summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/megaraid/megaraid_mbox.c
blob: c8923108183a5f6a976f33773266d0781170dfae (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
/*
 *
 *			Linux MegaRAID device driver
 *
 * Copyright (c) 2003-2004  LSI Logic Corporation.
 *
 *	   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.
 *
 * FILE		: megaraid_mbox.c
 * Version	: v2.20.5.1 (Nov 16 2006)
 *
 * Authors:
 * 	Atul Mukker		<Atul.Mukker@lsi.com>
 * 	Sreenivas Bagalkote	<Sreenivas.Bagalkote@lsi.com>
 * 	Manoj Jose		<Manoj.Jose@lsi.com>
 * 	Seokmann Ju
 *
 * List of supported controllers
 *
 * OEM	Product Name			VID	DID	SSVID	SSID
 * ---	------------			---	---	----	----
 * Dell PERC3/QC			101E	1960	1028	0471
 * Dell PERC3/DC			101E	1960	1028	0493
 * Dell PERC3/SC			101E	1960	1028	0475
 * Dell PERC3/Di			1028	1960	1028	0123
 * Dell PERC4/SC			1000	1960	1028	0520
 * Dell PERC4/DC			1000	1960	1028	0518
 * Dell PERC4/QC			1000	0407	1028	0531
 * Dell PERC4/Di			1028	000F	1028	014A
 * Dell PERC 4e/Si			1028	0013	1028	016c
 * Dell PERC 4e/Di			1028	0013	1028	016d
 * Dell PERC 4e/Di			1028	0013	1028	016e
 * Dell PERC 4e/Di			1028	0013	1028	016f
 * Dell PERC 4e/Di			1028	0013	1028	0170
 * Dell PERC 4e/DC			1000	0408	1028	0002
 * Dell PERC 4e/SC			1000	0408	1028	0001
 *
 *
 * LSI MegaRAID SCSI 320-0		1000	1960	1000	A520
 * LSI MegaRAID SCSI 320-1		1000	1960	1000	0520
 * LSI MegaRAID SCSI 320-2		1000	1960	1000	0518
 * LSI MegaRAID SCSI 320-0X		1000	0407	1000	0530
 * LSI MegaRAID SCSI 320-2X		1000	0407	1000	0532
 * LSI MegaRAID SCSI 320-4X		1000	0407	1000	0531
 * LSI MegaRAID SCSI 320-1E		1000	0408	1000	0001
 * LSI MegaRAID SCSI 320-2E		1000	0408	1000	0002
 * LSI MegaRAID SATA 150-4		1000	1960	1000	4523
 * LSI MegaRAID SATA 150-6		1000	1960	1000	0523
 * LSI MegaRAID SATA 300-4X		1000	0409	1000	3004
 * LSI MegaRAID SATA 300-8X		1000	0409	1000	3008
 *
 * INTEL RAID Controller SRCU42X	1000	0407	8086	0532
 * INTEL RAID Controller SRCS16		1000	1960	8086	0523
 * INTEL RAID Controller SRCU42E	1000	0408	8086	0002
 * INTEL RAID Controller SRCZCRX	1000	0407	8086	0530
 * INTEL RAID Controller SRCS28X	1000	0409	8086	3008
 * INTEL RAID Controller SROMBU42E	1000	0408	8086	3431
 * INTEL RAID Controller SROMBU42E	1000	0408	8086	3499
 * INTEL RAID Controller SRCU51L	1000	1960	8086	0520
 *
 * FSC	MegaRAID PCI Express ROMB	1000	0408	1734	1065
 *
 * ACER	MegaRAID ROMB-2E		1000	0408	1025	004D
 *
 * NEC	MegaRAID PCI Express ROMB	1000	0408	1033	8287
 *
 * For history of changes, see Documentation/ChangeLog.megaraid
 */

#include "megaraid_mbox.h"

static int megaraid_init(void);
static void megaraid_exit(void);

static int megaraid_probe_one(struct pci_dev*, const struct pci_device_id *);
static void megaraid_detach_one(struct pci_dev *);
static void megaraid_mbox_shutdown(struct pci_dev *);

static int megaraid_io_attach(adapter_t *);
static void megaraid_io_detach(adapter_t *);

static int megaraid_init_mbox(adapter_t *);
static void megaraid_fini_mbox(adapter_t *);

static int megaraid_alloc_cmd_packets(adapter_t *);
static void megaraid_free_cmd_packets(adapter_t *);

static int megaraid_mbox_setup_dma_pools(adapter_t *);
static void megaraid_mbox_teardown_dma_pools(adapter_t *);

static int megaraid_sysfs_alloc_resources(adapter_t *);
static void megaraid_sysfs_free_resources(adapter_t *);

static int megaraid_abort_handler(struct scsi_cmnd *);
static int megaraid_reset_handler(struct scsi_cmnd *);

static int mbox_post_sync_cmd(adapter_t *, uint8_t []);
static int mbox_post_sync_cmd_fast(adapter_t *, uint8_t []);
static int megaraid_busywait_mbox(mraid_device_t *);
static int megaraid_mbox_product_info(adapter_t *);
static int megaraid_mbox_extended_cdb(adapter_t *);
static int megaraid_mbox_support_ha(adapter_t *, uint16_t *);
static int megaraid_mbox_support_random_del(adapter_t *);
static int megaraid_mbox_get_max_sg(adapter_t *);
static void megaraid_mbox_enum_raid_scsi(adapter_t *);
static void megaraid_mbox_flush_cache(adapter_t *);
static int megaraid_mbox_fire_sync_cmd(adapter_t *);

static void megaraid_mbox_display_scb(adapter_t *, scb_t *);
static void megaraid_mbox_setup_device_map(adapter_t *);

static int megaraid_queue_command(struct scsi_cmnd *,
		void (*)(struct scsi_cmnd *));
static scb_t *megaraid_mbox_build_cmd(adapter_t *, struct scsi_cmnd *, int *);
static void megaraid_mbox_runpendq(adapter_t *, scb_t *);
static void megaraid_mbox_prepare_pthru(adapter_t *, scb_t *,
		struct scsi_cmnd *);
static void megaraid_mbox_prepare_epthru(adapter_t *, scb_t *,
		struct scsi_cmnd *);

static irqreturn_t megaraid_isr(int, void *);

static void megaraid_mbox_dpc(unsigned long);

static ssize_t megaraid_sysfs_show_app_hndl(struct class_device *, char *);
static ssize_t megaraid_sysfs_show_ldnum(struct device *, struct device_attribute *attr, char *);

static int megaraid_cmm_register(adapter_t *);
static int megaraid_cmm_unregister(adapter_t *);
static int megaraid_mbox_mm_handler(unsigned long, uioc_t *, uint32_t);
static int megaraid_mbox_mm_command(adapter_t *, uioc_t *);
static void megaraid_mbox_mm_done(adapter_t *, scb_t *);
static int gather_hbainfo(adapter_t *, mraid_hba_info_t *);
static int wait_till_fw_empty(adapter_t *);



MODULE_AUTHOR("megaraidlinux@lsi.com");
MODULE_DESCRIPTION("LSI Logic MegaRAID Mailbox Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(MEGARAID_VERSION);

/*
 * ### modules parameters for driver ###
 */

/*
 * Set to enable driver to expose unconfigured disk to kernel
 */
static int megaraid_expose_unconf_disks = 0;
module_param_named(unconf_disks, megaraid_expose_unconf_disks, int, 0);
MODULE_PARM_DESC(unconf_disks,
	"Set to expose unconfigured disks to kernel (default=0)");

/*
 * driver wait time if the adapter's mailbox is busy
 */
static unsigned int max_mbox_busy_wait = MBOX_BUSY_WAIT;
module_param_named(busy_wait, max_mbox_busy_wait, int, 0);
MODULE_PARM_DESC(busy_wait,
	"Max wait for mailbox in microseconds if busy (default=10)");

/*
 * number of sectors per IO command
 */
static unsigned int megaraid_max_sectors = MBOX_MAX_SECTORS;
module_param_named(max_sectors, megaraid_max_sectors, int, 0);
MODULE_PARM_DESC(max_sectors,
	"Maximum number of sectors per IO command (default=128)");

/*
 * number of commands per logical unit
 */
static unsigned int megaraid_cmd_per_lun = MBOX_DEF_CMD_PER_LUN;
module_param_named(cmd_per_lun, megaraid_cmd_per_lun, int, 0);
MODULE_PARM_DESC(cmd_per_lun,
	"Maximum number of commands per logical unit (default=64)");


/*
 * Fast driver load option, skip scanning for physical devices during load.
 * This would result in non-disk devices being skipped during driver load
 * time. These can be later added though, using /proc/scsi/scsi
 */
static unsigned int megaraid_fast_load = 0;
module_param_named(fast_load, megaraid_fast_load, int, 0);
MODULE_PARM_DESC(fast_load,
	"Faster loading of the driver, skips physical devices! (default=0)");


/*
 * mraid_debug level - threshold for amount of information to be displayed by
 * the driver. This level can be changed through modules parameters, ioctl or
 * sysfs/proc interface. By default, print the announcement messages only.
 */
int mraid_debug_level = CL_ANN;
module_param_named(debug_level, mraid_debug_level, int, 0);
MODULE_PARM_DESC(debug_level, "Debug level for driver (default=0)");

/*
 * ### global data ###
 */
static uint8_t megaraid_mbox_version[8] =
	{ 0x02, 0x20, 0x04, 0x06, 3, 7, 20, 5 };


/*
 * PCI table for all supported controllers.
 */
static struct pci_device_id pci_id_table_g[] =  {
	{
		PCI_VENDOR_ID_DELL,
		PCI_DEVICE_ID_PERC4_DI_DISCOVERY,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4_DI_DISCOVERY,
	},
	{
		PCI_VENDOR_ID_LSI_LOGIC,
		PCI_DEVICE_ID_PERC4_SC,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4_SC,
	},
	{
		PCI_VENDOR_ID_LSI_LOGIC,
		PCI_DEVICE_ID_PERC4_DC,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4_DC,
	},
	{
		PCI_VENDOR_ID_LSI_LOGIC,
		PCI_DEVICE_ID_VERDE,
		PCI_ANY_ID,
		PCI_ANY_ID,
	},
	{
		PCI_VENDOR_ID_DELL,
		PCI_DEVICE_ID_PERC4_DI_EVERGLADES,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4_DI_EVERGLADES,
	},
	{
		PCI_VENDOR_ID_DELL,
		PCI_DEVICE_ID_PERC4E_SI_BIGBEND,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4E_SI_BIGBEND,
	},
	{
		PCI_VENDOR_ID_DELL,
		PCI_DEVICE_ID_PERC4E_DI_KOBUK,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4E_DI_KOBUK,
	},
	{
		PCI_VENDOR_ID_DELL,
		PCI_DEVICE_ID_PERC4E_DI_CORVETTE,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4E_DI_CORVETTE,
	},
	{
		PCI_VENDOR_ID_DELL,
		PCI_DEVICE_ID_PERC4E_DI_EXPEDITION,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4E_DI_EXPEDITION,
	},
	{
		PCI_VENDOR_ID_DELL,
		PCI_DEVICE_ID_PERC4E_DI_GUADALUPE,
		PCI_VENDOR_ID_DELL,
		PCI_SUBSYS_ID_PERC4E_DI_GUADALUPE,
	},
	{
		PCI_VENDOR_ID_LSI_LOGIC,
		PCI_DEVICE_ID_DOBSON,
		PCI_ANY_ID,
		PCI_ANY_ID,
	},
	{
		PCI_VENDOR_ID_AMI,
		PCI_DEVICE_ID_AMI_MEGARAID3,
		PCI_ANY_ID,
		PCI_ANY_ID,
	},
	{
		PCI_VENDOR_ID_LSI_LOGIC,
		PCI_DEVICE_ID_AMI_MEGARAID3,
		PCI_ANY_ID,
		PCI_ANY_ID,
	},
	{
		PCI_VENDOR_ID_LSI_LOGIC,
		PCI_DEVICE_ID_LINDSAY,
		PCI_ANY_ID,
		PCI_ANY_ID,
	},
	{0}	/* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, pci_id_table_g);


static struct pci_driver megaraid_pci_driver_g = {
	.name		= "megaraid",
	.id_table	= pci_id_table_g,
	.probe		= megaraid_probe_one,
	.remove		= __devexit_p(megaraid_detach_one),
	.shutdown	= megaraid_mbox_shutdown,
};



// definitions for the device attributes for exporting logical drive number
// for a scsi address (Host, Channel, Id, Lun)

CLASS_DEVICE_ATTR(megaraid_mbox_app_hndl, S_IRUSR, megaraid_sysfs_show_app_hndl,
		NULL);

// Host template initializer for megaraid mbox sysfs device attributes
static struct class_device_attribute *megaraid_shost_attrs[] = {
	&class_device_attr_megaraid_mbox_app_hndl,
	NULL,
};


DEVICE_ATTR(megaraid_mbox_ld, S_IRUSR, megaraid_sysfs_show_ldnum, NULL);

// Host template initializer for megaraid mbox sysfs device attributes
static struct device_attribute *megaraid_sdev_attrs[] = {
	&dev_attr_megaraid_mbox_ld,
	NULL,
};

/**
 * megaraid_change_queue_depth - Change the device's queue depth
 * @sdev:	scsi device struct
 * @qdepth:	depth to set
 *
 * Return value:
 * 	actual depth set
 */
static int megaraid_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
	if (qdepth > MBOX_MAX_SCSI_CMDS)
		qdepth = MBOX_MAX_SCSI_CMDS;
	scsi_adjust_queue_depth(sdev, 0, qdepth);
	return sdev->queue_depth;
}

/*
 * Scsi host template for megaraid unified driver
 */
static struct scsi_host_template megaraid_template_g = {
	.module				= THIS_MODULE,
	.name				= "LSI Logic MegaRAID driver",
	.proc_name			= "megaraid",
	.queuecommand			= megaraid_queue_command,
	.eh_abort_handler		= megaraid_abort_handler,
	.eh_device_reset_handler	= megaraid_reset_handler,
	.eh_bus_reset_handler		= megaraid_reset_handler,
	.eh_host_reset_handler		= megaraid_reset_handler,
	.change_queue_depth		= megaraid_change_queue_depth,
	.use_clustering			= ENABLE_CLUSTERING,
	.use_sg_chaining		= ENABLE_SG_CHAINING,
	.sdev_attrs			= megaraid_sdev_attrs,
	.shost_attrs			= megaraid_shost_attrs,
};


/**
 * megaraid_init - module load hook
 *
 * We register ourselves as hotplug enabled module and let PCI subsystem
 * discover our adapters.
 */
static int __init
megaraid_init(void)
{
	int	rval;

	// Announce the driver version
	con_log(CL_ANN, (KERN_INFO "megaraid: %s %s\n", MEGARAID_VERSION,
		MEGARAID_EXT_VERSION));

	// check validity of module parameters
	if (megaraid_cmd_per_lun > MBOX_MAX_SCSI_CMDS) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid mailbox: max commands per lun reset to %d\n",
			MBOX_MAX_SCSI_CMDS));

		megaraid_cmd_per_lun = MBOX_MAX_SCSI_CMDS;
	}


	// register as a PCI hot-plug driver module
	rval = pci_register_driver(&megaraid_pci_driver_g);
	if (rval < 0) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: could not register hotplug support.\n"));
	}

	return rval;
}


/**
 * megaraid_exit - driver unload entry point
 *
 * We simply unwrap the megaraid_init routine here.
 */
static void __exit
megaraid_exit(void)
{
	con_log(CL_DLEVEL1, (KERN_NOTICE "megaraid: unloading framework\n"));

