1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <joerg.roedel@amd.com>
5 */
6
7#ifndef __LINUX_IOMMU_H
8#define __LINUX_IOMMU_H
9
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>
15#include <linux/of.h>
16#include <linux/iova_bitmap.h>
17#include <uapi/linux/iommu.h>
18
19#define IOMMU_READ (1 << 0)
20#define IOMMU_WRITE (1 << 1)
21#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
22#define IOMMU_NOEXEC (1 << 3)
23#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
24/*
25 * Where the bus hardware includes a privilege level as part of its access type
26 * markings, and certain devices are capable of issuing transactions marked as
27 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
28 * given permission flags only apply to accesses at the higher privilege level,
29 * and that unprivileged transactions should have as little access as possible.
30 * This would usually imply the same permissions as kernel mappings on the CPU,
31 * if the IOMMU page table format is equivalent.
32 */
33#define IOMMU_PRIV (1 << 5)
34
35struct iommu_ops;
36struct iommu_group;
37struct bus_type;
38struct device;
39struct iommu_domain;
40struct iommu_domain_ops;
41struct iommu_dirty_ops;
42struct notifier_block;
43struct iommu_sva;
44struct iommu_fault_event;
45struct iommu_dma_cookie;
46
47/* iommu fault flags */
48#define IOMMU_FAULT_READ 0x0
49#define IOMMU_FAULT_WRITE 0x1
50
51typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
52 struct device *, unsigned long, int, void *);
53typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);
54
55struct iommu_domain_geometry {
56 dma_addr_t aperture_start; /* First address that can be mapped */
57 dma_addr_t aperture_end; /* Last address that can be mapped */
58 bool force_aperture; /* DMA only allowed in mappable range? */
59};
60
61/* Domain feature flags */
62#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
63#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
64 implementation */
65#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
66#define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */
67
68#define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */
69
70#define __IOMMU_DOMAIN_NESTED (1U << 6) /* User-managed address space nested
71 on a stage-2 translation */
72
73#define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ
74/*
75 * This are the possible domain-types
76 *
77 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
78 * devices
79 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
80 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
81 * for VMs
82 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
83 * This flag allows IOMMU drivers to implement
84 * certain optimizations for these domains
85 * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB
86 * invalidation.
87 * IOMMU_DOMAIN_SVA - DMA addresses are shared process addresses
88 * represented by mm_struct's.
89 */
90#define IOMMU_DOMAIN_BLOCKED (0U)
91#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
92#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
93#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
94 __IOMMU_DOMAIN_DMA_API)
95#define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \
96 __IOMMU_DOMAIN_DMA_API | \
97 __IOMMU_DOMAIN_DMA_FQ)
98#define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA)
99#define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED)
100
101struct iommu_domain {
102 unsigned type;
103 const struct iommu_domain_ops *ops;
104 const struct iommu_dirty_ops *dirty_ops;
105
106 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
107 struct iommu_domain_geometry geometry;
108 struct iommu_dma_cookie *iova_cookie;
109 enum iommu_page_response_code (*iopf_handler)(struct iommu_fault *fault,
110 void *data);
111 void *fault_data;
112 union {
113 struct {
114 iommu_fault_handler_t handler;
115 void *handler_token;
116 };
117 struct { /* IOMMU_DOMAIN_SVA */
118 struct mm_struct *mm;
119 int users;
120 };
121 };
122};
123
124static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
125{
126 return domain->type & __IOMMU_DOMAIN_DMA_API;
127}
128
129enum iommu_cap {
130 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU_CACHE is supported */
131 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
132 IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
133 DMA protection and we should too */
134 /*
135 * Per-device flag indicating if enforce_cache_coherency() will work on
136 * this device.
137 */
138 IOMMU_CAP_ENFORCE_CACHE_COHERENCY,
139 /*
140 * IOMMU driver does not issue TLB maintenance during .unmap, so can
141 * usefully support the non-strict DMA flush queue.
142 */
143 IOMMU_CAP_DEFERRED_FLUSH,
144 IOMMU_CAP_DIRTY_TRACKING, /* IOMMU supports dirty tracking */
145};
146
147/* These are the possible reserved region types */
148enum iommu_resv_type {
149 /* Memory regions which must be mapped 1:1 at all times */
150 IOMMU_RESV_DIRECT,
151 /*
152 * Memory regions which are advertised to be 1:1 but are
153 * commonly considered relaxable in some conditions,
154 * for instance in device assignment use case (USB, Graphics)
155 */
156 IOMMU_RESV_DIRECT_RELAXABLE,
157 /* Arbitrary "never map this or give it to a device" address ranges */
158 IOMMU_RESV_RESERVED,
159 /* Hardware MSI region (untranslated) */
160 IOMMU_RESV_MSI,
161 /* Software-managed MSI translation window */
162 IOMMU_RESV_SW_MSI,
163};
164
165/**
166 * struct iommu_resv_region - descriptor for a reserved memory region
167 * @list: Linked list pointers
168 * @start: System physical start address of the region
169 * @length: Length of the region in bytes
170 * @prot: IOMMU Protection flags (READ/WRITE/...)
