summaryrefslogtreecommitdiff
path: root/tools/perf/util/evlist.c
blob: f2d478df8c3e40bcc661ace6d54c94a0189855da (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
/*
 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Parts came from builtin-{top,stat,record}.c, see those files for further
 * copyright notes.
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */
#include "util.h"
#include <api/fs/fs.h>
#include <poll.h>
#include "cpumap.h"
#include "thread_map.h"
#include "target.h"
#include "evlist.h"
#include "evsel.h"
#include "debug.h"
#include <unistd.h>

#include "parse-events.h"
#include <subcmd/parse-options.h>

#include <sys/mman.h>

#include <linux/bitops.h>
#include <linux/hash.h>
#include <linux/log2.h>
#include <linux/err.h>

static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);

#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)

void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
		       struct thread_map *threads)
{
	int i;

	for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
		INIT_HLIST_HEAD(&evlist->heads[i]);
	INIT_LIST_HEAD(&evlist->entries);
	perf_evlist__set_maps(evlist, cpus, threads);
	fdarray__init(&evlist->pollfd, 64);
	evlist->workload.pid = -1;
	evlist->backward = false;
}

struct perf_evlist *perf_evlist__new(void)
{
	struct perf_evlist *evlist = zalloc(sizeof(*evlist));

	if (evlist != NULL)
		perf_evlist__init(evlist, NULL, NULL);

	return evlist;
}

struct perf_evlist *perf_evlist__new_default(void)
{
	struct perf_evlist *evlist = perf_evlist__new();

	if (evlist && perf_evlist__add_default(evlist)) {
		perf_evlist__delete(evlist);
		evlist = NULL;
	}

	return evlist;
}

struct perf_evlist *perf_evlist__new_dummy(void)
{
	struct perf_evlist *evlist = perf_evlist__new();

	if (evlist && perf_evlist__add_dummy(evlist)) {
		perf_evlist__delete(evlist);
		evlist = NULL;
	}

	return evlist;
}

/**
 * perf_evlist__set_id_pos - set the positions of event ids.
 * @evlist: selected event list
 *
 * Events with compatible sample types all have the same id_pos
 * and is_pos.  For convenience, put a copy on evlist.
 */
void perf_evlist__set_id_pos(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist);

	evlist->id_pos = first->id_pos;
	evlist->is_pos = first->is_pos;
}

static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel)
		perf_evsel__calc_id_pos(evsel);

	perf_evlist__set_id_pos(evlist);
}

static void perf_evlist__purge(struct perf_evlist *evlist)
{
	struct perf_evsel *pos, *n;

	evlist__for_each_entry_safe(evlist, n, pos) {
		list_del_init(&pos->node);
		pos->evlist = NULL;
		perf_evsel__delete(pos);
	}

	evlist->nr_entries = 0;
}

void perf_evlist__exit(struct perf_evlist *evlist)
{
	zfree(&evlist->mmap);
	fdarray__exit(&evlist->pollfd);
}

void perf_evlist__delete(struct perf_evlist *evlist)
{
	if (evlist == NULL)
		return;

	perf_evlist__munmap(evlist);
	perf_evlist__close(evlist);
	cpu_map__put(evlist->cpus);
	thread_map__put(evlist->threads);
	evlist->cpus = NULL;
	evlist->threads = NULL;
	perf_evlist__purge(evlist);
	perf_evlist__exit(evlist);
	free(evlist);
}

static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
					  struct perf_evsel *evsel)
{
	/*
	 * We already have cpus for evsel (via PMU sysfs) so
	 * keep it, if there's no target cpu list defined.
	 */
	if (!evsel->own_cpus || evlist->has_user_cpus) {
		cpu_map__put(evsel->cpus);
		evsel->cpus = cpu_map__get(evlist->cpus);
	} else if (evsel->cpus != evsel->own_cpus) {
		cpu_map__put(evsel->cpus);
		evsel->cpus = cpu_map__get(evsel->own_cpus);
	}

	thread_map__put(evsel->threads);
	evsel->threads = thread_map__get(evlist->threads);
}

static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel)
		__perf_evlist__propagate_maps(evlist, evsel);
}

void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
{
	entry->evlist = evlist;
	list_add_tail(&entry->node, &evlist->entries);
	entry->idx = evlist->nr_entries;
	entry->tracking = !entry->idx;

	if (!evlist->nr_entries++)
		perf_evlist__set_id_pos(evlist);

	__perf_evlist__propagate_maps(evlist, entry);
}

void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel)
{
	evsel->evlist = NULL;
	list_del_init(&evsel->node);
	evlist->nr_entries -= 1;
}

void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
				   struct list_head *list)
{
	struct perf_evsel *evsel, *temp;

	__evlist__for_each_entry_safe(list, temp, evsel) {
		list_del_init(&evsel->node);
		perf_evlist__add(evlist, evsel);
	}
}

void __perf_evlist__set_leader(struct list_head *list)
{
	struct perf_evsel *evsel, *leader;

	leader = list_entry(list->next, struct perf_evsel, node);
	evsel = list_entry(list->prev, struct perf_evsel, node);

	leader->nr_members = evsel->idx - leader->idx + 1;

	__evlist__for_each_entry(list, evsel) {
		evsel->leader = leader;
	}
}

void perf_evlist__set_leader(struct perf_evlist *evlist)
{
	if (evlist->nr_entries) {
		evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
		__perf_evlist__set_leader(&evlist->entries);
	}
}

void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr)
{
	attr->precise_ip = 3;

	while (attr->precise_ip != 0) {
		int fd = sys_perf_event_open(attr, 0, -1, -1, 0);
		if (fd != -1) {
			close(fd);
			break;
		}
		--attr->precise_ip;
	}
}

int perf_evlist__add_default(struct perf_evlist *evlist)
{
	struct perf_event_attr attr = {
		.type = PERF_TYPE_HARDWARE,
		.config = PERF_COUNT_HW_CPU_CYCLES,
	};
	struct perf_evsel *evsel;

	event_attr_init(&attr);

	perf_event_attr__set_max_precise_ip(&attr);

	evsel = perf_evsel__new(&attr);
	if (evsel == NULL)
		goto error;

