->startdev->features & DASD_FEATURE_ERPLOG) {
1465 			DBF_DEV_EVENT(DBF_ERR, cqr->startdev,
1466 				    "ERP on alias device for request %p,"
1467 				    " recover on base device %s", cqr,
1468 				    dev_name(&cqr->block->base->cdev->dev));
1469 		}
1470 		dasd_eckd_reset_ccw_to_base_io(cqr);
1471 		erp->startdev = cqr->block->base;
1472 		erp->function = dasd_3990_erp_inspect_alias;
1473 		return erp;
1474 	} else
1475 		return NULL;
1476 }
1477 
1478 
1479 /*
1480  * DASD_3990_ERP_INSPECT_24
1481  *
1482  * DESCRIPTION
1483  *   Does a detailed inspection of the 24 byte sense data
1484  *   and sets up a related error recovery action.
1485  *
1486  * PARAMETER
1487  *   sense		sense data of the actual error
1488  *   erp		pointer to the currently created default ERP
1489  *
1490  * RETURN VALUES
1491  *   erp		pointer to the (addtitional) ERP
1492  */
1493 static struct dasd_ccw_req *
1494 dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense)
1495 {
1496 
1497 	struct dasd_ccw_req *erp_filled = NULL;
1498 
1499 	/* Check sense for ....	   */
1500 	/* 'Command Reject'	   */
1501 	if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) {
1502 		erp_filled = dasd_3990_erp_com_rej(erp, sense);
1503 	}
1504 	/* 'Intervention Required' */
1505 	if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) {
1506 		erp_filled = dasd_3990_erp_int_req(erp);
1507 	}
1508 	/* 'Bus Out Parity Check'  */
1509 	if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) {
1510 		erp_filled = dasd_3990_erp_bus_out(erp);
1511 	}
1512 	/* 'Equipment Check'	   */
1513 	if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) {
1514 		erp_filled = dasd_3990_erp_equip_check(erp, sense);
1515 	}
1516 	/* 'Data Check'		   */
1517 	if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) {
1518 		erp_filled = dasd_3990_erp_data_check(erp, sense);
1519 	}
1520 	/* 'Overrun'		   */
1521 	if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) {
1522 		erp_filled = dasd_3990_erp_overrun(erp, sense);
1523 	}
1524 	/* 'Invalid Track Format'  */
1525 	if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) {
1526 		erp_filled = dasd_3990_erp_inv_format(erp, sense);
1527 	}
1528 	/* 'End-of-Cylinder'	   */
1529 	if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) {
1530 		erp_filled = dasd_3990_erp_EOC(erp, sense);
1531 	}
1532 	/* 'Environmental Data'	   */
1533 	if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) {
1534 		erp_filled = dasd_3990_erp_env_data(erp, sense);
1535 	}
1536 	/* 'No Record Found'	   */
1537 	if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) {
1538 		erp_filled = dasd_3990_erp_no_rec(erp, sense);
1539 	}
1540 	/* 'File Protected'	   */
1541 	if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) {
1542 		erp_filled = dasd_3990_erp_file_prot(erp);
1543 	}
1544 	/* other (unknown) error - do default ERP */
1545 	if (erp_filled == NULL) {
1546 
1547 		erp_filled = erp;
1548 	}
1549 
1550 	return erp_filled;
1551 
1552 }				/* END dasd_3990_erp_inspect_24 */
1553 
1554 /*
1555  *****************************************************************************
1556  * 32 byte sense ERP functions (only)
1557  *****************************************************************************
1558  */
1559 
1560 /*
1561  * DASD_3990_ERPACTION_10_32
1562  *
1563  * DESCRIPTION
1564  *   Handles 32 byte 'Action 10' of Single Program Action Codes.
1565  *   Just retry and if retry doesn't work, return with error.
1566  *
1567  * PARAMETER
1568  *   erp		current erp_head
1569  *   sense		current sense data
1570  * RETURN VALUES
1571  *   erp		modified erp_head
1572  */
1573 static struct dasd_ccw_req *
1574 dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense)
1575 {
1576 
1577 	struct dasd_device *device = erp->startdev;
1578 
1579 	erp->retries = 256;
1580 	erp->function = dasd_3990_erp_action_10_32;
1581 
1582 	DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Perform logging requested");
1583 
1584 	return erp;
1585 
1586 }				/* end dasd_3990_erp_action_10_32 */
1587 
1588 /*
1589  * DASD_3990_ERP_ACTION_1B_32
1590  *
1591  * DESCRIPTION
1592  *   Handles 32 byte 'Action 1B' of Single Program Action Codes.
1593  *   A write operation could not be finished because of an unexpected
1594  *   condition.
1595  *   The already created 'default erp' is used to get the link to
1596  *   the erp chain, but it can not be used for this recovery
1597  *   action because it contains no DE/LO data space.
1598  *
1599  * PARAMETER
1600  *   default_erp	already added default erp.
