1 /* 2 * Copyright (c) 2006, Intel Corporation. 3 * 4 * This file is released under the GPLv2. 5 * 6 * Copyright (C) 2006-2008 Intel Corporation 7 * Author: Anil S Keshavamurthy <[email protected]> 8 * 9 */ 10 11 #ifndef _IOVA_H_ 12 #define _IOVA_H_ 13 14 #include <linux/types.h> 15 #include <linux/kernel.h> 16 #include <linux/rbtree.h> 17 #include <linux/dma-mapping.h> 18 19 /* IO virtual address start page frame number */ 20 #define IOVA_START_PFN (1) 21 22 /* iova structure */ 23 struct iova { 24 struct rb_node node; 25 unsigned long pfn_hi; /* IOMMU dish out addr hi */ 26 unsigned long pfn_lo; /* IOMMU dish out addr lo */ 27 }; 28 29 /* holds all the iova translations for a domain */ 30 struct iova_domain { 31 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ 32 struct rb_root rbroot; /* iova domain rbtree root */ 33 struct rb_node *cached32_node; /* Save last alloced node */ 34 unsigned long dma_32bit_pfn; 35 }; 36 37 static inline unsigned long iova_size(struct iova *iova) 38 { 39 return iova->pfn_hi - iova->pfn_lo + 1; 40 } 41 42 struct iova *alloc_iova_mem(void); 43 void free_iova_mem(struct iova *iova); 44 void free_iova(struct iova_domain *iovad, unsigned long pfn); 45 void __free_iova(struct iova_domain *iovad, struct iova *iova); 46 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, 47 unsigned long limit_pfn, 48 bool size_aligned); 49 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, 50 unsigned long pfn_hi); 51 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); 52 void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit); 53 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); 54 void put_iova_domain(struct iova_domain *iovad); 55 struct iova *split_and_remove_iova(struct iova_domain *iovad, 56 struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi); 57 58 #endif 59