	/* use asprintf() because free(evsel) assumes name is allocated */
	if (asprintf(&evsel->name, "cycles%.*s",
		     attr.precise_ip ? attr.precise_ip + 1 : 0, ":ppp") < 0)
		goto error_free;

	perf_evlist__add(evlist, evsel);
	return 0;
error_free:
	perf_evsel__delete(evsel);
error:
	return -ENOMEM;
}

int perf_evlist__add_dummy(struct perf_evlist *evlist)
{
	struct perf_event_attr attr = {
		.type	= PERF_TYPE_SOFTWARE,
		.config = PERF_COUNT_SW_DUMMY,
		.size	= sizeof(attr), /* to capture ABI version */
	};
	struct perf_evsel *evsel = perf_evsel__new(&attr);

	if (evsel == NULL)
		return -ENOMEM;

	perf_evlist__add(evlist, evsel);
	return 0;
}

static int perf_evlist__add_attrs(struct perf_evlist *evlist,
				  struct perf_event_attr *attrs, size_t nr_attrs)
{
	struct perf_evsel *evsel, *n;
	LIST_HEAD(head);
	size_t i;

	for (i = 0; i < nr_attrs; i++) {
		evsel = perf_evsel__new_idx(attrs + i, evlist->nr_entries + i);
		if (evsel == NULL)
			goto out_delete_partial_list;
		list_add_tail(&evsel->node, &head);
	}

	perf_evlist__splice_list_tail(evlist, &head);

	return 0;

out_delete_partial_list:
	__evlist__for_each_entry_safe(&head, n, evsel)
		perf_evsel__delete(evsel);
	return -1;
}

int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
				     struct perf_event_attr *attrs, size_t nr_attrs)
{
	size_t i;

	for (i = 0; i < nr_attrs; i++)
		event_attr_init(attrs + i);

	return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
}

struct perf_evsel *
perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id)
{
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel) {
		if (evsel->attr.type   == PERF_TYPE_TRACEPOINT &&
		    (int)evsel->attr.config == id)
			return evsel;
	}

	return NULL;
}

struct perf_evsel *
perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
				     const char *name)
{
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel) {
		if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
		    (strcmp(evsel->name, name) == 0))
			return evsel;
	}

	return NULL;
}

int perf_evlist__add_newtp(struct perf_evlist *evlist,
			   const char *sys, const char *name, void *handler)
{
	struct perf_evsel *evsel = perf_evsel__newtp(sys, name);

	if (IS_ERR(evsel))
		return -1;

	evsel->handler = handler;
	perf_evlist__add(evlist, evsel);
	return 0;
}

static int perf_evlist__nr_threads(struct perf_evlist *evlist,
				   struct perf_evsel *evsel)
{
	if (evsel->system_wide)
		return 1;
	else
		return thread_map__nr(evlist->threads);
}

void perf_evlist__disable(struct perf_evlist *evlist)
{
	struct perf_evsel *pos;

	evlist__for_each_entry(evlist, pos) {
		if (!perf_evsel__is_group_leader(pos) || !pos->fd)
			continue;
		perf_evsel__disable(pos);
	}

	evlist->enabled = false;
}

void perf_evlist__enable(struct perf_evlist *evlist)
{
	struct perf_evsel *pos;

	evlist__for_each_entry(evlist, pos) {
		if (!perf_evsel__is_group_leader(pos) || !pos->fd)
			continue;
		perf_evsel__enable(pos);
	}

	evlist->enabled = true;
}

void perf_evlist__toggle_enable(struct perf_evlist *evlist)
{
	(evlist->enabled ? perf_evlist__disable : perf_evlist__enable)(evlist);
}

static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
					 struct perf_evsel *evsel, int cpu)
{
	int thread, err;
	int nr_threads = perf_evlist__nr_threads(evlist, evsel);

	if (!evsel->fd)
		return -EINVAL;

	for (thread = 0; thread < nr_threads; thread++) {
		err = ioctl(FD(evsel, cpu, thread),
			    PERF_EVENT_IOC_ENABLE, 0);
		if (err)
			return err;
	}
	return 0;
}

static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
					    struct perf_evsel *evsel,
					    int thread)
{
	int cpu, err;
	int nr_cpus = cpu_map__nr(evlist->cpus);

	if (!evsel->fd)
		return -EINVAL;

	for (cpu = 0; cpu < nr_cpus; cpu++) {
		err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
		if (err)
			return err;
	}
	return 0;
}

int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
				  struct perf_evsel *evsel, int idx)
{
	bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);

	if (per_cpu_mmaps)
		return perf_evlist__enable_event_cpu(evlist, evsel, idx);
	else
		return perf_evlist__enable_event_thread(evlist, evsel, idx);
}

int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
{
	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);
	int nfds = 0;
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel) {
		if (evsel->system_wide)
			nfds += nr_cpus;
		else
			nfds += nr_cpus * nr_threads;
	}

	if (fdarray__available_entries(&evlist->pollfd) < nfds &&
	    fdarray__grow(&evlist->pollfd, nfds) < 0)
		return -ENOMEM;

	return 0;
}

static int __perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd, int idx, short revent)
{
	int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP);
	/*
	 * Save the idx so that when we filter out fds POLLHUP'ed we can
	 * close the associated evlist->mmap[] entry.
	 */
	if (pos >= 0) {
		evlist->pollfd.priv[pos].idx = idx;