	// unregister as PCI hotplug driver
	pci_unregister_driver(&megaraid_pci_driver_g);

	return;
}


/**
 * megaraid_probe_one - PCI hotplug entry point
 * @pdev	: handle to this controller's PCI configuration space
 * @id		: pci device id of the class of controllers
 *
 * This routine should be called whenever a new adapter is detected by the
 * PCI hotplug susbsystem.
 */
static int __devinit
megaraid_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
	adapter_t	*adapter;


	// detected a new controller
	con_log(CL_ANN, (KERN_INFO
		"megaraid: probe new device %#4.04x:%#4.04x:%#4.04x:%#4.04x: ",
		pdev->vendor, pdev->device, pdev->subsystem_vendor,
		pdev->subsystem_device));

	con_log(CL_ANN, ("bus %d:slot %d:func %d\n", pdev->bus->number,
		PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn)));

	if (pci_enable_device(pdev)) {
		con_log(CL_ANN, (KERN_WARNING
				"megaraid: pci_enable_device failed\n"));

		return -ENODEV;
	}

	// Enable bus-mastering on this controller
	pci_set_master(pdev);

	// Allocate the per driver initialization structure
	adapter = kzalloc(sizeof(adapter_t), GFP_KERNEL);

	if (adapter == NULL) {
		con_log(CL_ANN, (KERN_WARNING
		"megaraid: out of memory, %s %d.\n", __FUNCTION__, __LINE__));

		goto out_probe_one;
	}


	// set up PCI related soft state and other pre-known parameters
	adapter->unique_id	= pdev->bus->number << 8 | pdev->devfn;
	adapter->irq		= pdev->irq;
	adapter->pdev		= pdev;

	atomic_set(&adapter->being_detached, 0);

	// Setup the default DMA mask. This would be changed later on
	// depending on hardware capabilities
	if (pci_set_dma_mask(adapter->pdev, DMA_32BIT_MASK) != 0) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid: pci_set_dma_mask failed:%d\n", __LINE__));

		goto out_free_adapter;
	}


	// Initialize the synchronization lock for kernel and LLD
	spin_lock_init(&adapter->lock);

	// Initialize the command queues: the list of free SCBs and the list
	// of pending SCBs.
	INIT_LIST_HEAD(&adapter->kscb_pool);
	spin_lock_init(SCSI_FREE_LIST_LOCK(adapter));

	INIT_LIST_HEAD(&adapter->pend_list);
	spin_lock_init(PENDING_LIST_LOCK(adapter));

	INIT_LIST_HEAD(&adapter->completed_list);
	spin_lock_init(COMPLETED_LIST_LOCK(adapter));


	// Start the mailbox based controller
	if (megaraid_init_mbox(adapter) != 0) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: maibox adapter did not initialize\n"));

		goto out_free_adapter;
	}

	// Register with LSI Common Management Module
	if (megaraid_cmm_register(adapter) != 0) {

		con_log(CL_ANN, (KERN_WARNING
		"megaraid: could not register with management module\n"));

		goto out_fini_mbox;
	}

	// setup adapter handle in PCI soft state
	pci_set_drvdata(pdev, adapter);

	// attach with scsi mid-layer
	if (megaraid_io_attach(adapter) != 0) {

		con_log(CL_ANN, (KERN_WARNING "megaraid: io attach failed\n"));

		goto out_cmm_unreg;
	}

	return 0;

out_cmm_unreg:
	pci_set_drvdata(pdev, NULL);
	megaraid_cmm_unregister(adapter);
out_fini_mbox:
	megaraid_fini_mbox(adapter);
out_free_adapter:
	kfree(adapter);
out_probe_one:
	pci_disable_device(pdev);

	return -ENODEV;
}


/**
 * megaraid_detach_one - release framework resources and call LLD release routine
 * @pdev	: handle for our PCI cofiguration space
 *
 * This routine is called during driver unload. We free all the allocated
 * resources and call the corresponding LLD so that it can also release all
 * its resources.
 *
 * This routine is also called from the PCI hotplug system.
 */
static void
megaraid_detach_one(struct pci_dev *pdev)
{
	adapter_t		*adapter;
	struct Scsi_Host	*host;


	// Start a rollback on this adapter
	adapter = pci_get_drvdata(pdev);

	if (!adapter) {
		con_log(CL_ANN, (KERN_CRIT
		"megaraid: Invalid detach on %#4.04x:%#4.04x:%#4.04x:%#4.04x\n",
			pdev->vendor, pdev->device, pdev->subsystem_vendor,
			pdev->subsystem_device));

		return;
	}
	else {
		con_log(CL_ANN, (KERN_NOTICE
		"megaraid: detaching device %#4.04x:%#4.04x:%#4.04x:%#4.04x\n",
			pdev->vendor, pdev->device, pdev->subsystem_vendor,
			pdev->subsystem_device));
	}


	host = adapter->host;

	// do not allow any more requests from the management module for this
	// adapter.
	// FIXME: How do we account for the request which might still be
	// pending with us?
	atomic_set(&adapter->being_detached, 1);

	// detach from the IO sub-system
	megaraid_io_detach(adapter);

	// reset the device state in the PCI structure. We check this
	// condition when we enter here. If the device state is NULL,
	// that would mean the device has already been removed
	pci_set_drvdata(pdev, NULL);

	// Unregister from common management module
	//
	// FIXME: this must return success or failure for conditions if there
	// is a command pending with LLD or not.
	megaraid_cmm_unregister(adapter);

	// finalize the mailbox based controller and release all resources
	megaraid_fini_mbox(adapter);

	kfree(adapter);

	scsi_host_put(host);

	pci_disable_device(pdev);

	return;
}


/**
 * megaraid_mbox_shutdown - PCI shutdown for megaraid HBA
 * @pdev		: generic driver model device
 *
 * Shutdown notification, perform flush cache.
 */
static void
megaraid_mbox_shutdown(struct pci_dev *pdev)
{
	adapter_t		*adapter = pci_get_drvdata(pdev);
	static int		counter;

	if (!adapter) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: null device in shutdown\n"));
		return;
	}

	// flush caches now
	con_log(CL_ANN, (KERN_INFO "megaraid: flushing adapter %d...",
		counter++));

	megaraid_mbox_flush_cache(adapter);

	con_log(CL_ANN, ("done\n"));
}


/**
 * megaraid_io_attach - attach a device with the IO subsystem
 * @adapter		: controller's soft state
 *
 * Attach this device with the IO subsystem.
 */
static int
megaraid_io_attach(adapter_t *adapter)
{
	struct Scsi_Host	*host;

	// Initialize SCSI Host structure
	host = scsi_host_alloc(&megaraid_template_g, 8);
	if (!host) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid mbox: scsi_register failed\n"));

		return -1;
	}

	SCSIHOST2ADAP(host)	= (caddr_t)adapter;
	adapter->host		= host;

	host->irq		= adapter->irq;
	host->unique_id		= adapter->unique_id;
	host->can_queue		= adapter->max_cmds;
	host->this_id		= adapter->init_id;
	host->sg_tablesize	= adapter->sglen;
	host->max_sectors	= adapter->max_sectors;
	host->cmd_per_lun	= adapter->cmd_per_lun;
	host->max_channel	= adapter->max_channel;
	host->max_id		= adapter->max_target;
	host->max_lun		= adapter->max_lun;


	// notify mid-layer about the new controller
	if (scsi_add_host(host, &adapter->pdev->dev)) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid mbox: scsi_add_host failed\n"));

		scsi_host_put(host);

		return -1;
	}

	scsi_scan_host(host);

	return 0;
}


/**
 * megaraid_io_detach - detach a device from the IO subsystem
 * @adapter		: controller's soft state
 *
 * Detach this device from the IO subsystem.
 */
static void
megaraid_io_detach(adapter_t *adapter)
{
	struct Scsi_Host	*host;

	con_log(CL_DLEVEL1, (KERN_INFO "megaraid: io detach\n"));

	host = adapter->host;

	scsi_remove_host(host);

	return;
}


/*
 * START: Mailbox Low Level Driver
 *
 * This is section specific to the single mailbox based controllers
 */

/**
 * megaraid_init_mbox - initialize controller
 * @adapter		: our soft state
 *
 * - Allocate 16-byte aligned mailbox memory for firmware handshake
 * - Allocate controller's memory resources
 * - Find out all initialization data
 * - Allocate memory required for all the commands
 * - Use internal library of FW routines, build up complete soft state
 */
static int __devinit
megaraid_init_mbox(adapter_t *adapter)
{
	struct pci_dev		*pdev;
	mraid_device_t		*raid_dev;
	int			i;
	uint32_t		magic64;


	adapter->ito	= MBOX_TIMEOUT;
	pdev		= adapter->pdev;

	/*
	 * Allocate and initialize the init data structure for mailbox
	 * controllers
	 */
	raid_dev = kzalloc(sizeof(mraid_device_t), GFP_KERNEL);
	if (raid_dev == NULL) return -1;


	/*
	 * Attach the adapter soft state to raid device soft state
	 */
	adapter->raid_device	= (caddr_t)raid_dev;
	raid_dev->fast_load	= megaraid_fast_load;


	// our baseport
	raid_dev->baseport = pci_resource_start(pdev, 0);

	if (pci_request_regions(pdev, "MegaRAID: LSI Logic Corporation") != 0) {

		con_log(CL_ANN, (KERN_WARNING
				"megaraid: mem region busy\n"));

		goto out_free_raid_dev;
	}

	raid_dev->baseaddr = ioremap_nocache(raid_dev->baseport, 128);

	if (!raid_dev->baseaddr) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid: could not map hba memory\n") );

		goto out_release_regions;
	}

	/* initialize the mutual exclusion lock for the mailbox */
	spin_lock_init(&raid_dev->mailbox_lock);

	/* allocate memory required for commands */
	if (megaraid_alloc_cmd_packets(adapter) != 0)
		goto out_iounmap;

	/*
	 * Issue SYNC cmd to flush the pending cmds in the adapter
	 * and initialize its internal state
	 */

	if (megaraid_mbox_fire_sync_cmd(adapter))
		con_log(CL_ANN, ("megaraid: sync cmd failed\n"));

	/*
	 * Setup the rest of the soft state using the library of
	 * FW routines
	 */

	/* request IRQ and register the interrupt service routine */
	if (request_irq(adapter->irq, megaraid_isr, IRQF_SHARED, "megaraid",
		adapter)) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid: Couldn't register IRQ %d!\n", adapter->irq));
		goto out_alloc_cmds;

	}

	// Product info
	if (megaraid_mbox_product_info(adapter) != 0)
		goto out_free_irq;

	// Do we support extended CDBs
	adapter->max_cdb_sz = 10;
	if (megaraid_mbox_extended_cdb(adapter) == 0) {
		adapter->max_cdb_sz = 16;
	}

	/*
	 * Do we support cluster environment, if we do, what is the initiator
	 * id.
	 * NOTE: In a non-cluster aware firmware environment, the LLD should
	 * return 7 as initiator id.
	 */
	adapter->ha		= 0;
	adapter->init_id	= -1;
	if (megaraid_mbox_support_ha(adapter, &adapter->init_id) == 0) {
		adapter->ha = 1;
	}

	/*
	 * Prepare the device ids array to have the mapping between the kernel
	 * device address and megaraid device address.
	 * We export the physical devices on their actual addresses. The
	 * logical drives are exported on a virtual SCSI channel
	 */
	megaraid_mbox_setup_device_map(adapter);

	// If the firmware supports random deletion, update the device id map
	if (megaraid_mbox_support_random_del(adapter)) {

		// Change the logical drives numbers in device_ids array one
		// slot in device_ids is reserved for target id, that's why
		// "<=" below
		for (i = 0; i <= MAX_LOGICAL_DRIVES_40LD; i++) {
			adapter->device_ids[adapter->max_channel][i] += 0x80;
		}
		adapter->device_ids[adapter->max_channel][adapter->init_id] =
			0xFF;

		raid_dev->random_del_supported = 1;
	}

	/*
	 * find out the maximum number of scatter-gather elements supported by
	 * this firmware
	 */
	adapter->sglen = megaraid_mbox_get_max_sg(adapter);

	// enumerate RAID and SCSI channels so that all devices on SCSI
	// channels can later be exported, including disk devices
	megaraid_mbox_enum_raid_scsi(adapter);

	/*
	 * Other parameters required by upper layer
	 *
	 * maximum number of sectors per IO command
	 */
	adapter->max_sectors = megaraid_max_sectors;

	/*
	 * number of queued commands per LUN.
	 */
	adapter->cmd_per_lun = megaraid_cmd_per_lun;

	/*
	 * Allocate resources required to issue FW calls, when sysfs is
	 * accessed
	 */
	if (megaraid_sysfs_alloc_resources(adapter) != 0)
		goto out_free_irq;

	// Set the DMA mask to 64-bit. All supported controllers as capable of
	// DMA in this range
	pci_read_config_dword(adapter->pdev, PCI_CONF_AMISIG64, &magic64);

	if (((magic64 == HBA_SIGNATURE_64_BIT) &&
		((adapter->pdev->subsystem_device !=
		PCI_SUBSYS_ID_MEGARAID_SATA_150_6) &&
		(adapter->pdev->subsystem_device !=
		PCI_SUBSYS_ID_MEGARAID_SATA_150_4))) ||
		(adapter->pdev->vendor == PCI_VENDOR_ID_LSI_LOGIC &&
		adapter->pdev->device == PCI_DEVICE_ID_VERDE) ||
		(adapter->pdev->vendor == PCI_VENDOR_ID_LSI_LOGIC &&
		adapter->pdev->device == PCI_DEVICE_ID_DOBSON) ||
		(adapter->pdev->vendor == PCI_VENDOR_ID_LSI_LOGIC &&
		adapter->pdev->device == PCI_DEVICE_ID_LINDSAY) ||
		(adapter->pdev->vendor == PCI_VENDOR_ID_DELL &&
		adapter->pdev->device == PCI_DEVICE_ID_PERC4_DI_EVERGLADES) ||
		(adapter->pdev->vendor == PCI_VENDOR_ID_DELL &&
		adapter->pdev->device == PCI_DEVICE_ID_PERC4E_DI_KOBUK)) {
		if (pci_set_dma_mask(adapter->pdev, DMA_64BIT_MASK)) {
			con_log(CL_ANN, (KERN_WARNING
				"megaraid: DMA mask for 64-bit failed\n"));

			if (pci_set_dma_mask (adapter->pdev, DMA_32BIT_MASK)) {
				con_log(CL_ANN, (KERN_WARNING
					"megaraid: 32-bit DMA mask failed\n"));
				goto out_free_sysfs_res;
			}
		}
	}

	// setup tasklet for DPC
	tasklet_init(&adapter->dpc_h, megaraid_mbox_dpc,
			(unsigned long)adapter);

	con_log(CL_DLEVEL1, (KERN_INFO
		"megaraid mbox hba successfully initialized\n"));

	return 0;

out_free_sysfs_res:
	megaraid_sysfs_free_resources(adapter);
out_free_irq:
	free_irq(adapter->irq, adapter);
out_alloc_cmds:
	megaraid_free_cmd_packets(adapter);
out_iounmap:
	iounmap(raid_dev->baseaddr);
out_release_regions:
	pci_release_regions(pdev);
out_free_raid_dev:
	kfree(raid_dev);

	return -1;
}


/**
 * megaraid_fini_mbox - undo controller initialization
 * @adapter		: our soft state
 */
static void
megaraid_fini_mbox(adapter_t *adapter)
{
	mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);

