This source file includes following definitions.
- node_read_cpumap
- node_read_cpumask
- node_read_cpulist
- node_remove_accesses
- node_access_release
- node_init_node_access
- node_set_perf_attrs
- node_cache_release
- node_cacheinfo_release
- node_init_cache_dev
- node_add_cache
- node_remove_caches
- node_init_caches
- node_init_caches
- node_remove_caches
- node_read_meminfo
- node_read_numastat
- node_read_vmstat
- node_read_distance
- hugetlb_register_node
- hugetlb_unregister_node
- register_hugetlbfs_with_node
- hugetlb_register_node
- hugetlb_unregister_node
- node_device_release
- register_node
- unregister_node
- register_cpu_under_node
- register_memory_node_under_compute_node
- unregister_cpu_under_node
- get_nid_for_pfn
- register_mem_sect_under_node
- unregister_memory_block_under_nodes
- link_mem_sections
- node_hugetlb_work
- init_node_hugetlb_work
- node_memory_callback
- node_memory_callback
- init_node_hugetlb_work
- __register_one_node
- unregister_one_node
- print_nodes_state
- show_node_state
- register_node_type
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
24 static struct bus_type node_subsys = {
25 .name = "node",
26 .dev_name = "node",
27 };
28
29
30 static 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
49 static 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 }
54 static 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
60 static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
61 static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
62
63
64
65
66
67
68
69
70
71 struct 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
81 static struct attribute *node_init_access_node_attrs[] = {
82 NULL,
83 };
84
85 static struct attribute *node_targ_access_node_attrs[] = {
86 NULL,
87 };
88
89 static const struct attribute_group initiators = {
90 .name = "initiators",
91 .attrs = node_init_access_node_attrs,
92 };
93
94 static const struct attribute_group targets = {
95 .name = "targets",
96 .attrs = node_targ_access_node_attrs,
97 };
98
99 static const struct attribute_group *node_access_node_groups[] = {
100 &initiators,
101 &targets,
102 NULL,
103 };
104
105 static 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
115 static void node_access_release(struct device *dev)
116 {
117 kfree(to_access_nodes(dev));
118 }
119
120 static 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;
148 free_name:
149 kfree_const(dev->kobj.name);
150 free:
151 kfree(access_node);
152 return NULL;
153 }
154
155 #ifdef CONFIG_HMEM_REPORTING
156 #define ACCESS_ATTR(name) \
157 static 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 } \
163 static DEVICE_ATTR_RO(name);
164
165 ACCESS_ATTR(read_bandwidth)
166 ACCESS_ATTR(read_latency)
167 ACCESS_ATTR(write_bandwidth)
168 ACCESS_ATTR(write_latency)
169
170 static 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
184 void 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
216 struct 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) \
224 static 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 } \
230 DEVICE_ATTR_RO(name);
231
232 CACHE_ATTR(size, "%llu")
233 CACHE_ATTR(line_size, "%u")
234 CACHE_ATTR(indexing, "%u")
235 CACHE_ATTR(write_policy, "%u")
236
237 static 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 };
244 ATTRIBUTE_GROUPS(cache);
245
246 static void node_cache_release(struct device *dev)
247 {
248 kfree(dev);
249 }
250
251 static void node_cacheinfo_release(struct device *dev)
252 {
253 struct node_cache_info *info = to_cache_info(dev);
254 kfree(info);
255 }
256
257 static 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;
276 free_name:
277 kfree_const(dev->kobj.name);
278 free_dev:
279 kfree(dev);
280 }
281
282
283
284
285
286
287 void 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;
331 free_name:
332 kfree_const(dev->kobj.name);
333 free_cache:
334 kfree(info);
335 }
336
337 static 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
351 static void node_init_caches(unsigned int nid)
352 {
353 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);
354 }
355 #else
356 static void node_init_caches(unsigned int nid) { }
357 static void node_remove_caches(struct node *node) { }
358 #endif
359
360 #define K(x) ((x) << (PAGE_SHIFT - 10))
361 static 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 "Node %d FileHugePages: %8lu kB\n"
431 "Node %d FilePmdMapped: %8lu kB\n"
432 #endif
433 ,
434 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
435 nid, K(node_page_state(pgdat, NR_WRITEBACK)),
436 nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
