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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <joerg.roedel@amd.com>
5 */
6
7#ifndef __LINUX_IOMMU_H
8#define __LINUX_IOMMU_H
9
10#include <linux/scatterlist.h>
11#include <linux/device.h>
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/err.h>
15#include <linux/of.h>
16#include <uapi/linux/iommu.h>
17
18#define IOMMU_READ (1 << 0)
19#define IOMMU_WRITE (1 << 1)
20#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
21#define IOMMU_NOEXEC (1 << 3)
22#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
23/*
24 * Where the bus hardware includes a privilege level as part of its access type
25 * markings, and certain devices are capable of issuing transactions marked as
26 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
27 * given permission flags only apply to accesses at the higher privilege level,
28 * and that unprivileged transactions should have as little access as possible.
29 * This would usually imply the same permissions as kernel mappings on the CPU,
30 * if the IOMMU page table format is equivalent.
31 */
32#define IOMMU_PRIV (1 << 5)
33/*
34 * Non-coherent masters on few Qualcomm SoCs can use this page protection flag
35 * to set correct cacheability attributes to use an outer level of cache -
36 * last level cache, aka system cache.
37 */
38#define IOMMU_QCOM_SYS_CACHE (1 << 6)
39
40struct iommu_ops;
41struct iommu_group;
42struct bus_type;
43struct device;
44struct iommu_domain;
45struct notifier_block;
46struct iommu_sva;
47struct iommu_fault_event;
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 *);
55typedef int (*iommu_mm_exit_handler_t)(struct device *dev, struct iommu_sva *,
56 void *);
57typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, 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 /*
136 * Memory regions which are advertised to be 1:1 but are
137 * commonly considered relaxable in some conditions,
138 * for instance in device assignment use case (USB, Graphics)
139 */
140 IOMMU_RESV_DIRECT_RELAXABLE,
141 /* Arbitrary "never map this or give it to a device" address ranges */
142 IOMMU_RESV_RESERVED,
143 /* Hardware MSI region (untranslated) */
144 IOMMU_RESV_MSI,
145 /* Software-managed MSI translation window */
146 IOMMU_RESV_SW_MSI,
147};
148
149/**
150 * struct iommu_resv_region - descriptor for a reserved memory region
151 * @list: Linked list pointers
152 * @start: System physical start address of the region
153 * @length: Length of the region in bytes
154 * @prot: IOMMU Protection flags (READ/WRITE/...)
155 * @type: Type of the reserved region
156 */
157struct iommu_resv_region {
158 struct list_head list;
159 phys_addr_t start;
160 size_t length;
161 int prot;
162 enum iommu_resv_type type;
163};
164
165/* Per device IOMMU features */
166enum iommu_dev_features {
167 IOMMU_DEV_FEAT_AUX, /* Aux-domain feature */
168 IOMMU_DEV_FEAT_SVA, /* Shared Virtual Addresses */
169};
170
171#define IOMMU_PASID_INVALID (-1U)
172
173/**
174 * struct iommu_sva_ops - device driver callbacks for an SVA context
175 *
176 * @mm_exit: called when the mm is about to be torn down by exit_mmap. After
177 * @mm_exit returns, the device must not issue any more transaction
178 * with the PASID given as argument.
179 *
180 * The @mm_exit handler is allowed to sleep. Be careful about the
181 * locks taken in @mm_exit, because they might lead to deadlocks if
182 * they are also held when dropping references to the mm. Consider the
183 * following call chain:
184 * mutex_lock(A); mmput(mm) -> exit_mm() -> @mm_exit() -> mutex_lock(A)
185 * Using mmput_async() prevents this scenario.
