summaryrefslogtreecommitdiff
path: root/include/linux/iommu.h
blob: ffaa389ea128a3d50b12fc64cce1c4156afefe92 (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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
 * Author: Joerg Roedel <joerg.roedel@amd.com>
 */

#ifndef __LINUX_IOMMU_H
#define __LINUX_IOMMU_H

#include <linux/scatterlist.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/ioasid.h>
#include <uapi/linux/iommu.h>

#define IOMMU_READ	(1 << 0)
#define IOMMU_WRITE	(1 << 1)
#define IOMMU_CACHE	(1 << 2) /* DMA cache coherency */
#define IOMMU_NOEXEC	(1 << 3)
#define IOMMU_MMIO	(1 << 4) /* e.g. things like MSI doorbells */
/*
 * Where the bus hardware includes a privilege level as part of its access type
 * markings, and certain devices are capable of issuing transactions marked as
 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
 * given permission flags only apply to accesses at the higher privilege level,
 * and that unprivileged transactions should have as little access as possible.
 * This would usually imply the same permissions as kernel mappings on the CPU,
 * if the IOMMU page table format is equivalent.
 */
#define IOMMU_PRIV	(1 << 5)

struct iommu_ops;
struct iommu_group;
struct bus_type;
struct device;
struct iommu_domain;
struct notifier_block;
struct iommu_sva;
struct iommu_fault_event;

/* iommu fault flags */
#define IOMMU_FAULT_READ	0x0
#define IOMMU_FAULT_WRITE	0x1

typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
			struct device *, unsigned long, int, void *);
typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);

struct iommu_domain_geometry {
	dma_addr_t aperture_start; /* First address that can be mapped    */
	dma_addr_t aperture_end;   /* Last address that can be mapped     */
	bool force_aperture;       /* DMA only allowed in mappable range? */
};

/* Domain feature flags */
#define __IOMMU_DOMAIN_PAGING	(1U << 0)  /* Support for iommu_map/unmap */
#define __IOMMU_DOMAIN_DMA_API	(1U << 1)  /* Domain for use in DMA-API
					      implementation              */
#define __IOMMU_DOMAIN_PT	(1U << 2)  /* Domain is identity mapped   */

/*
 * This are the possible domain-types
 *
 *	IOMMU_DOMAIN_BLOCKED	- All DMA is blocked, can be used to isolate
 *				  devices
 *	IOMMU_DOMAIN_IDENTITY	- DMA addresses are system physical addresses
 *	IOMMU_DOMAIN_UNMANAGED	- DMA mappings managed by IOMMU-API user, used
 *				  for VMs
 *	IOMMU_DOMAIN_DMA	- Internally used for DMA-API implementations.
 *				  This flag allows IOMMU drivers to implement
 *				  certain optimizations for these domains
 */
#define IOMMU_DOMAIN_BLOCKED	(0U)
#define IOMMU_DOMAIN_IDENTITY	(__IOMMU_DOMAIN_PT)
#define IOMMU_DOMAIN_UNMANAGED	(__IOMMU_DOMAIN_PAGING)
#define IOMMU_DOMAIN_DMA	(__IOMMU_DOMAIN_PAGING |	\
				 __IOMMU_DOMAIN_DMA_API)

struct iommu_domain {
	unsigned type;
	const struct iommu_ops *ops;
	unsigned long pgsize_bitmap;	/* Bitmap of page sizes in use */
	iommu_fault_handler_t handler;
	void *handler_token;
	struct iommu_domain_geometry geometry;
	void *iova_cookie;
};

enum iommu_cap {
	IOMMU_CAP_CACHE_COHERENCY,	/* IOMMU can enforce cache coherent DMA
					   transactions */
	IOMMU_CAP_INTR_REMAP,		/* IOMMU supports interrupt isolation */
	IOMMU_CAP_NOEXEC,		/* IOMMU_NOEXEC flag */
};

