summaryrefslogtreecommitdiff
path: root/drivers/acpi/arm64/iort.c
blob: 95255ecfae7c7c0725ee8ebbde612d93a71966a9 (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
/*
 * Copyright (C) 2016, Semihalf
 *	Author: Tomasz Nowicki <tn@semihalf.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * This file implements early detection/parsing of I/O mapping
 * reported to OS through firmware via I/O Remapping Table (IORT)
 * IORT document number: ARM DEN 0049A
 */

#define pr_fmt(fmt)	"ACPI: IORT: " fmt

#include <linux/acpi_iort.h>
#include <linux/iommu.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define IORT_TYPE_MASK(type)	(1 << (type))
#define IORT_MSI_TYPE		(1 << ACPI_IORT_NODE_ITS_GROUP)
#define IORT_IOMMU_TYPE		((1 << ACPI_IORT_NODE_SMMU) |	\
				(1 << ACPI_IORT_NODE_SMMU_V3))

/* Until ACPICA headers cover IORT rev. C */
#ifndef ACPI_IORT_SMMU_V3_CAVIUM_CN99XX
#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX		0x2
#endif

struct iort_its_msi_chip {
	struct list_head	list;
	struct fwnode_handle	*fw_node;
	u32			translation_id;
};

struct iort_fwnode {
	struct list_head list;
	struct acpi_iort_node *iort_node;
	struct fwnode_handle *fwnode;
};
static LIST_HEAD(iort_fwnode_list);
static DEFINE_SPINLOCK(iort_fwnode_lock);

/**
 * iort_set_fwnode() - Create iort_fwnode and use it to register
 *		       iommu data in the iort_fwnode_list
 *
 * @node: IORT table node associated with the IOMMU
 * @fwnode: fwnode associated with the IORT node
 *
 * Returns: 0 on success
 *          <0 on failure
 */
static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
				  struct fwnode_handle *fwnode)
{
	struct iort_fwnode *np;

	np = kzalloc(sizeof(struct iort_fwnode), GFP_ATOMIC);

	if (WARN_ON(!np))
		return -ENOMEM;

	INIT_LIST_HEAD(&np->list);
	np->iort_node = iort_node;
	np->fwnode = fwnode;

	spin_lock(&iort_fwnode_lock);
	list_add_tail(&np->list, &iort_fwnode_list);
	spin_unlock(&iort_fwnode_lock);

	return 0;
}

/**
 * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
 *
 * @node: IORT table node to be looked-up
 *
 * Returns: fwnode_handle pointer on success, NULL on failure
 */
static inline struct fwnode_handle *iort_get_fwnode(
			struct acpi_iort_node *node)
{
	struct iort_fwnode *curr;
	struct fwnode_handle *fwnode = NULL;

	spin_lock(&iort_fwnode_lock);
	list_for_each_entry(curr, &iort_fwnode_list, list) {
		if (curr->iort_node == node) {
			fwnode = curr->fwnode;
			break;
		}
	}
	spin_unlock(&iort_fwnode_lock);

	return fwnode;
}

/**
 * iort_delete_fwnode() - Delete fwnode associated with an IORT node
 *
 * @node: IORT table node associated with fwnode to delete
 */
static inline void iort_delete_fwnode(struct acpi_iort_node *node)
{
	struct iort_fwnode *curr, *tmp;

	spin_lock(&iort_fwnode_lock);
	list_for_each_entry_safe(curr, tmp, &iort_fwnode_list, list) {
		if (curr->iort_node == node) {
			list_del(&curr->list);
			kfree(curr);
			break;
		}
	}
	spin_unlock(&iort_fwnode_lock);
}

/**
 * iort_get_iort_node() - Retrieve iort_node associated with an fwnode
 *
 * @fwnode: fwnode associated with device to be looked-up
 *
 * Returns: iort_node pointer on success, NULL on failure
 */
static inline struct acpi_iort_node *iort_get_iort_node(
			struct fwnode_handle *fwnode)
{
	struct iort_fwnode *curr;
	struct acpi_iort_node *iort_node = NULL;

	spin_lock(&iort_fwnode_lock);
	list_for_each_entry(curr, &iort_fwnode_list, list) {
		if (curr->fwnode == fwnode) {
			iort_node = curr->iort_node;
			break;
		}
	}
	spin_unlock(&iort_fwnode_lock);

	return iort_node;
}

typedef acpi_status (*iort_find_node_callback)
	(struct acpi_iort_node *node, void *context);

/* Root pointer to the mapped IORT table */
static struct acpi_table_header *iort_table;

static LIST_HEAD(iort_msi_chip_list);
static DEFINE_SPINLOCK(iort_msi_chip_lock);

/**
 * iort_register_domain_token() - register domain token and related ITS ID
 * to the list from where we can get it back later on.
 * @trans_id: ITS ID.
 * @fw_node: Domain token.
 *
 * Returns: 0 on success, -ENOMEM if no memory when allocating list element
 */
int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node)
{
	struct iort_its_msi_chip *its_msi_chip;

