Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/node.c - basic Node class support | |
3 | */ | |
4 | ||
5 | #include <linux/sysdev.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/mm.h> | |
c04fc586 | 9 | #include <linux/memory.h> |
1da177e4 LT |
10 | #include <linux/node.h> |
11 | #include <linux/hugetlb.h> | |
ed4a6d7f | 12 | #include <linux/compaction.h> |
1da177e4 LT |
13 | #include <linux/cpumask.h> |
14 | #include <linux/topology.h> | |
15 | #include <linux/nodemask.h> | |
76b67ed9 | 16 | #include <linux/cpu.h> |
bde631a5 | 17 | #include <linux/device.h> |
af936a16 | 18 | #include <linux/swap.h> |
18e5b539 | 19 | #include <linux/slab.h> |
1da177e4 | 20 | |
3701cde6 AK |
21 | static struct sysdev_class_attribute *node_state_attrs[]; |
22 | ||
1da177e4 | 23 | static struct sysdev_class node_class = { |
af5ca3f4 | 24 | .name = "node", |
3701cde6 | 25 | .attrs = node_state_attrs, |
1da177e4 LT |
26 | }; |
27 | ||
28 | ||
39106dcf | 29 | static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) |
1da177e4 LT |
30 | { |
31 | struct node *node_dev = to_node(dev); | |
a70f7302 | 32 | const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id); |
1da177e4 LT |
33 | int len; |
34 | ||
39106dcf MT |
35 | /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ |
36 | BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); | |
1da177e4 | 37 | |
39106dcf | 38 | len = type? |
29c0177e RR |
39 | cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : |
40 | cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
c5f59f08 MT |
41 | buf[len++] = '\n'; |
42 | buf[len] = '\0'; | |
1da177e4 LT |
43 | return len; |
44 | } | |
45 | ||
4a0b2b4d AK |
46 | static inline ssize_t node_read_cpumask(struct sys_device *dev, |
47 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
48 | { |
49 | return node_read_cpumap(dev, 0, buf); | |
50 | } | |
4a0b2b4d AK |
51 | static inline ssize_t node_read_cpulist(struct sys_device *dev, |
52 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
53 | { |
54 | return node_read_cpumap(dev, 1, buf); | |
55 | } | |
56 | ||
57 | static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); | |
58 | static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); | |
1da177e4 LT |
59 | |
60 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
4a0b2b4d AK |
61 | static ssize_t node_read_meminfo(struct sys_device * dev, |
62 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
63 | { |
64 | int n; | |
65 | int nid = dev->id; | |
66 | struct sysinfo i; | |
1da177e4 LT |
67 | |
68 | si_meminfo_node(&i, nid); | |
7ee92255 | 69 | n = sprintf(buf, |
4f98a2fe RR |
70 | "Node %d MemTotal: %8lu kB\n" |
71 | "Node %d MemFree: %8lu kB\n" | |
72 | "Node %d MemUsed: %8lu kB\n" | |
73 | "Node %d Active: %8lu kB\n" | |
74 | "Node %d Inactive: %8lu kB\n" | |
75 | "Node %d Active(anon): %8lu kB\n" | |
76 | "Node %d Inactive(anon): %8lu kB\n" | |
77 | "Node %d Active(file): %8lu kB\n" | |
78 | "Node %d Inactive(file): %8lu kB\n" | |
5344b7e6 | 79 | "Node %d Unevictable: %8lu kB\n" |
7ee92255 KM |
80 | "Node %d Mlocked: %8lu kB\n", |
81 | nid, K(i.totalram), | |
82 | nid, K(i.freeram), | |
83 | nid, K(i.totalram - i.freeram), | |
84 | nid, K(node_page_state(nid, NR_ACTIVE_ANON) + | |
85 | node_page_state(nid, NR_ACTIVE_FILE)), | |
86 | nid, K(node_page_state(nid, NR_INACTIVE_ANON) + | |
87 | node_page_state(nid, NR_INACTIVE_FILE)), | |
88 | nid, K(node_page_state(nid, NR_ACTIVE_ANON)), | |
89 | nid, K(node_page_state(nid, NR_INACTIVE_ANON)), | |
90 | nid, K(node_page_state(nid, NR_ACTIVE_FILE)), | |
91 | nid, K(node_page_state(nid, NR_INACTIVE_FILE)), | |
92 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), | |
93 | nid, K(node_page_state(nid, NR_MLOCK))); | |
94 | ||
182e8e23 | 95 | #ifdef CONFIG_HIGHMEM |
7ee92255 | 96 | n += sprintf(buf + n, |
4f98a2fe RR |
