summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/scsi/megaraid/megaraid_sas_fp.c
blob: 4f72287860eeea45005301d6fde70507ba4427be (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
/*
 *  Linux MegaRAID driver for SAS based RAID controllers
 *
 *  Copyright (c) 2009-2013  LSI Corporation
 *  Copyright (c) 2013-2014  Avago Technologies
 *
 *  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; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  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, see <http://www.gnu.org/licenses/>.
 *
 *  FILE: megaraid_sas_fp.c
 *
 *  Authors: Avago Technologies
 *           Sumant Patro
 *           Varad Talamacki
 *           Manoj Jose
 *           Kashyap Desai <kashyap.desai@avagotech.com>
 *           Sumit Saxena <sumit.saxena@avagotech.com>
 *
 *  Send feedback to: megaraidlinux.pdl@avagotech.com
 *
 *  Mail to: Avago Technologies, 350 West Trimble Road, Building 90,
 *  San Jose, California 95131
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/uio.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/compat.h>
#include <linux/blkdev.h>
#include <linux/poll.h>

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

#include "megaraid_sas_fusion.h"
#include "megaraid_sas.h"
#include <asm/div64.h>

#define LB_PENDING_CMDS_DEFAULT 4
static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
module_param(lb_pending_cmds, int, S_IRUGO);
MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
	"threshold. Valid Values are 1-128. Default: 4");


#define ABS_DIFF(a, b)   (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
#define MR_LD_STATE_OPTIMAL 3
#define FALSE 0
#define TRUE 1

#define SPAN_DEBUG 0
#define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
#define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
#define SPAN_INVALID  0xff

/* Prototypes */
static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
	PLD_SPAN_INFO ldSpanInfo);
static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
	u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
	struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
	u64 strip, struct MR_DRV_RAID_MAP_ALL *map);

u32 mega_mod64(u64 dividend, u32 divisor)
{
	u64 d;
	u32 remainder;

	if (!divisor)
		printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
	d = dividend;
	remainder = do_div(d, divisor);
	return remainder;
}

/**
 * @param dividend    : Dividend
 * @param divisor    : Divisor
 *
 * @return quotient
 **/
u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
{
	u32 remainder;
	u64 d;

	if (!divisor)
		printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");

	d = dividend;
	remainder = do_div(d, divisor);

	return d;
}

struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
{
	return &map->raidMap.ldSpanMap[ld].ldRaid;
}

static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
						   struct MR_DRV_RAID_MAP_ALL
						   *map)
{
	return &map->raidMap.ldSpanMap[ld].spanBlock[0];
}

static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
{
	return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
}

u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
{
	return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
}

u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
{
	return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
}

u16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
{
	return map->raidMap.devHndlInfo[pd].curDevHdl;
}

u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
{
	return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
}

u8 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
{
	return map->raidMap.ldTgtIdToLd[ldTgtId];
}

static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
					  struct MR_DRV_RAID_MAP_ALL *map)
{
	return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
}

/*
 * This function will Populate Driver Map using firmware raid map
 */
void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
{
	struct fusion_context *fusion = instance->ctrl_context;
	struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
	struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
	int i;
	u16 ld_count;


	struct MR_DRV_RAID_MAP_ALL *drv_map =
			fusion->ld_drv_map[(instance->map_id & 1)];
	struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;

	if (instance->supportmax256vd) {
		memcpy(fusion->ld_drv_map[instance->map_id & 1],
			fusion->ld_map[instance->map_id & 1],
			fusion->current_map_sz);
		/* New Raid map will not set totalSize, so keep expected value
		 * for legacy code in ValidateMapInfo
		 */
		pDrvRaidMap->totalSize =
			cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
	} else {
		fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
			fusion->ld_map[(instance->map_id & 1)];
		pFwRaidMap = &fw_map_old->raidMap;
		ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);

#if VD_EXT_DEBUG
		for (i = 0; i < ld_count; i++) {
			dev_dbg(&instance->pdev->dev, "(%d) :Index 0x%x "
				"Target Id 0x%x Seq Num 0x%x Size 0/%llx\n",
				instance->unique_id, i,
				fw_map_old->raidMap.ldSpanMap[i].ldRaid.targetId,
				fw_map_old->raidMap.ldSpanMap[i].ldRaid.seqNum,
				fw_map_old->raidMap.ldSpanMap[i].ldRaid.size);
		}
#endif

