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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* vmemmap-optimization.h
*
* Generic vmemmap optimization declarations.
*
* Author: Muchun Song <songmuchun@bytedance.com>
*/
#ifndef _LINUX_VMEMMAP_OPTIMIZATION_H
#define _LINUX_VMEMMAP_OPTIMIZATION_H
#include <linux/align.h>
#include <linux/log2.h>
#include <linux/mmdebug.h>
#include <linux/mmzone.h>
/*
* HugeTLB Vmemmap Optimization (HVO) requires struct pages of the head page to
* be naturally aligned with regard to the folio size.
*
* HVO which is only active if the size of struct page is a power of 2.
*/
#define MAX_FOLIO_VMEMMAP_ALIGN \
(IS_ENABLED(CONFIG_VMEMMAP_OPTIMIZATION) && \
is_power_of_2(sizeof(struct page)) ? \
MAX_FOLIO_NR_PAGES * sizeof(struct page) : 0)
/* The number of retained vmemmap pages with HVO enabled. */
#define VMEMMAP_OPTIMIZATION_PAGES 1
#define VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES \
(VMEMMAP_OPTIMIZATION_PAGES * PAGE_SIZE / sizeof(struct page))
#define VMEMMAP_OPTIMIZATION_MIN_ORDER (ilog2(VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES) + 1)
#ifdef CONFIG_VMEMMAP_OPTIMIZATION
static inline unsigned int section_compound_order(const struct mem_section *section)
{
return section->compound_page_order;
}
static inline void section_set_compound_order(struct mem_section *section,
unsigned int order)
{
VM_WARN_ON(section_compound_order(section) && order &&
section_compound_order(section) != order);
section->compound_page_order = order;
}
static inline void section_set_compound_order_range(unsigned long pfn,
unsigned long nr_pages, unsigned int order)
{
unsigned long section_nr = pfn_to_section_nr(pfn);
if (!IS_ALIGNED(pfn | nr_pages, PAGES_PER_SECTION))
return;
for (unsigned long i = 0; i < nr_pages / PAGES_PER_SECTION; i++)
section_set_compound_order(__nr_to_section(section_nr + i), order);
}
static inline unsigned int pfn_to_section_compound_order(unsigned long pfn)
{
return section_compound_order(__pfn_to_section(pfn));
}
struct page *vmemmap_shared_tail_page(unsigned int order, struct zone *zone);
#else
static inline unsigned int section_compound_order(const struct mem_section *section)
{
return 0;
}
static inline void section_set_compound_order(struct mem_section *section,
unsigned int order)
{
}
static inline void section_set_compound_order_range(unsigned long pfn,
unsigned long nr_pages, unsigned int order)
{
}
static inline unsigned int pfn_to_section_compound_order(unsigned long pfn)
{
return 0;
}
static inline struct page *vmemmap_shared_tail_page(unsigned int order,
struct zone *zone)
{
return NULL;
}
#endif /* CONFIG_VMEMMAP_OPTIMIZATION */
static inline bool vmemmap_optimizable_pfn(unsigned long pfn)
{
const unsigned int order = pfn_to_section_compound_order(pfn);
const unsigned long nr_pages = 1UL << order;
if (!is_power_of_2(sizeof(struct page)))
return false;
return (pfn & (nr_pages - 1)) >= VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES;
}
static inline bool vmemmap_optimizable_order(unsigned int order)
{
if (!IS_ENABLED(CONFIG_VMEMMAP_OPTIMIZATION))
return false;
if (!is_power_of_2(sizeof(struct page)))
return false;
return order >= VMEMMAP_OPTIMIZATION_MIN_ORDER;
}
#endif /* _LINUX_VMEMMAP_OPTIMIZATION_H */
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