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/node.h>
10 #include <linux/hugetlb.h>
11 #include <linux/cpumask.h>
12 #include <linux/topology.h>
13 #include <linux/nodemask.h>
14 #include <linux/cpu.h>
16 static struct sysdev_class node_class = {
17 set_kset_name("node"),
21 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
23 struct node *node_dev = to_node(dev);
24 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
27 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
28 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
30 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
31 len += sprintf(buf + len, "\n");
35 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
37 #define K(x) ((x) << (PAGE_SHIFT - 10))
38 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
44 unsigned long inactive;
48 si_meminfo_node(&i, nid);
49 get_page_state_node(&ps, nid);
50 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
52 /* Check for negative values in these approximate counters */
53 if ((long)ps.nr_dirty < 0)
55 if ((long)ps.nr_writeback < 0)
57 if ((long)ps.nr_slab < 0)
61 "Node %d MemTotal: %8lu kB\n"
62 "Node %d MemFree: %8lu kB\n"
63 "Node %d MemUsed: %8lu kB\n"
64 "Node %d Active: %8lu kB\n"
65 "Node %d Inactive: %8lu kB\n"
66 "Node %d HighTotal: %8lu kB\n"
67 "Node %d HighFree: %8lu kB\n"
68 "Node %d LowTotal: %8lu kB\n"
69 "Node %d LowFree: %8lu kB\n"
70 "Node %d Dirty: %8lu kB\n"
71 "Node %d Writeback: %8lu kB\n"
72 "Node %d Mapped: %8lu kB\n"
73 "Node %d Slab: %8lu kB\n",
76 nid, K(i.totalram - i.freeram),
81 nid, K(i.totalram - i.totalhigh),
82 nid, K(i.freeram - i.freehigh),
84 nid, K(ps.nr_writeback),
85 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
87 n += hugetlb_report_node_meminfo(nid, buf + n);
92 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
94 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
96 unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
97 unsigned long local_node, other_node;
99 pg_data_t *pg = NODE_DATA(dev->id);
106 for (i = 0; i < MAX_NR_ZONES; i++) {
107 struct zone *z = &pg->node_zones[i];
108 for_each_online_cpu(cpu) {
109 struct per_cpu_pageset *ps = zone_pcp(z,cpu);
110 numa_hit += ps->numa_hit;
111 numa_miss += ps->numa_miss;
112 numa_foreign += ps->numa_foreign;
113 interleave_hit += ps->interleave_hit;
114 local_node += ps->local_node;
115 other_node += ps->other_node;
122 "interleave_hit %lu\n"
132 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
134 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
140 /* buf currently PAGE_SIZE, need ~4 chars per node */
141 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
143 for_each_online_node(i)
144 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
146 len += sprintf(buf + len, "\n");
149 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
153 * register_node - Setup a driverfs device for a node.
154 * @num - Node number to use when creating the device.
156 * Initialize and register the node device.
158 int register_node(struct node *node, int num, struct node *parent)
162 node->sysdev.id = num;
163 node->sysdev.cls = &node_class;
164 error = sysdev_register(&node->sysdev);
167 sysdev_create_file(&node->sysdev, &attr_cpumap);
168 sysdev_create_file(&node->sysdev, &attr_meminfo);
169 sysdev_create_file(&node->sysdev, &attr_numastat);
170 sysdev_create_file(&node->sysdev, &attr_distance);
176 * unregister_node - unregister a node device
177 * @node: node going away
179 * Unregisters a node device @node. All the devices on the node must be
180 * unregistered before calling this function.
182 void unregister_node(struct node *node)
184 sysdev_remove_file(&node->sysdev, &attr_cpumap);
185 sysdev_remove_file(&node->sysdev, &attr_meminfo);
186 sysdev_remove_file(&node->sysdev, &attr_numastat);
187 sysdev_remove_file(&node->sysdev, &attr_distance);
189 sysdev_unregister(&node->sysdev);
192 struct node node_devices[MAX_NUMNODES];
195 * register cpu under node
197 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
199 if (node_online(nid)) {
200 struct sys_device *obj = get_cpu_sysdev(cpu);
203 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
205 kobject_name(&obj->kobj));
211 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
213 if (node_online(nid)) {
214 struct sys_device *obj = get_cpu_sysdev(cpu);
216 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
217 kobject_name(&obj->kobj));
222 int register_one_node(int nid)
227 if (node_online(nid)) {
228 int p_node = parent_node(nid);
229 struct node *parent = NULL;
232 parent = &node_devices[p_node];
234 error = register_node(&node_devices[nid], nid, parent);
236 /* link cpu under this node */
237 for_each_present_cpu(cpu) {
238 if (cpu_to_node(cpu) == nid)
239 register_cpu_under_node(cpu, nid);
247 void unregister_one_node(int nid)
249 unregister_node(&node_devices[nid]);
252 static int __init register_node_type(void)
254 return sysdev_class_register(&node_class);
256 postcore_initcall(register_node_type);