186 *
187 */
188struct iommu_sva_ops {
189 iommu_mm_exit_handler_t mm_exit;
190};
191
192#ifdef CONFIG_IOMMU_API
193
194/**
195 * struct iommu_ops - iommu ops and capabilities
196 * @capable: check capability
197 * @domain_alloc: allocate iommu domain
198 * @domain_free: free iommu domain
199 * @attach_dev: attach device to an iommu domain
200 * @detach_dev: detach device from an iommu domain
201 * @map: map a physically contiguous memory region to an iommu domain
202 * @unmap: unmap a physically contiguous memory region from an iommu domain
203 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
204 * @iotlb_range_add: Add a given iova range to the flush queue for this domain
205 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
206 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
207 * queue
208 * @iova_to_phys: translate iova to physical address
209 * @add_device: add device to iommu grouping
210 * @remove_device: remove device from iommu grouping
211 * @device_group: find iommu group for a particular device
212 * @domain_get_attr: Query domain attributes
213 * @domain_set_attr: Change domain attributes
214 * @get_resv_regions: Request list of reserved regions for a device
215 * @put_resv_regions: Free list of reserved regions for a device
216 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
217 * @domain_window_enable: Configure and enable a particular window for a domain
218 * @domain_window_disable: Disable a particular window for a domain
219 * @of_xlate: add OF master IDs to iommu grouping
220 * @is_attach_deferred: Check if domain attach should be deferred from iommu
221 * driver init to device driver init (default no)
222 * @dev_has/enable/disable_feat: per device entries to check/enable/disable
223 * iommu specific features.
224 * @dev_feat_enabled: check enabled feature
225 * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
226 * @aux_get_pasid: get the pasid given an aux-domain
227 * @sva_bind: Bind process address space to device
228 * @sva_unbind: Unbind process address space from device
229 * @sva_get_pasid: Get PASID associated to a SVA handle
230 * @page_response: handle page request response
231 * @pgsize_bitmap: bitmap of all possible supported page sizes
232 */
233struct iommu_ops {
234 bool (*capable)(enum iommu_cap);
235
236 /* Domain allocation and freeing by the iommu driver */
237 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
238 void (*domain_free)(struct iommu_domain *);
239
240 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
241 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
242 int (*map)(struct iommu_domain *domain, unsigned long iova,
243 phys_addr_t paddr, size_t size, int prot);
244 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
245 size_t size);
246 void (*flush_iotlb_all)(struct iommu_domain *domain);
247 void (*iotlb_range_add)(struct iommu_domain *domain,
248 unsigned long iova, size_t size);
249 void (*iotlb_sync_map)(struct iommu_domain *domain);
250 void (*iotlb_sync)(struct iommu_domain *domain);
251 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
252 int (*add_device)(struct device *dev);
253 void (*remove_device)(struct device *dev);
254 struct iommu_group *(*device_group)(struct device *dev);
255 int (*domain_get_attr)(struct iommu_domain *domain,
256 enum iommu_attr attr, void *data);
257 int (*domain_set_attr)(struct iommu_domain *domain,
258 enum iommu_attr attr, void *data);
259
260 /* Request/Free a list of reserved regions for a device */
261 void (*get_resv_regions)(struct device *dev, struct list_head *list);
262 void (*put_resv_regions)(struct device *dev, struct list_head *list);
263 void (*apply_resv_region)(struct device *dev,
264 struct iommu_domain *domain,
265 struct iommu_resv_region *region);
266
267 /* Window handling functions */
268 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
269 phys_addr_t paddr, u64 size, int prot);
270 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
271
272 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
273 bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
274
275 /* Per device IOMMU features */
276 bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
277 bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
278 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
279 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
280
281 /* Aux-domain specific attach/detach entries */
282 int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
283 void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
284 int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);
285
286 struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
287 void *drvdata);
288 void (*sva_unbind)(struct iommu_sva *handle);
289 int (*sva_get_pasid)(struct iommu_sva *handle);
290
291 int (*page_response)(struct device *dev,
292 struct iommu_fault_event *evt,
293 struct iommu_page_response *msg);
294
295 unsigned long pgsize_bitmap;
296};
297
298/**
299 * struct iommu_device - IOMMU core representation of one IOMMU hardware
300 * instance
301 * @list: Used by the iommu-core to keep a list of registered iommus
302 * @ops: iommu-ops for talking to this iommu
303 * @dev: struct device for sysfs handling
304 */
305struct iommu_device {
306 struct list_head list;
307 const struct iommu_ops *ops;
308 struct fwnode_handle *fwnode;
309 struct device *dev;
310};
311
312/**
313 * struct iommu_fault_event - Generic fault event
314 *
315 * Can represent recoverable faults such as a page requests or
316 * unrecoverable faults such as DMA or IRQ remapping faults.
