aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/powernv/pci-ioda.c
blob: 3ba435ec3dcd584e5f466b78eae18379a69d482b (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
/*
 * Support PCI/PCIe on PowerNV platforms
 *
 * Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/crash_dump.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/msi.h>
#include <linux/memblock.h>

#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/msi_bitmap.h>
#include <asm/ppc-pci.h>
#include <asm/opal.h>
#include <asm/iommu.h>
#include <asm/tce.h>
#include <asm/xics.h>
#include <asm/debug.h>
#include <asm/firmware.h>
#include <asm/pnv-pci.h>

#include <misc/cxl.h>

#include "powernv.h"
#include "pci.h"

static void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level,
			    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	char pfix[32];

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	if (pe->pdev)
		strlcpy(pfix, dev_name(&pe->pdev->dev), sizeof(pfix));
	else
		sprintf(pfix, "%04x:%02x     ",
			pci_domain_nr(pe->pbus), pe->pbus->number);

	printk("%spci %s: [PE# %.3d] %pV",
	       level, pfix, pe->pe_number, &vaf);

	va_end(args);
}

#define pe_err(pe, fmt, ...)					\
	pe_level_printk(pe, KERN_ERR, fmt, ##__VA_ARGS__)
#define pe_warn(pe, fmt, ...)					\
	pe_level_printk(pe, KERN_WARNING, fmt, ##__VA_ARGS__)
#define pe_info(pe, fmt, ...)					\
	pe_level_printk(pe, KERN_INFO, fmt, ##__VA_ARGS__)

/*
 * stdcix is only supposed to be used in hypervisor real mode as per
 * the architecture spec
 */
static inline void __raw_rm_writeq(u64 val, volatile void __iomem *paddr)
{
	__asm__ __volatile__("stdcix %0,0,%1"
		: : "r" (val), "r" (paddr) : "memory");
}

static inline bool pnv_pci_is_mem_pref_64(unsigned long flags)
{
	return ((flags & (IORESOURCE_MEM_64 | IORESOURCE_PREFETCH)) ==
		(IORESOURCE_MEM_64 | IORESOURCE_PREFETCH));
}

static int pnv_ioda_alloc_pe(struct pnv_phb *phb)
{
	unsigned long pe;

	do {
		pe = find_next_zero_bit(phb->ioda.pe_alloc,
					phb->ioda.total_pe, 0);
		if (pe >= phb->ioda.total_pe)
			return IODA_INVALID_PE;
	} while(test_and_set_bit(pe, phb->ioda.pe_alloc));

	phb->ioda.pe_array[pe].phb = phb;
	phb->ioda.pe_array[pe].pe_number = pe;
	return pe;
}

static void pnv_ioda_free_pe(struct pnv_phb *phb, int pe)
{
	WARN_ON(phb->ioda.pe_array[pe].pdev);

	memset(&phb->ioda.pe_array[pe], 0, sizeof(struct pnv_ioda_pe));
	clear_bit(pe, phb->ioda.pe_alloc);
}

/* The default M64 BAR is shared by all PEs */
static int pnv_ioda2_init_m64(struct pnv_phb *phb)
{
	const char *desc;
	struct resource *r;
	s64 rc;

	/* Configure the default M64 BAR */
	rc = opal_pci_set_phb_mem_window(phb->opal_id,
					 OPAL_M64_WINDOW_TYPE,
					 phb->ioda.m64_bar_idx,
					 phb->ioda.m64_base,
					 0, /* unused */
					 phb->ioda.m64_size);
	if (rc != OPAL_SUCCESS) {
		desc = "configuring";
		goto fail;
	}

	/* Enable the default M64 BAR */
	rc = opal_pci_phb_mmio_enable(phb->opal_id,
				      OPAL_M64_WINDOW_TYPE,
				      phb->ioda.m64_bar_idx,
				      OPAL_ENABLE_M64_SPLIT);
	if (rc != OPAL_SUCCESS) {
		desc = "enabling";
		goto fail;
	}

	/* Mark the M64 BAR assigned */
	set_bit(phb->ioda.m64_bar_idx, &phb->ioda.m64_bar_alloc);

	/*
	 * Strip off the segment used by the reserved PE, which is
	 * expected to be 0 or last one of PE capabicity.
	 */
	r = &phb->hose->mem_resources[1];
	if (phb->ioda.reserved_pe == 0)
		r->start += phb->ioda.m64_segsize;
	else if (phb->ioda.reserved_pe == (phb->ioda.total_pe - 1))
		r->end -= phb->ioda.m64_segsize;
	else
		pr_warn("  Cannot strip M64 segment for reserved PE#%d\n",
			phb->ioda.reserved_pe);

	return 0;

fail:
	pr_warn("  Failure %lld %s M64 BAR#%d\n",
		rc, desc, phb->ioda.m64_bar_idx);
	opal_pci_phb_mmio_enable(phb->opal_id,
				 OPAL_M64_WINDOW_TYPE,
				 phb->ioda.m64_bar_idx,
				 OPAL_DISABLE_M64);
	return -EIO;
}

static void pnv_ioda2_alloc_m64_pe(struct pnv_phb *phb)
{
	resource_size_t sgsz = phb->ioda.m64_segsize;
	struct pci_dev *pdev;
	struct resource *r;
	int base, step, i;

	/*
	 * Root bus always has full M64 range and root port has
	 * M64 range used in reality. So we're checking root port
	 * instead of root bus.
	 */
	list_for_each_entry(pdev, &phb->hose->bus->devices, bus_list) {
		for (i = PCI_BRIDGE_RESOURCES;
		     i <= PCI_BRIDGE_RESOURCE_END; i++) {
			r = &pdev->resource[i];
			if (!r->parent ||
			    !pnv_pci_is_mem_pref_64(r->flags))
				continue;

			base = (r->start - phb->ioda.m64_base) / sgsz;
			for (step = 0; step < resource_size(r) / sgsz; step++)
				set_bit(base + step, phb->ioda.pe_alloc);
		}
	}
}

static int pnv_ioda2_pick_m64_pe(struct pnv_phb *phb,
				 struct pci_bus *bus, int all)
{
	resource_size_t segsz = phb->ioda.m64_segsize;
	struct pci_dev *pdev;
	struct resource *r;
	struct pnv_ioda_pe *master_pe, *pe;
	unsigned long size, *pe_alloc;
	bool found;
	int start, i, j;

	/* Root bus shouldn't use M64 */
	if (pci_is_root_bus(bus))
		return IODA_INVALID_PE;

	/* We support only one M64 window on each bus */
	found = false;
	pci_bus_for_each_resource(bus, r, i) {
		if (r && r->parent &&
		    pnv_pci_is_mem_pref_64(r->flags)) {
			found = true;
			break;
		}
	}

	/* No M64 window found ? */
	if (!found)
		return IODA_INVALID_PE;

	/* Allocate bitmap */
	size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long));
	pe_alloc = kzalloc(size, GFP_KERNEL);
	if (!pe_alloc) {
		pr_warn("%s: Out of memory !\n",
			__func__);
		return IODA_INVALID_PE;
	}

	/*
	 * Figure out reserved PE numbers by the PE
	 * the its child PEs.
	 */
	start = (r->start - phb->ioda.m64_base) / segsz;
	for (i = 0; i < resource_size(r) / segsz; i++)
		set_bit(start + i, pe_alloc);

	if (all)
		goto done;

	/*
	 * If the PE doesn't cover all subordinate buses,
	 * we need subtract from reserved PEs for children.
	 */
	list_for_each_entry(pdev, &bus->devices, bus_list) {
		if (!pdev->subordinate)
			continue;

		pci_bus_for_each_resource(pdev->subordinate, r, i) {
			if (!r || !r->parent ||
			    !pnv_pci_is_mem_pref_64(r->flags))
				continue;

			start = (r->start - phb->ioda.m64_base) / segsz;
			for (j = 0; j < resource_size(r) / segsz ; j++)
				clear_bit(start + j, pe_alloc);
                }
        }

