]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - drivers/base/node.c
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
)
44 unsigned long inactive
;
48 si_meminfo_node(&i
, nid
);
49 get_page_state_node(&ps
, nid
);
50 __get_zone_counts(&active
, &inactive
, &free
, NODE_DATA(nid
));
52 /* Check for negative values in these approximate counters */
53 if ((long)ps
.nr_dirty
< 0)
55 if ((long)ps
.nr_writeback
< 0)
57 if ((long)ps
.nr_slab
< 0)
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 "Node %d HighTotal: %8lu kB\n"
67 "Node %d HighFree: %8lu kB\n"
68 "Node %d LowTotal: %8lu kB\n"
69 "Node %d LowFree: %8lu kB\n"
70 "Node %d Dirty: %8lu kB\n"
71 "Node %d Writeback: %8lu kB\n"
72 "Node %d FilePages: %8lu kB\n"
73 "Node %d Mapped: %8lu kB\n"
74 "Node %d Slab: %8lu kB\n",
77 nid
, K(i
.totalram
- i
.freeram
),
82 nid
, K(i
.totalram
- i
.totalhigh
),
83 nid
, K(i
.freeram
- i
.freehigh
),
85 nid
, K(ps
.nr_writeback
),
86 nid
, K(node_page_state(nid
, NR_FILE_PAGES
)),
87 nid
, K(node_page_state(nid
, NR_FILE_MAPPED
)),
89 n
+= hugetlb_report_node_meminfo(nid
, buf
+ n
);
94 static SYSDEV_ATTR(meminfo
, S_IRUGO
, node_read_meminfo
, NULL
);
96 static ssize_t
node_read_numastat(struct sys_device
* dev
, char * buf
)
98 unsigned long numa_hit
, numa_miss
, interleave_hit
, numa_foreign
;
99 unsigned long local_node
, other_node
;
101 pg_data_t
*pg
= NODE_DATA(dev
->id
);
108 for (i
= 0; i
< MAX_NR_ZONES
; i
++) {
109 struct zone
*z
= &pg
->node_zones
[i
];
110 for_each_online_cpu(cpu
) {
111 struct per_cpu_pageset
*ps
= zone_pcp(z
,cpu
);
112 numa_hit
+= ps
->numa_hit
;
113 numa_miss
+= ps
->numa_miss
;
114 numa_foreign
+= ps
->numa_foreign
;
115 interleave_hit
+= ps
->interleave_hit
;
116 local_node
+= ps
->local_node
;
117 other_node
+= ps
->other_node
;
124 "interleave_hit %lu\n"
134 static SYSDEV_ATTR(numastat
, S_IRUGO
, node_read_numastat
, NULL
);
136 static ssize_t
node_read_distance(struct sys_device
* dev
, char * buf
)
142 /* buf currently PAGE_SIZE, need ~4 chars per node */
143 BUILD_BUG_ON(MAX_NUMNODES
*4 > PAGE_SIZE
/2);
145 for_each_online_node(i
)
146 len
+= sprintf(buf
+ len
, "%s%d", i
? " " : "", node_distance(nid
, i
));
148 len
+= sprintf(buf
+ len
, "\n");
151 static SYSDEV_ATTR(distance
, S_IRUGO
, node_read_distance
, NULL
);
155 * register_node - Setup a driverfs device for a node.
156 * @num - Node number to use when creating the device.
158 * Initialize and register the node device.
160 int register_node(struct node
*node
, int num
, struct node
*parent
)
164 node
->sysdev
.id
= num
;
165 node
->sysdev
.cls
= &node_class
;
166 error
= sysdev_register(&node
->sysdev
);
169 sysdev_create_file(&node
->sysdev
, &attr_cpumap
);
170 sysdev_create_file(&node
->sysdev
, &attr_meminfo
);
171 sysdev_create_file(&node
->sysdev
, &attr_numastat
);
172 sysdev_create_file(&node
->sysdev
, &attr_distance
);
178 * unregister_node - unregister a node device
179 * @node: node going away
181 * Unregisters a node device @node. All the devices on the node must be
182 * unregistered before calling this function.
184 void unregister_node(struct node
*node
)
186 sysdev_remove_file(&node
->sysdev
, &attr_cpumap
);
187 sysdev_remove_file(&node
->sysdev
, &attr_meminfo
);
188 sysdev_remove_file(&node
->sysdev
, &attr_numastat
);
189 sysdev_remove_file(&node
->sysdev
, &attr_distance
);
191 sysdev_unregister(&node
->sysdev
);
194 struct node node_devices
[MAX_NUMNODES
];
197 * register cpu under node
199 int register_cpu_under_node(unsigned int cpu
, unsigned int nid
)
201 if (node_online(nid
)) {
202 struct sys_device
*obj
= get_cpu_sysdev(cpu
);
205 return sysfs_create_link(&node_devices
[nid
].sysdev
.kobj
,
207 kobject_name(&obj
->kobj
));
213 int unregister_cpu_under_node(unsigned int cpu
, unsigned int nid
)
215 if (node_online(nid
)) {
216 struct sys_device
*obj
= get_cpu_sysdev(cpu
);
218 sysfs_remove_link(&node_devices
[nid
].sysdev
.kobj
,
219 kobject_name(&obj
->kobj
));
224 int register_one_node(int nid
)
229 if (node_online(nid
)) {
230 int p_node
= parent_node(nid
);
231 struct node
*parent
= NULL
;
234 parent
= &node_devices
[p_node
];
236 error
= register_node(&node_devices
[nid
], nid
, parent
);
238 /* link cpu under this node */
239 for_each_present_cpu(cpu
) {
240 if (cpu_to_node(cpu
) == nid
)
241 register_cpu_under_node(cpu
, nid
);
249 void unregister_one_node(int nid
)
251 unregister_node(&node_devices
[nid
]);
254 static int __init
register_node_type(void)
256 return sysdev_class_register(&node_class
);
258 postcore_initcall(register_node_type
);