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/types.h>
  24
  25 #define IOMMU_READ      (1)
  26 #define IOMMU_WRITE     (2)
  27 #define IOMMU_CACHE     (4) /* DMA cache coherency */
  28
  29 struct iommu_ops;
  30 struct iommu_group;
  31 struct bus_type;
  32 struct device;
  33 struct iommu_domain;
  34 struct notifier_block;
  35
  36 /* iommu fault flags */
  37 #define IOMMU_FAULT_READ        0x0
  38 #define IOMMU_FAULT_WRITE       0x1
  39
  40 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  41                         struct device *, unsigned long, int, void *);
  42
  43 struct iommu_domain_geometry {
  44         dma_addr_t aperture_start; /* First address that can be mapped    */
  45         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  46         bool force_aperture;       /* DMA only allowed in mappable range? */
  47 };
  48
  49 struct iommu_domain {
  50         struct iommu_ops *ops;
  51         void *priv;
  52         iommu_fault_handler_t handler;
  53         void *handler_token;
  54         struct iommu_domain_geometry geometry;
  55 };
  56
  57 #define IOMMU_CAP_CACHE_COHERENCY       0x1
  58 #define IOMMU_CAP_INTR_REMAP            0x2     /* isolates device intrs */
  59
  60 enum iommu_attr {
  61         DOMAIN_ATTR_MAX,
  62         DOMAIN_ATTR_GEOMETRY,
  63 };
  64
  65 #ifdef CONFIG_IOMMU_API
  66
  67 /**
  68  * struct iommu_ops - iommu ops and capabilities
  69  * @domain_init: init iommu domain
  70  * @domain_destroy: destroy iommu domain
  71  * @attach_dev: attach device to an iommu domain
  72  * @detach_dev: detach device from an iommu domain
  73  * @map: map a physically contiguous memory region to an iommu domain
  74  * @unmap: unmap a physically contiguous memory region from an iommu domain
  75  * @iova_to_phys: translate iova to physical address
  76  * @domain_has_cap: domain capabilities query
  77  * @add_device: add device to iommu grouping
  78  * @remove_device: remove device from iommu grouping
  79  * @domain_get_attr: Query domain attributes
  80  * @domain_set_attr: Change domain attributes
  81  * @pgsize_bitmap: bitmap of supported page sizes
  82  */
  83 struct iommu_ops {
  84         int (*domain_init)(struct iommu_domain *domain);
  85         void (*domain_destroy)(struct iommu_domain *domain);
  86         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
  87         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
  88         int (*map)(struct iommu_domain *domain, unsigned long iova,
  89                    phys_addr_t paddr, size_t size, int prot);
  90         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
  91                      size_t size);
  92         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
  93                                     unsigned long iova);
  94         int (*domain_has_cap)(struct iommu_domain *domain,
  95                               unsigned long cap);
  96         int (*add_device)(struct device *dev);
  97         void (*remove_device)(struct device *dev);
  98         int (*device_group)(struct device *dev, unsigned int *groupid);
  99         int (*domain_get_attr)(struct iommu_domain *domain,
 100                                enum iommu_attr attr, void *data);
 101         int (*domain_set_attr)(struct iommu_domain *domain,
 102                                enum iommu_attr attr, void *data);
 103         unsigned long pgsize_bitmap;
 104 };
 105
 106 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 107 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 108 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 109 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 110 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 111 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 112
 113 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
 114 extern bool iommu_present(struct bus_type *bus);
 115 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 116 extern void iommu_domain_free(struct iommu_domain *domain);
 117 extern int iommu_attach_device(struct iommu_domain *domain,
 118                                struct device *dev);
 119 extern void iommu_detach_device(struct iommu_domain *domain,
 120                                 struct device *dev);
 121 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 122                      phys_addr_t paddr, size_t size, int prot);
 123 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 124                        size_t size);
 125 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 126                                       unsigned long iova);
 127 extern int iommu_domain_has_cap(struct iommu_domain *domain,
 128                                 unsigned long cap);
 129 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 130                         iommu_fault_handler_t handler, void *token);
 131
 132 extern int iommu_attach_group(struct iommu_domain *domain,
 133                               struct iommu_group *group);
 134 extern void iommu_detach_group(struct iommu_domain *domain,
 135                                struct iommu_group *group);
 136 extern struct iommu_group *iommu_group_alloc(void);
 137 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 138 extern void iommu_group_set_iommudata(struct iommu_group *group,
 139                                       void *iommu_data,
 140                                       void (*release)(void *iommu_data));
 141 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 142 extern int iommu_group_add_device(struct iommu_group *group,
 143                                   struct device *dev);
 144 extern void iommu_group_remove_device(struct device *dev);
 145 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 146                                     int (*fn)(struct device *, void *));
 147 extern struct iommu_group *iommu_group_get(struct device *dev);
 148 extern void iommu_group_put(struct iommu_group *group);
 149 extern int iommu_group_register_notifier(struct iommu_group *group,
 150                                          struct notifier_block *nb);
 151 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 152                                            struct notifier_block *nb);
 153 extern int iommu_group_id(struct iommu_group *group);
 154
 155 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 156                                  void *data);
 157 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 158                                  void *data);
 159
 160 /**
 161  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
 162  * @domain: the iommu domain where the fault has happened
 163  * @dev: the device where the fault has happened
 164  * @iova: the faulting address
 165  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
 166  *
 167  * This function should be called by the low-level IOMMU implementations
 168  * whenever IOMMU faults happen, to allow high-level users, that are
 169  * interested in such events, to know about them.
