/include/linux/iova.h

 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