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 #include <linux/kmemleak.h> 16 17 void get_page_bootmem(unsigned long info, struct page *page, 18 enum bootmem_type type) 19 { 20 BUG_ON(type > 0xf); 21 BUG_ON(info > (ULONG_MAX >> 4)); 22 SetPagePrivate(page); 23 set_page_private(page, info << 4 | type); 24 page_ref_inc(page); 25 } 26 27 void put_page_bootmem(struct page *page) 28 { 29 enum bootmem_type type = bootmem_type(page); 30 31 BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || 32 type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); 33 34 if (page_ref_dec_return(page) == 1) { 35 ClearPagePrivate(page); 36 set_page_private(page, 0); 37 INIT_LIST_HEAD(&page->lru); 38 kmemleak_free_part_phys(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE); 39 free_reserved_page(page); 40 } 41 } 42 43 static void __init register_page_bootmem_info_section(unsigned long start_pfn) 44 { 45 unsigned long mapsize, section_nr, i; 46 struct mem_section *ms; 47 struct mem_section_usage *usage; 48 struct page *page; 49 50 start_pfn = SECTION_ALIGN_DOWN(start_pfn); 51 section_nr = pfn_to_section_nr(start_pfn); 52 ms = __nr_to_section(section_nr); 53 54 if (!preinited_vmemmap_section(ms)) 55 register_page_bootmem_memmap(section_nr, pfn_to_page(start_pfn), 56 PAGES_PER_SECTION); 57 58 usage = ms->usage; 59 page = virt_to_page(usage); 60 61 mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; 62 63 for (i = 0; i < mapsize; i++, page++) 64 get_page_bootmem(section_nr, page, MIX_SECTION_INFO); 65 } 66 67 void __init register_page_bootmem_info_node(struct pglist_data *pgdat) 68 { 69 unsigned long i, pfn, end_pfn, nr_pages; 70 int node = pgdat->node_id; 71 struct page *page; 72 73 nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; 74 page = virt_to_page(pgdat); 75 76 for (i = 0; i < nr_pages; i++, page++) 77 get_page_bootmem(node, page, NODE_INFO); 78 79 pfn = pgdat->node_start_pfn; 80 end_pfn = pgdat_end_pfn(pgdat); 81 82 /* register section info */ 83 for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 84 /* 85 * Some platforms can assign the same pfn to multiple nodes - on 86 * node0 as well as nodeN. To avoid registering a pfn against 87 * multiple nodes we check that this pfn does not already 88 * reside in some other nodes. 89 */ 90 if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) 91 register_page_bootmem_info_section(pfn); 92 } 93 } 94