/*
 * Following constraints are specifc to FSL_PAMUV1:
 *  -aperture must be power of 2, and naturally aligned
 *  -number of windows must be power of 2, and address space size
 *   of each window is determined by aperture size / # of windows
 *  -the actual size of the mapped region of a window must be power
 *   of 2 starting with 4KB and physical address must be naturally
 *   aligned.
 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
 * The caller can invoke iommu_domain_get_attr to check if the underlying
 * iommu implementation supports these constraints.
 */

enum iommu_attr {
	DOMAIN_ATTR_GEOMETRY,
	DOMAIN_ATTR_PAGING,
	DOMAIN_ATTR_WINDOWS,
	DOMAIN_ATTR_FSL_PAMU_STASH,
	DOMAIN_ATTR_FSL_PAMU_ENABLE,
	DOMAIN_ATTR_FSL_PAMUV1,
	DOMAIN_ATTR_NESTING,	/* two stages of translation */
	DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
	DOMAIN_ATTR_IO_PGTABLE_CFG,
	DOMAIN_ATTR_MAX,
};

/* These are the possible reserved region types */
enum iommu_resv_type {
	/* Memory regions which must be mapped 1:1 at all times */
	IOMMU_RESV_DIRECT,
	/*
	 * Memory regions which are advertised to be 1:1 but are
	 * commonly considered relaxable in some conditions,
	 * for instance in device assignment use case (USB, Graphics)
	 */
	IOMMU_RESV_DIRECT_RELAXABLE,
	/* Arbitrary "never map this or give it to a device" address ranges */
	IOMMU_RESV_RESERVED,
	/* Hardware MSI region (untranslated) */
	IOMMU_RESV_MSI,
	/* Software-managed MSI translation window */
	IOMMU_RESV_SW_MSI,
};

/**
 * struct iommu_resv_region - descriptor for a reserved memory region
 * @list: Linked list pointers
 * @start: System physical start address of the region
 * @length: Length of the region in bytes
 * @prot: IOMMU Protection flags (READ/WRITE/...)
 * @type: Type of the reserved region
 */
struct iommu_resv_region {
	struct list_head	list;
	phys_addr_t		start;
	size_t			length;
	int			prot;
	enum iommu_resv_type	type;
};

/* Per device IOMMU features */
enum iommu_dev_features {
	IOMMU_DEV_FEAT_AUX,	/* Aux-domain feature */
	IOMMU_DEV_FEAT_SVA,	/* Shared Virtual Addresses */
};

#define IOMMU_PASID_INVALID	(-1U)

#ifdef CONFIG_IOMMU_API

/**
 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
 *
 * @start: IOVA representing the start of the range to be flushed
 * @end: IOVA representing the end of the range to be flushed (exclusive)
 * @pgsize: The interval at which to perform the flush
 *
 * This structure is intended to be updated by multiple calls to the
 * ->unmap() function in struct iommu_ops before eventually being passed
 * into ->iotlb_sync().
 */
struct iommu_iotlb_gather {
	unsigned long		start;
	unsigned long		end;
	size_t			pgsize;
};

/**
 * struct iommu_ops - iommu ops and capabilities
 * @capable: check capability
 * @domain_alloc: allocate iommu domain
 * @domain_free: free iommu domain
 * @attach_dev: attach device to an iommu domain
 * @detach_dev: detach device from an iommu domain
 * @map: map a physically contiguous memory region to an iommu domain
 * @unmap: unmap a physically contiguous memory region from an iommu domain
 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
 *            queue
 * @iova_to_phys: translate iova to physical address
 * @probe_device: Add device to iommu driver handling
 * @release_device: Remove device from iommu driver handling
 * @probe_finalize: Do final setup work after the device is added to an IOMMU
 *                  group and attached to the groups domain
 * @device_group: find iommu group for a particular device
 * @domain_get_attr: Query domain attributes
 * @domain_set_attr: Change domain attributes
 * @get_resv_regions: Request list of reserved regions for a device
 * @put_resv_regions: Free list of reserved regions for a device
 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 * @domain_window_enable: Configure and enable a particular window for a domain
 * @domain_window_disable: Disable a particular window for a domain
 * @of_xlate: add OF master IDs to iommu grouping
 * @is_attach_deferred: Check if domain attach should be deferred from iommu
 *                      driver init to device driver init (default no)
 * @dev_has/enable/disable_feat: per device entries to check/enable/disable
 *                               iommu specific features.
 * @dev_feat_enabled: check enabled feature
 * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
 * @aux_get_pasid: get the pasid given an aux-domain
 * @sva_bind: Bind process address space to device
 * @sva_unbind: Unbind process address space from device
 * @sva_get_pasid: Get PASID associated to a SVA handle
 * @page_response: handle page request response
 * @cache_invalidate: invalidate translation caches
 * @sva_bind_gpasid: bind guest pasid and mm
 * @sva_unbind_gpasid: unbind guest pasid and mm
 * @def_domain_type: device default domain type, return value:
 *		- IOMMU_DOMAIN_IDENTITY: must use an identity domain
 *		- IOMMU_DOMAIN_DMA: must use a dma domain
 *		- 0: use the default setting
 * @pgsize_bitmap: bitmap of all possible supported page sizes
 * @owner: Driver module providing these ops
 */
struct iommu_ops {
	bool (*capable)(enum iommu_cap);

