Root/
1 | /* |
2 | * Basic general purpose allocator for managing special purpose |
3 | * memory, for example, memory that is not managed by the regular |
4 | * kmalloc/kfree interface. Uses for this includes on-device special |
5 | * memory, uncached memory etc. |
6 | * |
7 | * It is safe to use the allocator in NMI handlers and other special |
8 | * unblockable contexts that could otherwise deadlock on locks. This |
9 | * is implemented by using atomic operations and retries on any |
10 | * conflicts. The disadvantage is that there may be livelocks in |
11 | * extreme cases. For better scalability, one allocator can be used |
12 | * for each CPU. |
13 | * |
14 | * The lockless operation only works if there is enough memory |
15 | * available. If new memory is added to the pool a lock has to be |
16 | * still taken. So any user relying on locklessness has to ensure |
17 | * that sufficient memory is preallocated. |
18 | * |
19 | * The basic atomic operation of this allocator is cmpxchg on long. |
20 | * On architectures that don't have NMI-safe cmpxchg implementation, |
21 | * the allocator can NOT be used in NMI handler. So code uses the |
22 | * allocator in NMI handler should depend on |
23 | * CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG. |
24 | * |
25 | * This source code is licensed under the GNU General Public License, |
26 | * Version 2. See the file COPYING for more details. |
27 | */ |
28 | |
29 | |
30 | #ifndef __GENALLOC_H__ |
31 | #define __GENALLOC_H__ |
32 | |
33 | struct device; |
34 | struct device_node; |
35 | |
36 | /** |
37 | * Allocation callback function type definition |
38 | * @map: Pointer to bitmap |
39 | * @size: The bitmap size in bits |
40 | * @start: The bitnumber to start searching at |
41 | * @nr: The number of zeroed bits we're looking for |
42 | * @data: optional additional data used by @genpool_algo_t |
43 | */ |
44 | typedef unsigned long (*genpool_algo_t)(unsigned long *map, |
45 | unsigned long size, |
46 | unsigned long start, |
47 | unsigned int nr, |
48 | void *data); |
49 | |
50 | /* |
51 | * General purpose special memory pool descriptor. |
52 | */ |
53 | struct gen_pool { |
54 | spinlock_t lock; |
55 | struct list_head chunks; /* list of chunks in this pool */ |
56 | int min_alloc_order; /* minimum allocation order */ |
57 | |
58 | genpool_algo_t algo; /* allocation function */ |
59 | void *data; |
60 | }; |
61 | |
62 | /* |
63 | * General purpose special memory pool chunk descriptor. |
64 | */ |
65 | struct gen_pool_chunk { |
66 | struct list_head next_chunk; /* next chunk in pool */ |
67 | atomic_t avail; |
68 | phys_addr_t phys_addr; /* physical starting address of memory chunk */ |
69 | unsigned long start_addr; /* start address of memory chunk */ |
70 | unsigned long end_addr; /* end address of memory chunk (inclusive) */ |
71 | unsigned long bits[0]; /* bitmap for allocating memory chunk */ |
72 | }; |
73 | |
74 | extern struct gen_pool *gen_pool_create(int, int); |
75 | extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long); |
76 | extern int gen_pool_add_virt(struct gen_pool *, unsigned long, phys_addr_t, |
77 | size_t, int); |
78 | /** |
79 | * gen_pool_add - add a new chunk of special memory to the pool |
80 | * @pool: pool to add new memory chunk to |
81 | * @addr: starting address of memory chunk to add to pool |
82 | * @size: size in bytes of the memory chunk to add to pool |
83 | * @nid: node id of the node the chunk structure and bitmap should be |
84 | * allocated on, or -1 |
85 | * |
86 | * Add a new chunk of special memory to the specified pool. |
87 | * |
88 | * Returns 0 on success or a -ve errno on failure. |
89 | */ |
90 | static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr, |
91 | size_t size, int nid) |
92 | { |
93 | return gen_pool_add_virt(pool, addr, -1, size, nid); |
94 | } |
95 | extern void gen_pool_destroy(struct gen_pool *); |
96 | extern unsigned long gen_pool_alloc(struct gen_pool *, size_t); |
97 | extern void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, |
98 | dma_addr_t *dma); |
99 | extern void gen_pool_free(struct gen_pool *, unsigned long, size_t); |
100 | extern void gen_pool_for_each_chunk(struct gen_pool *, |
101 | void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *); |
102 | extern size_t gen_pool_avail(struct gen_pool *); |
103 | extern size_t gen_pool_size(struct gen_pool *); |
104 | |
105 | extern void gen_pool_set_algo(struct gen_pool *pool, genpool_algo_t algo, |
106 | void *data); |
107 | |
108 | extern unsigned long gen_pool_first_fit(unsigned long *map, unsigned long size, |
109 | unsigned long start, unsigned int nr, void *data); |
110 | |
111 | extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size, |
112 | unsigned long start, unsigned int nr, void *data); |
113 | |
114 | extern struct gen_pool *devm_gen_pool_create(struct device *dev, |
115 | int min_alloc_order, int nid); |
116 | extern struct gen_pool *dev_get_gen_pool(struct device *dev); |
117 | |
118 | #ifdef CONFIG_OF |
119 | extern struct gen_pool *of_get_named_gen_pool(struct device_node *np, |
120 | const char *propname, int index); |
121 | #else |
122 | static inline struct gen_pool *of_get_named_gen_pool(struct device_node *np, |
123 | const char *propname, int index) |
124 | { |
125 | return NULL; |
126 | } |
127 | #endif |
128 | #endif /* __GENALLOC_H__ */ |
129 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9