summaryrefslogtreecommitdiffstats
path: root/drivers/iommu/amd/init.c
blob: 232683ea10e0b74c74e451833c717a3186f50d06 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
 * Author: Joerg Roedel <jroedel@suse.de>
 *         Leo Duran <leo.duran@amd.com>
 */

#define pr_fmt(fmt)     "AMD-Vi: " fmt
#define dev_fmt(fmt)    pr_fmt(fmt)

#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/list.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
#include <linux/syscore_ops.h>
#include <linux/interrupt.h>
#include <linux/msi.h>
#include <linux/amd-iommu.h>
#include <linux/export.h>
#include <linux/kmemleak.h>
#include <linux/mem_encrypt.h>
#include <asm/pci-direct.h>
#include <asm/iommu.h>
#include <asm/apic.h>
#include <asm/msidef.h>
#include <asm/gart.h>
#include <asm/x86_init.h>
#include <asm/iommu_table.h>
#include <asm/io_apic.h>
#include <asm/irq_remapping.h>

#include <linux/crash_dump.h>

#include "amd_iommu.h"
#include "../irq_remapping.h"

/*
 * definitions for the ACPI scanning code
 */
#define IVRS_HEADER_LENGTH 48

#define ACPI_IVHD_TYPE_MAX_SUPPORTED	0x40
#define ACPI_IVMD_TYPE_ALL              0x20
#define ACPI_IVMD_TYPE                  0x21
#define ACPI_IVMD_TYPE_RANGE            0x22

#define IVHD_DEV_ALL                    0x01
#define IVHD_DEV_SELECT                 0x02
#define IVHD_DEV_SELECT_RANGE_START     0x03
#define IVHD_DEV_RANGE_END              0x04
#define IVHD_DEV_ALIAS                  0x42
#define IVHD_DEV_ALIAS_RANGE            0x43
#define IVHD_DEV_EXT_SELECT             0x46
#define IVHD_DEV_EXT_SELECT_RANGE       0x47
#define IVHD_DEV_SPECIAL		0x48
#define IVHD_DEV_ACPI_HID		0xf0

#define UID_NOT_PRESENT                 0
#define UID_IS_INTEGER                  1
#define UID_IS_CHARACTER                2

#define IVHD_SPECIAL_IOAPIC		1
#define IVHD_SPECIAL_HPET		2

#define IVHD_FLAG_HT_TUN_EN_MASK        0x01
#define IVHD_FLAG_PASSPW_EN_MASK        0x02
#define IVHD_FLAG_RESPASSPW_EN_MASK     0x04
#define IVHD_FLAG_ISOC_EN_MASK          0x08

#define IVMD_FLAG_EXCL_RANGE            0x08
#define IVMD_FLAG_IW                    0x04
#define IVMD_FLAG_IR                    0x02
#define IVMD_FLAG_UNITY_MAP             0x01

#define ACPI_DEVFLAG_INITPASS           0x01
#define ACPI_DEVFLAG_EXTINT             0x02
#define ACPI_DEVFLAG_NMI                0x04
#define ACPI_DEVFLAG_SYSMGT1            0x10
#define ACPI_DEVFLAG_SYSMGT2            0x20
#define ACPI_DEVFLAG_LINT0              0x40
#define ACPI_DEVFLAG_LINT1              0x80
#define ACPI_DEVFLAG_ATSDIS             0x10000000

#define LOOP_TIMEOUT	100000
/*
 * ACPI table definitions
 *
 * These data structures are laid over the table to parse the important values
 * out of it.
 */

extern const struct iommu_ops amd_iommu_ops;

/*
 * structure describing one IOMMU in the ACPI table. Typically followed by one
 * or more ivhd_entrys.
 */
struct ivhd_header {
	u8 type;
	u8 flags;
	u16 length;
	u16 devid;
	u16 cap_ptr;
	u64 mmio_phys;
	u16 pci_seg;
	u16 info;
	u32 efr_attr;

	/* Following only valid on IVHD type 11h and 40h */
	u64 efr_reg; /* Exact copy of MMIO_EXT_FEATURES */
	u64 res;
} __attribute__((packed));

/*
 * A device entry describing which devices a specific IOMMU translates and
 * which requestor ids they use.
 */
struct ivhd_entry {
	u8 type;
	u16 devid;
	u8 flags;
	u32 ext;
	u32 hidh;
	u64 cid;
	u8 uidf;
	u8 uidl;
	u8 uid;
} __attribute__((packed));

/*
 * An AMD IOMMU memory definition structure. It defines things like exclusion
 * ranges for devices and regions that should be unity mapped.
 */
struct ivmd_header {
	u8 type;
	u8 flags;
	u16 length;
	u16 devid;
	u16 aux;
	u64 resv;
	u64 range_start;
	u64 range_length;
} __attribute__((packed));

bool amd_iommu_dump;
bool amd_iommu_irq_remap __read_mostly;

int amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC;
static int amd_iommu_xt_mode = IRQ_REMAP_XAPIC_MODE;

static bool amd_iommu_detected;
static bool __initdata amd_iommu_disabled;
static int amd_iommu_target_ivhd_type;

u16 amd_iommu_last_bdf;			/* largest PCI device id we have
					   to handle */
LIST_HEAD(amd_iommu_unity_map);		/* a list of required unity mappings
					   we find in ACPI */
bool amd_iommu_unmap_flush;		/* if true, flush on every unmap */

LIST_HEAD(amd_iommu_list);		/* list of all AMD IOMMUs in the
					   system */

/* Array to assign indices to IOMMUs*/
struct amd_iommu *amd_iommus[MAX_IOMMUS];

/* Number of IOMMUs present in the system */
static int amd_iommus_present;

/* IOMMUs have a non-present cache? */
bool amd_iommu_np_cache __read_mostly;
bool amd_iommu_iotlb_sup __read_mostly = true;

u32 amd_iommu_max_pasid __read_mostly = ~0;

bool amd_iommu_v2_present __read_mostly;
static bool amd_iommu_pc_present __read_mostly;

bool amd_iommu_force_isolation __read_mostly;

/*
 * Pointer to the device table which is shared by all AMD IOMMUs
 * it is indexed by the PCI device id or the HT unit id and contains
 * information about the domain the device belongs to as well as the
 * page table root pointer.
 */
struct dev_table_entry *amd_iommu_dev_table;
/*
 * Pointer to a device table which the content of old device table
 * will be copied to. It's only be used in kdump kernel.
 */
static struct dev_table_entry *old_dev_tbl_cpy;

/*
 * The alias table is a driver specific data structure which contains the
 * mappings of the PCI device ids to the actual requestor ids on the IOMMU.
 * More than one device can share the same requestor id.
 */
u16 *amd_iommu_alias_table;

/*
 * The rlookup table is used to find the IOMMU which is responsible
 * for a specific device. It is also indexed by the PCI device id.
 */
struct amd_iommu **amd_iommu_rlookup_table;
EXPORT_SYMBOL(amd_iommu_rlookup_table);

/*
 * This table is used to find the irq remapping table for a given device id
 * quickly.
 */
struct irq_remap_table **irq_lookup_table;

/*
 * AMD IOMMU allows up to 2^16 different protection domains. This is a bitmap
 * to know which ones are already in use.
 */
unsigned long *amd_iommu_pd_alloc_bitmap;

static u32 dev_table_size;	/* size of the device table */
static u32 alias_table_size;	/* size of the alias table */
static u32 rlookup_table_size;	/* size if the rlookup table */

enum iommu_init_state {
	IOMMU_START_STATE,
	IOMMU_IVRS_DETECTED,
	IOMMU_ACPI_FINISHED,
	IOMMU_ENABLED,
	IOMMU_PCI_INIT,
	IOMMU_INTERRUPTS_EN,
	IOMMU_DMA_OPS,
	IOMMU_INITIALIZED,
	IOMMU_NOT_FOUND,
	IOMMU_INIT_ERROR,
	IOMMU_CMDLINE_DISABLED,
};

/* Early ioapic and hpet maps from kernel command line */
#define EARLY_MAP_SIZE		4
static struct devid_map __initdata early_ioapic_map[EARLY_MAP_SIZE];
static struct devid_map __initdata early_hpet_map[EARLY_MAP_SIZE];
static struct acpihid_map_entry __initdata early_acpihid_map[EARLY_MAP_SIZE];

static int __initdata early_ioapic_map_size;
static int __initdata early_hpet_map_size;
static int __initdata early_acpihid_map_size;

static bool __initdata cmdline_maps;

static enum iommu_init_state init_state = IOMMU_START_STATE;

static int amd_iommu_enable_interrupts(void);
static int __init iommu_go_to_state(enum iommu_init_state state);
static void init_device_table_dma(void);

static bool amd_iommu_pre_enabled = true;

bool translation_pre_enabled(struct amd_iommu *iommu)
{
	return (iommu->flags & AMD_IOMMU_FLAG_TRANS_PRE_ENABLED);
}
EXPORT_SYMBOL(translation_pre_enabled);

static void clear_translation_pre_enabled(struct amd_iommu *iommu)
{
	iommu->flags &= ~AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
}

static void init_translation_status(struct amd_iommu *iommu)
{
	u64 ctrl;

	ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
	if (ctrl & (1<<CONTROL_IOMMU_EN))
		iommu->flags |= AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
}

static inline void update_last_devid(u16 devid)
{
	if (devid > amd_iommu_last_bdf)
		amd_iommu_last_bdf = devid;
}

static inline unsigned long tbl_size(int entry_size)
{
	unsigned shift = PAGE_SHIFT +
			 get_order(((int)amd_iommu_last_bdf + 1) * entry_size);

	return 1UL << shift;
}

int amd_iommu_get_num_iommus(void)
{
	return amd_iommus_present;
}

/* Access to l1 and l2 indexed register spaces */

static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address)
{
	u32 val;

	pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
	pci_read_config_dword(iommu->dev, 0xfc, &val);
	return val;
}

static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val)
{
	pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31));
	pci_write_config_dword(iommu->dev, 0xfc, val);
	pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
}

static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address)
{
	u32 val;

	pci_write_config_dword(iommu->dev, 0xf0, address);
	pci_read_config_dword(iommu->dev, 0xf4, &val);
	return val;
}

static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
{
	pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8));
	pci_write_config_dword(iommu->dev, 0xf4, val);
}

/****************************************************************************
 *
 * AMD IOMMU MMIO register space handling functions
 *
 * These functions are used to program the IOMMU device registers in
 * MMIO space required for that driver.
 *
 ****************************************************************************/

/*
 * This function set the exclusion range in the IOMMU. DMA accesses to the
 * exclusion range are passed through untranslated
 */
static void iommu_set_exclusion_range(struct amd_iommu *iommu)
{
	u64 start = iommu->exclusion_start & PAGE_MASK;
	u64 limit = (start + iommu->exclusion_length - 1) & PAGE_MASK;
	u64 entry;

	if (!iommu->exclusion_start)
		return;

	entry = start | MMIO_EXCL_ENABLE_MASK;
	memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
			&entry, sizeof(entry));

	entry = limit;
	memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
			&entry, sizeof(entry));
}

/* Programs the physical address of the device table into the IOMMU hardware */
static void iommu_set_device_table(struct amd_iommu *iommu)
{
	u64 entry;

	BUG_ON(iommu->mmio_base == NULL);

	entry = iommu_virt_to_phys(amd_iommu_dev_table);
	entry |= (dev_table_size >> 12) - 1;
	memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
			&entry, sizeof(entry));
}