	/*
	 * the current bus might not own M64 window and that's all
	 * contributed by its child buses. For the case, we needn't
	 * pick M64 dependent PE#.
	 */
	if (bitmap_empty(pe_alloc, phb->ioda.total_pe)) {
		kfree(pe_alloc);
		return IODA_INVALID_PE;
	}

	/*
	 * Figure out the master PE and put all slave PEs to master
	 * PE's list to form compound PE.
	 */
done:
	master_pe = NULL;
	i = -1;
	while ((i = find_next_bit(pe_alloc, phb->ioda.total_pe, i + 1)) <
		phb->ioda.total_pe) {
		pe = &phb->ioda.pe_array[i];
		pe->phb = phb;
		pe->pe_number = i;

		if (!master_pe) {
			pe->flags |= PNV_IODA_PE_MASTER;
			INIT_LIST_HEAD(&pe->slaves);
			master_pe = pe;
		} else {
			pe->flags |= PNV_IODA_PE_SLAVE;
			pe->master = master_pe;
			list_add_tail(&pe->list, &master_pe->slaves);
		}
	}

	kfree(pe_alloc);
	return master_pe->pe_number;
}

static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb)
{
	struct pci_controller *hose = phb->hose;
	struct device_node *dn = hose->dn;
	struct resource *res;
	const u32 *r;
	u64 pci_addr;

	if (!firmware_has_feature(FW_FEATURE_OPALv3)) {
		pr_info("  Firmware too old to support M64 window\n");
		return;
	}

	r = of_get_property(dn, "ibm,opal-m64-window", NULL);
	if (!r) {
		pr_info("  No <ibm,opal-m64-window> on %s\n",
			dn->full_name);
		return;
	}

	/* FIXME: Support M64 for P7IOC */
	if (phb->type != PNV_PHB_IODA2) {
		pr_info("  Not support M64 window\n");
		return;
	}

	res = &hose->mem_resources[1];
	res->start = of_translate_address(dn, r + 2);
	res->end = res->start + of_read_number(r + 4, 2) - 1;
	res->flags = (IORESOURCE_MEM | IORESOURCE_MEM_64 | IORESOURCE_PREFETCH);
	pci_addr = of_read_number(r, 2);
	hose->mem_offset[1] = res->start - pci_addr;

	phb->ioda.m64_size = resource_size(res);
	phb->ioda.m64_segsize = phb->ioda.m64_size / phb->ioda.total_pe;
	phb->ioda.m64_base = pci_addr;

	/* Use last M64 BAR to cover M64 window */
	phb->ioda.m64_bar_idx = 15;
	phb->init_m64 = pnv_ioda2_init_m64;
	phb->alloc_m64_pe = pnv_ioda2_alloc_m64_pe;
	phb->pick_m64_pe = pnv_ioda2_pick_m64_pe;
}

static void pnv_ioda_freeze_pe(struct pnv_phb *phb, int pe_no)
{
	struct pnv_ioda_pe *pe = &phb->ioda.pe_array[pe_no];
	struct pnv_ioda_pe *slave;
	s64 rc;

	/* Fetch master PE */
	if (pe->flags & PNV_IODA_PE_SLAVE) {
		pe = pe->master;
		WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
		pe_no = pe->pe_number;
	}

	/* Freeze master PE */
	rc = opal_pci_eeh_freeze_set(phb->opal_id,
				     pe_no,
				     OPAL_EEH_ACTION_SET_FREEZE_ALL);
	if (rc != OPAL_SUCCESS) {
		pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n",
			__func__, rc, phb->hose->global_number, pe_no);
		return;
	}

	/* Freeze slave PEs */
	if (!(pe->flags & PNV_IODA_PE_MASTER))
		return;

	list_for_each_entry(slave, &pe->slaves, list) {
		rc = opal_pci_eeh_freeze_set(phb->opal_id,
					     slave->pe_number,
					     OPAL_EEH_ACTION_SET_FREEZE_ALL);
		if (rc != OPAL_SUCCESS)
			pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n",
				__func__, rc, phb->hose->global_number,
				slave->pe_number);
	}
}

static int pnv_ioda_unfreeze_pe(struct pnv_phb *phb, int pe_no, int opt)
{
	struct pnv_ioda_pe *pe, *slave;
	s64 rc;

	/* Find master PE */
	pe = &phb->ioda.pe_array[pe_no];
	if (pe->flags & PNV_IODA_PE_SLAVE) {
		pe = pe->master;
		WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
		pe_no = pe->pe_number;
	}

	/* Clear frozen state for master PE */
	rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no, opt);
	if (rc != OPAL_SUCCESS) {
		pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n",
			__func__, rc, opt, phb->hose->global_number, pe_no);
		return -EIO;
	}

	if (!(pe->flags & PNV_IODA_PE_MASTER))
		return 0;

	/* Clear frozen state for slave PEs */
	list_for_each_entry(slave, &pe->slaves, list) {
		rc = opal_pci_eeh_freeze_clear(phb->opal_id,
					     slave->pe_number,
					     opt);
		if (rc != OPAL_SUCCESS) {
			pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n",
				__func__, rc, opt, phb->hose->global_number,
				slave->pe_number);
			return -EIO;
		}
	}

	return 0;
}

static int pnv_ioda_get_pe_state(struct pnv_phb *phb, int pe_no)
{
	struct pnv_ioda_pe *slave, *pe;
	u8 fstate, state;
	__be16 pcierr;
	s64 rc;

	/* Sanity check on PE number */
	if (pe_no < 0 || pe_no >= phb->ioda.total_pe)
		return OPAL_EEH_STOPPED_PERM_UNAVAIL;

	/*
	 * Fetch the master PE and the PE instance might be
	 * not initialized yet.
	 */
	pe = &phb->ioda.pe_array[pe_no];
	if (pe->flags & PNV_IODA_PE_SLAVE) {
		pe = pe->master;
		WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
		pe_no = pe->pe_number;
	}

	/* Check the master PE */
	rc = opal_pci_eeh_freeze_status(phb->opal_id, pe_no,
					&state, &pcierr, NULL);
	if (rc != OPAL_SUCCESS) {
		pr_warn("%s: Failure %lld getting "
			"PHB#%x-PE#%x state\n",
			__func__, rc,
			phb->hose->global_number, pe_no);
		return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
	}

	/* Check the slave PE */
	if (!(pe->flags & PNV_IODA_PE_MASTER))
		return state;

	list_for_each_entry(slave, &pe->slaves, list) {
		rc = opal_pci_eeh_freeze_status(phb->opal_id,
						slave->pe_number,
						&fstate,
						&pcierr,
						NULL);
		if (rc != OPAL_SUCCESS) {
			pr_warn("%s: Failure %lld getting "
				"PHB#%x-PE#%x state\n",
				__func__, rc,
				phb->hose->global_number, slave->pe_number);
			return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
		}

		/*
		 * Override the result based on the ascending
		 * priority.
		 */
		if (fstate > state)
			state = fstate;
	}

	return state;
}

/* Currently those 2 are only used when MSIs are enabled, this will change
 * but in the meantime, we need to protect them to avoid warnings
 */
#ifdef CONFIG_PCI_MSI
static struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	struct pci_dn *pdn = pci_get_pdn(dev);

	if (!pdn)
		return NULL;
	if (pdn->pe_number == IODA_INVALID_PE)
		return NULL;
	return &phb->ioda.pe_array[pdn->pe_number];
}
#endif /* CONFIG_PCI_MSI */

static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
{
	struct pci_dev *parent;
	uint8_t bcomp, dcomp, fcomp;
	long rc, rid_end, rid;

