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>
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_attach_handle *attach_handle;
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 /* Read but do not clear any dirty bits */
321 #define IOMMU_DIRTY_NO_CLEAR (1 << 0)
323 #ifdef CONFIG_IOMMU_API
326 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
328 * @start: IOVA representing the start of the range to be flushed
329 * @end: IOVA representing the end of the range to be flushed (inclusive)
330 * @pgsize: The interval at which to perform the flush
331 * @freelist: Removed pages to free after sync
332 * @queued: Indicates that the flush will be queued
334 * This structure is intended to be updated by multiple calls to the
335 * ->unmap() function in struct iommu_ops before eventually being passed
336 * into ->iotlb_sync(). Drivers can add pages to @freelist to be freed after
337 * ->iotlb_sync() or ->iotlb_flush_all() have cleared all cached references to
338 * them. @queued is set to indicate when ->iotlb_flush_all() will be called
339 * later instead of ->iotlb_sync(), so drivers may optimise accordingly.
341 struct iommu_iotlb_gather {
345 struct list_head freelist;
350 * struct iommu_dirty_bitmap - Dirty IOVA bitmap state
351 * @bitmap: IOVA bitmap
352 * @gather: Range information for a pending IOTLB flush
354 struct iommu_dirty_bitmap {
355 struct iova_bitmap *bitmap;
356 struct iommu_iotlb_gather *gather;
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.
550 * @user_pasid_table: IOMMU driver supports user-managed PASID table. There is
551 * no user domain for each PASID and the I/O page faults are
552 * forwarded through the user domain attached to the device
556 bool (*capable)(struct device *dev, enum iommu_cap);
557 void *(*hw_info)(struct device *dev, u32 *length, u32 *type);
559 /* Domain allocation and freeing by the iommu driver */
560 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
561 struct iommu_domain *(*domain_alloc_user)(
562 struct device *dev, u32 flags, struct iommu_domain *parent,
563 const struct iommu_user_data *user_data);
564 struct iommu_domain *(*domain_alloc_paging)(struct device *dev);
565 struct iommu_domain *(*domain_alloc_sva)(struct device *dev,
566 struct mm_struct *mm);
568 struct iommu_device *(*probe_device)(struct device *dev);
569 void (*release_device)(struct device *dev);
570 void (*probe_finalize)(struct device *dev);
571 struct iommu_group *(*device_group)(struct device *dev);
573 /* Request/Free a list of reserved regions for a device */
574 void (*get_resv_regions)(struct device *dev, struct list_head *list);
576 int (*of_xlate)(struct device *dev, const struct of_phandle_args *args);
577 bool (*is_attach_deferred)(struct device *dev);
579 /* Per device IOMMU features */
580 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
581 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
583 void (*page_response)(struct device *dev, struct iopf_fault *evt,
584 struct iommu_page_response *msg);
586 int (*def_domain_type)(struct device *dev);
587 void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid,
588 struct iommu_domain *domain);
590 const struct iommu_domain_ops *default_domain_ops;
591 unsigned long pgsize_bitmap;
592 struct module *owner;
593 struct iommu_domain *identity_domain;
594 struct iommu_domain *blocked_domain;
595 struct iommu_domain *release_domain;
596 struct iommu_domain *default_domain;
597 u8 user_pasid_table:1;
601 * struct iommu_domain_ops - domain specific operations
602 * @attach_dev: attach an iommu domain to a device
605 * * EINVAL - can indicate that device and domain are incompatible due to
606 * some previous configuration of the domain, in which case the
607 * driver shouldn't log an error, since it is legitimate for a
608 * caller to test reuse of existing domains. Otherwise, it may
609 * still represent some other fundamental problem
610 * * ENOMEM - out of memory
611 * * ENOSPC - non-ENOMEM type of resource allocation failures
612 * * EBUSY - device is attached to a domain and cannot be changed
613 * * ENODEV - device specific errors, not able to be attached
614 * * <others> - treated as ENODEV by the caller. Use is discouraged
615 * @set_dev_pasid: set an iommu domain to a pasid of device
616 * @map_pages: map a physically contiguous set of pages of the same size to
618 * @unmap_pages: unmap a number of pages of the same size from an iommu domain
619 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
620 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
621 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
623 * @cache_invalidate_user: Flush hardware cache for user space IO page table.