/* Generic functions to enable/disable certain features of the IOMMU. */
static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
{
	u64 ctrl;

	ctrl = readq(iommu->mmio_base +  MMIO_CONTROL_OFFSET);
	ctrl |= (1ULL << bit);
	writeq(ctrl, iommu->mmio_base +  MMIO_CONTROL_OFFSET);
}

static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
{
	u64 ctrl;

	ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
	ctrl &= ~(1ULL << bit);
	writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
}

static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout)
{
	u64 ctrl;

	ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
	ctrl &= ~CTRL_INV_TO_MASK;
	ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK;
	writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
}

/* Function to enable the hardware */
static void iommu_enable(struct amd_iommu *iommu)
{
	iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
}

static void iommu_disable(struct amd_iommu *iommu)
{
	if (!iommu->mmio_base)
		return;

	/* Disable command buffer */
	iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);

	/* Disable event logging and event interrupts */
	iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
	iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);

	/* Disable IOMMU GA_LOG */
	iommu_feature_disable(iommu, CONTROL_GALOG_EN);
	iommu_feature_disable(iommu, CONTROL_GAINT_EN);

	/* Disable IOMMU hardware itself */
	iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
}

/*
 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
 * the system has one.
 */
static u8 __iomem * __init iommu_map_mmio_space(u64 address, u64 end)
{
	if (!request_mem_region(address, end, "amd_iommu")) {
		pr_err("Can not reserve memory region %llx-%llx for mmio\n",
			address, end);
		pr_err("This is a BIOS bug. Please contact your hardware vendor\n");
		return NULL;
	}

	return (u8 __iomem *)ioremap(address, end);
}

static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
{
	if (iommu->mmio_base)
		iounmap(iommu->mmio_base);
	release_mem_region(iommu->mmio_phys, iommu->mmio_phys_end);
}

static inline u32 get_ivhd_header_size(struct ivhd_header *h)
{
	u32 size = 0;

	switch (h->type) {
	case 0x10:
		size = 24;
		break;
	case 0x11:
	case 0x40:
		size = 40;
		break;
	}
	return size;
}

/****************************************************************************
 *
 * The functions below belong to the first pass of AMD IOMMU ACPI table
 * parsing. In this pass we try to find out the highest device id this
 * code has to handle. Upon this information the size of the shared data
 * structures is determined later.
 *
 ****************************************************************************/

/*
 * This function calculates the length of a given IVHD entry
 */
static inline int ivhd_entry_length(u8 *ivhd)
{
	u32 type = ((struct ivhd_entry *)ivhd)->type;

	if (type < 0x80) {
		return 0x04 << (*ivhd >> 6);
	} else if (type == IVHD_DEV_ACPI_HID) {
		/* For ACPI_HID, offset 21 is uid len */
		return *((u8 *)ivhd + 21) + 22;
	}
	return 0;
}

/*
 * After reading the highest device id from the IOMMU PCI capability header
 * this function looks if there is a higher device id defined in the ACPI table
 */
static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
{
	u8 *p = (void *)h, *end = (void *)h;
	struct ivhd_entry *dev;

	u32 ivhd_size = get_ivhd_header_size(h);

	if (!ivhd_size) {
		pr_err("Unsupported IVHD type %#x\n", h->type);
		return -EINVAL;
	}

	p += ivhd_size;
	end += h->length;

	while (p < end) {
		dev = (struct ivhd_entry *)p;
		switch (dev->type) {
		case IVHD_DEV_ALL:
			/* Use maximum BDF value for DEV_ALL */
			update_last_devid(0xffff);
			break;
		case IVHD_DEV_SELECT:
		case IVHD_DEV_RANGE_END:
		case IVHD_DEV_ALIAS:
		case IVHD_DEV_EXT_SELECT:
			/* all the above subfield types refer to device ids */
			update_last_devid(dev->devid);
			break;
		default:
			break;
		}
		p += ivhd_entry_length(p);
	}

	WARN_ON(p != end);

	return 0;
}

static int __init check_ivrs_checksum(struct acpi_table_header *table)
{
	int i;
	u8 checksum = 0, *p = (u8 *)table;

	for (i = 0; i < table->length; ++i)
		checksum += p[i];
	if (checksum != 0) {
		/* ACPI table corrupt */
		pr_err(FW_BUG "IVRS invalid checksum\n");
		return -ENODEV;
	}

	return 0;
}

/*
 * Iterate over all IVHD entries in the ACPI table and find the highest device
 * id which we need to handle. This is the first of three functions which parse
 * the ACPI table. So we check the checksum here.
 */
static int __init find_last_devid_acpi(struct acpi_table_header *table)
{
	u8 *p = (u8 *)table, *end = (u8 *)table;
	struct ivhd_header *h;

	p += IVRS_HEADER_LENGTH;

	end += table->length;
	while (p < end) {
		h = (struct ivhd_header *)p;
		if (h->type == amd_iommu_target_ivhd_type) {
			int ret = find_last_devid_from_ivhd(h);

			if (ret)
				return ret;
		}
		p += h->length;
	}
	WARN_ON(p != end);

	return 0;
}

/****************************************************************************
 *
 * The following functions belong to the code path which parses the ACPI table
 * the second time. In this ACPI parsing iteration we allocate IOMMU specific
 * data structures, initialize the device/alias/rlookup table and also
 * basically initialize the hardware.
 *
 ****************************************************************************/

/*
 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
 * write commands to that buffer later and the IOMMU will execute them
 * asynchronously
 */
static int __init alloc_command_buffer(struct amd_iommu *iommu)
{
	iommu->cmd_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
						  get_order(CMD_BUFFER_SIZE));

	return iommu->cmd_buf ? 0 : -ENOMEM;
}

/*
 * This function resets the command buffer if the IOMMU stopped fetching
 * commands from it.
 */
void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
{
	iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);

	writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
	writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
	iommu->cmd_buf_head = 0;
	iommu->cmd_buf_tail = 0;

	iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
}

/*
 * This function writes the command buffer address to the hardware and
 * enables it.
 */
static void iommu_enable_command_buffer(struct amd_iommu *iommu)
{
	u64 entry;

	BUG_ON(iommu->cmd_buf == NULL);

	entry = iommu_virt_to_phys(iommu->cmd_buf);
	entry |= MMIO_CMD_SIZE_512;

	memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
		    &entry, sizeof(entry));

	amd_iommu_reset_cmd_buffer(iommu);
}

/*
 * This function disables the command buffer
 */
static void iommu_disable_command_buffer(struct amd_iommu *iommu)
{
	iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
}

static void __init free_command_buffer(struct amd_iommu *iommu)
{
	free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
}

/* allocates the memory where the IOMMU will log its events to */
static int __init alloc_event_buffer(struct amd_iommu *iommu)
{
	iommu->evt_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
						  get_order(EVT_BUFFER_SIZE));

	return iommu->evt_buf ? 0 : -ENOMEM;
}

static void iommu_enable_event_buffer(struct amd_iommu *iommu)
{
	u64 entry;

	BUG_ON(iommu->evt_buf == NULL);

	entry = iommu_virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;

	memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
		    &entry, sizeof(entry));

	/* set head and tail to zero manually */
	writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
	writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);

	iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
}

/*
 * This function disables the event log buffer
 */
static void iommu_disable_event_buffer(struct amd_iommu *iommu)
{
	iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
}

static void __init free_event_buffer(struct amd_iommu *iommu)
{
	free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
}

/* allocates the memory where the IOMMU will log its events to */
static int __init alloc_ppr_log(struct amd_iommu *iommu)
{
	iommu->ppr_log = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
						  get_order(PPR_LOG_SIZE));

	return iommu->ppr_log ? 0 : -ENOMEM;
}

static void iommu_enable_ppr_log(struct amd_iommu *iommu)
{
	u64 entry;

	if (iommu->ppr_log == NULL)
		return;

	entry = iommu_virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512;

	memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET,
		    &entry, sizeof(entry));

	/* set head and tail to zero manually */
	writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
	writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);

	iommu_feature_enable(iommu, CONTROL_PPRLOG_EN);
	iommu_feature_enable(iommu, CONTROL_PPR_EN);
}

static void __init free_ppr_log(struct amd_iommu *iommu)
{
	if (iommu->ppr_log == NULL)
		return;

	free_pages((unsigned long)iommu->ppr_log, get_order(PPR_LOG_SIZE));
}

static void free_ga_log(struct amd_iommu *iommu)
{
#ifdef CONFIG_IRQ_REMAP
	if (iommu->ga_log)
		free_pages((unsigned long)iommu->ga_log,
			    get_order(GA_LOG_SIZE));
	if (iommu->ga_log_tail)
		free_pages((unsigned long)iommu->ga_log_tail,
			    get_order(8));
#endif
}

static int iommu_ga_log_enable(struct amd_iommu *iommu)
{
#ifdef CONFIG_IRQ_REMAP
	u32 status, i;

	if (!iommu->ga_log)
		return -EINVAL;

	status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);

	/* Check if already running */
	if (status & (MMIO_STATUS_GALOG_RUN_MASK))
		return 0;

	iommu_feature_enable(iommu, CONTROL_GAINT_EN);
	iommu_feature_enable(iommu, CONTROL_GALOG_EN);

	for (i = 0; i < LOOP_TIMEOUT; ++i) {
		status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
		if (status & (MMIO_STATUS_GALOG_RUN_MASK))
			break;
	}

	if (i >= LOOP_TIMEOUT)
		return -EINVAL;
#endif /* CONFIG_IRQ_REMAP */
	return 0;
}

#ifdef CONFIG_IRQ_REMAP
static int iommu_init_ga_log(struct amd_iommu *iommu)
{
	u64 entry;

	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
		return 0;

	iommu->ga_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
					get_order(GA_LOG_SIZE));
	if (!iommu->ga_log)
		goto err_out;

	iommu->ga_log_tail = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
					get_order(8));
	if (!iommu->ga_log_tail)
		goto err_out;

	entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512;
	memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET,
		    &entry, sizeof(entry));
	entry = (iommu_virt_to_phys(iommu->ga_log_tail) &
		 (BIT_ULL(52)-1)) & ~7ULL;
	memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET,
		    &entry, sizeof(entry));
	writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
	writel(0x00, iommu->mmio_base + MMIO_GA_TAIL_OFFSET);

	return 0;
err_out:
	free_ga_log(iommu);
	return -EINVAL;
}
#endif /* CONFIG_IRQ_REMAP */

static int iommu_init_ga(struct amd_iommu *iommu)
{
	int ret = 0;

