2 * drivers/base/node.c - basic Node class support
5 #include <linux/sysdev.h>
6 #include <linux/module.h>
7 #include <linux/init.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>
19 static struct sysdev_class node_class = {
24 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
26 struct node *node_dev = to_node(dev);
27 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
30 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
31 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
34 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
35 cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
41 static inline ssize_t node_read_cpumask(struct sys_device *dev,
42 struct sysdev_attribute *attr, char *buf)
44 return node_read_cpumap(dev, 0, buf);
46 static inline ssize_t node_read_cpulist(struct sys_device *dev,
47 struct sysdev_attribute *attr, char *buf)
49 return node_read_cpumap(dev, 1, buf);
52 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
53 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
55 #define K(x) ((x) << (PAGE_SHIFT - 10))
56 static ssize_t node_read_meminfo(struct sys_device * dev,
57 struct sysdev_attribute *attr, char * buf)
63 si_meminfo_node(&i, nid);
66 "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"
75 "Node %d Unevictable: %8lu kB\n"
76 "Node %d Mlocked: %8lu kB\n"
78 "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"
83 "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 Shmem: %8lu kB\n"
89 "Node %d KernelStack: %8lu kB\n"
90 "Node %d PageTables: %8lu kB\n"
91 "Node %d NFS_Unstable: %8lu kB\n"
92 "Node %d Bounce: %8lu kB\n"
93 "Node %d WritebackTmp: %8lu kB\n"
94 "Node %d Slab: %8lu kB\n"
95 "Node %d SReclaimable: %8lu kB\n"
96 "Node %d SUnreclaim: %8lu kB\n",
99 nid, K(i.totalram - i.freeram),
100 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
101 node_page_state(nid, NR_ACTIVE_FILE)),
102 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
103 node_page_state(nid, NR_INACTIVE_FILE)),
104 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
105 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
106 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
107 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
108 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
109 nid, K(node_page_state(nid, NR_MLOCK)),
110 #ifdef CONFIG_HIGHMEM
113 nid, K(i.totalram - i.totalhigh),
114 nid, K(i.freeram - i.freehigh),
116 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
117 nid, K(node_page_state(nid, NR_WRITEBACK)),
118 nid, K(node_page_state(nid, NR_FILE_PAGES)),
119 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
120 nid, K(node_page_state(nid, NR_ANON_PAGES)),
121 nid, K(node_page_state(nid, NR_SHMEM)),
122 nid, node_page_state(nid, NR_KERNEL_STACK) *
124 nid, K(node_page_state(nid, NR_PAGETABLE)),
125 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
126 nid, K(node_page_state(nid, NR_BOUNCE)),
127 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
128 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
129 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
130 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
131 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
132 n += hugetlb_report_node_meminfo(nid, buf + n);
137 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
139 static ssize_t node_read_numastat(struct sys_device * dev,
140 struct sysdev_attribute *attr, char * buf)
146 "interleave_hit %lu\n"
149 node_page_state(dev->id, NUMA_HIT),
150 node_page_state(dev->id, NUMA_MISS),
151 node_page_state(dev->id, NUMA_FOREIGN),
152 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
153 node_page_state(dev->id, NUMA_LOCAL),
154 node_page_state(dev->id, NUMA_OTHER));
156 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
158 static ssize_t node_read_distance(struct sys_device * dev,
159 struct sysdev_attribute *attr, char * buf)
165 /* buf currently PAGE_SIZE, need ~4 chars per node */
166 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
168 for_each_online_node(i)
169 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
171 len += sprintf(buf + len, "\n");
174 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
176 #ifdef CONFIG_HUGETLBFS
178 * hugetlbfs per node attributes registration interface:
179 * When/if hugetlb[fs] subsystem initializes [sometime after this module],
180 * it will register its per node attributes for all online nodes with
181 * memory. It will also call register_hugetlbfs_with_node(), below, to
182 * register its attribute registration functions with this node driver.
183 * Once these hooks have been initialized, the node driver will call into
184 * the hugetlb module to [un]register attributes for hot-plugged nodes.
186 static node_registration_func_t __hugetlb_register_node;
187 static node_registration_func_t __hugetlb_unregister_node;
189 static inline void hugetlb_register_node(struct node *node)
191 if (__hugetlb_register_node &&
192 node_state(node->sysdev.id, N_HIGH_MEMORY))
193 __hugetlb_register_node(node);
196 static inline void hugetlb_unregister_node(struct node *node)
198 if (__hugetlb_unregister_node)
199 __hugetlb_unregister_node(node);
202 void register_hugetlbfs_with_node(node_registration_func_t doregister,
203 node_registration_func_t unregister)
205 __hugetlb_register_node = doregister;
206 __hugetlb_unregister_node = unregister;
209 static inline void hugetlb_register_node(struct node *node) {}
211 static inline void hugetlb_unregister_node(struct node *node) {}
216 * register_node - Setup a sysfs device for a node.
217 * @num - Node number to use when creating the device.
219 * Initialize and register the node device.
221 int register_node(struct node *node, int num, struct node *parent)
225 node->sysdev.id = num;
226 node->sysdev.cls = &node_class;
227 error = sysdev_register(&node->sysdev);
230 sysdev_create_file(&node->sysdev, &attr_cpumap);
231 sysdev_create_file(&node->sysdev, &attr_cpulist);
232 sysdev_create_file(&node->sysdev, &attr_meminfo);
233 sysdev_create_file(&node->sysdev, &attr_numastat);
234 sysdev_create_file(&node->sysdev, &attr_distance);
236 scan_unevictable_register_node(node);
238 hugetlb_register_node(node);
244 * unregister_node - unregister a node device
245 * @node: node going away
247 * Unregisters a node device @node. All the devices on the node must be
248 * unregistered before calling this function.
