projects/linux·blob v5.19 · refs

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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
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, 0);
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, 0);
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 * @hmem_attrs: Heterogeneous memory performance attributes
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 node_hmem_attrs hmem_attrs;
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(name) \
165static ssize_t name##_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)->hmem_attrs.name); \
171} \
172static DEVICE_ATTR_RO(name)
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 * @hmem_attrs: Heterogeneous memory performance attributes
191 * @access: The access class the for the given attributes
192 */
193void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
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->hmem_attrs = *hmem_attrs;
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 NFS_Unstable: %8lu kB\n"
437 "Node %d Bounce: %8lu kB\n"
438 "Node %d WritebackTmp: %8lu kB\n"
439 "Node %d KReclaimable: %8lu kB\n"
440 "Node %d Slab: %8lu kB\n"
441 "Node %d SReclaimable: %8lu kB\n"
442 "Node %d SUnreclaim: %8lu kB\n"
443#ifdef CONFIG_TRANSPARENT_HUGEPAGE
444 "Node %d AnonHugePages: %8lu kB\n"
445 "Node %d ShmemHugePages: %8lu kB\n"
446 "Node %d ShmemPmdMapped: %8lu kB\n"
447 "Node %d FileHugePages: %8lu kB\n"
448 "Node %d FilePmdMapped: %8lu kB\n"
449#endif
450 ,
451 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
452 nid, K(node_page_state(pgdat, NR_WRITEBACK)),
453 nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
454 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
455 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
456 nid, K(i.sharedram),
457 nid, node_page_state(pgdat, NR_KERNEL_STACK_KB),
458#ifdef CONFIG_SHADOW_CALL_STACK
459 nid, node_page_state(pgdat, NR_KERNEL_SCS_KB),
460#endif
461 nid, K(node_page_state(pgdat, NR_PAGETABLE)),
462 nid, 0UL,
463 nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
464 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
465 nid, K(sreclaimable +
466 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
467 nid, K(sreclaimable + sunreclaimable),
468 nid, K(sreclaimable),
469 nid, K(sunreclaimable)
470#ifdef CONFIG_TRANSPARENT_HUGEPAGE
471 ,
472 nid, K(node_page_state(pgdat, NR_ANON_THPS)),
473 nid, K(node_page_state(pgdat, NR_SHMEM_THPS)),
474 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)),
475 nid, K(node_page_state(pgdat, NR_FILE_THPS)),
476 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED))
477#endif
478 );
479 len += hugetlb_report_node_meminfo(buf, len, nid);
480 return len;
481}
482
483#undef K
484static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL);
485
486static ssize_t node_read_numastat(struct device *dev,
487 struct device_attribute *attr, char *buf)
488{
489 fold_vm_numa_events();
490 return sysfs_emit(buf,
491 "numa_hit %lu\n"
492 "numa_miss %lu\n"
493 "numa_foreign %lu\n"
494 "interleave_hit %lu\n"
495 "local_node %lu\n"
496 "other_node %lu\n",
497 sum_zone_numa_event_state(dev->id, NUMA_HIT),
498 sum_zone_numa_event_state(dev->id, NUMA_MISS),
499 sum_zone_numa_event_state(dev->id, NUMA_FOREIGN),
500 sum_zone_numa_event_state(dev->id, NUMA_INTERLEAVE_HIT),
501 sum_zone_numa_event_state(dev->id, NUMA_LOCAL),
502 sum_zone_numa_event_state(dev->id, NUMA_OTHER));
503}
504static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL);
505
506static ssize_t node_read_vmstat(struct device *dev,
507 struct device_attribute *attr, char *buf)
508{
509 int nid = dev->id;
510 struct pglist_data *pgdat = NODE_DATA(nid);
511 int i;
512 int len = 0;
513
514 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
515 len += sysfs_emit_at(buf, len, "%s %lu\n",
516 zone_stat_name(i),
517 sum_zone_node_page_state(nid, i));
518
519#ifdef CONFIG_NUMA
520 fold_vm_numa_events();
521 for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++)
522 len += sysfs_emit_at(buf, len, "%s %lu\n",
523 numa_stat_name(i),
524 sum_zone_numa_event_state(nid, i));
525
526#endif
527 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
528 unsigned long pages = node_page_state_pages(pgdat, i);
529
530 if (vmstat_item_print_in_thp(i))
531 pages /= HPAGE_PMD_NR;
532 len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i),
533 pages);
534 }
535
536 return len;
537}
538static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL);
539
540static ssize_t node_read_distance(struct device *dev,
541 struct device_attribute *attr, char *buf)
542{
543 int nid = dev->id;
544 int len = 0;
545 int i;
546
547 /*
548 * buf is currently PAGE_SIZE in length and each node needs 4 chars
549 * at the most (distance + space or newline).
