Free Electrons

Embedded Linux Experts

   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
/*
 *    Disk Array driver for HP Smart Array controllers, SCSI Tape module.
 *    (C) Copyright 2001, 2007 Hewlett-Packard Development Company, L.P.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; version 2 of the License.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *    General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 300, Boston, MA
 *    02111-1307, USA.
 *
 *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
 *    
 *    Author: Stephen M. Cameron
 */
#ifdef CONFIG_CISS_SCSI_TAPE

/* Here we have code to present the driver as a scsi driver 
   as it is simultaneously presented as a block driver.  The 
   reason for doing this is to allow access to SCSI tape drives
   through the array controller.  Note in particular, neither 
   physical nor logical disks are presented through the scsi layer. */

#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <linux/atomic.h>

#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h> 

#include "cciss_scsi.h"

#define CCISS_ABORT_MSG 0x00
#define CCISS_RESET_MSG 0x01

static int fill_cmd(ctlr_info_t *h, CommandList_struct *c, __u8 cmd, void *buff,
	size_t size,
	__u8 page_code, unsigned char *scsi3addr,
	int cmd_type);

static CommandList_struct *cmd_alloc(ctlr_info_t *h);
static CommandList_struct *cmd_special_alloc(ctlr_info_t *h);
static void cmd_free(ctlr_info_t *h, CommandList_struct *c);
static void cmd_special_free(ctlr_info_t *h, CommandList_struct *c);

static int cciss_scsi_write_info(struct Scsi_Host *sh,
		char *buffer, /* data buffer */
		int length); 	   /* length of data in buffer */
static int cciss_scsi_show_info(struct seq_file *m,
				struct Scsi_Host *sh);

static int cciss_scsi_queue_command (struct Scsi_Host *h,
				     struct scsi_cmnd *cmd);
static int cciss_eh_device_reset_handler(struct scsi_cmnd *);
static int cciss_eh_abort_handler(struct scsi_cmnd *);

static struct cciss_scsi_hba_t ccissscsi[MAX_CTLR] = {
	{ .name = "cciss0", .ndevices = 0 },
	{ .name = "cciss1", .ndevices = 0 },
	{ .name = "cciss2", .ndevices = 0 },
	{ .name = "cciss3", .ndevices = 0 },
	{ .name = "cciss4", .ndevices = 0 },
	{ .name = "cciss5", .ndevices = 0 },
	{ .name = "cciss6", .ndevices = 0 },
	{ .name = "cciss7", .ndevices = 0 },
};

static struct scsi_host_template cciss_driver_template = {
	.module			= THIS_MODULE,
	.name			= "cciss",
	.proc_name		= "cciss",
	.write_info		= cciss_scsi_write_info,
	.show_info		= cciss_scsi_show_info,
	.queuecommand		= cciss_scsi_queue_command,
	.this_id		= 7,
	.cmd_per_lun		= 1,
	.use_clustering		= DISABLE_CLUSTERING,
	/* Can't have eh_bus_reset_handler or eh_host_reset_handler for cciss */
	.eh_device_reset_handler= cciss_eh_device_reset_handler,
	.eh_abort_handler	= cciss_eh_abort_handler,
};

#pragma pack(1)

#define SCSI_PAD_32 8
#define SCSI_PAD_64 8

struct cciss_scsi_cmd_stack_elem_t {
	CommandList_struct cmd;
	ErrorInfo_struct Err;
	__u32 busaddr;
	int cmdindex;
	u8 pad[IS_32_BIT * SCSI_PAD_32 + IS_64_BIT * SCSI_PAD_64];
};

#pragma pack()

#pragma pack(1)
struct cciss_scsi_cmd_stack_t {
	struct cciss_scsi_cmd_stack_elem_t *pool;
	struct cciss_scsi_cmd_stack_elem_t **elem;
	dma_addr_t cmd_pool_handle;
	int top;
	int nelems;
};
#pragma pack()

struct cciss_scsi_adapter_data_t {
	struct Scsi_Host *scsi_host;
	struct cciss_scsi_cmd_stack_t cmd_stack;
	SGDescriptor_struct **cmd_sg_list;
	int registered;
	spinlock_t lock; // to protect ccissscsi[ctlr]; 
};

#define CPQ_TAPE_LOCK(h, flags) spin_lock_irqsave( \
	&h->scsi_ctlr->lock, flags);
#define CPQ_TAPE_UNLOCK(h, flags) spin_unlock_irqrestore( \
	&h->scsi_ctlr->lock, flags);

static CommandList_struct *
scsi_cmd_alloc(ctlr_info_t *h)
{
	/* assume only one process in here at a time, locking done by caller. */
	/* use h->lock */
	/* might be better to rewrite how we allocate scsi commands in a way that */
	/* needs no locking at all. */

	/* take the top memory chunk off the stack and return it, if any. */
	struct cciss_scsi_cmd_stack_elem_t *c;
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	u64bit temp64;

	sa = h->scsi_ctlr;
	stk = &sa->cmd_stack; 

	if (stk->top < 0) 
		return NULL;
	c = stk->elem[stk->top]; 	
	/* memset(c, 0, sizeof(*c)); */
	memset(&c->cmd, 0, sizeof(c->cmd));
	memset(&c->Err, 0, sizeof(c->Err));
	/* set physical addr of cmd and addr of scsi parameters */
	c->cmd.busaddr = c->busaddr; 
	c->cmd.cmdindex = c->cmdindex;
	/* (__u32) (stk->cmd_pool_handle + 
		(sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top)); */

	temp64.val = (__u64) (c->busaddr + sizeof(CommandList_struct));
	/* (__u64) (stk->cmd_pool_handle + 
		(sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top) +
		 sizeof(CommandList_struct)); */
	stk->top--;
	c->cmd.ErrDesc.Addr.lower = temp64.val32.lower;
	c->cmd.ErrDesc.Addr.upper = temp64.val32.upper;
	c->cmd.ErrDesc.Len = sizeof(ErrorInfo_struct);
	
	c->cmd.ctlr = h->ctlr;
	c->cmd.err_info = &c->Err;

	return (CommandList_struct *) c;
}

static void 
scsi_cmd_free(ctlr_info_t *h, CommandList_struct *c)
{
	/* assume only one process in here at a time, locking done by caller. */
	/* use h->lock */
	/* drop the free memory chunk on top of the stack. */

	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;

	sa = h->scsi_ctlr;
	stk = &sa->cmd_stack; 
	stk->top++;
	if (stk->top >= stk->nelems) {
		dev_err(&h->pdev->dev,
			"scsi_cmd_free called too many times.\n");
		BUG();
	}
	stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) c;
}

static int
scsi_cmd_stack_setup(ctlr_info_t *h, struct cciss_scsi_adapter_data_t *sa)
{
	int i;
	struct cciss_scsi_cmd_stack_t *stk;
	size_t size;

	stk = &sa->cmd_stack;
	stk->nelems = cciss_tape_cmds + 2;
	sa->cmd_sg_list = cciss_allocate_sg_chain_blocks(h,
		h->chainsize, stk->nelems);
	if (!sa->cmd_sg_list && h->chainsize > 0)
		return -ENOMEM;

	size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * stk->nelems;

