summaryrefslogtreecommitdiffstats
path: root/drivers/thunderbolt/switch.c
blob: 7b086923cec6b2591eb5e9998f5986cf01df07ca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
// SPDX-License-Identifier: GPL-2.0
/*
 * Thunderbolt driver - switch/port utility functions
 *
 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
 * Copyright (C) 2018, Intel Corporation
 */

#include <linux/delay.h>
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/pm_runtime.h>
#include <linux/sched/signal.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/string_helpers.h>

#include "tb.h"

/* Switch NVM support */

struct nvm_auth_status {
	struct list_head list;
	uuid_t uuid;
	u32 status;
};

/*
 * Hold NVM authentication failure status per switch This information
 * needs to stay around even when the switch gets power cycled so we
 * keep it separately.
 */
static LIST_HEAD(nvm_auth_status_cache);
static DEFINE_MUTEX(nvm_auth_status_lock);

static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
{
	struct nvm_auth_status *st;

	list_for_each_entry(st, &nvm_auth_status_cache, list) {
		if (uuid_equal(&st->uuid, sw->uuid))
			return st;
	}

	return NULL;
}

static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
{
	struct nvm_auth_status *st;

	mutex_lock(&nvm_auth_status_lock);
	st = __nvm_get_auth_status(sw);
	mutex_unlock(&nvm_auth_status_lock);

	*status = st ? st->status : 0;
}

static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
{
	struct nvm_auth_status *st;

	if (WARN_ON(!sw->uuid))
		return;

	mutex_lock(&nvm_auth_status_lock);
	st = __nvm_get_auth_status(sw);

	if (!st) {
		st = kzalloc(sizeof(*st), GFP_KERNEL);
		if (!st)
			goto unlock;

		memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
		INIT_LIST_HEAD(&st->list);
		list_add_tail(&st->list, &nvm_auth_status_cache);
	}

	st->status = status;
unlock:
	mutex_unlock(&nvm_auth_status_lock);
}

static void nvm_clear_auth_status(const struct tb_switch *sw)
{
	struct nvm_auth_status *st;

	mutex_lock(&nvm_auth_status_lock);
	st = __nvm_get_auth_status(sw);
	if (st) {
		list_del(&st->list);
		kfree(st);
	}
	mutex_unlock(&nvm_auth_status_lock);
}

static int nvm_validate_and_write(struct tb_switch *sw)
{
	unsigned int image_size;
	const u8 *buf;
	int ret;

	ret = tb_nvm_validate(sw->nvm);
	if (ret)
		return ret;

	ret = tb_nvm_write_headers(sw->nvm);
	if (ret)
		return ret;

	buf = sw->nvm->buf_data_start;
	image_size = sw->nvm->buf_data_size;

	if (tb_switch_is_usb4(sw))
		ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
	else
		ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
	if (ret)
		return ret;

	sw->nvm->flushed = true;
	return 0;
}

static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
{
	int ret = 0;

	/*
	 * Root switch NVM upgrade requires that we disconnect the
	 * existing paths first (in case it is not in safe mode
	 * already).
	 */
	if (!sw->safe_mode) {
		u32 status;

		ret = tb_domain_disconnect_all_paths(sw->tb);
		if (ret)
			return ret;
		/*
		 * The host controller goes away pretty soon after this if
		 * everything goes well so getting timeout is expected.
		 */
		ret = dma_port_flash_update_auth(sw->dma_port);
		if (!ret || ret == -ETIMEDOUT)
			return 0;

		/*
		 * Any error from update auth operation requires power
		 * cycling of the host router.
		 */
		tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
		if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
			nvm_set_auth_status(sw, status);
	}

	/*
	 * From safe mode we can get out by just power cycling the
	 * switch.
	 */
	dma_port_power_cycle(sw->dma_port);
	return ret;
}

static int nvm_authenticate_device_dma_port(struct tb_switch *sw)
{
	int ret, retries = 10;

	ret = dma_port_flash_update_auth(sw->dma_port);
	switch (ret) {
	case 0:
	case -ETIMEDOUT:
	case -EACCES:
	case -EINVAL:
		/* Power cycle is required */
		break;
	default:
		return ret;
	}

	/*
	 * Poll here for the authentication status. It takes some time
	 * for the device to respond (we get timeout for a while). Once
	 * we get response the device needs to be power cycled in order
	 * to the new NVM to be taken into use.
	 */
	do {
		u32 status;

		ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
		if (ret < 0 && ret != -ETIMEDOUT)
			return ret;
		if (ret > 0) {
			if (status) {
				tb_sw_warn(sw, "failed to authenticate NVM\n");
				nvm_set_auth_status(sw, status);
			}

			tb_sw_info(sw, "power cycling the switch now\n");
			dma_port_power_cycle(sw->dma_port);
			return 0;
		}

		msleep(500);
	} while (--retries);

	return -ETIMEDOUT;
}

static void nvm_authenticate_start_dma_port(struct tb_switch *sw)
{
	struct pci_dev *root_port;

	/*
	 * During host router NVM upgrade we should not allow root port to
	 * go into D3cold because some root ports cannot trigger PME
	 * itself. To be on the safe side keep the root port in D0 during
	 * the whole upgrade process.
	 */
	root_port = pcie_find_root_port(sw->tb->nhi->pdev);
	if (root_port)
		pm_runtime_get_noresume(&root_port->dev);
}

static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)
{
	struct pci_dev *root_port;

	root_port = pcie_find_root_port(sw->tb->nhi->pdev);
	if (root_port)
		pm_runtime_put(&root_port->dev);
}

static inline bool nvm_readable(struct tb_switch *sw)
{
	if (tb_switch_is_usb4(sw)) {
		/*
		 * USB4 devices must support NVM operations but it is
		 * optional for hosts. Therefore we query the NVM sector
		 * size here and if it is supported assume NVM
		 * operations are implemented.
		 */
		return usb4_switch_nvm_sector_size(sw) > 0;
	}

	/* Thunderbolt 2 and 3 devices support NVM through DMA port */
	return !!sw->dma_port;
}

static inline bool nvm_upgradeable(struct tb_switch *sw)
{
	if (sw->no_nvm_upgrade)
		return false;
	return nvm_readable(sw);
}

static int nvm_authenticate(struct tb_switch *sw, bool auth_only)
{
	int ret;

	if (tb_switch_is_usb4(sw)) {
		if (auth_only) {
			ret = usb4_switch_nvm_set_offset(sw, 0);
			if (ret)
				return ret;
		}
		sw->nvm->authenticating = true;
		return usb4_switch_nvm_authenticate(sw);
	}
	if (auth_only)
		return -EOPNOTSUPP;

	sw->nvm->authenticating = true;
	if (!tb_route(sw)) {
		nvm_authenticate_start_dma_port(sw);
		ret = nvm_authenticate_host_dma_port(sw);
	} else {
		ret = nvm_authenticate_device_dma_port(sw);
	}

	return ret;
}

/**
 * tb_switch_nvm_read() - Read router NVM
 * @sw: Router whose NVM to read
 * @address: Start address on the NVM
 * @buf: Buffer where the read data is copied
 * @size: Size of the buffer in bytes
 *
 * Reads from router NVM and returns the requested data in @buf. Locking
 * is up to the caller. Returns %0 in success and negative errno in case
 * of failure.
 */
int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
		       size_t size)
{
	if (tb_switch_is_usb4(sw))
		return usb4_switch_nvm_read(sw, address, buf, size);
	return dma_port_flash_read(sw->dma_port, address, buf, size);
}

static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes)
{
	struct tb_nvm *nvm = priv;
	struct tb_switch *sw = tb_to_switch(nvm->dev);
	int ret;

	pm_runtime_get_sync(&sw->dev);

	if (!mutex_trylock(&sw->tb->lock)) {
		ret = restart_syscall();
		goto out;
	}

	ret = tb_switch_nvm_read(sw, offset, val, bytes);
	mutex_unlock(&sw->tb->lock);

out:
	pm_runtime_mark_last_busy(&sw->dev);
	pm_runtime_put_autosuspend(&sw->dev);

	return ret;
}

static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes)
{
	struct tb_nvm *nvm = priv;
	struct tb_switch *sw = tb_to_switch(nvm->dev);
	int ret;

	if (!mutex_trylock(&sw->tb->lock))
		return restart_syscall();

	/*
	 * Since writing the NVM image might require some special steps,
	 * for example when CSS headers are written, we cache the image
	 * locally here and handle the special cases when the user asks
	 * us to authenticate the image.
	 */
	ret = tb_nvm_write_buf(nvm, offset, val, bytes);
	mutex_unlock(&sw->tb->lock);

	return ret;
}

static int tb_switch_nvm_add(struct tb_switch *sw)
{
	struct tb_nvm *nvm;
	int ret;

	if (!nvm_readable(sw))
		return 0;

	nvm = tb_nvm_alloc(&sw->dev);
	if (IS_ERR(nvm)) {
		ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm);
		goto err_nvm;
	}

	ret = tb_nvm_read_version(nvm);
	if (ret)
		goto err_nvm;

	/*
	 * If the switch is in safe-mode the only accessible portion of
	 * the NVM is the non-active one where userspace is expected to
	 * write new functional NVM.
	 */
	if (!sw->safe_mode) {
		ret = tb_nvm_add_active(nvm, nvm_read);
		if (ret)
			goto err_nvm;
		tb_sw_dbg(sw, "NVM version %x.%x\n", nvm->major, nvm->minor);
	}

	if (!sw->no_nvm_upgrade) {
		ret = tb_nvm_add_non_active(nvm, nvm_write);
		if (ret)
			goto err_nvm;
	}

	sw->nvm = nvm;
	return 0;

err_nvm:
	tb_sw_dbg(sw, "NVM upgrade disabled\n");
	sw->no_nvm_upgrade = true;
	if (!IS_ERR(nvm))
		tb_nvm_free(nvm);

	return ret;
}

static void tb_switch_nvm_remove(struct tb_switch *sw)
{
	struct tb_nvm *nvm;

	nvm = sw->nvm;
	sw->nvm = NULL;

	if (!nvm)
		return;

	/* Remove authentication status in case the switch is unplugged */
	if (!nvm->authenticating)
		nvm_clear_auth_status(sw);

	tb_nvm_free(nvm);
}

/* port utility functions */

static const char *tb_port_type(const struct tb_regs_port_header *port)
{
	switch (port->type >> 16) {
	case 0:
		switch ((u8) port->type) {
		case 0:
			return "Inactive";
		case 1:
			return "Port";
		case 2:
			return "NHI";
		default:
			return "unknown";
		}
	case 0x2:
		return "Ethernet";
	case 0x8:
		return "SATA";
	case 0xe:
		return "DP/HDMI";
	case 0x10:
		return "PCIe";
	case 0x20:
		return "USB";
	default:
		return "unknown";
	}
}

static void tb_dump_port(struct tb *tb, const struct tb_port *port)
{
	const struct tb_regs_port_header *regs = &port->config;

	tb_dbg(tb,
	       " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
	       regs->port_number, regs->vendor_id, regs->device_id,
	       regs->revision, regs->thunderbolt_version, tb_port_type(regs),
	       regs->type);
	tb_dbg(tb, "  Max hop id (in/out): %d/%d\n",
	       regs->max_in_hop_id, regs->max_out_hop_id);
	tb_dbg(tb, "  Max counters: %d\n", regs->max_counters);
	tb_dbg(tb, "  NFC Credits: %#x\n", regs->nfc_credits);
	tb_dbg(tb, "  Credits (total/control): %u/%u\n", port->total_credits,
	       port->ctl_credits);
}

/**
 * tb_port_state() - get connectedness state of a port
 * @port: the port to check
 *
 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
 *
 * Return: Returns an enum tb_port_state on success or an error code on failure.
 */
int tb_port_state(struct tb_port *port)
{
	struct tb_cap_phy phy;
	int res;
	if (port->cap_phy == 0) {
		tb_port_WARN(port, "does not have a PHY\n");
		return -EINVAL;
	}
	res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
	if (res)
		return res;
	return phy.state;
}

