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Merge tag 'io_uring-5.11-2021-01-16' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / base / node.c
blob04f71c7bc3f83867cefd7fa9ba0cda4d236c2209
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
29
30 static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
31 {
32 ssize_t n;
33 cpumask_var_t mask;
34 struct node *node_dev = to_node(dev);
35
36 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
37 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
38
39 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
40 return 0;
41
42 cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
43 n = cpumap_print_to_pagebuf(list, buf, mask);
44 free_cpumask_var(mask);
45
46 return n;
47 }
48
49 static inline ssize_t cpumap_show(struct device *dev,
50 struct device_attribute *attr,
51 char *buf)
52 {
53 return node_read_cpumap(dev, false, buf);
54 }
55
56 static DEVICE_ATTR_RO(cpumap);
57
58 static inline ssize_t cpulist_show(struct device *dev,
59 struct device_attribute *attr,
60 char *buf)
61 {
62 return node_read_cpumap(dev, true, buf);
63 }
64
65 static DEVICE_ATTR_RO(cpulist);
66
67 /**
68 * struct node_access_nodes - Access class device to hold user visible
69 * relationships to other nodes.
70 * @dev: Device for this memory access class
71 * @list_node: List element in the node's access list
72 * @access: The access class rank
73 * @hmem_attrs: Heterogeneous memory performance attributes
74 */
75 struct node_access_nodes {
76 struct device dev;
77 struct list_head list_node;
78 unsigned access;
79 #ifdef CONFIG_HMEM_REPORTING
80 struct node_hmem_attrs hmem_attrs;
81 #endif
82 };
83 #define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev)
84
85 static struct attribute *node_init_access_node_attrs[] = {
86 NULL,
87 };
88
89 static struct attribute *node_targ_access_node_attrs[] = {
90 NULL,
91 };
92
93 static const struct attribute_group initiators = {
94 .name = "initiators",
95 .attrs = node_init_access_node_attrs,
96 };
97
98 static const struct attribute_group targets = {
99 .name = "targets",
100 .attrs = node_targ_access_node_attrs,
101 };
102
103 static const struct attribute_group *node_access_node_groups[] = {
104 &initiators,
105 &targets,
106 NULL,
107 };
108
109 static void node_remove_accesses(struct node *node)
110 {
111 struct node_access_nodes *c, *cnext;
112
113 list_for_each_entry_safe(c, cnext, &node->access_list, list_node) {
114 list_del(&c->list_node);
115 device_unregister(&c->dev);
116 }
117 }
118
119 static void node_access_release(struct device *dev)
120 {
121 kfree(to_access_nodes(dev));
122 }
123
124 static struct node_access_nodes *node_init_node_access(struct node *node,
125 unsigned access)
126 {
127 struct node_access_nodes *access_node;
128 struct device *dev;
129
130 list_for_each_entry(access_node, &node->access_list, list_node)
131 if (access_node->access == access)
132 return access_node;
133
134 access_node = kzalloc(sizeof(*access_node), GFP_KERNEL);
135 if (!access_node)
136 return NULL;
137
138 access_node->access = access;
139 dev = &access_node->dev;
140 dev->parent = &node->dev;
141 dev->release = node_access_release;
142 dev->groups = node_access_node_groups;
143 if (dev_set_name(dev, "access%u", access))
144 goto free;
145
146 if (device_register(dev))
147 goto free_name;
148
149 pm_runtime_no_callbacks(dev);
150 list_add_tail(&access_node->list_node, &node->access_list);
151 return access_node;
152 free_name:
153 kfree_const(dev->kobj.name);
154 free:
155 kfree(access_node);
156 return NULL;
157 }
158
159 #ifdef CONFIG_HMEM_REPORTING
160 #define ACCESS_ATTR(name) \
161 static ssize_t name##_show(struct device *dev, \
162 struct device_attribute *attr, \
163 char *buf) \
