summaryrefslogtreecommitdiff
path: root/drivers/s390/cio/qdio_main.c
blob: cfce255521ac4b2a8d1e2ab0ffba19d597810ca7 (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
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
// SPDX-License-Identifier: GPL-2.0
/*
 * Linux for s390 qdio support, buffer handling, qdio API and module support.
 *
 * Copyright IBM Corp. 2000, 2008
 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
 *	      Jan Glauber <jang@linux.vnet.ibm.com>
 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/io.h>
#include <linux/atomic.h>
#include <asm/debug.h>
#include <asm/qdio.h>
#include <asm/ipl.h>

#include "cio.h"
#include "css.h"
#include "device.h"
#include "qdio.h"
#include "qdio_debug.h"

MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
	"Jan Glauber <jang@linux.vnet.ibm.com>");
MODULE_DESCRIPTION("QDIO base support");
MODULE_LICENSE("GPL");

static inline int do_siga_sync(unsigned long schid,
			       unsigned int out_mask, unsigned int in_mask,
			       unsigned int fc)
{
	register unsigned long __fc asm ("0") = fc;
	register unsigned long __schid asm ("1") = schid;
	register unsigned long out asm ("2") = out_mask;
	register unsigned long in asm ("3") = in_mask;
	int cc;

	asm volatile(
		"	siga	0\n"
		"	ipm	%0\n"
		"	srl	%0,28\n"
		: "=d" (cc)
		: "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
	return cc;
}

static inline int do_siga_input(unsigned long schid, unsigned int mask,
				unsigned int fc)
{
	register unsigned long __fc asm ("0") = fc;
	register unsigned long __schid asm ("1") = schid;
	register unsigned long __mask asm ("2") = mask;
	int cc;

	asm volatile(
		"	siga	0\n"
		"	ipm	%0\n"
		"	srl	%0,28\n"
		: "=d" (cc)
		: "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
	return cc;
}

/**
 * do_siga_output - perform SIGA-w/wt function
 * @schid: subchannel id or in case of QEBSM the subchannel token
 * @mask: which output queues to process
 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
 * @fc: function code to perform
 * @aob: asynchronous operation block
 *
 * Returns condition code.
 * Note: For IQDC unicast queues only the highest priority queue is processed.
 */
static inline int do_siga_output(unsigned long schid, unsigned long mask,
				 unsigned int *bb, unsigned int fc,
				 unsigned long aob)
{
	register unsigned long __fc asm("0") = fc;
	register unsigned long __schid asm("1") = schid;
	register unsigned long __mask asm("2") = mask;
	register unsigned long __aob asm("3") = aob;
	int cc;

	asm volatile(
		"	siga	0\n"
		"	ipm	%0\n"
		"	srl	%0,28\n"
		: "=d" (cc), "+d" (__fc), "+d" (__aob)
		: "d" (__schid), "d" (__mask)
		: "cc");
	*bb = __fc >> 31;
	return cc;
}

/**
 * qdio_do_eqbs - extract buffer states for QEBSM
 * @q: queue to manipulate
 * @state: state of the extracted buffers
 * @start: buffer number to start at
 * @count: count of buffers to examine
 * @auto_ack: automatically acknowledge buffers
 *
 * Returns the number of successfully extracted equal buffer states.
 * Stops processing if a state is different from the last buffers state.
 */
static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
			int start, int count, int auto_ack)
{
	int tmp_count = count, tmp_start = start, nr = q->nr;
	unsigned int ccq = 0;

	qperf_inc(q, eqbs);

	if (!q->is_input_q)
		nr += q->irq_ptr->nr_input_qs;
again:
	ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
		      auto_ack);

	switch (ccq) {
	case 0:
	case 32:
		/* all done, or next buffer state different */
		return count - tmp_count;
	case 96:
		/* not all buffers processed */
		qperf_inc(q, eqbs_partial);
		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
			tmp_count);
		return count - tmp_count;
	case 97:
		/* no buffer processed */
		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
		goto again;
	default:
		DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
		DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
		DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
		q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
			   q->first_to_kick, count, q->irq_ptr->int_parm);
		return 0;
	}
}

/**
 * qdio_do_sqbs - set buffer states for QEBSM
 * @q: queue to manipulate
 * @state: new state of the buffers
 * @start: first buffer number to change
 * @count: how many buffers to change
 *
 * Returns the number of successfully changed buffers.
 * Does retrying until the specified count of buffer states is set or an
 * error occurs.
 */
static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
			int count)
{
	unsigned int ccq = 0;
	int tmp_count = count, tmp_start = start;
	int nr = q->nr;

	if (!count)
		return 0;
	qperf_inc(q, sqbs);

	if (!q->is_input_q)
		nr += q->irq_ptr->nr_input_qs;
again:
	ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);

	switch (ccq) {
	case 0:
	case 32:
		/* all done, or active buffer adapter-owned */
		WARN_ON_ONCE(tmp_count);
		return count - tmp_count;
	case 96:
		/* not all buffers processed */
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
		qperf_inc(q, sqbs_partial);
		goto again;
	default:
		DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
		DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
		DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
		q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr,
			   q->first_to_kick, count, q->irq_ptr->int_parm);
		return 0;
	}
}

/*
 * Returns number of examined buffers and their common state in *state.
 * Requested number of buffers-to-examine must be > 0.
 */
static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
				 unsigned char *state, unsigned int count,
				 int auto_ack, int merge_pending)
{
	unsigned char __state = 0;
	int i;

	if (is_qebsm(q))
		return qdio_do_eqbs(q, state, bufnr, count, auto_ack);

	/* get initial state: */
	__state = q->slsb.val[bufnr];
	if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
		__state = SLSB_P_OUTPUT_EMPTY;

	for (i = 1; i < count; i++) {
		bufnr = next_buf(bufnr);

		/* merge PENDING into EMPTY: */
		if (merge_pending &&
		    q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
		    __state == SLSB_P_OUTPUT_EMPTY)
			continue;