		fcntl(fd, F_SETFL, O_NONBLOCK);
	}

	return pos;
}

int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
{
	return __perf_evlist__add_pollfd(evlist, fd, -1, POLLIN);
}

static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
					 void *arg __maybe_unused)
{
	struct perf_evlist *evlist = container_of(fda, struct perf_evlist, pollfd);

	perf_evlist__mmap_put(evlist, fda->priv[fd].idx);
}

int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
{
	return fdarray__filter(&evlist->pollfd, revents_and_mask,
			       perf_evlist__munmap_filtered, NULL);
}

int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
{
	return fdarray__poll(&evlist->pollfd, timeout);
}

static void perf_evlist__id_hash(struct perf_evlist *evlist,
				 struct perf_evsel *evsel,
				 int cpu, int thread, u64 id)
{
	int hash;
	struct perf_sample_id *sid = SID(evsel, cpu, thread);

	sid->id = id;
	sid->evsel = evsel;
	hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
	hlist_add_head(&sid->node, &evlist->heads[hash]);
}

void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
			 int cpu, int thread, u64 id)
{
	perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
	evsel->id[evsel->ids++] = id;
}

int perf_evlist__id_add_fd(struct perf_evlist *evlist,
			   struct perf_evsel *evsel,
			   int cpu, int thread, int fd)
{
	u64 read_data[4] = { 0, };
	int id_idx = 1; /* The first entry is the counter value */
	u64 id;
	int ret;

	ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
	if (!ret)
		goto add;

	if (errno != ENOTTY)
		return -1;

	/* Legacy way to get event id.. All hail to old kernels! */

	/*
	 * This way does not work with group format read, so bail
	 * out in that case.
	 */
	if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
		return -1;

	if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
	    read(fd, &read_data, sizeof(read_data)) == -1)
		return -1;

	if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
		++id_idx;
	if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
		++id_idx;

	id = read_data[id_idx];

 add:
	perf_evlist__id_add(evlist, evsel, cpu, thread, id);
	return 0;
}

static void perf_evlist__set_sid_idx(struct perf_evlist *evlist,
				     struct perf_evsel *evsel, int idx, int cpu,
				     int thread)
{
	struct perf_sample_id *sid = SID(evsel, cpu, thread);
	sid->idx = idx;
	if (evlist->cpus && cpu >= 0)
		sid->cpu = evlist->cpus->map[cpu];
	else
		sid->cpu = -1;
	if (!evsel->system_wide && evlist->threads && thread >= 0)
		sid->tid = thread_map__pid(evlist->threads, thread);
	else
		sid->tid = -1;
}

struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id)
{
	struct hlist_head *head;
	struct perf_sample_id *sid;
	int hash;

	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
	head = &evlist->heads[hash];

	hlist_for_each_entry(sid, head, node)
		if (sid->id == id)
			return sid;

	return NULL;
}

struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
{
	struct perf_sample_id *sid;

	if (evlist->nr_entries == 1 || !id)
		return perf_evlist__first(evlist);

	sid = perf_evlist__id2sid(evlist, id);
	if (sid)
		return sid->evsel;

	if (!perf_evlist__sample_id_all(evlist))
		return perf_evlist__first(evlist);

	return NULL;
}

struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
						u64 id)
{
	struct perf_sample_id *sid;

	if (!id)
		return NULL;

	sid = perf_evlist__id2sid(evlist, id);
	if (sid)
		return sid->evsel;

	return NULL;
}

static int perf_evlist__event2id(struct perf_evlist *evlist,
				 union perf_event *event, u64 *id)
{
	const u64 *array = event->sample.array;
	ssize_t n;

	n = (event->header.size - sizeof(event->header)) >> 3;

	if (event->header.type == PERF_RECORD_SAMPLE) {
		if (evlist->id_pos >= n)
			return -1;
		*id = array[evlist->id_pos];
	} else {
		if (evlist->is_pos > n)
			return -1;
		n -= evlist->is_pos;
		*id = array[n];
	}
	return 0;
}

static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
						   union perf_event *event)
{
	struct perf_evsel *first = perf_evlist__first(evlist);
	struct hlist_head *head;
	struct perf_sample_id *sid;
	int hash;
	u64 id;

	if (evlist->nr_entries == 1)
		return first;

	if (!first->attr.sample_id_all &&
	    event->header.type != PERF_RECORD_SAMPLE)
		return first;

	if (perf_evlist__event2id(evlist, event, &id))
		return NULL;

	/* Synthesized events have an id of zero */
	if (!id)
		return first;

	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
	head = &evlist->heads[hash];

	hlist_for_each_entry(sid, head, node) {
		if (sid->id == id)
			return sid->evsel;
	}
	return NULL;
}

static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
{
	int i;

	for (i = 0; i < evlist->nr_mmaps; i++) {
		int fd = evlist->mmap[i].fd;
		int err;

		if (fd < 0)
			continue;
		err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
		if (err)
			return err;
	}
	return 0;
}

int perf_evlist__pause(struct perf_evlist *evlist)
{
	return perf_evlist__set_paused(evlist, true);
}

int perf_evlist__resume(struct perf_evlist *evlist)
{
	return perf_evlist__set_paused(evlist, false);
}

/* When check_messup is true, 'end' must points to a good entry */
static union perf_event *
perf_mmap__read(struct perf_mmap *md, bool check_messup, u64 start,
		u64 end, u64 *prev)
{
	unsigned char *data = md->base + page_size;
	union perf_event *event = NULL;
	int diff = end - start;

	if (check_messup) {
		/*
		 * If we're further behind than half the buffer, there's a chance
		 * the writer will bite our tail and mess up the samples under us.
		 *
		 * If we somehow ended up ahead of the 'end', we got messed up.
		 *
		 * In either case, truncate and restart at 'end'.
		 */
		if (diff > md->mask / 2 || diff < 0) {
			fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");

