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linux-sg2042/drivers/base/node.c

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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 = {
.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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