63 lines
1.9 KiB
C
63 lines
1.9 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 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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/*
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* We need a fixed PAGE_SIZE of 4K irrespective of
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* arch PAGE_SIZE for IOMMU page tables.
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*/
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#define PAGE_SHIFT_4K (12)
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#define PAGE_SIZE_4K (1UL << PAGE_SHIFT_4K)
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#define PAGE_MASK_4K (((u64)-1) << PAGE_SHIFT_4K)
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#define PAGE_ALIGN_4K(addr) (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
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/* IO virtual address start page frame number */
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#define IOVA_START_PFN (1)
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#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT_4K)
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#define DMA_32BIT_PFN IOVA_PFN(DMA_32BIT_MASK)
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#define DMA_64BIT_PFN IOVA_PFN(DMA_64BIT_MASK)
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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_alloc_lock;/* Lock to protect iova allocation */
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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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};
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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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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);
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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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#endif
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