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Merge tag 'mm-hotfixes-stable-2025-07-11-16-16' of git://git.kernel.org/pub/scm/linux...
[linux-block.git] / drivers / base / node.c
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CommitLineData
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/mempolicy.h>
11#include <linux/vmstat.h>
12#include <linux/notifier.h>
13#include <linux/node.h>
14#include <linux/hugetlb.h>
15#include <linux/compaction.h>
16#include <linux/cpumask.h>
17#include <linux/topology.h>
18#include <linux/nodemask.h>
19#include <linux/cpu.h>
20#include <linux/device.h>
21#include <linux/pm_runtime.h>
22#include <linux/swap.h>
23#include <linux/slab.h>
24
25static const struct bus_type node_subsys = {
26 .name = "node",
27 .dev_name = "node",
28};
29
30static inline ssize_t cpumap_read(struct file *file, struct kobject *kobj,
31 const struct bin_attribute *attr, char *buf,
32 loff_t off, size_t count)
33{
34 struct device *dev = kobj_to_dev(kobj);
35 struct node *node_dev = to_node(dev);
36 cpumask_var_t mask;
37 ssize_t n;
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_bitmask_to_buf(buf, mask, off, count);
44 free_cpumask_var(mask);
45
46 return n;
47}
48
49static const BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES);
50
51static inline ssize_t cpulist_read(struct file *file, struct kobject *kobj,
52 const struct bin_attribute *attr, char *buf,
53 loff_t off, size_t count)
54{
55 struct device *dev = kobj_to_dev(kobj);
56 struct node *node_dev = to_node(dev);
57 cpumask_var_t mask;
58 ssize_t n;
59
60 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
61 return 0;
62
63 cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
64 n = cpumap_print_list_to_buf(buf, mask, off, count);
65 free_cpumask_var(mask);
66
67 return n;
68}
69
70static const BIN_ATTR_RO(cpulist, CPULIST_FILE_MAX_BYTES);
71
72/**
73 * struct node_access_nodes - Access class device to hold user visible
74 * relationships to other nodes.
75 * @dev: Device for this memory access class
76 * @list_node: List element in the node's access list
77 * @access: The access class rank
78 * @coord: Heterogeneous memory performance coordinates
79 */
80struct node_access_nodes {
81 struct device dev;
82 struct list_head list_node;
83 unsigned int access;
84#ifdef CONFIG_HMEM_REPORTING
85 struct access_coordinate coord;
86#endif
87};
88#define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev)
89
90static struct attribute *node_init_access_node_attrs[] = {
91 NULL,
92};
93
94static struct attribute *node_targ_access_node_attrs[] = {
95 NULL,
96};
97
98static const struct attribute_group initiators = {
99 .name = "initiators",
100 .attrs = node_init_access_node_attrs,
101};
102
103static const struct attribute_group targets = {
104 .name = "targets",
105 .attrs = node_targ_access_node_attrs,
106};
107
108static const struct attribute_group *node_access_node_groups[] = {
109 &initiators,
110 &targets,
111 NULL,
112};
113
114static void node_remove_accesses(struct node *node)
115{
116 struct node_access_nodes *c, *cnext;
117
118 list_for_each_entry_safe(c, cnext, &node->access_list, list_node) {
119 list_del(&c->list_node);
120 device_unregister(&c->dev);
121 }
122}
123
124static void node_access_release(struct device *dev)
125{
126 kfree(to_access_nodes(dev));
127}
128
129static struct node_access_nodes *node_init_node_access(struct node *node,
130 enum access_coordinate_class access)
131{
132 struct node_access_nodes *access_node;
133 struct device *dev;
134
135 list_for_each_entry(access_node, &node->access_list, list_node)
136 if (access_node->access == access)
137 return access_node;
138
139 access_node = kzalloc(sizeof(*access_node), GFP_KERNEL);
140 if (!access_node)
141 return NULL;
142
143 access_node->access = access;
144 dev = &access_node->dev;
145 dev->parent = &node->dev;