97 | "Node %d HighTotal: %8lu kB\n" |
98 | "Node %d HighFree: %8lu kB\n" | |
99 | "Node %d LowTotal: %8lu kB\n" | |
7ee92255 KM |
100 | "Node %d LowFree: %8lu kB\n", |
101 | nid, K(i.totalhigh), | |
102 | nid, K(i.freehigh), | |
103 | nid, K(i.totalram - i.totalhigh), | |
104 | nid, K(i.freeram - i.freehigh)); | |
182e8e23 | 105 | #endif |
7ee92255 | 106 | n += sprintf(buf + n, |
4f98a2fe RR |
107 | "Node %d Dirty: %8lu kB\n" |
108 | "Node %d Writeback: %8lu kB\n" | |
109 | "Node %d FilePages: %8lu kB\n" | |
110 | "Node %d Mapped: %8lu kB\n" | |
111 | "Node %d AnonPages: %8lu kB\n" | |
4b02108a | 112 | "Node %d Shmem: %8lu kB\n" |
c6a7f572 | 113 | "Node %d KernelStack: %8lu kB\n" |
4f98a2fe RR |
114 | "Node %d PageTables: %8lu kB\n" |
115 | "Node %d NFS_Unstable: %8lu kB\n" | |
116 | "Node %d Bounce: %8lu kB\n" | |
117 | "Node %d WritebackTmp: %8lu kB\n" | |
118 | "Node %d Slab: %8lu kB\n" | |
119 | "Node %d SReclaimable: %8lu kB\n" | |
120 | "Node %d SUnreclaim: %8lu kB\n", | |
b1e7a8fd | 121 | nid, K(node_page_state(nid, NR_FILE_DIRTY)), |
ce866b34 | 122 | nid, K(node_page_state(nid, NR_WRITEBACK)), |
347ce434 | 123 | nid, K(node_page_state(nid, NR_FILE_PAGES)), |
65ba55f5 | 124 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
f3dbd344 | 125 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
4b02108a | 126 | nid, K(node_page_state(nid, NR_SHMEM)), |
c6a7f572 KM |
127 | nid, node_page_state(nid, NR_KERNEL_STACK) * |
128 | THREAD_SIZE / 1024, | |
df849a15 | 129 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
fd39fc85 | 130 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
d2c5e30c | 131 | nid, K(node_page_state(nid, NR_BOUNCE)), |
fc3ba692 | 132 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
972d1a7b CL |
133 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + |
134 | node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), | |
135 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), | |
136 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); | |
1da177e4 LT |
137 | n += hugetlb_report_node_meminfo(nid, buf + n); |
138 | return n; | |
139 | } | |
140 | ||
141 | #undef K | |
142 | static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); | |
143 | ||
4a0b2b4d AK |
144 | static ssize_t node_read_numastat(struct sys_device * dev, |
145 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 | 146 | { |
1da177e4 LT |
147 | return sprintf(buf, |
148 | "numa_hit %lu\n" | |
149 | "numa_miss %lu\n" | |
150 | "numa_foreign %lu\n" | |
151 | "interleave_hit %lu\n" | |
152 | "local_node %lu\n" | |
153 | "other_node %lu\n", | |
ca889e6c CL |
154 | node_page_state(dev->id, NUMA_HIT), |
155 | node_page_state(dev->id, NUMA_MISS), | |
156 | node_page_state(dev->id, NUMA_FOREIGN), | |
157 | node_page_state(dev->id, NUMA_INTERLEAVE_HIT), | |
158 | node_page_state(dev->id, NUMA_LOCAL), | |
159 | node_page_state(dev->id, NUMA_OTHER)); | |
1da177e4 LT |
160 | } |
161 | static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); | |
162 | ||
4a0b2b4d AK |
163 | static ssize_t node_read_distance(struct sys_device * dev, |
164 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
165 | { |
166 | int nid = dev->id; | |
167 | int len = 0; | |
168 | int i; | |
169 | ||
12ee3c0a DR |
170 | /* |
171 | * buf is currently PAGE_SIZE in length and each node needs 4 chars | |
172 | * at the most (distance + space or newline). | |
173 | */ | |
174 | BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); | |
1da177e4 LT |
175 | |
176 | for_each_online_node(i) | |
177 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); | |
178 | ||
179 | len += sprintf(buf + len, "\n"); | |
180 | return len; | |
181 | } | |
182 | static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); | |
183 | ||
9a305230 LS |
184 | #ifdef CONFIG_HUGETLBFS |
185 | /* | |
186 | * hugetlbfs per node attributes registration interface: | |
