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1 | /* |
2 | * Basic Node interface support |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/init.h> |
7 | #include <linux/mm.h> |
8 | #include <linux/memory.h> |
9 | #include <linux/vmstat.h> |
10 | #include <linux/node.h> |
11 | #include <linux/hugetlb.h> |
12 | #include <linux/compaction.h> |
13 | #include <linux/cpumask.h> |
14 | #include <linux/topology.h> |
15 | #include <linux/nodemask.h> |
16 | #include <linux/cpu.h> |
17 | #include <linux/device.h> |
18 | #include <linux/swap.h> |
19 | #include <linux/slab.h> |
20 | |
21 | static struct bus_type node_subsys = { |
22 | .name = "node", |
23 | .dev_name = "node", |
24 | }; |
25 | |
26 | |
27 | static ssize_t node_read_cpumap(struct device *dev, int type, char *buf) |
28 | { |
29 | struct node *node_dev = to_node(dev); |
30 | const struct cpumask *mask = cpumask_of_node(node_dev->dev.id); |
31 | int len; |
32 | |
33 | /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ |
34 | BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); |
35 | |
36 | len = type? |
37 | cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : |
38 | cpumask_scnprintf(buf, PAGE_SIZE-2, mask); |
39 | buf[len++] = '\n'; |
40 | buf[len] = '\0'; |
41 | return len; |
42 | } |
43 | |
44 | static inline ssize_t node_read_cpumask(struct device *dev, |
45 | struct device_attribute *attr, char *buf) |
46 | { |
47 | return node_read_cpumap(dev, 0, buf); |
48 | } |
49 | static inline ssize_t node_read_cpulist(struct device *dev, |
50 | struct device_attribute *attr, char *buf) |
51 | { |
52 | return node_read_cpumap(dev, 1, buf); |
53 | } |
54 | |
55 | static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); |
56 | static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); |
57 | |
58 | #define K(x) ((x) << (PAGE_SHIFT - 10)) |
59 | static ssize_t node_read_meminfo(struct device *dev, |
60 | struct device_attribute *attr, char *buf) |
61 | { |
62 | int n; |
63 | int nid = dev->id; |
64 | struct sysinfo i; |
65 | |
66 | si_meminfo_node(&i, nid); |
67 | n = sprintf(buf, |
68 | "Node %d MemTotal: %8lu kB\n" |
69 | "Node %d MemFree: %8lu kB\n" |
70 | "Node %d MemUsed: %8lu kB\n" |
71 | "Node %d Active: %8lu kB\n" |
72 | "Node %d Inactive: %8lu kB\n" |
73 | "Node %d Active(anon): %8lu kB\n" |
74 | "Node %d Inactive(anon): %8lu kB\n" |
75 | "Node %d Active(file): %8lu kB\n" |
76 | "Node %d Inactive(file): %8lu kB\n" |
77 | "Node %d Unevictable: %8lu kB\n" |
78 | "Node %d Mlocked: %8lu kB\n", |
79 | nid, K(i.totalram), |
80 | nid, K(i.freeram), |
81 | nid, K(i.totalram - i.freeram), |
82 | nid, K(node_page_state(nid, NR_ACTIVE_ANON) + |
83 | node_page_state(nid, NR_ACTIVE_FILE)), |
84 | nid, K(node_page_state(nid, NR_INACTIVE_ANON) + |
85 | node_page_state(nid, NR_INACTIVE_FILE)), |
86 | nid, K(node_page_state(nid, NR_ACTIVE_ANON)), |
87 | nid, K(node_page_state(nid, NR_INACTIVE_ANON)), |
88 | nid, K(node_page_state(nid, NR_ACTIVE_FILE)), |
89 | nid, K(node_page_state(nid, NR_INACTIVE_FILE)), |
90 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), |
91 | nid, K(node_page_state(nid, NR_MLOCK))); |
92 | |
93 | #ifdef CONFIG_HIGHMEM |
94 | n += sprintf(buf + n, |
95 | "Node %d HighTotal: %8lu kB\n" |
96 | "Node %d HighFree: %8lu kB\n" |
97 | "Node %d LowTotal: %8lu kB\n" |
98 | "Node %d LowFree: %8lu kB\n", |
99 | nid, K(i.totalhigh), |
100 | nid, K(i.freehigh), |
101 | nid, K(i.totalram - i.totalhigh), |
102 | nid, K(i.freeram - i.freehigh)); |
103 | #endif |
104 | n += sprintf(buf + n, |
105 | "Node %d Dirty: %8lu kB\n" |
106 | "Node %d Writeback: %8lu kB\n" |
107 | "Node %d FilePages: %8lu kB\n" |
108 | "Node %d Mapped: %8lu kB\n" |
109 | "Node %d AnonPages: %8lu kB\n" |
110 | "Node %d Shmem: %8lu kB\n" |
111 | "Node %d KernelStack: %8lu kB\n" |
112 | "Node %d PageTables: %8lu kB\n" |
