1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
7 #ifndef __LINUX_IOMMU_H
8 #define __LINUX_IOMMU_H
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>
16 #include <uapi/linux/iommu.h>
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 */
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.
32 #define IOMMU_PRIV (1 << 5)
39 struct iommu_domain_ops;
40 struct notifier_block;
42 struct iommu_fault_event;
43 struct iommu_dma_cookie;
45 /* iommu fault flags */
46 #define IOMMU_FAULT_READ 0x0
47 #define IOMMU_FAULT_WRITE 0x1
49 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
50 struct device *, unsigned long, int, void *);
51 typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);
53 struct iommu_domain_geometry {
54 dma_addr_t aperture_start; /* First address that can be mapped */
55 dma_addr_t aperture_end; /* Last address that can be mapped */
56 bool force_aperture; /* DMA only allowed in mappable range? */
59 /* Domain feature flags */
60 #define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
61 #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
63 #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
64 #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */
66 #define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */
69 * This are the possible domain-types
71 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
73 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
74 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
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 * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB
81 * IOMMU_DOMAIN_SVA - DMA addresses are shared process addresses
82 * represented by mm_struct's.
84 #define IOMMU_DOMAIN_BLOCKED (0U)
85 #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
86 #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
87 #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
88 __IOMMU_DOMAIN_DMA_API)
89 #define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \
90 __IOMMU_DOMAIN_DMA_API | \
91 __IOMMU_DOMAIN_DMA_FQ)
92 #define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA)
96 const struct iommu_domain_ops *ops;
97 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
98 struct iommu_domain_geometry geometry;
99 struct iommu_dma_cookie *iova_cookie;
100 enum iommu_page_response_code (*iopf_handler)(struct iommu_fault *fault,
105 iommu_fault_handler_t handler;
108 struct { /* IOMMU_DOMAIN_SVA */
109 struct mm_struct *mm;
115 static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
117 return domain->type & __IOMMU_DOMAIN_DMA_API;
121 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU_CACHE is supported */
122 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
123 IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
124 DMA protection and we should too */
126 * Per-device flag indicating if enforce_cache_coherency() will work on
129 IOMMU_CAP_ENFORCE_CACHE_COHERENCY,
132 /* These are the possible reserved region types */
133 enum iommu_resv_type {
134 /* Memory regions which must be mapped 1:1 at all times */
137 * Memory regions which are advertised to be 1:1 but are
138 * commonly considered relaxable in some conditions,
139 * for instance in device assignment use case (USB, Graphics)
141 IOMMU_RESV_DIRECT_RELAXABLE,
142 /* Arbitrary "never map this or give it to a device" address ranges */
144 /* Hardware MSI region (untranslated) */
146 /* Software-managed MSI translation window */
151 * struct iommu_resv_region - descriptor for a reserved memory region
152 * @list: Linked list pointers
153 * @start: System physical start address of the region
154 * @length: Length of the region in bytes
155 * @prot: IOMMU Protection flags (READ/WRITE/...)
156 * @type: Type of the reserved region
157 * @free: Callback to free associated memory allocations
159 struct iommu_resv_region {
160 struct list_head list;
164 enum iommu_resv_type type;
165 void (*free)(struct device *dev, struct iommu_resv_region *region);
168 struct iommu_iort_rmr_data {
169 struct iommu_resv_region rr;
171 /* Stream IDs associated with IORT RMR entry */
177 * enum iommu_dev_features - Per device IOMMU features
178 * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
179 * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
180 * enabling %IOMMU_DEV_FEAT_SVA requires
181 * %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
182 * Faults themselves instead of relying on the IOMMU. When
183 * supported, this feature must be enabled before and
184 * disabled after %IOMMU_DEV_FEAT_SVA.
186 * Device drivers enable a feature using iommu_dev_enable_feature().
