summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/pseries/lpar.c
blob: b53359258d9953c551f9f90f694adf80240b1763 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * pSeries_lpar.c
 * Copyright (C) 2001 Todd Inglett, IBM Corporation
 *
 * pSeries LPAR support.
 */

/* Enables debugging of low-level hash table routines - careful! */
#undef DEBUG
#define pr_fmt(fmt) "lpar: " fmt

#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/console.h>
#include <linux/export.h>
#include <linux/jump_label.h>
#include <linux/delay.h>
#include <linux/stop_machine.h>
#include <linux/spinlock.h>
#include <linux/cpuhotplug.h>
#include <linux/workqueue.h>
#include <linux/proc_fs.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/cputable.h>
#include <asm/udbg.h>
#include <asm/smp.h>
#include <asm/trace.h>
#include <asm/firmware.h>
#include <asm/plpar_wrappers.h>
#include <asm/kexec.h>
#include <asm/fadump.h>
#include <asm/asm-prototypes.h>
#include <asm/debugfs.h>

#include "pseries.h"

/* Flag bits for H_BULK_REMOVE */
#define HBR_REQUEST	0x4000000000000000UL
#define HBR_RESPONSE	0x8000000000000000UL
#define HBR_END		0xc000000000000000UL
#define HBR_AVPN	0x0200000000000000UL
#define HBR_ANDCOND	0x0100000000000000UL


/* in hvCall.S */
EXPORT_SYMBOL(plpar_hcall);
EXPORT_SYMBOL(plpar_hcall9);
EXPORT_SYMBOL(plpar_hcall_norets);

/*
 * H_BLOCK_REMOVE supported block size for this page size in segment who's base
 * page size is that page size.
 *
 * The first index is the segment base page size, the second one is the actual
 * page size.
 */
static int hblkrm_size[MMU_PAGE_COUNT][MMU_PAGE_COUNT] __ro_after_init;

/*
 * Due to the involved complexity, and that the current hypervisor is only
 * returning this value or 0, we are limiting the support of the H_BLOCK_REMOVE
 * buffer size to 8 size block.
 */
#define HBLKRM_SUPPORTED_BLOCK_SIZE 8

#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
static u8 dtl_mask = DTL_LOG_PREEMPT;
#else
static u8 dtl_mask;
#endif

void alloc_dtl_buffers(unsigned long *time_limit)
{
	int cpu;
	struct paca_struct *pp;
	struct dtl_entry *dtl;

	for_each_possible_cpu(cpu) {
		pp = paca_ptrs[cpu];
		if (pp->dispatch_log)
			continue;
		dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
		if (!dtl) {
			pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
				cpu);
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
			pr_warn("Stolen time statistics will be unreliable\n");
#endif
			break;
		}

		pp->dtl_ridx = 0;
		pp->dispatch_log = dtl;
		pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
		pp->dtl_curr = dtl;

		if (time_limit && time_after(jiffies, *time_limit)) {
			cond_resched();
			*time_limit = jiffies + HZ;
		}
	}
}

void register_dtl_buffer(int cpu)
{
	long ret;
	struct paca_struct *pp;
	struct dtl_entry *dtl;
	int hwcpu = get_hard_smp_processor_id(cpu);

	pp = paca_ptrs[cpu];
	dtl = pp->dispatch_log;
	if (dtl && dtl_mask) {
		pp->dtl_ridx = 0;
		pp->dtl_curr = dtl;
		lppaca_of(cpu).dtl_idx = 0;

		/* hypervisor reads buffer length from this field */
		dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
		ret = register_dtl(hwcpu, __pa(dtl));
		if (ret)
			pr_err("WARNING: DTL registration of cpu %d (hw %d) failed with %ld\n",
			       cpu, hwcpu, ret);

		lppaca_of(cpu).dtl_enable_mask = dtl_mask;
	}
}

#ifdef CONFIG_PPC_SPLPAR
struct dtl_worker {
	struct delayed_work work;
	int cpu;
};

struct vcpu_dispatch_data {
	int last_disp_cpu;

	int total_disp;

	int same_cpu_disp;
	int same_chip_disp;
	int diff_chip_disp;
	int far_chip_disp;

	int numa_home_disp;
	int numa_remote_disp;
	int numa_far_disp;
};

/*
 * This represents the number of cpus in the hypervisor. Since there is no
 * architected way to discover the number of processors in the host, we
 * provision for dealing with NR_CPUS. This is currently 2048 by default, and
 * is sufficient for our purposes. This will need to be tweaked if
 * CONFIG_NR_CPUS is changed.
 */
#define NR_CPUS_H	NR_CPUS

DEFINE_RWLOCK(dtl_access_lock);
static DEFINE_PER_CPU(struct vcpu_dispatch_data, vcpu_disp_data);
static DEFINE_PER_CPU(u64, dtl_entry_ridx);
static DEFINE_PER_CPU(struct dtl_worker, dtl_workers);
static enum cpuhp_state dtl_worker_state;
static DEFINE_MUTEX(dtl_enable_mutex);
static int vcpudispatch_stats_on __read_mostly;
static int vcpudispatch_stats_freq = 50;
static __be32 *vcpu_associativity, *pcpu_associativity;


static void free_dtl_buffers(unsigned long *time_limit)
{
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
	int cpu;
	struct paca_struct *pp;

	for_each_possible_cpu(cpu) {
		pp = paca_ptrs[cpu];
		if (!pp->dispatch_log)
			continue;
		kmem_cache_free(dtl_cache, pp->dispatch_log);
		pp->dtl_ridx = 0;
		pp->dispatch_log = 0;
		pp->dispatch_log_end = 0;
		pp->dtl_curr = 0;

		if (time_limit && time_after(jiffies, *time_limit)) {
			cond_resched();
			*time_limit = jiffies + HZ;
		}
	}
#endif
}

static int init_cpu_associativity(void)
{
	vcpu_associativity = kcalloc(num_possible_cpus() / threads_per_core,
			VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL);
	pcpu_associativity = kcalloc(NR_CPUS_H / threads_per_core,
			VPHN_ASSOC_BUFSIZE * sizeof(__be32), GFP_KERNEL);

	if (!vcpu_associativity || !pcpu_associativity) {
		pr_err("error allocating memory for associativity information\n");
		return -ENOMEM;
	}

	return 0;
}

static void destroy_cpu_associativity(void)
{
	kfree(vcpu_associativity);
	kfree(pcpu_associativity);
	vcpu_associativity = pcpu_associativity = 0;
}

static __be32 *__get_cpu_associativity(int cpu, __be32 *cpu_assoc, int flag)
{
	__be32 *assoc;
	int rc = 0;

	assoc = &cpu_assoc[(int)(cpu / threads_per_core) * VPHN_ASSOC_BUFSIZE];
	if (!assoc[0]) {
		rc = hcall_vphn(cpu, flag, &assoc[0]);
		if (rc)
			return NULL;
	}

	return assoc;
}

static __be32 *get_pcpu_associativity(int cpu)
{
	return __get_cpu_associativity(cpu, pcpu_associativity, VPHN_FLAG_PCPU);
}

static __be32 *get_vcpu_associativity(int cpu)
{
	return __get_cpu_associativity(cpu, vcpu_associativity, VPHN_FLAG_VCPU);
}

static int cpu_relative_dispatch_distance(int last_disp_cpu, int cur_disp_cpu)
{
	__be32 *last_disp_cpu_assoc, *cur_disp_cpu_assoc;