317 *
318 * @fault: fault descriptor
319 * @list: pending fault event list, used for tracking responses
320 */
321struct iommu_fault_event {
322 struct iommu_fault fault;
323 struct list_head list;
324};
325
326/**
327 * struct iommu_fault_param - per-device IOMMU fault data
328 * @handler: Callback function to handle IOMMU faults at device level
329 * @data: handler private data
330 * @faults: holds the pending faults which needs response
331 * @lock: protect pending faults list
332 */
333struct iommu_fault_param {
334 iommu_dev_fault_handler_t handler;
335 void *data;
336 struct list_head faults;
337 struct mutex lock;
338};
339
340/**
341 * struct iommu_param - collection of per-device IOMMU data
342 *
343 * @fault_param: IOMMU detected device fault reporting data
344 *
345 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
346 * struct iommu_group *iommu_group;
347 * struct iommu_fwspec *iommu_fwspec;
348 */
349struct iommu_param {
350 struct mutex lock;
351 struct iommu_fault_param *fault_param;
352};
353
354int iommu_device_register(struct iommu_device *iommu);
355void iommu_device_unregister(struct iommu_device *iommu);
356int iommu_device_sysfs_add(struct iommu_device *iommu,
357 struct device *parent,
358 const struct attribute_group **groups,
359 const char *fmt, ...) __printf(4, 5);
360void iommu_device_sysfs_remove(struct iommu_device *iommu);
361int iommu_device_link(struct iommu_device *iommu, struct device *link);
362void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
363
364static inline void iommu_device_set_ops(struct iommu_device *iommu,
365 const struct iommu_ops *ops)
366{
367 iommu->ops = ops;
368}
369
370static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
371 struct fwnode_handle *fwnode)
372{
373 iommu->fwnode = fwnode;
374}
375
376static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
377{
378 return (struct iommu_device *)dev_get_drvdata(dev);
379}
380
381#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
382#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
383#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
384#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
385#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
386#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
387
388extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
389extern bool iommu_present(struct bus_type *bus);
390extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
391extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
392extern struct iommu_group *iommu_group_get_by_id(int id);
393extern void iommu_domain_free(struct iommu_domain *domain);
394extern int iommu_attach_device(struct iommu_domain *domain,
395 struct device *dev);
396extern void iommu_detach_device(struct iommu_domain *domain,
397 struct device *dev);
398extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
399extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
400extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
401 phys_addr_t paddr, size_t size, int prot);
402extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
403 size_t size);
404extern size_t iommu_unmap_fast(struct iommu_domain *domain,
405 unsigned long iova, size_t size);
406extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
407 struct scatterlist *sg,unsigned int nents, int prot);
408extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
409extern void iommu_set_fault_handler(struct iommu_domain *domain,
410 iommu_fault_handler_t handler, void *token);
411
412extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
413extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
414extern int iommu_request_dm_for_dev(struct device *dev);
415extern int iommu_request_dma_domain_for_dev(struct device *dev);
416extern struct iommu_resv_region *
417iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
418 enum iommu_resv_type type);
419extern int iommu_get_group_resv_regions(struct iommu_group *group,
420 struct list_head *head);
421
422extern int iommu_attach_group(struct iommu_domain *domain,
423 struct iommu_group *group);
424extern void iommu_detach_group(struct iommu_domain *domain,
425 struct iommu_group *group);
426extern struct iommu_group *iommu_group_alloc(void);
427extern void *iommu_group_get_iommudata(struct iommu_group *group);
428extern void iommu_group_set_iommudata(struct iommu_group *group,