146 dev->release = node_access_release;
147 dev->groups = node_access_node_groups;
148 if (dev_set_name(dev, "access%u", access))
149 goto free;
150
151 if (device_register(dev))
152 goto free_name;
153
154 pm_runtime_no_callbacks(dev);
155 list_add_tail(&access_node->list_node, &node->access_list);
156 return access_node;
157free_name:
158 kfree_const(dev->kobj.name);
159free:
160 kfree(access_node);
161 return NULL;
162}
163
164#ifdef CONFIG_HMEM_REPORTING
165#define ACCESS_ATTR(property) \
166static ssize_t property##_show(struct device *dev, \
167 struct device_attribute *attr, \
168 char *buf) \
169{ \
170 return sysfs_emit(buf, "%u\n", \
171 to_access_nodes(dev)->coord.property); \
172} \
173static DEVICE_ATTR_RO(property)
174
175ACCESS_ATTR(read_bandwidth);
176ACCESS_ATTR(read_latency);
177ACCESS_ATTR(write_bandwidth);
178ACCESS_ATTR(write_latency);
179
180static struct attribute *access_attrs[] = {
181 &dev_attr_read_bandwidth.attr,
182 &dev_attr_read_latency.attr,
183 &dev_attr_write_bandwidth.attr,
184 &dev_attr_write_latency.attr,
185 NULL,
186};
187
188/**
189 * node_set_perf_attrs - Set the performance values for given access class
190 * @nid: Node identifier to be set
191 * @coord: Heterogeneous memory performance coordinates
192 * @access: The access class the for the given attributes
193 */
194void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
195 enum access_coordinate_class access)
196{
197 struct node_access_nodes *c;
198 struct node *node;
199 int i;
200
201 if (WARN_ON_ONCE(!node_online(nid)))
202 return;
203
204 node = node_devices[nid];
205 c = node_init_node_access(node, access);
206 if (!c)
207 return;
208
209 c->coord = *coord;
210 for (i = 0; access_attrs[i] != NULL; i++) {
211 if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i],
212 "initiators")) {
213 pr_info("failed to add performance attribute to node %d\n",
214 nid);
215 break;
216 }
217 }
218
219 /* When setting CPU access coordinates, update mempolicy */
220 if (access == ACCESS_COORDINATE_CPU) {
221 if (mempolicy_set_node_perf(nid, coord)) {
222 pr_info("failed to set mempolicy attrs for node %d\n",
223 nid);
224 }
225 }
226}
227EXPORT_SYMBOL_GPL(node_set_perf_attrs);
228
229/**
230 * struct node_cache_info - Internal tracking for memory node caches
231 * @dev: Device represeting the cache level
232 * @node: List element for tracking in the node
233 * @cache_attrs:Attributes for this cache level
234 */
235struct node_cache_info {
236 struct device dev;
237 struct list_head node;
238 struct node_cache_attrs cache_attrs;
239};
240#define to_cache_info(device) container_of(device, struct node_cache_info, dev)
241
242#define CACHE_ATTR(name, fmt) \
243static ssize_t name##_show(struct device *dev, \
244 struct device_attribute *attr, \
245 char *buf) \
246{ \
247 return sysfs_emit(buf, fmt "\n", \
248 to_cache_info(dev)->cache_attrs.name); \
249} \
250static DEVICE_ATTR_RO(name);
251
252CACHE_ATTR(size, "%llu")
253CACHE_ATTR(line_size, "%u")
254CACHE_ATTR(indexing, "%u")
255CACHE_ATTR(write_policy, "%u")
256CACHE_ATTR(address_mode, "%#x")
257
258static struct attribute *cache_attrs[] = {
259 &dev_attr_indexing.attr,
260 &dev_attr_size.attr,
261 &dev_attr_line_size.attr,
262 &dev_attr_write_policy.attr,
263 &dev_attr_address_mode.attr,
264 NULL,
265};
266ATTRIBUTE_GROUPS(cache);
267
268static void node_cache_release(struct device *dev)
269{
270 kfree(dev);
271}
272
273static void node_cacheinfo_release(struct device *dev)
274{
275 struct node_cache_info *info = to_cache_info(dev);
276 kfree(info);
277}
278
279static void node_init_cache_dev(struct node *node)
280{
281 struct device *dev;
282
283 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
284 if (!dev)
285 return;
286
287 device_initialize(dev);
288 dev->parent = &node->dev;
289 dev->release = node_cache_release;
290 if (dev_set_name(dev, "memory_side_cache"))
