Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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_MAX,
128};
129
130/* These are the possible reserved region types */
131enum iommu_resv_type {
132 /* Memory regions which must be mapped 1:1 at all times */
133 IOMMU_RESV_DIRECT,
134 /* Arbitrary "never map this or give it to a device" address ranges */
135 IOMMU_RESV_RESERVED,
136 /* Hardware MSI region (untranslated) */
137 IOMMU_RESV_MSI,
138 /* Software-managed MSI translation window */
139 IOMMU_RESV_SW_MSI,
140};
141
142/**
143 * struct iommu_resv_region - descriptor for a reserved memory region
144 * @list: Linked list pointers
145 * @start: System physical start address of the region
146 * @length: Length of the region in bytes
147 * @prot: IOMMU Protection flags (READ/WRITE/...)
148 * @type: Type of the reserved region
149 */
150struct iommu_resv_region {
151 struct list_head list;
152 phys_addr_t start;
153 size_t length;
154 int prot;
155 enum iommu_resv_type type;
156};
157
158#ifdef CONFIG_IOMMU_API
159
160/**
161 * struct iommu_ops - iommu ops and capabilities
162 * @capable: check capability
163 * @domain_alloc: allocate iommu domain
164 * @domain_free: free iommu domain
165 * @attach_dev: attach device to an iommu domain
166 * @detach_dev: detach device from an iommu domain
167 * @map: map a physically contiguous memory region to an iommu domain
168 * @unmap: unmap a physically contiguous memory region from an iommu domain
169 * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain
170 * @tlb_range_add: Add a given iova range to the flush queue for this domain
171 * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
172 * queue
173 * @iova_to_phys: translate iova to physical address
174 * @add_device: add device to iommu grouping
175 * @remove_device: remove device from iommu grouping
176 * @device_group: find iommu group for a particular device
177 * @domain_get_attr: Query domain attributes
178 * @domain_set_attr: Change domain attributes
179 * @get_resv_regions: Request list of reserved regions for a device
180 * @put_resv_regions: Free list of reserved regions for a device
181 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
182 * @domain_window_enable: Configure and enable a particular window for a domain
183 * @domain_window_disable: Disable a particular window for a domain
184 * @domain_set_windows: Set the number of windows for a domain
185 * @domain_get_windows: Return the number of windows for a domain
186 * @of_xlate: add OF master IDs to iommu grouping
187 * @pgsize_bitmap: bitmap of all possible supported page sizes
188 */
189struct iommu_ops {
190 bool (*capable)(enum iommu_cap);
191
192 /* Domain allocation and freeing by the iommu driver */
193 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
194 void (*domain_free)(struct iommu_domain *);
195
196 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
197 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
198 int (*map)(struct iommu_domain *domain, unsigned long iova,
199 phys_addr_t paddr, size_t size, int prot);
200 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
201 size_t size);
202 void (*flush_iotlb_all)(struct iommu_domain *domain);
203 void (*iotlb_range_add)(struct iommu_domain *domain,
204 unsigned long iova, size_t size);
205 void (*iotlb_sync)(struct iommu_domain *domain);
206 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
207 int (*add_device)(struct device *dev);
208 void (*remove_device)(struct device *dev);
209 struct iommu_group *(*device_group)(struct device *dev);
210 int (*domain_get_attr)(struct iommu_domain *domain,
211 enum iommu_attr attr, void *data);
212 int (*domain_set_attr)(struct iommu_domain *domain,
213 enum iommu_attr attr, void *data);
214
215 /* Request/Free a list of reserved regions for a device */
216 void (*get_resv_regions)(struct device *dev, struct list_head *list);
217 void (*put_resv_regions)(struct device *dev, struct list_head *list);
218 void (*apply_resv_region)(struct device *dev,
219 struct iommu_domain *domain,
220 struct iommu_resv_region *region);
221
222 /* Window handling functions */
223 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
224 phys_addr_t paddr, u64 size, int prot);
225 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
226 /* Set the number of windows per domain */
227 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
228 /* Get the number of windows per domain */
