include/linux/iommu.h

   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/errno.h>
  23 #include <linux/err.h>
  24 #include <linux/of.h>
  25 #include <linux/types.h>
  26 #include <linux/scatterlist.h>
  27 #include <trace/events/iommu.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  * This is to make the IOMMU API setup privileged
  36  * mapppings accessible by the master only at higher
  37  * privileged execution level and inaccessible at
  38  * less privileged levels.
  39  */
  40 #define IOMMU_PRIV      (1 << 5)
  41
  42 struct iommu_ops;
  43 struct iommu_group;
  44 struct bus_type;
  45 struct device;
  46 struct iommu_domain;
  47 struct notifier_block;
  48
  49 /* iommu fault flags */
  50 #define IOMMU_FAULT_READ        0x0
  51 #define IOMMU_FAULT_WRITE       0x1
  52
  53 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  54                         struct device *, unsigned long, int, void *);
  55
  56 struct iommu_domain_geometry {
  57         dma_addr_t aperture_start; /* First address that can be mapped    */
  58         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  59         bool force_aperture;       /* DMA only allowed in mappable range? */
  60 };
  61
  62 /* Domain feature flags */
  63 #define __IOMMU_DOMAIN_PAGING   (1U << 0)  /* Support for iommu_map/unmap */
  64 #define __IOMMU_DOMAIN_DMA_API  (1U << 1)  /* Domain for use in DMA-API
  65                                               implementation              */
  66 #define __IOMMU_DOMAIN_PT       (1U << 2)  /* Domain is identity mapped   */
  67
  68 /*
  69  * This are the possible domain-types
  70  *
  71  *      IOMMU_DOMAIN_BLOCKED    - All DMA is blocked, can be used to isolate
  72  *                                devices
  73  *      IOMMU_DOMAIN_IDENTITY   - DMA addresses are system physical addresses
  74  *      IOMMU_DOMAIN_UNMANAGED  - DMA mappings managed by IOMMU-API user, used
  75  *                                for VMs
  76  *      IOMMU_DOMAIN_DMA        - Internally used for DMA-API implementations.
  77  *                                This flag allows IOMMU drivers to implement
  78  *                                certain optimizations for these domains
  79  */
  80 #define IOMMU_DOMAIN_BLOCKED    (0U)
  81 #define IOMMU_DOMAIN_IDENTITY   (__IOMMU_DOMAIN_PT)
  82 #define IOMMU_DOMAIN_UNMANAGED  (__IOMMU_DOMAIN_PAGING)
  83 #define IOMMU_DOMAIN_DMA        (__IOMMU_DOMAIN_PAGING |        \
  84                                  __IOMMU_DOMAIN_DMA_API)
  85
  86 struct iommu_domain {
  87         unsigned type;
  88         const struct iommu_ops *ops;
  89         unsigned long pgsize_bitmap;    /* Bitmap of page sizes in use */
  90         iommu_fault_handler_t handler;
  91         void *handler_token;
  92         struct iommu_domain_geometry geometry;
  93         void *iova_cookie;
  94 };
  95
  96 enum iommu_cap {
  97         IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
  98                                            transactions */
  99         IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
 100         IOMMU_CAP_NOEXEC,               /* IOMMU_NOEXEC flag */
 101 };
 102
 103 /*
 104  * Following constraints are specifc to FSL_PAMUV1:
 105  *  -aperture must be power of 2, and naturally aligned
 106  *  -number of windows must be power of 2, and address space size
 107  *   of each window is determined by aperture size / # of windows
 108  *  -the actual size of the mapped region of a window must be power
 109  *   of 2 starting with 4KB and physical address must be naturally
 110  *   aligned.
 111  * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
 112  * The caller can invoke iommu_domain_get_attr to check if the underlying
 113  * iommu implementation supports these constraints.