#ifdef CONFIG_IRQ_REMAP
	/* Note: We have already checked GASup from IVRS table.
	 *       Now, we need to make sure that GAMSup is set.
	 */
	if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
	    !iommu_feature(iommu, FEATURE_GAM_VAPIC))
		amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;

	ret = iommu_init_ga_log(iommu);
#endif /* CONFIG_IRQ_REMAP */

	return ret;
}

static void iommu_enable_xt(struct amd_iommu *iommu)
{
#ifdef CONFIG_IRQ_REMAP
	/*
	 * XT mode (32-bit APIC destination ID) requires
	 * GA mode (128-bit IRTE support) as a prerequisite.
	 */
	if (AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir) &&
	    amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
		iommu_feature_enable(iommu, CONTROL_XT_EN);
#endif /* CONFIG_IRQ_REMAP */
}

static void iommu_enable_gt(struct amd_iommu *iommu)
{
	if (!iommu_feature(iommu, FEATURE_GT))
		return;

	iommu_feature_enable(iommu, CONTROL_GT_EN);
}

/* sets a specific bit in the device table entry. */
static void set_dev_entry_bit(u16 devid, u8 bit)
{
	int i = (bit >> 6) & 0x03;
	int _bit = bit & 0x3f;

	amd_iommu_dev_table[devid].data[i] |= (1UL << _bit);
}

static int get_dev_entry_bit(u16 devid, u8 bit)
{
	int i = (bit >> 6) & 0x03;
	int _bit = bit & 0x3f;

	return (amd_iommu_dev_table[devid].data[i] & (1UL << _bit)) >> _bit;
}


static bool copy_device_table(void)
{
	u64 int_ctl, int_tab_len, entry = 0, last_entry = 0;
	struct dev_table_entry *old_devtb = NULL;
	u32 lo, hi, devid, old_devtb_size;
	phys_addr_t old_devtb_phys;
	struct amd_iommu *iommu;
	u16 dom_id, dte_v, irq_v;
	gfp_t gfp_flag;
	u64 tmp;

	if (!amd_iommu_pre_enabled)
		return false;

	pr_warn("Translation is already enabled - trying to copy translation structures\n");
	for_each_iommu(iommu) {
		/* All IOMMUs should use the same device table with the same size */
		lo = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET);
		hi = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET + 4);
		entry = (((u64) hi) << 32) + lo;
		if (last_entry && last_entry != entry) {
			pr_err("IOMMU:%d should use the same dev table as others!\n",
				iommu->index);
			return false;
		}
		last_entry = entry;

		old_devtb_size = ((entry & ~PAGE_MASK) + 1) << 12;
		if (old_devtb_size != dev_table_size) {
			pr_err("The device table size of IOMMU:%d is not expected!\n",
				iommu->index);
			return false;
		}
	}

	/*
	 * When SME is enabled in the first kernel, the entry includes the
	 * memory encryption mask(sme_me_mask), we must remove the memory
	 * encryption mask to obtain the true physical address in kdump kernel.
	 */
	old_devtb_phys = __sme_clr(entry) & PAGE_MASK;

	if (old_devtb_phys >= 0x100000000ULL) {
		pr_err("The address of old device table is above 4G, not trustworthy!\n");
		return false;
	}
	old_devtb = (sme_active() && is_kdump_kernel())
		    ? (__force void *)ioremap_encrypted(old_devtb_phys,
							dev_table_size)
		    : memremap(old_devtb_phys, dev_table_size, MEMREMAP_WB);

	if (!old_devtb)
		return false;

	gfp_flag = GFP_KERNEL | __GFP_ZERO | GFP_DMA32;
	old_dev_tbl_cpy = (void *)__get_free_pages(gfp_flag,
				get_order(dev_table_size));
	if (old_dev_tbl_cpy == NULL) {
		pr_err("Failed to allocate memory for copying old device table!\n");
		return false;
	}

	for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
		old_dev_tbl_cpy[devid] = old_devtb[devid];
		dom_id = old_devtb[devid].data[1] & DEV_DOMID_MASK;
		dte_v = old_devtb[devid].data[0] & DTE_FLAG_V;

		if (dte_v && dom_id) {
			old_dev_tbl_cpy[devid].data[0] = old_devtb[devid].data[0];
			old_dev_tbl_cpy[devid].data[1] = old_devtb[devid].data[1];
			__set_bit(dom_id, amd_iommu_pd_alloc_bitmap);
			/* If gcr3 table existed, mask it out */
			if (old_devtb[devid].data[0] & DTE_FLAG_GV) {
				tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
				tmp |= DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
				old_dev_tbl_cpy[devid].data[1] &= ~tmp;
				tmp = DTE_GCR3_VAL_A(~0ULL) << DTE_GCR3_SHIFT_A;
				tmp |= DTE_FLAG_GV;
				old_dev_tbl_cpy[devid].data[0] &= ~tmp;
			}
		}

		irq_v = old_devtb[devid].data[2] & DTE_IRQ_REMAP_ENABLE;
		int_ctl = old_devtb[devid].data[2] & DTE_IRQ_REMAP_INTCTL_MASK;
		int_tab_len = old_devtb[devid].data[2] & DTE_IRQ_TABLE_LEN_MASK;
		if (irq_v && (int_ctl || int_tab_len)) {
			if ((int_ctl != DTE_IRQ_REMAP_INTCTL) ||
			    (int_tab_len != DTE_IRQ_TABLE_LEN)) {
				pr_err("Wrong old irq remapping flag: %#x\n", devid);
				return false;
			}

		        old_dev_tbl_cpy[devid].data[2] = old_devtb[devid].data[2];
		}
	}
	memunmap(old_devtb);

	return true;
}

void amd_iommu_apply_erratum_63(u16 devid)
{
	int sysmgt;

	sysmgt = get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1) |
		 (get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2) << 1);

	if (sysmgt == 0x01)
		set_dev_entry_bit(devid, DEV_ENTRY_IW);
}

/* Writes the specific IOMMU for a device into the rlookup table */
static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
{
	amd_iommu_rlookup_table[devid] = iommu;
}

/*
 * This function takes the device specific flags read from the ACPI
 * table and sets up the device table entry with that information
 */
static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
					   u16 devid, u32 flags, u32 ext_flags)
{
	if (flags & ACPI_DEVFLAG_INITPASS)
		set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS);
	if (flags & ACPI_DEVFLAG_EXTINT)
		set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS);
	if (flags & ACPI_DEVFLAG_NMI)
		set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS);
	if (flags & ACPI_DEVFLAG_SYSMGT1)
		set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1);
	if (flags & ACPI_DEVFLAG_SYSMGT2)
		set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2);
	if (flags & ACPI_DEVFLAG_LINT0)
		set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS);
	if (flags & ACPI_DEVFLAG_LINT1)
		set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);

	amd_iommu_apply_erratum_63(devid);

	set_iommu_for_device(iommu, devid);
}

int __init add_special_device(u8 type, u8 id, u16 *devid, bool cmd_line)
{
	struct devid_map *entry;
	struct list_head *list;

	if (type == IVHD_SPECIAL_IOAPIC)
		list = &ioapic_map;
	else if (type == IVHD_SPECIAL_HPET)
		list = &hpet_map;
	else
		return -EINVAL;

	list_for_each_entry(entry, list, list) {
		if (!(entry->id == id && entry->cmd_line))
			continue;

		pr_info("Command-line override present for %s id %d - ignoring\n",
			type == IVHD_SPECIAL_IOAPIC ? "IOAPIC" : "HPET", id);

		*devid = entry->devid;

		return 0;
	}

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

	entry->id	= id;
	entry->devid	= *devid;
	entry->cmd_line	= cmd_line;

	list_add_tail(&entry->list, list);

	return 0;
}

static int __init add_acpi_hid_device(u8 *hid, u8 *uid, u16 *devid,
				      bool cmd_line)
{
	struct acpihid_map_entry *entry;
	struct list_head *list = &acpihid_map;

	list_for_each_entry(entry, list, list) {
		if (strcmp(entry->hid, hid) ||
		    (*uid && *entry->uid && strcmp(entry->uid, uid)) ||
		    !entry->cmd_line)
			continue;

		pr_info("Command-line override for hid:%s uid:%s\n",
			hid, uid);
		*devid = entry->devid;
		return 0;
	}

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

	memcpy(entry->uid, uid, strlen(uid));
	memcpy(entry->hid, hid, strlen(hid));
	entry->devid = *devid;
	entry->cmd_line	= cmd_line;
	entry->root_devid = (entry->devid & (~0x7));

	pr_info("%s, add hid:%s, uid:%s, rdevid:%d\n",
		entry->cmd_line ? "cmd" : "ivrs",
		entry->hid, entry->uid, entry->root_devid);

	list_add_tail(&entry->list, list);
	return 0;
}

static int __init add_early_maps(void)
{
	int i, ret;

	for (i = 0; i < early_ioapic_map_size; ++i) {
		ret = add_special_device(IVHD_SPECIAL_IOAPIC,
					 early_ioapic_map[i].id,
					 &early_ioapic_map[i].devid,
					 early_ioapic_map[i].cmd_line);
		if (ret)
			return ret;
	}

	for (i = 0; i < early_hpet_map_size; ++i) {
		ret = add_special_device(IVHD_SPECIAL_HPET,
					 early_hpet_map[i].id,
					 &early_hpet_map[i].devid,
					 early_hpet_map[i].cmd_line);
		if (ret)
			return ret;
	}

	for (i = 0; i < early_acpihid_map_size; ++i) {
		ret = add_acpi_hid_device(early_acpihid_map[i].hid,
					  early_acpihid_map[i].uid,
					  &early_acpihid_map[i].devid,
					  early_acpihid_map[i].cmd_line);
		if (ret)
			return ret;
	}

	return 0;
}

/*
 * Reads the device exclusion range from ACPI and initializes the IOMMU with
 * it
 */
static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
{
	if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
		return;

	/*
	 * Treat per-device exclusion ranges as r/w unity-mapped regions
	 * since some buggy BIOSes might lead to the overwritten exclusion
	 * range (exclusion_start and exclusion_length members). This
	 * happens when there are multiple exclusion ranges (IVMD entries)
	 * defined in ACPI table.
	 */
	m->flags = (IVMD_FLAG_IW | IVMD_FLAG_IR | IVMD_FLAG_UNITY_MAP);
}

/*
 * Takes a pointer to an AMD IOMMU entry in the ACPI table and
 * initializes the hardware and our data structures with it.
 */
static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
					struct ivhd_header *h)
{
	u8 *p = (u8 *)h;
	u8 *end = p, flags = 0;
	u16 devid = 0, devid_start = 0, devid_to = 0;
	u32 dev_i, ext_flags = 0;
	bool alias = false;
	struct ivhd_entry *e;
	u32 ivhd_size;
	int ret;


	ret = add_early_maps();
	if (ret)
		return ret;

	amd_iommu_apply_ivrs_quirks();

	/*
	 * First save the recommended feature enable bits from ACPI
	 */
	iommu->acpi_flags = h->flags;

	/*
	 * Done. Now parse the device entries
	 */
	ivhd_size = get_ivhd_header_size(h);
	if (!ivhd_size) {
		pr_err("Unsupported IVHD type %#x\n", h->type);
		return -EINVAL;
	}

	p += ivhd_size;

	end += h->length;


	while (p < end) {
		e = (struct ivhd_entry *)p;
		switch (e->type) {
		case IVHD_DEV_ALL:

			DUMP_printk("  DEV_ALL\t\t\tflags: %02x\n", e->flags);

			for (dev_i = 0; dev_i <= amd_iommu_last_bdf; ++dev_i)
				set_dev_entry_from_acpi(iommu, dev_i, e->flags, 0);
			break;
		case IVHD_DEV_SELECT:

			DUMP_printk("  DEV_SELECT\t\t\t devid: %02x:%02x.%x "
				    "flags: %02x\n",
				    PCI_BUS_NUM(e->devid),
				    PCI_SLOT(e->devid),
				    PCI_FUNC(e->devid),
				    e->flags);

			devid = e->devid;
			set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
			break;
		case IVHD_DEV_SELECT_RANGE_START:

			DUMP_printk("  DEV_SELECT_RANGE_START\t "
				    "devid: %02x:%02x.%x flags: %02x\n",
				    PCI_BUS_NUM(e->devid),
				    PCI_SLOT(e->devid),
				    PCI_FUNC(e->devid),
				    e->flags);

			devid_start = e->devid;
			flags = e->flags;
			ext_flags = 0;
			alias = false;
			break;
		case IVHD_DEV_ALIAS:

