nodemask: include slab.h from drivers/base/node.c
[linux-2.6.git] / drivers / base / node.c
1 /*
2  * drivers/base/node.c - basic Node class support
3  */
4
5 #include <linux/sysdev.h>
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/mm.h>
9 #include <linux/memory.h>
10 #include <linux/node.h>
11 #include <linux/hugetlb.h>
12 #include <linux/cpumask.h>
13 #include <linux/topology.h>
14 #include <linux/nodemask.h>
15 #include <linux/cpu.h>
16 #include <linux/device.h>
17 #include <linux/swap.h>
18 #include <linux/slab.h>
19
20 static struct sysdev_class_attribute *node_state_attrs[];
21
22 static struct sysdev_class node_class = {
23         .name = "node",
24         .attrs = node_state_attrs,
25 };
26
27
28 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
29 {
30         struct node *node_dev = to_node(dev);
31         const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
32         int len;
33
34         /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
35         BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
36
37         len = type?
38                 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
39                 cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
40         buf[len++] = '\n';
41         buf[len] = '\0';
42         return len;
43 }
44
45 static inline ssize_t node_read_cpumask(struct sys_device *dev,
46                                 struct sysdev_attribute *attr, char *buf)
47 {
48         return node_read_cpumap(dev, 0, buf);
49 }
50 static inline ssize_t node_read_cpulist(struct sys_device *dev,
51                                 struct sysdev_attribute *attr, char *buf)
52 {
53         return node_read_cpumap(dev, 1, buf);
54 }
55
56 static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
57 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
58
59 #define K(x) ((x) << (PAGE_SHIFT - 10))
60 static ssize_t node_read_meminfo(struct sys_device * dev,
61                         struct sysdev_attribute *attr, char * buf)
62 {
63         int n;
64         int nid = dev->id;
65         struct sysinfo i;
66
67         si_meminfo_node(&i, nid);
68
69         n = sprintf(buf, "\n"
70                        "Node %d MemTotal:       %8lu kB\n"
71                        "Node %d MemFree:        %8lu kB\n"
72                        "Node %d MemUsed:        %8lu kB\n"
73                        "Node %d Active:         %8lu kB\n"
74                        "Node %d Inactive:       %8lu kB\n"
75                        "Node %d Active(anon):   %8lu kB\n"
76                        "Node %d Inactive(anon): %8lu kB\n"
77                        "Node %d Active(file):   %8lu kB\n"
78                        "Node %d Inactive(file): %8lu kB\n"
79                        "Node %d Unevictable:    %8lu kB\n"
80                        "Node %d Mlocked:        %8lu kB\n"
81 #ifdef CONFIG_HIGHMEM
82                        "Node %d HighTotal:      %8lu kB\n"
83                        "Node %d HighFree:       %8lu kB\n"
84                        "Node %d LowTotal:       %8lu kB\n"
85                        "Node %d LowFree:        %8lu kB\n"
86 #endif
87                        "Node %d Dirty:          %8lu kB\n"
88                        "Node %d Writeback:      %8lu kB\n"
89                        "Node %d FilePages:      %8lu kB\n"
90                        "Node %d Mapped:         %8lu kB\n"
91                        "Node %d AnonPages:      %8lu kB\n"
92                        "Node %d Shmem:          %8lu kB\n"
93                        "Node %d KernelStack:    %8lu kB\n"
94                        "Node %d PageTables:     %8lu kB\n"
95                        "Node %d NFS_Unstable:   %8lu kB\n"
96                        "Node %d Bounce:         %8lu kB\n"
97                        "Node %d WritebackTmp:   %8lu kB\n"
98                        "Node %d Slab:           %8lu kB\n"
99                        "Node %d SReclaimable:   %8lu kB\n"
100                        "Node %d SUnreclaim:     %8lu kB\n",
101                        nid, K(i.totalram),
102                        nid, K(i.freeram),
103                        nid, K(i.totalram - i.freeram),
104                        nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
105                                 node_page_state(nid, NR_ACTIVE_FILE)),
106                        nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
107                                 node_page_state(nid, NR_INACTIVE_FILE)),
108                        nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
109                        nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
110                        nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
111                        nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
112                        nid, K(node_page_state(nid, NR_UNEVICTABLE)),
113                        nid, K(node_page_state(nid, NR_MLOCK)),
114 #ifdef CONFIG_HIGHMEM
115                        nid, K(i.totalhigh),
116                        nid, K(i.freehigh),
117                        nid, K(i.totalram - i.totalhigh),
118                        nid, K(i.freeram - i.freehigh),
119 #endif
120                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
121                        nid, K(node_page_state(nid, NR_WRITEBACK)),
122                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
123                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