188 enum iommu_dev_features {
193 #define IOMMU_PASID_INVALID (-1U)
194 typedef unsigned int ioasid_t;
196 #ifdef CONFIG_IOMMU_API
199 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
201 * @start: IOVA representing the start of the range to be flushed
202 * @end: IOVA representing the end of the range to be flushed (inclusive)
203 * @pgsize: The interval at which to perform the flush
204 * @freelist: Removed pages to free after sync
205 * @queued: Indicates that the flush will be queued
207 * This structure is intended to be updated by multiple calls to the
208 * ->unmap() function in struct iommu_ops before eventually being passed
209 * into ->iotlb_sync(). Drivers can add pages to @freelist to be freed after
210 * ->iotlb_sync() or ->iotlb_flush_all() have cleared all cached references to
211 * them. @queued is set to indicate when ->iotlb_flush_all() will be called
212 * later instead of ->iotlb_sync(), so drivers may optimise accordingly.
214 struct iommu_iotlb_gather {
218 struct list_head freelist;
223 * struct iommu_ops - iommu ops and capabilities
224 * @capable: check capability
225 * @domain_alloc: allocate iommu domain
226 * @probe_device: Add device to iommu driver handling
227 * @release_device: Remove device from iommu driver handling
228 * @probe_finalize: Do final setup work after the device is added to an IOMMU
229 * group and attached to the groups domain
230 * @set_platform_dma_ops: Returning control back to the platform DMA ops. This op
231 * is to support old IOMMU drivers, new drivers should use
232 * default domains, and the common IOMMU DMA ops.
233 * @device_group: find iommu group for a particular device
234 * @get_resv_regions: Request list of reserved regions for a device
235 * @of_xlate: add OF master IDs to iommu grouping
236 * @is_attach_deferred: Check if domain attach should be deferred from iommu
237 * driver init to device driver init (default no)
238 * @dev_enable/disable_feat: per device entries to enable/disable
239 * iommu specific features.
240 * @page_response: handle page request response
241 * @def_domain_type: device default domain type, return value:
242 * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
243 * - IOMMU_DOMAIN_DMA: must use a dma domain
244 * - 0: use the default setting
245 * @default_domain_ops: the default ops for domains
246 * @remove_dev_pasid: Remove any translation configurations of a specific
247 * pasid, so that any DMA transactions with this pasid
248 * will be blocked by the hardware.
249 * @pgsize_bitmap: bitmap of all possible supported page sizes
250 * @owner: Driver module providing these ops
253 bool (*capable)(struct device *dev, enum iommu_cap);
255 /* Domain allocation and freeing by the iommu driver */
256 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
258 struct iommu_device *(*probe_device)(struct device *dev);
259 void (*release_device)(struct device *dev);
260 void (*probe_finalize)(struct device *dev);
261 void (*set_platform_dma_ops)(struct device *dev);
262 struct iommu_group *(*device_group)(struct device *dev);
264 /* Request/Free a list of reserved regions for a device */
265 void (*get_resv_regions)(struct device *dev, struct list_head *list);
267 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
268 bool (*is_attach_deferred)(struct device *dev);
270 /* Per device IOMMU features */
271 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
272 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
274 int (*page_response)(struct device *dev,
275 struct iommu_fault_event *evt,
276 struct iommu_page_response *msg);
278 int (*def_domain_type)(struct device *dev);
279 void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
281 const struct iommu_domain_ops *default_domain_ops;
282 unsigned long pgsize_bitmap;
283 struct module *owner;
287 * struct iommu_domain_ops - domain specific operations
288 * @attach_dev: attach an iommu domain to a device
291 * * EINVAL - can indicate that device and domain are incompatible due to
292 * some previous configuration of the domain, in which case the
293 * driver shouldn't log an error, since it is legitimate for a
294 * caller to test reuse of existing domains. Otherwise, it may
295 * still represent some other fundamental problem
296 * * ENOMEM - out of memory
297 * * ENOSPC - non-ENOMEM type of resource allocation failures
298 * * EBUSY - device is attached to a domain and cannot be changed
299 * * ENODEV - device specific errors, not able to be attached
300 * * <others> - treated as ENODEV by the caller. Use is discouraged
301 * @set_dev_pasid: set an iommu domain to a pasid of device
302 * @map: map a physically contiguous memory region to an iommu domain
303 * @map_pages: map a physically contiguous set of pages of the same size to
305 * @unmap: unmap a physically contiguous memory region from an iommu domain
306 * @unmap_pages: unmap a number of pages of the same size from an iommu domain
307 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
308 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
309 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
311 * @iova_to_phys: translate iova to physical address
312 * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
313 * including no-snoop TLPs on PCIe or other platform
314 * specific mechanisms.
