LXR linux/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
  19struct cma;
  20
  21extern unsigned long totalcma_pages;
  22extern phys_addr_t cma_get_base(const struct cma *cma);
  23extern unsigned long cma_get_size(const struct cma *cma);
  24extern const char *cma_get_name(const struct cma *cma);
  25
  26extern int __init cma_declare_contiguous(phys_addr_t base,
  27                        phys_addr_t size, phys_addr_t limit,
  28                        phys_addr_t alignment, unsigned int order_per_bit,
  29                        bool fixed, const char *name, struct cma **res_cma);
  30extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  31                                        unsigned int order_per_bit,
  32                                        const char *name,
  33                                        struct cma **res_cma);
  34extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
  35                              gfp_t gfp_mask);
  36extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
  37
  38extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
  39#endif
  40