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_DMA_USE_FLUSH_QUEUE,
 128         DOMAIN_ATTR_MAX,
 129 };
 130
 131 /* These are the possible reserved region types */
 132 enum iommu_resv_type {
 133         /* Memory regions which must be mapped 1:1 at all times */
 134         IOMMU_RESV_DIRECT,
 135         /* Arbitrary "never map this or give it to a device" address ranges */
 136         IOMMU_RESV_RESERVED,
 137         /* Hardware MSI region (untranslated) */
 138         IOMMU_RESV_MSI,
 139         /* Software-managed MSI translation window */
 140         IOMMU_RESV_SW_MSI,
 141 };
 142
 143 /**
 144  * struct iommu_resv_region - descriptor for a reserved memory region
 145  * @list: Linked list pointers
 146  * @start: System physical start address of the region
 147  * @length: Length of the region in bytes
 148  * @prot: IOMMU Protection flags (READ/WRITE/...)
 149  * @type: Type of the reserved region
 150  */
 151 struct iommu_resv_region {
 152         struct list_head        list;
 153         phys_addr_t             start;
 154         size_t                  length;
 155         int                     prot;
 156         enum iommu_resv_type    type;
 157 };
 158
 159 #ifdef CONFIG_IOMMU_API
 160
 161 /**
 162  * struct iommu_ops - iommu ops and capabilities
 163  * @capable: check capability
 164  * @domain_alloc: allocate iommu domain
 165  * @domain_free: free iommu domain
 166  * @attach_dev: attach device to an iommu domain
 167  * @detach_dev: detach device from an iommu domain
 168  * @map: map a physically contiguous memory region to an iommu domain
 169  * @unmap: unmap a physically contiguous memory region from an iommu domain
 170  * @map_sg: map a scatter-gather list of physically contiguous memory chunks
 171  *          to an iommu domain
 172  * @flush_tlb_all: Synchronously flush all hardware TLBs for this domain
 173  * @tlb_range_add: Add a given iova range to the flush queue for this domain
 174  * @tlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
 175  *            queue
 176  * @iova_to_phys: translate iova to physical address
 177  * @add_device: add device to iommu grouping
 178  * @remove_device: remove device from iommu grouping
 179  * @device_group: find iommu group for a particular device
 180  * @domain_get_attr: Query domain attributes
 181  * @domain_set_attr: Change domain attributes
 182  * @get_resv_regions: Request list of reserved regions for a device
 183  * @put_resv_regions: Free list of reserved regions for a device
 184  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 185  * @domain_window_enable: Configure and enable a particular window for a domain
 186  * @domain_window_disable: Disable a particular window for a domain
 187  * @domain_set_windows: Set the number of windows for a domain
 188  * @domain_get_windows: Return the number of windows for a domain
 189  * @of_xlate: add OF master IDs to iommu grouping
 190  * @pgsize_bitmap: bitmap of all possible supported page sizes
 191  */
 192 struct iommu_ops {
 193         bool (*capable)(enum iommu_cap);
 194
 195         /* Domain allocation and freeing by the iommu driver */
 196         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 197         void (*domain_free)(struct iommu_domain *);
 198
 199         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 200         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 201         int (*map)(struct iommu_domain *domain, unsigned long iova,
 202                    phys_addr_t paddr, size_t size, int prot);
 203         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 204                      size_t size);
 205         size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
 206                          struct scatterlist *sg, unsigned int nents, int prot);
 207         void (*flush_iotlb_all)(struct iommu_domain *domain);
 208         void (*iotlb_range_add)(struct iommu_domain *domain,
 209                                 unsigned long iova, size_t size);
 210         void (*iotlb_sync)(struct iommu_domain *domain);
 211         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 212         int (*add_device)(struct device *dev);
 213         void (*remove_device)(struct device *dev);
 214         struct iommu_group *(*device_group)(struct device *dev);
 215         int (*domain_get_attr)(struct iommu_domain *domain,
 216                                enum iommu_attr attr, void *data);
 217         int (*domain_set_attr)(struct iommu_domain *domain,
 218                                enum iommu_attr attr, void *data);
 219
 220         /* Request/Free a list of reserved regions for a device */
 221         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 222         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 223         void (*apply_resv_region)(struct device *dev,
 224                                   struct iommu_domain *domain,
 225                                   struct iommu_resv_region *region);
 226
 227         /* Window handling functions */
 228         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 229                                     phys_addr_t paddr, u64 size, int prot);
 230         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 231         /* Set the number of windows per domain */
 232         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 233         /* Get the number of windows per domain */
