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 #define IOMMU_RESV_DIRECT       (1 << 0)
 129 #define IOMMU_RESV_RESERVED     (1 << 1)
 130 #define IOMMU_RESV_MSI          (1 << 2)
 131
 132 /**
 133  * struct iommu_resv_region - descriptor for a reserved memory region
 134  * @list: Linked list pointers
 135  * @start: System physical start address of the region
 136  * @length: Length of the region in bytes
 137  * @prot: IOMMU Protection flags (READ/WRITE/...)
 138  * @type: Type of the reserved region
 139  */
 140 struct iommu_resv_region {
 141         struct list_head        list;
 142         phys_addr_t             start;
 143         size_t                  length;
 144         int                     prot;
 145         int                     type;
 146 };
 147
 148 #ifdef CONFIG_IOMMU_API
 149
 150 /**
 151  * struct iommu_ops - iommu ops and capabilities
 152  * @capable: check capability
 153  * @domain_alloc: allocate iommu domain
 154  * @domain_free: free iommu domain
 155  * @attach_dev: attach device to an iommu domain
 156  * @detach_dev: detach device from an iommu domain
 157  * @map: map a physically contiguous memory region to an iommu domain
 158  * @unmap: unmap a physically contiguous memory region from an iommu domain
 159  * @map_sg: map a scatter-gather list of physically contiguous memory chunks
 160  * to an iommu domain
 161  * @iova_to_phys: translate iova to physical address
 162  * @add_device: add device to iommu grouping
 163  * @remove_device: remove device from iommu grouping
 164  * @device_group: find iommu group for a particular device
 165  * @domain_get_attr: Query domain attributes
 166  * @domain_set_attr: Change domain attributes
 167  * @get_resv_regions: Request list of reserved regions for a device
 168  * @put_resv_regions: Free list of reserved regions for a device
 169  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 170  * @domain_window_enable: Configure and enable a particular window for a domain
 171  * @domain_window_disable: Disable a particular window for a domain
 172  * @domain_set_windows: Set the number of windows for a domain
 173  * @domain_get_windows: Return the number of windows for a domain
 174  * @of_xlate: add OF master IDs to iommu grouping
 175  * @pgsize_bitmap: bitmap of all possible supported page sizes
 176  */
 177 struct iommu_ops {
 178         bool (*capable)(enum iommu_cap);
 179
 180         /* Domain allocation and freeing by the iommu driver */
 181         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 182         void (*domain_free)(struct iommu_domain *);
 183
 184         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 185         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 186         int (*map)(struct iommu_domain *domain, unsigned long iova,
 187                    phys_addr_t paddr, size_t size, int prot);
 188         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 189                      size_t size);
 190         size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
 191                          struct scatterlist *sg, unsigned int nents, int prot);
 192         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 193         int (*add_device)(struct device *dev);
 194         void (*remove_device)(struct device *dev);
 195         struct iommu_group *(*device_group)(struct device *dev);
 196         int (*domain_get_attr)(struct iommu_domain *domain,
 197                                enum iommu_attr attr, void *data);
 198         int (*domain_set_attr)(struct iommu_domain *domain,
 199                                enum iommu_attr attr, void *data);
 200
 201         /* Request/Free a list of reserved regions for a device */
 202         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 203         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 204         void (*apply_resv_region)(struct device *dev,
 205                                   struct iommu_domain *domain,
 206                                   struct iommu_resv_region *region);
 207
 208         /* Window handling functions */
 209         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 210                                     phys_addr_t paddr, u64 size, int prot);
 211         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 212         /* Set the number of windows per domain */
 213         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 214         /* Get the number of windows per domain */
 215         u32 (*domain_get_windows)(struct iommu_domain *domain);
 216
 217         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 218
 219         unsigned long pgsize_bitmap;
 220 };
 221
 222 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 223 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 224 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 225 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 226 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 227 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 228
 229 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 230 extern bool iommu_present(struct bus_type *bus);
 231 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 232 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 233 extern struct iommu_group *iommu_group_get_by_id(int id);
 234 extern void iommu_domain_free(struct iommu_domain *domain);