		memset(drv_map, 0, fusion->drv_map_sz);
		pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
		pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
		pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
		for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
			pDrvRaidMap->ldTgtIdToLd[i] =
				(u8)pFwRaidMap->ldTgtIdToLd[i];
		for (i = (MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS);
			i < MAX_LOGICAL_DRIVES_EXT; i++)
			pDrvRaidMap->ldTgtIdToLd[i] = 0xff;
		for (i = 0; i < ld_count; i++) {
			pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
#if VD_EXT_DEBUG
			dev_dbg(&instance->pdev->dev,
				"pFwRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
				"pFwRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
				"size 0x%x\n", i, i,
				pFwRaidMap->ldSpanMap[i].ldRaid.targetId,
				pFwRaidMap->ldSpanMap[i].ldRaid.seqNum,
				(u32)pFwRaidMap->ldSpanMap[i].ldRaid.rowSize);
			dev_dbg(&instance->pdev->dev,
				"pDrvRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
				"pDrvRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
				"size 0x%x\n", i, i,
				pDrvRaidMap->ldSpanMap[i].ldRaid.targetId,
				pDrvRaidMap->ldSpanMap[i].ldRaid.seqNum,
				(u32)pDrvRaidMap->ldSpanMap[i].ldRaid.rowSize);
			dev_dbg(&instance->pdev->dev, "Driver raid map all %p "
				"raid map %p LD RAID MAP %p/%p\n", drv_map,
				pDrvRaidMap, &pFwRaidMap->ldSpanMap[i].ldRaid,
				&pDrvRaidMap->ldSpanMap[i].ldRaid);
#endif
		}
		memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
			sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
		memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
			sizeof(struct MR_DEV_HANDLE_INFO) *
			MAX_RAIDMAP_PHYSICAL_DEVICES);
	}
}

/*
 * This function will validate Map info data provided by FW
 */
u8 MR_ValidateMapInfo(struct megasas_instance *instance)
{
	struct fusion_context *fusion;
	struct MR_DRV_RAID_MAP_ALL *drv_map;
	struct MR_DRV_RAID_MAP *pDrvRaidMap;
	struct LD_LOAD_BALANCE_INFO *lbInfo;
	PLD_SPAN_INFO ldSpanInfo;
	struct MR_LD_RAID         *raid;
	u16 ldCount, num_lds;
	u16 ld;
	u32 expected_size;


	MR_PopulateDrvRaidMap(instance);

	fusion = instance->ctrl_context;
	drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
	pDrvRaidMap = &drv_map->raidMap;

	lbInfo = fusion->load_balance_info;
	ldSpanInfo = fusion->log_to_span;

	if (instance->supportmax256vd)
		expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
	else
		expected_size =
			(sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
			(sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));

	if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
		dev_err(&instance->pdev->dev, "map info structure size 0x%x is not matching with ld count\n",
		       (unsigned int) expected_size);
		dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
			(unsigned int)sizeof(struct MR_LD_SPAN_MAP),
			le32_to_cpu(pDrvRaidMap->totalSize));
		return 0;
	}

	if (instance->UnevenSpanSupport)
		mr_update_span_set(drv_map, ldSpanInfo);

	mr_update_load_balance_params(drv_map, lbInfo);

	num_lds = le16_to_cpu(drv_map->raidMap.ldCount);

	/*Convert Raid capability values to CPU arch */
	for (ldCount = 0; ldCount < num_lds; ldCount++) {
		ld = MR_TargetIdToLdGet(ldCount, drv_map);
		raid = MR_LdRaidGet(ld, drv_map);
		le32_to_cpus((u32 *)&raid->capability);
	}

	return 1;
}

u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
		    struct MR_DRV_RAID_MAP_ALL *map)
{
	struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
	struct MR_QUAD_ELEMENT    *quad;
	struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
	u32                span, j;

	for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {

		for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
			quad = &pSpanBlock->block_span_info.quad[j];

			if (le32_to_cpu(quad->diff) == 0)
				return SPAN_INVALID;
			if (le64_to_cpu(quad->logStart) <= row && row <=
				le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
				le32_to_cpu(quad->diff))) == 0) {
				if (span_blk != NULL) {
					u64  blk, debugBlk;
					blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
					debugBlk = blk;

					blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
					*span_blk = blk;
				}
				return span;
			}
		}
	}
	return SPAN_INVALID;
}

/*
******************************************************************************
*
* Function to print info about span set created in driver from FW raid map
*
* Inputs :
* map    - LD map
* ldSpanInfo - ldSpanInfo per HBA instance
*/
#if SPAN_DEBUG
static int getSpanInfo(struct MR_DRV_RAID_MAP_ALL *map,
	PLD_SPAN_INFO ldSpanInfo)
{

	u8   span;
	u32    element;
	struct MR_LD_RAID *raid;
	LD_SPAN_SET *span_set;
	struct MR_QUAD_ELEMENT    *quad;
	int ldCount;
	u16 ld;

	for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
		ld = MR_TargetIdToLdGet(ldCount, map);
			if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
				continue;
		raid = MR_LdRaidGet(ld, map);
		dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n",
			ld, raid->spanDepth);
		for (span = 0; span < raid->spanDepth; span++)
			dev_dbg(&instance->pdev->dev, "Span=%x,"
			" number of quads=%x\n", span,
			le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
			block_span_info.noElements));
		for (element = 0; element < MAX_QUAD_DEPTH; element++) {
			span_set = &(ldSpanInfo[ld].span_set[element]);
			if (span_set->span_row_data_width == 0)
				break;

