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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> | |
0a547039 | 24 | #include <linux/ioport.h> |
3947be19 DH |
25 | |
26 | #include <asm/tlbflush.h> | |
27 | ||
3947be19 DH |
28 | extern void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn, |
29 | unsigned long size); | |
718127cc | 30 | static int __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
31 | { |
32 | struct pglist_data *pgdat = zone->zone_pgdat; | |
33 | int nr_pages = PAGES_PER_SECTION; | |
34 | int nid = pgdat->node_id; | |
35 | int zone_type; | |
36 | ||
37 | zone_type = zone - pgdat->node_zones; | |
718127cc YG |
38 | if (!populated_zone(zone)) { |
39 | int ret = 0; | |
40 | ret = init_currently_empty_zone(zone, phys_start_pfn, nr_pages); | |
41 | if (ret < 0) | |
42 | return ret; | |
43 | } | |
3947be19 DH |
44 | memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn); |
45 | zonetable_add(zone, nid, zone_type, phys_start_pfn, nr_pages); | |
718127cc | 46 | return 0; |
3947be19 DH |
47 | } |
48 | ||
0b0acbec DH |
49 | extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
50 | int nr_pages); | |
3947be19 DH |
51 | static int __add_section(struct zone *zone, unsigned long phys_start_pfn) |
52 | { | |
3947be19 | 53 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
54 | int ret; |
55 | ||
0b0acbec | 56 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
57 | |
58 | if (ret < 0) | |
59 | return ret; | |
60 | ||
718127cc YG |
61 | ret = __add_zone(zone, phys_start_pfn); |
62 | ||
63 | if (ret < 0) | |
64 | return ret; | |
65 | ||
3947be19 DH |
66 | return register_new_memory(__pfn_to_section(phys_start_pfn)); |
67 | } | |
68 | ||
69 | /* | |
70 | * Reasonably generic function for adding memory. It is | |
71 | * expected that archs that support memory hotplug will | |
72 | * call this function after deciding the zone to which to | |
73 | * add the new pages. | |
74 | */ | |
75 | int __add_pages(struct zone *zone, unsigned long phys_start_pfn, | |
76 | unsigned long nr_pages) | |
77 | { | |
78 | unsigned long i; | |
79 | int err = 0; | |
80 | ||
81 | for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) { | |
82 | err = __add_section(zone, phys_start_pfn + i); | |
83 | ||
bed120c6 JS |
84 | /* We want to keep adding the rest of the |
85 | * sections if the first ones already exist | |
86 | */ | |
87 | if (err && (err != -EEXIST)) | |
3947be19 DH |
88 | break; |
89 | } | |
90 | ||
91 | return err; | |
92 | } | |
bed120c6 | 93 | EXPORT_SYMBOL_GPL(__add_pages); |
3947be19 DH |
94 | |
95 | static void grow_zone_span(struct zone *zone, | |
96 | unsigned long start_pfn, unsigned long end_pfn) | |
97 | { | |
98 | unsigned long old_zone_end_pfn; | |
99 | ||
100 | zone_span_writelock(zone); | |
101 | ||
102 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
103 | if (start_pfn < zone->zone_start_pfn) | |
104 | zone->zone_start_pfn = start_pfn; | |
105 | ||
25a6df95 YG |
106 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
107 | zone->zone_start_pfn; | |
3947be19 DH |
108 | |
109 | zone_span_writeunlock(zone); | |
110 | } | |
111 | ||
112 | static void grow_pgdat_span(struct pglist_data *pgdat, | |
113 | unsigned long start_pfn, unsigned long end_pfn) | |
114 | { | |
115 | unsigned long old_pgdat_end_pfn = | |
116 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
117 | ||
118 | if (start_pfn < pgdat->node_start_pfn) | |
119 | pgdat->node_start_pfn = start_pfn; | |
120 | ||
25a6df95 YG |
121 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
122 | pgdat->node_start_pfn; | |
3947be19 DH |
123 | } |
124 | ||
125 | int online_pages(unsigned long pfn, unsigned long nr_pages) | |
126 | { | |
127 | unsigned long i; | |
128 | unsigned long flags; | |
129 | unsigned long onlined_pages = 0; | |
2842f114 KH |
130 | struct resource res; |
131 | u64 section_end; | |
132 | unsigned long start_pfn; | |
3947be19 | 133 | struct zone *zone; |
6811378e | 134 | int need_zonelists_rebuild = 0; |
3947be19 DH |
135 | |
136 | /* | |
137 | * This doesn't need a lock to do pfn_to_page(). | |
138 | * The section can't be removed here because of the | |
139 | * memory_block->state_sem. | |
140 | */ | |
141 | zone = page_zone(pfn_to_page(pfn)); | |
142 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
143 | grow_zone_span(zone, pfn, pfn + nr_pages); | |
