fb: convert lock/unlock_kernel() into local fb mutex
[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 #include <linux/swap.h>
17
18 static struct sysdev_class node_class = {
19         .name = "node",
20 };
21
22
23 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
24 {
25         struct node *node_dev = to_node(dev);
26         node_to_cpumask_ptr(mask, node_dev->sysdev.id);
27         int len;
28
29         /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
30         BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
31
32         len = type?
33                 cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
34                 cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
35         buf[len++] = '\n';
36         buf[len] = '\0';
37         return len;
38 }
39
40 static inline ssize_t node_read_cpumask(struct sys_device *dev,
41                                 struct sysdev_attribute *attr, char *buf)
42 {
43         return node_read_cpumap(dev, 0, buf);
44 }
45 static inline ssize_t node_read_cpulist(struct sys_device *dev,
46                                 struct sysdev_attribute *attr, char *buf)
47 {
48         return node_read_cpumap(dev, 1, buf);
49 }
50
51 static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
52 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
53
54 #define K(x) ((x) << (PAGE_SHIFT - 10))
55 static ssize_t node_read_meminfo(struct sys_device * dev,
56                         struct sysdev_attribute *attr, char * buf)
57 {
58         int n;
59         int nid = dev->id;
60         struct sysinfo i;
61
62         si_meminfo_node(&i, nid);
63
64         n = sprintf(buf, "\n"
65                        "Node %d MemTotal:       %8lu kB\n"
66                        "Node %d MemFree:        %8lu kB\n"
67                        "Node %d MemUsed:        %8lu kB\n"
68                        "Node %d Active:         %8lu kB\n"
69                        "Node %d Inactive:       %8lu kB\n"
70                        "Node %d Active(anon):   %8lu kB\n"
71                        "Node %d Inactive(anon): %8lu kB\n"
72                        "Node %d Active(file):   %8lu kB\n"
73                        "Node %d Inactive(file): %8lu kB\n"
74 #ifdef CONFIG_UNEVICTABLE_LRU
75                        "Node %d Unevictable:    %8lu kB\n"
76                        "Node %d Mlocked:        %8lu kB\n"
77 #endif
78 #ifdef CONFIG_HIGHMEM
79                        "Node %d HighTotal:      %8lu kB\n"
80                        "Node %d HighFree:       %8lu kB\n"
81                        "Node %d LowTotal:       %8lu kB\n"
82                        "Node %d LowFree:        %8lu kB\n"
83 #endif
84                        "Node %d Dirty:          %8lu kB\n"
85                        "Node %d Writeback:      %8lu kB\n"
86                        "Node %d FilePages:      %8lu kB\n"
87                        "Node %d Mapped:         %8lu kB\n"
88                        "Node %d AnonPages:      %8lu kB\n"
89                        "Node %d PageTables:     %8lu kB\n"
90                        "Node %d NFS_Unstable:   %8lu kB\n"
91                        "Node %d Bounce:         %8lu kB\n"
92                        "Node %d WritebackTmp:   %8lu kB\n"
93                        "Node %d Slab:           %8lu kB\n"
94                        "Node %d SReclaimable:   %8lu kB\n"
95                        "Node %d SUnreclaim:     %8lu kB\n",
96                        nid, K(i.totalram),
97                        nid, K(i.freeram),
98                        nid, K(i.totalram - i.freeram),
99                        nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
100                                 node_page_state(nid, NR_ACTIVE_FILE)),
101                        nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
102                                 node_page_state(nid, NR_INACTIVE_FILE)),
103                        nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
104                        nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
105                        nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
106                        nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
107 #ifdef CONFIG_UNEVICTABLE_LRU
108                        nid, K(node_page_state(nid, NR_UNEVICTABLE)),
109                        nid, K(node_page_state(nid, NR_MLOCK)),
110 #endif
111 #ifdef CONFIG_HIGHMEM
112                        nid, K(i.totalhigh),
113                        nid, K(i.freehigh),
114                        nid, K(i.totalram - i.totalhigh),
115                        nid, K(i.freeram - i.freehigh),
116 #endif
117                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
118                        nid, K(node_page_state(nid, NR_WRITEBACK)),
119                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
120                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
121                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
122                        nid, K(node_page_state(nid, NR_PAGETABLE)),
123                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
124                        nid, K(node_page_state(nid, NR_BOUNCE)),
125                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
126                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
127                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
128                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
129                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
130         n += hugetlb_report_node_meminfo(nid, buf + n);
131         return n;
132 }
133
134 #undef K
135 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
136
137 static ssize_t node_read_numastat(struct sys_device * dev,
138                                 struct sysdev_attribute *attr, char * buf)
139 {
140         return sprintf(buf,
141                        "numa_hit %lu\n"
142                        "numa_miss %lu\n"
143                        "numa_foreign %lu\n"
144                        "interleave_hit %lu\n"
145                        "local_node %lu\n"
146                        "other_node %lu\n",
147                        node_page_state(dev->id, NUMA_HIT),
148                        node_page_state(dev->id, NUMA_MISS),
149                        node_page_state(dev->id, NUMA_FOREIGN),
150                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
151                        node_page_state(dev->id, NUMA_LOCAL),
152                        node_page_state(dev->id, NUMA_OTHER));
153 }
154 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
155
156 static ssize_t node_read_distance(struct sys_device * dev,
157                         struct sysdev_attribute *attr, char * buf)
158 {
159         int nid = dev->id;
160         int len = 0;
161         int i;
162
163         /* buf currently PAGE_SIZE, need ~4 chars per node */
164         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
165
166         for_each_online_node(i)
167                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
168
169         len += sprintf(buf + len, "\n");
170         return len;
171 }
172 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
173
174
175 /*
176  * register_node - Setup a sysfs device for a node.