 114  */
 115
 116 enum iommu_attr {
 117         DOMAIN_ATTR_GEOMETRY,
 118         DOMAIN_ATTR_PAGING,
 119         DOMAIN_ATTR_WINDOWS,
 120         DOMAIN_ATTR_FSL_PAMU_STASH,
 121         DOMAIN_ATTR_FSL_PAMU_ENABLE,
 122         DOMAIN_ATTR_FSL_PAMUV1,
 123         DOMAIN_ATTR_NESTING,    /* two stages of translation */
 124         DOMAIN_ATTR_MAX,
 125 };
 126
 127 /* These are the possible reserved region types */
 128 enum iommu_resv_type {
 129         /* Memory regions which must be mapped 1:1 at all times */
 130         IOMMU_RESV_DIRECT,
 131         /* Arbitrary "never map this or give it to a device" address ranges */
 132         IOMMU_RESV_RESERVED,
 133         /* Hardware MSI region (untranslated) */
 134         IOMMU_RESV_MSI,
 135         /* Software-managed MSI translation window */
 136         IOMMU_RESV_SW_MSI,
 137 };
 138
 139 /**
 140  * struct iommu_resv_region - descriptor for a reserved memory region
 141  * @list: Linked list pointers
 142  * @start: System physical start address of the region
 143  * @length: Length of the region in bytes
 144  * @prot: IOMMU Protection flags (READ/WRITE/...)
 145  * @type: Type of the reserved region
 146  */
 147 struct iommu_resv_region {
 148         struct list_head        list;
 149         phys_addr_t             start;
 150         size_t                  length;
 151         int                     prot;
 152         enum iommu_resv_type    type;
 153 };
 154
 155 #ifdef CONFIG_IOMMU_API
 156
 157 /**
 158  * struct iommu_ops - iommu ops and capabilities
 159  * @capable: check capability
 160  * @domain_alloc: allocate iommu domain
 161  * @domain_free: free iommu domain
 162  * @attach_dev: attach device to an iommu domain
 163  * @detach_dev: detach device from an iommu domain
 164  * @map: map a physically contiguous memory region to an iommu domain
 165  * @unmap: unmap a physically contiguous memory region from an iommu domain
 166  * @map_sg: map a scatter-gather list of physically contiguous memory chunks
 167  * to an iommu domain
 168  * @iova_to_phys: translate iova to physical address
 169  * @add_device: add device to iommu grouping
 170  * @remove_device: remove device from iommu grouping
 171  * @device_group: find iommu group for a particular device
 172  * @domain_get_attr: Query domain attributes
 173  * @domain_set_attr: Change domain attributes
 174  * @get_resv_regions: Request list of reserved regions for a device
 175  * @put_resv_regions: Free list of reserved regions for a device
 176  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 177  * @domain_window_enable: Configure and enable a particular window for a domain
 178  * @domain_window_disable: Disable a particular window for a domain
 179  * @domain_set_windows: Set the number of windows for a domain
 180  * @domain_get_windows: Return the number of windows for a domain
 181  * @of_xlate: add OF master IDs to iommu grouping
 182  * @pgsize_bitmap: bitmap of all possible supported page sizes
 183  */
 184 struct iommu_ops {
 185         bool (*capable)(enum iommu_cap);
 186
 187         /* Domain allocation and freeing by the iommu driver */
 188         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 189         void (*domain_free)(struct iommu_domain *);
 190
 191         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 192         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 193         int (*map)(struct iommu_domain *domain, unsigned long iova,
 194                    phys_addr_t paddr, size_t size, int prot);
 195         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 196                      size_t size);
 197         size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
 198                          struct scatterlist *sg, unsigned int nents, int prot);
 199         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 200         int (*add_device)(struct device *dev);
 201         void (*remove_device)(struct device *dev);
 202         struct iommu_group *(*device_group)(struct device *dev);
 203         int (*domain_get_attr)(struct iommu_domain *domain,
 204                                enum iommu_attr attr, void *data);
 205         int (*domain_set_attr)(struct iommu_domain *domain,
 206                                enum iommu_attr attr, void *data);
 207
 208         /* Request/Free a list of reserved regions for a device */
 209         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 210         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 211         void (*apply_resv_region)(struct device *dev,
 212                                   struct iommu_domain *domain,
 213                                   struct iommu_resv_region *region);
 214
 215         /* Window handling functions */
 216         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 217                                     phys_addr_t paddr, u64 size, int prot);
 218         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 219         /* Set the number of windows per domain */
 220         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 221         /* Get the number of windows per domain */
 222         u32 (*domain_get_windows)(struct iommu_domain *domain);
 223
 224         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 225
 226         unsigned long pgsize_bitmap;
 227 };
 228
 229 /**
 230  * struct iommu_device - IOMMU core representation of one IOMMU hardware
 231  *                       instance
 232  * @list: Used by the iommu-core to keep a list of registered iommus
 233  * @ops: iommu-ops for talking to this iommu
 234  * @dev: struct device for sysfs handling
 235  */
 236 struct iommu_device {
 237         struct list_head list;
