summaryrefslogtreecommitdiffstats
path: root/drivers/s390/cio/device_fsm.c
blob: 7756f324fb6f4e02169072d18040853252a8f8fe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
/*
 * drivers/s390/cio/device_fsm.c
 * finite state machine for device handling
 *
 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
 *			 IBM Corporation
 *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/string.h>

#include <asm/ccwdev.h>
#include <asm/cio.h>

#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "chsc.h"
#include "ioasm.h"

int
device_is_online(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return 0;
	cdev = sch->dev.driver_data;
	return (cdev->private->state == DEV_STATE_ONLINE);
}

int
device_is_disconnected(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return 0;
	cdev = sch->dev.driver_data;
	return (cdev->private->state == DEV_STATE_DISCONNECTED ||
		cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
}

void
device_set_disconnected(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return;
	cdev = sch->dev.driver_data;
	ccw_device_set_timeout(cdev, 0);
	cdev->private->flags.fake_irb = 0;
	cdev->private->state = DEV_STATE_DISCONNECTED;
}

void
device_set_waiting(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return;
	cdev = sch->dev.driver_data;
	ccw_device_set_timeout(cdev, 10*HZ);
	cdev->private->state = DEV_STATE_WAIT4IO;
}

/*
 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
 */
static void
ccw_device_timeout(unsigned long data)
{
	struct ccw_device *cdev;

	cdev = (struct ccw_device *) data;
	spin_lock_irq(cdev->ccwlock);
	dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
	spin_unlock_irq(cdev->ccwlock);
}

/*
 * Set timeout
 */
void
ccw_device_set_timeout(struct ccw_device *cdev, int expires)
{
	if (expires == 0) {
		del_timer(&cdev->private->timer);
		return;
	}
	if (timer_pending(&cdev->private->timer)) {
		if (mod_timer(&cdev->private->timer, jiffies + expires))
			return;
	}
	cdev->private->timer.function = ccw_device_timeout;
	cdev->private->timer.data = (unsigned long) cdev;
	cdev->private->timer.expires = jiffies + expires;
	add_timer(&cdev->private->timer);
}

/* Kill any pending timers after machine check. */
void
device_kill_pending_timer(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return;
	cdev = sch->dev.driver_data;
	ccw_device_set_timeout(cdev, 0);
}

/*
 * Cancel running i/o. This is called repeatedly since halt/clear are
 * asynchronous operations. We do one try with cio_cancel, two tries
 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 * Returns 0 if device now idle, -ENODEV for device not operational and
 * -EBUSY if an interrupt is expected (either from halt/clear or from a
 * status pending).
 */
int
ccw_device_cancel_halt_clear(struct ccw_device *cdev)
{
	struct subchannel *sch;
	int ret;

	sch = to_subchannel(cdev->dev.parent);
	ret = stsch(sch->schid, &sch->schib);
	if (ret || !sch->schib.pmcw.dnv)
		return -ENODEV; 
	if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
		/* Not operational or no activity -> done. */
		return 0;
	/* Stage 1: cancel io. */
	if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
	    !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
		ret = cio_cancel(sch);
		if (ret != -EINVAL)
			return ret;
		/* cancel io unsuccessful. From now on it is asynchronous. */
		cdev->private->iretry = 3;	/* 3 halt retries. */
	}
	if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
		/* Stage 2: halt io. */
		if (cdev->private->iretry) {
			cdev->private->iretry--;
			ret = cio_halt(sch);
			if (ret != -EBUSY)
				return (ret == 0) ? -EBUSY : ret;
		}
		/* halt io unsuccessful. */
		cdev->private->iretry = 255;	/* 255 clear retries. */
	}
	/* Stage 3: clear io. */
	if (cdev->private->iretry) {
		cdev->private->iretry--;
		ret = cio_clear (sch);
		return (ret == 0) ? -EBUSY : ret;
	}
	panic("Can't stop i/o on subchannel.\n");
}

static int
ccw_device_handle_oper(struct ccw_device *cdev)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	cdev->private->flags.recog_done = 1;
	/*
	 * Check if cu type and device type still match. If
	 * not, it is certainly another device and we have to
	 * de- and re-register. Also check here for non-matching devno.
	 */
	if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
	    cdev->id.cu_model != cdev->private->senseid.cu_model ||
	    cdev->id.dev_type != cdev->private->senseid.dev_type ||
	    cdev->id.dev_model != cdev->private->senseid.dev_model ||
	    cdev->private->devno != sch->schib.pmcw.dev) {
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_do_unreg_rereg, (void *)cdev);
		queue_work(ccw_device_work, &cdev->private->kick_work);
		return 0;
	}
	cdev->private->flags.donotify = 1;
	return 1;
}

