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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// 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 const struct bus_type node_subsys = {
25 .name = "node",
26 .dev_name = "node",
27};
28
29static inline ssize_t cpumap_read(struct file *file, struct kobject *kobj,
30 struct bin_attribute *attr, char *buf,
31 loff_t off, size_t count)
32{
33 struct device *dev = kobj_to_dev(kobj);
34 struct node *node_dev = to_node(dev);
35 cpumask_var_t mask;
36 ssize_t n;
37
38 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
39 return 0;
40
41 cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
42 n = cpumap_print_bitmask_to_buf(buf, mask, off, count);
43 free_cpumask_var(mask);
44
45 return n;
46}
47
48static BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES);
49
50static inline ssize_t cpulist_read(struct file *file, struct kobject *kobj,
51 struct bin_attribute *attr, char *buf,
52 loff_t off, size_t count)
53{
54 struct device *dev = kobj_to_dev(kobj);
55 struct node *node_dev = to_node(dev);
56 cpumask_var_t mask;
57 ssize_t n;
58
59 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
60 return 0;
61
62 cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
63 n = cpumap_print_list_to_buf(buf, mask, off, count);
64 free_cpumask_var(mask);
65
66 return n;
67}
68
69static BIN_ATTR_RO(cpulist, CPULIST_FILE_MAX_BYTES);
70
71/**
72 * struct node_access_nodes - Access class device to hold user visible
73 * relationships to other nodes.
74 * @dev: Device for this memory access class
75 * @list_node: List element in the node's access list
76 * @access: The access class rank
77 * @coord: Heterogeneous memory performance coordinates
78 */
79struct node_access_nodes {
80 struct device dev;
81 struct list_head list_node;
82 unsigned int access;
83#ifdef CONFIG_HMEM_REPORTING
84 struct access_coordinate coord;
85#endif
86};
87#define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev)
88
89static struct attribute *node_init_access_node_attrs[] = {
90 NULL,
91};
92
93static struct attribute *node_targ_access_node_attrs[] = {
94 NULL,
95};
96
97static const struct attribute_group initiators = {
98 .name = "initiators",
99 .attrs = node_init_access_node_attrs,
100};
101
102static const struct attribute_group targets = {
103 .name = "targets",
104 .attrs = node_targ_access_node_attrs,
105};
106
107static const struct attribute_group *node_access_node_groups[] = {
108 &initiators,
109 &targets,
110 NULL,
111};
112
113static void node_remove_accesses(struct node *node)
114{
115 struct node_access_nodes *c, *cnext;
116
117 list_for_each_entry_safe(c, cnext, &node->access_list, list_node) {
118 list_del(&c->list_node);
119 device_unregister(&c->dev);
120 }
121}
122
123static void node_access_release(struct device *dev)
124{
125 kfree(to_access_nodes(dev));
126}
127
128static struct node_access_nodes *node_init_node_access(struct node *node,
129 enum access_coordinate_class access)
130{
131 struct node_access_nodes *access_node;
132 struct device *dev;
133
134 list_for_each_entry(access_node, &node->access_list, list_node)
135 if (access_node->access == access)
136 return access_node;
137
138 access_node = kzalloc(sizeof(*access_node), GFP_KERNEL);
139 if (!access_node)
140 return NULL;
141
142 access_node->access = access;
143 dev = &access_node->dev;
144 dev->parent = &node->dev;
145 dev->release = node_access_release;
146 dev->groups = node_access_node_groups;
147 if (dev_set_name(dev, "access%u", access))
148 goto free;
149
150 if (device_register(dev))
151 goto free_name;
152
153 pm_runtime_no_callbacks(dev);
154 list_add_tail(&access_node->list_node, &node->access_list);
155 return access_node;
156free_name:
157 kfree_const(dev->kobj.name);
158free:
159 kfree(access_node);
160 return NULL;
161}
162
163#ifdef CONFIG_HMEM_REPORTING
164#define ACCESS_ATTR(property) \
165static ssize_t property##_show(struct device *dev, \