	/* Check alignment, see cciss_cmd.h near CommandList_struct def. */
	BUILD_BUG_ON((sizeof(*stk->pool) % COMMANDLIST_ALIGNMENT) != 0);
	/* pci_alloc_consistent guarantees 32-bit DMA address will be used */
	stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
		pci_alloc_consistent(h->pdev, size, &stk->cmd_pool_handle);

	if (stk->pool == NULL) {
		cciss_free_sg_chain_blocks(sa->cmd_sg_list, stk->nelems);
		sa->cmd_sg_list = NULL;
		return -ENOMEM;
	}
	stk->elem = kmalloc(sizeof(stk->elem[0]) * stk->nelems, GFP_KERNEL);
	if (!stk->elem) {
		pci_free_consistent(h->pdev, size, stk->pool,
		stk->cmd_pool_handle);
		return -1;
	}
	for (i = 0; i < stk->nelems; i++) {
		stk->elem[i] = &stk->pool[i];
		stk->elem[i]->busaddr = (__u32) (stk->cmd_pool_handle + 
			(sizeof(struct cciss_scsi_cmd_stack_elem_t) * i));
		stk->elem[i]->cmdindex = i;
	}
	stk->top = stk->nelems-1;
	return 0;
}

static void
scsi_cmd_stack_free(ctlr_info_t *h)
{
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	size_t size;

	sa = h->scsi_ctlr;
	stk = &sa->cmd_stack; 
	if (stk->top != stk->nelems-1) {
		dev_warn(&h->pdev->dev,
			"bug: %d scsi commands are still outstanding.\n",
			stk->nelems - stk->top);
	}
	size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * stk->nelems;

	pci_free_consistent(h->pdev, size, stk->pool, stk->cmd_pool_handle);
	stk->pool = NULL;
	cciss_free_sg_chain_blocks(sa->cmd_sg_list, stk->nelems);
	kfree(stk->elem);
	stk->elem = NULL;
}

#if 0
static int xmargin=8;
static int amargin=60;

static void
print_bytes (unsigned char *c, int len, int hex, int ascii)
{

	int i;
	unsigned char *x;

	if (hex)
	{
		x = c;
		for (i=0;i<len;i++)
		{
			if ((i % xmargin) == 0 && i>0) printk("\n");
			if ((i % xmargin) == 0) printk("0x%04x:", i);
			printk(" %02x", *x);
			x++;
		}
		printk("\n");
	}
	if (ascii)
	{
		x = c;
		for (i=0;i<len;i++)
		{
			if ((i % amargin) == 0 && i>0) printk("\n");
			if ((i % amargin) == 0) printk("0x%04x:", i);
			if (*x > 26 && *x < 128) printk("%c", *x);
			else printk(".");
			x++;
		}
		printk("\n");
	}
}

static void
print_cmd(CommandList_struct *cp)
{
	printk("queue:%d\n", cp->Header.ReplyQueue);
	printk("sglist:%d\n", cp->Header.SGList);
	printk("sgtot:%d\n", cp->Header.SGTotal);
	printk("Tag:0x%08x/0x%08x\n", cp->Header.Tag.upper, 
			cp->Header.Tag.lower);
	printk("LUN:0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
		cp->Header.LUN.LunAddrBytes[0],
		cp->Header.LUN.LunAddrBytes[1],
		cp->Header.LUN.LunAddrBytes[2],
		cp->Header.LUN.LunAddrBytes[3],
		cp->Header.LUN.LunAddrBytes[4],
		cp->Header.LUN.LunAddrBytes[5],
		cp->Header.LUN.LunAddrBytes[6],
		cp->Header.LUN.LunAddrBytes[7]);
	printk("CDBLen:%d\n", cp->Request.CDBLen);
	printk("Type:%d\n",cp->Request.Type.Type);
	printk("Attr:%d\n",cp->Request.Type.Attribute);
	printk(" Dir:%d\n",cp->Request.Type.Direction);
	printk("Timeout:%d\n",cp->Request.Timeout);
	printk( "CDB: %02x %02x %02x %02x %02x %02x %02x %02x"
		" %02x %02x %02x %02x %02x %02x %02x %02x\n",
		cp->Request.CDB[0], cp->Request.CDB[1],
		cp->Request.CDB[2], cp->Request.CDB[3],
		cp->Request.CDB[4], cp->Request.CDB[5],
		cp->Request.CDB[6], cp->Request.CDB[7],
		cp->Request.CDB[8], cp->Request.CDB[9],
		cp->Request.CDB[10], cp->Request.CDB[11],
		cp->Request.CDB[12], cp->Request.CDB[13],
		cp->Request.CDB[14], cp->Request.CDB[15]),
	printk("edesc.Addr: 0x%08x/0%08x, Len  = %d\n", 
		cp->ErrDesc.Addr.upper, cp->ErrDesc.Addr.lower, 
			cp->ErrDesc.Len);
	printk("sgs..........Errorinfo:\n");
	printk("scsistatus:%d\n", cp->err_info->ScsiStatus);
	printk("senselen:%d\n", cp->err_info->SenseLen);
	printk("cmd status:%d\n", cp->err_info->CommandStatus);
	printk("resid cnt:%d\n", cp->err_info->ResidualCnt);
	printk("offense size:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_size);
	printk("offense byte:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_num);
	printk("offense value:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_value);
			
}

#endif

static int 
find_bus_target_lun(ctlr_info_t *h, int *bus, int *target, int *lun)
{
	/* finds an unused bus, target, lun for a new device */
	/* assumes h->scsi_ctlr->lock is held */
	int i, found=0;
	unsigned char target_taken[CCISS_MAX_SCSI_DEVS_PER_HBA];

	memset(&target_taken[0], 0, CCISS_MAX_SCSI_DEVS_PER_HBA);

	target_taken[SELF_SCSI_ID] = 1;	
	for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++)
		target_taken[ccissscsi[h->ctlr].dev[i].target] = 1;
	
	for (i = 0; i < CCISS_MAX_SCSI_DEVS_PER_HBA; i++) {
		if (!target_taken[i]) {
			*bus = 0; *target=i; *lun = 0; found=1;
			break;
		}
	}
	return (!found);	
}
struct scsi2map {
	char scsi3addr[8];
	int bus, target, lun;
};

static int 
cciss_scsi_add_entry(ctlr_info_t *h, int hostno,
		struct cciss_scsi_dev_t *device,
		struct scsi2map *added, int *nadded)
{
	/* assumes h->scsi_ctlr->lock is held */
	int n = ccissscsi[h->ctlr].ndevices;
	struct cciss_scsi_dev_t *sd;
	int i, bus, target, lun;
	unsigned char addr1[8], addr2[8];

	if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
		dev_warn(&h->pdev->dev, "Too many devices, "
			"some will be inaccessible.\n");
		return -1;
	}

	bus = target = -1;
	lun = 0;
	/* Is this device a non-zero lun of a multi-lun device */
	/* byte 4 of the 8-byte LUN addr will contain the logical unit no. */
	if (device->scsi3addr[4] != 0) {
		/* Search through our list and find the device which */
		/* has the same 8 byte LUN address, excepting byte 4. */
		/* Assign the same bus and target for this new LUN. */
		/* Use the logical unit number from the firmware. */
		memcpy(addr1, device->scsi3addr, 8);
		addr1[4] = 0;
		for (i = 0; i < n; i++) {
			sd = &ccissscsi[h->ctlr].dev[i];
			memcpy(addr2, sd->scsi3addr, 8);
			addr2[4] = 0;
			/* differ only in byte 4? */
			if (memcmp(addr1, addr2, 8) == 0) {
				bus = sd->bus;
				target = sd->target;
				lun = device->scsi3addr[4];
				break;
			}
		}
	}

	sd = &ccissscsi[h->ctlr].dev[n];
	if (lun == 0) {
		if (find_bus_target_lun(h,
			&sd->bus, &sd->target, &sd->lun) != 0)
			return -1;
	} else {
		sd->bus = bus;
		sd->target = target;
		sd->lun = lun;
	}
	added[*nadded].bus = sd->bus;
	added[*nadded].target = sd->target;
	added[*nadded].lun = sd->lun;
	(*nadded)++;

	memcpy(sd->scsi3addr, device->scsi3addr, 8);
	memcpy(sd->vendor, device->vendor, sizeof(sd->vendor));
	memcpy(sd->revision, device->revision, sizeof(sd->revision));
	memcpy(sd->device_id, device->device_id, sizeof(sd->device_id));
	sd->devtype = device->devtype;

	ccissscsi[h->ctlr].ndevices++;