	if (last_disp_cpu >= NR_CPUS_H || cur_disp_cpu >= NR_CPUS_H)
		return -EINVAL;

	last_disp_cpu_assoc = get_pcpu_associativity(last_disp_cpu);
	cur_disp_cpu_assoc = get_pcpu_associativity(cur_disp_cpu);

	if (!last_disp_cpu_assoc || !cur_disp_cpu_assoc)
		return -EIO;

	return cpu_distance(last_disp_cpu_assoc, cur_disp_cpu_assoc);
}

static int cpu_home_node_dispatch_distance(int disp_cpu)
{
	__be32 *disp_cpu_assoc, *vcpu_assoc;
	int vcpu_id = smp_processor_id();

	if (disp_cpu >= NR_CPUS_H) {
		pr_debug_ratelimited("vcpu dispatch cpu %d > %d\n",
						disp_cpu, NR_CPUS_H);
		return -EINVAL;
	}

	disp_cpu_assoc = get_pcpu_associativity(disp_cpu);
	vcpu_assoc = get_vcpu_associativity(vcpu_id);

	if (!disp_cpu_assoc || !vcpu_assoc)
		return -EIO;

	return cpu_distance(disp_cpu_assoc, vcpu_assoc);
}

static void update_vcpu_disp_stat(int disp_cpu)
{
	struct vcpu_dispatch_data *disp;
	int distance;

	disp = this_cpu_ptr(&vcpu_disp_data);
	if (disp->last_disp_cpu == -1) {
		disp->last_disp_cpu = disp_cpu;
		return;
	}

	disp->total_disp++;

	if (disp->last_disp_cpu == disp_cpu ||
		(cpu_first_thread_sibling(disp->last_disp_cpu) ==
					cpu_first_thread_sibling(disp_cpu)))
		disp->same_cpu_disp++;
	else {
		distance = cpu_relative_dispatch_distance(disp->last_disp_cpu,
								disp_cpu);
		if (distance < 0)
			pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n",
					smp_processor_id());
		else {
			switch (distance) {
			case 0:
				disp->same_chip_disp++;
				break;
			case 1:
				disp->diff_chip_disp++;
				break;
			case 2:
				disp->far_chip_disp++;
				break;
			default:
				pr_debug_ratelimited("vcpudispatch_stats: cpu %d (%d -> %d): unexpected relative dispatch distance %d\n",
						 smp_processor_id(),
						 disp->last_disp_cpu,
						 disp_cpu,
						 distance);
			}
		}
	}

	distance = cpu_home_node_dispatch_distance(disp_cpu);
	if (distance < 0)
		pr_debug_ratelimited("vcpudispatch_stats: cpu %d: error determining associativity\n",
				smp_processor_id());
	else {
		switch (distance) {
		case 0:
			disp->numa_home_disp++;
			break;
		case 1:
			disp->numa_remote_disp++;
			break;
		case 2:
			disp->numa_far_disp++;
			break;
		default:
			pr_debug_ratelimited("vcpudispatch_stats: cpu %d on %d: unexpected numa dispatch distance %d\n",
						 smp_processor_id(),
						 disp_cpu,
						 distance);
		}
	}

	disp->last_disp_cpu = disp_cpu;
}

static void process_dtl_buffer(struct work_struct *work)
{
	struct dtl_entry dtle;
	u64 i = __this_cpu_read(dtl_entry_ridx);
	struct dtl_entry *dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
	struct dtl_entry *dtl_end = local_paca->dispatch_log_end;
	struct lppaca *vpa = local_paca->lppaca_ptr;
	struct dtl_worker *d = container_of(work, struct dtl_worker, work.work);

	if (!local_paca->dispatch_log)
		return;

	/* if we have been migrated away, we cancel ourself */
	if (d->cpu != smp_processor_id()) {
		pr_debug("vcpudispatch_stats: cpu %d worker migrated -- canceling worker\n",
						smp_processor_id());
		return;
	}

	if (i == be64_to_cpu(vpa->dtl_idx))
		goto out;

	while (i < be64_to_cpu(vpa->dtl_idx)) {
		dtle = *dtl;
		barrier();
		if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) {
			/* buffer has overflowed */
			pr_debug_ratelimited("vcpudispatch_stats: cpu %d lost %lld DTL samples\n",
				d->cpu,
				be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG - i);
			i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG;
			dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
			continue;
		}
		update_vcpu_disp_stat(be16_to_cpu(dtle.processor_id));
		++i;
		++dtl;
		if (dtl == dtl_end)
			dtl = local_paca->dispatch_log;
	}

	__this_cpu_write(dtl_entry_ridx, i);

out:
	schedule_delayed_work_on(d->cpu, to_delayed_work(work),
					HZ / vcpudispatch_stats_freq);
}

static int dtl_worker_online(unsigned int cpu)
{
	struct dtl_worker *d = &per_cpu(dtl_workers, cpu);

	memset(d, 0, sizeof(*d));
	INIT_DELAYED_WORK(&d->work, process_dtl_buffer);
	d->cpu = cpu;

#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
	per_cpu(dtl_entry_ridx, cpu) = 0;
	register_dtl_buffer(cpu);
#else
	per_cpu(dtl_entry_ridx, cpu) = be64_to_cpu(lppaca_of(cpu).dtl_idx);
#endif

	schedule_delayed_work_on(cpu, &d->work, HZ / vcpudispatch_stats_freq);
	return 0;
}

static int dtl_worker_offline(unsigned int cpu)
{
	struct dtl_worker *d = &per_cpu(dtl_workers, cpu);

	cancel_delayed_work_sync(&d->work);

#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
	unregister_dtl(get_hard_smp_processor_id(cpu));
#endif

	return 0;
}

static void set_global_dtl_mask(u8 mask)
{
	int cpu;

	dtl_mask = mask;
	for_each_present_cpu(cpu)
		lppaca_of(cpu).dtl_enable_mask = dtl_mask;
}

static void reset_global_dtl_mask(void)
{
	int cpu;

#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
	dtl_mask = DTL_LOG_PREEMPT;
#else
	dtl_mask = 0;
#endif
	for_each_present_cpu(cpu)
		lppaca_of(cpu).dtl_enable_mask = dtl_mask;
}

static int dtl_worker_enable(unsigned long *time_limit)
{
	int rc = 0, state;

	if (!write_trylock(&dtl_access_lock)) {
		rc = -EBUSY;
		goto out;
	}

	set_global_dtl_mask(DTL_LOG_ALL);