 235 extern int iommu_attach_device(struct iommu_domain *domain,
 236                                struct device *dev);
 237 extern void iommu_detach_device(struct iommu_domain *domain,
 238                                 struct device *dev);
 239 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 240 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 241                      phys_addr_t paddr, size_t size, int prot);
 242 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 243                        size_t size);
 244 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 245                                 struct scatterlist *sg,unsigned int nents,
 246                                 int prot);
 247 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 248 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 249                         iommu_fault_handler_t handler, void *token);
 250
 251 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 252 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 253 extern int iommu_request_dm_for_dev(struct device *dev);
 254 extern struct iommu_resv_region *
 255 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, int type);
 256 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 257                                         struct list_head *head);
 258
 259 extern int iommu_attach_group(struct iommu_domain *domain,
 260                               struct iommu_group *group);
 261 extern void iommu_detach_group(struct iommu_domain *domain,
 262                                struct iommu_group *group);
 263 extern struct iommu_group *iommu_group_alloc(void);
 264 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 265 extern void iommu_group_set_iommudata(struct iommu_group *group,
 266                                       void *iommu_data,
 267                                       void (*release)(void *iommu_data));
 268 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 269 extern int iommu_group_add_device(struct iommu_group *group,
 270                                   struct device *dev);
 271 extern void iommu_group_remove_device(struct device *dev);
 272 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 273                                     int (*fn)(struct device *, void *));
 274 extern struct iommu_group *iommu_group_get(struct device *dev);
 275 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 276 extern void iommu_group_put(struct iommu_group *group);
 277 extern int iommu_group_register_notifier(struct iommu_group *group,
 278                                          struct notifier_block *nb);
 279 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 280                                            struct notifier_block *nb);
 281 extern int iommu_group_id(struct iommu_group *group);
 282 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 283 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 284
 285 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 286                                  void *data);
 287 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 288                                  void *data);
 289 struct device *iommu_device_create(struct device *parent, void *drvdata,
 290                                    const struct attribute_group **groups,
 291                                    const char *fmt, ...) __printf(4, 5);
 292 void iommu_device_destroy(struct device *dev);
 293 int iommu_device_link(struct device *dev, struct device *link);
 294 void iommu_device_unlink(struct device *dev, struct device *link);
 295
 296 /* Window handling function prototypes */
 297 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 298                                       phys_addr_t offset, u64 size,
 299                                       int prot);
 300 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 301 /**
 302  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
 303  * @domain: the iommu domain where the fault has happened
 304  * @dev: the device where the fault has happened
 305  * @iova: the faulting address
 306  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
 307  *
 308  * This function should be called by the low-level IOMMU implementations
 309  * whenever IOMMU faults happen, to allow high-level users, that are
 310  * interested in such events, to know about them.
 311  *
 312  * This event may be useful for several possible use cases:
 313  * - mere logging of the event
 314  * - dynamic TLB/PTE loading
 315  * - if restarting of the faulting device is required
 316  *
 317  * Returns 0 on success and an appropriate error code otherwise (if dynamic
 318  * PTE/TLB loading will one day be supported, implementations will be able
 319  * to tell whether it succeeded or not according to this return value).
 320  *
 321  * Specifically, -ENOSYS is returned if a fault handler isn't installed
 322  * (though fault handlers can also return -ENOSYS, in case they want to
 323  * elicit the default behavior of the IOMMU drivers).
 324  */
 325 static inline int report_iommu_fault(struct iommu_domain *domain,
 326                 struct device *dev, unsigned long iova, int flags)
 327 {
 328         int ret = -ENOSYS;
 329
 330         /*
 331          * if upper layers showed interest and installed a fault handler,
 332          * invoke it.
