LXR linux/include/linux/cma.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __CMA_H__
   3#define __CMA_H__
   4
   5#include <linux/init.h>
   6#include <linux/types.h>
   7
   8/*
   9 * There is always at least global CMA area and a few optional
  10 * areas configured in kernel .config.
  11 */
  12#ifdef CONFIG_CMA_AREAS
  13#define MAX_CMA_AREAS   (1 + CONFIG_CMA_AREAS)
  14
  15#else
  16#define MAX_CMA_AREAS   (0)
  17
  18#endif
  19
  20struct cma;
  21
  22extern unsigned long totalcma_pages;
  23extern phys_addr_t cma_get_base(const struct cma *cma);
  24extern unsigned long cma_get_size(const struct cma *cma);
  25extern const char *cma_get_name(const struct cma *cma);
  26
  27extern int __init cma_declare_contiguous(phys_addr_t base,
  28                        phys_addr_t size, phys_addr_t limit,
  29                        phys_addr_t alignment, unsigned int order_per_bit,
  30                        bool fixed, const char *name, struct cma **res_cma);
  31extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  32                                        unsigned int order_per_bit,
  33                                        const char *name,
  34                                        struct cma **res_cma);
  35extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
  36                              gfp_t gfp_mask);
  37extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
  38
  39extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
  40#endif
  41