1601  *   sense		current sense data
1602  *
1603  * RETURN VALUES
1604  *   erp		new erp or
1605  *			default_erp in case of imprecise ending or error
1606  */
1607 static struct dasd_ccw_req *
1608 dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
1609 {
1610 
1611 	struct dasd_device *device = default_erp->startdev;
1612 	__u32 cpa = 0;
1613 	struct dasd_ccw_req *cqr;
1614 	struct dasd_ccw_req *erp;
1615 	struct DE_eckd_data *DE_data;
1616 	struct PFX_eckd_data *PFX_data;
1617 	char *LO_data;		/* LO_eckd_data_t */
1618 	struct ccw1 *ccw, *oldccw;
1619 
1620 	DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1621 		    "Write not finished because of unexpected condition");
1622 
1623 	default_erp->function = dasd_3990_erp_action_1B_32;
1624 
1625 	/* determine the original cqr */
1626 	cqr = default_erp;
1627 
1628 	while (cqr->refers != NULL) {
1629 		cqr = cqr->refers;
1630 	}
1631 
1632 	if (scsw_is_tm(&cqr->irb.scsw)) {
1633 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1634 			      "32 bit sense, action 1B is not defined"
1635 			      " in transport mode - just retry");
1636 		return default_erp;
1637 	}
1638 
1639 	/* for imprecise ending just do default erp */
1640 	if (sense[1] & 0x01) {
1641 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1642 			    "Imprecise ending is set - just retry");
1643 
1644 		return default_erp;
1645 	}
1646 
1647 	/* determine the address of the CCW to be restarted */
1648 	/* Imprecise ending is not set -> addr from IRB-SCSW */
1649 	cpa = default_erp->refers->irb.scsw.cmd.cpa;
1650 
1651 	if (cpa == 0) {
1652 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1653 			    "Unable to determine address of the CCW "
1654 			    "to be restarted");
1655 
1656 		return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1657 	}
1658 
1659 	/* Build new ERP request including DE/LO */
1660 	erp = dasd_alloc_erp_request(cqr->magic,
1661 				     2 + 1,/* DE/LO + TIC */
1662 				     sizeof(struct DE_eckd_data) +
1663 				     sizeof(struct LO_eckd_data), device);
1664 
1665 	if (IS_ERR(erp)) {
1666 		/* internal error 01 - Unable to allocate ERP */
1667 		dev_err(&device->cdev->dev, "An error occurred in the DASD "
1668 			"device driver, reason=%s\n", "01");
1669 		return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1670 	}
1671 
1672 	/* use original DE */
1673 	DE_data = erp->data;
1674 	oldccw = cqr->cpaddr;
1675 	if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) {
1676 		PFX_data = cqr->data;
1677 		memcpy(DE_data, &PFX_data->define_extent,
1678 		       sizeof(struct DE_eckd_data));
1679 	} else
1680 		memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data));
1681 
1682 	/* create LO */
1683 	LO_data = erp->data + sizeof(struct DE_eckd_data);
1684 
1685 	if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1686 		/* should not */
1687 		return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
1688 	}
1689 
1690 	if ((sense[7] & 0x3F) == 0x01) {
1691 		/* operation code is WRITE DATA -> data area orientation */
1692 		LO_data[0] = 0x81;
1693 
1694 	} else if ((sense[7] & 0x3F) == 0x03) {
1695 		/* operation code is FORMAT WRITE -> index orientation */
1696 		LO_data[0] = 0xC3;
1697 
1698 	} else {
1699 		LO_data[0] = sense[7];	/* operation */
1700 	}
1701 
1702 	LO_data[1] = sense[8];	/* auxiliary */
1703 	LO_data[2] = sense[9];
1704 	LO_data[3] = sense[3];	/* count */
1705 	LO_data[4] = sense[29];	/* seek_addr.cyl */
1706 	LO_data[5] = sense[30];	/* seek_addr.cyl 2nd byte */
1707 	LO_data[7] = sense[31];	/* seek_addr.head 2nd byte */
1708 
1709 	memcpy(&(LO_data[8]), &(sense[11]), 8);
1710 
1711 	/* create DE ccw */
1712 	ccw = erp->cpaddr;
1713 	memset(ccw, 0, sizeof(struct ccw1));
1714 	ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
1715 	ccw->flags = CCW_FLAG_CC;
1716 	ccw->count = 16;
1717 	ccw->cda = (__u32)(addr_t) DE_data;
1718 
1719 	/* create LO ccw */
1720 	ccw++;
1721 	memset(ccw, 0, sizeof(struct ccw1));
1722 	ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
1723 	ccw->flags = CCW_FLAG_CC;
1724 	ccw->count = 16;
1725 	ccw->cda = (__u32)(addr_t) LO_data;
1726 
1727 	/* TIC to the failed ccw */
1728 	ccw++;
1729 	ccw->cmd_code = CCW_CMD_TIC;
1730 	ccw->cda = cpa;
1731 
1732 	/* fill erp related fields */
1733 	erp->flags = default_erp->flags;
1734 	erp->function = dasd_3990_erp_action_1B_32;
1735 	erp->refers = default_erp->refers;
1736 	erp->startdev = device;
1737 	erp->memdev = device;
1738 	erp->magic = default_erp->magic;
1739 	erp->expires = default_erp->expires;
1740 	erp->retries = 256;
1741 	erp->buildclk = get_tod_clock();
1742 	erp->status = DASD_CQR_FILLED;
1743 
1744 	/* remove the default erp */
1745 	dasd_free_erp_request(default_erp, device);
1746 
1747 	return erp;
1748 
1749 }				/* end dasd_3990_erp_action_1B_32 */
1750 
1751 /*
1752  * DASD_3990_UPDATE_1B
1753  *
1754  * DESCRIPTION
1755  *   Handles the update to the 32 byte 'Action 1B' of Single Program
1756  *   Action Codes in case the first action was not successful.
1757  *   The already created 'previous_erp' is the currently not successful
1758  *   ERP.
1759  *
1760  * PARAMETER
1761  *   previous_erp	already created previous erp.