/**
 * tb_wait_for_port() - wait for a port to become ready
 * @port: Port to wait
 * @wait_if_unplugged: Wait also when port is unplugged
 *
 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
 * wait_if_unplugged is set then we also wait if the port is in state
 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
 * switch resume). Otherwise we only wait if a device is registered but the link
 * has not yet been established.
 *
 * Return: Returns an error code on failure. Returns 0 if the port is not
 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
 * if the port is connected and in state TB_PORT_UP.
 */
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
{
	int retries = 10;
	int state;
	if (!port->cap_phy) {
		tb_port_WARN(port, "does not have PHY\n");
		return -EINVAL;
	}
	if (tb_is_upstream_port(port)) {
		tb_port_WARN(port, "is the upstream port\n");
		return -EINVAL;
	}

	while (retries--) {
		state = tb_port_state(port);
		switch (state) {
		case TB_PORT_DISABLED:
			tb_port_dbg(port, "is disabled (state: 0)\n");
			return 0;

		case TB_PORT_UNPLUGGED:
			if (wait_if_unplugged) {
				/* used during resume */
				tb_port_dbg(port,
					    "is unplugged (state: 7), retrying...\n");
				msleep(100);
				break;
			}
			tb_port_dbg(port, "is unplugged (state: 7)\n");
			return 0;

		case TB_PORT_UP:
		case TB_PORT_TX_CL0S:
		case TB_PORT_RX_CL0S:
		case TB_PORT_CL1:
		case TB_PORT_CL2:
			tb_port_dbg(port, "is connected, link is up (state: %d)\n", state);
			return 1;

		default:
			if (state < 0)
				return state;

			/*
			 * After plug-in the state is TB_PORT_CONNECTING. Give it some
			 * time.
			 */
			tb_port_dbg(port,
				    "is connected, link is not up (state: %d), retrying...\n",
				    state);
			msleep(100);
		}

	}
	tb_port_warn(port,
		     "failed to reach state TB_PORT_UP. Ignoring port...\n");
	return 0;
}

/**
 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
 * @port: Port to add/remove NFC credits
 * @credits: Credits to add/remove
 *
 * Change the number of NFC credits allocated to @port by @credits. To remove
 * NFC credits pass a negative amount of credits.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
int tb_port_add_nfc_credits(struct tb_port *port, int credits)
{
	u32 nfc_credits;

	if (credits == 0 || port->sw->is_unplugged)
		return 0;

	/*
	 * USB4 restricts programming NFC buffers to lane adapters only
	 * so skip other ports.
	 */
	if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
		return 0;

	nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
	if (credits < 0)
		credits = max_t(int, -nfc_credits, credits);

	nfc_credits += credits;

	tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
		    port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);

	port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
	port->config.nfc_credits |= nfc_credits;

	return tb_port_write(port, &port->config.nfc_credits,
			     TB_CFG_PORT, ADP_CS_4, 1);
}

/**
 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
 * @port: Port whose counters to clear
 * @counter: Counter index to clear
 *
 * Return: Returns 0 on success or an error code on failure.
 */
int tb_port_clear_counter(struct tb_port *port, int counter)
{
	u32 zero[3] = { 0, 0, 0 };
	tb_port_dbg(port, "clearing counter %d\n", counter);
	return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
}

/**
 * tb_port_unlock() - Unlock downstream port
 * @port: Port to unlock
 *
 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
 * downstream router accessible for CM.
 */
int tb_port_unlock(struct tb_port *port)
{
	if (tb_switch_is_icm(port->sw))
		return 0;
	if (!tb_port_is_null(port))
		return -EINVAL;
	if (tb_switch_is_usb4(port->sw))
		return usb4_port_unlock(port);
	return 0;
}

static int __tb_port_enable(struct tb_port *port, bool enable)
{
	int ret;
	u32 phy;

	if (!tb_port_is_null(port))
		return -EINVAL;

	ret = tb_port_read(port, &phy, TB_CFG_PORT,
			   port->cap_phy + LANE_ADP_CS_1, 1);
	if (ret)
		return ret;

	if (enable)
		phy &= ~LANE_ADP_CS_1_LD;
	else
		phy |= LANE_ADP_CS_1_LD;


	ret = tb_port_write(port, &phy, TB_CFG_PORT,
			    port->cap_phy + LANE_ADP_CS_1, 1);
	if (ret)
		return ret;

	tb_port_dbg(port, "lane %s\n", str_enabled_disabled(enable));
	return 0;
}

/**
 * tb_port_enable() - Enable lane adapter
 * @port: Port to enable (can be %NULL)
 *
 * This is used for lane 0 and 1 adapters to enable it.
 */
int tb_port_enable(struct tb_port *port)
{
	return __tb_port_enable(port, true);
}

/**
 * tb_port_disable() - Disable lane adapter
 * @port: Port to disable (can be %NULL)
 *
 * This is used for lane 0 and 1 adapters to disable it.
 */
int tb_port_disable(struct tb_port *port)
{
	return __tb_port_enable(port, false);
}

static int tb_port_reset(struct tb_port *port)
{
	if (tb_switch_is_usb4(port->sw))
		return port->cap_usb4 ? usb4_port_reset(port) : 0;
	return tb_lc_reset_port(port);
}

/*
 * tb_init_port() - initialize a port
 *
 * This is a helper method for tb_switch_alloc. Does not check or initialize
 * any downstream switches.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
static int tb_init_port(struct tb_port *port)
{
	int res;
	int cap;

	INIT_LIST_HEAD(&port->list);

	/* Control adapter does not have configuration space */
	if (!port->port)
		return 0;

	res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
	if (res) {
		if (res == -ENODEV) {
			tb_dbg(port->sw->tb, " Port %d: not implemented\n",
			       port->port);
			port->disabled = true;
			return 0;
		}
		return res;
	}

	/* Port 0 is the switch itself and has no PHY. */
	if (port->config.type == TB_TYPE_PORT) {
		cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);

		if (cap > 0)
			port->cap_phy = cap;
		else
			tb_port_WARN(port, "non switch port without a PHY\n");

		cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
		if (cap > 0)
			port->cap_usb4 = cap;

		/*
		 * USB4 ports the buffers allocated for the control path
		 * can be read from the path config space. Legacy
		 * devices we use hard-coded value.
		 */
		if (port->cap_usb4) {
			struct tb_regs_hop hop;

			if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
				port->ctl_credits = hop.initial_credits;
		}
		if (!port->ctl_credits)
			port->ctl_credits = 2;

	} else {
		cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
		if (cap > 0)
			port->cap_adap = cap;
	}

	port->total_credits =
		(port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
		ADP_CS_4_TOTAL_BUFFERS_SHIFT;

	tb_dump_port(port->sw->tb, port);
	return 0;
}

static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
			       int max_hopid)
{
	int port_max_hopid;
	struct ida *ida;

	if (in) {
		port_max_hopid = port->config.max_in_hop_id;
		ida = &port->in_hopids;
	} else {
		port_max_hopid = port->config.max_out_hop_id;
		ida = &port->out_hopids;
	}

	/*
	 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
	 * reserved.
	 */
	if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
		min_hopid = TB_PATH_MIN_HOPID;

	if (max_hopid < 0 || max_hopid > port_max_hopid)
		max_hopid = port_max_hopid;

	return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
}

/**
 * tb_port_alloc_in_hopid() - Allocate input HopID from port
 * @port: Port to allocate HopID for
 * @min_hopid: Minimum acceptable input HopID
 * @max_hopid: Maximum acceptable input HopID
 *
 * Return: HopID between @min_hopid and @max_hopid or negative errno in
 * case of error.
 */
int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
{
	return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
}

/**
 * tb_port_alloc_out_hopid() - Allocate output HopID from port
 * @port: Port to allocate HopID for
 * @min_hopid: Minimum acceptable output HopID
 * @max_hopid: Maximum acceptable output HopID
 *
 * Return: HopID between @min_hopid and @max_hopid or negative errno in
 * case of error.
 */
int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
{
	return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
}

/**
 * tb_port_release_in_hopid() - Release allocated input HopID from port
 * @port: Port whose HopID to release
 * @hopid: HopID to release
 */
void tb_port_release_in_hopid(struct tb_port *port, int hopid)
{
	ida_simple_remove(&port->in_hopids, hopid);
}

/**
 * tb_port_release_out_hopid() - Release allocated output HopID from port
 * @port: Port whose HopID to release
 * @hopid: HopID to release
 */
void tb_port_release_out_hopid(struct tb_port *port, int hopid)
{
	ida_simple_remove(&port->out_hopids, hopid);
}

static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
					  const struct tb_switch *sw)
{
	u64 mask = (1ULL << parent->config.depth * 8) - 1;
	return (tb_route(parent) & mask) == (tb_route(sw) & mask);
}

/**
 * tb_next_port_on_path() - Return next port for given port on a path
 * @start: Start port of the walk
 * @end: End port of the walk
 * @prev: Previous port (%NULL if this is the first)
 *
 * This function can be used to walk from one port to another if they
 * are connected through zero or more switches. If the @prev is dual
 * link port, the function follows that link and returns another end on
 * that same link.
 *
 * If the @end port has been reached, return %NULL.
 *
 * Domain tb->lock must be held when this function is called.
 */
struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
				     struct tb_port *prev)
{
	struct tb_port *next;

	if (!prev)
		return start;

	if (prev->sw == end->sw) {
		if (prev == end)
			return NULL;
		return end;
	}

	if (tb_switch_is_reachable(prev->sw, end->sw)) {
		next = tb_port_at(tb_route(end->sw), prev->sw);
		/* Walk down the topology if next == prev */
		if (prev->remote &&
		    (next == prev || next->dual_link_port == prev))
			next = prev->remote;
	} else {
		if (tb_is_upstream_port(prev)) {
			next = prev->remote;
		} else {
			next = tb_upstream_port(prev->sw);
			/*
			 * Keep the same link if prev and next are both
			 * dual link ports.
			 */
			if (next->dual_link_port &&
			    next->link_nr != prev->link_nr) {
				next = next->dual_link_port;
			}
		}
	}

	return next != prev ? next : NULL;
}

/**
 * tb_port_get_link_speed() - Get current link speed
 * @port: Port to check (USB4 or CIO)
 *
 * Returns link speed in Gb/s or negative errno in case of failure.
 */
int tb_port_get_link_speed(struct tb_port *port)
{
	u32 val, speed;
	int ret;

	if (!port->cap_phy)
		return -EINVAL;

	ret = tb_port_read(port, &val, TB_CFG_PORT,
			   port->cap_phy + LANE_ADP_CS_1, 1);
	if (ret)
		return ret;

	speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
		LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;

	switch (speed) {
	case LANE_ADP_CS_1_CURRENT_SPEED_GEN4:
		return 40;
	case LANE_ADP_CS_1_CURRENT_SPEED_GEN3:
		return 20;
	default:
		return 10;
	}
}

/**
 * tb_port_get_link_generation() - Returns link generation
 * @port: Lane adapter
 *
 * Returns link generation as number or negative errno in case of
 * failure. Does not distinguish between Thunderbolt 1 and Thunderbolt 2
 * links so for those always returns 2.
 */
int tb_port_get_link_generation(struct tb_port *port)
{
	int ret;

	ret = tb_port_get_link_speed(port);
	if (ret < 0)
		return ret;

	switch (ret) {
	case 40:
		return 4;
	case 20:
		return 3;
	default:
		return 2;
	}
}

/**
 * tb_port_get_link_width() - Get current link width
 * @port: Port to check (USB4 or CIO)
 *
 * Returns link width. Return the link width as encoded in &enum
 * tb_link_width or negative errno in case of failure.
 */
int tb_port_get_link_width(struct tb_port *port)
{
	u32 val;
	int ret;

	if (!port->cap_phy)
		return -EINVAL;

	ret = tb_port_read(port, &val, TB_CFG_PORT,
			   port->cap_phy + LANE_ADP_CS_1, 1);
	if (ret)
		return ret;

	/* Matches the values in enum tb_link_width */
	return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
		LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
}

/**
 * tb_port_width_supported() - Is the given link width supported
 * @port: Port to check
 * @width: Widths to check (bitmask)
 *
 * Can be called to any lane adapter. Checks if given @width is
 * supported by the hardware and returns %true if it is.
 */
bool tb_port_width_supported(struct tb_port *port, unsigned int width)
{
	u32 phy, widths;
	int ret;

	if (!port->cap_phy)
		return false;

	if (width & (TB_LINK_WIDTH_ASYM_TX | TB_LINK_WIDTH_ASYM_RX)) {
		if (tb_port_get_link_generation(port) < 4 ||
		    !usb4_port_asym_supported(port))
			return false;
	}

	ret = tb_port_read(port, &phy, TB_CFG_PORT,
			   port->cap_phy + LANE_ADP_CS_0, 1);
	if (ret)
		return false;

