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 <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 */
70 #define __IOMMU_DOMAIN_NESTED (1U << 6) /* User-managed address space nested
71 on a stage-2 translation */
73 #define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ
75 * This are the possible domain-types
77 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
79 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
80 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
82 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
83 * This flag allows IOMMU drivers to implement
84 * certain optimizations for these domains
85 * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB
87 * IOMMU_DOMAIN_SVA - DMA addresses are shared process addresses
88 * represented by mm_struct's.
90 #define IOMMU_DOMAIN_BLOCKED (0U)
91 #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
92 #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
93 #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
94 __IOMMU_DOMAIN_DMA_API)
95 #define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \
96 __IOMMU_DOMAIN_DMA_API | \
97 __IOMMU_DOMAIN_DMA_FQ)
98 #define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA)
99 #define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED)
101 struct iommu_domain {
103 const struct iommu_domain_ops *ops;
104 const struct iommu_dirty_ops *dirty_ops;
106 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
107 struct iommu_domain_geometry geometry;
108 struct iommu_dma_cookie *iova_cookie;
109 enum iommu_page_response_code (*iopf_handler)(struct iommu_fault *fault,
114 iommu_fault_handler_t handler;
117 struct { /* IOMMU_DOMAIN_SVA */
118 struct mm_struct *mm;
124 static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
126 return domain->type & __IOMMU_DOMAIN_DMA_API;
130 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU_CACHE is supported */
131 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
132 IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
133 DMA protection and we should too */
135 * Per-device flag indicating if enforce_cache_coherency() will work on
138 IOMMU_CAP_ENFORCE_CACHE_COHERENCY,
140 * IOMMU driver does not issue TLB maintenance during .unmap, so can
141 * usefully support the non-strict DMA flush queue.
143 IOMMU_CAP_DEFERRED_FLUSH,
144 IOMMU_CAP_DIRTY_TRACKING, /* IOMMU supports dirty tracking */
147 /* These are the possible reserved region types */
148 enum iommu_resv_type {
149 /* Memory regions which must be mapped 1:1 at all times */
152 * Memory regions which are advertised to be 1:1 but are
153 * commonly considered relaxable in some conditions,
154 * for instance in device assignment use case (USB, Graphics)
156 IOMMU_RESV_DIRECT_RELAXABLE,
157 /* Arbitrary "never map this or give it to a device" address ranges */
159 /* Hardware MSI region (untranslated) */
161 /* Software-managed MSI translation window */
166 * struct iommu_resv_region - descriptor for a reserved memory region
167 * @list: Linked list pointers
168 * @start: System physical start address of the region
169 * @length: Length of the region in bytes
170 * @prot: IOMMU Protection flags (READ/WRITE/...)
171 * @type: Type of the reserved region
172 * @free: Callback to free associated memory allocations
174 struct iommu_resv_region {
175 struct list_head list;
179 enum iommu_resv_type type;
180 void (*free)(struct device *dev, struct iommu_resv_region *region);
183 struct iommu_iort_rmr_data {
184 struct iommu_resv_region rr;
186 /* Stream IDs associated with IORT RMR entry */
192 * enum iommu_dev_features - Per device IOMMU features
193 * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
194 * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
195 * enabling %IOMMU_DEV_FEAT_SVA requires
196 * %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
197 * Faults themselves instead of relying on the IOMMU. When
198 * supported, this feature must be enabled before and
199 * disabled after %IOMMU_DEV_FEAT_SVA.
201 * Device drivers enable a feature using iommu_dev_enable_feature().
203 enum iommu_dev_features {
208 #define IOMMU_NO_PASID (0U) /* Reserved for DMA w/o PASID */
209 #define IOMMU_FIRST_GLOBAL_PASID (1U) /*starting range for allocation */
210 #define IOMMU_PASID_INVALID (-1U)
211 typedef unsigned int ioasid_t;
213 #ifdef CONFIG_IOMMU_API
216 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
218 * @start: IOVA representing the start of the range to be flushed
219 * @end: IOVA representing the end of the range to be flushed (inclusive)
220 * @pgsize: The interval at which to perform the flush
221 * @freelist: Removed pages to free after sync
222 * @queued: Indicates that the flush will be queued
224 * This structure is intended to be updated by multiple calls to the
225 * ->unmap() function in struct iommu_ops before eventually being passed
226 * into ->iotlb_sync(). Drivers can add pages to @freelist to be freed after
227 * ->iotlb_sync() or ->iotlb_flush_all() have cleared all cached references to
228 * them. @queued is set to indicate when ->iotlb_flush_all() will be called
229 * later instead of ->iotlb_sync(), so drivers may optimise accordingly.