			/*
			 * 'end' points to a known good entry, start there.
			 */
			start = end;
			diff = 0;
		}
	}

	if (diff >= (int)sizeof(event->header)) {
		size_t size;

		event = (union perf_event *)&data[start & md->mask];
		size = event->header.size;

		if (size < sizeof(event->header) || diff < (int)size) {
			event = NULL;
			goto broken_event;
		}

		/*
		 * Event straddles the mmap boundary -- header should always
		 * be inside due to u64 alignment of output.
		 */
		if ((start & md->mask) + size != ((start + size) & md->mask)) {
			unsigned int offset = start;
			unsigned int len = min(sizeof(*event), size), cpy;
			void *dst = md->event_copy;

			do {
				cpy = min(md->mask + 1 - (offset & md->mask), len);
				memcpy(dst, &data[offset & md->mask], cpy);
				offset += cpy;
				dst += cpy;
				len -= cpy;
			} while (len);

			event = (union perf_event *) md->event_copy;
		}

		start += size;
	}

broken_event:
	if (prev)
		*prev = start;

	return event;
}

union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int idx)
{
	struct perf_mmap *md = &evlist->mmap[idx];
	u64 head;
	u64 old = md->prev;

	/*
	 * Check if event was unmapped due to a POLLHUP/POLLERR.
	 */
	if (!atomic_read(&md->refcnt))
		return NULL;

	head = perf_mmap__read_head(md);

	return perf_mmap__read(md, evlist->overwrite, old, head, &md->prev);
}

union perf_event *
perf_evlist__mmap_read_backward(struct perf_evlist *evlist, int idx)
{
	struct perf_mmap *md = &evlist->mmap[idx];
	u64 head, end;
	u64 start = md->prev;

	/*
	 * Check if event was unmapped due to a POLLHUP/POLLERR.
	 */
	if (!atomic_read(&md->refcnt))
		return NULL;

	head = perf_mmap__read_head(md);
	if (!head)
		return NULL;

	/*
	 * 'head' pointer starts from 0. Kernel minus sizeof(record) form
	 * it each time when kernel writes to it, so in fact 'head' is
	 * negative. 'end' pointer is made manually by adding the size of
	 * the ring buffer to 'head' pointer, means the validate data can
	 * read is the whole ring buffer. If 'end' is positive, the ring
	 * buffer has not fully filled, so we must adjust 'end' to 0.
	 *
	 * However, since both 'head' and 'end' is unsigned, we can't
	 * simply compare 'end' against 0. Here we compare '-head' and
	 * the size of the ring buffer, where -head is the number of bytes
	 * kernel write to the ring buffer.
	 */
	if (-head < (u64)(md->mask + 1))
		end = 0;
	else
		end = head + md->mask + 1;

	return perf_mmap__read(md, false, start, end, &md->prev);
}

union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
{
	if (!evlist->backward)
		return perf_evlist__mmap_read_forward(evlist, idx);
	return perf_evlist__mmap_read_backward(evlist, idx);
}

void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx)
{
	struct perf_mmap *md = &evlist->mmap[idx];
	u64 head;

	if (!atomic_read(&md->refcnt))
		return;

	head = perf_mmap__read_head(md);
	md->prev = head;
}

static bool perf_mmap__empty(struct perf_mmap *md)
{
	return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base;
}

static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
{
	atomic_inc(&evlist->mmap[idx].refcnt);
}

static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
{
	struct perf_mmap *md = &evlist->mmap[idx];

	BUG_ON(md->base && atomic_read(&md->refcnt) == 0);

	if (atomic_dec_and_test(&md->refcnt))
		__perf_evlist__munmap(evlist, idx);
}

void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
{
	struct perf_mmap *md = &evlist->mmap[idx];

	if (!evlist->overwrite) {
		u64 old = md->prev;

		perf_mmap__write_tail(md, old);
	}

	if (atomic_read(&md->refcnt) == 1 && perf_mmap__empty(md))
		perf_evlist__mmap_put(evlist, idx);
}

int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,
			       struct auxtrace_mmap_params *mp __maybe_unused,
			       void *userpg __maybe_unused,
			       int fd __maybe_unused)
{
	return 0;
}

void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused)
{
}

void __weak auxtrace_mmap_params__init(
			struct auxtrace_mmap_params *mp __maybe_unused,
			off_t auxtrace_offset __maybe_unused,
			unsigned int auxtrace_pages __maybe_unused,
			bool auxtrace_overwrite __maybe_unused)
{
}

void __weak auxtrace_mmap_params__set_idx(
			struct auxtrace_mmap_params *mp __maybe_unused,
			struct perf_evlist *evlist __maybe_unused,
			int idx __maybe_unused,
			bool per_cpu __maybe_unused)
{
}

static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
{
	if (evlist->mmap[idx].base != NULL) {
		munmap(evlist->mmap[idx].base, evlist->mmap_len);
		evlist->mmap[idx].base = NULL;
		evlist->mmap[idx].fd = -1;
		atomic_set(&evlist->mmap[idx].refcnt, 0);
	}
	auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap);
}

void perf_evlist__munmap(struct perf_evlist *evlist)
{
	int i;

	if (evlist->mmap == NULL)
		return;

	for (i = 0; i < evlist->nr_mmaps; i++)
		__perf_evlist__munmap(evlist, i);

	zfree(&evlist->mmap);
}

static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
{
	int i;

	evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
	if (cpu_map__empty(evlist->cpus))
		evlist->nr_mmaps = thread_map__nr(evlist->threads);
	evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
	if (!evlist->mmap)
		return -ENOMEM;

