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  * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain
 170  * @tlb_range_add: Add a given iova range to the flush queue for this domain
 171  * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
 172  *            queue
 173  * @iova_to_phys: translate iova to physical address
 174  * @add_device: add device to iommu grouping
 175  * @remove_device: remove device from iommu grouping
 176  * @device_group: find iommu group for a particular device
 177  * @domain_get_attr: Query domain attributes
 178  * @domain_set_attr: Change domain attributes
 179  * @get_resv_regions: Request list of reserved regions for a device
 180  * @put_resv_regions: Free list of reserved regions for a device
 181  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 182  * @domain_window_enable: Configure and enable a particular window for a domain
 183  * @domain_window_disable: Disable a particular window for a domain
 184  * @domain_set_windows: Set the number of windows for a domain
 185  * @domain_get_windows: Return the number of windows for a domain
 186  * @of_xlate: add OF master IDs to iommu grouping
 187  * @pgsize_bitmap: bitmap of all possible supported page sizes
 188  */
 189 struct iommu_ops {
 190         bool (*capable)(enum iommu_cap);
 191
 192         /* Domain allocation and freeing by the iommu driver */
 193         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 194         void (*domain_free)(struct iommu_domain *);
 195
 196         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 197         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 198         int (*map)(struct iommu_domain *domain, unsigned long iova,
 199                    phys_addr_t paddr, size_t size, int prot);
 200         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 201                      size_t size);
 202         void (*flush_iotlb_all)(struct iommu_domain *domain);
 203         void (*iotlb_range_add)(struct iommu_domain *domain,
 204                                 unsigned long iova, size_t size);
 205         void (*iotlb_sync)(struct iommu_domain *domain);
 206         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 207         int (*add_device)(struct device *dev);
 208         void (*remove_device)(struct device *dev);
 209         struct iommu_group *(*device_group)(struct device *dev);
 210         int (*domain_get_attr)(struct iommu_domain *domain,
 211                                enum iommu_attr attr, void *data);
 212         int (*domain_set_attr)(struct iommu_domain *domain,
 213                                enum iommu_attr attr, void *data);
 214
 215         /* Request/Free a list of reserved regions for a device */
 216         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 217         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 218         void (*apply_resv_region)(struct device *dev,
 219                                   struct iommu_domain *domain,
 220                                   struct iommu_resv_region *region);
 221
 222         /* Window handling functions */
 223         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 224                                     phys_addr_t paddr, u64 size, int prot);
 225         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 226         /* Set the number of windows per domain */
 227         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 228         /* Get the number of windows per domain */
 229         u32 (*domain_get_windows)(struct iommu_domain *domain);
 230
 231         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 232         bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 233
 234         unsigned long pgsize_bitmap;
 235 };
 236
 237 /**
 238  * struct iommu_device - IOMMU core representation of one IOMMU hardware
 239  *                       instance
 240  * @list: Used by the iommu-core to keep a list of registered iommus
 241  * @ops: iommu-ops for talking to this iommu
 242  * @dev: struct device for sysfs handling
 243  */
 244 struct iommu_device {
 245         struct list_head list;
 246         const struct iommu_ops *ops;
 247         struct fwnode_handle *fwnode;
 248         struct device *dev;
 249 };
 250
 251 int  iommu_device_register(struct iommu_device *iommu);
 252 void iommu_device_unregister(struct iommu_device *iommu);
 253 int  iommu_device_sysfs_add(struct iommu_device *iommu,
 254                             struct device *parent,
 255                             const struct attribute_group **groups,
 256                             const char *fmt, ...) __printf(4, 5);
 257 void iommu_device_sysfs_remove(struct iommu_device *iommu);
 258 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
 259 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
 260
 261 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 262                                         const struct iommu_ops *ops)
 263 {
 264         iommu->ops = ops;
 265 }
 266
 267 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 268                                            struct fwnode_handle *fwnode)
 269 {
 270         iommu->fwnode = fwnode;
 271 }
 272
 273 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 274 {
 275         return (struct iommu_device *)dev_get_drvdata(dev);
 276 }
 277
 278 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 279 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 280 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 281 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 282 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 283 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 284
 285 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 286 extern bool iommu_present(struct bus_type *bus);
 287 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 288 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 289 extern struct iommu_group *iommu_group_get_by_id(int id);
 290 extern void iommu_domain_free(struct iommu_domain *domain);
 291 extern int iommu_attach_device(struct iommu_domain *domain,
 292                                struct device *dev);
 293 extern void iommu_detach_device(struct iommu_domain *domain,
 294                                 struct device *dev);
 295 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 296 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 297                      phys_addr_t paddr, size_t size, int prot);
 298 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 299                           size_t size);