429 void *iommu_data,
430 void (*release)(void *iommu_data));
431extern int iommu_group_set_name(struct iommu_group *group, const char *name);
432extern int iommu_group_add_device(struct iommu_group *group,
433 struct device *dev);
434extern void iommu_group_remove_device(struct device *dev);
435extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
436 int (*fn)(struct device *, void *));
437extern struct iommu_group *iommu_group_get(struct device *dev);
438extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
439extern void iommu_group_put(struct iommu_group *group);
440extern int iommu_group_register_notifier(struct iommu_group *group,
441 struct notifier_block *nb);
442extern int iommu_group_unregister_notifier(struct iommu_group *group,
443 struct notifier_block *nb);
444extern int iommu_register_device_fault_handler(struct device *dev,
445 iommu_dev_fault_handler_t handler,
446 void *data);
447
448extern int iommu_unregister_device_fault_handler(struct device *dev);
449
450extern int iommu_report_device_fault(struct device *dev,
451 struct iommu_fault_event *evt);
452extern int iommu_page_response(struct device *dev,
453 struct iommu_page_response *msg);
454
455extern int iommu_group_id(struct iommu_group *group);
456extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
457extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
458
459extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
460 void *data);
461extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
462 void *data);
463
464/* Window handling function prototypes */
465extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
466 phys_addr_t offset, u64 size,
467 int prot);
468extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
469
470extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
471 unsigned long iova, int flags);
472
473static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
474{
475 if (domain->ops->flush_iotlb_all)
476 domain->ops->flush_iotlb_all(domain);
477}
478
479static inline void iommu_tlb_range_add(struct iommu_domain *domain,
480 unsigned long iova, size_t size)
481{
482 if (domain->ops->iotlb_range_add)
483 domain->ops->iotlb_range_add(domain, iova, size);
484}
485
486static inline void iommu_tlb_sync(struct iommu_domain *domain)
487{
488 if (domain->ops->iotlb_sync)
489 domain->ops->iotlb_sync(domain);
490}
491
492/* PCI device grouping function */
493extern struct iommu_group *pci_device_group(struct device *dev);
494/* Generic device grouping function */
495extern struct iommu_group *generic_device_group(struct device *dev);
496/* FSL-MC device grouping function */
497struct iommu_group *fsl_mc_device_group(struct device *dev);
498
499/**
500 * struct iommu_fwspec - per-device IOMMU instance data
501 * @ops: ops for this device's IOMMU
502 * @iommu_fwnode: firmware handle for this device's IOMMU
503 * @iommu_priv: IOMMU driver private data for this device
504 * @num_ids: number of associated device IDs
505 * @ids: IDs which this device may present to the IOMMU
506 */
507struct iommu_fwspec {
508 const struct iommu_ops *ops;
509 struct fwnode_handle *iommu_fwnode;
510 void *iommu_priv;
511 u32 flags;
512 unsigned int num_ids;
513 u32 ids[1];
514};
515
516/* ATS is supported */
517#define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
518
519/**
520 * struct iommu_sva - handle to a device-mm bond
521 */
522struct iommu_sva {
523 struct device *dev;
524 const struct iommu_sva_ops *ops;
525};
526
527int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
528 const struct iommu_ops *ops);
529void iommu_fwspec_free(struct device *dev);
530int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
531const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
532
533static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
534{
535 return dev->iommu_fwspec;
536}
537
538static inline void dev_iommu_fwspec_set(struct device *dev,
539 struct iommu_fwspec *fwspec)
540{
541 dev->iommu_fwspec = fwspec;
542}
543
544int iommu_probe_device(struct device *dev);
545void iommu_release_device(struct device *dev);
546
547bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
548int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
549int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
550bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
551int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
