include/linux/iommu.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
   4  * Author: Joerg Roedel <joerg.roedel@amd.com>
   5  */
   6
   7 #ifndef __LINUX_IOMMU_H
   8 #define __LINUX_IOMMU_H
   9
  10 #include <linux/scatterlist.h>
  11 #include <linux/device.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/err.h>
  15 #include <linux/of.h>
  16 #include <linux/ioasid.h>
  17 #include <uapi/linux/iommu.h>
  18
  19 #define IOMMU_READ      (1 << 0)
  20 #define IOMMU_WRITE     (1 << 1)
  21 #define IOMMU_CACHE     (1 << 2) /* DMA cache coherency */
  22 #define IOMMU_NOEXEC    (1 << 3)
  23 #define IOMMU_MMIO      (1 << 4) /* e.g. things like MSI doorbells */
  24 /*
  25  * Where the bus hardware includes a privilege level as part of its access type
  26  * markings, and certain devices are capable of issuing transactions marked as
  27  * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
  28  * given permission flags only apply to accesses at the higher privilege level,
  29  * and that unprivileged transactions should have as little access as possible.
  30  * This would usually imply the same permissions as kernel mappings on the CPU,
  31  * if the IOMMU page table format is equivalent.
  32  */
  33 #define IOMMU_PRIV      (1 << 5)
  34
  35 struct iommu_ops;
  36 struct iommu_group;
  37 struct bus_type;
  38 struct device;
  39 struct iommu_domain;
  40 struct notifier_block;
  41 struct iommu_sva;
  42 struct iommu_fault_event;
  43
  44 /* iommu fault flags */
  45 #define IOMMU_FAULT_READ        0x0
  46 #define IOMMU_FAULT_WRITE       0x1
  47
  48 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  49                         struct device *, unsigned long, int, void *);
  50 typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);
  51
  52 struct iommu_domain_geometry {
  53         dma_addr_t aperture_start; /* First address that can be mapped    */
  54         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  55         bool force_aperture;       /* DMA only allowed in mappable range? */
  56 };
  57
  58 /* Domain feature flags */
  59 #define __IOMMU_DOMAIN_PAGING   (1U << 0)  /* Support for iommu_map/unmap */
  60 #define __IOMMU_DOMAIN_DMA_API  (1U << 1)  /* Domain for use in DMA-API
  61                                               implementation              */
  62 #define __IOMMU_DOMAIN_PT       (1U << 2)  /* Domain is identity mapped   */
  63
  64 /*
  65  * This are the possible domain-types
  66  *
  67  *      IOMMU_DOMAIN_BLOCKED    - All DMA is blocked, can be used to isolate
  68  *                                devices
  69  *      IOMMU_DOMAIN_IDENTITY   - DMA addresses are system physical addresses
  70  *      IOMMU_DOMAIN_UNMANAGED  - DMA mappings managed by IOMMU-API user, used
  71  *                                for VMs
  72  *      IOMMU_DOMAIN_DMA        - Internally used for DMA-API implementations.
  73  *                                This flag allows IOMMU drivers to implement
  74  *                                certain optimizations for these domains
  75  */
  76 #define IOMMU_DOMAIN_BLOCKED    (0U)
  77 #define IOMMU_DOMAIN_IDENTITY   (__IOMMU_DOMAIN_PT)
  78 #define IOMMU_DOMAIN_UNMANAGED  (__IOMMU_DOMAIN_PAGING)
  79 #define IOMMU_DOMAIN_DMA        (__IOMMU_DOMAIN_PAGING |        \
  80                                  __IOMMU_DOMAIN_DMA_API)
  81
  82 struct iommu_domain {
  83         unsigned type;
  84         const struct iommu_ops *ops;
  85         unsigned long pgsize_bitmap;    /* Bitmap of page sizes in use */
  86         iommu_fault_handler_t handler;
  87         void *handler_token;
  88         struct iommu_domain_geometry geometry;
  89         void *iova_cookie;
  90 };
  91
  92 enum iommu_cap {
  93         IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
  94                                            transactions */
  95         IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
  96         IOMMU_CAP_NOEXEC,               /* IOMMU_NOEXEC flag */
  97 };
  98
  99 /*
 100  * Following constraints are specifc to FSL_PAMUV1:
 101  *  -aperture must be power of 2, and naturally aligned
 102  *  -number of windows must be power of 2, and address space size
 103  *   of each window is determined by aperture size / # of windows
 104  *  -the actual size of the mapped region of a window must be power
 105  *   of 2 starting with 4KB and physical address must be naturally
 106  *   aligned.