1762  *   sense		current sense data
1763  * RETURN VALUES
1764  *   erp		modified erp
1765  */
1766 static struct dasd_ccw_req *
1767 dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense)
1768 {
1769 
1770 	struct dasd_device *device = previous_erp->startdev;
1771 	__u32 cpa = 0;
1772 	struct dasd_ccw_req *cqr;
1773 	struct dasd_ccw_req *erp;
1774 	char *LO_data;		/* struct LO_eckd_data */
1775 	struct ccw1 *ccw;
1776 
1777 	DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1778 		    "Write not finished because of unexpected condition"
1779 		    " - follow on");
1780 
1781 	/* determine the original cqr */
1782 	cqr = previous_erp;
1783 
1784 	while (cqr->refers != NULL) {
1785 		cqr = cqr->refers;
1786 	}
1787 
1788 	if (scsw_is_tm(&cqr->irb.scsw)) {
1789 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1790 			      "32 bit sense, action 1B, update,"
1791 			      " in transport mode - just retry");
1792 		return previous_erp;
1793 	}
1794 
1795 	/* for imprecise ending just do default erp */
1796 	if (sense[1] & 0x01) {
1797 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1798 			    "Imprecise ending is set - just retry");
1799 
1800 		previous_erp->status = DASD_CQR_FILLED;
1801 
1802 		return previous_erp;
1803 	}
1804 
1805 	/* determine the address of the CCW to be restarted */
1806 	/* Imprecise ending is not set -> addr from IRB-SCSW */
1807 	cpa = previous_erp->irb.scsw.cmd.cpa;
1808 
1809 	if (cpa == 0) {
1810 		/* internal error 02 -
1811 		   Unable to determine address of the CCW to be restarted */
1812 		dev_err(&device->cdev->dev, "An error occurred in the DASD "
1813 			"device driver, reason=%s\n", "02");
1814 
1815 		previous_erp->status = DASD_CQR_FAILED;
1816 
1817 		return previous_erp;
1818 	}
1819 
1820 	erp = previous_erp;
1821 
1822 	/* update the LO with the new returned sense data  */
1823 	LO_data = erp->data + sizeof(struct DE_eckd_data);
1824 
1825 	if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
1826 		/* should not happen */
1827 		previous_erp->status = DASD_CQR_FAILED;
1828 
1829 		return previous_erp;
1830 	}
1831 
1832 	if ((sense[7] & 0x3F) == 0x01) {
1833 		/* operation code is WRITE DATA -> data area orientation */
1834 		LO_data[0] = 0x81;
1835 
1836 	} else if ((sense[7] & 0x3F) == 0x03) {
1837 		/* operation code is FORMAT WRITE -> index orientation */
1838 		LO_data[0] = 0xC3;
1839 
1840 	} else {
1841 		LO_data[0] = sense[7];	/* operation */
1842 	}
1843 
1844 	LO_data[1] = sense[8];	/* auxiliary */
1845 	LO_data[2] = sense[9];
1846 	LO_data[3] = sense[3];	/* count */
1847 	LO_data[4] = sense[29];	/* seek_addr.cyl */
1848 	LO_data[5] = sense[30];	/* seek_addr.cyl 2nd byte */
1849 	LO_data[7] = sense[31];	/* seek_addr.head 2nd byte */
1850 
1851 	memcpy(&(LO_data[8]), &(sense[11]), 8);
1852 
1853 	/* TIC to the failed ccw */
1854 	ccw = erp->cpaddr;	/* addr of DE ccw */
1855 	ccw++;			/* addr of LE ccw */
1856 	ccw++;			/* addr of TIC ccw */
1857 	ccw->cda = cpa;
1858 
1859 	erp->status = DASD_CQR_FILLED;
1860 
1861 	return erp;
1862 
1863 }				/* end dasd_3990_update_1B */
1864 
1865 /*
1866  * DASD_3990_ERP_COMPOUND_RETRY
1867  *
1868  * DESCRIPTION
1869  *   Handles the compound ERP action retry code.
1870  *   NOTE: At least one retry is done even if zero is specified
1871  *	   by the sense data. This makes enqueueing of the request
1872  *	   easier.
1873  *
1874  * PARAMETER
1875  *   sense		sense data of the actual error
1876  *   erp		pointer to the currently created ERP
1877  *
1878  * RETURN VALUES
1879  *   erp		modified ERP pointer
1880  *
1881  */
1882 static void
1883 dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
1884 {
1885 
1886 	switch (sense[25] & 0x03) {
1887 	case 0x00:		/* no not retry */
1888 		erp->retries = 1;
1889 		break;
1890 
1891 	case 0x01:		/* retry 2 times */
1892 		erp->retries = 2;
1893 		break;
1894 
1895 	case 0x02:		/* retry 10 times */
1896 		erp->retries = 10;
1897 		break;
1898 
1899 	case 0x03:		/* retry 256 times */
1900 		erp->retries = 256;
1901 		break;
1902 
1903 	default:
1904 		BUG();
1905 	}
1906 
1907 	erp->function = dasd_3990_erp_compound_retry;
1908 
1909 }				/* end dasd_3990_erp_compound_retry */
1910 
1911 /*
1912  * DASD_3990_ERP_COMPOUND_PATH
1913  *
1914  * DESCRIPTION
1915  *   Handles the compound ERP action for retry on alternate
1916  *   channel path.
1917  *
1918  * PARAMETER
1919  *   sense		sense data of the actual error
1920  *   erp		pointer to the currently created ERP
1921  *
1922  * RETURN VALUES
1923  *   erp		modified ERP pointer
1924  *
1925  */
1926 static void
1927 dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
1928 {
1929 	if (sense[25] & DASD_SENSE_BIT_3) {
1930 		dasd_3990_erp_alternate_path(erp);
1931 
1932 		if (erp->status == DASD_CQR_FAILED &&
1933 		    !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
1934 			/* reset the lpm and the status to be able to
1935 			 * try further actions. */
1936 			erp->lpm = dasd_path_get_opm(erp->startdev);
1937 			erp->status = DASD_CQR_NEED_ERP;
1938 		}
1939 	}
1940 
1941 	erp->function = dasd_3990_erp_compound_path;
1942 
1943 }				/* end dasd_3990_erp_compound_path */
1944 
1945 /*
1946  * DASD_3990_ERP_COMPOUND_CODE
1947  *
1948  * DESCRIPTION
1949  *   Handles the compound ERP action for retry code.
1950  *
1951  * PARAMETER
1952  *   sense		sense data of the actual error
1953  *   erp		pointer to the currently created ERP
1954  *
1955  * RETURN VALUES
1956  *   erp		NEW ERP pointer
1957  *
1958  */
1959 static struct dasd_ccw_req *
1960 dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense)
1961 {
1962 
1963 	if (sense[25] & DASD_SENSE_BIT_2) {
1964 
1965 		switch (sense[28]) {
1966 		case 0x17:
1967 			/* issue a Diagnostic Control command with an
1968 			 * Inhibit Write subcommand and controller modifier */
1969 			erp = dasd_3990_erp_DCTL(erp, 0x20);
1970 			break;
1971 
1972 		case 0x25:
1973 			/* wait for 5 seconds and retry again */
1974 			erp->retries = 1;
1975 
1976 			dasd_3990_erp_block_queue (erp, 5*HZ);
1977 			break;
1978 
1979 		default:
1980 			/* should not happen - continue */
1981 			break;
1982 		}
1983 	}
1984 
1985 	erp->function = dasd_3990_erp_compound_code;
1986 
1987 	return erp;
1988 
1989 }				/* end dasd_3990_erp_compound_code */
1990 
1991 /*
1992  * DASD_3990_ERP_COMPOUND_CONFIG
1993  *
1994  * DESCRIPTION
1995  *   Handles the compound ERP action for configuration
1996  *   dependent error.
1997  *   Note: duplex handling is not implemented (yet).