	for (i = 0; i < evlist->nr_mmaps; i++)
		evlist->mmap[i].fd = -1;
	return 0;
}

struct mmap_params {
	int prot;
	int mask;
	struct auxtrace_mmap_params auxtrace_mp;
};

static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
			       struct mmap_params *mp, int fd)
{
	/*
	 * The last one will be done at perf_evlist__mmap_consume(), so that we
	 * make sure we don't prevent tools from consuming every last event in
	 * the ring buffer.
	 *
	 * I.e. we can get the POLLHUP meaning that the fd doesn't exist
	 * anymore, but the last events for it are still in the ring buffer,
	 * waiting to be consumed.
	 *
	 * Tools can chose to ignore this at their own discretion, but the
	 * evlist layer can't just drop it when filtering events in
	 * perf_evlist__filter_pollfd().
	 */
	atomic_set(&evlist->mmap[idx].refcnt, 2);
	evlist->mmap[idx].prev = 0;
	evlist->mmap[idx].mask = mp->mask;
	evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, mp->prot,
				      MAP_SHARED, fd, 0);
	if (evlist->mmap[idx].base == MAP_FAILED) {
		pr_debug2("failed to mmap perf event ring buffer, error %d\n",
			  errno);
		evlist->mmap[idx].base = NULL;
		return -1;
	}
	evlist->mmap[idx].fd = fd;

	if (auxtrace_mmap__mmap(&evlist->mmap[idx].auxtrace_mmap,
				&mp->auxtrace_mp, evlist->mmap[idx].base, fd))
		return -1;

	return 0;
}

static bool
perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
			 struct perf_evsel *evsel)
{
	if (evsel->overwrite)
		return false;
	return true;
}

static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
				       struct mmap_params *mp, int cpu,
				       int thread, int *output)
{
	struct perf_evsel *evsel;
	int revent;

	evlist__for_each_entry(evlist, evsel) {
		int fd;

		if (evsel->overwrite != (evlist->overwrite && evlist->backward))
			continue;

		if (evsel->system_wide && thread)
			continue;

		fd = FD(evsel, cpu, thread);

		if (*output == -1) {
			*output = fd;
			if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0)
				return -1;
		} else {
			if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
				return -1;

			perf_evlist__mmap_get(evlist, idx);
		}

		revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;

		/*
		 * The system_wide flag causes a selected event to be opened
		 * always without a pid.  Consequently it will never get a
		 * POLLHUP, but it is used for tracking in combination with
		 * other events, so it should not need to be polled anyway.
		 * Therefore don't add it for polling.
		 */
		if (!evsel->system_wide &&
		    __perf_evlist__add_pollfd(evlist, fd, idx, revent) < 0) {
			perf_evlist__mmap_put(evlist, idx);
			return -1;
		}

		if (evsel->attr.read_format & PERF_FORMAT_ID) {
			if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
						   fd) < 0)
				return -1;
			perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
						 thread);
		}
	}

	return 0;
}

static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
				     struct mmap_params *mp)
{
	int cpu, thread;
	int nr_cpus = cpu_map__nr(evlist->cpus);
	int nr_threads = thread_map__nr(evlist->threads);

	pr_debug2("perf event ring buffer mmapped per cpu\n");
	for (cpu = 0; cpu < nr_cpus; cpu++) {
		int output = -1;

		auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
					      true);

		for (thread = 0; thread < nr_threads; thread++) {
			if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
							thread, &output))
				goto out_unmap;
		}
	}

	return 0;

out_unmap:
	for (cpu = 0; cpu < nr_cpus; cpu++)
		__perf_evlist__munmap(evlist, cpu);
	return -1;
}

static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
					struct mmap_params *mp)
{
	int thread;
	int nr_threads = thread_map__nr(evlist->threads);

	pr_debug2("perf event ring buffer mmapped per thread\n");
	for (thread = 0; thread < nr_threads; thread++) {
		int output = -1;

		auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
					      false);

		if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
						&output))
			goto out_unmap;
	}

	return 0;

out_unmap:
	for (thread = 0; thread < nr_threads; thread++)
		__perf_evlist__munmap(evlist, thread);
	return -1;
}

unsigned long perf_event_mlock_kb_in_pages(void)
{
	unsigned long pages;
	int max;

	if (sysctl__read_int("kernel/perf_event_mlock_kb", &max) < 0) {
		/*
		 * Pick a once upon a time good value, i.e. things look
		 * strange since we can't read a sysctl value, but lets not
		 * die yet...
		 */
		max = 512;
	} else {
		max -= (page_size / 1024);
	}

	pages = (max * 1024) / page_size;
	if (!is_power_of_2(pages))
		pages = rounddown_pow_of_two(pages);

	return pages;
}

static size_t perf_evlist__mmap_size(unsigned long pages)
{
	if (pages == UINT_MAX)
		pages = perf_event_mlock_kb_in_pages();
	else if (!is_power_of_2(pages))
		return 0;

	return (pages + 1) * page_size;
}

static long parse_pages_arg(const char *str, unsigned long min,
			    unsigned long max)
{
	unsigned long pages, val;
	static struct parse_tag tags[] = {
		{ .tag  = 'B', .mult = 1       },
		{ .tag  = 'K', .mult = 1 << 10 },
		{ .tag  = 'M', .mult = 1 << 20 },
		{ .tag  = 'G', .mult = 1 << 30 },
		{ .tag  = 0 },
	};

	if (str == NULL)
		return -EINVAL;

	val = parse_tag_value(str, tags);
	if (val != (unsigned long) -1) {
		/* we got file size value */
		pages = PERF_ALIGN(val, page_size) / page_size;
	} else {
		/* we got pages count value */
		char *eptr;
		pages = strtoul(str, &eptr, 10);
		if (*eptr != '\0')
			return -EINVAL;
	}