	/* initially, (before registering with scsi layer) we don't 
	   know our hostno and we don't want to print anything first 
	   time anyway (the scsi layer's inquiries will show that info) */
	if (hostno != -1)
		dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d added.\n",
			scsi_device_type(sd->devtype), hostno,
			sd->bus, sd->target, sd->lun);
	return 0;
}

static void
cciss_scsi_remove_entry(ctlr_info_t *h, int hostno, int entry,
	struct scsi2map *removed, int *nremoved)
{
	/* assumes h->ctlr]->scsi_ctlr->lock is held */
	int i;
	struct cciss_scsi_dev_t sd;

	if (entry < 0 || entry >= CCISS_MAX_SCSI_DEVS_PER_HBA) return;
	sd = ccissscsi[h->ctlr].dev[entry];
	removed[*nremoved].bus    = sd.bus;
	removed[*nremoved].target = sd.target;
	removed[*nremoved].lun    = sd.lun;
	(*nremoved)++;
	for (i = entry; i < ccissscsi[h->ctlr].ndevices-1; i++)
		ccissscsi[h->ctlr].dev[i] = ccissscsi[h->ctlr].dev[i+1];
	ccissscsi[h->ctlr].ndevices--;
	dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d removed.\n",
		scsi_device_type(sd.devtype), hostno,
			sd.bus, sd.target, sd.lun);
}


#define SCSI3ADDR_EQ(a,b) ( \
	(a)[7] == (b)[7] && \
	(a)[6] == (b)[6] && \
	(a)[5] == (b)[5] && \
	(a)[4] == (b)[4] && \
	(a)[3] == (b)[3] && \
	(a)[2] == (b)[2] && \
	(a)[1] == (b)[1] && \
	(a)[0] == (b)[0])

static void fixup_botched_add(ctlr_info_t *h, char *scsi3addr)
{
	/* called when scsi_add_device fails in order to re-adjust */
	/* ccissscsi[] to match the mid layer's view. */
	unsigned long flags;
	int i, j;
	CPQ_TAPE_LOCK(h, flags);
	for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
		if (memcmp(scsi3addr,
				ccissscsi[h->ctlr].dev[i].scsi3addr, 8) == 0) {
			for (j = i; j < ccissscsi[h->ctlr].ndevices-1; j++)
				ccissscsi[h->ctlr].dev[j] =
					ccissscsi[h->ctlr].dev[j+1];
			ccissscsi[h->ctlr].ndevices--;
			break;
		}
	}
	CPQ_TAPE_UNLOCK(h, flags);
}

static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
	struct cciss_scsi_dev_t *dev2)
{
	return dev1->devtype == dev2->devtype &&
		memcmp(dev1->scsi3addr, dev2->scsi3addr,
			sizeof(dev1->scsi3addr)) == 0 &&
		memcmp(dev1->device_id, dev2->device_id,
			sizeof(dev1->device_id)) == 0 &&
		memcmp(dev1->vendor, dev2->vendor,
			sizeof(dev1->vendor)) == 0 &&
		memcmp(dev1->model, dev2->model,
			sizeof(dev1->model)) == 0 &&
		memcmp(dev1->revision, dev2->revision,
			sizeof(dev1->revision)) == 0;
}

static int
adjust_cciss_scsi_table(ctlr_info_t *h, int hostno,
	struct cciss_scsi_dev_t sd[], int nsds)
{
	/* sd contains scsi3 addresses and devtypes, but
	   bus target and lun are not filled in.  This funciton
	   takes what's in sd to be the current and adjusts
	   ccissscsi[] to be in line with what's in sd. */ 

	int i,j, found, changes=0;
	struct cciss_scsi_dev_t *csd;
	unsigned long flags;
	struct scsi2map *added, *removed;
	int nadded, nremoved;
	struct Scsi_Host *sh = NULL;

	added = kzalloc(sizeof(*added) * CCISS_MAX_SCSI_DEVS_PER_HBA,
			GFP_KERNEL);
	removed = kzalloc(sizeof(*removed) * CCISS_MAX_SCSI_DEVS_PER_HBA,
			GFP_KERNEL);

	if (!added || !removed) {
		dev_warn(&h->pdev->dev,
			"Out of memory in adjust_cciss_scsi_table\n");
		goto free_and_out;
	}

	CPQ_TAPE_LOCK(h, flags);

	if (hostno != -1)  /* if it's not the first time... */
		sh = h->scsi_ctlr->scsi_host;

	/* find any devices in ccissscsi[] that are not in 
	   sd[] and remove them from ccissscsi[] */

	i = 0;
	nremoved = 0;
	nadded = 0;
	while (i < ccissscsi[h->ctlr].ndevices) {
		csd = &ccissscsi[h->ctlr].dev[i];
		found=0;
		for (j=0;j<nsds;j++) {
			if (SCSI3ADDR_EQ(sd[j].scsi3addr,
				csd->scsi3addr)) {
				if (device_is_the_same(&sd[j], csd))
					found=2;
				else
					found=1;
				break;
			}
		}

		if (found == 0) { /* device no longer present. */ 
			changes++;
			cciss_scsi_remove_entry(h, hostno, i,
				removed, &nremoved);
			/* remove ^^^, hence i not incremented */
		} else if (found == 1) { /* device is different in some way */
			changes++;
			dev_info(&h->pdev->dev,
				"device c%db%dt%dl%d has changed.\n",
				hostno, csd->bus, csd->target, csd->lun);
			cciss_scsi_remove_entry(h, hostno, i,
				removed, &nremoved);
			/* remove ^^^, hence i not incremented */
			if (cciss_scsi_add_entry(h, hostno, &sd[j],
				added, &nadded) != 0)
				/* we just removed one, so add can't fail. */
					BUG();
			csd->devtype = sd[j].devtype;
			memcpy(csd->device_id, sd[j].device_id,
				sizeof(csd->device_id));
			memcpy(csd->vendor, sd[j].vendor,
				sizeof(csd->vendor));
			memcpy(csd->model, sd[j].model,
				sizeof(csd->model));
			memcpy(csd->revision, sd[j].revision,
				sizeof(csd->revision));
		} else 		/* device is same as it ever was, */
			i++;	/* so just move along. */
	}