/*
 * The machine won't give us any notification by machine check if a chpid has
 * been varied online on the SE so we have to find out by magic (i. e. driving
 * the channel subsystem to device selection and updating our path masks).
 */
static inline void
__recover_lost_chpids(struct subchannel *sch, int old_lpm)
{
	int mask, i;

	for (i = 0; i<8; i++) {
		mask = 0x80 >> i;
		if (!(sch->lpm & mask))
			continue;
		if (old_lpm & mask)
			continue;
		chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
	}
}

/*
 * Stop device recognition.
 */
static void
ccw_device_recog_done(struct ccw_device *cdev, int state)
{
	struct subchannel *sch;
	int notify, old_lpm, same_dev;

	sch = to_subchannel(cdev->dev.parent);

	ccw_device_set_timeout(cdev, 0);
	cio_disable_subchannel(sch);
	/*
	 * Now that we tried recognition, we have performed device selection
	 * through ssch() and the path information is up to date.
	 */
	old_lpm = sch->lpm;
	stsch(sch->schid, &sch->schib);
	sch->lpm = sch->schib.pmcw.pim &
		sch->schib.pmcw.pam &
		sch->schib.pmcw.pom &
		sch->opm;
	/* Check since device may again have become not operational. */
	if (!sch->schib.pmcw.dnv)
		state = DEV_STATE_NOT_OPER;
	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
		/* Force reprobe on all chpids. */
		old_lpm = 0;
	if (sch->lpm != old_lpm)
		__recover_lost_chpids(sch, old_lpm);
	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
		if (state == DEV_STATE_NOT_OPER) {
			cdev->private->flags.recog_done = 1;
			cdev->private->state = DEV_STATE_DISCONNECTED;
			return;
		}
		/* Boxed devices don't need extra treatment. */
	}
	notify = 0;
	same_dev = 0; /* Keep the compiler quiet... */
	switch (state) {
	case DEV_STATE_NOT_OPER:
		CIO_DEBUG(KERN_WARNING, 2,
			  "SenseID : unknown device %04x on subchannel "
			  "0.%x.%04x\n", cdev->private->devno,
			  sch->schid.ssid, sch->schid.sch_no);
		break;
	case DEV_STATE_OFFLINE:
		if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
			same_dev = ccw_device_handle_oper(cdev);
			notify = 1;
		}
		/* fill out sense information */
		memset(&cdev->id, 0, sizeof(cdev->id));
		cdev->id.cu_type   = cdev->private->senseid.cu_type;
		cdev->id.cu_model  = cdev->private->senseid.cu_model;
		cdev->id.dev_type  = cdev->private->senseid.dev_type;
		cdev->id.dev_model = cdev->private->senseid.dev_model;
		if (notify) {
			cdev->private->state = DEV_STATE_OFFLINE;
			if (same_dev) {
				/* Get device online again. */
				ccw_device_online(cdev);
				wake_up(&cdev->private->wait_q);
			}
			return;
		}
		/* Issue device info message. */
		CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
			  "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
			  "%04X/%02X\n",
			  cdev->private->ssid, cdev->private->devno,
			  cdev->id.cu_type, cdev->id.cu_model,
			  cdev->id.dev_type, cdev->id.dev_model);
		break;
	case DEV_STATE_BOXED:
		CIO_DEBUG(KERN_WARNING, 2,
			  "SenseID : boxed device %04x on subchannel "
			  "0.%x.%04x\n", cdev->private->devno,
			  sch->schid.ssid, sch->schid.sch_no);
		break;
	}
	cdev->private->state = state;
	io_subchannel_recog_done(cdev);
	if (state != DEV_STATE_NOT_OPER)
		wake_up(&cdev->private->wait_q);
}

