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1/* SPDX-License-Identifier: GPL-2.0 */
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 * 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 */
13struct 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
24struct pcpu_chunk {
25#ifdef CONFIG_PERCPU_STATS
26 int nr_alloc; /* # of allocations */
27 size_t max_alloc_size; /* largest allocation size */
28#endif
29
30 struct list_head list; /* linked to pcpu_slot lists */
31 int free_bytes; /* free bytes in the chunk */
32 int contig_bits; /* max contiguous size hint */
33 int contig_bits_start; /* contig_bits starting
34 offset */
35 void *base_addr; /* base address of this chunk */
36
37 unsigned long *alloc_map; /* allocation map */
38 unsigned long *bound_map; /* boundary map */
39 struct pcpu_block_md *md_blocks; /* metadata blocks */
40
41 void *data; /* chunk data */
42 int first_bit; /* no free below this */
43 bool immutable; /* no [de]population allowed */
44 int start_offset; /* the overlap with the previous
45 region to have a page aligned
46 base_addr */
47 int end_offset; /* additional area required to
48 have the region end page
49 aligned */
50
51 int nr_pages; /* # of pages served by this chunk */
52 int nr_populated; /* # of populated pages */
53 int nr_empty_pop_pages; /* # of empty populated pages */
54 unsigned long populated[]; /* populated bitmap */
55};
56
57extern spinlock_t pcpu_lock;
58
59extern struct list_head *pcpu_slot;
60extern int pcpu_nr_slots;
61extern int pcpu_nr_empty_pop_pages;
62
63extern struct pcpu_chunk *pcpu_first_chunk;
64extern struct pcpu_chunk *pcpu_reserved_chunk;
65
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 */
73static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk)
74{
75 return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE;
76}
77
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 */
85static 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 */
97static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk)
98{
99 return pcpu_nr_pages_to_map_bits(chunk->nr_pages);
100}
101
102#ifdef CONFIG_PERCPU_STATS
103
104#include <linux/spinlock.h>
105
106struct 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
117extern struct percpu_stats pcpu_stats;
118extern struct pcpu_alloc_info pcpu_stats_ai;
119
120/*
121 * For debug purposes. We don't care about the flexible array.
122 */
123static 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 */
139static 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 */
163static 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 */
176static inline void pcpu_stats_chunk_alloc(void)
177{
178 unsigned long flags;
179 spin_lock_irqsave(&pcpu_lock, flags);
180
181 pcpu_stats.nr_chunks++;
182 pcpu_stats.nr_max_chunks =
183 max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);
184
185 spin_unlock_irqrestore(&pcpu_lock, flags);
186}
187
188/*
189 * pcpu_stats_chunk_dealloc - decrement chunk stats
190 */
191static inline void pcpu_stats_chunk_dealloc(void)
192{
193 unsigned long flags;
194 spin_lock_irqsave(&pcpu_lock, flags);
195
196 pcpu_stats.nr_chunks--;
197
198 spin_unlock_irqrestore(&pcpu_lock, flags);
199}
200
201#else
202
203static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
204{
205}
206
207static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
208{
209}
210
211static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
212{
213}
214
215static inline void pcpu_stats_chunk_alloc(void)
216{
217}
218
219static inline void pcpu_stats_chunk_dealloc(void)
220{
221}
222
223#endif /* !CONFIG_PERCPU_STATS */
224
225#endif
1/* SPDX-License-Identifier: GPL-2.0 */
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 * There are two chunk types: root and memcg-aware.
10 * Chunks of each type have separate slots list.
11 *
12 * Memcg-aware chunks have an attached vector of obj_cgroup pointers, which is
13 * used to store memcg membership data of a percpu object. Obj_cgroups are
14 * ref-counted pointers to a memory cgroup with an ability to switch dynamically
15 * to the parent memory cgroup. This allows to reclaim a deleted memory cgroup
16 * without reclaiming of all outstanding objects, which hold a reference at it.
17 */
18enum pcpu_chunk_type {
19 PCPU_CHUNK_ROOT,
20#ifdef CONFIG_MEMCG_KMEM
21 PCPU_CHUNK_MEMCG,
22#endif
23 PCPU_NR_CHUNK_TYPES,
24 PCPU_FAIL_ALLOC = PCPU_NR_CHUNK_TYPES
25};
26
27/*
28 * pcpu_block_md is the metadata block struct.
