summaryrefslogtreecommitdiff
path: root/drivers/s390/crypto/ap_bus.c
blob: 439c1f6d2866612e83e21fdb1e9f54974d12d467 (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
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright IBM Corp. 2006, 2021
 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
 *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
 *	      Ralph Wuerthner <rwuerthn@de.ibm.com>
 *	      Felix Beck <felix.beck@de.ibm.com>
 *	      Holger Dengler <hd@linux.vnet.ibm.com>
 *	      Harald Freudenberger <freude@linux.ibm.com>
 *
 * Adjunct processor bus.
 */

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

#include <linux/kernel_stat.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/freezer.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <asm/airq.h>
#include <linux/atomic.h>
#include <asm/isc.h>
#include <linux/hrtimer.h>
#include <linux/ktime.h>
#include <asm/facility.h>
#include <linux/crypto.h>
#include <linux/mod_devicetable.h>
#include <linux/debugfs.h>
#include <linux/ctype.h>

#include "ap_bus.h"
#include "ap_debug.h"

/*
 * Module parameters; note though this file itself isn't modular.
 */
int ap_domain_index = -1;	/* Adjunct Processor Domain Index */
static DEFINE_SPINLOCK(ap_domain_lock);
module_param_named(domain, ap_domain_index, int, 0440);
MODULE_PARM_DESC(domain, "domain index for ap devices");
EXPORT_SYMBOL(ap_domain_index);

static int ap_thread_flag;
module_param_named(poll_thread, ap_thread_flag, int, 0440);
MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");

static char *apm_str;
module_param_named(apmask, apm_str, charp, 0440);
MODULE_PARM_DESC(apmask, "AP bus adapter mask.");

static char *aqm_str;
module_param_named(aqmask, aqm_str, charp, 0440);
MODULE_PARM_DESC(aqmask, "AP bus domain mask.");

atomic_t ap_max_msg_size = ATOMIC_INIT(AP_DEFAULT_MAX_MSG_SIZE);
EXPORT_SYMBOL(ap_max_msg_size);

static struct device *ap_root_device;

/* Hashtable of all queue devices on the AP bus */
DEFINE_HASHTABLE(ap_queues, 8);
/* lock used for the ap_queues hashtable */
DEFINE_SPINLOCK(ap_queues_lock);

/* Default permissions (ioctl, card and domain masking) */
struct ap_perms ap_perms;
EXPORT_SYMBOL(ap_perms);
DEFINE_MUTEX(ap_perms_mutex);
EXPORT_SYMBOL(ap_perms_mutex);

/* # of bus scans since init */
static atomic64_t ap_scan_bus_count;

/* # of bindings complete since init */
static atomic64_t ap_bindings_complete_count = ATOMIC64_INIT(0);

/* completion for initial APQN bindings complete */
static DECLARE_COMPLETION(ap_init_apqn_bindings_complete);

static struct ap_config_info *ap_qci_info;

/*
 * AP bus related debug feature things.
 */
debug_info_t *ap_dbf_info;

/*
 * Workqueue timer for bus rescan.
 */
static struct timer_list ap_config_timer;
static int ap_config_time = AP_CONFIG_TIME;
static void ap_scan_bus(struct work_struct *);
static DECLARE_WORK(ap_scan_work, ap_scan_bus);

/*
 * Tasklet & timer for AP request polling and interrupts
 */
static void ap_tasklet_fn(unsigned long);
static DECLARE_TASKLET_OLD(ap_tasklet, ap_tasklet_fn);
static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
static struct task_struct *ap_poll_kthread;
static DEFINE_MUTEX(ap_poll_thread_mutex);
static DEFINE_SPINLOCK(ap_poll_timer_lock);
static struct hrtimer ap_poll_timer;
/*
 * In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.
 */
static unsigned long long poll_timeout = 250000;

/* Maximum domain id, if not given via qci */
static int ap_max_domain_id = 15;
/* Maximum adapter id, if not given via qci */
static int ap_max_adapter_id = 63;

static struct bus_type ap_bus_type;

/* Adapter interrupt definitions */
static void ap_interrupt_handler(struct airq_struct *airq, bool floating);

static bool ap_irq_flag;

static struct airq_struct ap_airq = {
	.handler = ap_interrupt_handler,
	.isc = AP_ISC,
};

/**
 * ap_airq_ptr() - Get the address of the adapter interrupt indicator
 *
 * Returns the address of the local-summary-indicator of the adapter
 * interrupt handler for AP, or NULL if adapter interrupts are not
 * available.
 */
void *ap_airq_ptr(void)
{
	if (ap_irq_flag)
		return ap_airq.lsi_ptr;
	return NULL;
}

/**
 * ap_interrupts_available(): Test if AP interrupts are available.
 *
 * Returns 1 if AP interrupts are available.
 */
static int ap_interrupts_available(void)
{
	return test_facility(65);
}

/**
 * ap_qci_available(): Test if AP configuration
 * information can be queried via QCI subfunction.
 *
 * Returns 1 if subfunction PQAP(QCI) is available.
 */
static int ap_qci_available(void)
{
	return test_facility(12);
}

/**
 * ap_apft_available(): Test if AP facilities test (APFT)
 * facility is available.
 *
 * Returns 1 if APFT is is available.
 */
static int ap_apft_available(void)
{
	return test_facility(15);
}

/*
 * ap_qact_available(): Test if the PQAP(QACT) subfunction is available.
 *
 * Returns 1 if the QACT subfunction is available.
 */
static inline int ap_qact_available(void)
{
	if (ap_qci_info)
		return ap_qci_info->qact;
	return 0;
}

/*
 * ap_fetch_qci_info(): Fetch cryptographic config info
 *
 * Returns the ap configuration info fetched via PQAP(QCI).
 * On success 0 is returned, on failure a negative errno
 * is returned, e.g. if the PQAP(QCI) instruction is not
 * available, the return value will be -EOPNOTSUPP.
 */
static inline int ap_fetch_qci_info(struct ap_config_info *info)
{
	if (!ap_qci_available())
		return -EOPNOTSUPP;
	if (!info)
		return -EINVAL;
	return ap_qci(info);
}

/**
 * ap_init_qci_info(): Allocate and query qci config info.
 * Does also update the static variables ap_max_domain_id
 * and ap_max_adapter_id if this info is available.

