summaryrefslogtreecommitdiffstats
path: root/drivers/block/nvme-scsi.c
blob: 44f2514fb7755d0bdf9f4524ebbe5364a84af5a3 (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
/*
 * NVM Express device driver
 * Copyright (c) 2011-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 */

/*
 * Refer to the SCSI-NVMe Translation spec for details on how
 * each command is translated.
 */

#include <linux/nvme.h>
#include <linux/bio.h>
#include <linux/bitops.h>
#include <linux/blkdev.h>
#include <linux/compat.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/idr.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kdev_t.h>
#include <linux/kthread.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/poison.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <scsi/sg.h>
#include <scsi/scsi.h>


static int sg_version_num = 30534;	/* 2 digits for each component */

#define SNTI_TRANSLATION_SUCCESS			0
#define SNTI_INTERNAL_ERROR				1

/* VPD Page Codes */
#define VPD_SUPPORTED_PAGES				0x00
#define VPD_SERIAL_NUMBER				0x80
#define VPD_DEVICE_IDENTIFIERS				0x83
#define VPD_EXTENDED_INQUIRY				0x86
#define VPD_BLOCK_LIMITS				0xB0
#define VPD_BLOCK_DEV_CHARACTERISTICS			0xB1

/* CDB offsets */
#define REPORT_LUNS_CDB_ALLOC_LENGTH_OFFSET		6
#define REPORT_LUNS_SR_OFFSET				2
#define READ_CAP_16_CDB_ALLOC_LENGTH_OFFSET		10
#define REQUEST_SENSE_CDB_ALLOC_LENGTH_OFFSET		4
#define REQUEST_SENSE_DESC_OFFSET			1
#define REQUEST_SENSE_DESC_MASK				0x01
#define DESCRIPTOR_FORMAT_SENSE_DATA_TYPE		1
#define INQUIRY_EVPD_BYTE_OFFSET			1
#define INQUIRY_PAGE_CODE_BYTE_OFFSET			2
#define INQUIRY_EVPD_BIT_MASK				1
#define INQUIRY_CDB_ALLOCATION_LENGTH_OFFSET		3
#define START_STOP_UNIT_CDB_IMMED_OFFSET		1
#define START_STOP_UNIT_CDB_IMMED_MASK			0x1
#define START_STOP_UNIT_CDB_POWER_COND_MOD_OFFSET	3
#define START_STOP_UNIT_CDB_POWER_COND_MOD_MASK		0xF
#define START_STOP_UNIT_CDB_POWER_COND_OFFSET		4
#define START_STOP_UNIT_CDB_POWER_COND_MASK		0xF0
#define START_STOP_UNIT_CDB_NO_FLUSH_OFFSET		4
#define START_STOP_UNIT_CDB_NO_FLUSH_MASK		0x4
#define START_STOP_UNIT_CDB_START_OFFSET		4
#define START_STOP_UNIT_CDB_START_MASK			0x1
#define WRITE_BUFFER_CDB_MODE_OFFSET			1
#define WRITE_BUFFER_CDB_MODE_MASK			0x1F
#define WRITE_BUFFER_CDB_BUFFER_ID_OFFSET		2
#define WRITE_BUFFER_CDB_BUFFER_OFFSET_OFFSET		3
#define WRITE_BUFFER_CDB_PARM_LIST_LENGTH_OFFSET	6
#define FORMAT_UNIT_CDB_FORMAT_PROT_INFO_OFFSET		1
#define FORMAT_UNIT_CDB_FORMAT_PROT_INFO_MASK		0xC0
#define FORMAT_UNIT_CDB_FORMAT_PROT_INFO_SHIFT		6
#define FORMAT_UNIT_CDB_LONG_LIST_OFFSET		1
#define FORMAT_UNIT_CDB_LONG_LIST_MASK			0x20
#define FORMAT_UNIT_CDB_FORMAT_DATA_OFFSET		1
#define FORMAT_UNIT_CDB_FORMAT_DATA_MASK		0x10
#define FORMAT_UNIT_SHORT_PARM_LIST_LEN			4
#define FORMAT_UNIT_LONG_PARM_LIST_LEN			8
#define FORMAT_UNIT_PROT_INT_OFFSET			3
#define FORMAT_UNIT_PROT_FIELD_USAGE_OFFSET		0
#define FORMAT_UNIT_PROT_FIELD_USAGE_MASK		0x07
#define UNMAP_CDB_PARAM_LIST_LENGTH_OFFSET		7

/* Misc. defines */
#define NIBBLE_SHIFT					4
#define FIXED_SENSE_DATA				0x70
#define DESC_FORMAT_SENSE_DATA				0x72
#define FIXED_SENSE_DATA_ADD_LENGTH			10
#define LUN_ENTRY_SIZE					8
#define LUN_DATA_HEADER_SIZE				8
#define ALL_LUNS_RETURNED				0x02
#define ALL_WELL_KNOWN_LUNS_RETURNED			0x01
#define RESTRICTED_LUNS_RETURNED			0x00
#define NVME_POWER_STATE_START_VALID			0x00
#define NVME_POWER_STATE_ACTIVE				0x01
#define NVME_POWER_STATE_IDLE				0x02
#define NVME_POWER_STATE_STANDBY			0x03
#define NVME_POWER_STATE_LU_CONTROL			0x07
#define POWER_STATE_0					0
#define POWER_STATE_1					1
#define POWER_STATE_2					2
#define POWER_STATE_3					3
#define DOWNLOAD_SAVE_ACTIVATE				0x05
#define DOWNLOAD_SAVE_DEFER_ACTIVATE			0x0E
#define ACTIVATE_DEFERRED_MICROCODE			0x0F
#define FORMAT_UNIT_IMMED_MASK				0x2
#define FORMAT_UNIT_IMMED_OFFSET			1
#define KELVIN_TEMP_FACTOR				273
#define FIXED_FMT_SENSE_DATA_SIZE			18
#define DESC_FMT_SENSE_DATA_SIZE			8

/* SCSI/NVMe defines and bit masks */
#define INQ_STANDARD_INQUIRY_PAGE			0x00
#define INQ_SUPPORTED_VPD_PAGES_PAGE			0x00
#define INQ_UNIT_SERIAL_NUMBER_PAGE			0x80
#define INQ_DEVICE_IDENTIFICATION_PAGE			0x83
#define INQ_EXTENDED_INQUIRY_DATA_PAGE			0x86
#define INQ_BDEV_LIMITS_PAGE				0xB0
#define INQ_BDEV_CHARACTERISTICS_PAGE			0xB1
#define INQ_SERIAL_NUMBER_LENGTH			0x14
#define INQ_NUM_SUPPORTED_VPD_PAGES			6
#define VERSION_SPC_4					0x06
#define ACA_UNSUPPORTED					0
#define STANDARD_INQUIRY_LENGTH				36
#define ADDITIONAL_STD_INQ_LENGTH			31
#define EXTENDED_INQUIRY_DATA_PAGE_LENGTH		0x3C
#define RESERVED_FIELD					0

/* SCSI READ/WRITE Defines */
#define IO_CDB_WP_MASK					0xE0
#define IO_CDB_WP_SHIFT					5
#define IO_CDB_FUA_MASK					0x8
#define IO_6_CDB_LBA_OFFSET				0
#define IO_6_CDB_LBA_MASK				0x001FFFFF
#define IO_6_CDB_TX_LEN_OFFSET				4
#define IO_6_DEFAULT_TX_LEN				256
#define IO_10_CDB_LBA_OFFSET				2
#define IO_10_CDB_TX_LEN_OFFSET				7
#define IO_10_CDB_WP_OFFSET				1
#define IO_10_CDB_FUA_OFFSET				1
#define IO_12_CDB_LBA_OFFSET				2
#define IO_12_CDB_TX_LEN_OFFSET				6
#define IO_12_CDB_WP_OFFSET				1
#define IO_12_CDB_FUA_OFFSET				1
#define IO_16_CDB_FUA_OFFSET				1
#define IO_16_CDB_WP_OFFSET				1
#define IO_16_CDB_LBA_OFFSET				2
#define IO_16_CDB_TX_LEN_OFFSET				10

/* Mode Sense/Select defines */
#define MODE_PAGE_INFO_EXCEP				0x1C
#define MODE_PAGE_CACHING				0x08
#define MODE_PAGE_CONTROL				0x0A
#define MODE_PAGE_POWER_CONDITION			0x1A
#define MODE_PAGE_RETURN_ALL				0x3F
#define MODE_PAGE_BLK_DES_LEN				0x08
#define MODE_PAGE_LLBAA_BLK_DES_LEN			0x10
#define MODE_PAGE_CACHING_LEN				0x14
#define MODE_PAGE_CONTROL_LEN				0x0C
#define MODE_PAGE_POW_CND_LEN				0x28
#define MODE_PAGE_INF_EXC_LEN				0x0C
#define MODE_PAGE_ALL_LEN				0x54
#define MODE_SENSE6_MPH_SIZE				4
#define MODE_SENSE6_ALLOC_LEN_OFFSET			4
#define MODE_SENSE_PAGE_CONTROL_OFFSET			2
#define MODE_SENSE_PAGE_CONTROL_MASK			0xC0
#define MODE_SENSE_PAGE_CODE_OFFSET			2
#define MODE_SENSE_PAGE_CODE_MASK			0x3F
#define MODE_SENSE_LLBAA_OFFSET				1
#define MODE_SENSE_LLBAA_MASK				0x10
#define MODE_SENSE_LLBAA_SHIFT				4
#define MODE_SENSE_DBD_OFFSET				1
#define MODE_SENSE_DBD_MASK				8
#define MODE_SENSE_DBD_SHIFT				3
#define MODE_SENSE10_MPH_SIZE				8
#define MODE_SENSE10_ALLOC_LEN_OFFSET			7
#define MODE_SELECT_CDB_PAGE_FORMAT_OFFSET		1
#define MODE_SELECT_CDB_SAVE_PAGES_OFFSET		1
#define MODE_SELECT_6_CDB_PARAM_LIST_LENGTH_OFFSET	4
#define MODE_SELECT_10_CDB_PARAM_LIST_LENGTH_OFFSET	7
#define MODE_SELECT_CDB_PAGE_FORMAT_MASK		0x10
#define MODE_SELECT_CDB_SAVE_PAGES_MASK			0x1
#define MODE_SELECT_6_BD_OFFSET				3
#define MODE_SELECT_10_BD_OFFSET			6
#define MODE_SELECT_10_LLBAA_OFFSET			4
#define MODE_SELECT_10_LLBAA_MASK			1
#define MODE_SELECT_6_MPH_SIZE				4
#define MODE_SELECT_10_MPH_SIZE				8
#define CACHING_MODE_PAGE_WCE_MASK			0x04
#define MODE_SENSE_BLK_DESC_ENABLED			0
#define MODE_SENSE_BLK_DESC_COUNT			1
#define MODE_SELECT_PAGE_CODE_MASK			0x3F
#define SHORT_DESC_BLOCK				8
#define LONG_DESC_BLOCK					16
#define MODE_PAGE_POW_CND_LEN_FIELD			0x26
#define MODE_PAGE_INF_EXC_LEN_FIELD			0x0A
#define MODE_PAGE_CACHING_LEN_FIELD			0x12
#define MODE_PAGE_CONTROL_LEN_FIELD			0x0A
#define MODE_SENSE_PC_CURRENT_VALUES			0

/* Log Sense defines */
#define LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE		0x00
#define LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH		0x07
#define LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE		0x2F
#define LOG_PAGE_TEMPERATURE_PAGE			0x0D
#define LOG_SENSE_CDB_SP_OFFSET				1
#define LOG_SENSE_CDB_SP_NOT_ENABLED			0
#define LOG_SENSE_CDB_PC_OFFSET				2
#define LOG_SENSE_CDB_PC_MASK				0xC0
#define LOG_SENSE_CDB_PC_SHIFT				6
#define LOG_SENSE_CDB_PC_CUMULATIVE_VALUES		1
#define LOG_SENSE_CDB_PAGE_CODE_MASK			0x3F
#define LOG_SENSE_CDB_ALLOC_LENGTH_OFFSET		7
#define REMAINING_INFO_EXCP_PAGE_LENGTH			0x8
#define LOG_INFO_EXCP_PAGE_LENGTH			0xC
#define REMAINING_TEMP_PAGE_LENGTH			0xC
#define LOG_TEMP_PAGE_LENGTH				0x10
#define LOG_TEMP_UNKNOWN				0xFF
#define SUPPORTED_LOG_PAGES_PAGE_LENGTH			0x3

/* Read Capacity defines */
#define READ_CAP_10_RESP_SIZE				8
#define READ_CAP_16_RESP_SIZE				32

/* NVMe Namespace and Command Defines */
#define BYTES_TO_DWORDS					4
#define NVME_MAX_FIRMWARE_SLOT				7