250 void unregister_node(struct node *node)
252 sysdev_remove_file(&node->sysdev, &attr_cpumap);
253 sysdev_remove_file(&node->sysdev, &attr_cpulist);
254 sysdev_remove_file(&node->sysdev, &attr_meminfo);
255 sysdev_remove_file(&node->sysdev, &attr_numastat);
256 sysdev_remove_file(&node->sysdev, &attr_distance);
258 scan_unevictable_unregister_node(node);
259 hugetlb_unregister_node(node); /* no-op, if memoryless node */
261 sysdev_unregister(&node->sysdev);
264 struct node node_devices[MAX_NUMNODES];
267 * register cpu under node
269 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
271 if (node_online(nid)) {
272 struct sys_device *obj = get_cpu_sysdev(cpu);
275 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
277 kobject_name(&obj->kobj));
283 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
285 if (node_online(nid)) {
286 struct sys_device *obj = get_cpu_sysdev(cpu);
288 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
289 kobject_name(&obj->kobj));
294 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
295 #define page_initialized(page) (page->lru.next)
297 static int get_nid_for_pfn(unsigned long pfn)
301 if (!pfn_valid_within(pfn))
303 page = pfn_to_page(pfn);
304 if (!page_initialized(page))
306 return pfn_to_nid(pfn);
309 /* register memory section under specified node if it spans that node */
310 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
312 unsigned long pfn, sect_start_pfn, sect_end_pfn;
316 if (!node_online(nid))
318 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
319 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
320 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
323 page_nid = get_nid_for_pfn(pfn);
328 return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
329 &mem_blk->sysdev.kobj,
330 kobject_name(&mem_blk->sysdev.kobj));
332 /* mem section does not span the specified node */
336 /* unregister memory section under all nodes that it spans */
337 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
339 nodemask_t unlinked_nodes;
340 unsigned long pfn, sect_start_pfn, sect_end_pfn;
344 nodes_clear(unlinked_nodes);
345 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
346 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
347 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
350 nid = get_nid_for_pfn(pfn);
353 if (!node_online(nid))
355 if (node_test_and_set(nid, unlinked_nodes))
357 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
358 kobject_name(&mem_blk->sysdev.kobj));
363 static int link_mem_sections(int nid)
365 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
366 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
370 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
371 unsigned long section_nr = pfn_to_section_nr(pfn);
372 struct mem_section *mem_sect;
373 struct memory_block *mem_blk;
376 if (!present_section_nr(section_nr))
378 mem_sect = __nr_to_section(section_nr);
379 mem_blk = find_memory_block(mem_sect);
380 ret = register_mem_sect_under_node(mem_blk, nid);
384 /* discard ref obtained in find_memory_block() */
385 kobject_put(&mem_blk->sysdev.kobj);
391 * Handle per node hstate attribute [un]registration on transistions
392 * to/from memoryless state.
395 static int node_memory_callback(struct notifier_block *self,
396 unsigned long action, void *arg)
398 struct memory_notify *mnb = arg;
399 int nid = mnb->status_change_nid;
402 case MEM_ONLINE: /* memory successfully brought online */
403 if (nid != NUMA_NO_NODE)
404 hugetlb_register_node(&node_devices[nid]);
406 case MEM_OFFLINE: /* or offline */
407 if (nid != NUMA_NO_NODE)
408 hugetlb_unregister_node(&node_devices[nid]);
410 case MEM_GOING_ONLINE:
411 case MEM_GOING_OFFLINE:
412 case MEM_CANCEL_ONLINE:
413 case MEM_CANCEL_OFFLINE:
421 static int link_mem_sections(int nid) { return 0; }
423 static inline int node_memory_callback(struct notifier_block *self,
424 unsigned long action, void *arg)
428 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
430 int register_one_node(int nid)
435 if (node_online(nid)) {
436 int p_node = parent_node(nid);
437 struct node *parent = NULL;
440 parent = &node_devices[p_node];
442 error = register_node(&node_devices[nid], nid, parent);
444 /* link cpu under this node */
445 for_each_present_cpu(cpu) {
446 if (cpu_to_node(cpu) == nid)
447 register_cpu_under_node(cpu, nid);
450 /* link memory sections under this node */
451 error = link_mem_sections(nid);
458 void unregister_one_node(int nid)
460 unregister_node(&node_devices[nid]);
464 * node states attributes
467 static ssize_t print_nodes_state(enum node_states state, char *buf)
471 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
472 if (n > 0 && PAGE_SIZE > n + 1) {
479 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
481 return print_nodes_state(N_POSSIBLE, buf);
484 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
486 return print_nodes_state(N_ONLINE, buf);
489 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
492 return print_nodes_state(N_NORMAL_MEMORY, buf);
495 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
497 return print_nodes_state(N_CPU, buf);
500 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
501 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
502 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
504 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
506 #ifdef CONFIG_HIGHMEM
507 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
510 return print_nodes_state(N_HIGH_MEMORY, buf);
513 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
517 struct sysdev_class_attribute *node_state_attr[] = {
520 &attr_has_normal_memory,
521 #ifdef CONFIG_HIGHMEM
522 &attr_has_high_memory,
527 static int node_states_init(void)
532 for (i = 0; i < NR_NODE_STATES; i++) {
534 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
541 #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
542 static int __init register_node_type(void)
546 ret = sysdev_class_register(&node_class);
548 ret = node_states_init();
549 hotplug_memory_notifier(node_memory_callback,
554 * Note: we're not going to unregister the node class if we fail
555 * to register the node state class attribute files.
559 postcore_initcall(register_node_type);