	if (pages == 0 && min == 0) {
		/* leave number of pages at 0 */
	} else if (!is_power_of_2(pages)) {
		/* round pages up to next power of 2 */
		pages = roundup_pow_of_two(pages);
		if (!pages)
			return -EINVAL;
		pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n",
			pages * page_size, pages);
	}

	if (pages > max)
		return -EINVAL;

	return pages;
}

int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str)
{
	unsigned long max = UINT_MAX;
	long pages;

	if (max > SIZE_MAX / page_size)
		max = SIZE_MAX / page_size;

	pages = parse_pages_arg(str, 1, max);
	if (pages < 0) {
		pr_err("Invalid argument for --mmap_pages/-m\n");
		return -1;
	}

	*mmap_pages = pages;
	return 0;
}

int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
				  int unset __maybe_unused)
{
	return __perf_evlist__parse_mmap_pages(opt->value, str);
}

/**
 * perf_evlist__mmap_ex - Create mmaps to receive events.
 * @evlist: list of events
 * @pages: map length in pages
 * @overwrite: overwrite older events?
 * @auxtrace_pages - auxtrace map length in pages
 * @auxtrace_overwrite - overwrite older auxtrace data?
 *
 * If @overwrite is %false the user needs to signal event consumption using
 * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
 * automatically.
 *
 * Similarly, if @auxtrace_overwrite is %false the user needs to signal data
 * consumption using auxtrace_mmap__write_tail().
 *
 * Return: %0 on success, negative error code otherwise.
 */
int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
			 bool overwrite, unsigned int auxtrace_pages,
			 bool auxtrace_overwrite)
{
	struct perf_evsel *evsel;
	const struct cpu_map *cpus = evlist->cpus;
	const struct thread_map *threads = evlist->threads;
	struct mmap_params mp = {
		.prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
	};

	if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
		return -ENOMEM;

	if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
		return -ENOMEM;

	evlist->overwrite = overwrite;
	evlist->mmap_len = perf_evlist__mmap_size(pages);
	pr_debug("mmap size %zuB\n", evlist->mmap_len);
	mp.mask = evlist->mmap_len - page_size - 1;

	auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
				   auxtrace_pages, auxtrace_overwrite);

	evlist__for_each_entry(evlist, evsel) {
		if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
		    evsel->sample_id == NULL &&
		    perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
			return -ENOMEM;
	}

	if (cpu_map__empty(cpus))
		return perf_evlist__mmap_per_thread(evlist, &mp);

	return perf_evlist__mmap_per_cpu(evlist, &mp);
}

int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
		      bool overwrite)
{
	return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false);
}

int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
{
	struct cpu_map *cpus;
	struct thread_map *threads;

	threads = thread_map__new_str(target->pid, target->tid, target->uid);

	if (!threads)
		return -1;

	if (target__uses_dummy_map(target))
		cpus = cpu_map__dummy_new();
	else
		cpus = cpu_map__new(target->cpu_list);

	if (!cpus)
		goto out_delete_threads;

	evlist->has_user_cpus = !!target->cpu_list;

	perf_evlist__set_maps(evlist, cpus, threads);

	return 0;

out_delete_threads:
	thread_map__put(threads);
	return -1;
}

void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
			   struct thread_map *threads)
{
	/*
	 * Allow for the possibility that one or another of the maps isn't being
	 * changed i.e. don't put it.  Note we are assuming the maps that are
	 * being applied are brand new and evlist is taking ownership of the
	 * original reference count of 1.  If that is not the case it is up to
	 * the caller to increase the reference count.
	 */
	if (cpus != evlist->cpus) {
		cpu_map__put(evlist->cpus);
		evlist->cpus = cpu_map__get(cpus);
	}

	if (threads != evlist->threads) {
		thread_map__put(evlist->threads);
		evlist->threads = thread_map__get(threads);
	}

	perf_evlist__propagate_maps(evlist);
}

void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
				   enum perf_event_sample_format bit)
{
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel)
		__perf_evsel__set_sample_bit(evsel, bit);
}

void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
				     enum perf_event_sample_format bit)
{
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel)
		__perf_evsel__reset_sample_bit(evsel, bit);
}

int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
{
	struct perf_evsel *evsel;
	int err = 0;
	const int ncpus = cpu_map__nr(evlist->cpus),
		  nthreads = thread_map__nr(evlist->threads);

	evlist__for_each_entry(evlist, evsel) {
		if (evsel->filter == NULL)
			continue;

		/*
		 * filters only work for tracepoint event, which doesn't have cpu limit.
		 * So evlist and evsel should always be same.
		 */
		err = perf_evsel__apply_filter(evsel, ncpus, nthreads, evsel->filter);
		if (err) {
			*err_evsel = evsel;
			break;
		}
	}

	return err;
}

int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
{
	struct perf_evsel *evsel;
	int err = 0;

	evlist__for_each_entry(evlist, evsel) {
		if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
			continue;

		err = perf_evsel__set_filter(evsel, filter);
		if (err)
			break;
	}

	return err;
}

int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids)
{
	char *filter;
	int ret = -1;
	size_t i;

	for (i = 0; i < npids; ++i) {
		if (i == 0) {
			if (asprintf(&filter, "common_pid != %d", pids[i]) < 0)
				return -1;
		} else {
			char *tmp;

			if (asprintf(&tmp, "%s && common_pid != %d", filter, pids[i]) < 0)
				goto out_free;

			free(filter);
			filter = tmp;
		}
	}

	ret = perf_evlist__set_filter(evlist, filter);
out_free:
	free(filter);
	return ret;
}

