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