		/* stop if next state differs from initial state: */
		if (q->slsb.val[bufnr] != __state)
			break;
	}
	*state = __state;
	return i;
}

static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
				unsigned char *state, int auto_ack)
{
	return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
}

/* wrap-around safe setting of slsb states, returns number of changed buffers */
static inline int set_buf_states(struct qdio_q *q, int bufnr,
				 unsigned char state, int count)
{
	int i;

	if (is_qebsm(q))
		return qdio_do_sqbs(q, state, bufnr, count);

	for (i = 0; i < count; i++) {
		xchg(&q->slsb.val[bufnr], state);
		bufnr = next_buf(bufnr);
	}
	return count;
}

static inline int set_buf_state(struct qdio_q *q, int bufnr,
				unsigned char state)
{
	return set_buf_states(q, bufnr, state, 1);
}

/* set slsb states to initial state */
static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
{
	struct qdio_q *q;
	int i;

	for_each_input_queue(irq_ptr, q, i)
		set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
			       QDIO_MAX_BUFFERS_PER_Q);
	for_each_output_queue(irq_ptr, q, i)
		set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
			       QDIO_MAX_BUFFERS_PER_Q);
}

static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
			  unsigned int input)
{
	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
	unsigned int fc = QDIO_SIGA_SYNC;
	int cc;

	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
	qperf_inc(q, siga_sync);

	if (is_qebsm(q)) {
		schid = q->irq_ptr->sch_token;
		fc |= QDIO_SIGA_QEBSM_FLAG;
	}

	cc = do_siga_sync(schid, output, input, fc);
	if (unlikely(cc))
		DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
	return (cc) ? -EIO : 0;
}

static inline int qdio_siga_sync_q(struct qdio_q *q)
{
	if (q->is_input_q)
		return qdio_siga_sync(q, 0, q->mask);
	else
		return qdio_siga_sync(q, q->mask, 0);
}

static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
	unsigned long aob)
{
	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
	unsigned int fc = QDIO_SIGA_WRITE;
	u64 start_time = 0;
	int retries = 0, cc;
	unsigned long laob = 0;

	WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
			     !q->u.out.use_cq));
	if (q->u.out.use_cq && aob != 0) {
		fc = QDIO_SIGA_WRITEQ;
		laob = aob;
	}

	if (is_qebsm(q)) {
		schid = q->irq_ptr->sch_token;
		fc |= QDIO_SIGA_QEBSM_FLAG;
	}
again:
	cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);

	/* hipersocket busy condition */
	if (unlikely(*busy_bit)) {
		retries++;

		if (!start_time) {
			start_time = get_tod_clock_fast();
			goto again;
		}
		if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
			goto again;
	}
	if (retries) {
		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
			      "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
	}
	return cc;
}

static inline int qdio_siga_input(struct qdio_q *q)
{
	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
	unsigned int fc = QDIO_SIGA_READ;
	int cc;

	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
	qperf_inc(q, siga_read);

	if (is_qebsm(q)) {
		schid = q->irq_ptr->sch_token;
		fc |= QDIO_SIGA_QEBSM_FLAG;
	}

	cc = do_siga_input(schid, q->mask, fc);
	if (unlikely(cc))
		DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
	return (cc) ? -EIO : 0;
}

#define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
#define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)

static inline void qdio_sync_queues(struct qdio_q *q)
{
	/* PCI capable outbound queues will also be scanned so sync them too */
	if (pci_out_supported(q->irq_ptr))
		qdio_siga_sync_all(q);
	else
		qdio_siga_sync_q(q);
}

int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
			unsigned char *state)
{
	if (need_siga_sync(q))
		qdio_siga_sync_q(q);
	return get_buf_states(q, bufnr, state, 1, 0, 0);
}

static inline void qdio_stop_polling(struct qdio_q *q)
{
	if (!q->u.in.polling)
		return;

	q->u.in.polling = 0;
	qperf_inc(q, stop_polling);

	/* show the card that we are not polling anymore */
	if (is_qebsm(q)) {
		set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
			       q->u.in.ack_count);
		q->u.in.ack_count = 0;
	} else
		set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
}

static inline void account_sbals(struct qdio_q *q, unsigned int count)
{
	int pos;

	q->q_stats.nr_sbal_total += count;
	if (count == QDIO_MAX_BUFFERS_MASK) {
		q->q_stats.nr_sbals[7]++;
		return;
	}
	pos = ilog2(count);
	q->q_stats.nr_sbals[pos]++;
}

static void process_buffer_error(struct qdio_q *q, unsigned int start,
				 int count)
{
	unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
					SLSB_P_OUTPUT_NOT_INIT;

	q->qdio_error = QDIO_ERROR_SLSB_STATE;

	/* special handling for no target buffer empty */
	if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
	    q->sbal[start]->element[15].sflags == 0x10) {
		qperf_inc(q, target_full);
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
		goto set;
	}

	DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
	DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
	DBF_ERROR("FTC:%3d C:%3d", start, count);
	DBF_ERROR("F14:%2x F15:%2x",
		  q->sbal[start]->element[14].sflags,
		  q->sbal[start]->element[15].sflags);

set:
	/*
	 * Interrupts may be avoided as long as the error is present
	 * so change the buffer state immediately to avoid starvation.
	 */
	set_buf_states(q, start, state, count);
}

static inline void inbound_primed(struct qdio_q *q, unsigned int start,
				  int count)
{
	int new;

	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);

	/* for QEBSM the ACK was already set by EQBS */
	if (is_qebsm(q)) {
		if (!q->u.in.polling) {
			q->u.in.polling = 1;
			q->u.in.ack_count = count;
			q->u.in.ack_start = start;
			return;
		}

		/* delete the previous ACK's */
		set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
			       q->u.in.ack_count);
		q->u.in.ack_count = count;
		q->u.in.ack_start = start;
		return;
	}

