iova.h

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/*
 * Copyright (c) 2006, Intel Corporation.
 *
 * This file is released under the GPLv2.
 *
 * Copyright (C) 2006-2008 Intel Corporation
 * Author: Anil S Keshavamurthy <[email protected]>
 *
 */

#ifndef _IOVA_H_
#define _IOVA_H_

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/rbtree.h>
#include <linux/dma-mapping.h>

/* IO virtual address start page frame number */
#define IOVA_START_PFN      (1)

/* iova structure */
struct iova {
    struct rb_node  node;
    unsigned long   pfn_hi; /* IOMMU dish out addr hi */
    unsigned long   pfn_lo; /* IOMMU dish out addr lo */
};

/* holds all the iova translations for a domain */
struct iova_domain {
    spinlock_t  iova_rbtree_lock; /* Lock to protect update of rbtree */
    struct rb_root  rbroot;     /* iova domain rbtree root */
    struct rb_node  *cached32_node; /* Save last alloced node */
    unsigned long   dma_32bit_pfn;
};

struct iova *alloc_iova_mem(void);
void free_iova_mem(struct iova *iova);
void free_iova(struct iova_domain *iovad, unsigned long pfn);
void __free_iova(struct iova_domain *iovad, struct iova *iova);
struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
    unsigned long limit_pfn,
    bool size_aligned);
struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
    unsigned long pfn_hi);
void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
void put_iova_domain(struct iova_domain *iovad);

#endif