aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
blob: 785fb42f66502a40e005c912d1cf9022a86ddb62 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
/*******************************************************************************
 * IBM Virtual SCSI Target Driver
 * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
 *			   Santiago Leon (santil@us.ibm.com) IBM Corp.
 *			   Linda Xie (lxie@us.ibm.com) IBM Corp.
 *
 * Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org>
 * Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org>
 *
 * Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
 * Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 ****************************************************************************/

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/string.h>
#include <linux/delay.h>

#include <target/target_core_base.h>
#include <target/target_core_fabric.h>

#include <asm/hvcall.h>
#include <asm/vio.h>

#include <scsi/viosrp.h>

#include "ibmvscsi_tgt.h"

#define IBMVSCSIS_VERSION	"v0.2"

#define	INITIAL_SRP_LIMIT	800
#define	DEFAULT_MAX_SECTORS	256
#define MAX_TXU			1024 * 1024

static uint max_vdma_size = MAX_H_COPY_RDMA;

static char system_id[SYS_ID_NAME_LEN] = "";
static char partition_name[PARTITION_NAMELEN] = "UNKNOWN";
static uint partition_number = -1;

/* Adapter list and lock to control it */
static DEFINE_SPINLOCK(ibmvscsis_dev_lock);
static LIST_HEAD(ibmvscsis_dev_list);

static long ibmvscsis_parse_command(struct scsi_info *vscsi,
				    struct viosrp_crq *crq);

static void ibmvscsis_adapter_idle(struct scsi_info *vscsi);

static void ibmvscsis_determine_resid(struct se_cmd *se_cmd,
				      struct srp_rsp *rsp)
{
	u32 residual_count = se_cmd->residual_count;

	if (!residual_count)
		return;

	if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
		if (se_cmd->data_direction == DMA_TO_DEVICE) {
			/* residual data from an underflow write */
			rsp->flags = SRP_RSP_FLAG_DOUNDER;
			rsp->data_out_res_cnt = cpu_to_be32(residual_count);
		} else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
			/* residual data from an underflow read */
			rsp->flags = SRP_RSP_FLAG_DIUNDER;
			rsp->data_in_res_cnt = cpu_to_be32(residual_count);
		}
	} else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
		if (se_cmd->data_direction == DMA_TO_DEVICE) {
			/* residual data from an overflow write */
			rsp->flags = SRP_RSP_FLAG_DOOVER;
			rsp->data_out_res_cnt = cpu_to_be32(residual_count);
		} else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
			/* residual data from an overflow read */
			rsp->flags = SRP_RSP_FLAG_DIOVER;
			rsp->data_in_res_cnt = cpu_to_be32(residual_count);
		}
	}
}

/**
 * connection_broken() - Determine if the connection to the client is good
 * @vscsi:	Pointer to our adapter structure
 *
 * This function attempts to send a ping MAD to the client. If the call to
 * queue the request returns H_CLOSED then the connection has been broken
 * and the function returns TRUE.
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt or Process environment
 */
static bool connection_broken(struct scsi_info *vscsi)
{
	struct viosrp_crq *crq;
	u64 buffer[2] = { 0, 0 };
	long h_return_code;
	bool rc = false;

	/* create a PING crq */
	crq = (struct viosrp_crq *)&buffer;
	crq->valid = VALID_CMD_RESP_EL;
	crq->format = MESSAGE_IN_CRQ;
	crq->status = PING;

	h_return_code = h_send_crq(vscsi->dds.unit_id,
				   cpu_to_be64(buffer[MSG_HI]),
				   cpu_to_be64(buffer[MSG_LOW]));

	pr_debug("connection_broken: rc %ld\n", h_return_code);

	if (h_return_code == H_CLOSED)
		rc = true;

	return rc;
}

/**
 * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue
 * @vscsi:	Pointer to our adapter structure
 *
 * This function calls h_free_q then frees the interrupt bit etc.
 * It must release the lock before doing so because of the time it can take
 * for h_free_crq in PHYP
 * NOTE: the caller must make sure that state and or flags will prevent
 *	 interrupt handler from scheduling work.
 * NOTE: anyone calling this function may need to set the CRQ_CLOSED flag
 *	 we can't do it here, because we don't have the lock
 *
 * EXECUTION ENVIRONMENT:
 *	Process level
 */
static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi)
{
	long qrc;
	long rc = ADAPT_SUCCESS;
	int ticks = 0;

	do {
		qrc = h_free_crq(vscsi->dds.unit_id);
		switch (qrc) {
		case H_SUCCESS:
			spin_lock_bh(&vscsi->intr_lock);
			vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS;
			spin_unlock_bh(&vscsi->intr_lock);
			break;

		case H_HARDWARE:
		case H_PARAMETER:
			dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n",
				qrc);
			rc = ERROR;
			break;

		case H_BUSY:
		case H_LONG_BUSY_ORDER_1_MSEC:
			/* msleep not good for small values */
			usleep_range(1000, 2000);
			ticks += 1;
			break;
		case H_LONG_BUSY_ORDER_10_MSEC:
			usleep_range(10000, 20000);
			ticks += 10;
			break;
		case H_LONG_BUSY_ORDER_100_MSEC:
			msleep(100);
			ticks += 100;
			break;
		case H_LONG_BUSY_ORDER_1_SEC:
			ssleep(1);
			ticks += 1000;
			break;
		case H_LONG_BUSY_ORDER_10_SEC:
			ssleep(10);
			ticks += 10000;
			break;
		case H_LONG_BUSY_ORDER_100_SEC:
			ssleep(100);
			ticks += 100000;
			break;
		default:
			dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n",
				qrc);
			rc = ERROR;
			break;
		}

		/*
		 * dont wait more then 300 seconds
		 * ticks are in milliseconds more or less
		 */
		if (ticks > 300000 && qrc != H_SUCCESS) {
			rc = ERROR;
			dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n");
		}
	} while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS);

	pr_debug("Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc);

	return rc;
}

/**
 * ibmvscsis_delete_client_info() - Helper function to Delete Client Info
 * @vscsi:	Pointer to our adapter structure
 * @client_closed:	True if client closed its queue
 *
 * Deletes information specific to the client when the client goes away
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt or Process
 */
static void ibmvscsis_delete_client_info(struct scsi_info *vscsi,
					 bool client_closed)
{
	vscsi->client_cap = 0;

	/*
	 * Some things we don't want to clear if we're closing the queue,
	 * because some clients don't resend the host handshake when they
	 * get a transport event.
	 */
	if (client_closed)
		vscsi->client_data.os_type = 0;
}

/**
 * ibmvscsis_free_command_q() - Free Command Queue
 * @vscsi:	Pointer to our adapter structure
 *
 * This function calls unregister_command_q, then clears interrupts and
 * any pending interrupt acknowledgments associated with the command q.
 * It also clears memory if there is no error.
 *
 * PHYP did not meet the PAPR architecture so that we must give up the
 * lock. This causes a timing hole regarding state change.  To close the
 * hole this routine does accounting on any change that occurred during
 * the time the lock is not held.
 * NOTE: must give up and then acquire the interrupt lock, the caller must
 *	 make sure that state and or flags will prevent interrupt handler from
 *	 scheduling work.
 *
 * EXECUTION ENVIRONMENT:
 *	Process level, interrupt lock is held
 */
static long ibmvscsis_free_command_q(struct scsi_info *vscsi)
{
	int bytes;
	u32 flags_under_lock;
	u16 state_under_lock;
	long rc = ADAPT_SUCCESS;

	if (!(vscsi->flags & CRQ_CLOSED)) {
		vio_disable_interrupts(vscsi->dma_dev);

		state_under_lock = vscsi->new_state;
		flags_under_lock = vscsi->flags;
		vscsi->phyp_acr_state = 0;
		vscsi->phyp_acr_flags = 0;

		spin_unlock_bh(&vscsi->intr_lock);
		rc = ibmvscsis_unregister_command_q(vscsi);
		spin_lock_bh(&vscsi->intr_lock);

		if (state_under_lock != vscsi->new_state)
			vscsi->phyp_acr_state = vscsi->new_state;

		vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags);

		if (rc == ADAPT_SUCCESS) {
			bytes = vscsi->cmd_q.size * PAGE_SIZE;
			memset(vscsi->cmd_q.base_addr, 0, bytes);
			vscsi->cmd_q.index = 0;
			vscsi->flags |= CRQ_CLOSED;

			ibmvscsis_delete_client_info(vscsi, false);
		}

		pr_debug("free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
			 vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
			 vscsi->phyp_acr_state);
	}
	return rc;
}

/**
 * ibmvscsis_cmd_q_dequeue() - Get valid Command element
 * @mask:	Mask to use in case index wraps
 * @current_index:	Current index into command queue
 * @base_addr:	Pointer to start of command queue
 *
 * Returns a pointer to a valid command element or NULL, if the command
 * queue is empty
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt environment, interrupt lock held
 */
static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask,
						  uint *current_index,
						  struct viosrp_crq *base_addr)
{
	struct viosrp_crq *ptr;

	ptr = base_addr + *current_index;

	if (ptr->valid) {
		*current_index = (*current_index + 1) & mask;
		dma_rmb();
	} else {
		ptr = NULL;
	}

	return ptr;
}

/**
 * ibmvscsis_send_init_message() - send initialize message to the client
 * @vscsi:	Pointer to our adapter structure
 * @format:	Which Init Message format to send
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt environment interrupt lock held
 */
static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format)
{
	struct viosrp_crq *crq;
	u64 buffer[2] = { 0, 0 };
	long rc;

	crq = (struct viosrp_crq *)&buffer;
	crq->valid = VALID_INIT_MSG;
	crq->format = format;
	rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
			cpu_to_be64(buffer[MSG_LOW]));

	return rc;
}

/**
 * ibmvscsis_check_init_msg() - Check init message valid
 * @vscsi:	Pointer to our adapter structure
 * @format:	Pointer to return format of Init Message, if any.
 *		Set to UNUSED_FORMAT if no Init Message in queue.
 *
 * Checks if an initialize message was queued by the initiatior
 * after the queue was created and before the interrupt was enabled.
 *
 * EXECUTION ENVIRONMENT:
 *	Process level only, interrupt lock held
 */
static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format)
{
	struct viosrp_crq *crq;
	long rc = ADAPT_SUCCESS;

	crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index,
				      vscsi->cmd_q.base_addr);
	if (!crq) {
		*format = (uint)UNUSED_FORMAT;
	} else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) {
		*format = (uint)INIT_MSG;
		crq->valid = INVALIDATE_CMD_RESP_EL;
		dma_rmb();

		/*
		 * the caller has ensured no initialize message was
		 * sent after the queue was
		 * created so there should be no other message on the queue.
		 */
		crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask,
					      &vscsi->cmd_q.index,
					      vscsi->cmd_q.base_addr);
		if (crq) {
			*format = (uint)(crq->format);
			rc = ERROR;
			crq->valid = INVALIDATE_CMD_RESP_EL;
			dma_rmb();
		}
	} else {
		*format = (uint)(crq->format);
		rc = ERROR;
		crq->valid = INVALIDATE_CMD_RESP_EL;
		dma_rmb();
	}

	return rc;
}

/**
 * ibmvscsis_disconnect() - Helper function to disconnect
 * @work:	Pointer to work_struct, gives access to our adapter structure
 *
 * An error has occurred or the driver received a Transport event,
 * and the driver is requesting that the command queue be de-registered
 * in a safe manner. If there is no outstanding I/O then we can stop the
 * queue. If we are restarting the queue it will be reflected in the
 * the state of the adapter.
 *
 * EXECUTION ENVIRONMENT:
 *	Process environment
 */
static void ibmvscsis_disconnect(struct work_struct *work)
{
	struct scsi_info *vscsi = container_of(work, struct scsi_info,
					       proc_work);
	u16 new_state;
	bool wait_idle = false;

	spin_lock_bh(&vscsi->intr_lock);
	new_state = vscsi->new_state;
	vscsi->new_state = 0;

	vscsi->flags |= DISCONNECT_SCHEDULED;
	vscsi->flags &= ~SCHEDULE_DISCONNECT;

	pr_debug("disconnect: flags 0x%x, state 0x%hx\n", vscsi->flags,
		 vscsi->state);

	/*
	 * check which state we are in and see if we
	 * should transitition to the new state
	 */
	switch (vscsi->state) {
	/* Should never be called while in this state. */
	case NO_QUEUE:
	/*
	 * Can never transition from this state;
	 * igonore errors and logout.
	 */
	case UNCONFIGURING:
		break;

	/* can transition from this state to UNCONFIGURING */
	case ERR_DISCONNECT:
		if (new_state == UNCONFIGURING)
			vscsi->state = new_state;
		break;

	/*
	 * Can transition from this state to to unconfiguring
	 * or err disconnect.
	 */
	case ERR_DISCONNECT_RECONNECT:
		switch (new_state) {
		case UNCONFIGURING:
		case ERR_DISCONNECT:
			vscsi->state = new_state;
			break;

		case WAIT_IDLE:
			break;
		default:
			break;
		}
		break;

	/* can transition from this state to UNCONFIGURING */
	case ERR_DISCONNECTED:
		if (new_state == UNCONFIGURING)
			vscsi->state = new_state;
		break;

	case WAIT_ENABLED:
		switch (new_state) {
		case UNCONFIGURING:
			vscsi->state = new_state;
			vscsi->flags |= RESPONSE_Q_DOWN;
			vscsi->flags &= ~(SCHEDULE_DISCONNECT |
					  DISCONNECT_SCHEDULED);
			dma_rmb();
			if (vscsi->flags & CFG_SLEEPING) {
				vscsi->flags &= ~CFG_SLEEPING;
				complete(&vscsi->unconfig);
			}
			break;

		/* should never happen */
		case ERR_DISCONNECT:
		case ERR_DISCONNECT_RECONNECT:
		case WAIT_IDLE:
			dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n",
				vscsi->state);
			break;
		}
		break;

	case WAIT_IDLE:
		switch (new_state) {
		case UNCONFIGURING:
			vscsi->flags |= RESPONSE_Q_DOWN;
			vscsi->state = new_state;
			vscsi->flags &= ~(SCHEDULE_DISCONNECT |
					  DISCONNECT_SCHEDULED);
			ibmvscsis_free_command_q(vscsi);
			break;
		case ERR_DISCONNECT:
		case ERR_DISCONNECT_RECONNECT:
			vscsi->state = new_state;
			break;
		}
		break;

