diff options
Diffstat (limited to 'include/linux/mempool.h')
-rw-r--r-- | include/linux/mempool.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/include/linux/mempool.h b/include/linux/mempool.h new file mode 100644 index 000000000..0c964ac10 --- /dev/null +++ b/include/linux/mempool.h @@ -0,0 +1,111 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * memory buffer pool support + */ +#ifndef _LINUX_MEMPOOL_H +#define _LINUX_MEMPOOL_H + +#include <linux/wait.h> +#include <linux/compiler.h> + +struct kmem_cache; + +typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data); +typedef void (mempool_free_t)(void *element, void *pool_data); + +typedef struct mempool_s { + spinlock_t lock; + int min_nr; /* nr of elements at *elements */ + int curr_nr; /* Current nr of elements at *elements */ + void **elements; + + void *pool_data; + mempool_alloc_t *alloc; + mempool_free_t *free; + wait_queue_head_t wait; +} mempool_t; + +static inline bool mempool_initialized(mempool_t *pool) +{ + return pool->elements != NULL; +} + +void mempool_exit(mempool_t *pool); +int mempool_init_node(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn, + mempool_free_t *free_fn, void *pool_data, + gfp_t gfp_mask, int node_id); +int mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn, + mempool_free_t *free_fn, void *pool_data); + +extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn, + mempool_free_t *free_fn, void *pool_data); +extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn, + mempool_free_t *free_fn, void *pool_data, + gfp_t gfp_mask, int nid); + +extern int mempool_resize(mempool_t *pool, int new_min_nr); +extern void mempool_destroy(mempool_t *pool); +extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc; +extern void mempool_free(void *element, mempool_t *pool); + +/* + * A mempool_alloc_t and mempool_free_t that get the memory from + * a slab cache that is passed in through pool_data. + * Note: the slab cache may not have a ctor function. + */ +void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data); +void mempool_free_slab(void *element, void *pool_data); + +static inline int +mempool_init_slab_pool(mempool_t *pool, int min_nr, struct kmem_cache *kc) +{ + return mempool_init(pool, min_nr, mempool_alloc_slab, + mempool_free_slab, (void *) kc); +} + +static inline mempool_t * +mempool_create_slab_pool(int min_nr, struct kmem_cache *kc) +{ + return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab, + (void *) kc); +} + +/* + * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the + * amount of memory specified by pool_data + */ +void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data); +void mempool_kfree(void *element, void *pool_data); + +static inline int mempool_init_kmalloc_pool(mempool_t *pool, int min_nr, size_t size) +{ + return mempool_init(pool, min_nr, mempool_kmalloc, + mempool_kfree, (void *) size); +} + +static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size) +{ + return mempool_create(min_nr, mempool_kmalloc, mempool_kfree, + (void *) size); +} + +/* + * A mempool_alloc_t and mempool_free_t for a simple page allocator that + * allocates pages of the order specified by pool_data + */ +void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data); +void mempool_free_pages(void *element, void *pool_data); + +static inline int mempool_init_page_pool(mempool_t *pool, int min_nr, int order) +{ + return mempool_init(pool, min_nr, mempool_alloc_pages, + mempool_free_pages, (void *)(long)order); +} + +static inline mempool_t *mempool_create_page_pool(int min_nr, int order) +{ + return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages, + (void *)(long)order); +} + +#endif /* _LINUX_MEMPOOL_H */ |