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
24 static struct bus_type node_subsys = {
25 .name = "node",
26 .dev_name = "node",
27 };
28
cpumap_read(struct file * file,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)29 static 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
48 static BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES);
49
cpulist_read(struct file * file,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)50 static 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
69 static 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 * @hmem_attrs: Heterogeneous memory performance attributes
78 */
79 struct 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
89 static struct attribute *node_init_access_node_attrs[] = {
90 NULL,
91 };
92
93 static struct attribute *node_targ_access_node_attrs[] = {
94 NULL,
95 };
96
97 static const struct attribute_group initiators = {
98 .name = "initiators",
99 .attrs = node_init_access_node_attrs,
100 };
101
102 static const struct attribute_group targets = {
103 .name = "targets",
104 .attrs = node_targ_access_node_attrs,
105 };
106
107 static const struct attribute_group *node_access_node_groups[] = {
108 &initiators,
109 &targets,
110 NULL,
111 };
112
node_remove_accesses(struct node * node)113 static 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
node_access_release(struct device * dev)123 static void node_access_release(struct device *dev)
124 {
125 kfree(to_access_nodes(dev));
126 }
127
node_init_node_access(struct node * node,unsigned int access)128 static 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;
156 free_name:
157 kfree_const(dev->kobj.name);
158 free:
159 kfree(access_node);
160 return NULL;
161 }
162
163 #ifdef CONFIG_HMEM_REPORTING
164 #define ACCESS_ATTR(property) \
165 static 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)->hmem_attrs.property); \
171 } \
172 static DEVICE_ATTR_RO(property)
173
174 ACCESS_ATTR(read_bandwidth);
175 ACCESS_ATTR(read_latency);
176 ACCESS_ATTR(write_bandwidth);
177 ACCESS_ATTR(write_latency);
178
179 static 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 */
node_set_perf_attrs(unsigned int nid,struct node_hmem_attrs * hmem_attrs,unsigned int access)193 void 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 */
225 struct 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) \
233 static 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 } \
240 static DEVICE_ATTR_RO(name);
241
242 CACHE_ATTR(size, "%llu")
243 CACHE_ATTR(line_size, "%u")
244 CACHE_ATTR(indexing, "%u")
245 CACHE_ATTR(write_policy, "%u")
246
247 static 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 };
254 ATTRIBUTE_GROUPS(cache);
255
node_cache_release(struct device * dev)256 static void node_cache_release(struct device *dev)
257 {
258 kfree(dev);
259 }
260
node_cacheinfo_release(struct device * dev)261 static void node_cacheinfo_release(struct device *dev)
262 {
263 struct node_cache_info *info = to_cache_info(dev);
264 kfree(info);
265 }
266
node_init_cache_dev(struct node * node)267 static 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;
287 put_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 */
node_add_cache(unsigned int nid,struct node_cache_attrs * cache_attrs)296 void 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;
341 put_device:
342 put_device(dev);
343 }
344
node_remove_caches(struct node * node)345 static 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
node_init_caches(unsigned int nid)359 static void node_init_caches(unsigned int nid)
360 {
361 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);
362 }
363 #else
node_init_caches(unsigned int nid)364 static void node_init_caches(unsigned int nid) { }
node_remove_caches(struct node * node)365 static void node_remove_caches(struct node *node) { }
366 #endif
367
368 #define K(x) ((x) << (PAGE_SHIFT - 10))
node_read_meminfo(struct device * dev,struct device_attribute * attr,char * buf)369 static 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
493 static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL);
494
node_read_numastat(struct device * dev,struct device_attribute * attr,char * buf)495 static 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 }
513 static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL);
514
node_read_vmstat(struct device * dev,struct device_attribute * attr,char * buf)515 static 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 }
547 static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL);
548
node_read_distance(struct device * dev,struct device_attribute * attr,char * buf)549 static 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 }
570 static DEVICE_ATTR(distance, 0444, node_read_distance, NULL);
571
572 static 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
580 static struct bin_attribute *node_dev_bin_attrs[] = {
581 &bin_attr_cpumap,
582 &bin_attr_cpulist,
583 NULL
584 };
585
586 static const struct attribute_group node_dev_group = {