/*
 * Function called from device_id.c after sense id has completed.
 */
void
ccw_device_sense_id_done(struct ccw_device *cdev, int err)
{
	switch (err) {
	case 0:
		ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
		break;
	case -ETIME:		/* Sense id stopped by timeout. */
		ccw_device_recog_done(cdev, DEV_STATE_BOXED);
		break;
	default:
		ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
		break;
	}
}

static void
ccw_device_oper_notify(void *data)
{
	struct ccw_device *cdev;
	struct subchannel *sch;
	int ret;

	cdev = (struct ccw_device *)data;
	sch = to_subchannel(cdev->dev.parent);
	ret = (sch->driver && sch->driver->notify) ?
		sch->driver->notify(&sch->dev, CIO_OPER) : 0;
	if (!ret)
		/* Driver doesn't want device back. */
		ccw_device_do_unreg_rereg((void *)cdev);
	else {
		/* Reenable channel measurements, if needed. */
		cmf_reenable(cdev);
		wake_up(&cdev->private->wait_q);
	}
}

/*
 * Finished with online/offline processing.
 */
static void
ccw_device_done(struct ccw_device *cdev, int state)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);

	if (state != DEV_STATE_ONLINE)
		cio_disable_subchannel(sch);

	/* Reset device status. */
	memset(&cdev->private->irb, 0, sizeof(struct irb));

	cdev->private->state = state;


	if (state == DEV_STATE_BOXED)
		CIO_DEBUG(KERN_WARNING, 2,
			  "Boxed device %04x on subchannel %04x\n",
			  cdev->private->devno, sch->schid.sch_no);

	if (cdev->private->flags.donotify) {
		cdev->private->flags.donotify = 0;
		PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
			     (void *)cdev);
		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
	}
	wake_up(&cdev->private->wait_q);

	if (css_init_done && state != DEV_STATE_ONLINE)
		put_device (&cdev->dev);
}

static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
{
	char *c1;
	char *c2;

	c1 = (char *)p1;
	c2 = (char *)p2;

	return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
}

static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
{
	int i;
	int last;

	last = 0;
	for (i = 0; i < 8; i++) {
		if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
			/* No PGID yet */
			continue;
		if (cdev->private->pgid[last].inf.ps.state1 ==
		    SNID_STATE1_RESET) {
			/* First non-zero PGID */
			last = i;
			continue;
		}
		if (cmp_pgid(&cdev->private->pgid[i],
			     &cdev->private->pgid[last]) == 0)
			/* Non-conflicting PGIDs */
			continue;

		/* PGID mismatch, can't pathgroup. */
		CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
			      "0.%x.%04x, can't pathgroup\n",
			      cdev->private->ssid, cdev->private->devno);
		cdev->private->options.pgroup = 0;
		return;
	}
	if (cdev->private->pgid[last].inf.ps.state1 ==
	    SNID_STATE1_RESET)
		/* No previous pgid found */
		memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
		       sizeof(struct pgid));
	else
		/* Use existing pgid */
		memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
		       sizeof(struct pgid));
}

/*
 * Function called from device_pgid.c after sense path ground has completed.
 */
void
ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	switch (err) {
	case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
		cdev->private->options.pgroup = 0;
		break;
	case 0: /* success */
	case -EACCES: /* partial success, some paths not operational */
		/* Check if all pgids are equal or 0. */
		__ccw_device_get_common_pgid(cdev);
		break;
	case -ETIME:		/* Sense path group id stopped by timeout. */
	case -EUSERS:		/* device is reserved for someone else. */
		ccw_device_done(cdev, DEV_STATE_BOXED);
		return;
	default:
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		return;
	}
	/* Start Path Group verification. */
	sch->vpm = 0;	/* Start with no path groups set. */
	cdev->private->state = DEV_STATE_VERIFY;
	ccw_device_verify_start(cdev);
}

/*
 * Start device recognition.
 */
int
ccw_device_recognition(struct ccw_device *cdev)
{
	struct subchannel *sch;
	int ret;

	if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
	    (cdev->private->state != DEV_STATE_BOXED))
		return -EINVAL;
	sch = to_subchannel(cdev->dev.parent);
	ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
	if (ret != 0)
		/* Couldn't enable the subchannel for i/o. Sick device. */
		return ret;

	/* After 60s the device recognition is considered to have failed. */
	ccw_device_set_timeout(cdev, 60*HZ);

