[people/ms/linux.git] / mm / bootmem_info.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Bootmem core functions.
 *
 * Copyright (c) 2020, Bytedance.
 *
 *     Author: Muchun Song <songmuchun@bytedance.com>
 *
 */
#include <linux/mm.h>
#include <linux/compiler.h>
#include <linux/memblock.h>
#include <linux/bootmem_info.h>
#include <linux/memory_hotplug.h>

void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
{
	page->index = type;
	SetPagePrivate(page);
	set_page_private(page, info);
	page_ref_inc(page);
}

void put_page_bootmem(struct page *page)
{
	unsigned long type = page->index;

	BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
	       type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);

	if (page_ref_dec_return(page) == 1) {
		page->index = 0;
		ClearPagePrivate(page);
		set_page_private(page, 0);
		INIT_LIST_HEAD(&page->lru);
		free_reserved_page(page);
	}
}

#ifndef CONFIG_SPARSEMEM_VMEMMAP
static void __init register_page_bootmem_info_section(unsigned long start_pfn)
{
	unsigned long mapsize, section_nr, i;
	struct mem_section *ms;
	struct page *page, *memmap;
	struct mem_section_usage *usage;

	section_nr = pfn_to_section_nr(start_pfn);
	ms = __nr_to_section(section_nr);

	/* Get section's memmap address */
	memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);

	/*
	 * Get page for the memmap's phys address
	 * XXX: need more consideration for sparse_vmemmap...
	 */
	page = virt_to_page(memmap);
	mapsize = sizeof(struct page) * PAGES_PER_SECTION;
	mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;

	/* remember memmap's page */
	for (i = 0; i < mapsize; i++, page++)
		get_page_bootmem(section_nr, page, SECTION_INFO);

	usage = ms->usage;
	page = virt_to_page(usage);

	mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;

	for (i = 0; i < mapsize; i++, page++)
		get_page_bootmem(section_nr, page, MIX_SECTION_INFO);

}
#else /* CONFIG_SPARSEMEM_VMEMMAP */
static void __init register_page_bootmem_info_section(unsigned long start_pfn)
{
	unsigned long mapsize, section_nr, i;
	struct mem_section *ms;
	struct page *page, *memmap;
	struct mem_section_usage *usage;

	section_nr = pfn_to_section_nr(start_pfn);
	ms = __nr_to_section(section_nr);

	memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);

	register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION);

	usage = ms->usage;
	page = virt_to_page(usage);

	mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;

	for (i = 0; i < mapsize; i++, page++)
		get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
}
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */

void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
{
	unsigned long i, pfn, end_pfn, nr_pages;
	int node = pgdat->node_id;
	struct page *page;

	nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
	page = virt_to_page(pgdat);

	for (i = 0; i < nr_pages; i++, page++)
		get_page_bootmem(node, page, NODE_INFO);

	pfn = pgdat->node_start_pfn;
	end_pfn = pgdat_end_pfn(pgdat);

	/* register section info */
	for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
		/*
		 * Some platforms can assign the same pfn to multiple nodes - on
		 * node0 as well as nodeN.  To avoid registering a pfn against
		 * multiple nodes we check that this pfn does not already
		 * reside in some other nodes.
		 */
		if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node))
			register_page_bootmem_info_section(pfn);
	}
}
Commit	Line	Data
426e5c42 MS	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Bootmem core functions.
	4	*
	5	* Copyright (c) 2020, Bytedance.
	6	*
	7	* Author: Muchun Song <songmuchun@bytedance.com>
	8	*
	9	*/
	10	#include <linux/mm.h>
	11	#include <linux/compiler.h>
	12	#include <linux/memblock.h>
	13	#include <linux/bootmem_info.h>
	14	#include <linux/memory_hotplug.h>
	15
	16	void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
	17	{
c5e97ed1	18	page->index = type;
426e5c42 MS	19	SetPagePrivate(page);
	20	set_page_private(page, info);
	21	page_ref_inc(page);
	22	}
	23
	24	void put_page_bootmem(struct page *page)
	25	{
c5e97ed1	26	unsigned long type = page->index;
426e5c42	27
426e5c42 MS	28	BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE \|\|
	29	type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
	30
	31	if (page_ref_dec_return(page) == 1) {
c5e97ed1	32	page->index = 0;
426e5c42 MS	33	ClearPagePrivate(page);
	34	set_page_private(page, 0);
	35	INIT_LIST_HEAD(&page->lru);
	36	free_reserved_page(page);
	37	}
	38	}
	39
	40	#ifndef CONFIG_SPARSEMEM_VMEMMAP
cdcfc631	41	static void __init register_page_bootmem_info_section(unsigned long start_pfn)
426e5c42 MS	42	{
	43	unsigned long mapsize, section_nr, i;
	44	struct mem_section *ms;
	45	struct page page, memmap;
	46	struct mem_section_usage *usage;
	47
	48	section_nr = pfn_to_section_nr(start_pfn);
	49	ms = __nr_to_section(section_nr);
	50
	51	/* Get section's memmap address */
	52	memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
	53
	54	/*
	55	* Get page for the memmap's phys address
	56	* XXX: need more consideration for sparse_vmemmap...
	57	*/
	58	page = virt_to_page(memmap);
	59	mapsize = sizeof(struct page) * PAGES_PER_SECTION;
	60	mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;
	61
	62	/* remember memmap's page */
	63	for (i = 0; i < mapsize; i++, page++)
	64	get_page_bootmem(section_nr, page, SECTION_INFO);
	65
	66	usage = ms->usage;
	67	page = virt_to_page(usage);
	68
	69	mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
	70
	71	for (i = 0; i < mapsize; i++, page++)
	72	get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
	73
	74	}
	75	#else /* CONFIG_SPARSEMEM_VMEMMAP */
cdcfc631	76	static void __init register_page_bootmem_info_section(unsigned long start_pfn)
426e5c42 MS	77	{
	78	unsigned long mapsize, section_nr, i;
	79	struct mem_section *ms;
	80	struct page page, memmap;
	81	struct mem_section_usage *usage;
	82
	83	section_nr = pfn_to_section_nr(start_pfn);
	84	ms = __nr_to_section(section_nr);
	85
	86	memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
	87
	88	register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION);
	89
	90	usage = ms->usage;
	91	page = virt_to_page(usage);
	92
	93	mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
	94
	95	for (i = 0; i < mapsize; i++, page++)
	96	get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
	97	}
	98	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
	99
	100	void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
	101	{
	102	unsigned long i, pfn, end_pfn, nr_pages;
	103	int node = pgdat->node_id;
	104	struct page *page;
	105
	106	nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
	107	page = virt_to_page(pgdat);
	108
	109	for (i = 0; i < nr_pages; i++, page++)
	110	get_page_bootmem(node, page, NODE_INFO);
	111
	112	pfn = pgdat->node_start_pfn;
	113	end_pfn = pgdat_end_pfn(pgdat);
	114
	115	/* register section info */
	116	for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
	117	/*
	118	* Some platforms can assign the same pfn to multiple nodes - on
	119	* node0 as well as nodeN. To avoid registering a pfn against
	120	* multiple nodes we check that this pfn does not already
	121	* reside in some other nodes.
	122	*/
	123	if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node))
	124	register_page_bootmem_info_section(pfn);
	125	}
	126	}