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