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>
18 #define IOMMU_READ (1 << 0)
19 #define IOMMU_WRITE (1 << 1)
20 #define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
21 #define IOMMU_NOEXEC (1 << 3)
22 #define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
24 * Where the bus hardware includes a privilege level as part of its access type
25 * markings, and certain devices are capable of issuing transactions marked as
26 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
27 * given permission flags only apply to accesses at the higher privilege level,
28 * and that unprivileged transactions should have as little access as possible.
29 * This would usually imply the same permissions as kernel mappings on the CPU,
30 * if the IOMMU page table format is equivalent.
32 #define IOMMU_PRIV (1 << 5)
39 struct iommu_domain_ops;
40 struct iommu_dirty_ops;
41 struct notifier_block;
43 struct iommu_dma_cookie;
44 struct iommu_fault_param;
46 #define IOMMU_FAULT_PERM_READ (1 << 0) /* read */
47 #define IOMMU_FAULT_PERM_WRITE (1 << 1) /* write */
48 #define IOMMU_FAULT_PERM_EXEC (1 << 2) /* exec */
49 #define IOMMU_FAULT_PERM_PRIV (1 << 3) /* privileged */
51 /* Generic fault types, can be expanded IRQ remapping fault */
52 enum iommu_fault_type {
53 IOMMU_FAULT_PAGE_REQ = 1, /* page request fault */
57 * struct iommu_fault_page_request - Page Request data
58 * @flags: encodes whether the corresponding fields are valid and whether this
59 * is the last page in group (IOMMU_FAULT_PAGE_REQUEST_* values).
60 * When IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID is set, the page response
61 * must have the same PASID value as the page request. When it is clear,
62 * the page response should not have a PASID.
63 * @pasid: Process Address Space ID
64 * @grpid: Page Request Group Index
65 * @perm: requested page permissions (IOMMU_FAULT_PERM_* values)
67 * @private_data: device-specific private information
69 struct iommu_fault_page_request {
70 #define IOMMU_FAULT_PAGE_REQUEST_PASID_VALID (1 << 0)
71 #define IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE (1 << 1)
72 #define IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID (1 << 2)
82 * struct iommu_fault - Generic fault data
83 * @type: fault type from &enum iommu_fault_type
84 * @prm: Page Request message, when @type is %IOMMU_FAULT_PAGE_REQ
88 struct iommu_fault_page_request prm;
92 * enum iommu_page_response_code - Return status of fault handlers
93 * @IOMMU_PAGE_RESP_SUCCESS: Fault has been handled and the page tables
94 * populated, retry the access. This is "Success" in PCI PRI.
95 * @IOMMU_PAGE_RESP_FAILURE: General error. Drop all subsequent faults from
96 * this device if possible. This is "Response Failure" in PCI PRI.
97 * @IOMMU_PAGE_RESP_INVALID: Could not handle this fault, don't retry the
98 * access. This is "Invalid Request" in PCI PRI.
100 enum iommu_page_response_code {
101 IOMMU_PAGE_RESP_SUCCESS = 0,
102 IOMMU_PAGE_RESP_INVALID,
103 IOMMU_PAGE_RESP_FAILURE,
107 * struct iommu_page_response - Generic page response information
108 * @pasid: Process Address Space ID
109 * @grpid: Page Request Group Index
110 * @code: response code from &enum iommu_page_response_code
112 struct iommu_page_response {
119 struct iommu_fault fault;
120 /* node for pending lists */
121 struct list_head list;
125 struct iopf_fault last_fault;
126 struct list_head faults;
127 /* list node for iommu_fault_param::faults */
128 struct list_head pending_node;
129 struct work_struct work;
130 struct iommu_domain *domain;
131 /* The device's fault data parameter. */
132 struct iommu_fault_param *fault_param;
136 * struct iopf_queue - IO Page Fault queue
137 * @wq: the fault workqueue
138 * @devices: devices attached to this queue
139 * @lock: protects the device list
142 struct workqueue_struct *wq;
143 struct list_head devices;
147 /* iommu fault flags */
148 #define IOMMU_FAULT_READ 0x0
149 #define IOMMU_FAULT_WRITE 0x1
151 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
152 struct device *, unsigned long, int, void *);
154 struct iommu_domain_geometry {
155 dma_addr_t aperture_start; /* First address that can be mapped */
156 dma_addr_t aperture_end; /* Last address that can be mapped */
157 bool force_aperture; /* DMA only allowed in mappable range? */
160 /* Domain feature flags */
161 #define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
162 #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
164 #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
165 #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */
167 #define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */
168 #define __IOMMU_DOMAIN_PLATFORM (1U << 5)
170 #define __IOMMU_DOMAIN_NESTED (1U << 6) /* User-managed address space nested
171 on a stage-2 translation */
173 #define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ
175 * This are the possible domain-types
177 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
179 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
180 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
182 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
183 * This flag allows IOMMU drivers to implement
184 * certain optimizations for these domains
185 * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB
187 * IOMMU_DOMAIN_SVA - DMA addresses are shared process addresses
188 * represented by mm_struct's.
189 * IOMMU_DOMAIN_PLATFORM - Legacy domain for drivers that do their own
190 * dma_api stuff. Do not use in new drivers.