 333          */
 334         if (domain->handler)
 335                 ret = domain->handler(domain, dev, iova, flags,
 336                                                 domain->handler_token);
 337
 338         trace_io_page_fault(dev, iova, flags);
 339         return ret;
 340 }
 341
 342 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 343                                   unsigned long iova, struct scatterlist *sg,
 344                                   unsigned int nents, int prot)
 345 {
 346         return domain->ops->map_sg(domain, iova, sg, nents, prot);
 347 }
 348
 349 /* PCI device grouping function */
 350 extern struct iommu_group *pci_device_group(struct device *dev);
 351 /* Generic device grouping function */
 352 extern struct iommu_group *generic_device_group(struct device *dev);
 353
 354 /**
 355  * struct iommu_fwspec - per-device IOMMU instance data
 356  * @ops: ops for this device's IOMMU
 357  * @iommu_fwnode: firmware handle for this device's IOMMU
 358  * @iommu_priv: IOMMU driver private data for this device
 359  * @num_ids: number of associated device IDs
 360  * @ids: IDs which this device may present to the IOMMU
 361  */
 362 struct iommu_fwspec {
 363         const struct iommu_ops  *ops;
 364         struct fwnode_handle    *iommu_fwnode;
 365         void                    *iommu_priv;
 366         unsigned int            num_ids;
 367         u32                     ids[1];
 368 };
 369
 370 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 371                       const struct iommu_ops *ops);
 372 void iommu_fwspec_free(struct device *dev);
 373 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 374 void iommu_register_instance(struct fwnode_handle *fwnode,
 375                              const struct iommu_ops *ops);
 376 const struct iommu_ops *iommu_get_instance(struct fwnode_handle *fwnode);
 377
 378 #else /* CONFIG_IOMMU_API */
 379
 380 struct iommu_ops {};
 381 struct iommu_group {};
 382 struct iommu_fwspec {};
 383
 384 static inline bool iommu_present(struct bus_type *bus)
 385 {
 386         return false;
 387 }
 388
 389 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 390 {
 391         return false;
 392 }
 393
 394 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 395 {
 396         return NULL;
 397 }
 398
 399 static inline struct iommu_group *iommu_group_get_by_id(int id)
 400 {
 401         return NULL;
 402 }
 403
 404 static inline void iommu_domain_free(struct iommu_domain *domain)
 405 {
 406 }
 407
 408 static inline int iommu_attach_device(struct iommu_domain *domain,
 409                                       struct device *dev)
 410 {
 411         return -ENODEV;
 412 }
 413
 414 static inline void iommu_detach_device(struct iommu_domain *domain,
 415                                        struct device *dev)
 416 {
 417 }
 418
 419 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 420 {
 421         return NULL;
 422 }
 423
 424 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 425                             phys_addr_t paddr, int gfp_order, int prot)
 426 {
 427         return -ENODEV;
 428 }
 429
 430 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 431                               int gfp_order)
 432 {
 433         return -ENODEV;
 434 }
 435
 436 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 437                                   unsigned long iova, struct scatterlist *sg,
 438                                   unsigned int nents, int prot)
 439 {
 440         return -ENODEV;
 441 }
 442
 443 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 444                                              u32 wnd_nr, phys_addr_t paddr,
 445                                              u64 size, int prot)
 446 {
 447         return -ENODEV;
 448 }
 449
 450 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 451                                                u32 wnd_nr)
 452 {
 453 }
 454
 455 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 456 {
 457         return 0;
 458 }
 459
 460 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 461                                 iommu_fault_handler_t handler, void *token)
 462 {
 463 }
 464
 465 static inline void iommu_get_resv_regions(struct device *dev,
 466                                         struct list_head *list)
 467 {
 468 }
 469
 470 static inline void iommu_put_resv_regions(struct device *dev,
