summaryrefslogtreecommitdiff
path: root/drivers/scsi/pmcraid.c
blob: bcb64eb1387f0565976449eb9a45941ec7186514 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
/*
 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
 *
 * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
 *             PMC-Sierra Inc
 *
 * Copyright (C) 2008, 2009 PMC Sierra Inc
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
 * USA
 *
 */
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/hdreg.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <asm/irq.h>
#include <asm/processor.h>
#include <linux/libata.h>
#include <linux/mutex.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsicam.h>

#include "pmcraid.h"

/*
 *   Module configuration parameters
 */
static unsigned int pmcraid_debug_log;
static unsigned int pmcraid_disable_aen;
static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
static unsigned int pmcraid_enable_msix;

/*
 * Data structures to support multiple adapters by the LLD.
 * pmcraid_adapter_count - count of configured adapters
 */
static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);

/*
 * Supporting user-level control interface through IOCTL commands.
 * pmcraid_major - major number to use
 * pmcraid_minor - minor number(s) to use
 */
static unsigned int pmcraid_major;
static struct class *pmcraid_class;
DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);

/*
 * Module parameters
 */
MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(PMCRAID_DRIVER_VERSION);

module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(log_level,
		 "Enables firmware error code logging, default :1 high-severity"
		 " errors, 2: all errors including high-severity errors,"
		 " 0: disables logging");

module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(debug,
		 "Enable driver verbose message logging. Set 1 to enable."
		 "(default: 0)");

module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(disable_aen,
		 "Disable driver aen notifications to apps. Set 1 to disable."
		 "(default: 0)");

/* chip specific constants for PMC MaxRAID controllers (same for
 * 0x5220 and 0x8010
 */
static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
	{
	 .ioastatus = 0x0,
	 .ioarrin = 0x00040,
	 .mailbox = 0x7FC30,
	 .global_intr_mask = 0x00034,
	 .ioa_host_intr = 0x0009C,
	 .ioa_host_intr_clr = 0x000A0,
	 .ioa_host_msix_intr = 0x7FC40,
	 .ioa_host_mask = 0x7FC28,
	 .ioa_host_mask_clr = 0x7FC28,
	 .host_ioa_intr = 0x00020,
	 .host_ioa_intr_clr = 0x00020,
	 .transop_timeout = 300
	 }
};

/*
 * PCI device ids supported by pmcraid driver
 */
static struct pci_device_id pmcraid_pci_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
	  0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
	},
	{}
};

MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);



/**
 * pmcraid_slave_alloc - Prepare for commands to a device
 * @scsi_dev: scsi device struct
 *
 * This function is called by mid-layer prior to sending any command to the new
 * device. Stores resource entry details of the device in scsi_device struct.
 * Queuecommand uses the resource handle and other details to fill up IOARCB
 * while sending commands to the device.
 *
 * Return value:
 *	  0 on success / -ENXIO if device does not exist
 */
static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
{
	struct pmcraid_resource_entry *temp, *res = NULL;
	struct pmcraid_instance *pinstance;
	u8 target, bus, lun;
	unsigned long lock_flags;
	int rc = -ENXIO;
	u16 fw_version;

	pinstance = shost_priv(scsi_dev->host);

	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

	/* Driver exposes VSET and GSCSI resources only; all other device types
	 * are not exposed. Resource list is synchronized using resource lock
	 * so any traversal or modifications to the list should be done inside
	 * this lock
	 */
	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
	list_for_each_entry(temp, &pinstance->used_res_q, queue) {

		/* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
		if (RES_IS_VSET(temp->cfg_entry)) {
			if (fw_version <= PMCRAID_FW_VERSION_1)
				target = temp->cfg_entry.unique_flags1;
			else
				target = temp->cfg_entry.array_id & 0xFF;

			if (target > PMCRAID_MAX_VSET_TARGETS)
				continue;
			bus = PMCRAID_VSET_BUS_ID;
			lun = 0;
		} else if (RES_IS_GSCSI(temp->cfg_entry)) {
			target = RES_TARGET(temp->cfg_entry.resource_address);
			bus = PMCRAID_PHYS_BUS_ID;
			lun = RES_LUN(temp->cfg_entry.resource_address);
		} else {
			continue;
		}

		if (bus == scsi_dev->channel &&
		    target == scsi_dev->id &&
		    lun == scsi_dev->lun) {
			res = temp;
			break;
		}
	}

	if (res) {
		res->scsi_dev = scsi_dev;
		scsi_dev->hostdata = res;
		res->change_detected = 0;
		atomic_set(&res->read_failures, 0);
		atomic_set(&res->write_failures, 0);
		rc = 0;
	}
	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
	return rc;
}

/**
 * pmcraid_slave_configure - Configures a SCSI device
 * @scsi_dev: scsi device struct
 *
 * This function is executed by SCSI mid layer just after a device is first
 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
 * timeout value (default 30s) will be over-written to a higher value (60s)
 * and max_sectors value will be over-written to 512. It also sets queue depth
 * to host->cmd_per_lun value
 *
 * Return value:
 *	  0 on success
 */
static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
{
	struct pmcraid_resource_entry *res = scsi_dev->hostdata;

	if (!res)
		return 0;

	/* LLD exposes VSETs and Enclosure devices only */
	if (RES_IS_GSCSI(res->cfg_entry) &&
	    scsi_dev->type != TYPE_ENCLOSURE)
		return -ENXIO;

	pmcraid_info("configuring %x:%x:%x:%x\n",
		     scsi_dev->host->unique_id,
		     scsi_dev->channel,
		     scsi_dev->id,
		     (u8)scsi_dev->lun);

	if (RES_IS_GSCSI(res->cfg_entry)) {
		scsi_dev->allow_restart = 1;
	} else if (RES_IS_VSET(res->cfg_entry)) {
		scsi_dev->allow_restart = 1;
		blk_queue_rq_timeout(scsi_dev->request_queue,
				     PMCRAID_VSET_IO_TIMEOUT);
		blk_queue_max_hw_sectors(scsi_dev->request_queue,
				      PMCRAID_VSET_MAX_SECTORS);
	}

	if (scsi_dev->tagged_supported &&
	    (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
		scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
		scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
					scsi_dev->host->cmd_per_lun);
	} else {
		scsi_adjust_queue_depth(scsi_dev, 0,
					scsi_dev->host->cmd_per_lun);
	}

	return 0;
}

/**
 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
 *
 * @scsi_dev: scsi device struct
 *
 * This is called by mid-layer before removing a device. Pointer assignments
 * done in pmcraid_slave_alloc will be reset to NULL here.
 *
 * Return value
 *   none
 */
static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
{
	struct pmcraid_resource_entry *res;

	res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;

	if (res)
		res->scsi_dev = NULL;

	scsi_dev->hostdata = NULL;
}

/**
 * pmcraid_change_queue_depth - Change the device's queue depth
 * @scsi_dev: scsi device struct
 * @depth: depth to set
 * @reason: calling context
 *
 * Return value
 *	actual depth set
 */
static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
				      int reason)
{
	if (reason != SCSI_QDEPTH_DEFAULT)
		return -EOPNOTSUPP;

	if (depth > PMCRAID_MAX_CMD_PER_LUN)
		depth = PMCRAID_MAX_CMD_PER_LUN;

	scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);

	return scsi_dev->queue_depth;
}

/**
 * pmcraid_change_queue_type - Change the device's queue type
 * @scsi_dev: scsi device struct
 * @tag: type of tags to use
 *
 * Return value:
 *	actual queue type set
 */
static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
{
	struct pmcraid_resource_entry *res;

	res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;

	if ((res) && scsi_dev->tagged_supported &&
	    (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
		scsi_set_tag_type(scsi_dev, tag);

		if (tag)
			scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
		else
			scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
	} else
		tag = 0;

	return tag;
}


/**
 * pmcraid_init_cmdblk - initializes a command block
 *
 * @cmd: pointer to struct pmcraid_cmd to be initialized
 * @index: if >=0 first time initialization; otherwise reinitialization
 *
 * Return Value
 *	 None
 */
void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
{
	struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
	dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;

	if (index >= 0) {
		/* first time initialization (called from  probe) */
		u32 ioasa_offset =
			offsetof(struct pmcraid_control_block, ioasa);

		cmd->index = index;
		ioarcb->response_handle = cpu_to_le32(index << 2);
		ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
		ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
		ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
	} else {
		/* re-initialization of various lengths, called once command is
		 * processed by IOA
		 */
		memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
		ioarcb->hrrq_id = 0;
		ioarcb->request_flags0 = 0;
		ioarcb->request_flags1 = 0;
		ioarcb->cmd_timeout = 0;
		ioarcb->ioarcb_bus_addr &= (~0x1FULL);
		ioarcb->ioadl_bus_addr = 0;
		ioarcb->ioadl_length = 0;
		ioarcb->data_transfer_length = 0;
		ioarcb->add_cmd_param_length = 0;
		ioarcb->add_cmd_param_offset = 0;
		cmd->ioa_cb->ioasa.ioasc = 0;
		cmd->ioa_cb->ioasa.residual_data_length = 0;
		cmd->time_left = 0;
	}

	cmd->cmd_done = NULL;
	cmd->scsi_cmd = NULL;
	cmd->release = 0;
	cmd->completion_req = 0;
	cmd->sense_buffer = 0;
	cmd->sense_buffer_dma = 0;
	cmd->dma_handle = 0;
	init_timer(&cmd->timer);
}

/**
 * pmcraid_reinit_cmdblk - reinitialize a command block
 *
 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
 *
 * Return Value
 *	 None
 */
static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
{
	pmcraid_init_cmdblk(cmd, -1);
}

/**
 * pmcraid_get_free_cmd - get a free cmd block from command block pool
 * @pinstance: adapter instance structure
 *
 * Return Value:
 *	returns pointer to cmd block or NULL if no blocks are available
 */
static struct pmcraid_cmd *pmcraid_get_free_cmd(
	struct pmcraid_instance *pinstance
)
{
	struct pmcraid_cmd *cmd = NULL;
	unsigned long lock_flags;

	/* free cmd block list is protected by free_pool_lock */
	spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);

	if (!list_empty(&pinstance->free_cmd_pool)) {
		cmd = list_entry(pinstance->free_cmd_pool.next,
				 struct pmcraid_cmd, free_list);
		list_del(&cmd->free_list);
	}
	spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);

	/* Initialize the command block before giving it the caller */
	if (cmd != NULL)
		pmcraid_reinit_cmdblk(cmd);
	return cmd;
}

/**
 * pmcraid_return_cmd - return a completed command block back into free pool
 * @cmd: pointer to the command block
 *
 * Return Value:
 *	nothing
 */
void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
	list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
	spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
}

/**
 * pmcraid_read_interrupts -  reads IOA interrupts
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return value
 *	 interrupts read from IOA
 */
static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
{
	return (pinstance->interrupt_mode) ?
		ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
		ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
}

/**
 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
 *
 * @pinstance: pointer to per adapter instance structure
 * @intrs: interrupts to disable
 *
 * Return Value
 *	 None
 */
static void pmcraid_disable_interrupts(
	struct pmcraid_instance *pinstance,
	u32 intrs
)
{
	u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
	u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;

	iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
	iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
	ioread32(pinstance->int_regs.global_interrupt_mask_reg);

	if (!pinstance->interrupt_mode) {
		iowrite32(intrs,
			pinstance->int_regs.ioa_host_interrupt_mask_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
	}
}

/**
 * pmcraid_enable_interrupts - Enables specified interrupts
 *
 * @pinstance: pointer to per adapter instance structure
 * @intr: interrupts to enable
 *
 * Return Value
 *	 None
 */
static void pmcraid_enable_interrupts(
	struct pmcraid_instance *pinstance,
	u32 intrs
)
{
	u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
	u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);

	iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);

	if (!pinstance->interrupt_mode) {
		iowrite32(~intrs,
			 pinstance->int_regs.ioa_host_interrupt_mask_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
	}

	pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
		ioread32(pinstance->int_regs.global_interrupt_mask_reg),
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
}

/**
 * pmcraid_clr_trans_op - clear trans to op interrupt
 *
 * @pinstance: pointer to per adapter instance structure
 *
 * Return Value
 *	 None
 */
static void pmcraid_clr_trans_op(
	struct pmcraid_instance *pinstance
)
{
	unsigned long lock_flags;

	if (!pinstance->interrupt_mode) {
		iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
			pinstance->int_regs.ioa_host_interrupt_mask_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
		iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
			pinstance->int_regs.ioa_host_interrupt_clr_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
	}

	if (pinstance->reset_cmd != NULL) {
		del_timer(&pinstance->reset_cmd->timer);
		spin_lock_irqsave(
			pinstance->host->host_lock, lock_flags);
		pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
		spin_unlock_irqrestore(
			pinstance->host->host_lock, lock_flags);
	}
}

/**
 * pmcraid_reset_type - Determine the required reset type
 * @pinstance: pointer to adapter instance structure
 *
 * IOA requires hard reset if any of the following conditions is true.
 * 1. If HRRQ valid interrupt is not masked
 * 2. IOA reset alert doorbell is set
 * 3. If there are any error interrupts
 */
static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
{
	u32 mask;
	u32 intrs;
	u32 alerts;

	mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
	intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
	alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);

	if ((mask & INTRS_HRRQ_VALID) == 0 ||
	    (alerts & DOORBELL_IOA_RESET_ALERT) ||
	    (intrs & PMCRAID_ERROR_INTERRUPTS)) {
		pmcraid_info("IOA requires hard reset\n");
		pinstance->ioa_hard_reset = 1;
	}

	/* If unit check is active, trigger the dump */
	if (intrs & INTRS_IOA_UNIT_CHECK)
		pinstance->ioa_unit_check = 1;
}

/**
 * pmcraid_bist_done - completion function for PCI BIST
 * @cmd: pointer to reset command
 * Return Value
 *	none
 */

static void pmcraid_ioa_reset(struct pmcraid_cmd *);

static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;
	int rc;
	u16 pci_reg;

	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);

	/* If PCI config space can't be accessed wait for another two secs */
	if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
	    cmd->time_left > 0) {
		pmcraid_info("BIST not complete, waiting another 2 secs\n");
		cmd->timer.expires = jiffies + cmd->time_left;
		cmd->time_left = 0;
		cmd->timer.data = (unsigned long)cmd;
		cmd->timer.function =
			(void (*)(unsigned long))pmcraid_bist_done;
		add_timer(&cmd->timer);
	} else {
		cmd->time_left = 0;
		pmcraid_info("BIST is complete, proceeding with reset\n");
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pmcraid_ioa_reset(cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	}
}

/**
 * pmcraid_start_bist - starts BIST
 * @cmd: pointer to reset cmd
 * Return Value
 *   none
 */
static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 doorbells, intrs;

	/* proceed with bist and wait for 2 seconds */
	iowrite32(DOORBELL_IOA_START_BIST,
		pinstance->int_regs.host_ioa_interrupt_reg);
	doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
	intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
	pmcraid_info("doorbells after start bist: %x intrs: %x\n",
		      doorbells, intrs);

	cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
	cmd->timer.data = (unsigned long)cmd;
	cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
	cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
	add_timer(&cmd->timer);
}

/**
 * pmcraid_reset_alert_done - completion routine for reset_alert
 * @cmd: pointer to command block used in reset sequence
 * Return value
 *  None
 */
static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 status = ioread32(pinstance->ioa_status);
	unsigned long lock_flags;

	/* if the critical operation in progress bit is set or the wait times
	 * out, invoke reset engine to proceed with hard reset. If there is
	 * some more time to wait, restart the timer
	 */
	if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
	    cmd->time_left <= 0) {
		pmcraid_info("critical op is reset proceeding with reset\n");
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pmcraid_ioa_reset(cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	} else {
		pmcraid_info("critical op is not yet reset waiting again\n");
		/* restart timer if some more time is available to wait */
		cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
		cmd->timer.data = (unsigned long)cmd;
		cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
		cmd->timer.function =
			(void (*)(unsigned long))pmcraid_reset_alert_done;
		add_timer(&cmd->timer);
	}
}

/**
 * pmcraid_reset_alert - alerts IOA for a possible reset
 * @cmd : command block to be used for reset sequence.
 *
 * Return Value
 *	returns 0 if pci config-space is accessible and RESET_DOORBELL is
 *	successfully written to IOA. Returns non-zero in case pci_config_space
 *	is not accessible
 */
static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 doorbells;
	int rc;
	u16 pci_reg;

	/* If we are able to access IOA PCI config space, alert IOA that we are
	 * going to reset it soon. This enables IOA to preserv persistent error
	 * data if any. In case memory space is not accessible, proceed with
	 * BIST or slot_reset
	 */
	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
	if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {

		/* wait for IOA permission i.e until CRITICAL_OPERATION bit is
		 * reset IOA doesn't generate any interrupts when CRITICAL
		 * OPERATION bit is reset. A timer is started to wait for this
		 * bit to be reset.
		 */
		cmd->time_left = PMCRAID_RESET_TIMEOUT;
		cmd->timer.data = (unsigned long)cmd;
		cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
		cmd->timer.function =
			(void (*)(unsigned long))pmcraid_reset_alert_done;
		add_timer(&cmd->timer);

		iowrite32(DOORBELL_IOA_RESET_ALERT,
			pinstance->int_regs.host_ioa_interrupt_reg);
		doorbells =
			ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
		pmcraid_info("doorbells after reset alert: %x\n", doorbells);
	} else {
		pmcraid_info("PCI config is not accessible starting BIST\n");
		pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
		pmcraid_start_bist(cmd);
	}
}

/**
 * pmcraid_timeout_handler -  Timeout handler for internally generated ops
 *
 * @cmd : pointer to command structure, that got timedout
 *
 * This function blocks host requests and initiates an adapter reset.
 *
 * Return value:
 *   None
 */
static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	dev_info(&pinstance->pdev->dev,
		"Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
		cmd->ioa_cb->ioarcb.cdb[0]);

	/* Command timeouts result in hard reset sequence. The command that got
	 * timed out may be the one used as part of reset sequence. In this
	 * case restart reset sequence using the same command block even if
	 * reset is in progress. Otherwise fail this command and get a free
	 * command block to restart the reset sequence.
	 */
	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
	if (!pinstance->ioa_reset_in_progress) {
		pinstance->ioa_reset_attempts = 0;
		cmd = pmcraid_get_free_cmd(pinstance);

		/* If we are out of command blocks, just return here itself.
		 * Some other command's timeout handler can do the reset job
		 */
		if (cmd == NULL) {
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       lock_flags);
			pmcraid_err("no free cmnd block for timeout handler\n");
			return;
		}

		pinstance->reset_cmd = cmd;
		pinstance->ioa_reset_in_progress = 1;
	} else {
		pmcraid_info("reset is already in progress\n");

		if (pinstance->reset_cmd != cmd) {
			/* This command should have been given to IOA, this
			 * command will be completed by fail_outstanding_cmds
			 * anyway
			 */
			pmcraid_err("cmd is pending but reset in progress\n");
		}

		/* If this command was being used as part of the reset
		 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
		 * causes fail_outstanding_commands not to return the command
		 * block back to free pool
		 */
		if (cmd == pinstance->reset_cmd)
			cmd->cmd_done = pmcraid_ioa_reset;
	}

	/* Notify apps of important IOA bringup/bringdown sequences */
	if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
	    pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
		pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_RESET_START);

	pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
	scsi_block_requests(pinstance->host);
	pmcraid_reset_alert(cmd);
	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
}

/**
 * pmcraid_internal_done - completion routine for internally generated cmds
 *
 * @cmd: command that got response from IOA
 *
 * Return Value:
 *	 none
 */
static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	/* Some of the internal commands are sent with callers blocking for the
	 * response. Same will be indicated as part of cmd->completion_req
	 * field. Response path needs to wake up any waiters waiting for cmd
	 * completion if this flag is set.
	 */
	if (cmd->completion_req) {
		cmd->completion_req = 0;
		complete(&cmd->wait_for_completion);
	}

