1 /*
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
27 extern void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn,
28 unsigned long size);
29 static 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
41 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
42 int nr_pages);
43 static int __add_section(struct zone *zone, unsigned long phys_start_pfn)
44 {
45 int nr_pages = PAGES_PER_SECTION;
46 int ret;
47
48 ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
49
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 */
63 int __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
72 /* We want to keep adding the rest of the
73 * sections if the first ones already exist
74 */
75 if (err && (err != -EEXIST))
76 break;
77 }
78
79 return err;
80 }
81 EXPORT_SYMBOL_GPL(__add_pages);
82
83 static 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 zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
95 zone->zone_start_pfn;
96
97 zone_span_writeunlock(zone);
98 }
99
100 static 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 pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
110 pgdat->node_start_pfn;
111 }
112
113 int 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;
137 zone->zone_pgdat->node_present_pages += onlined_pages;
138
139 setup_per_zone_pages_min();
140
141 return 0;
142 }
143
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