	/* Now, make sure every device listed in sd[] is also
 	   listed in ccissscsi[], adding them if they aren't found */

	for (i=0;i<nsds;i++) {
		found=0;
		for (j = 0; j < ccissscsi[h->ctlr].ndevices; j++) {
			csd = &ccissscsi[h->ctlr].dev[j];
			if (SCSI3ADDR_EQ(sd[i].scsi3addr,
				csd->scsi3addr)) {
				if (device_is_the_same(&sd[i], csd))
					found=2;	/* found device */
				else
					found=1; 	/* found a bug. */
				break;
			}
		}
		if (!found) {
			changes++;
			if (cciss_scsi_add_entry(h, hostno, &sd[i],
				added, &nadded) != 0)
				break;
		} else if (found == 1) {
			/* should never happen... */
			changes++;
			dev_warn(&h->pdev->dev,
				"device unexpectedly changed\n");
			/* but if it does happen, we just ignore that device */
		}
	}
	CPQ_TAPE_UNLOCK(h, flags);

	/* Don't notify scsi mid layer of any changes the first time through */
	/* (or if there are no changes) scsi_scan_host will do it later the */
	/* first time through. */
	if (hostno == -1 || !changes)
		goto free_and_out;

	/* Notify scsi mid layer of any removed devices */
	for (i = 0; i < nremoved; i++) {
		struct scsi_device *sdev =
			scsi_device_lookup(sh, removed[i].bus,
				removed[i].target, removed[i].lun);
		if (sdev != NULL) {
			scsi_remove_device(sdev);
			scsi_device_put(sdev);
		} else {
			/* We don't expect to get here. */
			/* future cmds to this device will get selection */
			/* timeout as if the device was gone. */
			dev_warn(&h->pdev->dev, "didn't find "
				"c%db%dt%dl%d\n for removal.",
				hostno, removed[i].bus,
				removed[i].target, removed[i].lun);
		}
	}

	/* Notify scsi mid layer of any added devices */
	for (i = 0; i < nadded; i++) {
		int rc;
		rc = scsi_add_device(sh, added[i].bus,
			added[i].target, added[i].lun);
		if (rc == 0)
			continue;
		dev_warn(&h->pdev->dev, "scsi_add_device "
			"c%db%dt%dl%d failed, device not added.\n",
			hostno, added[i].bus, added[i].target, added[i].lun);
		/* now we have to remove it from ccissscsi, */
		/* since it didn't get added to scsi mid layer */
		fixup_botched_add(h, added[i].scsi3addr);
	}

free_and_out:
	kfree(added);
	kfree(removed);
	return 0;
}

static int
lookup_scsi3addr(ctlr_info_t *h, int bus, int target, int lun, char *scsi3addr)
{
	int i;
	struct cciss_scsi_dev_t *sd;
	unsigned long flags;

	CPQ_TAPE_LOCK(h, flags);
	for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
		sd = &ccissscsi[h->ctlr].dev[i];
		if (sd->bus == bus &&
		    sd->target == target &&
		    sd->lun == lun) {
			memcpy(scsi3addr, &sd->scsi3addr[0], 8);
			CPQ_TAPE_UNLOCK(h, flags);
			return 0;
		}
	}
	CPQ_TAPE_UNLOCK(h, flags);
	return -1;
}

static void 
cciss_scsi_setup(ctlr_info_t *h)
{
	struct cciss_scsi_adapter_data_t * shba;

	ccissscsi[h->ctlr].ndevices = 0;
	shba = (struct cciss_scsi_adapter_data_t *)
		kmalloc(sizeof(*shba), GFP_KERNEL);	
	if (shba == NULL)
		return;
	shba->scsi_host = NULL;
	spin_lock_init(&shba->lock);
	shba->registered = 0;
	if (scsi_cmd_stack_setup(h, shba) != 0) {
		kfree(shba);
		shba = NULL;
	}
	h->scsi_ctlr = shba;
	return;
}

static void complete_scsi_command(CommandList_struct *c, int timeout,
	__u32 tag)
{
	struct scsi_cmnd *cmd;
	ctlr_info_t *h;
	ErrorInfo_struct *ei;

	ei = c->err_info;

	/* First, see if it was a message rather than a command */
	if (c->Request.Type.Type == TYPE_MSG)  {
		c->cmd_type = CMD_MSG_DONE;
		return;
	}

	cmd = (struct scsi_cmnd *) c->scsi_cmd;
	h = hba[c->ctlr];

	scsi_dma_unmap(cmd);
	if (c->Header.SGTotal > h->max_cmd_sgentries)
		cciss_unmap_sg_chain_block(h, c);

	cmd->result = (DID_OK << 16); 		/* host byte */
	cmd->result |= (COMMAND_COMPLETE << 8);	/* msg byte */
	/* cmd->result |= (GOOD < 1); */		/* status byte */

	cmd->result |= (ei->ScsiStatus);
	/* printk("Scsistatus is 0x%02x\n", ei->ScsiStatus);  */

	/* copy the sense data whether we need to or not. */

	memcpy(cmd->sense_buffer, ei->SenseInfo, 
		ei->SenseLen > SCSI_SENSE_BUFFERSIZE ?
			SCSI_SENSE_BUFFERSIZE : 
			ei->SenseLen);
	scsi_set_resid(cmd, ei->ResidualCnt);

	if(ei->CommandStatus != 0) 
	{ /* an error has occurred */ 
		switch(ei->CommandStatus)
		{
			case CMD_TARGET_STATUS:
				/* Pass it up to the upper layers... */
				if (!ei->ScsiStatus) {
					
	/* Ordinarily, this case should never happen, but there is a bug
	   in some released firmware revisions that allows it to happen
	   if, for example, a 4100 backplane loses power and the tape
	   drive is in it.  We assume that it's a fatal error of some
	   kind because we can't show that it wasn't. We will make it
	   look like selection timeout since that is the most common
	   reason for this to occur, and it's severe enough. */

					cmd->result = DID_NO_CONNECT << 16;
				}
			break;
			case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
			break;
			case CMD_DATA_OVERRUN:
				dev_warn(&h->pdev->dev, "%p has"
					" completed with data overrun "
					"reported\n", c);
			break;
			case CMD_INVALID: {
				/* print_bytes(c, sizeof(*c), 1, 0);
				print_cmd(c); */
     /* We get CMD_INVALID if you address a non-existent tape drive instead
	of a selection timeout (no response).  You will see this if you yank 
	out a tape drive, then try to access it. This is kind of a shame
	because it means that any other CMD_INVALID (e.g. driver bug) will
	get interpreted as a missing target. */
				cmd->result = DID_NO_CONNECT << 16;
				}
			break;
			case CMD_PROTOCOL_ERR:
				cmd->result = DID_ERROR << 16;
				dev_warn(&h->pdev->dev,
					"%p has protocol error\n", c);
                        break;
			case CMD_HARDWARE_ERR:
				cmd->result = DID_ERROR << 16;
				dev_warn(&h->pdev->dev,
					"%p had hardware error\n", c);
                        break;
			case CMD_CONNECTION_LOST:
				cmd->result = DID_ERROR << 16;
				dev_warn(&h->pdev->dev,
					"%p had connection lost\n", c);
			break;
			case CMD_ABORTED:
				cmd->result = DID_ABORT << 16;
				dev_warn(&h->pdev->dev, "%p was aborted\n", c);
			break;
			case CMD_ABORT_FAILED:
				cmd->result = DID_ERROR << 16;
				dev_warn(&h->pdev->dev,
					"%p reports abort failed\n", c);
			break;
			case CMD_UNSOLICITED_ABORT:
				cmd->result = DID_ABORT << 16;
				dev_warn(&h->pdev->dev, "%p aborted due to an "
					"unsolicited abort\n", c);
			break;
			case CMD_TIMEOUT:
				cmd->result = DID_TIME_OUT << 16;
				dev_warn(&h->pdev->dev, "%p timedout\n", c);
			break;
			case CMD_UNABORTABLE:
				cmd->result = DID_ERROR << 16;
				dev_warn(&h->pdev->dev, "c %p command "
					"unabortable\n", c);
			break;
			default:
				cmd->result = DID_ERROR << 16;
				dev_warn(&h->pdev->dev,
					"%p returned unknown status %x\n", c,
						ei->CommandStatus); 
		}
	}
	cmd->scsi_done(cmd);
	scsi_cmd_free(h, c);
}