587 .attrs = node_dev_attrs,
588 .bin_attrs = node_dev_bin_attrs
589 };
590
591 static 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
node_device_release(struct device * dev)602 static 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 */
register_node(struct node * node,int num)613 static 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 */
unregister_node(struct node * node)640 void 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
649 struct node *node_devices[MAX_NUMNODES];
650
651 /*
652 * register cpu under node
653 */
register_cpu_under_node(unsigned int cpu,unsigned int nid)654 int 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 */
register_memory_node_under_compute_node(unsigned int mem_nid,unsigned int cpu_nid,unsigned int access)690 int 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
unregister_cpu_under_node(unsigned int cpu,unsigned int nid)727 int 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
get_nid_for_pfn(unsigned long pfn)747 static 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
do_register_memory_block_under_node(int nid,struct memory_block * mem_blk,enum meminit_context context)756 static 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 */
register_mem_block_under_node_early(struct memory_block * mem_blk,void * arg)783 static 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 */
register_mem_block_under_node_hotplug(struct memory_block * mem_blk,void * arg)826 static 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 */
unregister_memory_block_under_nodes(struct memory_block * mem_blk)839 void 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
register_memory_blocks_under_node(int nid,unsigned long start_pfn,unsigned long end_pfn,enum meminit_context context)850 void 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
__register_one_node(int nid)867 int __register_one_node(int nid)
868 {
869 int error;
870 int cpu;
871
872 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
873 if (!node_devices[nid])
874 return -ENOMEM;
875
876 error = register_node(node_devices[nid], nid);
877
878 /* link cpu under this node */
879 for_each_present_cpu(cpu) {
880 if (cpu_to_node(cpu) == nid)
881 register_cpu_under_node(cpu, nid);
882 }
883
884 INIT_LIST_HEAD(&node_devices[nid]->access_list);
885 node_init_caches(nid);
886
887 return error;
888 }
889
unregister_one_node(int nid)890 void unregister_one_node(int nid)
891 {
892 if (!node_devices[nid])
893 return;
894
895 unregister_node(node_devices[nid]);
896 node_devices[nid] = NULL;
897 }
898
899 /*
900 * node states attributes
901 */
902
903 struct node_attr {
904 struct device_attribute attr;
905 enum node_states state;
906 };
907
show_node_state(struct device * dev,struct device_attribute * attr,char * buf)908 static ssize_t show_node_state(struct device *dev,
909 struct device_attribute *attr, char *buf)
910 {
911 struct node_attr *na = container_of(attr, struct node_attr, attr);
912
913 return sysfs_emit(buf, "%*pbl\n",
914 nodemask_pr_args(&node_states[na->state]));
915 }
916
917 #define _NODE_ATTR(name, state) \
918 { __ATTR(name, 0444, show_node_state, NULL), state }
919
920 static struct node_attr node_state_attr[] = {
921 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
922 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
923 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
924 #ifdef CONFIG_HIGHMEM
925 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
926 #endif
927 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
928 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
929 [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator,
930 N_GENERIC_INITIATOR),
931 };
932
933 static struct attribute *node_state_attrs[] = {
934 &node_state_attr[N_POSSIBLE].attr.attr,
935 &node_state_attr[N_ONLINE].attr.attr,
936 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
937 #ifdef CONFIG_HIGHMEM
938 &node_state_attr[N_HIGH_MEMORY].attr.attr,
939 #endif
940 &node_state_attr[N_MEMORY].attr.attr,
941 &node_state_attr[N_CPU].attr.attr,
942 &node_state_attr[N_GENERIC_INITIATOR].attr.attr,
943 NULL
944 };
945
946 static const struct attribute_group memory_root_attr_group = {
947 .attrs = node_state_attrs,
948 };
949
950 static const struct attribute_group *cpu_root_attr_groups[] = {
951 &memory_root_attr_group,
952 NULL,
953 };
954
node_dev_init(void)955 void __init node_dev_init(void)
956 {
957 int ret, i;
958
959 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
960 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
961
962 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
963 if (ret)
964 panic("%s() failed to register subsystem: %d\n", __func__, ret);
965
966 /*
967 * Create all node devices, which will properly link the node
968 * to applicable memory block devices and already created cpu devices.
969 */
970 for_each_online_node(i) {
971 ret = register_one_node(i);
972 if (ret)
973 panic("%s() failed to add node: %d\n", __func__, ret);
974 }
975 }
976