187 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], | |
4faf8d95 LS |
188 | * it will register its per node attributes for all online nodes with |
189 | * memory. It will also call register_hugetlbfs_with_node(), below, to | |
9a305230 LS |
190 | * register its attribute registration functions with this node driver. |
191 | * Once these hooks have been initialized, the node driver will call into | |
192 | * the hugetlb module to [un]register attributes for hot-plugged nodes. | |
193 | */ | |
194 | static node_registration_func_t __hugetlb_register_node; | |
195 | static node_registration_func_t __hugetlb_unregister_node; | |
196 | ||
39da08cb | 197 | static inline bool hugetlb_register_node(struct node *node) |
9a305230 | 198 | { |
4faf8d95 | 199 | if (__hugetlb_register_node && |
39da08cb | 200 | node_state(node->sysdev.id, N_HIGH_MEMORY)) { |
9a305230 | 201 | __hugetlb_register_node(node); |
39da08cb LS |
202 | return true; |
203 | } | |
204 | return false; | |
9a305230 LS |
205 | } |
206 | ||
207 | static inline void hugetlb_unregister_node(struct node *node) | |
208 | { | |
209 | if (__hugetlb_unregister_node) | |
210 | __hugetlb_unregister_node(node); | |
211 | } | |
212 | ||
213 | void register_hugetlbfs_with_node(node_registration_func_t doregister, | |
214 | node_registration_func_t unregister) | |
215 | { | |
216 | __hugetlb_register_node = doregister; | |
217 | __hugetlb_unregister_node = unregister; | |
218 | } | |
219 | #else | |
220 | static inline void hugetlb_register_node(struct node *node) {} | |
221 | ||
222 | static inline void hugetlb_unregister_node(struct node *node) {} | |
223 | #endif | |
224 | ||
1da177e4 LT |
225 | |
226 | /* | |
405ae7d3 | 227 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
228 | * @num - Node number to use when creating the device. |
229 | * | |
230 | * Initialize and register the node device. | |
231 | */ | |
4b45099b | 232 | int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
233 | { |
234 | int error; | |
235 | ||
236 | node->sysdev.id = num; | |
237 | node->sysdev.cls = &node_class; | |
238 | error = sysdev_register(&node->sysdev); | |
239 | ||
240 | if (!error){ | |
241 | sysdev_create_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 242 | sysdev_create_file(&node->sysdev, &attr_cpulist); |
1da177e4 LT |
243 | sysdev_create_file(&node->sysdev, &attr_meminfo); |
244 | sysdev_create_file(&node->sysdev, &attr_numastat); | |
245 | sysdev_create_file(&node->sysdev, &attr_distance); | |
af936a16 LS |
246 | |
247 | scan_unevictable_register_node(node); | |
4faf8d95 | 248 | |
9a305230 | 249 | hugetlb_register_node(node); |
ed4a6d7f MG |
250 | |
251 | compaction_register_node(node); | |
1da177e4 LT |
252 | } |
253 | return error; | |
254 | } | |
255 | ||
4b45099b KT |
256 | /** |
257 | * unregister_node - unregister a node device | |
258 | * @node: node going away | |
259 | * | |
260 | * Unregisters a node device @node. All the devices on the node must be | |
261 | * unregistered before calling this function. | |
262 | */ | |
263 | void unregister_node(struct node *node) | |
264 | { | |
265 | sysdev_remove_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 266 | sysdev_remove_file(&node->sysdev, &attr_cpulist); |
4b45099b KT |
267 | sysdev_remove_file(&node->sysdev, &attr_meminfo); |
268 | sysdev_remove_file(&node->sysdev, &attr_numastat); | |
269 | sysdev_remove_file(&node->sysdev, &attr_distance); | |
270 | ||
af936a16 | 271 | scan_unevictable_unregister_node(node); |
4faf8d95 | 272 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
af936a16 | 273 | |
4b45099b KT |
274 | sysdev_unregister(&node->sysdev); |
275 | } | |
1da177e4 | 276 | |
0fc44159 YG |
277 | struct node node_devices[MAX_NUMNODES]; |
278 | ||
76b67ed9 KH |
279 | /* |
280 | * register cpu under node | |
281 | */ | |
