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 #ifdef CONFIG_IOMMU_API
 118
 119 /**
 120  * struct iommu_ops - iommu ops and capabilities
 121  * @domain_init: init iommu domain
 122  * @domain_destroy: destroy iommu domain
 123  * @attach_dev: attach device to an iommu domain
 124  * @detach_dev: detach device from an iommu domain
 125  * @map: map a physically contiguous memory region to an iommu domain
 126  * @unmap: unmap a physically contiguous memory region from an iommu domain
 127  * @map_sg: map a scatter-gather list of physically contiguous memory chunks
 128  * to an iommu domain
 129  * @iova_to_phys: translate iova to physical address
 130  * @add_device: add device to iommu grouping
 131  * @remove_device: remove device from iommu grouping
 132  * @domain_get_attr: Query domain attributes
 133  * @domain_set_attr: Change domain attributes
 134  * @of_xlate: add OF master IDs to iommu grouping
 135  * @pgsize_bitmap: bitmap of supported page sizes
 136  * @priv: per-instance data private to the iommu driver
 137  */
 138 struct iommu_ops {
 139         bool (*capable)(enum iommu_cap);
 140
 141         /* Domain allocation and freeing by the iommu driver */
 142         struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
 143         void (*domain_free)(struct iommu_domain *);
 144
 145         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 146         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 147         int (*map)(struct iommu_domain *domain, unsigned long iova,
 148                    phys_addr_t paddr, size_t size, int prot);
 149         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 150                      size_t size);
 151         size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
 152                          struct scatterlist *sg, unsigned int nents, int prot);
 153         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 154         int (*add_device)(struct device *dev);
 155         void (*remove_device)(struct device *dev);
 156         int (*device_group)(struct device *dev, unsigned int *groupid);
 157         int (*domain_get_attr)(struct iommu_domain *domain,
 158                                enum iommu_attr attr, void *data);
 159         int (*domain_set_attr)(struct iommu_domain *domain,
 160                                enum iommu_attr attr, void *data);
 161
 162         /* Window handling functions */
 163         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 164                                     phys_addr_t paddr, u64 size, int prot);
 165         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 166         /* Set the numer of window per domain */
 167         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 168         /* Get the numer of window per domain */
 169         u32 (*domain_get_windows)(struct iommu_domain *domain);
 170
 171 #ifdef CONFIG_OF_IOMMU
 172         int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 173 #endif
 174
 175         unsigned long pgsize_bitmap;
 176         void *priv;
 177 };
 178
 179 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 180 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 181 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 182 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 183 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 184 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 185
 186 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 187 extern bool iommu_present(struct bus_type *bus);
 188 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 189 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 190 extern struct iommu_group *iommu_group_get_by_id(int id);
 191 extern void iommu_domain_free(struct iommu_domain *domain);
 192 extern int iommu_attach_device(struct iommu_domain *domain,
 193                                struct device *dev);
 194 extern void iommu_detach_device(struct iommu_domain *domain,
 195                                 struct device *dev);
 196 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 197                      phys_addr_t paddr, size_t size, int prot);
 198 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 199                        size_t size);
 200 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 201                                 struct scatterlist *sg,unsigned int nents,
 202                                 int prot);
 203 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 204 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 205                         iommu_fault_handler_t handler, void *token);
 206
 207 extern int iommu_attach_group(struct iommu_domain *domain,
 208                               struct iommu_group *group);
 209 extern void iommu_detach_group(struct iommu_domain *domain,
 210                                struct iommu_group *group);
 211 extern struct iommu_group *iommu_group_alloc(void);
 212 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 213 extern void iommu_group_set_iommudata(struct iommu_group *group,
 214                                       void *iommu_data,
 215                                       void (*release)(void *iommu_data));
 216 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 217 extern int iommu_group_add_device(struct iommu_group *group,
 218                                   struct device *dev);
 219 extern void iommu_group_remove_device(struct device *dev);
 220 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 221                                     int (*fn)(struct device *, void *));
 222 extern struct iommu_group *iommu_group_get(struct device *dev);
 223 extern void iommu_group_put(struct iommu_group *group);
 224 extern int iommu_group_register_notifier(struct iommu_group *group,
 225                                          struct notifier_block *nb);
 226 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 227                                            struct notifier_block *nb);
 228 extern int iommu_group_id(struct iommu_group *group);
 229 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 230
 231 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 232                                  void *data);
 233 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 234                                  void *data);
 235 struct device *iommu_device_create(struct device *parent, void *drvdata,
 236                                    const struct attribute_group **groups,
 237                                    const char *fmt, ...);
 238 void iommu_device_destroy(struct device *dev);
 239 int iommu_device_link(struct device *dev, struct device *link);
 240 void iommu_device_unlink(struct device *dev, struct device *link);
 241
 242 /* Window handling function prototypes */
 243 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 244                                       phys_addr_t offset, u64 size,
 245                                       int prot);
 246 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 247 /**
 248  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
 249  * @domain: the iommu domain where the fault has happened
 250  * @dev: the device where the fault has happened
 251  * @iova: the faulting address
 252  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
 253  *
 254  * This function should be called by the low-level IOMMU implementations
 255  * whenever IOMMU faults happen, to allow high-level users, that are
 256  * interested in such events, to know about them.
 257  *
 258  * This event may be useful for several possible use cases:
 259  * - mere logging of the event
 260  * - dynamic TLB/PTE loading
 261  * - if restarting of the faulting device is required
 262  *
 263  * Returns 0 on success and an appropriate error code otherwise (if dynamic
 264  * PTE/TLB loading will one day be supported, implementations will be able
 265  * to tell whether it succeeded or not according to this return value).
