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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
8fa3ed80 DZ |
2 | #ifndef _MM_PERCPU_INTERNAL_H |
3 | #define _MM_PERCPU_INTERNAL_H | |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <linux/percpu.h> | |
7 | ||
ca460b3c DZF |
8 | /* |
9 | * pcpu_block_md is the metadata block struct. | |
10 | * Each chunk's bitmap is split into a number of full blocks. | |
11 | * All units are in terms of bits. | |
382b88e9 DZ |
12 | * |
13 | * The scan hint is the largest known contiguous area before the contig hint. | |
14 | * It is not necessarily the actual largest contig hint though. There is an | |
15 | * invariant that the scan_hint_start > contig_hint_start iff | |
16 | * scan_hint == contig_hint. This is necessary because when scanning forward, | |
17 | * we don't know if a new contig hint would be better than the current one. | |
ca460b3c DZF |
18 | */ |
19 | struct pcpu_block_md { | |
382b88e9 DZ |
20 | int scan_hint; /* scan hint for block */ |
21 | int scan_hint_start; /* block relative starting | |
22 | position of the scan hint */ | |
ca460b3c DZF |
23 | int contig_hint; /* contig hint for block */ |
24 | int contig_hint_start; /* block relative starting | |
25 | position of the contig hint */ | |
26 | int left_free; /* size of free space along | |
27 | the left side of the block */ | |
28 | int right_free; /* size of free space along | |
29 | the right side of the block */ | |
30 | int first_free; /* block position of first free */ | |
047924c9 | 31 | int nr_bits; /* total bits responsible for */ |
ca460b3c DZF |
32 | }; |
33 | ||
8fa3ed80 | 34 | struct pcpu_chunk { |
30a5b536 DZ |
35 | #ifdef CONFIG_PERCPU_STATS |
36 | int nr_alloc; /* # of allocations */ | |
37 | size_t max_alloc_size; /* largest allocation size */ | |
38 | #endif | |
39 | ||
8fa3ed80 | 40 | struct list_head list; /* linked to pcpu_slot lists */ |
40064aec | 41 | int free_bytes; /* free bytes in the chunk */ |
92c14cab | 42 | struct pcpu_block_md chunk_md; |
8fa3ed80 DZ |
43 | void *base_addr; /* base address of this chunk */ |
44 | ||
40064aec DZF |
45 | unsigned long *alloc_map; /* allocation map */ |
46 | unsigned long *bound_map; /* boundary map */ | |
ca460b3c | 47 | struct pcpu_block_md *md_blocks; /* metadata blocks */ |
8fa3ed80 DZ |
48 | |
49 | void *data; /* chunk data */ | |
8fa3ed80 | 50 | bool immutable; /* no [de]population allowed */ |
e2266705 DZF |
51 | int start_offset; /* the overlap with the previous |
52 | region to have a page aligned | |
53 | base_addr */ | |
6b9d7c8e DZF |
54 | int end_offset; /* additional area required to |
55 | have the region end page | |
56 | aligned */ | |
c0ebfdc3 DZF |
57 | |
58 | int nr_pages; /* # of pages served by this chunk */ | |
8fa3ed80 | 59 | int nr_populated; /* # of populated pages */ |
0cecf50c | 60 | int nr_empty_pop_pages; /* # of empty populated pages */ |
8fa3ed80 DZ |
61 | unsigned long populated[]; /* populated bitmap */ |
62 | }; | |
63 | ||
64 | extern spinlock_t pcpu_lock; | |
65 | ||
66 | extern struct list_head *pcpu_slot; | |
67 | extern int pcpu_nr_slots; | |
6b9b6f39 | 68 | extern int pcpu_nr_empty_pop_pages; |
8fa3ed80 DZ |
69 | |
70 | extern struct pcpu_chunk *pcpu_first_chunk; | |
71 | extern struct pcpu_chunk *pcpu_reserved_chunk; | |
72 | ||
ca460b3c DZF |
73 | /** |
74 | * pcpu_chunk_nr_blocks - converts nr_pages to # of md_blocks | |
75 | * @chunk: chunk of interest | |
76 | * | |
77 | * This conversion is from the number of physical pages that the chunk | |
78 | * serves to the number of bitmap blocks used. | |
79 | */ | |
80 | static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk) | |
81 | { | |
82 | return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE; | |
83 | } | |
84 | ||
40064aec DZF |
85 | /** |
86 | * pcpu_nr_pages_to_map_bits - converts the pages to size of bitmap | |