 107  * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
 108  * The caller can invoke iommu_domain_get_attr to check if the underlying
 109  * iommu implementation supports these constraints.
 110  */
 111
 112 enum iommu_attr {
 113         DOMAIN_ATTR_GEOMETRY,
 114         DOMAIN_ATTR_PAGING,
 115         DOMAIN_ATTR_WINDOWS,
 116         DOMAIN_ATTR_FSL_PAMU_STASH,
 117         DOMAIN_ATTR_FSL_PAMU_ENABLE,
 118         DOMAIN_ATTR_FSL_PAMUV1,
 119         DOMAIN_ATTR_NESTING,    /* two stages of translation */
 120         DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
 121         DOMAIN_ATTR_IO_PGTABLE_CFG,
 122         DOMAIN_ATTR_MAX,
 123 };
 124
 125 /* These are the possible reserved region types */
 126 enum iommu_resv_type {
 127         /* Memory regions which must be mapped 1:1 at all times */
 128         IOMMU_RESV_DIRECT,
 129         /*
 130          * Memory regions which are advertised to be 1:1 but are
 131          * commonly considered relaxable in some conditions,
 132          * for instance in device assignment use case (USB, Graphics)
 133          */
 134         IOMMU_RESV_DIRECT_RELAXABLE,
 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 /* Per device IOMMU features */
 160 enum iommu_dev_features {
 161         IOMMU_DEV_FEAT_AUX,     /* Aux-domain feature */
 162         IOMMU_DEV_FEAT_SVA,     /* Shared Virtual Addresses */
 163 };
 164
 165 #define IOMMU_PASID_INVALID     (-1U)
 166
 167 #ifdef CONFIG_IOMMU_API
 168
 169 /**
 170  * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
 171  *
 172  * @start: IOVA representing the start of the range to be flushed
 173  * @end: IOVA representing the end of the range to be flushed (exclusive)
 174  * @pgsize: The interval at which to perform the flush
 175  *
 176  * This structure is intended to be updated by multiple calls to the
 177  * ->unmap() function in struct iommu_ops before eventually being passed
 178  * into ->iotlb_sync().
 179  */
 180 struct iommu_iotlb_gather {
 181         unsigned long           start;
 182         unsigned long           end;
 183         size_t                  pgsize;
 184         struct page             *freelist;
 185 };
 186
 187 /**
 188  * struct iommu_ops - iommu ops and capabilities
 189  * @capable: check capability
 190  * @domain_alloc: allocate iommu domain
 191  * @domain_free: free iommu domain
 192  * @attach_dev: attach device to an iommu domain
 193  * @detach_dev: detach device from an iommu domain
 194  * @map: map a physically contiguous memory region to an iommu domain
 195  * @unmap: unmap a physically contiguous memory region from an iommu domain
 196  * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
 197  * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
 198  * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
 199  *            queue
 200  * @iova_to_phys: translate iova to physical address
 201  * @probe_device: Add device to iommu driver handling
 202  * @release_device: Remove device from iommu driver handling
 203  * @probe_finalize: Do final setup work after the device is added to an IOMMU
 204  *                  group and attached to the groups domain
 205  * @device_group: find iommu group for a particular device
 206  * @domain_get_attr: Query domain attributes
 207  * @domain_set_attr: Change domain attributes
 208  * @get_resv_regions: Request list of reserved regions for a device
 209  * @put_resv_regions: Free list of reserved regions for a device
 210  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
 211  * @domain_window_enable: Configure and enable a particular window for a domain
 212  * @domain_window_disable: Disable a particular window for a domain
 213  * @of_xlate: add OF master IDs to iommu grouping
 214  * @is_attach_deferred: Check if domain attach should be deferred from iommu
 215  *                      driver init to device driver init (default no)
 216  * @dev_has/enable/disable_feat: per device entries to check/enable/disable
 217  *                               iommu specific features.