	/*
	 * The field encoding is the same as &enum tb_link_width (which is
	 * passed to @width).
	 */
	widths = FIELD_GET(LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK, phy);
	return widths & width;
}

/**
 * tb_port_set_link_width() - Set target link width of the lane adapter
 * @port: Lane adapter
 * @width: Target link width
 *
 * Sets the target link width of the lane adapter to @width. Does not
 * enable/disable lane bonding. For that call tb_port_set_lane_bonding().
 *
 * Return: %0 in case of success and negative errno in case of error
 */
int tb_port_set_link_width(struct tb_port *port, enum tb_link_width width)
{
	u32 val;
	int ret;

	if (!port->cap_phy)
		return -EINVAL;

	ret = tb_port_read(port, &val, TB_CFG_PORT,
			   port->cap_phy + LANE_ADP_CS_1, 1);
	if (ret)
		return ret;

	val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
	switch (width) {
	case TB_LINK_WIDTH_SINGLE:
		/* Gen 4 link cannot be single */
		if (tb_port_get_link_generation(port) >= 4)
			return -EOPNOTSUPP;
		val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
			LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
		break;

	case TB_LINK_WIDTH_DUAL:
		if (tb_port_get_link_generation(port) >= 4)
			return usb4_port_asym_set_link_width(port, width);
		val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
			LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
		break;

	case TB_LINK_WIDTH_ASYM_TX:
	case TB_LINK_WIDTH_ASYM_RX:
		return usb4_port_asym_set_link_width(port, width);

	default:
		return -EINVAL;
	}

	return tb_port_write(port, &val, TB_CFG_PORT,
			     port->cap_phy + LANE_ADP_CS_1, 1);
}

/**
 * tb_port_set_lane_bonding() - Enable/disable lane bonding
 * @port: Lane adapter
 * @bonding: enable/disable bonding
 *
 * Enables or disables lane bonding. This should be called after target
 * link width has been set (tb_port_set_link_width()). Note in most
 * cases one should use tb_port_lane_bonding_enable() instead to enable
 * lane bonding.
 *
 * Return: %0 in case of success and negative errno in case of error
 */
static int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)
{
	u32 val;
	int ret;

	if (!port->cap_phy)
		return -EINVAL;

	ret = tb_port_read(port, &val, TB_CFG_PORT,
			   port->cap_phy + LANE_ADP_CS_1, 1);
	if (ret)
		return ret;

	if (bonding)
		val |= LANE_ADP_CS_1_LB;
	else
		val &= ~LANE_ADP_CS_1_LB;

	return tb_port_write(port, &val, TB_CFG_PORT,
			     port->cap_phy + LANE_ADP_CS_1, 1);
}

/**
 * tb_port_lane_bonding_enable() - Enable bonding on port
 * @port: port to enable
 *
 * Enable bonding by setting the link width of the port and the other
 * port in case of dual link port. Does not wait for the link to
 * actually reach the bonded state so caller needs to call
 * tb_port_wait_for_link_width() before enabling any paths through the
 * link to make sure the link is in expected state.
 *
 * Return: %0 in case of success and negative errno in case of error
 */
int tb_port_lane_bonding_enable(struct tb_port *port)
{
	enum tb_link_width width;
	int ret;

	/*
	 * Enable lane bonding for both links if not already enabled by
	 * for example the boot firmware.
	 */
	width = tb_port_get_link_width(port);
	if (width == TB_LINK_WIDTH_SINGLE) {
		ret = tb_port_set_link_width(port, TB_LINK_WIDTH_DUAL);
		if (ret)
			goto err_lane0;
	}

	width = tb_port_get_link_width(port->dual_link_port);
	if (width == TB_LINK_WIDTH_SINGLE) {
		ret = tb_port_set_link_width(port->dual_link_port,
					     TB_LINK_WIDTH_DUAL);
		if (ret)
			goto err_lane0;
	}

	/*
	 * Only set bonding if the link was not already bonded. This
	 * avoids the lane adapter to re-enter bonding state.
	 */
	if (width == TB_LINK_WIDTH_SINGLE && !tb_is_upstream_port(port)) {
		ret = tb_port_set_lane_bonding(port, true);
		if (ret)
			goto err_lane1;
	}

	/*
	 * When lane 0 bonding is set it will affect lane 1 too so
	 * update both.
	 */
	port->bonded = true;
	port->dual_link_port->bonded = true;

	return 0;

err_lane1:
	tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);
err_lane0:
	tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);

	return ret;
}

/**
 * tb_port_lane_bonding_disable() - Disable bonding on port
 * @port: port to disable
 *
 * Disable bonding by setting the link width of the port and the
 * other port in case of dual link port.
 */
void tb_port_lane_bonding_disable(struct tb_port *port)
{
	tb_port_set_lane_bonding(port, false);
	tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);
	tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);
	port->dual_link_port->bonded = false;
	port->bonded = false;
}

/**
 * tb_port_wait_for_link_width() - Wait until link reaches specific width
 * @port: Port to wait for
 * @width: Expected link width (bitmask)
 * @timeout_msec: Timeout in ms how long to wait
 *
 * Should be used after both ends of the link have been bonded (or
 * bonding has been disabled) to wait until the link actually reaches
 * the expected state. Returns %-ETIMEDOUT if the width was not reached
 * within the given timeout, %0 if it did. Can be passed a mask of
 * expected widths and succeeds if any of the widths is reached.
 */
int tb_port_wait_for_link_width(struct tb_port *port, unsigned int width,
				int timeout_msec)
{
	ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
	int ret;

	/* Gen 4 link does not support single lane */
	if ((width & TB_LINK_WIDTH_SINGLE) &&
	    tb_port_get_link_generation(port) >= 4)
		return -EOPNOTSUPP;

	do {
		ret = tb_port_get_link_width(port);
		if (ret < 0) {
			/*
			 * Sometimes we get port locked error when
			 * polling the lanes so we can ignore it and
			 * retry.
			 */
			if (ret != -EACCES)
				return ret;
		} else if (ret & width) {
			return 0;
		}

		usleep_range(1000, 2000);
	} while (ktime_before(ktime_get(), timeout));

	return -ETIMEDOUT;
}

static int tb_port_do_update_credits(struct tb_port *port)
{
	u32 nfc_credits;
	int ret;

	ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
	if (ret)
		return ret;

	if (nfc_credits != port->config.nfc_credits) {
		u32 total;

		total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
			ADP_CS_4_TOTAL_BUFFERS_SHIFT;

		tb_port_dbg(port, "total credits changed %u -> %u\n",
			    port->total_credits, total);

		port->config.nfc_credits = nfc_credits;
		port->total_credits = total;
	}

	return 0;
}

/**
 * tb_port_update_credits() - Re-read port total credits
 * @port: Port to update
 *
 * After the link is bonded (or bonding was disabled) the port total
 * credits may change, so this function needs to be called to re-read
 * the credits. Updates also the second lane adapter.
 */
int tb_port_update_credits(struct tb_port *port)
{
	int ret;

	ret = tb_port_do_update_credits(port);
	if (ret)
		return ret;

	if (!port->dual_link_port)
		return 0;
	return tb_port_do_update_credits(port->dual_link_port);
}

static int tb_port_start_lane_initialization(struct tb_port *port)
{
	int ret;

	if (tb_switch_is_usb4(port->sw))
		return 0;

	ret = tb_lc_start_lane_initialization(port);
	return ret == -EINVAL ? 0 : ret;
}

/*
 * Returns true if the port had something (router, XDomain) connected
 * before suspend.
 */
static bool tb_port_resume(struct tb_port *port)
{
	bool has_remote = tb_port_has_remote(port);

	if (port->usb4) {
		usb4_port_device_resume(port->usb4);
	} else if (!has_remote) {
		/*
		 * For disconnected downstream lane adapters start lane
		 * initialization now so we detect future connects.
		 *
		 * For XDomain start the lane initialzation now so the
		 * link gets re-established.
		 *
		 * This is only needed for non-USB4 ports.
		 */
		if (!tb_is_upstream_port(port) || port->xdomain)
			tb_port_start_lane_initialization(port);
	}

	return has_remote || port->xdomain;
}

/**
 * tb_port_is_enabled() - Is the adapter port enabled
 * @port: Port to check
 */
bool tb_port_is_enabled(struct tb_port *port)
{
	switch (port->config.type) {
	case TB_TYPE_PCIE_UP:
	case TB_TYPE_PCIE_DOWN:
		return tb_pci_port_is_enabled(port);

	case TB_TYPE_DP_HDMI_IN:
	case TB_TYPE_DP_HDMI_OUT:
		return tb_dp_port_is_enabled(port);

	case TB_TYPE_USB3_UP:
	case TB_TYPE_USB3_DOWN:
		return tb_usb3_port_is_enabled(port);

	default:
		return false;
	}
}

/**
 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
 * @port: USB3 adapter port to check
 */
bool tb_usb3_port_is_enabled(struct tb_port *port)
{
	u32 data;

	if (tb_port_read(port, &data, TB_CFG_PORT,
			 port->cap_adap + ADP_USB3_CS_0, 1))
		return false;

	return !!(data & ADP_USB3_CS_0_PE);
}

/**
 * tb_usb3_port_enable() - Enable USB3 adapter port
 * @port: USB3 adapter port to enable
 * @enable: Enable/disable the USB3 adapter
 */
int tb_usb3_port_enable(struct tb_port *port, bool enable)
{
	u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
			  : ADP_USB3_CS_0_V;

	if (!port->cap_adap)
		return -ENXIO;
	return tb_port_write(port, &word, TB_CFG_PORT,
			     port->cap_adap + ADP_USB3_CS_0, 1);
}

/**
 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
 * @port: PCIe port to check
 */
bool tb_pci_port_is_enabled(struct tb_port *port)
{
	u32 data;

	if (tb_port_read(port, &data, TB_CFG_PORT,
			 port->cap_adap + ADP_PCIE_CS_0, 1))
		return false;

	return !!(data & ADP_PCIE_CS_0_PE);
}

/**
 * tb_pci_port_enable() - Enable PCIe adapter port
 * @port: PCIe port to enable
 * @enable: Enable/disable the PCIe adapter
 */
int tb_pci_port_enable(struct tb_port *port, bool enable)
{
	u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
	if (!port->cap_adap)
		return -ENXIO;
	return tb_port_write(port, &word, TB_CFG_PORT,
			     port->cap_adap + ADP_PCIE_CS_0, 1);
}

/**
 * tb_dp_port_hpd_is_active() - Is HPD already active
 * @port: DP out port to check
 *
 * Checks if the DP OUT adapter port has HPD bit already set.
 */
int tb_dp_port_hpd_is_active(struct tb_port *port)
{
	u32 data;
	int ret;

	ret = tb_port_read(port, &data, TB_CFG_PORT,
			   port->cap_adap + ADP_DP_CS_2, 1);
	if (ret)
		return ret;

	return !!(data & ADP_DP_CS_2_HPD);
}

/**
 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
 * @port: Port to clear HPD
 *
 * If the DP IN port has HPD set, this function can be used to clear it.
 */
int tb_dp_port_hpd_clear(struct tb_port *port)
{
	u32 data;
	int ret;

	ret = tb_port_read(port, &data, TB_CFG_PORT,
			   port->cap_adap + ADP_DP_CS_3, 1);
	if (ret)
		return ret;

	data |= ADP_DP_CS_3_HPDC;
	return tb_port_write(port, &data, TB_CFG_PORT,
			     port->cap_adap + ADP_DP_CS_3, 1);
}

/**
 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
 * @port: DP IN/OUT port to set hops
 * @video: Video Hop ID
 * @aux_tx: AUX TX Hop ID
 * @aux_rx: AUX RX Hop ID
 *
 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
 * router DP adapters too but does not program the values as the fields
 * are read-only.
 */
int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
			unsigned int aux_tx, unsigned int aux_rx)
{
	u32 data[2];
	int ret;

	if (tb_switch_is_usb4(port->sw))
		return 0;

	ret = tb_port_read(port, data, TB_CFG_PORT,
			   port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
	if (ret)
		return ret;

	data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
	data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
	data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;

	data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
		ADP_DP_CS_0_VIDEO_HOPID_MASK;
	data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
	data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
		ADP_DP_CS_1_AUX_RX_HOPID_MASK;

	return tb_port_write(port, data, TB_CFG_PORT,
			     port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
}