			dev_dbg(&instance->pdev->dev, "Span Set %x:"
				"width=%x, diff=%x\n", element,
				(unsigned int)span_set->span_row_data_width,
				(unsigned int)span_set->diff);
			dev_dbg(&instance->pdev->dev, "logical LBA"
				"start=0x%08lx, end=0x%08lx\n",
				(long unsigned int)span_set->log_start_lba,
				(long unsigned int)span_set->log_end_lba);
			dev_dbg(&instance->pdev->dev, "span row start=0x%08lx,"
				" end=0x%08lx\n",
				(long unsigned int)span_set->span_row_start,
				(long unsigned int)span_set->span_row_end);
			dev_dbg(&instance->pdev->dev, "data row start=0x%08lx,"
				" end=0x%08lx\n",
				(long unsigned int)span_set->data_row_start,
				(long unsigned int)span_set->data_row_end);
			dev_dbg(&instance->pdev->dev, "data strip start=0x%08lx,"
				" end=0x%08lx\n",
				(long unsigned int)span_set->data_strip_start,
				(long unsigned int)span_set->data_strip_end);

			for (span = 0; span < raid->spanDepth; span++) {
				if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
					block_span_info.noElements) >=
					element + 1) {
					quad = &map->raidMap.ldSpanMap[ld].
						spanBlock[span].block_span_info.
						quad[element];
				dev_dbg(&instance->pdev->dev, "Span=%x,"
					"Quad=%x, diff=%x\n", span,
					element, le32_to_cpu(quad->diff));
				dev_dbg(&instance->pdev->dev,
					"offset_in_span=0x%08lx\n",
					(long unsigned int)le64_to_cpu(quad->offsetInSpan));
				dev_dbg(&instance->pdev->dev,
					"logical start=0x%08lx, end=0x%08lx\n",
					(long unsigned int)le64_to_cpu(quad->logStart),
					(long unsigned int)le64_to_cpu(quad->logEnd));
				}
			}
		}
	}
	return 0;
}
#endif

/*
******************************************************************************
*
* This routine calculates the Span block for given row using spanset.
*
* Inputs :
*    instance - HBA instance
*    ld   - Logical drive number
*    row        - Row number
*    map    - LD map
*
* Outputs :
*
*    span          - Span number
*    block         - Absolute Block number in the physical disk
*    div_error	   - Devide error code.
*/

u32 mr_spanset_get_span_block(struct megasas_instance *instance,
		u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
{
	struct fusion_context *fusion = instance->ctrl_context;
	struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
	LD_SPAN_SET *span_set;
	struct MR_QUAD_ELEMENT    *quad;
	u32    span, info;
	PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;

	for (info = 0; info < MAX_QUAD_DEPTH; info++) {
		span_set = &(ldSpanInfo[ld].span_set[info]);

		if (span_set->span_row_data_width == 0)
			break;

		if (row > span_set->data_row_end)
			continue;

		for (span = 0; span < raid->spanDepth; span++)
			if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
				block_span_info.noElements) >= info+1) {
				quad = &map->raidMap.ldSpanMap[ld].
					spanBlock[span].
					block_span_info.quad[info];
				if (le32_to_cpu(quad->diff) == 0)
					return SPAN_INVALID;
				if (le64_to_cpu(quad->logStart) <= row  &&
					row <= le64_to_cpu(quad->logEnd)  &&
					(mega_mod64(row - le64_to_cpu(quad->logStart),
						le32_to_cpu(quad->diff))) == 0) {
					if (span_blk != NULL) {
						u64  blk;
						blk = mega_div64_32
						    ((row - le64_to_cpu(quad->logStart)),
						    le32_to_cpu(quad->diff));
						blk = (blk + le64_to_cpu(quad->offsetInSpan))
							 << raid->stripeShift;
						*span_blk = blk;
					}
					return span;
				}
			}
	}
	return SPAN_INVALID;
}

/*
******************************************************************************
*
* This routine calculates the row for given strip using spanset.
*
* Inputs :
*    instance - HBA instance
*    ld   - Logical drive number
*    Strip        - Strip
*    map    - LD map
*
* Outputs :
*
*    row         - row associated with strip
*/

static u64  get_row_from_strip(struct megasas_instance *instance,
	u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
{
	struct fusion_context *fusion = instance->ctrl_context;
	struct MR_LD_RAID	*raid = MR_LdRaidGet(ld, map);
	LD_SPAN_SET	*span_set;
	PLD_SPAN_INFO	ldSpanInfo = fusion->log_to_span;
	u32		info, strip_offset, span, span_offset;
	u64		span_set_Strip, span_set_Row, retval;

	for (info = 0; info < MAX_QUAD_DEPTH; info++) {
		span_set = &(ldSpanInfo[ld].span_set[info]);

		if (span_set->span_row_data_width == 0)
			break;
		if (strip > span_set->data_strip_end)
			continue;

