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 #include <linux/device.h>
  16
  17 static struct sysdev_class node_class = {
  18         set_kset_name("node"),
  19 };
  20
  21
  22 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
  23 {
  24         struct node *node_dev = to_node(dev);
  25         cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
  26         int len;
  27
  28         /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
  29         BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
  30
  31         len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
  32         len += sprintf(buf + len, "\n");
  33         return len;
  34 }
  35
  36 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
  37
  38 #define K(x) ((x) << (PAGE_SHIFT - 10))
  39 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
  40 {
  41         int n;
  42         int nid = dev->id;
  43         struct sysinfo i;
  44
  45         si_meminfo_node(&i, nid);
  46
  47         n = sprintf(buf, "\n"
  48                        "Node %d MemTotal:     %8lu kB\n"
  49                        "Node %d MemFree:      %8lu kB\n"
  50                        "Node %d MemUsed:      %8lu kB\n"
  51                        "Node %d Active:       %8lu kB\n"
  52                        "Node %d Inactive:     %8lu kB\n"
  53 #ifdef CONFIG_HIGHMEM
  54                        "Node %d HighTotal:    %8lu kB\n"
  55                        "Node %d HighFree:     %8lu kB\n"
  56                        "Node %d LowTotal:     %8lu kB\n"
  57                        "Node %d LowFree:      %8lu kB\n"
  58 #endif
  59                        "Node %d Dirty:        %8lu kB\n"
  60                        "Node %d Writeback:    %8lu kB\n"
  61                        "Node %d FilePages:    %8lu kB\n"
  62                        "Node %d Mapped:       %8lu kB\n"
  63                        "Node %d AnonPages:    %8lu kB\n"
  64                        "Node %d PageTables:   %8lu kB\n"
  65                        "Node %d NFS_Unstable: %8lu kB\n"
  66                        "Node %d Bounce:       %8lu kB\n"
  67                        "Node %d Slab:         %8lu kB\n"
  68                        "Node %d SReclaimable: %8lu kB\n"
  69                        "Node %d SUnreclaim:   %8lu kB\n",
  70                        nid, K(i.totalram),
  71                        nid, K(i.freeram),
  72                        nid, K(i.totalram - i.freeram),
  73                        nid, node_page_state(nid, NR_ACTIVE),
  74                        nid, node_page_state(nid, NR_INACTIVE),
  75 #ifdef CONFIG_HIGHMEM
  76                        nid, K(i.totalhigh),
  77                        nid, K(i.freehigh),
  78                        nid, K(i.totalram - i.totalhigh),
  79                        nid, K(i.freeram - i.freehigh),
  80 #endif
  81                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
  82                        nid, K(node_page_state(nid, NR_WRITEBACK)),
  83                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
  84                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
  85                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
  86                        nid, K(node_page_state(nid, NR_PAGETABLE)),
  87                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
  88                        nid, K(node_page_state(nid, NR_BOUNCE)),
  89                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
  90                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
  91                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
  92                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
  93         n += hugetlb_report_node_meminfo(nid, buf + n);
  94         return n;
  95 }
  96
  97 #undef K
  98 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
  99
 100 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
 101 {
 102         return sprintf(buf,
 103                        "numa_hit %lu\n"
 104                        "numa_miss %lu\n"
 105                        "numa_foreign %lu\n"
 106                        "interleave_hit %lu\n"
 107                        "local_node %lu\n"
 108                        "other_node %lu\n",
 109                        node_page_state(dev->id, NUMA_HIT),
 110                        node_page_state(dev->id, NUMA_MISS),
 111                        node_page_state(dev->id, NUMA_FOREIGN),
 112                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
 113                        node_page_state(dev->id, NUMA_LOCAL),
 114                        node_page_state(dev->id, NUMA_OTHER));
 115 }
 116 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 117
 118 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 119 {
 120         int nid = dev->id;
 121         int len = 0;
 122         int i;
 123
 124         /* buf currently PAGE_SIZE, need ~4 chars per node */
 125         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 126
 127         for_each_online_node(i)
 128                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 129
 130         len += sprintf(buf + len, "\n");
 131         return len;
 132 }
 133 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 134
 135
 136 /*
 137  * register_node - Setup a sysfs device for a node.
 138  * @num - Node number to use when creating the device.
 139  *
 140  * Initialize and register the node device.
