Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2006, Intel Corporation. |
| 3 | * |
| 4 | * This file is released under the GPLv2. |
| 5 | * |
mark gross | 98bcef5 | 2008-02-23 15:23:35 -0800 | [diff] [blame] | 6 | * Copyright (C) 2006-2008 Intel Corporation |
| 7 | * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 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 | |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 19 | /* iova structure */ |
| 20 | struct 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 */ |
| 27 | struct iova_domain { |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 28 | 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 Murphy | 1b72250 | 2015-01-12 17:51:15 +0000 | [diff] [blame^] | 31 | unsigned long start_pfn; /* Lower limit for this domain */ |
David Miller | f661197 | 2008-02-06 01:36:23 -0800 | [diff] [blame] | 32 | unsigned long dma_32bit_pfn; |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 33 | }; |
| 34 | |
Jiang Liu | a156ef9 | 2014-07-11 14:19:36 +0800 | [diff] [blame] | 35 | static inline unsigned long iova_size(struct iova *iova) |
| 36 | { |
| 37 | return iova->pfn_hi - iova->pfn_lo + 1; |
| 38 | } |
| 39 | |
Robin Murphy | 85b4545 | 2015-01-12 17:51:14 +0000 | [diff] [blame] | 40 | int iommu_iova_cache_init(void); |
| 41 | void iommu_iova_cache_destroy(void); |
| 42 | |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 43 | struct iova *alloc_iova_mem(void); |
| 44 | void free_iova_mem(struct iova *iova); |
| 45 | void free_iova(struct iova_domain *iovad, unsigned long pfn); |
| 46 | void __free_iova(struct iova_domain *iovad, struct iova *iova); |
| 47 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, |
Keshavamurthy, Anil S | f76aec7 | 2007-10-21 16:41:58 -0700 | [diff] [blame] | 48 | unsigned long limit_pfn, |
| 49 | bool size_aligned); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 50 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
| 51 | unsigned long pfn_hi); |
| 52 | void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); |
Robin Murphy | 1b72250 | 2015-01-12 17:51:15 +0000 | [diff] [blame^] | 53 | void init_iova_domain(struct iova_domain *iovad, unsigned long start_pfn, |
| 54 | unsigned long pfn_32bit); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 55 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
| 56 | void put_iova_domain(struct iova_domain *iovad); |
Jiang Liu | 75f0556 | 2014-02-19 14:07:37 +0800 | [diff] [blame] | 57 | struct iova *split_and_remove_iova(struct iova_domain *iovad, |
| 58 | struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 59 | |
| 60 | #endif |