summaryrefslogtreecommitdiff
path: root/drivers/iommu/amd/iommu.c
blob: 94ebffe1596038efd615e6edab791a92c23858ad (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
// 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/ratelimit.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/amba/bus.h>
#include <linux/platform_device.h>
#include <linux/pci-ats.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/scatterlist.h>
#include <linux/dma-map-ops.h>
#include <linux/dma-direct.h>
#include <linux/dma-iommu.h>
#include <linux/iommu-helper.h>
#include <linux/delay.h>
#include <linux/amd-iommu.h>
#include <linux/notifier.h>
#include <linux/export.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/irqdomain.h>
#include <linux/percpu.h>
#include <linux/io-pgtable.h>
#include <linux/cc_platform.h>
#include <asm/irq_remapping.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
#include <asm/hw_irq.h>
#include <asm/proto.h>
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/dma.h>

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

#define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))

#define LOOP_TIMEOUT	100000

/* IO virtual address start page frame number */
#define IOVA_START_PFN		(1)
#define IOVA_PFN(addr)		((addr) >> PAGE_SHIFT)

/* Reserved IOVA ranges */
#define MSI_RANGE_START		(0xfee00000)
#define MSI_RANGE_END		(0xfeefffff)
#define HT_RANGE_START		(0xfd00000000ULL)
#define HT_RANGE_END		(0xffffffffffULL)

#define DEFAULT_PGTABLE_LEVEL	PAGE_MODE_3_LEVEL

static DEFINE_SPINLOCK(pd_bitmap_lock);

LIST_HEAD(ioapic_map);
LIST_HEAD(hpet_map);
LIST_HEAD(acpihid_map);

/*
 * Domain for untranslated devices - only allocated
 * if iommu=pt passed on kernel cmd line.
 */
const struct iommu_ops amd_iommu_ops;

static ATOMIC_NOTIFIER_HEAD(ppr_notifier);
int amd_iommu_max_glx_val = -1;

/*
 * general struct to manage commands send to an IOMMU
 */
struct iommu_cmd {
	u32 data[4];
};

struct kmem_cache *amd_iommu_irq_cache;

static void detach_device(struct device *dev);

/****************************************************************************
 *
 * Helper functions
 *
 ****************************************************************************/

static inline u16 get_pci_device_id(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	return pci_dev_id(pdev);
}

static inline int get_acpihid_device_id(struct device *dev,
					struct acpihid_map_entry **entry)
{
	struct acpi_device *adev = ACPI_COMPANION(dev);
	struct acpihid_map_entry *p;

	if (!adev)
		return -ENODEV;

	list_for_each_entry(p, &acpihid_map, list) {
		if (acpi_dev_hid_uid_match(adev, p->hid,
					   p->uid[0] ? p->uid : NULL)) {
			if (entry)
				*entry = p;
			return p->devid;
		}
	}
	return -EINVAL;
}

static inline int get_device_id(struct device *dev)
{
	int devid;

	if (dev_is_pci(dev))
		devid = get_pci_device_id(dev);
	else
		devid = get_acpihid_device_id(dev, NULL);

	return devid;
}

struct dev_table_entry *get_dev_table(struct amd_iommu *iommu)
{
	struct dev_table_entry *dev_table;
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;

	BUG_ON(pci_seg == NULL);
	dev_table = pci_seg->dev_table;
	BUG_ON(dev_table == NULL);

	return dev_table;
}

static inline u16 get_device_segment(struct device *dev)
{
	u16 seg;

	if (dev_is_pci(dev)) {
		struct pci_dev *pdev = to_pci_dev(dev);

		seg = pci_domain_nr(pdev->bus);
	} else {
		u32 devid = get_acpihid_device_id(dev, NULL);

		seg = PCI_SBDF_TO_SEGID(devid);
	}

	return seg;
}

/* Writes the specific IOMMU for a device into the PCI segment rlookup table */
void amd_iommu_set_rlookup_table(struct amd_iommu *iommu, u16 devid)
{
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;

	pci_seg->rlookup_table[devid] = iommu;
}

static struct amd_iommu *__rlookup_amd_iommu(u16 seg, u16 devid)
{
	struct amd_iommu_pci_seg *pci_seg;

	for_each_pci_segment(pci_seg) {
		if (pci_seg->id == seg)
			return pci_seg->rlookup_table[devid];
	}
	return NULL;
}

static struct amd_iommu *rlookup_amd_iommu(struct device *dev)
{
	u16 seg = get_device_segment(dev);
	u16 devid = get_device_id(dev);

	return __rlookup_amd_iommu(seg, devid);
}

static struct protection_domain *to_pdomain(struct iommu_domain *dom)
{
	return container_of(dom, struct protection_domain, domain);
}

static struct iommu_dev_data *alloc_dev_data(struct amd_iommu *iommu, u16 devid)
{
	struct iommu_dev_data *dev_data;
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;

	dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
	if (!dev_data)
		return NULL;

	spin_lock_init(&dev_data->lock);
	dev_data->devid = devid;
	ratelimit_default_init(&dev_data->rs);

	llist_add(&dev_data->dev_data_list, &pci_seg->dev_data_list);
	return dev_data;
}

static struct iommu_dev_data *search_dev_data(struct amd_iommu *iommu, u16 devid)
{
	struct iommu_dev_data *dev_data;
	struct llist_node *node;
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;

	if (llist_empty(&pci_seg->dev_data_list))
		return NULL;

	node = pci_seg->dev_data_list.first;
	llist_for_each_entry(dev_data, node, dev_data_list) {
		if (dev_data->devid == devid)
			return dev_data;
	}

	return NULL;
}

static int clone_alias(struct pci_dev *pdev, u16 alias, void *data)
{
	struct amd_iommu *iommu;
	struct dev_table_entry *dev_table;
	u16 devid = pci_dev_id(pdev);

	if (devid == alias)
		return 0;

	iommu = rlookup_amd_iommu(&pdev->dev);
	if (!iommu)
		return 0;

	amd_iommu_set_rlookup_table(iommu, alias);
	dev_table = get_dev_table(iommu);
	memcpy(dev_table[alias].data,
	       dev_table[devid].data,
	       sizeof(dev_table[alias].data));

	return 0;
}

static void clone_aliases(struct amd_iommu *iommu, struct device *dev)
{
	struct pci_dev *pdev;

	if (!dev_is_pci(dev))
		return;
	pdev = to_pci_dev(dev);

	/*
	 * The IVRS alias stored in the alias table may not be
	 * part of the PCI DMA aliases if it's bus differs
	 * from the original device.
	 */
	clone_alias(pdev, iommu->pci_seg->alias_table[pci_dev_id(pdev)], NULL);

	pci_for_each_dma_alias(pdev, clone_alias, NULL);
}

static void setup_aliases(struct amd_iommu *iommu, struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
	u16 ivrs_alias;

	/* For ACPI HID devices, there are no aliases */
	if (!dev_is_pci(dev))
		return;

	/*
	 * Add the IVRS alias to the pci aliases if it is on the same
	 * bus. The IVRS table may know about a quirk that we don't.
	 */
	ivrs_alias = pci_seg->alias_table[pci_dev_id(pdev)];
	if (ivrs_alias != pci_dev_id(pdev) &&
	    PCI_BUS_NUM(ivrs_alias) == pdev->bus->number)
		pci_add_dma_alias(pdev, ivrs_alias & 0xff, 1);

	clone_aliases(iommu, dev);
}

static struct iommu_dev_data *find_dev_data(struct amd_iommu *iommu, u16 devid)
{
	struct iommu_dev_data *dev_data;

	dev_data = search_dev_data(iommu, devid);

	if (dev_data == NULL) {
		dev_data = alloc_dev_data(iommu, devid);
		if (!dev_data)
			return NULL;

		if (translation_pre_enabled(iommu))
			dev_data->defer_attach = true;
	}

	return dev_data;
}

/*
* Find or create an IOMMU group for a acpihid device.
*/
static struct iommu_group *acpihid_device_group(struct device *dev)
{
	struct acpihid_map_entry *p, *entry = NULL;
	int devid;

	devid = get_acpihid_device_id(dev, &entry);
	if (devid < 0)
		return ERR_PTR(devid);

	list_for_each_entry(p, &acpihid_map, list) {
		if ((devid == p->devid) && p->group)
			entry->group = p->group;
	}

	if (!entry->group)
		entry->group = generic_device_group(dev);
	else
		iommu_group_ref_get(entry->group);

	return entry->group;
}

static bool pci_iommuv2_capable(struct pci_dev *pdev)
{
	static const int caps[] = {
		PCI_EXT_CAP_ID_PRI,
		PCI_EXT_CAP_ID_PASID,
	};
	int i, pos;

	if (!pci_ats_supported(pdev))
		return false;

	for (i = 0; i < 2; ++i) {
		pos = pci_find_ext_capability(pdev, caps[i]);
		if (pos == 0)
			return false;
	}

	return true;
}

/*
 * This function checks if the driver got a valid device from the caller to
 * avoid dereferencing invalid pointers.
 */
static bool check_device(struct device *dev)
{
	struct amd_iommu_pci_seg *pci_seg;
	struct amd_iommu *iommu;
	int devid;

	if (!dev)
		return false;

	devid = get_device_id(dev);
	if (devid < 0)
		return false;

	iommu = rlookup_amd_iommu(dev);
	if (!iommu)
		return false;

	/* Out of our scope? */
	pci_seg = iommu->pci_seg;
	if ((devid & 0xffff) > pci_seg->last_bdf)
		return false;

	return true;
}

static int iommu_init_device(struct amd_iommu *iommu, struct device *dev)
{
	struct iommu_dev_data *dev_data;
	int devid;

	if (dev_iommu_priv_get(dev))
		return 0;

	devid = get_device_id(dev);
	if (devid < 0)
		return devid;

	dev_data = find_dev_data(iommu, devid);
	if (!dev_data)
		return -ENOMEM;

	dev_data->dev = dev;
	setup_aliases(iommu, dev);

	/*
	 * By default we use passthrough mode for IOMMUv2 capable device.
	 * But if amd_iommu=force_isolation is set (e.g. to debug DMA to
	 * invalid address), we ignore the capability for the device so
	 * it'll be forced to go into translation mode.
	 */
	if ((iommu_default_passthrough() || !amd_iommu_force_isolation) &&
	    dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) {
		dev_data->iommu_v2 = iommu->is_iommu_v2;
	}

	dev_iommu_priv_set(dev, dev_data);

	return 0;
}

static void iommu_ignore_device(struct amd_iommu *iommu, struct device *dev)
{
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
	struct dev_table_entry *dev_table = get_dev_table(iommu);
	int devid;

	devid = (get_device_id(dev)) & 0xffff;
	if (devid < 0)
		return;

	pci_seg->rlookup_table[devid] = NULL;
	memset(&dev_table[devid], 0, sizeof(struct dev_table_entry));

	setup_aliases(iommu, dev);
}

static void amd_iommu_uninit_device(struct device *dev)
{
	struct iommu_dev_data *dev_data;

	dev_data = dev_iommu_priv_get(dev);
	if (!dev_data)
		return;

	if (dev_data->domain)
		detach_device(dev);

	dev_iommu_priv_set(dev, NULL);

	/*
	 * We keep dev_data around for unplugged devices and reuse it when the
	 * device is re-plugged - not doing so would introduce a ton of races.
	 */
}

/****************************************************************************
 *
 * Interrupt handling functions
 *
 ****************************************************************************/

static void dump_dte_entry(struct amd_iommu *iommu, u16 devid)
{
	int i;
	struct dev_table_entry *dev_table = get_dev_table(iommu);

	for (i = 0; i < 4; ++i)
		pr_err("DTE[%d]: %016llx\n", i, dev_table[devid].data[i]);
}

static void dump_command(unsigned long phys_addr)
{
	struct iommu_cmd *cmd = iommu_phys_to_virt(phys_addr);
	int i;

	for (i = 0; i < 4; ++i)
		pr_err("CMD[%d]: %08x\n", i, cmd->data[i]);
}

static void amd_iommu_report_rmp_hw_error(volatile u32 *event)
{
	struct iommu_dev_data *dev_data = NULL;
	int devid, vmg_tag, flags;
	struct pci_dev *pdev;
	u64 spa;

	devid   = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
	vmg_tag = (event[1]) & 0xFFFF;
	flags   = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
	spa     = ((u64)event[3] << 32) | (event[2] & 0xFFFFFFF8);

	pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid),
					   devid & 0xff);
	if (pdev)
		dev_data = dev_iommu_priv_get(&pdev->dev);

	if (dev_data) {
		if (__ratelimit(&dev_data->rs)) {
			pci_err(pdev, "Event logged [RMP_HW_ERROR vmg_tag=0x%04x, spa=0x%llx, flags=0x%04x]\n",
				vmg_tag, spa, flags);
		}
	} else {
		pr_err_ratelimited("Event logged [RMP_HW_ERROR device=%02x:%02x.%x, vmg_tag=0x%04x, spa=0x%llx, flags=0x%04x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			vmg_tag, spa, flags);
	}

	if (pdev)
		pci_dev_put(pdev);
}

static void amd_iommu_report_rmp_fault(volatile u32 *event)
{
	struct iommu_dev_data *dev_data = NULL;
	int devid, flags_rmp, vmg_tag, flags;
	struct pci_dev *pdev;
	u64 gpa;

	devid     = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
	flags_rmp = (event[0] >> EVENT_FLAGS_SHIFT) & 0xFF;
	vmg_tag   = (event[1]) & 0xFFFF;
	flags     = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
	gpa       = ((u64)event[3] << 32) | event[2];

	pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid),
					   devid & 0xff);
	if (pdev)
		dev_data = dev_iommu_priv_get(&pdev->dev);

	if (dev_data) {
		if (__ratelimit(&dev_data->rs)) {
			pci_err(pdev, "Event logged [RMP_PAGE_FAULT vmg_tag=0x%04x, gpa=0x%llx, flags_rmp=0x%04x, flags=0x%04x]\n",
				vmg_tag, gpa, flags_rmp, flags);
		}
	} else {
		pr_err_ratelimited("Event logged [RMP_PAGE_FAULT device=%02x:%02x.%x, vmg_tag=0x%04x, gpa=0x%llx, flags_rmp=0x%04x, flags=0x%04x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			vmg_tag, gpa, flags_rmp, flags);
	}

	if (pdev)
		pci_dev_put(pdev);
}

#define IS_IOMMU_MEM_TRANSACTION(flags)		\
	(((flags) & EVENT_FLAG_I) == 0)

