blob: 91d4087b4039490a844d23e909ffe34eaa0ff0f9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Gary Hadec04fc582009-01-06 14:39:14 -08009#include <linux/memory.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/node.h>
11#include <linux/hugetlb.h>
12#include <linux/cpumask.h>
13#include <linux/topology.h>
14#include <linux/nodemask.h>
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -070015#include <linux/cpu.h>
Lee Schermerhornbde631a2007-10-16 01:26:27 -070016#include <linux/device.h>
Lee Schermerhornaf936a12008-10-18 20:26:53 -070017#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19static struct sysdev_class node_class = {
Kay Sieversaf5ca3f2007-12-20 02:09:39 +010020 .name = "node",
Linus Torvalds1da177e2005-04-16 15:20:36 -070021};
22
23
Mike Travis39106dc2008-04-08 11:43:03 -070024static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025{
26 struct node *node_dev = to_node(dev);
Rusty Russella70f7302009-03-13 14:49:46 +103027 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 int len;
29
Mike Travis39106dc2008-04-08 11:43:03 -070030 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
31 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Mike Travis39106dc2008-04-08 11:43:03 -070033 len = type?
Rusty Russell29c01772008-12-13 21:20:25 +103034 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
35 cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
Mike Travisc5f59f02008-04-04 18:11:10 -070036 buf[len++] = '\n';
37 buf[len] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 return len;
39}
40
Andi Kleen4a0b2b42008-07-01 18:48:41 +020041static inline ssize_t node_read_cpumask(struct sys_device *dev,
42 struct sysdev_attribute *attr, char *buf)
Mike Travis39106dc2008-04-08 11:43:03 -070043{
44 return node_read_cpumap(dev, 0, buf);
45}
Andi Kleen4a0b2b42008-07-01 18:48:41 +020046static inline ssize_t node_read_cpulist(struct sys_device *dev,
47 struct sysdev_attribute *attr, char *buf)
Mike Travis39106dc2008-04-08 11:43:03 -070048{
49 return node_read_cpumap(dev, 1, buf);
50}
51
52static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
53static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55#define K(x) ((x) << (PAGE_SHIFT - 10))
Andi Kleen4a0b2b42008-07-01 18:48:41 +020056static ssize_t node_read_meminfo(struct sys_device * dev,
57 struct sysdev_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
59 int n;
60 int nid = dev->id;
61 struct sysinfo i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63 si_meminfo_node(&i, nid);
Martin Hicksc07e02d2005-09-03 15:55:11 -070064
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 n = sprintf(buf, "\n"
Rik van Riel4f98a2f2008-10-18 20:26:32 -070066 "Node %d MemTotal: %8lu kB\n"
67 "Node %d MemFree: %8lu kB\n"
68 "Node %d MemUsed: %8lu kB\n"
69 "Node %d Active: %8lu kB\n"
70 "Node %d Inactive: %8lu kB\n"
71 "Node %d Active(anon): %8lu kB\n"
72 "Node %d Inactive(anon): %8lu kB\n"
73 "Node %d Active(file): %8lu kB\n"
74 "Node %d Inactive(file): %8lu kB\n"
Nick Piggin5344b7e2008-10-18 20:26:51 -070075 "Node %d Unevictable: %8lu kB\n"
76 "Node %d Mlocked: %8lu kB\n"
Christoph Lameter182e8e22006-09-25 23:31:10 -070077#ifdef CONFIG_HIGHMEM
Rik van Riel4f98a2f2008-10-18 20:26:32 -070078 "Node %d HighTotal: %8lu kB\n"
79 "Node %d HighFree: %8lu kB\n"
80 "Node %d LowTotal: %8lu kB\n"
81 "Node %d LowFree: %8lu kB\n"
Christoph Lameter182e8e22006-09-25 23:31:10 -070082#endif
Rik van Riel4f98a2f2008-10-18 20:26:32 -070083 "Node %d Dirty: %8lu kB\n"
84 "Node %d Writeback: %8lu kB\n"
85 "Node %d FilePages: %8lu kB\n"
86 "Node %d Mapped: %8lu kB\n"
87 "Node %d AnonPages: %8lu kB\n"
88 "Node %d PageTables: %8lu kB\n"
89 "Node %d NFS_Unstable: %8lu kB\n"
90 "Node %d Bounce: %8lu kB\n"
91 "Node %d WritebackTmp: %8lu kB\n"
92 "Node %d Slab: %8lu kB\n"
93 "Node %d SReclaimable: %8lu kB\n"
94 "Node %d SUnreclaim: %8lu kB\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 nid, K(i.totalram),
