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#include <linux/numa.h>
   8
   9/*
  10 * There is always at least global CMA area and a few optional
  11 * areas configured in kernel .config.
  12 */
  13#ifdef CONFIG_CMA_AREAS
  14#define MAX_CMA_AREAS   (1 + CONFIG_CMA_AREAS)
  15
  16#else
  17#define MAX_CMA_AREAS   (0)
  18
  19#endif
  20
  21#define CMA_MAX_NAME 64
  22
  23struct cma;
  24
  25extern unsigned long totalcma_pages;
  26extern phys_addr_t cma_get_base(const struct cma *cma);
  27extern unsigned long cma_get_size(const struct cma *cma);
  28extern const char *cma_get_name(const struct cma *cma);
  29
  30extern int __init cma_declare_contiguous_nid(phys_addr_t base,
  31                        phys_addr_t size, phys_addr_t limit,
  32                        phys_addr_t alignment, unsigned int order_per_bit,
  33                        bool fixed, const char *name, struct cma **res_cma,
  34                        int nid);
  35static inline int __init cma_declare_contiguous(phys_addr_t base,
  36                        phys_addr_t size, phys_addr_t limit,
  37                        phys_addr_t alignment, unsigned int order_per_bit,
  38                        bool fixed, const char *name, struct cma **res_cma)
  39{
  40        return cma_declare_contiguous_nid(base, size, limit, alignment,
  41                        order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
  42}
  43extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  44                                        unsigned int order_per_bit,
  45                                        const char *name,
  46                                        struct cma **res_cma);
  47extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
  48                              bool no_warn);
  49extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
  50
  51extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
  52#endif
  53