164 { \
165 return sysfs_emit(buf, "%u\n", \
166 to_access_nodes(dev)->hmem_attrs.name); \
167 } \
168 static DEVICE_ATTR_RO(name)
169
170 ACCESS_ATTR(read_bandwidth);
171 ACCESS_ATTR(read_latency);
172 ACCESS_ATTR(write_bandwidth);
173 ACCESS_ATTR(write_latency);
174
175 static struct attribute *access_attrs[] = {
176 &dev_attr_read_bandwidth.attr,
177 &dev_attr_read_latency.attr,
178 &dev_attr_write_bandwidth.attr,
179 &dev_attr_write_latency.attr,
180 NULL,
181 };
182
183 /**
184 * node_set_perf_attrs - Set the performance values for given access class
185 * @nid: Node identifier to be set
186 * @hmem_attrs: Heterogeneous memory performance attributes
187 * @access: The access class the for the given attributes
188 */
189 void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
190 unsigned access)
191 {
192 struct node_access_nodes *c;
193 struct node *node;
194 int i;
195
196 if (WARN_ON_ONCE(!node_online(nid)))
197 return;
198
199 node = node_devices[nid];
200 c = node_init_node_access(node, access);
201 if (!c)
202 return;
203
204 c->hmem_attrs = *hmem_attrs;
205 for (i = 0; access_attrs[i] != NULL; i++) {
206 if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i],
207 "initiators")) {
208 pr_info("failed to add performance attribute to node %d\n",
209 nid);
210 break;
211 }
212 }
213 }
214
215 /**
216 * struct node_cache_info - Internal tracking for memory node caches
217 * @dev: Device represeting the cache level
218 * @node: List element for tracking in the node
219 * @cache_attrs:Attributes for this cache level
220 */
221 struct node_cache_info {
222 struct device dev;
223 struct list_head node;
224 struct node_cache_attrs cache_attrs;
225 };
226 #define to_cache_info(device) container_of(device, struct node_cache_info, dev)
227
228 #define CACHE_ATTR(name, fmt) \
229 static ssize_t name##_show(struct device *dev, \
230 struct device_attribute *attr, \
231 char *buf) \
232 { \
233 return sysfs_emit(buf, fmt "\n", \
234 to_cache_info(dev)->cache_attrs.name); \
235 } \
236 DEVICE_ATTR_RO(name);
237
238 CACHE_ATTR(size, "%llu")
239 CACHE_ATTR(line_size, "%u")
240 CACHE_ATTR(indexing, "%u")
241 CACHE_ATTR(write_policy, "%u")
242
243 static struct attribute *cache_attrs[] = {
244 &dev_attr_indexing.attr,
245 &dev_attr_size.attr,
246 &dev_attr_line_size.attr,
247 &dev_attr_write_policy.attr,
248 NULL,
249 };
250 ATTRIBUTE_GROUPS(cache);
251
252 static void node_cache_release(struct device *dev)
253 {
254 kfree(dev);
255 }
256
257 static void node_cacheinfo_release(struct device *dev)
258 {
259 struct node_cache_info *info = to_cache_info(dev);
260 kfree(info);
261 }
262
263 static void node_init_cache_dev(struct node *node)
264 {
265 struct device *dev;
266
267 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
268 if (!dev)
269 return;
270
271 dev->parent = &node->dev;
272 dev->release = node_cache_release;
273 if (dev_set_name(dev, "memory_side_cache"))
274 goto free_dev;
275
276 if (device_register(dev))
277 goto free_name;
278
279 pm_runtime_no_callbacks(dev);
280 node->cache_dev = dev;
281 return;
282 free_name:
283 kfree_const(dev->kobj.name);
284 free_dev:
285 kfree(dev);
286 }
287
288 /**
289 * node_add_cache() - add cache attribute to a memory node
290 * @nid: Node identifier that has new cache attributes
291 * @cache_attrs: Attributes for the cache being added
292 */
293 void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs)
294 {
295 struct node_cache_info *info;
296 struct device *dev;
297 struct node *node;
298
299 if (!node_online(nid) || !node_devices[nid])
300 return;
301
302 node = node_devices[nid];
303 list_for_each_entry(info, &node->cache_attrs, node) {
304 if (info->cache_attrs.level == cache_attrs->level) {
305 dev_warn(&node->dev,