166 struct device_attribute *attr, \
167 char *buf) \
168{ \
169 return sysfs_emit(buf, "%u\n", \
170 to_access_nodes(dev)->coord.property); \
171} \
172static DEVICE_ATTR_RO(property)
173
174ACCESS_ATTR(read_bandwidth);
175ACCESS_ATTR(read_latency);
176ACCESS_ATTR(write_bandwidth);
177ACCESS_ATTR(write_latency);
178
179static struct attribute *access_attrs[] = {
180 &dev_attr_read_bandwidth.attr,
181 &dev_attr_read_latency.attr,
182 &dev_attr_write_bandwidth.attr,
183 &dev_attr_write_latency.attr,
184 NULL,
185};
186
187/**
188 * node_set_perf_attrs - Set the performance values for given access class
189 * @nid: Node identifier to be set
190 * @coord: Heterogeneous memory performance coordinates
191 * @access: The access class the for the given attributes
192 */
193void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
194 enum access_coordinate_class access)
195{
196 struct node_access_nodes *c;
197 struct node *node;
198 int i;
199
200 if (WARN_ON_ONCE(!node_online(nid)))
201 return;
202
203 node = node_devices[nid];
204 c = node_init_node_access(node, access);
205 if (!c)
206 return;
207
208 c->coord = *coord;
209 for (i = 0; access_attrs[i] != NULL; i++) {
210 if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i],
211 "initiators")) {
212 pr_info("failed to add performance attribute to node %d\n",
213 nid);
214 break;
215 }
216 }
217}
218EXPORT_SYMBOL_GPL(node_set_perf_attrs);
219
220/**
221 * struct node_cache_info - Internal tracking for memory node caches
222 * @dev: Device represeting the cache level
223 * @node: List element for tracking in the node
224 * @cache_attrs:Attributes for this cache level
225 */
226struct node_cache_info {
227 struct device dev;
228 struct list_head node;
229 struct node_cache_attrs cache_attrs;
230};
231#define to_cache_info(device) container_of(device, struct node_cache_info, dev)
232
233#define CACHE_ATTR(name, fmt) \
234static ssize_t name##_show(struct device *dev, \
235 struct device_attribute *attr, \
236 char *buf) \
237{ \
238 return sysfs_emit(buf, fmt "\n", \
239 to_cache_info(dev)->cache_attrs.name); \
240} \
241static DEVICE_ATTR_RO(name);
242
243CACHE_ATTR(size, "%llu")
244CACHE_ATTR(line_size, "%u")
245CACHE_ATTR(indexing, "%u")
246CACHE_ATTR(write_policy, "%u")
247
248static struct attribute *cache_attrs[] = {
249 &dev_attr_indexing.attr,
250 &dev_attr_size.attr,
251 &dev_attr_line_size.attr,
252 &dev_attr_write_policy.attr,
253 NULL,
254};
255ATTRIBUTE_GROUPS(cache);
256
257static void node_cache_release(struct device *dev)
258{
259 kfree(dev);
260}
261
262static void node_cacheinfo_release(struct device *dev)
263{
264 struct node_cache_info *info = to_cache_info(dev);
265 kfree(info);
266}
267
268static void node_init_cache_dev(struct node *node)
269{
270 struct device *dev;
271
272 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
273 if (!dev)
274 return;
275
276 device_initialize(dev);
277 dev->parent = &node->dev;
278 dev->release = node_cache_release;
279 if (dev_set_name(dev, "memory_side_cache"))
280 goto put_device;
281
282 if (device_add(dev))
283 goto put_device;
284
285 pm_runtime_no_callbacks(dev);
286 node->cache_dev = dev;
287 return;
288put_device:
289 put_device(dev);
290}
291
292/**
293 * node_add_cache() - add cache attribute to a memory node
294 * @nid: Node identifier that has new cache attributes
295 * @cache_attrs: Attributes for the cache being added
296 */
297void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs)
298{
299 struct node_cache_info *info;
300 struct device *dev;
301 struct node *node;
302
303 if (!node_online(nid) || !node_devices[nid])
304 return;
305
306 node = node_devices[nid];
307 list_for_each_entry(info, &node->cache_attrs, node) {
308 if (info->cache_attrs.level == cache_attrs->level) {
309 dev_warn(&node->dev,
310 "attempt to add duplicate cache level:%d\n",
311 cache_attrs->level);
312 return;
313 }
314 }
315
