LCOV - code coverage report
Current view: top level - include/linux - mempool.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 8 8 100.0 %
Date: 2021-04-22 12:43:58 Functions: 0 0 -

          Line data    Source code
       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        8665 : static inline bool mempool_initialized(mempool_t *pool)
      29             : {
      30        8665 :         return pool->elements != NULL;
      31             : }
      32             : 
      33             : void mempool_exit(mempool_t *pool);
      34             : int mempool_init_node(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
      35             :                       mempool_free_t *free_fn, void *pool_data,
      36             :                       gfp_t gfp_mask, int node_id);
      37             : int mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
      38             :                  mempool_free_t *free_fn, void *pool_data);
      39             : 
      40             : extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
      41             :                         mempool_free_t *free_fn, void *pool_data);
      42             : extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
      43             :                         mempool_free_t *free_fn, void *pool_data,
      44             :                         gfp_t gfp_mask, int nid);
      45             : 
      46             : extern int mempool_resize(mempool_t *pool, int new_min_nr);
      47             : extern void mempool_destroy(mempool_t *pool);
      48             : extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc;
      49             : extern void mempool_free(void *element, mempool_t *pool);
      50             : 
      51             : /*
      52             :  * A mempool_alloc_t and mempool_free_t that get the memory from
      53             :  * a slab cache that is passed in through pool_data.
      54             :  * Note: the slab cache may not have a ctor function.
      55             :  */
      56             : void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
      57             : void mempool_free_slab(void *element, void *pool_data);
      58             : 
      59             : static inline int
      60          15 : mempool_init_slab_pool(mempool_t *pool, int min_nr, struct kmem_cache *kc)
      61             : {
      62          15 :         return mempool_init(pool, min_nr, mempool_alloc_slab,
      63             :                             mempool_free_slab, (void *) kc);
      64             : }
      65             : 
      66             : static inline mempool_t *
      67           8 : mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
      68             : {
      69           8 :         return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
      70             :                               (void *) kc);
      71             : }
      72             : 
      73             : /*
      74             :  * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
      75             :  * amount of memory specified by pool_data
      76             :  */
      77             : void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
      78             : void mempool_kfree(void *element, void *pool_data);
      79             : 
      80             : static inline int mempool_init_kmalloc_pool(mempool_t *pool, int min_nr, size_t size)
      81             : {
      82             :         return mempool_init(pool, min_nr, mempool_kmalloc,
      83             :                             mempool_kfree, (void *) size);
      84             : }
      85             : 
      86             : static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
      87             : {
      88             :         return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
      89             :                               (void *) size);
      90             : }
      91             : 
      92             : /*
      93             :  * A mempool_alloc_t and mempool_free_t for a simple page allocator that
      94             :  * allocates pages of the order specified by pool_data
      95             :  */
      96             : void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
      97             : void mempool_free_pages(void *element, void *pool_data);
      98             : 
      99             : static inline int mempool_init_page_pool(mempool_t *pool, int min_nr, int order)
     100             : {
     101             :         return mempool_init(pool, min_nr, mempool_alloc_pages,
     102             :                             mempool_free_pages, (void *)(long)order);
     103             : }
     104             : 
     105           1 : static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
     106             : {
     107           1 :         return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
     108             :                               (void *)(long)order);
     109             : }
     110             : 
     111             : #endif /* _LINUX_MEMPOOL_H */

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