1/*
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>
14#include <linux/cpu.h>
15
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;
43
44	si_meminfo_node(&i, nid);
45
46	n = sprintf(buf, "\n"
47		       "Node %d MemTotal:     %8lu kB\n"
48		       "Node %d MemFree:      %8lu kB\n"
49		       "Node %d MemUsed:      %8lu kB\n"
50		       "Node %d Active:       %8lu kB\n"
51		       "Node %d Inactive:     %8lu kB\n"
52#ifdef CONFIG_HIGHMEM
53		       "Node %d HighTotal:    %8lu kB\n"
54		       "Node %d HighFree:     %8lu kB\n"
55		       "Node %d LowTotal:     %8lu kB\n"
56		       "Node %d LowFree:      %8lu kB\n"
57#endif
58		       "Node %d Dirty:        %8lu kB\n"
59		       "Node %d Writeback:    %8lu kB\n"
60		       "Node %d FilePages:    %8lu kB\n"
61		       "Node %d Mapped:       %8lu kB\n"
62		       "Node %d AnonPages:    %8lu kB\n"
63		       "Node %d PageTables:   %8lu kB\n"
64		       "Node %d NFS_Unstable: %8lu kB\n"
65		       "Node %d Bounce:       %8lu kB\n"
66		       "Node %d Slab:         %8lu kB\n"
67		       "Node %d SReclaimable: %8lu kB\n"
68		       "Node %d SUnreclaim:   %8lu kB\n",
69		       nid, K(i.totalram),
70		       nid, K(i.freeram),
71		       nid, K(i.totalram - i.freeram),
72		       nid, node_page_state(nid, NR_ACTIVE),
73		       nid, node_page_state(nid, NR_INACTIVE),
74#ifdef CONFIG_HIGHMEM
75		       nid, K(i.totalhigh),
76		       nid, K(i.freehigh),
77		       nid, K(i.totalram - i.totalhigh),
78		       nid, K(i.freeram - i.freehigh),
79#endif
80		       nid, K(node_page_state(nid, NR_FILE_DIRTY)),
81		       nid, K(node_page_state(nid, NR_WRITEBACK)),
82		       nid, K(node_page_state(nid, NR_FILE_PAGES)),
83		       nid, K(node_page_state(nid, NR_FILE_MAPPED)),
84		       nid, K(node_page_state(nid, NR_ANON_PAGES)),
85		       nid, K(node_page_state(nid, NR_PAGETABLE)),
86		       nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
87		       nid, K(node_page_state(nid, NR_BOUNCE)),
88		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
89				node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
90		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
91		       nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
92	n += hugetlb_report_node_meminfo(nid, buf + n);
93	return n;
94}
95
96#undef K
97static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
98
99static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
100{
101	return sprintf(buf,
102		       "numa_hit %lu\n"
103		       "numa_miss %lu\n"
104		       "numa_foreign %lu\n"
105		       "interleave_hit %lu\n"
106		       "local_node %lu\n"
107		       "other_node %lu\n",
108		       node_page_state(dev->id, NUMA_HIT),
109		       node_page_state(dev->id, NUMA_MISS),
110		       node_page_state(dev->id, NUMA_FOREIGN),
111		       node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
112		       node_page_state(dev->id, NUMA_LOCAL),
113		       node_page_state(dev->id, NUMA_OTHER));
114}
115static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
116
117static ssize_t node_read_distance(struct sys_device * dev, char * buf)
118{
119	int nid = dev->id;
120	int len = 0;
121	int i;
122
123	/* buf currently PAGE_SIZE, need ~4 chars per node */
124	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
125
126	for_each_online_node(i)
127		len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
128
129	len += sprintf(buf + len, "\n");
130	return len;
131}
132static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
133
134
135/*
136 * register_node - Setup a sysfs device for a node.
137 * @num - Node number to use when creating the device.
138 *
139 * Initialize and register the node device.
140 */
141int register_node(struct node *node, int num, struct node *parent)
142{
143	int error;
144
145	node->sysdev.id = num;
146	node->sysdev.cls = &node_class;
147	error = sysdev_register(&node->sysdev);
148
149	if (!error){
150		sysdev_create_file(&node->sysdev, &attr_cpumap);
151		sysdev_create_file(&node->sysdev, &attr_meminfo);
152		sysdev_create_file(&node->sysdev, &attr_numastat);
153		sysdev_create_file(&node->sysdev, &attr_distance);
154	}
155	return error;
156}
157
158/**
159 * unregister_node - unregister a node device
160 * @node: node going away
161 *
162 * Unregisters a node device @node.  All the devices on the node must be
163 * unregistered before calling this function.
164 */
165void unregister_node(struct node *node)
166{
167	sysdev_remove_file(&node->sysdev, &attr_cpumap);
168	sysdev_remove_file(&node->sysdev, &attr_meminfo);
169	sysdev_remove_file(&node->sysdev, &attr_numastat);
170	sysdev_remove_file(&node->sysdev, &attr_distance);
171
172	sysdev_unregister(&node->sysdev);
173}
174
175struct node node_devices[MAX_NUMNODES];
176
177/*
178 * register cpu under node
179 */
180int register_cpu_under_node(unsigned int cpu, unsigned int nid)
181{
182	if (node_online(nid)) {
183		struct sys_device *obj = get_cpu_sysdev(cpu);
184		if (!obj)
185			return 0;
186		return sysfs_create_link(&node_devices[nid].sysdev.kobj,
187					 &obj->kobj,
188					 kobject_name(&obj->kobj));
189	 }
190
191	return 0;
192}
193
194int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
195{
196	if (node_online(nid)) {
197		struct sys_device *obj = get_cpu_sysdev(cpu);
198		if (obj)
199			sysfs_remove_link(&node_devices[nid].sysdev.kobj,
200					 kobject_name(&obj->kobj));
201	}
202	return 0;
203}
204
205int register_one_node(int nid)
206{
207	int error = 0;
208	int cpu;
209
210	if (node_online(nid)) {
211		int p_node = parent_node(nid);
212		struct node *parent = NULL;
213
214		if (p_node != nid)
215			parent = &node_devices[p_node];
216
217		error = register_node(&node_devices[nid], nid, parent);
218
219		/* link cpu under this node */
220		for_each_present_cpu(cpu) {
221			if (cpu_to_node(cpu) == nid)
222				register_cpu_under_node(cpu, nid);
223		}
224	}
225
226	return error;
227
228}
229
230void unregister_one_node(int nid)
231{
232	unregister_node(&node_devices[nid]);
233}
234
235static int __init register_node_type(void)
236{
237	return sysdev_class_register(&node_class);
238}
239postcore_initcall(register_node_type);
240