	/*
	 * Initiator has not done a successful srp login
	 * or has done a successful srp logout ( adapter was not
	 * busy). In the first case there can be responses queued
	 * waiting for space on the initiators response queue (MAD)
	 * The second case the adapter is idle. Assume the worse case,
	 * i.e. the second case.
	 */
	case WAIT_CONNECTION:
	case CONNECTED:
	case SRP_PROCESSING:
		wait_idle = true;
		vscsi->state = new_state;
		break;

	/* can transition from this state to UNCONFIGURING */
	case UNDEFINED:
		if (new_state == UNCONFIGURING)
			vscsi->state = new_state;
		break;
	default:
		break;
	}

	if (wait_idle) {
		pr_debug("disconnect start wait, active %d, sched %d\n",
			 (int)list_empty(&vscsi->active_q),
			 (int)list_empty(&vscsi->schedule_q));
		if (!list_empty(&vscsi->active_q) ||
		    !list_empty(&vscsi->schedule_q)) {
			vscsi->flags |= WAIT_FOR_IDLE;
			pr_debug("disconnect flags 0x%x\n", vscsi->flags);
			/*
			 * This routine is can not be called with the interrupt
			 * lock held.
			 */
			spin_unlock_bh(&vscsi->intr_lock);
			wait_for_completion(&vscsi->wait_idle);
			spin_lock_bh(&vscsi->intr_lock);
		}
		pr_debug("disconnect stop wait\n");

		ibmvscsis_adapter_idle(vscsi);
	}

	spin_unlock_bh(&vscsi->intr_lock);
}

/**
 * ibmvscsis_post_disconnect() - Schedule the disconnect
 * @vscsi:	Pointer to our adapter structure
 * @new_state:	State to move to after disconnecting
 * @flag_bits:	Flags to turn on in adapter structure
 *
 * If it's already been scheduled, then see if we need to "upgrade"
 * the new state (if the one passed in is more "severe" than the
 * previous one).
 *
 * PRECONDITION:
 *	interrupt lock is held
 */
static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state,
				      uint flag_bits)
{
	uint state;

	/* check the validity of the new state */
	switch (new_state) {
	case UNCONFIGURING:
	case ERR_DISCONNECT:
	case ERR_DISCONNECT_RECONNECT:
	case WAIT_IDLE:
		break;

	default:
		dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n",
			new_state);
		return;
	}

	vscsi->flags |= flag_bits;

	pr_debug("post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n",
		 new_state, flag_bits, vscsi->flags, vscsi->state);

	if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) {
		vscsi->flags |= SCHEDULE_DISCONNECT;
		vscsi->new_state = new_state;

		INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect);
		(void)queue_work(vscsi->work_q, &vscsi->proc_work);
	} else {
		if (vscsi->new_state)
			state = vscsi->new_state;
		else
			state = vscsi->state;

		switch (state) {
		case NO_QUEUE:
		case UNCONFIGURING:
			break;

		case ERR_DISCONNECTED:
		case ERR_DISCONNECT:
		case UNDEFINED:
			if (new_state == UNCONFIGURING)
				vscsi->new_state = new_state;
			break;

		case ERR_DISCONNECT_RECONNECT:
			switch (new_state) {
			case UNCONFIGURING:
			case ERR_DISCONNECT:
				vscsi->new_state = new_state;
				break;
			default:
				break;
			}
			break;

		case WAIT_ENABLED:
		case WAIT_IDLE:
		case WAIT_CONNECTION:
		case CONNECTED:
		case SRP_PROCESSING:
			vscsi->new_state = new_state;
			break;

		default:
			break;
		}
	}

	pr_debug("Leaving post_disconnect: flags 0x%x, new_state 0x%x\n",
		 vscsi->flags, vscsi->new_state);
}

/**
 * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message
 * @vscsi:	Pointer to our adapter structure
 *
 * Must be called with interrupt lock held.
 */
static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi)
{
	long rc = ADAPT_SUCCESS;

	switch (vscsi->state) {
	case NO_QUEUE:
	case ERR_DISCONNECT:
	case ERR_DISCONNECT_RECONNECT:
	case ERR_DISCONNECTED:
	case UNCONFIGURING:
	case UNDEFINED:
		rc = ERROR;
		break;

	case WAIT_CONNECTION:
		vscsi->state = CONNECTED;
		break;

	case WAIT_IDLE:
	case SRP_PROCESSING:
	case CONNECTED:
	case WAIT_ENABLED:
	default:
		rc = ERROR;
		dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n",
			vscsi->state);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		break;
	}

	return rc;
}

/**
 * ibmvscsis_handle_init_msg() - Respond to an Init Message
 * @vscsi:	Pointer to our adapter structure
 *
 * Must be called with interrupt lock held.
 */
static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi)
{
	long rc = ADAPT_SUCCESS;

	switch (vscsi->state) {
	case WAIT_CONNECTION:
		rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG);
		switch (rc) {
		case H_SUCCESS:
			vscsi->state = CONNECTED;
			break;

		case H_PARAMETER:
			dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
				rc);
			ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
			break;

		case H_DROPPED:
			dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
				rc);
			rc = ERROR;
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT, 0);
			break;

		case H_CLOSED:
			pr_warn("init_msg: failed to send, rc %ld\n", rc);
			rc = 0;
			break;
		}
		break;

	case UNDEFINED:
		rc = ERROR;
		break;

	case UNCONFIGURING:
		break;

	case WAIT_ENABLED:
	case CONNECTED:
	case SRP_PROCESSING:
	case WAIT_IDLE:
	case NO_QUEUE:
	case ERR_DISCONNECT:
	case ERR_DISCONNECT_RECONNECT:
	case ERR_DISCONNECTED:
	default:
		rc = ERROR;
		dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n",
			vscsi->state);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		break;
	}

	return rc;
}

/**
 * ibmvscsis_init_msg() - Respond to an init message
 * @vscsi:	Pointer to our adapter structure
 * @crq:	Pointer to CRQ element containing the Init Message
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, interrupt lock held
 */
static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq)
{
	long rc = ADAPT_SUCCESS;

	pr_debug("init_msg: state 0x%hx\n", vscsi->state);

	rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
		      (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
		      0);
	if (rc == H_SUCCESS) {
		vscsi->client_data.partition_number =
			be64_to_cpu(*(u64 *)vscsi->map_buf);
		pr_debug("init_msg, part num %d\n",
			 vscsi->client_data.partition_number);
	} else {
		pr_debug("init_msg h_vioctl rc %ld\n", rc);
		rc = ADAPT_SUCCESS;
	}

	if (crq->format == INIT_MSG) {
		rc = ibmvscsis_handle_init_msg(vscsi);
	} else if (crq->format == INIT_COMPLETE_MSG) {
		rc = ibmvscsis_handle_init_compl_msg(vscsi);
	} else {
		rc = ERROR;
		dev_err(&vscsi->dev, "init_msg: invalid format %d\n",
			(uint)crq->format);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
	}

	return rc;
}

/**
 * ibmvscsis_establish_new_q() - Establish new CRQ queue
 * @vscsi:	Pointer to our adapter structure
 *
 * Must be called with interrupt lock held.
 */
static long ibmvscsis_establish_new_q(struct scsi_info *vscsi)
{
	long rc = ADAPT_SUCCESS;
	uint format;

	rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000,
		      0, 0, 0, 0);
	if (rc == H_SUCCESS)
		vscsi->flags |= PREP_FOR_SUSPEND_ENABLED;
	else if (rc != H_NOT_FOUND)
		pr_err("Error from Enable Prepare for Suspend: %ld\n", rc);

	vscsi->flags &= PRESERVE_FLAG_FIELDS;
	vscsi->rsp_q_timer.timer_pops = 0;
	vscsi->debit = 0;
	vscsi->credit = 0;

	rc = vio_enable_interrupts(vscsi->dma_dev);
	if (rc) {
		pr_warn("establish_new_q: failed to enable interrupts, rc %ld\n",
			rc);
		return rc;
	}

	rc = ibmvscsis_check_init_msg(vscsi, &format);
	if (rc) {
		dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n",
			rc);
		return rc;
	}

	if (format == UNUSED_FORMAT) {
		rc = ibmvscsis_send_init_message(vscsi, INIT_MSG);
		switch (rc) {
		case H_SUCCESS:
		case H_DROPPED:
		case H_CLOSED:
			rc = ADAPT_SUCCESS;
			break;

		case H_PARAMETER:
		case H_HARDWARE:
			break;

		default:
			vscsi->state = UNDEFINED;
			rc = H_HARDWARE;
			break;
		}
	} else if (format == INIT_MSG) {
		rc = ibmvscsis_handle_init_msg(vscsi);
	}

	return rc;
}

/**
 * ibmvscsis_reset_queue() - Reset CRQ Queue
 * @vscsi:	Pointer to our adapter structure
 *
 * This function calls h_free_q and then calls h_reg_q and does all
 * of the bookkeeping to get us back to where we can communicate.
 *
 * Actually, we don't always call h_free_crq.  A problem was discovered
 * where one partition would close and reopen his queue, which would
 * cause his partner to get a transport event, which would cause him to
 * close and reopen his queue, which would cause the original partition
 * to get a transport event, etc., etc.  To prevent this, we don't
 * actually close our queue if the client initiated the reset, (i.e.
 * either we got a transport event or we have detected that the client's
 * queue is gone)
 *
 * EXECUTION ENVIRONMENT:
 *	Process environment, called with interrupt lock held
 */
static void ibmvscsis_reset_queue(struct scsi_info *vscsi)
{
	int bytes;
	long rc = ADAPT_SUCCESS;

	pr_debug("reset_queue: flags 0x%x\n", vscsi->flags);

	/* don't reset, the client did it for us */
	if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) {
		vscsi->flags &= PRESERVE_FLAG_FIELDS;
		vscsi->rsp_q_timer.timer_pops = 0;
		vscsi->debit = 0;
		vscsi->credit = 0;
		vscsi->state = WAIT_CONNECTION;
		vio_enable_interrupts(vscsi->dma_dev);
	} else {
		rc = ibmvscsis_free_command_q(vscsi);
		if (rc == ADAPT_SUCCESS) {
			vscsi->state = WAIT_CONNECTION;

			bytes = vscsi->cmd_q.size * PAGE_SIZE;
			rc = h_reg_crq(vscsi->dds.unit_id,
				       vscsi->cmd_q.crq_token, bytes);
			if (rc == H_CLOSED || rc == H_SUCCESS) {
				rc = ibmvscsis_establish_new_q(vscsi);
			}

			if (rc != ADAPT_SUCCESS) {
				pr_debug("reset_queue: reg_crq rc %ld\n", rc);

				vscsi->state = ERR_DISCONNECTED;
				vscsi->flags |= RESPONSE_Q_DOWN;
				ibmvscsis_free_command_q(vscsi);
			}
		} else {
			vscsi->state = ERR_DISCONNECTED;
			vscsi->flags |= RESPONSE_Q_DOWN;
		}
	}
}

/**
 * ibmvscsis_free_cmd_resources() - Free command resources
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Command which is not longer in use
 *
 * Must be called with interrupt lock held.
 */
static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi,
					 struct ibmvscsis_cmd *cmd)
{
	struct iu_entry *iue = cmd->iue;

	switch (cmd->type) {
	case TASK_MANAGEMENT:
	case SCSI_CDB:
		/*
		 * When the queue goes down this value is cleared, so it
		 * cannot be cleared in this general purpose function.
		 */
		if (vscsi->debit)
			vscsi->debit -= 1;
		break;
	case ADAPTER_MAD:
		vscsi->flags &= ~PROCESSING_MAD;
		break;
	case UNSET_TYPE:
		break;
	default:
		dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n",
			cmd->type);
		break;
	}

	cmd->iue = NULL;
	list_add_tail(&cmd->list, &vscsi->free_cmd);
	srp_iu_put(iue);

	if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) &&
	    list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) {
		vscsi->flags &= ~WAIT_FOR_IDLE;
		complete(&vscsi->wait_idle);
	}
}

/**
 * ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL
 * @vscsi:	Pointer to our adapter structure
 * @idle:	Indicates whether we were called from adapter_idle.  This
 *		is important to know if we need to do a disconnect, since if
 *		we're called from adapter_idle, we're still processing the
 *		current disconnect, so we can't just call post_disconnect.
 *
 * This function is called when the adapter is idle when phyp has sent
 * us a Prepare for Suspend Transport Event.
 *
 * EXECUTION ENVIRONMENT:
 *	Process or interrupt environment called with interrupt lock held
 */
static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle)
{
	long rc = 0;
	struct viosrp_crq *crq;

	/* See if there is a Resume event in the queue */
	crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;

	pr_debug("ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n",
		 vscsi->flags, vscsi->state, (int)crq->valid);

	if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) {
		rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0,
			      0, 0);
		if (rc) {
			pr_err("Ready for Suspend Vioctl failed: %ld\n", rc);
			rc = 0;
		}
	} else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) &&
		    (vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) ||
		   ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
				     (crq->format != RESUME_FROM_SUSP)))) {
		if (idle) {
			vscsi->state = ERR_DISCONNECT_RECONNECT;
			ibmvscsis_reset_queue(vscsi);
			rc = -1;
		} else if (vscsi->state == CONNECTED) {
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT, 0);
		}

		vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;

		if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
				     (crq->format != RESUME_FROM_SUSP)))
			pr_err("Invalid element in CRQ after Prepare for Suspend");
	}

	vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED);

	return rc;
}

/**
 * ibmvscsis_trans_event() - Handle a Transport Event
 * @vscsi:	Pointer to our adapter structure
 * @crq:	Pointer to CRQ entry containing the Transport Event
 *
 * Do the logic to close the I_T nexus.  This function may not
 * behave to specification.
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, interrupt lock held
 */
static long ibmvscsis_trans_event(struct scsi_info *vscsi,
				  struct viosrp_crq *crq)
{
	long rc = ADAPT_SUCCESS;

	pr_debug("trans_event: format %d, flags 0x%x, state 0x%hx\n",
		 (int)crq->format, vscsi->flags, vscsi->state);

	switch (crq->format) {
	case MIGRATED:
	case PARTNER_FAILED:
	case PARTNER_DEREGISTER:
		ibmvscsis_delete_client_info(vscsi, true);
		if (crq->format == MIGRATED)
			vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
		switch (vscsi->state) {
		case NO_QUEUE:
		case ERR_DISCONNECTED:
		case UNDEFINED:
			break;

		case UNCONFIGURING:
			vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
			break;

		case WAIT_ENABLED:
			break;

		case WAIT_CONNECTION:
			break;

		case CONNECTED:
			ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
						  (RESPONSE_Q_DOWN |
						   TRANS_EVENT));
			break;

		case SRP_PROCESSING:
			if ((vscsi->debit > 0) ||
			    !list_empty(&vscsi->schedule_q) ||
			    !list_empty(&vscsi->waiting_rsp) ||
			    !list_empty(&vscsi->active_q)) {
				pr_debug("debit %d, sched %d, wait %d, active %d\n",
					 vscsi->debit,
					 (int)list_empty(&vscsi->schedule_q),
					 (int)list_empty(&vscsi->waiting_rsp),
					 (int)list_empty(&vscsi->active_q));
				pr_warn("connection lost with outstanding work\n");
			} else {
				pr_debug("trans_event: SRP Processing, but no outstanding work\n");
			}

			ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
						  (RESPONSE_Q_DOWN |
						   TRANS_EVENT));
			break;

		case ERR_DISCONNECT:
		case ERR_DISCONNECT_RECONNECT:
		case WAIT_IDLE:
			vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
			break;
		}
		break;

	case PREPARE_FOR_SUSPEND:
		pr_debug("Prep for Suspend, crq status = 0x%x\n",
			 (int)crq->status);
		switch (vscsi->state) {
		case ERR_DISCONNECTED:
		case WAIT_CONNECTION:
		case CONNECTED:
			ibmvscsis_ready_for_suspend(vscsi, false);
			break;
		case SRP_PROCESSING:
			vscsi->resume_state = vscsi->state;
			vscsi->flags |= PREP_FOR_SUSPEND_PENDING;
			if (crq->status == CRQ_ENTRY_OVERWRITTEN)
				vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE;
			ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
			break;
		case NO_QUEUE:
		case UNDEFINED:
		case UNCONFIGURING:
		case WAIT_ENABLED:
		case ERR_DISCONNECT:
		case ERR_DISCONNECT_RECONNECT:
		case WAIT_IDLE:
			pr_err("Invalid state for Prepare for Suspend Trans Event: 0x%x\n",
			       vscsi->state);
			break;
		}
		break;

	case RESUME_FROM_SUSP:
		pr_debug("Resume from Suspend, crq status = 0x%x\n",
			 (int)crq->status);
		if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
			vscsi->flags |= PREP_FOR_SUSPEND_ABORTED;
		} else {
			if ((crq->status == CRQ_ENTRY_OVERWRITTEN) ||
			    (vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) {
				ibmvscsis_post_disconnect(vscsi,
							  ERR_DISCONNECT_RECONNECT,
							  0);
				vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
			}
		}
		break;

	default:
		rc = ERROR;
		dev_err(&vscsi->dev, "trans_event: invalid format %d\n",
			(uint)crq->format);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT,
					  RESPONSE_Q_DOWN);
		break;
	}

	rc = vscsi->flags & SCHEDULE_DISCONNECT;

	pr_debug("Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n",
		 vscsi->flags, vscsi->state, rc);

	return rc;
}

/**
 * ibmvscsis_poll_cmd_q() - Poll Command Queue
 * @vscsi:	Pointer to our adapter structure
 *
 * Called to handle command elements that may have arrived while
 * interrupts were disabled.
 *
 * EXECUTION ENVIRONMENT:
 *	intr_lock must be held
 */
static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi)
{
	struct viosrp_crq *crq;
	long rc;
	bool ack = true;
	volatile u8 valid;

	pr_debug("poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n",
		 vscsi->flags, vscsi->state, vscsi->cmd_q.index);

	rc = vscsi->flags & SCHEDULE_DISCONNECT;
	crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
	valid = crq->valid;
	dma_rmb();

	while (valid) {
poll_work:
		vscsi->cmd_q.index =
			(vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;

		if (!rc) {
			rc = ibmvscsis_parse_command(vscsi, crq);
		} else {
			if ((uint)crq->valid == VALID_TRANS_EVENT) {
				/*
				 * must service the transport layer events even
				 * in an error state, dont break out until all
				 * the consecutive transport events have been
				 * processed
				 */
				rc = ibmvscsis_trans_event(vscsi, crq);
			} else if (vscsi->flags & TRANS_EVENT) {
				/*
				 * if a tranport event has occurred leave
				 * everything but transport events on the queue
				 */
				pr_debug("poll_cmd_q, ignoring\n");

				/*
				 * need to decrement the queue index so we can
				 * look at the elment again
				 */
				if (vscsi->cmd_q.index)
					vscsi->cmd_q.index -= 1;
				else
					/*
					 * index is at 0 it just wrapped.
					 * have it index last element in q
					 */
					vscsi->cmd_q.index = vscsi->cmd_q.mask;
				break;
			}
		}

		crq->valid = INVALIDATE_CMD_RESP_EL;

		crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
		valid = crq->valid;
		dma_rmb();
	}

	if (!rc) {
		if (ack) {
			vio_enable_interrupts(vscsi->dma_dev);
			ack = false;
			pr_debug("poll_cmd_q, reenabling interrupts\n");
		}
		valid = crq->valid;
		dma_rmb();
		if (valid)
			goto poll_work;
	}

	pr_debug("Leaving poll_cmd_q: rc %ld\n", rc);
}

/**
 * ibmvscsis_free_cmd_qs() - Free elements in queue
 * @vscsi:	Pointer to our adapter structure
 *
 * Free all of the elements on all queues that are waiting for
 * whatever reason.
 *
 * PRECONDITION:
 *	Called with interrupt lock held
 */
static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi)
{
	struct ibmvscsis_cmd *cmd, *nxt;

	pr_debug("free_cmd_qs: waiting_rsp empty %d, timer starter %d\n",
		 (int)list_empty(&vscsi->waiting_rsp),
		 vscsi->rsp_q_timer.started);

	list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) {
		list_del(&cmd->list);
		ibmvscsis_free_cmd_resources(vscsi, cmd);
	}
}

/**
 * ibmvscsis_get_free_cmd() - Get free command from list
 * @vscsi:	Pointer to our adapter structure
 *
 * Must be called with interrupt lock held.
 */
static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi)
{
	struct ibmvscsis_cmd *cmd = NULL;
	struct iu_entry *iue;

	iue = srp_iu_get(&vscsi->target);
	if (iue) {
		cmd = list_first_entry_or_null(&vscsi->free_cmd,
					       struct ibmvscsis_cmd, list);
		if (cmd) {
			if (cmd->abort_cmd)
				cmd->abort_cmd = NULL;
			cmd->flags &= ~(DELAY_SEND);
			list_del(&cmd->list);
			cmd->iue = iue;
			cmd->type = UNSET_TYPE;
			memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd));
		} else {
			srp_iu_put(iue);
		}
	}

	return cmd;
}

/**
 * ibmvscsis_adapter_idle() - Helper function to handle idle adapter
 * @vscsi:	Pointer to our adapter structure
 *
 * This function is called when the adapter is idle when the driver
 * is attempting to clear an error condition.
 * The adapter is considered busy if any of its cmd queues
 * are non-empty. This function can be invoked
 * from the off level disconnect function.
 *
 * EXECUTION ENVIRONMENT:
 *	Process environment called with interrupt lock held
 */
static void ibmvscsis_adapter_idle(struct scsi_info *vscsi)
{
	int free_qs = false;
	long rc = 0;

	pr_debug("adapter_idle: flags 0x%x, state 0x%hx\n", vscsi->flags,
		 vscsi->state);

	/* Only need to free qs if we're disconnecting from client */
	if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT)
		free_qs = true;

	switch (vscsi->state) {
	case UNCONFIGURING:
		ibmvscsis_free_command_q(vscsi);
		dma_rmb();
		isync();
		if (vscsi->flags & CFG_SLEEPING) {
			vscsi->flags &= ~CFG_SLEEPING;
			complete(&vscsi->unconfig);
		}
		break;
	case ERR_DISCONNECT_RECONNECT:
		ibmvscsis_reset_queue(vscsi);
		pr_debug("adapter_idle, disc_rec: flags 0x%x\n", vscsi->flags);
		break;

	case ERR_DISCONNECT:
		ibmvscsis_free_command_q(vscsi);
		vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED);
		vscsi->flags |= RESPONSE_Q_DOWN;
		if (vscsi->tport.enabled)
			vscsi->state = ERR_DISCONNECTED;
		else
			vscsi->state = WAIT_ENABLED;
		pr_debug("adapter_idle, disc: flags 0x%x, state 0x%hx\n",
			 vscsi->flags, vscsi->state);
		break;

	case WAIT_IDLE:
		vscsi->rsp_q_timer.timer_pops = 0;
		vscsi->debit = 0;
		vscsi->credit = 0;
		if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
			vscsi->state = vscsi->resume_state;
			vscsi->resume_state = 0;
			rc = ibmvscsis_ready_for_suspend(vscsi, true);
			vscsi->flags &= ~DISCONNECT_SCHEDULED;
			if (rc)
				break;
		} else if (vscsi->flags & TRANS_EVENT) {
			vscsi->state = WAIT_CONNECTION;
			vscsi->flags &= PRESERVE_FLAG_FIELDS;
		} else {
			vscsi->state = CONNECTED;
			vscsi->flags &= ~DISCONNECT_SCHEDULED;
		}

		pr_debug("adapter_idle, wait: flags 0x%x, state 0x%hx\n",
			 vscsi->flags, vscsi->state);
		ibmvscsis_poll_cmd_q(vscsi);
		break;

	case ERR_DISCONNECTED:
		vscsi->flags &= ~DISCONNECT_SCHEDULED;
		pr_debug("adapter_idle, disconnected: flags 0x%x, state 0x%hx\n",
			 vscsi->flags, vscsi->state);
		break;

	default:
		dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n",
			vscsi->state);
		break;
	}

	if (free_qs)
		ibmvscsis_free_cmd_qs(vscsi);

	/*
	 * There is a timing window where we could lose a disconnect request.
	 * The known path to this window occurs during the DISCONNECT_RECONNECT
	 * case above: reset_queue calls free_command_q, which will release the
	 * interrupt lock.  During that time, a new post_disconnect call can be
	 * made with a "more severe" state (DISCONNECT or UNCONFIGURING).
	 * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect
	 * will only set the new_state.  Now free_command_q reacquires the intr
	 * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_
	 * FIELDS), and the disconnect is lost.  This is particularly bad when
	 * the new disconnect was for UNCONFIGURING, since the unconfigure hangs
	 * forever.
	 * Fix is that free command queue sets acr state and acr flags if there
	 * is a change under the lock
	 * note free command queue writes to this state it clears it
	 * before releasing the lock, different drivers call the free command
	 * queue different times so dont initialize above
	 */
	if (vscsi->phyp_acr_state != 0)	{
		/*
		 * set any bits in flags that may have been cleared by
		 * a call to free command queue in switch statement
		 * or reset queue
		 */
		vscsi->flags |= vscsi->phyp_acr_flags;
		ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0);
		vscsi->phyp_acr_state = 0;
		vscsi->phyp_acr_flags = 0;

		pr_debug("adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
			 vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
			 vscsi->phyp_acr_state);
	}

	pr_debug("Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n",
		 vscsi->flags, vscsi->state, vscsi->new_state);
}

/**
 * ibmvscsis_copy_crq_packet() - Copy CRQ Packet
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Pointer to command element to use to process the request
 * @crq:	Pointer to CRQ entry containing the request
 *
 * Copy the srp information unit from the hosted
 * partition using remote dma
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, interrupt lock held
 */
static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi,
				      struct ibmvscsis_cmd *cmd,
				      struct viosrp_crq *crq)
{
	struct iu_entry *iue = cmd->iue;
	long rc = 0;
	u16 len;

	len = be16_to_cpu(crq->IU_length);
	if ((len > SRP_MAX_IU_LEN) || (len == 0)) {
		dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		return SRP_VIOLATION;
	}

	rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(crq->IU_data_ptr),
			 vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma);

	switch (rc) {
	case H_SUCCESS:
		cmd->init_time = mftb();
		iue->remote_token = crq->IU_data_ptr;
		iue->iu_len = len;
		pr_debug("copy_crq: ioba 0x%llx, init_time 0x%llx\n",
			 be64_to_cpu(crq->IU_data_ptr), cmd->init_time);
		break;
	case H_PERMISSION:
		if (connection_broken(vscsi))
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT,
						  (RESPONSE_Q_DOWN |
						   CLIENT_FAILED));
		else
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT, 0);

		dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
			rc);
		break;
	case H_DEST_PARM:
	case H_SOURCE_PARM:
	default:
		dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		break;
	}

	return rc;
}

/**
 * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram
 * @vscsi:	Pointer to our adapter structure
 * @iue:	Information Unit containing the Adapter Info MAD request
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt adapter lock is held
 */
static long ibmvscsis_adapter_info(struct scsi_info *vscsi,
				   struct iu_entry *iue)
{
	struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info;
	struct mad_adapter_info_data *info;
	uint flag_bits = 0;
	dma_addr_t token;
	long rc;

	mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS);

	if (be16_to_cpu(mad->common.length) > sizeof(*info)) {
		mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
		return 0;
	}

	info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token,
				  GFP_ATOMIC);
	if (!info) {
		dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
			iue->target);
		mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
		return 0;
	}

	/* Get remote info */
	rc = h_copy_rdma(be16_to_cpu(mad->common.length),
			 vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(mad->buffer),
			 vscsi->dds.window[LOCAL].liobn, token);

	if (rc != H_SUCCESS) {
		if (rc == H_PERMISSION) {
			if (connection_broken(vscsi))
				flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
		}
		pr_warn("adapter_info: h_copy_rdma from client failed, rc %ld\n",
			rc);
		pr_debug("adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n",
			 be64_to_cpu(mad->buffer), vscsi->flags, flag_bits);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
					  flag_bits);
		goto free_dma;
	}

	/*
	 * Copy client info, but ignore partition number, which we
	 * already got from phyp - unless we failed to get it from
	 * phyp (e.g. if we're running on a p5 system).
	 */
	if (vscsi->client_data.partition_number == 0)
		vscsi->client_data.partition_number =
			be32_to_cpu(info->partition_number);
	strncpy(vscsi->client_data.srp_version, info->srp_version,
		sizeof(vscsi->client_data.srp_version));
	strncpy(vscsi->client_data.partition_name, info->partition_name,
		sizeof(vscsi->client_data.partition_name));
	vscsi->client_data.mad_version = be32_to_cpu(info->mad_version);
	vscsi->client_data.os_type = be32_to_cpu(info->os_type);

