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 8 /* 9 * There is always at least global CMA area and a few optional 10 * areas configured in kernel .config. 11 */ 12 #ifdef CONFIG_CMA_AREAS 13 #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS) 14 15 #else 16 #define MAX_CMA_AREAS (0) 17 18 #endif 19 20 struct cma; 21 22 extern unsigned long totalcma_pages; 23 extern phys_addr_t cma_get_base(const struct cma *cma); 24 extern unsigned long cma_get_size(const struct cma *cma); 25 extern const char *cma_get_name(const struct cma *cma); 26 27 extern int __init cma_declare_contiguous(phys_addr_t base, 28 phys_addr_t size, phys_addr_t limit, 29 phys_addr_t alignment, unsigned int order_per_bit, 30 bool fixed, const char *name, struct cma **res_cma); 31 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, 32 unsigned int order_per_bit, 33 const char *name, 34 struct cma **res_cma); 35 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align, 36 bool no_warn); 37 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count); 38 39 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); 40 #endif 41