 218  * @dev_feat_enabled: check enabled feature
 219  * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
 220  * @aux_get_pasid: get the pasid given an aux-domain
 221  * @sva_bind: Bind process address space to device
 222  * @sva_unbind: Unbind process address space from device
 223  * @sva_get_pasid: Get PASID associated to a SVA handle
 224  * @page_response: handle page request response
 225  * @cache_invalidate: invalidate translation caches
 226  * @sva_bind_gpasid: bind guest pasid and mm
 227  * @sva_unbind_gpasid: unbind guest pasid and mm
 228  * @def_domain_type: device default domain type, return value:
 229  *              - IOMMU_DOMAIN_IDENTITY: must use an identity domain
 230  *              - IOMMU_DOMAIN_DMA: must use a dma domain
 231  *              - 0: use the default setting
 232  * @pgsize_bitmap: bitmap of all possible supported page sizes
 233  * @owner: Driver module providing these ops
 234  */
 235 struct iommu_ops {
 236         bool (*capable)(enum iommu_cap);
 237
 238         /* Domain allocation and freeing by the iommu driver */
 239         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 240         void (*domain_free)(struct iommu_domain *);
 241
 242         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 243         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 244         int (*map)(struct iommu_domain *domain, unsigned long iova,
 245                    phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
 246         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 247                      size_t size, struct iommu_iotlb_gather *iotlb_gather);
 248         void (*flush_iotlb_all)(struct iommu_domain *domain);
 249         void (*iotlb_sync_map)(struct iommu_domain *domain);
 250         void (*iotlb_sync)(struct iommu_domain *domain,
 251                            struct iommu_iotlb_gather *iotlb_gather);
 252         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 253         struct iommu_device *(*probe_device)(struct device *dev);
 254         void (*release_device)(struct device *dev);
 255         void (*probe_finalize)(struct device *dev);
 256         struct iommu_group *(*device_group)(struct device *dev);
 257         int (*domain_get_attr)(struct iommu_domain *domain,
 258                                enum iommu_attr attr, void *data);
 259         int (*domain_set_attr)(struct iommu_domain *domain,
 260                                enum iommu_attr attr, void *data);
 261
 262         /* Request/Free a list of reserved regions for a device */
 263         void (*get_resv_regions)(struct device *dev, struct list_head *list);
 264         void (*put_resv_regions)(struct device *dev, struct list_head *list);
 265         void (*apply_resv_region)(struct device *dev,
 266                                   struct iommu_domain *domain,
 267                                   struct iommu_resv_region *region);
 268
 269         /* Window handling functions */
 270         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 271                                     phys_addr_t paddr, u64 size, int prot);
 272         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 273
 274         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 275         bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 276
 277         /* Per device IOMMU features */
 278         bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
 279         bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
 280         int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
 281         int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
 282
 283         /* Aux-domain specific attach/detach entries */
 284         int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
 285         void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
 286         int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);
 287
 288         struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
 289                                       void *drvdata);
 290         void (*sva_unbind)(struct iommu_sva *handle);
 291         u32 (*sva_get_pasid)(struct iommu_sva *handle);
 292
 293         int (*page_response)(struct device *dev,
 294                              struct iommu_fault_event *evt,
 295                              struct iommu_page_response *msg);
 296         int (*cache_invalidate)(struct iommu_domain *domain, struct device *dev,
 297                                 struct iommu_cache_invalidate_info *inv_info);
 298         int (*sva_bind_gpasid)(struct iommu_domain *domain,
 299                         struct device *dev, struct iommu_gpasid_bind_data *data);
 300
 301         int (*sva_unbind_gpasid)(struct device *dev, u32 pasid);
 302
 303         int (*def_domain_type)(struct device *dev);
 304
 305         unsigned long pgsize_bitmap;
 306         struct module *owner;
 307 };
 308
 309 /**
 310  * struct iommu_device - IOMMU core representation of one IOMMU hardware
 311  *                       instance
 312  * @list: Used by the iommu-core to keep a list of registered iommus
 313  * @ops: iommu-ops for talking to this iommu
 314  * @dev: struct device for sysfs handling
 315  */
 316 struct iommu_device {
 317         struct list_head list;
 318         const struct iommu_ops *ops;
 319         struct fwnode_handle *fwnode;
 320         struct device *dev;
 321 };
 322
 323 /**
 324  * struct iommu_fault_event - Generic fault event
 325  *
 326  * Can represent recoverable faults such as a page requests or
 327  * unrecoverable faults such as DMA or IRQ remapping faults.