113 | "Node %d NFS_Unstable: %8lu kB\n" |
114 | "Node %d Bounce: %8lu kB\n" |
115 | "Node %d WritebackTmp: %8lu kB\n" |
116 | "Node %d Slab: %8lu kB\n" |
117 | "Node %d SReclaimable: %8lu kB\n" |
118 | "Node %d SUnreclaim: %8lu kB\n" |
119 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
120 | "Node %d AnonHugePages: %8lu kB\n" |
121 | #endif |
122 | , |
123 | nid, K(node_page_state(nid, NR_FILE_DIRTY)), |
124 | nid, K(node_page_state(nid, NR_WRITEBACK)), |
125 | nid, K(node_page_state(nid, NR_FILE_PAGES)), |
126 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
127 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
128 | nid, K(node_page_state(nid, NR_ANON_PAGES) |
129 | + node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * |
130 | HPAGE_PMD_NR), |
131 | #else |
132 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
133 | #endif |
134 | nid, K(node_page_state(nid, NR_SHMEM)), |
135 | nid, node_page_state(nid, NR_KERNEL_STACK) * |
136 | THREAD_SIZE / 1024, |
137 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
138 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
139 | nid, K(node_page_state(nid, NR_BOUNCE)), |
140 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
141 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + |
142 | node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), |
143 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), |
144 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
145 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)) |
146 | , nid, |
147 | K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * |
148 | HPAGE_PMD_NR)); |
149 | #else |
150 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); |
151 | #endif |
152 | n += hugetlb_report_node_meminfo(nid, buf + n); |
153 | return n; |
154 | } |
155 | |
156 | #undef K |
157 | static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); |
158 | |
159 | static ssize_t node_read_numastat(struct device *dev, |
160 | struct device_attribute *attr, char *buf) |
161 | { |
162 | return sprintf(buf, |
163 | "numa_hit %lu\n" |
164 | "numa_miss %lu\n" |
165 | "numa_foreign %lu\n" |
166 | "interleave_hit %lu\n" |
167 | "local_node %lu\n" |
168 | "other_node %lu\n", |
169 | node_page_state(dev->id, NUMA_HIT), |
170 | node_page_state(dev->id, NUMA_MISS), |
171 | node_page_state(dev->id, NUMA_FOREIGN), |
172 | node_page_state(dev->id, NUMA_INTERLEAVE_HIT), |
173 | node_page_state(dev->id, NUMA_LOCAL), |
174 | node_page_state(dev->id, NUMA_OTHER)); |
175 | } |
176 | static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); |
177 | |
178 | static ssize_t node_read_vmstat(struct device *dev, |
179 | struct device_attribute *attr, char *buf) |
180 | { |
181 | int nid = dev->id; |
182 | int i; |
183 | int n = 0; |
184 | |
185 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
186 | n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], |
187 | node_page_state(nid, i)); |
188 | |
189 | return n; |
190 | } |
191 | static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); |
192 | |
193 | static ssize_t node_read_distance(struct device *dev, |
194 | struct device_attribute *attr, char * buf) |
195 | { |
196 | int nid = dev->id; |
197 | int len = 0; |
198 | int i; |
199 | |
200 | /* |
201 | * buf is currently PAGE_SIZE in length and each node needs 4 chars |
202 | * at the most (distance + space or newline). |
203 | */ |
204 | BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); |
205 | |
206 | for_each_online_node(i) |
207 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); |
208 | |
209 | len += sprintf(buf + len, "\n"); |
210 | return len; |
211 | } |
212 | static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); |
213 | |
214 | #ifdef CONFIG_HUGETLBFS |
215 | /* |
216 | * hugetlbfs per node attributes registration interface: |