291 goto put_device;
292
293 if (device_add(dev))
294 goto put_device;
295
296 pm_runtime_no_callbacks(dev);
297 node->cache_dev = dev;
298 return;
299put_device:
300 put_device(dev);
301}
302
303/**
304 * node_add_cache() - add cache attribute to a memory node
305 * @nid: Node identifier that has new cache attributes
306 * @cache_attrs: Attributes for the cache being added
307 */
308void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs)
309{
310 struct node_cache_info *info;
311 struct device *dev;
312 struct node *node;
313
314 if (!node_online(nid) || !node_devices[nid])
315 return;
316
317 node = node_devices[nid];
318 list_for_each_entry(info, &node->cache_attrs, node) {
319 if (info->cache_attrs.level == cache_attrs->level) {
320 dev_warn(&node->dev,
321 "attempt to add duplicate cache level:%d\n",
322 cache_attrs->level);
323 return;
324 }
325 }
326
327 if (!node->cache_dev)
328 node_init_cache_dev(node);
329 if (!node->cache_dev)
330 return;
331
332 info = kzalloc(sizeof(*info), GFP_KERNEL);
333 if (!info)
334 return;
335
336 dev = &info->dev;
337 device_initialize(dev);
338 dev->parent = node->cache_dev;
339 dev->release = node_cacheinfo_release;
340 dev->groups = cache_groups;
341 if (dev_set_name(dev, "index%d", cache_attrs->level))
342 goto put_device;
343
344 info->cache_attrs = *cache_attrs;
345 if (device_add(dev)) {
346 dev_warn(&node->dev, "failed to add cache level:%d\n",
347 cache_attrs->level);
348 goto put_device;
349 }
350 pm_runtime_no_callbacks(dev);
351 list_add_tail(&info->node, &node->cache_attrs);
352 return;
353put_device:
354 put_device(dev);
355}
356
357static void node_remove_caches(struct node *node)
358{
359 struct node_cache_info *info, *next;
360
361 if (!node->cache_dev)
362 return;
363
364 list_for_each_entry_safe(info, next, &node->cache_attrs, node) {
365 list_del(&info->node);
366 device_unregister(&info->dev);
367 }
368 device_unregister(node->cache_dev);
369}
370
371static void node_init_caches(unsigned int nid)
372{
373 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);
374}
375#else
376static void node_init_caches(unsigned int nid) { }
377static void node_remove_caches(struct node *node) { }
378#endif
379
380#define K(x) ((x) << (PAGE_SHIFT - 10))
381static ssize_t node_read_meminfo(struct device *dev,
382 struct device_attribute *attr, char *buf)
383{
384 int len = 0;
385 int nid = dev->id;
386 struct pglist_data *pgdat = NODE_DATA(nid);
387 struct sysinfo i;
388 unsigned long sreclaimable, sunreclaimable;
389 unsigned long swapcached = 0;
390
391 si_meminfo_node(&i, nid);
392 sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B);
393 sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B);
394#ifdef CONFIG_SWAP
395 swapcached = node_page_state_pages(pgdat, NR_SWAPCACHE);
396#endif
397 len = sysfs_emit_at(buf, len,
398 "Node %d MemTotal: %8lu kB\n"
399 "Node %d MemFree: %8lu kB\n"
400 "Node %d MemUsed: %8lu kB\n"
401 "Node %d SwapCached: %8lu kB\n"
402 "Node %d Active: %8lu kB\n"
403 "Node %d Inactive: %8lu kB\n"
404 "Node %d Active(anon): %8lu kB\n"
405 "Node %d Inactive(anon): %8lu kB\n"
406 "Node %d Active(file): %8lu kB\n"
407 "Node %d Inactive(file): %8lu kB\n"
408 "Node %d Unevictable: %8lu kB\n"
409 "Node %d Mlocked: %8lu kB\n",
410 nid, K(i.totalram),
411 nid, K(i.freeram),
412 nid, K(i.totalram - i.freeram),
413 nid, K(swapcached),
414 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) +
415 node_page_state(pgdat, NR_ACTIVE_FILE)),
416 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) +
417 node_page_state(pgdat, NR_INACTIVE_FILE)),
418 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)),
419 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)),
420 nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)),
421 nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)),
422 nid, K(node_page_state(pgdat, NR_UNEVICTABLE)),