	/*
	 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
	 * or by the next inbound run.
	 */
	new = add_buf(start, count - 1);
	if (q->u.in.polling) {
		/* reset the previous ACK but first set the new one */
		set_buf_state(q, new, SLSB_P_INPUT_ACK);
		set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
	} else {
		q->u.in.polling = 1;
		set_buf_state(q, new, SLSB_P_INPUT_ACK);
	}

	q->u.in.ack_start = new;
	count--;
	if (!count)
		return;
	/* need to change ALL buffers to get more interrupts */
	set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
}

static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
{
	unsigned char state = 0;
	int count;

	q->timestamp = get_tod_clock_fast();

	/*
	 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
	 * would return 0.
	 */
	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
	if (!count)
		return 0;

	/*
	 * No siga sync here, as a PCI or we after a thin interrupt
	 * already sync'ed the queues.
	 */
	count = get_buf_states(q, start, &state, count, 1, 0);
	if (!count)
		return 0;

	switch (state) {
	case SLSB_P_INPUT_PRIMED:
		inbound_primed(q, start, count);
		if (atomic_sub_return(count, &q->nr_buf_used) == 0)
			qperf_inc(q, inbound_queue_full);
		if (q->irq_ptr->perf_stat_enabled)
			account_sbals(q, count);
		return count;
	case SLSB_P_INPUT_ERROR:
		process_buffer_error(q, start, count);
		if (atomic_sub_return(count, &q->nr_buf_used) == 0)
			qperf_inc(q, inbound_queue_full);
		if (q->irq_ptr->perf_stat_enabled)
			account_sbals_error(q, count);
		return count;
	case SLSB_CU_INPUT_EMPTY:
	case SLSB_P_INPUT_NOT_INIT:
	case SLSB_P_INPUT_ACK:
		if (q->irq_ptr->perf_stat_enabled)
			q->q_stats.nr_sbal_nop++;
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
			      q->nr, start);
		return 0;
	default:
		WARN_ON_ONCE(1);
		return 0;
	}
}

static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
{
	int count;

	count = get_inbound_buffer_frontier(q, start);

	if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
		q->u.in.timestamp = get_tod_clock();

	return count;
}

static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
{
	unsigned char state = 0;

	if (!atomic_read(&q->nr_buf_used))
		return 1;

	if (need_siga_sync(q))
		qdio_siga_sync_q(q);
	get_buf_state(q, start, &state, 0);

	if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
		/* more work coming */
		return 0;

	if (is_thinint_irq(q->irq_ptr))
		return 1;

	/* don't poll under z/VM */
	if (MACHINE_IS_VM)
		return 1;

	/*
	 * At this point we know, that inbound first_to_check
	 * has (probably) not moved (see qdio_inbound_processing).
	 */
	if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start);
		return 1;
	} else
		return 0;
}

static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
{
	unsigned char state = 0;
	int j, b = start;

	for (j = 0; j < count; ++j) {
		get_buf_state(q, b, &state, 0);
		if (state == SLSB_P_OUTPUT_PENDING) {
			struct qaob *aob = q->u.out.aobs[b];
			if (aob == NULL)
				continue;

			q->u.out.sbal_state[b].flags |=
				QDIO_OUTBUF_STATE_FLAG_PENDING;
			q->u.out.aobs[b] = NULL;
		}
		b = next_buf(b);
	}
}

static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
					int bufnr)
{
	unsigned long phys_aob = 0;

	if (!q->use_cq)
		return 0;

	if (!q->aobs[bufnr]) {
		struct qaob *aob = qdio_allocate_aob();
		q->aobs[bufnr] = aob;
	}
	if (q->aobs[bufnr]) {
		q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
		phys_aob = virt_to_phys(q->aobs[bufnr]);
		WARN_ON_ONCE(phys_aob & 0xFF);
	}

	q->sbal_state[bufnr].flags = 0;
	return phys_aob;
}

static void qdio_kick_handler(struct qdio_q *q, unsigned int count)
{
	int start = q->first_to_kick;

	if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
		return;

	if (q->is_input_q) {
		qperf_inc(q, inbound_handler);
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
	} else {
		qperf_inc(q, outbound_handler);
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
			      start, count);
		if (q->u.out.use_cq)
			qdio_handle_aobs(q, start, count);
	}

	q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
		   q->irq_ptr->int_parm);

	/* for the next time */
	q->first_to_kick = add_buf(start, count);
	q->qdio_error = 0;
}

static inline int qdio_tasklet_schedule(struct qdio_q *q)
{
	if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
		tasklet_schedule(&q->tasklet);
		return 0;
	}
	return -EPERM;
}

static void __qdio_inbound_processing(struct qdio_q *q)
{
	unsigned int start = q->first_to_check;
	int count;

	qperf_inc(q, tasklet_inbound);

	count = qdio_inbound_q_moved(q, start);
	if (count == 0)
		return;

	start = add_buf(start, count);
	q->first_to_check = start;
	qdio_kick_handler(q, count);

	if (!qdio_inbound_q_done(q, start)) {
		/* means poll time is not yet over */
		qperf_inc(q, tasklet_inbound_resched);
		if (!qdio_tasklet_schedule(q))
			return;
	}

	qdio_stop_polling(q);
	/*
	 * We need to check again to not lose initiative after
	 * resetting the ACK state.
	 */
	if (!qdio_inbound_q_done(q, start)) {
		qperf_inc(q, tasklet_inbound_resched2);
		qdio_tasklet_schedule(q);
	}
}

void qdio_inbound_processing(unsigned long data)
{
	struct qdio_q *q = (struct qdio_q *)data;
	__qdio_inbound_processing(q);
}

static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
{
	unsigned char state = 0;
	int count;

	q->timestamp = get_tod_clock_fast();

	if (need_siga_sync(q))
		if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
		    !pci_out_supported(q->irq_ptr)) ||
		    (queue_type(q) == QDIO_IQDIO_QFMT &&
		    multicast_outbound(q)))
			qdio_siga_sync_q(q);

