summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
blob: f8ccfd6be0eee886cb2fa8b033af771cf3323ae3 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * intel_pt_decoder.c: Intel Processor Trace support
 * Copyright (c) 2013-2014, Intel Corporation.
 */

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <inttypes.h>
#include <linux/compiler.h>
#include <linux/string.h>
#include <linux/zalloc.h>

#include "../auxtrace.h"

#include "intel-pt-insn-decoder.h"
#include "intel-pt-pkt-decoder.h"
#include "intel-pt-decoder.h"
#include "intel-pt-log.h"

#define INTEL_PT_BLK_SIZE 1024

#define BIT63 (((uint64_t)1 << 63))

#define INTEL_PT_RETURN 1

/* Maximum number of loops with no packets consumed i.e. stuck in a loop */
#define INTEL_PT_MAX_LOOPS 10000

struct intel_pt_blk {
	struct intel_pt_blk *prev;
	uint64_t ip[INTEL_PT_BLK_SIZE];
};

struct intel_pt_stack {
	struct intel_pt_blk *blk;
	struct intel_pt_blk *spare;
	int pos;
};

enum intel_pt_pkt_state {
	INTEL_PT_STATE_NO_PSB,
	INTEL_PT_STATE_NO_IP,
	INTEL_PT_STATE_ERR_RESYNC,
	INTEL_PT_STATE_IN_SYNC,
	INTEL_PT_STATE_TNT_CONT,
	INTEL_PT_STATE_TNT,
	INTEL_PT_STATE_TIP,
	INTEL_PT_STATE_TIP_PGD,
	INTEL_PT_STATE_FUP,
	INTEL_PT_STATE_FUP_NO_TIP,
};

static inline bool intel_pt_sample_time(enum intel_pt_pkt_state pkt_state)
{
	switch (pkt_state) {
	case INTEL_PT_STATE_NO_PSB:
	case INTEL_PT_STATE_NO_IP:
	case INTEL_PT_STATE_ERR_RESYNC:
	case INTEL_PT_STATE_IN_SYNC:
	case INTEL_PT_STATE_TNT_CONT:
		return true;
	case INTEL_PT_STATE_TNT:
	case INTEL_PT_STATE_TIP:
	case INTEL_PT_STATE_TIP_PGD:
	case INTEL_PT_STATE_FUP:
	case INTEL_PT_STATE_FUP_NO_TIP:
		return false;
	default:
		return true;
	};
}

#ifdef INTEL_PT_STRICT
#define INTEL_PT_STATE_ERR1	INTEL_PT_STATE_NO_PSB
#define INTEL_PT_STATE_ERR2	INTEL_PT_STATE_NO_PSB
#define INTEL_PT_STATE_ERR3	INTEL_PT_STATE_NO_PSB
#define INTEL_PT_STATE_ERR4	INTEL_PT_STATE_NO_PSB
#else
#define INTEL_PT_STATE_ERR1	(decoder->pkt_state)
#define INTEL_PT_STATE_ERR2	INTEL_PT_STATE_NO_IP
#define INTEL_PT_STATE_ERR3	INTEL_PT_STATE_ERR_RESYNC
#define INTEL_PT_STATE_ERR4	INTEL_PT_STATE_IN_SYNC
#endif

struct intel_pt_decoder {
	int (*get_trace)(struct intel_pt_buffer *buffer, void *data);
	int (*walk_insn)(struct intel_pt_insn *intel_pt_insn,
			 uint64_t *insn_cnt_ptr, uint64_t *ip, uint64_t to_ip,
			 uint64_t max_insn_cnt, void *data);
	bool (*pgd_ip)(uint64_t ip, void *data);
	int (*lookahead)(void *data, intel_pt_lookahead_cb_t cb, void *cb_data);
	void *data;
	struct intel_pt_state state;
	const unsigned char *buf;
	size_t len;
	bool return_compression;
	bool branch_enable;
	bool mtc_insn;
	bool pge;
	bool have_tma;
	bool have_cyc;
	bool fixup_last_mtc;
	bool have_last_ip;
	bool in_psb;
	enum intel_pt_param_flags flags;
	uint64_t pos;
	uint64_t last_ip;
	uint64_t ip;
	uint64_t cr3;
	uint64_t timestamp;
	uint64_t tsc_timestamp;
	uint64_t ref_timestamp;
	uint64_t buf_timestamp;
	uint64_t sample_timestamp;
	uint64_t ret_addr;
	uint64_t ctc_timestamp;
	uint64_t ctc_delta;
	uint64_t cycle_cnt;
	uint64_t cyc_ref_timestamp;
	uint32_t last_mtc;
	uint32_t tsc_ctc_ratio_n;
	uint32_t tsc_ctc_ratio_d;
	uint32_t tsc_ctc_mult;
	uint32_t tsc_slip;
	uint32_t ctc_rem_mask;
	int mtc_shift;
	struct intel_pt_stack stack;
	enum intel_pt_pkt_state pkt_state;
	enum intel_pt_pkt_ctx pkt_ctx;
	enum intel_pt_pkt_ctx prev_pkt_ctx;
	enum intel_pt_blk_type blk_type;
	int blk_type_pos;
	struct intel_pt_pkt packet;
	struct intel_pt_pkt tnt;
	int pkt_step;
	int pkt_len;
	int last_packet_type;
	unsigned int cbr;
	unsigned int cbr_seen;
	unsigned int max_non_turbo_ratio;
	double max_non_turbo_ratio_fp;
	double cbr_cyc_to_tsc;
	double calc_cyc_to_tsc;
	bool have_calc_cyc_to_tsc;
	int exec_mode;
	unsigned int insn_bytes;
	uint64_t period;
	enum intel_pt_period_type period_type;
	uint64_t tot_insn_cnt;
	uint64_t period_insn_cnt;
	uint64_t period_mask;
	uint64_t period_ticks;
	uint64_t last_masked_timestamp;
	uint64_t tot_cyc_cnt;
	uint64_t sample_tot_cyc_cnt;
	uint64_t base_cyc_cnt;
	uint64_t cyc_cnt_timestamp;
	double tsc_to_cyc;
	bool continuous_period;
	bool overflow;
	bool set_fup_tx_flags;
	bool set_fup_ptw;
	bool set_fup_mwait;
	bool set_fup_pwre;
	bool set_fup_exstop;
	bool set_fup_bep;
	bool sample_cyc;
	unsigned int fup_tx_flags;
	unsigned int tx_flags;
	uint64_t fup_ptw_payload;
	uint64_t fup_mwait_payload;
	uint64_t fup_pwre_payload;
	uint64_t cbr_payload;
	uint64_t timestamp_insn_cnt;
	uint64_t sample_insn_cnt;
	uint64_t stuck_ip;
	int no_progress;
	int stuck_ip_prd;
	int stuck_ip_cnt;
	const unsigned char *next_buf;
	size_t next_len;
	unsigned char temp_buf[INTEL_PT_PKT_MAX_SZ];
};

static uint64_t intel_pt_lower_power_of_2(uint64_t x)
{
	int i;

	for (i = 0; x != 1; i++)
		x >>= 1;

	return x << i;
}

static void intel_pt_setup_period(struct intel_pt_decoder *decoder)
{
	if (decoder->period_type == INTEL_PT_PERIOD_TICKS) {
		uint64_t period;

		period = intel_pt_lower_power_of_2(decoder->period);
		decoder->period_mask  = ~(period - 1);
		decoder->period_ticks = period;
	}
}

static uint64_t multdiv(uint64_t t, uint32_t n, uint32_t d)
{
	if (!d)
		return 0;
	return (t / d) * n + ((t % d) * n) / d;
}

struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
{
	struct intel_pt_decoder *decoder;

	if (!params->get_trace || !params->walk_insn)
		return NULL;

	decoder = zalloc(sizeof(struct intel_pt_decoder));
	if (!decoder)
		return NULL;

	decoder->get_trace          = params->get_trace;
	decoder->walk_insn          = params->walk_insn;
	decoder->pgd_ip             = params->pgd_ip;
	decoder->lookahead          = params->lookahead;
	decoder->data               = params->data;
	decoder->return_compression = params->return_compression;
	decoder->branch_enable      = params->branch_enable;

	decoder->flags              = params->flags;

	decoder->period             = params->period;
	decoder->period_type        = params->period_type;

	decoder->max_non_turbo_ratio    = params->max_non_turbo_ratio;
	decoder->max_non_turbo_ratio_fp = params->max_non_turbo_ratio;

	intel_pt_setup_period(decoder);

	decoder->mtc_shift = params->mtc_period;
	decoder->ctc_rem_mask = (1 << decoder->mtc_shift) - 1;

	decoder->tsc_ctc_ratio_n = params->tsc_ctc_ratio_n;
	decoder->tsc_ctc_ratio_d = params->tsc_ctc_ratio_d;

	if (!decoder->tsc_ctc_ratio_n)
		decoder->tsc_ctc_ratio_d = 0;

	if (decoder->tsc_ctc_ratio_d) {
		if (!(decoder->tsc_ctc_ratio_n % decoder->tsc_ctc_ratio_d))
			decoder->tsc_ctc_mult = decoder->tsc_ctc_ratio_n /
						decoder->tsc_ctc_ratio_d;
	}

	/*
	 * A TSC packet can slip past MTC packets so that the timestamp appears
	 * to go backwards. One estimate is that can be up to about 40 CPU
	 * cycles, which is certainly less than 0x1000 TSC ticks, but accept
	 * slippage an order of magnitude more to be on the safe side.
	 */
	decoder->tsc_slip = 0x10000;

	intel_pt_log("timestamp: mtc_shift %u\n", decoder->mtc_shift);
	intel_pt_log("timestamp: tsc_ctc_ratio_n %u\n", decoder->tsc_ctc_ratio_n);
	intel_pt_log("timestamp: tsc_ctc_ratio_d %u\n", decoder->tsc_ctc_ratio_d);
	intel_pt_log("timestamp: tsc_ctc_mult %u\n", decoder->tsc_ctc_mult);
	intel_pt_log("timestamp: tsc_slip %#x\n", decoder->tsc_slip);

	return decoder;
}

static void intel_pt_pop_blk(struct intel_pt_stack *stack)
{
	struct intel_pt_blk *blk = stack->blk;

	stack->blk = blk->prev;
	if (!stack->spare)
		stack->spare = blk;
	else
		free(blk);
}

static uint64_t intel_pt_pop(struct intel_pt_stack *stack)
{
	if (!stack->pos) {
		if (!stack->blk)
			return 0;
		intel_pt_pop_blk(stack);
		if (!stack->blk)
			return 0;
		stack->pos = INTEL_PT_BLK_SIZE;
	}
	return stack->blk->ip[--stack->pos];
}

static int intel_pt_alloc_blk(struct intel_pt_stack *stack)
{
	struct intel_pt_blk *blk;

	if (stack->spare) {
		blk = stack->spare;
		stack->spare = NULL;
	} else {
		blk = malloc(sizeof(struct intel_pt_blk));
		if (!blk)
			return -ENOMEM;
	}

	blk->prev = stack->blk;
	stack->blk = blk;
	stack->pos = 0;
	return 0;
}

static int intel_pt_push(struct intel_pt_stack *stack, uint64_t ip)
{
	int err;

	if (!stack->blk || stack->pos == INTEL_PT_BLK_SIZE) {
		err = intel_pt_alloc_blk(stack);
		if (err)
			return err;
	}

	stack->blk->ip[stack->pos++] = ip;
	return 0;
}

static void intel_pt_clear_stack(struct intel_pt_stack *stack)
{
	while (stack->blk)
		intel_pt_pop_blk(stack);
	stack->pos = 0;
}

static void intel_pt_free_stack(struct intel_pt_stack *stack)
{
	intel_pt_clear_stack(stack);
	zfree(&stack->blk);
	zfree(&stack->spare);
}

void intel_pt_decoder_free(struct intel_pt_decoder *decoder)
{
	intel_pt_free_stack(&decoder->stack);
	free(decoder);
}

static int intel_pt_ext_err(int code)
{
	switch (code) {
	case -ENOMEM:
		return INTEL_PT_ERR_NOMEM;
	case -ENOSYS:
		return INTEL_PT_ERR_INTERN;
	case -EBADMSG:
		return INTEL_PT_ERR_BADPKT;
	case -ENODATA:
		return INTEL_PT_ERR_NODATA;
	case -EILSEQ:
		return INTEL_PT_ERR_NOINSN;
	case -ENOENT:
		return INTEL_PT_ERR_MISMAT;
	case -EOVERFLOW:
		return INTEL_PT_ERR_OVR;
	case -ENOSPC:
		return INTEL_PT_ERR_LOST;
	case -ELOOP:
		return INTEL_PT_ERR_NELOOP;
	default:
		return INTEL_PT_ERR_UNK;
	}
}