#define IS_WRITE_REQUEST(flags)			\
	((flags) & EVENT_FLAG_RW)

static void amd_iommu_report_page_fault(u16 devid, u16 domain_id,
					u64 address, int flags)
{
	struct iommu_dev_data *dev_data = NULL;
	struct pci_dev *pdev;

	pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid),
					   devid & 0xff);
	if (pdev)
		dev_data = dev_iommu_priv_get(&pdev->dev);

	if (dev_data) {
		/*
		 * If this is a DMA fault (for which the I(nterrupt)
		 * bit will be unset), allow report_iommu_fault() to
		 * prevent logging it.
		 */
		if (IS_IOMMU_MEM_TRANSACTION(flags)) {
			if (!report_iommu_fault(&dev_data->domain->domain,
						&pdev->dev, address,
						IS_WRITE_REQUEST(flags) ?
							IOMMU_FAULT_WRITE :
							IOMMU_FAULT_READ))
				goto out;
		}

		if (__ratelimit(&dev_data->rs)) {
			pci_err(pdev, "Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%llx flags=0x%04x]\n",
				domain_id, address, flags);
		}
	} else {
		pr_err_ratelimited("Event logged [IO_PAGE_FAULT device=%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			domain_id, address, flags);
	}

out:
	if (pdev)
		pci_dev_put(pdev);
}

static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
{
	struct device *dev = iommu->iommu.dev;
	int type, devid, flags, tag;
	volatile u32 *event = __evt;
	int count = 0;
	u64 address;
	u32 pasid;

retry:
	type    = (event[1] >> EVENT_TYPE_SHIFT)  & EVENT_TYPE_MASK;
	devid   = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
	pasid   = (event[0] & EVENT_DOMID_MASK_HI) |
		  (event[1] & EVENT_DOMID_MASK_LO);
	flags   = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
	address = (u64)(((u64)event[3]) << 32) | event[2];

	if (type == 0) {
		/* Did we hit the erratum? */
		if (++count == LOOP_TIMEOUT) {
			pr_err("No event written to event log\n");
			return;
		}
		udelay(1);
		goto retry;
	}

	if (type == EVENT_TYPE_IO_FAULT) {
		amd_iommu_report_page_fault(devid, pasid, address, flags);
		return;
	}

	switch (type) {
	case EVENT_TYPE_ILL_DEV:
		dev_err(dev, "Event logged [ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			pasid, address, flags);
		dump_dte_entry(iommu, devid);
		break;
	case EVENT_TYPE_DEV_TAB_ERR:
		dev_err(dev, "Event logged [DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
			"address=0x%llx flags=0x%04x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			address, flags);
		break;
	case EVENT_TYPE_PAGE_TAB_ERR:
		dev_err(dev, "Event logged [PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x pasid=0x%04x address=0x%llx flags=0x%04x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			pasid, address, flags);
		break;
	case EVENT_TYPE_ILL_CMD:
		dev_err(dev, "Event logged [ILLEGAL_COMMAND_ERROR address=0x%llx]\n", address);
		dump_command(address);
		break;
	case EVENT_TYPE_CMD_HARD_ERR:
		dev_err(dev, "Event logged [COMMAND_HARDWARE_ERROR address=0x%llx flags=0x%04x]\n",
			address, flags);
		break;
	case EVENT_TYPE_IOTLB_INV_TO:
		dev_err(dev, "Event logged [IOTLB_INV_TIMEOUT device=%02x:%02x.%x address=0x%llx]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			address);
		break;
	case EVENT_TYPE_INV_DEV_REQ:
		dev_err(dev, "Event logged [INVALID_DEVICE_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			pasid, address, flags);
		break;
	case EVENT_TYPE_RMP_FAULT:
		amd_iommu_report_rmp_fault(event);
		break;
	case EVENT_TYPE_RMP_HW_ERR:
		amd_iommu_report_rmp_hw_error(event);
		break;
	case EVENT_TYPE_INV_PPR_REQ:
		pasid = PPR_PASID(*((u64 *)__evt));
		tag = event[1] & 0x03FF;
		dev_err(dev, "Event logged [INVALID_PPR_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x tag=0x%03x]\n",
			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
			pasid, address, flags, tag);
		break;
	default:
		dev_err(dev, "Event logged [UNKNOWN event[0]=0x%08x event[1]=0x%08x event[2]=0x%08x event[3]=0x%08x\n",
			event[0], event[1], event[2], event[3]);
	}

	memset(__evt, 0, 4 * sizeof(u32));
}

static void iommu_poll_events(struct amd_iommu *iommu)
{
	u32 head, tail;

	head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
	tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);

	while (head != tail) {
		iommu_print_event(iommu, iommu->evt_buf + head);
		head = (head + EVENT_ENTRY_SIZE) % EVT_BUFFER_SIZE;
	}

	writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
}

static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw)
{
	struct amd_iommu_fault fault;

	if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
		pr_err_ratelimited("Unknown PPR request received\n");
		return;
	}

	fault.address   = raw[1];
	fault.pasid     = PPR_PASID(raw[0]);
	fault.device_id = PPR_DEVID(raw[0]);
	fault.tag       = PPR_TAG(raw[0]);
	fault.flags     = PPR_FLAGS(raw[0]);

	atomic_notifier_call_chain(&ppr_notifier, 0, &fault);
}

static void iommu_poll_ppr_log(struct amd_iommu *iommu)
{
	u32 head, tail;

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

	head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
	tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);

	while (head != tail) {
		volatile u64 *raw;
		u64 entry[2];
		int i;

		raw = (u64 *)(iommu->ppr_log + head);

		/*
		 * Hardware bug: Interrupt may arrive before the entry is
		 * written to memory. If this happens we need to wait for the
		 * entry to arrive.
		 */
		for (i = 0; i < LOOP_TIMEOUT; ++i) {
			if (PPR_REQ_TYPE(raw[0]) != 0)
				break;
			udelay(1);
		}

		/* Avoid memcpy function-call overhead */
		entry[0] = raw[0];
		entry[1] = raw[1];

		/*
		 * To detect the hardware bug we need to clear the entry
		 * back to zero.
		 */
		raw[0] = raw[1] = 0UL;

		/* Update head pointer of hardware ring-buffer */
		head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE;
		writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);

		/* Handle PPR entry */
		iommu_handle_ppr_entry(iommu, entry);

		/* Refresh ring-buffer information */
		head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
		tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
	}
}

#ifdef CONFIG_IRQ_REMAP
static int (*iommu_ga_log_notifier)(u32);

int amd_iommu_register_ga_log_notifier(int (*notifier)(u32))
{
	iommu_ga_log_notifier = notifier;

	return 0;
}
EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier);

static void iommu_poll_ga_log(struct amd_iommu *iommu)
{
	u32 head, tail, cnt = 0;

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

	head = readl(iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
	tail = readl(iommu->mmio_base + MMIO_GA_TAIL_OFFSET);

	while (head != tail) {
		volatile u64 *raw;
		u64 log_entry;

		raw = (u64 *)(iommu->ga_log + head);
		cnt++;

		/* Avoid memcpy function-call overhead */
		log_entry = *raw;

		/* Update head pointer of hardware ring-buffer */
		head = (head + GA_ENTRY_SIZE) % GA_LOG_SIZE;
		writel(head, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);

		/* Handle GA entry */
		switch (GA_REQ_TYPE(log_entry)) {
		case GA_GUEST_NR:
			if (!iommu_ga_log_notifier)
				break;

			pr_debug("%s: devid=%#x, ga_tag=%#x\n",
				 __func__, GA_DEVID(log_entry),
				 GA_TAG(log_entry));

			if (iommu_ga_log_notifier(GA_TAG(log_entry)) != 0)
				pr_err("GA log notifier failed.\n");
			break;
		default:
			break;
		}
	}
}

static void
amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu)
{
	if (!irq_remapping_enabled || !dev_is_pci(dev) ||
	    pci_dev_has_special_msi_domain(to_pci_dev(dev)))
		return;

	dev_set_msi_domain(dev, iommu->msi_domain);
}

#else /* CONFIG_IRQ_REMAP */
static inline void
amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu) { }
#endif /* !CONFIG_IRQ_REMAP */

#define AMD_IOMMU_INT_MASK	\
	(MMIO_STATUS_EVT_OVERFLOW_INT_MASK | \
	 MMIO_STATUS_EVT_INT_MASK | \
	 MMIO_STATUS_PPR_INT_MASK | \
	 MMIO_STATUS_GALOG_INT_MASK)

irqreturn_t amd_iommu_int_thread(int irq, void *data)
{
	struct amd_iommu *iommu = (struct amd_iommu *) data;
	u32 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);

	while (status & AMD_IOMMU_INT_MASK) {
		/* Enable interrupt sources again */
		writel(AMD_IOMMU_INT_MASK,
			iommu->mmio_base + MMIO_STATUS_OFFSET);

		if (status & MMIO_STATUS_EVT_INT_MASK) {
			pr_devel("Processing IOMMU Event Log\n");
			iommu_poll_events(iommu);
		}

		if (status & MMIO_STATUS_PPR_INT_MASK) {
			pr_devel("Processing IOMMU PPR Log\n");
			iommu_poll_ppr_log(iommu);
		}

#ifdef CONFIG_IRQ_REMAP
		if (status & MMIO_STATUS_GALOG_INT_MASK) {
			pr_devel("Processing IOMMU GA Log\n");
			iommu_poll_ga_log(iommu);
		}
#endif

		if (status & MMIO_STATUS_EVT_OVERFLOW_INT_MASK) {
			pr_info_ratelimited("IOMMU event log overflow\n");
			amd_iommu_restart_event_logging(iommu);
		}

		/*
		 * Hardware bug: ERBT1312
		 * When re-enabling interrupt (by writing 1
		 * to clear the bit), the hardware might also try to set
		 * the interrupt bit in the event status register.
		 * In this scenario, the bit will be set, and disable
		 * subsequent interrupts.
		 *
		 * Workaround: The IOMMU driver should read back the
		 * status register and check if the interrupt bits are cleared.
		 * If not, driver will need to go through the interrupt handler
		 * again and re-clear the bits
		 */
		status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
	}
	return IRQ_HANDLED;
}

irqreturn_t amd_iommu_int_handler(int irq, void *data)
{
	return IRQ_WAKE_THREAD;
}

/****************************************************************************
 *
 * IOMMU command queuing functions
 *
 ****************************************************************************/

static int wait_on_sem(struct amd_iommu *iommu, u64 data)
{
	int i = 0;

	while (*iommu->cmd_sem != data && i < LOOP_TIMEOUT) {
		udelay(1);
		i += 1;
	}

	if (i == LOOP_TIMEOUT) {
		pr_alert("Completion-Wait loop timed out\n");
		return -EIO;
	}

	return 0;
}

static void copy_cmd_to_buffer(struct amd_iommu *iommu,
			       struct iommu_cmd *cmd)
{
	u8 *target;
	u32 tail;

	/* Copy command to buffer */
	tail = iommu->cmd_buf_tail;
	target = iommu->cmd_buf + tail;
	memcpy(target, cmd, sizeof(*cmd));

	tail = (tail + sizeof(*cmd)) % CMD_BUFFER_SIZE;
	iommu->cmd_buf_tail = tail;

	/* Tell the IOMMU about it */
	writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
}

static void build_completion_wait(struct iommu_cmd *cmd,
				  struct amd_iommu *iommu,
				  u64 data)
{
	u64 paddr = iommu_virt_to_phys((void *)iommu->cmd_sem);

	memset(cmd, 0, sizeof(*cmd));
	cmd->data[0] = lower_32_bits(paddr) | CMD_COMPL_WAIT_STORE_MASK;
	cmd->data[1] = upper_32_bits(paddr);
	cmd->data[2] = data;
	CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
}

static void build_inv_dte(struct iommu_cmd *cmd, u16 devid)
{
	memset(cmd, 0, sizeof(*cmd));
	cmd->data[0] = devid;
	CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY);
}

