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/errno.h>
  23 #include <linux/err.h>
  24 #include <linux/of.h>
  25 #include <linux/types.h>
  26 #include <linux/scatterlist.h>
  27 #include <trace/events/iommu.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
  34 struct iommu_ops;
  35 struct iommu_group;
  36 struct bus_type;
  37 struct device;
  38 struct iommu_domain;
  39 struct notifier_block;
  40
  41 /* iommu fault flags */
  42 #define IOMMU_FAULT_READ        0x0
  43 #define IOMMU_FAULT_WRITE       0x1
  44
  45 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  46                         struct device *, unsigned long, int, void *);
  47
  48 struct iommu_domain_geometry {
  49         dma_addr_t aperture_start; /* First address that can be mapped    */
  50         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  51         bool force_aperture;       /* DMA only allowed in mappable range? */
  52 };
  53
  54 /* Domain feature flags */
  55 #define __IOMMU_DOMAIN_PAGING   (1U << 0)  /* Support for iommu_map/unmap */
  56 #define __IOMMU_DOMAIN_DMA_API  (1U << 1)  /* Domain for use in DMA-API
  57                                               implementation              */
  58 #define __IOMMU_DOMAIN_PT       (1U << 2)  /* Domain is identity mapped   */
  59
  60 /*
  61  * This are the possible domain-types
  62  *
  63  *      IOMMU_DOMAIN_BLOCKED    - All DMA is blocked, can be used to isolate
  64  *                                devices
  65  *      IOMMU_DOMAIN_IDENTITY   - DMA addresses are system physical addresses
  66  *      IOMMU_DOMAIN_UNMANAGED  - DMA mappings managed by IOMMU-API user, used
  67  *                                for VMs
  68  *      IOMMU_DOMAIN_DMA        - Internally used for DMA-API implementations.
  69  *                                This flag allows IOMMU drivers to implement
  70  *                                certain optimizations for these domains
  71  */
  72 #define IOMMU_DOMAIN_BLOCKED    (0U)
  73 #define IOMMU_DOMAIN_IDENTITY   (__IOMMU_DOMAIN_PT)
  74 #define IOMMU_DOMAIN_UNMANAGED  (__IOMMU_DOMAIN_PAGING)
  75 #define IOMMU_DOMAIN_DMA        (__IOMMU_DOMAIN_PAGING |        \
  76                                  __IOMMU_DOMAIN_DMA_API)
  77
  78 struct iommu_domain {
  79         unsigned type;
  80         const struct iommu_ops *ops;
  81         iommu_fault_handler_t handler;
  82         void *handler_token;
  83         struct iommu_domain_geometry geometry;
  84 };
  85
  86 enum iommu_cap {
  87         IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
  88                                            transactions */
  89         IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
  90         IOMMU_CAP_NOEXEC,               /* IOMMU_NOEXEC flag */
  91 };
  92
  93 /*
  94  * Following constraints are specifc to FSL_PAMUV1:
  95  *  -aperture must be power of 2, and naturally aligned
  96  *  -number of windows must be power of 2, and address space size
  97  *   of each window is determined by aperture size / # of windows
  98  *  -the actual size of the mapped region of a window must be power
  99  *   of 2 starting with 4KB and physical address must be naturally
 100  *   aligned.
 101  * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
 102  * The caller can invoke iommu_domain_get_attr to check if the underlying
 103  * iommu implementation supports these constraints.
 104  */
 105
 106 enum iommu_attr {
 107         DOMAIN_ATTR_GEOMETRY,
 108         DOMAIN_ATTR_PAGING,
 109         DOMAIN_ATTR_WINDOWS,
 110         DOMAIN_ATTR_FSL_PAMU_STASH,
 111         DOMAIN_ATTR_FSL_PAMU_ENABLE,
 112         DOMAIN_ATTR_FSL_PAMUV1,
 113         DOMAIN_ATTR_NESTING,    /* two stages of translation */
 114         DOMAIN_ATTR_MAX,
 115 };
 116
 117 /**
 118  * struct iommu_dm_region - descriptor for a direct mapped memory region
 119  * @list: Linked list pointers
 120  * @start: System physical start address of the region
 121  * @length: Length of the region in bytes
 122  * @prot: IOMMU Protection flags (READ/WRITE/...)
