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 struct iommu_sva;
  52
  53 /* iommu fault flags */
  54 #define IOMMU_FAULT_READ        0x0
  55 #define IOMMU_FAULT_WRITE       0x1
  56
  57 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  58                         struct device *, unsigned long, int, void *);
  59 typedef int (*iommu_mm_exit_handler_t)(struct device *dev, struct iommu_sva *,
  60                                        void *);
  61
  62 struct iommu_domain_geometry {
  63         dma_addr_t aperture_start; /* First address that can be mapped    */
  64         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  65         bool force_aperture;       /* DMA only allowed in mappable range? */
  66 };
  67
  68 /* Domain feature flags */
  69 #define __IOMMU_DOMAIN_PAGING   (1U << 0)  /* Support for iommu_map/unmap */
  70 #define __IOMMU_DOMAIN_DMA_API  (1U << 1)  /* Domain for use in DMA-API
  71                                               implementation              */
  72 #define __IOMMU_DOMAIN_PT       (1U << 2)  /* Domain is identity mapped   */
  73
  74 /*
  75  * This are the possible domain-types
  76  *
  77  *      IOMMU_DOMAIN_BLOCKED    - All DMA is blocked, can be used to isolate
  78  *                                devices
  79  *      IOMMU_DOMAIN_IDENTITY   - DMA addresses are system physical addresses
  80  *      IOMMU_DOMAIN_UNMANAGED  - DMA mappings managed by IOMMU-API user, used
  81  *                                for VMs
  82  *      IOMMU_DOMAIN_DMA        - Internally used for DMA-API implementations.
  83  *                                This flag allows IOMMU drivers to implement
  84  *                                certain optimizations for these domains
  85  */
  86 #define IOMMU_DOMAIN_BLOCKED    (0U)
  87 #define IOMMU_DOMAIN_IDENTITY   (__IOMMU_DOMAIN_PT)
  88 #define IOMMU_DOMAIN_UNMANAGED  (__IOMMU_DOMAIN_PAGING)
  89 #define IOMMU_DOMAIN_DMA        (__IOMMU_DOMAIN_PAGING |        \
  90                                  __IOMMU_DOMAIN_DMA_API)
  91
  92 struct iommu_domain {
  93         unsigned type;
  94         const struct iommu_ops *ops;
  95         unsigned long pgsize_bitmap;    /* Bitmap of page sizes in use */
  96         iommu_fault_handler_t handler;
  97         void *handler_token;
  98         struct iommu_domain_geometry geometry;
  99         void *iova_cookie;
 100 };
 101
 102 enum iommu_cap {
 103         IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
 104                                            transactions */
 105         IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
 106         IOMMU_CAP_NOEXEC,               /* IOMMU_NOEXEC flag */
 107 };
 108
 109 /*
 110  * Following constraints are specifc to FSL_PAMUV1:
 111  *  -aperture must be power of 2, and naturally aligned
 112  *  -number of windows must be power of 2, and address space size
 113  *   of each window is determined by aperture size / # of windows
 114  *  -the actual size of the mapped region of a window must be power
 115  *   of 2 starting with 4KB and physical address must be naturally
 116  *   aligned.
 117  * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
 118  * The caller can invoke iommu_domain_get_attr to check if the underlying
 119  * iommu implementation supports these constraints.
 120  */
 121
 122 enum iommu_attr {
 123         DOMAIN_ATTR_GEOMETRY,
 124         DOMAIN_ATTR_PAGING,
 125         DOMAIN_ATTR_WINDOWS,
 126         DOMAIN_ATTR_FSL_PAMU_STASH,
 127         DOMAIN_ATTR_FSL_PAMU_ENABLE,
 128         DOMAIN_ATTR_FSL_PAMUV1,
 129         DOMAIN_ATTR_NESTING,    /* two stages of translation */
 130         DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
 131         DOMAIN_ATTR_MAX,
 132 };
 133
 134 /* These are the possible reserved region types */
 135 enum iommu_resv_type {
 136         /* Memory regions which must be mapped 1:1 at all times */
 137         IOMMU_RESV_DIRECT,
 138         /* Arbitrary "never map this or give it to a device" address ranges */
 139         IOMMU_RESV_RESERVED,
 140         /* Hardware MSI region (untranslated) */
 141         IOMMU_RESV_MSI,
 142         /* Software-managed MSI translation window */
 143         IOMMU_RESV_SW_MSI,
 144 };
 145
 146 /**
 147  * struct iommu_resv_region - descriptor for a reserved memory region
 148  * @list: Linked list pointers
 149  * @start: System physical start address of the region
 150  * @length: Length of the region in bytes
 151  * @prot: IOMMU Protection flags (READ/WRITE/...)
