summaryrefslogtreecommitdiffstats
path: root/drivers/s390/cio/chsc.c
blob: 4159c63a5fd2bbba9b9c2949fde8c56ba9030a89 (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
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
// SPDX-License-Identifier: GPL-2.0
/*
 *   S/390 common I/O routines -- channel subsystem call
 *
 *    Copyright IBM Corp. 1999,2012
 *    Author(s): Ingo Adlung (adlung@de.ibm.com)
 *		 Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Arnd Bergmann (arndb@de.ibm.com)
 */

#define KMSG_COMPONENT "cio"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pci.h>

#include <asm/cio.h>
#include <asm/chpid.h>
#include <asm/chsc.h>
#include <asm/crw.h>
#include <asm/isc.h>
#include <asm/ebcdic.h>

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

static void *sei_page;
static void *chsc_page;
static DEFINE_SPINLOCK(chsc_page_lock);

/**
 * chsc_error_from_response() - convert a chsc response to an error
 * @response: chsc response code
 *
 * Returns an appropriate Linux error code for @response.
 */
int chsc_error_from_response(int response)
{
	switch (response) {
	case 0x0001:
		return 0;
	case 0x0002:
	case 0x0003:
	case 0x0006:
	case 0x0007:
	case 0x0008:
	case 0x000a:
	case 0x0104:
		return -EINVAL;
	case 0x0004:
		return -EOPNOTSUPP;
	case 0x000b:
	case 0x0107:		/* "Channel busy" for the op 0x003d */
		return -EBUSY;
	case 0x0100:
	case 0x0102:
		return -ENOMEM;
	default:
		return -EIO;
	}
}
EXPORT_SYMBOL_GPL(chsc_error_from_response);

struct chsc_ssd_area {
	struct chsc_header request;
	u16 :10;
	u16 ssid:2;
	u16 :4;
	u16 f_sch;	  /* first subchannel */
	u16 :16;
	u16 l_sch;	  /* last subchannel */
	u32 :32;
	struct chsc_header response;
	u32 :32;
	u8 sch_valid : 1;
	u8 dev_valid : 1;
	u8 st	     : 3; /* subchannel type */
	u8 zeroes    : 3;
	u8  unit_addr;	  /* unit address */
	u16 devno;	  /* device number */
	u8 path_mask;
	u8 fla_valid_mask;
	u16 sch;	  /* subchannel */
	u8 chpid[8];	  /* chpids 0-7 */
	u16 fla[8];	  /* full link addresses 0-7 */
} __packed __aligned(PAGE_SIZE);

int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
{
	struct chsc_ssd_area *ssd_area;
	unsigned long flags;
	int ccode;
	int ret;
	int i;
	int mask;

	spin_lock_irqsave(&chsc_page_lock, flags);
	memset(chsc_page, 0, PAGE_SIZE);
	ssd_area = chsc_page;
	ssd_area->request.length = 0x0010;
	ssd_area->request.code = 0x0004;
	ssd_area->ssid = schid.ssid;
	ssd_area->f_sch = schid.sch_no;
	ssd_area->l_sch = schid.sch_no;

	ccode = chsc(ssd_area);
	/* Check response. */
	if (ccode > 0) {
		ret = (ccode == 3) ? -ENODEV : -EBUSY;
		goto out;
	}
	ret = chsc_error_from_response(ssd_area->response.code);
	if (ret != 0) {
		CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
			      schid.ssid, schid.sch_no,
			      ssd_area->response.code);
		goto out;
	}
	if (!ssd_area->sch_valid) {
		ret = -ENODEV;
		goto out;
	}
	/* Copy data */
	ret = 0;
	memset(ssd, 0, sizeof(struct chsc_ssd_info));
	if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
	    (ssd_area->st != SUBCHANNEL_TYPE_MSG))
		goto out;
	ssd->path_mask = ssd_area->path_mask;
	ssd->fla_valid_mask = ssd_area->fla_valid_mask;
	for (i = 0; i < 8; i++) {
		mask = 0x80 >> i;
		if (ssd_area->path_mask & mask) {
			chp_id_init(&ssd->chpid[i]);
			ssd->chpid[i].id = ssd_area->chpid[i];
		}
		if (ssd_area->fla_valid_mask & mask)
			ssd->fla[i] = ssd_area->fla[i];
	}
out:
	spin_unlock_irqrestore(&chsc_page_lock, flags);
	return ret;
}

/**
 * chsc_ssqd() - store subchannel QDIO data (SSQD)
 * @schid: id of the subchannel on which SSQD is performed
 * @ssqd: request and response block for SSQD
 *
 * Returns 0 on success.
 */
int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
{
	memset(ssqd, 0, sizeof(*ssqd));
	ssqd->request.length = 0x0010;
	ssqd->request.code = 0x0024;
	ssqd->first_sch = schid.sch_no;
	ssqd->last_sch = schid.sch_no;
	ssqd->ssid = schid.ssid;

	if (chsc(ssqd))
		return -EIO;

	return chsc_error_from_response(ssqd->response.code);
}
EXPORT_SYMBOL_GPL(chsc_ssqd);

