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 */
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;
109 const struct iommu_ops *owner; /* Whose domain_alloc we came from */
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;
125 * Next iommu_domain in mm->iommu_mm->sva-domains list
126 * protected by iommu_sva_lock.
128 struct list_head next;
133 static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
135 return domain->type & __IOMMU_DOMAIN_DMA_API;
139 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU_CACHE is supported */
140 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
141 IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
142 DMA protection and we should too */
144 * Per-device flag indicating if enforce_cache_coherency() will work on
147 IOMMU_CAP_ENFORCE_CACHE_COHERENCY,
149 * IOMMU driver does not issue TLB maintenance during .unmap, so can
150 * usefully support the non-strict DMA flush queue.
152 IOMMU_CAP_DEFERRED_FLUSH,
153 IOMMU_CAP_DIRTY_TRACKING, /* IOMMU supports dirty tracking */
156 /* These are the possible reserved region types */
157 enum iommu_resv_type {
158 /* Memory regions which must be mapped 1:1 at all times */
161 * Memory regions which are advertised to be 1:1 but are
162 * commonly considered relaxable in some conditions,
163 * for instance in device assignment use case (USB, Graphics)
165 IOMMU_RESV_DIRECT_RELAXABLE,
166 /* Arbitrary "never map this or give it to a device" address ranges */
168 /* Hardware MSI region (untranslated) */
170 /* Software-managed MSI translation window */
175 * struct iommu_resv_region - descriptor for a reserved memory region
176 * @list: Linked list pointers
177 * @start: System physical start address of the region
178 * @length: Length of the region in bytes
179 * @prot: IOMMU Protection flags (READ/WRITE/...)
180 * @type: Type of the reserved region
181 * @free: Callback to free associated memory allocations
183 struct iommu_resv_region {
184 struct list_head list;
188 enum iommu_resv_type type;
189 void (*free)(struct device *dev, struct iommu_resv_region *region);
192 struct iommu_iort_rmr_data {
193 struct iommu_resv_region rr;
195 /* Stream IDs associated with IORT RMR entry */
201 * enum iommu_dev_features - Per device IOMMU features
202 * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
203 * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
204 * enabling %IOMMU_DEV_FEAT_SVA requires
205 * %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
206 * Faults themselves instead of relying on the IOMMU. When
207 * supported, this feature must be enabled before and
208 * disabled after %IOMMU_DEV_FEAT_SVA.
210 * Device drivers enable a feature using iommu_dev_enable_feature().
212 enum iommu_dev_features {
217 #define IOMMU_NO_PASID (0U) /* Reserved for DMA w/o PASID */
218 #define IOMMU_FIRST_GLOBAL_PASID (1U) /*starting range for allocation */
219 #define IOMMU_PASID_INVALID (-1U)
220 typedef unsigned int ioasid_t;
222 #ifdef CONFIG_IOMMU_API
225 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
227 * @start: IOVA representing the start of the range to be flushed
228 * @end: IOVA representing the end of the range to be flushed (inclusive)
229 * @pgsize: The interval at which to perform the flush
230 * @freelist: Removed pages to free after sync
231 * @queued: Indicates that the flush will be queued
233 * This structure is intended to be updated by multiple calls to the
234 * ->unmap() function in struct iommu_ops before eventually being passed
235 * into ->iotlb_sync(). Drivers can add pages to @freelist to be freed after
236 * ->iotlb_sync() or ->iotlb_flush_all() have cleared all cached references to
237 * them. @queued is set to indicate when ->iotlb_flush_all() will be called
238 * later instead of ->iotlb_sync(), so drivers may optimise accordingly.
240 struct iommu_iotlb_gather {
244 struct list_head freelist;
249 * struct iommu_dirty_bitmap - Dirty IOVA bitmap state
250 * @bitmap: IOVA bitmap
251 * @gather: Range information for a pending IOTLB flush
253 struct iommu_dirty_bitmap {
254 struct iova_bitmap *bitmap;
255 struct iommu_iotlb_gather *gather;
258 /* Read but do not clear any dirty bits */
259 #define IOMMU_DIRTY_NO_CLEAR (1 << 0)
262 * struct iommu_dirty_ops - domain specific dirty tracking operations
263 * @set_dirty_tracking: Enable or Disable dirty tracking on the iommu domain
264 * @read_and_clear_dirty: Walk IOMMU page tables for dirtied PTEs marshalled
265 * into a bitmap, with a bit represented as a page.
