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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 <linux/ioasid.h>
17#include <uapi/linux/iommu.h>
18
19#define IOMMU_READ (1 << 0)
20#define IOMMU_WRITE (1 << 1)
21#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
22#define IOMMU_NOEXEC (1 << 3)
23#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
24/*
25 * Where the bus hardware includes a privilege level as part of its access type
26 * markings, and certain devices are capable of issuing transactions marked as
27 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
28 * given permission flags only apply to accesses at the higher privilege level,
29 * and that unprivileged transactions should have as little access as possible.
30 * This would usually imply the same permissions as kernel mappings on the CPU,
31 * if the IOMMU page table format is equivalent.
32 */
33#define IOMMU_PRIV (1 << 5)
34
35struct iommu_ops;
36struct iommu_group;
37struct bus_type;
38struct device;
39struct iommu_domain;
40struct notifier_block;
41struct iommu_sva;
42struct iommu_fault_event;
43
44/* iommu fault flags */
45#define IOMMU_FAULT_READ 0x0
46#define IOMMU_FAULT_WRITE 0x1
47
48typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
49 struct device *, unsigned long, int, void *);
50typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);
51
52struct iommu_domain_geometry {
53 dma_addr_t aperture_start; /* First address that can be mapped */
54 dma_addr_t aperture_end; /* Last address that can be mapped */
55 bool force_aperture; /* DMA only allowed in mappable range? */
56};
57
58/* Domain feature flags */
59#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
60#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
61 implementation */
62#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
63
64/*
65 * This are the possible domain-types
66 *
67 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
68 * devices
69 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
70 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
71 * for VMs
72 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
73 * This flag allows IOMMU drivers to implement
74 * certain optimizations for these domains
75 */
76#define IOMMU_DOMAIN_BLOCKED (0U)
77#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
78#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
79#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
80 __IOMMU_DOMAIN_DMA_API)
81
82struct iommu_domain {
83 unsigned type;
84 const struct iommu_ops *ops;
85 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
86 iommu_fault_handler_t handler;
87 void *handler_token;
88 struct iommu_domain_geometry geometry;
89 void *iova_cookie;
90};
91
92enum iommu_cap {
93 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
94 transactions */
95 IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
96 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
97};
98
99/*
100 * Following constraints are specifc to FSL_PAMUV1:
101 * -aperture must be power of 2, and naturally aligned
102 * -number of windows must be power of 2, and address space size
103 * of each window is determined by aperture size / # of windows
104 * -the actual size of the mapped region of a window must be power
105 * of 2 starting with 4KB and physical address must be naturally
106 * aligned.
107 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
108 * The caller can invoke iommu_domain_get_attr to check if the underlying
109 * iommu implementation supports these constraints.
110 */
111
112enum iommu_attr {
113 DOMAIN_ATTR_GEOMETRY,
114 DOMAIN_ATTR_PAGING,
115 DOMAIN_ATTR_WINDOWS,
116 DOMAIN_ATTR_FSL_PAMU_STASH,
117 DOMAIN_ATTR_FSL_PAMU_ENABLE,
118 DOMAIN_ATTR_FSL_PAMUV1,
119 DOMAIN_ATTR_NESTING, /* two stages of translation */
120 DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
121 DOMAIN_ATTR_MAX,
122};
123
124/* These are the possible reserved region types */
125enum iommu_resv_type {
126 /* Memory regions which must be mapped 1:1 at all times */
127 IOMMU_RESV_DIRECT,
128 /*
129 * Memory regions which are advertised to be 1:1 but are
130 * commonly considered relaxable in some conditions,
131 * for instance in device assignment use case (USB, Graphics)
132 */
133 IOMMU_RESV_DIRECT_RELAXABLE,
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/* Per device IOMMU features */
159enum iommu_dev_features {
160 IOMMU_DEV_FEAT_AUX, /* Aux-domain feature */
161 IOMMU_DEV_FEAT_SVA, /* Shared Virtual Addresses */
162};
163
164#define IOMMU_PASID_INVALID (-1U)
165
166#ifdef CONFIG_IOMMU_API
167
168/**
169 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
170 *
171 * @start: IOVA representing the start of the range to be flushed
172 * @end: IOVA representing the end of the range to be flushed (exclusive)
173 * @pgsize: The interval at which to perform the flush
174 *
175 * This structure is intended to be updated by multiple calls to the
176 * ->unmap() function in struct iommu_ops before eventually being passed
177 * into ->iotlb_sync().