	/* Domain allocation and freeing by the iommu driver */
	struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
	void (*domain_free)(struct iommu_domain *);

	int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
	int (*map)(struct iommu_domain *domain, unsigned long iova,
		   phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
	size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
		     size_t size, struct iommu_iotlb_gather *iotlb_gather);
	void (*flush_iotlb_all)(struct iommu_domain *domain);
	void (*iotlb_sync_map)(struct iommu_domain *domain);
	void (*iotlb_sync)(struct iommu_domain *domain,
			   struct iommu_iotlb_gather *iotlb_gather);
	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
	struct iommu_device *(*probe_device)(struct device *dev);
	void (*release_device)(struct device *dev);
	void (*probe_finalize)(struct device *dev);
	struct iommu_group *(*device_group)(struct device *dev);
	int (*domain_get_attr)(struct iommu_domain *domain,
			       enum iommu_attr attr, void *data);
	int (*domain_set_attr)(struct iommu_domain *domain,
			       enum iommu_attr attr, void *data);

	/* Request/Free a list of reserved regions for a device */
	void (*get_resv_regions)(struct device *dev, struct list_head *list);
	void (*put_resv_regions)(struct device *dev, struct list_head *list);
	void (*apply_resv_region)(struct device *dev,
				  struct iommu_domain *domain,
				  struct iommu_resv_region *region);

	/* Window handling functions */
	int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
				    phys_addr_t paddr, u64 size, int prot);
	void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);

	int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
	bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);

	/* Per device IOMMU features */
	bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
	bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
	int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
	int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);

	/* Aux-domain specific attach/detach entries */
	int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
	void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
	int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);

	struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
				      void *drvdata);
	void (*sva_unbind)(struct iommu_sva *handle);
	u32 (*sva_get_pasid)(struct iommu_sva *handle);

	int (*page_response)(struct device *dev,
			     struct iommu_fault_event *evt,
			     struct iommu_page_response *msg);
	int (*cache_invalidate)(struct iommu_domain *domain, struct device *dev,
				struct iommu_cache_invalidate_info *inv_info);
	int (*sva_bind_gpasid)(struct iommu_domain *domain,
			struct device *dev, struct iommu_gpasid_bind_data *data);

	int (*sva_unbind_gpasid)(struct device *dev, u32 pasid);

	int (*def_domain_type)(struct device *dev);

	unsigned long pgsize_bitmap;
	struct module *owner;
};

/**
 * struct iommu_device - IOMMU core representation of one IOMMU hardware
 *			 instance
 * @list: Used by the iommu-core to keep a list of registered iommus
 * @ops: iommu-ops for talking to this iommu
 * @dev: struct device for sysfs handling
 */
struct iommu_device {
	struct list_head list;
	const struct iommu_ops *ops;
	struct fwnode_handle *fwnode;
	struct device *dev;
};

/**
 * struct iommu_fault_event - Generic fault event
 *
 * Can represent recoverable faults such as a page requests or
 * unrecoverable faults such as DMA or IRQ remapping faults.
 *
 * @fault: fault descriptor
 * @list: pending fault event list, used for tracking responses
 */
struct iommu_fault_event {
	struct iommu_fault fault;
	struct list_head list;
};

/**
 * struct iommu_fault_param - per-device IOMMU fault data
 * @handler: Callback function to handle IOMMU faults at device level
 * @data: handler private data
 * @faults: holds the pending faults which needs response
 * @lock: protect pending faults list
 */
struct iommu_fault_param {
	iommu_dev_fault_handler_t handler;
	void *data;
	struct list_head faults;
	struct mutex lock;
};