229 u32 (*domain_get_windows)(struct iommu_domain *domain);
230
231 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
232 bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
233
234 unsigned long pgsize_bitmap;
235};
236
237/**
238 * struct iommu_device - IOMMU core representation of one IOMMU hardware
239 * instance
240 * @list: Used by the iommu-core to keep a list of registered iommus
241 * @ops: iommu-ops for talking to this iommu
242 * @dev: struct device for sysfs handling
243 */
244struct iommu_device {
245 struct list_head list;
246 const struct iommu_ops *ops;
247 struct fwnode_handle *fwnode;
248 struct device *dev;
249};
250
251int iommu_device_register(struct iommu_device *iommu);
252void iommu_device_unregister(struct iommu_device *iommu);
253int iommu_device_sysfs_add(struct iommu_device *iommu,
254 struct device *parent,
255 const struct attribute_group **groups,
256 const char *fmt, ...) __printf(4, 5);
257void iommu_device_sysfs_remove(struct iommu_device *iommu);
258int iommu_device_link(struct iommu_device *iommu, struct device *link);
259void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
260
261static inline void iommu_device_set_ops(struct iommu_device *iommu,
262 const struct iommu_ops *ops)
263{
264 iommu->ops = ops;
265}
266
267static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
268 struct fwnode_handle *fwnode)
269{
270 iommu->fwnode = fwnode;
271}
272
273static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
274{
275 return (struct iommu_device *)dev_get_drvdata(dev);
276}
277
278#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
279#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
280#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
281#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
282#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
283#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
284
285extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
286extern bool iommu_present(struct bus_type *bus);
287extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
288extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
289extern struct iommu_group *iommu_group_get_by_id(int id);
290extern void iommu_domain_free(struct iommu_domain *domain);
291extern int iommu_attach_device(struct iommu_domain *domain,
292 struct device *dev);
293extern void iommu_detach_device(struct iommu_domain *domain,
294 struct device *dev);
295extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
296extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
297 phys_addr_t paddr, size_t size, int prot);
298extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
299 size_t size);
300extern size_t iommu_unmap_fast(struct iommu_domain *domain,
301 unsigned long iova, size_t size);
302extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
303 struct scatterlist *sg,unsigned int nents, int prot);
304extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
305extern void iommu_set_fault_handler(struct iommu_domain *domain,
306 iommu_fault_handler_t handler, void *token);
307
308extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
309extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
310extern int iommu_request_dm_for_dev(struct device *dev);
311extern struct iommu_resv_region *
312iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
313 enum iommu_resv_type type);
314extern int iommu_get_group_resv_regions(struct iommu_group *group,
315 struct list_head *head);
316
317extern int iommu_attach_group(struct iommu_domain *domain,
318 struct iommu_group *group);
319extern void iommu_detach_group(struct iommu_domain *domain,
320 struct iommu_group *group);
321extern struct iommu_group *iommu_group_alloc(void);
322extern void *iommu_group_get_iommudata(struct iommu_group *group);
323extern void iommu_group_set_iommudata(struct iommu_group *group,
324 void *iommu_data,
325 void (*release)(void *iommu_data));
326extern int iommu_group_set_name(struct iommu_group *group, const char *name);
327extern int iommu_group_add_device(struct iommu_group *group,
328 struct device *dev);
329extern void iommu_group_remove_device(struct device *dev);
330extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
331 int (*fn)(struct device *, void *));
332extern struct iommu_group *iommu_group_get(struct device *dev);
333extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