static const char *intel_pt_err_msgs[] = {
	[INTEL_PT_ERR_NOMEM]  = "Memory allocation failed",
	[INTEL_PT_ERR_INTERN] = "Internal error",
	[INTEL_PT_ERR_BADPKT] = "Bad packet",
	[INTEL_PT_ERR_NODATA] = "No more data",
	[INTEL_PT_ERR_NOINSN] = "Failed to get instruction",
	[INTEL_PT_ERR_MISMAT] = "Trace doesn't match instruction",
	[INTEL_PT_ERR_OVR]    = "Overflow packet",
	[INTEL_PT_ERR_LOST]   = "Lost trace data",
	[INTEL_PT_ERR_UNK]    = "Unknown error!",
	[INTEL_PT_ERR_NELOOP] = "Never-ending loop",
};

int intel_pt__strerror(int code, char *buf, size_t buflen)
{
	if (code < 1 || code >= INTEL_PT_ERR_MAX)
		code = INTEL_PT_ERR_UNK;
	strlcpy(buf, intel_pt_err_msgs[code], buflen);
	return 0;
}

static uint64_t intel_pt_calc_ip(const struct intel_pt_pkt *packet,
				 uint64_t last_ip)
{
	uint64_t ip;

	switch (packet->count) {
	case 1:
		ip = (last_ip & (uint64_t)0xffffffffffff0000ULL) |
		     packet->payload;
		break;
	case 2:
		ip = (last_ip & (uint64_t)0xffffffff00000000ULL) |
		     packet->payload;
		break;
	case 3:
		ip = packet->payload;
		/* Sign-extend 6-byte ip */
		if (ip & (uint64_t)0x800000000000ULL)
			ip |= (uint64_t)0xffff000000000000ULL;
		break;
	case 4:
		ip = (last_ip & (uint64_t)0xffff000000000000ULL) |
		     packet->payload;
		break;
	case 6:
		ip = packet->payload;
		break;
	default:
		return 0;
	}

	return ip;
}

static inline void intel_pt_set_last_ip(struct intel_pt_decoder *decoder)
{
	decoder->last_ip = intel_pt_calc_ip(&decoder->packet, decoder->last_ip);
	decoder->have_last_ip = true;
}

static inline void intel_pt_set_ip(struct intel_pt_decoder *decoder)
{
	intel_pt_set_last_ip(decoder);
	decoder->ip = decoder->last_ip;
}

static void intel_pt_decoder_log_packet(struct intel_pt_decoder *decoder)
{
	intel_pt_log_packet(&decoder->packet, decoder->pkt_len, decoder->pos,
			    decoder->buf);
}

static int intel_pt_bug(struct intel_pt_decoder *decoder)
{
	intel_pt_log("ERROR: Internal error\n");
	decoder->pkt_state = INTEL_PT_STATE_NO_PSB;
	return -ENOSYS;
}

static inline void intel_pt_clear_tx_flags(struct intel_pt_decoder *decoder)
{
	decoder->tx_flags = 0;
}

static inline void intel_pt_update_in_tx(struct intel_pt_decoder *decoder)
{
	decoder->tx_flags = decoder->packet.payload & INTEL_PT_IN_TX;
}

static int intel_pt_bad_packet(struct intel_pt_decoder *decoder)
{
	intel_pt_clear_tx_flags(decoder);
	decoder->have_tma = false;
	decoder->pkt_len = 1;
	decoder->pkt_step = 1;
	intel_pt_decoder_log_packet(decoder);
	if (decoder->pkt_state != INTEL_PT_STATE_NO_PSB) {
		intel_pt_log("ERROR: Bad packet\n");
		decoder->pkt_state = INTEL_PT_STATE_ERR1;
	}
	return -EBADMSG;
}

static inline void intel_pt_update_sample_time(struct intel_pt_decoder *decoder)
{
	decoder->sample_timestamp = decoder->timestamp;
	decoder->sample_insn_cnt = decoder->timestamp_insn_cnt;
}

static void intel_pt_reposition(struct intel_pt_decoder *decoder)
{
	decoder->ip = 0;
	decoder->pkt_state = INTEL_PT_STATE_NO_PSB;
	decoder->timestamp = 0;
	decoder->have_tma = false;
}

static int intel_pt_get_data(struct intel_pt_decoder *decoder, bool reposition)
{
	struct intel_pt_buffer buffer = { .buf = 0, };
	int ret;

	decoder->pkt_step = 0;

	intel_pt_log("Getting more data\n");
	ret = decoder->get_trace(&buffer, decoder->data);
	if (ret)
		return ret;
	decoder->buf = buffer.buf;
	decoder->len = buffer.len;
	if (!decoder->len) {
		intel_pt_log("No more data\n");
		return -ENODATA;
	}
	decoder->buf_timestamp = buffer.ref_timestamp;
	if (!buffer.consecutive || reposition) {
		intel_pt_reposition(decoder);
		decoder->ref_timestamp = buffer.ref_timestamp;
		decoder->state.trace_nr = buffer.trace_nr;
		intel_pt_log("Reference timestamp 0x%" PRIx64 "\n",
			     decoder->ref_timestamp);
		return -ENOLINK;
	}

	return 0;
}

static int intel_pt_get_next_data(struct intel_pt_decoder *decoder,
				  bool reposition)
{
	if (!decoder->next_buf)
		return intel_pt_get_data(decoder, reposition);

	decoder->buf = decoder->next_buf;
	decoder->len = decoder->next_len;
	decoder->next_buf = 0;
	decoder->next_len = 0;
	return 0;
}

static int intel_pt_get_split_packet(struct intel_pt_decoder *decoder)
{
	unsigned char *buf = decoder->temp_buf;
	size_t old_len, len, n;
	int ret;

	old_len = decoder->len;
	len = decoder->len;
	memcpy(buf, decoder->buf, len);

	ret = intel_pt_get_data(decoder, false);
	if (ret) {
		decoder->pos += old_len;
		return ret < 0 ? ret : -EINVAL;
	}

	n = INTEL_PT_PKT_MAX_SZ - len;
	if (n > decoder->len)
		n = decoder->len;
	memcpy(buf + len, decoder->buf, n);
	len += n;

	decoder->prev_pkt_ctx = decoder->pkt_ctx;
	ret = intel_pt_get_packet(buf, len, &decoder->packet, &decoder->pkt_ctx);
	if (ret < (int)old_len) {
		decoder->next_buf = decoder->buf;
		decoder->next_len = decoder->len;
		decoder->buf = buf;
		decoder->len = old_len;
		return intel_pt_bad_packet(decoder);
	}

	decoder->next_buf = decoder->buf + (ret - old_len);
	decoder->next_len = decoder->len - (ret - old_len);

	decoder->buf = buf;
	decoder->len = ret;

	return ret;
}

struct intel_pt_pkt_info {
	struct intel_pt_decoder	  *decoder;
	struct intel_pt_pkt       packet;
	uint64_t                  pos;
	int                       pkt_len;
	int                       last_packet_type;
	void                      *data;
};

typedef int (*intel_pt_pkt_cb_t)(struct intel_pt_pkt_info *pkt_info);

/* Lookahead packets in current buffer */
static int intel_pt_pkt_lookahead(struct intel_pt_decoder *decoder,
				  intel_pt_pkt_cb_t cb, void *data)
{
	struct intel_pt_pkt_info pkt_info;
	const unsigned char *buf = decoder->buf;
	enum intel_pt_pkt_ctx pkt_ctx = decoder->pkt_ctx;
	size_t len = decoder->len;
	int ret;

	pkt_info.decoder          = decoder;
	pkt_info.pos              = decoder->pos;
	pkt_info.pkt_len          = decoder->pkt_step;
	pkt_info.last_packet_type = decoder->last_packet_type;
	pkt_info.data             = data;

	while (1) {
		do {
			pkt_info.pos += pkt_info.pkt_len;
			buf          += pkt_info.pkt_len;
			len          -= pkt_info.pkt_len;

			if (!len)
				return INTEL_PT_NEED_MORE_BYTES;

			ret = intel_pt_get_packet(buf, len, &pkt_info.packet,
						  &pkt_ctx);
			if (!ret)
				return INTEL_PT_NEED_MORE_BYTES;
			if (ret < 0)
				return ret;

			pkt_info.pkt_len = ret;
		} while (pkt_info.packet.type == INTEL_PT_PAD);

		ret = cb(&pkt_info);
		if (ret)
			return 0;

		pkt_info.last_packet_type = pkt_info.packet.type;
	}
}

struct intel_pt_calc_cyc_to_tsc_info {
	uint64_t        cycle_cnt;
	unsigned int    cbr;
	uint32_t        last_mtc;
	uint64_t        ctc_timestamp;
	uint64_t        ctc_delta;
	uint64_t        tsc_timestamp;
	uint64_t        timestamp;
	bool            have_tma;
	bool            fixup_last_mtc;
	bool            from_mtc;
	double          cbr_cyc_to_tsc;
};

/*
 * MTC provides a 8-bit slice of CTC but the TMA packet only provides the lower
 * 16 bits of CTC. If mtc_shift > 8 then some of the MTC bits are not in the CTC
 * provided by the TMA packet. Fix-up the last_mtc calculated from the TMA
 * packet by copying the missing bits from the current MTC assuming the least
 * difference between the two, and that the current MTC comes after last_mtc.
 */
static void intel_pt_fixup_last_mtc(uint32_t mtc, int mtc_shift,
				    uint32_t *last_mtc)
{
	uint32_t first_missing_bit = 1U << (16 - mtc_shift);
	uint32_t mask = ~(first_missing_bit - 1);

	*last_mtc |= mtc & mask;
	if (*last_mtc >= mtc) {
		*last_mtc -= first_missing_bit;
		*last_mtc &= 0xff;
	}
}

static int intel_pt_calc_cyc_cb(struct intel_pt_pkt_info *pkt_info)
{
	struct intel_pt_decoder *decoder = pkt_info->decoder;
	struct intel_pt_calc_cyc_to_tsc_info *data = pkt_info->data;
	uint64_t timestamp;
	double cyc_to_tsc;
	unsigned int cbr;
	uint32_t mtc, mtc_delta, ctc, fc, ctc_rem;

	switch (pkt_info->packet.type) {
	case INTEL_PT_TNT:
	case INTEL_PT_TIP_PGE:
	case INTEL_PT_TIP:
	case INTEL_PT_FUP:
	case INTEL_PT_PSB:
	case INTEL_PT_PIP:
	case INTEL_PT_MODE_EXEC:
	case INTEL_PT_MODE_TSX:
	case INTEL_PT_PSBEND:
	case INTEL_PT_PAD:
	case INTEL_PT_VMCS:
	case INTEL_PT_MNT:
	case INTEL_PT_PTWRITE:
	case INTEL_PT_PTWRITE_IP:
	case INTEL_PT_BBP:
	case INTEL_PT_BIP:
	case INTEL_PT_BEP:
	case INTEL_PT_BEP_IP:
		return 0;

	case INTEL_PT_MTC:
		if (!data->have_tma)
			return 0;

		mtc = pkt_info->packet.payload;
		if (decoder->mtc_shift > 8 && data->fixup_last_mtc) {
			data->fixup_last_mtc = false;
			intel_pt_fixup_last_mtc(mtc, decoder->mtc_shift,
						&data->last_mtc);
		}
		if (mtc > data->last_mtc)
			mtc_delta = mtc - data->last_mtc;
		else
			mtc_delta = mtc + 256 - data->last_mtc;
		data->ctc_delta += mtc_delta << decoder->mtc_shift;
		data->last_mtc = mtc;

		if (decoder->tsc_ctc_mult) {
			timestamp = data->ctc_timestamp +
				data->ctc_delta * decoder->tsc_ctc_mult;
		} else {
			timestamp = data->ctc_timestamp +
				multdiv(data->ctc_delta,
					decoder->tsc_ctc_ratio_n,
					decoder->tsc_ctc_ratio_d);
		}

		if (timestamp < data->timestamp)
			return 1;

		if (pkt_info->last_packet_type != INTEL_PT_CYC) {
			data->timestamp = timestamp;
			return 0;
		}

		break;