/* Report LUNs defines */
#define REPORT_LUNS_FIRST_LUN_OFFSET			8

/* SCSI ADDITIONAL SENSE Codes */

#define SCSI_ASC_NO_SENSE				0x00
#define SCSI_ASC_PERIPHERAL_DEV_WRITE_FAULT		0x03
#define SCSI_ASC_LUN_NOT_READY				0x04
#define SCSI_ASC_WARNING				0x0B
#define SCSI_ASC_LOG_BLOCK_GUARD_CHECK_FAILED		0x10
#define SCSI_ASC_LOG_BLOCK_APPTAG_CHECK_FAILED		0x10
#define SCSI_ASC_LOG_BLOCK_REFTAG_CHECK_FAILED		0x10
#define SCSI_ASC_UNRECOVERED_READ_ERROR			0x11
#define SCSI_ASC_MISCOMPARE_DURING_VERIFY		0x1D
#define SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID		0x20
#define SCSI_ASC_ILLEGAL_COMMAND			0x20
#define SCSI_ASC_ILLEGAL_BLOCK				0x21
#define SCSI_ASC_INVALID_CDB				0x24
#define SCSI_ASC_INVALID_LUN				0x25
#define SCSI_ASC_INVALID_PARAMETER			0x26
#define SCSI_ASC_FORMAT_COMMAND_FAILED			0x31
#define SCSI_ASC_INTERNAL_TARGET_FAILURE		0x44

/* SCSI ADDITIONAL SENSE Code Qualifiers */

#define SCSI_ASCQ_CAUSE_NOT_REPORTABLE			0x00
#define SCSI_ASCQ_FORMAT_COMMAND_FAILED			0x01
#define SCSI_ASCQ_LOG_BLOCK_GUARD_CHECK_FAILED		0x01
#define SCSI_ASCQ_LOG_BLOCK_APPTAG_CHECK_FAILED		0x02
#define SCSI_ASCQ_LOG_BLOCK_REFTAG_CHECK_FAILED		0x03
#define SCSI_ASCQ_FORMAT_IN_PROGRESS			0x04
#define SCSI_ASCQ_POWER_LOSS_EXPECTED			0x08
#define SCSI_ASCQ_INVALID_LUN_ID			0x09

/**
 * DEVICE_SPECIFIC_PARAMETER in mode parameter header (see sbc2r16) to
 * enable DPOFUA support type 0x10 value.
 */
#define DEVICE_SPECIFIC_PARAMETER			0
#define VPD_ID_DESCRIPTOR_LENGTH sizeof(VPD_IDENTIFICATION_DESCRIPTOR)

/* MACROs to extract information from CDBs */

#define GET_OPCODE(cdb)		cdb[0]

#define GET_U8_FROM_CDB(cdb, index) (cdb[index] << 0)

#define GET_U16_FROM_CDB(cdb, index) ((cdb[index] << 8) | (cdb[index + 1] << 0))

#define GET_U24_FROM_CDB(cdb, index) ((cdb[index] << 16) | \
(cdb[index + 1] <<  8) | \
(cdb[index + 2] <<  0))

#define GET_U32_FROM_CDB(cdb, index) ((cdb[index] << 24) | \
(cdb[index + 1] << 16) | \
(cdb[index + 2] <<  8) | \
(cdb[index + 3] <<  0))

#define GET_U64_FROM_CDB(cdb, index) ((((u64)cdb[index]) << 56) | \
(((u64)cdb[index + 1]) << 48) | \
(((u64)cdb[index + 2]) << 40) | \
(((u64)cdb[index + 3]) << 32) | \
(((u64)cdb[index + 4]) << 24) | \
(((u64)cdb[index + 5]) << 16) | \
(((u64)cdb[index + 6]) <<  8) | \
(((u64)cdb[index + 7]) <<  0))

/* Inquiry Helper Macros */
#define GET_INQ_EVPD_BIT(cdb) \
((GET_U8_FROM_CDB(cdb, INQUIRY_EVPD_BYTE_OFFSET) &		\
INQUIRY_EVPD_BIT_MASK) ? 1 : 0)

#define GET_INQ_PAGE_CODE(cdb)					\
(GET_U8_FROM_CDB(cdb, INQUIRY_PAGE_CODE_BYTE_OFFSET))

#define GET_INQ_ALLOC_LENGTH(cdb)				\
(GET_U16_FROM_CDB(cdb, INQUIRY_CDB_ALLOCATION_LENGTH_OFFSET))

/* Report LUNs Helper Macros */
#define GET_REPORT_LUNS_ALLOC_LENGTH(cdb)			\
(GET_U32_FROM_CDB(cdb, REPORT_LUNS_CDB_ALLOC_LENGTH_OFFSET))

/* Read Capacity Helper Macros */
#define GET_READ_CAP_16_ALLOC_LENGTH(cdb)			\
(GET_U32_FROM_CDB(cdb, READ_CAP_16_CDB_ALLOC_LENGTH_OFFSET))

#define IS_READ_CAP_16(cdb)					\
((cdb[0] == SERVICE_ACTION_IN_16 && cdb[1] == SAI_READ_CAPACITY_16) ? 1 : 0)

/* Request Sense Helper Macros */
#define GET_REQUEST_SENSE_ALLOC_LENGTH(cdb)			\
(GET_U8_FROM_CDB(cdb, REQUEST_SENSE_CDB_ALLOC_LENGTH_OFFSET))

/* Mode Sense Helper Macros */
#define GET_MODE_SENSE_DBD(cdb)					\
((GET_U8_FROM_CDB(cdb, MODE_SENSE_DBD_OFFSET) & MODE_SENSE_DBD_MASK) >>	\
MODE_SENSE_DBD_SHIFT)

#define GET_MODE_SENSE_LLBAA(cdb)				\
((GET_U8_FROM_CDB(cdb, MODE_SENSE_LLBAA_OFFSET) &		\
MODE_SENSE_LLBAA_MASK) >> MODE_SENSE_LLBAA_SHIFT)

#define GET_MODE_SENSE_MPH_SIZE(cdb10)				\
(cdb10 ? MODE_SENSE10_MPH_SIZE : MODE_SENSE6_MPH_SIZE)


/* Struct to gather data that needs to be extracted from a SCSI CDB.
   Not conforming to any particular CDB variant, but compatible with all. */

struct nvme_trans_io_cdb {
	u8 fua;
	u8 prot_info;
	u64 lba;
	u32 xfer_len;
};


/* Internal Helper Functions */


/* Copy data to userspace memory */

static int nvme_trans_copy_to_user(struct sg_io_hdr *hdr, void *from,
								unsigned long n)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	unsigned long not_copied;
	int i;
	void *index = from;
	size_t remaining = n;
	size_t xfer_len;

	if (hdr->iovec_count > 0) {
		struct sg_iovec sgl;

		for (i = 0; i < hdr->iovec_count; i++) {
			not_copied = copy_from_user(&sgl, hdr->dxferp +
						i * sizeof(struct sg_iovec),
						sizeof(struct sg_iovec));
			if (not_copied)
				return -EFAULT;
			xfer_len = min(remaining, sgl.iov_len);
			not_copied = copy_to_user(sgl.iov_base, index,
								xfer_len);
			if (not_copied) {
				res = -EFAULT;
				break;
			}
			index += xfer_len;
			remaining -= xfer_len;
			if (remaining == 0)
				break;
		}
		return res;
	}
	not_copied = copy_to_user(hdr->dxferp, from, n);
	if (not_copied)
		res = -EFAULT;
	return res;
}

/* Copy data from userspace memory */

static int nvme_trans_copy_from_user(struct sg_io_hdr *hdr, void *to,
								unsigned long n)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	unsigned long not_copied;
	int i;
	void *index = to;
	size_t remaining = n;
	size_t xfer_len;

	if (hdr->iovec_count > 0) {
		struct sg_iovec sgl;

		for (i = 0; i < hdr->iovec_count; i++) {
			not_copied = copy_from_user(&sgl, hdr->dxferp +
						i * sizeof(struct sg_iovec),
						sizeof(struct sg_iovec));
			if (not_copied)
				return -EFAULT;
			xfer_len = min(remaining, sgl.iov_len);
			not_copied = copy_from_user(index, sgl.iov_base,
								xfer_len);
			if (not_copied) {
				res = -EFAULT;
				break;
			}
			index += xfer_len;
			remaining -= xfer_len;
			if (remaining == 0)
				break;
		}
		return res;
	}

	not_copied = copy_from_user(to, hdr->dxferp, n);
	if (not_copied)
		res = -EFAULT;
	return res;
}

/* Status/Sense Buffer Writeback */

static int nvme_trans_completion(struct sg_io_hdr *hdr, u8 status, u8 sense_key,
				 u8 asc, u8 ascq)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u8 xfer_len;
	u8 resp[DESC_FMT_SENSE_DATA_SIZE];

	if (scsi_status_is_good(status)) {
		hdr->status = SAM_STAT_GOOD;
		hdr->masked_status = GOOD;
		hdr->host_status = DID_OK;
		hdr->driver_status = DRIVER_OK;
		hdr->sb_len_wr = 0;
	} else {
		hdr->status = status;
		hdr->masked_status = status >> 1;
		hdr->host_status = DID_OK;
		hdr->driver_status = DRIVER_OK;

		memset(resp, 0, DESC_FMT_SENSE_DATA_SIZE);
		resp[0] = DESC_FORMAT_SENSE_DATA;
		resp[1] = sense_key;
		resp[2] = asc;
		resp[3] = ascq;

		xfer_len = min_t(u8, hdr->mx_sb_len, DESC_FMT_SENSE_DATA_SIZE);
		hdr->sb_len_wr = xfer_len;
		if (copy_to_user(hdr->sbp, resp, xfer_len) > 0)
			res = -EFAULT;
	}

	return res;
}

static int nvme_trans_status_code(struct sg_io_hdr *hdr, int nvme_sc)
{
	u8 status, sense_key, asc, ascq;
	int res = SNTI_TRANSLATION_SUCCESS;

	/* For non-nvme (Linux) errors, simply return the error code */
	if (nvme_sc < 0)
		return nvme_sc;

	/* Mask DNR, More, and reserved fields */
	nvme_sc &= 0x7FF;

	switch (nvme_sc) {
	/* Generic Command Status */
	case NVME_SC_SUCCESS:
		status = SAM_STAT_GOOD;
		sense_key = NO_SENSE;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_INVALID_OPCODE:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_ILLEGAL_COMMAND;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_INVALID_FIELD:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_INVALID_CDB;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_DATA_XFER_ERROR:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MEDIUM_ERROR;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_POWER_LOSS:
		status = SAM_STAT_TASK_ABORTED;
		sense_key = ABORTED_COMMAND;
		asc = SCSI_ASC_WARNING;
		ascq = SCSI_ASCQ_POWER_LOSS_EXPECTED;
		break;
	case NVME_SC_INTERNAL:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = HARDWARE_ERROR;
		asc = SCSI_ASC_INTERNAL_TARGET_FAILURE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_ABORT_REQ:
		status = SAM_STAT_TASK_ABORTED;
		sense_key = ABORTED_COMMAND;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_ABORT_QUEUE:
		status = SAM_STAT_TASK_ABORTED;
		sense_key = ABORTED_COMMAND;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_FUSED_FAIL:
		status = SAM_STAT_TASK_ABORTED;
		sense_key = ABORTED_COMMAND;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_FUSED_MISSING:
		status = SAM_STAT_TASK_ABORTED;
		sense_key = ABORTED_COMMAND;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_INVALID_NS:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID;
		ascq = SCSI_ASCQ_INVALID_LUN_ID;
		break;
	case NVME_SC_LBA_RANGE:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_ILLEGAL_BLOCK;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_CAP_EXCEEDED:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MEDIUM_ERROR;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_NS_NOT_READY:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = NOT_READY;
		asc = SCSI_ASC_LUN_NOT_READY;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;

	/* Command Specific Status */
	case NVME_SC_INVALID_FORMAT:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_FORMAT_COMMAND_FAILED;
		ascq = SCSI_ASCQ_FORMAT_COMMAND_FAILED;
		break;
	case NVME_SC_BAD_ATTRIBUTES:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_INVALID_CDB;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;

	/* Media Errors */
	case NVME_SC_WRITE_FAULT:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MEDIUM_ERROR;
		asc = SCSI_ASC_PERIPHERAL_DEV_WRITE_FAULT;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_READ_ERROR:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MEDIUM_ERROR;
		asc = SCSI_ASC_UNRECOVERED_READ_ERROR;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_GUARD_CHECK:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MEDIUM_ERROR;
		asc = SCSI_ASC_LOG_BLOCK_GUARD_CHECK_FAILED;
		ascq = SCSI_ASCQ_LOG_BLOCK_GUARD_CHECK_FAILED;
		break;
	case NVME_SC_APPTAG_CHECK:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MEDIUM_ERROR;
		asc = SCSI_ASC_LOG_BLOCK_APPTAG_CHECK_FAILED;
		ascq = SCSI_ASCQ_LOG_BLOCK_APPTAG_CHECK_FAILED;
		break;
	case NVME_SC_REFTAG_CHECK:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MEDIUM_ERROR;
		asc = SCSI_ASC_LOG_BLOCK_REFTAG_CHECK_FAILED;
		ascq = SCSI_ASCQ_LOG_BLOCK_REFTAG_CHECK_FAILED;
		break;
	case NVME_SC_COMPARE_FAILED:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = MISCOMPARE;
		asc = SCSI_ASC_MISCOMPARE_DURING_VERIFY;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	case NVME_SC_ACCESS_DENIED:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID;
		ascq = SCSI_ASCQ_INVALID_LUN_ID;
		break;