 238         const struct iommu_ops *ops;
 239         struct fwnode_handle *fwnode;
 240         struct device dev;
 241 };
 242
 243 int  iommu_device_register(struct iommu_device *iommu);
 244 void iommu_device_unregister(struct iommu_device *iommu);
 245 int  iommu_device_sysfs_add(struct iommu_device *iommu,
 246                             struct device *parent,
 247                             const struct attribute_group **groups,
 248                             const char *fmt, ...) __printf(4, 5);
 249 void iommu_device_sysfs_remove(struct iommu_device *iommu);
 250 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
 251 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
 252
 253 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 254                                         const struct iommu_ops *ops)
 255 {
 256         iommu->ops = ops;
 257 }
 258
 259 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 260                                            struct fwnode_handle *fwnode)
 261 {
 262         iommu->fwnode = fwnode;
 263 }
 264
 265 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 266 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 267 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 268 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 269 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 270 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 271
 272 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 273 extern bool iommu_present(struct bus_type *bus);
 274 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 275 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 276 extern struct iommu_group *iommu_group_get_by_id(int id);
 277 extern void iommu_domain_free(struct iommu_domain *domain);
 278 extern int iommu_attach_device(struct iommu_domain *domain,
 279                                struct device *dev);
 280 extern void iommu_detach_device(struct iommu_domain *domain,
 281                                 struct device *dev);
 282 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 283 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 284                      phys_addr_t paddr, size_t size, int prot);
 285 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 286                        size_t size);
 287 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 288                                 struct scatterlist *sg,unsigned int nents,
 289                                 int prot);
 290 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 291 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 292                         iommu_fault_handler_t handler, void *token);
 293
 294 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 295 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 296 extern int iommu_request_dm_for_dev(struct device *dev);
 297 extern struct iommu_resv_region *
 298 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 299                         enum iommu_resv_type type);
 300 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 301                                         struct list_head *head);
 302
 303 extern int iommu_attach_group(struct iommu_domain *domain,
 304                               struct iommu_group *group);
 305 extern void iommu_detach_group(struct iommu_domain *domain,
 306                                struct iommu_group *group);
 307 extern struct iommu_group *iommu_group_alloc(void);
 308 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 309 extern void iommu_group_set_iommudata(struct iommu_group *group,
 310                                       void *iommu_data,
 311                                       void (*release)(void *iommu_data));
 312 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 313 extern int iommu_group_add_device(struct iommu_group *group,
 314                                   struct device *dev);
 315 extern void iommu_group_remove_device(struct device *dev);
 316 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 317                                     int (*fn)(struct device *, void *));
 318 extern struct iommu_group *iommu_group_get(struct device *dev);
 319 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 320 extern void iommu_group_put(struct iommu_group *group);
 321 extern int iommu_group_register_notifier(struct iommu_group *group,
 322                                          struct notifier_block *nb);
 323 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 324                                            struct notifier_block *nb);
 325 extern int iommu_group_id(struct iommu_group *group);
 326 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 327 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 328
 329 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 330                                  void *data);
 331 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 332                                  void *data);
 333
 334 /* Window handling function prototypes */
 335 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 336                                       phys_addr_t offset, u64 size,
 337                                       int prot);
 338 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 339 /**
 340  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
 341  * @domain: the iommu domain where the fault has happened
 342  * @dev: the device where the fault has happened
 343  * @iova: the faulting address
 344  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
 345  *
 346  * This function should be called by the low-level IOMMU implementations
 347  * whenever IOMMU faults happen, to allow high-level users, that are
 348  * interested in such events, to know about them.
