1
2
3
4
5
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/notifier.h>
12#include <linux/node.h>
13#include <linux/hugetlb.h>
14#include <linux/compaction.h>
15#include <linux/cpumask.h>
16#include <linux/topology.h>
17#include <linux/nodemask.h>
18#include <linux/cpu.h>
19#include <linux/device.h>
20#include <linux/pm_runtime.h>
21#include <linux/swap.h>
22#include <linux/slab.h>
23
24static struct bus_type node_subsys = {
25 .name = "node",
26 .dev_name = "node",
27};
28
29
30static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
31{
32 ssize_t n;
33 cpumask_var_t mask;
34 struct node *node_dev = to_node(dev);
35
36
37 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
38
39 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
40 return 0;
41
42 cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
43 n = cpumap_print_to_pagebuf(list, buf, mask);
44 free_cpumask_var(mask);
45
46 return n;
47}
48
49static inline ssize_t node_read_cpumask(struct device *dev,
50 struct device_attribute *attr, char *buf)
51{
52 return node_read_cpumap(dev, false, buf);
53}
54static inline ssize_t node_read_cpulist(struct device *dev,
55 struct device_attribute *attr, char *buf)
56{
57 return node_read_cpumap(dev, true, buf);
58}
59
60static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
61static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
62
63
64
65
66
67
68
69
70
71struct node_access_nodes {
72 struct device dev;
73 struct list_head list_node;
74 unsigned access;
75#ifdef CONFIG_HMEM_REPORTING
76 struct node_hmem_attrs hmem_attrs;
77#endif
78};
79#define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev)
80
81static struct attribute *node_init_access_node_attrs[] = {
82 NULL,
83};
84
85static struct attribute *node_targ_access_node_attrs[] = {
86 NULL,
87};
88
89static const struct attribute_group initiators = {
90 .name = "initiators",
91 .attrs = node_init_access_node_attrs,
92};
93
94static const struct attribute_group targets = {
95 .name = "targets",
96 .attrs = node_targ_access_node_attrs,
97};
98
99static const struct attribute_group *node_access_node_groups[] = {
100 &initiators,
101 &targets,
102 NULL,
103};
104
105static void node_remove_accesses(struct node *node)
106{
107 struct node_access_nodes *c, *cnext;
108
109 list_for_each_entry_safe(c, cnext, &node->access_list, list_node) {
110 list_del(&c->list_node);
111 device_unregister(&c->dev);
112 }
113}
114
115static void node_access_release(struct device *dev)
116{
117 kfree(to_access_nodes(dev));
118}
119
120static struct node_access_nodes *node_init_node_access(struct node *node,
121 unsigned access)
122{
123 struct node_access_nodes *access_node;
124 struct device *dev;
125
126 list_for_each_entry(access_node, &node->access_list, list_node)
127 if (access_node->access == access)
128 return access_node;
129
130 access_node = kzalloc(sizeof(*access_node), GFP_KERNEL);
131 if (!access_node)
132 return NULL;
133
134 access_node->access = access;
135 dev = &access_node->dev;
136 dev->parent = &node->dev;
137 dev->release = node_access_release;
138 dev->groups = node_access_node_groups;
139 if (dev_set_name(dev, "access%u", access))
140 goto free;
141
142 if (device_register(dev))
143 goto free_name;
144
145 pm_runtime_no_callbacks(dev);
146 list_add_tail(&access_node->list_node, &node->access_list);
147 return access_node;
148free_name:
149 kfree_const(dev->kobj.name);
150free:
151 kfree(access_node);
152 return NULL;
153}
154
155#ifdef CONFIG_HMEM_REPORTING
156#define ACCESS_ATTR(name) \
157static ssize_t name##_show(struct device *dev, \
158 struct device_attribute *attr, \
159 char *buf) \
160{ \
161 return sprintf(buf, "%u\n", to_access_nodes(dev)->hmem_attrs.name); \
162} \
163static DEVICE_ATTR_RO(name);
164
165ACCESS_ATTR(read_bandwidth)
166ACCESS_ATTR(read_latency)
167ACCESS_ATTR(write_bandwidth)
168ACCESS_ATTR(write_latency)
169
170static struct attribute *access_attrs[] = {
171 &dev_attr_read_bandwidth.attr,
172 &dev_attr_read_latency.attr,
173 &dev_attr_write_bandwidth.attr,
174 &dev_attr_write_latency.attr,
175 NULL,
176};
177
178
179
180
181
182
183
