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> | |
12 | #include <linux/cpumask.h> | |
13 | #include <linux/topology.h> | |
14 | #include <linux/nodemask.h> | |
76b67ed9 | 15 | #include <linux/cpu.h> |
bde631a5 | 16 | #include <linux/device.h> |
af936a16 | 17 | #include <linux/swap.h> |
1da177e4 LT |
18 | |
19 | static struct sysdev_class node_class = { | |
af5ca3f4 | 20 | .name = "node", |
1da177e4 LT |
21 | }; |
22 | ||
23 | ||
39106dcf | 24 | static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) |
1da177e4 LT |
25 | { |
26 | struct node *node_dev = to_node(dev); | |
a70f7302 | 27 | const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id); |
1da177e4 LT |
28 | int len; |
29 | ||
39106dcf MT |
30 | /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ |
31 | BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); | |
1da177e4 | 32 | |
39106dcf | 33 | len = type? |
29c0177e RR |
34 | cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : |
35 | cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
c5f59f08 MT |
36 | buf[len++] = '\n'; |
37 | buf[len] = '\0'; | |
1da177e4 LT |
38 | return len; |
39 | } | |
40 | ||
4a0b2b4d AK |
41 | static inline ssize_t node_read_cpumask(struct sys_device *dev, |
42 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
43 | { |
44 | return node_read_cpumap(dev, 0, buf); | |
45 | } | |
4a0b2b4d AK |
46 | static inline ssize_t node_read_cpulist(struct sys_device *dev, |
47 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
48 | { |
49 | return node_read_cpumap(dev, 1, buf); | |
50 | } | |
51 | ||
52 | static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); | |
53 | static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); | |
1da177e4 LT |
54 | |
55 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
4a0b2b4d AK |
56 | static ssize_t node_read_meminfo(struct sys_device * dev, |
57 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
58 | { |
59 | int n; | |
60 | int nid = dev->id; | |
61 | struct sysinfo i; | |
1da177e4 LT |
62 | |
63 | si_meminfo_node(&i, nid); | |
c07e02db | 64 | |
1da177e4 | 65 | n = sprintf(buf, "\n" |
4f98a2fe RR |
66 | "Node %d MemTotal: %8lu kB\n" |
67 | "Node %d MemFree: %8lu kB\n" | |
68 | "Node %d MemUsed: %8lu kB\n" | |
69 | "Node %d Active: %8lu kB\n" | |
70 | "Node %d Inactive: %8lu kB\n" | |
71 | "Node %d Active(anon): %8lu kB\n" | |
72 | "Node %d Inactive(anon): %8lu kB\n" | |
73 | "Node %d Active(file): %8lu kB\n" | |
74 | "Node %d Inactive(file): %8lu kB\n" | |
5344b7e6 NP |
75 | "Node %d Unevictable: %8lu kB\n" |
76 | "Node %d Mlocked: %8lu kB\n" | |
182e8e23 | 77 | #ifdef CONFIG_HIGHMEM |
4f98a2fe RR |
78 | "Node %d HighTotal: %8lu kB\n" |
79 | "Node %d HighFree: %8lu kB\n" | |
80 | "Node %d LowTotal: %8lu kB\n" | |
81 | "Node %d LowFree: %8lu kB\n" | |
182e8e23 | 82 | #endif |
4f98a2fe RR |
83 | "Node %d Dirty: %8lu kB\n" |
84 | "Node %d Writeback: %8lu kB\n" | |
85 | "Node %d FilePages: %8lu kB\n" | |
86 | "Node %d Mapped: %8lu kB\n" | |
87 | "Node %d AnonPages: %8lu kB\n" | |
4b02108a | 88 | "Node %d Shmem: %8lu kB\n" |
c6a7f572 | 89 | "Node %d KernelStack: %8lu kB\n" |
4f98a2fe RR |
90 | "Node %d PageTables: %8lu kB\n" |
91 | "Node %d NFS_Unstable: %8lu kB\n" | |
92 | "Node %d Bounce: %8lu kB\n" | |
93 | "Node %d WritebackTmp: %8lu kB\n" | |
94 | "Node %d Slab: %8lu kB\n" | |
95 | "Node %d SReclaimable: %8lu kB\n" | |
96 | "Node %d SUnreclaim: %8lu kB\n", | |
1da177e4 LT |
97 | nid, K(i.totalram), |
98 | nid, K(i.freeram), | |
99 | nid, K(i.totalram - i.freeram), | |
4f98a2fe RR |
100 | nid, K(node_page_state(nid, NR_ACTIVE_ANON) + |