/**
 * chsc_sadc() - set adapter device controls (SADC)
 * @schid: id of the subchannel on which SADC is performed
 * @scssc: request and response block for SADC
 * @summary_indicator_addr: summary indicator address
 * @subchannel_indicator_addr: subchannel indicator address
 *
 * Returns 0 on success.
 */
int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
	      u64 summary_indicator_addr, u64 subchannel_indicator_addr)
{
	memset(scssc, 0, sizeof(*scssc));
	scssc->request.length = 0x0fe0;
	scssc->request.code = 0x0021;
	scssc->operation_code = 0;

	scssc->summary_indicator_addr = summary_indicator_addr;
	scssc->subchannel_indicator_addr = subchannel_indicator_addr;

	scssc->ks = PAGE_DEFAULT_KEY >> 4;
	scssc->kc = PAGE_DEFAULT_KEY >> 4;
	scssc->isc = QDIO_AIRQ_ISC;
	scssc->schid = schid;

	/* enable the time delay disablement facility */
	if (css_general_characteristics.aif_tdd)
		scssc->word_with_d_bit = 0x10000000;

	if (chsc(scssc))
		return -EIO;

	return chsc_error_from_response(scssc->response.code);
}
EXPORT_SYMBOL_GPL(chsc_sadc);

static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
{
	spin_lock_irq(sch->lock);
	if (sch->driver && sch->driver->chp_event)
		if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
			goto out_unreg;
	spin_unlock_irq(sch->lock);
	return 0;

out_unreg:
	sch->lpm = 0;
	spin_unlock_irq(sch->lock);
	css_schedule_eval(sch->schid);
	return 0;
}

void chsc_chp_offline(struct chp_id chpid)
{
	struct channel_path *chp = chpid_to_chp(chpid);
	struct chp_link link;
	char dbf_txt[15];

	sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
	CIO_TRACE_EVENT(2, dbf_txt);

	if (chp_get_status(chpid) <= 0)
		return;
	memset(&link, 0, sizeof(struct chp_link));
	link.chpid = chpid;
	/* Wait until previous actions have settled. */
	css_wait_for_slow_path();

	mutex_lock(&chp->lock);
	chp_update_desc(chp);
	mutex_unlock(&chp->lock);

	for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
}

static int __s390_process_res_acc(struct subchannel *sch, void *data)
{
	spin_lock_irq(sch->lock);
	if (sch->driver && sch->driver->chp_event)
		sch->driver->chp_event(sch, data, CHP_ONLINE);
	spin_unlock_irq(sch->lock);

	return 0;
}

static void s390_process_res_acc(struct chp_link *link)
{
	char dbf_txt[15];

	sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
		link->chpid.id);
	CIO_TRACE_EVENT( 2, dbf_txt);
	if (link->fla != 0) {
		sprintf(dbf_txt, "fla%x", link->fla);
		CIO_TRACE_EVENT( 2, dbf_txt);
	}
	/* Wait until previous actions have settled. */
	css_wait_for_slow_path();
	/*
	 * I/O resources may have become accessible.
	 * Scan through all subchannels that may be concerned and
	 * do a validation on those.
	 * The more information we have (info), the less scanning
	 * will we have to do.
	 */
	for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
	css_schedule_reprobe();
}

struct chsc_sei_nt0_area {
	u8  flags;
	u8  vf;				/* validity flags */
	u8  rs;				/* reporting source */
	u8  cc;				/* content code */
	u16 fla;			/* full link address */
	u16 rsid;			/* reporting source id */
	u32 reserved1;
	u32 reserved2;
	/* ccdf has to be big enough for a link-incident record */
	u8  ccdf[PAGE_SIZE - 24 - 16];	/* content-code dependent field */
} __packed;

struct chsc_sei_nt2_area {
	u8  flags;			/* p and v bit */
	u8  reserved1;
	u8  reserved2;
	u8  cc;				/* content code */
	u32 reserved3[13];
	u8  ccdf[PAGE_SIZE - 24 - 56];	/* content-code dependent field */
} __packed;

#define CHSC_SEI_NT0	(1ULL << 63)
#define CHSC_SEI_NT2	(1ULL << 61)

struct chsc_sei {
	struct chsc_header request;
	u32 reserved1;
	u64 ntsm;			/* notification type mask */
	struct chsc_header response;
	u32 :24;
	u8 nt;
	union {
		struct chsc_sei_nt0_area nt0_area;
		struct chsc_sei_nt2_area nt2_area;
		u8 nt_area[PAGE_SIZE - 24];
	} u;
} __packed __aligned(PAGE_SIZE);