 123  */
 124 struct iommu_dm_region {
 125         struct list_head        list;
 126         phys_addr_t             start;
 127         size_t                  length;
 128         int                     prot;
 129 };
 130
 131 #ifdef CONFIG_IOMMU_API
 132
 133 /**
 134  * struct iommu_ops - iommu ops and capabilities
 135  * @domain_init: init iommu domain
 136  * @domain_destroy: destroy iommu domain
 137  * @attach_dev: attach device to an iommu domain
 138  * @detach_dev: detach device from an iommu domain
 139  * @map: map a physically contiguous memory region to an iommu domain
 140  * @unmap: unmap a physically contiguous memory region from an iommu domain
 141  * @map_sg: map a scatter-gather list of physically contiguous memory chunks
 142  * to an iommu domain
 143  * @iova_to_phys: translate iova to physical address
 144  * @add_device: add device to iommu grouping
 145  * @remove_device: remove device from iommu grouping
 146  * @domain_get_attr: Query domain attributes
 147  * @domain_set_attr: Change domain attributes
 148  * @of_xlate: add OF master IDs to iommu grouping
 149  * @pgsize_bitmap: bitmap of supported page sizes
 150  * @priv: per-instance data private to the iommu driver
 151  */
 152 struct iommu_ops {
 153         bool (*capable)(enum iommu_cap);
 154
 155         /* Domain allocation and freeing by the iommu driver */
 156         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 157         void (*domain_free)(struct iommu_domain *);
 158
 159         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 160         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 161         int (*map)(struct iommu_domain *domain, unsigned long iova,
 162                    phys_addr_t paddr, size_t size, int prot);
 163         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 164                      size_t size);
 165         size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
 166                          struct scatterlist *sg, unsigned int nents, int prot);
 167         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 168         int (*add_device)(struct device *dev);
 169         void (*remove_device)(struct device *dev);
 170         int (*device_group)(struct device *dev, unsigned int *groupid);
 171         int (*domain_get_attr)(struct iommu_domain *domain,
 172                                enum iommu_attr attr, void *data);
 173         int (*domain_set_attr)(struct iommu_domain *domain,
 174                                enum iommu_attr attr, void *data);
 175
 176         /* Request/Free a list of direct mapping requirements for a device */
 177         void (*get_dm_regions)(struct device *dev, struct list_head *list);
 178         void (*put_dm_regions)(struct device *dev, struct list_head *list);
 179
 180         /* Window handling functions */
 181         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 182                                     phys_addr_t paddr, u64 size, int prot);
 183         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 184         /* Set the numer of window per domain */
 185         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 186         /* Get the numer of window per domain */
 187         u32 (*domain_get_windows)(struct iommu_domain *domain);
 188
 189 #ifdef CONFIG_OF_IOMMU
 190         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 191 #endif
 192
 193         unsigned long pgsize_bitmap;
 194         void *priv;
 195 };
 196
 197 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 198 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 199 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 200 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 201 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 202 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 203
 204 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 205 extern bool iommu_present(struct bus_type *bus);
 206 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 207 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 208 extern struct iommu_group *iommu_group_get_by_id(int id);
 209 extern void iommu_domain_free(struct iommu_domain *domain);
 210 extern int iommu_attach_device(struct iommu_domain *domain,
 211                                struct device *dev);
 212 extern void iommu_detach_device(struct iommu_domain *domain,
 213                                 struct device *dev);
 214 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 215 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 216                      phys_addr_t paddr, size_t size, int prot);
 217 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 218                        size_t size);
 219 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 220                                 struct scatterlist *sg,unsigned int nents,
 221                                 int prot);
 222 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 223 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 224                         iommu_fault_handler_t handler, void *token);
 225
 226 extern void iommu_get_dm_regions(struct device *dev, struct list_head *list);
 227 extern void iommu_put_dm_regions(struct device *dev, struct list_head *list);