306 "attempt to add duplicate cache level:%d\n",
307 cache_attrs->level);
308 return;
309 }
310 }
311
312 if (!node->cache_dev)
313 node_init_cache_dev(node);
314 if (!node->cache_dev)
315 return;
316
317 info = kzalloc(sizeof(*info), GFP_KERNEL);
318 if (!info)
319 return;
320
321 dev = &info->dev;
322 dev->parent = node->cache_dev;
323 dev->release = node_cacheinfo_release;
324 dev->groups = cache_groups;
325 if (dev_set_name(dev, "index%d", cache_attrs->level))
326 goto free_cache;
327
328 info->cache_attrs = *cache_attrs;
329 if (device_register(dev)) {
330 dev_warn(&node->dev, "failed to add cache level:%d\n",
331 cache_attrs->level);
332 goto free_name;
333 }
334 pm_runtime_no_callbacks(dev);
335 list_add_tail(&info->node, &node->cache_attrs);
336 return;
337 free_name:
338 kfree_const(dev->kobj.name);
339 free_cache:
340 kfree(info);
341 }
342
343 static void node_remove_caches(struct node *node)
344 {
345 struct node_cache_info *info, *next;
346
347 if (!node->cache_dev)
348 return;
349
350 list_for_each_entry_safe(info, next, &node->cache_attrs, node) {
351 list_del(&info->node);
352 device_unregister(&info->dev);
353 }
354 device_unregister(node->cache_dev);
355 }
356
357 static void node_init_caches(unsigned int nid)
358 {
359 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);
360 }
361 #else
362 static void node_init_caches(unsigned int nid) { }
363 static void node_remove_caches(struct node *node) { }
364 #endif
365
366 #define K(x) ((x) << (PAGE_SHIFT - 10))
367 static ssize_t node_read_meminfo(struct device *dev,
368 struct device_attribute *attr, char *buf)
369 {
370 int len = 0;
371 int nid = dev->id;
372 struct pglist_data *pgdat = NODE_DATA(nid);
373 struct sysinfo i;
374 unsigned long sreclaimable, sunreclaimable;
375
376 si_meminfo_node(&i, nid);
377 sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B);
378 sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B);
379 len = sysfs_emit_at(buf, len,
380 "Node %d MemTotal: %8lu kB\n"
381 "Node %d MemFree: %8lu kB\n"
382 "Node %d MemUsed: %8lu kB\n"
383 "Node %d Active: %8lu kB\n"
384 "Node %d Inactive: %8lu kB\n"
385 "Node %d Active(anon): %8lu kB\n"
386 "Node %d Inactive(anon): %8lu kB\n"
387 "Node %d Active(file): %8lu kB\n"
388 "Node %d Inactive(file): %8lu kB\n"
389 "Node %d Unevictable: %8lu kB\n"
390 "Node %d Mlocked: %8lu kB\n",
391 nid, K(i.totalram),
392 nid, K(i.freeram),
393 nid, K(i.totalram - i.freeram),
394 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) +
395 node_page_state(pgdat, NR_ACTIVE_FILE)),
396 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) +
397 node_page_state(pgdat, NR_INACTIVE_FILE)),
398 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)),
399 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)),
400 nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)),
401 nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)),
402 nid, K(node_page_state(pgdat, NR_UNEVICTABLE)),
403 nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
404
405 #ifdef CONFIG_HIGHMEM
406 len += sysfs_emit_at(buf, len,
407 "Node %d HighTotal: %8lu kB\n"
408 "Node %d HighFree: %8lu kB\n"
409 "Node %d LowTotal: %8lu kB\n"
410 "Node %d LowFree: %8lu kB\n",
411 nid, K(i.totalhigh),
412 nid, K(i.freehigh),
413 nid, K(i.totalram - i.totalhigh),
414 nid, K(i.freeram - i.freehigh));
415 #endif
416 len += sysfs_emit_at(buf, len,
417 "Node %d Dirty: %8lu kB\n"
418 "Node %d Writeback: %8lu kB\n"
419 "Node %d FilePages: %8lu kB\n"
420 "Node %d Mapped: %8lu kB\n"
421 "Node %d AnonPages: %8lu kB\n"
422 "Node %d Shmem: %8lu kB\n"
423 "Node %d KernelStack: %8lu kB\n"
424 #ifdef CONFIG_SHADOW_CALL_STACK
425 "Node %d ShadowCallStack:%8lu kB\n"
426 #endif
427 "Node %d PageTables: %8lu kB\n"
