| 1 | |
| 2 | * memory buffer pool support
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| 3 |
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| 4 | #ifndef _LINUX_MEMPOOL_H
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| 5 | #define _LINUX_MEMPOOL_H
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| 6 |
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| 7 | #include <linux/wait.h>
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| 8 |
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| 9 | struct kmem_cache;
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| 10 |
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| 11 | typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
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| 12 | typedef void (mempool_free_t)(void *element, void *pool_data);
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| 13 |
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| 14 | typedef struct mempool_s {
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| 15 | spinlock_t lock;
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| 16 | int min_nr;
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| 17 | int curr_nr;
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| 18 | void **elements;
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| 19 |
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| 20 | void *pool_data;
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| 21 | mempool_alloc_t *alloc;
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| 22 | mempool_free_t *free;
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| 23 | wait_queue_head_t wait;
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| 24 | } mempool_t;
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| 25 |
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| 26 | extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
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| 27 | mempool_free_t *free_fn, void *pool_data);
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| 28 | extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
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| 29 | mempool_free_t *free_fn, void *pool_data, int nid);
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| 30 |
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| 31 | extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
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| 32 | extern void mempool_destroy(mempool_t *pool);
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| 33 | extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
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| 34 | extern void mempool_free(void *element, mempool_t *pool);
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| 35 |
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| 36 | |
| 37 | * A mempool_alloc_t and mempool_free_t that get the memory from
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| 38 | * a slab that is passed in through pool_data.
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| 39 |
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| 40 | void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
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| 41 | void mempool_free_slab(void *element, void *pool_data);
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| 42 | static inline mempool_t *
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| 43 | mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
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| 44 | {
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| 45 | return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
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| 46 | (void *) kc);
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| 47 | }
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| 48 |
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| 49 | |
| 50 | * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
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| 51 | * amount of memory specified by pool_data
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| 52 |
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| 53 | void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
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| 54 | void mempool_kfree(void *element, void *pool_data);
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| 55 | static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
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| 56 | {
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| 57 | return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
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| 58 | (void *) size);
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| 59 | }
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| 60 |
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| 61 | |
| 62 | * A mempool_alloc_t and mempool_free_t for a simple page allocator that
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| 63 | * allocates pages of the order specified by pool_data
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| 64 |
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| 65 | void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
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| 66 | void mempool_free_pages(void *element, void *pool_data);
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| 67 | static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
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| 68 | {
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| 69 | return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
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| 70 | (void *)(long)order);
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| 71 | }
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| 72 |
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| 73 | #endif
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