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/*

 * 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);