Linux kernel mirror (for testing)
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linux
1/*
2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19#ifndef __LINUX_IOMMU_H
20#define __LINUX_IOMMU_H
21
22#include <linux/scatterlist.h>
23#include <linux/device.h>
24#include <linux/types.h>
25#include <linux/errno.h>
26#include <linux/err.h>
27#include <linux/of.h>
28
29#define IOMMU_READ (1 << 0)
30#define IOMMU_WRITE (1 << 1)
31#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
32#define IOMMU_NOEXEC (1 << 3)
33#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
34/*
35 * Where the bus hardware includes a privilege level as part of its access type
36 * markings, and certain devices are capable of issuing transactions marked as
37 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
38 * given permission flags only apply to accesses at the higher privilege level,
39 * and that unprivileged transactions should have as little access as possible.
40 * This would usually imply the same permissions as kernel mappings on the CPU,
41 * if the IOMMU page table format is equivalent.
42 */
43#define IOMMU_PRIV (1 << 5)
44
45struct iommu_ops;
46struct iommu_group;
47struct bus_type;
48struct device;
49struct iommu_domain;
50struct notifier_block;
51
52/* iommu fault flags */
53#define IOMMU_FAULT_READ 0x0
54#define IOMMU_FAULT_WRITE 0x1
55
56typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
57 struct device *, unsigned long, int, void *);
58
59struct iommu_domain_geometry {
60 dma_addr_t aperture_start; /* First address that can be mapped */
61 dma_addr_t aperture_end; /* Last address that can be mapped */
62 bool force_aperture; /* DMA only allowed in mappable range? */
63};
64
65/* Domain feature flags */
66#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
67#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
68 implementation */
69#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
70
71/*
72 * This are the possible domain-types
73 *
74 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
75 * devices
76 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
77 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
78 * for VMs
79 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
80 * This flag allows IOMMU drivers to implement
81 * certain optimizations for these domains
82 */
83#define IOMMU_DOMAIN_BLOCKED (0U)
84#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
85#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
86#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
87 __IOMMU_DOMAIN_DMA_API)
88
89struct iommu_domain {
90 unsigned type;
91 const struct iommu_ops *ops;
92 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
93 iommu_fault_handler_t handler;
94 void *handler_token;
95 struct iommu_domain_geometry geometry;
96 void *iova_cookie;
97};
98
99enum iommu_cap {
100 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
101 transactions */
102 IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
103 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
104};
105
106/*
107 * Following constraints are specifc to FSL_PAMUV1:
108 * -aperture must be power of 2, and naturally aligned
109 * -number of windows must be power of 2, and address space size
110 * of each window is determined by aperture size / # of windows
111 * -the actual size of the mapped region of a window must be power
112 * of 2 starting with 4KB and physical address must be naturally
113 * aligned.
114 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
115 * The caller can invoke iommu_domain_get_attr to check if the underlying
116 * iommu implementation supports these constraints.
117 */
118
119enum iommu_attr {
120 DOMAIN_ATTR_GEOMETRY,
121 DOMAIN_ATTR_PAGING,
122 DOMAIN_ATTR_WINDOWS,
123 DOMAIN_ATTR_FSL_PAMU_STASH,
124 DOMAIN_ATTR_FSL_PAMU_ENABLE,
125 DOMAIN_ATTR_FSL_PAMUV1,
126 DOMAIN_ATTR_NESTING, /* two stages of translation */
127 DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
128 DOMAIN_ATTR_MAX,
129};
130
131/* These are the possible reserved region types */
132enum iommu_resv_type {
133 /* Memory regions which must be mapped 1:1 at all times */
134 IOMMU_RESV_DIRECT,
135 /* Arbitrary "never map this or give it to a device" address ranges */
136 IOMMU_RESV_RESERVED,
137 /* Hardware MSI region (untranslated) */
138 IOMMU_RESV_MSI,
139 /* Software-managed MSI translation window */
140 IOMMU_RESV_SW_MSI,
141};
142
143/**
144 * struct iommu_resv_region - descriptor for a reserved memory region
145 * @list: Linked list pointers
146 * @start: System physical start address of the region
147 * @length: Length of the region in bytes
148 * @prot: IOMMU Protection flags (READ/WRITE/...)
