1 /*
2 * memory buffer pool support
3 */
4 #ifndef _LINUX_MEMPOOL_H
5 #define _LINUX_MEMPOOL_H
6
7 #include <linux/wait.h>
8
9 struct kmem_cache;
10
11 typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
12 typedef void (mempool_free_t)(void *element, void *pool_data);
13
14 typedef 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
26 extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
27 mempool_free_t *free_fn, void *pool_data);
28 extern 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
31 extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
32 extern void mempool_destroy(mempool_t *pool);
33 extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
34 extern 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 */
40 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
41 void mempool_free_slab(void *element, void *pool_data);
42 static inline mempool_t *
mempool_create_slab_pool(int min_nr,struct kmem_cache * kc)43 mempool_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 */
53 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
54 void *mempool_kzalloc(gfp_t gfp_mask, void *pool_data);
55 void mempool_kfree(void *element, void *pool_data);
mempool_create_kmalloc_pool(int min_nr,size_t size)56 static 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 }
mempool_create_kzalloc_pool(int min_nr,size_t size)61 static 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 */
71 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
72 void mempool_free_pages(void *element, void *pool_data);
mempool_create_page_pool(int min_nr,int order)73 static 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