 */
static void __init ap_init_qci_info(void)
{
	if (!ap_qci_available()) {
		AP_DBF_INFO("%s QCI not supported\n", __func__);
		return;
	}

	ap_qci_info = kzalloc(sizeof(*ap_qci_info), GFP_KERNEL);
	if (!ap_qci_info)
		return;
	if (ap_fetch_qci_info(ap_qci_info) != 0) {
		kfree(ap_qci_info);
		ap_qci_info = NULL;
		return;
	}
	AP_DBF_INFO("%s successful fetched initial qci info\n", __func__);

	if (ap_qci_info->apxa) {
		if (ap_qci_info->Na) {
			ap_max_adapter_id = ap_qci_info->Na;
			AP_DBF_INFO("%s new ap_max_adapter_id is %d\n",
				    __func__, ap_max_adapter_id);
		}
		if (ap_qci_info->Nd) {
			ap_max_domain_id = ap_qci_info->Nd;
			AP_DBF_INFO("%s new ap_max_domain_id is %d\n",
				    __func__, ap_max_domain_id);
		}
	}
}

/*
 * ap_test_config(): helper function to extract the nrth bit
 *		     within the unsigned int array field.
 */
static inline int ap_test_config(unsigned int *field, unsigned int nr)
{
	return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
}

/*
 * ap_test_config_card_id(): Test, whether an AP card ID is configured.
 *
 * Returns 0 if the card is not configured
 *	   1 if the card is configured or
 *	     if the configuration information is not available
 */
static inline int ap_test_config_card_id(unsigned int id)
{
	if (id > ap_max_adapter_id)
		return 0;
	if (ap_qci_info)
		return ap_test_config(ap_qci_info->apm, id);
	return 1;
}

/*
 * ap_test_config_usage_domain(): Test, whether an AP usage domain
 * is configured.
 *
 * Returns 0 if the usage domain is not configured
 *	   1 if the usage domain is configured or
 *	     if the configuration information is not available
 */
int ap_test_config_usage_domain(unsigned int domain)
{
	if (domain > ap_max_domain_id)
		return 0;
	if (ap_qci_info)
		return ap_test_config(ap_qci_info->aqm, domain);
	return 1;
}
EXPORT_SYMBOL(ap_test_config_usage_domain);

/*
 * ap_test_config_ctrl_domain(): Test, whether an AP control domain
 * is configured.
 * @domain AP control domain ID
 *
 * Returns 1 if the control domain is configured
 *	   0 in all other cases
 */
int ap_test_config_ctrl_domain(unsigned int domain)
{
	if (!ap_qci_info || domain > ap_max_domain_id)
		return 0;
	return ap_test_config(ap_qci_info->adm, domain);
}
EXPORT_SYMBOL(ap_test_config_ctrl_domain);

/*
 * ap_queue_info(): Check and get AP queue info.
 * Returns true if TAPQ succeeded and the info is filled or
 * false otherwise.
 */
static bool ap_queue_info(ap_qid_t qid, int *q_type, unsigned int *q_fac,
			  int *q_depth, int *q_ml, bool *q_decfg)
{
	struct ap_queue_status status;
	union {
		unsigned long value;
		struct {
			unsigned int fac   : 32; /* facility bits */
			unsigned int at	   :  8; /* ap type */
			unsigned int _res1 :  8;
			unsigned int _res2 :  4;
			unsigned int ml	   :  4; /* apxl ml */
			unsigned int _res3 :  4;
			unsigned int qd	   :  4; /* queue depth */
		} tapq_gr2;
	} tapq_info;

	tapq_info.value = 0;

	/* make sure we don't run into a specifiation exception */
	if (AP_QID_CARD(qid) > ap_max_adapter_id ||
	    AP_QID_QUEUE(qid) > ap_max_domain_id)
		return false;

	/* call TAPQ on this APQN */
	status = ap_test_queue(qid, ap_apft_available(), &tapq_info.value);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
	case AP_RESPONSE_RESET_IN_PROGRESS:
	case AP_RESPONSE_DECONFIGURED:
	case AP_RESPONSE_CHECKSTOPPED:
	case AP_RESPONSE_BUSY:
		/*
		 * According to the architecture in all these cases the
		 * info should be filled. All bits 0 is not possible as
		 * there is at least one of the mode bits set.
		 */
		if (WARN_ON_ONCE(!tapq_info.value))
			return false;
		*q_type = tapq_info.tapq_gr2.at;
		*q_fac = tapq_info.tapq_gr2.fac;
		*q_depth = tapq_info.tapq_gr2.qd;
		*q_ml = tapq_info.tapq_gr2.ml;
		*q_decfg = status.response_code == AP_RESPONSE_DECONFIGURED;
		switch (*q_type) {
			/* For CEX2 and CEX3 the available functions
			 * are not reflected by the facilities bits.
			 * Instead it is coded into the type. So here
			 * modify the function bits based on the type.
			 */
		case AP_DEVICE_TYPE_CEX2A:
		case AP_DEVICE_TYPE_CEX3A:
			*q_fac |= 0x08000000;
			break;
		case AP_DEVICE_TYPE_CEX2C:
		case AP_DEVICE_TYPE_CEX3C:
			*q_fac |= 0x10000000;
			break;
		default:
			break;
		}
		return true;
	default:
		/*
		 * A response code which indicates, there is no info available.
		 */
		return false;
	}
}

void ap_wait(enum ap_sm_wait wait)
{
	ktime_t hr_time;

	switch (wait) {
	case AP_SM_WAIT_AGAIN:
	case AP_SM_WAIT_INTERRUPT:
		if (ap_irq_flag)
			break;
		if (ap_poll_kthread) {
			wake_up(&ap_poll_wait);
			break;
		}
		fallthrough;
	case AP_SM_WAIT_TIMEOUT:
		spin_lock_bh(&ap_poll_timer_lock);
		if (!hrtimer_is_queued(&ap_poll_timer)) {
			hr_time = poll_timeout;
			hrtimer_forward_now(&ap_poll_timer, hr_time);
			hrtimer_restart(&ap_poll_timer);
		}
		spin_unlock_bh(&ap_poll_timer_lock);
		break;
	case AP_SM_WAIT_NONE:
	default:
		break;
	}
}

/**
 * ap_request_timeout(): Handling of request timeouts
 * @t: timer making this callback
 *
 * Handles request timeouts.
 */
void ap_request_timeout(struct timer_list *t)
{
	struct ap_queue *aq = from_timer(aq, t, timeout);

	spin_lock_bh(&aq->lock);
	ap_wait(ap_sm_event(aq, AP_SM_EVENT_TIMEOUT));
	spin_unlock_bh(&aq->lock);
}

/**
 * ap_poll_timeout(): AP receive polling for finished AP requests.
 * @unused: Unused pointer.
 *
 * Schedules the AP tasklet using a high resolution timer.
 */
static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
{
	tasklet_schedule(&ap_tasklet);
	return HRTIMER_NORESTART;
}

/**
 * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
 * @airq: pointer to adapter interrupt descriptor
 */
static void ap_interrupt_handler(struct airq_struct *airq, bool floating)
{
	inc_irq_stat(IRQIO_APB);
	tasklet_schedule(&ap_tasklet);
}

/**
 * ap_tasklet_fn(): Tasklet to poll all AP devices.
 * @dummy: Unused variable
 *
 * Poll all AP devices on the bus.
 */
static void ap_tasklet_fn(unsigned long dummy)
{
	int bkt;
	struct ap_queue *aq;
	enum ap_sm_wait wait = AP_SM_WAIT_NONE;

	/* Reset the indicator if interrupts are used. Thus new interrupts can
	 * be received. Doing it in the beginning of the tasklet is therefor
	 * important that no requests on any AP get lost.
	 */
	if (ap_irq_flag)
		xchg(ap_airq.lsi_ptr, 0);

	spin_lock_bh(&ap_queues_lock);
	hash_for_each(ap_queues, bkt, aq, hnode) {
		spin_lock_bh(&aq->lock);
		wait = min(wait, ap_sm_event_loop(aq, AP_SM_EVENT_POLL));
		spin_unlock_bh(&aq->lock);
	}
	spin_unlock_bh(&ap_queues_lock);

	ap_wait(wait);
}

static int ap_pending_requests(void)
{
	int bkt;
	struct ap_queue *aq;

	spin_lock_bh(&ap_queues_lock);
	hash_for_each(ap_queues, bkt, aq, hnode) {
		if (aq->queue_count == 0)
			continue;
		spin_unlock_bh(&ap_queues_lock);
		return 1;
	}
	spin_unlock_bh(&ap_queues_lock);
	return 0;
}

