1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2006, Intel Corporation.
5 * Copyright (C) 2006-2008 Intel Corporation
6 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/rbtree.h>
15 #include <linux/dma-mapping.h>
20 unsigned long pfn_hi; /* Highest allocated pfn */
21 unsigned long pfn_lo; /* Lowest allocated pfn */
25 struct iova_cpu_rcache;
27 #define IOVA_RANGE_CACHE_MAX_SIZE 6 /* log of max cached IOVA range size (in pages) */
28 #define MAX_GLOBAL_MAGS 32 /* magazines per bin */
32 unsigned long depot_size;
33 struct iova_magazine *depot[MAX_GLOBAL_MAGS];
34 struct iova_cpu_rcache __percpu *cpu_rcaches;
37 /* holds all the iova translations for a domain */
39 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
40 struct rb_root rbroot; /* iova domain rbtree root */
41 struct rb_node *cached_node; /* Save last alloced node */
42 struct rb_node *cached32_node; /* Save last 32-bit alloced node */
43 unsigned long granule; /* pfn granularity for this domain */
44 unsigned long start_pfn; /* Lower limit for this domain */
45 unsigned long dma_32bit_pfn;
46 unsigned long max32_alloc_size; /* Size of last failed allocation */
47 struct iova anchor; /* rbtree lookup anchor */
49 struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */
50 struct hlist_node cpuhp_dead;
53 static inline unsigned long iova_size(struct iova *iova)
55 return iova->pfn_hi - iova->pfn_lo + 1;
58 static inline unsigned long iova_shift(struct iova_domain *iovad)
60 return __ffs(iovad->granule);
63 static inline unsigned long iova_mask(struct iova_domain *iovad)
65 return iovad->granule - 1;
68 static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
70 return iova & iova_mask(iovad);
73 static inline size_t iova_align(struct iova_domain *iovad, size_t size)
75 return ALIGN(size, iovad->granule);
78 static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
80 return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
83 static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
85 return iova >> iova_shift(iovad);
88 #if IS_ENABLED(CONFIG_IOMMU_IOVA)
89 int iova_cache_get(void);
90 void iova_cache_put(void);
92 void free_iova(struct iova_domain *iovad, unsigned long pfn);
93 void __free_iova(struct iova_domain *iovad, struct iova *iova);
94 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
95 unsigned long limit_pfn,
97 void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
99 unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
100 unsigned long limit_pfn, bool flush_rcache);
101 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
102 unsigned long pfn_hi);
103 void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
104 unsigned long start_pfn);
105 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
106 void put_iova_domain(struct iova_domain *iovad);
108 static inline int iova_cache_get(void)
113 static inline void iova_cache_put(void)
117 static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
121 static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
125 static inline struct iova *alloc_iova(struct iova_domain *iovad,
127 unsigned long limit_pfn,
133 static inline void free_iova_fast(struct iova_domain *iovad,
139 static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
141 unsigned long limit_pfn,
147 static inline struct iova *reserve_iova(struct iova_domain *iovad,
148 unsigned long pfn_lo,
149 unsigned long pfn_hi)
154 static inline void init_iova_domain(struct iova_domain *iovad,
155 unsigned long granule,
156 unsigned long start_pfn)
160 static inline struct iova *find_iova(struct iova_domain *iovad,
166 static inline void put_iova_domain(struct iova_domain *iovad)