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