/**
 * ap_poll_thread(): Thread that polls for finished requests.
 * @data: Unused pointer
 *
 * AP bus poll thread. The purpose of this thread is to poll for
 * finished requests in a loop if there is a "free" cpu - that is
 * a cpu that doesn't have anything better to do. The polling stops
 * as soon as there is another task or if all messages have been
 * delivered.
 */
static int ap_poll_thread(void *data)
{
	DECLARE_WAITQUEUE(wait, current);

	set_user_nice(current, MAX_NICE);
	set_freezable();
	while (!kthread_should_stop()) {
		add_wait_queue(&ap_poll_wait, &wait);
		set_current_state(TASK_INTERRUPTIBLE);
		if (!ap_pending_requests()) {
			schedule();
			try_to_freeze();
		}
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&ap_poll_wait, &wait);
		if (need_resched()) {
			schedule();
			try_to_freeze();
			continue;
		}
		ap_tasklet_fn(0);
	}

	return 0;
}

static int ap_poll_thread_start(void)
{
	int rc;

	if (ap_irq_flag || ap_poll_kthread)
		return 0;
	mutex_lock(&ap_poll_thread_mutex);
	ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
	rc = PTR_ERR_OR_ZERO(ap_poll_kthread);
	if (rc)
		ap_poll_kthread = NULL;
	mutex_unlock(&ap_poll_thread_mutex);
	return rc;
}

static void ap_poll_thread_stop(void)
{
	if (!ap_poll_kthread)
		return;
	mutex_lock(&ap_poll_thread_mutex);
	kthread_stop(ap_poll_kthread);
	ap_poll_kthread = NULL;
	mutex_unlock(&ap_poll_thread_mutex);
}

#define is_card_dev(x) ((x)->parent == ap_root_device)
#define is_queue_dev(x) ((x)->parent != ap_root_device)

/**
 * ap_bus_match()
 * @dev: Pointer to device
 * @drv: Pointer to device_driver
 *
 * AP bus driver registration/unregistration.
 */
static int ap_bus_match(struct device *dev, struct device_driver *drv)
{
	struct ap_driver *ap_drv = to_ap_drv(drv);
	struct ap_device_id *id;

	/*
	 * Compare device type of the device with the list of
	 * supported types of the device_driver.
	 */
	for (id = ap_drv->ids; id->match_flags; id++) {
		if (is_card_dev(dev) &&
		    id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE &&
		    id->dev_type == to_ap_dev(dev)->device_type)
			return 1;
		if (is_queue_dev(dev) &&
		    id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE &&
		    id->dev_type == to_ap_dev(dev)->device_type)
			return 1;
	}
	return 0;
}

/**
 * ap_uevent(): Uevent function for AP devices.
 * @dev: Pointer to device
 * @env: Pointer to kobj_uevent_env
 *
 * It sets up a single environment variable DEV_TYPE which contains the
 * hardware device type.
 */
static int ap_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	int rc = 0;
	struct ap_device *ap_dev = to_ap_dev(dev);

	/* Uevents from ap bus core don't need extensions to the env */
	if (dev == ap_root_device)
		return 0;

	if (is_card_dev(dev)) {
		struct ap_card *ac = to_ap_card(&ap_dev->device);

		/* Set up DEV_TYPE environment variable. */
		rc = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
		if (rc)
			return rc;
		/* Add MODALIAS= */
		rc = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
		if (rc)
			return rc;

		/* Add MODE=<accel|cca|ep11> */
		if (ap_test_bit(&ac->functions, AP_FUNC_ACCEL))
			rc = add_uevent_var(env, "MODE=accel");
		else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO))
			rc = add_uevent_var(env, "MODE=cca");
		else if (ap_test_bit(&ac->functions, AP_FUNC_EP11))
			rc = add_uevent_var(env, "MODE=ep11");
		if (rc)
			return rc;
	} else {
		struct ap_queue *aq = to_ap_queue(&ap_dev->device);

		/* Add MODE=<accel|cca|ep11> */
		if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL))
			rc = add_uevent_var(env, "MODE=accel");
		else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO))
			rc = add_uevent_var(env, "MODE=cca");
		else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11))
			rc = add_uevent_var(env, "MODE=ep11");
		if (rc)
			return rc;
	}

	return 0;
}

static void ap_send_init_scan_done_uevent(void)
{
	char *envp[] = { "INITSCAN=done", NULL };

	kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);
}

static void ap_send_bindings_complete_uevent(void)
{
	char buf[32];
	char *envp[] = { "BINDINGS=complete", buf, NULL };

	snprintf(buf, sizeof(buf), "COMPLETECOUNT=%llu",
		 atomic64_inc_return(&ap_bindings_complete_count));
	kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);
}

void ap_send_config_uevent(struct ap_device *ap_dev, bool cfg)
{
	char buf[16];
	char *envp[] = { buf, NULL };

	snprintf(buf, sizeof(buf), "CONFIG=%d", cfg ? 1 : 0);

	kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(ap_send_config_uevent);

void ap_send_online_uevent(struct ap_device *ap_dev, int online)
{
	char buf[16];
	char *envp[] = { buf, NULL };

	snprintf(buf, sizeof(buf), "ONLINE=%d", online ? 1 : 0);

	kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(ap_send_online_uevent);

/*
 * calc # of bound APQNs
 */

struct __ap_calc_ctrs {
	unsigned int apqns;
	unsigned int bound;
};

static int __ap_calc_helper(struct device *dev, void *arg)
{
	struct __ap_calc_ctrs *pctrs = (struct __ap_calc_ctrs *) arg;

	if (is_queue_dev(dev)) {
		pctrs->apqns++;
		if (dev->driver)
			pctrs->bound++;
	}

	return 0;
}

static void ap_calc_bound_apqns(unsigned int *apqns, unsigned int *bound)
{
	struct __ap_calc_ctrs ctrs;

	memset(&ctrs, 0, sizeof(ctrs));
	bus_for_each_dev(&ap_bus_type, NULL, (void *) &ctrs, __ap_calc_helper);

	*apqns = ctrs.apqns;
	*bound = ctrs.bound;
}

/*
 * After initial ap bus scan do check if all existing APQNs are
 * bound to device drivers.
 */
static void ap_check_bindings_complete(void)
{
	unsigned int apqns, bound;

	if (atomic64_read(&ap_scan_bus_count) >= 1) {
		ap_calc_bound_apqns(&apqns, &bound);
		if (bound == apqns) {
			if (!completion_done(&ap_init_apqn_bindings_complete)) {
				complete_all(&ap_init_apqn_bindings_complete);
				AP_DBF(DBF_INFO, "%s complete\n", __func__);
			}
			ap_send_bindings_complete_uevent();
		}
	}
}

