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node.c

/*
 * drivers/base/node.c - basic Node class support
 */

#include <linux/sysdev.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/node.h>
#include <linux/hugetlb.h>
#include <linux/cpumask.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
#include <linux/cpu.h>
#include <linux/device.h>

static struct sysdev_class node_class = {
      set_kset_name("node"),
};


static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
{
      struct node *node_dev = to_node(dev);
      cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
      int len;

      /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
      BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);

      len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
      len += sprintf(buf + len, "\n");
      return len;
}

static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);

#define K(x) ((x) << (PAGE_SHIFT - 10))
static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
{
      int n;
      int nid = dev->id;
      struct sysinfo i;

      si_meminfo_node(&i, nid);

      n = sprintf(buf, "\n"
                   "Node %d MemTotal:     %8lu kB\n"
                   "Node %d MemFree:      %8lu kB\n"
                   "Node %d MemUsed:      %8lu kB\n"
                   "Node %d Active:       %8lu kB\n"
                   "Node %d Inactive:     %8lu kB\n"
#ifdef CONFIG_HIGHMEM
                   "Node %d HighTotal:    %8lu kB\n"
                   "Node %d HighFree:     %8lu kB\n"
                   "Node %d LowTotal:     %8lu kB\n"
                   "Node %d LowFree:      %8lu kB\n"
#endif
                   "Node %d Dirty:        %8lu kB\n"
                   "Node %d Writeback:    %8lu kB\n"
                   "Node %d FilePages:    %8lu kB\n"
                   "Node %d Mapped:       %8lu kB\n"
                   "Node %d AnonPages:    %8lu kB\n"
                   "Node %d PageTables:   %8lu kB\n"
                   "Node %d NFS_Unstable: %8lu kB\n"
                   "Node %d Bounce:       %8lu kB\n"
                   "Node %d Slab:         %8lu kB\n"
                   "Node %d SReclaimable: %8lu kB\n"
                   "Node %d SUnreclaim:   %8lu kB\n",
                   nid, K(i.totalram),
                   nid, K(i.freeram),
                   nid, K(i.totalram - i.freeram),
                   nid, node_page_state(nid, NR_ACTIVE),
                   nid, node_page_state(nid, NR_INACTIVE),
#ifdef CONFIG_HIGHMEM
                   nid, K(i.totalhigh),
                   nid, K(i.freehigh),
                   nid, K(i.totalram - i.totalhigh),
                   nid, K(i.freeram - i.freehigh),
#endif
                   nid, K(node_page_state(nid, NR_FILE_DIRTY)),
                   nid, K(node_page_state(nid, NR_WRITEBACK)),
                   nid, K(node_page_state(nid, NR_FILE_PAGES)),
                   nid, K(node_page_state(nid, NR_FILE_MAPPED)),
                   nid, K(node_page_state(nid, NR_ANON_PAGES)),
                   nid, K(node_page_state(nid, NR_PAGETABLE)),
                   nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
                   nid, K(node_page_state(nid, NR_BOUNCE)),
                   nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
                        node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
                   nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
                   nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
      n += hugetlb_report_node_meminfo(nid, buf + n);
      return n;
}

#undef K
static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);

static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
{
      return sprintf(buf,
                   "numa_hit %lu\n"
                   "numa_miss %lu\n"
                   "numa_foreign %lu\n"
                   "interleave_hit %lu\n"
                   "local_node %lu\n"
                   "other_node %lu\n",
                   node_page_state(dev->id, NUMA_HIT),
                   node_page_state(dev->id, NUMA_MISS),
                   node_page_state(dev->id, NUMA_FOREIGN),
                   node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
                   node_page_state(dev->id, NUMA_LOCAL),
                   node_page_state(dev->id, NUMA_OTHER));
}
static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);

static ssize_t node_read_distance(struct sys_device * dev, char * buf)
{
      int nid = dev->id;
      int len = 0;
      int i;

      /* buf currently PAGE_SIZE, need ~4 chars per node */
      BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);

      for_each_online_node(i)
            len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));

      len += sprintf(buf + len, "\n");
      return len;
}
static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);


