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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 | */ |
17 | struct 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 | */ |
26 | struct 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 | |
35 | extern struct gen_pool *gen_pool_create(int, int); |
36 | extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long); |
37 | extern 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 | */ |
51 | static 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 | } |
56 | extern void gen_pool_destroy(struct gen_pool *); |
57 | extern unsigned long gen_pool_alloc(struct gen_pool *, size_t); |
58 | extern void gen_pool_free(struct gen_pool *, unsigned long, size_t); |
59 | #endif /* __GENALLOC_H__ */ |
60 |
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