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         unsigned long inactive;
  44         unsigned long active;
  45         unsigned long free;
  46
  47         si_meminfo_node(&i, nid);
  48         __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
  49
  50
  51         n = sprintf(buf, "\n"
  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",
  70                        nid, K(i.totalram),
  71                        nid, K(i.freeram),
  72                        nid, K(i.totalram - i.freeram),
  73                        nid, K(active),
  74                        nid, K(inactive),
  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                        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);
  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         return sprintf(buf,
  98                        "numa_hit %lu\n"
  99                        "numa_miss %lu\n"
 100                        "numa_foreign %lu\n"
 101                        "interleave_hit %lu\n"
 102                        "local_node %lu\n"
 103                        "other_node %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));
 110 }
 111 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 112
 113 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 114 {
 115         int nid = dev->id;
 116         int len = 0;
 117         int i;
 118
 119         /* buf currently PAGE_SIZE, need ~4 chars per node */
 120         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 121
 122         for_each_online_node(i)
 123                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 124
 125         len += sprintf(buf + len, "\n");
 126         return len;
 127 }
 128 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 129
 130
 131 /*
 132  * register_node - Setup a driverfs device for a node.
 133  * @num - Node number to use when creating the device.
 134  *
 135  * Initialize and register the node device.
 136  */
 137 int register_node(struct node *node, int num, struct node *parent)
 138 {
 139         int error;
 140
 141         node->sysdev.id = num;
 142         node->sysdev.cls = &node_class;
 143         error = sysdev_register(&node->sysdev);
 144
 145         if (!error){
 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);
 150         }
 151         return error;
 152 }
 153
 154 /**
 155  * unregister_node - unregister a node device
 156  * @node: node going away
 157  *
 158  * Unregisters a node device @node.  All the devices on the node must be
 159  * unregistered before calling this function.
 160  */
 161 void unregister_node(struct node *node)
 162 {
 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);
 167
 168         sysdev_unregister(&node->sysdev);
 169 }
 170
 171 struct node node_devices[MAX_NUMNODES];
 172
 173 /*
 174  * register cpu under node
 175  */
 176 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 177 {
 178         if (node_online(nid)) {
 179                 struct sys_device *obj = get_cpu_sysdev(cpu);
 180                 if (!obj)
 181                         return 0;
 182                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 183                                          &obj->kobj,
 184                                          kobject_name(&obj->kobj));
 185          }
 186
 187         return 0;
 188 }
 189
 190 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 191 {
 192         if (node_online(nid)) {
 193                 struct sys_device *obj = get_cpu_sysdev(cpu);
 194                 if (obj)
 195                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 196                                          kobject_name(&obj->kobj));
 197         }
 198         return 0;
 199 }
 200
 201 int register_one_node(int nid)
 202 {
 203         int error = 0;
 204         int cpu;
 205
 206         if (node_online(nid)) {
 207                 int p_node = parent_node(nid);
 208                 struct node *parent = NULL;
 209
 210                 if (p_node != nid)
 211                         parent = &node_devices[p_node];
 212
 213                 error = register_node(&node_devices[nid], nid, parent);
 214
 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);
 219                 }
 220         }
 221
 222         return error;
 223
 224 }
 225
 226 void unregister_one_node(int nid)
 227 {
 228         unregister_node(&node_devices[nid]);
 229 }
 230
 231 static int __init register_node_type(void)
 232 {
 233         return sysdev_class_register(&node_class);
 234 }
 235 postcore_initcall(register_node_type);