 152  * @type: Type of the reserved region
 153  */
 154 struct iommu_resv_region {
 155         struct list_head        list;
 156         phys_addr_t             start;
 157         size_t                  length;
 158         int                     prot;
 159         enum iommu_resv_type    type;
 160 };
 161
 162 /* Per device IOMMU features */
 163 enum iommu_dev_features {
 164         IOMMU_DEV_FEAT_AUX,     /* Aux-domain feature */
 165         IOMMU_DEV_FEAT_SVA,     /* Shared Virtual Addresses */
 166 };
 167
 168 #define IOMMU_PASID_INVALID     (-1U)
 169
 170 /**
 171  * struct iommu_sva_ops - device driver callbacks for an SVA context
 172  *
 173  * @mm_exit: called when the mm is about to be torn down by exit_mmap. After
 174  *           @mm_exit returns, the device must not issue any more transaction
 175  *           with the PASID given as argument.
 176  *
 177  *           The @mm_exit handler is allowed to sleep. Be careful about the
 178  *           locks taken in @mm_exit, because they might lead to deadlocks if
 179  *           they are also held when dropping references to the mm. Consider the
 180  *           following call chain:
 181  *           mutex_lock(A); mmput(mm) -> exit_mm() -> @mm_exit() -> mutex_lock(A)
 182  *           Using mmput_async() prevents this scenario.
 183  *
 184  */
 185 struct iommu_sva_ops {
 186         iommu_mm_exit_handler_t mm_exit;
 187 };
 188
 189 #ifdef CONFIG_IOMMU_API
 190
 191 /**
 192  * struct iommu_ops - iommu ops and capabilities
 193  * @capable: check capability
 194  * @domain_alloc: allocate iommu domain
 195  * @domain_free: free iommu domain
 196  * @attach_dev: attach device to an iommu domain
 197  * @detach_dev: detach device from an iommu domain
 198  * @map: map a physically contiguous memory region to an iommu domain
 199  * @unmap: unmap a physically contiguous memory region from an iommu domain
 200  * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
 201  * @iotlb_range_add: Add a given iova range to the flush queue for this domain
 202  * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
 203  * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
 204  *            queue
 205  * @iova_to_phys: translate iova to physical address
 206  * @add_device: add device to iommu grouping
 207  * @remove_device: remove device from iommu grouping
 208  * @device_group: find iommu group for a particular device
 209  * @domain_get_attr: Query domain attributes
 210  * @domain_set_attr: Change domain attributes
 211  * @get_resv_regions: Request list of reserved regions for a device
 212  * @put_resv_regions: Free list of reserved regions for a device
 213  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 214  * @domain_window_enable: Configure and enable a particular window for a domain
 215  * @domain_window_disable: Disable a particular window for a domain
 216  * @of_xlate: add OF master IDs to iommu grouping
 217  * @is_attach_deferred: Check if domain attach should be deferred from iommu
 218  *                      driver init to device driver init (default no)
 219  * @dev_has/enable/disable_feat: per device entries to check/enable/disable
 220  *                               iommu specific features.
