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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, 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         /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
  29         BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
  30
  31         len = cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
  32         buf[len++] = '\n';
  33         buf[len] = '\0';
  34         return len;
  35 }
  36
  37 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
  38
  39 #define K(x) ((x) << (PAGE_SHIFT - 10))
  40 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
  41 {
  42         int n;
  43         int nid = dev->id;
  44         struct sysinfo i;
  45
  46         si_meminfo_node(&i, nid);
  47
  48         n = sprintf(buf, "\n"
  49                        "Node %d MemTotal:     %8lu kB\n"
  50                        "Node %d MemFree:      %8lu kB\n"
  51                        "Node %d MemUsed:      %8lu kB\n"
  52                        "Node %d Active:       %8lu kB\n"
  53                        "Node %d Inactive:     %8lu kB\n"
  54 #ifdef CONFIG_HIGHMEM
  55                        "Node %d HighTotal:    %8lu kB\n"
  56                        "Node %d HighFree:     %8lu kB\n"
  57                        "Node %d LowTotal:     %8lu kB\n"
  58                        "Node %d LowFree:      %8lu kB\n"
  59 #endif
  60                        "Node %d Dirty:        %8lu kB\n"
  61                        "Node %d Writeback:    %8lu kB\n"
  62                        "Node %d FilePages:    %8lu kB\n"
  63                        "Node %d Mapped:       %8lu kB\n"
  64                        "Node %d AnonPages:    %8lu kB\n"
  65                        "Node %d PageTables:   %8lu kB\n"
  66                        "Node %d NFS_Unstable: %8lu kB\n"
  67                        "Node %d Bounce:       %8lu kB\n"
  68                        "Node %d Slab:         %8lu kB\n"
  69                        "Node %d SReclaimable: %8lu kB\n"
  70                        "Node %d SUnreclaim:   %8lu kB\n",
  71                        nid, K(i.totalram),
  72                        nid, K(i.freeram),
  73                        nid, K(i.totalram - i.freeram),
  74                        nid, node_page_state(nid, NR_ACTIVE),
  75                        nid, node_page_state(nid, NR_INACTIVE),
  76 #ifdef CONFIG_HIGHMEM
  77                        nid, K(i.totalhigh),
  78                        nid, K(i.freehigh),
  79                        nid, K(i.totalram - i.totalhigh),
  80                        nid, K(i.freeram - i.freehigh),
  81 #endif
  82                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
  83                        nid, K(node_page_state(nid, NR_WRITEBACK)),
  84                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
  85                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
  86                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
  87                        nid, K(node_page_state(nid, NR_PAGETABLE)),
  88                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
  89                        nid, K(node_page_state(nid, NR_BOUNCE)),
  90                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
  91                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
  92                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
  93                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
  94         n += hugetlb_report_node_meminfo(nid, buf + n);
  95         return n;
  96 }
  97
  98 #undef K
  99 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
 100
 101 static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
 102 {
 103         return sprintf(buf,
 104                        "numa_hit %lu\n"
 105                        "numa_miss %lu\n"
 106                        "numa_foreign %lu\n"
 107                        "interleave_hit %lu\n"
 108                        "local_node %lu\n"
 109                        "other_node %lu\n",
 110                        node_page_state(dev->id, NUMA_HIT),
 111                        node_page_state(dev->id, NUMA_MISS),
 112                        node_page_state(dev->id, NUMA_FOREIGN),
 113                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
 114                        node_page_state(dev->id, NUMA_LOCAL),
 115                        node_page_state(dev->id, NUMA_OTHER));
 116 }
 117 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 118
 119 static ssize_t node_read_distance(struct sys_device * dev, char * buf)
 120 {
 121         int nid = dev->id;
 122         int len = 0;
 123         int i;
 124
 125         /* buf currently PAGE_SIZE, need ~4 chars per node */
 126         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 127
 128         for_each_online_node(i)
 129                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 130
 131         len += sprintf(buf + len, "\n");
 132         return len;
 133 }
 134 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 135
 136
 137 /*
 138  * register_node - Setup a sysfs device for a node.
 139  * @num - Node number to use when creating the device.
 140  *
 141  * Initialize and register the node device.