static int
cciss_scsi_detect(ctlr_info_t *h)
{
	struct Scsi_Host *sh;
	int error;

	sh = scsi_host_alloc(&cciss_driver_template, sizeof(struct ctlr_info *));
	if (sh == NULL)
		goto fail;
	sh->io_port = 0;	// good enough?  FIXME, 
	sh->n_io_port = 0;	// I don't think we use these two...
	sh->this_id = SELF_SCSI_ID;  
	sh->can_queue = cciss_tape_cmds;
	sh->sg_tablesize = h->maxsgentries;
	sh->max_cmd_len = MAX_COMMAND_SIZE;
	sh->max_sectors = h->cciss_max_sectors;

	((struct cciss_scsi_adapter_data_t *) 
		h->scsi_ctlr)->scsi_host = sh;
	sh->hostdata[0] = (unsigned long) h;
	sh->irq = h->intr[SIMPLE_MODE_INT];
	sh->unique_id = sh->irq;
	error = scsi_add_host(sh, &h->pdev->dev);
	if (error)
		goto fail_host_put;
	scsi_scan_host(sh);
	return 1;

 fail_host_put:
	scsi_host_put(sh);
 fail:
	return 0;
}

static void
cciss_unmap_one(struct pci_dev *pdev,
		CommandList_struct *c,
		size_t buflen,
		int data_direction)
{
	u64bit addr64;

	addr64.val32.lower = c->SG[0].Addr.lower;
	addr64.val32.upper = c->SG[0].Addr.upper;
	pci_unmap_single(pdev, (dma_addr_t) addr64.val, buflen, data_direction);
}

static void
cciss_map_one(struct pci_dev *pdev,
		CommandList_struct *c,
		unsigned char *buf,
		size_t buflen,
		int data_direction)
{
	__u64 addr64;

	addr64 = (__u64) pci_map_single(pdev, buf, buflen, data_direction);
	c->SG[0].Addr.lower =
	  (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
	c->SG[0].Addr.upper =
	  (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
	c->SG[0].Len = buflen;
	c->Header.SGList = (__u8) 1;   /* no. SGs contig in this cmd */
	c->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */
}

static int
cciss_scsi_do_simple_cmd(ctlr_info_t *h,
			CommandList_struct *c,
			unsigned char *scsi3addr, 
			unsigned char *cdb,
			unsigned char cdblen,
			unsigned char *buf, int bufsize,
			int direction)
{
	DECLARE_COMPLETION_ONSTACK(wait);

	c->cmd_type = CMD_IOCTL_PEND; /* treat this like an ioctl */
	c->scsi_cmd = NULL;
	c->Header.ReplyQueue = 0;  /* unused in simple mode */
	memcpy(&c->Header.LUN, scsi3addr, sizeof(c->Header.LUN));
	c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
	// Fill in the request block...

	/* printk("Using scsi3addr 0x%02x%0x2%0x2%0x2%0x2%0x2%0x2%0x2\n", 
		scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3],
		scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]); */

	memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
	memcpy(c->Request.CDB, cdb, cdblen);
	c->Request.Timeout = 0;
	c->Request.CDBLen = cdblen;
	c->Request.Type.Type = TYPE_CMD;
	c->Request.Type.Attribute = ATTR_SIMPLE;
	c->Request.Type.Direction = direction;

	/* Fill in the SG list and do dma mapping */
	cciss_map_one(h->pdev, c, (unsigned char *) buf,
			bufsize, DMA_FROM_DEVICE); 

	c->waiting = &wait;
	enqueue_cmd_and_start_io(h, c);
	wait_for_completion(&wait);

	/* undo the dma mapping */
	cciss_unmap_one(h->pdev, c, bufsize, DMA_FROM_DEVICE);
	return(0);
}

static void 
cciss_scsi_interpret_error(ctlr_info_t *h, CommandList_struct *c)
{
	ErrorInfo_struct *ei;

	ei = c->err_info;
	switch(ei->CommandStatus)
	{
		case CMD_TARGET_STATUS:
			dev_warn(&h->pdev->dev,
				"cmd %p has completed with errors\n", c);
			dev_warn(&h->pdev->dev,
				"cmd %p has SCSI Status = %x\n",
				c, ei->ScsiStatus);
			if (ei->ScsiStatus == 0)
				dev_warn(&h->pdev->dev,
				"SCSI status is abnormally zero.  "
				"(probably indicates selection timeout "
				"reported incorrectly due to a known "
				"firmware bug, circa July, 2001.)\n");
		break;
		case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
			dev_info(&h->pdev->dev, "UNDERRUN\n");
		break;
		case CMD_DATA_OVERRUN:
			dev_warn(&h->pdev->dev, "%p has"
				" completed with data overrun "
				"reported\n", c);
		break;
		case CMD_INVALID: {
			/* controller unfortunately reports SCSI passthru's */
			/* to non-existent targets as invalid commands. */
			dev_warn(&h->pdev->dev,
				"%p is reported invalid (probably means "
				"target device no longer present)\n", c);
			/* print_bytes((unsigned char *) c, sizeof(*c), 1, 0);
			print_cmd(c);  */
			}
		break;
		case CMD_PROTOCOL_ERR:
			dev_warn(&h->pdev->dev, "%p has protocol error\n", c);
		break;
		case CMD_HARDWARE_ERR:
			/* cmd->result = DID_ERROR << 16; */
			dev_warn(&h->pdev->dev, "%p had hardware error\n", c);
		break;
		case CMD_CONNECTION_LOST:
			dev_warn(&h->pdev->dev, "%p had connection lost\n", c);
		break;
		case CMD_ABORTED:
			dev_warn(&h->pdev->dev, "%p was aborted\n", c);
		break;
		case CMD_ABORT_FAILED:
			dev_warn(&h->pdev->dev,
				"%p reports abort failed\n", c);
		break;
		case CMD_UNSOLICITED_ABORT:
			dev_warn(&h->pdev->dev,
				"%p aborted due to an unsolicited abort\n", c);
		break;
		case CMD_TIMEOUT:
			dev_warn(&h->pdev->dev, "%p timedout\n", c);
		break;
		case CMD_UNABORTABLE:
			dev_warn(&h->pdev->dev,
				"%p unabortable\n", c);
		break;
		default:
			dev_warn(&h->pdev->dev,
				"%p returned unknown status %x\n",
				c, ei->CommandStatus);
	}
}

static int
cciss_scsi_do_inquiry(ctlr_info_t *h, unsigned char *scsi3addr,
	unsigned char page, unsigned char *buf,
	unsigned char bufsize)
{
	int rc;
	CommandList_struct *c;
	char cdb[6];
	ErrorInfo_struct *ei;
	unsigned long flags;

