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 #define IOMMU_CACHE     (4) /* DMA cache coherency */
  25
  26 struct device;
  27
  28 struct iommu_domain {
  29         void *priv;
  30 };
  31
  32 #define IOMMU_CAP_CACHE_COHERENCY       0x1
  33
  34 struct iommu_ops {
  35         int (*domain_init)(struct iommu_domain *domain);
  36         void (*domain_destroy)(struct iommu_domain *domain);
  37         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
  38         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
  39         int (*map)(struct iommu_domain *domain, unsigned long iova,
  40                    phys_addr_t paddr, size_t size, int prot);
  41         void (*unmap)(struct iommu_domain *domain, unsigned long iova,
  42                       size_t size);
  43         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
  44                                     unsigned long iova);
  45         int (*domain_has_cap)(struct iommu_domain *domain,
  46                               unsigned long cap);
  47 };
  48
  49 #ifdef CONFIG_IOMMU_API
  50
  51 extern void register_iommu(struct iommu_ops *ops);
  52 extern bool iommu_found(void);
  53 extern struct iommu_domain *iommu_domain_alloc(void);
  54 extern void iommu_domain_free(struct iommu_domain *domain);
  55 extern int iommu_attach_device(struct iommu_domain *domain,
  56                                struct device *dev);
  57 extern void iommu_detach_device(struct iommu_domain *domain,
  58                                 struct device *dev);
  59 extern int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
  60                            phys_addr_t paddr, size_t size, int prot);
  61 extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
  62                               size_t size);
  63 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
  64                                       unsigned long iova);
  65 extern int iommu_domain_has_cap(struct iommu_domain *domain,
  66                                 unsigned long cap);
  67
  68 #else /* CONFIG_IOMMU_API */
  69
  70 static inline void register_iommu(struct iommu_ops *ops)
  71 {
  72 }
  73
  74 static inline bool iommu_found(void)
  75 {
  76         return false;
  77 }
  78
  79 static inline struct iommu_domain *iommu_domain_alloc(void)
  80 {
  81         return NULL;
  82 }
  83
  84 static inline void iommu_domain_free(struct iommu_domain *domain)
  85 {
  86 }
  87
  88 static inline int iommu_attach_device(struct iommu_domain *domain,
  89                                       struct device *dev)
  90 {
  91         return -ENODEV;
  92 }
  93
  94 static inline void iommu_detach_device(struct iommu_domain *domain,
  95                                        struct device *dev)
  96 {
  97 }
  98
  99 static inline int iommu_map_range(struct iommu_domain *domain,
 100                                   unsigned long iova, phys_addr_t paddr,
 101                                   size_t size, int prot)
 102 {
 103         return -ENODEV;
 104 }
 105
 106 static inline void iommu_unmap_range(struct iommu_domain *domain,
 107                                      unsigned long iova, size_t size)
 108 {
 109 }
 110
 111 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 112                                              unsigned long iova)
 113 {
 114         return 0;
 115 }
 116
 117 static inline int domain_has_cap(struct iommu_domain *domain,
 118                                  unsigned long cap)
 119 {
 120         return 0;
 121 }
 122
 123 #endif /* CONFIG_IOMMU_API */
 124
 125 #endif /* __LINUX_IOMMU_H */