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

	its_msi_chip->fw_node = fw_node;
	its_msi_chip->translation_id = trans_id;

	spin_lock(&iort_msi_chip_lock);
	list_add(&its_msi_chip->list, &iort_msi_chip_list);
	spin_unlock(&iort_msi_chip_lock);

	return 0;
}

/**
 * iort_deregister_domain_token() - Deregister domain token based on ITS ID
 * @trans_id: ITS ID.
 *
 * Returns: none.
 */
void iort_deregister_domain_token(int trans_id)
{
	struct iort_its_msi_chip *its_msi_chip, *t;

	spin_lock(&iort_msi_chip_lock);
	list_for_each_entry_safe(its_msi_chip, t, &iort_msi_chip_list, list) {
		if (its_msi_chip->translation_id == trans_id) {
			list_del(&its_msi_chip->list);
			kfree(its_msi_chip);
			break;
		}
	}
	spin_unlock(&iort_msi_chip_lock);
}

/**
 * iort_find_domain_token() - Find domain token based on given ITS ID
 * @trans_id: ITS ID.
 *
 * Returns: domain token when find on the list, NULL otherwise
 */
struct fwnode_handle *iort_find_domain_token(int trans_id)
{
	struct fwnode_handle *fw_node = NULL;
	struct iort_its_msi_chip *its_msi_chip;

	spin_lock(&iort_msi_chip_lock);
	list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) {
		if (its_msi_chip->translation_id == trans_id) {
			fw_node = its_msi_chip->fw_node;
			break;
		}
	}
	spin_unlock(&iort_msi_chip_lock);

	return fw_node;
}

static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
					     iort_find_node_callback callback,
					     void *context)
{
	struct acpi_iort_node *iort_node, *iort_end;
	struct acpi_table_iort *iort;
	int i;

	if (!iort_table)
		return NULL;

	/* Get the first IORT node */
	iort = (struct acpi_table_iort *)iort_table;
	iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
				 iort->node_offset);
	iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
				iort_table->length);

	for (i = 0; i < iort->node_count; i++) {
		if (WARN_TAINT(iort_node >= iort_end, TAINT_FIRMWARE_WORKAROUND,
			       "IORT node pointer overflows, bad table!\n"))
			return NULL;

		if (iort_node->type == type &&
		    ACPI_SUCCESS(callback(iort_node, context)))
			return iort_node;

		iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
					 iort_node->length);
	}

	return NULL;
}

static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
					    void *context)
{
	struct device *dev = context;
	acpi_status status = AE_NOT_FOUND;

	if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) {
		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
		struct acpi_device *adev = to_acpi_device_node(dev->fwnode);
		struct acpi_iort_named_component *ncomp;

		if (!adev)
			goto out;

		status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf);
		if (ACPI_FAILURE(status)) {
			dev_warn(dev, "Can't get device full path name\n");
			goto out;
		}

		ncomp = (struct acpi_iort_named_component *)node->node_data;
		status = !strcmp(ncomp->device_name, buf.pointer) ?
							AE_OK : AE_NOT_FOUND;
		acpi_os_free(buf.pointer);
	} else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
		struct acpi_iort_root_complex *pci_rc;
		struct pci_bus *bus;

		bus = to_pci_bus(dev);
		pci_rc = (struct acpi_iort_root_complex *)node->node_data;

		/*
		 * It is assumed that PCI segment numbers maps one-to-one
		 * with root complexes. Each segment number can represent only
		 * one root complex.
		 */
		status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
							AE_OK : AE_NOT_FOUND;
	}
out:
	return status;
}

static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
		       u32 *rid_out)
{
	/* Single mapping does not care for input id */
	if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
		if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
		    type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
			*rid_out = map->output_base;
			return 0;
		}

		pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
			map, type);
		return -ENXIO;
	}

	if (rid_in < map->input_base ||
	    (rid_in >= map->input_base + map->id_count))
		return -ENXIO;

	*rid_out = map->output_base + (rid_in - map->input_base);
	return 0;
}

static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
					       u32 *id_out, int index)
{
	struct acpi_iort_node *parent;
	struct acpi_iort_id_mapping *map;

	if (!node->mapping_offset || !node->mapping_count ||
				     index >= node->mapping_count)
		return NULL;

	map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
			   node->mapping_offset + index * sizeof(*map));

