1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __MM_CMA_H__ 3 #define __MM_CMA_H__ 4 5 #include <linux/debugfs.h> 6 #include <linux/kobject.h> 7 8 struct cma_kobject { 9 struct kobject kobj; 10 struct cma *cma; 11 }; 12 13 struct cma { 14 unsigned long base_pfn; 15 unsigned long count; 16 unsigned long *bitmap; 17 unsigned int order_per_bit; /* Order of pages represented by one bit */ 18 spinlock_t lock; 19 #ifdef CONFIG_CMA_DEBUGFS 20 struct hlist_head mem_head; 21 spinlock_t mem_head_lock; 22 struct debugfs_u32_array dfs_bitmap; 23 #endif 24 char name[CMA_MAX_NAME]; 25 #ifdef CONFIG_CMA_SYSFS 26 /* the number of CMA page successful allocations */ 27 atomic64_t nr_pages_succeeded; 28 /* the number of CMA page allocation failures */ 29 atomic64_t nr_pages_failed; 30 /* the number of CMA page released */ 31 atomic64_t nr_pages_released; 32 /* kobject requires dynamic object */ 33 struct cma_kobject *cma_kobj; 34 #endif 35 bool reserve_pages_on_error; 36 }; 37 38 extern struct cma cma_areas[MAX_CMA_AREAS]; 39 extern unsigned cma_area_count; 40 41 static inline unsigned long cma_bitmap_maxno(struct cma *cma) 42 { 43 return cma->count >> cma->order_per_bit; 44 } 45 46 #ifdef CONFIG_CMA_SYSFS 47 void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages); 48 void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages); 49 void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages); 50 #else 51 static inline void cma_sysfs_account_success_pages(struct cma *cma, 52 unsigned long nr_pages) {}; 53 static inline void cma_sysfs_account_fail_pages(struct cma *cma, 54 unsigned long nr_pages) {}; 55 static inline void cma_sysfs_account_release_pages(struct cma *cma, 56 unsigned long nr_pages) {}; 57 #endif 58 #endif 59