39f3d1b3a21354aa112f5fb222b862d99daafb04
[linux-2.6.git] / drivers / base / node.c
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 #include <linux/device.h>
16
17 static struct sysdev_class node_class = {
18         .name = "node",
19 };
20
21
22 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
23 {
24         struct node *node_dev = to_node(dev);
25         node_to_cpumask_ptr(mask, node_dev->sysdev.id);
26         int len;
27
28         /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
29         BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
30
31         len = type?
32                 cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
33                 cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
34         buf[len++] = '\n';
35         buf[len] = '\0';
36         return len;
37 }
38
39 static inline ssize_t node_read_cpumask(struct sys_device *dev, char *buf)
40 {
41         return node_read_cpumap(dev, 0, buf);
42 }
43 static inline ssize_t node_read_cpulist(struct sys_device *dev, char *buf)
44 {
45         return node_read_cpumap(dev, 1, buf);
46 }
47
48 static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
49 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
50
51 #define K(x) ((x) << (PAGE_SHIFT - 10))
52 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
53 {
54         int n;
55         int nid = dev->id;
56         struct sysinfo i;
57
58         si_meminfo_node(&i, nid);
59
60         n = sprintf(buf, "\n"
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 #ifdef CONFIG_HIGHMEM
67                        "Node %d HighTotal:    %8lu kB\n"
68                        "Node %d HighFree:     %8lu kB\n"
69                        "Node %d LowTotal:     %8lu kB\n"
70                        "Node %d LowFree:      %8lu kB\n"
71 #endif
72                        "Node %d Dirty:        %8lu kB\n"
73                        "Node %d Writeback:    %8lu kB\n"
74                        "Node %d FilePages:    %8lu kB\n"
75                        "Node %d Mapped:       %8lu kB\n"
76                        "Node %d AnonPages:    %8lu kB\n"
77                        "Node %d PageTables:   %8lu kB\n"
78                        "Node %d NFS_Unstable: %8lu kB\n"
79                        "Node %d Bounce:       %8lu kB\n"
80                        "Node %d WritebackTmp: %8lu kB\n"
81                        "Node %d Slab:         %8lu kB\n"
82                        "Node %d SReclaimable: %8lu kB\n"
83                        "Node %d SUnreclaim:   %8lu kB\n",
84                        nid, K(i.totalram),
85                        nid, K(i.freeram),
86                        nid, K(i.totalram - i.freeram),
87                        nid, node_page_state(nid, NR_ACTIVE),
88                        nid, node_page_state(nid, NR_INACTIVE),
89 #ifdef CONFIG_HIGHMEM
90                        nid, K(i.totalhigh),
91                        nid, K(i.freehigh),
92                        nid, K(i.totalram - i.totalhigh),
93                        nid, K(i.freeram - i.freehigh),
94 #endif
95                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
96                        nid, K(node_page_state(nid, NR_WRITEBACK)),
97                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
98                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
99                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
100                        nid, K(node_page_state(nid, NR_PAGETABLE)),
101                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
102                        nid, K(node_page_state(nid, NR_BOUNCE)),
103                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
104                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
105                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
106                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
107                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
108         n += hugetlb_report_node_meminfo(nid, buf + n);
109         return n;
110 }
111
112 #undef K
113 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
114
115 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
116 {
117         return sprintf(buf,
118                        "numa_hit %lu\n"
119                        "numa_miss %lu\n"
120                        "numa_foreign %lu\n"
121                        "interleave_hit %lu\n"
122                        "local_node %lu\n"
123                        "other_node %lu\n",
124                        node_page_state(dev->id, NUMA_HIT),
125                        node_page_state(dev->id, NUMA_MISS),
126                        node_page_state(dev->id, NUMA_FOREIGN),
127                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
128                        node_page_state(dev->id, NUMA_LOCAL),
129                        node_page_state(dev->id, NUMA_OTHER));
130 }
131 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
132
133 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
134 {
135         int nid = dev->id;
136         int len = 0;
137         int i;
138
139         /* buf currently PAGE_SIZE, need ~4 chars per node */
140         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
141
142         for_each_online_node(i)
143                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
144
145         len += sprintf(buf + len, "\n");
146         return len;
147 }
148 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
149
150
151 /*
152  * register_node - Setup a sysfs device for a node.
153  * @num - Node number to use when creating the device.
154  *
155  * Initialize and register the node device.