	// flush all caches
	megaraid_mbox_flush_cache(adapter);

	tasklet_kill(&adapter->dpc_h);

	megaraid_sysfs_free_resources(adapter);

	megaraid_free_cmd_packets(adapter);

	free_irq(adapter->irq, adapter);

	iounmap(raid_dev->baseaddr);

	pci_release_regions(adapter->pdev);

	kfree(raid_dev);

	return;
}


/**
 * megaraid_alloc_cmd_packets - allocate shared mailbox
 * @adapter		: soft state of the raid controller
 *
 * Allocate and align the shared mailbox. This maibox is used to issue
 * all the commands. For IO based controllers, the mailbox is also regsitered
 * with the FW. Allocate memory for all commands as well.
 * This is our big allocator.
 */
static int
megaraid_alloc_cmd_packets(adapter_t *adapter)
{
	mraid_device_t		*raid_dev = ADAP2RAIDDEV(adapter);
	struct pci_dev		*pdev;
	unsigned long		align;
	scb_t			*scb;
	mbox_ccb_t		*ccb;
	struct mraid_pci_blk	*epthru_pci_blk;
	struct mraid_pci_blk	*sg_pci_blk;
	struct mraid_pci_blk	*mbox_pci_blk;
	int			i;

	pdev = adapter->pdev;

	/*
	 * Setup the mailbox
	 * Allocate the common 16-byte aligned memory for the handshake
	 * mailbox.
	 */
	raid_dev->una_mbox64 = pci_alloc_consistent(adapter->pdev,
			sizeof(mbox64_t), &raid_dev->una_mbox64_dma);

	if (!raid_dev->una_mbox64) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));
		return -1;
	}
	memset(raid_dev->una_mbox64, 0, sizeof(mbox64_t));

	/*
	 * Align the mailbox at 16-byte boundary
	 */
	raid_dev->mbox	= &raid_dev->una_mbox64->mbox32;

	raid_dev->mbox	= (mbox_t *)((((unsigned long)raid_dev->mbox) + 15) &
				(~0UL ^ 0xFUL));

	raid_dev->mbox64 = (mbox64_t *)(((unsigned long)raid_dev->mbox) - 8);

	align = ((void *)raid_dev->mbox -
			((void *)&raid_dev->una_mbox64->mbox32));

	raid_dev->mbox_dma = (unsigned long)raid_dev->una_mbox64_dma + 8 +
			align;

	// Allocate memory for commands issued internally
	adapter->ibuf = pci_alloc_consistent(pdev, MBOX_IBUF_SIZE,
				&adapter->ibuf_dma_h);
	if (!adapter->ibuf) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));

		goto out_free_common_mbox;
	}
	memset(adapter->ibuf, 0, MBOX_IBUF_SIZE);

	// Allocate memory for our SCSI Command Blocks and their associated
	// memory

	/*
	 * Allocate memory for the base list of scb. Later allocate memory for
	 * CCBs and embedded components of each CCB and point the pointers in
	 * scb to the allocated components
	 * NOTE: The code to allocate SCB will be duplicated in all the LLD
	 * since the calling routine does not yet know the number of available
	 * commands.
	 */
	adapter->kscb_list = kcalloc(MBOX_MAX_SCSI_CMDS, sizeof(scb_t), GFP_KERNEL);

	if (adapter->kscb_list == NULL) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));
		goto out_free_ibuf;
	}

	// memory allocation for our command packets
	if (megaraid_mbox_setup_dma_pools(adapter) != 0) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));
		goto out_free_scb_list;
	}

	// Adjust the scb pointers and link in the free pool
	epthru_pci_blk	= raid_dev->epthru_pool;
	sg_pci_blk	= raid_dev->sg_pool;
	mbox_pci_blk	= raid_dev->mbox_pool;

	for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
		scb			= adapter->kscb_list + i;
		ccb			= raid_dev->ccb_list + i;

		ccb->mbox	= (mbox_t *)(mbox_pci_blk[i].vaddr + 16);
		ccb->raw_mbox	= (uint8_t *)ccb->mbox;
		ccb->mbox64	= (mbox64_t *)(mbox_pci_blk[i].vaddr + 8);
		ccb->mbox_dma_h	= (unsigned long)mbox_pci_blk[i].dma_addr + 16;

		// make sure the mailbox is aligned properly
		if (ccb->mbox_dma_h & 0x0F) {
			con_log(CL_ANN, (KERN_CRIT
				"megaraid mbox: not aligned on 16-bytes\n"));

			goto out_teardown_dma_pools;
		}

		ccb->epthru		= (mraid_epassthru_t *)
						epthru_pci_blk[i].vaddr;
		ccb->epthru_dma_h	= epthru_pci_blk[i].dma_addr;
		ccb->pthru		= (mraid_passthru_t *)ccb->epthru;
		ccb->pthru_dma_h	= ccb->epthru_dma_h;


		ccb->sgl64		= (mbox_sgl64 *)sg_pci_blk[i].vaddr;
		ccb->sgl_dma_h		= sg_pci_blk[i].dma_addr;
		ccb->sgl32		= (mbox_sgl32 *)ccb->sgl64;

		scb->ccb		= (caddr_t)ccb;
		scb->gp			= 0;

		scb->sno		= i;	// command index

		scb->scp		= NULL;
		scb->state		= SCB_FREE;
		scb->dma_direction	= PCI_DMA_NONE;
		scb->dma_type		= MRAID_DMA_NONE;
		scb->dev_channel	= -1;
		scb->dev_target		= -1;

		// put scb in the free pool
		list_add_tail(&scb->list, &adapter->kscb_pool);
	}

	return 0;

out_teardown_dma_pools:
	megaraid_mbox_teardown_dma_pools(adapter);
out_free_scb_list:
	kfree(adapter->kscb_list);
out_free_ibuf:
	pci_free_consistent(pdev, MBOX_IBUF_SIZE, (void *)adapter->ibuf,
		adapter->ibuf_dma_h);
out_free_common_mbox:
	pci_free_consistent(adapter->pdev, sizeof(mbox64_t),
		(caddr_t)raid_dev->una_mbox64, raid_dev->una_mbox64_dma);

	return -1;
}


/**
 * megaraid_free_cmd_packets - free memory
 * @adapter		: soft state of the raid controller
 *
 * Release memory resources allocated for commands.
 */
static void
megaraid_free_cmd_packets(adapter_t *adapter)
{
	mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);

	megaraid_mbox_teardown_dma_pools(adapter);

	kfree(adapter->kscb_list);

	pci_free_consistent(adapter->pdev, MBOX_IBUF_SIZE,
		(void *)adapter->ibuf, adapter->ibuf_dma_h);

	pci_free_consistent(adapter->pdev, sizeof(mbox64_t),
		(caddr_t)raid_dev->una_mbox64, raid_dev->una_mbox64_dma);
	return;
}


/**
 * megaraid_mbox_setup_dma_pools - setup dma pool for command packets
 * @adapter		: HBA soft state
 *
 * Setup the dma pools for mailbox, passthru and extended passthru structures,
 * and scatter-gather lists.
 */
static int
megaraid_mbox_setup_dma_pools(adapter_t *adapter)
{
	mraid_device_t		*raid_dev = ADAP2RAIDDEV(adapter);
	struct mraid_pci_blk	*epthru_pci_blk;
	struct mraid_pci_blk	*sg_pci_blk;
	struct mraid_pci_blk	*mbox_pci_blk;
	int			i;



	// Allocate memory for 16-bytes aligned mailboxes
	raid_dev->mbox_pool_handle = pci_pool_create("megaraid mbox pool",
						adapter->pdev,
						sizeof(mbox64_t) + 16,
						16, 0);

	if (raid_dev->mbox_pool_handle == NULL) {
		goto fail_setup_dma_pool;
	}

	mbox_pci_blk = raid_dev->mbox_pool;
	for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
		mbox_pci_blk[i].vaddr = pci_pool_alloc(
						raid_dev->mbox_pool_handle,
						GFP_KERNEL,
						&mbox_pci_blk[i].dma_addr);
		if (!mbox_pci_blk[i].vaddr) {
			goto fail_setup_dma_pool;
		}
	}

	/*
	 * Allocate memory for each embedded passthru strucuture pointer
	 * Request for a 128 bytes aligned structure for each passthru command
	 * structure
	 * Since passthru and extended passthru commands are exclusive, they
	 * share common memory pool. Passthru structures piggyback on memory
	 * allocted to extended passthru since passthru is smaller of the two
	 */
	raid_dev->epthru_pool_handle = pci_pool_create("megaraid mbox pthru",
			adapter->pdev, sizeof(mraid_epassthru_t), 128, 0);

	if (raid_dev->epthru_pool_handle == NULL) {
		goto fail_setup_dma_pool;
	}

	epthru_pci_blk = raid_dev->epthru_pool;
	for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
		epthru_pci_blk[i].vaddr = pci_pool_alloc(
						raid_dev->epthru_pool_handle,
						GFP_KERNEL,
						&epthru_pci_blk[i].dma_addr);
		if (!epthru_pci_blk[i].vaddr) {
			goto fail_setup_dma_pool;
		}
	}


	// Allocate memory for each scatter-gather list. Request for 512 bytes
	// alignment for each sg list
	raid_dev->sg_pool_handle = pci_pool_create("megaraid mbox sg",
					adapter->pdev,
					sizeof(mbox_sgl64) * MBOX_MAX_SG_SIZE,
					512, 0);

	if (raid_dev->sg_pool_handle == NULL) {
		goto fail_setup_dma_pool;
	}

	sg_pci_blk = raid_dev->sg_pool;
	for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
		sg_pci_blk[i].vaddr = pci_pool_alloc(
						raid_dev->sg_pool_handle,
						GFP_KERNEL,
						&sg_pci_blk[i].dma_addr);
		if (!sg_pci_blk[i].vaddr) {
			goto fail_setup_dma_pool;
		}
	}

	return 0;

fail_setup_dma_pool:
	megaraid_mbox_teardown_dma_pools(adapter);
	return -1;
}


/**
 * megaraid_mbox_teardown_dma_pools - teardown dma pools for command packets
 * @adapter		: HBA soft state
 *
 * Teardown the dma pool for mailbox, passthru and extended passthru
 * structures, and scatter-gather lists.
 */
static void
megaraid_mbox_teardown_dma_pools(adapter_t *adapter)
{
	mraid_device_t		*raid_dev = ADAP2RAIDDEV(adapter);
	struct mraid_pci_blk	*epthru_pci_blk;
	struct mraid_pci_blk	*sg_pci_blk;
	struct mraid_pci_blk	*mbox_pci_blk;
	int			i;


	sg_pci_blk = raid_dev->sg_pool;
	for (i = 0; i < MBOX_MAX_SCSI_CMDS && sg_pci_blk[i].vaddr; i++) {
		pci_pool_free(raid_dev->sg_pool_handle, sg_pci_blk[i].vaddr,
			sg_pci_blk[i].dma_addr);
	}
	if (raid_dev->sg_pool_handle)
		pci_pool_destroy(raid_dev->sg_pool_handle);


	epthru_pci_blk = raid_dev->epthru_pool;
	for (i = 0; i < MBOX_MAX_SCSI_CMDS && epthru_pci_blk[i].vaddr; i++) {
		pci_pool_free(raid_dev->epthru_pool_handle,
			epthru_pci_blk[i].vaddr, epthru_pci_blk[i].dma_addr);
	}
	if (raid_dev->epthru_pool_handle)
		pci_pool_destroy(raid_dev->epthru_pool_handle);


	mbox_pci_blk = raid_dev->mbox_pool;
	for (i = 0; i < MBOX_MAX_SCSI_CMDS && mbox_pci_blk[i].vaddr; i++) {
		pci_pool_free(raid_dev->mbox_pool_handle,
			mbox_pci_blk[i].vaddr, mbox_pci_blk[i].dma_addr);
	}
	if (raid_dev->mbox_pool_handle)
		pci_pool_destroy(raid_dev->mbox_pool_handle);

	return;
}


/**
 * megaraid_alloc_scb - detach and return a scb from the free list
 * @adapter	: controller's soft state
 * @scp		: pointer to the scsi command to be executed
 *
 * Return the scb from the head of the free list. %NULL if there are none
 * available.
 */
static scb_t *
megaraid_alloc_scb(adapter_t *adapter, struct scsi_cmnd *scp)
{
	struct list_head	*head = &adapter->kscb_pool;
	scb_t			*scb = NULL;
	unsigned long		flags;

	// detach scb from free pool
	spin_lock_irqsave(SCSI_FREE_LIST_LOCK(adapter), flags);

	if (list_empty(head)) {
		spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);
		return NULL;
	}

	scb = list_entry(head->next, scb_t, list);
	list_del_init(&scb->list);

	spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);

	scb->state	= SCB_ACTIVE;
	scb->scp	= scp;
	scb->dma_type	= MRAID_DMA_NONE;

	return scb;
}


/**
 * megaraid_dealloc_scb - return the scb to the free pool
 * @adapter	: controller's soft state
 * @scb		: scb to be freed
 *
 * Return the scb back to the free list of scbs. The caller must 'flush' the
 * SCB before calling us. E.g., performing pci_unamp and/or pci_sync etc.
 * NOTE NOTE: Make sure the scb is not on any list before calling this
 * routine.
 */
static inline void
megaraid_dealloc_scb(adapter_t *adapter, scb_t *scb)
{
	unsigned long		flags;

	// put scb in the free pool
	scb->state	= SCB_FREE;
	scb->scp	= NULL;
	spin_lock_irqsave(SCSI_FREE_LIST_LOCK(adapter), flags);

	list_add(&scb->list, &adapter->kscb_pool);

	spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);

	return;
}


/**
 * megaraid_mbox_mksgl - make the scatter-gather list
 * @adapter	: controller's soft state
 * @scb		: scsi control block
 *
 * Prepare the scatter-gather list.
 */
static int
megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)
{
	struct scatterlist	*sgl;
	mbox_ccb_t		*ccb;
	struct scsi_cmnd	*scp;
	int			sgcnt;
	int			i;


	scp	= scb->scp;
	ccb	= (mbox_ccb_t *)scb->ccb;

	sgcnt = scsi_dma_map(scp);
	BUG_ON(sgcnt < 0 || sgcnt > adapter->sglen);

	// no mapping required if no data to be transferred
	if (!sgcnt)
		return 0;

	scb->dma_type = MRAID_DMA_WSG;

	scsi_for_each_sg(scp, sgl, sgcnt, i) {
		ccb->sgl64[i].address	= sg_dma_address(sgl);
		ccb->sgl64[i].length	= sg_dma_len(sgl);
	}

	// Return count of SG nodes
	return sgcnt;
}


/**
 * mbox_post_cmd - issue a mailbox command
 * @adapter	: controller's soft state
 * @scb		: command to be issued
 *
 * Post the command to the controller if mailbox is available.
 */
static int
mbox_post_cmd(adapter_t *adapter, scb_t *scb)
{
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	mbox64_t	*mbox64;
	mbox_t		*mbox;
	mbox_ccb_t	*ccb;
	unsigned long	flags;
	unsigned int	i = 0;


	ccb	= (mbox_ccb_t *)scb->ccb;
	mbox	= raid_dev->mbox;
	mbox64	= raid_dev->mbox64;