192 #define IOMMU_DOMAIN_BLOCKED (0U)
193 #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
194 #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
195 #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
196 __IOMMU_DOMAIN_DMA_API)
197 #define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \
198 __IOMMU_DOMAIN_DMA_API | \
199 __IOMMU_DOMAIN_DMA_FQ)
200 #define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA)
201 #define IOMMU_DOMAIN_PLATFORM (__IOMMU_DOMAIN_PLATFORM)
202 #define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED)
204 struct iommu_domain {
206 const struct iommu_domain_ops *ops;
207 const struct iommu_dirty_ops *dirty_ops;
208 const struct iommu_ops *owner; /* Whose domain_alloc we came from */
209 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
210 struct iommu_domain_geometry geometry;
211 struct iommu_dma_cookie *iova_cookie;
212 int (*iopf_handler)(struct iopf_group *group);
216 iommu_fault_handler_t handler;
219 struct { /* IOMMU_DOMAIN_SVA */
220 struct mm_struct *mm;
223 * Next iommu_domain in mm->iommu_mm->sva-domains list
224 * protected by iommu_sva_lock.
226 struct list_head next;
231 static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
233 return domain->type & __IOMMU_DOMAIN_DMA_API;
237 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU_CACHE is supported */
238 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
239 IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
240 DMA protection and we should too */
242 * Per-device flag indicating if enforce_cache_coherency() will work on
245 IOMMU_CAP_ENFORCE_CACHE_COHERENCY,
247 * IOMMU driver does not issue TLB maintenance during .unmap, so can
248 * usefully support the non-strict DMA flush queue.
250 IOMMU_CAP_DEFERRED_FLUSH,
251 IOMMU_CAP_DIRTY_TRACKING, /* IOMMU supports dirty tracking */
254 /* These are the possible reserved region types */
255 enum iommu_resv_type {
256 /* Memory regions which must be mapped 1:1 at all times */
259 * Memory regions which are advertised to be 1:1 but are
260 * commonly considered relaxable in some conditions,
261 * for instance in device assignment use case (USB, Graphics)
263 IOMMU_RESV_DIRECT_RELAXABLE,
264 /* Arbitrary "never map this or give it to a device" address ranges */
266 /* Hardware MSI region (untranslated) */
268 /* Software-managed MSI translation window */
273 * struct iommu_resv_region - descriptor for a reserved memory region
274 * @list: Linked list pointers
275 * @start: System physical start address of the region
276 * @length: Length of the region in bytes
277 * @prot: IOMMU Protection flags (READ/WRITE/...)
278 * @type: Type of the reserved region
279 * @free: Callback to free associated memory allocations
281 struct iommu_resv_region {
282 struct list_head list;
286 enum iommu_resv_type type;
287 void (*free)(struct device *dev, struct iommu_resv_region *region);
290 struct iommu_iort_rmr_data {
291 struct iommu_resv_region rr;
293 /* Stream IDs associated with IORT RMR entry */
299 * enum iommu_dev_features - Per device IOMMU features
300 * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
301 * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
302 * enabling %IOMMU_DEV_FEAT_SVA requires
303 * %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
304 * Faults themselves instead of relying on the IOMMU. When
305 * supported, this feature must be enabled before and
306 * disabled after %IOMMU_DEV_FEAT_SVA.
308 * Device drivers enable a feature using iommu_dev_enable_feature().
310 enum iommu_dev_features {
315 #define IOMMU_NO_PASID (0U) /* Reserved for DMA w/o PASID */
316 #define IOMMU_FIRST_GLOBAL_PASID (1U) /*starting range for allocation */
317 #define IOMMU_PASID_INVALID (-1U)
318 typedef unsigned int ioasid_t;
320 #ifdef CONFIG_IOMMU_API
323 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
325 * @start: IOVA representing the start of the range to be flushed
326 * @end: IOVA representing the end of the range to be flushed (inclusive)
327 * @pgsize: The interval at which to perform the flush
328 * @freelist: Removed pages to free after sync
329 * @queued: Indicates that the flush will be queued
331 * This structure is intended to be updated by multiple calls to the
332 * ->unmap() function in struct iommu_ops before eventually being passed
333 * into ->iotlb_sync(). Drivers can add pages to @freelist to be freed after
334 * ->iotlb_sync() or ->iotlb_flush_all() have cleared all cached references to
335 * them. @queued is set to indicate when ->iotlb_flush_all() will be called
336 * later instead of ->iotlb_sync(), so drivers may optimise accordingly.
338 struct iommu_iotlb_gather {
342 struct list_head freelist;
347 * struct iommu_dirty_bitmap - Dirty IOVA bitmap state
348 * @bitmap: IOVA bitmap
349 * @gather: Range information for a pending IOTLB flush
351 struct iommu_dirty_bitmap {
352 struct iova_bitmap *bitmap;
353 struct iommu_iotlb_gather *gather;
356 /* Read but do not clear any dirty bits */
357 #define IOMMU_DIRTY_NO_CLEAR (1 << 0)
360 * struct iommu_dirty_ops - domain specific dirty tracking operations
361 * @set_dirty_tracking: Enable or Disable dirty tracking on the iommu domain
362 * @read_and_clear_dirty: Walk IOMMU page tables for dirtied PTEs marshalled
363 * into a bitmap, with a bit represented as a page.
364 * Reads the dirty PTE bits and clears it from IO
367 struct iommu_dirty_ops {
368 int (*set_dirty_tracking)(struct iommu_domain *domain, bool enabled);
369 int (*read_and_clear_dirty)(struct iommu_domain *domain,
370 unsigned long iova, size_t size,
372 struct iommu_dirty_bitmap *dirty);
376 * struct iommu_user_data - iommu driver specific user space data info
377 * @type: The data type of the user buffer
378 * @uptr: Pointer to the user buffer for copy_from_user()
379 * @len: The length of the user buffer in bytes
381 * A user space data is an uAPI that is defined in include/uapi/linux/iommufd.h
382 * @type, @uptr and @len should be just copied from an iommufd core uAPI struct.