	/* Unspecified/Default */
	case NVME_SC_CMDID_CONFLICT:
	case NVME_SC_CMD_SEQ_ERROR:
	case NVME_SC_CQ_INVALID:
	case NVME_SC_QID_INVALID:
	case NVME_SC_QUEUE_SIZE:
	case NVME_SC_ABORT_LIMIT:
	case NVME_SC_ABORT_MISSING:
	case NVME_SC_ASYNC_LIMIT:
	case NVME_SC_FIRMWARE_SLOT:
	case NVME_SC_FIRMWARE_IMAGE:
	case NVME_SC_INVALID_VECTOR:
	case NVME_SC_INVALID_LOG_PAGE:
	default:
		status = SAM_STAT_CHECK_CONDITION;
		sense_key = ILLEGAL_REQUEST;
		asc = SCSI_ASC_NO_SENSE;
		ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		break;
	}

	res = nvme_trans_completion(hdr, status, sense_key, asc, ascq);

	return res;
}

/* INQUIRY Helper Functions */

static int nvme_trans_standard_inquiry_page(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *inq_response,
					int alloc_len)
{
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ns *id_ns;
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	int xfer_len;
	u8 resp_data_format = 0x02;
	u8 protect;
	u8 cmdque = 0x01 << 1;
	u8 fw_offset = sizeof(dev->firmware_rev);

	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
				&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out_dma;
	}

	/* nvme ns identify - use DPS value for PROTECT field */
	nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
	res = nvme_trans_status_code(hdr, nvme_sc);
	/*
	 * If nvme_sc was -ve, res will be -ve here.
	 * If nvme_sc was +ve, the status would bace been translated, and res
	 *  can only be 0 or -ve.
	 *    - If 0 && nvme_sc > 0, then go into next if where res gets nvme_sc
	 *    - If -ve, return because its a Linux error.
	 */
	if (res)
		goto out_free;
	if (nvme_sc) {
		res = nvme_sc;
		goto out_free;
	}
	id_ns = mem;
	(id_ns->dps) ? (protect = 0x01) : (protect = 0);

	memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
	inq_response[2] = VERSION_SPC_4;
	inq_response[3] = resp_data_format;	/*normaca=0 | hisup=0 */
	inq_response[4] = ADDITIONAL_STD_INQ_LENGTH;
	inq_response[5] = protect;	/* sccs=0 | acc=0 | tpgs=0 | pc3=0 */
	inq_response[7] = cmdque;	/* wbus16=0 | sync=0 | vs=0 */
	strncpy(&inq_response[8], "NVMe    ", 8);
	strncpy(&inq_response[16], dev->model, 16);

	while (dev->firmware_rev[fw_offset - 1] == ' ' && fw_offset > 4)
		fw_offset--;
	fw_offset -= 4;
	strncpy(&inq_response[32], dev->firmware_rev + fw_offset, 4);

	xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);

 out_free:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
			  dma_addr);
 out_dma:
	return res;
}

static int nvme_trans_supported_vpd_pages(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *inq_response,
					int alloc_len)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int xfer_len;

	memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
	inq_response[1] = INQ_SUPPORTED_VPD_PAGES_PAGE;   /* Page Code */
	inq_response[3] = INQ_NUM_SUPPORTED_VPD_PAGES;    /* Page Length */
	inq_response[4] = INQ_SUPPORTED_VPD_PAGES_PAGE;
	inq_response[5] = INQ_UNIT_SERIAL_NUMBER_PAGE;
	inq_response[6] = INQ_DEVICE_IDENTIFICATION_PAGE;
	inq_response[7] = INQ_EXTENDED_INQUIRY_DATA_PAGE;
	inq_response[8] = INQ_BDEV_CHARACTERISTICS_PAGE;
	inq_response[9] = INQ_BDEV_LIMITS_PAGE;

	xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);

	return res;
}

static int nvme_trans_unit_serial_page(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *inq_response,
					int alloc_len)
{
	struct nvme_dev *dev = ns->dev;
	int res = SNTI_TRANSLATION_SUCCESS;
	int xfer_len;

	memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
	inq_response[1] = INQ_UNIT_SERIAL_NUMBER_PAGE; /* Page Code */
	inq_response[3] = INQ_SERIAL_NUMBER_LENGTH;    /* Page Length */
	strncpy(&inq_response[4], dev->serial, INQ_SERIAL_NUMBER_LENGTH);

	xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);

	return res;
}

static int nvme_trans_device_id_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					u8 *inq_response, int alloc_len)
{
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	int xfer_len;
	__be32 tmp_id = cpu_to_be32(ns->ns_id);

	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
					&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out_dma;
	}

	memset(inq_response, 0, alloc_len);
	inq_response[1] = INQ_DEVICE_IDENTIFICATION_PAGE;    /* Page Code */
	if (readl(&dev->bar->vs) >= NVME_VS(1, 1)) {
		struct nvme_id_ns *id_ns = mem;
		void *eui = id_ns->eui64;
		int len = sizeof(id_ns->eui64);

		nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
		res = nvme_trans_status_code(hdr, nvme_sc);
		if (res)
			goto out_free;
		if (nvme_sc) {
			res = nvme_sc;
			goto out_free;
		}

		if (readl(&dev->bar->vs) >= NVME_VS(1, 2)) {
			if (bitmap_empty(eui, len * 8)) {
				eui = id_ns->nguid;
				len = sizeof(id_ns->nguid);
			}
		}
		if (bitmap_empty(eui, len * 8))
			goto scsi_string;

		inq_response[3] = 4 + len; /* Page Length */
		/* Designation Descriptor start */
		inq_response[4] = 0x01;    /* Proto ID=0h | Code set=1h */
		inq_response[5] = 0x02;    /* PIV=0b | Asso=00b | Designator Type=2h */
		inq_response[6] = 0x00;    /* Rsvd */
		inq_response[7] = len;     /* Designator Length */
		memcpy(&inq_response[8], eui, len);
	} else {
 scsi_string:
		if (alloc_len < 72) {
			res = nvme_trans_completion(hdr,
					SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
			goto out_free;
		}
		inq_response[3] = 0x48;    /* Page Length */
		/* Designation Descriptor start */
		inq_response[4] = 0x03;    /* Proto ID=0h | Code set=3h */
		inq_response[5] = 0x08;    /* PIV=0b | Asso=00b | Designator Type=8h */
		inq_response[6] = 0x00;    /* Rsvd */
		inq_response[7] = 0x44;    /* Designator Length */

		sprintf(&inq_response[8], "%04x", dev->pci_dev->vendor);
		memcpy(&inq_response[12], dev->model, sizeof(dev->model));
		sprintf(&inq_response[52], "%04x", tmp_id);
		memcpy(&inq_response[56], dev->serial, sizeof(dev->serial));
	}
	xfer_len = alloc_len;
	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);

 out_free:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
			  dma_addr);
 out_dma:
	return res;
}

static int nvme_trans_ext_inq_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					int alloc_len)
{
	u8 *inq_response;
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ctrl *id_ctrl;
	struct nvme_id_ns *id_ns;
	int xfer_len;
	u8 microcode = 0x80;
	u8 spt;
	u8 spt_lut[8] = {0, 0, 2, 1, 4, 6, 5, 7};
	u8 grd_chk, app_chk, ref_chk, protect;
	u8 uask_sup = 0x20;
	u8 v_sup;
	u8 luiclr = 0x01;

	inq_response = kmalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH, GFP_KERNEL);
	if (inq_response == NULL) {
		res = -ENOMEM;
		goto out_mem;
	}

	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
							&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out_dma;
	}

	/* nvme ns identify */
	nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_free;
	if (nvme_sc) {
		res = nvme_sc;
		goto out_free;
	}
	id_ns = mem;
	spt = spt_lut[(id_ns->dpc) & 0x07] << 3;
	(id_ns->dps) ? (protect = 0x01) : (protect = 0);
	grd_chk = protect << 2;
	app_chk = protect << 1;
	ref_chk = protect;

	/* nvme controller identify */
	nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_free;
	if (nvme_sc) {
		res = nvme_sc;
		goto out_free;
	}
	id_ctrl = mem;
	v_sup = id_ctrl->vwc;

	memset(inq_response, 0, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
	inq_response[1] = INQ_EXTENDED_INQUIRY_DATA_PAGE;    /* Page Code */
	inq_response[2] = 0x00;    /* Page Length MSB */
	inq_response[3] = 0x3C;    /* Page Length LSB */
	inq_response[4] = microcode | spt | grd_chk | app_chk | ref_chk;
	inq_response[5] = uask_sup;
	inq_response[6] = v_sup;
	inq_response[7] = luiclr;
	inq_response[8] = 0;
	inq_response[9] = 0;

	xfer_len = min(alloc_len, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);

 out_free:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
			  dma_addr);
 out_dma:
	kfree(inq_response);
 out_mem:
	return res;
}

static int nvme_trans_bdev_limits_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					u8 *inq_response, int alloc_len)
{
	__be32 max_sectors = cpu_to_be32(
		nvme_block_nr(ns, queue_max_hw_sectors(ns->queue)));
	__be32 max_discard = cpu_to_be32(ns->queue->limits.max_discard_sectors);
	__be32 discard_desc_count = cpu_to_be32(0x100);

	memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
	inq_response[1] = VPD_BLOCK_LIMITS;
	inq_response[3] = 0x3c; /* Page Length */
	memcpy(&inq_response[8], &max_sectors, sizeof(u32));
	memcpy(&inq_response[20], &max_discard, sizeof(u32));

	if (max_discard)
		memcpy(&inq_response[24], &discard_desc_count, sizeof(u32));

	return nvme_trans_copy_to_user(hdr, inq_response, 0x3c);
}

static int nvme_trans_bdev_char_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					int alloc_len)
{
	u8 *inq_response;
	int res = SNTI_TRANSLATION_SUCCESS;
	int xfer_len;

	inq_response = kzalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH, GFP_KERNEL);
	if (inq_response == NULL) {
		res = -ENOMEM;
		goto out_mem;
	}

	inq_response[1] = INQ_BDEV_CHARACTERISTICS_PAGE;    /* Page Code */
	inq_response[2] = 0x00;    /* Page Length MSB */
	inq_response[3] = 0x3C;    /* Page Length LSB */
	inq_response[4] = 0x00;    /* Medium Rotation Rate MSB */
	inq_response[5] = 0x01;    /* Medium Rotation Rate LSB */
	inq_response[6] = 0x00;    /* Form Factor */

	xfer_len = min(alloc_len, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);

	kfree(inq_response);
 out_mem:
	return res;
}

/* LOG SENSE Helper Functions */

static int nvme_trans_log_supp_pages(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					int alloc_len)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int xfer_len;
	u8 *log_response;

	log_response = kzalloc(LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH, GFP_KERNEL);
	if (log_response == NULL) {
		res = -ENOMEM;
		goto out_mem;
	}

	log_response[0] = LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE;
	/* Subpage=0x00, Page Length MSB=0 */
	log_response[3] = SUPPORTED_LOG_PAGES_PAGE_LENGTH;
	log_response[4] = LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE;
	log_response[5] = LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE;
	log_response[6] = LOG_PAGE_TEMPERATURE_PAGE;

	xfer_len = min(alloc_len, LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH);
	res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);

	kfree(log_response);
 out_mem:
	return res;
}

static int nvme_trans_log_info_exceptions(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, int alloc_len)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int xfer_len;
	u8 *log_response;
	struct nvme_command c;
	struct nvme_dev *dev = ns->dev;
	struct nvme_smart_log *smart_log;
	dma_addr_t dma_addr;
	void *mem;
	u8 temp_c;
	u16 temp_k;

	log_response = kzalloc(LOG_INFO_EXCP_PAGE_LENGTH, GFP_KERNEL);
	if (log_response == NULL) {
		res = -ENOMEM;
		goto out_mem;
	}

	mem = dma_alloc_coherent(&dev->pci_dev->dev,
					sizeof(struct nvme_smart_log),
					&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out_dma;
	}