552void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
553int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);
554
555struct iommu_sva *iommu_sva_bind_device(struct device *dev,
556 struct mm_struct *mm,
557 void *drvdata);
558void iommu_sva_unbind_device(struct iommu_sva *handle);
559int iommu_sva_set_ops(struct iommu_sva *handle,
560 const struct iommu_sva_ops *ops);
561int iommu_sva_get_pasid(struct iommu_sva *handle);
562
563#else /* CONFIG_IOMMU_API */
564
565struct iommu_ops {};
566struct iommu_group {};
567struct iommu_fwspec {};
568struct iommu_device {};
569struct iommu_fault_param {};
570
571static inline bool iommu_present(struct bus_type *bus)
572{
573 return false;
574}
575
576static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
577{
578 return false;
579}
580
581static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
582{
583 return NULL;
584}
585
586static inline struct iommu_group *iommu_group_get_by_id(int id)
587{
588 return NULL;
589}
590
591static inline void iommu_domain_free(struct iommu_domain *domain)
592{
593}
594
595static inline int iommu_attach_device(struct iommu_domain *domain,
596 struct device *dev)
597{
598 return -ENODEV;
599}
600
601static inline void iommu_detach_device(struct iommu_domain *domain,
602 struct device *dev)
603{
604}
605
606static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
607{
608 return NULL;
609}
610
611static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
612 phys_addr_t paddr, size_t size, int prot)
613{
614 return -ENODEV;
615}
616
617static inline size_t iommu_unmap(struct iommu_domain *domain,
618 unsigned long iova, size_t size)
619{
620 return 0;
621}
622
623static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
624 unsigned long iova, int gfp_order)
625{
626 return 0;
627}
628
629static inline size_t iommu_map_sg(struct iommu_domain *domain,
630 unsigned long iova, struct scatterlist *sg,
631 unsigned int nents, int prot)
632{
633 return 0;
634}
635
636static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
637{
638}
639
640static inline void iommu_tlb_range_add(struct iommu_domain *domain,
641 unsigned long iova, size_t size)
642{
643}
644
645static inline void iommu_tlb_sync(struct iommu_domain *domain)
646{
647}
648
649static inline int iommu_domain_window_enable(struct iommu_domain *domain,
650 u32 wnd_nr, phys_addr_t paddr,
651 u64 size, int prot)
652{
653 return -ENODEV;
654}
655
656static inline void iommu_domain_window_disable(struct iommu_domain *domain,
657 u32 wnd_nr)
658{
659}
660
661static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
662{
663 return 0;
664}
665
666static inline void iommu_set_fault_handler(struct iommu_domain *domain,
667 iommu_fault_handler_t handler, void *token)
668{
669}
670
671static inline void iommu_get_resv_regions(struct device *dev,
672 struct list_head *list)
673{
674}
675
676static inline void iommu_put_resv_regions(struct device *dev,
677 struct list_head *list)
678{
679}
680
681static inline int iommu_get_group_resv_regions(struct iommu_group *group,
682 struct list_head *head)
683{
684 return -ENODEV;
685}
686
687static inline int iommu_request_dm_for_dev(struct device *dev)
688{
689 return -ENODEV;
690}
691
692static inline int iommu_request_dma_domain_for_dev(struct device *dev)
693{
694 return -ENODEV;
695}
696
697static inline int iommu_attach_group(struct iommu_domain *domain,
698 struct iommu_group *group)
699{
700 return -ENODEV;
701}
702
703static inline void iommu_detach_group(struct iommu_domain *domain,
704 struct iommu_group *group)
705{
706}
707
708static inline struct iommu_group *iommu_group_alloc(void)
709{
710 return ERR_PTR(-ENODEV);
711}
712
713static inline void *iommu_group_get_iommudata(struct iommu_group *group)
714{
715 return NULL;
716}
717
718static inline void iommu_group_set_iommudata(struct iommu_group *group,
719 void *iommu_data,
720 void (*release)(void *iommu_data))
721{
722}
723
724static inline int iommu_group_set_name(struct iommu_group *group,
725 const char *name)
726{
727 return -ENODEV;
728}
729
730static inline int iommu_group_add_device(struct iommu_group *group,
731 struct device *dev)
732{
733 return -ENODEV;
734}
735
736static inline void iommu_group_remove_device(struct device *dev)
737{
738}
739
740static inline int iommu_group_for_each_dev(struct iommu_group *group,
741 void *data,
