summaryrefslogtreecommitdiffstats
path: root/drivers/char/ipmi/ipmi_msghandler.c
blob: ec4e10fcf1a51b58f690ad329bdc068bc8252c2f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
/*
 * ipmi_msghandler.c
 *
 * Incoming and outgoing message routing for an IPMI interface.
 *
 * Author: MontaVista Software, Inc.
 *         Corey Minyard <minyard@mvista.com>
 *         source@mvista.com
 *
 * Copyright 2002 MontaVista Software Inc.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/ipmi.h>
#include <linux/ipmi_smi.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/rcupdate.h>
#include <linux/interrupt.h>

#define PFX "IPMI message handler: "

#define IPMI_DRIVER_VERSION "39.2"

static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void);
static int ipmi_init_msghandler(void);
static void smi_recv_tasklet(unsigned long);
static void handle_new_recv_msgs(ipmi_smi_t intf);

static int initialized;

#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_ipmi_root;
#endif /* CONFIG_PROC_FS */

/* Remain in auto-maintenance mode for this amount of time (in ms). */
#define IPMI_MAINTENANCE_MODE_TIMEOUT 30000

#define MAX_EVENTS_IN_QUEUE	25

/*
 * Don't let a message sit in a queue forever, always time it with at lest
 * the max message timer.  This is in milliseconds.
 */
#define MAX_MSG_TIMEOUT		60000

/*
 * The main "user" data structure.
 */
struct ipmi_user {
	struct list_head link;

	/* Set to "0" when the user is destroyed. */
	int valid;

	struct kref refcount;

	/* The upper layer that handles receive messages. */
	struct ipmi_user_hndl *handler;
	void             *handler_data;

	/* The interface this user is bound to. */
	ipmi_smi_t intf;

	/* Does this interface receive IPMI events? */
	int gets_events;
};

struct cmd_rcvr {
	struct list_head link;

	ipmi_user_t   user;
	unsigned char netfn;
	unsigned char cmd;
	unsigned int  chans;

	/*
	 * This is used to form a linked lised during mass deletion.
	 * Since this is in an RCU list, we cannot use the link above
	 * or change any data until the RCU period completes.  So we
	 * use this next variable during mass deletion so we can have
	 * a list and don't have to wait and restart the search on
	 * every individual deletion of a command.
	 */
	struct cmd_rcvr *next;
};

struct seq_table {
	unsigned int         inuse : 1;
	unsigned int         broadcast : 1;

	unsigned long        timeout;
	unsigned long        orig_timeout;
	unsigned int         retries_left;

	/*
	 * To verify on an incoming send message response that this is
	 * the message that the response is for, we keep a sequence id
	 * and increment it every time we send a message.
	 */
	long                 seqid;

	/*
	 * This is held so we can properly respond to the message on a
	 * timeout, and it is used to hold the temporary data for
	 * retransmission, too.
	 */
	struct ipmi_recv_msg *recv_msg;
};

/*
 * Store the information in a msgid (long) to allow us to find a
 * sequence table entry from the msgid.
 */
#define STORE_SEQ_IN_MSGID(seq, seqid) (((seq&0xff)<<26) | (seqid&0x3ffffff))

#define GET_SEQ_FROM_MSGID(msgid, seq, seqid) \
	do {								\
		seq = ((msgid >> 26) & 0x3f);				\
		seqid = (msgid & 0x3fffff);				\
	} while (0)

#define NEXT_SEQID(seqid) (((seqid) + 1) & 0x3fffff)

struct ipmi_channel {
	unsigned char medium;
	unsigned char protocol;

	/*
	 * My slave address.  This is initialized to IPMI_BMC_SLAVE_ADDR,
	 * but may be changed by the user.
	 */
	unsigned char address;

	/*
	 * My LUN.  This should generally stay the SMS LUN, but just in
	 * case...
	 */
	unsigned char lun;
};

#ifdef CONFIG_PROC_FS
struct ipmi_proc_entry {
	char                   *name;
	struct ipmi_proc_entry *next;
};
#endif

struct bmc_device {
	struct platform_device *dev;
	struct ipmi_device_id  id;
	unsigned char          guid[16];
	int                    guid_set;

	struct kref	       refcount;

	/* bmc device attributes */
	struct device_attribute device_id_attr;
	struct device_attribute provides_dev_sdrs_attr;
	struct device_attribute revision_attr;
	struct device_attribute firmware_rev_attr;
	struct device_attribute version_attr;
	struct device_attribute add_dev_support_attr;
	struct device_attribute manufacturer_id_attr;
	struct device_attribute product_id_attr;
	struct device_attribute guid_attr;
	struct device_attribute aux_firmware_rev_attr;
};

/*
 * Various statistics for IPMI, these index stats[] in the ipmi_smi
 * structure.
 */
enum ipmi_stat_indexes {
	/* Commands we got from the user that were invalid. */
	IPMI_STAT_sent_invalid_commands = 0,

	/* Commands we sent to the MC. */
	IPMI_STAT_sent_local_commands,

	/* Responses from the MC that were delivered to a user. */
	IPMI_STAT_handled_local_responses,

	/* Responses from the MC that were not delivered to a user. */
	IPMI_STAT_unhandled_local_responses,

	/* Commands we sent out to the IPMB bus. */
	IPMI_STAT_sent_ipmb_commands,

	/* Commands sent on the IPMB that had errors on the SEND CMD */
	IPMI_STAT_sent_ipmb_command_errs,

	/* Each retransmit increments this count. */
	IPMI_STAT_retransmitted_ipmb_commands,

	/*
	 * When a message times out (runs out of retransmits) this is
	 * incremented.
	 */
	IPMI_STAT_timed_out_ipmb_commands,

	/*
	 * This is like above, but for broadcasts.  Broadcasts are
	 * *not* included in the above count (they are expected to
	 * time out).
	 */
	IPMI_STAT_timed_out_ipmb_broadcasts,

	/* Responses I have sent to the IPMB bus. */
	IPMI_STAT_sent_ipmb_responses,

	/* The response was delivered to the user. */
	IPMI_STAT_handled_ipmb_responses,

	/* The response had invalid data in it. */
	IPMI_STAT_invalid_ipmb_responses,

	/* The response didn't have anyone waiting for it. */
	IPMI_STAT_unhandled_ipmb_responses,

	/* Commands we sent out to the IPMB bus. */
	IPMI_STAT_sent_lan_commands,

	/* Commands sent on the IPMB that had errors on the SEND CMD */
	IPMI_STAT_sent_lan_command_errs,

	/* Each retransmit increments this count. */
	IPMI_STAT_retransmitted_lan_commands,

	/*
	 * When a message times out (runs out of retransmits) this is
	 * incremented.
	 */
	IPMI_STAT_timed_out_lan_commands,

	/* Responses I have sent to the IPMB bus. */
	IPMI_STAT_sent_lan_responses,

	/* The response was delivered to the user. */
	IPMI_STAT_handled_lan_responses,

	/* The response had invalid data in it. */
	IPMI_STAT_invalid_lan_responses,

	/* The response didn't have anyone waiting for it. */
	IPMI_STAT_unhandled_lan_responses,

	/* The command was delivered to the user. */
	IPMI_STAT_handled_commands,

	/* The command had invalid data in it. */
	IPMI_STAT_invalid_commands,

	/* The command didn't have anyone waiting for it. */
	IPMI_STAT_unhandled_commands,

	/* Invalid data in an event. */
	IPMI_STAT_invalid_events,

	/* Events that were received with the proper format. */
	IPMI_STAT_events,

	/* Retransmissions on IPMB that failed. */
	IPMI_STAT_dropped_rexmit_ipmb_commands,

	/* Retransmissions on LAN that failed. */
	IPMI_STAT_dropped_rexmit_lan_commands,

	/* This *must* remain last, add new values above this. */
	IPMI_NUM_STATS
};


#define IPMI_IPMB_NUM_SEQ	64
#define IPMI_MAX_CHANNELS       16
struct ipmi_smi {
	/* What interface number are we? */
	int intf_num;

	struct kref refcount;

	/* Used for a list of interfaces. */
	struct list_head link;

	/*
	 * The list of upper layers that are using me.  seq_lock
	 * protects this.
	 */
	struct list_head users;

	/* Information to supply to users. */
	unsigned char ipmi_version_major;
	unsigned char ipmi_version_minor;

	/* Used for wake ups at startup. */
	wait_queue_head_t waitq;

	struct bmc_device *bmc;
	char *my_dev_name;
	char *sysfs_name;

	/*
	 * This is the lower-layer's sender routine.  Note that you
	 * must either be holding the ipmi_interfaces_mutex or be in
	 * an umpreemptible region to use this.  You must fetch the
	 * value into a local variable and make sure it is not NULL.
	 */
	struct ipmi_smi_handlers *handlers;
	void                     *send_info;

#ifdef CONFIG_PROC_FS
	/* A list of proc entries for this interface. */
	struct mutex           proc_entry_lock;
	struct ipmi_proc_entry *proc_entries;
#endif

	/* Driver-model device for the system interface. */
	struct device          *si_dev;

	/*
	 * A table of sequence numbers for this interface.  We use the
	 * sequence numbers for IPMB messages that go out of the
	 * interface to match them up with their responses.  A routine
	 * is called periodically to time the items in this list.
	 */
	spinlock_t       seq_lock;
	struct seq_table seq_table[IPMI_IPMB_NUM_SEQ];
	int curr_seq;

	/*
	 * Messages queued for delivery.  If delivery fails (out of memory
	 * for instance), They will stay in here to be processed later in a
	 * periodic timer interrupt.  The tasklet is for handling received
	 * messages directly from the handler.
	 */
	spinlock_t       waiting_msgs_lock;
	struct list_head waiting_msgs;
	atomic_t	 watchdog_pretimeouts_to_deliver;
	struct tasklet_struct recv_tasklet;

	/*
	 * The list of command receivers that are registered for commands
	 * on this interface.
	 */
	struct mutex     cmd_rcvrs_mutex;
	struct list_head cmd_rcvrs;

	/*
	 * Events that were queues because no one was there to receive
	 * them.
	 */
	spinlock_t       events_lock; /* For dealing with event stuff. */
	struct list_head waiting_events;
	unsigned int     waiting_events_count; /* How many events in queue? */
	char             delivering_events;
	char             event_msg_printed;

	/*
	 * The event receiver for my BMC, only really used at panic
	 * shutdown as a place to store this.
	 */
	unsigned char event_receiver;
	unsigned char event_receiver_lun;
	unsigned char local_sel_device;
	unsigned char local_event_generator;

	/* For handling of maintenance mode. */
	int maintenance_mode;
	int maintenance_mode_enable;
	int auto_maintenance_timeout;
	spinlock_t maintenance_mode_lock; /* Used in a timer... */

	/*
	 * A cheap hack, if this is non-null and a message to an
	 * interface comes in with a NULL user, call this routine with
	 * it.  Note that the message will still be freed by the
	 * caller.  This only works on the system interface.
	 */
	void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_recv_msg *msg);

	/*
	 * When we are scanning the channels for an SMI, this will
	 * tell which channel we are scanning.
	 */
	int curr_channel;

	/* Channel information */
	struct ipmi_channel channels[IPMI_MAX_CHANNELS];

	/* Proc FS stuff. */
	struct proc_dir_entry *proc_dir;
	char                  proc_dir_name[10];

	atomic_t stats[IPMI_NUM_STATS];

	/*
	 * run_to_completion duplicate of smb_info, smi_info
	 * and ipmi_serial_info structures. Used to decrease numbers of
	 * parameters passed by "low" level IPMI code.
	 */
	int run_to_completion;
};
#define to_si_intf_from_dev(device) container_of(device, struct ipmi_smi, dev)

/**
 * The driver model view of the IPMI messaging driver.
 */
static struct platform_driver ipmidriver = {
	.driver = {
		.name = "ipmi",
		.bus = &platform_bus_type
	}
};
static DEFINE_MUTEX(ipmidriver_mutex);

static LIST_HEAD(ipmi_interfaces);
static DEFINE_MUTEX(ipmi_interfaces_mutex);

/*
 * List of watchers that want to know when smi's are added and deleted.
 */
static LIST_HEAD(smi_watchers);
static DEFINE_MUTEX(smi_watchers_mutex);


#define ipmi_inc_stat(intf, stat) \
	atomic_inc(&(intf)->stats[IPMI_STAT_ ## stat])
#define ipmi_get_stat(intf, stat) \
	((unsigned int) atomic_read(&(intf)->stats[IPMI_STAT_ ## stat]))

static int is_lan_addr(struct ipmi_addr *addr)
{
	return addr->addr_type == IPMI_LAN_ADDR_TYPE;
}

static int is_ipmb_addr(struct ipmi_addr *addr)
{
	return addr->addr_type == IPMI_IPMB_ADDR_TYPE;
}

static int is_ipmb_bcast_addr(struct ipmi_addr *addr)
{
	return addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE;
}

static void free_recv_msg_list(struct list_head *q)
{
	struct ipmi_recv_msg *msg, *msg2;

	list_for_each_entry_safe(msg, msg2, q, link) {
		list_del(&msg->link);
		ipmi_free_recv_msg(msg);
	}
}

static void free_smi_msg_list(struct list_head *q)
{
	struct ipmi_smi_msg *msg, *msg2;

	list_for_each_entry_safe(msg, msg2, q, link) {
		list_del(&msg->link);
		ipmi_free_smi_msg(msg);
	}
}

static void clean_up_interface_data(ipmi_smi_t intf)
{
	int              i;
	struct cmd_rcvr  *rcvr, *rcvr2;
	struct list_head list;

	tasklet_kill(&intf->recv_tasklet);

	free_smi_msg_list(&intf->waiting_msgs);
	free_recv_msg_list(&intf->waiting_events);

	/*
	 * Wholesale remove all the entries from the list in the
	 * interface and wait for RCU to know that none are in use.
	 */
	mutex_lock(&intf->cmd_rcvrs_mutex);
	INIT_LIST_HEAD(&list);
	list_splice_init_rcu(&intf->cmd_rcvrs, &list, synchronize_rcu);
	mutex_unlock(&intf->cmd_rcvrs_mutex);

	list_for_each_entry_safe(rcvr, rcvr2, &list, link)
		kfree(rcvr);

	for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
		if ((intf->seq_table[i].inuse)
					&& (intf->seq_table[i].recv_msg))
			ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
	}
}

static void intf_free(struct kref *ref)
{
	ipmi_smi_t intf = container_of(ref, struct ipmi_smi, refcount);

	clean_up_interface_data(intf);
	kfree(intf);
}

struct watcher_entry {
	int              intf_num;
	ipmi_smi_t       intf;
	struct list_head link;
};

int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher)
{
	ipmi_smi_t intf;
	LIST_HEAD(to_deliver);
	struct watcher_entry *e, *e2;

	mutex_lock(&smi_watchers_mutex);

	mutex_lock(&ipmi_interfaces_mutex);

	/* Build a list of things to deliver. */
	list_for_each_entry(intf, &ipmi_interfaces, link) {
		if (intf->intf_num == -1)
			continue;
		e = kmalloc(sizeof(*e), GFP_KERNEL);
		if (!e)
			goto out_err;
		kref_get(&intf->refcount);
		e->intf = intf;
		e->intf_num = intf->intf_num;
		list_add_tail(&e->link, &to_deliver);
	}

	/* We will succeed, so add it to the list. */
	list_add(&watcher->link, &smi_watchers);

	mutex_unlock(&ipmi_interfaces_mutex);

	list_for_each_entry_safe(e, e2, &to_deliver, link) {
		list_del(&e->link);
		watcher->new_smi(e->intf_num, e->intf->si_dev);
		kref_put(&e->intf->refcount, intf_free);
		kfree(e);
	}

	mutex_unlock(&smi_watchers_mutex);

	return 0;

 out_err:
	mutex_unlock(&ipmi_interfaces_mutex);
	mutex_unlock(&smi_watchers_mutex);
	list_for_each_entry_safe(e, e2, &to_deliver, link) {
		list_del(&e->link);
		kref_put(&e->intf->refcount, intf_free);
		kfree(e);
	}
	return -ENOMEM;
}
EXPORT_SYMBOL(ipmi_smi_watcher_register);

int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher)
{
	mutex_lock(&smi_watchers_mutex);
	list_del(&(watcher->link));
	mutex_unlock(&smi_watchers_mutex);
	return 0;
}
EXPORT_SYMBOL(ipmi_smi_watcher_unregister);