96 nid, K(i.freeram),
97 nid, K(i.totalram - i.freeram),
Rik van Riel4f98a2f2008-10-18 20:26:32 -070098 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
99 node_page_state(nid, NR_ACTIVE_FILE)),
100 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
101 node_page_state(nid, NR_INACTIVE_FILE)),
102 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
103 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
104 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
105 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
Lee Schermerhorn7b854122008-10-18 20:26:40 -0700106 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
Nick Piggin5344b7e2008-10-18 20:26:51 -0700107 nid, K(node_page_state(nid, NR_MLOCK)),
Christoph Lameter182e8e22006-09-25 23:31:10 -0700108#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 nid, K(i.totalhigh),
110 nid, K(i.freehigh),
111 nid, K(i.totalram - i.totalhigh),
Martin Hicksc07e02d2005-09-03 15:55:11 -0700112 nid, K(i.freeram - i.freehigh),
Christoph Lameter182e8e22006-09-25 23:31:10 -0700113#endif
Christoph Lameterb1e7a8f2006-06-30 01:55:39 -0700114 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
Christoph Lameterce866b32006-06-30 01:55:40 -0700115 nid, K(node_page_state(nid, NR_WRITEBACK)),
Christoph Lameter347ce432006-06-30 01:55:35 -0700116 nid, K(node_page_state(nid, NR_FILE_PAGES)),
Christoph Lameter65ba55f2006-06-30 01:55:34 -0700117 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
Christoph Lameterf3dbd342006-06-30 01:55:36 -0700118 nid, K(node_page_state(nid, NR_ANON_PAGES)),
Christoph Lameterdf849a12006-06-30 01:55:38 -0700119 nid, K(node_page_state(nid, NR_PAGETABLE)),
Christoph Lameterfd39fc82006-06-30 01:55:40 -0700120 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
Christoph Lameterd2c5e302006-06-30 01:55:41 -0700121 nid, K(node_page_state(nid, NR_BOUNCE)),
Miklos Szeredifc3ba692008-04-30 00:54:38 -0700122 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
Christoph Lameter972d1a72006-09-25 23:31:51 -0700123 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
124 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
125 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
126 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 n += hugetlb_report_node_meminfo(nid, buf + n);
128 return n;
129}
130
131#undef K
132static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
133
Andi Kleen4a0b2b42008-07-01 18:48:41 +0200134static ssize_t node_read_numastat(struct sys_device * dev,
135 struct sysdev_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return sprintf(buf,
138 "numa_hit %lu\n"
139 "numa_miss %lu\n"
140 "numa_foreign %lu\n"
141 "interleave_hit %lu\n"
142 "local_node %lu\n"
143 "other_node %lu\n",
Christoph Lameterca889e62006-06-30 01:55:44 -0700144 node_page_state(dev->id, NUMA_HIT),
145 node_page_state(dev->id, NUMA_MISS),
146 node_page_state(dev->id, NUMA_FOREIGN),
147 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
148 node_page_state(dev->id, NUMA_LOCAL),
149 node_page_state(dev->id, NUMA_OTHER));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
152
Andi Kleen4a0b2b42008-07-01 18:48:41 +0200153static ssize_t node_read_distance(struct sys_device * dev,
154 struct sysdev_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
156 int nid = dev->id;
157 int len = 0;
158 int i;
159
160 /* buf currently PAGE_SIZE, need ~4 chars per node */
161 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
162
163 for_each_online_node(i)
164 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
165
166 len += sprintf(buf + len, "\n");
167 return len;
168}
169static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
170
171
172/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100173 * register_node - Setup a sysfs device for a node.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 * @num - Node number to use when creating the device.
175 *
176 * Initialize and register the node device.
