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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Basic Node interface support
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 /* 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 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 * struct node_access_nodes - Access class device to hold user visible
65 * relationships to other nodes.
66 * @dev: Device for this memory access class
67 * @list_node: List element in the node's access list
68 * @access: The access class rank
69 * @hmem_attrs: Heterogeneous memory performance attributes
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 * node_set_perf_attrs - Set the performance values for given access class
180 * @nid: Node identifier to be set
181 * @hmem_attrs: Heterogeneous memory performance attributes
182 * @access: The access class the for the given attributes
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 * struct node_cache_info - Internal tracking for memory node caches
212 * @dev: Device represeting the cache level
213 * @node: List element for tracking in the node
214 * @cache_attrs:Attributes for this cache level
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 * node_add_cache() - add cache attribute to a memory node
284 * @nid: Node identifier that has new cache attributes
285 * @cache_attrs: Attributes for the cache being added
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_pages(pgdat, NR_SLAB_RECLAIMABLE_B);
372 sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B);
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#ifdef CONFIG_SHADOW_CALL_STACK
419 "Node %d ShadowCallStack:%8lu kB\n"
420#endif
421 "Node %d PageTables: %8lu kB\n"
422 "Node %d NFS_Unstable: %8lu kB\n"
423 "Node %d Bounce: %8lu kB\n"
424 "Node %d WritebackTmp: %8lu kB\n"
425 "Node %d KReclaimable: %8lu kB\n"
426 "Node %d Slab: %8lu kB\n"
427 "Node %d SReclaimable: %8lu kB\n"
428 "Node %d SUnreclaim: %8lu kB\n"
429#ifdef CONFIG_TRANSPARENT_HUGEPAGE
430 "Node %d AnonHugePages: %8lu kB\n"
431 "Node %d ShmemHugePages: %8lu kB\n"
432 "Node %d ShmemPmdMapped: %8lu kB\n"
433 "Node %d FileHugePages: %8lu kB\n"
434 "Node %d FilePmdMapped: %8lu kB\n"
435#endif
436 ,
437 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
438 nid, K(node_page_state(pgdat, NR_WRITEBACK)),
439 nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
440 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
441 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
442 nid, K(i.sharedram),
443 nid, node_page_state(pgdat, NR_KERNEL_STACK_KB),
444#ifdef CONFIG_SHADOW_CALL_STACK
445 nid, node_page_state(pgdat, NR_KERNEL_SCS_KB),
446#endif
447 nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
448 nid, 0UL,
449 nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
450 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
451 nid, K(sreclaimable +
452 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
453 nid, K(sreclaimable + sunreclaimable),
454 nid, K(sreclaimable),
455 nid, K(sunreclaimable)
456#ifdef CONFIG_TRANSPARENT_HUGEPAGE
457 ,
458 nid, K(node_page_state(pgdat, NR_ANON_THPS) *
459 HPAGE_PMD_NR),
460 nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
461 HPAGE_PMD_NR),
462 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
463 HPAGE_PMD_NR),
464 nid, K(node_page_state(pgdat, NR_FILE_THPS) *
465 HPAGE_PMD_NR),
466 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) *
467 HPAGE_PMD_NR)
468#endif
469 );
470 n += hugetlb_report_node_meminfo(nid, buf + n);
471 return n;
472}
473
474#undef K
475static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
476
477static ssize_t node_read_numastat(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
480 return sprintf(buf,
481 "numa_hit %lu\n"
482 "numa_miss %lu\n"
483 "numa_foreign %lu\n"
484 "interleave_hit %lu\n"
485 "local_node %lu\n"
486 "other_node %lu\n",
487 sum_zone_numa_state(dev->id, NUMA_HIT),
488 sum_zone_numa_state(dev->id, NUMA_MISS),
489 sum_zone_numa_state(dev->id, NUMA_FOREIGN),
490 sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
491 sum_zone_numa_state(dev->id, NUMA_LOCAL),
492 sum_zone_numa_state(dev->id, NUMA_OTHER));
493}
494static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
495
496static ssize_t node_read_vmstat(struct device *dev,
497 struct device_attribute *attr, char *buf)
498{
499 int nid = dev->id;
500 struct pglist_data *pgdat = NODE_DATA(nid);
501 int i;
502 int n = 0;
503
504 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
505 n += sprintf(buf+n, "%s %lu\n", zone_stat_name(i),
506 sum_zone_node_page_state(nid, i));
507
508#ifdef CONFIG_NUMA
509 for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
510 n += sprintf(buf+n, "%s %lu\n", numa_stat_name(i),
511 sum_zone_numa_state(nid, i));
512#endif
513
514 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
515 n += sprintf(buf+n, "%s %lu\n", node_stat_name(i),
516 node_page_state_pages(pgdat, i));
517
518 return n;
519}
520static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
521
522static ssize_t node_read_distance(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
525 int nid = dev->id;
526 int len = 0;
527 int i;
528
529 /*
530 * buf is currently PAGE_SIZE in length and each node needs 4 chars
531 * at the most (distance + space or newline).
