1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <joerg.roedel@amd.com>
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 <linux/iova_bitmap.h>
17 #include <uapi/linux/iommu.h>
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 */
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.
33 #define IOMMU_PRIV (1 << 5)
40 struct iommu_domain_ops;
41 struct iommu_dirty_ops;
42 struct notifier_block;
44 struct iommu_fault_event;
45 struct iommu_dma_cookie;
47 /* iommu fault flags */
48 #define IOMMU_FAULT_READ 0x0
49 #define IOMMU_FAULT_WRITE 0x1
51 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
52 struct device *, unsigned long, int, void *);
53 typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);
55 struct iommu_domain_geometry {
56 dma_addr_t aperture_start; /* First address that can be mapped */
57 dma_addr_t aperture_end; /* Last address that can be mapped */
58 bool force_aperture; /* DMA only allowed in mappable range? */
61 /* Domain feature flags */
62 #define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
63 #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
65 #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
66 #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */
68 #define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */
69 #define __IOMMU_DOMAIN_PLATFORM (1U << 5)
71 #define __IOMMU_DOMAIN_NESTED (1U << 6) /* User-managed address space nested
72 on a stage-2 translation */
74 #define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ
76 * This are the possible domain-types
78 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
80 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
81 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
83 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
84 * This flag allows IOMMU drivers to implement
85 * certain optimizations for these domains
86 * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB
88 * IOMMU_DOMAIN_SVA - DMA addresses are shared process addresses
89 * represented by mm_struct's.
90 * IOMMU_DOMAIN_PLATFORM - Legacy domain for drivers that do their own
91 * dma_api stuff. Do not use in new drivers.
93 #define IOMMU_DOMAIN_BLOCKED (0U)
94 #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
95 #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
96 #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
97 __IOMMU_DOMAIN_DMA_API)
98 #define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \
99 __IOMMU_DOMAIN_DMA_API | \
100 __IOMMU_DOMAIN_DMA_FQ)
101 #define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA)
102 #define IOMMU_DOMAIN_PLATFORM (__IOMMU_DOMAIN_PLATFORM)
103 #define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED)
105 struct iommu_domain {
107 const struct iommu_domain_ops *ops;
108 const struct iommu_dirty_ops *dirty_ops;
110 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
111 struct iommu_domain_geometry geometry;
112 struct iommu_dma_cookie *iova_cookie;
113 enum iommu_page_response_code (*iopf_handler)(struct iommu_fault *fault,
118 iommu_fault_handler_t handler;
121 struct { /* IOMMU_DOMAIN_SVA */
122 struct mm_struct *mm;
128 static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
130 return domain->type & __IOMMU_DOMAIN_DMA_API;
134 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU_CACHE is supported */
135 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
136 IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
137 DMA protection and we should too */
139 * Per-device flag indicating if enforce_cache_coherency() will work on
142 IOMMU_CAP_ENFORCE_CACHE_COHERENCY,
144 * IOMMU driver does not issue TLB maintenance during .unmap, so can
145 * usefully support the non-strict DMA flush queue.
147 IOMMU_CAP_DEFERRED_FLUSH,
148 IOMMU_CAP_DIRTY_TRACKING, /* IOMMU supports dirty tracking */
151 /* These are the possible reserved region types */
152 enum iommu_resv_type {
153 /* Memory regions which must be mapped 1:1 at all times */
156 * Memory regions which are advertised to be 1:1 but are
157 * commonly considered relaxable in some conditions,
158 * for instance in device assignment use case (USB, Graphics)
160 IOMMU_RESV_DIRECT_RELAXABLE,
161 /* Arbitrary "never map this or give it to a device" address ranges */
163 /* Hardware MSI region (untranslated) */
165 /* Software-managed MSI translation window */
170 * struct iommu_resv_region - descriptor for a reserved memory region
171 * @list: Linked list pointers
172 * @start: System physical start address of the region
173 * @length: Length of the region in bytes
174 * @prot: IOMMU Protection flags (READ/WRITE/...)