	/* Bus validation ? */
	if (pe->pbus) {
		int count;

		dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER;
		fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER;
		parent = pe->pbus->self;
		if (pe->flags & PNV_IODA_PE_BUS_ALL)
			count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1;
		else
			count = 1;

		switch(count) {
		case  1: bcomp = OpalPciBusAll;		break;
		case  2: bcomp = OpalPciBus7Bits;	break;
		case  4: bcomp = OpalPciBus6Bits;	break;
		case  8: bcomp = OpalPciBus5Bits;	break;
		case 16: bcomp = OpalPciBus4Bits;	break;
		case 32: bcomp = OpalPciBus3Bits;	break;
		default:
			pr_err("%s: Number of subordinate busses %d"
			       " unsupported\n",
			       pci_name(pe->pbus->self), count);
			/* Do an exact match only */
			bcomp = OpalPciBusAll;
		}
		rid_end = pe->rid + (count << 8);
	} else {
		parent = pe->pdev->bus->self;
		bcomp = OpalPciBusAll;
		dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
		fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
		rid_end = pe->rid + 1;
	}

	/*
	 * Associate PE in PELT. We need add the PE into the
	 * corresponding PELT-V as well. Otherwise, the error
	 * originated from the PE might contribute to other
	 * PEs.
	 */
	rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
			     bcomp, dcomp, fcomp, OPAL_MAP_PE);
	if (rc) {
		pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc);
		return -ENXIO;
	}

	rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number,
				pe->pe_number, OPAL_ADD_PE_TO_DOMAIN);
	if (rc)
		pe_warn(pe, "OPAL error %d adding self to PELTV\n", rc);
	opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
				  OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);

	/* Add to all parents PELT-V */
	while (parent) {
		struct pci_dn *pdn = pci_get_pdn(parent);
		if (pdn && pdn->pe_number != IODA_INVALID_PE) {
			rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number,
						pe->pe_number, OPAL_ADD_PE_TO_DOMAIN);
			/* XXX What to do in case of error ? */
		}
		parent = parent->bus->self;
	}
	/* Setup reverse map */
	for (rid = pe->rid; rid < rid_end; rid++)
		phb->ioda.pe_rmap[rid] = pe->pe_number;

	/* Setup one MVTs on IODA1 */
	if (phb->type == PNV_PHB_IODA1) {
		pe->mve_number = pe->pe_number;
		rc = opal_pci_set_mve(phb->opal_id, pe->mve_number,
				      pe->pe_number);
		if (rc) {
			pe_err(pe, "OPAL error %ld setting up MVE %d\n",
			       rc, pe->mve_number);
			pe->mve_number = -1;
		} else {
			rc = opal_pci_set_mve_enable(phb->opal_id,
						     pe->mve_number, OPAL_ENABLE_MVE);
			if (rc) {
				pe_err(pe, "OPAL error %ld enabling MVE %d\n",
				       rc, pe->mve_number);
				pe->mve_number = -1;
			}
		}
	} else if (phb->type == PNV_PHB_IODA2)
		pe->mve_number = 0;

	return 0;
}

static void pnv_ioda_link_pe_by_weight(struct pnv_phb *phb,
				       struct pnv_ioda_pe *pe)
{
	struct pnv_ioda_pe *lpe;

	list_for_each_entry(lpe, &phb->ioda.pe_dma_list, dma_link) {
		if (lpe->dma_weight < pe->dma_weight) {
			list_add_tail(&pe->dma_link, &lpe->dma_link);
			return;
		}
	}
	list_add_tail(&pe->dma_link, &phb->ioda.pe_dma_list);
}

static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev)
{
	/* This is quite simplistic. The "base" weight of a device
	 * is 10. 0 means no DMA is to be accounted for it.
	 */

	/* If it's a bridge, no DMA */
	if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
		return 0;

	/* Reduce the weight of slow USB controllers */
	if (dev->class == PCI_CLASS_SERIAL_USB_UHCI ||
	    dev->class == PCI_CLASS_SERIAL_USB_OHCI ||
	    dev->class == PCI_CLASS_SERIAL_USB_EHCI)
		return 3;

	/* Increase the weight of RAID (includes Obsidian) */
	if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID)
		return 15;

	/* Default */
	return 10;
}

#if 0
static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	struct pci_dn *pdn = pci_get_pdn(dev);
	struct pnv_ioda_pe *pe;
	int pe_num;

	if (!pdn) {
		pr_err("%s: Device tree node not associated properly\n",
			   pci_name(dev));
		return NULL;
	}
	if (pdn->pe_number != IODA_INVALID_PE)
		return NULL;

	/* PE#0 has been pre-set */
	if (dev->bus->number == 0)
		pe_num = 0;
	else
		pe_num = pnv_ioda_alloc_pe(phb);
	if (pe_num == IODA_INVALID_PE) {
		pr_warning("%s: Not enough PE# available, disabling device\n",
			   pci_name(dev));
		return NULL;
	}

	/* NOTE: We get only one ref to the pci_dev for the pdn, not for the
	 * pointer in the PE data structure, both should be destroyed at the
	 * same time. However, this needs to be looked at more closely again
	 * once we actually start removing things (Hotplug, SR-IOV, ...)
	 *
	 * At some point we want to remove the PDN completely anyways
	 */
	pe = &phb->ioda.pe_array[pe_num];
	pci_dev_get(dev);
	pdn->pcidev = dev;
	pdn->pe_number = pe_num;
	pe->pdev = dev;
	pe->pbus = NULL;
	pe->tce32_seg = -1;
	pe->mve_number = -1;
	pe->rid = dev->bus->number << 8 | pdn->devfn;

	pe_info(pe, "Associated device to PE\n");

	if (pnv_ioda_configure_pe(phb, pe)) {
		/* XXX What do we do here ? */
		if (pe_num)
			pnv_ioda_free_pe(phb, pe_num);
		pdn->pe_number = IODA_INVALID_PE;
		pe->pdev = NULL;
		pci_dev_put(dev);
		return NULL;
	}

	/* Assign a DMA weight to the device */
	pe->dma_weight = pnv_ioda_dma_weight(dev);
	if (pe->dma_weight != 0) {
		phb->ioda.dma_weight += pe->dma_weight;
		phb->ioda.dma_pe_count++;
	}

	/* Link the PE */
	pnv_ioda_link_pe_by_weight(phb, pe);

	return pe;
}
#endif /* Useful for SRIOV case */

static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe)
{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		struct pci_dn *pdn = pci_get_pdn(dev);

		if (pdn == NULL) {
			pr_warn("%s: No device node associated with device !\n",
				pci_name(dev));
			continue;
		}
		pdn->pcidev = dev;
		pdn->pe_number = pe->pe_number;
		pe->dma_weight += pnv_ioda_dma_weight(dev);
		if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
			pnv_ioda_setup_same_PE(dev->subordinate, pe);
	}
}

/*
 * There're 2 types of PCI bus sensitive PEs: One that is compromised of
 * single PCI bus. Another one that contains the primary PCI bus and its
 * subordinate PCI devices and buses. The second type of PE is normally
 * orgiriated by PCIe-to-PCI bridge or PLX switch downstream ports.
 */
static void pnv_ioda_setup_bus_PE(struct pci_bus *bus, int all)
{
	struct pci_controller *hose = pci_bus_to_host(bus);
	struct pnv_phb *phb = hose->private_data;
	struct pnv_ioda_pe *pe;
	int pe_num = IODA_INVALID_PE;

	/* Check if PE is determined by M64 */
	if (phb->pick_m64_pe)
		pe_num = phb->pick_m64_pe(phb, bus, all);

	/* The PE number isn't pinned by M64 */
	if (pe_num == IODA_INVALID_PE)
		pe_num = pnv_ioda_alloc_pe(phb);

	if (pe_num == IODA_INVALID_PE) {
		pr_warning("%s: Not enough PE# available for PCI bus %04x:%02x\n",
			__func__, pci_domain_nr(bus), bus->number);
		return;
	}

	pe = &phb->ioda.pe_array[pe_num];
	pe->flags |= (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS);
	pe->pbus = bus;
	pe->pdev = NULL;
	pe->tce32_seg = -1;
	pe->mve_number = -1;
	pe->rid = bus->busn_res.start << 8;
	pe->dma_weight = 0;

	if (all)
		pe_info(pe, "Secondary bus %d..%d associated with PE#%d\n",
			bus->busn_res.start, bus->busn_res.end, pe_num);
	else
		pe_info(pe, "Secondary bus %d associated with PE#%d\n",
			bus->busn_res.start, pe_num);

	if (pnv_ioda_configure_pe(phb, pe)) {
		/* XXX What do we do here ? */
		if (pe_num)
			pnv_ioda_free_pe(phb, pe_num);
		pe->pbus = NULL;
		return;
	}

