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  * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain
 172  * @tlb_range_add: Add a given iova range to the flush queue for this domain
 173  * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
 174  *            queue
 175  * @iova_to_phys: translate iova to physical address
 176  * @add_device: add device to iommu grouping
 177  * @remove_device: remove device from iommu grouping
 178  * @device_group: find iommu group for a particular device
 179  * @domain_get_attr: Query domain attributes
 180  * @domain_set_attr: Change domain attributes
 181  * @get_resv_regions: Request list of reserved regions for a device
 182  * @put_resv_regions: Free list of reserved regions for a device
 183  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 184  * @domain_window_enable: Configure and enable a particular window for a domain
 185  * @domain_window_disable: Disable a particular window for a domain
 186  * @domain_set_windows: Set the number of windows for a domain
 187  * @domain_get_windows: Return the number of windows for a domain
 188  * @of_xlate: add OF master IDs to iommu grouping
 189  * @pgsize_bitmap: bitmap of all possible supported page sizes
 190  */
 191 struct iommu_ops {
 192         bool (*capable)(enum iommu_cap);
 193
 194         /* Domain allocation and freeing by the iommu driver */
 195         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 196         void (*domain_free)(struct iommu_domain *);
 197
 198         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 199         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 200         int (*map)(struct iommu_domain *domain, unsigned long iova,
 201                    phys_addr_t paddr, size_t size, int prot);
 202         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 203                      size_t size);
 204         size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
 205                          struct scatterlist *sg, unsigned int nents, int prot);
 206         void (*flush_iotlb_all)(struct iommu_domain *domain);
 207         void (*iotlb_range_add)(struct iommu_domain *domain,
 208                                 unsigned long iova, size_t size);
 209         void (*iotlb_sync)(struct iommu_domain *domain);
 210         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 211         int (*add_device)(struct device *dev);
 212         void (*remove_device)(struct device *dev);
 213         struct iommu_group *(*device_group)(struct device *dev);
 214         int (*domain_get_attr)(struct iommu_domain *domain,
 215                                enum iommu_attr attr, void *data);
 216         int (*domain_set_attr)(struct iommu_domain *domain,
 217                                enum iommu_attr attr, void *data);
 218
 219         /* Request/Free a list of reserved regions for a device */
 220         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 221         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 222         void (*apply_resv_region)(struct device *dev,
 223                                   struct iommu_domain *domain,
 224                                   struct iommu_resv_region *region);
 225
 226         /* Window handling functions */
 227         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 228                                     phys_addr_t paddr, u64 size, int prot);
 229         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 230         /* Set the number of windows per domain */
 231         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 232         /* Get the number of windows per domain */
 233         u32 (*domain_get_windows)(struct iommu_domain *domain);
 234
 235         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 236         bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 237
 238         unsigned long pgsize_bitmap;
 239 };
 240
 241 /**
 242  * struct iommu_device - IOMMU core representation of one IOMMU hardware
 243  *                       instance
 244  * @list: Used by the iommu-core to keep a list of registered iommus
 245  * @ops: iommu-ops for talking to this iommu
 246  * @dev: struct device for sysfs handling
 247  */
 248 struct iommu_device {
 249         struct list_head list;
 250         const struct iommu_ops *ops;
 251         struct fwnode_handle *fwnode;
 252         struct device *dev;
 253 };
 254
 255 int  iommu_device_register(struct iommu_device *iommu);
 256 void iommu_device_unregister(struct iommu_device *iommu);
 257 int  iommu_device_sysfs_add(struct iommu_device *iommu,
 258                             struct device *parent,
 259                             const struct attribute_group **groups,
 260                             const char *fmt, ...) __printf(4, 5);
 261 void iommu_device_sysfs_remove(struct iommu_device *iommu);
 262 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
 263 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
 264
 265 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 266                                         const struct iommu_ops *ops)
 267 {
 268         iommu->ops = ops;
 269 }
 270
 271 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 272                                            struct fwnode_handle *fwnode)
 273 {
 274         iommu->fwnode = fwnode;
 275 }
 276
 277 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 278 {
 279         return (struct iommu_device *)dev_get_drvdata(dev);
 280 }
 281
 282 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 283 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 284 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 285 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 286 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 287 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 288
 289 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 290 extern bool iommu_present(struct bus_type *bus);
 291 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 292 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 293 extern struct iommu_group *iommu_group_get_by_id(int id);
 294 extern void iommu_domain_free(struct iommu_domain *domain);
 295 extern int iommu_attach_device(struct iommu_domain *domain,
 296                                struct device *dev);
 297 extern void iommu_detach_device(struct iommu_domain *domain,
 298                                 struct device *dev);
 299 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 300 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 301                      phys_addr_t paddr, size_t size, int prot);