 170  *
 171  * This event may be useful for several possible use cases:
 172  * - mere logging of the event
 173  * - dynamic TLB/PTE loading
 174  * - if restarting of the faulting device is required
 175  *
 176  * Returns 0 on success and an appropriate error code otherwise (if dynamic
 177  * PTE/TLB loading will one day be supported, implementations will be able
 178  * to tell whether it succeeded or not according to this return value).
 179  *
 180  * Specifically, -ENOSYS is returned if a fault handler isn't installed
 181  * (though fault handlers can also return -ENOSYS, in case they want to
 182  * elicit the default behavior of the IOMMU drivers).
 183  */
 184 static inline int report_iommu_fault(struct iommu_domain *domain,
 185                 struct device *dev, unsigned long iova, int flags)
 186 {
 187         int ret = -ENOSYS;
 188
 189         /*
 190          * if upper layers showed interest and installed a fault handler,
 191          * invoke it.
 192          */
 193         if (domain->handler)
 194                 ret = domain->handler(domain, dev, iova, flags,
 195                                                 domain->handler_token);
 196
 197         return ret;
 198 }
 199
 200 #else /* CONFIG_IOMMU_API */
 201
 202 struct iommu_ops {};
 203 struct iommu_group {};
 204
 205 static inline bool iommu_present(struct bus_type *bus)
 206 {
 207         return false;
 208 }
 209
 210 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 211 {
 212         return NULL;
 213 }
 214
 215 static inline void iommu_domain_free(struct iommu_domain *domain)
 216 {
 217 }
 218
 219 static inline int iommu_attach_device(struct iommu_domain *domain,
 220                                       struct device *dev)
 221 {
 222         return -ENODEV;
 223 }
 224
 225 static inline void iommu_detach_device(struct iommu_domain *domain,
 226                                        struct device *dev)
 227 {
 228 }
 229
 230 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 231                             phys_addr_t paddr, int gfp_order, int prot)
 232 {
 233         return -ENODEV;
 234 }
 235
 236 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 237                               int gfp_order)
 238 {
 239         return -ENODEV;
 240 }
 241
 242 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 243                                              unsigned long iova)
 244 {
 245         return 0;
 246 }
 247
 248 static inline int domain_has_cap(struct iommu_domain *domain,
 249                                  unsigned long cap)
 250 {
 251         return 0;
 252 }
 253
 254 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 255                                 iommu_fault_handler_t handler, void *token)
 256 {
 257 }
 258
 259 static inline int iommu_attach_group(struct iommu_domain *domain,
 260                                      struct iommu_group *group)
 261 {
 262         return -ENODEV;
 263 }
 264
 265 static inline void iommu_detach_group(struct iommu_domain *domain,
 266                                       struct iommu_group *group)
 267 {
 268 }
 269
 270 static inline struct iommu_group *iommu_group_alloc(void)
 271 {
 272         return ERR_PTR(-ENODEV);
 273 }
 274
 275 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
 276 {
 277         return NULL;
 278 }
 279
 280 static inline void iommu_group_set_iommudata(struct iommu_group *group,
 281                                              void *iommu_data,
 282                                              void (*release)(void *iommu_data))
 283 {
 284 }
 285
 286 static inline int iommu_group_set_name(struct iommu_group *group,
 287                                        const char *name)
 288 {
 289         return -ENODEV;
 290 }
 291
 292 static inline int iommu_group_add_device(struct iommu_group *group,
 293                                          struct device *dev)
 294 {
 295         return -ENODEV;
 296 }
 297
 298 static inline void iommu_group_remove_device(struct device *dev)
 299 {
 300 }
 301
 302 static inline int iommu_group_for_each_dev(struct iommu_group *group,
 303                                            void *data,
 304                                            int (*fn)(struct device *, void *))
 305 {
 306         return -ENODEV;
 307 }
 308
 309 static inline struct iommu_group *iommu_group_get(struct device *dev)
 310 {
 311         return NULL;
 312 }
 313
 314 static inline void iommu_group_put(struct iommu_group *group)
 315 {
 316 }
 317
 318 static inline int iommu_group_register_notifier(struct iommu_group *group,
 319                                                 struct notifier_block *nb)
 320 {
 321         return -ENODEV;
 322 }
 323
 324 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
 325                                                   struct notifier_block *nb)
 326 {
 327         return 0;
 328 }
 329
 330 static inline int iommu_group_id(struct iommu_group *group)
 331 {
 332         return -ENODEV;
 333 }
 334
 335 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 336                                         enum iommu_attr attr, void *data)
 337 {
 338         return -EINVAL;
 339 }
 340
 341 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 342                                         enum iommu_attr attr, void *data)
 343 {
 344         return -EINVAL;
 345 }
 346
 347 #endif /* CONFIG_IOMMU_API */
 348
 349 #endif /* __LINUX_IOMMU_H */