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 #ifdef CONFIG_HIGHMEM
  58                        "Node %d HighTotal:    %8lu kB\n"
  59                        "Node %d HighFree:     %8lu kB\n"
  60                        "Node %d LowTotal:     %8lu kB\n"
  61                        "Node %d LowFree:      %8lu kB\n"
  62 #endif
  63                        "Node %d Dirty:        %8lu kB\n"
  64                        "Node %d Writeback:    %8lu kB\n"
  65                        "Node %d FilePages:    %8lu kB\n"
  66                        "Node %d Mapped:       %8lu kB\n"
  67                        "Node %d AnonPages:    %8lu kB\n"
  68                        "Node %d PageTables:   %8lu kB\n"
  69                        "Node %d NFS_Unstable: %8lu kB\n"
  70                        "Node %d Bounce:       %8lu kB\n"
  71                        "Node %d Slab:         %8lu kB\n"
  72                        "Node %d SReclaimable: %8lu kB\n"
  73                        "Node %d SUnreclaim:   %8lu kB\n",
  74                        nid, K(i.totalram),
  75                        nid, K(i.freeram),
  76                        nid, K(i.totalram - i.freeram),
  77                        nid, K(active),
  78                        nid, K(inactive),
  79 #ifdef CONFIG_HIGHMEM
  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 #endif
  85                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
  86                        nid, K(node_page_state(nid, NR_WRITEBACK)),
  87                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
  88                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
  89                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
  90                        nid, K(node_page_state(nid, NR_PAGETABLE)),
  91                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
  92                        nid, K(node_page_state(nid, NR_BOUNCE)),
  93                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
  94                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
  95                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
  96                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
  97         n += hugetlb_report_node_meminfo(nid, buf + n);
  98         return n;
  99 }
 100
 101 #undef K
 102 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
 103
 104 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
 105 {
 106         return sprintf(buf,
 107                        "numa_hit %lu\n"
 108                        "numa_miss %lu\n"
 109                        "numa_foreign %lu\n"
 110                        "interleave_hit %lu\n"
 111                        "local_node %lu\n"
 112                        "other_node %lu\n",
 113                        node_page_state(dev->id, NUMA_HIT),
 114                        node_page_state(dev->id, NUMA_MISS),
 115                        node_page_state(dev->id, NUMA_FOREIGN),
 116                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
 117                        node_page_state(dev->id, NUMA_LOCAL),
 118                        node_page_state(dev->id, NUMA_OTHER));
 119 }
 120 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 121
 122 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 123 {
 124         int nid = dev->id;
 125         int len = 0;
 126         int i;
 127
 128         /* buf currently PAGE_SIZE, need ~4 chars per node */
 129         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 130
 131         for_each_online_node(i)
 132                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 133
 134         len += sprintf(buf + len, "\n");
 135         return len;
 136 }
 137 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 138
 139
 140 /*
 141  * register_node - Setup a driverfs device for a node.
 142  * @num - Node number to use when creating the device.
 143  *
 144  * Initialize and register the node device.
 145  */
 146 int register_node(struct node *node, int num, struct node *parent)
 147 {
 148         int error;
 149
 150         node->sysdev.id = num;
 151         node->sysdev.cls = &node_class;
 152         error = sysdev_register(&node->sysdev);
 153
 154         if (!error){
 155                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 156                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 157                 sysdev_create_file(&node->sysdev, &attr_numastat);
 158                 sysdev_create_file(&node->sysdev, &attr_distance);
 159         }
 160         return error;
 161 }
 162
 163 /**
 164  * unregister_node - unregister a node device
 165  * @node: node going away
 166  *
 167  * Unregisters a node device @node.  All the devices on the node must be
 168  * unregistered before calling this function.
 169  */
 170 void unregister_node(struct node *node)
 171 {
 172         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 173         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 174         sysdev_remove_file(&node->sysdev, &attr_numastat);
 175         sysdev_remove_file(&node->sysdev, &attr_distance);
 176
 177         sysdev_unregister(&node->sysdev);
 178 }
 179
 180 struct node node_devices[MAX_NUMNODES];
 181
 182 /*
 183  * register cpu under node
 184  */
 185 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 186 {
 187         if (node_online(nid)) {
 188                 struct sys_device *obj = get_cpu_sysdev(cpu);
 189                 if (!obj)
 190                         return 0;
 191                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 192                                          &obj->kobj,
 193                                          kobject_name(&obj->kobj));
 194          }
 195
 196         return 0;
 197 }
 198
 199 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 200 {
 201         if (node_online(nid)) {
 202                 struct sys_device *obj = get_cpu_sysdev(cpu);
 203                 if (obj)
 204                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 205                                          kobject_name(&obj->kobj));
 206         }
 207         return 0;
 208 }
 209
 210 int register_one_node(int nid)
 211 {
 212         int error = 0;
 213         int cpu;
 214
 215         if (node_online(nid)) {
 216                 int p_node = parent_node(nid);
 217                 struct node *parent = NULL;
 218
 219                 if (p_node != nid)
 220                         parent = &node_devices[p_node];
 221
 222                 error = register_node(&node_devices[nid], nid, parent);
 223
 224                 /* link cpu under this node */
 225                 for_each_present_cpu(cpu) {
 226                         if (cpu_to_node(cpu) == nid)
 227                                 register_cpu_under_node(cpu, nid);
 228                 }
 229         }
 230
 231         return error;
 232
 233 }
 234
 235 void unregister_one_node(int nid)
 236 {
 237         unregister_node(&node_devices[nid]);
 238 }
 239
 240 static int __init register_node_type(void)
 241 {
 242         return sysdev_class_register(&node_class);
 243 }
 244 postcore_initcall(register_node_type);