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 #include <linux/swap.h>
  17
  18 static struct sysdev_class node_class = {
  19         .name = "node",
  20 };
  21
  22
  23 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
  24 {
  25         struct node *node_dev = to_node(dev);
  26         node_to_cpumask_ptr(mask, node_dev->sysdev.id);
  27         int len;
  28
  29         /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
  30         BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
  31
  32         len = type?
  33                 cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
  34                 cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
  35         buf[len++] = '\n';
  36         buf[len] = '\0';
  37         return len;
  38 }
  39
  40 static inline ssize_t node_read_cpumask(struct sys_device *dev,
  41                                 struct sysdev_attribute *attr, char *buf)
  42 {
  43         return node_read_cpumap(dev, 0, buf);
  44 }
  45 static inline ssize_t node_read_cpulist(struct sys_device *dev,
  46                                 struct sysdev_attribute *attr, char *buf)
  47 {
  48         return node_read_cpumap(dev, 1, buf);
  49 }
  50
  51 static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
  52 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
  53
  54 #define K(x) ((x) << (PAGE_SHIFT - 10))
  55 static ssize_t node_read_meminfo(struct sys_device * dev,
  56                         struct sysdev_attribute *attr, char * buf)
  57 {
  58         int n;
  59         int nid = dev->id;
  60         struct sysinfo i;
  61
  62         si_meminfo_node(&i, nid);
  63
  64         n = sprintf(buf, "\n"
  65                        "Node %d MemTotal:       %8lu kB\n"
  66                        "Node %d MemFree:        %8lu kB\n"
  67                        "Node %d MemUsed:        %8lu kB\n"
  68                        "Node %d Active:         %8lu kB\n"
  69                        "Node %d Inactive:       %8lu kB\n"
  70                        "Node %d Active(anon):   %8lu kB\n"
  71                        "Node %d Inactive(anon): %8lu kB\n"
  72                        "Node %d Active(file):   %8lu kB\n"
  73                        "Node %d Inactive(file): %8lu kB\n"
  74 #ifdef CONFIG_UNEVICTABLE_LRU
  75                        "Node %d Unevictable:    %8lu kB\n"
  76                        "Node %d Mlocked:        %8lu kB\n"
  77 #endif
  78 #ifdef CONFIG_HIGHMEM
  79                        "Node %d HighTotal:      %8lu kB\n"
  80                        "Node %d HighFree:       %8lu kB\n"
  81                        "Node %d LowTotal:       %8lu kB\n"
  82                        "Node %d LowFree:        %8lu kB\n"
  83 #endif
  84                        "Node %d Dirty:          %8lu kB\n"
  85                        "Node %d Writeback:      %8lu kB\n"
  86                        "Node %d FilePages:      %8lu kB\n"
  87                        "Node %d Mapped:         %8lu kB\n"
  88                        "Node %d AnonPages:      %8lu kB\n"
  89                        "Node %d PageTables:     %8lu kB\n"
  90                        "Node %d NFS_Unstable:   %8lu kB\n"
  91                        "Node %d Bounce:         %8lu kB\n"
  92                        "Node %d WritebackTmp:   %8lu kB\n"
  93                        "Node %d Slab:           %8lu kB\n"
  94                        "Node %d SReclaimable:   %8lu kB\n"
  95                        "Node %d SUnreclaim:     %8lu kB\n",
  96                        nid, K(i.totalram),
  97                        nid, K(i.freeram),
  98                        nid, K(i.totalram - i.freeram),
  99                        nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
 100                                 node_page_state(nid, NR_ACTIVE_FILE)),
 101                        nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
 102                                 node_page_state(nid, NR_INACTIVE_FILE)),
 103                        nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
 104                        nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
 105                        nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
 106                        nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
 107 #ifdef CONFIG_UNEVICTABLE_LRU
 108                        nid, K(node_page_state(nid, NR_UNEVICTABLE)),
 109                        nid, K(node_page_state(nid, NR_MLOCK)),
 110 #endif
 111 #ifdef CONFIG_HIGHMEM
 112                        nid, K(i.totalhigh),
 113                        nid, K(i.freehigh),
 114                        nid, K(i.totalram - i.totalhigh),
 115                        nid, K(i.freeram - i.freehigh),
 116 #endif
 117                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
 118                        nid, K(node_page_state(nid, NR_WRITEBACK)),
 119                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
 120                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
 121                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
 122                        nid, K(node_page_state(nid, NR_PAGETABLE)),
 123                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
 124                        nid, K(node_page_state(nid, NR_BOUNCE)),
 125                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
 126                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
 127                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
 128                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
 129                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
 130         n += hugetlb_report_node_meminfo(nid, buf + n);
 131         return n;
 132 }
 133
 134 #undef K
 135 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
 136
 137 static ssize_t node_read_numastat(struct sys_device * dev,
 138                                 struct sysdev_attribute *attr, char * buf)
 139 {
 140         return sprintf(buf,
 141                        "numa_hit %lu\n"
 142                        "numa_miss %lu\n"
 143                        "numa_foreign %lu\n"
 144                        "interleave_hit %lu\n"
 145                        "local_node %lu\n"
 146                        "other_node %lu\n",
 147                        node_page_state(dev->id, NUMA_HIT),
 148                        node_page_state(dev->id, NUMA_MISS),
 149                        node_page_state(dev->id, NUMA_FOREIGN),
 150                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
 151                        node_page_state(dev->id, NUMA_LOCAL),
 152                        node_page_state(dev->id, NUMA_OTHER));
 153 }
 154 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 155
 156 static ssize_t node_read_distance(struct sys_device * dev,
 157                         struct sysdev_attribute *attr, char * buf)
 158 {
 159         int nid = dev->id;
 160         int len = 0;
 161         int i;
 162
 163         /* buf currently PAGE_SIZE, need ~4 chars per node */
 164         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 165
 166         for_each_online_node(i)
 167                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 168
 169         len += sprintf(buf + len, "\n");
 170         return len;
 171 }
 172 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 173
 174
 175 /*
 176  * register_node - Setup a sysfs device for a node.
