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