	/* most of the internal commands are completed by caller itself, so
	 * no need to return the command block back to free pool until we are
	 * required to do so (e.g once done with initialization).
	 */
	if (cmd->release) {
		cmd->release = 0;
		pmcraid_return_cmd(cmd);
	}
}

/**
 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
 *
 * @cmd: command that got response from IOA
 *
 * This routine is called after driver re-reads configuration table due to a
 * lost CCN. It returns the command block back to free pool and schedules
 * worker thread to add/delete devices into the system.
 *
 * Return Value:
 *	 none
 */
static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	if (cmd->release) {
		cmd->release = 0;
		pmcraid_return_cmd(cmd);
	}
	pmcraid_info("scheduling worker for config table reinitialization\n");
	schedule_work(&cmd->drv_inst->worker_q);
}

/**
 * pmcraid_erp_done - Process completion of SCSI error response from device
 * @cmd: pmcraid_command
 *
 * This function copies the sense buffer into the scsi_cmd struct and completes
 * scsi_cmd by calling scsi_done function.
 *
 * Return value:
 *  none
 */
static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
{
	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);

	if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
		scsi_cmd->result |= (DID_ERROR << 16);
		scmd_printk(KERN_INFO, scsi_cmd,
			    "command CDB[0] = %x failed with IOASC: 0x%08X\n",
			    cmd->ioa_cb->ioarcb.cdb[0], ioasc);
	}

	/* if we had allocated sense buffers for request sense, copy the sense
	 * release the buffers
	 */
	if (cmd->sense_buffer != NULL) {
		memcpy(scsi_cmd->sense_buffer,
		       cmd->sense_buffer,
		       SCSI_SENSE_BUFFERSIZE);
		pci_free_consistent(pinstance->pdev,
				    SCSI_SENSE_BUFFERSIZE,
				    cmd->sense_buffer, cmd->sense_buffer_dma);
		cmd->sense_buffer = NULL;
		cmd->sense_buffer_dma = 0;
	}

	scsi_dma_unmap(scsi_cmd);
	pmcraid_return_cmd(cmd);
	scsi_cmd->scsi_done(scsi_cmd);
}

/**
 * pmcraid_fire_command - sends an IOA command to adapter
 *
 * This function adds the given block into pending command list
 * and returns without waiting
 *
 * @cmd : command to be sent to the device
 *
 * Return Value
 *	None
 */
static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	/* Add this command block to pending cmd pool. We do this prior to
	 * writting IOARCB to ioarrin because IOA might complete the command
	 * by the time we are about to add it to the list. Response handler
	 * (isr/tasklet) looks for cmd block in the pending pending list.
	 */
	spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
	list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
	spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
	atomic_inc(&pinstance->outstanding_cmds);

	/* driver writes lower 32-bit value of IOARCB address only */
	mb();
	iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
		  pinstance->ioarrin);
}

/**
 * pmcraid_send_cmd - fires a command to IOA
 *
 * This function also sets up timeout function, and command completion
 * function
 *
 * @cmd: pointer to the command block to be fired to IOA
 * @cmd_done: command completion function, called once IOA responds
 * @timeout: timeout to wait for this command completion
 * @timeout_func: timeout handler
 *
 * Return value
 *   none
 */
static void pmcraid_send_cmd(
	struct pmcraid_cmd *cmd,
	void (*cmd_done) (struct pmcraid_cmd *),
	unsigned long timeout,
	void (*timeout_func) (struct pmcraid_cmd *)
)
{
	/* initialize done function */
	cmd->cmd_done = cmd_done;

	if (timeout_func) {
		/* setup timeout handler */
		cmd->timer.data = (unsigned long)cmd;
		cmd->timer.expires = jiffies + timeout;
		cmd->timer.function = (void (*)(unsigned long))timeout_func;
		add_timer(&cmd->timer);
	}

	/* fire the command to IOA */
	_pmcraid_fire_command(cmd);
}

/**
 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
 * @cmd: pointer to the command block used for sending IOA shutdown command
 *
 * Return value
 *  None
 */
static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
	pmcraid_ioa_reset(cmd);
	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
}

/**
 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
 *
 * @cmd: pointer to the command block used as part of reset sequence
 *
 * Return Value
 *  None
 */
static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	/* Note that commands sent during reset require next command to be sent
	 * to IOA. Hence reinit the done function as well as timeout function
	 */
	pmcraid_reinit_cmdblk(cmd);
	cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
	cmd->ioa_cb->ioarcb.resource_handle =
		cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
	cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;

	/* fire shutdown command to hardware. */
	pmcraid_info("firing normal shutdown command (%d) to IOA\n",
		     le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));

	pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);

	pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
			 PMCRAID_SHUTDOWN_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_get_fwversion_done - completion function for get_fwversion
 *
 * @cmd: pointer to command block used to send INQUIRY command
 *
 * Return Value
 *	none
 */
static void pmcraid_querycfg(struct pmcraid_cmd *);

static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
	unsigned long lock_flags;

	/* configuration table entry size depends on firmware version. If fw
	 * version is not known, it is not possible to interpret IOA config
	 * table
	 */
	if (ioasc) {
		pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
		pmcraid_reset_alert(cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	} else  {
		pmcraid_querycfg(cmd);
	}
}

/**
 * pmcraid_get_fwversion - reads firmware version information
 *
 * @cmd: pointer to command block used to send INQUIRY command
 *
 * Return Value
 *	none
 */
static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u16 data_size = sizeof(struct pmcraid_inquiry_data);

	pmcraid_reinit_cmdblk(cmd);
	ioarcb->request_type = REQ_TYPE_SCSI;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	ioarcb->cdb[0] = INQUIRY;
	ioarcb->cdb[1] = 1;
	ioarcb->cdb[2] = 0xD0;
	ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
	ioarcb->cdb[4] = data_size & 0xFF;

	/* Since entire inquiry data it can be part of IOARCB itself
	 */
	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
	ioarcb->ioarcb_bus_addr &= ~(0x1FULL);

	ioarcb->request_flags0 |= NO_LINK_DESCS;
	ioarcb->data_transfer_length = cpu_to_le32(data_size);
	ioadl = &(ioarcb->add_data.u.ioadl[0]);
	ioadl->flags = IOADL_FLAGS_LAST_DESC;
	ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
	ioadl->data_len = cpu_to_le32(data_size);

	pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
}

/**
 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
 * @cmd: pointer to command block to be used for identify hrrq
 *
 * Return Value
 *	 none
 */
static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	int index = cmd->hrrq_index;
	__be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
	u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
	void (*done_function)(struct pmcraid_cmd *);

	pmcraid_reinit_cmdblk(cmd);
	cmd->hrrq_index = index + 1;

	if (cmd->hrrq_index < pinstance->num_hrrq) {
		done_function = pmcraid_identify_hrrq;
	} else {
		cmd->hrrq_index = 0;
		done_function = pmcraid_get_fwversion;
	}

	/* Initialize ioarcb */
	ioarcb->request_type = REQ_TYPE_IOACMD;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);

	/* initialize the hrrq number where IOA will respond to this command */
	ioarcb->hrrq_id = index;
	ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
	ioarcb->cdb[1] = index;

	/* IOA expects 64-bit pci address to be written in B.E format
	 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
	 */
	pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
		     hrrq_addr, ioarcb->ioarcb_bus_addr, index);

	memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
	memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));

	/* Subsequent commands require HRRQ identification to be successful.
	 * Note that this gets called even during reset from SCSI mid-layer
	 * or tasklet
	 */
	pmcraid_send_cmd(cmd, done_function,
			 PMCRAID_INTERNAL_TIMEOUT,
			 pmcraid_timeout_handler);
}

static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);

/**
 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
 *
 * @cmd: initialized command block pointer
 *
 * Return Value
 *   none
 */
static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
{
	if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
		atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
	else
		atomic_set(&(cmd->drv_inst->ldn.ignore), 0);

	pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
}

/**
 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
 *
 * @pinstance: pointer to adapter instance structure
 * @type: HCAM type
 *
 * Return Value
 *   pointer to initialized pmcraid_cmd structure or NULL
 */
static struct pmcraid_cmd *pmcraid_init_hcam
(
	struct pmcraid_instance *pinstance,
	u8 type
)
{
	struct pmcraid_cmd *cmd;
	struct pmcraid_ioarcb *ioarcb;
	struct pmcraid_ioadl_desc *ioadl;
	struct pmcraid_hostrcb *hcam;
	void (*cmd_done) (struct pmcraid_cmd *);
	dma_addr_t dma;
	int rcb_size;

	cmd = pmcraid_get_free_cmd(pinstance);

	if (!cmd) {
		pmcraid_err("no free command blocks for hcam\n");
		return cmd;
	}

	if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
		rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
		cmd_done = pmcraid_process_ccn;
		dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
		hcam = &pinstance->ccn;
	} else {
		rcb_size = sizeof(struct pmcraid_hcam_ldn);
		cmd_done = pmcraid_process_ldn;
		dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
		hcam = &pinstance->ldn;
	}

	/* initialize command pointer used for HCAM registration */
	hcam->cmd = cmd;

	ioarcb = &cmd->ioa_cb->ioarcb;
	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
	ioadl = ioarcb->add_data.u.ioadl;

	/* Initialize ioarcb */
	ioarcb->request_type = REQ_TYPE_HCAM;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
	ioarcb->cdb[1] = type;
	ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
	ioarcb->cdb[8] = (rcb_size) & 0xFF;

	ioarcb->data_transfer_length = cpu_to_le32(rcb_size);

	ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
	ioadl[0].data_len = cpu_to_le32(rcb_size);
	ioadl[0].address = cpu_to_le32(dma);

	cmd->cmd_done = cmd_done;
	return cmd;
}

/**
 * pmcraid_send_hcam - Send an HCAM to IOA
 * @pinstance: ioa config struct
 * @type: HCAM type
 *
 * This function will send a Host Controlled Async command to IOA.
 *
 * Return value:
 *	none
 */
static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
{
	struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
	pmcraid_send_hcam_cmd(cmd);
}


/**
 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
 *
 * @cmd: pointer to cmd that is used as cancelling command
 * @cmd_to_cancel: pointer to the command that needs to be cancelled
 */
static void pmcraid_prepare_cancel_cmd(
	struct pmcraid_cmd *cmd,
	struct pmcraid_cmd *cmd_to_cancel
)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	__be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;

	/* Get the resource handle to where the command to be aborted has been
	 * sent.
	 */
	ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
	ioarcb->request_type = REQ_TYPE_IOACMD;
	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
	ioarcb->cdb[0] = PMCRAID_ABORT_CMD;

	/* IOARCB address of the command to be cancelled is given in
	 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
	 * IOARCB address are not masked.
	 */
	ioarcb_addr = cpu_to_be64(ioarcb_addr);
	memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
}

/**
 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
 *
 * @cmd: command to be used as cancelling command
 * @type: HCAM type
 * @cmd_done: op done function for the cancelling command
 */
static void pmcraid_cancel_hcam(
	struct pmcraid_cmd *cmd,
	u8 type,
	void (*cmd_done) (struct pmcraid_cmd *)
)
{
	struct pmcraid_instance *pinstance;
	struct pmcraid_hostrcb  *hcam;

	pinstance = cmd->drv_inst;
	hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
		&pinstance->ldn : &pinstance->ccn;

	/* prepare for cancelling previous hcam command. If the HCAM is
	 * currently not pending with IOA, we would have hcam->cmd as non-null
	 */
	if (hcam->cmd == NULL)
		return;

	pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);

	/* writing to IOARRIN must be protected by host_lock, as mid-layer
	 * schedule queuecommand while we are doing this
	 */
	pmcraid_send_cmd(cmd, cmd_done,
			 PMCRAID_INTERNAL_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
 *
 * @cmd: command block to be used for cancelling the HCAM
 */
static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	pmcraid_reinit_cmdblk(cmd);

	pmcraid_cancel_hcam(cmd,
			    PMCRAID_HCAM_CODE_CONFIG_CHANGE,
			    pmcraid_ioa_shutdown);
}

/**
 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
 *
 * @cmd: command block to be used for cancelling the HCAM
 */
static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
{
	pmcraid_cancel_hcam(cmd,
			    PMCRAID_HCAM_CODE_LOG_DATA,
			    pmcraid_cancel_ccn);
}

/**
 * pmcraid_expose_resource - check if the resource can be exposed to OS
 *
 * @fw_version: firmware version code
 * @cfgte: pointer to configuration table entry of the resource
 *
 * Return value:
 *	true if resource can be added to midlayer, false(0) otherwise
 */
static int pmcraid_expose_resource(u16 fw_version,
				   struct pmcraid_config_table_entry *cfgte)
{
	int retval = 0;

	if (cfgte->resource_type == RES_TYPE_VSET) {
		if (fw_version <= PMCRAID_FW_VERSION_1)
			retval = ((cfgte->unique_flags1 & 0x80) == 0);
		else
			retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
				  (cfgte->unique_flags1 & 0x80) == 0);

	} else if (cfgte->resource_type == RES_TYPE_GSCSI)
		retval = (RES_BUS(cfgte->resource_address) !=
				PMCRAID_VIRTUAL_ENCL_BUS_ID);
	return retval;
}

/* attributes supported by pmcraid_event_family */
enum {
	PMCRAID_AEN_ATTR_UNSPEC,
	PMCRAID_AEN_ATTR_EVENT,
	__PMCRAID_AEN_ATTR_MAX,
};
#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)

/* commands supported by pmcraid_event_family */
enum {
	PMCRAID_AEN_CMD_UNSPEC,
	PMCRAID_AEN_CMD_EVENT,
	__PMCRAID_AEN_CMD_MAX,
};
#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)

static struct genl_multicast_group pmcraid_mcgrps[] = {
	{ .name = "events", /* not really used - see ID discussion below */ },
};

static struct genl_family pmcraid_event_family = {
	/*
	 * Due to prior multicast group abuse (the code having assumed that
	 * the family ID can be used as a multicast group ID) we need to
	 * statically allocate a family (and thus group) ID.
	 */
	.id = GENL_ID_PMCRAID,
	.name = "pmcraid",
	.version = 1,
	.maxattr = PMCRAID_AEN_ATTR_MAX,
	.mcgrps = pmcraid_mcgrps,
	.n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
};

/**
 * pmcraid_netlink_init - registers pmcraid_event_family
 *
 * Return value:
 *	0 if the pmcraid_event_family is successfully registered
 *	with netlink generic, non-zero otherwise
 */
static int pmcraid_netlink_init(void)
{
	int result;

	result = genl_register_family(&pmcraid_event_family);

	if (result)
		return result;

	pmcraid_info("registered NETLINK GENERIC group: %d\n",
		     pmcraid_event_family.id);

	return result;
}

/**
 * pmcraid_netlink_release - unregisters pmcraid_event_family
 *
 * Return value:
 *	none
 */
static void pmcraid_netlink_release(void)
{
	genl_unregister_family(&pmcraid_event_family);
}

/**
 * pmcraid_notify_aen - sends event msg to user space application
 * @pinstance: pointer to adapter instance structure
 * @type: HCAM type
 *
 * Return value:
 *	0 if success, error value in case of any failure.
 */
static int pmcraid_notify_aen(
	struct pmcraid_instance *pinstance,
	struct pmcraid_aen_msg  *aen_msg,
	u32    data_size
)
{
	struct sk_buff *skb;
	void *msg_header;
	u32  total_size, nla_genl_hdr_total_size;
	int result;

	aen_msg->hostno = (pinstance->host->unique_id << 16 |
			   MINOR(pinstance->cdev.dev));
	aen_msg->length = data_size;

	data_size += sizeof(*aen_msg);

	total_size = nla_total_size(data_size);
	/* Add GENL_HDR to total_size */
	nla_genl_hdr_total_size =
		(total_size + (GENL_HDRLEN +
		((struct genl_family *)&pmcraid_event_family)->hdrsize)
		 + NLMSG_HDRLEN);
	skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);


	if (!skb) {
		pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
			     total_size);
		return -ENOMEM;
	}

	/* add the genetlink message header */
	msg_header = genlmsg_put(skb, 0, 0,
				 &pmcraid_event_family, 0,
				 PMCRAID_AEN_CMD_EVENT);
	if (!msg_header) {
		pmcraid_err("failed to copy command details\n");
		nlmsg_free(skb);
		return -ENOMEM;
	}

	result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);

	if (result) {
		pmcraid_err("failed to copy AEN attribute data\n");
		nlmsg_free(skb);
		return -EINVAL;
	}

	/* send genetlink multicast message to notify appplications */
	result = genlmsg_end(skb, msg_header);

	if (result < 0) {
		pmcraid_err("genlmsg_end failed\n");
		nlmsg_free(skb);
		return result;
	}

	result = genlmsg_multicast(&pmcraid_event_family, skb,
				   0, 0, GFP_ATOMIC);

	/* If there are no listeners, genlmsg_multicast may return non-zero
	 * value.
	 */
	if (result)
		pmcraid_info("error (%x) sending aen event message\n", result);
	return result;
}

/**
 * pmcraid_notify_ccn - notifies about CCN event msg to user space
 * @pinstance: pointer adapter instance structure
 *
 * Return value:
 *	0 if success, error value in case of any failure
 */
static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
{
	return pmcraid_notify_aen(pinstance,
				pinstance->ccn.msg,
				pinstance->ccn.hcam->data_len +
				sizeof(struct pmcraid_hcam_hdr));
}

/**
 * pmcraid_notify_ldn - notifies about CCN event msg to user space
 * @pinstance: pointer adapter instance structure
 *
 * Return value:
 *	0 if success, error value in case of any failure
 */
static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
{
	return pmcraid_notify_aen(pinstance,
				pinstance->ldn.msg,
				pinstance->ldn.hcam->data_len +
				sizeof(struct pmcraid_hcam_hdr));
}

/**
 * pmcraid_notify_ioastate - sends IOA state event msg to user space
 * @pinstance: pointer adapter instance structure
 * @evt: controller state event to be sent
 *
 * Return value:
 *	0 if success, error value in case of any failure
 */
static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
{
	pinstance->scn.ioa_state = evt;
	pmcraid_notify_aen(pinstance,
			  &pinstance->scn.msg,
			  sizeof(u32));
}

/**
 * pmcraid_handle_config_change - Handle a config change from the adapter
 * @pinstance: pointer to per adapter instance structure
 *
 * Return value:
 *  none
 */

static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
{
	struct pmcraid_config_table_entry *cfg_entry;
	struct pmcraid_hcam_ccn *ccn_hcam;
	struct pmcraid_cmd *cmd;
	struct pmcraid_cmd *cfgcmd;
	struct pmcraid_resource_entry *res = NULL;
	unsigned long lock_flags;
	unsigned long host_lock_flags;
	u32 new_entry = 1;
	u32 hidden_entry = 0;
	u16 fw_version;
	int rc;

	ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
	cfg_entry = &ccn_hcam->cfg_entry;
	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

	pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
		 res: %x:%x:%x:%x\n",
		 pinstance->ccn.hcam->ilid,
		 pinstance->ccn.hcam->op_code,
		((pinstance->ccn.hcam->timestamp1) |
		((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
		 pinstance->ccn.hcam->notification_type,
		 pinstance->ccn.hcam->notification_lost,
		 pinstance->ccn.hcam->flags,
		 pinstance->host->unique_id,
		 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
		 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
			RES_BUS(cfg_entry->resource_address)),
		 RES_IS_VSET(*cfg_entry) ?
			(fw_version <= PMCRAID_FW_VERSION_1 ?
				cfg_entry->unique_flags1 :
					cfg_entry->array_id & 0xFF) :
			RES_TARGET(cfg_entry->resource_address),
		 RES_LUN(cfg_entry->resource_address));


