include/linux/iommu.h

   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
  17 #define IOMMU_READ      (1 << 0)
  18 #define IOMMU_WRITE     (1 << 1)
  19 #define IOMMU_CACHE     (1 << 2) /* DMA cache coherency */
  20 #define IOMMU_NOEXEC    (1 << 3)
  21 #define IOMMU_MMIO      (1 << 4) /* e.g. things like MSI doorbells */
  22 /*
  23  * Where the bus hardware includes a privilege level as part of its access type
  24  * markings, and certain devices are capable of issuing transactions marked as
  25  * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
  26  * given permission flags only apply to accesses at the higher privilege level,
  27  * and that unprivileged transactions should have as little access as possible.
  28  * This would usually imply the same permissions as kernel mappings on the CPU,
  29  * if the IOMMU page table format is equivalent.
  30  */
  31 #define IOMMU_PRIV      (1 << 5)
  32
  33 struct iommu_ops;
  34 struct iommu_group;
  35 struct bus_type;
  36 struct device;
  37 struct iommu_domain;
  38 struct notifier_block;
  39 struct iommu_sva;
  40
  41 /* iommu fault flags */
  42 #define IOMMU_FAULT_READ        0x0
  43 #define IOMMU_FAULT_WRITE       0x1
  44
  45 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  46                         struct device *, unsigned long, int, void *);
  47 typedef int (*iommu_mm_exit_handler_t)(struct device *dev, struct iommu_sva *,
  48                                        void *);
  49
  50 struct iommu_domain_geometry {
  51         dma_addr_t aperture_start; /* First address that can be mapped    */
  52         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  53         bool force_aperture;       /* DMA only allowed in mappable range? */
  54 };
  55
  56 /* Domain feature flags */
  57 #define __IOMMU_DOMAIN_PAGING   (1U << 0)  /* Support for iommu_map/unmap */
  58 #define __IOMMU_DOMAIN_DMA_API  (1U << 1)  /* Domain for use in DMA-API
  59                                               implementation              */
  60 #define __IOMMU_DOMAIN_PT       (1U << 2)  /* Domain is identity mapped   */
  61
  62 /*
  63  * This are the possible domain-types
  64  *
  65  *      IOMMU_DOMAIN_BLOCKED    - All DMA is blocked, can be used to isolate
  66  *                                devices
  67  *      IOMMU_DOMAIN_IDENTITY   - DMA addresses are system physical addresses
  68  *      IOMMU_DOMAIN_UNMANAGED  - DMA mappings managed by IOMMU-API user, used
  69  *                                for VMs
  70  *      IOMMU_DOMAIN_DMA        - Internally used for DMA-API implementations.
  71  *                                This flag allows IOMMU drivers to implement
  72  *                                certain optimizations for these domains
  73  */
  74 #define IOMMU_DOMAIN_BLOCKED    (0U)
  75 #define IOMMU_DOMAIN_IDENTITY   (__IOMMU_DOMAIN_PT)
  76 #define IOMMU_DOMAIN_UNMANAGED  (__IOMMU_DOMAIN_PAGING)
  77 #define IOMMU_DOMAIN_DMA        (__IOMMU_DOMAIN_PAGING |        \
  78                                  __IOMMU_DOMAIN_DMA_API)
  79
  80 struct iommu_domain {
  81         unsigned type;
  82         const struct iommu_ops *ops;
  83         unsigned long pgsize_bitmap;    /* Bitmap of page sizes in use */
  84         iommu_fault_handler_t handler;
  85         void *handler_token;
  86         struct iommu_domain_geometry geometry;
  87         void *iova_cookie;
  88 };
  89
  90 enum iommu_cap {
  91         IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
  92                                            transactions */
  93         IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
  94         IOMMU_CAP_NOEXEC,               /* IOMMU_NOEXEC flag */
  95 };
  96
  97 /*
  98  * Following constraints are specifc to FSL_PAMUV1:
  99  *  -aperture must be power of 2, and naturally aligned
 100  *  -number of windows must be power of 2, and address space size
 101  *   of each window is determined by aperture size / # of windows
 102  *  -the actual size of the mapped region of a window must be power
 103  *   of 2 starting with 4KB and physical address must be naturally
 104  *   aligned.
 105  * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
 106  * The caller can invoke iommu_domain_get_attr to check if the underlying
 107  * iommu implementation supports these constraints.
