Driver core: fix devres_release_all() return value
[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
16 static struct sysdev_class node_class = {
17         set_kset_name("node"),
18 };
19
20
21 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
22 {
23         struct node *node_dev = to_node(dev);
24         cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
25         int len;
26
27         /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
28         BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
29
30         len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
31         len += sprintf(buf + len, "\n");
32         return len;
33 }
34
35 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
36
37 #define K(x) ((x) << (PAGE_SHIFT - 10))
38 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
39 {
40         int n;
41         int nid = dev->id;
42         struct sysinfo i;
43
44         si_meminfo_node(&i, nid);
45
46         n = sprintf(buf, "\n"
47                        "Node %d MemTotal:     %8lu kB\n"
48                        "Node %d MemFree:      %8lu kB\n"
49                        "Node %d MemUsed:      %8lu kB\n"
50                        "Node %d Active:       %8lu kB\n"
51                        "Node %d Inactive:     %8lu kB\n"
52 #ifdef CONFIG_HIGHMEM
53                        "Node %d HighTotal:    %8lu kB\n"
54                        "Node %d HighFree:     %8lu kB\n"
55                        "Node %d LowTotal:     %8lu kB\n"
56                        "Node %d LowFree:      %8lu kB\n"
57 #endif
58                        "Node %d Dirty:        %8lu kB\n"
59                        "Node %d Writeback:    %8lu kB\n"
60                        "Node %d FilePages:    %8lu kB\n"
61                        "Node %d Mapped:       %8lu kB\n"
62                        "Node %d AnonPages:    %8lu kB\n"
63                        "Node %d PageTables:   %8lu kB\n"
64                        "Node %d NFS_Unstable: %8lu kB\n"
65                        "Node %d Bounce:       %8lu kB\n"
66                        "Node %d Slab:         %8lu kB\n"
67                        "Node %d SReclaimable: %8lu kB\n"
68                        "Node %d SUnreclaim:   %8lu kB\n",
69                        nid, K(i.totalram),
70                        nid, K(i.freeram),
71                        nid, K(i.totalram - i.freeram),
72                        nid, node_page_state(nid, NR_ACTIVE),
73                        nid, node_page_state(nid, NR_INACTIVE),
74 #ifdef CONFIG_HIGHMEM
75                        nid, K(i.totalhigh),
76                        nid, K(i.freehigh),
77                        nid, K(i.totalram - i.totalhigh),
78                        nid, K(i.freeram - i.freehigh),
79 #endif
80                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
81                        nid, K(node_page_state(nid, NR_WRITEBACK)),
82                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
83                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
84                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
85                        nid, K(node_page_state(nid, NR_PAGETABLE)),
86                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
87                        nid, K(node_page_state(nid, NR_BOUNCE)),
88                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
89                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
90                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
91                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
92         n += hugetlb_report_node_meminfo(nid, buf + n);
93         return n;
94 }
95
96 #undef K
97 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
98
99 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
100 {
101         return sprintf(buf,
102                        "numa_hit %lu\n"
103                        "numa_miss %lu\n"
104                        "numa_foreign %lu\n"
105                        "interleave_hit %lu\n"
106                        "local_node %lu\n"
107                        "other_node %lu\n",
108                        node_page_state(dev->id, NUMA_HIT),
109                        node_page_state(dev->id, NUMA_MISS),
110                        node_page_state(dev->id, NUMA_FOREIGN),
111                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
112                        node_page_state(dev->id, NUMA_LOCAL),
113                        node_page_state(dev->id, NUMA_OTHER));
114 }
115 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
116
117 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
118 {
119         int nid = dev->id;
120         int len = 0;
121         int i;
122
123         /* buf currently PAGE_SIZE, need ~4 chars per node */
124         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
125
126         for_each_online_node(i)
127                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
128
129         len += sprintf(buf + len, "\n");
130         return len;
131 }
132 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
133
134
135 /*
136  * register_node - Setup a sysfs device for a node.
137  * @num - Node number to use when creating the device.
138  *
139  * Initialize and register the node device.
140  */
141 int register_node(struct node *node, int num, struct node *parent)
142 {
143         int error;
144
145         node->sysdev.id = num;
146         node->sysdev.cls = &node_class;
147         error = sysdev_register(&node->sysdev);
148
149         if (!error){
150                 sysdev_create_file(&node->sysdev, &attr_cpumap);
151                 sysdev_create_file(&node->sysdev, &attr_meminfo);
152                 sysdev_create_file(&node->sysdev, &attr_numastat);
153                 sysdev_create_file(&node->sysdev, &attr_distance);
154         }
155         return error;
156 }
157
158 /**
159  * unregister_node - unregister a node device
160  * @node: node going away
161  *
162  * Unregisters a node device @node.  All the devices on the node must be
163  * unregistered before calling this function.
164  */
165 void unregister_node(struct node *node)
166 {
167         sysdev_remove_file(&node->sysdev, &attr_cpumap);
168         sysdev_remove_file(&node->sysdev, &attr_meminfo);
169         sysdev_remove_file(&node->sysdev, &attr_numastat);
170         sysdev_remove_file(&node->sysdev, &attr_distance);
171
172         sysdev_unregister(&node->sysdev);
173 }
174
175 struct node node_devices[MAX_NUMNODES];
176
177 /*
178  * register cpu under node
179  */
180 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
181 {
182         if (node_online(nid)) {
183                 struct sys_device *obj = get_cpu_sysdev(cpu);
184                 if (!obj)
185                         return 0;
186                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
187                                          &obj->kobj,
188                                          kobject_name(&obj->kobj));
189          }
190
191         return 0;
192 }
193
194 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
195 {
196         if (node_online(nid)) {
197                 struct sys_device *obj = get_cpu_sysdev(cpu);
198                 if (obj)
199                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
200                                          kobject_name(&obj->kobj));
201         }
202         return 0;
203 }
204
205 int register_one_node(int nid)
206 {
207         int error = 0;
208         int cpu;
209
210         if (node_online(nid)) {
211                 int p_node = parent_node(nid);
212                 struct node *parent = NULL;
213
214                 if (p_node != nid)
215                         parent = &node_devices[p_node];
216
217                 error = register_node(&node_devices[nid], nid, parent);
218
219                 /* link cpu under this node */
220                 for_each_present_cpu(cpu) {
221                         if (cpu_to_node(cpu) == nid)
222                                 register_cpu_under_node(cpu, nid);
223                 }
224         }
225
226         return error;
227
228 }
229
230 void unregister_one_node(int nid)
231 {
232         unregister_node(&node_devices[nid]);
233 }
234
235 static int __init register_node_type(void)
236 {
237         return sysdev_class_register(&node_class);
238 }
239 postcore_initcall(register_node_type);