	/* Firmware bug! */
	if (!map->output_reference) {
		pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
		       node, node->type);
		return NULL;
	}

	parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
			       map->output_reference);

	if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
		if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
		    node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
		    node->type == ACPI_IORT_NODE_SMMU_V3) {
			*id_out = map->output_base;
			return parent;
		}
	}

	return NULL;
}

#if (ACPI_CA_VERSION > 0x20170929)
static int iort_get_id_mapping_index(struct acpi_iort_node *node)
{
	struct acpi_iort_smmu_v3 *smmu;

	switch (node->type) {
	case ACPI_IORT_NODE_SMMU_V3:
		/*
		 * SMMUv3 dev ID mapping index was introduced in revision 1
		 * table, not available in revision 0
		 */
		if (node->revision < 1)
			return -EINVAL;

		smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
		/*
		 * ID mapping index is only ignored if all interrupts are
		 * GSIV based
		 */
		if (smmu->event_gsiv && smmu->pri_gsiv && smmu->gerr_gsiv
		    && smmu->sync_gsiv)
			return -EINVAL;

		if (smmu->id_mapping_index >= node->mapping_count) {
			pr_err(FW_BUG "[node %p type %d] ID mapping index overflows valid mappings\n",
			       node, node->type);
			return -EINVAL;
		}

		return smmu->id_mapping_index;
	default:
		return -EINVAL;
	}
}
#else
static inline int iort_get_id_mapping_index(struct acpi_iort_node *node)
{
	return -EINVAL;
}
#endif

static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
					       u32 id_in, u32 *id_out,
					       u8 type_mask)
{
	u32 id = id_in;

	/* Parse the ID mapping tree to find specified node type */
	while (node) {
		struct acpi_iort_id_mapping *map;
		int i, index;

		if (IORT_TYPE_MASK(node->type) & type_mask) {
			if (id_out)
				*id_out = id;
			return node;
		}

		if (!node->mapping_offset || !node->mapping_count)
			goto fail_map;

		map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
				   node->mapping_offset);

		/* Firmware bug! */
		if (!map->output_reference) {
			pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
			       node, node->type);
			goto fail_map;
		}

		/*
		 * Get the special ID mapping index (if any) and skip its
		 * associated ID map to prevent erroneous multi-stage
		 * IORT ID translations.
		 */
		index = iort_get_id_mapping_index(node);

		/* Do the ID translation */
		for (i = 0; i < node->mapping_count; i++, map++) {
			/* if it is special mapping index, skip it */
			if (i == index)
				continue;

			if (!iort_id_map(map, node->type, id, &id))
				break;
		}

		if (i == node->mapping_count)
			goto fail_map;

		node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
				    map->output_reference);
	}

fail_map:
	/* Map input ID to output ID unchanged on mapping failure */
	if (id_out)
		*id_out = id_in;

	return NULL;
}

static struct acpi_iort_node *iort_node_map_platform_id(
		struct acpi_iort_node *node, u32 *id_out, u8 type_mask,
		int index)
{
	struct acpi_iort_node *parent;
	u32 id;

	/* step 1: retrieve the initial dev id */
	parent = iort_node_get_id(node, &id, index);
	if (!parent)
		return NULL;

	/*
	 * optional step 2: map the initial dev id if its parent is not
	 * the target type we want, map it again for the use cases such
	 * as NC (named component) -> SMMU -> ITS. If the type is matched,
	 * return the initial dev id and its parent pointer directly.
	 */
	if (!(IORT_TYPE_MASK(parent->type) & type_mask))
		parent = iort_node_map_id(parent, id, id_out, type_mask);
	else
		if (id_out)
			*id_out = id;

	return parent;
}

static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
{
	struct pci_bus *pbus;

	if (!dev_is_pci(dev)) {
		struct acpi_iort_node *node;
		/*
		 * scan iort_fwnode_list to see if it's an iort platform
		 * device (such as SMMU, PMCG),its iort node already cached
		 * and associated with fwnode when iort platform devices
		 * were initialized.
		 */
		node = iort_get_iort_node(dev->fwnode);
		if (node)
			return node;

		/*
		 * if not, then it should be a platform device defined in
		 * DSDT/SSDT (with Named Component node in IORT)
		 */
		return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
				      iort_match_node_callback, dev);
	}

	/* Find a PCI root bus */
	pbus = to_pci_dev(dev)->bus;
	while (!pci_is_root_bus(pbus))
		pbus = pbus->parent;

	return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
			      iort_match_node_callback, &pbus->dev);
}