	/*
	 * Check for busy mailbox. If it is, return failure - the caller
	 * should retry later.
	 */
	spin_lock_irqsave(MAILBOX_LOCK(raid_dev), flags);

	if (unlikely(mbox->busy)) {
		do {
			udelay(1);
			i++;
			rmb();
		} while(mbox->busy && (i < max_mbox_busy_wait));

		if (mbox->busy) {

			spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);

			return -1;
		}
	}


	// Copy this command's mailbox data into "adapter's" mailbox
	memcpy((caddr_t)mbox64, (caddr_t)ccb->mbox64, 22);
	mbox->cmdid = scb->sno;

	adapter->outstanding_cmds++;

	if (scb->dma_direction == PCI_DMA_TODEVICE)
		pci_dma_sync_sg_for_device(adapter->pdev,
					   scsi_sglist(scb->scp),
					   scsi_sg_count(scb->scp),
					   PCI_DMA_TODEVICE);

	mbox->busy	= 1;	// Set busy
	mbox->poll	= 0;
	mbox->ack	= 0;
	wmb();

	WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);

	spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);

	return 0;
}


/**
 * megaraid_queue_command - generic queue entry point for all LLDs
 * @scp		: pointer to the scsi command to be executed
 * @done	: callback routine to be called after the cmd has be completed
 *
 * Queue entry point for mailbox based controllers.
 */
static int
megaraid_queue_command(struct scsi_cmnd *scp, void (*done)(struct scsi_cmnd *))
{
	adapter_t	*adapter;
	scb_t		*scb;
	int		if_busy;

	adapter		= SCP2ADAPTER(scp);
	scp->scsi_done	= done;
	scp->result	= 0;

	/*
	 * Allocate and build a SCB request
	 * if_busy flag will be set if megaraid_mbox_build_cmd() command could
	 * not allocate scb. We will return non-zero status in that case.
	 * NOTE: scb can be null even though certain commands completed
	 * successfully, e.g., MODE_SENSE and TEST_UNIT_READY, it would
	 * return 0 in that case, and we would do the callback right away.
	 */
	if_busy	= 0;
	scb = megaraid_mbox_build_cmd(adapter, scp, &if_busy);
	if (!scb) {	// command already completed
		done(scp);
		return 0;
	}

	megaraid_mbox_runpendq(adapter, scb);
	return if_busy;
}

/**
 * megaraid_mbox_build_cmd - transform the mid-layer scsi commands
 * @adapter	: controller's soft state
 * @scp		: mid-layer scsi command pointer
 * @busy	: set if request could not be completed because of lack of
 *		resources
 *
 * Transform the mid-layer scsi command to megaraid firmware lingua.
 * Convert the command issued by mid-layer to format understood by megaraid
 * firmware. We also complete certain commands without sending them to firmware.
 */
static scb_t *
megaraid_mbox_build_cmd(adapter_t *adapter, struct scsi_cmnd *scp, int *busy)
{
	mraid_device_t		*rdev = ADAP2RAIDDEV(adapter);
	int			channel;
	int			target;
	int			islogical;
	mbox_ccb_t		*ccb;
	mraid_passthru_t	*pthru;
	mbox64_t		*mbox64;
	mbox_t			*mbox;
	scb_t			*scb;
	char			skip[] = "skipping";
	char			scan[] = "scanning";
	char			*ss;


	/*
	 * Get the appropriate device map for the device this command is
	 * intended for
	 */
	MRAID_GET_DEVICE_MAP(adapter, scp, channel, target, islogical);

	/*
	 * Logical drive commands
	 */
	if (islogical) {
		switch (scp->cmnd[0]) {
		case TEST_UNIT_READY:
			/*
			 * Do we support clustering and is the support enabled
			 * If no, return success always
			 */
			if (!adapter->ha) {
				scp->result = (DID_OK << 16);
				return NULL;
			}

			if (!(scb = megaraid_alloc_scb(adapter, scp))) {
				scp->result = (DID_ERROR << 16);
				*busy = 1;
				return NULL;
			}

			scb->dma_direction	= scp->sc_data_direction;
			scb->dev_channel	= 0xFF;
			scb->dev_target		= target;
			ccb			= (mbox_ccb_t *)scb->ccb;

			/*
			 * The command id will be provided by the command
			 * issuance routine
			 */
			ccb->raw_mbox[0]	= CLUSTER_CMD;
			ccb->raw_mbox[2]	= RESERVATION_STATUS;
			ccb->raw_mbox[3]	= target;

			return scb;

		case MODE_SENSE:
		{
			struct scatterlist	*sgl;
			caddr_t			vaddr;

			sgl = scsi_sglist(scp);
			if (sg_page(sgl)) {
				vaddr = (caddr_t) sg_virt(&sgl[0]);

				memset(vaddr, 0, scp->cmnd[4]);
			}
			else {
				con_log(CL_ANN, (KERN_WARNING
						 "megaraid mailbox: invalid sg:%d\n",
						 __LINE__));
			}
		}
		scp->result = (DID_OK << 16);
		return NULL;

		case INQUIRY:
			/*
			 * Display the channel scan for logical drives
			 * Do not display scan for a channel if already done.
			 */
			if (!(rdev->last_disp & (1L << SCP2CHANNEL(scp)))) {

				con_log(CL_ANN, (KERN_INFO
					"scsi[%d]: scanning scsi channel %d",
					adapter->host->host_no,
					SCP2CHANNEL(scp)));

				con_log(CL_ANN, (
					" [virtual] for logical drives\n"));

				rdev->last_disp |= (1L << SCP2CHANNEL(scp));
			}

			if (scp->cmnd[1] & MEGA_SCSI_INQ_EVPD) {
				scp->sense_buffer[0] = 0x70;
				scp->sense_buffer[2] = ILLEGAL_REQUEST;
				scp->sense_buffer[12] = MEGA_INVALID_FIELD_IN_CDB;
				scp->result = CHECK_CONDITION << 1;
				return NULL;
			}

			/* Fall through */

		case READ_CAPACITY:
			/*
			 * Do not allow LUN > 0 for logical drives and
			 * requests for more than 40 logical drives
			 */
			if (SCP2LUN(scp)) {
				scp->result = (DID_BAD_TARGET << 16);
				return NULL;
			}
			if ((target % 0x80) >= MAX_LOGICAL_DRIVES_40LD) {
				scp->result = (DID_BAD_TARGET << 16);
				return NULL;
			}


			/* Allocate a SCB and initialize passthru */
			if (!(scb = megaraid_alloc_scb(adapter, scp))) {
				scp->result = (DID_ERROR << 16);
				*busy = 1;
				return NULL;
			}

			ccb			= (mbox_ccb_t *)scb->ccb;
			scb->dev_channel	= 0xFF;
			scb->dev_target		= target;
			pthru			= ccb->pthru;
			mbox			= ccb->mbox;
			mbox64			= ccb->mbox64;

			pthru->timeout		= 0;
			pthru->ars		= 1;
			pthru->reqsenselen	= 14;
			pthru->islogical	= 1;
			pthru->logdrv		= target;
			pthru->cdblen		= scp->cmd_len;
			memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);

			mbox->cmd		= MBOXCMD_PASSTHRU64;
			scb->dma_direction	= scp->sc_data_direction;

			pthru->dataxferlen	= scsi_bufflen(scp);
			pthru->dataxferaddr	= ccb->sgl_dma_h;
			pthru->numsge		= megaraid_mbox_mksgl(adapter,
							scb);

			mbox->xferaddr		= 0xFFFFFFFF;
			mbox64->xferaddr_lo	= (uint32_t )ccb->pthru_dma_h;
			mbox64->xferaddr_hi	= 0;

			return scb;

		case READ_6:
		case WRITE_6:
		case READ_10:
		case WRITE_10:
		case READ_12:
		case WRITE_12:

			/*
			 * Allocate a SCB and initialize mailbox
			 */
			if (!(scb = megaraid_alloc_scb(adapter, scp))) {
				scp->result = (DID_ERROR << 16);
				*busy = 1;
				return NULL;
			}
			ccb			= (mbox_ccb_t *)scb->ccb;
			scb->dev_channel	= 0xFF;
			scb->dev_target		= target;
			mbox			= ccb->mbox;
			mbox64			= ccb->mbox64;
			mbox->logdrv		= target;

			/*
			 * A little HACK: 2nd bit is zero for all scsi read
			 * commands and is set for all scsi write commands
			 */
			mbox->cmd = (scp->cmnd[0] & 0x02) ?  MBOXCMD_LWRITE64:
					MBOXCMD_LREAD64 ;

			/*
			 * 6-byte READ(0x08) or WRITE(0x0A) cdb
			 */
			if (scp->cmd_len == 6) {
				mbox->numsectors = (uint32_t)scp->cmnd[4];
				mbox->lba =
					((uint32_t)scp->cmnd[1] << 16)	|
					((uint32_t)scp->cmnd[2] << 8)	|
					(uint32_t)scp->cmnd[3];

				mbox->lba &= 0x1FFFFF;
			}

			/*
			 * 10-byte READ(0x28) or WRITE(0x2A) cdb
			 */
			else if (scp->cmd_len == 10) {
				mbox->numsectors =
					(uint32_t)scp->cmnd[8] |
					((uint32_t)scp->cmnd[7] << 8);
				mbox->lba =
					((uint32_t)scp->cmnd[2] << 24) |
					((uint32_t)scp->cmnd[3] << 16) |
					((uint32_t)scp->cmnd[4] << 8) |
					(uint32_t)scp->cmnd[5];
			}

			/*
			 * 12-byte READ(0xA8) or WRITE(0xAA) cdb
			 */
			else if (scp->cmd_len == 12) {
				mbox->lba =
					((uint32_t)scp->cmnd[2] << 24) |
					((uint32_t)scp->cmnd[3] << 16) |
					((uint32_t)scp->cmnd[4] << 8) |
					(uint32_t)scp->cmnd[5];

				mbox->numsectors =
					((uint32_t)scp->cmnd[6] << 24) |
					((uint32_t)scp->cmnd[7] << 16) |
					((uint32_t)scp->cmnd[8] << 8) |
					(uint32_t)scp->cmnd[9];
			}
			else {
				con_log(CL_ANN, (KERN_WARNING
					"megaraid: unsupported CDB length\n"));

				megaraid_dealloc_scb(adapter, scb);

				scp->result = (DID_ERROR << 16);
				return NULL;
			}

			scb->dma_direction = scp->sc_data_direction;

			// Calculate Scatter-Gather info
			mbox64->xferaddr_lo	= (uint32_t )ccb->sgl_dma_h;
			mbox->numsge		= megaraid_mbox_mksgl(adapter,
							scb);
			mbox->xferaddr		= 0xFFFFFFFF;
			mbox64->xferaddr_hi	= 0;

			return scb;

		case RESERVE:
		case RELEASE:
			/*
			 * Do we support clustering and is the support enabled
			 */
			if (!adapter->ha) {
				scp->result = (DID_BAD_TARGET << 16);
				return NULL;
			}

			/*
			 * Allocate a SCB and initialize mailbox
			 */
			if (!(scb = megaraid_alloc_scb(adapter, scp))) {
				scp->result = (DID_ERROR << 16);
				*busy = 1;
				return NULL;
			}

			ccb			= (mbox_ccb_t *)scb->ccb;
			scb->dev_channel	= 0xFF;
			scb->dev_target		= target;
			ccb->raw_mbox[0]	= CLUSTER_CMD;
			ccb->raw_mbox[2]	=  (scp->cmnd[0] == RESERVE) ?
						RESERVE_LD : RELEASE_LD;

			ccb->raw_mbox[3]	= target;
			scb->dma_direction	= scp->sc_data_direction;

			return scb;

		default:
			scp->result = (DID_BAD_TARGET << 16);
			return NULL;
		}
	}
	else { // Passthru device commands

		// Do not allow access to target id > 15 or LUN > 7
		if (target > 15 || SCP2LUN(scp) > 7) {
			scp->result = (DID_BAD_TARGET << 16);
			return NULL;
		}

		// if fast load option was set and scan for last device is
		// over, reset the fast_load flag so that during a possible
		// next scan, devices can be made available
		if (rdev->fast_load && (target == 15) &&
			(SCP2CHANNEL(scp) == adapter->max_channel -1)) {

			con_log(CL_ANN, (KERN_INFO
			"megaraid[%d]: physical device scan re-enabled\n",
				adapter->host->host_no));
			rdev->fast_load = 0;
		}

		/*
		 * Display the channel scan for physical devices
		 */
		if (!(rdev->last_disp & (1L << SCP2CHANNEL(scp)))) {

			ss = rdev->fast_load ? skip : scan;

			con_log(CL_ANN, (KERN_INFO
				"scsi[%d]: %s scsi channel %d [Phy %d]",
				adapter->host->host_no, ss, SCP2CHANNEL(scp),
				channel));

			con_log(CL_ANN, (
				" for non-raid devices\n"));

			rdev->last_disp |= (1L << SCP2CHANNEL(scp));
		}

		// disable channel sweep if fast load option given
		if (rdev->fast_load) {
			scp->result = (DID_BAD_TARGET << 16);
			return NULL;
		}

		// Allocate a SCB and initialize passthru
		if (!(scb = megaraid_alloc_scb(adapter, scp))) {
			scp->result = (DID_ERROR << 16);
			*busy = 1;
			return NULL;
		}

		ccb			= (mbox_ccb_t *)scb->ccb;
		scb->dev_channel	= channel;
		scb->dev_target		= target;
		scb->dma_direction	= scp->sc_data_direction;
		mbox			= ccb->mbox;
		mbox64			= ccb->mbox64;

		// Does this firmware support extended CDBs
		if (adapter->max_cdb_sz == 16) {
			mbox->cmd		= MBOXCMD_EXTPTHRU;

			megaraid_mbox_prepare_epthru(adapter, scb, scp);

			mbox64->xferaddr_lo	= (uint32_t)ccb->epthru_dma_h;
			mbox64->xferaddr_hi	= 0;
			mbox->xferaddr		= 0xFFFFFFFF;
		}
		else {
			mbox->cmd = MBOXCMD_PASSTHRU64;

			megaraid_mbox_prepare_pthru(adapter, scb, scp);

			mbox64->xferaddr_lo	= (uint32_t)ccb->pthru_dma_h;
			mbox64->xferaddr_hi	= 0;
			mbox->xferaddr		= 0xFFFFFFFF;
		}
		return scb;
	}

	// NOT REACHED
}


/**
 * megaraid_mbox_runpendq - execute commands queued in the pending queue
 * @adapter	: controller's soft state
 * @scb_q	: SCB to be queued in the pending list
 *
 * Scan the pending list for commands which are not yet issued and try to
 * post to the controller. The SCB can be a null pointer, which would indicate
 * no SCB to be queue, just try to execute the ones in the pending list.
 *
 * NOTE: We do not actually traverse the pending list. The SCBs are plucked
 * out from the head of the pending list. If it is successfully issued, the
 * next SCB is at the head now.
 */
static void
megaraid_mbox_runpendq(adapter_t *adapter, scb_t *scb_q)
{
	scb_t			*scb;
	unsigned long		flags;

	spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);

	if (scb_q) {
		scb_q->state = SCB_PENDQ;
		list_add_tail(&scb_q->list, &adapter->pend_list);
	}

