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#ifdef CONFIG_CMA_AREAS 10#define MAX_CMA_AREAS CONFIG_CMA_AREAS 11#endif 12 13#define CMA_MAX_NAME 64 14 15/* 16 * the buddy -- especially pageblock merging and alloc_contig_range() 17 * -- can deal with only some pageblocks of a higher-order page being 18 * MIGRATE_CMA, we can use pageblock_nr_pages. 19 */ 20#define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages 21#define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES) 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_pages_valid(struct cma *cma, const struct page *pages, unsigned long count); 50extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count); 51 52extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); 53 54extern void cma_reserve_pages_on_error(struct cma *cma); 55#endif 56