This source file includes following definitions.
- iova_size
- iova_shift
- iova_mask
- iova_offset
- iova_align
- iova_dma_addr
- iova_pfn
- iova_cache_get
- iova_cache_put
- alloc_iova_mem
- free_iova_mem
- free_iova
- __free_iova
- alloc_iova
- free_iova_fast
- queue_iova
- alloc_iova_fast
- reserve_iova
- copy_reserved_iova
- init_iova_domain
- has_iova_flush_queue
- init_iova_flush_queue
- find_iova
- put_iova_domain
- split_and_remove_iova
- free_cpu_cached_iovas
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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
19 struct iova {
20 struct rb_node node;
21 unsigned long pfn_hi;
22 unsigned long pfn_lo;
23 };
24
25 struct iova_magazine;
26 struct iova_cpu_rcache;
27
28 #define IOVA_RANGE_CACHE_MAX_SIZE 6
29 #define MAX_GLOBAL_MAGS 32
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
41 typedef void (* iova_flush_cb)(struct iova_domain *domain);
42
43
44 typedef void (* iova_entry_dtor)(unsigned long data);
45
46
47 #define IOVA_FQ_SIZE 256
48
49
50 #define IOVA_FQ_TIMEOUT 10
51
52
53 struct iova_fq_entry {
54 unsigned long iova_pfn;
55 unsigned long pages;
56 unsigned long data;
57 u64 counter;
58 };
59
60
61 struct iova_fq {
62 struct iova_fq_entry entries[IOVA_FQ_SIZE];
63 unsigned head, tail;
64 spinlock_t lock;
65 };
66
67
68 struct iova_domain {
69 spinlock_t iova_rbtree_lock;
70 struct rb_root rbroot;
71 struct rb_node *cached_node;
72 struct rb_node *cached32_node;
73 unsigned long granule;
74 unsigned long start_pfn;
75 unsigned long dma_32bit_pfn;
76 unsigned long max32_alloc_size;
77 struct iova_fq __percpu *fq;
78
79 atomic64_t fq_flush_start_cnt;
80
81
82 atomic64_t fq_flush_finish_cnt;
83
84
85 struct iova anchor;
86 struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE];
87
88 iova_flush_cb flush_cb;
89
90
91 iova_entry_dtor entry_dtor;
92
93
94 struct timer_list fq_timer;
95
96 atomic_t fq_timer_on;
97
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 struct iova *alloc_iova_mem(void);
140 void free_iova_mem(struct iova *iova);
141 void free_iova(struct iova_domain *iovad, unsigned long pfn);
142 void __free_iova(struct iova_domain *iovad, struct iova *iova);
143 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
144 unsigned long limit_pfn,
145 bool size_aligned);
146 void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
147 unsigned long size);
148 void queue_iova(struct iova_domain *iovad,
149 unsigned long pfn, unsigned long pages,
150 unsigned long data);
151 unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
152 unsigned long limit_pfn, bool flush_rcache);
153 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
154 unsigned long pfn_hi);
155 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
156 void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
157 unsigned long start_pfn);
158 bool has_iova_flush_queue(struct iova_domain *iovad);
159 int init_iova_flush_queue(struct iova_domain *iovad,
160 iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
161 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
162 void put_iova_domain(struct iova_domain *iovad);
163 struct iova *split_and_remove_iova(struct iova_domain *iovad,
164 struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
165 void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
166 #else
167 static inline int iova_cache_get(void)
168 {
169 return -ENOTSUPP;
170 }
171
172 static inline void iova_cache_put(void)
173 {
174 }
175
176 static inline struct iova *alloc_iova_mem(void)
177 {
178 return NULL;
179 }
180
181 static inline void free_iova_mem(struct iova *iova)
182 {
183 }
184
185 static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
186 {
187 }
188
189 static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
190 {
191 }
192
193 static inline struct iova *alloc_iova(struct iova_domain *iovad,
194 unsigned long size,
195 unsigned long limit_pfn,
196 bool size_aligned)
197 {
198 return NULL;
199 }
200
201 static inline void free_iova_fast(struct iova_domain *iovad,
202 unsigned long pfn,
203 unsigned long size)
204 {
205 }
206
207 static inline void queue_iova(struct iova_domain *iovad,
208 unsigned long pfn, unsigned long pages,
209 unsigned long data)
210 {
211 }
212
213 static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
214 unsigned long size,
215 unsigned long limit_pfn,
216 bool flush_rcache)
217 {
218 return 0;
219 }
220
221 static inline struct iova *reserve_iova(struct iova_domain *iovad,
222 unsigned long pfn_lo,
223 unsigned long pfn_hi)
224 {
225 return NULL;
226 }
227
228 static inline void copy_reserved_iova(struct iova_domain *from,
229 struct iova_domain *to)
230 {
231 }
232
233 static inline void init_iova_domain(struct iova_domain *iovad,
234 unsigned long granule,
235 unsigned long start_pfn)
236 {
237 }
238
239 static inline bool has_iova_flush_queue(struct iova_domain *iovad)
240 {
241 return false;
242 }
243
244 static inline int init_iova_flush_queue(struct iova_domain *iovad,
245 iova_flush_cb flush_cb,
246 iova_entry_dtor entry_dtor)
247 {
248 return -ENODEV;
249 }
250
251 static inline struct iova *find_iova(struct iova_domain *iovad,
252 unsigned long pfn)
253 {
254 return NULL;
255 }
256
257 static inline void put_iova_domain(struct iova_domain *iovad)
258 {
259 }
260
261 static inline struct iova *split_and_remove_iova(struct iova_domain *iovad,
262 struct iova *iova,
263 unsigned long pfn_lo,
264 unsigned long pfn_hi)
265 {
266 return NULL;
267 }
268
269 static inline void free_cpu_cached_iovas(unsigned int cpu,
270 struct iova_domain *iovad)
271 {
272 }
273 #endif
274
275 #endif