266 * Reads the dirty PTE bits and clears it from IO
269 struct iommu_dirty_ops {
270 int (*set_dirty_tracking)(struct iommu_domain *domain, bool enabled);
271 int (*read_and_clear_dirty)(struct iommu_domain *domain,
272 unsigned long iova, size_t size,
274 struct iommu_dirty_bitmap *dirty);
278 * struct iommu_user_data - iommu driver specific user space data info
279 * @type: The data type of the user buffer
280 * @uptr: Pointer to the user buffer for copy_from_user()
281 * @len: The length of the user buffer in bytes
283 * A user space data is an uAPI that is defined in include/uapi/linux/iommufd.h
284 * @type, @uptr and @len should be just copied from an iommufd core uAPI struct.
286 struct iommu_user_data {
293 * struct iommu_user_data_array - iommu driver specific user space data array
294 * @type: The data type of all the entries in the user buffer array
295 * @uptr: Pointer to the user buffer array
296 * @entry_len: The fixed-width length of an entry in the array, in bytes
297 * @entry_num: The number of total entries in the array
299 * The user buffer includes an array of requests with format defined in
300 * include/uapi/linux/iommufd.h
302 struct iommu_user_data_array {
310 * __iommu_copy_struct_from_user - Copy iommu driver specific user space data
311 * @dst_data: Pointer to an iommu driver specific user data that is defined in
312 * include/uapi/linux/iommufd.h
313 * @src_data: Pointer to a struct iommu_user_data for user space data info
314 * @data_type: The data type of the @dst_data. Must match with @src_data.type
315 * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
316 * @min_len: Initial length of user data structure for backward compatibility.
317 * This should be offsetofend using the last member in the user data
318 * struct that was initially added to include/uapi/linux/iommufd.h
320 static inline int __iommu_copy_struct_from_user(
321 void *dst_data, const struct iommu_user_data *src_data,
322 unsigned int data_type, size_t data_len, size_t min_len)
324 if (src_data->type != data_type)
326 if (WARN_ON(!dst_data || !src_data))
328 if (src_data->len < min_len || data_len < src_data->len)
330 return copy_struct_from_user(dst_data, data_len, src_data->uptr,
335 * iommu_copy_struct_from_user - Copy iommu driver specific user space data
336 * @kdst: Pointer to an iommu driver specific user data that is defined in
337 * include/uapi/linux/iommufd.h
338 * @user_data: Pointer to a struct iommu_user_data for user space data info
339 * @data_type: The data type of the @kdst. Must match with @user_data->type
340 * @min_last: The last memember of the data structure @kdst points in the
342 * Return 0 for success, otherwise -error.
344 #define iommu_copy_struct_from_user(kdst, user_data, data_type, min_last) \
345 __iommu_copy_struct_from_user(kdst, user_data, data_type, \
347 offsetofend(typeof(*kdst), min_last))
350 * __iommu_copy_struct_from_user_array - Copy iommu driver specific user space
351 * data from an iommu_user_data_array
352 * @dst_data: Pointer to an iommu driver specific user data that is defined in
353 * include/uapi/linux/iommufd.h
354 * @src_array: Pointer to a struct iommu_user_data_array for a user space array
355 * @data_type: The data type of the @dst_data. Must match with @src_array.type
356 * @index: Index to the location in the array to copy user data from
357 * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
358 * @min_len: Initial length of user data structure for backward compatibility.
359 * This should be offsetofend using the last member in the user data
360 * struct that was initially added to include/uapi/linux/iommufd.h
362 static inline int __iommu_copy_struct_from_user_array(
363 void *dst_data, const struct iommu_user_data_array *src_array,
364 unsigned int data_type, unsigned int index, size_t data_len,
367 struct iommu_user_data src_data;
369 if (WARN_ON(!src_array || index >= src_array->entry_num))
371 if (!src_array->entry_num)
373 src_data.uptr = src_array->uptr + src_array->entry_len * index;
374 src_data.len = src_array->entry_len;
375 src_data.type = src_array->type;
377 return __iommu_copy_struct_from_user(dst_data, &src_data, data_type,
382 * iommu_copy_struct_from_user_array - Copy iommu driver specific user space
383 * data from an iommu_user_data_array
384 * @kdst: Pointer to an iommu driver specific user data that is defined in
385 * include/uapi/linux/iommufd.h
386 * @user_array: Pointer to a struct iommu_user_data_array for a user space
388 * @data_type: The data type of the @kdst. Must match with @user_array->type
389 * @index: Index to the location in the array to copy user data from
390 * @min_last: The last member of the data structure @kdst points in the
392 * Return 0 for success, otherwise -error.
