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