101 | node_page_state(nid, NR_ACTIVE_FILE)), | |
102 | nid, K(node_page_state(nid, NR_INACTIVE_ANON) + | |
103 | node_page_state(nid, NR_INACTIVE_FILE)), | |
104 | nid, K(node_page_state(nid, NR_ACTIVE_ANON)), | |
105 | nid, K(node_page_state(nid, NR_INACTIVE_ANON)), | |
106 | nid, K(node_page_state(nid, NR_ACTIVE_FILE)), | |
107 | nid, K(node_page_state(nid, NR_INACTIVE_FILE)), | |
7b854121 | 108 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), |
5344b7e6 | 109 | nid, K(node_page_state(nid, NR_MLOCK)), |
182e8e23 | 110 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
111 | nid, K(i.totalhigh), |
112 | nid, K(i.freehigh), | |
113 | nid, K(i.totalram - i.totalhigh), | |
c07e02db | 114 | nid, K(i.freeram - i.freehigh), |
182e8e23 | 115 | #endif |
b1e7a8fd | 116 | nid, K(node_page_state(nid, NR_FILE_DIRTY)), |
ce866b34 | 117 | nid, K(node_page_state(nid, NR_WRITEBACK)), |
347ce434 | 118 | nid, K(node_page_state(nid, NR_FILE_PAGES)), |
65ba55f5 | 119 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
f3dbd344 | 120 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
4b02108a | 121 | nid, K(node_page_state(nid, NR_SHMEM)), |
c6a7f572 KM |
122 | nid, node_page_state(nid, NR_KERNEL_STACK) * |
123 | THREAD_SIZE / 1024, | |
df849a15 | 124 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
fd39fc85 | 125 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
d2c5e30c | 126 | nid, K(node_page_state(nid, NR_BOUNCE)), |
fc3ba692 | 127 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
972d1a7b CL |
128 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + |
129 | node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), | |
130 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), | |
131 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); | |
1da177e4 LT |
132 | n += hugetlb_report_node_meminfo(nid, buf + n); |
133 | return n; | |
134 | } | |
135 | ||
136 | #undef K | |
137 | static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); | |
138 | ||
4a0b2b4d AK |
139 | static ssize_t node_read_numastat(struct sys_device * dev, |
140 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 | 141 | { |
1da177e4 LT |
142 | return sprintf(buf, |
143 | "numa_hit %lu\n" | |
144 | "numa_miss %lu\n" | |
145 | "numa_foreign %lu\n" | |
146 | "interleave_hit %lu\n" | |
147 | "local_node %lu\n" | |
148 | "other_node %lu\n", | |
ca889e6c CL |
149 | node_page_state(dev->id, NUMA_HIT), |
150 | node_page_state(dev->id, NUMA_MISS), | |
151 | node_page_state(dev->id, NUMA_FOREIGN), | |
152 | node_page_state(dev->id, NUMA_INTERLEAVE_HIT), | |
153 | node_page_state(dev->id, NUMA_LOCAL), | |
154 | node_page_state(dev->id, NUMA_OTHER)); | |
1da177e4 LT |
155 | } |
156 | static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); | |
157 | ||
4a0b2b4d AK |
158 | static ssize_t node_read_distance(struct sys_device * dev, |
159 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
160 | { |
161 | int nid = dev->id; | |
162 | int len = 0; | |
163 | int i; | |
164 | ||
165 | /* buf currently PAGE_SIZE, need ~4 chars per node */ | |
166 | BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); | |
167 | ||
168 | for_each_online_node(i) | |
169 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); | |
170 | ||
171 | len += sprintf(buf + len, "\n"); | |
172 | return len; | |
173 | } | |
174 | static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); | |
175 | ||
9a305230 LS |
176 | #ifdef CONFIG_HUGETLBFS |
177 | /* | |
178 | * hugetlbfs per node attributes registration interface: | |
179 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], | |
