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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/* iova structure */
20struct iova {
21 struct rb_node node;
22 unsigned long pfn_hi; /* IOMMU dish out addr hi */
23 unsigned long pfn_lo; /* IOMMU dish out addr lo */
24};
25
26/* holds all the iova translations for a domain */
27struct iova_domain {
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070028 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
29 struct rb_root rbroot; /* iova domain rbtree root */
30 struct rb_node *cached32_node; /* Save last alloced node */
Robin Murphy0fb5fe82015-01-12 17:51:16 +000031 unsigned long granule; /* pfn granularity for this domain */
Robin Murphy1b722502015-01-12 17:51:15 +000032 unsigned long start_pfn; /* Lower limit for this domain */
David Millerf6611972008-02-06 01:36:23 -080033 unsigned long dma_32bit_pfn;
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070034};
35
Jiang Liua156ef92014-07-11 14:19:36 +080036static inline unsigned long iova_size(struct iova *iova)
37{
38 return iova->pfn_hi - iova->pfn_lo + 1;
39}
40
Robin Murphy0fb5fe82015-01-12 17:51:16 +000041static inline unsigned long iova_shift(struct iova_domain *iovad)
42{
43 return __ffs(iovad->granule);
44}
45
46static inline unsigned long iova_mask(struct iova_domain *iovad)
47{
48 return iovad->granule - 1;
49}
50
51static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
52{
53 return iova & iova_mask(iovad);
54}
55
56static inline size_t iova_align(struct iova_domain *iovad, size_t size)
57{
58 return ALIGN(size, iovad->granule);
59}
60
61static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
62{
63 return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
64}
65
66static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
67{
68 return iova >> iova_shift(iovad);
69}
70
Sakari Ailusae1ff3d2015-07-13 14:31:28 +030071int iova_cache_get(void);
72void iova_cache_put(void);
Robin Murphy85b45452015-01-12 17:51:14 +000073
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070074struct iova *alloc_iova_mem(void);
75void free_iova_mem(struct iova *iova);
76void free_iova(struct iova_domain *iovad, unsigned long pfn);
77void __free_iova(struct iova_domain *iovad, struct iova *iova);
78struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
Keshavamurthy, Anil Sf76aec72007-10-21 16:41:58 -070079 unsigned long limit_pfn,
80 bool size_aligned);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070081struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
82 unsigned long pfn_hi);
83void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
Robin Murphy0fb5fe82015-01-12 17:51:16 +000084void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
85 unsigned long start_pfn, unsigned long pfn_32bit);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070086struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
87void put_iova_domain(struct iova_domain *iovad);
Jiang Liu75f05562014-02-19 14:07:37 +080088struct iova *split_and_remove_iova(struct iova_domain *iovad,
89 struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
Keshavamurthy, Anil Sf8de50e2007-10-21 16:41:48 -070090
91#endif