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
23 struct cma;
24
25 extern unsigned long totalcma_pages;
26 extern phys_addr_t cma_get_base(const struct cma *cma);
27 extern unsigned long cma_get_size(const struct cma *cma);
28 extern const char *cma_get_name(const struct cma *cma);
29
30 extern 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);
35 static 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 }
43 extern 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);
47 extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
48 bool no_warn);
49 extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
50 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
51
52 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
53
54 extern void cma_reserve_pages_on_error(struct cma *cma);
55 #endif
56
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