 234         u32 (*domain_get_windows)(struct iommu_domain *domain);
 235
 236         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 237         bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 238
 239         unsigned long pgsize_bitmap;
 240 };
 241
 242 /**
 243  * struct iommu_device - IOMMU core representation of one IOMMU hardware
 244  *                       instance
 245  * @list: Used by the iommu-core to keep a list of registered iommus
 246  * @ops: iommu-ops for talking to this iommu
 247  * @dev: struct device for sysfs handling
 248  */
 249 struct iommu_device {
 250         struct list_head list;
 251         const struct iommu_ops *ops;
 252         struct fwnode_handle *fwnode;
 253         struct device *dev;
 254 };
 255
 256 int  iommu_device_register(struct iommu_device *iommu);
 257 void iommu_device_unregister(struct iommu_device *iommu);
 258 int  iommu_device_sysfs_add(struct iommu_device *iommu,
 259                             struct device *parent,
 260                             const struct attribute_group **groups,
 261                             const char *fmt, ...) __printf(4, 5);
 262 void iommu_device_sysfs_remove(struct iommu_device *iommu);
 263 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
 264 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
 265
 266 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 267                                         const struct iommu_ops *ops)
 268 {
 269         iommu->ops = ops;
 270 }
 271
 272 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 273                                            struct fwnode_handle *fwnode)
 274 {
 275         iommu->fwnode = fwnode;
 276 }
 277
 278 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 279 {
 280         return (struct iommu_device *)dev_get_drvdata(dev);
 281 }
 282
 283 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 284 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 285 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 286 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 287 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 288 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 289
 290 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 291 extern bool iommu_present(struct bus_type *bus);
 292 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 293 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 294 extern struct iommu_group *iommu_group_get_by_id(int id);
 295 extern void iommu_domain_free(struct iommu_domain *domain);
 296 extern int iommu_attach_device(struct iommu_domain *domain,
 297                                struct device *dev);
 298 extern void iommu_detach_device(struct iommu_domain *domain,
 299                                 struct device *dev);
 300 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 301 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 302                      phys_addr_t paddr, size_t size, int prot);
 303 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 304                           size_t size);
 305 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
 306                                unsigned long iova, size_t size);
 307 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 308                                 struct scatterlist *sg,unsigned int nents,
 309                                 int prot);
 310 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 311 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 312                         iommu_fault_handler_t handler, void *token);
 313
 314 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 315 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 316 extern int iommu_request_dm_for_dev(struct device *dev);
 317 extern struct iommu_resv_region *
 318 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 319                         enum iommu_resv_type type);
 320 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 321                                         struct list_head *head);
 322
 323 extern int iommu_attach_group(struct iommu_domain *domain,
 324                               struct iommu_group *group);
 325 extern void iommu_detach_group(struct iommu_domain *domain,
 326                                struct iommu_group *group);
 327 extern struct iommu_group *iommu_group_alloc(void);
 328 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 329 extern void iommu_group_set_iommudata(struct iommu_group *group,
 330                                       void *iommu_data,
 331                                       void (*release)(void *iommu_data));
 332 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 333 extern int iommu_group_add_device(struct iommu_group *group,
 334                                   struct device *dev);
 335 extern void iommu_group_remove_device(struct device *dev);
 336 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 337                                     int (*fn)(struct device *, void *));
 338 extern struct iommu_group *iommu_group_get(struct device *dev);
 339 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 340 extern void iommu_group_put(struct iommu_group *group);
 341 extern int iommu_group_register_notifier(struct iommu_group *group,
 342                                          struct notifier_block *nb);
 343 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 344                                            struct notifier_block *nb);
