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TOMOYO Linux Cross Reference
Linux/include/linux/iommu.h

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  1 /*
  2  * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
  3  * Author: Joerg Roedel <joerg.roedel@amd.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 as published
  7  * by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the Free Software
 16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 17  */
 18 
 19 #ifndef __LINUX_IOMMU_H
 20 #define __LINUX_IOMMU_H
 21 
 22 #include <linux/scatterlist.h>
 23 #include <linux/device.h>
 24 #include <linux/types.h>
 25 #include <linux/errno.h>
 26 #include <linux/err.h>
 27 #include <linux/of.h>
 28 
 29 #define IOMMU_READ      (1 << 0)
 30 #define IOMMU_WRITE     (1 << 1)
 31 #define IOMMU_CACHE     (1 << 2) /* DMA cache coherency */
 32 #define IOMMU_NOEXEC    (1 << 3)
 33 #define IOMMU_MMIO      (1 << 4) /* e.g. things like MSI doorbells */
 34 /*
 35  * Where the bus hardware includes a privilege level as part of its access type
 36  * markings, and certain devices are capable of issuing transactions marked as
 37  * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
 38  * given permission flags only apply to accesses at the higher privilege level,
 39  * and that unprivileged transactions should have as little access as possible.
 40  * This would usually imply the same permissions as kernel mappings on the CPU,
 41  * if the IOMMU page table format is equivalent.
 42  */
 43 #define IOMMU_PRIV      (1 << 5)
 44 
 45 struct iommu_ops;
 46 struct iommu_group;
 47 struct bus_type;
 48 struct device;
 49 struct iommu_domain;
 50 struct notifier_block;
 51 struct iommu_sva;
 52 
 53 /* iommu fault flags */
 54 #define IOMMU_FAULT_READ        0x0
 55 #define IOMMU_FAULT_WRITE       0x1
 56 
 57 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
 58                         struct device *, unsigned long, int, void *);
 59 typedef int (*iommu_mm_exit_handler_t)(struct device *dev, struct iommu_sva *,
 60                                        void *);
 61 
 62 struct iommu_domain_geometry {
 63         dma_addr_t aperture_start; /* First address that can be mapped    */
 64         dma_addr_t aperture_end;   /* Last address that can be mapped     */
 65         bool force_aperture;       /* DMA only allowed in mappable range? */
 66 };
 67 
 68 /* Domain feature flags */
 69 #define __IOMMU_DOMAIN_PAGING   (1U << 0)  /* Support for iommu_map/unmap */
 70 #define __IOMMU_DOMAIN_DMA_API  (1U << 1)  /* Domain for use in DMA-API
 71                                               implementation              */
 72 #define __IOMMU_DOMAIN_PT       (1U << 2)  /* Domain is identity mapped   */
 73 
 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  */
 86 #define IOMMU_DOMAIN_BLOCKED    (0U)
 87 #define IOMMU_DOMAIN_IDENTITY   (__IOMMU_DOMAIN_PT)
 88 #define IOMMU_DOMAIN_UNMANAGED  (__IOMMU_DOMAIN_PAGING)
 89 #define IOMMU_DOMAIN_DMA        (__IOMMU_DOMAIN_PAGING |        \
 90                                  __IOMMU_DOMAIN_DMA_API)
 91 
 92 struct iommu_domain {
 93         unsigned type;
 94         const struct iommu_ops *ops;
 95         unsigned long pgsize_bitmap;    /* Bitmap of page sizes in use */
 96         iommu_fault_handler_t handler;
 97         void *handler_token;
 98         struct iommu_domain_geometry geometry;
 99         void *iova_cookie;
100 };
101 
102 enum iommu_cap {
103         IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
104                                            transactions */
105         IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
106         IOMMU_CAP_NOEXEC,               /* IOMMU_NOEXEC flag */
107 };
108 
109 /*
110  * Following constraints are specifc to FSL_PAMUV1:
111  *  -aperture must be power of 2, and naturally aligned
112  *  -number of windows must be power of 2, and address space size
113  *   of each window is determined by aperture size / # of windows
114  *  -the actual size of the mapped region of a window must be power
115  *   of 2 starting with 4KB and physical address must be naturally
116  *   aligned.