124                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
125                        nid, K(node_page_state(nid, NR_SHMEM)),
126                        nid, node_page_state(nid, NR_KERNEL_STACK) *
127                                 THREAD_SIZE / 1024,
128                        nid, K(node_page_state(nid, NR_PAGETABLE)),
129                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
130                        nid, K(node_page_state(nid, NR_BOUNCE)),
131                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
132                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
133                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
134                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
135                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
136         n += hugetlb_report_node_meminfo(nid, buf + n);
137         return n;
138 }
139
140 #undef K
141 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
142
143 static ssize_t node_read_numastat(struct sys_device * dev,
144                                 struct sysdev_attribute *attr, char * buf)
145 {
146         return sprintf(buf,
147                        "numa_hit %lu\n"
148                        "numa_miss %lu\n"
149                        "numa_foreign %lu\n"
150                        "interleave_hit %lu\n"
151                        "local_node %lu\n"
152                        "other_node %lu\n",
153                        node_page_state(dev->id, NUMA_HIT),
154                        node_page_state(dev->id, NUMA_MISS),
155                        node_page_state(dev->id, NUMA_FOREIGN),
156                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
157                        node_page_state(dev->id, NUMA_LOCAL),
158                        node_page_state(dev->id, NUMA_OTHER));
159 }
160 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
161
162 static ssize_t node_read_distance(struct sys_device * dev,
163                         struct sysdev_attribute *attr, char * buf)
164 {
165         int nid = dev->id;
166         int len = 0;
167         int i;
168
169         /*
170          * buf is currently PAGE_SIZE in length and each node needs 4 chars
171          * at the most (distance + space or newline).
172          */
173         BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
174
175         for_each_online_node(i)
176                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
177
178         len += sprintf(buf + len, "\n");
179         return len;
180 }
181 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
182
183 #ifdef CONFIG_HUGETLBFS
184 /*
185  * hugetlbfs per node attributes registration interface:
186  * When/if hugetlb[fs] subsystem initializes [sometime after this module],
187  * it will register its per node attributes for all online nodes with
188  * memory.  It will also call register_hugetlbfs_with_node(), below, to
189  * register its attribute registration functions with this node driver.
190  * Once these hooks have been initialized, the node driver will call into
191  * the hugetlb module to [un]register attributes for hot-plugged nodes.
192  */
193 static node_registration_func_t __hugetlb_register_node;
194 static node_registration_func_t __hugetlb_unregister_node;
195
196 static inline bool hugetlb_register_node(struct node *node)
197 {
198         if (__hugetlb_register_node &&
199                         node_state(node->sysdev.id, N_HIGH_MEMORY)) {
200                 __hugetlb_register_node(node);
201                 return true;
202         }
203         return false;
204 }
205
206 static inline void hugetlb_unregister_node(struct node *node)
207 {
208         if (__hugetlb_unregister_node)
209                 __hugetlb_unregister_node(node);
210 }
211
212 void register_hugetlbfs_with_node(node_registration_func_t doregister,
213                                   node_registration_func_t unregister)
214 {
215         __hugetlb_register_node   = doregister;
216         __hugetlb_unregister_node = unregister;
217 }
218 #else
219 static inline void hugetlb_register_node(struct node *node) {}
220
221 static inline void hugetlb_unregister_node(struct node *node) {}
222 #endif
223
224
225 /*
226  * register_node - Setup a sysfs device for a node.
227  * @num - Node number to use when creating the device.
228  *
229  * Initialize and register the node device.
230  */
231 int register_node(struct node *node, int num, struct node *parent)
232 {
233         int error;
234
235         node->sysdev.id = num;
236         node->sysdev.cls = &node_class;
237         error = sysdev_register(&node->sysdev);
238
239         if (!error){
240                 sysdev_create_file(&node->sysdev, &attr_cpumap);
241                 sysdev_create_file(&node->sysdev, &attr_cpulist);
242                 sysdev_create_file(&node->sysdev, &attr_meminfo);
243                 sysdev_create_file(&node->sysdev, &attr_numastat);
244                 sysdev_create_file(&node->sysdev, &attr_distance);
245
246                 scan_unevictable_register_node(node);
247
248                 hugetlb_register_node(node);
249         }
250         return error;
251 }
252
253 /**
254  * unregister_node - unregister a node device
255  * @node: node going away
256  *
257  * Unregisters a node device @node.  All the devices on the node must be
258  * unregistered before calling this function.