315 * @enable_nesting: Enable nesting
316 * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
317 * @free: Release the domain after use.
319 struct iommu_domain_ops {
320 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
321 int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
324 int (*map)(struct iommu_domain *domain, unsigned long iova,
325 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
326 int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
327 phys_addr_t paddr, size_t pgsize, size_t pgcount,
328 int prot, gfp_t gfp, size_t *mapped);
329 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
330 size_t size, struct iommu_iotlb_gather *iotlb_gather);
331 size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
332 size_t pgsize, size_t pgcount,
333 struct iommu_iotlb_gather *iotlb_gather);
335 void (*flush_iotlb_all)(struct iommu_domain *domain);
336 void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
338 void (*iotlb_sync)(struct iommu_domain *domain,
339 struct iommu_iotlb_gather *iotlb_gather);
341 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
344 bool (*enforce_cache_coherency)(struct iommu_domain *domain);
345 int (*enable_nesting)(struct iommu_domain *domain);
346 int (*set_pgtable_quirks)(struct iommu_domain *domain,
347 unsigned long quirks);
349 void (*free)(struct iommu_domain *domain);
353 * struct iommu_device - IOMMU core representation of one IOMMU hardware
355 * @list: Used by the iommu-core to keep a list of registered iommus
356 * @ops: iommu-ops for talking to this iommu
357 * @dev: struct device for sysfs handling
358 * @max_pasids: number of supported PASIDs
360 struct iommu_device {
361 struct list_head list;
362 const struct iommu_ops *ops;
363 struct fwnode_handle *fwnode;
369 * struct iommu_fault_event - Generic fault event
371 * Can represent recoverable faults such as a page requests or
372 * unrecoverable faults such as DMA or IRQ remapping faults.
374 * @fault: fault descriptor
375 * @list: pending fault event list, used for tracking responses
377 struct iommu_fault_event {
378 struct iommu_fault fault;
379 struct list_head list;
383 * struct iommu_fault_param - per-device IOMMU fault data
384 * @handler: Callback function to handle IOMMU faults at device level
385 * @data: handler private data
386 * @faults: holds the pending faults which needs response
387 * @lock: protect pending faults list
389 struct iommu_fault_param {
390 iommu_dev_fault_handler_t handler;
392 struct list_head faults;
397 * struct dev_iommu - Collection of per-device IOMMU data
399 * @fault_param: IOMMU detected device fault reporting data
400 * @iopf_param: I/O Page Fault queue and data
401 * @fwspec: IOMMU fwspec data
402 * @iommu_dev: IOMMU device this device is linked to
403 * @priv: IOMMU Driver private data
404 * @max_pasids: number of PASIDs this device can consume
405 * @attach_deferred: the dma domain attachment is deferred
407 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
408 * struct iommu_group *iommu_group;
412 struct iommu_fault_param *fault_param;
413 struct iopf_device_param *iopf_param;
414 struct iommu_fwspec *fwspec;
415 struct iommu_device *iommu_dev;
418 u32 attach_deferred:1;
421 int iommu_device_register(struct iommu_device *iommu,
422 const struct iommu_ops *ops,
423 struct device *hwdev);
424 void iommu_device_unregister(struct iommu_device *iommu);
425 int iommu_device_sysfs_add(struct iommu_device *iommu,
426 struct device *parent,
427 const struct attribute_group **groups,
428 const char *fmt, ...) __printf(4, 5);
429 void iommu_device_sysfs_remove(struct iommu_device *iommu);
430 int iommu_device_link(struct iommu_device *iommu, struct device *link);
431 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
432 int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
434 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
436 return (struct iommu_device *)dev_get_drvdata(dev);
439 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
441 *gather = (struct iommu_iotlb_gather) {
443 .freelist = LIST_HEAD_INIT(gather->freelist),
447 static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
450 * Assume that valid ops must be installed if iommu_probe_device()
451 * has succeeded. The device ops are essentially for internal use
452 * within the IOMMU subsystem itself, so we should be able to trust
453 * ourselves not to misuse the helper.
