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[linux-2.6] / 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,
40                                 struct sysdev_attribute *attr, char *buf)
41 {
42         return node_read_cpumap(dev, 0, buf);
43 }
44 static inline ssize_t node_read_cpulist(struct sys_device *dev,
45                                 struct sysdev_attribute *attr, char *buf)
46 {
47         return node_read_cpumap(dev, 1, buf);
48 }
49
50 static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
51 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
52
53 #define K(x) ((x) << (PAGE_SHIFT - 10))
54 static ssize_t node_read_meminfo(struct sys_device * dev,
55                         struct sysdev_attribute *attr, char * buf)
56 {
57         int n;
58         int nid = dev->id;
59         struct sysinfo i;
60
61         si_meminfo_node(&i, nid);
62
63         n = sprintf(buf, "\n"
64                        "Node %d MemTotal:     %8lu kB\n"
65                        "Node %d MemFree:      %8lu kB\n"
66                        "Node %d MemUsed:      %8lu kB\n"
67                        "Node %d Active:       %8lu kB\n"
68                        "Node %d Inactive:     %8lu kB\n"
69 #ifdef CONFIG_HIGHMEM
70                        "Node %d HighTotal:    %8lu kB\n"
71                        "Node %d HighFree:     %8lu kB\n"
72                        "Node %d LowTotal:     %8lu kB\n"
73                        "Node %d LowFree:      %8lu kB\n"
74 #endif
75                        "Node %d Dirty:        %8lu kB\n"
76                        "Node %d Writeback:    %8lu kB\n"
77                        "Node %d FilePages:    %8lu kB\n"
78                        "Node %d Mapped:       %8lu kB\n"
79                        "Node %d AnonPages:    %8lu kB\n"
80                        "Node %d PageTables:   %8lu kB\n"
81                        "Node %d NFS_Unstable: %8lu kB\n"
82                        "Node %d Bounce:       %8lu kB\n"
83                        "Node %d WritebackTmp: %8lu kB\n"
84                        "Node %d Slab:         %8lu kB\n"
85                        "Node %d SReclaimable: %8lu kB\n"
86                        "Node %d SUnreclaim:   %8lu kB\n",
87                        nid, K(i.totalram),
88                        nid, K(i.freeram),
89                        nid, K(i.totalram - i.freeram),
90                        nid, K(node_page_state(nid, NR_ACTIVE)),
91                        nid, K(node_page_state(nid, NR_INACTIVE)),
92 #ifdef CONFIG_HIGHMEM
93                        nid, K(i.totalhigh),
94                        nid, K(i.freehigh),
95                        nid, K(i.totalram - i.totalhigh),
96                        nid, K(i.freeram - i.freehigh),
97 #endif
98                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
99                        nid, K(node_page_state(nid, NR_WRITEBACK)),
100                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
101                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
102                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
103                        nid, K(node_page_state(nid, NR_PAGETABLE)),
104                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
105                        nid, K(node_page_state(nid, NR_BOUNCE)),
106                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
107                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
108                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
109                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
110                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
111         n += hugetlb_report_node_meminfo(nid, buf + n);
112         return n;
113 }
114
115 #undef K
116 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
117
118 static ssize_t node_read_numastat(struct sys_device * dev,
119                                 struct sysdev_attribute *attr, char * buf)
120 {
121         return sprintf(buf,
122                        "numa_hit %lu\n"
123                        "numa_miss %lu\n"
124                        "numa_foreign %lu\n"
125                        "interleave_hit %lu\n"
126                        "local_node %lu\n"
127                        "other_node %lu\n",
128                        node_page_state(dev->id, NUMA_HIT),
129                        node_page_state(dev->id, NUMA_MISS),
130                        node_page_state(dev->id, NUMA_FOREIGN),
131                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
132                        node_page_state(dev->id, NUMA_LOCAL),
133                        node_page_state(dev->id, NUMA_OTHER));
134 }
135 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
136
137 static ssize_t node_read_distance(struct sys_device * dev,
138                         struct sysdev_attribute *attr, char * buf)
139 {
140         int nid = dev->id;
141         int len = 0;
142         int i;
143
144         /* buf currently PAGE_SIZE, need ~4 chars per node */
145         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
146
147         for_each_online_node(i)
148                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
149
150         len += sprintf(buf + len, "\n");
151         return len;
152 }
153 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
154
155
156 /*
157  * register_node - Setup a sysfs device for a node.
158  * @num - Node number to use when creating the device.
159  *
160  * Initialize and register the node device.