175 * @type: Type of the reserved region
176 * @free: Callback to free associated memory allocations
178 struct iommu_resv_region {
179 struct list_head list;
183 enum iommu_resv_type type;
184 void (*free)(struct device *dev, struct iommu_resv_region *region);
187 struct iommu_iort_rmr_data {
188 struct iommu_resv_region rr;
190 /* Stream IDs associated with IORT RMR entry */
196 * enum iommu_dev_features - Per device IOMMU features
197 * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
198 * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
199 * enabling %IOMMU_DEV_FEAT_SVA requires
200 * %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
201 * Faults themselves instead of relying on the IOMMU. When
202 * supported, this feature must be enabled before and
203 * disabled after %IOMMU_DEV_FEAT_SVA.
205 * Device drivers enable a feature using iommu_dev_enable_feature().
207 enum iommu_dev_features {
212 #define IOMMU_NO_PASID (0U) /* Reserved for DMA w/o PASID */
213 #define IOMMU_FIRST_GLOBAL_PASID (1U) /*starting range for allocation */
214 #define IOMMU_PASID_INVALID (-1U)
215 typedef unsigned int ioasid_t;
217 #ifdef CONFIG_IOMMU_API
220 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
222 * @start: IOVA representing the start of the range to be flushed
223 * @end: IOVA representing the end of the range to be flushed (inclusive)
224 * @pgsize: The interval at which to perform the flush
225 * @freelist: Removed pages to free after sync
226 * @queued: Indicates that the flush will be queued
228 * This structure is intended to be updated by multiple calls to the
229 * ->unmap() function in struct iommu_ops before eventually being passed
230 * into ->iotlb_sync(). Drivers can add pages to @freelist to be freed after
231 * ->iotlb_sync() or ->iotlb_flush_all() have cleared all cached references to
232 * them. @queued is set to indicate when ->iotlb_flush_all() will be called
233 * later instead of ->iotlb_sync(), so drivers may optimise accordingly.
235 struct iommu_iotlb_gather {
239 struct list_head freelist;
244 * struct iommu_dirty_bitmap - Dirty IOVA bitmap state
245 * @bitmap: IOVA bitmap
246 * @gather: Range information for a pending IOTLB flush
248 struct iommu_dirty_bitmap {
249 struct iova_bitmap *bitmap;
250 struct iommu_iotlb_gather *gather;
253 /* Read but do not clear any dirty bits */
254 #define IOMMU_DIRTY_NO_CLEAR (1 << 0)
257 * struct iommu_dirty_ops - domain specific dirty tracking operations
258 * @set_dirty_tracking: Enable or Disable dirty tracking on the iommu domain
259 * @read_and_clear_dirty: Walk IOMMU page tables for dirtied PTEs marshalled
260 * into a bitmap, with a bit represented as a page.
261 * Reads the dirty PTE bits and clears it from IO
264 struct iommu_dirty_ops {
265 int (*set_dirty_tracking)(struct iommu_domain *domain, bool enabled);
266 int (*read_and_clear_dirty)(struct iommu_domain *domain,
267 unsigned long iova, size_t size,
269 struct iommu_dirty_bitmap *dirty);
273 * struct iommu_user_data - iommu driver specific user space data info
274 * @type: The data type of the user buffer
275 * @uptr: Pointer to the user buffer for copy_from_user()
276 * @len: The length of the user buffer in bytes
278 * A user space data is an uAPI that is defined in include/uapi/linux/iommufd.h
279 * @type, @uptr and @len should be just copied from an iommufd core uAPI struct.
281 struct iommu_user_data {
288 * __iommu_copy_struct_from_user - Copy iommu driver specific user space data
289 * @dst_data: Pointer to an iommu driver specific user data that is defined in
290 * include/uapi/linux/iommufd.h
291 * @src_data: Pointer to a struct iommu_user_data for user space data info
292 * @data_type: The data type of the @dst_data. Must match with @src_data.type
293 * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
294 * @min_len: Initial length of user data structure for backward compatibility.
295 * This should be offsetofend using the last member in the user data
296 * struct that was initially added to include/uapi/linux/iommufd.h
298 static inline int __iommu_copy_struct_from_user(
299 void *dst_data, const struct iommu_user_data *src_data,
300 unsigned int data_type, size_t data_len, size_t min_len)
302 if (src_data->type != data_type)
304 if (WARN_ON(!dst_data || !src_data))
306 if (src_data->len < min_len || data_len < src_data->len)
308 return copy_struct_from_user(dst_data, data_len, src_data->uptr,
313 * iommu_copy_struct_from_user - Copy iommu driver specific user space data
314 * @kdst: Pointer to an iommu driver specific user data that is defined in
315 * include/uapi/linux/iommufd.h
316 * @user_data: Pointer to a struct iommu_user_data for user space data info
317 * @data_type: The data type of the @kdst. Must match with @user_data->type
318 * @min_last: The last memember of the data structure @kdst points in the
320 * Return 0 for success, otherwise -error.
