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->index = 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 = page->index; 27 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) { 32 page->index = 0; 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 41 static void __init register_page_bootmem_info_section(unsigned long start_pfn) 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 */ 76 static void __init register_page_bootmem_info_section(unsigned long start_pfn) 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 } 127