/**
 * struct dev_iommu - Collection of per-device IOMMU data
 *
 * @fault_param: IOMMU detected device fault reporting data
 * @fwspec:	 IOMMU fwspec data
 * @iommu_dev:	 IOMMU device this device is linked to
 * @priv:	 IOMMU Driver private data
 *
 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
 *	struct iommu_group	*iommu_group;
 */
struct dev_iommu {
	struct mutex lock;
	struct iommu_fault_param	*fault_param;
	struct iommu_fwspec		*fwspec;
	struct iommu_device		*iommu_dev;
	void				*priv;
};

int  iommu_device_register(struct iommu_device *iommu);
void iommu_device_unregister(struct iommu_device *iommu);
int  iommu_device_sysfs_add(struct iommu_device *iommu,
			    struct device *parent,
			    const struct attribute_group **groups,
			    const char *fmt, ...) __printf(4, 5);
void iommu_device_sysfs_remove(struct iommu_device *iommu);
int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
void iommu_device_unlink(struct iommu_device *iommu, struct device *link);

static inline void __iommu_device_set_ops(struct iommu_device *iommu,
					  const struct iommu_ops *ops)
{
	iommu->ops = ops;
}

#define iommu_device_set_ops(iommu, ops)				\
do {									\
	struct iommu_ops *__ops = (struct iommu_ops *)(ops);		\
	__ops->owner = THIS_MODULE;					\
	__iommu_device_set_ops(iommu, __ops);				\
} while (0)

static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
					   struct fwnode_handle *fwnode)
{
	iommu->fwnode = fwnode;
}

static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
{
	return (struct iommu_device *)dev_get_drvdata(dev);
}

static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
{
	*gather = (struct iommu_iotlb_gather) {
		.start	= ULONG_MAX,
	};
}

#define IOMMU_GROUP_NOTIFY_ADD_DEVICE		1 /* Device added */
#define IOMMU_GROUP_NOTIFY_DEL_DEVICE		2 /* Pre Device removed */
#define IOMMU_GROUP_NOTIFY_BIND_DRIVER		3 /* Pre Driver bind */
#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER		4 /* Post Driver bind */
#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER	5 /* Pre Driver unbind */
#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER	6 /* Post Driver unbind */

extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
extern int bus_iommu_probe(struct bus_type *bus);
extern bool iommu_present(struct bus_type *bus);
extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
extern struct iommu_group *iommu_group_get_by_id(int id);
extern void iommu_domain_free(struct iommu_domain *domain);
extern int iommu_attach_device(struct iommu_domain *domain,
			       struct device *dev);
extern void iommu_detach_device(struct iommu_domain *domain,
				struct device *dev);
extern int iommu_uapi_cache_invalidate(struct iommu_domain *domain,
				       struct device *dev,
				       void __user *uinfo);

extern int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
				      struct device *dev, void __user *udata);
extern int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
					struct device *dev, void __user *udata);
extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
				   struct device *dev, ioasid_t pasid);
extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
		     phys_addr_t paddr, size_t size, int prot);
extern int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova,
			    phys_addr_t paddr, size_t size, int prot);
extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
			  size_t size);
extern size_t iommu_unmap_fast(struct iommu_domain *domain,
			       unsigned long iova, size_t size,
			       struct iommu_iotlb_gather *iotlb_gather);
extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
			   struct scatterlist *sg,unsigned int nents, int prot);
extern size_t iommu_map_sg_atomic(struct iommu_domain *domain,
				  unsigned long iova, struct scatterlist *sg,
				  unsigned int nents, int prot);
extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
extern void iommu_set_fault_handler(struct iommu_domain *domain,
			iommu_fault_handler_t handler, void *token);

extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
extern void generic_iommu_put_resv_regions(struct device *dev,
					   struct list_head *list);
extern void iommu_set_default_passthrough(bool cmd_line);
extern void iommu_set_default_translated(bool cmd_line);
extern bool iommu_default_passthrough(void);
extern struct iommu_resv_region *
iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
			enum iommu_resv_type type);
extern int iommu_get_group_resv_regions(struct iommu_group *group,
					struct list_head *head);