 328  *
 329  * @fault: fault descriptor
 330  * @list: pending fault event list, used for tracking responses
 331  */
 332 struct iommu_fault_event {
 333         struct iommu_fault fault;
 334         struct list_head list;
 335 };
 336
 337 /**
 338  * struct iommu_fault_param - per-device IOMMU fault data
 339  * @handler: Callback function to handle IOMMU faults at device level
 340  * @data: handler private data
 341  * @faults: holds the pending faults which needs response
 342  * @lock: protect pending faults list
 343  */
 344 struct iommu_fault_param {
 345         iommu_dev_fault_handler_t handler;
 346         void *data;
 347         struct list_head faults;
 348         struct mutex lock;
 349 };
 350
 351 /**
 352  * struct dev_iommu - Collection of per-device IOMMU data
 353  *
 354  * @fault_param: IOMMU detected device fault reporting data
 355  * @fwspec:      IOMMU fwspec data
 356  * @iommu_dev:   IOMMU device this device is linked to
 357  * @priv:        IOMMU Driver private data
 358  *
 359  * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
 360  *      struct iommu_group      *iommu_group;
 361  */
 362 struct dev_iommu {
 363         struct mutex lock;
 364         struct iommu_fault_param        *fault_param;
 365         struct iommu_fwspec             *fwspec;
 366         struct iommu_device             *iommu_dev;
 367         void                            *priv;
 368 };
 369
 370 int  iommu_device_register(struct iommu_device *iommu);
 371 void iommu_device_unregister(struct iommu_device *iommu);
 372 int  iommu_device_sysfs_add(struct iommu_device *iommu,
 373                             struct device *parent,
 374                             const struct attribute_group **groups,
 375                             const char *fmt, ...) __printf(4, 5);
 376 void iommu_device_sysfs_remove(struct iommu_device *iommu);
 377 int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
 378 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
 379
 380 static inline void __iommu_device_set_ops(struct iommu_device *iommu,
 381                                           const struct iommu_ops *ops)
 382 {
 383         iommu->ops = ops;
 384 }
 385
 386 #define iommu_device_set_ops(iommu, ops)                                \
 387 do {                                                                    \
 388         struct iommu_ops *__ops = (struct iommu_ops *)(ops);            \
 389         __ops->owner = THIS_MODULE;                                     \
 390         __iommu_device_set_ops(iommu, __ops);                           \
 391 } while (0)
 392
 393 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 394                                            struct fwnode_handle *fwnode)
 395 {
 396         iommu->fwnode = fwnode;
 397 }
 398
 399 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 400 {
 401         return (struct iommu_device *)dev_get_drvdata(dev);
 402 }
 403
 404 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
 405 {
 406         *gather = (struct iommu_iotlb_gather) {
 407                 .start  = ULONG_MAX,
 408         };
 409 }
 410
 411 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 412 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 413 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 414 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 415 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 416 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 417
 418 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 419 extern int bus_iommu_probe(struct bus_type *bus);
 420 extern bool iommu_present(struct bus_type *bus);
 421 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 422 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 423 extern struct iommu_group *iommu_group_get_by_id(int id);
 424 extern void iommu_domain_free(struct iommu_domain *domain);
 425 extern int iommu_attach_device(struct iommu_domain *domain,
 426                                struct device *dev);
 427 extern void iommu_detach_device(struct iommu_domain *domain,
 428                                 struct device *dev);
 429 extern int iommu_uapi_cache_invalidate(struct iommu_domain *domain,
 430                                        struct device *dev,
 431                                        void __user *uinfo);
 432
 433 extern int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
 434                                       struct device *dev, void __user *udata);
 435 extern int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
 436                                         struct device *dev, void __user *udata);
 437 extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
 438                                    struct device *dev, ioasid_t pasid);
 439 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 440 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
 441 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 442                      phys_addr_t paddr, size_t size, int prot);
 443 extern int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova,
 444                             phys_addr_t paddr, size_t size, int prot);
 445 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 446                           size_t size);