/*
 * Must be called with smi_watchers_mutex held.
 */
static void
call_smi_watchers(int i, struct device *dev)
{
	struct ipmi_smi_watcher *w;

	list_for_each_entry(w, &smi_watchers, link) {
		if (try_module_get(w->owner)) {
			w->new_smi(i, dev);
			module_put(w->owner);
		}
	}
}

static int
ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2)
{
	if (addr1->addr_type != addr2->addr_type)
		return 0;

	if (addr1->channel != addr2->channel)
		return 0;

	if (addr1->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
		struct ipmi_system_interface_addr *smi_addr1
		    = (struct ipmi_system_interface_addr *) addr1;
		struct ipmi_system_interface_addr *smi_addr2
		    = (struct ipmi_system_interface_addr *) addr2;
		return (smi_addr1->lun == smi_addr2->lun);
	}

	if (is_ipmb_addr(addr1) || is_ipmb_bcast_addr(addr1)) {
		struct ipmi_ipmb_addr *ipmb_addr1
		    = (struct ipmi_ipmb_addr *) addr1;
		struct ipmi_ipmb_addr *ipmb_addr2
		    = (struct ipmi_ipmb_addr *) addr2;

		return ((ipmb_addr1->slave_addr == ipmb_addr2->slave_addr)
			&& (ipmb_addr1->lun == ipmb_addr2->lun));
	}

	if (is_lan_addr(addr1)) {
		struct ipmi_lan_addr *lan_addr1
			= (struct ipmi_lan_addr *) addr1;
		struct ipmi_lan_addr *lan_addr2
		    = (struct ipmi_lan_addr *) addr2;

		return ((lan_addr1->remote_SWID == lan_addr2->remote_SWID)
			&& (lan_addr1->local_SWID == lan_addr2->local_SWID)
			&& (lan_addr1->session_handle
			    == lan_addr2->session_handle)
			&& (lan_addr1->lun == lan_addr2->lun));
	}

	return 1;
}

int ipmi_validate_addr(struct ipmi_addr *addr, int len)
{
	if (len < sizeof(struct ipmi_system_interface_addr))
		return -EINVAL;

	if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
		if (addr->channel != IPMI_BMC_CHANNEL)
			return -EINVAL;
		return 0;
	}

	if ((addr->channel == IPMI_BMC_CHANNEL)
	    || (addr->channel >= IPMI_MAX_CHANNELS)
	    || (addr->channel < 0))
		return -EINVAL;

	if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
		if (len < sizeof(struct ipmi_ipmb_addr))
			return -EINVAL;
		return 0;
	}

	if (is_lan_addr(addr)) {
		if (len < sizeof(struct ipmi_lan_addr))
			return -EINVAL;
		return 0;
	}

	return -EINVAL;
}
EXPORT_SYMBOL(ipmi_validate_addr);

unsigned int ipmi_addr_length(int addr_type)
{
	if (addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
		return sizeof(struct ipmi_system_interface_addr);

	if ((addr_type == IPMI_IPMB_ADDR_TYPE)
			|| (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
		return sizeof(struct ipmi_ipmb_addr);

	if (addr_type == IPMI_LAN_ADDR_TYPE)
		return sizeof(struct ipmi_lan_addr);

	return 0;
}
EXPORT_SYMBOL(ipmi_addr_length);

static void deliver_response(struct ipmi_recv_msg *msg)
{
	if (!msg->user) {
		ipmi_smi_t    intf = msg->user_msg_data;

		/* Special handling for NULL users. */
		if (intf->null_user_handler) {
			intf->null_user_handler(intf, msg);
			ipmi_inc_stat(intf, handled_local_responses);
		} else {
			/* No handler, so give up. */
			ipmi_inc_stat(intf, unhandled_local_responses);
		}
		ipmi_free_recv_msg(msg);
	} else {
		ipmi_user_t user = msg->user;
		user->handler->ipmi_recv_hndl(msg, user->handler_data);
	}
}

static void
deliver_err_response(struct ipmi_recv_msg *msg, int err)
{
	msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
	msg->msg_data[0] = err;
	msg->msg.netfn |= 1; /* Convert to a response. */
	msg->msg.data_len = 1;
	msg->msg.data = msg->msg_data;
	deliver_response(msg);
}

/*
 * Find the next sequence number not being used and add the given
 * message with the given timeout to the sequence table.  This must be
 * called with the interface's seq_lock held.
 */
static int intf_next_seq(ipmi_smi_t           intf,
			 struct ipmi_recv_msg *recv_msg,
			 unsigned long        timeout,
			 int                  retries,
			 int                  broadcast,
			 unsigned char        *seq,
			 long                 *seqid)
{
	int          rv = 0;
	unsigned int i;

	for (i = intf->curr_seq; (i+1)%IPMI_IPMB_NUM_SEQ != intf->curr_seq;
					i = (i+1)%IPMI_IPMB_NUM_SEQ) {
		if (!intf->seq_table[i].inuse)
			break;
	}

	if (!intf->seq_table[i].inuse) {
		intf->seq_table[i].recv_msg = recv_msg;

		/*
		 * Start with the maximum timeout, when the send response
		 * comes in we will start the real timer.
		 */
		intf->seq_table[i].timeout = MAX_MSG_TIMEOUT;
		intf->seq_table[i].orig_timeout = timeout;
		intf->seq_table[i].retries_left = retries;
		intf->seq_table[i].broadcast = broadcast;
		intf->seq_table[i].inuse = 1;
		intf->seq_table[i].seqid = NEXT_SEQID(intf->seq_table[i].seqid);
		*seq = i;
		*seqid = intf->seq_table[i].seqid;
		intf->curr_seq = (i+1)%IPMI_IPMB_NUM_SEQ;
	} else {
		rv = -EAGAIN;
	}

	return rv;
}

/*
 * Return the receive message for the given sequence number and
 * release the sequence number so it can be reused.  Some other data
 * is passed in to be sure the message matches up correctly (to help
 * guard against message coming in after their timeout and the
 * sequence number being reused).
 */
static int intf_find_seq(ipmi_smi_t           intf,
			 unsigned char        seq,
			 short                channel,
			 unsigned char        cmd,
			 unsigned char        netfn,
			 struct ipmi_addr     *addr,
			 struct ipmi_recv_msg **recv_msg)
{
	int           rv = -ENODEV;
	unsigned long flags;

	if (seq >= IPMI_IPMB_NUM_SEQ)
		return -EINVAL;

	spin_lock_irqsave(&(intf->seq_lock), flags);
	if (intf->seq_table[seq].inuse) {
		struct ipmi_recv_msg *msg = intf->seq_table[seq].recv_msg;

		if ((msg->addr.channel == channel) && (msg->msg.cmd == cmd)
				&& (msg->msg.netfn == netfn)
				&& (ipmi_addr_equal(addr, &(msg->addr)))) {
			*recv_msg = msg;
			intf->seq_table[seq].inuse = 0;
			rv = 0;
		}
	}
	spin_unlock_irqrestore(&(intf->seq_lock), flags);

	return rv;
}


/* Start the timer for a specific sequence table entry. */
static int intf_start_seq_timer(ipmi_smi_t intf,
				long       msgid)
{
	int           rv = -ENODEV;
	unsigned long flags;
	unsigned char seq;
	unsigned long seqid;


	GET_SEQ_FROM_MSGID(msgid, seq, seqid);

	spin_lock_irqsave(&(intf->seq_lock), flags);
	/*
	 * We do this verification because the user can be deleted
	 * while a message is outstanding.
	 */
	if ((intf->seq_table[seq].inuse)
				&& (intf->seq_table[seq].seqid == seqid)) {
		struct seq_table *ent = &(intf->seq_table[seq]);
		ent->timeout = ent->orig_timeout;
		rv = 0;
	}
	spin_unlock_irqrestore(&(intf->seq_lock), flags);

	return rv;
}

/* Got an error for the send message for a specific sequence number. */
static int intf_err_seq(ipmi_smi_t   intf,
			long         msgid,
			unsigned int err)
{
	int                  rv = -ENODEV;
	unsigned long        flags;
	unsigned char        seq;
	unsigned long        seqid;
	struct ipmi_recv_msg *msg = NULL;


	GET_SEQ_FROM_MSGID(msgid, seq, seqid);

	spin_lock_irqsave(&(intf->seq_lock), flags);
	/*
	 * We do this verification because the user can be deleted
	 * while a message is outstanding.
	 */
	if ((intf->seq_table[seq].inuse)
				&& (intf->seq_table[seq].seqid == seqid)) {
		struct seq_table *ent = &(intf->seq_table[seq]);

		ent->inuse = 0;
		msg = ent->recv_msg;
		rv = 0;
	}
	spin_unlock_irqrestore(&(intf->seq_lock), flags);

	if (msg)
		deliver_err_response(msg, err);

	return rv;
}


int ipmi_create_user(unsigned int          if_num,
		     struct ipmi_user_hndl *handler,
		     void                  *handler_data,
		     ipmi_user_t           *user)
{
	unsigned long flags;
	ipmi_user_t   new_user;
	int           rv = 0;
	ipmi_smi_t    intf;

	/*
	 * There is no module usecount here, because it's not
	 * required.  Since this can only be used by and called from
	 * other modules, they will implicitly use this module, and
	 * thus this can't be removed unless the other modules are
	 * removed.
	 */

	if (handler == NULL)
		return -EINVAL;

	/*
	 * Make sure the driver is actually initialized, this handles
	 * problems with initialization order.
	 */
	if (!initialized) {
		rv = ipmi_init_msghandler();
		if (rv)
			return rv;

		/*
		 * The init code doesn't return an error if it was turned
		 * off, but it won't initialize.  Check that.
		 */
		if (!initialized)
			return -ENODEV;
	}

	new_user = kmalloc(sizeof(*new_user), GFP_KERNEL);
	if (!new_user)
		return -ENOMEM;

	mutex_lock(&ipmi_interfaces_mutex);
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		if (intf->intf_num == if_num)
			goto found;
	}
	/* Not found, return an error */
	rv = -EINVAL;
	goto out_kfree;

 found:
	/* Note that each existing user holds a refcount to the interface. */
	kref_get(&intf->refcount);

	kref_init(&new_user->refcount);
	new_user->handler = handler;
	new_user->handler_data = handler_data;
	new_user->intf = intf;
	new_user->gets_events = 0;

	if (!try_module_get(intf->handlers->owner)) {
		rv = -ENODEV;
		goto out_kref;
	}

	if (intf->handlers->inc_usecount) {
		rv = intf->handlers->inc_usecount(intf->send_info);
		if (rv) {
			module_put(intf->handlers->owner);
			goto out_kref;
		}
	}

	/*
	 * Hold the lock so intf->handlers is guaranteed to be good
	 * until now
	 */
	mutex_unlock(&ipmi_interfaces_mutex);

	new_user->valid = 1;
	spin_lock_irqsave(&intf->seq_lock, flags);
	list_add_rcu(&new_user->link, &intf->users);
	spin_unlock_irqrestore(&intf->seq_lock, flags);
	*user = new_user;
	return 0;

out_kref:
	kref_put(&intf->refcount, intf_free);
out_kfree:
	mutex_unlock(&ipmi_interfaces_mutex);
	kfree(new_user);
	return rv;
}
EXPORT_SYMBOL(ipmi_create_user);

int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data)
{
	int           rv = 0;
	ipmi_smi_t    intf;
	struct ipmi_smi_handlers *handlers;

	mutex_lock(&ipmi_interfaces_mutex);
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		if (intf->intf_num == if_num)
			goto found;
	}
	/* Not found, return an error */
	rv = -EINVAL;
	mutex_unlock(&ipmi_interfaces_mutex);
	return rv;

found:
	handlers = intf->handlers;
	rv = -ENOSYS;
	if (handlers->get_smi_info)
		rv = handlers->get_smi_info(intf->send_info, data);
	mutex_unlock(&ipmi_interfaces_mutex);

	return rv;
}
EXPORT_SYMBOL(ipmi_get_smi_info);

static void free_user(struct kref *ref)
{
	ipmi_user_t user = container_of(ref, struct ipmi_user, refcount);
	kfree(user);
}

int ipmi_destroy_user(ipmi_user_t user)
{
	ipmi_smi_t       intf = user->intf;
	int              i;
	unsigned long    flags;
	struct cmd_rcvr  *rcvr;
	struct cmd_rcvr  *rcvrs = NULL;

	user->valid = 0;

	/* Remove the user from the interface's sequence table. */
	spin_lock_irqsave(&intf->seq_lock, flags);
	list_del_rcu(&user->link);

	for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
		if (intf->seq_table[i].inuse
		    && (intf->seq_table[i].recv_msg->user == user)) {
			intf->seq_table[i].inuse = 0;
			ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
		}
	}
	spin_unlock_irqrestore(&intf->seq_lock, flags);

	/*
	 * Remove the user from the command receiver's table.  First
	 * we build a list of everything (not using the standard link,
	 * since other things may be using it till we do
	 * synchronize_rcu()) then free everything in that list.
	 */
	mutex_lock(&intf->cmd_rcvrs_mutex);
	list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
		if (rcvr->user == user) {
			list_del_rcu(&rcvr->link);
			rcvr->next = rcvrs;
			rcvrs = rcvr;
		}
	}
	mutex_unlock(&intf->cmd_rcvrs_mutex);
	synchronize_rcu();
	while (rcvrs) {
		rcvr = rcvrs;
		rcvrs = rcvr->next;
		kfree(rcvr);
	}

	mutex_lock(&ipmi_interfaces_mutex);
	if (intf->handlers) {
		module_put(intf->handlers->owner);
		if (intf->handlers->dec_usecount)
			intf->handlers->dec_usecount(intf->send_info);
	}
	mutex_unlock(&ipmi_interfaces_mutex);

	kref_put(&intf->refcount, intf_free);

	kref_put(&user->refcount, free_user);

	return 0;
}
EXPORT_SYMBOL(ipmi_destroy_user);

void ipmi_get_version(ipmi_user_t   user,
		      unsigned char *major,
		      unsigned char *minor)
{
	*major = user->intf->ipmi_version_major;
	*minor = user->intf->ipmi_version_minor;
}
EXPORT_SYMBOL(ipmi_get_version);

int ipmi_set_my_address(ipmi_user_t   user,
			unsigned int  channel,
			unsigned char address)
{
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	user->intf->channels[channel].address = address;
	return 0;
}
EXPORT_SYMBOL(ipmi_set_my_address);

int ipmi_get_my_address(ipmi_user_t   user,
			unsigned int  channel,
			unsigned char *address)
{
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	*address = user->intf->channels[channel].address;
	return 0;
}
EXPORT_SYMBOL(ipmi_get_my_address);

int ipmi_set_my_LUN(ipmi_user_t   user,
		    unsigned int  channel,
		    unsigned char LUN)
{
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	user->intf->channels[channel].lun = LUN & 0x3;
	return 0;
}
EXPORT_SYMBOL(ipmi_set_my_LUN);

int ipmi_get_my_LUN(ipmi_user_t   user,
		    unsigned int  channel,
		    unsigned char *address)
{
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	*address = user->intf->channels[channel].lun;
	return 0;
}
EXPORT_SYMBOL(ipmi_get_my_LUN);

int ipmi_get_maintenance_mode(ipmi_user_t user)
{
	int           mode;
	unsigned long flags;

	spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags);
	mode = user->intf->maintenance_mode;
	spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags);

	return mode;
}
EXPORT_SYMBOL(ipmi_get_maintenance_mode);

static void maintenance_mode_update(ipmi_smi_t intf)
{
	if (intf->handlers->set_maintenance_mode)
		intf->handlers->set_maintenance_mode(
			intf->send_info, intf->maintenance_mode_enable);
}

int ipmi_set_maintenance_mode(ipmi_user_t user, int mode)
{
	int           rv = 0;
	unsigned long flags;
	ipmi_smi_t    intf = user->intf;

	spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
	if (intf->maintenance_mode != mode) {
		switch (mode) {
		case IPMI_MAINTENANCE_MODE_AUTO:
			intf->maintenance_mode = mode;
			intf->maintenance_mode_enable
				= (intf->auto_maintenance_timeout > 0);
			break;

		case IPMI_MAINTENANCE_MODE_OFF:
			intf->maintenance_mode = mode;
			intf->maintenance_mode_enable = 0;
			break;

		case IPMI_MAINTENANCE_MODE_ON:
			intf->maintenance_mode = mode;
			intf->maintenance_mode_enable = 1;
			break;

		default:
			rv = -EINVAL;
			goto out_unlock;
		}

		maintenance_mode_update(intf);
	}
 out_unlock:
	spin_unlock_irqrestore(&intf->maintenance_mode_lock, flags);

	return rv;
}
EXPORT_SYMBOL(ipmi_set_maintenance_mode);

int ipmi_set_gets_events(ipmi_user_t user, int val)
{
	unsigned long        flags;
	ipmi_smi_t           intf = user->intf;
	struct ipmi_recv_msg *msg, *msg2;
	struct list_head     msgs;

	INIT_LIST_HEAD(&msgs);

	spin_lock_irqsave(&intf->events_lock, flags);
	user->gets_events = val;

	if (intf->delivering_events)
		/*
		 * Another thread is delivering events for this, so
		 * let it handle any new events.
		 */
		goto out;

