1 // SPDX-License-Identifier: GPL-2.0
3 * Bootmem core functions.
5 * Copyright (c) 2020, Bytedance.
7 * Author: Muchun Song <songmuchun@bytedance.com>
11 #include <linux/compiler.h>
12 #include <linux/memblock.h>
13 #include <linux/bootmem_info.h>
14 #include <linux/memory_hotplug.h>
15 #include <linux/kmemleak.h>
17 void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
19 page->freelist = (void *)type;
21 set_page_private(page, info);
25 void put_page_bootmem(struct page *page)
29 type = (unsigned long) page->freelist;
30 BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
31 type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
33 if (page_ref_dec_return(page) == 1) {
34 page->freelist = NULL;
35 ClearPagePrivate(page);
36 set_page_private(page, 0);
37 INIT_LIST_HEAD(&page->lru);
38 kmemleak_free_part(page_to_virt(page), PAGE_SIZE);
39 free_reserved_page(page);
43 #ifndef CONFIG_SPARSEMEM_VMEMMAP
44 static void __init register_page_bootmem_info_section(unsigned long start_pfn)
46 unsigned long mapsize, section_nr, i;
47 struct mem_section *ms;
48 struct page *page, *memmap;
49 struct mem_section_usage *usage;
51 section_nr = pfn_to_section_nr(start_pfn);
52 ms = __nr_to_section(section_nr);
54 /* Get section's memmap address */
55 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
58 * Get page for the memmap's phys address
59 * XXX: need more consideration for sparse_vmemmap...
61 page = virt_to_page(memmap);
62 mapsize = sizeof(struct page) * PAGES_PER_SECTION;
63 mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;
65 /* remember memmap's page */
66 for (i = 0; i < mapsize; i++, page++)
67 get_page_bootmem(section_nr, page, SECTION_INFO);
70 page = virt_to_page(usage);
72 mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
74 for (i = 0; i < mapsize; i++, page++)
75 get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
78 #else /* CONFIG_SPARSEMEM_VMEMMAP */
79 static void __init register_page_bootmem_info_section(unsigned long start_pfn)
81 unsigned long mapsize, section_nr, i;
82 struct mem_section *ms;
83 struct page *page, *memmap;
84 struct mem_section_usage *usage;
86 section_nr = pfn_to_section_nr(start_pfn);
87 ms = __nr_to_section(section_nr);
89 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
91 register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION);
94 page = virt_to_page(usage);
96 mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
98 for (i = 0; i < mapsize; i++, page++)
99 get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
101 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
103 void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
105 unsigned long i, pfn, end_pfn, nr_pages;
106 int node = pgdat->node_id;
109 nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
110 page = virt_to_page(pgdat);
112 for (i = 0; i < nr_pages; i++, page++)
113 get_page_bootmem(node, page, NODE_INFO);
115 pfn = pgdat->node_start_pfn;
116 end_pfn = pgdat_end_pfn(pgdat);
118 /* register section info */
119 for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
121 * Some platforms can assign the same pfn to multiple nodes - on
122 * node0 as well as nodeN. To avoid registering a pfn against
123 * multiple nodes we check that this pfn does not already
124 * reside in some other nodes.
126 if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node))
127 register_page_bootmem_info_section(pfn);