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Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -07001/*
2 * Copyright (c) 2006, Intel Corporation.
3 *
4 * This file is released under the GPLv2.
5 *
mark gross98bcef52008-02-23 15:23:35 -08006 * Copyright (C) 2006-2008 Intel Corporation
7 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -07008 *
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
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070019/* IO virtual address start page frame number */
20#define IOVA_START_PFN (1)
21
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070022/* 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 {
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070031 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 */
David Millerf6611972008-02-06 01:36:23 -080034 unsigned long dma_32bit_pfn;
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070035};
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,
Keshavamurthy, Anil Sf76aec72007-10-21 16:41:58 -070042 unsigned long limit_pfn,
43 bool size_aligned);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070044struct 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);
David Millerf6611972008-02-06 01:36:23 -080047void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070048struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
49void put_iova_domain(struct iova_domain *iovad);
Jiang Liu75f05562014-02-19 14:07:37 +080050struct iova *split_and_remove_iova(struct iova_domain *iovad,
51 struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070052
53#endif