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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>
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>
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -070014#include <linux/cpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16static struct sysdev_class node_class = {
17 set_kset_name("node"),
18};
19
20
21static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
22{
23 struct node *node_dev = to_node(dev);
24 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
25 int len;
26
27 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
28 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
29
30 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
31 len += sprintf(buf + len, "\n");
32 return len;
33}
34
35static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
36
37#define K(x) ((x) << (PAGE_SHIFT - 10))
38static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
39{
40 int n;
41 int nid = dev->id;
42 struct sysinfo i;
Martin Hicksc07e02d2005-09-03 15:55:11 -070043 struct page_state ps;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 unsigned long inactive;
45 unsigned long active;
46 unsigned long free;
47
48 si_meminfo_node(&i, nid);
Martin Hicksc07e02d2005-09-03 15:55:11 -070049 get_page_state_node(&ps, nid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
51
Martin Hicksc07e02d2005-09-03 15:55:11 -070052 /* Check for negative values in these approximate counters */
53 if ((long)ps.nr_dirty < 0)
54 ps.nr_dirty = 0;
55 if ((long)ps.nr_writeback < 0)
56 ps.nr_writeback = 0;
Martin Hicksc07e02d2005-09-03 15:55:11 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 n = sprintf(buf, "\n"
59 "Node %d MemTotal: %8lu kB\n"
60 "Node %d MemFree: %8lu kB\n"
61 "Node %d MemUsed: %8lu kB\n"
62 "Node %d Active: %8lu kB\n"
63 "Node %d Inactive: %8lu kB\n"
64 "Node %d HighTotal: %8lu kB\n"
65 "Node %d HighFree: %8lu kB\n"
66 "Node %d LowTotal: %8lu kB\n"
Martin Hicksc07e02d2005-09-03 15:55:11 -070067 "Node %d LowFree: %8lu kB\n"
68 "Node %d Dirty: %8lu kB\n"
69 "Node %d Writeback: %8lu kB\n"
Christoph Lameter347ce432006-06-30 01:55:35 -070070 "Node %d FilePages: %8lu kB\n"
Martin Hicksc07e02d2005-09-03 15:55:11 -070071 "Node %d Mapped: %8lu kB\n"
Christoph Lameterf3dbd342006-06-30 01:55:36 -070072 "Node %d AnonPages: %8lu kB\n"
Martin Hicksc07e02d2005-09-03 15:55:11 -070073 "Node %d Slab: %8lu kB\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 nid, K(i.totalram),
75 nid, K(i.freeram),
76 nid, K(i.totalram - i.freeram),
77 nid, K(active),
78 nid, K(inactive),
79 nid, K(i.totalhigh),
80 nid, K(i.freehigh),
81 nid, K(i.totalram - i.totalhigh),
Martin Hicksc07e02d2005-09-03 15:55:11 -070082 nid, K(i.freeram - i.freehigh),
83 nid, K(ps.nr_dirty),
84 nid, K(ps.nr_writeback),
Christoph Lameter347ce432006-06-30 01:55:35 -070085 nid, K(node_page_state(nid, NR_FILE_PAGES)),
Christoph Lameter65ba55f2006-06-30 01:55:34 -070086 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
Christoph Lameterf3dbd342006-06-30 01:55:36 -070087 nid, K(node_page_state(nid, NR_ANON_PAGES)),
Christoph Lameter9a865ff2006-06-30 01:55:38 -070088 nid, K(node_page_state(nid, NR_SLAB)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 n += hugetlb_report_node_meminfo(nid, buf + n);
90 return n;
91}
92
93#undef K
94static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
95
96static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
97{
98 unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
99 unsigned long local_node, other_node;
100 int i, cpu;
101 pg_data_t *pg = NODE_DATA(dev->id);
102 numa_hit = 0;
103 numa_miss = 0;
104 interleave_hit = 0;
105 numa_foreign = 0;
106 local_node = 0;
107 other_node = 0;
108 for (i = 0; i < MAX_NR_ZONES; i++) {
109 struct zone *z = &pg->node_zones[i];
Christoph Lameter54404e72006-04-10 22:52:47 -0700110 for_each_online_cpu(cpu) {
Christoph Lametere7c8d5c2005-06-21 17:14:47 -0700111 struct per_cpu_pageset *ps = zone_pcp(z,cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 numa_hit += ps->numa_hit;
113 numa_miss += ps->numa_miss;
114 numa_foreign += ps->numa_foreign;
115 interleave_hit += ps->interleave_hit;
116 local_node += ps->local_node;
117 other_node += ps->other_node;
118 }
119 }
120 return sprintf(buf,
121 "numa_hit %lu\n"
122 "numa_miss %lu\n"
123 "numa_foreign %lu\n"
124 "interleave_hit %lu\n"
125 "local_node %lu\n"
126 "other_node %lu\n",
127 numa_hit,
128 numa_miss,
129 numa_foreign,
130 interleave_hit,
131 local_node,
132 other_node);
133}
134static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
135
136static ssize_t node_read_distance(struct sys_device * dev, char * buf)
137{
138 int nid = dev->id;
139 int len = 0;
140 int i;
141
142 /* buf currently PAGE_SIZE, need ~4 chars per node */
143 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
144
145 for_each_online_node(i)
146 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
147
148 len += sprintf(buf + len, "\n");
149 return len;
150}
151static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
152
153
154/*
155 * register_node - Setup a driverfs device for a node.