		span_set_Strip = strip - span_set->data_strip_start;
		strip_offset = mega_mod64(span_set_Strip,
				span_set->span_row_data_width);
		span_set_Row = mega_div64_32(span_set_Strip,
				span_set->span_row_data_width) * span_set->diff;
		for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
			if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
				block_span_info.noElements) >= info+1) {
				if (strip_offset >=
					span_set->strip_offset[span])
					span_offset++;
				else
					break;
			}
#if SPAN_DEBUG
		dev_info(&instance->pdev->dev, "Strip 0x%llx,"
			"span_set_Strip 0x%llx, span_set_Row 0x%llx"
			"data width 0x%llx span offset 0x%x\n", strip,
			(unsigned long long)span_set_Strip,
			(unsigned long long)span_set_Row,
			(unsigned long long)span_set->span_row_data_width,
			span_offset);
		dev_info(&instance->pdev->dev, "For strip 0x%llx"
			"row is 0x%llx\n", strip,
			(unsigned long long) span_set->data_row_start +
			(unsigned long long) span_set_Row + (span_offset - 1));
#endif
		retval = (span_set->data_row_start + span_set_Row +
				(span_offset - 1));
		return retval;
	}
	return -1LLU;
}


/*
******************************************************************************
*
* This routine calculates the Start Strip for given row using spanset.
*
* Inputs :
*    instance - HBA instance
*    ld   - Logical drive number
*    row        - Row number
*    map    - LD map
*
* Outputs :
*
*    Strip         - Start strip associated with row
*/

static u64 get_strip_from_row(struct megasas_instance *instance,
		u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
{
	struct fusion_context *fusion = instance->ctrl_context;
	struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
	LD_SPAN_SET *span_set;
	struct MR_QUAD_ELEMENT    *quad;
	PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
	u32    span, info;
	u64  strip;

	for (info = 0; info < MAX_QUAD_DEPTH; info++) {
		span_set = &(ldSpanInfo[ld].span_set[info]);

		if (span_set->span_row_data_width == 0)
			break;
		if (row > span_set->data_row_end)
			continue;

		for (span = 0; span < raid->spanDepth; span++)
			if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
				block_span_info.noElements) >= info+1) {
				quad = &map->raidMap.ldSpanMap[ld].
					spanBlock[span].block_span_info.quad[info];
				if (le64_to_cpu(quad->logStart) <= row  &&
					row <= le64_to_cpu(quad->logEnd)  &&
					mega_mod64((row - le64_to_cpu(quad->logStart)),
					le32_to_cpu(quad->diff)) == 0) {
					strip = mega_div64_32
						(((row - span_set->data_row_start)
							- le64_to_cpu(quad->logStart)),
							le32_to_cpu(quad->diff));
					strip *= span_set->span_row_data_width;
					strip += span_set->data_strip_start;
					strip += span_set->strip_offset[span];
					return strip;
				}
			}
	}
	dev_err(&instance->pdev->dev, "get_strip_from_row"
		"returns invalid strip for ld=%x, row=%lx\n",
		ld, (long unsigned int)row);
	return -1;
}

/*
******************************************************************************
*
* This routine calculates the Physical Arm for given strip using spanset.
*
* Inputs :
*    instance - HBA instance
*    ld   - Logical drive number
*    strip      - Strip
*    map    - LD map
*
* Outputs :
*
*    Phys Arm         - Phys Arm associated with strip
*/

static u32 get_arm_from_strip(struct megasas_instance *instance,
	u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
{
	struct fusion_context *fusion = instance->ctrl_context;
	struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
	LD_SPAN_SET *span_set;
	PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
	u32    info, strip_offset, span, span_offset, retval;

	for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
		span_set = &(ldSpanInfo[ld].span_set[info]);

		if (span_set->span_row_data_width == 0)
			break;
		if (strip > span_set->data_strip_end)
			continue;

		strip_offset = (uint)mega_mod64
				((strip - span_set->data_strip_start),
				span_set->span_row_data_width);

		for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
			if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
				block_span_info.noElements) >= info+1) {
				if (strip_offset >=
					span_set->strip_offset[span])
					span_offset =
						span_set->strip_offset[span];
				else
					break;
			}
#if SPAN_DEBUG
		dev_info(&instance->pdev->dev, "get_arm_from_strip:"
			"for ld=0x%x strip=0x%lx arm is  0x%x\n", ld,
			(long unsigned int)strip, (strip_offset - span_offset));
#endif
		retval = (strip_offset - span_offset);
		return retval;
	}

	dev_err(&instance->pdev->dev, "get_arm_from_strip"
		"returns invalid arm for ld=%x strip=%lx\n",
		ld, (long unsigned int)strip);

	return -1;
}

/* This Function will return Phys arm */
u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
		struct MR_DRV_RAID_MAP_ALL *map)
{
	struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
	/* Need to check correct default value */
	u32    arm = 0;

	switch (raid->level) {
	case 0:
	case 5:
	case 6:
		arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
		break;
	case 1:
		/* start with logical arm */
		arm = get_arm_from_strip(instance, ld, stripe, map);
		if (arm != -1U)
			arm *= 2;
		break;
	}

	return arm;
}


/*
******************************************************************************
*
* This routine calculates the arm, span and block for the specified stripe and
* reference in stripe using spanset
*
* Inputs :
*
*    ld   - Logical drive number
*    stripRow        - Stripe number
*    stripRef    - Reference in stripe
*
* Outputs :
*
*    span          - Span number
*    block         - Absolute Block number in the physical disk
*/
static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
		u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
		struct RAID_CONTEXT *pRAID_Context,
		struct MR_DRV_RAID_MAP_ALL *map)
{
	struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
	u32     pd, arRef;
	u8      physArm, span;
	u64     row;
	u8	retval = TRUE;
	u8	do_invader = 0;
	u64	*pdBlock = &io_info->pdBlock;
	u16	*pDevHandle = &io_info->devHandle;
	u32	logArm, rowMod, armQ, arm;