4faf8d95 LS |
180 | * it will register its per node attributes for all online nodes with |
181 | * memory. It will also call register_hugetlbfs_with_node(), below, to | |
9a305230 LS |
182 | * register its attribute registration functions with this node driver. |
183 | * Once these hooks have been initialized, the node driver will call into | |
184 | * the hugetlb module to [un]register attributes for hot-plugged nodes. | |
185 | */ | |
186 | static node_registration_func_t __hugetlb_register_node; | |
187 | static node_registration_func_t __hugetlb_unregister_node; | |
188 | ||
39da08cb | 189 | static inline bool hugetlb_register_node(struct node *node) |
9a305230 | 190 | { |
4faf8d95 | 191 | if (__hugetlb_register_node && |
39da08cb | 192 | node_state(node->sysdev.id, N_HIGH_MEMORY)) { |
9a305230 | 193 | __hugetlb_register_node(node); |
39da08cb LS |
194 | return true; |
195 | } | |
196 | return false; | |
9a305230 LS |
197 | } |
198 | ||
199 | static inline void hugetlb_unregister_node(struct node *node) | |
200 | { | |
201 | if (__hugetlb_unregister_node) | |
202 | __hugetlb_unregister_node(node); | |
203 | } | |
204 | ||
205 | void register_hugetlbfs_with_node(node_registration_func_t doregister, | |
206 | node_registration_func_t unregister) | |
207 | { | |
208 | __hugetlb_register_node = doregister; | |
209 | __hugetlb_unregister_node = unregister; | |
210 | } | |
211 | #else | |
212 | static inline void hugetlb_register_node(struct node *node) {} | |
213 | ||
214 | static inline void hugetlb_unregister_node(struct node *node) {} | |
215 | #endif | |
216 | ||
1da177e4 LT |
217 | |
218 | /* | |
405ae7d3 | 219 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
220 | * @num - Node number to use when creating the device. |
221 | * | |
222 | * Initialize and register the node device. | |
223 | */ | |
4b45099b | 224 | int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
225 | { |
226 | int error; | |
227 | ||
228 | node->sysdev.id = num; | |
229 | node->sysdev.cls = &node_class; | |
230 | error = sysdev_register(&node->sysdev); | |
231 | ||
232 | if (!error){ | |
233 | sysdev_create_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 234 | sysdev_create_file(&node->sysdev, &attr_cpulist); |
1da177e4 LT |
235 | sysdev_create_file(&node->sysdev, &attr_meminfo); |
236 | sysdev_create_file(&node->sysdev, &attr_numastat); | |
237 | sysdev_create_file(&node->sysdev, &attr_distance); | |
af936a16 LS |
238 | |
239 | scan_unevictable_register_node(node); | |
4faf8d95 | 240 | |
9a305230 | 241 | hugetlb_register_node(node); |
1da177e4 LT |
242 | } |
243 | return error; | |
244 | } | |
245 | ||
4b45099b KT |
246 | /** |
247 | * unregister_node - unregister a node device | |
248 | * @node: node going away | |
249 | * | |
250 | * Unregisters a node device @node. All the devices on the node must be | |
251 | * unregistered before calling this function. | |
252 | */ | |
253 | void unregister_node(struct node *node) | |
254 | { | |
255 | sysdev_remove_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 256 | sysdev_remove_file(&node->sysdev, &attr_cpulist); |
4b45099b KT |
257 | sysdev_remove_file(&node->sysdev, &attr_meminfo); |
258 | sysdev_remove_file(&node->sysdev, &attr_numastat); | |
259 | sysdev_remove_file(&node->sysdev, &attr_distance); | |
260 | ||
af936a16 | 261 | scan_unevictable_unregister_node(node); |
4faf8d95 | 262 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
af936a16 | 263 | |
4b45099b KT |
264 | sysdev_unregister(&node->sysdev); |
265 | } | |
1da177e4 | 266 | |
0fc44159 YG |