	// if the adapter in not in quiescent mode, post the commands to FW
	if (adapter->quiescent) {
		spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
		return;
	}

	while (!list_empty(&adapter->pend_list)) {

		assert_spin_locked(PENDING_LIST_LOCK(adapter));

		scb = list_entry(adapter->pend_list.next, scb_t, list);

		// remove the scb from the pending list and try to
		// issue. If we are unable to issue it, put back in
		// the pending list and return

		list_del_init(&scb->list);

		spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);

		// if mailbox was busy, return SCB back to pending
		// list. Make sure to add at the head, since that's
		// where it would have been removed from

		scb->state = SCB_ISSUED;

		if (mbox_post_cmd(adapter, scb) != 0) {

			spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);

			scb->state = SCB_PENDQ;

			list_add(&scb->list, &adapter->pend_list);

			spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter),
				flags);

			return;
		}

		spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
	}

	spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);


	return;
}


/**
 * megaraid_mbox_prepare_pthru - prepare a command for physical devices
 * @adapter	: pointer to controller's soft state
 * @scb		: scsi control block
 * @scp		: scsi command from the mid-layer
 *
 * Prepare a command for the scsi physical devices.
 */
static void
megaraid_mbox_prepare_pthru(adapter_t *adapter, scb_t *scb,
		struct scsi_cmnd *scp)
{
	mbox_ccb_t		*ccb;
	mraid_passthru_t	*pthru;
	uint8_t			channel;
	uint8_t			target;

	ccb	= (mbox_ccb_t *)scb->ccb;
	pthru	= ccb->pthru;
	channel	= scb->dev_channel;
	target	= scb->dev_target;

	// 0=6sec, 1=60sec, 2=10min, 3=3hrs, 4=NO timeout
	pthru->timeout		= 4;	
	pthru->ars		= 1;
	pthru->islogical	= 0;
	pthru->channel		= 0;
	pthru->target		= (channel << 4) | target;
	pthru->logdrv		= SCP2LUN(scp);
	pthru->reqsenselen	= 14;
	pthru->cdblen		= scp->cmd_len;

	memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);

	if (scsi_bufflen(scp)) {
		pthru->dataxferlen	= scsi_bufflen(scp);
		pthru->dataxferaddr	= ccb->sgl_dma_h;
		pthru->numsge		= megaraid_mbox_mksgl(adapter, scb);
	}
	else {
		pthru->dataxferaddr	= 0;
		pthru->dataxferlen	= 0;
		pthru->numsge		= 0;
	}
	return;
}


/**
 * megaraid_mbox_prepare_epthru - prepare a command for physical devices
 * @adapter	: pointer to controller's soft state
 * @scb		: scsi control block
 * @scp		: scsi command from the mid-layer
 *
 * Prepare a command for the scsi physical devices. This rountine prepares
 * commands for devices which can take extended CDBs (>10 bytes).
 */
static void
megaraid_mbox_prepare_epthru(adapter_t *adapter, scb_t *scb,
		struct scsi_cmnd *scp)
{
	mbox_ccb_t		*ccb;
	mraid_epassthru_t	*epthru;
	uint8_t			channel;
	uint8_t			target;

	ccb	= (mbox_ccb_t *)scb->ccb;
	epthru	= ccb->epthru;
	channel	= scb->dev_channel;
	target	= scb->dev_target;

	// 0=6sec, 1=60sec, 2=10min, 3=3hrs, 4=NO timeout
	epthru->timeout		= 4;	
	epthru->ars		= 1;
	epthru->islogical	= 0;
	epthru->channel		= 0;
	epthru->target		= (channel << 4) | target;
	epthru->logdrv		= SCP2LUN(scp);
	epthru->reqsenselen	= 14;
	epthru->cdblen		= scp->cmd_len;

	memcpy(epthru->cdb, scp->cmnd, scp->cmd_len);

	if (scsi_bufflen(scp)) {
		epthru->dataxferlen	= scsi_bufflen(scp);
		epthru->dataxferaddr	= ccb->sgl_dma_h;
		epthru->numsge		= megaraid_mbox_mksgl(adapter, scb);
	}
	else {
		epthru->dataxferaddr	= 0;
		epthru->dataxferlen	= 0;
		epthru->numsge		= 0;
	}
	return;
}


/**
 * megaraid_ack_sequence - interrupt ack sequence for memory mapped HBAs
 * @adapter	: controller's soft state
 *
 * Interrupt acknowledgement sequence for memory mapped HBAs. Find out the
 * completed command and put them on the completed list for later processing.
 *
 * Returns:	1 if the interrupt is valid, 0 otherwise
 */
static int
megaraid_ack_sequence(adapter_t *adapter)
{
	mraid_device_t		*raid_dev = ADAP2RAIDDEV(adapter);
	mbox_t			*mbox;
	scb_t			*scb;
	uint8_t			nstatus;
	uint8_t			completed[MBOX_MAX_FIRMWARE_STATUS];
	struct list_head	clist;
	int			handled;
	uint32_t		dword;
	unsigned long		flags;
	int			i, j;


	mbox	= raid_dev->mbox;

	// move the SCBs from the firmware completed array to our local list
	INIT_LIST_HEAD(&clist);

	// loop till F/W has more commands for us to complete
	handled = 0;
	spin_lock_irqsave(MAILBOX_LOCK(raid_dev), flags);
	do {
		/*
		 * Check if a valid interrupt is pending. If found, force the
		 * interrupt line low.
		 */
		dword = RDOUTDOOR(raid_dev);
		if (dword != 0x10001234) break;

		handled = 1;

		WROUTDOOR(raid_dev, 0x10001234);

		nstatus = 0;
		// wait for valid numstatus to post
		for (i = 0; i < 0xFFFFF; i++) {
			if (mbox->numstatus != 0xFF) {
				nstatus = mbox->numstatus;
				break;
			}
			rmb();
		}
		mbox->numstatus = 0xFF;

		adapter->outstanding_cmds -= nstatus;

		for (i = 0; i < nstatus; i++) {

			// wait for valid command index to post
			for (j = 0; j < 0xFFFFF; j++) {
				if (mbox->completed[i] != 0xFF) break;
				rmb();
			}
			completed[i]		= mbox->completed[i];
			mbox->completed[i]	= 0xFF;

			if (completed[i] == 0xFF) {
				con_log(CL_ANN, (KERN_CRIT
				"megaraid: command posting timed out\n"));

				BUG();
				continue;
			}

			// Get SCB associated with this command id
			if (completed[i] >= MBOX_MAX_SCSI_CMDS) {
				// a cmm command
				scb = adapter->uscb_list + (completed[i] -
						MBOX_MAX_SCSI_CMDS);
			}
			else {
				// an os command
				scb = adapter->kscb_list + completed[i];
			}

			scb->status = mbox->status;
			list_add_tail(&scb->list, &clist);
		}

		// Acknowledge interrupt
		WRINDOOR(raid_dev, 0x02);

	} while(1);

	spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);


	// put the completed commands in the completed list. DPC would
	// complete these commands later
	spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);

	list_splice(&clist, &adapter->completed_list);

	spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);


	// schedule the DPC if there is some work for it
	if (handled)
		tasklet_schedule(&adapter->dpc_h);

	return handled;
}


/**
 * megaraid_isr - isr for memory based mailbox based controllers
 * @irq		: irq
 * @devp	: pointer to our soft state
 *
 * Interrupt service routine for memory-mapped mailbox controllers.
 */
static irqreturn_t
megaraid_isr(int irq, void *devp)
{
	adapter_t	*adapter = devp;
	int		handled;

	handled = megaraid_ack_sequence(adapter);

	/* Loop through any pending requests */
	if (!adapter->quiescent) {
		megaraid_mbox_runpendq(adapter, NULL);
	}

	return IRQ_RETVAL(handled);
}


/**
 * megaraid_mbox_sync_scb - sync kernel buffers
 * @adapter	: controller's soft state
 * @scb		: pointer to the resource packet
 *
 * DMA sync if required.
 */
static void
megaraid_mbox_sync_scb(adapter_t *adapter, scb_t *scb)
{
	mbox_ccb_t	*ccb;

	ccb	= (mbox_ccb_t *)scb->ccb;

	if (scb->dma_direction == PCI_DMA_FROMDEVICE)
		pci_dma_sync_sg_for_cpu(adapter->pdev,
					scsi_sglist(scb->scp),
					scsi_sg_count(scb->scp),
					PCI_DMA_FROMDEVICE);

	scsi_dma_unmap(scb->scp);
	return;
}


/**
 * megaraid_mbox_dpc - the tasklet to complete the commands from completed list
 * @devp	: pointer to HBA soft state
 *
 * Pick up the commands from the completed list and send back to the owners.
 * This is a reentrant function and does not assume any locks are held while
 * it is being called.
 */
static void
megaraid_mbox_dpc(unsigned long devp)
{
	adapter_t		*adapter = (adapter_t *)devp;
	mraid_device_t		*raid_dev;
	struct list_head	clist;
	struct scatterlist	*sgl;
	scb_t			*scb;
	scb_t			*tmp;
	struct scsi_cmnd	*scp;
	mraid_passthru_t	*pthru;
	mraid_epassthru_t	*epthru;
	mbox_ccb_t		*ccb;
	int			islogical;
	int			pdev_index;
	int			pdev_state;
	mbox_t			*mbox;
	unsigned long		flags;
	uint8_t			c;
	int			status;
	uioc_t			*kioc;


	if (!adapter) return;

	raid_dev = ADAP2RAIDDEV(adapter);

	// move the SCBs from the completed list to our local list
	INIT_LIST_HEAD(&clist);

	spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);

	list_splice_init(&adapter->completed_list, &clist);

	spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);


	list_for_each_entry_safe(scb, tmp, &clist, list) {

		status		= scb->status;
		scp		= scb->scp;
		ccb		= (mbox_ccb_t *)scb->ccb;
		pthru		= ccb->pthru;
		epthru		= ccb->epthru;
		mbox		= ccb->mbox;

		// Make sure f/w has completed a valid command
		if (scb->state != SCB_ISSUED) {
			con_log(CL_ANN, (KERN_CRIT
			"megaraid critical err: invalid command %d:%d:%p\n",
				scb->sno, scb->state, scp));
			BUG();
			continue;	// Must never happen!
		}

		// check for the management command and complete it right away
		if (scb->sno >= MBOX_MAX_SCSI_CMDS) {
			scb->state	= SCB_FREE;
			scb->status	= status;

			// remove from local clist
			list_del_init(&scb->list);

			kioc			= (uioc_t *)scb->gp;
			kioc->status		= 0;

			megaraid_mbox_mm_done(adapter, scb);

			continue;
		}

		// Was an abort issued for this command earlier
		if (scb->state & SCB_ABORT) {
			con_log(CL_ANN, (KERN_NOTICE
			"megaraid: aborted cmd %lx[%x] completed\n",
				scp->serial_number, scb->sno));
		}

		/*
		 * If the inquiry came of a disk drive which is not part of
		 * any RAID array, expose it to the kernel. For this to be
		 * enabled, user must set the "megaraid_expose_unconf_disks"
		 * flag to 1 by specifying it on module parameter list.
		 * This would enable data migration off drives from other
		 * configurations.
		 */
		islogical = MRAID_IS_LOGICAL(adapter, scp);
		if (scp->cmnd[0] == INQUIRY && status == 0 && islogical == 0
				&& IS_RAID_CH(raid_dev, scb->dev_channel)) {

			sgl = scsi_sglist(scp);
			if (sg_page(sgl)) {
				c = *(unsigned char *) sg_virt(&sgl[0]);
			} else {
				con_log(CL_ANN, (KERN_WARNING
						 "megaraid mailbox: invalid sg:%d\n",
						 __LINE__));
				c = 0;
			}

			if ((c & 0x1F ) == TYPE_DISK) {
				pdev_index = (scb->dev_channel * 16) +
					scb->dev_target;
				pdev_state =
					raid_dev->pdrv_state[pdev_index] & 0x0F;

				if (pdev_state == PDRV_ONLINE		||
					pdev_state == PDRV_FAILED	||
					pdev_state == PDRV_RBLD		||
					pdev_state == PDRV_HOTSPARE	||
					megaraid_expose_unconf_disks == 0) {

					status = 0xF0;
				}
			}
		}

		// Convert MegaRAID status to Linux error code
		switch (status) {

		case 0x00:

			scp->result = (DID_OK << 16);
			break;

		case 0x02:

			/* set sense_buffer and result fields */
			if (mbox->cmd == MBOXCMD_PASSTHRU ||
				mbox->cmd == MBOXCMD_PASSTHRU64) {

				memcpy(scp->sense_buffer, pthru->reqsensearea,
						14);

				scp->result = DRIVER_SENSE << 24 |
					DID_OK << 16 | CHECK_CONDITION << 1;
			}
			else {
				if (mbox->cmd == MBOXCMD_EXTPTHRU) {

					memcpy(scp->sense_buffer,
						epthru->reqsensearea, 14);

					scp->result = DRIVER_SENSE << 24 |
						DID_OK << 16 |
						CHECK_CONDITION << 1;
				} else {
					scp->sense_buffer[0] = 0x70;
					scp->sense_buffer[2] = ABORTED_COMMAND;
					scp->result = CHECK_CONDITION << 1;
				}
			}
			break;

		case 0x08:

			scp->result = DID_BUS_BUSY << 16 | status;
			break;

		default:

			/*
			 * If TEST_UNIT_READY fails, we know RESERVATION_STATUS
			 * failed
			 */
			if (scp->cmnd[0] == TEST_UNIT_READY) {
				scp->result = DID_ERROR << 16 |
					RESERVATION_CONFLICT << 1;
			}
			else
			/*
			 * Error code returned is 1 if Reserve or Release
			 * failed or the input parameter is invalid
			 */
			if (status == 1 && (scp->cmnd[0] == RESERVE ||
					 scp->cmnd[0] == RELEASE)) {

				scp->result = DID_ERROR << 16 |
					RESERVATION_CONFLICT << 1;
			}
			else {
				scp->result = DID_BAD_TARGET << 16 | status;
			}
		}

		// print a debug message for all failed commands
		if (status) {
			megaraid_mbox_display_scb(adapter, scb);
		}

		// Free our internal resources and call the mid-layer callback
		// routine
		megaraid_mbox_sync_scb(adapter, scb);

		// remove from local clist
		list_del_init(&scb->list);

		// put back in free list
		megaraid_dealloc_scb(adapter, scb);

		// send the scsi packet back to kernel
		scp->scsi_done(scp);
	}

	return;
}


/**
 * megaraid_abort_handler - abort the scsi command
 * @scp		: command to be aborted
 *
 * Abort a previous SCSI request. Only commands on the pending list can be
 * aborted. All the commands issued to the F/W must complete.
 **/
static int
megaraid_abort_handler(struct scsi_cmnd *scp)
{
	adapter_t		*adapter;
	mraid_device_t		*raid_dev;
	scb_t			*scb;
	scb_t			*tmp;
	int			found;
	unsigned long		flags;
	int			i;


	adapter		= SCP2ADAPTER(scp);
	raid_dev	= ADAP2RAIDDEV(adapter);

	con_log(CL_ANN, (KERN_WARNING
		"megaraid: aborting-%ld cmd=%x <c=%d t=%d l=%d>\n",
		scp->serial_number, scp->cmnd[0], SCP2CHANNEL(scp),
		SCP2TARGET(scp), SCP2LUN(scp)));