171 * @type: Type of the reserved region
172 * @free: Callback to free associated memory allocations
173 */
174struct iommu_resv_region {
175 struct list_head list;
176 phys_addr_t start;
177 size_t length;
178 int prot;
179 enum iommu_resv_type type;
180 void (*free)(struct device *dev, struct iommu_resv_region *region);
181};
182
183struct iommu_iort_rmr_data {
184 struct iommu_resv_region rr;
185
186 /* Stream IDs associated with IORT RMR entry */
187 const u32 *sids;
188 u32 num_sids;
189};
190
191/**
192 * enum iommu_dev_features - Per device IOMMU features
193 * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
194 * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
195 * enabling %IOMMU_DEV_FEAT_SVA requires
196 * %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
197 * Faults themselves instead of relying on the IOMMU. When
198 * supported, this feature must be enabled before and
199 * disabled after %IOMMU_DEV_FEAT_SVA.
200 *
201 * Device drivers enable a feature using iommu_dev_enable_feature().
202 */
203enum iommu_dev_features {
204 IOMMU_DEV_FEAT_SVA,
205 IOMMU_DEV_FEAT_IOPF,
206};
207
208#define IOMMU_NO_PASID (0U) /* Reserved for DMA w/o PASID */
209#define IOMMU_FIRST_GLOBAL_PASID (1U) /*starting range for allocation */
210#define IOMMU_PASID_INVALID (-1U)
211typedef unsigned int ioasid_t;
212
213#ifdef CONFIG_IOMMU_API
214
215/**
216 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
217 *
218 * @start: IOVA representing the start of the range to be flushed
219 * @end: IOVA representing the end of the range to be flushed (inclusive)
220 * @pgsize: The interval at which to perform the flush
221 * @freelist: Removed pages to free after sync
222 * @queued: Indicates that the flush will be queued
223 *
224 * This structure is intended to be updated by multiple calls to the
225 * ->unmap() function in struct iommu_ops before eventually being passed
226 * into ->iotlb_sync(). Drivers can add pages to @freelist to be freed after
227 * ->iotlb_sync() or ->iotlb_flush_all() have cleared all cached references to
228 * them. @queued is set to indicate when ->iotlb_flush_all() will be called
229 * later instead of ->iotlb_sync(), so drivers may optimise accordingly.
230 */
231struct iommu_iotlb_gather {
232 unsigned long start;
233 unsigned long end;
234 size_t pgsize;
235 struct list_head freelist;
236 bool queued;
237};
238
239/**
240 * struct iommu_dirty_bitmap - Dirty IOVA bitmap state
241 * @bitmap: IOVA bitmap
242 * @gather: Range information for a pending IOTLB flush
243 */
244struct iommu_dirty_bitmap {
245 struct iova_bitmap *bitmap;
246 struct iommu_iotlb_gather *gather;
247};
248
249/* Read but do not clear any dirty bits */
250#define IOMMU_DIRTY_NO_CLEAR (1 << 0)
251
252/**
253 * struct iommu_dirty_ops - domain specific dirty tracking operations
254 * @set_dirty_tracking: Enable or Disable dirty tracking on the iommu domain
255 * @read_and_clear_dirty: Walk IOMMU page tables for dirtied PTEs marshalled
256 * into a bitmap, with a bit represented as a page.
257 * Reads the dirty PTE bits and clears it from IO
258 * pagetables.
259 */
260struct iommu_dirty_ops {
261 int (*set_dirty_tracking)(struct iommu_domain *domain, bool enabled);
262 int (*read_and_clear_dirty)(struct iommu_domain *domain,
263 unsigned long iova, size_t size,
264 unsigned long flags,
265 struct iommu_dirty_bitmap *dirty);
266};
267
268/**
269 * struct iommu_user_data - iommu driver specific user space data info
270 * @type: The data type of the user buffer
271 * @uptr: Pointer to the user buffer for copy_from_user()
272 * @len: The length of the user buffer in bytes
273 *
274 * A user space data is an uAPI that is defined in include/uapi/linux/iommufd.h
275 * @type, @uptr and @len should be just copied from an iommufd core uAPI struct.
276 */
277struct iommu_user_data {
278 unsigned int type;
279 void __user *uptr;
280 size_t len;
281};
282
283/**
284 * __iommu_copy_struct_from_user - Copy iommu driver specific user space data
285 * @dst_data: Pointer to an iommu driver specific user data that is defined in
286 * include/uapi/linux/iommufd.h
287 * @src_data: Pointer to a struct iommu_user_data for user space data info
288 * @data_type: The data type of the @dst_data. Must match with @src_data.type
289 * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
290 * @min_len: Initial length of user data structure for backward compatibility.
291 * This should be offsetofend using the last member in the user data
292 * struct that was initially added to include/uapi/linux/iommufd.h
293 */
294static inline int __iommu_copy_struct_from_user(
295 void *dst_data, const struct iommu_user_data *src_data,
296 unsigned int data_type, size_t data_len, size_t min_len)
297{
298 if (src_data->type != data_type)
299 return -EINVAL;
300 if (WARN_ON(!dst_data || !src_data))
301 return -EINVAL;
302 if (src_data->len < min_len || data_len < src_data->len)
303 return -EINVAL;
304 return copy_struct_from_user(dst: dst_data, ksize: data_len, src: src_data->uptr,
305 usize: src_data->len);
306}
307
308/**
309 * iommu_copy_struct_from_user - Copy iommu driver specific user space data
310 * @kdst: Pointer to an iommu driver specific user data that is defined in
311 * include/uapi/linux/iommufd.h
312 * @user_data: Pointer to a struct iommu_user_data for user space data info
313 * @data_type: The data type of the @kdst. Must match with @user_data->type
314 * @min_last: The last memember of the data structure @kdst points in the
315 * initial version.