	/* Get SMART Log Page */
	memset(&c, 0, sizeof(c));
	c.common.opcode = nvme_admin_get_log_page;
	c.common.nsid = cpu_to_le32(0xFFFFFFFF);
	c.common.prp1 = cpu_to_le64(dma_addr);
	c.common.cdw10[0] = cpu_to_le32((((sizeof(struct nvme_smart_log) /
			BYTES_TO_DWORDS) - 1) << 16) | NVME_LOG_SMART);
	res = nvme_submit_admin_cmd(dev, &c, NULL);
	if (res != NVME_SC_SUCCESS) {
		temp_c = LOG_TEMP_UNKNOWN;
	} else {
		smart_log = mem;
		temp_k = (smart_log->temperature[1] << 8) +
				(smart_log->temperature[0]);
		temp_c = temp_k - KELVIN_TEMP_FACTOR;
	}

	log_response[0] = LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE;
	/* Subpage=0x00, Page Length MSB=0 */
	log_response[3] = REMAINING_INFO_EXCP_PAGE_LENGTH;
	/* Informational Exceptions Log Parameter 1 Start */
	/* Parameter Code=0x0000 bytes 4,5 */
	log_response[6] = 0x23; /* DU=0, TSD=1, ETC=0, TMC=0, FMT_AND_LNK=11b */
	log_response[7] = 0x04; /* PARAMETER LENGTH */
	/* Add sense Code and qualifier = 0x00 each */
	/* Use Temperature from NVMe Get Log Page, convert to C from K */
	log_response[10] = temp_c;

	xfer_len = min(alloc_len, LOG_INFO_EXCP_PAGE_LENGTH);
	res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);

	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_smart_log),
			  mem, dma_addr);
 out_dma:
	kfree(log_response);
 out_mem:
	return res;
}

static int nvme_trans_log_temperature(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					int alloc_len)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int xfer_len;
	u8 *log_response;
	struct nvme_command c;
	struct nvme_dev *dev = ns->dev;
	struct nvme_smart_log *smart_log;
	dma_addr_t dma_addr;
	void *mem;
	u32 feature_resp;
	u8 temp_c_cur, temp_c_thresh;
	u16 temp_k;

	log_response = kzalloc(LOG_TEMP_PAGE_LENGTH, GFP_KERNEL);
	if (log_response == NULL) {
		res = -ENOMEM;
		goto out_mem;
	}

	mem = dma_alloc_coherent(&dev->pci_dev->dev,
					sizeof(struct nvme_smart_log),
					&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out_dma;
	}

	/* Get SMART Log Page */
	memset(&c, 0, sizeof(c));
	c.common.opcode = nvme_admin_get_log_page;
	c.common.nsid = cpu_to_le32(0xFFFFFFFF);
	c.common.prp1 = cpu_to_le64(dma_addr);
	c.common.cdw10[0] = cpu_to_le32((((sizeof(struct nvme_smart_log) /
			BYTES_TO_DWORDS) - 1) << 16) | NVME_LOG_SMART);
	res = nvme_submit_admin_cmd(dev, &c, NULL);
	if (res != NVME_SC_SUCCESS) {
		temp_c_cur = LOG_TEMP_UNKNOWN;
	} else {
		smart_log = mem;
		temp_k = (smart_log->temperature[1] << 8) +
				(smart_log->temperature[0]);
		temp_c_cur = temp_k - KELVIN_TEMP_FACTOR;
	}

	/* Get Features for Temp Threshold */
	res = nvme_get_features(dev, NVME_FEAT_TEMP_THRESH, 0, 0,
								&feature_resp);
	if (res != NVME_SC_SUCCESS)
		temp_c_thresh = LOG_TEMP_UNKNOWN;
	else
		temp_c_thresh = (feature_resp & 0xFFFF) - KELVIN_TEMP_FACTOR;

	log_response[0] = LOG_PAGE_TEMPERATURE_PAGE;
	/* Subpage=0x00, Page Length MSB=0 */
	log_response[3] = REMAINING_TEMP_PAGE_LENGTH;
	/* Temperature Log Parameter 1 (Temperature) Start */
	/* Parameter Code = 0x0000 */
	log_response[6] = 0x01;		/* Format and Linking = 01b */
	log_response[7] = 0x02;		/* Parameter Length */
	/* Use Temperature from NVMe Get Log Page, convert to C from K */
	log_response[9] = temp_c_cur;
	/* Temperature Log Parameter 2 (Reference Temperature) Start */
	log_response[11] = 0x01;	/* Parameter Code = 0x0001 */
	log_response[12] = 0x01;	/* Format and Linking = 01b */
	log_response[13] = 0x02;	/* Parameter Length */
	/* Use Temperature Thresh from NVMe Get Log Page, convert to C from K */
	log_response[15] = temp_c_thresh;

	xfer_len = min(alloc_len, LOG_TEMP_PAGE_LENGTH);
	res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);

	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_smart_log),
			  mem, dma_addr);
 out_dma:
	kfree(log_response);
 out_mem:
	return res;
}

/* MODE SENSE Helper Functions */

static int nvme_trans_fill_mode_parm_hdr(u8 *resp, int len, u8 cdb10, u8 llbaa,
					u16 mode_data_length, u16 blk_desc_len)
{
	/* Quick check to make sure I don't stomp on my own memory... */
	if ((cdb10 && len < 8) || (!cdb10 && len < 4))
		return SNTI_INTERNAL_ERROR;

	if (cdb10) {
		resp[0] = (mode_data_length & 0xFF00) >> 8;
		resp[1] = (mode_data_length & 0x00FF);
		/* resp[2] and [3] are zero */
		resp[4] = llbaa;
		resp[5] = RESERVED_FIELD;
		resp[6] = (blk_desc_len & 0xFF00) >> 8;
		resp[7] = (blk_desc_len & 0x00FF);
	} else {
		resp[0] = (mode_data_length & 0x00FF);
		/* resp[1] and [2] are zero */
		resp[3] = (blk_desc_len & 0x00FF);
	}

	return SNTI_TRANSLATION_SUCCESS;
}

static int nvme_trans_fill_blk_desc(struct nvme_ns *ns, struct sg_io_hdr *hdr,
				    u8 *resp, int len, u8 llbaa)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ns *id_ns;
	u8 flbas;
	u32 lba_length;

	if (llbaa == 0 && len < MODE_PAGE_BLK_DES_LEN)
		return SNTI_INTERNAL_ERROR;
	else if (llbaa > 0 && len < MODE_PAGE_LLBAA_BLK_DES_LEN)
		return SNTI_INTERNAL_ERROR;

	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
							&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out;
	}

	/* nvme ns identify */
	nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_dma;
	if (nvme_sc) {
		res = nvme_sc;
		goto out_dma;
	}
	id_ns = mem;
	flbas = (id_ns->flbas) & 0x0F;
	lba_length = (1 << (id_ns->lbaf[flbas].ds));

	if (llbaa == 0) {
		__be32 tmp_cap = cpu_to_be32(le64_to_cpu(id_ns->ncap));
		/* Byte 4 is reserved */
		__be32 tmp_len = cpu_to_be32(lba_length & 0x00FFFFFF);

		memcpy(resp, &tmp_cap, sizeof(u32));
		memcpy(&resp[4], &tmp_len, sizeof(u32));
	} else {
		__be64 tmp_cap = cpu_to_be64(le64_to_cpu(id_ns->ncap));
		__be32 tmp_len = cpu_to_be32(lba_length);

		memcpy(resp, &tmp_cap, sizeof(u64));
		/* Bytes 8, 9, 10, 11 are reserved */
		memcpy(&resp[12], &tmp_len, sizeof(u32));
	}

 out_dma:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
			  dma_addr);
 out:
	return res;
}

static int nvme_trans_fill_control_page(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *resp,
					int len)
{
	if (len < MODE_PAGE_CONTROL_LEN)
		return SNTI_INTERNAL_ERROR;

	resp[0] = MODE_PAGE_CONTROL;
	resp[1] = MODE_PAGE_CONTROL_LEN_FIELD;
	resp[2] = 0x0E;		/* TST=000b, TMF_ONLY=0, DPICZ=1,
				 * D_SENSE=1, GLTSD=1, RLEC=0 */
	resp[3] = 0x12;		/* Q_ALGO_MODIFIER=1h, NUAR=0, QERR=01b */
	/* Byte 4:  VS=0, RAC=0, UA_INT=0, SWP=0 */
	resp[5] = 0x40;		/* ATO=0, TAS=1, ATMPE=0, RWWP=0, AUTOLOAD=0 */
	/* resp[6] and [7] are obsolete, thus zero */
	resp[8] = 0xFF;		/* Busy timeout period = 0xffff */
	resp[9] = 0xFF;
	/* Bytes 10,11: Extended selftest completion time = 0x0000 */

	return SNTI_TRANSLATION_SUCCESS;
}

static int nvme_trans_fill_caching_page(struct nvme_ns *ns,
					struct sg_io_hdr *hdr,
					u8 *resp, int len)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	u32 feature_resp;
	u8 vwc;

	if (len < MODE_PAGE_CACHING_LEN)
		return SNTI_INTERNAL_ERROR;

	nvme_sc = nvme_get_features(dev, NVME_FEAT_VOLATILE_WC, 0, 0,
								&feature_resp);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out;
	if (nvme_sc) {
		res = nvme_sc;
		goto out;
	}
	vwc = feature_resp & 0x00000001;

	resp[0] = MODE_PAGE_CACHING;
	resp[1] = MODE_PAGE_CACHING_LEN_FIELD;
	resp[2] = vwc << 2;

 out:
	return res;
}

static int nvme_trans_fill_pow_cnd_page(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *resp,
					int len)
{
	int res = SNTI_TRANSLATION_SUCCESS;

	if (len < MODE_PAGE_POW_CND_LEN)
		return SNTI_INTERNAL_ERROR;

	resp[0] = MODE_PAGE_POWER_CONDITION;
	resp[1] = MODE_PAGE_POW_CND_LEN_FIELD;
	/* All other bytes are zero */

	return res;
}

static int nvme_trans_fill_inf_exc_page(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *resp,
					int len)
{
	int res = SNTI_TRANSLATION_SUCCESS;

	if (len < MODE_PAGE_INF_EXC_LEN)
		return SNTI_INTERNAL_ERROR;

	resp[0] = MODE_PAGE_INFO_EXCEP;
	resp[1] = MODE_PAGE_INF_EXC_LEN_FIELD;
	resp[2] = 0x88;
	/* All other bytes are zero */

	return res;
}

static int nvme_trans_fill_all_pages(struct nvme_ns *ns, struct sg_io_hdr *hdr,
				     u8 *resp, int len)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u16 mode_pages_offset_1 = 0;
	u16 mode_pages_offset_2, mode_pages_offset_3, mode_pages_offset_4;

	mode_pages_offset_2 = mode_pages_offset_1 + MODE_PAGE_CACHING_LEN;
	mode_pages_offset_3 = mode_pages_offset_2 + MODE_PAGE_CONTROL_LEN;
	mode_pages_offset_4 = mode_pages_offset_3 + MODE_PAGE_POW_CND_LEN;

	res = nvme_trans_fill_caching_page(ns, hdr, &resp[mode_pages_offset_1],
					MODE_PAGE_CACHING_LEN);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out;
	res = nvme_trans_fill_control_page(ns, hdr, &resp[mode_pages_offset_2],
					MODE_PAGE_CONTROL_LEN);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out;
	res = nvme_trans_fill_pow_cnd_page(ns, hdr, &resp[mode_pages_offset_3],
					MODE_PAGE_POW_CND_LEN);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out;
	res = nvme_trans_fill_inf_exc_page(ns, hdr, &resp[mode_pages_offset_4],
					MODE_PAGE_INF_EXC_LEN);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out;

 out:
	return res;
}

static inline int nvme_trans_get_blk_desc_len(u8 dbd, u8 llbaa)
{
	if (dbd == MODE_SENSE_BLK_DESC_ENABLED) {
		/* SPC-4: len = 8 x Num_of_descriptors if llbaa = 0, 16x if 1 */
		return 8 * (llbaa + 1) * MODE_SENSE_BLK_DESC_COUNT;
	} else {
		return 0;
	}
}

static int nvme_trans_mode_page_create(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *cmd,
					u16 alloc_len, u8 cdb10,
					int (*mode_page_fill_func)
					(struct nvme_ns *,
					struct sg_io_hdr *hdr, u8 *, int),
					u16 mode_pages_tot_len)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int xfer_len;
	u8 *response;
	u8 dbd, llbaa;
	u16 resp_size;
	int mph_size;
	u16 mode_pages_offset_1;
	u16 blk_desc_len, blk_desc_offset, mode_data_length;

	dbd = GET_MODE_SENSE_DBD(cmd);
	llbaa = GET_MODE_SENSE_LLBAA(cmd);
	mph_size = GET_MODE_SENSE_MPH_SIZE(cdb10);
	blk_desc_len = nvme_trans_get_blk_desc_len(dbd, llbaa);

	resp_size = mph_size + blk_desc_len + mode_pages_tot_len;
	/* Refer spc4r34 Table 440 for calculation of Mode data Length field */
	mode_data_length = 3 + (3 * cdb10) + blk_desc_len + mode_pages_tot_len;

	blk_desc_offset = mph_size;
	mode_pages_offset_1 = blk_desc_offset + blk_desc_len;

	response = kzalloc(resp_size, GFP_KERNEL);
	if (response == NULL) {
		res = -ENOMEM;
		goto out_mem;
	}