550 */
551 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
552
553 for_each_online_node(i) {
554 len += sysfs_emit_at(buf, len, "%s%d",
555 i ? " " : "", node_distance(nid, i));
556 }
557
558 len += sysfs_emit_at(buf, len, "\n");
559 return len;
560}
561static DEVICE_ATTR(distance, 0444, node_read_distance, NULL);
562
563static struct attribute *node_dev_attrs[] = {
564 &dev_attr_meminfo.attr,
565 &dev_attr_numastat.attr,
566 &dev_attr_distance.attr,
567 &dev_attr_vmstat.attr,
568 NULL
569};
570
571static struct bin_attribute *node_dev_bin_attrs[] = {
572 &bin_attr_cpumap,
573 &bin_attr_cpulist,
574 NULL
575};
576
577static const struct attribute_group node_dev_group = {
578 .attrs = node_dev_attrs,
579 .bin_attrs = node_dev_bin_attrs
580};
581
582static const struct attribute_group *node_dev_groups[] = {
583 &node_dev_group,
584#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
585 &arch_node_dev_group,
586#endif
587 NULL
588};
589
590#ifdef CONFIG_HUGETLBFS
591/*
592 * hugetlbfs per node attributes registration interface:
593 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
594 * it will register its per node attributes for all online nodes with
595 * memory. It will also call register_hugetlbfs_with_node(), below, to
596 * register its attribute registration functions with this node driver.
597 * Once these hooks have been initialized, the node driver will call into
598 * the hugetlb module to [un]register attributes for hot-plugged nodes.
599 */
600static node_registration_func_t __hugetlb_register_node;
601static node_registration_func_t __hugetlb_unregister_node;
602
603static inline bool hugetlb_register_node(struct node *node)
604{
605 if (__hugetlb_register_node &&
606 node_state(node->dev.id, N_MEMORY)) {
607 __hugetlb_register_node(node);
608 return true;
609 }
610 return false;
611}
612
613static inline void hugetlb_unregister_node(struct node *node)
614{
615 if (__hugetlb_unregister_node)
616 __hugetlb_unregister_node(node);
617}
618
619void register_hugetlbfs_with_node(node_registration_func_t doregister,
620 node_registration_func_t unregister)
621{
622 __hugetlb_register_node = doregister;
623 __hugetlb_unregister_node = unregister;
624}
625#else
626static inline void hugetlb_register_node(struct node *node) {}
627
628static inline void hugetlb_unregister_node(struct node *node) {}
629#endif
630
631static void node_device_release(struct device *dev)
632{
633 struct node *node = to_node(dev);
634
635#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_HUGETLBFS)
636 /*
637 * We schedule the work only when a memory section is
638 * onlined/offlined on this node. When we come here,
639 * all the memory on this node has been offlined,
640 * so we won't enqueue new work to this work.
641 *
642 * The work is using node->node_work, so we should
643 * flush work before freeing the memory.
644 */
645 flush_work(&node->node_work);
646#endif
647 kfree(node);
648}
649
650/*
651 * register_node - Setup a sysfs device for a node.
652 * @num - Node number to use when creating the device.
653 *
654 * Initialize and register the node device.