316 * Return 0 for success, otherwise -error.
317 */
318#define iommu_copy_struct_from_user(kdst, user_data, data_type, min_last) \
319 __iommu_copy_struct_from_user(kdst, user_data, data_type, \
320 sizeof(*kdst), \
321 offsetofend(typeof(*kdst), min_last))
322
323/**
324 * struct iommu_ops - iommu ops and capabilities
325 * @capable: check capability
326 * @hw_info: report iommu hardware information. The data buffer returned by this
327 * op is allocated in the iommu driver and freed by the caller after
328 * use. The information type is one of enum iommu_hw_info_type defined
329 * in include/uapi/linux/iommufd.h.
330 * @domain_alloc: allocate and return an iommu domain if success. Otherwise
331 * NULL is returned. The domain is not fully initialized until
332 * the caller iommu_domain_alloc() returns.
333 * @domain_alloc_user: Allocate an iommu domain corresponding to the input
334 * parameters as defined in include/uapi/linux/iommufd.h.
335 * Unlike @domain_alloc, it is called only by IOMMUFD and
336 * must fully initialize the new domain before return.
337 * Upon success, if the @user_data is valid and the @parent
338 * points to a kernel-managed domain, the new domain must be
339 * IOMMU_DOMAIN_NESTED type; otherwise, the @parent must be
340 * NULL while the @user_data can be optionally provided, the
341 * new domain must support __IOMMU_DOMAIN_PAGING.
342 * Upon failure, ERR_PTR must be returned.
343 * @probe_device: Add device to iommu driver handling
344 * @release_device: Remove device from iommu driver handling
345 * @probe_finalize: Do final setup work after the device is added to an IOMMU
346 * group and attached to the groups domain
347 * @set_platform_dma_ops: Returning control back to the platform DMA ops. This op
348 * is to support old IOMMU drivers, new drivers should use
349 * default domains, and the common IOMMU DMA ops.
350 * @device_group: find iommu group for a particular device
351 * @get_resv_regions: Request list of reserved regions for a device
352 * @of_xlate: add OF master IDs to iommu grouping
353 * @is_attach_deferred: Check if domain attach should be deferred from iommu
354 * driver init to device driver init (default no)
355 * @dev_enable/disable_feat: per device entries to enable/disable
356 * iommu specific features.
357 * @page_response: handle page request response
358 * @def_domain_type: device default domain type, return value:
359 * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
360 * - IOMMU_DOMAIN_DMA: must use a dma domain
361 * - 0: use the default setting
362 * @default_domain_ops: the default ops for domains
363 * @remove_dev_pasid: Remove any translation configurations of a specific
364 * pasid, so that any DMA transactions with this pasid
365 * will be blocked by the hardware.
366 * @pgsize_bitmap: bitmap of all possible supported page sizes
367 * @owner: Driver module providing these ops
368 */
369struct iommu_ops {
370 bool (*capable)(struct device *dev, enum iommu_cap);
371 void *(*hw_info)(struct device *dev, u32 *length, u32 *type);
372
373 /* Domain allocation and freeing by the iommu driver */
374 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
375 struct iommu_domain *(*domain_alloc_user)(
376 struct device *dev, u32 flags, struct iommu_domain *parent,
377 const struct iommu_user_data *user_data);
378
379 struct iommu_device *(*probe_device)(struct device *dev);
380 void (*release_device)(struct device *dev);
381 void (*probe_finalize)(struct device *dev);
382 void (*set_platform_dma_ops)(struct device *dev);
383 struct iommu_group *(*device_group)(struct device *dev);
384
385 /* Request/Free a list of reserved regions for a device */
386 void (*get_resv_regions)(struct device *dev, struct list_head *list);
387
388 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
389 bool (*is_attach_deferred)(struct device *dev);
390
391 /* Per device IOMMU features */
392 int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
393 int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
394
395 int (*page_response)(struct device *dev,
396 struct iommu_fault_event *evt,
397 struct iommu_page_response *msg);
398
399 int (*def_domain_type)(struct device *dev);
400 void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
401
402 const struct iommu_domain_ops *default_domain_ops;
403 unsigned long pgsize_bitmap;
404 struct module *owner;
405};
406
407/**
408 * struct iommu_domain_ops - domain specific operations
409 * @attach_dev: attach an iommu domain to a device
410 * Return:
411 * * 0 - success
412 * * EINVAL - can indicate that device and domain are incompatible due to
413 * some previous configuration of the domain, in which case the
414 * driver shouldn't log an error, since it is legitimate for a
415 * caller to test reuse of existing domains. Otherwise, it may
416 * still represent some other fundamental problem
417 * * ENOMEM - out of memory
418 * * ENOSPC - non-ENOMEM type of resource allocation failures
419 * * EBUSY - device is attached to a domain and cannot be changed
420 * * ENODEV - device specific errors, not able to be attached
421 * * <others> - treated as ENODEV by the caller. Use is discouraged
422 * @set_dev_pasid: set an iommu domain to a pasid of device
423 * @map: map a physically contiguous memory region to an iommu domain
424 * @map_pages: map a physically contiguous set of pages of the same size to
425 * an iommu domain.