217 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], |
218 | * it will register its per node attributes for all online nodes with |
219 | * memory. It will also call register_hugetlbfs_with_node(), below, to |
220 | * register its attribute registration functions with this node driver. |
221 | * Once these hooks have been initialized, the node driver will call into |
222 | * the hugetlb module to [un]register attributes for hot-plugged nodes. |
223 | */ |
224 | static node_registration_func_t __hugetlb_register_node; |
225 | static node_registration_func_t __hugetlb_unregister_node; |
226 | |
227 | static inline bool hugetlb_register_node(struct node *node) |
228 | { |
229 | if (__hugetlb_register_node && |
230 | node_state(node->dev.id, N_MEMORY)) { |
231 | __hugetlb_register_node(node); |
232 | return true; |
233 | } |
234 | return false; |
235 | } |
236 | |
237 | static inline void hugetlb_unregister_node(struct node *node) |
238 | { |
239 | if (__hugetlb_unregister_node) |
240 | __hugetlb_unregister_node(node); |
241 | } |
242 | |
243 | void register_hugetlbfs_with_node(node_registration_func_t doregister, |
244 | node_registration_func_t unregister) |
245 | { |
246 | __hugetlb_register_node = doregister; |
247 | __hugetlb_unregister_node = unregister; |
248 | } |
249 | #else |
250 | static inline void hugetlb_register_node(struct node *node) {} |
251 | |
252 | static inline void hugetlb_unregister_node(struct node *node) {} |
253 | #endif |
254 | |
255 | static void node_device_release(struct device *dev) |
256 | { |
257 | struct node *node = to_node(dev); |
258 | |
259 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) |
260 | /* |
261 | * We schedule the work only when a memory section is |
262 | * onlined/offlined on this node. When we come here, |
263 | * all the memory on this node has been offlined, |
264 | * so we won't enqueue new work to this work. |
265 | * |
266 | * The work is using node->node_work, so we should |
267 | * flush work before freeing the memory. |
268 | */ |
269 | flush_work(&node->node_work); |
270 | #endif |
271 | kfree(node); |
272 | } |
273 | |
274 | /* |
275 | * register_node - Setup a sysfs device for a node. |
276 | * @num - Node number to use when creating the device. |
277 | * |
278 | * Initialize and register the node device. |
279 | */ |
280 | static int register_node(struct node *node, int num, struct node *parent) |
281 | { |
282 | int error; |
283 | |
284 | node->dev.id = num; |
285 | node->dev.bus = &node_subsys; |
286 | node->dev.release = node_device_release; |
287 | error = device_register(&node->dev); |
288 | |
289 | if (!error){ |
290 | device_create_file(&node->dev, &dev_attr_cpumap); |
291 | device_create_file(&node->dev, &dev_attr_cpulist); |
292 | device_create_file(&node->dev, &dev_attr_meminfo); |
293 | device_create_file(&node->dev, &dev_attr_numastat); |
294 | device_create_file(&node->dev, &dev_attr_distance); |
295 | device_create_file(&node->dev, &dev_attr_vmstat); |
296 | |
297 | scan_unevictable_register_node(node); |
298 | |
299 | hugetlb_register_node(node); |
300 | |
301 | compaction_register_node(node); |
302 | } |
303 | return error; |
304 | } |
305 | |
306 | /** |
307 | * unregister_node - unregister a node device |
308 | * @node: node going away |
309 | * |
310 | * Unregisters a node device @node. All the devices on the node must be |
311 | * unregistered before calling this function. |
312 | */ |
313 | void unregister_node(struct node *node) |
314 | { |
315 | device_remove_file(&node->dev, &dev_attr_cpumap); |
316 | device_remove_file(&node->dev, &dev_attr_cpulist); |
317 | device_remove_file(&node->dev, &dev_attr_meminfo); |
318 | device_remove_file(&node->dev, &dev_attr_numastat); |
319 | device_remove_file(&node->dev, &dev_attr_distance); |