/*
 * Interface to wait for the AP bus to have done one initial ap bus
 * scan and all detected APQNs have been bound to device drivers.
 * If these both conditions are not fulfilled, this function blocks
 * on a condition with wait_for_completion_interruptible_timeout().
 * If these both conditions are fulfilled (before the timeout hits)
 * the return value is 0. If the timeout (in jiffies) hits instead
 * -ETIME is returned. On failures negative return values are
 * returned to the caller.
 */
int ap_wait_init_apqn_bindings_complete(unsigned long timeout)
{
	long l;

	if (completion_done(&ap_init_apqn_bindings_complete))
		return 0;

	if (timeout)
		l = wait_for_completion_interruptible_timeout(
			&ap_init_apqn_bindings_complete, timeout);
	else
		l = wait_for_completion_interruptible(
			&ap_init_apqn_bindings_complete);
	if (l < 0)
		return l == -ERESTARTSYS ? -EINTR : l;
	else if (l == 0 && timeout)
		return -ETIME;

	return 0;
}
EXPORT_SYMBOL(ap_wait_init_apqn_bindings_complete);

static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data)
{
	if (is_queue_dev(dev) &&
	    AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data)
		device_unregister(dev);
	return 0;
}

static int __ap_revise_reserved(struct device *dev, void *dummy)
{
	int rc, card, queue, devres, drvres;

	if (is_queue_dev(dev)) {
		card = AP_QID_CARD(to_ap_queue(dev)->qid);
		queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
		mutex_lock(&ap_perms_mutex);
		devres = test_bit_inv(card, ap_perms.apm)
			&& test_bit_inv(queue, ap_perms.aqm);
		mutex_unlock(&ap_perms_mutex);
		drvres = to_ap_drv(dev->driver)->flags
			& AP_DRIVER_FLAG_DEFAULT;
		if (!!devres != !!drvres) {
			AP_DBF_DBG("reprobing queue=%02x.%04x\n",
				   card, queue);
			rc = device_reprobe(dev);
		}
	}

	return 0;
}

static void ap_bus_revise_bindings(void)
{
	bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved);
}

int ap_owned_by_def_drv(int card, int queue)
{
	int rc = 0;

	if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
		return -EINVAL;

	mutex_lock(&ap_perms_mutex);

	if (test_bit_inv(card, ap_perms.apm)
	    && test_bit_inv(queue, ap_perms.aqm))
		rc = 1;

	mutex_unlock(&ap_perms_mutex);

	return rc;
}
EXPORT_SYMBOL(ap_owned_by_def_drv);

int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
				       unsigned long *aqm)
{
	int card, queue, rc = 0;

	mutex_lock(&ap_perms_mutex);

	for (card = 0; !rc && card < AP_DEVICES; card++)
		if (test_bit_inv(card, apm) &&
		    test_bit_inv(card, ap_perms.apm))
			for (queue = 0; !rc && queue < AP_DOMAINS; queue++)
				if (test_bit_inv(queue, aqm) &&
				    test_bit_inv(queue, ap_perms.aqm))
					rc = 1;

	mutex_unlock(&ap_perms_mutex);

	return rc;
}
EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);

static int ap_device_probe(struct device *dev)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	struct ap_driver *ap_drv = to_ap_drv(dev->driver);
	int card, queue, devres, drvres, rc = -ENODEV;

	if (!get_device(dev))
		return rc;

	if (is_queue_dev(dev)) {
		/*
		 * If the apqn is marked as reserved/used by ap bus and
		 * default drivers, only probe with drivers with the default
		 * flag set. If it is not marked, only probe with drivers
		 * with the default flag not set.
		 */
		card = AP_QID_CARD(to_ap_queue(dev)->qid);
		queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
		mutex_lock(&ap_perms_mutex);
		devres = test_bit_inv(card, ap_perms.apm)
			&& test_bit_inv(queue, ap_perms.aqm);
		mutex_unlock(&ap_perms_mutex);
		drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT;
		if (!!devres != !!drvres)
			goto out;
	}

	/* Add queue/card to list of active queues/cards */
	spin_lock_bh(&ap_queues_lock);
	if (is_queue_dev(dev))
		hash_add(ap_queues, &to_ap_queue(dev)->hnode,
			 to_ap_queue(dev)->qid);
	spin_unlock_bh(&ap_queues_lock);

	rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;

	if (rc) {
		spin_lock_bh(&ap_queues_lock);
		if (is_queue_dev(dev))
			hash_del(&to_ap_queue(dev)->hnode);
		spin_unlock_bh(&ap_queues_lock);
	} else
		ap_check_bindings_complete();

out:
	if (rc)
		put_device(dev);
	return rc;
}

static int ap_device_remove(struct device *dev)
{
	struct ap_device *ap_dev = to_ap_dev(dev);
	struct ap_driver *ap_drv = to_ap_drv(dev->driver);

	/* prepare ap queue device removal */
	if (is_queue_dev(dev))
		ap_queue_prepare_remove(to_ap_queue(dev));

	/* driver's chance to clean up gracefully */
	if (ap_drv->remove)
		ap_drv->remove(ap_dev);

	/* now do the ap queue device remove */
	if (is_queue_dev(dev))
		ap_queue_remove(to_ap_queue(dev));

	/* Remove queue/card from list of active queues/cards */
	spin_lock_bh(&ap_queues_lock);
	if (is_queue_dev(dev))
		hash_del(&to_ap_queue(dev)->hnode);
	spin_unlock_bh(&ap_queues_lock);

	put_device(dev);

	return 0;
}

struct ap_queue *ap_get_qdev(ap_qid_t qid)
{
	int bkt;
	struct ap_queue *aq;

	spin_lock_bh(&ap_queues_lock);
	hash_for_each(ap_queues, bkt, aq, hnode) {
		if (aq->qid == qid) {
			get_device(&aq->ap_dev.device);
			spin_unlock_bh(&ap_queues_lock);
			return aq;
		}
	}
	spin_unlock_bh(&ap_queues_lock);

	return NULL;
}
EXPORT_SYMBOL(ap_get_qdev);

int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
		       char *name)
{
	struct device_driver *drv = &ap_drv->driver;

	drv->bus = &ap_bus_type;
	drv->owner = owner;
	drv->name = name;
	return driver_register(drv);
}
EXPORT_SYMBOL(ap_driver_register);

void ap_driver_unregister(struct ap_driver *ap_drv)
{
	driver_unregister(&ap_drv->driver);
}
EXPORT_SYMBOL(ap_driver_unregister);

void ap_bus_force_rescan(void)
{
	/* processing a asynchronous bus rescan */
	del_timer(&ap_config_timer);
	queue_work(system_long_wq, &ap_scan_work);
	flush_work(&ap_scan_work);
}
EXPORT_SYMBOL(ap_bus_force_rescan);

/*
* A config change has happened, force an ap bus rescan.
*/
void ap_bus_cfg_chg(void)
{
	AP_DBF_DBG("%s config change, forcing bus rescan\n", __func__);

	ap_bus_force_rescan();
}

/*
 * hex2bitmap() - parse hex mask string and set bitmap.
 * Valid strings are "0x012345678" with at least one valid hex number.
 * Rest of the bitmap to the right is padded with 0. No spaces allowed
 * within the string, the leading 0x may be omitted.
 * Returns the bitmask with exactly the bits set as given by the hex
 * string (both in big endian order).
 */
static int hex2bitmap(const char *str, unsigned long *bitmap, int bits)
{
	int i, n, b;