455 return dev->iommu->iommu_dev->ops;
458 extern int bus_iommu_probe(const struct bus_type *bus);
459 extern bool iommu_present(const struct bus_type *bus);
460 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
461 extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
462 extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
463 extern void iommu_domain_free(struct iommu_domain *domain);
464 extern int iommu_attach_device(struct iommu_domain *domain,
466 extern void iommu_detach_device(struct iommu_domain *domain,
468 extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
469 struct device *dev, ioasid_t pasid);
470 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
471 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
472 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
473 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
474 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
476 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
477 unsigned long iova, size_t size,
478 struct iommu_iotlb_gather *iotlb_gather);
479 extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
480 struct scatterlist *sg, unsigned int nents,
481 int prot, gfp_t gfp);
482 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
483 extern void iommu_set_fault_handler(struct iommu_domain *domain,
484 iommu_fault_handler_t handler, void *token);
486 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
487 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
488 extern void iommu_set_default_passthrough(bool cmd_line);
489 extern void iommu_set_default_translated(bool cmd_line);
490 extern bool iommu_default_passthrough(void);
491 extern struct iommu_resv_region *
492 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
493 enum iommu_resv_type type, gfp_t gfp);
494 extern int iommu_get_group_resv_regions(struct iommu_group *group,
495 struct list_head *head);
497 extern int iommu_attach_group(struct iommu_domain *domain,
498 struct iommu_group *group);
499 extern void iommu_detach_group(struct iommu_domain *domain,
500 struct iommu_group *group);
501 extern struct iommu_group *iommu_group_alloc(void);
502 extern void *iommu_group_get_iommudata(struct iommu_group *group);
503 extern void iommu_group_set_iommudata(struct iommu_group *group,
505 void (*release)(void *iommu_data));
506 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
507 extern int iommu_group_add_device(struct iommu_group *group,
509 extern void iommu_group_remove_device(struct device *dev);
510 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
511 int (*fn)(struct device *, void *));
512 extern struct iommu_group *iommu_group_get(struct device *dev);
513 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
514 extern void iommu_group_put(struct iommu_group *group);
515 extern int iommu_register_device_fault_handler(struct device *dev,
516 iommu_dev_fault_handler_t handler,
519 extern int iommu_unregister_device_fault_handler(struct device *dev);
521 extern int iommu_report_device_fault(struct device *dev,
522 struct iommu_fault_event *evt);
523 extern int iommu_page_response(struct device *dev,
524 struct iommu_page_response *msg);
526 extern int iommu_group_id(struct iommu_group *group);
527 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
529 int iommu_enable_nesting(struct iommu_domain *domain);
530 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
531 unsigned long quirks);
533 void iommu_set_dma_strict(void);
535 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
536 unsigned long iova, int flags);
538 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
540 if (domain->ops->flush_iotlb_all)
541 domain->ops->flush_iotlb_all(domain);
544 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
545 struct iommu_iotlb_gather *iotlb_gather)
547 if (domain->ops->iotlb_sync)
548 domain->ops->iotlb_sync(domain, iotlb_gather);
550 iommu_iotlb_gather_init(iotlb_gather);
554 * iommu_iotlb_gather_is_disjoint - Checks whether a new range is disjoint
556 * @gather: TLB gather data
557 * @iova: start of page to invalidate
558 * @size: size of page to invalidate
560 * Helper for IOMMU drivers to check whether a new range and the gathered range
561 * are disjoint. For many IOMMUs, flushing the IOMMU in this case is better
562 * than merging the two, which might lead to unnecessary invalidations.