 108  */
 109
 110 enum iommu_attr {
 111         DOMAIN_ATTR_GEOMETRY,
 112         DOMAIN_ATTR_PAGING,
 113         DOMAIN_ATTR_WINDOWS,
 114         DOMAIN_ATTR_FSL_PAMU_STASH,
 115         DOMAIN_ATTR_FSL_PAMU_ENABLE,
 116         DOMAIN_ATTR_FSL_PAMUV1,
 117         DOMAIN_ATTR_NESTING,    /* two stages of translation */
 118         DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
 119         DOMAIN_ATTR_MAX,
 120 };
 121
 122 /* These are the possible reserved region types */
 123 enum iommu_resv_type {
 124         /* Memory regions which must be mapped 1:1 at all times */
 125         IOMMU_RESV_DIRECT,
 126         /* Arbitrary "never map this or give it to a device" address ranges */
 127         IOMMU_RESV_RESERVED,
 128         /* Hardware MSI region (untranslated) */
 129         IOMMU_RESV_MSI,
 130         /* Software-managed MSI translation window */
 131         IOMMU_RESV_SW_MSI,
 132 };
 133
 134 /**
 135  * struct iommu_resv_region - descriptor for a reserved memory region
 136  * @list: Linked list pointers
 137  * @start: System physical start address of the region
 138  * @length: Length of the region in bytes
 139  * @prot: IOMMU Protection flags (READ/WRITE/...)
 140  * @type: Type of the reserved region
 141  */
 142 struct iommu_resv_region {
 143         struct list_head        list;
 144         phys_addr_t             start;
 145         size_t                  length;
 146         int                     prot;
 147         enum iommu_resv_type    type;
 148 };
 149
 150 /* Per device IOMMU features */
 151 enum iommu_dev_features {
 152         IOMMU_DEV_FEAT_AUX,     /* Aux-domain feature */
 153         IOMMU_DEV_FEAT_SVA,     /* Shared Virtual Addresses */
 154 };
 155
 156 #define IOMMU_PASID_INVALID     (-1U)
 157
 158 /**
 159  * struct iommu_sva_ops - device driver callbacks for an SVA context
 160  *
 161  * @mm_exit: called when the mm is about to be torn down by exit_mmap. After
 162  *           @mm_exit returns, the device must not issue any more transaction
 163  *           with the PASID given as argument.
 164  *
 165  *           The @mm_exit handler is allowed to sleep. Be careful about the
 166  *           locks taken in @mm_exit, because they might lead to deadlocks if
 167  *           they are also held when dropping references to the mm. Consider the
 168  *           following call chain:
 169  *           mutex_lock(A); mmput(mm) -> exit_mm() -> @mm_exit() -> mutex_lock(A)
 170  *           Using mmput_async() prevents this scenario.
 171  *
 172  */
 173 struct iommu_sva_ops {
 174         iommu_mm_exit_handler_t mm_exit;
 175 };
 176
 177 #ifdef CONFIG_IOMMU_API
 178
 179 /**
 180  * struct iommu_ops - iommu ops and capabilities
 181  * @capable: check capability
 182  * @domain_alloc: allocate iommu domain
 183  * @domain_free: free iommu domain
 184  * @attach_dev: attach device to an iommu domain
 185  * @detach_dev: detach device from an iommu domain
 186  * @map: map a physically contiguous memory region to an iommu domain
 187  * @unmap: unmap a physically contiguous memory region from an iommu domain
 188  * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
 189  * @iotlb_range_add: Add a given iova range to the flush queue for this domain
 190  * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
 191  * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
 192  *            queue
 193  * @iova_to_phys: translate iova to physical address
 194  * @add_device: add device to iommu grouping
 195  * @remove_device: remove device from iommu grouping
 196  * @device_group: find iommu group for a particular device
 197  * @domain_get_attr: Query domain attributes
 198  * @domain_set_attr: Change domain attributes
 199  * @get_resv_regions: Request list of reserved regions for a device
 200  * @put_resv_regions: Free list of reserved regions for a device
 201  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 202  * @domain_window_enable: Configure and enable a particular window for a domain
 203  * @domain_window_disable: Disable a particular window for a domain
 204  * @of_xlate: add OF master IDs to iommu grouping
 205  * @is_attach_deferred: Check if domain attach should be deferred from iommu
 206  *                      driver init to device driver init (default no)
 207  * @dev_has/enable/disable_feat: per device entries to check/enable/disable
 208  *                               iommu specific features.