	case INTEL_PT_TSC:
		/*
		 * For now, do not support using TSC packets - refer
		 * intel_pt_calc_cyc_to_tsc().
		 */
		if (data->from_mtc)
			return 1;
		timestamp = pkt_info->packet.payload |
			    (data->timestamp & (0xffULL << 56));
		if (data->from_mtc && timestamp < data->timestamp &&
		    data->timestamp - timestamp < decoder->tsc_slip)
			return 1;
		if (timestamp < data->timestamp)
			timestamp += (1ULL << 56);
		if (pkt_info->last_packet_type != INTEL_PT_CYC) {
			if (data->from_mtc)
				return 1;
			data->tsc_timestamp = timestamp;
			data->timestamp = timestamp;
			return 0;
		}
		break;

	case INTEL_PT_TMA:
		if (data->from_mtc)
			return 1;

		if (!decoder->tsc_ctc_ratio_d)
			return 0;

		ctc = pkt_info->packet.payload;
		fc = pkt_info->packet.count;
		ctc_rem = ctc & decoder->ctc_rem_mask;

		data->last_mtc = (ctc >> decoder->mtc_shift) & 0xff;

		data->ctc_timestamp = data->tsc_timestamp - fc;
		if (decoder->tsc_ctc_mult) {
			data->ctc_timestamp -= ctc_rem * decoder->tsc_ctc_mult;
		} else {
			data->ctc_timestamp -=
				multdiv(ctc_rem, decoder->tsc_ctc_ratio_n,
					decoder->tsc_ctc_ratio_d);
		}

		data->ctc_delta = 0;
		data->have_tma = true;
		data->fixup_last_mtc = true;

		return 0;

	case INTEL_PT_CYC:
		data->cycle_cnt += pkt_info->packet.payload;
		return 0;

	case INTEL_PT_CBR:
		cbr = pkt_info->packet.payload;
		if (data->cbr && data->cbr != cbr)
			return 1;
		data->cbr = cbr;
		data->cbr_cyc_to_tsc = decoder->max_non_turbo_ratio_fp / cbr;
		return 0;

	case INTEL_PT_TIP_PGD:
	case INTEL_PT_TRACESTOP:
	case INTEL_PT_EXSTOP:
	case INTEL_PT_EXSTOP_IP:
	case INTEL_PT_MWAIT:
	case INTEL_PT_PWRE:
	case INTEL_PT_PWRX:
	case INTEL_PT_OVF:
	case INTEL_PT_BAD: /* Does not happen */
	default:
		return 1;
	}

	if (!data->cbr && decoder->cbr) {
		data->cbr = decoder->cbr;
		data->cbr_cyc_to_tsc = decoder->cbr_cyc_to_tsc;
	}

	if (!data->cycle_cnt)
		return 1;

	cyc_to_tsc = (double)(timestamp - decoder->timestamp) / data->cycle_cnt;

	if (data->cbr && cyc_to_tsc > data->cbr_cyc_to_tsc &&
	    cyc_to_tsc / data->cbr_cyc_to_tsc > 1.25) {
		intel_pt_log("Timestamp: calculated %g TSC ticks per cycle too big (c.f. CBR-based value %g), pos " x64_fmt "\n",
			     cyc_to_tsc, data->cbr_cyc_to_tsc, pkt_info->pos);
		return 1;
	}

	decoder->calc_cyc_to_tsc = cyc_to_tsc;
	decoder->have_calc_cyc_to_tsc = true;

	if (data->cbr) {
		intel_pt_log("Timestamp: calculated %g TSC ticks per cycle c.f. CBR-based value %g, pos " x64_fmt "\n",
			     cyc_to_tsc, data->cbr_cyc_to_tsc, pkt_info->pos);
	} else {
		intel_pt_log("Timestamp: calculated %g TSC ticks per cycle c.f. unknown CBR-based value, pos " x64_fmt "\n",
			     cyc_to_tsc, pkt_info->pos);
	}

	return 1;
}

static void intel_pt_calc_cyc_to_tsc(struct intel_pt_decoder *decoder,
				     bool from_mtc)
{
	struct intel_pt_calc_cyc_to_tsc_info data = {
		.cycle_cnt      = 0,
		.cbr            = 0,
		.last_mtc       = decoder->last_mtc,
		.ctc_timestamp  = decoder->ctc_timestamp,
		.ctc_delta      = decoder->ctc_delta,
		.tsc_timestamp  = decoder->tsc_timestamp,
		.timestamp      = decoder->timestamp,
		.have_tma       = decoder->have_tma,
		.fixup_last_mtc = decoder->fixup_last_mtc,
		.from_mtc       = from_mtc,
		.cbr_cyc_to_tsc = 0,
	};

	/*
	 * For now, do not support using TSC packets for at least the reasons:
	 * 1) timing might have stopped
	 * 2) TSC packets within PSB+ can slip against CYC packets
	 */
	if (!from_mtc)
		return;

	intel_pt_pkt_lookahead(decoder, intel_pt_calc_cyc_cb, &data);
}

static int intel_pt_get_next_packet(struct intel_pt_decoder *decoder)
{
	int ret;

	decoder->last_packet_type = decoder->packet.type;

	do {
		decoder->pos += decoder->pkt_step;
		decoder->buf += decoder->pkt_step;
		decoder->len -= decoder->pkt_step;

		if (!decoder->len) {
			ret = intel_pt_get_next_data(decoder, false);
			if (ret)
				return ret;
		}

		decoder->prev_pkt_ctx = decoder->pkt_ctx;
		ret = intel_pt_get_packet(decoder->buf, decoder->len,
					  &decoder->packet, &decoder->pkt_ctx);
		if (ret == INTEL_PT_NEED_MORE_BYTES && BITS_PER_LONG == 32 &&
		    decoder->len < INTEL_PT_PKT_MAX_SZ && !decoder->next_buf) {
			ret = intel_pt_get_split_packet(decoder);
			if (ret < 0)
				return ret;
		}
		if (ret <= 0)
			return intel_pt_bad_packet(decoder);

		decoder->pkt_len = ret;
		decoder->pkt_step = ret;
		intel_pt_decoder_log_packet(decoder);
	} while (decoder->packet.type == INTEL_PT_PAD);

	return 0;
}

static uint64_t intel_pt_next_period(struct intel_pt_decoder *decoder)
{
	uint64_t timestamp, masked_timestamp;

	timestamp = decoder->timestamp + decoder->timestamp_insn_cnt;
	masked_timestamp = timestamp & decoder->period_mask;
	if (decoder->continuous_period) {
		if (masked_timestamp > decoder->last_masked_timestamp)
			return 1;
	} else {
		timestamp += 1;
		masked_timestamp = timestamp & decoder->period_mask;
		if (masked_timestamp > decoder->last_masked_timestamp) {
			decoder->last_masked_timestamp = masked_timestamp;
			decoder->continuous_period = true;
		}
	}

	if (masked_timestamp < decoder->last_masked_timestamp)
		return decoder->period_ticks;

	return decoder->period_ticks - (timestamp - masked_timestamp);
}

static uint64_t intel_pt_next_sample(struct intel_pt_decoder *decoder)
{
	switch (decoder->period_type) {
	case INTEL_PT_PERIOD_INSTRUCTIONS:
		return decoder->period - decoder->period_insn_cnt;
	case INTEL_PT_PERIOD_TICKS:
		return intel_pt_next_period(decoder);
	case INTEL_PT_PERIOD_NONE:
	case INTEL_PT_PERIOD_MTC:
	default:
		return 0;
	}
}

static void intel_pt_sample_insn(struct intel_pt_decoder *decoder)
{
	uint64_t timestamp, masked_timestamp;

	switch (decoder->period_type) {
	case INTEL_PT_PERIOD_INSTRUCTIONS:
		decoder->period_insn_cnt = 0;
		break;
	case INTEL_PT_PERIOD_TICKS:
		timestamp = decoder->timestamp + decoder->timestamp_insn_cnt;
		masked_timestamp = timestamp & decoder->period_mask;
		if (masked_timestamp > decoder->last_masked_timestamp)
			decoder->last_masked_timestamp = masked_timestamp;
		else
			decoder->last_masked_timestamp += decoder->period_ticks;
		break;
	case INTEL_PT_PERIOD_NONE:
	case INTEL_PT_PERIOD_MTC:
	default:
		break;
	}

	decoder->state.type |= INTEL_PT_INSTRUCTION;
}

static int intel_pt_walk_insn(struct intel_pt_decoder *decoder,
			      struct intel_pt_insn *intel_pt_insn, uint64_t ip)
{
	uint64_t max_insn_cnt, insn_cnt = 0;
	int err;

	if (!decoder->mtc_insn)
		decoder->mtc_insn = true;

	max_insn_cnt = intel_pt_next_sample(decoder);

	err = decoder->walk_insn(intel_pt_insn, &insn_cnt, &decoder->ip, ip,
				 max_insn_cnt, decoder->data);

	decoder->tot_insn_cnt += insn_cnt;
	decoder->timestamp_insn_cnt += insn_cnt;
	decoder->sample_insn_cnt += insn_cnt;
	decoder->period_insn_cnt += insn_cnt;

	if (err) {
		decoder->no_progress = 0;
		decoder->pkt_state = INTEL_PT_STATE_ERR2;
		intel_pt_log_at("ERROR: Failed to get instruction",
				decoder->ip);
		if (err == -ENOENT)
			return -ENOLINK;
		return -EILSEQ;
	}

	if (ip && decoder->ip == ip) {
		err = -EAGAIN;
		goto out;
	}

	if (max_insn_cnt && insn_cnt >= max_insn_cnt)
		intel_pt_sample_insn(decoder);

	if (intel_pt_insn->branch == INTEL_PT_BR_NO_BRANCH) {
		decoder->state.type = INTEL_PT_INSTRUCTION;
		decoder->state.from_ip = decoder->ip;
		decoder->state.to_ip = 0;
		decoder->ip += intel_pt_insn->length;
		err = INTEL_PT_RETURN;
		goto out;
	}

	if (intel_pt_insn->op == INTEL_PT_OP_CALL) {
		/* Zero-length calls are excluded */
		if (intel_pt_insn->branch != INTEL_PT_BR_UNCONDITIONAL ||
		    intel_pt_insn->rel) {
			err = intel_pt_push(&decoder->stack, decoder->ip +
					    intel_pt_insn->length);
			if (err)
				goto out;
		}
	} else if (intel_pt_insn->op == INTEL_PT_OP_RET) {
		decoder->ret_addr = intel_pt_pop(&decoder->stack);
	}

	if (intel_pt_insn->branch == INTEL_PT_BR_UNCONDITIONAL) {
		int cnt = decoder->no_progress++;

		decoder->state.from_ip = decoder->ip;
		decoder->ip += intel_pt_insn->length +
				intel_pt_insn->rel;
		decoder->state.to_ip = decoder->ip;
		err = INTEL_PT_RETURN;

		/*
		 * Check for being stuck in a loop.  This can happen if a
		 * decoder error results in the decoder erroneously setting the
		 * ip to an address that is itself in an infinite loop that
		 * consumes no packets.  When that happens, there must be an
		 * unconditional branch.
		 */
		if (cnt) {
			if (cnt == 1) {
				decoder->stuck_ip = decoder->state.to_ip;
				decoder->stuck_ip_prd = 1;
				decoder->stuck_ip_cnt = 1;
			} else if (cnt > INTEL_PT_MAX_LOOPS ||
				   decoder->state.to_ip == decoder->stuck_ip) {
				intel_pt_log_at("ERROR: Never-ending loop",
						decoder->state.to_ip);
				decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
				err = -ELOOP;
				goto out;
			} else if (!--decoder->stuck_ip_cnt) {
				decoder->stuck_ip_prd += 1;
				decoder->stuck_ip_cnt = decoder->stuck_ip_prd;
				decoder->stuck_ip = decoder->state.to_ip;
			}
		}
		goto out_no_progress;
	}
out:
	decoder->no_progress = 0;
out_no_progress:
	decoder->state.insn_op = intel_pt_insn->op;
	decoder->state.insn_len = intel_pt_insn->length;
	memcpy(decoder->state.insn, intel_pt_insn->buf,
	       INTEL_PT_INSN_BUF_SZ);

	if (decoder->tx_flags & INTEL_PT_IN_TX)
		decoder->state.flags |= INTEL_PT_IN_TX;

	return err;
}

static bool intel_pt_fup_event(struct intel_pt_decoder *decoder)
{
	bool ret = false;

