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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * memory buffer pool support
4 */
5#ifndef _LINUX_MEMPOOL_H
6#define _LINUX_MEMPOOL_H
7
8#include <linux/sched.h>
9#include <linux/alloc_tag.h>
10#include <linux/wait.h>
11#include <linux/compiler.h>
12
13struct kmem_cache;
14
15typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
16typedef void (mempool_free_t)(void *element, void *pool_data);
17
18typedef struct mempool_s {
19 spinlock_t lock;
20 int min_nr; /* nr of elements at *elements */
21 int curr_nr; /* Current nr of elements at *elements */
22 void **elements;
23
24 void *pool_data;
25 mempool_alloc_t *alloc;
26 mempool_free_t *free;
27 wait_queue_head_t wait;
28} mempool_t;
29
30static inline bool mempool_initialized(mempool_t *pool)
31{
32 return pool->elements != NULL;
33}
34
35static inline bool mempool_is_saturated(mempool_t *pool)
36{
37 return READ_ONCE(pool->curr_nr) >= pool->min_nr;
38}
39
40void mempool_exit(mempool_t *pool);
41int mempool_init_node(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
42 mempool_free_t *free_fn, void *pool_data,
43 gfp_t gfp_mask, int node_id);
44
45int mempool_init_noprof(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
46 mempool_free_t *free_fn, void *pool_data);
47#define mempool_init(...) \
48 alloc_hooks(mempool_init_noprof(__VA_ARGS__))
49
50extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
51 mempool_free_t *free_fn, void *pool_data);
52
53extern mempool_t *mempool_create_node_noprof(int min_nr, mempool_alloc_t *alloc_fn,
54 mempool_free_t *free_fn, void *pool_data,
55 gfp_t gfp_mask, int nid);
56#define mempool_create_node(...) \
57 alloc_hooks(mempool_create_node_noprof(__VA_ARGS__))
58
59#define mempool_create(_min_nr, _alloc_fn, _free_fn, _pool_data) \
60 mempool_create_node(_min_nr, _alloc_fn, _free_fn, _pool_data, \
61 GFP_KERNEL, NUMA_NO_NODE)
62
63extern int mempool_resize(mempool_t *pool, int new_min_nr);
64extern void mempool_destroy(mempool_t *pool);
65
66extern void *mempool_alloc_noprof(mempool_t *pool, gfp_t gfp_mask) __malloc;
67#define mempool_alloc(...) \
68 alloc_hooks(mempool_alloc_noprof(__VA_ARGS__))
69
70extern void *mempool_alloc_preallocated(mempool_t *pool) __malloc;
71extern void mempool_free(void *element, mempool_t *pool);
72
73/*
74 * A mempool_alloc_t and mempool_free_t that get the memory from
75 * a slab cache that is passed in through pool_data.
76 * Note: the slab cache may not have a ctor function.
77 */
78void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
79void mempool_free_slab(void *element, void *pool_data);
80
81#define mempool_init_slab_pool(_pool, _min_nr, _kc) \
82 mempool_init(_pool, (_min_nr), mempool_alloc_slab, mempool_free_slab, (void *)(_kc))
83#define mempool_create_slab_pool(_min_nr, _kc) \
84 mempool_create((_min_nr), mempool_alloc_slab, mempool_free_slab, (void *)(_kc))
85
86/*
87 * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
88 * amount of memory specified by pool_data
89 */
90void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
91void mempool_kfree(void *element, void *pool_data);
92
93#define mempool_init_kmalloc_pool(_pool, _min_nr, _size) \
94 mempool_init(_pool, (_min_nr), mempool_kmalloc, mempool_kfree, \
95 (void *)(unsigned long)(_size))
96#define mempool_create_kmalloc_pool(_min_nr, _size) \
97 mempool_create((_min_nr), mempool_kmalloc, mempool_kfree, \
98 (void *)(unsigned long)(_size))
99
100void *mempool_kvmalloc(gfp_t gfp_mask, void *pool_data);
101void mempool_kvfree(void *element, void *pool_data);
102
103static inline int mempool_init_kvmalloc_pool(mempool_t *pool, int min_nr, size_t size)
104{
105 return mempool_init(pool, min_nr, mempool_kvmalloc, mempool_kvfree, (void *) size);
106}
107
108static inline mempool_t *mempool_create_kvmalloc_pool(int min_nr, size_t size)
109{
110 return mempool_create(min_nr, mempool_kvmalloc, mempool_kvfree, (void *) size);
111}
112
113/*
114 * A mempool_alloc_t and mempool_free_t for a simple page allocator that
115 * allocates pages of the order specified by pool_data
116 */
117void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
118void mempool_free_pages(void *element, void *pool_data);
119
120#define mempool_init_page_pool(_pool, _min_nr, _order) \
121 mempool_init(_pool, (_min_nr), mempool_alloc_pages, \
122 mempool_free_pages, (void *)(long)(_order))
123#define mempool_create_page_pool(_min_nr, _order) \
124 mempool_create((_min_nr), mempool_alloc_pages, \
125 mempool_free_pages, (void *)(long)(_order))
126
127#endif /* _LINUX_MEMPOOL_H */