426 * @unmap: unmap a physically contiguous memory region from an iommu domain
427 * @unmap_pages: unmap a number of pages of the same size from an iommu domain
428 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
429 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
430 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
431 * queue
432 * @iova_to_phys: translate iova to physical address
433 * @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
434 * including no-snoop TLPs on PCIe or other platform
435 * specific mechanisms.
436 * @enable_nesting: Enable nesting
437 * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
438 * @free: Release the domain after use.
439 */
440struct iommu_domain_ops {
441 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
442 int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
443 ioasid_t pasid);
444
445 int (*map)(struct iommu_domain *domain, unsigned long iova,
446 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
447 int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
448 phys_addr_t paddr, size_t pgsize, size_t pgcount,
449 int prot, gfp_t gfp, size_t *mapped);
450 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
451 size_t size, struct iommu_iotlb_gather *iotlb_gather);
452 size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
453 size_t pgsize, size_t pgcount,
454 struct iommu_iotlb_gather *iotlb_gather);
455
456 void (*flush_iotlb_all)(struct iommu_domain *domain);
457 void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
458 size_t size);
459 void (*iotlb_sync)(struct iommu_domain *domain,
460 struct iommu_iotlb_gather *iotlb_gather);
461
462 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
463 dma_addr_t iova);
464
465 bool (*enforce_cache_coherency)(struct iommu_domain *domain);
466 int (*enable_nesting)(struct iommu_domain *domain);
467 int (*set_pgtable_quirks)(struct iommu_domain *domain,
468 unsigned long quirks);
469
470 void (*free)(struct iommu_domain *domain);
471};
472
473/**
474 * struct iommu_device - IOMMU core representation of one IOMMU hardware
475 * instance
476 * @list: Used by the iommu-core to keep a list of registered iommus
477 * @ops: iommu-ops for talking to this iommu
478 * @dev: struct device for sysfs handling
479 * @max_pasids: number of supported PASIDs
480 */
481struct iommu_device {
482 struct list_head list;
483 const struct iommu_ops *ops;
484 struct fwnode_handle *fwnode;
485 struct device *dev;
486 u32 max_pasids;
487};
488
489/**
490 * struct iommu_fault_event - Generic fault event
491 *
492 * Can represent recoverable faults such as a page requests or
493 * unrecoverable faults such as DMA or IRQ remapping faults.
494 *
495 * @fault: fault descriptor
496 * @list: pending fault event list, used for tracking responses
497 */
498struct iommu_fault_event {
499 struct iommu_fault fault;
500 struct list_head list;
501};
502
503/**
504 * struct iommu_fault_param - per-device IOMMU fault data
505 * @handler: Callback function to handle IOMMU faults at device level
506 * @data: handler private data
507 * @faults: holds the pending faults which needs response
508 * @lock: protect pending faults list
509 */
510struct iommu_fault_param {
511 iommu_dev_fault_handler_t handler;
512 void *data;
513 struct list_head faults;
514 struct mutex lock;
515};
516
517/**
518 * struct dev_iommu - Collection of per-device IOMMU data
519 *
520 * @fault_param: IOMMU detected device fault reporting data
521 * @iopf_param: I/O Page Fault queue and data
522 * @fwspec: IOMMU fwspec data
523 * @iommu_dev: IOMMU device this device is linked to
524 * @priv: IOMMU Driver private data
525 * @max_pasids: number of PASIDs this device can consume
526 * @attach_deferred: the dma domain attachment is deferred
527 * @pci_32bit_workaround: Limit DMA allocations to 32-bit IOVAs
528 * @require_direct: device requires IOMMU_RESV_DIRECT regions
529 *
530 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
531 * struct iommu_group *iommu_group;
532 */
533struct dev_iommu {
534 struct mutex lock;
535 struct iommu_fault_param *fault_param;
536 struct iopf_device_param *iopf_param;
537 struct iommu_fwspec *fwspec;
538 struct iommu_device *iommu_dev;
539 void *priv;
540 u32 max_pasids;
541 u32 attach_deferred:1;
542 u32 pci_32bit_workaround:1;
543 u32 require_direct:1;
544};
545
546int iommu_device_register(struct iommu_device *iommu,
547 const struct iommu_ops *ops,
548 struct device *hwdev);
549void iommu_device_unregister(struct iommu_device *iommu);
550int iommu_device_sysfs_add(struct iommu_device *iommu,
551 struct device *parent,
552 const struct attribute_group **groups,
553 const char *fmt, ...) __printf(4, 5);
554void iommu_device_sysfs_remove(struct iommu_device *iommu);
555int iommu_device_link(struct iommu_device *iommu, struct device *link);
556void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
557int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
558
559static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
560{
561 return (struct iommu_device *)dev_get_drvdata(dev);
562}
563
564static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
565{
566 *gather = (struct iommu_iotlb_gather) {
567 .start = ULONG_MAX,
568 .freelist = LIST_HEAD_INIT(gather->freelist),
569 };
570}
571
572extern int bus_iommu_probe(const struct bus_type *bus);
573extern bool iommu_present(const struct bus_type *bus);
574extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
575extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
576extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
577extern void iommu_domain_free(struct iommu_domain *domain);
578extern int iommu_attach_device(struct iommu_domain *domain,
579 struct device *dev);
580extern void iommu_detach_device(struct iommu_domain *domain,
581 struct device *dev);
582extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
583 struct device *dev, ioasid_t pasid);
584extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
585extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
586extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
587 phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
588extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
589 size_t size);
590extern size_t iommu_unmap_fast(struct iommu_domain *domain,
591 unsigned long iova, size_t size,
592 struct iommu_iotlb_gather *iotlb_gather);
593extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
594 struct scatterlist *sg, unsigned int nents,
595 int prot, gfp_t gfp);
596extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
597extern void iommu_set_fault_handler(struct iommu_domain *domain,
598 iommu_fault_handler_t handler, void *token);
599
600extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
601extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
602extern void iommu_set_default_passthrough(bool cmd_line);
603extern void iommu_set_default_translated(bool cmd_line);
604extern bool iommu_default_passthrough(void);
605extern struct iommu_resv_region *
606iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
607 enum iommu_resv_type type, gfp_t gfp);
608extern int iommu_get_group_resv_regions(struct iommu_group *group,
609 struct list_head *head);
610
611extern int iommu_attach_group(struct iommu_domain *domain,
612 struct iommu_group *group);
613extern void iommu_detach_group(struct iommu_domain *domain,
614 struct iommu_group *group);
615extern struct iommu_group *iommu_group_alloc(void);
616extern void *iommu_group_get_iommudata(struct iommu_group *group);
617extern void iommu_group_set_iommudata(struct iommu_group *group,
618 void *iommu_data,
619 void (*release)(void *iommu_data));
620extern int iommu_group_set_name(struct iommu_group *group, const char *name);
621extern int iommu_group_add_device(struct iommu_group *group,
622 struct device *dev);
623extern void iommu_group_remove_device(struct device *dev);
624extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
625 int (*fn)(struct device *, void *));
626extern struct iommu_group *iommu_group_get(struct device *dev);
627extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
628extern void iommu_group_put(struct iommu_group *group);
629extern int iommu_register_device_fault_handler(struct device *dev,
630 iommu_dev_fault_handler_t handler,
631 void *data);
632
633extern int iommu_unregister_device_fault_handler(struct device *dev);
634
635extern int iommu_report_device_fault(struct device *dev,
636 struct iommu_fault_event *evt);
637extern int iommu_page_response(struct device *dev,
638 struct iommu_page_response *msg);
639
640extern int iommu_group_id(struct iommu_group *group);
641extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
642
643int iommu_enable_nesting(struct iommu_domain *domain);
644int iommu_set_pgtable_quirks(struct iommu_domain *domain,
645 unsigned long quirks);
646
647void iommu_set_dma_strict(void);
648
649extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
650 unsigned long iova, int flags);
651
652static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
653{
654 if (domain->ops->flush_iotlb_all)
655 domain->ops->flush_iotlb_all(domain);
656}
657
658static inline void iommu_iotlb_sync(struct iommu_domain *domain,
659 struct iommu_iotlb_gather *iotlb_gather)
660{
661 if (domain->ops->iotlb_sync)
662 domain->ops->iotlb_sync(domain, iotlb_gather);
663
664 iommu_iotlb_gather_init(gather: iotlb_gather);
665}
666
667/**
668 * iommu_iotlb_gather_is_disjoint - Checks whether a new range is disjoint
669 *
670 * @gather: TLB gather data
671 * @iova: start of page to invalidate
672 * @size: size of page to invalidate
673 *
674 * Helper for IOMMU drivers to check whether a new range and the gathered range
675 * are disjoint. For many IOMMUs, flushing the IOMMU in this case is better
676 * than merging the two, which might lead to unnecessary invalidations.
677 */
678static inline
679bool iommu_iotlb_gather_is_disjoint(struct iommu_iotlb_gather *gather,
680 unsigned long iova, size_t size)
681{
682 unsigned long start = iova, end = start + size - 1;
683
684 return gather->end != 0 &&
685 (end + 1 < gather->start || start > gather->end + 1);
686}
687
688
689/**
690 * iommu_iotlb_gather_add_range - Gather for address-based TLB invalidation
691 * @gather: TLB gather data
692 * @iova: start of page to invalidate
693 * @size: size of page to invalidate
694 *
695 * Helper for IOMMU drivers to build arbitrarily-sized invalidation commands
696 * where only the address range matters, and simply minimising intermediate
697 * syncs is preferred.
698 */
699static inline void iommu_iotlb_gather_add_range(struct iommu_iotlb_gather *gather,
700 unsigned long iova, size_t size)
701{
702 unsigned long end = iova + size - 1;
703
704 if (gather->start > iova)
705 gather->start = iova;
706 if (gather->end < end)
707 gather->end = end;
708}
709
710/**
711 * iommu_iotlb_gather_add_page - Gather for page-based TLB invalidation
712 * @domain: IOMMU domain to be invalidated
713 * @gather: TLB gather data
714 * @iova: start of page to invalidate
715 * @size: size of page to invalidate
716 *
717 * Helper for IOMMU drivers to build invalidation commands based on individual
718 * pages, or with page size/table level hints which cannot be gathered if they
719 * differ.
720 */
721static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
722 struct iommu_iotlb_gather *gather,
723 unsigned long iova, size_t size)
724{
725 /*
726 * If the new page is disjoint from the current range or is mapped at
727 * a different granularity, then sync the TLB so that the gather
728 * structure can be rewritten.