565 bool iommu_iotlb_gather_is_disjoint(struct iommu_iotlb_gather *gather,
566 unsigned long iova, size_t size)
568 unsigned long start = iova, end = start + size - 1;
570 return gather->end != 0 &&
571 (end + 1 < gather->start || start > gather->end + 1);
576 * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation
577 * @gather: TLB gather data
578 * @iova: start of page to invalidate
579 * @size: size of page to invalidate
581 * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands
582 * where only the address range matters, and simply minimising intermediate
583 * syncs is preferred.
585 static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather,
586 unsigned long iova, size_t size)
588 unsigned long end = iova + size - 1;
590 if (gather->start > iova)
591 gather->start = iova;
592 if (gather->end < end)
597 * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation
598 * @domain: IOMMU domain to be invalidated
599 * @gather: TLB gather data
600 * @iova: start of page to invalidate
601 * @size: size of page to invalidate
603 * Helper for IOMMU drivers to build invalidation commands based on individual
604 * pages, or with page size/table level hints which cannot be gathered if they
607 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
608 struct iommu_iotlb_gather *gather,
609 unsigned long iova, size_t size)
612 * If the new page is disjoint from the current range or is mapped at
613 * a different granularity, then sync the TLB so that the gather
614 * structure can be rewritten.
616 if ((gather->pgsize && gather->pgsize != size) ||
617 iommu_iotlb_gather_is_disjoint(gather, iova, size))
618 iommu_iotlb_sync(domain, gather);
620 gather->pgsize = size;
621 iommu_iotlb_gather_add_range(gather, iova, size);
624 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
626 return gather && gather->queued;
629 /* PCI device grouping function */
630 extern struct iommu_group *pci_device_group(struct device *dev);
631 /* Generic device grouping function */
632 extern struct iommu_group *generic_device_group(struct device *dev);
633 /* FSL-MC device grouping function */
634 struct iommu_group *fsl_mc_device_group(struct device *dev);
637 * struct iommu_fwspec - per-device IOMMU instance data
638 * @ops: ops for this device's IOMMU
639 * @iommu_fwnode: firmware handle for this device's IOMMU
640 * @flags: IOMMU_FWSPEC_* flags
641 * @num_ids: number of associated device IDs
642 * @ids: IDs which this device may present to the IOMMU
644 * Note that the IDs (and any other information, really) stored in this structure should be
645 * considered private to the IOMMU device driver and are not to be used directly by IOMMU
648 struct iommu_fwspec {
649 const struct iommu_ops *ops;
650 struct fwnode_handle *iommu_fwnode;
652 unsigned int num_ids;
656 /* ATS is supported */
657 #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
660 * struct iommu_sva - handle to a device-mm bond
664 struct iommu_domain *domain;
667 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
668 const struct iommu_ops *ops);
669 void iommu_fwspec_free(struct device *dev);
670 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
671 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
673 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
676 return dev->iommu->fwspec;
681 static inline void dev_iommu_fwspec_set(struct device *dev,
682 struct iommu_fwspec *fwspec)
684 dev->iommu->fwspec = fwspec;
687 static inline void *dev_iommu_priv_get(struct device *dev)
690 return dev->iommu->priv;
695 static inline void dev_iommu_priv_set(struct device *dev, void *priv)
697 dev->iommu->priv = priv;
700 int iommu_probe_device(struct device *dev);
702 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
703 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
705 int iommu_device_use_default_domain(struct device *dev);
706 void iommu_device_unuse_default_domain(struct device *dev);
708 int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
709 void iommu_group_release_dma_owner(struct iommu_group *group);
710 bool iommu_group_dma_owner_claimed(struct iommu_group *group);
712 int iommu_device_claim_dma_owner(struct device *dev, void *owner);
713 void iommu_device_release_dma_owner(struct device *dev);
715 struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
716 struct mm_struct *mm);