428 "Node %d NFS_Unstable: %8lu kB\n"
429 "Node %d Bounce: %8lu kB\n"
430 "Node %d WritebackTmp: %8lu kB\n"
431 "Node %d KReclaimable: %8lu kB\n"
432 "Node %d Slab: %8lu kB\n"
433 "Node %d SReclaimable: %8lu kB\n"
434 "Node %d SUnreclaim: %8lu kB\n"
435 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
436 "Node %d AnonHugePages: %8lu kB\n"
437 "Node %d ShmemHugePages: %8lu kB\n"
438 "Node %d ShmemPmdMapped: %8lu kB\n"
439 "Node %d FileHugePages: %8lu kB\n"
440 "Node %d FilePmdMapped: %8lu kB\n"
441 #endif
442 ,
443 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
444 nid, K(node_page_state(pgdat, NR_WRITEBACK)),
445 nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
446 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
447 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
448 nid, K(i.sharedram),
449 nid, node_page_state(pgdat, NR_KERNEL_STACK_KB),
450 #ifdef CONFIG_SHADOW_CALL_STACK
451 nid, node_page_state(pgdat, NR_KERNEL_SCS_KB),
452 #endif
453 nid, K(node_page_state(pgdat, NR_PAGETABLE)),
454 nid, 0UL,
455 nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
456 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
457 nid, K(sreclaimable +
458 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
459 nid, K(sreclaimable + sunreclaimable),
460 nid, K(sreclaimable),
461 nid, K(sunreclaimable)
462 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
463 ,
464 nid, K(node_page_state(pgdat, NR_ANON_THPS) *
465 HPAGE_PMD_NR),
466 nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
467 HPAGE_PMD_NR),
468 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
469 HPAGE_PMD_NR),
470 nid, K(node_page_state(pgdat, NR_FILE_THPS) *
471 HPAGE_PMD_NR),
472 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) *
473 HPAGE_PMD_NR)
474 #endif
475 );
476 len += hugetlb_report_node_meminfo(buf, len, nid);
477 return len;
478 }
479
480 #undef K
481 static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL);
482
483 static ssize_t node_read_numastat(struct device *dev,
484 struct device_attribute *attr, char *buf)
485 {
486 return sysfs_emit(buf,
487 "numa_hit %lu\n"
488 "numa_miss %lu\n"
489 "numa_foreign %lu\n"
490 "interleave_hit %lu\n"
491 "local_node %lu\n"
492 "other_node %lu\n",
493 sum_zone_numa_state(dev->id, NUMA_HIT),
494 sum_zone_numa_state(dev->id, NUMA_MISS),
495 sum_zone_numa_state(dev->id, NUMA_FOREIGN),
496 sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
497 sum_zone_numa_state(dev->id, NUMA_LOCAL),
498 sum_zone_numa_state(dev->id, NUMA_OTHER));
499 }
500 static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL);
501
502 static ssize_t node_read_vmstat(struct device *dev,
503 struct device_attribute *attr, char *buf)
504 {
505 int nid = dev->id;
506 struct pglist_data *pgdat = NODE_DATA(nid);
507 int i;
508 int len = 0;
509
510 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
511 len += sysfs_emit_at(buf, len, "%s %lu\n",
512 zone_stat_name(i),
513 sum_zone_node_page_state(nid, i));
514
515 #ifdef CONFIG_NUMA
516 for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
517 len += sysfs_emit_at(buf, len, "%s %lu\n",
518 numa_stat_name(i),
519 sum_zone_numa_state(nid, i));
520
521 #endif
522 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
523 len += sysfs_emit_at(buf, len, "%s %lu\n",
524 node_stat_name(i),
525 node_page_state_pages(pgdat, i));
526
527 return len;
528 }
529 static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL);
530
531 static ssize_t node_read_distance(struct device *dev,
532 struct device_attribute *attr, char *buf)
533 {
534 int nid = dev->id;
535 int len = 0;
536 int i;
537
538 /*
539 * buf is currently PAGE_SIZE in length and each node needs 4 chars
540 * at the most (distance + space or newline).
