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 #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 */ 127