/**
 * iort_msi_map_rid() - Map a MSI requester ID for a device
 * @dev: The device for which the mapping is to be done.
 * @req_id: The device requester ID.
 *
 * Returns: mapped MSI RID on success, input requester ID otherwise
 */
u32 iort_msi_map_rid(struct device *dev, u32 req_id)
{
	struct acpi_iort_node *node;
	u32 dev_id;

	node = iort_find_dev_node(dev);
	if (!node)
		return req_id;

	iort_node_map_id(node, req_id, &dev_id, IORT_MSI_TYPE);
	return dev_id;
}

/**
 * iort_pmsi_get_dev_id() - Get the device id for a device
 * @dev: The device for which the mapping is to be done.
 * @dev_id: The device ID found.
 *
 * Returns: 0 for successful find a dev id, -ENODEV on error
 */
int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
{
	int i, index;
	struct acpi_iort_node *node;

	node = iort_find_dev_node(dev);
	if (!node)
		return -ENODEV;

	index = iort_get_id_mapping_index(node);
	/* if there is a valid index, go get the dev_id directly */
	if (index >= 0) {
		if (iort_node_get_id(node, dev_id, index))
			return 0;
	} else {
		for (i = 0; i < node->mapping_count; i++) {
			if (iort_node_map_platform_id(node, dev_id,
						      IORT_MSI_TYPE, i))
				return 0;
		}
	}

	return -ENODEV;
}

/**
 * iort_dev_find_its_id() - Find the ITS identifier for a device
 * @dev: The device.
 * @req_id: Device's requester ID
 * @idx: Index of the ITS identifier list.
 * @its_id: ITS identifier.
 *
 * Returns: 0 on success, appropriate error value otherwise
 */
static int iort_dev_find_its_id(struct device *dev, u32 req_id,
				unsigned int idx, int *its_id)
{
	struct acpi_iort_its_group *its;
	struct acpi_iort_node *node;

	node = iort_find_dev_node(dev);
	if (!node)
		return -ENXIO;

	node = iort_node_map_id(node, req_id, NULL, IORT_MSI_TYPE);
	if (!node)
		return -ENXIO;

	/* Move to ITS specific data */
	its = (struct acpi_iort_its_group *)node->node_data;
	if (idx > its->its_count) {
		dev_err(dev, "requested ITS ID index [%d] is greater than available [%d]\n",
			idx, its->its_count);
		return -ENXIO;
	}

	*its_id = its->identifiers[idx];
	return 0;
}

/**
 * iort_get_device_domain() - Find MSI domain related to a device
 * @dev: The device.
 * @req_id: Requester ID for the device.
 *
 * Returns: the MSI domain for this device, NULL otherwise
 */
struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id)
{
	struct fwnode_handle *handle;
	int its_id;

	if (iort_dev_find_its_id(dev, req_id, 0, &its_id))
		return NULL;

	handle = iort_find_domain_token(its_id);
	if (!handle)
		return NULL;

	return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);
}

static void iort_set_device_domain(struct device *dev,
				   struct acpi_iort_node *node)
{
	struct acpi_iort_its_group *its;
	struct acpi_iort_node *msi_parent;
	struct acpi_iort_id_mapping *map;
	struct fwnode_handle *iort_fwnode;
	struct irq_domain *domain;
	int index;

	index = iort_get_id_mapping_index(node);
	if (index < 0)
		return;

	map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
			   node->mapping_offset + index * sizeof(*map));

	/* Firmware bug! */
	if (!map->output_reference ||
	    !(map->flags & ACPI_IORT_ID_SINGLE_MAPPING)) {
		pr_err(FW_BUG "[node %p type %d] Invalid MSI mapping\n",
		       node, node->type);
		return;
	}

	msi_parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
				  map->output_reference);

	if (!msi_parent || msi_parent->type != ACPI_IORT_NODE_ITS_GROUP)
		return;

	/* Move to ITS specific data */
	its = (struct acpi_iort_its_group *)msi_parent->node_data;

	iort_fwnode = iort_find_domain_token(its->identifiers[0]);
	if (!iort_fwnode)
		return;

	domain = irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);
	if (domain)
		dev_set_msi_domain(dev, domain);
}

/**
 * iort_get_platform_device_domain() - Find MSI domain related to a
 * platform device
 * @dev: the dev pointer associated with the platform device
 *
 * Returns: the MSI domain for this device, NULL otherwise
 */
static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
{
	struct acpi_iort_node *node, *msi_parent;
	struct fwnode_handle *iort_fwnode;
	struct acpi_iort_its_group *its;
	int i;

	/* find its associated iort node */
	node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
			      iort_match_node_callback, dev);
	if (!node)
		return NULL;

	/* then find its msi parent node */
	for (i = 0; i < node->mapping_count; i++) {
		msi_parent = iort_node_map_platform_id(node, NULL,
						       IORT_MSI_TYPE, i);
		if (msi_parent)
			break;
	}

	if (!msi_parent)
		return NULL;

	/* Move to ITS specific data */
	its = (struct acpi_iort_its_group *)msi_parent->node_data;

	iort_fwnode = iort_find_domain_token(its->identifiers[0]);
	if (!iort_fwnode)
		return NULL;

	return irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);
}

void acpi_configure_pmsi_domain(struct device *dev)
{
	struct irq_domain *msi_domain;

	msi_domain = iort_get_platform_device_domain(dev);
	if (msi_domain)
		dev_set_msi_domain(dev, msi_domain);
}

static int __maybe_unused __get_pci_rid(struct pci_dev *pdev, u16 alias,
					void *data)
{
	u32 *rid = data;