	/* Copy our info */
	strncpy(info->srp_version, SRP_VERSION,
		sizeof(info->srp_version));
	strncpy(info->partition_name, vscsi->dds.partition_name,
		sizeof(info->partition_name));
	info->partition_number = cpu_to_be32(vscsi->dds.partition_num);
	info->mad_version = cpu_to_be32(MAD_VERSION_1);
	info->os_type = cpu_to_be32(LINUX);
	memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu));
	info->port_max_txu[0] = cpu_to_be32(MAX_TXU);

	dma_wmb();
	rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn,
			 token, vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(mad->buffer));
	switch (rc) {
	case H_SUCCESS:
		break;

	case H_SOURCE_PARM:
	case H_DEST_PARM:
	case H_PERMISSION:
		if (connection_broken(vscsi))
			flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
	default:
		dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi,
					  ERR_DISCONNECT_RECONNECT,
					  flag_bits);
		break;
	}

free_dma:
	dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token);
	pr_debug("Leaving adapter_info, rc %ld\n", rc);

	return rc;
}

/**
 * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram
 * @vscsi:	Pointer to our adapter structure
 * @iue:	Information Unit containing the Capabilities MAD request
 *
 * NOTE: if you return an error from this routine you must be
 * disconnecting or you will cause a hang
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt called with adapter lock held
 */
static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue)
{
	struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities;
	struct capabilities *cap;
	struct mad_capability_common *common;
	dma_addr_t token;
	u16 olen, len, status, min_len, cap_len;
	u32 flag;
	uint flag_bits = 0;
	long rc = 0;

	olen = be16_to_cpu(mad->common.length);
	/*
	 * struct capabilities hardcodes a couple capabilities after the
	 * header, but the capabilities can actually be in any order.
	 */
	min_len = offsetof(struct capabilities, migration);
	if ((olen < min_len) || (olen > PAGE_SIZE)) {
		pr_warn("cap_mad: invalid len %d\n", olen);
		mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
		return 0;
	}

	cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token,
				 GFP_ATOMIC);
	if (!cap) {
		dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
			iue->target);
		mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
		return 0;
	}
	rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(mad->buffer),
			 vscsi->dds.window[LOCAL].liobn, token);
	if (rc == H_SUCCESS) {
		strncpy(cap->name, dev_name(&vscsi->dma_dev->dev),
			SRP_MAX_LOC_LEN);

		len = olen - min_len;
		status = VIOSRP_MAD_SUCCESS;
		common = (struct mad_capability_common *)&cap->migration;

		while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) {
			pr_debug("cap_mad: len left %hd, cap type %d, cap len %hd\n",
				 len, be32_to_cpu(common->cap_type),
				 be16_to_cpu(common->length));

			cap_len = be16_to_cpu(common->length);
			if (cap_len > len) {
				dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n");
				status = VIOSRP_MAD_FAILED;
				break;
			}

			if (cap_len == 0) {
				dev_err(&vscsi->dev, "cap_mad: cap len is 0\n");
				status = VIOSRP_MAD_FAILED;
				break;
			}

			switch (common->cap_type) {
			default:
				pr_debug("cap_mad: unsupported capability\n");
				common->server_support = 0;
				flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED);
				cap->flags &= ~flag;
				break;
			}

			len = len - cap_len;
			common = (struct mad_capability_common *)
				((char *)common + cap_len);
		}

		mad->common.status = cpu_to_be16(status);

		dma_wmb();
		rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token,
				 vscsi->dds.window[REMOTE].liobn,
				 be64_to_cpu(mad->buffer));

		if (rc != H_SUCCESS) {
			pr_debug("cap_mad: failed to copy to client, rc %ld\n",
				 rc);

			if (rc == H_PERMISSION) {
				if (connection_broken(vscsi))
					flag_bits = (RESPONSE_Q_DOWN |
						     CLIENT_FAILED);
			}

			pr_warn("cap_mad: error copying data to client, rc %ld\n",
				rc);
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT,
						  flag_bits);
		}
	}

	dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token);

	pr_debug("Leaving cap_mad, rc %ld, client_cap 0x%x\n",
		 rc, vscsi->client_cap);

	return rc;
}

/**
 * ibmvscsis_process_mad() - Service a MAnagement Data gram
 * @vscsi:	Pointer to our adapter structure
 * @iue:	Information Unit containing the MAD request
 *
 * Must be called with interrupt lock held.
 */
static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue)
{
	struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
	struct viosrp_empty_iu *empty;
	long rc = ADAPT_SUCCESS;

	switch (be32_to_cpu(mad->type)) {
	case VIOSRP_EMPTY_IU_TYPE:
		empty = &vio_iu(iue)->mad.empty_iu;
		vscsi->empty_iu_id = be64_to_cpu(empty->buffer);
		vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag);
		mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
		break;
	case VIOSRP_ADAPTER_INFO_TYPE:
		rc = ibmvscsis_adapter_info(vscsi, iue);
		break;
	case VIOSRP_CAPABILITIES_TYPE:
		rc = ibmvscsis_cap_mad(vscsi, iue);
		break;
	case VIOSRP_ENABLE_FAST_FAIL:
		if (vscsi->state == CONNECTED) {
			vscsi->fast_fail = true;
			mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
		} else {
			pr_warn("fast fail mad sent after login\n");
			mad->status = cpu_to_be16(VIOSRP_MAD_FAILED);
		}
		break;
	default:
		mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED);
		break;
	}

	return rc;
}

/**
 * srp_snd_msg_failed() - Handle an error when sending a response
 * @vscsi:	Pointer to our adapter structure
 * @rc:		The return code from the h_send_crq command
 *
 * Must be called with interrupt lock held.
 */
static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc)
{
	ktime_t kt;

	if (rc != H_DROPPED) {
		ibmvscsis_free_cmd_qs(vscsi);

		if (rc == H_CLOSED)
			vscsi->flags |= CLIENT_FAILED;

		/* don't flag the same problem multiple times */
		if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
			vscsi->flags |= RESPONSE_Q_DOWN;
			if (!(vscsi->state & (ERR_DISCONNECT |
					      ERR_DISCONNECT_RECONNECT |
					      ERR_DISCONNECTED | UNDEFINED))) {
				dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n",
					vscsi->state, vscsi->flags, rc);
			}
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT, 0);
		}
		return;
	}

	/*
	 * The response queue is full.
	 * If the server is processing SRP requests, i.e.
	 * the client has successfully done an
	 * SRP_LOGIN, then it will wait forever for room in
	 * the queue.  However if the system admin
	 * is attempting to unconfigure the server then one
	 * or more children will be in a state where
	 * they are being removed. So if there is even one
	 * child being removed then the driver assumes
	 * the system admin is attempting to break the
	 * connection with the client and MAX_TIMER_POPS
	 * is honored.
	 */
	if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) ||
	    (vscsi->state == SRP_PROCESSING)) {
		pr_debug("snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n",
			 vscsi->flags, (int)vscsi->rsp_q_timer.started,
			 vscsi->rsp_q_timer.timer_pops);

		/*
		 * Check if the timer is running; if it
		 * is not then start it up.
		 */
		if (!vscsi->rsp_q_timer.started) {
			if (vscsi->rsp_q_timer.timer_pops <
			    MAX_TIMER_POPS) {
				kt = WAIT_NANO_SECONDS;
			} else {
				/*
				 * slide the timeslice if the maximum
				 * timer pops have already happened
				 */
				kt = ktime_set(WAIT_SECONDS, 0);
			}

			vscsi->rsp_q_timer.started = true;
			hrtimer_start(&vscsi->rsp_q_timer.timer, kt,
				      HRTIMER_MODE_REL);
		}
	} else {
		/*
		 * TBD: Do we need to worry about this? Need to get
		 *      remove working.
		 */
		/*
		 * waited a long time and it appears the system admin
		 * is bring this driver down
		 */
		vscsi->flags |= RESPONSE_Q_DOWN;
		ibmvscsis_free_cmd_qs(vscsi);
		/*
		 * if the driver is already attempting to disconnect
		 * from the client and has already logged an error
		 * trace this event but don't put it in the error log
		 */
		if (!(vscsi->state & (ERR_DISCONNECT |
				      ERR_DISCONNECT_RECONNECT |
				      ERR_DISCONNECTED | UNDEFINED))) {
			dev_err(&vscsi->dev, "client crq full too long\n");
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT,
						  0);
		}
	}
}

/**
 * ibmvscsis_send_messages() - Send a Response
 * @vscsi:	Pointer to our adapter structure
 *
 * Send a response, first checking the waiting queue. Responses are
 * sent in order they are received. If the response cannot be sent,
 * because the client queue is full, it stays on the waiting queue.
 *
 * PRECONDITION:
 *	Called with interrupt lock held
 */
static void ibmvscsis_send_messages(struct scsi_info *vscsi)
{
	u64 msg_hi = 0;
	/* note do not attempt to access the IU_data_ptr with this pointer
	 * it is not valid
	 */
	struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi;
	struct ibmvscsis_cmd *cmd, *nxt;
	struct iu_entry *iue;
	long rc = ADAPT_SUCCESS;
	bool retry = false;

	if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
		do {
			retry = false;
			list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp,
						 list) {
				/*
				 * Check to make sure abort cmd gets processed
				 * prior to the abort tmr cmd
				 */
				if (cmd->flags & DELAY_SEND)
					continue;

				if (cmd->abort_cmd) {
					retry = true;
					cmd->abort_cmd->flags &= ~(DELAY_SEND);
					cmd->abort_cmd = NULL;
				}

				/*
				 * If CMD_T_ABORTED w/o CMD_T_TAS scenarios and
				 * the case where LIO issued a
				 * ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST
				 * case then we dont send a response, since it
				 * was already done.
				 */
				if (cmd->se_cmd.transport_state & CMD_T_ABORTED &&
				    !(cmd->se_cmd.transport_state & CMD_T_TAS)) {
					list_del(&cmd->list);
					ibmvscsis_free_cmd_resources(vscsi,
								     cmd);
					/*
					 * With a successfully aborted op
					 * through LIO we want to increment the
					 * the vscsi credit so that when we dont
					 * send a rsp to the original scsi abort
					 * op (h_send_crq), but the tm rsp to
					 * the abort is sent, the credit is
					 * correctly sent with the abort tm rsp.
					 * We would need 1 for the abort tm rsp
					 * and 1 credit for the aborted scsi op.
					 * Thus we need to increment here.
					 * Also we want to increment the credit
					 * here because we want to make sure
					 * cmd is actually released first
					 * otherwise the client will think it
					 * it can send a new cmd, and we could
					 * find ourselves short of cmd elements.
					 */
					vscsi->credit += 1;
				} else {
					iue = cmd->iue;

					crq->valid = VALID_CMD_RESP_EL;
					crq->format = cmd->rsp.format;

					if (cmd->flags & CMD_FAST_FAIL)
						crq->status = VIOSRP_ADAPTER_FAIL;

					crq->IU_length = cpu_to_be16(cmd->rsp.len);

					rc = h_send_crq(vscsi->dma_dev->unit_address,
							be64_to_cpu(msg_hi),
							be64_to_cpu(cmd->rsp.tag));

					pr_debug("send_messages: cmd %p, tag 0x%llx, rc %ld\n",
						 cmd, be64_to_cpu(cmd->rsp.tag), rc);

					/* if all ok free up the command
					 * element resources
					 */
					if (rc == H_SUCCESS) {
						/* some movement has occurred */
						vscsi->rsp_q_timer.timer_pops = 0;
						list_del(&cmd->list);

						ibmvscsis_free_cmd_resources(vscsi,
									     cmd);
					} else {
						srp_snd_msg_failed(vscsi, rc);
						break;
					}
				}
			}
		} while (retry);

		if (!rc) {
			/*
			 * The timer could pop with the queue empty.  If
			 * this happens, rc will always indicate a
			 * success; clear the pop count.
			 */
			vscsi->rsp_q_timer.timer_pops = 0;
		}
	} else {
		ibmvscsis_free_cmd_qs(vscsi);
	}
}

/* Called with intr lock held */
static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi,
				    struct ibmvscsis_cmd *cmd,
				    struct viosrp_crq *crq)
{
	struct iu_entry *iue = cmd->iue;
	struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
	uint flag_bits = 0;
	long rc;

	dma_wmb();
	rc = h_copy_rdma(sizeof(struct mad_common),
			 vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
			 vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(crq->IU_data_ptr));
	if (!rc) {
		cmd->rsp.format = VIOSRP_MAD_FORMAT;
		cmd->rsp.len = sizeof(struct mad_common);
		cmd->rsp.tag = mad->tag;
		list_add_tail(&cmd->list, &vscsi->waiting_rsp);
		ibmvscsis_send_messages(vscsi);
	} else {
		pr_debug("Error sending mad response, rc %ld\n", rc);
		if (rc == H_PERMISSION) {
			if (connection_broken(vscsi))
				flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
		}
		dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n",
			rc);

		ibmvscsis_free_cmd_resources(vscsi, cmd);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
					  flag_bits);
	}
}

/**
 * ibmvscsis_mad() - Service a MAnagement Data gram.
 * @vscsi:	Pointer to our adapter structure
 * @crq:	Pointer to the CRQ entry containing the MAD request
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, called with adapter lock held
 */
static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq)
{
	struct iu_entry *iue;
	struct ibmvscsis_cmd *cmd;
	struct mad_common *mad;
	long rc = ADAPT_SUCCESS;

	switch (vscsi->state) {
		/*
		 * We have not exchanged Init Msgs yet, so this MAD was sent
		 * before the last Transport Event; client will not be
		 * expecting a response.
		 */
	case WAIT_CONNECTION:
		pr_debug("mad: in Wait Connection state, ignoring MAD, flags %d\n",
			 vscsi->flags);
		return ADAPT_SUCCESS;

	case SRP_PROCESSING:
	case CONNECTED:
		break;

