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