	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
		instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
		do_invader = 1;

	/*Get row and span from io_info for Uneven Span IO.*/
	row	    = io_info->start_row;
	span	    = io_info->start_span;


	if (raid->level == 6) {
		logArm = get_arm_from_strip(instance, ld, stripRow, map);
		if (logArm == -1U)
			return FALSE;
		rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
		armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
		arm = armQ + 1 + logArm;
		if (arm >= SPAN_ROW_SIZE(map, ld, span))
			arm -= SPAN_ROW_SIZE(map, ld, span);
		physArm = (u8)arm;
	} else
		/* Calculate the arm */
		physArm = get_arm(instance, ld, span, stripRow, map);
	if (physArm == 0xFF)
		return FALSE;

	arRef       = MR_LdSpanArrayGet(ld, span, map);
	pd          = MR_ArPdGet(arRef, physArm, map);

	if (pd != MR_PD_INVALID)
		*pDevHandle = MR_PdDevHandleGet(pd, map);
	else {
		*pDevHandle = MR_PD_INVALID;
		if ((raid->level >= 5) &&
			(!do_invader  || (do_invader &&
			(raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
			pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
		else if (raid->level == 1) {
			pd = MR_ArPdGet(arRef, physArm + 1, map);
			if (pd != MR_PD_INVALID)
				*pDevHandle = MR_PdDevHandleGet(pd, map);
		}
	}

	*pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
	pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
					physArm;
	io_info->span_arm = pRAID_Context->spanArm;
	return retval;
}

/*
******************************************************************************
*
* This routine calculates the arm, span and block for the specified stripe and
* reference in stripe.
*
* Inputs :
*
*    ld   - Logical drive number
*    stripRow        - Stripe number
*    stripRef    - Reference in stripe
*
* Outputs :
*
*    span          - Span number
*    block         - Absolute Block number in the physical disk
*/
u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
		u16 stripRef, struct IO_REQUEST_INFO *io_info,
		struct RAID_CONTEXT *pRAID_Context,
		struct MR_DRV_RAID_MAP_ALL *map)
{
	struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
	u32         pd, arRef;
	u8          physArm, span;
	u64         row;
	u8	    retval = TRUE;
	u8          do_invader = 0;
	u64	    *pdBlock = &io_info->pdBlock;
	u16	    *pDevHandle = &io_info->devHandle;

	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
		instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
		do_invader = 1;

	row =  mega_div64_32(stripRow, raid->rowDataSize);

	if (raid->level == 6) {
		/* logical arm within row */
		u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
		u32 rowMod, armQ, arm;

		if (raid->rowSize == 0)
			return FALSE;
		/* get logical row mod */
		rowMod = mega_mod64(row, raid->rowSize);
		armQ = raid->rowSize-1-rowMod; /* index of Q drive */
		arm = armQ+1+logArm; /* data always logically follows Q */
		if (arm >= raid->rowSize) /* handle wrap condition */
			arm -= raid->rowSize;
		physArm = (u8)arm;
	} else  {
		if (raid->modFactor == 0)
			return FALSE;
		physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
							  raid->modFactor),
					  map);
	}

	if (raid->spanDepth == 1) {
		span = 0;
		*pdBlock = row << raid->stripeShift;
	} else {
		span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
		if (span == SPAN_INVALID)
			return FALSE;
	}

	/* Get the array on which this span is present */
	arRef       = MR_LdSpanArrayGet(ld, span, map);
	pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */

	if (pd != MR_PD_INVALID)
		/* Get dev handle from Pd. */
		*pDevHandle = MR_PdDevHandleGet(pd, map);
	else {
		*pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */
		if ((raid->level >= 5) &&
			(!do_invader  || (do_invader &&
			(raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
			pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
		else if (raid->level == 1) {
			/* Get alternate Pd. */
			pd = MR_ArPdGet(arRef, physArm + 1, map);
			if (pd != MR_PD_INVALID)
				/* Get dev handle from Pd */
				*pDevHandle = MR_PdDevHandleGet(pd, map);
		}
	}

	*pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
	pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
		physArm;
	io_info->span_arm = pRAID_Context->spanArm;
	return retval;
}

