blob: 228f6c94b69c327543d118c5868ddce07a2f9a43 [file] [log] [blame]
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 {
31 spinlock_t iova_alloc_lock;/* Lock to protect iova allocation */
32 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
33 struct rb_root rbroot; /* iova domain rbtree root */
34 struct rb_node *cached32_node; /* Save last alloced node */
David Millerf6611972008-02-06 01:36:23 -080035 unsigned long dma_32bit_pfn;
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070036};
37
38struct iova *alloc_iova_mem(void);
39void free_iova_mem(struct iova *iova);
40void free_iova(struct iova_domain *iovad, unsigned long pfn);
41void __free_iova(struct iova_domain *iovad, struct iova *iova);
42struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
Keshavamurthy, Anil Sf76aec72007-10-21 16:41:58 -070043 unsigned long limit_pfn,
44 bool size_aligned);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070045struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
46 unsigned long pfn_hi);
47void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
David Millerf6611972008-02-06 01:36:23 -080048void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070049struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
50void put_iova_domain(struct iova_domain *iovad);
51
52#endif