Quelle mempool.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* memory buffer pool support
*/
#ifndef _LINUX_MEMPOOL_H
#define _LINUX_MEMPOOL_H

#include <linux/sched.h>
#include <linux/alloc_tag.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;
}

static inline bool mempool_is_saturated(mempool_t *pool)
{
return READ_ONCE(pool->curr_nr) >= pool->min_nr;
}

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_noprof(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
   mempool_free_t *free_fn, void *pool_data);
#define mempool_init(...)      \
alloc_hooks(mempool_init_noprof(__VA_ARGS__))

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_noprof(int min_nr, mempool_alloc_t *alloc_fn,
   mempool_free_t *free_fn, void *pool_data,
   gfp_t gfp_mask, int nid);
#define mempool_create_node(...)     \
alloc_hooks(mempool_create_node_noprof(__VA_ARGS__))

#define mempool_create(_min_nr, _alloc_fn, _free_fn, _pool_data) \
mempool_create_node(_min_nr, _alloc_fn, _free_fn, _pool_data, \
       GFP_KERNEL, NUMA_NO_NODE)

extern int mempool_resize(mempool_t *pool, int new_min_nr);
extern void mempool_destroy(mempool_t *pool);

extern void *mempool_alloc_noprof(mempool_t *pool, gfp_t gfp_mask) __malloc;
#define mempool_alloc(...)      \
alloc_hooks(mempool_alloc_noprof(__VA_ARGS__))

extern void *mempool_alloc_preallocated(mempool_t *pool) __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);

#define mempool_init_slab_pool(_pool, _min_nr, _kc)   \
mempool_init(_pool, (_min_nr), mempool_alloc_slab, mempool_free_slab, (void *)(_kc))
#define mempool_create_slab_pool(_min_nr, _kc)   \
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);

#define mempool_init_kmalloc_pool(_pool, _min_nr, _size)  \
mempool_init(_pool, (_min_nr), mempool_kmalloc, mempool_kfree, \
       (void *)(unsigned long)(_size))
#define mempool_create_kmalloc_pool(_min_nr, _size)   \
mempool_create((_min_nr), mempool_kmalloc, mempool_kfree, \
         (void *)(unsigned long)(_size))

void *mempool_kvmalloc(gfp_t gfp_mask, void *pool_data);
void mempool_kvfree(void *element, void *pool_data);

static inline int mempool_init_kvmalloc_pool(mempool_t *pool, int min_nr, size_t size)
{
return mempool_init(pool, min_nr, mempool_kvmalloc, mempool_kvfree, (void *) size);
}

static inline mempool_t *mempool_create_kvmalloc_pool(int min_nr, size_t size)
{
return mempool_create(min_nr, mempool_kvmalloc, mempool_kvfree, (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);

#define mempool_init_page_pool(_pool, _min_nr, _order)   \
mempool_init(_pool, (_min_nr), mempool_alloc_pages,  \
       mempool_free_pages, (void *)(long)(_order))
#define mempool_create_page_pool(_min_nr, _order)   \
mempool_create((_min_nr), mempool_alloc_pages,   \
         mempool_free_pages, (void *)(long)(_order))

#endif /* _LINUX_MEMPOOL_H */

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