394 #define iommu_copy_struct_from_user_array(kdst, user_array, data_type, index, \
396 __iommu_copy_struct_from_user_array( \
397 kdst, user_array, data_type, index, sizeof(*(kdst)), \
398 offsetofend(typeof(*(kdst)), min_last))
401 * struct iommu_ops - iommu ops and capabilities
402 * @capable: check capability
403 * @hw_info: report iommu hardware information. The data buffer returned by this
404 * op is allocated in the iommu driver and freed by the caller after
405 * use. The information type is one of enum iommu_hw_info_type defined
406 * in include/uapi/linux/iommufd.h.
407 * @domain_alloc: allocate and return an iommu domain if success. Otherwise
408 * NULL is returned. The domain is not fully initialized until
409 * the caller iommu_domain_alloc() returns.
410 * @domain_alloc_user: Allocate an iommu domain corresponding to the input
411 * parameters as defined in include/uapi/linux/iommufd.h.
412 * Unlike @domain_alloc, it is called only by IOMMUFD and
413 * must fully initialize the new domain before return.
414 * Upon success, if the @user_data is valid and the @parent
415 * points to a kernel-managed domain, the new domain must be
416 * IOMMU_DOMAIN_NESTED type; otherwise, the @parent must be
417 * NULL while the @user_data can be optionally provided, the
418 * new domain must support __IOMMU_DOMAIN_PAGING.
419 * Upon failure, ERR_PTR must be returned.
420 * @domain_alloc_paging: Allocate an iommu_domain that can be used for
421 * UNMANAGED, DMA, and DMA_FQ domain types.
422 * @probe_device: Add device to iommu driver handling
423 * @release_device: Remove device from iommu driver handling
424 * @probe_finalize: Do final setup work after the device is added to an IOMMU
425 * group and attached to the groups domain
426 * @device_group: find iommu group for a particular device
427 * @get_resv_regions: Request list of reserved regions for a device
428 * @of_xlate: add OF master IDs to iommu grouping
429 * @is_attach_deferred: Check if domain attach should be deferred from iommu
430 * driver init to device driver init (default no)
431 * @dev_enable/disable_feat: per device entries to enable/disable
432 * iommu specific features.
433 * @page_response: handle page request response
434 * @def_domain_type: device default domain type, return value:
435 * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
436 * - IOMMU_DOMAIN_DMA: must use a dma domain
437 * - 0: use the default setting
438 * @default_domain_ops: the default ops for domains
439 * @remove_dev_pasid: Remove any translation configurations of a specific
440 * pasid, so that any DMA transactions with this pasid
441 * will be blocked by the hardware.
442 * @pgsize_bitmap: bitmap of all possible supported page sizes
443 * @owner: Driver module providing these ops
444 * @identity_domain: An always available, always attachable identity
446 * @blocked_domain: An always available, always attachable blocking
448 * @default_domain: If not NULL this will always be set as the default domain.
449 * This should be an IDENTITY/BLOCKED/PLATFORM domain.
450 * Do not use in new drivers.
453 bool (*capable)(struct device *dev, enum iommu_cap);
454 void *(*hw_info)(struct device *dev, u32 *length, u32 *type);
456 /* Domain allocation and freeing by the iommu driver */
457 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
458 struct iommu_domain *(*domain_alloc_user)(
459 struct device *dev, u32 flags, struct iommu_domain *parent,
460 const struct iommu_user_data *user_data);
461 struct iommu_domain *(*domain_alloc_paging)(struct device *dev);
463 struct iommu_device *(*probe_device)(struct device *dev);
464 void (*release_device)(struct device *dev);
465 void (*probe_finalize)(struct device *dev);
466 struct iommu_group *(*device_group)(struct device *dev);
468 /* Request/Free a list of reserved regions for a device */
469 void (*get_resv_regions)(struct device *dev, struct list_head *list);
471 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
472 bool (*is_attach_deferred)(struct device *dev);
474 /* Per device IOMMU features */
475 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
476 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
478 int (*page_response)(struct device *dev,
479 struct iommu_fault_event *evt,
480 struct iommu_page_response *msg);
482 int (*def_domain_type)(struct device *dev);
483 void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
485 const struct iommu_domain_ops *default_domain_ops;
486 unsigned long pgsize_bitmap;
487 struct module *owner;
488 struct iommu_domain *identity_domain;
489 struct iommu_domain *blocked_domain;
490 struct iommu_domain *default_domain;
494 * struct iommu_domain_ops - domain specific operations
495 * @attach_dev: attach an iommu domain to a device
498 * * EINVAL - can indicate that device and domain are incompatible due to
499 * some previous configuration of the domain, in which case the
500 * driver shouldn't log an error, since it is legitimate for a
501 * caller to test reuse of existing domains. Otherwise, it may
502 * still represent some other fundamental problem
503 * * ENOMEM - out of memory
504 * * ENOSPC - non-ENOMEM type of resource allocation failures
505 * * EBUSY - device is attached to a domain and cannot be changed
506 * * ENODEV - device specific errors, not able to be attached
507 * * <others> - treated as ENODEV by the caller. Use is discouraged
508 * @set_dev_pasid: set an iommu domain to a pasid of device
509 * @map_pages: map a physically contiguous set of pages of the same size to
511 * @unmap_pages: unmap a number of pages of the same size from an iommu domain
512 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
513 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
514 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
516 * @cache_invalidate_user: Flush hardware cache for user space IO page table.