316 if (!node->cache_dev)
317 node_init_cache_dev(node);
318 if (!node->cache_dev)
319 return;
320
321 info = kzalloc(sizeof(*info), GFP_KERNEL);
322 if (!info)
323 return;
324
325 dev = &info->dev;
326 device_initialize(dev);
327 dev->parent = node->cache_dev;
328 dev->release = node_cacheinfo_release;
329 dev->groups = cache_groups;
330 if (dev_set_name(dev, "index%d", cache_attrs->level))
331 goto put_device;
332
333 info->cache_attrs = *cache_attrs;
334 if (device_add(dev)) {
335 dev_warn(&node->dev, "failed to add cache level:%d\n",
336 cache_attrs->level);
337 goto put_device;
338 }
339 pm_runtime_no_callbacks(dev);
340 list_add_tail(&info->node, &node->cache_attrs);
341 return;
342put_device:
343 put_device(dev);
344}
345
346static void node_remove_caches(struct node *node)
347{
348 struct node_cache_info *info, *next;
349
350 if (!node->cache_dev)
351 return;
352
353 list_for_each_entry_safe(info, next, &node->cache_attrs, node) {
354 list_del(&info->node);
355 device_unregister(&info->dev);
356 }
357 device_unregister(node->cache_dev);
358}
359
360static void node_init_caches(unsigned int nid)
361{
362 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);
363}
364#else
365static void node_init_caches(unsigned int nid) { }
366static void node_remove_caches(struct node *node) { }
367#endif
368
369#define K(x) ((x) << (PAGE_SHIFT - 10))
370static ssize_t node_read_meminfo(struct device *dev,
371 struct device_attribute *attr, char *buf)
372{
373 int len = 0;
374 int nid = dev->id;
375 struct pglist_data *pgdat = NODE_DATA(nid);
376 struct sysinfo i;
377 unsigned long sreclaimable, sunreclaimable;
378 unsigned long swapcached = 0;
379
380 si_meminfo_node(&i, nid);
381 sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B);
382 sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B);
383#ifdef CONFIG_SWAP
384 swapcached = node_page_state_pages(pgdat, NR_SWAPCACHE);
385#endif
386 len = sysfs_emit_at(buf, len,
387 "Node %d MemTotal: %8lu kB\n"
388 "Node %d MemFree: %8lu kB\n"
389 "Node %d MemUsed: %8lu kB\n"
390 "Node %d SwapCached: %8lu kB\n"
391 "Node %d Active: %8lu kB\n"
392 "Node %d Inactive: %8lu kB\n"
393 "Node %d Active(anon): %8lu kB\n"
394 "Node %d Inactive(anon): %8lu kB\n"
395 "Node %d Active(file): %8lu kB\n"
396 "Node %d Inactive(file): %8lu kB\n"
397 "Node %d Unevictable: %8lu kB\n"
398 "Node %d Mlocked: %8lu kB\n",
399 nid, K(i.totalram),
400 nid, K(i.freeram),
401 nid, K(i.totalram - i.freeram),
402 nid, K(swapcached),
403 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) +
404 node_page_state(pgdat, NR_ACTIVE_FILE)),
405 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) +
406 node_page_state(pgdat, NR_INACTIVE_FILE)),
407 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)),
408 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)),
409 nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)),
410 nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)),
411 nid, K(node_page_state(pgdat, NR_UNEVICTABLE)),
412 nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
413
414#ifdef CONFIG_HIGHMEM
415 len += sysfs_emit_at(buf, len,
416 "Node %d HighTotal: %8lu kB\n"
417 "Node %d HighFree: %8lu kB\n"
418 "Node %d LowTotal: %8lu kB\n"
419 "Node %d LowFree: %8lu kB\n",
420 nid, K(i.totalhigh),
421 nid, K(i.freehigh),
422 nid, K(i.totalram - i.totalhigh),
423 nid, K(i.freeram - i.freehigh));
424#endif
425 len += sysfs_emit_at(buf, len,
426 "Node %d Dirty: %8lu kB\n"
427 "Node %d Writeback: %8lu kB\n"
428 "Node %d FilePages: %8lu kB\n"
429 "Node %d Mapped: %8lu kB\n"
430 "Node %d AnonPages: %8lu kB\n"
431 "Node %d Shmem: %8lu kB\n"
432 "Node %d KernelStack: %8lu kB\n"
433#ifdef CONFIG_SHADOW_CALL_STACK
434 "Node %d ShadowCallStack:%8lu kB\n"
435#endif
436 "Node %d PageTables: %8lu kB\n"
437 "Node %d SecPageTables: %8lu kB\n"
438 "Node %d NFS_Unstable: %8lu kB\n"
439 "Node %d Bounce: %8lu kB\n"
440 "Node %d WritebackTmp: %8lu kB\n"