			DUMP_printk("  DEV_ALIAS\t\t\t devid: %02x:%02x.%x "
				    "flags: %02x devid_to: %02x:%02x.%x\n",
				    PCI_BUS_NUM(e->devid),
				    PCI_SLOT(e->devid),
				    PCI_FUNC(e->devid),
				    e->flags,
				    PCI_BUS_NUM(e->ext >> 8),
				    PCI_SLOT(e->ext >> 8),
				    PCI_FUNC(e->ext >> 8));

			devid = e->devid;
			devid_to = e->ext >> 8;
			set_dev_entry_from_acpi(iommu, devid   , e->flags, 0);
			set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
			amd_iommu_alias_table[devid] = devid_to;
			break;
		case IVHD_DEV_ALIAS_RANGE:

			DUMP_printk("  DEV_ALIAS_RANGE\t\t "
				    "devid: %02x:%02x.%x flags: %02x "
				    "devid_to: %02x:%02x.%x\n",
				    PCI_BUS_NUM(e->devid),
				    PCI_SLOT(e->devid),
				    PCI_FUNC(e->devid),
				    e->flags,
				    PCI_BUS_NUM(e->ext >> 8),
				    PCI_SLOT(e->ext >> 8),
				    PCI_FUNC(e->ext >> 8));

			devid_start = e->devid;
			flags = e->flags;
			devid_to = e->ext >> 8;
			ext_flags = 0;
			alias = true;
			break;
		case IVHD_DEV_EXT_SELECT:

			DUMP_printk("  DEV_EXT_SELECT\t\t devid: %02x:%02x.%x "
				    "flags: %02x ext: %08x\n",
				    PCI_BUS_NUM(e->devid),
				    PCI_SLOT(e->devid),
				    PCI_FUNC(e->devid),
				    e->flags, e->ext);

			devid = e->devid;
			set_dev_entry_from_acpi(iommu, devid, e->flags,
						e->ext);
			break;
		case IVHD_DEV_EXT_SELECT_RANGE:

			DUMP_printk("  DEV_EXT_SELECT_RANGE\t devid: "
				    "%02x:%02x.%x flags: %02x ext: %08x\n",
				    PCI_BUS_NUM(e->devid),
				    PCI_SLOT(e->devid),
				    PCI_FUNC(e->devid),
				    e->flags, e->ext);

			devid_start = e->devid;
			flags = e->flags;
			ext_flags = e->ext;
			alias = false;
			break;
		case IVHD_DEV_RANGE_END:

			DUMP_printk("  DEV_RANGE_END\t\t devid: %02x:%02x.%x\n",
				    PCI_BUS_NUM(e->devid),
				    PCI_SLOT(e->devid),
				    PCI_FUNC(e->devid));

			devid = e->devid;
			for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
				if (alias) {
					amd_iommu_alias_table[dev_i] = devid_to;
					set_dev_entry_from_acpi(iommu,
						devid_to, flags, ext_flags);
				}
				set_dev_entry_from_acpi(iommu, dev_i,
							flags, ext_flags);
			}
			break;
		case IVHD_DEV_SPECIAL: {
			u8 handle, type;
			const char *var;
			u16 devid;
			int ret;

			handle = e->ext & 0xff;
			devid  = (e->ext >>  8) & 0xffff;
			type   = (e->ext >> 24) & 0xff;

			if (type == IVHD_SPECIAL_IOAPIC)
				var = "IOAPIC";
			else if (type == IVHD_SPECIAL_HPET)
				var = "HPET";
			else
				var = "UNKNOWN";

			DUMP_printk("  DEV_SPECIAL(%s[%d])\t\tdevid: %02x:%02x.%x\n",
				    var, (int)handle,
				    PCI_BUS_NUM(devid),
				    PCI_SLOT(devid),
				    PCI_FUNC(devid));

			ret = add_special_device(type, handle, &devid, false);
			if (ret)
				return ret;

			/*
			 * add_special_device might update the devid in case a
			 * command-line override is present. So call
			 * set_dev_entry_from_acpi after add_special_device.
			 */
			set_dev_entry_from_acpi(iommu, devid, e->flags, 0);

			break;
		}
		case IVHD_DEV_ACPI_HID: {
			u16 devid;
			u8 hid[ACPIHID_HID_LEN];
			u8 uid[ACPIHID_UID_LEN];
			int ret;

			if (h->type != 0x40) {
				pr_err(FW_BUG "Invalid IVHD device type %#x\n",
				       e->type);
				break;
			}

			memcpy(hid, (u8 *)(&e->ext), ACPIHID_HID_LEN - 1);
			hid[ACPIHID_HID_LEN - 1] = '\0';

			if (!(*hid)) {
				pr_err(FW_BUG "Invalid HID.\n");
				break;
			}

			uid[0] = '\0';
			switch (e->uidf) {
			case UID_NOT_PRESENT:

				if (e->uidl != 0)
					pr_warn(FW_BUG "Invalid UID length.\n");

				break;
			case UID_IS_INTEGER:

				sprintf(uid, "%d", e->uid);

				break;
			case UID_IS_CHARACTER:

				memcpy(uid, &e->uid, e->uidl);
				uid[e->uidl] = '\0';

				break;
			default:
				break;
			}

			devid = e->devid;
			DUMP_printk("  DEV_ACPI_HID(%s[%s])\t\tdevid: %02x:%02x.%x\n",
				    hid, uid,
				    PCI_BUS_NUM(devid),
				    PCI_SLOT(devid),
				    PCI_FUNC(devid));

			flags = e->flags;

			ret = add_acpi_hid_device(hid, uid, &devid, false);
			if (ret)
				return ret;

			/*
			 * add_special_device might update the devid in case a
			 * command-line override is present. So call
			 * set_dev_entry_from_acpi after add_special_device.
			 */
			set_dev_entry_from_acpi(iommu, devid, e->flags, 0);

			break;
		}
		default:
			break;
		}

		p += ivhd_entry_length(p);
	}

	return 0;
}

static void __init free_iommu_one(struct amd_iommu *iommu)
{
	free_command_buffer(iommu);
	free_event_buffer(iommu);
	free_ppr_log(iommu);
	free_ga_log(iommu);
	iommu_unmap_mmio_space(iommu);
}

static void __init free_iommu_all(void)
{
	struct amd_iommu *iommu, *next;

	for_each_iommu_safe(iommu, next) {
		list_del(&iommu->list);
		free_iommu_one(iommu);
		kfree(iommu);
	}
}

/*
 * Family15h Model 10h-1fh erratum 746 (IOMMU Logging May Stall Translations)
 * Workaround:
 *     BIOS should disable L2B micellaneous clock gating by setting
 *     L2_L2B_CK_GATE_CONTROL[CKGateL2BMiscDisable](D0F2xF4_x90[2]) = 1b
 */
static void amd_iommu_erratum_746_workaround(struct amd_iommu *iommu)
{
	u32 value;

	if ((boot_cpu_data.x86 != 0x15) ||
	    (boot_cpu_data.x86_model < 0x10) ||
	    (boot_cpu_data.x86_model > 0x1f))
		return;

	pci_write_config_dword(iommu->dev, 0xf0, 0x90);
	pci_read_config_dword(iommu->dev, 0xf4, &value);

	if (value & BIT(2))
		return;

	/* Select NB indirect register 0x90 and enable writing */
	pci_write_config_dword(iommu->dev, 0xf0, 0x90 | (1 << 8));

	pci_write_config_dword(iommu->dev, 0xf4, value | 0x4);
	pci_info(iommu->dev, "Applying erratum 746 workaround\n");

	/* Clear the enable writing bit */
	pci_write_config_dword(iommu->dev, 0xf0, 0x90);
}

/*
 * Family15h Model 30h-3fh (IOMMU Mishandles ATS Write Permission)
 * Workaround:
 *     BIOS should enable ATS write permission check by setting
 *     L2_DEBUG_3[AtsIgnoreIWDis](D0F2xF4_x47[0]) = 1b
 */
static void amd_iommu_ats_write_check_workaround(struct amd_iommu *iommu)
{
	u32 value;

	if ((boot_cpu_data.x86 != 0x15) ||
	    (boot_cpu_data.x86_model < 0x30) ||
	    (boot_cpu_data.x86_model > 0x3f))
		return;

	/* Test L2_DEBUG_3[AtsIgnoreIWDis] == 1 */
	value = iommu_read_l2(iommu, 0x47);

	if (value & BIT(0))
		return;

	/* Set L2_DEBUG_3[AtsIgnoreIWDis] = 1 */
	iommu_write_l2(iommu, 0x47, value | BIT(0));

	pci_info(iommu->dev, "Applying ATS write check workaround\n");
}

/*
 * This function clues the initialization function for one IOMMU
 * together and also allocates the command buffer and programs the
 * hardware. It does NOT enable the IOMMU. This is done afterwards.
 */
static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
{
	int ret;

	raw_spin_lock_init(&iommu->lock);

	/* Add IOMMU to internal data structures */
	list_add_tail(&iommu->list, &amd_iommu_list);
	iommu->index = amd_iommus_present++;

	if (unlikely(iommu->index >= MAX_IOMMUS)) {
		WARN(1, "System has more IOMMUs than supported by this driver\n");
		return -ENOSYS;
	}

	/* Index is fine - add IOMMU to the array */
	amd_iommus[iommu->index] = iommu;

	/*
	 * Copy data from ACPI table entry to the iommu struct
	 */
	iommu->devid   = h->devid;
	iommu->cap_ptr = h->cap_ptr;
	iommu->pci_seg = h->pci_seg;
	iommu->mmio_phys = h->mmio_phys;

	switch (h->type) {
	case 0x10:
		/* Check if IVHD EFR contains proper max banks/counters */
		if ((h->efr_attr != 0) &&
		    ((h->efr_attr & (0xF << 13)) != 0) &&
		    ((h->efr_attr & (0x3F << 17)) != 0))
			iommu->mmio_phys_end = MMIO_REG_END_OFFSET;
		else
			iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET;
		if (((h->efr_attr & (0x1 << IOMMU_FEAT_GASUP_SHIFT)) == 0))
			amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
		break;
	case 0x11:
	case 0x40:
		if (h->efr_reg & (1 << 9))
			iommu->mmio_phys_end = MMIO_REG_END_OFFSET;
		else
			iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET;
		if (((h->efr_reg & (0x1 << IOMMU_EFR_GASUP_SHIFT)) == 0))
			amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
		/*
		 * Note: Since iommu_update_intcapxt() leverages
		 * the IOMMU MMIO access to MSI capability block registers
		 * for MSI address lo/hi/data, we need to check both
		 * EFR[XtSup] and EFR[MsiCapMmioSup] for x2APIC support.
		 */
		if ((h->efr_reg & BIT(IOMMU_EFR_XTSUP_SHIFT)) &&
		    (h->efr_reg & BIT(IOMMU_EFR_MSICAPMMIOSUP_SHIFT)))
			amd_iommu_xt_mode = IRQ_REMAP_X2APIC_MODE;
		break;
	default:
		return -EINVAL;
	}

	iommu->mmio_base = iommu_map_mmio_space(iommu->mmio_phys,
						iommu->mmio_phys_end);
	if (!iommu->mmio_base)
		return -ENOMEM;

	if (alloc_command_buffer(iommu))
		return -ENOMEM;

	if (alloc_event_buffer(iommu))
		return -ENOMEM;

	iommu->int_enabled = false;

	init_translation_status(iommu);
	if (translation_pre_enabled(iommu) && !is_kdump_kernel()) {
		iommu_disable(iommu);
		clear_translation_pre_enabled(iommu);
		pr_warn("Translation was enabled for IOMMU:%d but we are not in kdump mode\n",
			iommu->index);
	}
	if (amd_iommu_pre_enabled)
		amd_iommu_pre_enabled = translation_pre_enabled(iommu);

	ret = init_iommu_from_acpi(iommu, h);
	if (ret)
		return ret;

	ret = amd_iommu_create_irq_domain(iommu);
	if (ret)
		return ret;