541 */
542 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
543
544 for_each_online_node(i) {
545 len += sysfs_emit_at(buf, len, "%s%d",
546 i ? " " : "", node_distance(nid, i));
547 }
548
549 len += sysfs_emit_at(buf, len, "\n");
550 return len;
551 }
552 static DEVICE_ATTR(distance, 0444, node_read_distance, NULL);
553
554 static struct attribute *node_dev_attrs[] = {
555 &dev_attr_cpumap.attr,
556 &dev_attr_cpulist.attr,
557 &dev_attr_meminfo.attr,
558 &dev_attr_numastat.attr,
559 &dev_attr_distance.attr,
560 &dev_attr_vmstat.attr,
561 NULL
562 };
563 ATTRIBUTE_GROUPS(node_dev);
564
565 #ifdef CONFIG_HUGETLBFS
566 /*
567 * hugetlbfs per node attributes registration interface:
568 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
569 * it will register its per node attributes for all online nodes with
570 * memory. It will also call register_hugetlbfs_with_node(), below, to
571 * register its attribute registration functions with this node driver.
572 * Once these hooks have been initialized, the node driver will call into
573 * the hugetlb module to [un]register attributes for hot-plugged nodes.
574 */
575 static node_registration_func_t __hugetlb_register_node;
576 static node_registration_func_t __hugetlb_unregister_node;
577
578 static inline bool hugetlb_register_node(struct node *node)
579 {
580 if (__hugetlb_register_node &&
581 node_state(node->dev.id, N_MEMORY)) {
582 __hugetlb_register_node(node);
583 return true;
584 }
585 return false;
586 }
587
588 static inline void hugetlb_unregister_node(struct node *node)
589 {
590 if (__hugetlb_unregister_node)
591 __hugetlb_unregister_node(node);
592 }
593
594 void register_hugetlbfs_with_node(node_registration_func_t doregister,
595 node_registration_func_t unregister)
596 {
597 __hugetlb_register_node = doregister;
598 __hugetlb_unregister_node = unregister;
599 }
600 #else
601 static inline void hugetlb_register_node(struct node *node) {}
602
603 static inline void hugetlb_unregister_node(struct node *node) {}
604 #endif
605
606 static void node_device_release(struct device *dev)
607 {
608 struct node *node = to_node(dev);
609
610 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
611 /*
612 * We schedule the work only when a memory section is
613 * onlined/offlined on this node. When we come here,
614 * all the memory on this node has been offlined,
615 * so we won't enqueue new work to this work.
616 *
617 * The work is using node->node_work, so we should
618 * flush work before freeing the memory.
619 */
620 flush_work(&node->node_work);
621 #endif
622 kfree(node);
623 }
624
625 /*
626 * register_node - Setup a sysfs device for a node.
627 * @num - Node number to use when creating the device.
628 *
629 * Initialize and register the node device.
630 */
631 static int register_node(struct node *node, int num)
632 {
633 int error;
634
635 node->dev.id = num;
636 node->dev.bus = &node_subsys;
637 node->dev.release = node_device_release;
638 node->dev.groups = node_dev_groups;
639 error = device_register(&node->dev);
640
641 if (error)
642 put_device(&node->dev);
643 else {
644 hugetlb_register_node(node);
645
646 compaction_register_node(node);
647 }
648 return error;
649 }
650
651 /**
652 * unregister_node - unregister a node device
653 * @node: node going away
654 *
655 * Unregisters a node device @node. All the devices on the node must be
656 * unregistered before calling this function.