231 struct iommu_iotlb_gather {
235 struct list_head freelist;
240 * struct iommu_dirty_bitmap - Dirty IOVA bitmap state
241 * @bitmap: IOVA bitmap
242 * @gather: Range information for a pending IOTLB flush
244 struct iommu_dirty_bitmap {
245 struct iova_bitmap *bitmap;
246 struct iommu_iotlb_gather *gather;
249 /* Read but do not clear any dirty bits */
250 #define IOMMU_DIRTY_NO_CLEAR (1 << 0)
253 * struct iommu_dirty_ops - domain specific dirty tracking operations
254 * @set_dirty_tracking: Enable or Disable dirty tracking on the iommu domain
255 * @read_and_clear_dirty: Walk IOMMU page tables for dirtied PTEs marshalled
256 * into a bitmap, with a bit represented as a page.
257 * Reads the dirty PTE bits and clears it from IO
260 struct iommu_dirty_ops {
261 int (*set_dirty_tracking)(struct iommu_domain *domain, bool enabled);
262 int (*read_and_clear_dirty)(struct iommu_domain *domain,
263 unsigned long iova, size_t size,
265 struct iommu_dirty_bitmap *dirty);
269 * struct iommu_user_data - iommu driver specific user space data info
270 * @type: The data type of the user buffer
271 * @uptr: Pointer to the user buffer for copy_from_user()
272 * @len: The length of the user buffer in bytes
274 * A user space data is an uAPI that is defined in include/uapi/linux/iommufd.h
275 * @type, @uptr and @len should be just copied from an iommufd core uAPI struct.
277 struct iommu_user_data {
284 * __iommu_copy_struct_from_user - Copy iommu driver specific user space data
285 * @dst_data: Pointer to an iommu driver specific user data that is defined in
286 * include/uapi/linux/iommufd.h
287 * @src_data: Pointer to a struct iommu_user_data for user space data info
288 * @data_type: The data type of the @dst_data. Must match with @src_data.type
289 * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
290 * @min_len: Initial length of user data structure for backward compatibility.
291 * This should be offsetofend using the last member in the user data
292 * struct that was initially added to include/uapi/linux/iommufd.h
294 static inline int __iommu_copy_struct_from_user(
295 void *dst_data, const struct iommu_user_data *src_data,
296 unsigned int data_type, size_t data_len, size_t min_len)
298 if (src_data->type != data_type)
300 if (WARN_ON(!dst_data || !src_data))
302 if (src_data->len < min_len || data_len < src_data->len)
304 return copy_struct_from_user(dst_data, data_len, src_data->uptr,
309 * iommu_copy_struct_from_user - Copy iommu driver specific user space data
310 * @kdst: Pointer to an iommu driver specific user data that is defined in
311 * include/uapi/linux/iommufd.h
312 * @user_data: Pointer to a struct iommu_user_data for user space data info
313 * @data_type: The data type of the @kdst. Must match with @user_data->type
314 * @min_last: The last memember of the data structure @kdst points in the
316 * Return 0 for success, otherwise -error.
318 #define iommu_copy_struct_from_user(kdst, user_data, data_type, min_last) \
319 __iommu_copy_struct_from_user(kdst, user_data, data_type, \
321 offsetofend(typeof(*kdst), min_last))
324 * struct iommu_ops - iommu ops and capabilities
325 * @capable: check capability
326 * @hw_info: report iommu hardware information. The data buffer returned by this
327 * op is allocated in the iommu driver and freed by the caller after
328 * use. The information type is one of enum iommu_hw_info_type defined
329 * in include/uapi/linux/iommufd.h.