	/* If this HCAM indicates a lost notification, read the config table */
	if (pinstance->ccn.hcam->notification_lost) {
		cfgcmd = pmcraid_get_free_cmd(pinstance);
		if (cfgcmd) {
			pmcraid_info("lost CCN, reading config table\b");
			pinstance->reinit_cfg_table = 1;
			pmcraid_querycfg(cfgcmd);
		} else {
			pmcraid_err("lost CCN, no free cmd for querycfg\n");
		}
		goto out_notify_apps;
	}

	/* If this resource is not going to be added to mid-layer, just notify
	 * applications and return. If this notification is about hiding a VSET
	 * resource, check if it was exposed already.
	 */
	if (pinstance->ccn.hcam->notification_type ==
	    NOTIFICATION_TYPE_ENTRY_CHANGED &&
	    cfg_entry->resource_type == RES_TYPE_VSET) {

		if (fw_version <= PMCRAID_FW_VERSION_1)
			hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
		else
			hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;

	} else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
		goto out_notify_apps;
	}

	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
	list_for_each_entry(res, &pinstance->used_res_q, queue) {
		rc = memcmp(&res->cfg_entry.resource_address,
			    &cfg_entry->resource_address,
			    sizeof(cfg_entry->resource_address));
		if (!rc) {
			new_entry = 0;
			break;
		}
	}

	if (new_entry) {

		if (hidden_entry) {
			spin_unlock_irqrestore(&pinstance->resource_lock,
						lock_flags);
			goto out_notify_apps;
		}

		/* If there are more number of resources than what driver can
		 * manage, do not notify the applications about the CCN. Just
		 * ignore this notifications and re-register the same HCAM
		 */
		if (list_empty(&pinstance->free_res_q)) {
			spin_unlock_irqrestore(&pinstance->resource_lock,
						lock_flags);
			pmcraid_err("too many resources attached\n");
			spin_lock_irqsave(pinstance->host->host_lock,
					  host_lock_flags);
			pmcraid_send_hcam(pinstance,
					  PMCRAID_HCAM_CODE_CONFIG_CHANGE);
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       host_lock_flags);
			return;
		}

		res = list_entry(pinstance->free_res_q.next,
				 struct pmcraid_resource_entry, queue);

		list_del(&res->queue);
		res->scsi_dev = NULL;
		res->reset_progress = 0;
		list_add_tail(&res->queue, &pinstance->used_res_q);
	}

	memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);

	if (pinstance->ccn.hcam->notification_type ==
	    NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
		if (res->scsi_dev) {
			if (fw_version <= PMCRAID_FW_VERSION_1)
				res->cfg_entry.unique_flags1 &= 0x7F;
			else
				res->cfg_entry.array_id &= 0xFF;
			res->change_detected = RES_CHANGE_DEL;
			res->cfg_entry.resource_handle =
				PMCRAID_INVALID_RES_HANDLE;
			schedule_work(&pinstance->worker_q);
		} else {
			/* This may be one of the non-exposed resources */
			list_move_tail(&res->queue, &pinstance->free_res_q);
		}
	} else if (!res->scsi_dev) {
		res->change_detected = RES_CHANGE_ADD;
		schedule_work(&pinstance->worker_q);
	}
	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);

out_notify_apps:

	/* Notify configuration changes to registered applications.*/
	if (!pmcraid_disable_aen)
		pmcraid_notify_ccn(pinstance);

	cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
	if (cmd)
		pmcraid_send_hcam_cmd(cmd);
}

/**
 * pmcraid_get_error_info - return error string for an ioasc
 * @ioasc: ioasc code
 * Return Value
 *	 none
 */
static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
{
	int i;
	for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
		if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
			return &pmcraid_ioasc_error_table[i];
	}
	return NULL;
}

/**
 * pmcraid_ioasc_logger - log IOASC information based user-settings
 * @ioasc: ioasc code
 * @cmd: pointer to command that resulted in 'ioasc'
 */
void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);

	if (error_info == NULL ||
		cmd->drv_inst->current_log_level < error_info->log_level)
		return;

	/* log the error string */
	pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
		cmd->ioa_cb->ioarcb.cdb[0],
		cmd->ioa_cb->ioarcb.resource_handle,
		le32_to_cpu(ioasc), error_info->error_string);
}

/**
 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
 *
 * @pinstance: pointer to per adapter instance structure
 *
 * Return value:
 *  none
 */
static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
{
	struct pmcraid_hcam_ldn *hcam_ldn;
	u32 ioasc;

	hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;

	pmcraid_info
		("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
		 pinstance->ldn.hcam->ilid,
		 pinstance->ldn.hcam->op_code,
		 pinstance->ldn.hcam->notification_type,
		 pinstance->ldn.hcam->notification_lost,
		 pinstance->ldn.hcam->flags,
		 pinstance->ldn.hcam->overlay_id);

	/* log only the errors, no need to log informational log entries */
	if (pinstance->ldn.hcam->notification_type !=
	    NOTIFICATION_TYPE_ERROR_LOG)
		return;

	if (pinstance->ldn.hcam->notification_lost ==
	    HOSTRCB_NOTIFICATIONS_LOST)
		dev_info(&pinstance->pdev->dev, "Error notifications lost\n");

	ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);

	if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
		ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
		dev_info(&pinstance->pdev->dev,
			"UnitAttention due to IOA Bus Reset\n");
		scsi_report_bus_reset(
			pinstance->host,
			RES_BUS(hcam_ldn->error_log.fd_ra));
	}

	return;
}

/**
 * pmcraid_process_ccn - Op done function for a CCN.
 * @cmd: pointer to command struct
 *
 * This function is the op done function for a configuration
 * change notification
 *
 * Return value:
 * none
 */
static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
	unsigned long lock_flags;

	pinstance->ccn.cmd = NULL;
	pmcraid_return_cmd(cmd);

	/* If driver initiated IOA reset happened while this hcam was pending
	 * with IOA, or IOA bringdown sequence is in progress, no need to
	 * re-register the hcam
	 */
	if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
	    atomic_read(&pinstance->ccn.ignore) == 1) {
		return;
	} else if (ioasc) {
		dev_info(&pinstance->pdev->dev,
			"Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	} else {
		pmcraid_handle_config_change(pinstance);
	}
}

/**
 * pmcraid_process_ldn - op done function for an LDN
 * @cmd: pointer to command block
 *
 * Return value
 *   none
 */
static void pmcraid_initiate_reset(struct pmcraid_instance *);
static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);

static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_hcam_ldn *ldn_hcam =
			(struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
	u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
	unsigned long lock_flags;

	/* return the command block back to freepool */
	pinstance->ldn.cmd = NULL;
	pmcraid_return_cmd(cmd);

	/* If driver initiated IOA reset happened while this hcam was pending
	 * with IOA, no need to re-register the hcam as reset engine will do it
	 * once reset sequence is complete
	 */
	if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
	    atomic_read(&pinstance->ccn.ignore) == 1) {
		return;
	} else if (!ioasc) {
		pmcraid_handle_error_log(pinstance);
		if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
			spin_lock_irqsave(pinstance->host->host_lock,
					  lock_flags);
			pmcraid_initiate_reset(pinstance);
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       lock_flags);
			return;
		}
		if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
			pinstance->timestamp_error = 1;
			pmcraid_set_timestamp(cmd);
		}
	} else {
		dev_info(&pinstance->pdev->dev,
			"Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
	}
	/* send netlink message for HCAM notification if enabled */
	if (!pmcraid_disable_aen)
		pmcraid_notify_ldn(pinstance);

	cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
	if (cmd)
		pmcraid_send_hcam_cmd(cmd);
}

/**
 * pmcraid_register_hcams - register HCAMs for CCN and LDN
 *
 * @pinstance: pointer per adapter instance structure
 *
 * Return Value
 *   none
 */
static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
{
	pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
	pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
}

/**
 * pmcraid_unregister_hcams - cancel HCAMs registered already
 * @cmd: pointer to command used as part of reset sequence
 */
static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;

	/* During IOA bringdown, HCAM gets fired and tasklet proceeds with
	 * handling hcam response though it is not necessary. In order to
	 * prevent this, set 'ignore', so that bring-down sequence doesn't
	 * re-send any more hcams
	 */
	atomic_set(&pinstance->ccn.ignore, 1);
	atomic_set(&pinstance->ldn.ignore, 1);

	/* If adapter reset was forced as part of runtime reset sequence,
	 * start the reset sequence. Reset will be triggered even in case
	 * IOA unit_check.
	 */
	if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
	     pinstance->ioa_unit_check) {
		pinstance->force_ioa_reset = 0;
		pinstance->ioa_unit_check = 0;
		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
		pmcraid_reset_alert(cmd);
		return;
	}

	/* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
	 * one after the other. So CCN cancellation will be triggered by
	 * pmcraid_cancel_ldn itself.
	 */
	pmcraid_cancel_ldn(cmd);
}

/**
 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
 * @pinstance: pointer to adapter instance structure
 * Return Value
 *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
 */
static void pmcraid_reinit_buffers(struct pmcraid_instance *);

static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
{
	u32 intrs;

	pmcraid_reinit_buffers(pinstance);
	intrs = pmcraid_read_interrupts(pinstance);

	pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);

	if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
		if (!pinstance->interrupt_mode) {
			iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
				pinstance->int_regs.
				ioa_host_interrupt_mask_reg);
			iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
				pinstance->int_regs.ioa_host_interrupt_clr_reg);
		}
		return 1;
	} else {
		return 0;
	}
}

/**
 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
 * @cmd : pointer to reset command block
 *
 * Return Value
 *	none
 */
static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 int_reg;
	u32 doorbell;

	/* There will be an interrupt when Transition to Operational bit is
	 * set so tasklet would execute next reset task. The timeout handler
	 * would re-initiate a reset
	 */
	cmd->cmd_done = pmcraid_ioa_reset;
	cmd->timer.data = (unsigned long)cmd;
	cmd->timer.expires = jiffies +
			     msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
	cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;

	if (!timer_pending(&cmd->timer))
		add_timer(&cmd->timer);

	/* Enable destructive diagnostics on IOA if it is not yet in
	 * operational state
	 */
	doorbell = DOORBELL_RUNTIME_RESET |
		   DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;

	/* Since we do RESET_ALERT and Start BIST we have to again write
	 * MSIX Doorbell to indicate the interrupt mode
	 */
	if (pinstance->interrupt_mode) {
		iowrite32(DOORBELL_INTR_MODE_MSIX,
			  pinstance->int_regs.host_ioa_interrupt_reg);
		ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
	}

	iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
	ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
	int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);

	pmcraid_info("Waiting for IOA to become operational %x:%x\n",
		     ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
		     int_reg);
}

/**
 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return Value
 *	none
 */
static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
{
	pmcraid_info("%s is not yet implemented\n", __func__);
}

/**
 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
 * @pinstance: pointer to adapter instance structure
 *
 * This function fails all outstanding ops. If they are submitted to IOA
 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
 * otherwise just completes the commands and returns the cmd blocks to free
 * pool.
 *
 * Return value:
 *	 none
 */
static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
{
	struct pmcraid_cmd *cmd, *temp;
	unsigned long lock_flags;

	/* pending command list is protected by pending_pool_lock. Its
	 * traversal must be done as within this lock
	 */
	spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
	list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
				 free_list) {
		list_del(&cmd->free_list);
		spin_unlock_irqrestore(&pinstance->pending_pool_lock,
					lock_flags);
		cmd->ioa_cb->ioasa.ioasc =
			cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
		cmd->ioa_cb->ioasa.ilid =
			cpu_to_be32(PMCRAID_DRIVER_ILID);

		/* In case the command timer is still running */
		del_timer(&cmd->timer);

		/* If this is an IO command, complete it by invoking scsi_done
		 * function. If this is one of the internal commands other
		 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
		 * complete it
		 */
		if (cmd->scsi_cmd) {

			struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
			__le32 resp = cmd->ioa_cb->ioarcb.response_handle;

			scsi_cmd->result |= DID_ERROR << 16;

			scsi_dma_unmap(scsi_cmd);
			pmcraid_return_cmd(cmd);

			pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
				     le32_to_cpu(resp) >> 2,
				     cmd->ioa_cb->ioarcb.cdb[0],
				     scsi_cmd->result);
			scsi_cmd->scsi_done(scsi_cmd);
		} else if (cmd->cmd_done == pmcraid_internal_done ||
			   cmd->cmd_done == pmcraid_erp_done) {
			cmd->cmd_done(cmd);
		} else if (cmd->cmd_done != pmcraid_ioa_reset &&
			   cmd->cmd_done != pmcraid_ioa_shutdown_done) {
			pmcraid_return_cmd(cmd);
		}

		atomic_dec(&pinstance->outstanding_cmds);
		spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
	}

	spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
}

/**
 * pmcraid_ioa_reset - Implementation of IOA reset logic
 *
 * @cmd: pointer to the cmd block to be used for entire reset process
 *
 * This function executes most of the steps required for IOA reset. This gets
 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
 * 'eh_' thread. Access to variables used for controlling the reset sequence is
 * synchronized using host lock. Various functions called during reset process
 * would make use of a single command block, pointer to which is also stored in
 * adapter instance structure.
 *
 * Return Value
 *	 None
 */
static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u8 reset_complete = 0;

	pinstance->ioa_reset_in_progress = 1;

	if (pinstance->reset_cmd != cmd) {
		pmcraid_err("reset is called with different command block\n");
		pinstance->reset_cmd = cmd;
	}

	pmcraid_info("reset_engine: state = %d, command = %p\n",
		      pinstance->ioa_state, cmd);

	switch (pinstance->ioa_state) {

	case IOA_STATE_DEAD:
		/* If IOA is offline, whatever may be the reset reason, just
		 * return. callers might be waiting on the reset wait_q, wake
		 * up them
		 */
		pmcraid_err("IOA is offline no reset is possible\n");
		reset_complete = 1;
		break;

	case IOA_STATE_IN_BRINGDOWN:
		/* we enter here, once ioa shutdown command is processed by IOA
		 * Alert IOA for a possible reset. If reset alert fails, IOA
		 * goes through hard-reset
		 */
		pmcraid_disable_interrupts(pinstance, ~0);
		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
		pmcraid_reset_alert(cmd);
		break;

	case IOA_STATE_UNKNOWN:
		/* We may be called during probe or resume. Some pre-processing
		 * is required for prior to reset
		 */
		scsi_block_requests(pinstance->host);

		/* If asked to reset while IOA was processing responses or
		 * there are any error responses then IOA may require
		 * hard-reset.
		 */
		if (pinstance->ioa_hard_reset == 0) {
			if (ioread32(pinstance->ioa_status) &
			    INTRS_TRANSITION_TO_OPERATIONAL) {
				pmcraid_info("sticky bit set, bring-up\n");
				pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
				pmcraid_reinit_cmdblk(cmd);
				pmcraid_identify_hrrq(cmd);
			} else {
				pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
				pmcraid_soft_reset(cmd);
			}
		} else {
			/* Alert IOA of a possible reset and wait for critical
			 * operation in progress bit to reset
			 */
			pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
			pmcraid_reset_alert(cmd);
		}
		break;

	case IOA_STATE_IN_RESET_ALERT:
		/* If critical operation in progress bit is reset or wait gets
		 * timed out, reset proceeds with starting BIST on the IOA.
		 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
		 * they are 3 or more, reset engine marks IOA dead and returns
		 */
		pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
		pmcraid_start_bist(cmd);
		break;

	case IOA_STATE_IN_HARD_RESET:
		pinstance->ioa_reset_attempts++;

		/* retry reset if we haven't reached maximum allowed limit */
		if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
			pinstance->ioa_reset_attempts = 0;
			pmcraid_err("IOA didn't respond marking it as dead\n");
			pinstance->ioa_state = IOA_STATE_DEAD;

			if (pinstance->ioa_bringdown)
				pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
			else
				pmcraid_notify_ioastate(pinstance,
						PMC_DEVICE_EVENT_RESET_FAILED);
			reset_complete = 1;
			break;
		}

		/* Once either bist or pci reset is done, restore PCI config
		 * space. If this fails, proceed with hard reset again
		 */
		pci_restore_state(pinstance->pdev);

		/* fail all pending commands */
		pmcraid_fail_outstanding_cmds(pinstance);

		/* check if unit check is active, if so extract dump */
		if (pinstance->ioa_unit_check) {
			pmcraid_info("unit check is active\n");
			pinstance->ioa_unit_check = 0;
			pmcraid_get_dump(pinstance);
			pinstance->ioa_reset_attempts--;
			pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
			pmcraid_reset_alert(cmd);
			break;
		}

		/* if the reset reason is to bring-down the ioa, we might be
		 * done with the reset restore pci_config_space and complete
		 * the reset
		 */
		if (pinstance->ioa_bringdown) {
			pmcraid_info("bringing down the adapter\n");
			pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
			pinstance->ioa_bringdown = 0;
			pinstance->ioa_state = IOA_STATE_UNKNOWN;
			pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
			reset_complete = 1;
		} else {
			/* bring-up IOA, so proceed with soft reset
			 * Reinitialize hrrq_buffers and their indices also
			 * enable interrupts after a pci_restore_state
			 */
			if (pmcraid_reset_enable_ioa(pinstance)) {
				pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
				pmcraid_info("bringing up the adapter\n");
				pmcraid_reinit_cmdblk(cmd);
				pmcraid_identify_hrrq(cmd);
			} else {
				pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
				pmcraid_soft_reset(cmd);
			}
		}
		break;

	case IOA_STATE_IN_SOFT_RESET:
		/* TRANSITION TO OPERATIONAL is on so start initialization
		 * sequence
		 */
		pmcraid_info("In softreset proceeding with bring-up\n");
		pinstance->ioa_state = IOA_STATE_IN_BRINGUP;

		/* Initialization commands start with HRRQ identification. From
		 * now on tasklet completes most of the commands as IOA is up
		 * and intrs are enabled
		 */
		pmcraid_identify_hrrq(cmd);
		break;

	case IOA_STATE_IN_BRINGUP:
		/* we are done with bringing up of IOA, change the ioa_state to
		 * operational and wake up any waiters
		 */
		pinstance->ioa_state = IOA_STATE_OPERATIONAL;
		reset_complete = 1;
		break;

	case IOA_STATE_OPERATIONAL:
	default:
		/* When IOA is operational and a reset is requested, check for
		 * the reset reason. If reset is to bring down IOA, unregister
		 * HCAMs and initiate shutdown; if adapter reset is forced then
		 * restart reset sequence again
		 */
		if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
		    pinstance->force_ioa_reset == 0) {
			pmcraid_notify_ioastate(pinstance,
						PMC_DEVICE_EVENT_RESET_SUCCESS);
			reset_complete = 1;
		} else {
			if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
				pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
			pmcraid_reinit_cmdblk(cmd);
			pmcraid_unregister_hcams(cmd);
		}
		break;
	}

	/* reset will be completed if ioa_state is either DEAD or UNKNOWN or
	 * OPERATIONAL. Reset all control variables used during reset, wake up
	 * any waiting threads and let the SCSI mid-layer send commands. Note
	 * that host_lock must be held before invoking scsi_report_bus_reset.
	 */
	if (reset_complete) {
		pinstance->ioa_reset_in_progress = 0;
		pinstance->ioa_reset_attempts = 0;
		pinstance->reset_cmd = NULL;
		pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
		pinstance->ioa_bringdown = 0;
		pmcraid_return_cmd(cmd);

		/* If target state is to bring up the adapter, proceed with
		 * hcam registration and resource exposure to mid-layer.
		 */
		if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
			pmcraid_register_hcams(pinstance);

		wake_up_all(&pinstance->reset_wait_q);
	}

	return;
}

/**
 * pmcraid_initiate_reset - initiates reset sequence. This is called from
 * ISR/tasklet during error interrupts including IOA unit check. If reset
 * is already in progress, it just returns, otherwise initiates IOA reset
 * to bring IOA up to operational state.
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return value
 *	 none
 */
static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
{
	struct pmcraid_cmd *cmd;