322 #define iommu_copy_struct_from_user(kdst, user_data, data_type, min_last) \
323 __iommu_copy_struct_from_user(kdst, user_data, data_type, \
325 offsetofend(typeof(*kdst), min_last))
328 * struct iommu_ops - iommu ops and capabilities
329 * @capable: check capability
330 * @hw_info: report iommu hardware information. The data buffer returned by this
331 * op is allocated in the iommu driver and freed by the caller after
332 * use. The information type is one of enum iommu_hw_info_type defined
333 * in include/uapi/linux/iommufd.h.
334 * @domain_alloc: allocate and return an iommu domain if success. Otherwise
335 * NULL is returned. The domain is not fully initialized until
336 * the caller iommu_domain_alloc() returns.
337 * @domain_alloc_user: Allocate an iommu domain corresponding to the input
338 * parameters as defined in include/uapi/linux/iommufd.h.
339 * Unlike @domain_alloc, it is called only by IOMMUFD and
340 * must fully initialize the new domain before return.
341 * Upon success, if the @user_data is valid and the @parent
342 * points to a kernel-managed domain, the new domain must be
343 * IOMMU_DOMAIN_NESTED type; otherwise, the @parent must be
344 * NULL while the @user_data can be optionally provided, the
345 * new domain must support __IOMMU_DOMAIN_PAGING.
346 * Upon failure, ERR_PTR must be returned.
347 * @domain_alloc_paging: Allocate an iommu_domain that can be used for
348 * UNMANAGED, DMA, and DMA_FQ domain types.
349 * @probe_device: Add device to iommu driver handling
350 * @release_device: Remove device from iommu driver handling
351 * @probe_finalize: Do final setup work after the device is added to an IOMMU
352 * group and attached to the groups domain
353 * @device_group: find iommu group for a particular device
354 * @get_resv_regions: Request list of reserved regions for a device
355 * @of_xlate: add OF master IDs to iommu grouping
356 * @is_attach_deferred: Check if domain attach should be deferred from iommu
357 * driver init to device driver init (default no)
358 * @dev_enable/disable_feat: per device entries to enable/disable
359 * iommu specific features.
360 * @page_response: handle page request response
361 * @def_domain_type: device default domain type, return value:
362 * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
363 * - IOMMU_DOMAIN_DMA: must use a dma domain
364 * - 0: use the default setting
365 * @default_domain_ops: the default ops for domains
366 * @remove_dev_pasid: Remove any translation configurations of a specific
367 * pasid, so that any DMA transactions with this pasid
368 * will be blocked by the hardware.
369 * @pgsize_bitmap: bitmap of all possible supported page sizes
370 * @owner: Driver module providing these ops
371 * @identity_domain: An always available, always attachable identity
373 * @blocked_domain: An always available, always attachable blocking
375 * @default_domain: If not NULL this will always be set as the default domain.
376 * This should be an IDENTITY/BLOCKED/PLATFORM domain.
377 * Do not use in new drivers.
