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 */
27 /* holds all the iova translations for a 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 */
39 struct iova_rcache *rcaches;
40 struct hlist_node cpuhp_dead;
43 static inline unsigned long iova_size(struct iova *iova)
45 return iova->pfn_hi - iova->pfn_lo + 1;
48 static inline unsigned long iova_shift(struct iova_domain *iovad)
50 return __ffs(iovad->granule);
53 static inline unsigned long iova_mask(struct iova_domain *iovad)
55 return iovad->granule - 1;
58 static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
60 return iova & iova_mask(iovad);
63 static inline size_t iova_align(struct iova_domain *iovad, size_t size)
65 return ALIGN(size, iovad->granule);
68 static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
70 return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
73 static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
75 return iova >> iova_shift(iovad);
78 #if IS_REACHABLE(CONFIG_IOMMU_IOVA)
79 int iova_cache_get(void);
80 void iova_cache_put(void);
82 unsigned long iova_rcache_range(void);
84 void free_iova(struct iova_domain *iovad, unsigned long pfn);
85 void __free_iova(struct iova_domain *iovad, struct iova *iova);
86 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
87 unsigned long limit_pfn,
89 void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
91 unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
92 unsigned long limit_pfn, bool flush_rcache);
93 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
94 unsigned long pfn_hi);
95 void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
96 unsigned long start_pfn);
97 int iova_domain_init_rcaches(struct iova_domain *iovad);
98 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
99 void put_iova_domain(struct iova_domain *iovad);
101 static inline int iova_cache_get(void)
106 static inline void iova_cache_put(void)
110 static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
114 static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
118 static inline struct iova *alloc_iova(struct iova_domain *iovad,
120 unsigned long limit_pfn,
126 static inline void free_iova_fast(struct iova_domain *iovad,
132 static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
134 unsigned long limit_pfn,
140 static inline struct iova *reserve_iova(struct iova_domain *iovad,
141 unsigned long pfn_lo,
142 unsigned long pfn_hi)
147 static inline void init_iova_domain(struct iova_domain *iovad,
148 unsigned long granule,
149 unsigned long start_pfn)
153 static inline struct iova *find_iova(struct iova_domain *iovad,
159 static inline void put_iova_domain(struct iova_domain *iovad)