	/* If the reset is already in progress, just return, otherwise start
	 * reset sequence and return
	 */
	if (!pinstance->ioa_reset_in_progress) {
		scsi_block_requests(pinstance->host);
		cmd = pmcraid_get_free_cmd(pinstance);

		if (cmd == NULL) {
			pmcraid_err("no cmnd blocks for initiate_reset\n");
			return;
		}

		pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
		pinstance->reset_cmd = cmd;
		pinstance->force_ioa_reset = 1;
		pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_RESET_START);
		pmcraid_ioa_reset(cmd);
	}
}

/**
 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
 *			  or bringdown IOA
 * @pinstance: pointer adapter instance structure
 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
 * @target_state: expected target state after reset
 *
 * Note: This command initiates reset and waits for its completion. Hence this
 * should not be called from isr/timer/tasklet functions (timeout handlers,
 * error response handlers and interrupt handlers).
 *
 * Return Value
 *	 1 in case ioa_state is not target_state, 0 otherwise.
 */
static int pmcraid_reset_reload(
	struct pmcraid_instance *pinstance,
	u8 shutdown_type,
	u8 target_state
)
{
	struct pmcraid_cmd *reset_cmd = NULL;
	unsigned long lock_flags;
	int reset = 1;

	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);

	if (pinstance->ioa_reset_in_progress) {
		pmcraid_info("reset_reload: reset is already in progress\n");

		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

		wait_event(pinstance->reset_wait_q,
			   !pinstance->ioa_reset_in_progress);

		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);

		if (pinstance->ioa_state == IOA_STATE_DEAD) {
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       lock_flags);
			pmcraid_info("reset_reload: IOA is dead\n");
			return reset;
		} else if (pinstance->ioa_state == target_state) {
			reset = 0;
		}
	}

	if (reset) {
		pmcraid_info("reset_reload: proceeding with reset\n");
		scsi_block_requests(pinstance->host);
		reset_cmd = pmcraid_get_free_cmd(pinstance);

		if (reset_cmd == NULL) {
			pmcraid_err("no free cmnd for reset_reload\n");
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       lock_flags);
			return reset;
		}

		if (shutdown_type == SHUTDOWN_NORMAL)
			pinstance->ioa_bringdown = 1;

		pinstance->ioa_shutdown_type = shutdown_type;
		pinstance->reset_cmd = reset_cmd;
		pinstance->force_ioa_reset = reset;
		pmcraid_info("reset_reload: initiating reset\n");
		pmcraid_ioa_reset(reset_cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
		pmcraid_info("reset_reload: waiting for reset to complete\n");
		wait_event(pinstance->reset_wait_q,
			   !pinstance->ioa_reset_in_progress);

		pmcraid_info("reset_reload: reset is complete !!\n");
		scsi_unblock_requests(pinstance->host);
		if (pinstance->ioa_state == target_state)
			reset = 0;
	}

	return reset;
}

/**
 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return Value
 *	 whatever is returned from pmcraid_reset_reload
 */
static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
{
	return pmcraid_reset_reload(pinstance,
				    SHUTDOWN_NORMAL,
				    IOA_STATE_UNKNOWN);
}

/**
 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return Value
 *	 whatever is returned from pmcraid_reset_reload
 */
static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
{
	pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);

	return pmcraid_reset_reload(pinstance,
				    SHUTDOWN_NONE,
				    IOA_STATE_OPERATIONAL);
}

/**
 * pmcraid_request_sense - Send request sense to a device
 * @cmd: pmcraid command struct
 *
 * This function sends a request sense to a device as a result of a check
 * condition. This method re-uses the same command block that failed earlier.
 */
static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;

	/* allocate DMAable memory for sense buffers */
	cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
						 SCSI_SENSE_BUFFERSIZE,
						 &cmd->sense_buffer_dma);

	if (cmd->sense_buffer == NULL) {
		pmcraid_err
			("couldn't allocate sense buffer for request sense\n");
		pmcraid_erp_done(cmd);
		return;
	}

	/* re-use the command block */
	memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
	ioarcb->request_flags0 = (SYNC_COMPLETE |
				  NO_LINK_DESCS |
				  INHIBIT_UL_CHECK);
	ioarcb->request_type = REQ_TYPE_SCSI;
	ioarcb->cdb[0] = REQUEST_SENSE;
	ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;

	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));

	ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);

	ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
	ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
	ioadl->flags = IOADL_FLAGS_LAST_DESC;

	/* request sense might be called as part of error response processing
	 * which runs in tasklets context. It is possible that mid-layer might
	 * schedule queuecommand during this time, hence, writting to IOARRIN
	 * must be protect by host_lock
	 */
	pmcraid_send_cmd(cmd, pmcraid_erp_done,
			 PMCRAID_REQUEST_SENSE_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
 * @cmd: command that failed
 * @sense: true if request_sense is required after cancel all
 *
 * This function sends a cancel all to a device to clear the queue.
 */
static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
{
	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
	void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
							: pmcraid_request_sense;

	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
	ioarcb->request_flags0 = SYNC_OVERRIDE;
	ioarcb->request_type = REQ_TYPE_IOACMD;
	ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;

	if (RES_IS_GSCSI(res->cfg_entry))
		ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;

	ioarcb->ioadl_bus_addr = 0;
	ioarcb->ioadl_length = 0;
	ioarcb->data_transfer_length = 0;
	ioarcb->ioarcb_bus_addr &= (~0x1FULL);

	/* writing to IOARRIN must be protected by host_lock, as mid-layer
	 * schedule queuecommand while we are doing this
	 */
	pmcraid_send_cmd(cmd, cmd_done,
			 PMCRAID_REQUEST_SENSE_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_frame_auto_sense: frame fixed format sense information
 *
 * @cmd: pointer to failing command block
 *
 * Return value
 *  none
 */
static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
{
	u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
	struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
	struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
	u32 ioasc = le32_to_cpu(ioasa->ioasc);
	u32 failing_lba = 0;

	memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
	cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;

	if (RES_IS_VSET(res->cfg_entry) &&
	    ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
	    ioasa->u.vset.failing_lba_hi != 0) {

		sense_buf[0] = 0x72;
		sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
		sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
		sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);

		sense_buf[7] = 12;
		sense_buf[8] = 0;
		sense_buf[9] = 0x0A;
		sense_buf[10] = 0x80;

		failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);

		sense_buf[12] = (failing_lba & 0xff000000) >> 24;
		sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
		sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
		sense_buf[15] = failing_lba & 0x000000ff;

		failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);

		sense_buf[16] = (failing_lba & 0xff000000) >> 24;
		sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
		sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
		sense_buf[19] = failing_lba & 0x000000ff;
	} else {
		sense_buf[0] = 0x70;
		sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
		sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
		sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);

		if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
			if (RES_IS_VSET(res->cfg_entry))
				failing_lba =
					le32_to_cpu(ioasa->u.
						 vset.failing_lba_lo);
			sense_buf[0] |= 0x80;
			sense_buf[3] = (failing_lba >> 24) & 0xff;
			sense_buf[4] = (failing_lba >> 16) & 0xff;
			sense_buf[5] = (failing_lba >> 8) & 0xff;
			sense_buf[6] = failing_lba & 0xff;
		}

		sense_buf[7] = 6; /* additional length */
	}
}

/**
 * pmcraid_error_handler - Error response handlers for a SCSI op
 * @cmd: pointer to pmcraid_cmd that has failed
 *
 * This function determines whether or not to initiate ERP on the affected
 * device. This is called from a tasklet, which doesn't hold any locks.
 *
 * Return value:
 *	 0 it caller can complete the request, otherwise 1 where in error
 *	 handler itself completes the request and returns the command block
 *	 back to free-pool
 */
static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
{
	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
	u32 ioasc = le32_to_cpu(ioasa->ioasc);
	u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
	u32 sense_copied = 0;

	if (!res) {
		pmcraid_info("resource pointer is NULL\n");
		return 0;
	}

	/* If this was a SCSI read/write command keep count of errors */
	if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
		atomic_inc(&res->read_failures);
	else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
		atomic_inc(&res->write_failures);

	if (!RES_IS_GSCSI(res->cfg_entry) &&
		masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
		pmcraid_frame_auto_sense(cmd);
	}

	/* Log IOASC/IOASA information based on user settings */
	pmcraid_ioasc_logger(ioasc, cmd);

	switch (masked_ioasc) {

	case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
		scsi_cmd->result |= (DID_ABORT << 16);
		break;

	case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
	case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
		scsi_cmd->result |= (DID_NO_CONNECT << 16);
		break;

	case PMCRAID_IOASC_NR_SYNC_REQUIRED:
		res->sync_reqd = 1;
		scsi_cmd->result |= (DID_IMM_RETRY << 16);
		break;

	case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
		scsi_cmd->result |= (DID_PASSTHROUGH << 16);
		break;

	case PMCRAID_IOASC_UA_BUS_WAS_RESET:
	case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
		if (!res->reset_progress)
			scsi_report_bus_reset(pinstance->host,
					      scsi_cmd->device->channel);
		scsi_cmd->result |= (DID_ERROR << 16);
		break;

	case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
		scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
		res->sync_reqd = 1;

		/* if check_condition is not active return with error otherwise
		 * get/frame the sense buffer
		 */
		if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
		    SAM_STAT_CHECK_CONDITION &&
		    PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
			return 0;

		/* If we have auto sense data as part of IOASA pass it to
		 * mid-layer
		 */
		if (ioasa->auto_sense_length != 0) {
			short sense_len = ioasa->auto_sense_length;
			int data_size = min_t(u16, le16_to_cpu(sense_len),
					      SCSI_SENSE_BUFFERSIZE);

			memcpy(scsi_cmd->sense_buffer,
			       ioasa->sense_data,
			       data_size);
			sense_copied = 1;
		}

		if (RES_IS_GSCSI(res->cfg_entry))
			pmcraid_cancel_all(cmd, sense_copied);
		else if (sense_copied)
			pmcraid_erp_done(cmd);
		else
			pmcraid_request_sense(cmd);

		return 1;

	case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
		break;

	default:
		if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
			scsi_cmd->result |= (DID_ERROR << 16);
		break;
	}
	return 0;
}

/**
 * pmcraid_reset_device - device reset handler functions
 *
 * @scsi_cmd: scsi command struct
 * @modifier: reset modifier indicating the reset sequence to be performed
 *
 * This function issues a device reset to the affected device.
 * A LUN reset will be sent to the device first. If that does
 * not work, a target reset will be sent.
 *
 * Return value:
 *	SUCCESS / FAILED
 */
static int pmcraid_reset_device(
	struct scsi_cmnd *scsi_cmd,
	unsigned long timeout,
	u8 modifier
)
{
	struct pmcraid_cmd *cmd;
	struct pmcraid_instance *pinstance;
	struct pmcraid_resource_entry *res;
	struct pmcraid_ioarcb *ioarcb;
	unsigned long lock_flags;
	u32 ioasc;

	pinstance =
		(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
	res = scsi_cmd->device->hostdata;

	if (!res) {
		sdev_printk(KERN_ERR, scsi_cmd->device,
			    "reset_device: NULL resource pointer\n");
		return FAILED;
	}

	/* If adapter is currently going through reset/reload, return failed.
	 * This will force the mid-layer to call _eh_bus/host reset, which
	 * will then go to sleep and wait for the reset to complete
	 */
	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
	if (pinstance->ioa_reset_in_progress ||
	    pinstance->ioa_state == IOA_STATE_DEAD) {
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
		return FAILED;
	}

	res->reset_progress = 1;
	pmcraid_info("Resetting %s resource with addr %x\n",
		     ((modifier & RESET_DEVICE_LUN) ? "LUN" :
		     ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
		     le32_to_cpu(res->cfg_entry.resource_address));

	/* get a free cmd block */
	cmd = pmcraid_get_free_cmd(pinstance);

	if (cmd == NULL) {
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
		pmcraid_err("%s: no cmd blocks are available\n", __func__);
		return FAILED;
	}

	ioarcb = &cmd->ioa_cb->ioarcb;
	ioarcb->resource_handle = res->cfg_entry.resource_handle;
	ioarcb->request_type = REQ_TYPE_IOACMD;
	ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;

	/* Initialize reset modifier bits */
	if (modifier)
		modifier = ENABLE_RESET_MODIFIER | modifier;

	ioarcb->cdb[1] = modifier;

	init_completion(&cmd->wait_for_completion);
	cmd->completion_req = 1;

	pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
		     le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);

	pmcraid_send_cmd(cmd,
			 pmcraid_internal_done,
			 timeout,
			 pmcraid_timeout_handler);

	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

	/* RESET_DEVICE command completes after all pending IOARCBs are
	 * completed. Once this command is completed, pmcraind_internal_done
	 * will wake up the 'completion' queue.
	 */
	wait_for_completion(&cmd->wait_for_completion);

	/* complete the command here itself and return the command block
	 * to free list
	 */
	pmcraid_return_cmd(cmd);
	res->reset_progress = 0;
	ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);

	/* set the return value based on the returned ioasc */
	return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
}

/**
 * _pmcraid_io_done - helper for pmcraid_io_done function
 *
 * @cmd: pointer to pmcraid command struct
 * @reslen: residual data length to be set in the ioasa
 * @ioasc: ioasc either returned by IOA or set by driver itself.
 *
 * This function is invoked by pmcraid_io_done to complete mid-layer
 * scsi ops.
 *
 * Return value:
 *	  0 if caller is required to return it to free_pool. Returns 1 if
 *	  caller need not worry about freeing command block as error handler
 *	  will take care of that.
 */

static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
{
	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	int rc = 0;

	scsi_set_resid(scsi_cmd, reslen);

	pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
		le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
		cmd->ioa_cb->ioarcb.cdb[0],
		ioasc, scsi_cmd->result);

	if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
		rc = pmcraid_error_handler(cmd);

	if (rc == 0) {
		scsi_dma_unmap(scsi_cmd);
		scsi_cmd->scsi_done(scsi_cmd);
	}

	return rc;
}

/**
 * pmcraid_io_done - SCSI completion function
 *
 * @cmd: pointer to pmcraid command struct
 *
 * This function is invoked by tasklet/mid-layer error handler to completing
 * the SCSI ops sent from mid-layer.
 *
 * Return value
 *	  none
 */

static void pmcraid_io_done(struct pmcraid_cmd *cmd)
{
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
	u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);

	if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
		pmcraid_return_cmd(cmd);
}

/**
 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
 *
 * @cmd: command block of the command to be aborted
 *
 * Return Value:
 *	 returns pointer to command structure used as cancelling cmd
 */
static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
{
	struct pmcraid_cmd *cancel_cmd;
	struct pmcraid_instance *pinstance;
	struct pmcraid_resource_entry *res;

	pinstance = (struct pmcraid_instance *)cmd->drv_inst;
	res = cmd->scsi_cmd->device->hostdata;

	cancel_cmd = pmcraid_get_free_cmd(pinstance);

	if (cancel_cmd == NULL) {
		pmcraid_err("%s: no cmd blocks are available\n", __func__);
		return NULL;
	}

	pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);

	pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
		cmd->ioa_cb->ioarcb.cdb[0],
		cmd->ioa_cb->ioarcb.response_handle >> 2);

	init_completion(&cancel_cmd->wait_for_completion);
	cancel_cmd->completion_req = 1;

	pmcraid_info("command (%d) CDB[0] = %x for %x\n",
		le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
		cancel_cmd->ioa_cb->ioarcb.cdb[0],
		le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));

	pmcraid_send_cmd(cancel_cmd,
			 pmcraid_internal_done,
			 PMCRAID_INTERNAL_TIMEOUT,
			 pmcraid_timeout_handler);
	return cancel_cmd;
}

/**
 * pmcraid_abort_complete - Waits for ABORT TASK completion
 *
 * @cancel_cmd: command block use as cancelling command
 *
 * Return Value:
 *	 returns SUCCESS if ABORT TASK has good completion
 *	 otherwise FAILED
 */
static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
{
	struct pmcraid_resource_entry *res;
	u32 ioasc;

	wait_for_completion(&cancel_cmd->wait_for_completion);
	res = cancel_cmd->res;
	cancel_cmd->res = NULL;
	ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);

	/* If the abort task is not timed out we will get a Good completion
	 * as sense_key, otherwise we may get one the following responses
	 * due to subsequent bus reset or device reset. In case IOASC is
	 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
	 */
	if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
	    ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
		if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
			res->sync_reqd = 1;
		ioasc = 0;
	}

	/* complete the command here itself */
	pmcraid_return_cmd(cancel_cmd);
	return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
}

/**
 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
 *
 * @scsi_cmd:   scsi command struct given by mid-layer. When this is called
 *		mid-layer ensures that no other commands are queued. This
 *		never gets called under interrupt, but a separate eh thread.
 *
 * Return value:
 *	 SUCCESS / FAILED
 */
static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
{
	struct pmcraid_instance *pinstance;
	struct pmcraid_cmd *cmd;
	struct pmcraid_resource_entry *res;
	unsigned long host_lock_flags;
	unsigned long pending_lock_flags;
	struct pmcraid_cmd *cancel_cmd = NULL;
	int cmd_found = 0;
	int rc = FAILED;

	pinstance =
		(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;

	scmd_printk(KERN_INFO, scsi_cmd,
		    "I/O command timed out, aborting it.\n");

	res = scsi_cmd->device->hostdata;

	if (res == NULL)
		return rc;

	/* If we are currently going through reset/reload, return failed.
	 * This will force the mid-layer to eventually call
	 * pmcraid_eh_host_reset which will then go to sleep and wait for the
	 * reset to complete
	 */
	spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);

	if (pinstance->ioa_reset_in_progress ||
	    pinstance->ioa_state == IOA_STATE_DEAD) {
		spin_unlock_irqrestore(pinstance->host->host_lock,
				       host_lock_flags);
		return rc;
	}

	/* loop over pending cmd list to find cmd corresponding to this
	 * scsi_cmd. Note that this command might not have been completed
	 * already. locking: all pending commands are protected with
	 * pending_pool_lock.
	 */
	spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
	list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {

		if (cmd->scsi_cmd == scsi_cmd) {
			cmd_found = 1;
			break;
		}
	}

	spin_unlock_irqrestore(&pinstance->pending_pool_lock,
				pending_lock_flags);

	/* If the command to be aborted was given to IOA and still pending with
	 * it, send ABORT_TASK to abort this and wait for its completion
	 */
	if (cmd_found)
		cancel_cmd = pmcraid_abort_cmd(cmd);

	spin_unlock_irqrestore(pinstance->host->host_lock,
			       host_lock_flags);

	if (cancel_cmd) {
		cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
		rc = pmcraid_abort_complete(cancel_cmd);
	}

	return cmd_found ? rc : SUCCESS;
}

/**
 * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
 *
 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
 *
 * All these routines invokve pmcraid_reset_device with appropriate parameters.
 * Since these are called from mid-layer EH thread, no other IO will be queued
 * to the resource being reset. However, control path (IOCTL) may be active so
 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
 * takes care by locking/unlocking host_lock.
 *
 * Return value
 *	SUCCESS or FAILED
 */
static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
{
	scmd_printk(KERN_INFO, scmd,
		    "resetting device due to an I/O command timeout.\n");
	return pmcraid_reset_device(scmd,
				    PMCRAID_INTERNAL_TIMEOUT,
				    RESET_DEVICE_LUN);
}

static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
{
	scmd_printk(KERN_INFO, scmd,
		    "Doing bus reset due to an I/O command timeout.\n");
	return pmcraid_reset_device(scmd,
				    PMCRAID_RESET_BUS_TIMEOUT,
				    RESET_DEVICE_BUS);
}

static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
{
	scmd_printk(KERN_INFO, scmd,
		    "Doing target reset due to an I/O command timeout.\n");
	return pmcraid_reset_device(scmd,
				    PMCRAID_INTERNAL_TIMEOUT,
				    RESET_DEVICE_TARGET);
}