532 */
533 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
534
535 for_each_online_node(i)
536 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
537
538 len += sprintf(buf + len, "\n");
539 return len;
540}
541static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);
542
543static struct attribute *node_dev_attrs[] = {
544 &dev_attr_cpumap.attr,
545 &dev_attr_cpulist.attr,
546 &dev_attr_meminfo.attr,
547 &dev_attr_numastat.attr,
548 &dev_attr_distance.attr,
549 &dev_attr_vmstat.attr,
550 NULL
551};
552ATTRIBUTE_GROUPS(node_dev);
553
554#ifdef CONFIG_HUGETLBFS
555/*
556 * hugetlbfs per node attributes registration interface:
557 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
558 * it will register its per node attributes for all online nodes with
559 * memory. It will also call register_hugetlbfs_with_node(), below, to
560 * register its attribute registration functions with this node driver.
561 * Once these hooks have been initialized, the node driver will call into
562 * the hugetlb module to [un]register attributes for hot-plugged nodes.
563 */
564static node_registration_func_t __hugetlb_register_node;
565static node_registration_func_t __hugetlb_unregister_node;
566
567static inline bool hugetlb_register_node(struct node *node)
568{
569 if (__hugetlb_register_node &&
570 node_state(node->dev.id, N_MEMORY)) {
571 __hugetlb_register_node(node);
572 return true;
573 }
574 return false;
575}
576
577static inline void hugetlb_unregister_node(struct node *node)
578{
579 if (__hugetlb_unregister_node)
580 __hugetlb_unregister_node(node);
581}
582
583void register_hugetlbfs_with_node(node_registration_func_t doregister,
584 node_registration_func_t unregister)
585{
586 __hugetlb_register_node = doregister;
587 __hugetlb_unregister_node = unregister;
588}
589#else
590static inline void hugetlb_register_node(struct node *node) {}
591
592static inline void hugetlb_unregister_node(struct node *node) {}
593#endif
594
595static void node_device_release(struct device *dev)
596{
597 struct node *node = to_node(dev);
598
599#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
600 /*
601 * We schedule the work only when a memory section is
602 * onlined/offlined on this node. When we come here,
603 * all the memory on this node has been offlined,
604 * so we won't enqueue new work to this work.
605 *
606 * The work is using node->node_work, so we should
607 * flush work before freeing the memory.
608 */
609 flush_work(&node->node_work);
610#endif
611 kfree(node);
612}
613
614/*
615 * register_node - Setup a sysfs device for a node.
616 * @num - Node number to use when creating the device.
617 *
618 * Initialize and register the node device.
619 */
620static int register_node(struct node *node, int num)
621{
622 int error;
623
624 node->dev.id = num;
625 node->dev.bus = &node_subsys;
626 node->dev.release = node_device_release;
627 node->dev.groups = node_dev_groups;
628 error = device_register(&node->dev);
629
630 if (error)
631 put_device(&node->dev);
632 else {
633 hugetlb_register_node(node);
634
635 compaction_register_node(node);
636 }
637 return error;
638}
639
640/**
641 * unregister_node - unregister a node device
642 * @node: node going away
643 *
644 * Unregisters a node device @node. All the devices on the node must be
645 * unregistered before calling this function.
646 */
647void unregister_node(struct node *node)
648{
649 hugetlb_unregister_node(node); /* no-op, if memoryless node */
650 node_remove_accesses(node);
651 node_remove_caches(node);
652 device_unregister(&node->dev);
653}
654
655struct node *node_devices[MAX_NUMNODES];
656
657/*
658 * register cpu under node
659 */
660int register_cpu_under_node(unsigned int cpu, unsigned int nid)
661{
662 int ret;
663 struct device *obj;
664
665 if (!node_online(nid))
666 return 0;
667
668 obj = get_cpu_device(cpu);
669 if (!obj)
670 return 0;
671
672 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
673 &obj->kobj,
674 kobject_name(&obj->kobj));
675 if (ret)
676 return ret;
677
678 return sysfs_create_link(&obj->kobj,
679 &node_devices[nid]->dev.kobj,
680 kobject_name(&node_devices[nid]->dev.kobj));
681}
682
683/**
684 * register_memory_node_under_compute_node - link memory node to its compute
685 * node for a given access class.