384 struct iommu_user_data {
391 * struct iommu_user_data_array - iommu driver specific user space data array
392 * @type: The data type of all the entries in the user buffer array
393 * @uptr: Pointer to the user buffer array
394 * @entry_len: The fixed-width length of an entry in the array, in bytes
395 * @entry_num: The number of total entries in the array
397 * The user buffer includes an array of requests with format defined in
398 * include/uapi/linux/iommufd.h
400 struct iommu_user_data_array {
408 * __iommu_copy_struct_from_user - Copy iommu driver specific user space data
409 * @dst_data: Pointer to an iommu driver specific user data that is defined in
410 * include/uapi/linux/iommufd.h
411 * @src_data: Pointer to a struct iommu_user_data for user space data info
412 * @data_type: The data type of the @dst_data. Must match with @src_data.type
413 * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
414 * @min_len: Initial length of user data structure for backward compatibility.
415 * This should be offsetofend using the last member in the user data
416 * struct that was initially added to include/uapi/linux/iommufd.h
418 static inline int __iommu_copy_struct_from_user(
419 void *dst_data, const struct iommu_user_data *src_data,
420 unsigned int data_type, size_t data_len, size_t min_len)
422 if (src_data->type != data_type)
424 if (WARN_ON(!dst_data || !src_data))
426 if (src_data->len < min_len || data_len < src_data->len)
428 return copy_struct_from_user(dst_data, data_len, src_data->uptr,
433 * iommu_copy_struct_from_user - Copy iommu driver specific user space data
434 * @kdst: Pointer to an iommu driver specific user data that is defined in
435 * include/uapi/linux/iommufd.h
436 * @user_data: Pointer to a struct iommu_user_data for user space data info
437 * @data_type: The data type of the @kdst. Must match with @user_data->type
438 * @min_last: The last memember of the data structure @kdst points in the
440 * Return 0 for success, otherwise -error.
442 #define iommu_copy_struct_from_user(kdst, user_data, data_type, min_last) \
443 __iommu_copy_struct_from_user(kdst, user_data, data_type, \
445 offsetofend(typeof(*kdst), min_last))
448 * __iommu_copy_struct_from_user_array - Copy iommu driver specific user space
449 * data from an iommu_user_data_array
450 * @dst_data: Pointer to an iommu driver specific user data that is defined in
451 * include/uapi/linux/iommufd.h
452 * @src_array: Pointer to a struct iommu_user_data_array for a user space array
453 * @data_type: The data type of the @dst_data. Must match with @src_array.type
454 * @index: Index to the location in the array to copy user data from
455 * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
456 * @min_len: Initial length of user data structure for backward compatibility.
457 * This should be offsetofend using the last member in the user data
458 * struct that was initially added to include/uapi/linux/iommufd.h
460 static inline int __iommu_copy_struct_from_user_array(
461 void *dst_data, const struct iommu_user_data_array *src_array,
462 unsigned int data_type, unsigned int index, size_t data_len,
465 struct iommu_user_data src_data;
467 if (WARN_ON(!src_array || index >= src_array->entry_num))
469 if (!src_array->entry_num)
471 src_data.uptr = src_array->uptr + src_array->entry_len * index;
472 src_data.len = src_array->entry_len;
473 src_data.type = src_array->type;
475 return __iommu_copy_struct_from_user(dst_data, &src_data, data_type,
480 * iommu_copy_struct_from_user_array - Copy iommu driver specific user space
481 * data from an iommu_user_data_array
482 * @kdst: Pointer to an iommu driver specific user data that is defined in
483 * include/uapi/linux/iommufd.h
484 * @user_array: Pointer to a struct iommu_user_data_array for a user space
486 * @data_type: The data type of the @kdst. Must match with @user_array->type
487 * @index: Index to the location in the array to copy user data from
488 * @min_last: The last member of the data structure @kdst points in the
490 * Return 0 for success, otherwise -error.
492 #define iommu_copy_struct_from_user_array(kdst, user_array, data_type, index, \
494 __iommu_copy_struct_from_user_array( \
495 kdst, user_array, data_type, index, sizeof(*(kdst)), \
496 offsetofend(typeof(*(kdst)), min_last))
499 * struct iommu_ops - iommu ops and capabilities
500 * @capable: check capability
501 * @hw_info: report iommu hardware information. The data buffer returned by this
502 * op is allocated in the iommu driver and freed by the caller after
503 * use. The information type is one of enum iommu_hw_info_type defined
504 * in include/uapi/linux/iommufd.h.
505 * @domain_alloc: allocate and return an iommu domain if success. Otherwise
506 * NULL is returned. The domain is not fully initialized until
507 * the caller iommu_domain_alloc() returns.
508 * @domain_alloc_user: Allocate an iommu domain corresponding to the input
509 * parameters as defined in include/uapi/linux/iommufd.h.
510 * Unlike @domain_alloc, it is called only by IOMMUFD and
511 * must fully initialize the new domain before return.
512 * Upon success, if the @user_data is valid and the @parent
513 * points to a kernel-managed domain, the new domain must be
514 * IOMMU_DOMAIN_NESTED type; otherwise, the @parent must be
515 * NULL while the @user_data can be optionally provided, the
516 * new domain must support __IOMMU_DOMAIN_PAGING.
517 * Upon failure, ERR_PTR must be returned.