	/* Associate it with all child devices */
	pnv_ioda_setup_same_PE(bus, pe);

	/* Put PE to the list */
	list_add_tail(&pe->list, &phb->ioda.pe_list);

	/* Account for one DMA PE if at least one DMA capable device exist
	 * below the bridge
	 */
	if (pe->dma_weight != 0) {
		phb->ioda.dma_weight += pe->dma_weight;
		phb->ioda.dma_pe_count++;
	}

	/* Link the PE */
	pnv_ioda_link_pe_by_weight(phb, pe);
}

static void pnv_ioda_setup_PEs(struct pci_bus *bus)
{
	struct pci_dev *dev;

	pnv_ioda_setup_bus_PE(bus, 0);

	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (dev->subordinate) {
			if (pci_pcie_type(dev) == PCI_EXP_TYPE_PCI_BRIDGE)
				pnv_ioda_setup_bus_PE(dev->subordinate, 1);
			else
				pnv_ioda_setup_PEs(dev->subordinate);
		}
	}
}

/*
 * Configure PEs so that the downstream PCI buses and devices
 * could have their associated PE#. Unfortunately, we didn't
 * figure out the way to identify the PLX bridge yet. So we
 * simply put the PCI bus and the subordinate behind the root
 * port to PE# here. The game rule here is expected to be changed
 * as soon as we can detected PLX bridge correctly.
 */
static void pnv_pci_ioda_setup_PEs(void)
{
	struct pci_controller *hose, *tmp;
	struct pnv_phb *phb;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		phb = hose->private_data;

		/* M64 layout might affect PE allocation */
		if (phb->alloc_m64_pe)
			phb->alloc_m64_pe(phb);

		pnv_ioda_setup_PEs(hose->bus);
	}
}

static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev)
{
	struct pci_dn *pdn = pci_get_pdn(pdev);
	struct pnv_ioda_pe *pe;

	/*
	 * The function can be called while the PE#
	 * hasn't been assigned. Do nothing for the
	 * case.
	 */
	if (!pdn || pdn->pe_number == IODA_INVALID_PE)
		return;

	pe = &phb->ioda.pe_array[pdn->pe_number];
	WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
	set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table);
}

static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb,
				     struct pci_dev *pdev, u64 dma_mask)
{
	struct pci_dn *pdn = pci_get_pdn(pdev);
	struct pnv_ioda_pe *pe;
	uint64_t top;
	bool bypass = false;

	if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
		return -ENODEV;;

	pe = &phb->ioda.pe_array[pdn->pe_number];
	if (pe->tce_bypass_enabled) {
		top = pe->tce_bypass_base + memblock_end_of_DRAM() - 1;
		bypass = (dma_mask >= top);
	}

	if (bypass) {
		dev_info(&pdev->dev, "Using 64-bit DMA iommu bypass\n");
		set_dma_ops(&pdev->dev, &dma_direct_ops);
		set_dma_offset(&pdev->dev, pe->tce_bypass_base);
	} else {
		dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n");
		set_dma_ops(&pdev->dev, &dma_iommu_ops);
		set_iommu_table_base(&pdev->dev, &pe->tce32_table);
	}
	*pdev->dev.dma_mask = dma_mask;
	return 0;
}

static u64 pnv_pci_ioda_dma_get_required_mask(struct pnv_phb *phb,
					      struct pci_dev *pdev)
{
	struct pci_dn *pdn = pci_get_pdn(pdev);
	struct pnv_ioda_pe *pe;
	u64 end, mask;

	if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
		return 0;

	pe = &phb->ioda.pe_array[pdn->pe_number];
	if (!pe->tce_bypass_enabled)
		return __dma_get_required_mask(&pdev->dev);


	end = pe->tce_bypass_base + memblock_end_of_DRAM();
	mask = 1ULL << (fls64(end) - 1);
	mask += mask - 1;

	return mask;
}

static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe,
				   struct pci_bus *bus,
				   bool add_to_iommu_group)
{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (add_to_iommu_group)
			set_iommu_table_base_and_group(&dev->dev,
						       &pe->tce32_table);
		else
			set_iommu_table_base(&dev->dev, &pe->tce32_table);

		if (dev->subordinate)
			pnv_ioda_setup_bus_dma(pe, dev->subordinate,
					       add_to_iommu_group);
	}
}

static void pnv_pci_ioda1_tce_invalidate(struct pnv_ioda_pe *pe,
					 struct iommu_table *tbl,
					 __be64 *startp, __be64 *endp, bool rm)
{
	__be64 __iomem *invalidate = rm ?
		(__be64 __iomem *)pe->tce_inval_reg_phys :
		(__be64 __iomem *)tbl->it_index;
	unsigned long start, end, inc;
	const unsigned shift = tbl->it_page_shift;

	start = __pa(startp);
	end = __pa(endp);

	/* BML uses this case for p6/p7/galaxy2: Shift addr and put in node */
	if (tbl->it_busno) {
		start <<= shift;
		end <<= shift;
		inc = 128ull << shift;
		start |= tbl->it_busno;
		end |= tbl->it_busno;
	} else if (tbl->it_type & TCE_PCI_SWINV_PAIR) {
		/* p7ioc-style invalidation, 2 TCEs per write */
		start |= (1ull << 63);
		end |= (1ull << 63);
		inc = 16;
        } else {
		/* Default (older HW) */
                inc = 128;
	}

        end |= inc - 1;	/* round up end to be different than start */

        mb(); /* Ensure above stores are visible */
        while (start <= end) {
		if (rm)
			__raw_rm_writeq(cpu_to_be64(start), invalidate);
		else
			__raw_writeq(cpu_to_be64(start), invalidate);
                start += inc;
        }

	/*
	 * The iommu layer will do another mb() for us on build()
	 * and we don't care on free()
	 */
}

static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
					 struct iommu_table *tbl,
					 __be64 *startp, __be64 *endp, bool rm)
{
	unsigned long start, end, inc;
	__be64 __iomem *invalidate = rm ?
		(__be64 __iomem *)pe->tce_inval_reg_phys :
		(__be64 __iomem *)tbl->it_index;
	const unsigned shift = tbl->it_page_shift;

	/* We'll invalidate DMA address in PE scope */
	start = 0x2ull << 60;
	start |= (pe->pe_number & 0xFF);
	end = start;

	/* Figure out the start, end and step */
	inc = tbl->it_offset + (((u64)startp - tbl->it_base) / sizeof(u64));
	start |= (inc << shift);
	inc = tbl->it_offset + (((u64)endp - tbl->it_base) / sizeof(u64));
	end |= (inc << shift);
	inc = (0x1ull << shift);
	mb();

	while (start <= end) {
		if (rm)
			__raw_rm_writeq(cpu_to_be64(start), invalidate);
		else
			__raw_writeq(cpu_to_be64(start), invalidate);
		start += inc;
	}
}

void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
				 __be64 *startp, __be64 *endp, bool rm)
{
	struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
					      tce32_table);
	struct pnv_phb *phb = pe->phb;

	if (phb->type == PNV_PHB_IODA1)
		pnv_pci_ioda1_tce_invalidate(pe, tbl, startp, endp, rm);
	else
		pnv_pci_ioda2_tce_invalidate(pe, tbl, startp, endp, rm);
}

static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
				      struct pnv_ioda_pe *pe, unsigned int base,
				      unsigned int segs)
{

	struct page *tce_mem = NULL;
	const __be64 *swinvp;
	struct iommu_table *tbl;
	unsigned int i;
	int64_t rc;
	void *addr;

	/* 256M DMA window, 4K TCE pages, 8 bytes TCE */
#define TCE32_TABLE_SIZE	((0x10000000 / 0x1000) * 8)