/**
 * pmcraid_eh_host_reset_handler - adapter reset handler callback
 *
 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
 *
 * Initiates adapter reset to bring it up to operational state
 *
 * Return value
 *	SUCCESS or FAILED
 */
static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
{
	unsigned long interval = 10000; /* 10 seconds interval */
	int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
	struct pmcraid_instance *pinstance =
		(struct pmcraid_instance *)(scmd->device->host->hostdata);


	/* wait for an additional 150 seconds just in case firmware could come
	 * up and if it could complete all the pending commands excluding the
	 * two HCAM (CCN and LDN).
	 */
	while (waits--) {
		if (atomic_read(&pinstance->outstanding_cmds) <=
		    PMCRAID_MAX_HCAM_CMD)
			return SUCCESS;
		msleep(interval);
	}

	dev_err(&pinstance->pdev->dev,
		"Adapter being reset due to an I/O command timeout.\n");
	return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
}

/**
 * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
 * @scsi_cmd:   scsi command struct
 *
 * Return value
 *	  number of tags or 0 if the task is not tagged
 */
static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
{
	char tag[2];
	u8 rc = 0;

	if (scsi_populate_tag_msg(scsi_cmd, tag)) {
		switch (tag[0]) {
		case MSG_SIMPLE_TAG:
			rc = TASK_TAG_SIMPLE;
			break;
		case MSG_HEAD_TAG:
			rc = TASK_TAG_QUEUE_HEAD;
			break;
		case MSG_ORDERED_TAG:
			rc = TASK_TAG_ORDERED;
			break;
		};
	}

	return rc;
}


/**
 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
 * @cmd: pmcraid command struct
 * @sgcount: count of scatter-gather elements
 *
 * Return value
 *   returns pointer pmcraid_ioadl_desc, initialized to point to internal
 *   or external IOADLs
 */
struct pmcraid_ioadl_desc *
pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
{
	struct pmcraid_ioadl_desc *ioadl;
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	int ioadl_count = 0;

	if (ioarcb->add_cmd_param_length)
		ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
	ioarcb->ioadl_length =
		sizeof(struct pmcraid_ioadl_desc) * sgcount;

	if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
		/* external ioadls start at offset 0x80 from control_block
		 * structure, re-using 24 out of 27 ioadls part of IOARCB.
		 * It is necessary to indicate to firmware that driver is
		 * using ioadls to be treated as external to IOARCB.
		 */
		ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
		ioarcb->ioadl_bus_addr =
			cpu_to_le64((cmd->ioa_cb_bus_addr) +
				offsetof(struct pmcraid_ioarcb,
					add_data.u.ioadl[3]));
		ioadl = &ioarcb->add_data.u.ioadl[3];
	} else {
		ioarcb->ioadl_bus_addr =
			cpu_to_le64((cmd->ioa_cb_bus_addr) +
				offsetof(struct pmcraid_ioarcb,
					add_data.u.ioadl[ioadl_count]));

		ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
		ioarcb->ioarcb_bus_addr |=
				DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
	}

	return ioadl;
}

/**
 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
 * @pinstance: pointer to adapter instance structure
 * @cmd: pmcraid command struct
 *
 * This function is invoked by queuecommand entry point while sending a command
 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
 *
 * Return value:
 *	0 on success or -1 on failure
 */
static int pmcraid_build_ioadl(
	struct pmcraid_instance *pinstance,
	struct pmcraid_cmd *cmd
)
{
	int i, nseg;
	struct scatterlist *sglist;

	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;

	u32 length = scsi_bufflen(scsi_cmd);

	if (!length)
		return 0;

	nseg = scsi_dma_map(scsi_cmd);

	if (nseg < 0) {
		scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
		return -1;
	} else if (nseg > PMCRAID_MAX_IOADLS) {
		scsi_dma_unmap(scsi_cmd);
		scmd_printk(KERN_ERR, scsi_cmd,
			"sg count is (%d) more than allowed!\n", nseg);
		return -1;
	}

	/* Initialize IOARCB data transfer length fields */
	if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
		ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;

	ioarcb->request_flags0 |= NO_LINK_DESCS;
	ioarcb->data_transfer_length = cpu_to_le32(length);
	ioadl = pmcraid_init_ioadls(cmd, nseg);

	/* Initialize IOADL descriptor addresses */
	scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
		ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
		ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
		ioadl[i].flags = 0;
	}
	/* setup last descriptor */
	ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;

	return 0;
}

/**
 * pmcraid_free_sglist - Frees an allocated SG buffer list
 * @sglist: scatter/gather list pointer
 *
 * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
 *
 * Return value:
 *	none
 */
static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
{
	int i;

	for (i = 0; i < sglist->num_sg; i++)
		__free_pages(sg_page(&(sglist->scatterlist[i])),
			     sglist->order);

	kfree(sglist);
}

/**
 * pmcraid_alloc_sglist - Allocates memory for a SG list
 * @buflen: buffer length
 *
 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
 * list.
 *
 * Return value
 *	pointer to sglist / NULL on failure
 */
static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
{
	struct pmcraid_sglist *sglist;
	struct scatterlist *scatterlist;
	struct page *page;
	int num_elem, i, j;
	int sg_size;
	int order;
	int bsize_elem;

	sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
	order = (sg_size > 0) ? get_order(sg_size) : 0;
	bsize_elem = PAGE_SIZE * (1 << order);

	/* Determine the actual number of sg entries needed */
	if (buflen % bsize_elem)
		num_elem = (buflen / bsize_elem) + 1;
	else
		num_elem = buflen / bsize_elem;

	/* Allocate a scatter/gather list for the DMA */
	sglist = kzalloc(sizeof(struct pmcraid_sglist) +
			 (sizeof(struct scatterlist) * (num_elem - 1)),
			 GFP_KERNEL);

	if (sglist == NULL)
		return NULL;

	scatterlist = sglist->scatterlist;
	sg_init_table(scatterlist, num_elem);
	sglist->order = order;
	sglist->num_sg = num_elem;
	sg_size = buflen;

	for (i = 0; i < num_elem; i++) {
		page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
		if (!page) {
			for (j = i - 1; j >= 0; j--)
				__free_pages(sg_page(&scatterlist[j]), order);
			kfree(sglist);
			return NULL;
		}

		sg_set_page(&scatterlist[i], page,
			sg_size < bsize_elem ? sg_size : bsize_elem, 0);
		sg_size -= bsize_elem;
	}

	return sglist;
}

/**
 * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
 * @sglist: scatter/gather list pointer
 * @buffer: buffer pointer
 * @len: buffer length
 * @direction: data transfer direction
 *
 * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
 *
 * Return value:
 * 0 on success / other on failure
 */
static int pmcraid_copy_sglist(
	struct pmcraid_sglist *sglist,
	unsigned long buffer,
	u32 len,
	int direction
)
{
	struct scatterlist *scatterlist;
	void *kaddr;
	int bsize_elem;
	int i;
	int rc = 0;

	/* Determine the actual number of bytes per element */
	bsize_elem = PAGE_SIZE * (1 << sglist->order);

	scatterlist = sglist->scatterlist;

	for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
		struct page *page = sg_page(&scatterlist[i]);

		kaddr = kmap(page);
		if (direction == DMA_TO_DEVICE)
			rc = __copy_from_user(kaddr,
					      (void *)buffer,
					      bsize_elem);
		else
			rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);

		kunmap(page);

		if (rc) {
			pmcraid_err("failed to copy user data into sg list\n");
			return -EFAULT;
		}

		scatterlist[i].length = bsize_elem;
	}

	if (len % bsize_elem) {
		struct page *page = sg_page(&scatterlist[i]);

		kaddr = kmap(page);

		if (direction == DMA_TO_DEVICE)
			rc = __copy_from_user(kaddr,
					      (void *)buffer,
					      len % bsize_elem);
		else
			rc = __copy_to_user((void *)buffer,
					    kaddr,
					    len % bsize_elem);

		kunmap(page);

		scatterlist[i].length = len % bsize_elem;
	}

	if (rc) {
		pmcraid_err("failed to copy user data into sg list\n");
		rc = -EFAULT;
	}

	return rc;
}

/**
 * pmcraid_queuecommand - Queue a mid-layer request
 * @scsi_cmd: scsi command struct
 * @done: done function
 *
 * This function queues a request generated by the mid-layer. Midlayer calls
 * this routine within host->lock. Some of the functions called by queuecommand
 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
 *
 * Return value:
 *	  0 on success
 *	  SCSI_MLQUEUE_DEVICE_BUSY if device is busy
 *	  SCSI_MLQUEUE_HOST_BUSY if host is busy
 */
static int pmcraid_queuecommand_lck(
	struct scsi_cmnd *scsi_cmd,
	void (*done) (struct scsi_cmnd *)
)
{
	struct pmcraid_instance *pinstance;
	struct pmcraid_resource_entry *res;
	struct pmcraid_ioarcb *ioarcb;
	struct pmcraid_cmd *cmd;
	u32 fw_version;
	int rc = 0;

	pinstance =
		(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
	scsi_cmd->scsi_done = done;
	res = scsi_cmd->device->hostdata;
	scsi_cmd->result = (DID_OK << 16);

	/* if adapter is marked as dead, set result to DID_NO_CONNECT complete
	 * the command
	 */
	if (pinstance->ioa_state == IOA_STATE_DEAD) {
		pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
		scsi_cmd->result = (DID_NO_CONNECT << 16);
		scsi_cmd->scsi_done(scsi_cmd);
		return 0;
	}

	/* If IOA reset is in progress, can't queue the commands */
	if (pinstance->ioa_reset_in_progress)
		return SCSI_MLQUEUE_HOST_BUSY;

	/* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
	 * the command here itself with success return
	 */
	if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
		pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
		scsi_cmd->scsi_done(scsi_cmd);
		return 0;
	}

	/* initialize the command and IOARCB to be sent to IOA */
	cmd = pmcraid_get_free_cmd(pinstance);

	if (cmd == NULL) {
		pmcraid_err("free command block is not available\n");
		return SCSI_MLQUEUE_HOST_BUSY;
	}

	cmd->scsi_cmd = scsi_cmd;
	ioarcb = &(cmd->ioa_cb->ioarcb);
	memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
	ioarcb->resource_handle = res->cfg_entry.resource_handle;
	ioarcb->request_type = REQ_TYPE_SCSI;

	/* set hrrq number where the IOA should respond to. Note that all cmds
	 * generated internally uses hrrq_id 0, exception to this is the cmd
	 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
	 * hrrq_id assigned here in queuecommand
	 */
	ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
			  pinstance->num_hrrq;
	cmd->cmd_done = pmcraid_io_done;

	if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
		if (scsi_cmd->underflow == 0)
			ioarcb->request_flags0 |= INHIBIT_UL_CHECK;

		if (res->sync_reqd) {
			ioarcb->request_flags0 |= SYNC_COMPLETE;
			res->sync_reqd = 0;
		}

		ioarcb->request_flags0 |= NO_LINK_DESCS;
		ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);

		if (RES_IS_GSCSI(res->cfg_entry))
			ioarcb->request_flags1 |= DELAY_AFTER_RESET;
	}

	rc = pmcraid_build_ioadl(pinstance, cmd);

	pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
		     le32_to_cpu(ioarcb->response_handle) >> 2,
		     scsi_cmd->cmnd[0], pinstance->host->unique_id,
		     RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
			PMCRAID_PHYS_BUS_ID,
		     RES_IS_VSET(res->cfg_entry) ?
			(fw_version <= PMCRAID_FW_VERSION_1 ?
				res->cfg_entry.unique_flags1 :
					res->cfg_entry.array_id & 0xFF) :
			RES_TARGET(res->cfg_entry.resource_address),
		     RES_LUN(res->cfg_entry.resource_address));

	if (likely(rc == 0)) {
		_pmcraid_fire_command(cmd);
	} else {
		pmcraid_err("queuecommand could not build ioadl\n");
		pmcraid_return_cmd(cmd);
		rc = SCSI_MLQUEUE_HOST_BUSY;
	}

	return rc;
}

static DEF_SCSI_QCMD(pmcraid_queuecommand)

/**
 * pmcraid_open -char node "open" entry, allowed only users with admin access
 */
static int pmcraid_chr_open(struct inode *inode, struct file *filep)
{
	struct pmcraid_instance *pinstance;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	/* Populate adapter instance * pointer for use by ioctl */
	pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
	filep->private_data = pinstance;

	return 0;
}

/**
 * pmcraid_fasync - Async notifier registration from applications
 *
 * This function adds the calling process to a driver global queue. When an
 * event occurs, SIGIO will be sent to all processes in this queue.
 */
static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
{
	struct pmcraid_instance *pinstance;
	int rc;

	pinstance = filep->private_data;
	mutex_lock(&pinstance->aen_queue_lock);
	rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
	mutex_unlock(&pinstance->aen_queue_lock);

	return rc;
}


/**
 * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
 * commands sent over IOCTL interface
 *
 * @cmd       : pointer to struct pmcraid_cmd
 * @buflen    : length of the request buffer
 * @direction : data transfer direction
 *
 * Return value
 *  0 on success, non-zero error code on failure
 */
static int pmcraid_build_passthrough_ioadls(
	struct pmcraid_cmd *cmd,
	int buflen,
	int direction
)
{
	struct pmcraid_sglist *sglist = NULL;
	struct scatterlist *sg = NULL;
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_ioadl_desc *ioadl;
	int i;

	sglist = pmcraid_alloc_sglist(buflen);

	if (!sglist) {
		pmcraid_err("can't allocate memory for passthrough SGls\n");
		return -ENOMEM;
	}

	sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
					sglist->scatterlist,
					sglist->num_sg, direction);

	if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
		dev_err(&cmd->drv_inst->pdev->dev,
			"Failed to map passthrough buffer!\n");
		pmcraid_free_sglist(sglist);
		return -EIO;
	}

	cmd->sglist = sglist;
	ioarcb->request_flags0 |= NO_LINK_DESCS;

	ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);

	/* Initialize IOADL descriptor addresses */
	for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
		ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
		ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
		ioadl[i].flags = 0;
	}

	/* setup the last descriptor */
	ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;

	return 0;
}


/**
 * pmcraid_release_passthrough_ioadls - release passthrough ioadls
 *
 * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
 * @buflen: size of the request buffer
 * @direction: data transfer direction
 *
 * Return value
 *  0 on success, non-zero error code on failure
 */
static void pmcraid_release_passthrough_ioadls(
	struct pmcraid_cmd *cmd,
	int buflen,
	int direction
)
{
	struct pmcraid_sglist *sglist = cmd->sglist;

	if (buflen > 0) {
		pci_unmap_sg(cmd->drv_inst->pdev,
			     sglist->scatterlist,
			     sglist->num_sg,
			     direction);
		pmcraid_free_sglist(sglist);
		cmd->sglist = NULL;
	}
}

/**
 * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
 *
 * @pinstance: pointer to adapter instance structure
 * @cmd: ioctl code
 * @arg: pointer to pmcraid_passthrough_buffer user buffer
 *
 * Return value
 *  0 on success, non-zero error code on failure
 */
static long pmcraid_ioctl_passthrough(
	struct pmcraid_instance *pinstance,
	unsigned int ioctl_cmd,
	unsigned int buflen,
	unsigned long arg
)
{
	struct pmcraid_passthrough_ioctl_buffer *buffer;
	struct pmcraid_ioarcb *ioarcb;
	struct pmcraid_cmd *cmd;
	struct pmcraid_cmd *cancel_cmd;
	unsigned long request_buffer;
	unsigned long request_offset;
	unsigned long lock_flags;
	void *ioasa;
	u32 ioasc;
	int request_size;
	int buffer_size;
	u8 access, direction;
	int rc = 0;

	/* If IOA reset is in progress, wait 10 secs for reset to complete */
	if (pinstance->ioa_reset_in_progress) {
		rc = wait_event_interruptible_timeout(
				pinstance->reset_wait_q,
				!pinstance->ioa_reset_in_progress,
				msecs_to_jiffies(10000));

		if (!rc)
			return -ETIMEDOUT;
		else if (rc < 0)
			return -ERESTARTSYS;
	}

	/* If adapter is not in operational state, return error */
	if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
		pmcraid_err("IOA is not operational\n");
		return -ENOTTY;
	}

	buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
	buffer = kmalloc(buffer_size, GFP_KERNEL);

	if (!buffer) {
		pmcraid_err("no memory for passthrough buffer\n");
		return -ENOMEM;
	}

	request_offset =
	    offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);

	request_buffer = arg + request_offset;

	rc = __copy_from_user(buffer,
			     (struct pmcraid_passthrough_ioctl_buffer *) arg,
			     sizeof(struct pmcraid_passthrough_ioctl_buffer));

	ioasa =
	(void *)(arg +
		offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));

	if (rc) {
		pmcraid_err("ioctl: can't copy passthrough buffer\n");
		rc = -EFAULT;
		goto out_free_buffer;
	}

	request_size = buffer->ioarcb.data_transfer_length;

	if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
		access = VERIFY_READ;
		direction = DMA_TO_DEVICE;
	} else {
		access = VERIFY_WRITE;
		direction = DMA_FROM_DEVICE;
	}

	if (request_size > 0) {
		rc = access_ok(access, arg, request_offset + request_size);

		if (!rc) {
			rc = -EFAULT;
			goto out_free_buffer;
		}
	} else if (request_size < 0) {
		rc = -EINVAL;
		goto out_free_buffer;
	}

	/* check if we have any additional command parameters */
	if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
		rc = -EINVAL;
		goto out_free_buffer;
	}

	cmd = pmcraid_get_free_cmd(pinstance);

	if (!cmd) {
		pmcraid_err("free command block is not available\n");
		rc = -ENOMEM;
		goto out_free_buffer;
	}

	cmd->scsi_cmd = NULL;
	ioarcb = &(cmd->ioa_cb->ioarcb);

	/* Copy the user-provided IOARCB stuff field by field */
	ioarcb->resource_handle = buffer->ioarcb.resource_handle;
	ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
	ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
	ioarcb->request_type = buffer->ioarcb.request_type;
	ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
	ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
	memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);

	if (buffer->ioarcb.add_cmd_param_length) {
		ioarcb->add_cmd_param_length =
			buffer->ioarcb.add_cmd_param_length;
		ioarcb->add_cmd_param_offset =
			buffer->ioarcb.add_cmd_param_offset;
		memcpy(ioarcb->add_data.u.add_cmd_params,
			buffer->ioarcb.add_data.u.add_cmd_params,
			buffer->ioarcb.add_cmd_param_length);
	}

	/* set hrrq number where the IOA should respond to. Note that all cmds
	 * generated internally uses hrrq_id 0, exception to this is the cmd
	 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
	 * hrrq_id assigned here in queuecommand
	 */
	ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
			  pinstance->num_hrrq;

	if (request_size) {
		rc = pmcraid_build_passthrough_ioadls(cmd,
						      request_size,
						      direction);
		if (rc) {
			pmcraid_err("couldn't build passthrough ioadls\n");
			goto out_free_buffer;
		}
	} else if (request_size < 0) {
		rc = -EINVAL;
		goto out_free_buffer;
	}

	/* If data is being written into the device, copy the data from user
	 * buffers
	 */
	if (direction == DMA_TO_DEVICE && request_size > 0) {
		rc = pmcraid_copy_sglist(cmd->sglist,
					 request_buffer,
					 request_size,
					 direction);
		if (rc) {
			pmcraid_err("failed to copy user buffer\n");
			goto out_free_sglist;
		}
	}