655 */
656static int register_node(struct node *node, int num)
657{
658 int error;
659
660 node->dev.id = num;
661 node->dev.bus = &node_subsys;
662 node->dev.release = node_device_release;
663 node->dev.groups = node_dev_groups;
664 error = device_register(&node->dev);
665
666 if (error)
667 put_device(&node->dev);
668 else {
669 hugetlb_register_node(node);
670
671 compaction_register_node(node);
672 }
673 return error;
674}
675
676/**
677 * unregister_node - unregister a node device
678 * @node: node going away
679 *
680 * Unregisters a node device @node. All the devices on the node must be
681 * unregistered before calling this function.
682 */
683void unregister_node(struct node *node)
684{
685 compaction_unregister_node(node);
686 hugetlb_unregister_node(node); /* no-op, if memoryless node */
687 node_remove_accesses(node);
688 node_remove_caches(node);
689 device_unregister(&node->dev);
690}
691
692struct node *node_devices[MAX_NUMNODES];
693
694/*
695 * register cpu under node
696 */
697int register_cpu_under_node(unsigned int cpu, unsigned int nid)
698{
699 int ret;
700 struct device *obj;
701
702 if (!node_online(nid))
703 return 0;
704
705 obj = get_cpu_device(cpu);
706 if (!obj)
707 return 0;
708
709 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
710 &obj->kobj,
711 kobject_name(&obj->kobj));
712 if (ret)
713 return ret;
714
715 return sysfs_create_link(&obj->kobj,
716 &node_devices[nid]->dev.kobj,
717 kobject_name(&node_devices[nid]->dev.kobj));
718}
719
720/**
721 * register_memory_node_under_compute_node - link memory node to its compute
722 * node for a given access class.
723 * @mem_nid: Memory node number
724 * @cpu_nid: Cpu node number
725 * @access: Access class to register
726 *
727 * Description:
728 * For use with platforms that may have separate memory and compute nodes.
729 * This function will export node relationships linking which memory
730 * initiator nodes can access memory targets at a given ranked access
731 * class.
732 */
733int register_memory_node_under_compute_node(unsigned int mem_nid,
734 unsigned int cpu_nid,
735 unsigned int access)
736{
737 struct node *init_node, *targ_node;
738 struct node_access_nodes *initiator, *target;
739 int ret;
740
741 if (!node_online(cpu_nid) || !node_online(mem_nid))
742 return -ENODEV;
743
744 init_node = node_devices[cpu_nid];
745 targ_node = node_devices[mem_nid];
746 initiator = node_init_node_access(init_node, access);
747 target = node_init_node_access(targ_node, access);
748 if (!initiator || !target)
749 return -ENOMEM;
750
751 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets",
752 &targ_node->dev.kobj,
753 dev_name(&targ_node->dev));
754 if (ret)
755 return ret;
756
757 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators",
758 &init_node->dev.kobj,
759 dev_name(&init_node->dev));
760 if (ret)
761 goto err;
762
763 return 0;
764 err:
765 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets",
766 dev_name(&targ_node->dev));
767 return ret;
768}
769
770int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
771{
772 struct device *obj;
773
774 if (!node_online(nid))
775 return 0;
776
777 obj = get_cpu_device(cpu);
778 if (!obj)
779 return 0;
780
781 sysfs_remove_link(&node_devices[nid]->dev.kobj,
782 kobject_name(&obj->kobj));
783 sysfs_remove_link(&obj->kobj,
784 kobject_name(&node_devices[nid]->dev.kobj));
785
786 return 0;
787}
788
789#ifdef CONFIG_MEMORY_HOTPLUG
790static int __ref get_nid_for_pfn(unsigned long pfn)
791{
792#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
793 if (system_state < SYSTEM_RUNNING)
794 return early_pfn_to_nid(pfn);
795#endif
796 return pfn_to_nid(pfn);
797}
798
799static void do_register_memory_block_under_node(int nid,
800 struct memory_block *mem_blk,
801 enum meminit_context context)
802{
803 int ret;
804
805 memory_block_add_nid(mem_blk, nid, context);
806
807 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
808 &mem_blk->dev.kobj,
809 kobject_name(&mem_blk->dev.kobj));
810 if (ret && ret != -EEXIST)
811 dev_err_ratelimited(&node_devices[nid]->dev,
812 "can't create link to %s in sysfs (%d)\n",
813 kobject_name(&mem_blk->dev.kobj), ret);
814
815 ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj,
816 &node_devices[nid]->dev.kobj,
817 kobject_name(&node_devices[nid]->dev.kobj));
818 if (ret && ret != -EEXIST)
819 dev_err_ratelimited(&mem_blk->dev,
820 "can't create link to %s in sysfs (%d)\n",
821 kobject_name(&node_devices[nid]->dev.kobj),
822 ret);
823}
824
825/* register memory section under specified node if it spans that node */
826static int register_mem_block_under_node_early(struct memory_block *mem_blk,
827 void *arg)
828{
829 unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
830 unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
831 unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
832 int nid = *(int *)arg;
833 unsigned long pfn;
834
835 for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
836 int page_nid;
837
838 /*
839 * memory block could have several absent sections from start.