	/*
	 * Make sure IOMMU is not considered to translate itself. The IVRS
	 * table tells us so, but this is a lie!
	 */
	amd_iommu_rlookup_table[iommu->devid] = NULL;

	return 0;
}

/**
 * get_highest_supported_ivhd_type - Look up the appropriate IVHD type
 * @ivrs          Pointer to the IVRS header
 *
 * This function search through all IVDB of the maximum supported IVHD
 */
static u8 get_highest_supported_ivhd_type(struct acpi_table_header *ivrs)
{
	u8 *base = (u8 *)ivrs;
	struct ivhd_header *ivhd = (struct ivhd_header *)
					(base + IVRS_HEADER_LENGTH);
	u8 last_type = ivhd->type;
	u16 devid = ivhd->devid;

	while (((u8 *)ivhd - base < ivrs->length) &&
	       (ivhd->type <= ACPI_IVHD_TYPE_MAX_SUPPORTED)) {
		u8 *p = (u8 *) ivhd;

		if (ivhd->devid == devid)
			last_type = ivhd->type;
		ivhd = (struct ivhd_header *)(p + ivhd->length);
	}

	return last_type;
}

/*
 * Iterates over all IOMMU entries in the ACPI table, allocates the
 * IOMMU structure and initializes it with init_iommu_one()
 */
static int __init init_iommu_all(struct acpi_table_header *table)
{
	u8 *p = (u8 *)table, *end = (u8 *)table;
	struct ivhd_header *h;
	struct amd_iommu *iommu;
	int ret;

	end += table->length;
	p += IVRS_HEADER_LENGTH;

	while (p < end) {
		h = (struct ivhd_header *)p;
		if (*p == amd_iommu_target_ivhd_type) {

			DUMP_printk("device: %02x:%02x.%01x cap: %04x "
				    "seg: %d flags: %01x info %04x\n",
				    PCI_BUS_NUM(h->devid), PCI_SLOT(h->devid),
				    PCI_FUNC(h->devid), h->cap_ptr,
				    h->pci_seg, h->flags, h->info);
			DUMP_printk("       mmio-addr: %016llx\n",
				    h->mmio_phys);

			iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
			if (iommu == NULL)
				return -ENOMEM;

			ret = init_iommu_one(iommu, h);
			if (ret)
				return ret;
		}
		p += h->length;

	}
	WARN_ON(p != end);

	return 0;
}

static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
				u8 fxn, u64 *value, bool is_write);

static void init_iommu_perf_ctr(struct amd_iommu *iommu)
{
	struct pci_dev *pdev = iommu->dev;
	u64 val = 0xabcd, val2 = 0, save_reg = 0;

	if (!iommu_feature(iommu, FEATURE_PC))
		return;

	amd_iommu_pc_present = true;

	/* save the value to restore, if writable */
	if (iommu_pc_get_set_reg(iommu, 0, 0, 0, &save_reg, false))
		goto pc_false;

	/* Check if the performance counters can be written to */
	if ((iommu_pc_get_set_reg(iommu, 0, 0, 0, &val, true)) ||
	    (iommu_pc_get_set_reg(iommu, 0, 0, 0, &val2, false)) ||
	    (val != val2))
		goto pc_false;

	/* restore */
	if (iommu_pc_get_set_reg(iommu, 0, 0, 0, &save_reg, true))
		goto pc_false;

	pci_info(pdev, "IOMMU performance counters supported\n");

	val = readl(iommu->mmio_base + MMIO_CNTR_CONF_OFFSET);
	iommu->max_banks = (u8) ((val >> 12) & 0x3f);
	iommu->max_counters = (u8) ((val >> 7) & 0xf);

	return;

pc_false:
	pci_err(pdev, "Unable to read/write to IOMMU perf counter.\n");
	amd_iommu_pc_present = false;
	return;
}

static ssize_t amd_iommu_show_cap(struct device *dev,
				  struct device_attribute *attr,
				  char *buf)
{
	struct amd_iommu *iommu = dev_to_amd_iommu(dev);
	return sprintf(buf, "%x\n", iommu->cap);
}
static DEVICE_ATTR(cap, S_IRUGO, amd_iommu_show_cap, NULL);

static ssize_t amd_iommu_show_features(struct device *dev,
				       struct device_attribute *attr,
				       char *buf)
{
	struct amd_iommu *iommu = dev_to_amd_iommu(dev);
	return sprintf(buf, "%llx\n", iommu->features);
}
static DEVICE_ATTR(features, S_IRUGO, amd_iommu_show_features, NULL);

static struct attribute *amd_iommu_attrs[] = {
	&dev_attr_cap.attr,
	&dev_attr_features.attr,
	NULL,
};

static struct attribute_group amd_iommu_group = {
	.name = "amd-iommu",
	.attrs = amd_iommu_attrs,
};

static const struct attribute_group *amd_iommu_groups[] = {
	&amd_iommu_group,
	NULL,
};

static int __init iommu_init_pci(struct amd_iommu *iommu)
{
	int cap_ptr = iommu->cap_ptr;
	int ret;

	iommu->dev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(iommu->devid),
						 iommu->devid & 0xff);
	if (!iommu->dev)
		return -ENODEV;

	/* Prevent binding other PCI device drivers to IOMMU devices */
	iommu->dev->match_driver = false;

	pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
			      &iommu->cap);

	if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
		amd_iommu_iotlb_sup = false;

	/* read extended feature bits */
	iommu->features = readq(iommu->mmio_base + MMIO_EXT_FEATURES);

	if (iommu_feature(iommu, FEATURE_GT)) {
		int glxval;
		u32 max_pasid;
		u64 pasmax;

		pasmax = iommu->features & FEATURE_PASID_MASK;
		pasmax >>= FEATURE_PASID_SHIFT;
		max_pasid  = (1 << (pasmax + 1)) - 1;

		amd_iommu_max_pasid = min(amd_iommu_max_pasid, max_pasid);

		BUG_ON(amd_iommu_max_pasid & ~PASID_MASK);

		glxval   = iommu->features & FEATURE_GLXVAL_MASK;
		glxval >>= FEATURE_GLXVAL_SHIFT;

		if (amd_iommu_max_glx_val == -1)
			amd_iommu_max_glx_val = glxval;
		else
			amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval);
	}

	if (iommu_feature(iommu, FEATURE_GT) &&
	    iommu_feature(iommu, FEATURE_PPR)) {
		iommu->is_iommu_v2   = true;
		amd_iommu_v2_present = true;
	}

	if (iommu_feature(iommu, FEATURE_PPR) && alloc_ppr_log(iommu))
		return -ENOMEM;

	ret = iommu_init_ga(iommu);
	if (ret)
		return ret;

	if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE))
		amd_iommu_np_cache = true;

	init_iommu_perf_ctr(iommu);

	if (is_rd890_iommu(iommu->dev)) {
		int i, j;

		iommu->root_pdev =
			pci_get_domain_bus_and_slot(0, iommu->dev->bus->number,
						    PCI_DEVFN(0, 0));

		/*
		 * Some rd890 systems may not be fully reconfigured by the
		 * BIOS, so it's necessary for us to store this information so
		 * it can be reprogrammed on resume
		 */
		pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4,
				&iommu->stored_addr_lo);
		pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8,
				&iommu->stored_addr_hi);

		/* Low bit locks writes to configuration space */
		iommu->stored_addr_lo &= ~1;

		for (i = 0; i < 6; i++)
			for (j = 0; j < 0x12; j++)
				iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j);

		for (i = 0; i < 0x83; i++)
			iommu->stored_l2[i] = iommu_read_l2(iommu, i);
	}

	amd_iommu_erratum_746_workaround(iommu);
	amd_iommu_ats_write_check_workaround(iommu);

	iommu_device_sysfs_add(&iommu->iommu, &iommu->dev->dev,
			       amd_iommu_groups, "ivhd%d", iommu->index);
	iommu_device_set_ops(&iommu->iommu, &amd_iommu_ops);
	iommu_device_register(&iommu->iommu);

	return pci_enable_device(iommu->dev);
}

static void print_iommu_info(void)
{
	static const char * const feat_str[] = {
		"PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
		"IA", "GA", "HE", "PC"
	};
	struct amd_iommu *iommu;

	for_each_iommu(iommu) {
		struct pci_dev *pdev = iommu->dev;
		int i;

		pci_info(pdev, "Found IOMMU cap 0x%hx\n", iommu->cap_ptr);

		if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
			pci_info(pdev, "Extended features (%#llx):",
				 iommu->features);
			for (i = 0; i < ARRAY_SIZE(feat_str); ++i) {
				if (iommu_feature(iommu, (1ULL << i)))
					pr_cont(" %s", feat_str[i]);
			}

			if (iommu->features & FEATURE_GAM_VAPIC)
				pr_cont(" GA_vAPIC");

			pr_cont("\n");
		}
	}
	if (irq_remapping_enabled) {
		pr_info("Interrupt remapping enabled\n");
		if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
			pr_info("Virtual APIC enabled\n");
		if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
			pr_info("X2APIC enabled\n");
	}
}

static int __init amd_iommu_init_pci(void)
{
	struct amd_iommu *iommu;
	int ret = 0;

	for_each_iommu(iommu) {
		ret = iommu_init_pci(iommu);
		if (ret)
			break;
	}

	/*
	 * Order is important here to make sure any unity map requirements are
	 * fulfilled. The unity mappings are created and written to the device
	 * table during the amd_iommu_init_api() call.
	 *
	 * After that we call init_device_table_dma() to make sure any
	 * uninitialized DTE will block DMA, and in the end we flush the caches
	 * of all IOMMUs to make sure the changes to the device table are
	 * active.
	 */
	ret = amd_iommu_init_api();

	init_device_table_dma();

	for_each_iommu(iommu)
		iommu_flush_all_caches(iommu);

	if (!ret)
		print_iommu_info();

	return ret;
}

/****************************************************************************
 *
 * The following functions initialize the MSI interrupts for all IOMMUs
 * in the system. It's a bit challenging because there could be multiple
 * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per
 * pci_dev.
 *
 ****************************************************************************/

static int iommu_setup_msi(struct amd_iommu *iommu)
{
	int r;

	r = pci_enable_msi(iommu->dev);
	if (r)
		return r;

	r = request_threaded_irq(iommu->dev->irq,
				 amd_iommu_int_handler,
				 amd_iommu_int_thread,
				 0, "AMD-Vi",
				 iommu);

	if (r) {
		pci_disable_msi(iommu->dev);
		return r;
	}

	iommu->int_enabled = true;

	return 0;
}

#define XT_INT_DEST_MODE(x)	(((x) & 0x1ULL) << 2)
#define XT_INT_DEST_LO(x)	(((x) & 0xFFFFFFULL) << 8)
#define XT_INT_VEC(x)		(((x) & 0xFFULL) << 32)
#define XT_INT_DEST_HI(x)	((((x) >> 24) & 0xFFULL) << 56)