624 * The @domain must be IOMMU_DOMAIN_NESTED. The @array
625 * passes in the cache invalidation requests, in form
626 * of a driver data structure. The driver must update
627 * array->entry_num to report the number of handled
628 * invalidation requests. The driver data structure
629 * must be defined in include/uapi/linux/iommufd.h
630 * @iova_to_phys: translate iova to physical address
631 * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
632 * including no-snoop TLPs on PCIe or other platform
633 * specific mechanisms.
634 * @enable_nesting: Enable nesting
635 * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
636 * @free: Release the domain after use.
638 struct iommu_domain_ops {
639 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
640 int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
643 int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
644 phys_addr_t paddr, size_t pgsize, size_t pgcount,
645 int prot, gfp_t gfp, size_t *mapped);
646 size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
647 size_t pgsize, size_t pgcount,
648 struct iommu_iotlb_gather *iotlb_gather);
650 void (*flush_iotlb_all)(struct iommu_domain *domain);
651 int (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
653 void (*iotlb_sync)(struct iommu_domain *domain,
654 struct iommu_iotlb_gather *iotlb_gather);
655 int (*cache_invalidate_user)(struct iommu_domain *domain,
656 struct iommu_user_data_array *array);
658 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
661 bool (*enforce_cache_coherency)(struct iommu_domain *domain);
662 int (*enable_nesting)(struct iommu_domain *domain);
663 int (*set_pgtable_quirks)(struct iommu_domain *domain,
664 unsigned long quirks);
666 void (*free)(struct iommu_domain *domain);
670 * struct iommu_device - IOMMU core representation of one IOMMU hardware
672 * @list: Used by the iommu-core to keep a list of registered iommus
673 * @ops: iommu-ops for talking to this iommu
674 * @dev: struct device for sysfs handling
675 * @singleton_group: Used internally for drivers that have only one group
676 * @max_pasids: number of supported PASIDs
678 struct iommu_device {
679 struct list_head list;
680 const struct iommu_ops *ops;
681 struct fwnode_handle *fwnode;
683 struct iommu_group *singleton_group;
688 * struct iommu_fault_param - per-device IOMMU fault data
689 * @lock: protect pending faults list
690 * @users: user counter to manage the lifetime of the data
691 * @rcu: rcu head for kfree_rcu()
692 * @dev: the device that owns this param
694 * @queue_list: index into queue->devices
695 * @partial: faults that are part of a Page Request Group for which the last
696 * request hasn't been submitted yet.
697 * @faults: holds the pending faults which need response
699 struct iommu_fault_param {
705 struct iopf_queue *queue;
706 struct list_head queue_list;
708 struct list_head partial;
709 struct list_head faults;
713 * struct dev_iommu - Collection of per-device IOMMU data
715 * @fault_param: IOMMU detected device fault reporting data
716 * @fwspec: IOMMU fwspec data
717 * @iommu_dev: IOMMU device this device is linked to
718 * @priv: IOMMU Driver private data
719 * @max_pasids: number of PASIDs this device can consume
720 * @attach_deferred: the dma domain attachment is deferred
721 * @pci_32bit_workaround: Limit DMA allocations to 32-bit IOVAs
722 * @require_direct: device requires IOMMU_RESV_DIRECT regions
723 * @shadow_on_flush: IOTLB flushes are used to sync shadow tables
725 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
726 * struct iommu_group *iommu_group;
730 struct iommu_fault_param __rcu *fault_param;
731 struct iommu_fwspec *fwspec;
732 struct iommu_device *iommu_dev;
735 u32 attach_deferred:1;
736 u32 pci_32bit_workaround:1;
737 u32 require_direct:1;
738 u32 shadow_on_flush:1;
741 int iommu_device_register(struct iommu_device *iommu,
742 const struct iommu_ops *ops,
743 struct device *hwdev);
744 void iommu_device_unregister(struct iommu_device *iommu);
745 int iommu_device_sysfs_add(struct iommu_device *iommu,
746 struct device *parent,
747 const struct attribute_group **groups,
748 const char *fmt, ...) __printf(4, 5);
749 void iommu_device_sysfs_remove(struct iommu_device *iommu);
750 int iommu_device_link(struct iommu_device *iommu, struct device *link);
751 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
752 int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
754 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
756 return (struct iommu_device *)dev_get_drvdata(dev);
760 * iommu_get_iommu_dev - Get iommu_device for a device
761 * @dev: an end-point device
763 * Note that this function must be called from the iommu_ops
764 * to retrieve the iommu_device for a device, which the core code
765 * guarentees it will not invoke the op without an attached iommu.
