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/types.h>
  25 #include <linux/scatterlist.h>
  26 #include <trace/events/iommu.h>
  27
  28 #define IOMMU_READ      (1 << 0)
  29 #define IOMMU_WRITE     (1 << 1)
  30 #define IOMMU_CACHE     (1 << 2) /* DMA cache coherency */
  31 #define IOMMU_EXEC      (1 << 3)
  32
  33 struct iommu_ops;
  34 struct iommu_group;
  35 struct bus_type;
  36 struct device;
  37 struct iommu_domain;
  38 struct notifier_block;
  39
  40 /* iommu fault flags */
  41 #define IOMMU_FAULT_READ        0x0
  42 #define IOMMU_FAULT_WRITE       0x1
  43
  44 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  45                         struct device *, unsigned long, int, void *);
  46
  47 struct iommu_domain_geometry {
  48         dma_addr_t aperture_start; /* First address that can be mapped    */
  49         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  50         bool force_aperture;       /* DMA only allowed in mappable range? */
  51 };
  52
  53 struct iommu_domain {
  54         const struct iommu_ops *ops;
  55         void *priv;
  56         iommu_fault_handler_t handler;
  57         void *handler_token;
  58         struct iommu_domain_geometry geometry;
  59 };
  60
  61 enum iommu_cap {
  62         IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
  63                                            transactions */
  64         IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
  65 };
  66
  67 /*
  68  * Following constraints are specifc to FSL_PAMUV1:
  69  *  -aperture must be power of 2, and naturally aligned
  70  *  -number of windows must be power of 2, and address space size
  71  *   of each window is determined by aperture size / # of windows
  72  *  -the actual size of the mapped region of a window must be power
  73  *   of 2 starting with 4KB and physical address must be naturally
  74  *   aligned.
  75  * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
  76  * The caller can invoke iommu_domain_get_attr to check if the underlying
  77  * iommu implementation supports these constraints.
  78  */
  79
  80 enum iommu_attr {
  81         DOMAIN_ATTR_GEOMETRY,
  82         DOMAIN_ATTR_PAGING,
  83         DOMAIN_ATTR_WINDOWS,
  84         DOMAIN_ATTR_FSL_PAMU_STASH,
  85         DOMAIN_ATTR_FSL_PAMU_ENABLE,
  86         DOMAIN_ATTR_FSL_PAMUV1,
  87         DOMAIN_ATTR_NESTING,    /* two stages of translation */
  88         DOMAIN_ATTR_MAX,
  89 };
  90
  91 #ifdef CONFIG_IOMMU_API
  92
  93 /**
  94  * struct iommu_ops - iommu ops and capabilities
  95  * @domain_init: init iommu domain
  96  * @domain_destroy: destroy iommu domain
  97  * @attach_dev: attach device to an iommu domain
  98  * @detach_dev: detach device from an iommu domain
  99  * @map: map a physically contiguous memory region to an iommu domain
 100  * @unmap: unmap a physically contiguous memory region from an iommu domain
 101  * @map_sg: map a scatter-gather list of physically contiguous memory chunks
 102  * to an iommu domain
 103  * @iova_to_phys: translate iova to physical address
 104  * @add_device: add device to iommu grouping
 105  * @remove_device: remove device from iommu grouping
 106  * @domain_get_attr: Query domain attributes
 107  * @domain_set_attr: Change domain attributes
 108  * @pgsize_bitmap: bitmap of supported page sizes
 109  */
 110 struct iommu_ops {
 111         bool (*capable)(enum iommu_cap);
 112         int (*domain_init)(struct iommu_domain *domain);
 113         void (*domain_destroy)(struct iommu_domain *domain);
 114         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 115         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 116         int (*map)(struct iommu_domain *domain, unsigned long iova,
 117                    phys_addr_t paddr, size_t size, int prot);
 118         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 119                      size_t size);
 120         size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
 121                          struct scatterlist *sg, unsigned int nents, int prot);
 122         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 123         int (*add_device)(struct device *dev);
 124         void (*remove_device)(struct device *dev);
 125         int (*device_group)(struct device *dev, unsigned int *groupid);
 126         int (*domain_get_attr)(struct iommu_domain *domain,
 127                                enum iommu_attr attr, void *data);
 128         int (*domain_set_attr)(struct iommu_domain *domain,
 129                                enum iommu_attr attr, void *data);
 130
 131         /* Window handling functions */
 132         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
 133                                     phys_addr_t paddr, u64 size, int prot);
 134         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 135         /* Set the numer of window per domain */
 136         int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
 137         /* Get the numer of window per domain */
 138         u32 (*domain_get_windows)(struct iommu_domain *domain);
 139
 140         unsigned long pgsize_bitmap;
 141 };
 142