/*
 * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
 */

#define ND_VALIDITY_VALID	0
#define ND_VALIDITY_OUTDATED	1
#define ND_VALIDITY_INVALID	2

struct node_descriptor {
	/* Flags. */
	union {
		struct {
			u32 validity:3;
			u32 reserved:5;
		} __packed;
		u8 byte0;
	} __packed;

	/* Node parameters. */
	u32 params:24;

	/* Node ID. */
	char type[6];
	char model[3];
	char manufacturer[3];
	char plant[2];
	char seq[12];
	u16 tag;
} __packed;

/*
 * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 */

#define LIR_IQ_CLASS_INFO		0
#define LIR_IQ_CLASS_DEGRADED		1
#define LIR_IQ_CLASS_NOT_OPERATIONAL	2

struct lir {
	struct {
		u32 null:1;
		u32 reserved:3;
		u32 class:2;
		u32 reserved2:2;
	} __packed iq;
	u32 ic:8;
	u32 reserved:16;
	struct node_descriptor incident_node;
	struct node_descriptor attached_node;
	u8 reserved2[32];
} __packed;

#define PARAMS_LEN	10	/* PARAMS=xx,xxxxxx */
#define NODEID_LEN	35	/* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */

/* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
static char *store_ebcdic(char *dest, const char *src, unsigned long len,
			  char delim)
{
	memcpy(dest, src, len);
	EBCASC(dest, len);

	if (delim)
		dest[len++] = delim;

	return dest + len;
}

/* Format node ID and parameters for output in LIR log message. */
static void format_node_data(char *params, char *id, struct node_descriptor *nd)
{
	memset(params, 0, PARAMS_LEN);
	memset(id, 0, NODEID_LEN);

	if (nd->validity != ND_VALIDITY_VALID) {
		strncpy(params, "n/a", PARAMS_LEN - 1);
		strncpy(id, "n/a", NODEID_LEN - 1);
		return;
	}

	/* PARAMS=xx,xxxxxx */
	snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
	/* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
	id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
	id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
	id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
	id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
	id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
	sprintf(id, "%04X", nd->tag);
}

static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
{
	struct lir *lir = (struct lir *) &sei_area->ccdf;
	char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
	     aunodeid[NODEID_LEN];

	CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
		      sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);

	/* Ignore NULL Link Incident Records. */
	if (lir->iq.null)
		return;

	/* Inform user that a link requires maintenance actions because it has
	 * become degraded or not operational. Note that this log message is
	 * the primary intention behind a Link Incident Record. */

	format_node_data(iuparams, iunodeid, &lir->incident_node);
	format_node_data(auparams, aunodeid, &lir->attached_node);

	switch (lir->iq.class) {
	case LIR_IQ_CLASS_DEGRADED:
		pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
			"IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
			sei_area->rs, sei_area->rsid, lir->ic, iuparams,
			iunodeid, auparams, aunodeid);
		break;
	case LIR_IQ_CLASS_NOT_OPERATIONAL:
		pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
		       "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
		       sei_area->rs, sei_area->rsid, lir->ic, iuparams,
		       iunodeid, auparams, aunodeid);
		break;
	default:
		break;
	}
}

static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
{
	struct channel_path *chp;
	struct chp_link link;
	struct chp_id chpid;
	int status;

	CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
		      "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
	if (sei_area->rs != 4)
		return;
	chp_id_init(&chpid);
	chpid.id = sei_area->rsid;
	/* allocate a new channel path structure, if needed */
	status = chp_get_status(chpid);
	if (!status)
		return;

	if (status < 0) {
		chp_new(chpid);
	} else {
		chp = chpid_to_chp(chpid);
		mutex_lock(&chp->lock);
		chp_update_desc(chp);
		mutex_unlock(&chp->lock);
	}
	memset(&link, 0, sizeof(struct chp_link));
	link.chpid = chpid;
	if ((sei_area->vf & 0xc0) != 0) {
		link.fla = sei_area->fla;
		if ((sei_area->vf & 0xc0) == 0xc0)
			/* full link address */
			link.fla_mask = 0xffff;
		else
			/* link address */
			link.fla_mask = 0xff00;
	}
	s390_process_res_acc(&link);
}

static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
{
	struct channel_path *chp;
	struct chp_id chpid;
	u8 *data;
	int num;

	CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
	if (sei_area->rs != 0)
		return;
	data = sei_area->ccdf;
	chp_id_init(&chpid);
	for (num = 0; num <= __MAX_CHPID; num++) {
		if (!chp_test_bit(data, num))
			continue;
		chpid.id = num;