		/*
		 * We should never get here while we're in these states.
		 * Just log an error and get out.
		 */
	case UNCONFIGURING:
	case WAIT_IDLE:
	case ERR_DISCONNECT:
	case ERR_DISCONNECT_RECONNECT:
	default:
		dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n",
			vscsi->state);
		return ADAPT_SUCCESS;
	}

	cmd = ibmvscsis_get_free_cmd(vscsi);
	if (!cmd) {
		dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n",
			vscsi->debit);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		return ERROR;
	}
	iue = cmd->iue;
	cmd->type = ADAPTER_MAD;

	rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
	if (!rc) {
		mad = (struct mad_common *)&vio_iu(iue)->mad;

		pr_debug("mad: type %d\n", be32_to_cpu(mad->type));

		rc = ibmvscsis_process_mad(vscsi, iue);

		pr_debug("mad: status %hd, rc %ld\n", be16_to_cpu(mad->status),
			 rc);

		if (!rc)
			ibmvscsis_send_mad_resp(vscsi, cmd, crq);
	} else {
		ibmvscsis_free_cmd_resources(vscsi, cmd);
	}

	pr_debug("Leaving mad, rc %ld\n", rc);
	return rc;
}

/**
 * ibmvscsis_login_rsp() - Create/copy a login response notice to the client
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Pointer to the command for the SRP Login request
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, interrupt lock held
 */
static long ibmvscsis_login_rsp(struct scsi_info *vscsi,
				struct ibmvscsis_cmd *cmd)
{
	struct iu_entry *iue = cmd->iue;
	struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp;
	struct format_code *fmt;
	uint flag_bits = 0;
	long rc = ADAPT_SUCCESS;

	memset(rsp, 0, sizeof(struct srp_login_rsp));

	rsp->opcode = SRP_LOGIN_RSP;
	rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit);
	rsp->tag = cmd->rsp.tag;
	rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
	rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
	fmt = (struct format_code *)&rsp->buf_fmt;
	fmt->buffers = SUPPORTED_FORMATS;
	vscsi->credit = 0;

	cmd->rsp.len = sizeof(struct srp_login_rsp);

	dma_wmb();
	rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
			 iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(iue->remote_token));

	switch (rc) {
	case H_SUCCESS:
		break;

	case H_PERMISSION:
		if (connection_broken(vscsi))
			flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
		dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
					  flag_bits);
		break;
	case H_SOURCE_PARM:
	case H_DEST_PARM:
	default:
		dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		break;
	}

	return rc;
}

/**
 * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Pointer to the command for the SRP Login request
 * @reason:	The reason the SRP Login is being rejected, per SRP protocol
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, interrupt lock held
 */
static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi,
				    struct ibmvscsis_cmd *cmd, u32 reason)
{
	struct iu_entry *iue = cmd->iue;
	struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej;
	struct format_code *fmt;
	uint flag_bits = 0;
	long rc = ADAPT_SUCCESS;

	memset(rej, 0, sizeof(*rej));

	rej->opcode = SRP_LOGIN_REJ;
	rej->reason = cpu_to_be32(reason);
	rej->tag = cmd->rsp.tag;
	fmt = (struct format_code *)&rej->buf_fmt;
	fmt->buffers = SUPPORTED_FORMATS;

	cmd->rsp.len = sizeof(*rej);

	dma_wmb();
	rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
			 iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(iue->remote_token));

	switch (rc) {
	case H_SUCCESS:
		break;
	case H_PERMISSION:
		if (connection_broken(vscsi))
			flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
		dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
					  flag_bits);
		break;
	case H_SOURCE_PARM:
	case H_DEST_PARM:
	default:
		dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		break;
	}

	return rc;
}

static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport)
{
	char *name = tport->tport_name;
	struct ibmvscsis_nexus *nexus;
	int rc;

	if (tport->ibmv_nexus) {
		pr_debug("tport->ibmv_nexus already exists\n");
		return 0;
	}

	nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
	if (!nexus) {
		pr_err("Unable to allocate struct ibmvscsis_nexus\n");
		return -ENOMEM;
	}

	nexus->se_sess = target_alloc_session(&tport->se_tpg, 0, 0,
					      TARGET_PROT_NORMAL, name, nexus,
					      NULL);
	if (IS_ERR(nexus->se_sess)) {
		rc = PTR_ERR(nexus->se_sess);
		goto transport_init_fail;
	}

	tport->ibmv_nexus = nexus;

	return 0;

transport_init_fail:
	kfree(nexus);
	return rc;
}

static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport)
{
	struct se_session *se_sess;
	struct ibmvscsis_nexus *nexus;

	nexus = tport->ibmv_nexus;
	if (!nexus)
		return -ENODEV;

	se_sess = nexus->se_sess;
	if (!se_sess)
		return -ENODEV;

	/*
	 * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port
	 */
	target_wait_for_sess_cmds(se_sess);
	transport_deregister_session_configfs(se_sess);
	transport_deregister_session(se_sess);
	tport->ibmv_nexus = NULL;
	kfree(nexus);

	return 0;
}

/**
 * ibmvscsis_srp_login() - Process an SRP Login Request
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Command element to use to process the SRP Login request
 * @crq:	Pointer to CRQ entry containing the SRP Login request
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, called with interrupt lock held
 */
static long ibmvscsis_srp_login(struct scsi_info *vscsi,
				struct ibmvscsis_cmd *cmd,
				struct viosrp_crq *crq)
{
	struct iu_entry *iue = cmd->iue;
	struct srp_login_req *req = &vio_iu(iue)->srp.login_req;
	struct port_id {
		__be64 id_extension;
		__be64 io_guid;
	} *iport, *tport;
	struct format_code *fmt;
	u32 reason = 0x0;
	long rc = ADAPT_SUCCESS;

	iport = (struct port_id *)req->initiator_port_id;
	tport = (struct port_id *)req->target_port_id;
	fmt = (struct format_code *)&req->req_buf_fmt;
	if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN)
		reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE;
	else if (be32_to_cpu(req->req_it_iu_len) < 64)
		reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
	else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) ||
		 (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1)))
		reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL;
	else if (req->req_flags & SRP_MULTICHAN_MULTI)
		reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED;
	else if (fmt->buffers & (~SUPPORTED_FORMATS))
		reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
	else if ((fmt->buffers & SUPPORTED_FORMATS) == 0)
		reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;

	if (vscsi->state == SRP_PROCESSING)
		reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED;

	rc = ibmvscsis_make_nexus(&vscsi->tport);
	if (rc)
		reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;

	cmd->rsp.format = VIOSRP_SRP_FORMAT;
	cmd->rsp.tag = req->tag;

	pr_debug("srp_login: reason 0x%x\n", reason);

	if (reason)
		rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason);
	else
		rc = ibmvscsis_login_rsp(vscsi, cmd);

	if (!rc) {
		if (!reason)
			vscsi->state = SRP_PROCESSING;

		list_add_tail(&cmd->list, &vscsi->waiting_rsp);
		ibmvscsis_send_messages(vscsi);
	} else {
		ibmvscsis_free_cmd_resources(vscsi, cmd);
	}

	pr_debug("Leaving srp_login, rc %ld\n", rc);
	return rc;
}

/**
 * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Command element to use to process the Implicit Logout request
 * @crq:	Pointer to CRQ entry containing the Implicit Logout request
 *
 * Do the logic to close the I_T nexus.  This function may not
 * behave to specification.
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, interrupt lock held
 */
static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi,
				   struct ibmvscsis_cmd *cmd,
				   struct viosrp_crq *crq)
{
	struct iu_entry *iue = cmd->iue;
	struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout;
	long rc = ADAPT_SUCCESS;

	if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) ||
	    !list_empty(&vscsi->waiting_rsp)) {
		dev_err(&vscsi->dev, "i_logout: outstanding work\n");
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
	} else {
		cmd->rsp.format = SRP_FORMAT;
		cmd->rsp.tag = log_out->tag;
		cmd->rsp.len = sizeof(struct mad_common);
		list_add_tail(&cmd->list, &vscsi->waiting_rsp);
		ibmvscsis_send_messages(vscsi);

		ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
	}

	return rc;
}

/* Called with intr lock held */
static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq)
{
	struct ibmvscsis_cmd *cmd;
	struct iu_entry *iue;
	struct srp_cmd *srp;
	struct srp_tsk_mgmt *tsk;
	long rc;

	if (vscsi->request_limit - vscsi->debit <= 0) {
		/* Client has exceeded request limit */
		dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n",
			vscsi->request_limit, vscsi->debit);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		return;
	}

	cmd = ibmvscsis_get_free_cmd(vscsi);
	if (!cmd) {
		dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n",
			vscsi->debit);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		return;
	}
	iue = cmd->iue;
	srp = &vio_iu(iue)->srp.cmd;

	rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
	if (rc) {
		ibmvscsis_free_cmd_resources(vscsi, cmd);
		return;
	}

	if (vscsi->state == SRP_PROCESSING) {
		switch (srp->opcode) {
		case SRP_LOGIN_REQ:
			rc = ibmvscsis_srp_login(vscsi, cmd, crq);
			break;

		case SRP_TSK_MGMT:
			tsk = &vio_iu(iue)->srp.tsk_mgmt;
			pr_debug("tsk_mgmt tag: %llu (0x%llx)\n", tsk->tag,
				 tsk->tag);
			cmd->rsp.tag = tsk->tag;
			vscsi->debit += 1;
			cmd->type = TASK_MANAGEMENT;
			list_add_tail(&cmd->list, &vscsi->schedule_q);
			queue_work(vscsi->work_q, &cmd->work);
			break;

		case SRP_CMD:
			pr_debug("srp_cmd tag: %llu (0x%llx)\n", srp->tag,
				 srp->tag);
			cmd->rsp.tag = srp->tag;
			vscsi->debit += 1;
			cmd->type = SCSI_CDB;
			/*
			 * We want to keep track of work waiting for
			 * the workqueue.
			 */
			list_add_tail(&cmd->list, &vscsi->schedule_q);
			queue_work(vscsi->work_q, &cmd->work);
			break;

		case SRP_I_LOGOUT:
			rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq);
			break;

		case SRP_CRED_RSP:
		case SRP_AER_RSP:
		default:
			ibmvscsis_free_cmd_resources(vscsi, cmd);
			dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n",
				(uint)srp->opcode);
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT, 0);
			break;
		}
	} else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) {
		rc = ibmvscsis_srp_login(vscsi, cmd, crq);
	} else {
		ibmvscsis_free_cmd_resources(vscsi, cmd);
		dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n",
			vscsi->state);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
	}
}

/**
 * ibmvscsis_ping_response() - Respond to a ping request
 * @vscsi:	Pointer to our adapter structure
 *
 * Let the client know that the server is alive and waiting on
 * its native I/O stack.
 * If any type of error occurs from the call to queue a ping
 * response then the client is either not accepting or receiving
 * interrupts.  Disconnect with an error.
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, interrupt lock held
 */
static long ibmvscsis_ping_response(struct scsi_info *vscsi)
{
	struct viosrp_crq *crq;
	u64 buffer[2] = { 0, 0 };
	long rc;

	crq = (struct viosrp_crq *)&buffer;
	crq->valid = VALID_CMD_RESP_EL;
	crq->format = (u8)MESSAGE_IN_CRQ;
	crq->status = PING_RESPONSE;

	rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
			cpu_to_be64(buffer[MSG_LOW]));

	switch (rc) {
	case H_SUCCESS:
		break;
	case H_CLOSED:
		vscsi->flags |= CLIENT_FAILED;
	case H_DROPPED:
		vscsi->flags |= RESPONSE_Q_DOWN;
	case H_REMOTE_PARM:
		dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		break;
	default:
		dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n",
			rc);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
		break;
	}

	return rc;
}

/**
 * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue.
 * @vscsi:	Pointer to our adapter structure
 * @crq:	Pointer to CRQ element containing the SRP request
 *
 * This function will return success if the command queue element is valid
 * and the srp iu or MAD request it pointed to was also valid.  That does
 * not mean that an error was not returned to the client.
 *
 * EXECUTION ENVIRONMENT:
 *	Interrupt, intr lock held
 */
static long ibmvscsis_parse_command(struct scsi_info *vscsi,
				    struct viosrp_crq *crq)
{
	long rc = ADAPT_SUCCESS;

	switch (crq->valid) {
	case VALID_CMD_RESP_EL:
		switch (crq->format) {
		case OS400_FORMAT:
		case AIX_FORMAT:
		case LINUX_FORMAT:
		case MAD_FORMAT:
			if (vscsi->flags & PROCESSING_MAD) {
				rc = ERROR;
				dev_err(&vscsi->dev, "parse_command: already processing mad\n");
				ibmvscsis_post_disconnect(vscsi,
						       ERR_DISCONNECT_RECONNECT,
						       0);
			} else {
				vscsi->flags |= PROCESSING_MAD;
				rc = ibmvscsis_mad(vscsi, crq);
			}
			break;

		case SRP_FORMAT:
			ibmvscsis_srp_cmd(vscsi, crq);
			break;

		case MESSAGE_IN_CRQ:
			if (crq->status == PING)
				ibmvscsis_ping_response(vscsi);
			break;

		default:
			dev_err(&vscsi->dev, "parse_command: invalid format %d\n",
				(uint)crq->format);
			ibmvscsis_post_disconnect(vscsi,
						  ERR_DISCONNECT_RECONNECT, 0);
			break;
		}
		break;

	case VALID_TRANS_EVENT:
		rc = ibmvscsis_trans_event(vscsi, crq);
		break;

	case VALID_INIT_MSG:
		rc = ibmvscsis_init_msg(vscsi, crq);
		break;

	default:
		dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n",
			(uint)crq->valid);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		break;
	}

	/*
	 * Return only what the interrupt handler cares
	 * about. Most errors we keep right on trucking.
	 */
	rc = vscsi->flags & SCHEDULE_DISCONNECT;

	return rc;
}

static int read_dma_window(struct scsi_info *vscsi)
{
	struct vio_dev *vdev = vscsi->dma_dev;
	const __be32 *dma_window;
	const __be32 *prop;

	/* TODO Using of_parse_dma_window would be better, but it doesn't give
	 * a way to read multiple windows without already knowing the size of
	 * a window or the number of windows.
	 */
	dma_window = (const __be32 *)vio_get_attribute(vdev,
						       "ibm,my-dma-window",
						       NULL);
	if (!dma_window) {
		pr_err("Couldn't find ibm,my-dma-window property\n");
		return -1;
	}

	vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window);
	dma_window++;

	prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells",
						 NULL);
	if (!prop) {
		pr_warn("Couldn't find ibm,#dma-address-cells property\n");
		dma_window++;
	} else {
		dma_window += be32_to_cpu(*prop);
	}

	prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells",
						 NULL);
	if (!prop) {
		pr_warn("Couldn't find ibm,#dma-size-cells property\n");
		dma_window++;
	} else {
		dma_window += be32_to_cpu(*prop);
	}