	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);

	if (c == NULL) {			/* trouble... */
		printk("cmd_alloc returned NULL!\n");
		return -1;
	}

	ei = c->err_info;

	cdb[0] = CISS_INQUIRY;
	cdb[1] = (page != 0);
	cdb[2] = page;
	cdb[3] = 0;
	cdb[4] = bufsize;
	cdb[5] = 0;
	rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr, cdb,
				6, buf, bufsize, XFER_READ);

	if (rc != 0) return rc; /* something went wrong */

	if (ei->CommandStatus != 0 && 
	    ei->CommandStatus != CMD_DATA_UNDERRUN) {
		cciss_scsi_interpret_error(h, c);
		rc = -1;
	}
	spin_lock_irqsave(&h->lock, flags);
	scsi_cmd_free(h, c);
	spin_unlock_irqrestore(&h->lock, flags);
	return rc;	
}

/* Get the device id from inquiry page 0x83 */
static int cciss_scsi_get_device_id(ctlr_info_t *h, unsigned char *scsi3addr,
	unsigned char *device_id, int buflen)
{
	int rc;
	unsigned char *buf;

	if (buflen > 16)
		buflen = 16;
	buf = kzalloc(64, GFP_KERNEL);
	if (!buf)
		return -1;
	rc = cciss_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
	if (rc == 0)
		memcpy(device_id, &buf[8], buflen);
	kfree(buf);
	return rc != 0;
}

static int
cciss_scsi_do_report_phys_luns(ctlr_info_t *h,
		ReportLunData_struct *buf, int bufsize)
{
	int rc;
	CommandList_struct *c;
	unsigned char cdb[12];
	unsigned char scsi3addr[8]; 
	ErrorInfo_struct *ei;
	unsigned long flags;

	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
	if (c == NULL) {			/* trouble... */
		printk("cmd_alloc returned NULL!\n");
		return -1;
	}

	memset(&scsi3addr[0], 0, 8); /* address the controller */
	cdb[0] = CISS_REPORT_PHYS;
	cdb[1] = 0;
	cdb[2] = 0;
	cdb[3] = 0;
	cdb[4] = 0;
	cdb[5] = 0;
	cdb[6] = (bufsize >> 24) & 0xFF;  //MSB
	cdb[7] = (bufsize >> 16) & 0xFF;
	cdb[8] = (bufsize >> 8) & 0xFF;
	cdb[9] = bufsize & 0xFF;
	cdb[10] = 0;
	cdb[11] = 0;

	rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr,
				cdb, 12, 
				(unsigned char *) buf, 
				bufsize, XFER_READ);

	if (rc != 0) return rc; /* something went wrong */

	ei = c->err_info;
	if (ei->CommandStatus != 0 && 
	    ei->CommandStatus != CMD_DATA_UNDERRUN) {
		cciss_scsi_interpret_error(h, c);
		rc = -1;
	}
	spin_lock_irqsave(&h->lock, flags);
	scsi_cmd_free(h, c);
	spin_unlock_irqrestore(&h->lock, flags);
	return rc;	
}

static void
cciss_update_non_disk_devices(ctlr_info_t *h, int hostno)
{
	/* the idea here is we could get notified from /proc
	   that some devices have changed, so we do a report 
	   physical luns cmd, and adjust our list of devices 
	   accordingly.  (We can't rely on the scsi-mid layer just
	   doing inquiries, because the "busses" that the scsi 
	   mid-layer probes are totally fabricated by this driver,
	   so new devices wouldn't show up.

	   the scsi3addr's of devices won't change so long as the 
	   adapter is not reset.  That means we can rescan and 
	   tell which devices we already know about, vs. new 
	   devices, vs.  disappearing devices.

	   Also, if you yank out a tape drive, then put in a disk
	   in it's place, (say, a configured volume from another 
	   array controller for instance)  _don't_ poke this driver 
           (so it thinks it's still a tape, but _do_ poke the scsi 
           mid layer, so it does an inquiry... the scsi mid layer 
           will see the physical disk.  This would be bad.  Need to
	   think about how to prevent that.  One idea would be to 
	   snoop all scsi responses and if an inquiry repsonse comes
	   back that reports a disk, chuck it an return selection
	   timeout instead and adjust our table...  Not sure i like
	   that though.  

	 */
#define OBDR_TAPE_INQ_SIZE 49
#define OBDR_TAPE_SIG "$DR-10"
	ReportLunData_struct *ld_buff;
	unsigned char *inq_buff;
	unsigned char scsi3addr[8];
	__u32 num_luns=0;
	unsigned char *ch;
	struct cciss_scsi_dev_t *currentsd, *this_device;
	int ncurrent=0;
	int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
	int i;

	ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
	inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
	currentsd = kzalloc(sizeof(*currentsd) *
			(CCISS_MAX_SCSI_DEVS_PER_HBA+1), GFP_KERNEL);
	if (ld_buff == NULL || inq_buff == NULL || currentsd == NULL) {
		printk(KERN_ERR "cciss: out of memory\n");
		goto out;
	}
	this_device = &currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
	if (cciss_scsi_do_report_phys_luns(h, ld_buff, reportlunsize) == 0) {
		ch = &ld_buff->LUNListLength[0];
		num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
		if (num_luns > CISS_MAX_PHYS_LUN) {
			printk(KERN_WARNING 
				"cciss: Maximum physical LUNs (%d) exceeded.  "
				"%d LUNs ignored.\n", CISS_MAX_PHYS_LUN, 
				num_luns - CISS_MAX_PHYS_LUN);
			num_luns = CISS_MAX_PHYS_LUN;
		}
	}
	else {
		printk(KERN_ERR  "cciss: Report physical LUNs failed.\n");
		goto out;
	}


	/* adjust our table of devices */	
	for (i = 0; i < num_luns; i++) {
		/* for each physical lun, do an inquiry */
		if (ld_buff->LUN[i][3] & 0xC0) continue;
		memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
		memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);

		if (cciss_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
			(unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
			/* Inquiry failed (msg printed already) */
			continue; /* so we will skip this device. */

		this_device->devtype = (inq_buff[0] & 0x1f);
		this_device->bus = -1;
		this_device->target = -1;
		this_device->lun = -1;
		memcpy(this_device->scsi3addr, scsi3addr, 8);
		memcpy(this_device->vendor, &inq_buff[8],
			sizeof(this_device->vendor));
		memcpy(this_device->model, &inq_buff[16],
			sizeof(this_device->model));
		memcpy(this_device->revision, &inq_buff[32],
			sizeof(this_device->revision));
		memset(this_device->device_id, 0,
			sizeof(this_device->device_id));
		cciss_scsi_get_device_id(h, scsi3addr,
			this_device->device_id, sizeof(this_device->device_id));

		switch (this_device->devtype)
		{
		  case 0x05: /* CD-ROM */ {

			/* We don't *really* support actual CD-ROM devices,
			 * just this "One Button Disaster Recovery" tape drive
			 * which temporarily pretends to be a CD-ROM drive.
			 * So we check that the device is really an OBDR tape
			 * device by checking for "$DR-10" in bytes 43-48 of
			 * the inquiry data.
			 */
				char obdr_sig[7];