	if (decoder->set_fup_tx_flags) {
		decoder->set_fup_tx_flags = false;
		decoder->tx_flags = decoder->fup_tx_flags;
		decoder->state.type = INTEL_PT_TRANSACTION;
		decoder->state.from_ip = decoder->ip;
		decoder->state.to_ip = 0;
		decoder->state.flags = decoder->fup_tx_flags;
		return true;
	}
	if (decoder->set_fup_ptw) {
		decoder->set_fup_ptw = false;
		decoder->state.type = INTEL_PT_PTW;
		decoder->state.flags |= INTEL_PT_FUP_IP;
		decoder->state.from_ip = decoder->ip;
		decoder->state.to_ip = 0;
		decoder->state.ptw_payload = decoder->fup_ptw_payload;
		return true;
	}
	if (decoder->set_fup_mwait) {
		decoder->set_fup_mwait = false;
		decoder->state.type = INTEL_PT_MWAIT_OP;
		decoder->state.from_ip = decoder->ip;
		decoder->state.to_ip = 0;
		decoder->state.mwait_payload = decoder->fup_mwait_payload;
		ret = true;
	}
	if (decoder->set_fup_pwre) {
		decoder->set_fup_pwre = false;
		decoder->state.type |= INTEL_PT_PWR_ENTRY;
		decoder->state.type &= ~INTEL_PT_BRANCH;
		decoder->state.from_ip = decoder->ip;
		decoder->state.to_ip = 0;
		decoder->state.pwre_payload = decoder->fup_pwre_payload;
		ret = true;
	}
	if (decoder->set_fup_exstop) {
		decoder->set_fup_exstop = false;
		decoder->state.type |= INTEL_PT_EX_STOP;
		decoder->state.type &= ~INTEL_PT_BRANCH;
		decoder->state.flags |= INTEL_PT_FUP_IP;
		decoder->state.from_ip = decoder->ip;
		decoder->state.to_ip = 0;
		ret = true;
	}
	if (decoder->set_fup_bep) {
		decoder->set_fup_bep = false;
		decoder->state.type |= INTEL_PT_BLK_ITEMS;
		decoder->state.type &= ~INTEL_PT_BRANCH;
		decoder->state.from_ip = decoder->ip;
		decoder->state.to_ip = 0;
		ret = true;
	}
	return ret;
}

static inline bool intel_pt_fup_with_nlip(struct intel_pt_decoder *decoder,
					  struct intel_pt_insn *intel_pt_insn,
					  uint64_t ip, int err)
{
	return decoder->flags & INTEL_PT_FUP_WITH_NLIP && !err &&
	       intel_pt_insn->branch == INTEL_PT_BR_INDIRECT &&
	       ip == decoder->ip + intel_pt_insn->length;
}

static int intel_pt_walk_fup(struct intel_pt_decoder *decoder)
{
	struct intel_pt_insn intel_pt_insn;
	uint64_t ip;
	int err;

	ip = decoder->last_ip;

	while (1) {
		err = intel_pt_walk_insn(decoder, &intel_pt_insn, ip);
		if (err == INTEL_PT_RETURN)
			return 0;
		if (err == -EAGAIN ||
		    intel_pt_fup_with_nlip(decoder, &intel_pt_insn, ip, err)) {
			if (intel_pt_fup_event(decoder))
				return 0;
			return -EAGAIN;
		}
		decoder->set_fup_tx_flags = false;
		if (err)
			return err;

		if (intel_pt_insn.branch == INTEL_PT_BR_INDIRECT) {
			intel_pt_log_at("ERROR: Unexpected indirect branch",
					decoder->ip);
			decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
			return -ENOENT;
		}

		if (intel_pt_insn.branch == INTEL_PT_BR_CONDITIONAL) {
			intel_pt_log_at("ERROR: Unexpected conditional branch",
					decoder->ip);
			decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
			return -ENOENT;
		}

		intel_pt_bug(decoder);
	}
}

static int intel_pt_walk_tip(struct intel_pt_decoder *decoder)
{
	struct intel_pt_insn intel_pt_insn;
	int err;

	err = intel_pt_walk_insn(decoder, &intel_pt_insn, 0);
	if (err == INTEL_PT_RETURN &&
	    decoder->pgd_ip &&
	    decoder->pkt_state == INTEL_PT_STATE_TIP_PGD &&
	    (decoder->state.type & INTEL_PT_BRANCH) &&
	    decoder->pgd_ip(decoder->state.to_ip, decoder->data)) {
		/* Unconditional branch leaving filter region */
		decoder->no_progress = 0;
		decoder->pge = false;
		decoder->continuous_period = false;
		decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
		decoder->state.type |= INTEL_PT_TRACE_END;
		return 0;
	}
	if (err == INTEL_PT_RETURN)
		return 0;
	if (err)
		return err;

	if (intel_pt_insn.branch == INTEL_PT_BR_INDIRECT) {
		if (decoder->pkt_state == INTEL_PT_STATE_TIP_PGD) {
			decoder->pge = false;
			decoder->continuous_period = false;
			decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
			decoder->state.from_ip = decoder->ip;
			if (decoder->packet.count == 0) {
				decoder->state.to_ip = 0;
			} else {
				decoder->state.to_ip = decoder->last_ip;
				decoder->ip = decoder->last_ip;
			}
			decoder->state.type |= INTEL_PT_TRACE_END;
		} else {
			decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
			decoder->state.from_ip = decoder->ip;
			if (decoder->packet.count == 0) {
				decoder->state.to_ip = 0;
			} else {
				decoder->state.to_ip = decoder->last_ip;
				decoder->ip = decoder->last_ip;
			}
		}
		return 0;
	}

	if (intel_pt_insn.branch == INTEL_PT_BR_CONDITIONAL) {
		uint64_t to_ip = decoder->ip + intel_pt_insn.length +
				 intel_pt_insn.rel;

		if (decoder->pgd_ip &&
		    decoder->pkt_state == INTEL_PT_STATE_TIP_PGD &&
		    decoder->pgd_ip(to_ip, decoder->data)) {
			/* Conditional branch leaving filter region */
			decoder->pge = false;
			decoder->continuous_period = false;
			decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
			decoder->ip = to_ip;
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = to_ip;
			decoder->state.type |= INTEL_PT_TRACE_END;
			return 0;
		}
		intel_pt_log_at("ERROR: Conditional branch when expecting indirect branch",
				decoder->ip);
		decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
		return -ENOENT;
	}

	return intel_pt_bug(decoder);
}

static int intel_pt_walk_tnt(struct intel_pt_decoder *decoder)
{
	struct intel_pt_insn intel_pt_insn;
	int err;

	while (1) {
		err = intel_pt_walk_insn(decoder, &intel_pt_insn, 0);
		if (err == INTEL_PT_RETURN)
			return 0;
		if (err)
			return err;

		if (intel_pt_insn.op == INTEL_PT_OP_RET) {
			if (!decoder->return_compression) {
				intel_pt_log_at("ERROR: RET when expecting conditional branch",
						decoder->ip);
				decoder->pkt_state = INTEL_PT_STATE_ERR3;
				return -ENOENT;
			}
			if (!decoder->ret_addr) {
				intel_pt_log_at("ERROR: Bad RET compression (stack empty)",
						decoder->ip);
				decoder->pkt_state = INTEL_PT_STATE_ERR3;
				return -ENOENT;
			}
			if (!(decoder->tnt.payload & BIT63)) {
				intel_pt_log_at("ERROR: Bad RET compression (TNT=N)",
						decoder->ip);
				decoder->pkt_state = INTEL_PT_STATE_ERR3;
				return -ENOENT;
			}
			decoder->tnt.count -= 1;
			if (decoder->tnt.count)
				decoder->pkt_state = INTEL_PT_STATE_TNT_CONT;
			else
				decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
			decoder->tnt.payload <<= 1;
			decoder->state.from_ip = decoder->ip;
			decoder->ip = decoder->ret_addr;
			decoder->state.to_ip = decoder->ip;
			return 0;
		}

		if (intel_pt_insn.branch == INTEL_PT_BR_INDIRECT) {
			/* Handle deferred TIPs */
			err = intel_pt_get_next_packet(decoder);
			if (err)
				return err;
			if (decoder->packet.type != INTEL_PT_TIP ||
			    decoder->packet.count == 0) {
				intel_pt_log_at("ERROR: Missing deferred TIP for indirect branch",
						decoder->ip);
				decoder->pkt_state = INTEL_PT_STATE_ERR3;
				decoder->pkt_step = 0;
				return -ENOENT;
			}
			intel_pt_set_last_ip(decoder);
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = decoder->last_ip;
			decoder->ip = decoder->last_ip;
			return 0;
		}

		if (intel_pt_insn.branch == INTEL_PT_BR_CONDITIONAL) {
			decoder->tnt.count -= 1;
			if (decoder->tnt.count)
				decoder->pkt_state = INTEL_PT_STATE_TNT_CONT;
			else
				decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
			if (decoder->tnt.payload & BIT63) {
				decoder->tnt.payload <<= 1;
				decoder->state.from_ip = decoder->ip;
				decoder->ip += intel_pt_insn.length +
					       intel_pt_insn.rel;
				decoder->state.to_ip = decoder->ip;
				return 0;
			}
			/* Instruction sample for a non-taken branch */
			if (decoder->state.type & INTEL_PT_INSTRUCTION) {
				decoder->tnt.payload <<= 1;
				decoder->state.type = INTEL_PT_INSTRUCTION;
				decoder->state.from_ip = decoder->ip;
				decoder->state.to_ip = 0;
				decoder->ip += intel_pt_insn.length;
				return 0;
			}
			decoder->sample_cyc = false;
			decoder->ip += intel_pt_insn.length;
			if (!decoder->tnt.count) {
				intel_pt_update_sample_time(decoder);
				return -EAGAIN;
			}
			decoder->tnt.payload <<= 1;
			continue;
		}

		return intel_pt_bug(decoder);
	}
}

static int intel_pt_mode_tsx(struct intel_pt_decoder *decoder, bool *no_tip)
{
	unsigned int fup_tx_flags;
	int err;

	fup_tx_flags = decoder->packet.payload &
		       (INTEL_PT_IN_TX | INTEL_PT_ABORT_TX);
	err = intel_pt_get_next_packet(decoder);
	if (err)
		return err;
	if (decoder->packet.type == INTEL_PT_FUP) {
		decoder->fup_tx_flags = fup_tx_flags;
		decoder->set_fup_tx_flags = true;
		if (!(decoder->fup_tx_flags & INTEL_PT_ABORT_TX))
			*no_tip = true;
	} else {
		intel_pt_log_at("ERROR: Missing FUP after MODE.TSX",
				decoder->pos);
		intel_pt_update_in_tx(decoder);
	}
	return 0;
}

static uint64_t intel_pt_8b_tsc(uint64_t timestamp, uint64_t ref_timestamp)
{
	timestamp |= (ref_timestamp & (0xffULL << 56));

	if (timestamp < ref_timestamp) {
		if (ref_timestamp - timestamp > (1ULL << 55))
			timestamp += (1ULL << 56);
	} else {
		if (timestamp - ref_timestamp > (1ULL << 55))
			timestamp -= (1ULL << 56);
	}

	return timestamp;
}

static void intel_pt_calc_tsc_timestamp(struct intel_pt_decoder *decoder)
{
	uint64_t timestamp;

	decoder->have_tma = false;

	if (decoder->ref_timestamp) {
		timestamp = intel_pt_8b_tsc(decoder->packet.payload,
					    decoder->ref_timestamp);
		decoder->tsc_timestamp = timestamp;
		decoder->timestamp = timestamp;
		decoder->ref_timestamp = 0;
		decoder->timestamp_insn_cnt = 0;
	} else if (decoder->timestamp) {
		timestamp = decoder->packet.payload |
			    (decoder->timestamp & (0xffULL << 56));
		decoder->tsc_timestamp = timestamp;
		if (timestamp < decoder->timestamp &&
		    decoder->timestamp - timestamp < decoder->tsc_slip) {
			intel_pt_log_to("Suppressing backwards timestamp",
					timestamp);
			timestamp = decoder->timestamp;
		}
		if (timestamp < decoder->timestamp) {
			intel_pt_log_to("Wraparound timestamp", timestamp);
			timestamp += (1ULL << 56);
			decoder->tsc_timestamp = timestamp;
		}
		decoder->timestamp = timestamp;
		decoder->timestamp_insn_cnt = 0;
	}

	if (decoder->last_packet_type == INTEL_PT_CYC) {
		decoder->cyc_ref_timestamp = decoder->timestamp;
		decoder->cycle_cnt = 0;
		decoder->have_calc_cyc_to_tsc = false;
		intel_pt_calc_cyc_to_tsc(decoder, false);
	}

	intel_pt_log_to("Setting timestamp", decoder->timestamp);
}

static int intel_pt_overflow(struct intel_pt_decoder *decoder)
{
	intel_pt_log("ERROR: Buffer overflow\n");
	intel_pt_clear_tx_flags(decoder);
	decoder->timestamp_insn_cnt = 0;
	decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
	decoder->overflow = true;
	return -EOVERFLOW;
}