423 nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
424
425#ifdef CONFIG_HIGHMEM
426 len += sysfs_emit_at(buf, len,
427 "Node %d HighTotal: %8lu kB\n"
428 "Node %d HighFree: %8lu kB\n"
429 "Node %d LowTotal: %8lu kB\n"
430 "Node %d LowFree: %8lu kB\n",
431 nid, K(i.totalhigh),
432 nid, K(i.freehigh),
433 nid, K(i.totalram - i.totalhigh),
434 nid, K(i.freeram - i.freehigh));
435#endif
436 len += sysfs_emit_at(buf, len,
437 "Node %d Dirty: %8lu kB\n"
438 "Node %d Writeback: %8lu kB\n"
439 "Node %d FilePages: %8lu kB\n"
440 "Node %d Mapped: %8lu kB\n"
441 "Node %d AnonPages: %8lu kB\n"
442 "Node %d Shmem: %8lu kB\n"
443 "Node %d KernelStack: %8lu kB\n"
444#ifdef CONFIG_SHADOW_CALL_STACK
445 "Node %d ShadowCallStack:%8lu kB\n"
446#endif
447 "Node %d PageTables: %8lu kB\n"
448 "Node %d SecPageTables: %8lu kB\n"
449 "Node %d NFS_Unstable: %8lu kB\n"
450 "Node %d Bounce: %8lu kB\n"
451 "Node %d WritebackTmp: %8lu kB\n"
452 "Node %d KReclaimable: %8lu kB\n"
453 "Node %d Slab: %8lu kB\n"
454 "Node %d SReclaimable: %8lu kB\n"
455 "Node %d SUnreclaim: %8lu kB\n"
456#ifdef CONFIG_TRANSPARENT_HUGEPAGE
457 "Node %d AnonHugePages: %8lu kB\n"
458 "Node %d ShmemHugePages: %8lu kB\n"
459 "Node %d ShmemPmdMapped: %8lu kB\n"
460 "Node %d FileHugePages: %8lu kB\n"
461 "Node %d FilePmdMapped: %8lu kB\n"
462#endif
463#ifdef CONFIG_UNACCEPTED_MEMORY
464 "Node %d Unaccepted: %8lu kB\n"
465#endif
466 ,
467 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
468 nid, K(node_page_state(pgdat, NR_WRITEBACK)),
469 nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
470 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
471 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
472 nid, K(i.sharedram),
473 nid, node_page_state(pgdat, NR_KERNEL_STACK_KB),
474#ifdef CONFIG_SHADOW_CALL_STACK
475 nid, node_page_state(pgdat, NR_KERNEL_SCS_KB),
476#endif
477 nid, K(node_page_state(pgdat, NR_PAGETABLE)),
478 nid, K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)),
479 nid, 0UL,
480 nid, 0UL,
481 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
482 nid, K(sreclaimable +
483 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
484 nid, K(sreclaimable + sunreclaimable),
485 nid, K(sreclaimable),
486 nid, K(sunreclaimable)
487#ifdef CONFIG_TRANSPARENT_HUGEPAGE
488 ,
489 nid, K(node_page_state(pgdat, NR_ANON_THPS)),
490 nid, K(node_page_state(pgdat, NR_SHMEM_THPS)),
491 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)),
492 nid, K(node_page_state(pgdat, NR_FILE_THPS)),
493 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED))
494#endif
495#ifdef CONFIG_UNACCEPTED_MEMORY
496 ,
497 nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED))
498#endif
499 );
500 len += hugetlb_report_node_meminfo(buf, len, nid);
501 return len;
502}
503
504#undef K
505static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL);
506
507static ssize_t node_read_numastat(struct device *dev,
508 struct device_attribute *attr, char *buf)
509{
510 fold_vm_numa_events();
511 return sysfs_emit(buf,
512 "numa_hit %lu\n"
513 "numa_miss %lu\n"
514 "numa_foreign %lu\n"
515 "interleave_hit %lu\n"
516 "local_node %lu\n"
517 "other_node %lu\n",
518 sum_zone_numa_event_state(dev->id, NUMA_HIT),
519 sum_zone_numa_event_state(dev->id, NUMA_MISS),
520 sum_zone_numa_event_state(dev->id, NUMA_FOREIGN),
521 sum_zone_numa_event_state(dev->id, NUMA_INTERLEAVE_HIT),
522 sum_zone_numa_event_state(dev->id, NUMA_LOCAL),
523 sum_zone_numa_event_state(dev->id, NUMA_OTHER));
524}
525static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL);
526
527static ssize_t node_read_vmstat(struct device *dev,
528 struct device_attribute *attr, char *buf)
529{
530 int nid = dev->id;
531 struct pglist_data *pgdat = NODE_DATA(nid);
532 int i;
533 int len = 0;
534
535 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
536 len += sysfs_emit_at(buf, len, "%s %lu\n",