	/* dma_window should point to the second window now */
	vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window);

	return 0;
}

static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name)
{
	struct ibmvscsis_tport *tport = NULL;
	struct vio_dev *vdev;
	struct scsi_info *vscsi;

	spin_lock_bh(&ibmvscsis_dev_lock);
	list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) {
		vdev = vscsi->dma_dev;
		if (!strcmp(dev_name(&vdev->dev), name)) {
			tport = &vscsi->tport;
			break;
		}
	}
	spin_unlock_bh(&ibmvscsis_dev_lock);

	return tport;
}

/**
 * ibmvscsis_parse_cmd() - Parse SRP Command
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Pointer to command element with SRP command
 *
 * Parse the srp command; if it is valid then submit it to tcm.
 * Note: The return code does not reflect the status of the SCSI CDB.
 *
 * EXECUTION ENVIRONMENT:
 *	Process level
 */
static void ibmvscsis_parse_cmd(struct scsi_info *vscsi,
				struct ibmvscsis_cmd *cmd)
{
	struct iu_entry *iue = cmd->iue;
	struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
	struct ibmvscsis_nexus *nexus;
	u64 data_len = 0;
	enum dma_data_direction dir;
	int attr = 0;
	int rc = 0;

	nexus = vscsi->tport.ibmv_nexus;
	/*
	 * additional length in bytes.  Note that the SRP spec says that
	 * additional length is in 4-byte words, but technically the
	 * additional length field is only the upper 6 bits of the byte.
	 * The lower 2 bits are reserved.  If the lower 2 bits are 0 (as
	 * all reserved fields should be), then interpreting the byte as
	 * an int will yield the length in bytes.
	 */
	if (srp->add_cdb_len & 0x03) {
		dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n");
		spin_lock_bh(&vscsi->intr_lock);
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
		ibmvscsis_free_cmd_resources(vscsi, cmd);
		spin_unlock_bh(&vscsi->intr_lock);
		return;
	}

	if (srp_get_desc_table(srp, &dir, &data_len)) {
		dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n",
			srp->tag);
		goto fail;
	}

	cmd->rsp.sol_not = srp->sol_not;

	switch (srp->task_attr) {
	case SRP_SIMPLE_TASK:
		attr = TCM_SIMPLE_TAG;
		break;
	case SRP_ORDERED_TASK:
		attr = TCM_ORDERED_TAG;
		break;
	case SRP_HEAD_TASK:
		attr = TCM_HEAD_TAG;
		break;
	case SRP_ACA_TASK:
		attr = TCM_ACA_TAG;
		break;
	default:
		dev_err(&vscsi->dev, "Invalid task attribute %d\n",
			srp->task_attr);
		goto fail;
	}

	cmd->se_cmd.tag = be64_to_cpu(srp->tag);

	spin_lock_bh(&vscsi->intr_lock);
	list_add_tail(&cmd->list, &vscsi->active_q);
	spin_unlock_bh(&vscsi->intr_lock);

	srp->lun.scsi_lun[0] &= 0x3f;

	rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb,
			       cmd->sense_buf, scsilun_to_int(&srp->lun),
			       data_len, attr, dir, 0);
	if (rc) {
		dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc);
		spin_lock_bh(&vscsi->intr_lock);
		list_del(&cmd->list);
		ibmvscsis_free_cmd_resources(vscsi, cmd);
		spin_unlock_bh(&vscsi->intr_lock);
		goto fail;
	}
	return;

fail:
	spin_lock_bh(&vscsi->intr_lock);
	ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
	spin_unlock_bh(&vscsi->intr_lock);
}

/**
 * ibmvscsis_parse_task() - Parse SRP Task Management Request
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Pointer to command element with SRP task management request
 *
 * Parse the srp task management request; if it is valid then submit it to tcm.
 * Note: The return code does not reflect the status of the task management
 * request.
 *
 * EXECUTION ENVIRONMENT:
 *	Processor level
 */
static void ibmvscsis_parse_task(struct scsi_info *vscsi,
				 struct ibmvscsis_cmd *cmd)
{
	struct iu_entry *iue = cmd->iue;
	struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
	int tcm_type;
	u64 tag_to_abort = 0;
	int rc = 0;
	struct ibmvscsis_nexus *nexus;

	nexus = vscsi->tport.ibmv_nexus;

	cmd->rsp.sol_not = srp_tsk->sol_not;

	switch (srp_tsk->tsk_mgmt_func) {
	case SRP_TSK_ABORT_TASK:
		tcm_type = TMR_ABORT_TASK;
		tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
		break;
	case SRP_TSK_ABORT_TASK_SET:
		tcm_type = TMR_ABORT_TASK_SET;
		break;
	case SRP_TSK_CLEAR_TASK_SET:
		tcm_type = TMR_CLEAR_TASK_SET;
		break;
	case SRP_TSK_LUN_RESET:
		tcm_type = TMR_LUN_RESET;
		break;
	case SRP_TSK_CLEAR_ACA:
		tcm_type = TMR_CLEAR_ACA;
		break;
	default:
		dev_err(&vscsi->dev, "unknown task mgmt func %d\n",
			srp_tsk->tsk_mgmt_func);
		cmd->se_cmd.se_tmr_req->response =
			TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
		rc = -1;
		break;
	}

	if (!rc) {
		cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag);

		spin_lock_bh(&vscsi->intr_lock);
		list_add_tail(&cmd->list, &vscsi->active_q);
		spin_unlock_bh(&vscsi->intr_lock);

		srp_tsk->lun.scsi_lun[0] &= 0x3f;

		pr_debug("calling submit_tmr, func %d\n",
			 srp_tsk->tsk_mgmt_func);
		rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL,
				       scsilun_to_int(&srp_tsk->lun), srp_tsk,
				       tcm_type, GFP_KERNEL, tag_to_abort, 0);
		if (rc) {
			dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n",
				rc);
			spin_lock_bh(&vscsi->intr_lock);
			list_del(&cmd->list);
			spin_unlock_bh(&vscsi->intr_lock);
			cmd->se_cmd.se_tmr_req->response =
				TMR_FUNCTION_REJECTED;
		}
	}

	if (rc)
		transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0);
}

static void ibmvscsis_scheduler(struct work_struct *work)
{
	struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd,
						 work);
	struct scsi_info *vscsi = cmd->adapter;

	spin_lock_bh(&vscsi->intr_lock);

	/* Remove from schedule_q */
	list_del(&cmd->list);

	/* Don't submit cmd if we're disconnecting */
	if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) {
		ibmvscsis_free_cmd_resources(vscsi, cmd);

		/* ibmvscsis_disconnect might be waiting for us */
		if (list_empty(&vscsi->active_q) &&
		    list_empty(&vscsi->schedule_q) &&
		    (vscsi->flags & WAIT_FOR_IDLE)) {
			vscsi->flags &= ~WAIT_FOR_IDLE;
			complete(&vscsi->wait_idle);
		}

		spin_unlock_bh(&vscsi->intr_lock);
		return;
	}

	spin_unlock_bh(&vscsi->intr_lock);

	switch (cmd->type) {
	case SCSI_CDB:
		ibmvscsis_parse_cmd(vscsi, cmd);
		break;
	case TASK_MANAGEMENT:
		ibmvscsis_parse_task(vscsi, cmd);
		break;
	default:
		dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n",
			cmd->type);
		spin_lock_bh(&vscsi->intr_lock);
		ibmvscsis_free_cmd_resources(vscsi, cmd);
		spin_unlock_bh(&vscsi->intr_lock);
		break;
	}
}

static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num)
{
	struct ibmvscsis_cmd *cmd;
	int i;

	INIT_LIST_HEAD(&vscsi->free_cmd);
	vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd),
				  GFP_KERNEL);
	if (!vscsi->cmd_pool)
		return -ENOMEM;

	for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num;
	     i++, cmd++) {
		cmd->abort_cmd = NULL;
		cmd->adapter = vscsi;
		INIT_WORK(&cmd->work, ibmvscsis_scheduler);
		list_add_tail(&cmd->list, &vscsi->free_cmd);
	}

	return 0;
}

static void ibmvscsis_free_cmds(struct scsi_info *vscsi)
{
	kfree(vscsi->cmd_pool);
	vscsi->cmd_pool = NULL;
	INIT_LIST_HEAD(&vscsi->free_cmd);
}

/**
 * ibmvscsis_service_wait_q() - Service Waiting Queue
 * @timer:	Pointer to timer which has expired
 *
 * This routine is called when the timer pops to service the waiting
 * queue. Elements on the queue have completed, their responses have been
 * copied to the client, but the client's response queue was full so
 * the queue message could not be sent. The routine grabs the proper locks
 * and calls send messages.
 *
 * EXECUTION ENVIRONMENT:
 *	called at interrupt level
 */
static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer)
{
	struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer);
	struct scsi_info *vscsi = container_of(p_timer, struct scsi_info,
					       rsp_q_timer);

	spin_lock_bh(&vscsi->intr_lock);
	p_timer->timer_pops += 1;
	p_timer->started = false;
	ibmvscsis_send_messages(vscsi);
	spin_unlock_bh(&vscsi->intr_lock);

	return HRTIMER_NORESTART;
}

static long ibmvscsis_alloctimer(struct scsi_info *vscsi)
{
	struct timer_cb *p_timer;

	p_timer = &vscsi->rsp_q_timer;
	hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);

	p_timer->timer.function = ibmvscsis_service_wait_q;
	p_timer->started = false;
	p_timer->timer_pops = 0;

	return ADAPT_SUCCESS;
}

static void ibmvscsis_freetimer(struct scsi_info *vscsi)
{
	struct timer_cb *p_timer;

	p_timer = &vscsi->rsp_q_timer;

	(void)hrtimer_cancel(&p_timer->timer);

	p_timer->started = false;
	p_timer->timer_pops = 0;
}

static irqreturn_t ibmvscsis_interrupt(int dummy, void *data)
{
	struct scsi_info *vscsi = data;

	vio_disable_interrupts(vscsi->dma_dev);
	tasklet_schedule(&vscsi->work_task);

	return IRQ_HANDLED;
}

/**
 * ibmvscsis_enable_change_state() - Set new state based on enabled status
 * @vscsi:	Pointer to our adapter structure
 *
 * This function determines our new state now that we are enabled.  This
 * may involve sending an Init Complete message to the client.
 *
 * Must be called with interrupt lock held.
 */
static long ibmvscsis_enable_change_state(struct scsi_info *vscsi)
{
	int bytes;
	long rc = ADAPT_SUCCESS;

	bytes = vscsi->cmd_q.size * PAGE_SIZE;
	rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes);
	if (rc == H_CLOSED || rc == H_SUCCESS) {
		vscsi->state = WAIT_CONNECTION;
		rc = ibmvscsis_establish_new_q(vscsi);
	}

	if (rc != ADAPT_SUCCESS) {
		vscsi->state = ERR_DISCONNECTED;
		vscsi->flags |= RESPONSE_Q_DOWN;
	}

	return rc;
}

/**
 * ibmvscsis_create_command_q() - Create Command Queue
 * @vscsi:	Pointer to our adapter structure
 * @num_cmds:	Currently unused.  In the future, may be used to determine
 *		the size of the CRQ.
 *
 * Allocates memory for command queue maps remote memory into an ioba
 * initializes the command response queue
 *
 * EXECUTION ENVIRONMENT:
 *	Process level only
 */
static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds)
{
	int pages;
	struct vio_dev *vdev = vscsi->dma_dev;

	/* We might support multiple pages in the future, but just 1 for now */
	pages = 1;

	vscsi->cmd_q.size = pages;

	vscsi->cmd_q.base_addr =
		(struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
	if (!vscsi->cmd_q.base_addr)
		return -ENOMEM;

	vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1;

	vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev,
						vscsi->cmd_q.base_addr,
						PAGE_SIZE, DMA_BIDIRECTIONAL);
	if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) {
		free_page((unsigned long)vscsi->cmd_q.base_addr);
		return -ENOMEM;
	}

	return 0;
}

/**
 * ibmvscsis_destroy_command_q - Destroy Command Queue
 * @vscsi:	Pointer to our adapter structure
 *
 * Releases memory for command queue and unmaps mapped remote memory.
 *
 * EXECUTION ENVIRONMENT:
 *	Process level only
 */
static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi)
{
	dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token,
			 PAGE_SIZE, DMA_BIDIRECTIONAL);
	free_page((unsigned long)vscsi->cmd_q.base_addr);
	vscsi->cmd_q.base_addr = NULL;
	vscsi->state = NO_QUEUE;
}

static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi,
			      struct ibmvscsis_cmd *cmd)
{
	struct iu_entry *iue = cmd->iue;
	struct se_cmd *se_cmd = &cmd->se_cmd;
	struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
	struct scsi_sense_hdr sshdr;
	u8 rc = se_cmd->scsi_status;

	if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb)))
		if (scsi_normalize_sense(se_cmd->sense_buffer,
					 se_cmd->scsi_sense_length, &sshdr))
			if (sshdr.sense_key == HARDWARE_ERROR &&
			    (se_cmd->residual_count == 0 ||
			     se_cmd->residual_count == se_cmd->data_length)) {
				rc = NO_SENSE;
				cmd->flags |= CMD_FAST_FAIL;
			}

	return rc;
}

/**
 * srp_build_response() - Build an SRP response buffer
 * @vscsi:	Pointer to our adapter structure
 * @cmd:	Pointer to command for which to send the response
 * @len_p:	Where to return the length of the IU response sent.  This
 *		is needed to construct the CRQ response.
 *
 * Build the SRP response buffer and copy it to the client's memory space.
 */
static long srp_build_response(struct scsi_info *vscsi,
			       struct ibmvscsis_cmd *cmd, uint *len_p)
{
	struct iu_entry *iue = cmd->iue;
	struct se_cmd *se_cmd = &cmd->se_cmd;
	struct srp_rsp *rsp;
	uint len;
	u32 rsp_code;
	char *data;
	u32 *tsk_status;
	long rc = ADAPT_SUCCESS;

	spin_lock_bh(&vscsi->intr_lock);

	rsp = &vio_iu(iue)->srp.rsp;
	len = sizeof(*rsp);
	memset(rsp, 0, len);
	data = rsp->data;

	rsp->opcode = SRP_RSP;

	rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit);
	rsp->tag = cmd->rsp.tag;
	rsp->flags = 0;

