dmapool.h 1.8 KB

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  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. #ifndef LINUX_DMAPOOL_H
  11. #define LINUX_DMAPOOL_H
  12. #include <linux/scatterlist.h>
  13. #include <asm/io.h>
  14. struct device;
  15. #ifdef CONFIG_HAS_DMA
  16. struct dma_pool *dma_pool_create(const char *name, struct device *dev,
  17. size_t size, size_t align, size_t allocation);
  18. void dma_pool_destroy(struct dma_pool *pool);
  19. void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
  20. dma_addr_t *handle);
  21. void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);
  22. /*
  23. * Managed DMA pool
  24. */
  25. struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
  26. size_t size, size_t align, size_t allocation);
  27. void dmam_pool_destroy(struct dma_pool *pool);
  28. #else /* !CONFIG_HAS_DMA */
  29. static inline struct dma_pool *dma_pool_create(const char *name,
  30. struct device *dev, size_t size, size_t align, size_t allocation)
  31. { return NULL; }
  32. static inline void dma_pool_destroy(struct dma_pool *pool) { }
  33. static inline void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
  34. dma_addr_t *handle) { return NULL; }
  35. static inline void dma_pool_free(struct dma_pool *pool, void *vaddr,
  36. dma_addr_t addr) { }
  37. static inline struct dma_pool *dmam_pool_create(const char *name,
  38. struct device *dev, size_t size, size_t align, size_t allocation)
  39. { return NULL; }
  40. static inline void dmam_pool_destroy(struct dma_pool *pool) { }
  41. #endif /* !CONFIG_HAS_DMA */
  42. static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
  43. dma_addr_t *handle)
  44. {
  45. return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle);
  46. }
  47. #endif