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