320 | device_remove_file(&node->dev, &dev_attr_vmstat); |
321 | |
322 | scan_unevictable_unregister_node(node); |
323 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
324 | |
325 | device_unregister(&node->dev); |
326 | } |
327 | |
328 | struct node *node_devices[MAX_NUMNODES]; |
329 | |
330 | /* |
331 | * register cpu under node |
332 | */ |
333 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) |
334 | { |
335 | int ret; |
336 | struct device *obj; |
337 | |
338 | if (!node_online(nid)) |
339 | return 0; |
340 | |
341 | obj = get_cpu_device(cpu); |
342 | if (!obj) |
343 | return 0; |
344 | |
345 | ret = sysfs_create_link(&node_devices[nid]->dev.kobj, |
346 | &obj->kobj, |
347 | kobject_name(&obj->kobj)); |
348 | if (ret) |
349 | return ret; |
350 | |
351 | return sysfs_create_link(&obj->kobj, |
352 | &node_devices[nid]->dev.kobj, |
353 | kobject_name(&node_devices[nid]->dev.kobj)); |
354 | } |
355 | |
356 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) |
357 | { |
358 | struct device *obj; |
359 | |
360 | if (!node_online(nid)) |
361 | return 0; |
362 | |
363 | obj = get_cpu_device(cpu); |
364 | if (!obj) |
365 | return 0; |
366 | |
367 | sysfs_remove_link(&node_devices[nid]->dev.kobj, |
368 | kobject_name(&obj->kobj)); |
369 | sysfs_remove_link(&obj->kobj, |
370 | kobject_name(&node_devices[nid]->dev.kobj)); |
371 | |
372 | return 0; |
373 | } |
374 | |
375 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
376 | #define page_initialized(page) (page->lru.next) |
377 | |
378 | static int get_nid_for_pfn(unsigned long pfn) |
379 | { |
380 | struct page *page; |
381 | |
382 | if (!pfn_valid_within(pfn)) |
383 | return -1; |
384 | page = pfn_to_page(pfn); |
385 | if (!page_initialized(page)) |
386 | return -1; |
387 | return pfn_to_nid(pfn); |
388 | } |
389 | |
390 | /* register memory section under specified node if it spans that node */ |
391 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) |
392 | { |
393 | int ret; |
394 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
395 | |
396 | if (!mem_blk) |
397 | return -EFAULT; |
398 | if (!node_online(nid)) |
399 | return 0; |
400 | |
401 | sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); |
402 | sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); |
403 | sect_end_pfn += PAGES_PER_SECTION - 1; |
404 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { |
405 | int page_nid; |
406 | |
407 | page_nid = get_nid_for_pfn(pfn); |
408 | if (page_nid < 0) |
409 | continue; |
410 | if (page_nid != nid) |
411 | continue; |
412 | ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, |
413 | &mem_blk->dev.kobj, |
414 | kobject_name(&mem_blk->dev.kobj)); |
415 | if (ret) |
416 | return ret; |
417 | |
418 | return sysfs_create_link_nowarn(&mem_blk->dev.kobj, |
419 | &node_devices[nid]->dev.kobj, |
420 | kobject_name(&node_devices[nid]->dev.kobj)); |
421 | } |
422 | /* mem section does not span the specified node */ |
423 | return 0; |
424 | } |
425 | |
426 | /* unregister memory section under all nodes that it spans */ |
427 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, |
428 | unsigned long phys_index) |
429 | { |
430 | NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); |
431 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
432 | |
433 | if (!mem_blk) { |
434 | NODEMASK_FREE(unlinked_nodes); |
435 | return -EFAULT; |
436 | } |
437 | if (!unlinked_nodes) |
438 | return -ENOMEM; |
439 | nodes_clear(*unlinked_nodes); |
440 | |
441 | sect_start_pfn = section_nr_to_pfn(phys_index); |
442 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; |
443 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { |
444 | int nid; |
445 | |
446 | nid = get_nid_for_pfn(pfn); |
447 | if (nid < 0) |
448 | continue; |
449 | if (!node_online(nid)) |
450 | continue; |