537 zone_stat_name(i),
538 sum_zone_node_page_state(nid, i));
539
540#ifdef CONFIG_NUMA
541 fold_vm_numa_events();
542 for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++)
543 len += sysfs_emit_at(buf, len, "%s %lu\n",
544 numa_stat_name(i),
545 sum_zone_numa_event_state(nid, i));
546
547#endif
548 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
549 unsigned long pages = node_page_state_pages(pgdat, i);
550
551 if (vmstat_item_print_in_thp(i))
552 pages /= HPAGE_PMD_NR;
553 len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i),
554 pages);
555 }
556
557 return len;
558}
559static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL);
560
561static ssize_t node_read_distance(struct device *dev,
562 struct device_attribute *attr, char *buf)
563{
564 int nid = dev->id;
565 int len = 0;
566 int i;
567
568 /*
569 * buf is currently PAGE_SIZE in length and each node needs 4 chars
570 * at the most (distance + space or newline).
571 */
572 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
573
574 for_each_online_node(i) {
575 len += sysfs_emit_at(buf, len, "%s%d",
576 i ? " " : "", node_distance(nid, i));
577 }
578
579 len += sysfs_emit_at(buf, len, "\n");
580 return len;
581}
582static DEVICE_ATTR(distance, 0444, node_read_distance, NULL);
583
584static struct attribute *node_dev_attrs[] = {
585 &dev_attr_meminfo.attr,
586 &dev_attr_numastat.attr,
587 &dev_attr_distance.attr,
588 &dev_attr_vmstat.attr,
589 NULL
590};
591
592static const struct bin_attribute *node_dev_bin_attrs[] = {
593 &bin_attr_cpumap,
594 &bin_attr_cpulist,
595 NULL
596};
597
598static const struct attribute_group node_dev_group = {
599 .attrs = node_dev_attrs,
600 .bin_attrs_new = node_dev_bin_attrs,
601};
602
603static const struct attribute_group *node_dev_groups[] = {
604 &node_dev_group,
605#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
606 &arch_node_dev_group,
607#endif
608#ifdef CONFIG_MEMORY_FAILURE
609 &memory_failure_attr_group,
610#endif
611 NULL
612};
613
614static void node_device_release(struct device *dev)
615{
616 kfree(to_node(dev));
617}
618
619/*
620 * register_node - Setup a sysfs device for a node.
621 * @num - Node number to use when creating the device.
622 *
623 * Initialize and register the node device.
624 */
625static int register_node(struct node *node, int num)
626{
627 int error;
628
629 node->dev.id = num;
630 node->dev.bus = &node_subsys;
631 node->dev.release = node_device_release;
632 node->dev.groups = node_dev_groups;
633 error = device_register(&node->dev);
634
635 if (error) {
636 put_device(&node->dev);
637 } else {
638 hugetlb_register_node(node);
639 compaction_register_node(node);
640 }
641
642 return error;
643}
644
645/**
646 * unregister_node - unregister a node device
647 * @node: node going away
648 *
649 * Unregisters a node device @node. All the devices on the node must be
650 * unregistered before calling this function.
651 */
652void unregister_node(struct node *node)
653{
654 hugetlb_unregister_node(node);
655 compaction_unregister_node(node);
656 node_remove_accesses(node);
657 node_remove_caches(node);
658 device_unregister(&node->dev);
659}
660
661struct node *node_devices[MAX_NUMNODES];
662
663/*
664 * register cpu under node
665 */
666int register_cpu_under_node(unsigned int cpu, unsigned int nid)
667{
668 int ret;
669 struct device *obj;
670
671 if (!node_online(nid))
672 return 0;
673
674 obj = get_cpu_device(cpu);
675 if (!obj)
676 return 0;
677
678 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
679 &obj->kobj,
680 kobject_name(&obj->kobj));
681 if (ret)
682 return ret;
683
684 return sysfs_create_link(&obj->kobj,
685 &node_devices[nid]->dev.kobj,
686 kobject_name(&node_devices[nid]->dev.kobj));
687}
688
689/**
690 * register_memory_node_under_compute_node - link memory node to its compute
691 * node for a given access class.