/*
 * Builds an invalidation address which is suitable for one page or multiple
 * pages. Sets the size bit (S) as needed is more than one page is flushed.
 */
static inline u64 build_inv_address(u64 address, size_t size)
{
	u64 pages, end, msb_diff;

	pages = iommu_num_pages(address, size, PAGE_SIZE);

	if (pages == 1)
		return address & PAGE_MASK;

	end = address + size - 1;

	/*
	 * msb_diff would hold the index of the most significant bit that
	 * flipped between the start and end.
	 */
	msb_diff = fls64(end ^ address) - 1;

	/*
	 * Bits 63:52 are sign extended. If for some reason bit 51 is different
	 * between the start and the end, invalidate everything.
	 */
	if (unlikely(msb_diff > 51)) {
		address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
	} else {
		/*
		 * The msb-bit must be clear on the address. Just set all the
		 * lower bits.
		 */
		address |= (1ull << msb_diff) - 1;
	}

	/* Clear bits 11:0 */
	address &= PAGE_MASK;

	/* Set the size bit - we flush more than one 4kb page */
	return address | CMD_INV_IOMMU_PAGES_SIZE_MASK;
}

static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
				  size_t size, u16 domid, int pde)
{
	u64 inv_address = build_inv_address(address, size);

	memset(cmd, 0, sizeof(*cmd));
	cmd->data[1] |= domid;
	cmd->data[2]  = lower_32_bits(inv_address);
	cmd->data[3]  = upper_32_bits(inv_address);
	CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
	if (pde) /* PDE bit - we want to flush everything, not only the PTEs */
		cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
}

static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep,
				  u64 address, size_t size)
{
	u64 inv_address = build_inv_address(address, size);

	memset(cmd, 0, sizeof(*cmd));
	cmd->data[0]  = devid;
	cmd->data[0] |= (qdep & 0xff) << 24;
	cmd->data[1]  = devid;
	cmd->data[2]  = lower_32_bits(inv_address);
	cmd->data[3]  = upper_32_bits(inv_address);
	CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
}

static void build_inv_iommu_pasid(struct iommu_cmd *cmd, u16 domid, u32 pasid,
				  u64 address, bool size)
{
	memset(cmd, 0, sizeof(*cmd));

	address &= ~(0xfffULL);

	cmd->data[0]  = pasid;
	cmd->data[1]  = domid;
	cmd->data[2]  = lower_32_bits(address);
	cmd->data[3]  = upper_32_bits(address);
	cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
	cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
	if (size)
		cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
	CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
}

static void build_inv_iotlb_pasid(struct iommu_cmd *cmd, u16 devid, u32 pasid,
				  int qdep, u64 address, bool size)
{
	memset(cmd, 0, sizeof(*cmd));

	address &= ~(0xfffULL);

	cmd->data[0]  = devid;
	cmd->data[0] |= ((pasid >> 8) & 0xff) << 16;
	cmd->data[0] |= (qdep  & 0xff) << 24;
	cmd->data[1]  = devid;
	cmd->data[1] |= (pasid & 0xff) << 16;
	cmd->data[2]  = lower_32_bits(address);
	cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
	cmd->data[3]  = upper_32_bits(address);
	if (size)
		cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
	CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
}

static void build_complete_ppr(struct iommu_cmd *cmd, u16 devid, u32 pasid,
			       int status, int tag, bool gn)
{
	memset(cmd, 0, sizeof(*cmd));

	cmd->data[0]  = devid;
	if (gn) {
		cmd->data[1]  = pasid;
		cmd->data[2]  = CMD_INV_IOMMU_PAGES_GN_MASK;
	}
	cmd->data[3]  = tag & 0x1ff;
	cmd->data[3] |= (status & PPR_STATUS_MASK) << PPR_STATUS_SHIFT;

	CMD_SET_TYPE(cmd, CMD_COMPLETE_PPR);
}

static void build_inv_all(struct iommu_cmd *cmd)
{
	memset(cmd, 0, sizeof(*cmd));
	CMD_SET_TYPE(cmd, CMD_INV_ALL);
}

static void build_inv_irt(struct iommu_cmd *cmd, u16 devid)
{
	memset(cmd, 0, sizeof(*cmd));
	cmd->data[0] = devid;
	CMD_SET_TYPE(cmd, CMD_INV_IRT);
}

/*
 * Writes the command to the IOMMUs command buffer and informs the
 * hardware about the new command.
 */
static int __iommu_queue_command_sync(struct amd_iommu *iommu,
				      struct iommu_cmd *cmd,
				      bool sync)
{
	unsigned int count = 0;
	u32 left, next_tail;

	next_tail = (iommu->cmd_buf_tail + sizeof(*cmd)) % CMD_BUFFER_SIZE;
again:
	left      = (iommu->cmd_buf_head - next_tail) % CMD_BUFFER_SIZE;

	if (left <= 0x20) {
		/* Skip udelay() the first time around */
		if (count++) {
			if (count == LOOP_TIMEOUT) {
				pr_err("Command buffer timeout\n");
				return -EIO;
			}

			udelay(1);
		}

		/* Update head and recheck remaining space */
		iommu->cmd_buf_head = readl(iommu->mmio_base +
					    MMIO_CMD_HEAD_OFFSET);

		goto again;
	}

	copy_cmd_to_buffer(iommu, cmd);

	/* Do we need to make sure all commands are processed? */
	iommu->need_sync = sync;

	return 0;
}

static int iommu_queue_command_sync(struct amd_iommu *iommu,
				    struct iommu_cmd *cmd,
				    bool sync)
{
	unsigned long flags;
	int ret;

	raw_spin_lock_irqsave(&iommu->lock, flags);
	ret = __iommu_queue_command_sync(iommu, cmd, sync);
	raw_spin_unlock_irqrestore(&iommu->lock, flags);

	return ret;
}

static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
{
	return iommu_queue_command_sync(iommu, cmd, true);
}

/*
 * This function queues a completion wait command into the command
 * buffer of an IOMMU
 */
static int iommu_completion_wait(struct amd_iommu *iommu)
{
	struct iommu_cmd cmd;
	unsigned long flags;
	int ret;
	u64 data;

	if (!iommu->need_sync)
		return 0;

	raw_spin_lock_irqsave(&iommu->lock, flags);

	data = ++iommu->cmd_sem_val;
	build_completion_wait(&cmd, iommu, data);

	ret = __iommu_queue_command_sync(iommu, &cmd, false);
	if (ret)
		goto out_unlock;

	ret = wait_on_sem(iommu, data);

out_unlock:
	raw_spin_unlock_irqrestore(&iommu->lock, flags);

	return ret;
}

static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid)
{
	struct iommu_cmd cmd;

	build_inv_dte(&cmd, devid);

	return iommu_queue_command(iommu, &cmd);
}

static void amd_iommu_flush_dte_all(struct amd_iommu *iommu)
{
	u32 devid;

	for (devid = 0; devid <= 0xffff; ++devid)
		iommu_flush_dte(iommu, devid);

	iommu_completion_wait(iommu);
}

/*
 * This function uses heavy locking and may disable irqs for some time. But
 * this is no issue because it is only called during resume.
 */
static void amd_iommu_flush_tlb_all(struct amd_iommu *iommu)
{
	u32 dom_id;

	for (dom_id = 0; dom_id <= 0xffff; ++dom_id) {
		struct iommu_cmd cmd;
		build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
				      dom_id, 1);
		iommu_queue_command(iommu, &cmd);
	}

	iommu_completion_wait(iommu);
}

static void amd_iommu_flush_tlb_domid(struct amd_iommu *iommu, u32 dom_id)
{
	struct iommu_cmd cmd;

	build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
			      dom_id, 1);
	iommu_queue_command(iommu, &cmd);

	iommu_completion_wait(iommu);
}

static void amd_iommu_flush_all(struct amd_iommu *iommu)
{
	struct iommu_cmd cmd;

	build_inv_all(&cmd);

	iommu_queue_command(iommu, &cmd);
	iommu_completion_wait(iommu);
}

static void iommu_flush_irt(struct amd_iommu *iommu, u16 devid)
{
	struct iommu_cmd cmd;

	build_inv_irt(&cmd, devid);

	iommu_queue_command(iommu, &cmd);
}

static void amd_iommu_flush_irt_all(struct amd_iommu *iommu)
{
	u32 devid;

	for (devid = 0; devid <= MAX_DEV_TABLE_ENTRIES; devid++)
		iommu_flush_irt(iommu, devid);

	iommu_completion_wait(iommu);
}

void iommu_flush_all_caches(struct amd_iommu *iommu)
{
	if (iommu_feature(iommu, FEATURE_IA)) {
		amd_iommu_flush_all(iommu);
	} else {
		amd_iommu_flush_dte_all(iommu);
		amd_iommu_flush_irt_all(iommu);
		amd_iommu_flush_tlb_all(iommu);
	}
}

/*
 * Command send function for flushing on-device TLB
 */
static int device_flush_iotlb(struct iommu_dev_data *dev_data,
			      u64 address, size_t size)
{
	struct amd_iommu *iommu;
	struct iommu_cmd cmd;
	int qdep;

	qdep     = dev_data->ats.qdep;
	iommu    = rlookup_amd_iommu(dev_data->dev);
	if (!iommu)
		return -EINVAL;

	build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size);

	return iommu_queue_command(iommu, &cmd);
}

static int device_flush_dte_alias(struct pci_dev *pdev, u16 alias, void *data)
{
	struct amd_iommu *iommu = data;

	return iommu_flush_dte(iommu, alias);
}

/*
 * Command send function for invalidating a device table entry
 */
static int device_flush_dte(struct iommu_dev_data *dev_data)
{
	struct amd_iommu *iommu;
	struct pci_dev *pdev = NULL;
	struct amd_iommu_pci_seg *pci_seg;
	u16 alias;
	int ret;

	iommu = rlookup_amd_iommu(dev_data->dev);
	if (!iommu)
		return -EINVAL;

	if (dev_is_pci(dev_data->dev))
		pdev = to_pci_dev(dev_data->dev);

	if (pdev)
		ret = pci_for_each_dma_alias(pdev,
					     device_flush_dte_alias, iommu);
	else
		ret = iommu_flush_dte(iommu, dev_data->devid);
	if (ret)
		return ret;

	pci_seg = iommu->pci_seg;
	alias = pci_seg->alias_table[dev_data->devid];
	if (alias != dev_data->devid) {
		ret = iommu_flush_dte(iommu, alias);
		if (ret)
			return ret;
	}

	if (dev_data->ats.enabled)
		ret = device_flush_iotlb(dev_data, 0, ~0UL);

	return ret;
}

/*
 * TLB invalidation function which is called from the mapping functions.
 * It invalidates a single PTE if the range to flush is within a single
 * page. Otherwise it flushes the whole TLB of the IOMMU.
 */
static void __domain_flush_pages(struct protection_domain *domain,
				 u64 address, size_t size, int pde)
{
	struct iommu_dev_data *dev_data;
	struct iommu_cmd cmd;
	int ret = 0, i;

	build_inv_iommu_pages(&cmd, address, size, domain->id, pde);

	for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
		if (!domain->dev_iommu[i])
			continue;

		/*
		 * Devices of this domain are behind this IOMMU
		 * We need a TLB flush
		 */
		ret |= iommu_queue_command(amd_iommus[i], &cmd);
	}

	list_for_each_entry(dev_data, &domain->dev_list, list) {

		if (!dev_data->ats.enabled)
			continue;

		ret |= device_flush_iotlb(dev_data, address, size);
	}

	WARN_ON(ret);
}

static void domain_flush_pages(struct protection_domain *domain,
			       u64 address, size_t size, int pde)
{
	if (likely(!amd_iommu_np_cache)) {
		__domain_flush_pages(domain, address, size, pde);
		return;
	}

	/*
	 * When NpCache is on, we infer that we run in a VM and use a vIOMMU.
	 * In such setups it is best to avoid flushes of ranges which are not
	 * naturally aligned, since it would lead to flushes of unmodified
	 * PTEs. Such flushes would require the hypervisor to do more work than
	 * necessary. Therefore, perform repeated flushes of aligned ranges
	 * until you cover the range. Each iteration flushes the smaller
	 * between the natural alignment of the address that we flush and the
	 * greatest naturally aligned region that fits in the range.
	 */
	while (size != 0) {
		int addr_alignment = __ffs(address);
		int size_alignment = __fls(size);
		int min_alignment;
		size_t flush_size;

		/*
		 * size is always non-zero, but address might be zero, causing
		 * addr_alignment to be negative. As the casting of the
		 * argument in __ffs(address) to long might trim the high bits
		 * of the address on x86-32, cast to long when doing the check.
		 */
		if (likely((unsigned long)address != 0))
			min_alignment = min(addr_alignment, size_alignment);
		else
			min_alignment = size_alignment;

		flush_size = 1ul << min_alignment;