451 | if (node_test_and_set(nid, *unlinked_nodes)) |
452 | continue; |
453 | sysfs_remove_link(&node_devices[nid]->dev.kobj, |
454 | kobject_name(&mem_blk->dev.kobj)); |
455 | sysfs_remove_link(&mem_blk->dev.kobj, |
456 | kobject_name(&node_devices[nid]->dev.kobj)); |
457 | } |
458 | NODEMASK_FREE(unlinked_nodes); |
459 | return 0; |
460 | } |
461 | |
462 | static int link_mem_sections(int nid) |
463 | { |
464 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; |
465 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; |
466 | unsigned long pfn; |
467 | struct memory_block *mem_blk = NULL; |
468 | int err = 0; |
469 | |
470 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
471 | unsigned long section_nr = pfn_to_section_nr(pfn); |
472 | struct mem_section *mem_sect; |
473 | int ret; |
474 | |
475 | if (!present_section_nr(section_nr)) |
476 | continue; |
477 | mem_sect = __nr_to_section(section_nr); |
478 | |
479 | /* same memblock ? */ |
480 | if (mem_blk) |
481 | if ((section_nr >= mem_blk->start_section_nr) && |
482 | (section_nr <= mem_blk->end_section_nr)) |
483 | continue; |
484 | |
485 | mem_blk = find_memory_block_hinted(mem_sect, mem_blk); |
486 | |
487 | ret = register_mem_sect_under_node(mem_blk, nid); |
488 | if (!err) |
489 | err = ret; |
490 | |
491 | /* discard ref obtained in find_memory_block() */ |
492 | } |
493 | |
494 | if (mem_blk) |
495 | kobject_put(&mem_blk->dev.kobj); |
496 | return err; |
497 | } |
498 | |
499 | #ifdef CONFIG_HUGETLBFS |
500 | /* |
501 | * Handle per node hstate attribute [un]registration on transistions |
502 | * to/from memoryless state. |
503 | */ |
504 | static void node_hugetlb_work(struct work_struct *work) |
505 | { |
506 | struct node *node = container_of(work, struct node, node_work); |
507 | |
508 | /* |
509 | * We only get here when a node transitions to/from memoryless state. |
510 | * We can detect which transition occurred by examining whether the |
511 | * node has memory now. hugetlb_register_node() already check this |
512 | * so we try to register the attributes. If that fails, then the |
513 | * node has transitioned to memoryless, try to unregister the |
514 | * attributes. |
515 | */ |
516 | if (!hugetlb_register_node(node)) |
517 | hugetlb_unregister_node(node); |
518 | } |
519 | |
520 | static void init_node_hugetlb_work(int nid) |
521 | { |
522 | INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work); |
523 | } |
524 | |
525 | static int node_memory_callback(struct notifier_block *self, |
526 | unsigned long action, void *arg) |
527 | { |
528 | struct memory_notify *mnb = arg; |
529 | int nid = mnb->status_change_nid; |
530 | |
531 | switch (action) { |
532 | case MEM_ONLINE: |
533 | case MEM_OFFLINE: |
534 | /* |
535 | * offload per node hstate [un]registration to a work thread |
536 | * when transitioning to/from memoryless state. |
537 | */ |
538 | if (nid != NUMA_NO_NODE) |
539 | schedule_work(&node_devices[nid]->node_work); |
540 | break; |
541 | |
542 | case MEM_GOING_ONLINE: |
543 | case MEM_GOING_OFFLINE: |
544 | case MEM_CANCEL_ONLINE: |
545 | case MEM_CANCEL_OFFLINE: |
546 | default: |
547 | break; |
548 | } |
549 | |
550 | return NOTIFY_OK; |
551 | } |
552 | #endif /* CONFIG_HUGETLBFS */ |
553 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ |
554 | |
555 | static int link_mem_sections(int nid) { return 0; } |
556 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
557 | |
558 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
559 | !defined(CONFIG_HUGETLBFS) |
560 | static inline int node_memory_callback(struct notifier_block *self, |
561 | unsigned long action, void *arg) |
562 | { |
563 | return NOTIFY_OK; |
564 | } |
565 | |
566 | static void init_node_hugetlb_work(int nid) { } |
567 | |
568 | #endif |
569 | |
570 | int register_one_node(int nid) |
571 | { |
572 | int error = 0; |