117  * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
118  * The caller can invoke iommu_domain_get_attr to check if the underlying
119  * iommu implementation supports these constraints.
120  */
121 
122 enum iommu_attr {
123         DOMAIN_ATTR_GEOMETRY,
124         DOMAIN_ATTR_PAGING,
125         DOMAIN_ATTR_WINDOWS,
126         DOMAIN_ATTR_FSL_PAMU_STASH,
127         DOMAIN_ATTR_FSL_PAMU_ENABLE,
128         DOMAIN_ATTR_FSL_PAMUV1,
129         DOMAIN_ATTR_NESTING,    /* two stages of translation */
130         DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
131         DOMAIN_ATTR_MAX,
132 };
133 
134 /* These are the possible reserved region types */
135 enum iommu_resv_type {
136         /* Memory regions which must be mapped 1:1 at all times */
137         IOMMU_RESV_DIRECT,
138         /* Arbitrary "never map this or give it to a device" address ranges */
139         IOMMU_RESV_RESERVED,
140         /* Hardware MSI region (untranslated) */
141         IOMMU_RESV_MSI,
142         /* Software-managed MSI translation window */
143         IOMMU_RESV_SW_MSI,
144 };
145 
146 /**
147  * struct iommu_resv_region - descriptor for a reserved memory region
148  * @list: Linked list pointers
149  * @start: System physical start address of the region
150  * @length: Length of the region in bytes
151  * @prot: IOMMU Protection flags (READ/WRITE/...)
152  * @type: Type of the reserved region
153  */
154 struct iommu_resv_region {
155         struct list_head        list;
156         phys_addr_t             start;
157         size_t                  length;
158         int                     prot;
159         enum iommu_resv_type    type;
160 };
161 
162 /* Per device IOMMU features */
163 enum iommu_dev_features {
164         IOMMU_DEV_FEAT_AUX,     /* Aux-domain feature */
165         IOMMU_DEV_FEAT_SVA,     /* Shared Virtual Addresses */
166 };
167 
168 #define IOMMU_PASID_INVALID     (-1U)
169 
170 /**
171  * struct iommu_sva_ops - device driver callbacks for an SVA context
172  *
173  * @mm_exit: called when the mm is about to be torn down by exit_mmap. After
174  *           @mm_exit returns, the device must not issue any more transaction
175  *           with the PASID given as argument.
176  *
177  *           The @mm_exit handler is allowed to sleep. Be careful about the
178  *           locks taken in @mm_exit, because they might lead to deadlocks if
179  *           they are also held when dropping references to the mm. Consider the
180  *           following call chain:
181  *           mutex_lock(A); mmput(mm) -> exit_mm() -> @mm_exit() -> mutex_lock(A)
182  *           Using mmput_async() prevents this scenario.
183  *
184  */
185 struct iommu_sva_ops {
186         iommu_mm_exit_handler_t mm_exit;
187 };
188 
189 #ifdef CONFIG_IOMMU_API
190 
191 /**
192  * struct iommu_ops - iommu ops and capabilities
193  * @capable: check capability
194  * @domain_alloc: allocate iommu domain
195  * @domain_free: free iommu domain
196  * @attach_dev: attach device to an iommu domain
197  * @detach_dev: detach device from an iommu domain
198  * @map: map a physically contiguous memory region to an iommu domain
199  * @unmap: unmap a physically contiguous memory region from an iommu domain
200  * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
201  * @iotlb_range_add: Add a given iova range to the flush queue for this domain
202  * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
203  * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
204  *            queue
205  * @iova_to_phys: translate iova to physical address
206  * @add_device: add device to iommu grouping
207  * @remove_device: remove device from iommu grouping
208  * @device_group: find iommu group for a particular device
209  * @domain_get_attr: Query domain attributes
210  * @domain_set_attr: Change domain attributes
211  * @get_resv_regions: Request list of reserved regions for a device
212  * @put_resv_regions: Free list of reserved regions for a device
213  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
214  * @domain_window_enable: Configure and enable a particular window for a domain
215  * @domain_window_disable: Disable a particular window for a domain
216  * @of_xlate: add OF master IDs to iommu grouping
217  * @is_attach_deferred: Check if domain attach should be deferred from iommu
218  *                      driver init to device driver init (default no)
219  * @dev_has/enable/disable_feat: per device entries to check/enable/disable
220  *                               iommu specific features.