	/* bits needs to be a multiple of 8 */
	if (bits & 0x07)
		return -EINVAL;

	if (str[0] == '0' && str[1] == 'x')
		str++;
	if (*str == 'x')
		str++;

	for (i = 0; isxdigit(*str) && i < bits; str++) {
		b = hex_to_bin(*str);
		for (n = 0; n < 4; n++)
			if (b & (0x08 >> n))
				set_bit_inv(i + n, bitmap);
		i += 4;
	}

	if (*str == '\n')
		str++;
	if (*str)
		return -EINVAL;
	return 0;
}

/*
 * modify_bitmap() - parse bitmask argument and modify an existing
 * bit mask accordingly. A concatenation (done with ',') of these
 * terms is recognized:
 *   +<bitnr>[-<bitnr>] or -<bitnr>[-<bitnr>]
 * <bitnr> may be any valid number (hex, decimal or octal) in the range
 * 0...bits-1; the leading + or - is required. Here are some examples:
 *   +0-15,+32,-128,-0xFF
 *   -0-255,+1-16,+0x128
 *   +1,+2,+3,+4,-5,-7-10
 * Returns the new bitmap after all changes have been applied. Every
 * positive value in the string will set a bit and every negative value
 * in the string will clear a bit. As a bit may be touched more than once,
 * the last 'operation' wins:
 * +0-255,-128 = first bits 0-255 will be set, then bit 128 will be
 * cleared again. All other bits are unmodified.
 */
static int modify_bitmap(const char *str, unsigned long *bitmap, int bits)
{
	int a, i, z;
	char *np, sign;

	/* bits needs to be a multiple of 8 */
	if (bits & 0x07)
		return -EINVAL;

	while (*str) {
		sign = *str++;
		if (sign != '+' && sign != '-')
			return -EINVAL;
		a = z = simple_strtoul(str, &np, 0);
		if (str == np || a >= bits)
			return -EINVAL;
		str = np;
		if (*str == '-') {
			z = simple_strtoul(++str, &np, 0);
			if (str == np || a > z || z >= bits)
				return -EINVAL;
			str = np;
		}
		for (i = a; i <= z; i++)
			if (sign == '+')
				set_bit_inv(i, bitmap);
			else
				clear_bit_inv(i, bitmap);
		while (*str == ',' || *str == '\n')
			str++;
	}

	return 0;
}

int ap_parse_mask_str(const char *str,
		      unsigned long *bitmap, int bits,
		      struct mutex *lock)
{
	unsigned long *newmap, size;
	int rc;

	/* bits needs to be a multiple of 8 */
	if (bits & 0x07)
		return -EINVAL;

	size = BITS_TO_LONGS(bits)*sizeof(unsigned long);
	newmap = kmalloc(size, GFP_KERNEL);
	if (!newmap)
		return -ENOMEM;
	if (mutex_lock_interruptible(lock)) {
		kfree(newmap);
		return -ERESTARTSYS;
	}

	if (*str == '+' || *str == '-') {
		memcpy(newmap, bitmap, size);
		rc = modify_bitmap(str, newmap, bits);
	} else {
		memset(newmap, 0, size);
		rc = hex2bitmap(str, newmap, bits);
	}
	if (rc == 0)
		memcpy(bitmap, newmap, size);
	mutex_unlock(lock);
	kfree(newmap);
	return rc;
}
EXPORT_SYMBOL(ap_parse_mask_str);

/*
 * AP bus attributes.
 */

static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
}

static ssize_t ap_domain_store(struct bus_type *bus,
			       const char *buf, size_t count)
{
	int domain;

	if (sscanf(buf, "%i\n", &domain) != 1 ||
	    domain < 0 || domain > ap_max_domain_id ||
	    !test_bit_inv(domain, ap_perms.aqm))
		return -EINVAL;

	spin_lock_bh(&ap_domain_lock);
	ap_domain_index = domain;
	spin_unlock_bh(&ap_domain_lock);

	AP_DBF_INFO("stored new default domain=%d\n", domain);

	return count;
}

static BUS_ATTR_RW(ap_domain);

static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
{
	if (!ap_qci_info)	/* QCI not supported */
		return scnprintf(buf, PAGE_SIZE, "not supported\n");

	return scnprintf(buf, PAGE_SIZE,
			 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
			 ap_qci_info->adm[0], ap_qci_info->adm[1],
			 ap_qci_info->adm[2], ap_qci_info->adm[3],
			 ap_qci_info->adm[4], ap_qci_info->adm[5],
			 ap_qci_info->adm[6], ap_qci_info->adm[7]);
}

static BUS_ATTR_RO(ap_control_domain_mask);

static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
{
	if (!ap_qci_info)	/* QCI not supported */
		return scnprintf(buf, PAGE_SIZE, "not supported\n");

	return scnprintf(buf, PAGE_SIZE,
			 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
			 ap_qci_info->aqm[0], ap_qci_info->aqm[1],
			 ap_qci_info->aqm[2], ap_qci_info->aqm[3],
			 ap_qci_info->aqm[4], ap_qci_info->aqm[5],
			 ap_qci_info->aqm[6], ap_qci_info->aqm[7]);
}

static BUS_ATTR_RO(ap_usage_domain_mask);

static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf)
{
	if (!ap_qci_info)	/* QCI not supported */
		return scnprintf(buf, PAGE_SIZE, "not supported\n");

	return scnprintf(buf, PAGE_SIZE,
			 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
			 ap_qci_info->apm[0], ap_qci_info->apm[1],
			 ap_qci_info->apm[2], ap_qci_info->apm[3],
			 ap_qci_info->apm[4], ap_qci_info->apm[5],
			 ap_qci_info->apm[6], ap_qci_info->apm[7]);
}

static BUS_ATTR_RO(ap_adapter_mask);

static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%d\n",
			 ap_irq_flag ? 1 : 0);
}

static BUS_ATTR_RO(ap_interrupts);

static ssize_t config_time_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
}

static ssize_t config_time_store(struct bus_type *bus,
				 const char *buf, size_t count)
{
	int time;

	if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
		return -EINVAL;
	ap_config_time = time;
	mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
	return count;
}

static BUS_ATTR_RW(config_time);

static ssize_t poll_thread_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
}

static ssize_t poll_thread_store(struct bus_type *bus,
				 const char *buf, size_t count)
{
	int flag, rc;

	if (sscanf(buf, "%d\n", &flag) != 1)
		return -EINVAL;
	if (flag) {
		rc = ap_poll_thread_start();
		if (rc)
			count = rc;
	} else
		ap_poll_thread_stop();
	return count;
}

static BUS_ATTR_RW(poll_thread);

static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
}

static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
				  size_t count)
{
	unsigned long long time;
	ktime_t hr_time;

