128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Bootmem core functions.
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*
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* Copyright (c) 2020, Bytedance.
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*
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* Author: Muchun Song <songmuchun@bytedance.com>
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*
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*/
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#include <linux/mm.h>
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#include <linux/compiler.h>
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#include <linux/memblock.h>
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#include <linux/bootmem_info.h>
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#include <linux/memory_hotplug.h>
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void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
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{
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page->freelist = (void *)type;
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SetPagePrivate(page);
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set_page_private(page, info);
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page_ref_inc(page);
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}
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void put_page_bootmem(struct page *page)
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{
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unsigned long type;
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type = (unsigned long) page->freelist;
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BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
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type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
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if (page_ref_dec_return(page) == 1) {
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page->freelist = NULL;
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ClearPagePrivate(page);
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set_page_private(page, 0);
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INIT_LIST_HEAD(&page->lru);
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free_reserved_page(page);
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}
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}
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#ifndef CONFIG_SPARSEMEM_VMEMMAP
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static void register_page_bootmem_info_section(unsigned long start_pfn)
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{
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unsigned long mapsize, section_nr, i;
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struct mem_section *ms;
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struct page *page, *memmap;
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struct mem_section_usage *usage;
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section_nr = pfn_to_section_nr(start_pfn);
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ms = __nr_to_section(section_nr);
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/* Get section's memmap address */
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memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
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/*
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* Get page for the memmap's phys address
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* XXX: need more consideration for sparse_vmemmap...
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*/
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page = virt_to_page(memmap);
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mapsize = sizeof(struct page) * PAGES_PER_SECTION;
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mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;
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/* remember memmap's page */
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for (i = 0; i < mapsize; i++, page++)
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get_page_bootmem(section_nr, page, SECTION_INFO);
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usage = ms->usage;
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page = virt_to_page(usage);
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mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
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for (i = 0; i < mapsize; i++, page++)
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get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
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}
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#else /* CONFIG_SPARSEMEM_VMEMMAP */
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static void register_page_bootmem_info_section(unsigned long start_pfn)
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{
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unsigned long mapsize, section_nr, i;
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struct mem_section *ms;
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struct page *page, *memmap;
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struct mem_section_usage *usage;
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section_nr = pfn_to_section_nr(start_pfn);
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ms = __nr_to_section(section_nr);
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memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
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register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION);
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usage = ms->usage;
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page = virt_to_page(usage);
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mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
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for (i = 0; i < mapsize; i++, page++)
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get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
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}
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#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
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void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
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{
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unsigned long i, pfn, end_pfn, nr_pages;
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int node = pgdat->node_id;
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struct page *page;
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nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
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page = virt_to_page(pgdat);
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for (i = 0; i < nr_pages; i++, page++)
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get_page_bootmem(node, page, NODE_INFO);
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pfn = pgdat->node_start_pfn;
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end_pfn = pgdat_end_pfn(pgdat);
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/* register section info */
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for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
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/*
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* Some platforms can assign the same pfn to multiple nodes - on
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* node0 as well as nodeN. To avoid registering a pfn against
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* multiple nodes we check that this pfn does not already
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* reside in some other nodes.
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*/
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if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node))
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register_page_bootmem_info_section(pfn);
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}
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}
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