330 * @domain_alloc: allocate and return an iommu domain if success. Otherwise
331 * NULL is returned. The domain is not fully initialized until
332 * the caller iommu_domain_alloc() returns.
333 * @domain_alloc_user: Allocate an iommu domain corresponding to the input
334 * parameters as defined in include/uapi/linux/iommufd.h.
335 * Unlike @domain_alloc, it is called only by IOMMUFD and
336 * must fully initialize the new domain before return.
337 * Upon success, if the @user_data is valid and the @parent
338 * points to a kernel-managed domain, the new domain must be
339 * IOMMU_DOMAIN_NESTED type; otherwise, the @parent must be
340 * NULL while the @user_data can be optionally provided, the
341 * new domain must support __IOMMU_DOMAIN_PAGING.
342 * Upon failure, ERR_PTR must be returned.
343 * @probe_device: Add device to iommu driver handling
344 * @release_device: Remove device from iommu driver handling
345 * @probe_finalize: Do final setup work after the device is added to an IOMMU
346 * group and attached to the groups domain
347 * @set_platform_dma_ops: Returning control back to the platform DMA ops. This op
348 * is to support old IOMMU drivers, new drivers should use
349 * default domains, and the common IOMMU DMA ops.
350 * @device_group: find iommu group for a particular device
351 * @get_resv_regions: Request list of reserved regions for a device
352 * @of_xlate: add OF master IDs to iommu grouping
353 * @is_attach_deferred: Check if domain attach should be deferred from iommu
354 * driver init to device driver init (default no)
355 * @dev_enable/disable_feat: per device entries to enable/disable
356 * iommu specific features.
357 * @page_response: handle page request response
358 * @def_domain_type: device default domain type, return value:
359 * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
360 * - IOMMU_DOMAIN_DMA: must use a dma domain
361 * - 0: use the default setting
362 * @default_domain_ops: the default ops for domains
363 * @remove_dev_pasid: Remove any translation configurations of a specific
364 * pasid, so that any DMA transactions with this pasid
365 * will be blocked by the hardware.
366 * @pgsize_bitmap: bitmap of all possible supported page sizes
367 * @owner: Driver module providing these ops
370 bool (*capable)(struct device *dev, enum iommu_cap);
371 void *(*hw_info)(struct device *dev, u32 *length, u32 *type);
373 /* Domain allocation and freeing by the iommu driver */
374 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
375 struct iommu_domain *(*domain_alloc_user)(
376 struct device *dev, u32 flags, struct iommu_domain *parent,
377 const struct iommu_user_data *user_data);
379 struct iommu_device *(*probe_device)(struct device *dev);
380 void (*release_device)(struct device *dev);
381 void (*probe_finalize)(struct device *dev);
382 void (*set_platform_dma_ops)(struct device *dev);
383 struct iommu_group *(*device_group)(struct device *dev);
385 /* Request/Free a list of reserved regions for a device */
386 void (*get_resv_regions)(struct device *dev, struct list_head *list);
388 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
389 bool (*is_attach_deferred)(struct device *dev);
391 /* Per device IOMMU features */
392 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
393 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
395 int (*page_response)(struct device *dev,
396 struct iommu_fault_event *evt,
397 struct iommu_page_response *msg);
399 int (*def_domain_type)(struct device *dev);
400 void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
402 const struct iommu_domain_ops *default_domain_ops;
403 unsigned long pgsize_bitmap;
404 struct module *owner;
408 * struct iommu_domain_ops - domain specific operations
409 * @attach_dev: attach an iommu domain to a device
412 * * EINVAL - can indicate that device and domain are incompatible due to
413 * some previous configuration of the domain, in which case the
414 * driver shouldn't log an error, since it is legitimate for a
415 * caller to test reuse of existing domains. Otherwise, it may
416 * still represent some other fundamental problem
417 * * ENOMEM - out of memory
418 * * ENOSPC - non-ENOMEM type of resource allocation failures
419 * * EBUSY - device is attached to a domain and cannot be changed
420 * * ENODEV - device specific errors, not able to be attached
421 * * <others> - treated as ENODEV by the caller. Use is discouraged
422 * @set_dev_pasid: set an iommu domain to a pasid of device
423 * @map: map a physically contiguous memory region to an iommu domain
424 * @map_pages: map a physically contiguous set of pages of the same size to
426 * @unmap: unmap a physically contiguous memory region from an iommu domain
427 * @unmap_pages: unmap a number of pages of the same size from an iommu domain
428 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
429 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
430 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
432 * @iova_to_phys: translate iova to physical address
433 * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
434 * including no-snoop TLPs on PCIe or other platform
435 * specific mechanisms.
