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[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,
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                        "Node %d Active(anon):   %8lu kB\n"
70                        "Node %d Inactive(anon): %8lu kB\n"
71                        "Node %d Active(file):   %8lu kB\n"
72                        "Node %d Inactive(file): %8lu kB\n"
73 #ifdef CONFIG_UNEVICTABLE_LRU
74                        "Node %d Unevictable:    %8lu kB\n"
75                        "Node %d Mlocked:        %8lu kB\n"
76 #endif
77 #ifdef CONFIG_HIGHMEM
78                        "Node %d HighTotal:      %8lu kB\n"
79                        "Node %d HighFree:       %8lu kB\n"
80                        "Node %d LowTotal:       %8lu kB\n"
81                        "Node %d LowFree:        %8lu kB\n"
82 #endif
83                        "Node %d Dirty:          %8lu kB\n"
84                        "Node %d Writeback:      %8lu kB\n"
85                        "Node %d FilePages:      %8lu kB\n"
86                        "Node %d Mapped:         %8lu kB\n"
87                        "Node %d AnonPages:      %8lu kB\n"
88                        "Node %d PageTables:     %8lu kB\n"
89                        "Node %d NFS_Unstable:   %8lu kB\n"
90                        "Node %d Bounce:         %8lu kB\n"
91                        "Node %d WritebackTmp:   %8lu kB\n"
92                        "Node %d Slab:           %8lu kB\n"
93                        "Node %d SReclaimable:   %8lu kB\n"
94                        "Node %d SUnreclaim:     %8lu kB\n",
95                        nid, K(i.totalram),
96                        nid, K(i.freeram),
97                        nid, K(i.totalram - i.freeram),
98                        nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
99                                 node_page_state(nid, NR_ACTIVE_FILE)),
100                        nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
101                                 node_page_state(nid, NR_INACTIVE_FILE)),
102                        nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
103                        nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
104                        nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
105                        nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
106 #ifdef CONFIG_UNEVICTABLE_LRU
107                        nid, K(node_page_state(nid, NR_UNEVICTABLE)),
108                        nid, K(node_page_state(nid, NR_MLOCK)),
109 #endif
110 #ifdef CONFIG_HIGHMEM
111                        nid, K(i.totalhigh),
112                        nid, K(i.freehigh),
113                        nid, K(i.totalram - i.totalhigh),
114                        nid, K(i.freeram - i.freehigh),
115 #endif
116                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
117                        nid, K(node_page_state(nid, NR_WRITEBACK)),
118                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
119                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
120                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
121                        nid, K(node_page_state(nid, NR_PAGETABLE)),
122                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
123                        nid, K(node_page_state(nid, NR_BOUNCE)),
124                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
125                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
126                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
127                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
128                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
129         n += hugetlb_report_node_meminfo(nid, buf + n);
130         return n;
131 }
132
133 #undef K
134 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
135
136 static ssize_t node_read_numastat(struct sys_device * dev,
137                                 struct sysdev_attribute *attr, char * buf)
138 {
139         return sprintf(buf,
140                        "numa_hit %lu\n"
141                        "numa_miss %lu\n"
142                        "numa_foreign %lu\n"
143                        "interleave_hit %lu\n"
144                        "local_node %lu\n"
145                        "other_node %lu\n",
146                        node_page_state(dev->id, NUMA_HIT),
147                        node_page_state(dev->id, NUMA_MISS),
148                        node_page_state(dev->id, NUMA_FOREIGN),
149                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
150                        node_page_state(dev->id, NUMA_LOCAL),
151                        node_page_state(dev->id, NUMA_OTHER));
152 }
153 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
154
155 static ssize_t node_read_distance(struct sys_device * dev,
156                         struct sysdev_attribute *attr, char * buf)
157 {
158         int nid = dev->id;
159         int len = 0;
160         int i;
161
162         /* buf currently PAGE_SIZE, need ~4 chars per node */
163         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
164
165         for_each_online_node(i)
166                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
167
168         len += sprintf(buf + len, "\n");
169         return len;
170 }
171 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
172
173
174 /*
175  * register_node - Setup a sysfs device for a node.
176  * @num - Node number to use when creating the device.
177  *
178  * Initialize and register the node device.