518 * @domain_alloc_paging: Allocate an iommu_domain that can be used for
519 * UNMANAGED, DMA, and DMA_FQ domain types.
520 * @domain_alloc_sva: Allocate an iommu_domain for Shared Virtual Addressing.
521 * @probe_device: Add device to iommu driver handling
522 * @release_device: Remove device from iommu driver handling
523 * @probe_finalize: Do final setup work after the device is added to an IOMMU
524 * group and attached to the groups domain
525 * @device_group: find iommu group for a particular device
526 * @get_resv_regions: Request list of reserved regions for a device
527 * @of_xlate: add OF master IDs to iommu grouping
528 * @is_attach_deferred: Check if domain attach should be deferred from iommu
529 * driver init to device driver init (default no)
530 * @dev_enable/disable_feat: per device entries to enable/disable
531 * iommu specific features.
532 * @page_response: handle page request response
533 * @def_domain_type: device default domain type, return value:
534 * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
535 * - IOMMU_DOMAIN_DMA: must use a dma domain
536 * - 0: use the default setting
537 * @default_domain_ops: the default ops for domains
538 * @remove_dev_pasid: Remove any translation configurations of a specific
539 * pasid, so that any DMA transactions with this pasid
540 * will be blocked by the hardware.
541 * @pgsize_bitmap: bitmap of all possible supported page sizes
542 * @owner: Driver module providing these ops
543 * @identity_domain: An always available, always attachable identity
545 * @blocked_domain: An always available, always attachable blocking
547 * @default_domain: If not NULL this will always be set as the default domain.
548 * This should be an IDENTITY/BLOCKED/PLATFORM domain.
549 * Do not use in new drivers.
552 bool (*capable)(struct device *dev, enum iommu_cap);
553 void *(*hw_info)(struct device *dev, u32 *length, u32 *type);
555 /* Domain allocation and freeing by the iommu driver */
556 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
557 struct iommu_domain *(*domain_alloc_user)(
558 struct device *dev, u32 flags, struct iommu_domain *parent,
559 const struct iommu_user_data *user_data);
560 struct iommu_domain *(*domain_alloc_paging)(struct device *dev);
561 struct iommu_domain *(*domain_alloc_sva)(struct device *dev,
562 struct mm_struct *mm);
564 struct iommu_device *(*probe_device)(struct device *dev);
565 void (*release_device)(struct device *dev);
566 void (*probe_finalize)(struct device *dev);
567 struct iommu_group *(*device_group)(struct device *dev);
569 /* Request/Free a list of reserved regions for a device */
570 void (*get_resv_regions)(struct device *dev, struct list_head *list);
572 int (*of_xlate)(struct device *dev, const struct of_phandle_args *args);
573 bool (*is_attach_deferred)(struct device *dev);
575 /* Per device IOMMU features */
576 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
577 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
579 void (*page_response)(struct device *dev, struct iopf_fault *evt,
580 struct iommu_page_response *msg);
582 int (*def_domain_type)(struct device *dev);
583 void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid,
584 struct iommu_domain *domain);
586 const struct iommu_domain_ops *default_domain_ops;
587 unsigned long pgsize_bitmap;
588 struct module *owner;
589 struct iommu_domain *identity_domain;
590 struct iommu_domain *blocked_domain;
591 struct iommu_domain *release_domain;
592 struct iommu_domain *default_domain;
596 * struct iommu_domain_ops - domain specific operations
597 * @attach_dev: attach an iommu domain to a device
600 * * EINVAL - can indicate that device and domain are incompatible due to
601 * some previous configuration of the domain, in which case the
602 * driver shouldn't log an error, since it is legitimate for a
603 * caller to test reuse of existing domains. Otherwise, it may
604 * still represent some other fundamental problem
605 * * ENOMEM - out of memory
606 * * ENOSPC - non-ENOMEM type of resource allocation failures
607 * * EBUSY - device is attached to a domain and cannot be changed
608 * * ENODEV - device specific errors, not able to be attached
609 * * <others> - treated as ENODEV by the caller. Use is discouraged
610 * @set_dev_pasid: set an iommu domain to a pasid of device
611 * @map_pages: map a physically contiguous set of pages of the same size to
613 * @unmap_pages: unmap a number of pages of the same size from an iommu domain
614 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
615 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
616 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
618 * @cache_invalidate_user: Flush hardware cache for user space IO page table.
619 * The @domain must be IOMMU_DOMAIN_NESTED. The @array
620 * passes in the cache invalidation requests, in form
621 * of a driver data structure. The driver must update
622 * array->entry_num to report the number of handled
623 * invalidation requests. The driver data structure
624 * must be defined in include/uapi/linux/iommufd.h
625 * @iova_to_phys: translate iova to physical address
626 * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
627 * including no-snoop TLPs on PCIe or other platform
628 * specific mechanisms.
629 * @enable_nesting: Enable nesting
630 * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
631 * @free: Release the domain after use.