 349  *
 350  * This event may be useful for several possible use cases:
 351  * - mere logging of the event
 352  * - dynamic TLB/PTE loading
 353  * - if restarting of the faulting device is required
 354  *
 355  * Returns 0 on success and an appropriate error code otherwise (if dynamic
 356  * PTE/TLB loading will one day be supported, implementations will be able
 357  * to tell whether it succeeded or not according to this return value).
 358  *
 359  * Specifically, -ENOSYS is returned if a fault handler isn't installed
 360  * (though fault handlers can also return -ENOSYS, in case they want to
 361  * elicit the default behavior of the IOMMU drivers).
 362  */
 363 static inline int report_iommu_fault(struct iommu_domain *domain,
 364                 struct device *dev, unsigned long iova, int flags)
 365 {
 366         int ret = -ENOSYS;
 367
 368         /*
 369          * if upper layers showed interest and installed a fault handler,
 370          * invoke it.
 371          */
 372         if (domain->handler)
 373                 ret = domain->handler(domain, dev, iova, flags,
 374                                                 domain->handler_token);
 375
 376         trace_io_page_fault(dev, iova, flags);
 377         return ret;
 378 }
 379
 380 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 381                                   unsigned long iova, struct scatterlist *sg,
 382                                   unsigned int nents, int prot)
 383 {
 384         return domain->ops->map_sg(domain, iova, sg, nents, prot);
 385 }
 386
 387 /* PCI device grouping function */
 388 extern struct iommu_group *pci_device_group(struct device *dev);
 389 /* Generic device grouping function */
 390 extern struct iommu_group *generic_device_group(struct device *dev);
 391
 392 /**
 393  * struct iommu_fwspec - per-device IOMMU instance data
 394  * @ops: ops for this device's IOMMU
 395  * @iommu_fwnode: firmware handle for this device's IOMMU
 396  * @iommu_priv: IOMMU driver private data for this device
 397  * @num_ids: number of associated device IDs
 398  * @ids: IDs which this device may present to the IOMMU
 399  */
 400 struct iommu_fwspec {
 401         const struct iommu_ops  *ops;
 402         struct fwnode_handle    *iommu_fwnode;
 403         void                    *iommu_priv;
 404         unsigned int            num_ids;
 405         u32                     ids[1];
 406 };
 407
 408 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 409                       const struct iommu_ops *ops);
 410 void iommu_fwspec_free(struct device *dev);
 411 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 412 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 413
 414 #else /* CONFIG_IOMMU_API */
 415
 416 struct iommu_ops {};
 417 struct iommu_group {};
 418 struct iommu_fwspec {};
 419 struct iommu_device {};
 420
 421 static inline bool iommu_present(struct bus_type *bus)
 422 {
 423         return false;
 424 }
 425
 426 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 427 {
 428         return false;
 429 }
 430
 431 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 432 {
 433         return NULL;
 434 }
 435
 436 static inline struct iommu_group *iommu_group_get_by_id(int id)
 437 {
 438         return NULL;
 439 }
 440
 441 static inline void iommu_domain_free(struct iommu_domain *domain)
 442 {
 443 }
 444
 445 static inline int iommu_attach_device(struct iommu_domain *domain,
 446                                       struct device *dev)
 447 {
 448         return -ENODEV;
 449 }
 450
 451 static inline void iommu_detach_device(struct iommu_domain *domain,
 452                                        struct device *dev)
 453 {
 454 }
 455
 456 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 457 {
 458         return NULL;
 459 }
 460
 461 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 462                             phys_addr_t paddr, int gfp_order, int prot)
 463 {
 464         return -ENODEV;
 465 }
 466
 467 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 468                               int gfp_order)
 469 {
 470         return -ENODEV;
 471 }
 472
 473 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 474                                   unsigned long iova, struct scatterlist *sg,
 475                                   unsigned int nents, int prot)
 476 {
 477         return -ENODEV;
 478 }
 479
 480 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 481                                              u32 wnd_nr, phys_addr_t paddr,
 482                                              u64 size, int prot)
 483 {
 484         return -ENODEV;
 485 }
 486
 487 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 488                                                u32 wnd_nr)
 489 {
 490 }
 491
 492 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 493 {
 494         return 0;
 495 }
 496
 497 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 498                                 iommu_fault_handler_t handler, void *token)