	// If FW has stopped responding, simply return failure
	if (raid_dev->hw_error) {
		con_log(CL_ANN, (KERN_NOTICE
			"megaraid: hw error, not aborting\n"));
		return FAILED;
	}

	// There might a race here, where the command was completed by the
	// firmware and now it is on the completed list. Before we could
	// complete the command to the kernel in dpc, the abort came.
	// Find out if this is the case to avoid the race.
	scb = NULL;
	spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
	list_for_each_entry_safe(scb, tmp, &adapter->completed_list, list) {

		if (scb->scp == scp) {	// Found command

			list_del_init(&scb->list);	// from completed list

			con_log(CL_ANN, (KERN_WARNING
			"megaraid: %ld:%d[%d:%d], abort from completed list\n",
				scp->serial_number, scb->sno,
				scb->dev_channel, scb->dev_target));

			scp->result = (DID_ABORT << 16);
			scp->scsi_done(scp);

			megaraid_dealloc_scb(adapter, scb);

			spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter),
				flags);

			return SUCCESS;
		}
	}
	spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);


	// Find out if this command is still on the pending list. If it is and
	// was never issued, abort and return success. If the command is owned
	// by the firmware, we must wait for it to complete by the FW.
	spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
	list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {

		if (scb->scp == scp) {	// Found command

			list_del_init(&scb->list);	// from pending list

			ASSERT(!(scb->state & SCB_ISSUED));

			con_log(CL_ANN, (KERN_WARNING
				"megaraid abort: %ld[%d:%d], driver owner\n",
				scp->serial_number, scb->dev_channel,
				scb->dev_target));

			scp->result = (DID_ABORT << 16);
			scp->scsi_done(scp);

			megaraid_dealloc_scb(adapter, scb);

			spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter),
				flags);

			return SUCCESS;
		}
	}
	spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);


	// Check do we even own this command, in which case this would be
	// owned by the firmware. The only way to locate the FW scb is to
	// traverse through the list of all SCB, since driver does not
	// maintain these SCBs on any list
	found = 0;
	spin_lock_irq(&adapter->lock);
	for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
		scb = adapter->kscb_list + i;

		if (scb->scp == scp) {

			found = 1;

			if (!(scb->state & SCB_ISSUED)) {
				con_log(CL_ANN, (KERN_WARNING
				"megaraid abort: %ld%d[%d:%d], invalid state\n",
				scp->serial_number, scb->sno, scb->dev_channel,
				scb->dev_target));
				BUG();
			}
			else {
				con_log(CL_ANN, (KERN_WARNING
				"megaraid abort: %ld:%d[%d:%d], fw owner\n",
				scp->serial_number, scb->sno, scb->dev_channel,
				scb->dev_target));
			}
		}
	}
	spin_unlock_irq(&adapter->lock);

	if (!found) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid abort: scsi cmd:%ld, do now own\n",
			scp->serial_number));

		// FIXME: Should there be a callback for this command?
		return SUCCESS;
	}

	// We cannot actually abort a command owned by firmware, return
	// failure and wait for reset. In host reset handler, we will find out
	// if the HBA is still live
	return FAILED;
}

/**
 * megaraid_reset_handler - device reset hadler for mailbox based driver
 * @scp		: reference command
 *
 * Reset handler for the mailbox based controller. First try to find out if
 * the FW is still live, in which case the outstanding commands counter mut go
 * down to 0. If that happens, also issue the reservation reset command to
 * relinquish (possible) reservations on the logical drives connected to this
 * host.
 **/
static int
megaraid_reset_handler(struct scsi_cmnd *scp)
{
	adapter_t	*adapter;
	scb_t		*scb;
	scb_t		*tmp;
	mraid_device_t	*raid_dev;
	unsigned long	flags;
	uint8_t		raw_mbox[sizeof(mbox_t)];
	int		rval;
	int		recovery_window;
	int		recovering;
	int		i;
	uioc_t		*kioc;

	adapter		= SCP2ADAPTER(scp);
	raid_dev	= ADAP2RAIDDEV(adapter);

	// return failure if adapter is not responding
	if (raid_dev->hw_error) {
		con_log(CL_ANN, (KERN_NOTICE
			"megaraid: hw error, cannot reset\n"));
		return FAILED;
	}


	// Under exceptional conditions, FW can take up to 3 minutes to
	// complete command processing. Wait for additional 2 minutes for the
	// pending commands counter to go down to 0. If it doesn't, let the
	// controller be marked offline
	// Also, reset all the commands currently owned by the driver
	spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
	list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {
		list_del_init(&scb->list);	// from pending list

		if (scb->sno >= MBOX_MAX_SCSI_CMDS) {
			con_log(CL_ANN, (KERN_WARNING
			"megaraid: IOCTL packet with %d[%d:%d] being reset\n",
			scb->sno, scb->dev_channel, scb->dev_target));

			scb->status = -1;

			kioc			= (uioc_t *)scb->gp;
			kioc->status		= -EFAULT;

			megaraid_mbox_mm_done(adapter, scb);
		} else {
			if (scb->scp == scp) {	// Found command
				con_log(CL_ANN, (KERN_WARNING
					"megaraid: %ld:%d[%d:%d], reset from pending list\n",
					scp->serial_number, scb->sno,
					scb->dev_channel, scb->dev_target));
			} else {
				con_log(CL_ANN, (KERN_WARNING
				"megaraid: IO packet with %d[%d:%d] being reset\n",
				scb->sno, scb->dev_channel, scb->dev_target));
			}

			scb->scp->result = (DID_RESET << 16);
			scb->scp->scsi_done(scb->scp);

			megaraid_dealloc_scb(adapter, scb);
		}
	}
	spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);

	if (adapter->outstanding_cmds) {
		con_log(CL_ANN, (KERN_NOTICE
			"megaraid: %d outstanding commands. Max wait %d sec\n",
			adapter->outstanding_cmds,
			(MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT)));
	}

	recovery_window = MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT;

	recovering = adapter->outstanding_cmds;

	for (i = 0; i < recovery_window; i++) {

		megaraid_ack_sequence(adapter);

		// print a message once every 5 seconds only
		if (!(i % 5)) {
			con_log(CL_ANN, (
			"megaraid mbox: Wait for %d commands to complete:%d\n",
				adapter->outstanding_cmds,
				(MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT) - i));
		}

		// bailout if no recovery happended in reset time
		if (adapter->outstanding_cmds == 0) {
			break;
		}

		msleep(1000);
	}

	spin_lock(&adapter->lock);

	// If still outstanding commands, bail out
	if (adapter->outstanding_cmds) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid mbox: critical hardware error!\n"));

		raid_dev->hw_error = 1;

		rval = FAILED;
		goto out;
	}
	else {
		con_log(CL_ANN, (KERN_NOTICE
		"megaraid mbox: reset sequence completed sucessfully\n"));
	}


	// If the controller supports clustering, reset reservations
	if (!adapter->ha) {
		rval = SUCCESS;
		goto out;
	}

	// clear reservations if any
	raw_mbox[0] = CLUSTER_CMD;
	raw_mbox[2] = RESET_RESERVATIONS;

	rval = SUCCESS;
	if (mbox_post_sync_cmd_fast(adapter, raw_mbox) == 0) {
		con_log(CL_ANN,
			(KERN_INFO "megaraid: reservation reset\n"));
	}
	else {
		rval = FAILED;
		con_log(CL_ANN, (KERN_WARNING
				"megaraid: reservation reset failed\n"));
	}

 out:
	spin_unlock_irq(&adapter->lock);
	return rval;
}

/*
 * START: internal commands library
 *
 * This section of the driver has the common routine used by the driver and
 * also has all the FW routines
 */

/**
 * mbox_post_sync_cmd() - blocking command to the mailbox based controllers
 * @adapter	: controller's soft state
 * @raw_mbox	: the mailbox
 *
 * Issue a scb in synchronous and non-interrupt mode for mailbox based
 * controllers.
 */
static int
mbox_post_sync_cmd(adapter_t *adapter, uint8_t raw_mbox[])
{
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	mbox64_t	*mbox64;
	mbox_t		*mbox;
	uint8_t		status;
	int		i;


	mbox64	= raid_dev->mbox64;
	mbox	= raid_dev->mbox;

	/*
	 * Wait until mailbox is free
	 */
	if (megaraid_busywait_mbox(raid_dev) != 0)
		goto blocked_mailbox;

	/*
	 * Copy mailbox data into host structure
	 */
	memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 16);
	mbox->cmdid		= 0xFE;
	mbox->busy		= 1;
	mbox->poll		= 0;
	mbox->ack		= 0;
	mbox->numstatus		= 0xFF;
	mbox->status		= 0xFF;

	wmb();
	WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);

	// wait for maximum 1 second for status to post. If the status is not
	// available within 1 second, assume FW is initializing and wait
	// for an extended amount of time
	if (mbox->numstatus == 0xFF) {	// status not yet available
		udelay(25);

		for (i = 0; mbox->numstatus == 0xFF && i < 1000; i++) {
			rmb();
			msleep(1);
		}


		if (i == 1000) {
			con_log(CL_ANN, (KERN_NOTICE
				"megaraid mailbox: wait for FW to boot      "));

			for (i = 0; (mbox->numstatus == 0xFF) &&
					(i < MBOX_RESET_WAIT); i++) {
				rmb();
				con_log(CL_ANN, ("\b\b\b\b\b[%03d]",
							MBOX_RESET_WAIT - i));
				msleep(1000);
			}

			if (i == MBOX_RESET_WAIT) {

				con_log(CL_ANN, (
				"\nmegaraid mailbox: status not available\n"));

				return -1;
			}
			con_log(CL_ANN, ("\b\b\b\b\b[ok] \n"));
		}
	}

	// wait for maximum 1 second for poll semaphore
	if (mbox->poll != 0x77) {
		udelay(25);

		for (i = 0; (mbox->poll != 0x77) && (i < 1000); i++) {
			rmb();
			msleep(1);
		}

		if (i == 1000) {
			con_log(CL_ANN, (KERN_WARNING
			"megaraid mailbox: could not get poll semaphore\n"));
			return -1;
		}
	}

	WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x2);
	wmb();

	// wait for maximum 1 second for acknowledgement
	if (RDINDOOR(raid_dev) & 0x2) {
		udelay(25);

		for (i = 0; (RDINDOOR(raid_dev) & 0x2) && (i < 1000); i++) {
			rmb();
			msleep(1);
		}

		if (i == 1000) {
			con_log(CL_ANN, (KERN_WARNING
				"megaraid mailbox: could not acknowledge\n"));
			return -1;
		}
	}
	mbox->poll	= 0;
	mbox->ack	= 0x77;

	status = mbox->status;

	// invalidate the completed command id array. After command
	// completion, firmware would write the valid id.
	mbox->numstatus	= 0xFF;
	mbox->status	= 0xFF;
	for (i = 0; i < MBOX_MAX_FIRMWARE_STATUS; i++) {
		mbox->completed[i] = 0xFF;
	}

	return status;

blocked_mailbox:

	con_log(CL_ANN, (KERN_WARNING "megaraid: blocked mailbox\n") );
	return -1;
}


/**
 * mbox_post_sync_cmd_fast - blocking command to the mailbox based controllers
 * @adapter	: controller's soft state
 * @raw_mbox	: the mailbox
 *
 * Issue a scb in synchronous and non-interrupt mode for mailbox based
 * controllers. This is a faster version of the synchronous command and
 * therefore can be called in interrupt-context as well.
 */
static int
mbox_post_sync_cmd_fast(adapter_t *adapter, uint8_t raw_mbox[])
{
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	mbox_t		*mbox;
	long		i;


	mbox	= raid_dev->mbox;

	// return immediately if the mailbox is busy
	if (mbox->busy) return -1;

	// Copy mailbox data into host structure
	memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 14);
	mbox->cmdid		= 0xFE;
	mbox->busy		= 1;
	mbox->poll		= 0;
	mbox->ack		= 0;
	mbox->numstatus		= 0xFF;
	mbox->status		= 0xFF;

	wmb();
	WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);

	for (i = 0; i < MBOX_SYNC_WAIT_CNT; i++) {
		if (mbox->numstatus != 0xFF) break;
		rmb();
		udelay(MBOX_SYNC_DELAY_200);
	}

	if (i == MBOX_SYNC_WAIT_CNT) {
		// We may need to re-calibrate the counter
		con_log(CL_ANN, (KERN_CRIT
			"megaraid: fast sync command timed out\n"));
	}

	WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x2);
	wmb();

	return mbox->status;
}


/**
 * megaraid_busywait_mbox() - Wait until the controller's mailbox is available
 * @raid_dev	: RAID device (HBA) soft state
 *
 * Wait until the controller's mailbox is available to accept more commands.
 * Wait for at most 1 second.
 */
static int
megaraid_busywait_mbox(mraid_device_t *raid_dev)
{
	mbox_t	*mbox = raid_dev->mbox;
	int	i = 0;

	if (mbox->busy) {
		udelay(25);
		for (i = 0; mbox->busy && i < 1000; i++)
			msleep(1);
	}

	if (i < 1000) return 0;
	else return -1;
}


/**
 * megaraid_mbox_product_info - some static information about the controller
 * @adapter	: our soft state
 *
 * Issue commands to the controller to grab some parameters required by our
 * caller.
 */
static int
megaraid_mbox_product_info(adapter_t *adapter)
{
	mraid_device_t		*raid_dev = ADAP2RAIDDEV(adapter);
	mbox_t			*mbox;
	uint8_t			raw_mbox[sizeof(mbox_t)];
	mraid_pinfo_t		*pinfo;
	dma_addr_t		pinfo_dma_h;
	mraid_inquiry3_t	*mraid_inq3;
	int			i;


	memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
	mbox = (mbox_t *)raw_mbox;

	/*
	 * Issue an ENQUIRY3 command to find out certain adapter parameters,
	 * e.g., max channels, max commands etc.
	 */
	pinfo = pci_alloc_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
			&pinfo_dma_h);

	if (pinfo == NULL) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));

		return -1;
	}
	memset(pinfo, 0, sizeof(mraid_pinfo_t));

	mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
	memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);

	raw_mbox[0] = FC_NEW_CONFIG;
	raw_mbox[2] = NC_SUBOP_ENQUIRY3;
	raw_mbox[3] = ENQ3_GET_SOLICITED_FULL;

	// Issue the command
	if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {

		con_log(CL_ANN, (KERN_WARNING "megaraid: Inquiry3 failed\n"));

		pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
			pinfo, pinfo_dma_h);

		return -1;
	}

	/*
	 * Collect information about state of each physical drive
	 * attached to the controller. We will expose all the disks
	 * which are not part of RAID
	 */
	mraid_inq3 = (mraid_inquiry3_t *)adapter->ibuf;
	for (i = 0; i < MBOX_MAX_PHYSICAL_DRIVES; i++) {
		raid_dev->pdrv_state[i] = mraid_inq3->pdrv_state[i];
	}

	/*
	 * Get product info for information like number of channels,
	 * maximum commands supported.
	 */
	memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
	mbox->xferaddr = (uint32_t)pinfo_dma_h;

	raw_mbox[0] = FC_NEW_CONFIG;
	raw_mbox[2] = NC_SUBOP_PRODUCT_INFO;

	if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid: product info failed\n"));

		pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
			pinfo, pinfo_dma_h);

		return -1;
	}

	/*
	 * Setup some parameters for host, as required by our caller
	 */
	adapter->max_channel = pinfo->nchannels;