 447 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
 448                                unsigned long iova, size_t size,
 449                                struct iommu_iotlb_gather *iotlb_gather);
 450 extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 451                            struct scatterlist *sg,unsigned int nents, int prot);
 452 extern size_t iommu_map_sg_atomic(struct iommu_domain *domain,
 453                                   unsigned long iova, struct scatterlist *sg,
 454                                   unsigned int nents, int prot);
 455 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 456 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 457                         iommu_fault_handler_t handler, void *token);
 458
 459 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 460 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 461 extern void generic_iommu_put_resv_regions(struct device *dev,
 462                                            struct list_head *list);
 463 extern void iommu_set_default_passthrough(bool cmd_line);
 464 extern void iommu_set_default_translated(bool cmd_line);
 465 extern bool iommu_default_passthrough(void);
 466 extern struct iommu_resv_region *
 467 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
 468                         enum iommu_resv_type type);
 469 extern int iommu_get_group_resv_regions(struct iommu_group *group,
 470                                         struct list_head *head);
 471
 472 extern int iommu_attach_group(struct iommu_domain *domain,
 473                               struct iommu_group *group);
 474 extern void iommu_detach_group(struct iommu_domain *domain,
 475                                struct iommu_group *group);
 476 extern struct iommu_group *iommu_group_alloc(void);
 477 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 478 extern void iommu_group_set_iommudata(struct iommu_group *group,
 479                                       void *iommu_data,
 480                                       void (*release)(void *iommu_data));
 481 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 482 extern int iommu_group_add_device(struct iommu_group *group,
 483                                   struct device *dev);
 484 extern void iommu_group_remove_device(struct device *dev);
 485 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 486                                     int (*fn)(struct device *, void *));
 487 extern struct iommu_group *iommu_group_get(struct device *dev);
 488 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 489 extern void iommu_group_put(struct iommu_group *group);
 490 extern int iommu_group_register_notifier(struct iommu_group *group,
 491                                          struct notifier_block *nb);
 492 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 493                                            struct notifier_block *nb);
 494 extern int iommu_register_device_fault_handler(struct device *dev,
 495                                         iommu_dev_fault_handler_t handler,
 496                                         void *data);
 497
 498 extern int iommu_unregister_device_fault_handler(struct device *dev);
 499
 500 extern int iommu_report_device_fault(struct device *dev,
 501                                      struct iommu_fault_event *evt);
 502 extern int iommu_page_response(struct device *dev,
 503                                struct iommu_page_response *msg);
 504
 505 extern int iommu_group_id(struct iommu_group *group);
 506 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 507
 508 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 509                                  void *data);
 510 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 511                                  void *data);
 512
 513 /* Window handling function prototypes */
 514 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 515                                       phys_addr_t offset, u64 size,
 516                                       int prot);
 517 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 518
 519 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 520                               unsigned long iova, int flags);
 521
 522 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
 523 {
 524         if (domain->ops->flush_iotlb_all)
 525                 domain->ops->flush_iotlb_all(domain);
 526 }
 527
 528 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
 529                                   struct iommu_iotlb_gather *iotlb_gather)
 530 {
 531         if (domain->ops->iotlb_sync)
 532                 domain->ops->iotlb_sync(domain, iotlb_gather);
 533
 534         iommu_iotlb_gather_init(iotlb_gather);
 535 }
 536
 537 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
 538                                                struct iommu_iotlb_gather *gather,
 539                                                unsigned long iova, size_t size)
 540 {
 541         unsigned long start = iova, end = start + size;
 542
 543         /*
 544          * If the new page is disjoint from the current range or is mapped at
 545          * a different granularity, then sync the TLB so that the gather
 546          * structure can be rewritten.
