summaryrefslogtreecommitdiffstats
path: root/drivers/ieee1394/nodemgr.c
blob: 90dc75be3418c91f0baab414181577f62ded696f (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
/*
 * Node information (ConfigROM) collection and management.
 *
 * Copyright (C) 2000		Andreas E. Bombe
 *               2001-2003	Ben Collins <bcollins@debian.net>
 *
 * This code is licensed under the GPL.  See the file COPYING in the root
 * directory of the kernel sources for details.
 */

#include <linux/bitmap.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/freezer.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>

#include "csr.h"
#include "highlevel.h"
#include "hosts.h"
#include "ieee1394.h"
#include "ieee1394_core.h"
#include "ieee1394_hotplug.h"
#include "ieee1394_types.h"
#include "ieee1394_transactions.h"
#include "nodemgr.h"

static int ignore_drivers;
module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");

struct nodemgr_csr_info {
	struct hpsb_host *host;
	nodeid_t nodeid;
	unsigned int generation;
	unsigned int speed_unverified:1;
};


/*
 * Correct the speed map entry.  This is necessary
 *  - for nodes with link speed < phy speed,
 *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
 * A possible speed is determined by trial and error, using quadlet reads.
 */
static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
			       quadlet_t *buffer)
{
	quadlet_t q;
	u8 i, *speed, old_speed, good_speed;
	int error;

	speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
	old_speed = *speed;
	good_speed = IEEE1394_SPEED_MAX + 1;

	/* Try every speed from S100 to old_speed.
	 * If we did it the other way around, a too low speed could be caught
	 * if the retry succeeded for some other reason, e.g. because the link
	 * just finished its initialization. */
	for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
		*speed = i;
		error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
				  &q, sizeof(quadlet_t));
		if (error)
			break;
		*buffer = q;
		good_speed = i;
	}
	if (good_speed <= IEEE1394_SPEED_MAX) {
		HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
			   NODE_BUS_ARGS(ci->host, ci->nodeid),
			   hpsb_speedto_str[good_speed]);
		*speed = good_speed;
		ci->speed_unverified = 0;
		return 0;
	}
	*speed = old_speed;
	return error;
}

static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
			    void *buffer, void *__ci)
{
	struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
	int i, error;

	for (i = 1; ; i++) {
		error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
				  buffer, length);
		if (!error) {
			ci->speed_unverified = 0;
			break;
		}
		/* Give up after 3rd failure. */
		if (i == 3)
			break;

		/* The ieee1394_core guessed the node's speed capability from
		 * the self ID.  Check whether a lower speed works. */
		if (ci->speed_unverified && length == sizeof(quadlet_t)) {
			error = nodemgr_check_speed(ci, addr, buffer);
			if (!error)
				break;
		}
		if (msleep_interruptible(334))
			return -EINTR;
	}
	return error;
}

static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
{
	return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
}

static struct csr1212_bus_ops nodemgr_csr_ops = {
	.bus_read =	nodemgr_bus_read,
	.get_max_rom =	nodemgr_get_max_rom
};


/*
 * Basically what we do here is start off retrieving the bus_info block.
 * From there will fill in some info about the node, verify it is of IEEE
 * 1394 type, and that the crc checks out ok. After that we start off with
 * the root directory, and subdirectories. To do this, we retrieve the
 * quadlet header for a directory, find out the length, and retrieve the
 * complete directory entry (be it a leaf or a directory). We then process
 * it and add the info to our structure for that particular node.
 *
 * We verify CRC's along the way for each directory/block/leaf. The entire
 * node structure is generic, and simply stores the information in a way
 * that's easy to parse by the protocol interface.
 */

/*
 * The nodemgr relies heavily on the Driver Model for device callbacks and
 * driver/device mappings. The old nodemgr used to handle all this itself,
 * but now we are much simpler because of the LDM.
 */

struct host_info {
	struct hpsb_host *host;
	struct list_head list;
	struct task_struct *thread;
};

static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env);
static void nodemgr_resume_ne(struct node_entry *ne);
static void nodemgr_remove_ne(struct node_entry *ne);
static struct node_entry *find_entry_by_guid(u64 guid);

struct bus_type ieee1394_bus_type = {
	.name		= "ieee1394",
	.match		= nodemgr_bus_match,
};

static void host_cls_release(struct device *dev)
{
	put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
}

struct class hpsb_host_class = {
	.name		= "ieee1394_host",
	.dev_release	= host_cls_release,
};

static void ne_cls_release(struct device *dev)
{
	put_device(&container_of((dev), struct node_entry, node_dev)->device);
}

static struct class nodemgr_ne_class = {
	.name		= "ieee1394_node",
	.dev_release	= ne_cls_release,
};

static void ud_cls_release(struct device *dev)
{
	put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
}

/* The name here is only so that unit directory hotplug works with old
 * style hotplug, which only ever did unit directories anyway.
 */
static struct class nodemgr_ud_class = {
	.name		= "ieee1394",
	.dev_release	= ud_cls_release,
	.dev_uevent	= nodemgr_uevent,
};

static struct hpsb_highlevel nodemgr_highlevel;


static void nodemgr_release_ud(struct device *dev)
{
	struct unit_directory *ud = container_of(dev, struct unit_directory, device);

	if (ud->vendor_name_kv)
		csr1212_release_keyval(ud->vendor_name_kv);
	if (ud->model_name_kv)
		csr1212_release_keyval(ud->model_name_kv);

	kfree(ud);
}

static void nodemgr_release_ne(struct device *dev)
{
	struct node_entry *ne = container_of(dev, struct node_entry, device);

	if (ne->vendor_name_kv)
		csr1212_release_keyval(ne->vendor_name_kv);

	kfree(ne);
}


static void nodemgr_release_host(struct device *dev)
{
	struct hpsb_host *host = container_of(dev, struct hpsb_host, device);

	csr1212_destroy_csr(host->csr.rom);

	kfree(host);
}

static int nodemgr_ud_platform_data;

static struct device nodemgr_dev_template_ud = {
	.bus		= &ieee1394_bus_type,
	.release	= nodemgr_release_ud,
	.platform_data	= &nodemgr_ud_platform_data,
};

static struct device nodemgr_dev_template_ne = {
	.bus		= &ieee1394_bus_type,
	.release	= nodemgr_release_ne,
};

