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         struct page_state ps;
  44         unsigned long inactive;
  45         unsigned long active;
  46         unsigned long free;
  47
  48         si_meminfo_node(&i, nid);
  49         get_page_state_node(&ps, nid);
  50         __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
  51
  52         /* Check for negative values in these approximate counters */
  53         if ((long)ps.nr_dirty < 0)
  54                 ps.nr_dirty = 0;
  55         if ((long)ps.nr_writeback < 0)
  56                 ps.nr_writeback = 0;
  57         if ((long)ps.nr_slab < 0)
  58                 ps.nr_slab = 0;
  59
  60         n = sprintf(buf, "\n"
  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 Mapped:       %8lu kB\n"
  73                        "Node %d Slab:         %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                        nid, K(i.totalhigh),
  80                        nid, K(i.freehigh),
  81                        nid, K(i.totalram - i.totalhigh),
  82                        nid, K(i.freeram - i.freehigh),
  83                        nid, K(ps.nr_dirty),
  84                        nid, K(ps.nr_writeback),
  85                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
  86                        nid, K(ps.nr_slab));
  87         n += hugetlb_report_node_meminfo(nid, buf + n);
  88         return n;
  89 }
  90
  91 #undef K
  92 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
  93
  94 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
  95 {
  96         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
  97         unsigned long local_node, other_node;
  98         int i, cpu;
  99         pg_data_t *pg = NODE_DATA(dev->id);
 100         numa_hit = 0;
 101         numa_miss = 0;
 102         interleave_hit = 0;
 103         numa_foreign = 0;
 104         local_node = 0;
 105         other_node = 0;
 106         for (i = 0; i < MAX_NR_ZONES; i++) {
 107                 struct zone *z = &pg->node_zones[i];
 108                 for_each_online_cpu(cpu) {
 109                         struct per_cpu_pageset *ps = zone_pcp(z,cpu);
 110                         numa_hit += ps->numa_hit;
 111                         numa_miss += ps->numa_miss;
 112                         numa_foreign += ps->numa_foreign;
 113                         interleave_hit += ps->interleave_hit;
 114                         local_node += ps->local_node;
 115                         other_node += ps->other_node;
 116                 }
 117         }
 118         return sprintf(buf,
 119                        "numa_hit %lu\n"
 120                        "numa_miss %lu\n"
 121                        "numa_foreign %lu\n"
 122                        "interleave_hit %lu\n"
 123                        "local_node %lu\n"
 124                        "other_node %lu\n",
 125                        numa_hit,
 126                        numa_miss,
 127                        numa_foreign,
 128                        interleave_hit,
 129                        local_node,
 130                        other_node);
 131 }
 132 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 133
 134 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 135 {
 136         int nid = dev->id;
 137         int len = 0;
 138         int i;
 139
 140         /* buf currently PAGE_SIZE, need ~4 chars per node */
 141         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 142
 143         for_each_online_node(i)
 144                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 145
 146         len += sprintf(buf + len, "\n");
 147         return len;
 148 }
 149 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 150
 151
 152 /*
 153  * register_node - Setup a driverfs device for a node.
 154  * @num - Node number to use when creating the device.
 155  *
 156  * Initialize and register the node device.
 157  */
 158 int register_node(struct node *node, int num, struct node *parent)
 159 {
 160         int error;
 161
 162         node->sysdev.id = num;
 163         node->sysdev.cls = &node_class;
 164         error = sysdev_register(&node->sysdev);
 165
 166         if (!error){
 167                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 168                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 169                 sysdev_create_file(&node->sysdev, &attr_numastat);
 170                 sysdev_create_file(&node->sysdev, &attr_distance);
 171         }
 172         return error;
 173 }
 174
 175 /**
 176  * unregister_node - unregister a node device
 177  * @node: node going away
 178  *
 179  * Unregisters a node device @node.  All the devices on the node must be
 180  * unregistered before calling this function.
 181  */
 182 void unregister_node(struct node *node)
 183 {
 184         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 185         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 186         sysdev_remove_file(&node->sysdev, &attr_numastat);
 187         sysdev_remove_file(&node->sysdev, &attr_distance);
 188
 189         sysdev_unregister(&node->sysdev);
 190 }
 191
 192 struct node node_devices[MAX_NUMNODES];
 193
 194 /*
 195  * register cpu under node
 196  */
 197 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 198 {
 199         if (node_online(nid)) {
 200                 struct sys_device *obj = get_cpu_sysdev(cpu);
 201                 if (!obj)
 202                         return 0;
 203                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 204                                          &obj->kobj,
 205                                          kobject_name(&obj->kobj));
 206          }
 207
 208         return 0;
 209 }
 210
 211 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 212 {
 213         if (node_online(nid)) {
 214                 struct sys_device *obj = get_cpu_sysdev(cpu);
 215                 if (obj)
 216                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 217                                          kobject_name(&obj->kobj));
 218         }
 219         return 0;
 220 }
 221
 222 int register_one_node(int nid)
 223 {
 224         int error = 0;
 225         int cpu;
 226
 227         if (node_online(nid)) {
 228                 int p_node = parent_node(nid);
 229                 struct node *parent = NULL;
 230
 231                 if (p_node != nid)
 232                         parent = &node_devices[p_node];
 233
 234                 error = register_node(&node_devices[nid], nid, parent);
 235
 236                 /* link cpu under this node */
 237                 for_each_present_cpu(cpu) {
 238                         if (cpu_to_node(cpu) == nid)
 239                                 register_cpu_under_node(cpu, nid);
 240                 }
 241         }
 242
 243         return error;
 244
 245 }
 246
 247 void unregister_one_node(int nid)
 248 {
 249         unregister_node(&node_devices[nid]);
 250 }
 251
 252 static int __init register_node_type(void)
 253 {
 254         return sysdev_class_register(&node_class);
 255 }
 256 postcore_initcall(register_node_type);