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
7 * This source code is licensed under the GNU General Public License,
8 * Version 2. See the file COPYING for more details.
12 #ifndef __GENALLOC_H__
13 #define __GENALLOC_H__
15 * General purpose special memory pool descriptor.
19 struct list_head chunks; /* list of chunks in this pool */
20 int min_alloc_order; /* minimum allocation order */
24 * General purpose special memory pool chunk descriptor.
26 struct gen_pool_chunk {
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 */
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,
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
47 * Add a new chunk of special memory to the specified pool.
49 * Returns 0 on success or a -ve errno on failure.
51 static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr,
54 return gen_pool_add_virt(pool, addr, -1, size, nid);
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__ */