	/* XXX FIXME: Handle 64-bit only DMA devices */
	/* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */
	/* XXX FIXME: Allocate multi-level tables on PHB3 */

	/* We shouldn't already have a 32-bit DMA associated */
	if (WARN_ON(pe->tce32_seg >= 0))
		return;

	/* Grab a 32-bit TCE table */
	pe->tce32_seg = base;
	pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
		(base << 28), ((base + segs) << 28) - 1);

	/* XXX Currently, we allocate one big contiguous table for the
	 * TCEs. We only really need one chunk per 256M of TCE space
	 * (ie per segment) but that's an optimization for later, it
	 * requires some added smarts with our get/put_tce implementation
	 */
	tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
				   get_order(TCE32_TABLE_SIZE * segs));
	if (!tce_mem) {
		pe_err(pe, " Failed to allocate a 32-bit TCE memory\n");
		goto fail;
	}
	addr = page_address(tce_mem);
	memset(addr, 0, TCE32_TABLE_SIZE * segs);

	/* Configure HW */
	for (i = 0; i < segs; i++) {
		rc = opal_pci_map_pe_dma_window(phb->opal_id,
					      pe->pe_number,
					      base + i, 1,
					      __pa(addr) + TCE32_TABLE_SIZE * i,
					      TCE32_TABLE_SIZE, 0x1000);
		if (rc) {
			pe_err(pe, " Failed to configure 32-bit TCE table,"
			       " err %ld\n", rc);
			goto fail;
		}
	}

	/* Setup linux iommu table */
	tbl = &pe->tce32_table;
	pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
				  base << 28, IOMMU_PAGE_SHIFT_4K);

	/* OPAL variant of P7IOC SW invalidated TCEs */
	swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
	if (swinvp) {
		/* We need a couple more fields -- an address and a data
		 * to or.  Since the bus is only printed out on table free
		 * errors, and on the first pass the data will be a relative
		 * bus number, print that out instead.
		 */
		pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
		tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
				8);
		tbl->it_type |= (TCE_PCI_SWINV_CREATE |
				 TCE_PCI_SWINV_FREE   |
				 TCE_PCI_SWINV_PAIR);
	}
	iommu_init_table(tbl, phb->hose->node);
	iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);

	if (pe->pdev)
		set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
	else
		pnv_ioda_setup_bus_dma(pe, pe->pbus, true);

	return;
 fail:
	/* XXX Failure: Try to fallback to 64-bit only ? */
	if (pe->tce32_seg >= 0)
		pe->tce32_seg = -1;
	if (tce_mem)
		__free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs));
}

static void pnv_pci_ioda2_set_bypass(struct iommu_table *tbl, bool enable)
{
	struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
					      tce32_table);
	uint16_t window_id = (pe->pe_number << 1 ) + 1;
	int64_t rc;

	pe_info(pe, "%sabling 64-bit DMA bypass\n", enable ? "En" : "Dis");
	if (enable) {
		phys_addr_t top = memblock_end_of_DRAM();

		top = roundup_pow_of_two(top);
		rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
						     pe->pe_number,
						     window_id,
						     pe->tce_bypass_base,
						     top);
	} else {
		rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
						     pe->pe_number,
						     window_id,
						     pe->tce_bypass_base,
						     0);

		/*
		 * EEH needs the mapping between IOMMU table and group
		 * of those VFIO/KVM pass-through devices. We can postpone
		 * resetting DMA ops until the DMA mask is configured in
		 * host side.
		 */
		if (pe->pdev)
			set_iommu_table_base(&pe->pdev->dev, tbl);
		else
			pnv_ioda_setup_bus_dma(pe, pe->pbus, false);
	}
	if (rc)
		pe_err(pe, "OPAL error %lld configuring bypass window\n", rc);
	else
		pe->tce_bypass_enabled = enable;
}

static void pnv_pci_ioda2_setup_bypass_pe(struct pnv_phb *phb,
					  struct pnv_ioda_pe *pe)
{
	/* TVE #1 is selected by PCI address bit 59 */
	pe->tce_bypass_base = 1ull << 59;

	/* Install set_bypass callback for VFIO */
	pe->tce32_table.set_bypass = pnv_pci_ioda2_set_bypass;

	/* Enable bypass by default */
	pnv_pci_ioda2_set_bypass(&pe->tce32_table, true);
}

static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
				       struct pnv_ioda_pe *pe)
{
	struct page *tce_mem = NULL;
	void *addr;
	const __be64 *swinvp;
	struct iommu_table *tbl;
	unsigned int tce_table_size, end;
	int64_t rc;

	/* We shouldn't already have a 32-bit DMA associated */
	if (WARN_ON(pe->tce32_seg >= 0))
		return;

	/* The PE will reserve all possible 32-bits space */
	pe->tce32_seg = 0;
	end = (1 << ilog2(phb->ioda.m32_pci_base));
	tce_table_size = (end / 0x1000) * 8;
	pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n",
		end);

	/* Allocate TCE table */
	tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
				   get_order(tce_table_size));
	if (!tce_mem) {
		pe_err(pe, "Failed to allocate a 32-bit TCE memory\n");
		goto fail;
	}
	addr = page_address(tce_mem);
	memset(addr, 0, tce_table_size);

	/*
	 * Map TCE table through TVT. The TVE index is the PE number
	 * shifted by 1 bit for 32-bits DMA space.
	 */
	rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
					pe->pe_number << 1, 1, __pa(addr),
					tce_table_size, 0x1000);
	if (rc) {
		pe_err(pe, "Failed to configure 32-bit TCE table,"
		       " err %ld\n", rc);
		goto fail;
	}

	/* Setup linux iommu table */
	tbl = &pe->tce32_table;
	pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
			IOMMU_PAGE_SHIFT_4K);

	/* OPAL variant of PHB3 invalidated TCEs */
	swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
	if (swinvp) {
		/* We need a couple more fields -- an address and a data
		 * to or.  Since the bus is only printed out on table free
		 * errors, and on the first pass the data will be a relative
		 * bus number, print that out instead.
		 */
		pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
		tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
				8);
		tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);
	}
	iommu_init_table(tbl, phb->hose->node);
	iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);

	if (pe->pdev)
		set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
	else
		pnv_ioda_setup_bus_dma(pe, pe->pbus, true);

	/* Also create a bypass window */
	pnv_pci_ioda2_setup_bypass_pe(phb, pe);
	return;
fail:
	if (pe->tce32_seg >= 0)
		pe->tce32_seg = -1;
	if (tce_mem)
		__free_pages(tce_mem, get_order(tce_table_size));
}

static void pnv_ioda_setup_dma(struct pnv_phb *phb)
{
	struct pci_controller *hose = phb->hose;
	unsigned int residual, remaining, segs, tw, base;
	struct pnv_ioda_pe *pe;

	/* If we have more PE# than segments available, hand out one
	 * per PE until we run out and let the rest fail. If not,
	 * then we assign at least one segment per PE, plus more based
	 * on the amount of devices under that PE
	 */
	if (phb->ioda.dma_pe_count > phb->ioda.tce32_count)
		residual = 0;
	else
		residual = phb->ioda.tce32_count -
			phb->ioda.dma_pe_count;

	pr_info("PCI: Domain %04x has %ld available 32-bit DMA segments\n",
		hose->global_number, phb->ioda.tce32_count);
	pr_info("PCI: %d PE# for a total weight of %d\n",
		phb->ioda.dma_pe_count, phb->ioda.dma_weight);

	/* Walk our PE list and configure their DMA segments, hand them
	 * out one base segment plus any residual segments based on
	 * weight
	 */
	remaining = phb->ioda.tce32_count;
	tw = phb->ioda.dma_weight;
	base = 0;
	list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
		if (!pe->dma_weight)
			continue;
		if (!remaining) {
			pe_warn(pe, "No DMA32 resources available\n");
			continue;
		}
		segs = 1;
		if (residual) {
			segs += ((pe->dma_weight * residual)  + (tw / 2)) / tw;
			if (segs > remaining)
				segs = remaining;
		}

