60 строки
2.0 KiB
C
60 строки
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __CMA_H__
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#define __CMA_H__
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/numa.h>
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/*
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* There is always at least global CMA area and a few optional
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* areas configured in kernel .config.
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*/
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#ifdef CONFIG_CMA_AREAS
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#define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS)
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#endif
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#define CMA_MAX_NAME 64
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/*
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* the buddy -- especially pageblock merging and alloc_contig_range()
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* -- can deal with only some pageblocks of a higher-order page being
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* MIGRATE_CMA, we can use pageblock_nr_pages.
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*/
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#define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages
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#define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
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struct cma;
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extern unsigned long totalcma_pages;
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extern phys_addr_t cma_get_base(const struct cma *cma);
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extern unsigned long cma_get_size(const struct cma *cma);
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extern const char *cma_get_name(const struct cma *cma);
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extern int __init cma_declare_contiguous_nid(phys_addr_t base,
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phys_addr_t size, phys_addr_t limit,
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phys_addr_t alignment, unsigned int order_per_bit,
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bool fixed, const char *name, struct cma **res_cma,
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int nid);
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static inline int __init cma_declare_contiguous(phys_addr_t base,
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phys_addr_t size, phys_addr_t limit,
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phys_addr_t alignment, unsigned int order_per_bit,
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bool fixed, const char *name, struct cma **res_cma)
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{
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return cma_declare_contiguous_nid(base, size, limit, alignment,
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order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
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}
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extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
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unsigned int order_per_bit,
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const char *name,
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struct cma **res_cma);
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extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
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bool no_warn);
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extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
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extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
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extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
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extern void cma_reserve_pages_on_error(struct cma *cma);
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#endif
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