		CIO_CRW_EVENT(4, "Update information for channel path "
			      "%x.%02x\n", chpid.cssid, chpid.id);
		chp = chpid_to_chp(chpid);
		if (!chp) {
			chp_new(chpid);
			continue;
		}
		mutex_lock(&chp->lock);
		chp_update_desc(chp);
		mutex_unlock(&chp->lock);
	}
}

struct chp_config_data {
	u8 map[32];
	u8 op;
	u8 pc;
};

static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
{
	struct chp_config_data *data;
	struct chp_id chpid;
	int num;
	char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};

	CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
	if (sei_area->rs != 0)
		return;
	data = (struct chp_config_data *) &(sei_area->ccdf);
	chp_id_init(&chpid);
	for (num = 0; num <= __MAX_CHPID; num++) {
		if (!chp_test_bit(data->map, num))
			continue;
		chpid.id = num;
		pr_notice("Processing %s for channel path %x.%02x\n",
			  events[data->op], chpid.cssid, chpid.id);
		switch (data->op) {
		case 0:
			chp_cfg_schedule(chpid, 1);
			break;
		case 1:
			chp_cfg_schedule(chpid, 0);
			break;
		case 2:
			chp_cfg_cancel_deconfigure(chpid);
			break;
		}
	}
}

static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
{
	int ret;

	CIO_CRW_EVENT(4, "chsc: scm change notification\n");
	if (sei_area->rs != 7)
		return;

	ret = scm_update_information();
	if (ret)
		CIO_CRW_EVENT(0, "chsc: updating change notification"
			      " failed (rc=%d).\n", ret);
}

static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
{
	int ret;

	CIO_CRW_EVENT(4, "chsc: scm available information\n");
	if (sei_area->rs != 7)
		return;

	ret = scm_process_availability_information();
	if (ret)
		CIO_CRW_EVENT(0, "chsc: process availability information"
			      " failed (rc=%d).\n", ret);
}

static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
{
	switch (sei_area->cc) {
	case 1:
		zpci_event_error(sei_area->ccdf);
		break;
	case 2:
		zpci_event_availability(sei_area->ccdf);
		break;
	default:
		CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
			      sei_area->cc);
		break;
	}
}

static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
{
	/* which kind of information was stored? */
	switch (sei_area->cc) {
	case 1: /* link incident*/
		chsc_process_sei_link_incident(sei_area);
		break;
	case 2: /* i/o resource accessibility */
		chsc_process_sei_res_acc(sei_area);
		break;
	case 7: /* channel-path-availability information */
		chsc_process_sei_chp_avail(sei_area);
		break;
	case 8: /* channel-path-configuration notification */
		chsc_process_sei_chp_config(sei_area);
		break;
	case 12: /* scm change notification */
		chsc_process_sei_scm_change(sei_area);
		break;
	case 14: /* scm available notification */
		chsc_process_sei_scm_avail(sei_area);
		break;
	default: /* other stuff */
		CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
			      sei_area->cc);
		break;
	}

	/* Check if we might have lost some information. */
	if (sei_area->flags & 0x40) {
		CIO_CRW_EVENT(2, "chsc: event overflow\n");
		css_schedule_eval_all();
	}
}

static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
{
	static int ntsm_unsupported;

	while (true) {
		memset(sei, 0, sizeof(*sei));
		sei->request.length = 0x0010;
		sei->request.code = 0x000e;
		if (!ntsm_unsupported)
			sei->ntsm = ntsm;

		if (chsc(sei))
			break;

		if (sei->response.code != 0x0001) {
			CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
				      sei->response.code, sei->ntsm);

			if (sei->response.code == 3 && sei->ntsm) {
				/* Fallback for old firmware. */
				ntsm_unsupported = 1;
				continue;
			}
			break;
		}

		CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
		switch (sei->nt) {
		case 0:
			chsc_process_sei_nt0(&sei->u.nt0_area);
			break;
		case 2:
			chsc_process_sei_nt2(&sei->u.nt2_area);
			break;
		default:
			CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
			break;
		}

		if (!(sei->u.nt0_area.flags & 0x80))
			break;
	}
}

/*
 * Handle channel subsystem related CRWs.
 * Use store event information to find out what's going on.
 *
 * Note: Access to sei_page is serialized through machine check handler
 * thread, so no need for locking.
 */
static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
{
	struct chsc_sei *sei = sei_page;

	if (overflow) {
		css_schedule_eval_all();
		return;
	}
	CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
		      "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
		      crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
		      crw0->erc, crw0->rsid);