/**
 * Setup the IntCapXT registers with interrupt routing information
 * based on the PCI MSI capability block registers, accessed via
 * MMIO MSI address low/hi and MSI data registers.
 */
static void iommu_update_intcapxt(struct amd_iommu *iommu)
{
	u64 val;
	u32 addr_lo = readl(iommu->mmio_base + MMIO_MSI_ADDR_LO_OFFSET);
	u32 addr_hi = readl(iommu->mmio_base + MMIO_MSI_ADDR_HI_OFFSET);
	u32 data    = readl(iommu->mmio_base + MMIO_MSI_DATA_OFFSET);
	bool dm     = (addr_lo >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
	u32 dest    = ((addr_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xFF);

	if (x2apic_enabled())
		dest |= MSI_ADDR_EXT_DEST_ID(addr_hi);

	val = XT_INT_VEC(data & 0xFF) |
	      XT_INT_DEST_MODE(dm) |
	      XT_INT_DEST_LO(dest) |
	      XT_INT_DEST_HI(dest);

	/**
	 * Current IOMMU implemtation uses the same IRQ for all
	 * 3 IOMMU interrupts.
	 */
	writeq(val, iommu->mmio_base + MMIO_INTCAPXT_EVT_OFFSET);
	writeq(val, iommu->mmio_base + MMIO_INTCAPXT_PPR_OFFSET);
	writeq(val, iommu->mmio_base + MMIO_INTCAPXT_GALOG_OFFSET);
}

static void _irq_notifier_notify(struct irq_affinity_notify *notify,
				 const cpumask_t *mask)
{
	struct amd_iommu *iommu;

	for_each_iommu(iommu) {
		if (iommu->dev->irq == notify->irq) {
			iommu_update_intcapxt(iommu);
			break;
		}
	}
}

static void _irq_notifier_release(struct kref *ref)
{
}

static int iommu_init_intcapxt(struct amd_iommu *iommu)
{
	int ret;
	struct irq_affinity_notify *notify = &iommu->intcapxt_notify;

	/**
	 * IntCapXT requires XTSup=1 and MsiCapMmioSup=1,
	 * which can be inferred from amd_iommu_xt_mode.
	 */
	if (amd_iommu_xt_mode != IRQ_REMAP_X2APIC_MODE)
		return 0;

	/**
	 * Also, we need to setup notifier to update the IntCapXT registers
	 * whenever the irq affinity is changed from user-space.
	 */
	notify->irq = iommu->dev->irq;
	notify->notify = _irq_notifier_notify,
	notify->release = _irq_notifier_release,
	ret = irq_set_affinity_notifier(iommu->dev->irq, notify);
	if (ret) {
		pr_err("Failed to register irq affinity notifier (devid=%#x, irq %d)\n",
		       iommu->devid, iommu->dev->irq);
		return ret;
	}

	iommu_update_intcapxt(iommu);
	iommu_feature_enable(iommu, CONTROL_INTCAPXT_EN);
	return ret;
}

static int iommu_init_msi(struct amd_iommu *iommu)
{
	int ret;

	if (iommu->int_enabled)
		goto enable_faults;

	if (iommu->dev->msi_cap)
		ret = iommu_setup_msi(iommu);
	else
		ret = -ENODEV;

	if (ret)
		return ret;

enable_faults:
	ret = iommu_init_intcapxt(iommu);
	if (ret)
		return ret;

	iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);

	if (iommu->ppr_log != NULL)
		iommu_feature_enable(iommu, CONTROL_PPRINT_EN);

	iommu_ga_log_enable(iommu);

	return 0;
}

/****************************************************************************
 *
 * The next functions belong to the third pass of parsing the ACPI
 * table. In this last pass the memory mapping requirements are
 * gathered (like exclusion and unity mapping ranges).
 *
 ****************************************************************************/

static void __init free_unity_maps(void)
{
	struct unity_map_entry *entry, *next;

	list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
		list_del(&entry->list);
		kfree(entry);
	}
}

/* called when we find an exclusion range definition in ACPI */
static int __init init_exclusion_range(struct ivmd_header *m)
{
	int i;

	switch (m->type) {
	case ACPI_IVMD_TYPE:
		set_device_exclusion_range(m->devid, m);
		break;
	case ACPI_IVMD_TYPE_ALL:
		for (i = 0; i <= amd_iommu_last_bdf; ++i)
			set_device_exclusion_range(i, m);
		break;
	case ACPI_IVMD_TYPE_RANGE:
		for (i = m->devid; i <= m->aux; ++i)
			set_device_exclusion_range(i, m);
		break;
	default:
		break;
	}

	return 0;
}

/* called for unity map ACPI definition */
static int __init init_unity_map_range(struct ivmd_header *m)
{
	struct unity_map_entry *e = NULL;
	char *s;

	e = kzalloc(sizeof(*e), GFP_KERNEL);
	if (e == NULL)
		return -ENOMEM;

	if (m->flags & IVMD_FLAG_EXCL_RANGE)
		init_exclusion_range(m);

	switch (m->type) {
	default:
		kfree(e);
		return 0;
	case ACPI_IVMD_TYPE:
		s = "IVMD_TYPEi\t\t\t";
		e->devid_start = e->devid_end = m->devid;
		break;
	case ACPI_IVMD_TYPE_ALL:
		s = "IVMD_TYPE_ALL\t\t";
		e->devid_start = 0;
		e->devid_end = amd_iommu_last_bdf;
		break;
	case ACPI_IVMD_TYPE_RANGE:
		s = "IVMD_TYPE_RANGE\t\t";
		e->devid_start = m->devid;
		e->devid_end = m->aux;
		break;
	}
	e->address_start = PAGE_ALIGN(m->range_start);
	e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
	e->prot = m->flags >> 1;

	DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"
		    " range_start: %016llx range_end: %016llx flags: %x\n", s,
		    PCI_BUS_NUM(e->devid_start), PCI_SLOT(e->devid_start),
		    PCI_FUNC(e->devid_start), PCI_BUS_NUM(e->devid_end),
		    PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
		    e->address_start, e->address_end, m->flags);

	list_add_tail(&e->list, &amd_iommu_unity_map);

	return 0;
}

/* iterates over all memory definitions we find in the ACPI table */
static int __init init_memory_definitions(struct acpi_table_header *table)
{
	u8 *p = (u8 *)table, *end = (u8 *)table;
	struct ivmd_header *m;

	end += table->length;
	p += IVRS_HEADER_LENGTH;

	while (p < end) {
		m = (struct ivmd_header *)p;
		if (m->flags & (IVMD_FLAG_UNITY_MAP | IVMD_FLAG_EXCL_RANGE))
			init_unity_map_range(m);

		p += m->length;
	}

	return 0;
}

/*
 * Init the device table to not allow DMA access for devices
 */
static void init_device_table_dma(void)
{
	u32 devid;

	for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
		set_dev_entry_bit(devid, DEV_ENTRY_VALID);
		set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
	}
}

static void __init uninit_device_table_dma(void)
{
	u32 devid;

	for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
		amd_iommu_dev_table[devid].data[0] = 0ULL;
		amd_iommu_dev_table[devid].data[1] = 0ULL;
	}
}

static void init_device_table(void)
{
	u32 devid;

	if (!amd_iommu_irq_remap)
		return;

	for (devid = 0; devid <= amd_iommu_last_bdf; ++devid)
		set_dev_entry_bit(devid, DEV_ENTRY_IRQ_TBL_EN);
}

static void iommu_init_flags(struct amd_iommu *iommu)
{
	iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ?
		iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
		iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);

	iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ?
		iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
		iommu_feature_disable(iommu, CONTROL_PASSPW_EN);

	iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
		iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
		iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);

	iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ?
		iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
		iommu_feature_disable(iommu, CONTROL_ISOC_EN);

	/*
	 * make IOMMU memory accesses cache coherent
	 */
	iommu_feature_enable(iommu, CONTROL_COHERENT_EN);

	/* Set IOTLB invalidation timeout to 1s */
	iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S);
}

static void iommu_apply_resume_quirks(struct amd_iommu *iommu)
{
	int i, j;
	u32 ioc_feature_control;
	struct pci_dev *pdev = iommu->root_pdev;

	/* RD890 BIOSes may not have completely reconfigured the iommu */
	if (!is_rd890_iommu(iommu->dev) || !pdev)
		return;

	/*
	 * First, we need to ensure that the iommu is enabled. This is
	 * controlled by a register in the northbridge
	 */

	/* Select Northbridge indirect register 0x75 and enable writing */
	pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7));
	pci_read_config_dword(pdev, 0x64, &ioc_feature_control);

	/* Enable the iommu */
	if (!(ioc_feature_control & 0x1))
		pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1);

	/* Restore the iommu BAR */
	pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
			       iommu->stored_addr_lo);
	pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8,
			       iommu->stored_addr_hi);

	/* Restore the l1 indirect regs for each of the 6 l1s */
	for (i = 0; i < 6; i++)
		for (j = 0; j < 0x12; j++)
			iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]);

	/* Restore the l2 indirect regs */
	for (i = 0; i < 0x83; i++)
		iommu_write_l2(iommu, i, iommu->stored_l2[i]);

	/* Lock PCI setup registers */
	pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
			       iommu->stored_addr_lo | 1);
}

static void iommu_enable_ga(struct amd_iommu *iommu)
{
#ifdef CONFIG_IRQ_REMAP
	switch (amd_iommu_guest_ir) {
	case AMD_IOMMU_GUEST_IR_VAPIC:
		iommu_feature_enable(iommu, CONTROL_GAM_EN);
		/* Fall through */
	case AMD_IOMMU_GUEST_IR_LEGACY_GA:
		iommu_feature_enable(iommu, CONTROL_GA_EN);
		iommu->irte_ops = &irte_128_ops;
		break;
	default:
		iommu->irte_ops = &irte_32_ops;
		break;
	}
#endif
}

static void early_enable_iommu(struct amd_iommu *iommu)
{
	iommu_disable(iommu);
	iommu_init_flags(iommu);
	iommu_set_device_table(iommu);
	iommu_enable_command_buffer(iommu);
	iommu_enable_event_buffer(iommu);
	iommu_set_exclusion_range(iommu);
	iommu_enable_ga(iommu);
	iommu_enable_xt(iommu);
	iommu_enable(iommu);
	iommu_flush_all_caches(iommu);
}

/*
 * This function finally enables all IOMMUs found in the system after
 * they have been initialized.
 *
 * Or if in kdump kernel and IOMMUs are all pre-enabled, try to copy
 * the old content of device table entries. Not this case or copy failed,
 * just continue as normal kernel does.
 */
static void early_enable_iommus(void)
{
	struct amd_iommu *iommu;


	if (!copy_device_table()) {
		/*
		 * If come here because of failure in copying device table from old
		 * kernel with all IOMMUs enabled, print error message and try to
		 * free allocated old_dev_tbl_cpy.
		 */
		if (amd_iommu_pre_enabled)
			pr_err("Failed to copy DEV table from previous kernel.\n");
		if (old_dev_tbl_cpy != NULL)
			free_pages((unsigned long)old_dev_tbl_cpy,
					get_order(dev_table_size));

		for_each_iommu(iommu) {
			clear_translation_pre_enabled(iommu);
			early_enable_iommu(iommu);
		}
	} else {
		pr_info("Copied DEV table from previous kernel.\n");
		free_pages((unsigned long)amd_iommu_dev_table,
				get_order(dev_table_size));
		amd_iommu_dev_table = old_dev_tbl_cpy;
		for_each_iommu(iommu) {
			iommu_disable_command_buffer(iommu);
			iommu_disable_event_buffer(iommu);
			iommu_enable_command_buffer(iommu);
			iommu_enable_event_buffer(iommu);
			iommu_enable_ga(iommu);
			iommu_enable_xt(iommu);
			iommu_set_device_table(iommu);
			iommu_flush_all_caches(iommu);
		}
	}