	*rid = alias;
	return 0;
}

static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
			       struct fwnode_handle *fwnode,
			       const struct iommu_ops *ops)
{
	int ret = iommu_fwspec_init(dev, fwnode, ops);

	if (!ret)
		ret = iommu_fwspec_add_ids(dev, &streamid, 1);

	return ret;
}

static inline bool iort_iommu_driver_enabled(u8 type)
{
	switch (type) {
	case ACPI_IORT_NODE_SMMU_V3:
		return IS_BUILTIN(CONFIG_ARM_SMMU_V3);
	case ACPI_IORT_NODE_SMMU:
		return IS_BUILTIN(CONFIG_ARM_SMMU);
	default:
		pr_warn("IORT node type %u does not describe an SMMU\n", type);
		return false;
	}
}

#ifdef CONFIG_IOMMU_API
static inline const struct iommu_ops *iort_fwspec_iommu_ops(
				struct iommu_fwspec *fwspec)
{
	return (fwspec && fwspec->ops) ? fwspec->ops : NULL;
}

static inline int iort_add_device_replay(const struct iommu_ops *ops,
					 struct device *dev)
{
	int err = 0;

	if (ops->add_device && dev->bus && !dev->iommu_group)
		err = ops->add_device(dev);

	return err;
}
#else
static inline const struct iommu_ops *iort_fwspec_iommu_ops(
				struct iommu_fwspec *fwspec)
{ return NULL; }
static inline int iort_add_device_replay(const struct iommu_ops *ops,
					 struct device *dev)
{ return 0; }
#endif

static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node,
			    u32 streamid)
{
	const struct iommu_ops *ops;
	struct fwnode_handle *iort_fwnode;

	if (!node)
		return -ENODEV;

	iort_fwnode = iort_get_fwnode(node);
	if (!iort_fwnode)
		return -ENODEV;

	/*
	 * If the ops look-up fails, this means that either
	 * the SMMU drivers have not been probed yet or that
	 * the SMMU drivers are not built in the kernel;
	 * Depending on whether the SMMU drivers are built-in
	 * in the kernel or not, defer the IOMMU configuration
	 * or just abort it.
	 */
	ops = iommu_ops_from_fwnode(iort_fwnode);
	if (!ops)
		return iort_iommu_driver_enabled(node->type) ?
		       -EPROBE_DEFER : -ENODEV;

	return arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
}

struct iort_pci_alias_info {
	struct device *dev;
	struct acpi_iort_node *node;
};

static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
{
	struct iort_pci_alias_info *info = data;
	struct acpi_iort_node *parent;
	u32 streamid;

	parent = iort_node_map_id(info->node, alias, &streamid,
				  IORT_IOMMU_TYPE);
	return iort_iommu_xlate(info->dev, parent, streamid);
}

static int nc_dma_get_range(struct device *dev, u64 *size)
{
	struct acpi_iort_node *node;
	struct acpi_iort_named_component *ncomp;

	node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
			      iort_match_node_callback, dev);
	if (!node)
		return -ENODEV;

	ncomp = (struct acpi_iort_named_component *)node->node_data;

	*size = ncomp->memory_address_limit >= 64 ? U64_MAX :
			1ULL<<ncomp->memory_address_limit;

	return 0;
}

/**
 * iort_dma_setup() - Set-up device DMA parameters.
 *
 * @dev: device to configure
 * @dma_addr: device DMA address result pointer
 * @size: DMA range size result pointer
 */
void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
{
	u64 mask, dmaaddr = 0, size = 0, offset = 0;
	int ret, msb;

	/*
	 * Set default coherent_dma_mask to 32 bit.  Drivers are expected to
	 * setup the correct supported mask.
	 */
	if (!dev->coherent_dma_mask)
		dev->coherent_dma_mask = DMA_BIT_MASK(32);

	/*
	 * Set it to coherent_dma_mask by default if the architecture
	 * code has not set it.
	 */
	if (!dev->dma_mask)
		dev->dma_mask = &dev->coherent_dma_mask;

	size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);

	if (dev_is_pci(dev))
		ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size);
	else
		ret = nc_dma_get_range(dev, &size);

	if (!ret) {
		msb = fls64(dmaaddr + size - 1);
		/*
		 * Round-up to the power-of-two mask or set
		 * the mask to the whole 64-bit address space
		 * in case the DMA region covers the full
		 * memory window.
		 */
		mask = msb == 64 ? U64_MAX : (1ULL << msb) - 1;
		/*
		 * Limit coherent and dma mask based on size
		 * retrieved from firmware.
		 */
		dev->coherent_dma_mask = mask;
		*dev->dma_mask = mask;
	}

	*dma_addr = dmaaddr;
	*dma_size = size;

	dev->dma_pfn_offset = PFN_DOWN(offset);
	dev_dbg(dev, "dma_pfn_offset(%#08llx)\n", offset);
}

