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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.