	/*
	 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
	 * would return 0.
	 */
	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
	if (!count)
		return 0;

	count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
	if (!count)
		return 0;

	switch (state) {
	case SLSB_P_OUTPUT_EMPTY:
		/* the adapter got it */
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
			"out empty:%1d %02x", q->nr, count);

		atomic_sub(count, &q->nr_buf_used);
		if (q->irq_ptr->perf_stat_enabled)
			account_sbals(q, count);
		return count;
	case SLSB_P_OUTPUT_ERROR:
		process_buffer_error(q, start, count);
		atomic_sub(count, &q->nr_buf_used);
		if (q->irq_ptr->perf_stat_enabled)
			account_sbals_error(q, count);
		return count;
	case SLSB_CU_OUTPUT_PRIMED:
		/* the adapter has not fetched the output yet */
		if (q->irq_ptr->perf_stat_enabled)
			q->q_stats.nr_sbal_nop++;
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
			      q->nr);
		return 0;
	case SLSB_P_OUTPUT_NOT_INIT:
	case SLSB_P_OUTPUT_HALTED:
		return 0;
	default:
		WARN_ON_ONCE(1);
		return 0;
	}
}

/* all buffers processed? */
static inline int qdio_outbound_q_done(struct qdio_q *q)
{
	return atomic_read(&q->nr_buf_used) == 0;
}

static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
{
	int count;

	count = get_outbound_buffer_frontier(q, start);

	if (count)
		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);

	return count;
}

static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
{
	int retries = 0, cc;
	unsigned int busy_bit;

	if (!need_siga_out(q))
		return 0;

	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
retry:
	qperf_inc(q, siga_write);

	cc = qdio_siga_output(q, &busy_bit, aob);
	switch (cc) {
	case 0:
		break;
	case 2:
		if (busy_bit) {
			while (++retries < QDIO_BUSY_BIT_RETRIES) {
				mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
				goto retry;
			}
			DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
			cc = -EBUSY;
		} else {
			DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
			cc = -ENOBUFS;
		}
		break;
	case 1:
	case 3:
		DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
		cc = -EIO;
		break;
	}
	if (retries) {
		DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
		DBF_ERROR("count:%u", retries);
	}
	return cc;
}

static void __qdio_outbound_processing(struct qdio_q *q)
{
	unsigned int start = q->first_to_check;
	int count;

	qperf_inc(q, tasklet_outbound);
	WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);

	count = qdio_outbound_q_moved(q, start);
	if (count) {
		q->first_to_check = add_buf(start, count);
		qdio_kick_handler(q, count);
	}

	if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
	    !qdio_outbound_q_done(q))
		goto sched;

	if (q->u.out.pci_out_enabled)
		return;

	/*
	 * Now we know that queue type is either qeth without pci enabled
	 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
	 * is noticed and outbound_handler is called after some time.
	 */
	if (qdio_outbound_q_done(q))
		del_timer_sync(&q->u.out.timer);
	else
		if (!timer_pending(&q->u.out.timer) &&
		    likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
			mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
	return;

sched:
	qdio_tasklet_schedule(q);
}

/* outbound tasklet */
void qdio_outbound_processing(unsigned long data)
{
	struct qdio_q *q = (struct qdio_q *)data;
	__qdio_outbound_processing(q);
}

void qdio_outbound_timer(struct timer_list *t)
{
	struct qdio_q *q = from_timer(q, t, u.out.timer);

	qdio_tasklet_schedule(q);
}

static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
{
	struct qdio_q *out;
	int i;

	if (!pci_out_supported(irq))
		return;

	for_each_output_queue(irq, out, i)
		if (!qdio_outbound_q_done(out))
			qdio_tasklet_schedule(out);
}

static void __tiqdio_inbound_processing(struct qdio_q *q)
{
	unsigned int start = q->first_to_check;
	int count;

	qperf_inc(q, tasklet_inbound);
	if (need_siga_sync(q) && need_siga_sync_after_ai(q))
		qdio_sync_queues(q);

	/* The interrupt could be caused by a PCI request: */
	qdio_check_outbound_pci_queues(q->irq_ptr);

	count = qdio_inbound_q_moved(q, start);
	if (count == 0)
		return;

	start = add_buf(start, count);
	q->first_to_check = start;
	qdio_kick_handler(q, count);

	if (!qdio_inbound_q_done(q, start)) {
		qperf_inc(q, tasklet_inbound_resched);
		if (!qdio_tasklet_schedule(q))
			return;
	}

	qdio_stop_polling(q);
	/*
	 * We need to check again to not lose initiative after
	 * resetting the ACK state.
	 */
	if (!qdio_inbound_q_done(q, start)) {
		qperf_inc(q, tasklet_inbound_resched2);
		qdio_tasklet_schedule(q);
	}
}

void tiqdio_inbound_processing(unsigned long data)
{
	struct qdio_q *q = (struct qdio_q *)data;
	__tiqdio_inbound_processing(q);
}

static inline void qdio_set_state(struct qdio_irq *irq_ptr,
				  enum qdio_irq_states state)
{
	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);

	irq_ptr->state = state;
	mb();
}

static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
{
	if (irb->esw.esw0.erw.cons) {
		DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
		DBF_ERROR_HEX(irb, 64);
		DBF_ERROR_HEX(irb->ecw, 64);
	}
}

/* PCI interrupt handler */
static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
{
	int i;
	struct qdio_q *q;

	if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
		return;

	for_each_input_queue(irq_ptr, q, i) {
		if (q->u.in.queue_start_poll) {
			/* skip if polling is enabled or already in work */
			if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
				     &q->u.in.queue_irq_state)) {
				qperf_inc(q, int_discarded);
				continue;
			}
			q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
						 q->irq_ptr->int_parm);
		} else {
			tasklet_schedule(&q->tasklet);
		}
	}

	if (!pci_out_supported(irq_ptr))
		return;

	for_each_output_queue(irq_ptr, q, i) {
		if (qdio_outbound_q_done(q))
			continue;
		if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
			qdio_siga_sync_q(q);
		qdio_tasklet_schedule(q);
	}
}

static void qdio_handle_activate_check(struct ccw_device *cdev,
				unsigned long intparm, int cstat, int dstat)
{
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
	struct qdio_q *q;
	int count;

	DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
	DBF_ERROR("intp :%lx", intparm);
	DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);

	if (irq_ptr->nr_input_qs) {
		q = irq_ptr->input_qs[0];
	} else if (irq_ptr->nr_output_qs) {
		q = irq_ptr->output_qs[0];
	} else {
		dump_stack();
		goto no_handler;
	}

	count = sub_buf(q->first_to_check, q->first_to_kick);
	q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
		   q->nr, q->first_to_kick, count, irq_ptr->int_parm);
no_handler:
	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
	/*
	 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
	 * Therefore we call the LGR detection function here.
	 */
	lgr_info_log();
}

static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
				      int dstat)
{
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;

	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");

	if (cstat)
		goto error;
	if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
		goto error;
	if (!(dstat & DEV_STAT_DEV_END))
		goto error;
	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
	return;

error:
	DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
	DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
}

/* qdio interrupt handler */
void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
		      struct irb *irb)
{
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
	struct subchannel_id schid;
	int cstat, dstat;

	if (!intparm || !irq_ptr) {
		ccw_device_get_schid(cdev, &schid);
		DBF_ERROR("qint:%4x", schid.sch_no);
		return;
	}

	if (irq_ptr->perf_stat_enabled)
		irq_ptr->perf_stat.qdio_int++;

	if (IS_ERR(irb)) {
		DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
		wake_up(&cdev->private->wait_q);
		return;
	}
	qdio_irq_check_sense(irq_ptr, irb);
	cstat = irb->scsw.cmd.cstat;
	dstat = irb->scsw.cmd.dstat;

	switch (irq_ptr->state) {
	case QDIO_IRQ_STATE_INACTIVE:
		qdio_establish_handle_irq(cdev, cstat, dstat);
		break;
	case QDIO_IRQ_STATE_CLEANUP:
		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
		break;
	case QDIO_IRQ_STATE_ESTABLISHED:
	case QDIO_IRQ_STATE_ACTIVE:
		if (cstat & SCHN_STAT_PCI) {
			qdio_int_handler_pci(irq_ptr);
			return;
		}
		if (cstat || dstat)
			qdio_handle_activate_check(cdev, intparm, cstat,
						   dstat);
		break;
	case QDIO_IRQ_STATE_STOPPED:
		break;
	default:
		WARN_ON_ONCE(1);
	}
	wake_up(&cdev->private->wait_q);
}

/**
 * qdio_get_ssqd_desc - get qdio subchannel description
 * @cdev: ccw device to get description for
 * @data: where to store the ssqd
 *
 * Returns 0 or an error code. The results of the chsc are stored in the
 * specified structure.
 */
int qdio_get_ssqd_desc(struct ccw_device *cdev,
		       struct qdio_ssqd_desc *data)
{
	struct subchannel_id schid;

	if (!cdev || !cdev->private)
		return -EINVAL;

	ccw_device_get_schid(cdev, &schid);
	DBF_EVENT("get ssqd:%4x", schid.sch_no);
	return qdio_setup_get_ssqd(NULL, &schid, data);
}
EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);

static void qdio_shutdown_queues(struct ccw_device *cdev)
{
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
	struct qdio_q *q;
	int i;

	for_each_input_queue(irq_ptr, q, i)
		tasklet_kill(&q->tasklet);

	for_each_output_queue(irq_ptr, q, i) {
		del_timer_sync(&q->u.out.timer);
		tasklet_kill(&q->tasklet);
	}
}

/**
 * qdio_shutdown - shut down a qdio subchannel
 * @cdev: associated ccw device
 * @how: use halt or clear to shutdown
 */
int qdio_shutdown(struct ccw_device *cdev, int how)
{
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
	struct subchannel_id schid;
	int rc;

	if (!irq_ptr)
		return -ENODEV;

	WARN_ON_ONCE(irqs_disabled());
	ccw_device_get_schid(cdev, &schid);
	DBF_EVENT("qshutdown:%4x", schid.sch_no);

	mutex_lock(&irq_ptr->setup_mutex);
	/*
	 * Subchannel was already shot down. We cannot prevent being called
	 * twice since cio may trigger a shutdown asynchronously.
	 */
	if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
		mutex_unlock(&irq_ptr->setup_mutex);
		return 0;
	}

	/*
	 * Indicate that the device is going down. Scheduling the queue
	 * tasklets is forbidden from here on.
	 */
	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);

	tiqdio_remove_input_queues(irq_ptr);
	qdio_shutdown_queues(cdev);
	qdio_shutdown_debug_entries(irq_ptr);

	/* cleanup subchannel */
	spin_lock_irq(get_ccwdev_lock(cdev));

	if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
		rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
	else
		/* default behaviour is halt */
		rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
	if (rc) {
		DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
		DBF_ERROR("rc:%4d", rc);
		goto no_cleanup;
	}

	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
	spin_unlock_irq(get_ccwdev_lock(cdev));
	wait_event_interruptible_timeout(cdev->private->wait_q,
		irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
		irq_ptr->state == QDIO_IRQ_STATE_ERR,
		10 * HZ);
	spin_lock_irq(get_ccwdev_lock(cdev));

no_cleanup:
	qdio_shutdown_thinint(irq_ptr);

	/* restore interrupt handler */
	if ((void *)cdev->handler == (void *)qdio_int_handler) {
		cdev->handler = irq_ptr->orig_handler;
		cdev->private->intparm = 0;
	}
	spin_unlock_irq(get_ccwdev_lock(cdev));

	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
	mutex_unlock(&irq_ptr->setup_mutex);
	if (rc)
		return rc;
	return 0;
}
EXPORT_SYMBOL_GPL(qdio_shutdown);

