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Commit | Line | Data |
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3947be19 DH |
1 | /* |
2 | * linux/mm/memory_hotplug.c | |
3 | * | |
4 | * Copyright (C) | |
5 | */ | |
6 | ||
3947be19 DH |
7 | #include <linux/stddef.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/swap.h> | |
10 | #include <linux/interrupt.h> | |
11 | #include <linux/pagemap.h> | |
12 | #include <linux/bootmem.h> | |
13 | #include <linux/compiler.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/pagevec.h> | |
2d1d43f6 | 16 | #include <linux/writeback.h> |
3947be19 DH |
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> |
38837fc7 | 25 | #include <linux/cpuset.h> |
3947be19 DH |
26 | |
27 | #include <asm/tlbflush.h> | |
28 | ||
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 | ||
3947be19 DH |
48 | static int __add_section(struct zone *zone, unsigned long phys_start_pfn) |
49 | { | |
3947be19 | 50 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
51 | int ret; |
52 | ||
ebd15302 KH |
53 | if (pfn_valid(phys_start_pfn)) |
54 | return -EEXIST; | |
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; | |
6f712711 KH |
80 | int start_sec, end_sec; |
81 | /* during initialize mem_map, align hot-added range to section */ | |
82 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
83 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
3947be19 | 84 | |
6f712711 KH |
85 | for (i = start_sec; i <= end_sec; i++) { |
86 | err = __add_section(zone, i << PFN_SECTION_SHIFT); | |
3947be19 | 87 | |
6f712711 KH |
88 | /* |
89 | * EEXIST is finally dealed with by ioresource collision | |
90 | * check. see add_memory() => register_memory_resource() | |
91 | * Warning will be printed if there is collision. | |
bed120c6 JS |
92 | */ |
93 | if (err && (err != -EEXIST)) | |
3947be19 | 94 | break; |
6f712711 | 95 | err = 0; |
3947be19 DH |
96 | } |
97 | ||
98 | return err; | |
99 | } | |
bed120c6 | 100 | EXPORT_SYMBOL_GPL(__add_pages); |
3947be19 DH |
101 | |
102 | static void grow_zone_span(struct zone *zone, | |
103 | unsigned long start_pfn, unsigned long end_pfn) | |
104 | { | |
105 | unsigned long old_zone_end_pfn; | |
106 | ||
107 | zone_span_writelock(zone); | |
108 | ||
109 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
110 | if (start_pfn < zone->zone_start_pfn) | |
111 | zone->zone_start_pfn = start_pfn; | |
112 | ||
25a6df95 YG |
113 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
114 | zone->zone_start_pfn; | |
3947be19 DH |
115 | |
116 | zone_span_writeunlock(zone); | |
117 | } | |
118 | ||
119 | static void grow_pgdat_span(struct pglist_data *pgdat, | |
120 | unsigned long start_pfn, unsigned long end_pfn) | |
121 | { | |
122 | unsigned long old_pgdat_end_pfn = | |
123 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
124 | ||
125 | if (start_pfn < pgdat->node_start_pfn) | |
126 | pgdat->node_start_pfn = start_pfn; | |
127 | ||
25a6df95 YG |
128 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
129 | pgdat->node_start_pfn; | |
3947be19 DH |
130 | } |
131 | ||
132 | int online_pages(unsigned long pfn, unsigned long nr_pages) | |
133 | { | |
134 | unsigned long i; | |
135 | unsigned long flags; | |
136 | unsigned long onlined_pages = 0; | |
2842f114 KH |
137 | struct resource res; |
138 | u64 section_end; | |
139 | unsigned long start_pfn; | |
3947be19 | 140 | struct zone *zone; |
6811378e | 141 | int need_zonelists_rebuild = 0; |
3947be19 DH |
142 | |
143 | /* | |
144 | * This doesn't need a lock to do pfn_to_page(). | |
145 | * The section can't be removed here because of the | |
146 | * memory_block->state_sem. | |
147 | */ | |
148 | zone = page_zone(pfn_to_page(pfn)); | |
149 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
150 | grow_zone_span(zone, pfn, pfn + nr_pages); | |
151 | grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages); | |
152 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
153 | ||
6811378e YG |
154 | /* |
155 | * If this zone is not populated, then it is not in zonelist. | |
156 | * This means the page allocator ignores this zone. | |
157 | * So, zonelist must be updated after online. | |
158 | */ | |
159 | if (!populated_zone(zone)) | |
160 | need_zonelists_rebuild = 1; | |
161 | ||
2842f114 KH |
162 | res.start = (u64)pfn << PAGE_SHIFT; |
163 | res.end = res.start + ((u64)nr_pages << PAGE_SHIFT) - 1; | |
164 | res.flags = IORESOURCE_MEM; /* we just need system ram */ | |
165 | section_end = res.end; | |
166 | ||
58c1b5b0 | 167 | while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) { |
