131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* memory buffer pool support
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*/
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#ifndef _LINUX_MEMPOOL_H
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#define _LINUX_MEMPOOL_H
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#include <linux/sched.h>
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#include <linux/alloc_tag.h>
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#include <linux/wait.h>
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#include <linux/compiler.h>
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struct kmem_cache;
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typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
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typedef void (mempool_free_t)(void *element, void *pool_data);
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typedef struct mempool_s {
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spinlock_t lock;
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int min_nr; /* nr of elements at *elements */
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int curr_nr; /* Current nr of elements at *elements */
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void **elements;
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void *pool_data;
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mempool_alloc_t *alloc;
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mempool_free_t *free;
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wait_queue_head_t wait;
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RH_KABI_RESERVE(1)
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RH_KABI_RESERVE(2)
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RH_KABI_RESERVE(3)
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} mempool_t;
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static inline bool mempool_initialized(mempool_t *pool)
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{
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return pool->elements != NULL;
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}
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static inline bool mempool_is_saturated(mempool_t *pool)
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{
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return READ_ONCE(pool->curr_nr) >= pool->min_nr;
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}
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void mempool_exit(mempool_t *pool);
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int mempool_init_node(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
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mempool_free_t *free_fn, void *pool_data,
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gfp_t gfp_mask, int node_id);
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int mempool_init_noprof(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
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mempool_free_t *free_fn, void *pool_data);
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#define mempool_init(...) \
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alloc_hooks(mempool_init_noprof(__VA_ARGS__))
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extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
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mempool_free_t *free_fn, void *pool_data);
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extern mempool_t *mempool_create_node_noprof(int min_nr, mempool_alloc_t *alloc_fn,
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mempool_free_t *free_fn, void *pool_data,
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gfp_t gfp_mask, int nid);
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#define mempool_create_node(...) \
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alloc_hooks(mempool_create_node_noprof(__VA_ARGS__))
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#define mempool_create(_min_nr, _alloc_fn, _free_fn, _pool_data) \
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mempool_create_node(_min_nr, _alloc_fn, _free_fn, _pool_data, \
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GFP_KERNEL, NUMA_NO_NODE)
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extern int mempool_resize(mempool_t *pool, int new_min_nr);
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extern void mempool_destroy(mempool_t *pool);
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extern void *mempool_alloc_noprof(mempool_t *pool, gfp_t gfp_mask) __malloc;
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#define mempool_alloc(...) \
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alloc_hooks(mempool_alloc_noprof(__VA_ARGS__))
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extern void *mempool_alloc_preallocated(mempool_t *pool) __malloc;
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extern void mempool_free(void *element, mempool_t *pool);
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/*
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* A mempool_alloc_t and mempool_free_t that get the memory from
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* a slab cache that is passed in through pool_data.
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* Note: the slab cache may not have a ctor function.
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*/
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void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
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void mempool_free_slab(void *element, void *pool_data);
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#define mempool_init_slab_pool(_pool, _min_nr, _kc) \
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mempool_init(_pool, (_min_nr), mempool_alloc_slab, mempool_free_slab, (void *)(_kc))
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#define mempool_create_slab_pool(_min_nr, _kc) \
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mempool_create((_min_nr), mempool_alloc_slab, mempool_free_slab, (void *)(_kc))
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/*
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* a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
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* amount of memory specified by pool_data
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*/
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void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
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void mempool_kfree(void *element, void *pool_data);
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#define mempool_init_kmalloc_pool(_pool, _min_nr, _size) \
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mempool_init(_pool, (_min_nr), mempool_kmalloc, mempool_kfree, \
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(void *)(unsigned long)(_size))
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#define mempool_create_kmalloc_pool(_min_nr, _size) \
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mempool_create((_min_nr), mempool_kmalloc, mempool_kfree, \
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(void *)(unsigned long)(_size))
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void *mempool_kvmalloc(gfp_t gfp_mask, void *pool_data);
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void mempool_kvfree(void *element, void *pool_data);
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static inline int mempool_init_kvmalloc_pool(mempool_t *pool, int min_nr, size_t size)
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{
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return mempool_init(pool, min_nr, mempool_kvmalloc, mempool_kvfree, (void *) size);
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}
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static inline mempool_t *mempool_create_kvmalloc_pool(int min_nr, size_t size)
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{
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return mempool_create(min_nr, mempool_kvmalloc, mempool_kvfree, (void *) size);
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}
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/*
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* A mempool_alloc_t and mempool_free_t for a simple page allocator that
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* allocates pages of the order specified by pool_data
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*/
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void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
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void mempool_free_pages(void *element, void *pool_data);
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#define mempool_init_page_pool(_pool, _min_nr, _order) \
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mempool_init(_pool, (_min_nr), mempool_alloc_pages, \
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mempool_free_pages, (void *)(long)(_order))
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#define mempool_create_page_pool(_min_nr, _order) \
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mempool_create((_min_nr), mempool_alloc_pages, \
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mempool_free_pages, (void *)(long)(_order))
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#endif /* _LINUX_MEMPOOL_H */
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