	/* passthrough ioctl is a blocking command so, put the user to sleep
	 * until timeout. Note that a timeout value of 0 means, do timeout.
	 */
	cmd->cmd_done = pmcraid_internal_done;
	init_completion(&cmd->wait_for_completion);
	cmd->completion_req = 1;

	pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
		     le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));

	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
	_pmcraid_fire_command(cmd);
	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

	/* NOTE ! Remove the below line once abort_task is implemented
	 * in firmware. This line disables ioctl command timeout handling logic
	 * similar to IO command timeout handling, making ioctl commands to wait
	 * until the command completion regardless of timeout value specified in
	 * ioarcb
	 */
	buffer->ioarcb.cmd_timeout = 0;

	/* If command timeout is specified put caller to wait till that time,
	 * otherwise it would be blocking wait. If command gets timed out, it
	 * will be aborted.
	 */
	if (buffer->ioarcb.cmd_timeout == 0) {
		wait_for_completion(&cmd->wait_for_completion);
	} else if (!wait_for_completion_timeout(
			&cmd->wait_for_completion,
			msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {

		pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
			le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
			cmd->ioa_cb->ioarcb.cdb[0]);

		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		cancel_cmd = pmcraid_abort_cmd(cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

		if (cancel_cmd) {
			wait_for_completion(&cancel_cmd->wait_for_completion);
			ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
			pmcraid_return_cmd(cancel_cmd);

			/* if abort task couldn't find the command i.e it got
			 * completed prior to aborting, return good completion.
			 * if command got aborted successfully or there was IOA
			 * reset due to abort task itself getting timedout then
			 * return -ETIMEDOUT
			 */
			if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
			    PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
				if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
					rc = -ETIMEDOUT;
				goto out_handle_response;
			}
		}

		/* no command block for abort task or abort task failed to abort
		 * the IOARCB, then wait for 150 more seconds and initiate reset
		 * sequence after timeout
		 */
		if (!wait_for_completion_timeout(
			&cmd->wait_for_completion,
			msecs_to_jiffies(150 * 1000))) {
			pmcraid_reset_bringup(cmd->drv_inst);
			rc = -ETIMEDOUT;
		}
	}

out_handle_response:
	/* copy entire IOASA buffer and return IOCTL success.
	 * If copying IOASA to user-buffer fails, return
	 * EFAULT
	 */
	if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
		sizeof(struct pmcraid_ioasa))) {
		pmcraid_err("failed to copy ioasa buffer to user\n");
		rc = -EFAULT;
	}

	/* If the data transfer was from device, copy the data onto user
	 * buffers
	 */
	else if (direction == DMA_FROM_DEVICE && request_size > 0) {
		rc = pmcraid_copy_sglist(cmd->sglist,
					 request_buffer,
					 request_size,
					 direction);
		if (rc) {
			pmcraid_err("failed to copy user buffer\n");
			rc = -EFAULT;
		}
	}

out_free_sglist:
	pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
	pmcraid_return_cmd(cmd);

out_free_buffer:
	kfree(buffer);

	return rc;
}




/**
 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
 *
 * @pinstance: pointer to adapter instance structure
 * @cmd: ioctl command passed in
 * @buflen: length of user_buffer
 * @user_buffer: user buffer pointer
 *
 * Return Value
 *   0 in case of success, otherwise appropriate error code
 */
static long pmcraid_ioctl_driver(
	struct pmcraid_instance *pinstance,
	unsigned int cmd,
	unsigned int buflen,
	void __user *user_buffer
)
{
	int rc = -ENOSYS;

	if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
		pmcraid_err("ioctl_driver: access fault in request buffer\n");
		return -EFAULT;
	}

	switch (cmd) {
	case PMCRAID_IOCTL_RESET_ADAPTER:
		pmcraid_reset_bringup(pinstance);
		rc = 0;
		break;

	default:
		break;
	}

	return rc;
}

/**
 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
 *
 * @cmd: ioctl command
 * @arg: user buffer
 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
 *
 * Return Value
 *	negetive error code if there are access issues, otherwise zero.
 *	Upon success, returns ioctl header copied out of user buffer.
 */

static int pmcraid_check_ioctl_buffer(
	int cmd,
	void __user *arg,
	struct pmcraid_ioctl_header *hdr
)
{
	int rc = 0;
	int access = VERIFY_READ;

	if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
		pmcraid_err("couldn't copy ioctl header from user buffer\n");
		return -EFAULT;
	}

	/* check for valid driver signature */
	rc = memcmp(hdr->signature,
		    PMCRAID_IOCTL_SIGNATURE,
		    sizeof(hdr->signature));
	if (rc) {
		pmcraid_err("signature verification failed\n");
		return -EINVAL;
	}

	/* check for appropriate buffer access */
	if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
		access = VERIFY_WRITE;

	rc = access_ok(access,
		       (arg + sizeof(struct pmcraid_ioctl_header)),
		       hdr->buffer_length);
	if (!rc) {
		pmcraid_err("access failed for user buffer of size %d\n",
			     hdr->buffer_length);
		return -EFAULT;
	}

	return 0;
}

/**
 *  pmcraid_ioctl - char node ioctl entry point
 */
static long pmcraid_chr_ioctl(
	struct file *filep,
	unsigned int cmd,
	unsigned long arg
)
{
	struct pmcraid_instance *pinstance = NULL;
	struct pmcraid_ioctl_header *hdr = NULL;
	int retval = -ENOTTY;

	hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);

	if (!hdr) {
		pmcraid_err("failed to allocate memory for ioctl header\n");
		return -ENOMEM;
	}

	retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);

	if (retval) {
		pmcraid_info("chr_ioctl: header check failed\n");
		kfree(hdr);
		return retval;
	}

	pinstance = filep->private_data;

	if (!pinstance) {
		pmcraid_info("adapter instance is not found\n");
		kfree(hdr);
		return -ENOTTY;
	}

	switch (_IOC_TYPE(cmd)) {

	case PMCRAID_PASSTHROUGH_IOCTL:
		/* If ioctl code is to download microcode, we need to block
		 * mid-layer requests.
		 */
		if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
			scsi_block_requests(pinstance->host);

		retval = pmcraid_ioctl_passthrough(pinstance,
						   cmd,
						   hdr->buffer_length,
						   arg);

		if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
			scsi_unblock_requests(pinstance->host);
		break;

	case PMCRAID_DRIVER_IOCTL:
		arg += sizeof(struct pmcraid_ioctl_header);
		retval = pmcraid_ioctl_driver(pinstance,
					      cmd,
					      hdr->buffer_length,
					      (void __user *)arg);
		break;

	default:
		retval = -ENOTTY;
		break;
	}

	kfree(hdr);

	return retval;
}

/**
 * File operations structure for management interface
 */
static const struct file_operations pmcraid_fops = {
	.owner = THIS_MODULE,
	.open = pmcraid_chr_open,
	.fasync = pmcraid_chr_fasync,
	.unlocked_ioctl = pmcraid_chr_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = pmcraid_chr_ioctl,
#endif
	.llseek = noop_llseek,
};




/**
 * pmcraid_show_log_level - Display adapter's error logging level
 * @dev: class device struct
 * @buf: buffer
 *
 * Return value:
 *  number of bytes printed to buffer
 */
static ssize_t pmcraid_show_log_level(
	struct device *dev,
	struct device_attribute *attr,
	char *buf)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct pmcraid_instance *pinstance =
		(struct pmcraid_instance *)shost->hostdata;
	return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
}

/**
 * pmcraid_store_log_level - Change the adapter's error logging level
 * @dev: class device struct
 * @buf: buffer
 * @count: not used
 *
 * Return value:
 *  number of bytes printed to buffer
 */
static ssize_t pmcraid_store_log_level(
	struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count
)
{
	struct Scsi_Host *shost;
	struct pmcraid_instance *pinstance;
	u8 val;

	if (kstrtou8(buf, 10, &val))
		return -EINVAL;
	/* log-level should be from 0 to 2 */
	if (val > 2)
		return -EINVAL;

	shost = class_to_shost(dev);
	pinstance = (struct pmcraid_instance *)shost->hostdata;
	pinstance->current_log_level = val;

	return strlen(buf);
}

static struct device_attribute pmcraid_log_level_attr = {
	.attr = {
		 .name = "log_level",
		 .mode = S_IRUGO | S_IWUSR,
		 },
	.show = pmcraid_show_log_level,
	.store = pmcraid_store_log_level,
};

/**
 * pmcraid_show_drv_version - Display driver version
 * @dev: class device struct
 * @buf: buffer
 *
 * Return value:
 *  number of bytes printed to buffer
 */
static ssize_t pmcraid_show_drv_version(
	struct device *dev,
	struct device_attribute *attr,
	char *buf
)
{
	return snprintf(buf, PAGE_SIZE, "version: %s\n",
			PMCRAID_DRIVER_VERSION);
}

static struct device_attribute pmcraid_driver_version_attr = {
	.attr = {
		 .name = "drv_version",
		 .mode = S_IRUGO,
		 },
	.show = pmcraid_show_drv_version,
};

/**
 * pmcraid_show_io_adapter_id - Display driver assigned adapter id
 * @dev: class device struct
 * @buf: buffer
 *
 * Return value:
 *  number of bytes printed to buffer
 */
static ssize_t pmcraid_show_adapter_id(
	struct device *dev,
	struct device_attribute *attr,
	char *buf
)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct pmcraid_instance *pinstance =
		(struct pmcraid_instance *)shost->hostdata;
	u32 adapter_id = (pinstance->pdev->bus->number << 8) |
		pinstance->pdev->devfn;
	u32 aen_group = pmcraid_event_family.id;

	return snprintf(buf, PAGE_SIZE,
			"adapter id: %d\nminor: %d\naen group: %d\n",
			adapter_id, MINOR(pinstance->cdev.dev), aen_group);
}

static struct device_attribute pmcraid_adapter_id_attr = {
	.attr = {
		 .name = "adapter_id",
		 .mode = S_IRUGO | S_IWUSR,
		 },
	.show = pmcraid_show_adapter_id,
};

static struct device_attribute *pmcraid_host_attrs[] = {
	&pmcraid_log_level_attr,
	&pmcraid_driver_version_attr,
	&pmcraid_adapter_id_attr,
	NULL,
};


/* host template structure for pmcraid driver */
static struct scsi_host_template pmcraid_host_template = {
	.module = THIS_MODULE,
	.name = PMCRAID_DRIVER_NAME,
	.queuecommand = pmcraid_queuecommand,
	.eh_abort_handler = pmcraid_eh_abort_handler,
	.eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
	.eh_target_reset_handler = pmcraid_eh_target_reset_handler,
	.eh_device_reset_handler = pmcraid_eh_device_reset_handler,
	.eh_host_reset_handler = pmcraid_eh_host_reset_handler,

	.slave_alloc = pmcraid_slave_alloc,
	.slave_configure = pmcraid_slave_configure,
	.slave_destroy = pmcraid_slave_destroy,
	.change_queue_depth = pmcraid_change_queue_depth,
	.change_queue_type  = pmcraid_change_queue_type,
	.can_queue = PMCRAID_MAX_IO_CMD,
	.this_id = -1,
	.sg_tablesize = PMCRAID_MAX_IOADLS,
	.max_sectors = PMCRAID_IOA_MAX_SECTORS,
	.no_write_same = 1,
	.cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
	.use_clustering = ENABLE_CLUSTERING,
	.shost_attrs = pmcraid_host_attrs,
	.proc_name = PMCRAID_DRIVER_NAME
};

/*
 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
 * @irq: interrupt vector number
 * @dev_id: pointer hrrq_vector
 *
 * Return Value
 *	 IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
 */

static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
{
	struct pmcraid_isr_param *hrrq_vector;
	struct pmcraid_instance *pinstance;
	unsigned long lock_flags;
	u32 intrs_val;
	int hrrq_id;

	hrrq_vector = (struct pmcraid_isr_param *)dev_id;
	hrrq_id = hrrq_vector->hrrq_id;
	pinstance = hrrq_vector->drv_inst;

	if (!hrrq_id) {
		/* Read the interrupt */
		intrs_val = pmcraid_read_interrupts(pinstance);
		if (intrs_val &&
			((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
			& DOORBELL_INTR_MSIX_CLR) == 0)) {
			/* Any error interrupts including unit_check,
			 * initiate IOA reset.In case of unit check indicate
			 * to reset_sequence that IOA unit checked and prepare
			 * for a dump during reset sequence
			 */
			if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
				if (intrs_val & INTRS_IOA_UNIT_CHECK)
					pinstance->ioa_unit_check = 1;

				pmcraid_err("ISR: error interrupts: %x \
					initiating reset\n", intrs_val);
				spin_lock_irqsave(pinstance->host->host_lock,
					lock_flags);
				pmcraid_initiate_reset(pinstance);
				spin_unlock_irqrestore(
					pinstance->host->host_lock,
					lock_flags);
			}
			/* If interrupt was as part of the ioa initialization,
			 * clear it. Delete the timer and wakeup the
			 * reset engine to proceed with reset sequence
			 */
			if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
				pmcraid_clr_trans_op(pinstance);

			/* Clear the interrupt register by writing
			 * to host to ioa doorbell. Once done
			 * FW will clear the interrupt.
			 */
			iowrite32(DOORBELL_INTR_MSIX_CLR,
				pinstance->int_regs.host_ioa_interrupt_reg);
			ioread32(pinstance->int_regs.host_ioa_interrupt_reg);


		}
	}

	tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));

	return IRQ_HANDLED;
}

/**
 * pmcraid_isr  - implements legacy interrupt handling routine
 *
 * @irq: interrupt vector number
 * @dev_id: pointer hrrq_vector
 *
 * Return Value
 *	 IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
 */
static irqreturn_t pmcraid_isr(int irq, void *dev_id)
{
	struct pmcraid_isr_param *hrrq_vector;
	struct pmcraid_instance *pinstance;
	u32 intrs;
	unsigned long lock_flags;
	int hrrq_id = 0;

	/* In case of legacy interrupt mode where interrupts are shared across
	 * isrs, it may be possible that the current interrupt is not from IOA
	 */
	if (!dev_id) {
		printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
		return IRQ_NONE;
	}
	hrrq_vector = (struct pmcraid_isr_param *)dev_id;
	pinstance = hrrq_vector->drv_inst;

	intrs = pmcraid_read_interrupts(pinstance);

	if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
		return IRQ_NONE;

	/* Any error interrupts including unit_check, initiate IOA reset.
	 * In case of unit check indicate to reset_sequence that IOA unit
	 * checked and prepare for a dump during reset sequence
	 */
	if (intrs & PMCRAID_ERROR_INTERRUPTS) {

		if (intrs & INTRS_IOA_UNIT_CHECK)
			pinstance->ioa_unit_check = 1;

		iowrite32(intrs,
			  pinstance->int_regs.ioa_host_interrupt_clr_reg);
		pmcraid_err("ISR: error interrupts: %x initiating reset\n",
			    intrs);
		intrs = ioread32(
				pinstance->int_regs.ioa_host_interrupt_clr_reg);
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pmcraid_initiate_reset(pinstance);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	} else {
		/* If interrupt was as part of the ioa initialization,
		 * clear. Delete the timer and wakeup the
		 * reset engine to proceed with reset sequence
		 */
		if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
			pmcraid_clr_trans_op(pinstance);
		} else {
			iowrite32(intrs,
				pinstance->int_regs.ioa_host_interrupt_clr_reg);
			ioread32(
				pinstance->int_regs.ioa_host_interrupt_clr_reg);

			tasklet_schedule(
					&(pinstance->isr_tasklet[hrrq_id]));
		}
	}

	return IRQ_HANDLED;
}


/**
 * pmcraid_worker_function -  worker thread function
 *
 * @workp: pointer to struct work queue
 *
 * Return Value
 *	 None
 */

static void pmcraid_worker_function(struct work_struct *workp)
{
	struct pmcraid_instance *pinstance;
	struct pmcraid_resource_entry *res;
	struct pmcraid_resource_entry *temp;
	struct scsi_device *sdev;
	unsigned long lock_flags;
	unsigned long host_lock_flags;
	u16 fw_version;
	u8 bus, target, lun;

	pinstance = container_of(workp, struct pmcraid_instance, worker_q);
	/* add resources only after host is added into system */
	if (!atomic_read(&pinstance->expose_resources))
		return;

	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
	list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {

		if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
			sdev = res->scsi_dev;

			/* host_lock must be held before calling
			 * scsi_device_get
			 */
			spin_lock_irqsave(pinstance->host->host_lock,
					  host_lock_flags);
			if (!scsi_device_get(sdev)) {
				spin_unlock_irqrestore(
						pinstance->host->host_lock,
						host_lock_flags);
				pmcraid_info("deleting %x from midlayer\n",
					     res->cfg_entry.resource_address);
				list_move_tail(&res->queue,
						&pinstance->free_res_q);
				spin_unlock_irqrestore(
					&pinstance->resource_lock,
					lock_flags);
				scsi_remove_device(sdev);
				scsi_device_put(sdev);
				spin_lock_irqsave(&pinstance->resource_lock,
						   lock_flags);
				res->change_detected = 0;
			} else {
				spin_unlock_irqrestore(
						pinstance->host->host_lock,
						host_lock_flags);
			}
		}
	}

	list_for_each_entry(res, &pinstance->used_res_q, queue) {

		if (res->change_detected == RES_CHANGE_ADD) {

			if (!pmcraid_expose_resource(fw_version,
						     &res->cfg_entry))
				continue;

			if (RES_IS_VSET(res->cfg_entry)) {
				bus = PMCRAID_VSET_BUS_ID;
				if (fw_version <= PMCRAID_FW_VERSION_1)
					target = res->cfg_entry.unique_flags1;
				else
					target = res->cfg_entry.array_id & 0xFF;
				lun = PMCRAID_VSET_LUN_ID;
			} else {
				bus = PMCRAID_PHYS_BUS_ID;
				target =
				     RES_TARGET(
					res->cfg_entry.resource_address);
				lun = RES_LUN(res->cfg_entry.resource_address);
			}

			res->change_detected = 0;
			spin_unlock_irqrestore(&pinstance->resource_lock,
						lock_flags);
			scsi_add_device(pinstance->host, bus, target, lun);
			spin_lock_irqsave(&pinstance->resource_lock,
					   lock_flags);
		}
	}

	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
}

/**
 * pmcraid_tasklet_function - Tasklet function
 *
 * @instance: pointer to msix param structure
 *
 * Return Value
 *	None
 */
static void pmcraid_tasklet_function(unsigned long instance)
{
	struct pmcraid_isr_param *hrrq_vector;
	struct pmcraid_instance *pinstance;
	unsigned long hrrq_lock_flags;
	unsigned long pending_lock_flags;
	unsigned long host_lock_flags;
	spinlock_t *lockp; /* hrrq buffer lock */
	int id;
	__le32 resp;

	hrrq_vector = (struct pmcraid_isr_param *)instance;
	pinstance = hrrq_vector->drv_inst;
	id = hrrq_vector->hrrq_id;
	lockp = &(pinstance->hrrq_lock[id]);