156 * @num - Node number to use when creating the device.
157 *
158 * Initialize and register the node device.
159 */
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900160int register_node(struct node *node, int num, struct node *parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 int error;
163
164 node->sysdev.id = num;
165 node->sysdev.cls = &node_class;
166 error = sysdev_register(&node->sysdev);
167
168 if (!error){
169 sysdev_create_file(&node->sysdev, &attr_cpumap);
170 sysdev_create_file(&node->sysdev, &attr_meminfo);
171 sysdev_create_file(&node->sysdev, &attr_numastat);
172 sysdev_create_file(&node->sysdev, &attr_distance);
173 }
174 return error;
175}
176
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900177/**
178 * unregister_node - unregister a node device
179 * @node: node going away
180 *
181 * Unregisters a node device @node. All the devices on the node must be
182 * unregistered before calling this function.
183 */
184void unregister_node(struct node *node)
185{
186 sysdev_remove_file(&node->sysdev, &attr_cpumap);
187 sysdev_remove_file(&node->sysdev, &attr_meminfo);
188 sysdev_remove_file(&node->sysdev, &attr_numastat);
189 sysdev_remove_file(&node->sysdev, &attr_distance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900191 sysdev_unregister(&node->sysdev);
192}
193
Yasunori Goto0fc44152006-06-27 02:53:38 -0700194struct node node_devices[MAX_NUMNODES];
195
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -0700196/*
197 * register cpu under node
198 */
199int register_cpu_under_node(unsigned int cpu, unsigned int nid)
200{
201 if (node_online(nid)) {
202 struct sys_device *obj = get_cpu_sysdev(cpu);
203 if (!obj)
204 return 0;
205 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
206 &obj->kobj,
207 kobject_name(&obj->kobj));
208 }
209
210 return 0;
211}
212
213int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
214{
215 if (node_online(nid)) {
216 struct sys_device *obj = get_cpu_sysdev(cpu);
217 if (obj)
218 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
219 kobject_name(&obj->kobj));
220 }
221 return 0;
222}
223
Yasunori Goto0fc44152006-06-27 02:53:38 -0700224int register_one_node(int nid)
225{
226 int error = 0;
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -0700227 int cpu;
Yasunori Goto0fc44152006-06-27 02:53:38 -0700228
229 if (node_online(nid)) {
230 int p_node = parent_node(nid);
231 struct node *parent = NULL;
232
233 if (p_node != nid)
234 parent = &node_devices[p_node];
235
236 error = register_node(&node_devices[nid], nid, parent);
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -0700237
238 /* link cpu under this node */
239 for_each_present_cpu(cpu) {
240 if (cpu_to_node(cpu) == nid)
241 register_cpu_under_node(cpu, nid);
242 }
Yasunori Goto0fc44152006-06-27 02:53:38 -0700243 }
244
245 return error;
246
247}
248
249void unregister_one_node(int nid)
250{
251 unregister_node(&node_devices[nid]);
252}
253
Keiichiro Tokunaga4b450992005-05-08 21:28:53 +0900254static int __init register_node_type(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
256 return sysdev_class_register(&node_class);
257}
258postcore_initcall(register_node_type);