/**
 * tb_dp_port_is_enabled() - Is DP adapter port enabled
 * @port: DP adapter port to check
 */
bool tb_dp_port_is_enabled(struct tb_port *port)
{
	u32 data[2];

	if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
			 ARRAY_SIZE(data)))
		return false;

	return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
}

/**
 * tb_dp_port_enable() - Enables/disables DP paths of a port
 * @port: DP IN/OUT port
 * @enable: Enable/disable DP path
 *
 * Once Hop IDs are programmed DP paths can be enabled or disabled by
 * calling this function.
 */
int tb_dp_port_enable(struct tb_port *port, bool enable)
{
	u32 data[2];
	int ret;

	ret = tb_port_read(port, data, TB_CFG_PORT,
			  port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
	if (ret)
		return ret;

	if (enable)
		data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
	else
		data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);

	return tb_port_write(port, data, TB_CFG_PORT,
			     port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
}

/* switch utility functions */

static const char *tb_switch_generation_name(const struct tb_switch *sw)
{
	switch (sw->generation) {
	case 1:
		return "Thunderbolt 1";
	case 2:
		return "Thunderbolt 2";
	case 3:
		return "Thunderbolt 3";
	case 4:
		return "USB4";
	default:
		return "Unknown";
	}
}

static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
{
	const struct tb_regs_switch_header *regs = &sw->config;

	tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
	       tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
	       regs->revision, regs->thunderbolt_version);
	tb_dbg(tb, "  Max Port Number: %d\n", regs->max_port_number);
	tb_dbg(tb, "  Config:\n");
	tb_dbg(tb,
		"   Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
	       regs->upstream_port_number, regs->depth,
	       (((u64) regs->route_hi) << 32) | regs->route_lo,
	       regs->enabled, regs->plug_events_delay);
	tb_dbg(tb, "   unknown1: %#x unknown4: %#x\n",
	       regs->__unknown1, regs->__unknown4);
}

static int tb_switch_reset_host(struct tb_switch *sw)
{
	if (sw->generation > 1) {
		struct tb_port *port;

		tb_switch_for_each_port(sw, port) {
			int i, ret;

			/*
			 * For lane adapters we issue downstream port
			 * reset and clear up path config spaces.
			 *
			 * For protocol adapters we disable the path and
			 * clear path config space one by one (from 8 to
			 * Max Input HopID of the adapter).
			 */
			if (tb_port_is_null(port) && !tb_is_upstream_port(port)) {
				ret = tb_port_reset(port);
				if (ret)
					return ret;
			} else if (tb_port_is_usb3_down(port) ||
				   tb_port_is_usb3_up(port)) {
				tb_usb3_port_enable(port, false);
			} else if (tb_port_is_dpin(port) ||
				   tb_port_is_dpout(port)) {
				tb_dp_port_enable(port, false);
			} else if (tb_port_is_pcie_down(port) ||
				   tb_port_is_pcie_up(port)) {
				tb_pci_port_enable(port, false);
			} else {
				continue;
			}

			/* Cleanup path config space of protocol adapter */
			for (i = TB_PATH_MIN_HOPID;
			     i <= port->config.max_in_hop_id; i++) {
				ret = tb_path_deactivate_hop(port, i);
				if (ret)
					return ret;
			}
		}
	} else {
		struct tb_cfg_result res;

		/* Thunderbolt 1 uses the "reset" config space packet */
		res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
				      TB_CFG_SWITCH, 2, 2);
		if (res.err)
			return res.err;
		res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));
		if (res.err > 0)
			return -EIO;
		else if (res.err < 0)
			return res.err;
	}

	return 0;
}

static int tb_switch_reset_device(struct tb_switch *sw)
{
	return tb_port_reset(tb_switch_downstream_port(sw));
}

static bool tb_switch_enumerated(struct tb_switch *sw)
{
	u32 val;
	int ret;

	/*
	 * Read directly from the hardware because we use this also
	 * during system sleep where sw->config.enabled is already set
	 * by us.
	 */
	ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_3, 1);
	if (ret)
		return false;

	return !!(val & ROUTER_CS_3_V);
}

/**
 * tb_switch_reset() - Perform reset to the router
 * @sw: Router to reset
 *
 * Issues reset to the router @sw. Can be used for any router. For host
 * routers, resets all the downstream ports and cleans up path config
 * spaces accordingly. For device routers issues downstream port reset
 * through the parent router, so as side effect there will be unplug
 * soon after this is finished.
 *
 * If the router is not enumerated does nothing.
 *
 * Returns %0 on success or negative errno in case of failure.
 */
int tb_switch_reset(struct tb_switch *sw)
{
	int ret;

	/*
	 * We cannot access the port config spaces unless the router is
	 * already enumerated. If the router is not enumerated it is
	 * equal to being reset so we can skip that here.
	 */
	if (!tb_switch_enumerated(sw))
		return 0;

	tb_sw_dbg(sw, "resetting\n");

	if (tb_route(sw))
		ret = tb_switch_reset_device(sw);
	else
		ret = tb_switch_reset_host(sw);

	if (ret)
		tb_sw_warn(sw, "failed to reset\n");

	return ret;
}

/**
 * tb_switch_wait_for_bit() - Wait for specified value of bits in offset
 * @sw: Router to read the offset value from
 * @offset: Offset in the router config space to read from
 * @bit: Bit mask in the offset to wait for
 * @value: Value of the bits to wait for
 * @timeout_msec: Timeout in ms how long to wait
 *
 * Wait till the specified bits in specified offset reach specified value.
 * Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached
 * within the given timeout or a negative errno in case of failure.
 */
int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
			   u32 value, int timeout_msec)
{
	ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);

	do {
		u32 val;
		int ret;

		ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
		if (ret)
			return ret;

		if ((val & bit) == value)
			return 0;

		usleep_range(50, 100);
	} while (ktime_before(ktime_get(), timeout));

	return -ETIMEDOUT;
}

/*
 * tb_plug_events_active() - enable/disable plug events on a switch
 *
 * Also configures a sane plug_events_delay of 255ms.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
static int tb_plug_events_active(struct tb_switch *sw, bool active)
{
	u32 data;
	int res;

	if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
		return 0;

	sw->config.plug_events_delay = 0xff;
	res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
	if (res)
		return res;

	res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
	if (res)
		return res;

	if (active) {
		data = data & 0xFFFFFF83;
		switch (sw->config.device_id) {
		case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
		case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
		case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
			break;
		default:
			/*
			 * Skip Alpine Ridge, it needs to have vendor
			 * specific USB hotplug event enabled for the
			 * internal xHCI to work.
			 */
			if (!tb_switch_is_alpine_ridge(sw))
				data |= TB_PLUG_EVENTS_USB_DISABLE;
		}
	} else {
		data = data | 0x7c;
	}
	return tb_sw_write(sw, &data, TB_CFG_SWITCH,
			   sw->cap_plug_events + 1, 1);
}

static ssize_t authorized_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%u\n", sw->authorized);
}

static int disapprove_switch(struct device *dev, void *not_used)
{
	char *envp[] = { "AUTHORIZED=0", NULL };
	struct tb_switch *sw;

	sw = tb_to_switch(dev);
	if (sw && sw->authorized) {
		int ret;

		/* First children */
		ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
		if (ret)
			return ret;

		ret = tb_domain_disapprove_switch(sw->tb, sw);
		if (ret)
			return ret;

		sw->authorized = 0;
		kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
	}

	return 0;
}

static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
{
	char envp_string[13];
	int ret = -EINVAL;
	char *envp[] = { envp_string, NULL };

	if (!mutex_trylock(&sw->tb->lock))
		return restart_syscall();

	if (!!sw->authorized == !!val)
		goto unlock;

	switch (val) {
	/* Disapprove switch */
	case 0:
		if (tb_route(sw)) {
			ret = disapprove_switch(&sw->dev, NULL);
			goto unlock;
		}
		break;

	/* Approve switch */
	case 1:
		if (sw->key)
			ret = tb_domain_approve_switch_key(sw->tb, sw);
		else
			ret = tb_domain_approve_switch(sw->tb, sw);
		break;

	/* Challenge switch */
	case 2:
		if (sw->key)
			ret = tb_domain_challenge_switch_key(sw->tb, sw);
		break;

	default:
		break;
	}

	if (!ret) {
		sw->authorized = val;
		/*
		 * Notify status change to the userspace, informing the new
		 * value of /sys/bus/thunderbolt/devices/.../authorized.
		 */
		sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);
		kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
	}

unlock:
	mutex_unlock(&sw->tb->lock);
	return ret;
}

static ssize_t authorized_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct tb_switch *sw = tb_to_switch(dev);
	unsigned int val;
	ssize_t ret;

	ret = kstrtouint(buf, 0, &val);
	if (ret)
		return ret;
	if (val > 2)
		return -EINVAL;

	pm_runtime_get_sync(&sw->dev);
	ret = tb_switch_set_authorized(sw, val);
	pm_runtime_mark_last_busy(&sw->dev);
	pm_runtime_put_autosuspend(&sw->dev);

	return ret ? ret : count;
}
static DEVICE_ATTR_RW(authorized);

static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%u\n", sw->boot);
}
static DEVICE_ATTR_RO(boot);

static ssize_t device_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%#x\n", sw->device);
}
static DEVICE_ATTR_RO(device);

static ssize_t
device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%s\n", sw->device_name ?: "");
}
static DEVICE_ATTR_RO(device_name);

static ssize_t
generation_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%u\n", sw->generation);
}
static DEVICE_ATTR_RO(generation);

static ssize_t key_show(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	ssize_t ret;

	if (!mutex_trylock(&sw->tb->lock))
		return restart_syscall();

	if (sw->key)
		ret = sysfs_emit(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
	else
		ret = sysfs_emit(buf, "\n");

	mutex_unlock(&sw->tb->lock);
	return ret;
}

static ssize_t key_store(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	struct tb_switch *sw = tb_to_switch(dev);
	u8 key[TB_SWITCH_KEY_SIZE];
	ssize_t ret = count;
	bool clear = false;

	if (!strcmp(buf, "\n"))
		clear = true;
	else if (hex2bin(key, buf, sizeof(key)))
		return -EINVAL;

	if (!mutex_trylock(&sw->tb->lock))
		return restart_syscall();

	if (sw->authorized) {
		ret = -EBUSY;
	} else {
		kfree(sw->key);
		if (clear) {
			sw->key = NULL;
		} else {
			sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
			if (!sw->key)
				ret = -ENOMEM;
		}
	}

	mutex_unlock(&sw->tb->lock);
	return ret;
}
static DEVICE_ATTR(key, 0600, key_show, key_store);

static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%u.0 Gb/s\n", sw->link_speed);
}

/*
 * Currently all lanes must run at the same speed but we expose here
 * both directions to allow possible asymmetric links in the future.
 */
static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);

static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	unsigned int width;

	switch (sw->link_width) {
	case TB_LINK_WIDTH_SINGLE:
	case TB_LINK_WIDTH_ASYM_TX:
		width = 1;
		break;
	case TB_LINK_WIDTH_DUAL:
		width = 2;
		break;
	case TB_LINK_WIDTH_ASYM_RX:
		width = 3;
		break;
	default:
		WARN_ON_ONCE(1);
		return -EINVAL;
	}

	return sysfs_emit(buf, "%u\n", width);
}
static DEVICE_ATTR(rx_lanes, 0444, rx_lanes_show, NULL);

static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	unsigned int width;

	switch (sw->link_width) {
	case TB_LINK_WIDTH_SINGLE:
	case TB_LINK_WIDTH_ASYM_RX:
		width = 1;
		break;
	case TB_LINK_WIDTH_DUAL:
		width = 2;
		break;
	case TB_LINK_WIDTH_ASYM_TX:
		width = 3;
		break;
	default:
		WARN_ON_ONCE(1);
		return -EINVAL;
	}

	return sysfs_emit(buf, "%u\n", width);
}
static DEVICE_ATTR(tx_lanes, 0444, tx_lanes_show, NULL);

static ssize_t nvm_authenticate_show(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	u32 status;

	nvm_get_auth_status(sw, &status);
	return sysfs_emit(buf, "%#x\n", status);
}

static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
				      bool disconnect)
{
	struct tb_switch *sw = tb_to_switch(dev);
	int val, ret;

	pm_runtime_get_sync(&sw->dev);

	if (!mutex_trylock(&sw->tb->lock)) {
		ret = restart_syscall();
		goto exit_rpm;
	}

	if (sw->no_nvm_upgrade) {
		ret = -EOPNOTSUPP;
		goto exit_unlock;
	}

	/* If NVMem devices are not yet added */
	if (!sw->nvm) {
		ret = -EAGAIN;
		goto exit_unlock;
	}

	ret = kstrtoint(buf, 10, &val);
	if (ret)
		goto exit_unlock;

