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