436 * @enable_nesting: Enable nesting
437 * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
438 * @free: Release the domain after use.
440 struct iommu_domain_ops {
441 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
442 int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
445 int (*map)(struct iommu_domain *domain, unsigned long iova,
446 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
447 int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
448 phys_addr_t paddr, size_t pgsize, size_t pgcount,
449 int prot, gfp_t gfp, size_t *mapped);
450 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
451 size_t size, struct iommu_iotlb_gather *iotlb_gather);
452 size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
453 size_t pgsize, size_t pgcount,
454 struct iommu_iotlb_gather *iotlb_gather);
456 void (*flush_iotlb_all)(struct iommu_domain *domain);
457 void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
459 void (*iotlb_sync)(struct iommu_domain *domain,
460 struct iommu_iotlb_gather *iotlb_gather);
462 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
465 bool (*enforce_cache_coherency)(struct iommu_domain *domain);
466 int (*enable_nesting)(struct iommu_domain *domain);
467 int (*set_pgtable_quirks)(struct iommu_domain *domain,
468 unsigned long quirks);
470 void (*free)(struct iommu_domain *domain);
474 * struct iommu_device - IOMMU core representation of one IOMMU hardware
476 * @list: Used by the iommu-core to keep a list of registered iommus
477 * @ops: iommu-ops for talking to this iommu
478 * @dev: struct device for sysfs handling
479 * @max_pasids: number of supported PASIDs
481 struct iommu_device {
482 struct list_head list;
483 const struct iommu_ops *ops;
484 struct fwnode_handle *fwnode;
490 * struct iommu_fault_event - Generic fault event
492 * Can represent recoverable faults such as a page requests or
493 * unrecoverable faults such as DMA or IRQ remapping faults.
495 * @fault: fault descriptor
496 * @list: pending fault event list, used for tracking responses
498 struct iommu_fault_event {
499 struct iommu_fault fault;
500 struct list_head list;
504 * struct iommu_fault_param - per-device IOMMU fault data
505 * @handler: Callback function to handle IOMMU faults at device level
506 * @data: handler private data
507 * @faults: holds the pending faults which needs response
508 * @lock: protect pending faults list
510 struct iommu_fault_param {
511 iommu_dev_fault_handler_t handler;
513 struct list_head faults;
518 * struct dev_iommu - Collection of per-device IOMMU data
520 * @fault_param: IOMMU detected device fault reporting data
521 * @iopf_param: I/O Page Fault queue and data
522 * @fwspec: IOMMU fwspec data
523 * @iommu_dev: IOMMU device this device is linked to
524 * @priv: IOMMU Driver private data
525 * @max_pasids: number of PASIDs this device can consume
526 * @attach_deferred: the dma domain attachment is deferred
527 * @pci_32bit_workaround: Limit DMA allocations to 32-bit IOVAs
528 * @require_direct: device requires IOMMU_RESV_DIRECT regions
530 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
531 * struct iommu_group *iommu_group;
535 struct iommu_fault_param *fault_param;
536 struct iopf_device_param *iopf_param;
537 struct iommu_fwspec *fwspec;
538 struct iommu_device *iommu_dev;
541 u32 attach_deferred:1;
542 u32 pci_32bit_workaround:1;
543 u32 require_direct:1;
546 int iommu_device_register(struct iommu_device *iommu,
547 const struct iommu_ops *ops,
548 struct device *hwdev);
549 void iommu_device_unregister(struct iommu_device *iommu);
550 int iommu_device_sysfs_add(struct iommu_device *iommu,
551 struct device *parent,
552 const struct attribute_group **groups,
553 const char *fmt, ...) __printf(4, 5);
554 void iommu_device_sysfs_remove(struct iommu_device *iommu);
555 int iommu_device_link(struct iommu_device *iommu, struct device *link);
556 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
557 int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
559 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
561 return (struct iommu_device *)dev_get_drvdata(dev);
564 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
566 *gather = (struct iommu_iotlb_gather) {
568 .freelist = LIST_HEAD_INIT(gather->freelist),
