1 #ifndef __CMA_H__ 2 #define __CMA_H__ 3 4 #include <linux/init.h> 5 #include <linux/types.h> 6 7 /* 8 * There is always at least global CMA area and a few optional 9 * areas configured in kernel .config. 10 */ 11 #ifdef CONFIG_CMA_AREAS 12 #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS) 13 14 #else 15 #define MAX_CMA_AREAS (0) 16 17 #endif 18 19 struct cma; 20 21 extern unsigned long totalcma_pages; 22 extern phys_addr_t cma_get_base(const struct cma *cma); 23 extern unsigned long cma_get_size(const struct cma *cma); 24 extern const char *cma_get_name(const struct cma *cma); 25 26 extern int __init cma_declare_contiguous(phys_addr_t base, 27 phys_addr_t size, phys_addr_t limit, 28 phys_addr_t alignment, unsigned int order_per_bit, 29 bool fixed, const char *name, struct cma **res_cma); 30 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, 31 unsigned int order_per_bit, 32 const char *name, 33 struct cma **res_cma); 34 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align, 35 gfp_t gfp_mask); 36 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count); 37 38 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); 39 #endif 40