include/linux/cma.h

   1 #ifndef __CMA_H__
   2 #define __CMA_H__
   3
   4 #include <linux/init.h>
   5 #include <linux/types.h>
   6
   7 /*
   8  * There is always at least global CMA area and a few optional
   9  * areas configured in kernel .config.
  10  */
  11 #ifdef CONFIG_CMA_AREAS
  12 #define MAX_CMA_AREAS   (1 + CONFIG_CMA_AREAS)
  13
  14 #else
  15 #define MAX_CMA_AREAS   (0)
  16
  17 #endif
  18
  19 struct cma;
  20
  21 extern unsigned long totalcma_pages;
  22 extern phys_addr_t cma_get_base(const struct cma *cma);
  23 extern unsigned long cma_get_size(const struct cma *cma);
  24
  25 extern int __init cma_declare_contiguous(phys_addr_t base,
  26                         phys_addr_t size, phys_addr_t limit,
  27                         phys_addr_t alignment, unsigned int order_per_bit,
  28                         bool fixed, struct cma **res_cma);
  29 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  30                                         unsigned int order_per_bit,
  31                                         struct cma **res_cma);
  32 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
  33                               gfp_t gfp_mask);
  34 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
  35 #endif