149 * @type: Type of the reserved region
150 */
151struct iommu_resv_region {
152 struct list_head list;
153 phys_addr_t start;
154 size_t length;
155 int prot;
156 enum iommu_resv_type type;
157};
158
159#ifdef CONFIG_IOMMU_API
160
161/**
162 * struct iommu_ops - iommu ops and capabilities
163 * @capable: check capability
164 * @domain_alloc: allocate iommu domain
165 * @domain_free: free iommu domain
166 * @attach_dev: attach device to an iommu domain
167 * @detach_dev: detach device from an iommu domain
168 * @map: map a physically contiguous memory region to an iommu domain
169 * @unmap: unmap a physically contiguous memory region from an iommu domain
170 * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain
171 * @tlb_range_add: Add a given iova range to the flush queue for this domain
172 * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
173 * queue
174 * @iova_to_phys: translate iova to physical address
175 * @add_device: add device to iommu grouping
176 * @remove_device: remove device from iommu grouping
177 * @device_group: find iommu group for a particular device
178 * @domain_get_attr: Query domain attributes
179 * @domain_set_attr: Change domain attributes
180 * @get_resv_regions: Request list of reserved regions for a device
181 * @put_resv_regions: Free list of reserved regions for a device
182 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
183 * @domain_window_enable: Configure and enable a particular window for a domain
184 * @domain_window_disable: Disable a particular window for a domain
185 * @of_xlate: add OF master IDs to iommu grouping
186 * @pgsize_bitmap: bitmap of all possible supported page sizes
187 */
188struct iommu_ops {
189 bool (*capable)(enum iommu_cap);
190
191 /* Domain allocation and freeing by the iommu driver */
192 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
193 void (*domain_free)(struct iommu_domain *);
194
195 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
196 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
197 int (*map)(struct iommu_domain *domain, unsigned long iova,
198 phys_addr_t paddr, size_t size, int prot);
199 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
200 size_t size);
201 void (*flush_iotlb_all)(struct iommu_domain *domain);
202 void (*iotlb_range_add)(struct iommu_domain *domain,
203 unsigned long iova, size_t size);
204 void (*iotlb_sync)(struct iommu_domain *domain);
205 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
206 int (*add_device)(struct device *dev);
207 void (*remove_device)(struct device *dev);
208 struct iommu_group *(*device_group)(struct device *dev);
209 int (*domain_get_attr)(struct iommu_domain *domain,
210 enum iommu_attr attr, void *data);
211 int (*domain_set_attr)(struct iommu_domain *domain,
212 enum iommu_attr attr, void *data);
213
214 /* Request/Free a list of reserved regions for a device */
215 void (*get_resv_regions)(struct device *dev, struct list_head *list);
216 void (*put_resv_regions)(struct device *dev, struct list_head *list);
217 void (*apply_resv_region)(struct device *dev,
218 struct iommu_domain *domain,
219 struct iommu_resv_region *region);
220
221 /* Window handling functions */
222 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
223 phys_addr_t paddr, u64 size, int prot);
224 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
225
226 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
227 bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
228
229 unsigned long pgsize_bitmap;
230};
231
232/**
233 * struct iommu_device - IOMMU core representation of one IOMMU hardware
234 * instance
235 * @list: Used by the iommu-core to keep a list of registered iommus
236 * @ops: iommu-ops for talking to this iommu
237 * @dev: struct device for sysfs handling
238 */
239struct iommu_device {
240 struct list_head list;
241 const struct iommu_ops *ops;
242 struct fwnode_handle *fwnode;
243 struct device *dev;
244};
245
246int iommu_device_register(struct iommu_device *iommu);
247void iommu_device_unregister(struct iommu_device *iommu);
248int iommu_device_sysfs_add(struct iommu_device *iommu,
249 struct device *parent,
250 const struct attribute_group **groups,