/**
 * iort_iommu_configure - Set-up IOMMU configuration for a device.
 *
 * @dev: device to configure
 *
 * Returns: iommu_ops pointer on configuration success
 *          NULL on configuration failure
 */
const struct iommu_ops *iort_iommu_configure(struct device *dev)
{
	struct acpi_iort_node *node, *parent;
	const struct iommu_ops *ops;
	u32 streamid = 0;
	int err = -ENODEV;

	/*
	 * If we already translated the fwspec there
	 * is nothing left to do, return the iommu_ops.
	 */
	ops = iort_fwspec_iommu_ops(dev->iommu_fwspec);
	if (ops)
		return ops;

	if (dev_is_pci(dev)) {
		struct pci_bus *bus = to_pci_dev(dev)->bus;
		struct iort_pci_alias_info info = { .dev = dev };

		node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
				      iort_match_node_callback, &bus->dev);
		if (!node)
			return NULL;

		info.node = node;
		err = pci_for_each_dma_alias(to_pci_dev(dev),
					     iort_pci_iommu_init, &info);
	} else {
		int i = 0;

		node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
				      iort_match_node_callback, dev);
		if (!node)
			return NULL;

		do {
			parent = iort_node_map_platform_id(node, &streamid,
							   IORT_IOMMU_TYPE,
							   i++);

			if (parent)
				err = iort_iommu_xlate(dev, parent, streamid);
		} while (parent && !err);
	}

	/*
	 * If we have reason to believe the IOMMU driver missed the initial
	 * add_device callback for dev, replay it to get things in order.
	 */
	if (!err) {
		ops = iort_fwspec_iommu_ops(dev->iommu_fwspec);
		err = iort_add_device_replay(ops, dev);
	}

	/* Ignore all other errors apart from EPROBE_DEFER */
	if (err == -EPROBE_DEFER) {
		ops = ERR_PTR(err);
	} else if (err) {
		dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
		ops = NULL;
	}

	return ops;
}

static void __init acpi_iort_register_irq(int hwirq, const char *name,
					  int trigger,
					  struct resource *res)
{
	int irq = acpi_register_gsi(NULL, hwirq, trigger,
				    ACPI_ACTIVE_HIGH);

	if (irq <= 0) {
		pr_err("could not register gsi hwirq %d name [%s]\n", hwirq,
								      name);
		return;
	}

	res->start = irq;
	res->end = irq;
	res->flags = IORESOURCE_IRQ;
	res->name = name;
}

static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node)
{
	struct acpi_iort_smmu_v3 *smmu;
	/* Always present mem resource */
	int num_res = 1;

	/* Retrieve SMMUv3 specific data */
	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;

	if (smmu->event_gsiv)
		num_res++;

	if (smmu->pri_gsiv)
		num_res++;

	if (smmu->gerr_gsiv)
		num_res++;

	if (smmu->sync_gsiv)
		num_res++;

	return num_res;
}

static bool arm_smmu_v3_is_combined_irq(struct acpi_iort_smmu_v3 *smmu)
{
	/*
	 * Cavium ThunderX2 implementation doesn't not support unique
	 * irq line. Use single irq line for all the SMMUv3 interrupts.
	 */
	if (smmu->model != ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
		return false;

	/*
	 * ThunderX2 doesn't support MSIs from the SMMU, so we're checking
	 * SPI numbers here.
	 */
	return smmu->event_gsiv == smmu->pri_gsiv &&
	       smmu->event_gsiv == smmu->gerr_gsiv &&
	       smmu->event_gsiv == smmu->sync_gsiv;
}

static unsigned long arm_smmu_v3_resource_size(struct acpi_iort_smmu_v3 *smmu)
{
	/*
	 * Override the size, for Cavium ThunderX2 implementation
	 * which doesn't support the page 1 SMMU register space.
	 */
	if (smmu->model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
		return SZ_64K;

	return SZ_128K;
}

static void __init arm_smmu_v3_init_resources(struct resource *res,
					      struct acpi_iort_node *node)
{
	struct acpi_iort_smmu_v3 *smmu;
	int num_res = 0;