441 "Node %d KReclaimable: %8lu kB\n"
442 "Node %d Slab: %8lu kB\n"
443 "Node %d SReclaimable: %8lu kB\n"
444 "Node %d SUnreclaim: %8lu kB\n"
445#ifdef CONFIG_TRANSPARENT_HUGEPAGE
446 "Node %d AnonHugePages: %8lu kB\n"
447 "Node %d ShmemHugePages: %8lu kB\n"
448 "Node %d ShmemPmdMapped: %8lu kB\n"
449 "Node %d FileHugePages: %8lu kB\n"
450 "Node %d FilePmdMapped: %8lu kB\n"
451#endif
452#ifdef CONFIG_UNACCEPTED_MEMORY
453 "Node %d Unaccepted: %8lu kB\n"
454#endif
455 ,
456 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
457 nid, K(node_page_state(pgdat, NR_WRITEBACK)),
458 nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
459 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
460 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
461 nid, K(i.sharedram),
462 nid, node_page_state(pgdat, NR_KERNEL_STACK_KB),
463#ifdef CONFIG_SHADOW_CALL_STACK
464 nid, node_page_state(pgdat, NR_KERNEL_SCS_KB),
465#endif
466 nid, K(node_page_state(pgdat, NR_PAGETABLE)),
467 nid, K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)),
468 nid, 0UL,
469 nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
470 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
471 nid, K(sreclaimable +
472 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
473 nid, K(sreclaimable + sunreclaimable),
474 nid, K(sreclaimable),
475 nid, K(sunreclaimable)
476#ifdef CONFIG_TRANSPARENT_HUGEPAGE
477 ,
478 nid, K(node_page_state(pgdat, NR_ANON_THPS)),
479 nid, K(node_page_state(pgdat, NR_SHMEM_THPS)),
480 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)),
481 nid, K(node_page_state(pgdat, NR_FILE_THPS)),
482 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED))
483#endif
484#ifdef CONFIG_UNACCEPTED_MEMORY
485 ,
486 nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED))
487#endif
488 );
489 len += hugetlb_report_node_meminfo(buf, len, nid);
490 return len;
491}
492
493#undef K
494static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL);
495
496static ssize_t node_read_numastat(struct device *dev,
497 struct device_attribute *attr, char *buf)
498{
499 fold_vm_numa_events();
500 return sysfs_emit(buf,
501 "numa_hit %lu\n"
502 "numa_miss %lu\n"
503 "numa_foreign %lu\n"
504 "interleave_hit %lu\n"
505 "local_node %lu\n"
506 "other_node %lu\n",
507 sum_zone_numa_event_state(dev->id, NUMA_HIT),
508 sum_zone_numa_event_state(dev->id, NUMA_MISS),
509 sum_zone_numa_event_state(dev->id, NUMA_FOREIGN),
510 sum_zone_numa_event_state(dev->id, NUMA_INTERLEAVE_HIT),
511 sum_zone_numa_event_state(dev->id, NUMA_LOCAL),
512 sum_zone_numa_event_state(dev->id, NUMA_OTHER));
513}
514static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL);
515
516static ssize_t node_read_vmstat(struct device *dev,
517 struct device_attribute *attr, char *buf)
518{
519 int nid = dev->id;
520 struct pglist_data *pgdat = NODE_DATA(nid);
521 int i;
522 int len = 0;
523
524 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
525 len += sysfs_emit_at(buf, len, "%s %lu\n",
526 zone_stat_name(i),
527 sum_zone_node_page_state(nid, i));
528
529#ifdef CONFIG_NUMA
530 fold_vm_numa_events();
531 for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++)
532 len += sysfs_emit_at(buf, len, "%s %lu\n",
533 numa_stat_name(i),
534 sum_zone_numa_event_state(nid, i));
535
536#endif
537 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
538 unsigned long pages = node_page_state_pages(pgdat, i);
539
540 if (vmstat_item_print_in_thp(i))
541 pages /= HPAGE_PMD_NR;
542 len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i),
543 pages);
544 }
545
546 return len;
547}
548static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL);
549
550static ssize_t node_read_distance(struct device *dev,
551 struct device_attribute *attr, char *buf)
552{
553 int nid = dev->id;
554 int len = 0;
555 int i;
556
557 /*
558 * buf is currently PAGE_SIZE in length and each node needs 4 chars
559 * at the most (distance + space or newline).