221  * @dev_feat_enabled: check enabled feature
222  * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
223  * @aux_get_pasid: get the pasid given an aux-domain
224  * @sva_bind: Bind process address space to device
225  * @sva_unbind: Unbind process address space from device
226  * @sva_get_pasid: Get PASID associated to a SVA handle
227  * @pgsize_bitmap: bitmap of all possible supported page sizes
228  */
229 struct iommu_ops {
230         bool (*capable)(enum iommu_cap);
231 
232         /* Domain allocation and freeing by the iommu driver */
233         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
234         void (*domain_free)(struct iommu_domain *);
235 
236         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
237         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
238         int (*map)(struct iommu_domain *domain, unsigned long iova,
239                    phys_addr_t paddr, size_t size, int prot);
240         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
241                      size_t size);
242         void (*flush_iotlb_all)(struct iommu_domain *domain);
243         void (*iotlb_range_add)(struct iommu_domain *domain,
244                                 unsigned long iova, size_t size);
245         void (*iotlb_sync_map)(struct iommu_domain *domain);
246         void (*iotlb_sync)(struct iommu_domain *domain);
247         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
248         int (*add_device)(struct device *dev);
249         void (*remove_device)(struct device *dev);
250         struct iommu_group *(*device_group)(struct device *dev);
251         int (*domain_get_attr)(struct iommu_domain *domain,
252                                enum iommu_attr attr, void *data);
253         int (*domain_set_attr)(struct iommu_domain *domain,
254                                enum iommu_attr attr, void *data);
255 
256         /* Request/Free a list of reserved regions for a device */
257         void (*get_resv_regions)(struct device *dev, struct list_head *list);
258         void (*put_resv_regions)(struct device *dev, struct list_head *list);
259         void (*apply_resv_region)(struct device *dev,
260                                   struct iommu_domain *domain,
261                                   struct iommu_resv_region *region);
262 
263         /* Window handling functions */
264         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
265                                     phys_addr_t paddr, u64 size, int prot);
266         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
267 
268         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
269         bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
270 
271         /* Per device IOMMU features */
272         bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
273         bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
274         int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
275         int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
276 
277         /* Aux-domain specific attach/detach entries */
278         int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
279         void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
280         int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);
281 
282         struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
283                                       void *drvdata);
284         void (*sva_unbind)(struct iommu_sva *handle);
285         int (*sva_get_pasid)(struct iommu_sva *handle);
286 
287         unsigned long pgsize_bitmap;
288 };
289 
290 /**
291  * struct iommu_device - IOMMU core representation of one IOMMU hardware
292  *                       instance
293  * @list: Used by the iommu-core to keep a list of registered iommus
294  * @ops: iommu-ops for talking to this iommu
295  * @dev: struct device for sysfs handling
296  */
297 struct iommu_device {
298         struct list_head list;
299         const struct iommu_ops *ops;
300         struct fwnode_handle *fwnode;
301         struct device *dev;
302 };
303 
304 int  iommu_device_register(struct iommu_device *iommu);
305 void iommu_device_unregister(struct iommu_device *iommu);
306 int  iommu_device_sysfs_add(struct iommu_device *iommu,
307                             struct device *parent,
308                             const struct attribute_group **groups,
309                             const char *fmt, ...) __printf(4, 5);
310 void iommu_device_sysfs_remove(struct iommu_device *iommu);
311 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
312 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
313 
314 static inline void iommu_device_set_ops(struct iommu_device *iommu,
315                                         const struct iommu_ops *ops)
316 {
317         iommu->ops = ops;
318 }
319 
320 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
321                                            struct fwnode_handle *fwnode)
322 {
323         iommu->fwnode = fwnode;
324 }
325 
326 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
327 {
328         return (struct iommu_device *)dev_get_drvdata(dev);
329 }
330 
331 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
332 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
333 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
334 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
335 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
336 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
337 
338 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
339 extern bool iommu_present(struct bus_type *bus);