	/* Always clear the authentication status */
	nvm_clear_auth_status(sw);

	if (val > 0) {
		if (val == AUTHENTICATE_ONLY) {
			if (disconnect)
				ret = -EINVAL;
			else
				ret = nvm_authenticate(sw, true);
		} else {
			if (!sw->nvm->flushed) {
				if (!sw->nvm->buf) {
					ret = -EINVAL;
					goto exit_unlock;
				}

				ret = nvm_validate_and_write(sw);
				if (ret || val == WRITE_ONLY)
					goto exit_unlock;
			}
			if (val == WRITE_AND_AUTHENTICATE) {
				if (disconnect)
					ret = tb_lc_force_power(sw);
				else
					ret = nvm_authenticate(sw, false);
			}
		}
	}

exit_unlock:
	mutex_unlock(&sw->tb->lock);
exit_rpm:
	pm_runtime_mark_last_busy(&sw->dev);
	pm_runtime_put_autosuspend(&sw->dev);

	return ret;
}

static ssize_t nvm_authenticate_store(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	int ret = nvm_authenticate_sysfs(dev, buf, false);
	if (ret)
		return ret;
	return count;
}
static DEVICE_ATTR_RW(nvm_authenticate);

static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	return nvm_authenticate_show(dev, attr, buf);
}

static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	int ret;

	ret = nvm_authenticate_sysfs(dev, buf, true);
	return ret ? ret : count;
}
static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);

static ssize_t nvm_version_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);
	int ret;

	if (!mutex_trylock(&sw->tb->lock))
		return restart_syscall();

	if (sw->safe_mode)
		ret = -ENODATA;
	else if (!sw->nvm)
		ret = -EAGAIN;
	else
		ret = sysfs_emit(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);

	mutex_unlock(&sw->tb->lock);

	return ret;
}
static DEVICE_ATTR_RO(nvm_version);

static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%#x\n", sw->vendor);
}
static DEVICE_ATTR_RO(vendor);

static ssize_t
vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%s\n", sw->vendor_name ?: "");
}
static DEVICE_ATTR_RO(vendor_name);

static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
			      char *buf)
{
	struct tb_switch *sw = tb_to_switch(dev);

	return sysfs_emit(buf, "%pUb\n", sw->uuid);
}
static DEVICE_ATTR_RO(unique_id);

static struct attribute *switch_attrs[] = {
	&dev_attr_authorized.attr,
	&dev_attr_boot.attr,
	&dev_attr_device.attr,
	&dev_attr_device_name.attr,
	&dev_attr_generation.attr,
	&dev_attr_key.attr,
	&dev_attr_nvm_authenticate.attr,
	&dev_attr_nvm_authenticate_on_disconnect.attr,
	&dev_attr_nvm_version.attr,
	&dev_attr_rx_speed.attr,
	&dev_attr_rx_lanes.attr,
	&dev_attr_tx_speed.attr,
	&dev_attr_tx_lanes.attr,
	&dev_attr_vendor.attr,
	&dev_attr_vendor_name.attr,
	&dev_attr_unique_id.attr,
	NULL,
};

static umode_t switch_attr_is_visible(struct kobject *kobj,
				      struct attribute *attr, int n)
{
	struct device *dev = kobj_to_dev(kobj);
	struct tb_switch *sw = tb_to_switch(dev);

	if (attr == &dev_attr_authorized.attr) {
		if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
		    sw->tb->security_level == TB_SECURITY_DPONLY)
			return 0;
	} else if (attr == &dev_attr_device.attr) {
		if (!sw->device)
			return 0;
	} else if (attr == &dev_attr_device_name.attr) {
		if (!sw->device_name)
			return 0;
	} else if (attr == &dev_attr_vendor.attr)  {
		if (!sw->vendor)
			return 0;
	} else if (attr == &dev_attr_vendor_name.attr)  {
		if (!sw->vendor_name)
			return 0;
	} else if (attr == &dev_attr_key.attr) {
		if (tb_route(sw) &&
		    sw->tb->security_level == TB_SECURITY_SECURE &&
		    sw->security_level == TB_SECURITY_SECURE)
			return attr->mode;
		return 0;
	} else if (attr == &dev_attr_rx_speed.attr ||
		   attr == &dev_attr_rx_lanes.attr ||
		   attr == &dev_attr_tx_speed.attr ||
		   attr == &dev_attr_tx_lanes.attr) {
		if (tb_route(sw))
			return attr->mode;
		return 0;
	} else if (attr == &dev_attr_nvm_authenticate.attr) {
		if (nvm_upgradeable(sw))
			return attr->mode;
		return 0;
	} else if (attr == &dev_attr_nvm_version.attr) {
		if (nvm_readable(sw))
			return attr->mode;
		return 0;
	} else if (attr == &dev_attr_boot.attr) {
		if (tb_route(sw))
			return attr->mode;
		return 0;
	} else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
		if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
			return attr->mode;
		return 0;
	}

	return sw->safe_mode ? 0 : attr->mode;
}

static const struct attribute_group switch_group = {
	.is_visible = switch_attr_is_visible,
	.attrs = switch_attrs,
};

static const struct attribute_group *switch_groups[] = {
	&switch_group,
	NULL,
};

static void tb_switch_release(struct device *dev)
{
	struct tb_switch *sw = tb_to_switch(dev);
	struct tb_port *port;

	dma_port_free(sw->dma_port);

	tb_switch_for_each_port(sw, port) {
		ida_destroy(&port->in_hopids);
		ida_destroy(&port->out_hopids);
	}

	kfree(sw->uuid);
	kfree(sw->device_name);
	kfree(sw->vendor_name);
	kfree(sw->ports);
	kfree(sw->drom);
	kfree(sw->key);
	kfree(sw);
}

static int tb_switch_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
	const struct tb_switch *sw = tb_to_switch(dev);
	const char *type;

	if (tb_switch_is_usb4(sw)) {
		if (add_uevent_var(env, "USB4_VERSION=%u.0",
				   usb4_switch_version(sw)))
			return -ENOMEM;
	}

	if (!tb_route(sw)) {
		type = "host";
	} else {
		const struct tb_port *port;
		bool hub = false;

		/* Device is hub if it has any downstream ports */
		tb_switch_for_each_port(sw, port) {
			if (!port->disabled && !tb_is_upstream_port(port) &&
			     tb_port_is_null(port)) {
				hub = true;
				break;
			}
		}

		type = hub ? "hub" : "device";
	}

	if (add_uevent_var(env, "USB4_TYPE=%s", type))
		return -ENOMEM;
	return 0;
}

/*
 * Currently only need to provide the callbacks. Everything else is handled
 * in the connection manager.
 */
static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
{
	struct tb_switch *sw = tb_to_switch(dev);
	const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;

	if (cm_ops->runtime_suspend_switch)
		return cm_ops->runtime_suspend_switch(sw);

	return 0;
}

static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
{
	struct tb_switch *sw = tb_to_switch(dev);
	const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;

	if (cm_ops->runtime_resume_switch)
		return cm_ops->runtime_resume_switch(sw);
	return 0;
}

static const struct dev_pm_ops tb_switch_pm_ops = {
	SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
			   NULL)
};

struct device_type tb_switch_type = {
	.name = "thunderbolt_device",
	.release = tb_switch_release,
	.uevent = tb_switch_uevent,
	.pm = &tb_switch_pm_ops,
};

static int tb_switch_get_generation(struct tb_switch *sw)
{
	if (tb_switch_is_usb4(sw))
		return 4;

	if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
		switch (sw->config.device_id) {
		case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
		case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
		case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
		case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
		case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
		case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
		case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
			return 1;

		case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
			return 2;

		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
		case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
		case PCI_DEVICE_ID_INTEL_ICL_NHI0:
		case PCI_DEVICE_ID_INTEL_ICL_NHI1:
			return 3;
		}
	}

	/*
	 * For unknown switches assume generation to be 1 to be on the
	 * safe side.
	 */
	tb_sw_warn(sw, "unsupported switch device id %#x\n",
		   sw->config.device_id);
	return 1;
}

static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
{
	int max_depth;

	if (tb_switch_is_usb4(sw) ||
	    (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
		max_depth = USB4_SWITCH_MAX_DEPTH;
	else
		max_depth = TB_SWITCH_MAX_DEPTH;

	return depth > max_depth;
}

/**
 * tb_switch_alloc() - allocate a switch
 * @tb: Pointer to the owning domain
 * @parent: Parent device for this switch
 * @route: Route string for this switch
 *
 * Allocates and initializes a switch. Will not upload configuration to
 * the switch. For that you need to call tb_switch_configure()
 * separately. The returned switch should be released by calling
 * tb_switch_put().
 *
 * Return: Pointer to the allocated switch or ERR_PTR() in case of
 * failure.
 */
struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
				  u64 route)
{
	struct tb_switch *sw;
	int upstream_port;
	int i, ret, depth;

	/* Unlock the downstream port so we can access the switch below */
	if (route) {
		struct tb_switch *parent_sw = tb_to_switch(parent);
		struct tb_port *down;

		down = tb_port_at(route, parent_sw);
		tb_port_unlock(down);
	}

	depth = tb_route_length(route);

	upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
	if (upstream_port < 0)
		return ERR_PTR(upstream_port);

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

	sw->tb = tb;
	ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
	if (ret)
		goto err_free_sw_ports;

	sw->generation = tb_switch_get_generation(sw);

	tb_dbg(tb, "current switch config:\n");
	tb_dump_switch(tb, sw);

	/* configure switch */
	sw->config.upstream_port_number = upstream_port;
	sw->config.depth = depth;
	sw->config.route_hi = upper_32_bits(route);
	sw->config.route_lo = lower_32_bits(route);
	sw->config.enabled = 0;

	/* Make sure we do not exceed maximum topology limit */
	if (tb_switch_exceeds_max_depth(sw, depth)) {
		ret = -EADDRNOTAVAIL;
		goto err_free_sw_ports;
	}

	/* initialize ports */
	sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
				GFP_KERNEL);
	if (!sw->ports) {
		ret = -ENOMEM;
		goto err_free_sw_ports;
	}

	for (i = 0; i <= sw->config.max_port_number; i++) {
		/* minimum setup for tb_find_cap and tb_drom_read to work */
		sw->ports[i].sw = sw;
		sw->ports[i].port = i;

		/* Control port does not need HopID allocation */
		if (i) {
			ida_init(&sw->ports[i].in_hopids);
			ida_init(&sw->ports[i].out_hopids);
		}
	}

	ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
	if (ret > 0)
		sw->cap_plug_events = ret;

	ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);
	if (ret > 0)
		sw->cap_vsec_tmu = ret;

	ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
	if (ret > 0)
		sw->cap_lc = ret;

	ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);
	if (ret > 0)
		sw->cap_lp = ret;

	/* Root switch is always authorized */
	if (!route)
		sw->authorized = true;

	device_initialize(&sw->dev);
	sw->dev.parent = parent;
	sw->dev.bus = &tb_bus_type;
	sw->dev.type = &tb_switch_type;
	sw->dev.groups = switch_groups;
	dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));

	return sw;

err_free_sw_ports:
	kfree(sw->ports);
	kfree(sw);

	return ERR_PTR(ret);
}

/**
 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
 * @tb: Pointer to the owning domain
 * @parent: Parent device for this switch
 * @route: Route string for this switch
 *
 * This creates a switch in safe mode. This means the switch pretty much
 * lacks all capabilities except DMA configuration port before it is
 * flashed with a valid NVM firmware.
 *
 * The returned switch must be released by calling tb_switch_put().
 *
 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
 */
struct tb_switch *
tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
{
	struct tb_switch *sw;

