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 16 #else 17 #define MAX_CMA_AREAS (0) 18 19 #endif 20 21 struct cma; 22 23 extern unsigned long totalcma_pages; 24 extern phys_addr_t cma_get_base(const struct cma *cma); 25 extern unsigned long cma_get_size(const struct cma *cma); 26 extern const char *cma_get_name(const struct cma *cma); 27 28 extern int __init cma_declare_contiguous_nid(phys_addr_t base, 29 phys_addr_t size, phys_addr_t limit, 30 phys_addr_t alignment, unsigned int order_per_bit, 31 bool fixed, const char *name, struct cma **res_cma, 32 int nid); 33 static inline int __init cma_declare_contiguous(phys_addr_t base, 34 phys_addr_t size, phys_addr_t limit, 35 phys_addr_t alignment, unsigned int order_per_bit, 36 bool fixed, const char *name, struct cma **res_cma) 37 { 38 return cma_declare_contiguous_nid(base, size, limit, alignment, 39 order_per_bit, fixed, name, res_cma, NUMA_NO_NODE); 40 } 41 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, 42 unsigned int order_per_bit, 43 const char *name, 44 struct cma **res_cma); 45 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align, 46 bool no_warn); 47 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count); 48 49 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); 50 #endif 51