1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/init.h>
6 #include <linux/types.h>
7 #include <linux/numa.h>
10 * There is always at least global CMA area and a few optional
11 * areas configured in kernel .config.
13 #ifdef CONFIG_CMA_AREAS
14 #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS)
17 #define MAX_CMA_AREAS (0)
21 #define CMA_MAX_NAME 64
24 * TODO: once the buddy -- especially pageblock merging and alloc_contig_range()
25 * -- can deal with only some pageblocks of a higher-order page being
26 * MIGRATE_CMA, we can use pageblock_nr_pages.
28 #define CMA_MIN_ALIGNMENT_PAGES MAX_ORDER_NR_PAGES
29 #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
33 extern unsigned long totalcma_pages;
34 extern phys_addr_t cma_get_base(const struct cma *cma);
35 extern unsigned long cma_get_size(const struct cma *cma);
36 extern const char *cma_get_name(const struct cma *cma);
38 extern int __init cma_declare_contiguous_nid(phys_addr_t base,
39 phys_addr_t size, phys_addr_t limit,
40 phys_addr_t alignment, unsigned int order_per_bit,
41 bool fixed, const char *name, struct cma **res_cma,
43 static inline int __init cma_declare_contiguous(phys_addr_t base,
44 phys_addr_t size, phys_addr_t limit,
45 phys_addr_t alignment, unsigned int order_per_bit,
46 bool fixed, const char *name, struct cma **res_cma)
48 return cma_declare_contiguous_nid(base, size, limit, alignment,
49 order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
51 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
52 unsigned int order_per_bit,
54 struct cma **res_cma);
55 extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
57 extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
58 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
60 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
62 extern void cma_reserve_pages_on_error(struct cma *cma);