 499 {
 500 }
 501
 502 static inline void iommu_get_resv_regions(struct device *dev,
 503                                         struct list_head *list)
 504 {
 505 }
 506
 507 static inline void iommu_put_resv_regions(struct device *dev,
 508                                         struct list_head *list)
 509 {
 510 }
 511
 512 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 513                                                struct list_head *head)
 514 {
 515         return -ENODEV;
 516 }
 517
 518 static inline int iommu_request_dm_for_dev(struct device *dev)
 519 {
 520         return -ENODEV;
 521 }
 522
 523 static inline int iommu_attach_group(struct iommu_domain *domain,
 524                                      struct iommu_group *group)
 525 {
 526         return -ENODEV;
 527 }
 528
 529 static inline void iommu_detach_group(struct iommu_domain *domain,
 530                                       struct iommu_group *group)
 531 {
 532 }
 533
 534 static inline struct iommu_group *iommu_group_alloc(void)
 535 {
 536         return ERR_PTR(-ENODEV);
 537 }
 538
 539 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 540 {
 541         return NULL;
 542 }
 543
 544 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 545                                              void *iommu_data,
 546                                              void (*release)(void *iommu_data))
 547 {
 548 }
 549
 550 static inline int iommu_group_set_name(struct iommu_group *group,
 551                                        const char *name)
 552 {
 553         return -ENODEV;
 554 }
 555
 556 static inline int iommu_group_add_device(struct iommu_group *group,
 557                                          struct device *dev)
 558 {
 559         return -ENODEV;
 560 }
 561
 562 static inline void iommu_group_remove_device(struct device *dev)
 563 {
 564 }
 565
 566 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 567                                            void *data,
 568                                            int (*fn)(struct device *, void *))
 569 {
 570         return -ENODEV;
 571 }
 572
 573 static inline struct iommu_group *iommu_group_get(struct device *dev)
 574 {
 575         return NULL;
 576 }
 577
 578 static inline void iommu_group_put(struct iommu_group *group)
 579 {
 580 }
 581
 582 static inline int iommu_group_register_notifier(struct iommu_group *group,
 583                                                 struct notifier_block *nb)
 584 {
 585         return -ENODEV;
 586 }
 587
 588 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 589                                                   struct notifier_block *nb)
 590 {
 591         return 0;
 592 }
 593
 594 static inline int iommu_group_id(struct iommu_group *group)
 595 {
 596         return -ENODEV;
 597 }
 598
 599 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 600                                         enum iommu_attr attr, void *data)
 601 {
 602         return -EINVAL;
 603 }
 604
 605 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 606                                         enum iommu_attr attr, void *data)
 607 {
 608         return -EINVAL;
 609 }
 610
 611 static inline int  iommu_device_register(struct iommu_device *iommu)
 612 {
 613         return -ENODEV;
 614 }
 615
 616 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 617                                         const struct iommu_ops *ops)
 618 {
 619 }
 620
 621 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 622                                            struct fwnode_handle *fwnode)
 623 {
 624 }
 625
 626 static inline void iommu_device_unregister(struct iommu_device *iommu)
 627 {
 628 }
 629
 630 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
 631                                           struct device *parent,
 632                                           const struct attribute_group **groups,
 633                                           const char *fmt, ...)
 634 {
 635         return -ENODEV;
 636 }
 637
 638 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
 639 {
 640 }
 641
 642 static inline int iommu_device_link(struct device *dev, struct device *link)
 643 {
 644         return -EINVAL;
 645 }
 646
 647 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 648 {
 649 }
 650
 651 static inline int iommu_fwspec_init(struct device *dev,
 652                                     struct fwnode_handle *iommu_fwnode,
 653                                     const struct iommu_ops *ops)
 654 {
 655         return -ENODEV;
 656 }
 657
 658 static inline void iommu_fwspec_free(struct device *dev)
 659 {
 660 }
 661
 662 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 663                                        int num_ids)
 664 {
 665         return -ENODEV;
 666 }
 667
 668 static inline
 669 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 670 {
 671         return NULL;
 672 }
 673
 674 #endif /* CONFIG_IOMMU_API */
 675
 676 #endif /* __LINUX_IOMMU_H */