717 int iommu_attach_device_pasid(struct iommu_domain *domain,
718 struct device *dev, ioasid_t pasid);
719 void iommu_detach_device_pasid(struct iommu_domain *domain,
720 struct device *dev, ioasid_t pasid);
721 struct iommu_domain *
722 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
724 #else /* CONFIG_IOMMU_API */
727 struct iommu_group {};
728 struct iommu_fwspec {};
729 struct iommu_device {};
730 struct iommu_fault_param {};
731 struct iommu_iotlb_gather {};
733 static inline bool iommu_present(const struct bus_type *bus)
738 static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
743 static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
748 static inline void iommu_domain_free(struct iommu_domain *domain)
752 static inline int iommu_attach_device(struct iommu_domain *domain,
758 static inline void iommu_detach_device(struct iommu_domain *domain,
763 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
768 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
769 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
774 static inline size_t iommu_unmap(struct iommu_domain *domain,
775 unsigned long iova, size_t size)
780 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
781 unsigned long iova, int gfp_order,
782 struct iommu_iotlb_gather *iotlb_gather)
787 static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
788 unsigned long iova, struct scatterlist *sg,
789 unsigned int nents, int prot, gfp_t gfp)
794 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
798 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
799 struct iommu_iotlb_gather *iotlb_gather)
803 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
808 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
809 iommu_fault_handler_t handler, void *token)
813 static inline void iommu_get_resv_regions(struct device *dev,
814 struct list_head *list)
818 static inline void iommu_put_resv_regions(struct device *dev,
819 struct list_head *list)
823 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
824 struct list_head *head)
829 static inline void iommu_set_default_passthrough(bool cmd_line)
833 static inline void iommu_set_default_translated(bool cmd_line)
837 static inline bool iommu_default_passthrough(void)
842 static inline int iommu_attach_group(struct iommu_domain *domain,
843 struct iommu_group *group)
848 static inline void iommu_detach_group(struct iommu_domain *domain,
849 struct iommu_group *group)
853 static inline struct iommu_group *iommu_group_alloc(void)
855 return ERR_PTR(-ENODEV);
858 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
863 static inline void iommu_group_set_iommudata(struct iommu_group *group,
865 void (*release)(void *iommu_data))
869 static inline int iommu_group_set_name(struct iommu_group *group,
875 static inline int iommu_group_add_device(struct iommu_group *group,
881 static inline void iommu_group_remove_device(struct device *dev)
885 static inline int iommu_group_for_each_dev(struct iommu_group *group,
887 int (*fn)(struct device *, void *))
892 static inline struct iommu_group *iommu_group_get(struct device *dev)
897 static inline void iommu_group_put(struct iommu_group *group)
902 int iommu_register_device_fault_handler(struct device *dev,
903 iommu_dev_fault_handler_t handler,
909 static inline int iommu_unregister_device_fault_handler(struct device *dev)
915 int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
920 static inline int iommu_page_response(struct device *dev,
921 struct iommu_page_response *msg)
926 static inline int iommu_group_id(struct iommu_group *group)
931 static inline int iommu_set_pgtable_quirks(struct iommu_domain *domain,
932 unsigned long quirks)
937 static inline int iommu_device_register(struct iommu_device *iommu,
938 const struct iommu_ops *ops,
939 struct device *hwdev)
944 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
949 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
953 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
954 struct iommu_iotlb_gather *gather,
955 unsigned long iova, size_t size)
959 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
964 static inline void iommu_device_unregister(struct iommu_device *iommu)
968 static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
969 struct device *parent,
970 const struct attribute_group **groups,
971 const char *fmt, ...)