#ifdef CONFIG_IRQ_REMAP
	if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
		amd_iommu_irq_ops.capability |= (1 << IRQ_POSTING_CAP);
#endif
}

static void enable_iommus_v2(void)
{
	struct amd_iommu *iommu;

	for_each_iommu(iommu) {
		iommu_enable_ppr_log(iommu);
		iommu_enable_gt(iommu);
	}
}

static void enable_iommus(void)
{
	early_enable_iommus();

	enable_iommus_v2();
}

static void disable_iommus(void)
{
	struct amd_iommu *iommu;

	for_each_iommu(iommu)
		iommu_disable(iommu);

#ifdef CONFIG_IRQ_REMAP
	if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
		amd_iommu_irq_ops.capability &= ~(1 << IRQ_POSTING_CAP);
#endif
}

/*
 * Suspend/Resume support
 * disable suspend until real resume implemented
 */

static void amd_iommu_resume(void)
{
	struct amd_iommu *iommu;

	for_each_iommu(iommu)
		iommu_apply_resume_quirks(iommu);

	/* re-load the hardware */
	enable_iommus();

	amd_iommu_enable_interrupts();
}

static int amd_iommu_suspend(void)
{
	/* disable IOMMUs to go out of the way for BIOS */
	disable_iommus();

	return 0;
}

static struct syscore_ops amd_iommu_syscore_ops = {
	.suspend = amd_iommu_suspend,
	.resume = amd_iommu_resume,
};

static void __init free_iommu_resources(void)
{
	kmemleak_free(irq_lookup_table);
	free_pages((unsigned long)irq_lookup_table,
		   get_order(rlookup_table_size));
	irq_lookup_table = NULL;

	kmem_cache_destroy(amd_iommu_irq_cache);
	amd_iommu_irq_cache = NULL;

	free_pages((unsigned long)amd_iommu_rlookup_table,
		   get_order(rlookup_table_size));
	amd_iommu_rlookup_table = NULL;

	free_pages((unsigned long)amd_iommu_alias_table,
		   get_order(alias_table_size));
	amd_iommu_alias_table = NULL;

	free_pages((unsigned long)amd_iommu_dev_table,
		   get_order(dev_table_size));
	amd_iommu_dev_table = NULL;

	free_iommu_all();
}

/* SB IOAPIC is always on this device in AMD systems */
#define IOAPIC_SB_DEVID		((0x00 << 8) | PCI_DEVFN(0x14, 0))

static bool __init check_ioapic_information(void)
{
	const char *fw_bug = FW_BUG;
	bool ret, has_sb_ioapic;
	int idx;

	has_sb_ioapic = false;
	ret           = false;

	/*
	 * If we have map overrides on the kernel command line the
	 * messages in this function might not describe firmware bugs
	 * anymore - so be careful
	 */
	if (cmdline_maps)
		fw_bug = "";

	for (idx = 0; idx < nr_ioapics; idx++) {
		int devid, id = mpc_ioapic_id(idx);

		devid = get_ioapic_devid(id);
		if (devid < 0) {
			pr_err("%s: IOAPIC[%d] not in IVRS table\n",
				fw_bug, id);
			ret = false;
		} else if (devid == IOAPIC_SB_DEVID) {
			has_sb_ioapic = true;
			ret           = true;
		}
	}

	if (!has_sb_ioapic) {
		/*
		 * We expect the SB IOAPIC to be listed in the IVRS
		 * table. The system timer is connected to the SB IOAPIC
		 * and if we don't have it in the list the system will
		 * panic at boot time.  This situation usually happens
		 * when the BIOS is buggy and provides us the wrong
		 * device id for the IOAPIC in the system.
		 */
		pr_err("%s: No southbridge IOAPIC found\n", fw_bug);
	}

	if (!ret)
		pr_err("Disabling interrupt remapping\n");

	return ret;
}

static void __init free_dma_resources(void)
{
	free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
		   get_order(MAX_DOMAIN_ID/8));
	amd_iommu_pd_alloc_bitmap = NULL;

	free_unity_maps();
}

/*
 * This is the hardware init function for AMD IOMMU in the system.
 * This function is called either from amd_iommu_init or from the interrupt
 * remapping setup code.
 *
 * This function basically parses the ACPI table for AMD IOMMU (IVRS)
 * four times:
 *
 *	1 pass) Discover the most comprehensive IVHD type to use.
 *
 *	2 pass) Find the highest PCI device id the driver has to handle.
 *		Upon this information the size of the data structures is
 *		determined that needs to be allocated.
 *
 *	3 pass) Initialize the data structures just allocated with the
 *		information in the ACPI table about available AMD IOMMUs
 *		in the system. It also maps the PCI devices in the
 *		system to specific IOMMUs
 *
 *	4 pass) After the basic data structures are allocated and
 *		initialized we update them with information about memory
 *		remapping requirements parsed out of the ACPI table in
 *		this last pass.
 *
 * After everything is set up the IOMMUs are enabled and the necessary
 * hotplug and suspend notifiers are registered.
 */
static int __init early_amd_iommu_init(void)
{
	struct acpi_table_header *ivrs_base;
	acpi_status status;
	int i, remap_cache_sz, ret = 0;
	u32 pci_id;

	if (!amd_iommu_detected)
		return -ENODEV;

	status = acpi_get_table("IVRS", 0, &ivrs_base);
	if (status == AE_NOT_FOUND)
		return -ENODEV;
	else if (ACPI_FAILURE(status)) {
		const char *err = acpi_format_exception(status);
		pr_err("IVRS table error: %s\n", err);
		return -EINVAL;
	}

	/*
	 * Validate checksum here so we don't need to do it when
	 * we actually parse the table
	 */
	ret = check_ivrs_checksum(ivrs_base);
	if (ret)
		goto out;

	amd_iommu_target_ivhd_type = get_highest_supported_ivhd_type(ivrs_base);
	DUMP_printk("Using IVHD type %#x\n", amd_iommu_target_ivhd_type);

	/*
	 * First parse ACPI tables to find the largest Bus/Dev/Func
	 * we need to handle. Upon this information the shared data
	 * structures for the IOMMUs in the system will be allocated
	 */
	ret = find_last_devid_acpi(ivrs_base);
	if (ret)
		goto out;

	dev_table_size     = tbl_size(DEV_TABLE_ENTRY_SIZE);
	alias_table_size   = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
	rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);

	/* Device table - directly used by all IOMMUs */
	ret = -ENOMEM;
	amd_iommu_dev_table = (void *)__get_free_pages(
				      GFP_KERNEL | __GFP_ZERO | GFP_DMA32,
				      get_order(dev_table_size));
	if (amd_iommu_dev_table == NULL)
		goto out;

	/*
	 * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
	 * IOMMU see for that device
	 */
	amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
			get_order(alias_table_size));
	if (amd_iommu_alias_table == NULL)
		goto out;

	/* IOMMU rlookup table - find the IOMMU for a specific device */
	amd_iommu_rlookup_table = (void *)__get_free_pages(
			GFP_KERNEL | __GFP_ZERO,
			get_order(rlookup_table_size));
	if (amd_iommu_rlookup_table == NULL)
		goto out;

	amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
					    GFP_KERNEL | __GFP_ZERO,
					    get_order(MAX_DOMAIN_ID/8));
	if (amd_iommu_pd_alloc_bitmap == NULL)
		goto out;

	/*
	 * let all alias entries point to itself
	 */
	for (i = 0; i <= amd_iommu_last_bdf; ++i)
		amd_iommu_alias_table[i] = i;

	/*
	 * never allocate domain 0 because its used as the non-allocated and
	 * error value placeholder
	 */
	__set_bit(0, amd_iommu_pd_alloc_bitmap);

	/*
	 * now the data structures are allocated and basically initialized
	 * start the real acpi table scan
	 */
	ret = init_iommu_all(ivrs_base);
	if (ret)
		goto out;

	/* Disable IOMMU if there's Stoney Ridge graphics */
	for (i = 0; i < 32; i++) {
		pci_id = read_pci_config(0, i, 0, 0);
		if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
			pr_info("Disable IOMMU on Stoney Ridge\n");
			amd_iommu_disabled = true;
			break;
		}
	}

	/* Disable any previously enabled IOMMUs */
	if (!is_kdump_kernel() || amd_iommu_disabled)
		disable_iommus();

	if (amd_iommu_irq_remap)
		amd_iommu_irq_remap = check_ioapic_information();

	if (amd_iommu_irq_remap) {
		/*
		 * Interrupt remapping enabled, create kmem_cache for the
		 * remapping tables.
		 */
		ret = -ENOMEM;
		if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
			remap_cache_sz = MAX_IRQS_PER_TABLE * sizeof(u32);
		else
			remap_cache_sz = MAX_IRQS_PER_TABLE * (sizeof(u64) * 2);
		amd_iommu_irq_cache = kmem_cache_create("irq_remap_cache",
							remap_cache_sz,
							IRQ_TABLE_ALIGNMENT,
							0, NULL);
		if (!amd_iommu_irq_cache)
			goto out;

		irq_lookup_table = (void *)__get_free_pages(
				GFP_KERNEL | __GFP_ZERO,
				get_order(rlookup_table_size));
		kmemleak_alloc(irq_lookup_table, rlookup_table_size,
			       1, GFP_KERNEL);
		if (!irq_lookup_table)
			goto out;
	}

	ret = init_memory_definitions(ivrs_base);
	if (ret)
		goto out;

	/* init the device table */
	init_device_table();

out:
	/* Don't leak any ACPI memory */
	acpi_put_table(ivrs_base);
	ivrs_base = NULL;

	return ret;
}

static int amd_iommu_enable_interrupts(void)
{
	struct amd_iommu *iommu;
	int ret = 0;

	for_each_iommu(iommu) {
		ret = iommu_init_msi(iommu);
		if (ret)
			goto out;
	}

out:
	return ret;
}

static bool detect_ivrs(void)
{
	struct acpi_table_header *ivrs_base;
	acpi_status status;

	status = acpi_get_table("IVRS", 0, &ivrs_base);
	if (status == AE_NOT_FOUND)
		return false;
	else if (ACPI_FAILURE(status)) {
		const char *err = acpi_format_exception(status);
		pr_err("IVRS table error: %s\n", err);
		return false;
	}

	acpi_put_table(ivrs_base);

