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         .name = "node",
  19 };
  20
  21
  22 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
  23 {
  24         struct node *node_dev = to_node(dev);
  25         node_to_cpumask_ptr(mask, node_dev->sysdev.id);
  26         int len;
  27
  28         /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
  29         BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
  30
  31         len = type?
  32                 cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
  33                 cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
  34         buf[len++] = '\n';
  35         buf[len] = '\0';
  36         return len;
  37 }
  38
  39 static inline ssize_t node_read_cpumask(struct sys_device *dev,
  40                                 struct sysdev_attribute *attr, char *buf)
  41 {
  42         return node_read_cpumap(dev, 0, buf);
  43 }
  44 static inline ssize_t node_read_cpulist(struct sys_device *dev,
  45                                 struct sysdev_attribute *attr, char *buf)
  46 {
  47         return node_read_cpumap(dev, 1, buf);
  48 }
  49
  50 static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
  51 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
  52
  53 #define K(x) ((x) << (PAGE_SHIFT - 10))
  54 static ssize_t node_read_meminfo(struct sys_device * dev,
  55                         struct sysdev_attribute *attr, char * buf)
  56 {
  57         int n;
  58         int nid = dev->id;
  59         struct sysinfo i;
  60
  61         si_meminfo_node(&i, nid);
  62
  63         n = sprintf(buf, "\n"
  64                        "Node %d MemTotal:     %8lu kB\n"
  65                        "Node %d MemFree:      %8lu kB\n"
  66                        "Node %d MemUsed:      %8lu kB\n"
  67                        "Node %d Active:       %8lu kB\n"
  68                        "Node %d Inactive:     %8lu kB\n"
  69 #ifdef CONFIG_HIGHMEM
  70                        "Node %d HighTotal:    %8lu kB\n"
  71                        "Node %d HighFree:     %8lu kB\n"
  72                        "Node %d LowTotal:     %8lu kB\n"
  73                        "Node %d LowFree:      %8lu kB\n"
  74 #endif
  75                        "Node %d Dirty:        %8lu kB\n"
  76                        "Node %d Writeback:    %8lu kB\n"
  77                        "Node %d FilePages:    %8lu kB\n"
  78                        "Node %d Mapped:       %8lu kB\n"
  79                        "Node %d AnonPages:    %8lu kB\n"
  80                        "Node %d PageTables:   %8lu kB\n"
  81                        "Node %d NFS_Unstable: %8lu kB\n"
  82                        "Node %d Bounce:       %8lu kB\n"
  83                        "Node %d WritebackTmp: %8lu kB\n"
  84                        "Node %d Slab:         %8lu kB\n"
  85                        "Node %d SReclaimable: %8lu kB\n"
  86                        "Node %d SUnreclaim:   %8lu kB\n",
  87                        nid, K(i.totalram),
  88                        nid, K(i.freeram),
  89                        nid, K(i.totalram - i.freeram),
  90                        nid, K(node_page_state(nid, NR_ACTIVE)),
  91                        nid, K(node_page_state(nid, NR_INACTIVE)),
  92 #ifdef CONFIG_HIGHMEM
  93                        nid, K(i.totalhigh),
  94                        nid, K(i.freehigh),
  95                        nid, K(i.totalram - i.totalhigh),
  96                        nid, K(i.freeram - i.freehigh),
  97 #endif
  98                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
  99                        nid, K(node_page_state(nid, NR_WRITEBACK)),
 100                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
 101                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
 102                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
 103                        nid, K(node_page_state(nid, NR_PAGETABLE)),
 104                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
 105                        nid, K(node_page_state(nid, NR_BOUNCE)),
 106                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
 107                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
 108                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
 109                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
 110                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
 111         n += hugetlb_report_node_meminfo(nid, buf + n);
 112         return n;
 113 }
 114
 115 #undef K
 116 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
 117
 118 static ssize_t node_read_numastat(struct sys_device * dev,
 119                                 struct sysdev_attribute *attr, char * buf)
 120 {
 121         return sprintf(buf,
 122                        "numa_hit %lu\n"
 123                        "numa_miss %lu\n"
 124                        "numa_foreign %lu\n"
 125                        "interleave_hit %lu\n"
 126                        "local_node %lu\n"
 127                        "other_node %lu\n",
 128                        node_page_state(dev->id, NUMA_HIT),
 129                        node_page_state(dev->id, NUMA_MISS),
 130                        node_page_state(dev->id, NUMA_FOREIGN),
 131                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
 132                        node_page_state(dev->id, NUMA_LOCAL),
 133                        node_page_state(dev->id, NUMA_OTHER));
 134 }
 135 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 136
 137 static ssize_t node_read_distance(struct sys_device * dev,
 138                         struct sysdev_attribute *attr, char * buf)
 139 {
 140         int nid = dev->id;
 141         int len = 0;
 142         int i;
 143
 144         /* buf currently PAGE_SIZE, need ~4 chars per node */
 145         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 146
 147         for_each_online_node(i)
 148                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 149
 150         len += sprintf(buf + len, "\n");
 151         return len;
 152 }
 153 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 154
 155
 156 /*
 157  * register_node - Setup a sysfs device for a node.