int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid)
{
	return perf_evlist__set_filter_pids(evlist, 1, &pid);
}

bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
{
	struct perf_evsel *pos;

	if (evlist->nr_entries == 1)
		return true;

	if (evlist->id_pos < 0 || evlist->is_pos < 0)
		return false;

	evlist__for_each_entry(evlist, pos) {
		if (pos->id_pos != evlist->id_pos ||
		    pos->is_pos != evlist->is_pos)
			return false;
	}

	return true;
}

u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;

	if (evlist->combined_sample_type)
		return evlist->combined_sample_type;

	evlist__for_each_entry(evlist, evsel)
		evlist->combined_sample_type |= evsel->attr.sample_type;

	return evlist->combined_sample_type;
}

u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist)
{
	evlist->combined_sample_type = 0;
	return __perf_evlist__combined_sample_type(evlist);
}

u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;
	u64 branch_type = 0;

	evlist__for_each_entry(evlist, evsel)
		branch_type |= evsel->attr.branch_sample_type;
	return branch_type;
}

bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
	u64 read_format = first->attr.read_format;
	u64 sample_type = first->attr.sample_type;

	evlist__for_each_entry(evlist, pos) {
		if (read_format != pos->attr.read_format)
			return false;
	}

	/* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
	if ((sample_type & PERF_SAMPLE_READ) &&
	    !(read_format & PERF_FORMAT_ID)) {
		return false;
	}

	return true;
}

u64 perf_evlist__read_format(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist);
	return first->attr.read_format;
}

u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist);
	struct perf_sample *data;
	u64 sample_type;
	u16 size = 0;

	if (!first->attr.sample_id_all)
		goto out;

	sample_type = first->attr.sample_type;

	if (sample_type & PERF_SAMPLE_TID)
		size += sizeof(data->tid) * 2;

       if (sample_type & PERF_SAMPLE_TIME)
		size += sizeof(data->time);

	if (sample_type & PERF_SAMPLE_ID)
		size += sizeof(data->id);

	if (sample_type & PERF_SAMPLE_STREAM_ID)
		size += sizeof(data->stream_id);

	if (sample_type & PERF_SAMPLE_CPU)
		size += sizeof(data->cpu) * 2;

	if (sample_type & PERF_SAMPLE_IDENTIFIER)
		size += sizeof(data->id);
out:
	return size;
}

bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;

	evlist__for_each_entry_continue(evlist, pos) {
		if (first->attr.sample_id_all != pos->attr.sample_id_all)
			return false;
	}

	return true;
}

bool perf_evlist__sample_id_all(struct perf_evlist *evlist)
{
	struct perf_evsel *first = perf_evlist__first(evlist);
	return first->attr.sample_id_all;
}

void perf_evlist__set_selected(struct perf_evlist *evlist,
			       struct perf_evsel *evsel)
{
	evlist->selected = evsel;
}

void perf_evlist__close(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;
	int ncpus = cpu_map__nr(evlist->cpus);
	int nthreads = thread_map__nr(evlist->threads);
	int n;

	evlist__for_each_entry_reverse(evlist, evsel) {
		n = evsel->cpus ? evsel->cpus->nr : ncpus;
		perf_evsel__close(evsel, n, nthreads);
	}
}

static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
{
	struct cpu_map	  *cpus;
	struct thread_map *threads;
	int err = -ENOMEM;

	/*
	 * Try reading /sys/devices/system/cpu/online to get
	 * an all cpus map.
	 *
	 * FIXME: -ENOMEM is the best we can do here, the cpu_map
	 * code needs an overhaul to properly forward the
	 * error, and we may not want to do that fallback to a
	 * default cpu identity map :-\
	 */
	cpus = cpu_map__new(NULL);
	if (!cpus)
		goto out;

	threads = thread_map__new_dummy();
	if (!threads)
		goto out_put;

	perf_evlist__set_maps(evlist, cpus, threads);
out:
	return err;
out_put:
	cpu_map__put(cpus);
	goto out;
}

int perf_evlist__open(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;
	int err;

	/*
	 * Default: one fd per CPU, all threads, aka systemwide
	 * as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
	 */
	if (evlist->threads == NULL && evlist->cpus == NULL) {
		err = perf_evlist__create_syswide_maps(evlist);
		if (err < 0)
			goto out_err;
	}

	perf_evlist__update_id_pos(evlist);

	evlist__for_each_entry(evlist, evsel) {
		err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
		if (err < 0)
			goto out_err;
	}

	return 0;
out_err:
	perf_evlist__close(evlist);
	errno = -err;
	return err;
}

int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
				  const char *argv[], bool pipe_output,
				  void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
{
	int child_ready_pipe[2], go_pipe[2];
	char bf;

	if (pipe(child_ready_pipe) < 0) {
		perror("failed to create 'ready' pipe");
		return -1;
	}

	if (pipe(go_pipe) < 0) {
		perror("failed to create 'go' pipe");
		goto out_close_ready_pipe;
	}

	evlist->workload.pid = fork();
	if (evlist->workload.pid < 0) {
		perror("failed to fork");
		goto out_close_pipes;
	}

	if (!evlist->workload.pid) {
		int ret;

		if (pipe_output)
			dup2(2, 1);

		signal(SIGTERM, SIG_DFL);

		close(child_ready_pipe[0]);
		close(go_pipe[1]);
		fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);

		/*
		 * Tell the parent we're ready to go
		 */
		close(child_ready_pipe[1]);