		/*
		 * For IODA2 compliant PHB3, we needn't care about the weight.
		 * The all available 32-bits DMA space will be assigned to
		 * the specific PE.
		 */
		if (phb->type == PNV_PHB_IODA1) {
			pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n",
				pe->dma_weight, segs);
			pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
		} else {
			pe_info(pe, "Assign DMA32 space\n");
			segs = 0;
			pnv_pci_ioda2_setup_dma_pe(phb, pe);
		}

		remaining -= segs;
		base += segs;
	}
}

#ifdef CONFIG_PCI_MSI
static void pnv_ioda2_msi_eoi(struct irq_data *d)
{
	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
	struct irq_chip *chip = irq_data_get_irq_chip(d);
	struct pnv_phb *phb = container_of(chip, struct pnv_phb,
					   ioda.irq_chip);
	int64_t rc;

	rc = opal_pci_msi_eoi(phb->opal_id, hw_irq);
	WARN_ON_ONCE(rc);

	icp_native_eoi(d);
}


static void set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq)
{
	struct irq_data *idata;
	struct irq_chip *ichip;

	if (phb->type != PNV_PHB_IODA2)
		return;

	if (!phb->ioda.irq_chip_init) {
		/*
		 * First time we setup an MSI IRQ, we need to setup the
		 * corresponding IRQ chip to route correctly.
		 */
		idata = irq_get_irq_data(virq);
		ichip = irq_data_get_irq_chip(idata);
		phb->ioda.irq_chip_init = 1;
		phb->ioda.irq_chip = *ichip;
		phb->ioda.irq_chip.irq_eoi = pnv_ioda2_msi_eoi;
	}
	irq_set_chip(virq, &phb->ioda.irq_chip);
}

#ifdef CONFIG_CXL_BASE

struct device_node *pnv_pci_to_phb_node(struct pci_dev *dev)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);

	return hose->dn;
}
EXPORT_SYMBOL(pnv_pci_to_phb_node);

int pnv_phb_to_cxl(struct pci_dev *dev)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	struct pnv_ioda_pe *pe;
	int rc;

	pe = pnv_ioda_get_pe(dev);
	if (!pe)
		return -ENODEV;

	pe_info(pe, "Switching PHB to CXL\n");

	rc = opal_pci_set_phb_cxl_mode(phb->opal_id, 1, pe->pe_number);
	if (rc)
		dev_err(&dev->dev, "opal_pci_set_phb_cxl_mode failed: %i\n", rc);

	return rc;
}
EXPORT_SYMBOL(pnv_phb_to_cxl);

/* Find PHB for cxl dev and allocate MSI hwirqs?
 * Returns the absolute hardware IRQ number
 */
int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	int hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, num);

	if (hwirq < 0) {
		dev_warn(&dev->dev, "Failed to find a free MSI\n");
		return -ENOSPC;
	}

	return phb->msi_base + hwirq;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirqs);

void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;

	msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq - phb->msi_base, num);
}
EXPORT_SYMBOL(pnv_cxl_release_hwirqs);

void pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges *irqs,
				  struct pci_dev *dev)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	int i, hwirq;

	for (i = 1; i < CXL_IRQ_RANGES; i++) {
		if (!irqs->range[i])
			continue;
		pr_devel("cxl release irq range 0x%x: offset: 0x%lx  limit: %ld\n",
			 i, irqs->offset[i],
			 irqs->range[i]);
		hwirq = irqs->offset[i] - phb->msi_base;
		msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
				       irqs->range[i]);
	}
}
EXPORT_SYMBOL(pnv_cxl_release_hwirq_ranges);

int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs,
			       struct pci_dev *dev, int num)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	int i, hwirq, try;

	memset(irqs, 0, sizeof(struct cxl_irq_ranges));

	/* 0 is reserved for the multiplexed PSL DSI interrupt */
	for (i = 1; i < CXL_IRQ_RANGES && num; i++) {
		try = num;
		while (try) {
			hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, try);
			if (hwirq >= 0)
				break;
			try /= 2;
		}
		if (!try)
			goto fail;

		irqs->offset[i] = phb->msi_base + hwirq;
		irqs->range[i] = try;
		pr_devel("cxl alloc irq range 0x%x: offset: 0x%lx  limit: %li\n",
			 i, irqs->offset[i], irqs->range[i]);
		num -= try;
	}
	if (num)
		goto fail;

	return 0;
fail:
	pnv_cxl_release_hwirq_ranges(irqs, dev);
	return -ENOSPC;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirq_ranges);

int pnv_cxl_get_irq_count(struct pci_dev *dev)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;

	return phb->msi_bmp.irq_count;
}
EXPORT_SYMBOL(pnv_cxl_get_irq_count);

int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
			   unsigned int virq)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	unsigned int xive_num = hwirq - phb->msi_base;
	struct pnv_ioda_pe *pe;
	int rc;

	if (!(pe = pnv_ioda_get_pe(dev)))
		return -ENODEV;

	/* Assign XIVE to PE */
	rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
	if (rc) {
		pe_warn(pe, "%s: OPAL error %d setting msi_base 0x%x "
			"hwirq 0x%x XIVE 0x%x PE\n",
			pci_name(dev), rc, phb->msi_base, hwirq, xive_num);
		return -EIO;
	}
	set_msi_irq_chip(phb, virq);

	return 0;
}
EXPORT_SYMBOL(pnv_cxl_ioda_msi_setup);
#endif

static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
				  unsigned int hwirq, unsigned int virq,
				  unsigned int is_64, struct msi_msg *msg)
{
	struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
	unsigned int xive_num = hwirq - phb->msi_base;
	__be32 data;
	int rc;

	/* No PE assigned ? bail out ... no MSI for you ! */
	if (pe == NULL)
		return -ENXIO;

	/* Check if we have an MVE */
	if (pe->mve_number < 0)
		return -ENXIO;

	/* Force 32-bit MSI on some broken devices */
	if (dev->no_64bit_msi)
		is_64 = 0;

	/* Assign XIVE to PE */
	rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
	if (rc) {
		pr_warn("%s: OPAL error %d setting XIVE %d PE\n",
			pci_name(dev), rc, xive_num);
		return -EIO;
	}

	if (is_64) {
		__be64 addr64;

		rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1,
				     &addr64, &data);
		if (rc) {
			pr_warn("%s: OPAL error %d getting 64-bit MSI data\n",
				pci_name(dev), rc);
			return -EIO;
		}
		msg->address_hi = be64_to_cpu(addr64) >> 32;
		msg->address_lo = be64_to_cpu(addr64) & 0xfffffffful;
	} else {
		__be32 addr32;

		rc = opal_get_msi_32(phb->opal_id, pe->mve_number, xive_num, 1,
				     &addr32, &data);
		if (rc) {
			pr_warn("%s: OPAL error %d getting 32-bit MSI data\n",
				pci_name(dev), rc);
			return -EIO;
		}
		msg->address_hi = 0;
		msg->address_lo = be32_to_cpu(addr32);
	}
	msg->data = be32_to_cpu(data);

	set_msi_irq_chip(phb, virq);

	pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d),"
		 " address=%x_%08x data=%x PE# %d\n",
		 pci_name(dev), is_64 ? "64" : "32", hwirq, xive_num,
		 msg->address_hi, msg->address_lo, data, pe->pe_number);

	return 0;
}

static void pnv_pci_init_ioda_msis(struct pnv_phb *phb)
{
	unsigned int count;
	const __be32 *prop = of_get_property(phb->hose->dn,
					     "ibm,opal-msi-ranges", NULL);
	if (!prop) {
		/* BML Fallback */
		prop = of_get_property(phb->hose->dn, "msi-ranges", NULL);
	}
	if (!prop)
		return;

	phb->msi_base = be32_to_cpup(prop);
	count = be32_to_cpup(prop + 1);
	if (msi_bitmap_alloc(&phb->msi_bmp, count, phb->hose->dn)) {
		pr_err("PCI %d: Failed to allocate MSI bitmap !\n",
		       phb->hose->global_number);
		return;
	}

	phb->msi_setup = pnv_pci_ioda_msi_setup;
	phb->msi32_support = 1;
	pr_info("  Allocated bitmap for %d MSIs (base IRQ 0x%x)\n",
		count, phb->msi_base);
}
#else
static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { }
#endif /* CONFIG_PCI_MSI */