87 | * @pages: number of physical pages | |
88 | * | |
89 | * This conversion is from physical pages to the number of bits | |
90 | * required in the bitmap. | |
91 | */ | |
92 | static inline int pcpu_nr_pages_to_map_bits(int pages) | |
93 | { | |
94 | return pages * PAGE_SIZE / PCPU_MIN_ALLOC_SIZE; | |
95 | } | |
96 | ||
97 | /** | |
98 | * pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap | |
99 | * @chunk: chunk of interest | |
100 | * | |
101 | * This conversion is from the number of physical pages that the chunk | |
102 | * serves to the number of bits in the bitmap. | |
103 | */ | |
104 | static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk) | |
105 | { | |
106 | return pcpu_nr_pages_to_map_bits(chunk->nr_pages); | |
107 | } | |
108 | ||
30a5b536 DZ |
109 | #ifdef CONFIG_PERCPU_STATS |
110 | ||
111 | #include <linux/spinlock.h> | |
112 | ||
113 | struct percpu_stats { | |
114 | u64 nr_alloc; /* lifetime # of allocations */ | |
115 | u64 nr_dealloc; /* lifetime # of deallocations */ | |
116 | u64 nr_cur_alloc; /* current # of allocations */ | |
117 | u64 nr_max_alloc; /* max # of live allocations */ | |
118 | u32 nr_chunks; /* current # of live chunks */ | |
119 | u32 nr_max_chunks; /* max # of live chunks */ | |
120 | size_t min_alloc_size; /* min allocaiton size */ | |
121 | size_t max_alloc_size; /* max allocation size */ | |
122 | }; | |
123 | ||
124 | extern struct percpu_stats pcpu_stats; | |
125 | extern struct pcpu_alloc_info pcpu_stats_ai; | |
126 | ||
127 | /* | |
128 | * For debug purposes. We don't care about the flexible array. | |
129 | */ | |
130 | static 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 | /* initialize min_alloc_size to unit_size */ | |
135 | pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size; | |
136 | } | |
137 | ||
138 | /* | |
139 | * pcpu_stats_area_alloc - increment area allocation stats | |
140 | * @chunk: the location of the area being allocated | |
141 | * @size: size of area to allocate in bytes | |
142 | * | |
143 | * CONTEXT: | |
144 | * pcpu_lock. | |
145 | */ | |
146 | static 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 | * pcpu_stats_area_dealloc - decrement allocation stats | |
165 | * @chunk: the location of the area being deallocated | |
166 | * | |
167 | * CONTEXT: | |
168 | * pcpu_lock. | |
169 | */ | |
170 | static 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 | * pcpu_stats_chunk_alloc - increment chunk stats | |
182 | */ | |
183 | static inline void pcpu_stats_chunk_alloc(void) | |
184 | { | |
303abfdf DZ |
185 | unsigned long flags; |
186 | spin_lock_irqsave(&pcpu_lock, flags); | |
30a5b536 DZ |
187 | |
188 | pcpu_stats.nr_chunks++; | |
189 | pcpu_stats.nr_max_chunks = | |
190 | max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks); | |
191 | ||
303abfdf | 192 | spin_unlock_irqrestore(&pcpu_lock, flags); |
30a5b536 DZ |
193 | } |
194 | ||
195 | /* | |
196 | * pcpu_stats_chunk_dealloc - decrement chunk stats | |
197 | */ | |
198 | static inline void pcpu_stats_chunk_dealloc(void) | |
199 | { | |
303abfdf DZ |
200 | unsigned long flags; |
201 | spin_lock_irqsave(&pcpu_lock, flags); | |
30a5b536 DZ |
202 | |
203 | pcpu_stats.nr_chunks--; | |
204 | ||
303abfdf | 205 | spin_unlock_irqrestore(&pcpu_lock, flags); |
30a5b536 DZ |
206 | } |
207 | ||
208 | #else | |
209 | ||
210 | static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai) | |
211 | { | |
212 | } | |
213 | ||
214 | static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size) | |
215 | { | |
216 | } | |
217 | ||
218 | static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk) | |
219 | { | |
220 | } | |
221 | ||
222 | static inline void pcpu_stats_chunk_alloc(void) | |
223 | { | |
224 | } | |
225 | ||
226 | static inline void pcpu_stats_chunk_dealloc(void) | |
227 | { | |
228 | } | |
229 | ||
230 | #endif /* !CONFIG_PERCPU_STATS */ | |
231 | ||
8fa3ed80 | 232 | #endif |