/**
 * qdio_free - free data structures for a qdio subchannel
 * @cdev: associated ccw device
 */
int qdio_free(struct ccw_device *cdev)
{
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
	struct subchannel_id schid;

	if (!irq_ptr)
		return -ENODEV;

	ccw_device_get_schid(cdev, &schid);
	DBF_EVENT("qfree:%4x", schid.sch_no);
	DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
	mutex_lock(&irq_ptr->setup_mutex);

	irq_ptr->debug_area = NULL;
	cdev->private->qdio_data = NULL;
	mutex_unlock(&irq_ptr->setup_mutex);

	qdio_release_memory(irq_ptr);
	return 0;
}
EXPORT_SYMBOL_GPL(qdio_free);

/**
 * qdio_allocate - allocate qdio queues and associated data
 * @init_data: initialization data
 */
int qdio_allocate(struct qdio_initialize *init_data)
{
	struct subchannel_id schid;
	struct qdio_irq *irq_ptr;

	ccw_device_get_schid(init_data->cdev, &schid);
	DBF_EVENT("qallocate:%4x", schid.sch_no);

	if ((init_data->no_input_qs && !init_data->input_handler) ||
	    (init_data->no_output_qs && !init_data->output_handler))
		return -EINVAL;

	if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
	    (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
		return -EINVAL;

	if ((!init_data->input_sbal_addr_array) ||
	    (!init_data->output_sbal_addr_array))
		return -EINVAL;

	/* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
	irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!irq_ptr)
		goto out_err;

	mutex_init(&irq_ptr->setup_mutex);
	if (qdio_allocate_dbf(init_data, irq_ptr))
		goto out_rel;

	/*
	 * Allocate a page for the chsc calls in qdio_establish.
	 * Must be pre-allocated since a zfcp recovery will call
	 * qdio_establish. In case of low memory and swap on a zfcp disk
	 * we may not be able to allocate memory otherwise.
	 */
	irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
	if (!irq_ptr->chsc_page)
		goto out_rel;

	/* qdr is used in ccw1.cda which is u32 */
	irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!irq_ptr->qdr)
		goto out_rel;

	if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
			     init_data->no_output_qs))
		goto out_rel;

	init_data->cdev->private->qdio_data = irq_ptr;
	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
	return 0;
out_rel:
	qdio_release_memory(irq_ptr);
out_err:
	return -ENOMEM;
}
EXPORT_SYMBOL_GPL(qdio_allocate);

static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
{
	struct qdio_q *q = irq_ptr->input_qs[0];
	int i, use_cq = 0;

	if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
		use_cq = 1;

	for_each_output_queue(irq_ptr, q, i) {
		if (use_cq) {
			if (qdio_enable_async_operation(&q->u.out) < 0) {
				use_cq = 0;
				continue;
			}
		} else
			qdio_disable_async_operation(&q->u.out);
	}
	DBF_EVENT("use_cq:%d", use_cq);
}

/**
 * qdio_establish - establish queues on a qdio subchannel
 * @init_data: initialization data
 */
int qdio_establish(struct qdio_initialize *init_data)
{
	struct ccw_device *cdev = init_data->cdev;
	struct subchannel_id schid;
	struct qdio_irq *irq_ptr;
	int rc;

	ccw_device_get_schid(cdev, &schid);
	DBF_EVENT("qestablish:%4x", schid.sch_no);

	irq_ptr = cdev->private->qdio_data;
	if (!irq_ptr)
		return -ENODEV;

	mutex_lock(&irq_ptr->setup_mutex);
	qdio_setup_irq(init_data);

	rc = qdio_establish_thinint(irq_ptr);
	if (rc) {
		mutex_unlock(&irq_ptr->setup_mutex);
		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
		return rc;
	}

	/* establish q */
	irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
	irq_ptr->ccw.flags = CCW_FLAG_SLI;
	irq_ptr->ccw.count = irq_ptr->equeue.count;
	irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);

	spin_lock_irq(get_ccwdev_lock(cdev));
	ccw_device_set_options_mask(cdev, 0);

	rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
	spin_unlock_irq(get_ccwdev_lock(cdev));
	if (rc) {
		DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
		DBF_ERROR("rc:%4x", rc);
		mutex_unlock(&irq_ptr->setup_mutex);
		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
		return rc;
	}

	wait_event_interruptible_timeout(cdev->private->wait_q,
		irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
		irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);

	if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
		mutex_unlock(&irq_ptr->setup_mutex);
		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
		return -EIO;
	}

	qdio_setup_ssqd_info(irq_ptr);

	qdio_detect_hsicq(irq_ptr);

	/* qebsm is now setup if available, initialize buffer states */
	qdio_init_buf_states(irq_ptr);

	mutex_unlock(&irq_ptr->setup_mutex);
	qdio_print_subchannel_info(irq_ptr, cdev);
	qdio_setup_debug_entries(irq_ptr, cdev);
	return 0;
}
EXPORT_SYMBOL_GPL(qdio_establish);

/**
 * qdio_activate - activate queues on a qdio subchannel
 * @cdev: associated cdev
 */
int qdio_activate(struct ccw_device *cdev)
{
	struct subchannel_id schid;
	struct qdio_irq *irq_ptr;
	int rc;

	ccw_device_get_schid(cdev, &schid);
	DBF_EVENT("qactivate:%4x", schid.sch_no);

	irq_ptr = cdev->private->qdio_data;
	if (!irq_ptr)
		return -ENODEV;

	mutex_lock(&irq_ptr->setup_mutex);
	if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
		rc = -EBUSY;
		goto out;
	}

	irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
	irq_ptr->ccw.flags = CCW_FLAG_SLI;
	irq_ptr->ccw.count = irq_ptr->aqueue.count;
	irq_ptr->ccw.cda = 0;

	spin_lock_irq(get_ccwdev_lock(cdev));
	ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);

	rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
			      0, DOIO_DENY_PREFETCH);
	spin_unlock_irq(get_ccwdev_lock(cdev));
	if (rc) {
		DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
		DBF_ERROR("rc:%4x", rc);
		goto out;
	}

	if (is_thinint_irq(irq_ptr))
		tiqdio_add_input_queues(irq_ptr);

