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1/*
2 * Basic general purpose allocator for managing special purpose memory
3 * not managed by the regular kmalloc/kfree interface.
4 * Uses for this includes on-device special memory, uncached memory
5 * etc.
6 *
7 * This source code is licensed under the GNU General Public License,
8 * Version 2. See the file COPYING for more details.
9 */
10
11
12#ifndef __GENALLOC_H__
13#define __GENALLOC_H__
14/*
15 * General purpose special memory pool descriptor.
16 */
17struct gen_pool {
18 rwlock_t lock;
19 struct list_head chunks; /* list of chunks in this pool */
20 int min_alloc_order; /* minimum allocation order */
21};
22
23/*
24 * General purpose special memory pool chunk descriptor.
25 */
26struct gen_pool_chunk {
27 spinlock_t lock;
28 struct list_head next_chunk; /* next chunk in pool */
29 phys_addr_t phys_addr; /* physical starting address of memory chunk */
30 unsigned long start_addr; /* starting address of memory chunk */
31 unsigned long end_addr; /* ending address of memory chunk */
32 unsigned long bits[0]; /* bitmap for allocating memory chunk */
33};
34
35extern struct gen_pool *gen_pool_create(int, int);
36extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long);
37extern int gen_pool_add_virt(struct gen_pool *, unsigned long, phys_addr_t,
38 size_t, int);
39/**
40 * gen_pool_add - add a new chunk of special memory to the pool
41 * @pool: pool to add new memory chunk to
42 * @addr: starting address of memory chunk to add to pool
43 * @size: size in bytes of the memory chunk to add to pool
44 * @nid: node id of the node the chunk structure and bitmap should be
45 * allocated on, or -1
46 *
47 * Add a new chunk of special memory to the specified pool.
48 *
49 * Returns 0 on success or a -ve errno on failure.
50 */
51static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr,
52 size_t size, int nid)
53{
54 return gen_pool_add_virt(pool, addr, -1, size, nid);
55}
56extern void gen_pool_destroy(struct gen_pool *);
57extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
58extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
59#endif /* __GENALLOC_H__ */