560 */
561 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
562
563 for_each_online_node(i) {
564 len += sysfs_emit_at(buf, len, "%s%d",
565 i ? " " : "", node_distance(nid, i));
566 }
567
568 len += sysfs_emit_at(buf, len, "\n");
569 return len;
570}
571static DEVICE_ATTR(distance, 0444, node_read_distance, NULL);
572
573static struct attribute *node_dev_attrs[] = {
574 &dev_attr_meminfo.attr,
575 &dev_attr_numastat.attr,
576 &dev_attr_distance.attr,
577 &dev_attr_vmstat.attr,
578 NULL
579};
580
581static struct bin_attribute *node_dev_bin_attrs[] = {
582 &bin_attr_cpumap,
583 &bin_attr_cpulist,
584 NULL
585};
586
587static const struct attribute_group node_dev_group = {
588 .attrs = node_dev_attrs,
589 .bin_attrs = node_dev_bin_attrs
590};
591
592static const struct attribute_group *node_dev_groups[] = {
593 &node_dev_group,
594#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
595 &arch_node_dev_group,
596#endif
597#ifdef CONFIG_MEMORY_FAILURE
598 &memory_failure_attr_group,
599#endif
600 NULL
601};
602
603static void node_device_release(struct device *dev)
604{
605 kfree(to_node(dev));
606}
607
608/*
609 * register_node - Setup a sysfs device for a node.
610 * @num - Node number to use when creating the device.
611 *
612 * Initialize and register the node device.
613 */
614static int register_node(struct node *node, int num)
615{
616 int error;
617
618 node->dev.id = num;
619 node->dev.bus = &node_subsys;
620 node->dev.release = node_device_release;
621 node->dev.groups = node_dev_groups;
622 error = device_register(&node->dev);
623
624 if (error) {
625 put_device(&node->dev);
626 } else {
627 hugetlb_register_node(node);
628 compaction_register_node(node);
629 }
630
631 return error;
632}
633
634/**
635 * unregister_node - unregister a node device
636 * @node: node going away
637 *
638 * Unregisters a node device @node. All the devices on the node must be
639 * unregistered before calling this function.
640 */
641void unregister_node(struct node *node)
642{
643 hugetlb_unregister_node(node);
644 compaction_unregister_node(node);
645 node_remove_accesses(node);
646 node_remove_caches(node);
647 device_unregister(&node->dev);
648}
649
650struct node *node_devices[MAX_NUMNODES];
651
652/*
653 * register cpu under node
654 */
655int register_cpu_under_node(unsigned int cpu, unsigned int nid)
656{
657 int ret;
658 struct device *obj;
659
660 if (!node_online(nid))
661 return 0;
662
663 obj = get_cpu_device(cpu);
664 if (!obj)
665 return 0;
666
667 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
668 &obj->kobj,
669 kobject_name(&obj->kobj));
670 if (ret)
671 return ret;
672
673 return sysfs_create_link(&obj->kobj,
674 &node_devices[nid]->dev.kobj,
675 kobject_name(&node_devices[nid]->dev.kobj));
676}
677
678/**
679 * register_memory_node_under_compute_node - link memory node to its compute
680 * node for a given access class.
