Commit | Line | Data |
---|---|---|
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. | |
12 | */ | |
13 | struct pcpu_block_md { | |
14 | int contig_hint; /* contig hint for block */ | |
15 | int contig_hint_start; /* block relative starting | |
16 | position of the contig hint */ | |
17 | int left_free; /* size of free space along | |
18 | the left side of the block */ | |
19 | int right_free; /* size of free space along | |
20 | the right side of the block */ | |
21 | int first_free; /* block position of first free */ | |
22 | }; | |
23 | ||
8fa3ed80 | 24 | struct pcpu_chunk { |
30a5b536 DZ |
25 | #ifdef CONFIG_PERCPU_STATS |
26 | int nr_alloc; /* # of allocations */ | |
27 | size_t max_alloc_size; /* largest allocation size */ | |
28 | #endif | |
29 | ||
8fa3ed80 | 30 | struct list_head list; /* linked to pcpu_slot lists */ |
40064aec DZF |
31 | int free_bytes; /* free bytes in the chunk */ |
32 | int contig_bits; /* max contiguous size hint */ | |
13f96637 DZF |
33 | int contig_bits_start; /* contig_bits starting |
34 | offset */ | |
8fa3ed80 DZ |
35 | void *base_addr; /* base address of this chunk */ |
36 | ||
40064aec DZF |
37 | unsigned long *alloc_map; /* allocation map */ |
38 | unsigned long *bound_map; /* boundary map */ | |
ca460b3c | 39 | struct pcpu_block_md *md_blocks; /* metadata blocks */ |
8fa3ed80 DZ |
40 | |
41 | void *data; /* chunk data */ | |
86b442fb | 42 | int first_bit; /* no free below this */ |
8fa3ed80 | 43 | bool immutable; /* no [de]population allowed */ |
e2266705 DZF |
44 | int start_offset; /* the overlap with the previous |
45 | region to have a page aligned | |
46 | base_addr */ | |
6b9d7c8e DZF |
47 | int end_offset; /* additional area required to |
48 | have the region end page | |
49 | aligned */ | |
c0ebfdc3 DZF |
50 | |
51 | int nr_pages; /* # of pages served by this chunk */ | |
8fa3ed80 | 52 | int nr_populated; /* # of populated pages */ |
0cecf50c | 53 | int nr_empty_pop_pages; /* # of empty populated pages */ |
8fa3ed80 DZ |
54 | unsigned long populated[]; /* populated bitmap */ |
55 | }; | |
56 | ||
57 | extern spinlock_t pcpu_lock; | |
58 | ||
59 | extern struct list_head *pcpu_slot; | |
60 | extern int pcpu_nr_slots; | |
6b9b6f39 | 61 | extern int pcpu_nr_empty_pop_pages; |
8fa3ed80 DZ |
62 | |
63 | extern struct pcpu_chunk *pcpu_first_chunk; | |
64 | extern struct pcpu_chunk *pcpu_reserved_chunk; | |
65 | ||
ca460b3c DZF |
66 | /** |
67 | * pcpu_chunk_nr_blocks - converts nr_pages to # of md_blocks | |
68 | * @chunk: chunk of interest | |
69 | * | |
70 | * This conversion is from the number of physical pages that the chunk | |
71 | * serves to the number of bitmap blocks used. | |
72 | */ | |
73 | static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk) | |
74 | { | |
75 | return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE; | |
76 | } | |
77 | ||
40064aec DZF |
78 | /** |
79 | * pcpu_nr_pages_to_map_bits - converts the pages to size of bitmap | |
80 | * @pages: number of physical pages | |
81 | * | |
82 | * This conversion is from physical pages to the number of bits | |
83 | * required in the bitmap. | |
84 | */ | |
85 | static inline int pcpu_nr_pages_to_map_bits(int pages) | |
86 | { | |
87 | return pages * PAGE_SIZE / PCPU_MIN_ALLOC_SIZE; | |
88 | } | |
89 | ||
90 | /** | |
91 | * pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap | |
92 | * @chunk: chunk of interest | |
93 | * | |
94 | * This conversion is from the number of physical pages that the chunk | |
95 | * serves to the number of bits in the bitmap. | |
96 | */ | |
97 | static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk) | |
98 | { | |
99 | return pcpu_nr_pages_to_map_bits(chunk->nr_pages); | |
100 | } | |
101 | ||
30a5b536 DZ |
102 | #ifdef CONFIG_PERCPU_STATS |
103 | ||
104 | #include <linux/spinlock.h> | |
105 | ||
106 | struct percpu_stats { | |
