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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
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2#ifndef __MM_CMA_H__
3#define __MM_CMA_H__
4
a2b992c8 5#include <linux/debugfs.h>
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6#include <linux/kobject.h>
7
8struct cma_kobject {
9 struct kobject kobj;
10 struct cma *cma;
11};
a2b992c8 12
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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 */
0ef7dcac 18 spinlock_t lock;
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19#ifdef CONFIG_CMA_DEBUGFS
20 struct hlist_head mem_head;
21 spinlock_t mem_head_lock;
a2b992c8 22 struct debugfs_u32_array dfs_bitmap;
26b02a1f 23#endif
18e98e56 24 char name[CMA_MAX_NAME];
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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 /* kobject requires dynamic object */
31 struct cma_kobject *cma_kobj;
32#endif
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33};
34
35extern struct cma cma_areas[MAX_CMA_AREAS];
36extern unsigned cma_area_count;
37
f21838e0 38static inline unsigned long cma_bitmap_maxno(struct cma *cma)
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39{
40 return cma->count >> cma->order_per_bit;
41}
42
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43#ifdef CONFIG_CMA_SYSFS
44void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);
45void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);
46#else
47static inline void cma_sysfs_account_success_pages(struct cma *cma,
48 unsigned long nr_pages) {};
49static inline void cma_sysfs_account_fail_pages(struct cma *cma,
50 unsigned long nr_pages) {};
51#endif
28b24c1f 52#endif