	res = nvme_trans_fill_mode_parm_hdr(&response[0], mph_size, cdb10,
					llbaa, mode_data_length, blk_desc_len);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out_free;
	if (blk_desc_len > 0) {
		res = nvme_trans_fill_blk_desc(ns, hdr,
					       &response[blk_desc_offset],
					       blk_desc_len, llbaa);
		if (res != SNTI_TRANSLATION_SUCCESS)
			goto out_free;
	}
	res = mode_page_fill_func(ns, hdr, &response[mode_pages_offset_1],
					mode_pages_tot_len);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out_free;

	xfer_len = min(alloc_len, resp_size);
	res = nvme_trans_copy_to_user(hdr, response, xfer_len);

 out_free:
	kfree(response);
 out_mem:
	return res;
}

/* Read Capacity Helper Functions */

static void nvme_trans_fill_read_cap(u8 *response, struct nvme_id_ns *id_ns,
								u8 cdb16)
{
	u8 flbas;
	u32 lba_length;
	u64 rlba;
	u8 prot_en;
	u8 p_type_lut[4] = {0, 0, 1, 2};
	__be64 tmp_rlba;
	__be32 tmp_rlba_32;
	__be32 tmp_len;

	flbas = (id_ns->flbas) & 0x0F;
	lba_length = (1 << (id_ns->lbaf[flbas].ds));
	rlba = le64_to_cpup(&id_ns->nsze) - 1;
	(id_ns->dps) ? (prot_en = 0x01) : (prot_en = 0);

	if (!cdb16) {
		if (rlba > 0xFFFFFFFF)
			rlba = 0xFFFFFFFF;
		tmp_rlba_32 = cpu_to_be32(rlba);
		tmp_len = cpu_to_be32(lba_length);
		memcpy(response, &tmp_rlba_32, sizeof(u32));
		memcpy(&response[4], &tmp_len, sizeof(u32));
	} else {
		tmp_rlba = cpu_to_be64(rlba);
		tmp_len = cpu_to_be32(lba_length);
		memcpy(response, &tmp_rlba, sizeof(u64));
		memcpy(&response[8], &tmp_len, sizeof(u32));
		response[12] = (p_type_lut[id_ns->dps & 0x3] << 1) | prot_en;
		/* P_I_Exponent = 0x0 | LBPPBE = 0x0 */
		/* LBPME = 0 | LBPRZ = 0 | LALBA = 0x00 */
		/* Bytes 16-31 - Reserved */
	}
}

/* Start Stop Unit Helper Functions */

static int nvme_trans_power_state(struct nvme_ns *ns, struct sg_io_hdr *hdr,
						u8 pc, u8 pcmod, u8 start)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ctrl *id_ctrl;
	int lowest_pow_st;	/* max npss = lowest power consumption */
	unsigned ps_desired = 0;

	/* NVMe Controller Identify */
	mem = dma_alloc_coherent(&dev->pci_dev->dev,
				sizeof(struct nvme_id_ctrl),
				&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out;
	}
	nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_dma;
	if (nvme_sc) {
		res = nvme_sc;
		goto out_dma;
	}
	id_ctrl = mem;
	lowest_pow_st = max(POWER_STATE_0, (int)(id_ctrl->npss - 1));

	switch (pc) {
	case NVME_POWER_STATE_START_VALID:
		/* Action unspecified if POWER CONDITION MODIFIER != 0 */
		if (pcmod == 0 && start == 0x1)
			ps_desired = POWER_STATE_0;
		if (pcmod == 0 && start == 0x0)
			ps_desired = lowest_pow_st;
		break;
	case NVME_POWER_STATE_ACTIVE:
		/* Action unspecified if POWER CONDITION MODIFIER != 0 */
		if (pcmod == 0)
			ps_desired = POWER_STATE_0;
		break;
	case NVME_POWER_STATE_IDLE:
		/* Action unspecified if POWER CONDITION MODIFIER != [0,1,2] */
		if (pcmod == 0x0)
			ps_desired = POWER_STATE_1;
		else if (pcmod == 0x1)
			ps_desired = POWER_STATE_2;
		else if (pcmod == 0x2)
			ps_desired = POWER_STATE_3;
		break;
	case NVME_POWER_STATE_STANDBY:
		/* Action unspecified if POWER CONDITION MODIFIER != [0,1] */
		if (pcmod == 0x0)
			ps_desired = max(POWER_STATE_0, (lowest_pow_st - 2));
		else if (pcmod == 0x1)
			ps_desired = max(POWER_STATE_0, (lowest_pow_st - 1));
		break;
	case NVME_POWER_STATE_LU_CONTROL:
	default:
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
				ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
				SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		break;
	}
	nvme_sc = nvme_set_features(dev, NVME_FEAT_POWER_MGMT, ps_desired, 0,
				    NULL);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_dma;
	if (nvme_sc)
		res = nvme_sc;
 out_dma:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ctrl), mem,
			  dma_addr);
 out:
	return res;
}

/* Write Buffer Helper Functions */
/* Also using this for Format Unit with hdr passed as NULL, and buffer_id, 0 */

static int nvme_trans_send_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					u8 opcode, u32 tot_len, u32 offset,
					u8 buffer_id)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	struct nvme_command c;
	struct nvme_iod *iod = NULL;
	unsigned length;

	memset(&c, 0, sizeof(c));
	c.common.opcode = opcode;
	if (opcode == nvme_admin_download_fw) {
		if (hdr->iovec_count > 0) {
			/* Assuming SGL is not allowed for this command */
			res = nvme_trans_completion(hdr,
						SAM_STAT_CHECK_CONDITION,
						ILLEGAL_REQUEST,
						SCSI_ASC_INVALID_CDB,
						SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
			goto out;
		}
		iod = nvme_map_user_pages(dev, DMA_TO_DEVICE,
				(unsigned long)hdr->dxferp, tot_len);
		if (IS_ERR(iod)) {
			res = PTR_ERR(iod);
			goto out;
		}
		length = nvme_setup_prps(dev, iod, tot_len, GFP_KERNEL);
		if (length != tot_len) {
			res = -ENOMEM;
			goto out_unmap;
		}

		c.dlfw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
		c.dlfw.prp2 = cpu_to_le64(iod->first_dma);
		c.dlfw.numd = cpu_to_le32((tot_len/BYTES_TO_DWORDS) - 1);
		c.dlfw.offset = cpu_to_le32(offset/BYTES_TO_DWORDS);
	} else if (opcode == nvme_admin_activate_fw) {
		u32 cdw10 = buffer_id | NVME_FWACT_REPL_ACTV;
		c.common.cdw10[0] = cpu_to_le32(cdw10);
	}

	nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_unmap;
	if (nvme_sc)
		res = nvme_sc;

 out_unmap:
	if (opcode == nvme_admin_download_fw) {
		nvme_unmap_user_pages(dev, DMA_TO_DEVICE, iod);
		nvme_free_iod(dev, iod);
	}
 out:
	return res;
}

/* Mode Select Helper Functions */

static inline void nvme_trans_modesel_get_bd_len(u8 *parm_list, u8 cdb10,
						u16 *bd_len, u8 *llbaa)
{
	if (cdb10) {
		/* 10 Byte CDB */
		*bd_len = (parm_list[MODE_SELECT_10_BD_OFFSET] << 8) +
			parm_list[MODE_SELECT_10_BD_OFFSET + 1];
		*llbaa = parm_list[MODE_SELECT_10_LLBAA_OFFSET] &
				MODE_SELECT_10_LLBAA_MASK;
	} else {
		/* 6 Byte CDB */
		*bd_len = parm_list[MODE_SELECT_6_BD_OFFSET];
	}
}

static void nvme_trans_modesel_save_bd(struct nvme_ns *ns, u8 *parm_list,
					u16 idx, u16 bd_len, u8 llbaa)
{
	u16 bd_num;

	bd_num = bd_len / ((llbaa == 0) ?
			SHORT_DESC_BLOCK : LONG_DESC_BLOCK);
	/* Store block descriptor info if a FORMAT UNIT comes later */
	/* TODO Saving 1st BD info; what to do if multiple BD received? */
	if (llbaa == 0) {
		/* Standard Block Descriptor - spc4r34 7.5.5.1 */
		ns->mode_select_num_blocks =
				(parm_list[idx + 1] << 16) +
				(parm_list[idx + 2] << 8) +
				(parm_list[idx + 3]);

		ns->mode_select_block_len =
				(parm_list[idx + 5] << 16) +
				(parm_list[idx + 6] << 8) +
				(parm_list[idx + 7]);
	} else {
		/* Long LBA Block Descriptor - sbc3r27 6.4.2.3 */
		ns->mode_select_num_blocks =
				(((u64)parm_list[idx + 0]) << 56) +
				(((u64)parm_list[idx + 1]) << 48) +
				(((u64)parm_list[idx + 2]) << 40) +
				(((u64)parm_list[idx + 3]) << 32) +
				(((u64)parm_list[idx + 4]) << 24) +
				(((u64)parm_list[idx + 5]) << 16) +
				(((u64)parm_list[idx + 6]) << 8) +
				((u64)parm_list[idx + 7]);

		ns->mode_select_block_len =
				(parm_list[idx + 12] << 24) +
				(parm_list[idx + 13] << 16) +
				(parm_list[idx + 14] << 8) +
				(parm_list[idx + 15]);
	}
}

static int nvme_trans_modesel_get_mp(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					u8 *mode_page, u8 page_code)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	unsigned dword11;

	switch (page_code) {
	case MODE_PAGE_CACHING:
		dword11 = ((mode_page[2] & CACHING_MODE_PAGE_WCE_MASK) ? 1 : 0);
		nvme_sc = nvme_set_features(dev, NVME_FEAT_VOLATILE_WC, dword11,
					    0, NULL);
		res = nvme_trans_status_code(hdr, nvme_sc);
		if (res)
			break;
		if (nvme_sc) {
			res = nvme_sc;
			break;
		}
		break;
	case MODE_PAGE_CONTROL:
		break;
	case MODE_PAGE_POWER_CONDITION:
		/* Verify the OS is not trying to set timers */
		if ((mode_page[2] & 0x01) != 0 || (mode_page[3] & 0x0F) != 0) {
			res = nvme_trans_completion(hdr,
						SAM_STAT_CHECK_CONDITION,
						ILLEGAL_REQUEST,
						SCSI_ASC_INVALID_PARAMETER,
						SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
			if (!res)
				res = SNTI_INTERNAL_ERROR;
			break;
		}
		break;
	default:
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		if (!res)
			res = SNTI_INTERNAL_ERROR;
		break;
	}

	return res;
}

static int nvme_trans_modesel_data(struct nvme_ns *ns, struct sg_io_hdr *hdr,
					u8 *cmd, u16 parm_list_len, u8 pf,
					u8 sp, u8 cdb10)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u8 *parm_list;
	u16 bd_len;
	u8 llbaa = 0;
	u16 index, saved_index;
	u8 page_code;
	u16 mp_size;

	/* Get parm list from data-in/out buffer */
	parm_list = kmalloc(parm_list_len, GFP_KERNEL);
	if (parm_list == NULL) {
		res = -ENOMEM;
		goto out;
	}

	res = nvme_trans_copy_from_user(hdr, parm_list, parm_list_len);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out_mem;

	nvme_trans_modesel_get_bd_len(parm_list, cdb10, &bd_len, &llbaa);
	index = (cdb10) ? (MODE_SELECT_10_MPH_SIZE) : (MODE_SELECT_6_MPH_SIZE);

	if (bd_len != 0) {
		/* Block Descriptors present, parse */
		nvme_trans_modesel_save_bd(ns, parm_list, index, bd_len, llbaa);
		index += bd_len;
	}
	saved_index = index;

	/* Multiple mode pages may be present; iterate through all */
	/* In 1st Iteration, don't do NVME Command, only check for CDB errors */
	do {
		page_code = parm_list[index] & MODE_SELECT_PAGE_CODE_MASK;
		mp_size = parm_list[index + 1] + 2;
		if ((page_code != MODE_PAGE_CACHING) &&
		    (page_code != MODE_PAGE_CONTROL) &&
		    (page_code != MODE_PAGE_POWER_CONDITION)) {
			res = nvme_trans_completion(hdr,
						SAM_STAT_CHECK_CONDITION,
						ILLEGAL_REQUEST,
						SCSI_ASC_INVALID_CDB,
						SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
			goto out_mem;
		}
		index += mp_size;
	} while (index < parm_list_len);

	/* In 2nd Iteration, do the NVME Commands */
	index = saved_index;
	do {
		page_code = parm_list[index] & MODE_SELECT_PAGE_CODE_MASK;
		mp_size = parm_list[index + 1] + 2;
		res = nvme_trans_modesel_get_mp(ns, hdr, &parm_list[index],
								page_code);
		if (res != SNTI_TRANSLATION_SUCCESS)
			break;
		index += mp_size;
	} while (index < parm_list_len);

 out_mem:
	kfree(parm_list);
 out:
	return res;
}

/* Format Unit Helper Functions */

static int nvme_trans_fmt_set_blk_size_count(struct nvme_ns *ns,
					     struct sg_io_hdr *hdr)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ns *id_ns;
	u8 flbas;