 209  * @dev_feat_enabled: check enabled feature
 210  * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
 211  * @aux_get_pasid: get the pasid given an aux-domain
 212  * @sva_bind: Bind process address space to device
 213  * @sva_unbind: Unbind process address space from device
 214  * @sva_get_pasid: Get PASID associated to a SVA handle
 215  * @pgsize_bitmap: bitmap of all possible supported page sizes
 216  */
 217 struct iommu_ops {
 218         bool (*capable)(enum iommu_cap);
 219
 220         /* Domain allocation and freeing by the iommu driver */
 221         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 222         void (*domain_free)(struct iommu_domain *);
 223
 224         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 225         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 226         int (*map)(struct iommu_domain *domain, unsigned long iova,
 227                    phys_addr_t paddr, size_t size, int prot);
 228         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 229                      size_t size);
 230         void (*flush_iotlb_all)(struct iommu_domain *domain);
 231         void (*iotlb_range_add)(struct iommu_domain *domain,
 232                                 unsigned long iova, size_t size);
 233         void (*iotlb_sync_map)(struct iommu_domain *domain);
 234         void (*iotlb_sync)(struct iommu_domain *domain);
 235         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 236         int (*add_device)(struct device *dev);
 237         void (*remove_device)(struct device *dev);
 238         struct iommu_group *(*device_group)(struct device *dev);
 239         int (*domain_get_attr)(struct iommu_domain *domain,
 240                                enum iommu_attr attr, void *data);
 241         int (*domain_set_attr)(struct iommu_domain *domain,
 242                                enum iommu_attr attr, void *data);
 243
 244         /* Request/Free a list of reserved regions for a device */
 245         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 246         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 247         void (*apply_resv_region)(struct device *dev,
 248                                   struct iommu_domain *domain,
 249                                   struct iommu_resv_region *region);
 250
 251         /* Window handling functions */
 252         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 253                                     phys_addr_t paddr, u64 size, int prot);
 254         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 255
 256         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 257         bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 258
 259         /* Per device IOMMU features */
 260         bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
 261         bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
 262         int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
 263         int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
 264
 265         /* Aux-domain specific attach/detach entries */
 266         int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
 267         void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
 268         int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);
 269
 270         struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
 271                                       void *drvdata);
 272         void (*sva_unbind)(struct iommu_sva *handle);
 273         int (*sva_get_pasid)(struct iommu_sva *handle);
 274
 275         unsigned long pgsize_bitmap;
 276 };
 277
 278 /**
 279  * struct iommu_device - IOMMU core representation of one IOMMU hardware
 280  *                       instance
 281  * @list: Used by the iommu-core to keep a list of registered iommus
 282  * @ops: iommu-ops for talking to this iommu
 283  * @dev: struct device for sysfs handling
 284  */
 285 struct iommu_device {
 286         struct list_head list;
 287         const struct iommu_ops *ops;
 288         struct fwnode_handle *fwnode;
 289         struct device *dev;
 290 };
 291
 292 int  iommu_device_register(struct iommu_device *iommu);
 293 void iommu_device_unregister(struct iommu_device *iommu);
 294 int  iommu_device_sysfs_add(struct iommu_device *iommu,
 295                             struct device *parent,
 296                             const struct attribute_group **groups,
 297                             const char *fmt, ...) __printf(4, 5);
 298 void iommu_device_sysfs_remove(struct iommu_device *iommu);
 299 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
 300 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
 301
 302 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 303                                         const struct iommu_ops *ops)
 304 {
 305         iommu->ops = ops;
 306 }
 307
 308 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 309                                            struct fwnode_handle *fwnode)
 310 {
 311         iommu->fwnode = fwnode;
 312 }
 313
 314 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 315 {
 316         return (struct iommu_device *)dev_get_drvdata(dev);
 317 }
 318
 319 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 320 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 321 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 322 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 323 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 324 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 325
 326 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 327 extern bool iommu_present(struct bus_type *bus);