/*
******************************************************************************
*
* MR_BuildRaidContext function
*
* This function will initiate command processing.  The start/end row and strip
* information is calculated then the lock is acquired.
* This function will return 0 if region lock was acquired OR return num strips
*/
u8
MR_BuildRaidContext(struct megasas_instance *instance,
		    struct IO_REQUEST_INFO *io_info,
		    struct RAID_CONTEXT *pRAID_Context,
		    struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
{
	struct MR_LD_RAID  *raid;
	u32         ld, stripSize, stripe_mask;
	u64         endLba, endStrip, endRow, start_row, start_strip;
	u64         regStart;
	u32         regSize;
	u8          num_strips, numRows;
	u16         ref_in_start_stripe, ref_in_end_stripe;
	u64         ldStartBlock;
	u32         numBlocks, ldTgtId;
	u8          isRead;
	u8	    retval = 0;
	u8	    startlba_span = SPAN_INVALID;
	u64 *pdBlock = &io_info->pdBlock;

	ldStartBlock = io_info->ldStartBlock;
	numBlocks = io_info->numBlocks;
	ldTgtId = io_info->ldTgtId;
	isRead = io_info->isRead;
	io_info->IoforUnevenSpan = 0;
	io_info->start_span	= SPAN_INVALID;

	ld = MR_TargetIdToLdGet(ldTgtId, map);
	raid = MR_LdRaidGet(ld, map);

	/*
	 * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
	 * return FALSE
	 */
	if (raid->rowDataSize == 0) {
		if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
			return FALSE;
		else if (instance->UnevenSpanSupport) {
			io_info->IoforUnevenSpan = 1;
		} else {
			dev_info(&instance->pdev->dev,
				"raid->rowDataSize is 0, but has SPAN[0]"
				"rowDataSize = 0x%0x,"
				"but there is _NO_ UnevenSpanSupport\n",
				MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
			return FALSE;
		}
	}

	stripSize = 1 << raid->stripeShift;
	stripe_mask = stripSize-1;


	/*
	 * calculate starting row and stripe, and number of strips and rows
	 */
	start_strip         = ldStartBlock >> raid->stripeShift;
	ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
	endLba              = ldStartBlock + numBlocks - 1;
	ref_in_end_stripe   = (u16)(endLba & stripe_mask);
	endStrip            = endLba >> raid->stripeShift;
	num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */

	if (io_info->IoforUnevenSpan) {
		start_row = get_row_from_strip(instance, ld, start_strip, map);
		endRow	  = get_row_from_strip(instance, ld, endStrip, map);
		if (start_row == -1ULL || endRow == -1ULL) {
			dev_info(&instance->pdev->dev, "return from %s %d."
				"Send IO w/o region lock.\n",
				__func__, __LINE__);
			return FALSE;
		}

		if (raid->spanDepth == 1) {
			startlba_span = 0;
			*pdBlock = start_row << raid->stripeShift;
		} else
			startlba_span = (u8)mr_spanset_get_span_block(instance,
						ld, start_row, pdBlock, map);
		if (startlba_span == SPAN_INVALID) {
			dev_info(&instance->pdev->dev, "return from %s %d"
				"for row 0x%llx,start strip %llx"
				"endSrip %llx\n", __func__, __LINE__,
				(unsigned long long)start_row,
				(unsigned long long)start_strip,
				(unsigned long long)endStrip);
			return FALSE;
		}
		io_info->start_span	= startlba_span;
		io_info->start_row	= start_row;
#if SPAN_DEBUG
		dev_dbg(&instance->pdev->dev, "Check Span number from %s %d"
			"for row 0x%llx, start strip 0x%llx end strip 0x%llx"
			" span 0x%x\n", __func__, __LINE__,
			(unsigned long long)start_row,
			(unsigned long long)start_strip,
			(unsigned long long)endStrip, startlba_span);
		dev_dbg(&instance->pdev->dev, "start_row 0x%llx endRow 0x%llx"
			"Start span 0x%x\n", (unsigned long long)start_row,
			(unsigned long long)endRow, startlba_span);
#endif
	} else {
		start_row = mega_div64_32(start_strip, raid->rowDataSize);
		endRow    = mega_div64_32(endStrip, raid->rowDataSize);
	}
	numRows = (u8)(endRow - start_row + 1);

	/*
	 * calculate region info.
	 */

	/* assume region is at the start of the first row */
	regStart            = start_row << raid->stripeShift;
	/* assume this IO needs the full row - we'll adjust if not true */
	regSize             = stripSize;

	/* Check if we can send this I/O via FastPath */
	if (raid->capability.fpCapable) {
		if (isRead)
			io_info->fpOkForIo = (raid->capability.fpReadCapable &&
					      ((num_strips == 1) ||
					       raid->capability.
					       fpReadAcrossStripe));
		else
			io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
					      ((num_strips == 1) ||
					       raid->capability.
					       fpWriteAcrossStripe));
	} else
		io_info->fpOkForIo = FALSE;

	if (numRows == 1) {
		/* single-strip IOs can always lock only the data needed */
		if (num_strips == 1) {
			regStart += ref_in_start_stripe;
			regSize = numBlocks;
		}
		/* multi-strip IOs always need to full stripe locked */
	} else if (io_info->IoforUnevenSpan == 0) {
		/*
		 * For Even span region lock optimization.
		 * If the start strip is the last in the start row
		 */
		if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
			regStart += ref_in_start_stripe;
			/* initialize count to sectors from startref to end
			   of strip */
			regSize = stripSize - ref_in_start_stripe;
		}

