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/*

 * Copyright (c) 2006, Intel Corporation.

 *

 * This file is released under the GPLv2.

 *

 * Copyright (C) 2006 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>

 *

 */

#ifndef _IOVA_H_

#define _IOVA_H_

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/rbtree.h>

#include <linux/dma-mapping.h>

/*

 * We need a fixed PAGE_SIZE of 4K irrespective of

 * arch PAGE_SIZE for IOMMU page tables.

 */

#define PAGE_SHIFT_4K           (12)

#define PAGE_SIZE_4K            (1UL << PAGE_SHIFT_4K)

#define PAGE_MASK_4K            (((u64)-1) << PAGE_SHIFT_4K)

#define PAGE_ALIGN_4K(addr)     (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)

/* IO virtual address start page frame number */

#define IOVA_START_PFN          (1)

#define IOVA_PFN(addr)          ((addr) >> PAGE_SHIFT_4K)

#define DMA_32BIT_PFN   IOVA_PFN(DMA_32BIT_MASK)

#define DMA_64BIT_PFN   IOVA_PFN(DMA_64BIT_MASK)

/* 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_alloc_lock;/* Lock to protect iova  allocation */

        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 */

};

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);

struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);

void put_iova_domain(struct iova_domain *iovad);

#endif