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_iotlb_all: Synchronously flush all hardware TLBs for this domain
171 * @iotlb_range_add: Add a given iova range to the flush queue for this domain
172 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
173 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
174 * queue
175 * @iova_to_phys: translate iova to physical address
176 * @add_device: add device to iommu grouping
177 * @remove_device: remove device from iommu grouping
178 * @device_group: find iommu group for a particular device
179 * @domain_get_attr: Query domain attributes
180 * @domain_set_attr: Change domain attributes
181 * @get_resv_regions: Request list of reserved regions for a device
182 * @put_resv_regions: Free list of reserved regions for a device
183 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
184 * @domain_window_enable: Configure and enable a particular window for a domain
185 * @domain_window_disable: Disable a particular window for a domain
186 * @of_xlate: add OF master IDs to iommu grouping
187 * @is_attach_deferred: Check if domain attach should be deferred from iommu
188 * driver init to device driver init (default no)
189 * @pgsize_bitmap: bitmap of all possible supported page sizes
190 */
191struct iommu_ops {
192 bool (*capable)(enum iommu_cap);
193
194 /* Domain allocation and freeing by the iommu driver */
195 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
196 void (*domain_free)(struct iommu_domain *);
197
198 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
199 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
200 int (*map)(struct iommu_domain *domain, unsigned long iova,
201 phys_addr_t paddr, size_t size, int prot);
202 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
203 size_t size);
204 void (*flush_iotlb_all)(struct iommu_domain *domain);
205 void (*iotlb_range_add)(struct iommu_domain *domain,
206 unsigned long iova, size_t size);
207 void (*iotlb_sync_map)(struct iommu_domain *domain);
208 void (*iotlb_sync)(struct iommu_domain *domain);
209 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
210 int (*add_device)(struct device *dev);
211 void (*remove_device)(struct device *dev);
212 struct iommu_group *(*device_group)(struct device *dev);
213 int (*domain_get_attr)(struct iommu_domain *domain,
214 enum iommu_attr attr, void *data);
215 int (*domain_set_attr)(struct iommu_domain *domain,
216 enum iommu_attr attr, void *data);
217
218 /* Request/Free a list of reserved regions for a device */
219 void (*get_resv_regions)(struct device *dev, struct list_head *list);
220 void (*put_resv_regions)(struct device *dev, struct list_head *list);
221 void (*apply_resv_region)(struct device *dev,
222 struct iommu_domain *domain,
223 struct iommu_resv_region *region);
224
225 /* Window handling functions */
226 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
227 phys_addr_t paddr, u64 size, int prot);
228 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
229
230 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
231 bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
232
233 unsigned long pgsize_bitmap;
234};
235
236/**
237 * struct iommu_device - IOMMU core representation of one IOMMU hardware
238 * instance
239 * @list: Used by the iommu-core to keep a list of registered iommus
240 * @ops: iommu-ops for talking to this iommu
241 * @dev: struct device for sysfs handling
242 */
243struct iommu_device {
244 struct list_head list;
245 const struct iommu_ops *ops;
246 struct fwnode_handle *fwnode;
247 struct device *dev;
248};
249
250int iommu_device_register(struct iommu_device *iommu);
251void iommu_device_unregister(struct iommu_device *iommu);
252int iommu_device_sysfs_add(struct iommu_device *iommu,
253 struct device *parent,
254 const struct attribute_group **groups,
255 const char *fmt, ...) __printf(4, 5);
256void iommu_device_sysfs_remove(struct iommu_device *iommu);
257int iommu_device_link(struct iommu_device *iommu, struct device *link);
258void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
259
260static inline void iommu_device_set_ops(struct iommu_device *iommu,
261 const struct iommu_ops *ops)
262{
263 iommu->ops = ops;
264}
265
266static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
267 struct fwnode_handle *fwnode)
268{
269 iommu->fwnode = fwnode;
270}
271
272static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