1998  *
1999  * PARAMETER
2000  *   sense		sense data of the actual error
2001  *   erp		pointer to the currently created ERP
2002  *
2003  * RETURN VALUES
2004  *   erp		modified ERP pointer
2005  *
2006  */
2007 static void
2008 dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense)
2009 {
2010 
2011 	if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) {
2012 
2013 		/* set to suspended duplex state then restart
2014 		   internal error 05 - Set device to suspended duplex state
2015 		   should be done */
2016 		struct dasd_device *device = erp->startdev;
2017 		dev_err(&device->cdev->dev,
2018 			"An error occurred in the DASD device driver, "
2019 			"reason=%s\n", "05");
2020 
2021 	}
2022 
2023 	erp->function = dasd_3990_erp_compound_config;
2024 
2025 }				/* end dasd_3990_erp_compound_config */
2026 
2027 /*
2028  * DASD_3990_ERP_COMPOUND
2029  *
2030  * DESCRIPTION
2031  *   Does the further compound program action if
2032  *   compound retry was not successful.
2033  *
2034  * PARAMETER
2035  *   sense		sense data of the actual error
2036  *   erp		pointer to the current (failed) ERP
2037  *
2038  * RETURN VALUES
2039  *   erp		(additional) ERP pointer
2040  *
2041  */
2042 static struct dasd_ccw_req *
2043 dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense)
2044 {
2045 
2046 	if ((erp->function == dasd_3990_erp_compound_retry) &&
2047 	    (erp->status == DASD_CQR_NEED_ERP)) {
2048 
2049 		dasd_3990_erp_compound_path(erp, sense);
2050 	}
2051 
2052 	if ((erp->function == dasd_3990_erp_compound_path) &&
2053 	    (erp->status == DASD_CQR_NEED_ERP)) {
2054 
2055 		erp = dasd_3990_erp_compound_code(erp, sense);
2056 	}
2057 
2058 	if ((erp->function == dasd_3990_erp_compound_code) &&
2059 	    (erp->status == DASD_CQR_NEED_ERP)) {
2060 
2061 		dasd_3990_erp_compound_config(erp, sense);
2062 	}
2063 
2064 	/* if no compound action ERP specified, the request failed */
2065 	if (erp->status == DASD_CQR_NEED_ERP)
2066 		erp->status = DASD_CQR_FAILED;
2067 
2068 	return erp;
2069 
2070 }				/* end dasd_3990_erp_compound */
2071 
2072 /*
2073  *DASD_3990_ERP_HANDLE_SIM
2074  *
2075  *DESCRIPTION
2076  *  inspects the SIM SENSE data and starts an appropriate action
2077  *
2078  * PARAMETER
2079  *   sense	   sense data of the actual error
2080  *
2081  * RETURN VALUES
2082  *   none
2083  */
2084 void
2085 dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense)
2086 {
2087 	/* print message according to log or message to operator mode */
2088 	if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) {
2089 		/* print SIM SRC from RefCode */
2090 		dev_err(&device->cdev->dev, "SIM - SRC: "
2091 			    "%02x%02x%02x%02x\n", sense[22],
2092 			    sense[23], sense[11], sense[12]);
2093 	} else if (sense[24] & DASD_SIM_LOG) {
2094 		/* print SIM SRC Refcode */
2095 		dev_warn(&device->cdev->dev, "log SIM - SRC: "
2096 			    "%02x%02x%02x%02x\n", sense[22],
2097 			    sense[23], sense[11], sense[12]);
2098 	}
2099 }
2100 
2101 /*
2102  * DASD_3990_ERP_INSPECT_32
2103  *
2104  * DESCRIPTION
2105  *   Does a detailed inspection of the 32 byte sense data
2106  *   and sets up a related error recovery action.
2107  *
2108  * PARAMETER
2109  *   sense		sense data of the actual error
2110  *   erp		pointer to the currently created default ERP
2111  *
2112  * RETURN VALUES
2113  *   erp_filled		pointer to the ERP
2114  *
2115  */
2116 static struct dasd_ccw_req *
2117 dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
2118 {
2119 
2120 	struct dasd_device *device = erp->startdev;
2121 
2122 	erp->function = dasd_3990_erp_inspect_32;
2123 
2124 	/* check for SIM sense data */
2125 	if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)
2126 		dasd_3990_erp_handle_sim(device, sense);
2127 
2128 	if (sense[25] & DASD_SENSE_BIT_0) {
2129 
2130 		/* compound program action codes (byte25 bit 0 == '1') */
2131 		dasd_3990_erp_compound_retry(erp, sense);
2132 
2133 	} else {
2134 
2135 		/* single program action codes (byte25 bit 0 == '0') */
2136 		switch (sense[25]) {
2137 
2138 		case 0x00:	/* success - use default ERP for retries */
2139 			DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
2140 				    "ERP called for successful request"
2141 				    " - just retry");
2142 			break;
2143 
2144 		case 0x01:	/* fatal error */
2145 			dev_err(&device->cdev->dev,
2146 				    "ERP failed for the DASD\n");
2147 
2148 			erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2149 			break;
2150 
2151 		case 0x02:	/* intervention required */
2152 		case 0x03:	/* intervention required during dual copy */
2153 			erp = dasd_3990_erp_int_req(erp);
2154 			break;
2155 
2156 		case 0x0F:  /* length mismatch during update write command
2157 			       internal error 08 - update write command error*/
2158 			dev_err(&device->cdev->dev, "An error occurred in the "
2159 				"DASD device driver, reason=%s\n", "08");
2160 
2161 			erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2162 			break;
2163 
2164 		case 0x10:  /* logging required for other channel program */
2165 			erp = dasd_3990_erp_action_10_32(erp, sense);
2166 			break;
2167 
2168 		case 0x15:	/* next track outside defined extend
2169 				   internal error 07 - The next track is not
2170 				   within the defined storage extent */
2171 			dev_err(&device->cdev->dev,
2172 				"An error occurred in the DASD device driver, "
2173 				"reason=%s\n", "07");
2174 
2175 			erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
2176 			break;
2177 
2178 		case 0x1B:	/* unexpected condition during write */
2179 
2180 			erp = dasd_3990_erp_action_1B_32(erp, sense);
2181 			break;
2182 
2183 		case 0x1C:	/* invalid data */
2184 			dev_emerg(&device->cdev->dev,