	if (cmd->type == SCSI_CDB) {
		rsp->status = ibmvscsis_fast_fail(vscsi, cmd);
		if (rsp->status) {
			pr_debug("build_resp: cmd %p, scsi status %d\n", cmd,
				 (int)rsp->status);
			ibmvscsis_determine_resid(se_cmd, rsp);
			if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) {
				rsp->sense_data_len =
					cpu_to_be32(se_cmd->scsi_sense_length);
				rsp->flags |= SRP_RSP_FLAG_SNSVALID;
				len += se_cmd->scsi_sense_length;
				memcpy(data, se_cmd->sense_buffer,
				       se_cmd->scsi_sense_length);
			}
			rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
				UCSOLNT_RESP_SHIFT;
		} else if (cmd->flags & CMD_FAST_FAIL) {
			pr_debug("build_resp: cmd %p, fast fail\n", cmd);
			rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
				UCSOLNT_RESP_SHIFT;
		} else {
			rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
				SCSOLNT_RESP_SHIFT;
		}
	} else {
		/* this is task management */
		rsp->status = 0;
		rsp->resp_data_len = cpu_to_be32(4);
		rsp->flags |= SRP_RSP_FLAG_RSPVALID;

		switch (se_cmd->se_tmr_req->response) {
		case TMR_FUNCTION_COMPLETE:
		case TMR_TASK_DOES_NOT_EXIST:
			rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE;
			rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
				SCSOLNT_RESP_SHIFT;
			break;
		case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
		case TMR_LUN_DOES_NOT_EXIST:
			rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED;
			rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
				UCSOLNT_RESP_SHIFT;
			break;
		case TMR_FUNCTION_FAILED:
		case TMR_FUNCTION_REJECTED:
		default:
			rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED;
			rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
				UCSOLNT_RESP_SHIFT;
			break;
		}

		tsk_status = (u32 *)data;
		*tsk_status = cpu_to_be32(rsp_code);
		data = (char *)(tsk_status + 1);
		len += 4;
	}

	dma_wmb();
	rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
			 vscsi->dds.window[REMOTE].liobn,
			 be64_to_cpu(iue->remote_token));

	switch (rc) {
	case H_SUCCESS:
		vscsi->credit = 0;
		*len_p = len;
		break;
	case H_PERMISSION:
		if (connection_broken(vscsi))
			vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED;

		dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n",
			rc, vscsi->flags, vscsi->state);
		break;
	case H_SOURCE_PARM:
	case H_DEST_PARM:
	default:
		dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n",
			rc);
		break;
	}

	spin_unlock_bh(&vscsi->intr_lock);

	return rc;
}

static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg,
			  int nsg, struct srp_direct_buf *md, int nmd,
			  enum dma_data_direction dir, unsigned int bytes)
{
	struct iu_entry *iue = cmd->iue;
	struct srp_target *target = iue->target;
	struct scsi_info *vscsi = target->ldata;
	struct scatterlist *sgp;
	dma_addr_t client_ioba, server_ioba;
	ulong buf_len;
	ulong client_len, server_len;
	int md_idx;
	long tx_len;
	long rc = 0;

	if (bytes == 0)
		return 0;

	sgp = sg;
	client_len = 0;
	server_len = 0;
	md_idx = 0;
	tx_len = bytes;

	do {
		if (client_len == 0) {
			if (md_idx >= nmd) {
				dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n");
				rc = -EIO;
				break;
			}
			client_ioba = be64_to_cpu(md[md_idx].va);
			client_len = be32_to_cpu(md[md_idx].len);
		}
		if (server_len == 0) {
			if (!sgp) {
				dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n");
				rc = -EIO;
				break;
			}
			server_ioba = sg_dma_address(sgp);
			server_len = sg_dma_len(sgp);
		}

		buf_len = tx_len;

		if (buf_len > client_len)
			buf_len = client_len;

		if (buf_len > server_len)
			buf_len = server_len;

		if (buf_len > max_vdma_size)
			buf_len = max_vdma_size;

		if (dir == DMA_TO_DEVICE) {
			/* read from client */
			rc = h_copy_rdma(buf_len,
					 vscsi->dds.window[REMOTE].liobn,
					 client_ioba,
					 vscsi->dds.window[LOCAL].liobn,
					 server_ioba);
		} else {
			/* The h_copy_rdma will cause phyp, running in another
			 * partition, to read memory, so we need to make sure
			 * the data has been written out, hence these syncs.
			 */
			/* ensure that everything is in memory */
			isync();
			/* ensure that memory has been made visible */
			dma_wmb();
			rc = h_copy_rdma(buf_len,
					 vscsi->dds.window[LOCAL].liobn,
					 server_ioba,
					 vscsi->dds.window[REMOTE].liobn,
					 client_ioba);
		}
		switch (rc) {
		case H_SUCCESS:
			break;
		case H_PERMISSION:
		case H_SOURCE_PARM:
		case H_DEST_PARM:
			if (connection_broken(vscsi)) {
				spin_lock_bh(&vscsi->intr_lock);
				vscsi->flags |=
					(RESPONSE_Q_DOWN | CLIENT_FAILED);
				spin_unlock_bh(&vscsi->intr_lock);
			}
			dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n",
				rc);
			break;

		default:
			dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n",
				rc);
			break;
		}

		if (!rc) {
			tx_len -= buf_len;
			if (tx_len) {
				client_len -= buf_len;
				if (client_len == 0)
					md_idx++;
				else
					client_ioba += buf_len;

				server_len -= buf_len;
				if (server_len == 0)
					sgp = sg_next(sgp);
				else
					server_ioba += buf_len;
			} else {
				break;
			}
		}
	} while (!rc);

	return rc;
}

/**
 * ibmvscsis_handle_crq() - Handle CRQ
 * @data:	Pointer to our adapter structure
 *
 * Read the command elements from the command queue and copy the payloads
 * associated with the command elements to local memory and execute the
 * SRP requests.
 *
 * Note: this is an edge triggered interrupt. It can not be shared.
 */
static void ibmvscsis_handle_crq(unsigned long data)
{
	struct scsi_info *vscsi = (struct scsi_info *)data;
	struct viosrp_crq *crq;
	long rc;
	bool ack = true;
	volatile u8 valid;

	spin_lock_bh(&vscsi->intr_lock);

	pr_debug("got interrupt\n");

	/*
	 * if we are in a path where we are waiting for all pending commands
	 * to complete because we received a transport event and anything in
	 * the command queue is for a new connection, do nothing
	 */
	if (TARGET_STOP(vscsi)) {
		vio_enable_interrupts(vscsi->dma_dev);

		pr_debug("handle_crq, don't process: flags 0x%x, state 0x%hx\n",
			 vscsi->flags, vscsi->state);
		spin_unlock_bh(&vscsi->intr_lock);
		return;
	}

	rc = vscsi->flags & SCHEDULE_DISCONNECT;
	crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
	valid = crq->valid;
	dma_rmb();

	while (valid) {
		/*
		 * These are edege triggered interrupts. After dropping out of
		 * the while loop, the code must check for work since an
		 * interrupt could be lost, and an elment be left on the queue,
		 * hence the label.
		 */
cmd_work:
		vscsi->cmd_q.index =
			(vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;

		if (!rc) {
			rc = ibmvscsis_parse_command(vscsi, crq);
		} else {
			if ((uint)crq->valid == VALID_TRANS_EVENT) {
				/*
				 * must service the transport layer events even
				 * in an error state, dont break out until all
				 * the consecutive transport events have been
				 * processed
				 */
				rc = ibmvscsis_trans_event(vscsi, crq);
			} else if (vscsi->flags & TRANS_EVENT) {
				/*
				 * if a transport event has occurred leave
				 * everything but transport events on the queue
				 *
				 * need to decrement the queue index so we can
				 * look at the element again
				 */
				if (vscsi->cmd_q.index)
					vscsi->cmd_q.index -= 1;
				else
					/*
					 * index is at 0 it just wrapped.
					 * have it index last element in q
					 */
					vscsi->cmd_q.index = vscsi->cmd_q.mask;
				break;
			}
		}

		crq->valid = INVALIDATE_CMD_RESP_EL;

		crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
		valid = crq->valid;
		dma_rmb();
	}

	if (!rc) {
		if (ack) {
			vio_enable_interrupts(vscsi->dma_dev);
			ack = false;
			pr_debug("handle_crq, reenabling interrupts\n");
		}
		valid = crq->valid;
		dma_rmb();
		if (valid)
			goto cmd_work;
	} else {
		pr_debug("handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n",
			 vscsi->flags, vscsi->state, vscsi->cmd_q.index);
	}

	pr_debug("Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n",
		 (int)list_empty(&vscsi->schedule_q), vscsi->flags,
		 vscsi->state);

	spin_unlock_bh(&vscsi->intr_lock);
}

static int ibmvscsis_probe(struct vio_dev *vdev,
			   const struct vio_device_id *id)
{
	struct scsi_info *vscsi;
	int rc = 0;
	long hrc = 0;
	char wq_name[24];

	vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL);
	if (!vscsi) {
		rc = -ENOMEM;
		pr_err("probe: allocation of adapter failed\n");
		return rc;
	}

	vscsi->dma_dev = vdev;
	vscsi->dev = vdev->dev;
	INIT_LIST_HEAD(&vscsi->schedule_q);
	INIT_LIST_HEAD(&vscsi->waiting_rsp);
	INIT_LIST_HEAD(&vscsi->active_q);

	snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s",
		 dev_name(&vdev->dev));

	pr_debug("probe tport_name: %s\n", vscsi->tport.tport_name);

	rc = read_dma_window(vscsi);
	if (rc)
		goto free_adapter;
	pr_debug("Probe: liobn 0x%x, riobn 0x%x\n",
		 vscsi->dds.window[LOCAL].liobn,
		 vscsi->dds.window[REMOTE].liobn);

	strcpy(vscsi->eye, "VSCSI ");
	strncat(vscsi->eye, vdev->name, MAX_EYE);

	vscsi->dds.unit_id = vdev->unit_address;
	strncpy(vscsi->dds.partition_name, partition_name,
		sizeof(vscsi->dds.partition_name));
	vscsi->dds.partition_num = partition_number;

	spin_lock_bh(&ibmvscsis_dev_lock);
	list_add_tail(&vscsi->list, &ibmvscsis_dev_list);
	spin_unlock_bh(&ibmvscsis_dev_lock);

	/*
	 * TBD: How do we determine # of cmds to request?  Do we know how
	 * many "children" we have?
	 */
	vscsi->request_limit = INITIAL_SRP_LIMIT;
	rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit,
			      SRP_MAX_IU_LEN);
	if (rc)
		goto rem_list;

	vscsi->target.ldata = vscsi;

	rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit);
	if (rc) {
		dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n",
			rc, vscsi->request_limit);
		goto free_target;
	}

	/*
	 * Note: the lock is used in freeing timers, so must initialize
	 * first so that ordering in case of error is correct.
	 */
	spin_lock_init(&vscsi->intr_lock);

	rc = ibmvscsis_alloctimer(vscsi);
	if (rc) {
		dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc);
		goto free_cmds;
	}

	rc = ibmvscsis_create_command_q(vscsi, 256);
	if (rc) {
		dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n",
			rc);
		goto free_timer;
	}

	vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
	if (!vscsi->map_buf) {
		rc = -ENOMEM;
		dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n");
		goto destroy_queue;
	}

	vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE,
					 DMA_BIDIRECTIONAL);
	if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) {
		rc = -ENOMEM;
		dev_err(&vscsi->dev, "probe: error mapping command buffer\n");
		goto free_buf;
	}

	hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
		       (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
		       0);
	if (hrc == H_SUCCESS)
		vscsi->client_data.partition_number =
			be64_to_cpu(*(u64 *)vscsi->map_buf);
	/*
	 * We expect the VIOCTL to fail if we're configured as "any
	 * client can connect" and the client isn't activated yet.
	 * We'll make the call again when he sends an init msg.
	 */
	pr_debug("probe hrc %ld, client partition num %d\n",
		 hrc, vscsi->client_data.partition_number);

	tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq,
		     (unsigned long)vscsi);

	init_completion(&vscsi->wait_idle);
	init_completion(&vscsi->unconfig);

	snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev));
	vscsi->work_q = create_workqueue(wq_name);
	if (!vscsi->work_q) {
		rc = -ENOMEM;
		dev_err(&vscsi->dev, "create_workqueue failed\n");
		goto unmap_buf;
	}

	rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi);
	if (rc) {
		rc = -EPERM;
		dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc);
		goto destroy_WQ;
	}

	vscsi->state = WAIT_ENABLED;

	dev_set_drvdata(&vdev->dev, vscsi);

	return 0;

destroy_WQ:
	destroy_workqueue(vscsi->work_q);
unmap_buf:
	dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
			 DMA_BIDIRECTIONAL);
free_buf:
	kfree(vscsi->map_buf);
destroy_queue:
	tasklet_kill(&vscsi->work_task);
	ibmvscsis_unregister_command_q(vscsi);
	ibmvscsis_destroy_command_q(vscsi);
free_timer:
	ibmvscsis_freetimer(vscsi);
free_cmds:
	ibmvscsis_free_cmds(vscsi);
free_target:
	srp_target_free(&vscsi->target);
rem_list:
	spin_lock_bh(&ibmvscsis_dev_lock);
	list_del(&vscsi->list);
	spin_unlock_bh(&ibmvscsis_dev_lock);
free_adapter:
	kfree(vscsi);

	return rc;
}

static int ibmvscsis_remove(struct vio_dev *vdev)
{
	struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev);

	pr_debug("remove (%s)\n", dev_name(&vscsi->dma_dev->dev));

	spin_lock_bh(&vscsi->intr_lock);
	ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0);
	vscsi->flags |= CFG_SLEEPING;
	spin_unlock_bh(&vscsi->intr_lock);
	wait_for_completion(&vscsi->unconfig);

	vio_disable_interrupts(vdev);
	free_irq(vdev->irq, vscsi);
	destroy_workqueue(vscsi->work_q);
	dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
			 DMA_BIDIRECTIONAL);
	kfree(vscsi->map_buf);
	tasklet_kill(&vscsi->work_task);
	ibmvscsis_destroy_command_q(vscsi);
	ibmvscsis_freetimer(vscsi);
	ibmvscsis_free_cmds(vscsi);
	srp_target_free(&vscsi->target);
	spin_lock_bh(&ibmvscsis_dev_lock);
	list_del(&vscsi->list);
	spin_unlock_bh(&ibmvscsis_dev_lock);
	kfree(vscsi);

	return 0;
}

static ssize_t system_id_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
}

static ssize_t partition_number_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
}

static ssize_t unit_address_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev);