657 */
658 void unregister_node(struct node *node)
659 {
660 hugetlb_unregister_node(node); /* no-op, if memoryless node */
661 node_remove_accesses(node);
662 node_remove_caches(node);
663 device_unregister(&node->dev);
664 }
665
666 struct node *node_devices[MAX_NUMNODES];
667
668 /*
669 * register cpu under node
670 */
671 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
672 {
673 int ret;
674 struct device *obj;
675
676 if (!node_online(nid))
677 return 0;
678
679 obj = get_cpu_device(cpu);
680 if (!obj)
681 return 0;
682
683 ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
684 &obj->kobj,
685 kobject_name(&obj->kobj));
686 if (ret)
687 return ret;
688
689 return sysfs_create_link(&obj->kobj,
690 &node_devices[nid]->dev.kobj,
691 kobject_name(&node_devices[nid]->dev.kobj));
692 }
693
694 /**
695 * register_memory_node_under_compute_node - link memory node to its compute
696 * node for a given access class.
697 * @mem_nid: Memory node number
698 * @cpu_nid: Cpu node number
699 * @access: Access class to register
700 *
701 * Description:
702 * For use with platforms that may have separate memory and compute nodes.
703 * This function will export node relationships linking which memory
704 * initiator nodes can access memory targets at a given ranked access
705 * class.
706 */
707 int register_memory_node_under_compute_node(unsigned int mem_nid,
708 unsigned int cpu_nid,
709 unsigned access)
710 {
711 struct node *init_node, *targ_node;
712 struct node_access_nodes *initiator, *target;
713 int ret;
714
715 if (!node_online(cpu_nid) || !node_online(mem_nid))
716 return -ENODEV;
717
718 init_node = node_devices[cpu_nid];
719 targ_node = node_devices[mem_nid];
720 initiator = node_init_node_access(init_node, access);
721 target = node_init_node_access(targ_node, access);
722 if (!initiator || !target)
723 return -ENOMEM;
724
725 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets",
726 &targ_node->dev.kobj,
727 dev_name(&targ_node->dev));
728 if (ret)
729 return ret;
730
731 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators",
732 &init_node->dev.kobj,
733 dev_name(&init_node->dev));
734 if (ret)
735 goto err;
736
737 return 0;
738 err:
739 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets",
740 dev_name(&targ_node->dev));
741 return ret;
742 }
743
744 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
745 {
746 struct device *obj;
747
748 if (!node_online(nid))
749 return 0;
750
751 obj = get_cpu_device(cpu);
752 if (!obj)
753 return 0;
754
755 sysfs_remove_link(&node_devices[nid]->dev.kobj,
756 kobject_name(&obj->kobj));
757 sysfs_remove_link(&obj->kobj,
758 kobject_name(&node_devices[nid]->dev.kobj));
759
760 return 0;
761 }
762
763 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
764 static int __ref get_nid_for_pfn(unsigned long pfn)
765 {
766 if (!pfn_valid_within(pfn))
767 return -1;
768 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
769 if (system_state < SYSTEM_RUNNING)
770 return early_pfn_to_nid(pfn);
771 #endif
772 return pfn_to_nid(pfn);
773 }
774
775 static void do_register_memory_block_under_node(int nid,
776 struct memory_block *mem_blk)
777 {
778 int ret;
779
780 /*
781 * If this memory block spans multiple nodes, we only indicate
782 * the last processed node.