267 | struct node node_devices[MAX_NUMNODES]; |
268 | ||
76b67ed9 KH |
269 | /* |
270 | * register cpu under node | |
271 | */ | |
272 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
273 | { | |
274 | if (node_online(nid)) { | |
275 | struct sys_device *obj = get_cpu_sysdev(cpu); | |
276 | if (!obj) | |
277 | return 0; | |
278 | return sysfs_create_link(&node_devices[nid].sysdev.kobj, | |
279 | &obj->kobj, | |
280 | kobject_name(&obj->kobj)); | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) | |
287 | { | |
288 | if (node_online(nid)) { | |
289 | struct sys_device *obj = get_cpu_sysdev(cpu); | |
290 | if (obj) | |
291 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
292 | kobject_name(&obj->kobj)); | |
293 | } | |
294 | return 0; | |
295 | } | |
296 | ||
c04fc586 GH |
297 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
298 | #define page_initialized(page) (page->lru.next) | |
299 | ||
300 | static int get_nid_for_pfn(unsigned long pfn) | |
301 | { | |
302 | struct page *page; | |
303 | ||
304 | if (!pfn_valid_within(pfn)) | |
305 | return -1; | |
306 | page = pfn_to_page(pfn); | |
307 | if (!page_initialized(page)) | |
308 | return -1; | |
309 | return pfn_to_nid(pfn); | |
310 | } | |
311 | ||
312 | /* register memory section under specified node if it spans that node */ | |
313 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) | |
314 | { | |
315 | unsigned long pfn, sect_start_pfn, sect_end_pfn; | |
316 | ||
317 | if (!mem_blk) | |
318 | return -EFAULT; | |
319 | if (!node_online(nid)) | |
320 | return 0; | |
321 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); | |
322 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
323 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
324 | int page_nid; | |
325 | ||
326 | page_nid = get_nid_for_pfn(pfn); | |
327 | if (page_nid < 0) | |
328 | continue; | |
329 | if (page_nid != nid) | |
330 | continue; | |
331 | return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, | |
332 | &mem_blk->sysdev.kobj, | |
333 | kobject_name(&mem_blk->sysdev.kobj)); | |
334 | } | |
335 | /* mem section does not span the specified node */ | |
336 | return 0; | |
337 | } | |
338 | ||
339 | /* unregister memory section under all nodes that it spans */ | |
340 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) | |
341 | { | |
342 | nodemask_t unlinked_nodes; | |
343 | unsigned long pfn, sect_start_pfn, sect_end_pfn; | |
344 | ||
345 | if (!mem_blk) | |
346 | return -EFAULT; | |
347 | nodes_clear(unlinked_nodes); | |
348 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); | |
349 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
350 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
47504980 | 351 | int nid; |
c04fc586 GH |
352 | |
353 | nid = get_nid_for_pfn(pfn); | |
354 | if (nid < 0) | |
355 | continue; | |
356 | if (!node_online(nid)) | |
357 | continue; | |
358 | if (node_test_and_set(nid, unlinked_nodes)) | |
359 | continue; | |
360 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
361 | kobject_name(&mem_blk->sysdev.kobj)); | |
362 | } | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int link_mem_sections(int nid) | |
367 | { | |
368 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; | |
369 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; | |
370 | unsigned long pfn; | |
371 | int err = 0; | |
372 | ||
373 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
374 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
375 | struct mem_section *mem_sect; | |
376 | struct memory_block *mem_blk; | |
377 | int ret; | |
378 | ||
