| | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| | 2 | /* |
| | 3 | * memory buffer pool support |
| | 4 | */ |
| | 5 | #ifndef _LINUX_MEMPOOL_H |
| | 6 | #define _LINUX_MEMPOOL_H |
| | 7 | |
| | 8 | #include <linux/wait.h> |
| | 9 | #include <linux/compiler.h> |
| | 10 | |
| | 11 | struct kmem_cache; |
| | 12 | |
| | 13 | typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data); |
| | 14 | typedef void (mempool_free_t)(void *element, void *pool_data); |
| | 15 | |
| | 16 | typedef struct mempool_s { |
| | 17 | spinlock_t lock; |
| | 18 | int min_nr; /* nr of elements at *elements */ |
| | 19 | int curr_nr; /* Current nr of elements at *elements */ |
| | 20 | void **elements; |
| | 21 | |
| | 22 | void *pool_data; |
| | 23 | mempool_alloc_t *alloc; |
| | 24 | mempool_free_t *free; |
| | 25 | wait_queue_head_t wait; |
| | 26 | } mempool_t; |
| | 27 | |
| | 28 | extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn, |
| | 29 | mempool_free_t *free_fn, void *pool_data); |
| | 30 | extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn, |
| | 31 | mempool_free_t *free_fn, void *pool_data, |
| | 32 | gfp_t gfp_mask, int nid); |
| | 33 | |
| | 34 | extern int mempool_resize(mempool_t *pool, int new_min_nr); |
| | 35 | extern void mempool_destroy(mempool_t *pool); |
| | 36 | extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc; |
| | 37 | extern void mempool_free(void *element, mempool_t *pool); |
| | 38 | |
| | 39 | /* |
| | 40 | * A mempool_alloc_t and mempool_free_t that get the memory from |
| | 41 | * a slab cache that is passed in through pool_data. |
| | 42 | * Note: the slab cache may not have a ctor function. |
| | 43 | */ |
| | 44 | void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data); |
| | 45 | void mempool_free_slab(void *element, void *pool_data); |
| | 46 | static inline mempool_t * |
| | 47 | mempool_create_slab_pool(int min_nr, struct kmem_cache *kc) |
| | 48 | { |
| | 49 | return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab, |
| | 50 | (void *) kc); |
| | 51 | } |
| | 52 | |
| | 53 | /* |
| | 54 | * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the |
| | 55 | * amount of memory specified by pool_data |
| | 56 | */ |
| | 57 | void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data); |
| | 58 | void mempool_kfree(void *element, void *pool_data); |
| | 59 | static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size) |
| | 60 | { |
| | 61 | return mempool_create(min_nr, mempool_kmalloc, mempool_kfree, |
| | 62 | (void *) size); |
| | 63 | } |
| | 64 | |
| | 65 | /* |
| | 66 | * A mempool_alloc_t and mempool_free_t for a simple page allocator that |
| | 67 | * allocates pages of the order specified by pool_data |
| | 68 | */ |
| | 69 | void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data); |
| | 70 | void mempool_free_pages(void *element, void *pool_data); |
| | 71 | static inline mempool_t *mempool_create_page_pool(int min_nr, int order) |
| | 72 | { |
| | 73 | return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages, |
| | 74 | (void *)(long)order); |
| | 75 | } |
| | 76 | |
| | 77 | #endif /* _LINUX_MEMPOOL_H */ |
projects / mirror_ubuntu-bionic-kernel.git / blame_incremental