 345 extern int iommu_group_id(struct iommu_group *group);
 346 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 347 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 348
 349 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 350                                  void *data);
 351 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 352                                  void *data);
 353
 354 /* Window handling function prototypes */
 355 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 356                                       phys_addr_t offset, u64 size,
 357                                       int prot);
 358 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 359
 360 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 361                               unsigned long iova, int flags);
 362
 363 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 364 {
 365         if (domain->ops->flush_iotlb_all)
 366                 domain->ops->flush_iotlb_all(domain);
 367 }
 368
 369 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 370                                        unsigned long iova, size_t size)
 371 {
 372         if (domain->ops->iotlb_range_add)
 373                 domain->ops->iotlb_range_add(domain, iova, size);
 374 }
 375
 376 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 377 {
 378         if (domain->ops->iotlb_sync)
 379                 domain->ops->iotlb_sync(domain);
 380 }
 381
 382 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 383                                   unsigned long iova, struct scatterlist *sg,
 384                                   unsigned int nents, int prot)
 385 {
 386         return domain->ops->map_sg(domain, iova, sg, nents, prot);
 387 }
 388
 389 /* PCI device grouping function */
 390 extern struct iommu_group *pci_device_group(struct device *dev);
 391 /* Generic device grouping function */
 392 extern struct iommu_group *generic_device_group(struct device *dev);
 393
 394 /**
 395  * struct iommu_fwspec - per-device IOMMU instance data
 396  * @ops: ops for this device's IOMMU
 397  * @iommu_fwnode: firmware handle for this device's IOMMU
 398  * @iommu_priv: IOMMU driver private data for this device
 399  * @num_ids: number of associated device IDs
 400  * @ids: IDs which this device may present to the IOMMU
 401  */
 402 struct iommu_fwspec {
 403         const struct iommu_ops  *ops;
 404         struct fwnode_handle    *iommu_fwnode;
 405         void                    *iommu_priv;
 406         unsigned int            num_ids;
 407         u32                     ids[1];
 408 };
 409
 410 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 411                       const struct iommu_ops *ops);
 412 void iommu_fwspec_free(struct device *dev);
 413 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 414 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 415
 416 #else /* CONFIG_IOMMU_API */
 417
 418 struct iommu_ops {};
 419 struct iommu_group {};
 420 struct iommu_fwspec {};
 421 struct iommu_device {};
 422
 423 static inline bool iommu_present(struct bus_type *bus)
 424 {
 425         return false;
 426 }
 427
 428 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 429 {
 430         return false;
 431 }
 432
 433 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 434 {
 435         return NULL;
 436 }
 437
 438 static inline struct iommu_group *iommu_group_get_by_id(int id)
 439 {
 440         return NULL;
 441 }
 442
 443 static inline void iommu_domain_free(struct iommu_domain *domain)
 444 {
 445 }
 446
 447 static inline int iommu_attach_device(struct iommu_domain *domain,
 448                                       struct device *dev)
 449 {
 450         return -ENODEV;
 451 }
 452
 453 static inline void iommu_detach_device(struct iommu_domain *domain,
 454                                        struct device *dev)
 455 {
 456 }
 457
 458 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 459 {
 460         return NULL;
 461 }
 462
 463 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 464                             phys_addr_t paddr, size_t size, int prot)
 465 {
 466         return -ENODEV;
 467 }
 468
 469 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 470                               size_t size)
 471 {
 472         return -ENODEV;
 473 }
 474
 475 static inline int iommu_unmap_fast(struct iommu_domain *domain, unsigned long iova,
 476                                    int gfp_order)
 477 {
 478         return -ENODEV;
 479 }
 480
 481 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 482                                   unsigned long iova, struct scatterlist *sg,
 483                                   unsigned int nents, int prot)
 484 {
 485         return -ENODEV;
 486 }
 487
 488 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 489 {
 490 }
 491
 492 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 493                                        unsigned long iova, size_t size)
 494 {
 495 }
 496
 497 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 498 {
 499 }
 500
 501 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 502                                              u32 wnd_nr, phys_addr_t paddr,
 503                                              u64 size, int prot)
 504 {
 505         return -ENODEV;
 506 }
 507
 508 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 509                                                u32 wnd_nr)