 158  * @num - Node number to use when creating the device.
 159  *
 160  * Initialize and register the node device.
 161  */
 162 int register_node(struct node *node, int num, struct node *parent)
 163 {
 164         int error;
 165
 166         node->sysdev.id = num;
 167         node->sysdev.cls = &node_class;
 168         error = sysdev_register(&node->sysdev);
 169
 170         if (!error){
 171                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 172                 sysdev_create_file(&node->sysdev, &attr_cpulist);
 173                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 174                 sysdev_create_file(&node->sysdev, &attr_numastat);
 175                 sysdev_create_file(&node->sysdev, &attr_distance);
 176         }
 177         return error;
 178 }
 179
 180 /**
 181  * unregister_node - unregister a node device
 182  * @node: node going away
 183  *
 184  * Unregisters a node device @node.  All the devices on the node must be
 185  * unregistered before calling this function.
 186  */
 187 void unregister_node(struct node *node)
 188 {
 189         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 190         sysdev_remove_file(&node->sysdev, &attr_cpulist);
 191         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 192         sysdev_remove_file(&node->sysdev, &attr_numastat);
 193         sysdev_remove_file(&node->sysdev, &attr_distance);
 194
 195         sysdev_unregister(&node->sysdev);
 196 }
 197
 198 struct node node_devices[MAX_NUMNODES];
 199
 200 /*
 201  * register cpu under node
 202  */
 203 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 204 {
 205         if (node_online(nid)) {
 206                 struct sys_device *obj = get_cpu_sysdev(cpu);
 207                 if (!obj)
 208                         return 0;
 209                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 210                                          &obj->kobj,
 211                                          kobject_name(&obj->kobj));
 212          }
 213
 214         return 0;
 215 }
 216
 217 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 218 {
 219         if (node_online(nid)) {
 220                 struct sys_device *obj = get_cpu_sysdev(cpu);
 221                 if (obj)
 222                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 223                                          kobject_name(&obj->kobj));
 224         }
 225         return 0;
 226 }
 227
 228 int register_one_node(int nid)
 229 {
 230         int error = 0;
 231         int cpu;
 232
 233         if (node_online(nid)) {
 234                 int p_node = parent_node(nid);
 235                 struct node *parent = NULL;
 236
 237                 if (p_node != nid)
 238                         parent = &node_devices[p_node];
 239
 240                 error = register_node(&node_devices[nid], nid, parent);
 241
 242                 /* link cpu under this node */
 243                 for_each_present_cpu(cpu) {
 244                         if (cpu_to_node(cpu) == nid)
 245                                 register_cpu_under_node(cpu, nid);
 246                 }
 247         }
 248
 249         return error;
 250
 251 }
 252
 253 void unregister_one_node(int nid)
 254 {
 255         unregister_node(&node_devices[nid]);
 256 }
 257
 258 /*
 259  * node states attributes
 260  */
 261
 262 static ssize_t print_nodes_state(enum node_states state, char *buf)
 263 {
 264         int n;
 265
 266         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
 267         if (n > 0 && PAGE_SIZE > n + 1) {
 268                 *(buf + n++) = '\n';
 269                 *(buf + n++) = '\0';
 270         }
 271         return n;
 272 }
 273
 274 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
 275 {
 276         return print_nodes_state(N_POSSIBLE, buf);
 277 }
 278
 279 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
 280 {
 281         return print_nodes_state(N_ONLINE, buf);
 282 }
 283
 284 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
 285                                                 char *buf)
 286 {
 287         return print_nodes_state(N_NORMAL_MEMORY, buf);
 288 }
 289
 290 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
 291 {
 292         return print_nodes_state(N_CPU, buf);
 293 }
 294
 295 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
 296 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
 297 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
 298                                                                         NULL);
 299 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
 300
 301 #ifdef CONFIG_HIGHMEM
 302 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
 303                                                  char *buf)
 304 {
 305         return print_nodes_state(N_HIGH_MEMORY, buf);
 306 }
 307
 308 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
 309                                                                          NULL);
 310 #endif
 311
 312 struct sysdev_class_attribute *node_state_attr[] = {
 313         &attr_possible,
 314         &attr_online,
 315         &attr_has_normal_memory,
 316 #ifdef CONFIG_HIGHMEM
 317         &attr_has_high_memory,
 318 #endif
 319         &attr_has_cpu,
 320 };
 321
 322 static int node_states_init(void)
 323 {
 324         int i;
 325         int err = 0;
 326
 327         for (i = 0;  i < NR_NODE_STATES; i++) {
 328                 int ret;
 329                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
 330                 if (!err)
 331                         err = ret;
 332         }
 333         return err;
 334 }
 335
 336 static int __init register_node_type(void)
 337 {
 338         int ret;
 339
 340         ret = sysdev_class_register(&node_class);
 341         if (!ret)
 342                 ret = node_states_init();
 343
 344         /*
 345          * Note:  we're not going to unregister the node class if we fail
 346          * to register the node state class attribute files.
 347          */
 348         return ret;
 349 }
 350 postcore_initcall(register_node_type);