2 * Copyright (c) 2006, Intel Corporation.
4 * This file is released under the GPLv2.
6 * Copyright (C) 2006-2008 Intel Corporation
7 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/rbtree.h>
17 #include <linux/dma-mapping.h>
22 unsigned long pfn_hi; /* Highest allocated pfn */
23 unsigned long pfn_lo; /* Lowest allocated pfn */
27 struct iova_cpu_rcache;
29 #define IOVA_RANGE_CACHE_MAX_SIZE 6 /* log of max cached IOVA range size (in pages) */
30 #define MAX_GLOBAL_MAGS 32 /* magazines per bin */
34 unsigned long depot_size;
35 struct iova_magazine *depot[MAX_GLOBAL_MAGS];
36 struct iova_cpu_rcache __percpu *cpu_rcaches;
41 /* Call-Back from IOVA code into IOMMU drivers */
42 typedef void (* iova_flush_cb)(struct iova_domain *domain);
44 /* Destructor for per-entry data */
45 typedef void (* iova_entry_dtor)(unsigned long data);
47 /* Number of entries per Flush Queue */
48 #define IOVA_FQ_SIZE 256
50 /* Flush Queue entry for defered flushing */
51 struct iova_fq_entry {
52 unsigned long iova_pfn;
57 /* Per-CPU Flush Queue structure */
59 struct iova_fq_entry entries[IOVA_FQ_SIZE];
63 /* holds all the iova translations for a domain */
65 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
66 struct rb_root rbroot; /* iova domain rbtree root */
67 struct rb_node *cached32_node; /* Save last alloced node */
68 unsigned long granule; /* pfn granularity for this domain */
69 unsigned long start_pfn; /* Lower limit for this domain */
70 unsigned long dma_32bit_pfn;
71 struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */
73 iova_flush_cb flush_cb; /* Call-Back function to flush IOMMU
76 iova_entry_dtor entry_dtor; /* IOMMU driver specific destructor for
79 struct iova_fq __percpu *fq; /* Flush Queue */
82 static inline unsigned long iova_size(struct iova *iova)
84 return iova->pfn_hi - iova->pfn_lo + 1;
87 static inline unsigned long iova_shift(struct iova_domain *iovad)
89 return __ffs(iovad->granule);
92 static inline unsigned long iova_mask(struct iova_domain *iovad)
94 return iovad->granule - 1;
97 static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
99 return iova & iova_mask(iovad);
102 static inline size_t iova_align(struct iova_domain *iovad, size_t size)
104 return ALIGN(size, iovad->granule);
107 static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
109 return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
112 static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
114 return iova >> iova_shift(iovad);
117 #if IS_ENABLED(CONFIG_IOMMU_IOVA)
118 int iova_cache_get(void);
119 void iova_cache_put(void);
121 struct iova *alloc_iova_mem(void);
122 void free_iova_mem(struct iova *iova);
123 void free_iova(struct iova_domain *iovad, unsigned long pfn);
124 void __free_iova(struct iova_domain *iovad, struct iova *iova);
125 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
126 unsigned long limit_pfn,
128 void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
130 unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
131 unsigned long limit_pfn);
132 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
133 unsigned long pfn_hi);
134 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
135 void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
136 unsigned long start_pfn, unsigned long pfn_32bit);
137 int init_iova_flush_queue(struct iova_domain *iovad,
138 iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
139 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
140 void put_iova_domain(struct iova_domain *iovad);
141 struct iova *split_and_remove_iova(struct iova_domain *iovad,
142 struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
143 void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
145 static inline int iova_cache_get(void)
150 static inline void iova_cache_put(void)
154 static inline struct iova *alloc_iova_mem(void)
159 static inline void free_iova_mem(struct iova *iova)
163 static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
167 static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
171 static inline struct iova *alloc_iova(struct iova_domain *iovad,
173 unsigned long limit_pfn,
179 static inline void free_iova_fast(struct iova_domain *iovad,
185 static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
187 unsigned long limit_pfn)
192 static inline struct iova *reserve_iova(struct iova_domain *iovad,
193 unsigned long pfn_lo,
194 unsigned long pfn_hi)
199 static inline void copy_reserved_iova(struct iova_domain *from,
200 struct iova_domain *to)
204 static inline void init_iova_domain(struct iova_domain *iovad,
205 unsigned long granule,
206 unsigned long start_pfn,
207 unsigned long pfn_32bit)
211 static inline int init_iova_flush_queue(struct iova_domain *iovad,
212 iova_flush_cb flush_cb,
213 iova_entry_dtor entry_dtor)
218 static inline struct iova *find_iova(struct iova_domain *iovad,
224 static inline void put_iova_domain(struct iova_domain *iovad)
228 static inline struct iova *split_and_remove_iova(struct iova_domain *iovad,
230 unsigned long pfn_lo,
231 unsigned long pfn_hi)
236 static inline void free_cpu_cached_iovas(unsigned int cpu,
237 struct iova_domain *iovad)