	/* Setup dtl buffers and register those */
	alloc_dtl_buffers(time_limit);

	state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/dtl:online",
					dtl_worker_online, dtl_worker_offline);
	if (state < 0) {
		pr_err("vcpudispatch_stats: unable to setup workqueue for DTL processing\n");
		free_dtl_buffers(time_limit);
		reset_global_dtl_mask();
		write_unlock(&dtl_access_lock);
		rc = -EINVAL;
		goto out;
	}
	dtl_worker_state = state;

out:
	return rc;
}

static void dtl_worker_disable(unsigned long *time_limit)
{
	cpuhp_remove_state(dtl_worker_state);
	free_dtl_buffers(time_limit);
	reset_global_dtl_mask();
	write_unlock(&dtl_access_lock);
}

static ssize_t vcpudispatch_stats_write(struct file *file, const char __user *p,
		size_t count, loff_t *ppos)
{
	unsigned long time_limit = jiffies + HZ;
	struct vcpu_dispatch_data *disp;
	int rc, cmd, cpu;
	char buf[16];

	if (count > 15)
		return -EINVAL;

	if (copy_from_user(buf, p, count))
		return -EFAULT;

	buf[count] = 0;
	rc = kstrtoint(buf, 0, &cmd);
	if (rc || cmd < 0 || cmd > 1) {
		pr_err("vcpudispatch_stats: please use 0 to disable or 1 to enable dispatch statistics\n");
		return rc ? rc : -EINVAL;
	}

	mutex_lock(&dtl_enable_mutex);

	if ((cmd == 0 && !vcpudispatch_stats_on) ||
			(cmd == 1 && vcpudispatch_stats_on))
		goto out;

	if (cmd) {
		rc = init_cpu_associativity();
		if (rc)
			goto out;

		for_each_possible_cpu(cpu) {
			disp = per_cpu_ptr(&vcpu_disp_data, cpu);
			memset(disp, 0, sizeof(*disp));
			disp->last_disp_cpu = -1;
		}

		rc = dtl_worker_enable(&time_limit);
		if (rc) {
			destroy_cpu_associativity();
			goto out;
		}
	} else {
		dtl_worker_disable(&time_limit);
		destroy_cpu_associativity();
	}

	vcpudispatch_stats_on = cmd;

out:
	mutex_unlock(&dtl_enable_mutex);
	if (rc)
		return rc;
	return count;
}

static int vcpudispatch_stats_display(struct seq_file *p, void *v)
{
	int cpu;
	struct vcpu_dispatch_data *disp;

	if (!vcpudispatch_stats_on) {
		seq_puts(p, "off\n");
		return 0;
	}

	for_each_online_cpu(cpu) {
		disp = per_cpu_ptr(&vcpu_disp_data, cpu);
		seq_printf(p, "cpu%d", cpu);
		seq_put_decimal_ull(p, " ", disp->total_disp);
		seq_put_decimal_ull(p, " ", disp->same_cpu_disp);
		seq_put_decimal_ull(p, " ", disp->same_chip_disp);
		seq_put_decimal_ull(p, " ", disp->diff_chip_disp);
		seq_put_decimal_ull(p, " ", disp->far_chip_disp);
		seq_put_decimal_ull(p, " ", disp->numa_home_disp);
		seq_put_decimal_ull(p, " ", disp->numa_remote_disp);
		seq_put_decimal_ull(p, " ", disp->numa_far_disp);
		seq_puts(p, "\n");
	}

	return 0;
}

static int vcpudispatch_stats_open(struct inode *inode, struct file *file)
{
	return single_open(file, vcpudispatch_stats_display, NULL);
}

static const struct file_operations vcpudispatch_stats_proc_ops = {
	.open		= vcpudispatch_stats_open,
	.read		= seq_read,
	.write		= vcpudispatch_stats_write,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static ssize_t vcpudispatch_stats_freq_write(struct file *file,
		const char __user *p, size_t count, loff_t *ppos)
{
	int rc, freq;
	char buf[16];

	if (count > 15)
		return -EINVAL;

	if (copy_from_user(buf, p, count))
		return -EFAULT;

	buf[count] = 0;
	rc = kstrtoint(buf, 0, &freq);
	if (rc || freq < 1 || freq > HZ) {
		pr_err("vcpudispatch_stats_freq: please specify a frequency between 1 and %d\n",
				HZ);
		return rc ? rc : -EINVAL;
	}

	vcpudispatch_stats_freq = freq;

	return count;
}

static int vcpudispatch_stats_freq_display(struct seq_file *p, void *v)
{
	seq_printf(p, "%d\n", vcpudispatch_stats_freq);
	return 0;
}

static int vcpudispatch_stats_freq_open(struct inode *inode, struct file *file)
{
	return single_open(file, vcpudispatch_stats_freq_display, NULL);
}

static const struct file_operations vcpudispatch_stats_freq_proc_ops = {
	.open		= vcpudispatch_stats_freq_open,
	.read		= seq_read,
	.write		= vcpudispatch_stats_freq_write,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init vcpudispatch_stats_procfs_init(void)
{
	if (!lppaca_shared_proc(get_lppaca()))
		return 0;

	if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL,
					&vcpudispatch_stats_proc_ops))
		pr_err("vcpudispatch_stats: error creating procfs file\n");
	else if (!proc_create("powerpc/vcpudispatch_stats_freq", 0600, NULL,
					&vcpudispatch_stats_freq_proc_ops))
		pr_err("vcpudispatch_stats_freq: error creating procfs file\n");

	return 0;
}

machine_device_initcall(pseries, vcpudispatch_stats_procfs_init);
#endif /* CONFIG_PPC_SPLPAR */

void vpa_init(int cpu)
{
	int hwcpu = get_hard_smp_processor_id(cpu);
	unsigned long addr;
	long ret;

	/*
	 * The spec says it "may be problematic" if CPU x registers the VPA of
	 * CPU y. We should never do that, but wail if we ever do.
	 */
	WARN_ON(cpu != smp_processor_id());

	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		lppaca_of(cpu).vmxregs_in_use = 1;

	if (cpu_has_feature(CPU_FTR_ARCH_207S))
		lppaca_of(cpu).ebb_regs_in_use = 1;

	addr = __pa(&lppaca_of(cpu));
	ret = register_vpa(hwcpu, addr);

	if (ret) {
		pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
		       "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
		return;
	}

#ifdef CONFIG_PPC_BOOK3S_64
	/*
	 * PAPR says this feature is SLB-Buffer but firmware never
	 * reports that.  All SPLPAR support SLB shadow buffer.
	 */
	if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
		addr = __pa(paca_ptrs[cpu]->slb_shadow_ptr);
		ret = register_slb_shadow(hwcpu, addr);
		if (ret)
			pr_err("WARNING: SLB shadow buffer registration for "
			       "cpu %d (hw %d) of area %lx failed with %ld\n",
			       cpu, hwcpu, addr, ret);
	}
#endif /* CONFIG_PPC_BOOK3S_64 */

	/*
	 * Register dispatch trace log, if one has been allocated.
	 */
	register_dtl_buffer(cpu);
}

#ifdef CONFIG_PPC_BOOK3S_64

static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
				     unsigned long vpn, unsigned long pa,
				     unsigned long rflags, unsigned long vflags,
				     int psize, int apsize, int ssize)
{
	unsigned long lpar_rc;
	unsigned long flags;
	unsigned long slot;
	unsigned long hpte_v, hpte_r;

	if (!(vflags & HPTE_V_BOLTED))
		pr_devel("hpte_insert(group=%lx, vpn=%016lx, "
			 "pa=%016lx, rflags=%lx, vflags=%lx, psize=%d)\n",
			 hpte_group, vpn,  pa, rflags, vflags, psize);

	hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
	hpte_r = hpte_encode_r(pa, psize, apsize) | rflags;

	if (!(vflags & HPTE_V_BOLTED))
		pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);

	/* Now fill in the actual HPTE */
	/* Set CEC cookie to 0         */
	/* Zero page = 0               */
	/* I-cache Invalidate = 0      */
	/* I-cache synchronize = 0     */
	/* Exact = 0                   */
	flags = 0;

	if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
		flags |= H_COALESCE_CAND;

	lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
	if (unlikely(lpar_rc == H_PTEG_FULL)) {
		pr_devel("Hash table group is full\n");
		return -1;
	}