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

	sw->tb = tb;
	sw->config.depth = tb_route_length(route);
	sw->config.route_hi = upper_32_bits(route);
	sw->config.route_lo = lower_32_bits(route);
	sw->safe_mode = true;

	device_initialize(&sw->dev);
	sw->dev.parent = parent;
	sw->dev.bus = &tb_bus_type;
	sw->dev.type = &tb_switch_type;
	sw->dev.groups = switch_groups;
	dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));

	return sw;
}

/**
 * tb_switch_configure() - Uploads configuration to the switch
 * @sw: Switch to configure
 *
 * Call this function before the switch is added to the system. It will
 * upload configuration to the switch and makes it available for the
 * connection manager to use. Can be called to the switch again after
 * resume from low power states to re-initialize it.
 *
 * Return: %0 in case of success and negative errno in case of failure
 */
int tb_switch_configure(struct tb_switch *sw)
{
	struct tb *tb = sw->tb;
	u64 route;
	int ret;

	route = tb_route(sw);

	tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
	       sw->config.enabled ? "restoring" : "initializing", route,
	       tb_route_length(route), sw->config.upstream_port_number);

	sw->config.enabled = 1;

	if (tb_switch_is_usb4(sw)) {
		/*
		 * For USB4 devices, we need to program the CM version
		 * accordingly so that it knows to expose all the
		 * additional capabilities. Program it according to USB4
		 * version to avoid changing existing (v1) routers behaviour.
		 */
		if (usb4_switch_version(sw) < 2)
			sw->config.cmuv = ROUTER_CS_4_CMUV_V1;
		else
			sw->config.cmuv = ROUTER_CS_4_CMUV_V2;
		sw->config.plug_events_delay = 0xa;

		/* Enumerate the switch */
		ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
				  ROUTER_CS_1, 4);
		if (ret)
			return ret;

		ret = usb4_switch_setup(sw);
	} else {
		if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
			tb_sw_warn(sw, "unknown switch vendor id %#x\n",
				   sw->config.vendor_id);

		if (!sw->cap_plug_events) {
			tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
			return -ENODEV;
		}

		/* Enumerate the switch */
		ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
				  ROUTER_CS_1, 3);
	}
	if (ret)
		return ret;

	return tb_plug_events_active(sw, true);
}

/**
 * tb_switch_configuration_valid() - Set the tunneling configuration to be valid
 * @sw: Router to configure
 *
 * Needs to be called before any tunnels can be setup through the
 * router. Can be called to any router.
 *
 * Returns %0 in success and negative errno otherwise.
 */
int tb_switch_configuration_valid(struct tb_switch *sw)
{
	if (tb_switch_is_usb4(sw))
		return usb4_switch_configuration_valid(sw);
	return 0;
}

static int tb_switch_set_uuid(struct tb_switch *sw)
{
	bool uid = false;
	u32 uuid[4];
	int ret;

	if (sw->uuid)
		return 0;

	if (tb_switch_is_usb4(sw)) {
		ret = usb4_switch_read_uid(sw, &sw->uid);
		if (ret)
			return ret;
		uid = true;
	} else {
		/*
		 * The newer controllers include fused UUID as part of
		 * link controller specific registers
		 */
		ret = tb_lc_read_uuid(sw, uuid);
		if (ret) {
			if (ret != -EINVAL)
				return ret;
			uid = true;
		}
	}

	if (uid) {
		/*
		 * ICM generates UUID based on UID and fills the upper
		 * two words with ones. This is not strictly following
		 * UUID format but we want to be compatible with it so
		 * we do the same here.
		 */
		uuid[0] = sw->uid & 0xffffffff;
		uuid[1] = (sw->uid >> 32) & 0xffffffff;
		uuid[2] = 0xffffffff;
		uuid[3] = 0xffffffff;
	}

	sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
	if (!sw->uuid)
		return -ENOMEM;
	return 0;
}

static int tb_switch_add_dma_port(struct tb_switch *sw)
{
	u32 status;
	int ret;

	switch (sw->generation) {
	case 2:
		/* Only root switch can be upgraded */
		if (tb_route(sw))
			return 0;

		fallthrough;
	case 3:
	case 4:
		ret = tb_switch_set_uuid(sw);
		if (ret)
			return ret;
		break;

	default:
		/*
		 * DMA port is the only thing available when the switch
		 * is in safe mode.
		 */
		if (!sw->safe_mode)
			return 0;
		break;
	}

	if (sw->no_nvm_upgrade)
		return 0;

	if (tb_switch_is_usb4(sw)) {
		ret = usb4_switch_nvm_authenticate_status(sw, &status);
		if (ret)
			return ret;

		if (status) {
			tb_sw_info(sw, "switch flash authentication failed\n");
			nvm_set_auth_status(sw, status);
		}

		return 0;
	}

	/* Root switch DMA port requires running firmware */
	if (!tb_route(sw) && !tb_switch_is_icm(sw))
		return 0;

	sw->dma_port = dma_port_alloc(sw);
	if (!sw->dma_port)
		return 0;

	/*
	 * If there is status already set then authentication failed
	 * when the dma_port_flash_update_auth() returned. Power cycling
	 * is not needed (it was done already) so only thing we do here
	 * is to unblock runtime PM of the root port.
	 */
	nvm_get_auth_status(sw, &status);
	if (status) {
		if (!tb_route(sw))
			nvm_authenticate_complete_dma_port(sw);
		return 0;
	}

	/*
	 * Check status of the previous flash authentication. If there
	 * is one we need to power cycle the switch in any case to make
	 * it functional again.
	 */
	ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
	if (ret <= 0)
		return ret;

	/* Now we can allow root port to suspend again */
	if (!tb_route(sw))
		nvm_authenticate_complete_dma_port(sw);

	if (status) {
		tb_sw_info(sw, "switch flash authentication failed\n");
		nvm_set_auth_status(sw, status);
	}

	tb_sw_info(sw, "power cycling the switch now\n");
	dma_port_power_cycle(sw->dma_port);

	/*
	 * We return error here which causes the switch adding failure.
	 * It should appear back after power cycle is complete.
	 */
	return -ESHUTDOWN;
}

static void tb_switch_default_link_ports(struct tb_switch *sw)
{
	int i;

	for (i = 1; i <= sw->config.max_port_number; i++) {
		struct tb_port *port = &sw->ports[i];
		struct tb_port *subordinate;

		if (!tb_port_is_null(port))
			continue;

		/* Check for the subordinate port */
		if (i == sw->config.max_port_number ||
		    !tb_port_is_null(&sw->ports[i + 1]))
			continue;

		/* Link them if not already done so (by DROM) */
		subordinate = &sw->ports[i + 1];
		if (!port->dual_link_port && !subordinate->dual_link_port) {
			port->link_nr = 0;
			port->dual_link_port = subordinate;
			subordinate->link_nr = 1;
			subordinate->dual_link_port = port;

			tb_sw_dbg(sw, "linked ports %d <-> %d\n",
				  port->port, subordinate->port);
		}
	}
}

static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
{
	const struct tb_port *up = tb_upstream_port(sw);

	if (!up->dual_link_port || !up->dual_link_port->remote)
		return false;

	if (tb_switch_is_usb4(sw))
		return usb4_switch_lane_bonding_possible(sw);
	return tb_lc_lane_bonding_possible(sw);
}

static int tb_switch_update_link_attributes(struct tb_switch *sw)
{
	struct tb_port *up;
	bool change = false;
	int ret;

	if (!tb_route(sw) || tb_switch_is_icm(sw))
		return 0;

	up = tb_upstream_port(sw);

	ret = tb_port_get_link_speed(up);
	if (ret < 0)
		return ret;
	if (sw->link_speed != ret)
		change = true;
	sw->link_speed = ret;

	ret = tb_port_get_link_width(up);
	if (ret < 0)
		return ret;
	if (sw->link_width != ret)
		change = true;
	sw->link_width = ret;

	/* Notify userspace that there is possible link attribute change */
	if (device_is_registered(&sw->dev) && change)
		kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);

	return 0;
}

/* Must be called after tb_switch_update_link_attributes() */
static void tb_switch_link_init(struct tb_switch *sw)
{
	struct tb_port *up, *down;
	bool bonded;

	if (!tb_route(sw) || tb_switch_is_icm(sw))
		return;

	tb_sw_dbg(sw, "current link speed %u.0 Gb/s\n", sw->link_speed);
	tb_sw_dbg(sw, "current link width %s\n", tb_width_name(sw->link_width));

	bonded = sw->link_width >= TB_LINK_WIDTH_DUAL;

	/*
	 * Gen 4 links come up as bonded so update the port structures
	 * accordingly.
	 */
	up = tb_upstream_port(sw);
	down = tb_switch_downstream_port(sw);

	up->bonded = bonded;
	if (up->dual_link_port)
		up->dual_link_port->bonded = bonded;
	tb_port_update_credits(up);

	down->bonded = bonded;
	if (down->dual_link_port)
		down->dual_link_port->bonded = bonded;
	tb_port_update_credits(down);

	if (tb_port_get_link_generation(up) < 4)
		return;

	/*
	 * Set the Gen 4 preferred link width. This is what the router
	 * prefers when the link is brought up. If the router does not
	 * support asymmetric link configuration, this also will be set
	 * to TB_LINK_WIDTH_DUAL.
	 */
	sw->preferred_link_width = sw->link_width;
	tb_sw_dbg(sw, "preferred link width %s\n",
		  tb_width_name(sw->preferred_link_width));
}

/**
 * tb_switch_lane_bonding_enable() - Enable lane bonding
 * @sw: Switch to enable lane bonding
 *
 * Connection manager can call this function to enable lane bonding of a
 * switch. If conditions are correct and both switches support the feature,
 * lanes are bonded. It is safe to call this to any switch.
 */
static int tb_switch_lane_bonding_enable(struct tb_switch *sw)
{
	struct tb_port *up, *down;
	unsigned int width;
	int ret;

	if (!tb_switch_lane_bonding_possible(sw))
		return 0;

	up = tb_upstream_port(sw);
	down = tb_switch_downstream_port(sw);

	if (!tb_port_width_supported(up, TB_LINK_WIDTH_DUAL) ||
	    !tb_port_width_supported(down, TB_LINK_WIDTH_DUAL))
		return 0;

	/*
	 * Both lanes need to be in CL0. Here we assume lane 0 already be in
	 * CL0 and check just for lane 1.
	 */
	if (tb_wait_for_port(down->dual_link_port, false) <= 0)
		return -ENOTCONN;

	ret = tb_port_lane_bonding_enable(up);
	if (ret) {
		tb_port_warn(up, "failed to enable lane bonding\n");
		return ret;
	}

	ret = tb_port_lane_bonding_enable(down);
	if (ret) {
		tb_port_warn(down, "failed to enable lane bonding\n");
		tb_port_lane_bonding_disable(up);
		return ret;
	}

	/* Any of the widths are all bonded */
	width = TB_LINK_WIDTH_DUAL | TB_LINK_WIDTH_ASYM_TX |
		TB_LINK_WIDTH_ASYM_RX;

	return tb_port_wait_for_link_width(down, width, 100);
}

/**
 * tb_switch_lane_bonding_disable() - Disable lane bonding
 * @sw: Switch whose lane bonding to disable
 *
 * Disables lane bonding between @sw and parent. This can be called even
 * if lanes were not bonded originally.
 */
static int tb_switch_lane_bonding_disable(struct tb_switch *sw)
{
	struct tb_port *up, *down;
	int ret;

	up = tb_upstream_port(sw);
	if (!up->bonded)
		return 0;

	/*
	 * If the link is Gen 4 there is no way to switch the link to
	 * two single lane links so avoid that here. Also don't bother
	 * if the link is not up anymore (sw is unplugged).
	 */
	ret = tb_port_get_link_generation(up);
	if (ret < 0)
		return ret;
	if (ret >= 4)
		return -EOPNOTSUPP;

	down = tb_switch_downstream_port(sw);
	tb_port_lane_bonding_disable(up);
	tb_port_lane_bonding_disable(down);

	/*
	 * It is fine if we get other errors as the router might have
	 * been unplugged.
	 */
	return tb_port_wait_for_link_width(down, TB_LINK_WIDTH_SINGLE, 100);
}