	/*
	 * We used to start here with a sense pgid to find out whether a device
	 * is locked by someone else. Unfortunately, the sense pgid command
	 * code has other meanings on devices predating the path grouping
	 * algorithm, so we start with sense id and box the device after an
	 * timeout (or if sense pgid during path verification detects the device
	 * is locked, as may happen on newer devices).
	 */
	cdev->private->flags.recog_done = 0;
	cdev->private->state = DEV_STATE_SENSE_ID;
	ccw_device_sense_id_start(cdev);
	return 0;
}

/*
 * Handle timeout in device recognition.
 */
static void
ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	switch (ret) {
	case 0:
		ccw_device_recog_done(cdev, DEV_STATE_BOXED);
		break;
	case -ENODEV:
		ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
		break;
	default:
		ccw_device_set_timeout(cdev, 3*HZ);
	}
}


static void
ccw_device_nopath_notify(void *data)
{
	struct ccw_device *cdev;
	struct subchannel *sch;
	int ret;

	cdev = (struct ccw_device *)data;
	sch = to_subchannel(cdev->dev.parent);
	/* Extra sanity. */
	if (sch->lpm)
		return;
	ret = (sch->driver && sch->driver->notify) ?
		sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
	if (!ret) {
		if (get_device(&sch->dev)) {
			/* Driver doesn't want to keep device. */
			cio_disable_subchannel(sch);
			if (get_device(&cdev->dev)) {
				PREPARE_WORK(&cdev->private->kick_work,
					     ccw_device_call_sch_unregister,
					     (void *)cdev);
				queue_work(ccw_device_work,
					   &cdev->private->kick_work);
			} else
				put_device(&sch->dev);
		}
	} else {
		cio_disable_subchannel(sch);
		ccw_device_set_timeout(cdev, 0);
		cdev->private->flags.fake_irb = 0;
		cdev->private->state = DEV_STATE_DISCONNECTED;
		wake_up(&cdev->private->wait_q);
	}
}

void
ccw_device_verify_done(struct ccw_device *cdev, int err)
{
	cdev->private->flags.doverify = 0;
	switch (err) {
	case -EOPNOTSUPP: /* path grouping not supported, just set online. */
		cdev->private->options.pgroup = 0;
	case 0:
		ccw_device_done(cdev, DEV_STATE_ONLINE);
		/* Deliver fake irb to device driver, if needed. */
		if (cdev->private->flags.fake_irb) {
			memset(&cdev->private->irb, 0, sizeof(struct irb));
			cdev->private->irb.scsw.cc = 1;
			cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
			cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
			cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
			cdev->private->flags.fake_irb = 0;
			if (cdev->handler)
				cdev->handler(cdev, cdev->private->intparm,
					      &cdev->private->irb);
			memset(&cdev->private->irb, 0, sizeof(struct irb));
		}
		break;
	case -ETIME:
		ccw_device_done(cdev, DEV_STATE_BOXED);
		break;
	default:
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_nopath_notify, (void *)cdev);
		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		break;
	}
}

/*
 * Get device online.
 */
int
ccw_device_online(struct ccw_device *cdev)
{
	struct subchannel *sch;
	int ret;

	if ((cdev->private->state != DEV_STATE_OFFLINE) &&
	    (cdev->private->state != DEV_STATE_BOXED))
		return -EINVAL;
	sch = to_subchannel(cdev->dev.parent);
	if (css_init_done && !get_device(&cdev->dev))
		return -ENODEV;
	ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
	if (ret != 0) {
		/* Couldn't enable the subchannel for i/o. Sick device. */
		if (ret == -ENODEV)
			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
		return ret;
	}
	/* Do we want to do path grouping? */
	if (!cdev->private->options.pgroup) {
		/* Start initial path verification. */
		cdev->private->state = DEV_STATE_VERIFY;
		ccw_device_verify_start(cdev);
		return 0;
	}
	/* Do a SensePGID first. */
	cdev->private->state = DEV_STATE_SENSE_PGID;
	ccw_device_sense_pgid_start(cdev);
	return 0;
}

void
ccw_device_disband_done(struct ccw_device *cdev, int err)
{
	switch (err) {
	case 0:
		ccw_device_done(cdev, DEV_STATE_OFFLINE);
		break;
	case -ETIME:
		ccw_device_done(cdev, DEV_STATE_BOXED);
		break;
	default:
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		break;
	}
}