2185 				    "Data recovered during retry with PCI "
2186 				    "fetch mode active\n");
2187 
2188 			/* not possible to handle this situation in Linux */
2189 			panic
2190 			    ("Invalid data - No way to inform application "
2191 			     "about the possibly incorrect data");
2192 			break;
2193 
2194 		case 0x1D:	/* state-change pending */
2195 			DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2196 				    "A State change pending condition exists "
2197 				    "for the subsystem or device");
2198 
2199 			erp = dasd_3990_erp_action_4(erp, sense);
2200 			break;
2201 
2202 		case 0x1E:	/* busy */
2203 			DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2204 				    "Busy condition exists "
2205 				    "for the subsystem or device");
2206                         erp = dasd_3990_erp_action_4(erp, sense);
2207 			break;
2208 
2209 		default:	/* all others errors - default erp  */
2210 			break;
2211 		}
2212 	}
2213 
2214 	return erp;
2215 
2216 }				/* end dasd_3990_erp_inspect_32 */
2217 
2218 static void dasd_3990_erp_disable_path(struct dasd_device *device, __u8 lpum)
2219 {
2220 	int pos = pathmask_to_pos(lpum);
2221 
2222 	if (!(device->features & DASD_FEATURE_PATH_AUTODISABLE)) {
2223 		dev_err(&device->cdev->dev,
2224 			"Path %x.%02x (pathmask %02x) is operational despite excessive IFCCs\n",
2225 			device->path[pos].cssid, device->path[pos].chpid, lpum);
2226 		goto out;
2227 	}
2228 
2229 	/* no remaining path, cannot disable */
2230 	if (!(dasd_path_get_opm(device) & ~lpum)) {
2231 		dev_err(&device->cdev->dev,
2232 			"Last path %x.%02x (pathmask %02x) is operational despite excessive IFCCs\n",
2233 			device->path[pos].cssid, device->path[pos].chpid, lpum);
2234 		goto out;
2235 	}
2236 
2237 	dev_err(&device->cdev->dev,
2238 		"Path %x.%02x (pathmask %02x) is disabled - IFCC threshold exceeded\n",
2239 		device->path[pos].cssid, device->path[pos].chpid, lpum);
2240 	dasd_path_remove_opm(device, lpum);
2241 	dasd_path_add_ifccpm(device, lpum);
2242 
2243 out:
2244 	device->path[pos].errorclk = 0;
2245 	atomic_set(&device->path[pos].error_count, 0);
2246 }
2247 
2248 static void dasd_3990_erp_account_error(struct dasd_ccw_req *erp)
2249 {
2250 	struct dasd_device *device = erp->startdev;
2251 	__u8 lpum = erp->refers->irb.esw.esw1.lpum;
2252 	int pos = pathmask_to_pos(lpum);
2253 	unsigned long clk;
2254 
2255 	if (!device->path_thrhld)
2256 		return;
2257 
2258 	clk = get_tod_clock();
2259 	/*
2260 	 * check if the last error is longer ago than the timeout,
2261 	 * if so reset error state
2262 	 */
2263 	if ((tod_to_ns(clk - device->path[pos].errorclk) / NSEC_PER_SEC)
2264 	    >= device->path_interval) {
2265 		atomic_set(&device->path[pos].error_count, 0);
2266 		device->path[pos].errorclk = 0;
2267 	}
2268 	atomic_inc(&device->path[pos].error_count);
2269 	device->path[pos].errorclk = clk;
2270 	/* threshold exceeded disable path if possible */
2271 	if (atomic_read(&device->path[pos].error_count) >=
2272 	    device->path_thrhld)
2273 		dasd_3990_erp_disable_path(device, lpum);
2274 }
2275 
2276 /*
2277  *****************************************************************************
2278  * main ERP control functions (24 and 32 byte sense)
2279  *****************************************************************************
2280  */
2281 
2282 /*
2283  * DASD_3990_ERP_CONTROL_CHECK
2284  *
2285  * DESCRIPTION
2286  *   Does a generic inspection if a control check occurred and sets up
2287  *   the related error recovery procedure
2288  *
2289  * PARAMETER
2290  *   erp		pointer to the currently created default ERP
2291  *
2292  * RETURN VALUES
2293  *   erp_filled		pointer to the erp
2294  */
2295 
2296 static struct dasd_ccw_req *
2297 dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
2298 {
2299 	struct dasd_device *device = erp->startdev;
2300 
2301 	if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK
2302 					   | SCHN_STAT_CHN_CTRL_CHK)) {
2303 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2304 			    "channel or interface control check");
2305 		dasd_3990_erp_account_error(erp);
2306 		erp = dasd_3990_erp_action_4(erp, NULL);
2307 	}
2308 	return erp;
2309 }
2310 
2311 /*
2312  * DASD_3990_ERP_INSPECT
2313  *
2314  * DESCRIPTION
2315  *   Does a detailed inspection for sense data by calling either
2316  *   the 24-byte or the 32-byte inspection routine.
2317  *
2318  * PARAMETER
2319  *   erp		pointer to the currently created default ERP
2320  * RETURN VALUES
2321  *   erp_new		contens was possibly modified
2322  */
2323 static struct dasd_ccw_req *
2324 dasd_3990_erp_inspect(struct dasd_ccw_req *erp)
2325 {
2326 
2327 	struct dasd_ccw_req *erp_new = NULL;
2328 	char *sense;
2329 
2330 	/* if this problem occurred on an alias retry on base */
2331 	erp_new = dasd_3990_erp_inspect_alias(erp);
2332 	if (erp_new)
2333 		return erp_new;
2334 
2335 	/* sense data are located in the refers record of the
2336 	 * already set up new ERP !
2337 	 * check if concurrent sens is available
2338 	 */
2339 	sense = dasd_get_sense(&erp->refers->irb);
2340 	if (!sense)
2341 		erp_new = dasd_3990_erp_control_check(erp);
2342 	/* distinguish between 24 and 32 byte sense data */
2343 	else if (sense[27] & DASD_SENSE_BIT_0) {
2344 
2345 		/* inspect the 24 byte sense data */
2346 		erp_new = dasd_3990_erp_inspect_24(erp, sense);
2347 
2348 	} else {
2349 
2350 		/* inspect the 32 byte sense data */
2351 		erp_new = dasd_3990_erp_inspect_32(erp, sense);
2352 
2353 	}	/* end distinguish between 24 and 32 byte sense data */
2354 
2355 	return erp_new;
2356 }
2357 
2358 /*
2359  * DASD_3990_ERP_ADD_ERP
2360  *
2361  * DESCRIPTION
2362  *   This function adds an additional request block (ERP) to the head of
2363  *   the given cqr (or erp).