		__domain_flush_pages(domain, address, flush_size, pde);
		address += flush_size;
		size -= flush_size;
	}
}

/* Flush the whole IO/TLB for a given protection domain - including PDE */
void amd_iommu_domain_flush_tlb_pde(struct protection_domain *domain)
{
	domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1);
}

void amd_iommu_domain_flush_complete(struct protection_domain *domain)
{
	int i;

	for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
		if (domain && !domain->dev_iommu[i])
			continue;

		/*
		 * Devices of this domain are behind this IOMMU
		 * We need to wait for completion of all commands.
		 */
		iommu_completion_wait(amd_iommus[i]);
	}
}

/* Flush the not present cache if it exists */
static void domain_flush_np_cache(struct protection_domain *domain,
		dma_addr_t iova, size_t size)
{
	if (unlikely(amd_iommu_np_cache)) {
		unsigned long flags;

		spin_lock_irqsave(&domain->lock, flags);
		domain_flush_pages(domain, iova, size, 1);
		amd_iommu_domain_flush_complete(domain);
		spin_unlock_irqrestore(&domain->lock, flags);
	}
}


/*
 * This function flushes the DTEs for all devices in domain
 */
static void domain_flush_devices(struct protection_domain *domain)
{
	struct iommu_dev_data *dev_data;

	list_for_each_entry(dev_data, &domain->dev_list, list)
		device_flush_dte(dev_data);
}

/****************************************************************************
 *
 * The next functions belong to the domain allocation. A domain is
 * allocated for every IOMMU as the default domain. If device isolation
 * is enabled, every device get its own domain. The most important thing
 * about domains is the page table mapping the DMA address space they
 * contain.
 *
 ****************************************************************************/

static u16 domain_id_alloc(void)
{
	int id;

	spin_lock(&pd_bitmap_lock);
	id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
	BUG_ON(id == 0);
	if (id > 0 && id < MAX_DOMAIN_ID)
		__set_bit(id, amd_iommu_pd_alloc_bitmap);
	else
		id = 0;
	spin_unlock(&pd_bitmap_lock);

	return id;
}

static void domain_id_free(int id)
{
	spin_lock(&pd_bitmap_lock);
	if (id > 0 && id < MAX_DOMAIN_ID)
		__clear_bit(id, amd_iommu_pd_alloc_bitmap);
	spin_unlock(&pd_bitmap_lock);
}

static void free_gcr3_tbl_level1(u64 *tbl)
{
	u64 *ptr;
	int i;

	for (i = 0; i < 512; ++i) {
		if (!(tbl[i] & GCR3_VALID))
			continue;

		ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK);

		free_page((unsigned long)ptr);
	}
}

static void free_gcr3_tbl_level2(u64 *tbl)
{
	u64 *ptr;
	int i;

	for (i = 0; i < 512; ++i) {
		if (!(tbl[i] & GCR3_VALID))
			continue;

		ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK);

		free_gcr3_tbl_level1(ptr);
	}
}

static void free_gcr3_table(struct protection_domain *domain)
{
	if (domain->glx == 2)
		free_gcr3_tbl_level2(domain->gcr3_tbl);
	else if (domain->glx == 1)
		free_gcr3_tbl_level1(domain->gcr3_tbl);
	else
		BUG_ON(domain->glx != 0);

	free_page((unsigned long)domain->gcr3_tbl);
}

static void set_dte_entry(struct amd_iommu *iommu, u16 devid,
			  struct protection_domain *domain, bool ats, bool ppr)
{
	u64 pte_root = 0;
	u64 flags = 0;
	u32 old_domid;
	struct dev_table_entry *dev_table = get_dev_table(iommu);

	if (domain->iop.mode != PAGE_MODE_NONE)
		pte_root = iommu_virt_to_phys(domain->iop.root);

	pte_root |= (domain->iop.mode & DEV_ENTRY_MODE_MASK)
		    << DEV_ENTRY_MODE_SHIFT;
	pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV;

	flags = dev_table[devid].data[1];

	if (ats)
		flags |= DTE_FLAG_IOTLB;

	if (ppr) {
		if (iommu_feature(iommu, FEATURE_EPHSUP))
			pte_root |= 1ULL << DEV_ENTRY_PPR;
	}

	if (domain->flags & PD_IOMMUV2_MASK) {
		u64 gcr3 = iommu_virt_to_phys(domain->gcr3_tbl);
		u64 glx  = domain->glx;
		u64 tmp;

		pte_root |= DTE_FLAG_GV;
		pte_root |= (glx & DTE_GLX_MASK) << DTE_GLX_SHIFT;

		/* First mask out possible old values for GCR3 table */
		tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
		flags    &= ~tmp;

		tmp = DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
		flags    &= ~tmp;

		/* Encode GCR3 table into DTE */
		tmp = DTE_GCR3_VAL_A(gcr3) << DTE_GCR3_SHIFT_A;
		pte_root |= tmp;

		tmp = DTE_GCR3_VAL_B(gcr3) << DTE_GCR3_SHIFT_B;
		flags    |= tmp;

		tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C;
		flags    |= tmp;
	}

	flags &= ~DEV_DOMID_MASK;
	flags |= domain->id;

	old_domid = dev_table[devid].data[1] & DEV_DOMID_MASK;
	dev_table[devid].data[1]  = flags;
	dev_table[devid].data[0]  = pte_root;

	/*
	 * A kdump kernel might be replacing a domain ID that was copied from
	 * the previous kernel--if so, it needs to flush the translation cache
	 * entries for the old domain ID that is being overwritten
	 */
	if (old_domid) {
		amd_iommu_flush_tlb_domid(iommu, old_domid);
	}
}

static void clear_dte_entry(struct amd_iommu *iommu, u16 devid)
{
	struct dev_table_entry *dev_table = get_dev_table(iommu);

	/* remove entry from the device table seen by the hardware */
	dev_table[devid].data[0]  = DTE_FLAG_V | DTE_FLAG_TV;
	dev_table[devid].data[1] &= DTE_FLAG_MASK;

	amd_iommu_apply_erratum_63(iommu, devid);
}

static void do_attach(struct iommu_dev_data *dev_data,
		      struct protection_domain *domain)
{
	struct amd_iommu *iommu;
	bool ats;

	iommu = rlookup_amd_iommu(dev_data->dev);
	if (!iommu)
		return;
	ats   = dev_data->ats.enabled;

	/* Update data structures */
	dev_data->domain = domain;
	list_add(&dev_data->list, &domain->dev_list);

	/* Do reference counting */
	domain->dev_iommu[iommu->index] += 1;
	domain->dev_cnt                 += 1;

	/* Update device table */
	set_dte_entry(iommu, dev_data->devid, domain,
		      ats, dev_data->iommu_v2);
	clone_aliases(iommu, dev_data->dev);

	device_flush_dte(dev_data);
}

static void do_detach(struct iommu_dev_data *dev_data)
{
	struct protection_domain *domain = dev_data->domain;
	struct amd_iommu *iommu;

	iommu = rlookup_amd_iommu(dev_data->dev);
	if (!iommu)
		return;

	/* Update data structures */
	dev_data->domain = NULL;
	list_del(&dev_data->list);
	clear_dte_entry(iommu, dev_data->devid);
	clone_aliases(iommu, dev_data->dev);

	/* Flush the DTE entry */
	device_flush_dte(dev_data);

	/* Flush IOTLB */
	amd_iommu_domain_flush_tlb_pde(domain);

	/* Wait for the flushes to finish */
	amd_iommu_domain_flush_complete(domain);

	/* decrease reference counters - needs to happen after the flushes */
	domain->dev_iommu[iommu->index] -= 1;
	domain->dev_cnt                 -= 1;
}

static void pdev_iommuv2_disable(struct pci_dev *pdev)
{
	pci_disable_ats(pdev);
	pci_disable_pri(pdev);
	pci_disable_pasid(pdev);
}

static int pdev_iommuv2_enable(struct pci_dev *pdev)
{
	int ret;

	/* Only allow access to user-accessible pages */
	ret = pci_enable_pasid(pdev, 0);
	if (ret)
		goto out_err;

	/* First reset the PRI state of the device */
	ret = pci_reset_pri(pdev);
	if (ret)
		goto out_err;

	/* Enable PRI */
	/* FIXME: Hardcode number of outstanding requests for now */
	ret = pci_enable_pri(pdev, 32);
	if (ret)
		goto out_err;

	ret = pci_enable_ats(pdev, PAGE_SHIFT);
	if (ret)
		goto out_err;

	return 0;

out_err:
	pci_disable_pri(pdev);
	pci_disable_pasid(pdev);

	return ret;
}

/*
 * If a device is not yet associated with a domain, this function makes the
 * device visible in the domain
 */
static int attach_device(struct device *dev,
			 struct protection_domain *domain)
{
	struct iommu_dev_data *dev_data;
	struct pci_dev *pdev;
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&domain->lock, flags);

	dev_data = dev_iommu_priv_get(dev);

	spin_lock(&dev_data->lock);

	ret = -EBUSY;
	if (dev_data->domain != NULL)
		goto out;

	if (!dev_is_pci(dev))
		goto skip_ats_check;

	pdev = to_pci_dev(dev);
	if (domain->flags & PD_IOMMUV2_MASK) {
		struct iommu_domain *def_domain = iommu_get_dma_domain(dev);

		ret = -EINVAL;
		if (def_domain->type != IOMMU_DOMAIN_IDENTITY)
			goto out;

		if (dev_data->iommu_v2) {
			if (pdev_iommuv2_enable(pdev) != 0)
				goto out;

			dev_data->ats.enabled = true;
			dev_data->ats.qdep    = pci_ats_queue_depth(pdev);
			dev_data->pri_tlp     = pci_prg_resp_pasid_required(pdev);
		}
	} else if (amd_iommu_iotlb_sup &&
		   pci_enable_ats(pdev, PAGE_SHIFT) == 0) {
		dev_data->ats.enabled = true;
		dev_data->ats.qdep    = pci_ats_queue_depth(pdev);
	}

skip_ats_check:
	ret = 0;

	do_attach(dev_data, domain);

	/*
	 * We might boot into a crash-kernel here. The crashed kernel
	 * left the caches in the IOMMU dirty. So we have to flush
	 * here to evict all dirty stuff.
	 */
	amd_iommu_domain_flush_tlb_pde(domain);

	amd_iommu_domain_flush_complete(domain);

out:
	spin_unlock(&dev_data->lock);

	spin_unlock_irqrestore(&domain->lock, flags);

	return ret;
}

/*
 * Removes a device from a protection domain (with devtable_lock held)
 */
static void detach_device(struct device *dev)
{
	struct protection_domain *domain;
	struct iommu_dev_data *dev_data;
	unsigned long flags;

	dev_data = dev_iommu_priv_get(dev);
	domain   = dev_data->domain;

	spin_lock_irqsave(&domain->lock, flags);

	spin_lock(&dev_data->lock);

	/*
	 * First check if the device is still attached. It might already
	 * be detached from its domain because the generic
	 * iommu_detach_group code detached it and we try again here in
	 * our alias handling.
	 */
	if (WARN_ON(!dev_data->domain))
		goto out;

	do_detach(dev_data);

	if (!dev_is_pci(dev))
		goto out;

	if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2)
		pdev_iommuv2_disable(to_pci_dev(dev));
	else if (dev_data->ats.enabled)
		pci_disable_ats(to_pci_dev(dev));

	dev_data->ats.enabled = false;

out:
	spin_unlock(&dev_data->lock);

	spin_unlock_irqrestore(&domain->lock, flags);
}

static struct iommu_device *amd_iommu_probe_device(struct device *dev)
{
	struct iommu_device *iommu_dev;
	struct amd_iommu *iommu;
	int ret;

	if (!check_device(dev))
		return ERR_PTR(-ENODEV);

	iommu = rlookup_amd_iommu(dev);
	if (!iommu)
		return ERR_PTR(-ENODEV);

	if (dev_iommu_priv_get(dev))
		return &iommu->iommu;

	ret = iommu_init_device(iommu, dev);
	if (ret) {
		if (ret != -ENOTSUPP)
			dev_err(dev, "Failed to initialize - trying to proceed anyway\n");
		iommu_dev = ERR_PTR(ret);
		iommu_ignore_device(iommu, dev);
	} else {
		amd_iommu_set_pci_msi_domain(dev, iommu);
		iommu_dev = &iommu->iommu;
	}

	iommu_completion_wait(iommu);

	return iommu_dev;
}

static void amd_iommu_probe_finalize(struct device *dev)
{
	/* Domains are initialized for this device - have a look what we ended up with */
	set_dma_ops(dev, NULL);
	iommu_setup_dma_ops(dev, 0, U64_MAX);
}

static void amd_iommu_release_device(struct device *dev)
{
	struct amd_iommu *iommu;

	if (!check_device(dev))
		return;

	iommu = rlookup_amd_iommu(dev);
	if (!iommu)
		return;

	amd_iommu_uninit_device(dev);
	iommu_completion_wait(iommu);
}

static struct iommu_group *amd_iommu_device_group(struct device *dev)
{
	if (dev_is_pci(dev))
		return pci_device_group(dev);

	return acpihid_device_group(dev);
}

/*****************************************************************************
 *
 * The next functions belong to the dma_ops mapping/unmapping code.
 *
 *****************************************************************************/

static void update_device_table(struct protection_domain *domain)
{
	struct iommu_dev_data *dev_data;

	list_for_each_entry(dev_data, &domain->dev_list, list) {
		struct amd_iommu *iommu = rlookup_amd_iommu(dev_data->dev);

		if (!iommu)
			continue;
		set_dte_entry(iommu, dev_data->devid, domain,
			      dev_data->ats.enabled, dev_data->iommu_v2);
		clone_aliases(iommu, dev_data->dev);
	}
}

void amd_iommu_update_and_flush_device_table(struct protection_domain *domain)
{
	update_device_table(domain);
	domain_flush_devices(domain);
}

void amd_iommu_domain_update(struct protection_domain *domain)
{
	/* Update device table */
	amd_iommu_update_and_flush_device_table(domain);