	/* loop through each of the commands responded by IOA. Each HRRQ buf is
	 * protected by its own lock. Traversals must be done within this lock
	 * as there may be multiple tasklets running on multiple CPUs. Note
	 * that the lock is held just for picking up the response handle and
	 * manipulating hrrq_curr/toggle_bit values.
	 */
	spin_lock_irqsave(lockp, hrrq_lock_flags);

	resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));

	while ((resp & HRRQ_TOGGLE_BIT) ==
		pinstance->host_toggle_bit[id]) {

		int cmd_index = resp >> 2;
		struct pmcraid_cmd *cmd = NULL;

		if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
			pinstance->hrrq_curr[id]++;
		} else {
			pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
			pinstance->host_toggle_bit[id] ^= 1u;
		}

		if (cmd_index >= PMCRAID_MAX_CMD) {
			/* In case of invalid response handle, log message */
			pmcraid_err("Invalid response handle %d\n", cmd_index);
			resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
			continue;
		}

		cmd = pinstance->cmd_list[cmd_index];
		spin_unlock_irqrestore(lockp, hrrq_lock_flags);

		spin_lock_irqsave(&pinstance->pending_pool_lock,
				   pending_lock_flags);
		list_del(&cmd->free_list);
		spin_unlock_irqrestore(&pinstance->pending_pool_lock,
					pending_lock_flags);
		del_timer(&cmd->timer);
		atomic_dec(&pinstance->outstanding_cmds);

		if (cmd->cmd_done == pmcraid_ioa_reset) {
			spin_lock_irqsave(pinstance->host->host_lock,
					  host_lock_flags);
			cmd->cmd_done(cmd);
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       host_lock_flags);
		} else if (cmd->cmd_done != NULL) {
			cmd->cmd_done(cmd);
		}
		/* loop over until we are done with all responses */
		spin_lock_irqsave(lockp, hrrq_lock_flags);
		resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
	}

	spin_unlock_irqrestore(lockp, hrrq_lock_flags);
}

/**
 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
 * @pinstance: pointer to adapter instance structure
 *
 * This routine un-registers registered interrupt handler and
 * also frees irqs/vectors.
 *
 * Retun Value
 *	None
 */
static
void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
{
	int i;

	for (i = 0; i < pinstance->num_hrrq; i++)
		free_irq(pinstance->hrrq_vector[i].vector,
			 &(pinstance->hrrq_vector[i]));

	if (pinstance->interrupt_mode) {
		pci_disable_msix(pinstance->pdev);
		pinstance->interrupt_mode = 0;
	}
}

/**
 * pmcraid_register_interrupt_handler - registers interrupt handler
 * @pinstance: pointer to per-adapter instance structure
 *
 * Return Value
 *	0 on success, non-zero error code otherwise.
 */
static int
pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
{
	int rc;
	struct pci_dev *pdev = pinstance->pdev;

	if ((pmcraid_enable_msix) &&
		(pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
		int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
		struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
		int i;
		for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
			entries[i].entry = i;

		num_hrrq = pci_enable_msix_range(pdev, entries, 1, num_hrrq);
		if (num_hrrq < 0)
			goto pmcraid_isr_legacy;

		for (i = 0; i < num_hrrq; i++) {
			pinstance->hrrq_vector[i].hrrq_id = i;
			pinstance->hrrq_vector[i].drv_inst = pinstance;
			pinstance->hrrq_vector[i].vector = entries[i].vector;
			rc = request_irq(pinstance->hrrq_vector[i].vector,
					pmcraid_isr_msix, 0,
					PMCRAID_DRIVER_NAME,
					&(pinstance->hrrq_vector[i]));

			if (rc) {
				int j;
				for (j = 0; j < i; j++)
					free_irq(entries[j].vector,
						 &(pinstance->hrrq_vector[j]));
				pci_disable_msix(pdev);
				goto pmcraid_isr_legacy;
			}
		}

		pinstance->num_hrrq = num_hrrq;
		pinstance->interrupt_mode = 1;
		iowrite32(DOORBELL_INTR_MODE_MSIX,
			  pinstance->int_regs.host_ioa_interrupt_reg);
		ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
		goto pmcraid_isr_out;
	}

pmcraid_isr_legacy:
	/* If MSI-X registration failed fallback to legacy mode, where
	 * only one hrrq entry will be used
	 */
	pinstance->hrrq_vector[0].hrrq_id = 0;
	pinstance->hrrq_vector[0].drv_inst = pinstance;
	pinstance->hrrq_vector[0].vector = pdev->irq;
	pinstance->num_hrrq = 1;

	rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
			 PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
pmcraid_isr_out:
	return rc;
}

/**
 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
 * @pinstance: per adapter instance structure pointer
 * @max_index: number of buffer blocks to release
 *
 * Return Value
 *  None
 */
static void
pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
{
	int i;
	for (i = 0; i < max_index; i++) {
		kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
		pinstance->cmd_list[i] = NULL;
	}
	kmem_cache_destroy(pinstance->cmd_cachep);
	pinstance->cmd_cachep = NULL;
}

/**
 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
 * @pinstance: pointer to per adapter instance structure
 * @max_index: number of buffers (from 0 onwards) to release
 *
 * This function assumes that the command blocks for which control blocks are
 * linked are not released.
 *
 * Return Value
 *	 None
 */
static void
pmcraid_release_control_blocks(
	struct pmcraid_instance *pinstance,
	int max_index
)
{
	int i;

	if (pinstance->control_pool == NULL)
		return;

	for (i = 0; i < max_index; i++) {
		pci_pool_free(pinstance->control_pool,
			      pinstance->cmd_list[i]->ioa_cb,
			      pinstance->cmd_list[i]->ioa_cb_bus_addr);
		pinstance->cmd_list[i]->ioa_cb = NULL;
		pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
	}
	pci_pool_destroy(pinstance->control_pool);
	pinstance->control_pool = NULL;
}

/**
 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
 * @pinstance - pointer to per adapter instance structure
 *
 * Allocates memory for command blocks using kernel slab allocator.
 *
 * Return Value
 *	0 in case of success; -ENOMEM in case of failure
 */
static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
{
	int i;

	sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
		pinstance->host->unique_id);


	pinstance->cmd_cachep = kmem_cache_create(
					pinstance->cmd_pool_name,
					sizeof(struct pmcraid_cmd), 0,
					SLAB_HWCACHE_ALIGN, NULL);
	if (!pinstance->cmd_cachep)
		return -ENOMEM;

	for (i = 0; i < PMCRAID_MAX_CMD; i++) {
		pinstance->cmd_list[i] =
			kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
		if (!pinstance->cmd_list[i]) {
			pmcraid_release_cmd_blocks(pinstance, i);
			return -ENOMEM;
		}
	}
	return 0;
}

/**
 * pmcraid_allocate_control_blocks - allocates memory control blocks
 * @pinstance : pointer to per adapter instance structure
 *
 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
 * and IOASAs. This is called after command blocks are already allocated.
 *
 * Return Value
 *  0 in case it can allocate all control blocks, otherwise -ENOMEM
 */
static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
{
	int i;

	sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
		pinstance->host->unique_id);

	pinstance->control_pool =
		pci_pool_create(pinstance->ctl_pool_name,
				pinstance->pdev,
				sizeof(struct pmcraid_control_block),
				PMCRAID_IOARCB_ALIGNMENT, 0);

	if (!pinstance->control_pool)
		return -ENOMEM;

	for (i = 0; i < PMCRAID_MAX_CMD; i++) {
		pinstance->cmd_list[i]->ioa_cb =
			pci_pool_alloc(
				pinstance->control_pool,
				GFP_KERNEL,
				&(pinstance->cmd_list[i]->ioa_cb_bus_addr));

		if (!pinstance->cmd_list[i]->ioa_cb) {
			pmcraid_release_control_blocks(pinstance, i);
			return -ENOMEM;
		}
		memset(pinstance->cmd_list[i]->ioa_cb, 0,
			sizeof(struct pmcraid_control_block));
	}
	return 0;
}

/**
 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
 * @pinstance: pointer to per adapter instance structure
 * @maxindex: size of hrrq buffer pointer array
 *
 * Return Value
 *	None
 */
static void
pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
{
	int i;
	for (i = 0; i < maxindex; i++) {

		pci_free_consistent(pinstance->pdev,
				    HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
				    pinstance->hrrq_start[i],
				    pinstance->hrrq_start_bus_addr[i]);

		/* reset pointers and toggle bit to zeros */
		pinstance->hrrq_start[i] = NULL;
		pinstance->hrrq_start_bus_addr[i] = 0;
		pinstance->host_toggle_bit[i] = 0;
	}
}

/**
 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
 * @pinstance: pointer to per adapter instance structure
 *
 * Return value
 *	0 hrrq buffers are allocated, -ENOMEM otherwise.
 */
static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
{
	int i, buffer_size;

	buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;

	for (i = 0; i < pinstance->num_hrrq; i++) {
		pinstance->hrrq_start[i] =
			pci_alloc_consistent(
					pinstance->pdev,
					buffer_size,
					&(pinstance->hrrq_start_bus_addr[i]));

		if (pinstance->hrrq_start[i] == 0) {
			pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
				    i);
			pmcraid_release_host_rrqs(pinstance, i);
			return -ENOMEM;
		}

		memset(pinstance->hrrq_start[i], 0, buffer_size);
		pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
		pinstance->hrrq_end[i] =
			pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
		pinstance->host_toggle_bit[i] = 1;
		spin_lock_init(&pinstance->hrrq_lock[i]);
	}
	return 0;
}

/**
 * pmcraid_release_hcams - release HCAM buffers
 *
 * @pinstance: pointer to per adapter instance structure
 *
 * Return value
 *  none
 */
static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
{
	if (pinstance->ccn.msg != NULL) {
		pci_free_consistent(pinstance->pdev,
				    PMCRAID_AEN_HDR_SIZE +
				    sizeof(struct pmcraid_hcam_ccn_ext),
				    pinstance->ccn.msg,
				    pinstance->ccn.baddr);

		pinstance->ccn.msg = NULL;
		pinstance->ccn.hcam = NULL;
		pinstance->ccn.baddr = 0;
	}

	if (pinstance->ldn.msg != NULL) {
		pci_free_consistent(pinstance->pdev,
				    PMCRAID_AEN_HDR_SIZE +
				    sizeof(struct pmcraid_hcam_ldn),
				    pinstance->ldn.msg,
				    pinstance->ldn.baddr);

		pinstance->ldn.msg = NULL;
		pinstance->ldn.hcam = NULL;
		pinstance->ldn.baddr = 0;
	}
}

/**
 * pmcraid_allocate_hcams - allocates HCAM buffers
 * @pinstance : pointer to per adapter instance structure
 *
 * Return Value:
 *   0 in case of successful allocation, non-zero otherwise
 */
static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
{
	pinstance->ccn.msg = pci_alloc_consistent(
					pinstance->pdev,
					PMCRAID_AEN_HDR_SIZE +
					sizeof(struct pmcraid_hcam_ccn_ext),
					&(pinstance->ccn.baddr));

	pinstance->ldn.msg = pci_alloc_consistent(
					pinstance->pdev,
					PMCRAID_AEN_HDR_SIZE +
					sizeof(struct pmcraid_hcam_ldn),
					&(pinstance->ldn.baddr));

	if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
		pmcraid_release_hcams(pinstance);
	} else {
		pinstance->ccn.hcam =
			(void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
		pinstance->ldn.hcam =
			(void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;

		atomic_set(&pinstance->ccn.ignore, 0);
		atomic_set(&pinstance->ldn.ignore, 0);
	}

	return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
}

/**
 * pmcraid_release_config_buffers - release config.table buffers
 * @pinstance: pointer to per adapter instance structure
 *
 * Return Value
 *	 none
 */
static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
{
	if (pinstance->cfg_table != NULL &&
	    pinstance->cfg_table_bus_addr != 0) {
		pci_free_consistent(pinstance->pdev,
				    sizeof(struct pmcraid_config_table),
				    pinstance->cfg_table,
				    pinstance->cfg_table_bus_addr);
		pinstance->cfg_table = NULL;
		pinstance->cfg_table_bus_addr = 0;
	}

	if (pinstance->res_entries != NULL) {
		int i;

		for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
			list_del(&pinstance->res_entries[i].queue);
		kfree(pinstance->res_entries);
		pinstance->res_entries = NULL;
	}

	pmcraid_release_hcams(pinstance);
}

/**
 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
 * @pinstance : pointer to per adapter instance structure
 *
 * Return Value
 *	0 for successful allocation, -ENOMEM for any failure
 */
static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
{
	int i;

	pinstance->res_entries =
			kzalloc(sizeof(struct pmcraid_resource_entry) *
				PMCRAID_MAX_RESOURCES, GFP_KERNEL);

	if (NULL == pinstance->res_entries) {
		pmcraid_err("failed to allocate memory for resource table\n");
		return -ENOMEM;
	}

	for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
		list_add_tail(&pinstance->res_entries[i].queue,
			      &pinstance->free_res_q);

	pinstance->cfg_table =
		pci_alloc_consistent(pinstance->pdev,
				     sizeof(struct pmcraid_config_table),
				     &pinstance->cfg_table_bus_addr);

	if (NULL == pinstance->cfg_table) {
		pmcraid_err("couldn't alloc DMA memory for config table\n");
		pmcraid_release_config_buffers(pinstance);
		return -ENOMEM;
	}

	if (pmcraid_allocate_hcams(pinstance)) {
		pmcraid_err("could not alloc DMA memory for HCAMS\n");
		pmcraid_release_config_buffers(pinstance);
		return -ENOMEM;
	}

	return 0;
}

/**
 * pmcraid_init_tasklets - registers tasklets for response handling
 *
 * @pinstance: pointer adapter instance structure
 *
 * Return value
 *	none
 */
static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
{
	int i;
	for (i = 0; i < pinstance->num_hrrq; i++)
		tasklet_init(&pinstance->isr_tasklet[i],
			     pmcraid_tasklet_function,
			     (unsigned long)&pinstance->hrrq_vector[i]);
}

/**
 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return value
 *	none
 */
static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
{
	int i;
	for (i = 0; i < pinstance->num_hrrq; i++)
		tasklet_kill(&pinstance->isr_tasklet[i]);
}

/**
 * pmcraid_release_buffers - release per-adapter buffers allocated
 *
 * @pinstance: pointer to adapter soft state
 *
 * Return Value
 *	none
 */
static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
{
	pmcraid_release_config_buffers(pinstance);
	pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
	pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
	pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);

	if (pinstance->inq_data != NULL) {
		pci_free_consistent(pinstance->pdev,
				    sizeof(struct pmcraid_inquiry_data),
				    pinstance->inq_data,
				    pinstance->inq_data_baddr);

		pinstance->inq_data = NULL;
		pinstance->inq_data_baddr = 0;
	}

	if (pinstance->timestamp_data != NULL) {
		pci_free_consistent(pinstance->pdev,
				    sizeof(struct pmcraid_timestamp_data),
				    pinstance->timestamp_data,
				    pinstance->timestamp_data_baddr);

		pinstance->timestamp_data = NULL;
		pinstance->timestamp_data_baddr = 0;
	}
}

/**
 * pmcraid_init_buffers - allocates memory and initializes various structures
 * @pinstance: pointer to per adapter instance structure
 *
 * This routine pre-allocates memory based on the type of block as below:
 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
 * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
 * config-table entries      : DMAable memory using pci_alloc_consistent
 * HostRRQs                  : DMAable memory, using pci_alloc_consistent
 *
 * Return Value
 *	 0 in case all of the blocks are allocated, -ENOMEM otherwise.
 */
static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
{
	int i;

	if (pmcraid_allocate_host_rrqs(pinstance)) {
		pmcraid_err("couldn't allocate memory for %d host rrqs\n",
			     pinstance->num_hrrq);
		return -ENOMEM;
	}

	if (pmcraid_allocate_config_buffers(pinstance)) {
		pmcraid_err("couldn't allocate memory for config buffers\n");
		pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
		return -ENOMEM;
	}

	if (pmcraid_allocate_cmd_blocks(pinstance)) {
		pmcraid_err("couldn't allocate memory for cmd blocks\n");
		pmcraid_release_config_buffers(pinstance);
		pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
		return -ENOMEM;
	}

	if (pmcraid_allocate_control_blocks(pinstance)) {
		pmcraid_err("couldn't allocate memory control blocks\n");
		pmcraid_release_config_buffers(pinstance);
		pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
		pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
		return -ENOMEM;
	}

	/* allocate DMAable memory for page D0 INQUIRY buffer */
	pinstance->inq_data = pci_alloc_consistent(
					pinstance->pdev,
					sizeof(struct pmcraid_inquiry_data),
					&pinstance->inq_data_baddr);

	if (pinstance->inq_data == NULL) {
		pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
		pmcraid_release_buffers(pinstance);
		return -ENOMEM;
	}

	/* allocate DMAable memory for set timestamp data buffer */
	pinstance->timestamp_data = pci_alloc_consistent(
					pinstance->pdev,
					sizeof(struct pmcraid_timestamp_data),
					&pinstance->timestamp_data_baddr);

	if (pinstance->timestamp_data == NULL) {
		pmcraid_err("couldn't allocate DMA memory for \
				set time_stamp \n");
		pmcraid_release_buffers(pinstance);
		return -ENOMEM;
	}


	/* Initialize all the command blocks and add them to free pool. No
	 * need to lock (free_pool_lock) as this is done in initialization
	 * itself
	 */
	for (i = 0; i < PMCRAID_MAX_CMD; i++) {
		struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
		pmcraid_init_cmdblk(cmdp, i);
		cmdp->drv_inst = pinstance;
		list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
	}

	return 0;
}

/**
 * pmcraid_reinit_buffers - resets various buffer pointers
 * @pinstance: pointer to adapter instance
 * Return value
 *	none
 */
static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
{
	int i;
	int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;

	for (i = 0; i < pinstance->num_hrrq; i++) {
		memset(pinstance->hrrq_start[i], 0, buffer_size);
		pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
		pinstance->hrrq_end[i] =
			pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
		pinstance->host_toggle_bit[i] = 1;
	}
}

/**
 * pmcraid_init_instance - initialize per instance data structure
 * @pdev: pointer to pci device structure
 * @host: pointer to Scsi_Host structure
 * @mapped_pci_addr: memory mapped IOA configuration registers
 *
 * Return Value
 *	 0 on success, non-zero in case of any failure
 */
static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
				 void __iomem *mapped_pci_addr)
{
	struct pmcraid_instance *pinstance =
		(struct pmcraid_instance *)host->hostdata;

	pinstance->host = host;
	pinstance->pdev = pdev;

	/* Initialize register addresses */
	pinstance->mapped_dma_addr = mapped_pci_addr;

	/* Initialize chip-specific details */
	{
		struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
		struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;

		pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;

		pint_regs->ioa_host_interrupt_reg =
			mapped_pci_addr + chip_cfg->ioa_host_intr;
		pint_regs->ioa_host_interrupt_clr_reg =
			mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
		pint_regs->ioa_host_msix_interrupt_reg =
			mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
		pint_regs->host_ioa_interrupt_reg =
			mapped_pci_addr + chip_cfg->host_ioa_intr;
		pint_regs->host_ioa_interrupt_clr_reg =
			mapped_pci_addr + chip_cfg->host_ioa_intr_clr;

		/* Current version of firmware exposes interrupt mask set
		 * and mask clr registers through memory mapped bar0.
		 */
		pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
		pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
		pint_regs->ioa_host_interrupt_mask_reg =
			mapped_pci_addr + chip_cfg->ioa_host_mask;
		pint_regs->ioa_host_interrupt_mask_clr_reg =
			mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
		pint_regs->global_interrupt_mask_reg =
			mapped_pci_addr + chip_cfg->global_intr_mask;
	};

	pinstance->ioa_reset_attempts = 0;
	init_waitqueue_head(&pinstance->reset_wait_q);

	atomic_set(&pinstance->outstanding_cmds, 0);
	atomic_set(&pinstance->last_message_id, 0);
	atomic_set(&pinstance->expose_resources, 0);

	INIT_LIST_HEAD(&pinstance->free_res_q);
	INIT_LIST_HEAD(&pinstance->used_res_q);
	INIT_LIST_HEAD(&pinstance->free_cmd_pool);
	INIT_LIST_HEAD(&pinstance->pending_cmd_pool);

	spin_lock_init(&pinstance->free_pool_lock);
	spin_lock_init(&pinstance->pending_pool_lock);
	spin_lock_init(&pinstance->resource_lock);
	mutex_init(&pinstance->aen_queue_lock);

	/* Work-queue (Shared) for deferred processing error handling */
	INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);