178 */
179struct iommu_iotlb_gather {
180 unsigned long start;
181 unsigned long end;
182 size_t pgsize;
183};
184
185/**
186 * struct iommu_ops - iommu ops and capabilities
187 * @capable: check capability
188 * @domain_alloc: allocate iommu domain
189 * @domain_free: free iommu domain
190 * @attach_dev: attach device to an iommu domain
191 * @detach_dev: detach device from an iommu domain
192 * @map: map a physically contiguous memory region to an iommu domain
193 * @unmap: unmap a physically contiguous memory region from an iommu domain
194 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
195 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
196 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
197 * queue
198 * @iova_to_phys: translate iova to physical address
199 * @probe_device: Add device to iommu driver handling
200 * @release_device: Remove device from iommu driver handling
201 * @probe_finalize: Do final setup work after the device is added to an IOMMU
202 * group and attached to the groups domain
203 * @device_group: find iommu group for a particular device
204 * @domain_get_attr: Query domain attributes
205 * @domain_set_attr: Change domain attributes
206 * @get_resv_regions: Request list of reserved regions for a device
207 * @put_resv_regions: Free list of reserved regions for a device
208 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
209 * @domain_window_enable: Configure and enable a particular window for a domain
210 * @domain_window_disable: Disable a particular window for a domain
211 * @of_xlate: add OF master IDs to iommu grouping
212 * @is_attach_deferred: Check if domain attach should be deferred from iommu
213 * driver init to device driver init (default no)
214 * @dev_has/enable/disable_feat: per device entries to check/enable/disable
215 * iommu specific features.
216 * @dev_feat_enabled: check enabled feature
217 * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
218 * @aux_get_pasid: get the pasid given an aux-domain
219 * @sva_bind: Bind process address space to device
220 * @sva_unbind: Unbind process address space from device
221 * @sva_get_pasid: Get PASID associated to a SVA handle
222 * @page_response: handle page request response
223 * @cache_invalidate: invalidate translation caches
224 * @sva_bind_gpasid: bind guest pasid and mm
225 * @sva_unbind_gpasid: unbind guest pasid and mm
226 * @def_domain_type: device default domain type, return value:
227 * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
228 * - IOMMU_DOMAIN_DMA: must use a dma domain
229 * - 0: use the default setting
230 * @pgsize_bitmap: bitmap of all possible supported page sizes
231 * @owner: Driver module providing these ops
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, gfp_t gfp);
244 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
245 size_t size, struct iommu_iotlb_gather *iotlb_gather);
246 void (*flush_iotlb_all)(struct iommu_domain *domain);
247 void (*iotlb_sync_map)(struct iommu_domain *domain);
248 void (*iotlb_sync)(struct iommu_domain *domain,
249 struct iommu_iotlb_gather *iotlb_gather);
250 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
251 struct iommu_device *(*probe_device)(struct device *dev);
252 void (*release_device)(struct device *dev);
253 void (*probe_finalize)(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 u32 (*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 int (*cache_invalidate)(struct iommu_domain *domain, struct device *dev,
295 struct iommu_cache_invalidate_info *inv_info);
296 int (*sva_bind_gpasid)(struct iommu_domain *domain,
297 struct device *dev, struct iommu_gpasid_bind_data *data);
298
299 int (*sva_unbind_gpasid)(struct device *dev, u32 pasid);
300
301 int (*def_domain_type)(struct device *dev);
302
303 unsigned long pgsize_bitmap;
304 struct module *owner;
305};
306
307/**
308 * struct iommu_device - IOMMU core representation of one IOMMU hardware
309 * instance
310 * @list: Used by the iommu-core to keep a list of registered iommus
311 * @ops: iommu-ops for talking to this iommu
312 * @dev: struct device for sysfs handling
313 */
314struct iommu_device {
315 struct list_head list;
316 const struct iommu_ops *ops;
317 struct fwnode_handle *fwnode;
318 struct device *dev;
319};
320
321/**
322 * struct iommu_fault_event - Generic fault event
323 *
324 * Can represent recoverable faults such as a page requests or
325 * unrecoverable faults such as DMA or IRQ remapping faults.