	/* Flush domain TLB(s) and wait for completion */
	amd_iommu_domain_flush_tlb_pde(domain);
	amd_iommu_domain_flush_complete(domain);
}

int __init amd_iommu_init_api(void)
{
	int err;

	err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
	if (err)
		return err;
#ifdef CONFIG_ARM_AMBA
	err = bus_set_iommu(&amba_bustype, &amd_iommu_ops);
	if (err)
		return err;
#endif
	err = bus_set_iommu(&platform_bus_type, &amd_iommu_ops);
	if (err)
		return err;

	return 0;
}

/*****************************************************************************
 *
 * The following functions belong to the exported interface of AMD IOMMU
 *
 * This interface allows access to lower level functions of the IOMMU
 * like protection domain handling and assignement of devices to domains
 * which is not possible with the dma_ops interface.
 *
 *****************************************************************************/

static void cleanup_domain(struct protection_domain *domain)
{
	struct iommu_dev_data *entry;
	unsigned long flags;

	spin_lock_irqsave(&domain->lock, flags);

	while (!list_empty(&domain->dev_list)) {
		entry = list_first_entry(&domain->dev_list,
					 struct iommu_dev_data, list);
		BUG_ON(!entry->domain);
		do_detach(entry);
	}

	spin_unlock_irqrestore(&domain->lock, flags);
}

static void protection_domain_free(struct protection_domain *domain)
{
	if (!domain)
		return;

	if (domain->id)
		domain_id_free(domain->id);

	if (domain->iop.pgtbl_cfg.tlb)
		free_io_pgtable_ops(&domain->iop.iop.ops);

	kfree(domain);
}

static int protection_domain_init_v1(struct protection_domain *domain, int mode)
{
	u64 *pt_root = NULL;

	BUG_ON(mode < PAGE_MODE_NONE || mode > PAGE_MODE_6_LEVEL);

	spin_lock_init(&domain->lock);
	domain->id = domain_id_alloc();
	if (!domain->id)
		return -ENOMEM;
	INIT_LIST_HEAD(&domain->dev_list);

	if (mode != PAGE_MODE_NONE) {
		pt_root = (void *)get_zeroed_page(GFP_KERNEL);
		if (!pt_root)
			return -ENOMEM;
	}

	amd_iommu_domain_set_pgtable(domain, pt_root, mode);

	return 0;
}

static struct protection_domain *protection_domain_alloc(unsigned int type)
{
	struct io_pgtable_ops *pgtbl_ops;
	struct protection_domain *domain;
	int pgtable = amd_iommu_pgtable;
	int mode = DEFAULT_PGTABLE_LEVEL;
	int ret;

	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
	if (!domain)
		return NULL;

	/*
	 * Force IOMMU v1 page table when iommu=pt and
	 * when allocating domain for pass-through devices.
	 */
	if (type == IOMMU_DOMAIN_IDENTITY) {
		pgtable = AMD_IOMMU_V1;
		mode = PAGE_MODE_NONE;
	} else if (type == IOMMU_DOMAIN_UNMANAGED) {
		pgtable = AMD_IOMMU_V1;
	}

	switch (pgtable) {
	case AMD_IOMMU_V1:
		ret = protection_domain_init_v1(domain, mode);
		break;
	default:
		ret = -EINVAL;
	}

	if (ret)
		goto out_err;

	pgtbl_ops = alloc_io_pgtable_ops(pgtable, &domain->iop.pgtbl_cfg, domain);
	if (!pgtbl_ops)
		goto out_err;

	return domain;
out_err:
	kfree(domain);
	return NULL;
}

static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
{
	struct protection_domain *domain;

	domain = protection_domain_alloc(type);
	if (!domain)
		return NULL;

	domain->domain.geometry.aperture_start = 0;
	domain->domain.geometry.aperture_end   = ~0ULL;
	domain->domain.geometry.force_aperture = true;

	return &domain->domain;
}

static void amd_iommu_domain_free(struct iommu_domain *dom)
{
	struct protection_domain *domain;

	domain = to_pdomain(dom);

	if (domain->dev_cnt > 0)
		cleanup_domain(domain);

	BUG_ON(domain->dev_cnt != 0);

	if (!dom)
		return;

	if (domain->flags & PD_IOMMUV2_MASK)
		free_gcr3_table(domain);

	protection_domain_free(domain);
}

static void amd_iommu_detach_device(struct iommu_domain *dom,
				    struct device *dev)
{
	struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev);
	struct amd_iommu *iommu;

	if (!check_device(dev))
		return;

	if (dev_data->domain != NULL)
		detach_device(dev);

	iommu = rlookup_amd_iommu(dev);
	if (!iommu)
		return;

#ifdef CONFIG_IRQ_REMAP
	if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
	    (dom->type == IOMMU_DOMAIN_UNMANAGED))
		dev_data->use_vapic = 0;
#endif

	iommu_completion_wait(iommu);
}

static int amd_iommu_attach_device(struct iommu_domain *dom,
				   struct device *dev)
{
	struct protection_domain *domain = to_pdomain(dom);
	struct iommu_dev_data *dev_data;
	struct amd_iommu *iommu;
	int ret;

	if (!check_device(dev))
		return -EINVAL;

	dev_data = dev_iommu_priv_get(dev);
	dev_data->defer_attach = false;

	iommu = rlookup_amd_iommu(dev);
	if (!iommu)
		return -EINVAL;

	if (dev_data->domain)
		detach_device(dev);

	ret = attach_device(dev, domain);

#ifdef CONFIG_IRQ_REMAP
	if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
		if (dom->type == IOMMU_DOMAIN_UNMANAGED)
			dev_data->use_vapic = 1;
		else
			dev_data->use_vapic = 0;
	}
#endif

	iommu_completion_wait(iommu);

	return ret;
}

static void amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
				     unsigned long iova, size_t size)
{
	struct protection_domain *domain = to_pdomain(dom);
	struct io_pgtable_ops *ops = &domain->iop.iop.ops;

	if (ops->map)
		domain_flush_np_cache(domain, iova, size);
}

static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
			 phys_addr_t paddr, size_t page_size, int iommu_prot,
			 gfp_t gfp)
{
	struct protection_domain *domain = to_pdomain(dom);
	struct io_pgtable_ops *ops = &domain->iop.iop.ops;
	int prot = 0;
	int ret = -EINVAL;

	if ((amd_iommu_pgtable == AMD_IOMMU_V1) &&
	    (domain->iop.mode == PAGE_MODE_NONE))
		return -EINVAL;

	if (iommu_prot & IOMMU_READ)
		prot |= IOMMU_PROT_IR;
	if (iommu_prot & IOMMU_WRITE)
		prot |= IOMMU_PROT_IW;

	if (ops->map)
		ret = ops->map(ops, iova, paddr, page_size, prot, gfp);

	return ret;
}

static void amd_iommu_iotlb_gather_add_page(struct iommu_domain *domain,
					    struct iommu_iotlb_gather *gather,
					    unsigned long iova, size_t size)
{
	/*
	 * AMD's IOMMU can flush as many pages as necessary in a single flush.
	 * Unless we run in a virtual machine, which can be inferred according
	 * to whether "non-present cache" is on, it is probably best to prefer
	 * (potentially) too extensive TLB flushing (i.e., more misses) over
	 * mutliple TLB flushes (i.e., more flushes). For virtual machines the
	 * hypervisor needs to synchronize the host IOMMU PTEs with those of
	 * the guest, and the trade-off is different: unnecessary TLB flushes
	 * should be avoided.
	 */
	if (amd_iommu_np_cache &&
	    iommu_iotlb_gather_is_disjoint(gather, iova, size))
		iommu_iotlb_sync(domain, gather);

	iommu_iotlb_gather_add_range(gather, iova, size);
}

static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
			      size_t page_size,
			      struct iommu_iotlb_gather *gather)
{
	struct protection_domain *domain = to_pdomain(dom);
	struct io_pgtable_ops *ops = &domain->iop.iop.ops;
	size_t r;

	if ((amd_iommu_pgtable == AMD_IOMMU_V1) &&
	    (domain->iop.mode == PAGE_MODE_NONE))
		return 0;

	r = (ops->unmap) ? ops->unmap(ops, iova, page_size, gather) : 0;

	amd_iommu_iotlb_gather_add_page(dom, gather, iova, page_size);

	return r;
}

static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
					  dma_addr_t iova)
{
	struct protection_domain *domain = to_pdomain(dom);
	struct io_pgtable_ops *ops = &domain->iop.iop.ops;

	return ops->iova_to_phys(ops, iova);
}

static bool amd_iommu_capable(enum iommu_cap cap)
{
	switch (cap) {
	case IOMMU_CAP_CACHE_COHERENCY:
		return true;
	case IOMMU_CAP_INTR_REMAP:
		return (irq_remapping_enabled == 1);
	case IOMMU_CAP_NOEXEC:
		return false;
	case IOMMU_CAP_PRE_BOOT_PROTECTION:
		return amdr_ivrs_remap_support;
	default:
		break;
	}

	return false;
}

static void amd_iommu_get_resv_regions(struct device *dev,
				       struct list_head *head)
{
	struct iommu_resv_region *region;
	struct unity_map_entry *entry;
	struct amd_iommu *iommu;
	struct amd_iommu_pci_seg *pci_seg;
	int devid;

	devid = get_device_id(dev);
	if (devid < 0)
		return;
	iommu = rlookup_amd_iommu(dev);
	if (!iommu)
		return;
	pci_seg = iommu->pci_seg;

	list_for_each_entry(entry, &pci_seg->unity_map, list) {
		int type, prot = 0;
		size_t length;

		if (devid < entry->devid_start || devid > entry->devid_end)
			continue;

		type   = IOMMU_RESV_DIRECT;
		length = entry->address_end - entry->address_start;
		if (entry->prot & IOMMU_PROT_IR)
			prot |= IOMMU_READ;
		if (entry->prot & IOMMU_PROT_IW)
			prot |= IOMMU_WRITE;
		if (entry->prot & IOMMU_UNITY_MAP_FLAG_EXCL_RANGE)
			/* Exclusion range */
			type = IOMMU_RESV_RESERVED;

		region = iommu_alloc_resv_region(entry->address_start,
						 length, prot, type);
		if (!region) {
			dev_err(dev, "Out of memory allocating dm-regions\n");
			return;
		}
		list_add_tail(&region->list, head);
	}

	region = iommu_alloc_resv_region(MSI_RANGE_START,
					 MSI_RANGE_END - MSI_RANGE_START + 1,
					 0, IOMMU_RESV_MSI);
	if (!region)
		return;
	list_add_tail(&region->list, head);

	region = iommu_alloc_resv_region(HT_RANGE_START,
					 HT_RANGE_END - HT_RANGE_START + 1,
					 0, IOMMU_RESV_RESERVED);
	if (!region)
		return;
	list_add_tail(&region->list, head);
}

bool amd_iommu_is_attach_deferred(struct device *dev)
{
	struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev);

	return dev_data->defer_attach;
}
EXPORT_SYMBOL_GPL(amd_iommu_is_attach_deferred);

static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain)
{
	struct protection_domain *dom = to_pdomain(domain);
	unsigned long flags;

	spin_lock_irqsave(&dom->lock, flags);
	amd_iommu_domain_flush_tlb_pde(dom);
	amd_iommu_domain_flush_complete(dom);
	spin_unlock_irqrestore(&dom->lock, flags);
}

static void amd_iommu_iotlb_sync(struct iommu_domain *domain,
				 struct iommu_iotlb_gather *gather)
{
	struct protection_domain *dom = to_pdomain(domain);
	unsigned long flags;

	spin_lock_irqsave(&dom->lock, flags);
	domain_flush_pages(dom, gather->start, gather->end - gather->start, 1);
	amd_iommu_domain_flush_complete(dom);
	spin_unlock_irqrestore(&dom->lock, flags);
}

static int amd_iommu_def_domain_type(struct device *dev)
{
	struct iommu_dev_data *dev_data;

	dev_data = dev_iommu_priv_get(dev);
	if (!dev_data)
		return 0;

