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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
20#define IOVA_START_PFN (1)
21
22
23struct iova {
24 struct rb_node node;
25 unsigned long pfn_hi;
26 unsigned long pfn_lo;
27};
28
29
30struct iova_domain {
31 spinlock_t iova_rbtree_lock;
32 struct rb_root rbroot;
33 struct rb_node *cached32_node;
34 unsigned long dma_32bit_pfn;
35};
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,
42 unsigned long limit_pfn,
43 bool size_aligned);
44struct 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);
47void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
48struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
49void put_iova_domain(struct iova_domain *iovad);
50
51#endif
52