326 *
327 * @fault: fault descriptor
328 * @list: pending fault event list, used for tracking responses
329 */
330struct iommu_fault_event {
331 struct iommu_fault fault;
332 struct list_head list;
333};
334
335/**
336 * struct iommu_fault_param - per-device IOMMU fault data
337 * @handler: Callback function to handle IOMMU faults at device level
338 * @data: handler private data
339 * @faults: holds the pending faults which needs response
340 * @lock: protect pending faults list
341 */
342struct iommu_fault_param {
343 iommu_dev_fault_handler_t handler;
344 void *data;
345 struct list_head faults;
346 struct mutex lock;
347};
348
349/**
350 * struct dev_iommu - Collection of per-device IOMMU data
351 *
352 * @fault_param: IOMMU detected device fault reporting data
353 * @fwspec: IOMMU fwspec data
354 * @iommu_dev: IOMMU device this device is linked to
355 * @priv: IOMMU Driver private data
356 *
357 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
358 * struct iommu_group *iommu_group;
359 */
360struct dev_iommu {
361 struct mutex lock;
362 struct iommu_fault_param *fault_param;
363 struct iommu_fwspec *fwspec;
364 struct iommu_device *iommu_dev;
365 void *priv;
366};
367
368int iommu_device_register(struct iommu_device *iommu);
369void iommu_device_unregister(struct iommu_device *iommu);
370int iommu_device_sysfs_add(struct iommu_device *iommu,
371 struct device *parent,
372 const struct attribute_group **groups,
373 const char *fmt, ...) __printf(4, 5);
374void iommu_device_sysfs_remove(struct iommu_device *iommu);
375int iommu_device_link(struct iommu_device *iommu, struct device *link);
376void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
377
378static inline void __iommu_device_set_ops(struct iommu_device *iommu,
379 const struct iommu_ops *ops)
380{
381 iommu->ops = ops;
382}
383
384#define iommu_device_set_ops(iommu, ops) \
385do { \
386 struct iommu_ops *__ops = (struct iommu_ops *)(ops); \
387 __ops->owner = THIS_MODULE; \
388 __iommu_device_set_ops(iommu, __ops); \
389} while (0)
390
391static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
392 struct fwnode_handle *fwnode)
393{
394 iommu->fwnode = fwnode;
395}
396
397static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
398{
399 return (struct iommu_device *)dev_get_drvdata(dev);
400}
401
402static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
403{
404 *gather = (struct iommu_iotlb_gather) {
405 .start = ULONG_MAX,
406 };
407}
408
409#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
410#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
411#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
412#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
413#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
414#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
415
416extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
417extern int bus_iommu_probe(struct bus_type *bus);
418extern bool iommu_present(struct bus_type *bus);
419extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
420extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
421extern struct iommu_group *iommu_group_get_by_id(int id);
422extern void iommu_domain_free(struct iommu_domain *domain);
423extern int iommu_attach_device(struct iommu_domain *domain,
424 struct device *dev);
425extern void iommu_detach_device(struct iommu_domain *domain,
426 struct device *dev);
427extern int iommu_uapi_cache_invalidate(struct iommu_domain *domain,
428 struct device *dev,
429 void __user *uinfo);
430
431extern int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
432 struct device *dev, void __user *udata);
433extern int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
434 struct device *dev, void __user *udata);
435extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
436 struct device *dev, ioasid_t pasid);
437extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
438extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
439extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
440 phys_addr_t paddr, size_t size, int prot);
441extern int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova,
442 phys_addr_t paddr, size_t size, int prot);
443extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
444 size_t size);
445extern size_t iommu_unmap_fast(struct iommu_domain *domain,
446 unsigned long iova, size_t size,
447 struct iommu_iotlb_gather *iotlb_gather);
448extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
449 struct scatterlist *sg,unsigned int nents, int prot);
450extern size_t iommu_map_sg_atomic(struct iommu_domain *domain,
451 unsigned long iova, struct scatterlist *sg,
452 unsigned int nents, int prot);
453extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
454extern void iommu_set_fault_handler(struct iommu_domain *domain,
455 iommu_fault_handler_t handler, void *token);
456
457extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
458extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
459extern void generic_iommu_put_resv_regions(struct device *dev,
460 struct list_head *list);
461extern void iommu_set_default_passthrough(bool cmd_line);
462extern void iommu_set_default_translated(bool cmd_line);
463extern bool iommu_default_passthrough(void);
464extern struct iommu_resv_region *
465iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
466 enum iommu_resv_type type);
467extern int iommu_get_group_resv_regions(struct iommu_group *group,
468 struct list_head *head);
469
470extern int iommu_attach_group(struct iommu_domain *domain,
471 struct iommu_group *group);
472extern void iommu_detach_group(struct iommu_domain *domain,
473 struct iommu_group *group);
474extern struct iommu_group *iommu_group_alloc(void);
475extern void *iommu_group_get_iommudata(struct iommu_group *group);
476extern void iommu_group_set_iommudata(struct iommu_group *group,
477 void *iommu_data,
478 void (*release)(void *iommu_data));
479extern int iommu_group_set_name(struct iommu_group *group, const char *name);
480extern int iommu_group_add_device(struct iommu_group *group,
481 struct device *dev);
482extern void iommu_group_remove_device(struct device *dev);
483extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
484 int (*fn)(struct device *, void *));
485extern struct iommu_group *iommu_group_get(struct device *dev);
486extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
487extern void iommu_group_put(struct iommu_group *group);
488extern int iommu_group_register_notifier(struct iommu_group *group,
489 struct notifier_block *nb);
490extern int iommu_group_unregister_notifier(struct iommu_group *group,
491 struct notifier_block *nb);
492extern int iommu_register_device_fault_handler(struct device *dev,
493 iommu_dev_fault_handler_t handler,
494 void *data);
495
496extern int iommu_unregister_device_fault_handler(struct device *dev);
497
498extern int iommu_report_device_fault(struct device *dev,
499 struct iommu_fault_event *evt);
500extern int iommu_page_response(struct device *dev,
501 struct iommu_page_response *msg);
502
503extern int iommu_group_id(struct iommu_group *group);
504extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
505
506extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
507 void *data);
508extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
509 void *data);
510
511/* Window handling function prototypes */
512extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
513 phys_addr_t offset, u64 size,
514 int prot);
515extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
516
517extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
518 unsigned long iova, int flags);
519
520static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
521{
522 if (domain->ops->flush_iotlb_all)
523 domain->ops->flush_iotlb_all(domain);
524}
525
526static inline void iommu_iotlb_sync(struct iommu_domain *domain,
527 struct iommu_iotlb_gather *iotlb_gather)
528{
529 if (domain->ops->iotlb_sync)
530 domain->ops->iotlb_sync(domain, iotlb_gather);
531
532 iommu_iotlb_gather_init(iotlb_gather);
533}
534
535static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
536 struct iommu_iotlb_gather *gather,
537 unsigned long iova, size_t size)
538{
539 unsigned long start = iova, end = start + size;
540
541 /*
542 * If the new page is disjoint from the current range or is mapped at
543 * a different granularity, then sync the TLB so that the gather
544 * structure can be rewritten.