251 const char *fmt, ...) __printf(4, 5);
252void iommu_device_sysfs_remove(struct iommu_device *iommu);
253int iommu_device_link(struct iommu_device *iommu, struct device *link);
254void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
255
256static inline void iommu_device_set_ops(struct iommu_device *iommu,
257 const struct iommu_ops *ops)
258{
259 iommu->ops = ops;
260}
261
262static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
263 struct fwnode_handle *fwnode)
264{
265 iommu->fwnode = fwnode;
266}
267
268static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
269{
270 return (struct iommu_device *)dev_get_drvdata(dev);
271}
272
273#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
274#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
275#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
276#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
277#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
278#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
279
280extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
281extern bool iommu_present(struct bus_type *bus);
282extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
283extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
284extern struct iommu_group *iommu_group_get_by_id(int id);
285extern void iommu_domain_free(struct iommu_domain *domain);
286extern int iommu_attach_device(struct iommu_domain *domain,
287 struct device *dev);
288extern void iommu_detach_device(struct iommu_domain *domain,
289 struct device *dev);
290extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
291extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
292extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
293 phys_addr_t paddr, size_t size, int prot);
294extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
295 size_t size);
296extern size_t iommu_unmap_fast(struct iommu_domain *domain,
297 unsigned long iova, size_t size);
298extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
299 struct scatterlist *sg,unsigned int nents, int prot);
300extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
301extern void iommu_set_fault_handler(struct iommu_domain *domain,
302 iommu_fault_handler_t handler, void *token);
303
304extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
305extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
306extern int iommu_request_dm_for_dev(struct device *dev);
307extern struct iommu_resv_region *
308iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
309 enum iommu_resv_type type);
310extern int iommu_get_group_resv_regions(struct iommu_group *group,
311 struct list_head *head);
312
313extern int iommu_attach_group(struct iommu_domain *domain,
314 struct iommu_group *group);
315extern void iommu_detach_group(struct iommu_domain *domain,
316 struct iommu_group *group);
317extern struct iommu_group *iommu_group_alloc(void);
318extern void *iommu_group_get_iommudata(struct iommu_group *group);
319extern void iommu_group_set_iommudata(struct iommu_group *group,
320 void *iommu_data,
321 void (*release)(void *iommu_data));
322extern int iommu_group_set_name(struct iommu_group *group, const char *name);
323extern int iommu_group_add_device(struct iommu_group *group,
324 struct device *dev);
325extern void iommu_group_remove_device(struct device *dev);
326extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
327 int (*fn)(struct device *, void *));
328extern struct iommu_group *iommu_group_get(struct device *dev);
329extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
330extern void iommu_group_put(struct iommu_group *group);
331extern int iommu_group_register_notifier(struct iommu_group *group,
332 struct notifier_block *nb);
333extern int iommu_group_unregister_notifier(struct iommu_group *group,
334 struct notifier_block *nb);
335extern int iommu_group_id(struct iommu_group *group);
336extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
337extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
338
339extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
340 void *data);
341extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
342 void *data);
343