static inline void intel_pt_mtc_cyc_cnt_pge(struct intel_pt_decoder *decoder)
{
	if (decoder->have_cyc)
		return;

	decoder->cyc_cnt_timestamp = decoder->timestamp;
	decoder->base_cyc_cnt = decoder->tot_cyc_cnt;
}

static inline void intel_pt_mtc_cyc_cnt_cbr(struct intel_pt_decoder *decoder)
{
	decoder->tsc_to_cyc = decoder->cbr / decoder->max_non_turbo_ratio_fp;

	if (decoder->pge)
		intel_pt_mtc_cyc_cnt_pge(decoder);
}

static inline void intel_pt_mtc_cyc_cnt_upd(struct intel_pt_decoder *decoder)
{
	uint64_t tot_cyc_cnt, tsc_delta;

	if (decoder->have_cyc)
		return;

	decoder->sample_cyc = true;

	if (!decoder->pge || decoder->timestamp <= decoder->cyc_cnt_timestamp)
		return;

	tsc_delta = decoder->timestamp - decoder->cyc_cnt_timestamp;
	tot_cyc_cnt = tsc_delta * decoder->tsc_to_cyc + decoder->base_cyc_cnt;

	if (tot_cyc_cnt > decoder->tot_cyc_cnt)
		decoder->tot_cyc_cnt = tot_cyc_cnt;
}

static void intel_pt_calc_tma(struct intel_pt_decoder *decoder)
{
	uint32_t ctc = decoder->packet.payload;
	uint32_t fc = decoder->packet.count;
	uint32_t ctc_rem = ctc & decoder->ctc_rem_mask;

	if (!decoder->tsc_ctc_ratio_d)
		return;

	if (decoder->pge && !decoder->in_psb)
		intel_pt_mtc_cyc_cnt_pge(decoder);
	else
		intel_pt_mtc_cyc_cnt_upd(decoder);

	decoder->last_mtc = (ctc >> decoder->mtc_shift) & 0xff;
	decoder->ctc_timestamp = decoder->tsc_timestamp - fc;
	if (decoder->tsc_ctc_mult) {
		decoder->ctc_timestamp -= ctc_rem * decoder->tsc_ctc_mult;
	} else {
		decoder->ctc_timestamp -= multdiv(ctc_rem,
						  decoder->tsc_ctc_ratio_n,
						  decoder->tsc_ctc_ratio_d);
	}
	decoder->ctc_delta = 0;
	decoder->have_tma = true;
	decoder->fixup_last_mtc = true;
	intel_pt_log("CTC timestamp " x64_fmt " last MTC %#x  CTC rem %#x\n",
		     decoder->ctc_timestamp, decoder->last_mtc, ctc_rem);
}

static void intel_pt_calc_mtc_timestamp(struct intel_pt_decoder *decoder)
{
	uint64_t timestamp;
	uint32_t mtc, mtc_delta;

	if (!decoder->have_tma)
		return;

	mtc = decoder->packet.payload;

	if (decoder->mtc_shift > 8 && decoder->fixup_last_mtc) {
		decoder->fixup_last_mtc = false;
		intel_pt_fixup_last_mtc(mtc, decoder->mtc_shift,
					&decoder->last_mtc);
	}

	if (mtc > decoder->last_mtc)
		mtc_delta = mtc - decoder->last_mtc;
	else
		mtc_delta = mtc + 256 - decoder->last_mtc;

	decoder->ctc_delta += mtc_delta << decoder->mtc_shift;

	if (decoder->tsc_ctc_mult) {
		timestamp = decoder->ctc_timestamp +
			    decoder->ctc_delta * decoder->tsc_ctc_mult;
	} else {
		timestamp = decoder->ctc_timestamp +
			    multdiv(decoder->ctc_delta,
				    decoder->tsc_ctc_ratio_n,
				    decoder->tsc_ctc_ratio_d);
	}

	if (timestamp < decoder->timestamp)
		intel_pt_log("Suppressing MTC timestamp " x64_fmt " less than current timestamp " x64_fmt "\n",
			     timestamp, decoder->timestamp);
	else
		decoder->timestamp = timestamp;

	intel_pt_mtc_cyc_cnt_upd(decoder);

	decoder->timestamp_insn_cnt = 0;
	decoder->last_mtc = mtc;

	if (decoder->last_packet_type == INTEL_PT_CYC) {
		decoder->cyc_ref_timestamp = decoder->timestamp;
		decoder->cycle_cnt = 0;
		decoder->have_calc_cyc_to_tsc = false;
		intel_pt_calc_cyc_to_tsc(decoder, true);
	}

	intel_pt_log_to("Setting timestamp", decoder->timestamp);
}

static void intel_pt_calc_cbr(struct intel_pt_decoder *decoder)
{
	unsigned int cbr = decoder->packet.payload & 0xff;

	decoder->cbr_payload = decoder->packet.payload;

	if (decoder->cbr == cbr)
		return;

	decoder->cbr = cbr;
	decoder->cbr_cyc_to_tsc = decoder->max_non_turbo_ratio_fp / cbr;

	intel_pt_mtc_cyc_cnt_cbr(decoder);
}

static void intel_pt_calc_cyc_timestamp(struct intel_pt_decoder *decoder)
{
	uint64_t timestamp = decoder->cyc_ref_timestamp;

	decoder->have_cyc = true;

	decoder->cycle_cnt += decoder->packet.payload;
	if (decoder->pge)
		decoder->tot_cyc_cnt += decoder->packet.payload;
	decoder->sample_cyc = true;

	if (!decoder->cyc_ref_timestamp)
		return;

	if (decoder->have_calc_cyc_to_tsc)
		timestamp += decoder->cycle_cnt * decoder->calc_cyc_to_tsc;
	else if (decoder->cbr)
		timestamp += decoder->cycle_cnt * decoder->cbr_cyc_to_tsc;
	else
		return;

	if (timestamp < decoder->timestamp)
		intel_pt_log("Suppressing CYC timestamp " x64_fmt " less than current timestamp " x64_fmt "\n",
			     timestamp, decoder->timestamp);
	else
		decoder->timestamp = timestamp;

	decoder->timestamp_insn_cnt = 0;

	intel_pt_log_to("Setting timestamp", decoder->timestamp);
}

static void intel_pt_bbp(struct intel_pt_decoder *decoder)
{
	if (decoder->prev_pkt_ctx == INTEL_PT_NO_CTX) {
		memset(decoder->state.items.mask, 0, sizeof(decoder->state.items.mask));
		decoder->state.items.is_32_bit = false;
	}
	decoder->blk_type = decoder->packet.payload;
	decoder->blk_type_pos = intel_pt_blk_type_pos(decoder->blk_type);
	if (decoder->blk_type == INTEL_PT_GP_REGS)
		decoder->state.items.is_32_bit = decoder->packet.count;
	if (decoder->blk_type_pos < 0) {
		intel_pt_log("WARNING: Unknown block type %u\n",
			     decoder->blk_type);
	} else if (decoder->state.items.mask[decoder->blk_type_pos]) {
		intel_pt_log("WARNING: Duplicate block type %u\n",
			     decoder->blk_type);
	}
}

static void intel_pt_bip(struct intel_pt_decoder *decoder)
{
	uint32_t id = decoder->packet.count;
	uint32_t bit = 1 << id;
	int pos = decoder->blk_type_pos;

	if (pos < 0 || id >= INTEL_PT_BLK_ITEM_ID_CNT) {
		intel_pt_log("WARNING: Unknown block item %u type %d\n",
			     id, decoder->blk_type);
		return;
	}

	if (decoder->state.items.mask[pos] & bit) {
		intel_pt_log("WARNING: Duplicate block item %u type %d\n",
			     id, decoder->blk_type);
	}

	decoder->state.items.mask[pos] |= bit;
	decoder->state.items.val[pos][id] = decoder->packet.payload;
}

/* Walk PSB+ packets when already in sync. */
static int intel_pt_walk_psbend(struct intel_pt_decoder *decoder)
{
	int err;

	decoder->in_psb = true;

	while (1) {
		err = intel_pt_get_next_packet(decoder);
		if (err)
			goto out;

		switch (decoder->packet.type) {
		case INTEL_PT_PSBEND:
			err = 0;
			goto out;

		case INTEL_PT_TIP_PGD:
		case INTEL_PT_TIP_PGE:
		case INTEL_PT_TIP:
		case INTEL_PT_TNT:
		case INTEL_PT_TRACESTOP:
		case INTEL_PT_BAD:
		case INTEL_PT_PSB:
		case INTEL_PT_PTWRITE:
		case INTEL_PT_PTWRITE_IP:
		case INTEL_PT_EXSTOP:
		case INTEL_PT_EXSTOP_IP:
		case INTEL_PT_MWAIT:
		case INTEL_PT_PWRE:
		case INTEL_PT_PWRX:
		case INTEL_PT_BBP:
		case INTEL_PT_BIP:
		case INTEL_PT_BEP:
		case INTEL_PT_BEP_IP:
			decoder->have_tma = false;
			intel_pt_log("ERROR: Unexpected packet\n");
			err = -EAGAIN;
			goto out;

		case INTEL_PT_OVF:
			err = intel_pt_overflow(decoder);
			goto out;

		case INTEL_PT_TSC:
			intel_pt_calc_tsc_timestamp(decoder);
			break;

		case INTEL_PT_TMA:
			intel_pt_calc_tma(decoder);
			break;

		case INTEL_PT_CBR:
			intel_pt_calc_cbr(decoder);
			break;

		case INTEL_PT_MODE_EXEC:
			decoder->exec_mode = decoder->packet.payload;
			break;

		case INTEL_PT_PIP:
			decoder->cr3 = decoder->packet.payload & (BIT63 - 1);
			break;

		case INTEL_PT_FUP:
			decoder->pge = true;
			if (decoder->packet.count)
				intel_pt_set_last_ip(decoder);
			break;

		case INTEL_PT_MODE_TSX:
			intel_pt_update_in_tx(decoder);
			break;

		case INTEL_PT_MTC:
			intel_pt_calc_mtc_timestamp(decoder);
			if (decoder->period_type == INTEL_PT_PERIOD_MTC)
				decoder->state.type |= INTEL_PT_INSTRUCTION;
			break;

		case INTEL_PT_CYC:
		case INTEL_PT_VMCS:
		case INTEL_PT_MNT:
		case INTEL_PT_PAD:
		default:
			break;
		}
	}
out:
	decoder->in_psb = false;

	return err;
}

static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
{
	int err;

	if (decoder->tx_flags & INTEL_PT_ABORT_TX) {
		decoder->tx_flags = 0;
		decoder->state.flags &= ~INTEL_PT_IN_TX;
		decoder->state.flags |= INTEL_PT_ABORT_TX;
	} else {
		decoder->state.flags |= INTEL_PT_ASYNC;
	}

	while (1) {
		err = intel_pt_get_next_packet(decoder);
		if (err)
			return err;

		switch (decoder->packet.type) {
		case INTEL_PT_TNT:
		case INTEL_PT_FUP:
		case INTEL_PT_TRACESTOP:
		case INTEL_PT_PSB:
		case INTEL_PT_TSC:
		case INTEL_PT_TMA:
		case INTEL_PT_MODE_TSX:
		case INTEL_PT_BAD:
		case INTEL_PT_PSBEND:
		case INTEL_PT_PTWRITE:
		case INTEL_PT_PTWRITE_IP:
		case INTEL_PT_EXSTOP:
		case INTEL_PT_EXSTOP_IP:
		case INTEL_PT_MWAIT:
		case INTEL_PT_PWRE:
		case INTEL_PT_PWRX:
		case INTEL_PT_BBP:
		case INTEL_PT_BIP:
		case INTEL_PT_BEP:
		case INTEL_PT_BEP_IP:
			intel_pt_log("ERROR: Missing TIP after FUP\n");
			decoder->pkt_state = INTEL_PT_STATE_ERR3;
			decoder->pkt_step = 0;
			return -ENOENT;

		case INTEL_PT_CBR:
			intel_pt_calc_cbr(decoder);
			break;

		case INTEL_PT_OVF:
			return intel_pt_overflow(decoder);

		case INTEL_PT_TIP_PGD:
			decoder->state.from_ip = decoder->ip;
			if (decoder->packet.count == 0) {
				decoder->state.to_ip = 0;
			} else {
				intel_pt_set_ip(decoder);
				decoder->state.to_ip = decoder->ip;
			}
			decoder->pge = false;
			decoder->continuous_period = false;
			decoder->state.type |= INTEL_PT_TRACE_END;
			return 0;