840 * skip pfn range from absent section
841 */
842 if (!pfn_in_present_section(pfn)) {
843 pfn = round_down(pfn + PAGES_PER_SECTION,
844 PAGES_PER_SECTION) - 1;
845 continue;
846 }
847
848 /*
849 * We need to check if page belongs to nid only at the boot
850 * case because node's ranges can be interleaved.
851 */
852 page_nid = get_nid_for_pfn(pfn);
853 if (page_nid < 0)
854 continue;
855 if (page_nid != nid)
856 continue;
857
858 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_EARLY);
859 return 0;
860 }
861 /* mem section does not span the specified node */
862 return 0;
863}
864
865/*
866 * During hotplug we know that all pages in the memory block belong to the same
867 * node.
868 */
869static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk,
870 void *arg)
871{
872 int nid = *(int *)arg;
873
874 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_HOTPLUG);
875 return 0;
876}
877
878/*
879 * Unregister a memory block device under the node it spans. Memory blocks
880 * with multiple nodes cannot be offlined and therefore also never be removed.
881 */
882void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
883{
884 if (mem_blk->nid == NUMA_NO_NODE)
885 return;
886
887 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj,
888 kobject_name(&mem_blk->dev.kobj));
889 sysfs_remove_link(&mem_blk->dev.kobj,
890 kobject_name(&node_devices[mem_blk->nid]->dev.kobj));
891}
892
893void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
894 unsigned long end_pfn,
895 enum meminit_context context)
896{
897 walk_memory_blocks_func_t func;
898
899 if (context == MEMINIT_HOTPLUG)
900 func = register_mem_block_under_node_hotplug;
901 else
902 func = register_mem_block_under_node_early;
903
904 walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
905 (void *)&nid, func);
906 return;
907}
908
909#ifdef CONFIG_HUGETLBFS
910/*
911 * Handle per node hstate attribute [un]registration on transistions
912 * to/from memoryless state.
913 */
914static void node_hugetlb_work(struct work_struct *work)
915{
916 struct node *node = container_of(work, struct node, node_work);
917
918 /*
919 * We only get here when a node transitions to/from memoryless state.
920 * We can detect which transition occurred by examining whether the
921 * node has memory now. hugetlb_register_node() already check this
922 * so we try to register the attributes. If that fails, then the
923 * node has transitioned to memoryless, try to unregister the
924 * attributes.
925 */
926 if (!hugetlb_register_node(node))
927 hugetlb_unregister_node(node);
928}
929
930static void init_node_hugetlb_work(int nid)
931{
932 INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
933}
934
935static int node_memory_callback(struct notifier_block *self,
936 unsigned long action, void *arg)
937{
938 struct memory_notify *mnb = arg;
939 int nid = mnb->status_change_nid;
940
941 switch (action) {
942 case MEM_ONLINE:
943 case MEM_OFFLINE:
944 /*
945 * offload per node hstate [un]registration to a work thread
946 * when transitioning to/from memoryless state.