686 * @mem_nid: Memory node number
687 * @cpu_nid: Cpu node number
688 * @access: Access class to register
689 *
690 * Description:
691 * For use with platforms that may have separate memory and compute nodes.
692 * This function will export node relationships linking which memory
693 * initiator nodes can access memory targets at a given ranked access
694 * class.
695 */
696int register_memory_node_under_compute_node(unsigned int mem_nid,
697 unsigned int cpu_nid,
698 unsigned access)
699{
700 struct node *init_node, *targ_node;
701 struct node_access_nodes *initiator, *target;
702 int ret;
703
704 if (!node_online(cpu_nid) || !node_online(mem_nid))
705 return -ENODEV;
706
707 init_node = node_devices[cpu_nid];
708 targ_node = node_devices[mem_nid];
709 initiator = node_init_node_access(init_node, access);
710 target = node_init_node_access(targ_node, access);
711 if (!initiator || !target)
712 return -ENOMEM;
713
714 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets",
715 &targ_node->dev.kobj,
716 dev_name(&targ_node->dev));
717 if (ret)
718 return ret;
719
720 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators",
721 &init_node->dev.kobj,
722 dev_name(&init_node->dev));
723 if (ret)
724 goto err;
725
726 return 0;
727 err:
728 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets",
729 dev_name(&targ_node->dev));
730 return ret;
731}
732
733int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
734{
735 struct device *obj;
736
737 if (!node_online(nid))
738 return 0;
739
740 obj = get_cpu_device(cpu);
741 if (!obj)
742 return 0;
743
744 sysfs_remove_link(&node_devices[nid]->dev.kobj,
745 kobject_name(&obj->kobj));
746 sysfs_remove_link(&obj->kobj,
747 kobject_name(&node_devices[nid]->dev.kobj));
748
749 return 0;
750}
751
752#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
753static int __ref get_nid_for_pfn(unsigned long pfn)
754{
755 if (!pfn_valid_within(pfn))
756 return -1;
757#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
758 if (system_state < SYSTEM_RUNNING)
759 return early_pfn_to_nid(pfn);
760#endif
761 return pfn_to_nid(pfn);
762}
763
764static int do_register_memory_block_under_node(int nid,
765 struct memory_block *mem_blk)
766{
767 int ret;
768
769 /*
770 * If this memory block spans multiple nodes, we only indicate
771 * the last processed node.
772 */
773 mem_blk->nid = nid;
774
775 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
776 &mem_blk->dev.kobj,
777 kobject_name(&mem_blk->dev.kobj));
778 if (ret)
779 return ret;
780
781 return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
782 &node_devices[nid]->dev.kobj,
783 kobject_name(&node_devices[nid]->dev.kobj));
784}
785
786/* register memory section under specified node if it spans that node */
787static int register_mem_block_under_node_early(struct memory_block *mem_blk,
788 void *arg)
789{
790 unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
791 unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
792 unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
793 int nid = *(int *)arg;
794 unsigned long pfn;
795
796 for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
797 int page_nid;
798
799 /*
800 * memory block could have several absent sections from start.
801 * skip pfn range from absent section
802 */
803 if (!pfn_in_present_section(pfn)) {
804 pfn = round_down(pfn + PAGES_PER_SECTION,
805 PAGES_PER_SECTION) - 1;
806 continue;
807 }
808
809 /*
810 * We need to check if page belongs to nid only at the boot
811 * case because node's ranges can be interleaved.
812 */
813 page_nid = get_nid_for_pfn(pfn);
814 if (page_nid < 0)
815 continue;
816 if (page_nid != nid)
817 continue;
818
819 return do_register_memory_block_under_node(nid, mem_blk);
820 }
821 /* mem section does not span the specified node */
822 return 0;
823}
824
825/*
826 * During hotplug we know that all pages in the memory block belong to the same
827 * node.
828 */
829static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk,
830 void *arg)
831{
832 int nid = *(int *)arg;
833
834 return do_register_memory_block_under_node(nid, mem_blk);
835}
836
837/*
838 * Unregister a memory block device under the node it spans. Memory blocks
839 * with multiple nodes cannot be offlined and therefore also never be removed.