340 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
341 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
342 extern struct iommu_group *iommu_group_get_by_id(int id);
343 extern void iommu_domain_free(struct iommu_domain *domain);
344 extern int iommu_attach_device(struct iommu_domain *domain,
345                                struct device *dev);
346 extern void iommu_detach_device(struct iommu_domain *domain,
347                                 struct device *dev);
348 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
349 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
350 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
351                      phys_addr_t paddr, size_t size, int prot);
352 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
353                           size_t size);
354 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
355                                unsigned long iova, size_t size);
356 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
357                            struct scatterlist *sg,unsigned int nents, int prot);
358 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
359 extern void iommu_set_fault_handler(struct iommu_domain *domain,
360                         iommu_fault_handler_t handler, void *token);
361 
362 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
363 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
364 extern int iommu_request_dm_for_dev(struct device *dev);
365 extern struct iommu_resv_region *
366 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
367                         enum iommu_resv_type type);
368 extern int iommu_get_group_resv_regions(struct iommu_group *group,
369                                         struct list_head *head);
370 
371 extern int iommu_attach_group(struct iommu_domain *domain,
372                               struct iommu_group *group);
373 extern void iommu_detach_group(struct iommu_domain *domain,
374                                struct iommu_group *group);
375 extern struct iommu_group *iommu_group_alloc(void);
376 extern void *iommu_group_get_iommudata(struct iommu_group *group);
377 extern void iommu_group_set_iommudata(struct iommu_group *group,
378                                       void *iommu_data,
379                                       void (*release)(void *iommu_data));
380 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
381 extern int iommu_group_add_device(struct iommu_group *group,
382                                   struct device *dev);
383 extern void iommu_group_remove_device(struct device *dev);
384 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
385                                     int (*fn)(struct device *, void *));
386 extern struct iommu_group *iommu_group_get(struct device *dev);
387 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
388 extern void iommu_group_put(struct iommu_group *group);
389 extern int iommu_group_register_notifier(struct iommu_group *group,
390                                          struct notifier_block *nb);
391 extern int iommu_group_unregister_notifier(struct iommu_group *group,
392                                            struct notifier_block *nb);
393 extern int iommu_group_id(struct iommu_group *group);
394 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
395 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
396 
397 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
398                                  void *data);
399 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
400                                  void *data);
401 
402 /* Window handling function prototypes */
403 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
404                                       phys_addr_t offset, u64 size,
405                                       int prot);
406 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
407 
408 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
409                               unsigned long iova, int flags);
410 
411 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
412 {
413         if (domain->ops->flush_iotlb_all)
414                 domain->ops->flush_iotlb_all(domain);
415 }
416 
417 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
418                                        unsigned long iova, size_t size)
419 {
420         if (domain->ops->iotlb_range_add)
421                 domain->ops->iotlb_range_add(domain, iova, size);
422 }
423 
424 static inline void iommu_tlb_sync(struct iommu_domain *domain)
425 {
426         if (domain->ops->iotlb_sync)
427                 domain->ops->iotlb_sync(domain);
428 }
429 
430 /* PCI device grouping function */
431 extern struct iommu_group *pci_device_group(struct device *dev);
432 /* Generic device grouping function */
433 extern struct iommu_group *generic_device_group(struct device *dev);
434 /* FSL-MC device grouping function */
435 struct iommu_group *fsl_mc_device_group(struct device *dev);
436 
437 /**
438  * struct iommu_fwspec - per-device IOMMU instance data
439  * @ops: ops for this device's IOMMU
440  * @iommu_fwnode: firmware handle for this device's IOMMU
441  * @iommu_priv: IOMMU driver private data for this device
442  * @num_ids: number of associated device IDs
443  * @ids: IDs which this device may present to the IOMMU
444  */
445 struct iommu_fwspec {
446         const struct iommu_ops  *ops;
447         struct fwnode_handle    *iommu_fwnode;
448         void                    *iommu_priv;
449         u32                     flags;
450         unsigned int            num_ids;
451         u32                     ids[1];
452 };
453 
