summaryrefslogtreecommitdiffstats
path: root/include/linux/cma.h
blob: bf90f0bb42bd584fa59c1de2b0c04b7e139ae3be (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __CMA_H__
#define __CMA_H__

#include <linux/init.h>
#include <linux/types.h>

/*
 * There is always at least global CMA area and a few optional
 * areas configured in kernel .config.
 */
#ifdef CONFIG_CMA_AREAS
#define MAX_CMA_AREAS	(1 + CONFIG_CMA_AREAS)

#else
#define MAX_CMA_AREAS	(0)

#endif

struct cma;

extern unsigned long totalcma_pages;
extern phys_addr_t cma_get_base(const struct cma *cma);
extern unsigned long cma_get_size(const struct cma *cma);
extern const char *cma_get_name(const struct cma *cma);

extern int __init cma_declare_contiguous(phys_addr_t base,
			phys_addr_t size, phys_addr_t limit,
			phys_addr_t alignment, unsigned int order_per_bit,
			bool fixed, const char *name, struct cma **res_cma);
extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
					unsigned int order_per_bit,
					const char *name,
					struct cma **res_cma);
extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
			      gfp_t gfp_mask);
extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);

extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
#endif
OpenPOWER on IntegriCloud