380 bool (*capable)(struct device *dev, enum iommu_cap);
381 void *(*hw_info)(struct device *dev, u32 *length, u32 *type);
383 /* Domain allocation and freeing by the iommu driver */
384 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
385 struct iommu_domain *(*domain_alloc_user)(
386 struct device *dev, u32 flags, struct iommu_domain *parent,
387 const struct iommu_user_data *user_data);
388 struct iommu_domain *(*domain_alloc_paging)(struct device *dev);
390 struct iommu_device *(*probe_device)(struct device *dev);
391 void (*release_device)(struct device *dev);
392 void (*probe_finalize)(struct device *dev);
393 struct iommu_group *(*device_group)(struct device *dev);
395 /* Request/Free a list of reserved regions for a device */
396 void (*get_resv_regions)(struct device *dev, struct list_head *list);
398 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
399 bool (*is_attach_deferred)(struct device *dev);
401 /* Per device IOMMU features */
402 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
403 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
405 int (*page_response)(struct device *dev,
406 struct iommu_fault_event *evt,
407 struct iommu_page_response *msg);
409 int (*def_domain_type)(struct device *dev);
410 void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
412 const struct iommu_domain_ops *default_domain_ops;
413 unsigned long pgsize_bitmap;
414 struct module *owner;
415 struct iommu_domain *identity_domain;
416 struct iommu_domain *blocked_domain;
417 struct iommu_domain *default_domain;
421 * struct iommu_domain_ops - domain specific operations
422 * @attach_dev: attach an iommu domain to a device
425 * * EINVAL - can indicate that device and domain are incompatible due to
426 * some previous configuration of the domain, in which case the
427 * driver shouldn't log an error, since it is legitimate for a
428 * caller to test reuse of existing domains. Otherwise, it may
429 * still represent some other fundamental problem
430 * * ENOMEM - out of memory
431 * * ENOSPC - non-ENOMEM type of resource allocation failures
432 * * EBUSY - device is attached to a domain and cannot be changed
433 * * ENODEV - device specific errors, not able to be attached
434 * * <others> - treated as ENODEV by the caller. Use is discouraged
435 * @set_dev_pasid: set an iommu domain to a pasid of device
436 * @map_pages: map a physically contiguous set of pages of the same size to
438 * @unmap_pages: unmap a number of pages of the same size from an iommu domain
439 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
440 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
441 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
443 * @iova_to_phys: translate iova to physical address
444 * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
445 * including no-snoop TLPs on PCIe or other platform
446 * specific mechanisms.
447 * @enable_nesting: Enable nesting
448 * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
449 * @free: Release the domain after use.
451 struct iommu_domain_ops {
452 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
453 int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
456 int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
457 phys_addr_t paddr, size_t pgsize, size_t pgcount,
458 int prot, gfp_t gfp, size_t *mapped);
459 size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
460 size_t pgsize, size_t pgcount,
461 struct iommu_iotlb_gather *iotlb_gather);
463 void (*flush_iotlb_all)(struct iommu_domain *domain);
464 int (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
466 void (*iotlb_sync)(struct iommu_domain *domain,
467 struct iommu_iotlb_gather *iotlb_gather);
469 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
472 bool (*enforce_cache_coherency)(struct iommu_domain *domain);
473 int (*enable_nesting)(struct iommu_domain *domain);
474 int (*set_pgtable_quirks)(struct iommu_domain *domain,
475 unsigned long quirks);
477 void (*free)(struct iommu_domain *domain);
481 * struct iommu_device - IOMMU core representation of one IOMMU hardware
483 * @list: Used by the iommu-core to keep a list of registered iommus
484 * @ops: iommu-ops for talking to this iommu
485 * @dev: struct device for sysfs handling
486 * @singleton_group: Used internally for drivers that have only one group
487 * @max_pasids: number of supported PASIDs
489 struct iommu_device {
490 struct list_head list;
491 const struct iommu_ops *ops;
492 struct fwnode_handle *fwnode;
494 struct iommu_group *singleton_group;
499 * struct iommu_fault_event - Generic fault event
501 * Can represent recoverable faults such as a page requests or
502 * unrecoverable faults such as DMA or IRQ remapping faults.