 302 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 303                           size_t size);
 304 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
 305                                unsigned long iova, size_t size);
 306 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 307                                 struct scatterlist *sg,unsigned int nents,
 308                                 int prot);
 309 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 310 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 311                         iommu_fault_handler_t handler, void *token);
 312
 313 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 314 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 315 extern int iommu_request_dm_for_dev(struct device *dev);
 316 extern struct iommu_resv_region *
 317 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 318                         enum iommu_resv_type type);
 319 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 320                                         struct list_head *head);
 321
 322 extern int iommu_attach_group(struct iommu_domain *domain,
 323                               struct iommu_group *group);
 324 extern void iommu_detach_group(struct iommu_domain *domain,
 325                                struct iommu_group *group);
 326 extern struct iommu_group *iommu_group_alloc(void);
 327 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 328 extern void iommu_group_set_iommudata(struct iommu_group *group,
 329                                       void *iommu_data,
 330                                       void (*release)(void *iommu_data));
 331 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 332 extern int iommu_group_add_device(struct iommu_group *group,
 333                                   struct device *dev);
 334 extern void iommu_group_remove_device(struct device *dev);
 335 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 336                                     int (*fn)(struct device *, void *));
 337 extern struct iommu_group *iommu_group_get(struct device *dev);
 338 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 339 extern void iommu_group_put(struct iommu_group *group);
 340 extern int iommu_group_register_notifier(struct iommu_group *group,
 341                                          struct notifier_block *nb);
 342 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 343                                            struct notifier_block *nb);
 344 extern int iommu_group_id(struct iommu_group *group);
 345 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 346 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 347
 348 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 349                                  void *data);
 350 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 351                                  void *data);
 352
 353 /* Window handling function prototypes */
 354 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 355                                       phys_addr_t offset, u64 size,
 356                                       int prot);
 357 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 358
 359 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 360                               unsigned long iova, int flags);
 361
 362 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 363 {
 364         if (domain->ops->flush_iotlb_all)
 365                 domain->ops->flush_iotlb_all(domain);
 366 }
 367
 368 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 369                                        unsigned long iova, size_t size)
 370 {
 371         if (domain->ops->iotlb_range_add)
 372                 domain->ops->iotlb_range_add(domain, iova, size);
 373 }
 374
 375 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 376 {
 377         if (domain->ops->iotlb_sync)
 378                 domain->ops->iotlb_sync(domain);
 379 }
 380
 381 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 382                                   unsigned long iova, struct scatterlist *sg,
 383                                   unsigned int nents, int prot)
 384 {
 385         return domain->ops->map_sg(domain, iova, sg, nents, prot);
 386 }
 387
 388 /* PCI device grouping function */
 389 extern struct iommu_group *pci_device_group(struct device *dev);
 390 /* Generic device grouping function */
 391 extern struct iommu_group *generic_device_group(struct device *dev);
 392
 393 /**
 394  * struct iommu_fwspec - per-device IOMMU instance data
 395  * @ops: ops for this device's IOMMU
 396  * @iommu_fwnode: firmware handle for this device's IOMMU
 397  * @iommu_priv: IOMMU driver private data for this device
 398  * @num_ids: number of associated device IDs
 399  * @ids: IDs which this device may present to the IOMMU
 400  */
 401 struct iommu_fwspec {
 402         const struct iommu_ops  *ops;
 403         struct fwnode_handle    *iommu_fwnode;
 404         void                    *iommu_priv;
 405         unsigned int            num_ids;
 406         u32                     ids[1];
 407 };
 408
 409 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 410                       const struct iommu_ops *ops);
 411 void iommu_fwspec_free(struct device *dev);
 412 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 413 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 414
 415 #else /* CONFIG_IOMMU_API */
 416
 417 struct iommu_ops {};
 418 struct iommu_group {};
 419 struct iommu_fwspec {};
 420 struct iommu_device {};
 421
 422 static inline bool iommu_present(struct bus_type *bus)
 423 {
 424         return false;
 425 }
 426
 427 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 428 {
 429         return false;
 430 }
 431
 432 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 433 {
 434         return NULL;
 435 }
 436
 437 static inline struct iommu_group *iommu_group_get_by_id(int id)
 438 {
 439         return NULL;
 440 }
 441
 442 static inline void iommu_domain_free(struct iommu_domain *domain)
 443 {
 444 }
 445
 446 static inline int iommu_attach_device(struct iommu_domain *domain,
 447                                       struct device *dev)
 448 {
 449         return -ENODEV;
 450 }
 451
 452 static inline void iommu_detach_device(struct iommu_domain *domain,
 453                                        struct device *dev)
 454 {
 455 }
 456
 457 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 458 {
 459         return NULL;
 460 }
 461
 462 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 463                             phys_addr_t paddr, size_t size, int prot)
 464 {
 465         return -ENODEV;
 466 }
 467
