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