blob: ae3028d5a9415e76a076928704c67755e3fe06ec [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 *
6 * Copyright (C) 2006 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
7 *
8 */
9
10#ifndef _IOVA_H_
11#define _IOVA_H_
12
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/rbtree.h>
16#include <linux/dma-mapping.h>
17
18/*
19 * We need a fixed PAGE_SIZE of 4K irrespective of
20 * arch PAGE_SIZE for IOMMU page tables.
21 */
22#define PAGE_SHIFT_4K (12)
23#define PAGE_SIZE_4K (1UL << PAGE_SHIFT_4K)
24#define PAGE_MASK_4K (((u64)-1) << PAGE_SHIFT_4K)
25#define PAGE_ALIGN_4K(addr) (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
26
27/* IO virtual address start page frame number */
28#define IOVA_START_PFN (1)
29
30#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT_4K)
31#define DMA_32BIT_PFN IOVA_PFN(DMA_32BIT_MASK)
32#define DMA_64BIT_PFN IOVA_PFN(DMA_64BIT_MASK)
33
34/* iova structure */
35struct iova {
36 struct rb_node node;
37 unsigned long pfn_hi; /* IOMMU dish out addr hi */
38 unsigned long pfn_lo; /* IOMMU dish out addr lo */
39};
40
41/* holds all the iova translations for a domain */
42struct iova_domain {
43 spinlock_t iova_alloc_lock;/* Lock to protect iova allocation */
44 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
45 struct rb_root rbroot; /* iova domain rbtree root */
46 struct rb_node *cached32_node; /* Save last alloced node */
47};
48
49struct iova *alloc_iova_mem(void);
50void free_iova_mem(struct iova *iova);
51void free_iova(struct iova_domain *iovad, unsigned long pfn);
52void __free_iova(struct iova_domain *iovad, struct iova *iova);
53struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
Keshavamurthy, Anil Sf76aec72007-10-21 16:41:58 -070054 unsigned long limit_pfn,
55 bool size_aligned);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070056struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
57 unsigned long pfn_hi);
58void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
59void init_iova_domain(struct iova_domain *iovad);
60struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
61void put_iova_domain(struct iova_domain *iovad);
62
63#endif