517 * The @domain must be IOMMU_DOMAIN_NESTED. The @array
518 * passes in the cache invalidation requests, in form
519 * of a driver data structure. The driver must update
520 * array->entry_num to report the number of handled
521 * invalidation requests. The driver data structure
522 * must be defined in include/uapi/linux/iommufd.h
523 * @iova_to_phys: translate iova to physical address
524 * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
525 * including no-snoop TLPs on PCIe or other platform
526 * specific mechanisms.
527 * @enable_nesting: Enable nesting
528 * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
529 * @free: Release the domain after use.
531 struct iommu_domain_ops {
532 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
533 int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
536 int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
537 phys_addr_t paddr, size_t pgsize, size_t pgcount,
538 int prot, gfp_t gfp, size_t *mapped);
539 size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
540 size_t pgsize, size_t pgcount,
541 struct iommu_iotlb_gather *iotlb_gather);
543 void (*flush_iotlb_all)(struct iommu_domain *domain);
544 int (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
546 void (*iotlb_sync)(struct iommu_domain *domain,
547 struct iommu_iotlb_gather *iotlb_gather);
548 int (*cache_invalidate_user)(struct iommu_domain *domain,
549 struct iommu_user_data_array *array);
551 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
554 bool (*enforce_cache_coherency)(struct iommu_domain *domain);
555 int (*enable_nesting)(struct iommu_domain *domain);
556 int (*set_pgtable_quirks)(struct iommu_domain *domain,
557 unsigned long quirks);
559 void (*free)(struct iommu_domain *domain);
563 * struct iommu_device - IOMMU core representation of one IOMMU hardware
565 * @list: Used by the iommu-core to keep a list of registered iommus
566 * @ops: iommu-ops for talking to this iommu
567 * @dev: struct device for sysfs handling
568 * @singleton_group: Used internally for drivers that have only one group
569 * @max_pasids: number of supported PASIDs
571 struct iommu_device {
572 struct list_head list;
573 const struct iommu_ops *ops;
574 struct fwnode_handle *fwnode;
576 struct iommu_group *singleton_group;
581 * struct iommu_fault_event - Generic fault event
583 * Can represent recoverable faults such as a page requests or
584 * unrecoverable faults such as DMA or IRQ remapping faults.