273{
274 return (struct iommu_device *)dev_get_drvdata(dev);
275}
276
277#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
278#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
279#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
280#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
281#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
282#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
283
284extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
285extern bool iommu_present(struct bus_type *bus);
286extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
287extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
288extern struct iommu_group *iommu_group_get_by_id(int id);
289extern void iommu_domain_free(struct iommu_domain *domain);
290extern int iommu_attach_device(struct iommu_domain *domain,
291 struct device *dev);
292extern void iommu_detach_device(struct iommu_domain *domain,
293 struct device *dev);
294extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
295extern struct iommu_domain *iommu_get_dma_domain(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/* FSL-MC device grouping function */
381struct iommu_group *fsl_mc_device_group(struct device *dev);
382
383/**
384 * struct iommu_fwspec - per-device IOMMU instance data
385 * @ops: ops for this device's IOMMU
386 * @iommu_fwnode: firmware handle for this device's IOMMU
387 * @iommu_priv: IOMMU driver private data for this device
388 * @num_ids: number of associated device IDs
389 * @ids: IDs which this device may present to the IOMMU
390 */
391struct iommu_fwspec {
392 const struct iommu_ops *ops;
393 struct fwnode_handle *iommu_fwnode;
394 void *iommu_priv;
395 unsigned int num_ids;
396 u32 ids[1];
397};
398
399int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
400 const struct iommu_ops *ops);
401void iommu_fwspec_free(struct device *dev);
402int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
403const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
404
405static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
406{
407 return dev->iommu_fwspec;
408}
409
410static inline void dev_iommu_fwspec_set(struct device *dev,
411 struct iommu_fwspec *fwspec)
412{
413 dev->iommu_fwspec = fwspec;
414}
415
416int iommu_probe_device(struct device *dev);
417void iommu_release_device(struct device *dev);
418
419#else /* CONFIG_IOMMU_API */
420
421struct iommu_ops {};
422struct iommu_group {};
423struct iommu_fwspec {};
424struct iommu_device {};
425
426static inline bool iommu_present(struct bus_type *bus)
427{
428 return false;
429}
430
431static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
432{
433 return false;
434}
435
436static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
437{
438 return NULL;
439}
440
441static inline struct iommu_group *iommu_group_get_by_id(int id)
442{
443 return NULL;
444}
445
446static inline void iommu_domain_free(struct iommu_domain *domain)
447{
448}
449
450static inline int iommu_attach_device(struct iommu_domain *domain,
451 struct device *dev)
452{
453 return -ENODEV;
454}
455
456static inline void iommu_detach_device(struct iommu_domain *domain,
457 struct device *dev)
458{
459}
460
461static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
462{
463 return NULL;
464}
465
466static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
467 phys_addr_t paddr, size_t size, int prot)
468{
469 return -ENODEV;
470}
471
472static inline size_t iommu_unmap(struct iommu_domain *domain,
473 unsigned long iova, size_t size)
474{
475 return 0;
476}
477
478static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
479 unsigned long iova, int gfp_order)
480{
481 return 0;
482}
483
484static inline size_t iommu_map_sg(struct iommu_domain *domain,
485 unsigned long iova, struct scatterlist *sg,
486 unsigned int nents, int prot)
487{
488 return 0;
489}
490
491static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
492{
493}
494
495static inline void iommu_tlb_range_add(struct iommu_domain *domain,
496 unsigned long iova, size_t size)
497{
498}
499
500static inline void iommu_tlb_sync(struct iommu_domain *domain)
501{
502}
503
504static inline int iommu_domain_window_enable(struct iommu_domain *domain,
505 u32 wnd_nr, phys_addr_t paddr,
506 u64 size, int prot)
507{
508 return -ENODEV;
509}
510
511static inline void iommu_domain_window_disable(struct iommu_domain *domain,
