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