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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); | |
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 | ||
0b0acbec DH |
41 | extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
42 | int nr_pages); | |
3947be19 DH |
43 | static int __add_section(struct zone *zone, unsigned long phys_start_pfn) |
44 | { | |
45 | struct pglist_data *pgdat = zone->zone_pgdat; | |
46 | int nr_pages = PAGES_PER_SECTION; | |
3947be19 DH |
47 | int ret; |
48 | ||
0b0acbec | 49 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
50 | |
51 | if (ret < 0) | |
52 | return ret; | |
53 | ||
54 | __add_zone(zone, phys_start_pfn); | |
55 | return register_new_memory(__pfn_to_section(phys_start_pfn)); | |
56 | } | |
57 | ||
58 | /* | |
59 | * Reasonably generic function for adding memory. It is | |
60 | * expected that archs that support memory hotplug will | |
61 | * call this function after deciding the zone to which to | |
62 | * add the new pages. | |
63 | */ | |
64 | int __add_pages(struct zone *zone, unsigned long phys_start_pfn, | |
65 | unsigned long nr_pages) | |
66 | { | |
67 | unsigned long i; | |
68 | int err = 0; | |
69 | ||
70 | for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) { | |
71 | err = __add_section(zone, phys_start_pfn + i); | |
72 | ||
73 | if (err) | |
74 | break; | |
75 | } | |
76 | ||
77 | return err; | |
78 | } | |
79 | ||
80 | static void grow_zone_span(struct zone *zone, | |
81 | unsigned long start_pfn, unsigned long end_pfn) | |
82 | { | |
83 | unsigned long old_zone_end_pfn; | |
84 | ||
85 | zone_span_writelock(zone); | |
86 | ||
87 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
88 | if (start_pfn < zone->zone_start_pfn) | |
89 | zone->zone_start_pfn = start_pfn; | |
90 | ||
91 | if (end_pfn > old_zone_end_pfn) | |
92 | zone->spanned_pages = end_pfn - zone->zone_start_pfn; | |
93 | ||
94 | zone_span_writeunlock(zone); | |
95 | } | |
96 | ||
97 | static void grow_pgdat_span(struct pglist_data *pgdat, | |
98 | unsigned long start_pfn, unsigned long end_pfn) | |
99 | { | |
100 | unsigned long old_pgdat_end_pfn = | |
101 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
102 | ||
103 | if (start_pfn < pgdat->node_start_pfn) | |
104 | pgdat->node_start_pfn = start_pfn; | |
105 | ||
106 | if (end_pfn > old_pgdat_end_pfn) | |
107 | pgdat->node_spanned_pages = end_pfn - pgdat->node_spanned_pages; | |
108 | } | |
109 | ||
110 | int online_pages(unsigned long pfn, unsigned long nr_pages) | |
111 | { | |
112 | unsigned long i; | |
113 | unsigned long flags; | |
114 | unsigned long onlined_pages = 0; | |
115 | struct zone *zone; | |
116 | ||
117 | /* | |
118 | * This doesn't need a lock to do pfn_to_page(). | |
119 | * The section can't be removed here because of the | |
120 | * memory_block->state_sem. | |
121 | */ | |
122 | zone = page_zone(pfn_to_page(pfn)); | |
123 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
124 | grow_zone_span(zone, pfn, pfn + nr_pages); | |
125 | grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages); | |
126 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
127 | ||
128 | for (i = 0; i < nr_pages; i++) { | |
129 | struct page *page = pfn_to_page(pfn + i); | |
130 | online_page(page); | |
131 | onlined_pages++; | |
132 | } | |
133 | zone->present_pages += onlined_pages; | |
134 | ||
61b13993 DH |
135 | setup_per_zone_pages_min(); |
136 | ||
3947be19 DH |
137 | return 0; |
138 | } |