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