extern int iommu_attach_group(struct iommu_domain *domain,
			      struct iommu_group *group);
extern void iommu_detach_group(struct iommu_domain *domain,
			       struct iommu_group *group);
extern struct iommu_group *iommu_group_alloc(void);
extern void *iommu_group_get_iommudata(struct iommu_group *group);
extern void iommu_group_set_iommudata(struct iommu_group *group,
				      void *iommu_data,
				      void (*release)(void *iommu_data));
extern int iommu_group_set_name(struct iommu_group *group, const char *name);
extern int iommu_group_add_device(struct iommu_group *group,
				  struct device *dev);
extern void iommu_group_remove_device(struct device *dev);
extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
				    int (*fn)(struct device *, void *));
extern struct iommu_group *iommu_group_get(struct device *dev);
extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
extern void iommu_group_put(struct iommu_group *group);
extern int iommu_group_register_notifier(struct iommu_group *group,
					 struct notifier_block *nb);
extern int iommu_group_unregister_notifier(struct iommu_group *group,
					   struct notifier_block *nb);
extern int iommu_register_device_fault_handler(struct device *dev,
					iommu_dev_fault_handler_t handler,
					void *data);

extern int iommu_unregister_device_fault_handler(struct device *dev);

extern int iommu_report_device_fault(struct device *dev,
				     struct iommu_fault_event *evt);
extern int iommu_page_response(struct device *dev,
			       struct iommu_page_response *msg);

extern int iommu_group_id(struct iommu_group *group);
extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);

extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
				 void *data);
extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
				 void *data);

/* Window handling function prototypes */
extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
				      phys_addr_t offset, u64 size,
				      int prot);
extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);

extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
			      unsigned long iova, int flags);

static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
{
	if (domain->ops->flush_iotlb_all)
		domain->ops->flush_iotlb_all(domain);
}

static inline void iommu_iotlb_sync(struct iommu_domain *domain,
				  struct iommu_iotlb_gather *iotlb_gather)
{
	if (domain->ops->iotlb_sync)
		domain->ops->iotlb_sync(domain, iotlb_gather);

	iommu_iotlb_gather_init(iotlb_gather);
}

static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
					       struct iommu_iotlb_gather *gather,
					       unsigned long iova, size_t size)
{
	unsigned long start = iova, end = start + size;

	/*
	 * If the new page is disjoint from the current range or is mapped at
	 * a different granularity, then sync the TLB so that the gather
	 * structure can be rewritten.
	 */
	if (gather->pgsize != size ||
	    end < gather->start || start > gather->end) {
		if (gather->pgsize)
			iommu_iotlb_sync(domain, gather);
		gather->pgsize = size;
	}

	if (gather->end < end)
		gather->end = end;

	if (gather->start > start)
		gather->start = start;
}

/* PCI device grouping function */
extern struct iommu_group *pci_device_group(struct device *dev);
/* Generic device grouping function */
extern struct iommu_group *generic_device_group(struct device *dev);
/* FSL-MC device grouping function */
struct iommu_group *fsl_mc_device_group(struct device *dev);

/**
 * struct iommu_fwspec - per-device IOMMU instance data
 * @ops: ops for this device's IOMMU
 * @iommu_fwnode: firmware handle for this device's IOMMU
 * @iommu_priv: IOMMU driver private data for this device
 * @num_pasid_bits: number of PASID bits supported by this device
 * @num_ids: number of associated device IDs
 * @ids: IDs which this device may present to the IOMMU
 */
struct iommu_fwspec {
	const struct iommu_ops	*ops;
	struct fwnode_handle	*iommu_fwnode;
	u32			flags;
	u32			num_pasid_bits;
	unsigned int		num_ids;
	u32			ids[];
};

/* ATS is supported */
#define IOMMU_FWSPEC_PCI_RC_ATS			(1 << 0)

/**
 * struct iommu_sva - handle to a device-mm bond
 */
struct iommu_sva {
	struct device			*dev;
};

int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
		      const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);
int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);

static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
{
	if (dev->iommu)
		return dev->iommu->fwspec;
	else
		return NULL;
}

static inline void dev_iommu_fwspec_set(struct device *dev,
					struct iommu_fwspec *fwspec)
{
	dev->iommu->fwspec = fwspec;
}

static inline void *dev_iommu_priv_get(struct device *dev)
{
	return dev->iommu->priv;
}

static inline void dev_iommu_priv_set(struct device *dev, void *priv)
{
	dev->iommu->priv = priv;
}

int iommu_probe_device(struct device *dev);
void iommu_release_device(struct device *dev);

bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);

struct iommu_sva *iommu_sva_bind_device(struct device *dev,
					struct mm_struct *mm,
					void *drvdata);
void iommu_sva_unbind_device(struct iommu_sva *handle);
u32 iommu_sva_get_pasid(struct iommu_sva *handle);