 142  */
 143 int register_node(struct node *node, int num, struct node *parent)
 144 {
 145         int error;
 146
 147         node->sysdev.id = num;
 148         node->sysdev.cls = &node_class;
 149         error = sysdev_register(&node->sysdev);
 150
 151         if (!error){
 152                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 153                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 154                 sysdev_create_file(&node->sysdev, &attr_numastat);
 155                 sysdev_create_file(&node->sysdev, &attr_distance);
 156         }
 157         return error;
 158 }
 159
 160 /**
 161  * unregister_node - unregister a node device
 162  * @node: node going away
 163  *
 164  * Unregisters a node device @node.  All the devices on the node must be
 165  * unregistered before calling this function.
 166  */
 167 void unregister_node(struct node *node)
 168 {
 169         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 170         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 171         sysdev_remove_file(&node->sysdev, &attr_numastat);
 172         sysdev_remove_file(&node->sysdev, &attr_distance);
 173
 174         sysdev_unregister(&node->sysdev);
 175 }
 176
 177 struct node node_devices[MAX_NUMNODES];
 178
 179 /*
 180  * register cpu under node
 181  */
 182 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 183 {
 184         if (node_online(nid)) {
 185                 struct sys_device *obj = get_cpu_sysdev(cpu);
 186                 if (!obj)
 187                         return 0;
 188                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 189                                          &obj->kobj,
 190                                          kobject_name(&obj->kobj));
 191          }
 192
 193         return 0;
 194 }
 195
 196 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 197 {
 198         if (node_online(nid)) {
 199                 struct sys_device *obj = get_cpu_sysdev(cpu);
 200                 if (obj)
 201                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 202                                          kobject_name(&obj->kobj));
 203         }
 204         return 0;
 205 }
 206
 207 int register_one_node(int nid)
 208 {
 209         int error = 0;
 210         int cpu;
 211
 212         if (node_online(nid)) {
 213                 int p_node = parent_node(nid);
 214                 struct node *parent = NULL;
 215
 216                 if (p_node != nid)
 217                         parent = &node_devices[p_node];
 218
 219                 error = register_node(&node_devices[nid], nid, parent);
 220
 221                 /* link cpu under this node */
 222                 for_each_present_cpu(cpu) {
 223                         if (cpu_to_node(cpu) == nid)
 224                                 register_cpu_under_node(cpu, nid);
 225                 }
 226         }
 227
 228         return error;
 229
 230 }
 231
 232 void unregister_one_node(int nid)
 233 {
 234         unregister_node(&node_devices[nid]);
 235 }
 236
 237 /*
 238  * node states attributes
 239  */
 240
 241 static ssize_t print_nodes_state(enum node_states state, char *buf)
 242 {
 243         int n;
 244
 245         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
 246         if (n > 0 && PAGE_SIZE > n + 1) {
 247                 *(buf + n++) = '\n';
 248                 *(buf + n++) = '\0';
 249         }
 250         return n;
 251 }
 252
 253 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
 254 {
 255         return print_nodes_state(N_POSSIBLE, buf);
 256 }
 257
 258 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
 259 {
 260         return print_nodes_state(N_ONLINE, buf);
 261 }
 262
 263 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
 264                                                 char *buf)
 265 {
 266         return print_nodes_state(N_NORMAL_MEMORY, buf);
 267 }
 268
 269 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
 270 {
 271         return print_nodes_state(N_CPU, buf);
 272 }
 273
 274 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
 275 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
 276 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
 277                                                                         NULL);
 278 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
 279
 280 #ifdef CONFIG_HIGHMEM
 281 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
 282                                                  char *buf)
 283 {
 284         return print_nodes_state(N_HIGH_MEMORY, buf);
 285 }
 286
 287 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
 288                                                                          NULL);
 289 #endif
 290
 291 struct sysdev_class_attribute *node_state_attr[] = {
 292         &attr_possible,
 293         &attr_online,
 294         &attr_has_normal_memory,
 295 #ifdef CONFIG_HIGHMEM
 296         &attr_has_high_memory,
 297 #endif
 298         &attr_has_cpu,
 299 };
 300
 301 static int node_states_init(void)
 302 {
 303         int i;
 304         int err = 0;
 305
 306         for (i = 0;  i < NR_NODE_STATES; i++) {
 307                 int ret;
 308                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
 309                 if (!err)
 310                         err = ret;
 311         }
 312         return err;
 313 }
 314
 315 static int __init register_node_type(void)
 316 {
 317         int ret;
 318
 319         ret = sysdev_class_register(&node_class);
 320         if (!ret)
 321                 ret = node_states_init();
 322
 323         /*
 324          * Note:  we're not going to unregister the node class if we fail
 325          * to register the node state class attribute files.
 326          */
 327         return ret;
 328 }
 329 postcore_initcall(register_node_type);