454 /* ATS is supported */
455 #define IOMMU_FWSPEC_PCI_RC_ATS                 (1 << 0)
456 
457 /**
458  * struct iommu_sva - handle to a device-mm bond
459  */
460 struct iommu_sva {
461         struct device                   *dev;
462         const struct iommu_sva_ops      *ops;
463 };
464 
465 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
466                       const struct iommu_ops *ops);
467 void iommu_fwspec_free(struct device *dev);
468 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
469 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
470 
471 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
472 {
473         return dev->iommu_fwspec;
474 }
475 
476 static inline void dev_iommu_fwspec_set(struct device *dev,
477                                         struct iommu_fwspec *fwspec)
478 {
479         dev->iommu_fwspec = fwspec;
480 }
481 
482 int iommu_probe_device(struct device *dev);
483 void iommu_release_device(struct device *dev);
484 
485 bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
486 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
487 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
488 bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
489 int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
490 void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
491 int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);
492 
493 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
494                                         struct mm_struct *mm,
495                                         void *drvdata);
496 void iommu_sva_unbind_device(struct iommu_sva *handle);
497 int iommu_sva_set_ops(struct iommu_sva *handle,
498                       const struct iommu_sva_ops *ops);
499 int iommu_sva_get_pasid(struct iommu_sva *handle);
500 
501 #else /* CONFIG_IOMMU_API */
502 
503 struct iommu_ops {};
504 struct iommu_group {};
505 struct iommu_fwspec {};
506 struct iommu_device {};
507 
508 static inline bool iommu_present(struct bus_type *bus)
509 {
510         return false;
511 }
512 
513 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
514 {
515         return false;
516 }
517 
518 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
519 {
520         return NULL;
521 }
522 
523 static inline struct iommu_group *iommu_group_get_by_id(int id)
524 {
525         return NULL;
526 }
527 
528 static inline void iommu_domain_free(struct iommu_domain *domain)
529 {
530 }
531 
532 static inline int iommu_attach_device(struct iommu_domain *domain,
533                                       struct device *dev)
534 {
535         return -ENODEV;
536 }
537 
538 static inline void iommu_detach_device(struct iommu_domain *domain,
539                                        struct device *dev)
540 {
541 }
542 
543 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
544 {
545         return NULL;
546 }
547 
548 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
549                             phys_addr_t paddr, size_t size, int prot)
550 {
551         return -ENODEV;
552 }
553 
554 static inline size_t iommu_unmap(struct iommu_domain *domain,
555                                  unsigned long iova, size_t size)
556 {
557         return 0;
558 }
559 
560 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
561                                       unsigned long iova, int gfp_order)
562 {
563         return 0;
564 }
565 
566 static inline size_t iommu_map_sg(struct iommu_domain *domain,
567                                   unsigned long iova, struct scatterlist *sg,
568                                   unsigned int nents, int prot)
569 {
570         return 0;
571 }
572 
573 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
574 {
575 }
576 
577 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
578                                        unsigned long iova, size_t size)
579 {
580 }
581 
582 static inline void iommu_tlb_sync(struct iommu_domain *domain)
583 {
584 }
585 
586 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
587                                              u32 wnd_nr, phys_addr_t paddr,
588                                              u64 size, int prot)
589 {
590         return -ENODEV;
591 }
592 
593 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
594                                                u32 wnd_nr)
595 {
596 }
597 
598 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
599 {
600         return 0;
601 }
602 
603 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
604                                 iommu_fault_handler_t handler, void *token)
605 {
606 }
607 
608 static inline void iommu_get_resv_regions(struct device *dev,
609                                         struct list_head *list)
610 {
611 }
612 
613 static inline void iommu_put_resv_regions(struct device *dev,
614                                         struct list_head *list)
615 {
616 }
617 
618 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
619                                                struct list_head *head)
620 {
621         return -ENODEV;
622 }
623 
624 static inline int iommu_request_dm_for_dev(struct device *dev)
625 {
626         return -ENODEV;
627 }
628 
629 static inline int iommu_attach_group(struct iommu_domain *domain,
630                                      struct iommu_group *group)
631 {
632         return -ENODEV;
633 }
634 
635 static inline void iommu_detach_group(struct iommu_domain *domain,
636                                       struct iommu_group *group)
637 {
638 }
639 
640 static inline struct iommu_group *iommu_group_alloc(void)
641 {
642         return ERR_PTR(-ENODEV);