 328 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 329 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 330 extern struct iommu_group *iommu_group_get_by_id(int id);
 331 extern void iommu_domain_free(struct iommu_domain *domain);
 332 extern int iommu_attach_device(struct iommu_domain *domain,
 333                                struct device *dev);
 334 extern void iommu_detach_device(struct iommu_domain *domain,
 335                                 struct device *dev);
 336 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 337 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
 338 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 339                      phys_addr_t paddr, size_t size, int prot);
 340 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 341                           size_t size);
 342 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
 343                                unsigned long iova, size_t size);
 344 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 345                            struct scatterlist *sg,unsigned int nents, int prot);
 346 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 347 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 348                         iommu_fault_handler_t handler, void *token);
 349
 350 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 351 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 352 extern int iommu_request_dm_for_dev(struct device *dev);
 353 extern struct iommu_resv_region *
 354 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 355                         enum iommu_resv_type type);
 356 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 357                                         struct list_head *head);
 358
 359 extern int iommu_attach_group(struct iommu_domain *domain,
 360                               struct iommu_group *group);
 361 extern void iommu_detach_group(struct iommu_domain *domain,
 362                                struct iommu_group *group);
 363 extern struct iommu_group *iommu_group_alloc(void);
 364 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 365 extern void iommu_group_set_iommudata(struct iommu_group *group,
 366                                       void *iommu_data,
 367                                       void (*release)(void *iommu_data));
 368 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 369 extern int iommu_group_add_device(struct iommu_group *group,
 370                                   struct device *dev);
 371 extern void iommu_group_remove_device(struct device *dev);
 372 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 373                                     int (*fn)(struct device *, void *));
 374 extern struct iommu_group *iommu_group_get(struct device *dev);
 375 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 376 extern void iommu_group_put(struct iommu_group *group);
 377 extern int iommu_group_register_notifier(struct iommu_group *group,
 378                                          struct notifier_block *nb);
 379 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 380                                            struct notifier_block *nb);
 381 extern int iommu_group_id(struct iommu_group *group);
 382 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 383 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 384
 385 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 386                                  void *data);
 387 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 388                                  void *data);
 389
 390 /* Window handling function prototypes */
 391 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 392                                       phys_addr_t offset, u64 size,
 393                                       int prot);
 394 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 395
 396 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 397                               unsigned long iova, int flags);
 398
 399 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 400 {
 401         if (domain->ops->flush_iotlb_all)
 402                 domain->ops->flush_iotlb_all(domain);
 403 }
 404
 405 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 406                                        unsigned long iova, size_t size)
 407 {
 408         if (domain->ops->iotlb_range_add)
 409                 domain->ops->iotlb_range_add(domain, iova, size);
 410 }
 411
 412 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 413 {
 414         if (domain->ops->iotlb_sync)
 415                 domain->ops->iotlb_sync(domain);
 416 }
 417
 418 /* PCI device grouping function */
 419 extern struct iommu_group *pci_device_group(struct device *dev);
 420 /* Generic device grouping function */
 421 extern struct iommu_group *generic_device_group(struct device *dev);
 422 /* FSL-MC device grouping function */
 423 struct iommu_group *fsl_mc_device_group(struct device *dev);
 424
 425 /**
 426  * struct iommu_fwspec - per-device IOMMU instance data
 427  * @ops: ops for this device's IOMMU
 428  * @iommu_fwnode: firmware handle for this device's IOMMU
 429  * @iommu_priv: IOMMU driver private data for this device
 430  * @num_ids: number of associated device IDs
 431  * @ids: IDs which this device may present to the IOMMU
 432  */
 433 struct iommu_fwspec {
 434         const struct iommu_ops  *ops;
 435         struct fwnode_handle    *iommu_fwnode;
 436         void                    *iommu_priv;
 437         u32                     flags;
 438         unsigned int            num_ids;
 439         u32                     ids[1];
 440 };
 441
 442 /* ATS is supported */