	CIO_TRACE_EVENT(2, "prcss");
	chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
}

void chsc_chp_online(struct chp_id chpid)
{
	struct channel_path *chp = chpid_to_chp(chpid);
	struct chp_link link;
	char dbf_txt[15];

	sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
	CIO_TRACE_EVENT(2, dbf_txt);

	if (chp_get_status(chpid) != 0) {
		memset(&link, 0, sizeof(struct chp_link));
		link.chpid = chpid;
		/* Wait until previous actions have settled. */
		css_wait_for_slow_path();

		mutex_lock(&chp->lock);
		chp_update_desc(chp);
		mutex_unlock(&chp->lock);

		for_each_subchannel_staged(__s390_process_res_acc, NULL,
					   &link);
		css_schedule_reprobe();
	}
}

static void __s390_subchannel_vary_chpid(struct subchannel *sch,
					 struct chp_id chpid, int on)
{
	unsigned long flags;
	struct chp_link link;

	memset(&link, 0, sizeof(struct chp_link));
	link.chpid = chpid;
	spin_lock_irqsave(sch->lock, flags);
	if (sch->driver && sch->driver->chp_event)
		sch->driver->chp_event(sch, &link,
				       on ? CHP_VARY_ON : CHP_VARY_OFF);
	spin_unlock_irqrestore(sch->lock, flags);
}

static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
{
	struct chp_id *chpid = data;

	__s390_subchannel_vary_chpid(sch, *chpid, 0);
	return 0;
}

static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
{
	struct chp_id *chpid = data;

	__s390_subchannel_vary_chpid(sch, *chpid, 1);
	return 0;
}

/**
 * chsc_chp_vary - propagate channel-path vary operation to subchannels
 * @chpid: channl-path ID
 * @on: non-zero for vary online, zero for vary offline
 */
int chsc_chp_vary(struct chp_id chpid, int on)
{
	struct channel_path *chp = chpid_to_chp(chpid);

	/* Wait until previous actions have settled. */
	css_wait_for_slow_path();
	/*
	 * Redo PathVerification on the devices the chpid connects to
	 */
	if (on) {
		/* Try to update the channel path description. */
		chp_update_desc(chp);
		for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
					   NULL, &chpid);
		css_schedule_reprobe();
	} else
		for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
					   NULL, &chpid);

	return 0;
}

static void
chsc_remove_cmg_attr(struct channel_subsystem *css)
{
	int i;

	for (i = 0; i <= __MAX_CHPID; i++) {
		if (!css->chps[i])
			continue;
		chp_remove_cmg_attr(css->chps[i]);
	}
}

static int
chsc_add_cmg_attr(struct channel_subsystem *css)
{
	int i, ret;

	ret = 0;
	for (i = 0; i <= __MAX_CHPID; i++) {
		if (!css->chps[i])
			continue;
		ret = chp_add_cmg_attr(css->chps[i]);
		if (ret)
			goto cleanup;
	}
	return ret;
cleanup:
	for (--i; i >= 0; i--) {
		if (!css->chps[i])
			continue;
		chp_remove_cmg_attr(css->chps[i]);
	}
	return ret;
}

int __chsc_do_secm(struct channel_subsystem *css, int enable)
{
	struct {
		struct chsc_header request;
		u32 operation_code : 2;
		u32 : 30;
		u32 key : 4;
		u32 : 28;
		u32 zeroes1;
		u32 cub_addr1;
		u32 zeroes2;
		u32 cub_addr2;
		u32 reserved[13];
		struct chsc_header response;
		u32 status : 8;
		u32 : 4;
		u32 fmt : 4;
		u32 : 16;
	} *secm_area;
	unsigned long flags;
	int ret, ccode;

	spin_lock_irqsave(&chsc_page_lock, flags);
	memset(chsc_page, 0, PAGE_SIZE);
	secm_area = chsc_page;
	secm_area->request.length = 0x0050;
	secm_area->request.code = 0x0016;

	secm_area->key = PAGE_DEFAULT_KEY >> 4;
	secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
	secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;

	secm_area->operation_code = enable ? 0 : 1;

	ccode = chsc(secm_area);
	if (ccode > 0) {
		ret = (ccode == 3) ? -ENODEV : -EBUSY;
		goto out;
	}

	switch (secm_area->response.code) {
	case 0x0102:
	case 0x0103:
		ret = -EINVAL;
		break;
	default:
		ret = chsc_error_from_response(secm_area->response.code);
	}
	if (ret != 0)
		CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
			      secm_area->response.code);
out:
	spin_unlock_irqrestore(&chsc_page_lock, flags);
	return ret;
}

int
chsc_secm(struct channel_subsystem *css, int enable)
{
	int ret;

	if (enable && !css->cm_enabled) {
		css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
		css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
		if (!css->cub_addr1 || !css->cub_addr2) {
			free_page((unsigned long)css->cub_addr1);
			free_page((unsigned long)css->cub_addr2);
			return -ENOMEM;
		}
	}
	ret = __chsc_do_secm(css, enable);
	if (!ret) {
		css->cm_enabled = enable;
		if (css->cm_enabled) {
			ret = chsc_add_cmg_attr(css);
			if (ret) {
				__chsc_do_secm(css, 0);
				css->cm_enabled = 0;
			}
		} else
			chsc_remove_cmg_attr(css);
	}
	if (!css->cm_enabled) {
		free_page((unsigned long)css->cub_addr1);
		free_page((unsigned long)css->cub_addr2);
	}
	return ret;
}