 221  * @dev_feat_enabled: check enabled feature
 222  * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
 223  * @aux_get_pasid: get the pasid given an aux-domain
 224  * @sva_bind: Bind process address space to device
 225  * @sva_unbind: Unbind process address space from device
 226  * @sva_get_pasid: Get PASID associated to a SVA handle
 227  * @pgsize_bitmap: bitmap of all possible supported page sizes
 228  */
 229 struct iommu_ops {
 230         bool (*capable)(enum iommu_cap);
 231
 232         /* Domain allocation and freeing by the iommu driver */
 233         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 234         void (*domain_free)(struct iommu_domain *);
 235
 236         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 237         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 238         int (*map)(struct iommu_domain *domain, unsigned long iova,
 239                    phys_addr_t paddr, size_t size, int prot);
 240         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 241                      size_t size);
 242         void (*flush_iotlb_all)(struct iommu_domain *domain);
 243         void (*iotlb_range_add)(struct iommu_domain *domain,
 244                                 unsigned long iova, size_t size);
 245         void (*iotlb_sync_map)(struct iommu_domain *domain);
 246         void (*iotlb_sync)(struct iommu_domain *domain);
 247         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 248         int (*add_device)(struct device *dev);
 249         void (*remove_device)(struct device *dev);
 250         struct iommu_group *(*device_group)(struct device *dev);
 251         int (*domain_get_attr)(struct iommu_domain *domain,
 252                                enum iommu_attr attr, void *data);
 253         int (*domain_set_attr)(struct iommu_domain *domain,
 254                                enum iommu_attr attr, void *data);
 255
 256         /* Request/Free a list of reserved regions for a device */
 257         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 258         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 259         void (*apply_resv_region)(struct device *dev,
 260                                   struct iommu_domain *domain,
 261                                   struct iommu_resv_region *region);
 262
 263         /* Window handling functions */
 264         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 265                                     phys_addr_t paddr, u64 size, int prot);
 266         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 267
 268         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 269         bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 270
 271         /* Per device IOMMU features */
 272         bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
 273         bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
 274         int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
 275         int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
 276
 277         /* Aux-domain specific attach/detach entries */
 278         int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
 279         void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
 280         int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);
 281
 282         struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
 283                                       void *drvdata);
 284         void (*sva_unbind)(struct iommu_sva *handle);
 285         int (*sva_get_pasid)(struct iommu_sva *handle);
 286
 287         unsigned long pgsize_bitmap;
 288 };
 289
 290 /**
 291  * struct iommu_device - IOMMU core representation of one IOMMU hardware
 292  *                       instance
 293  * @list: Used by the iommu-core to keep a list of registered iommus
 294  * @ops: iommu-ops for talking to this iommu
 295  * @dev: struct device for sysfs handling
 296  */
 297 struct iommu_device {
 298         struct list_head list;
 299         const struct iommu_ops *ops;
 300         struct fwnode_handle *fwnode;
 301         struct device *dev;
 302 };
 303
 304 int  iommu_device_register(struct iommu_device *iommu);
 305 void iommu_device_unregister(struct iommu_device *iommu);
 306 int  iommu_device_sysfs_add(struct iommu_device *iommu,
 307                             struct device *parent,
 308                             const struct attribute_group **groups,
 309                             const char *fmt, ...) __printf(4, 5);
 310 void iommu_device_sysfs_remove(struct iommu_device *iommu);
 311 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
 312 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
 313
 314 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 315                                         const struct iommu_ops *ops)
 316 {
 317         iommu->ops = ops;
 318 }
 319
 320 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 321                                            struct fwnode_handle *fwnode)
 322 {
 323         iommu->fwnode = fwnode;
 324 }
 325
 326 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 327 {
 328         return (struct iommu_device *)dev_get_drvdata(dev);
 329 }
 330
 331 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 332 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 333 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 334 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 335 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 336 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 337
 338 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 339 extern bool iommu_present(struct bus_type *bus);