976 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
980 static inline int iommu_device_link(struct device *dev, struct device *link)
985 static inline void iommu_device_unlink(struct device *dev, struct device *link)
989 static inline int iommu_fwspec_init(struct device *dev,
990 struct fwnode_handle *iommu_fwnode,
991 const struct iommu_ops *ops)
996 static inline void iommu_fwspec_free(struct device *dev)
1000 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
1007 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
1013 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
1019 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1024 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1029 static inline int iommu_device_use_default_domain(struct device *dev)
1034 static inline void iommu_device_unuse_default_domain(struct device *dev)
1039 iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
1044 static inline void iommu_group_release_dma_owner(struct iommu_group *group)
1048 static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
1053 static inline void iommu_device_release_dma_owner(struct device *dev)
1057 static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
1062 static inline struct iommu_domain *
1063 iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
1068 static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
1069 struct device *dev, ioasid_t pasid)
1074 static inline void iommu_detach_device_pasid(struct iommu_domain *domain,
1075 struct device *dev, ioasid_t pasid)
1079 static inline struct iommu_domain *
1080 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
1085 #endif /* CONFIG_IOMMU_API */
1088 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1089 * @domain: The IOMMU domain to perform the mapping
1090 * @iova: The start address to map the buffer
1091 * @sgt: The sg_table object describing the buffer
1092 * @prot: IOMMU protection bits
1094 * Creates a mapping at @iova for the buffer described by a scatterlist
1095 * stored in the given sg_table object in the provided IOMMU domain.
1097 static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
1098 unsigned long iova, struct sg_table *sgt, int prot)
1100 return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,
1104 #ifdef CONFIG_IOMMU_DEBUGFS
1105 extern struct dentry *iommu_debugfs_dir;
1106 void iommu_debugfs_setup(void);
1108 static inline void iommu_debugfs_setup(void) {}
1111 #ifdef CONFIG_IOMMU_DMA
1112 #include <linux/msi.h>
1114 /* Setup call for arch DMA mapping code */
1115 void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
1117 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
1119 int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
1120 void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg);
1122 #else /* CONFIG_IOMMU_DMA */
1127 static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
1131 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
1136 static inline int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
1141 static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
1145 #endif /* CONFIG_IOMMU_DMA */
1148 * Newer generations of Tegra SoCs require devices' stream IDs to be directly programmed into
1149 * some registers. These are always paired with a Tegra SMMU or ARM SMMU, for which the contents
1150 * of the struct iommu_fwspec are known. Use this helper to formalize access to these internals.
1152 #define TEGRA_STREAM_ID_BYPASS 0x7f
1154 static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream_id)
1156 #ifdef CONFIG_IOMMU_API
1157 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1159 if (fwspec && fwspec->num_ids == 1) {
1160 *stream_id = fwspec->ids[0] & 0xffff;
1168 #ifdef CONFIG_IOMMU_SVA
1169 static inline void mm_pasid_init(struct mm_struct *mm)
1171 mm->pasid = IOMMU_PASID_INVALID;
1173 static inline bool mm_valid_pasid(struct mm_struct *mm)
1175 return mm->pasid != IOMMU_PASID_INVALID;
1177 void mm_pasid_drop(struct mm_struct *mm);
1178 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
1179 struct mm_struct *mm);
1180 void iommu_sva_unbind_device(struct iommu_sva *handle);
1181 u32 iommu_sva_get_pasid(struct iommu_sva *handle);
1183 static inline struct iommu_sva *
1184 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
1189 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1193 static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1195 return IOMMU_PASID_INVALID;
1197 static inline void mm_pasid_init(struct mm_struct *mm) {}
1198 static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
1199 static inline void mm_pasid_drop(struct mm_struct *mm) {}
1200 #endif /* CONFIG_IOMMU_SVA */
1202 #endif /* __LINUX_IOMMU_H */