	/*
	 * Do not identity map IOMMUv2 capable devices when memory encryption is
	 * active, because some of those devices (AMD GPUs) don't have the
	 * encryption bit in their DMA-mask and require remapping.
	 */
	if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT) && dev_data->iommu_v2)
		return IOMMU_DOMAIN_IDENTITY;

	return 0;
}

static bool amd_iommu_enforce_cache_coherency(struct iommu_domain *domain)
{
	/* IOMMU_PTE_FC is always set */
	return true;
}

const struct iommu_ops amd_iommu_ops = {
	.capable = amd_iommu_capable,
	.domain_alloc = amd_iommu_domain_alloc,
	.probe_device = amd_iommu_probe_device,
	.release_device = amd_iommu_release_device,
	.probe_finalize = amd_iommu_probe_finalize,
	.device_group = amd_iommu_device_group,
	.get_resv_regions = amd_iommu_get_resv_regions,
	.put_resv_regions = generic_iommu_put_resv_regions,
	.is_attach_deferred = amd_iommu_is_attach_deferred,
	.pgsize_bitmap	= AMD_IOMMU_PGSIZES,
	.def_domain_type = amd_iommu_def_domain_type,
	.default_domain_ops = &(const struct iommu_domain_ops) {
		.attach_dev	= amd_iommu_attach_device,
		.detach_dev	= amd_iommu_detach_device,
		.map		= amd_iommu_map,
		.unmap		= amd_iommu_unmap,
		.iotlb_sync_map	= amd_iommu_iotlb_sync_map,
		.iova_to_phys	= amd_iommu_iova_to_phys,
		.flush_iotlb_all = amd_iommu_flush_iotlb_all,
		.iotlb_sync	= amd_iommu_iotlb_sync,
		.free		= amd_iommu_domain_free,
		.enforce_cache_coherency = amd_iommu_enforce_cache_coherency,
	}
};

/*****************************************************************************
 *
 * The next functions do a basic initialization of IOMMU for pass through
 * mode
 *
 * In passthrough mode the IOMMU is initialized and enabled but not used for
 * DMA-API translation.
 *
 *****************************************************************************/

/* IOMMUv2 specific functions */
int amd_iommu_register_ppr_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&ppr_notifier, nb);
}
EXPORT_SYMBOL(amd_iommu_register_ppr_notifier);

int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&ppr_notifier, nb);
}
EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);

void amd_iommu_domain_direct_map(struct iommu_domain *dom)
{
	struct protection_domain *domain = to_pdomain(dom);
	unsigned long flags;

	spin_lock_irqsave(&domain->lock, flags);

	if (domain->iop.pgtbl_cfg.tlb)
		free_io_pgtable_ops(&domain->iop.iop.ops);

	spin_unlock_irqrestore(&domain->lock, flags);
}
EXPORT_SYMBOL(amd_iommu_domain_direct_map);

int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
{
	struct protection_domain *domain = to_pdomain(dom);
	unsigned long flags;
	int levels, ret;

	/* Number of GCR3 table levels required */
	for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
		levels += 1;

	if (levels > amd_iommu_max_glx_val)
		return -EINVAL;

	spin_lock_irqsave(&domain->lock, flags);

	/*
	 * Save us all sanity checks whether devices already in the
	 * domain support IOMMUv2. Just force that the domain has no
	 * devices attached when it is switched into IOMMUv2 mode.
	 */
	ret = -EBUSY;
	if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK)
		goto out;

	ret = -ENOMEM;
	domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
	if (domain->gcr3_tbl == NULL)
		goto out;

	domain->glx      = levels;
	domain->flags   |= PD_IOMMUV2_MASK;

	amd_iommu_domain_update(domain);

	ret = 0;

out:
	spin_unlock_irqrestore(&domain->lock, flags);

	return ret;
}
EXPORT_SYMBOL(amd_iommu_domain_enable_v2);

static int __flush_pasid(struct protection_domain *domain, u32 pasid,
			 u64 address, bool size)
{
	struct iommu_dev_data *dev_data;
	struct iommu_cmd cmd;
	int i, ret;

	if (!(domain->flags & PD_IOMMUV2_MASK))
		return -EINVAL;

	build_inv_iommu_pasid(&cmd, domain->id, pasid, address, size);

	/*
	 * IOMMU TLB needs to be flushed before Device TLB to
	 * prevent device TLB refill from IOMMU TLB
	 */
	for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
		if (domain->dev_iommu[i] == 0)
			continue;

		ret = iommu_queue_command(amd_iommus[i], &cmd);
		if (ret != 0)
			goto out;
	}

	/* Wait until IOMMU TLB flushes are complete */
	amd_iommu_domain_flush_complete(domain);

	/* Now flush device TLBs */
	list_for_each_entry(dev_data, &domain->dev_list, list) {
		struct amd_iommu *iommu;
		int qdep;

		/*
		   There might be non-IOMMUv2 capable devices in an IOMMUv2
		 * domain.
		 */
		if (!dev_data->ats.enabled)
			continue;

		qdep  = dev_data->ats.qdep;
		iommu = rlookup_amd_iommu(dev_data->dev);
		if (!iommu)
			continue;
		build_inv_iotlb_pasid(&cmd, dev_data->devid, pasid,
				      qdep, address, size);

		ret = iommu_queue_command(iommu, &cmd);
		if (ret != 0)
			goto out;
	}

	/* Wait until all device TLBs are flushed */
	amd_iommu_domain_flush_complete(domain);

	ret = 0;

out:

	return ret;
}

static int __amd_iommu_flush_page(struct protection_domain *domain, u32 pasid,
				  u64 address)
{
	return __flush_pasid(domain, pasid, address, false);
}

int amd_iommu_flush_page(struct iommu_domain *dom, u32 pasid,
			 u64 address)
{
	struct protection_domain *domain = to_pdomain(dom);
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&domain->lock, flags);
	ret = __amd_iommu_flush_page(domain, pasid, address);
	spin_unlock_irqrestore(&domain->lock, flags);

	return ret;
}
EXPORT_SYMBOL(amd_iommu_flush_page);

static int __amd_iommu_flush_tlb(struct protection_domain *domain, u32 pasid)
{
	return __flush_pasid(domain, pasid, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
			     true);
}

int amd_iommu_flush_tlb(struct iommu_domain *dom, u32 pasid)
{
	struct protection_domain *domain = to_pdomain(dom);
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&domain->lock, flags);
	ret = __amd_iommu_flush_tlb(domain, pasid);
	spin_unlock_irqrestore(&domain->lock, flags);

	return ret;
}
EXPORT_SYMBOL(amd_iommu_flush_tlb);

static u64 *__get_gcr3_pte(u64 *root, int level, u32 pasid, bool alloc)
{
	int index;
	u64 *pte;

	while (true) {

		index = (pasid >> (9 * level)) & 0x1ff;
		pte   = &root[index];

		if (level == 0)
			break;

		if (!(*pte & GCR3_VALID)) {
			if (!alloc)
				return NULL;

			root = (void *)get_zeroed_page(GFP_ATOMIC);
			if (root == NULL)
				return NULL;

			*pte = iommu_virt_to_phys(root) | GCR3_VALID;
		}

		root = iommu_phys_to_virt(*pte & PAGE_MASK);

		level -= 1;
	}

	return pte;
}

static int __set_gcr3(struct protection_domain *domain, u32 pasid,
		      unsigned long cr3)
{
	u64 *pte;

	if (domain->iop.mode != PAGE_MODE_NONE)
		return -EINVAL;

	pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true);
	if (pte == NULL)
		return -ENOMEM;

	*pte = (cr3 & PAGE_MASK) | GCR3_VALID;

	return __amd_iommu_flush_tlb(domain, pasid);
}

static int __clear_gcr3(struct protection_domain *domain, u32 pasid)
{
	u64 *pte;

	if (domain->iop.mode != PAGE_MODE_NONE)
		return -EINVAL;

	pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false);
	if (pte == NULL)
		return 0;

	*pte = 0;

	return __amd_iommu_flush_tlb(domain, pasid);
}

int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, u32 pasid,
			      unsigned long cr3)
{
	struct protection_domain *domain = to_pdomain(dom);
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&domain->lock, flags);
	ret = __set_gcr3(domain, pasid, cr3);
	spin_unlock_irqrestore(&domain->lock, flags);

	return ret;
}
EXPORT_SYMBOL(amd_iommu_domain_set_gcr3);

int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, u32 pasid)
{
	struct protection_domain *domain = to_pdomain(dom);
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&domain->lock, flags);
	ret = __clear_gcr3(domain, pasid);
	spin_unlock_irqrestore(&domain->lock, flags);

	return ret;
}
EXPORT_SYMBOL(amd_iommu_domain_clear_gcr3);

int amd_iommu_complete_ppr(struct pci_dev *pdev, u32 pasid,
			   int status, int tag)
{
	struct iommu_dev_data *dev_data;
	struct amd_iommu *iommu;
	struct iommu_cmd cmd;

	dev_data = dev_iommu_priv_get(&pdev->dev);
	iommu    = rlookup_amd_iommu(&pdev->dev);
	if (!iommu)
		return -ENODEV;

	build_complete_ppr(&cmd, dev_data->devid, pasid, status,
			   tag, dev_data->pri_tlp);

	return iommu_queue_command(iommu, &cmd);
}
EXPORT_SYMBOL(amd_iommu_complete_ppr);

int amd_iommu_device_info(struct pci_dev *pdev,
                          struct amd_iommu_device_info *info)
{
	int max_pasids;
	int pos;

	if (pdev == NULL || info == NULL)
		return -EINVAL;

	if (!amd_iommu_v2_supported())
		return -EINVAL;

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

	if (pci_ats_supported(pdev))
		info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP;

	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
	if (pos)
		info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP;

	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
	if (pos) {
		int features;

		max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1));
		max_pasids = min(max_pasids, (1 << 20));

		info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
		info->max_pasids = min(pci_max_pasids(pdev), max_pasids);

		features = pci_pasid_features(pdev);
		if (features & PCI_PASID_CAP_EXEC)
			info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP;
		if (features & PCI_PASID_CAP_PRIV)
			info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP;
	}

	return 0;
}
EXPORT_SYMBOL(amd_iommu_device_info);

#ifdef CONFIG_IRQ_REMAP

/*****************************************************************************
 *
 * Interrupt Remapping Implementation
 *
 *****************************************************************************/

static struct irq_chip amd_ir_chip;
static DEFINE_SPINLOCK(iommu_table_lock);

static void set_dte_irq_entry(struct amd_iommu *iommu, u16 devid,
			      struct irq_remap_table *table)
{
	u64 dte;
	struct dev_table_entry *dev_table = get_dev_table(iommu);

	dte	= dev_table[devid].data[2];
	dte	&= ~DTE_IRQ_PHYS_ADDR_MASK;
	dte	|= iommu_virt_to_phys(table->table);
	dte	|= DTE_IRQ_REMAP_INTCTL;
	dte	|= DTE_INTTABLEN;
	dte	|= DTE_IRQ_REMAP_ENABLE;

	dev_table[devid].data[2] = dte;
}

static struct irq_remap_table *get_irq_table(struct amd_iommu *iommu, u16 devid)
{
	struct irq_remap_table *table;
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;

	if (WARN_ONCE(!pci_seg->rlookup_table[devid],
		      "%s: no iommu for devid %x:%x\n",
		      __func__, pci_seg->id, devid))
		return NULL;

	table = pci_seg->irq_lookup_table[devid];
	if (WARN_ONCE(!table, "%s: no table for devid %x:%x\n",
		      __func__, pci_seg->id, devid))
		return NULL;

	return table;
}

static struct irq_remap_table *__alloc_irq_table(void)
{
	struct irq_remap_table *table;

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
		return NULL;

	table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_KERNEL);
	if (!table->table) {
		kfree(table);
		return NULL;
	}
	raw_spin_lock_init(&table->lock);

	if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
		memset(table->table, 0,
		       MAX_IRQS_PER_TABLE * sizeof(u32));
	else
		memset(table->table, 0,
		       (MAX_IRQS_PER_TABLE * (sizeof(u64) * 2)));
	return table;
}

static void set_remap_table_entry(struct amd_iommu *iommu, u16 devid,
				  struct irq_remap_table *table)
{
	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;

	pci_seg->irq_lookup_table[devid] = table;
	set_dte_irq_entry(iommu, devid, table);
	iommu_flush_dte(iommu, devid);
}

static int set_remap_table_entry_alias(struct pci_dev *pdev, u16 alias,
				       void *data)
{
	struct irq_remap_table *table = data;
	struct amd_iommu_pci_seg *pci_seg;
	struct amd_iommu *iommu = rlookup_amd_iommu(&pdev->dev);

	if (!iommu)
		return -EINVAL;

	pci_seg = iommu->pci_seg;
	pci_seg->irq_lookup_table[alias] = table;
	set_dte_irq_entry(iommu, alias, table);
	iommu_flush_dte(pci_seg->rlookup_table[alias], alias);

	return 0;
}

static struct irq_remap_table *alloc_irq_table(struct amd_iommu *iommu,
					       u16 devid, struct pci_dev *pdev)
{
	struct irq_remap_table *table = NULL;
	struct irq_remap_table *new_table = NULL;
	struct amd_iommu_pci_seg *pci_seg;
	unsigned long flags;
	u16 alias;

	spin_lock_irqsave(&iommu_table_lock, flags);

	pci_seg = iommu->pci_seg;
	table = pci_seg->irq_lookup_table[devid];
	if (table)
		goto out_unlock;

	alias = pci_seg->alias_table[devid];
	table = pci_seg->irq_lookup_table[alias];
	if (table) {
		set_remap_table_entry(iommu, devid, table);
		goto out_wait;
	}
	spin_unlock_irqrestore(&iommu_table_lock, flags);

