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3947be19 DH |
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 | ||
3947be19 DH |
27 | extern void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn, |
28 | unsigned long size); | |
718127cc | 29 | static int __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
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; | |
718127cc YG |
37 | 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 | } | |
3947be19 DH |
43 | memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn); |
44 | zonetable_add(zone, nid, zone_type, phys_start_pfn, nr_pages); | |
718127cc | 45 | return 0; |
3947be19 DH |
46 | } |
47 | ||
0b0acbec DH |
48 | extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
49 | int nr_pages); | |
3947be19 DH |
50 | static int __add_section(struct zone *zone, unsigned long phys_start_pfn) |
51 | { | |
3947be19 | 52 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
53 | int ret; |
54 | ||
0b0acbec | 55 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
56 | |
57 | if (ret < 0) | |
58 | return ret; | |
59 | ||
718127cc YG |
60 | ret = __add_zone(zone, phys_start_pfn); |
61 | ||
62 | if (ret < 0) | |
63 | return ret; | |
64 | ||
3947be19 DH |
65 | 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 | */ | |
74 | int __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 | ||
bed120c6 JS |
83 | /* We want to keep adding the rest of the |
84 | * sections if the first ones already exist | |
85 | */ | |
86 | if (err && (err != -EEXIST)) | |
3947be19 DH |
87 | break; |
88 | } | |
89 | ||
90 | return err; | |
91 | } | |
bed120c6 | 92 | EXPORT_SYMBOL_GPL(__add_pages); |
3947be19 DH |
93 | |
94 | static 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 | ||
25a6df95 YG |
105 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
106 | zone->zone_start_pfn; | |
3947be19 DH |
107 | |
108 | zone_span_writeunlock(zone); | |
109 | } | |
110 | ||
111 | static 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 | ||
25a6df95 YG |
120 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
121 | pgdat->node_start_pfn; | |
3947be19 DH |
122 | } |
123 | ||
124 | int 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; | |
130 | ||
131 | /* | |
132 | * This doesn't need a lock to do pfn_to_page(). | |
133 | * The section can't be removed here because of the | |
134 | * memory_block->state_sem. | |
135 | */ | |
136 | zone = page_zone(pfn_to_page(pfn)); | |
137 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
138 | grow_zone_span(zone, pfn, pfn + nr_pages); | |
139 | grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages); | |
140 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
141 | ||
142 | for (i = 0; i < nr_pages; i++) { | |
143 | struct page *page = pfn_to_page(pfn + i); | |
144 | online_page(page); | |
145 | onlined_pages++; | |
146 | } | |
147 | zone->present_pages += onlined_pages; | |
f2937be5 | 148 | zone->zone_pgdat->node_present_pages += onlined_pages; |
3947be19 | 149 | |
61b13993 DH |
150 | setup_per_zone_pages_min(); |
151 | ||
3947be19 DH |
152 | return 0; |
153 | } |