 443 #define IOMMU_FWSPEC_PCI_RC_ATS                 (1 << 0)
 444
 445 /**
 446  * struct iommu_sva - handle to a device-mm bond
 447  */
 448 struct iommu_sva {
 449         struct device                   *dev;
 450         const struct iommu_sva_ops      *ops;
 451 };
 452
 453 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 454                       const struct iommu_ops *ops);
 455 void iommu_fwspec_free(struct device *dev);
 456 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 457 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 458
 459 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
 460 {
 461         return dev->iommu_fwspec;
 462 }
 463
 464 static inline void dev_iommu_fwspec_set(struct device *dev,
 465                                         struct iommu_fwspec *fwspec)
 466 {
 467         dev->iommu_fwspec = fwspec;
 468 }
 469
 470 int iommu_probe_device(struct device *dev);
 471 void iommu_release_device(struct device *dev);
 472
 473 bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
 474 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
 475 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
 476 bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
 477 int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
 478 void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
 479 int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);
 480
 481 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
 482                                         struct mm_struct *mm,
 483                                         void *drvdata);
 484 void iommu_sva_unbind_device(struct iommu_sva *handle);
 485 int iommu_sva_set_ops(struct iommu_sva *handle,
 486                       const struct iommu_sva_ops *ops);
 487 int iommu_sva_get_pasid(struct iommu_sva *handle);
 488
 489 #else /* CONFIG_IOMMU_API */
 490
 491 struct iommu_ops {};
 492 struct iommu_group {};
 493 struct iommu_fwspec {};
 494 struct iommu_device {};
 495
 496 static inline bool iommu_present(struct bus_type *bus)
 497 {
 498         return false;
 499 }
 500
 501 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 502 {
 503         return false;
 504 }
 505
 506 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 507 {
 508         return NULL;
 509 }
 510
 511 static inline struct iommu_group *iommu_group_get_by_id(int id)
 512 {
 513         return NULL;
 514 }
 515
 516 static inline void iommu_domain_free(struct iommu_domain *domain)
 517 {
 518 }
 519
 520 static inline int iommu_attach_device(struct iommu_domain *domain,
 521                                       struct device *dev)
 522 {
 523         return -ENODEV;
 524 }
 525
 526 static inline void iommu_detach_device(struct iommu_domain *domain,
 527                                        struct device *dev)
 528 {
 529 }
 530
 531 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 532 {
 533         return NULL;
 534 }
 535
 536 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 537                             phys_addr_t paddr, size_t size, int prot)
 538 {
 539         return -ENODEV;
 540 }
 541
 542 static inline size_t iommu_unmap(struct iommu_domain *domain,
 543                                  unsigned long iova, size_t size)
 544 {
 545         return 0;
 546 }
 547
 548 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
 549                                       unsigned long iova, int gfp_order)
 550 {
 551         return 0;
 552 }
 553
 554 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 555                                   unsigned long iova, struct scatterlist *sg,
 556                                   unsigned int nents, int prot)
 557 {
 558         return 0;
 559 }
 560
 561 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 562 {
 563 }
 564
 565 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 566                                        unsigned long iova, size_t size)
 567 {
 568 }
 569
 570 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 571 {
 572 }
 573
 574 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 575                                              u32 wnd_nr, phys_addr_t paddr,
 576                                              u64 size, int prot)
 577 {
 578         return -ENODEV;
 579 }
 580
 581 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 582                                                u32 wnd_nr)
 583 {
 584 }
 585
 586 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 587 {
 588         return 0;
 589 }
 590
 591 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 592                                 iommu_fault_handler_t handler, void *token)
 593 {
 594 }
 595
 596 static inline void iommu_get_resv_regions(struct device *dev,
 597                                         struct list_head *list)
 598 {
 599 }
 600
 601 static inline void iommu_put_resv_regions(struct device *dev,
 602                                         struct list_head *list)
 603 {
 604 }
 605
 606 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 607                                                struct list_head *head)
 608 {
 609         return -ENODEV;
 610 }
 611
 612 static inline int iommu_request_dm_for_dev(struct device *dev)
 613 {
 614         return -ENODEV;
 615 }
 616
 617 static inline int iommu_attach_group(struct iommu_domain *domain,
 618                                      struct iommu_group *group)
 619 {
 620         return -ENODEV;
 621 }
 622
 623 static inline void iommu_detach_group(struct iommu_domain *domain,
 624                                       struct iommu_group *group)
 625 {
 626 }
 627
 628 static inline struct iommu_group *iommu_group_alloc(void)
 629 {