512 u32 wnd_nr)
513{
514}
515
516static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
517{
518 return 0;
519}
520
521static inline void iommu_set_fault_handler(struct iommu_domain *domain,
522 iommu_fault_handler_t handler, void *token)
523{
524}
525
526static inline void iommu_get_resv_regions(struct device *dev,
527 struct list_head *list)
528{
529}
530
531static inline void iommu_put_resv_regions(struct device *dev,
532 struct list_head *list)
533{
534}
535
536static inline int iommu_get_group_resv_regions(struct iommu_group *group,
537 struct list_head *head)
538{
539 return -ENODEV;
540}
541
542static inline int iommu_request_dm_for_dev(struct device *dev)
543{
544 return -ENODEV;
545}
546
547static inline int iommu_attach_group(struct iommu_domain *domain,
548 struct iommu_group *group)
549{
550 return -ENODEV;
551}
552
553static inline void iommu_detach_group(struct iommu_domain *domain,
554 struct iommu_group *group)
555{
556}
557
558static inline struct iommu_group *iommu_group_alloc(void)
559{
560 return ERR_PTR(-ENODEV);
561}
562
563static inline void *iommu_group_get_iommudata(struct iommu_group *group)
564{
565 return NULL;
566}
567
568static inline void iommu_group_set_iommudata(struct iommu_group *group,
569 void *iommu_data,
570 void (*release)(void *iommu_data))
571{
572}
573
574static inline int iommu_group_set_name(struct iommu_group *group,
575 const char *name)
576{
577 return -ENODEV;
578}
579
580static inline int iommu_group_add_device(struct iommu_group *group,
581 struct device *dev)
582{
583 return -ENODEV;
584}
585
586static inline void iommu_group_remove_device(struct device *dev)
587{
588}
589
590static inline int iommu_group_for_each_dev(struct iommu_group *group,
591 void *data,
592 int (*fn)(struct device *, void *))
593{
594 return -ENODEV;
595}
596
597static inline struct iommu_group *iommu_group_get(struct device *dev)
598{
599 return NULL;
600}
601
602static inline void iommu_group_put(struct iommu_group *group)
603{
604}
605
606static inline int iommu_group_register_notifier(struct iommu_group *group,
607 struct notifier_block *nb)
608{
609 return -ENODEV;
610}
611
612static inline int iommu_group_unregister_notifier(struct iommu_group *group,
613 struct notifier_block *nb)
614{
615 return 0;
616}
617
618static inline int iommu_group_id(struct iommu_group *group)
619{
620 return -ENODEV;
621}
622
623static inline int iommu_domain_get_attr(struct iommu_domain *domain,
624 enum iommu_attr attr, void *data)
625{
626 return -EINVAL;
627}
628
629static inline int iommu_domain_set_attr(struct iommu_domain *domain,
630 enum iommu_attr attr, void *data)
631{
632 return -EINVAL;
633}
634
635static inline int iommu_device_register(struct iommu_device *iommu)
636{
637 return -ENODEV;
638}
639
640static inline void iommu_device_set_ops(struct iommu_device *iommu,
641 const struct iommu_ops *ops)
642{
643}
644
645static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
646 struct fwnode_handle *fwnode)
647{
648}
649
650static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
651{
652 return NULL;
653}
654
655static inline void iommu_device_unregister(struct iommu_device *iommu)
656{
657}
658
659static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
660 struct device *parent,
661 const struct attribute_group **groups,
662 const char *fmt, ...)
663{
664 return -ENODEV;
665}
666
667static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
668{
669}
670
671static inline int iommu_device_link(struct device *dev, struct device *link)
672{
673 return -EINVAL;
674}
675
676static inline void iommu_device_unlink(struct device *dev, struct device *link)
677{
678}
679
680static inline int iommu_fwspec_init(struct device *dev,
681 struct fwnode_handle *iommu_fwnode,
682 const struct iommu_ops *ops)
683{
684 return -ENODEV;
685}
686
687static inline void iommu_fwspec_free(struct device *dev)
688{
689}
690
691static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
692 int num_ids)
693{
694 return -ENODEV;
695}
696
697static inline
698const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
699{
700 return NULL;
701}
702
703#endif /* CONFIG_IOMMU_API */
704
705#ifdef CONFIG_IOMMU_DEBUGFS
706extern struct dentry *iommu_debugfs_dir;
707void iommu_debugfs_setup(void);
708#else
709static inline void iommu_debugfs_setup(void) {}
710#endif
711
712#endif /* __LINUX_IOMMU_H */
713