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
  20 struct cma;
  21
  22 extern unsigned long totalcma_pages;
  23 extern phys_addr_t cma_get_base(const struct cma *cma);
  24 extern unsigned long cma_get_size(const struct cma *cma);
  25 extern const char *cma_get_name(const struct cma *cma);
  26
  27 extern 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);
  31 extern 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);
  35 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
  36                               gfp_t gfp_mask);
  37 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
  38
  39 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
  40 #endif