dmapool.h (1832B)
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