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 #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 */ 129