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/atomic.h> 16 #include <linux/dma-mapping.h> 17 18 /* iova structure */ 19 struct iova { 20 struct rb_node node; 21 unsigned long pfn_hi; /* Highest allocated pfn */ 22 unsigned long pfn_lo; /* Lowest allocated pfn */ 23 }; 24 25 struct iova_magazine; 26 struct iova_cpu_rcache; 27 28 #define IOVA_RANGE_CACHE_MAX_SIZE 6 /* log of max cached IOVA range size (in pages) */ 29 #define MAX_GLOBAL_MAGS 32 /* magazines per bin */ 30 31 struct iova_rcache { 32 spinlock_t lock; 33 unsigned long depot_size; 34 struct iova_magazine *depot[MAX_GLOBAL_MAGS]; 35 struct iova_cpu_rcache __percpu *cpu_rcaches; 36 }; 37 38 struct iova_domain; 39 40 /* Call-Back from IOVA code into IOMMU drivers */ 41 typedef void (* iova_flush_cb)(struct iova_domain *domain); 42 43 /* Destructor for per-entry data */ 44 typedef void (* iova_entry_dtor)(unsigned long data); 45 46 /* Number of entries per Flush Queue */ 47 #define IOVA_FQ_SIZE 256 48 49 /* Timeout (in ms) after which entries are flushed from the Flush-Queue */ 50 #define IOVA_FQ_TIMEOUT 10 51 52 /* Flush Queue entry for defered flushing */ 53 struct iova_fq_entry { 54 unsigned long iova_pfn; 55 unsigned long pages; 56 unsigned long data; 57 u64 counter; /* Flush counter when this entrie was added */ 58 }; 59 60 /* Per-CPU Flush Queue structure */ 61 struct iova_fq { 62 struct iova_fq_entry entries[IOVA_FQ_SIZE]; 63 unsigned head, tail; 64 spinlock_t lock; 65 }; 66 67 /* holds all the iova translations for a domain */ 68 struct iova_domain { 69 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ 70 struct rb_root rbroot; /* iova domain rbtree root */ 71 struct rb_node *cached_node; /* Save last alloced node */ 72 struct rb_node *cached32_node; /* Save last 32-bit alloced node */ 73 unsigned long granule; /* pfn granularity for this domain */ 74 unsigned long start_pfn; /* Lower limit for this domain */ 75 unsigned long dma_32bit_pfn; 76 unsigned long max32_alloc_size; /* Size of last failed allocation */ 77 struct iova_fq __percpu *fq; /* Flush Queue */ 78 79 atomic64_t fq_flush_start_cnt; /* Number of TLB flushes that 80 have been started */ 81 82 atomic64_t fq_flush_finish_cnt; /* Number of TLB flushes that 83 have been finished */ 84 85 struct iova anchor; /* rbtree lookup anchor */ 86 struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */ 87 88 iova_flush_cb flush_cb; /* Call-Back function to flush IOMMU 89 TLBs */ 90 91 iova_entry_dtor entry_dtor; /* IOMMU driver specific destructor for 92 iova entry */ 93 94 struct timer_list fq_timer; /* Timer to regularily empty the 95 flush-queues */ 96 atomic_t fq_timer_on; /* 1 when timer is active, 0 97 when not */ 98 }; 99 100 static inline unsigned long iova_size(struct iova *iova) 101 { 102 return iova->pfn_hi - iova->pfn_lo + 1; 103 } 104 105 static inline unsigned long iova_shift(struct iova_domain *iovad) 106 { 107 return __ffs(iovad->granule); 108 } 109 110 static inline unsigned long iova_mask(struct iova_domain *iovad) 111 { 112 return iovad->granule - 1; 113 } 114 115 static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) 116 { 117 return iova & iova_mask(iovad); 118 } 119 120 static inline size_t iova_align(struct iova_domain *iovad, size_t size) 121 { 122 return ALIGN(size, iovad->granule); 123 } 124 125 static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) 126 { 127 return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); 128 } 129 130 static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) 131 { 132 return iova >> iova_shift(iovad); 133 } 134 135 #if IS_ENABLED(CONFIG_IOMMU_IOVA) 136 int iova_cache_get(void); 137 void iova_cache_put(void); 138 139 void free_iova(struct iova_domain *iovad, unsigned long pfn); 140 void __free_iova(struct iova_domain *iovad, struct iova *iova); 141 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, 142 unsigned long limit_pfn, 143 bool size_aligned); 144 void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, 145 unsigned long size); 146 void queue_iova(struct iova_domain *iovad, 147 unsigned long pfn, unsigned long pages, 148 unsigned long data); 149 unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, 150 unsigned long limit_pfn, bool flush_rcache); 151 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, 152 unsigned long pfn_hi); 153 void init_iova_domain(struct iova_domain *iovad, unsigned long granule, 154 unsigned long start_pfn); 155 int init_iova_flush_queue(struct iova_domain *iovad, 156 iova_flush_cb flush_cb, iova_entry_dtor entry_dtor); 157 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); 158 void put_iova_domain(struct iova_domain *iovad); 159 void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad); 160 #else 161 static inline int iova_cache_get(void) 162 { 163 return -ENOTSUPP; 164 } 165 166 static inline void iova_cache_put(void) 167 { 168 } 169 170 static inline void free_iova(struct iova_domain *iovad, unsigned long pfn) 171 { 172 } 173 174 static inline void __free_iova(struct iova_domain *iovad, struct iova *iova) 175 { 176 } 177 178 static inline struct iova *alloc_iova(struct iova_domain *iovad, 179 unsigned long size, 180 unsigned long limit_pfn, 181 bool size_aligned) 182 { 183 return NULL; 184 } 185 186 static inline void free_iova_fast(struct iova_domain *iovad, 187 unsigned long pfn, 188 unsigned long size) 189 { 190 } 191 192 static inline void queue_iova(struct iova_domain *iovad, 193 unsigned long pfn, unsigned long pages, 194 unsigned long data) 195 { 196 } 197 198 static inline unsigned long alloc_iova_fast(struct iova_domain *iovad, 199 unsigned long size, 200 unsigned long limit_pfn, 201 bool flush_rcache) 202 { 203 return 0; 204 } 205 206 static inline struct iova *reserve_iova(struct iova_domain *iovad, 207 unsigned long pfn_lo, 208 unsigned long pfn_hi) 209 { 210 return NULL; 211 } 212 213 static inline void init_iova_domain(struct iova_domain *iovad, 214 unsigned long granule, 215 unsigned long start_pfn) 216 { 217 } 218 219 static inline int init_iova_flush_queue(struct iova_domain *iovad, 220 iova_flush_cb flush_cb, 221 iova_entry_dtor entry_dtor) 222 { 223 return -ENODEV; 224 } 225 226 static inline struct iova *find_iova(struct iova_domain *iovad, 227 unsigned long pfn) 228 { 229 return NULL; 230 } 231 232 static inline void put_iova_domain(struct iova_domain *iovad) 233 { 234 } 235 236 static inline void free_cpu_cached_iovas(unsigned int cpu, 237 struct iova_domain *iovad) 238 { 239 } 240 #endif 241 242 #endif 243