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   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                        "Node %d Active(anon):   %8lu kB\n"
  70                        "Node %d Inactive(anon): %8lu kB\n"
  71                        "Node %d Active(file):   %8lu kB\n"
  72                        "Node %d Inactive(file): %8lu kB\n"
  73 #ifdef CONFIG_UNEVICTABLE_LRU
  74                        "Node %d Unevictable:    %8lu kB\n"
  75                        "Node %d Mlocked:        %8lu kB\n"
  76 #endif
  77 #ifdef CONFIG_HIGHMEM
  78                        "Node %d HighTotal:      %8lu kB\n"
  79                        "Node %d HighFree:       %8lu kB\n"
  80                        "Node %d LowTotal:       %8lu kB\n"
  81                        "Node %d LowFree:        %8lu kB\n"
  82 #endif
  83                        "Node %d Dirty:          %8lu kB\n"
  84                        "Node %d Writeback:      %8lu kB\n"
  85                        "Node %d FilePages:      %8lu kB\n"
  86                        "Node %d Mapped:         %8lu kB\n"
  87                        "Node %d AnonPages:      %8lu kB\n"
  88                        "Node %d PageTables:     %8lu kB\n"
  89                        "Node %d NFS_Unstable:   %8lu kB\n"
  90                        "Node %d Bounce:         %8lu kB\n"
  91                        "Node %d WritebackTmp:   %8lu kB\n"
  92                        "Node %d Slab:           %8lu kB\n"
  93                        "Node %d SReclaimable:   %8lu kB\n"
  94                        "Node %d SUnreclaim:     %8lu kB\n",
  95                        nid, K(i.totalram),
  96                        nid, K(i.freeram),
  97                        nid, K(i.totalram - i.freeram),
  98                        nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
  99                                 node_page_state(nid, NR_ACTIVE_FILE)),
 100                        nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
 101                                 node_page_state(nid, NR_INACTIVE_FILE)),
 102                        nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
 103                        nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
 104                        nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
 105                        nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
 106 #ifdef CONFIG_UNEVICTABLE_LRU
 107                        nid, K(node_page_state(nid, NR_UNEVICTABLE)),
 108                        nid, K(node_page_state(nid, NR_MLOCK)),
 109 #endif
 110 #ifdef CONFIG_HIGHMEM
 111                        nid, K(i.totalhigh),
 112                        nid, K(i.freehigh),
 113                        nid, K(i.totalram - i.totalhigh),
 114                        nid, K(i.freeram - i.freehigh),
 115 #endif
 116                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
 117                        nid, K(node_page_state(nid, NR_WRITEBACK)),
 118                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
 119                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
 120                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
 121                        nid, K(node_page_state(nid, NR_PAGETABLE)),
 122                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
 123                        nid, K(node_page_state(nid, NR_BOUNCE)),
 124                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
 125                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
 126                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
 127                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
 128                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
 129         n += hugetlb_report_node_meminfo(nid, buf + n);
 130         return n;
 131 }
 132
 133 #undef K
 134 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
 135
 136 static ssize_t node_read_numastat(struct sys_device * dev,
 137                                 struct sysdev_attribute *attr, char * buf)
 138 {
 139         return sprintf(buf,
 140                        "numa_hit %lu\n"
 141                        "numa_miss %lu\n"
 142                        "numa_foreign %lu\n"
 143                        "interleave_hit %lu\n"
 144                        "local_node %lu\n"
 145                        "other_node %lu\n",
 146                        node_page_state(dev->id, NUMA_HIT),
 147                        node_page_state(dev->id, NUMA_MISS),
 148                        node_page_state(dev->id, NUMA_FOREIGN),
 149                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
 150                        node_page_state(dev->id, NUMA_LOCAL),
 151                        node_page_state(dev->id, NUMA_OTHER));
 152 }
 153 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 154
 155 static ssize_t node_read_distance(struct sys_device * dev,
 156                         struct sysdev_attribute *attr, char * buf)
 157 {
 158         int nid = dev->id;
 159         int len = 0;
 160         int i;
 161
 162         /* buf currently PAGE_SIZE, need ~4 chars per node */
 163         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 164
 165         for_each_online_node(i)
 166                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 167
 168         len += sprintf(buf + len, "\n");
 169         return len;
 170 }
 171 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 172
 173
 174 /*
 175  * register_node - Setup a sysfs device for a node.
 176  * @num - Node number to use when creating the device.
 177  *
 178  * Initialize and register the node device.