729 */
730 if ((gather->pgsize && gather->pgsize != size) ||
731 iommu_iotlb_gather_is_disjoint(gather, iova, size))
732 iommu_iotlb_sync(domain, iotlb_gather: gather);
733
734 gather->pgsize = size;
735 iommu_iotlb_gather_add_range(gather, iova, size);
736}
737
738static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
739{
740 return gather && gather->queued;
741}
742
743static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
744 struct iova_bitmap *bitmap,
745 struct iommu_iotlb_gather *gather)
746{
747 if (gather)
748 iommu_iotlb_gather_init(gather);
749
750 dirty->bitmap = bitmap;
751 dirty->gather = gather;
752}
753
754static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
755 unsigned long iova,
756 unsigned long length)
757{
758 if (dirty->bitmap)
759 iova_bitmap_set(bitmap: dirty->bitmap, iova, length);
760
761 if (dirty->gather)
762 iommu_iotlb_gather_add_range(gather: dirty->gather, iova, size: length);
763}
764
765/* PCI device grouping function */
766extern struct iommu_group *pci_device_group(struct device *dev);
767/* Generic device grouping function */
768extern struct iommu_group *generic_device_group(struct device *dev);
769/* FSL-MC device grouping function */
770struct iommu_group *fsl_mc_device_group(struct device *dev);
771
772/**
773 * struct iommu_fwspec - per-device IOMMU instance data
774 * @ops: ops for this device's IOMMU
775 * @iommu_fwnode: firmware handle for this device's IOMMU
776 * @flags: IOMMU_FWSPEC_* flags
777 * @num_ids: number of associated device IDs
778 * @ids: IDs which this device may present to the IOMMU
779 *
780 * Note that the IDs (and any other information, really) stored in this structure should be
781 * considered private to the IOMMU device driver and are not to be used directly by IOMMU
782 * consumers.
783 */
784struct iommu_fwspec {
785 const struct iommu_ops *ops;
786 struct fwnode_handle *iommu_fwnode;
787 u32 flags;
788 unsigned int num_ids;
789 u32 ids[];
790};
791
792/* ATS is supported */
793#define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
794
795/**
796 * struct iommu_sva - handle to a device-mm bond
797 */
798struct iommu_sva {
799 struct device *dev;
800 struct iommu_domain *domain;
801};
802
803int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
804 const struct iommu_ops *ops);
805void iommu_fwspec_free(struct device *dev);
806int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
807const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
808
809static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
810{
811 if (dev->iommu)
812 return dev->iommu->fwspec;
813 else
814 return NULL;
815}
816
817static inline void dev_iommu_fwspec_set(struct device *dev,
818 struct iommu_fwspec *fwspec)
819{
820 dev->iommu->fwspec = fwspec;
821}
822
823static inline void *dev_iommu_priv_get(struct device *dev)
824{
825 if (dev->iommu)
826 return dev->iommu->priv;
827 else
828 return NULL;
829}
830
831static inline void dev_iommu_priv_set(struct device *dev, void *priv)
832{
833 dev->iommu->priv = priv;
834}
835
836int iommu_probe_device(struct device *dev);
837
838int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
839int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
840
841int iommu_device_use_default_domain(struct device *dev);
842void iommu_device_unuse_default_domain(struct device *dev);
843
844int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
845void iommu_group_release_dma_owner(struct iommu_group *group);
846bool iommu_group_dma_owner_claimed(struct iommu_group *group);
847
848int iommu_device_claim_dma_owner(struct device *dev, void *owner);
849void iommu_device_release_dma_owner(struct device *dev);
850
851struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
852 struct mm_struct *mm);
853int iommu_attach_device_pasid(struct iommu_domain *domain,
854 struct device *dev, ioasid_t pasid);
855void iommu_detach_device_pasid(struct iommu_domain *domain,
856 struct device *dev, ioasid_t pasid);
857struct iommu_domain *
858iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
859 unsigned int type);
860ioasid_t iommu_alloc_global_pasid(struct device *dev);
861void iommu_free_global_pasid(ioasid_t pasid);
862#else /* CONFIG_IOMMU_API */
863
864struct iommu_ops {};
865struct iommu_group {};
866struct iommu_fwspec {};
867struct iommu_device {};
868struct iommu_fault_param {};
869struct iommu_iotlb_gather {};
870struct iommu_dirty_bitmap {};
871struct iommu_dirty_ops {};
872
873static inline bool iommu_present(const struct bus_type *bus)
874{
875 return false;
876}
877
878static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
879{
880 return false;
881}
882
883static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
884{
885 return NULL;
886}
887
888static inline void iommu_domain_free(struct iommu_domain *domain)
889{
890}
891
892static inline int iommu_attach_device(struct iommu_domain *domain,
893 struct device *dev)
894{
895 return -ENODEV;
896}
897
898static inline void iommu_detach_device(struct iommu_domain *domain,
899 struct device *dev)
900{
901}
902