 141  */
 142 int register_node(struct node *node, int num, struct node *parent)
 143 {
 144         int error;
 145
 146         node->sysdev.id = num;
 147         node->sysdev.cls = &node_class;
 148         error = sysdev_register(&node->sysdev);
 149
 150         if (!error){
 151                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 152                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 153                 sysdev_create_file(&node->sysdev, &attr_numastat);
 154                 sysdev_create_file(&node->sysdev, &attr_distance);
 155         }
 156         return error;
 157 }
 158
 159 /**
 160  * unregister_node - unregister a node device
 161  * @node: node going away
 162  *
 163  * Unregisters a node device @node.  All the devices on the node must be
 164  * unregistered before calling this function.
 165  */
 166 void unregister_node(struct node *node)
 167 {
 168         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 169         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 170         sysdev_remove_file(&node->sysdev, &attr_numastat);
 171         sysdev_remove_file(&node->sysdev, &attr_distance);
 172
 173         sysdev_unregister(&node->sysdev);
 174 }
 175
 176 struct node node_devices[MAX_NUMNODES];
 177
 178 /*
 179  * register cpu under node
 180  */
 181 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 182 {
 183         if (node_online(nid)) {
 184                 struct sys_device *obj = get_cpu_sysdev(cpu);
 185                 if (!obj)
 186                         return 0;
 187                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 188                                          &obj->kobj,
 189                                          kobject_name(&obj->kobj));
 190          }
 191
 192         return 0;
 193 }
 194
 195 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 196 {
 197         if (node_online(nid)) {
 198                 struct sys_device *obj = get_cpu_sysdev(cpu);
 199                 if (obj)
 200                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 201                                          kobject_name(&obj->kobj));
 202         }
 203         return 0;
 204 }
 205
 206 int register_one_node(int nid)
 207 {
 208         int error = 0;
 209         int cpu;
 210
 211         if (node_online(nid)) {
 212                 int p_node = parent_node(nid);
 213                 struct node *parent = NULL;
 214
 215                 if (p_node != nid)
 216                         parent = &node_devices[p_node];
 217
 218                 error = register_node(&node_devices[nid], nid, parent);
 219
 220                 /* link cpu under this node */
 221                 for_each_present_cpu(cpu) {
 222                         if (cpu_to_node(cpu) == nid)
 223                                 register_cpu_under_node(cpu, nid);
 224                 }
 225         }
 226
 227         return error;
 228
 229 }
 230
 231 void unregister_one_node(int nid)
 232 {
 233         unregister_node(&node_devices[nid]);
 234 }
 235
 236 /*
 237  * node states attributes
 238  */
 239
 240 static ssize_t print_nodes_state(enum node_states state, char *buf)
 241 {
 242         int n;
 243
 244         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
 245         if (n > 0 && PAGE_SIZE > n + 1) {
 246                 *(buf + n++) = '\n';
 247                 *(buf + n++) = '\0';
 248         }
 249         return n;
 250 }
 251
 252 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
 253 {
 254         return print_nodes_state(N_POSSIBLE, buf);
 255 }
 256
 257 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
 258 {
 259         return print_nodes_state(N_ONLINE, buf);
 260 }
 261
 262 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
 263                                                 char *buf)
 264 {
 265         return print_nodes_state(N_NORMAL_MEMORY, buf);
 266 }
 267
 268 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
 269 {
 270         return print_nodes_state(N_CPU, buf);
 271 }
 272
 273 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
 274 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
 275 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
 276                                                                         NULL);
 277 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
 278
 279 #ifdef CONFIG_HIGHMEM
 280 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
 281                                                  char *buf)
 282 {
 283         return print_nodes_state(N_HIGH_MEMORY, buf);
 284 }
 285
 286 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
 287                                                                          NULL);
 288 #endif
 289
 290 struct sysdev_class_attribute *node_state_attr[] = {
 291         &attr_possible,
 292         &attr_online,
 293         &attr_has_normal_memory,
 294 #ifdef CONFIG_HIGHMEM
 295         &attr_has_high_memory,
 296 #endif
 297         &attr_has_cpu,
 298 };
 299
 300 static int node_states_init(void)
 301 {
 302         int i;
 303         int err = 0;
 304
 305         for (i = 0;  i < NR_NODE_STATES; i++) {
 306                 int ret;
 307                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
 308                 if (!err)
 309                         err = ret;
 310         }
 311         return err;
 312 }
 313
 314 static int __init register_node_type(void)
 315 {
 316         int ret;
 317
 318         ret = sysdev_class_register(&node_class);
 319         if (!ret)
 320                 ret = node_states_init();
 321
 322         /*
 323          * Note:  we're not going to unregister the node class if we fail
 324          * to register the node state class attribute files.
 325          */
 326         return ret;
 327 }
 328 postcore_initcall(register_node_type);