 179  */
 180 int register_node(struct node *node, int num, struct node *parent)
 181 {
 182         int error;
 183
 184         node->sysdev.id = num;
 185         node->sysdev.cls = &node_class;
 186         error = sysdev_register(&node->sysdev);
 187
 188         if (!error){
 189                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 190                 sysdev_create_file(&node->sysdev, &attr_cpulist);
 191                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 192                 sysdev_create_file(&node->sysdev, &attr_numastat);
 193                 sysdev_create_file(&node->sysdev, &attr_distance);
 194         }
 195         return error;
 196 }
 197
 198 /**
 199  * unregister_node - unregister a node device
 200  * @node: node going away
 201  *
 202  * Unregisters a node device @node.  All the devices on the node must be
 203  * unregistered before calling this function.
 204  */
 205 void unregister_node(struct node *node)
 206 {
 207         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 208         sysdev_remove_file(&node->sysdev, &attr_cpulist);
 209         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 210         sysdev_remove_file(&node->sysdev, &attr_numastat);
 211         sysdev_remove_file(&node->sysdev, &attr_distance);
 212
 213         sysdev_unregister(&node->sysdev);
 214 }
 215
 216 struct node node_devices[MAX_NUMNODES];
 217
 218 /*
 219  * register cpu under node
 220  */
 221 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 222 {
 223         if (node_online(nid)) {
 224                 struct sys_device *obj = get_cpu_sysdev(cpu);
 225                 if (!obj)
 226                         return 0;
 227                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 228                                          &obj->kobj,
 229                                          kobject_name(&obj->kobj));
 230          }
 231
 232         return 0;
 233 }
 234
 235 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 236 {
 237         if (node_online(nid)) {
 238                 struct sys_device *obj = get_cpu_sysdev(cpu);
 239                 if (obj)
 240                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 241                                          kobject_name(&obj->kobj));
 242         }
 243         return 0;
 244 }
 245
 246 int register_one_node(int nid)
 247 {
 248         int error = 0;
 249         int cpu;
 250
 251         if (node_online(nid)) {
 252                 int p_node = parent_node(nid);
 253                 struct node *parent = NULL;
 254
 255                 if (p_node != nid)
 256                         parent = &node_devices[p_node];
 257
 258                 error = register_node(&node_devices[nid], nid, parent);
 259
 260                 /* link cpu under this node */
 261                 for_each_present_cpu(cpu) {
 262                         if (cpu_to_node(cpu) == nid)
 263                                 register_cpu_under_node(cpu, nid);
 264                 }
 265         }
 266
 267         return error;
 268
 269 }
 270
 271 void unregister_one_node(int nid)
 272 {
 273         unregister_node(&node_devices[nid]);
 274 }
 275
 276 /*
 277  * node states attributes
 278  */
 279
 280 static ssize_t print_nodes_state(enum node_states state, char *buf)
 281 {
 282         int n;
 283
 284         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
 285         if (n > 0 && PAGE_SIZE > n + 1) {
 286                 *(buf + n++) = '\n';
 287                 *(buf + n++) = '\0';
 288         }
 289         return n;
 290 }
 291
 292 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
 293 {
 294         return print_nodes_state(N_POSSIBLE, buf);
 295 }
 296
 297 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
 298 {
 299         return print_nodes_state(N_ONLINE, buf);
 300 }
 301
 302 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
 303                                                 char *buf)
 304 {
 305         return print_nodes_state(N_NORMAL_MEMORY, buf);
 306 }
 307
 308 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
 309 {
 310         return print_nodes_state(N_CPU, buf);
 311 }
 312
 313 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
 314 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
 315 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
 316                                                                         NULL);
 317 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
 318
 319 #ifdef CONFIG_HIGHMEM
 320 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
 321                                                  char *buf)
 322 {
 323         return print_nodes_state(N_HIGH_MEMORY, buf);
 324 }
 325
 326 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
 327                                                                          NULL);
 328 #endif
 329
 330 struct sysdev_class_attribute *node_state_attr[] = {
 331         &attr_possible,
 332         &attr_online,
 333         &attr_has_normal_memory,
 334 #ifdef CONFIG_HIGHMEM
 335         &attr_has_high_memory,
 336 #endif
 337         &attr_has_cpu,
 338 };
 339
 340 static int node_states_init(void)
 341 {
 342         int i;
 343         int err = 0;
 344
 345         for (i = 0;  i < NR_NODE_STATES; i++) {
 346                 int ret;
 347                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
 348                 if (!err)
 349                         err = ret;
 350         }
 351         return err;
 352 }
 353
 354 static int __init register_node_type(void)
 355 {
 356         int ret;
 357
 358         ret = sysdev_class_register(&node_class);
 359         if (!ret)
 360                 ret = node_states_init();
 361
 362         /*
 363          * Note:  we're not going to unregister the node class if we fail
 364          * to register the node state class attribute files.
 365          */
 366         return ret;
 367 }
 368 postcore_initcall(register_node_type);