xref: /openbmc/linux/drivers/base/node.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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 
15 static struct sysdev_class node_class = {
16 	set_kset_name("node"),
17 };
18 
19 
20 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
21 {
22 	struct node *node_dev = to_node(dev);
23 	cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
24 	int len;
25 
26 	/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
27 	BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
28 
29 	len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
30 	len += sprintf(buf + len, "\n");
31 	return len;
32 }
33 
34 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
35 
36 #define K(x) ((x) << (PAGE_SHIFT - 10))
37 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
38 {
39 	int n;
40 	int nid = dev->id;
41 	struct sysinfo i;
42 	struct page_state ps;
43 	unsigned long inactive;
44 	unsigned long active;
45 	unsigned long free;
46 
47 	si_meminfo_node(&i, nid);
48 	get_page_state_node(&ps, nid);
49 	__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
50 
51 	/* Check for negative values in these approximate counters */
52 	if ((long)ps.nr_dirty < 0)
53 		ps.nr_dirty = 0;
54 	if ((long)ps.nr_writeback < 0)
55 		ps.nr_writeback = 0;
56 	if ((long)ps.nr_mapped < 0)
57 		ps.nr_mapped = 0;
58 	if ((long)ps.nr_slab < 0)
59 		ps.nr_slab = 0;
60 
61 	n = sprintf(buf, "\n"
62 		       "Node %d MemTotal:     %8lu kB\n"
63 		       "Node %d MemFree:      %8lu kB\n"
64 		       "Node %d MemUsed:      %8lu kB\n"
65 		       "Node %d Active:       %8lu kB\n"
66 		       "Node %d Inactive:     %8lu kB\n"
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 		       "Node %d Dirty:        %8lu kB\n"
72 		       "Node %d Writeback:    %8lu kB\n"
73 		       "Node %d Mapped:       %8lu kB\n"
74 		       "Node %d Slab:         %8lu kB\n",
75 		       nid, K(i.totalram),
76 		       nid, K(i.freeram),
77 		       nid, K(i.totalram - i.freeram),
78 		       nid, K(active),
79 		       nid, K(inactive),
80 		       nid, K(i.totalhigh),
81 		       nid, K(i.freehigh),
82 		       nid, K(i.totalram - i.totalhigh),
83 		       nid, K(i.freeram - i.freehigh),
84 		       nid, K(ps.nr_dirty),
85 		       nid, K(ps.nr_writeback),
86 		       nid, K(ps.nr_mapped),
87 		       nid, K(ps.nr_slab));
88 	n += hugetlb_report_node_meminfo(nid, buf + n);
89 	return n;
90 }
91 
92 #undef K
93 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
94 
95 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
96 {
97 	unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
98 	unsigned long local_node, other_node;
99 	int i, cpu;
100 	pg_data_t *pg = NODE_DATA(dev->id);
101 	numa_hit = 0;
102 	numa_miss = 0;
103 	interleave_hit = 0;
104 	numa_foreign = 0;
105 	local_node = 0;
106 	other_node = 0;
107 	for (i = 0; i < MAX_NR_ZONES; i++) {
108 		struct zone *z = &pg->node_zones[i];
109 		for (cpu = 0; cpu < NR_CPUS; cpu++) {
110 			struct per_cpu_pageset *ps = zone_pcp(z,cpu);
111 			numa_hit += ps->numa_hit;
112 			numa_miss += ps->numa_miss;
113 			numa_foreign += ps->numa_foreign;
114 			interleave_hit += ps->interleave_hit;
115 			local_node += ps->local_node;
116 			other_node += ps->other_node;
117 		}
118 	}
119 	return sprintf(buf,
120 		       "numa_hit %lu\n"
121 		       "numa_miss %lu\n"
122 		       "numa_foreign %lu\n"
123 		       "interleave_hit %lu\n"
124 		       "local_node %lu\n"
125 		       "other_node %lu\n",
126 		       numa_hit,
127 		       numa_miss,
128 		       numa_foreign,
129 		       interleave_hit,
130 		       local_node,
131 		       other_node);
132 }
133 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
134 
135 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
136 {
137 	int nid = dev->id;
138 	int len = 0;
139 	int i;
140 
141 	/* buf currently PAGE_SIZE, need ~4 chars per node */
142 	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
143 
144 	for_each_online_node(i)
145 		len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
146 
147 	len += sprintf(buf + len, "\n");
148 	return len;
149 }
150 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
151 
152 
153 /*
154  * register_node - Setup a driverfs device for a node.
155  * @num - Node number to use when creating the device.
156  *
157  * Initialize and register the node device.
158  */
159 int register_node(struct node *node, int num, struct node *parent)
160 {
161 	int error;
162 
163 	node->sysdev.id = num;
164 	node->sysdev.cls = &node_class;
165 	error = sysdev_register(&node->sysdev);
166 
167 	if (!error){
168 		sysdev_create_file(&node->sysdev, &attr_cpumap);
169 		sysdev_create_file(&node->sysdev, &attr_meminfo);
170 		sysdev_create_file(&node->sysdev, &attr_numastat);
171 		sysdev_create_file(&node->sysdev, &attr_distance);
172 	}
173 	return error;
174 }
175 
176 /**
177  * unregister_node - unregister a node device
178  * @node: node going away
179  *
180  * Unregisters a node device @node.  All the devices on the node must be
181  * unregistered before calling this function.
182  */
183 void unregister_node(struct node *node)
184 {
185 	sysdev_remove_file(&node->sysdev, &attr_cpumap);
186 	sysdev_remove_file(&node->sysdev, &attr_meminfo);
187 	sysdev_remove_file(&node->sysdev, &attr_numastat);
188 	sysdev_remove_file(&node->sysdev, &attr_distance);
189 
190 	sysdev_unregister(&node->sysdev);
191 }
192 
193 static int __init register_node_type(void)
194 {
195 	return sysdev_class_register(&node_class);
196 }
197 postcore_initcall(register_node_type);
198