	/* Deliver any queued events. */
	while (user->gets_events && !list_empty(&intf->waiting_events)) {
		list_for_each_entry_safe(msg, msg2, &intf->waiting_events, link)
			list_move_tail(&msg->link, &msgs);
		intf->waiting_events_count = 0;
		if (intf->event_msg_printed) {
			printk(KERN_WARNING PFX "Event queue no longer"
			       " full\n");
			intf->event_msg_printed = 0;
		}

		intf->delivering_events = 1;
		spin_unlock_irqrestore(&intf->events_lock, flags);

		list_for_each_entry_safe(msg, msg2, &msgs, link) {
			msg->user = user;
			kref_get(&user->refcount);
			deliver_response(msg);
		}

		spin_lock_irqsave(&intf->events_lock, flags);
		intf->delivering_events = 0;
	}

 out:
	spin_unlock_irqrestore(&intf->events_lock, flags);

	return 0;
}
EXPORT_SYMBOL(ipmi_set_gets_events);

static struct cmd_rcvr *find_cmd_rcvr(ipmi_smi_t    intf,
				      unsigned char netfn,
				      unsigned char cmd,
				      unsigned char chan)
{
	struct cmd_rcvr *rcvr;

	list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
		if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
					&& (rcvr->chans & (1 << chan)))
			return rcvr;
	}
	return NULL;
}

static int is_cmd_rcvr_exclusive(ipmi_smi_t    intf,
				 unsigned char netfn,
				 unsigned char cmd,
				 unsigned int  chans)
{
	struct cmd_rcvr *rcvr;

	list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
		if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
					&& (rcvr->chans & chans))
			return 0;
	}
	return 1;
}

int ipmi_register_for_cmd(ipmi_user_t   user,
			  unsigned char netfn,
			  unsigned char cmd,
			  unsigned int  chans)
{
	ipmi_smi_t      intf = user->intf;
	struct cmd_rcvr *rcvr;
	int             rv = 0;


	rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL);
	if (!rcvr)
		return -ENOMEM;
	rcvr->cmd = cmd;
	rcvr->netfn = netfn;
	rcvr->chans = chans;
	rcvr->user = user;

	mutex_lock(&intf->cmd_rcvrs_mutex);
	/* Make sure the command/netfn is not already registered. */
	if (!is_cmd_rcvr_exclusive(intf, netfn, cmd, chans)) {
		rv = -EBUSY;
		goto out_unlock;
	}

	list_add_rcu(&rcvr->link, &intf->cmd_rcvrs);

 out_unlock:
	mutex_unlock(&intf->cmd_rcvrs_mutex);
	if (rv)
		kfree(rcvr);

	return rv;
}
EXPORT_SYMBOL(ipmi_register_for_cmd);

int ipmi_unregister_for_cmd(ipmi_user_t   user,
			    unsigned char netfn,
			    unsigned char cmd,
			    unsigned int  chans)
{
	ipmi_smi_t      intf = user->intf;
	struct cmd_rcvr *rcvr;
	struct cmd_rcvr *rcvrs = NULL;
	int i, rv = -ENOENT;

	mutex_lock(&intf->cmd_rcvrs_mutex);
	for (i = 0; i < IPMI_NUM_CHANNELS; i++) {
		if (((1 << i) & chans) == 0)
			continue;
		rcvr = find_cmd_rcvr(intf, netfn, cmd, i);
		if (rcvr == NULL)
			continue;
		if (rcvr->user == user) {
			rv = 0;
			rcvr->chans &= ~chans;
			if (rcvr->chans == 0) {
				list_del_rcu(&rcvr->link);
				rcvr->next = rcvrs;
				rcvrs = rcvr;
			}
		}
	}
	mutex_unlock(&intf->cmd_rcvrs_mutex);
	synchronize_rcu();
	while (rcvrs) {
		rcvr = rcvrs;
		rcvrs = rcvr->next;
		kfree(rcvr);
	}
	return rv;
}
EXPORT_SYMBOL(ipmi_unregister_for_cmd);

static unsigned char
ipmb_checksum(unsigned char *data, int size)
{
	unsigned char csum = 0;

	for (; size > 0; size--, data++)
		csum += *data;

	return -csum;
}

static inline void format_ipmb_msg(struct ipmi_smi_msg   *smi_msg,
				   struct kernel_ipmi_msg *msg,
				   struct ipmi_ipmb_addr *ipmb_addr,
				   long                  msgid,
				   unsigned char         ipmb_seq,
				   int                   broadcast,
				   unsigned char         source_address,
				   unsigned char         source_lun)
{
	int i = broadcast;

	/* Format the IPMB header data. */
	smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
	smi_msg->data[1] = IPMI_SEND_MSG_CMD;
	smi_msg->data[2] = ipmb_addr->channel;
	if (broadcast)
		smi_msg->data[3] = 0;
	smi_msg->data[i+3] = ipmb_addr->slave_addr;
	smi_msg->data[i+4] = (msg->netfn << 2) | (ipmb_addr->lun & 0x3);
	smi_msg->data[i+5] = ipmb_checksum(&(smi_msg->data[i+3]), 2);
	smi_msg->data[i+6] = source_address;
	smi_msg->data[i+7] = (ipmb_seq << 2) | source_lun;
	smi_msg->data[i+8] = msg->cmd;

	/* Now tack on the data to the message. */
	if (msg->data_len > 0)
		memcpy(&(smi_msg->data[i+9]), msg->data,
		       msg->data_len);
	smi_msg->data_size = msg->data_len + 9;

	/* Now calculate the checksum and tack it on. */
	smi_msg->data[i+smi_msg->data_size]
		= ipmb_checksum(&(smi_msg->data[i+6]),
				smi_msg->data_size-6);

	/*
	 * Add on the checksum size and the offset from the
	 * broadcast.
	 */
	smi_msg->data_size += 1 + i;

	smi_msg->msgid = msgid;
}

static inline void format_lan_msg(struct ipmi_smi_msg   *smi_msg,
				  struct kernel_ipmi_msg *msg,
				  struct ipmi_lan_addr  *lan_addr,
				  long                  msgid,
				  unsigned char         ipmb_seq,
				  unsigned char         source_lun)
{
	/* Format the IPMB header data. */
	smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
	smi_msg->data[1] = IPMI_SEND_MSG_CMD;
	smi_msg->data[2] = lan_addr->channel;
	smi_msg->data[3] = lan_addr->session_handle;
	smi_msg->data[4] = lan_addr->remote_SWID;
	smi_msg->data[5] = (msg->netfn << 2) | (lan_addr->lun & 0x3);
	smi_msg->data[6] = ipmb_checksum(&(smi_msg->data[4]), 2);
	smi_msg->data[7] = lan_addr->local_SWID;
	smi_msg->data[8] = (ipmb_seq << 2) | source_lun;
	smi_msg->data[9] = msg->cmd;

	/* Now tack on the data to the message. */
	if (msg->data_len > 0)
		memcpy(&(smi_msg->data[10]), msg->data,
		       msg->data_len);
	smi_msg->data_size = msg->data_len + 10;

	/* Now calculate the checksum and tack it on. */
	smi_msg->data[smi_msg->data_size]
		= ipmb_checksum(&(smi_msg->data[7]),
				smi_msg->data_size-7);

	/*
	 * Add on the checksum size and the offset from the
	 * broadcast.
	 */
	smi_msg->data_size += 1;

	smi_msg->msgid = msgid;
}

/*
 * Separate from ipmi_request so that the user does not have to be
 * supplied in certain circumstances (mainly at panic time).  If
 * messages are supplied, they will be freed, even if an error
 * occurs.
 */
static int i_ipmi_request(ipmi_user_t          user,
			  ipmi_smi_t           intf,
			  struct ipmi_addr     *addr,
			  long                 msgid,
			  struct kernel_ipmi_msg *msg,
			  void                 *user_msg_data,
			  void                 *supplied_smi,
			  struct ipmi_recv_msg *supplied_recv,
			  int                  priority,
			  unsigned char        source_address,
			  unsigned char        source_lun,
			  int                  retries,
			  unsigned int         retry_time_ms)
{
	int                      rv = 0;
	struct ipmi_smi_msg      *smi_msg;
	struct ipmi_recv_msg     *recv_msg;
	unsigned long            flags;
	struct ipmi_smi_handlers *handlers;


	if (supplied_recv)
		recv_msg = supplied_recv;
	else {
		recv_msg = ipmi_alloc_recv_msg();
		if (recv_msg == NULL)
			return -ENOMEM;
	}
	recv_msg->user_msg_data = user_msg_data;

	if (supplied_smi)
		smi_msg = (struct ipmi_smi_msg *) supplied_smi;
	else {
		smi_msg = ipmi_alloc_smi_msg();
		if (smi_msg == NULL) {
			ipmi_free_recv_msg(recv_msg);
			return -ENOMEM;
		}
	}

	rcu_read_lock();
	handlers = intf->handlers;
	if (!handlers) {
		rv = -ENODEV;
		goto out_err;
	}

	recv_msg->user = user;
	if (user)
		kref_get(&user->refcount);
	recv_msg->msgid = msgid;
	/*
	 * Store the message to send in the receive message so timeout
	 * responses can get the proper response data.
	 */
	recv_msg->msg = *msg;

	if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
		struct ipmi_system_interface_addr *smi_addr;

		if (msg->netfn & 1) {
			/* Responses are not allowed to the SMI. */
			rv = -EINVAL;
			goto out_err;
		}

		smi_addr = (struct ipmi_system_interface_addr *) addr;
		if (smi_addr->lun > 3) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		memcpy(&recv_msg->addr, smi_addr, sizeof(*smi_addr));

		if ((msg->netfn == IPMI_NETFN_APP_REQUEST)
		    && ((msg->cmd == IPMI_SEND_MSG_CMD)
			|| (msg->cmd == IPMI_GET_MSG_CMD)
			|| (msg->cmd == IPMI_READ_EVENT_MSG_BUFFER_CMD))) {
			/*
			 * We don't let the user do these, since we manage
			 * the sequence numbers.
			 */
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		if (((msg->netfn == IPMI_NETFN_APP_REQUEST)
		      && ((msg->cmd == IPMI_COLD_RESET_CMD)
			  || (msg->cmd == IPMI_WARM_RESET_CMD)))
		     || (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST)) {
			spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
			intf->auto_maintenance_timeout
				= IPMI_MAINTENANCE_MODE_TIMEOUT;
			if (!intf->maintenance_mode
			    && !intf->maintenance_mode_enable) {
				intf->maintenance_mode_enable = 1;
				maintenance_mode_update(intf);
			}
			spin_unlock_irqrestore(&intf->maintenance_mode_lock,
					       flags);
		}

		if ((msg->data_len + 2) > IPMI_MAX_MSG_LENGTH) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EMSGSIZE;
			goto out_err;
		}

		smi_msg->data[0] = (msg->netfn << 2) | (smi_addr->lun & 0x3);
		smi_msg->data[1] = msg->cmd;
		smi_msg->msgid = msgid;
		smi_msg->user_data = recv_msg;
		if (msg->data_len > 0)
			memcpy(&(smi_msg->data[2]), msg->data, msg->data_len);
		smi_msg->data_size = msg->data_len + 2;
		ipmi_inc_stat(intf, sent_local_commands);
	} else if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
		struct ipmi_ipmb_addr *ipmb_addr;
		unsigned char         ipmb_seq;
		long                  seqid;
		int                   broadcast = 0;

		if (addr->channel >= IPMI_MAX_CHANNELS) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		if (intf->channels[addr->channel].medium
					!= IPMI_CHANNEL_MEDIUM_IPMB) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		if (retries < 0) {
		    if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)
			retries = 0; /* Don't retry broadcasts. */
		    else
			retries = 4;
		}
		if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) {
		    /*
		     * Broadcasts add a zero at the beginning of the
		     * message, but otherwise is the same as an IPMB
		     * address.
		     */
		    addr->addr_type = IPMI_IPMB_ADDR_TYPE;
		    broadcast = 1;
		}


		/* Default to 1 second retries. */
		if (retry_time_ms == 0)
		    retry_time_ms = 1000;

		/*
		 * 9 for the header and 1 for the checksum, plus
		 * possibly one for the broadcast.
		 */
		if ((msg->data_len + 10 + broadcast) > IPMI_MAX_MSG_LENGTH) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EMSGSIZE;
			goto out_err;
		}

		ipmb_addr = (struct ipmi_ipmb_addr *) addr;
		if (ipmb_addr->lun > 3) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		memcpy(&recv_msg->addr, ipmb_addr, sizeof(*ipmb_addr));

		if (recv_msg->msg.netfn & 0x1) {
			/*
			 * It's a response, so use the user's sequence
			 * from msgid.
			 */
			ipmi_inc_stat(intf, sent_ipmb_responses);
			format_ipmb_msg(smi_msg, msg, ipmb_addr, msgid,
					msgid, broadcast,
					source_address, source_lun);

			/*
			 * Save the receive message so we can use it
			 * to deliver the response.
			 */
			smi_msg->user_data = recv_msg;
		} else {
			/* It's a command, so get a sequence for it. */

			spin_lock_irqsave(&(intf->seq_lock), flags);

			/*
			 * Create a sequence number with a 1 second
			 * timeout and 4 retries.
			 */
			rv = intf_next_seq(intf,
					   recv_msg,
					   retry_time_ms,
					   retries,
					   broadcast,
					   &ipmb_seq,
					   &seqid);
			if (rv) {
				/*
				 * We have used up all the sequence numbers,
				 * probably, so abort.
				 */
				spin_unlock_irqrestore(&(intf->seq_lock),
						       flags);
				goto out_err;
			}

			ipmi_inc_stat(intf, sent_ipmb_commands);

			/*
			 * Store the sequence number in the message,
			 * so that when the send message response
			 * comes back we can start the timer.
			 */
			format_ipmb_msg(smi_msg, msg, ipmb_addr,
					STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
					ipmb_seq, broadcast,
					source_address, source_lun);

			/*
			 * Copy the message into the recv message data, so we
			 * can retransmit it later if necessary.
			 */
			memcpy(recv_msg->msg_data, smi_msg->data,
			       smi_msg->data_size);
			recv_msg->msg.data = recv_msg->msg_data;
			recv_msg->msg.data_len = smi_msg->data_size;

			/*
			 * We don't unlock until here, because we need
			 * to copy the completed message into the
			 * recv_msg before we release the lock.
			 * Otherwise, race conditions may bite us.  I
			 * know that's pretty paranoid, but I prefer
			 * to be correct.
			 */
			spin_unlock_irqrestore(&(intf->seq_lock), flags);
		}
	} else if (is_lan_addr(addr)) {
		struct ipmi_lan_addr  *lan_addr;
		unsigned char         ipmb_seq;
		long                  seqid;

		if (addr->channel >= IPMI_MAX_CHANNELS) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		if ((intf->channels[addr->channel].medium
				!= IPMI_CHANNEL_MEDIUM_8023LAN)
		    && (intf->channels[addr->channel].medium
				!= IPMI_CHANNEL_MEDIUM_ASYNC)) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		retries = 4;

		/* Default to 1 second retries. */
		if (retry_time_ms == 0)
		    retry_time_ms = 1000;

		/* 11 for the header and 1 for the checksum. */
		if ((msg->data_len + 12) > IPMI_MAX_MSG_LENGTH) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EMSGSIZE;
			goto out_err;
		}

		lan_addr = (struct ipmi_lan_addr *) addr;
		if (lan_addr->lun > 3) {
			ipmi_inc_stat(intf, sent_invalid_commands);
			rv = -EINVAL;
			goto out_err;
		}

		memcpy(&recv_msg->addr, lan_addr, sizeof(*lan_addr));

		if (recv_msg->msg.netfn & 0x1) {
			/*
			 * It's a response, so use the user's sequence
			 * from msgid.
			 */
			ipmi_inc_stat(intf, sent_lan_responses);
			format_lan_msg(smi_msg, msg, lan_addr, msgid,
				       msgid, source_lun);

			/*
			 * Save the receive message so we can use it
			 * to deliver the response.
			 */
			smi_msg->user_data = recv_msg;
		} else {
			/* It's a command, so get a sequence for it. */

			spin_lock_irqsave(&(intf->seq_lock), flags);

			/*
			 * Create a sequence number with a 1 second
			 * timeout and 4 retries.
			 */
			rv = intf_next_seq(intf,
					   recv_msg,
					   retry_time_ms,
					   retries,
					   0,
					   &ipmb_seq,
					   &seqid);
			if (rv) {
				/*
				 * We have used up all the sequence numbers,
				 * probably, so abort.
				 */
				spin_unlock_irqrestore(&(intf->seq_lock),
						       flags);
				goto out_err;
			}

			ipmi_inc_stat(intf, sent_lan_commands);

			/*
			 * Store the sequence number in the message,
			 * so that when the send message response
			 * comes back we can start the timer.
			 */
			format_lan_msg(smi_msg, msg, lan_addr,
				       STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
				       ipmb_seq, source_lun);

			/*
			 * Copy the message into the recv message data, so we
			 * can retransmit it later if necessary.
			 */
			memcpy(recv_msg->msg_data, smi_msg->data,
			       smi_msg->data_size);
			recv_msg->msg.data = recv_msg->msg_data;
			recv_msg->msg.data_len = smi_msg->data_size;

