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 /* 14 * Multi-range support. This can be useful if the size of the allocation 15 * is not expected to be larger than the alignment (like with hugetlb_cma), 16 * and the total amount of memory requested, while smaller than the total 17 * amount of memory available, is large enough that it doesn't fit in a 18 * single physical memory range because of memory holes. 19 * 20 * Fields: 21 * @base_pfn: physical address of range 22 * @early_pfn: first PFN not reserved through cma_reserve_early 23 * @count: size of range 24 * @bitmap: bitmap of allocated (1 << order_per_bit)-sized chunks. 25 */ 26 struct cma_memrange { 27 unsigned long base_pfn; 28 unsigned long early_pfn; 29 unsigned long count; 30 unsigned long *bitmap; 31 #ifdef CONFIG_CMA_DEBUGFS 32 struct debugfs_u32_array dfs_bitmap; 33 #endif 34 }; 35 #define CMA_MAX_RANGES 8 36 37 struct cma { 38 unsigned long count; 39 unsigned long available_count; 40 unsigned int order_per_bit; /* Order of pages represented by one bit */ 41 spinlock_t lock; 42 #ifdef CONFIG_CMA_DEBUGFS 43 struct hlist_head mem_head; 44 spinlock_t mem_head_lock; 45 #endif 46 char name[CMA_MAX_NAME]; 47 int nranges; 48 struct cma_memrange ranges[CMA_MAX_RANGES]; 49 #ifdef CONFIG_CMA_SYSFS 50 /* the number of CMA page successful allocations */ 51 atomic64_t nr_pages_succeeded; 52 /* the number of CMA page allocation failures */ 53 atomic64_t nr_pages_failed; 54 /* the number of CMA page released */ 55 atomic64_t nr_pages_released; 56 /* kobject requires dynamic object */ 57 struct cma_kobject *cma_kobj; 58 #endif 59 unsigned long flags; 60 /* NUMA node (NUMA_NO_NODE if unspecified) */ 61 int nid; 62 }; 63 64 enum cma_flags { 65 CMA_RESERVE_PAGES_ON_ERROR, 66 CMA_ZONES_VALID, 67 CMA_ZONES_INVALID, 68 CMA_ACTIVATED, 69 }; 70 71 extern struct cma cma_areas[MAX_CMA_AREAS]; 72 extern unsigned int cma_area_count; 73 74 static inline unsigned long cma_bitmap_maxno(struct cma *cma, 75 struct cma_memrange *cmr) 76 { 77 return cmr->count >> cma->order_per_bit; 78 } 79 80 #ifdef CONFIG_CMA_SYSFS 81 void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages); 82 void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages); 83 void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages); 84 #else 85 static inline void cma_sysfs_account_success_pages(struct cma *cma, 86 unsigned long nr_pages) {}; 87 static inline void cma_sysfs_account_fail_pages(struct cma *cma, 88 unsigned long nr_pages) {}; 89 static inline void cma_sysfs_account_release_pages(struct cma *cma, 90 unsigned long nr_pages) {}; 91 #endif 92 #endif 93