1/*
2 * memory buffer pool support
3 */
4#ifndef _LINUX_MEMPOOL_H
5#define _LINUX_MEMPOOL_H
6
7#include <linux/wait.h>
8
9struct kmem_cache;
10
11typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
12typedef void (mempool_free_t)(void *element, void *pool_data);
13
14typedef struct mempool_s {
15	spinlock_t lock;
16	int min_nr;		/* nr of elements at *elements */
17	int curr_nr;		/* Current nr of elements at *elements */
18	void **elements;
19
20	void *pool_data;
21	mempool_alloc_t *alloc;
22	mempool_free_t *free;
23	wait_queue_head_t wait;
24} mempool_t;
25
26extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
27			mempool_free_t *free_fn, void *pool_data);
28extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
29			mempool_free_t *free_fn, void *pool_data, int nid);
30
31extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
32extern void mempool_destroy(mempool_t *pool);
33extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
34extern void mempool_free(void *element, mempool_t *pool);
35
36/*
37 * A mempool_alloc_t and mempool_free_t that get the memory from
38 * a slab that is passed in through pool_data.
39 */
40void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
41void mempool_free_slab(void *element, void *pool_data);
42static inline mempool_t *
43mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
44{
45	return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
46			      (void *) kc);
47}
48
49/*
50 * 2 mempool_alloc_t's and a mempool_free_t to kmalloc/kzalloc and kfree
51 * the amount of memory specified by pool_data
52 */
53void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
54void *mempool_kzalloc(gfp_t gfp_mask, void *pool_data);
55void mempool_kfree(void *element, void *pool_data);
56static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
57{
58	return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
59			      (void *) size);
60}
61static inline mempool_t *mempool_create_kzalloc_pool(int min_nr, size_t size)
62{
63	return mempool_create(min_nr, mempool_kzalloc, mempool_kfree,
64			      (void *) size);
65}
66
67/*
68 * A mempool_alloc_t and mempool_free_t for a simple page allocator that
69 * allocates pages of the order specified by pool_data
70 */
71void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
72void mempool_free_pages(void *element, void *pool_data);
73static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
74{
75	return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
76			      (void *)(long)order);
77}
78
79#endif /* _LINUX_MEMPOOL_H */
80