 630         return ERR_PTR(-ENODEV);
 631 }
 632
 633 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 634 {
 635         return NULL;
 636 }
 637
 638 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 639                                              void *iommu_data,
 640                                              void (*release)(void *iommu_data))
 641 {
 642 }
 643
 644 static inline int iommu_group_set_name(struct iommu_group *group,
 645                                        const char *name)
 646 {
 647         return -ENODEV;
 648 }
 649
 650 static inline int iommu_group_add_device(struct iommu_group *group,
 651                                          struct device *dev)
 652 {
 653         return -ENODEV;
 654 }
 655
 656 static inline void iommu_group_remove_device(struct device *dev)
 657 {
 658 }
 659
 660 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 661                                            void *data,
 662                                            int (*fn)(struct device *, void *))
 663 {
 664         return -ENODEV;
 665 }
 666
 667 static inline struct iommu_group *iommu_group_get(struct device *dev)
 668 {
 669         return NULL;
 670 }
 671
 672 static inline void iommu_group_put(struct iommu_group *group)
 673 {
 674 }
 675
 676 static inline int iommu_group_register_notifier(struct iommu_group *group,
 677                                                 struct notifier_block *nb)
 678 {
 679         return -ENODEV;
 680 }
 681
 682 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 683                                                   struct notifier_block *nb)
 684 {
 685         return 0;
 686 }
 687
 688 static inline int iommu_group_id(struct iommu_group *group)
 689 {
 690         return -ENODEV;
 691 }
 692
 693 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 694                                         enum iommu_attr attr, void *data)
 695 {
 696         return -EINVAL;
 697 }
 698
 699 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 700                                         enum iommu_attr attr, void *data)
 701 {
 702         return -EINVAL;
 703 }
 704
 705 static inline int  iommu_device_register(struct iommu_device *iommu)
 706 {
 707         return -ENODEV;
 708 }
 709
 710 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 711                                         const struct iommu_ops *ops)
 712 {
 713 }
 714
 715 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 716                                            struct fwnode_handle *fwnode)
 717 {
 718 }
 719
 720 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 721 {
 722         return NULL;
 723 }
 724
 725 static inline void iommu_device_unregister(struct iommu_device *iommu)
 726 {
 727 }
 728
 729 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
 730                                           struct device *parent,
 731                                           const struct attribute_group **groups,
 732                                           const char *fmt, ...)
 733 {
 734         return -ENODEV;
 735 }
 736
 737 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
 738 {
 739 }
 740
 741 static inline int iommu_device_link(struct device *dev, struct device *link)
 742 {
 743         return -EINVAL;
 744 }
 745
 746 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 747 {
 748 }
 749
 750 static inline int iommu_fwspec_init(struct device *dev,
 751                                     struct fwnode_handle *iommu_fwnode,
 752                                     const struct iommu_ops *ops)
 753 {
 754         return -ENODEV;
 755 }
 756
 757 static inline void iommu_fwspec_free(struct device *dev)
 758 {
 759 }
 760
 761 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 762                                        int num_ids)
 763 {
 764         return -ENODEV;
 765 }
 766
 767 static inline
 768 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 769 {
 770         return NULL;
 771 }
 772
 773 static inline bool
 774 iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
 775 {
 776         return false;
 777 }
 778
 779 static inline bool
 780 iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
 781 {
 782         return false;
 783 }
 784
 785 static inline int
 786 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
 787 {
 788         return -ENODEV;
 789 }
 790
 791 static inline int
 792 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
 793 {
 794         return -ENODEV;
 795 }
 796
 797 static inline int
 798 iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
 799 {
 800         return -ENODEV;
 801 }
 802
 803 static inline void
 804 iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
 805 {
 806 }
 807
 808 static inline int
 809 iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
 810 {
 811         return -ENODEV;
 812 }
 813
 814 static inline struct iommu_sva *
 815 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
 816 {
 817         return NULL;
 818 }
 819
 820 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
 821 {
 822 }
 823
 824 static inline int iommu_sva_set_ops(struct iommu_sva *handle,
 825                                     const struct iommu_sva_ops *ops)
 826 {
 827         return -EINVAL;
 828 }
 829
 830 static inline int iommu_sva_get_pasid(struct iommu_sva *handle)
 831 {
 832         return IOMMU_PASID_INVALID;
 833 }
 834
 835 #endif /* CONFIG_IOMMU_API */
 836
 837 #ifdef CONFIG_IOMMU_DEBUGFS
 838 extern  struct dentry *iommu_debugfs_dir;
 839 void iommu_debugfs_setup(void);
 840 #else
 841 static inline void iommu_debugfs_setup(void) {}
 842 #endif
 843
 844 #endif /* __LINUX_IOMMU_H */