		case INTEL_PT_TIP_PGE:
			decoder->pge = true;
			intel_pt_log("Omitting PGE ip " x64_fmt "\n",
				     decoder->ip);
			decoder->state.from_ip = 0;
			if (decoder->packet.count == 0) {
				decoder->state.to_ip = 0;
			} else {
				intel_pt_set_ip(decoder);
				decoder->state.to_ip = decoder->ip;
			}
			decoder->state.type |= INTEL_PT_TRACE_BEGIN;
			intel_pt_mtc_cyc_cnt_pge(decoder);
			return 0;

		case INTEL_PT_TIP:
			decoder->state.from_ip = decoder->ip;
			if (decoder->packet.count == 0) {
				decoder->state.to_ip = 0;
			} else {
				intel_pt_set_ip(decoder);
				decoder->state.to_ip = decoder->ip;
			}
			return 0;

		case INTEL_PT_PIP:
			decoder->cr3 = decoder->packet.payload & (BIT63 - 1);
			break;

		case INTEL_PT_MTC:
			intel_pt_calc_mtc_timestamp(decoder);
			if (decoder->period_type == INTEL_PT_PERIOD_MTC)
				decoder->state.type |= INTEL_PT_INSTRUCTION;
			break;

		case INTEL_PT_CYC:
			intel_pt_calc_cyc_timestamp(decoder);
			break;

		case INTEL_PT_MODE_EXEC:
			decoder->exec_mode = decoder->packet.payload;
			break;

		case INTEL_PT_VMCS:
		case INTEL_PT_MNT:
		case INTEL_PT_PAD:
			break;

		default:
			return intel_pt_bug(decoder);
		}
	}
}

static int intel_pt_walk_trace(struct intel_pt_decoder *decoder)
{
	bool no_tip = false;
	int err;

	while (1) {
		err = intel_pt_get_next_packet(decoder);
		if (err)
			return err;
next:
		switch (decoder->packet.type) {
		case INTEL_PT_TNT:
			if (!decoder->packet.count)
				break;
			decoder->tnt = decoder->packet;
			decoder->pkt_state = INTEL_PT_STATE_TNT;
			err = intel_pt_walk_tnt(decoder);
			if (err == -EAGAIN)
				break;
			return err;

		case INTEL_PT_TIP_PGD:
			if (decoder->packet.count != 0)
				intel_pt_set_last_ip(decoder);
			decoder->pkt_state = INTEL_PT_STATE_TIP_PGD;
			return intel_pt_walk_tip(decoder);

		case INTEL_PT_TIP_PGE: {
			decoder->pge = true;
			intel_pt_mtc_cyc_cnt_pge(decoder);
			if (decoder->packet.count == 0) {
				intel_pt_log_at("Skipping zero TIP.PGE",
						decoder->pos);
				break;
			}
			intel_pt_set_ip(decoder);
			decoder->state.from_ip = 0;
			decoder->state.to_ip = decoder->ip;
			decoder->state.type |= INTEL_PT_TRACE_BEGIN;
			return 0;
		}

		case INTEL_PT_OVF:
			return intel_pt_overflow(decoder);

		case INTEL_PT_TIP:
			if (decoder->packet.count != 0)
				intel_pt_set_last_ip(decoder);
			decoder->pkt_state = INTEL_PT_STATE_TIP;
			return intel_pt_walk_tip(decoder);

		case INTEL_PT_FUP:
			if (decoder->packet.count == 0) {
				intel_pt_log_at("Skipping zero FUP",
						decoder->pos);
				no_tip = false;
				break;
			}
			intel_pt_set_last_ip(decoder);
			if (!decoder->branch_enable) {
				decoder->ip = decoder->last_ip;
				if (intel_pt_fup_event(decoder))
					return 0;
				no_tip = false;
				break;
			}
			if (decoder->set_fup_mwait)
				no_tip = true;
			err = intel_pt_walk_fup(decoder);
			if (err != -EAGAIN) {
				if (err)
					return err;
				if (no_tip)
					decoder->pkt_state =
						INTEL_PT_STATE_FUP_NO_TIP;
				else
					decoder->pkt_state = INTEL_PT_STATE_FUP;
				return 0;
			}
			if (no_tip) {
				no_tip = false;
				break;
			}
			return intel_pt_walk_fup_tip(decoder);

		case INTEL_PT_TRACESTOP:
			decoder->pge = false;
			decoder->continuous_period = false;
			intel_pt_clear_tx_flags(decoder);
			decoder->have_tma = false;
			break;

		case INTEL_PT_PSB:
			decoder->last_ip = 0;
			decoder->have_last_ip = true;
			intel_pt_clear_stack(&decoder->stack);
			err = intel_pt_walk_psbend(decoder);
			if (err == -EAGAIN)
				goto next;
			if (err)
				return err;
			/*
			 * PSB+ CBR will not have changed but cater for the
			 * possibility of another CBR change that gets caught up
			 * in the PSB+.
			 */
			if (decoder->cbr != decoder->cbr_seen)
				return 0;
			break;

		case INTEL_PT_PIP:
			decoder->cr3 = decoder->packet.payload & (BIT63 - 1);
			break;

		case INTEL_PT_MTC:
			intel_pt_calc_mtc_timestamp(decoder);
			if (decoder->period_type != INTEL_PT_PERIOD_MTC)
				break;
			/*
			 * Ensure that there has been an instruction since the
			 * last MTC.
			 */
			if (!decoder->mtc_insn)
				break;
			decoder->mtc_insn = false;
			/* Ensure that there is a timestamp */
			if (!decoder->timestamp)
				break;
			decoder->state.type = INTEL_PT_INSTRUCTION;
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = 0;
			decoder->mtc_insn = false;
			return 0;

		case INTEL_PT_TSC:
			intel_pt_calc_tsc_timestamp(decoder);
			break;

		case INTEL_PT_TMA:
			intel_pt_calc_tma(decoder);
			break;

		case INTEL_PT_CYC:
			intel_pt_calc_cyc_timestamp(decoder);
			break;

		case INTEL_PT_CBR:
			intel_pt_calc_cbr(decoder);
			if (decoder->cbr != decoder->cbr_seen)
				return 0;
			break;

		case INTEL_PT_MODE_EXEC:
			decoder->exec_mode = decoder->packet.payload;
			break;

		case INTEL_PT_MODE_TSX:
			/* MODE_TSX need not be followed by FUP */
			if (!decoder->pge) {
				intel_pt_update_in_tx(decoder);
				break;
			}
			err = intel_pt_mode_tsx(decoder, &no_tip);
			if (err)
				return err;
			goto next;

		case INTEL_PT_BAD: /* Does not happen */
			return intel_pt_bug(decoder);

		case INTEL_PT_PSBEND:
		case INTEL_PT_VMCS:
		case INTEL_PT_MNT:
		case INTEL_PT_PAD:
			break;

		case INTEL_PT_PTWRITE_IP:
			decoder->fup_ptw_payload = decoder->packet.payload;
			err = intel_pt_get_next_packet(decoder);
			if (err)
				return err;
			if (decoder->packet.type == INTEL_PT_FUP) {
				decoder->set_fup_ptw = true;
				no_tip = true;
			} else {
				intel_pt_log_at("ERROR: Missing FUP after PTWRITE",
						decoder->pos);
			}
			goto next;

		case INTEL_PT_PTWRITE:
			decoder->state.type = INTEL_PT_PTW;
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = 0;
			decoder->state.ptw_payload = decoder->packet.payload;
			return 0;

		case INTEL_PT_MWAIT:
			decoder->fup_mwait_payload = decoder->packet.payload;
			decoder->set_fup_mwait = true;
			break;

		case INTEL_PT_PWRE:
			if (decoder->set_fup_mwait) {
				decoder->fup_pwre_payload =
							decoder->packet.payload;
				decoder->set_fup_pwre = true;
				break;
			}
			decoder->state.type = INTEL_PT_PWR_ENTRY;
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = 0;
			decoder->state.pwrx_payload = decoder->packet.payload;
			return 0;

		case INTEL_PT_EXSTOP_IP:
			err = intel_pt_get_next_packet(decoder);
			if (err)
				return err;
			if (decoder->packet.type == INTEL_PT_FUP) {
				decoder->set_fup_exstop = true;
				no_tip = true;
			} else {
				intel_pt_log_at("ERROR: Missing FUP after EXSTOP",
						decoder->pos);
			}
			goto next;

		case INTEL_PT_EXSTOP:
			decoder->state.type = INTEL_PT_EX_STOP;
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = 0;
			return 0;

		case INTEL_PT_PWRX:
			decoder->state.type = INTEL_PT_PWR_EXIT;
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = 0;
			decoder->state.pwrx_payload = decoder->packet.payload;
			return 0;

		case INTEL_PT_BBP:
			intel_pt_bbp(decoder);
			break;

		case INTEL_PT_BIP:
			intel_pt_bip(decoder);
			break;

		case INTEL_PT_BEP:
			decoder->state.type = INTEL_PT_BLK_ITEMS;
			decoder->state.from_ip = decoder->ip;
			decoder->state.to_ip = 0;
			return 0;

		case INTEL_PT_BEP_IP:
			err = intel_pt_get_next_packet(decoder);
			if (err)
				return err;
			if (decoder->packet.type == INTEL_PT_FUP) {
				decoder->set_fup_bep = true;
				no_tip = true;
			} else {
				intel_pt_log_at("ERROR: Missing FUP after BEP",
						decoder->pos);
			}
			goto next;

		default:
			return intel_pt_bug(decoder);
		}
	}
}

static inline bool intel_pt_have_ip(struct intel_pt_decoder *decoder)
{
	return decoder->packet.count &&
	       (decoder->have_last_ip || decoder->packet.count == 3 ||
		decoder->packet.count == 6);
}

/* Walk PSB+ packets to get in sync. */
static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
{
	int err;

	decoder->in_psb = true;

	while (1) {
		err = intel_pt_get_next_packet(decoder);
		if (err)
			goto out;

		switch (decoder->packet.type) {
		case INTEL_PT_TIP_PGD:
			decoder->continuous_period = false;
			__fallthrough;
		case INTEL_PT_TIP_PGE:
		case INTEL_PT_TIP:
		case INTEL_PT_PTWRITE:
		case INTEL_PT_PTWRITE_IP:
		case INTEL_PT_EXSTOP:
		case INTEL_PT_EXSTOP_IP:
		case INTEL_PT_MWAIT:
		case INTEL_PT_PWRE:
		case INTEL_PT_PWRX:
		case INTEL_PT_BBP:
		case INTEL_PT_BIP:
		case INTEL_PT_BEP:
		case INTEL_PT_BEP_IP:
			intel_pt_log("ERROR: Unexpected packet\n");
			err = -ENOENT;
			goto out;

		case INTEL_PT_FUP:
			decoder->pge = true;
			if (intel_pt_have_ip(decoder)) {
				uint64_t current_ip = decoder->ip;

				intel_pt_set_ip(decoder);
				if (current_ip)
					intel_pt_log_to("Setting IP",
							decoder->ip);
			}
			break;

		case INTEL_PT_MTC:
			intel_pt_calc_mtc_timestamp(decoder);
			break;

		case INTEL_PT_TSC:
			intel_pt_calc_tsc_timestamp(decoder);
			break;

		case INTEL_PT_TMA:
			intel_pt_calc_tma(decoder);
			break;

		case INTEL_PT_CYC:
			intel_pt_calc_cyc_timestamp(decoder);
			break;

		case INTEL_PT_CBR:
			intel_pt_calc_cbr(decoder);
			break;

		case INTEL_PT_PIP:
			decoder->cr3 = decoder->packet.payload & (BIT63 - 1);
			break;

		case INTEL_PT_MODE_EXEC:
			decoder->exec_mode = decoder->packet.payload;
			break;

		case INTEL_PT_MODE_TSX:
			intel_pt_update_in_tx(decoder);
			break;

		case INTEL_PT_TRACESTOP:
			decoder->pge = false;
			decoder->continuous_period = false;
			intel_pt_clear_tx_flags(decoder);
			__fallthrough;

		case INTEL_PT_TNT:
			decoder->have_tma = false;
			intel_pt_log("ERROR: Unexpected packet\n");
			if (decoder->ip)
				decoder->pkt_state = INTEL_PT_STATE_ERR4;
			else
				decoder->pkt_state = INTEL_PT_STATE_ERR3;
			err = -ENOENT;
			goto out;

		case INTEL_PT_BAD: /* Does not happen */
			err = intel_pt_bug(decoder);
			goto out;

		case INTEL_PT_OVF:
			err = intel_pt_overflow(decoder);
			goto out;

		case INTEL_PT_PSBEND:
			err = 0;
			goto out;