633 struct iommu_domain_ops {
634 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
635 int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
638 int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
639 phys_addr_t paddr, size_t pgsize, size_t pgcount,
640 int prot, gfp_t gfp, size_t *mapped);
641 size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
642 size_t pgsize, size_t pgcount,
643 struct iommu_iotlb_gather *iotlb_gather);
645 void (*flush_iotlb_all)(struct iommu_domain *domain);
646 int (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
648 void (*iotlb_sync)(struct iommu_domain *domain,
649 struct iommu_iotlb_gather *iotlb_gather);
650 int (*cache_invalidate_user)(struct iommu_domain *domain,
651 struct iommu_user_data_array *array);
653 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
656 bool (*enforce_cache_coherency)(struct iommu_domain *domain);
657 int (*enable_nesting)(struct iommu_domain *domain);
658 int (*set_pgtable_quirks)(struct iommu_domain *domain,
659 unsigned long quirks);
661 void (*free)(struct iommu_domain *domain);
665 * struct iommu_device - IOMMU core representation of one IOMMU hardware
667 * @list: Used by the iommu-core to keep a list of registered iommus
668 * @ops: iommu-ops for talking to this iommu
669 * @dev: struct device for sysfs handling
670 * @singleton_group: Used internally for drivers that have only one group
671 * @max_pasids: number of supported PASIDs
673 struct iommu_device {
674 struct list_head list;
675 const struct iommu_ops *ops;
676 struct fwnode_handle *fwnode;
678 struct iommu_group *singleton_group;
683 * struct iommu_fault_param - per-device IOMMU fault data
684 * @lock: protect pending faults list
685 * @users: user counter to manage the lifetime of the data
686 * @rcu: rcu head for kfree_rcu()
687 * @dev: the device that owns this param
689 * @queue_list: index into queue->devices
690 * @partial: faults that are part of a Page Request Group for which the last
691 * request hasn't been submitted yet.
692 * @faults: holds the pending faults which need response
694 struct iommu_fault_param {
700 struct iopf_queue *queue;
701 struct list_head queue_list;
703 struct list_head partial;
704 struct list_head faults;
708 * struct dev_iommu - Collection of per-device IOMMU data
710 * @fault_param: IOMMU detected device fault reporting data
711 * @fwspec: IOMMU fwspec data
712 * @iommu_dev: IOMMU device this device is linked to
713 * @priv: IOMMU Driver private data
714 * @max_pasids: number of PASIDs this device can consume
715 * @attach_deferred: the dma domain attachment is deferred
716 * @pci_32bit_workaround: Limit DMA allocations to 32-bit IOVAs
717 * @require_direct: device requires IOMMU_RESV_DIRECT regions
718 * @shadow_on_flush: IOTLB flushes are used to sync shadow tables
720 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
721 * struct iommu_group *iommu_group;
725 struct iommu_fault_param __rcu *fault_param;
726 struct iommu_fwspec *fwspec;
727 struct iommu_device *iommu_dev;
730 u32 attach_deferred:1;
731 u32 pci_32bit_workaround:1;
732 u32 require_direct:1;
733 u32 shadow_on_flush:1;
736 int iommu_device_register(struct iommu_device *iommu,
737 const struct iommu_ops *ops,
738 struct device *hwdev);
739 void iommu_device_unregister(struct iommu_device *iommu);
740 int iommu_device_sysfs_add(struct iommu_device *iommu,
741 struct device *parent,
742 const struct attribute_group **groups,
743 const char *fmt, ...) __printf(4, 5);
744 void iommu_device_sysfs_remove(struct iommu_device *iommu);
745 int iommu_device_link(struct iommu_device *iommu, struct device *link);
746 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
747 int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
749 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
751 return (struct iommu_device *)dev_get_drvdata(dev);
755 * iommu_get_iommu_dev - Get iommu_device for a device
756 * @dev: an end-point device
758 * Note that this function must be called from the iommu_ops
759 * to retrieve the iommu_device for a device, which the core code
760 * guarentees it will not invoke the op without an attached iommu.
762 static inline struct iommu_device *__iommu_get_iommu_dev(struct device *dev)
764 return dev->iommu->iommu_dev;
767 #define iommu_get_iommu_dev(dev, type, member) \
768 container_of(__iommu_get_iommu_dev(dev), type, member)
770 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
772 *gather = (struct iommu_iotlb_gather) {
774 .freelist = LIST_HEAD_INIT(gather->freelist),
778 extern int bus_iommu_probe(const struct bus_type *bus);
779 extern bool iommu_present(const struct bus_type *bus);
780 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
781 extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
782 extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
783 extern void iommu_domain_free(struct iommu_domain *domain);
784 extern int iommu_attach_device(struct iommu_domain *domain,
786 extern void iommu_detach_device(struct iommu_domain *domain,
788 extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
789 struct device *dev, ioasid_t pasid);
790 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
791 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
792 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
793 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
794 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
796 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
797 unsigned long iova, size_t size,
798 struct iommu_iotlb_gather *iotlb_gather);
799 extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
800 struct scatterlist *sg, unsigned int nents,
801 int prot, gfp_t gfp);
802 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
803 extern void iommu_set_fault_handler(struct iommu_domain *domain,
804 iommu_fault_handler_t handler, void *token);
806 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
807 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
808 extern void iommu_set_default_passthrough(bool cmd_line);
809 extern void iommu_set_default_translated(bool cmd_line);
810 extern bool iommu_default_passthrough(void);
811 extern struct iommu_resv_region *
812 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
813 enum iommu_resv_type type, gfp_t gfp);
814 extern int iommu_get_group_resv_regions(struct iommu_group *group,
815 struct list_head *head);
817 extern int iommu_attach_group(struct iommu_domain *domain,
818 struct iommu_group *group);
819 extern void iommu_detach_group(struct iommu_domain *domain,
820 struct iommu_group *group);
821 extern struct iommu_group *iommu_group_alloc(void);
822 extern void *iommu_group_get_iommudata(struct iommu_group *group);
823 extern void iommu_group_set_iommudata(struct iommu_group *group,
825 void (*release)(void *iommu_data));
826 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
827 extern int iommu_group_add_device(struct iommu_group *group,
829 extern void iommu_group_remove_device(struct device *dev);
830 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
831 int (*fn)(struct device *, void *));
832 extern struct iommu_group *iommu_group_get(struct device *dev);
833 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
834 extern void iommu_group_put(struct iommu_group *group);
836 extern int iommu_group_id(struct iommu_group *group);
837 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
839 int iommu_enable_nesting(struct iommu_domain *domain);
840 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
841 unsigned long quirks);
843 void iommu_set_dma_strict(void);
845 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
846 unsigned long iova, int flags);
848 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
850 if (domain->ops->flush_iotlb_all)
851 domain->ops->flush_iotlb_all(domain);
854 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
855 struct iommu_iotlb_gather *iotlb_gather)
857 if (domain->ops->iotlb_sync)
858 domain->ops->iotlb_sync(domain, iotlb_gather);
860 iommu_iotlb_gather_init(iotlb_gather);
864 * iommu_iotlb_gather_is_disjoint - Checks whether a new range is disjoint
866 * @gather: TLB gather data
867 * @iova: start of page to invalidate
868 * @size: size of page to invalidate
870 * Helper for IOMMU drivers to check whether a new range and the gathered range
871 * are disjoint. For many IOMMUs, flushing the IOMMU in this case is better
872 * than merging the two, which might lead to unnecessary invalidations.