	/* Initialize the default log_level */
	pinstance->current_log_level = pmcraid_log_level;

	/* Setup variables required for reset engine */
	pinstance->ioa_state = IOA_STATE_UNKNOWN;
	pinstance->reset_cmd = NULL;
	return 0;
}

/**
 * pmcraid_shutdown - shutdown adapter controller.
 * @pdev: pci device struct
 *
 * Issues an adapter shutdown to the card waits for its completion
 *
 * Return value
 *	  none
 */
static void pmcraid_shutdown(struct pci_dev *pdev)
{
	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
	pmcraid_reset_bringdown(pinstance);
}


/**
 * pmcraid_get_minor - returns unused minor number from minor number bitmap
 */
static unsigned short pmcraid_get_minor(void)
{
	int minor;

	minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
	__set_bit(minor, pmcraid_minor);
	return minor;
}

/**
 * pmcraid_release_minor - releases given minor back to minor number bitmap
 */
static void pmcraid_release_minor(unsigned short minor)
{
	__clear_bit(minor, pmcraid_minor);
}

/**
 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
 *
 * @pinstance: pointer to adapter instance for which to register device
 *
 * Return value
 *	0 in case of success, otherwise non-zero
 */
static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
{
	int minor;
	int error;

	minor = pmcraid_get_minor();
	cdev_init(&pinstance->cdev, &pmcraid_fops);
	pinstance->cdev.owner = THIS_MODULE;

	error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);

	if (error)
		pmcraid_release_minor(minor);
	else
		device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
			      NULL, "%s%u", PMCRAID_DEVFILE, minor);
	return error;
}

/**
 * pmcraid_release_chrdev - unregisters per-adapter management interface
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return value
 *  none
 */
static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
{
	pmcraid_release_minor(MINOR(pinstance->cdev.dev));
	device_destroy(pmcraid_class,
		       MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
	cdev_del(&pinstance->cdev);
}

/**
 * pmcraid_remove - IOA hot plug remove entry point
 * @pdev: pci device struct
 *
 * Return value
 *	  none
 */
static void pmcraid_remove(struct pci_dev *pdev)
{
	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);

	/* remove the management interface (/dev file) for this device */
	pmcraid_release_chrdev(pinstance);

	/* remove host template from scsi midlayer */
	scsi_remove_host(pinstance->host);

	/* block requests from mid-layer */
	scsi_block_requests(pinstance->host);

	/* initiate shutdown adapter */
	pmcraid_shutdown(pdev);

	pmcraid_disable_interrupts(pinstance, ~0);
	flush_work(&pinstance->worker_q);

	pmcraid_kill_tasklets(pinstance);
	pmcraid_unregister_interrupt_handler(pinstance);
	pmcraid_release_buffers(pinstance);
	iounmap(pinstance->mapped_dma_addr);
	pci_release_regions(pdev);
	scsi_host_put(pinstance->host);
	pci_disable_device(pdev);

	return;
}

#ifdef CONFIG_PM
/**
 * pmcraid_suspend - driver suspend entry point for power management
 * @pdev:   PCI device structure
 * @state:  PCI power state to suspend routine
 *
 * Return Value - 0 always
 */
static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);

	pmcraid_shutdown(pdev);
	pmcraid_disable_interrupts(pinstance, ~0);
	pmcraid_kill_tasklets(pinstance);
	pci_set_drvdata(pinstance->pdev, pinstance);
	pmcraid_unregister_interrupt_handler(pinstance);
	pci_save_state(pdev);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));

	return 0;
}

/**
 * pmcraid_resume - driver resume entry point PCI power management
 * @pdev: PCI device structure
 *
 * Return Value - 0 in case of success. Error code in case of any failure
 */
static int pmcraid_resume(struct pci_dev *pdev)
{
	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
	struct Scsi_Host *host = pinstance->host;
	int rc;

	pci_set_power_state(pdev, PCI_D0);
	pci_enable_wake(pdev, PCI_D0, 0);
	pci_restore_state(pdev);

	rc = pci_enable_device(pdev);

	if (rc) {
		dev_err(&pdev->dev, "resume: Enable device failed\n");
		return rc;
	}

	pci_set_master(pdev);

	if ((sizeof(dma_addr_t) == 4) ||
	     pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));

	if (rc == 0)
		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));

	if (rc != 0) {
		dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
		goto disable_device;
	}

	pmcraid_disable_interrupts(pinstance, ~0);
	atomic_set(&pinstance->outstanding_cmds, 0);
	rc = pmcraid_register_interrupt_handler(pinstance);

	if (rc) {
		dev_err(&pdev->dev,
			"resume: couldn't register interrupt handlers\n");
		rc = -ENODEV;
		goto release_host;
	}

	pmcraid_init_tasklets(pinstance);
	pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);

	/* Start with hard reset sequence which brings up IOA to operational
	 * state as well as completes the reset sequence.
	 */
	pinstance->ioa_hard_reset = 1;

	/* Start IOA firmware initialization and bring card to Operational
	 * state.
	 */
	if (pmcraid_reset_bringup(pinstance)) {
		dev_err(&pdev->dev, "couldn't initialize IOA\n");
		rc = -ENODEV;
		goto release_tasklets;
	}

	return 0;

release_tasklets:
	pmcraid_disable_interrupts(pinstance, ~0);
	pmcraid_kill_tasklets(pinstance);
	pmcraid_unregister_interrupt_handler(pinstance);

release_host:
	scsi_host_put(host);

disable_device:
	pci_disable_device(pdev);

	return rc;
}

#else

#define pmcraid_suspend NULL
#define pmcraid_resume  NULL

#endif /* CONFIG_PM */

/**
 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
 *				completion of the ioa reset
 * @cmd: pointer to reset command block
 */
static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long flags;

	spin_lock_irqsave(pinstance->host->host_lock, flags);
	pmcraid_ioa_reset(cmd);
	spin_unlock_irqrestore(pinstance->host->host_lock, flags);
	scsi_unblock_requests(pinstance->host);
	schedule_work(&pinstance->worker_q);
}

/**
 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
 *
 * @cmd: pointer to pmcraid_cmd structure
 *
 * Return Value
 *  0 for success or non-zero for failure cases
 */
static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;

	pmcraid_reinit_cmdblk(cmd);

	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	ioarcb->request_type = REQ_TYPE_IOACMD;
	ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
	ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;

	/* If this was called as part of resource table reinitialization due to
	 * lost CCN, it is enough to return the command block back to free pool
	 * as part of set_supported_devs completion function.
	 */
	if (cmd->drv_inst->reinit_cfg_table) {
		cmd->drv_inst->reinit_cfg_table = 0;
		cmd->release = 1;
		cmd_done = pmcraid_reinit_cfgtable_done;
	}

	/* we will be done with the reset sequence after set supported devices,
	 * setup the done function to return the command block back to free
	 * pool
	 */
	pmcraid_send_cmd(cmd,
			 cmd_done,
			 PMCRAID_SET_SUP_DEV_TIMEOUT,
			 pmcraid_timeout_handler);
	return;
}

/**
 * pmcraid_set_timestamp - set the timestamp to IOAFP
 *
 * @cmd: pointer to pmcraid_cmd structure
 *
 * Return Value
 *  0 for success or non-zero for failure cases
 */
static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	__be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;

	struct timeval tv;
	__le64 timestamp;

	do_gettimeofday(&tv);
	timestamp = tv.tv_sec * 1000;

	pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
	pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
	pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
	pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
	pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
	pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);

	pmcraid_reinit_cmdblk(cmd);
	ioarcb->request_type = REQ_TYPE_SCSI;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
	ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
	memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));

	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
	ioarcb->ioarcb_bus_addr &= ~(0x1FULL);

	ioarcb->request_flags0 |= NO_LINK_DESCS;
	ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
	ioarcb->data_transfer_length =
		cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
	ioadl = &(ioarcb->add_data.u.ioadl[0]);
	ioadl->flags = IOADL_FLAGS_LAST_DESC;
	ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
	ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));

	if (!pinstance->timestamp_error) {
		pinstance->timestamp_error = 0;
		pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
	} else {
		pmcraid_send_cmd(cmd, pmcraid_return_cmd,
			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
		return;
	}
}


/**
 * pmcraid_init_res_table - Initialize the resource table
 * @cmd:  pointer to pmcraid command struct
 *
 * This function looks through the existing resource table, comparing
 * it with the config table. This function will take care of old/new
 * devices and schedule adding/removing them from the mid-layer
 * as appropriate.
 *
 * Return value
 *	 None
 */
static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_resource_entry *res, *temp;
	struct pmcraid_config_table_entry *cfgte;
	unsigned long lock_flags;
	int found, rc, i;
	u16 fw_version;
	LIST_HEAD(old_res);

	if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
		pmcraid_err("IOA requires microcode download\n");

	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

	/* resource list is protected by pinstance->resource_lock.
	 * init_res_table can be called from probe (user-thread) or runtime
	 * reset (timer/tasklet)
	 */
	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);

	list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
		list_move_tail(&res->queue, &old_res);

	for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
		if (be16_to_cpu(pinstance->inq_data->fw_version) <=
						PMCRAID_FW_VERSION_1)
			cfgte = &pinstance->cfg_table->entries[i];
		else
			cfgte = (struct pmcraid_config_table_entry *)
					&pinstance->cfg_table->entries_ext[i];

		if (!pmcraid_expose_resource(fw_version, cfgte))
			continue;

		found = 0;

		/* If this entry was already detected and initialized */
		list_for_each_entry_safe(res, temp, &old_res, queue) {

			rc = memcmp(&res->cfg_entry.resource_address,
				    &cfgte->resource_address,
				    sizeof(cfgte->resource_address));
			if (!rc) {
				list_move_tail(&res->queue,
						&pinstance->used_res_q);
				found = 1;
				break;
			}
		}

		/* If this is new entry, initialize it and add it the queue */
		if (!found) {

			if (list_empty(&pinstance->free_res_q)) {
				pmcraid_err("Too many devices attached\n");
				break;
			}

			found = 1;
			res = list_entry(pinstance->free_res_q.next,
					 struct pmcraid_resource_entry, queue);

			res->scsi_dev = NULL;
			res->change_detected = RES_CHANGE_ADD;
			res->reset_progress = 0;
			list_move_tail(&res->queue, &pinstance->used_res_q);
		}

		/* copy new configuration table entry details into driver
		 * maintained resource entry
		 */
		if (found) {
			memcpy(&res->cfg_entry, cfgte,
					pinstance->config_table_entry_size);
			pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
				 res->cfg_entry.resource_type,
				 (fw_version <= PMCRAID_FW_VERSION_1 ?
					res->cfg_entry.unique_flags1 :
						res->cfg_entry.array_id & 0xFF),
				 le32_to_cpu(res->cfg_entry.resource_address));
		}
	}

	/* Detect any deleted entries, mark them for deletion from mid-layer */
	list_for_each_entry_safe(res, temp, &old_res, queue) {

		if (res->scsi_dev) {
			res->change_detected = RES_CHANGE_DEL;
			res->cfg_entry.resource_handle =
				PMCRAID_INVALID_RES_HANDLE;
			list_move_tail(&res->queue, &pinstance->used_res_q);
		} else {
			list_move_tail(&res->queue, &pinstance->free_res_q);
		}
	}

	/* release the resource list lock */
	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
	pmcraid_set_timestamp(cmd);
}

/**
 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
 * @cmd: pointer pmcraid_cmd struct
 *
 * This function sends a Query IOA Configuration command to the adapter to
 * retrieve the IOA configuration table.
 *
 * Return value:
 *	none
 */
static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));

	if (be16_to_cpu(pinstance->inq_data->fw_version) <=
					PMCRAID_FW_VERSION_1)
		pinstance->config_table_entry_size =
			sizeof(struct pmcraid_config_table_entry);
	else
		pinstance->config_table_entry_size =
			sizeof(struct pmcraid_config_table_entry_ext);

	ioarcb->request_type = REQ_TYPE_IOACMD;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);

	ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;

	/* firmware requires 4-byte length field, specified in B.E format */
	memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));

	/* Since entire config table can be described by single IOADL, it can
	 * be part of IOARCB itself
	 */
	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
	ioarcb->ioarcb_bus_addr &= ~(0x1FULL);

	ioarcb->request_flags0 |= NO_LINK_DESCS;
	ioarcb->data_transfer_length =
		cpu_to_le32(sizeof(struct pmcraid_config_table));

	ioadl = &(ioarcb->add_data.u.ioadl[0]);
	ioadl->flags = IOADL_FLAGS_LAST_DESC;
	ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
	ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));

	pmcraid_send_cmd(cmd, pmcraid_init_res_table,
			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
}


/**
 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
 * @pdev: pointer to pci device structure
 * @dev_id: pointer to device ids structure
 *
 * Return Value
 *	returns 0 if the device is claimed and successfully configured.
 *	returns non-zero error code in case of any failure
 */
static int pmcraid_probe(struct pci_dev *pdev,
			 const struct pci_device_id *dev_id)
{
	struct pmcraid_instance *pinstance;
	struct Scsi_Host *host;
	void __iomem *mapped_pci_addr;
	int rc = PCIBIOS_SUCCESSFUL;

	if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
		pmcraid_err
			("maximum number(%d) of supported adapters reached\n",
			 atomic_read(&pmcraid_adapter_count));
		return -ENOMEM;
	}

	atomic_inc(&pmcraid_adapter_count);
	rc = pci_enable_device(pdev);

	if (rc) {
		dev_err(&pdev->dev, "Cannot enable adapter\n");
		atomic_dec(&pmcraid_adapter_count);
		return rc;
	}

	dev_info(&pdev->dev,
		"Found new IOA(%x:%x), Total IOA count: %d\n",
		 pdev->vendor, pdev->device,
		 atomic_read(&pmcraid_adapter_count));

	rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);

	if (rc < 0) {
		dev_err(&pdev->dev,
			"Couldn't register memory range of registers\n");
		goto out_disable_device;
	}

	mapped_pci_addr = pci_iomap(pdev, 0, 0);

	if (!mapped_pci_addr) {
		dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
		rc = -ENOMEM;
		goto out_release_regions;
	}

	pci_set_master(pdev);

	/* Firmware requires the system bus address of IOARCB to be within
	 * 32-bit addressable range though it has 64-bit IOARRIN register.
	 * However, firmware supports 64-bit streaming DMA buffers, whereas
	 * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
	 * returns memory within 4GB (if not, change this logic), coherent
	 * buffers are within firmware acceptable address ranges.
	 */
	if ((sizeof(dma_addr_t) == 4) ||
	    pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));

	/* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
	 * bit mask for pci_alloc_consistent to return addresses within 4GB
	 */
	if (rc == 0)
		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));

	if (rc != 0) {
		dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
		goto cleanup_nomem;
	}

	host = scsi_host_alloc(&pmcraid_host_template,
				sizeof(struct pmcraid_instance));

	if (!host) {
		dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
		rc = -ENOMEM;
		goto cleanup_nomem;
	}

	host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
	host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
	host->unique_id = host->host_no;
	host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
	host->max_cmd_len = PMCRAID_MAX_CDB_LEN;

	/* zero out entire instance structure */
	pinstance = (struct pmcraid_instance *)host->hostdata;
	memset(pinstance, 0, sizeof(*pinstance));

	pinstance->chip_cfg =
		(struct pmcraid_chip_details *)(dev_id->driver_data);

	rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);

	if (rc < 0) {
		dev_err(&pdev->dev, "failed to initialize adapter instance\n");
		goto out_scsi_host_put;
	}

	pci_set_drvdata(pdev, pinstance);

	/* Save PCI config-space for use following the reset */
	rc = pci_save_state(pinstance->pdev);

	if (rc != 0) {
		dev_err(&pdev->dev, "Failed to save PCI config space\n");
		goto out_scsi_host_put;
	}

	pmcraid_disable_interrupts(pinstance, ~0);

	rc = pmcraid_register_interrupt_handler(pinstance);

	if (rc) {
		dev_err(&pdev->dev, "couldn't register interrupt handler\n");
		goto out_scsi_host_put;
	}

	pmcraid_init_tasklets(pinstance);

	/* allocate verious buffers used by LLD.*/
	rc = pmcraid_init_buffers(pinstance);

	if (rc) {
		pmcraid_err("couldn't allocate memory blocks\n");
		goto out_unregister_isr;
	}

	/* check the reset type required */
	pmcraid_reset_type(pinstance);

	pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);

	/* Start IOA firmware initialization and bring card to Operational
	 * state.
	 */
	pmcraid_info("starting IOA initialization sequence\n");
	if (pmcraid_reset_bringup(pinstance)) {
		dev_err(&pdev->dev, "couldn't initialize IOA\n");
		rc = 1;
		goto out_release_bufs;
	}

	/* Add adapter instance into mid-layer list */
	rc = scsi_add_host(pinstance->host, &pdev->dev);
	if (rc != 0) {
		pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
		goto out_release_bufs;
	}

	scsi_scan_host(pinstance->host);

	rc = pmcraid_setup_chrdev(pinstance);

	if (rc != 0) {
		pmcraid_err("couldn't create mgmt interface, error: %x\n",
			     rc);
		goto out_remove_host;
	}

	/* Schedule worker thread to handle CCN and take care of adding and
	 * removing devices to OS
	 */
	atomic_set(&pinstance->expose_resources, 1);
	schedule_work(&pinstance->worker_q);
	return rc;

out_remove_host:
	scsi_remove_host(host);

out_release_bufs:
	pmcraid_release_buffers(pinstance);

out_unregister_isr:
	pmcraid_kill_tasklets(pinstance);
	pmcraid_unregister_interrupt_handler(pinstance);

out_scsi_host_put:
	scsi_host_put(host);

cleanup_nomem:
	iounmap(mapped_pci_addr);

out_release_regions:
	pci_release_regions(pdev);

out_disable_device:
	atomic_dec(&pmcraid_adapter_count);
	pci_disable_device(pdev);
	return -ENODEV;
}

/*
 * PCI driver structure of pcmraid driver
 */
static struct pci_driver pmcraid_driver = {
	.name = PMCRAID_DRIVER_NAME,
	.id_table = pmcraid_pci_table,
	.probe = pmcraid_probe,
	.remove = pmcraid_remove,
	.suspend = pmcraid_suspend,
	.resume = pmcraid_resume,
	.shutdown = pmcraid_shutdown
};

/**
 * pmcraid_init - module load entry point
 */
static int __init pmcraid_init(void)
{
	dev_t dev;
	int error;

	pmcraid_info("%s Device Driver version: %s\n",
			 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);

	error = alloc_chrdev_region(&dev, 0,
				    PMCRAID_MAX_ADAPTERS,
				    PMCRAID_DEVFILE);

	if (error) {
		pmcraid_err("failed to get a major number for adapters\n");
		goto out_init;
	}

	pmcraid_major = MAJOR(dev);
	pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);

	if (IS_ERR(pmcraid_class)) {
		error = PTR_ERR(pmcraid_class);
		pmcraid_err("failed to register with sysfs, error = %x\n",
			    error);
		goto out_unreg_chrdev;
	}

	error = pmcraid_netlink_init();

	if (error)
		goto out_unreg_chrdev;

	error = pci_register_driver(&pmcraid_driver);

	if (error == 0)
		goto out_init;

	pmcraid_err("failed to register pmcraid driver, error = %x\n",
		     error);
	class_destroy(pmcraid_class);
	pmcraid_netlink_release();

out_unreg_chrdev:
	unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);

out_init:
	return error;
}

/**
 * pmcraid_exit - module unload entry point
 */
static void __exit pmcraid_exit(void)
{
	pmcraid_netlink_release();
	unregister_chrdev_region(MKDEV(pmcraid_major, 0),
				 PMCRAID_MAX_ADAPTERS);
	pci_unregister_driver(&pmcraid_driver);
	class_destroy(pmcraid_class);
}

module_init(pmcraid_init);
module_exit(pmcraid_exit);