60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/*
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* Basic general purpose allocator for managing special purpose memory
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* not managed by the regular kmalloc/kfree interface.
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* Uses for this includes on-device special memory, uncached memory
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* etc.
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#ifndef __GENALLOC_H__
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#define __GENALLOC_H__
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/*
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* General purpose special memory pool descriptor.
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*/
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struct gen_pool {
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rwlock_t lock;
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struct list_head chunks; /* list of chunks in this pool */
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int min_alloc_order; /* minimum allocation order */
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};
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/*
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* General purpose special memory pool chunk descriptor.
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*/
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struct gen_pool_chunk {
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spinlock_t lock;
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struct list_head next_chunk; /* next chunk in pool */
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phys_addr_t phys_addr; /* physical starting address of memory chunk */
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unsigned long start_addr; /* starting address of memory chunk */
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unsigned long end_addr; /* ending address of memory chunk */
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unsigned long bits[0]; /* bitmap for allocating memory chunk */
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};
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extern struct gen_pool *gen_pool_create(int, int);
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extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long);
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extern int gen_pool_add_virt(struct gen_pool *, unsigned long, phys_addr_t,
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size_t, int);
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/**
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* gen_pool_add - add a new chunk of special memory to the pool
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* @pool: pool to add new memory chunk to
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* @addr: starting address of memory chunk to add to pool
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* @size: size in bytes of the memory chunk to add to pool
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* @nid: node id of the node the chunk structure and bitmap should be
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* allocated on, or -1
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*
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* Add a new chunk of special memory to the specified pool.
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*
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* Returns 0 on success or a -ve errno on failure.
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*/
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static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr,
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size_t size, int nid)
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{
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return gen_pool_add_virt(pool, addr, -1, size, nid);
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}
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extern void gen_pool_destroy(struct gen_pool *);
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extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
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extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
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#endif /* __GENALLOC_H__ */
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