			/*
			 * We don't unlock until here, because we need
			 * to copy the completed message into the
			 * recv_msg before we release the lock.
			 * Otherwise, race conditions may bite us.  I
			 * know that's pretty paranoid, but I prefer
			 * to be correct.
			 */
			spin_unlock_irqrestore(&(intf->seq_lock), flags);
		}
	} else {
	    /* Unknown address type. */
		ipmi_inc_stat(intf, sent_invalid_commands);
		rv = -EINVAL;
		goto out_err;
	}

#ifdef DEBUG_MSGING
	{
		int m;
		for (m = 0; m < smi_msg->data_size; m++)
			printk(" %2.2x", smi_msg->data[m]);
		printk("\n");
	}
#endif

	handlers->sender(intf->send_info, smi_msg, priority);
	rcu_read_unlock();

	return 0;

 out_err:
	rcu_read_unlock();
	ipmi_free_smi_msg(smi_msg);
	ipmi_free_recv_msg(recv_msg);
	return rv;
}

static int check_addr(ipmi_smi_t       intf,
		      struct ipmi_addr *addr,
		      unsigned char    *saddr,
		      unsigned char    *lun)
{
	if (addr->channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	*lun = intf->channels[addr->channel].lun;
	*saddr = intf->channels[addr->channel].address;
	return 0;
}

int ipmi_request_settime(ipmi_user_t      user,
			 struct ipmi_addr *addr,
			 long             msgid,
			 struct kernel_ipmi_msg  *msg,
			 void             *user_msg_data,
			 int              priority,
			 int              retries,
			 unsigned int     retry_time_ms)
{
	unsigned char saddr = 0, lun = 0;
	int           rv;

	if (!user)
		return -EINVAL;
	rv = check_addr(user->intf, addr, &saddr, &lun);
	if (rv)
		return rv;
	return i_ipmi_request(user,
			      user->intf,
			      addr,
			      msgid,
			      msg,
			      user_msg_data,
			      NULL, NULL,
			      priority,
			      saddr,
			      lun,
			      retries,
			      retry_time_ms);
}
EXPORT_SYMBOL(ipmi_request_settime);

int ipmi_request_supply_msgs(ipmi_user_t          user,
			     struct ipmi_addr     *addr,
			     long                 msgid,
			     struct kernel_ipmi_msg *msg,
			     void                 *user_msg_data,
			     void                 *supplied_smi,
			     struct ipmi_recv_msg *supplied_recv,
			     int                  priority)
{
	unsigned char saddr = 0, lun = 0;
	int           rv;

	if (!user)
		return -EINVAL;
	rv = check_addr(user->intf, addr, &saddr, &lun);
	if (rv)
		return rv;
	return i_ipmi_request(user,
			      user->intf,
			      addr,
			      msgid,
			      msg,
			      user_msg_data,
			      supplied_smi,
			      supplied_recv,
			      priority,
			      saddr,
			      lun,
			      -1, 0);
}
EXPORT_SYMBOL(ipmi_request_supply_msgs);

#ifdef CONFIG_PROC_FS
static int smi_ipmb_proc_show(struct seq_file *m, void *v)
{
	ipmi_smi_t intf = m->private;
	int        i;

	seq_printf(m, "%x", intf->channels[0].address);
	for (i = 1; i < IPMI_MAX_CHANNELS; i++)
		seq_printf(m, " %x", intf->channels[i].address);
	return seq_putc(m, '\n');
}

static int smi_ipmb_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, smi_ipmb_proc_show, PDE_DATA(inode));
}

static const struct file_operations smi_ipmb_proc_ops = {
	.open		= smi_ipmb_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int smi_version_proc_show(struct seq_file *m, void *v)
{
	ipmi_smi_t intf = m->private;

	return seq_printf(m, "%u.%u\n",
		       ipmi_version_major(&intf->bmc->id),
		       ipmi_version_minor(&intf->bmc->id));
}

static int smi_version_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, smi_version_proc_show, PDE_DATA(inode));
}

static const struct file_operations smi_version_proc_ops = {
	.open		= smi_version_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int smi_stats_proc_show(struct seq_file *m, void *v)
{
	ipmi_smi_t intf = m->private;

	seq_printf(m, "sent_invalid_commands:       %u\n",
		       ipmi_get_stat(intf, sent_invalid_commands));
	seq_printf(m, "sent_local_commands:         %u\n",
		       ipmi_get_stat(intf, sent_local_commands));
	seq_printf(m, "handled_local_responses:     %u\n",
		       ipmi_get_stat(intf, handled_local_responses));
	seq_printf(m, "unhandled_local_responses:   %u\n",
		       ipmi_get_stat(intf, unhandled_local_responses));
	seq_printf(m, "sent_ipmb_commands:          %u\n",
		       ipmi_get_stat(intf, sent_ipmb_commands));
	seq_printf(m, "sent_ipmb_command_errs:      %u\n",
		       ipmi_get_stat(intf, sent_ipmb_command_errs));
	seq_printf(m, "retransmitted_ipmb_commands: %u\n",
		       ipmi_get_stat(intf, retransmitted_ipmb_commands));
	seq_printf(m, "timed_out_ipmb_commands:     %u\n",
		       ipmi_get_stat(intf, timed_out_ipmb_commands));
	seq_printf(m, "timed_out_ipmb_broadcasts:   %u\n",
		       ipmi_get_stat(intf, timed_out_ipmb_broadcasts));
	seq_printf(m, "sent_ipmb_responses:         %u\n",
		       ipmi_get_stat(intf, sent_ipmb_responses));
	seq_printf(m, "handled_ipmb_responses:      %u\n",
		       ipmi_get_stat(intf, handled_ipmb_responses));
	seq_printf(m, "invalid_ipmb_responses:      %u\n",
		       ipmi_get_stat(intf, invalid_ipmb_responses));
	seq_printf(m, "unhandled_ipmb_responses:    %u\n",
		       ipmi_get_stat(intf, unhandled_ipmb_responses));
	seq_printf(m, "sent_lan_commands:           %u\n",
		       ipmi_get_stat(intf, sent_lan_commands));
	seq_printf(m, "sent_lan_command_errs:       %u\n",
		       ipmi_get_stat(intf, sent_lan_command_errs));
	seq_printf(m, "retransmitted_lan_commands:  %u\n",
		       ipmi_get_stat(intf, retransmitted_lan_commands));
	seq_printf(m, "timed_out_lan_commands:      %u\n",
		       ipmi_get_stat(intf, timed_out_lan_commands));
	seq_printf(m, "sent_lan_responses:          %u\n",
		       ipmi_get_stat(intf, sent_lan_responses));
	seq_printf(m, "handled_lan_responses:       %u\n",
		       ipmi_get_stat(intf, handled_lan_responses));
	seq_printf(m, "invalid_lan_responses:       %u\n",
		       ipmi_get_stat(intf, invalid_lan_responses));
	seq_printf(m, "unhandled_lan_responses:     %u\n",
		       ipmi_get_stat(intf, unhandled_lan_responses));
	seq_printf(m, "handled_commands:            %u\n",
		       ipmi_get_stat(intf, handled_commands));
	seq_printf(m, "invalid_commands:            %u\n",
		       ipmi_get_stat(intf, invalid_commands));
	seq_printf(m, "unhandled_commands:          %u\n",
		       ipmi_get_stat(intf, unhandled_commands));
	seq_printf(m, "invalid_events:              %u\n",
		       ipmi_get_stat(intf, invalid_events));
	seq_printf(m, "events:                      %u\n",
		       ipmi_get_stat(intf, events));
	seq_printf(m, "failed rexmit LAN msgs:      %u\n",
		       ipmi_get_stat(intf, dropped_rexmit_lan_commands));
	seq_printf(m, "failed rexmit IPMB msgs:     %u\n",
		       ipmi_get_stat(intf, dropped_rexmit_ipmb_commands));
	return 0;
}

static int smi_stats_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
}

static const struct file_operations smi_stats_proc_ops = {
	.open		= smi_stats_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
#endif /* CONFIG_PROC_FS */

int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
			    const struct file_operations *proc_ops,
			    void *data)
{
	int                    rv = 0;
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry  *file;
	struct ipmi_proc_entry *entry;

	/* Create a list element. */
	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;
	entry->name = kstrdup(name, GFP_KERNEL);
	if (!entry->name) {
		kfree(entry);
		return -ENOMEM;
	}

	file = proc_create_data(name, 0, smi->proc_dir, proc_ops, data);
	if (!file) {
		kfree(entry->name);
		kfree(entry);
		rv = -ENOMEM;
	} else {
		mutex_lock(&smi->proc_entry_lock);
		/* Stick it on the list. */
		entry->next = smi->proc_entries;
		smi->proc_entries = entry;
		mutex_unlock(&smi->proc_entry_lock);
	}
#endif /* CONFIG_PROC_FS */

	return rv;
}
EXPORT_SYMBOL(ipmi_smi_add_proc_entry);

static int add_proc_entries(ipmi_smi_t smi, int num)
{
	int rv = 0;

#ifdef CONFIG_PROC_FS
	sprintf(smi->proc_dir_name, "%d", num);
	smi->proc_dir = proc_mkdir(smi->proc_dir_name, proc_ipmi_root);
	if (!smi->proc_dir)
		rv = -ENOMEM;

	if (rv == 0)
		rv = ipmi_smi_add_proc_entry(smi, "stats",
					     &smi_stats_proc_ops,
					     smi);

	if (rv == 0)
		rv = ipmi_smi_add_proc_entry(smi, "ipmb",
					     &smi_ipmb_proc_ops,
					     smi);

	if (rv == 0)
		rv = ipmi_smi_add_proc_entry(smi, "version",
					     &smi_version_proc_ops,
					     smi);
#endif /* CONFIG_PROC_FS */

	return rv;
}

static void remove_proc_entries(ipmi_smi_t smi)
{
#ifdef CONFIG_PROC_FS
	struct ipmi_proc_entry *entry;

	mutex_lock(&smi->proc_entry_lock);
	while (smi->proc_entries) {
		entry = smi->proc_entries;
		smi->proc_entries = entry->next;

		remove_proc_entry(entry->name, smi->proc_dir);
		kfree(entry->name);
		kfree(entry);
	}
	mutex_unlock(&smi->proc_entry_lock);
	remove_proc_entry(smi->proc_dir_name, proc_ipmi_root);
#endif /* CONFIG_PROC_FS */
}

static int __find_bmc_guid(struct device *dev, void *data)
{
	unsigned char *id = data;
	struct bmc_device *bmc = dev_get_drvdata(dev);
	return memcmp(bmc->guid, id, 16) == 0;
}

static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv,
					     unsigned char *guid)
{
	struct device *dev;

	dev = driver_find_device(drv, NULL, guid, __find_bmc_guid);
	if (dev)
		return dev_get_drvdata(dev);
	else
		return NULL;
}

struct prod_dev_id {
	unsigned int  product_id;
	unsigned char device_id;
};

static int __find_bmc_prod_dev_id(struct device *dev, void *data)
{
	struct prod_dev_id *id = data;
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return (bmc->id.product_id == id->product_id
		&& bmc->id.device_id == id->device_id);
}

static struct bmc_device *ipmi_find_bmc_prod_dev_id(
	struct device_driver *drv,
	unsigned int product_id, unsigned char device_id)
{
	struct prod_dev_id id = {
		.product_id = product_id,
		.device_id = device_id,
	};
	struct device *dev;

	dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id);
	if (dev)
		return dev_get_drvdata(dev);
	else
		return NULL;
}

static ssize_t device_id_show(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 10, "%u\n", bmc->id.device_id);
}

static ssize_t provides_dev_sdrs_show(struct device *dev,
				      struct device_attribute *attr,
				      char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 10, "%u\n",
			(bmc->id.device_revision & 0x80) >> 7);
}

static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 20, "%u\n",
			bmc->id.device_revision & 0x0F);
}

static ssize_t firmware_rev_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 20, "%u.%x\n", bmc->id.firmware_revision_1,
			bmc->id.firmware_revision_2);
}

static ssize_t ipmi_version_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 20, "%u.%u\n",
			ipmi_version_major(&bmc->id),
			ipmi_version_minor(&bmc->id));
}

static ssize_t add_dev_support_show(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 10, "0x%02x\n",
			bmc->id.additional_device_support);
}

static ssize_t manufacturer_id_show(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 20, "0x%6.6x\n", bmc->id.manufacturer_id);
}

static ssize_t product_id_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 10, "0x%4.4x\n", bmc->id.product_id);
}

static ssize_t aux_firmware_rev_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 21, "0x%02x 0x%02x 0x%02x 0x%02x\n",
			bmc->id.aux_firmware_revision[3],
			bmc->id.aux_firmware_revision[2],
			bmc->id.aux_firmware_revision[1],
			bmc->id.aux_firmware_revision[0]);
}

static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct bmc_device *bmc = dev_get_drvdata(dev);

	return snprintf(buf, 100, "%Lx%Lx\n",
			(long long) bmc->guid[0],
			(long long) bmc->guid[8]);
}

static void remove_files(struct bmc_device *bmc)
{
	if (!bmc->dev)
		return;

	device_remove_file(&bmc->dev->dev,
			   &bmc->device_id_attr);
	device_remove_file(&bmc->dev->dev,
			   &bmc->provides_dev_sdrs_attr);
	device_remove_file(&bmc->dev->dev,
			   &bmc->revision_attr);
	device_remove_file(&bmc->dev->dev,
			   &bmc->firmware_rev_attr);
	device_remove_file(&bmc->dev->dev,
			   &bmc->version_attr);
	device_remove_file(&bmc->dev->dev,
			   &bmc->add_dev_support_attr);
	device_remove_file(&bmc->dev->dev,
			   &bmc->manufacturer_id_attr);
	device_remove_file(&bmc->dev->dev,
			   &bmc->product_id_attr);

	if (bmc->id.aux_firmware_revision_set)
		device_remove_file(&bmc->dev->dev,
				   &bmc->aux_firmware_rev_attr);
	if (bmc->guid_set)
		device_remove_file(&bmc->dev->dev,
				   &bmc->guid_attr);
}

static void
cleanup_bmc_device(struct kref *ref)
{
	struct bmc_device *bmc;

	bmc = container_of(ref, struct bmc_device, refcount);

	remove_files(bmc);
	platform_device_unregister(bmc->dev);
	kfree(bmc);
}

static void ipmi_bmc_unregister(ipmi_smi_t intf)
{
	struct bmc_device *bmc = intf->bmc;

	if (intf->sysfs_name) {
		sysfs_remove_link(&intf->si_dev->kobj, intf->sysfs_name);
		kfree(intf->sysfs_name);
		intf->sysfs_name = NULL;
	}
	if (intf->my_dev_name) {
		sysfs_remove_link(&bmc->dev->dev.kobj, intf->my_dev_name);
		kfree(intf->my_dev_name);
		intf->my_dev_name = NULL;
	}

	mutex_lock(&ipmidriver_mutex);
	kref_put(&bmc->refcount, cleanup_bmc_device);
	intf->bmc = NULL;
	mutex_unlock(&ipmidriver_mutex);
}

static int create_files(struct bmc_device *bmc)
{
	int err;

	bmc->device_id_attr.attr.name = "device_id";
	bmc->device_id_attr.attr.mode = S_IRUGO;
	bmc->device_id_attr.show = device_id_show;
	sysfs_attr_init(&bmc->device_id_attr.attr);

	bmc->provides_dev_sdrs_attr.attr.name = "provides_device_sdrs";
	bmc->provides_dev_sdrs_attr.attr.mode = S_IRUGO;
	bmc->provides_dev_sdrs_attr.show = provides_dev_sdrs_show;
	sysfs_attr_init(&bmc->provides_dev_sdrs_attr.attr);

	bmc->revision_attr.attr.name = "revision";
	bmc->revision_attr.attr.mode = S_IRUGO;
	bmc->revision_attr.show = revision_show;
	sysfs_attr_init(&bmc->revision_attr.attr);

	bmc->firmware_rev_attr.attr.name = "firmware_revision";
	bmc->firmware_rev_attr.attr.mode = S_IRUGO;
	bmc->firmware_rev_attr.show = firmware_rev_show;
	sysfs_attr_init(&bmc->firmware_rev_attr.attr);

	bmc->version_attr.attr.name = "ipmi_version";
	bmc->version_attr.attr.mode = S_IRUGO;
	bmc->version_attr.show = ipmi_version_show;
	sysfs_attr_init(&bmc->version_attr.attr);

	bmc->add_dev_support_attr.attr.name = "additional_device_support";
	bmc->add_dev_support_attr.attr.mode = S_IRUGO;
	bmc->add_dev_support_attr.show = add_dev_support_show;
	sysfs_attr_init(&bmc->add_dev_support_attr.attr);

	bmc->manufacturer_id_attr.attr.name = "manufacturer_id";
	bmc->manufacturer_id_attr.attr.mode = S_IRUGO;
	bmc->manufacturer_id_attr.show = manufacturer_id_show;
	sysfs_attr_init(&bmc->manufacturer_id_attr.attr);