379 | if (!present_section_nr(section_nr)) | |
380 | continue; | |
381 | mem_sect = __nr_to_section(section_nr); | |
382 | mem_blk = find_memory_block(mem_sect); | |
383 | ret = register_mem_sect_under_node(mem_blk, nid); | |
384 | if (!err) | |
385 | err = ret; | |
386 | ||
387 | /* discard ref obtained in find_memory_block() */ | |
388 | kobject_put(&mem_blk->sysdev.kobj); | |
389 | } | |
390 | return err; | |
391 | } | |
4faf8d95 | 392 | |
39da08cb | 393 | #ifdef CONFIG_HUGETLBFS |
4faf8d95 LS |
394 | /* |
395 | * Handle per node hstate attribute [un]registration on transistions | |
396 | * to/from memoryless state. | |
397 | */ | |
39da08cb LS |
398 | static void node_hugetlb_work(struct work_struct *work) |
399 | { | |
400 | struct node *node = container_of(work, struct node, node_work); | |
401 | ||
402 | /* | |
403 | * We only get here when a node transitions to/from memoryless state. | |
404 | * We can detect which transition occurred by examining whether the | |
405 | * node has memory now. hugetlb_register_node() already check this | |
406 | * so we try to register the attributes. If that fails, then the | |
407 | * node has transitioned to memoryless, try to unregister the | |
408 | * attributes. | |
409 | */ | |
410 | if (!hugetlb_register_node(node)) | |
411 | hugetlb_unregister_node(node); | |
412 | } | |
413 | ||
414 | static void init_node_hugetlb_work(int nid) | |
415 | { | |
416 | INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); | |
417 | } | |
4faf8d95 LS |
418 | |
419 | static int node_memory_callback(struct notifier_block *self, | |
420 | unsigned long action, void *arg) | |
421 | { | |
422 | struct memory_notify *mnb = arg; | |
423 | int nid = mnb->status_change_nid; | |
424 | ||
425 | switch (action) { | |
39da08cb LS |
426 | case MEM_ONLINE: |
427 | case MEM_OFFLINE: | |
428 | /* | |
429 | * offload per node hstate [un]registration to a work thread | |
430 | * when transitioning to/from memoryless state. | |
431 | */ | |
4faf8d95 | 432 | if (nid != NUMA_NO_NODE) |
39da08cb | 433 | schedule_work(&node_devices[nid].node_work); |
4faf8d95 | 434 | break; |
39da08cb | 435 | |
4faf8d95 LS |
436 | case MEM_GOING_ONLINE: |
437 | case MEM_GOING_OFFLINE: | |
438 | case MEM_CANCEL_ONLINE: | |
439 | case MEM_CANCEL_OFFLINE: | |
440 | default: | |
441 | break; | |
442 | } | |
443 | ||
444 | return NOTIFY_OK; | |
445 | } | |
39da08cb LS |
446 | #endif /* CONFIG_HUGETLBFS */ |
447 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ | |
448 | ||
c04fc586 | 449 | static int link_mem_sections(int nid) { return 0; } |
39da08cb | 450 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d95 | 451 | |
39da08cb LS |
452 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
453 | !defined(CONFIG_HUGETLBFS) | |
4faf8d95 LS |
454 | static inline int node_memory_callback(struct notifier_block *self, |
455 | unsigned long action, void *arg) | |
456 | { | |
457 | return NOTIFY_OK; | |
458 | } | |
39da08cb LS |
459 | |
460 | static void init_node_hugetlb_work(int nid) { } | |
461 | ||
462 | #endif | |
c04fc586 | 463 | |
0fc44159 YG |
464 | int register_one_node(int nid) |
465 | { | |
466 | int error = 0; | |
76b67ed9 | 467 | int cpu; |
0fc44159 YG |
468 | |
469 | if (node_online(nid)) { | |
470 | int p_node = parent_node(nid); | |
471 | struct node *parent = NULL; | |
472 | ||
473 | if (p_node != nid) | |
474 | parent = &node_devices[p_node]; | |
475 | ||
476 | error = register_node(&node_devices[nid], nid, parent); | |
76b67ed9 KH |
477 | |
478 | /* link cpu under this node */ | |
479 | for_each_present_cpu(cpu) { | |