	/*
	 * Since we try and ioremap PHBs we don't own, the pte insert
	 * will fail. However we must catch the failure in hash_page
	 * or we will loop forever, so return -2 in this case.
	 */
	if (unlikely(lpar_rc != H_SUCCESS)) {
		pr_err("Failed hash pte insert with error %ld\n", lpar_rc);
		return -2;
	}
	if (!(vflags & HPTE_V_BOLTED))
		pr_devel(" -> slot: %lu\n", slot & 7);

	/* Because of iSeries, we have to pass down the secondary
	 * bucket bit here as well
	 */
	return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
}

static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);

static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
{
	unsigned long slot_offset;
	unsigned long lpar_rc;
	int i;
	unsigned long dummy1, dummy2;

	/* pick a random slot to start at */
	slot_offset = mftb() & 0x7;

	for (i = 0; i < HPTES_PER_GROUP; i++) {

		/* don't remove a bolted entry */
		lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
					   (0x1UL << 4), &dummy1, &dummy2);
		if (lpar_rc == H_SUCCESS)
			return i;

		/*
		 * The test for adjunct partition is performed before the
		 * ANDCOND test.  H_RESOURCE may be returned, so we need to
		 * check for that as well.
		 */
		BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);

		slot_offset++;
		slot_offset &= 0x7;
	}

	return -1;
}

static void manual_hpte_clear_all(void)
{
	unsigned long size_bytes = 1UL << ppc64_pft_size;
	unsigned long hpte_count = size_bytes >> 4;
	struct {
		unsigned long pteh;
		unsigned long ptel;
	} ptes[4];
	long lpar_rc;
	unsigned long i, j;

	/* Read in batches of 4,
	 * invalidate only valid entries not in the VRMA
	 * hpte_count will be a multiple of 4
         */
	for (i = 0; i < hpte_count; i += 4) {
		lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes);
		if (lpar_rc != H_SUCCESS) {
			pr_info("Failed to read hash page table at %ld err %ld\n",
				i, lpar_rc);
			continue;
		}
		for (j = 0; j < 4; j++){
			if ((ptes[j].pteh & HPTE_V_VRMA_MASK) ==
				HPTE_V_VRMA_MASK)
				continue;
			if (ptes[j].pteh & HPTE_V_VALID)
				plpar_pte_remove_raw(0, i + j, 0,
					&(ptes[j].pteh), &(ptes[j].ptel));
		}
	}
}

static int hcall_hpte_clear_all(void)
{
	int rc;

	do {
		rc = plpar_hcall_norets(H_CLEAR_HPT);
	} while (rc == H_CONTINUE);

	return rc;
}

static void pseries_hpte_clear_all(void)
{
	int rc;

	rc = hcall_hpte_clear_all();
	if (rc != H_SUCCESS)
		manual_hpte_clear_all();

#ifdef __LITTLE_ENDIAN__
	/*
	 * Reset exceptions to big endian.
	 *
	 * FIXME this is a hack for kexec, we need to reset the exception
	 * endian before starting the new kernel and this is a convenient place
	 * to do it.
	 *
	 * This is also called on boot when a fadump happens. In that case we
	 * must not change the exception endian mode.
	 */
	if (firmware_has_feature(FW_FEATURE_SET_MODE) && !is_fadump_active())
		pseries_big_endian_exceptions();
#endif
}

/*
 * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
 * the low 3 bits of flags happen to line up.  So no transform is needed.
 * We can probably optimize here and assume the high bits of newpp are
 * already zero.  For now I am paranoid.
 */
static long pSeries_lpar_hpte_updatepp(unsigned long slot,
				       unsigned long newpp,
				       unsigned long vpn,
				       int psize, int apsize,
				       int ssize, unsigned long inv_flags)
{
	unsigned long lpar_rc;
	unsigned long flags;
	unsigned long want_v;

	want_v = hpte_encode_avpn(vpn, psize, ssize);

	flags = (newpp & 7) | H_AVPN;
	if (mmu_has_feature(MMU_FTR_KERNEL_RO))
		/* Move pp0 into bit 8 (IBM 55) */
		flags |= (newpp & HPTE_R_PP0) >> 55;

	pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
		 want_v, slot, flags, psize);

	lpar_rc = plpar_pte_protect(flags, slot, want_v);

	if (lpar_rc == H_NOT_FOUND) {
		pr_devel("not found !\n");
		return -1;
	}

	pr_devel("ok\n");

	BUG_ON(lpar_rc != H_SUCCESS);

	return 0;
}

static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group)
{
	long lpar_rc;
	unsigned long i, j;
	struct {
		unsigned long pteh;
		unsigned long ptel;
	} ptes[4];

	for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {

		lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
		if (lpar_rc != H_SUCCESS) {
			pr_info("Failed to read hash page table at %ld err %ld\n",
				hpte_group, lpar_rc);
			continue;
		}

		for (j = 0; j < 4; j++) {
			if (HPTE_V_COMPARE(ptes[j].pteh, want_v) &&
			    (ptes[j].pteh & HPTE_V_VALID))
				return i + j;
		}
	}

	return -1;
}

static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize)
{
	long slot;
	unsigned long hash;
	unsigned long want_v;
	unsigned long hpte_group;

	hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize);
	want_v = hpte_encode_avpn(vpn, psize, ssize);

	/* Bolted entries are always in the primary group */
	hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
	slot = __pSeries_lpar_hpte_find(want_v, hpte_group);
	if (slot < 0)
		return -1;
	return hpte_group + slot;
}

static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
					     unsigned long ea,
					     int psize, int ssize)
{
	unsigned long vpn;
	unsigned long lpar_rc, slot, vsid, flags;

	vsid = get_kernel_vsid(ea, ssize);
	vpn = hpt_vpn(ea, vsid, ssize);

	slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
	BUG_ON(slot == -1);

	flags = newpp & 7;
	if (mmu_has_feature(MMU_FTR_KERNEL_RO))
		/* Move pp0 into bit 8 (IBM 55) */
		flags |= (newpp & HPTE_R_PP0) >> 55;

	lpar_rc = plpar_pte_protect(flags, slot, 0);

	BUG_ON(lpar_rc != H_SUCCESS);
}

static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
					 int psize, int apsize,
					 int ssize, int local)
{
	unsigned long want_v;
	unsigned long lpar_rc;
	unsigned long dummy1, dummy2;

	pr_devel("    inval : slot=%lx, vpn=%016lx, psize: %d, local: %d\n",
		 slot, vpn, psize, local);

	want_v = hpte_encode_avpn(vpn, psize, ssize);
	lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
	if (lpar_rc == H_NOT_FOUND)
		return;

	BUG_ON(lpar_rc != H_SUCCESS);
}


/*
 * As defined in the PAPR's section 14.5.4.1.8
 * The control mask doesn't include the returned reference and change bit from
 * the processed PTE.
 */
#define HBLKR_AVPN		0x0100000000000000UL
#define HBLKR_CTRL_MASK		0xf800000000000000UL
#define HBLKR_CTRL_SUCCESS	0x8000000000000000UL
#define HBLKR_CTRL_ERRNOTFOUND	0x8800000000000000UL
#define HBLKR_CTRL_ERRBUSY	0xa000000000000000UL

/*
 * Returned true if we are supporting this block size for the specified segment
 * base page size and actual page size.
 *
 * Currently, we only support 8 size block.
 */
static inline bool is_supported_hlbkrm(int bpsize, int psize)
{
	return (hblkrm_size[bpsize][psize] == HBLKRM_SUPPORTED_BLOCK_SIZE);
}

