1 | /* |
2 | * include/linux/dmapool.h |
3 | * |
4 | * Allocation pools for DMAable (coherent) memory. |
5 | * |
6 | * This file is licensed under the terms of the GNU General Public |
7 | * License version 2. This program is licensed "as is" without any |
8 | * warranty of any kind, whether express or implied. |
9 | */ |
10 | |
11 | #ifndef LINUX_DMAPOOL_H |
12 | #define LINUX_DMAPOOL_H |
13 | |
14 | #include <linux/scatterlist.h> |
15 | #include <asm/io.h> |
16 | |
17 | struct device; |
18 | |
19 | #ifdef CONFIG_HAS_DMA |
20 | |
21 | struct dma_pool *dma_pool_create(const char *name, struct device *dev, |
22 | size_t size, size_t align, size_t allocation); |
23 | |
24 | void dma_pool_destroy(struct dma_pool *pool); |
25 | |
26 | void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, |
27 | dma_addr_t *handle); |
28 | void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr); |
29 | |
30 | /* |
31 | * Managed DMA pool |
32 | */ |
33 | struct dma_pool *dmam_pool_create(const char *name, struct device *dev, |
34 | size_t size, size_t align, size_t allocation); |
35 | void dmam_pool_destroy(struct dma_pool *pool); |
36 | |
37 | #else /* !CONFIG_HAS_DMA */ |
38 | static inline struct dma_pool *dma_pool_create(const char *name, |
39 | struct device *dev, size_t size, size_t align, size_t allocation) |
40 | { return NULL; } |
41 | static inline void dma_pool_destroy(struct dma_pool *pool) { } |
42 | static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, |
43 | dma_addr_t *handle) { return NULL; } |
44 | static inline void dma_pool_free(struct dma_pool *pool, void *vaddr, |
45 | dma_addr_t addr) { } |
46 | static inline struct dma_pool *dmam_pool_create(const char *name, |
47 | struct device *dev, size_t size, size_t align, size_t allocation) |
48 | { return NULL; } |
49 | static inline void dmam_pool_destroy(struct dma_pool *pool) { } |
50 | #endif /* !CONFIG_HAS_DMA */ |
51 | |
52 | static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags, |
53 | dma_addr_t *handle) |
54 | { |
55 | return dma_pool_alloc(pool, mem_flags: mem_flags | __GFP_ZERO, handle); |
56 | } |
57 | |
58 | #endif |
59 | |
60 | |