 471                                         struct list_head *list)
 472 {
 473 }
 474
 475 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 476                                                struct list_head *head)
 477 {
 478         return -ENODEV;
 479 }
 480
 481 static inline int iommu_request_dm_for_dev(struct device *dev)
 482 {
 483         return -ENODEV;
 484 }
 485
 486 static inline int iommu_attach_group(struct iommu_domain *domain,
 487                                      struct iommu_group *group)
 488 {
 489         return -ENODEV;
 490 }
 491
 492 static inline void iommu_detach_group(struct iommu_domain *domain,
 493                                       struct iommu_group *group)
 494 {
 495 }
 496
 497 static inline struct iommu_group *iommu_group_alloc(void)
 498 {
 499         return ERR_PTR(-ENODEV);
 500 }
 501
 502 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 503 {
 504         return NULL;
 505 }
 506
 507 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 508                                              void *iommu_data,
 509                                              void (*release)(void *iommu_data))
 510 {
 511 }
 512
 513 static inline int iommu_group_set_name(struct iommu_group *group,
 514                                        const char *name)
 515 {
 516         return -ENODEV;
 517 }
 518
 519 static inline int iommu_group_add_device(struct iommu_group *group,
 520                                          struct device *dev)
 521 {
 522         return -ENODEV;
 523 }
 524
 525 static inline void iommu_group_remove_device(struct device *dev)
 526 {
 527 }
 528
 529 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 530                                            void *data,
 531                                            int (*fn)(struct device *, void *))
 532 {
 533         return -ENODEV;
 534 }
 535
 536 static inline struct iommu_group *iommu_group_get(struct device *dev)
 537 {
 538         return NULL;
 539 }
 540
 541 static inline void iommu_group_put(struct iommu_group *group)
 542 {
 543 }
 544
 545 static inline int iommu_group_register_notifier(struct iommu_group *group,
 546                                                 struct notifier_block *nb)
 547 {
 548         return -ENODEV;
 549 }
 550
 551 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 552                                                   struct notifier_block *nb)
 553 {
 554         return 0;
 555 }
 556
 557 static inline int iommu_group_id(struct iommu_group *group)
 558 {
 559         return -ENODEV;
 560 }
 561
 562 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 563                                         enum iommu_attr attr, void *data)
 564 {
 565         return -EINVAL;
 566 }
 567
 568 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 569                                         enum iommu_attr attr, void *data)
 570 {
 571         return -EINVAL;
 572 }
 573
 574 static inline struct device *iommu_device_create(struct device *parent,
 575                                         void *drvdata,
 576                                         const struct attribute_group **groups,
 577                                         const char *fmt, ...)
 578 {
 579         return ERR_PTR(-ENODEV);
 580 }
 581
 582 static inline void iommu_device_destroy(struct device *dev)
 583 {
 584 }
 585
 586 static inline int iommu_device_link(struct device *dev, struct device *link)
 587 {
 588         return -EINVAL;
 589 }
 590
 591 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 592 {
 593 }
 594
 595 static inline int iommu_fwspec_init(struct device *dev,
 596                                     struct fwnode_handle *iommu_fwnode,
 597                                     const struct iommu_ops *ops)
 598 {
 599         return -ENODEV;
 600 }
 601
 602 static inline void iommu_fwspec_free(struct device *dev)
 603 {
 604 }
 605
 606 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 607                                        int num_ids)
 608 {
 609         return -ENODEV;
 610 }
 611
 612 static inline void iommu_register_instance(struct fwnode_handle *fwnode,
 613                                            const struct iommu_ops *ops)
 614 {
 615 }
 616
 617 static inline
 618 const struct iommu_ops *iommu_get_instance(struct fwnode_handle *fwnode)
 619 {
 620         return NULL;
 621 }
 622
 623 #endif /* CONFIG_IOMMU_API */
 624
 625 #endif /* __LINUX_IOMMU_H */