		case INTEL_PT_PSB:
		case INTEL_PT_VMCS:
		case INTEL_PT_MNT:
		case INTEL_PT_PAD:
		default:
			break;
		}
	}
out:
	decoder->in_psb = false;

	return err;
}

static int intel_pt_walk_to_ip(struct intel_pt_decoder *decoder)
{
	int err;

	while (1) {
		err = intel_pt_get_next_packet(decoder);
		if (err)
			return err;

		switch (decoder->packet.type) {
		case INTEL_PT_TIP_PGD:
			decoder->continuous_period = false;
			decoder->pge = false;
			if (intel_pt_have_ip(decoder))
				intel_pt_set_ip(decoder);
			if (!decoder->ip)
				break;
			decoder->state.type |= INTEL_PT_TRACE_END;
			return 0;

		case INTEL_PT_TIP_PGE:
			decoder->pge = true;
			intel_pt_mtc_cyc_cnt_pge(decoder);
			if (intel_pt_have_ip(decoder))
				intel_pt_set_ip(decoder);
			if (!decoder->ip)
				break;
			decoder->state.type |= INTEL_PT_TRACE_BEGIN;
			return 0;

		case INTEL_PT_TIP:
			decoder->pge = true;
			if (intel_pt_have_ip(decoder))
				intel_pt_set_ip(decoder);
			if (!decoder->ip)
				break;
			return 0;

		case INTEL_PT_FUP:
			if (intel_pt_have_ip(decoder))
				intel_pt_set_ip(decoder);
			if (decoder->ip)
				return 0;
			break;

		case INTEL_PT_MTC:
			intel_pt_calc_mtc_timestamp(decoder);
			break;

		case INTEL_PT_TSC:
			intel_pt_calc_tsc_timestamp(decoder);
			break;

		case INTEL_PT_TMA:
			intel_pt_calc_tma(decoder);
			break;

		case INTEL_PT_CYC:
			intel_pt_calc_cyc_timestamp(decoder);
			break;

		case INTEL_PT_CBR:
			intel_pt_calc_cbr(decoder);
			break;

		case INTEL_PT_PIP:
			decoder->cr3 = decoder->packet.payload & (BIT63 - 1);
			break;

		case INTEL_PT_MODE_EXEC:
			decoder->exec_mode = decoder->packet.payload;
			break;

		case INTEL_PT_MODE_TSX:
			intel_pt_update_in_tx(decoder);
			break;

		case INTEL_PT_OVF:
			return intel_pt_overflow(decoder);

		case INTEL_PT_BAD: /* Does not happen */
			return intel_pt_bug(decoder);

		case INTEL_PT_TRACESTOP:
			decoder->pge = false;
			decoder->continuous_period = false;
			intel_pt_clear_tx_flags(decoder);
			decoder->have_tma = false;
			break;

		case INTEL_PT_PSB:
			decoder->last_ip = 0;
			decoder->have_last_ip = true;
			intel_pt_clear_stack(&decoder->stack);
			err = intel_pt_walk_psb(decoder);
			if (err)
				return err;
			if (decoder->ip) {
				/* Do not have a sample */
				decoder->state.type = 0;
				return 0;
			}
			break;

		case INTEL_PT_TNT:
		case INTEL_PT_PSBEND:
		case INTEL_PT_VMCS:
		case INTEL_PT_MNT:
		case INTEL_PT_PAD:
		case INTEL_PT_PTWRITE:
		case INTEL_PT_PTWRITE_IP:
		case INTEL_PT_EXSTOP:
		case INTEL_PT_EXSTOP_IP:
		case INTEL_PT_MWAIT:
		case INTEL_PT_PWRE:
		case INTEL_PT_PWRX:
		case INTEL_PT_BBP:
		case INTEL_PT_BIP:
		case INTEL_PT_BEP:
		case INTEL_PT_BEP_IP:
		default:
			break;
		}
	}
}

static int intel_pt_sync_ip(struct intel_pt_decoder *decoder)
{
	int err;

	decoder->set_fup_tx_flags = false;
	decoder->set_fup_ptw = false;
	decoder->set_fup_mwait = false;
	decoder->set_fup_pwre = false;
	decoder->set_fup_exstop = false;
	decoder->set_fup_bep = false;

	if (!decoder->branch_enable) {
		decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
		decoder->overflow = false;
		decoder->state.type = 0; /* Do not have a sample */
		return 0;
	}

	intel_pt_log("Scanning for full IP\n");
	err = intel_pt_walk_to_ip(decoder);
	if (err)
		return err;

	decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
	decoder->overflow = false;

	decoder->state.from_ip = 0;
	decoder->state.to_ip = decoder->ip;
	intel_pt_log_to("Setting IP", decoder->ip);

	return 0;
}

static int intel_pt_part_psb(struct intel_pt_decoder *decoder)
{
	const unsigned char *end = decoder->buf + decoder->len;
	size_t i;

	for (i = INTEL_PT_PSB_LEN - 1; i; i--) {
		if (i > decoder->len)
			continue;
		if (!memcmp(end - i, INTEL_PT_PSB_STR, i))
			return i;
	}
	return 0;
}

static int intel_pt_rest_psb(struct intel_pt_decoder *decoder, int part_psb)
{
	size_t rest_psb = INTEL_PT_PSB_LEN - part_psb;
	const char *psb = INTEL_PT_PSB_STR;

	if (rest_psb > decoder->len ||
	    memcmp(decoder->buf, psb + part_psb, rest_psb))
		return 0;

	return rest_psb;
}

static int intel_pt_get_split_psb(struct intel_pt_decoder *decoder,
				  int part_psb)
{
	int rest_psb, ret;

	decoder->pos += decoder->len;
	decoder->len = 0;

	ret = intel_pt_get_next_data(decoder, false);
	if (ret)
		return ret;

	rest_psb = intel_pt_rest_psb(decoder, part_psb);
	if (!rest_psb)
		return 0;

	decoder->pos -= part_psb;
	decoder->next_buf = decoder->buf + rest_psb;
	decoder->next_len = decoder->len - rest_psb;
	memcpy(decoder->temp_buf, INTEL_PT_PSB_STR, INTEL_PT_PSB_LEN);
	decoder->buf = decoder->temp_buf;
	decoder->len = INTEL_PT_PSB_LEN;

	return 0;
}

static int intel_pt_scan_for_psb(struct intel_pt_decoder *decoder)
{
	unsigned char *next;
	int ret;

	intel_pt_log("Scanning for PSB\n");
	while (1) {
		if (!decoder->len) {
			ret = intel_pt_get_next_data(decoder, false);
			if (ret)
				return ret;
		}

		next = memmem(decoder->buf, decoder->len, INTEL_PT_PSB_STR,
			      INTEL_PT_PSB_LEN);
		if (!next) {
			int part_psb;

			part_psb = intel_pt_part_psb(decoder);
			if (part_psb) {
				ret = intel_pt_get_split_psb(decoder, part_psb);
				if (ret)
					return ret;
			} else {
				decoder->pos += decoder->len;
				decoder->len = 0;
			}
			continue;
		}

		decoder->pkt_step = next - decoder->buf;
		return intel_pt_get_next_packet(decoder);
	}
}

static int intel_pt_sync(struct intel_pt_decoder *decoder)
{
	int err;

	decoder->pge = false;
	decoder->continuous_period = false;
	decoder->have_last_ip = false;
	decoder->last_ip = 0;
	decoder->ip = 0;
	intel_pt_clear_stack(&decoder->stack);

	err = intel_pt_scan_for_psb(decoder);
	if (err)
		return err;

	decoder->have_last_ip = true;
	decoder->pkt_state = INTEL_PT_STATE_NO_IP;

	err = intel_pt_walk_psb(decoder);
	if (err)
		return err;

	if (decoder->ip) {
		decoder->state.type = 0; /* Do not have a sample */
		decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
	} else {
		return intel_pt_sync_ip(decoder);
	}

	return 0;
}

static uint64_t intel_pt_est_timestamp(struct intel_pt_decoder *decoder)
{
	uint64_t est = decoder->sample_insn_cnt << 1;

	if (!decoder->cbr || !decoder->max_non_turbo_ratio)
		goto out;

	est *= decoder->max_non_turbo_ratio;
	est /= decoder->cbr;
out:
	return decoder->sample_timestamp + est;
}

const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
{
	int err;

	do {
		decoder->state.type = INTEL_PT_BRANCH;
		decoder->state.flags = 0;

		switch (decoder->pkt_state) {
		case INTEL_PT_STATE_NO_PSB:
			err = intel_pt_sync(decoder);
			break;
		case INTEL_PT_STATE_NO_IP:
			decoder->have_last_ip = false;
			decoder->last_ip = 0;
			decoder->ip = 0;
			__fallthrough;
		case INTEL_PT_STATE_ERR_RESYNC:
			err = intel_pt_sync_ip(decoder);
			break;
		case INTEL_PT_STATE_IN_SYNC:
			err = intel_pt_walk_trace(decoder);
			break;
		case INTEL_PT_STATE_TNT:
		case INTEL_PT_STATE_TNT_CONT:
			err = intel_pt_walk_tnt(decoder);
			if (err == -EAGAIN)
				err = intel_pt_walk_trace(decoder);
			break;
		case INTEL_PT_STATE_TIP:
		case INTEL_PT_STATE_TIP_PGD:
			err = intel_pt_walk_tip(decoder);
			break;
		case INTEL_PT_STATE_FUP:
			decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
			err = intel_pt_walk_fup(decoder);
			if (err == -EAGAIN)
				err = intel_pt_walk_fup_tip(decoder);
			else if (!err)
				decoder->pkt_state = INTEL_PT_STATE_FUP;
			break;
		case INTEL_PT_STATE_FUP_NO_TIP:
			decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
			err = intel_pt_walk_fup(decoder);
			if (err == -EAGAIN)
				err = intel_pt_walk_trace(decoder);
			break;
		default:
			err = intel_pt_bug(decoder);
			break;
		}
	} while (err == -ENOLINK);

	if (err) {
		decoder->state.err = intel_pt_ext_err(err);
		decoder->state.from_ip = decoder->ip;
		intel_pt_update_sample_time(decoder);
		decoder->sample_tot_cyc_cnt = decoder->tot_cyc_cnt;
	} else {
		decoder->state.err = 0;
		if (decoder->cbr != decoder->cbr_seen) {
			decoder->cbr_seen = decoder->cbr;
			if (!decoder->state.type) {
				decoder->state.from_ip = decoder->ip;
				decoder->state.to_ip = 0;
			}
			decoder->state.type |= INTEL_PT_CBR_CHG;
			decoder->state.cbr_payload = decoder->cbr_payload;
			decoder->state.cbr = decoder->cbr;
		}
		if (intel_pt_sample_time(decoder->pkt_state)) {
			intel_pt_update_sample_time(decoder);
			if (decoder->sample_cyc)
				decoder->sample_tot_cyc_cnt = decoder->tot_cyc_cnt;
		}
	}

	decoder->state.timestamp = decoder->sample_timestamp;
	decoder->state.est_timestamp = intel_pt_est_timestamp(decoder);
	decoder->state.cr3 = decoder->cr3;
	decoder->state.tot_insn_cnt = decoder->tot_insn_cnt;
	decoder->state.tot_cyc_cnt = decoder->sample_tot_cyc_cnt;

	return &decoder->state;
}

/**
 * intel_pt_next_psb - move buffer pointer to the start of the next PSB packet.
 * @buf: pointer to buffer pointer
 * @len: size of buffer
 *
 * Updates the buffer pointer to point to the start of the next PSB packet if
 * there is one, otherwise the buffer pointer is unchanged.  If @buf is updated,
 * @len is adjusted accordingly.
 *
 * Return: %true if a PSB packet is found, %false otherwise.
 */
static bool intel_pt_next_psb(unsigned char **buf, size_t *len)
{
	unsigned char *next;

	next = memmem(*buf, *len, INTEL_PT_PSB_STR, INTEL_PT_PSB_LEN);
	if (next) {
		*len -= next - *buf;
		*buf = next;
		return true;
	}
	return false;
}

/**
 * intel_pt_step_psb - move buffer pointer to the start of the following PSB
 *                     packet.
 * @buf: pointer to buffer pointer
 * @len: size of buffer
 *
 * Updates the buffer pointer to point to the start of the following PSB packet
 * (skipping the PSB at @buf itself) if there is one, otherwise the buffer
 * pointer is unchanged.  If @buf is updated, @len is adjusted accordingly.
 *
 * Return: %true if a PSB packet is found, %false otherwise.
 */
static bool intel_pt_step_psb(unsigned char **buf, size_t *len)
{
	unsigned char *next;

	if (!*len)
		return false;

	next = memmem(*buf + 1, *len - 1, INTEL_PT_PSB_STR, INTEL_PT_PSB_LEN);
	if (next) {
		*len -= next - *buf;
		*buf = next;
		return true;
	}
	return false;
}