 143 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 144 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 145 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 146 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 147 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 148 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 149
 150 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 151 extern bool iommu_present(struct bus_type *bus);
 152 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 153 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 154 extern struct iommu_group *iommu_group_get_by_id(int id);
 155 extern void iommu_domain_free(struct iommu_domain *domain);
 156 extern int iommu_attach_device(struct iommu_domain *domain,
 157                                struct device *dev);
 158 extern void iommu_detach_device(struct iommu_domain *domain,
 159                                 struct device *dev);
 160 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 161                      phys_addr_t paddr, size_t size, int prot);
 162 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 163                        size_t size);
 164 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 165                                 struct scatterlist *sg,unsigned int nents,
 166                                 int prot);
 167 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 168 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 169                         iommu_fault_handler_t handler, void *token);
 170
 171 extern int iommu_attach_group(struct iommu_domain *domain,
 172                               struct iommu_group *group);
 173 extern void iommu_detach_group(struct iommu_domain *domain,
 174                                struct iommu_group *group);
 175 extern struct iommu_group *iommu_group_alloc(void);
 176 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 177 extern void iommu_group_set_iommudata(struct iommu_group *group,
 178                                       void *iommu_data,
 179                                       void (*release)(void *iommu_data));
 180 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 181 extern int iommu_group_add_device(struct iommu_group *group,
 182                                   struct device *dev);
 183 extern void iommu_group_remove_device(struct device *dev);
 184 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 185                                     int (*fn)(struct device *, void *));
 186 extern struct iommu_group *iommu_group_get(struct device *dev);
 187 extern void iommu_group_put(struct iommu_group *group);
 188 extern int iommu_group_register_notifier(struct iommu_group *group,
 189                                          struct notifier_block *nb);
 190 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 191                                            struct notifier_block *nb);
 192 extern int iommu_group_id(struct iommu_group *group);
 193 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 194
 195 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 196                                  void *data);
 197 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 198                                  void *data);
 199 struct device *iommu_device_create(struct device *parent, void *drvdata,
 200                                    const struct attribute_group **groups,
 201                                    const char *fmt, ...);
 202 void iommu_device_destroy(struct device *dev);
 203 int iommu_device_link(struct device *dev, struct device *link);
 204 void iommu_device_unlink(struct device *dev, struct device *link);
 205
 206 /* Window handling function prototypes */
 207 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 208                                       phys_addr_t offset, u64 size,
 209                                       int prot);
 210 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 211 /**
 212  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
 213  * @domain: the iommu domain where the fault has happened
 214  * @dev: the device where the fault has happened
 215  * @iova: the faulting address
 216  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
 217  *
 218  * This function should be called by the low-level IOMMU implementations
 219  * whenever IOMMU faults happen, to allow high-level users, that are
 220  * interested in such events, to know about them.
 221  *
 222  * This event may be useful for several possible use cases:
 223  * - mere logging of the event
 224  * - dynamic TLB/PTE loading
 225  * - if restarting of the faulting device is required
 226  *
 227  * Returns 0 on success and an appropriate error code otherwise (if dynamic
 228  * PTE/TLB loading will one day be supported, implementations will be able
 229  * to tell whether it succeeded or not according to this return value).
 230  *
 231  * Specifically, -ENOSYS is returned if a fault handler isn't installed
 232  * (though fault handlers can also return -ENOSYS, in case they want to
 233  * elicit the default behavior of the IOMMU drivers).
 234  */
 235 static inline int report_iommu_fault(struct iommu_domain *domain,
 236                 struct device *dev, unsigned long iova, int flags)
 237 {
 238         int ret = -ENOSYS;
 239
 240         /*
 241          * if upper layers showed interest and installed a fault handler,
 242          * invoke it.