	/*
	 * SCSI Expects a MODE SELECT would have been issued prior to
	 * a FORMAT UNIT, and the block size and number would be used
	 * from the block descriptor in it. If a MODE SELECT had not
	 * been issued, FORMAT shall use the current values for both.
	 */

	if (ns->mode_select_num_blocks == 0 || ns->mode_select_block_len == 0) {
		mem = dma_alloc_coherent(&dev->pci_dev->dev,
			sizeof(struct nvme_id_ns), &dma_addr, GFP_KERNEL);
		if (mem == NULL) {
			res = -ENOMEM;
			goto out;
		}
		/* nvme ns identify */
		nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
		res = nvme_trans_status_code(hdr, nvme_sc);
		if (res)
			goto out_dma;
		if (nvme_sc) {
			res = nvme_sc;
			goto out_dma;
		}
		id_ns = mem;

		if (ns->mode_select_num_blocks == 0)
			ns->mode_select_num_blocks = le64_to_cpu(id_ns->ncap);
		if (ns->mode_select_block_len == 0) {
			flbas = (id_ns->flbas) & 0x0F;
			ns->mode_select_block_len =
						(1 << (id_ns->lbaf[flbas].ds));
		}
 out_dma:
		dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
				  mem, dma_addr);
	}
 out:
	return res;
}

static int nvme_trans_fmt_get_parm_header(struct sg_io_hdr *hdr, u8 len,
					u8 format_prot_info, u8 *nvme_pf_code)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u8 *parm_list;
	u8 pf_usage, pf_code;

	parm_list = kmalloc(len, GFP_KERNEL);
	if (parm_list == NULL) {
		res = -ENOMEM;
		goto out;
	}
	res = nvme_trans_copy_from_user(hdr, parm_list, len);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out_mem;

	if ((parm_list[FORMAT_UNIT_IMMED_OFFSET] &
				FORMAT_UNIT_IMMED_MASK) != 0) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out_mem;
	}

	if (len == FORMAT_UNIT_LONG_PARM_LIST_LEN &&
	    (parm_list[FORMAT_UNIT_PROT_INT_OFFSET] & 0x0F) != 0) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out_mem;
	}
	pf_usage = parm_list[FORMAT_UNIT_PROT_FIELD_USAGE_OFFSET] &
			FORMAT_UNIT_PROT_FIELD_USAGE_MASK;
	pf_code = (pf_usage << 2) | format_prot_info;
	switch (pf_code) {
	case 0:
		*nvme_pf_code = 0;
		break;
	case 2:
		*nvme_pf_code = 1;
		break;
	case 3:
		*nvme_pf_code = 2;
		break;
	case 7:
		*nvme_pf_code = 3;
		break;
	default:
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		break;
	}

 out_mem:
	kfree(parm_list);
 out:
	return res;
}

static int nvme_trans_fmt_send_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
				   u8 prot_info)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ns *id_ns;
	u8 i;
	u8 flbas, nlbaf;
	u8 selected_lbaf = 0xFF;
	u32 cdw10 = 0;
	struct nvme_command c;

	/* Loop thru LBAF's in id_ns to match reqd lbaf, put in cdw10 */
	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
							&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out;
	}
	/* nvme ns identify */
	nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_dma;
	if (nvme_sc) {
		res = nvme_sc;
		goto out_dma;
	}
	id_ns = mem;
	flbas = (id_ns->flbas) & 0x0F;
	nlbaf = id_ns->nlbaf;

	for (i = 0; i < nlbaf; i++) {
		if (ns->mode_select_block_len == (1 << (id_ns->lbaf[i].ds))) {
			selected_lbaf = i;
			break;
		}
	}
	if (selected_lbaf > 0x0F) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
				ILLEGAL_REQUEST, SCSI_ASC_INVALID_PARAMETER,
				SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
	}
	if (ns->mode_select_num_blocks != le64_to_cpu(id_ns->ncap)) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
				ILLEGAL_REQUEST, SCSI_ASC_INVALID_PARAMETER,
				SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
	}

	cdw10 |= prot_info << 5;
	cdw10 |= selected_lbaf & 0x0F;
	memset(&c, 0, sizeof(c));
	c.format.opcode = nvme_admin_format_nvm;
	c.format.nsid = cpu_to_le32(ns->ns_id);
	c.format.cdw10 = cpu_to_le32(cdw10);

	nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_dma;
	if (nvme_sc)
		res = nvme_sc;

 out_dma:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
			  dma_addr);
 out:
	return res;
}

/* Read/Write Helper Functions */

static inline void nvme_trans_get_io_cdb6(u8 *cmd,
					struct nvme_trans_io_cdb *cdb_info)
{
	cdb_info->fua = 0;
	cdb_info->prot_info = 0;
	cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_6_CDB_LBA_OFFSET) &
					IO_6_CDB_LBA_MASK;
	cdb_info->xfer_len = GET_U8_FROM_CDB(cmd, IO_6_CDB_TX_LEN_OFFSET);

	/* sbc3r27 sec 5.32 - TRANSFER LEN of 0 implies a 256 Block transfer */
	if (cdb_info->xfer_len == 0)
		cdb_info->xfer_len = IO_6_DEFAULT_TX_LEN;
}

static inline void nvme_trans_get_io_cdb10(u8 *cmd,
					struct nvme_trans_io_cdb *cdb_info)
{
	cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_10_CDB_FUA_OFFSET) &
					IO_CDB_FUA_MASK;
	cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_10_CDB_WP_OFFSET) &
					IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
	cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_10_CDB_LBA_OFFSET);
	cdb_info->xfer_len = GET_U16_FROM_CDB(cmd, IO_10_CDB_TX_LEN_OFFSET);
}

static inline void nvme_trans_get_io_cdb12(u8 *cmd,
					struct nvme_trans_io_cdb *cdb_info)
{
	cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_12_CDB_FUA_OFFSET) &
					IO_CDB_FUA_MASK;
	cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_12_CDB_WP_OFFSET) &
					IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
	cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_12_CDB_LBA_OFFSET);
	cdb_info->xfer_len = GET_U32_FROM_CDB(cmd, IO_12_CDB_TX_LEN_OFFSET);
}

static inline void nvme_trans_get_io_cdb16(u8 *cmd,
					struct nvme_trans_io_cdb *cdb_info)
{
	cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_16_CDB_FUA_OFFSET) &
					IO_CDB_FUA_MASK;
	cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_16_CDB_WP_OFFSET) &
					IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
	cdb_info->lba = GET_U64_FROM_CDB(cmd, IO_16_CDB_LBA_OFFSET);
	cdb_info->xfer_len = GET_U32_FROM_CDB(cmd, IO_16_CDB_TX_LEN_OFFSET);
}

static inline u32 nvme_trans_io_get_num_cmds(struct sg_io_hdr *hdr,
					struct nvme_trans_io_cdb *cdb_info,
					u32 max_blocks)
{
	/* If using iovecs, send one nvme command per vector */
	if (hdr->iovec_count > 0)
		return hdr->iovec_count;
	else if (cdb_info->xfer_len > max_blocks)
		return ((cdb_info->xfer_len - 1) / max_blocks) + 1;
	else
		return 1;
}

static u16 nvme_trans_io_get_control(struct nvme_ns *ns,
					struct nvme_trans_io_cdb *cdb_info)
{
	u16 control = 0;

	/* When Protection information support is added, implement here */

	if (cdb_info->fua > 0)
		control |= NVME_RW_FUA;

	return control;
}

static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
				struct nvme_trans_io_cdb *cdb_info, u8 is_write)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_dev *dev = ns->dev;
	u32 num_cmds;
	struct nvme_iod *iod;
	u64 unit_len;
	u64 unit_num_blocks;	/* Number of blocks to xfer in each nvme cmd */
	u32 retcode;
	u32 i = 0;
	u64 nvme_offset = 0;
	void __user *next_mapping_addr;
	struct nvme_command c;
	u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read);
	u16 control;
	u32 max_blocks = queue_max_hw_sectors(ns->queue);

	num_cmds = nvme_trans_io_get_num_cmds(hdr, cdb_info, max_blocks);

	/*
	 * This loop handles two cases.
	 * First, when an SGL is used in the form of an iovec list:
	 *   - Use iov_base as the next mapping address for the nvme command_id
	 *   - Use iov_len as the data transfer length for the command.
	 * Second, when we have a single buffer
	 *   - If larger than max_blocks, split into chunks, offset
	 *        each nvme command accordingly.
	 */
	for (i = 0; i < num_cmds; i++) {
		memset(&c, 0, sizeof(c));
		if (hdr->iovec_count > 0) {
			struct sg_iovec sgl;

			retcode = copy_from_user(&sgl, hdr->dxferp +
					i * sizeof(struct sg_iovec),
					sizeof(struct sg_iovec));
			if (retcode)
				return -EFAULT;
			unit_len = sgl.iov_len;
			unit_num_blocks = unit_len >> ns->lba_shift;
			next_mapping_addr = sgl.iov_base;
		} else {
			unit_num_blocks = min((u64)max_blocks,
					(cdb_info->xfer_len - nvme_offset));
			unit_len = unit_num_blocks << ns->lba_shift;
			next_mapping_addr = hdr->dxferp +
					((1 << ns->lba_shift) * nvme_offset);
		}

		c.rw.opcode = opcode;
		c.rw.nsid = cpu_to_le32(ns->ns_id);
		c.rw.slba = cpu_to_le64(cdb_info->lba + nvme_offset);
		c.rw.length = cpu_to_le16(unit_num_blocks - 1);
		control = nvme_trans_io_get_control(ns, cdb_info);
		c.rw.control = cpu_to_le16(control);

		iod = nvme_map_user_pages(dev,
			(is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
			(unsigned long)next_mapping_addr, unit_len);
		if (IS_ERR(iod)) {
			res = PTR_ERR(iod);
			goto out;
		}
		retcode = nvme_setup_prps(dev, iod, unit_len, GFP_KERNEL);
		if (retcode != unit_len) {
			nvme_unmap_user_pages(dev,
				(is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
				iod);
			nvme_free_iod(dev, iod);
			res = -ENOMEM;
			goto out;
		}
		c.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
		c.rw.prp2 = cpu_to_le64(iod->first_dma);

		nvme_offset += unit_num_blocks;

		nvme_sc = nvme_submit_io_cmd(dev, ns, &c, NULL);
		if (nvme_sc != NVME_SC_SUCCESS) {
			nvme_unmap_user_pages(dev,
				(is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
				iod);
			nvme_free_iod(dev, iod);
			res = nvme_trans_status_code(hdr, nvme_sc);
			goto out;
		}
		nvme_unmap_user_pages(dev,
				(is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
				iod);
		nvme_free_iod(dev, iod);
	}
	res = nvme_trans_status_code(hdr, NVME_SC_SUCCESS);

 out:
	return res;
}


/* SCSI Command Translation Functions */

static int nvme_trans_io(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 is_write,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	struct nvme_trans_io_cdb cdb_info;
	u8 opcode = cmd[0];
	u64 xfer_bytes;
	u64 sum_iov_len = 0;
	struct sg_iovec sgl;
	int i;
	size_t not_copied;

	/* Extract Fields from CDB */
	switch (opcode) {
	case WRITE_6:
	case READ_6:
		nvme_trans_get_io_cdb6(cmd, &cdb_info);
		break;
	case WRITE_10:
	case READ_10:
		nvme_trans_get_io_cdb10(cmd, &cdb_info);
		break;
	case WRITE_12:
	case READ_12:
		nvme_trans_get_io_cdb12(cmd, &cdb_info);
		break;
	case WRITE_16:
	case READ_16:
		nvme_trans_get_io_cdb16(cmd, &cdb_info);
		break;
	default:
		/* Will never really reach here */
		res = SNTI_INTERNAL_ERROR;
		goto out;
	}

	/* Calculate total length of transfer (in bytes) */
	if (hdr->iovec_count > 0) {
		for (i = 0; i < hdr->iovec_count; i++) {
			not_copied = copy_from_user(&sgl, hdr->dxferp +
						i * sizeof(struct sg_iovec),
						sizeof(struct sg_iovec));
			if (not_copied)
				return -EFAULT;
			sum_iov_len += sgl.iov_len;
			/* IO vector sizes should be multiples of block size */
			if (sgl.iov_len % (1 << ns->lba_shift) != 0) {
				res = nvme_trans_completion(hdr,
						SAM_STAT_CHECK_CONDITION,
						ILLEGAL_REQUEST,
						SCSI_ASC_INVALID_PARAMETER,
						SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
				goto out;
			}
		}
	} else {
		sum_iov_len = hdr->dxfer_len;
	}

	/* As Per sg ioctl howto, if the lengths differ, use the lower one */
	xfer_bytes = min(((u64)hdr->dxfer_len), sum_iov_len);

	/* If block count and actual data buffer size dont match, error out */
	if (xfer_bytes != (cdb_info.xfer_len << ns->lba_shift)) {
		res = -EINVAL;
		goto out;
	}