int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
				     int c, int m, void *page)
{
	struct chsc_scpd *scpd_area;
	int ccode, ret;

	if ((rfmt == 1 || rfmt == 0) && c == 1 &&
	    !css_general_characteristics.fcs)
		return -EINVAL;
	if ((rfmt == 2) && !css_general_characteristics.cib)
		return -EINVAL;
	if ((rfmt == 3) && !css_general_characteristics.util_str)
		return -EINVAL;

	memset(page, 0, PAGE_SIZE);
	scpd_area = page;
	scpd_area->request.length = 0x0010;
	scpd_area->request.code = 0x0002;
	scpd_area->cssid = chpid.cssid;
	scpd_area->first_chpid = chpid.id;
	scpd_area->last_chpid = chpid.id;
	scpd_area->m = m;
	scpd_area->c = c;
	scpd_area->fmt = fmt;
	scpd_area->rfmt = rfmt;

	ccode = chsc(scpd_area);
	if (ccode > 0)
		return (ccode == 3) ? -ENODEV : -EBUSY;

	ret = chsc_error_from_response(scpd_area->response.code);
	if (ret)
		CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
			      scpd_area->response.code);
	return ret;
}
EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);

#define chsc_det_chp_desc(FMT, c)					\
int chsc_determine_fmt##FMT##_channel_path_desc(			\
	struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)	\
{									\
	struct chsc_scpd *scpd_area;					\
	unsigned long flags;						\
	int ret;							\
									\
	spin_lock_irqsave(&chsc_page_lock, flags);			\
	scpd_area = chsc_page;						\
	ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0,	\
					       scpd_area);		\
	if (ret)							\
		goto out;						\
									\
	memcpy(desc, scpd_area->data, sizeof(*desc));			\
out:									\
	spin_unlock_irqrestore(&chsc_page_lock, flags);			\
	return ret;							\
}

chsc_det_chp_desc(0, 0)
chsc_det_chp_desc(1, 1)
chsc_det_chp_desc(3, 0)

static void
chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
			  struct cmg_chars *chars)
{
	int i, mask;

	for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
		mask = 0x80 >> (i + 3);
		if (cmcv & mask)
			chp->cmg_chars.values[i] = chars->values[i];
		else
			chp->cmg_chars.values[i] = 0;
	}
}

int chsc_get_channel_measurement_chars(struct channel_path *chp)
{
	unsigned long flags;
	int ccode, ret;

	struct {
		struct chsc_header request;
		u32 : 24;
		u32 first_chpid : 8;
		u32 : 24;
		u32 last_chpid : 8;
		u32 zeroes1;
		struct chsc_header response;
		u32 zeroes2;
		u32 not_valid : 1;
		u32 shared : 1;
		u32 : 22;
		u32 chpid : 8;
		u32 cmcv : 5;
		u32 : 11;
		u32 cmgq : 8;
		u32 cmg : 8;
		u32 zeroes3;
		u32 data[NR_MEASUREMENT_CHARS];
	} *scmc_area;

	chp->shared = -1;
	chp->cmg = -1;

	if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
		return -EINVAL;

	spin_lock_irqsave(&chsc_page_lock, flags);
	memset(chsc_page, 0, PAGE_SIZE);
	scmc_area = chsc_page;
	scmc_area->request.length = 0x0010;
	scmc_area->request.code = 0x0022;
	scmc_area->first_chpid = chp->chpid.id;
	scmc_area->last_chpid = chp->chpid.id;

	ccode = chsc(scmc_area);
	if (ccode > 0) {
		ret = (ccode == 3) ? -ENODEV : -EBUSY;
		goto out;
	}

	ret = chsc_error_from_response(scmc_area->response.code);
	if (ret) {
		CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
			      scmc_area->response.code);
		goto out;
	}
	if (scmc_area->not_valid)
		goto out;

	chp->cmg = scmc_area->cmg;
	chp->shared = scmc_area->shared;
	if (chp->cmg != 2 && chp->cmg != 3) {
		/* No cmg-dependent data. */
		goto out;
	}
	chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
				  (struct cmg_chars *) &scmc_area->data);
out:
	spin_unlock_irqrestore(&chsc_page_lock, flags);
	return ret;
}

int __init chsc_init(void)
{
	int ret;

	sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sei_page || !chsc_page) {
		ret = -ENOMEM;
		goto out_err;
	}
	ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
	if (ret)
		goto out_err;
	return ret;
out_err:
	free_page((unsigned long)chsc_page);
	free_page((unsigned long)sei_page);
	return ret;
}