437 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
438 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
439 nid, K(i.sharedram),
440 nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB),
441 nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
442 nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
443 nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
444 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
445 nid, K(sreclaimable +
446 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
447 nid, K(sreclaimable + sunreclaimable),
448 nid, K(sreclaimable),
449 nid, K(sunreclaimable)
450 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
451 ,
452 nid, K(node_page_state(pgdat, NR_ANON_THPS) *
453 HPAGE_PMD_NR),
454 nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
455 HPAGE_PMD_NR),
456 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
457 HPAGE_PMD_NR),
458 nid, K(node_page_state(pgdat, NR_FILE_THPS) *
459 HPAGE_PMD_NR),
460 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) *
461 HPAGE_PMD_NR)
462 #endif
463 );
464 n += hugetlb_report_node_meminfo(nid, buf + n);
465 return n;
466 }
467
468 #undef K
469 static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
470
471 static ssize_t node_read_numastat(struct device *dev,
472 struct device_attribute *attr, char *buf)
473 {
474 return sprintf(buf,
475 "numa_hit %lu\n"
476 "numa_miss %lu\n"
477 "numa_foreign %lu\n"
478 "interleave_hit %lu\n"
479 "local_node %lu\n"
480 "other_node %lu\n",
481 sum_zone_numa_state(dev->id, NUMA_HIT),
482 sum_zone_numa_state(dev->id, NUMA_MISS),
483 sum_zone_numa_state(dev->id, NUMA_FOREIGN),
484 sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
485 sum_zone_numa_state(dev->id, NUMA_LOCAL),
486 sum_zone_numa_state(dev->id, NUMA_OTHER));
487 }
488 static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
489
490 static ssize_t node_read_vmstat(struct device *dev,
491 struct device_attribute *attr, char *buf)
492 {
493 int nid = dev->id;
494 struct pglist_data *pgdat = NODE_DATA(nid);
495 int i;
496 int n = 0;
497
498 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
499 n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
500 sum_zone_node_page_state(nid, i));
501
502 #ifdef CONFIG_NUMA
503 for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
504 n += sprintf(buf+n, "%s %lu\n",
505 vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
506 sum_zone_numa_state(nid, i));
507 #endif
508
509 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
510 n += sprintf(buf+n, "%s %lu\n",
511 vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
512 NR_VM_NUMA_STAT_ITEMS],
513 node_page_state(pgdat, i));
514
515 return n;
516 }
517 static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
518
519 static ssize_t node_read_distance(struct device *dev,
520 struct device_attribute *attr, char *buf)
521 {
522 int nid = dev->id;
523 int len = 0;
524 int i;
525
526
527
528
529
530 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
531
532 for_each_online_node(i)
533 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
534
535 len += sprintf(buf + len, "\n");
536 return len;
537 }
538 static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);
539
540 static struct attribute *node_dev_attrs[] = {
541 &dev_attr_cpumap.attr,
542 &dev_attr_cpulist.attr,
543 &dev_attr_meminfo.attr,
544 &dev_attr_numastat.attr,
545 &dev_attr_distance.attr,
546 &dev_attr_vmstat.attr,
547 NULL
548 };
549 ATTRIBUTE_GROUPS(node_dev);
550
551 #ifdef CONFIG_HUGETLBFS
552
553
554
555
556
557
558
559
560
561 static node_registration_func_t __hugetlb_register_node;
562 static node_registration_func_t __hugetlb_unregister_node;
563
564 static inline bool hugetlb_register_node(struct node *node)
565 {
566 if (__hugetlb_register_node &&
567 node_state(node->dev.id, N_MEMORY)) {
568 __hugetlb_register_node(node);
569 return true;
570 }
571 return false;
572 }
573
574 static inline void hugetlb_unregister_node(struct node *node)
575 {
576 if (__hugetlb_unregister_node)
577 __hugetlb_unregister_node(node);
578 }
579
580 void register_hugetlbfs_with_node(node_registration_func_t doregister,
581 node_registration_func_t unregister)
582 {
583 __hugetlb_register_node = doregister;
584 __hugetlb_unregister_node = unregister;
585 }
586 #else
587 static inline void hugetlb_register_node(struct node *node) {}
588
589 static inline void hugetlb_unregister_node(struct node *node) {}
590 #endif
591
592 static void node_device_release(struct device *dev)
593 {
594 struct node *node = to_node(dev);
595
596 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