545 */
546 if (gather->pgsize != size ||
547 end < gather->start || start > gather->end) {
548 if (gather->pgsize)
549 iommu_iotlb_sync(domain, gather);
550 gather->pgsize = size;
551 }
552
553 if (gather->end < end)
554 gather->end = end;
555
556 if (gather->start > start)
557 gather->start = start;
558}
559
560/* PCI device grouping function */
561extern struct iommu_group *pci_device_group(struct device *dev);
562/* Generic device grouping function */
563extern struct iommu_group *generic_device_group(struct device *dev);
564/* FSL-MC device grouping function */
565struct iommu_group *fsl_mc_device_group(struct device *dev);
566
567/**
568 * struct iommu_fwspec - per-device IOMMU instance data
569 * @ops: ops for this device's IOMMU
570 * @iommu_fwnode: firmware handle for this device's IOMMU
571 * @iommu_priv: IOMMU driver private data for this device
572 * @num_pasid_bits: number of PASID bits supported by this device
573 * @num_ids: number of associated device IDs
574 * @ids: IDs which this device may present to the IOMMU
575 */
576struct iommu_fwspec {
577 const struct iommu_ops *ops;
578 struct fwnode_handle *iommu_fwnode;
579 u32 flags;
580 u32 num_pasid_bits;
581 unsigned int num_ids;
582 u32 ids[];
583};
584
585/* ATS is supported */
586#define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
587
588/**
589 * struct iommu_sva - handle to a device-mm bond
590 */
591struct iommu_sva {
592 struct device *dev;
593};
594
595int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
596 const struct iommu_ops *ops);
597void iommu_fwspec_free(struct device *dev);
598int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
599const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
600
601static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
602{
603 if (dev->iommu)
604 return dev->iommu->fwspec;
605 else
606 return NULL;
607}
608
609static inline void dev_iommu_fwspec_set(struct device *dev,
610 struct iommu_fwspec *fwspec)
611{
612 dev->iommu->fwspec = fwspec;
613}
614
615static inline void *dev_iommu_priv_get(struct device *dev)
616{
617 return dev->iommu->priv;
618}
619
620static inline void dev_iommu_priv_set(struct device *dev, void *priv)
621{
622 dev->iommu->priv = priv;
623}
624
625int iommu_probe_device(struct device *dev);
626void iommu_release_device(struct device *dev);
627
628bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
629int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
630int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
631bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
632int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
633void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
634int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);
635
636struct iommu_sva *iommu_sva_bind_device(struct device *dev,
637 struct mm_struct *mm,
638 void *drvdata);
639void iommu_sva_unbind_device(struct iommu_sva *handle);
640u32 iommu_sva_get_pasid(struct iommu_sva *handle);
641
642#else /* CONFIG_IOMMU_API */
643
644struct iommu_ops {};
645struct iommu_group {};
646struct iommu_fwspec {};
647struct iommu_device {};
648struct iommu_fault_param {};
649struct iommu_iotlb_gather {};
650
651static inline bool iommu_present(struct bus_type *bus)
652{
653 return false;
654}
655
656static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
657{
658 return false;
659}
660
661static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
662{
663 return NULL;
664}
665
666static inline struct iommu_group *iommu_group_get_by_id(int id)
667{
668 return NULL;
669}
670
671static inline void iommu_domain_free(struct iommu_domain *domain)
672{
673}
674
675static inline int iommu_attach_device(struct iommu_domain *domain,
676 struct device *dev)
677{
678 return -ENODEV;
679}
680
681static inline void iommu_detach_device(struct iommu_domain *domain,
682 struct device *dev)
683{
684}
685
686static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
687{
688 return NULL;
689}
690
691static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
692 phys_addr_t paddr, size_t size, int prot)
693{
694 return -ENODEV;
695}
696
697static inline int iommu_map_atomic(struct iommu_domain *domain,
698 unsigned long iova, phys_addr_t paddr,
699 size_t size, int prot)
700{
701 return -ENODEV;
702}
703
704static inline size_t iommu_unmap(struct iommu_domain *domain,
705 unsigned long iova, size_t size)
706{
707 return 0;
708}
709
710static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
711 unsigned long iova, int gfp_order,
712 struct iommu_iotlb_gather *iotlb_gather)
713{
714 return 0;
715}
716
717static inline size_t iommu_map_sg(struct iommu_domain *domain,
718 unsigned long iova, struct scatterlist *sg,
719 unsigned int nents, int prot)
720{
721 return 0;
722}
723
724static inline size_t iommu_map_sg_atomic(struct iommu_domain *domain,