586 * @fault: fault descriptor
587 * @list: pending fault event list, used for tracking responses
589 struct iommu_fault_event {
590 struct iommu_fault fault;
591 struct list_head list;
595 * struct iommu_fault_param - per-device IOMMU fault data
596 * @handler: Callback function to handle IOMMU faults at device level
597 * @data: handler private data
598 * @faults: holds the pending faults which needs response
599 * @lock: protect pending faults list
601 struct iommu_fault_param {
602 iommu_dev_fault_handler_t handler;
604 struct list_head faults;
609 * struct dev_iommu - Collection of per-device IOMMU data
611 * @fault_param: IOMMU detected device fault reporting data
612 * @iopf_param: I/O Page Fault queue and data
613 * @fwspec: IOMMU fwspec data
614 * @iommu_dev: IOMMU device this device is linked to
615 * @priv: IOMMU Driver private data
616 * @max_pasids: number of PASIDs this device can consume
617 * @attach_deferred: the dma domain attachment is deferred
618 * @pci_32bit_workaround: Limit DMA allocations to 32-bit IOVAs
619 * @require_direct: device requires IOMMU_RESV_DIRECT regions
620 * @shadow_on_flush: IOTLB flushes are used to sync shadow tables
622 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
623 * struct iommu_group *iommu_group;
627 struct iommu_fault_param *fault_param;
628 struct iopf_device_param *iopf_param;
629 struct iommu_fwspec *fwspec;
630 struct iommu_device *iommu_dev;
633 u32 attach_deferred:1;
634 u32 pci_32bit_workaround:1;
635 u32 require_direct:1;
636 u32 shadow_on_flush:1;
639 int iommu_device_register(struct iommu_device *iommu,
640 const struct iommu_ops *ops,
641 struct device *hwdev);
642 void iommu_device_unregister(struct iommu_device *iommu);
643 int iommu_device_sysfs_add(struct iommu_device *iommu,
644 struct device *parent,
645 const struct attribute_group **groups,
646 const char *fmt, ...) __printf(4, 5);
647 void iommu_device_sysfs_remove(struct iommu_device *iommu);
648 int iommu_device_link(struct iommu_device *iommu, struct device *link);
649 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
650 int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
652 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
654 return (struct iommu_device *)dev_get_drvdata(dev);
657 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
659 *gather = (struct iommu_iotlb_gather) {
661 .freelist = LIST_HEAD_INIT(gather->freelist),
665 extern int bus_iommu_probe(const struct bus_type *bus);
666 extern bool iommu_present(const struct bus_type *bus);
667 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
668 extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
669 extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
670 extern void iommu_domain_free(struct iommu_domain *domain);
671 extern int iommu_attach_device(struct iommu_domain *domain,
673 extern void iommu_detach_device(struct iommu_domain *domain,
675 extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
676 struct device *dev, ioasid_t pasid);
677 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
678 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
679 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
680 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
681 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
683 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
684 unsigned long iova, size_t size,
685 struct iommu_iotlb_gather *iotlb_gather);
686 extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
687 struct scatterlist *sg, unsigned int nents,
688 int prot, gfp_t gfp);
689 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
690 extern void iommu_set_fault_handler(struct iommu_domain *domain,
691 iommu_fault_handler_t handler, void *token);
693 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
694 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
695 extern void iommu_set_default_passthrough(bool cmd_line);
696 extern void iommu_set_default_translated(bool cmd_line);
697 extern bool iommu_default_passthrough(void);
698 extern struct iommu_resv_region *
699 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
700 enum iommu_resv_type type, gfp_t gfp);
701 extern int iommu_get_group_resv_regions(struct iommu_group *group,
702 struct list_head *head);
704 extern int iommu_attach_group(struct iommu_domain *domain,
705 struct iommu_group *group);
706 extern void iommu_detach_group(struct iommu_domain *domain,
707 struct iommu_group *group);
708 extern struct iommu_group *iommu_group_alloc(void);
709 extern void *iommu_group_get_iommudata(struct iommu_group *group);
710 extern void iommu_group_set_iommudata(struct iommu_group *group,
712 void (*release)(void *iommu_data));
713 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
714 extern int iommu_group_add_device(struct iommu_group *group,
716 extern void iommu_group_remove_device(struct device *dev);
717 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
718 int (*fn)(struct device *, void *));
719 extern struct iommu_group *iommu_group_get(struct device *dev);
720 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
721 extern void iommu_group_put(struct iommu_group *group);
722 extern int iommu_register_device_fault_handler(struct device *dev,
723 iommu_dev_fault_handler_t handler,
726 extern int iommu_unregister_device_fault_handler(struct device *dev);
728 extern int iommu_report_device_fault(struct device *dev,
729 struct iommu_fault_event *evt);
730 extern int iommu_page_response(struct device *dev,
731 struct iommu_page_response *msg);
733 extern int iommu_group_id(struct iommu_group *group);
734 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
736 int iommu_enable_nesting(struct iommu_domain *domain);
737 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
738 unsigned long quirks);
740 void iommu_set_dma_strict(void);
742 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
743 unsigned long iova, int flags);
745 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
747 if (domain->ops->flush_iotlb_all)
748 domain->ops->flush_iotlb_all(domain);
751 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
752 struct iommu_iotlb_gather *iotlb_gather)
754 if (domain->ops->iotlb_sync)
755 domain->ops->iotlb_sync(domain, iotlb_gather);
757 iommu_iotlb_gather_init(iotlb_gather);
761 * iommu_iotlb_gather_is_disjoint - Checks whether a new range is disjoint
763 * @gather: TLB gather data
764 * @iova: start of page to invalidate
765 * @size: size of page to invalidate
767 * Helper for IOMMU drivers to check whether a new range and the gathered range
768 * are disjoint. For many IOMMUs, flushing the IOMMU in this case is better
769 * than merging the two, which might lead to unnecessary invalidations.