504 * @fault: fault descriptor
505 * @list: pending fault event list, used for tracking responses
507 struct iommu_fault_event {
508 struct iommu_fault fault;
509 struct list_head list;
513 * struct iommu_fault_param - per-device IOMMU fault data
514 * @handler: Callback function to handle IOMMU faults at device level
515 * @data: handler private data
516 * @faults: holds the pending faults which needs response
517 * @lock: protect pending faults list
519 struct iommu_fault_param {
520 iommu_dev_fault_handler_t handler;
522 struct list_head faults;
527 * struct dev_iommu - Collection of per-device IOMMU data
529 * @fault_param: IOMMU detected device fault reporting data
530 * @iopf_param: I/O Page Fault queue and data
531 * @fwspec: IOMMU fwspec data
532 * @iommu_dev: IOMMU device this device is linked to
533 * @priv: IOMMU Driver private data
534 * @max_pasids: number of PASIDs this device can consume
535 * @attach_deferred: the dma domain attachment is deferred
536 * @pci_32bit_workaround: Limit DMA allocations to 32-bit IOVAs
537 * @require_direct: device requires IOMMU_RESV_DIRECT regions
538 * @shadow_on_flush: IOTLB flushes are used to sync shadow tables
540 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
541 * struct iommu_group *iommu_group;
545 struct iommu_fault_param *fault_param;
546 struct iopf_device_param *iopf_param;
547 struct iommu_fwspec *fwspec;
548 struct iommu_device *iommu_dev;
551 u32 attach_deferred:1;
552 u32 pci_32bit_workaround:1;
553 u32 require_direct:1;
554 u32 shadow_on_flush:1;
557 int iommu_device_register(struct iommu_device *iommu,
558 const struct iommu_ops *ops,
559 struct device *hwdev);
560 void iommu_device_unregister(struct iommu_device *iommu);
561 int iommu_device_sysfs_add(struct iommu_device *iommu,
562 struct device *parent,
563 const struct attribute_group **groups,
564 const char *fmt, ...) __printf(4, 5);
565 void iommu_device_sysfs_remove(struct iommu_device *iommu);
566 int iommu_device_link(struct iommu_device *iommu, struct device *link);
567 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
568 int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
570 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
572 return (struct iommu_device *)dev_get_drvdata(dev);
575 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
577 *gather = (struct iommu_iotlb_gather) {
579 .freelist = LIST_HEAD_INIT(gather->freelist),
583 extern int bus_iommu_probe(const struct bus_type *bus);
584 extern bool iommu_present(const struct bus_type *bus);
585 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
586 extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
587 extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
588 extern void iommu_domain_free(struct iommu_domain *domain);
589 extern int iommu_attach_device(struct iommu_domain *domain,
591 extern void iommu_detach_device(struct iommu_domain *domain,
593 extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
594 struct device *dev, ioasid_t pasid);
595 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
596 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
597 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
598 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
599 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
601 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
602 unsigned long iova, size_t size,
603 struct iommu_iotlb_gather *iotlb_gather);
604 extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
605 struct scatterlist *sg, unsigned int nents,
606 int prot, gfp_t gfp);
607 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
608 extern void iommu_set_fault_handler(struct iommu_domain *domain,
609 iommu_fault_handler_t handler, void *token);
611 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
612 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
613 extern void iommu_set_default_passthrough(bool cmd_line);
614 extern void iommu_set_default_translated(bool cmd_line);
615 extern bool iommu_default_passthrough(void);
616 extern struct iommu_resv_region *
617 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
618 enum iommu_resv_type type, gfp_t gfp);
619 extern int iommu_get_group_resv_regions(struct iommu_group *group,
620 struct list_head *head);
622 extern int iommu_attach_group(struct iommu_domain *domain,
623 struct iommu_group *group);
624 extern void iommu_detach_group(struct iommu_domain *domain,
625 struct iommu_group *group);
626 extern struct iommu_group *iommu_group_alloc(void);
627 extern void *iommu_group_get_iommudata(struct iommu_group *group);
628 extern void iommu_group_set_iommudata(struct iommu_group *group,
630 void (*release)(void *iommu_data));
631 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
632 extern int iommu_group_add_device(struct iommu_group *group,
634 extern void iommu_group_remove_device(struct device *dev);
635 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
636 int (*fn)(struct device *, void *));
637 extern struct iommu_group *iommu_group_get(struct device *dev);
638 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
639 extern void iommu_group_put(struct iommu_group *group);
640 extern int iommu_register_device_fault_handler(struct device *dev,
641 iommu_dev_fault_handler_t handler,
644 extern int iommu_unregister_device_fault_handler(struct device *dev);
646 extern int iommu_report_device_fault(struct device *dev,
647 struct iommu_fault_event *evt);
648 extern int iommu_page_response(struct device *dev,
649 struct iommu_page_response *msg);
651 extern int iommu_group_id(struct iommu_group *group);
652 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
654 int iommu_enable_nesting(struct iommu_domain *domain);
655 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
656 unsigned long quirks);
658 void iommu_set_dma_strict(void);
660 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
661 unsigned long iova, int flags);
663 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
665 if (domain->ops->flush_iotlb_all)
666 domain->ops->flush_iotlb_all(domain);
669 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
670 struct iommu_iotlb_gather *iotlb_gather)
672 if (domain->ops->iotlb_sync)
673 domain->ops->iotlb_sync(domain, iotlb_gather);
675 iommu_iotlb_gather_init(iotlb_gather);
679 * iommu_iotlb_gather_is_disjoint - Checks whether a new range is disjoint
681 * @gather: TLB gather data
682 * @iova: start of page to invalidate
683 * @size: size of page to invalidate
685 * Helper for IOMMU drivers to check whether a new range and the gathered range
686 * are disjoint. For many IOMMUs, flushing the IOMMU in this case is better
687 * than merging the two, which might lead to unnecessary invalidations.