767 static inline struct iommu_device *__iommu_get_iommu_dev(struct device *dev)
769 return dev->iommu->iommu_dev;
772 #define iommu_get_iommu_dev(dev, type, member) \
773 container_of(__iommu_get_iommu_dev(dev), type, member)
775 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
777 *gather = (struct iommu_iotlb_gather) {
779 .freelist = LIST_HEAD_INIT(gather->freelist),
783 extern int bus_iommu_probe(const struct bus_type *bus);
784 extern bool iommu_present(const struct bus_type *bus);
785 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
786 extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
787 extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
788 struct iommu_domain *iommu_paging_domain_alloc(struct device *dev);
789 extern void iommu_domain_free(struct iommu_domain *domain);
790 extern int iommu_attach_device(struct iommu_domain *domain,
792 extern void iommu_detach_device(struct iommu_domain *domain,
794 extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
795 struct device *dev, ioasid_t pasid);
796 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
797 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
798 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
799 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
800 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
802 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
803 unsigned long iova, size_t size,
804 struct iommu_iotlb_gather *iotlb_gather);
805 extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
806 struct scatterlist *sg, unsigned int nents,
807 int prot, gfp_t gfp);
808 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
809 extern void iommu_set_fault_handler(struct iommu_domain *domain,
810 iommu_fault_handler_t handler, void *token);
812 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
813 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
814 extern void iommu_set_default_passthrough(bool cmd_line);
815 extern void iommu_set_default_translated(bool cmd_line);
816 extern bool iommu_default_passthrough(void);
817 extern struct iommu_resv_region *
818 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
819 enum iommu_resv_type type, gfp_t gfp);
820 extern int iommu_get_group_resv_regions(struct iommu_group *group,
821 struct list_head *head);
823 extern int iommu_attach_group(struct iommu_domain *domain,
824 struct iommu_group *group);
825 extern void iommu_detach_group(struct iommu_domain *domain,
826 struct iommu_group *group);
827 extern struct iommu_group *iommu_group_alloc(void);
828 extern void *iommu_group_get_iommudata(struct iommu_group *group);
829 extern void iommu_group_set_iommudata(struct iommu_group *group,
831 void (*release)(void *iommu_data));
832 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
833 extern int iommu_group_add_device(struct iommu_group *group,
835 extern void iommu_group_remove_device(struct device *dev);
836 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
837 int (*fn)(struct device *, void *));
838 extern struct iommu_group *iommu_group_get(struct device *dev);
839 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
840 extern void iommu_group_put(struct iommu_group *group);
842 extern int iommu_group_id(struct iommu_group *group);
843 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
845 int iommu_enable_nesting(struct iommu_domain *domain);
846 int iommu_set_pgtable_quirks(struct iommu_domain *domain,
847 unsigned long quirks);
849 void iommu_set_dma_strict(void);
851 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
852 unsigned long iova, int flags);
854 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
856 if (domain->ops->flush_iotlb_all)
857 domain->ops->flush_iotlb_all(domain);
860 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
861 struct iommu_iotlb_gather *iotlb_gather)
863 if (domain->ops->iotlb_sync)
864 domain->ops->iotlb_sync(domain, iotlb_gather);
866 iommu_iotlb_gather_init(iotlb_gather);
870 * iommu_iotlb_gather_is_disjoint - Checks whether a new range is disjoint
872 * @gather: TLB gather data
873 * @iova: start of page to invalidate
874 * @size: size of page to invalidate
876 * Helper for IOMMU drivers to check whether a new range and the gathered range
877 * are disjoint. For many IOMMUs, flushing the IOMMU in this case is better
878 * than merging the two, which might lead to unnecessary invalidations.