 340 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 341 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 342 extern struct iommu_group *iommu_group_get_by_id(int id);
 343 extern void iommu_domain_free(struct iommu_domain *domain);
 344 extern int iommu_attach_device(struct iommu_domain *domain,
 345                                struct device *dev);
 346 extern void iommu_detach_device(struct iommu_domain *domain,
 347                                 struct device *dev);
 348 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 349 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
 350 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 351                      phys_addr_t paddr, size_t size, int prot);
 352 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 353                           size_t size);
 354 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
 355                                unsigned long iova, size_t size);
 356 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 357                            struct scatterlist *sg,unsigned int nents, int prot);
 358 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 359 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 360                         iommu_fault_handler_t handler, void *token);
 361
 362 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 363 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 364 extern int iommu_request_dm_for_dev(struct device *dev);
 365 extern struct iommu_resv_region *
 366 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 367                         enum iommu_resv_type type);
 368 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 369                                         struct list_head *head);
 370
 371 extern int iommu_attach_group(struct iommu_domain *domain,
 372                               struct iommu_group *group);
 373 extern void iommu_detach_group(struct iommu_domain *domain,
 374                                struct iommu_group *group);
 375 extern struct iommu_group *iommu_group_alloc(void);
 376 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 377 extern void iommu_group_set_iommudata(struct iommu_group *group,
 378                                       void *iommu_data,
 379                                       void (*release)(void *iommu_data));
 380 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 381 extern int iommu_group_add_device(struct iommu_group *group,
 382                                   struct device *dev);
 383 extern void iommu_group_remove_device(struct device *dev);
 384 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 385                                     int (*fn)(struct device *, void *));
 386 extern struct iommu_group *iommu_group_get(struct device *dev);
 387 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 388 extern void iommu_group_put(struct iommu_group *group);
 389 extern int iommu_group_register_notifier(struct iommu_group *group,
 390                                          struct notifier_block *nb);
 391 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 392                                            struct notifier_block *nb);
 393 extern int iommu_group_id(struct iommu_group *group);
 394 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 395 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 396
 397 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 398                                  void *data);
 399 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 400                                  void *data);
 401
 402 /* Window handling function prototypes */
 403 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 404                                       phys_addr_t offset, u64 size,
 405                                       int prot);
 406 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 407
 408 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 409                               unsigned long iova, int flags);
 410
 411 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 412 {
 413         if (domain->ops->flush_iotlb_all)
 414                 domain->ops->flush_iotlb_all(domain);
 415 }
 416
 417 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 418                                        unsigned long iova, size_t size)
 419 {
 420         if (domain->ops->iotlb_range_add)
 421                 domain->ops->iotlb_range_add(domain, iova, size);
 422 }
 423
 424 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 425 {
 426         if (domain->ops->iotlb_sync)
 427                 domain->ops->iotlb_sync(domain);
 428 }
 429
 430 /* PCI device grouping function */
 431 extern struct iommu_group *pci_device_group(struct device *dev);
 432 /* Generic device grouping function */
 433 extern struct iommu_group *generic_device_group(struct device *dev);
 434 /* FSL-MC device grouping function */
 435 struct iommu_group *fsl_mc_device_group(struct device *dev);
 436
 437 /**
 438  * struct iommu_fwspec - per-device IOMMU instance data
 439  * @ops: ops for this device's IOMMU
 440  * @iommu_fwnode: firmware handle for this device's IOMMU
 441  * @iommu_priv: IOMMU driver private data for this device
 442  * @num_ids: number of associated device IDs
 443  * @ids: IDs which this device may present to the IOMMU
 444  */
 445 struct iommu_fwspec {
 446         const struct iommu_ops  *ops;
 447         struct fwnode_handle    *iommu_fwnode;
 448         void                    *iommu_priv;
 449         u32                     flags;
 450         unsigned int            num_ids;
 451         u32                     ids[1];
 452 };
 453
 454 /* ATS is supported */
 455 #define IOMMU_FWSPEC_PCI_RC_ATS                 (1 << 0)