334extern void iommu_group_put(struct iommu_group *group);
335extern int iommu_group_register_notifier(struct iommu_group *group,
336 struct notifier_block *nb);
337extern int iommu_group_unregister_notifier(struct iommu_group *group,
338 struct notifier_block *nb);
339extern int iommu_group_id(struct iommu_group *group);
340extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
341extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
342
343extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
344 void *data);
345extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
346 void *data);
347
348/* Window handling function prototypes */
349extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
350 phys_addr_t offset, u64 size,
351 int prot);
352extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
353
354extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
355 unsigned long iova, int flags);
356
357static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
358{
359 if (domain->ops->flush_iotlb_all)
360 domain->ops->flush_iotlb_all(domain);
361}
362
363static inline void iommu_tlb_range_add(struct iommu_domain *domain,
364 unsigned long iova, size_t size)
365{
366 if (domain->ops->iotlb_range_add)
367 domain->ops->iotlb_range_add(domain, iova, size);
368}
369
370static inline void iommu_tlb_sync(struct iommu_domain *domain)
371{
372 if (domain->ops->iotlb_sync)
373 domain->ops->iotlb_sync(domain);
374}
375
376/* PCI device grouping function */
377extern struct iommu_group *pci_device_group(struct device *dev);
378/* Generic device grouping function */
379extern struct iommu_group *generic_device_group(struct device *dev);
380
381/**
382 * struct iommu_fwspec - per-device IOMMU instance data
383 * @ops: ops for this device's IOMMU
384 * @iommu_fwnode: firmware handle for this device's IOMMU
385 * @iommu_priv: IOMMU driver private data for this device
386 * @num_ids: number of associated device IDs
387 * @ids: IDs which this device may present to the IOMMU
388 */
389struct iommu_fwspec {
390 const struct iommu_ops *ops;
391 struct fwnode_handle *iommu_fwnode;
392 void *iommu_priv;
393 unsigned int num_ids;
394 u32 ids[1];
395};
396
397int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
398 const struct iommu_ops *ops);
399void iommu_fwspec_free(struct device *dev);
400int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
401const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
402
403#else /* CONFIG_IOMMU_API */
404
405struct iommu_ops {};
406struct iommu_group {};
407struct iommu_fwspec {};
408struct iommu_device {};
409
410static inline bool iommu_present(struct bus_type *bus)
411{
412 return false;
413}
414
415static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
416{
417 return false;
418}
419
420static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
421{
422 return NULL;
423}
424
425static inline struct iommu_group *iommu_group_get_by_id(int id)
426{
427 return NULL;
428}
429
430static inline void iommu_domain_free(struct iommu_domain *domain)
431{
432}
433
434static inline int iommu_attach_device(struct iommu_domain *domain,
435 struct device *dev)
436{
437 return -ENODEV;
438}
439
440static inline void iommu_detach_device(struct iommu_domain *domain,
441 struct device *dev)
442{
443}
444
445static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
446{
447 return NULL;
448}
449
450static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
451 phys_addr_t paddr, size_t size, int prot)
452{
453 return -ENODEV;
454}
455
456static inline size_t iommu_unmap(struct iommu_domain *domain,
457 unsigned long iova, size_t size)
458{
459 return 0;
460}
461
462static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
463 unsigned long iova, int gfp_order)
464{
465 return 0;
466}
467
468static inline size_t iommu_map_sg(struct iommu_domain *domain,
469 unsigned long iova, struct scatterlist *sg,
470 unsigned int nents, int prot)
471{
472 return 0;
473}
474
475static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
476{
477}
478
479static inline void iommu_tlb_range_add(struct iommu_domain *domain,
480 unsigned long iova, size_t size)
481{
482}
483
484static inline void iommu_tlb_sync(struct iommu_domain *domain)
485{
486}
487
488static inline int iommu_domain_window_enable(struct iommu_domain *domain,
489 u32 wnd_nr, phys_addr_t paddr,
490 u64 size, int prot)
491{
492 return -ENODEV;
493}
494