692 * @mem_nid: Memory node number
693 * @cpu_nid: Cpu node number
694 * @access: Access class to register
695 *
696 * Description:
697 * For use with platforms that may have separate memory and compute nodes.
698 * This function will export node relationships linking which memory
699 * initiator nodes can access memory targets at a given ranked access
700 * class.
701 */
702int register_memory_node_under_compute_node(unsigned int mem_nid,
703 unsigned int cpu_nid,
704 enum access_coordinate_class access)
705{
706 struct node *init_node, *targ_node;
707 struct node_access_nodes *initiator, *target;
708 int ret;
709
710 if (!node_online(cpu_nid) || !node_online(mem_nid))
711 return -ENODEV;
712
713 init_node = node_devices[cpu_nid];
714 targ_node = node_devices[mem_nid];
715 initiator = node_init_node_access(init_node, access);
716 target = node_init_node_access(targ_node, access);
717 if (!initiator || !target)
718 return -ENOMEM;
719
720 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets",
721 &targ_node->dev.kobj,
722 dev_name(&targ_node->dev));
723 if (ret)
724 return ret;
725
726 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators",
727 &init_node->dev.kobj,
728 dev_name(&init_node->dev));
729 if (ret)
730 goto err;
731
732 return 0;
733 err:
734 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets",
735 dev_name(&targ_node->dev));
736 return ret;
737}
738
739int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
740{
741 struct device *obj;
742
743 if (!node_online(nid))
744 return 0;
745
746 obj = get_cpu_device(cpu);
747 if (!obj)
748 return 0;
749
750 sysfs_remove_link(&node_devices[nid]->dev.kobj,
751 kobject_name(&obj->kobj));
752 sysfs_remove_link(&obj->kobj,
753 kobject_name(&node_devices[nid]->dev.kobj));
754
755 return 0;
756}
757
758#ifdef CONFIG_MEMORY_HOTPLUG
759static int __ref get_nid_for_pfn(unsigned long pfn)
760{
761#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
762 if (system_state < SYSTEM_RUNNING)
763 return early_pfn_to_nid(pfn);
764#endif
765 return pfn_to_nid(pfn);
766}
767
768static void do_register_memory_block_under_node(int nid,
769 struct memory_block *mem_blk,
770 enum meminit_context context)
771{
772 int ret;
773
774 memory_block_add_nid(mem_blk, nid, context);
775
776 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
777 &mem_blk->dev.kobj,
778 kobject_name(&mem_blk->dev.kobj));
779 if (ret && ret != -EEXIST)
780 dev_err_ratelimited(&node_devices[nid]->dev,
781 "can't create link to %s in sysfs (%d)\n",
782 kobject_name(&mem_blk->dev.kobj), ret);
783
784 ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj,
785 &node_devices[nid]->dev.kobj,
786 kobject_name(&node_devices[nid]->dev.kobj));
787 if (ret && ret != -EEXIST)
788 dev_err_ratelimited(&mem_blk->dev,
789 "can't create link to %s in sysfs (%d)\n",
790 kobject_name(&node_devices[nid]->dev.kobj),
791 ret);
792}
793
794/* register memory section under specified node if it spans that node */
795static int register_mem_block_under_node_early(struct memory_block *mem_blk,
796 void *arg)
797{
798 unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
799 unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
800 unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
801 int nid = *(int *)arg;
802 unsigned long pfn;
803
804 for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
805 int page_nid;
806
807 /*
808 * memory block could have several absent sections from start.
809 * skip pfn range from absent section
810 */
811 if (!pfn_in_present_section(pfn)) {
812 pfn = round_down(pfn + PAGES_PER_SECTION,
813 PAGES_PER_SECTION) - 1;
814 continue;
815 }
816
817 /*
818 * We need to check if page belongs to nid only at the boot
819 * case because node's ranges can be interleaved.
820 */
821 page_nid = get_nid_for_pfn(pfn);
822 if (page_nid < 0)
823 continue;
824 if (page_nid != nid)
825 continue;
826
827 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_EARLY);
828 return 0;
829 }
830 /* mem section does not span the specified node */
831 return 0;
832}
833
834/*
835 * During hotplug we know that all pages in the memory block belong to the same
836 * node.