 510 {
 511 }
 512
 513 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 514 {
 515         return 0;
 516 }
 517
 518 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 519                                 iommu_fault_handler_t handler, void *token)
 520 {
 521 }
 522
 523 static inline void iommu_get_resv_regions(struct device *dev,
 524                                         struct list_head *list)
 525 {
 526 }
 527
 528 static inline void iommu_put_resv_regions(struct device *dev,
 529                                         struct list_head *list)
 530 {
 531 }
 532
 533 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 534                                                struct list_head *head)
 535 {
 536         return -ENODEV;
 537 }
 538
 539 static inline int iommu_request_dm_for_dev(struct device *dev)
 540 {
 541         return -ENODEV;
 542 }
 543
 544 static inline int iommu_attach_group(struct iommu_domain *domain,
 545                                      struct iommu_group *group)
 546 {
 547         return -ENODEV;
 548 }
 549
 550 static inline void iommu_detach_group(struct iommu_domain *domain,
 551                                       struct iommu_group *group)
 552 {
 553 }
 554
 555 static inline struct iommu_group *iommu_group_alloc(void)
 556 {
 557         return ERR_PTR(-ENODEV);
 558 }
 559
 560 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 561 {
 562         return NULL;
 563 }
 564
 565 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 566                                              void *iommu_data,
 567                                              void (*release)(void *iommu_data))
 568 {
 569 }
 570
 571 static inline int iommu_group_set_name(struct iommu_group *group,
 572                                        const char *name)
 573 {
 574         return -ENODEV;
 575 }
 576
 577 static inline int iommu_group_add_device(struct iommu_group *group,
 578                                          struct device *dev)
 579 {
 580         return -ENODEV;
 581 }
 582
 583 static inline void iommu_group_remove_device(struct device *dev)
 584 {
 585 }
 586
 587 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 588                                            void *data,
 589                                            int (*fn)(struct device *, void *))
 590 {
 591         return -ENODEV;
 592 }
 593
 594 static inline struct iommu_group *iommu_group_get(struct device *dev)
 595 {
 596         return NULL;
 597 }
 598
 599 static inline void iommu_group_put(struct iommu_group *group)
 600 {
 601 }
 602
 603 static inline int iommu_group_register_notifier(struct iommu_group *group,
 604                                                 struct notifier_block *nb)
 605 {
 606         return -ENODEV;
 607 }
 608
 609 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 610                                                   struct notifier_block *nb)
 611 {
 612         return 0;
 613 }
 614
 615 static inline int iommu_group_id(struct iommu_group *group)
 616 {
 617         return -ENODEV;
 618 }
 619
 620 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 621                                         enum iommu_attr attr, void *data)
 622 {
 623         return -EINVAL;
 624 }
 625
 626 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 627                                         enum iommu_attr attr, void *data)
 628 {
 629         return -EINVAL;
 630 }
 631
 632 static inline int  iommu_device_register(struct iommu_device *iommu)
 633 {
 634         return -ENODEV;
 635 }
 636
 637 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 638                                         const struct iommu_ops *ops)
 639 {
 640 }
 641
 642 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 643                                            struct fwnode_handle *fwnode)
 644 {
 645 }
 646
 647 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 648 {
 649         return NULL;
 650 }
 651
 652 static inline void iommu_device_unregister(struct iommu_device *iommu)
 653 {
 654 }
 655
 656 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
 657                                           struct device *parent,
 658                                           const struct attribute_group **groups,
 659                                           const char *fmt, ...)
 660 {
 661         return -ENODEV;
 662 }
 663
 664 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
 665 {
 666 }
 667
 668 static inline int iommu_device_link(struct device *dev, struct device *link)
 669 {
 670         return -EINVAL;
 671 }
 672
 673 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 674 {
 675 }
 676
 677 static inline int iommu_fwspec_init(struct device *dev,
 678                                     struct fwnode_handle *iommu_fwnode,
 679                                     const struct iommu_ops *ops)
 680 {
 681         return -ENODEV;
 682 }
 683
 684 static inline void iommu_fwspec_free(struct device *dev)
 685 {
 686 }
 687
 688 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 689                                        int num_ids)
 690 {
 691         return -ENODEV;
 692 }
 693
 694 static inline
 695 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 696 {
 697         return NULL;
 698 }
 699
 700 #endif /* CONFIG_IOMMU_API */
 701
 702 #endif /* __LINUX_IOMMU_H */