875 bool iommu_iotlb_gather_is_disjoint(struct iommu_iotlb_gather *gather,
876 unsigned long iova, size_t size)
878 unsigned long start = iova, end = start + size - 1;
880 return gather->end != 0 &&
881 (end + 1 < gather->start || start > gather->end + 1);
886 * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation
887 * @gather: TLB gather data
888 * @iova: start of page to invalidate
889 * @size: size of page to invalidate
891 * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands
892 * where only the address range matters, and simply minimising intermediate
893 * syncs is preferred.
895 static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather,
896 unsigned long iova, size_t size)
898 unsigned long end = iova + size - 1;
900 if (gather->start > iova)
901 gather->start = iova;
902 if (gather->end < end)
907 * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation
908 * @domain: IOMMU domain to be invalidated
909 * @gather: TLB gather data
910 * @iova: start of page to invalidate
911 * @size: size of page to invalidate
913 * Helper for IOMMU drivers to build invalidation commands based on individual
914 * pages, or with page size/table level hints which cannot be gathered if they
917 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
918 struct iommu_iotlb_gather *gather,
919 unsigned long iova, size_t size)
922 * If the new page is disjoint from the current range or is mapped at
923 * a different granularity, then sync the TLB so that the gather
924 * structure can be rewritten.
926 if ((gather->pgsize && gather->pgsize != size) ||
927 iommu_iotlb_gather_is_disjoint(gather, iova, size))
928 iommu_iotlb_sync(domain, gather);
930 gather->pgsize = size;
931 iommu_iotlb_gather_add_range(gather, iova, size);
934 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
936 return gather && gather->queued;
939 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
940 struct iova_bitmap *bitmap,
941 struct iommu_iotlb_gather *gather)
944 iommu_iotlb_gather_init(gather);
946 dirty->bitmap = bitmap;
947 dirty->gather = gather;
950 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
952 unsigned long length)
955 iova_bitmap_set(dirty->bitmap, iova, length);
958 iommu_iotlb_gather_add_range(dirty->gather, iova, length);
961 /* PCI device grouping function */
962 extern struct iommu_group *pci_device_group(struct device *dev);
963 /* Generic device grouping function */
964 extern struct iommu_group *generic_device_group(struct device *dev);
965 /* FSL-MC device grouping function */
966 struct iommu_group *fsl_mc_device_group(struct device *dev);
967 extern struct iommu_group *generic_single_device_group(struct device *dev);
970 * struct iommu_fwspec - per-device IOMMU instance data
971 * @ops: ops for this device's IOMMU
972 * @iommu_fwnode: firmware handle for this device's IOMMU
973 * @flags: IOMMU_FWSPEC_* flags
974 * @num_ids: number of associated device IDs
975 * @ids: IDs which this device may present to the IOMMU
977 * Note that the IDs (and any other information, really) stored in this structure should be
978 * considered private to the IOMMU device driver and are not to be used directly by IOMMU
981 struct iommu_fwspec {
982 const struct iommu_ops *ops;
983 struct fwnode_handle *iommu_fwnode;
985 unsigned int num_ids;
989 /* ATS is supported */
990 #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
993 * struct iommu_sva - handle to a device-mm bond
997 struct iommu_domain *domain;
998 struct list_head handle_item;
1002 struct iommu_mm_data {
1004 struct list_head sva_domains;
1005 struct list_head sva_handles;
1008 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
1009 const struct iommu_ops *ops);
1010 void iommu_fwspec_free(struct device *dev);
1011 int iommu_fwspec_add_ids(struct device *dev, const u32 *ids, int num_ids);
1012 const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode);
1014 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1017 return dev->iommu->fwspec;
1022 static inline void dev_iommu_fwspec_set(struct device *dev,
1023 struct iommu_fwspec *fwspec)
1025 dev->iommu->fwspec = fwspec;
1028 static inline void *dev_iommu_priv_get(struct device *dev)
1031 return dev->iommu->priv;
1036 void dev_iommu_priv_set(struct device *dev, void *priv);
1038 extern struct mutex iommu_probe_device_lock;
1039 int iommu_probe_device(struct device *dev);
1041 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
1042 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
1044 int iommu_device_use_default_domain(struct device *dev);
1045 void iommu_device_unuse_default_domain(struct device *dev);
1047 int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
1048 void iommu_group_release_dma_owner(struct iommu_group *group);
1049 bool iommu_group_dma_owner_claimed(struct iommu_group *group);
1051 int iommu_device_claim_dma_owner(struct device *dev, void *owner);
1052 void iommu_device_release_dma_owner(struct device *dev);
1054 int iommu_attach_device_pasid(struct iommu_domain *domain,
1055 struct device *dev, ioasid_t pasid);
1056 void iommu_detach_device_pasid(struct iommu_domain *domain,
1057 struct device *dev, ioasid_t pasid);
1058 struct iommu_domain *
1059 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
1061 ioasid_t iommu_alloc_global_pasid(struct device *dev);
1062 void iommu_free_global_pasid(ioasid_t pasid);
1063 #else /* CONFIG_IOMMU_API */
1065 struct iommu_ops {};
1066 struct iommu_group {};
1067 struct iommu_fwspec {};
1068 struct iommu_device {};
1069 struct iommu_fault_param {};
1070 struct iommu_iotlb_gather {};
1071 struct iommu_dirty_bitmap {};
1072 struct iommu_dirty_ops {};
1074 static inline bool iommu_present(const struct bus_type *bus)
1079 static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
1084 static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
1089 static inline void iommu_domain_free(struct iommu_domain *domain)