void __init chsc_init_cleanup(void)
{
	crw_unregister_handler(CRW_RSC_CSS);
	free_page((unsigned long)chsc_page);
	free_page((unsigned long)sei_page);
}

int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
{
	int ret;

	sda_area->request.length = 0x0400;
	sda_area->request.code = 0x0031;
	sda_area->operation_code = operation_code;

	ret = chsc(sda_area);
	if (ret > 0) {
		ret = (ret == 3) ? -ENODEV : -EBUSY;
		goto out;
	}

	switch (sda_area->response.code) {
	case 0x0101:
		ret = -EOPNOTSUPP;
		break;
	default:
		ret = chsc_error_from_response(sda_area->response.code);
	}
out:
	return ret;
}

int chsc_enable_facility(int operation_code)
{
	struct chsc_sda_area *sda_area;
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&chsc_page_lock, flags);
	memset(chsc_page, 0, PAGE_SIZE);
	sda_area = chsc_page;

	ret = __chsc_enable_facility(sda_area, operation_code);
	if (ret != 0)
		CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
			      operation_code, sda_area->response.code);

	spin_unlock_irqrestore(&chsc_page_lock, flags);
	return ret;
}

int __init chsc_get_cssid(int idx)
{
	struct {
		struct chsc_header request;
		u8 atype;
		u32 : 24;
		u32 reserved1[6];
		struct chsc_header response;
		u32 reserved2[3];
		struct {
			u8 cssid;
			u32 : 24;
		} list[0];
	} *sdcal_area;
	int ret;

	spin_lock_irq(&chsc_page_lock);
	memset(chsc_page, 0, PAGE_SIZE);
	sdcal_area = chsc_page;
	sdcal_area->request.length = 0x0020;
	sdcal_area->request.code = 0x0034;
	sdcal_area->atype = 4;

	ret = chsc(sdcal_area);
	if (ret) {
		ret = (ret == 3) ? -ENODEV : -EBUSY;
		goto exit;
	}

	ret = chsc_error_from_response(sdcal_area->response.code);
	if (ret) {
		CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
			      sdcal_area->response.code);
		goto exit;
	}

	if ((addr_t) &sdcal_area->list[idx] <
	    (addr_t) &sdcal_area->response + sdcal_area->response.length)
		ret = sdcal_area->list[idx].cssid;
	else
		ret = -ENODEV;
exit:
	spin_unlock_irq(&chsc_page_lock);
	return ret;
}

struct css_general_char css_general_characteristics;
struct css_chsc_char css_chsc_characteristics;

int __init
chsc_determine_css_characteristics(void)
{
	unsigned long flags;
	int result;
	struct {
		struct chsc_header request;
		u32 reserved1;
		u32 reserved2;
		u32 reserved3;
		struct chsc_header response;
		u32 reserved4;
		u32 general_char[510];
		u32 chsc_char[508];
	} *scsc_area;

	spin_lock_irqsave(&chsc_page_lock, flags);
	memset(chsc_page, 0, PAGE_SIZE);
	scsc_area = chsc_page;
	scsc_area->request.length = 0x0010;
	scsc_area->request.code = 0x0010;

	result = chsc(scsc_area);
	if (result) {
		result = (result == 3) ? -ENODEV : -EBUSY;
		goto exit;
	}

	result = chsc_error_from_response(scsc_area->response.code);
	if (result == 0) {
		memcpy(&css_general_characteristics, scsc_area->general_char,
		       sizeof(css_general_characteristics));
		memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
		       sizeof(css_chsc_characteristics));
	} else
		CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
			      scsc_area->response.code);
exit:
	spin_unlock_irqrestore(&chsc_page_lock, flags);
	return result;
}

EXPORT_SYMBOL_GPL(css_general_characteristics);
EXPORT_SYMBOL_GPL(css_chsc_characteristics);

int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
{
	struct {
		struct chsc_header request;
		unsigned int rsvd0;
		unsigned int op : 8;
		unsigned int rsvd1 : 8;
		unsigned int ctrl : 16;
		unsigned int rsvd2[5];
		struct chsc_header response;
		unsigned int rsvd3[3];
		u64 clock_delta;
		unsigned int rsvd4[2];
	} *rr;
	int rc;

	memset(page, 0, PAGE_SIZE);
	rr = page;
	rr->request.length = 0x0020;
	rr->request.code = 0x0033;
	rr->op = op;
	rr->ctrl = ctrl;
	rc = chsc(rr);
	if (rc)
		return -EIO;
	rc = (rr->response.code == 0x0001) ? 0 : -EIO;
	if (clock_delta)
		*clock_delta = rr->clock_delta;
	return rc;
}

