diff options
Diffstat (limited to 'mm/cma.h')
| -rw-r--r-- | mm/cma.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/mm/cma.h b/mm/cma.h new file mode 100644 index 000000000..88a059567 --- /dev/null +++ b/mm/cma.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __MM_CMA_H__ +#define __MM_CMA_H__ + +#include <linux/debugfs.h> +#include <linux/kobject.h> + +struct cma_kobject { + struct kobject kobj; + struct cma *cma; +}; + +struct cma { + unsigned long base_pfn; + unsigned long count; + unsigned long *bitmap; + unsigned int order_per_bit; /* Order of pages represented by one bit */ + spinlock_t lock; +#ifdef CONFIG_CMA_DEBUGFS + struct hlist_head mem_head; + spinlock_t mem_head_lock; + struct debugfs_u32_array dfs_bitmap; +#endif + char name[CMA_MAX_NAME]; +#ifdef CONFIG_CMA_SYSFS + /* the number of CMA page successful allocations */ + atomic64_t nr_pages_succeeded; + /* the number of CMA page allocation failures */ + atomic64_t nr_pages_failed; + /* kobject requires dynamic object */ + struct cma_kobject *cma_kobj; +#endif + bool reserve_pages_on_error; +}; + +extern struct cma cma_areas[MAX_CMA_AREAS]; +extern unsigned cma_area_count; + +static inline unsigned long cma_bitmap_maxno(struct cma *cma) +{ + return cma->count >> cma->order_per_bit; +} + +#ifdef CONFIG_CMA_SYSFS +void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages); +void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages); +#else +static inline void cma_sysfs_account_success_pages(struct cma *cma, + unsigned long nr_pages) {}; +static inline void cma_sysfs_account_fail_pages(struct cma *cma, + unsigned long nr_pages) {}; +#endif +#endif |