	return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address);
}

static int ibmvscsis_get_system_info(void)
{
	struct device_node *rootdn, *vdevdn;
	const char *id, *model, *name;
	const uint *num;

	rootdn = of_find_node_by_path("/");
	if (!rootdn)
		return -ENOENT;

	model = of_get_property(rootdn, "model", NULL);
	id = of_get_property(rootdn, "system-id", NULL);
	if (model && id)
		snprintf(system_id, sizeof(system_id), "%s-%s", model, id);

	name = of_get_property(rootdn, "ibm,partition-name", NULL);
	if (name)
		strncpy(partition_name, name, sizeof(partition_name));

	num = of_get_property(rootdn, "ibm,partition-no", NULL);
	if (num)
		partition_number = of_read_number(num, 1);

	of_node_put(rootdn);

	vdevdn = of_find_node_by_path("/vdevice");
	if (vdevdn) {
		const uint *mvds;

		mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size",
				       NULL);
		if (mvds)
			max_vdma_size = *mvds;
		of_node_put(vdevdn);
	}

	return 0;
}

static char *ibmvscsis_get_fabric_name(void)
{
	return "ibmvscsis";
}

static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg)
{
	struct ibmvscsis_tport *tport =
		container_of(se_tpg, struct ibmvscsis_tport, se_tpg);

	return tport->tport_name;
}

static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg)
{
	struct ibmvscsis_tport *tport =
		container_of(se_tpg, struct ibmvscsis_tport, se_tpg);

	return tport->tport_tpgt;
}

static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg)
{
	return 1;
}

static int ibmvscsis_check_true(struct se_portal_group *se_tpg)
{
	return 1;
}

static int ibmvscsis_check_false(struct se_portal_group *se_tpg)
{
	return 0;
}

static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg)
{
	return 1;
}

static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd)
{
	return target_put_sess_cmd(se_cmd);
}

static void ibmvscsis_release_cmd(struct se_cmd *se_cmd)
{
	struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
						 se_cmd);
	struct scsi_info *vscsi = cmd->adapter;

	spin_lock_bh(&vscsi->intr_lock);
	/* Remove from active_q */
	list_move_tail(&cmd->list, &vscsi->waiting_rsp);
	ibmvscsis_send_messages(vscsi);
	spin_unlock_bh(&vscsi->intr_lock);
}

static u32 ibmvscsis_sess_get_index(struct se_session *se_sess)
{
	return 0;
}

static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
{
	struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
						 se_cmd);
	struct scsi_info *vscsi = cmd->adapter;
	struct iu_entry *iue = cmd->iue;
	int rc;

	/*
	 * If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success
	 * since LIO can't do anything about it, and we dont want to
	 * attempt an srp_transfer_data.
	 */
	if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) {
		pr_err("write_pending failed since: %d\n", vscsi->flags);
		return 0;
	}

	rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma,
			       1, 1);
	if (rc) {
		pr_err("srp_transfer_data() failed: %d\n", rc);
		return -EIO;
	}
	/*
	 * We now tell TCM to add this WRITE CDB directly into the TCM storage
	 * object execution queue.
	 */
	target_execute_cmd(se_cmd);
	return 0;
}

static int ibmvscsis_write_pending_status(struct se_cmd *se_cmd)
{
	return 0;
}

static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl)
{
}

static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd)
{
	return 0;
}

static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd)
{
	struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
						 se_cmd);
	struct iu_entry *iue = cmd->iue;
	struct scsi_info *vscsi = cmd->adapter;
	char *sd;
	uint len = 0;
	int rc;

	rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1,
			       1);
	if (rc) {
		pr_err("srp_transfer_data failed: %d\n", rc);
		sd = se_cmd->sense_buffer;
		se_cmd->scsi_sense_length = 18;
		memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length);
		/* Logical Unit Communication Time-out asc/ascq = 0x0801 */
		scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR,
					0x08, 0x01);
	}

	srp_build_response(vscsi, cmd, &len);
	cmd->rsp.format = SRP_FORMAT;
	cmd->rsp.len = len;

	return 0;
}

static int ibmvscsis_queue_status(struct se_cmd *se_cmd)
{
	struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
						 se_cmd);
	struct scsi_info *vscsi = cmd->adapter;
	uint len;

	pr_debug("queue_status %p\n", se_cmd);

	srp_build_response(vscsi, cmd, &len);
	cmd->rsp.format = SRP_FORMAT;
	cmd->rsp.len = len;

	return 0;
}

static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd)
{
	struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
						 se_cmd);
	struct scsi_info *vscsi = cmd->adapter;
	struct ibmvscsis_cmd *cmd_itr;
	struct iu_entry *iue = iue = cmd->iue;
	struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
	u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
	uint len;

	pr_debug("queue_tm_rsp %p, status %d\n",
		 se_cmd, (int)se_cmd->se_tmr_req->response);

	if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK &&
	    cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) {
		spin_lock_bh(&vscsi->intr_lock);
		list_for_each_entry(cmd_itr, &vscsi->active_q, list) {
			if (tag_to_abort == cmd_itr->se_cmd.tag) {
				cmd_itr->abort_cmd = cmd;
				cmd->flags |= DELAY_SEND;
				break;
			}
		}
		spin_unlock_bh(&vscsi->intr_lock);
	}

	srp_build_response(vscsi, cmd, &len);
	cmd->rsp.format = SRP_FORMAT;
	cmd->rsp.len = len;
}

static void ibmvscsis_aborted_task(struct se_cmd *se_cmd)
{
	pr_debug("ibmvscsis_aborted_task %p task_tag: %llu\n",
		 se_cmd, se_cmd->tag);
}

static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf,
					   struct config_group *group,
					   const char *name)
{
	struct ibmvscsis_tport *tport;

	tport = ibmvscsis_lookup_port(name);
	if (tport) {
		tport->tport_proto_id = SCSI_PROTOCOL_SRP;
		pr_debug("make_tport(%s), pointer:%p, tport_id:%x\n",
			 name, tport, tport->tport_proto_id);
		return &tport->tport_wwn;
	}

	return ERR_PTR(-EINVAL);
}

static void ibmvscsis_drop_tport(struct se_wwn *wwn)
{
	struct ibmvscsis_tport *tport = container_of(wwn,
						     struct ibmvscsis_tport,
						     tport_wwn);

	pr_debug("drop_tport(%s)\n",
		 config_item_name(&tport->tport_wwn.wwn_group.cg_item));
}

static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn,
						  struct config_group *group,
						  const char *name)
{
	struct ibmvscsis_tport *tport =
		container_of(wwn, struct ibmvscsis_tport, tport_wwn);
	u16 tpgt;
	int rc;

	if (strstr(name, "tpgt_") != name)
		return ERR_PTR(-EINVAL);
	rc = kstrtou16(name + 5, 0, &tpgt);
	if (rc)
		return ERR_PTR(rc);
	tport->tport_tpgt = tpgt;

	tport->releasing = false;

	rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg,
			       tport->tport_proto_id);
	if (rc)
		return ERR_PTR(rc);

	return &tport->se_tpg;
}

static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg)
{
	struct ibmvscsis_tport *tport = container_of(se_tpg,
						     struct ibmvscsis_tport,
						     se_tpg);

	tport->releasing = true;
	tport->enabled = false;

	/*
	 * Release the virtual I_T Nexus for this ibmvscsis TPG
	 */
	ibmvscsis_drop_nexus(tport);
	/*
	 * Deregister the se_tpg from TCM..
	 */
	core_tpg_deregister(se_tpg);
}

static ssize_t ibmvscsis_wwn_version_show(struct config_item *item,
					  char *page)
{
	return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION);
}
CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version);

static struct configfs_attribute *ibmvscsis_wwn_attrs[] = {
	&ibmvscsis_wwn_attr_version,
	NULL,
};

static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item,
					 char *page)
{
	struct se_portal_group *se_tpg = to_tpg(item);
	struct ibmvscsis_tport *tport = container_of(se_tpg,
						     struct ibmvscsis_tport,
						     se_tpg);

	return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0);
}

static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item,
					  const char *page, size_t count)
{
	struct se_portal_group *se_tpg = to_tpg(item);
	struct ibmvscsis_tport *tport = container_of(se_tpg,
						     struct ibmvscsis_tport,
						     se_tpg);
	struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
	unsigned long tmp;
	int rc;
	long lrc;

	rc = kstrtoul(page, 0, &tmp);
	if (rc < 0) {
		pr_err("Unable to extract srpt_tpg_store_enable\n");
		return -EINVAL;
	}

	if ((tmp != 0) && (tmp != 1)) {
		pr_err("Illegal value for srpt_tpg_store_enable\n");
		return -EINVAL;
	}

	if (tmp) {
		spin_lock_bh(&vscsi->intr_lock);
		tport->enabled = true;
		lrc = ibmvscsis_enable_change_state(vscsi);
		if (lrc)
			pr_err("enable_change_state failed, rc %ld state %d\n",
			       lrc, vscsi->state);
		spin_unlock_bh(&vscsi->intr_lock);
	} else {
		spin_lock_bh(&vscsi->intr_lock);
		tport->enabled = false;
		/* This simulates the server going down */
		ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
		spin_unlock_bh(&vscsi->intr_lock);
	}

	pr_debug("tpg_enable_store, tmp %ld, state %d\n", tmp, vscsi->state);

	return count;
}
CONFIGFS_ATTR(ibmvscsis_tpg_, enable);

static struct configfs_attribute *ibmvscsis_tpg_attrs[] = {
	&ibmvscsis_tpg_attr_enable,
	NULL,
};

static const struct target_core_fabric_ops ibmvscsis_ops = {
	.module				= THIS_MODULE,
	.name				= "ibmvscsis",
	.max_data_sg_nents		= MAX_TXU / PAGE_SIZE,
	.get_fabric_name		= ibmvscsis_get_fabric_name,
	.tpg_get_wwn			= ibmvscsis_get_fabric_wwn,
	.tpg_get_tag			= ibmvscsis_get_tag,
	.tpg_get_default_depth		= ibmvscsis_get_default_depth,
	.tpg_check_demo_mode		= ibmvscsis_check_true,
	.tpg_check_demo_mode_cache	= ibmvscsis_check_true,
	.tpg_check_demo_mode_write_protect = ibmvscsis_check_false,
	.tpg_check_prod_mode_write_protect = ibmvscsis_check_false,
	.tpg_get_inst_index		= ibmvscsis_tpg_get_inst_index,
	.check_stop_free		= ibmvscsis_check_stop_free,
	.release_cmd			= ibmvscsis_release_cmd,
	.sess_get_index			= ibmvscsis_sess_get_index,
	.write_pending			= ibmvscsis_write_pending,
	.write_pending_status		= ibmvscsis_write_pending_status,
	.set_default_node_attributes	= ibmvscsis_set_default_node_attrs,
	.get_cmd_state			= ibmvscsis_get_cmd_state,
	.queue_data_in			= ibmvscsis_queue_data_in,
	.queue_status			= ibmvscsis_queue_status,
	.queue_tm_rsp			= ibmvscsis_queue_tm_rsp,
	.aborted_task			= ibmvscsis_aborted_task,
	/*
	 * Setup function pointers for logic in target_core_fabric_configfs.c
	 */
	.fabric_make_wwn		= ibmvscsis_make_tport,
	.fabric_drop_wwn		= ibmvscsis_drop_tport,
	.fabric_make_tpg		= ibmvscsis_make_tpg,
	.fabric_drop_tpg		= ibmvscsis_drop_tpg,

	.tfc_wwn_attrs			= ibmvscsis_wwn_attrs,
	.tfc_tpg_base_attrs		= ibmvscsis_tpg_attrs,
};

static void ibmvscsis_dev_release(struct device *dev) {};

static struct device_attribute dev_attr_system_id =
	__ATTR(system_id, S_IRUGO, system_id_show, NULL);

static struct device_attribute dev_attr_partition_number =
	__ATTR(partition_number, S_IRUGO, partition_number_show, NULL);

static struct device_attribute dev_attr_unit_address =
	__ATTR(unit_address, S_IRUGO, unit_address_show, NULL);

static struct attribute *ibmvscsis_dev_attrs[] = {
	&dev_attr_system_id.attr,
	&dev_attr_partition_number.attr,
	&dev_attr_unit_address.attr,
};
ATTRIBUTE_GROUPS(ibmvscsis_dev);

static struct class ibmvscsis_class = {
	.name		= "ibmvscsis",
	.dev_release	= ibmvscsis_dev_release,
	.dev_groups	= ibmvscsis_dev_groups,
};

static const struct vio_device_id ibmvscsis_device_table[] = {
	{ "v-scsi-host", "IBM,v-scsi-host" },
	{ "", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table);

static struct vio_driver ibmvscsis_driver = {
	.name = "ibmvscsis",
	.id_table = ibmvscsis_device_table,
	.probe = ibmvscsis_probe,
	.remove = ibmvscsis_remove,
};

/*
 * ibmvscsis_init() - Kernel Module initialization
 *
 * Note: vio_register_driver() registers callback functions, and at least one
 * of those callback functions calls TCM - Linux IO Target Subsystem, thus
 * the SCSI Target template must be registered before vio_register_driver()
 * is called.
 */
static int __init ibmvscsis_init(void)
{
	int rc = 0;

	rc = ibmvscsis_get_system_info();
	if (rc) {
		pr_err("rc %d from get_system_info\n", rc);
		goto out;
	}

	rc = class_register(&ibmvscsis_class);
	if (rc) {
		pr_err("failed class register\n");
		goto out;
	}

	rc = target_register_template(&ibmvscsis_ops);
	if (rc) {
		pr_err("rc %d from target_register_template\n", rc);
		goto unregister_class;
	}

	rc = vio_register_driver(&ibmvscsis_driver);
	if (rc) {
		pr_err("rc %d from vio_register_driver\n", rc);
		goto unregister_target;
	}

	return 0;

unregister_target:
	target_unregister_template(&ibmvscsis_ops);
unregister_class:
	class_unregister(&ibmvscsis_class);
out:
	return rc;
}

static void __exit ibmvscsis_exit(void)
{
	pr_info("Unregister IBM virtual SCSI host driver\n");
	vio_unregister_driver(&ibmvscsis_driver);
	target_unregister_template(&ibmvscsis_ops);
	class_unregister(&ibmvscsis_class);
}

MODULE_DESCRIPTION("IBMVSCSIS fabric driver");
MODULE_AUTHOR("Bryant G. Ly and Michael Cyr");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVSCSIS_VERSION);
module_init(ibmvscsis_init);
module_exit(ibmvscsis_exit);