/*
 * Shutdown device.
 */
int
ccw_device_offline(struct ccw_device *cdev)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
		return -ENODEV;
	if (cdev->private->state != DEV_STATE_ONLINE) {
		if (sch->schib.scsw.actl != 0)
			return -EBUSY;
		return -EINVAL;
	}
	if (sch->schib.scsw.actl != 0)
		return -EBUSY;
	/* Are we doing path grouping? */
	if (!cdev->private->options.pgroup) {
		/* No, set state offline immediately. */
		sch->vpm = 0;
		ccw_device_done(cdev, DEV_STATE_OFFLINE);
		return 0;
	}
	/* Start Set Path Group commands. */
	cdev->private->state = DEV_STATE_DISBAND_PGID;
	ccw_device_disband_start(cdev);
	return 0;
}

/*
 * Handle timeout in device online/offline process.
 */
static void
ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	switch (ret) {
	case 0:
		ccw_device_done(cdev, DEV_STATE_BOXED);
		break;
	case -ENODEV:
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		break;
	default:
		ccw_device_set_timeout(cdev, 3*HZ);
	}
}

/*
 * Handle not oper event in device recognition.
 */
static void
ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
{
	ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
}

/*
 * Handle not operational event while offline.
 */
static void
ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	cdev->private->state = DEV_STATE_NOT_OPER;
	sch = to_subchannel(cdev->dev.parent);
	if (get_device(&cdev->dev)) {
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_call_sch_unregister, (void *)cdev);
		queue_work(ccw_device_work, &cdev->private->kick_work);
	}
	wake_up(&cdev->private->wait_q);
}

/*
 * Handle not operational event while online.
 */
static void
ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	if (sch->driver->notify &&
	    sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
			ccw_device_set_timeout(cdev, 0);
			cdev->private->flags.fake_irb = 0;
			cdev->private->state = DEV_STATE_DISCONNECTED;
			wake_up(&cdev->private->wait_q);
			return;
	}
	cdev->private->state = DEV_STATE_NOT_OPER;
	cio_disable_subchannel(sch);
	if (sch->schib.scsw.actl != 0) {
		// FIXME: not-oper indication to device driver ?
		ccw_device_call_handler(cdev);
	}
	if (get_device(&cdev->dev)) {
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_call_sch_unregister, (void *)cdev);
		queue_work(ccw_device_work, &cdev->private->kick_work);
	}
	wake_up(&cdev->private->wait_q);
}

/*
 * Handle path verification event.
 */
static void
ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	if (cdev->private->state == DEV_STATE_W4SENSE) {
		cdev->private->flags.doverify = 1;
		return;
	}
	sch = to_subchannel(cdev->dev.parent);
	/*
	 * Since we might not just be coming from an interrupt from the
	 * subchannel we have to update the schib.
	 */
	stsch(sch->schid, &sch->schib);

	if (sch->schib.scsw.actl != 0 ||
	    (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
	    (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
		/*
		 * No final status yet or final status not yet delivered
		 * to the device driver. Can't do path verfication now,
		 * delay until final status was delivered.
		 */
		cdev->private->flags.doverify = 1;
		return;
	}
	/* Device is idle, we can do the path verification. */
	cdev->private->state = DEV_STATE_VERIFY;
	ccw_device_verify_start(cdev);
}

/*
 * Got an interrupt for a normal io (state online).
 */
static void
ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;

	irb = (struct irb *) __LC_IRB;
	/* Check for unsolicited interrupt. */
	if ((irb->scsw.stctl ==
	    		(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
	    && (!irb->scsw.cc)) {
		if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
		    !irb->esw.esw0.erw.cons) {
			/* Unit check but no sense data. Need basic sense. */
			if (ccw_device_do_sense(cdev, irb) != 0)
				goto call_handler_unsol;
			memcpy(&cdev->private->irb, irb, sizeof(struct irb));
			cdev->private->state = DEV_STATE_W4SENSE;
			cdev->private->intparm = 0;
			return;
		}
call_handler_unsol:
		if (cdev->handler)
			cdev->handler (cdev, 0, irb);
		return;
	}
	/* Accumulate status and find out if a basic sense is needed. */
	ccw_device_accumulate_irb(cdev, irb);
	if (cdev->private->flags.dosense) {
		if (ccw_device_do_sense(cdev, irb) == 0) {
			cdev->private->state = DEV_STATE_W4SENSE;
		}
		return;
	}
	/* Call the handler. */
	if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
		/* Start delayed path verification. */
		ccw_device_online_verify(cdev, 0);
}