772 bool iommu_iotlb_gather_is_disjoint(struct iommu_iotlb_gather *gather,
773 unsigned long iova, size_t size)
775 unsigned long start = iova, end = start + size - 1;
777 return gather->end != 0 &&
778 (end + 1 < gather->start || start > gather->end + 1);
783 * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation
784 * @gather: TLB gather data
785 * @iova: start of page to invalidate
786 * @size: size of page to invalidate
788 * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands
789 * where only the address range matters, and simply minimising intermediate
790 * syncs is preferred.
792 static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather,
793 unsigned long iova, size_t size)
795 unsigned long end = iova + size - 1;
797 if (gather->start > iova)
798 gather->start = iova;
799 if (gather->end < end)
804 * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation
805 * @domain: IOMMU domain to be invalidated
806 * @gather: TLB gather data
807 * @iova: start of page to invalidate
808 * @size: size of page to invalidate
810 * Helper for IOMMU drivers to build invalidation commands based on individual
811 * pages, or with page size/table level hints which cannot be gathered if they
814 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
815 struct iommu_iotlb_gather *gather,
816 unsigned long iova, size_t size)
819 * If the new page is disjoint from the current range or is mapped at
820 * a different granularity, then sync the TLB so that the gather
821 * structure can be rewritten.
823 if ((gather->pgsize && gather->pgsize != size) ||
824 iommu_iotlb_gather_is_disjoint(gather, iova, size))
825 iommu_iotlb_sync(domain, gather);
827 gather->pgsize = size;
828 iommu_iotlb_gather_add_range(gather, iova, size);
831 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
833 return gather && gather->queued;
836 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
837 struct iova_bitmap *bitmap,
838 struct iommu_iotlb_gather *gather)
841 iommu_iotlb_gather_init(gather);
843 dirty->bitmap = bitmap;
844 dirty->gather = gather;
847 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
849 unsigned long length)
852 iova_bitmap_set(dirty->bitmap, iova, length);
855 iommu_iotlb_gather_add_range(dirty->gather, iova, length);
858 /* PCI device grouping function */
859 extern struct iommu_group *pci_device_group(struct device *dev);
860 /* Generic device grouping function */
861 extern struct iommu_group *generic_device_group(struct device *dev);
862 /* FSL-MC device grouping function */
863 struct iommu_group *fsl_mc_device_group(struct device *dev);
864 extern struct iommu_group *generic_single_device_group(struct device *dev);
867 * struct iommu_fwspec - per-device IOMMU instance data
868 * @ops: ops for this device's IOMMU
869 * @iommu_fwnode: firmware handle for this device's IOMMU
870 * @flags: IOMMU_FWSPEC_* flags
871 * @num_ids: number of associated device IDs
872 * @ids: IDs which this device may present to the IOMMU
874 * Note that the IDs (and any other information, really) stored in this structure should be
875 * considered private to the IOMMU device driver and are not to be used directly by IOMMU
878 struct iommu_fwspec {
879 const struct iommu_ops *ops;
880 struct fwnode_handle *iommu_fwnode;
882 unsigned int num_ids;
886 /* ATS is supported */
887 #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
890 * struct iommu_sva - handle to a device-mm bond
894 struct iommu_domain *domain;
897 struct iommu_mm_data {
899 struct list_head sva_domains;
902 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
903 const struct iommu_ops *ops);
904 void iommu_fwspec_free(struct device *dev);
905 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
906 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
908 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
911 return dev->iommu->fwspec;
916 static inline void dev_iommu_fwspec_set(struct device *dev,
917 struct iommu_fwspec *fwspec)
919 dev->iommu->fwspec = fwspec;
922 static inline void *dev_iommu_priv_get(struct device *dev)
925 return dev->iommu->priv;
930 void dev_iommu_priv_set(struct device *dev, void *priv);
932 extern struct mutex iommu_probe_device_lock;
933 int iommu_probe_device(struct device *dev);
935 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
936 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
938 int iommu_device_use_default_domain(struct device *dev);
939 void iommu_device_unuse_default_domain(struct device *dev);
941 int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
942 void iommu_group_release_dma_owner(struct iommu_group *group);
943 bool iommu_group_dma_owner_claimed(struct iommu_group *group);
945 int iommu_device_claim_dma_owner(struct device *dev, void *owner);
946 void iommu_device_release_dma_owner(struct device *dev);
948 struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
