blob: 1ae2b2cc3a54148a72489416829cf36a26abd81b [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);
29static void __add_zone(struct zone *zone, unsigned long phys_start_pfn)
30{
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;
37 memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn);
38 zonetable_add(zone, nid, zone_type, phys_start_pfn, nr_pages);
39}
40
Dave Hansen0b0acbe2005-10-29 18:16:55 -070041extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
42 int nr_pages);
Dave Hansen3947be12005-10-29 18:16:54 -070043static int __add_section(struct zone *zone, unsigned long phys_start_pfn)
44{
Dave Hansen3947be12005-10-29 18:16:54 -070045 int nr_pages = PAGES_PER_SECTION;
Dave Hansen3947be12005-10-29 18:16:54 -070046 int ret;
47
Dave Hansen0b0acbe2005-10-29 18:16:55 -070048 ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
Dave Hansen3947be12005-10-29 18:16:54 -070049
50 if (ret < 0)
51 return ret;
52
53 __add_zone(zone, phys_start_pfn);
54 return register_new_memory(__pfn_to_section(phys_start_pfn));
55}
56
57/*
58 * Reasonably generic function for adding memory. It is
59 * expected that archs that support memory hotplug will
60 * call this function after deciding the zone to which to
61 * add the new pages.
62 */
63int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
64 unsigned long nr_pages)
65{
66 unsigned long i;
67 int err = 0;
68
69 for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) {
70 err = __add_section(zone, phys_start_pfn + i);
71
Joel H Schoppbed120c2006-05-01 12:16:11 -070072 /* We want to keep adding the rest of the
73 * sections if the first ones already exist
74 */
75 if (err && (err != -EEXIST))
Dave Hansen3947be12005-10-29 18:16:54 -070076 break;
77 }
78
79 return err;
80}
Joel H Schoppbed120c2006-05-01 12:16:11 -070081EXPORT_SYMBOL_GPL(__add_pages);
Dave Hansen3947be12005-10-29 18:16:54 -070082
83static void grow_zone_span(struct zone *zone,
84 unsigned long start_pfn, unsigned long end_pfn)
85{
86 unsigned long old_zone_end_pfn;
87
88 zone_span_writelock(zone);
89
90 old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
91 if (start_pfn < zone->zone_start_pfn)
92 zone->zone_start_pfn = start_pfn;
93
94 if (end_pfn > old_zone_end_pfn)
95 zone->spanned_pages = end_pfn - zone->zone_start_pfn;
96
97 zone_span_writeunlock(zone);
98}
99
100static void grow_pgdat_span(struct pglist_data *pgdat,
101 unsigned long start_pfn, unsigned long end_pfn)
102{
103 unsigned long old_pgdat_end_pfn =
104 pgdat->node_start_pfn + pgdat->node_spanned_pages;
105
106 if (start_pfn < pgdat->node_start_pfn)
107 pgdat->node_start_pfn = start_pfn;
108
109 if (end_pfn > old_pgdat_end_pfn)
Yasunori Goto118c71b2005-12-13 17:03:37 -0800110 pgdat->node_spanned_pages = end_pfn - pgdat->node_start_pfn;
Dave Hansen3947be12005-10-29 18:16:54 -0700111}
112
113int online_pages(unsigned long pfn, unsigned long nr_pages)
114{
115 unsigned long i;
116 unsigned long flags;
117 unsigned long onlined_pages = 0;
118 struct zone *zone;
119
120 /*
121 * This doesn't need a lock to do pfn_to_page().
122 * The section can't be removed here because of the
123 * memory_block->state_sem.
124 */
125 zone = page_zone(pfn_to_page(pfn));
126 pgdat_resize_lock(zone->zone_pgdat, &flags);
127 grow_zone_span(zone, pfn, pfn + nr_pages);
128 grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages);
129 pgdat_resize_unlock(zone->zone_pgdat, &flags);
130
131 for (i = 0; i < nr_pages; i++) {
132 struct page *page = pfn_to_page(pfn + i);
133 online_page(page);
134 onlined_pages++;
135 }
136 zone->present_pages += onlined_pages;
Yasunori Gotof2937be2006-03-09 17:33:51 -0800137 zone->zone_pgdat->node_present_pages += onlined_pages;
Dave Hansen3947be12005-10-29 18:16:54 -0700138
Dave Hansen61b13992005-10-29 18:16:56 -0700139 setup_per_zone_pages_min();
140
Dave Hansen3947be12005-10-29 18:16:54 -0700141 return 0;
142}