144 | grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages); | |
145 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
146 | ||
6811378e YG |
147 | /* |
148 | * If this zone is not populated, then it is not in zonelist. | |
149 | * This means the page allocator ignores this zone. | |
150 | * So, zonelist must be updated after online. | |
151 | */ | |
152 | if (!populated_zone(zone)) | |
153 | need_zonelists_rebuild = 1; | |
154 | ||
2842f114 KH |
155 | res.start = (u64)pfn << PAGE_SHIFT; |
156 | res.end = res.start + ((u64)nr_pages << PAGE_SHIFT) - 1; | |
157 | res.flags = IORESOURCE_MEM; /* we just need system ram */ | |
158 | section_end = res.end; | |
159 | ||
160 | while (find_next_system_ram(&res) >= 0) { | |
161 | start_pfn = (unsigned long)(res.start >> PAGE_SHIFT); | |
162 | nr_pages = (unsigned long) | |
163 | ((res.end + 1 - res.start) >> PAGE_SHIFT); | |
164 | ||
165 | if (PageReserved(pfn_to_page(start_pfn))) { | |
166 | /* this region's page is not onlined now */ | |
167 | for (i = 0; i < nr_pages; i++) { | |
168 | struct page *page = pfn_to_page(start_pfn + i); | |
169 | online_page(page); | |
170 | onlined_pages++; | |
171 | } | |
172 | } | |
173 | ||
174 | res.start = res.end + 1; | |
175 | res.end = section_end; | |
3947be19 DH |
176 | } |
177 | zone->present_pages += onlined_pages; | |
f2937be5 | 178 | zone->zone_pgdat->node_present_pages += onlined_pages; |
3947be19 | 179 | |
61b13993 DH |
180 | setup_per_zone_pages_min(); |
181 | ||
6811378e YG |
182 | if (need_zonelists_rebuild) |
183 | build_all_zonelists(); | |
5a4d4361 | 184 | vm_total_pages = nr_free_pagecache_pages(); |
3947be19 DH |
185 | return 0; |
186 | } | |
bc02af93 | 187 | |
9af3c2de YG |
188 | static pg_data_t *hotadd_new_pgdat(int nid, u64 start) |
189 | { | |
190 | struct pglist_data *pgdat; | |
191 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
192 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
193 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
194 | ||
195 | pgdat = arch_alloc_nodedata(nid); | |
196 | if (!pgdat) | |
197 | return NULL; | |
198 | ||
199 | arch_refresh_nodedata(nid, pgdat); | |
200 | ||
201 | /* we can use NODE_DATA(nid) from here */ | |
202 | ||
203 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
204 | free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size); | |
205 | ||
206 | return pgdat; | |
207 | } | |
208 | ||
209 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
210 | { | |
211 | arch_refresh_nodedata(nid, NULL); | |
212 | arch_free_nodedata(pgdat); | |
213 | return; | |
214 | } | |
215 | ||
0a547039 KH |
216 | /* add this memory to iomem resource */ |
217 | static void register_memory_resource(u64 start, u64 size) | |
218 | { | |
219 | struct resource *res; | |
220 | ||
221 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
222 | BUG_ON(!res); | |
223 | ||
224 | res->name = "System RAM"; | |
225 | res->start = start; | |
226 | res->end = start + size - 1; | |
227 | res->flags = IORESOURCE_MEM; | |
228 | if (request_resource(&iomem_resource, res) < 0) { | |
229 | printk("System RAM resource %llx - %llx cannot be added\n", | |
230 | (unsigned long long)res->start, (unsigned long long)res->end); | |
231 | kfree(res); | |
232 | } | |
233 | } | |
234 | ||
235 | ||
236 | ||
bc02af93 YG |
237 | int add_memory(int nid, u64 start, u64 size) |
238 | { | |
9af3c2de YG |
239 | pg_data_t *pgdat = NULL; |
240 | int new_pgdat = 0; | |
bc02af93 YG |
241 | int ret; |
242 | ||
9af3c2de YG |
243 | if (!node_online(nid)) { |
244 | pgdat = hotadd_new_pgdat(nid, start); | |
245 | if (!pgdat) | |
246 | return -ENOMEM; | |
247 | new_pgdat = 1; | |
248 | ret = kswapd_run(nid); | |
249 | if (ret) | |
250 | goto error; | |
251 | } | |
252 | ||
bc02af93 YG |
253 | /* call arch's memory hotadd */ |
254 | ret = arch_add_memory(nid, start, size); | |
255 | ||
9af3c2de YG |
256 | if (ret < 0) |
257 | goto error; | |
258 | ||
259 | /* we online node here. we have no error path from here. */ | |
260 | node_set_online(nid); | |
261 | ||
0a547039 KH |
262 | /* register this memory as resource */ |
263 | register_memory_resource(start, size); | |
264 | ||
9af3c2de YG |
265 | return ret; |
266 | error: | |
267 | /* rollback pgdat allocation and others */ | |
268 | if (new_pgdat) | |
269 | rollback_node_hotadd(nid, pgdat); | |
270 | ||
bc02af93 YG |
271 | return ret; |
272 | } | |
273 | EXPORT_SYMBOL_GPL(add_memory); |