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
  24 #define IOMMU_READ      (1)
  25 #define IOMMU_WRITE     (2)
  26 #define IOMMU_CACHE     (4) /* DMA cache coherency */
  27
  28 struct device;
  29
  30 struct iommu_domain {
  31         void *priv;
  32 };
  33
  34 #define IOMMU_CAP_CACHE_COHERENCY       0x1
  35 #define IOMMU_CAP_INTR_REMAP            0x2     /* isolates device intrs */
  36
  37 struct iommu_ops {
  38         int (*domain_init)(struct iommu_domain *domain);
  39         void (*domain_destroy)(struct iommu_domain *domain);
  40         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
  41         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
  42         int (*map)(struct iommu_domain *domain, unsigned long iova,
  43                    phys_addr_t paddr, int gfp_order, int prot);
  44         int (*unmap)(struct iommu_domain *domain, unsigned long iova,
  45                      int gfp_order);
  46         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
  47                                     unsigned long iova);
  48         int (*domain_has_cap)(struct iommu_domain *domain,
  49                               unsigned long cap);
  50 };
  51
  52 #ifdef CONFIG_IOMMU_API
  53
  54 extern void register_iommu(struct iommu_ops *ops);
  55 extern bool iommu_found(void);
  56 extern struct iommu_domain *iommu_domain_alloc(void);
  57 extern void iommu_domain_free(struct iommu_domain *domain);
  58 extern int iommu_attach_device(struct iommu_domain *domain,
  59                                struct device *dev);
  60 extern void iommu_detach_device(struct iommu_domain *domain,
  61                                 struct device *dev);
  62 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
  63                      phys_addr_t paddr, int gfp_order, int prot);
  64 extern int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
  65                        int gfp_order);
  66 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
  67                                       unsigned long iova);
  68 extern int iommu_domain_has_cap(struct iommu_domain *domain,
  69                                 unsigned long cap);
  70
  71 #else /* CONFIG_IOMMU_API */
  72
  73 static inline void register_iommu(struct iommu_ops *ops)
  74 {
  75 }
  76
  77 static inline bool iommu_found(void)
  78 {
  79         return false;
  80 }
  81
  82 static inline struct iommu_domain *iommu_domain_alloc(void)
  83 {
  84         return NULL;
  85 }
  86
  87 static inline void iommu_domain_free(struct iommu_domain *domain)
  88 {
  89 }
  90
  91 static inline int iommu_attach_device(struct iommu_domain *domain,
  92                                       struct device *dev)
  93 {
  94         return -ENODEV;
  95 }
  96
  97 static inline void iommu_detach_device(struct iommu_domain *domain,
  98                                        struct device *dev)
  99 {
 100 }
 101
 102 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 103                             phys_addr_t paddr, int gfp_order, int prot)
 104 {
 105         return -ENODEV;
 106 }
 107
 108 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 109                               int gfp_order)
 110 {
 111         return -ENODEV;
 112 }
 113
 114 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 115                                              unsigned long iova)
 116 {
 117         return 0;
 118 }
 119
 120 static inline int domain_has_cap(struct iommu_domain *domain,
 121                                  unsigned long cap)
 122 {
 123         return 0;
 124 }
 125
 126 #endif /* CONFIG_IOMMU_API */
 127
 128 #endif /* __LINUX_IOMMU_H */