783 */
784 mem_blk->nid = nid;
785
786 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
787 &mem_blk->dev.kobj,
788 kobject_name(&mem_blk->dev.kobj));
789 if (ret && ret != -EEXIST)
790 dev_err_ratelimited(&node_devices[nid]->dev,
791 "can't create link to %s in sysfs (%d)\n",
792 kobject_name(&mem_blk->dev.kobj), ret);
793
794 ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj,
795 &node_devices[nid]->dev.kobj,
796 kobject_name(&node_devices[nid]->dev.kobj));
797 if (ret && ret != -EEXIST)
798 dev_err_ratelimited(&mem_blk->dev,
799 "can't create link to %s in sysfs (%d)\n",
800 kobject_name(&node_devices[nid]->dev.kobj),
801 ret);
802 }
803
804 /* register memory section under specified node if it spans that node */
805 static int register_mem_block_under_node_early(struct memory_block *mem_blk,
806 void *arg)
807 {
808 unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
809 unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
810 unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
811 int nid = *(int *)arg;
812 unsigned long pfn;
813
814 for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
815 int page_nid;
816
817 /*
818 * memory block could have several absent sections from start.
819 * skip pfn range from absent section
820 */
821 if (!pfn_in_present_section(pfn)) {
822 pfn = round_down(pfn + PAGES_PER_SECTION,
823 PAGES_PER_SECTION) - 1;
824 continue;
825 }
826
827 /*
828 * We need to check if page belongs to nid only at the boot
829 * case because node's ranges can be interleaved.
830 */
831 page_nid = get_nid_for_pfn(pfn);
832 if (page_nid < 0)
833 continue;
834 if (page_nid != nid)
835 continue;
836
837 do_register_memory_block_under_node(nid, mem_blk);
838 return 0;
839 }
840 /* mem section does not span the specified node */
841 return 0;
842 }
843
844 /*
845 * During hotplug we know that all pages in the memory block belong to the same
846 * node.
847 */
848 static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk,
849 void *arg)
850 {
851 int nid = *(int *)arg;
852
853 do_register_memory_block_under_node(nid, mem_blk);
854 return 0;
855 }
856
857 /*
858 * Unregister a memory block device under the node it spans. Memory blocks
859 * with multiple nodes cannot be offlined and therefore also never be removed.
860 */
861 void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
862 {
863 if (mem_blk->nid == NUMA_NO_NODE)
864 return;
865
866 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj,
867 kobject_name(&mem_blk->dev.kobj));
868 sysfs_remove_link(&mem_blk->dev.kobj,
869 kobject_name(&node_devices[mem_blk->nid]->dev.kobj));
870 }
871
872 void link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn,
873 enum meminit_context context)
874 {
875 walk_memory_blocks_func_t func;
876
877 if (context == MEMINIT_HOTPLUG)
878 func = register_mem_block_under_node_hotplug;
879 else
880 func = register_mem_block_under_node_early;
881
882 walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
883 (void *)&nid, func);
884 return;
885 }
886
887 #ifdef CONFIG_HUGETLBFS
888 /*
889 * Handle per node hstate attribute [un]registration on transistions
890 * to/from memoryless state.
891 */
892 static void node_hugetlb_work(struct work_struct *work)
893 {
894 struct node *node = container_of(work, struct node, node_work);
895
896 /*
897 * We only get here when a node transitions to/from memoryless state.
898 * We can detect which transition occurred by examining whether the
899 * node has memory now. hugetlb_register_node() already check this
900 * so we try to register the attributes. If that fails, then the
901 * node has transitioned to memoryless, try to unregister the
902 * attributes.
903 */
904 if (!hugetlb_register_node(node))
905 hugetlb_unregister_node(node);
906 }
907
908 static void init_node_hugetlb_work(int nid)
909 {
910 INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
911 }
912
913 static int node_memory_callback(struct notifier_block *self,
914 unsigned long action, void *arg)
915 {
916 struct memory_notify *mnb = arg;
917 int nid = mnb->status_change_nid;
918
919 switch (action) {
920 case MEM_ONLINE:
921 case MEM_OFFLINE:
922 /*
923 * offload per node hstate [un]registration to a work thread
924 * when transitioning to/from memoryless state.