161  */
162 int register_node(struct node *node, int num, struct node *parent)
163 {
164         int error;
165
166         node->sysdev.id = num;
167         node->sysdev.cls = &node_class;
168         error = sysdev_register(&node->sysdev);
169
170         if (!error){
171                 sysdev_create_file(&node->sysdev, &attr_cpumap);
172                 sysdev_create_file(&node->sysdev, &attr_cpulist);
173                 sysdev_create_file(&node->sysdev, &attr_meminfo);
174                 sysdev_create_file(&node->sysdev, &attr_numastat);
175                 sysdev_create_file(&node->sysdev, &attr_distance);
176         }
177         return error;
178 }
179
180 /**
181  * unregister_node - unregister a node device
182  * @node: node going away
183  *
184  * Unregisters a node device @node.  All the devices on the node must be
185  * unregistered before calling this function.
186  */
187 void unregister_node(struct node *node)
188 {
189         sysdev_remove_file(&node->sysdev, &attr_cpumap);
190         sysdev_remove_file(&node->sysdev, &attr_cpulist);
191         sysdev_remove_file(&node->sysdev, &attr_meminfo);
192         sysdev_remove_file(&node->sysdev, &attr_numastat);
193         sysdev_remove_file(&node->sysdev, &attr_distance);
194
195         sysdev_unregister(&node->sysdev);
196 }
197
198 struct node node_devices[MAX_NUMNODES];
199
200 /*
201  * register cpu under node
202  */
203 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
204 {
205         if (node_online(nid)) {
206                 struct sys_device *obj = get_cpu_sysdev(cpu);
207                 if (!obj)
208                         return 0;
209                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
210                                          &obj->kobj,
211                                          kobject_name(&obj->kobj));
212          }
213
214         return 0;
215 }
216
217 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
218 {
219         if (node_online(nid)) {
220                 struct sys_device *obj = get_cpu_sysdev(cpu);
221                 if (obj)
222                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
223                                          kobject_name(&obj->kobj));
224         }
225         return 0;
226 }
227
228 int register_one_node(int nid)
229 {
230         int error = 0;
231         int cpu;
232
233         if (node_online(nid)) {
234                 int p_node = parent_node(nid);
235                 struct node *parent = NULL;
236
237                 if (p_node != nid)
238                         parent = &node_devices[p_node];
239
240                 error = register_node(&node_devices[nid], nid, parent);
241
242                 /* link cpu under this node */
243                 for_each_present_cpu(cpu) {
244                         if (cpu_to_node(cpu) == nid)
245                                 register_cpu_under_node(cpu, nid);
246                 }
247         }
248
249         return error;
250
251 }
252
253 void unregister_one_node(int nid)
254 {
255         unregister_node(&node_devices[nid]);
256 }
257
258 /*
259  * node states attributes
260  */
261
262 static ssize_t print_nodes_state(enum node_states state, char *buf)
263 {
264         int n;
265
266         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
267         if (n > 0 && PAGE_SIZE > n + 1) {
268                 *(buf + n++) = '\n';
269                 *(buf + n++) = '\0';
270         }
271         return n;
272 }
273
274 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
275 {
276         return print_nodes_state(N_POSSIBLE, buf);
277 }
278
279 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
280 {
281         return print_nodes_state(N_ONLINE, buf);
282 }
283
284 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
285                                                 char *buf)
286 {
287         return print_nodes_state(N_NORMAL_MEMORY, buf);
288 }
289
290 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
291 {
292         return print_nodes_state(N_CPU, buf);
293 }
294
295 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
296 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
297 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
298                                                                         NULL);
299 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
300
301 #ifdef CONFIG_HIGHMEM
302 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
303                                                  char *buf)
304 {
305         return print_nodes_state(N_HIGH_MEMORY, buf);
306 }
307
308 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
309                                                                          NULL);
310 #endif
311
312 struct sysdev_class_attribute *node_state_attr[] = {
313         &attr_possible,
314         &attr_online,
315         &attr_has_normal_memory,
316 #ifdef CONFIG_HIGHMEM
317         &attr_has_high_memory,
318 #endif
319         &attr_has_cpu,
320 };
321
322 static int node_states_init(void)
323 {
324         int i;
325         int err = 0;
326
327         for (i = 0;  i < NR_NODE_STATES; i++) {
328                 int ret;
329                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
330                 if (!err)
331                         err = ret;
332         }
333         return err;
334 }
335
336 static int __init register_node_type(void)
337 {
338         int ret;
339
340         ret = sysdev_class_register(&node_class);
341         if (!ret)
342                 ret = node_states_init();
343
344         /*
345          * Note:  we're not going to unregister the node class if we fail
346          * to register the node state class attribute files.
347          */
348         return ret;
349 }
350 postcore_initcall(register_node_type);