949 struct mm_struct *mm);
950 int iommu_attach_device_pasid(struct iommu_domain *domain,
951 struct device *dev, ioasid_t pasid);
952 void iommu_detach_device_pasid(struct iommu_domain *domain,
953 struct device *dev, ioasid_t pasid);
954 struct iommu_domain *
955 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
957 ioasid_t iommu_alloc_global_pasid(struct device *dev);
958 void iommu_free_global_pasid(ioasid_t pasid);
959 #else /* CONFIG_IOMMU_API */
962 struct iommu_group {};
963 struct iommu_fwspec {};
964 struct iommu_device {};
965 struct iommu_fault_param {};
966 struct iommu_iotlb_gather {};
967 struct iommu_dirty_bitmap {};
968 struct iommu_dirty_ops {};
970 static inline bool iommu_present(const struct bus_type *bus)
975 static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
980 static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
985 static inline void iommu_domain_free(struct iommu_domain *domain)
989 static inline int iommu_attach_device(struct iommu_domain *domain,
995 static inline void iommu_detach_device(struct iommu_domain *domain,
1000 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
1005 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
1006 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
1011 static inline size_t iommu_unmap(struct iommu_domain *domain,
1012 unsigned long iova, size_t size)
1017 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
1018 unsigned long iova, int gfp_order,
1019 struct iommu_iotlb_gather *iotlb_gather)
1024 static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
1025 unsigned long iova, struct scatterlist *sg,
1026 unsigned int nents, int prot, gfp_t gfp)
1031 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
1035 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
1036 struct iommu_iotlb_gather *iotlb_gather)
1040 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
1045 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
1046 iommu_fault_handler_t handler, void *token)
1050 static inline void iommu_get_resv_regions(struct device *dev,
1051 struct list_head *list)
1055 static inline void iommu_put_resv_regions(struct device *dev,
1056 struct list_head *list)
1060 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
1061 struct list_head *head)
1066 static inline void iommu_set_default_passthrough(bool cmd_line)
1070 static inline void iommu_set_default_translated(bool cmd_line)
1074 static inline bool iommu_default_passthrough(void)
1079 static inline int iommu_attach_group(struct iommu_domain *domain,
1080 struct iommu_group *group)
1085 static inline void iommu_detach_group(struct iommu_domain *domain,
1086 struct iommu_group *group)
1090 static inline struct iommu_group *iommu_group_alloc(void)
1092 return ERR_PTR(-ENODEV);
1095 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
1100 static inline void iommu_group_set_iommudata(struct iommu_group *group,
1102 void (*release)(void *iommu_data))
1106 static inline int iommu_group_set_name(struct iommu_group *group,
1112 static inline int iommu_group_add_device(struct iommu_group *group,
1118 static inline void iommu_group_remove_device(struct device *dev)
1122 static inline int iommu_group_for_each_dev(struct iommu_group *group,
1124 int (*fn)(struct device *, void *))
1129 static inline struct iommu_group *iommu_group_get(struct device *dev)
1134 static inline void iommu_group_put(struct iommu_group *group)
1139 int iommu_register_device_fault_handler(struct device *dev,
1140 iommu_dev_fault_handler_t handler,
1146 static inline int iommu_unregister_device_fault_handler(struct device *dev)
1152 int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
1157 static inline int iommu_page_response(struct device *dev,
1158 struct iommu_page_response *msg)
1163 static inline int iommu_group_id(struct iommu_group *group)
1168 static inline int iommu_set_pgtable_quirks(struct iommu_domain *domain,
1169 unsigned long quirks)
1174 static inline int iommu_device_register(struct iommu_device *iommu,
1175 const struct iommu_ops *ops,
1176 struct device *hwdev)
1181 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
1186 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
1190 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
1191 struct iommu_iotlb_gather *gather,
1192 unsigned long iova, size_t size)
1196 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
1201 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
1202 struct iova_bitmap *bitmap,
1203 struct iommu_iotlb_gather *gather)
1207 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
1209 unsigned long length)
1213 static inline void iommu_device_unregister(struct iommu_device *iommu)
1217 static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
1218 struct device *parent,
1219 const struct attribute_group **groups,
1220 const char *fmt, ...)