/* This dummy driver prevents the host devices from being scanned. We have no
 * useful drivers for them yet, and there would be a deadlock possible if the
 * driver core scans the host device while the host's low-level driver (i.e.
 * the host's parent device) is being removed. */
static struct device_driver nodemgr_mid_layer_driver = {
	.bus		= &ieee1394_bus_type,
	.name		= "nodemgr",
	.owner		= THIS_MODULE,
};

struct device nodemgr_dev_template_host = {
	.bus		= &ieee1394_bus_type,
	.release	= nodemgr_release_host,
};


#define fw_attr(class, class_type, field, type, format_string)		\
static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
{									\
	class_type *class;						\
	class = container_of(dev, class_type, device);			\
	return sprintf(buf, format_string, (type)class->field);		\
}									\
static struct device_attribute dev_attr_##class##_##field = {		\
	.attr = {.name = __stringify(field), .mode = S_IRUGO },		\
	.show   = fw_show_##class##_##field,				\
};

#define fw_attr_td(class, class_type, td_kv)				\
static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
{									\
	int len;							\
	class_type *class = container_of(dev, class_type, device);	\
	len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);	\
	memcpy(buf,							\
	       CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),	\
	       len);							\
	while (buf[len - 1] == '\0')					\
		len--;							\
	buf[len++] = '\n';						\
	buf[len] = '\0';						\
	return len;							\
}									\
static struct device_attribute dev_attr_##class##_##td_kv = {		\
	.attr = {.name = __stringify(td_kv), .mode = S_IRUGO },		\
	.show   = fw_show_##class##_##td_kv,				\
};


#define fw_drv_attr(field, type, format_string)			\
static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
{								\
	struct hpsb_protocol_driver *driver;			\
	driver = container_of(drv, struct hpsb_protocol_driver, driver); \
	return sprintf(buf, format_string, (type)driver->field);\
}								\
static struct driver_attribute driver_attr_drv_##field = {	\
	.attr = {.name = __stringify(field), .mode = S_IRUGO },	\
	.show   = fw_drv_show_##field,				\
};


static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct node_entry *ne = container_of(dev, struct node_entry, device);

	return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
		       "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
		       ne->busopt.irmc,
		       ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
		       ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
		       ne->busopt.max_rec,
		       ne->busopt.max_rom,
		       ne->busopt.cyc_clk_acc);
}
static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);


#ifdef HPSB_DEBUG_TLABELS
static ssize_t fw_show_ne_tlabels_free(struct device *dev,
				       struct device_attribute *attr, char *buf)
{
	struct node_entry *ne = container_of(dev, struct node_entry, device);
	unsigned long flags;
	unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
	int tf;

	spin_lock_irqsave(&hpsb_tlabel_lock, flags);
	tf = 64 - bitmap_weight(tp, 64);
	spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);

	return sprintf(buf, "%d\n", tf);
}
static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);


static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
				       struct device_attribute *attr, char *buf)
{
	struct node_entry *ne = container_of(dev, struct node_entry, device);
	unsigned long flags;
	unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
	u64 tm;

	spin_lock_irqsave(&hpsb_tlabel_lock, flags);
#if (BITS_PER_LONG <= 32)
	tm = ((u64)tp[0] << 32) + tp[1];
#else
	tm = tp[0];
#endif
	spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);

	return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
}
static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
#endif /* HPSB_DEBUG_TLABELS */


static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct unit_directory *ud = container_of(dev, struct unit_directory, device);
	int state = simple_strtoul(buf, NULL, 10);

	if (state == 1) {
		ud->ignore_driver = 1;
		device_release_driver(dev);
	} else if (state == 0)
		ud->ignore_driver = 0;

	return count;
}
static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct unit_directory *ud = container_of(dev, struct unit_directory, device);

	return sprintf(buf, "%d\n", ud->ignore_driver);
}
static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);


static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
{
	struct node_entry *ne;
	u64 guid = (u64)simple_strtoull(buf, NULL, 16);

	ne = find_entry_by_guid(guid);

	if (ne == NULL || !ne->in_limbo)
		return -EINVAL;

	nodemgr_remove_ne(ne);

	return count;
}
static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
{
	return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
}
static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);


static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
			     size_t count)
{
	int error = 0;

	if (simple_strtoul(buf, NULL, 10) == 1)
		error = bus_rescan_devices(&ieee1394_bus_type);
	return error ? error : count;
}
static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
{
	return sprintf(buf, "You can force a rescan of the bus for "
			"drivers by writing a 1 to this file\n");
}
static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);


static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
{
	int state = simple_strtoul(buf, NULL, 10);

	if (state == 1)
		ignore_drivers = 1;
	else if (state == 0)
		ignore_drivers = 0;

	return count;
}
static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
{
	return sprintf(buf, "%d\n", ignore_drivers);
}
static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);


struct bus_attribute *const fw_bus_attrs[] = {
	&bus_attr_destroy_node,
	&bus_attr_rescan,
	&bus_attr_ignore_drivers,
	NULL
};


fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")

fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
fw_attr_td(ne, struct node_entry, vendor_name_kv)

fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");

static struct device_attribute *const fw_ne_attrs[] = {
	&dev_attr_ne_guid,
	&dev_attr_ne_guid_vendor_id,
	&dev_attr_ne_capabilities,
	&dev_attr_ne_vendor_id,
	&dev_attr_ne_nodeid,
	&dev_attr_bus_options,
#ifdef HPSB_DEBUG_TLABELS
	&dev_attr_tlabels_free,
	&dev_attr_tlabels_mask,
#endif
};



fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
fw_attr(ud, struct unit_directory, length, int, "%d\n")
/* These are all dependent on the value being provided */
fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
fw_attr_td(ud, struct unit_directory, vendor_name_kv)
fw_attr_td(ud, struct unit_directory, model_name_kv)