597
598
599
600
601
602
603
604
605
606 flush_work(&node->node_work);
607 #endif
608 kfree(node);
609 }
610
611
612
613
614
615
616
617 static int register_node(struct node *node, int num)
618 {
619 int error;
620
621 node->dev.id = num;
622 node->dev.bus = &node_subsys;
623 node->dev.release = node_device_release;
624 node->dev.groups = node_dev_groups;
625 error = device_register(&node->dev);
626
627 if (error)
628 put_device(&node->dev);
629 else {
630 hugetlb_register_node(node);
631
632 compaction_register_node(node);
633 }
634 return error;
635 }
636
637
638
639
640
641
642
643
644 void unregister_node(struct node *node)
645 {
646 hugetlb_unregister_node(node);
647 node_remove_accesses(node);
648 node_remove_caches(node);
649 device_unregister(&node->dev);
650 }
651
652 struct node *node_devices[MAX_NUMNODES];
653
654
655
656
657 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
658 {
659 int ret;
660 struct device *obj;
661
662 if (!node_online(nid))
663 return 0;
664
665 obj = get_cpu_device(cpu);
666 if (!obj)
667 return 0;
668
669 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
670 &obj->kobj,
671 kobject_name(&obj->kobj));
672 if (ret)
673 return ret;
674
675 return sysfs_create_link(&obj->kobj,
676 &node_devices[nid]->dev.kobj,
677 kobject_name(&node_devices[nid]->dev.kobj));
678 }
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693 int register_memory_node_under_compute_node(unsigned int mem_nid,
694 unsigned int cpu_nid,
695 unsigned access)
696 {
697 struct node *init_node, *targ_node;
698 struct node_access_nodes *initiator, *target;
699 int ret;
700
701 if (!node_online(cpu_nid) || !node_online(mem_nid))
702 return -ENODEV;
703
704 init_node = node_devices[cpu_nid];
705 targ_node = node_devices[mem_nid];
706 initiator = node_init_node_access(init_node, access);
707 target = node_init_node_access(targ_node, access);
708 if (!initiator || !target)
709 return -ENOMEM;
710
711 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets",
712 &targ_node->dev.kobj,
713 dev_name(&targ_node->dev));
714 if (ret)
715 return ret;
716
717 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators",
718 &init_node->dev.kobj,
719 dev_name(&init_node->dev));
720 if (ret)
721 goto err;
722
723 return 0;
724 err:
725 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets",
726 dev_name(&targ_node->dev));
727 return ret;
728 }
729
730 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
731 {
732 struct device *obj;
733
734 if (!node_online(nid))
735 return 0;
736
737 obj = get_cpu_device(cpu);
738 if (!obj)
739 return 0;
740
741 sysfs_remove_link(&node_devices[nid]->dev.kobj,
742 kobject_name(&obj->kobj));
743 sysfs_remove_link(&obj->kobj,
744 kobject_name(&node_devices[nid]->dev.kobj));
745
746 return 0;
747 }
748
749 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
750 static int __ref get_nid_for_pfn(unsigned long pfn)
751 {
752 if (!pfn_valid_within(pfn))
753 return -1;
754 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
755 if (system_state < SYSTEM_RUNNING)
756 return early_pfn_to_nid(pfn);
757 #endif
758 return pfn_to_nid(pfn);
759 }
760
761
762 static int register_mem_sect_under_node(struct memory_block *mem_blk,
763 void *arg)
764 {
765 unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
766 unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
767 unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
768 int ret, nid = *(int *)arg;
769 unsigned long pfn;
770
771 for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
772 int page_nid;
773
774
775
776
777
778 if (!pfn_present(pfn)) {
779 pfn = round_down(pfn + PAGES_PER_SECTION,
780 PAGES_PER_SECTION) - 1;
781 continue;
782 }
783
784
785
786
787
788
789 if (system_state == SYSTEM_BOOTING) {
790 page_nid = get_nid_for_pfn(pfn);
791 if (page_nid < 0)
792 continue;
793 if (page_nid != nid)
794 continue;
795 }
796
797
798
799
800
801 mem_blk->nid = nid;
802
803 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
804 &mem_blk->dev.kobj,
805 kobject_name(&mem_blk->dev.kobj));
806 if (ret)
807 return ret;
808
809 return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
810 &node_devices[nid]->dev.kobj,
811 kobject_name(&node_devices[nid]->dev.kobj));
812 }
813
814 return 0;
815 }
816
817
818
819
820
821 void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
822 {
823 if (mem_blk->nid == NUMA_NO_NODE)
824 return;
825
826 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj,
827 kobject_name(&mem_blk->dev.kobj));
828 sysfs_remove_link(&mem_blk->dev.kobj,
829 kobject_name(&node_devices[mem_blk->nid]->dev.kobj));