	/*
	 * we will export all the logical drives on a single channel.
	 * Add 1 since inquires do not come for inititor ID
	 */
	adapter->max_target	= MAX_LOGICAL_DRIVES_40LD + 1;
	adapter->max_lun	= 8;	// up to 8 LUNs for non-disk devices

	/*
	 * These are the maximum outstanding commands for the scsi-layer
	 */
	adapter->max_cmds	= MBOX_MAX_SCSI_CMDS;

	memset(adapter->fw_version, 0, VERSION_SIZE);
	memset(adapter->bios_version, 0, VERSION_SIZE);

	memcpy(adapter->fw_version, pinfo->fw_version, 4);
	adapter->fw_version[4] = 0;

	memcpy(adapter->bios_version, pinfo->bios_version, 4);
	adapter->bios_version[4] = 0;

	con_log(CL_ANN, (KERN_NOTICE
		"megaraid: fw version:[%s] bios version:[%s]\n",
		adapter->fw_version, adapter->bios_version));

	pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t), pinfo,
			pinfo_dma_h);

	return 0;
}



/**
 * megaraid_mbox_extended_cdb - check for support for extended CDBs
 * @adapter	: soft state for the controller
 *
 * This routine check whether the controller in question supports extended
 * ( > 10 bytes ) CDBs.
 */
static int
megaraid_mbox_extended_cdb(adapter_t *adapter)
{
	mbox_t		*mbox;
	uint8_t		raw_mbox[sizeof(mbox_t)];
	int		rval;

	mbox = (mbox_t *)raw_mbox;

	memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
	mbox->xferaddr	= (uint32_t)adapter->ibuf_dma_h;

	memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);

	raw_mbox[0] = MAIN_MISC_OPCODE;
	raw_mbox[2] = SUPPORT_EXT_CDB;

	/*
	 * Issue the command
	 */
	rval = 0;
	if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
		rval = -1;
	}

	return rval;
}


/**
 * megaraid_mbox_support_ha - Do we support clustering
 * @adapter	: soft state for the controller
 * @init_id	: ID of the initiator
 *
 * Determine if the firmware supports clustering and the ID of the initiator.
 */
static int
megaraid_mbox_support_ha(adapter_t *adapter, uint16_t *init_id)
{
	mbox_t		*mbox;
	uint8_t		raw_mbox[sizeof(mbox_t)];
	int		rval;


	mbox = (mbox_t *)raw_mbox;

	memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));

	mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;

	memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);

	raw_mbox[0] = GET_TARGET_ID;

	// Issue the command
	*init_id = 7;
	rval =  -1;
	if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {

		*init_id = *(uint8_t *)adapter->ibuf;

		con_log(CL_ANN, (KERN_INFO
			"megaraid: cluster firmware, initiator ID: %d\n",
			*init_id));

		rval =  0;
	}

	return rval;
}


/**
 * megaraid_mbox_support_random_del - Do we support random deletion
 * @adapter	: soft state for the controller
 *
 * Determine if the firmware supports random deletion.
 * Return:	1 is operation supported, 0 otherwise
 */
static int
megaraid_mbox_support_random_del(adapter_t *adapter)
{
	mbox_t		*mbox;
	uint8_t		raw_mbox[sizeof(mbox_t)];
	int		rval;


	mbox = (mbox_t *)raw_mbox;

	memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));

	raw_mbox[0] = FC_DEL_LOGDRV;
	raw_mbox[2] = OP_SUP_DEL_LOGDRV;

	// Issue the command
	rval = 0;
	if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {

		con_log(CL_DLEVEL1, ("megaraid: supports random deletion\n"));

		rval =  1;
	}

	return rval;
}


/**
 * megaraid_mbox_get_max_sg - maximum sg elements supported by the firmware
 * @adapter	: soft state for the controller
 *
 * Find out the maximum number of scatter-gather elements supported by the
 * firmware.
 */
static int
megaraid_mbox_get_max_sg(adapter_t *adapter)
{
	mbox_t		*mbox;
	uint8_t		raw_mbox[sizeof(mbox_t)];
	int		nsg;


	mbox = (mbox_t *)raw_mbox;

	memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));

	mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;

	memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);

	raw_mbox[0] = MAIN_MISC_OPCODE;
	raw_mbox[2] = GET_MAX_SG_SUPPORT;

	// Issue the command
	if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
		nsg =  *(uint8_t *)adapter->ibuf;
	}
	else {
		nsg =  MBOX_DEFAULT_SG_SIZE;
	}

	if (nsg > MBOX_MAX_SG_SIZE) nsg = MBOX_MAX_SG_SIZE;

	return nsg;
}


/**
 * megaraid_mbox_enum_raid_scsi - enumerate the RAID and SCSI channels
 * @adapter	: soft state for the controller
 *
 * Enumerate the RAID and SCSI channels for ROMB platforms so that channels
 * can be exported as regular SCSI channels.
 */
static void
megaraid_mbox_enum_raid_scsi(adapter_t *adapter)
{
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	mbox_t		*mbox;
	uint8_t		raw_mbox[sizeof(mbox_t)];


	mbox = (mbox_t *)raw_mbox;

	memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));

	mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;

	memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);

	raw_mbox[0] = CHNL_CLASS;
	raw_mbox[2] = GET_CHNL_CLASS;

	// Issue the command. If the command fails, all channels are RAID
	// channels
	raid_dev->channel_class = 0xFF;
	if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
		raid_dev->channel_class =  *(uint8_t *)adapter->ibuf;
	}

	return;
}


/**
 * megaraid_mbox_flush_cache - flush adapter and disks cache
 * @adapter		: soft state for the controller
 *
 * Flush adapter cache followed by disks cache.
 */
static void
megaraid_mbox_flush_cache(adapter_t *adapter)
{
	mbox_t	*mbox;
	uint8_t	raw_mbox[sizeof(mbox_t)];


	mbox = (mbox_t *)raw_mbox;

	memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));

	raw_mbox[0] = FLUSH_ADAPTER;

	if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
		con_log(CL_ANN, ("megaraid: flush adapter failed\n"));
	}

	raw_mbox[0] = FLUSH_SYSTEM;

	if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
		con_log(CL_ANN, ("megaraid: flush disks cache failed\n"));
	}

	return;
}


/**
 * megaraid_mbox_fire_sync_cmd - fire the sync cmd
 * @adapter		: soft state for the controller
 *
 * Clears the pending cmds in FW and reinits its RAID structs.
 */
static int
megaraid_mbox_fire_sync_cmd(adapter_t *adapter)
{
	mbox_t	*mbox;
	uint8_t	raw_mbox[sizeof(mbox_t)];
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	mbox64_t *mbox64;
	int	status = 0;
	int i;
	uint32_t dword;

	mbox = (mbox_t *)raw_mbox;

	memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));

	raw_mbox[0] = 0xFF;

	mbox64	= raid_dev->mbox64;
	mbox	= raid_dev->mbox;

	/* Wait until mailbox is free */
	if (megaraid_busywait_mbox(raid_dev) != 0) {
		status = 1;
		goto blocked_mailbox;
	}

	/* Copy mailbox data into host structure */
	memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 16);
	mbox->cmdid		= 0xFE;
	mbox->busy		= 1;
	mbox->poll		= 0;
	mbox->ack		= 0;
	mbox->numstatus		= 0;
	mbox->status		= 0;

	wmb();
	WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);

	/* Wait for maximum 1 min for status to post.
	 * If the Firmware SUPPORTS the ABOVE COMMAND,
	 * mbox->cmd will be set to 0
	 * else
	 * the firmware will reject the command with
	 * mbox->numstatus set to 1
	 */

	i = 0;
	status = 0;
	while (!mbox->numstatus && mbox->cmd == 0xFF) {
		rmb();
		msleep(1);
		i++;
		if (i > 1000 * 60) {
			status = 1;
			break;
		}
	}
	if (mbox->numstatus == 1)
		status = 1; /*cmd not supported*/

	/* Check for interrupt line */
	dword = RDOUTDOOR(raid_dev);
	WROUTDOOR(raid_dev, dword);
	WRINDOOR(raid_dev,2);

	return status;

blocked_mailbox:
	con_log(CL_ANN, (KERN_WARNING "megaraid: blocked mailbox\n"));
	return status;
}

/**
 * megaraid_mbox_display_scb - display SCB information, mostly debug purposes
 * @adapter		: controller's soft state
 * @scb			: SCB to be displayed
 * @level		: debug level for console print
 *
 * Diplay information about the given SCB iff the current debug level is
 * verbose.
 */
static void
megaraid_mbox_display_scb(adapter_t *adapter, scb_t *scb)
{
	mbox_ccb_t		*ccb;
	struct scsi_cmnd	*scp;
	mbox_t			*mbox;
	int			level;
	int			i;


	ccb	= (mbox_ccb_t *)scb->ccb;
	scp	= scb->scp;
	mbox	= ccb->mbox;

	level = CL_DLEVEL3;

	con_log(level, (KERN_NOTICE
		"megaraid mailbox: status:%#x cmd:%#x id:%#x ", scb->status,
		mbox->cmd, scb->sno));

	con_log(level, ("sec:%#x lba:%#x addr:%#x ld:%d sg:%d\n",
		mbox->numsectors, mbox->lba, mbox->xferaddr, mbox->logdrv,
		mbox->numsge));

	if (!scp) return;

	con_log(level, (KERN_NOTICE "scsi cmnd: "));

	for (i = 0; i < scp->cmd_len; i++) {
		con_log(level, ("%#2.02x ", scp->cmnd[i]));
	}

	con_log(level, ("\n"));

	return;
}


/**
 * megaraid_mbox_setup_device_map - manage device ids
 * @adapter	: Driver's soft state
 *
 * Manange the device ids to have an appropraite mapping between the kernel
 * scsi addresses and megaraid scsi and logical drive addresses. We export
 * scsi devices on their actual addresses, whereas the logical drives are
 * exported on a virtual scsi channel.
 */
static void
megaraid_mbox_setup_device_map(adapter_t *adapter)
{
	uint8_t		c;
	uint8_t		t;

	/*
	 * First fill the values on the logical drive channel
	 */
	for (t = 0; t < LSI_MAX_LOGICAL_DRIVES_64LD; t++)
		adapter->device_ids[adapter->max_channel][t] =
			(t < adapter->init_id) ?  t : t - 1;

	adapter->device_ids[adapter->max_channel][adapter->init_id] = 0xFF;

	/*
	 * Fill the values on the physical devices channels
	 */
	for (c = 0; c < adapter->max_channel; c++)
		for (t = 0; t < LSI_MAX_LOGICAL_DRIVES_64LD; t++)
			adapter->device_ids[c][t] = (c << 8) | t;
}


/*
 * END: internal commands library
 */

/*
 * START: Interface for the common management module
 *
 * This is the module, which interfaces with the common mangement module to
 * provide support for ioctl and sysfs
 */

/**
 * megaraid_cmm_register - register with the mangement module
 * @adapter		: HBA soft state
 *
 * Register with the management module, which allows applications to issue
 * ioctl calls to the drivers. This interface is used by the management module
 * to setup sysfs support as well.
 */
static int
megaraid_cmm_register(adapter_t *adapter)
{
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	mraid_mmadp_t	adp;
	scb_t		*scb;
	mbox_ccb_t	*ccb;
	int		rval;
	int		i;

	// Allocate memory for the base list of scb for management module.
	adapter->uscb_list = kcalloc(MBOX_MAX_USER_CMDS, sizeof(scb_t), GFP_KERNEL);

	if (adapter->uscb_list == NULL) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));
		return -1;
	}


	// Initialize the synchronization parameters for resources for
	// commands for management module
	INIT_LIST_HEAD(&adapter->uscb_pool);

	spin_lock_init(USER_FREE_LIST_LOCK(adapter));



	// link all the packets. Note, CCB for commands, coming from the
	// commom management module, mailbox physical address are already
	// setup by it. We just need placeholder for that in our local command
	// control blocks
	for (i = 0; i < MBOX_MAX_USER_CMDS; i++) {

		scb			= adapter->uscb_list + i;
		ccb			= raid_dev->uccb_list + i;

		scb->ccb		= (caddr_t)ccb;
		ccb->mbox64		= raid_dev->umbox64 + i;
		ccb->mbox		= &ccb->mbox64->mbox32;
		ccb->raw_mbox		= (uint8_t *)ccb->mbox;

		scb->gp			= 0;

		// COMMAND ID 0 - (MBOX_MAX_SCSI_CMDS-1) ARE RESERVED FOR
		// COMMANDS COMING FROM IO SUBSYSTEM (MID-LAYER)
		scb->sno		= i + MBOX_MAX_SCSI_CMDS;

		scb->scp		= NULL;
		scb->state		= SCB_FREE;
		scb->dma_direction	= PCI_DMA_NONE;
		scb->dma_type		= MRAID_DMA_NONE;
		scb->dev_channel	= -1;
		scb->dev_target		= -1;

		// put scb in the free pool
		list_add_tail(&scb->list, &adapter->uscb_pool);
	}

	adp.unique_id		= adapter->unique_id;
	adp.drvr_type		= DRVRTYPE_MBOX;
	adp.drvr_data		= (unsigned long)adapter;
	adp.pdev		= adapter->pdev;
	adp.issue_uioc		= megaraid_mbox_mm_handler;
	adp.timeout		= MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT;
	adp.max_kioc		= MBOX_MAX_USER_CMDS;

	if ((rval = mraid_mm_register_adp(&adp)) != 0) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid mbox: did not register with CMM\n"));

		kfree(adapter->uscb_list);
	}

	return rval;
}


/**
 * megaraid_cmm_unregister - un-register with the mangement module
 * @adapter		: HBA soft state
 *
 * Un-register with the management module.
 * FIXME: mgmt module must return failure for unregister if it has pending
 * commands in LLD.
 */
static int
megaraid_cmm_unregister(adapter_t *adapter)
{
	kfree(adapter->uscb_list);
	mraid_mm_unregister_adp(adapter->unique_id);
	return 0;
}


/**
 * megaraid_mbox_mm_handler - interface for CMM to issue commands to LLD
 * @drvr_data		: LLD specific data
 * @kioc		: CMM interface packet
 * @action		: command action
 *
 * This routine is invoked whenever the Common Mangement Module (CMM) has a
 * command for us. The 'action' parameter specifies if this is a new command
 * or otherwise.
 */
static int
megaraid_mbox_mm_handler(unsigned long drvr_data, uioc_t *kioc, uint32_t action)
{
	adapter_t *adapter;

	if (action != IOCTL_ISSUE) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: unsupported management action:%#2x\n",
			action));
		return (-ENOTSUPP);
	}

	adapter = (adapter_t *)drvr_data;

	// make sure this adapter is not being detached right now.
	if (atomic_read(&adapter->being_detached)) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid: reject management request, detaching\n"));
		return (-ENODEV);
	}

	switch (kioc->opcode) {

	case GET_ADAP_INFO:

		kioc->status =  gather_hbainfo(adapter, (mraid_hba_info_t *)
					(unsigned long)kioc->buf_vaddr);

		kioc->done(kioc);

		return kioc->status;

	case MBOX_CMD:

		return megaraid_mbox_mm_command(adapter, kioc);

	default:
		kioc->status = (-EINVAL);
		kioc->done(kioc);
		return (-EINVAL);
	}

	return 0;	// not reached
}

/**
 * megaraid_mbox_mm_command - issues commands routed through CMM
 * @adapter		: HBA soft state
 * @kioc		: management command packet
 *
 * Issues commands, which are routed through the management module.
 */
static int
megaraid_mbox_mm_command(adapter_t *adapter, uioc_t *kioc)
{
	struct list_head	*head = &adapter->uscb_pool;
	mbox64_t		*mbox64;
	uint8_t			*raw_mbox;
	scb_t			*scb;
	mbox_ccb_t		*ccb;
	unsigned long		flags;

