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 | /* |
10 | * There is always at least global CMA area and a few optional |
11 | * areas configured in kernel .config. |
12 | */ |
13 | #ifdef CONFIG_CMA_AREAS |
14 | #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS) |
15 | #endif |
16 | |
17 | #define CMA_MAX_NAME 64 |
18 | |
19 | /* |
20 | * the buddy -- especially pageblock merging and alloc_contig_range() |
21 | * -- can deal with only some pageblocks of a higher-order page being |
22 | * MIGRATE_CMA, we can use pageblock_nr_pages. |
23 | */ |
24 | #define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages |
25 | #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES) |
26 | |
27 | struct cma; |
28 | |
29 | extern unsigned long totalcma_pages; |
30 | extern phys_addr_t cma_get_base(const struct cma *cma); |
31 | extern unsigned long cma_get_size(const struct cma *cma); |
32 | extern const char *cma_get_name(const struct cma *cma); |
33 | |
34 | extern int __init cma_declare_contiguous_nid(phys_addr_t base, |
35 | phys_addr_t size, phys_addr_t limit, |
36 | phys_addr_t alignment, unsigned int order_per_bit, |
37 | bool fixed, const char *name, struct cma **res_cma, |
38 | int nid); |
39 | static inline int __init cma_declare_contiguous(phys_addr_t base, |
40 | phys_addr_t size, phys_addr_t limit, |
41 | phys_addr_t alignment, unsigned int order_per_bit, |
42 | bool fixed, const char *name, struct cma **res_cma) |
43 | { |
44 | return cma_declare_contiguous_nid(base, size, limit, alignment, |
45 | order_per_bit, fixed, name, res_cma, NUMA_NO_NODE); |
46 | } |
47 | extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, |
48 | unsigned int order_per_bit, |
49 | const char *name, |
50 | struct cma **res_cma); |
51 | extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align, |
52 | bool no_warn); |
53 | extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count); |
54 | extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count); |
55 | |
56 | extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); |
57 | |
58 | extern void cma_reserve_pages_on_error(struct cma *cma); |
59 | #endif |
60 | |