#else /* CONFIG_IOMMU_API */

struct iommu_ops {};
struct iommu_group {};
struct iommu_fwspec {};
struct iommu_device {};
struct iommu_fault_param {};
struct iommu_iotlb_gather {};

static inline bool iommu_present(struct bus_type *bus)
{
	return false;
}

static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
{
	return false;
}

static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
{
	return NULL;
}

static inline struct iommu_group *iommu_group_get_by_id(int id)
{
	return NULL;
}

static inline void iommu_domain_free(struct iommu_domain *domain)
{
}

static inline int iommu_attach_device(struct iommu_domain *domain,
				      struct device *dev)
{
	return -ENODEV;
}

static inline void iommu_detach_device(struct iommu_domain *domain,
				       struct device *dev)
{
}

static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
{
	return NULL;
}

static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
			    phys_addr_t paddr, size_t size, int prot)
{
	return -ENODEV;
}

static inline int iommu_map_atomic(struct iommu_domain *domain,
				   unsigned long iova, phys_addr_t paddr,
				   size_t size, int prot)
{
	return -ENODEV;
}

static inline size_t iommu_unmap(struct iommu_domain *domain,
				 unsigned long iova, size_t size)
{
	return 0;
}

static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
				      unsigned long iova, int gfp_order,
				      struct iommu_iotlb_gather *iotlb_gather)
{
	return 0;
}

static inline size_t iommu_map_sg(struct iommu_domain *domain,
				  unsigned long iova, struct scatterlist *sg,
				  unsigned int nents, int prot)
{
	return 0;
}

static inline size_t iommu_map_sg_atomic(struct iommu_domain *domain,
				  unsigned long iova, struct scatterlist *sg,
				  unsigned int nents, int prot)
{
	return 0;
}

static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
{
}

static inline void iommu_iotlb_sync(struct iommu_domain *domain,
				  struct iommu_iotlb_gather *iotlb_gather)
{
}

static inline int iommu_domain_window_enable(struct iommu_domain *domain,
					     u32 wnd_nr, phys_addr_t paddr,
					     u64 size, int prot)
{
	return -ENODEV;
}

static inline void iommu_domain_window_disable(struct iommu_domain *domain,
					       u32 wnd_nr)
{
}

static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
{
	return 0;
}

static inline void iommu_set_fault_handler(struct iommu_domain *domain,
				iommu_fault_handler_t handler, void *token)
{
}

static inline void iommu_get_resv_regions(struct device *dev,
					struct list_head *list)
{
}

static inline void iommu_put_resv_regions(struct device *dev,
					struct list_head *list)
{
}

static inline int iommu_get_group_resv_regions(struct iommu_group *group,
					       struct list_head *head)
{
	return -ENODEV;
}

static inline void iommu_set_default_passthrough(bool cmd_line)
{
}

static inline void iommu_set_default_translated(bool cmd_line)
{
}

static inline bool iommu_default_passthrough(void)
{
	return true;
}

static inline int iommu_attach_group(struct iommu_domain *domain,
				     struct iommu_group *group)
{
	return -ENODEV;
}

static inline void iommu_detach_group(struct iommu_domain *domain,
				      struct iommu_group *group)
{
}

static inline struct iommu_group *iommu_group_alloc(void)
{
	return ERR_PTR(-ENODEV);
}

static inline void *iommu_group_get_iommudata(struct iommu_group *group)
{
	return NULL;
}

static inline void iommu_group_set_iommudata(struct iommu_group *group,
					     void *iommu_data,
					     void (*release)(void *iommu_data))
{
}

static inline int iommu_group_set_name(struct iommu_group *group,
				       const char *name)
{
	return -ENODEV;
}

static inline int iommu_group_add_device(struct iommu_group *group,
					 struct device *dev)
{
	return -ENODEV;
}

static inline void iommu_group_remove_device(struct device *dev)
{
}

static inline int iommu_group_for_each_dev(struct iommu_group *group,
					   void *data,
					   int (*fn)(struct device *, void *))
{
	return -ENODEV;
}