 228 extern int iommu_request_dm_for_dev(struct device *dev);
 229
 230 extern int iommu_attach_group(struct iommu_domain *domain,
 231                               struct iommu_group *group);
 232 extern void iommu_detach_group(struct iommu_domain *domain,
 233                                struct iommu_group *group);
 234 extern struct iommu_group *iommu_group_alloc(void);
 235 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 236 extern void iommu_group_set_iommudata(struct iommu_group *group,
 237                                       void *iommu_data,
 238                                       void (*release)(void *iommu_data));
 239 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 240 extern int iommu_group_add_device(struct iommu_group *group,
 241                                   struct device *dev);
 242 extern void iommu_group_remove_device(struct device *dev);
 243 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 244                                     int (*fn)(struct device *, void *));
 245 extern struct iommu_group *iommu_group_get(struct device *dev);
 246 extern void iommu_group_put(struct iommu_group *group);
 247 extern int iommu_group_register_notifier(struct iommu_group *group,
 248                                          struct notifier_block *nb);
 249 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 250                                            struct notifier_block *nb);
 251 extern int iommu_group_id(struct iommu_group *group);
 252 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 253 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 254
 255 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 256                                  void *data);
 257 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 258                                  void *data);
 259 struct device *iommu_device_create(struct device *parent, void *drvdata,
 260                                    const struct attribute_group **groups,
 261                                    const char *fmt, ...);
 262 void iommu_device_destroy(struct device *dev);
 263 int iommu_device_link(struct device *dev, struct device *link);
 264 void iommu_device_unlink(struct device *dev, struct device *link);
 265
 266 /* Window handling function prototypes */
 267 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 268                                       phys_addr_t offset, u64 size,
 269                                       int prot);
 270 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 271 /**
 272  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
 273  * @domain: the iommu domain where the fault has happened
 274  * @dev: the device where the fault has happened
 275  * @iova: the faulting address
 276  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
 277  *
 278  * This function should be called by the low-level IOMMU implementations
 279  * whenever IOMMU faults happen, to allow high-level users, that are
 280  * interested in such events, to know about them.
 281  *
 282  * This event may be useful for several possible use cases:
 283  * - mere logging of the event
 284  * - dynamic TLB/PTE loading
 285  * - if restarting of the faulting device is required
 286  *
 287  * Returns 0 on success and an appropriate error code otherwise (if dynamic
 288  * PTE/TLB loading will one day be supported, implementations will be able
 289  * to tell whether it succeeded or not according to this return value).
 290  *
 291  * Specifically, -ENOSYS is returned if a fault handler isn't installed
 292  * (though fault handlers can also return -ENOSYS, in case they want to
 293  * elicit the default behavior of the IOMMU drivers).
 294  */
 295 static inline int report_iommu_fault(struct iommu_domain *domain,
 296                 struct device *dev, unsigned long iova, int flags)
 297 {
 298         int ret = -ENOSYS;
 299
 300         /*
 301          * if upper layers showed interest and installed a fault handler,
 302          * invoke it.
 303          */
 304         if (domain->handler)
 305                 ret = domain->handler(domain, dev, iova, flags,
 306                                                 domain->handler_token);
 307
 308         trace_io_page_fault(dev, iova, flags);
 309         return ret;
 310 }
 311
 312 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 313                                   unsigned long iova, struct scatterlist *sg,
 314                                   unsigned int nents, int prot)
 315 {
 316         return domain->ops->map_sg(domain, iova, sg, nents, prot);
 317 }
 318
 319 #else /* CONFIG_IOMMU_API */
 320
 321 struct iommu_ops {};
 322 struct iommu_group {};
 323
 324 static inline bool iommu_present(struct bus_type *bus)
 325 {
 326         return false;
 327 }
 328
 329 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 330 {
 331         return false;
 332 }
 333
 334 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 335 {
 336         return NULL;
 337 }
 338
 339 static inline struct iommu_group *iommu_group_get_by_id(int id)
 340 {
 341         return NULL;
 342 }
 343
 344 static inline void iommu_domain_free(struct iommu_domain *domain)
 345 {
 346 }
 347
 348 static inline int iommu_attach_device(struct iommu_domain *domain,
