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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> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/sysctl.h> | |
18 | #include <linux/cpu.h> | |
19 | #include <linux/memory.h> | |
20 | #include <linux/memory_hotplug.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/vmalloc.h> | |
0a547039 | 23 | #include <linux/ioport.h> |
38837fc7 | 24 | #include <linux/cpuset.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 | ||
ebd15302 KH |
56 | if (pfn_valid(phys_start_pfn)) |
57 | return -EEXIST; | |
58 | ||
0b0acbec | 59 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
60 | |
61 | if (ret < 0) | |
62 | return ret; | |
63 | ||
718127cc YG |
64 | ret = __add_zone(zone, phys_start_pfn); |
65 | ||
66 | if (ret < 0) | |
67 | return ret; | |
68 | ||
3947be19 DH |
69 | return register_new_memory(__pfn_to_section(phys_start_pfn)); |
70 | } | |
71 | ||
72 | /* | |
73 | * Reasonably generic function for adding memory. It is | |
74 | * expected that archs that support memory hotplug will | |
75 | * call this function after deciding the zone to which to | |
76 | * add the new pages. | |
77 | */ | |
78 | int __add_pages(struct zone *zone, unsigned long phys_start_pfn, | |
79 | unsigned long nr_pages) | |
80 | { | |
81 | unsigned long i; | |
82 | int err = 0; | |
6f712711 KH |
83 | int start_sec, end_sec; |
84 | /* during initialize mem_map, align hot-added range to section */ | |
85 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
86 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
3947be19 | 87 | |
6f712711 KH |
88 | for (i = start_sec; i <= end_sec; i++) { |
89 | err = __add_section(zone, i << PFN_SECTION_SHIFT); | |
3947be19 | 90 | |
6f712711 KH |
91 | /* |
92 | * EEXIST is finally dealed with by ioresource collision | |
93 | * check. see add_memory() => register_memory_resource() | |
94 | * Warning will be printed if there is collision. | |
bed120c6 JS |
95 | */ |
96 | if (err && (err != -EEXIST)) | |
3947be19 | 97 | break; |
6f712711 | 98 | err = 0; |
3947be19 DH |
99 | } |
100 | ||
101 | return err; | |
102 | } | |
bed120c6 | 103 | EXPORT_SYMBOL_GPL(__add_pages); |
3947be19 DH |
104 | |
105 | static void grow_zone_span(struct zone *zone, | |
106 | unsigned long start_pfn, unsigned long end_pfn) | |
107 | { | |
108 | unsigned long old_zone_end_pfn; | |
109 | ||
110 | zone_span_writelock(zone); | |
111 | ||
112 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
113 | if (start_pfn < zone->zone_start_pfn) | |
114 | zone->zone_start_pfn = start_pfn; | |
115 | ||
25a6df95 YG |
116 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
117 | zone->zone_start_pfn; | |
3947be19 DH |
118 | |
119 | zone_span_writeunlock(zone); | |
120 | } | |
121 | ||
122 | static void grow_pgdat_span(struct pglist_data *pgdat, | |
123 | unsigned long start_pfn, unsigned long end_pfn) | |
124 | { | |
125 | unsigned long old_pgdat_end_pfn = | |
126 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
127 | ||
128 | if (start_pfn < pgdat->node_start_pfn) | |
129 | pgdat->node_start_pfn = start_pfn; | |
130 | ||
25a6df95 YG |
131 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
132 | pgdat->node_start_pfn; | |
3947be19 DH |
133 | } |
134 | ||
135 | int online_pages(unsigned long pfn, unsigned long nr_pages) | |
136 | { | |
137 | unsigned long i; | |
138 | unsigned long flags; | |
139 | unsigned long onlined_pages = 0; | |
2842f114 KH |
140 | struct resource res; |
141 | u64 section_end; | |
142 | unsigned long start_pfn; | |
3947be19 | 143 | struct zone *zone; |
6811378e | 144 | int need_zonelists_rebuild = 0; |
3947be19 DH |
145 | |
146 | /* | |
147 | * This doesn't need a lock to do pfn_to_page(). | |
148 | * The section can't be removed here because of the | |
149 | * memory_block->state_sem. | |
150 | */ | |
151 | zone = page_zone(pfn_to_page(pfn)); | |
152 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
153 | grow_zone_span(zone, pfn, pfn + nr_pages); | |
154 | grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages); | |
155 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
156 | ||
6811378e YG |
157 | /* |
158 | * If this zone is not populated, then it is not in zonelist. | |
159 | * This means the page allocator ignores this zone. | |
160 | * So, zonelist must be updated after online. | |
161 | */ | |
162 | if (!populated_zone(zone)) | |
163 | need_zonelists_rebuild = 1; | |
164 | ||
2842f114 KH |
165 | res.start = (u64)pfn << PAGE_SHIFT; |
166 | res.end = res.start + ((u64)nr_pages << PAGE_SHIFT) - 1; | |
167 | res.flags = IORESOURCE_MEM; /* we just need system ram */ | |
168 | section_end = res.end; | |