881 bool iommu_iotlb_gather_is_disjoint(struct iommu_iotlb_gather *gather,
882 unsigned long iova, size_t size)
884 unsigned long start = iova, end = start + size - 1;
886 return gather->end != 0 &&
887 (end + 1 < gather->start || start > gather->end + 1);
892 * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation
893 * @gather: TLB gather data
894 * @iova: start of page to invalidate
895 * @size: size of page to invalidate
897 * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands
898 * where only the address range matters, and simply minimising intermediate
899 * syncs is preferred.
901 static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather,
902 unsigned long iova, size_t size)
904 unsigned long end = iova + size - 1;
906 if (gather->start > iova)
907 gather->start = iova;
908 if (gather->end < end)
913 * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation
914 * @domain: IOMMU domain to be invalidated
915 * @gather: TLB gather data
916 * @iova: start of page to invalidate
917 * @size: size of page to invalidate
919 * Helper for IOMMU drivers to build invalidation commands based on individual
920 * pages, or with page size/table level hints which cannot be gathered if they
923 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
924 struct iommu_iotlb_gather *gather,
925 unsigned long iova, size_t size)
928 * If the new page is disjoint from the current range or is mapped at
929 * a different granularity, then sync the TLB so that the gather
930 * structure can be rewritten.
932 if ((gather->pgsize && gather->pgsize != size) ||
933 iommu_iotlb_gather_is_disjoint(gather, iova, size))
934 iommu_iotlb_sync(domain, gather);
936 gather->pgsize = size;
937 iommu_iotlb_gather_add_range(gather, iova, size);
940 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
942 return gather && gather->queued;
945 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
946 struct iova_bitmap *bitmap,
947 struct iommu_iotlb_gather *gather)
950 iommu_iotlb_gather_init(gather);
952 dirty->bitmap = bitmap;
953 dirty->gather = gather;
956 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
958 unsigned long length)
961 iova_bitmap_set(dirty->bitmap, iova, length);
964 iommu_iotlb_gather_add_range(dirty->gather, iova, length);
967 /* PCI device grouping function */
968 extern struct iommu_group *pci_device_group(struct device *dev);
969 /* Generic device grouping function */
970 extern struct iommu_group *generic_device_group(struct device *dev);
971 /* FSL-MC device grouping function */
972 struct iommu_group *fsl_mc_device_group(struct device *dev);
973 extern struct iommu_group *generic_single_device_group(struct device *dev);
976 * struct iommu_fwspec - per-device IOMMU instance data
977 * @iommu_fwnode: firmware handle for this device's IOMMU
978 * @flags: IOMMU_FWSPEC_* flags
979 * @num_ids: number of associated device IDs
980 * @ids: IDs which this device may present to the IOMMU
982 * Note that the IDs (and any other information, really) stored in this structure should be
983 * considered private to the IOMMU device driver and are not to be used directly by IOMMU
986 struct iommu_fwspec {
987 struct fwnode_handle *iommu_fwnode;
989 unsigned int num_ids;
993 /* ATS is supported */
994 #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
997 * An iommu attach handle represents a relationship between an iommu domain
998 * and a PASID or RID of a device. It is allocated and managed by the component
999 * that manages the domain and is stored in the iommu group during the time the
1000 * domain is attached.