344/* Window handling function prototypes */
345extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
346 phys_addr_t offset, u64 size,
347 int prot);
348extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
349
350extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
351 unsigned long iova, int flags);
352
353static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
354{
355 if (domain->ops->flush_iotlb_all)
356 domain->ops->flush_iotlb_all(domain);
357}
358
359static inline void iommu_tlb_range_add(struct iommu_domain *domain,
360 unsigned long iova, size_t size)
361{
362 if (domain->ops->iotlb_range_add)
363 domain->ops->iotlb_range_add(domain, iova, size);
364}
365
366static inline void iommu_tlb_sync(struct iommu_domain *domain)
367{
368 if (domain->ops->iotlb_sync)
369 domain->ops->iotlb_sync(domain);
370}
371
372/* PCI device grouping function */
373extern struct iommu_group *pci_device_group(struct device *dev);
374/* Generic device grouping function */
375extern struct iommu_group *generic_device_group(struct device *dev);
376/* FSL-MC device grouping function */
377struct iommu_group *fsl_mc_device_group(struct device *dev);
378
379/**
380 * struct iommu_fwspec - per-device IOMMU instance data
381 * @ops: ops for this device's IOMMU
382 * @iommu_fwnode: firmware handle for this device's IOMMU
383 * @iommu_priv: IOMMU driver private data for this device
384 * @num_ids: number of associated device IDs
385 * @ids: IDs which this device may present to the IOMMU
386 */
387struct iommu_fwspec {
388 const struct iommu_ops *ops;
389 struct fwnode_handle *iommu_fwnode;
390 void *iommu_priv;
391 unsigned int num_ids;
392 u32 ids[1];
393};
394
395int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
396 const struct iommu_ops *ops);
397void iommu_fwspec_free(struct device *dev);
398int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
399const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
400
401#else /* CONFIG_IOMMU_API */
402
403struct iommu_ops {};
404struct iommu_group {};
405struct iommu_fwspec {};
406struct iommu_device {};
407
408static inline bool iommu_present(struct bus_type *bus)
409{
410 return false;
411}
412
413static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
414{
415 return false;
416}
417
418static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
419{
420 return NULL;
421}
422
423static inline struct iommu_group *iommu_group_get_by_id(int id)
424{
425 return NULL;
426}
427
428static inline void iommu_domain_free(struct iommu_domain *domain)
429{
430}
431
432static inline int iommu_attach_device(struct iommu_domain *domain,
433 struct device *dev)
434{
435 return -ENODEV;
436}
437
438static inline void iommu_detach_device(struct iommu_domain *domain,
439 struct device *dev)
440{
441}
442
443static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
444{
445 return NULL;
446}
447
448static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
449 phys_addr_t paddr, size_t size, int prot)
450{
451 return -ENODEV;
452}
453
454static inline size_t iommu_unmap(struct iommu_domain *domain,
455 unsigned long iova, size_t size)
456{
457 return 0;
458}
459
460static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
461 unsigned long iova, int gfp_order)
462{
463 return 0;
464}
465
466static inline size_t iommu_map_sg(struct iommu_domain *domain,
467 unsigned long iova, struct scatterlist *sg,
468 unsigned int nents, int prot)
469{
470 return 0;
471}
472
473static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
474{
475}
476
477static inline void iommu_tlb_range_add(struct iommu_domain *domain,
478 unsigned long iova, size_t size)
479{
480}
481
482static inline void iommu_tlb_sync(struct iommu_domain *domain)
483{
484}
485
486static inline int iommu_domain_window_enable(struct iommu_domain *domain,
487 u32 wnd_nr, phys_addr_t paddr,
488 u64 size, int prot)
489{
490 return -ENODEV;
491}
492
493static inline void iommu_domain_window_disable(struct iommu_domain *domain,
494 u32 wnd_nr)
495{
496}
497
498static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
499{
500 return 0;
501}
502
503static inline void iommu_set_fault_handler(struct iommu_domain *domain,