		/* add complete rows in the middle of the transfer */
		if (numRows > 2)
			regSize += (numRows-2) << raid->stripeShift;

		/* if IO ends within first strip of last row*/
		if (endStrip == endRow*raid->rowDataSize)
			regSize += ref_in_end_stripe+1;
		else
			regSize += stripSize;
	} else {
		/*
		 * For Uneven span region lock optimization.
		 * If the start strip is the last in the start row
		 */
		if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
				SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
			regStart += ref_in_start_stripe;
			/* initialize count to sectors from
			 * startRef to end of strip
			 */
			regSize = stripSize - ref_in_start_stripe;
		}
		/* Add complete rows in the middle of the transfer*/

		if (numRows > 2)
			/* Add complete rows in the middle of the transfer*/
			regSize += (numRows-2) << raid->stripeShift;

		/* if IO ends within first strip of last row */
		if (endStrip == get_strip_from_row(instance, ld, endRow, map))
			regSize += ref_in_end_stripe + 1;
		else
			regSize += stripSize;
	}

	pRAID_Context->timeoutValue =
		cpu_to_le16(raid->fpIoTimeoutForLd ?
			    raid->fpIoTimeoutForLd :
			    map->raidMap.fpPdIoTimeoutSec);
	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) ||
		(instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
		pRAID_Context->regLockFlags = (isRead) ?
			raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
	else
		pRAID_Context->regLockFlags = (isRead) ?
			REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
	pRAID_Context->VirtualDiskTgtId = raid->targetId;
	pRAID_Context->regLockRowLBA    = cpu_to_le64(regStart);
	pRAID_Context->regLockLength    = cpu_to_le32(regSize);
	pRAID_Context->configSeqNum	= raid->seqNum;
	/* save pointer to raid->LUN array */
	*raidLUN = raid->LUN;


	/*Get Phy Params only if FP capable, or else leave it to MR firmware
	  to do the calculation.*/
	if (io_info->fpOkForIo) {
		retval = io_info->IoforUnevenSpan ?
				mr_spanset_get_phy_params(instance, ld,
					start_strip, ref_in_start_stripe,
					io_info, pRAID_Context, map) :
				MR_GetPhyParams(instance, ld, start_strip,
					ref_in_start_stripe, io_info,
					pRAID_Context, map);
		/* If IO on an invalid Pd, then FP is not possible.*/
		if (io_info->devHandle == MR_PD_INVALID)
			io_info->fpOkForIo = FALSE;
		return retval;
	} else if (isRead) {
		uint stripIdx;
		for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
			retval = io_info->IoforUnevenSpan ?
				mr_spanset_get_phy_params(instance, ld,
				    start_strip + stripIdx,
				    ref_in_start_stripe, io_info,
				    pRAID_Context, map) :
				MR_GetPhyParams(instance, ld,
				    start_strip + stripIdx, ref_in_start_stripe,
				    io_info, pRAID_Context, map);
			if (!retval)
				return TRUE;
		}
	}

#if SPAN_DEBUG
	/* Just for testing what arm we get for strip.*/
	if (io_info->IoforUnevenSpan)
		get_arm_from_strip(instance, ld, start_strip, map);
#endif
	return TRUE;
}

/*
******************************************************************************
*
* This routine pepare spanset info from Valid Raid map and store it into
* local copy of ldSpanInfo per instance data structure.
*
* Inputs :
* map    - LD map
* ldSpanInfo - ldSpanInfo per HBA instance
*
*/
void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
	PLD_SPAN_INFO ldSpanInfo)
{
	u8   span, count;
	u32  element, span_row_width;
	u64  span_row;
	struct MR_LD_RAID *raid;
	LD_SPAN_SET *span_set, *span_set_prev;
	struct MR_QUAD_ELEMENT    *quad;
	int ldCount;
	u16 ld;


	for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
		ld = MR_TargetIdToLdGet(ldCount, map);
		if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
			continue;
		raid = MR_LdRaidGet(ld, map);
		for (element = 0; element < MAX_QUAD_DEPTH; element++) {
			for (span = 0; span < raid->spanDepth; span++) {
				if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
					block_span_info.noElements) <
					element + 1)
					continue;
				span_set = &(ldSpanInfo[ld].span_set[element]);
				quad = &map->raidMap.ldSpanMap[ld].
					spanBlock[span].block_span_info.
					quad[element];

				span_set->diff = le32_to_cpu(quad->diff);