/*
 * Got an timeout in online state.
 */
static void
ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ccw_device_set_timeout(cdev, 0);
	ret = ccw_device_cancel_halt_clear(cdev);
	if (ret == -EBUSY) {
		ccw_device_set_timeout(cdev, 3*HZ);
		cdev->private->state = DEV_STATE_TIMEOUT_KILL;
		return;
	}
	if (ret == -ENODEV) {
		struct subchannel *sch;

		sch = to_subchannel(cdev->dev.parent);
		if (!sch->lpm) {
			PREPARE_WORK(&cdev->private->kick_work,
				     ccw_device_nopath_notify, (void *)cdev);
			queue_work(ccw_device_notify_work,
				   &cdev->private->kick_work);
		} else
			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
	} else if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
			      ERR_PTR(-ETIMEDOUT));
}

/*
 * Got an interrupt for a basic sense.
 */
void
ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;

	irb = (struct irb *) __LC_IRB;
	/* Check for unsolicited interrupt. */
	if (irb->scsw.stctl ==
	    		(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
		if (irb->scsw.cc == 1)
			/* Basic sense hasn't started. Try again. */
			ccw_device_do_sense(cdev, irb);
		else {
			printk("Huh? %s(%s): unsolicited interrupt...\n",
			       __FUNCTION__, cdev->dev.bus_id);
			if (cdev->handler)
				cdev->handler (cdev, 0, irb);
		}
		return;
	}
	/*
	 * Check if a halt or clear has been issued in the meanwhile. If yes,
	 * only deliver the halt/clear interrupt to the device driver as if it
	 * had killed the original request.
	 */
	if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
		cdev->private->flags.dosense = 0;
		memset(&cdev->private->irb, 0, sizeof(struct irb));
		ccw_device_accumulate_irb(cdev, irb);
		goto call_handler;
	}
	/* Add basic sense info to irb. */
	ccw_device_accumulate_basic_sense(cdev, irb);
	if (cdev->private->flags.dosense) {
		/* Another basic sense is needed. */
		ccw_device_do_sense(cdev, irb);
		return;
	}
call_handler:
	cdev->private->state = DEV_STATE_ONLINE;
	/* Call the handler. */
	if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
		/* Start delayed path verification. */
		ccw_device_online_verify(cdev, 0);
}

static void
ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;

	irb = (struct irb *) __LC_IRB;
	/* Accumulate status. We don't do basic sense. */
	ccw_device_accumulate_irb(cdev, irb);
	/* Remember to clear irb to avoid residuals. */
	memset(&cdev->private->irb, 0, sizeof(struct irb));
	/* Try to start delayed device verification. */
	ccw_device_online_verify(cdev, 0);
	/* Note: Don't call handler for cio initiated clear! */
}

static void
ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	ccw_device_set_timeout(cdev, 0);
	/* OK, i/o is dead now. Call interrupt handler. */
	cdev->private->state = DEV_STATE_ONLINE;
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
			      ERR_PTR(-ETIMEDOUT));
	if (!sch->lpm) {
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_nopath_notify, (void *)cdev);
		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
	} else if (cdev->private->flags.doverify)
		/* Start delayed path verification. */
		ccw_device_online_verify(cdev, 0);
}

static void
ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	if (ret == -EBUSY) {
		ccw_device_set_timeout(cdev, 3*HZ);
		return;
	}
	if (ret == -ENODEV) {
		struct subchannel *sch;

		sch = to_subchannel(cdev->dev.parent);
		if (!sch->lpm) {
			PREPARE_WORK(&cdev->private->kick_work,
				     ccw_device_nopath_notify, (void *)cdev);
			queue_work(ccw_device_notify_work,
				   &cdev->private->kick_work);
		} else
			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
		return;
	}
	//FIXME: Can we get here?
	cdev->private->state = DEV_STATE_ONLINE;
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
			      ERR_PTR(-ETIMEDOUT));
}

static void
ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;
	struct subchannel *sch;

	irb = (struct irb *) __LC_IRB;
	/*
	 * Accumulate status and find out if a basic sense is needed.
	 * This is fine since we have already adapted the lpm.
	 */
	ccw_device_accumulate_irb(cdev, irb);
	if (cdev->private->flags.dosense) {
		if (ccw_device_do_sense(cdev, irb) == 0) {
			cdev->private->state = DEV_STATE_W4SENSE;
		}
		return;
	}