903static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
904{
905 return NULL;
906}
907
908static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
909 phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
910{
911 return -ENODEV;
912}
913
914static inline size_t iommu_unmap(struct iommu_domain *domain,
915 unsigned long iova, size_t size)
916{
917 return 0;
918}
919
920static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
921 unsigned long iova, int gfp_order,
922 struct iommu_iotlb_gather *iotlb_gather)
923{
924 return 0;
925}
926
927static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
928 unsigned long iova, struct scatterlist *sg,
929 unsigned int nents, int prot, gfp_t gfp)
930{
931 return -ENODEV;
932}
933
934static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
935{
936}
937
938static inline void iommu_iotlb_sync(struct iommu_domain *domain,
939 struct iommu_iotlb_gather *iotlb_gather)
940{
941}
942
943static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
944{
945 return 0;
946}
947
948static inline void iommu_set_fault_handler(struct iommu_domain *domain,
949 iommu_fault_handler_t handler, void *token)
950{
951}
952
953static inline void iommu_get_resv_regions(struct device *dev,
954 struct list_head *list)
955{
956}
957
958static inline void iommu_put_resv_regions(struct device *dev,
959 struct list_head *list)
960{
961}
962
963static inline int iommu_get_group_resv_regions(struct iommu_group *group,
964 struct list_head *head)
965{
966 return -ENODEV;
967}
968
969static inline void iommu_set_default_passthrough(bool cmd_line)
970{
971}
972
973static inline void iommu_set_default_translated(bool cmd_line)
974{
975}
976
977static inline bool iommu_default_passthrough(void)
978{
979 return true;
980}
981
982static inline int iommu_attach_group(struct iommu_domain *domain,
983 struct iommu_group *group)
984{
985 return -ENODEV;
986}
987
988static inline void iommu_detach_group(struct iommu_domain *domain,
989 struct iommu_group *group)
990{
991}
992
993static inline struct iommu_group *iommu_group_alloc(void)
994{
995 return ERR_PTR(-ENODEV);
996}
997
998static inline void *iommu_group_get_iommudata(struct iommu_group *group)
999{
1000 return NULL;
1001}
1002
1003static inline void iommu_group_set_iommudata(struct iommu_group *group,
1004 void *iommu_data,
1005 void (*release)(void *iommu_data))
1006{
1007}
1008
1009static inline int iommu_group_set_name(struct iommu_group *group,
1010 const char *name)
1011{
1012 return -ENODEV;
1013}
1014
1015static inline int iommu_group_add_device(struct iommu_group *group,
1016 struct device *dev)
1017{
1018 return -ENODEV;
1019}
1020
1021static inline void iommu_group_remove_device(struct device *dev)
1022{
1023}
1024
1025static inline int iommu_group_for_each_dev(struct iommu_group *group,
1026 void *data,
1027 int (*fn)(struct device *, void *))
1028{
1029 return -ENODEV;
1030}
1031
1032static inline struct iommu_group *iommu_group_get(struct device *dev)
1033{
1034 return NULL;
1035}
1036
1037static inline void iommu_group_put(struct iommu_group *group)
1038{
1039}
1040
1041static inline
1042int iommu_register_device_fault_handler(struct device *dev,
1043 iommu_dev_fault_handler_t handler,
1044 void *data)
1045{
1046 return -ENODEV;
1047}
1048
1049static inline int iommu_unregister_device_fault_handler(struct device *dev)
1050{
1051 return 0;
1052}
1053
1054static inline
1055int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
1056{
1057 return -ENODEV;
1058}
1059
1060static inline int iommu_page_response(struct device *dev,
1061 struct iommu_page_response *msg)
1062{
1063 return -ENODEV;
1064}
1065
1066static inline int iommu_group_id(struct iommu_group *group)
1067{
1068 return -ENODEV;
1069}
1070
1071static inline int iommu_set_pgtable_quirks(struct iommu_domain *domain,
1072 unsigned long quirks)
1073{
1074 return 0;
1075}
1076
1077static inline int iommu_device_register(struct iommu_device *iommu,
1078 const struct iommu_ops *ops,
1079 struct device *hwdev)
1080{
1081 return -ENODEV;
1082}
1083
1084static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
1085{
1086 return NULL;
1087}
1088
1089static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
1090{
1091}
1092
1093static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
1094 struct iommu_iotlb_gather *gather,
1095 unsigned long iova, size_t size)
1096{
1097}
1098
1099static inline bool iommu_iotlb_gather_queued(struct iommu_iotlb_gather *gather)
1100{
1101 return false;
1102}
1103
1104static inline void iommu_dirty_bitmap_init(struct iommu_dirty_bitmap *dirty,
1105 struct iova_bitmap *bitmap,
1106 struct iommu_iotlb_gather *gather)
1107{
1108}
1109
1110static inline void iommu_dirty_bitmap_record(struct iommu_dirty_bitmap *dirty,
1111 unsigned long iova,
1112 unsigned long length)
1113{
1114}
1115
1116static inline void iommu_device_unregister(struct iommu_device *iommu)
1117{
1118}
1119
1120static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
1121 struct device *parent,
1122 const struct attribute_group **groups,
1123 const char *fmt, ...)