504 iommu_fault_handler_t handler, void *token)
505{
506}
507
508static inline void iommu_get_resv_regions(struct device *dev,
509 struct list_head *list)
510{
511}
512
513static inline void iommu_put_resv_regions(struct device *dev,
514 struct list_head *list)
515{
516}
517
518static inline int iommu_get_group_resv_regions(struct iommu_group *group,
519 struct list_head *head)
520{
521 return -ENODEV;
522}
523
524static inline int iommu_request_dm_for_dev(struct device *dev)
525{
526 return -ENODEV;
527}
528
529static inline int iommu_attach_group(struct iommu_domain *domain,
530 struct iommu_group *group)
531{
532 return -ENODEV;
533}
534
535static inline void iommu_detach_group(struct iommu_domain *domain,
536 struct iommu_group *group)
537{
538}
539
540static inline struct iommu_group *iommu_group_alloc(void)
541{
542 return ERR_PTR(-ENODEV);
543}
544
545static inline void *iommu_group_get_iommudata(struct iommu_group *group)
546{
547 return NULL;
548}
549
550static inline void iommu_group_set_iommudata(struct iommu_group *group,
551 void *iommu_data,
552 void (*release)(void *iommu_data))
553{
554}
555
556static inline int iommu_group_set_name(struct iommu_group *group,
557 const char *name)
558{
559 return -ENODEV;
560}
561
562static inline int iommu_group_add_device(struct iommu_group *group,
563 struct device *dev)
564{
565 return -ENODEV;
566}
567
568static inline void iommu_group_remove_device(struct device *dev)
569{
570}
571
572static inline int iommu_group_for_each_dev(struct iommu_group *group,
573 void *data,
574 int (*fn)(struct device *, void *))
575{
576 return -ENODEV;
577}
578
579static inline struct iommu_group *iommu_group_get(struct device *dev)
580{
581 return NULL;
582}
583
584static inline void iommu_group_put(struct iommu_group *group)
585{
586}
587
588static inline int iommu_group_register_notifier(struct iommu_group *group,
589 struct notifier_block *nb)
590{
591 return -ENODEV;
592}
593
594static inline int iommu_group_unregister_notifier(struct iommu_group *group,
595 struct notifier_block *nb)
596{
597 return 0;
598}
599
600static inline int iommu_group_id(struct iommu_group *group)
601{
602 return -ENODEV;
603}
604
605static inline int iommu_domain_get_attr(struct iommu_domain *domain,
606 enum iommu_attr attr, void *data)
607{
608 return -EINVAL;
609}
610
611static inline int iommu_domain_set_attr(struct iommu_domain *domain,
612 enum iommu_attr attr, void *data)
613{
614 return -EINVAL;
615}
616
617static inline int iommu_device_register(struct iommu_device *iommu)
618{
619 return -ENODEV;
620}
621
622static inline void iommu_device_set_ops(struct iommu_device *iommu,
623 const struct iommu_ops *ops)
624{
625}
626
627static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
628 struct fwnode_handle *fwnode)
629{
630}
631
632static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
633{
634 return NULL;
635}
636
637static inline void iommu_device_unregister(struct iommu_device *iommu)
638{
639}
640
641static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
642 struct device *parent,
643 const struct attribute_group **groups,
644 const char *fmt, ...)
645{
646 return -ENODEV;
647}
648
649static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
650{
651}
652
653static inline int iommu_device_link(struct device *dev, struct device *link)
654{
655 return -EINVAL;
656}
657
658static inline void iommu_device_unlink(struct device *dev, struct device *link)
659{
660}
661
662static inline int iommu_fwspec_init(struct device *dev,
663 struct fwnode_handle *iommu_fwnode,
664 const struct iommu_ops *ops)
665{
666 return -ENODEV;
667}
668
669static inline void iommu_fwspec_free(struct device *dev)
670{
671}
672
673static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
674 int num_ids)
675{
676 return -ENODEV;
677}
678
679static inline
680const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
681{
682 return NULL;
683}
684
685#endif /* CONFIG_IOMMU_API */
686
687#ifdef CONFIG_IOMMU_DEBUGFS
688extern struct dentry *iommu_debugfs_dir;
689void iommu_debugfs_setup(void);
690#else
691static inline void iommu_debugfs_setup(void) {}
692#endif
693
694#endif /* __LINUX_IOMMU_H */