	/* Retrieve SMMUv3 specific data */
	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;

	res[num_res].start = smmu->base_address;
	res[num_res].end = smmu->base_address +
				arm_smmu_v3_resource_size(smmu) - 1;
	res[num_res].flags = IORESOURCE_MEM;

	num_res++;
	if (arm_smmu_v3_is_combined_irq(smmu)) {
		if (smmu->event_gsiv)
			acpi_iort_register_irq(smmu->event_gsiv, "combined",
					       ACPI_EDGE_SENSITIVE,
					       &res[num_res++]);
	} else {

		if (smmu->event_gsiv)
			acpi_iort_register_irq(smmu->event_gsiv, "eventq",
					       ACPI_EDGE_SENSITIVE,
					       &res[num_res++]);

		if (smmu->pri_gsiv)
			acpi_iort_register_irq(smmu->pri_gsiv, "priq",
					       ACPI_EDGE_SENSITIVE,
					       &res[num_res++]);

		if (smmu->gerr_gsiv)
			acpi_iort_register_irq(smmu->gerr_gsiv, "gerror",
					       ACPI_EDGE_SENSITIVE,
					       &res[num_res++]);

		if (smmu->sync_gsiv)
			acpi_iort_register_irq(smmu->sync_gsiv, "cmdq-sync",
					       ACPI_EDGE_SENSITIVE,
					       &res[num_res++]);
	}
}

static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
{
	struct acpi_iort_smmu_v3 *smmu;

	/* Retrieve SMMUv3 specific data */
	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;

	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
}

#if defined(CONFIG_ACPI_NUMA)
/*
 * set numa proximity domain for smmuv3 device
 */
static void  __init arm_smmu_v3_set_proximity(struct device *dev,
					      struct acpi_iort_node *node)
{
	struct acpi_iort_smmu_v3 *smmu;

	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
	if (smmu->flags & ACPI_IORT_SMMU_V3_PXM_VALID) {
		set_dev_node(dev, acpi_map_pxm_to_node(smmu->pxm));
		pr_info("SMMU-v3[%llx] Mapped to Proximity domain %d\n",
			smmu->base_address,
			smmu->pxm);
	}
}
#else
#define arm_smmu_v3_set_proximity NULL
#endif

static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
{
	struct acpi_iort_smmu *smmu;

	/* Retrieve SMMU specific data */
	smmu = (struct acpi_iort_smmu *)node->node_data;

	/*
	 * Only consider the global fault interrupt and ignore the
	 * configuration access interrupt.
	 *
	 * MMIO address and global fault interrupt resources are always
	 * present so add them to the context interrupt count as a static
	 * value.
	 */
	return smmu->context_interrupt_count + 2;
}

static void __init arm_smmu_init_resources(struct resource *res,
					   struct acpi_iort_node *node)
{
	struct acpi_iort_smmu *smmu;
	int i, hw_irq, trigger, num_res = 0;
	u64 *ctx_irq, *glb_irq;

	/* Retrieve SMMU specific data */
	smmu = (struct acpi_iort_smmu *)node->node_data;

	res[num_res].start = smmu->base_address;
	res[num_res].end = smmu->base_address + smmu->span - 1;
	res[num_res].flags = IORESOURCE_MEM;
	num_res++;

	glb_irq = ACPI_ADD_PTR(u64, node, smmu->global_interrupt_offset);
	/* Global IRQs */
	hw_irq = IORT_IRQ_MASK(glb_irq[0]);
	trigger = IORT_IRQ_TRIGGER_MASK(glb_irq[0]);

	acpi_iort_register_irq(hw_irq, "arm-smmu-global", trigger,
				     &res[num_res++]);

	/* Context IRQs */
	ctx_irq = ACPI_ADD_PTR(u64, node, smmu->context_interrupt_offset);
	for (i = 0; i < smmu->context_interrupt_count; i++) {
		hw_irq = IORT_IRQ_MASK(ctx_irq[i]);
		trigger = IORT_IRQ_TRIGGER_MASK(ctx_irq[i]);

		acpi_iort_register_irq(hw_irq, "arm-smmu-context", trigger,
				       &res[num_res++]);
	}
}

static bool __init arm_smmu_is_coherent(struct acpi_iort_node *node)
{
	struct acpi_iort_smmu *smmu;

	/* Retrieve SMMU specific data */
	smmu = (struct acpi_iort_smmu *)node->node_data;

	return smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK;
}

struct iort_dev_config {
	const char *name;
	int (*dev_init)(struct acpi_iort_node *node);
	bool (*dev_is_coherent)(struct acpi_iort_node *node);
	int (*dev_count_resources)(struct acpi_iort_node *node);
	void (*dev_init_resources)(struct resource *res,
				     struct acpi_iort_node *node);
	void (*dev_set_proximity)(struct device *dev,
				    struct acpi_iort_node *node);
};

static const struct iort_dev_config iort_arm_smmu_v3_cfg __initconst = {
	.name = "arm-smmu-v3",
	.dev_is_coherent = arm_smmu_v3_is_coherent,
	.dev_count_resources = arm_smmu_v3_count_resources,
	.dev_init_resources = arm_smmu_v3_init_resources,
	.dev_set_proximity = arm_smmu_v3_set_proximity,
};

static const struct iort_dev_config iort_arm_smmu_cfg __initconst = {
	.name = "arm-smmu",
	.dev_is_coherent = arm_smmu_is_coherent,
	.dev_count_resources = arm_smmu_count_resources,
	.dev_init_resources = arm_smmu_init_resources
};

static __init const struct iort_dev_config *iort_get_dev_cfg(
			struct acpi_iort_node *node)
{
	switch (node->type) {
	case ACPI_IORT_NODE_SMMU_V3:
		return &iort_arm_smmu_v3_cfg;
	case ACPI_IORT_NODE_SMMU:
		return &iort_arm_smmu_cfg;
	default:
		return NULL;
	}
}