184void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
185 unsigned access)
186{
187 struct node_access_nodes *c;
188 struct node *node;
189 int i;
190
191 if (WARN_ON_ONCE(!node_online(nid)))
192 return;
193
194 node = node_devices[nid];
195 c = node_init_node_access(node, access);
196 if (!c)
197 return;
198
199 c->hmem_attrs = *hmem_attrs;
200 for (i = 0; access_attrs[i] != NULL; i++) {
201 if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i],
202 "initiators")) {
203 pr_info("failed to add performance attribute to node %d\n",
204 nid);
205 break;
206 }
207 }
208}
209
210
211
212
213
214
215
216struct node_cache_info {
217 struct device dev;
218 struct list_head node;
219 struct node_cache_attrs cache_attrs;
220};
221#define to_cache_info(device) container_of(device, struct node_cache_info, dev)
222
223#define CACHE_ATTR(name, fmt) \
224static ssize_t name##_show(struct device *dev, \
225 struct device_attribute *attr, \
226 char *buf) \
227{ \
228 return sprintf(buf, fmt "\n", to_cache_info(dev)->cache_attrs.name);\
229} \
230DEVICE_ATTR_RO(name);
231
232CACHE_ATTR(size, "%llu")
233CACHE_ATTR(line_size, "%u")
234CACHE_ATTR(indexing, "%u")
235CACHE_ATTR(write_policy, "%u")
236
237static struct attribute *cache_attrs[] = {
238 &dev_attr_indexing.attr,
239 &dev_attr_size.attr,
240 &dev_attr_line_size.attr,
241 &dev_attr_write_policy.attr,
242 NULL,
243};
244ATTRIBUTE_GROUPS(cache);
245
246static void node_cache_release(struct device *dev)
247{
248 kfree(dev);
249}
250
251static void node_cacheinfo_release(struct device *dev)
252{
253 struct node_cache_info *info = to_cache_info(dev);
254 kfree(info);
255}
256
257static void node_init_cache_dev(struct node *node)
258{
259 struct device *dev;
260
261 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
262 if (!dev)
263 return;
264
265 dev->parent = &node->dev;
266 dev->release = node_cache_release;
267 if (dev_set_name(dev, "memory_side_cache"))
268 goto free_dev;
269
270 if (device_register(dev))
271 goto free_name;
272
273 pm_runtime_no_callbacks(dev);
274 node->cache_dev = dev;
275 return;
276free_name:
277 kfree_const(dev->kobj.name);
278free_dev:
279 kfree(dev);
280}
281
282
283
284
285
286
287void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs)
288{
289 struct node_cache_info *info;
290 struct device *dev;
291 struct node *node;
292
293 if (!node_online(nid) || !node_devices[nid])
294 return;
295
296 node = node_devices[nid];
297 list_for_each_entry(info, &node->cache_attrs, node) {
298 if (info->cache_attrs.level == cache_attrs->level) {
299 dev_warn(&node->dev,
300 "attempt to add duplicate cache level:%d\n",
301 cache_attrs->level);
302 return;
303 }
304 }
305
306 if (!node->cache_dev)
307 node_init_cache_dev(node);
308 if (!node->cache_dev)
309 return;
310
311 info = kzalloc(sizeof(*info), GFP_KERNEL);
312 if (!info)
313 return;
314
315 dev = &info->dev;
316 dev->parent = node->cache_dev;
317 dev->release = node_cacheinfo_release;
318 dev->groups = cache_groups;
319 if (dev_set_name(dev, "index%d", cache_attrs->level))
320 goto free_cache;
321
322 info->cache_attrs = *cache_attrs;
323 if (device_register(dev)) {
324 dev_warn(&node->dev, "failed to add cache level:%d\n",
325 cache_attrs->level);
326 goto free_name;
327 }
328 pm_runtime_no_callbacks(dev);
329 list_add_tail(&info->node, &node->cache_attrs);
330 return;
331free_name:
332 kfree_const(dev->kobj.name);
333free_cache:
334 kfree(info);
335}
336
337static void node_remove_caches(struct node *node)
338{
339 struct node_cache_info *info, *next;
340
341 if (!node->cache_dev)
342 return;
343
344 list_for_each_entry_safe(info, next, &node->cache_attrs, node) {
345 list_del(&info->node);
346 device_unregister(&info->dev);
347 }
348 device_unregister(node->cache_dev);
349}
350
351static void node_init_caches(unsigned int nid)
352{
353 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);
354}
355#else
356static void node_init_caches(unsigned int nid) { }
357static void node_remove_caches(struct node *node) { }
358#endif
359
360#define K(x) ((x) << (PAGE_SHIFT - 10))
361static ssize_t node_read_meminfo(struct device *dev,
362 struct device_attribute *attr, char *buf)