	// detach one scb from free pool
	spin_lock_irqsave(USER_FREE_LIST_LOCK(adapter), flags);

	if (list_empty(head)) {	// should never happen because of CMM

		con_log(CL_ANN, (KERN_WARNING
			"megaraid mbox: bug in cmm handler, lost resources\n"));

		spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);

		return (-EINVAL);
	}

	scb = list_entry(head->next, scb_t, list);
	list_del_init(&scb->list);

	spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);

	scb->state		= SCB_ACTIVE;
	scb->dma_type		= MRAID_DMA_NONE;
	scb->dma_direction	= PCI_DMA_NONE;

	ccb		= (mbox_ccb_t *)scb->ccb;
	mbox64		= (mbox64_t *)(unsigned long)kioc->cmdbuf;
	raw_mbox	= (uint8_t *)&mbox64->mbox32;

	memcpy(ccb->mbox64, mbox64, sizeof(mbox64_t));

	scb->gp		= (unsigned long)kioc;

	/*
	 * If it is a logdrv random delete operation, we have to wait till
	 * there are no outstanding cmds at the fw and then issue it directly
	 */
	if (raw_mbox[0] == FC_DEL_LOGDRV && raw_mbox[2] == OP_DEL_LOGDRV) {

		if (wait_till_fw_empty(adapter)) {
			con_log(CL_ANN, (KERN_NOTICE
				"megaraid mbox: LD delete, timed out\n"));

			kioc->status = -ETIME;

			scb->status = -1;

			megaraid_mbox_mm_done(adapter, scb);

			return (-ETIME);
		}

		INIT_LIST_HEAD(&scb->list);

		scb->state = SCB_ISSUED;
		if (mbox_post_cmd(adapter, scb) != 0) {

			con_log(CL_ANN, (KERN_NOTICE
				"megaraid mbox: LD delete, mailbox busy\n"));

			kioc->status = -EBUSY;

			scb->status = -1;

			megaraid_mbox_mm_done(adapter, scb);

			return (-EBUSY);
		}

		return 0;
	}

	// put the command on the pending list and execute
	megaraid_mbox_runpendq(adapter, scb);

	return 0;
}


static int
wait_till_fw_empty(adapter_t *adapter)
{
	unsigned long	flags = 0;
	int		i;


	/*
	 * Set the quiescent flag to stop issuing cmds to FW.
	 */
	spin_lock_irqsave(&adapter->lock, flags);
	adapter->quiescent++;
	spin_unlock_irqrestore(&adapter->lock, flags);

	/*
	 * Wait till there are no more cmds outstanding at FW. Try for at most
	 * 60 seconds
	 */
	for (i = 0; i < 60 && adapter->outstanding_cmds; i++) {
		con_log(CL_DLEVEL1, (KERN_INFO
			"megaraid: FW has %d pending commands\n",
			adapter->outstanding_cmds));

		msleep(1000);
	}

	return adapter->outstanding_cmds;
}


/**
 * megaraid_mbox_mm_done - callback for CMM commands
 * @adapter	: HBA soft state
 * @scb		: completed command
 *
 * Callback routine for internal commands originated from the management
 * module.
 */
static void
megaraid_mbox_mm_done(adapter_t *adapter, scb_t *scb)
{
	uioc_t			*kioc;
	mbox64_t		*mbox64;
	uint8_t			*raw_mbox;
	unsigned long		flags;

	kioc			= (uioc_t *)scb->gp;
	mbox64			= (mbox64_t *)(unsigned long)kioc->cmdbuf;
	mbox64->mbox32.status	= scb->status;
	raw_mbox		= (uint8_t *)&mbox64->mbox32;


	// put scb in the free pool
	scb->state	= SCB_FREE;
	scb->scp	= NULL;

	spin_lock_irqsave(USER_FREE_LIST_LOCK(adapter), flags);

	list_add(&scb->list, &adapter->uscb_pool);

	spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);

	// if a delete logical drive operation succeeded, restart the
	// controller
	if (raw_mbox[0] == FC_DEL_LOGDRV && raw_mbox[2] == OP_DEL_LOGDRV) {

		adapter->quiescent--;

		megaraid_mbox_runpendq(adapter, NULL);
	}

	kioc->done(kioc);

	return;
}


/**
 * gather_hbainfo - HBA characteristics for the applications
 * @adapter		: HBA soft state
 * @hinfo		: pointer to the caller's host info strucuture
 */
static int
gather_hbainfo(adapter_t *adapter, mraid_hba_info_t *hinfo)
{
	uint8_t	dmajor;

	dmajor			= megaraid_mbox_version[0];

	hinfo->pci_vendor_id	= adapter->pdev->vendor;
	hinfo->pci_device_id	= adapter->pdev->device;
	hinfo->subsys_vendor_id	= adapter->pdev->subsystem_vendor;
	hinfo->subsys_device_id	= adapter->pdev->subsystem_device;

	hinfo->pci_bus		= adapter->pdev->bus->number;
	hinfo->pci_dev_fn	= adapter->pdev->devfn;
	hinfo->pci_slot		= PCI_SLOT(adapter->pdev->devfn);
	hinfo->irq		= adapter->host->irq;
	hinfo->baseport		= ADAP2RAIDDEV(adapter)->baseport;

	hinfo->unique_id	= (hinfo->pci_bus << 8) | adapter->pdev->devfn;
	hinfo->host_no		= adapter->host->host_no;

	return 0;
}

/*
 * END: Interface for the common management module
 */



/**
 * megaraid_sysfs_alloc_resources - allocate sysfs related resources
 * @adapter	: controller's soft state
 *
 * Allocate packets required to issue FW calls whenever the sysfs attributes
 * are read. These attributes would require up-to-date information from the
 * FW. Also set up resources for mutual exclusion to share these resources and
 * the wait queue.
 *
 * Return 0 on success.
 * Return -ERROR_CODE on failure.
 */
static int
megaraid_sysfs_alloc_resources(adapter_t *adapter)
{
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	int		rval = 0;

	raid_dev->sysfs_uioc = kmalloc(sizeof(uioc_t), GFP_KERNEL);

	raid_dev->sysfs_mbox64 = kmalloc(sizeof(mbox64_t), GFP_KERNEL);

	raid_dev->sysfs_buffer = pci_alloc_consistent(adapter->pdev,
			PAGE_SIZE, &raid_dev->sysfs_buffer_dma);

	if (!raid_dev->sysfs_uioc || !raid_dev->sysfs_mbox64 ||
		!raid_dev->sysfs_buffer) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));

		rval = -ENOMEM;

		megaraid_sysfs_free_resources(adapter);
	}

	mutex_init(&raid_dev->sysfs_mtx);

	init_waitqueue_head(&raid_dev->sysfs_wait_q);

	return rval;
}


/**
 * megaraid_sysfs_free_resources - free sysfs related resources
 * @adapter	: controller's soft state
 *
 * Free packets allocated for sysfs FW commands
 */
static void
megaraid_sysfs_free_resources(adapter_t *adapter)
{
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);

	kfree(raid_dev->sysfs_uioc);
	kfree(raid_dev->sysfs_mbox64);

	if (raid_dev->sysfs_buffer) {
		pci_free_consistent(adapter->pdev, PAGE_SIZE,
			raid_dev->sysfs_buffer, raid_dev->sysfs_buffer_dma);
	}
}


/**
 * megaraid_sysfs_get_ldmap_done - callback for get ldmap
 * @uioc	: completed packet
 *
 * Callback routine called in the ISR/tasklet context for get ldmap call
 */
static void
megaraid_sysfs_get_ldmap_done(uioc_t *uioc)
{
	adapter_t	*adapter = (adapter_t *)uioc->buf_vaddr;
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);

	uioc->status = 0;

	wake_up(&raid_dev->sysfs_wait_q);
}


/**
 * megaraid_sysfs_get_ldmap_timeout - timeout handling for get ldmap
 * @data	: timed out packet
 *
 * Timeout routine to recover and return to application, in case the adapter
 * has stopped responding. A timeout of 60 seconds for this command seems like
 * a good value.
 */
static void
megaraid_sysfs_get_ldmap_timeout(unsigned long data)
{
	uioc_t		*uioc = (uioc_t *)data;
	adapter_t	*adapter = (adapter_t *)uioc->buf_vaddr;
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);

	uioc->status = -ETIME;

	wake_up(&raid_dev->sysfs_wait_q);
}


/**
 * megaraid_sysfs_get_ldmap - get update logical drive map
 * @adapter	: controller's soft state
 *
 * This routine will be called whenever user reads the logical drive
 * attributes, go get the current logical drive mapping table from the
 * firmware. We use the managment API's to issue commands to the controller.
 *
 * NOTE: The commands issuance functionality is not generalized and
 * implemented in context of "get ld map" command only. If required, the
 * command issuance logical can be trivially pulled out and implemented as a
 * standalone libary. For now, this should suffice since there is no other
 * user of this interface.
 *
 * Return 0 on success.
 * Return -1 on failure.
 */
static int
megaraid_sysfs_get_ldmap(adapter_t *adapter)
{
	mraid_device_t		*raid_dev = ADAP2RAIDDEV(adapter);
	uioc_t			*uioc;
	mbox64_t		*mbox64;
	mbox_t			*mbox;
	char			*raw_mbox;
	struct timer_list	sysfs_timer;
	struct timer_list	*timerp;
	caddr_t			ldmap;
	int			rval = 0;

	/*
	 * Allow only one read at a time to go through the sysfs attributes
	 */
	mutex_lock(&raid_dev->sysfs_mtx);

	uioc	= raid_dev->sysfs_uioc;
	mbox64	= raid_dev->sysfs_mbox64;
	ldmap	= raid_dev->sysfs_buffer;

	memset(uioc, 0, sizeof(uioc_t));
	memset(mbox64, 0, sizeof(mbox64_t));
	memset(ldmap, 0, sizeof(raid_dev->curr_ldmap));

	mbox		= &mbox64->mbox32;
	raw_mbox	= (char *)mbox;
	uioc->cmdbuf    = (uint64_t)(unsigned long)mbox64;
	uioc->buf_vaddr	= (caddr_t)adapter;
	uioc->status	= -ENODATA;
	uioc->done	= megaraid_sysfs_get_ldmap_done;

	/*
	 * Prepare the mailbox packet to get the current logical drive mapping
	 * table
	 */
	mbox->xferaddr = (uint32_t)raid_dev->sysfs_buffer_dma;

	raw_mbox[0] = FC_DEL_LOGDRV;
	raw_mbox[2] = OP_GET_LDID_MAP;

	/*
	 * Setup a timer to recover from a non-responding controller
	 */
	timerp	= &sysfs_timer;
	init_timer(timerp);

	timerp->function	= megaraid_sysfs_get_ldmap_timeout;
	timerp->data		= (unsigned long)uioc;
	timerp->expires		= jiffies + 60 * HZ;

	add_timer(timerp);

	/*
	 * Send the command to the firmware
	 */
	rval = megaraid_mbox_mm_command(adapter, uioc);

	if (rval == 0) {	// command successfully issued
		wait_event(raid_dev->sysfs_wait_q, (uioc->status != -ENODATA));

		/*
		 * Check if the command timed out
		 */
		if (uioc->status == -ETIME) {
			con_log(CL_ANN, (KERN_NOTICE
				"megaraid: sysfs get ld map timed out\n"));

			rval = -ETIME;
		}
		else {
			rval = mbox->status;
		}

		if (rval == 0) {
			memcpy(raid_dev->curr_ldmap, ldmap,
				sizeof(raid_dev->curr_ldmap));
		}
		else {
			con_log(CL_ANN, (KERN_NOTICE
				"megaraid: get ld map failed with %x\n", rval));
		}
	}
	else {
		con_log(CL_ANN, (KERN_NOTICE
			"megaraid: could not issue ldmap command:%x\n", rval));
	}


	del_timer_sync(timerp);

	mutex_unlock(&raid_dev->sysfs_mtx);

	return rval;
}


/**
 * megaraid_sysfs_show_app_hndl - display application handle for this adapter
 * @cdev	: class device object representation for the host
 * @buf		: buffer to send data to
 *
 * Display the handle used by the applications while executing management
 * tasks on the adapter. We invoke a management module API to get the adapter
 * handle, since we do not interface with applications directly.
 */
static ssize_t
megaraid_sysfs_show_app_hndl(struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(cdev);
	adapter_t	*adapter = (adapter_t *)SCSIHOST2ADAP(shost);
	uint32_t	app_hndl;

	app_hndl = mraid_mm_adapter_app_handle(adapter->unique_id);

	return snprintf(buf, 8, "%u\n", app_hndl);
}


/**
 * megaraid_sysfs_show_ldnum - display the logical drive number for this device
 * @dev		: device object representation for the scsi device
 * @attr	: device attribute to show
 * @buf		: buffer to send data to
 *
 * Display the logical drive number for the device in question, if it a valid
 * logical drive. For physical devices, "-1" is returned.
 *
 * The logical drive number is displayed in following format:
 *
 * <SCSI ID> <LD NUM> <LD STICKY ID> <APP ADAPTER HANDLE>
 *
 *   <int>     <int>       <int>            <int>
 */
static ssize_t
megaraid_sysfs_show_ldnum(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct scsi_device *sdev = to_scsi_device(dev);
	adapter_t	*adapter = (adapter_t *)SCSIHOST2ADAP(sdev->host);
	mraid_device_t	*raid_dev = ADAP2RAIDDEV(adapter);
	int		scsi_id = -1;
	int		logical_drv = -1;
	int		ldid_map = -1;
	uint32_t	app_hndl = 0;
	int		mapped_sdev_id;
	int		rval;
	int		i;

	if (raid_dev->random_del_supported &&
			MRAID_IS_LOGICAL_SDEV(adapter, sdev)) {

		rval = megaraid_sysfs_get_ldmap(adapter);
		if (rval == 0) {

			for (i = 0; i < MAX_LOGICAL_DRIVES_40LD; i++) {

				mapped_sdev_id = sdev->id;

				if (sdev->id > adapter->init_id) {
					mapped_sdev_id -= 1;
				}

				if (raid_dev->curr_ldmap[i] == mapped_sdev_id) {

					scsi_id = sdev->id;

					logical_drv = i;

					ldid_map = raid_dev->curr_ldmap[i];

					app_hndl = mraid_mm_adapter_app_handle(
							adapter->unique_id);

					break;
				}
			}
		}
		else {
			con_log(CL_ANN, (KERN_NOTICE
				"megaraid: sysfs get ld map failed: %x\n",
				rval));
		}
	}

	return snprintf(buf, 36, "%d %d %d %d\n", scsi_id, logical_drv,
			ldid_map, app_hndl);
}


/*
 * END: Mailbox Low Level Driver
 */
module_init(megaraid_init);
module_exit(megaraid_exit);

/* vim: set ts=8 sw=8 tw=78 ai si: */
OpenPOWER on IntegriCloud