177  * @num - Node number to use when creating the device.
178  *
179  * Initialize and register the node device.
180  */
181 int register_node(struct node *node, int num, struct node *parent)
182 {
183         int error;
184
185         node->sysdev.id = num;
186         node->sysdev.cls = &node_class;
187         error = sysdev_register(&node->sysdev);
188
189         if (!error){
190                 sysdev_create_file(&node->sysdev, &attr_cpumap);
191                 sysdev_create_file(&node->sysdev, &attr_cpulist);
192                 sysdev_create_file(&node->sysdev, &attr_meminfo);
193                 sysdev_create_file(&node->sysdev, &attr_numastat);
194                 sysdev_create_file(&node->sysdev, &attr_distance);
195
196                 scan_unevictable_register_node(node);
197         }
198         return error;
199 }
200
201 /**
202  * unregister_node - unregister a node device
203  * @node: node going away
204  *
205  * Unregisters a node device @node.  All the devices on the node must be
206  * unregistered before calling this function.
207  */
208 void unregister_node(struct node *node)
209 {
210         sysdev_remove_file(&node->sysdev, &attr_cpumap);
211         sysdev_remove_file(&node->sysdev, &attr_cpulist);
212         sysdev_remove_file(&node->sysdev, &attr_meminfo);
213         sysdev_remove_file(&node->sysdev, &attr_numastat);
214         sysdev_remove_file(&node->sysdev, &attr_distance);
215
216         scan_unevictable_unregister_node(node);
217
218         sysdev_unregister(&node->sysdev);
219 }
220
221 struct node node_devices[MAX_NUMNODES];
222
223 /*
224  * register cpu under node
225  */
226 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
227 {
228         if (node_online(nid)) {
229                 struct sys_device *obj = get_cpu_sysdev(cpu);
230                 if (!obj)
231                         return 0;
232                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
233                                          &obj->kobj,
234                                          kobject_name(&obj->kobj));
235          }
236
237         return 0;
238 }
239
240 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
241 {
242         if (node_online(nid)) {
243                 struct sys_device *obj = get_cpu_sysdev(cpu);
244                 if (obj)
245                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
246                                          kobject_name(&obj->kobj));
247         }
248         return 0;
249 }
250
251 int register_one_node(int nid)
252 {
253         int error = 0;
254         int cpu;
255
256         if (node_online(nid)) {
257                 int p_node = parent_node(nid);
258                 struct node *parent = NULL;
259
260                 if (p_node != nid)
261                         parent = &node_devices[p_node];
262
263                 error = register_node(&node_devices[nid], nid, parent);
264
265                 /* link cpu under this node */
266                 for_each_present_cpu(cpu) {
267                         if (cpu_to_node(cpu) == nid)
268                                 register_cpu_under_node(cpu, nid);
269                 }
270         }
271
272         return error;
273
274 }
275
276 void unregister_one_node(int nid)
277 {
278         unregister_node(&node_devices[nid]);
279 }
280
281 /*
282  * node states attributes
283  */
284
285 static ssize_t print_nodes_state(enum node_states state, char *buf)
286 {
287         int n;
288
289         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
290         if (n > 0 && PAGE_SIZE > n + 1) {
291                 *(buf + n++) = '\n';
292                 *(buf + n++) = '\0';
293         }
294         return n;
295 }
296
297 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
298 {
299         return print_nodes_state(N_POSSIBLE, buf);
300 }
301
302 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
303 {
304         return print_nodes_state(N_ONLINE, buf);
305 }
306
307 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
308                                                 char *buf)
309 {
310         return print_nodes_state(N_NORMAL_MEMORY, buf);
311 }
312
313 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
314 {
315         return print_nodes_state(N_CPU, buf);
316 }
317
318 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
319 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
320 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
321                                                                         NULL);
322 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
323
324 #ifdef CONFIG_HIGHMEM
325 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
326                                                  char *buf)
327 {
328         return print_nodes_state(N_HIGH_MEMORY, buf);
329 }
330
331 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
332                                                                          NULL);
333 #endif
334
335 struct sysdev_class_attribute *node_state_attr[] = {
336         &attr_possible,
337         &attr_online,
338         &attr_has_normal_memory,
339 #ifdef CONFIG_HIGHMEM
340         &attr_has_high_memory,
341 #endif
342         &attr_has_cpu,
343 };
344
345 static int node_states_init(void)
346 {
347         int i;
348         int err = 0;
349
350         for (i = 0;  i < NR_NODE_STATES; i++) {
351                 int ret;
352                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
353                 if (!err)
354                         err = ret;
355         }
356         return err;
357 }
358
359 static int __init register_node_type(void)
360 {
361         int ret;
362
363         ret = sysdev_class_register(&node_class);
364         if (!ret)
365                 ret = node_states_init();
366
367         /*
368          * Note:  we're not going to unregister the node class if we fail
369          * to register the node state class attribute files.
370          */
371         return ret;
372 }
373 postcore_initcall(register_node_type);