 468 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 469                               size_t size)
 470 {
 471         return -ENODEV;
 472 }
 473
 474 static inline int iommu_unmap_fast(struct iommu_domain *domain, unsigned long iova,
 475                                    int gfp_order)
 476 {
 477         return -ENODEV;
 478 }
 479
 480 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 481                                   unsigned long iova, struct scatterlist *sg,
 482                                   unsigned int nents, int prot)
 483 {
 484         return -ENODEV;
 485 }
 486
 487 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 488 {
 489 }
 490
 491 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 492                                        unsigned long iova, size_t size)
 493 {
 494 }
 495
 496 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 497 {
 498 }
 499
 500 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 501                                              u32 wnd_nr, phys_addr_t paddr,
 502                                              u64 size, int prot)
 503 {
 504         return -ENODEV;
 505 }
 506
 507 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 508                                                u32 wnd_nr)
 509 {
 510 }
 511
 512 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 513 {
 514         return 0;
 515 }
 516
 517 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 518                                 iommu_fault_handler_t handler, void *token)
 519 {
 520 }
 521
 522 static inline void iommu_get_resv_regions(struct device *dev,
 523                                         struct list_head *list)
 524 {
 525 }
 526
 527 static inline void iommu_put_resv_regions(struct device *dev,
 528                                         struct list_head *list)
 529 {
 530 }
 531
 532 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 533                                                struct list_head *head)
 534 {
 535         return -ENODEV;
 536 }
 537
 538 static inline int iommu_request_dm_for_dev(struct device *dev)
 539 {
 540         return -ENODEV;
 541 }
 542
 543 static inline int iommu_attach_group(struct iommu_domain *domain,
 544                                      struct iommu_group *group)
 545 {
 546         return -ENODEV;
 547 }
 548
 549 static inline void iommu_detach_group(struct iommu_domain *domain,
 550                                       struct iommu_group *group)
 551 {
 552 }
 553
 554 static inline struct iommu_group *iommu_group_alloc(void)
 555 {
 556         return ERR_PTR(-ENODEV);
 557 }
 558
 559 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 560 {
 561         return NULL;
 562 }
 563
 564 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 565                                              void *iommu_data,
 566                                              void (*release)(void *iommu_data))
 567 {
 568 }
 569
 570 static inline int iommu_group_set_name(struct iommu_group *group,
 571                                        const char *name)
 572 {
 573         return -ENODEV;
 574 }
 575
 576 static inline int iommu_group_add_device(struct iommu_group *group,
 577                                          struct device *dev)
 578 {
 579         return -ENODEV;
 580 }
 581
 582 static inline void iommu_group_remove_device(struct device *dev)
 583 {
 584 }
 585
 586 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 587                                            void *data,
 588                                            int (*fn)(struct device *, void *))
 589 {
 590         return -ENODEV;
 591 }
 592
 593 static inline struct iommu_group *iommu_group_get(struct device *dev)
 594 {
 595         return NULL;
 596 }
 597
 598 static inline void iommu_group_put(struct iommu_group *group)
 599 {
 600 }
 601
 602 static inline int iommu_group_register_notifier(struct iommu_group *group,
 603                                                 struct notifier_block *nb)
 604 {
 605         return -ENODEV;
 606 }
 607
 608 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 609                                                   struct notifier_block *nb)
 610 {
 611         return 0;
 612 }
 613
 614 static inline int iommu_group_id(struct iommu_group *group)
 615 {
 616         return -ENODEV;
 617 }
 618
 619 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 620                                         enum iommu_attr attr, void *data)
 621 {
 622         return -EINVAL;
 623 }
 624
 625 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 626                                         enum iommu_attr attr, void *data)
 627 {
 628         return -EINVAL;
 629 }
 630
 631 static inline int  iommu_device_register(struct iommu_device *iommu)
 632 {
 633         return -ENODEV;
 634 }
 635
 636 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 637                                         const struct iommu_ops *ops)
 638 {
 639 }
 640
 641 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 642                                            struct fwnode_handle *fwnode)
 643 {
 644 }
 645
 646 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 647 {
 648         return NULL;
 649 }
 650
 651 static inline void iommu_device_unregister(struct iommu_device *iommu)
 652 {
 653 }
 654
 655 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
 656                                           struct device *parent,
 657                                           const struct attribute_group **groups,
 658                                           const char *fmt, ...)
 659 {
 660         return -ENODEV;
 661 }
 662
 663 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
 664 {
 665 }
 666
 667 static inline int iommu_device_link(struct device *dev, struct device *link)
 668 {
 669         return -EINVAL;
 670 }
 671
 672 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 673 {
 674 }
 675
 676 static inline int iommu_fwspec_init(struct device *dev,
 677                                     struct fwnode_handle *iommu_fwnode,
 678                                     const struct iommu_ops *ops)
 679 {
 680         return -ENODEV;
 681 }
 682
 683 static inline void iommu_fwspec_free(struct device *dev)
 684 {
 685 }
 686
 687 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 688                                        int num_ids)
 689 {
 690         return -ENODEV;
 691 }
 692
 693 static inline
 694 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 695 {
 696         return NULL;
 697 }
 698
 699 #endif /* CONFIG_IOMMU_API */
 700
 701 #endif /* __LINUX_IOMMU_H */