 243          */
 244         if (domain->handler)
 245                 ret = domain->handler(domain, dev, iova, flags,
 246                                                 domain->handler_token);
 247
 248         trace_io_page_fault(dev, iova, flags);
 249         return ret;
 250 }
 251
 252 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 253                                   unsigned long iova, struct scatterlist *sg,
 254                                   unsigned int nents, int prot)
 255 {
 256         return domain->ops->map_sg(domain, iova, sg, nents, prot);
 257 }
 258
 259 #else /* CONFIG_IOMMU_API */
 260
 261 struct iommu_ops {};
 262 struct iommu_group {};
 263
 264 static inline bool iommu_present(struct bus_type *bus)
 265 {
 266         return false;
 267 }
 268
 269 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
 270 {
 271         return false;
 272 }
 273
 274 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 275 {
 276         return NULL;
 277 }
 278
 279 static inline struct iommu_group *iommu_group_get_by_id(int id)
 280 {
 281         return NULL;
 282 }
 283
 284 static inline void iommu_domain_free(struct iommu_domain *domain)
 285 {
 286 }
 287
 288 static inline int iommu_attach_device(struct iommu_domain *domain,
 289                                       struct device *dev)
 290 {
 291         return -ENODEV;
 292 }
 293
 294 static inline void iommu_detach_device(struct iommu_domain *domain,
 295                                        struct device *dev)
 296 {
 297 }
 298
 299 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 300                             phys_addr_t paddr, int gfp_order, int prot)
 301 {
 302         return -ENODEV;
 303 }
 304
 305 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 306                               int gfp_order)
 307 {
 308         return -ENODEV;
 309 }
 310
 311 static inline size_t iommu_map_sg(struct iommu_domain *domain,
 312                                   unsigned long iova, struct scatterlist *sg,
 313                                   unsigned int nents, int prot)
 314 {
 315         return -ENODEV;
 316 }
 317
 318 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 319                                              u32 wnd_nr, phys_addr_t paddr,
 320                                              u64 size, int prot)
 321 {
 322         return -ENODEV;
 323 }
 324
 325 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
 326                                                u32 wnd_nr)
 327 {
 328 }
 329
 330 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 331 {
 332         return 0;
 333 }
 334
 335 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 336                                 iommu_fault_handler_t handler, void *token)
 337 {
 338 }
 339
 340 static inline int iommu_attach_group(struct iommu_domain *domain,
 341                                      struct iommu_group *group)
 342 {
 343         return -ENODEV;
 344 }
 345
 346 static inline void iommu_detach_group(struct iommu_domain *domain,
 347                                       struct iommu_group *group)
 348 {
 349 }
 350
 351 static inline struct iommu_group *iommu_group_alloc(void)
 352 {
 353         return ERR_PTR(-ENODEV);
 354 }
 355
 356 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 357 {
 358         return NULL;
 359 }
 360
 361 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 362                                              void *iommu_data,
 363                                              void (*release)(void *iommu_data))
 364 {
 365 }
 366
 367 static inline int iommu_group_set_name(struct iommu_group *group,
 368                                        const char *name)
 369 {
 370         return -ENODEV;
 371 }
 372
 373 static inline int iommu_group_add_device(struct iommu_group *group,
 374                                          struct device *dev)
 375 {
 376         return -ENODEV;
 377 }
 378
 379 static inline void iommu_group_remove_device(struct device *dev)
 380 {
 381 }
 382
 383 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 384                                            void *data,
 385                                            int (*fn)(struct device *, void *))
 386 {
 387         return -ENODEV;
 388 }
 389
 390 static inline struct iommu_group *iommu_group_get(struct device *dev)
 391 {
 392         return NULL;
 393 }
 394
 395 static inline void iommu_group_put(struct iommu_group *group)
 396 {
 397 }
 398
 399 static inline int iommu_group_register_notifier(struct iommu_group *group,
 400                                                 struct notifier_block *nb)
 401 {
 402         return -ENODEV;
 403 }
 404
 405 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 406                                                   struct notifier_block *nb)
 407 {
 408         return 0;
 409 }
 410
 411 static inline int iommu_group_id(struct iommu_group *group)
 412 {
 413         return -ENODEV;
 414 }
 415
 416 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 417                                         enum iommu_attr attr, void *data)
 418 {
 419         return -EINVAL;
 420 }
 421
 422 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 423                                         enum iommu_attr attr, void *data)
 424 {
 425         return -EINVAL;
 426 }
 427
 428 static inline struct device *iommu_device_create(struct device *parent,
 429                                         void *drvdata,
 430                                         const struct attribute_group **groups,
 431                                         const char *fmt, ...)
 432 {
 433         return ERR_PTR(-ENODEV);
 434 }
 435
 436 static inline void iommu_device_destroy(struct device *dev)
 437 {
 438 }
 439
 440 static inline int iommu_device_link(struct device *dev, struct device *link)
 441 {
 442         return -EINVAL;
 443 }
 444
 445 static inline void iommu_device_unlink(struct device *dev, struct device *link)
 446 {
 447 }
 448
 449 #endif /* CONFIG_IOMMU_API */
 450
 451 #endif /* __LINUX_IOMMU_H */