blob: 841a077d5aeb0d3423ecba8ed5d81efdd72c2442 [file] [log] [blame]
Dave Hansen3947be12005-10-29 18:16:54 -07001/*
2 * linux/mm/memory_hotplug.c
3 *
4 * Copyright (C)
5 */
6
7#include <linux/config.h>
8#include <linux/stddef.h>
9#include <linux/mm.h>
10#include <linux/swap.h>
11#include <linux/interrupt.h>
12#include <linux/pagemap.h>
13#include <linux/bootmem.h>
14#include <linux/compiler.h>
15#include <linux/module.h>
16#include <linux/pagevec.h>
17#include <linux/slab.h>
18#include <linux/sysctl.h>
19#include <linux/cpu.h>
20#include <linux/memory.h>
21#include <linux/memory_hotplug.h>
22#include <linux/highmem.h>
23#include <linux/vmalloc.h>
24
25#include <asm/tlbflush.h>
26
Dave Hansen3947be12005-10-29 18:16:54 -070027extern void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn,
28 unsigned long size);
Yasunori Goto718127c2006-06-23 02:03:10 -070029static int __add_zone(struct zone *zone, unsigned long phys_start_pfn)
Dave Hansen3947be12005-10-29 18:16:54 -070030{
31 struct pglist_data *pgdat = zone->zone_pgdat;
32 int nr_pages = PAGES_PER_SECTION;
33 int nid = pgdat->node_id;
34 int zone_type;
35
36 zone_type = zone - pgdat->node_zones;
Yasunori Goto718127c2006-06-23 02:03:10 -070037 if (!populated_zone(zone)) {
38 int ret = 0;
39 ret = init_currently_empty_zone(zone, phys_start_pfn, nr_pages);
40 if (ret < 0)
41 return ret;
42 }
Dave Hansen3947be12005-10-29 18:16:54 -070043 memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn);
44 zonetable_add(zone, nid, zone_type, phys_start_pfn, nr_pages);
Yasunori Goto718127c2006-06-23 02:03:10 -070045 return 0;
Dave Hansen3947be12005-10-29 18:16:54 -070046}
47
Dave Hansen0b0acbe2005-10-29 18:16:55 -070048extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
49 int nr_pages);
Dave Hansen3947be12005-10-29 18:16:54 -070050static int __add_section(struct zone *zone, unsigned long phys_start_pfn)
51{
Dave Hansen3947be12005-10-29 18:16:54 -070052 int nr_pages = PAGES_PER_SECTION;
Dave Hansen3947be12005-10-29 18:16:54 -070053 int ret;
54
Dave Hansen0b0acbe2005-10-29 18:16:55 -070055 ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
Dave Hansen3947be12005-10-29 18:16:54 -070056
57 if (ret < 0)
58 return ret;
59
Yasunori Goto718127c2006-06-23 02:03:10 -070060 ret = __add_zone(zone, phys_start_pfn);
61
62 if (ret < 0)
63 return ret;
64
Dave Hansen3947be12005-10-29 18:16:54 -070065 return register_new_memory(__pfn_to_section(phys_start_pfn));
66}
67
68/*
69 * Reasonably generic function for adding memory. It is
70 * expected that archs that support memory hotplug will
71 * call this function after deciding the zone to which to
72 * add the new pages.
73 */
74int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
75 unsigned long nr_pages)
76{
77 unsigned long i;
78 int err = 0;
79
80 for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) {
81 err = __add_section(zone, phys_start_pfn + i);
82
Joel H Schoppbed120c2006-05-01 12:16:11 -070083 /* We want to keep adding the rest of the
84 * sections if the first ones already exist
85 */
86 if (err && (err != -EEXIST))
Dave Hansen3947be12005-10-29 18:16:54 -070087 break;
88 }
89
90 return err;
91}
Joel H Schoppbed120c2006-05-01 12:16:11 -070092EXPORT_SYMBOL_GPL(__add_pages);
Dave Hansen3947be12005-10-29 18:16:54 -070093
94static void grow_zone_span(struct zone *zone,
95 unsigned long start_pfn, unsigned long end_pfn)
96{
97 unsigned long old_zone_end_pfn;
98
99 zone_span_writelock(zone);
100
101 old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
102 if (start_pfn < zone->zone_start_pfn)
103 zone->zone_start_pfn = start_pfn;
104
Yasunori Goto25a6df92006-05-30 21:25:42 -0700105 zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
106 zone->zone_start_pfn;
Dave Hansen3947be12005-10-29 18:16:54 -0700107
108 zone_span_writeunlock(zone);
109}
110
111static void grow_pgdat_span(struct pglist_data *pgdat,
112 unsigned long start_pfn, unsigned long end_pfn)
113{
114 unsigned long old_pgdat_end_pfn =
115 pgdat->node_start_pfn + pgdat->node_spanned_pages;
116
117 if (start_pfn < pgdat->node_start_pfn)
118 pgdat->node_start_pfn = start_pfn;
119
Yasunori Goto25a6df92006-05-30 21:25:42 -0700120 pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
121 pgdat->node_start_pfn;
Dave Hansen3947be12005-10-29 18:16:54 -0700122}
123
124int online_pages(unsigned long pfn, unsigned long nr_pages)
125{
126 unsigned long i;
127 unsigned long flags;
128 unsigned long onlined_pages = 0;
129 struct zone *zone;
Yasunori Goto68113782006-06-23 02:03:11 -0700130 int need_zonelists_rebuild = 0;
Dave Hansen3947be12005-10-29 18:16:54 -0700131
132 /*
133 * This doesn't need a lock to do pfn_to_page().
134 * The section can't be removed here because of the
135 * memory_block->state_sem.
136 */
137 zone = page_zone(pfn_to_page(pfn));
138 pgdat_resize_lock(zone->zone_pgdat, &flags);
139 grow_zone_span(zone, pfn, pfn + nr_pages);
140 grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages);
141 pgdat_resize_unlock(zone->zone_pgdat, &flags);
142
Yasunori Goto68113782006-06-23 02:03:11 -0700143 /*
144 * If this zone is not populated, then it is not in zonelist.
145 * This means the page allocator ignores this zone.
146 * So, zonelist must be updated after online.
147 */
148 if (!populated_zone(zone))
149 need_zonelists_rebuild = 1;
150
Dave Hansen3947be12005-10-29 18:16:54 -0700151 for (i = 0; i < nr_pages; i++) {
152 struct page *page = pfn_to_page(pfn + i);
153 online_page(page);
154 onlined_pages++;
155 }
156 zone->present_pages += onlined_pages;
Yasunori Gotof2937be2006-03-09 17:33:51 -0800157 zone->zone_pgdat->node_present_pages += onlined_pages;
Dave Hansen3947be12005-10-29 18:16:54 -0700158
Dave Hansen61b13992005-10-29 18:16:56 -0700159 setup_per_zone_pages_min();
160
Yasunori Goto68113782006-06-23 02:03:11 -0700161 if (need_zonelists_rebuild)
162 build_all_zonelists();
KAMEZAWA Hiroyuki5a4d4362006-06-23 02:03:47 -0700163 vm_total_pages = nr_free_pagecache_pages();
Dave Hansen3947be12005-10-29 18:16:54 -0700164 return 0;
165}