840 */
841void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
842{
843 if (mem_blk->nid == NUMA_NO_NODE)
844 return;
845
846 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj,
847 kobject_name(&mem_blk->dev.kobj));
848 sysfs_remove_link(&mem_blk->dev.kobj,
849 kobject_name(&node_devices[mem_blk->nid]->dev.kobj));
850}
851
852int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn,
853 enum meminit_context context)
854{
855 walk_memory_blocks_func_t func;
856
857 if (context == MEMINIT_HOTPLUG)
858 func = register_mem_block_under_node_hotplug;
859 else
860 func = register_mem_block_under_node_early;
861
862 return walk_memory_blocks(PFN_PHYS(start_pfn),
863 PFN_PHYS(end_pfn - start_pfn), (void *)&nid,
864 func);
865}
866
867#ifdef CONFIG_HUGETLBFS
868/*
869 * Handle per node hstate attribute [un]registration on transistions
870 * to/from memoryless state.
871 */
872static void node_hugetlb_work(struct work_struct *work)
873{
874 struct node *node = container_of(work, struct node, node_work);
875
876 /*
877 * We only get here when a node transitions to/from memoryless state.
878 * We can detect which transition occurred by examining whether the
879 * node has memory now. hugetlb_register_node() already check this
880 * so we try to register the attributes. If that fails, then the
881 * node has transitioned to memoryless, try to unregister the
882 * attributes.
883 */
884 if (!hugetlb_register_node(node))
885 hugetlb_unregister_node(node);
886}
887
888static void init_node_hugetlb_work(int nid)
889{
890 INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
891}
892
893static int node_memory_callback(struct notifier_block *self,
894 unsigned long action, void *arg)
895{
896 struct memory_notify *mnb = arg;
897 int nid = mnb->status_change_nid;
898
899 switch (action) {
900 case MEM_ONLINE:
901 case MEM_OFFLINE:
902 /*
903 * offload per node hstate [un]registration to a work thread
904 * when transitioning to/from memoryless state.
905 */
906 if (nid != NUMA_NO_NODE)
907 schedule_work(&node_devices[nid]->node_work);
908 break;
909
910 case MEM_GOING_ONLINE:
911 case MEM_GOING_OFFLINE:
912 case MEM_CANCEL_ONLINE:
913 case MEM_CANCEL_OFFLINE:
914 default:
915 break;
916 }
917
918 return NOTIFY_OK;
919}
920#endif /* CONFIG_HUGETLBFS */
921#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
922
923#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
924 !defined(CONFIG_HUGETLBFS)
925static inline int node_memory_callback(struct notifier_block *self,
926 unsigned long action, void *arg)
927{
928 return NOTIFY_OK;
929}
930
931static void init_node_hugetlb_work(int nid) { }
932
933#endif
934
935int __register_one_node(int nid)
936{
937 int error;
938 int cpu;
939
940 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
941 if (!node_devices[nid])
942 return -ENOMEM;
943
944 error = register_node(node_devices[nid], nid);
945
946 /* link cpu under this node */
947 for_each_present_cpu(cpu) {
948 if (cpu_to_node(cpu) == nid)
949 register_cpu_under_node(cpu, nid);
950 }
951
952 INIT_LIST_HEAD(&node_devices[nid]->access_list);
953 /* initialize work queue for memory hot plug */
954 init_node_hugetlb_work(nid);
955 node_init_caches(nid);
956
957 return error;
958}
959
960void unregister_one_node(int nid)
961{
962 if (!node_devices[nid])
963 return;
964
965 unregister_node(node_devices[nid]);
966 node_devices[nid] = NULL;
967}
968
969/*
970 * node states attributes
971 */
972
973static ssize_t print_nodes_state(enum node_states state, char *buf)
974{
975 int n;
976
977 n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
978 nodemask_pr_args(&node_states[state]));
979 buf[n++] = '\n';
980 buf[n] = '\0';
981 return n;
982}
983
984struct node_attr {
985 struct device_attribute attr;
986 enum node_states state;
987};
988
989static ssize_t show_node_state(struct device *dev,
990 struct device_attribute *attr, char *buf)
991{
992 struct node_attr *na = container_of(attr, struct node_attr, attr);
993 return print_nodes_state(na->state, buf);
994}
995
996#define _NODE_ATTR(name, state) \
997 { __ATTR(name, 0444, show_node_state, NULL), state }
998
999static struct node_attr node_state_attr[] = {
1000 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
1001 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
1002 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
1003#ifdef CONFIG_HIGHMEM
1004 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
1005#endif
1006 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
1007 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
1008};
1009
1010static struct attribute *node_state_attrs[] = {
1011 &node_state_attr[N_POSSIBLE].attr.attr,
1012 &node_state_attr[N_ONLINE].attr.attr,
1013 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
1014#ifdef CONFIG_HIGHMEM
1015 &node_state_attr[N_HIGH_MEMORY].attr.attr,
1016#endif
1017 &node_state_attr[N_MEMORY].attr.attr,
1018 &node_state_attr[N_CPU].attr.attr,
1019 NULL
1020};
1021
1022static struct attribute_group memory_root_attr_group = {
1023 .attrs = node_state_attrs,
1024};
1025
1026static const struct attribute_group *cpu_root_attr_groups[] = {
1027 &memory_root_attr_group,
1028 NULL,
1029};
1030
1031#define NODE_CALLBACK_PRI 2 /* lower than SLAB */
1032static int __init register_node_type(void)
1033{
1034 int ret;
1035
1036 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
1037 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
1038
1039 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
1040 if (!ret) {
1041 static struct notifier_block node_memory_callback_nb = {
1042 .notifier_call = node_memory_callback,
1043 .priority = NODE_CALLBACK_PRI,
1044 };
1045 register_hotmemory_notifier(&node_memory_callback_nb);
1046 }
1047
1048 /*
1049 * Note: we're not going to unregister the node class if we fail
1050 * to register the node state class attribute files.