				for (count = 0, span_row_width = 0;
					count < raid->spanDepth; count++) {
					if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
						spanBlock[count].
						block_span_info.
						noElements) >= element + 1) {
						span_set->strip_offset[count] =
							span_row_width;
						span_row_width +=
							MR_LdSpanPtrGet
							(ld, count, map)->spanRowDataSize;
						printk(KERN_INFO "megasas:"
							"span %x rowDataSize %x\n",
							count, MR_LdSpanPtrGet
							(ld, count, map)->spanRowDataSize);
					}
				}

				span_set->span_row_data_width = span_row_width;
				span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
					le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
					le32_to_cpu(quad->diff));

				if (element == 0) {
					span_set->log_start_lba = 0;
					span_set->log_end_lba =
						((span_row << raid->stripeShift)
						* span_row_width) - 1;

					span_set->span_row_start = 0;
					span_set->span_row_end = span_row - 1;

					span_set->data_strip_start = 0;
					span_set->data_strip_end =
						(span_row * span_row_width) - 1;

					span_set->data_row_start = 0;
					span_set->data_row_end =
						(span_row * le32_to_cpu(quad->diff)) - 1;
				} else {
					span_set_prev = &(ldSpanInfo[ld].
							span_set[element - 1]);
					span_set->log_start_lba =
						span_set_prev->log_end_lba + 1;
					span_set->log_end_lba =
						span_set->log_start_lba +
						((span_row << raid->stripeShift)
						* span_row_width) - 1;

					span_set->span_row_start =
						span_set_prev->span_row_end + 1;
					span_set->span_row_end =
					span_set->span_row_start + span_row - 1;

					span_set->data_strip_start =
					span_set_prev->data_strip_end + 1;
					span_set->data_strip_end =
						span_set->data_strip_start +
						(span_row * span_row_width) - 1;

					span_set->data_row_start =
						span_set_prev->data_row_end + 1;
					span_set->data_row_end =
						span_set->data_row_start +
						(span_row * le32_to_cpu(quad->diff)) - 1;
				}
				break;
		}
		if (span == raid->spanDepth)
			break;
	    }
	}
#if SPAN_DEBUG
	getSpanInfo(map, ldSpanInfo);
#endif

}

void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
	struct LD_LOAD_BALANCE_INFO *lbInfo)
{
	int ldCount;
	u16 ld;
	struct MR_LD_RAID *raid;

	if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
		lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;

	for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
		ld = MR_TargetIdToLdGet(ldCount, drv_map);
		if (ld >= MAX_LOGICAL_DRIVES_EXT) {
			lbInfo[ldCount].loadBalanceFlag = 0;
			continue;
		}

		raid = MR_LdRaidGet(ld, drv_map);
		if ((raid->level != 1) ||
			(raid->ldState != MR_LD_STATE_OPTIMAL)) {
			lbInfo[ldCount].loadBalanceFlag = 0;
			continue;
		}
		lbInfo[ldCount].loadBalanceFlag = 1;
	}
}

u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
	struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
{
	struct fusion_context *fusion;
	struct MR_LD_RAID  *raid;
	struct MR_DRV_RAID_MAP_ALL *drv_map;
	u16     pend0, pend1, ld;
	u64     diff0, diff1;
	u8      bestArm, pd0, pd1, span, arm;
	u32     arRef, span_row_size;

	u64 block = io_info->ldStartBlock;
	u32 count = io_info->numBlocks;

	span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
			>> RAID_CTX_SPANARM_SPAN_SHIFT);
	arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);


	fusion = instance->ctrl_context;
	drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
	ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
	raid = MR_LdRaidGet(ld, drv_map);
	span_row_size = instance->UnevenSpanSupport ?
			SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;

	arRef = MR_LdSpanArrayGet(ld, span, drv_map);
	pd0 = MR_ArPdGet(arRef, arm, drv_map);
	pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
		(arm + 1 - span_row_size) : arm + 1, drv_map);

	/* get the pending cmds for the data and mirror arms */
	pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
	pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);

	/* Determine the disk whose head is nearer to the req. block */
	diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
	diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
	bestArm = (diff0 <= diff1 ? arm : arm ^ 1);

	if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
			(bestArm != arm && pend1 > pend0 + lb_pending_cmds))
		bestArm ^= 1;

	/* Update the last accessed block on the correct pd */
	io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
	lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
	io_info->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
#if SPAN_DEBUG
	if (arm != bestArm)
		dev_dbg(&instance->pdev->dev, "LSI Debug R1 Load balance "
			"occur - span 0x%x arm 0x%x bestArm 0x%x "
			"io_info->span_arm 0x%x\n",
			span, arm, bestArm, io_info->span_arm);
#endif
	return io_info->pd_after_lb;
}

u16 get_updated_dev_handle(struct megasas_instance *instance,
	struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
{
	u8 arm_pd;
	u16 devHandle;
	struct fusion_context *fusion;
	struct MR_DRV_RAID_MAP_ALL *drv_map;

	fusion = instance->ctrl_context;
	drv_map = fusion->ld_drv_map[(instance->map_id & 1)];

	/* get best new arm (PD ID) */
	arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info);
	devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
	atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
	return devHandle;
}