/**
 * intel_pt_last_psb - find the last PSB packet in a buffer.
 * @buf: buffer
 * @len: size of buffer
 *
 * This function finds the last PSB in a buffer.
 *
 * Return: A pointer to the last PSB in @buf if found, %NULL otherwise.
 */
static unsigned char *intel_pt_last_psb(unsigned char *buf, size_t len)
{
	const char *n = INTEL_PT_PSB_STR;
	unsigned char *p;
	size_t k;

	if (len < INTEL_PT_PSB_LEN)
		return NULL;

	k = len - INTEL_PT_PSB_LEN + 1;
	while (1) {
		p = memrchr(buf, n[0], k);
		if (!p)
			return NULL;
		if (!memcmp(p + 1, n + 1, INTEL_PT_PSB_LEN - 1))
			return p;
		k = p - buf;
		if (!k)
			return NULL;
	}
}

/**
 * intel_pt_next_tsc - find and return next TSC.
 * @buf: buffer
 * @len: size of buffer
 * @tsc: TSC value returned
 * @rem: returns remaining size when TSC is found
 *
 * Find a TSC packet in @buf and return the TSC value.  This function assumes
 * that @buf starts at a PSB and that PSB+ will contain TSC and so stops if a
 * PSBEND packet is found.
 *
 * Return: %true if TSC is found, false otherwise.
 */
static bool intel_pt_next_tsc(unsigned char *buf, size_t len, uint64_t *tsc,
			      size_t *rem)
{
	enum intel_pt_pkt_ctx ctx = INTEL_PT_NO_CTX;
	struct intel_pt_pkt packet;
	int ret;

	while (len) {
		ret = intel_pt_get_packet(buf, len, &packet, &ctx);
		if (ret <= 0)
			return false;
		if (packet.type == INTEL_PT_TSC) {
			*tsc = packet.payload;
			*rem = len;
			return true;
		}
		if (packet.type == INTEL_PT_PSBEND)
			return false;
		buf += ret;
		len -= ret;
	}
	return false;
}

/**
 * intel_pt_tsc_cmp - compare 7-byte TSCs.
 * @tsc1: first TSC to compare
 * @tsc2: second TSC to compare
 *
 * This function compares 7-byte TSC values allowing for the possibility that
 * TSC wrapped around.  Generally it is not possible to know if TSC has wrapped
 * around so for that purpose this function assumes the absolute difference is
 * less than half the maximum difference.
 *
 * Return: %-1 if @tsc1 is before @tsc2, %0 if @tsc1 == @tsc2, %1 if @tsc1 is
 * after @tsc2.
 */
static int intel_pt_tsc_cmp(uint64_t tsc1, uint64_t tsc2)
{
	const uint64_t halfway = (1ULL << 55);

	if (tsc1 == tsc2)
		return 0;

	if (tsc1 < tsc2) {
		if (tsc2 - tsc1 < halfway)
			return -1;
		else
			return 1;
	} else {
		if (tsc1 - tsc2 < halfway)
			return 1;
		else
			return -1;
	}
}

#define MAX_PADDING (PERF_AUXTRACE_RECORD_ALIGNMENT - 1)

/**
 * adj_for_padding - adjust overlap to account for padding.
 * @buf_b: second buffer
 * @buf_a: first buffer
 * @len_a: size of first buffer
 *
 * @buf_a might have up to 7 bytes of padding appended. Adjust the overlap
 * accordingly.
 *
 * Return: A pointer into @buf_b from where non-overlapped data starts
 */
static unsigned char *adj_for_padding(unsigned char *buf_b,
				      unsigned char *buf_a, size_t len_a)
{
	unsigned char *p = buf_b - MAX_PADDING;
	unsigned char *q = buf_a + len_a - MAX_PADDING;
	int i;

	for (i = MAX_PADDING; i; i--, p++, q++) {
		if (*p != *q)
			break;
	}

	return p;
}

/**
 * intel_pt_find_overlap_tsc - determine start of non-overlapped trace data
 *                             using TSC.
 * @buf_a: first buffer
 * @len_a: size of first buffer
 * @buf_b: second buffer
 * @len_b: size of second buffer
 * @consecutive: returns true if there is data in buf_b that is consecutive
 *               to buf_a
 *
 * If the trace contains TSC we can look at the last TSC of @buf_a and the
 * first TSC of @buf_b in order to determine if the buffers overlap, and then
 * walk forward in @buf_b until a later TSC is found.  A precondition is that
 * @buf_a and @buf_b are positioned at a PSB.
 *
 * Return: A pointer into @buf_b from where non-overlapped data starts, or
 * @buf_b + @len_b if there is no non-overlapped data.
 */
static unsigned char *intel_pt_find_overlap_tsc(unsigned char *buf_a,
						size_t len_a,
						unsigned char *buf_b,
						size_t len_b, bool *consecutive)
{
	uint64_t tsc_a, tsc_b;
	unsigned char *p;
	size_t len, rem_a, rem_b;

	p = intel_pt_last_psb(buf_a, len_a);
	if (!p)
		return buf_b; /* No PSB in buf_a => no overlap */

	len = len_a - (p - buf_a);
	if (!intel_pt_next_tsc(p, len, &tsc_a, &rem_a)) {
		/* The last PSB+ in buf_a is incomplete, so go back one more */
		len_a -= len;
		p = intel_pt_last_psb(buf_a, len_a);
		if (!p)
			return buf_b; /* No full PSB+ => assume no overlap */
		len = len_a - (p - buf_a);
		if (!intel_pt_next_tsc(p, len, &tsc_a, &rem_a))
			return buf_b; /* No TSC in buf_a => assume no overlap */
	}

	while (1) {
		/* Ignore PSB+ with no TSC */
		if (intel_pt_next_tsc(buf_b, len_b, &tsc_b, &rem_b)) {
			int cmp = intel_pt_tsc_cmp(tsc_a, tsc_b);

			/* Same TSC, so buffers are consecutive */
			if (!cmp && rem_b >= rem_a) {
				unsigned char *start;

				*consecutive = true;
				start = buf_b + len_b - (rem_b - rem_a);
				return adj_for_padding(start, buf_a, len_a);
			}
			if (cmp < 0)
				return buf_b; /* tsc_a < tsc_b => no overlap */
		}

		if (!intel_pt_step_psb(&buf_b, &len_b))
			return buf_b + len_b; /* No PSB in buf_b => no data */
	}
}

/**
 * intel_pt_find_overlap - determine start of non-overlapped trace data.
 * @buf_a: first buffer
 * @len_a: size of first buffer
 * @buf_b: second buffer
 * @len_b: size of second buffer
 * @have_tsc: can use TSC packets to detect overlap
 * @consecutive: returns true if there is data in buf_b that is consecutive
 *               to buf_a
 *
 * When trace samples or snapshots are recorded there is the possibility that
 * the data overlaps.  Note that, for the purposes of decoding, data is only
 * useful if it begins with a PSB packet.
 *
 * Return: A pointer into @buf_b from where non-overlapped data starts, or
 * @buf_b + @len_b if there is no non-overlapped data.
 */
unsigned char *intel_pt_find_overlap(unsigned char *buf_a, size_t len_a,
				     unsigned char *buf_b, size_t len_b,
				     bool have_tsc, bool *consecutive)
{
	unsigned char *found;

	/* Buffer 'b' must start at PSB so throw away everything before that */
	if (!intel_pt_next_psb(&buf_b, &len_b))
		return buf_b + len_b; /* No PSB */

	if (!intel_pt_next_psb(&buf_a, &len_a))
		return buf_b; /* No overlap */

	if (have_tsc) {
		found = intel_pt_find_overlap_tsc(buf_a, len_a, buf_b, len_b,
						  consecutive);
		if (found)
			return found;
	}

	/*
	 * Buffer 'b' cannot end within buffer 'a' so, for comparison purposes,
	 * we can ignore the first part of buffer 'a'.
	 */
	while (len_b < len_a) {
		if (!intel_pt_step_psb(&buf_a, &len_a))
			return buf_b; /* No overlap */
	}

	/* Now len_b >= len_a */
	while (1) {
		/* Potential overlap so check the bytes */
		found = memmem(buf_a, len_a, buf_b, len_a);
		if (found) {
			*consecutive = true;
			return adj_for_padding(buf_b + len_a, buf_a, len_a);
		}

		/* Try again at next PSB in buffer 'a' */
		if (!intel_pt_step_psb(&buf_a, &len_a))
			return buf_b; /* No overlap */
	}
}

/**
 * struct fast_forward_data - data used by intel_pt_ff_cb().
 * @timestamp: timestamp to fast forward towards
 * @buf_timestamp: buffer timestamp of last buffer with trace data earlier than
 *                 the fast forward timestamp.
 */
struct fast_forward_data {
	uint64_t timestamp;
	uint64_t buf_timestamp;
};

/**
 * intel_pt_ff_cb - fast forward lookahead callback.
 * @buffer: Intel PT trace buffer
 * @data: opaque pointer to fast forward data (struct fast_forward_data)
 *
 * Determine if @buffer trace is past the fast forward timestamp.
 *
 * Return: 1 (stop lookahead) if @buffer trace is past the fast forward
 *         timestamp, and 0 otherwise.
 */
static int intel_pt_ff_cb(struct intel_pt_buffer *buffer, void *data)
{
	struct fast_forward_data *d = data;
	unsigned char *buf;
	uint64_t tsc;
	size_t rem;
	size_t len;

	buf = (unsigned char *)buffer->buf;
	len = buffer->len;

	if (!intel_pt_next_psb(&buf, &len) ||
	    !intel_pt_next_tsc(buf, len, &tsc, &rem))
		return 0;

	tsc = intel_pt_8b_tsc(tsc, buffer->ref_timestamp);

	intel_pt_log("Buffer 1st timestamp " x64_fmt " ref timestamp " x64_fmt "\n",
		     tsc, buffer->ref_timestamp);

	/*
	 * If the buffer contains a timestamp earlier that the fast forward
	 * timestamp, then record it, else stop.
	 */
	if (tsc < d->timestamp)
		d->buf_timestamp = buffer->ref_timestamp;
	else
		return 1;

	return 0;
}

/**
 * intel_pt_fast_forward - reposition decoder forwards.
 * @decoder: Intel PT decoder
 * @timestamp: timestamp to fast forward towards
 *
 * Reposition decoder at the last PSB with a timestamp earlier than @timestamp.
 *
 * Return: 0 on success or negative error code on failure.
 */
int intel_pt_fast_forward(struct intel_pt_decoder *decoder, uint64_t timestamp)
{
	struct fast_forward_data d = { .timestamp = timestamp };
	unsigned char *buf;
	size_t len;
	int err;

	intel_pt_log("Fast forward towards timestamp " x64_fmt "\n", timestamp);

	/* Find buffer timestamp of buffer to fast forward to */
	err = decoder->lookahead(decoder->data, intel_pt_ff_cb, &d);
	if (err < 0)
		return err;

	/* Walk to buffer with same buffer timestamp */
	if (d.buf_timestamp) {
		do {
			decoder->pos += decoder->len;
			decoder->len = 0;
			err = intel_pt_get_next_data(decoder, true);
			/* -ENOLINK means non-consecutive trace */
			if (err && err != -ENOLINK)
				return err;
		} while (decoder->buf_timestamp != d.buf_timestamp);
	}

	if (!decoder->buf)
		return 0;

	buf = (unsigned char *)decoder->buf;
	len = decoder->len;

	if (!intel_pt_next_psb(&buf, &len))
		return 0;

	/*
	 * Walk PSBs while the PSB timestamp is less than the fast forward
	 * timestamp.
	 */
	do {
		uint64_t tsc;
		size_t rem;

		if (!intel_pt_next_tsc(buf, len, &tsc, &rem))
			break;
		tsc = intel_pt_8b_tsc(tsc, decoder->buf_timestamp);
		/*
		 * A TSC packet can slip past MTC packets but, after fast
		 * forward, decoding starts at the TSC timestamp. That means
		 * the timestamps may not be exactly the same as the timestamps
		 * that would have been decoded without fast forward.
		 */
		if (tsc < timestamp) {
			intel_pt_log("Fast forward to next PSB timestamp " x64_fmt "\n", tsc);
			decoder->pos += decoder->len - len;
			decoder->buf = buf;
			decoder->len = len;
			intel_pt_reposition(decoder);
		} else {
			break;
		}
	} while (intel_pt_step_psb(&buf, &len));

	return 0;
}