/**
 * H_BLOCK_REMOVE caller.
 * @idx should point to the latest @param entry set with a PTEX.
 * If PTE cannot be processed because another CPUs has already locked that
 * group, those entries are put back in @param starting at index 1.
 * If entries has to be retried and @retry_busy is set to true, these entries
 * are retried until success. If @retry_busy is set to false, the returned
 * is the number of entries yet to process.
 */
static unsigned long call_block_remove(unsigned long idx, unsigned long *param,
				       bool retry_busy)
{
	unsigned long i, rc, new_idx;
	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];

	if (idx < 2) {
		pr_warn("Unexpected empty call to H_BLOCK_REMOVE");
		return 0;
	}
again:
	new_idx = 0;
	if (idx > PLPAR_HCALL9_BUFSIZE) {
		pr_err("Too many PTEs (%lu) for H_BLOCK_REMOVE", idx);
		idx = PLPAR_HCALL9_BUFSIZE;
	} else if (idx < PLPAR_HCALL9_BUFSIZE)
		param[idx] = HBR_END;

	rc = plpar_hcall9(H_BLOCK_REMOVE, retbuf,
			  param[0], /* AVA */
			  param[1],  param[2],  param[3],  param[4], /* TS0-7 */
			  param[5],  param[6],  param[7],  param[8]);
	if (rc == H_SUCCESS)
		return 0;

	BUG_ON(rc != H_PARTIAL);

	/* Check that the unprocessed entries were 'not found' or 'busy' */
	for (i = 0; i < idx-1; i++) {
		unsigned long ctrl = retbuf[i] & HBLKR_CTRL_MASK;

		if (ctrl == HBLKR_CTRL_ERRBUSY) {
			param[++new_idx] = param[i+1];
			continue;
		}

		BUG_ON(ctrl != HBLKR_CTRL_SUCCESS
		       && ctrl != HBLKR_CTRL_ERRNOTFOUND);
	}

	/*
	 * If there were entries found busy, retry these entries if requested,
	 * of if all the entries have to be retried.
	 */
	if (new_idx && (retry_busy || new_idx == (PLPAR_HCALL9_BUFSIZE-1))) {
		idx = new_idx + 1;
		goto again;
	}

	return new_idx;
}

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/*
 * Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
 * to make sure that we avoid bouncing the hypervisor tlbie lock.
 */
#define PPC64_HUGE_HPTE_BATCH 12

static void hugepage_block_invalidate(unsigned long *slot, unsigned long *vpn,
				      int count, int psize, int ssize)
{
	unsigned long param[PLPAR_HCALL9_BUFSIZE];
	unsigned long shift, current_vpgb, vpgb;
	int i, pix = 0;

	shift = mmu_psize_defs[psize].shift;

	for (i = 0; i < count; i++) {
		/*
		 * Shifting 3 bits more on the right to get a
		 * 8 pages aligned virtual addresse.
		 */
		vpgb = (vpn[i] >> (shift - VPN_SHIFT + 3));
		if (!pix || vpgb != current_vpgb) {
			/*
			 * Need to start a new 8 pages block, flush
			 * the current one if needed.
			 */
			if (pix)
				(void)call_block_remove(pix, param, true);
			current_vpgb = vpgb;
			param[0] = hpte_encode_avpn(vpn[i], psize, ssize);
			pix = 1;
		}

		param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot[i];
		if (pix == PLPAR_HCALL9_BUFSIZE) {
			pix = call_block_remove(pix, param, false);
			/*
			 * pix = 0 means that all the entries were
			 * removed, we can start a new block.
			 * Otherwise, this means that there are entries
			 * to retry, and pix points to latest one, so
			 * we should increment it and try to continue
			 * the same block.
			 */
			if (pix)
				pix++;
		}
	}
	if (pix)
		(void)call_block_remove(pix, param, true);
}

static void hugepage_bulk_invalidate(unsigned long *slot, unsigned long *vpn,
				     int count, int psize, int ssize)
{
	unsigned long param[PLPAR_HCALL9_BUFSIZE];
	int i = 0, pix = 0, rc;

	for (i = 0; i < count; i++) {

		if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
			pSeries_lpar_hpte_invalidate(slot[i], vpn[i], psize, 0,
						     ssize, 0);
		} else {
			param[pix] = HBR_REQUEST | HBR_AVPN | slot[i];
			param[pix+1] = hpte_encode_avpn(vpn[i], psize, ssize);
			pix += 2;
			if (pix == 8) {
				rc = plpar_hcall9(H_BULK_REMOVE, param,
						  param[0], param[1], param[2],
						  param[3], param[4], param[5],
						  param[6], param[7]);
				BUG_ON(rc != H_SUCCESS);
				pix = 0;
			}
		}
	}
	if (pix) {
		param[pix] = HBR_END;
		rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
				  param[2], param[3], param[4], param[5],
				  param[6], param[7]);
		BUG_ON(rc != H_SUCCESS);
	}
}

static inline void __pSeries_lpar_hugepage_invalidate(unsigned long *slot,
						      unsigned long *vpn,
						      int count, int psize,
						      int ssize)
{
	unsigned long flags = 0;
	int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);

	if (lock_tlbie)
		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);

	/* Assuming THP size is 16M */
	if (is_supported_hlbkrm(psize, MMU_PAGE_16M))
		hugepage_block_invalidate(slot, vpn, count, psize, ssize);
	else
		hugepage_bulk_invalidate(slot, vpn, count, psize, ssize);

	if (lock_tlbie)
		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
}

static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
					     unsigned long addr,
					     unsigned char *hpte_slot_array,
					     int psize, int ssize, int local)
{
	int i, index = 0;
	unsigned long s_addr = addr;
	unsigned int max_hpte_count, valid;
	unsigned long vpn_array[PPC64_HUGE_HPTE_BATCH];
	unsigned long slot_array[PPC64_HUGE_HPTE_BATCH];
	unsigned long shift, hidx, vpn = 0, hash, slot;

	shift = mmu_psize_defs[psize].shift;
	max_hpte_count = 1U << (PMD_SHIFT - shift);

	for (i = 0; i < max_hpte_count; i++) {
		valid = hpte_valid(hpte_slot_array, i);
		if (!valid)
			continue;
		hidx =  hpte_hash_index(hpte_slot_array, i);

		/* get the vpn */
		addr = s_addr + (i * (1ul << shift));
		vpn = hpt_vpn(addr, vsid, ssize);
		hash = hpt_hash(vpn, shift, ssize);
		if (hidx & _PTEIDX_SECONDARY)
			hash = ~hash;

		slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
		slot += hidx & _PTEIDX_GROUP_IX;

		slot_array[index] = slot;
		vpn_array[index] = vpn;
		if (index == PPC64_HUGE_HPTE_BATCH - 1) {
			/*
			 * Now do a bluk invalidate
			 */
			__pSeries_lpar_hugepage_invalidate(slot_array,
							   vpn_array,
							   PPC64_HUGE_HPTE_BATCH,
							   psize, ssize);
			index = 0;
		} else
			index++;
	}
	if (index)
		__pSeries_lpar_hugepage_invalidate(slot_array, vpn_array,
						   index, psize, ssize);
}
#else
static void pSeries_lpar_hugepage_invalidate(unsigned long vsid,
					     unsigned long addr,
					     unsigned char *hpte_slot_array,
					     int psize, int ssize, int local)
{
	WARN(1, "%s called without THP support\n", __func__);
}
#endif

static int pSeries_lpar_hpte_removebolted(unsigned long ea,
					  int psize, int ssize)
{
	unsigned long vpn;
	unsigned long slot, vsid;

	vsid = get_kernel_vsid(ea, ssize);
	vpn = hpt_vpn(ea, vsid, ssize);

	slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
	if (slot == -1)
		return -ENOENT;

