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