	/* Check for 0 length transfer - it is not illegal */
	if (cdb_info.xfer_len == 0)
		goto out;

	/* Send NVMe IO Command(s) */
	res = nvme_trans_do_nvme_io(ns, hdr, &cdb_info, is_write);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out;

 out:
	return res;
}

static int nvme_trans_inquiry(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u8 evpd;
	u8 page_code;
	int alloc_len;
	u8 *inq_response;

	evpd = GET_INQ_EVPD_BIT(cmd);
	page_code = GET_INQ_PAGE_CODE(cmd);
	alloc_len = GET_INQ_ALLOC_LENGTH(cmd);

	inq_response = kmalloc(max(alloc_len, STANDARD_INQUIRY_LENGTH),
				GFP_KERNEL);
	if (inq_response == NULL) {
		res = -ENOMEM;
		goto out_mem;
	}

	if (evpd == 0) {
		if (page_code == INQ_STANDARD_INQUIRY_PAGE) {
			res = nvme_trans_standard_inquiry_page(ns, hdr,
						inq_response, alloc_len);
		} else {
			res = nvme_trans_completion(hdr,
						SAM_STAT_CHECK_CONDITION,
						ILLEGAL_REQUEST,
						SCSI_ASC_INVALID_CDB,
						SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		}
	} else {
		switch (page_code) {
		case VPD_SUPPORTED_PAGES:
			res = nvme_trans_supported_vpd_pages(ns, hdr,
						inq_response, alloc_len);
			break;
		case VPD_SERIAL_NUMBER:
			res = nvme_trans_unit_serial_page(ns, hdr, inq_response,
								alloc_len);
			break;
		case VPD_DEVICE_IDENTIFIERS:
			res = nvme_trans_device_id_page(ns, hdr, inq_response,
								alloc_len);
			break;
		case VPD_EXTENDED_INQUIRY:
			res = nvme_trans_ext_inq_page(ns, hdr, alloc_len);
			break;
		case VPD_BLOCK_LIMITS:
			res = nvme_trans_bdev_limits_page(ns, hdr, inq_response,
								alloc_len);
			break;
		case VPD_BLOCK_DEV_CHARACTERISTICS:
			res = nvme_trans_bdev_char_page(ns, hdr, alloc_len);
			break;
		default:
			res = nvme_trans_completion(hdr,
						SAM_STAT_CHECK_CONDITION,
						ILLEGAL_REQUEST,
						SCSI_ASC_INVALID_CDB,
						SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
			break;
		}
	}
	kfree(inq_response);
 out_mem:
	return res;
}

static int nvme_trans_log_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u16 alloc_len;
	u8 sp;
	u8 pc;
	u8 page_code;

	sp = GET_U8_FROM_CDB(cmd, LOG_SENSE_CDB_SP_OFFSET);
	if (sp != LOG_SENSE_CDB_SP_NOT_ENABLED) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out;
	}
	pc = GET_U8_FROM_CDB(cmd, LOG_SENSE_CDB_PC_OFFSET);
	page_code = pc & LOG_SENSE_CDB_PAGE_CODE_MASK;
	pc = (pc & LOG_SENSE_CDB_PC_MASK) >> LOG_SENSE_CDB_PC_SHIFT;
	if (pc != LOG_SENSE_CDB_PC_CUMULATIVE_VALUES) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out;
	}
	alloc_len = GET_U16_FROM_CDB(cmd, LOG_SENSE_CDB_ALLOC_LENGTH_OFFSET);
	switch (page_code) {
	case LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE:
		res = nvme_trans_log_supp_pages(ns, hdr, alloc_len);
		break;
	case LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE:
		res = nvme_trans_log_info_exceptions(ns, hdr, alloc_len);
		break;
	case LOG_PAGE_TEMPERATURE_PAGE:
		res = nvme_trans_log_temperature(ns, hdr, alloc_len);
		break;
	default:
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		break;
	}

 out:
	return res;
}

static int nvme_trans_mode_select(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u8 cdb10 = 0;
	u16 parm_list_len;
	u8 page_format;
	u8 save_pages;

	page_format = GET_U8_FROM_CDB(cmd, MODE_SELECT_CDB_PAGE_FORMAT_OFFSET);
	page_format &= MODE_SELECT_CDB_PAGE_FORMAT_MASK;

	save_pages = GET_U8_FROM_CDB(cmd, MODE_SELECT_CDB_SAVE_PAGES_OFFSET);
	save_pages &= MODE_SELECT_CDB_SAVE_PAGES_MASK;

	if (GET_OPCODE(cmd) == MODE_SELECT) {
		parm_list_len = GET_U8_FROM_CDB(cmd,
				MODE_SELECT_6_CDB_PARAM_LIST_LENGTH_OFFSET);
	} else {
		parm_list_len = GET_U16_FROM_CDB(cmd,
				MODE_SELECT_10_CDB_PARAM_LIST_LENGTH_OFFSET);
		cdb10 = 1;
	}

	if (parm_list_len != 0) {
		/*
		 * According to SPC-4 r24, a paramter list length field of 0
		 * shall not be considered an error
		 */
		res = nvme_trans_modesel_data(ns, hdr, cmd, parm_list_len,
						page_format, save_pages, cdb10);
	}

	return res;
}

static int nvme_trans_mode_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u16 alloc_len;
	u8 cdb10 = 0;
	u8 page_code;
	u8 pc;

	if (GET_OPCODE(cmd) == MODE_SENSE) {
		alloc_len = GET_U8_FROM_CDB(cmd, MODE_SENSE6_ALLOC_LEN_OFFSET);
	} else {
		alloc_len = GET_U16_FROM_CDB(cmd,
						MODE_SENSE10_ALLOC_LEN_OFFSET);
		cdb10 = 1;
	}

	pc = GET_U8_FROM_CDB(cmd, MODE_SENSE_PAGE_CONTROL_OFFSET) &
						MODE_SENSE_PAGE_CONTROL_MASK;
	if (pc != MODE_SENSE_PC_CURRENT_VALUES) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out;
	}

	page_code = GET_U8_FROM_CDB(cmd, MODE_SENSE_PAGE_CODE_OFFSET) &
					MODE_SENSE_PAGE_CODE_MASK;
	switch (page_code) {
	case MODE_PAGE_CACHING:
		res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
						cdb10,
						&nvme_trans_fill_caching_page,
						MODE_PAGE_CACHING_LEN);
		break;
	case MODE_PAGE_CONTROL:
		res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
						cdb10,
						&nvme_trans_fill_control_page,
						MODE_PAGE_CONTROL_LEN);
		break;
	case MODE_PAGE_POWER_CONDITION:
		res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
						cdb10,
						&nvme_trans_fill_pow_cnd_page,
						MODE_PAGE_POW_CND_LEN);
		break;
	case MODE_PAGE_INFO_EXCEP:
		res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
						cdb10,
						&nvme_trans_fill_inf_exc_page,
						MODE_PAGE_INF_EXC_LEN);
		break;
	case MODE_PAGE_RETURN_ALL:
		res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
						cdb10,
						&nvme_trans_fill_all_pages,
						MODE_PAGE_ALL_LEN);
		break;
	default:
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		break;
	}

 out:
	return res;
}

static int nvme_trans_read_capacity(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	u32 alloc_len = READ_CAP_10_RESP_SIZE;
	u32 resp_size = READ_CAP_10_RESP_SIZE;
	u32 xfer_len;
	u8 cdb16;
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ns *id_ns;
	u8 *response;

	cdb16 = IS_READ_CAP_16(cmd);
	if (cdb16) {
		alloc_len = GET_READ_CAP_16_ALLOC_LENGTH(cmd);
		resp_size = READ_CAP_16_RESP_SIZE;
	}

	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
							&dma_addr, GFP_KERNEL);
	if (mem == NULL) {
		res = -ENOMEM;
		goto out;
	}
	/* nvme ns identify */
	nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out_dma;
	if (nvme_sc) {
		res = nvme_sc;
		goto out_dma;
	}
	id_ns = mem;

	response = kzalloc(resp_size, GFP_KERNEL);
	if (response == NULL) {
		res = -ENOMEM;
		goto out_dma;
	}
	nvme_trans_fill_read_cap(response, id_ns, cdb16);

	xfer_len = min(alloc_len, resp_size);
	res = nvme_trans_copy_to_user(hdr, response, xfer_len);

	kfree(response);
 out_dma:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
			  dma_addr);
 out:
	return res;
}

static int nvme_trans_report_luns(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	u32 alloc_len, xfer_len, resp_size;
	u8 select_report;
	u8 *response;
	struct nvme_dev *dev = ns->dev;
	dma_addr_t dma_addr;
	void *mem;
	struct nvme_id_ctrl *id_ctrl;
	u32 ll_length, lun_id;
	u8 lun_id_offset = REPORT_LUNS_FIRST_LUN_OFFSET;
	__be32 tmp_len;

	alloc_len = GET_REPORT_LUNS_ALLOC_LENGTH(cmd);
	select_report = GET_U8_FROM_CDB(cmd, REPORT_LUNS_SR_OFFSET);

	if ((select_report != ALL_LUNS_RETURNED) &&
	    (select_report != ALL_WELL_KNOWN_LUNS_RETURNED) &&
	    (select_report != RESTRICTED_LUNS_RETURNED)) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out;
	} else {
		/* NVMe Controller Identify */
		mem = dma_alloc_coherent(&dev->pci_dev->dev,
					sizeof(struct nvme_id_ctrl),
					&dma_addr, GFP_KERNEL);
		if (mem == NULL) {
			res = -ENOMEM;
			goto out;
		}
		nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
		res = nvme_trans_status_code(hdr, nvme_sc);
		if (res)
			goto out_dma;
		if (nvme_sc) {
			res = nvme_sc;
			goto out_dma;
		}
		id_ctrl = mem;
		ll_length = le32_to_cpu(id_ctrl->nn) * LUN_ENTRY_SIZE;
		resp_size = ll_length + LUN_DATA_HEADER_SIZE;

		if (alloc_len < resp_size) {
			res = nvme_trans_completion(hdr,
					SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
			goto out_dma;
		}

		response = kzalloc(resp_size, GFP_KERNEL);
		if (response == NULL) {
			res = -ENOMEM;
			goto out_dma;
		}

		/* The first LUN ID will always be 0 per the SAM spec */
		for (lun_id = 0; lun_id < le32_to_cpu(id_ctrl->nn); lun_id++) {
			/*
			 * Set the LUN Id and then increment to the next LUN
			 * location in the parameter data.
			 */
			__be64 tmp_id = cpu_to_be64(lun_id);
			memcpy(&response[lun_id_offset], &tmp_id, sizeof(u64));
			lun_id_offset += LUN_ENTRY_SIZE;
		}
		tmp_len = cpu_to_be32(ll_length);
		memcpy(response, &tmp_len, sizeof(u32));
	}

	xfer_len = min(alloc_len, resp_size);
	res = nvme_trans_copy_to_user(hdr, response, xfer_len);

	kfree(response);
 out_dma:
	dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ctrl), mem,
			  dma_addr);
 out:
	return res;
}

static int nvme_trans_request_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u8 alloc_len, xfer_len, resp_size;
	u8 desc_format;
	u8 *response;

	alloc_len = GET_REQUEST_SENSE_ALLOC_LENGTH(cmd);
	desc_format = GET_U8_FROM_CDB(cmd, REQUEST_SENSE_DESC_OFFSET);
	desc_format &= REQUEST_SENSE_DESC_MASK;

	resp_size = ((desc_format) ? (DESC_FMT_SENSE_DATA_SIZE) :
					(FIXED_FMT_SENSE_DATA_SIZE));
	response = kzalloc(resp_size, GFP_KERNEL);
	if (response == NULL) {
		res = -ENOMEM;
		goto out;
	}

	if (desc_format == DESCRIPTOR_FORMAT_SENSE_DATA_TYPE) {
		/* Descriptor Format Sense Data */
		response[0] = DESC_FORMAT_SENSE_DATA;
		response[1] = NO_SENSE;
		/* TODO How is LOW POWER CONDITION ON handled? (byte 2) */
		response[2] = SCSI_ASC_NO_SENSE;
		response[3] = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		/* SDAT_OVFL = 0 | Additional Sense Length = 0 */
	} else {
		/* Fixed Format Sense Data */
		response[0] = FIXED_SENSE_DATA;
		/* Byte 1 = Obsolete */
		response[2] = NO_SENSE; /* FM, EOM, ILI, SDAT_OVFL = 0 */
		/* Bytes 3-6 - Information - set to zero */
		response[7] = FIXED_SENSE_DATA_ADD_LENGTH;
		/* Bytes 8-11 - Cmd Specific Information - set to zero */
		response[12] = SCSI_ASC_NO_SENSE;
		response[13] = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
		/* Byte 14 = Field Replaceable Unit Code = 0 */
		/* Bytes 15-17 - SKSV=0; Sense Key Specific = 0 */
	}

	xfer_len = min(alloc_len, resp_size);
	res = nvme_trans_copy_to_user(hdr, response, xfer_len);