	/*
	 * lpar doesn't use the passed actual page size
	 */
	pSeries_lpar_hpte_invalidate(slot, vpn, psize, 0, ssize, 0);
	return 0;
}


static inline unsigned long compute_slot(real_pte_t pte,
					 unsigned long vpn,
					 unsigned long index,
					 unsigned long shift,
					 int ssize)
{
	unsigned long slot, hash, hidx;

	hash = hpt_hash(vpn, shift, ssize);
	hidx = __rpte_to_hidx(pte, index);
	if (hidx & _PTEIDX_SECONDARY)
		hash = ~hash;
	slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
	slot += hidx & _PTEIDX_GROUP_IX;
	return slot;
}

/**
 * The hcall H_BLOCK_REMOVE implies that the virtual pages to processed are
 * "all within the same naturally aligned 8 page virtual address block".
 */
static void do_block_remove(unsigned long number, struct ppc64_tlb_batch *batch,
			    unsigned long *param)
{
	unsigned long vpn;
	unsigned long i, pix = 0;
	unsigned long index, shift, slot, current_vpgb, vpgb;
	real_pte_t pte;
	int psize, ssize;

	psize = batch->psize;
	ssize = batch->ssize;

	for (i = 0; i < number; i++) {
		vpn = batch->vpn[i];
		pte = batch->pte[i];
		pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
			/*
			 * Shifting 3 bits more on the right to get a
			 * 8 pages aligned virtual addresse.
			 */
			vpgb = (vpn >> (shift - VPN_SHIFT + 3));
			if (!pix || vpgb != current_vpgb) {
				/*
				 * Need to start a new 8 pages block, flush
				 * the current one if needed.
				 */
				if (pix)
					(void)call_block_remove(pix, param,
								true);
				current_vpgb = vpgb;
				param[0] = hpte_encode_avpn(vpn, psize,
							    ssize);
				pix = 1;
			}

			slot = compute_slot(pte, vpn, index, shift, ssize);
			param[pix++] = HBR_REQUEST | HBLKR_AVPN | slot;

			if (pix == PLPAR_HCALL9_BUFSIZE) {
				pix = call_block_remove(pix, param, false);
				/*
				 * pix = 0 means that all the entries were
				 * removed, we can start a new block.
				 * Otherwise, this means that there are entries
				 * to retry, and pix points to latest one, so
				 * we should increment it and try to continue
				 * the same block.
				 */
				if (pix)
					pix++;
			}
		} pte_iterate_hashed_end();
	}

	if (pix)
		(void)call_block_remove(pix, param, true);
}

/*
 * TLB Block Invalidate Characteristics
 *
 * These characteristics define the size of the block the hcall H_BLOCK_REMOVE
 * is able to process for each couple segment base page size, actual page size.
 *
 * The ibm,get-system-parameter properties is returning a buffer with the
 * following layout:
 *
 * [ 2 bytes size of the RTAS buffer (excluding these 2 bytes) ]
 * -----------------
 * TLB Block Invalidate Specifiers:
 * [ 1 byte LOG base 2 of the TLB invalidate block size being specified ]
 * [ 1 byte Number of page sizes (N) that are supported for the specified
 *          TLB invalidate block size ]
 * [ 1 byte Encoded segment base page size and actual page size
 *          MSB=0 means 4k segment base page size and actual page size
 *          MSB=1 the penc value in mmu_psize_def ]
 * ...
 * -----------------
 * Next TLB Block Invalidate Specifiers...
 * -----------------
 * [ 0 ]
 */
static inline void set_hblkrm_bloc_size(int bpsize, int psize,
					unsigned int block_size)
{
	if (block_size > hblkrm_size[bpsize][psize])
		hblkrm_size[bpsize][psize] = block_size;
}

/*
 * Decode the Encoded segment base page size and actual page size.
 * PAPR specifies:
 *   - bit 7 is the L bit
 *   - bits 0-5 are the penc value
 * If the L bit is 0, this means 4K segment base page size and actual page size
 * otherwise the penc value should be read.
 */
#define HBLKRM_L_MASK		0x80
#define HBLKRM_PENC_MASK	0x3f
static inline void __init check_lp_set_hblkrm(unsigned int lp,
					      unsigned int block_size)
{
	unsigned int bpsize, psize;

	/* First, check the L bit, if not set, this means 4K */
	if ((lp & HBLKRM_L_MASK) == 0) {
		set_hblkrm_bloc_size(MMU_PAGE_4K, MMU_PAGE_4K, block_size);
		return;
	}

	lp &= HBLKRM_PENC_MASK;
	for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++) {
		struct mmu_psize_def *def = &mmu_psize_defs[bpsize];

		for (psize = 0; psize < MMU_PAGE_COUNT; psize++) {
			if (def->penc[psize] == lp) {
				set_hblkrm_bloc_size(bpsize, psize, block_size);
				return;
			}
		}
	}
}

#define SPLPAR_TLB_BIC_TOKEN		50

/*
 * The size of the TLB Block Invalidate Characteristics is variable. But at the
 * maximum it will be the number of possible page sizes *2 + 10 bytes.
 * Currently MMU_PAGE_COUNT is 16, which means 42 bytes. Use a cache line size
 * (128 bytes) for the buffer to get plenty of space.
 */
#define SPLPAR_TLB_BIC_MAXLENGTH	128

void __init pseries_lpar_read_hblkrm_characteristics(void)
{
	unsigned char local_buffer[SPLPAR_TLB_BIC_MAXLENGTH];
	int call_status, len, idx, bpsize;

	spin_lock(&rtas_data_buf_lock);
	memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
				NULL,
				SPLPAR_TLB_BIC_TOKEN,
				__pa(rtas_data_buf),
				RTAS_DATA_BUF_SIZE);
	memcpy(local_buffer, rtas_data_buf, SPLPAR_TLB_BIC_MAXLENGTH);
	local_buffer[SPLPAR_TLB_BIC_MAXLENGTH - 1] = '\0';
	spin_unlock(&rtas_data_buf_lock);

	if (call_status != 0) {
		pr_warn("%s %s Error calling get-system-parameter (0x%x)\n",
			__FILE__, __func__, call_status);
		return;
	}

	/*
	 * The first two (2) bytes of the data in the buffer are the length of
	 * the returned data, not counting these first two (2) bytes.
	 */
	len = be16_to_cpu(*((u16 *)local_buffer)) + 2;
	if (len > SPLPAR_TLB_BIC_MAXLENGTH) {
		pr_warn("%s too large returned buffer %d", __func__, len);
		return;
	}

	idx = 2;
	while (idx < len) {
		u8 block_shift = local_buffer[idx++];
		u32 block_size;
		unsigned int npsize;

		if (!block_shift)
			break;

		block_size = 1 << block_shift;

		for (npsize = local_buffer[idx++];
		     npsize > 0 && idx < len; npsize--)
			check_lp_set_hblkrm((unsigned int) local_buffer[idx++],
					    block_size);
	}

	for (bpsize = 0; bpsize < MMU_PAGE_COUNT; bpsize++)
		for (idx = 0; idx < MMU_PAGE_COUNT; idx++)
			if (hblkrm_size[bpsize][idx])
				pr_info("H_BLOCK_REMOVE supports base psize:%d psize:%d block size:%d",
					bpsize, idx, hblkrm_size[bpsize][idx]);
}