107 | u64 nr_alloc; /* lifetime # of allocations */ | |
108 | u64 nr_dealloc; /* lifetime # of deallocations */ | |
109 | u64 nr_cur_alloc; /* current # of allocations */ | |
110 | u64 nr_max_alloc; /* max # of live allocations */ | |
111 | u32 nr_chunks; /* current # of live chunks */ | |
112 | u32 nr_max_chunks; /* max # of live chunks */ | |
113 | size_t min_alloc_size; /* min allocaiton size */ | |
114 | size_t max_alloc_size; /* max allocation size */ | |
115 | }; | |
116 | ||
117 | extern struct percpu_stats pcpu_stats; | |
118 | extern struct pcpu_alloc_info pcpu_stats_ai; | |
119 | ||
120 | /* | |
121 | * For debug purposes. We don't care about the flexible array. | |
122 | */ | |
123 | static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai) | |
124 | { | |
125 | memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info)); | |
126 | ||
127 | /* initialize min_alloc_size to unit_size */ | |
128 | pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size; | |
129 | } | |
130 | ||
131 | /* | |
132 | * pcpu_stats_area_alloc - increment area allocation stats | |
133 | * @chunk: the location of the area being allocated | |
134 | * @size: size of area to allocate in bytes | |
135 | * | |
136 | * CONTEXT: | |
137 | * pcpu_lock. | |
138 | */ | |
139 | static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size) | |
140 | { | |
141 | lockdep_assert_held(&pcpu_lock); | |
142 | ||
143 | pcpu_stats.nr_alloc++; | |
144 | pcpu_stats.nr_cur_alloc++; | |
145 | pcpu_stats.nr_max_alloc = | |
146 | max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc); | |
147 | pcpu_stats.min_alloc_size = | |
148 | min(pcpu_stats.min_alloc_size, size); | |
149 | pcpu_stats.max_alloc_size = | |
150 | max(pcpu_stats.max_alloc_size, size); | |
151 | ||
152 | chunk->nr_alloc++; | |
153 | chunk->max_alloc_size = max(chunk->max_alloc_size, size); | |
154 | } | |
155 | ||
156 | /* | |
157 | * pcpu_stats_area_dealloc - decrement allocation stats | |
158 | * @chunk: the location of the area being deallocated | |
159 | * | |
160 | * CONTEXT: | |
161 | * pcpu_lock. | |
162 | */ | |
163 | static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk) | |
164 | { | |
165 | lockdep_assert_held(&pcpu_lock); | |
166 | ||
167 | pcpu_stats.nr_dealloc++; | |
168 | pcpu_stats.nr_cur_alloc--; | |
169 | ||
170 | chunk->nr_alloc--; | |
171 | } | |
172 | ||
173 | /* | |
174 | * pcpu_stats_chunk_alloc - increment chunk stats | |
175 | */ | |
176 | static inline void pcpu_stats_chunk_alloc(void) | |
177 | { | |
303abfdf DZ |
178 | unsigned long flags; |
179 | spin_lock_irqsave(&pcpu_lock, flags); | |
30a5b536 DZ |
180 | |
181 | pcpu_stats.nr_chunks++; | |
182 | pcpu_stats.nr_max_chunks = | |
183 | max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks); | |
184 | ||
303abfdf | 185 | spin_unlock_irqrestore(&pcpu_lock, flags); |
30a5b536 DZ |
186 | } |
187 | ||
188 | /* | |
189 | * pcpu_stats_chunk_dealloc - decrement chunk stats | |
190 | */ | |
191 | static inline void pcpu_stats_chunk_dealloc(void) | |
192 | { | |
303abfdf DZ |
193 | unsigned long flags; |
194 | spin_lock_irqsave(&pcpu_lock, flags); | |
30a5b536 DZ |
195 | |
196 | pcpu_stats.nr_chunks--; | |
197 | ||
303abfdf | 198 | spin_unlock_irqrestore(&pcpu_lock, flags); |
30a5b536 DZ |
199 | } |
200 | ||
201 | #else | |
202 | ||
203 | static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai) | |
204 | { | |
205 | } | |
206 | ||
207 | static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size) | |
208 | { | |
209 | } | |
210 | ||
211 | static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk) | |
212 | { | |
213 | } | |
214 | ||
215 | static inline void pcpu_stats_chunk_alloc(void) | |
216 | { | |
217 | } | |
218 | ||
219 | static inline void pcpu_stats_chunk_dealloc(void) | |
220 | { | |
221 | } | |
222 | ||
223 | #endif /* !CONFIG_PERCPU_STATS */ | |
224 | ||
8fa3ed80 | 225 | #endif |