int chsc_sstpi(void *page, void *result, size_t size)
{
	struct {
		struct chsc_header request;
		unsigned int rsvd0[3];
		struct chsc_header response;
		char data[];
	} *rr;
	int rc;

	memset(page, 0, PAGE_SIZE);
	rr = page;
	rr->request.length = 0x0010;
	rr->request.code = 0x0038;
	rc = chsc(rr);
	if (rc)
		return -EIO;
	memcpy(result, &rr->data, size);
	return (rr->response.code == 0x0001) ? 0 : -EIO;
}

int chsc_siosl(struct subchannel_id schid)
{
	struct {
		struct chsc_header request;
		u32 word1;
		struct subchannel_id sid;
		u32 word3;
		struct chsc_header response;
		u32 word[11];
	} *siosl_area;
	unsigned long flags;
	int ccode;
	int rc;

	spin_lock_irqsave(&chsc_page_lock, flags);
	memset(chsc_page, 0, PAGE_SIZE);
	siosl_area = chsc_page;
	siosl_area->request.length = 0x0010;
	siosl_area->request.code = 0x0046;
	siosl_area->word1 = 0x80000000;
	siosl_area->sid = schid;

	ccode = chsc(siosl_area);
	if (ccode > 0) {
		if (ccode == 3)
			rc = -ENODEV;
		else
			rc = -EBUSY;
		CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
			      schid.ssid, schid.sch_no, ccode);
		goto out;
	}
	rc = chsc_error_from_response(siosl_area->response.code);
	if (rc)
		CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
			      schid.ssid, schid.sch_no,
			      siosl_area->response.code);
	else
		CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
			      schid.ssid, schid.sch_no);
out:
	spin_unlock_irqrestore(&chsc_page_lock, flags);
	return rc;
}
EXPORT_SYMBOL_GPL(chsc_siosl);

/**
 * chsc_scm_info() - store SCM information (SSI)
 * @scm_area: request and response block for SSI
 * @token: continuation token
 *
 * Returns 0 on success.
 */
int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
{
	int ccode, ret;

	memset(scm_area, 0, sizeof(*scm_area));
	scm_area->request.length = 0x0020;
	scm_area->request.code = 0x004C;
	scm_area->reqtok = token;

	ccode = chsc(scm_area);
	if (ccode > 0) {
		ret = (ccode == 3) ? -ENODEV : -EBUSY;
		goto out;
	}
	ret = chsc_error_from_response(scm_area->response.code);
	if (ret != 0)
		CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
			      scm_area->response.code);
out:
	return ret;
}
EXPORT_SYMBOL_GPL(chsc_scm_info);

/**
 * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
 * @schid:		id of the subchannel on which PNSO is performed
 * @brinfo_area:	request and response block for the operation
 * @resume_token:	resume token for multiblock response
 * @cnc:		Boolean change-notification control
 *
 * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
 *
 * Returns 0 on success.
 */
int chsc_pnso_brinfo(struct subchannel_id schid,
		struct chsc_pnso_area *brinfo_area,
		struct chsc_brinfo_resume_token resume_token,
		int cnc)
{
	memset(brinfo_area, 0, sizeof(*brinfo_area));
	brinfo_area->request.length = 0x0030;
	brinfo_area->request.code = 0x003d; /* network-subchannel operation */
	brinfo_area->m	   = schid.m;
	brinfo_area->ssid  = schid.ssid;
	brinfo_area->sch   = schid.sch_no;
	brinfo_area->cssid = schid.cssid;
	brinfo_area->oc    = 0; /* Store-network-bridging-information list */
	brinfo_area->resume_token = resume_token;
	brinfo_area->n	   = (cnc != 0);
	if (chsc(brinfo_area))
		return -EIO;
	return chsc_error_from_response(brinfo_area->response.code);
}
EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);

int chsc_sgib(u32 origin)
{
	struct {
		struct chsc_header request;
		u16 op;
		u8  reserved01[2];
		u8  reserved02:4;
		u8  fmt:4;
		u8  reserved03[7];
		/* operation data area begin */
		u8  reserved04[4];
		u32 gib_origin;
		u8  reserved05[10];
		u8  aix;
		u8  reserved06[4029];
		struct chsc_header response;
		u8  reserved07[4];
	} *sgib_area;
	int ret;

	spin_lock_irq(&chsc_page_lock);
	memset(chsc_page, 0, PAGE_SIZE);
	sgib_area = chsc_page;
	sgib_area->request.length = 0x0fe0;
	sgib_area->request.code = 0x0021;
	sgib_area->op = 0x1;
	sgib_area->gib_origin = origin;

	ret = chsc(sgib_area);
	if (ret == 0)
		ret = chsc_error_from_response(sgib_area->response.code);
	spin_unlock_irq(&chsc_page_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(chsc_sgib);
OpenPOWER on IntegriCloud