projects/linux·blob v5.8-rc4 · refs

59 lines · 1.8 KiB

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
17struct device;
18
19#ifdef CONFIG_HAS_DMA
20
21struct dma_pool *dma_pool_create(const char *name, struct device *dev,
22 size_t size, size_t align, size_t allocation);
23
24void dma_pool_destroy(struct dma_pool *pool);
25
26void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
27 dma_addr_t *handle);
28void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);
29
30/*
31 * Managed DMA pool
32 */
33struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
34 size_t size, size_t align, size_t allocation);
35void dmam_pool_destroy(struct dma_pool *pool);
36
37#else /* !CONFIG_HAS_DMA */
38static 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; }
41static inline void dma_pool_destroy(struct dma_pool *pool) { }
42static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
43 dma_addr_t *handle) { return NULL; }
44static inline void dma_pool_free(struct dma_pool *pool, void *vaddr,
45 dma_addr_t addr) { }
46static 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; }
49static inline void dmam_pool_destroy(struct dma_pool *pool) { }
50#endif /* !CONFIG_HAS_DMA */
51
52static 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