	/* Iff device is idle, reset timeout. */
	sch = to_subchannel(cdev->dev.parent);
	if (!stsch(sch->schid, &sch->schib))
		if (sch->schib.scsw.actl == 0)
			ccw_device_set_timeout(cdev, 0);
	/* Call the handler. */
	ccw_device_call_handler(cdev);
	if (!sch->lpm) {
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_nopath_notify, (void *)cdev);
		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
	} else if (cdev->private->flags.doverify)
		ccw_device_online_verify(cdev, 0);
}

static void
ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	ccw_device_set_timeout(cdev, 0);
	ret = ccw_device_cancel_halt_clear(cdev);
	if (ret == -EBUSY) {
		ccw_device_set_timeout(cdev, 3*HZ);
		cdev->private->state = DEV_STATE_TIMEOUT_KILL;
		return;
	}
	if (ret == -ENODEV) {
		if (!sch->lpm) {
			PREPARE_WORK(&cdev->private->kick_work,
				     ccw_device_nopath_notify, (void *)cdev);
			queue_work(ccw_device_notify_work,
				   &cdev->private->kick_work);
		} else
			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
		return;
	}
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
			      ERR_PTR(-ETIMEDOUT));
	if (!sch->lpm) {
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_nopath_notify, (void *)cdev);
		queue_work(ccw_device_notify_work, &cdev->private->kick_work);
	} else if (cdev->private->flags.doverify)
		/* Start delayed path verification. */
		ccw_device_online_verify(cdev, 0);
}

static void
ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
{
	/* When the I/O has terminated, we have to start verification. */
	cdev->private->flags.doverify = 1;
}

static void
ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;

	switch (dev_event) {
	case DEV_EVENT_INTERRUPT:
		irb = (struct irb *) __LC_IRB;
		/* Check for unsolicited interrupt. */
		if ((irb->scsw.stctl ==
		     (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
		    (!irb->scsw.cc))
			/* FIXME: we should restart stlck here, but this
			 * is extremely unlikely ... */
			goto out_wakeup;

		ccw_device_accumulate_irb(cdev, irb);
		/* We don't care about basic sense etc. */
		break;
	default: /* timeout */
		break;
	}
out_wakeup:
	wake_up(&cdev->private->wait_q);
}

static void
ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
		/* Couldn't enable the subchannel for i/o. Sick device. */
		return;

	/* After 60s the device recognition is considered to have failed. */
	ccw_device_set_timeout(cdev, 60*HZ);

	cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
	ccw_device_sense_id_start(cdev);
}

void
device_trigger_reprobe(struct subchannel *sch)
{
	struct ccw_device *cdev;

	if (!sch->dev.driver_data)
		return;
	cdev = sch->dev.driver_data;
	if (cdev->private->state != DEV_STATE_DISCONNECTED)
		return;

	/* Update some values. */
	if (stsch(sch->schid, &sch->schib))
		return;

	/*
	 * The pim, pam, pom values may not be accurate, but they are the best
	 * we have before performing device selection :/
	 */
	sch->lpm = sch->schib.pmcw.pim &
		sch->schib.pmcw.pam &
		sch->schib.pmcw.pom &
		sch->opm;
	/* Re-set some bits in the pmcw that were lost. */
	sch->schib.pmcw.isc = 3;
	sch->schib.pmcw.csense = 1;
	sch->schib.pmcw.ena = 0;
	if ((sch->lpm & (sch->lpm - 1)) != 0)
		sch->schib.pmcw.mp = 1;
	sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
	/* We should also udate ssd info, but this has to wait. */
	ccw_device_start_id(cdev, 0);
}

static void
ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	/*
	 * An interrupt in state offline means a previous disable was not
	 * successful. Try again.
	 */
	cio_disable_subchannel(sch);
}