363{
364 int n;
365 int nid = dev->id;
366 struct pglist_data *pgdat = NODE_DATA(nid);
367 struct sysinfo i;
368 unsigned long sreclaimable, sunreclaimable;
369
370 si_meminfo_node(&i, nid);
371 sreclaimable = node_page_state(pgdat, NR_SLAB_RECLAIMABLE);
372 sunreclaimable = node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE);
373 n = sprintf(buf,
374 "Node %d MemTotal: %8lu kB\n"
375 "Node %d MemFree: %8lu kB\n"
376 "Node %d MemUsed: %8lu kB\n"
377 "Node %d Active: %8lu kB\n"
378 "Node %d Inactive: %8lu kB\n"
379 "Node %d Active(anon): %8lu kB\n"
380 "Node %d Inactive(anon): %8lu kB\n"
381 "Node %d Active(file): %8lu kB\n"
382 "Node %d Inactive(file): %8lu kB\n"
383 "Node %d Unevictable: %8lu kB\n"
384 "Node %d Mlocked: %8lu kB\n",
385 nid, K(i.totalram),
386 nid, K(i.freeram),
387 nid, K(i.totalram - i.freeram),
388 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) +
389 node_page_state(pgdat, NR_ACTIVE_FILE)),
390 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) +
391 node_page_state(pgdat, NR_INACTIVE_FILE)),
392 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)),
393 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)),
394 nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)),
395 nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)),
396 nid, K(node_page_state(pgdat, NR_UNEVICTABLE)),
397 nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
398
399#ifdef CONFIG_HIGHMEM
400 n += sprintf(buf + n,
401 "Node %d HighTotal: %8lu kB\n"
402 "Node %d HighFree: %8lu kB\n"
403 "Node %d LowTotal: %8lu kB\n"
404 "Node %d LowFree: %8lu kB\n",
405 nid, K(i.totalhigh),
406 nid, K(i.freehigh),
407 nid, K(i.totalram - i.totalhigh),
408 nid, K(i.freeram - i.freehigh));
409#endif
410 n += sprintf(buf + n,
411 "Node %d Dirty: %8lu kB\n"
412 "Node %d Writeback: %8lu kB\n"
413 "Node %d FilePages: %8lu kB\n"
414 "Node %d Mapped: %8lu kB\n"
415 "Node %d AnonPages: %8lu kB\n"
416 "Node %d Shmem: %8lu kB\n"
417 "Node %d KernelStack: %8lu kB\n"
418 "Node %d PageTables: %8lu kB\n"
419 "Node %d NFS_Unstable: %8lu kB\n"
420 "Node %d Bounce: %8lu kB\n"
421 "Node %d WritebackTmp: %8lu kB\n"
422 "Node %d KReclaimable: %8lu kB\n"
423 "Node %d Slab: %8lu kB\n"
424 "Node %d SReclaimable: %8lu kB\n"
425 "Node %d SUnreclaim: %8lu kB\n"
426#ifdef CONFIG_TRANSPARENT_HUGEPAGE
427 "Node %d AnonHugePages: %8lu kB\n"
428 "Node %d ShmemHugePages: %8lu kB\n"
429 "Node %d ShmemPmdMapped: %8lu kB\n"
430#endif
431 ,
432 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
433 nid, K(node_page_state(pgdat, NR_WRITEBACK)),
434 nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
435 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
436 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
437 nid, K(i.sharedram),
438 nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB),
439 nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
440 nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
441 nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
442 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
443 nid, K(sreclaimable +
444 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
445 nid, K(sreclaimable + sunreclaimable),
446 nid, K(sreclaimable),
447 nid, K(sunreclaimable)
448#ifdef CONFIG_TRANSPARENT_HUGEPAGE
449 ,
450 nid, K(node_page_state(pgdat, NR_ANON_THPS) *
451 HPAGE_PMD_NR),
452 nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
453 HPAGE_PMD_NR),
454 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
455 HPAGE_PMD_NR)
456#endif
457 );
458 n += hugetlb_report_node_meminfo(nid, buf + n);
459 return n;
460}
461
462#undef K
463static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
464
465static ssize_t node_read_numastat(struct device *dev,
466 struct device_attribute *attr, char *buf)
467{
468 return sprintf(buf,
469 "numa_hit %lu\n"
470 "numa_miss %lu\n"
471 "numa_foreign %lu\n"
472 "interleave_hit %lu\n"
473 "local_node %lu\n"
474 "other_node %lu\n",
475 sum_zone_numa_state(dev->id, NUMA_HIT),
476 sum_zone_numa_state(dev->id, NUMA_MISS),
477 sum_zone_numa_state(dev->id, NUMA_FOREIGN),
478 sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