static struct device_attribute *const fw_ud_attrs[] = {
	&dev_attr_ud_address,
	&dev_attr_ud_length,
	&dev_attr_ignore_driver,
};


fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")

static struct device_attribute *const fw_host_attrs[] = {
	&dev_attr_host_node_count,
	&dev_attr_host_selfid_count,
	&dev_attr_host_nodes_active,
	&dev_attr_host_in_bus_reset,
	&dev_attr_host_is_root,
	&dev_attr_host_is_cycmst,
	&dev_attr_host_is_irm,
	&dev_attr_host_is_busmgr,
};


static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
{
	struct hpsb_protocol_driver *driver;
	struct ieee1394_device_id *id;
	int length = 0;
	char *scratch = buf;

	driver = container_of(drv, struct hpsb_protocol_driver, driver);

	for (id = driver->id_table; id->match_flags != 0; id++) {
		int need_coma = 0;

		if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
			length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
			scratch = buf + length;
			need_coma++;
		}

		if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
			length += sprintf(scratch, "%smodel_id=0x%06x",
					  need_coma++ ? "," : "",
					  id->model_id);
			scratch = buf + length;
		}

		if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
			length += sprintf(scratch, "%sspecifier_id=0x%06x",
					  need_coma++ ? "," : "",
					  id->specifier_id);
			scratch = buf + length;
		}

		if (id->match_flags & IEEE1394_MATCH_VERSION) {
			length += sprintf(scratch, "%sversion=0x%06x",
					  need_coma++ ? "," : "",
					  id->version);
			scratch = buf + length;
		}

		if (need_coma) {
			*scratch++ = '\n';
			length++;
		}
	}

	return length;
}
static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);


fw_drv_attr(name, const char *, "%s\n")

static struct driver_attribute *const fw_drv_attrs[] = {
	&driver_attr_drv_name,
	&driver_attr_device_ids,
};


static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
{
	struct device_driver *drv = &driver->driver;
	int i;

	for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
		if (driver_create_file(drv, fw_drv_attrs[i]))
			goto fail;
	return;
fail:
	HPSB_ERR("Failed to add sysfs attribute");
}


static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
{
	struct device_driver *drv = &driver->driver;
	int i;

	for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
		driver_remove_file(drv, fw_drv_attrs[i]);
}


static void nodemgr_create_ne_dev_files(struct node_entry *ne)
{
	struct device *dev = &ne->device;
	int i;

	for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
		if (device_create_file(dev, fw_ne_attrs[i]))
			goto fail;
	return;
fail:
	HPSB_ERR("Failed to add sysfs attribute");
}


static void nodemgr_create_host_dev_files(struct hpsb_host *host)
{
	struct device *dev = &host->device;
	int i;

	for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
		if (device_create_file(dev, fw_host_attrs[i]))
			goto fail;
	return;
fail:
	HPSB_ERR("Failed to add sysfs attribute");
}


static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
					       nodeid_t nodeid);

static void nodemgr_update_host_dev_links(struct hpsb_host *host)
{
	struct device *dev = &host->device;
	struct node_entry *ne;

	sysfs_remove_link(&dev->kobj, "irm_id");
	sysfs_remove_link(&dev->kobj, "busmgr_id");
	sysfs_remove_link(&dev->kobj, "host_id");

	if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
	    sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
		goto fail;
	if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
	    sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
		goto fail;
	if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
	    sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
		goto fail;
	return;
fail:
	HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
}

static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
{
	struct device *dev = &ud->device;
	int i;

	for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
		if (device_create_file(dev, fw_ud_attrs[i]))
			goto fail;
	if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
		if (device_create_file(dev, &dev_attr_ud_specifier_id))
			goto fail;
	if (ud->flags & UNIT_DIRECTORY_VERSION)
		if (device_create_file(dev, &dev_attr_ud_version))
			goto fail;
	if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
		if (device_create_file(dev, &dev_attr_ud_vendor_id))
			goto fail;
		if (ud->vendor_name_kv &&
		    device_create_file(dev, &dev_attr_ud_vendor_name_kv))
			goto fail;
	}
	if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
		if (device_create_file(dev, &dev_attr_ud_model_id))
			goto fail;
		if (ud->model_name_kv &&
		    device_create_file(dev, &dev_attr_ud_model_name_kv))
			goto fail;
	}
	return;
fail:
	HPSB_ERR("Failed to add sysfs attribute");
}


static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
{
	struct hpsb_protocol_driver *driver;
	struct unit_directory *ud;
	struct ieee1394_device_id *id;

	/* We only match unit directories */
	if (dev->platform_data != &nodemgr_ud_platform_data)
		return 0;

	ud = container_of(dev, struct unit_directory, device);
	if (ud->ne->in_limbo || ud->ignore_driver)
		return 0;

	/* We only match drivers of type hpsb_protocol_driver */
	if (drv == &nodemgr_mid_layer_driver)
		return 0;

	driver = container_of(drv, struct hpsb_protocol_driver, driver);
	for (id = driver->id_table; id->match_flags != 0; id++) {
		if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
		    id->vendor_id != ud->vendor_id)
			continue;

		if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
		    id->model_id != ud->model_id)
			continue;

		if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
		    id->specifier_id != ud->specifier_id)
			continue;

		if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
		    id->version != ud->version)
			continue;

		return 1;
	}

	return 0;
}


static DEFINE_MUTEX(nodemgr_serialize_remove_uds);

static void nodemgr_remove_uds(struct node_entry *ne)
{
	struct device *dev;
	struct unit_directory *tmp, *ud;

	/* Iteration over nodemgr_ud_class.devices has to be protected by
	 * nodemgr_ud_class.sem, but device_unregister() will eventually
	 * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
	 * release the semaphore, and then unregister the ud. Since this code
	 * may be called from other contexts besides the knodemgrds, protect the
	 * gap after release of the semaphore by nodemgr_serialize_remove_uds.
	 */
	mutex_lock(&nodemgr_serialize_remove_uds);
	for (;;) {
		ud = NULL;
		down(&nodemgr_ud_class.sem);
		list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
			tmp = container_of(dev, struct unit_directory,
					   unit_dev);
			if (tmp->ne == ne) {
				ud = tmp;
				break;
			}
		}
		up(&nodemgr_ud_class.sem);
		if (ud == NULL)
			break;
		device_unregister(&ud->unit_dev);
		device_unregister(&ud->device);
	}
	mutex_unlock(&nodemgr_serialize_remove_uds);
}


static void nodemgr_remove_ne(struct node_entry *ne)
{
	struct device *dev;

	dev = get_device(&ne->device);
	if (!dev)
		return;

	HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
		   NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
	nodemgr_remove_uds(ne);

	device_unregister(&ne->node_dev);
	device_unregister(dev);

	put_device(dev);
}

static int __nodemgr_remove_host_dev(struct device *dev, void *data)
{
	if (dev->bus == &ieee1394_bus_type)
		nodemgr_remove_ne(container_of(dev, struct node_entry,
				  device));
	return 0;
}

static void nodemgr_remove_host_dev(struct device *dev)
{
	WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
	sysfs_remove_link(&dev->kobj, "irm_id");
	sysfs_remove_link(&dev->kobj, "busmgr_id");
	sysfs_remove_link(&dev->kobj, "host_id");
}


static void nodemgr_update_bus_options(struct node_entry *ne)
{
#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
	static const u16 mr[] = { 4, 64, 1024, 0};
#endif
	quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);

	ne->busopt.irmc		= (busoptions >> 31) & 1;
	ne->busopt.cmc		= (busoptions >> 30) & 1;
	ne->busopt.isc		= (busoptions >> 29) & 1;
	ne->busopt.bmc		= (busoptions >> 28) & 1;
	ne->busopt.pmc		= (busoptions >> 27) & 1;
	ne->busopt.cyc_clk_acc	= (busoptions >> 16) & 0xff;
	ne->busopt.max_rec	= 1 << (((busoptions >> 12) & 0xf) + 1);
	ne->busopt.max_rom	= (busoptions >> 8) & 0x3;
	ne->busopt.generation	= (busoptions >> 4) & 0xf;
	ne->busopt.lnkspd	= busoptions & 0x7;

	HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
		     "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
		     busoptions, ne->busopt.irmc, ne->busopt.cmc,
		     ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
		     ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
		     mr[ne->busopt.max_rom],
		     ne->busopt.generation, ne->busopt.lnkspd);
}


static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
					      struct host_info *hi, nodeid_t nodeid,
					      unsigned int generation)
{
	struct hpsb_host *host = hi->host;
	struct node_entry *ne;

	ne = kzalloc(sizeof(*ne), GFP_KERNEL);
	if (!ne)
		goto fail_alloc;

	ne->host = host;
	ne->nodeid = nodeid;
	ne->generation = generation;
	ne->needs_probe = 1;

	ne->guid = guid;
	ne->guid_vendor_id = (guid >> 40) & 0xffffff;
	ne->csr = csr;

	memcpy(&ne->device, &nodemgr_dev_template_ne,
	       sizeof(ne->device));
	ne->device.parent = &host->device;
	snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
		 (unsigned long long)(ne->guid));

	ne->node_dev.parent = &ne->device;
	ne->node_dev.class = &nodemgr_ne_class;
	snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
		(unsigned long long)(ne->guid));

	if (device_register(&ne->device))
		goto fail_devreg;
	if (device_register(&ne->node_dev))
		goto fail_classdevreg;
	get_device(&ne->device);

	nodemgr_create_ne_dev_files(ne);

	nodemgr_update_bus_options(ne);

	HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
		   (host->node_id == nodeid) ? "Host" : "Node",
		   NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);

	return ne;

fail_classdevreg:
	device_unregister(&ne->device);
fail_devreg:
	kfree(ne);
fail_alloc:
	HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
		 NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);

	return NULL;
}


static struct node_entry *find_entry_by_guid(u64 guid)
{
	struct device *dev;
	struct node_entry *ne, *ret_ne = NULL;

	down(&nodemgr_ne_class.sem);
	list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
		ne = container_of(dev, struct node_entry, node_dev);

		if (ne->guid == guid) {
			ret_ne = ne;
			break;
		}
	}
	up(&nodemgr_ne_class.sem);

	return ret_ne;
}


static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
					       nodeid_t nodeid)
{
	struct device *dev;
	struct node_entry *ne, *ret_ne = NULL;

	down(&nodemgr_ne_class.sem);
	list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
		ne = container_of(dev, struct node_entry, node_dev);

		if (ne->host == host && ne->nodeid == nodeid) {
			ret_ne = ne;
			break;
		}
	}
	up(&nodemgr_ne_class.sem);

	return ret_ne;
}


static void nodemgr_register_device(struct node_entry *ne, 
	struct unit_directory *ud, struct device *parent)
{
	memcpy(&ud->device, &nodemgr_dev_template_ud,
	       sizeof(ud->device));

	ud->device.parent = parent;

	snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
		 ne->device.bus_id, ud->id);

	ud->unit_dev.parent = &ud->device;
	ud->unit_dev.class = &nodemgr_ud_class;
	snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
		 ne->device.bus_id, ud->id);

	if (device_register(&ud->device))
		goto fail_devreg;
	if (device_register(&ud->unit_dev))
		goto fail_classdevreg;
	get_device(&ud->device);

	nodemgr_create_ud_dev_files(ud);

	return;

fail_classdevreg:
	device_unregister(&ud->device);
fail_devreg:
	HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
}	