1124{
1125 return -ENODEV;
1126}
1127
1128static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
1129{
1130}
1131
1132static inline int iommu_device_link(struct device *dev, struct device *link)
1133{
1134 return -EINVAL;
1135}
1136
1137static inline void iommu_device_unlink(struct device *dev, struct device *link)
1138{
1139}
1140
1141static inline int iommu_fwspec_init(struct device *dev,
1142 struct fwnode_handle *iommu_fwnode,
1143 const struct iommu_ops *ops)
1144{
1145 return -ENODEV;
1146}
1147
1148static inline void iommu_fwspec_free(struct device *dev)
1149{
1150}
1151
1152static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
1153 int num_ids)
1154{
1155 return -ENODEV;
1156}
1157
1158static inline
1159const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
1160{
1161 return NULL;
1162}
1163
1164static inline int
1165iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
1166{
1167 return -ENODEV;
1168}
1169
1170static inline int
1171iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1172{
1173 return -ENODEV;
1174}
1175
1176static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1177{
1178 return NULL;
1179}
1180
1181static inline int iommu_device_use_default_domain(struct device *dev)
1182{
1183 return 0;
1184}
1185
1186static inline void iommu_device_unuse_default_domain(struct device *dev)
1187{
1188}
1189
1190static inline int
1191iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
1192{
1193 return -ENODEV;
1194}
1195
1196static inline void iommu_group_release_dma_owner(struct iommu_group *group)
1197{
1198}
1199
1200static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
1201{
1202 return false;
1203}
1204
1205static inline void iommu_device_release_dma_owner(struct device *dev)
1206{
1207}
1208
1209static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
1210{
1211 return -ENODEV;
1212}
1213
1214static inline struct iommu_domain *
1215iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
1216{
1217 return NULL;
1218}
1219
1220static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
1221 struct device *dev, ioasid_t pasid)
1222{
1223 return -ENODEV;
1224}
1225
1226static inline void iommu_detach_device_pasid(struct iommu_domain *domain,
1227 struct device *dev, ioasid_t pasid)
1228{
1229}
1230
1231static inline struct iommu_domain *
1232iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
1233 unsigned int type)
1234{
1235 return NULL;
1236}
1237
1238static inline ioasid_t iommu_alloc_global_pasid(struct device *dev)
1239{
1240 return IOMMU_PASID_INVALID;
1241}
1242
1243static inline void iommu_free_global_pasid(ioasid_t pasid) {}
1244#endif /* CONFIG_IOMMU_API */
1245
1246/**
1247 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1248 * @domain: The IOMMU domain to perform the mapping
1249 * @iova: The start address to map the buffer
1250 * @sgt: The sg_table object describing the buffer
1251 * @prot: IOMMU protection bits
1252 *
1253 * Creates a mapping at @iova for the buffer described by a scatterlist
1254 * stored in the given sg_table object in the provided IOMMU domain.
1255 */
1256static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
1257 unsigned long iova, struct sg_table *sgt, int prot)
1258{
1259 return iommu_map_sg(domain, iova, sg: sgt->sgl, nents: sgt->orig_nents, prot,
1260 GFP_KERNEL);
1261}
1262
1263#ifdef CONFIG_IOMMU_DEBUGFS
1264extern struct dentry *iommu_debugfs_dir;
1265void iommu_debugfs_setup(void);
1266#else
1267static inline void iommu_debugfs_setup(void) {}
1268#endif
1269
1270#ifdef CONFIG_IOMMU_DMA
1271#include <linux/msi.h>
1272
1273/* Setup call for arch DMA mapping code */
1274void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
1275
1276int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
1277
1278int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
1279void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg);
1280
1281#else /* CONFIG_IOMMU_DMA */
1282
1283struct msi_desc;
1284struct msi_msg;
1285
1286static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
1287{
1288}
1289
1290static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
1291{
1292 return -ENODEV;
1293}
1294
1295static inline int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
1296{
1297 return 0;
1298}
1299
1300static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
1301{
1302}
1303
1304#endif /* CONFIG_IOMMU_DMA */
1305
1306/*
1307 * Newer generations of Tegra SoCs require devices' stream IDs to be directly programmed into
1308 * some registers. These are always paired with a Tegra SMMU or ARM SMMU, for which the contents
1309 * of the struct iommu_fwspec are known. Use this helper to formalize access to these internals.
1310 */
1311#define TEGRA_STREAM_ID_BYPASS 0x7f
1312
1313static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream_id)
1314{
1315#ifdef CONFIG_IOMMU_API
1316 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
1317
1318 if (fwspec && fwspec->num_ids == 1) {
1319 *stream_id = fwspec->ids[0] & 0xffff;
1320 return true;
1321 }
1322#endif
1323
1324 return false;
1325}
1326
1327#ifdef CONFIG_IOMMU_SVA
1328static inline void mm_pasid_init(struct mm_struct *mm)
1329{
1330 mm->pasid = IOMMU_PASID_INVALID;
1331}
1332static inline bool mm_valid_pasid(struct mm_struct *mm)
1333{
1334 return mm->pasid != IOMMU_PASID_INVALID;
1335}
1336void mm_pasid_drop(struct mm_struct *mm);
1337struct iommu_sva *iommu_sva_bind_device(struct device *dev,
1338 struct mm_struct *mm);
1339void iommu_sva_unbind_device(struct iommu_sva *handle);
1340u32 iommu_sva_get_pasid(struct iommu_sva *handle);
1341#else
1342static inline struct iommu_sva *
1343iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
1344{
1345 return NULL;
1346}
1347
1348static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1349{
1350}
1351
1352static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1353{
1354 return IOMMU_PASID_INVALID;
1355}
1356static inline void mm_pasid_init(struct mm_struct *mm) {}
1357static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
1358static inline void mm_pasid_drop(struct mm_struct *mm) {}
1359#endif /* CONFIG_IOMMU_SVA */
1360
1361#endif /* __LINUX_IOMMU_H */
1362

source code of linux/include/linux/iommu.h