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dmapool.h
/* * include/linux/dmapool.h * * Allocation pools for DMAable (coherent) memory. * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #ifndef LINUX_DMAPOOL_H #define LINUX_DMAPOOL_H #include <linux/scatterlist.h> #include <asm/io.h> struct device; #ifdef CONFIG_HAS_DMA struct dma_pool *dma_pool_create(const char *name, struct device *dev, size_t size, size_t align, size_t allocation); void dma_pool_destroy(struct dma_pool *pool); void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle); void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr); /* * Managed DMA pool */ struct dma_pool *dmam_pool_create(const char *name, struct device *dev, size_t size, size_t align, size_t allocation); void dmam_pool_destroy(struct dma_pool *pool); #else /* !CONFIG_HAS_DMA */ static inline struct dma_pool *dma_pool_create(const char *name, struct device *dev, size_t size, size_t align, size_t allocation) { return NULL; } static inline void dma_pool_destroy(struct dma_pool *pool) { } static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle) { return NULL; } static inline void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr) { } static inline struct dma_pool *dmam_pool_create(const char *name, struct device *dev, size_t size, size_t align, size_t allocation) { return NULL; } static inline void dmam_pool_destroy(struct dma_pool *pool) { } #endif /* !CONFIG_HAS_DMA */ static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle) { return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle); } #endif