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55716d26 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
f8de50eb KA |
2 | /* |
3 | * Copyright (c) 2006, Intel Corporation. | |
4 | * | |
98bcef56 | 5 | * Copyright (C) 2006-2008 Intel Corporation |
6 | * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
f8de50eb KA |
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> | |
fb418dab | 15 | #include <linux/atomic.h> |
f8de50eb KA |
16 | #include <linux/dma-mapping.h> |
17 | ||
f8de50eb KA |
18 | /* iova structure */ |
19 | struct iova { | |
20 | struct rb_node node; | |
9257b4a2 OP |
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; | |
f8de50eb KA |
36 | }; |
37 | ||
42f87e71 JR |
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 | ||
9a005a80 JR |
49 | /* Timeout (in ms) after which entries are flushed from the Flush-Queue */ |
50 | #define IOVA_FQ_TIMEOUT 10 | |
51 | ||
42f87e71 JR |
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; | |
fb418dab | 57 | u64 counter; /* Flush counter when this entrie was added */ |
42f87e71 JR |
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; | |
8109c2a2 | 64 | spinlock_t lock; |
42f87e71 JR |
65 | }; |
66 | ||
f8de50eb KA |
67 | /* holds all the iova translations for a domain */ |
68 | struct iova_domain { | |
f8de50eb KA |
69 | spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ |
70 | struct rb_root rbroot; /* iova domain rbtree root */ | |
e60aa7b5 RM |
71 | struct rb_node *cached_node; /* Save last alloced node */ |
72 | struct rb_node *cached32_node; /* Save last 32-bit alloced node */ | |
0fb5fe87 | 73 | unsigned long granule; /* pfn granularity for this domain */ |
1b722500 | 74 | unsigned long start_pfn; /* Lower limit for this domain */ |
f661197e | 75 | unsigned long dma_32bit_pfn; |
bee60e94 | 76 | unsigned long max32_alloc_size; /* Size of last failed allocation */ |
14bd9a60 JQ |
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 | ||
bb68b2fb | 85 | struct iova anchor; /* rbtree lookup anchor */ |
9257b4a2 | 86 | struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */ |
42f87e71 JR |
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 | ||
9a005a80 JR |
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 */ | |
f598a497 | 98 | struct hlist_node cpuhp_dead; |
f8de50eb KA |
99 | }; |
100 | ||
a156ef99 JL |
101 | static inline unsigned long iova_size(struct iova *iova) |
102 | { | |
103 | return iova->pfn_hi - iova->pfn_lo + 1; | |
104 | } | |
105 | ||
0fb5fe87 RM |
106 | static inline unsigned long iova_shift(struct iova_domain *iovad) |
107 | { | |
108 | return __ffs(iovad->granule); | |
109 | } | |
110 | ||
111 | static inline unsigned long iova_mask(struct iova_domain *iovad) | |
112 | { | |
113 | return iovad->granule - 1; | |
114 | } | |
115 | ||
116 | static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) | |
117 | { | |
118 | return iova & iova_mask(iovad); | |
119 | } | |
120 | ||
121 | static inline size_t iova_align(struct iova_domain *iovad, size_t size) | |
122 | { | |
123 | return ALIGN(size, iovad->granule); | |
124 | } | |
125 | ||
126 | static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) | |
127 | { | |
128 | return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); | |
129 | } | |
130 | ||
131 | static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) | |
132 | { | |
133 | return iova >> iova_shift(iovad); | |
134 | } | |
135 | ||
b4d8c7ae | 136 | #if IS_ENABLED(CONFIG_IOMMU_IOVA) |
ae1ff3d6 SA |
137 | int iova_cache_get(void); |
138 | void iova_cache_put(void); | |
85b45456 | 139 | |
f8de50eb KA |
140 | void free_iova(struct iova_domain *iovad, unsigned long pfn); |
141 | void __free_iova(struct iova_domain *iovad, struct iova *iova); | |
142 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, | |
f76aec76 KA |
143 | unsigned long limit_pfn, |
144 | bool size_aligned); | |
9257b4a2 OP |
145 | void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, |
146 | unsigned long size); | |
19282101 JR |
147 | void queue_iova(struct iova_domain *iovad, |
148 | unsigned long pfn, unsigned long pages, | |
149 | unsigned long data); | |
9257b4a2 | 150 | unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, |
538d5b33 | 151 | unsigned long limit_pfn, bool flush_rcache); |
f8de50eb KA |
152 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
153 | unsigned long pfn_hi); | |
0fb5fe87 | 154 | void init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
aa3ac946 | 155 | unsigned long start_pfn); |
42f87e71 JR |
156 | int init_iova_flush_queue(struct iova_domain *iovad, |
157 | iova_flush_cb flush_cb, iova_entry_dtor entry_dtor); | |
f8de50eb KA |
158 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
159 | void put_iova_domain(struct iova_domain *iovad); | |
21aff52a TR |
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 | ||
21aff52a TR |
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 | ||
19282101 JR |
192 | static inline void queue_iova(struct iova_domain *iovad, |
193 | unsigned long pfn, unsigned long pages, | |
194 | unsigned long data) | |
195 | { | |
196 | } | |
197 | ||
21aff52a TR |
198 | static inline unsigned long alloc_iova_fast(struct iova_domain *iovad, |
199 | unsigned long size, | |
538d5b33 TN |
200 | unsigned long limit_pfn, |
201 | bool flush_rcache) | |
21aff52a TR |
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 | ||
21aff52a TR |
213 | static inline void init_iova_domain(struct iova_domain *iovad, |
214 | unsigned long granule, | |
aa3ac946 | 215 | unsigned long start_pfn) |
21aff52a TR |
216 | { |
217 | } | |
218 | ||
42f87e71 JR |
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 | ||
21aff52a TR |
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 | ||
21aff52a | 236 | #endif |
f8de50eb KA |
237 | |
238 | #endif |