169 | ||
58c1b5b0 | 170 | while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) { |
2842f114 KH |
171 | start_pfn = (unsigned long)(res.start >> PAGE_SHIFT); |
172 | nr_pages = (unsigned long) | |
173 | ((res.end + 1 - res.start) >> PAGE_SHIFT); | |
174 | ||
175 | if (PageReserved(pfn_to_page(start_pfn))) { | |
176 | /* this region's page is not onlined now */ | |
177 | for (i = 0; i < nr_pages; i++) { | |
178 | struct page *page = pfn_to_page(start_pfn + i); | |
179 | online_page(page); | |
180 | onlined_pages++; | |
181 | } | |
182 | } | |
183 | ||
184 | res.start = res.end + 1; | |
185 | res.end = section_end; | |
3947be19 DH |
186 | } |
187 | zone->present_pages += onlined_pages; | |
f2937be5 | 188 | zone->zone_pgdat->node_present_pages += onlined_pages; |
3947be19 | 189 | |
61b13993 DH |
190 | setup_per_zone_pages_min(); |
191 | ||
6811378e YG |
192 | if (need_zonelists_rebuild) |
193 | build_all_zonelists(); | |
5a4d4361 | 194 | vm_total_pages = nr_free_pagecache_pages(); |
3947be19 DH |
195 | return 0; |
196 | } | |
bc02af93 | 197 | |
9af3c2de YG |
198 | static pg_data_t *hotadd_new_pgdat(int nid, u64 start) |
199 | { | |
200 | struct pglist_data *pgdat; | |
201 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
202 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
203 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
204 | ||
205 | pgdat = arch_alloc_nodedata(nid); | |
206 | if (!pgdat) | |
207 | return NULL; | |
208 | ||
209 | arch_refresh_nodedata(nid, pgdat); | |
210 | ||
211 | /* we can use NODE_DATA(nid) from here */ | |
212 | ||
213 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
214 | free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size); | |
215 | ||
216 | return pgdat; | |
217 | } | |
218 | ||
219 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
220 | { | |
221 | arch_refresh_nodedata(nid, NULL); | |
222 | arch_free_nodedata(pgdat); | |
223 | return; | |
224 | } | |
225 | ||
0a547039 | 226 | /* add this memory to iomem resource */ |
ebd15302 | 227 | static struct resource *register_memory_resource(u64 start, u64 size) |
0a547039 KH |
228 | { |
229 | struct resource *res; | |
0a547039 KH |
230 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
231 | BUG_ON(!res); | |
232 | ||
233 | res->name = "System RAM"; | |
234 | res->start = start; | |
235 | res->end = start + size - 1; | |
236 | res->flags = IORESOURCE_MEM; | |
237 | if (request_resource(&iomem_resource, res) < 0) { | |
238 | printk("System RAM resource %llx - %llx cannot be added\n", | |
239 | (unsigned long long)res->start, (unsigned long long)res->end); | |
240 | kfree(res); | |
ebd15302 | 241 | res = NULL; |
0a547039 | 242 | } |
ebd15302 KH |
243 | return res; |
244 | } | |
245 | ||
246 | static void release_memory_resource(struct resource *res) | |
247 | { | |
248 | if (!res) | |
249 | return; | |
250 | release_resource(res); | |
251 | kfree(res); | |
252 | return; | |
0a547039 KH |
253 | } |
254 | ||
255 | ||
256 | ||
bc02af93 YG |
257 | int add_memory(int nid, u64 start, u64 size) |
258 | { | |
9af3c2de YG |
259 | pg_data_t *pgdat = NULL; |
260 | int new_pgdat = 0; | |
ebd15302 | 261 | struct resource *res; |
bc02af93 YG |
262 | int ret; |
263 | ||
ebd15302 KH |
264 | res = register_memory_resource(start, size); |
265 | if (!res) | |
266 | return -EEXIST; | |
267 | ||
9af3c2de YG |
268 | if (!node_online(nid)) { |
269 | pgdat = hotadd_new_pgdat(nid, start); | |
270 | if (!pgdat) | |
271 | return -ENOMEM; | |
272 | new_pgdat = 1; | |
273 | ret = kswapd_run(nid); | |
274 | if (ret) | |
275 | goto error; | |
276 | } | |
277 | ||
bc02af93 YG |
278 | /* call arch's memory hotadd */ |
279 | ret = arch_add_memory(nid, start, size); | |
280 | ||
9af3c2de YG |
281 | if (ret < 0) |
282 | goto error; | |
283 | ||
0fc44159 | 284 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
285 | node_set_online(nid); |
286 | ||
38837fc7 PJ |
287 | cpuset_track_online_nodes(); |
288 | ||
0fc44159 YG |
289 | if (new_pgdat) { |
290 | ret = register_one_node(nid); | |
291 | /* | |
292 | * If sysfs file of new node can't create, cpu on the node | |
293 | * can't be hot-added. There is no rollback way now. | |
294 | * So, check by BUG_ON() to catch it reluctantly.. | |
295 | */ | |
296 | BUG_ON(ret); | |
297 | } | |
298 | ||
9af3c2de YG |
299 | return ret; |
300 | error: | |
301 | /* rollback pgdat allocation and others */ | |
302 | if (new_pgdat) | |
303 | rollback_node_hotadd(nid, pgdat); | |
ebd15302 KH |
304 | if (res) |
305 | release_memory_resource(res); | |
9af3c2de | 306 | |
bc02af93 YG |
307 | return ret; |
308 | } | |
309 | EXPORT_SYMBOL_GPL(add_memory); |