 266  *
 267  * Specifically, -ENOSYS is returned if a fault handler isn't installed
 268  * (though fault handlers can also return -ENOSYS, in case they want to
 269  * elicit the default behavior of the IOMMU drivers).
 270  */
 271 static inline int report_iommu_fault(struct iommu_domain *domain,
 272                 struct device *dev, unsigned long iova, int flags)
 273 {
 274         int ret = -ENOSYS;
 275
 276         /*
 277          * if upper layers showed interest and installed a fault handler,
 278          * invoke it.
 279          */
 280         if (domain->handler)
 281                 ret = domain->handler(domain, dev, iova, flags,
 282                                                 domain->handler_token);
 283
 284         trace_io_page_fault(dev, iova, flags);
 285         return ret;
 286 }
 287
 288 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 289                                   unsigned long iova, struct scatterlist *sg,
 290                                   unsigned int nents, int prot)
 291 {
 292         return domain->ops->map_sg(domain, iova, sg, nents, prot);
 293 }
 294
 295 #else /* CONFIG_IOMMU_API */
 296
 297 struct iommu_ops {};
 298 struct iommu_group {};
 299
 300 static inline bool iommu_present(struct bus_type *bus)
 301 {
 302         return false;
 303 }
 304
 305 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 306 {
 307         return false;
 308 }
 309
 310 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 311 {
 312         return NULL;
 313 }
 314
 315 static inline struct iommu_group *iommu_group_get_by_id(int id)
 316 {
 317         return NULL;
 318 }
 319
 320 static inline void iommu_domain_free(struct iommu_domain *domain)
 321 {
 322 }
 323
 324 static inline int iommu_attach_device(struct iommu_domain *domain,
 325                                       struct device *dev)
 326 {
 327         return -ENODEV;
 328 }
 329
 330 static inline void iommu_detach_device(struct iommu_domain *domain,
 331                                        struct device *dev)
 332 {
 333 }
 334
 335 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 336                             phys_addr_t paddr, int gfp_order, int prot)
 337 {
 338         return -ENODEV;
 339 }
 340
 341 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 342                               int gfp_order)
 343 {
 344         return -ENODEV;
 345 }
 346
 347 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 348                                   unsigned long iova, struct scatterlist *sg,
 349                                   unsigned int nents, int prot)
 350 {
 351         return -ENODEV;
 352 }
 353
 354 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 355                                              u32 wnd_nr, phys_addr_t paddr,
 356                                              u64 size, int prot)
 357 {
 358         return -ENODEV;
 359 }
 360
 361 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 362                                                u32 wnd_nr)
 363 {
 364 }
 365
 366 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 367 {
 368         return 0;
 369 }
 370
 371 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 372                                 iommu_fault_handler_t handler, void *token)
 373 {
 374 }
 375
 376 static inline int iommu_attach_group(struct iommu_domain *domain,
 377                                      struct iommu_group *group)
 378 {
 379         return -ENODEV;
 380 }
 381
 382 static inline void iommu_detach_group(struct iommu_domain *domain,
 383                                       struct iommu_group *group)
 384 {
 385 }
 386
 387 static inline struct iommu_group *iommu_group_alloc(void)
 388 {
 389         return ERR_PTR(-ENODEV);
 390 }
 391
 392 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 393 {
 394         return NULL;
 395 }
 396
 397 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 398                                              void *iommu_data,
 399                                              void (*release)(void *iommu_data))
 400 {
 401 }
 402
 403 static inline int iommu_group_set_name(struct iommu_group *group,
 404                                        const char *name)
 405 {
 406         return -ENODEV;
 407 }
 408
 409 static inline int iommu_group_add_device(struct iommu_group *group,
 410                                          struct device *dev)
 411 {
 412         return -ENODEV;
 413 }
 414
 415 static inline void iommu_group_remove_device(struct device *dev)
 416 {
 417 }
 418
 419 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 420                                            void *data,
 421                                            int (*fn)(struct device *, void *))
 422 {
 423         return -ENODEV;
 424 }
 425
 426 static inline struct iommu_group *iommu_group_get(struct device *dev)
 427 {
 428         return NULL;
 429 }
 430
 431 static inline void iommu_group_put(struct iommu_group *group)
 432 {
 433 }
 434
 435 static inline int iommu_group_register_notifier(struct iommu_group *group,
 436                                                 struct notifier_block *nb)
 437 {
 438         return -ENODEV;
 439 }
 440
 441 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 442                                                   struct notifier_block *nb)
 443 {
 444         return 0;
 445 }
 446
 447 static inline int iommu_group_id(struct iommu_group *group)
 448 {
 449         return -ENODEV;
 450 }
 451
 452 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 453                                         enum iommu_attr attr, void *data)
 454 {
 455         return -EINVAL;
 456 }
 457
 458 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 459                                         enum iommu_attr attr, void *data)
 460 {
 461         return -EINVAL;
 462 }
 463
 464 static inline struct device *iommu_device_create(struct device *parent,
 465                                         void *drvdata,
 466                                         const struct attribute_group **groups,
 467                                         const char *fmt, ...)
 468 {
 469         return ERR_PTR(-ENODEV);
 470 }
 471
 472 static inline void iommu_device_destroy(struct device *dev)
 473 {
 474 }
 475
 476 static inline int iommu_device_link(struct device *dev, struct device *link)
 477 {
 478         return -EINVAL;
 479 }
 480
 481 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 482 {
 483 }
 484
 485 #endif /* CONFIG_IOMMU_API */
 486
 487 #endif /* __LINUX_IOMMU_H */