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 | /* kobject requires dynamic object */ |
31 | struct cma_kobject *cma_kobj; |
32 | #endif |
33 | bool reserve_pages_on_error; |
34 | }; |
35 | |
36 | extern struct cma cma_areas[MAX_CMA_AREAS]; |
37 | extern unsigned cma_area_count; |
38 | |
39 | static inline unsigned long cma_bitmap_maxno(struct cma *cma) |
40 | { |
41 | return cma->count >> cma->order_per_bit; |
42 | } |
43 | |
44 | #ifdef CONFIG_CMA_SYSFS |
45 | void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages); |
46 | void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages); |
47 | #else |
48 | static inline void cma_sysfs_account_success_pages(struct cma *cma, |
49 | unsigned long nr_pages) {}; |
50 | static inline void cma_sysfs_account_fail_pages(struct cma *cma, |
51 | unsigned long nr_pages) {}; |
52 | #endif |
53 | #endif |
54 | |