projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| a254129e JK |
2 | #ifndef __CMA_H__ |
| 3 | #define __CMA_H__ | |
| 4 | ||
| d5e6eff2 TR |
5 | #include <linux/init.h> |
| 6 | #include <linux/types.h> | |
| 8676af1f | 7 | #include <linux/numa.h> |
| d5e6eff2 | 8 | |
| a254129e JK |
9 | /* |
| 10 | * There is always at least global CMA area and a few optional | |
| 11 | * areas configured in kernel .config. | |
| 12 | */ | |
| 13 | #ifdef CONFIG_CMA_AREAS | |
| 14 | #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS) | |
| 15 | ||
| 16 | #else | |
| 17 | #define MAX_CMA_AREAS (0) | |
| 18 | ||
| 19 | #endif | |
| 20 | ||
| 2281f797 BS |
21 | #define CMA_MAX_NAME 64 |
| 22 | ||
| e16faf26 DH |
23 | /* |
| 24 | * TODO: once the buddy -- especially pageblock merging and alloc_contig_range() | |
| 25 | * -- can deal with only some pageblocks of a higher-order page being | |
| 26 | * MIGRATE_CMA, we can use pageblock_nr_pages. | |
| 27 | */ | |
| b3d40a2b | 28 | #define CMA_MIN_ALIGNMENT_PAGES MAX_ORDER_NR_PAGES |
| e16faf26 DH |
29 | #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES) |
| 30 | ||
| a254129e JK |
31 | struct cma; |
| 32 | ||
| e48322ab | 33 | extern unsigned long totalcma_pages; |
| ac173824 SL |
34 | extern phys_addr_t cma_get_base(const struct cma *cma); |
| 35 | extern unsigned long cma_get_size(const struct cma *cma); | |
| f318dd08 | 36 | extern const char *cma_get_name(const struct cma *cma); |
| a254129e | 37 | |
| 8676af1f | 38 | extern int __init cma_declare_contiguous_nid(phys_addr_t base, |
| dda02fd6 | 39 | phys_addr_t size, phys_addr_t limit, |
| a254129e | 40 | phys_addr_t alignment, unsigned int order_per_bit, |
| 8676af1f AB |
41 | bool fixed, const char *name, struct cma **res_cma, |
| 42 | int nid); | |
| 43 | static inline int __init cma_declare_contiguous(phys_addr_t base, | |
| 44 | phys_addr_t size, phys_addr_t limit, | |
| 45 | phys_addr_t alignment, unsigned int order_per_bit, | |
| 46 | bool fixed, const char *name, struct cma **res_cma) | |
| 47 | { | |
| 48 | return cma_declare_contiguous_nid(base, size, limit, alignment, | |
| 49 | order_per_bit, fixed, name, res_cma, NUMA_NO_NODE); | |
| 50 | } | |
| ac173824 SL |
51 | extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, |
| 52 | unsigned int order_per_bit, | |
| f318dd08 | 53 | const char *name, |
| de9e14ee | 54 | struct cma **res_cma); |
| 78fa5150 | 55 | extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align, |
| 65182029 | 56 | bool no_warn); |
| 9871e2de | 57 | extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count); |
| 78fa5150 | 58 | extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count); |
| e4231bcd LA |
59 | |
| 60 | extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); | |
| 27d121d0 HB |
61 | |
| 62 | extern void cma_reserve_pages_on_error(struct cma *cma); | |
| a254129e | 63 | #endif |