 547          */
 548         if (gather->pgsize != size ||
 549             end < gather->start || start > gather->end) {
 550                 if (gather->pgsize)
 551                         iommu_iotlb_sync(domain, gather);
 552                 gather->pgsize = size;
 553         }
 554
 555         if (gather->end < end)
 556                 gather->end = end;
 557
 558         if (gather->start > start)
 559                 gather->start = start;
 560 }
 561
 562 /* PCI device grouping function */
 563 extern struct iommu_group *pci_device_group(struct device *dev);
 564 /* Generic device grouping function */
 565 extern struct iommu_group *generic_device_group(struct device *dev);
 566 /* FSL-MC device grouping function */
 567 struct iommu_group *fsl_mc_device_group(struct device *dev);
 568
 569 /**
 570  * struct iommu_fwspec - per-device IOMMU instance data
 571  * @ops: ops for this device's IOMMU
 572  * @iommu_fwnode: firmware handle for this device's IOMMU
 573  * @iommu_priv: IOMMU driver private data for this device
 574  * @num_pasid_bits: number of PASID bits supported by this device
 575  * @num_ids: number of associated device IDs
 576  * @ids: IDs which this device may present to the IOMMU
 577  */
 578 struct iommu_fwspec {
 579         const struct iommu_ops  *ops;
 580         struct fwnode_handle    *iommu_fwnode;
 581         u32                     flags;
 582         u32                     num_pasid_bits;
 583         unsigned int            num_ids;
 584         u32                     ids[];
 585 };
 586
 587 /* ATS is supported */
 588 #define IOMMU_FWSPEC_PCI_RC_ATS                 (1 << 0)
 589
 590 /**
 591  * struct iommu_sva - handle to a device-mm bond
 592  */
 593 struct iommu_sva {
 594         struct device                   *dev;
 595 };
 596
 597 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 598                       const struct iommu_ops *ops);
 599 void iommu_fwspec_free(struct device *dev);
 600 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 601 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 602
 603 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
 604 {
 605         if (dev->iommu)
 606                 return dev->iommu->fwspec;
 607         else
 608                 return NULL;
 609 }
 610
 611 static inline void dev_iommu_fwspec_set(struct device *dev,
 612                                         struct iommu_fwspec *fwspec)
 613 {
 614         dev->iommu->fwspec = fwspec;
 615 }
 616
 617 static inline void *dev_iommu_priv_get(struct device *dev)
 618 {
 619         return dev->iommu->priv;
 620 }
 621
 622 static inline void dev_iommu_priv_set(struct device *dev, void *priv)
 623 {
 624         dev->iommu->priv = priv;
 625 }
 626
 627 int iommu_probe_device(struct device *dev);
 628 void iommu_release_device(struct device *dev);
 629
 630 bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
 631 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
 632 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
 633 bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
 634 int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
 635 void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
 636 int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);
 637
 638 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
 639                                         struct mm_struct *mm,
 640                                         void *drvdata);
 641 void iommu_sva_unbind_device(struct iommu_sva *handle);
 642 u32 iommu_sva_get_pasid(struct iommu_sva *handle);
 643
 644 #else /* CONFIG_IOMMU_API */
 645
 646 struct iommu_ops {};
 647 struct iommu_group {};
 648 struct iommu_fwspec {};
 649 struct iommu_device {};
 650 struct iommu_fault_param {};
 651 struct iommu_iotlb_gather {};
 652
 653 static inline bool iommu_present(struct bus_type *bus)
 654 {
 655         return false;
 656 }
 657
 658 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 659 {
 660         return false;
 661 }
 662
 663 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 664 {
 665         return NULL;
 666 }
 667
 668 static inline struct iommu_group *iommu_group_get_by_id(int id)
 669 {
 670         return NULL;
 671 }
 672
 673 static inline void iommu_domain_free(struct iommu_domain *domain)
 674 {
 675 }
 676
 677 static inline int iommu_attach_device(struct iommu_domain *domain,
 678                                       struct device *dev)
 679 {
 680         return -ENODEV;
 681 }
 682
 683 static inline void iommu_detach_device(struct iommu_domain *domain,
 684                                        struct device *dev)
 685 {
 686 }
 687
 688 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 689 {
 690         return NULL;
 691 }
 692
 693 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 694                             phys_addr_t paddr, size_t size, int prot)
 695 {
 696         return -ENODEV;
 697 }
 698
 699 static inline int iommu_map_atomic(struct iommu_domain *domain,
 700                                    unsigned long iova, phys_addr_t paddr,
 701                                    size_t size, int prot)
 702 {
 703         return -ENODEV;
 704 }
 705
 706 static inline size_t iommu_unmap(struct iommu_domain *domain,
 707                                  unsigned long iova, size_t size)
 708 {
 709         return 0;
 710 }
 711
 712 static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
 713                                       unsigned long iova, int gfp_order,
 714                                       struct iommu_iotlb_gather *iotlb_gather)
 715 {
 716         return 0;
 717 }
 718
 719 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 720                                   unsigned long iova, struct scatterlist *sg,
 721                                   unsigned int nents, int prot)
 722 {
 723         return 0;
 724 }
 725
 726 static inline size_t iommu_map_sg_atomic(struct iommu_domain *domain,
 727                                   unsigned long iova, struct scatterlist *sg,
 728                                   unsigned int nents, int prot)
 729 {
 730         return 0;
 731 }
 732