 300 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
 301                                unsigned long iova, size_t size);
 302 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 303                            struct scatterlist *sg,unsigned int nents, int prot);
 304 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 305 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 306                         iommu_fault_handler_t handler, void *token);
 307
 308 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 309 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 310 extern int iommu_request_dm_for_dev(struct device *dev);
 311 extern struct iommu_resv_region *
 312 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 313                         enum iommu_resv_type type);
 314 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 315                                         struct list_head *head);
 316
 317 extern int iommu_attach_group(struct iommu_domain *domain,
 318                               struct iommu_group *group);
 319 extern void iommu_detach_group(struct iommu_domain *domain,
 320                                struct iommu_group *group);
 321 extern struct iommu_group *iommu_group_alloc(void);
 322 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 323 extern void iommu_group_set_iommudata(struct iommu_group *group,
 324                                       void *iommu_data,
 325                                       void (*release)(void *iommu_data));
 326 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 327 extern int iommu_group_add_device(struct iommu_group *group,
 328                                   struct device *dev);
 329 extern void iommu_group_remove_device(struct device *dev);
 330 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 331                                     int (*fn)(struct device *, void *));
 332 extern struct iommu_group *iommu_group_get(struct device *dev);
 333 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 334 extern void iommu_group_put(struct iommu_group *group);
 335 extern int iommu_group_register_notifier(struct iommu_group *group,
 336                                          struct notifier_block *nb);
 337 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 338                                            struct notifier_block *nb);
 339 extern int iommu_group_id(struct iommu_group *group);
 340 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 341 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 342
 343 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 344                                  void *data);
 345 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 346                                  void *data);
 347
 348 /* Window handling function prototypes */
 349 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 350                                       phys_addr_t offset, u64 size,
 351                                       int prot);
 352 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 353
 354 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 355                               unsigned long iova, int flags);
 356
 357 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 358 {
 359         if (domain->ops->flush_iotlb_all)
 360                 domain->ops->flush_iotlb_all(domain);
 361 }
 362
 363 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 364                                        unsigned long iova, size_t size)
 365 {
 366         if (domain->ops->iotlb_range_add)
 367                 domain->ops->iotlb_range_add(domain, iova, size);
 368 }
 369
 370 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 371 {
 372         if (domain->ops->iotlb_sync)
 373                 domain->ops->iotlb_sync(domain);
 374 }
 375
 376 /* PCI device grouping function */
 377 extern struct iommu_group *pci_device_group(struct device *dev);
 378 /* Generic device grouping function */
 379 extern struct iommu_group *generic_device_group(struct device *dev);
 380
 381 /**
 382  * struct iommu_fwspec - per-device IOMMU instance data
 383  * @ops: ops for this device's IOMMU
 384  * @iommu_fwnode: firmware handle for this device's IOMMU
 385  * @iommu_priv: IOMMU driver private data for this device
 386  * @num_ids: number of associated device IDs
 387  * @ids: IDs which this device may present to the IOMMU
 388  */
 389 struct iommu_fwspec {
 390         const struct iommu_ops  *ops;
 391         struct fwnode_handle    *iommu_fwnode;
 392         void                    *iommu_priv;
 393         unsigned int            num_ids;
 394         u32                     ids[1];
 395 };
 396
 397 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 398                       const struct iommu_ops *ops);
 399 void iommu_fwspec_free(struct device *dev);
 400 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 401 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 402
 403 #else /* CONFIG_IOMMU_API */
 404
 405 struct iommu_ops {};
 406 struct iommu_group {};
 407 struct iommu_fwspec {};
 408 struct iommu_device {};
 409
 410 static inline bool iommu_present(struct bus_type *bus)
 411 {
 412         return false;
 413 }
 414
 415 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 416 {
 417         return false;
 418 }
 419
 420 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 421 {
 422         return NULL;
 423 }
 424
 425 static inline struct iommu_group *iommu_group_get_by_id(int id)
 426 {
 427         return NULL;
 428 }
 429
 430 static inline void iommu_domain_free(struct iommu_domain *domain)
 431 {
 432 }
 433
 434 static inline int iommu_attach_device(struct iommu_domain *domain,
 435                                       struct device *dev)
 436 {
 437         return -ENODEV;
 438 }
 439
 440 static inline void iommu_detach_device(struct iommu_domain *domain,
 441                                        struct device *dev)
 442 {
 443 }
 444
 445 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 446 {
 447         return NULL;
 448 }
 449
 450 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 451                             phys_addr_t paddr, size_t size, int prot)
 452 {
 453         return -ENODEV;
 454 }
 455
 456 static inline size_t iommu_unmap(struct iommu_domain *domain,
 457                                  unsigned long iova, size_t size)
 458 {
 459         return 0;
 460 }
 461
 462 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
 463                                       unsigned long iova, int gfp_order)