 349                                       struct device *dev)
 350 {
 351         return -ENODEV;
 352 }
 353
 354 static inline void iommu_detach_device(struct iommu_domain *domain,
 355                                        struct device *dev)
 356 {
 357 }
 358
 359 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 360 {
 361         return NULL;
 362 }
 363
 364 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 365                             phys_addr_t paddr, int gfp_order, int prot)
 366 {
 367         return -ENODEV;
 368 }
 369
 370 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 371                               int gfp_order)
 372 {
 373         return -ENODEV;
 374 }
 375
 376 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 377                                   unsigned long iova, struct scatterlist *sg,
 378                                   unsigned int nents, int prot)
 379 {
 380         return -ENODEV;
 381 }
 382
 383 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 384                                              u32 wnd_nr, phys_addr_t paddr,
 385                                              u64 size, int prot)
 386 {
 387         return -ENODEV;
 388 }
 389
 390 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 391                                                u32 wnd_nr)
 392 {
 393 }
 394
 395 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 396 {
 397         return 0;
 398 }
 399
 400 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 401                                 iommu_fault_handler_t handler, void *token)
 402 {
 403 }
 404
 405 static inline void iommu_get_dm_regions(struct device *dev,
 406                                         struct list_head *list)
 407 {
 408 }
 409
 410 static inline void iommu_put_dm_regions(struct device *dev,
 411                                         struct list_head *list)
 412 {
 413 }
 414
 415 static inline int iommu_request_dm_for_dev(struct device *dev)
 416 {
 417         return -ENODEV;
 418 }
 419
 420 static inline int iommu_attach_group(struct iommu_domain *domain,
 421                                      struct iommu_group *group)
 422 {
 423         return -ENODEV;
 424 }
 425
 426 static inline void iommu_detach_group(struct iommu_domain *domain,
 427                                       struct iommu_group *group)
 428 {
 429 }
 430
 431 static inline struct iommu_group *iommu_group_alloc(void)
 432 {
 433         return ERR_PTR(-ENODEV);
 434 }
 435
 436 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 437 {
 438         return NULL;
 439 }
 440
 441 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 442                                              void *iommu_data,
 443                                              void (*release)(void *iommu_data))
 444 {
 445 }
 446
 447 static inline int iommu_group_set_name(struct iommu_group *group,
 448                                        const char *name)
 449 {
 450         return -ENODEV;
 451 }
 452
 453 static inline int iommu_group_add_device(struct iommu_group *group,
 454                                          struct device *dev)
 455 {
 456         return -ENODEV;
 457 }
 458
 459 static inline void iommu_group_remove_device(struct device *dev)
 460 {
 461 }
 462
 463 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 464                                            void *data,
 465                                            int (*fn)(struct device *, void *))
 466 {
 467         return -ENODEV;
 468 }
 469
 470 static inline struct iommu_group *iommu_group_get(struct device *dev)
 471 {
 472         return NULL;
 473 }
 474
 475 static inline void iommu_group_put(struct iommu_group *group)
 476 {
 477 }
 478
 479 static inline int iommu_group_register_notifier(struct iommu_group *group,
 480                                                 struct notifier_block *nb)
 481 {
 482         return -ENODEV;
 483 }
 484
 485 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 486                                                   struct notifier_block *nb)
 487 {
 488         return 0;
 489 }
 490
 491 static inline int iommu_group_id(struct iommu_group *group)
 492 {
 493         return -ENODEV;
 494 }
 495
 496 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 497                                         enum iommu_attr attr, void *data)
 498 {
 499         return -EINVAL;
 500 }
 501
 502 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 503                                         enum iommu_attr attr, void *data)
 504 {
 505         return -EINVAL;
 506 }
 507
 508 static inline struct device *iommu_device_create(struct device *parent,
 509                                         void *drvdata,
 510                                         const struct attribute_group **groups,
 511                                         const char *fmt, ...)
 512 {
 513         return ERR_PTR(-ENODEV);
 514 }
 515
 516 static inline void iommu_device_destroy(struct device *dev)
 517 {
 518 }
 519
 520 static inline int iommu_device_link(struct device *dev, struct device *link)
 521 {
 522         return -EINVAL;
 523 }
 524
 525 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 526 {
 527 }
 528
 529 #endif /* CONFIG_IOMMU_API */
 530
 531 #endif /* __LINUX_IOMMU_H */