690 bool iommu_iotlb_gather_is_disjoint(struct iommu_iotlb_gather *gather,
691 unsigned long iova, size_t size)
693 unsigned long start = iova, end = start + size - 1;
695 return gather->end != 0 &&
696 (end + 1 < gather->start || start > gather->end + 1);
701 * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation
702 * @gather: TLB gather data
703 * @iova: start of page to invalidate
704 * @size: size of page to invalidate
706 * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands
707 * where only the address range matters, and simply minimising intermediate
708 * syncs is preferred.
710 static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather,
711 unsigned long iova, size_t size)
713 unsigned long end = iova + size - 1;
715 if (gather->start > iova)
716 gather->start = iova;
717 if (gather->end < end)
722 * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation
723 * @domain: IOMMU domain to be invalidated
724 * @gather: TLB gather data
725 * @iova: start of page to invalidate
726 * @size: size of page to invalidate
728 * Helper for IOMMU drivers to build invalidation commands based on individual
729 * pages, or with page size/table level hints which cannot be gathered if they
732 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
733 struct iommu_iotlb_gather *gather,
734 unsigned long iova, size_t size)
737 * If the new page is disjoint from the current range or is mapped at
738 * a different granularity, then sync the TLB so that the gather
739 * structure can be rewritten.
741 if ((gather->pgsize && gather->pgsize != size) ||
742 iommu_iotlb_gather_is_disjoint(gather, iova, size))
743 iommu_iotlb_sync(domain, gather);
745 gather->pgsize = size;
746 iommu_iotlb_gather_add_range(gather, iova, size);
749 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
751 return gather && gather->queued;
754 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
755 struct iova_bitmap *bitmap,
756 struct iommu_iotlb_gather *gather)
759 iommu_iotlb_gather_init(gather);
761 dirty->bitmap = bitmap;
762 dirty->gather = gather;
765 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
767 unsigned long length)
770 iova_bitmap_set(dirty->bitmap, iova, length);
773 iommu_iotlb_gather_add_range(dirty->gather, iova, length);
776 /* PCI device grouping function */
777 extern struct iommu_group *pci_device_group(struct device *dev);
778 /* Generic device grouping function */
779 extern struct iommu_group *generic_device_group(struct device *dev);
780 /* FSL-MC device grouping function */
781 struct iommu_group *fsl_mc_device_group(struct device *dev);
782 extern struct iommu_group *generic_single_device_group(struct device *dev);
785 * struct iommu_fwspec - per-device IOMMU instance data
786 * @ops: ops for this device's IOMMU
787 * @iommu_fwnode: firmware handle for this device's IOMMU
788 * @flags: IOMMU_FWSPEC_* flags
789 * @num_ids: number of associated device IDs
790 * @ids: IDs which this device may present to the IOMMU
792 * Note that the IDs (and any other information, really) stored in this structure should be
793 * considered private to the IOMMU device driver and are not to be used directly by IOMMU
796 struct iommu_fwspec {
797 const struct iommu_ops *ops;
798 struct fwnode_handle *iommu_fwnode;
800 unsigned int num_ids;
804 /* ATS is supported */
805 #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
808 * struct iommu_sva - handle to a device-mm bond
812 struct iommu_domain *domain;
815 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
816 const struct iommu_ops *ops);
817 void iommu_fwspec_free(struct device *dev);
818 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
819 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
821 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
824 return dev->iommu->fwspec;
829 static inline void dev_iommu_fwspec_set(struct device *dev,
830 struct iommu_fwspec *fwspec)
832 dev->iommu->fwspec = fwspec;
835 static inline void *dev_iommu_priv_get(struct device *dev)
838 return dev->iommu->priv;
843 static inline void dev_iommu_priv_set(struct device *dev, void *priv)
845 dev->iommu->priv = priv;
848 int iommu_probe_device(struct device *dev);
850 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
851 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
853 int iommu_device_use_default_domain(struct device *dev);
854 void iommu_device_unuse_default_domain(struct device *dev);
856 int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
857 void iommu_group_release_dma_owner(struct iommu_group *group);
858 bool iommu_group_dma_owner_claimed(struct iommu_group *group);
860 int iommu_device_claim_dma_owner(struct device *dev, void *owner);
861 void iommu_device_release_dma_owner(struct device *dev);
863 struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