1002 struct iommu_attach_handle {
1003 struct iommu_domain *domain;
1007 * struct iommu_sva - handle to a device-mm bond
1010 struct iommu_attach_handle handle;
1015 struct iommu_mm_data {
1017 struct list_head sva_domains;
1020 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode);
1021 void iommu_fwspec_free(struct device *dev);
1022 int iommu_fwspec_add_ids(struct device *dev, const u32 *ids, int num_ids);
1024 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1027 return dev->iommu->fwspec;
1032 static inline void dev_iommu_fwspec_set(struct device *dev,
1033 struct iommu_fwspec *fwspec)
1035 dev->iommu->fwspec = fwspec;
1038 static inline void *dev_iommu_priv_get(struct device *dev)
1041 return dev->iommu->priv;
1046 void dev_iommu_priv_set(struct device *dev, void *priv);
1048 extern struct mutex iommu_probe_device_lock;
1049 int iommu_probe_device(struct device *dev);
1051 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
1052 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
1054 int iommu_device_use_default_domain(struct device *dev);
1055 void iommu_device_unuse_default_domain(struct device *dev);
1057 int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
1058 void iommu_group_release_dma_owner(struct iommu_group *group);
1059 bool iommu_group_dma_owner_claimed(struct iommu_group *group);
1061 int iommu_device_claim_dma_owner(struct device *dev, void *owner);
1062 void iommu_device_release_dma_owner(struct device *dev);
1064 int iommu_attach_device_pasid(struct iommu_domain *domain,
1065 struct device *dev, ioasid_t pasid,
1066 struct iommu_attach_handle *handle);
1067 void iommu_detach_device_pasid(struct iommu_domain *domain,
1068 struct device *dev, ioasid_t pasid);
1069 ioasid_t iommu_alloc_global_pasid(struct device *dev);
1070 void iommu_free_global_pasid(ioasid_t pasid);
1071 #else /* CONFIG_IOMMU_API */
1073 struct iommu_ops {};
1074 struct iommu_group {};
1075 struct iommu_fwspec {};
1076 struct iommu_device {};
1077 struct iommu_fault_param {};
1078 struct iommu_iotlb_gather {};
1079 struct iommu_dirty_bitmap {};
1080 struct iommu_dirty_ops {};
1082 static inline bool iommu_present(const struct bus_type *bus)
1087 static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
1092 static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
1097 static inline struct iommu_domain *iommu_paging_domain_alloc(struct device *dev)
1099 return ERR_PTR(-ENODEV);
1102 static inline void iommu_domain_free(struct iommu_domain *domain)
1106 static inline int iommu_attach_device(struct iommu_domain *domain,
1112 static inline void iommu_detach_device(struct iommu_domain *domain,
1117 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
1122 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
1123 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
1128 static inline size_t iommu_unmap(struct iommu_domain *domain,
1129 unsigned long iova, size_t size)
1134 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
1135 unsigned long iova, int gfp_order,
1136 struct iommu_iotlb_gather *iotlb_gather)
1141 static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
1142 unsigned long iova, struct scatterlist *sg,
1143 unsigned int nents, int prot, gfp_t gfp)
1148 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
1152 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
1153 struct iommu_iotlb_gather *iotlb_gather)
1157 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
1162 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
1163 iommu_fault_handler_t handler, void *token)
1167 static inline void iommu_get_resv_regions(struct device *dev,
1168 struct list_head *list)
1172 static inline void iommu_put_resv_regions(struct device *dev,
1173 struct list_head *list)
1177 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
1178 struct list_head *head)
1183 static inline void iommu_set_default_passthrough(bool cmd_line)
1187 static inline void iommu_set_default_translated(bool cmd_line)
1191 static inline bool iommu_default_passthrough(void)
1196 static inline int iommu_attach_group(struct iommu_domain *domain,
1197 struct iommu_group *group)
1202 static inline void iommu_detach_group(struct iommu_domain *domain,
1203 struct iommu_group *group)
1207 static inline struct iommu_group *iommu_group_alloc(void)
1209 return ERR_PTR(-ENODEV);
1212 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
1217 static inline void iommu_group_set_iommudata(struct iommu_group *group,
1219 void (*release)(void *iommu_data))
1223 static inline int iommu_group_set_name(struct iommu_group *group,
1229 static inline int iommu_group_add_device(struct iommu_group *group,
1235 static inline void iommu_group_remove_device(struct device *dev)
1239 static inline int iommu_group_for_each_dev(struct iommu_group *group,
1241 int (*fn)(struct device *, void *))
1246 static inline struct iommu_group *iommu_group_get(struct device *dev)
1251 static inline void iommu_group_put(struct iommu_group *group)
1255 static inline int iommu_group_id(struct iommu_group *group)
1260 static inline int iommu_set_pgtable_quirks(struct iommu_domain *domain,
1261 unsigned long quirks)
1266 static inline int iommu_device_register(struct iommu_device *iommu,
1267 const struct iommu_ops *ops,
1268 struct device *hwdev)
1273 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
1278 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
1282 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
1283 struct iommu_iotlb_gather *gather,
1284 unsigned long iova, size_t size)
1288 static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
1293 static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
1294 struct iova_bitmap *bitmap,
1295 struct iommu_iotlb_gather *gather)
1299 static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
1301 unsigned long length)
1305 static inline void iommu_device_unregister(struct iommu_device *iommu)
1309 static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
1310 struct device *parent,
1311 const struct attribute_group **groups,
1312 const char *fmt, ...)