 733 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
 734 {
 735 }
 736
 737 static inline void iommu_iotlb_sync(struct iommu_domain *domain,
 738                                   struct iommu_iotlb_gather *iotlb_gather)
 739 {
 740 }
 741
 742 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 743                                              u32 wnd_nr, phys_addr_t paddr,
 744                                              u64 size, int prot)
 745 {
 746         return -ENODEV;
 747 }
 748
 749 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 750                                                u32 wnd_nr)
 751 {
 752 }
 753
 754 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 755 {
 756         return 0;
 757 }
 758
 759 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 760                                 iommu_fault_handler_t handler, void *token)
 761 {
 762 }
 763
 764 static inline void iommu_get_resv_regions(struct device *dev,
 765                                         struct list_head *list)
 766 {
 767 }
 768
 769 static inline void iommu_put_resv_regions(struct device *dev,
 770                                         struct list_head *list)
 771 {
 772 }
 773
 774 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
 775                                                struct list_head *head)
 776 {
 777         return -ENODEV;
 778 }
 779
 780 static inline void iommu_set_default_passthrough(bool cmd_line)
 781 {
 782 }
 783
 784 static inline void iommu_set_default_translated(bool cmd_line)
 785 {
 786 }
 787
 788 static inline bool iommu_default_passthrough(void)
 789 {
 790         return true;
 791 }
 792
 793 static inline int iommu_attach_group(struct iommu_domain *domain,
 794                                      struct iommu_group *group)
 795 {
 796         return -ENODEV;
 797 }
 798
 799 static inline void iommu_detach_group(struct iommu_domain *domain,
 800                                       struct iommu_group *group)
 801 {
 802 }
 803
 804 static inline struct iommu_group *iommu_group_alloc(void)
 805 {
 806         return ERR_PTR(-ENODEV);
 807 }
 808
 809 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 810 {
 811         return NULL;
 812 }
 813
 814 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 815                                              void *iommu_data,
 816                                              void (*release)(void *iommu_data))
 817 {
 818 }
 819
 820 static inline int iommu_group_set_name(struct iommu_group *group,
 821                                        const char *name)
 822 {
 823         return -ENODEV;
 824 }
 825
 826 static inline int iommu_group_add_device(struct iommu_group *group,
 827                                          struct device *dev)
 828 {
 829         return -ENODEV;
 830 }
 831
 832 static inline void iommu_group_remove_device(struct device *dev)
 833 {
 834 }
 835
 836 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 837                                            void *data,
 838                                            int (*fn)(struct device *, void *))
 839 {
 840         return -ENODEV;
 841 }
 842
 843 static inline struct iommu_group *iommu_group_get(struct device *dev)
 844 {
 845         return NULL;
 846 }
 847
 848 static inline void iommu_group_put(struct iommu_group *group)
 849 {
 850 }
 851
 852 static inline int iommu_group_register_notifier(struct iommu_group *group,
 853                                                 struct notifier_block *nb)
 854 {
 855         return -ENODEV;
 856 }
 857
 858 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 859                                                   struct notifier_block *nb)
 860 {
 861         return 0;
 862 }
 863
 864 static inline
 865 int iommu_register_device_fault_handler(struct device *dev,
 866                                         iommu_dev_fault_handler_t handler,
 867                                         void *data)
 868 {
 869         return -ENODEV;
 870 }
 871
 872 static inline int iommu_unregister_device_fault_handler(struct device *dev)
 873 {
 874         return 0;
 875 }
 876
 877 static inline
 878 int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
 879 {
 880         return -ENODEV;
 881 }
 882
 883 static inline int iommu_page_response(struct device *dev,
 884                                       struct iommu_page_response *msg)
 885 {
 886         return -ENODEV;
 887 }
 888
 889 static inline int iommu_group_id(struct iommu_group *group)
 890 {
 891         return -ENODEV;
 892 }
 893
 894 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 895                                         enum iommu_attr attr, void *data)
 896 {
 897         return -EINVAL;
 898 }
 899
 900 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 901                                         enum iommu_attr attr, void *data)
 902 {
 903         return -EINVAL;
 904 }
 905
 906 static inline int  iommu_device_register(struct iommu_device *iommu)
 907 {
 908         return -ENODEV;
 909 }
 910
 911 static inline void iommu_device_set_ops(struct iommu_device *iommu,
 912                                         const struct iommu_ops *ops)
 913 {
 914 }
 915
 916 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 917                                            struct fwnode_handle *fwnode)
 918 {
 919 }
 920
 921 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
 922 {
 923         return NULL;
 924 }
 925
 926 static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
 927 {
 928 }
 929
 930 static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
 931                                                struct iommu_iotlb_gather *gather,
 932                                                unsigned long iova, size_t size)
 933 {
 934 }
 935
 936 static inline void iommu_device_unregister(struct iommu_device *iommu)
 937 {
 938 }
 939
 940 static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
 941                                           struct device *parent,
 942                                           const struct attribute_group **groups,
 943                                           const char *fmt, ...)
