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, 30 gfp_t gfp_mask, int nid); 31 32 extern int mempool_resize(mempool_t *pool, int new_min_nr); 33 extern void mempool_destroy(mempool_t *pool); 34 extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask); 35 extern void mempool_free(void *element, mempool_t *pool); 36 37 /* 38 * A mempool_alloc_t and mempool_free_t that get the memory from 39 * a slab cache that is passed in through pool_data. 40 * Note: the slab cache may not have a ctor function. 41 */ 42 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data); 43 void mempool_free_slab(void *element, void *pool_data); 44 static inline mempool_t * 45 mempool_create_slab_pool(int min_nr, struct kmem_cache *kc) 46 { 47 return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab, 48 (void *) kc); 49 } 50 51 /* 52 * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the 53 * amount of memory specified by pool_data 54 */ 55 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data); 56 void mempool_kfree(void *element, void *pool_data); 57 static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size) 58 { 59 return mempool_create(min_nr, mempool_kmalloc, mempool_kfree, 60 (void *) size); 61 } 62 63 /* 64 * A mempool_alloc_t and mempool_free_t for a simple page allocator that 65 * allocates pages of the order specified by pool_data 66 */ 67 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data); 68 void mempool_free_pages(void *element, void *pool_data); 69 static inline mempool_t *mempool_create_page_pool(int min_nr, int order) 70 { 71 return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages, 72 (void *)(long)order); 73 } 74 75 #endif /* _LINUX_MEMPOOL_H */ 76