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