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 | |