282 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
283 | { | |
1830794a | 284 | int ret; |
f8246f31 | 285 | struct sys_device *obj; |
76b67ed9 | 286 | |
f8246f31 AC |
287 | if (!node_online(nid)) |
288 | return 0; | |
289 | ||
290 | obj = get_cpu_sysdev(cpu); | |
291 | if (!obj) | |
292 | return 0; | |
293 | ||
1830794a | 294 | ret = sysfs_create_link(&node_devices[nid].sysdev.kobj, |
f8246f31 AC |
295 | &obj->kobj, |
296 | kobject_name(&obj->kobj)); | |
1830794a AC |
297 | if (ret) |
298 | return ret; | |
299 | ||
300 | return sysfs_create_link(&obj->kobj, | |
301 | &node_devices[nid].sysdev.kobj, | |
302 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
76b67ed9 KH |
303 | } |
304 | ||
305 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) | |
306 | { | |
b9d52dad AC |
307 | struct sys_device *obj; |
308 | ||
309 | if (!node_online(nid)) | |
310 | return 0; | |
311 | ||
312 | obj = get_cpu_sysdev(cpu); | |
313 | if (!obj) | |
314 | return 0; | |
315 | ||
316 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
317 | kobject_name(&obj->kobj)); | |
1830794a AC |
318 | sysfs_remove_link(&obj->kobj, |
319 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
b9d52dad | 320 | |
76b67ed9 KH |
321 | return 0; |
322 | } | |
323 | ||
c04fc586 GH |
324 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
325 | #define page_initialized(page) (page->lru.next) | |
326 | ||
327 | static int get_nid_for_pfn(unsigned long pfn) | |
328 | { | |
329 | struct page *page; | |
330 | ||
331 | if (!pfn_valid_within(pfn)) | |
332 | return -1; | |
333 | page = pfn_to_page(pfn); | |
334 | if (!page_initialized(page)) | |
335 | return -1; | |
336 | return pfn_to_nid(pfn); | |
337 | } | |
338 | ||
339 | /* register memory section under specified node if it spans that node */ | |
340 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) | |
341 | { | |
dee5d0d5 | 342 | int ret; |
c04fc586 GH |
343 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
344 | ||
345 | if (!mem_blk) | |
346 | return -EFAULT; | |
347 | if (!node_online(nid)) | |
348 | return 0; | |
349 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); | |
350 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
351 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
352 | int page_nid; | |
353 | ||
354 | page_nid = get_nid_for_pfn(pfn); | |
355 | if (page_nid < 0) | |
356 | continue; | |
357 | if (page_nid != nid) | |
358 | continue; | |
dee5d0d5 | 359 | ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, |
c04fc586 GH |
360 | &mem_blk->sysdev.kobj, |
361 | kobject_name(&mem_blk->sysdev.kobj)); | |
dee5d0d5 AC |
362 | if (ret) |
363 | return ret; | |
364 | ||
365 | return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj, | |
366 | &node_devices[nid].sysdev.kobj, | |
367 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
c04fc586 GH |
368 | } |
369 | /* mem section does not span the specified node */ | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /* unregister memory section under all nodes that it spans */ | |
374 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) | |
375 | { | |
9ae49fab | 376 | NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); |
c04fc586 GH |
377 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
378 | ||
9ae49fab DR |
379 | if (!mem_blk) { |
380 | NODEMASK_FREE(unlinked_nodes); | |
c04fc586 | 381 | return -EFAULT; |
9ae49fab DR |
382 | } |
383 | if (!unlinked_nodes) | |
384 | return -ENOMEM; | |
385 | nodes_clear(*unlinked_nodes); | |
c04fc586 GH |
386 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); |
387 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
388 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
47504980 | 389 | int nid; |
c04fc586 GH |
390 | |
391 | nid = get_nid_for_pfn(pfn); | |
392 | if (nid < 0) | |
393 | continue; | |
394 | if (!node_online(nid)) | |