	/* wait for subchannel to become active */
	msleep(5);

	switch (irq_ptr->state) {
	case QDIO_IRQ_STATE_STOPPED:
	case QDIO_IRQ_STATE_ERR:
		rc = -EIO;
		break;
	default:
		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
		rc = 0;
	}
out:
	mutex_unlock(&irq_ptr->setup_mutex);
	return rc;
}
EXPORT_SYMBOL_GPL(qdio_activate);

static inline int buf_in_between(int bufnr, int start, int count)
{
	int end = add_buf(start, count);

	if (end > start) {
		if (bufnr >= start && bufnr < end)
			return 1;
		else
			return 0;
	}

	/* wrap-around case */
	if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
	    (bufnr < end))
		return 1;
	else
		return 0;
}

/**
 * handle_inbound - reset processed input buffers
 * @q: queue containing the buffers
 * @callflags: flags
 * @bufnr: first buffer to process
 * @count: how many buffers are emptied
 */
static int handle_inbound(struct qdio_q *q, unsigned int callflags,
			  int bufnr, int count)
{
	int diff;

	qperf_inc(q, inbound_call);

	if (!q->u.in.polling)
		goto set;

	/* protect against stop polling setting an ACK for an emptied slsb */
	if (count == QDIO_MAX_BUFFERS_PER_Q) {
		/* overwriting everything, just delete polling status */
		q->u.in.polling = 0;
		q->u.in.ack_count = 0;
		goto set;
	} else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
		if (is_qebsm(q)) {
			/* partial overwrite, just update ack_start */
			diff = add_buf(bufnr, count);
			diff = sub_buf(diff, q->u.in.ack_start);
			q->u.in.ack_count -= diff;
			if (q->u.in.ack_count <= 0) {
				q->u.in.polling = 0;
				q->u.in.ack_count = 0;
				goto set;
			}
			q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
		}
		else
			/* the only ACK will be deleted, so stop polling */
			q->u.in.polling = 0;
	}

set:
	count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
	atomic_add(count, &q->nr_buf_used);

	if (need_siga_in(q))
		return qdio_siga_input(q);

	return 0;
}

/**
 * handle_outbound - process filled outbound buffers
 * @q: queue containing the buffers
 * @callflags: flags
 * @bufnr: first buffer to process
 * @count: how many buffers are filled
 */
static int handle_outbound(struct qdio_q *q, unsigned int callflags,
			   int bufnr, int count)
{
	unsigned char state = 0;
	int used, rc = 0;

	qperf_inc(q, outbound_call);

	count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
	used = atomic_add_return(count, &q->nr_buf_used);

	if (used == QDIO_MAX_BUFFERS_PER_Q)
		qperf_inc(q, outbound_queue_full);

	if (callflags & QDIO_FLAG_PCI_OUT) {
		q->u.out.pci_out_enabled = 1;
		qperf_inc(q, pci_request_int);
	} else
		q->u.out.pci_out_enabled = 0;

	if (queue_type(q) == QDIO_IQDIO_QFMT) {
		unsigned long phys_aob = 0;

		/* One SIGA-W per buffer required for unicast HSI */
		WARN_ON_ONCE(count > 1 && !multicast_outbound(q));

		phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);

		rc = qdio_kick_outbound_q(q, phys_aob);
	} else if (need_siga_sync(q)) {
		rc = qdio_siga_sync_q(q);
	} else {
		/* try to fast requeue buffers */
		get_buf_state(q, prev_buf(bufnr), &state, 0);
		if (state != SLSB_CU_OUTPUT_PRIMED)
			rc = qdio_kick_outbound_q(q, 0);
		else
			qperf_inc(q, fast_requeue);
	}

	/* in case of SIGA errors we must process the error immediately */
	if (used >= q->u.out.scan_threshold || rc)
		qdio_tasklet_schedule(q);
	else
		/* free the SBALs in case of no further traffic */
		if (!timer_pending(&q->u.out.timer) &&
		    likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
			mod_timer(&q->u.out.timer, jiffies + HZ);
	return rc;
}

/**
 * do_QDIO - process input or output buffers
 * @cdev: associated ccw_device for the qdio subchannel
 * @callflags: input or output and special flags from the program
 * @q_nr: queue number
 * @bufnr: buffer number
 * @count: how many buffers to process
 */
int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
	    int q_nr, unsigned int bufnr, unsigned int count)
{
	struct qdio_irq *irq_ptr;

	if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
		return -EINVAL;

	irq_ptr = cdev->private->qdio_data;
	if (!irq_ptr)
		return -ENODEV;

	DBF_DEV_EVENT(DBF_INFO, irq_ptr,
		      "do%02x b:%02x c:%02x", callflags, bufnr, count);

	if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
		return -EIO;
	if (!count)
		return 0;
	if (callflags & QDIO_FLAG_SYNC_INPUT)
		return handle_inbound(irq_ptr->input_qs[q_nr],
				      callflags, bufnr, count);
	else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
		return handle_outbound(irq_ptr->output_qs[q_nr],
				       callflags, bufnr, count);
	return -EINVAL;
}
EXPORT_SYMBOL_GPL(do_QDIO);

/**
 * qdio_start_irq - process input buffers
 * @cdev: associated ccw_device for the qdio subchannel
 * @nr: input queue number
 *
 * Return codes
 *   0 - success
 *   1 - irqs not started since new data is available
 */
int qdio_start_irq(struct ccw_device *cdev, int nr)
{
	struct qdio_q *q;
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;

	if (!irq_ptr)
		return -ENODEV;
	q = irq_ptr->input_qs[nr];

	clear_nonshared_ind(irq_ptr);
	qdio_stop_polling(q);
	clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);