725 unsigned long iova, struct scatterlist *sg,
726 unsigned int nents, int prot)
727{
728 return 0;
729}
730
731static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
732{
733}
734
735static inline void iommu_iotlb_sync(struct iommu_domain *domain,
736 struct iommu_iotlb_gather *iotlb_gather)
737{
738}
739
740static inline int iommu_domain_window_enable(struct iommu_domain *domain,
741 u32 wnd_nr, phys_addr_t paddr,
742 u64 size, int prot)
743{
744 return -ENODEV;
745}
746
747static inline void iommu_domain_window_disable(struct iommu_domain *domain,
748 u32 wnd_nr)
749{
750}
751
752static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
753{
754 return 0;
755}
756
757static inline void iommu_set_fault_handler(struct iommu_domain *domain,
758 iommu_fault_handler_t handler, void *token)
759{
760}
761
762static inline void iommu_get_resv_regions(struct device *dev,
763 struct list_head *list)
764{
765}
766
767static inline void iommu_put_resv_regions(struct device *dev,
768 struct list_head *list)
769{
770}
771
772static inline int iommu_get_group_resv_regions(struct iommu_group *group,
773 struct list_head *head)
774{
775 return -ENODEV;
776}
777
778static inline void iommu_set_default_passthrough(bool cmd_line)
779{
780}
781
782static inline void iommu_set_default_translated(bool cmd_line)
783{
784}
785
786static inline bool iommu_default_passthrough(void)
787{
788 return true;
789}
790
791static inline int iommu_attach_group(struct iommu_domain *domain,
792 struct iommu_group *group)
793{
794 return -ENODEV;
795}
796
797static inline void iommu_detach_group(struct iommu_domain *domain,
798 struct iommu_group *group)
799{
800}
801
802static inline struct iommu_group *iommu_group_alloc(void)
803{
804 return ERR_PTR(-ENODEV);
805}
806
807static inline void *iommu_group_get_iommudata(struct iommu_group *group)
808{
809 return NULL;
810}
811
812static inline void iommu_group_set_iommudata(struct iommu_group *group,
813 void *iommu_data,
814 void (*release)(void *iommu_data))
815{
816}
817
818static inline int iommu_group_set_name(struct iommu_group *group,
819 const char *name)
820{
821 return -ENODEV;
822}
823
824static inline int iommu_group_add_device(struct iommu_group *group,
825 struct device *dev)
826{
827 return -ENODEV;
828}
829
830static inline void iommu_group_remove_device(struct device *dev)
831{
832}
833
834static inline int iommu_group_for_each_dev(struct iommu_group *group,
835 void *data,
836 int (*fn)(struct device *, void *))
837{
838 return -ENODEV;
839}
840
841static inline struct iommu_group *iommu_group_get(struct device *dev)
842{
843 return NULL;
844}
845
846static inline void iommu_group_put(struct iommu_group *group)
847{
848}
849
850static inline int iommu_group_register_notifier(struct iommu_group *group,
851 struct notifier_block *nb)
852{
853 return -ENODEV;
854}
855
856static inline int iommu_group_unregister_notifier(struct iommu_group *group,
857 struct notifier_block *nb)
858{
859 return 0;
860}
861
862static inline
863int iommu_register_device_fault_handler(struct device *dev,
864 iommu_dev_fault_handler_t handler,
865 void *data)
866{
867 return -ENODEV;
868}
869
870static inline int iommu_unregister_device_fault_handler(struct device *dev)
871{
872 return 0;
873}
874
875static inline
876int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
877{
878 return -ENODEV;
879}
880
881static inline int iommu_page_response(struct device *dev,
882 struct iommu_page_response *msg)
883{
884 return -ENODEV;
885}
886
887static inline int iommu_group_id(struct iommu_group *group)
888{
889 return -ENODEV;
890}
891
892static inline int iommu_domain_get_attr(struct iommu_domain *domain,
893 enum iommu_attr attr, void *data)
894{
895 return -EINVAL;
896}
897
898static inline int iommu_domain_set_attr(struct iommu_domain *domain,
899 enum iommu_attr attr, void *data)
900{
901 return -EINVAL;
902}
903
904static inline int iommu_device_register(struct iommu_device *iommu)
905{
906 return -ENODEV;
907}
908
909static inline void iommu_device_set_ops(struct iommu_device *iommu,
910 const struct iommu_ops *ops)
911{
912}
913
914static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
915 struct fwnode_handle *fwnode)
916{
917}
918
919static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
920{
921 return NULL;
922}
923
924static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
925{
926}
927
928static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
929 struct iommu_iotlb_gather *gather,
930 unsigned long iova, size_t size)
931{
932}
933
934static inline void iommu_device_unregister(struct iommu_device *iommu)
935{
936}
937
938static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
939 struct device *parent,
940 const struct attribute_group **groups,
941 const char *fmt, ...)