 456
 457 /**
 458  * struct iommu_sva - handle to a device-mm bond
 459  */
 460 struct iommu_sva {
 461         struct device                   *dev;
 462         const struct iommu_sva_ops      *ops;
 463 };
 464
 465 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 466                       const struct iommu_ops *ops);
 467 void iommu_fwspec_free(struct device *dev);
 468 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 469 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 470
 471 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
 472 {
 473         return dev->iommu_fwspec;
 474 }
 475
 476 static inline void dev_iommu_fwspec_set(struct device *dev,
 477                                         struct iommu_fwspec *fwspec)
 478 {
 479         dev->iommu_fwspec = fwspec;
 480 }
 481
 482 int iommu_probe_device(struct device *dev);
 483 void iommu_release_device(struct device *dev);
 484
 485 bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
 486 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
 487 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
 488 bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
 489 int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
 490 void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
 491 int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);
 492
 493 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
 494                                         struct mm_struct *mm,
 495                                         void *drvdata);
 496 void iommu_sva_unbind_device(struct iommu_sva *handle);
 497 int iommu_sva_set_ops(struct iommu_sva *handle,
 498                       const struct iommu_sva_ops *ops);
 499 int iommu_sva_get_pasid(struct iommu_sva *handle);
 500
 501 #else /* CONFIG_IOMMU_API */
 502
 503 struct iommu_ops {};
 504 struct iommu_group {};
 505 struct iommu_fwspec {};
 506 struct iommu_device {};
 507
 508 static inline bool iommu_present(struct bus_type *bus)
 509 {
 510         return false;
 511 }
 512
 513 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 514 {
 515         return false;
 516 }
 517
 518 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 519 {
 520         return NULL;
 521 }
 522
 523 static inline struct iommu_group *iommu_group_get_by_id(int id)
 524 {
 525         return NULL;
 526 }
 527
 528 static inline void iommu_domain_free(struct iommu_domain *domain)
 529 {
 530 }
 531
 532 static inline int iommu_attach_device(struct iommu_domain *domain,
 533                                       struct device *dev)
 534 {
 535         return -ENODEV;
 536 }
 537
 538 static inline void iommu_detach_device(struct iommu_domain *domain,
 539                                        struct device *dev)
 540 {
 541 }
 542
 543 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 544 {
 545         return NULL;
 546 }
 547
 548 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 549                             phys_addr_t paddr, size_t size, int prot)
 550 {
 551         return -ENODEV;
 552 }
 553
 554 static inline size_t iommu_unmap(struct iommu_domain *domain,
 555                                  unsigned long iova, size_t size)
 556 {
 557         return 0;
 558 }
 559
 560 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
 561                                       unsigned long iova, int gfp_order)
 562 {
 563         return 0;
 564 }
 565
 566 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 567                                   unsigned long iova, struct scatterlist *sg,
 568                                   unsigned int nents, int prot)
 569 {
 570         return 0;
 571 }
 572
 573 static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
 574 {
 575 }
 576
 577 static inline void iommu_tlb_range_add(struct iommu_domain *domain,
 578                                        unsigned long iova, size_t size)
 579 {
 580 }
 581
 582 static inline void iommu_tlb_sync(struct iommu_domain *domain)
 583 {
 584 }
 585
 586 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 587                                              u32 wnd_nr, phys_addr_t paddr,
 588                                              u64 size, int prot)
 589 {
 590         return -ENODEV;
 591 }
 592
 593 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 594                                                u32 wnd_nr)
 595 {
 596 }
 597
 598 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 599 {
 600         return 0;
 601 }
 602
 603 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 604                                 iommu_fault_handler_t handler, void *token)
 605 {
 606 }
 607
 608 static inline void iommu_get_resv_regions(struct device *dev,
 609                                         struct list_head *list)
 610 {
 611 }
 612
 613 static inline void iommu_put_resv_regions(struct device *dev,
 614                                         struct list_head *list)
 615 {
 616 }
 617
 618 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 619                                                struct list_head *head)
 620 {
 621         return -ENODEV;
 622 }
 623
 624 static inline int iommu_request_dm_for_dev(struct device *dev)
 625 {
 626         return -ENODEV;
 627 }
 628
 629 static inline int iommu_attach_group(struct iommu_domain *domain,
 630                                      struct iommu_group *group)
 631 {
 632         return -ENODEV;
 633 }
 634
 635 static inline void iommu_detach_group(struct iommu_domain *domain,
 636                                       struct iommu_group *group)
 637 {
 638 }
 639
 640 static inline struct iommu_group *iommu_group_alloc(void)
 641 {