1093 static inline int iommu_attach_device(struct iommu_domain *domain,
1099 static inline void iommu_detach_device(struct iommu_domain *domain,
1104 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
1109 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
1110 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
1115 static inline size_t iommu_unmap(struct iommu_domain *domain,
1116 unsigned long iova, size_t size)
1121 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
1122 unsigned long iova, int gfp_order,
1123 struct iommu_iotlb_gather *iotlb_gather)
1128 static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
1129 unsigned long iova, struct scatterlist *sg,
1130 unsigned int nents, int prot, gfp_t gfp)
1135 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
1139 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
1140 struct iommu_iotlb_gather *iotlb_gather)
1144 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
1149 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
1150 iommu_fault_handler_t handler, void *token)
1154 static inline void iommu_get_resv_regions(struct device *dev,
1155 struct list_head *list)
1159 static inline void iommu_put_resv_regions(struct device *dev,
1160 struct list_head *list)
1164 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
1165 struct list_head *head)
1170 static inline void iommu_set_default_passthrough(bool cmd_line)
1174 static inline void iommu_set_default_translated(bool cmd_line)
1178 static inline bool iommu_default_passthrough(void)
1183 static inline int iommu_attach_group(struct iommu_domain *domain,
1184 struct iommu_group *group)
1189 static inline void iommu_detach_group(struct iommu_domain *domain,
1190 struct iommu_group *group)
1194 static inline struct iommu_group *iommu_group_alloc(void)
1196 return ERR_PTR(-ENODEV);
1199 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
1204 static inline void iommu_group_set_iommudata(struct iommu_group *group,
1206 void (*release)(void *iommu_data))
1210 static inline int iommu_group_set_name(struct iommu_group *group,
1216 static inline int iommu_group_add_device(struct iommu_group *group,
1222 static inline void iommu_group_remove_device(struct device *dev)
1226 static inline int iommu_group_for_each_dev(struct iommu_group *group,
1228 int (*fn)(struct device *, void *))
1233 static inline struct iommu_group *iommu_group_get(struct device *dev)
1238 static inline void iommu_group_put(struct iommu_group *group)
1242 static inline int iommu_group_id(struct iommu_group *group)
1247 static inline int iommu_set_pgtable_quirks(struct iommu_domain *domain,
1248 unsigned long quirks)
1253 static inline int iommu_device_register(struct iommu_device *iommu,
1254 const struct iommu_ops *ops,
1255 struct device *hwdev)
1260 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
1265 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
1269 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
1270 struct iommu_iotlb_gather *gather,
1271 unsigned long iova, size_t size)
1275 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
1280 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
1281 struct iova_bitmap *bitmap,
1282 struct iommu_iotlb_gather *gather)
1286 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
1288 unsigned long length)
1292 static inline void iommu_device_unregister(struct iommu_device *iommu)
1296 static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
1297 struct device *parent,
1298 const struct attribute_group **groups,
1299 const char *fmt, ...)
1304 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
1308 static inline int iommu_device_link(struct device *dev, struct device *link)
1313 static inline void iommu_device_unlink(struct device *dev, struct device *link)
1317 static inline int iommu_fwspec_init(struct device *dev,
1318 struct fwnode_handle *iommu_fwnode,
1319 const struct iommu_ops *ops)
1324 static inline void iommu_fwspec_free(struct device *dev)
1328 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
1335 const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode)
1341 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
1347 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1352 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1357 static inline int iommu_device_use_default_domain(struct device *dev)
1362 static inline void iommu_device_unuse_default_domain(struct device *dev)
1367 iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
1372 static inline void iommu_group_release_dma_owner(struct iommu_group *group)
1376 static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
1381 static inline void iommu_device_release_dma_owner(struct device *dev)
1385 static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
1390 static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
1391 struct device *dev, ioasid_t pasid)
1396 static inline void iommu_detach_device_pasid(struct iommu_domain *domain,
1397 struct device *dev, ioasid_t pasid)
1401 static inline struct iommu_domain *
1402 iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
1408 static inline ioasid_t iommu_alloc_global_pasid(struct device *dev)
1410 return IOMMU_PASID_INVALID;
1413 static inline void iommu_free_global_pasid(ioasid_t pasid) {}
1414 #endif /* CONFIG_IOMMU_API */
1416 #if IS_ENABLED(CONFIG_LOCKDEP) && IS_ENABLED(CONFIG_IOMMU_API)
1417 void iommu_group_mutex_assert(struct device *dev);
1419 static inline void iommu_group_mutex_assert(struct device *dev)
1425 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1426 * @domain: The IOMMU domain to perform the mapping
1427 * @iova: The start address to map the buffer
1428 * @sgt: The sg_table object describing the buffer
1429 * @prot: IOMMU protection bits
1431 * Creates a mapping at @iova for the buffer described by a scatterlist
1432 * stored in the given sg_table object in the provided IOMMU domain.
