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 | 0fb5fe8 | 2015-01-12 17:51:16 +0000 | [diff] [blame] | 31 | unsigned long granule; /* pfn granularity for this domain */ |
Robin Murphy | 1b72250 | 2015-01-12 17:51:15 +0000 | [diff] [blame] | 32 | unsigned long start_pfn; /* Lower limit for this domain */ |
David Miller | f661197 | 2008-02-06 01:36:23 -0800 | [diff] [blame] | 33 | unsigned long dma_32bit_pfn; |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 34 | }; |
| 35 | |
Jiang Liu | a156ef9 | 2014-07-11 14:19:36 +0800 | [diff] [blame] | 36 | static inline unsigned long iova_size(struct iova *iova) |
| 37 | { |
| 38 | return iova->pfn_hi - iova->pfn_lo + 1; |
| 39 | } |
| 40 | |
Robin Murphy | 0fb5fe8 | 2015-01-12 17:51:16 +0000 | [diff] [blame] | 41 | static inline unsigned long iova_shift(struct iova_domain *iovad) |
| 42 | { |
| 43 | return __ffs(iovad->granule); |
| 44 | } |
| 45 | |
| 46 | static inline unsigned long iova_mask(struct iova_domain *iovad) |
| 47 | { |
| 48 | return iovad->granule - 1; |
| 49 | } |
| 50 | |
| 51 | static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) |
| 52 | { |
| 53 | return iova & iova_mask(iovad); |
| 54 | } |
| 55 | |
| 56 | static inline size_t iova_align(struct iova_domain *iovad, size_t size) |
| 57 | { |
| 58 | return ALIGN(size, iovad->granule); |
| 59 | } |
| 60 | |
| 61 | static 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 | |
| 66 | static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) |
| 67 | { |
| 68 | return iova >> iova_shift(iovad); |
| 69 | } |
| 70 | |
Robin Murphy | 85b4545 | 2015-01-12 17:51:14 +0000 | [diff] [blame] | 71 | int iommu_iova_cache_init(void); |
| 72 | void iommu_iova_cache_destroy(void); |
| 73 | |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 74 | struct iova *alloc_iova_mem(void); |
| 75 | void free_iova_mem(struct iova *iova); |
| 76 | void free_iova(struct iova_domain *iovad, unsigned long pfn); |
| 77 | void __free_iova(struct iova_domain *iovad, struct iova *iova); |
| 78 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, |
Keshavamurthy, Anil S | f76aec7 | 2007-10-21 16:41:58 -0700 | [diff] [blame] | 79 | unsigned long limit_pfn, |
| 80 | bool size_aligned); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 81 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
| 82 | unsigned long pfn_hi); |
| 83 | void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); |
Robin Murphy | 0fb5fe8 | 2015-01-12 17:51:16 +0000 | [diff] [blame] | 84 | void init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
| 85 | unsigned long start_pfn, unsigned long pfn_32bit); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 86 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
| 87 | void put_iova_domain(struct iova_domain *iovad); |
Jiang Liu | 75f0556 | 2014-02-19 14:07:37 +0800 | [diff] [blame] | 88 | struct iova *split_and_remove_iova(struct iova_domain *iovad, |
| 89 | struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 90 | |
| 91 | #endif |