/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
static int tb_switch_asym_enable(struct tb_switch *sw, enum tb_link_width width)
{
	struct tb_port *up, *down, *port;
	enum tb_link_width down_width;
	int ret;

	up = tb_upstream_port(sw);
	down = tb_switch_downstream_port(sw);

	if (width == TB_LINK_WIDTH_ASYM_TX) {
		down_width = TB_LINK_WIDTH_ASYM_RX;
		port = down;
	} else {
		down_width = TB_LINK_WIDTH_ASYM_TX;
		port = up;
	}

	ret = tb_port_set_link_width(up, width);
	if (ret)
		return ret;

	ret = tb_port_set_link_width(down, down_width);
	if (ret)
		return ret;

	/*
	 * Initiate the change in the router that one of its TX lanes is
	 * changing to RX but do so only if there is an actual change.
	 */
	if (sw->link_width != width) {
		ret = usb4_port_asym_start(port);
		if (ret)
			return ret;

		ret = tb_port_wait_for_link_width(up, width, 100);
		if (ret)
			return ret;
	}

	return 0;
}

/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
static int tb_switch_asym_disable(struct tb_switch *sw)
{
	struct tb_port *up, *down;
	int ret;

	up = tb_upstream_port(sw);
	down = tb_switch_downstream_port(sw);

	ret = tb_port_set_link_width(up, TB_LINK_WIDTH_DUAL);
	if (ret)
		return ret;

	ret = tb_port_set_link_width(down, TB_LINK_WIDTH_DUAL);
	if (ret)
		return ret;

	/*
	 * Initiate the change in the router that has three TX lanes and
	 * is changing one of its TX lanes to RX but only if there is a
	 * change in the link width.
	 */
	if (sw->link_width > TB_LINK_WIDTH_DUAL) {
		if (sw->link_width == TB_LINK_WIDTH_ASYM_TX)
			ret = usb4_port_asym_start(up);
		else
			ret = usb4_port_asym_start(down);
		if (ret)
			return ret;

		ret = tb_port_wait_for_link_width(up, TB_LINK_WIDTH_DUAL, 100);
		if (ret)
			return ret;
	}

	return 0;
}

/**
 * tb_switch_set_link_width() - Configure router link width
 * @sw: Router to configure
 * @width: The new link width
 *
 * Set device router link width to @width from router upstream port
 * perspective. Supports also asymmetric links if the routers boths side
 * of the link supports it.
 *
 * Does nothing for host router.
 *
 * Returns %0 in case of success, negative errno otherwise.
 */
int tb_switch_set_link_width(struct tb_switch *sw, enum tb_link_width width)
{
	struct tb_port *up, *down;
	int ret = 0;

	if (!tb_route(sw))
		return 0;

	up = tb_upstream_port(sw);
	down = tb_switch_downstream_port(sw);

	switch (width) {
	case TB_LINK_WIDTH_SINGLE:
		ret = tb_switch_lane_bonding_disable(sw);
		break;

	case TB_LINK_WIDTH_DUAL:
		if (sw->link_width == TB_LINK_WIDTH_ASYM_TX ||
		    sw->link_width == TB_LINK_WIDTH_ASYM_RX) {
			ret = tb_switch_asym_disable(sw);
			if (ret)
				break;
		}
		ret = tb_switch_lane_bonding_enable(sw);
		break;

	case TB_LINK_WIDTH_ASYM_TX:
	case TB_LINK_WIDTH_ASYM_RX:
		ret = tb_switch_asym_enable(sw, width);
		break;
	}

	switch (ret) {
	case 0:
		break;

	case -ETIMEDOUT:
		tb_sw_warn(sw, "timeout changing link width\n");
		return ret;

	case -ENOTCONN:
	case -EOPNOTSUPP:
	case -ENODEV:
		return ret;

	default:
		tb_sw_dbg(sw, "failed to change link width: %d\n", ret);
		return ret;
	}

	tb_port_update_credits(down);
	tb_port_update_credits(up);

	tb_switch_update_link_attributes(sw);

	tb_sw_dbg(sw, "link width set to %s\n", tb_width_name(width));
	return ret;
}

/**
 * tb_switch_configure_link() - Set link configured
 * @sw: Switch whose link is configured
 *
 * Sets the link upstream from @sw configured (from both ends) so that
 * it will not be disconnected when the domain exits sleep. Can be
 * called for any switch.
 *
 * It is recommended that this is called after lane bonding is enabled.
 *
 * Returns %0 on success and negative errno in case of error.
 */
int tb_switch_configure_link(struct tb_switch *sw)
{
	struct tb_port *up, *down;
	int ret;

	if (!tb_route(sw) || tb_switch_is_icm(sw))
		return 0;

	up = tb_upstream_port(sw);
	if (tb_switch_is_usb4(up->sw))
		ret = usb4_port_configure(up);
	else
		ret = tb_lc_configure_port(up);
	if (ret)
		return ret;

	down = up->remote;
	if (tb_switch_is_usb4(down->sw))
		return usb4_port_configure(down);
	return tb_lc_configure_port(down);
}

/**
 * tb_switch_unconfigure_link() - Unconfigure link
 * @sw: Switch whose link is unconfigured
 *
 * Sets the link unconfigured so the @sw will be disconnected if the
 * domain exists sleep.
 */
void tb_switch_unconfigure_link(struct tb_switch *sw)
{
	struct tb_port *up, *down;

	if (!tb_route(sw) || tb_switch_is_icm(sw))
		return;

	/*
	 * Unconfigure downstream port so that wake-on-connect can be
	 * configured after router unplug. No need to unconfigure upstream port
	 * since its router is unplugged.
	 */
	up = tb_upstream_port(sw);
	down = up->remote;
	if (tb_switch_is_usb4(down->sw))
		usb4_port_unconfigure(down);
	else
		tb_lc_unconfigure_port(down);

	if (sw->is_unplugged)
		return;

	up = tb_upstream_port(sw);
	if (tb_switch_is_usb4(up->sw))
		usb4_port_unconfigure(up);
	else
		tb_lc_unconfigure_port(up);
}

static void tb_switch_credits_init(struct tb_switch *sw)
{
	if (tb_switch_is_icm(sw))
		return;
	if (!tb_switch_is_usb4(sw))
		return;
	if (usb4_switch_credits_init(sw))
		tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
}

static int tb_switch_port_hotplug_enable(struct tb_switch *sw)
{
	struct tb_port *port;

	if (tb_switch_is_icm(sw))
		return 0;

	tb_switch_for_each_port(sw, port) {
		int res;

		if (!port->cap_usb4)
			continue;

		res = usb4_port_hotplug_enable(port);
		if (res)
			return res;
	}
	return 0;
}

/**
 * tb_switch_add() - Add a switch to the domain
 * @sw: Switch to add
 *
 * This is the last step in adding switch to the domain. It will read
 * identification information from DROM and initializes ports so that
 * they can be used to connect other switches. The switch will be
 * exposed to the userspace when this function successfully returns. To
 * remove and release the switch, call tb_switch_remove().
 *
 * Return: %0 in case of success and negative errno in case of failure
 */
int tb_switch_add(struct tb_switch *sw)
{
	int i, ret;

	/*
	 * Initialize DMA control port now before we read DROM. Recent
	 * host controllers have more complete DROM on NVM that includes
	 * vendor and model identification strings which we then expose
	 * to the userspace. NVM can be accessed through DMA
	 * configuration based mailbox.
	 */
	ret = tb_switch_add_dma_port(sw);
	if (ret) {
		dev_err(&sw->dev, "failed to add DMA port\n");
		return ret;
	}

	if (!sw->safe_mode) {
		tb_switch_credits_init(sw);

		/* read drom */
		ret = tb_drom_read(sw);
		if (ret)
			dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
		tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);

		ret = tb_switch_set_uuid(sw);
		if (ret) {
			dev_err(&sw->dev, "failed to set UUID\n");
			return ret;
		}

		for (i = 0; i <= sw->config.max_port_number; i++) {
			if (sw->ports[i].disabled) {
				tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
				continue;
			}
			ret = tb_init_port(&sw->ports[i]);
			if (ret) {
				dev_err(&sw->dev, "failed to initialize port %d\n", i);
				return ret;
			}
		}

		tb_check_quirks(sw);

		tb_switch_default_link_ports(sw);

		ret = tb_switch_update_link_attributes(sw);
		if (ret)
			return ret;

		tb_switch_link_init(sw);

		ret = tb_switch_clx_init(sw);
		if (ret)
			return ret;

		ret = tb_switch_tmu_init(sw);
		if (ret)
			return ret;
	}

	ret = tb_switch_port_hotplug_enable(sw);
	if (ret)
		return ret;

	ret = device_add(&sw->dev);
	if (ret) {
		dev_err(&sw->dev, "failed to add device: %d\n", ret);
		return ret;
	}

	if (tb_route(sw)) {
		dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
			 sw->vendor, sw->device);
		if (sw->vendor_name && sw->device_name)
			dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
				 sw->device_name);
	}

	ret = usb4_switch_add_ports(sw);
	if (ret) {
		dev_err(&sw->dev, "failed to add USB4 ports\n");
		goto err_del;
	}

	ret = tb_switch_nvm_add(sw);
	if (ret) {
		dev_err(&sw->dev, "failed to add NVM devices\n");
		goto err_ports;
	}

	/*
	 * Thunderbolt routers do not generate wakeups themselves but
	 * they forward wakeups from tunneled protocols, so enable it
	 * here.
	 */
	device_init_wakeup(&sw->dev, true);

	pm_runtime_set_active(&sw->dev);
	if (sw->rpm) {
		pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
		pm_runtime_use_autosuspend(&sw->dev);
		pm_runtime_mark_last_busy(&sw->dev);
		pm_runtime_enable(&sw->dev);
		pm_request_autosuspend(&sw->dev);
	}

	tb_switch_debugfs_init(sw);
	return 0;

err_ports:
	usb4_switch_remove_ports(sw);
err_del:
	device_del(&sw->dev);

	return ret;
}

/**
 * tb_switch_remove() - Remove and release a switch
 * @sw: Switch to remove
 *
 * This will remove the switch from the domain and release it after last
 * reference count drops to zero. If there are switches connected below
 * this switch, they will be removed as well.
 */
void tb_switch_remove(struct tb_switch *sw)
{
	struct tb_port *port;

	tb_switch_debugfs_remove(sw);

	if (sw->rpm) {
		pm_runtime_get_sync(&sw->dev);
		pm_runtime_disable(&sw->dev);
	}

	/* port 0 is the switch itself and never has a remote */
	tb_switch_for_each_port(sw, port) {
		if (tb_port_has_remote(port)) {
			tb_switch_remove(port->remote->sw);
			port->remote = NULL;
		} else if (port->xdomain) {
			tb_xdomain_remove(port->xdomain);
			port->xdomain = NULL;
		}

		/* Remove any downstream retimers */
		tb_retimer_remove_all(port);
	}

	if (!sw->is_unplugged)
		tb_plug_events_active(sw, false);

	tb_switch_nvm_remove(sw);
	usb4_switch_remove_ports(sw);

	if (tb_route(sw))
		dev_info(&sw->dev, "device disconnected\n");
	device_unregister(&sw->dev);
}

/**
 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
 * @sw: Router to mark unplugged
 */
void tb_sw_set_unplugged(struct tb_switch *sw)
{
	struct tb_port *port;

	if (sw == sw->tb->root_switch) {
		tb_sw_WARN(sw, "cannot unplug root switch\n");
		return;
	}
	if (sw->is_unplugged) {
		tb_sw_WARN(sw, "is_unplugged already set\n");
		return;
	}
	sw->is_unplugged = true;
	tb_switch_for_each_port(sw, port) {
		if (tb_port_has_remote(port))
			tb_sw_set_unplugged(port->remote->sw);
		else if (port->xdomain)
			port->xdomain->is_unplugged = true;
	}
}

static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
{
	if (flags)
		tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
	else
		tb_sw_dbg(sw, "disabling wakeup\n");

	if (tb_switch_is_usb4(sw))
		return usb4_switch_set_wake(sw, flags);
	return tb_lc_set_wake(sw, flags);
}

static void tb_switch_check_wakes(struct tb_switch *sw)
{
	if (device_may_wakeup(&sw->dev)) {
		if (tb_switch_is_usb4(sw))
			usb4_switch_check_wakes(sw);
	}
}