395 | continue; | |
9ae49fab | 396 | if (node_test_and_set(nid, *unlinked_nodes)) |
c04fc586 GH |
397 | continue; |
398 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
399 | kobject_name(&mem_blk->sysdev.kobj)); | |
dee5d0d5 AC |
400 | sysfs_remove_link(&mem_blk->sysdev.kobj, |
401 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
c04fc586 | 402 | } |
9ae49fab | 403 | NODEMASK_FREE(unlinked_nodes); |
c04fc586 GH |
404 | return 0; |
405 | } | |
406 | ||
407 | static int link_mem_sections(int nid) | |
408 | { | |
409 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; | |
410 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; | |
411 | unsigned long pfn; | |
412 | int err = 0; | |
413 | ||
414 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
415 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
416 | struct mem_section *mem_sect; | |
417 | struct memory_block *mem_blk; | |
418 | int ret; | |
419 | ||
420 | if (!present_section_nr(section_nr)) | |
421 | continue; | |
422 | mem_sect = __nr_to_section(section_nr); | |
423 | mem_blk = find_memory_block(mem_sect); | |
424 | ret = register_mem_sect_under_node(mem_blk, nid); | |
425 | if (!err) | |
426 | err = ret; | |
427 | ||
428 | /* discard ref obtained in find_memory_block() */ | |
429 | kobject_put(&mem_blk->sysdev.kobj); | |
430 | } | |
431 | return err; | |
432 | } | |
4faf8d95 | 433 | |
39da08cb | 434 | #ifdef CONFIG_HUGETLBFS |
4faf8d95 LS |
435 | /* |
436 | * Handle per node hstate attribute [un]registration on transistions | |
437 | * to/from memoryless state. | |
438 | */ | |
39da08cb LS |
439 | static void node_hugetlb_work(struct work_struct *work) |
440 | { | |
441 | struct node *node = container_of(work, struct node, node_work); | |
442 | ||
443 | /* | |
444 | * We only get here when a node transitions to/from memoryless state. | |
445 | * We can detect which transition occurred by examining whether the | |
446 | * node has memory now. hugetlb_register_node() already check this | |
447 | * so we try to register the attributes. If that fails, then the | |
448 | * node has transitioned to memoryless, try to unregister the | |
449 | * attributes. | |
450 | */ | |
451 | if (!hugetlb_register_node(node)) | |
452 | hugetlb_unregister_node(node); | |
453 | } | |
454 | ||
455 | static void init_node_hugetlb_work(int nid) | |
456 | { | |
457 | INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); | |
458 | } | |
4faf8d95 LS |
459 | |
460 | static int node_memory_callback(struct notifier_block *self, | |
461 | unsigned long action, void *arg) | |
462 | { | |
463 | struct memory_notify *mnb = arg; | |
464 | int nid = mnb->status_change_nid; | |
465 | ||
466 | switch (action) { | |
39da08cb LS |
467 | case MEM_ONLINE: |
468 | case MEM_OFFLINE: | |
469 | /* | |
470 | * offload per node hstate [un]registration to a work thread | |
471 | * when transitioning to/from memoryless state. | |
472 | */ | |
4faf8d95 | 473 | if (nid != NUMA_NO_NODE) |
39da08cb | 474 | schedule_work(&node_devices[nid].node_work); |
4faf8d95 | 475 | break; |
39da08cb | 476 | |
4faf8d95 LS |
477 | case MEM_GOING_ONLINE: |
478 | case MEM_GOING_OFFLINE: | |
479 | case MEM_CANCEL_ONLINE: | |
480 | case MEM_CANCEL_OFFLINE: | |
481 | default: | |
482 | break; | |
483 | } | |
484 | ||
485 | return NOTIFY_OK; | |
486 | } | |
39da08cb LS |
487 | #endif /* CONFIG_HUGETLBFS */ |
488 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ | |
489 | ||
c04fc586 | 490 | static int link_mem_sections(int nid) { return 0; } |
39da08cb | 491 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d95 | 492 | |
39da08cb LS |
493 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
494 | !defined(CONFIG_HUGETLBFS) | |
4faf8d95 LS |
495 | static inline int node_memory_callback(struct notifier_block *self, |
496 | unsigned long action, void *arg) | |
497 | { | |
