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 */ 18struct 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 25struct iova_rcache; 26 27/* holds all the iova translations for a domain */ 28struct 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 43static inline unsigned long iova_size(struct iova *iova) 44{ 45 return iova->pfn_hi - iova->pfn_lo + 1; 46} 47 48static inline unsigned long iova_shift(struct iova_domain *iovad) 49{ 50 return __ffs(iovad->granule); 51} 52 53static inline unsigned long iova_mask(struct iova_domain *iovad) 54{ 55 return iovad->granule - 1; 56} 57 58static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) 59{ 60 return iova & iova_mask(iovad); 61} 62 63static inline size_t iova_align(struct iova_domain *iovad, size_t size) 64{ 65 return ALIGN(size, iovad->granule); 66} 67 68static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) 69{ 70 return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); 71} 72 73static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) 74{ 75 return iova >> iova_shift(iovad); 76} 77 78#if IS_REACHABLE(CONFIG_IOMMU_IOVA) 79int iova_cache_get(void); 80void iova_cache_put(void); 81 82unsigned long iova_rcache_range(void); 83 84void free_iova(struct iova_domain *iovad, unsigned long pfn); 85void __free_iova(struct iova_domain *iovad, struct iova *iova); 86struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, 87 unsigned long limit_pfn, 88 bool size_aligned); 89void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, 90 unsigned long size); 91unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, 92 unsigned long limit_pfn, bool flush_rcache); 93struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, 94 unsigned long pfn_hi); 95void init_iova_domain(struct iova_domain *iovad, unsigned long granule, 96 unsigned long start_pfn); 97int iova_domain_init_rcaches(struct iova_domain *iovad); 98struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); 99void put_iova_domain(struct iova_domain *iovad); 100#else 101static inline int iova_cache_get(void) 102{ 103 return -ENOTSUPP; 104} 105 106static inline void iova_cache_put(void) 107{ 108} 109 110static inline void free_iova(struct iova_domain *iovad, unsigned long pfn) 111{ 112} 113 114static inline void __free_iova(struct iova_domain *iovad, struct iova *iova) 115{ 116} 117 118static inline struct iova *alloc_iova(struct iova_domain *iovad, 119 unsigned long size, 120 unsigned long limit_pfn, 121 bool size_aligned) 122{ 123 return NULL; 124} 125 126static inline void free_iova_fast(struct iova_domain *iovad, 127 unsigned long pfn, 128 unsigned long size) 129{ 130} 131 132static inline unsigned long alloc_iova_fast(struct iova_domain *iovad, 133 unsigned long size, 134 unsigned long limit_pfn, 135 bool flush_rcache) 136{ 137 return 0; 138} 139 140static inline struct iova *reserve_iova(struct iova_domain *iovad, 141 unsigned long pfn_lo, 142 unsigned long pfn_hi) 143{ 144 return NULL; 145} 146 147static inline void init_iova_domain(struct iova_domain *iovad, 148 unsigned long granule, 149 unsigned long start_pfn) 150{ 151} 152 153static inline struct iova *find_iova(struct iova_domain *iovad, 154 unsigned long pfn) 155{ 156 return NULL; 157} 158 159static inline void put_iova_domain(struct iova_domain *iovad) 160{ 161} 162 163#endif 164 165#endif 166