742 int (*fn)(struct device *, void *))
743{
744 return -ENODEV;
745}
746
747static inline struct iommu_group *iommu_group_get(struct device *dev)
748{
749 return NULL;
750}
751
752static inline void iommu_group_put(struct iommu_group *group)
753{
754}
755
756static inline int iommu_group_register_notifier(struct iommu_group *group,
757 struct notifier_block *nb)
758{
759 return -ENODEV;
760}
761
762static inline int iommu_group_unregister_notifier(struct iommu_group *group,
763 struct notifier_block *nb)
764{
765 return 0;
766}
767
768static inline
769int iommu_register_device_fault_handler(struct device *dev,
770 iommu_dev_fault_handler_t handler,
771 void *data)
772{
773 return -ENODEV;
774}
775
776static inline int iommu_unregister_device_fault_handler(struct device *dev)
777{
778 return 0;
779}
780
781static inline
782int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
783{
784 return -ENODEV;
785}
786
787static inline int iommu_page_response(struct device *dev,
788 struct iommu_page_response *msg)
789{
790 return -ENODEV;
791}
792
793static inline int iommu_group_id(struct iommu_group *group)
794{
795 return -ENODEV;
796}
797
798static inline int iommu_domain_get_attr(struct iommu_domain *domain,
799 enum iommu_attr attr, void *data)
800{
801 return -EINVAL;
802}
803
804static inline int iommu_domain_set_attr(struct iommu_domain *domain,
805 enum iommu_attr attr, void *data)
806{
807 return -EINVAL;
808}
809
810static inline int iommu_device_register(struct iommu_device *iommu)
811{
812 return -ENODEV;
813}
814
815static inline void iommu_device_set_ops(struct iommu_device *iommu,
816 const struct iommu_ops *ops)
817{
818}
819
820static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
821 struct fwnode_handle *fwnode)
822{
823}
824
825static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
826{
827 return NULL;
828}
829
830static inline void iommu_device_unregister(struct iommu_device *iommu)
831{
832}
833
834static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
835 struct device *parent,
836 const struct attribute_group **groups,
837 const char *fmt, ...)
838{
839 return -ENODEV;
840}
841
842static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
843{
844}
845
846static inline int iommu_device_link(struct device *dev, struct device *link)
847{
848 return -EINVAL;
849}
850
851static inline void iommu_device_unlink(struct device *dev, struct device *link)
852{
853}
854
855static inline int iommu_fwspec_init(struct device *dev,
856 struct fwnode_handle *iommu_fwnode,
857 const struct iommu_ops *ops)
858{
859 return -ENODEV;
860}
861
862static inline void iommu_fwspec_free(struct device *dev)
863{
864}
865
866static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
867 int num_ids)
868{
869 return -ENODEV;
870}
871
872static inline
873const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
874{
875 return NULL;
876}
877
878static inline bool
879iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
880{
881 return false;
882}
883
884static inline bool
885iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
886{
887 return false;
888}
889
890static inline int
891iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
892{
893 return -ENODEV;
894}
895
896static inline int
897iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
898{
899 return -ENODEV;
900}
901
902static inline int
903iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
904{
905 return -ENODEV;
906}
907
908static inline void
909iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
910{
911}
912
913static inline int
914iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
915{
916 return -ENODEV;
917}
918
919static inline struct iommu_sva *
920iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
921{
922 return NULL;
923}
924
925static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
926{
927}
928
929static inline int iommu_sva_set_ops(struct iommu_sva *handle,
930 const struct iommu_sva_ops *ops)
931{
932 return -EINVAL;
933}
934
935static inline int iommu_sva_get_pasid(struct iommu_sva *handle)
936{
937 return IOMMU_PASID_INVALID;
938}
939
940#endif /* CONFIG_IOMMU_API */
941
942#ifdef CONFIG_IOMMU_DEBUGFS
943extern struct dentry *iommu_debugfs_dir;
944void iommu_debugfs_setup(void);
945#else
946static inline void iommu_debugfs_setup(void) {}
947#endif
948
949#endif /* __LINUX_IOMMU_H */