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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/mm/cma.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __MM_CMA_H__

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#define __MM_CMA_H__

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#include <linux/debugfs.h>

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#include <linux/kobject.h>

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struct cma_kobject {

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	struct kobject kobj;

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	struct cma *cma;

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};

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/*

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 * Multi-range support. This can be useful if the size of the allocation

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 * is not expected to be larger than the alignment (like with hugetlb_cma),

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 * and the total amount of memory requested, while smaller than the total

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 * amount of memory available, is large enough that it doesn't fit in a

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 * single physical memory range because of memory holes.

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 *

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 * Fields:

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 *   @base_pfn: physical address of range

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 *   @early_pfn: first PFN not reserved through cma_reserve_early

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 *   @count: size of range

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 *   @bitmap: bitmap of allocated (1 << order_per_bit)-sized chunks.

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 */

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struct cma_memrange {

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	unsigned long base_pfn;

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	unsigned long count;

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	union {

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		unsigned long early_pfn;

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		unsigned long *bitmap;

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	};

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#ifdef CONFIG_CMA_DEBUGFS

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	struct debugfs_u32_array dfs_bitmap;

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#endif

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};

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#define CMA_MAX_RANGES 8

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struct cma {

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	unsigned long   count;

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	unsigned long	available_count;

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	unsigned int order_per_bit; /* Order of pages represented by one bit */

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	spinlock_t	lock;

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	struct mutex alloc_mutex;

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#ifdef CONFIG_CMA_DEBUGFS

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	struct hlist_head mem_head;

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	spinlock_t mem_head_lock;

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#endif

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	char name[CMA_MAX_NAME];

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	int nranges;

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	struct cma_memrange ranges[CMA_MAX_RANGES];

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#ifdef CONFIG_CMA_SYSFS

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	/* the number of CMA page successful allocations */

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	atomic64_t nr_pages_succeeded;

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	/* the number of CMA page allocation failures */

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	atomic64_t nr_pages_failed;

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	/* the number of CMA page released */

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	atomic64_t nr_pages_released;

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	/* kobject requires dynamic object */

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	struct cma_kobject *cma_kobj;

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#endif

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	unsigned long flags;

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	/* NUMA node (NUMA_NO_NODE if unspecified) */

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	int nid;

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};

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enum cma_flags {

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	CMA_RESERVE_PAGES_ON_ERROR,

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	CMA_ZONES_VALID,

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	CMA_ZONES_INVALID,

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	CMA_ACTIVATED,

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};

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extern struct cma cma_areas[MAX_CMA_AREAS];

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extern unsigned int cma_area_count;

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static inline unsigned long cma_bitmap_maxno(struct cma *cma,

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		struct cma_memrange *cmr)

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{

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	return cmr->count >> cma->order_per_bit;

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}

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#ifdef CONFIG_CMA_SYSFS

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void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);

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void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);

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void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages);

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#else

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static inline void cma_sysfs_account_success_pages(struct cma *cma,

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						   unsigned long nr_pages) {};

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static inline void cma_sysfs_account_fail_pages(struct cma *cma,

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						unsigned long nr_pages) {};

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static inline void cma_sysfs_account_release_pages(struct cma *cma,

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						   unsigned long nr_pages) {};

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#endif

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#endif

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