1051 */
1052 return ret;
1053}
1054postcore_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/notifier.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 bus_type node_subsys = {
23 .name = "node",
24 .dev_name = "node",
25};
26
27
28static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
29{
30 struct node *node_dev = to_node(dev);
31 const struct cpumask *mask = cpumask_of_node(node_dev->dev.id);
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 return cpumap_print_to_pagebuf(list, buf, mask);
37}
38
39static inline ssize_t node_read_cpumask(struct device *dev,
40 struct device_attribute *attr, char *buf)
41{
42 return node_read_cpumap(dev, false, buf);
43}
44static inline ssize_t node_read_cpulist(struct device *dev,
45 struct device_attribute *attr, char *buf)
46{
47 return node_read_cpumap(dev, true, buf);
48}
49
50static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
51static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
52
53#define K(x) ((x) << (PAGE_SHIFT - 10))
54static ssize_t node_read_meminfo(struct device *dev,
55 struct device_attribute *attr, char *buf)
56{
57 int n;
58 int nid = dev->id;
59 struct sysinfo i;
60
61 si_meminfo_node(&i, nid);
62 n = sprintf(buf,
63 "Node %d MemTotal: %8lu kB\n"
64 "Node %d MemFree: %8lu kB\n"
65 "Node %d MemUsed: %8lu kB\n"
66 "Node %d Active: %8lu kB\n"
67 "Node %d Inactive: %8lu kB\n"
68 "Node %d Active(anon): %8lu kB\n"
69 "Node %d Inactive(anon): %8lu kB\n"
70 "Node %d Active(file): %8lu kB\n"
71 "Node %d Inactive(file): %8lu kB\n"
72 "Node %d Unevictable: %8lu kB\n"
73 "Node %d Mlocked: %8lu kB\n",
74 nid, K(i.totalram),
75 nid, K(i.freeram),
76 nid, K(i.totalram - i.freeram),
77 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
78 node_page_state(nid, NR_ACTIVE_FILE)),
79 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
80 node_page_state(nid, NR_INACTIVE_FILE)),
81 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
82 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
83 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
84 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
85 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
86 nid, K(node_page_state(nid, NR_MLOCK)));
87
88#ifdef CONFIG_HIGHMEM
89 n += sprintf(buf + n,
90 "Node %d HighTotal: %8lu kB\n"
91 "Node %d HighFree: %8lu kB\n"
92 "Node %d LowTotal: %8lu kB\n"
93 "Node %d LowFree: %8lu kB\n",
94 nid, K(i.totalhigh),
95 nid, K(i.freehigh),
96 nid, K(i.totalram - i.totalhigh),
97 nid, K(i.freeram - i.freehigh));
98#endif
99 n += sprintf(buf + n,
100 "Node %d Dirty: %8lu kB\n"
101 "Node %d Writeback: %8lu kB\n"
102 "Node %d FilePages: %8lu kB\n"
103 "Node %d Mapped: %8lu kB\n"
104 "Node %d AnonPages: %8lu kB\n"
105 "Node %d Shmem: %8lu kB\n"
106 "Node %d KernelStack: %8lu kB\n"
107 "Node %d PageTables: %8lu kB\n"
108 "Node %d NFS_Unstable: %8lu kB\n"
109 "Node %d Bounce: %8lu kB\n"
110 "Node %d WritebackTmp: %8lu kB\n"
111 "Node %d Slab: %8lu kB\n"
112 "Node %d SReclaimable: %8lu kB\n"
113 "Node %d SUnreclaim: %8lu kB\n"
114#ifdef CONFIG_TRANSPARENT_HUGEPAGE
115 "Node %d AnonHugePages: %8lu kB\n"
116#endif
117 ,
118 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
119 nid, K(node_page_state(nid, NR_WRITEBACK)),
120 nid, K(node_page_state(nid, NR_FILE_PAGES)),
121 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
122 nid, K(node_page_state(nid, NR_ANON_PAGES)),
123 nid, K(i.sharedram),
124 nid, node_page_state(nid, NR_KERNEL_STACK) *
125 THREAD_SIZE / 1024,
126 nid, K(node_page_state(nid, NR_PAGETABLE)),
127 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
128 nid, K(node_page_state(nid, NR_BOUNCE)),
129 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
130 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
131 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
132 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
133#ifdef CONFIG_TRANSPARENT_HUGEPAGE
134 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
135 , nid,
136 K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
137 HPAGE_PMD_NR));
138#else
139 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
140#endif
141 n += hugetlb_report_node_meminfo(nid, buf + n);
142 return n;
143}
144
145#undef K
146static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
147
148static ssize_t node_read_numastat(struct device *dev,
149 struct device_attribute *attr, char *buf)
150{
151 return sprintf(buf,
152 "numa_hit %lu\n"
153 "numa_miss %lu\n"
154 "numa_foreign %lu\n"
155 "interleave_hit %lu\n"
156 "local_node %lu\n"