/* This implementation currently only scans the config rom and its
 * immediate unit directories looking for software_id and
 * software_version entries, in order to get driver autoloading working. */
static struct unit_directory *nodemgr_process_unit_directory
	(struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
	 unsigned int *id, struct unit_directory *parent)
{
	struct unit_directory *ud;
	struct unit_directory *ud_child = NULL;
	struct csr1212_dentry *dentry;
	struct csr1212_keyval *kv;
	u8 last_key_id = 0;

	ud = kzalloc(sizeof(*ud), GFP_KERNEL);
	if (!ud)
		goto unit_directory_error;

	ud->ne = ne;
	ud->ignore_driver = ignore_drivers;
	ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
	ud->directory_id = ud->address & 0xffffff;
	ud->ud_kv = ud_kv;
	ud->id = (*id)++;

	csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
		switch (kv->key.id) {
		case CSR1212_KV_ID_VENDOR:
			if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
				ud->vendor_id = kv->value.immediate;
				ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
			}
			break;

		case CSR1212_KV_ID_MODEL:
			ud->model_id = kv->value.immediate;
			ud->flags |= UNIT_DIRECTORY_MODEL_ID;
			break;

		case CSR1212_KV_ID_SPECIFIER_ID:
			ud->specifier_id = kv->value.immediate;
			ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
			break;

		case CSR1212_KV_ID_VERSION:
			ud->version = kv->value.immediate;
			ud->flags |= UNIT_DIRECTORY_VERSION;
			break;

		case CSR1212_KV_ID_DESCRIPTOR:
			if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
			    CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
			    CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
			    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
			    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
			    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
				switch (last_key_id) {
				case CSR1212_KV_ID_VENDOR:
					csr1212_keep_keyval(kv);
					ud->vendor_name_kv = kv;
					break;

				case CSR1212_KV_ID_MODEL:
					csr1212_keep_keyval(kv);
					ud->model_name_kv = kv;
					break;

				}
			} /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
			break;

		case CSR1212_KV_ID_DEPENDENT_INFO:
			/* Logical Unit Number */
			if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
				if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
					ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
					if (!ud_child)
						goto unit_directory_error;
					nodemgr_register_device(ne, ud_child, &ne->device);
					ud_child = NULL;
					
					ud->id = (*id)++;
				}
				ud->lun = kv->value.immediate;
				ud->flags |= UNIT_DIRECTORY_HAS_LUN;

			/* Logical Unit Directory */
			} else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
				/* This should really be done in SBP2 as this is
				 * doing SBP2 specific parsing.
				 */
				
				/* first register the parent unit */
				ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
				if (ud->device.bus != &ieee1394_bus_type)
					nodemgr_register_device(ne, ud, &ne->device);
				
				/* process the child unit */
				ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);

				if (ud_child == NULL)
					break;
				
				/* inherit unspecified values, the driver core picks it up */
				if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
				    !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
				{
					ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
					ud_child->model_id = ud->model_id;
				}
				if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
				    !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
				{
					ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
					ud_child->specifier_id = ud->specifier_id;
				}
				if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
				    !(ud_child->flags & UNIT_DIRECTORY_VERSION))
				{
					ud_child->flags |=  UNIT_DIRECTORY_VERSION;
					ud_child->version = ud->version;
				}
				
				/* register the child unit */
				ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
				nodemgr_register_device(ne, ud_child, &ud->device);
			}

			break;

		case CSR1212_KV_ID_DIRECTORY_ID:
			ud->directory_id = kv->value.immediate;
			break;

		default:
			break;
		}
		last_key_id = kv->key.id;
	}
	
	/* do not process child units here and only if not already registered */
	if (!parent && ud->device.bus != &ieee1394_bus_type)
		nodemgr_register_device(ne, ud, &ne->device);

	return ud;

unit_directory_error:
	kfree(ud);
	return NULL;
}


static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
{
	unsigned int ud_id = 0;
	struct csr1212_dentry *dentry;
	struct csr1212_keyval *kv, *vendor_name_kv = NULL;
	u8 last_key_id = 0;

	ne->needs_probe = 0;

	csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
		switch (kv->key.id) {
		case CSR1212_KV_ID_VENDOR:
			ne->vendor_id = kv->value.immediate;
			break;

		case CSR1212_KV_ID_NODE_CAPABILITIES:
			ne->capabilities = kv->value.immediate;
			break;

		case CSR1212_KV_ID_UNIT:
			nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
			break;

		case CSR1212_KV_ID_DESCRIPTOR:
			if (last_key_id == CSR1212_KV_ID_VENDOR) {
				if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
				    CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
				    CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
				    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
				    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
				    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
					csr1212_keep_keyval(kv);
					vendor_name_kv = kv;
				}
			}
			break;
		}
		last_key_id = kv->key.id;
	}

	if (ne->vendor_name_kv) {
		kv = ne->vendor_name_kv;
		ne->vendor_name_kv = vendor_name_kv;
		csr1212_release_keyval(kv);
	} else if (vendor_name_kv) {
		ne->vendor_name_kv = vendor_name_kv;
		if (device_create_file(&ne->device,
				       &dev_attr_ne_vendor_name_kv) != 0)
			HPSB_ERR("Failed to add sysfs attribute");
	}
}

#ifdef CONFIG_HOTPLUG

static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct unit_directory *ud;
	int retval = 0;
	/* ieee1394:venNmoNspNverN */
	char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];

	if (!dev)
		return -ENODEV;

	ud = container_of(dev, struct unit_directory, unit_dev);

	if (ud->ne->in_limbo || ud->ignore_driver)
		return -ENODEV;

#define PUT_ENVP(fmt,val) 					\
do {								\
	retval = add_uevent_var(env, fmt, val);		\
	if (retval)						\
		return retval;					\
} while (0)

	PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
	PUT_ENVP("MODEL_ID=%06x", ud->model_id);
	PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
	PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
	PUT_ENVP("VERSION=%06x", ud->version);
	snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
			ud->vendor_id,
			ud->model_id,
			ud->specifier_id,
			ud->version);
	PUT_ENVP("MODALIAS=%s", buf);

#undef PUT_ENVP

	return 0;
}

#else

static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	return -ENODEV;
}

#endif /* CONFIG_HOTPLUG */


int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
			     struct module *owner)
{
	int error;

	drv->driver.bus = &ieee1394_bus_type;
	drv->driver.owner = owner;
	drv->driver.name = drv->name;

	/* This will cause a probe for devices */
	error = driver_register(&drv->driver);
	if (!error)
		nodemgr_create_drv_files(drv);
	return error;
}

void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
{
	nodemgr_remove_drv_files(driver);
	/* This will subsequently disconnect all devices that our driver
	 * is attached to. */
	driver_unregister(&driver->driver);
}