681 * @mem_nid: Memory node number
682 * @cpu_nid: Cpu node number
683 * @access: Access class to register
684 *
685 * Description:
686 * For use with platforms that may have separate memory and compute nodes.
687 * This function will export node relationships linking which memory
688 * initiator nodes can access memory targets at a given ranked access
689 * class.
690 */
691int register_memory_node_under_compute_node(unsigned int mem_nid,
692 unsigned int cpu_nid,
693 enum access_coordinate_class access)
694{
695 struct node *init_node, *targ_node;
696 struct node_access_nodes *initiator, *target;
697 int ret;
698
699 if (!node_online(cpu_nid) || !node_online(mem_nid))
700 return -ENODEV;
701
702 init_node = node_devices[cpu_nid];
703 targ_node = node_devices[mem_nid];
704 initiator = node_init_node_access(init_node, access);
705 target = node_init_node_access(targ_node, access);
706 if (!initiator || !target)
707 return -ENOMEM;
708
709 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets",
710 &targ_node->dev.kobj,
711 dev_name(&targ_node->dev));
712 if (ret)
713 return ret;
714
715 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators",
716 &init_node->dev.kobj,
717 dev_name(&init_node->dev));
718 if (ret)
719 goto err;
720
721 return 0;
722 err:
723 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets",
724 dev_name(&targ_node->dev));
725 return ret;
726}
727
728int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
729{
730 struct device *obj;
731
732 if (!node_online(nid))
733 return 0;
734
735 obj = get_cpu_device(cpu);
736 if (!obj)
737 return 0;
738
739 sysfs_remove_link(&node_devices[nid]->dev.kobj,
740 kobject_name(&obj->kobj));
741 sysfs_remove_link(&obj->kobj,
742 kobject_name(&node_devices[nid]->dev.kobj));
743
744 return 0;
745}
746
747#ifdef CONFIG_MEMORY_HOTPLUG
748static int __ref get_nid_for_pfn(unsigned long pfn)
749{
750#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
751 if (system_state < SYSTEM_RUNNING)
752 return early_pfn_to_nid(pfn);
753#endif
754 return pfn_to_nid(pfn);
755}
756
757static void do_register_memory_block_under_node(int nid,
758 struct memory_block *mem_blk,
759 enum meminit_context context)
760{
761 int ret;
762
763 memory_block_add_nid(mem_blk, nid, context);
764
765 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
766 &mem_blk->dev.kobj,
767 kobject_name(&mem_blk->dev.kobj));
768 if (ret && ret != -EEXIST)
769 dev_err_ratelimited(&node_devices[nid]->dev,
770 "can't create link to %s in sysfs (%d)\n",
771 kobject_name(&mem_blk->dev.kobj), ret);
772
773 ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj,
774 &node_devices[nid]->dev.kobj,
775 kobject_name(&node_devices[nid]->dev.kobj));
776 if (ret && ret != -EEXIST)
777 dev_err_ratelimited(&mem_blk->dev,
778 "can't create link to %s in sysfs (%d)\n",
779 kobject_name(&node_devices[nid]->dev.kobj),
780 ret);
781}
782
783/* register memory section under specified node if it spans that node */
784static int register_mem_block_under_node_early(struct memory_block *mem_blk,
785 void *arg)
786{
787 unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
788 unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
789 unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
790 int nid = *(int *)arg;
791 unsigned long pfn;
792
793 for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
794 int page_nid;
795
796 /*
797 * memory block could have several absent sections from start.
798 * skip pfn range from absent section
799 */
800 if (!pfn_in_present_section(pfn)) {
801 pfn = round_down(pfn + PAGES_PER_SECTION,
802 PAGES_PER_SECTION) - 1;
803 continue;
804 }
805
806 /*
807 * We need to check if page belongs to nid only at the boot
808 * case because node's ranges can be interleaved.