479 sum_zone_numa_state(dev->id, NUMA_LOCAL),
480 sum_zone_numa_state(dev->id, NUMA_OTHER));
481}
482static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
483
484static ssize_t node_read_vmstat(struct device *dev,
485 struct device_attribute *attr, char *buf)
486{
487 int nid = dev->id;
488 struct pglist_data *pgdat = NODE_DATA(nid);
489 int i;
490 int n = 0;
491
492 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
493 n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
494 sum_zone_node_page_state(nid, i));
495
496#ifdef CONFIG_NUMA
497 for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
498 n += sprintf(buf+n, "%s %lu\n",
499 vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
500 sum_zone_numa_state(nid, i));
501#endif
502
503 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
504 n += sprintf(buf+n, "%s %lu\n",
505 vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
506 NR_VM_NUMA_STAT_ITEMS],
507 node_page_state(pgdat, i));
508
509 return n;
510}
511static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
512
513static ssize_t node_read_distance(struct device *dev,
514 struct device_attribute *attr, char *buf)
515{
516 int nid = dev->id;
517 int len = 0;
518 int i;
519
520
521
522
523
524 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
525
526 for_each_online_node(i)
527 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
528
529 len += sprintf(buf + len, "\n");
530 return len;
531}
532static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);
533
534static struct attribute *node_dev_attrs[] = {
535 &dev_attr_cpumap.attr,
536 &dev_attr_cpulist.attr,
537 &dev_attr_meminfo.attr,
538 &dev_attr_numastat.attr,
539 &dev_attr_distance.attr,
540 &dev_attr_vmstat.attr,
541 NULL
542};
543ATTRIBUTE_GROUPS(node_dev);
544
545#ifdef CONFIG_HUGETLBFS
546
547
548
549
550
551
552
553
554
555static node_registration_func_t __hugetlb_register_node;
556static node_registration_func_t __hugetlb_unregister_node;
557
558static inline bool hugetlb_register_node(struct node *node)
559{
560 if (__hugetlb_register_node &&
561 node_state(node->dev.id, N_MEMORY)) {
562 __hugetlb_register_node(node);
563 return true;
564 }
565 return false;
566}
567
568static inline void hugetlb_unregister_node(struct node *node)
569{
570 if (__hugetlb_unregister_node)
571 __hugetlb_unregister_node(node);
572}
573
574void register_hugetlbfs_with_node(node_registration_func_t doregister,
575 node_registration_func_t unregister)
576{
577 __hugetlb_register_node = doregister;
578 __hugetlb_unregister_node = unregister;
579}
580#else
581static inline void hugetlb_register_node(struct node *node) {}
582
583static inline void hugetlb_unregister_node(struct node *node) {}
584#endif
585
586static void node_device_release(struct device *dev)
587{
588 struct node *node = to_node(dev);
589
590#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
591
592
593
594
595
596
597
598
599
600 flush_work(&node->node_work);
601#endif
602 kfree(node);
603}
604
605
606
607
608
609
610
611static int register_node(struct node *node, int num)
612{
613 int error;
614
615 node->dev.id = num;
616 node->dev.bus = &node_subsys;
617 node->dev.release = node_device_release;
618 node->dev.groups = node_dev_groups;
619 error = device_register(&node->dev);
620
621 if (error)
622 put_device(&node->dev);
623 else {
624 hugetlb_register_node(node);
625
626 compaction_register_node(node);
627 }
628 return error;
629}
630
631
632
633
634
635
636
637
638void unregister_node(struct node *node)
639{
640 hugetlb_unregister_node(node);
641 node_remove_accesses(node);
642 node_remove_caches(node);
643 device_unregister(&node->dev);
644}
645
646struct node *node_devices[MAX_NUMNODES];
647
648
649
650
651int register_cpu_under_node(unsigned int cpu, unsigned int nid)
652{
653 int ret;
654 struct device *obj;
655
656 if (!node_online(nid))
657 return 0;
658
659 obj = get_cpu_device(cpu);
660 if (!obj)
661 return 0;
662
663 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
664 &obj->kobj,
665 kobject_name(&obj->kobj));
666 if (ret)
667 return ret;
668
669 return sysfs_create_link(&obj->kobj,