2364  *   For a command mode cqr the erp is initialized as an default erp
2365  *   (retry TIC).
2366  *   For transport mode we make a copy of the original TCW (points to
2367  *   the original TCCB, TIDALs, etc.) but give it a fresh
2368  *   TSB so the original sense data will not be changed.
2369  *
2370  * PARAMETER
2371  *   cqr		head of the current ERP-chain (or single cqr if
2372  *			first error)
2373  * RETURN VALUES
2374  *   erp		pointer to new ERP-chain head
2375  */
2376 static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr)
2377 {
2378 
2379 	struct dasd_device *device = cqr->startdev;
2380 	struct ccw1 *ccw;
2381 	struct dasd_ccw_req *erp;
2382 	int cplength, datasize;
2383 	struct tcw *tcw;
2384 	struct tsb *tsb;
2385 
2386 	if (cqr->cpmode == 1) {
2387 		cplength = 0;
2388 		/* TCW needs to be 64 byte aligned, so leave enough room */
2389 		datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb);
2390 	} else {
2391 		cplength = 2;
2392 		datasize = 0;
2393 	}
2394 
2395 	/* allocate additional request block */
2396 	erp = dasd_alloc_erp_request(cqr->magic,
2397 				     cplength, datasize, device);
2398 	if (IS_ERR(erp)) {
2399                 if (cqr->retries <= 0) {
2400 			DBF_DEV_EVENT(DBF_ERR, device, "%s",
2401 				    "Unable to allocate ERP request");
2402 			cqr->status = DASD_CQR_FAILED;
2403 			cqr->stopclk = get_tod_clock();
2404 		} else {
2405 			DBF_DEV_EVENT(DBF_ERR, device,
2406                                      "Unable to allocate ERP request "
2407 				     "(%i retries left)",
2408                                      cqr->retries);
2409 			dasd_block_set_timer(device->block, (HZ << 3));
2410                 }
2411 		return erp;
2412 	}
2413 
2414 	ccw = cqr->cpaddr;
2415 	if (cqr->cpmode == 1) {
2416 		/* make a shallow copy of the original tcw but set new tsb */
2417 		erp->cpmode = 1;
2418 		erp->cpaddr = PTR_ALIGN(erp->data, 64);
2419 		tcw = erp->cpaddr;
2420 		tsb = (struct tsb *) &tcw[1];
2421 		*tcw = *((struct tcw *)cqr->cpaddr);
2422 		tcw->tsb = (long)tsb;
2423 	} else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) {
2424 		/* PSF cannot be chained from NOOP/TIC */
2425 		erp->cpaddr = cqr->cpaddr;
2426 	} else {
2427 		/* initialize request with default TIC to current ERP/CQR */
2428 		ccw = erp->cpaddr;
2429 		ccw->cmd_code = CCW_CMD_NOOP;
2430 		ccw->flags = CCW_FLAG_CC;
2431 		ccw++;
2432 		ccw->cmd_code = CCW_CMD_TIC;
2433 		ccw->cda      = (long)(cqr->cpaddr);
2434 	}
2435 
2436 	erp->flags = cqr->flags;
2437 	erp->function = dasd_3990_erp_add_erp;
2438 	erp->refers   = cqr;
2439 	erp->startdev = device;
2440 	erp->memdev   = device;
2441 	erp->block    = cqr->block;
2442 	erp->magic    = cqr->magic;
2443 	erp->expires  = cqr->expires;
2444 	erp->retries  = 256;
2445 	erp->buildclk = get_tod_clock();
2446 	erp->status = DASD_CQR_FILLED;
2447 
2448 	return erp;
2449 }
2450 
2451 /*
2452  * DASD_3990_ERP_ADDITIONAL_ERP
2453  *
2454  * DESCRIPTION
2455  *   An additional ERP is needed to handle the current error.
2456  *   Add ERP to the head of the ERP-chain containing the ERP processing
2457  *   determined based on the sense data.
2458  *
2459  * PARAMETER
2460  *   cqr		head of the current ERP-chain (or single cqr if
2461  *			first error)
2462  *
2463  * RETURN VALUES
2464  *   erp		pointer to new ERP-chain head
2465  */
2466 static struct dasd_ccw_req *
2467 dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr)
2468 {
2469 
2470 	struct dasd_ccw_req *erp = NULL;
2471 
2472 	/* add erp and initialize with default TIC */
2473 	erp = dasd_3990_erp_add_erp(cqr);
2474 
2475 	if (IS_ERR(erp))
2476 		return erp;
2477 
2478 	/* inspect sense, determine specific ERP if possible */
2479 	if (erp != cqr) {
2480 
2481 		erp = dasd_3990_erp_inspect(erp);
2482 	}
2483 
2484 	return erp;
2485 
2486 }				/* end dasd_3990_erp_additional_erp */
2487 
2488 /*
2489  * DASD_3990_ERP_ERROR_MATCH
2490  *
2491  * DESCRIPTION
2492  *   Check if the device status of the given cqr is the same.
2493  *   This means that the failed CCW and the relevant sense data
2494  *   must match.
2495  *   I don't distinguish between 24 and 32 byte sense because in case of
2496  *   24 byte sense byte 25 and 27 is set as well.
2497  *
2498  * PARAMETER
2499  *   cqr1		first cqr, which will be compared with the
2500  *   cqr2		second cqr.
2501  *
2502  * RETURN VALUES
2503  *   match		'boolean' for match found
2504  *			returns 1 if match found, otherwise 0.
2505  */
2506 static int dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1,
2507 				     struct dasd_ccw_req *cqr2)
2508 {
2509 	char *sense1, *sense2;
2510 
2511 	if (cqr1->startdev != cqr2->startdev)
2512 		return 0;
2513 
2514 	sense1 = dasd_get_sense(&cqr1->irb);
2515 	sense2 = dasd_get_sense(&cqr2->irb);
2516 
2517 	/* one request has sense data, the other not -> no match, return 0 */
2518 	if (!sense1 != !sense2)
2519 		return 0;
2520 	/* no sense data in both cases -> check cstat for IFCC */
2521 	if (!sense1 && !sense2)	{
2522 		if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2523 						    SCHN_STAT_CHN_CTRL_CHK)) ==
2524 		    (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
2525 						    SCHN_STAT_CHN_CTRL_CHK)))
2526 			return 1; /* match with ifcc*/
2527 	}
2528 	/* check sense data; byte 0-2,25,27 */
2529 	if (!(sense1 && sense2 &&
2530 	      (memcmp(sense1, sense2, 3) == 0) &&
2531 	      (sense1[27] == sense2[27]) &&
2532 	      (sense1[25] == sense2[25]))) {
2533 
2534 		return 0;	/* sense doesn't match */
2535 	}
2536 
2537 	return 1;		/* match */
2538 
2539 }				/* end dasd_3990_erp_error_match */
2540 
2541 /*
2542  * DASD_3990_ERP_IN_ERP
2543  *
2544  * DESCRIPTION
2545  *   check if the current error already happened before.
