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>
15 static struct sysdev_class node_class = {
16 set_kset_name("node"),
20 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
22 struct node *node_dev = to_node(dev);
23 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
26 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
27 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
29 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
30 len += sprintf(buf + len, "\n");
34 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
36 #define K(x) ((x) << (PAGE_SHIFT - 10))
37 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
42 unsigned long inactive;
46 si_meminfo_node(&i, nid);
47 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
50 "Node %d MemTotal: %8lu kB\n"
51 "Node %d MemFree: %8lu kB\n"
52 "Node %d MemUsed: %8lu kB\n"
53 "Node %d Active: %8lu kB\n"
54 "Node %d Inactive: %8lu kB\n"
55 "Node %d HighTotal: %8lu kB\n"
56 "Node %d HighFree: %8lu kB\n"
57 "Node %d LowTotal: %8lu kB\n"
58 "Node %d LowFree: %8lu kB\n",
61 nid, K(i.totalram - i.freeram),
66 nid, K(i.totalram - i.totalhigh),
67 nid, K(i.freeram - i.freehigh));
68 n += hugetlb_report_node_meminfo(nid, buf + n);
73 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
75 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
77 unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
78 unsigned long local_node, other_node;
80 pg_data_t *pg = NODE_DATA(dev->id);
87 for (i = 0; i < MAX_NR_ZONES; i++) {
88 struct zone *z = &pg->node_zones[i];
89 for (cpu = 0; cpu < NR_CPUS; cpu++) {
90 struct per_cpu_pageset *ps = zone_pcp(z,cpu);
91 numa_hit += ps->numa_hit;
92 numa_miss += ps->numa_miss;
93 numa_foreign += ps->numa_foreign;
94 interleave_hit += ps->interleave_hit;
95 local_node += ps->local_node;
96 other_node += ps->other_node;
103 "interleave_hit %lu\n"
113 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
115 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
121 /* buf currently PAGE_SIZE, need ~4 chars per node */
122 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
124 for_each_online_node(i)
125 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
127 len += sprintf(buf + len, "\n");
130 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
134 * register_node - Setup a driverfs device for a node.
135 * @num - Node number to use when creating the device.
137 * Initialize and register the node device.
139 int register_node(struct node *node, int num, struct node *parent)
143 node->sysdev.id = num;
144 node->sysdev.cls = &node_class;
145 error = sysdev_register(&node->sysdev);
148 sysdev_create_file(&node->sysdev, &attr_cpumap);
149 sysdev_create_file(&node->sysdev, &attr_meminfo);
150 sysdev_create_file(&node->sysdev, &attr_numastat);
151 sysdev_create_file(&node->sysdev, &attr_distance);
157 * unregister_node - unregister a node device
158 * @node: node going away
160 * Unregisters a node device @node. All the devices on the node must be
161 * unregistered before calling this function.
163 void unregister_node(struct node *node)
165 sysdev_remove_file(&node->sysdev, &attr_cpumap);
166 sysdev_remove_file(&node->sysdev, &attr_meminfo);
167 sysdev_remove_file(&node->sysdev, &attr_numastat);
168 sysdev_remove_file(&node->sysdev, &attr_distance);
170 sysdev_unregister(&node->sysdev);
173 static int __init register_node_type(void)
175 return sysdev_class_register(&node_class);
177 postcore_initcall(register_node_type);