1225 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
1229 static inline int iommu_device_link(struct device *dev, struct device *link)
1234 static inline void iommu_device_unlink(struct device *dev, struct device *link)
1238 static inline int iommu_fwspec_init(struct device *dev,
1239 struct fwnode_handle *iommu_fwnode,
1240 const struct iommu_ops *ops)
1245 static inline void iommu_fwspec_free(struct device *dev)
1249 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
1256 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
1262 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
1268 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1273 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1278 static inline int iommu_device_use_default_domain(struct device *dev)
1283 static inline void iommu_device_unuse_default_domain(struct device *dev)
1288 iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
1293 static inline void iommu_group_release_dma_owner(struct iommu_group *group)
1297 static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
1302 static inline void iommu_device_release_dma_owner(struct device *dev)
1306 static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
1311 static inline struct iommu_domain *
1312 iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
1317 static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
1318 struct device *dev, ioasid_t pasid)
1323 static inline void iommu_detach_device_pasid(struct iommu_domain *domain,
1324 struct device *dev, ioasid_t pasid)
1328 static inline struct iommu_domain *
1329 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
1335 static inline ioasid_t iommu_alloc_global_pasid(struct device *dev)
1337 return IOMMU_PASID_INVALID;
1340 static inline void iommu_free_global_pasid(ioasid_t pasid) {}
1341 #endif /* CONFIG_IOMMU_API */
1344 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1345 * @domain: The IOMMU domain to perform the mapping
1346 * @iova: The start address to map the buffer
1347 * @sgt: The sg_table object describing the buffer
1348 * @prot: IOMMU protection bits
1350 * Creates a mapping at @iova for the buffer described by a scatterlist
1351 * stored in the given sg_table object in the provided IOMMU domain.
1353 static inline ssize_t iommu_map_sgtable(struct iommu_domain *domain,
1354 unsigned long iova, struct sg_table *sgt, int prot)
1356 return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,
1360 #ifdef CONFIG_IOMMU_DEBUGFS
1361 extern struct dentry *iommu_debugfs_dir;
1362 void iommu_debugfs_setup(void);
1364 static inline void iommu_debugfs_setup(void) {}
1367 #ifdef CONFIG_IOMMU_DMA
1368 #include <linux/msi.h>
1370 /* Setup call for arch DMA mapping code */
1371 void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
1373 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
1375 int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
1376 void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg);
1378 #else /* CONFIG_IOMMU_DMA */
1383 static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
1387 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
1392 static inline int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
1397 static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
1401 #endif /* CONFIG_IOMMU_DMA */
1404 * Newer generations of Tegra SoCs require devices' stream IDs to be directly programmed into
1405 * some registers. These are always paired with a Tegra SMMU or ARM SMMU, for which the contents
1406 * of the struct iommu_fwspec are known. Use this helper to formalize access to these internals.
1408 #define TEGRA_STREAM_ID_BYPASS 0x7f
1410 static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream_id)
1412 #ifdef CONFIG_IOMMU_API
1413 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1415 if (fwspec && fwspec->num_ids == 1) {
1416 *stream_id = fwspec->ids[0] & 0xffff;
1424 #ifdef CONFIG_IOMMU_MM_DATA
1425 static inline void mm_pasid_init(struct mm_struct *mm)
1428 * During dup_mm(), a new mm will be memcpy'd from an old one and that makes
1429 * the new mm and the old one point to a same iommu_mm instance. When either
1430 * one of the two mms gets released, the iommu_mm instance is freed, leaving
1431 * the other mm running into a use-after-free/double-free problem. To avoid
1432 * the problem, zeroing the iommu_mm pointer of a new mm is needed here.
1434 mm->iommu_mm = NULL;
1437 static inline bool mm_valid_pasid(struct mm_struct *mm)
1439 return READ_ONCE(mm->iommu_mm);
1442 static inline u32 mm_get_enqcmd_pasid(struct mm_struct *mm)
1444 struct iommu_mm_data *iommu_mm = READ_ONCE(mm->iommu_mm);
1447 return IOMMU_PASID_INVALID;
1448 return iommu_mm->pasid;
1451 void mm_pasid_drop(struct mm_struct *mm);
1452 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
1453 struct mm_struct *mm);
1454 void iommu_sva_unbind_device(struct iommu_sva *handle);
1455 u32 iommu_sva_get_pasid(struct iommu_sva *handle);
1457 static inline struct iommu_sva *
1458 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
1463 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1467 static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1469 return IOMMU_PASID_INVALID;
1471 static inline void mm_pasid_init(struct mm_struct *mm) {}
1472 static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
1474 static inline u32 mm_get_enqcmd_pasid(struct mm_struct *mm)
1476 return IOMMU_PASID_INVALID;
1479 static inline void mm_pasid_drop(struct mm_struct *mm) {}
1480 #endif /* CONFIG_IOMMU_SVA */
1482 #endif /* __LINUX_IOMMU_H */