	/* 120 seconds = maximum poll interval */
	if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
	    time > 120000000000ULL)
		return -EINVAL;
	poll_timeout = time;
	hr_time = poll_timeout;

	spin_lock_bh(&ap_poll_timer_lock);
	hrtimer_cancel(&ap_poll_timer);
	hrtimer_set_expires(&ap_poll_timer, hr_time);
	hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
	spin_unlock_bh(&ap_poll_timer_lock);

	return count;
}

static BUS_ATTR_RW(poll_timeout);

static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_domain_id);
}

static BUS_ATTR_RO(ap_max_domain_id);

static ssize_t ap_max_adapter_id_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_adapter_id);
}

static BUS_ATTR_RO(ap_max_adapter_id);

static ssize_t apmask_show(struct bus_type *bus, char *buf)
{
	int rc;

	if (mutex_lock_interruptible(&ap_perms_mutex))
		return -ERESTARTSYS;
	rc = scnprintf(buf, PAGE_SIZE,
		       "0x%016lx%016lx%016lx%016lx\n",
		       ap_perms.apm[0], ap_perms.apm[1],
		       ap_perms.apm[2], ap_perms.apm[3]);
	mutex_unlock(&ap_perms_mutex);

	return rc;
}

static ssize_t apmask_store(struct bus_type *bus, const char *buf,
			    size_t count)
{
	int rc;

	rc = ap_parse_mask_str(buf, ap_perms.apm, AP_DEVICES, &ap_perms_mutex);
	if (rc)
		return rc;

	ap_bus_revise_bindings();

	return count;
}

static BUS_ATTR_RW(apmask);

static ssize_t aqmask_show(struct bus_type *bus, char *buf)
{
	int rc;

	if (mutex_lock_interruptible(&ap_perms_mutex))
		return -ERESTARTSYS;
	rc = scnprintf(buf, PAGE_SIZE,
		       "0x%016lx%016lx%016lx%016lx\n",
		       ap_perms.aqm[0], ap_perms.aqm[1],
		       ap_perms.aqm[2], ap_perms.aqm[3]);
	mutex_unlock(&ap_perms_mutex);

	return rc;
}

static ssize_t aqmask_store(struct bus_type *bus, const char *buf,
			    size_t count)
{
	int rc;

	rc = ap_parse_mask_str(buf, ap_perms.aqm, AP_DOMAINS, &ap_perms_mutex);
	if (rc)
		return rc;

	ap_bus_revise_bindings();

	return count;
}

static BUS_ATTR_RW(aqmask);

static ssize_t scans_show(struct bus_type *bus, char *buf)
{
	return scnprintf(buf, PAGE_SIZE, "%llu\n",
			 atomic64_read(&ap_scan_bus_count));
}

static BUS_ATTR_RO(scans);

static ssize_t bindings_show(struct bus_type *bus, char *buf)
{
	int rc;
	unsigned int apqns, n;

	ap_calc_bound_apqns(&apqns, &n);
	if (atomic64_read(&ap_scan_bus_count) >= 1 && n == apqns)
		rc = scnprintf(buf, PAGE_SIZE, "%u/%u (complete)\n", n, apqns);
	else
		rc = scnprintf(buf, PAGE_SIZE, "%u/%u\n", n, apqns);

	return rc;
}

static BUS_ATTR_RO(bindings);

static struct attribute *ap_bus_attrs[] = {
	&bus_attr_ap_domain.attr,
	&bus_attr_ap_control_domain_mask.attr,
	&bus_attr_ap_usage_domain_mask.attr,
	&bus_attr_ap_adapter_mask.attr,
	&bus_attr_config_time.attr,
	&bus_attr_poll_thread.attr,
	&bus_attr_ap_interrupts.attr,
	&bus_attr_poll_timeout.attr,
	&bus_attr_ap_max_domain_id.attr,
	&bus_attr_ap_max_adapter_id.attr,
	&bus_attr_apmask.attr,
	&bus_attr_aqmask.attr,
	&bus_attr_scans.attr,
	&bus_attr_bindings.attr,
	NULL,
};
ATTRIBUTE_GROUPS(ap_bus);

static struct bus_type ap_bus_type = {
	.name = "ap",
	.bus_groups = ap_bus_groups,
	.match = &ap_bus_match,
	.uevent = &ap_uevent,
	.probe = ap_device_probe,
	.remove = ap_device_remove,
};

/**
 * ap_select_domain(): Select an AP domain if possible and we haven't
 * already done so before.
 */
static void ap_select_domain(void)
{
	struct ap_queue_status status;
	int card, dom;

	/*
	 * Choose the default domain. Either the one specified with
	 * the "domain=" parameter or the first domain with at least
	 * one valid APQN.
	 */
	spin_lock_bh(&ap_domain_lock);
	if (ap_domain_index >= 0) {
		/* Domain has already been selected. */
		goto out;
	}
	for (dom = 0; dom <= ap_max_domain_id; dom++) {
		if (!ap_test_config_usage_domain(dom) ||
		    !test_bit_inv(dom, ap_perms.aqm))
			continue;
		for (card = 0; card <= ap_max_adapter_id; card++) {
			if (!ap_test_config_card_id(card) ||
			    !test_bit_inv(card, ap_perms.apm))
				continue;
			status = ap_test_queue(AP_MKQID(card, dom),
					       ap_apft_available(),
					       NULL);
			if (status.response_code == AP_RESPONSE_NORMAL)
				break;
		}
		if (card <= ap_max_adapter_id)
			break;
	}
	if (dom <= ap_max_domain_id) {
		ap_domain_index = dom;
		AP_DBF_INFO("%s new default domain is %d\n",
			    __func__, ap_domain_index);
	}
out:
	spin_unlock_bh(&ap_domain_lock);
}

/*
 * This function checks the type and returns either 0 for not
 * supported or the highest compatible type value (which may
 * include the input type value).
 */
static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func)
{
	int comp_type = 0;

	/* < CEX2A is not supported */
	if (rawtype < AP_DEVICE_TYPE_CEX2A) {
		AP_DBF_WARN("get_comp_type queue=%02x.%04x unsupported type %d\n",
			    AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype);
		return 0;
	}
	/* up to CEX7 known and fully supported */
	if (rawtype <= AP_DEVICE_TYPE_CEX7)
		return rawtype;
	/*
	 * unknown new type > CEX7, check for compatibility
	 * to the highest known and supported type which is
	 * currently CEX7 with the help of the QACT function.
	 */
	if (ap_qact_available()) {
		struct ap_queue_status status;
		union ap_qact_ap_info apinfo = {0};

		apinfo.mode = (func >> 26) & 0x07;
		apinfo.cat = AP_DEVICE_TYPE_CEX7;
		status = ap_qact(qid, 0, &apinfo);
		if (status.response_code == AP_RESPONSE_NORMAL
		    && apinfo.cat >= AP_DEVICE_TYPE_CEX2A
		    && apinfo.cat <= AP_DEVICE_TYPE_CEX7)
			comp_type = apinfo.cat;
	}
	if (!comp_type)
		AP_DBF_WARN("get_comp_type queue=%02x.%04x unable to map type %d\n",
			    AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype);
	else if (comp_type != rawtype)
		AP_DBF_INFO("get_comp_type queue=%02x.%04x map type %d to %d\n",
			    AP_QID_CARD(qid), AP_QID_QUEUE(qid),
			    rawtype, comp_type);
	return comp_type;
}

/*
 * Helper function to be used with bus_find_dev
 * matches for the card device with the given id
 */
static int __match_card_device_with_id(struct device *dev, const void *data)
{
	return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long)(void *) data;
}

/*
 * Helper function to be used with bus_find_dev
 * matches for the queue device with a given qid
 */
static int __match_queue_device_with_qid(struct device *dev, const void *data)
{
	return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data;
}

/*
 * Helper function to be used with bus_find_dev
 * matches any queue device with given queue id
 */
static int __match_queue_device_with_queue_id(struct device *dev, const void *data)
{
	return is_queue_dev(dev)
		&& AP_QID_QUEUE(to_ap_queue(dev)->qid) == (int)(long) data;
}

/*
 * Helper function for ap_scan_bus().
 * Remove card device and associated queue devices.
 */
static inline void ap_scan_rm_card_dev_and_queue_devs(struct ap_card *ac)
{
	bus_for_each_dev(&ap_bus_type, NULL,
			 (void *)(long) ac->id,
			 __ap_queue_devices_with_id_unregister);
	device_unregister(&ac->ap_dev.device);
}

