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);