linux/include/linux/iova.h
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   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 <anil.s.keshavamurthy@intel.com>
   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 */
  23struct 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 */
  30struct 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
  37struct iova *alloc_iova_mem(void);
  38void free_iova_mem(struct iova *iova);
  39void free_iova(struct iova_domain *iovad, unsigned long pfn);
  40void __free_iova(struct iova_domain *iovad, struct iova *iova);
  41struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
  42        unsigned long limit_pfn,
  43        bool size_aligned);
  44struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
  45        unsigned long pfn_hi);
  46void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
  47void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
  48struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
  49void put_iova_domain(struct iova_domain *iovad);
  50
  51#endif
  52
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