	bmc->product_id_attr.attr.name = "product_id";
	bmc->product_id_attr.attr.mode = S_IRUGO;
	bmc->product_id_attr.show = product_id_show;
	sysfs_attr_init(&bmc->product_id_attr.attr);

	bmc->guid_attr.attr.name = "guid";
	bmc->guid_attr.attr.mode = S_IRUGO;
	bmc->guid_attr.show = guid_show;
	sysfs_attr_init(&bmc->guid_attr.attr);

	bmc->aux_firmware_rev_attr.attr.name = "aux_firmware_revision";
	bmc->aux_firmware_rev_attr.attr.mode = S_IRUGO;
	bmc->aux_firmware_rev_attr.show = aux_firmware_rev_show;
	sysfs_attr_init(&bmc->aux_firmware_rev_attr.attr);

	err = device_create_file(&bmc->dev->dev,
			   &bmc->device_id_attr);
	if (err)
		goto out;
	err = device_create_file(&bmc->dev->dev,
			   &bmc->provides_dev_sdrs_attr);
	if (err)
		goto out_devid;
	err = device_create_file(&bmc->dev->dev,
			   &bmc->revision_attr);
	if (err)
		goto out_sdrs;
	err = device_create_file(&bmc->dev->dev,
			   &bmc->firmware_rev_attr);
	if (err)
		goto out_rev;
	err = device_create_file(&bmc->dev->dev,
			   &bmc->version_attr);
	if (err)
		goto out_firm;
	err = device_create_file(&bmc->dev->dev,
			   &bmc->add_dev_support_attr);
	if (err)
		goto out_version;
	err = device_create_file(&bmc->dev->dev,
			   &bmc->manufacturer_id_attr);
	if (err)
		goto out_add_dev;
	err = device_create_file(&bmc->dev->dev,
			   &bmc->product_id_attr);
	if (err)
		goto out_manu;
	if (bmc->id.aux_firmware_revision_set) {
		err = device_create_file(&bmc->dev->dev,
				   &bmc->aux_firmware_rev_attr);
		if (err)
			goto out_prod_id;
	}
	if (bmc->guid_set) {
		err = device_create_file(&bmc->dev->dev,
				   &bmc->guid_attr);
		if (err)
			goto out_aux_firm;
	}

	return 0;

out_aux_firm:
	if (bmc->id.aux_firmware_revision_set)
		device_remove_file(&bmc->dev->dev,
				   &bmc->aux_firmware_rev_attr);
out_prod_id:
	device_remove_file(&bmc->dev->dev,
			   &bmc->product_id_attr);
out_manu:
	device_remove_file(&bmc->dev->dev,
			   &bmc->manufacturer_id_attr);
out_add_dev:
	device_remove_file(&bmc->dev->dev,
			   &bmc->add_dev_support_attr);
out_version:
	device_remove_file(&bmc->dev->dev,
			   &bmc->version_attr);
out_firm:
	device_remove_file(&bmc->dev->dev,
			   &bmc->firmware_rev_attr);
out_rev:
	device_remove_file(&bmc->dev->dev,
			   &bmc->revision_attr);
out_sdrs:
	device_remove_file(&bmc->dev->dev,
			   &bmc->provides_dev_sdrs_attr);
out_devid:
	device_remove_file(&bmc->dev->dev,
			   &bmc->device_id_attr);
out:
	return err;
}

static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum,
			     const char *sysfs_name)
{
	int               rv;
	struct bmc_device *bmc = intf->bmc;
	struct bmc_device *old_bmc;
	int               size;
	char              dummy[1];

	mutex_lock(&ipmidriver_mutex);

	/*
	 * Try to find if there is an bmc_device struct
	 * representing the interfaced BMC already
	 */
	if (bmc->guid_set)
		old_bmc = ipmi_find_bmc_guid(&ipmidriver.driver, bmc->guid);
	else
		old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
						    bmc->id.product_id,
						    bmc->id.device_id);

	/*
	 * If there is already an bmc_device, free the new one,
	 * otherwise register the new BMC device
	 */
	if (old_bmc) {
		kfree(bmc);
		intf->bmc = old_bmc;
		bmc = old_bmc;

		kref_get(&bmc->refcount);
		mutex_unlock(&ipmidriver_mutex);

		printk(KERN_INFO
		       "ipmi: interfacing existing BMC (man_id: 0x%6.6x,"
		       " prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
		       bmc->id.manufacturer_id,
		       bmc->id.product_id,
		       bmc->id.device_id);
	} else {
		char name[14];
		unsigned char orig_dev_id = bmc->id.device_id;
		int warn_printed = 0;

		snprintf(name, sizeof(name),
			 "ipmi_bmc.%4.4x", bmc->id.product_id);

		while (ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
						 bmc->id.product_id,
						 bmc->id.device_id)) {
			if (!warn_printed) {
				printk(KERN_WARNING PFX
				       "This machine has two different BMCs"
				       " with the same product id and device"
				       " id.  This is an error in the"
				       " firmware, but incrementing the"
				       " device id to work around the problem."
				       " Prod ID = 0x%x, Dev ID = 0x%x\n",
				       bmc->id.product_id, bmc->id.device_id);
				warn_printed = 1;
			}
			bmc->id.device_id++; /* Wraps at 255 */
			if (bmc->id.device_id == orig_dev_id) {
				printk(KERN_ERR PFX
				       "Out of device ids!\n");
				break;
			}
		}

		bmc->dev = platform_device_alloc(name, bmc->id.device_id);
		if (!bmc->dev) {
			mutex_unlock(&ipmidriver_mutex);
			printk(KERN_ERR
			       "ipmi_msghandler:"
			       " Unable to allocate platform device\n");
			return -ENOMEM;
		}
		bmc->dev->dev.driver = &ipmidriver.driver;
		dev_set_drvdata(&bmc->dev->dev, bmc);
		kref_init(&bmc->refcount);

		rv = platform_device_add(bmc->dev);
		mutex_unlock(&ipmidriver_mutex);
		if (rv) {
			platform_device_put(bmc->dev);
			bmc->dev = NULL;
			printk(KERN_ERR
			       "ipmi_msghandler:"
			       " Unable to register bmc device: %d\n",
			       rv);
			/*
			 * Don't go to out_err, you can only do that if
			 * the device is registered already.
			 */
			return rv;
		}

		rv = create_files(bmc);
		if (rv) {
			mutex_lock(&ipmidriver_mutex);
			platform_device_unregister(bmc->dev);
			mutex_unlock(&ipmidriver_mutex);

			return rv;
		}

		dev_info(intf->si_dev, "Found new BMC (man_id: 0x%6.6x, "
			 "prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
			 bmc->id.manufacturer_id,
			 bmc->id.product_id,
			 bmc->id.device_id);
	}

	/*
	 * create symlink from system interface device to bmc device
	 * and back.
	 */
	intf->sysfs_name = kstrdup(sysfs_name, GFP_KERNEL);
	if (!intf->sysfs_name) {
		rv = -ENOMEM;
		printk(KERN_ERR
		       "ipmi_msghandler: allocate link to BMC: %d\n",
		       rv);
		goto out_err;
	}

	rv = sysfs_create_link(&intf->si_dev->kobj,
			       &bmc->dev->dev.kobj, intf->sysfs_name);
	if (rv) {
		kfree(intf->sysfs_name);
		intf->sysfs_name = NULL;
		printk(KERN_ERR
		       "ipmi_msghandler: Unable to create bmc symlink: %d\n",
		       rv);
		goto out_err;
	}

	size = snprintf(dummy, 0, "ipmi%d", ifnum);
	intf->my_dev_name = kmalloc(size+1, GFP_KERNEL);
	if (!intf->my_dev_name) {
		kfree(intf->sysfs_name);
		intf->sysfs_name = NULL;
		rv = -ENOMEM;
		printk(KERN_ERR
		       "ipmi_msghandler: allocate link from BMC: %d\n",
		       rv);
		goto out_err;
	}
	snprintf(intf->my_dev_name, size+1, "ipmi%d", ifnum);

	rv = sysfs_create_link(&bmc->dev->dev.kobj, &intf->si_dev->kobj,
			       intf->my_dev_name);
	if (rv) {
		kfree(intf->sysfs_name);
		intf->sysfs_name = NULL;
		kfree(intf->my_dev_name);
		intf->my_dev_name = NULL;
		printk(KERN_ERR
		       "ipmi_msghandler:"
		       " Unable to create symlink to bmc: %d\n",
		       rv);
		goto out_err;
	}

	return 0;

out_err:
	ipmi_bmc_unregister(intf);
	return rv;
}

static int
send_guid_cmd(ipmi_smi_t intf, int chan)
{
	struct kernel_ipmi_msg            msg;
	struct ipmi_system_interface_addr si;

	si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	si.channel = IPMI_BMC_CHANNEL;
	si.lun = 0;

	msg.netfn = IPMI_NETFN_APP_REQUEST;
	msg.cmd = IPMI_GET_DEVICE_GUID_CMD;
	msg.data = NULL;
	msg.data_len = 0;
	return i_ipmi_request(NULL,
			      intf,
			      (struct ipmi_addr *) &si,
			      0,
			      &msg,
			      intf,
			      NULL,
			      NULL,
			      0,
			      intf->channels[0].address,
			      intf->channels[0].lun,
			      -1, 0);
}

static void
guid_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
	if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
	    || (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE)
	    || (msg->msg.cmd != IPMI_GET_DEVICE_GUID_CMD))
		/* Not for me */
		return;

	if (msg->msg.data[0] != 0) {
		/* Error from getting the GUID, the BMC doesn't have one. */
		intf->bmc->guid_set = 0;
		goto out;
	}

	if (msg->msg.data_len < 17) {
		intf->bmc->guid_set = 0;
		printk(KERN_WARNING PFX
		       "guid_handler: The GUID response from the BMC was too"
		       " short, it was %d but should have been 17.  Assuming"
		       " GUID is not available.\n",
		       msg->msg.data_len);
		goto out;
	}

	memcpy(intf->bmc->guid, msg->msg.data, 16);
	intf->bmc->guid_set = 1;
 out:
	wake_up(&intf->waitq);
}

static void
get_guid(ipmi_smi_t intf)
{
	int rv;

	intf->bmc->guid_set = 0x2;
	intf->null_user_handler = guid_handler;
	rv = send_guid_cmd(intf, 0);
	if (rv)
		/* Send failed, no GUID available. */
		intf->bmc->guid_set = 0;
	wait_event(intf->waitq, intf->bmc->guid_set != 2);
	intf->null_user_handler = NULL;
}

static int
send_channel_info_cmd(ipmi_smi_t intf, int chan)
{
	struct kernel_ipmi_msg            msg;
	unsigned char                     data[1];
	struct ipmi_system_interface_addr si;

	si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	si.channel = IPMI_BMC_CHANNEL;
	si.lun = 0;

	msg.netfn = IPMI_NETFN_APP_REQUEST;
	msg.cmd = IPMI_GET_CHANNEL_INFO_CMD;
	msg.data = data;
	msg.data_len = 1;
	data[0] = chan;
	return i_ipmi_request(NULL,
			      intf,
			      (struct ipmi_addr *) &si,
			      0,
			      &msg,
			      intf,
			      NULL,
			      NULL,
			      0,
			      intf->channels[0].address,
			      intf->channels[0].lun,
			      -1, 0);
}

static void
channel_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
	int rv = 0;
	int chan;

	if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
	    && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
	    && (msg->msg.cmd == IPMI_GET_CHANNEL_INFO_CMD)) {
		/* It's the one we want */
		if (msg->msg.data[0] != 0) {
			/* Got an error from the channel, just go on. */

			if (msg->msg.data[0] == IPMI_INVALID_COMMAND_ERR) {
				/*
				 * If the MC does not support this
				 * command, that is legal.  We just
				 * assume it has one IPMB at channel
				 * zero.
				 */
				intf->channels[0].medium
					= IPMI_CHANNEL_MEDIUM_IPMB;
				intf->channels[0].protocol
					= IPMI_CHANNEL_PROTOCOL_IPMB;
				rv = -ENOSYS;

				intf->curr_channel = IPMI_MAX_CHANNELS;
				wake_up(&intf->waitq);
				goto out;
			}
			goto next_channel;
		}
		if (msg->msg.data_len < 4) {
			/* Message not big enough, just go on. */
			goto next_channel;
		}
		chan = intf->curr_channel;
		intf->channels[chan].medium = msg->msg.data[2] & 0x7f;
		intf->channels[chan].protocol = msg->msg.data[3] & 0x1f;

 next_channel:
		intf->curr_channel++;
		if (intf->curr_channel >= IPMI_MAX_CHANNELS)
			wake_up(&intf->waitq);
		else
			rv = send_channel_info_cmd(intf, intf->curr_channel);

		if (rv) {
			/* Got an error somehow, just give up. */
			intf->curr_channel = IPMI_MAX_CHANNELS;
			wake_up(&intf->waitq);

			printk(KERN_WARNING PFX
			       "Error sending channel information: %d\n",
			       rv);
		}
	}
 out:
	return;
}

static void ipmi_poll(ipmi_smi_t intf)
{
	if (intf->handlers->poll)
		intf->handlers->poll(intf->send_info);
	/* In case something came in */
	handle_new_recv_msgs(intf);
}

void ipmi_poll_interface(ipmi_user_t user)
{
	ipmi_poll(user->intf);
}
EXPORT_SYMBOL(ipmi_poll_interface);

int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
		      void		       *send_info,
		      struct ipmi_device_id    *device_id,
		      struct device            *si_dev,
		      const char               *sysfs_name,
		      unsigned char            slave_addr)
{
	int              i, j;
	int              rv;
	ipmi_smi_t       intf;
	ipmi_smi_t       tintf;
	struct list_head *link;

	/*
	 * Make sure the driver is actually initialized, this handles
	 * problems with initialization order.
	 */
	if (!initialized) {
		rv = ipmi_init_msghandler();
		if (rv)
			return rv;
		/*
		 * The init code doesn't return an error if it was turned
		 * off, but it won't initialize.  Check that.
		 */
		if (!initialized)
			return -ENODEV;
	}

	intf = kzalloc(sizeof(*intf), GFP_KERNEL);
	if (!intf)
		return -ENOMEM;

	intf->ipmi_version_major = ipmi_version_major(device_id);
	intf->ipmi_version_minor = ipmi_version_minor(device_id);

	intf->bmc = kzalloc(sizeof(*intf->bmc), GFP_KERNEL);
	if (!intf->bmc) {
		kfree(intf);
		return -ENOMEM;
	}
	intf->intf_num = -1; /* Mark it invalid for now. */
	kref_init(&intf->refcount);
	intf->bmc->id = *device_id;
	intf->si_dev = si_dev;
	for (j = 0; j < IPMI_MAX_CHANNELS; j++) {
		intf->channels[j].address = IPMI_BMC_SLAVE_ADDR;
		intf->channels[j].lun = 2;
	}
	if (slave_addr != 0)
		intf->channels[0].address = slave_addr;
	INIT_LIST_HEAD(&intf->users);
	intf->handlers = handlers;
	intf->send_info = send_info;
	spin_lock_init(&intf->seq_lock);
	for (j = 0; j < IPMI_IPMB_NUM_SEQ; j++) {
		intf->seq_table[j].inuse = 0;
		intf->seq_table[j].seqid = 0;
	}
	intf->curr_seq = 0;
#ifdef CONFIG_PROC_FS
	mutex_init(&intf->proc_entry_lock);
#endif
	spin_lock_init(&intf->waiting_msgs_lock);
	INIT_LIST_HEAD(&intf->waiting_msgs);
	tasklet_init(&intf->recv_tasklet,
		     smi_recv_tasklet,
		     (unsigned long) intf);
	atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0);
	spin_lock_init(&intf->events_lock);
	INIT_LIST_HEAD(&intf->waiting_events);
	intf->waiting_events_count = 0;
	mutex_init(&intf->cmd_rcvrs_mutex);
	spin_lock_init(&intf->maintenance_mode_lock);
	INIT_LIST_HEAD(&intf->cmd_rcvrs);
	init_waitqueue_head(&intf->waitq);
	for (i = 0; i < IPMI_NUM_STATS; i++)
		atomic_set(&intf->stats[i], 0);

	intf->proc_dir = NULL;

	mutex_lock(&smi_watchers_mutex);
	mutex_lock(&ipmi_interfaces_mutex);
	/* Look for a hole in the numbers. */
	i = 0;
	link = &ipmi_interfaces;
	list_for_each_entry_rcu(tintf, &ipmi_interfaces, link) {
		if (tintf->intf_num != i) {
			link = &tintf->link;
			break;
		}
		i++;
	}
	/* Add the new interface in numeric order. */
	if (i == 0)
		list_add_rcu(&intf->link, &ipmi_interfaces);
	else
		list_add_tail_rcu(&intf->link, link);

	rv = handlers->start_processing(send_info, intf);
	if (rv)
		goto out;

	get_guid(intf);

	if ((intf->ipmi_version_major > 1)
			|| ((intf->ipmi_version_major == 1)
			    && (intf->ipmi_version_minor >= 5))) {
		/*
		 * Start scanning the channels to see what is
		 * available.
		 */
		intf->null_user_handler = channel_handler;
		intf->curr_channel = 0;
		rv = send_channel_info_cmd(intf, 0);
		if (rv)
			goto out;

