2 * drivers/base/node.c - basic Node class support
5 #include <linux/sysdev.h>
6 #include <linux/module.h>
7 #include <linux/init.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>
16 static struct sysdev_class node_class
= {
17 set_kset_name("node"),
21 static ssize_t
node_read_cpumap(struct sys_device
* dev
, char * buf
)
23 struct node
*node_dev
= to_node(dev
);
24 cpumask_t mask
= node_to_cpumask(node_dev
->sysdev
.id
);
27 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
28 BUILD_BUG_ON(MAX_NUMNODES
/4 > PAGE_SIZE
/2);
30 len
= cpumask_scnprintf(buf
, PAGE_SIZE
-1, mask
);
31 len
+= sprintf(buf
+ len
, "\n");
35 static SYSDEV_ATTR(cpumap
, S_IRUGO
, node_read_cpumap
, NULL
);
37 #define K(x) ((x) << (PAGE_SHIFT - 10))
38 static ssize_t
node_read_meminfo(struct sys_device
* dev
, char * buf
)
43 unsigned long inactive
;
47 si_meminfo_node(&i
, nid
);
48 __get_zone_counts(&active
, &inactive
, &free
, NODE_DATA(nid
));
52 "Node %d MemTotal: %8lu kB\n"
53 "Node %d MemFree: %8lu kB\n"
54 "Node %d MemUsed: %8lu kB\n"
55 "Node %d Active: %8lu kB\n"
56 "Node %d Inactive: %8lu kB\n"
57 "Node %d HighTotal: %8lu kB\n"
58 "Node %d HighFree: %8lu kB\n"
59 "Node %d LowTotal: %8lu kB\n"
60 "Node %d LowFree: %8lu kB\n"
61 "Node %d Dirty: %8lu kB\n"
62 "Node %d Writeback: %8lu kB\n"
63 "Node %d FilePages: %8lu kB\n"
64 "Node %d Mapped: %8lu kB\n"
65 "Node %d AnonPages: %8lu kB\n"
66 "Node %d PageTables: %8lu kB\n"
67 "Node %d NFS_Unstable: %8lu kB\n"
68 "Node %d Bounce: %8lu kB\n"
69 "Node %d Slab: %8lu kB\n",
72 nid
, K(i
.totalram
- i
.freeram
),
77 nid
, K(i
.totalram
- i
.totalhigh
),
78 nid
, K(i
.freeram
- i
.freehigh
),
79 nid
, K(node_page_state(nid
, NR_FILE_DIRTY
)),
80 nid
, K(node_page_state(nid
, NR_WRITEBACK
)),
81 nid
, K(node_page_state(nid
, NR_FILE_PAGES
)),
82 nid
, K(node_page_state(nid
, NR_FILE_MAPPED
)),
83 nid
, K(node_page_state(nid
, NR_ANON_PAGES
)),
84 nid
, K(node_page_state(nid
, NR_PAGETABLE
)),
85 nid
, K(node_page_state(nid
, NR_UNSTABLE_NFS
)),
86 nid
, K(node_page_state(nid
, NR_BOUNCE
)),
87 nid
, K(node_page_state(nid
, NR_SLAB
)));
88 n
+= hugetlb_report_node_meminfo(nid
, buf
+ n
);
93 static SYSDEV_ATTR(meminfo
, S_IRUGO
, node_read_meminfo
, NULL
);
95 static ssize_t
node_read_numastat(struct sys_device
* dev
, char * buf
)
101 "interleave_hit %lu\n"
104 node_page_state(dev
->id
, NUMA_HIT
),
105 node_page_state(dev
->id
, NUMA_MISS
),
106 node_page_state(dev
->id
, NUMA_FOREIGN
),
107 node_page_state(dev
->id
, NUMA_INTERLEAVE_HIT
),
108 node_page_state(dev
->id
, NUMA_LOCAL
),
109 node_page_state(dev
->id
, NUMA_OTHER
));
111 static SYSDEV_ATTR(numastat
, S_IRUGO
, node_read_numastat
, NULL
);
113 static ssize_t
node_read_distance(struct sys_device
* dev
, char * buf
)
119 /* buf currently PAGE_SIZE, need ~4 chars per node */
120 BUILD_BUG_ON(MAX_NUMNODES
*4 > PAGE_SIZE
/2);
122 for_each_online_node(i
)
123 len
+= sprintf(buf
+ len
, "%s%d", i
? " " : "", node_distance(nid
, i
));
125 len
+= sprintf(buf
+ len
, "\n");
128 static SYSDEV_ATTR(distance
, S_IRUGO
, node_read_distance
, NULL
);
132 * register_node - Setup a driverfs device for a node.
133 * @num - Node number to use when creating the device.
135 * Initialize and register the node device.
137 int register_node(struct node
*node
, int num
, struct node
*parent
)
141 node
->sysdev
.id
= num
;
142 node
->sysdev
.cls
= &node_class
;
143 error
= sysdev_register(&node
->sysdev
);
146 sysdev_create_file(&node
->sysdev
, &attr_cpumap
);
147 sysdev_create_file(&node
->sysdev
, &attr_meminfo
);
148 sysdev_create_file(&node
->sysdev
, &attr_numastat
);
149 sysdev_create_file(&node
->sysdev
, &attr_distance
);
155 * unregister_node - unregister a node device
156 * @node: node going away
158 * Unregisters a node device @node. All the devices on the node must be
159 * unregistered before calling this function.
161 void unregister_node(struct node
*node
)
163 sysdev_remove_file(&node
->sysdev
, &attr_cpumap
);
164 sysdev_remove_file(&node
->sysdev
, &attr_meminfo
);
165 sysdev_remove_file(&node
->sysdev
, &attr_numastat
);
166 sysdev_remove_file(&node
->sysdev
, &attr_distance
);
168 sysdev_unregister(&node
->sysdev
);
171 struct node node_devices
[MAX_NUMNODES
];
174 * register cpu under node
176 int register_cpu_under_node(unsigned int cpu
, unsigned int nid
)
178 if (node_online(nid
)) {
179 struct sys_device
*obj
= get_cpu_sysdev(cpu
);
182 return sysfs_create_link(&node_devices
[nid
].sysdev
.kobj
,
184 kobject_name(&obj
->kobj
));
190 int unregister_cpu_under_node(unsigned int cpu
, unsigned int nid
)
192 if (node_online(nid
)) {
193 struct sys_device
*obj
= get_cpu_sysdev(cpu
);
195 sysfs_remove_link(&node_devices
[nid
].sysdev
.kobj
,
196 kobject_name(&obj
->kobj
));
201 int register_one_node(int nid
)
206 if (node_online(nid
)) {
207 int p_node
= parent_node(nid
);
208 struct node
*parent
= NULL
;
211 parent
= &node_devices
[p_node
];
213 error
= register_node(&node_devices
[nid
], nid
, parent
);
215 /* link cpu under this node */
216 for_each_present_cpu(cpu
) {
217 if (cpu_to_node(cpu
) == nid
)
218 register_cpu_under_node(cpu
, nid
);
226 void unregister_one_node(int nid
)
228 unregister_node(&node_devices
[nid
]);
231 static int __init
register_node_type(void)
233 return sysdev_class_register(&node_class
);
235 postcore_initcall(register_node_type
);