643 }
644 
645 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
646 {
647         return NULL;
648 }
649 
650 static inline void iommu_group_set_iommudata(struct iommu_group *group,
651                                              void *iommu_data,
652                                              void (*release)(void *iommu_data))
653 {
654 }
655 
656 static inline int iommu_group_set_name(struct iommu_group *group,
657                                        const char *name)
658 {
659         return -ENODEV;
660 }
661 
662 static inline int iommu_group_add_device(struct iommu_group *group,
663                                          struct device *dev)
664 {
665         return -ENODEV;
666 }
667 
668 static inline void iommu_group_remove_device(struct device *dev)
669 {
670 }
671 
672 static inline int iommu_group_for_each_dev(struct iommu_group *group,
673                                            void *data,
674                                            int (*fn)(struct device *, void *))
675 {
676         return -ENODEV;
677 }
678 
679 static inline struct iommu_group *iommu_group_get(struct device *dev)
680 {
681         return NULL;
682 }
683 
684 static inline void iommu_group_put(struct iommu_group *group)
685 {
686 }
687 
688 static inline int iommu_group_register_notifier(struct iommu_group *group,
689                                                 struct notifier_block *nb)
690 {
691         return -ENODEV;
692 }
693 
694 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
695                                                   struct notifier_block *nb)
696 {
697         return 0;
698 }
699 
700 static inline int iommu_group_id(struct iommu_group *group)
701 {
702         return -ENODEV;
703 }
704 
705 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
706                                         enum iommu_attr attr, void *data)
707 {
708         return -EINVAL;
709 }
710 
711 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
712                                         enum iommu_attr attr, void *data)
713 {
714         return -EINVAL;
715 }
716 
717 static inline int  iommu_device_register(struct iommu_device *iommu)
718 {
719         return -ENODEV;
720 }
721 
722 static inline void iommu_device_set_ops(struct iommu_device *iommu,
723                                         const struct iommu_ops *ops)
724 {
725 }
726 
727 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
728                                            struct fwnode_handle *fwnode)
729 {
730 }
731 
732 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
733 {
734         return NULL;
735 }
736 
737 static inline void iommu_device_unregister(struct iommu_device *iommu)
738 {
739 }
740 
741 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
742                                           struct device *parent,
743                                           const struct attribute_group **groups,
744                                           const char *fmt, ...)
745 {
746         return -ENODEV;
747 }
748 
749 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
750 {
751 }
752 
753 static inline int iommu_device_link(struct device *dev, struct device *link)
754 {
755         return -EINVAL;
756 }
757 
758 static inline void iommu_device_unlink(struct device *dev, struct device *link)
759 {
760 }
761 
762 static inline int iommu_fwspec_init(struct device *dev,
763                                     struct fwnode_handle *iommu_fwnode,
764                                     const struct iommu_ops *ops)
765 {
766         return -ENODEV;
767 }
768 
769 static inline void iommu_fwspec_free(struct device *dev)
770 {
771 }
772 
773 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
774                                        int num_ids)
775 {
776         return -ENODEV;
777 }
778 
779 static inline
780 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
781 {
782         return NULL;
783 }
784 
785 static inline bool
786 iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
787 {
788         return false;
789 }
790 
791 static inline bool
792 iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
793 {
794         return false;
795 }
796 
797 static inline int
798 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
799 {
800         return -ENODEV;
801 }
802 
803 static inline int
804 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
805 {
806         return -ENODEV;
807 }
808 
809 static inline int
810 iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
811 {
812         return -ENODEV;
813 }
814 
815 static inline void
816 iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
817 {
818 }
819 
820 static inline int
821 iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
822 {
823         return -ENODEV;
824 }
825 
826 static inline struct iommu_sva *
827 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
828 {
829         return NULL;
830 }
831 
832 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
833 {
834 }
835 
836 static inline int iommu_sva_set_ops(struct iommu_sva *handle,
837                                     const struct iommu_sva_ops *ops)
838 {
839         return -EINVAL;
840 }
841 
842 static inline int iommu_sva_get_pasid(struct iommu_sva *handle)
843 {
844         return IOMMU_PASID_INVALID;
845 }
846 
847 #endif /* CONFIG_IOMMU_API */
848 
849 #ifdef CONFIG_IOMMU_DEBUGFS
850 extern  struct dentry *iommu_debugfs_dir;
851 void iommu_debugfs_setup(void);
852 #else
853 static inline void iommu_debugfs_setup(void) {}
854 #endif
855 
856 #endif /* __LINUX_IOMMU_H */
857 

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