		/* Wait for the channel info to be read. */
		wait_event(intf->waitq,
			   intf->curr_channel >= IPMI_MAX_CHANNELS);
		intf->null_user_handler = NULL;
	} else {
		/* Assume a single IPMB channel at zero. */
		intf->channels[0].medium = IPMI_CHANNEL_MEDIUM_IPMB;
		intf->channels[0].protocol = IPMI_CHANNEL_PROTOCOL_IPMB;
		intf->curr_channel = IPMI_MAX_CHANNELS;
	}

	if (rv == 0)
		rv = add_proc_entries(intf, i);

	rv = ipmi_bmc_register(intf, i, sysfs_name);

 out:
	if (rv) {
		if (intf->proc_dir)
			remove_proc_entries(intf);
		intf->handlers = NULL;
		list_del_rcu(&intf->link);
		mutex_unlock(&ipmi_interfaces_mutex);
		mutex_unlock(&smi_watchers_mutex);
		synchronize_rcu();
		kref_put(&intf->refcount, intf_free);
	} else {
		/*
		 * Keep memory order straight for RCU readers.  Make
		 * sure everything else is committed to memory before
		 * setting intf_num to mark the interface valid.
		 */
		smp_wmb();
		intf->intf_num = i;
		mutex_unlock(&ipmi_interfaces_mutex);
		/* After this point the interface is legal to use. */
		call_smi_watchers(i, intf->si_dev);
		mutex_unlock(&smi_watchers_mutex);
	}

	return rv;
}
EXPORT_SYMBOL(ipmi_register_smi);

static void cleanup_smi_msgs(ipmi_smi_t intf)
{
	int              i;
	struct seq_table *ent;

	/* No need for locks, the interface is down. */
	for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
		ent = &(intf->seq_table[i]);
		if (!ent->inuse)
			continue;
		deliver_err_response(ent->recv_msg, IPMI_ERR_UNSPECIFIED);
	}
}

int ipmi_unregister_smi(ipmi_smi_t intf)
{
	struct ipmi_smi_watcher *w;
	int    intf_num = intf->intf_num;

	ipmi_bmc_unregister(intf);

	mutex_lock(&smi_watchers_mutex);
	mutex_lock(&ipmi_interfaces_mutex);
	intf->intf_num = -1;
	intf->handlers = NULL;
	list_del_rcu(&intf->link);
	mutex_unlock(&ipmi_interfaces_mutex);
	synchronize_rcu();

	cleanup_smi_msgs(intf);

	remove_proc_entries(intf);

	/*
	 * Call all the watcher interfaces to tell them that
	 * an interface is gone.
	 */
	list_for_each_entry(w, &smi_watchers, link)
		w->smi_gone(intf_num);
	mutex_unlock(&smi_watchers_mutex);

	kref_put(&intf->refcount, intf_free);
	return 0;
}
EXPORT_SYMBOL(ipmi_unregister_smi);

static int handle_ipmb_get_msg_rsp(ipmi_smi_t          intf,
				   struct ipmi_smi_msg *msg)
{
	struct ipmi_ipmb_addr ipmb_addr;
	struct ipmi_recv_msg  *recv_msg;

	/*
	 * This is 11, not 10, because the response must contain a
	 * completion code.
	 */
	if (msg->rsp_size < 11) {
		/* Message not big enough, just ignore it. */
		ipmi_inc_stat(intf, invalid_ipmb_responses);
		return 0;
	}

	if (msg->rsp[2] != 0) {
		/* An error getting the response, just ignore it. */
		return 0;
	}

	ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
	ipmb_addr.slave_addr = msg->rsp[6];
	ipmb_addr.channel = msg->rsp[3] & 0x0f;
	ipmb_addr.lun = msg->rsp[7] & 3;

	/*
	 * It's a response from a remote entity.  Look up the sequence
	 * number and handle the response.
	 */
	if (intf_find_seq(intf,
			  msg->rsp[7] >> 2,
			  msg->rsp[3] & 0x0f,
			  msg->rsp[8],
			  (msg->rsp[4] >> 2) & (~1),
			  (struct ipmi_addr *) &(ipmb_addr),
			  &recv_msg)) {
		/*
		 * We were unable to find the sequence number,
		 * so just nuke the message.
		 */
		ipmi_inc_stat(intf, unhandled_ipmb_responses);
		return 0;
	}

	memcpy(recv_msg->msg_data,
	       &(msg->rsp[9]),
	       msg->rsp_size - 9);
	/*
	 * The other fields matched, so no need to set them, except
	 * for netfn, which needs to be the response that was
	 * returned, not the request value.
	 */
	recv_msg->msg.netfn = msg->rsp[4] >> 2;
	recv_msg->msg.data = recv_msg->msg_data;
	recv_msg->msg.data_len = msg->rsp_size - 10;
	recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
	ipmi_inc_stat(intf, handled_ipmb_responses);
	deliver_response(recv_msg);

	return 0;
}

static int handle_ipmb_get_msg_cmd(ipmi_smi_t          intf,
				   struct ipmi_smi_msg *msg)
{
	struct cmd_rcvr          *rcvr;
	int                      rv = 0;
	unsigned char            netfn;
	unsigned char            cmd;
	unsigned char            chan;
	ipmi_user_t              user = NULL;
	struct ipmi_ipmb_addr    *ipmb_addr;
	struct ipmi_recv_msg     *recv_msg;
	struct ipmi_smi_handlers *handlers;

	if (msg->rsp_size < 10) {
		/* Message not big enough, just ignore it. */
		ipmi_inc_stat(intf, invalid_commands);
		return 0;
	}

	if (msg->rsp[2] != 0) {
		/* An error getting the response, just ignore it. */
		return 0;
	}

	netfn = msg->rsp[4] >> 2;
	cmd = msg->rsp[8];
	chan = msg->rsp[3] & 0xf;

	rcu_read_lock();
	rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
	if (rcvr) {
		user = rcvr->user;
		kref_get(&user->refcount);
	} else
		user = NULL;
	rcu_read_unlock();

	if (user == NULL) {
		/* We didn't find a user, deliver an error response. */
		ipmi_inc_stat(intf, unhandled_commands);

		msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
		msg->data[1] = IPMI_SEND_MSG_CMD;
		msg->data[2] = msg->rsp[3];
		msg->data[3] = msg->rsp[6];
		msg->data[4] = ((netfn + 1) << 2) | (msg->rsp[7] & 0x3);
		msg->data[5] = ipmb_checksum(&(msg->data[3]), 2);
		msg->data[6] = intf->channels[msg->rsp[3] & 0xf].address;
		/* rqseq/lun */
		msg->data[7] = (msg->rsp[7] & 0xfc) | (msg->rsp[4] & 0x3);
		msg->data[8] = msg->rsp[8]; /* cmd */
		msg->data[9] = IPMI_INVALID_CMD_COMPLETION_CODE;
		msg->data[10] = ipmb_checksum(&(msg->data[6]), 4);
		msg->data_size = 11;

#ifdef DEBUG_MSGING
	{
		int m;
		printk("Invalid command:");
		for (m = 0; m < msg->data_size; m++)
			printk(" %2.2x", msg->data[m]);
		printk("\n");
	}
#endif
		rcu_read_lock();
		handlers = intf->handlers;
		if (handlers) {
			handlers->sender(intf->send_info, msg, 0);
			/*
			 * We used the message, so return the value
			 * that causes it to not be freed or
			 * queued.
			 */
			rv = -1;
		}
		rcu_read_unlock();
	} else {
		/* Deliver the message to the user. */
		ipmi_inc_stat(intf, handled_commands);

		recv_msg = ipmi_alloc_recv_msg();
		if (!recv_msg) {
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling
			 * later.
			 */
			rv = 1;
			kref_put(&user->refcount, free_user);
		} else {
			/* Extract the source address from the data. */
			ipmb_addr = (struct ipmi_ipmb_addr *) &recv_msg->addr;
			ipmb_addr->addr_type = IPMI_IPMB_ADDR_TYPE;
			ipmb_addr->slave_addr = msg->rsp[6];
			ipmb_addr->lun = msg->rsp[7] & 3;
			ipmb_addr->channel = msg->rsp[3] & 0xf;

			/*
			 * Extract the rest of the message information
			 * from the IPMB header.
			 */
			recv_msg->user = user;
			recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
			recv_msg->msgid = msg->rsp[7] >> 2;
			recv_msg->msg.netfn = msg->rsp[4] >> 2;
			recv_msg->msg.cmd = msg->rsp[8];
			recv_msg->msg.data = recv_msg->msg_data;

			/*
			 * We chop off 10, not 9 bytes because the checksum
			 * at the end also needs to be removed.
			 */
			recv_msg->msg.data_len = msg->rsp_size - 10;
			memcpy(recv_msg->msg_data,
			       &(msg->rsp[9]),
			       msg->rsp_size - 10);
			deliver_response(recv_msg);
		}
	}

	return rv;
}

static int handle_lan_get_msg_rsp(ipmi_smi_t          intf,
				  struct ipmi_smi_msg *msg)
{
	struct ipmi_lan_addr  lan_addr;
	struct ipmi_recv_msg  *recv_msg;


	/*
	 * This is 13, not 12, because the response must contain a
	 * completion code.
	 */
	if (msg->rsp_size < 13) {
		/* Message not big enough, just ignore it. */
		ipmi_inc_stat(intf, invalid_lan_responses);
		return 0;
	}

	if (msg->rsp[2] != 0) {
		/* An error getting the response, just ignore it. */
		return 0;
	}

	lan_addr.addr_type = IPMI_LAN_ADDR_TYPE;
	lan_addr.session_handle = msg->rsp[4];
	lan_addr.remote_SWID = msg->rsp[8];
	lan_addr.local_SWID = msg->rsp[5];
	lan_addr.channel = msg->rsp[3] & 0x0f;
	lan_addr.privilege = msg->rsp[3] >> 4;
	lan_addr.lun = msg->rsp[9] & 3;

	/*
	 * It's a response from a remote entity.  Look up the sequence
	 * number and handle the response.
	 */
	if (intf_find_seq(intf,
			  msg->rsp[9] >> 2,
			  msg->rsp[3] & 0x0f,
			  msg->rsp[10],
			  (msg->rsp[6] >> 2) & (~1),
			  (struct ipmi_addr *) &(lan_addr),
			  &recv_msg)) {
		/*
		 * We were unable to find the sequence number,
		 * so just nuke the message.
		 */
		ipmi_inc_stat(intf, unhandled_lan_responses);
		return 0;
	}

	memcpy(recv_msg->msg_data,
	       &(msg->rsp[11]),
	       msg->rsp_size - 11);
	/*
	 * The other fields matched, so no need to set them, except
	 * for netfn, which needs to be the response that was
	 * returned, not the request value.
	 */
	recv_msg->msg.netfn = msg->rsp[6] >> 2;
	recv_msg->msg.data = recv_msg->msg_data;
	recv_msg->msg.data_len = msg->rsp_size - 12;
	recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
	ipmi_inc_stat(intf, handled_lan_responses);
	deliver_response(recv_msg);

	return 0;
}

static int handle_lan_get_msg_cmd(ipmi_smi_t          intf,
				  struct ipmi_smi_msg *msg)
{
	struct cmd_rcvr          *rcvr;
	int                      rv = 0;
	unsigned char            netfn;
	unsigned char            cmd;
	unsigned char            chan;
	ipmi_user_t              user = NULL;
	struct ipmi_lan_addr     *lan_addr;
	struct ipmi_recv_msg     *recv_msg;

	if (msg->rsp_size < 12) {
		/* Message not big enough, just ignore it. */
		ipmi_inc_stat(intf, invalid_commands);
		return 0;
	}

	if (msg->rsp[2] != 0) {
		/* An error getting the response, just ignore it. */
		return 0;
	}

	netfn = msg->rsp[6] >> 2;
	cmd = msg->rsp[10];
	chan = msg->rsp[3] & 0xf;

	rcu_read_lock();
	rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
	if (rcvr) {
		user = rcvr->user;
		kref_get(&user->refcount);
	} else
		user = NULL;
	rcu_read_unlock();

	if (user == NULL) {
		/* We didn't find a user, just give up. */
		ipmi_inc_stat(intf, unhandled_commands);

		/*
		 * Don't do anything with these messages, just allow
		 * them to be freed.
		 */
		rv = 0;
	} else {
		/* Deliver the message to the user. */
		ipmi_inc_stat(intf, handled_commands);

		recv_msg = ipmi_alloc_recv_msg();
		if (!recv_msg) {
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling later.
			 */
			rv = 1;
			kref_put(&user->refcount, free_user);
		} else {
			/* Extract the source address from the data. */
			lan_addr = (struct ipmi_lan_addr *) &recv_msg->addr;
			lan_addr->addr_type = IPMI_LAN_ADDR_TYPE;
			lan_addr->session_handle = msg->rsp[4];
			lan_addr->remote_SWID = msg->rsp[8];
			lan_addr->local_SWID = msg->rsp[5];
			lan_addr->lun = msg->rsp[9] & 3;
			lan_addr->channel = msg->rsp[3] & 0xf;
			lan_addr->privilege = msg->rsp[3] >> 4;

			/*
			 * Extract the rest of the message information
			 * from the IPMB header.
			 */
			recv_msg->user = user;
			recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
			recv_msg->msgid = msg->rsp[9] >> 2;
			recv_msg->msg.netfn = msg->rsp[6] >> 2;
			recv_msg->msg.cmd = msg->rsp[10];
			recv_msg->msg.data = recv_msg->msg_data;

			/*
			 * We chop off 12, not 11 bytes because the checksum
			 * at the end also needs to be removed.
			 */
			recv_msg->msg.data_len = msg->rsp_size - 12;
			memcpy(recv_msg->msg_data,
			       &(msg->rsp[11]),
			       msg->rsp_size - 12);
			deliver_response(recv_msg);
		}
	}

	return rv;
}

/*
 * This routine will handle "Get Message" command responses with
 * channels that use an OEM Medium. The message format belongs to
 * the OEM.  See IPMI 2.0 specification, Chapter 6 and
 * Chapter 22, sections 22.6 and 22.24 for more details.
 */
static int handle_oem_get_msg_cmd(ipmi_smi_t          intf,
				  struct ipmi_smi_msg *msg)
{
	struct cmd_rcvr       *rcvr;
	int                   rv = 0;
	unsigned char         netfn;
	unsigned char         cmd;
	unsigned char         chan;
	ipmi_user_t           user = NULL;
	struct ipmi_system_interface_addr *smi_addr;
	struct ipmi_recv_msg  *recv_msg;

	/*
	 * We expect the OEM SW to perform error checking
	 * so we just do some basic sanity checks
	 */
	if (msg->rsp_size < 4) {
		/* Message not big enough, just ignore it. */
		ipmi_inc_stat(intf, invalid_commands);
		return 0;
	}

	if (msg->rsp[2] != 0) {
		/* An error getting the response, just ignore it. */
		return 0;
	}

	/*
	 * This is an OEM Message so the OEM needs to know how
	 * handle the message. We do no interpretation.
	 */
	netfn = msg->rsp[0] >> 2;
	cmd = msg->rsp[1];
	chan = msg->rsp[3] & 0xf;

	rcu_read_lock();
	rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
	if (rcvr) {
		user = rcvr->user;
		kref_get(&user->refcount);
	} else
		user = NULL;
	rcu_read_unlock();

	if (user == NULL) {
		/* We didn't find a user, just give up. */
		ipmi_inc_stat(intf, unhandled_commands);

		/*
		 * Don't do anything with these messages, just allow
		 * them to be freed.
		 */

		rv = 0;
	} else {
		/* Deliver the message to the user. */
		ipmi_inc_stat(intf, handled_commands);

		recv_msg = ipmi_alloc_recv_msg();
		if (!recv_msg) {
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling
			 * later.
			 */
			rv = 1;
			kref_put(&user->refcount, free_user);
		} else {
			/*
			 * OEM Messages are expected to be delivered via
			 * the system interface to SMS software.  We might
			 * need to visit this again depending on OEM
			 * requirements
			 */
			smi_addr = ((struct ipmi_system_interface_addr *)
				    &(recv_msg->addr));
			smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
			smi_addr->channel = IPMI_BMC_CHANNEL;
			smi_addr->lun = msg->rsp[0] & 3;

			recv_msg->user = user;
			recv_msg->user_msg_data = NULL;
			recv_msg->recv_type = IPMI_OEM_RECV_TYPE;
			recv_msg->msg.netfn = msg->rsp[0] >> 2;
			recv_msg->msg.cmd = msg->rsp[1];
			recv_msg->msg.data = recv_msg->msg_data;

