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 			      bool no_warn);
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
41