| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* |
| 3 | * Copyright (c) 2006, Intel Corporation. |
| 4 | * |
| 5 | * Copyright (C) 2006-2008 Intel Corporation |
| 6 | * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
| 7 | */ |
| 8 | |
| 9 | #ifndef _IOVA_H_ |
| 10 | #define _IOVA_H_ |
| 11 | |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/rbtree.h> |
| 15 | #include <linux/dma-mapping.h> |
| 16 | |
| 17 | /* iova structure */ |
| 18 | struct iova { |
| 19 | struct rb_node node; |
| 20 | unsigned long pfn_hi; /* Highest allocated pfn */ |
| 21 | unsigned long pfn_lo; /* Lowest allocated pfn */ |
| 22 | }; |
| 23 | |
| 24 | |
| 25 | struct iova_rcache; |
| 26 | |
| 27 | /* holds all the iova translations for a domain */ |
| 28 | struct iova_domain { |
| 29 | spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ |
| 30 | struct rb_root rbroot; /* iova domain rbtree root */ |
| 31 | struct rb_node *cached_node; /* Save last alloced node */ |
| 32 | struct rb_node *cached32_node; /* Save last 32-bit alloced node */ |
| 33 | unsigned long granule; /* pfn granularity for this domain */ |
| 34 | unsigned long start_pfn; /* Lower limit for this domain */ |
| 35 | unsigned long dma_32bit_pfn; |
| 36 | unsigned long max32_alloc_size; /* Size of last failed allocation */ |
| 37 | struct iova anchor; /* rbtree lookup anchor */ |
| 38 | |
| 39 | struct iova_rcache *rcaches; |
| 40 | struct hlist_node cpuhp_dead; |
| 41 | }; |
| 42 | |
| 43 | static inline unsigned long iova_size(struct iova *iova) |
| 44 | { |
| 45 | return iova->pfn_hi - iova->pfn_lo + 1; |
| 46 | } |
| 47 | |
| 48 | static inline unsigned long iova_shift(struct iova_domain *iovad) |
| 49 | { |
| 50 | return __ffs(iovad->granule); |
| 51 | } |
| 52 | |
| 53 | static inline unsigned long iova_mask(struct iova_domain *iovad) |
| 54 | { |
| 55 | return iovad->granule - 1; |
| 56 | } |
| 57 | |
| 58 | static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) |
| 59 | { |
| 60 | return iova & iova_mask(iovad); |
| 61 | } |
| 62 | |
| 63 | static inline size_t iova_align(struct iova_domain *iovad, size_t size) |
| 64 | { |
| 65 | return ALIGN(size, iovad->granule); |
| 66 | } |
| 67 | |
| 68 | static inline size_t iova_align_down(struct iova_domain *iovad, size_t size) |
| 69 | { |
| 70 | return ALIGN_DOWN(size, iovad->granule); |
| 71 | } |
| 72 | |
| 73 | static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) |
| 74 | { |
| 75 | return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); |
| 76 | } |
| 77 | |
| 78 | static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) |
| 79 | { |
| 80 | return iova >> iova_shift(iovad); |
| 81 | } |
| 82 | |
| 83 | #if IS_REACHABLE(CONFIG_IOMMU_IOVA) |
| 84 | int iova_cache_get(void); |
| 85 | void iova_cache_put(void); |
| 86 | |
| 87 | unsigned long iova_rcache_range(void); |
| 88 | |
| 89 | void free_iova(struct iova_domain *iovad, unsigned long pfn); |
| 90 | void __free_iova(struct iova_domain *iovad, struct iova *iova); |
| 91 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, |
| 92 | unsigned long limit_pfn, |
| 93 | bool size_aligned); |
| 94 | void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, |
| 95 | unsigned long size); |
| 96 | unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, |
| 97 | unsigned long limit_pfn, bool flush_rcache); |
| 98 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
| 99 | unsigned long pfn_hi); |
| 100 | void init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
| 101 | unsigned long start_pfn); |
| 102 | int iova_domain_init_rcaches(struct iova_domain *iovad); |
| 103 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
| 104 | void put_iova_domain(struct iova_domain *iovad); |
| 105 | #else |
| 106 | static inline int iova_cache_get(void) |
| 107 | { |
| 108 | return -ENOTSUPP; |
| 109 | } |
| 110 | |
| 111 | static inline void iova_cache_put(void) |
| 112 | { |
| 113 | } |
| 114 | |
| 115 | static inline void free_iova(struct iova_domain *iovad, unsigned long pfn) |
| 116 | { |
| 117 | } |
| 118 | |
| 119 | static inline void __free_iova(struct iova_domain *iovad, struct iova *iova) |
| 120 | { |
| 121 | } |
| 122 | |
| 123 | static inline struct iova *alloc_iova(struct iova_domain *iovad, |
| 124 | unsigned long size, |
| 125 | unsigned long limit_pfn, |
| 126 | bool size_aligned) |
| 127 | { |
| 128 | return NULL; |
| 129 | } |
| 130 | |
| 131 | static inline void free_iova_fast(struct iova_domain *iovad, |
| 132 | unsigned long pfn, |
| 133 | unsigned long size) |
| 134 | { |
| 135 | } |
| 136 | |
| 137 | static inline unsigned long alloc_iova_fast(struct iova_domain *iovad, |
| 138 | unsigned long size, |
| 139 | unsigned long limit_pfn, |
| 140 | bool flush_rcache) |
| 141 | { |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | static inline struct iova *reserve_iova(struct iova_domain *iovad, |
| 146 | unsigned long pfn_lo, |
| 147 | unsigned long pfn_hi) |
| 148 | { |
| 149 | return NULL; |
| 150 | } |
| 151 | |
| 152 | static inline void init_iova_domain(struct iova_domain *iovad, |
| 153 | unsigned long granule, |
| 154 | unsigned long start_pfn) |
| 155 | { |
| 156 | } |
| 157 | |
| 158 | static inline struct iova *find_iova(struct iova_domain *iovad, |
| 159 | unsigned long pfn) |
| 160 | { |
| 161 | return NULL; |
| 162 | } |
| 163 | |
| 164 | static inline void put_iova_domain(struct iova_domain *iovad) |
| 165 | { |
| 166 | } |
| 167 | |
| 168 | #endif |
| 169 | |
| 170 | #endif |