/**
 * iort_add_platform_device() - Allocate a platform device for IORT node
 * @node: Pointer to device ACPI IORT node
 *
 * Returns: 0 on success, <0 failure
 */
static int __init iort_add_platform_device(struct acpi_iort_node *node,
					   const struct iort_dev_config *ops)
{
	struct fwnode_handle *fwnode;
	struct platform_device *pdev;
	struct resource *r;
	enum dev_dma_attr attr;
	int ret, count;

	pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
	if (!pdev)
		return -ENOMEM;

	if (ops->dev_set_proximity)
		ops->dev_set_proximity(&pdev->dev, node);

	count = ops->dev_count_resources(node);

	r = kcalloc(count, sizeof(*r), GFP_KERNEL);
	if (!r) {
		ret = -ENOMEM;
		goto dev_put;
	}

	ops->dev_init_resources(r, node);

	ret = platform_device_add_resources(pdev, r, count);
	/*
	 * Resources are duplicated in platform_device_add_resources,
	 * free their allocated memory
	 */
	kfree(r);

	if (ret)
		goto dev_put;

	/*
	 * Add a copy of IORT node pointer to platform_data to
	 * be used to retrieve IORT data information.
	 */
	ret = platform_device_add_data(pdev, &node, sizeof(node));
	if (ret)
		goto dev_put;

	/*
	 * We expect the dma masks to be equivalent for
	 * all SMMUs set-ups
	 */
	pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;

	fwnode = iort_get_fwnode(node);

	if (!fwnode) {
		ret = -ENODEV;
		goto dev_put;
	}

	pdev->dev.fwnode = fwnode;

	attr = ops->dev_is_coherent && ops->dev_is_coherent(node) ?
			DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;

	/* Configure DMA for the page table walker */
	acpi_dma_configure(&pdev->dev, attr);

	iort_set_device_domain(&pdev->dev, node);

	ret = platform_device_add(pdev);
	if (ret)
		goto dma_deconfigure;

	return 0;

dma_deconfigure:
	acpi_dma_deconfigure(&pdev->dev);
dev_put:
	platform_device_put(pdev);

	return ret;
}

static bool __init iort_enable_acs(struct acpi_iort_node *iort_node)
{
	if (iort_node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
		struct acpi_iort_node *parent;
		struct acpi_iort_id_mapping *map;
		int i;

		map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, iort_node,
				   iort_node->mapping_offset);

		for (i = 0; i < iort_node->mapping_count; i++, map++) {
			if (!map->output_reference)
				continue;

			parent = ACPI_ADD_PTR(struct acpi_iort_node,
					iort_table,  map->output_reference);
			/*
			 * If we detect a RC->SMMU mapping, make sure
			 * we enable ACS on the system.
			 */
			if ((parent->type == ACPI_IORT_NODE_SMMU) ||
				(parent->type == ACPI_IORT_NODE_SMMU_V3)) {
				pci_request_acs();
				return true;
			}
		}
	}

	return false;
}

static void __init iort_init_platform_devices(void)
{
	struct acpi_iort_node *iort_node, *iort_end;
	struct acpi_table_iort *iort;
	struct fwnode_handle *fwnode;
	int i, ret;
	bool acs_enabled = false;
	const struct iort_dev_config *ops;

	/*
	 * iort_table and iort both point to the start of IORT table, but
	 * have different struct types
	 */
	iort = (struct acpi_table_iort *)iort_table;

	/* Get the first IORT node */
	iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
				 iort->node_offset);
	iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort,
				iort_table->length);

	for (i = 0; i < iort->node_count; i++) {
		if (iort_node >= iort_end) {
			pr_err("iort node pointer overflows, bad table\n");
			return;
		}

		if (!acs_enabled)
			acs_enabled = iort_enable_acs(iort_node);

		ops = iort_get_dev_cfg(iort_node);
		if (ops) {
			fwnode = acpi_alloc_fwnode_static();
			if (!fwnode)
				return;

			iort_set_fwnode(iort_node, fwnode);

			ret = iort_add_platform_device(iort_node, ops);
			if (ret) {
				iort_delete_fwnode(iort_node);
				acpi_free_fwnode_static(fwnode);
				return;
			}
		}

		iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
					 iort_node->length);
	}
}

void __init acpi_iort_init(void)
{
	acpi_status status;

	status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND) {
			const char *msg = acpi_format_exception(status);

			pr_err("Failed to get table, %s\n", msg);
		}

		return;
	}

	iort_init_platform_devices();
}