177 */
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900178int register_node(struct node *node, int num, struct node *parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
180 int error;
181
182 node->sysdev.id = num;
183 node->sysdev.cls = &node_class;
184 error = sysdev_register(&node->sysdev);
185
186 if (!error){
187 sysdev_create_file(&node->sysdev, &attr_cpumap);
Mike Travis39106dc2008-04-08 11:43:03 -0700188 sysdev_create_file(&node->sysdev, &attr_cpulist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 sysdev_create_file(&node->sysdev, &attr_meminfo);
190 sysdev_create_file(&node->sysdev, &attr_numastat);
191 sysdev_create_file(&node->sysdev, &attr_distance);
Lee Schermerhornaf936a12008-10-18 20:26:53 -0700192
193 scan_unevictable_register_node(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
195 return error;
196}
197
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900198/**
199 * unregister_node - unregister a node device
200 * @node: node going away
201 *
202 * Unregisters a node device @node. All the devices on the node must be
203 * unregistered before calling this function.
204 */
205void unregister_node(struct node *node)
206{
207 sysdev_remove_file(&node->sysdev, &attr_cpumap);
Mike Travis39106dc2008-04-08 11:43:03 -0700208 sysdev_remove_file(&node->sysdev, &attr_cpulist);
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900209 sysdev_remove_file(&node->sysdev, &attr_meminfo);
210 sysdev_remove_file(&node->sysdev, &attr_numastat);
211 sysdev_remove_file(&node->sysdev, &attr_distance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Lee Schermerhornaf936a12008-10-18 20:26:53 -0700213 scan_unevictable_unregister_node(node);
214
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900215 sysdev_unregister(&node->sysdev);
216}
217
Yasunori Goto0fc44152006-06-27 02:53:38 -0700218struct node node_devices[MAX_NUMNODES];
219
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -0700220/*
221 * register cpu under node
222 */
223int register_cpu_under_node(unsigned int cpu, unsigned int nid)
224{
225 if (node_online(nid)) {
226 struct sys_device *obj = get_cpu_sysdev(cpu);
227 if (!obj)
228 return 0;
229 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
230 &obj->kobj,
231 kobject_name(&obj->kobj));
232 }
233
234 return 0;
235}
236
237int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
238{
239 if (node_online(nid)) {
240 struct sys_device *obj = get_cpu_sysdev(cpu);
241 if (obj)
242 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
243 kobject_name(&obj->kobj));
244 }
245 return 0;
246}
247
Gary Hadec04fc582009-01-06 14:39:14 -0800248#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
249#define page_initialized(page) (page->lru.next)
250
251static int get_nid_for_pfn(unsigned long pfn)
252{
253 struct page *page;
254
255 if (!pfn_valid_within(pfn))
256 return -1;
257 page = pfn_to_page(pfn);
258 if (!page_initialized(page))
259 return -1;
260 return pfn_to_nid(pfn);
261}
262
263/* register memory section under specified node if it spans that node */
264int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
265{
266 unsigned long pfn, sect_start_pfn, sect_end_pfn;
267
268 if (!mem_blk)
269 return -EFAULT;
270 if (!node_online(nid))
271 return 0;
272 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
273 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
274 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
275 int page_nid;
276
277 page_nid = get_nid_for_pfn(pfn);
278 if (page_nid < 0)
279 continue;
280 if (page_nid != nid)
281 continue;
282 return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
283 &mem_blk->sysdev.kobj,
284 kobject_name(&mem_blk->sysdev.kobj));
285 }
286 /* mem section does not span the specified node */
287 return 0;
288}
289
290/* unregister memory section under all nodes that it spans */
291int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
292{
293 nodemask_t unlinked_nodes;
294 unsigned long pfn, sect_start_pfn, sect_end_pfn;
295
296 if (!mem_blk)
297 return -EFAULT;
298 nodes_clear(unlinked_nodes);
299 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
300 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
301 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
Roel Kluin47504982009-03-10 12:55:45 -0700302 int nid;
Gary Hadec04fc582009-01-06 14:39:14 -0800303
304 nid = get_nid_for_pfn(pfn);
305 if (nid < 0)
306 continue;
307 if (!node_online(nid))