495static inline void iommu_domain_window_disable(struct iommu_domain *domain,
496 u32 wnd_nr)
497{
498}
499
500static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
501{
502 return 0;
503}
504
505static inline void iommu_set_fault_handler(struct iommu_domain *domain,
506 iommu_fault_handler_t handler, void *token)
507{
508}
509
510static inline void iommu_get_resv_regions(struct device *dev,
511 struct list_head *list)
512{
513}
514
515static inline void iommu_put_resv_regions(struct device *dev,
516 struct list_head *list)
517{
518}
519
520static inline int iommu_get_group_resv_regions(struct iommu_group *group,
521 struct list_head *head)
522{
523 return -ENODEV;
524}
525
526static inline int iommu_request_dm_for_dev(struct device *dev)
527{
528 return -ENODEV;
529}
530
531static inline int iommu_attach_group(struct iommu_domain *domain,
532 struct iommu_group *group)
533{
534 return -ENODEV;
535}
536
537static inline void iommu_detach_group(struct iommu_domain *domain,
538 struct iommu_group *group)
539{
540}
541
542static inline struct iommu_group *iommu_group_alloc(void)
543{
544 return ERR_PTR(-ENODEV);
545}
546
547static inline void *iommu_group_get_iommudata(struct iommu_group *group)
548{
549 return NULL;
550}
551
552static inline void iommu_group_set_iommudata(struct iommu_group *group,
553 void *iommu_data,
554 void (*release)(void *iommu_data))
555{
556}
557
558static inline int iommu_group_set_name(struct iommu_group *group,
559 const char *name)
560{
561 return -ENODEV;
562}
563
564static inline int iommu_group_add_device(struct iommu_group *group,
565 struct device *dev)
566{
567 return -ENODEV;
568}
569
570static inline void iommu_group_remove_device(struct device *dev)
571{
572}
573
574static inline int iommu_group_for_each_dev(struct iommu_group *group,
575 void *data,
576 int (*fn)(struct device *, void *))
577{
578 return -ENODEV;
579}
580
581static inline struct iommu_group *iommu_group_get(struct device *dev)
582{
583 return NULL;
584}
585
586static inline void iommu_group_put(struct iommu_group *group)
587{
588}
589
590static inline int iommu_group_register_notifier(struct iommu_group *group,
591 struct notifier_block *nb)
592{
593 return -ENODEV;
594}
595
596static inline int iommu_group_unregister_notifier(struct iommu_group *group,
597 struct notifier_block *nb)
598{
599 return 0;
600}
601
602static inline int iommu_group_id(struct iommu_group *group)
603{
604 return -ENODEV;
605}
606
607static inline int iommu_domain_get_attr(struct iommu_domain *domain,
608 enum iommu_attr attr, void *data)
609{
610 return -EINVAL;
611}
612
613static inline int iommu_domain_set_attr(struct iommu_domain *domain,
614 enum iommu_attr attr, void *data)
615{
616 return -EINVAL;
617}
618
619static inline int iommu_device_register(struct iommu_device *iommu)
620{
621 return -ENODEV;
622}
623
624static inline void iommu_device_set_ops(struct iommu_device *iommu,
625 const struct iommu_ops *ops)
626{
627}
628
629static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
630 struct fwnode_handle *fwnode)
631{
632}
633
634static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
635{
636 return NULL;
637}
638
639static inline void iommu_device_unregister(struct iommu_device *iommu)
640{
641}
642
643static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
644 struct device *parent,
645 const struct attribute_group **groups,
646 const char *fmt, ...)
647{
648 return -ENODEV;
649}
650
651static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
652{
653}
654
655static inline int iommu_device_link(struct device *dev, struct device *link)
656{
657 return -EINVAL;
658}
659
660static inline void iommu_device_unlink(struct device *dev, struct device *link)
661{
662}
663
664static inline int iommu_fwspec_init(struct device *dev,
665 struct fwnode_handle *iommu_fwnode,
666 const struct iommu_ops *ops)
667{
668 return -ENODEV;
669}
670
671static inline void iommu_fwspec_free(struct device *dev)
672{
673}
674
675static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
676 int num_ids)
677{
678 return -ENODEV;
679}
680
681static inline
682const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
683{
684 return NULL;
685}
686
687#endif /* CONFIG_IOMMU_API */
688
689#ifdef CONFIG_IOMMU_DEBUGFS
690extern struct dentry *iommu_debugfs_dir;
691void iommu_debugfs_setup(void);
692#else
693static inline void iommu_debugfs_setup(void) {}
694#endif
695
696#endif /* __LINUX_IOMMU_H */