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iova.h
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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 <[email protected]>
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 */
23 struct 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 */
30 struct 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 
37 struct iova *alloc_iova_mem(void);
38 void free_iova_mem(struct iova *iova);
39 void free_iova(struct iova_domain *iovad, unsigned long pfn);
40 void __free_iova(struct iova_domain *iovad, struct iova *iova);
41 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
42  unsigned long limit_pfn,
43  bool size_aligned);
44 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
45  unsigned long pfn_hi);
46 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
47 void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
48 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
49 void put_iova_domain(struct iova_domain *iovad);
50 
51 #endif