1434 static inline ssize_t iommu_map_sgtable(struct iommu_domain *domain,
1435 unsigned long iova, struct sg_table *sgt, int prot)
1437 return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,
1441 #ifdef CONFIG_IOMMU_DEBUGFS
1442 extern struct dentry *iommu_debugfs_dir;
1443 void iommu_debugfs_setup(void);
1445 static inline void iommu_debugfs_setup(void) {}
1448 #ifdef CONFIG_IOMMU_DMA
1449 #include <linux/msi.h>
1451 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
1453 int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
1454 void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg);
1456 #else /* CONFIG_IOMMU_DMA */
1461 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
1466 static inline int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
1471 static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
1475 #endif /* CONFIG_IOMMU_DMA */
1478 * Newer generations of Tegra SoCs require devices' stream IDs to be directly programmed into
1479 * some registers. These are always paired with a Tegra SMMU or ARM SMMU, for which the contents
1480 * of the struct iommu_fwspec are known. Use this helper to formalize access to these internals.
1482 #define TEGRA_STREAM_ID_BYPASS 0x7f
1484 static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream_id)
1486 #ifdef CONFIG_IOMMU_API
1487 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1489 if (fwspec && fwspec->num_ids == 1) {
1490 *stream_id = fwspec->ids[0] & 0xffff;
1498 #ifdef CONFIG_IOMMU_MM_DATA
1499 static inline void mm_pasid_init(struct mm_struct *mm)
1502 * During dup_mm(), a new mm will be memcpy'd from an old one and that makes
1503 * the new mm and the old one point to a same iommu_mm instance. When either
1504 * one of the two mms gets released, the iommu_mm instance is freed, leaving
1505 * the other mm running into a use-after-free/double-free problem. To avoid
1506 * the problem, zeroing the iommu_mm pointer of a new mm is needed here.
1508 mm->iommu_mm = NULL;
1511 static inline bool mm_valid_pasid(struct mm_struct *mm)
1513 return READ_ONCE(mm->iommu_mm);
1516 static inline u32 mm_get_enqcmd_pasid(struct mm_struct *mm)
1518 struct iommu_mm_data *iommu_mm = READ_ONCE(mm->iommu_mm);
1521 return IOMMU_PASID_INVALID;
1522 return iommu_mm->pasid;
1525 void mm_pasid_drop(struct mm_struct *mm);
1526 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
1527 struct mm_struct *mm);
1528 void iommu_sva_unbind_device(struct iommu_sva *handle);
1529 u32 iommu_sva_get_pasid(struct iommu_sva *handle);
1530 struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
1531 struct mm_struct *mm);
1533 static inline struct iommu_sva *
1534 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
1539 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1543 static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1545 return IOMMU_PASID_INVALID;
1547 static inline void mm_pasid_init(struct mm_struct *mm) {}
1548 static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
1550 static inline u32 mm_get_enqcmd_pasid(struct mm_struct *mm)
1552 return IOMMU_PASID_INVALID;
1555 static inline void mm_pasid_drop(struct mm_struct *mm) {}
1557 static inline struct iommu_domain *
1558 iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
1562 #endif /* CONFIG_IOMMU_SVA */
1564 #ifdef CONFIG_IOMMU_IOPF
1565 int iopf_queue_add_device(struct iopf_queue *queue, struct device *dev);
1566 void iopf_queue_remove_device(struct iopf_queue *queue, struct device *dev);
1567 int iopf_queue_flush_dev(struct device *dev);
1568 struct iopf_queue *iopf_queue_alloc(const char *name);
1569 void iopf_queue_free(struct iopf_queue *queue);
1570 int iopf_queue_discard_partial(struct iopf_queue *queue);
1571 void iopf_free_group(struct iopf_group *group);
1572 void iommu_report_device_fault(struct device *dev, struct iopf_fault *evt);
1573 void iopf_group_response(struct iopf_group *group,
1574 enum iommu_page_response_code status);
1577 iopf_queue_add_device(struct iopf_queue *queue, struct device *dev)
1583 iopf_queue_remove_device(struct iopf_queue *queue, struct device *dev)
1587 static inline int iopf_queue_flush_dev(struct device *dev)
1592 static inline struct iopf_queue *iopf_queue_alloc(const char *name)
1597 static inline void iopf_queue_free(struct iopf_queue *queue)
1601 static inline int iopf_queue_discard_partial(struct iopf_queue *queue)
1606 static inline void iopf_free_group(struct iopf_group *group)
1611 iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
1615 static inline void iopf_group_response(struct iopf_group *group,
1616 enum iommu_page_response_code status)
1619 #endif /* CONFIG_IOMMU_IOPF */
1620 #endif /* __LINUX_IOMMU_H */