/*
 * This function updates nodes that were present on the bus before the
 * reset and still are after the reset.  The nodeid and the config rom
 * may have changed, and the drivers managing this device must be
 * informed that this device just went through a bus reset, to allow
 * the to take whatever actions required.
 */
static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
				struct host_info *hi, nodeid_t nodeid,
				unsigned int generation)
{
	if (ne->nodeid != nodeid) {
		HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
			   NODE_BUS_ARGS(ne->host, ne->nodeid),
			   NODE_BUS_ARGS(ne->host, nodeid));
		ne->nodeid = nodeid;
	}

	if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
		kfree(ne->csr->private);
		csr1212_destroy_csr(ne->csr);
		ne->csr = csr;

		/* If the node's configrom generation has changed, we
		 * unregister all the unit directories. */
		nodemgr_remove_uds(ne);

		nodemgr_update_bus_options(ne);

		/* Mark the node as new, so it gets re-probed */
		ne->needs_probe = 1;
	} else {
		/* old cache is valid, so update its generation */
		struct nodemgr_csr_info *ci = ne->csr->private;
		ci->generation = generation;
		/* free the partially filled now unneeded new cache */
		kfree(csr->private);
		csr1212_destroy_csr(csr);
	}

	if (ne->in_limbo)
		nodemgr_resume_ne(ne);

	/* Mark the node current */
	ne->generation = generation;
}



static void nodemgr_node_scan_one(struct host_info *hi,
				  nodeid_t nodeid, int generation)
{
	struct hpsb_host *host = hi->host;
	struct node_entry *ne;
	octlet_t guid;
	struct csr1212_csr *csr;
	struct nodemgr_csr_info *ci;
	u8 *speed;

	ci = kmalloc(sizeof(*ci), GFP_KERNEL);
	if (!ci)
		return;

	ci->host = host;
	ci->nodeid = nodeid;
	ci->generation = generation;

	/* Prepare for speed probe which occurs when reading the ROM */
	speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
	if (*speed > host->csr.lnk_spd)
		*speed = host->csr.lnk_spd;
	ci->speed_unverified = *speed > IEEE1394_SPEED_100;

	/* We need to detect when the ConfigROM's generation has changed,
	 * so we only update the node's info when it needs to be.  */

	csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
	if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
		HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
			 NODE_BUS_ARGS(host, nodeid));
		if (csr)
			csr1212_destroy_csr(csr);
		kfree(ci);
		return;
	}

	if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
		/* This isn't a 1394 device, but we let it slide. There
		 * was a report of a device with broken firmware which
		 * reported '2394' instead of '1394', which is obviously a
		 * mistake. One would hope that a non-1394 device never
		 * gets connected to Firewire bus. If someone does, we
		 * shouldn't be held responsible, so we'll allow it with a
		 * warning.  */
		HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
			  NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
	}

	guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
	ne = find_entry_by_guid(guid);

	if (ne && ne->host != host && ne->in_limbo) {
		/* Must have moved this device from one host to another */
		nodemgr_remove_ne(ne);
		ne = NULL;
	}

	if (!ne)
		nodemgr_create_node(guid, csr, hi, nodeid, generation);
	else
		nodemgr_update_node(ne, csr, hi, nodeid, generation);
}


static void nodemgr_node_scan(struct host_info *hi, int generation)
{
	int count;
	struct hpsb_host *host = hi->host;
	struct selfid *sid = (struct selfid *)host->topology_map;
	nodeid_t nodeid = LOCAL_BUS;

	/* Scan each node on the bus */
	for (count = host->selfid_count; count; count--, sid++) {
		if (sid->extended)
			continue;

		if (!sid->link_active) {
			nodeid++;
			continue;
		}
		nodemgr_node_scan_one(hi, nodeid++, generation);
	}
}


static void nodemgr_suspend_ne(struct node_entry *ne)
{
	struct device *dev;
	struct unit_directory *ud;
	struct device_driver *drv;
	int error;

	HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
		   NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);

	ne->in_limbo = 1;
	WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));

	down(&nodemgr_ud_class.sem);
	list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
		ud = container_of(dev, struct unit_directory, unit_dev);
		if (ud->ne != ne)
			continue;

		drv = get_driver(ud->device.driver);
		if (!drv)
			continue;

		error = 1; /* release if suspend is not implemented */
		if (drv->suspend) {
			down(&ud->device.sem);
			error = drv->suspend(&ud->device, PMSG_SUSPEND);
			up(&ud->device.sem);
		}
		if (error)
			device_release_driver(&ud->device);
		put_driver(drv);
	}
	up(&nodemgr_ud_class.sem);
}


static void nodemgr_resume_ne(struct node_entry *ne)
{
	struct device *dev;
	struct unit_directory *ud;
	struct device_driver *drv;

	ne->in_limbo = 0;
	device_remove_file(&ne->device, &dev_attr_ne_in_limbo);

	down(&nodemgr_ud_class.sem);
	list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
		ud = container_of(dev, struct unit_directory, unit_dev);
		if (ud->ne != ne)
			continue;

		drv = get_driver(ud->device.driver);
		if (!drv)
			continue;

		if (drv->resume) {
			down(&ud->device.sem);
			drv->resume(&ud->device);
			up(&ud->device.sem);
		}
		put_driver(drv);
	}
	up(&nodemgr_ud_class.sem);

	HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
		   NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
}


static void nodemgr_update_pdrv(struct node_entry *ne)
{
	struct device *dev;
	struct unit_directory *ud;
	struct device_driver *drv;
	struct hpsb_protocol_driver *pdrv;
	int error;

	down(&nodemgr_ud_class.sem);
	list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
		ud = container_of(dev, struct unit_directory, unit_dev);
		if (ud->ne != ne)
			continue;

		drv = get_driver(ud->device.driver);
		if (!drv)
			continue;

		error = 0;
		pdrv = container_of(drv, struct hpsb_protocol_driver, driver);
		if (pdrv->update) {
			down(&ud->device.sem);
			error = pdrv->update(ud);
			up(&ud->device.sem);
		}
		if (error)
			device_release_driver(&ud->device);
		put_driver(drv);
	}
	up(&nodemgr_ud_class.sem);
}


/* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
 * seems like an optional service but in the end it is practically mandatory
 * as a consequence of these clauses.
 *
 * Note that we cannot do a broadcast write to all nodes at once because some
 * pre-1394a devices would hang. */
static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
{
	const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
	quadlet_t bc_remote, bc_local;
	int error;

	if (!ne->host->is_irm || ne->generation != generation ||
	    ne->nodeid == ne->host->node_id)
		return;

	bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);

	/* Check if the register is implemented and 1394a compliant. */
	error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
			  sizeof(bc_remote));
	if (!error && bc_remote & cpu_to_be32(0x80000000) &&
	    bc_remote != bc_local)
		hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
}


static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
{
	struct device *dev;

	if (ne->host != hi->host || ne->in_limbo)
		return;

	dev = get_device(&ne->device);
	if (!dev)
		return;

	nodemgr_irm_write_bc(ne, generation);

	/* If "needs_probe", then this is either a new or changed node we
	 * rescan totally. If the generation matches for an existing node
	 * (one that existed prior to the bus reset) we send update calls
	 * down to the drivers. Otherwise, this is a dead node and we
	 * suspend it. */
	if (ne->needs_probe)
		nodemgr_process_root_directory(hi, ne);
	else if (ne->generation == generation)
		nodemgr_update_pdrv(ne);
	else
		nodemgr_suspend_ne(ne);

	put_device(dev);
}


static void nodemgr_node_probe(struct host_info *hi, int generation)
{
	struct hpsb_host *host = hi->host;
	struct device *dev;
	struct node_entry *ne;

	/* Do some processing of the nodes we've probed. This pulls them
	 * into the sysfs layer if needed, and can result in processing of
	 * unit-directories, or just updating the node and it's
	 * unit-directories.
	 *
	 * Run updates before probes. Usually, updates are time-critical
	 * while probes are time-consuming. (Well, those probes need some
	 * improvement...) */

	down(&nodemgr_ne_class.sem);
	list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
		ne = container_of(dev, struct node_entry, node_dev);
		if (!ne->needs_probe)
			nodemgr_probe_ne(hi, ne, generation);
	}
	list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
		ne = container_of(dev, struct node_entry, node_dev);
		if (ne->needs_probe)
			nodemgr_probe_ne(hi, ne, generation);
	}
	up(&nodemgr_ne_class.sem);


	/* If we had a bus reset while we were scanning the bus, it is
	 * possible that we did not probe all nodes.  In that case, we
	 * skip the clean up for now, since we could remove nodes that
	 * were still on the bus.  Another bus scan is pending which will
	 * do the clean up eventually.
	 *
	 * Now let's tell the bus to rescan our devices. This may seem
	 * like overhead, but the driver-model core will only scan a
	 * device for a driver when either the device is added, or when a
	 * new driver is added. A bus reset is a good reason to rescan
	 * devices that were there before.  For example, an sbp2 device
	 * may become available for login, if the host that held it was
	 * just removed.  */

	if (generation == get_hpsb_generation(host))
		if (bus_rescan_devices(&ieee1394_bus_type))
			HPSB_DEBUG("bus_rescan_devices had an error");
}

static int nodemgr_send_resume_packet(struct hpsb_host *host)
{
	struct hpsb_packet *packet;
	int error = -ENOMEM;

	packet = hpsb_make_phypacket(host,
			EXTPHYPACKET_TYPE_RESUME |
			NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
	if (packet) {
		packet->no_waiter = 1;
		packet->generation = get_hpsb_generation(host);
		error = hpsb_send_packet(packet);
	}
	if (error)
		HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
			  host->id);
	return error;
}

/* Perform a few high-level IRM responsibilities. */
static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
{
	quadlet_t bc;

	/* if irm_id == -1 then there is no IRM on this bus */
	if (!host->is_irm || host->irm_id == (nodeid_t)-1)
		return 1;

	/* We are a 1394a-2000 compliant IRM. Set the validity bit. */
	host->csr.broadcast_channel |= 0x40000000;

	/* If there is no bus manager then we should set the root node's
	 * force_root bit to promote bus stability per the 1394
	 * spec. (8.4.2.6) */
	if (host->busmgr_id == 0xffff && host->node_count > 1)
	{
		u16 root_node = host->node_count - 1;

		/* get cycle master capability flag from root node */
		if (host->is_cycmst ||
		    (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
				(CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
				&bc, sizeof(quadlet_t)) &&
		     be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
			hpsb_send_phy_config(host, root_node, -1);
		else {
			HPSB_DEBUG("The root node is not cycle master capable; "
				   "selecting a new root node and resetting...");

			if (cycles >= 5) {
				/* Oh screw it! Just leave the bus as it is */
				HPSB_DEBUG("Stopping reset loop for IRM sanity");
				return 1;
			}

			hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
			hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);

			return 0;
		}
	}

	/* Some devices suspend their ports while being connected to an inactive
	 * host adapter, i.e. if connected before the low-level driver is
	 * loaded.  They become visible either when physically unplugged and
	 * replugged, or when receiving a resume packet.  Send one once. */
	if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
		host->resume_packet_sent = 1;

	return 1;
}

/* We need to ensure that if we are not the IRM, that the IRM node is capable of
 * everything we can do, otherwise issue a bus reset and try to become the IRM
 * ourselves. */
static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
{
	quadlet_t bc;
	int status;

	if (hpsb_disable_irm || host->is_irm)
		return 1;

	status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
			   get_hpsb_generation(host),
			   (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
			   &bc, sizeof(quadlet_t));

	if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
		/* The current irm node does not have a valid BROADCAST_CHANNEL
		 * register and we do, so reset the bus with force_root set */
		HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");

		if (cycles >= 5) {
			/* Oh screw it! Just leave the bus as it is */
			HPSB_DEBUG("Stopping reset loop for IRM sanity");
			return 1;
		}

		hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
		hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);

		return 0;
	}

	return 1;
}

static int nodemgr_host_thread(void *__hi)
{
	struct host_info *hi = (struct host_info *)__hi;
	struct hpsb_host *host = hi->host;
	unsigned int g, generation = 0;
	int i, reset_cycles = 0;

	set_freezable();
	/* Setup our device-model entries */
	nodemgr_create_host_dev_files(host);

	for (;;) {
		/* Sleep until next bus reset */
		set_current_state(TASK_INTERRUPTIBLE);
		if (get_hpsb_generation(host) == generation &&
		    !kthread_should_stop())
			schedule();
		__set_current_state(TASK_RUNNING);