572 extern int bus_iommu_probe(const struct bus_type *bus);
573 extern bool iommu_present(const struct bus_type *bus);
574 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
575 extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
576 extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
577 extern void iommu_domain_free(struct iommu_domain *domain);
578 extern int iommu_attach_device(struct iommu_domain *domain,
580 extern void iommu_detach_device(struct iommu_domain *domain,
582 extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
583 struct device *dev, ioasid_t pasid);
584 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
585 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
586 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
587 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
588 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
590 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
591 unsigned long iova, size_t size,
592 struct iommu_iotlb_gather *iotlb_gather);
593 extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
594 struct scatterlist *sg, unsigned int nents,
595 int prot, gfp_t gfp);
596 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
597 extern void iommu_set_fault_handler(struct iommu_domain *domain,
598 iommu_fault_handler_t handler, void *token);
600 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
601 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
602 extern void iommu_set_default_passthrough(bool cmd_line);
603 extern void iommu_set_default_translated(bool cmd_line);
604 extern bool iommu_default_passthrough(void);
605 extern struct iommu_resv_region *
606 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
607 enum iommu_resv_type type, gfp_t gfp);
608 extern int iommu_get_group_resv_regions(struct iommu_group *group,
609 struct list_head *head);
611 extern int iommu_attach_group(struct iommu_domain *domain,
612 struct iommu_group *group);
613 extern void iommu_detach_group(struct iommu_domain *domain,
614 struct iommu_group *group);
615 extern struct iommu_group *iommu_group_alloc(void);
616 extern void *iommu_group_get_iommudata(struct iommu_group *group);
617 extern void iommu_group_set_iommudata(struct iommu_group *group,
619 void (*release)(void *iommu_data));
620 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
621 extern int iommu_group_add_device(struct iommu_group *group,
623 extern void iommu_group_remove_device(struct device *dev);
624 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
625 int (*fn)(struct device *, void *));
626 extern struct iommu_group *iommu_group_get(struct device *dev);
627 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
628 extern void iommu_group_put(struct iommu_group *group);
629 extern int iommu_register_device_fault_handler(struct device *dev,
630 iommu_dev_fault_handler_t handler,
633 extern int iommu_unregister_device_fault_handler(struct device *dev);
635 extern int iommu_report_device_fault(struct device *dev,
636 struct iommu_fault_event *evt);
637 extern int iommu_page_response(struct device *dev,
638 struct iommu_page_response *msg);
640 extern int iommu_group_id(struct iommu_group *group);
641 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
643 int iommu_enable_nesting(struct iommu_domain *domain);
644 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
645 unsigned long quirks);
647 void iommu_set_dma_strict(void);
649 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
650 unsigned long iova, int flags);
652 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
654 if (domain->ops->flush_iotlb_all)
655 domain->ops->flush_iotlb_all(domain);
658 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
659 struct iommu_iotlb_gather *iotlb_gather)
661 if (domain->ops->iotlb_sync)
662 domain->ops->iotlb_sync(domain, iotlb_gather);
664 iommu_iotlb_gather_init(iotlb_gather);
668 * iommu_iotlb_gather_is_disjoint - Checks whether a new range is disjoint
670 * @gather: TLB gather data
671 * @iova: start of page to invalidate
672 * @size: size of page to invalidate
674 * Helper for IOMMU drivers to check whether a new range and the gathered range
675 * are disjoint. For many IOMMUs, flushing the IOMMU in this case is better
676 * than merging the two, which might lead to unnecessary invalidations.