			/*
			 * The message starts at byte 4 which follows the
			 * the Channel Byte in the "GET MESSAGE" command
			 */
			recv_msg->msg.data_len = msg->rsp_size - 4;
			memcpy(recv_msg->msg_data,
			       &(msg->rsp[4]),
			       msg->rsp_size - 4);
			deliver_response(recv_msg);
		}
	}

	return rv;
}

static void copy_event_into_recv_msg(struct ipmi_recv_msg *recv_msg,
				     struct ipmi_smi_msg  *msg)
{
	struct ipmi_system_interface_addr *smi_addr;

	recv_msg->msgid = 0;
	smi_addr = (struct ipmi_system_interface_addr *) &(recv_msg->addr);
	smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	smi_addr->channel = IPMI_BMC_CHANNEL;
	smi_addr->lun = msg->rsp[0] & 3;
	recv_msg->recv_type = IPMI_ASYNC_EVENT_RECV_TYPE;
	recv_msg->msg.netfn = msg->rsp[0] >> 2;
	recv_msg->msg.cmd = msg->rsp[1];
	memcpy(recv_msg->msg_data, &(msg->rsp[3]), msg->rsp_size - 3);
	recv_msg->msg.data = recv_msg->msg_data;
	recv_msg->msg.data_len = msg->rsp_size - 3;
}

static int handle_read_event_rsp(ipmi_smi_t          intf,
				 struct ipmi_smi_msg *msg)
{
	struct ipmi_recv_msg *recv_msg, *recv_msg2;
	struct list_head     msgs;
	ipmi_user_t          user;
	int                  rv = 0;
	int                  deliver_count = 0;
	unsigned long        flags;

	if (msg->rsp_size < 19) {
		/* Message is too small to be an IPMB event. */
		ipmi_inc_stat(intf, invalid_events);
		return 0;
	}

	if (msg->rsp[2] != 0) {
		/* An error getting the event, just ignore it. */
		return 0;
	}

	INIT_LIST_HEAD(&msgs);

	spin_lock_irqsave(&intf->events_lock, flags);

	ipmi_inc_stat(intf, events);

	/*
	 * Allocate and fill in one message for every user that is
	 * getting events.
	 */
	rcu_read_lock();
	list_for_each_entry_rcu(user, &intf->users, link) {
		if (!user->gets_events)
			continue;

		recv_msg = ipmi_alloc_recv_msg();
		if (!recv_msg) {
			rcu_read_unlock();
			list_for_each_entry_safe(recv_msg, recv_msg2, &msgs,
						 link) {
				list_del(&recv_msg->link);
				ipmi_free_recv_msg(recv_msg);
			}
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling
			 * later.
			 */
			rv = 1;
			goto out;
		}

		deliver_count++;

		copy_event_into_recv_msg(recv_msg, msg);
		recv_msg->user = user;
		kref_get(&user->refcount);
		list_add_tail(&(recv_msg->link), &msgs);
	}
	rcu_read_unlock();

	if (deliver_count) {
		/* Now deliver all the messages. */
		list_for_each_entry_safe(recv_msg, recv_msg2, &msgs, link) {
			list_del(&recv_msg->link);
			deliver_response(recv_msg);
		}
	} else if (intf->waiting_events_count < MAX_EVENTS_IN_QUEUE) {
		/*
		 * No one to receive the message, put it in queue if there's
		 * not already too many things in the queue.
		 */
		recv_msg = ipmi_alloc_recv_msg();
		if (!recv_msg) {
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling
			 * later.
			 */
			rv = 1;
			goto out;
		}

		copy_event_into_recv_msg(recv_msg, msg);
		list_add_tail(&(recv_msg->link), &(intf->waiting_events));
		intf->waiting_events_count++;
	} else if (!intf->event_msg_printed) {
		/*
		 * There's too many things in the queue, discard this
		 * message.
		 */
		printk(KERN_WARNING PFX "Event queue full, discarding"
		       " incoming events\n");
		intf->event_msg_printed = 1;
	}

 out:
	spin_unlock_irqrestore(&(intf->events_lock), flags);

	return rv;
}

static int handle_bmc_rsp(ipmi_smi_t          intf,
			  struct ipmi_smi_msg *msg)
{
	struct ipmi_recv_msg *recv_msg;
	struct ipmi_user     *user;

	recv_msg = (struct ipmi_recv_msg *) msg->user_data;
	if (recv_msg == NULL) {
		printk(KERN_WARNING
		       "IPMI message received with no owner. This\n"
		       "could be because of a malformed message, or\n"
		       "because of a hardware error.  Contact your\n"
		       "hardware vender for assistance\n");
		return 0;
	}

	user = recv_msg->user;
	/* Make sure the user still exists. */
	if (user && !user->valid) {
		/* The user for the message went away, so give up. */
		ipmi_inc_stat(intf, unhandled_local_responses);
		ipmi_free_recv_msg(recv_msg);
	} else {
		struct ipmi_system_interface_addr *smi_addr;

		ipmi_inc_stat(intf, handled_local_responses);
		recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
		recv_msg->msgid = msg->msgid;
		smi_addr = ((struct ipmi_system_interface_addr *)
			    &(recv_msg->addr));
		smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
		smi_addr->channel = IPMI_BMC_CHANNEL;
		smi_addr->lun = msg->rsp[0] & 3;
		recv_msg->msg.netfn = msg->rsp[0] >> 2;
		recv_msg->msg.cmd = msg->rsp[1];
		memcpy(recv_msg->msg_data,
		       &(msg->rsp[2]),
		       msg->rsp_size - 2);
		recv_msg->msg.data = recv_msg->msg_data;
		recv_msg->msg.data_len = msg->rsp_size - 2;
		deliver_response(recv_msg);
	}

	return 0;
}

/*
 * Handle a received message.  Return 1 if the message should be requeued,
 * 0 if the message should be freed, or -1 if the message should not
 * be freed or requeued.
 */
static int handle_one_recv_msg(ipmi_smi_t          intf,
			       struct ipmi_smi_msg *msg)
{
	int requeue;
	int chan;

#ifdef DEBUG_MSGING
	int m;
	printk("Recv:");
	for (m = 0; m < msg->rsp_size; m++)
		printk(" %2.2x", msg->rsp[m]);
	printk("\n");
#endif
	if (msg->rsp_size < 2) {
		/* Message is too small to be correct. */
		printk(KERN_WARNING PFX "BMC returned to small a message"
		       " for netfn %x cmd %x, got %d bytes\n",
		       (msg->data[0] >> 2) | 1, msg->data[1], msg->rsp_size);

		/* Generate an error response for the message. */
		msg->rsp[0] = msg->data[0] | (1 << 2);
		msg->rsp[1] = msg->data[1];
		msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
		msg->rsp_size = 3;
	} else if (((msg->rsp[0] >> 2) != ((msg->data[0] >> 2) | 1))
		   || (msg->rsp[1] != msg->data[1])) {
		/*
		 * The NetFN and Command in the response is not even
		 * marginally correct.
		 */
		printk(KERN_WARNING PFX "BMC returned incorrect response,"
		       " expected netfn %x cmd %x, got netfn %x cmd %x\n",
		       (msg->data[0] >> 2) | 1, msg->data[1],
		       msg->rsp[0] >> 2, msg->rsp[1]);

		/* Generate an error response for the message. */
		msg->rsp[0] = msg->data[0] | (1 << 2);
		msg->rsp[1] = msg->data[1];
		msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
		msg->rsp_size = 3;
	}

	if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
	    && (msg->rsp[1] == IPMI_SEND_MSG_CMD)
	    && (msg->user_data != NULL)) {
		/*
		 * It's a response to a response we sent.  For this we
		 * deliver a send message response to the user.
		 */
		struct ipmi_recv_msg     *recv_msg = msg->user_data;

		requeue = 0;
		if (msg->rsp_size < 2)
			/* Message is too small to be correct. */
			goto out;

		chan = msg->data[2] & 0x0f;
		if (chan >= IPMI_MAX_CHANNELS)
			/* Invalid channel number */
			goto out;

		if (!recv_msg)
			goto out;

		/* Make sure the user still exists. */
		if (!recv_msg->user || !recv_msg->user->valid)
			goto out;

		recv_msg->recv_type = IPMI_RESPONSE_RESPONSE_TYPE;
		recv_msg->msg.data = recv_msg->msg_data;
		recv_msg->msg.data_len = 1;
		recv_msg->msg_data[0] = msg->rsp[2];
		deliver_response(recv_msg);
	} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
		   && (msg->rsp[1] == IPMI_GET_MSG_CMD)) {
		/* It's from the receive queue. */
		chan = msg->rsp[3] & 0xf;
		if (chan >= IPMI_MAX_CHANNELS) {
			/* Invalid channel number */
			requeue = 0;
			goto out;
		}

		/*
		 * We need to make sure the channels have been initialized.
		 * The channel_handler routine will set the "curr_channel"
		 * equal to or greater than IPMI_MAX_CHANNELS when all the
		 * channels for this interface have been initialized.
		 */
		if (intf->curr_channel < IPMI_MAX_CHANNELS) {
			requeue = 0; /* Throw the message away */
			goto out;
		}

		switch (intf->channels[chan].medium) {
		case IPMI_CHANNEL_MEDIUM_IPMB:
			if (msg->rsp[4] & 0x04) {
				/*
				 * It's a response, so find the
				 * requesting message and send it up.
				 */
				requeue = handle_ipmb_get_msg_rsp(intf, msg);
			} else {
				/*
				 * It's a command to the SMS from some other
				 * entity.  Handle that.
				 */
				requeue = handle_ipmb_get_msg_cmd(intf, msg);
			}
			break;

		case IPMI_CHANNEL_MEDIUM_8023LAN:
		case IPMI_CHANNEL_MEDIUM_ASYNC:
			if (msg->rsp[6] & 0x04) {
				/*
				 * It's a response, so find the
				 * requesting message and send it up.
				 */
				requeue = handle_lan_get_msg_rsp(intf, msg);
			} else {
				/*
				 * It's a command to the SMS from some other
				 * entity.  Handle that.
				 */
				requeue = handle_lan_get_msg_cmd(intf, msg);
			}
			break;

		default:
			/* Check for OEM Channels.  Clients had better
			   register for these commands. */
			if ((intf->channels[chan].medium
			     >= IPMI_CHANNEL_MEDIUM_OEM_MIN)
			    && (intf->channels[chan].medium
				<= IPMI_CHANNEL_MEDIUM_OEM_MAX)) {
				requeue = handle_oem_get_msg_cmd(intf, msg);
			} else {
				/*
				 * We don't handle the channel type, so just
				 * free the message.
				 */
				requeue = 0;
			}
		}

	} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
		   && (msg->rsp[1] == IPMI_READ_EVENT_MSG_BUFFER_CMD)) {
		/* It's an asynchronous event. */
		requeue = handle_read_event_rsp(intf, msg);
	} else {
		/* It's a response from the local BMC. */
		requeue = handle_bmc_rsp(intf, msg);
	}

 out:
	return requeue;
}

/*
 * If there are messages in the queue or pretimeouts, handle them.
 */
static void handle_new_recv_msgs(ipmi_smi_t intf)
{
	struct ipmi_smi_msg  *smi_msg;
	unsigned long        flags = 0;
	int                  rv;
	int                  run_to_completion = intf->run_to_completion;

	/* See if any waiting messages need to be processed. */
	if (!run_to_completion)
		spin_lock_irqsave(&intf->waiting_msgs_lock, flags);
	while (!list_empty(&intf->waiting_msgs)) {
		smi_msg = list_entry(intf->waiting_msgs.next,
				     struct ipmi_smi_msg, link);
		list_del(&smi_msg->link);
		if (!run_to_completion)
			spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags);
		rv = handle_one_recv_msg(intf, smi_msg);
		if (!run_to_completion)
			spin_lock_irqsave(&intf->waiting_msgs_lock, flags);
		if (rv == 0) {
			/* Message handled */
			ipmi_free_smi_msg(smi_msg);
		} else if (rv < 0) {
			/* Fatal error on the message, del but don't free. */
		} else {
			/*
			 * To preserve message order, quit if we
			 * can't handle a message.
			 */
			list_add(&smi_msg->link, &intf->waiting_msgs);
			break;
		}
	}
	if (!run_to_completion)
		spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags);

	/*
	 * If the pretimout count is non-zero, decrement one from it and
	 * deliver pretimeouts to all the users.
	 */
	if (atomic_add_unless(&intf->watchdog_pretimeouts_to_deliver, -1, 0)) {
		ipmi_user_t user;

		rcu_read_lock();
		list_for_each_entry_rcu(user, &intf->users, link) {
			if (user->handler->ipmi_watchdog_pretimeout)
				user->handler->ipmi_watchdog_pretimeout(
					user->handler_data);
		}
		rcu_read_unlock();
	}
}

static void smi_recv_tasklet(unsigned long val)
{
	handle_new_recv_msgs((ipmi_smi_t) val);
}

/* Handle a new message from the lower layer. */
void ipmi_smi_msg_received(ipmi_smi_t          intf,
			   struct ipmi_smi_msg *msg)
{
	unsigned long flags = 0; /* keep us warning-free. */
	int           run_to_completion;


	if ((msg->data_size >= 2)
	    && (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2))
	    && (msg->data[1] == IPMI_SEND_MSG_CMD)
	    && (msg->user_data == NULL)) {
		/*
		 * This is the local response to a command send, start
		 * the timer for these.  The user_data will not be
		 * NULL if this is a response send, and we will let
		 * response sends just go through.
		 */

		/*
		 * Check for errors, if we get certain errors (ones
		 * that mean basically we can try again later), we
		 * ignore them and start the timer.  Otherwise we
		 * report the error immediately.
		 */
		if ((msg->rsp_size >= 3) && (msg->rsp[2] != 0)
		    && (msg->rsp[2] != IPMI_NODE_BUSY_ERR)
		    && (msg->rsp[2] != IPMI_LOST_ARBITRATION_ERR)
		    && (msg->rsp[2] != IPMI_BUS_ERR)
		    && (msg->rsp[2] != IPMI_NAK_ON_WRITE_ERR)) {
			int chan = msg->rsp[3] & 0xf;

			/* Got an error sending the message, handle it. */
			if (chan >= IPMI_MAX_CHANNELS)
				; /* This shouldn't happen */
			else if ((intf->channels[chan].medium
				  == IPMI_CHANNEL_MEDIUM_8023LAN)
				 || (intf->channels[chan].medium
				     == IPMI_CHANNEL_MEDIUM_ASYNC))
				ipmi_inc_stat(intf, sent_lan_command_errs);
			else
				ipmi_inc_stat(intf, sent_ipmb_command_errs);
			intf_err_seq(intf, msg->msgid, msg->rsp[2]);
		} else
			/* The message was sent, start the timer. */
			intf_start_seq_timer(intf, msg->msgid);

		ipmi_free_smi_msg(msg);
		goto out;
	}

	/*
	 * To preserve message order, if the list is not empty, we
	 * tack this message onto the end of the list.
	 */
	run_to_completion = intf->run_to_completion;
	if (!run_to_completion)
		spin_lock_irqsave(&intf->waiting_msgs_lock, flags);
	list_add_tail(&msg->link, &intf->waiting_msgs);
	if (!run_to_completion)
		spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags);

	tasklet_schedule(&intf->recv_tasklet);
 out:
	return;
}
EXPORT_SYMBOL(ipmi_smi_msg_received);

void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf)
{
	atomic_set(&intf->watchdog_pretimeouts_to_deliver, 1);
	tasklet_schedule(&intf->recv_tasklet);
}
EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout);

static struct ipmi_smi_msg *
smi_from_recv_msg(ipmi_smi_t intf, struct ipmi_recv_msg *recv_msg,
		  unsigned char seq, long seqid)
{
	struct ipmi_smi_msg *smi_msg = ipmi_alloc_smi_msg();
	if (!smi_msg)
		/*
		 * If we can't allocate the message, then just return, we
		 * get 4 retries, so this should be ok.
		 */
		return NULL;

	memcpy(smi_msg->data, recv_msg->msg.data, recv_msg->msg.data_len);
	smi_msg->data_size = recv_msg->msg.data_len;
	smi_msg->msgid = STORE_SEQ_IN_MSGID(seq, seqid);

#ifdef DEBUG_MSGING
	{
		int m;
		printk("Resend: ");
		for (m = 0; m < smi_msg->data_size; m++)
			printk(" %2.2x", smi_msg->data[m]);
		printk("\n");
	}
#endif
	return smi_msg;
}

static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
			      struct list_head *timeouts, long timeout_period,
			      int slot, unsigned long *flags)
{
	struct ipmi_recv_msg     *msg;
	struct ipmi_smi_handlers *handlers;

	if (intf->intf_num == -1)
		return;

	if (!ent->inuse)
		return;

	ent->timeout -= timeout_period;
	if (ent->timeout > 0)
		return;

	if (ent->retries_left == 0) {
		/* The message has used all its retries. */
		ent->inuse = 0;
		msg = ent->recv_msg;
		list_add_tail(&msg->link, timeouts);
		if (ent->broadcast)
			ipmi_inc_stat(intf, timed_out_ipmb_broadcasts);
		else if (is_lan_addr(&ent->recv_msg->addr))
			ipmi_inc_stat(intf, timed_out_lan_commands);
		else
			ipmi_inc_stat(intf, timed_out_ipmb_commands);
	} else {
		struct ipmi_smi_msg *smi_msg;
		/* More retries, send again. */