2546  *   quick exit if current cqr is not an ERP (cqr->refers=NULL)
2547  *
2548  * PARAMETER
2549  *   cqr		failed cqr (either original cqr or already an erp)
2550  *
2551  * RETURN VALUES
2552  *   erp		erp-pointer to the already defined error
2553  *			recovery procedure OR
2554  *			NULL if a 'new' error occurred.
2555  */
2556 static struct dasd_ccw_req *
2557 dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr)
2558 {
2559 
2560 	struct dasd_ccw_req *erp_head = cqr,	/* save erp chain head */
2561 	*erp_match = NULL;	/* save erp chain head */
2562 	int match = 0;		/* 'boolean' for matching error found */
2563 
2564 	if (cqr->refers == NULL) {	/* return if not in erp */
2565 		return NULL;
2566 	}
2567 
2568 	/* check the erp/cqr chain for current error */
2569 	do {
2570 		match = dasd_3990_erp_error_match(erp_head, cqr->refers);
2571 		erp_match = cqr;	/* save possible matching erp  */
2572 		cqr = cqr->refers;	/* check next erp/cqr in queue */
2573 
2574 	} while ((cqr->refers != NULL) && (!match));
2575 
2576 	if (!match) {
2577 		return NULL;	/* no match was found */
2578 	}
2579 
2580 	return erp_match;	/* return address of matching erp */
2581 
2582 }				/* END dasd_3990_erp_in_erp */
2583 
2584 /*
2585  * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
2586  *
2587  * DESCRIPTION
2588  *   No retry is left for the current ERP. Check what has to be done
2589  *   with the ERP.
2590  *     - do further defined ERP action or
2591  *     - wait for interrupt or
2592  *     - exit with permanent error
2593  *
2594  * PARAMETER
2595  *   erp		ERP which is in progress with no retry left
2596  *
2597  * RETURN VALUES
2598  *   erp		modified/additional ERP
2599  */
2600 static struct dasd_ccw_req *
2601 dasd_3990_erp_further_erp(struct dasd_ccw_req *erp)
2602 {
2603 
2604 	struct dasd_device *device = erp->startdev;
2605 	char *sense = dasd_get_sense(&erp->irb);
2606 
2607 	/* check for 24 byte sense ERP */
2608 	if ((erp->function == dasd_3990_erp_bus_out) ||
2609 	    (erp->function == dasd_3990_erp_action_1) ||
2610 	    (erp->function == dasd_3990_erp_action_4)) {
2611 
2612 		erp = dasd_3990_erp_action_1(erp);
2613 
2614 	} else if (erp->function == dasd_3990_erp_action_1_sec) {
2615 		erp = dasd_3990_erp_action_1_sec(erp);
2616 	} else if (erp->function == dasd_3990_erp_action_5) {
2617 
2618 		/* retries have not been successful */
2619 		/* prepare erp for retry on different channel path */
2620 		erp = dasd_3990_erp_action_1(erp);
2621 
2622 		if (sense && !(sense[2] & DASD_SENSE_BIT_0)) {
2623 
2624 			/* issue a Diagnostic Control command with an
2625 			 * Inhibit Write subcommand */
2626 
2627 			switch (sense[25]) {
2628 			case 0x17:
2629 			case 0x57:{	/* controller */
2630 					erp = dasd_3990_erp_DCTL(erp, 0x20);
2631 					break;
2632 				}
2633 			case 0x18:
2634 			case 0x58:{	/* channel path */
2635 					erp = dasd_3990_erp_DCTL(erp, 0x40);
2636 					break;
2637 				}
2638 			case 0x19:
2639 			case 0x59:{	/* storage director */
2640 					erp = dasd_3990_erp_DCTL(erp, 0x80);
2641 					break;
2642 				}
2643 			default:
2644 				DBF_DEV_EVENT(DBF_WARNING, device,
2645 					    "invalid subcommand modifier 0x%x "
2646 					    "for Diagnostic Control Command",
2647 					    sense[25]);
2648 			}
2649 		}
2650 
2651 		/* check for 32 byte sense ERP */
2652 	} else if (sense &&
2653 		   ((erp->function == dasd_3990_erp_compound_retry) ||
2654 		    (erp->function == dasd_3990_erp_compound_path) ||
2655 		    (erp->function == dasd_3990_erp_compound_code) ||
2656 		    (erp->function == dasd_3990_erp_compound_config))) {
2657 
2658 		erp = dasd_3990_erp_compound(erp, sense);
2659 
2660 	} else {
2661 		/*
2662 		 * No retry left and no additional special handling
2663 		 * necessary
2664 		 */
2665 		dev_err(&device->cdev->dev,
2666 			"ERP %p has run out of retries and failed\n", erp);
2667 
2668 		erp->status = DASD_CQR_FAILED;
2669 	}
2670 
2671 	return erp;
2672 
2673 }				/* end dasd_3990_erp_further_erp */
2674 
2675 /*
2676  * DASD_3990_ERP_HANDLE_MATCH_ERP
2677  *
2678  * DESCRIPTION
2679  *   An error occurred again and an ERP has been detected which is already
2680  *   used to handle this error (e.g. retries).
2681  *   All prior ERP's are asumed to be successful and therefore removed
2682  *   from queue.
2683  *   If retry counter of matching erp is already 0, it is checked if further
2684  *   action is needed (besides retry) or if the ERP has failed.
2685  *
2686  * PARAMETER
2687  *   erp_head		first ERP in ERP-chain
2688  *   erp		ERP that handles the actual error.