679 bool iommu_iotlb_gather_is_disjoint(struct iommu_iotlb_gather *gather,
680 unsigned long iova, size_t size)
682 unsigned long start = iova, end = start + size - 1;
684 return gather->end != 0 &&
685 (end + 1 < gather->start || start > gather->end + 1);
690 * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation
691 * @gather: TLB gather data
692 * @iova: start of page to invalidate
693 * @size: size of page to invalidate
695 * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands
696 * where only the address range matters, and simply minimising intermediate
697 * syncs is preferred.
699 static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather,
700 unsigned long iova, size_t size)
702 unsigned long end = iova + size - 1;
704 if (gather->start > iova)
705 gather->start = iova;
706 if (gather->end < end)
711 * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation
712 * @domain: IOMMU domain to be invalidated
713 * @gather: TLB gather data
714 * @iova: start of page to invalidate
715 * @size: size of page to invalidate
717 * Helper for IOMMU drivers to build invalidation commands based on individual
718 * pages, or with page size/table level hints which cannot be gathered if they
721 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
722 struct iommu_iotlb_gather *gather,
723 unsigned long iova, size_t size)
726 * If the new page is disjoint from the current range or is mapped at
727 * a different granularity, then sync the TLB so that the gather
728 * structure can be rewritten.
730 if ((gather->pgsize && gather->pgsize != size) ||
731 iommu_iotlb_gather_is_disjoint(gather, iova, size))
732 iommu_iotlb_sync(domain, gather);
734 gather->pgsize = size;
735 iommu_iotlb_gather_add_range(gather, iova, size);
738 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
740 return gather && gather->queued;
743 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
744 struct iova_bitmap *bitmap,
745 struct iommu_iotlb_gather *gather)
748 iommu_iotlb_gather_init(gather);
750 dirty->bitmap = bitmap;
751 dirty->gather = gather;
754 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
756 unsigned long length)
759 iova_bitmap_set(dirty->bitmap, iova, length);
762 iommu_iotlb_gather_add_range(dirty->gather, iova, length);
765 /* PCI device grouping function */
766 extern struct iommu_group *pci_device_group(struct device *dev);
767 /* Generic device grouping function */
768 extern struct iommu_group *generic_device_group(struct device *dev);
769 /* FSL-MC device grouping function */
770 struct iommu_group *fsl_mc_device_group(struct device *dev);
773 * struct iommu_fwspec - per-device IOMMU instance data
774 * @ops: ops for this device's IOMMU
775 * @iommu_fwnode: firmware handle for this device's IOMMU
776 * @flags: IOMMU_FWSPEC_* flags
777 * @num_ids: number of associated device IDs
778 * @ids: IDs which this device may present to the IOMMU
780 * Note that the IDs (and any other information, really) stored in this structure should be
781 * considered private to the IOMMU device driver and are not to be used directly by IOMMU
784 struct iommu_fwspec {
785 const struct iommu_ops *ops;
786 struct fwnode_handle *iommu_fwnode;
788 unsigned int num_ids;
792 /* ATS is supported */
793 #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
796 * struct iommu_sva - handle to a device-mm bond
800 struct iommu_domain *domain;
803 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
804 const struct iommu_ops *ops);
805 void iommu_fwspec_free(struct device *dev);
806 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
807 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
809 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
812 return dev->iommu->fwspec;
817 static inline void dev_iommu_fwspec_set(struct device *dev,
818 struct iommu_fwspec *fwspec)
820 dev->iommu->fwspec = fwspec;
823 static inline void *dev_iommu_priv_get(struct device *dev)
826 return dev->iommu->priv;
831 static inline void dev_iommu_priv_set(struct device *dev, void *priv)
833 dev->iommu->priv = priv;
836 int iommu_probe_device(struct device *dev);
838 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
839 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
841 int iommu_device_use_default_domain(struct device *dev);
842 void iommu_device_unuse_default_domain(struct device *dev);
844 int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
845 void iommu_group_release_dma_owner(struct iommu_group *group);
846 bool iommu_group_dma_owner_claimed(struct iommu_group *group);
848 int iommu_device_claim_dma_owner(struct device *dev, void *owner);
849 void iommu_device_release_dma_owner(struct device *dev);
851 struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
852 struct mm_struct *mm);