				strncpy(obdr_sig, &inq_buff[43], 6);
				obdr_sig[6] = '\0';
				if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
					/* Not OBDR device, ignore it. */
					break;
			}
			/* fall through . . . */
		  case 0x01: /* sequential access, (tape) */
		  case 0x08: /* medium changer */
			if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
				printk(KERN_INFO "cciss%d: %s ignored, "
					"too many devices.\n", h->ctlr,
					scsi_device_type(this_device->devtype));
				break;
			}
			currentsd[ncurrent] = *this_device;
			ncurrent++;
			break;
		  default: 
			break;
		}
	}

	adjust_cciss_scsi_table(h, hostno, currentsd, ncurrent);
out:
	kfree(inq_buff);
	kfree(ld_buff);
	kfree(currentsd);
	return;
}

static int
is_keyword(char *ptr, int len, char *verb)  // Thanks to ncr53c8xx.c
{
	int verb_len = strlen(verb);
	if (len >= verb_len && !memcmp(verb,ptr,verb_len))
		return verb_len;
	else
		return 0;
}

static int
cciss_scsi_user_command(ctlr_info_t *h, int hostno, char *buffer, int length)
{
	int arg_len;

	if ((arg_len = is_keyword(buffer, length, "rescan")) != 0)
		cciss_update_non_disk_devices(h, hostno);
	else
		return -EINVAL;
	return length;
}

static int
cciss_scsi_write_info(struct Scsi_Host *sh,
		char *buffer, /* data buffer */
		int length) 	   /* length of data in buffer */
{
	ctlr_info_t *h = (ctlr_info_t *) sh->hostdata[0];
	if (h == NULL)  /* This really shouldn't ever happen. */
		return -EINVAL;

	return cciss_scsi_user_command(h, sh->host_no,
			buffer, length);	
} 

static int
cciss_scsi_show_info(struct seq_file *m, struct Scsi_Host *sh)
{

	ctlr_info_t *h = (ctlr_info_t *) sh->hostdata[0];
	int i;

	if (h == NULL)  /* This really shouldn't ever happen. */
		return -EINVAL;

	seq_printf(m, "cciss%d: SCSI host: %d\n",
			h->ctlr, sh->host_no);

	/* this information is needed by apps to know which cciss
	   device corresponds to which scsi host number without
	   having to open a scsi target device node.  The device
	   information is not a duplicate of /proc/scsi/scsi because
	   the two may be out of sync due to scsi hotplug, rather
	   this info is for an app to be able to use to know how to
	   get them back in sync. */

	for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
		struct cciss_scsi_dev_t *sd =
			&ccissscsi[h->ctlr].dev[i];
		seq_printf(m, "c%db%dt%dl%d %02d "
			"0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
			sh->host_no, sd->bus, sd->target, sd->lun,
			sd->devtype,
			sd->scsi3addr[0], sd->scsi3addr[1],
			sd->scsi3addr[2], sd->scsi3addr[3],
			sd->scsi3addr[4], sd->scsi3addr[5],
			sd->scsi3addr[6], sd->scsi3addr[7]);
	}
	return 0;
}

/* cciss_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci 
   dma mapping  and fills in the scatter gather entries of the 
   cciss command, c. */

static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *c,
	struct scsi_cmnd *cmd)
{
	unsigned int len;
	struct scatterlist *sg;
	__u64 addr64;
	int request_nsgs, i, chained, sg_index;
	struct cciss_scsi_adapter_data_t *sa = h->scsi_ctlr;
	SGDescriptor_struct *curr_sg;

	BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);

	chained = 0;
	sg_index = 0;
	curr_sg = c->SG;
	request_nsgs = scsi_dma_map(cmd);
	if (request_nsgs) {
		scsi_for_each_sg(cmd, sg, request_nsgs, i) {
			if (sg_index + 1 == h->max_cmd_sgentries &&
				!chained && request_nsgs - i > 1) {
				chained = 1;
				sg_index = 0;
				curr_sg = sa->cmd_sg_list[c->cmdindex];
			}
			addr64 = (__u64) sg_dma_address(sg);
			len  = sg_dma_len(sg);
			curr_sg[sg_index].Addr.lower =
				(__u32) (addr64 & 0x0FFFFFFFFULL);
			curr_sg[sg_index].Addr.upper =
				(__u32) ((addr64 >> 32) & 0x0FFFFFFFFULL);
			curr_sg[sg_index].Len = len;
			curr_sg[sg_index].Ext = 0;
			++sg_index;
		}
		if (chained)
			cciss_map_sg_chain_block(h, c,
				sa->cmd_sg_list[c->cmdindex],
				(request_nsgs - (h->max_cmd_sgentries - 1)) *
					sizeof(SGDescriptor_struct));
	}
	/* track how many SG entries we are using */
	if (request_nsgs > h->maxSG)
		h->maxSG = request_nsgs;
	c->Header.SGTotal = (u16) request_nsgs + chained;
	if (request_nsgs > h->max_cmd_sgentries)
		c->Header.SGList = h->max_cmd_sgentries;
	else
		c->Header.SGList = c->Header.SGTotal;
	return;
}


static int
cciss_scsi_queue_command_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
	ctlr_info_t *h;
	int rc;
	unsigned char scsi3addr[8];
	CommandList_struct *c;
	unsigned long flags;

	// Get the ptr to our adapter structure (hba[i]) out of cmd->host.
	// We violate cmd->host privacy here.  (Is there another way?)
	h = (ctlr_info_t *) cmd->device->host->hostdata[0];

	rc = lookup_scsi3addr(h, cmd->device->channel, cmd->device->id,
			cmd->device->lun, scsi3addr);
	if (rc != 0) {
		/* the scsi nexus does not match any that we presented... */
		/* pretend to mid layer that we got selection timeout */
		cmd->result = DID_NO_CONNECT << 16;
		done(cmd);
		/* we might want to think about registering controller itself
		   as a processor device on the bus so sg binds to it. */
		return 0;
	}

	/* Ok, we have a reasonable scsi nexus, so send the cmd down, and
           see what the device thinks of it. */

	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
	if (c == NULL) {			/* trouble... */
		dev_warn(&h->pdev->dev, "scsi_cmd_alloc returned NULL!\n");
		/* FIXME: next 3 lines are -> BAD! <- */
		cmd->result = DID_NO_CONNECT << 16;
		done(cmd);
		return 0;
	}

	// Fill in the command list header

	cmd->scsi_done = done;    // save this for use by completion code 

	/* save c in case we have to abort it */
	cmd->host_scribble = (unsigned char *) c;

	c->cmd_type = CMD_SCSI;
	c->scsi_cmd = cmd;
	c->Header.ReplyQueue = 0;  /* unused in simple mode */
	memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
	c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
	
	// Fill in the request block...

	c->Request.Timeout = 0;
	memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
	BUG_ON(cmd->cmd_len > sizeof(c->Request.CDB));
	c->Request.CDBLen = cmd->cmd_len;
	memcpy(c->Request.CDB, cmd->cmnd, cmd->cmd_len);
	c->Request.Type.Type = TYPE_CMD;
	c->Request.Type.Attribute = ATTR_SIMPLE;
	switch(cmd->sc_data_direction)
	{
	  case DMA_TO_DEVICE:
		c->Request.Type.Direction = XFER_WRITE;
		break;
	  case DMA_FROM_DEVICE:
		c->Request.Type.Direction = XFER_READ;
		break;
	  case DMA_NONE:
		c->Request.Type.Direction = XFER_NONE;
		break;
	  case DMA_BIDIRECTIONAL:
		// This can happen if a buggy application does a scsi passthru
		// and sets both inlen and outlen to non-zero. ( see
		// ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )

		c->Request.Type.Direction = XFER_RSVD;
		// This is technically wrong, and cciss controllers should
		// reject it with CMD_INVALID, which is the most correct 
		// response, but non-fibre backends appear to let it 
		// slide by, and give the same results as if this field
		// were set correctly.  Either way is acceptable for
		// our purposes here.

