1 /* 2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. 3 * Author: Joerg Roedel <[email protected]> 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 */ 113