573 | int cpu; |
574 | |
575 | if (node_online(nid)) { |
576 | int p_node = parent_node(nid); |
577 | struct node *parent = NULL; |
578 | |
579 | if (p_node != nid) |
580 | parent = node_devices[p_node]; |
581 | |
582 | node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); |
583 | if (!node_devices[nid]) |
584 | return -ENOMEM; |
585 | |
586 | error = register_node(node_devices[nid], nid, parent); |
587 | |
588 | /* link cpu under this node */ |
589 | for_each_present_cpu(cpu) { |
590 | if (cpu_to_node(cpu) == nid) |
591 | register_cpu_under_node(cpu, nid); |
592 | } |
593 | |
594 | /* link memory sections under this node */ |
595 | error = link_mem_sections(nid); |
596 | |
597 | /* initialize work queue for memory hot plug */ |
598 | init_node_hugetlb_work(nid); |
599 | } |
600 | |
601 | return error; |
602 | |
603 | } |
604 | |
605 | void unregister_one_node(int nid) |
606 | { |
607 | unregister_node(node_devices[nid]); |
608 | node_devices[nid] = NULL; |
609 | } |
610 | |
611 | /* |
612 | * node states attributes |
613 | */ |
614 | |
615 | static ssize_t print_nodes_state(enum node_states state, char *buf) |
616 | { |
617 | int n; |
618 | |
619 | n = nodelist_scnprintf(buf, PAGE_SIZE-2, node_states[state]); |
620 | buf[n++] = '\n'; |
621 | buf[n] = '\0'; |
622 | return n; |
623 | } |
624 | |
625 | struct node_attr { |
626 | struct device_attribute attr; |
627 | enum node_states state; |
628 | }; |
629 | |
630 | static ssize_t show_node_state(struct device *dev, |
631 | struct device_attribute *attr, char *buf) |
632 | { |
633 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
634 | return print_nodes_state(na->state, buf); |
635 | } |
636 | |
637 | #define _NODE_ATTR(name, state) \ |
638 | { __ATTR(name, 0444, show_node_state, NULL), state } |
639 | |
640 | static struct node_attr node_state_attr[] = { |
641 | [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), |
642 | [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), |
643 | [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), |
644 | #ifdef CONFIG_HIGHMEM |
645 | [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
646 | #endif |
647 | #ifdef CONFIG_MOVABLE_NODE |
648 | [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), |
649 | #endif |
650 | [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), |
651 | }; |
652 | |
653 | static struct attribute *node_state_attrs[] = { |
654 | &node_state_attr[N_POSSIBLE].attr.attr, |
655 | &node_state_attr[N_ONLINE].attr.attr, |
656 | &node_state_attr[N_NORMAL_MEMORY].attr.attr, |
657 | #ifdef CONFIG_HIGHMEM |
658 | &node_state_attr[N_HIGH_MEMORY].attr.attr, |
659 | #endif |
660 | #ifdef CONFIG_MOVABLE_NODE |
661 | &node_state_attr[N_MEMORY].attr.attr, |
662 | #endif |
663 | &node_state_attr[N_CPU].attr.attr, |
664 | NULL |
665 | }; |
666 | |
667 | static struct attribute_group memory_root_attr_group = { |
668 | .attrs = node_state_attrs, |
669 | }; |
670 | |
671 | static const struct attribute_group *cpu_root_attr_groups[] = { |
672 | &memory_root_attr_group, |
673 | NULL, |
674 | }; |
675 | |
676 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
677 | static int __init register_node_type(void) |
678 | { |
679 | int ret; |
680 | |
681 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
682 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); |
683 | |
684 | ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); |
685 | if (!ret) { |
686 | hotplug_memory_notifier(node_memory_callback, |
687 | NODE_CALLBACK_PRI); |
688 | } |
689 | |
690 | /* |
691 | * Note: we're not going to unregister the node class if we fail |
692 | * to register the node state class attribute files. |
693 | */ |
694 | return ret; |
695 | } |
696 | postcore_initcall(register_node_type); |
697 |
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