	kfree(response);
 out:
	return res;
}

static int nvme_trans_security_protocol(struct nvme_ns *ns,
					struct sg_io_hdr *hdr,
					u8 *cmd)
{
	return nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
				ILLEGAL_REQUEST, SCSI_ASC_ILLEGAL_COMMAND,
				SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
}

static int nvme_trans_start_stop(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_command c;
	u8 immed, pcmod, pc, no_flush, start;

	immed = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_IMMED_OFFSET);
	pcmod = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_POWER_COND_MOD_OFFSET);
	pc = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_POWER_COND_OFFSET);
	no_flush = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_NO_FLUSH_OFFSET);
	start = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_START_OFFSET);

	immed &= START_STOP_UNIT_CDB_IMMED_MASK;
	pcmod &= START_STOP_UNIT_CDB_POWER_COND_MOD_MASK;
	pc = (pc & START_STOP_UNIT_CDB_POWER_COND_MASK) >> NIBBLE_SHIFT;
	no_flush &= START_STOP_UNIT_CDB_NO_FLUSH_MASK;
	start &= START_STOP_UNIT_CDB_START_MASK;

	if (immed != 0) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
	} else {
		if (no_flush == 0) {
			/* Issue NVME FLUSH command prior to START STOP UNIT */
			memset(&c, 0, sizeof(c));
			c.common.opcode = nvme_cmd_flush;
			c.common.nsid = cpu_to_le32(ns->ns_id);

			nvme_sc = nvme_submit_io_cmd(ns->dev, ns, &c, NULL);
			res = nvme_trans_status_code(hdr, nvme_sc);
			if (res)
				goto out;
			if (nvme_sc) {
				res = nvme_sc;
				goto out;
			}
		}
		/* Setup the expected power state transition */
		res = nvme_trans_power_state(ns, hdr, pc, pcmod, start);
	}

 out:
	return res;
}

static int nvme_trans_synchronize_cache(struct nvme_ns *ns,
					struct sg_io_hdr *hdr, u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	int nvme_sc;
	struct nvme_command c;

	memset(&c, 0, sizeof(c));
	c.common.opcode = nvme_cmd_flush;
	c.common.nsid = cpu_to_le32(ns->ns_id);

	nvme_sc = nvme_submit_io_cmd(ns->dev, ns, &c, NULL);

	res = nvme_trans_status_code(hdr, nvme_sc);
	if (res)
		goto out;
	if (nvme_sc)
		res = nvme_sc;

 out:
	return res;
}

static int nvme_trans_format_unit(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u8 parm_hdr_len = 0;
	u8 nvme_pf_code = 0;
	u8 format_prot_info, long_list, format_data;

	format_prot_info = GET_U8_FROM_CDB(cmd,
				FORMAT_UNIT_CDB_FORMAT_PROT_INFO_OFFSET);
	long_list = GET_U8_FROM_CDB(cmd, FORMAT_UNIT_CDB_LONG_LIST_OFFSET);
	format_data = GET_U8_FROM_CDB(cmd, FORMAT_UNIT_CDB_FORMAT_DATA_OFFSET);

	format_prot_info = (format_prot_info &
				FORMAT_UNIT_CDB_FORMAT_PROT_INFO_MASK) >>
				FORMAT_UNIT_CDB_FORMAT_PROT_INFO_SHIFT;
	long_list &= FORMAT_UNIT_CDB_LONG_LIST_MASK;
	format_data &= FORMAT_UNIT_CDB_FORMAT_DATA_MASK;

	if (format_data != 0) {
		if (format_prot_info != 0) {
			if (long_list == 0)
				parm_hdr_len = FORMAT_UNIT_SHORT_PARM_LIST_LEN;
			else
				parm_hdr_len = FORMAT_UNIT_LONG_PARM_LIST_LEN;
		}
	} else if (format_data == 0 && format_prot_info != 0) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out;
	}

	/* Get parm header from data-in/out buffer */
	/*
	 * According to the translation spec, the only fields in the parameter
	 * list we are concerned with are in the header. So allocate only that.
	 */
	if (parm_hdr_len > 0) {
		res = nvme_trans_fmt_get_parm_header(hdr, parm_hdr_len,
					format_prot_info, &nvme_pf_code);
		if (res != SNTI_TRANSLATION_SUCCESS)
			goto out;
	}

	/* Attempt to activate any previously downloaded firmware image */
	res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw, 0, 0, 0);

	/* Determine Block size and count and send format command */
	res = nvme_trans_fmt_set_blk_size_count(ns, hdr);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out;

	res = nvme_trans_fmt_send_cmd(ns, hdr, nvme_pf_code);

 out:
	return res;
}

static int nvme_trans_test_unit_ready(struct nvme_ns *ns,
					struct sg_io_hdr *hdr,
					u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	struct nvme_dev *dev = ns->dev;

	if (!(readl(&dev->bar->csts) & NVME_CSTS_RDY))
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					    NOT_READY, SCSI_ASC_LUN_NOT_READY,
					    SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
	else
		res = nvme_trans_completion(hdr, SAM_STAT_GOOD, NO_SENSE, 0, 0);

	return res;
}

static int nvme_trans_write_buffer(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	int res = SNTI_TRANSLATION_SUCCESS;
	u32 buffer_offset, parm_list_length;
	u8 buffer_id, mode;

	parm_list_length =
		GET_U24_FROM_CDB(cmd, WRITE_BUFFER_CDB_PARM_LIST_LENGTH_OFFSET);
	if (parm_list_length % BYTES_TO_DWORDS != 0) {
		/* NVMe expects Firmware file to be a whole number of DWORDS */
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out;
	}
	buffer_id = GET_U8_FROM_CDB(cmd, WRITE_BUFFER_CDB_BUFFER_ID_OFFSET);
	if (buffer_id > NVME_MAX_FIRMWARE_SLOT) {
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		goto out;
	}
	mode = GET_U8_FROM_CDB(cmd, WRITE_BUFFER_CDB_MODE_OFFSET) &
						WRITE_BUFFER_CDB_MODE_MASK;
	buffer_offset =
		GET_U24_FROM_CDB(cmd, WRITE_BUFFER_CDB_BUFFER_OFFSET_OFFSET);

	switch (mode) {
	case DOWNLOAD_SAVE_ACTIVATE:
		res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_download_fw,
						parm_list_length, buffer_offset,
						buffer_id);
		if (res != SNTI_TRANSLATION_SUCCESS)
			goto out;
		res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw,
						parm_list_length, buffer_offset,
						buffer_id);
		break;
	case DOWNLOAD_SAVE_DEFER_ACTIVATE:
		res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_download_fw,
						parm_list_length, buffer_offset,
						buffer_id);
		break;
	case ACTIVATE_DEFERRED_MICROCODE:
		res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw,
						parm_list_length, buffer_offset,
						buffer_id);
		break;
	default:
		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		break;
	}

 out:
	return res;
}

struct scsi_unmap_blk_desc {
	__be64	slba;
	__be32	nlb;
	u32	resv;
};

struct scsi_unmap_parm_list {
	__be16	unmap_data_len;
	__be16	unmap_blk_desc_data_len;
	u32	resv;
	struct scsi_unmap_blk_desc desc[0];
};

static int nvme_trans_unmap(struct nvme_ns *ns, struct sg_io_hdr *hdr,
							u8 *cmd)
{
	struct nvme_dev *dev = ns->dev;
	struct scsi_unmap_parm_list *plist;
	struct nvme_dsm_range *range;
	struct nvme_command c;
	int i, nvme_sc, res = -ENOMEM;
	u16 ndesc, list_len;
	dma_addr_t dma_addr;

	list_len = GET_U16_FROM_CDB(cmd, UNMAP_CDB_PARAM_LIST_LENGTH_OFFSET);
	if (!list_len)
		return -EINVAL;

	plist = kmalloc(list_len, GFP_KERNEL);
	if (!plist)
		return -ENOMEM;

	res = nvme_trans_copy_from_user(hdr, plist, list_len);
	if (res != SNTI_TRANSLATION_SUCCESS)
		goto out;

	ndesc = be16_to_cpu(plist->unmap_blk_desc_data_len) >> 4;
	if (!ndesc || ndesc > 256) {
		res = -EINVAL;
		goto out;
	}

	range = dma_alloc_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range),
							&dma_addr, GFP_KERNEL);
	if (!range)
		goto out;

	for (i = 0; i < ndesc; i++) {
		range[i].nlb = cpu_to_le32(be32_to_cpu(plist->desc[i].nlb));
		range[i].slba = cpu_to_le64(be64_to_cpu(plist->desc[i].slba));
		range[i].cattr = 0;
	}

	memset(&c, 0, sizeof(c));
	c.dsm.opcode = nvme_cmd_dsm;
	c.dsm.nsid = cpu_to_le32(ns->ns_id);
	c.dsm.prp1 = cpu_to_le64(dma_addr);
	c.dsm.nr = cpu_to_le32(ndesc - 1);
	c.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);

	nvme_sc = nvme_submit_io_cmd(dev, ns, &c, NULL);
	res = nvme_trans_status_code(hdr, nvme_sc);

	dma_free_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range),
							range, dma_addr);
 out:
	kfree(plist);
	return res;
}

static int nvme_scsi_translate(struct nvme_ns *ns, struct sg_io_hdr *hdr)
{
	u8 cmd[BLK_MAX_CDB];
	int retcode;
	unsigned int opcode;

	if (hdr->cmdp == NULL)
		return -EMSGSIZE;
	if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
		return -EFAULT;

	/*
	 * Prime the hdr with good status for scsi commands that don't require
	 * an nvme command for translation.
	 */
	retcode = nvme_trans_status_code(hdr, NVME_SC_SUCCESS);
	if (retcode)
		return retcode;

	opcode = cmd[0];

	switch (opcode) {
	case READ_6:
	case READ_10:
	case READ_12:
	case READ_16:
		retcode = nvme_trans_io(ns, hdr, 0, cmd);
		break;
	case WRITE_6:
	case WRITE_10:
	case WRITE_12:
	case WRITE_16:
		retcode = nvme_trans_io(ns, hdr, 1, cmd);
		break;
	case INQUIRY:
		retcode = nvme_trans_inquiry(ns, hdr, cmd);
		break;
	case LOG_SENSE:
		retcode = nvme_trans_log_sense(ns, hdr, cmd);
		break;
	case MODE_SELECT:
	case MODE_SELECT_10:
		retcode = nvme_trans_mode_select(ns, hdr, cmd);
		break;
	case MODE_SENSE:
	case MODE_SENSE_10:
		retcode = nvme_trans_mode_sense(ns, hdr, cmd);
		break;
	case READ_CAPACITY:
		retcode = nvme_trans_read_capacity(ns, hdr, cmd);
		break;
	case SERVICE_ACTION_IN_16:
		if (IS_READ_CAP_16(cmd))
			retcode = nvme_trans_read_capacity(ns, hdr, cmd);
		else
			goto out;
		break;
	case REPORT_LUNS:
		retcode = nvme_trans_report_luns(ns, hdr, cmd);
		break;
	case REQUEST_SENSE:
		retcode = nvme_trans_request_sense(ns, hdr, cmd);
		break;
	case SECURITY_PROTOCOL_IN:
	case SECURITY_PROTOCOL_OUT:
		retcode = nvme_trans_security_protocol(ns, hdr, cmd);
		break;
	case START_STOP:
		retcode = nvme_trans_start_stop(ns, hdr, cmd);
		break;
	case SYNCHRONIZE_CACHE:
		retcode = nvme_trans_synchronize_cache(ns, hdr, cmd);
		break;
	case FORMAT_UNIT:
		retcode = nvme_trans_format_unit(ns, hdr, cmd);
		break;
	case TEST_UNIT_READY:
		retcode = nvme_trans_test_unit_ready(ns, hdr, cmd);
		break;
	case WRITE_BUFFER:
		retcode = nvme_trans_write_buffer(ns, hdr, cmd);
		break;
	case UNMAP:
		retcode = nvme_trans_unmap(ns, hdr, cmd);
		break;
	default:
 out:
		retcode = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
				ILLEGAL_REQUEST, SCSI_ASC_ILLEGAL_COMMAND,
				SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
		break;
	}
	return retcode;
}

int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr)
{
	struct sg_io_hdr hdr;
	int retcode;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&hdr, u_hdr, sizeof(hdr)))
		return -EFAULT;
	if (hdr.interface_id != 'S')
		return -EINVAL;
	if (hdr.cmd_len > BLK_MAX_CDB)
		return -EINVAL;

	retcode = nvme_scsi_translate(ns, &hdr);
	if (retcode < 0)
		return retcode;
	if (retcode > 0)
		retcode = SNTI_TRANSLATION_SUCCESS;
	if (copy_to_user(u_hdr, &hdr, sizeof(sg_io_hdr_t)) > 0)
		return -EFAULT;

	return retcode;
}

int nvme_sg_get_version_num(int __user *ip)
{
	return put_user(sg_version_num, ip);
}