837 */
838static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk,
839 void *arg)
840{
841 int nid = *(int *)arg;
842
843 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_HOTPLUG);
844 return 0;
845}
846
847/*
848 * Unregister a memory block device under the node it spans. Memory blocks
849 * with multiple nodes cannot be offlined and therefore also never be removed.
850 */
851void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
852{
853 if (mem_blk->nid == NUMA_NO_NODE)
854 return;
855
856 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj,
857 kobject_name(&mem_blk->dev.kobj));
858 sysfs_remove_link(&mem_blk->dev.kobj,
859 kobject_name(&node_devices[mem_blk->nid]->dev.kobj));
860}
861
862void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
863 unsigned long end_pfn,
864 enum meminit_context context)
865{
866 walk_memory_blocks_func_t func;
867
868 if (context == MEMINIT_HOTPLUG)
869 func = register_mem_block_under_node_hotplug;
870 else
871 func = register_mem_block_under_node_early;
872
873 walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
874 (void *)&nid, func);
875 return;
876}
877#endif /* CONFIG_MEMORY_HOTPLUG */
878
879int __register_one_node(int nid)
880{
881 int error;
882 int cpu;
883 struct node *node;
884
885 node = kzalloc(sizeof(struct node), GFP_KERNEL);
886 if (!node)
887 return -ENOMEM;
888
889 INIT_LIST_HEAD(&node->access_list);
890 node_devices[nid] = node;
891
892 error = register_node(node_devices[nid], nid);
893
894 /* link cpu under this node */
895 for_each_present_cpu(cpu) {
896 if (cpu_to_node(cpu) == nid)
897 register_cpu_under_node(cpu, nid);
898 }
899
900 node_init_caches(nid);
901
902 return error;
903}
904
905void unregister_one_node(int nid)
906{
907 if (!node_devices[nid])
908 return;
909
910 unregister_node(node_devices[nid]);
911 node_devices[nid] = NULL;
912}
913
914/*
915 * node states attributes
916 */
917
918struct node_attr {
919 struct device_attribute attr;
920 enum node_states state;
921};
922
923static ssize_t show_node_state(struct device *dev,
924 struct device_attribute *attr, char *buf)
925{
926 struct node_attr *na = container_of(attr, struct node_attr, attr);
927
928 return sysfs_emit(buf, "%*pbl\n",
929 nodemask_pr_args(&node_states[na->state]));
930}
931
932#define _NODE_ATTR(name, state) \
933 { __ATTR(name, 0444, show_node_state, NULL), state }
934
935static struct node_attr node_state_attr[] = {
936 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
937 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
938 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
939#ifdef CONFIG_HIGHMEM
940 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
941#endif
942 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
943 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
944 [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator,
945 N_GENERIC_INITIATOR),
946};
947
948static struct attribute *node_state_attrs[] = {
949 &node_state_attr[N_POSSIBLE].attr.attr,
950 &node_state_attr[N_ONLINE].attr.attr,
951 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
952#ifdef CONFIG_HIGHMEM
953 &node_state_attr[N_HIGH_MEMORY].attr.attr,
954#endif
955 &node_state_attr[N_MEMORY].attr.attr,
956 &node_state_attr[N_CPU].attr.attr,
957 &node_state_attr[N_GENERIC_INITIATOR].attr.attr,
958 NULL
959};
960
961static const struct attribute_group memory_root_attr_group = {
962 .attrs = node_state_attrs,
963};
964
965static const struct attribute_group *cpu_root_attr_groups[] = {
966 &memory_root_attr_group,
967 NULL,
968};
969
970void __init node_dev_init(void)
971{
972 int ret, i;
973
974 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
975 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
976
977 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
978 if (ret)
979 panic("%s() failed to register subsystem: %d\n", __func__, ret);
980
981 /*
982 * Create all node devices, which will properly link the node
983 * to applicable memory block devices and already created cpu devices.
984 */
985 for_each_online_node(i) {
986 ret = register_one_node(i);
987 if (ret)
988 panic("%s() failed to add node: %d\n", __func__, ret);
989 }
990}
Linux 6.x block layer and io_uring tree(s)