480 | if (cpu_to_node(cpu) == nid) | |
481 | register_cpu_under_node(cpu, nid); | |
482 | } | |
c04fc586 GH |
483 | |
484 | /* link memory sections under this node */ | |
485 | error = link_mem_sections(nid); | |
39da08cb LS |
486 | |
487 | /* initialize work queue for memory hot plug */ | |
488 | init_node_hugetlb_work(nid); | |
0fc44159 YG |
489 | } |
490 | ||
491 | return error; | |
492 | ||
493 | } | |
494 | ||
495 | void unregister_one_node(int nid) | |
496 | { | |
497 | unregister_node(&node_devices[nid]); | |
498 | } | |
499 | ||
bde631a5 LS |
500 | /* |
501 | * node states attributes | |
502 | */ | |
503 | ||
504 | static ssize_t print_nodes_state(enum node_states state, char *buf) | |
505 | { | |
506 | int n; | |
507 | ||
508 | n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); | |
509 | if (n > 0 && PAGE_SIZE > n + 1) { | |
510 | *(buf + n++) = '\n'; | |
511 | *(buf + n++) = '\0'; | |
512 | } | |
513 | return n; | |
514 | } | |
515 | ||
516 | static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf) | |
517 | { | |
518 | return print_nodes_state(N_POSSIBLE, buf); | |
519 | } | |
520 | ||
521 | static ssize_t print_nodes_online(struct sysdev_class *class, char *buf) | |
522 | { | |
523 | return print_nodes_state(N_ONLINE, buf); | |
524 | } | |
525 | ||
526 | static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class, | |
527 | char *buf) | |
528 | { | |
529 | return print_nodes_state(N_NORMAL_MEMORY, buf); | |
530 | } | |
531 | ||
532 | static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf) | |
533 | { | |
534 | return print_nodes_state(N_CPU, buf); | |
535 | } | |
536 | ||
537 | static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL); | |
538 | static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL); | |
539 | static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory, | |
540 | NULL); | |
541 | static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL); | |
542 | ||
543 | #ifdef CONFIG_HIGHMEM | |
544 | static ssize_t print_nodes_has_high_memory(struct sysdev_class *class, | |
545 | char *buf) | |
546 | { | |
547 | return print_nodes_state(N_HIGH_MEMORY, buf); | |
548 | } | |
549 | ||
550 | static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory, | |
551 | NULL); | |
552 | #endif | |
553 | ||
554 | struct sysdev_class_attribute *node_state_attr[] = { | |
555 | &attr_possible, | |
556 | &attr_online, | |
557 | &attr_has_normal_memory, | |
558 | #ifdef CONFIG_HIGHMEM | |
559 | &attr_has_high_memory, | |
560 | #endif | |
561 | &attr_has_cpu, | |
562 | }; | |
563 | ||
564 | static int node_states_init(void) | |
565 | { | |
566 | int i; | |
567 | int err = 0; | |
568 | ||
569 | for (i = 0; i < NR_NODE_STATES; i++) { | |
570 | int ret; | |
571 | ret = sysdev_class_create_file(&node_class, node_state_attr[i]); | |
572 | if (!err) | |
573 | err = ret; | |
574 | } | |
575 | return err; | |
576 | } | |
577 | ||
4faf8d95 | 578 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b | 579 | static int __init register_node_type(void) |
1da177e4 | 580 | { |
bde631a5 LS |
581 | int ret; |
582 | ||
583 | ret = sysdev_class_register(&node_class); | |
4faf8d95 | 584 | if (!ret) { |
bde631a5 | 585 | ret = node_states_init(); |
4faf8d95 LS |
586 | hotplug_memory_notifier(node_memory_callback, |
587 | NODE_CALLBACK_PRI); | |
588 | } | |
bde631a5 LS |
589 | |
590 | /* | |
591 | * Note: we're not going to unregister the node class if we fail | |
592 | * to register the node state class attribute files. | |
593 | */ | |
594 | return ret; | |
1da177e4 LT |
595 | } |
596 | postcore_initcall(register_node_type); |