		/* Thread may have been woken up to freeze or to exit */
		if (try_to_freeze())
			continue;
		if (kthread_should_stop())
			goto exit;

		/* Pause for 1/4 second in 1/16 second intervals,
		 * to make sure things settle down. */
		g = get_hpsb_generation(host);
		for (i = 0; i < 4 ; i++) {
			msleep_interruptible(63);
			if (kthread_should_stop())
				goto exit;

			/* Now get the generation in which the node ID's we collect
			 * are valid.  During the bus scan we will use this generation
			 * for the read transactions, so that if another reset occurs
			 * during the scan the transactions will fail instead of
			 * returning bogus data. */
			generation = get_hpsb_generation(host);

			/* If we get a reset before we are done waiting, then
			 * start the waiting over again */
			if (generation != g)
				g = generation, i = 0;
		}

		if (!nodemgr_check_irm_capability(host, reset_cycles) ||
		    !nodemgr_do_irm_duties(host, reset_cycles)) {
			reset_cycles++;
			continue;
		}
		reset_cycles = 0;

		/* Scan our nodes to get the bus options and create node
		 * entries. This does not do the sysfs stuff, since that
		 * would trigger uevents and such, which is a bad idea at
		 * this point. */
		nodemgr_node_scan(hi, generation);

		/* This actually does the full probe, with sysfs
		 * registration. */
		nodemgr_node_probe(hi, generation);

		/* Update some of our sysfs symlinks */
		nodemgr_update_host_dev_links(host);
	}
exit:
	HPSB_VERBOSE("NodeMgr: Exiting thread");
	return 0;
}

/**
 * nodemgr_for_each_host - call a function for each IEEE 1394 host
 * @data: an address to supply to the callback
 * @cb: function to call for each host
 *
 * Iterate the hosts, calling a given function with supplied data for each host.
 * If the callback fails on a host, i.e. if it returns a non-zero value, the
 * iteration is stopped.
 *
 * Return value: 0 on success, non-zero on failure (same as returned by last run
 * of the callback).
 */
int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
{
	struct device *dev;
	struct hpsb_host *host;
	int error = 0;

	down(&hpsb_host_class.sem);
	list_for_each_entry(dev, &hpsb_host_class.devices, node) {
		host = container_of(dev, struct hpsb_host, host_dev);

		if ((error = cb(host, data)))
			break;
	}
	up(&hpsb_host_class.sem);

	return error;
}

/* The following two convenience functions use a struct node_entry
 * for addressing a node on the bus.  They are intended for use by any
 * process context, not just the nodemgr thread, so we need to be a
 * little careful when reading out the node ID and generation.  The
 * thing that can go wrong is that we get the node ID, then a bus
 * reset occurs, and then we read the generation.  The node ID is
 * possibly invalid, but the generation is current, and we end up
 * sending a packet to a the wrong node.
 *
 * The solution is to make sure we read the generation first, so that
 * if a reset occurs in the process, we end up with a stale generation
 * and the transactions will fail instead of silently using wrong node
 * ID's.
 */

/**
 * hpsb_node_fill_packet - fill some destination information into a packet
 * @ne: destination node
 * @packet: packet to fill in
 *
 * This will fill in the given, pre-initialised hpsb_packet with the current
 * information from the node entry (host, node ID, bus generation number).
 */
void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
{
	packet->host = ne->host;
	packet->generation = ne->generation;
	barrier();
	packet->node_id = ne->nodeid;
}

int hpsb_node_write(struct node_entry *ne, u64 addr,
		    quadlet_t *buffer, size_t length)
{
	unsigned int generation = ne->generation;

	barrier();
	return hpsb_write(ne->host, ne->nodeid, generation,
			  addr, buffer, length);
}

static void nodemgr_add_host(struct hpsb_host *host)
{
	struct host_info *hi;

	hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
	if (!hi) {
		HPSB_ERR("NodeMgr: out of memory in add host");
		return;
	}
	hi->host = host;
	hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
				 host->id);
	if (IS_ERR(hi->thread)) {
		HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
		hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
	}
}

static void nodemgr_host_reset(struct hpsb_host *host)
{
	struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);

	if (hi) {
		HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
		wake_up_process(hi->thread);
	}
}

static void nodemgr_remove_host(struct hpsb_host *host)
{
	struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);

	if (hi) {
		kthread_stop(hi->thread);
		nodemgr_remove_host_dev(&host->device);
	}
}

static struct hpsb_highlevel nodemgr_highlevel = {
	.name =		"Node manager",
	.add_host =	nodemgr_add_host,
	.host_reset =	nodemgr_host_reset,
	.remove_host =	nodemgr_remove_host,
};

int init_ieee1394_nodemgr(void)
{
	int error;

	error = class_register(&nodemgr_ne_class);
	if (error)
		goto fail_ne;
	error = class_register(&nodemgr_ud_class);
	if (error)
		goto fail_ud;
	error = driver_register(&nodemgr_mid_layer_driver);
	if (error)
		goto fail_ml;
	/* This driver is not used if nodemgr is off (disable_nodemgr=1). */
	nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;

	hpsb_register_highlevel(&nodemgr_highlevel);
	return 0;

fail_ml:
	class_unregister(&nodemgr_ud_class);
fail_ud:
	class_unregister(&nodemgr_ne_class);
fail_ne:
	return error;
}

void cleanup_ieee1394_nodemgr(void)
{
	hpsb_unregister_highlevel(&nodemgr_highlevel);
	driver_unregister(&nodemgr_mid_layer_driver);
	class_unregister(&nodemgr_ud_class);
	class_unregister(&nodemgr_ne_class);
}
OpenPOWER on IntegriCloud