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 | __GFP_ZERO, handle);
56 }
57
58 #endif
59
60
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