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 __init cma_declare_contiguous_multi(phys_addr_t size, 44 phys_addr_t align, unsigned int order_per_bit, 45 const char *name, struct cma **res_cma, int nid); 46 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, 47 unsigned int order_per_bit, 48 const char *name, 49 struct cma **res_cma); 50 extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align, 51 bool no_warn); 52 extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count); 53 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count); 54 55 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); 56 extern bool cma_intersects(struct cma *cma, unsigned long start, unsigned long end); 57 58 extern void cma_reserve_pages_on_error(struct cma *cma); 59 60 #ifdef CONFIG_CMA 61 struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp); 62 bool cma_free_folio(struct cma *cma, const struct folio *folio); 63 bool cma_validate_zones(struct cma *cma); 64 #else 65 static inline struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp) 66 { 67 return NULL; 68 } 69 70 static inline bool cma_free_folio(struct cma *cma, const struct folio *folio) 71 { 72 return false; 73 } 74 static inline bool cma_validate_zones(struct cma *cma) 75 { 76 return false; 77 } 78 #endif 79 80 #endif 81