		/*
		 * Wait until the parent tells us to go.
		 */
		ret = read(go_pipe[0], &bf, 1);
		/*
		 * The parent will ask for the execvp() to be performed by
		 * writing exactly one byte, in workload.cork_fd, usually via
		 * perf_evlist__start_workload().
		 *
		 * For cancelling the workload without actually running it,
		 * the parent will just close workload.cork_fd, without writing
		 * anything, i.e. read will return zero and we just exit()
		 * here.
		 */
		if (ret != 1) {
			if (ret == -1)
				perror("unable to read pipe");
			exit(ret);
		}

		execvp(argv[0], (char **)argv);

		if (exec_error) {
			union sigval val;

			val.sival_int = errno;
			if (sigqueue(getppid(), SIGUSR1, val))
				perror(argv[0]);
		} else
			perror(argv[0]);
		exit(-1);
	}

	if (exec_error) {
		struct sigaction act = {
			.sa_flags     = SA_SIGINFO,
			.sa_sigaction = exec_error,
		};
		sigaction(SIGUSR1, &act, NULL);
	}

	if (target__none(target)) {
		if (evlist->threads == NULL) {
			fprintf(stderr, "FATAL: evlist->threads need to be set at this point (%s:%d).\n",
				__func__, __LINE__);
			goto out_close_pipes;
		}
		thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
	}

	close(child_ready_pipe[1]);
	close(go_pipe[0]);
	/*
	 * wait for child to settle
	 */
	if (read(child_ready_pipe[0], &bf, 1) == -1) {
		perror("unable to read pipe");
		goto out_close_pipes;
	}

	fcntl(go_pipe[1], F_SETFD, FD_CLOEXEC);
	evlist->workload.cork_fd = go_pipe[1];
	close(child_ready_pipe[0]);
	return 0;

out_close_pipes:
	close(go_pipe[0]);
	close(go_pipe[1]);
out_close_ready_pipe:
	close(child_ready_pipe[0]);
	close(child_ready_pipe[1]);
	return -1;
}

int perf_evlist__start_workload(struct perf_evlist *evlist)
{
	if (evlist->workload.cork_fd > 0) {
		char bf = 0;
		int ret;
		/*
		 * Remove the cork, let it rip!
		 */
		ret = write(evlist->workload.cork_fd, &bf, 1);
		if (ret < 0)
			perror("enable to write to pipe");

		close(evlist->workload.cork_fd);
		return ret;
	}

	return 0;
}

int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
			      struct perf_sample *sample)
{
	struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);

	if (!evsel)
		return -EFAULT;
	return perf_evsel__parse_sample(evsel, event, sample);
}

size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
{
	struct perf_evsel *evsel;
	size_t printed = 0;

	evlist__for_each_entry(evlist, evsel) {
		printed += fprintf(fp, "%s%s", evsel->idx ? ", " : "",
				   perf_evsel__name(evsel));
	}

	return printed + fprintf(fp, "\n");
}

int perf_evlist__strerror_open(struct perf_evlist *evlist,
			       int err, char *buf, size_t size)
{
	int printed, value;
	char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));

	switch (err) {
	case EACCES:
	case EPERM:
		printed = scnprintf(buf, size,
				    "Error:\t%s.\n"
				    "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);

		value = perf_event_paranoid();

		printed += scnprintf(buf + printed, size - printed, "\nHint:\t");

		if (value >= 2) {
			printed += scnprintf(buf + printed, size - printed,
					     "For your workloads it needs to be <= 1\nHint:\t");
		}
		printed += scnprintf(buf + printed, size - printed,
				     "For system wide tracing it needs to be set to -1.\n");

		printed += scnprintf(buf + printed, size - printed,
				    "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"
				    "Hint:\tThe current value is %d.", value);
		break;
	case EINVAL: {
		struct perf_evsel *first = perf_evlist__first(evlist);
		int max_freq;

		if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0)
			goto out_default;

		if (first->attr.sample_freq < (u64)max_freq)
			goto out_default;

		printed = scnprintf(buf, size,
				    "Error:\t%s.\n"
				    "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
				    "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
				    emsg, max_freq, first->attr.sample_freq);
		break;
	}
	default:
out_default:
		scnprintf(buf, size, "%s", emsg);
		break;
	}

	return 0;
}

int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
{
	char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
	int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;

	switch (err) {
	case EPERM:
		sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
		printed += scnprintf(buf + printed, size - printed,
				     "Error:\t%s.\n"
				     "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
				     "Hint:\tTried using %zd kB.\n",
				     emsg, pages_max_per_user, pages_attempted);

		if (pages_attempted >= pages_max_per_user) {
			printed += scnprintf(buf + printed, size - printed,
					     "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
					     pages_max_per_user + pages_attempted);
		}

		printed += scnprintf(buf + printed, size - printed,
				     "Hint:\tTry using a smaller -m/--mmap-pages value.");
		break;
	default:
		scnprintf(buf, size, "%s", emsg);
		break;
	}

	return 0;
}

void perf_evlist__to_front(struct perf_evlist *evlist,
			   struct perf_evsel *move_evsel)
{
	struct perf_evsel *evsel, *n;
	LIST_HEAD(move);

	if (move_evsel == perf_evlist__first(evlist))
		return;

	evlist__for_each_entry_safe(evlist, n, evsel) {
		if (evsel->leader == move_evsel->leader)
			list_move_tail(&evsel->node, &move);
	}

	list_splice(&move, &evlist->entries);
}

void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
				     struct perf_evsel *tracking_evsel)
{
	struct perf_evsel *evsel;

	if (tracking_evsel->tracking)
		return;

	evlist__for_each_entry(evlist, evsel) {
		if (evsel != tracking_evsel)
			evsel->tracking = false;
	}

	tracking_evsel->tracking = true;
}

struct perf_evsel *
perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
			       const char *str)
{
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel) {
		if (!evsel->name)
			continue;
		if (strcmp(str, evsel->name) == 0)
			return evsel;
	}

	return NULL;
}