157 "other_node %lu\n",
158 node_page_state(dev->id, NUMA_HIT),
159 node_page_state(dev->id, NUMA_MISS),
160 node_page_state(dev->id, NUMA_FOREIGN),
161 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
162 node_page_state(dev->id, NUMA_LOCAL),
163 node_page_state(dev->id, NUMA_OTHER));
164}
165static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
166
167static ssize_t node_read_vmstat(struct device *dev,
168 struct device_attribute *attr, char *buf)
169{
170 int nid = dev->id;
171 int i;
172 int n = 0;
173
174 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
175 n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
176 node_page_state(nid, i));
177
178 return n;
179}
180static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);
181
182static ssize_t node_read_distance(struct device *dev,
183 struct device_attribute *attr, char *buf)
184{
185 int nid = dev->id;
186 int len = 0;
187 int i;
188
189 /*
190 * buf is currently PAGE_SIZE in length and each node needs 4 chars
191 * at the most (distance + space or newline).
192 */
193 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
194
195 for_each_online_node(i)
196 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
197
198 len += sprintf(buf + len, "\n");
199 return len;
200}
201static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);
202
203static struct attribute *node_dev_attrs[] = {
204 &dev_attr_cpumap.attr,
205 &dev_attr_cpulist.attr,
206 &dev_attr_meminfo.attr,
207 &dev_attr_numastat.attr,
208 &dev_attr_distance.attr,
209 &dev_attr_vmstat.attr,
210 NULL
211};
212ATTRIBUTE_GROUPS(node_dev);
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_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
255static 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 */
280static 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 node->dev.groups = node_dev_groups;
288 error = device_register(&node->dev);
289
290 if (!error){
291 hugetlb_register_node(node);
292
293 compaction_register_node(node);
294 }
295 return error;
296}
297
298/**
299 * unregister_node - unregister a node device
300 * @node: node going away
301 *
302 * Unregisters a node device @node. All the devices on the node must be
303 * unregistered before calling this function.
304 */
305void unregister_node(struct node *node)
306{
307 hugetlb_unregister_node(node); /* no-op, if memoryless node */
308
309 device_unregister(&node->dev);
310}
311
312struct node *node_devices[MAX_NUMNODES];
313
314/*
315 * register cpu under node
316 */
317int register_cpu_under_node(unsigned int cpu, unsigned int nid)
318{
319 int ret;
320 struct device *obj;
321
322 if (!node_online(nid))
323 return 0;
324
325 obj = get_cpu_device(cpu);
326 if (!obj)
327 return 0;
328
329 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
330 &obj->kobj,
331 kobject_name(&obj->kobj));
332 if (ret)
333 return ret;
334
335 return sysfs_create_link(&obj->kobj,
336 &node_devices[nid]->dev.kobj,
337 kobject_name(&node_devices[nid]->dev.kobj));
338}
339
340int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
341{
342 struct device *obj;
343
344 if (!node_online(nid))
345 return 0;
346
347 obj = get_cpu_device(cpu);
348 if (!obj)
349 return 0;
350
351 sysfs_remove_link(&node_devices[nid]->dev.kobj,
352 kobject_name(&obj->kobj));
353 sysfs_remove_link(&obj->kobj,
354 kobject_name(&node_devices[nid]->dev.kobj));
355
356 return 0;
357}
358
359#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
360#define page_initialized(page) (page->lru.next)
361
362static int __init_refok get_nid_for_pfn(unsigned long pfn)
363{
364 struct page *page;
365
366 if (!pfn_valid_within(pfn))
367 return -1;
368#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
369 if (system_state == SYSTEM_BOOTING)
370 return early_pfn_to_nid(pfn);
371#endif
372 page = pfn_to_page(pfn);
373 if (!page_initialized(page))
374 return -1;
375 return pfn_to_nid(pfn);
376}
377
378/* register memory section under specified node if it spans that node */
379int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
380{
381 int ret;
382 unsigned long pfn, sect_start_pfn, sect_end_pfn;
383
384 if (!mem_blk)
385 return -EFAULT;
386 if (!node_online(nid))
387 return 0;
388
389 sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
390 sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
391 sect_end_pfn += PAGES_PER_SECTION - 1;
392 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
393 int page_nid;
394
395 /*
396 * memory block could have several absent sections from start.