179  */
180 int register_node(struct node *node, int num, struct node *parent)
181 {
182         int error;
183
184         node->sysdev.id = num;
185         node->sysdev.cls = &node_class;
186         error = sysdev_register(&node->sysdev);
187
188         if (!error){
189                 sysdev_create_file(&node->sysdev, &attr_cpumap);
190                 sysdev_create_file(&node->sysdev, &attr_cpulist);
191                 sysdev_create_file(&node->sysdev, &attr_meminfo);
192                 sysdev_create_file(&node->sysdev, &attr_numastat);
193                 sysdev_create_file(&node->sysdev, &attr_distance);
194         }
195         return error;
196 }
197
198 /**
199  * unregister_node - unregister a node device
200  * @node: node going away
201  *
202  * Unregisters a node device @node.  All the devices on the node must be
203  * unregistered before calling this function.
204  */
205 void unregister_node(struct node *node)
206 {
207         sysdev_remove_file(&node->sysdev, &attr_cpumap);
208         sysdev_remove_file(&node->sysdev, &attr_cpulist);
209         sysdev_remove_file(&node->sysdev, &attr_meminfo);
210         sysdev_remove_file(&node->sysdev, &attr_numastat);
211         sysdev_remove_file(&node->sysdev, &attr_distance);
212
213         sysdev_unregister(&node->sysdev);
214 }
215
216 struct node node_devices[MAX_NUMNODES];
217
218 /*
219  * register cpu under node
220  */
221 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
222 {
223         if (node_online(nid)) {
224                 struct sys_device *obj = get_cpu_sysdev(cpu);
225                 if (!obj)
226                         return 0;
227                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
228                                          &obj->kobj,
229                                          kobject_name(&obj->kobj));
230          }
231
232         return 0;
233 }
234
235 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
236 {
237         if (node_online(nid)) {
238                 struct sys_device *obj = get_cpu_sysdev(cpu);
239                 if (obj)
240                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
241                                          kobject_name(&obj->kobj));
242         }
243         return 0;
244 }
245
246 int register_one_node(int nid)
247 {
248         int error = 0;
249         int cpu;
250
251         if (node_online(nid)) {
252                 int p_node = parent_node(nid);
253                 struct node *parent = NULL;
254
255                 if (p_node != nid)
256                         parent = &node_devices[p_node];
257
258                 error = register_node(&node_devices[nid], nid, parent);
259
260                 /* link cpu under this node */
261                 for_each_present_cpu(cpu) {
262                         if (cpu_to_node(cpu) == nid)
263                                 register_cpu_under_node(cpu, nid);
264                 }
265         }
266
267         return error;
268
269 }
270
271 void unregister_one_node(int nid)
272 {
273         unregister_node(&node_devices[nid]);
274 }
275
276 /*
277  * node states attributes
278  */
279
280 static ssize_t print_nodes_state(enum node_states state, char *buf)
281 {
282         int n;
283
284         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
285         if (n > 0 && PAGE_SIZE > n + 1) {
286                 *(buf + n++) = '\n';
287                 *(buf + n++) = '\0';
288         }
289         return n;
290 }
291
292 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
293 {
294         return print_nodes_state(N_POSSIBLE, buf);
295 }
296
297 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
298 {
299         return print_nodes_state(N_ONLINE, buf);
300 }
301
302 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
303                                                 char *buf)
304 {
305         return print_nodes_state(N_NORMAL_MEMORY, buf);
306 }
307
308 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
309 {
310         return print_nodes_state(N_CPU, buf);
311 }
312
313 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
314 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
315 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
316                                                                         NULL);
317 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
318
319 #ifdef CONFIG_HIGHMEM
320 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
321                                                  char *buf)
322 {
323         return print_nodes_state(N_HIGH_MEMORY, buf);
324 }
325
326 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
327                                                                          NULL);
328 #endif
329
330 struct sysdev_class_attribute *node_state_attr[] = {
331         &attr_possible,
332         &attr_online,
333         &attr_has_normal_memory,
334 #ifdef CONFIG_HIGHMEM
335         &attr_has_high_memory,
336 #endif
337         &attr_has_cpu,
338 };
339
340 static int node_states_init(void)
341 {
342         int i;
343         int err = 0;
344
345         for (i = 0;  i < NR_NODE_STATES; i++) {
346                 int ret;
347                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
348                 if (!err)
349                         err = ret;
350         }
351         return err;
352 }
353
354 static int __init register_node_type(void)
355 {
356         int ret;
357
358         ret = sysdev_class_register(&node_class);
359         if (!ret)
360                 ret = node_states_init();
361
362         /*
363          * Note:  we're not going to unregister the node class if we fail
364          * to register the node state class attribute files.
365          */
366         return ret;
367 }
368 postcore_initcall(register_node_type);