853 int iommu_attach_device_pasid(struct iommu_domain *domain,
854 struct device *dev, ioasid_t pasid);
855 void iommu_detach_device_pasid(struct iommu_domain *domain,
856 struct device *dev, ioasid_t pasid);
857 struct iommu_domain *
858 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
860 ioasid_t iommu_alloc_global_pasid(struct device *dev);
861 void iommu_free_global_pasid(ioasid_t pasid);
862 #else /* CONFIG_IOMMU_API */
865 struct iommu_group {};
866 struct iommu_fwspec {};
867 struct iommu_device {};
868 struct iommu_fault_param {};
869 struct iommu_iotlb_gather {};
870 struct iommu_dirty_bitmap {};
871 struct iommu_dirty_ops {};
873 static inline bool iommu_present(const struct bus_type *bus)
878 static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
883 static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
888 static inline void iommu_domain_free(struct iommu_domain *domain)
892 static inline int iommu_attach_device(struct iommu_domain *domain,
898 static inline void iommu_detach_device(struct iommu_domain *domain,
903 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
908 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
909 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
914 static inline size_t iommu_unmap(struct iommu_domain *domain,
915 unsigned long iova, size_t size)
920 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
921 unsigned long iova, int gfp_order,
922 struct iommu_iotlb_gather *iotlb_gather)
927 static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
928 unsigned long iova, struct scatterlist *sg,
929 unsigned int nents, int prot, gfp_t gfp)
934 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
938 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
939 struct iommu_iotlb_gather *iotlb_gather)
943 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
948 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
949 iommu_fault_handler_t handler, void *token)
953 static inline void iommu_get_resv_regions(struct device *dev,
954 struct list_head *list)
958 static inline void iommu_put_resv_regions(struct device *dev,
959 struct list_head *list)
963 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
964 struct list_head *head)
969 static inline void iommu_set_default_passthrough(bool cmd_line)
973 static inline void iommu_set_default_translated(bool cmd_line)
977 static inline bool iommu_default_passthrough(void)
982 static inline int iommu_attach_group(struct iommu_domain *domain,
983 struct iommu_group *group)
988 static inline void iommu_detach_group(struct iommu_domain *domain,
989 struct iommu_group *group)
993 static inline struct iommu_group *iommu_group_alloc(void)
995 return ERR_PTR(-ENODEV);
998 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
1003 static inline void iommu_group_set_iommudata(struct iommu_group *group,
1005 void (*release)(void *iommu_data))
1009 static inline int iommu_group_set_name(struct iommu_group *group,
1015 static inline int iommu_group_add_device(struct iommu_group *group,
1021 static inline void iommu_group_remove_device(struct device *dev)
1025 static inline int iommu_group_for_each_dev(struct iommu_group *group,
1027 int (*fn)(struct device *, void *))
1032 static inline struct iommu_group *iommu_group_get(struct device *dev)
1037 static inline void iommu_group_put(struct iommu_group *group)
1042 int iommu_register_device_fault_handler(struct device *dev,
1043 iommu_dev_fault_handler_t handler,
1049 static inline int iommu_unregister_device_fault_handler(struct device *dev)
1055 int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
1060 static inline int iommu_page_response(struct device *dev,
1061 struct iommu_page_response *msg)
1066 static inline int iommu_group_id(struct iommu_group *group)
1071 static inline int iommu_set_pgtable_quirks(struct iommu_domain *domain,
1072 unsigned long quirks)
1077 static inline int iommu_device_register(struct iommu_device *iommu,
1078 const struct iommu_ops *ops,
1079 struct device *hwdev)
1084 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
1089 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
1093 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
1094 struct iommu_iotlb_gather *gather,
1095 unsigned long iova, size_t size)
1099 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
1104 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
1105 struct iova_bitmap *bitmap,
1106 struct iommu_iotlb_gather *gather)
1110 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
1112 unsigned long length)
1116 static inline void iommu_device_unregister(struct iommu_device *iommu)
1120 static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
1121 struct device *parent,
1122 const struct attribute_group **groups,
1123 const char *fmt, ...)