static inline struct iommu_group *iommu_group_get(struct device *dev)
{
	return NULL;
}

static inline void iommu_group_put(struct iommu_group *group)
{
}

static inline int iommu_group_register_notifier(struct iommu_group *group,
						struct notifier_block *nb)
{
	return -ENODEV;
}

static inline int iommu_group_unregister_notifier(struct iommu_group *group,
						  struct notifier_block *nb)
{
	return 0;
}

static inline
int iommu_register_device_fault_handler(struct device *dev,
					iommu_dev_fault_handler_t handler,
					void *data)
{
	return -ENODEV;
}

static inline int iommu_unregister_device_fault_handler(struct device *dev)
{
	return 0;
}

static inline
int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
{
	return -ENODEV;
}

static inline int iommu_page_response(struct device *dev,
				      struct iommu_page_response *msg)
{
	return -ENODEV;
}

static inline int iommu_group_id(struct iommu_group *group)
{
	return -ENODEV;
}

static inline int iommu_domain_get_attr(struct iommu_domain *domain,
					enum iommu_attr attr, void *data)
{
	return -EINVAL;
}

static inline int iommu_domain_set_attr(struct iommu_domain *domain,
					enum iommu_attr attr, void *data)
{
	return -EINVAL;
}

static inline int  iommu_device_register(struct iommu_device *iommu)
{
	return -ENODEV;
}

static inline void iommu_device_set_ops(struct iommu_device *iommu,
					const struct iommu_ops *ops)
{
}

static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
					   struct fwnode_handle *fwnode)
{
}

static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
{
	return NULL;
}

static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
{
}

static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
					       struct iommu_iotlb_gather *gather,
					       unsigned long iova, size_t size)
{
}

static inline void iommu_device_unregister(struct iommu_device *iommu)
{
}

static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
					  struct device *parent,
					  const struct attribute_group **groups,
					  const char *fmt, ...)
{
	return -ENODEV;
}

static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
{
}

static inline int iommu_device_link(struct device *dev, struct device *link)
{
	return -EINVAL;
}

static inline void iommu_device_unlink(struct device *dev, struct device *link)
{
}

static inline int iommu_fwspec_init(struct device *dev,
				    struct fwnode_handle *iommu_fwnode,
				    const struct iommu_ops *ops)
{
	return -ENODEV;
}

static inline void iommu_fwspec_free(struct device *dev)
{
}

static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
				       int num_ids)
{
	return -ENODEV;
}

static inline
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
{
	return NULL;
}

static inline bool
iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
{
	return false;
}

static inline bool
iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
{
	return false;
}

static inline int
iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
	return -ENODEV;
}

static inline int
iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
{
	return -ENODEV;
}

static inline int
iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
{
	return -ENODEV;
}

static inline void
iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
{
}

static inline int
iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
{
	return -ENODEV;
}

static inline struct iommu_sva *
iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
{
	return NULL;
}

static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
{
}

static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
{
	return IOMMU_PASID_INVALID;
}

static inline int
iommu_uapi_cache_invalidate(struct iommu_domain *domain,
			    struct device *dev,
			    struct iommu_cache_invalidate_info *inv_info)
{
	return -ENODEV;
}

static inline int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
					     struct device *dev, void __user *udata)
{
	return -ENODEV;
}

static inline int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
					       struct device *dev, void __user *udata)
{
	return -ENODEV;
}

static inline int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
					  struct device *dev,
					  ioasid_t pasid)
{
	return -ENODEV;
}

static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
{
	return NULL;
}
#endif /* CONFIG_IOMMU_API */

/**
 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
 * @domain:	The IOMMU domain to perform the mapping
 * @iova:	The start address to map the buffer
 * @sgt:	The sg_table object describing the buffer
 * @prot:	IOMMU protection bits
 *
 * Creates a mapping at @iova for the buffer described by a scatterlist
 * stored in the given sg_table object in the provided IOMMU domain.
 */
static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
			unsigned long iova, struct sg_table *sgt, int prot)
{
	return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot);
}

#ifdef CONFIG_IOMMU_DEBUGFS
extern	struct dentry *iommu_debugfs_dir;
void iommu_debugfs_setup(void);
#else
static inline void iommu_debugfs_setup(void) {}
#endif

#endif /* __LINUX_IOMMU_H */