59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/*
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* Copyright (c) 2006, Intel Corporation.
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*
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* This file is released under the GPLv2.
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*
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* Copyright (C) 2006-2008 Intel Corporation
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* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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*
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*/
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#ifndef _IOVA_H_
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#define _IOVA_H_
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/rbtree.h>
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#include <linux/dma-mapping.h>
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/* IO virtual address start page frame number */
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#define IOVA_START_PFN (1)
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/* iova structure */
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struct iova {
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struct rb_node node;
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unsigned long pfn_hi; /* IOMMU dish out addr hi */
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unsigned long pfn_lo; /* IOMMU dish out addr lo */
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};
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/* holds all the iova translations for a domain */
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struct iova_domain {
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spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
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struct rb_root rbroot; /* iova domain rbtree root */
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struct rb_node *cached32_node; /* Save last alloced node */
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unsigned long dma_32bit_pfn;
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};
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static inline unsigned long iova_size(struct iova *iova)
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{
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return iova->pfn_hi - iova->pfn_lo + 1;
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}
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struct iova *alloc_iova_mem(void);
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void free_iova_mem(struct iova *iova);
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void free_iova(struct iova_domain *iovad, unsigned long pfn);
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void __free_iova(struct iova_domain *iovad, struct iova *iova);
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struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
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unsigned long limit_pfn,
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bool size_aligned);
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struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
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unsigned long pfn_hi);
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void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
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void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
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struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
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void put_iova_domain(struct iova_domain *iovad);
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struct iova *split_and_remove_iova(struct iova_domain *iovad,
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struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
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#endif
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