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_mapped < 0)
  58                 ps.nr_mapped = 0;
  59         if ((long)ps.nr_slab < 0)
  60                 ps.nr_slab = 0;
  61
  62         n = sprintf(buf, "\n"
  63                        "Node %d MemTotal:     %8lu kB\n"
  64                        "Node %d MemFree:      %8lu kB\n"
  65                        "Node %d MemUsed:      %8lu kB\n"
  66                        "Node %d Active:       %8lu kB\n"
  67                        "Node %d Inactive:     %8lu kB\n"
  68                        "Node %d HighTotal:    %8lu kB\n"
  69                        "Node %d HighFree:     %8lu kB\n"
  70                        "Node %d LowTotal:     %8lu kB\n"
  71                        "Node %d LowFree:      %8lu kB\n"
  72                        "Node %d Dirty:        %8lu kB\n"
  73                        "Node %d Writeback:    %8lu kB\n"
  74                        "Node %d Mapped:       %8lu kB\n"
  75                        "Node %d Slab:         %8lu kB\n",
  76                        nid, K(i.totalram),
  77                        nid, K(i.freeram),
  78                        nid, K(i.totalram - i.freeram),
  79                        nid, K(active),
  80                        nid, K(inactive),
  81                        nid, K(i.totalhigh),
  82                        nid, K(i.freehigh),
  83                        nid, K(i.totalram - i.totalhigh),
  84                        nid, K(i.freeram - i.freehigh),
  85                        nid, K(ps.nr_dirty),
  86                        nid, K(ps.nr_writeback),
  87                        nid, K(ps.nr_mapped),
  88                        nid, K(ps.nr_slab));
  89         n += hugetlb_report_node_meminfo(nid, buf + n);
  90         return n;
  91 }
  92
  93 #undef K
  94 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
  95
  96 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
  97 {
  98         unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
  99         unsigned long local_node, other_node;
 100         int i, cpu;
 101         pg_data_t *pg = NODE_DATA(dev->id);
 102         numa_hit = 0;
 103         numa_miss = 0;
 104         interleave_hit = 0;
 105         numa_foreign = 0;
 106         local_node = 0;
 107         other_node = 0;
 108         for (i = 0; i < MAX_NR_ZONES; i++) {
 109                 struct zone *z = &pg->node_zones[i];
 110                 for_each_online_cpu(cpu) {
 111                         struct per_cpu_pageset *ps = zone_pcp(z,cpu);
 112                         numa_hit += ps->numa_hit;
 113                         numa_miss += ps->numa_miss;
 114                         numa_foreign += ps->numa_foreign;
 115                         interleave_hit += ps->interleave_hit;
 116                         local_node += ps->local_node;
 117                         other_node += ps->other_node;
 118                 }
 119         }
 120         return sprintf(buf,
 121                        "numa_hit %lu\n"
 122                        "numa_miss %lu\n"
 123                        "numa_foreign %lu\n"
 124                        "interleave_hit %lu\n"
 125                        "local_node %lu\n"
 126                        "other_node %lu\n",
 127                        numa_hit,
 128                        numa_miss,
 129                        numa_foreign,
 130                        interleave_hit,
 131                        local_node,
 132                        other_node);
 133 }
 134 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 135
 136 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 137 {
 138         int nid = dev->id;
 139         int len = 0;
 140         int i;
 141
 142         /* buf currently PAGE_SIZE, need ~4 chars per node */
 143         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 144
 145         for_each_online_node(i)
 146                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 147
 148         len += sprintf(buf + len, "\n");
 149         return len;
 150 }
 151 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 152
 153
 154 /*
 155  * register_node - Setup a driverfs device for a node.
 156  * @num - Node number to use when creating the device.
 157  *
 158  * Initialize and register the node device.
 159  */
 160 int register_node(struct node *node, int num, struct node *parent)
 161 {
 162         int error;
 163
 164         node->sysdev.id = num;
 165         node->sysdev.cls = &node_class;
 166         error = sysdev_register(&node->sysdev);
 167
 168         if (!error){
 169                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 170                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 171                 sysdev_create_file(&node->sysdev, &attr_numastat);
 172                 sysdev_create_file(&node->sysdev, &attr_distance);
 173         }
 174         return error;
 175 }
 176
 177 /**
 178  * unregister_node - unregister a node device
 179  * @node: node going away
 180  *
 181  * Unregisters a node device @node.  All the devices on the node must be
 182  * unregistered before calling this function.
 183  */
 184 void unregister_node(struct node *node)
 185 {
 186         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 187         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 188         sysdev_remove_file(&node->sysdev, &attr_numastat);
 189         sysdev_remove_file(&node->sysdev, &attr_distance);
 190
 191         sysdev_unregister(&node->sysdev);
 192 }
 193
 194 struct node node_devices[MAX_NUMNODES];
 195
 196 /*
 197  * register cpu under node
 198  */
 199 int register_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                         return 0;
 205                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 206                                          &obj->kobj,
 207                                          kobject_name(&obj->kobj));
 208          }
 209
 210         return 0;
 211 }
 212
 213 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 214 {
 215         if (node_online(nid)) {
 216                 struct sys_device *obj = get_cpu_sysdev(cpu);
 217                 if (obj)
 218                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 219                                          kobject_name(&obj->kobj));
 220         }
 221         return 0;
 222 }
 223
 224 int register_one_node(int nid)
 225 {
 226         int error = 0;
 227         int cpu;
 228
 229         if (node_online(nid)) {
 230                 int p_node = parent_node(nid);
 231                 struct node *parent = NULL;
 232
 233                 if (p_node != nid)
 234                         parent = &node_devices[p_node];
 235
 236                 error = register_node(&node_devices[nid], nid, parent);
 237
 238                 /* link cpu under this node */
 239                 for_each_present_cpu(cpu) {
 240                         if (cpu_to_node(cpu) == nid)
 241                                 register_cpu_under_node(cpu, nid);
 242                 }
 243         }
 244
 245         return error;
 246
 247 }
 248
 249 void unregister_one_node(int nid)
 250 {
 251         unregister_node(&node_devices[nid]);
 252 }
 253
 254 static int __init register_node_type(void)
 255 {
 256         return sysdev_class_register(&node_class);
 257 }
 258 postcore_initcall(register_node_type);