Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
37static inline unsigned long iova_size(struct iova *iova)
38{
39 return iova->pfn_hi - iova->pfn_lo + 1;
40}
41
42struct iova *alloc_iova_mem(void);
43void free_iova_mem(struct iova *iova);
44void free_iova(struct iova_domain *iovad, unsigned long pfn);
45void __free_iova(struct iova_domain *iovad, struct iova *iova);
46struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
47 unsigned long limit_pfn,
48 bool size_aligned);
49struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
50 unsigned long pfn_hi);
51void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
52void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
53struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
54void put_iova_domain(struct iova_domain *iovad);
55struct iova *split_and_remove_iova(struct iova_domain *iovad,
56 struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
57
58#endif