397 * skip pfn range from absent section
398 */
399 if (!pfn_present(pfn)) {
400 pfn = round_down(pfn + PAGES_PER_SECTION,
401 PAGES_PER_SECTION) - 1;
402 continue;
403 }
404
405 page_nid = get_nid_for_pfn(pfn);
406 if (page_nid < 0)
407 continue;
408 if (page_nid != nid)
409 continue;
410 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
411 &mem_blk->dev.kobj,
412 kobject_name(&mem_blk->dev.kobj));
413 if (ret)
414 return ret;
415
416 return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
417 &node_devices[nid]->dev.kobj,
418 kobject_name(&node_devices[nid]->dev.kobj));
419 }
420 /* mem section does not span the specified node */
421 return 0;
422}
423
424/* unregister memory section under all nodes that it spans */
425int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
426 unsigned long phys_index)
427{
428 NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
429 unsigned long pfn, sect_start_pfn, sect_end_pfn;
430
431 if (!mem_blk) {
432 NODEMASK_FREE(unlinked_nodes);
433 return -EFAULT;
434 }
435 if (!unlinked_nodes)
436 return -ENOMEM;
437 nodes_clear(*unlinked_nodes);
438
439 sect_start_pfn = section_nr_to_pfn(phys_index);
440 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
441 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
442 int nid;
443
444 nid = get_nid_for_pfn(pfn);
445 if (nid < 0)
446 continue;
447 if (!node_online(nid))
448 continue;
449 if (node_test_and_set(nid, *unlinked_nodes))
450 continue;
451 sysfs_remove_link(&node_devices[nid]->dev.kobj,
452 kobject_name(&mem_blk->dev.kobj));
453 sysfs_remove_link(&mem_blk->dev.kobj,
454 kobject_name(&node_devices[nid]->dev.kobj));
455 }
456 NODEMASK_FREE(unlinked_nodes);
457 return 0;
458}
459
460static int link_mem_sections(int nid)
461{
462 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
463 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
464 unsigned long pfn;
465 struct memory_block *mem_blk = NULL;
466 int err = 0;
467
468 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
469 unsigned long section_nr = pfn_to_section_nr(pfn);
470 struct mem_section *mem_sect;
471 int ret;
472
473 if (!present_section_nr(section_nr))
474 continue;
475 mem_sect = __nr_to_section(section_nr);
476
477 /* same memblock ? */
478 if (mem_blk)
479 if ((section_nr >= mem_blk->start_section_nr) &&
480 (section_nr <= mem_blk->end_section_nr))
481 continue;
482
483 mem_blk = find_memory_block_hinted(mem_sect, mem_blk);
484
485 ret = register_mem_sect_under_node(mem_blk, nid);
486 if (!err)
487 err = ret;
488
489 /* discard ref obtained in find_memory_block() */
490 }
491
492 if (mem_blk)
493 kobject_put(&mem_blk->dev.kobj);
494 return err;
495}
496
497#ifdef CONFIG_HUGETLBFS
498/*
499 * Handle per node hstate attribute [un]registration on transistions
500 * to/from memoryless state.
501 */
502static void node_hugetlb_work(struct work_struct *work)
503{
504 struct node *node = container_of(work, struct node, node_work);
505
506 /*
507 * We only get here when a node transitions to/from memoryless state.
508 * We can detect which transition occurred by examining whether the
509 * node has memory now. hugetlb_register_node() already check this
510 * so we try to register the attributes. If that fails, then the
511 * node has transitioned to memoryless, try to unregister the
512 * attributes.