259  */
260 void unregister_node(struct node *node)
261 {
262         sysdev_remove_file(&node->sysdev, &attr_cpumap);
263         sysdev_remove_file(&node->sysdev, &attr_cpulist);
264         sysdev_remove_file(&node->sysdev, &attr_meminfo);
265         sysdev_remove_file(&node->sysdev, &attr_numastat);
266         sysdev_remove_file(&node->sysdev, &attr_distance);
267
268         scan_unevictable_unregister_node(node);
269         hugetlb_unregister_node(node);          /* no-op, if memoryless node */
270
271         sysdev_unregister(&node->sysdev);
272 }
273
274 struct node node_devices[MAX_NUMNODES];
275
276 /*
277  * register cpu under node
278  */
279 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
280 {
281         int ret;
282         struct sys_device *obj;
283
284         if (!node_online(nid))
285                 return 0;
286
287         obj = get_cpu_sysdev(cpu);
288         if (!obj)
289                 return 0;
290
291         ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
292                                 &obj->kobj,
293                                 kobject_name(&obj->kobj));
294         if (ret)
295                 return ret;
296
297         return sysfs_create_link(&obj->kobj,
298                                  &node_devices[nid].sysdev.kobj,
299                                  kobject_name(&node_devices[nid].sysdev.kobj));
300 }
301
302 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
303 {
304         struct sys_device *obj;
305
306         if (!node_online(nid))
307                 return 0;
308
309         obj = get_cpu_sysdev(cpu);
310         if (!obj)
311                 return 0;
312
313         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
314                           kobject_name(&obj->kobj));
315         sysfs_remove_link(&obj->kobj,
316                           kobject_name(&node_devices[nid].sysdev.kobj));
317
318         return 0;
319 }
320
321 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
322 #define page_initialized(page)  (page->lru.next)
323
324 static int get_nid_for_pfn(unsigned long pfn)
325 {
326         struct page *page;
327
328         if (!pfn_valid_within(pfn))
329                 return -1;
330         page = pfn_to_page(pfn);
331         if (!page_initialized(page))
332                 return -1;
333         return pfn_to_nid(pfn);
334 }
335
336 /* register memory section under specified node if it spans that node */
337 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
338 {
339         int ret;
340         unsigned long pfn, sect_start_pfn, sect_end_pfn;
341
342         if (!mem_blk)
343                 return -EFAULT;
344         if (!node_online(nid))
345                 return 0;
346         sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
347         sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
348         for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
349                 int page_nid;
350
351                 page_nid = get_nid_for_pfn(pfn);
352                 if (page_nid < 0)
353                         continue;
354                 if (page_nid != nid)
355                         continue;
356                 ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
357                                         &mem_blk->sysdev.kobj,
358                                         kobject_name(&mem_blk->sysdev.kobj));
359                 if (ret)
360                         return ret;
361
362                 return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj,
363                                 &node_devices[nid].sysdev.kobj,
364                                 kobject_name(&node_devices[nid].sysdev.kobj));
365         }
366         /* mem section does not span the specified node */
367         return 0;
368 }
369
370 /* unregister memory section under all nodes that it spans */
371 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
372 {
373         NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
374         unsigned long pfn, sect_start_pfn, sect_end_pfn;
375
376         if (!mem_blk) {
377                 NODEMASK_FREE(unlinked_nodes);
378                 return -EFAULT;
379         }
380         if (!unlinked_nodes)
381                 return -ENOMEM;
382         nodes_clear(*unlinked_nodes);
383         sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
384         sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
385         for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
386                 int nid;
387
388                 nid = get_nid_for_pfn(pfn);
389                 if (nid < 0)
390                         continue;
391                 if (!node_online(nid))
392                         continue;
393                 if (node_test_and_set(nid, *unlinked_nodes))
394                         continue;
395                 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
396                          kobject_name(&mem_blk->sysdev.kobj));
397                 sysfs_remove_link(&mem_blk->sysdev.kobj,
398                          kobject_name(&node_devices[nid].sysdev.kobj));
399         }
400         NODEMASK_FREE(unlinked_nodes);
401         return 0;
402 }
403
404 static int link_mem_sections(int nid)
405 {
406         unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
407         unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
408         unsigned long pfn;
409         int err = 0;
410
411         for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
412                 unsigned long section_nr = pfn_to_section_nr(pfn);
413                 struct mem_section *mem_sect;
414                 struct memory_block *mem_blk;
415                 int ret;
416
417                 if (!present_section_nr(section_nr))
418                         continue;
419                 mem_sect = __nr_to_section(section_nr);
420                 mem_blk = find_memory_block(mem_sect);
421                 ret = register_mem_sect_under_node(mem_blk, nid);
422                 if (!err)
423                         err = ret;
424
425                 /* discard ref obtained in find_memory_block() */
426                 kobject_put(&mem_blk->sysdev.kobj);
427         }
428         return err;
429 }
430
431 #ifdef CONFIG_HUGETLBFS
432 /*
433  * Handle per node hstate attribute [un]registration on transistions
434  * to/from memoryless state.
435  */
436 static void node_hugetlb_work(struct work_struct *work)
437 {
438         struct node *node = container_of(work, struct node, node_work);
439
440         /*
441          * We only get here when a node transitions to/from memoryless state.
