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 #define IOMMU_READ      (1)
  23 #define IOMMU_WRITE     (2)
  24
  25 struct device;
  26
  27 struct iommu_domain {
  28         void *priv;
  29 };
  30
  31 struct iommu_ops {
  32         int (*domain_init)(struct iommu_domain *domain);
  33         void (*domain_destroy)(struct iommu_domain *domain);
  34         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
  35         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
  36         int (*map)(struct iommu_domain *domain, unsigned long iova,
  37                    phys_addr_t paddr, size_t size, int prot);
  38         void (*unmap)(struct iommu_domain *domain, unsigned long iova,
  39                       size_t size);
  40         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
  41                                     unsigned long iova);
  42 };
  43
  44 #ifdef CONFIG_IOMMU_API
  45
  46 extern void register_iommu(struct iommu_ops *ops);
  47 extern bool iommu_found(void);
  48 extern struct iommu_domain *iommu_domain_alloc(void);
  49 extern void iommu_domain_free(struct iommu_domain *domain);
  50 extern int iommu_attach_device(struct iommu_domain *domain,
  51                                struct device *dev);
  52 extern void iommu_detach_device(struct iommu_domain *domain,
  53                                 struct device *dev);
  54 extern int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
  55                            phys_addr_t paddr, size_t size, int prot);
  56 extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
  57                               size_t size);
  58 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
  59                                       unsigned long iova);
  60
  61 #else /* CONFIG_IOMMU_API */
  62
  63 static inline void register_iommu(struct iommu_ops *ops)
  64 {
  65 }
  66
  67 static inline bool iommu_found(void)
  68 {
  69         return false;
  70 }
  71
  72 static inline struct iommu_domain *iommu_domain_alloc(void)
  73 {
  74         return NULL;
  75 }
  76
  77 static inline void iommu_domain_free(struct iommu_domain *domain)
  78 {
  79 }
  80
  81 static inline int iommu_attach_device(struct iommu_domain *domain,
  82                                       struct device *dev)
  83 {
  84         return -ENODEV;
  85 }
  86
  87 static inline void iommu_detach_device(struct iommu_domain *domain,
  88                                        struct device *dev)
  89 {
  90 }
  91
  92 static inline int iommu_map_range(struct iommu_domain *domain,
  93                                   unsigned long iova, phys_addr_t paddr,
  94                                   size_t size, int prot)
  95 {
  96         return -ENODEV;
  97 }
  98
  99 static inline void iommu_unmap_range(struct iommu_domain *domain,
 100                                      unsigned long iova, size_t size)
 101 {
 102 }
 103
 104 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 105                                              unsigned long iova)
 106 {
 107         return 0;
 108 }
 109
 110 #endif /* CONFIG_IOMMU_API */
 111
 112 #endif /* __LINUX_IOMMU_H */