2689  *			(matching erp)
2690  *
2691  * RETURN VALUES
2692  *   erp		modified/additional ERP
2693  */
2694 static struct dasd_ccw_req *
2695 dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head,
2696 			       struct dasd_ccw_req *erp)
2697 {
2698 
2699 	struct dasd_device *device = erp_head->startdev;
2700 	struct dasd_ccw_req *erp_done = erp_head;	/* finished req */
2701 	struct dasd_ccw_req *erp_free = NULL;	/* req to be freed */
2702 
2703 	/* loop over successful ERPs and remove them from chanq */
2704 	while (erp_done != erp) {
2705 
2706 		if (erp_done == NULL)	/* end of chain reached */
2707 			panic(PRINTK_HEADER "Programming error in ERP! The "
2708 			      "original request was lost\n");
2709 
2710 		/* remove the request from the device queue */
2711 		list_del(&erp_done->blocklist);
2712 
2713 		erp_free = erp_done;
2714 		erp_done = erp_done->refers;
2715 
2716 		/* free the finished erp request */
2717 		dasd_free_erp_request(erp_free, erp_free->memdev);
2718 
2719 	}			/* end while */
2720 
2721 	if (erp->retries > 0) {
2722 
2723 		char *sense = dasd_get_sense(&erp->refers->irb);
2724 
2725 		/* check for special retries */
2726 		if (sense && erp->function == dasd_3990_erp_action_4) {
2727 
2728 			erp = dasd_3990_erp_action_4(erp, sense);
2729 
2730 		} else if (sense &&
2731 			   erp->function == dasd_3990_erp_action_1B_32) {
2732 
2733 			erp = dasd_3990_update_1B(erp, sense);
2734 
2735 		} else if (sense && erp->function == dasd_3990_erp_int_req) {
2736 
2737 			erp = dasd_3990_erp_int_req(erp);
2738 
2739 		} else {
2740 			/* simple retry	  */
2741 			DBF_DEV_EVENT(DBF_DEBUG, device,
2742 				    "%i retries left for erp %p",
2743 				    erp->retries, erp);
2744 
2745 			/* handle the request again... */
2746 			erp->status = DASD_CQR_FILLED;
2747 		}
2748 
2749 	} else {
2750 		/* no retry left - check for further necessary action	 */
2751 		/* if no further actions, handle rest as permanent error */
2752 		erp = dasd_3990_erp_further_erp(erp);
2753 	}
2754 
2755 	return erp;
2756 
2757 }				/* end dasd_3990_erp_handle_match_erp */
2758 
2759 /*
2760  * DASD_3990_ERP_ACTION
2761  *
2762  * DESCRIPTION
2763  *   control routine for 3990 erp actions.
2764  *   Has to be called with the queue lock (namely the s390_irq_lock) acquired.
2765  *
2766  * PARAMETER
2767  *   cqr		failed cqr (either original cqr or already an erp)
2768  *
2769  * RETURN VALUES
2770  *   erp		erp-pointer to the head of the ERP action chain.
2771  *			This means:
2772  *			 - either a ptr to an additional ERP cqr or
2773  *			 - the original given cqr (which's status might
2774  *			   be modified)
2775  */
2776 struct dasd_ccw_req *
2777 dasd_3990_erp_action(struct dasd_ccw_req * cqr)
2778 {
2779 	struct dasd_ccw_req *erp = NULL;
2780 	struct dasd_device *device = cqr->startdev;
2781 	struct dasd_ccw_req *temp_erp = NULL;
2782 
2783 	if (device->features & DASD_FEATURE_ERPLOG) {
2784 		/* print current erp_chain */
2785 		dev_err(&device->cdev->dev,
2786 			    "ERP chain at BEGINNING of ERP-ACTION\n");
2787 		for (temp_erp = cqr;
2788 		     temp_erp != NULL; temp_erp = temp_erp->refers) {
2789 
2790 			dev_err(&device->cdev->dev,
2791 				    "ERP %p (%02x) refers to %p\n",
2792 				    temp_erp, temp_erp->status,
2793 				    temp_erp->refers);
2794 		}
2795 	}
2796 
2797 	/* double-check if current erp/cqr was successful */
2798 	if ((scsw_cstat(&cqr->irb.scsw) == 0x00) &&
2799 	    (scsw_dstat(&cqr->irb.scsw) ==
2800 	     (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
2801 
2802 		DBF_DEV_EVENT(DBF_DEBUG, device,
2803 			    "ERP called for successful request %p"
2804 			    " - NO ERP necessary", cqr);
2805 
2806 		cqr->status = DASD_CQR_DONE;
2807 
2808 		return cqr;
2809 	}
2810 
2811 	/* check if error happened before */
2812 	erp = dasd_3990_erp_in_erp(cqr);
2813 
2814 	if (erp == NULL) {
2815 		/* no matching erp found - set up erp */
2816 		erp = dasd_3990_erp_additional_erp(cqr);
2817 		if (IS_ERR(erp))
2818 			return erp;
2819 	} else {
2820 		/* matching erp found - set all leading erp's to DONE */
2821 		erp = dasd_3990_erp_handle_match_erp(cqr, erp);
2822 	}
2823 
2824 
2825 	/*
2826 	 * For path verification work we need to stick with the path that was
2827 	 * originally chosen so that the per path configuration data is
2828 	 * assigned correctly.
2829 	 */
2830 	if (test_bit(DASD_CQR_VERIFY_PATH, &erp->flags) && cqr->lpm) {
2831 		erp->lpm = cqr->lpm;
2832 	}
2833 
2834 	if (device->features & DASD_FEATURE_ERPLOG) {
2835 		/* print current erp_chain */
2836 		dev_err(&device->cdev->dev,
2837 			    "ERP chain at END of ERP-ACTION\n");
2838 		for (temp_erp = erp;
2839 		     temp_erp != NULL; temp_erp = temp_erp->refers) {
2840 
2841 			dev_err(&device->cdev->dev,
2842 				    "ERP %p (%02x) refers to %p\n",
2843 				    temp_erp, temp_erp->status,
2844 				    temp_erp->refers);
2845 		}
2846 	}
2847 
2848 	/* enqueue ERP request if it's a new one */
2849 	if (list_empty(&erp->blocklist)) {
2850 		cqr->status = DASD_CQR_IN_ERP;
2851 		/* add erp request before the cqr */
2852 		list_add_tail(&erp->blocklist, &cqr->blocklist);
2853 	}
2854 
2855 
2856 
2857 	return erp;
2858 
2859 }				/* end dasd_3990_erp_action */
2860