/*
 * register_node - Setup a sysfs device for a node.
 * @num - Node number to use when creating the device.
 *
 * Initialize and register the node device.
 */
int register_node(struct node *node, int num, struct node *parent)
{
      int error;

      node->sysdev.id = num;
      node->sysdev.cls = &node_class;
      error = sysdev_register(&node->sysdev);

      if (!error){
            sysdev_create_file(&node->sysdev, &attr_cpumap);
            sysdev_create_file(&node->sysdev, &attr_meminfo);
            sysdev_create_file(&node->sysdev, &attr_numastat);
            sysdev_create_file(&node->sysdev, &attr_distance);
      }
      return error;
}

/**
 * unregister_node - unregister a node device
 * @node: node going away
 *
 * Unregisters a node device @node.  All the devices on the node must be
 * unregistered before calling this function.
 */
void unregister_node(struct node *node)
{
      sysdev_remove_file(&node->sysdev, &attr_cpumap);
      sysdev_remove_file(&node->sysdev, &attr_meminfo);
      sysdev_remove_file(&node->sysdev, &attr_numastat);
      sysdev_remove_file(&node->sysdev, &attr_distance);

      sysdev_unregister(&node->sysdev);
}

struct node node_devices[MAX_NUMNODES];

/*
 * register cpu under node
 */
int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
      if (node_online(nid)) {
            struct sys_device *obj = get_cpu_sysdev(cpu);
            if (!obj)
                  return 0;
            return sysfs_create_link(&node_devices[nid].sysdev.kobj,
                               &obj->kobj,
                               kobject_name(&obj->kobj));
       }

      return 0;
}

int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
{
      if (node_online(nid)) {
            struct sys_device *obj = get_cpu_sysdev(cpu);
            if (obj)
                  sysfs_remove_link(&node_devices[nid].sysdev.kobj,
                               kobject_name(&obj->kobj));
      }
      return 0;
}

int register_one_node(int nid)
{
      int error = 0;
      int cpu;

      if (node_online(nid)) {
            int p_node = parent_node(nid);
            struct node *parent = NULL;

            if (p_node != nid)
                  parent = &node_devices[p_node];

            error = register_node(&node_devices[nid], nid, parent);

            /* link cpu under this node */
            for_each_present_cpu(cpu) {
                  if (cpu_to_node(cpu) == nid)
                        register_cpu_under_node(cpu, nid);
            }
      }

      return error;

}

void unregister_one_node(int nid)
{
      unregister_node(&node_devices[nid]);
}

/*
 * node states attributes
 */

static ssize_t print_nodes_state(enum node_states state, char *buf)
{
      int n;

      n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
      if (n > 0 && PAGE_SIZE > n + 1) {
            *(buf + n++) = '\n';
            *(buf + n++) = '\0';
      }
      return n;
}

static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
{
      return print_nodes_state(N_POSSIBLE, buf);
}

static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
{
      return print_nodes_state(N_ONLINE, buf);
}

static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
                                    char *buf)
{
      return print_nodes_state(N_NORMAL_MEMORY, buf);
}

static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
{
      return print_nodes_state(N_CPU, buf);
}

static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
                                                      NULL);
static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);

#ifdef CONFIG_HIGHMEM
static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
                                     char *buf)
{
      return print_nodes_state(N_HIGH_MEMORY, buf);
}

static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
                                                       NULL);
#endif

struct sysdev_class_attribute *node_state_attr[] = {
      &attr_possible,
      &attr_online,
      &attr_has_normal_memory,
#ifdef CONFIG_HIGHMEM
      &attr_has_high_memory,
#endif
      &attr_has_cpu,
};

static int node_states_init(void)
{
      int i;
      int err = 0;

      for (i = 0;  i < NR_NODE_STATES; i++) {
            int ret;
            ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
            if (!err)
                  err = ret;
      }
      return err;
}

static int __init register_node_type(void)
{
      int ret;

      ret = sysdev_class_register(&node_class);
      if (!ret)
            ret = node_states_init();

      /*
       * Note:  we're not going to unregister the node class if we fail
       * to register the node state class attribute files.
       */
      return ret;
}
postcore_initcall(register_node_type);

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