	/*
	 * We need to check again to not lose initiative after
	 * resetting the ACK state.
	 */
	if (test_nonshared_ind(irq_ptr))
		goto rescan;
	if (!qdio_inbound_q_done(q, q->first_to_check))
		goto rescan;
	return 0;

rescan:
	if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
			     &q->u.in.queue_irq_state))
		return 0;
	else
		return 1;

}
EXPORT_SYMBOL(qdio_start_irq);

/**
 * qdio_get_next_buffers - process input buffers
 * @cdev: associated ccw_device for the qdio subchannel
 * @nr: input queue number
 * @bufnr: first filled buffer number
 * @error: buffers are in error state
 *
 * Return codes
 *   < 0 - error
 *   = 0 - no new buffers found
 *   > 0 - number of processed buffers
 */
int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
			  int *error)
{
	struct qdio_q *q;
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
	unsigned int start;
	int count;

	if (!irq_ptr)
		return -ENODEV;
	q = irq_ptr->input_qs[nr];
	start = q->first_to_check;

	/*
	 * Cannot rely on automatic sync after interrupt since queues may
	 * also be examined without interrupt.
	 */
	if (need_siga_sync(q))
		qdio_sync_queues(q);

	qdio_check_outbound_pci_queues(irq_ptr);

	count = qdio_inbound_q_moved(q, start);
	if (count == 0)
		return 0;

	start = add_buf(start, count);
	q->first_to_check = start;

	/* Note: upper-layer MUST stop processing immediately here ... */
	if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
		return -EIO;

	*bufnr = q->first_to_kick;
	*error = q->qdio_error;

	/* for the next time */
	q->first_to_kick = add_buf(q->first_to_kick, count);
	q->qdio_error = 0;

	return count;
}
EXPORT_SYMBOL(qdio_get_next_buffers);

/**
 * qdio_stop_irq - disable interrupt processing for the device
 * @cdev: associated ccw_device for the qdio subchannel
 * @nr: input queue number
 *
 * Return codes
 *   0 - interrupts were already disabled
 *   1 - interrupts successfully disabled
 */
int qdio_stop_irq(struct ccw_device *cdev, int nr)
{
	struct qdio_q *q;
	struct qdio_irq *irq_ptr = cdev->private->qdio_data;

	if (!irq_ptr)
		return -ENODEV;
	q = irq_ptr->input_qs[nr];

	if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
			     &q->u.in.queue_irq_state))
		return 0;
	else
		return 1;
}
EXPORT_SYMBOL(qdio_stop_irq);

/**
 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
 * @schid:		Subchannel ID.
 * @cnc:		Boolean Change-Notification Control
 * @response:		Response code will be stored at this address
 * @cb: 		Callback function will be executed for each element
 *			of the address list
 * @priv:		Pointer to pass to the callback function.
 *
 * Performs "Store-network-bridging-information list" operation and calls
 * the callback function for every entry in the list. If "change-
 * notification-control" is set, further changes in the address list
 * will be reported via the IPA command.
 */
int qdio_pnso_brinfo(struct subchannel_id schid,
		int cnc, u16 *response,
		void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
				void *entry),
		void *priv)
{
	struct chsc_pnso_area *rr;
	int rc;
	u32 prev_instance = 0;
	int isfirstblock = 1;
	int i, size, elems;

	rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
	if (rr == NULL)
		return -ENOMEM;
	do {
		/* on the first iteration, naihdr.resume_token will be zero */
		rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
		if (rc != 0 && rc != -EBUSY)
			goto out;
		if (rr->response.code != 1) {
			rc = -EIO;
			continue;
		} else
			rc = 0;

		if (cb == NULL)
			continue;

		size = rr->naihdr.naids;
		elems = (rr->response.length -
				sizeof(struct chsc_header) -
				sizeof(struct chsc_brinfo_naihdr)) /
				size;

		if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
			/* Inform the caller that they need to scrap */
			/* the data that was already reported via cb */
				rc = -EAGAIN;
				break;
		}
		isfirstblock = 0;
		prev_instance = rr->naihdr.instance;
		for (i = 0; i < elems; i++)
			switch (size) {
			case sizeof(struct qdio_brinfo_entry_l3_ipv6):
				(*cb)(priv, l3_ipv6_addr,
						&rr->entries.l3_ipv6[i]);
				break;
			case sizeof(struct qdio_brinfo_entry_l3_ipv4):
				(*cb)(priv, l3_ipv4_addr,
						&rr->entries.l3_ipv4[i]);
				break;
			case sizeof(struct qdio_brinfo_entry_l2):
				(*cb)(priv, l2_addr_lnid,
						&rr->entries.l2[i]);
				break;
			default:
				WARN_ON_ONCE(1);
				rc = -EIO;
				goto out;
			}
	} while (rr->response.code == 0x0107 ||  /* channel busy */
		  (rr->response.code == 1 && /* list stored */
		   /* resume token is non-zero => list incomplete */
		   (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
	(*response) = rr->response.code;

out:
	free_page((unsigned long)rr);
	return rc;
}
EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);

static int __init init_QDIO(void)
{
	int rc;

	rc = qdio_debug_init();
	if (rc)
		return rc;
	rc = qdio_setup_init();
	if (rc)
		goto out_debug;
	rc = tiqdio_allocate_memory();
	if (rc)
		goto out_cache;
	rc = tiqdio_register_thinints();
	if (rc)
		goto out_ti;
	return 0;

out_ti:
	tiqdio_free_memory();
out_cache:
	qdio_setup_exit();
out_debug:
	qdio_debug_exit();
	return rc;
}

static void __exit exit_QDIO(void)
{
	tiqdio_unregister_thinints();
	tiqdio_free_memory();
	qdio_setup_exit();
	qdio_debug_exit();
}

module_init(init_QDIO);
module_exit(exit_QDIO);