1128 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
1132 static inline int iommu_device_link(struct device *dev, struct device *link)
1137 static inline void iommu_device_unlink(struct device *dev, struct device *link)
1141 static inline int iommu_fwspec_init(struct device *dev,
1142 struct fwnode_handle *iommu_fwnode,
1143 const struct iommu_ops *ops)
1148 static inline void iommu_fwspec_free(struct device *dev)
1152 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
1159 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
1165 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
1171 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1176 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1181 static inline int iommu_device_use_default_domain(struct device *dev)
1186 static inline void iommu_device_unuse_default_domain(struct device *dev)
1191 iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
1196 static inline void iommu_group_release_dma_owner(struct iommu_group *group)
1200 static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
1205 static inline void iommu_device_release_dma_owner(struct device *dev)
1209 static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
1214 static inline struct iommu_domain *
1215 iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
1220 static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
1221 struct device *dev, ioasid_t pasid)
1226 static inline void iommu_detach_device_pasid(struct iommu_domain *domain,
1227 struct device *dev, ioasid_t pasid)
1231 static inline struct iommu_domain *
1232 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
1238 static inline ioasid_t iommu_alloc_global_pasid(struct device *dev)
1240 return IOMMU_PASID_INVALID;
1243 static inline void iommu_free_global_pasid(ioasid_t pasid) {}
1244 #endif /* CONFIG_IOMMU_API */
1247 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1248 * @domain: The IOMMU domain to perform the mapping
1249 * @iova: The start address to map the buffer
1250 * @sgt: The sg_table object describing the buffer
1251 * @prot: IOMMU protection bits
1253 * Creates a mapping at @iova for the buffer described by a scatterlist
1254 * stored in the given sg_table object in the provided IOMMU domain.
1256 static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
1257 unsigned long iova, struct sg_table *sgt, int prot)
1259 return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,
1263 #ifdef CONFIG_IOMMU_DEBUGFS
1264 extern struct dentry *iommu_debugfs_dir;
1265 void iommu_debugfs_setup(void);
1267 static inline void iommu_debugfs_setup(void) {}
1270 #ifdef CONFIG_IOMMU_DMA
1271 #include <linux/msi.h>
1273 /* Setup call for arch DMA mapping code */
1274 void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
1276 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
1278 int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
1279 void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg);
1281 #else /* CONFIG_IOMMU_DMA */
1286 static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
1290 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
1295 static inline int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
1300 static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
1304 #endif /* CONFIG_IOMMU_DMA */
1307 * Newer generations of Tegra SoCs require devices' stream IDs to be directly programmed into
1308 * some registers. These are always paired with a Tegra SMMU or ARM SMMU, for which the contents
1309 * of the struct iommu_fwspec are known. Use this helper to formalize access to these internals.
1311 #define TEGRA_STREAM_ID_BYPASS 0x7f
1313 static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream_id)
1315 #ifdef CONFIG_IOMMU_API
1316 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1318 if (fwspec && fwspec->num_ids == 1) {
1319 *stream_id = fwspec->ids[0] & 0xffff;
1327 #ifdef CONFIG_IOMMU_SVA
1328 static inline void mm_pasid_init(struct mm_struct *mm)
1330 mm->pasid = IOMMU_PASID_INVALID;
1332 static inline bool mm_valid_pasid(struct mm_struct *mm)
1334 return mm->pasid != IOMMU_PASID_INVALID;
1336 void mm_pasid_drop(struct mm_struct *mm);
1337 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
1338 struct mm_struct *mm);
1339 void iommu_sva_unbind_device(struct iommu_sva *handle);
1340 u32 iommu_sva_get_pasid(struct iommu_sva *handle);
1342 static inline struct iommu_sva *
1343 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
1348 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1352 static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1354 return IOMMU_PASID_INVALID;
1356 static inline void mm_pasid_init(struct mm_struct *mm) {}
1357 static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
1358 static inline void mm_pasid_drop(struct mm_struct *mm) {}
1359 #endif /* CONFIG_IOMMU_SVA */
1361 #endif /* __LINUX_IOMMU_H */