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