		/*
		 * Start with the max timer, set to normal timer after
		 * the message is sent.
		 */
		ent->timeout = MAX_MSG_TIMEOUT;
		ent->retries_left--;
		smi_msg = smi_from_recv_msg(intf, ent->recv_msg, slot,
					    ent->seqid);
		if (!smi_msg) {
			if (is_lan_addr(&ent->recv_msg->addr))
				ipmi_inc_stat(intf,
					      dropped_rexmit_lan_commands);
			else
				ipmi_inc_stat(intf,
					      dropped_rexmit_ipmb_commands);
			return;
		}

		spin_unlock_irqrestore(&intf->seq_lock, *flags);

		/*
		 * Send the new message.  We send with a zero
		 * priority.  It timed out, I doubt time is that
		 * critical now, and high priority messages are really
		 * only for messages to the local MC, which don't get
		 * resent.
		 */
		handlers = intf->handlers;
		if (handlers) {
			if (is_lan_addr(&ent->recv_msg->addr))
				ipmi_inc_stat(intf,
					      retransmitted_lan_commands);
			else
				ipmi_inc_stat(intf,
					      retransmitted_ipmb_commands);

			intf->handlers->sender(intf->send_info,
					       smi_msg, 0);
		} else
			ipmi_free_smi_msg(smi_msg);

		spin_lock_irqsave(&intf->seq_lock, *flags);
	}
}

static void ipmi_timeout_handler(long timeout_period)
{
	ipmi_smi_t           intf;
	struct list_head     timeouts;
	struct ipmi_recv_msg *msg, *msg2;
	unsigned long        flags;
	int                  i;

	rcu_read_lock();
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		tasklet_schedule(&intf->recv_tasklet);

		/*
		 * Go through the seq table and find any messages that
		 * have timed out, putting them in the timeouts
		 * list.
		 */
		INIT_LIST_HEAD(&timeouts);
		spin_lock_irqsave(&intf->seq_lock, flags);
		for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
			check_msg_timeout(intf, &(intf->seq_table[i]),
					  &timeouts, timeout_period, i,
					  &flags);
		spin_unlock_irqrestore(&intf->seq_lock, flags);

		list_for_each_entry_safe(msg, msg2, &timeouts, link)
			deliver_err_response(msg, IPMI_TIMEOUT_COMPLETION_CODE);

		/*
		 * Maintenance mode handling.  Check the timeout
		 * optimistically before we claim the lock.  It may
		 * mean a timeout gets missed occasionally, but that
		 * only means the timeout gets extended by one period
		 * in that case.  No big deal, and it avoids the lock
		 * most of the time.
		 */
		if (intf->auto_maintenance_timeout > 0) {
			spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
			if (intf->auto_maintenance_timeout > 0) {
				intf->auto_maintenance_timeout
					-= timeout_period;
				if (!intf->maintenance_mode
				    && (intf->auto_maintenance_timeout <= 0)) {
					intf->maintenance_mode_enable = 0;
					maintenance_mode_update(intf);
				}
			}
			spin_unlock_irqrestore(&intf->maintenance_mode_lock,
					       flags);
		}
	}
	rcu_read_unlock();
}

static void ipmi_request_event(void)
{
	ipmi_smi_t               intf;
	struct ipmi_smi_handlers *handlers;

	rcu_read_lock();
	/*
	 * Called from the timer, no need to check if handlers is
	 * valid.
	 */
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		/* No event requests when in maintenance mode. */
		if (intf->maintenance_mode_enable)
			continue;

		handlers = intf->handlers;
		if (handlers)
			handlers->request_events(intf->send_info);
	}
	rcu_read_unlock();
}

static struct timer_list ipmi_timer;

/* Call every ~1000 ms. */
#define IPMI_TIMEOUT_TIME	1000

/* How many jiffies does it take to get to the timeout time. */
#define IPMI_TIMEOUT_JIFFIES	((IPMI_TIMEOUT_TIME * HZ) / 1000)

/*
 * Request events from the queue every second (this is the number of
 * IPMI_TIMEOUT_TIMES between event requests).  Hopefully, in the
 * future, IPMI will add a way to know immediately if an event is in
 * the queue and this silliness can go away.
 */
#define IPMI_REQUEST_EV_TIME	(1000 / (IPMI_TIMEOUT_TIME))

static atomic_t stop_operation;
static unsigned int ticks_to_req_ev = IPMI_REQUEST_EV_TIME;

static void ipmi_timeout(unsigned long data)
{
	if (atomic_read(&stop_operation))
		return;

	ticks_to_req_ev--;
	if (ticks_to_req_ev == 0) {
		ipmi_request_event();
		ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
	}

	ipmi_timeout_handler(IPMI_TIMEOUT_TIME);

	mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
}


static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0);
static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0);

/* FIXME - convert these to slabs. */
static void free_smi_msg(struct ipmi_smi_msg *msg)
{
	atomic_dec(&smi_msg_inuse_count);
	kfree(msg);
}

struct ipmi_smi_msg *ipmi_alloc_smi_msg(void)
{
	struct ipmi_smi_msg *rv;
	rv = kmalloc(sizeof(struct ipmi_smi_msg), GFP_ATOMIC);
	if (rv) {
		rv->done = free_smi_msg;
		rv->user_data = NULL;
		atomic_inc(&smi_msg_inuse_count);
	}
	return rv;
}
EXPORT_SYMBOL(ipmi_alloc_smi_msg);

static void free_recv_msg(struct ipmi_recv_msg *msg)
{
	atomic_dec(&recv_msg_inuse_count);
	kfree(msg);
}

static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void)
{
	struct ipmi_recv_msg *rv;

	rv = kmalloc(sizeof(struct ipmi_recv_msg), GFP_ATOMIC);
	if (rv) {
		rv->user = NULL;
		rv->done = free_recv_msg;
		atomic_inc(&recv_msg_inuse_count);
	}
	return rv;
}

void ipmi_free_recv_msg(struct ipmi_recv_msg *msg)
{
	if (msg->user)
		kref_put(&msg->user->refcount, free_user);
	msg->done(msg);
}
EXPORT_SYMBOL(ipmi_free_recv_msg);

#ifdef CONFIG_IPMI_PANIC_EVENT

static atomic_t panic_done_count = ATOMIC_INIT(0);

static void dummy_smi_done_handler(struct ipmi_smi_msg *msg)
{
	atomic_dec(&panic_done_count);
}

static void dummy_recv_done_handler(struct ipmi_recv_msg *msg)
{
	atomic_dec(&panic_done_count);
}

/*
 * Inside a panic, send a message and wait for a response.
 */
static void ipmi_panic_request_and_wait(ipmi_smi_t           intf,
					struct ipmi_addr     *addr,
					struct kernel_ipmi_msg *msg)
{
	struct ipmi_smi_msg  smi_msg;
	struct ipmi_recv_msg recv_msg;
	int rv;

	smi_msg.done = dummy_smi_done_handler;
	recv_msg.done = dummy_recv_done_handler;
	atomic_add(2, &panic_done_count);
	rv = i_ipmi_request(NULL,
			    intf,
			    addr,
			    0,
			    msg,
			    intf,
			    &smi_msg,
			    &recv_msg,
			    0,
			    intf->channels[0].address,
			    intf->channels[0].lun,
			    0, 1); /* Don't retry, and don't wait. */
	if (rv)
		atomic_sub(2, &panic_done_count);
	while (atomic_read(&panic_done_count) != 0)
		ipmi_poll(intf);
}

#ifdef CONFIG_IPMI_PANIC_STRING
static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
	if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
	    && (msg->msg.netfn == IPMI_NETFN_SENSOR_EVENT_RESPONSE)
	    && (msg->msg.cmd == IPMI_GET_EVENT_RECEIVER_CMD)
	    && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
		/* A get event receiver command, save it. */
		intf->event_receiver = msg->msg.data[1];
		intf->event_receiver_lun = msg->msg.data[2] & 0x3;
	}
}

static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
	if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
	    && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
	    && (msg->msg.cmd == IPMI_GET_DEVICE_ID_CMD)
	    && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
		/*
		 * A get device id command, save if we are an event
		 * receiver or generator.
		 */
		intf->local_sel_device = (msg->msg.data[6] >> 2) & 1;
		intf->local_event_generator = (msg->msg.data[6] >> 5) & 1;
	}
}
#endif

static void send_panic_events(char *str)
{
	struct kernel_ipmi_msg            msg;
	ipmi_smi_t                        intf;
	unsigned char                     data[16];
	struct ipmi_system_interface_addr *si;
	struct ipmi_addr                  addr;

	si = (struct ipmi_system_interface_addr *) &addr;
	si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	si->channel = IPMI_BMC_CHANNEL;
	si->lun = 0;

	/* Fill in an event telling that we have failed. */
	msg.netfn = 0x04; /* Sensor or Event. */
	msg.cmd = 2; /* Platform event command. */
	msg.data = data;
	msg.data_len = 8;
	data[0] = 0x41; /* Kernel generator ID, IPMI table 5-4 */
	data[1] = 0x03; /* This is for IPMI 1.0. */
	data[2] = 0x20; /* OS Critical Stop, IPMI table 36-3 */
	data[4] = 0x6f; /* Sensor specific, IPMI table 36-1 */
	data[5] = 0xa1; /* Runtime stop OEM bytes 2 & 3. */

	/*
	 * Put a few breadcrumbs in.  Hopefully later we can add more things
	 * to make the panic events more useful.
	 */
	if (str) {
		data[3] = str[0];
		data[6] = str[1];
		data[7] = str[2];
	}

	/* For every registered interface, send the event. */
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		if (!intf->handlers)
			/* Interface is not ready. */
			continue;

		intf->run_to_completion = 1;
		/* Send the event announcing the panic. */
		intf->handlers->set_run_to_completion(intf->send_info, 1);
		ipmi_panic_request_and_wait(intf, &addr, &msg);
	}

#ifdef CONFIG_IPMI_PANIC_STRING
	/*
	 * On every interface, dump a bunch of OEM event holding the
	 * string.
	 */
	if (!str)
		return;

	/* For every registered interface, send the event. */
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		char                  *p = str;
		struct ipmi_ipmb_addr *ipmb;
		int                   j;

		if (intf->intf_num == -1)
			/* Interface was not ready yet. */
			continue;

		/*
		 * intf_num is used as an marker to tell if the
		 * interface is valid.  Thus we need a read barrier to
		 * make sure data fetched before checking intf_num
		 * won't be used.
		 */
		smp_rmb();

		/*
		 * First job here is to figure out where to send the
		 * OEM events.  There's no way in IPMI to send OEM
		 * events using an event send command, so we have to
		 * find the SEL to put them in and stick them in
		 * there.
		 */

		/* Get capabilities from the get device id. */
		intf->local_sel_device = 0;
		intf->local_event_generator = 0;
		intf->event_receiver = 0;

		/* Request the device info from the local MC. */
		msg.netfn = IPMI_NETFN_APP_REQUEST;
		msg.cmd = IPMI_GET_DEVICE_ID_CMD;
		msg.data = NULL;
		msg.data_len = 0;
		intf->null_user_handler = device_id_fetcher;
		ipmi_panic_request_and_wait(intf, &addr, &msg);

		if (intf->local_event_generator) {
			/* Request the event receiver from the local MC. */
			msg.netfn = IPMI_NETFN_SENSOR_EVENT_REQUEST;
			msg.cmd = IPMI_GET_EVENT_RECEIVER_CMD;
			msg.data = NULL;
			msg.data_len = 0;
			intf->null_user_handler = event_receiver_fetcher;
			ipmi_panic_request_and_wait(intf, &addr, &msg);
		}
		intf->null_user_handler = NULL;

		/*
		 * Validate the event receiver.  The low bit must not
		 * be 1 (it must be a valid IPMB address), it cannot
		 * be zero, and it must not be my address.
		 */
		if (((intf->event_receiver & 1) == 0)
		    && (intf->event_receiver != 0)
		    && (intf->event_receiver != intf->channels[0].address)) {
			/*
			 * The event receiver is valid, send an IPMB
			 * message.
			 */
			ipmb = (struct ipmi_ipmb_addr *) &addr;
			ipmb->addr_type = IPMI_IPMB_ADDR_TYPE;
			ipmb->channel = 0; /* FIXME - is this right? */
			ipmb->lun = intf->event_receiver_lun;
			ipmb->slave_addr = intf->event_receiver;
		} else if (intf->local_sel_device) {
			/*
			 * The event receiver was not valid (or was
			 * me), but I am an SEL device, just dump it
			 * in my SEL.
			 */
			si = (struct ipmi_system_interface_addr *) &addr;
			si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
			si->channel = IPMI_BMC_CHANNEL;
			si->lun = 0;
		} else
			continue; /* No where to send the event. */

		msg.netfn = IPMI_NETFN_STORAGE_REQUEST; /* Storage. */
		msg.cmd = IPMI_ADD_SEL_ENTRY_CMD;
		msg.data = data;
		msg.data_len = 16;

		j = 0;
		while (*p) {
			int size = strlen(p);

			if (size > 11)
				size = 11;
			data[0] = 0;
			data[1] = 0;
			data[2] = 0xf0; /* OEM event without timestamp. */
			data[3] = intf->channels[0].address;
			data[4] = j++; /* sequence # */
			/*
			 * Always give 11 bytes, so strncpy will fill
			 * it with zeroes for me.
			 */
			strncpy(data+5, p, 11);
			p += size;

			ipmi_panic_request_and_wait(intf, &addr, &msg);
		}
	}
#endif /* CONFIG_IPMI_PANIC_STRING */
}
#endif /* CONFIG_IPMI_PANIC_EVENT */

static int has_panicked;

static int panic_event(struct notifier_block *this,
		       unsigned long         event,
		       void                  *ptr)
{
	ipmi_smi_t intf;

	if (has_panicked)
		return NOTIFY_DONE;
	has_panicked = 1;

	/* For every registered interface, set it to run to completion. */
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		if (!intf->handlers)
			/* Interface is not ready. */
			continue;

		intf->run_to_completion = 1;
		intf->handlers->set_run_to_completion(intf->send_info, 1);
	}

#ifdef CONFIG_IPMI_PANIC_EVENT
	send_panic_events(ptr);
#endif

	return NOTIFY_DONE;
}

static struct notifier_block panic_block = {
	.notifier_call	= panic_event,
	.next		= NULL,
	.priority	= 200	/* priority: INT_MAX >= x >= 0 */
};

static int ipmi_init_msghandler(void)
{
	int rv;

	if (initialized)
		return 0;

	rv = driver_register(&ipmidriver.driver);
	if (rv) {
		printk(KERN_ERR PFX "Could not register IPMI driver\n");
		return rv;
	}

	printk(KERN_INFO "ipmi message handler version "
	       IPMI_DRIVER_VERSION "\n");

#ifdef CONFIG_PROC_FS
	proc_ipmi_root = proc_mkdir("ipmi", NULL);
	if (!proc_ipmi_root) {
	    printk(KERN_ERR PFX "Unable to create IPMI proc dir");
	    return -ENOMEM;
	}

#endif /* CONFIG_PROC_FS */

	setup_timer(&ipmi_timer, ipmi_timeout, 0);
	mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);

	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);

	initialized = 1;

	return 0;
}

static int __init ipmi_init_msghandler_mod(void)
{
	ipmi_init_msghandler();
	return 0;
}

static void __exit cleanup_ipmi(void)
{
	int count;

	if (!initialized)
		return;

	atomic_notifier_chain_unregister(&panic_notifier_list, &panic_block);

	/*
	 * This can't be called if any interfaces exist, so no worry
	 * about shutting down the interfaces.
	 */

	/*
	 * Tell the timer to stop, then wait for it to stop.  This
	 * avoids problems with race conditions removing the timer
	 * here.
	 */
	atomic_inc(&stop_operation);
	del_timer_sync(&ipmi_timer);

#ifdef CONFIG_PROC_FS
	proc_remove(proc_ipmi_root);
#endif /* CONFIG_PROC_FS */

	driver_unregister(&ipmidriver.driver);

	initialized = 0;

	/* Check for buffer leaks. */
	count = atomic_read(&smi_msg_inuse_count);
	if (count != 0)
		printk(KERN_WARNING PFX "SMI message count %d at exit\n",
		       count);
	count = atomic_read(&recv_msg_inuse_count);
	if (count != 0)
		printk(KERN_WARNING PFX "recv message count %d at exit\n",
		       count);
}
module_exit(cleanup_ipmi);

module_init(ipmi_init_msghandler_mod);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
MODULE_DESCRIPTION("Incoming and outgoing message routing for an IPMI"
		   " interface.");
MODULE_VERSION(IPMI_DRIVER_VERSION);
OpenPOWER on IntegriCloud