/*
 * This function is supposed to be called on basis of PE from top
 * to bottom style. So the the I/O or MMIO segment assigned to
 * parent PE could be overrided by its child PEs if necessary.
 */
static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
				  struct pnv_ioda_pe *pe)
{
	struct pnv_phb *phb = hose->private_data;
	struct pci_bus_region region;
	struct resource *res;
	int i, index;
	int rc;

	/*
	 * NOTE: We only care PCI bus based PE for now. For PCI
	 * device based PE, for example SRIOV sensitive VF should
	 * be figured out later.
	 */
	BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)));

	pci_bus_for_each_resource(pe->pbus, res, i) {
		if (!res || !res->flags ||
		    res->start > res->end)
			continue;

		if (res->flags & IORESOURCE_IO) {
			region.start = res->start - phb->ioda.io_pci_base;
			region.end   = res->end - phb->ioda.io_pci_base;
			index = region.start / phb->ioda.io_segsize;

			while (index < phb->ioda.total_pe &&
			       region.start <= region.end) {
				phb->ioda.io_segmap[index] = pe->pe_number;
				rc = opal_pci_map_pe_mmio_window(phb->opal_id,
					pe->pe_number, OPAL_IO_WINDOW_TYPE, 0, index);
				if (rc != OPAL_SUCCESS) {
					pr_err("%s: OPAL error %d when mapping IO "
					       "segment #%d to PE#%d\n",
					       __func__, rc, index, pe->pe_number);
					break;
				}

				region.start += phb->ioda.io_segsize;
				index++;
			}
		} else if (res->flags & IORESOURCE_MEM) {
			region.start = res->start -
				       hose->mem_offset[0] -
				       phb->ioda.m32_pci_base;
			region.end   = res->end -
				       hose->mem_offset[0] -
				       phb->ioda.m32_pci_base;
			index = region.start / phb->ioda.m32_segsize;

			while (index < phb->ioda.total_pe &&
			       region.start <= region.end) {
				phb->ioda.m32_segmap[index] = pe->pe_number;
				rc = opal_pci_map_pe_mmio_window(phb->opal_id,
					pe->pe_number, OPAL_M32_WINDOW_TYPE, 0, index);
				if (rc != OPAL_SUCCESS) {
					pr_err("%s: OPAL error %d when mapping M32 "
					       "segment#%d to PE#%d",
					       __func__, rc, index, pe->pe_number);
					break;
				}

				region.start += phb->ioda.m32_segsize;
				index++;
			}
		}
	}
}

static void pnv_pci_ioda_setup_seg(void)
{
	struct pci_controller *tmp, *hose;
	struct pnv_phb *phb;
	struct pnv_ioda_pe *pe;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		phb = hose->private_data;
		list_for_each_entry(pe, &phb->ioda.pe_list, list) {
			pnv_ioda_setup_pe_seg(hose, pe);
		}
	}
}

static void pnv_pci_ioda_setup_DMA(void)
{
	struct pci_controller *hose, *tmp;
	struct pnv_phb *phb;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		pnv_ioda_setup_dma(hose->private_data);

		/* Mark the PHB initialization done */
		phb = hose->private_data;
		phb->initialized = 1;
	}
}

static void pnv_pci_ioda_create_dbgfs(void)
{
#ifdef CONFIG_DEBUG_FS
	struct pci_controller *hose, *tmp;
	struct pnv_phb *phb;
	char name[16];

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		phb = hose->private_data;

		sprintf(name, "PCI%04x", hose->global_number);
		phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root);
		if (!phb->dbgfs)
			pr_warning("%s: Error on creating debugfs on PHB#%x\n",
				__func__, hose->global_number);
	}
#endif /* CONFIG_DEBUG_FS */
}

static void pnv_pci_ioda_fixup(void)
{
	pnv_pci_ioda_setup_PEs();
	pnv_pci_ioda_setup_seg();
	pnv_pci_ioda_setup_DMA();

	pnv_pci_ioda_create_dbgfs();

#ifdef CONFIG_EEH
	eeh_init();
	eeh_addr_cache_build();
#endif
}

/*
 * Returns the alignment for I/O or memory windows for P2P
 * bridges. That actually depends on how PEs are segmented.
 * For now, we return I/O or M32 segment size for PE sensitive
 * P2P bridges. Otherwise, the default values (4KiB for I/O,
 * 1MiB for memory) will be returned.
 *
 * The current PCI bus might be put into one PE, which was
 * create against the parent PCI bridge. For that case, we
 * needn't enlarge the alignment so that we can save some
 * resources.
 */
static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
						unsigned long type)
{
	struct pci_dev *bridge;
	struct pci_controller *hose = pci_bus_to_host(bus);
	struct pnv_phb *phb = hose->private_data;
	int num_pci_bridges = 0;

	bridge = bus->self;
	while (bridge) {
		if (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE) {
			num_pci_bridges++;
			if (num_pci_bridges >= 2)
				return 1;
		}

		bridge = bridge->bus->self;
	}

	/* We fail back to M32 if M64 isn't supported */
	if (phb->ioda.m64_segsize &&
	    pnv_pci_is_mem_pref_64(type))
		return phb->ioda.m64_segsize;
	if (type & IORESOURCE_MEM)
		return phb->ioda.m32_segsize;

	return phb->ioda.io_segsize;
}

/* Prevent enabling devices for which we couldn't properly
 * assign a PE
 */
static int pnv_pci_enable_device_hook(struct pci_dev *dev)
{
	struct pci_controller *hose = pci_bus_to_host(dev->bus);
	struct pnv_phb *phb = hose->private_data;
	struct pci_dn *pdn;

	/* The function is probably called while the PEs have
	 * not be created yet. For example, resource reassignment
	 * during PCI probe period. We just skip the check if
	 * PEs isn't ready.
	 */
	if (!phb->initialized)
		return 0;

	pdn = pci_get_pdn(dev);
	if (!pdn || pdn->pe_number == IODA_INVALID_PE)
		return -EINVAL;

	return 0;
}

static u32 pnv_ioda_bdfn_to_pe(struct pnv_phb *phb, struct pci_bus *bus,
			       u32 devfn)
{
	return phb->ioda.pe_rmap[(bus->number << 8) | devfn];
}

static void pnv_pci_ioda_shutdown(struct pnv_phb *phb)
{
	opal_pci_reset(phb->opal_id, OPAL_RESET_PCI_IODA_TABLE,
		       OPAL_ASSERT_RESET);
}

static void __init pnv_pci_init_ioda_phb(struct device_node *np,
					 u64 hub_id, int ioda_type)
{
	struct pci_controller *hose;
	struct pnv_phb *phb;
	unsigned long size, m32map_off, pemap_off, iomap_off = 0;
	const __be64 *prop64;
	const __be32 *prop32;
	int len;
	u64 phb_id;
	void *aux;
	long rc;

	pr_info("Initializing IODA%d OPAL PHB %s\n", ioda_type, np->full_name);

	prop64 = of_get_property(np, "ibm,opal-phbid", NULL);
	if (!prop64) {
		pr_err("  Missing \"ibm,opal-phbid\" property !\n");
		return;
	}
	phb_id = be64_to_cpup(prop64);
	pr_debug("  PHB-ID  : 0x%016llx\n", phb_id);

	phb = alloc_bootmem(sizeof(struct pnv_phb));
	if (!phb) {
		pr_err("  Out of memory !\n");
		return;
	}