809 */
810 page_nid = get_nid_for_pfn(pfn);
811 if (page_nid < 0)
812 continue;
813 if (page_nid != nid)
814 continue;
815
816 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_EARLY);
817 return 0;
818 }
819 /* mem section does not span the specified node */
820 return 0;
821}
822
823/*
824 * During hotplug we know that all pages in the memory block belong to the same
825 * node.
826 */
827static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk,
828 void *arg)
829{
830 int nid = *(int *)arg;
831
832 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_HOTPLUG);
833 return 0;
834}
835
836/*
837 * Unregister a memory block device under the node it spans. Memory blocks
838 * with multiple nodes cannot be offlined and therefore also never be removed.
839 */
840void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
841{
842 if (mem_blk->nid == NUMA_NO_NODE)
843 return;
844
845 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj,
846 kobject_name(&mem_blk->dev.kobj));
847 sysfs_remove_link(&mem_blk->dev.kobj,
848 kobject_name(&node_devices[mem_blk->nid]->dev.kobj));
849}
850
851void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
852 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 walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
863 (void *)&nid, func);
864 return;
865}
866#endif /* CONFIG_MEMORY_HOTPLUG */
867
868int __register_one_node(int nid)
869{
870 int error;
871 int cpu;
872 struct node *node;
873
874 node = kzalloc(sizeof(struct node), GFP_KERNEL);
875 if (!node)
876 return -ENOMEM;
877
878 INIT_LIST_HEAD(&node->access_list);
879 node_devices[nid] = node;
880
881 error = register_node(node_devices[nid], nid);
882
883 /* link cpu under this node */
884 for_each_present_cpu(cpu) {
885 if (cpu_to_node(cpu) == nid)
886 register_cpu_under_node(cpu, nid);
887 }
888
889 node_init_caches(nid);
890
891 return error;
892}
893
894void unregister_one_node(int nid)
895{
896 if (!node_devices[nid])
897 return;
898
899 unregister_node(node_devices[nid]);
900 node_devices[nid] = NULL;
901}
902
903/*
904 * node states attributes
905 */
906
907struct node_attr {
908 struct device_attribute attr;
909 enum node_states state;
910};
911
912static ssize_t show_node_state(struct device *dev,
913 struct device_attribute *attr, char *buf)
914{
915 struct node_attr *na = container_of(attr, struct node_attr, attr);
916
917 return sysfs_emit(buf, "%*pbl\n",
918 nodemask_pr_args(&node_states[na->state]));
919}
920
921#define _NODE_ATTR(name, state) \
922 { __ATTR(name, 0444, show_node_state, NULL), state }
923
924static struct node_attr node_state_attr[] = {
925 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
926 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
927 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
928#ifdef CONFIG_HIGHMEM
929 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
930#endif
931 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
932 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
933 [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator,
934 N_GENERIC_INITIATOR),
935};
936
937static struct attribute *node_state_attrs[] = {
938 &node_state_attr[N_POSSIBLE].attr.attr,
939 &node_state_attr[N_ONLINE].attr.attr,
940 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
941#ifdef CONFIG_HIGHMEM
942 &node_state_attr[N_HIGH_MEMORY].attr.attr,
943#endif
944 &node_state_attr[N_MEMORY].attr.attr,
945 &node_state_attr[N_CPU].attr.attr,
946 &node_state_attr[N_GENERIC_INITIATOR].attr.attr,
947 NULL
948};
949
950static const struct attribute_group memory_root_attr_group = {
951 .attrs = node_state_attrs,
952};
953
954static const struct attribute_group *cpu_root_attr_groups[] = {
955 &memory_root_attr_group,
956 NULL,
957};
958
959void __init node_dev_init(void)
960{
961 int ret, i;
962
963 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
964 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
965
966 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
967 if (ret)
968 panic("%s() failed to register subsystem: %d\n", __func__, ret);
969
970 /*
971 * Create all node devices, which will properly link the node
972 * to applicable memory block devices and already created cpu devices.
973 */
974 for_each_online_node(i) {
975 ret = register_one_node(i);
976 if (ret)
977 panic("%s() failed to add node: %d\n", __func__, ret);
978 }
979}