/**
 * tb_switch_resume() - Resume a switch after sleep
 * @sw: Switch to resume
 * @runtime: Is this resume from runtime suspend or system sleep
 *
 * Resumes and re-enumerates router (and all its children), if still plugged
 * after suspend. Don't enumerate device router whose UID was changed during
 * suspend. If this is resume from system sleep, notifies PM core about the
 * wakes occurred during suspend. Disables all wakes, except USB4 wake of
 * upstream port for USB4 routers that shall be always enabled.
 */
int tb_switch_resume(struct tb_switch *sw, bool runtime)
{
	struct tb_port *port;
	int err;

	tb_sw_dbg(sw, "resuming switch\n");

	/*
	 * Check for UID of the connected switches except for root
	 * switch which we assume cannot be removed.
	 */
	if (tb_route(sw)) {
		u64 uid;

		/*
		 * Check first that we can still read the switch config
		 * space. It may be that there is now another domain
		 * connected.
		 */
		err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
		if (err < 0) {
			tb_sw_info(sw, "switch not present anymore\n");
			return err;
		}

		/* We don't have any way to confirm this was the same device */
		if (!sw->uid)
			return -ENODEV;

		if (tb_switch_is_usb4(sw))
			err = usb4_switch_read_uid(sw, &uid);
		else
			err = tb_drom_read_uid_only(sw, &uid);
		if (err) {
			tb_sw_warn(sw, "uid read failed\n");
			return err;
		}
		if (sw->uid != uid) {
			tb_sw_info(sw,
				"changed while suspended (uid %#llx -> %#llx)\n",
				sw->uid, uid);
			return -ENODEV;
		}
	}

	err = tb_switch_configure(sw);
	if (err)
		return err;

	if (!runtime)
		tb_switch_check_wakes(sw);

	/* Disable wakes */
	tb_switch_set_wake(sw, 0);

	err = tb_switch_tmu_init(sw);
	if (err)
		return err;

	/* check for surviving downstream switches */
	tb_switch_for_each_port(sw, port) {
		if (!tb_port_is_null(port))
			continue;

		if (!tb_port_resume(port))
			continue;

		if (tb_wait_for_port(port, true) <= 0) {
			tb_port_warn(port,
				     "lost during suspend, disconnecting\n");
			if (tb_port_has_remote(port))
				tb_sw_set_unplugged(port->remote->sw);
			else if (port->xdomain)
				port->xdomain->is_unplugged = true;
		} else {
			/*
			 * Always unlock the port so the downstream
			 * switch/domain is accessible.
			 */
			if (tb_port_unlock(port))
				tb_port_warn(port, "failed to unlock port\n");
			if (port->remote &&
			    tb_switch_resume(port->remote->sw, runtime)) {
				tb_port_warn(port,
					     "lost during suspend, disconnecting\n");
				tb_sw_set_unplugged(port->remote->sw);
			}
		}
	}
	return 0;
}

/**
 * tb_switch_suspend() - Put a switch to sleep
 * @sw: Switch to suspend
 * @runtime: Is this runtime suspend or system sleep
 *
 * Suspends router and all its children. Enables wakes according to
 * value of @runtime and then sets sleep bit for the router. If @sw is
 * host router the domain is ready to go to sleep once this function
 * returns.
 */
void tb_switch_suspend(struct tb_switch *sw, bool runtime)
{
	unsigned int flags = 0;
	struct tb_port *port;
	int err;

	tb_sw_dbg(sw, "suspending switch\n");

	/*
	 * Actually only needed for Titan Ridge but for simplicity can be
	 * done for USB4 device too as CLx is re-enabled at resume.
	 */
	tb_switch_clx_disable(sw);

	err = tb_plug_events_active(sw, false);
	if (err)
		return;

	tb_switch_for_each_port(sw, port) {
		if (tb_port_has_remote(port))
			tb_switch_suspend(port->remote->sw, runtime);
	}

	if (runtime) {
		/* Trigger wake when something is plugged in/out */
		flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
		flags |= TB_WAKE_ON_USB4;
		flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
	} else if (device_may_wakeup(&sw->dev)) {
		flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
	}

	tb_switch_set_wake(sw, flags);

	if (tb_switch_is_usb4(sw))
		usb4_switch_set_sleep(sw);
	else
		tb_lc_set_sleep(sw);
}

/**
 * tb_switch_query_dp_resource() - Query availability of DP resource
 * @sw: Switch whose DP resource is queried
 * @in: DP IN port
 *
 * Queries availability of DP resource for DP tunneling using switch
 * specific means. Returns %true if resource is available.
 */
bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
{
	if (tb_switch_is_usb4(sw))
		return usb4_switch_query_dp_resource(sw, in);
	return tb_lc_dp_sink_query(sw, in);
}

/**
 * tb_switch_alloc_dp_resource() - Allocate available DP resource
 * @sw: Switch whose DP resource is allocated
 * @in: DP IN port
 *
 * Allocates DP resource for DP tunneling. The resource must be
 * available for this to succeed (see tb_switch_query_dp_resource()).
 * Returns %0 in success and negative errno otherwise.
 */
int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
{
	int ret;

	if (tb_switch_is_usb4(sw))
		ret = usb4_switch_alloc_dp_resource(sw, in);
	else
		ret = tb_lc_dp_sink_alloc(sw, in);

	if (ret)
		tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
			   in->port);
	else
		tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);

	return ret;
}

/**
 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
 * @sw: Switch whose DP resource is de-allocated
 * @in: DP IN port
 *
 * De-allocates DP resource that was previously allocated for DP
 * tunneling.
 */
void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
{
	int ret;

	if (tb_switch_is_usb4(sw))
		ret = usb4_switch_dealloc_dp_resource(sw, in);
	else
		ret = tb_lc_dp_sink_dealloc(sw, in);

	if (ret)
		tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
			   in->port);
	else
		tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
}

struct tb_sw_lookup {
	struct tb *tb;
	u8 link;
	u8 depth;
	const uuid_t *uuid;
	u64 route;
};

static int tb_switch_match(struct device *dev, const void *data)
{
	struct tb_switch *sw = tb_to_switch(dev);
	const struct tb_sw_lookup *lookup = data;

	if (!sw)
		return 0;
	if (sw->tb != lookup->tb)
		return 0;

	if (lookup->uuid)
		return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));

	if (lookup->route) {
		return sw->config.route_lo == lower_32_bits(lookup->route) &&
		       sw->config.route_hi == upper_32_bits(lookup->route);
	}

	/* Root switch is matched only by depth */
	if (!lookup->depth)
		return !sw->depth;

	return sw->link == lookup->link && sw->depth == lookup->depth;
}

/**
 * tb_switch_find_by_link_depth() - Find switch by link and depth
 * @tb: Domain the switch belongs
 * @link: Link number the switch is connected
 * @depth: Depth of the switch in link
 *
 * Returned switch has reference count increased so the caller needs to
 * call tb_switch_put() when done with the switch.
 */
struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
{
	struct tb_sw_lookup lookup;
	struct device *dev;

	memset(&lookup, 0, sizeof(lookup));
	lookup.tb = tb;
	lookup.link = link;
	lookup.depth = depth;

	dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
	if (dev)
		return tb_to_switch(dev);

	return NULL;
}

/**
 * tb_switch_find_by_uuid() - Find switch by UUID
 * @tb: Domain the switch belongs
 * @uuid: UUID to look for
 *
 * Returned switch has reference count increased so the caller needs to
 * call tb_switch_put() when done with the switch.
 */
struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
{
	struct tb_sw_lookup lookup;
	struct device *dev;

	memset(&lookup, 0, sizeof(lookup));
	lookup.tb = tb;
	lookup.uuid = uuid;

	dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
	if (dev)
		return tb_to_switch(dev);

	return NULL;
}

/**
 * tb_switch_find_by_route() - Find switch by route string
 * @tb: Domain the switch belongs
 * @route: Route string to look for
 *
 * Returned switch has reference count increased so the caller needs to
 * call tb_switch_put() when done with the switch.
 */
struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
{
	struct tb_sw_lookup lookup;
	struct device *dev;

	if (!route)
		return tb_switch_get(tb->root_switch);

	memset(&lookup, 0, sizeof(lookup));
	lookup.tb = tb;
	lookup.route = route;

	dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
	if (dev)
		return tb_to_switch(dev);

	return NULL;
}

/**
 * tb_switch_find_port() - return the first port of @type on @sw or NULL
 * @sw: Switch to find the port from
 * @type: Port type to look for
 */
struct tb_port *tb_switch_find_port(struct tb_switch *sw,
				    enum tb_port_type type)
{
	struct tb_port *port;

	tb_switch_for_each_port(sw, port) {
		if (port->config.type == type)
			return port;
	}

	return NULL;
}

/*
 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
 * device. For now used only for Titan Ridge.
 */
static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
				       unsigned int pcie_offset, u32 value)
{
	u32 offset, command, val;
	int ret;

	if (sw->generation != 3)
		return -EOPNOTSUPP;

	offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
	ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
	if (ret)
		return ret;

	command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
	command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
	command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
	command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
			<< TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
	command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;

	offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;

	ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
	if (ret)
		return ret;

	ret = tb_switch_wait_for_bit(sw, offset,
				     TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
	if (ret)
		return ret;

	ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
	if (ret)
		return ret;

	if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
		return -ETIMEDOUT;

	return 0;
}

/**
 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
 * @sw: Router to enable PCIe L1
 *
 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
 * was configured. Due to Intel platforms limitation, shall be called only
 * for first hop switch.
 */
int tb_switch_pcie_l1_enable(struct tb_switch *sw)
{
	struct tb_switch *parent = tb_switch_parent(sw);
	int ret;

	if (!tb_route(sw))
		return 0;

	if (!tb_switch_is_titan_ridge(sw))
		return 0;

	/* Enable PCIe L1 enable only for first hop router (depth = 1) */
	if (tb_route(parent))
		return 0;

	/* Write to downstream PCIe bridge #5 aka Dn4 */
	ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
	if (ret)
		return ret;

	/* Write to Upstream PCIe bridge #0 aka Up0 */
	return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
}

/**
 * tb_switch_xhci_connect() - Connect internal xHCI
 * @sw: Router whose xHCI to connect
 *
 * Can be called to any router. For Alpine Ridge and Titan Ridge
 * performs special flows that bring the xHCI functional for any device
 * connected to the type-C port. Call only after PCIe tunnel has been
 * established. The function only does the connect if not done already
 * so can be called several times for the same router.
 */
int tb_switch_xhci_connect(struct tb_switch *sw)
{
	struct tb_port *port1, *port3;
	int ret;

	if (sw->generation != 3)
		return 0;

	port1 = &sw->ports[1];
	port3 = &sw->ports[3];

	if (tb_switch_is_alpine_ridge(sw)) {
		bool usb_port1, usb_port3, xhci_port1, xhci_port3;

		usb_port1 = tb_lc_is_usb_plugged(port1);
		usb_port3 = tb_lc_is_usb_plugged(port3);
		xhci_port1 = tb_lc_is_xhci_connected(port1);
		xhci_port3 = tb_lc_is_xhci_connected(port3);

		/* Figure out correct USB port to connect */
		if (usb_port1 && !xhci_port1) {
			ret = tb_lc_xhci_connect(port1);
			if (ret)
				return ret;
		}
		if (usb_port3 && !xhci_port3)
			return tb_lc_xhci_connect(port3);
	} else if (tb_switch_is_titan_ridge(sw)) {
		ret = tb_lc_xhci_connect(port1);
		if (ret)
			return ret;
		return tb_lc_xhci_connect(port3);
	}

	return 0;
}

/**
 * tb_switch_xhci_disconnect() - Disconnect internal xHCI
 * @sw: Router whose xHCI to disconnect
 *
 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
 * ports.
 */
void tb_switch_xhci_disconnect(struct tb_switch *sw)
{
	if (sw->generation == 3) {
		struct tb_port *port1 = &sw->ports[1];
		struct tb_port *port3 = &sw->ports[3];

		tb_lc_xhci_disconnect(port1);
		tb_port_dbg(port1, "disconnected xHCI\n");
		tb_lc_xhci_disconnect(port3);
		tb_port_dbg(port3, "disconnected xHCI\n");
	}
}