/*
 * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
 * lock.
 */
static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
{
	unsigned long vpn;
	unsigned long i, pix, rc;
	unsigned long flags = 0;
	struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
	int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
	unsigned long param[PLPAR_HCALL9_BUFSIZE];
	unsigned long index, shift, slot;
	real_pte_t pte;
	int psize, ssize;

	if (lock_tlbie)
		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);

	if (is_supported_hlbkrm(batch->psize, batch->psize)) {
		do_block_remove(number, batch, param);
		goto out;
	}

	psize = batch->psize;
	ssize = batch->ssize;
	pix = 0;
	for (i = 0; i < number; i++) {
		vpn = batch->vpn[i];
		pte = batch->pte[i];
		pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
			slot = compute_slot(pte, vpn, index, shift, ssize);
			if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
				/*
				 * lpar doesn't use the passed actual page size
				 */
				pSeries_lpar_hpte_invalidate(slot, vpn, psize,
							     0, ssize, local);
			} else {
				param[pix] = HBR_REQUEST | HBR_AVPN | slot;
				param[pix+1] = hpte_encode_avpn(vpn, psize,
								ssize);
				pix += 2;
				if (pix == 8) {
					rc = plpar_hcall9(H_BULK_REMOVE, param,
						param[0], param[1], param[2],
						param[3], param[4], param[5],
						param[6], param[7]);
					BUG_ON(rc != H_SUCCESS);
					pix = 0;
				}
			}
		} pte_iterate_hashed_end();
	}
	if (pix) {
		param[pix] = HBR_END;
		rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
				  param[2], param[3], param[4], param[5],
				  param[6], param[7]);
		BUG_ON(rc != H_SUCCESS);
	}

out:
	if (lock_tlbie)
		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
}

static int __init disable_bulk_remove(char *str)
{
	if (strcmp(str, "off") == 0 &&
	    firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
		pr_info("Disabling BULK_REMOVE firmware feature");
		powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
	}
	return 1;
}

__setup("bulk_remove=", disable_bulk_remove);

#define HPT_RESIZE_TIMEOUT	10000 /* ms */

struct hpt_resize_state {
	unsigned long shift;
	int commit_rc;
};

static int pseries_lpar_resize_hpt_commit(void *data)
{
	struct hpt_resize_state *state = data;

	state->commit_rc = plpar_resize_hpt_commit(0, state->shift);
	if (state->commit_rc != H_SUCCESS)
		return -EIO;

	/* Hypervisor has transitioned the HTAB, update our globals */
	ppc64_pft_size = state->shift;
	htab_size_bytes = 1UL << ppc64_pft_size;
	htab_hash_mask = (htab_size_bytes >> 7) - 1;

	return 0;
}

/*
 * Must be called in process context. The caller must hold the
 * cpus_lock.
 */
static int pseries_lpar_resize_hpt(unsigned long shift)
{
	struct hpt_resize_state state = {
		.shift = shift,
		.commit_rc = H_FUNCTION,
	};
	unsigned int delay, total_delay = 0;
	int rc;
	ktime_t t0, t1, t2;

	might_sleep();

	if (!firmware_has_feature(FW_FEATURE_HPT_RESIZE))
		return -ENODEV;

	pr_info("Attempting to resize HPT to shift %lu\n", shift);

	t0 = ktime_get();

	rc = plpar_resize_hpt_prepare(0, shift);
	while (H_IS_LONG_BUSY(rc)) {
		delay = get_longbusy_msecs(rc);
		total_delay += delay;
		if (total_delay > HPT_RESIZE_TIMEOUT) {
			/* prepare with shift==0 cancels an in-progress resize */
			rc = plpar_resize_hpt_prepare(0, 0);
			if (rc != H_SUCCESS)
				pr_warn("Unexpected error %d cancelling timed out HPT resize\n",
				       rc);
			return -ETIMEDOUT;
		}
		msleep(delay);
		rc = plpar_resize_hpt_prepare(0, shift);
	};

	switch (rc) {
	case H_SUCCESS:
		/* Continue on */
		break;

	case H_PARAMETER:
		pr_warn("Invalid argument from H_RESIZE_HPT_PREPARE\n");
		return -EINVAL;
	case H_RESOURCE:
		pr_warn("Operation not permitted from H_RESIZE_HPT_PREPARE\n");
		return -EPERM;
	default:
		pr_warn("Unexpected error %d from H_RESIZE_HPT_PREPARE\n", rc);
		return -EIO;
	}

	t1 = ktime_get();

	rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit,
				     &state, NULL);

	t2 = ktime_get();

	if (rc != 0) {
		switch (state.commit_rc) {
		case H_PTEG_FULL:
			return -ENOSPC;

		default:
			pr_warn("Unexpected error %d from H_RESIZE_HPT_COMMIT\n",
				state.commit_rc);
			return -EIO;
		};
	}

	pr_info("HPT resize to shift %lu complete (%lld ms / %lld ms)\n",
		shift, (long long) ktime_ms_delta(t1, t0),
		(long long) ktime_ms_delta(t2, t1));

	return 0;
}

static int pseries_lpar_register_process_table(unsigned long base,
			unsigned long page_size, unsigned long table_size)
{
	long rc;
	unsigned long flags = 0;

	if (table_size)
		flags |= PROC_TABLE_NEW;
	if (radix_enabled())
		flags |= PROC_TABLE_RADIX | PROC_TABLE_GTSE;
	else
		flags |= PROC_TABLE_HPT_SLB;
	for (;;) {
		rc = plpar_hcall_norets(H_REGISTER_PROC_TBL, flags, base,
					page_size, table_size);
		if (!H_IS_LONG_BUSY(rc))
			break;
		mdelay(get_longbusy_msecs(rc));
	}
	if (rc != H_SUCCESS) {
		pr_err("Failed to register process table (rc=%ld)\n", rc);
		BUG();
	}
	return rc;
}

void __init hpte_init_pseries(void)
{
	mmu_hash_ops.hpte_invalidate	 = pSeries_lpar_hpte_invalidate;
	mmu_hash_ops.hpte_updatepp	 = pSeries_lpar_hpte_updatepp;
	mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
	mmu_hash_ops.hpte_insert	 = pSeries_lpar_hpte_insert;
	mmu_hash_ops.hpte_remove	 = pSeries_lpar_hpte_remove;
	mmu_hash_ops.hpte_removebolted   = pSeries_lpar_hpte_removebolted;
	mmu_hash_ops.flush_hash_range	 = pSeries_lpar_flush_hash_range;
	mmu_hash_ops.hpte_clear_all      = pseries_hpte_clear_all;
	mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;

	if (firmware_has_feature(FW_FEATURE_HPT_RESIZE))
		mmu_hash_ops.resize_hpt = pseries_lpar_resize_hpt;

	/*
	 * On POWER9, we need to do a H_REGISTER_PROC_TBL hcall
	 * to inform the hypervisor that we wish to use the HPT.
	 */
	if (cpu_has_feature(CPU_FTR_ARCH_300))
		pseries_lpar_register_process_table(0, 0, 0);
}

void radix_init_pseries(void)
{
	pr_info("Using radix MMU under hypervisor\n");

	pseries_lpar_register_process_table(__pa(process_tb),
						0, PRTB_SIZE_SHIFT - 12);
}