670 &node_devices[nid]->dev.kobj,
671 kobject_name(&node_devices[nid]->dev.kobj));
672}
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687int register_memory_node_under_compute_node(unsigned int mem_nid,
688 unsigned int cpu_nid,
689 unsigned access)
690{
691 struct node *init_node, *targ_node;
692 struct node_access_nodes *initiator, *target;
693 int ret;
694
695 if (!node_online(cpu_nid) || !node_online(mem_nid))
696 return -ENODEV;
697
698 init_node = node_devices[cpu_nid];
699 targ_node = node_devices[mem_nid];
700 initiator = node_init_node_access(init_node, access);
701 target = node_init_node_access(targ_node, access);
702 if (!initiator || !target)
703 return -ENOMEM;
704
705 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets",
706 &targ_node->dev.kobj,
707 dev_name(&targ_node->dev));
708 if (ret)
709 return ret;
710
711 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators",
712 &init_node->dev.kobj,
713 dev_name(&init_node->dev));
714 if (ret)
715 goto err;
716
717 return 0;
718 err:
719 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets",
720 dev_name(&targ_node->dev));
721 return ret;
722}
723
724int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
725{
726 struct device *obj;
727
728 if (!node_online(nid))
729 return 0;
730
731 obj = get_cpu_device(cpu);
732 if (!obj)
733 return 0;
734
735 sysfs_remove_link(&node_devices[nid]->dev.kobj,
736 kobject_name(&obj->kobj));
737 sysfs_remove_link(&obj->kobj,
738 kobject_name(&node_devices[nid]->dev.kobj));
739
740 return 0;
741}
742
743#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
744static int __ref get_nid_for_pfn(unsigned long pfn)
745{
746 if (!pfn_valid_within(pfn))
747 return -1;
748#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
749 if (system_state < SYSTEM_RUNNING)
750 return early_pfn_to_nid(pfn);
751#endif
752 return pfn_to_nid(pfn);
753}
754
755
756static int register_mem_sect_under_node(struct memory_block *mem_blk,
757 void *arg)
758{
759 int ret, nid = *(int *)arg;
760 unsigned long pfn, sect_start_pfn, sect_end_pfn;
761
762 mem_blk->nid = nid;
763
764 sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
765 sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
766 sect_end_pfn += PAGES_PER_SECTION - 1;
767 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
768 int page_nid;
769
770
771
772
773
774 if (!pfn_present(pfn)) {
775 pfn = round_down(pfn + PAGES_PER_SECTION,
776 PAGES_PER_SECTION) - 1;
777 continue;
778 }
779
780
781
782
783
784
785 if (system_state == SYSTEM_BOOTING) {
786 page_nid = get_nid_for_pfn(pfn);
787 if (page_nid < 0)
788 continue;
789 if (page_nid != nid)
790 continue;
791 }
792 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
793 &mem_blk->dev.kobj,
794 kobject_name(&mem_blk->dev.kobj));
795 if (ret)
796 return ret;
797
798 return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
799 &node_devices[nid]->dev.kobj,
800 kobject_name(&node_devices[nid]->dev.kobj));
801 }
802
803 return 0;
804}
805
806
807
808
809
810void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
811{
812 unsigned long pfn, sect_start_pfn, sect_end_pfn;
813 static nodemask_t unlinked_nodes;
814
815 nodes_clear(unlinked_nodes);
816 sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
817 sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
818 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
819 int nid;
820
821 nid = get_nid_for_pfn(pfn);
822 if (nid < 0)
823 continue;
824 if (!node_online(nid))
825 continue;
826 if (node_test_and_set(nid, unlinked_nodes))
827 continue;
828 sysfs_remove_link(&node_devices[nid]->dev.kobj,
829 kobject_name(&mem_blk->dev.kobj));
830 sysfs_remove_link(&mem_blk->dev.kobj,
831 kobject_name(&node_devices[nid]->dev.kobj));
832 }
833}
834
835int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn)
836{
837 return walk_memory_blocks(PFN_PHYS(start_pfn),
838 PFN_PHYS(end_pfn - start_pfn), (void *)&nid,
839 register_mem_sect_under_node);
840}
841
842#ifdef CONFIG_HUGETLBFS
843
844
845
846
847static void node_hugetlb_work(struct work_struct *work)
848{
849 struct node *node = container_of(work, struct node, node_work);