	/* Allocate PCI controller */
	memset(phb, 0, sizeof(struct pnv_phb));
	phb->hose = hose = pcibios_alloc_controller(np);
	if (!phb->hose) {
		pr_err("  Can't allocate PCI controller for %s\n",
		       np->full_name);
		free_bootmem((unsigned long)phb, sizeof(struct pnv_phb));
		return;
	}

	spin_lock_init(&phb->lock);
	prop32 = of_get_property(np, "bus-range", &len);
	if (prop32 && len == 8) {
		hose->first_busno = be32_to_cpu(prop32[0]);
		hose->last_busno = be32_to_cpu(prop32[1]);
	} else {
		pr_warn("  Broken <bus-range> on %s\n", np->full_name);
		hose->first_busno = 0;
		hose->last_busno = 0xff;
	}
	hose->private_data = phb;
	phb->hub_id = hub_id;
	phb->opal_id = phb_id;
	phb->type = ioda_type;

	/* Detect specific models for error handling */
	if (of_device_is_compatible(np, "ibm,p7ioc-pciex"))
		phb->model = PNV_PHB_MODEL_P7IOC;
	else if (of_device_is_compatible(np, "ibm,power8-pciex"))
		phb->model = PNV_PHB_MODEL_PHB3;
	else
		phb->model = PNV_PHB_MODEL_UNKNOWN;

	/* Parse 32-bit and IO ranges (if any) */
	pci_process_bridge_OF_ranges(hose, np, !hose->global_number);

	/* Get registers */
	phb->regs = of_iomap(np, 0);
	if (phb->regs == NULL)
		pr_err("  Failed to map registers !\n");

	/* Initialize more IODA stuff */
	phb->ioda.total_pe = 1;
	prop32 = of_get_property(np, "ibm,opal-num-pes", NULL);
	if (prop32)
		phb->ioda.total_pe = be32_to_cpup(prop32);
	prop32 = of_get_property(np, "ibm,opal-reserved-pe", NULL);
	if (prop32)
		phb->ioda.reserved_pe = be32_to_cpup(prop32);

	/* Parse 64-bit MMIO range */
	pnv_ioda_parse_m64_window(phb);

	phb->ioda.m32_size = resource_size(&hose->mem_resources[0]);
	/* FW Has already off top 64k of M32 space (MSI space) */
	phb->ioda.m32_size += 0x10000;

	phb->ioda.m32_segsize = phb->ioda.m32_size / phb->ioda.total_pe;
	phb->ioda.m32_pci_base = hose->mem_resources[0].start - hose->mem_offset[0];
	phb->ioda.io_size = hose->pci_io_size;
	phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe;
	phb->ioda.io_pci_base = 0; /* XXX calculate this ? */

	/* Allocate aux data & arrays. We don't have IO ports on PHB3 */
	size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long));
	m32map_off = size;
	size += phb->ioda.total_pe * sizeof(phb->ioda.m32_segmap[0]);
	if (phb->type == PNV_PHB_IODA1) {
		iomap_off = size;
		size += phb->ioda.total_pe * sizeof(phb->ioda.io_segmap[0]);
	}
	pemap_off = size;
	size += phb->ioda.total_pe * sizeof(struct pnv_ioda_pe);
	aux = alloc_bootmem(size);
	memset(aux, 0, size);
	phb->ioda.pe_alloc = aux;
	phb->ioda.m32_segmap = aux + m32map_off;
	if (phb->type == PNV_PHB_IODA1)
		phb->ioda.io_segmap = aux + iomap_off;
	phb->ioda.pe_array = aux + pemap_off;
	set_bit(phb->ioda.reserved_pe, phb->ioda.pe_alloc);

	INIT_LIST_HEAD(&phb->ioda.pe_dma_list);
	INIT_LIST_HEAD(&phb->ioda.pe_list);

	/* Calculate how many 32-bit TCE segments we have */
	phb->ioda.tce32_count = phb->ioda.m32_pci_base >> 28;

#if 0 /* We should really do that ... */
	rc = opal_pci_set_phb_mem_window(opal->phb_id,
					 window_type,
					 window_num,
					 starting_real_address,
					 starting_pci_address,
					 segment_size);
#endif

	pr_info("  %03d (%03d) PE's M32: 0x%x [segment=0x%x]\n",
		phb->ioda.total_pe, phb->ioda.reserved_pe,
		phb->ioda.m32_size, phb->ioda.m32_segsize);
	if (phb->ioda.m64_size)
		pr_info("                 M64: 0x%lx [segment=0x%lx]\n",
			phb->ioda.m64_size, phb->ioda.m64_segsize);
	if (phb->ioda.io_size)
		pr_info("                  IO: 0x%x [segment=0x%x]\n",
			phb->ioda.io_size, phb->ioda.io_segsize);


	phb->hose->ops = &pnv_pci_ops;
	phb->get_pe_state = pnv_ioda_get_pe_state;
	phb->freeze_pe = pnv_ioda_freeze_pe;
	phb->unfreeze_pe = pnv_ioda_unfreeze_pe;
#ifdef CONFIG_EEH
	phb->eeh_ops = &ioda_eeh_ops;
#endif

	/* Setup RID -> PE mapping function */
	phb->bdfn_to_pe = pnv_ioda_bdfn_to_pe;

	/* Setup TCEs */
	phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;
	phb->dma_set_mask = pnv_pci_ioda_dma_set_mask;
	phb->dma_get_required_mask = pnv_pci_ioda_dma_get_required_mask;

	/* Setup shutdown function for kexec */
	phb->shutdown = pnv_pci_ioda_shutdown;

	/* Setup MSI support */
	pnv_pci_init_ioda_msis(phb);

	/*
	 * We pass the PCI probe flag PCI_REASSIGN_ALL_RSRC here
	 * to let the PCI core do resource assignment. It's supposed
	 * that the PCI core will do correct I/O and MMIO alignment
	 * for the P2P bridge bars so that each PCI bus (excluding
	 * the child P2P bridges) can form individual PE.
	 */
	ppc_md.pcibios_fixup = pnv_pci_ioda_fixup;
	ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook;
	ppc_md.pcibios_window_alignment = pnv_pci_window_alignment;
	ppc_md.pcibios_reset_secondary_bus = pnv_pci_reset_secondary_bus;
	pci_add_flags(PCI_REASSIGN_ALL_RSRC);

	/* Reset IODA tables to a clean state */
	rc = opal_pci_reset(phb_id, OPAL_RESET_PCI_IODA_TABLE, OPAL_ASSERT_RESET);
	if (rc)
		pr_warning("  OPAL Error %ld performing IODA table reset !\n", rc);

	/* If we're running in kdump kerenl, the previous kerenl never
	 * shutdown PCI devices correctly. We already got IODA table
	 * cleaned out. So we have to issue PHB reset to stop all PCI
	 * transactions from previous kerenl.
	 */
	if (is_kdump_kernel()) {
		pr_info("  Issue PHB reset ...\n");
		ioda_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL);
		ioda_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE);
	}

	/* Configure M64 window */
	if (phb->init_m64 && phb->init_m64(phb))
		hose->mem_resources[1].flags = 0;
}

void __init pnv_pci_init_ioda2_phb(struct device_node *np)
{
	pnv_pci_init_ioda_phb(np, 0, PNV_PHB_IODA2);
}

void __init pnv_pci_init_ioda_hub(struct device_node *np)
{
	struct device_node *phbn;
	const __be64 *prop64;
	u64 hub_id;

	pr_info("Probing IODA IO-Hub %s\n", np->full_name);

	prop64 = of_get_property(np, "ibm,opal-hubid", NULL);
	if (!prop64) {
		pr_err(" Missing \"ibm,opal-hubid\" property !\n");
		return;
	}
	hub_id = be64_to_cpup(prop64);
	pr_devel(" HUB-ID : 0x%016llx\n", hub_id);

	/* Count child PHBs */
	for_each_child_of_node(np, phbn) {
		/* Look for IODA1 PHBs */
		if (of_device_is_compatible(phbn, "ibm,ioda-phb"))
			pnv_pci_init_ioda_phb(phbn, hub_id, PNV_PHB_IODA1);
	}
}