#ifdef CONFIG_PPC_SMLPAR
#define CMO_FREE_HINT_DEFAULT 1
static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;

static int __init cmo_free_hint(char *str)
{
	char *parm;
	parm = strstrip(str);

	if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
		pr_info("%s: CMO free page hinting is not active.\n", __func__);
		cmo_free_hint_flag = 0;
		return 1;
	}

	cmo_free_hint_flag = 1;
	pr_info("%s: CMO free page hinting is active.\n", __func__);

	if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
		return 1;

	return 0;
}

__setup("cmo_free_hint=", cmo_free_hint);

static void pSeries_set_page_state(struct page *page, int order,
				   unsigned long state)
{
	int i, j;
	unsigned long cmo_page_sz, addr;

	cmo_page_sz = cmo_get_page_size();
	addr = __pa((unsigned long)page_address(page));

	for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
		for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
			plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
	}
}

void arch_free_page(struct page *page, int order)
{
	if (radix_enabled())
		return;
	if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
		return;

	pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
}
EXPORT_SYMBOL(arch_free_page);

#endif /* CONFIG_PPC_SMLPAR */
#endif /* CONFIG_PPC_BOOK3S_64 */

#ifdef CONFIG_TRACEPOINTS
#ifdef CONFIG_JUMP_LABEL
struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;

int hcall_tracepoint_regfunc(void)
{
	static_key_slow_inc(&hcall_tracepoint_key);
	return 0;
}

void hcall_tracepoint_unregfunc(void)
{
	static_key_slow_dec(&hcall_tracepoint_key);
}
#else
/*
 * We optimise our hcall path by placing hcall_tracepoint_refcount
 * directly in the TOC so we can check if the hcall tracepoints are
 * enabled via a single load.
 */

/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
extern long hcall_tracepoint_refcount;

int hcall_tracepoint_regfunc(void)
{
	hcall_tracepoint_refcount++;
	return 0;
}

void hcall_tracepoint_unregfunc(void)
{
	hcall_tracepoint_refcount--;
}
#endif

/*
 * Since the tracing code might execute hcalls we need to guard against
 * recursion. One example of this are spinlocks calling H_YIELD on
 * shared processor partitions.
 */
static DEFINE_PER_CPU(unsigned int, hcall_trace_depth);


void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
{
	unsigned long flags;
	unsigned int *depth;

	/*
	 * We cannot call tracepoints inside RCU idle regions which
	 * means we must not trace H_CEDE.
	 */
	if (opcode == H_CEDE)
		return;

	local_irq_save(flags);

	depth = this_cpu_ptr(&hcall_trace_depth);

	if (*depth)
		goto out;

	(*depth)++;
	preempt_disable();
	trace_hcall_entry(opcode, args);
	(*depth)--;

out:
	local_irq_restore(flags);
}

void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf)
{
	unsigned long flags;
	unsigned int *depth;

	if (opcode == H_CEDE)
		return;

	local_irq_save(flags);

	depth = this_cpu_ptr(&hcall_trace_depth);

	if (*depth)
		goto out;

	(*depth)++;
	trace_hcall_exit(opcode, retval, retbuf);
	preempt_enable();
	(*depth)--;

out:
	local_irq_restore(flags);
}
#endif

/**
 * h_get_mpp
 * H_GET_MPP hcall returns info in 7 parms
 */
int h_get_mpp(struct hvcall_mpp_data *mpp_data)
{
	int rc;
	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];

	rc = plpar_hcall9(H_GET_MPP, retbuf);

	mpp_data->entitled_mem = retbuf[0];
	mpp_data->mapped_mem = retbuf[1];

	mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
	mpp_data->pool_num = retbuf[2] & 0xffff;

	mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
	mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
	mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffffUL;

	mpp_data->pool_size = retbuf[4];
	mpp_data->loan_request = retbuf[5];
	mpp_data->backing_mem = retbuf[6];

	return rc;
}
EXPORT_SYMBOL(h_get_mpp);

int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
{
	int rc;
	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };

	rc = plpar_hcall9(H_GET_MPP_X, retbuf);

	mpp_x_data->coalesced_bytes = retbuf[0];
	mpp_x_data->pool_coalesced_bytes = retbuf[1];
	mpp_x_data->pool_purr_cycles = retbuf[2];
	mpp_x_data->pool_spurr_cycles = retbuf[3];

	return rc;
}

static unsigned long vsid_unscramble(unsigned long vsid, int ssize)
{
	unsigned long protovsid;
	unsigned long va_bits = VA_BITS;
	unsigned long modinv, vsid_modulus;
	unsigned long max_mod_inv, tmp_modinv;

	if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
		va_bits = 65;

	if (ssize == MMU_SEGSIZE_256M) {
		modinv = VSID_MULINV_256M;
		vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1);
	} else {
		modinv = VSID_MULINV_1T;
		vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1);
	}

	/*
	 * vsid outside our range.
	 */
	if (vsid >= vsid_modulus)
		return 0;

	/*
	 * If modinv is the modular multiplicate inverse of (x % vsid_modulus)
	 * and vsid = (protovsid * x) % vsid_modulus, then we say:
	 *   protovsid = (vsid * modinv) % vsid_modulus
	 */

	/* Check if (vsid * modinv) overflow (63 bits) */
	max_mod_inv = 0x7fffffffffffffffull / vsid;
	if (modinv < max_mod_inv)
		return (vsid * modinv) % vsid_modulus;

	tmp_modinv = modinv/max_mod_inv;
	modinv %= max_mod_inv;

	protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus;
	protovsid = (protovsid + vsid * modinv) % vsid_modulus;

	return protovsid;
}

static int __init reserve_vrma_context_id(void)
{
	unsigned long protovsid;

	/*
	 * Reserve context ids which map to reserved virtual addresses. For now
	 * we only reserve the context id which maps to the VRMA VSID. We ignore
	 * the addresses in "ibm,adjunct-virtual-addresses" because we don't
	 * enable adjunct support via the "ibm,client-architecture-support"
	 * interface.
	 */
	protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T);
	hash__reserve_context_id(protovsid >> ESID_BITS_1T);
	return 0;
}
machine_device_initcall(pseries, reserve_vrma_context_id);

#ifdef CONFIG_DEBUG_FS
/* debugfs file interface for vpa data */
static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len,
			      loff_t *pos)
{
	int cpu = (long)filp->private_data;
	struct lppaca *lppaca = &lppaca_of(cpu);

	return simple_read_from_buffer(buf, len, pos, lppaca,
				sizeof(struct lppaca));
}

static const struct file_operations vpa_fops = {
	.open		= simple_open,
	.read		= vpa_file_read,
	.llseek		= default_llseek,
};

static int __init vpa_debugfs_init(void)
{
	char name[16];
	long i;
	static struct dentry *vpa_dir;

	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
		return 0;

	vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root);
	if (!vpa_dir) {
		pr_warn("%s: can't create vpa root dir\n", __func__);
		return -ENOMEM;
	}

	/* set up the per-cpu vpa file*/
	for_each_possible_cpu(i) {
		struct dentry *d;

		sprintf(name, "cpu-%ld", i);

		d = debugfs_create_file(name, 0400, vpa_dir, (void *)i,
					&vpa_fops);
		if (!d) {
			pr_warn("%s: can't create per-cpu vpa file\n",
					__func__);
			return -ENOMEM;
		}
	}

	return 0;
}
machine_arch_initcall(pseries, vpa_debugfs_init);
#endif /* CONFIG_DEBUG_FS */