29 * Each chunk's bitmap is split into a number of full blocks.
30 * All units are in terms of bits.
31 *
32 * The scan hint is the largest known contiguous area before the contig hint.
33 * It is not necessarily the actual largest contig hint though. There is an
34 * invariant that the scan_hint_start > contig_hint_start iff
35 * scan_hint == contig_hint. This is necessary because when scanning forward,
36 * we don't know if a new contig hint would be better than the current one.
37 */
38struct pcpu_block_md {
39 int scan_hint; /* scan hint for block */
40 int scan_hint_start; /* block relative starting
41 position of the scan hint */
42 int contig_hint; /* contig hint for block */
43 int contig_hint_start; /* block relative starting
44 position of the contig hint */
45 int left_free; /* size of free space along
46 the left side of the block */
47 int right_free; /* size of free space along
48 the right side of the block */
49 int first_free; /* block position of first free */
50 int nr_bits; /* total bits responsible for */
51};
52
53struct pcpu_chunk {
54#ifdef CONFIG_PERCPU_STATS
55 int nr_alloc; /* # of allocations */
56 size_t max_alloc_size; /* largest allocation size */
57#endif
58
59 struct list_head list; /* linked to pcpu_slot lists */
60 int free_bytes; /* free bytes in the chunk */
61 struct pcpu_block_md chunk_md;
62 void *base_addr; /* base address of this chunk */
63
64 unsigned long *alloc_map; /* allocation map */
65 unsigned long *bound_map; /* boundary map */
66 struct pcpu_block_md *md_blocks; /* metadata blocks */
67
68 void *data; /* chunk data */
69 bool immutable; /* no [de]population allowed */
70 int start_offset; /* the overlap with the previous
71 region to have a page aligned
72 base_addr */
73 int end_offset; /* additional area required to
74 have the region end page
75 aligned */
76#ifdef CONFIG_MEMCG_KMEM
77 struct obj_cgroup **obj_cgroups; /* vector of object cgroups */
78#endif
79
80 int nr_pages; /* # of pages served by this chunk */
81 int nr_populated; /* # of populated pages */
82 int nr_empty_pop_pages; /* # of empty populated pages */
83 unsigned long populated[]; /* populated bitmap */
84};
85
86extern spinlock_t pcpu_lock;
87
88extern struct list_head *pcpu_chunk_lists;
89extern int pcpu_nr_slots;
90extern int pcpu_nr_empty_pop_pages;
91
92extern struct pcpu_chunk *pcpu_first_chunk;
93extern struct pcpu_chunk *pcpu_reserved_chunk;
94
95/**
96 * pcpu_chunk_nr_blocks - converts nr_pages to # of md_blocks
97 * @chunk: chunk of interest
98 *
99 * This conversion is from the number of physical pages that the chunk
100 * serves to the number of bitmap blocks used.
101 */
102static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk)
103{
104 return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE;
105}
106
107/**
108 * pcpu_nr_pages_to_map_bits - converts the pages to size of bitmap
109 * @pages: number of physical pages
110 *
111 * This conversion is from physical pages to the number of bits
112 * required in the bitmap.
113 */
114static inline int pcpu_nr_pages_to_map_bits(int pages)
115{
116 return pages * PAGE_SIZE / PCPU_MIN_ALLOC_SIZE;
117}
118
119/**
120 * pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap
121 * @chunk: chunk of interest
122 *
123 * This conversion is from the number of physical pages that the chunk
124 * serves to the number of bits in the bitmap.
