include/linux/dmapool.h

   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