156  */
157 int register_node(struct node *node, int num, struct node *parent)
158 {
159         int error;
160
161         node->sysdev.id = num;
162         node->sysdev.cls = &node_class;
163         error = sysdev_register(&node->sysdev);
164
165         if (!error){
166                 sysdev_create_file(&node->sysdev, &attr_cpumap);
167                 sysdev_create_file(&node->sysdev, &attr_cpulist);
168                 sysdev_create_file(&node->sysdev, &attr_meminfo);
169                 sysdev_create_file(&node->sysdev, &attr_numastat);
170                 sysdev_create_file(&node->sysdev, &attr_distance);
171         }
172         return error;
173 }
174
175 /**
176  * unregister_node - unregister a node device
177  * @node: node going away
178  *
179  * Unregisters a node device @node.  All the devices on the node must be
180  * unregistered before calling this function.
181  */
182 void unregister_node(struct node *node)
183 {
184         sysdev_remove_file(&node->sysdev, &attr_cpumap);
185         sysdev_remove_file(&node->sysdev, &attr_cpulist);
186         sysdev_remove_file(&node->sysdev, &attr_meminfo);
187         sysdev_remove_file(&node->sysdev, &attr_numastat);
188         sysdev_remove_file(&node->sysdev, &attr_distance);
189
190         sysdev_unregister(&node->sysdev);
191 }
192
193 struct node node_devices[MAX_NUMNODES];
194
195 /*
196  * register cpu under node
197  */
198 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
199 {
200         if (node_online(nid)) {
201                 struct sys_device *obj = get_cpu_sysdev(cpu);
202                 if (!obj)
203                         return 0;
204                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
205                                          &obj->kobj,
206                                          kobject_name(&obj->kobj));
207          }
208
209         return 0;
210 }
211
212 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
213 {
214         if (node_online(nid)) {
215                 struct sys_device *obj = get_cpu_sysdev(cpu);
216                 if (obj)
217                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
218                                          kobject_name(&obj->kobj));
219         }
220         return 0;
221 }
222
223 int register_one_node(int nid)
224 {
225         int error = 0;
226         int cpu;
227
228         if (node_online(nid)) {
229                 int p_node = parent_node(nid);
230                 struct node *parent = NULL;
231
232                 if (p_node != nid)
233                         parent = &node_devices[p_node];
234
235                 error = register_node(&node_devices[nid], nid, parent);
236
237                 /* link cpu under this node */
238                 for_each_present_cpu(cpu) {
239                         if (cpu_to_node(cpu) == nid)
240                                 register_cpu_under_node(cpu, nid);
241                 }
242         }
243
244         return error;
245
246 }
247
248 void unregister_one_node(int nid)
249 {
250         unregister_node(&node_devices[nid]);
251 }
252
253 /*
254  * node states attributes
255  */
256
257 static ssize_t print_nodes_state(enum node_states state, char *buf)
258 {
259         int n;
260
261         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
262         if (n > 0 && PAGE_SIZE > n + 1) {
263                 *(buf + n++) = '\n';
264                 *(buf + n++) = '\0';
265         }
266         return n;
267 }
268
269 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
270 {
271         return print_nodes_state(N_POSSIBLE, buf);
272 }
273
274 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
275 {
276         return print_nodes_state(N_ONLINE, buf);
277 }
278
279 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
280                                                 char *buf)
281 {
282         return print_nodes_state(N_NORMAL_MEMORY, buf);
283 }
284
285 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
286 {
287         return print_nodes_state(N_CPU, buf);
288 }
289
290 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
291 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
292 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
293                                                                         NULL);
294 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
295
296 #ifdef CONFIG_HIGHMEM
297 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
298                                                  char *buf)
299 {
300         return print_nodes_state(N_HIGH_MEMORY, buf);
301 }
302
303 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
304                                                                          NULL);
305 #endif
306
307 struct sysdev_class_attribute *node_state_attr[] = {
308         &attr_possible,
309         &attr_online,
310         &attr_has_normal_memory,
311 #ifdef CONFIG_HIGHMEM
312         &attr_has_high_memory,
313 #endif
314         &attr_has_cpu,
315 };
316
317 static int node_states_init(void)
318 {
319         int i;
320         int err = 0;
321
322         for (i = 0;  i < NR_NODE_STATES; i++) {
323                 int ret;
324                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
325                 if (!err)
326                         err = ret;
327         }
328         return err;
329 }
330
331 static int __init register_node_type(void)
332 {
333         int ret;
334
335         ret = sysdev_class_register(&node_class);
336         if (!ret)
337                 ret = node_states_init();
338
339         /*
340          * Note:  we're not going to unregister the node class if we fail
341          * to register the node state class attribute files.
342          */
343         return ret;
344 }
345 postcore_initcall(register_node_type);