1317 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
1321 static inline int iommu_device_link(struct device *dev, struct device *link)
1326 static inline void iommu_device_unlink(struct device *dev, struct device *link)
1330 static inline int iommu_fwspec_init(struct device *dev,
1331 struct fwnode_handle *iommu_fwnode)
1336 static inline void iommu_fwspec_free(struct device *dev)
1340 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
1347 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
1353 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1358 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1363 static inline int iommu_device_use_default_domain(struct device *dev)
1368 static inline void iommu_device_unuse_default_domain(struct device *dev)
1373 iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
1378 static inline void iommu_group_release_dma_owner(struct iommu_group *group)
1382 static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
1387 static inline void iommu_device_release_dma_owner(struct device *dev)
1391 static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
1396 static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
1397 struct device *dev, ioasid_t pasid,
1398 struct iommu_attach_handle *handle)
1403 static inline void iommu_detach_device_pasid(struct iommu_domain *domain,
1404 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);
1531 static inline struct iommu_sva *
1532 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
1534 return ERR_PTR(-ENODEV);
1537 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1541 static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1543 return IOMMU_PASID_INVALID;
1545 static inline void mm_pasid_init(struct mm_struct *mm) {}
1546 static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
1548 static inline u32 mm_get_enqcmd_pasid(struct mm_struct *mm)
1550 return IOMMU_PASID_INVALID;
1553 static inline void mm_pasid_drop(struct mm_struct *mm) {}
1554 #endif /* CONFIG_IOMMU_SVA */
1556 #ifdef CONFIG_IOMMU_IOPF
1557 int iopf_queue_add_device(struct iopf_queue *queue, struct device *dev);
1558 void iopf_queue_remove_device(struct iopf_queue *queue, struct device *dev);
1559 int iopf_queue_flush_dev(struct device *dev);
1560 struct iopf_queue *iopf_queue_alloc(const char *name);
1561 void iopf_queue_free(struct iopf_queue *queue);
1562 int iopf_queue_discard_partial(struct iopf_queue *queue);
1563 void iopf_free_group(struct iopf_group *group);
1564 void iommu_report_device_fault(struct device *dev, struct iopf_fault *evt);
1565 void iopf_group_response(struct iopf_group *group,
1566 enum iommu_page_response_code status);
1569 iopf_queue_add_device(struct iopf_queue *queue, struct device *dev)
1575 iopf_queue_remove_device(struct iopf_queue *queue, struct device *dev)
1579 static inline int iopf_queue_flush_dev(struct device *dev)
1584 static inline struct iopf_queue *iopf_queue_alloc(const char *name)
1589 static inline void iopf_queue_free(struct iopf_queue *queue)
1593 static inline int iopf_queue_discard_partial(struct iopf_queue *queue)
1598 static inline void iopf_free_group(struct iopf_group *group)
1603 iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
1607 static inline void iopf_group_response(struct iopf_group *group,
1608 enum iommu_page_response_code status)
1611 #endif /* CONFIG_IOMMU_IOPF */
1612 #endif /* __LINUX_IOMMU_H */