 177  * @num - Node number to use when creating the device.
 178  *
 179  * Initialize and register the node device.
 180  */
 181 int register_node(struct node *node, int num, struct node *parent)
 182 {
 183         int error;
 184
 185         node->sysdev.id = num;
 186         node->sysdev.cls = &node_class;
 187         error = sysdev_register(&node->sysdev);
 188
 189         if (!error){
 190                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 191                 sysdev_create_file(&node->sysdev, &attr_cpulist);
 192                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 193                 sysdev_create_file(&node->sysdev, &attr_numastat);
 194                 sysdev_create_file(&node->sysdev, &attr_distance);
 195
 196                 scan_unevictable_register_node(node);
 197         }
 198         return error;
 199 }
 200
 201 /**
 202  * unregister_node - unregister a node device
 203  * @node: node going away
 204  *
 205  * Unregisters a node device @node.  All the devices on the node must be
 206  * unregistered before calling this function.
 207  */
 208 void unregister_node(struct node *node)
 209 {
 210         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 211         sysdev_remove_file(&node->sysdev, &attr_cpulist);
 212         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 213         sysdev_remove_file(&node->sysdev, &attr_numastat);
 214         sysdev_remove_file(&node->sysdev, &attr_distance);
 215
 216         scan_unevictable_unregister_node(node);
 217
 218         sysdev_unregister(&node->sysdev);
 219 }
 220
 221 struct node node_devices[MAX_NUMNODES];
 222
 223 /*
 224  * register cpu under node
 225  */
 226 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 227 {
 228         if (node_online(nid)) {
 229                 struct sys_device *obj = get_cpu_sysdev(cpu);
 230                 if (!obj)
 231                         return 0;
 232                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 233                                          &obj->kobj,
 234                                          kobject_name(&obj->kobj));
 235          }
 236
 237         return 0;
 238 }
 239
 240 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 241 {
 242         if (node_online(nid)) {
 243                 struct sys_device *obj = get_cpu_sysdev(cpu);
 244                 if (obj)
 245                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 246                                          kobject_name(&obj->kobj));
 247         }
 248         return 0;
 249 }
 250
 251 int register_one_node(int nid)
 252 {
 253         int error = 0;
 254         int cpu;
 255
 256         if (node_online(nid)) {
 257                 int p_node = parent_node(nid);
 258                 struct node *parent = NULL;
 259
 260                 if (p_node != nid)
 261                         parent = &node_devices[p_node];
 262
 263                 error = register_node(&node_devices[nid], nid, parent);
 264
 265                 /* link cpu under this node */
 266                 for_each_present_cpu(cpu) {
 267                         if (cpu_to_node(cpu) == nid)
 268                                 register_cpu_under_node(cpu, nid);
 269                 }
 270         }
 271
 272         return error;
 273
 274 }
 275
 276 void unregister_one_node(int nid)
 277 {
 278         unregister_node(&node_devices[nid]);
 279 }
 280
 281 /*
 282  * node states attributes
 283  */
 284
 285 static ssize_t print_nodes_state(enum node_states state, char *buf)
 286 {
 287         int n;
 288
 289         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
 290         if (n > 0 && PAGE_SIZE > n + 1) {
 291                 *(buf + n++) = '\n';
 292                 *(buf + n++) = '\0';
 293         }
 294         return n;
 295 }
 296
 297 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
 298 {
 299         return print_nodes_state(N_POSSIBLE, buf);
 300 }
 301
 302 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
 303 {
 304         return print_nodes_state(N_ONLINE, buf);
 305 }
 306
 307 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
 308                                                 char *buf)
 309 {
 310         return print_nodes_state(N_NORMAL_MEMORY, buf);
 311 }
 312
 313 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
 314 {
 315         return print_nodes_state(N_CPU, buf);
 316 }
 317
 318 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
 319 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
 320 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
 321                                                                         NULL);
 322 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
 323
 324 #ifdef CONFIG_HIGHMEM
 325 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
 326                                                  char *buf)
 327 {
 328         return print_nodes_state(N_HIGH_MEMORY, buf);
 329 }
 330
 331 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
 332                                                                          NULL);
 333 #endif
 334
 335 struct sysdev_class_attribute *node_state_attr[] = {
 336         &attr_possible,
 337         &attr_online,
 338         &attr_has_normal_memory,
 339 #ifdef CONFIG_HIGHMEM
 340         &attr_has_high_memory,
 341 #endif
 342         &attr_has_cpu,
 343 };
 344
 345 static int node_states_init(void)
 346 {
 347         int i;
 348         int err = 0;
 349
 350         for (i = 0;  i < NR_NODE_STATES; i++) {
 351                 int ret;
 352                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
 353                 if (!err)
 354                         err = ret;
 355         }
 356         return err;
 357 }
 358
 359 static int __init register_node_type(void)
 360 {
 361         int ret;
 362
 363         ret = sysdev_class_register(&node_class);
 364         if (!ret)
 365                 ret = node_states_init();
 366
 367         /*
 368          * Note:  we're not going to unregister the node class if we fail
 369          * to register the node state class attribute files.
 370          */
 371         return ret;
 372 }
 373 postcore_initcall(register_node_type);