xref: /openbmc/linux/include/linux/cma.h (revision 34bec35c)
1  /* SPDX-License-Identifier: GPL-2.0 */
2  #ifndef __CMA_H__
3  #define __CMA_H__
4  
5  #include <linux/init.h>
6  #include <linux/types.h>
7  #include <linux/numa.h>
8  
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  #endif
16  
17  #define CMA_MAX_NAME 64
18  
19  /*
20   *  the buddy -- especially pageblock merging and alloc_contig_range()
21   * -- can deal with only some pageblocks of a higher-order page being
22   *  MIGRATE_CMA, we can use pageblock_nr_pages.
23   */
24  #define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages
25  #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
26  
27  struct cma;
28  
29  extern unsigned long totalcma_pages;
30  extern phys_addr_t cma_get_base(const struct cma *cma);
31  extern unsigned long cma_get_size(const struct cma *cma);
32  extern const char *cma_get_name(const struct cma *cma);
33  
34  extern int __init cma_declare_contiguous_nid(phys_addr_t base,
35  			phys_addr_t size, phys_addr_t limit,
36  			phys_addr_t alignment, unsigned int order_per_bit,
37  			bool fixed, const char *name, struct cma **res_cma,
38  			int nid);
39  static inline int __init cma_declare_contiguous(phys_addr_t base,
40  			phys_addr_t size, phys_addr_t limit,
41  			phys_addr_t alignment, unsigned int order_per_bit,
42  			bool fixed, const char *name, struct cma **res_cma)
43  {
44  	return cma_declare_contiguous_nid(base, size, limit, alignment,
45  			order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
46  }
47  extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
48  					unsigned int order_per_bit,
49  					const char *name,
50  					struct cma **res_cma);
51  extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
52  			      bool no_warn);
53  extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
54  extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
55  
56  extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
57  
58  extern void cma_reserve_pages_on_error(struct cma *cma);
59  #endif
60