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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * memory buffer pool support
3 */
4#ifndef _LINUX_MEMPOOL_H
5#define _LINUX_MEMPOOL_H
6
7#include <linux/wait.h>
8
Matthew Dobsonfec433a2006-03-26 01:37:49 -08009struct kmem_cache;
10
Al Virodd0fc662005-10-07 07:46:04 +010011typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070012typedef 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;
Christoph Lameter19460892005-06-23 00:08:19 -070025
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
Al Virodd0fc662005-10-07 07:46:04 +010031extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032extern void mempool_destroy(mempool_t *pool);
Al Virodd0fc662005-10-07 07:46:04 +010033extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034extern 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 */
Al Virodd0fc662005-10-07 07:46:04 +010040void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041void mempool_free_slab(void *element, void *pool_data);
Matthew Dobsonfec433a2006-03-26 01:37:49 -080042static 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Matthew Dobson6e0678f2006-03-26 01:37:44 -080049/*
Matthew Dobsonf1833232006-03-26 01:37:48 -080050 * 2 mempool_alloc_t's and a mempool_free_t to kmalloc/kzalloc and kfree
51 * the amount of memory specified by pool_data
Matthew Dobson53184082006-03-26 01:37:46 -080052 */
53void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
Matthew Dobsonf1833232006-03-26 01:37:48 -080054void *mempool_kzalloc(gfp_t gfp_mask, void *pool_data);
Matthew Dobson53184082006-03-26 01:37:46 -080055void 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}
Matthew Dobsonf1833232006-03-26 01:37:48 -080061static 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}
Matthew Dobson53184082006-03-26 01:37:46 -080066
67/*
Matthew Dobson6e0678f2006-03-26 01:37:44 -080068 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#endif /* _LINUX_MEMPOOL_H */