830 }
831
832 int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn)
833 {
834 return walk_memory_blocks(PFN_PHYS(start_pfn),
835 PFN_PHYS(end_pfn - start_pfn), (void *)&nid,
836 register_mem_sect_under_node);
837 }
838
839 #ifdef CONFIG_HUGETLBFS
840
841
842
843
844 static void node_hugetlb_work(struct work_struct *work)
845 {
846 struct node *node = container_of(work, struct node, node_work);
847
848
849
850
851
852
853
854
855
856 if (!hugetlb_register_node(node))
857 hugetlb_unregister_node(node);
858 }
859
860 static void init_node_hugetlb_work(int nid)
861 {
862 INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
863 }
864
865 static int node_memory_callback(struct notifier_block *self,
866 unsigned long action, void *arg)
867 {
868 struct memory_notify *mnb = arg;
869 int nid = mnb->status_change_nid;
870
871 switch (action) {
872 case MEM_ONLINE:
873 case MEM_OFFLINE:
874
875
876
877
878 if (nid != NUMA_NO_NODE)
879 schedule_work(&node_devices[nid]->node_work);
880 break;
881
882 case MEM_GOING_ONLINE:
883 case MEM_GOING_OFFLINE:
884 case MEM_CANCEL_ONLINE:
885 case MEM_CANCEL_OFFLINE:
886 default:
887 break;
888 }
889
890 return NOTIFY_OK;
891 }
892 #endif
893 #endif
894
895 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
896 !defined(CONFIG_HUGETLBFS)
897 static inline int node_memory_callback(struct notifier_block *self,
898 unsigned long action, void *arg)
899 {
900 return NOTIFY_OK;
901 }
902
903 static void init_node_hugetlb_work(int nid) { }
904
905 #endif
906
907 int __register_one_node(int nid)
908 {
909 int error;
910 int cpu;
911
912 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
913 if (!node_devices[nid])
914 return -ENOMEM;
915
916 error = register_node(node_devices[nid], nid);
917
918
919 for_each_present_cpu(cpu) {
920 if (cpu_to_node(cpu) == nid)
921 register_cpu_under_node(cpu, nid);
922 }
923
924 INIT_LIST_HEAD(&node_devices[nid]->access_list);
925
926 init_node_hugetlb_work(nid);
927 node_init_caches(nid);
928
929 return error;
930 }
931
932 void unregister_one_node(int nid)
933 {
934 if (!node_devices[nid])
935 return;
936
937 unregister_node(node_devices[nid]);
938 node_devices[nid] = NULL;
939 }
940
941
942
943
944
945 static ssize_t print_nodes_state(enum node_states state, char *buf)
946 {
947 int n;
948
949 n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
950 nodemask_pr_args(&node_states[state]));
951 buf[n++] = '\n';
952 buf[n] = '\0';
953 return n;
954 }
955
956 struct node_attr {
957 struct device_attribute attr;
958 enum node_states state;
959 };
960
961 static ssize_t show_node_state(struct device *dev,
962 struct device_attribute *attr, char *buf)
963 {
964 struct node_attr *na = container_of(attr, struct node_attr, attr);
965 return print_nodes_state(na->state, buf);
966 }
967
968 #define _NODE_ATTR(name, state) \
969 { __ATTR(name, 0444, show_node_state, NULL), state }
970
971 static struct node_attr node_state_attr[] = {
972 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
973 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
974 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
975 #ifdef CONFIG_HIGHMEM
976 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
977 #endif
978 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
979 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
980 };
981
982 static struct attribute *node_state_attrs[] = {
983 &node_state_attr[N_POSSIBLE].attr.attr,
984 &node_state_attr[N_ONLINE].attr.attr,
985 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
986 #ifdef CONFIG_HIGHMEM
987 &node_state_attr[N_HIGH_MEMORY].attr.attr,
988 #endif
989 &node_state_attr[N_MEMORY].attr.attr,
990 &node_state_attr[N_CPU].attr.attr,
991 NULL
992 };
993
994 static struct attribute_group memory_root_attr_group = {
995 .attrs = node_state_attrs,
996 };
997
998 static const struct attribute_group *cpu_root_attr_groups[] = {
999 &memory_root_attr_group,
1000 NULL,
1001 };
1002
1003 #define NODE_CALLBACK_PRI 2
1004 static int __init register_node_type(void)
1005 {
1006 int ret;
1007
1008 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
1009 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
1010
1011 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
1012 if (!ret) {
1013 static struct notifier_block node_memory_callback_nb = {
1014 .notifier_call = node_memory_callback,
1015 .priority = NODE_CALLBACK_PRI,
1016 };
1017 register_hotmemory_notifier(&node_memory_callback_nb);
1018 }
1019
1020
1021
1022
1023
1024 return ret;
1025 }
1026 postcore_initcall(register_node_type);