 944 {
 945         return -ENODEV;
 946 }
 947
 948 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
 949 {
 950 }
 951
 952 static inline int iommu_device_link(struct device *dev, struct device *link)
 953 {
 954         return -EINVAL;
 955 }
 956
 957 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 958 {
 959 }
 960
 961 static inline int iommu_fwspec_init(struct device *dev,
 962                                     struct fwnode_handle *iommu_fwnode,
 963                                     const struct iommu_ops *ops)
 964 {
 965         return -ENODEV;
 966 }
 967
 968 static inline void iommu_fwspec_free(struct device *dev)
 969 {
 970 }
 971
 972 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 973                                        int num_ids)
 974 {
 975         return -ENODEV;
 976 }
 977
 978 static inline
 979 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 980 {
 981         return NULL;
 982 }
 983
 984 static inline bool
 985 iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
 986 {
 987         return false;
 988 }
 989
 990 static inline bool
 991 iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
 992 {
 993         return false;
 994 }
 995
 996 static inline int
 997 iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
 998 {
 999         return -ENODEV;
1000 }
1001
1002 static inline int
1003 iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
1004 {
1005         return -ENODEV;
1006 }
1007
1008 static inline int
1009 iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
1010 {
1011         return -ENODEV;
1012 }
1013
1014 static inline void
1015 iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
1016 {
1017 }
1018
1019 static inline int
1020 iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
1021 {
1022         return -ENODEV;
1023 }
1024
1025 static inline struct iommu_sva *
1026 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
1027 {
1028         return NULL;
1029 }
1030
1031 static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
1032 {
1033 }
1034
1035 static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1036 {
1037         return IOMMU_PASID_INVALID;
1038 }
1039
1040 static inline int
1041 iommu_uapi_cache_invalidate(struct iommu_domain *domain,
1042                             struct device *dev,
1043                             struct iommu_cache_invalidate_info *inv_info)
1044 {
1045         return -ENODEV;
1046 }
1047
1048 static inline int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
1049                                              struct device *dev, void __user *udata)
1050 {
1051         return -ENODEV;
1052 }
1053
1054 static inline int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
1055                                                struct device *dev, void __user *udata)
1056 {
1057         return -ENODEV;
1058 }
1059
1060 static inline int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
1061                                           struct device *dev,
1062                                           ioasid_t pasid)
1063 {
1064         return -ENODEV;
1065 }
1066
1067 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
1068 {
1069         return NULL;
1070 }
1071 #endif /* CONFIG_IOMMU_API */
1072
1073 /**
1074  * iommu_map_sgtable - Map the given buffer to the IOMMU domain
1075  * @domain:     The IOMMU domain to perform the mapping
1076  * @iova:       The start address to map the buffer
1077  * @sgt:        The sg_table object describing the buffer
1078  * @prot:       IOMMU protection bits
1079  *
1080  * Creates a mapping at @iova for the buffer described by a scatterlist
1081  * stored in the given sg_table object in the provided IOMMU domain.
1082  */
1083 static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
1084                         unsigned long iova, struct sg_table *sgt, int prot)
1085 {
1086         return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot);
1087 }
1088
1089 #ifdef CONFIG_IOMMU_DEBUGFS
1090 extern  struct dentry *iommu_debugfs_dir;
1091 void iommu_debugfs_setup(void);
1092 #else
1093 static inline void iommu_debugfs_setup(void) {}
1094 #endif
1095
1096 #endif /* __LINUX_IOMMU_H */