947 */
948 if (nid != NUMA_NO_NODE)
949 schedule_work(&node_devices[nid]->node_work);
950 break;
951
952 case MEM_GOING_ONLINE:
953 case MEM_GOING_OFFLINE:
954 case MEM_CANCEL_ONLINE:
955 case MEM_CANCEL_OFFLINE:
956 default:
957 break;
958 }
959
960 return NOTIFY_OK;
961}
962#endif /* CONFIG_HUGETLBFS */
963#endif /* CONFIG_MEMORY_HOTPLUG */
964
965#if !defined(CONFIG_MEMORY_HOTPLUG) || !defined(CONFIG_HUGETLBFS)
966static inline int node_memory_callback(struct notifier_block *self,
967 unsigned long action, void *arg)
968{
969 return NOTIFY_OK;
970}
971
972static void init_node_hugetlb_work(int nid) { }
973
974#endif
975
976int __register_one_node(int nid)
977{
978 int error;
979 int cpu;
980
981 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
982 if (!node_devices[nid])
983 return -ENOMEM;
984
985 error = register_node(node_devices[nid], nid);
986
987 /* link cpu under this node */
988 for_each_present_cpu(cpu) {
989 if (cpu_to_node(cpu) == nid)
990 register_cpu_under_node(cpu, nid);
991 }
992
993 INIT_LIST_HEAD(&node_devices[nid]->access_list);
994 /* initialize work queue for memory hot plug */
995 init_node_hugetlb_work(nid);
996 node_init_caches(nid);
997
998 return error;
999}
1000
1001void unregister_one_node(int nid)
1002{
1003 if (!node_devices[nid])
1004 return;
1005
1006 unregister_node(node_devices[nid]);
1007 node_devices[nid] = NULL;
1008}
1009
1010/*
1011 * node states attributes
1012 */
1013
1014struct node_attr {
1015 struct device_attribute attr;
1016 enum node_states state;
1017};
1018
1019static ssize_t show_node_state(struct device *dev,
1020 struct device_attribute *attr, char *buf)
1021{
1022 struct node_attr *na = container_of(attr, struct node_attr, attr);
1023
1024 return sysfs_emit(buf, "%*pbl\n",
1025 nodemask_pr_args(&node_states[na->state]));
1026}
1027
1028#define _NODE_ATTR(name, state) \
1029 { __ATTR(name, 0444, show_node_state, NULL), state }
1030
1031static struct node_attr node_state_attr[] = {
1032 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
1033 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
1034 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
1035#ifdef CONFIG_HIGHMEM
1036 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
1037#endif
1038 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
1039 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
1040 [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator,
1041 N_GENERIC_INITIATOR),
1042};
1043
1044static struct attribute *node_state_attrs[] = {
1045 &node_state_attr[N_POSSIBLE].attr.attr,
1046 &node_state_attr[N_ONLINE].attr.attr,
1047 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
1048#ifdef CONFIG_HIGHMEM
1049 &node_state_attr[N_HIGH_MEMORY].attr.attr,
1050#endif
1051 &node_state_attr[N_MEMORY].attr.attr,
1052 &node_state_attr[N_CPU].attr.attr,
1053 &node_state_attr[N_GENERIC_INITIATOR].attr.attr,
1054 NULL
1055};
1056
1057static const struct attribute_group memory_root_attr_group = {
1058 .attrs = node_state_attrs,
1059};
1060
1061static const struct attribute_group *cpu_root_attr_groups[] = {
1062 &memory_root_attr_group,
1063 NULL,
1064};
1065
1066#define NODE_CALLBACK_PRI 2 /* lower than SLAB */
1067void __init node_dev_init(void)
1068{
1069 static struct notifier_block node_memory_callback_nb = {
1070 .notifier_call = node_memory_callback,
1071 .priority = NODE_CALLBACK_PRI,
1072 };
1073 int ret, i;
1074
1075 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
1076 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
1077
1078 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
1079 if (ret)
1080 panic("%s() failed to register subsystem: %d\n", __func__, ret);
1081
1082 register_hotmemory_notifier(&node_memory_callback_nb);
1083
1084 /*
1085 * Create all node devices, which will properly link the node
1086 * to applicable memory block devices and already created cpu devices.
1087 */
1088 for_each_online_node(i) {
1089 ret = register_one_node(i);
1090 if (ret)
1091 panic("%s() failed to add node: %d\n", __func__, ret);
1092 }
1093}