1
2#ifndef _MM_PERCPU_INTERNAL_H
3#define _MM_PERCPU_INTERNAL_H
4
5#include <linux/types.h>
6#include <linux/percpu.h>
7
8
9
10
11
12
13
14
15
16
17
18
19struct pcpu_block_md {
20 int scan_hint;
21 int scan_hint_start;
22
23 int contig_hint;
24 int contig_hint_start;
25
26 int left_free;
27
28 int right_free;
29
30 int first_free;
31 int nr_bits;
32};
33
34struct pcpu_chunk {
35#ifdef CONFIG_PERCPU_STATS
36 int nr_alloc;
37 size_t max_alloc_size;
38#endif
39
40 struct list_head list;
41 int free_bytes;
42 struct pcpu_block_md chunk_md;
43 void *base_addr;
44
45 unsigned long *alloc_map;
46 unsigned long *bound_map;
47 struct pcpu_block_md *md_blocks;
48
49 void *data;
50 bool immutable;
51 int start_offset;
52
53
54 int end_offset;
55
56
57
58 int nr_pages;
59 int nr_populated;
60 int nr_empty_pop_pages;
61 unsigned long populated[];
62};
63
64extern spinlock_t pcpu_lock;
65
66extern struct list_head *pcpu_slot;
67extern int pcpu_nr_slots;
68extern int pcpu_nr_empty_pop_pages;
69
70extern struct pcpu_chunk *pcpu_first_chunk;
71extern struct pcpu_chunk *pcpu_reserved_chunk;
72
73
74
75
76
77
78
79
80static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk)
81{
82 return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE;
83}
84
85
86
87
88
89
90
91
92static inline int pcpu_nr_pages_to_map_bits(int pages)
93{
94 return pages * PAGE_SIZE / PCPU_MIN_ALLOC_SIZE;
95}
96
97
98
99
100
101
102
103
104static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk)
105{
106 return pcpu_nr_pages_to_map_bits(chunk->nr_pages);
107}
108
109#ifdef CONFIG_PERCPU_STATS
110
111#include <linux/spinlock.h>
112
113struct percpu_stats {
114 u64 nr_alloc;
115 u64 nr_dealloc;
116 u64 nr_cur_alloc;
117 u64 nr_max_alloc;
118 u32 nr_chunks;
119 u32 nr_max_chunks;
120 size_t min_alloc_size;
121 size_t max_alloc_size;
122};
123
124extern struct percpu_stats pcpu_stats;
125extern struct pcpu_alloc_info pcpu_stats_ai;
126
127
128
129
130static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
131{
132 memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info));
133
134
135 pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size;
136}
137
138
139
140
141
142
143
144
145
146static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
147{
148 lockdep_assert_held(&pcpu_lock);
149
150 pcpu_stats.nr_alloc++;
151 pcpu_stats.nr_cur_alloc++;
152 pcpu_stats.nr_max_alloc =
153 max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc);
154 pcpu_stats.min_alloc_size =
155 min(pcpu_stats.min_alloc_size, size);
156 pcpu_stats.max_alloc_size =
157 max(pcpu_stats.max_alloc_size, size);
158
159 chunk->nr_alloc++;
160 chunk->max_alloc_size = max(chunk->max_alloc_size, size);
161}
162
163
164
165
166
167
168
169
170static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
171{
172 lockdep_assert_held(&pcpu_lock);
173
174 pcpu_stats.nr_dealloc++;
175 pcpu_stats.nr_cur_alloc--;
176
177 chunk->nr_alloc--;
178}
179
180
181
182
183static inline void pcpu_stats_chunk_alloc(void)
184{
185 unsigned long flags;
186 spin_lock_irqsave(&pcpu_lock, flags);
187
188 pcpu_stats.nr_chunks++;
189 pcpu_stats.nr_max_chunks =
190 max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);
191
192 spin_unlock_irqrestore(&pcpu_lock, flags);
193}
194
195
196
197
198static inline void pcpu_stats_chunk_dealloc(void)
199{
200 unsigned long flags;
201 spin_lock_irqsave(&pcpu_lock, flags);
202
203 pcpu_stats.nr_chunks--;
204
205 spin_unlock_irqrestore(&pcpu_lock, flags);
206}
207
208#else
209
210static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
211{
212}
213
214static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
215{
216}
217
218static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
219{
220}
221
222static inline void pcpu_stats_chunk_alloc(void)
223{
224}
225
226static inline void pcpu_stats_chunk_dealloc(void)
227{
228}
229
230#endif
231
232#endif
233