 642         return ERR_PTR(-ENODEV);
 643 }
 644
 645 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 646 {
 647         return NULL;
 648 }
 649
 650 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 651                                              void *iommu_data,
 652                                              void (*release)(void *iommu_data))
 653 {
 654 }
 655
 656 static inline int iommu_group_set_name(struct iommu_group *group,
 657                                        const char *name)
 658 {
 659         return -ENODEV;
 660 }
 661
 662 static inline int iommu_group_add_device(struct iommu_group *group,
 663                                          struct device *dev)
 664 {
 665         return -ENODEV;
 666 }
 667
 668 static inline void iommu_group_remove_device(struct device *dev)
 669 {
 670 }
 671
 672 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 673                                            void *data,
 674                                            int (*fn)(struct device *, void *))
 675 {
 676         return -ENODEV;
 677 }
 678
 679 static inline struct iommu_group *iommu_group_get(struct device *dev)
 680 {
 681         return NULL;
 682 }
 683
 684 static inline void iommu_group_put(struct iommu_group *group)
 685 {
 686 }
 687
 688 static inline int iommu_group_register_notifier(struct iommu_group *group,
 689                                                 struct notifier_block *nb)
 690 {
 691         return -ENODEV;
 692 }
 693
 694 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 695                                                   struct notifier_block *nb)
 696 {
 697         return 0;
 698 }
 699
 700 static inline int iommu_group_id(struct iommu_group *group)
 701 {
 702         return -ENODEV;
 703 }
 704
 705 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 706                                         enum iommu_attr attr, void *data)
 707 {
 708         return -EINVAL;
 709 }
 710
 711 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 712                                         enum iommu_attr attr, void *data)
 713 {
 714         return -EINVAL;
 715 }
 716
 717 static inline int  iommu_device_register(struct iommu_device *iommu)
 718 {
 719         return -ENODEV;
 720 }
 721
 722 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 723                                         const struct iommu_ops *ops)
 724 {
 725 }
 726
 727 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 728                                            struct fwnode_handle *fwnode)
 729 {
 730 }
 731
 732 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 733 {
 734         return NULL;
 735 }
 736
 737 static inline void iommu_device_unregister(struct iommu_device *iommu)
 738 {
 739 }
 740
 741 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
 742                                           struct device *parent,
 743                                           const struct attribute_group **groups,
 744                                           const char *fmt, ...)
 745 {
 746         return -ENODEV;
 747 }
 748
 749 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
 750 {
 751 }
 752
 753 static inline int iommu_device_link(struct device *dev, struct device *link)
 754 {
 755         return -EINVAL;
 756 }
 757
 758 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 759 {
 760 }
 761
 762 static inline int iommu_fwspec_init(struct device *dev,
 763                                     struct fwnode_handle *iommu_fwnode,
 764                                     const struct iommu_ops *ops)
 765 {
 766         return -ENODEV;
 767 }
 768
 769 static inline void iommu_fwspec_free(struct device *dev)
 770 {
 771 }
 772
 773 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 774                                        int num_ids)
 775 {
 776         return -ENODEV;
 777 }
 778
 779 static inline
 780 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 781 {
 782         return NULL;
 783 }
 784
 785 static inline bool
 786 iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
 787 {
 788         return false;
 789 }
 790
 791 static inline bool
 792 iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
 793 {
 794         return false;
 795 }
 796
 797 static inline int
 798 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
 799 {
 800         return -ENODEV;
 801 }
 802
 803 static inline int
 804 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
 805 {
 806         return -ENODEV;
 807 }
 808
 809 static inline int
 810 iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
 811 {
 812         return -ENODEV;
 813 }
 814
 815 static inline void
 816 iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
 817 {
 818 }
 819
 820 static inline int
 821 iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
 822 {
 823         return -ENODEV;
 824 }
 825
 826 static inline struct iommu_sva *
 827 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
 828 {
 829         return NULL;
 830 }
 831
 832 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
 833 {
 834 }
 835
 836 static inline int iommu_sva_set_ops(struct iommu_sva *handle,
 837                                     const struct iommu_sva_ops *ops)
 838 {
 839         return -EINVAL;
 840 }
 841
 842 static inline int iommu_sva_get_pasid(struct iommu_sva *handle)
 843 {
 844         return IOMMU_PASID_INVALID;
 845 }
 846
 847 #endif /* CONFIG_IOMMU_API */
 848
 849 #ifdef CONFIG_IOMMU_DEBUGFS
 850 extern  struct dentry *iommu_debugfs_dir;
 851 void iommu_debugfs_setup(void);
 852 #else
 853 static inline void iommu_debugfs_setup(void) {}
 854 #endif
 855
 856 #endif /* __LINUX_IOMMU_H */