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83b6d498d0
Since early_pfn and bitmap are never used at the same time, they can be defined as a union to reduce the size of the data structure. This change can save 8 * u64 entries per CMA. Link: https://lkml.kernel.org/r/20250509083528.1360952-1-hezhongkun.hzk@bytedance.com Signed-off-by: Zhongkun He <hezhongkun.hzk@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* 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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