		break;

	  default: 
		dev_warn(&h->pdev->dev, "unknown data direction: %d\n",
			cmd->sc_data_direction);
		BUG();
		break;
	}
	cciss_scatter_gather(h, c, cmd);
	enqueue_cmd_and_start_io(h, c);
	/* the cmd'll come back via intr handler in complete_scsi_command()  */
	return 0;
}

static DEF_SCSI_QCMD(cciss_scsi_queue_command)

static void cciss_unregister_scsi(ctlr_info_t *h)
{
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	unsigned long flags;

	/* we are being forcibly unloaded, and may not refuse. */

	spin_lock_irqsave(&h->lock, flags);
	sa = h->scsi_ctlr;
	stk = &sa->cmd_stack; 

	/* if we weren't ever actually registered, don't unregister */ 
	if (sa->registered) {
		spin_unlock_irqrestore(&h->lock, flags);
		scsi_remove_host(sa->scsi_host);
		scsi_host_put(sa->scsi_host);
		spin_lock_irqsave(&h->lock, flags);
	}

	/* set scsi_host to NULL so our detect routine will 
	   find us on register */
	sa->scsi_host = NULL;
	spin_unlock_irqrestore(&h->lock, flags);
	scsi_cmd_stack_free(h);
	kfree(sa);
}

static int cciss_engage_scsi(ctlr_info_t *h)
{
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	unsigned long flags;

	spin_lock_irqsave(&h->lock, flags);
	sa = h->scsi_ctlr;
	stk = &sa->cmd_stack; 

	if (sa->registered) {
		dev_info(&h->pdev->dev, "SCSI subsystem already engaged.\n");
		spin_unlock_irqrestore(&h->lock, flags);
		return -ENXIO;
	}
	sa->registered = 1;
	spin_unlock_irqrestore(&h->lock, flags);
	cciss_update_non_disk_devices(h, -1);
	cciss_scsi_detect(h);
	return 0;
}

static void
cciss_seq_tape_report(struct seq_file *seq, ctlr_info_t *h)
{
	unsigned long flags;

	CPQ_TAPE_LOCK(h, flags);
	seq_printf(seq,
		"Sequential access devices: %d\n\n",
			ccissscsi[h->ctlr].ndevices);
	CPQ_TAPE_UNLOCK(h, flags);
}

static int wait_for_device_to_become_ready(ctlr_info_t *h,
	unsigned char lunaddr[])
{
	int rc;
	int count = 0;
	int waittime = HZ;
	CommandList_struct *c;

	c = cmd_alloc(h);
	if (!c) {
		dev_warn(&h->pdev->dev, "out of memory in "
			"wait_for_device_to_become_ready.\n");
		return IO_ERROR;
	}

	/* Send test unit ready until device ready, or give up. */
	while (count < 20) {

		/* Wait for a bit.  do this first, because if we send
		 * the TUR right away, the reset will just abort it.
		 */
		schedule_timeout_uninterruptible(waittime);
		count++;

		/* Increase wait time with each try, up to a point. */
		if (waittime < (HZ * 30))
			waittime = waittime * 2;

		/* Send the Test Unit Ready */
		rc = fill_cmd(h, c, TEST_UNIT_READY, NULL, 0, 0,
			lunaddr, TYPE_CMD);
		if (rc == 0)
			rc = sendcmd_withirq_core(h, c, 0);

		(void) process_sendcmd_error(h, c);

		if (rc != 0)
			goto retry_tur;

		if (c->err_info->CommandStatus == CMD_SUCCESS)
			break;

		if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
			c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
			if (c->err_info->SenseInfo[2] == NO_SENSE)
				break;
			if (c->err_info->SenseInfo[2] == UNIT_ATTENTION) {
				unsigned char asc;
				asc = c->err_info->SenseInfo[12];
				check_for_unit_attention(h, c);
				if (asc == POWER_OR_RESET)
					break;
			}
		}
retry_tur:
		dev_warn(&h->pdev->dev, "Waiting %d secs "
			"for device to become ready.\n",
			waittime / HZ);
		rc = 1; /* device not ready. */
	}

	if (rc)
		dev_warn(&h->pdev->dev, "giving up on device.\n");
	else
		dev_warn(&h->pdev->dev, "device is ready.\n");

	cmd_free(h, c);
	return rc;
}

/* Need at least one of these error handlers to keep ../scsi/hosts.c from 
 * complaining.  Doing a host- or bus-reset can't do anything good here. 
 * Despite what it might say in scsi_error.c, there may well be commands
 * on the controller, as the cciss driver registers twice, once as a block
 * device for the logical drives, and once as a scsi device, for any tape
 * drives.  So we know there are no commands out on the tape drives, but we
 * don't know there are no commands on the controller, and it is likely 
 * that there probably are, as the cciss block device is most commonly used
 * as a boot device (embedded controller on HP/Compaq systems.)
*/

static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
{
	int rc;
	CommandList_struct *cmd_in_trouble;
	unsigned char lunaddr[8];
	ctlr_info_t *h;

	/* find the controller to which the command to be aborted was sent */
	h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
	if (h == NULL) /* paranoia */
		return FAILED;
	dev_warn(&h->pdev->dev, "resetting tape drive or medium changer.\n");
	/* find the command that's giving us trouble */
	cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
	if (cmd_in_trouble == NULL) /* paranoia */
		return FAILED;
	memcpy(lunaddr, &cmd_in_trouble->Header.LUN.LunAddrBytes[0], 8);
	/* send a reset to the SCSI LUN which the command was sent to */
	rc = sendcmd_withirq(h, CCISS_RESET_MSG, NULL, 0, 0, lunaddr,
		TYPE_MSG);
	if (rc == 0 && wait_for_device_to_become_ready(h, lunaddr) == 0)
		return SUCCESS;
	dev_warn(&h->pdev->dev, "resetting device failed.\n");
	return FAILED;
}

static int  cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
{
	int rc;
	CommandList_struct *cmd_to_abort;
	unsigned char lunaddr[8];
	ctlr_info_t *h;

	/* find the controller to which the command to be aborted was sent */
	h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
	if (h == NULL) /* paranoia */
		return FAILED;
	dev_warn(&h->pdev->dev, "aborting tardy SCSI cmd\n");

	/* find the command to be aborted */
	cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble;
	if (cmd_to_abort == NULL) /* paranoia */
		return FAILED;
	memcpy(lunaddr, &cmd_to_abort->Header.LUN.LunAddrBytes[0], 8);
	rc = sendcmd_withirq(h, CCISS_ABORT_MSG, &cmd_to_abort->Header.Tag,
		0, 0, lunaddr, TYPE_MSG);
	if (rc == 0)
		return SUCCESS;
	return FAILED;

}

#else /* no CONFIG_CISS_SCSI_TAPE */

/* If no tape support, then these become defined out of existence */

#define cciss_scsi_setup(cntl_num)
#define cciss_engage_scsi(h)

#endif /* CONFIG_CISS_SCSI_TAPE */