942{
943 return -ENODEV;
944}
945
946static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
947{
948}
949
950static inline int iommu_device_link(struct device *dev, struct device *link)
951{
952 return -EINVAL;
953}
954
955static inline void iommu_device_unlink(struct device *dev, struct device *link)
956{
957}
958
959static inline int iommu_fwspec_init(struct device *dev,
960 struct fwnode_handle *iommu_fwnode,
961 const struct iommu_ops *ops)
962{
963 return -ENODEV;
964}
965
966static inline void iommu_fwspec_free(struct device *dev)
967{
968}
969
970static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
971 int num_ids)
972{
973 return -ENODEV;
974}
975
976static inline
977const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
978{
979 return NULL;
980}
981
982static inline bool
983iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
984{
985 return false;
986}
987
988static inline bool
989iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
990{
991 return false;
992}
993
994static inline int
995iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
996{
997 return -ENODEV;
998}
999
1000static inline int
1001iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1002{
1003 return -ENODEV;
1004}
1005
1006static inline int
1007iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
1008{
1009 return -ENODEV;
1010}
1011
1012static inline void
1013iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
1014{
1015}
1016
1017static inline int
1018iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
1019{
1020 return -ENODEV;
1021}
1022
1023static inline struct iommu_sva *
1024iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
1025{
1026 return NULL;
1027}
1028
1029static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1030{
1031}
1032
1033static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1034{
1035 return IOMMU_PASID_INVALID;
1036}
1037
1038static inline int
1039iommu_uapi_cache_invalidate(struct iommu_domain *domain,
1040 struct device *dev,
1041 struct iommu_cache_invalidate_info *inv_info)
1042{
1043 return -ENODEV;
1044}
1045
1046static inline int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
1047 struct device *dev, void __user *udata)
1048{
1049 return -ENODEV;
1050}
1051
1052static inline int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
1053 struct device *dev, void __user *udata)
1054{
1055 return -ENODEV;
1056}
1057
1058static inline int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
1059 struct device *dev,
1060 ioasid_t pasid)
1061{
1062 return -ENODEV;
1063}
1064
1065static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1066{
1067 return NULL;
1068}
1069#endif /* CONFIG_IOMMU_API */
1070
1071/**
1072 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1073 * @domain: The IOMMU domain to perform the mapping
1074 * @iova: The start address to map the buffer
1075 * @sgt: The sg_table object describing the buffer
1076 * @prot: IOMMU protection bits
1077 *
1078 * Creates a mapping at @iova for the buffer described by a scatterlist
1079 * stored in the given sg_table object in the provided IOMMU domain.
1080 */
1081static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
1082 unsigned long iova, struct sg_table *sgt, int prot)
1083{
1084 return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot);
1085}
1086
1087#ifdef CONFIG_IOMMU_DEBUGFS
1088extern struct dentry *iommu_debugfs_dir;
1089void iommu_debugfs_setup(void);
1090#else
1091static inline void iommu_debugfs_setup(void) {}
1092#endif
1093
1094#endif /* __LINUX_IOMMU_H */