442          * We can detect which transition occurred by examining whether the
443          * node has memory now.  hugetlb_register_node() already check this
444          * so we try to register the attributes.  If that fails, then the
445          * node has transitioned to memoryless, try to unregister the
446          * attributes.
447          */
448         if (!hugetlb_register_node(node))
449                 hugetlb_unregister_node(node);
450 }
451
452 static void init_node_hugetlb_work(int nid)
453 {
454         INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work);
455 }
456
457 static int node_memory_callback(struct notifier_block *self,
458                                 unsigned long action, void *arg)
459 {
460         struct memory_notify *mnb = arg;
461         int nid = mnb->status_change_nid;
462
463         switch (action) {
464         case MEM_ONLINE:
465         case MEM_OFFLINE:
466                 /*
467                  * offload per node hstate [un]registration to a work thread
468                  * when transitioning to/from memoryless state.
469                  */
470                 if (nid != NUMA_NO_NODE)
471                         schedule_work(&node_devices[nid].node_work);
472                 break;
473
474         case MEM_GOING_ONLINE:
475         case MEM_GOING_OFFLINE:
476         case MEM_CANCEL_ONLINE:
477         case MEM_CANCEL_OFFLINE:
478         default:
479                 break;
480         }
481
482         return NOTIFY_OK;
483 }
484 #endif  /* CONFIG_HUGETLBFS */
485 #else   /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
486
487 static int link_mem_sections(int nid) { return 0; }
488 #endif  /* CONFIG_MEMORY_HOTPLUG_SPARSE */
489
490 #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
491     !defined(CONFIG_HUGETLBFS)
492 static inline int node_memory_callback(struct notifier_block *self,
493                                 unsigned long action, void *arg)
494 {
495         return NOTIFY_OK;
496 }
497
498 static void init_node_hugetlb_work(int nid) { }
499
500 #endif
501
502 int register_one_node(int nid)
503 {
504         int error = 0;
505         int cpu;
506
507         if (node_online(nid)) {
508                 int p_node = parent_node(nid);
509                 struct node *parent = NULL;
510
511                 if (p_node != nid)
512                         parent = &node_devices[p_node];
513
514                 error = register_node(&node_devices[nid], nid, parent);
515
516                 /* link cpu under this node */
517                 for_each_present_cpu(cpu) {
518                         if (cpu_to_node(cpu) == nid)
519                                 register_cpu_under_node(cpu, nid);
520                 }
521
522                 /* link memory sections under this node */
523                 error = link_mem_sections(nid);
524
525                 /* initialize work queue for memory hot plug */
526                 init_node_hugetlb_work(nid);
527         }
528
529         return error;
530
531 }
532
533 void unregister_one_node(int nid)
534 {
535         unregister_node(&node_devices[nid]);
536 }
537
538 /*
539  * node states attributes
540  */
541
542 static ssize_t print_nodes_state(enum node_states state, char *buf)
543 {
544         int n;
545
546         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
547         if (n > 0 && PAGE_SIZE > n + 1) {
548                 *(buf + n++) = '\n';
549                 *(buf + n++) = '\0';
550         }
551         return n;
552 }
553
554 struct node_attr {
555         struct sysdev_class_attribute attr;
556         enum node_states state;
557 };
558
559 static ssize_t show_node_state(struct sysdev_class *class,
560                                struct sysdev_class_attribute *attr, char *buf)
561 {
562         struct node_attr *na = container_of(attr, struct node_attr, attr);
563         return print_nodes_state(na->state, buf);
564 }
565
566 #define _NODE_ATTR(name, state) \
567         { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state }
568
569 static struct node_attr node_state_attr[] = {
570         _NODE_ATTR(possible, N_POSSIBLE),
571         _NODE_ATTR(online, N_ONLINE),
572         _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
573         _NODE_ATTR(has_cpu, N_CPU),
574 #ifdef CONFIG_HIGHMEM
575         _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
576 #endif
577 };
578
579 static struct sysdev_class_attribute *node_state_attrs[] = {
580         &node_state_attr[0].attr,
581         &node_state_attr[1].attr,
582         &node_state_attr[2].attr,
583         &node_state_attr[3].attr,
584 #ifdef CONFIG_HIGHMEM
585         &node_state_attr[4].attr,
586 #endif
587         NULL
588 };
589
590 #define NODE_CALLBACK_PRI       2       /* lower than SLAB */
591 static int __init register_node_type(void)
592 {
593         int ret;
594
595         BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES);
596         BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
597
598         ret = sysdev_class_register(&node_class);
599         if (!ret) {
600                 hotplug_memory_notifier(node_memory_callback,
601                                         NODE_CALLBACK_PRI);
602         }
603
604         /*
605          * Note:  we're not going to unregister the node class if we fail
606          * to register the node state class attribute files.
607          */
608         return ret;
609 }
610 postcore_initcall(register_node_type);