| 1 | /* SPDX-License-Identifier: GPL-2.0 */ | 
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| 2 | #ifndef __CMA_H__ | 
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| 3 | #define __CMA_H__ | 
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| 4 |  | 
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| 5 | #include <linux/init.h> | 
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| 6 | #include <linux/types.h> | 
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| 7 | #include <linux/numa.h> | 
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| 8 |  | 
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| 9 | #ifdef CONFIG_CMA_AREAS | 
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| 10 | #define MAX_CMA_AREAS	CONFIG_CMA_AREAS | 
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| 11 | #endif | 
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| 12 |  | 
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| 13 | #define CMA_MAX_NAME 64 | 
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| 14 |  | 
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| 15 | /* | 
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| 16 | *  the buddy -- especially pageblock merging and alloc_contig_range() | 
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| 17 | * -- can deal with only some pageblocks of a higher-order page being | 
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| 18 | *  MIGRATE_CMA, we can use pageblock_nr_pages. | 
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| 19 | */ | 
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| 20 | #define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages | 
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| 21 | #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES) | 
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| 22 |  | 
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| 23 | struct cma; | 
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| 24 |  | 
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| 25 | extern unsigned long totalcma_pages; | 
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| 26 | extern phys_addr_t cma_get_base(const struct cma *cma); | 
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| 27 | extern unsigned long cma_get_size(const struct cma *cma); | 
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| 28 | extern const char *cma_get_name(const struct cma *cma); | 
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| 29 |  | 
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| 30 | extern int __init cma_declare_contiguous_nid(phys_addr_t base, | 
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| 31 | phys_addr_t size, phys_addr_t limit, | 
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| 32 | phys_addr_t alignment, unsigned int order_per_bit, | 
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| 33 | bool fixed, const char *name, struct cma **res_cma, | 
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| 34 | int nid); | 
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| 35 | static inline int __init cma_declare_contiguous(phys_addr_t base, | 
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| 36 | phys_addr_t size, phys_addr_t limit, | 
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| 37 | phys_addr_t alignment, unsigned int order_per_bit, | 
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| 38 | bool fixed, const char *name, struct cma **res_cma) | 
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| 39 | { | 
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| 40 | return cma_declare_contiguous_nid(base, size, limit, alignment, | 
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| 41 | order_per_bit, fixed, name, res_cma, NUMA_NO_NODE); | 
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| 42 | } | 
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| 43 | extern int __init cma_declare_contiguous_multi(phys_addr_t size, | 
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| 44 | phys_addr_t align, unsigned int order_per_bit, | 
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| 45 | const char *name, struct cma **res_cma, int nid); | 
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| 46 | extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, | 
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| 47 | unsigned int order_per_bit, | 
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| 48 | const char *name, | 
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| 49 | struct cma **res_cma); | 
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| 50 | extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align, | 
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| 51 | bool no_warn); | 
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| 52 | extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count); | 
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| 53 | extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count); | 
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| 54 |  | 
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| 55 | extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); | 
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| 56 | extern bool cma_intersects(struct cma *cma, unsigned long start, unsigned long end); | 
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| 57 |  | 
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| 58 | extern void cma_reserve_pages_on_error(struct cma *cma); | 
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| 59 |  | 
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| 60 | #ifdef CONFIG_CMA | 
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| 61 | struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp); | 
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| 62 | bool cma_free_folio(struct cma *cma, const struct folio *folio); | 
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| 63 | bool cma_validate_zones(struct cma *cma); | 
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| 64 | #else | 
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| 65 | static inline struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp) | 
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| 66 | { | 
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| 67 | return NULL; | 
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| 68 | } | 
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| 69 |  | 
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| 70 | static inline bool cma_free_folio(struct cma *cma, const struct folio *folio) | 
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| 71 | { | 
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| 72 | return false; | 
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| 73 | } | 
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| 74 | static inline bool cma_validate_zones(struct cma *cma) | 
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| 75 | { | 
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| 76 | return false; | 
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| 77 | } | 
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| 78 | #endif | 
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| 79 |  | 
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| 80 | #endif | 
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| 81 |  | 
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