	/* Make sure ACS will be enabled during PCI probe */
	pci_request_acs();

	return true;
}

/****************************************************************************
 *
 * AMD IOMMU Initialization State Machine
 *
 ****************************************************************************/

static int __init state_next(void)
{
	int ret = 0;

	switch (init_state) {
	case IOMMU_START_STATE:
		if (!detect_ivrs()) {
			init_state	= IOMMU_NOT_FOUND;
			ret		= -ENODEV;
		} else {
			init_state	= IOMMU_IVRS_DETECTED;
		}
		break;
	case IOMMU_IVRS_DETECTED:
		ret = early_amd_iommu_init();
		init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED;
		if (init_state == IOMMU_ACPI_FINISHED && amd_iommu_disabled) {
			pr_info("AMD IOMMU disabled\n");
			init_state = IOMMU_CMDLINE_DISABLED;
			ret = -EINVAL;
		}
		break;
	case IOMMU_ACPI_FINISHED:
		early_enable_iommus();
		x86_platform.iommu_shutdown = disable_iommus;
		init_state = IOMMU_ENABLED;
		break;
	case IOMMU_ENABLED:
		register_syscore_ops(&amd_iommu_syscore_ops);
		ret = amd_iommu_init_pci();
		init_state = ret ? IOMMU_INIT_ERROR : IOMMU_PCI_INIT;
		enable_iommus_v2();
		break;
	case IOMMU_PCI_INIT:
		ret = amd_iommu_enable_interrupts();
		init_state = ret ? IOMMU_INIT_ERROR : IOMMU_INTERRUPTS_EN;
		break;
	case IOMMU_INTERRUPTS_EN:
		ret = amd_iommu_init_dma_ops();
		init_state = ret ? IOMMU_INIT_ERROR : IOMMU_DMA_OPS;
		break;
	case IOMMU_DMA_OPS:
		init_state = IOMMU_INITIALIZED;
		break;
	case IOMMU_INITIALIZED:
		/* Nothing to do */
		break;
	case IOMMU_NOT_FOUND:
	case IOMMU_INIT_ERROR:
	case IOMMU_CMDLINE_DISABLED:
		/* Error states => do nothing */
		ret = -EINVAL;
		break;
	default:
		/* Unknown state */
		BUG();
	}

	if (ret) {
		free_dma_resources();
		if (!irq_remapping_enabled) {
			disable_iommus();
			free_iommu_resources();
		} else {
			struct amd_iommu *iommu;

			uninit_device_table_dma();
			for_each_iommu(iommu)
				iommu_flush_all_caches(iommu);
		}
	}
	return ret;
}

static int __init iommu_go_to_state(enum iommu_init_state state)
{
	int ret = -EINVAL;

	while (init_state != state) {
		if (init_state == IOMMU_NOT_FOUND         ||
		    init_state == IOMMU_INIT_ERROR        ||
		    init_state == IOMMU_CMDLINE_DISABLED)
			break;
		ret = state_next();
	}

	return ret;
}

#ifdef CONFIG_IRQ_REMAP
int __init amd_iommu_prepare(void)
{
	int ret;

	amd_iommu_irq_remap = true;

	ret = iommu_go_to_state(IOMMU_ACPI_FINISHED);
	if (ret)
		return ret;
	return amd_iommu_irq_remap ? 0 : -ENODEV;
}

int __init amd_iommu_enable(void)
{
	int ret;

	ret = iommu_go_to_state(IOMMU_ENABLED);
	if (ret)
		return ret;

	irq_remapping_enabled = 1;
	return amd_iommu_xt_mode;
}

void amd_iommu_disable(void)
{
	amd_iommu_suspend();
}

int amd_iommu_reenable(int mode)
{
	amd_iommu_resume();

	return 0;
}

int __init amd_iommu_enable_faulting(void)
{
	/* We enable MSI later when PCI is initialized */
	return 0;
}
#endif

/*
 * This is the core init function for AMD IOMMU hardware in the system.
 * This function is called from the generic x86 DMA layer initialization
 * code.
 */
static int __init amd_iommu_init(void)
{
	struct amd_iommu *iommu;
	int ret;

	ret = iommu_go_to_state(IOMMU_INITIALIZED);
#ifdef CONFIG_GART_IOMMU
	if (ret && list_empty(&amd_iommu_list)) {
		/*
		 * We failed to initialize the AMD IOMMU - try fallback
		 * to GART if possible.
		 */
		gart_iommu_init();
	}
#endif

	for_each_iommu(iommu)
		amd_iommu_debugfs_setup(iommu);

	return ret;
}

static bool amd_iommu_sme_check(void)
{
	if (!sme_active() || (boot_cpu_data.x86 != 0x17))
		return true;

	/* For Fam17h, a specific level of support is required */
	if (boot_cpu_data.microcode >= 0x08001205)
		return true;

	if ((boot_cpu_data.microcode >= 0x08001126) &&
	    (boot_cpu_data.microcode <= 0x080011ff))
		return true;

	pr_notice("IOMMU not currently supported when SME is active\n");

	return false;
}

/****************************************************************************
 *
 * Early detect code. This code runs at IOMMU detection time in the DMA
 * layer. It just looks if there is an IVRS ACPI table to detect AMD
 * IOMMUs
 *
 ****************************************************************************/
int __init amd_iommu_detect(void)
{
	int ret;

	if (no_iommu || (iommu_detected && !gart_iommu_aperture))
		return -ENODEV;

	if (!amd_iommu_sme_check())
		return -ENODEV;

	ret = iommu_go_to_state(IOMMU_IVRS_DETECTED);
	if (ret)
		return ret;

	amd_iommu_detected = true;
	iommu_detected = 1;
	x86_init.iommu.iommu_init = amd_iommu_init;

	return 1;
}

/****************************************************************************
 *
 * Parsing functions for the AMD IOMMU specific kernel command line
 * options.
 *
 ****************************************************************************/

static int __init parse_amd_iommu_dump(char *str)
{
	amd_iommu_dump = true;

	return 1;
}

static int __init parse_amd_iommu_intr(char *str)
{
	for (; *str; ++str) {
		if (strncmp(str, "legacy", 6) == 0) {
			amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
			break;
		}
		if (strncmp(str, "vapic", 5) == 0) {
			amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC;
			break;
		}
	}
	return 1;
}

static int __init parse_amd_iommu_options(char *str)
{
	for (; *str; ++str) {
		if (strncmp(str, "fullflush", 9) == 0)
			amd_iommu_unmap_flush = true;
		if (strncmp(str, "off", 3) == 0)
			amd_iommu_disabled = true;
		if (strncmp(str, "force_isolation", 15) == 0)
			amd_iommu_force_isolation = true;
	}

	return 1;
}

static int __init parse_ivrs_ioapic(char *str)
{
	unsigned int bus, dev, fn;
	int ret, id, i;
	u16 devid;

	ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);

	if (ret != 4) {
		pr_err("Invalid command line: ivrs_ioapic%s\n", str);
		return 1;
	}

	if (early_ioapic_map_size == EARLY_MAP_SIZE) {
		pr_err("Early IOAPIC map overflow - ignoring ivrs_ioapic%s\n",
			str);
		return 1;
	}

	devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);

	cmdline_maps			= true;
	i				= early_ioapic_map_size++;
	early_ioapic_map[i].id		= id;
	early_ioapic_map[i].devid	= devid;
	early_ioapic_map[i].cmd_line	= true;

	return 1;
}

static int __init parse_ivrs_hpet(char *str)
{
	unsigned int bus, dev, fn;
	int ret, id, i;
	u16 devid;

	ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);

	if (ret != 4) {
		pr_err("Invalid command line: ivrs_hpet%s\n", str);
		return 1;
	}

	if (early_hpet_map_size == EARLY_MAP_SIZE) {
		pr_err("Early HPET map overflow - ignoring ivrs_hpet%s\n",
			str);
		return 1;
	}

	devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);

	cmdline_maps			= true;
	i				= early_hpet_map_size++;
	early_hpet_map[i].id		= id;
	early_hpet_map[i].devid		= devid;
	early_hpet_map[i].cmd_line	= true;

	return 1;
}

static int __init parse_ivrs_acpihid(char *str)
{
	u32 bus, dev, fn;
	char *hid, *uid, *p;
	char acpiid[ACPIHID_UID_LEN + ACPIHID_HID_LEN] = {0};
	int ret, i;

	ret = sscanf(str, "[%x:%x.%x]=%s", &bus, &dev, &fn, acpiid);
	if (ret != 4) {
		pr_err("Invalid command line: ivrs_acpihid(%s)\n", str);
		return 1;
	}

	p = acpiid;
	hid = strsep(&p, ":");
	uid = p;

	if (!hid || !(*hid) || !uid) {
		pr_err("Invalid command line: hid or uid\n");
		return 1;
	}

	i = early_acpihid_map_size++;
	memcpy(early_acpihid_map[i].hid, hid, strlen(hid));
	memcpy(early_acpihid_map[i].uid, uid, strlen(uid));
	early_acpihid_map[i].devid =
		((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
	early_acpihid_map[i].cmd_line	= true;

	return 1;
}

__setup("amd_iommu_dump",	parse_amd_iommu_dump);
__setup("amd_iommu=",		parse_amd_iommu_options);
__setup("amd_iommu_intr=",	parse_amd_iommu_intr);
__setup("ivrs_ioapic",		parse_ivrs_ioapic);
__setup("ivrs_hpet",		parse_ivrs_hpet);
__setup("ivrs_acpihid",		parse_ivrs_acpihid);

IOMMU_INIT_FINISH(amd_iommu_detect,
		  gart_iommu_hole_init,
		  NULL,
		  NULL);

bool amd_iommu_v2_supported(void)
{
	return amd_iommu_v2_present;
}
EXPORT_SYMBOL(amd_iommu_v2_supported);

struct amd_iommu *get_amd_iommu(unsigned int idx)
{
	unsigned int i = 0;
	struct amd_iommu *iommu;

	for_each_iommu(iommu)
		if (i++ == idx)
			return iommu;
	return NULL;
}
EXPORT_SYMBOL(get_amd_iommu);

/****************************************************************************
 *
 * IOMMU EFR Performance Counter support functionality. This code allows
 * access to the IOMMU PC functionality.
 *
 ****************************************************************************/

u8 amd_iommu_pc_get_max_banks(unsigned int idx)
{
	struct amd_iommu *iommu = get_amd_iommu(idx);

	if (iommu)
		return iommu->max_banks;

	return 0;
}
EXPORT_SYMBOL(amd_iommu_pc_get_max_banks);

bool amd_iommu_pc_supported(void)
{
	return amd_iommu_pc_present;
}
EXPORT_SYMBOL(amd_iommu_pc_supported);

u8 amd_iommu_pc_get_max_counters(unsigned int idx)
{
	struct amd_iommu *iommu = get_amd_iommu(idx);

	if (iommu)
		return iommu->max_counters;

	return 0;
}
EXPORT_SYMBOL(amd_iommu_pc_get_max_counters);

static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
				u8 fxn, u64 *value, bool is_write)
{
	u32 offset;
	u32 max_offset_lim;

	/* Make sure the IOMMU PC resource is available */
	if (!amd_iommu_pc_present)
		return -ENODEV;

	/* Check for valid iommu and pc register indexing */
	if (WARN_ON(!iommu || (fxn > 0x28) || (fxn & 7)))
		return -ENODEV;

	offset = (u32)(((0x40 | bank) << 12) | (cntr << 8) | fxn);

	/* Limit the offset to the hw defined mmio region aperture */
	max_offset_lim = (u32)(((0x40 | iommu->max_banks) << 12) |
				(iommu->max_counters << 8) | 0x28);
	if ((offset < MMIO_CNTR_REG_OFFSET) ||
	    (offset > max_offset_lim))
		return -EINVAL;

	if (is_write) {
		u64 val = *value & GENMASK_ULL(47, 0);

		writel((u32)val, iommu->mmio_base + offset);
		writel((val >> 32), iommu->mmio_base + offset + 4);
	} else {
		*value = readl(iommu->mmio_base + offset + 4);
		*value <<= 32;
		*value |= readl(iommu->mmio_base + offset);
		*value &= GENMASK_ULL(47, 0);
	}

	return 0;
}

int amd_iommu_pc_get_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
{
	if (!iommu)
		return -EINVAL;

	return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, false);
}
EXPORT_SYMBOL(amd_iommu_pc_get_reg);

int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
{
	if (!iommu)
		return -EINVAL;

	return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, true);
}
EXPORT_SYMBOL(amd_iommu_pc_set_reg);