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