925 */
926 if (nid != NUMA_NO_NODE)
927 schedule_work(&node_devices[nid]->node_work);
928 break;
929
930 case MEM_GOING_ONLINE:
931 case MEM_GOING_OFFLINE:
932 case MEM_CANCEL_ONLINE:
933 case MEM_CANCEL_OFFLINE:
934 default:
935 break;
936 }
937
938 return NOTIFY_OK;
939 }
940 #endif /* CONFIG_HUGETLBFS */
941 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
942
943 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
944 !defined(CONFIG_HUGETLBFS)
945 static inline int node_memory_callback(struct notifier_block *self,
946 unsigned long action, void *arg)
947 {
948 return NOTIFY_OK;
949 }
950
951 static void init_node_hugetlb_work(int nid) { }
952
953 #endif
954
955 int __register_one_node(int nid)
956 {
957 int error;
958 int cpu;
959
960 node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
961 if (!node_devices[nid])
962 return -ENOMEM;
963
964 error = register_node(node_devices[nid], nid);
965
966 /* link cpu under this node */
967 for_each_present_cpu(cpu) {
968 if (cpu_to_node(cpu) == nid)
969 register_cpu_under_node(cpu, nid);
970 }
971
972 INIT_LIST_HEAD(&node_devices[nid]->access_list);
973 /* initialize work queue for memory hot plug */
974 init_node_hugetlb_work(nid);
975 node_init_caches(nid);
976
977 return error;
978 }
979
980 void unregister_one_node(int nid)
981 {
982 if (!node_devices[nid])
983 return;
984
985 unregister_node(node_devices[nid]);
986 node_devices[nid] = NULL;
987 }
988
989 /*
990 * node states attributes
991 */
992
993 struct node_attr {
994 struct device_attribute attr;
995 enum node_states state;
996 };
997
998 static ssize_t show_node_state(struct device *dev,
999 struct device_attribute *attr, char *buf)
1000 {
1001 struct node_attr *na = container_of(attr, struct node_attr, attr);
1002
1003 return sysfs_emit(buf, "%*pbl\n",
1004 nodemask_pr_args(&node_states[na->state]));
1005 }
1006
1007 #define _NODE_ATTR(name, state) \
1008 { __ATTR(name, 0444, show_node_state, NULL), state }
1009
1010 static struct node_attr node_state_attr[] = {
1011 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
1012 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
1013 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
1014 #ifdef CONFIG_HIGHMEM
1015 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
1016 #endif
1017 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
1018 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
1019 [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator,
1020 N_GENERIC_INITIATOR),
1021 };
1022
1023 static struct attribute *node_state_attrs[] = {
1024 &node_state_attr[N_POSSIBLE].attr.attr,
1025 &node_state_attr[N_ONLINE].attr.attr,
1026 &node_state_attr[N_NORMAL_MEMORY].attr.attr,
1027 #ifdef CONFIG_HIGHMEM
1028 &node_state_attr[N_HIGH_MEMORY].attr.attr,
1029 #endif
1030 &node_state_attr[N_MEMORY].attr.attr,
1031 &node_state_attr[N_CPU].attr.attr,
1032 &node_state_attr[N_GENERIC_INITIATOR].attr.attr,
1033 NULL
1034 };
1035
1036 static struct attribute_group memory_root_attr_group = {
1037 .attrs = node_state_attrs,
1038 };
1039
1040 static const struct attribute_group *cpu_root_attr_groups[] = {
1041 &memory_root_attr_group,
1042 NULL,
1043 };
1044
1045 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
1046 static int __init register_node_type(void)
1047 {
1048 int ret;
1049
1050 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
1051 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
1052
1053 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups);
1054 if (!ret) {
1055 static struct notifier_block node_memory_callback_nb = {
1056 .notifier_call = node_memory_callback,
1057 .priority = NODE_CALLBACK_PRI,
1058 };
1059 register_hotmemory_notifier(&node_memory_callback_nb);
1060 }
1061
1062 /*
1063 * Note: we're not going to unregister the node class if we fail
1064 * to register the node state class attribute files.
1065 */
1066 return ret;
1067 }
1068 postcore_initcall(register_node_type);
Linux with added FPC-III support