308 continue;
309 if (node_test_and_set(nid, unlinked_nodes))
310 continue;
311 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
312 kobject_name(&mem_blk->sysdev.kobj));
313 }
314 return 0;
315}
316
317static int link_mem_sections(int nid)
318{
319 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
320 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
321 unsigned long pfn;
322 int err = 0;
323
324 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
325 unsigned long section_nr = pfn_to_section_nr(pfn);
326 struct mem_section *mem_sect;
327 struct memory_block *mem_blk;
328 int ret;
329
330 if (!present_section_nr(section_nr))
331 continue;
332 mem_sect = __nr_to_section(section_nr);
333 mem_blk = find_memory_block(mem_sect);
334 ret = register_mem_sect_under_node(mem_blk, nid);
335 if (!err)
336 err = ret;
337
338 /* discard ref obtained in find_memory_block() */
339 kobject_put(&mem_blk->sysdev.kobj);
340 }
341 return err;
342}
343#else
344static int link_mem_sections(int nid) { return 0; }
345#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
346
Yasunori Goto0fc44152006-06-27 02:53:38 -0700347int register_one_node(int nid)
348{
349 int error = 0;
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -0700350 int cpu;
Yasunori Goto0fc44152006-06-27 02:53:38 -0700351
352 if (node_online(nid)) {
353 int p_node = parent_node(nid);
354 struct node *parent = NULL;
355
356 if (p_node != nid)
357 parent = &node_devices[p_node];
358
359 error = register_node(&node_devices[nid], nid, parent);
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -0700360
361 /* link cpu under this node */
362 for_each_present_cpu(cpu) {
363 if (cpu_to_node(cpu) == nid)
364 register_cpu_under_node(cpu, nid);
365 }
Gary Hadec04fc582009-01-06 14:39:14 -0800366
367 /* link memory sections under this node */
368 error = link_mem_sections(nid);
Yasunori Goto0fc44152006-06-27 02:53:38 -0700369 }
370
371 return error;
372
373}
374
375void unregister_one_node(int nid)
376{
377 unregister_node(&node_devices[nid]);
378}
379
Lee Schermerhornbde631a2007-10-16 01:26:27 -0700380/*
381 * node states attributes
382 */
383
384static ssize_t print_nodes_state(enum node_states state, char *buf)
385{
386 int n;
387
388 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
389 if (n > 0 && PAGE_SIZE > n + 1) {
390 *(buf + n++) = '\n';
391 *(buf + n++) = '\0';
392 }
393 return n;
394}
395
396static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
397{
398 return print_nodes_state(N_POSSIBLE, buf);
399}
400
401static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
402{
403 return print_nodes_state(N_ONLINE, buf);
404}
405
406static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
407 char *buf)
408{
409 return print_nodes_state(N_NORMAL_MEMORY, buf);
410}
411
412static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
413{
414 return print_nodes_state(N_CPU, buf);
415}
416
417static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
418static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
419static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
420 NULL);
421static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
422
423#ifdef CONFIG_HIGHMEM
424static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
425 char *buf)
426{
427 return print_nodes_state(N_HIGH_MEMORY, buf);
428}
429
430static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
431 NULL);
432#endif
433
434struct sysdev_class_attribute *node_state_attr[] = {
435 &attr_possible,
436 &attr_online,
437 &attr_has_normal_memory,
438#ifdef CONFIG_HIGHMEM
439 &attr_has_high_memory,
440#endif
441 &attr_has_cpu,
442};
443
444static int node_states_init(void)
445{
446 int i;
447 int err = 0;
448
449 for (i = 0; i < NR_NODE_STATES; i++) {
450 int ret;
451 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
452 if (!err)
453 err = ret;
454 }
455 return err;
456}
457
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900458static int __init register_node_type(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
Lee Schermerhornbde631a2007-10-16 01:26:27 -0700460 int ret;
461
462 ret = sysdev_class_register(&node_class);
463 if (!ret)
464 ret = node_states_init();
465
466 /*
467 * Note: we're not going to unregister the node class if we fail
468 * to register the node state class attribute files.
469 */
470 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472postcore_initcall(register_node_type);