1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __CMA_H__ 2 #ifndef __CMA_H__
3 #define __CMA_H__ 3 #define __CMA_H__
4 4
5 #include <linux/init.h> 5 #include <linux/init.h>
6 #include <linux/types.h> 6 #include <linux/types.h>
7 #include <linux/numa.h> 7 #include <linux/numa.h>
8 8
>> 9 /*
>> 10 * There is always at least global CMA area and a few optional
>> 11 * areas configured in kernel .config.
>> 12 */
9 #ifdef CONFIG_CMA_AREAS 13 #ifdef CONFIG_CMA_AREAS
10 #define MAX_CMA_AREAS CONFIG_CMA_AREAS !! 14 #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS)
>> 15
>> 16 #else
>> 17 #define MAX_CMA_AREAS (0)
>> 18
11 #endif 19 #endif
12 20
13 #define CMA_MAX_NAME 64 21 #define CMA_MAX_NAME 64
14 22
15 /* 23 /*
16 * the buddy -- especially pageblock merging !! 24 * TODO: once the buddy -- especially pageblock merging and alloc_contig_range()
17 * -- can deal with only some pageblocks of a 25 * -- can deal with only some pageblocks of a higher-order page being
18 * MIGRATE_CMA, we can use pageblock_nr_pages 26 * MIGRATE_CMA, we can use pageblock_nr_pages.
19 */ 27 */
20 #define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_p !! 28 #define CMA_MIN_ALIGNMENT_PAGES max_t(phys_addr_t, MAX_ORDER_NR_PAGES, \
>> 29 pageblock_nr_pages)
21 #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * C 30 #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
22 31
23 struct cma; 32 struct cma;
24 33
25 extern unsigned long totalcma_pages; 34 extern unsigned long totalcma_pages;
26 extern phys_addr_t cma_get_base(const struct c 35 extern phys_addr_t cma_get_base(const struct cma *cma);
27 extern unsigned long cma_get_size(const struct 36 extern unsigned long cma_get_size(const struct cma *cma);
28 extern const char *cma_get_name(const struct c 37 extern const char *cma_get_name(const struct cma *cma);
29 38
30 extern int __init cma_declare_contiguous_nid(p 39 extern int __init cma_declare_contiguous_nid(phys_addr_t base,
31 phys_addr_t size, phys 40 phys_addr_t size, phys_addr_t limit,
32 phys_addr_t alignment, 41 phys_addr_t alignment, unsigned int order_per_bit,
33 bool fixed, const char 42 bool fixed, const char *name, struct cma **res_cma,
34 int nid); 43 int nid);
35 static inline int __init cma_declare_contiguou 44 static inline int __init cma_declare_contiguous(phys_addr_t base,
36 phys_addr_t size, phys 45 phys_addr_t size, phys_addr_t limit,
37 phys_addr_t alignment, 46 phys_addr_t alignment, unsigned int order_per_bit,
38 bool fixed, const char 47 bool fixed, const char *name, struct cma **res_cma)
39 { 48 {
40 return cma_declare_contiguous_nid(base 49 return cma_declare_contiguous_nid(base, size, limit, alignment,
41 order_per_bit, fixed, 50 order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
42 } 51 }
43 extern int cma_init_reserved_mem(phys_addr_t b 52 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
44 unsign 53 unsigned int order_per_bit,
45 const 54 const char *name,
46 struct 55 struct cma **res_cma);
47 extern struct page *cma_alloc(struct cma *cma, 56 extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
48 bool no_warn); 57 bool no_warn);
49 extern bool cma_pages_valid(struct cma *cma, c <<
50 extern bool cma_release(struct cma *cma, const 58 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
51 59
52 extern int cma_for_each_area(int (*it)(struct 60 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
53 <<
54 extern void cma_reserve_pages_on_error(struct <<
55 <<
56 #ifdef CONFIG_CMA <<
57 struct folio *cma_alloc_folio(struct cma *cma, <<
58 bool cma_free_folio(struct cma *cma, const str <<
59 #else <<
60 static inline struct folio *cma_alloc_folio(st <<
61 { <<
62 return NULL; <<
63 } <<
64 <<
65 static inline bool cma_free_folio(struct cma * <<
66 { <<
67 return false; <<
68 } <<
69 #endif <<
70 <<
71 #endif 61 #endif
72 62
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