1 /* 2 * memory buffer pool support 3 */ 4 #ifndef _LINUX_MEMPOOL_H 5 #define _LINUX_MEMPOOL_H 6 7 #include <linux/wait.h> 8 #include <linux/compiler.h> 9 10 struct kmem_cache; 11 12 typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data); 13 typedef void (mempool_free_t)(void *element, void *pool_data); 14 15 typedef struct mempool_s { 16 spinlock_t lock; 17 int min_nr; /* nr of elements at *elements */ 18 int curr_nr; /* Current nr of elements at *elements */ 19 void **elements; 20 21 void *pool_data; 22 mempool_alloc_t *alloc; 23 mempool_free_t *free; 24 wait_queue_head_t wait; 25 } mempool_t; 26 27 extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn, 28 mempool_free_t *free_fn, void *pool_data); 29 extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn, 30 mempool_free_t *free_fn, void *pool_data, 31 gfp_t gfp_mask, int nid); 32 33 extern int mempool_resize(mempool_t *pool, int new_min_nr); 34 extern void mempool_destroy(mempool_t *pool); 35 extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc; 36 extern void mempool_free(void *element, mempool_t *pool); 37 38 /* 39 * A mempool_alloc_t and mempool_free_t that get the memory from 40 * a slab cache that is passed in through pool_data. 41 * Note: the slab cache may not have a ctor function. 42 */ 43 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data); 44 void mempool_free_slab(void *element, void *pool_data); 45 static inline mempool_t * 46 mempool_create_slab_pool(int min_nr, struct kmem_cache *kc) 47 { 48 return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab, 49 (void *) kc); 50 } 51 52 /* 53 * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the 54 * amount of memory specified by pool_data 55 */ 56 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data); 57 void mempool_kfree(void *element, void *pool_data); 58 static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size) 59 { 60 return mempool_create(min_nr, mempool_kmalloc, mempool_kfree, 61 (void *) size); 62 } 63 64 /* 65 * A mempool_alloc_t and mempool_free_t for a simple page allocator that 66 * allocates pages of the order specified by pool_data 67 */ 68 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data); 69 void mempool_free_pages(void *element, void *pool_data); 70 static inline mempool_t *mempool_create_page_pool(int min_nr, int order) 71 { 72 return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages, 73 (void *)(long)order); 74 } 75 76 #endif /* _LINUX_MEMPOOL_H */ 77