2842f114 KH |
168 | start_pfn = (unsigned long)(res.start >> PAGE_SHIFT); |
169 | nr_pages = (unsigned long) | |
170 | ((res.end + 1 - res.start) >> PAGE_SHIFT); | |
171 | ||
172 | if (PageReserved(pfn_to_page(start_pfn))) { | |
173 | /* this region's page is not onlined now */ | |
174 | for (i = 0; i < nr_pages; i++) { | |
175 | struct page *page = pfn_to_page(start_pfn + i); | |
176 | online_page(page); | |
177 | onlined_pages++; | |
178 | } | |
179 | } | |
180 | ||
181 | res.start = res.end + 1; | |
182 | res.end = section_end; | |
3947be19 DH |
183 | } |
184 | zone->present_pages += onlined_pages; | |
f2937be5 | 185 | zone->zone_pgdat->node_present_pages += onlined_pages; |
3947be19 | 186 | |
61b13993 DH |
187 | setup_per_zone_pages_min(); |
188 | ||
6811378e YG |
189 | if (need_zonelists_rebuild) |
190 | build_all_zonelists(); | |
5a4d4361 | 191 | vm_total_pages = nr_free_pagecache_pages(); |
2d1d43f6 | 192 | writeback_set_ratelimit(); |
3947be19 DH |
193 | return 0; |
194 | } | |
bc02af93 | 195 | |
9af3c2de YG |
196 | static pg_data_t *hotadd_new_pgdat(int nid, u64 start) |
197 | { | |
198 | struct pglist_data *pgdat; | |
199 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
200 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
201 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
202 | ||
203 | pgdat = arch_alloc_nodedata(nid); | |
204 | if (!pgdat) | |
205 | return NULL; | |
206 | ||
207 | arch_refresh_nodedata(nid, pgdat); | |
208 | ||
209 | /* we can use NODE_DATA(nid) from here */ | |
210 | ||
211 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
212 | free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size); | |
213 | ||
214 | return pgdat; | |
215 | } | |
216 | ||
217 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
218 | { | |
219 | arch_refresh_nodedata(nid, NULL); | |
220 | arch_free_nodedata(pgdat); | |
221 | return; | |
222 | } | |
223 | ||
0a547039 | 224 | /* add this memory to iomem resource */ |
ebd15302 | 225 | static struct resource *register_memory_resource(u64 start, u64 size) |
0a547039 KH |
226 | { |
227 | struct resource *res; | |
0a547039 KH |
228 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
229 | BUG_ON(!res); | |
230 | ||
231 | res->name = "System RAM"; | |
232 | res->start = start; | |
233 | res->end = start + size - 1; | |
234 | res->flags = IORESOURCE_MEM; | |
235 | if (request_resource(&iomem_resource, res) < 0) { | |
236 | printk("System RAM resource %llx - %llx cannot be added\n", | |
237 | (unsigned long long)res->start, (unsigned long long)res->end); | |
238 | kfree(res); | |
ebd15302 | 239 | res = NULL; |
0a547039 | 240 | } |
ebd15302 KH |
241 | return res; |
242 | } | |
243 | ||
244 | static void release_memory_resource(struct resource *res) | |
245 | { | |
246 | if (!res) | |
247 | return; | |
248 | release_resource(res); | |
249 | kfree(res); | |
250 | return; | |
0a547039 KH |
251 | } |
252 | ||
253 | ||
254 | ||
bc02af93 YG |
255 | int add_memory(int nid, u64 start, u64 size) |
256 | { | |
9af3c2de YG |
257 | pg_data_t *pgdat = NULL; |
258 | int new_pgdat = 0; | |
ebd15302 | 259 | struct resource *res; |
bc02af93 YG |
260 | int ret; |
261 | ||
ebd15302 KH |
262 | res = register_memory_resource(start, size); |
263 | if (!res) | |
264 | return -EEXIST; | |
265 | ||
9af3c2de YG |
266 | if (!node_online(nid)) { |
267 | pgdat = hotadd_new_pgdat(nid, start); | |
268 | if (!pgdat) | |
269 | return -ENOMEM; | |
270 | new_pgdat = 1; | |
271 | ret = kswapd_run(nid); | |
272 | if (ret) | |
273 | goto error; | |
274 | } | |
275 | ||
bc02af93 YG |
276 | /* call arch's memory hotadd */ |
277 | ret = arch_add_memory(nid, start, size); | |
278 | ||
9af3c2de YG |
279 | if (ret < 0) |
280 | goto error; | |
281 | ||
0fc44159 | 282 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
283 | node_set_online(nid); |
284 | ||
38837fc7 PJ |
285 | cpuset_track_online_nodes(); |
286 | ||
0fc44159 YG |
287 | if (new_pgdat) { |
288 | ret = register_one_node(nid); | |
289 | /* | |
290 | * If sysfs file of new node can't create, cpu on the node | |
291 | * can't be hot-added. There is no rollback way now. | |
292 | * So, check by BUG_ON() to catch it reluctantly.. | |
293 | */ | |
294 | BUG_ON(ret); | |
295 | } | |
296 | ||
9af3c2de YG |
297 | return ret; |
298 | error: | |
299 | /* rollback pgdat allocation and others */ | |
300 | if (new_pgdat) | |
301 | rollback_node_hotadd(nid, pgdat); | |
ebd15302 KH |
302 | if (res) |
303 | release_memory_resource(res); | |
9af3c2de | 304 | |
bc02af93 YG |
305 | return ret; |
306 | } | |
307 | EXPORT_SYMBOL_GPL(add_memory); |