 464 {
 465         return 0;
 466 }
 467
 468 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 469                                   unsigned long iova, struct scatterlist *sg,
 470                                   unsigned int nents, int prot)
 471 {
 472         return 0;
 473 }
 474
 475 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 476 {
 477 }
 478
 479 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 480                                        unsigned long iova, size_t size)
 481 {
 482 }
 483
 484 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 485 {
 486 }
 487
 488 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 489                                              u32 wnd_nr, phys_addr_t paddr,
 490                                              u64 size, int prot)
 491 {
 492         return -ENODEV;
 493 }
 494
 495 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 496                                                u32 wnd_nr)
 497 {
 498 }
 499
 500 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 501 {
 502         return 0;
 503 }
 504
 505 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 506                                 iommu_fault_handler_t handler, void *token)
 507 {
 508 }
 509
 510 static inline void iommu_get_resv_regions(struct device *dev,
 511                                         struct list_head *list)
 512 {
 513 }
 514
 515 static inline void iommu_put_resv_regions(struct device *dev,
 516                                         struct list_head *list)
 517 {
 518 }
 519
 520 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 521                                                struct list_head *head)
 522 {
 523         return -ENODEV;
 524 }
 525
 526 static inline int iommu_request_dm_for_dev(struct device *dev)
 527 {
 528         return -ENODEV;
 529 }
 530
 531 static inline int iommu_attach_group(struct iommu_domain *domain,
 532                                      struct iommu_group *group)
 533 {
 534         return -ENODEV;
 535 }
 536
 537 static inline void iommu_detach_group(struct iommu_domain *domain,
 538                                       struct iommu_group *group)
 539 {
 540 }
 541
 542 static inline struct iommu_group *iommu_group_alloc(void)
 543 {
 544         return ERR_PTR(-ENODEV);
 545 }
 546
 547 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 548 {
 549         return NULL;
 550 }
 551
 552 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 553                                              void *iommu_data,
 554                                              void (*release)(void *iommu_data))
 555 {
 556 }
 557
 558 static inline int iommu_group_set_name(struct iommu_group *group,
 559                                        const char *name)
 560 {
 561         return -ENODEV;
 562 }
 563
 564 static inline int iommu_group_add_device(struct iommu_group *group,
 565                                          struct device *dev)
 566 {
 567         return -ENODEV;
 568 }
 569
 570 static inline void iommu_group_remove_device(struct device *dev)
 571 {
 572 }
 573
 574 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 575                                            void *data,
 576                                            int (*fn)(struct device *, void *))
 577 {
 578         return -ENODEV;
 579 }
 580
 581 static inline struct iommu_group *iommu_group_get(struct device *dev)
 582 {
 583         return NULL;
 584 }
 585
 586 static inline void iommu_group_put(struct iommu_group *group)
 587 {
 588 }
 589
 590 static inline int iommu_group_register_notifier(struct iommu_group *group,
 591                                                 struct notifier_block *nb)
 592 {
 593         return -ENODEV;
 594 }
 595
 596 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 597                                                   struct notifier_block *nb)
 598 {
 599         return 0;
 600 }
 601
 602 static inline int iommu_group_id(struct iommu_group *group)
 603 {
 604         return -ENODEV;
 605 }
 606
 607 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 608                                         enum iommu_attr attr, void *data)
 609 {
 610         return -EINVAL;
 611 }
 612
 613 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 614                                         enum iommu_attr attr, void *data)
 615 {
 616         return -EINVAL;
 617 }
 618
 619 static inline int  iommu_device_register(struct iommu_device *iommu)
 620 {
 621         return -ENODEV;
 622 }
 623
 624 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 625                                         const struct iommu_ops *ops)
 626 {
 627 }
 628
 629 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 630                                            struct fwnode_handle *fwnode)
 631 {
 632 }
 633
 634 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 635 {
 636         return NULL;
 637 }
 638
 639 static inline void iommu_device_unregister(struct iommu_device *iommu)
 640 {
 641 }
 642
 643 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
 644                                           struct device *parent,
 645                                           const struct attribute_group **groups,
 646                                           const char *fmt, ...)
 647 {
 648         return -ENODEV;
 649 }
 650
 651 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
 652 {
 653 }
 654
 655 static inline int iommu_device_link(struct device *dev, struct device *link)
 656 {
 657         return -EINVAL;
 658 }
 659
 660 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 661 {
 662 }
 663
 664 static inline int iommu_fwspec_init(struct device *dev,
 665                                     struct fwnode_handle *iommu_fwnode,
 666                                     const struct iommu_ops *ops)
 667 {
 668         return -ENODEV;
 669 }
 670
 671 static inline void iommu_fwspec_free(struct device *dev)
 672 {
 673 }
 674
 675 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 676                                        int num_ids)
 677 {
 678         return -ENODEV;
 679 }
 680
 681 static inline
 682 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 683 {
 684         return NULL;
 685 }
 686
 687 #endif /* CONFIG_IOMMU_API */
 688
 689 #ifdef CONFIG_IOMMU_DEBUGFS
 690 extern  struct dentry *iommu_debugfs_dir;
 691 void iommu_debugfs_setup(void);
 692 #else
 693 static inline void iommu_debugfs_setup(void) {}
 694 #endif
 695
 696 #endif /* __LINUX_IOMMU_H */