498 | return NOTIFY_OK; | |
499 | } | |
39da08cb LS |
500 | |
501 | static void init_node_hugetlb_work(int nid) { } | |
502 | ||
503 | #endif | |
c04fc586 | 504 | |
0fc44159 YG |
505 | int register_one_node(int nid) |
506 | { | |
507 | int error = 0; | |
76b67ed9 | 508 | int cpu; |
0fc44159 YG |
509 | |
510 | if (node_online(nid)) { | |
511 | int p_node = parent_node(nid); | |
512 | struct node *parent = NULL; | |
513 | ||
514 | if (p_node != nid) | |
515 | parent = &node_devices[p_node]; | |
516 | ||
517 | error = register_node(&node_devices[nid], nid, parent); | |
76b67ed9 KH |
518 | |
519 | /* link cpu under this node */ | |
520 | for_each_present_cpu(cpu) { | |
521 | if (cpu_to_node(cpu) == nid) | |
522 | register_cpu_under_node(cpu, nid); | |
523 | } | |
c04fc586 GH |
524 | |
525 | /* link memory sections under this node */ | |
526 | error = link_mem_sections(nid); | |
39da08cb LS |
527 | |
528 | /* initialize work queue for memory hot plug */ | |
529 | init_node_hugetlb_work(nid); | |
0fc44159 YG |
530 | } |
531 | ||
532 | return error; | |
533 | ||
534 | } | |
535 | ||
536 | void unregister_one_node(int nid) | |
537 | { | |
538 | unregister_node(&node_devices[nid]); | |
539 | } | |
540 | ||
bde631a5 LS |
541 | /* |
542 | * node states attributes | |
543 | */ | |
544 | ||
545 | static ssize_t print_nodes_state(enum node_states state, char *buf) | |
546 | { | |
547 | int n; | |
548 | ||
549 | n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); | |
550 | if (n > 0 && PAGE_SIZE > n + 1) { | |
551 | *(buf + n++) = '\n'; | |
552 | *(buf + n++) = '\0'; | |
553 | } | |
554 | return n; | |
555 | } | |
556 | ||
b15f562f AK |
557 | struct node_attr { |
558 | struct sysdev_class_attribute attr; | |
559 | enum node_states state; | |
560 | }; | |
bde631a5 | 561 | |
b15f562f AK |
562 | static ssize_t show_node_state(struct sysdev_class *class, |
563 | struct sysdev_class_attribute *attr, char *buf) | |
bde631a5 | 564 | { |
b15f562f AK |
565 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
566 | return print_nodes_state(na->state, buf); | |
bde631a5 LS |
567 | } |
568 | ||
b15f562f AK |
569 | #define _NODE_ATTR(name, state) \ |
570 | { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state } | |
bde631a5 | 571 | |
b15f562f AK |
572 | static struct node_attr node_state_attr[] = { |
573 | _NODE_ATTR(possible, N_POSSIBLE), | |
574 | _NODE_ATTR(online, N_ONLINE), | |
575 | _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), | |
576 | _NODE_ATTR(has_cpu, N_CPU), | |
bde631a5 | 577 | #ifdef CONFIG_HIGHMEM |
b15f562f | 578 | _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
bde631a5 | 579 | #endif |
bde631a5 LS |
580 | }; |
581 | ||
3701cde6 AK |
582 | static struct sysdev_class_attribute *node_state_attrs[] = { |
583 | &node_state_attr[0].attr, | |
584 | &node_state_attr[1].attr, | |
585 | &node_state_attr[2].attr, | |
586 | &node_state_attr[3].attr, | |
587 | #ifdef CONFIG_HIGHMEM | |
588 | &node_state_attr[4].attr, | |
589 | #endif | |
590 | NULL | |
591 | }; | |
bde631a5 | 592 | |
4faf8d95 | 593 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b | 594 | static int __init register_node_type(void) |
1da177e4 | 595 | { |
bde631a5 LS |
596 | int ret; |
597 | ||
3701cde6 AK |
598 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
599 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); | |
600 | ||
bde631a5 | 601 | ret = sysdev_class_register(&node_class); |
4faf8d95 | 602 | if (!ret) { |
4faf8d95 LS |
603 | hotplug_memory_notifier(node_memory_callback, |
604 | NODE_CALLBACK_PRI); | |
605 | } | |
bde631a5 LS |
606 | |
607 | /* | |
608 | * Note: we're not going to unregister the node class if we fail | |
609 | * to register the node state class attribute files. | |
610 | */ | |
611 | return ret; | |
1da177e4 LT |
612 | } |
613 | postcore_initcall(register_node_type); |