/*
 * Helper function for ap_scan_bus().
 * Does the scan bus job for all the domains within
 * a valid adapter given by an ap_card ptr.
 */
static inline void ap_scan_domains(struct ap_card *ac)
{
	bool decfg;
	ap_qid_t qid;
	unsigned int func;
	struct device *dev;
	struct ap_queue *aq;
	int rc, dom, depth, type, ml;

	/*
	 * Go through the configuration for the domains and compare them
	 * to the existing queue devices. Also take care of the config
	 * and error state for the queue devices.
	 */

	for (dom = 0; dom <= ap_max_domain_id; dom++) {
		qid = AP_MKQID(ac->id, dom);
		dev = bus_find_device(&ap_bus_type, NULL,
				      (void *)(long) qid,
				      __match_queue_device_with_qid);
		aq = dev ? to_ap_queue(dev) : NULL;
		if (!ap_test_config_usage_domain(dom)) {
			if (dev) {
				AP_DBF_INFO("%s(%d,%d) not in config any more, rm queue device\n",
					    __func__, ac->id, dom);
				device_unregister(dev);
				put_device(dev);
			}
			continue;
		}
		/* domain is valid, get info from this APQN */
		if (!ap_queue_info(qid, &type, &func, &depth, &ml, &decfg)) {
			if (aq) {
				AP_DBF_INFO(
					"%s(%d,%d) ap_queue_info() not successful, rm queue device\n",
					__func__, ac->id, dom);
				device_unregister(dev);
				put_device(dev);
			}
			continue;
		}
		/* if no queue device exists, create a new one */
		if (!aq) {
			aq = ap_queue_create(qid, ac->ap_dev.device_type);
			if (!aq) {
				AP_DBF_WARN("%s(%d,%d) ap_queue_create() failed\n",
					    __func__, ac->id, dom);
				continue;
			}
			aq->card = ac;
			aq->config = !decfg;
			dev = &aq->ap_dev.device;
			dev->bus = &ap_bus_type;
			dev->parent = &ac->ap_dev.device;
			dev_set_name(dev, "%02x.%04x", ac->id, dom);
			/* register queue device */
			rc = device_register(dev);
			if (rc) {
				AP_DBF_WARN("%s(%d,%d) device_register() failed\n",
					    __func__, ac->id, dom);
				goto put_dev_and_continue;
			}
			/* get it and thus adjust reference counter */
			get_device(dev);
			if (decfg)
				AP_DBF_INFO("%s(%d,%d) new (decfg) queue device created\n",
					    __func__, ac->id, dom);
			else
				AP_DBF_INFO("%s(%d,%d) new queue device created\n",
					    __func__, ac->id, dom);
			goto put_dev_and_continue;
		}
		/* Check config state on the already existing queue device */
		spin_lock_bh(&aq->lock);
		if (decfg && aq->config) {
			/* config off this queue device */
			aq->config = false;
			if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
				aq->dev_state = AP_DEV_STATE_ERROR;
				aq->last_err_rc = AP_RESPONSE_DECONFIGURED;
			}
			spin_unlock_bh(&aq->lock);
			AP_DBF_INFO("%s(%d,%d) queue device config off\n",
				    __func__, ac->id, dom);
			ap_send_config_uevent(&aq->ap_dev, aq->config);
			/* 'receive' pending messages with -EAGAIN */
			ap_flush_queue(aq);
			goto put_dev_and_continue;
		}
		if (!decfg && !aq->config) {
			/* config on this queue device */
			aq->config = true;
			if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
				aq->dev_state = AP_DEV_STATE_OPERATING;
				aq->sm_state = AP_SM_STATE_RESET_START;
			}
			spin_unlock_bh(&aq->lock);
			AP_DBF_INFO("%s(%d,%d) queue device config on\n",
				    __func__, ac->id, dom);
			ap_send_config_uevent(&aq->ap_dev, aq->config);
			goto put_dev_and_continue;
		}
		/* handle other error states */
		if (!decfg && aq->dev_state == AP_DEV_STATE_ERROR) {
			spin_unlock_bh(&aq->lock);
			/* 'receive' pending messages with -EAGAIN */
			ap_flush_queue(aq);
			/* re-init (with reset) the queue device */
			ap_queue_init_state(aq);
			AP_DBF_INFO("%s(%d,%d) queue device reinit enforced\n",
				    __func__, ac->id, dom);
			goto put_dev_and_continue;
		}
		spin_unlock_bh(&aq->lock);
put_dev_and_continue:
		put_device(dev);
	}
}

/*
 * Helper function for ap_scan_bus().
 * Does the scan bus job for the given adapter id.
 */
static inline void ap_scan_adapter(int ap)
{
	bool decfg;
	ap_qid_t qid;
	unsigned int func;
	struct device *dev;
	struct ap_card *ac;
	int rc, dom, depth, type, comp_type, ml;

	/* Is there currently a card device for this adapter ? */
	dev = bus_find_device(&ap_bus_type, NULL,
			      (void *)(long) ap,
			      __match_card_device_with_id);
	ac = dev ? to_ap_card(dev) : NULL;

	/* Adapter not in configuration ? */
	if (!ap_test_config_card_id(ap)) {
		if (ac) {
			AP_DBF_INFO("%s(%d) ap not in config any more, rm card and queue devices\n",
				    __func__, ap);
			ap_scan_rm_card_dev_and_queue_devs(ac);
			put_device(dev);
		}
		return;
	}

	/*
	 * Adapter ap is valid in the current configuration. So do some checks:
	 * If no card device exists, build one. If a card device exists, check
	 * for type and functions changed. For all this we need to find a valid
	 * APQN first.
	 */

	for (dom = 0; dom <= ap_max_domain_id; dom++)
		if (ap_test_config_usage_domain(dom)) {
			qid = AP_MKQID(ap, dom);
			if (ap_queue_info(qid, &type, &func,
					  &depth, &ml, &decfg))
				break;
		}
	if (dom > ap_max_domain_id) {
		/* Could not find a valid APQN for this adapter */
		if (ac) {
			AP_DBF_INFO(
				"%s(%d) no type info (no APQN found), rm card and queue devices\n",
				__func__, ap);
			ap_scan_rm_card_dev_and_queue_devs(ac);
			put_device(dev);
		} else {
			AP_DBF_DBG("%s(%d) no type info (no APQN found), ignored\n",
				   __func__, ap);
		}
		return;
	}
	if (!type) {
		/* No apdater type info available, an unusable adapter */
		if (ac) {
			AP_DBF_INFO("%s(%d) no valid type (0) info, rm card and queue devices\n",
				    __func__, ap);
			ap_scan_rm_card_dev_and_queue_devs(ac);
			put_device(dev);
		} else {
			AP_DBF_DBG("%s(%d) no valid type (0) info, ignored\n",
				   __func__, ap);
		}
		return;
	}