static void
ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
{
	retry_set_schib(cdev);
	cdev->private->state = DEV_STATE_ONLINE;
	dev_fsm_event(cdev, dev_event);
}

static void ccw_device_update_cmfblock(struct ccw_device *cdev,
				       enum dev_event dev_event)
{
	cmf_retry_copy_block(cdev);
	cdev->private->state = DEV_STATE_ONLINE;
	dev_fsm_event(cdev, dev_event);
}

static void
ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
{
	ccw_device_set_timeout(cdev, 0);
	if (dev_event == DEV_EVENT_NOTOPER)
		cdev->private->state = DEV_STATE_NOT_OPER;
	else
		cdev->private->state = DEV_STATE_OFFLINE;
	wake_up(&cdev->private->wait_q);
}

static void
ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	switch (ret) {
	case 0:
		cdev->private->state = DEV_STATE_OFFLINE;
		wake_up(&cdev->private->wait_q);
		break;
	case -ENODEV:
		cdev->private->state = DEV_STATE_NOT_OPER;
		wake_up(&cdev->private->wait_q);
		break;
	default:
		ccw_device_set_timeout(cdev, HZ/10);
	}
}

/*
 * No operation action. This is used e.g. to ignore a timeout event in
 * state offline.
 */
static void
ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
{
}

/*
 * Bug operation action. 
 */
static void
ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
{
	printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
	       cdev->private->state, dev_event);
	BUG();
}

/*
 * device statemachine
 */
fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
	[DEV_STATE_NOT_OPER] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_nop,
		[DEV_EVENT_INTERRUPT]	= ccw_device_bug,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_SENSE_PGID] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_pgid_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_SENSE_ID] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_recog_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_id_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_recog_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_OFFLINE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_offline_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_offline_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_VERIFY] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_verify_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_ONLINE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_online_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_online_verify,
	},
	[DEV_STATE_W4SENSE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_w4sense,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
		[DEV_EVENT_VERIFY]	= ccw_device_online_verify,
	},
	[DEV_STATE_DISBAND_PGID] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_disband_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_BOXED] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_offline_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_stlck_done,
		[DEV_EVENT_TIMEOUT]	= ccw_device_stlck_done,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	/* states to wait for i/o completion before doing something */
	[DEV_STATE_CLEAR_VERIFY] = {
		[DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_TIMEOUT_KILL] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_killing_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_killing_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop, //FIXME
	},
	[DEV_STATE_WAIT4IO] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_online_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_wait4io_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_wait4io_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_wait4io_verify,
	},
	[DEV_STATE_QUIESCE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_quiesce_done,
		[DEV_EVENT_INTERRUPT]	= ccw_device_quiesce_done,
		[DEV_EVENT_TIMEOUT]	= ccw_device_quiesce_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	/* special states for devices gone not operational */
	[DEV_STATE_DISCONNECTED] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_nop,
		[DEV_EVENT_INTERRUPT]	= ccw_device_start_id,
		[DEV_EVENT_TIMEOUT]	= ccw_device_bug,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_DISCONNECTED_SENSE_ID] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_recog_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_id_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_recog_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_CMFCHANGE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_change_cmfstate,
		[DEV_EVENT_INTERRUPT]	= ccw_device_change_cmfstate,
		[DEV_EVENT_TIMEOUT]	= ccw_device_change_cmfstate,
		[DEV_EVENT_VERIFY]	= ccw_device_change_cmfstate,
	},
	[DEV_STATE_CMFUPDATE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_update_cmfblock,
		[DEV_EVENT_INTERRUPT]	= ccw_device_update_cmfblock,
		[DEV_EVENT_TIMEOUT]	= ccw_device_update_cmfblock,
		[DEV_EVENT_VERIFY]	= ccw_device_update_cmfblock,
	},
};

/*
 * io_subchannel_irq is called for "real" interrupts or for status
 * pending conditions on msch.
 */
void
io_subchannel_irq (struct device *pdev)
{
	struct ccw_device *cdev;

	cdev = to_subchannel(pdev)->dev.driver_data;

	CIO_TRACE_EVENT (3, "IRQ");
	CIO_TRACE_EVENT (3, pdev->bus_id);
	if (cdev)
		dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
}

EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
OpenPOWER on IntegriCloud