59 lines · c
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 8struct cma_kobject {9 struct kobject kobj;10 struct cma *cma;11};12 13struct 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_DEBUGFS20 struct hlist_head mem_head;21 spinlock_t mem_head_lock;22 struct debugfs_u32_array dfs_bitmap;23#endif24 char name[CMA_MAX_NAME];25#ifdef CONFIG_CMA_SYSFS26 /* 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#endif35 bool reserve_pages_on_error;36};37 38extern struct cma cma_areas[MAX_CMA_AREAS];39extern unsigned cma_area_count;40 41static inline unsigned long cma_bitmap_maxno(struct cma *cma)42{43 return cma->count >> cma->order_per_bit;44}45 46#ifdef CONFIG_CMA_SYSFS47void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);48void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);49void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages);50#else51static inline void cma_sysfs_account_success_pages(struct cma *cma,52 unsigned long nr_pages) {};53static inline void cma_sysfs_account_fail_pages(struct cma *cma,54 unsigned long nr_pages) {};55static inline void cma_sysfs_account_release_pages(struct cma *cma,56 unsigned long nr_pages) {};57#endif58#endif59