	/* Nothing there yet, allocate new irq remapping table */
	new_table = __alloc_irq_table();
	if (!new_table)
		return NULL;

	spin_lock_irqsave(&iommu_table_lock, flags);

	table = pci_seg->irq_lookup_table[devid];
	if (table)
		goto out_unlock;

	table = pci_seg->irq_lookup_table[alias];
	if (table) {
		set_remap_table_entry(iommu, devid, table);
		goto out_wait;
	}

	table = new_table;
	new_table = NULL;

	if (pdev)
		pci_for_each_dma_alias(pdev, set_remap_table_entry_alias,
				       table);
	else
		set_remap_table_entry(iommu, devid, table);

	if (devid != alias)
		set_remap_table_entry(iommu, alias, table);

out_wait:
	iommu_completion_wait(iommu);

out_unlock:
	spin_unlock_irqrestore(&iommu_table_lock, flags);

	if (new_table) {
		kmem_cache_free(amd_iommu_irq_cache, new_table->table);
		kfree(new_table);
	}
	return table;
}

static int alloc_irq_index(struct amd_iommu *iommu, u16 devid, int count,
			   bool align, struct pci_dev *pdev)
{
	struct irq_remap_table *table;
	int index, c, alignment = 1;
	unsigned long flags;

	table = alloc_irq_table(iommu, devid, pdev);
	if (!table)
		return -ENODEV;

	if (align)
		alignment = roundup_pow_of_two(count);

	raw_spin_lock_irqsave(&table->lock, flags);

	/* Scan table for free entries */
	for (index = ALIGN(table->min_index, alignment), c = 0;
	     index < MAX_IRQS_PER_TABLE;) {
		if (!iommu->irte_ops->is_allocated(table, index)) {
			c += 1;
		} else {
			c     = 0;
			index = ALIGN(index + 1, alignment);
			continue;
		}

		if (c == count)	{
			for (; c != 0; --c)
				iommu->irte_ops->set_allocated(table, index - c + 1);

			index -= count - 1;
			goto out;
		}

		index++;
	}

	index = -ENOSPC;

out:
	raw_spin_unlock_irqrestore(&table->lock, flags);

	return index;
}

static int modify_irte_ga(struct amd_iommu *iommu, u16 devid, int index,
			  struct irte_ga *irte, struct amd_ir_data *data)
{
	bool ret;
	struct irq_remap_table *table;
	unsigned long flags;
	struct irte_ga *entry;

	table = get_irq_table(iommu, devid);
	if (!table)
		return -ENOMEM;

	raw_spin_lock_irqsave(&table->lock, flags);

	entry = (struct irte_ga *)table->table;
	entry = &entry[index];

	ret = cmpxchg_double(&entry->lo.val, &entry->hi.val,
			     entry->lo.val, entry->hi.val,
			     irte->lo.val, irte->hi.val);
	/*
	 * We use cmpxchg16 to atomically update the 128-bit IRTE,
	 * and it cannot be updated by the hardware or other processors
	 * behind us, so the return value of cmpxchg16 should be the
	 * same as the old value.
	 */
	WARN_ON(!ret);

	if (data)
		data->ref = entry;

	raw_spin_unlock_irqrestore(&table->lock, flags);

	iommu_flush_irt(iommu, devid);
	iommu_completion_wait(iommu);

	return 0;
}

static int modify_irte(struct amd_iommu *iommu,
		       u16 devid, int index, union irte *irte)
{
	struct irq_remap_table *table;
	unsigned long flags;

	table = get_irq_table(iommu, devid);
	if (!table)
		return -ENOMEM;

	raw_spin_lock_irqsave(&table->lock, flags);
	table->table[index] = irte->val;
	raw_spin_unlock_irqrestore(&table->lock, flags);

	iommu_flush_irt(iommu, devid);
	iommu_completion_wait(iommu);

	return 0;
}

static void free_irte(struct amd_iommu *iommu, u16 devid, int index)
{
	struct irq_remap_table *table;
	unsigned long flags;

	table = get_irq_table(iommu, devid);
	if (!table)
		return;

	raw_spin_lock_irqsave(&table->lock, flags);
	iommu->irte_ops->clear_allocated(table, index);
	raw_spin_unlock_irqrestore(&table->lock, flags);

	iommu_flush_irt(iommu, devid);
	iommu_completion_wait(iommu);
}

static void irte_prepare(void *entry,
			 u32 delivery_mode, bool dest_mode,
			 u8 vector, u32 dest_apicid, int devid)
{
	union irte *irte = (union irte *) entry;

	irte->val                = 0;
	irte->fields.vector      = vector;
	irte->fields.int_type    = delivery_mode;
	irte->fields.destination = dest_apicid;
	irte->fields.dm          = dest_mode;
	irte->fields.valid       = 1;
}

static void irte_ga_prepare(void *entry,
			    u32 delivery_mode, bool dest_mode,
			    u8 vector, u32 dest_apicid, int devid)
{
	struct irte_ga *irte = (struct irte_ga *) entry;

	irte->lo.val                      = 0;
	irte->hi.val                      = 0;
	irte->lo.fields_remap.int_type    = delivery_mode;
	irte->lo.fields_remap.dm          = dest_mode;
	irte->hi.fields.vector            = vector;
	irte->lo.fields_remap.destination = APICID_TO_IRTE_DEST_LO(dest_apicid);
	irte->hi.fields.destination       = APICID_TO_IRTE_DEST_HI(dest_apicid);
	irte->lo.fields_remap.valid       = 1;
}

static void irte_activate(struct amd_iommu *iommu, void *entry, u16 devid, u16 index)
{
	union irte *irte = (union irte *) entry;

	irte->fields.valid = 1;
	modify_irte(iommu, devid, index, irte);
}

static void irte_ga_activate(struct amd_iommu *iommu, void *entry, u16 devid, u16 index)
{
	struct irte_ga *irte = (struct irte_ga *) entry;

	irte->lo.fields_remap.valid = 1;
	modify_irte_ga(iommu, devid, index, irte, NULL);
}

static void irte_deactivate(struct amd_iommu *iommu, void *entry, u16 devid, u16 index)
{
	union irte *irte = (union irte *) entry;

	irte->fields.valid = 0;
	modify_irte(iommu, devid, index, irte);
}

static void irte_ga_deactivate(struct amd_iommu *iommu, void *entry, u16 devid, u16 index)
{
	struct irte_ga *irte = (struct irte_ga *) entry;

	irte->lo.fields_remap.valid = 0;
	modify_irte_ga(iommu, devid, index, irte, NULL);
}

static void irte_set_affinity(struct amd_iommu *iommu, void *entry, u16 devid, u16 index,
			      u8 vector, u32 dest_apicid)
{
	union irte *irte = (union irte *) entry;

	irte->fields.vector = vector;
	irte->fields.destination = dest_apicid;
	modify_irte(iommu, devid, index, irte);
}

static void irte_ga_set_affinity(struct amd_iommu *iommu, void *entry, u16 devid, u16 index,
				 u8 vector, u32 dest_apicid)
{
	struct irte_ga *irte = (struct irte_ga *) entry;

	if (!irte->lo.fields_remap.guest_mode) {
		irte->hi.fields.vector = vector;
		irte->lo.fields_remap.destination =
					APICID_TO_IRTE_DEST_LO(dest_apicid);
		irte->hi.fields.destination =
					APICID_TO_IRTE_DEST_HI(dest_apicid);
		modify_irte_ga(iommu, devid, index, irte, NULL);
	}
}

#define IRTE_ALLOCATED (~1U)
static void irte_set_allocated(struct irq_remap_table *table, int index)
{
	table->table[index] = IRTE_ALLOCATED;
}

static void irte_ga_set_allocated(struct irq_remap_table *table, int index)
{
	struct irte_ga *ptr = (struct irte_ga *)table->table;
	struct irte_ga *irte = &ptr[index];

	memset(&irte->lo.val, 0, sizeof(u64));
	memset(&irte->hi.val, 0, sizeof(u64));
	irte->hi.fields.vector = 0xff;
}

static bool irte_is_allocated(struct irq_remap_table *table, int index)
{
	union irte *ptr = (union irte *)table->table;
	union irte *irte = &ptr[index];

	return irte->val != 0;
}

static bool irte_ga_is_allocated(struct irq_remap_table *table, int index)
{
	struct irte_ga *ptr = (struct irte_ga *)table->table;
	struct irte_ga *irte = &ptr[index];

	return irte->hi.fields.vector != 0;
}

static void irte_clear_allocated(struct irq_remap_table *table, int index)
{
	table->table[index] = 0;
}

static void irte_ga_clear_allocated(struct irq_remap_table *table, int index)
{
	struct irte_ga *ptr = (struct irte_ga *)table->table;
	struct irte_ga *irte = &ptr[index];

	memset(&irte->lo.val, 0, sizeof(u64));
	memset(&irte->hi.val, 0, sizeof(u64));
}

static int get_devid(struct irq_alloc_info *info)
{
	switch (info->type) {
	case X86_IRQ_ALLOC_TYPE_IOAPIC:
		return get_ioapic_devid(info->devid);
	case X86_IRQ_ALLOC_TYPE_HPET:
		return get_hpet_devid(info->devid);
	case X86_IRQ_ALLOC_TYPE_PCI_MSI:
	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
		return get_device_id(msi_desc_to_dev(info->desc));
	default:
		WARN_ON_ONCE(1);
		return -1;
	}
}

struct irq_remap_ops amd_iommu_irq_ops = {
	.prepare		= amd_iommu_prepare,
	.enable			= amd_iommu_enable,
	.disable		= amd_iommu_disable,
	.reenable		= amd_iommu_reenable,
	.enable_faulting	= amd_iommu_enable_faulting,
};

static void fill_msi_msg(struct msi_msg *msg, u32 index)
{
	msg->data = index;
	msg->address_lo = 0;
	msg->arch_addr_lo.base_address = X86_MSI_BASE_ADDRESS_LOW;
	msg->address_hi = X86_MSI_BASE_ADDRESS_HIGH;
}

static void irq_remapping_prepare_irte(struct amd_ir_data *data,
				       struct irq_cfg *irq_cfg,
				       struct irq_alloc_info *info,
				       int devid, int index, int sub_handle)
{
	struct irq_2_irte *irte_info = &data->irq_2_irte;
	struct amd_iommu *iommu = data->iommu;

	if (!iommu)
		return;

	data->irq_2_irte.devid = devid;
	data->irq_2_irte.index = index + sub_handle;
	iommu->irte_ops->prepare(data->entry, apic->delivery_mode,
				 apic->dest_mode_logical, irq_cfg->vector,
				 irq_cfg->dest_apicid, devid);

	switch (info->type) {
	case X86_IRQ_ALLOC_TYPE_IOAPIC:
	case X86_IRQ_ALLOC_TYPE_HPET:
	case X86_IRQ_ALLOC_TYPE_PCI_MSI:
	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
		fill_msi_msg(&data->msi_entry, irte_info->index);
		break;

	default:
		BUG_ON(1);
		break;
	}
}

struct amd_irte_ops irte_32_ops = {
	.prepare = irte_prepare,
	.activate = irte_activate,
	.deactivate = irte_deactivate,
	.set_affinity = irte_set_affinity,
	.set_allocated = irte_set_allocated,
	.is_allocated = irte_is_allocated,
	.clear_allocated = irte_clear_allocated,
};

struct amd_irte_ops irte_128_ops = {
	.prepare = irte_ga_prepare,
	.activate = irte_ga_activate,
	.deactivate = irte_ga_deactivate,
	.set_affinity = irte_ga_set_affinity,
	.set_allocated = irte_ga_set_allocated,
	.is_allocated = irte_ga_is_allocated,
	.clear_allocated = irte_ga_clear_allocated,
};

static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
			       unsigned int nr_irqs, void *arg)
{
	struct irq_alloc_info *info = arg;
	struct irq_data *irq_data;
	struct amd_ir_data *data = NULL;
	struct amd_iommu *iommu;
	struct irq_cfg *cfg;
	int i, ret, devid, seg, sbdf;
	int index;

	if (!info)
		return -EINVAL;
	if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_PCI_MSI &&
	    info->type != X86_IRQ_ALLOC_TYPE_PCI_MSIX)
		return -EINVAL;