864 struct mm_struct *mm);
865 int iommu_attach_device_pasid(struct iommu_domain *domain,
866 struct device *dev, ioasid_t pasid);
867 void iommu_detach_device_pasid(struct iommu_domain *domain,
868 struct device *dev, ioasid_t pasid);
869 struct iommu_domain *
870 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
872 ioasid_t iommu_alloc_global_pasid(struct device *dev);
873 void iommu_free_global_pasid(ioasid_t pasid);
874 #else /* CONFIG_IOMMU_API */
877 struct iommu_group {};
878 struct iommu_fwspec {};
879 struct iommu_device {};
880 struct iommu_fault_param {};
881 struct iommu_iotlb_gather {};
882 struct iommu_dirty_bitmap {};
883 struct iommu_dirty_ops {};
885 static inline bool iommu_present(const struct bus_type *bus)
890 static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
895 static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
900 static inline void iommu_domain_free(struct iommu_domain *domain)
904 static inline int iommu_attach_device(struct iommu_domain *domain,
910 static inline void iommu_detach_device(struct iommu_domain *domain,
915 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
920 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
921 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
926 static inline size_t iommu_unmap(struct iommu_domain *domain,
927 unsigned long iova, size_t size)
932 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
933 unsigned long iova, int gfp_order,
934 struct iommu_iotlb_gather *iotlb_gather)
939 static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
940 unsigned long iova, struct scatterlist *sg,
941 unsigned int nents, int prot, gfp_t gfp)
946 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
950 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
951 struct iommu_iotlb_gather *iotlb_gather)
955 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
960 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
961 iommu_fault_handler_t handler, void *token)
965 static inline void iommu_get_resv_regions(struct device *dev,
966 struct list_head *list)
970 static inline void iommu_put_resv_regions(struct device *dev,
971 struct list_head *list)
975 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
976 struct list_head *head)
981 static inline void iommu_set_default_passthrough(bool cmd_line)
985 static inline void iommu_set_default_translated(bool cmd_line)
989 static inline bool iommu_default_passthrough(void)
994 static inline int iommu_attach_group(struct iommu_domain *domain,
995 struct iommu_group *group)
1000 static inline void iommu_detach_group(struct iommu_domain *domain,
1001 struct iommu_group *group)
1005 static inline struct iommu_group *iommu_group_alloc(void)
1007 return ERR_PTR(-ENODEV);
1010 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
1015 static inline void iommu_group_set_iommudata(struct iommu_group *group,
1017 void (*release)(void *iommu_data))
1021 static inline int iommu_group_set_name(struct iommu_group *group,
1027 static inline int iommu_group_add_device(struct iommu_group *group,
1033 static inline void iommu_group_remove_device(struct device *dev)
1037 static inline int iommu_group_for_each_dev(struct iommu_group *group,
1039 int (*fn)(struct device *, void *))
1044 static inline struct iommu_group *iommu_group_get(struct device *dev)
1049 static inline void iommu_group_put(struct iommu_group *group)
1054 int iommu_register_device_fault_handler(struct device *dev,
1055 iommu_dev_fault_handler_t handler,
1061 static inline int iommu_unregister_device_fault_handler(struct device *dev)
1067 int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
1072 static inline int iommu_page_response(struct device *dev,
1073 struct iommu_page_response *msg)
1078 static inline int iommu_group_id(struct iommu_group *group)
1083 static inline int iommu_set_pgtable_quirks(struct iommu_domain *domain,
1084 unsigned long quirks)
1089 static inline int iommu_device_register(struct iommu_device *iommu,
1090 const struct iommu_ops *ops,
1091 struct device *hwdev)
1096 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
1101 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
1105 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
1106 struct iommu_iotlb_gather *gather,
1107 unsigned long iova, size_t size)
1111 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
1116 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
1117 struct iova_bitmap *bitmap,
1118 struct iommu_iotlb_gather *gather)
1122 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
1124 unsigned long length)
1128 static inline void iommu_device_unregister(struct iommu_device *iommu)
1132 static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
1133 struct device *parent,
1134 const struct attribute_group **groups,
1135 const char *fmt, ...)