125 */
126static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk)
127{
128 return pcpu_nr_pages_to_map_bits(chunk->nr_pages);
129}
130
131#ifdef CONFIG_MEMCG_KMEM
132static inline enum pcpu_chunk_type pcpu_chunk_type(struct pcpu_chunk *chunk)
133{
134 if (chunk->obj_cgroups)
135 return PCPU_CHUNK_MEMCG;
136 return PCPU_CHUNK_ROOT;
137}
138
139static inline bool pcpu_is_memcg_chunk(enum pcpu_chunk_type chunk_type)
140{
141 return chunk_type == PCPU_CHUNK_MEMCG;
142}
143
144#else
145static inline enum pcpu_chunk_type pcpu_chunk_type(struct pcpu_chunk *chunk)
146{
147 return PCPU_CHUNK_ROOT;
148}
149
150static inline bool pcpu_is_memcg_chunk(enum pcpu_chunk_type chunk_type)
151{
152 return false;
153}
154#endif
155
156static inline struct list_head *pcpu_chunk_list(enum pcpu_chunk_type chunk_type)
157{
158 return &pcpu_chunk_lists[pcpu_nr_slots *
159 pcpu_is_memcg_chunk(chunk_type)];
160}
161
162#ifdef CONFIG_PERCPU_STATS
163
164#include <linux/spinlock.h>
165
166struct percpu_stats {
167 u64 nr_alloc; /* lifetime # of allocations */
168 u64 nr_dealloc; /* lifetime # of deallocations */
169 u64 nr_cur_alloc; /* current # of allocations */
170 u64 nr_max_alloc; /* max # of live allocations */
171 u32 nr_chunks; /* current # of live chunks */
172 u32 nr_max_chunks; /* max # of live chunks */
173 size_t min_alloc_size; /* min allocaiton size */
174 size_t max_alloc_size; /* max allocation size */
175};
176
177extern struct percpu_stats pcpu_stats;
178extern struct pcpu_alloc_info pcpu_stats_ai;
179
180/*
181 * For debug purposes. We don't care about the flexible array.
182 */
183static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
184{
185 memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info));
186
187 /* initialize min_alloc_size to unit_size */
188 pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size;
189}
190
191/*
192 * pcpu_stats_area_alloc - increment area allocation stats
193 * @chunk: the location of the area being allocated
194 * @size: size of area to allocate in bytes
195 *
196 * CONTEXT:
197 * pcpu_lock.
198 */
199static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
200{
201 lockdep_assert_held(&pcpu_lock);
202
203 pcpu_stats.nr_alloc++;
204 pcpu_stats.nr_cur_alloc++;
205 pcpu_stats.nr_max_alloc =
206 max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc);
207 pcpu_stats.min_alloc_size =
208 min(pcpu_stats.min_alloc_size, size);
209 pcpu_stats.max_alloc_size =
210 max(pcpu_stats.max_alloc_size, size);
211
212 chunk->nr_alloc++;
213 chunk->max_alloc_size = max(chunk->max_alloc_size, size);
214}
215
216/*
217 * pcpu_stats_area_dealloc - decrement allocation stats
218 * @chunk: the location of the area being deallocated
219 *
220 * CONTEXT:
221 * pcpu_lock.
222 */
223static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
224{
225 lockdep_assert_held(&pcpu_lock);
226
227 pcpu_stats.nr_dealloc++;
228 pcpu_stats.nr_cur_alloc--;
229
230 chunk->nr_alloc--;
231}
232
233/*
234 * pcpu_stats_chunk_alloc - increment chunk stats
235 */
236static inline void pcpu_stats_chunk_alloc(void)
237{
238 unsigned long flags;
239 spin_lock_irqsave(&pcpu_lock, flags);
240
241 pcpu_stats.nr_chunks++;
242 pcpu_stats.nr_max_chunks =
243 max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);
244
245 spin_unlock_irqrestore(&pcpu_lock, flags);
246}
247
248/*
249 * pcpu_stats_chunk_dealloc - decrement chunk stats
250 */
251static inline void pcpu_stats_chunk_dealloc(void)
252{
253 unsigned long flags;
254 spin_lock_irqsave(&pcpu_lock, flags);
255
256 pcpu_stats.nr_chunks--;
257
258 spin_unlock_irqrestore(&pcpu_lock, flags);
259}
260
261#else
262
263static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
264{
265}
266
267static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
268{
269}
270
271static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
272{
273}
274
275static inline void pcpu_stats_chunk_alloc(void)
276{
277}
278
279static inline void pcpu_stats_chunk_dealloc(void)
280{
281}
282
283#endif /* !CONFIG_PERCPU_STATS */
284
285#endif