	if (ac) {
		/* Check APQN against existing card device for changes */
		if (ac->raw_hwtype != type) {
			AP_DBF_INFO("%s(%d) hwtype %d changed, rm card and queue devices\n",
				    __func__, ap, type);
			ap_scan_rm_card_dev_and_queue_devs(ac);
			put_device(dev);
			ac = NULL;
		} else if (ac->functions != func) {
			AP_DBF_INFO("%s(%d) functions 0x%08x changed, rm card and queue devices\n",
				    __func__, ap, type);
			ap_scan_rm_card_dev_and_queue_devs(ac);
			put_device(dev);
			ac = NULL;
		} else {
			if (decfg && ac->config) {
				ac->config = false;
				AP_DBF_INFO("%s(%d) card device config off\n",
					    __func__, ap);
				ap_send_config_uevent(&ac->ap_dev, ac->config);
			}
			if (!decfg && !ac->config) {
				ac->config = true;
				AP_DBF_INFO("%s(%d) card device config on\n",
					    __func__, ap);
				ap_send_config_uevent(&ac->ap_dev, ac->config);
			}
		}
	}

	if (!ac) {
		/* Build a new card device */
		comp_type = ap_get_compatible_type(qid, type, func);
		if (!comp_type) {
			AP_DBF_WARN("%s(%d) type %d, can't get compatibility type\n",
				    __func__, ap, type);
			return;
		}
		ac = ap_card_create(ap, depth, type, comp_type, func, ml);
		if (!ac) {
			AP_DBF_WARN("%s(%d) ap_card_create() failed\n",
				    __func__, ap);
			return;
		}
		ac->config = !decfg;
		dev = &ac->ap_dev.device;
		dev->bus = &ap_bus_type;
		dev->parent = ap_root_device;
		dev_set_name(dev, "card%02x", ap);
		/* maybe enlarge ap_max_msg_size to support this card */
		if (ac->maxmsgsize > atomic_read(&ap_max_msg_size)) {
			atomic_set(&ap_max_msg_size, ac->maxmsgsize);
			AP_DBF_INFO("%s(%d) ap_max_msg_size update to %d byte\n",
				    __func__, ap, atomic_read(&ap_max_msg_size));
		}
		/* Register the new card device with AP bus */
		rc = device_register(dev);
		if (rc) {
			AP_DBF_WARN("%s(%d) device_register() failed\n",
				    __func__, ap);
			put_device(dev);
			return;
		}
		/* get it and thus adjust reference counter */
		get_device(dev);
		if (decfg)
			AP_DBF_INFO("%s(%d) new (decfg) card device type=%d func=0x%08x created\n",
				    __func__, ap, type, func);
		else
			AP_DBF_INFO("%s(%d) new card device type=%d func=0x%08x created\n",
				    __func__, ap, type, func);
	}

	/* Verify the domains and the queue devices for this card */
	ap_scan_domains(ac);

	/* release the card device */
	put_device(&ac->ap_dev.device);
}

/**
 * ap_scan_bus(): Scan the AP bus for new devices
 * Runs periodically, workqueue timer (ap_config_time)
 */
static void ap_scan_bus(struct work_struct *unused)
{
	int ap;

	ap_fetch_qci_info(ap_qci_info);
	ap_select_domain();

	AP_DBF_DBG("%s running\n", __func__);

	/* loop over all possible adapters */
	for (ap = 0; ap <= ap_max_adapter_id; ap++)
		ap_scan_adapter(ap);

	/* check if there is at least one queue available with default domain */
	if (ap_domain_index >= 0) {
		struct device *dev =
			bus_find_device(&ap_bus_type, NULL,
					(void *)(long) ap_domain_index,
					__match_queue_device_with_queue_id);
		if (dev)
			put_device(dev);
		else
			AP_DBF_INFO("no queue device with default domain %d available\n",
				    ap_domain_index);
	}

	if (atomic64_inc_return(&ap_scan_bus_count) == 1) {
		AP_DBF(DBF_DEBUG, "%s init scan complete\n", __func__);
		ap_send_init_scan_done_uevent();
		ap_check_bindings_complete();
	}

	mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
}

static void ap_config_timeout(struct timer_list *unused)
{
	queue_work(system_long_wq, &ap_scan_work);
}

static int __init ap_debug_init(void)
{
	ap_dbf_info = debug_register("ap", 1, 1,
				     DBF_MAX_SPRINTF_ARGS * sizeof(long));
	debug_register_view(ap_dbf_info, &debug_sprintf_view);
	debug_set_level(ap_dbf_info, DBF_ERR);

	return 0;
}

static void __init ap_perms_init(void)
{
	/* all resources useable if no kernel parameter string given */
	memset(&ap_perms.ioctlm, 0xFF, sizeof(ap_perms.ioctlm));
	memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm));
	memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm));

	/* apm kernel parameter string */
	if (apm_str) {
		memset(&ap_perms.apm, 0, sizeof(ap_perms.apm));
		ap_parse_mask_str(apm_str, ap_perms.apm, AP_DEVICES,
				  &ap_perms_mutex);
	}

	/* aqm kernel parameter string */
	if (aqm_str) {
		memset(&ap_perms.aqm, 0, sizeof(ap_perms.aqm));
		ap_parse_mask_str(aqm_str, ap_perms.aqm, AP_DOMAINS,
				  &ap_perms_mutex);
	}
}

/**
 * ap_module_init(): The module initialization code.
 *
 * Initializes the module.
 */
static int __init ap_module_init(void)
{
	int rc;

	rc = ap_debug_init();
	if (rc)
		return rc;

	if (!ap_instructions_available()) {
		pr_warn("The hardware system does not support AP instructions\n");
		return -ENODEV;
	}

	/* init ap_queue hashtable */
	hash_init(ap_queues);

	/* set up the AP permissions (ioctls, ap and aq masks) */
	ap_perms_init();

	/* Get AP configuration data if available */
	ap_init_qci_info();

	/* check default domain setting */
	if (ap_domain_index < -1 || ap_domain_index > ap_max_domain_id ||
	    (ap_domain_index >= 0 &&
	     !test_bit_inv(ap_domain_index, ap_perms.aqm))) {
		pr_warn("%d is not a valid cryptographic domain\n",
			ap_domain_index);
		ap_domain_index = -1;
	}

	/* enable interrupts if available */
	if (ap_interrupts_available()) {
		rc = register_adapter_interrupt(&ap_airq);
		ap_irq_flag = (rc == 0);
	}

	/* Create /sys/bus/ap. */
	rc = bus_register(&ap_bus_type);
	if (rc)
		goto out;

	/* Create /sys/devices/ap. */
	ap_root_device = root_device_register("ap");
	rc = PTR_ERR_OR_ZERO(ap_root_device);
	if (rc)
		goto out_bus;
	ap_root_device->bus = &ap_bus_type;

	/* Setup the AP bus rescan timer. */
	timer_setup(&ap_config_timer, ap_config_timeout, 0);

	/*
	 * Setup the high resultion poll timer.
	 * If we are running under z/VM adjust polling to z/VM polling rate.
	 */
	if (MACHINE_IS_VM)
		poll_timeout = 1500000;
	hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
	ap_poll_timer.function = ap_poll_timeout;

	/* Start the low priority AP bus poll thread. */
	if (ap_thread_flag) {
		rc = ap_poll_thread_start();
		if (rc)
			goto out_work;
	}

	queue_work(system_long_wq, &ap_scan_work);

	return 0;

out_work:
	hrtimer_cancel(&ap_poll_timer);
	root_device_unregister(ap_root_device);
out_bus:
	bus_unregister(&ap_bus_type);
out:
	if (ap_irq_flag)
		unregister_adapter_interrupt(&ap_airq);
	kfree(ap_qci_info);
	return rc;
}
device_initcall(ap_module_init);