1140 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
1144 static inline int iommu_device_link(struct device *dev, struct device *link)
1149 static inline void iommu_device_unlink(struct device *dev, struct device *link)
1153 static inline int iommu_fwspec_init(struct device *dev,
1154 struct fwnode_handle *iommu_fwnode,
1155 const struct iommu_ops *ops)
1160 static inline void iommu_fwspec_free(struct device *dev)
1164 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
1171 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
1177 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
1183 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1188 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1193 static inline int iommu_device_use_default_domain(struct device *dev)
1198 static inline void iommu_device_unuse_default_domain(struct device *dev)
1203 iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
1208 static inline void iommu_group_release_dma_owner(struct iommu_group *group)
1212 static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
1217 static inline void iommu_device_release_dma_owner(struct device *dev)
1221 static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
1226 static inline struct iommu_domain *
1227 iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
1232 static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
1233 struct device *dev, ioasid_t pasid)
1238 static inline void iommu_detach_device_pasid(struct iommu_domain *domain,
1239 struct device *dev, ioasid_t pasid)
1243 static inline struct iommu_domain *
1244 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
1250 static inline ioasid_t iommu_alloc_global_pasid(struct device *dev)
1252 return IOMMU_PASID_INVALID;
1255 static inline void iommu_free_global_pasid(ioasid_t pasid) {}
1256 #endif /* CONFIG_IOMMU_API */
1259 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1260 * @domain: The IOMMU domain to perform the mapping
1261 * @iova: The start address to map the buffer
1262 * @sgt: The sg_table object describing the buffer
1263 * @prot: IOMMU protection bits
1265 * Creates a mapping at @iova for the buffer described by a scatterlist
1266 * stored in the given sg_table object in the provided IOMMU domain.
1268 static inline ssize_t iommu_map_sgtable(struct iommu_domain *domain,
1269 unsigned long iova, struct sg_table *sgt, int prot)
1271 return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,
1275 #ifdef CONFIG_IOMMU_DEBUGFS
1276 extern struct dentry *iommu_debugfs_dir;
1277 void iommu_debugfs_setup(void);
1279 static inline void iommu_debugfs_setup(void) {}
1282 #ifdef CONFIG_IOMMU_DMA
1283 #include <linux/msi.h>
1285 /* Setup call for arch DMA mapping code */
1286 void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
1288 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
1290 int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
1291 void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg);
1293 #else /* CONFIG_IOMMU_DMA */
1298 static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
1302 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
1307 static inline int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
1312 static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
1316 #endif /* CONFIG_IOMMU_DMA */
1319 * Newer generations of Tegra SoCs require devices' stream IDs to be directly programmed into
1320 * some registers. These are always paired with a Tegra SMMU or ARM SMMU, for which the contents
1321 * of the struct iommu_fwspec are known. Use this helper to formalize access to these internals.
1323 #define TEGRA_STREAM_ID_BYPASS 0x7f
1325 static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream_id)
1327 #ifdef CONFIG_IOMMU_API
1328 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1330 if (fwspec && fwspec->num_ids == 1) {
1331 *stream_id = fwspec->ids[0] & 0xffff;
1339 #ifdef CONFIG_IOMMU_SVA
1340 static inline void mm_pasid_init(struct mm_struct *mm)
1342 mm->pasid = IOMMU_PASID_INVALID;
1344 static inline bool mm_valid_pasid(struct mm_struct *mm)
1346 return mm->pasid != IOMMU_PASID_INVALID;
1348 void mm_pasid_drop(struct mm_struct *mm);
1349 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
1350 struct mm_struct *mm);
1351 void iommu_sva_unbind_device(struct iommu_sva *handle);
1352 u32 iommu_sva_get_pasid(struct iommu_sva *handle);
1354 static inline struct iommu_sva *
1355 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
1360 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1364 static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1366 return IOMMU_PASID_INVALID;
1368 static inline void mm_pasid_init(struct mm_struct *mm) {}
1369 static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
1370 static inline void mm_pasid_drop(struct mm_struct *mm) {}
1371 #endif /* CONFIG_IOMMU_SVA */
1373 #endif /* __LINUX_IOMMU_H */