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 { 18 page->freelist = (void *)type; 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 { 26 unsigned long type; 27 28 type = (unsigned long) page->freelist; 29 BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || 30 type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); 31 32 if (page_ref_dec_return(page) == 1) { 33 page->freelist = NULL; 34 ClearPagePrivate(page); 35 set_page_private(page, 0); 36 INIT_LIST_HEAD(&page->lru); 37 free_reserved_page(page); 38 } 39 } 40 41 #ifndef CONFIG_SPARSEMEM_VMEMMAP 42 static void register_page_bootmem_info_section(unsigned long start_pfn) 43 { 44 unsigned long mapsize, section_nr, i; 45 struct mem_section *ms; 46 struct page *page, *memmap; 47 struct mem_section_usage *usage; 48 49 section_nr = pfn_to_section_nr(start_pfn); 50 ms = __nr_to_section(section_nr); 51 52 /* Get section's memmap address */ 53 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); 54 55 /* 56 * Get page for the memmap's phys address 57 * XXX: need more consideration for sparse_vmemmap... 58 */ 59 page = virt_to_page(memmap); 60 mapsize = sizeof(struct page) * PAGES_PER_SECTION; 61 mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; 62 63 /* remember memmap's page */ 64 for (i = 0; i < mapsize; i++, page++) 65 get_page_bootmem(section_nr, page, SECTION_INFO); 66 67 usage = ms->usage; 68 page = virt_to_page(usage); 69 70 mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; 71 72 for (i = 0; i < mapsize; i++, page++) 73 get_page_bootmem(section_nr, page, MIX_SECTION_INFO); 74 75 } 76 #else /* CONFIG_SPARSEMEM_VMEMMAP */ 77 static void register_page_bootmem_info_section(unsigned long start_pfn) 78 { 79 unsigned long mapsize, section_nr, i; 80 struct mem_section *ms; 81 struct page *page, *memmap; 82 struct mem_section_usage *usage; 83 84 section_nr = pfn_to_section_nr(start_pfn); 85 ms = __nr_to_section(section_nr); 86 87 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); 88 89 register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); 90 91 usage = ms->usage; 92 page = virt_to_page(usage); 93 94 mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; 95 96 for (i = 0; i < mapsize; i++, page++) 97 get_page_bootmem(section_nr, page, MIX_SECTION_INFO); 98 } 99 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 100 101 void __init register_page_bootmem_info_node(struct pglist_data *pgdat) 102 { 103 unsigned long i, pfn, end_pfn, nr_pages; 104 int node = pgdat->node_id; 105 struct page *page; 106 107 nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; 108 page = virt_to_page(pgdat); 109 110 for (i = 0; i < nr_pages; i++, page++) 111 get_page_bootmem(node, page, NODE_INFO); 112 113 pfn = pgdat->node_start_pfn; 114 end_pfn = pgdat_end_pfn(pgdat); 115 116 /* register section info */ 117 for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 118 /* 119 * Some platforms can assign the same pfn to multiple nodes - on 120 * node0 as well as nodeN. To avoid registering a pfn against 121 * multiple nodes we check that this pfn does not already 122 * reside in some other nodes. 123 */ 124 if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) 125 register_page_bootmem_info_section(pfn); 126 } 127 } 128