513 */
514 if (!hugetlb_register_node(node))
515 hugetlb_unregister_node(node);
516}
517
518static void init_node_hugetlb_work(int nid)
519{
520 INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
521}
522
523static int node_memory_callback(struct notifier_block *self,
524 unsigned long action, void *arg)
525{
526 struct memory_notify *mnb = arg;
527 int nid = mnb->status_change_nid;
528
529 switch (action) {
530 case MEM_ONLINE:
531 case MEM_OFFLINE:
532 /*
533 * offload per node hstate [un]registration to a work thread
534 * when transitioning to/from memoryless state.
535 */
536 if (nid != NUMA_NO_NODE)
537 schedule_work(&node_devices[nid]->node_work);
538 break;
539
540 case MEM_GOING_ONLINE:
541 case MEM_GOING_OFFLINE:
542 case MEM_CANCEL_ONLINE:
543 case MEM_CANCEL_OFFLINE:
544 default:
545 break;
546 }
547
548 return NOTIFY_OK;
549}
550#endif /* CONFIG_HUGETLBFS */
551#else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
552
553static int link_mem_sections(int nid) { return 0; }
554#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
555
556#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
557 !defined(CONFIG_HUGETLBFS)
558static inline int node_memory_callback(struct notifier_block *self,
559 unsigned long action, void *arg)
560{
561 return NOTIFY_OK;
562}
563
564static void init_node_hugetlb_work(int nid) { }
565
566#endif
567
568int register_one_node(int nid)
569{
570 int error = 0;
571 int cpu;
572
573 if (node_online(nid)) {
574 int p_node = parent_node(nid);
575 struct node *parent = NULL;
576
577 if (p_node != nid)
578 parent = node_devices[p_node];
579
580 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
581 if (!node_devices[nid])
582 return -ENOMEM;
583
584 error = register_node(node_devices[nid], nid, parent);
585
586 /* link cpu under this node */
587 for_each_present_cpu(cpu) {
588 if (cpu_to_node(cpu) == nid)
589 register_cpu_under_node(cpu, nid);
590 }
591
592 /* link memory sections under this node */
593 error = link_mem_sections(nid);
594
595 /* initialize work queue for memory hot plug */
596 init_node_hugetlb_work(nid);
597 }
598
599 return error;
600
601}
602
603void unregister_one_node(int nid)
604{
605 if (!node_devices[nid])
606 return;
607
608 unregister_node(node_devices[nid]);
609 node_devices[nid] = NULL;
610}
611
612/*
613 * node states attributes
614 */
615
616static ssize_t print_nodes_state(enum node_states state, char *buf)
617{
618 int n;
619
620 n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
621 nodemask_pr_args(&node_states[state]));
622 buf[n++] = '\n';
623 buf[n] = '\0';
624 return n;
625}
626
627struct node_attr {
628 struct device_attribute attr;
629 enum node_states state;
630};
631
632static ssize_t show_node_state(struct device *dev,
633 struct device_attribute *attr, char *buf)
634{
635 struct node_attr *na = container_of(attr, struct node_attr, attr);
636 return print_nodes_state(na->state, buf);
637}
638
639#define _NODE_ATTR(name, state) \
640 { __ATTR(name, 0444, show_node_state, NULL), state }
641
642static struct node_attr node_state_attr[] = {
643 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
644 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
645 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
646#ifdef CONFIG_HIGHMEM
647 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
648#endif
649#ifdef CONFIG_MOVABLE_NODE
650 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
651#endif
652 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
653};
654
655static struct attribute *node_state_attrs[] = {
656 &node_state_attr[N_POSSIBLE].attr.attr,
657 &node_state_attr[N_ONLINE].attr.attr,
658 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
659#ifdef CONFIG_HIGHMEM
660 &node_state_attr[N_HIGH_MEMORY].attr.attr,
661#endif
662#ifdef CONFIG_MOVABLE_NODE
663 &node_state_attr[N_MEMORY].attr.attr,
664#endif
665 &node_state_attr[N_CPU].attr.attr,
666 NULL
667};
668
669static struct attribute_group memory_root_attr_group = {
670 .attrs = node_state_attrs,
671};
672
673static const struct attribute_group *cpu_root_attr_groups[] = {
674 &memory_root_attr_group,
675 NULL,
676};
677
678#define NODE_CALLBACK_PRI 2 /* lower than SLAB */
679static int __init register_node_type(void)
680{
681 int ret;
682
683 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
684 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
685
686 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
687 if (!ret) {
688 static struct notifier_block node_memory_callback_nb = {
689 .notifier_call = node_memory_callback,
690 .priority = NODE_CALLBACK_PRI,
691 };
692 register_hotmemory_notifier(&node_memory_callback_nb);
693 }
694
695 /*
696 * Note: we're not going to unregister the node class if we fail
697 * to register the node state class attribute files.
698 */
699 return ret;
700}
701postcore_initcall(register_node_type);