	/*
	 * With IRQ remapping enabled, don't need contiguous CPU vectors
	 * to support multiple MSI interrupts.
	 */
	if (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI)
		info->flags &= ~X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;

	sbdf = get_devid(info);
	if (sbdf < 0)
		return -EINVAL;

	seg = PCI_SBDF_TO_SEGID(sbdf);
	devid = PCI_SBDF_TO_DEVID(sbdf);
	iommu = __rlookup_amd_iommu(seg, devid);
	if (!iommu)
		return -EINVAL;

	ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
	if (ret < 0)
		return ret;

	if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
		struct irq_remap_table *table;

		table = alloc_irq_table(iommu, devid, NULL);
		if (table) {
			if (!table->min_index) {
				/*
				 * Keep the first 32 indexes free for IOAPIC
				 * interrupts.
				 */
				table->min_index = 32;
				for (i = 0; i < 32; ++i)
					iommu->irte_ops->set_allocated(table, i);
			}
			WARN_ON(table->min_index != 32);
			index = info->ioapic.pin;
		} else {
			index = -ENOMEM;
		}
	} else if (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI ||
		   info->type == X86_IRQ_ALLOC_TYPE_PCI_MSIX) {
		bool align = (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI);

		index = alloc_irq_index(iommu, devid, nr_irqs, align,
					msi_desc_to_pci_dev(info->desc));
	} else {
		index = alloc_irq_index(iommu, devid, nr_irqs, false, NULL);
	}

	if (index < 0) {
		pr_warn("Failed to allocate IRTE\n");
		ret = index;
		goto out_free_parent;
	}

	for (i = 0; i < nr_irqs; i++) {
		irq_data = irq_domain_get_irq_data(domain, virq + i);
		cfg = irq_data ? irqd_cfg(irq_data) : NULL;
		if (!cfg) {
			ret = -EINVAL;
			goto out_free_data;
		}

		ret = -ENOMEM;
		data = kzalloc(sizeof(*data), GFP_KERNEL);
		if (!data)
			goto out_free_data;

		if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
			data->entry = kzalloc(sizeof(union irte), GFP_KERNEL);
		else
			data->entry = kzalloc(sizeof(struct irte_ga),
						     GFP_KERNEL);
		if (!data->entry) {
			kfree(data);
			goto out_free_data;
		}

		data->iommu = iommu;
		irq_data->hwirq = (devid << 16) + i;
		irq_data->chip_data = data;
		irq_data->chip = &amd_ir_chip;
		irq_remapping_prepare_irte(data, cfg, info, devid, index, i);
		irq_set_status_flags(virq + i, IRQ_MOVE_PCNTXT);
	}

	return 0;

out_free_data:
	for (i--; i >= 0; i--) {
		irq_data = irq_domain_get_irq_data(domain, virq + i);
		if (irq_data)
			kfree(irq_data->chip_data);
	}
	for (i = 0; i < nr_irqs; i++)
		free_irte(iommu, devid, index + i);
out_free_parent:
	irq_domain_free_irqs_common(domain, virq, nr_irqs);
	return ret;
}

static void irq_remapping_free(struct irq_domain *domain, unsigned int virq,
			       unsigned int nr_irqs)
{
	struct irq_2_irte *irte_info;
	struct irq_data *irq_data;
	struct amd_ir_data *data;
	int i;

	for (i = 0; i < nr_irqs; i++) {
		irq_data = irq_domain_get_irq_data(domain, virq  + i);
		if (irq_data && irq_data->chip_data) {
			data = irq_data->chip_data;
			irte_info = &data->irq_2_irte;
			free_irte(data->iommu, irte_info->devid, irte_info->index);
			kfree(data->entry);
			kfree(data);
		}
	}
	irq_domain_free_irqs_common(domain, virq, nr_irqs);
}

static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu,
			       struct amd_ir_data *ir_data,
			       struct irq_2_irte *irte_info,
			       struct irq_cfg *cfg);

static int irq_remapping_activate(struct irq_domain *domain,
				  struct irq_data *irq_data, bool reserve)
{
	struct amd_ir_data *data = irq_data->chip_data;
	struct irq_2_irte *irte_info = &data->irq_2_irte;
	struct amd_iommu *iommu = data->iommu;
	struct irq_cfg *cfg = irqd_cfg(irq_data);

	if (!iommu)
		return 0;

	iommu->irte_ops->activate(iommu, data->entry, irte_info->devid,
				  irte_info->index);
	amd_ir_update_irte(irq_data, iommu, data, irte_info, cfg);
	return 0;
}

static void irq_remapping_deactivate(struct irq_domain *domain,
				     struct irq_data *irq_data)
{
	struct amd_ir_data *data = irq_data->chip_data;
	struct irq_2_irte *irte_info = &data->irq_2_irte;
	struct amd_iommu *iommu = data->iommu;

	if (iommu)
		iommu->irte_ops->deactivate(iommu, data->entry, irte_info->devid,
					    irte_info->index);
}

static int irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec,
				enum irq_domain_bus_token bus_token)
{
	struct amd_iommu *iommu;
	int devid = -1;

	if (!amd_iommu_irq_remap)
		return 0;

	if (x86_fwspec_is_ioapic(fwspec))
		devid = get_ioapic_devid(fwspec->param[0]);
	else if (x86_fwspec_is_hpet(fwspec))
		devid = get_hpet_devid(fwspec->param[0]);

	if (devid < 0)
		return 0;
	iommu = __rlookup_amd_iommu((devid >> 16), (devid & 0xffff));

	return iommu && iommu->ir_domain == d;
}

static const struct irq_domain_ops amd_ir_domain_ops = {
	.select = irq_remapping_select,
	.alloc = irq_remapping_alloc,
	.free = irq_remapping_free,
	.activate = irq_remapping_activate,
	.deactivate = irq_remapping_deactivate,
};

int amd_iommu_activate_guest_mode(void *data)
{
	struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
	struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
	u64 valid;

	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
	    !entry || entry->lo.fields_vapic.guest_mode)
		return 0;

	valid = entry->lo.fields_vapic.valid;

	entry->lo.val = 0;
	entry->hi.val = 0;

	entry->lo.fields_vapic.valid       = valid;
	entry->lo.fields_vapic.guest_mode  = 1;
	entry->lo.fields_vapic.ga_log_intr = 1;
	entry->hi.fields.ga_root_ptr       = ir_data->ga_root_ptr;
	entry->hi.fields.vector            = ir_data->ga_vector;
	entry->lo.fields_vapic.ga_tag      = ir_data->ga_tag;

	return modify_irte_ga(ir_data->iommu, ir_data->irq_2_irte.devid,
			      ir_data->irq_2_irte.index, entry, ir_data);
}
EXPORT_SYMBOL(amd_iommu_activate_guest_mode);

int amd_iommu_deactivate_guest_mode(void *data)
{
	struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
	struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
	struct irq_cfg *cfg = ir_data->cfg;
	u64 valid;

	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
	    !entry || !entry->lo.fields_vapic.guest_mode)
		return 0;

	valid = entry->lo.fields_remap.valid;

	entry->lo.val = 0;
	entry->hi.val = 0;

	entry->lo.fields_remap.valid       = valid;
	entry->lo.fields_remap.dm          = apic->dest_mode_logical;
	entry->lo.fields_remap.int_type    = apic->delivery_mode;
	entry->hi.fields.vector            = cfg->vector;
	entry->lo.fields_remap.destination =
				APICID_TO_IRTE_DEST_LO(cfg->dest_apicid);
	entry->hi.fields.destination =
				APICID_TO_IRTE_DEST_HI(cfg->dest_apicid);

	return modify_irte_ga(ir_data->iommu, ir_data->irq_2_irte.devid,
			      ir_data->irq_2_irte.index, entry, ir_data);
}
EXPORT_SYMBOL(amd_iommu_deactivate_guest_mode);

static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
{
	int ret;
	struct amd_iommu_pi_data *pi_data = vcpu_info;
	struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
	struct amd_ir_data *ir_data = data->chip_data;
	struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
	struct iommu_dev_data *dev_data;

	if (ir_data->iommu == NULL)
		return -EINVAL;

	dev_data = search_dev_data(ir_data->iommu, irte_info->devid);

	/* Note:
	 * This device has never been set up for guest mode.
	 * we should not modify the IRTE
	 */
	if (!dev_data || !dev_data->use_vapic)
		return 0;

	ir_data->cfg = irqd_cfg(data);
	pi_data->ir_data = ir_data;

	/* Note:
	 * SVM tries to set up for VAPIC mode, but we are in
	 * legacy mode. So, we force legacy mode instead.
	 */
	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
		pr_debug("%s: Fall back to using intr legacy remap\n",
			 __func__);
		pi_data->is_guest_mode = false;
	}

	pi_data->prev_ga_tag = ir_data->cached_ga_tag;
	if (pi_data->is_guest_mode) {
		ir_data->ga_root_ptr = (pi_data->base >> 12);
		ir_data->ga_vector = vcpu_pi_info->vector;
		ir_data->ga_tag = pi_data->ga_tag;
		ret = amd_iommu_activate_guest_mode(ir_data);
		if (!ret)
			ir_data->cached_ga_tag = pi_data->ga_tag;
	} else {
		ret = amd_iommu_deactivate_guest_mode(ir_data);

		/*
		 * This communicates the ga_tag back to the caller
		 * so that it can do all the necessary clean up.
		 */
		if (!ret)
			ir_data->cached_ga_tag = 0;
	}

	return ret;
}


static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu,
			       struct amd_ir_data *ir_data,
			       struct irq_2_irte *irte_info,
			       struct irq_cfg *cfg)
{

	/*
	 * Atomically updates the IRTE with the new destination, vector
	 * and flushes the interrupt entry cache.
	 */
	iommu->irte_ops->set_affinity(iommu, ir_data->entry, irte_info->devid,
				      irte_info->index, cfg->vector,
				      cfg->dest_apicid);
}

static int amd_ir_set_affinity(struct irq_data *data,
			       const struct cpumask *mask, bool force)
{
	struct amd_ir_data *ir_data = data->chip_data;
	struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
	struct irq_cfg *cfg = irqd_cfg(data);
	struct irq_data *parent = data->parent_data;
	struct amd_iommu *iommu = ir_data->iommu;
	int ret;

	if (!iommu)
		return -ENODEV;

	ret = parent->chip->irq_set_affinity(parent, mask, force);
	if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE)
		return ret;

	amd_ir_update_irte(data, iommu, ir_data, irte_info, cfg);
	/*
	 * After this point, all the interrupts will start arriving
	 * at the new destination. So, time to cleanup the previous
	 * vector allocation.
	 */
	send_cleanup_vector(cfg);

	return IRQ_SET_MASK_OK_DONE;
}

static void ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg)
{
	struct amd_ir_data *ir_data = irq_data->chip_data;

	*msg = ir_data->msi_entry;
}

static struct irq_chip amd_ir_chip = {
	.name			= "AMD-IR",
	.irq_ack		= apic_ack_irq,
	.irq_set_affinity	= amd_ir_set_affinity,
	.irq_set_vcpu_affinity	= amd_ir_set_vcpu_affinity,
	.irq_compose_msi_msg	= ir_compose_msi_msg,
};

int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
{
	struct fwnode_handle *fn;

	fn = irq_domain_alloc_named_id_fwnode("AMD-IR", iommu->index);
	if (!fn)
		return -ENOMEM;
	iommu->ir_domain = irq_domain_create_tree(fn, &amd_ir_domain_ops, iommu);
	if (!iommu->ir_domain) {
		irq_domain_free_fwnode(fn);
		return -ENOMEM;
	}

	iommu->ir_domain->parent = arch_get_ir_parent_domain();
	iommu->msi_domain = arch_create_remap_msi_irq_domain(iommu->ir_domain,
							     "AMD-IR-MSI",
							     iommu->index);
	return 0;
}

int amd_iommu_update_ga(int cpu, bool is_run, void *data)
{
	unsigned long flags;
	struct amd_iommu *iommu;
	struct irq_remap_table *table;
	struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
	int devid = ir_data->irq_2_irte.devid;
	struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
	struct irte_ga *ref = (struct irte_ga *) ir_data->ref;

	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
	    !ref || !entry || !entry->lo.fields_vapic.guest_mode)
		return 0;

	iommu = ir_data->iommu;
	if (!iommu)
		return -ENODEV;

	table = get_irq_table(iommu, devid);
	if (!table)
		return -ENODEV;

	raw_spin_lock_irqsave(&table->lock, flags);

	if (ref->lo.fields_vapic.guest_mode) {
		if (cpu >= 0) {
			ref->lo.fields_vapic.destination =
						APICID_TO_IRTE_DEST_LO(cpu);
			ref->hi.fields.destination =
						APICID_TO_IRTE_DEST_HI(cpu);
		}
		ref->lo.fields_vapic.is_run = is_run;
		barrier();
	}

	raw_spin_unlock_irqrestore(&table->lock, flags);

	iommu_flush_irt(iommu, devid);
	iommu_completion_wait(iommu);
	return 0;
}
EXPORT_SYMBOL(amd_iommu_update_ga);
#endif