850
851
852
853
854
855
856
857
858
859 if (!hugetlb_register_node(node))
860 hugetlb_unregister_node(node);
861}
862
863static void init_node_hugetlb_work(int nid)
864{
865 INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
866}
867
868static int node_memory_callback(struct notifier_block *self,
869 unsigned long action, void *arg)
870{
871 struct memory_notify *mnb = arg;
872 int nid = mnb->status_change_nid;
873
874 switch (action) {
875 case MEM_ONLINE:
876 case MEM_OFFLINE:
877
878
879
880
881 if (nid != NUMA_NO_NODE)
882 schedule_work(&node_devices[nid]->node_work);
883 break;
884
885 case MEM_GOING_ONLINE:
886 case MEM_GOING_OFFLINE:
887 case MEM_CANCEL_ONLINE:
888 case MEM_CANCEL_OFFLINE:
889 default:
890 break;
891 }
892
893 return NOTIFY_OK;
894}
895#endif
896#endif
897
898#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
899 !defined(CONFIG_HUGETLBFS)
900static inline int node_memory_callback(struct notifier_block *self,
901 unsigned long action, void *arg)
902{
903 return NOTIFY_OK;
904}
905
906static void init_node_hugetlb_work(int nid) { }
907
908#endif
909
910int __register_one_node(int nid)
911{
912 int error;
913 int cpu;
914
915 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
916 if (!node_devices[nid])
917 return -ENOMEM;
918
919 error = register_node(node_devices[nid], nid);
920
921
922 for_each_present_cpu(cpu) {
923 if (cpu_to_node(cpu) == nid)
924 register_cpu_under_node(cpu, nid);
925 }
926
927 INIT_LIST_HEAD(&node_devices[nid]->access_list);
928
929 init_node_hugetlb_work(nid);
930 node_init_caches(nid);
931
932 return error;
933}
934
935void unregister_one_node(int nid)
936{
937 if (!node_devices[nid])
938 return;
939
940 unregister_node(node_devices[nid]);
941 node_devices[nid] = NULL;
942}
943
944
945
946
947
948static ssize_t print_nodes_state(enum node_states state, char *buf)
949{
950 int n;
951
952 n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
953 nodemask_pr_args(&node_states[state]));
954 buf[n++] = '\n';
955 buf[n] = '\0';
956 return n;
957}
958
959struct node_attr {
960 struct device_attribute attr;
961 enum node_states state;
962};
963
964static ssize_t show_node_state(struct device *dev,
965 struct device_attribute *attr, char *buf)
966{
967 struct node_attr *na = container_of(attr, struct node_attr, attr);
968 return print_nodes_state(na->state, buf);
969}
970
971#define _NODE_ATTR(name, state) \
972 { __ATTR(name, 0444, show_node_state, NULL), state }
973
974static struct node_attr node_state_attr[] = {
975 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
976 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
977 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
978#ifdef CONFIG_HIGHMEM
979 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
980#endif
981 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
982 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
983};
984
985static struct attribute *node_state_attrs[] = {
986 &node_state_attr[N_POSSIBLE].attr.attr,
987 &node_state_attr[N_ONLINE].attr.attr,
988 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
989#ifdef CONFIG_HIGHMEM
990 &node_state_attr[N_HIGH_MEMORY].attr.attr,
991#endif
992 &node_state_attr[N_MEMORY].attr.attr,
993 &node_state_attr[N_CPU].attr.attr,
994 NULL
995};
996
997static struct attribute_group memory_root_attr_group = {
998 .attrs = node_state_attrs,
999};
1000
1001static const struct attribute_group *cpu_root_attr_groups[] = {
1002 &memory_root_attr_group,
1003 NULL,
1004};
1005
1006#define NODE_CALLBACK_PRI 2
1007static int __init register_node_type(void)
1008{
1009 int ret;
1010
1011 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
1012 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
1013
1014 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
1015 if (!ret) {
1016 static struct notifier_block node_memory_callback_nb = {
1017 .notifier_call = node_memory_callback,
1018 .priority = NODE_CALLBACK_PRI,
1019 };
1020 register_hotmemory_notifier(&node_memory_callback_nb);
1021 }
1022
1023
1024
1025
1026
1027 return ret;
1028}
1029postcore_initcall(register_node_type);
1030