[linux-2.6-block.git] / drivers / base / 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 = {
	.name = "node",
};


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

	/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
	BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));

	len = type?
		cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
		cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
 	buf[len++] = '\n';
 	buf[len] = '\0';
	return len;
}

static inline ssize_t node_read_cpumask(struct sys_device *dev,
				struct sysdev_attribute *attr, char *buf)
{
	return node_read_cpumap(dev, 0, buf);
}
static inline ssize_t node_read_cpulist(struct sys_device *dev,
				struct sysdev_attribute *attr, char *buf)
{
	return node_read_cpumap(dev, 1, buf);
}

static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);

#define K(x) ((x) << (PAGE_SHIFT - 10))
static ssize_t node_read_meminfo(struct sys_device * dev,
			struct sysdev_attribute *attr, 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"
		       "Node %d Active(anon):   %8lu kB\n"
		       "Node %d Inactive(anon): %8lu kB\n"
		       "Node %d Active(file):   %8lu kB\n"
		       "Node %d Inactive(file): %8lu kB\n"
#ifdef CONFIG_UNEVICTABLE_LRU
		       "Node %d Noreclaim:      %8lu kB\n"
#endif
#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 WritebackTmp:   %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, K(node_page_state(nid, NR_ACTIVE_ANON) +
				node_page_state(nid, NR_ACTIVE_FILE)),
		       nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
				node_page_state(nid, NR_INACTIVE_FILE)),
		       nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
		       nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
		       nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
		       nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
#ifdef CONFIG_UNEVICTABLE_LRU
		       nid, K(node_page_state(nid, NR_UNEVICTABLE)),
#endif
#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_WRITEBACK_TEMP)),
		       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,
				struct sysdev_attribute *attr, 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,
			struct sysdev_attribute *attr, 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_cpulist);
		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_cpulist);
	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);
Commit	Line	Data
1da177e4 LT	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>
76b67ed9	14	#include <linux/cpu.h>
bde631a5	15	#include <linux/device.h>
1da177e4 LT	16
1da177e4 LT	17	static struct sysdev_class node_class = {
af5ca3f4	18	.name = "node",
1da177e4 LT	19	};
	20
	21
39106dcf	22	static ssize_t node_read_cpumap(struct sys_device dev, int type, char buf)
1da177e4 LT	23	{
1da177e4 LT	24	struct node *node_dev = to_node(dev);
c5f59f08	25	node_to_cpumask_ptr(mask, node_dev->sysdev.id);
1da177e4 LT	26	int len;
1da177e4 LT	27
39106dcf MT	28	/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
39106dcf MT	29	BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
1da177e4	30
39106dcf MT	31	len = type?
	32	cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
	33	cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
c5f59f08 MT	34	buf[len++] = '\n';
c5f59f08 MT	35	buf[len] = '\0';
1da177e4 LT	36	return len;
	37	}
	38
4a0b2b4d AK	39	static inline ssize_t node_read_cpumask(struct sys_device *dev,
4a0b2b4d AK	40	struct sysdev_attribute attr, char buf)
39106dcf MT	41	{
	42	return node_read_cpumap(dev, 0, buf);
	43	}
4a0b2b4d AK	44	static inline ssize_t node_read_cpulist(struct sys_device *dev,
4a0b2b4d AK	45	struct sysdev_attribute attr, char buf)
39106dcf MT	46	{
	47	return node_read_cpumap(dev, 1, buf);
	48	}
	49
	50	static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
	51	static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
1da177e4 LT	52
1da177e4 LT	53	#define K(x) ((x) << (PAGE_SHIFT - 10))
4a0b2b4d AK	54	static ssize_t node_read_meminfo(struct sys_device * dev,
4a0b2b4d AK	55	struct sysdev_attribute attr, char buf)
1da177e4 LT	56	{
	57	int n;
	58	int nid = dev->id;
	59	struct sysinfo i;
1da177e4 LT	60
1da177e4 LT	61	si_meminfo_node(&i, nid);
c07e02db	62
1da177e4	63	n = sprintf(buf, "\n"
4f98a2fe RR	64	"Node %d MemTotal: %8lu kB\n"
	65	"Node %d MemFree: %8lu kB\n"
	66	"Node %d MemUsed: %8lu kB\n"
	67	"Node %d Active: %8lu kB\n"
	68	"Node %d Inactive: %8lu kB\n"
	69	"Node %d Active(anon): %8lu kB\n"
	70	"Node %d Inactive(anon): %8lu kB\n"
	71	"Node %d Active(file): %8lu kB\n"
	72	"Node %d Inactive(file): %8lu kB\n"
7b854121 LS	73	#ifdef CONFIG_UNEVICTABLE_LRU
	74	"Node %d Noreclaim: %8lu kB\n"
	75	#endif
182e8e23	76	#ifdef CONFIG_HIGHMEM
4f98a2fe RR	77	"Node %d HighTotal: %8lu kB\n"
	78	"Node %d HighFree: %8lu kB\n"
	79	"Node %d LowTotal: %8lu kB\n"
	80	"Node %d LowFree: %8lu kB\n"
182e8e23	81	#endif
4f98a2fe RR	82	"Node %d Dirty: %8lu kB\n"
	83	"Node %d Writeback: %8lu kB\n"
	84	"Node %d FilePages: %8lu kB\n"
	85	"Node %d Mapped: %8lu kB\n"
	86	"Node %d AnonPages: %8lu kB\n"
	87	"Node %d PageTables: %8lu kB\n"
	88	"Node %d NFS_Unstable: %8lu kB\n"
	89	"Node %d Bounce: %8lu kB\n"
	90	"Node %d WritebackTmp: %8lu kB\n"
	91	"Node %d Slab: %8lu kB\n"
	92	"Node %d SReclaimable: %8lu kB\n"
	93	"Node %d SUnreclaim: %8lu kB\n",
1da177e4 LT	94	nid, K(i.totalram),
	95	nid, K(i.freeram),
	96	nid, K(i.totalram - i.freeram),
4f98a2fe RR	97	nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
	98	node_page_state(nid, NR_ACTIVE_FILE)),
	99	nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
	100	node_page_state(nid, NR_INACTIVE_FILE)),
	101	nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
	102	nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
	103	nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
	104	nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
7b854121 LS	105	#ifdef CONFIG_UNEVICTABLE_LRU
	106	nid, K(node_page_state(nid, NR_UNEVICTABLE)),
	107	#endif
182e8e23	108	#ifdef CONFIG_HIGHMEM
1da177e4 LT	109	nid, K(i.totalhigh),
	110	nid, K(i.freehigh),
	111	nid, K(i.totalram - i.totalhigh),
c07e02db	112	nid, K(i.freeram - i.freehigh),
182e8e23	113	#endif
b1e7a8fd	114	nid, K(node_page_state(nid, NR_FILE_DIRTY)),
ce866b34	115	nid, K(node_page_state(nid, NR_WRITEBACK)),
347ce434	116	nid, K(node_page_state(nid, NR_FILE_PAGES)),
65ba55f5	117	nid, K(node_page_state(nid, NR_FILE_MAPPED)),
f3dbd344	118	nid, K(node_page_state(nid, NR_ANON_PAGES)),
df849a15	119	nid, K(node_page_state(nid, NR_PAGETABLE)),
fd39fc85	120	nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
d2c5e30c	121	nid, K(node_page_state(nid, NR_BOUNCE)),
fc3ba692	122	nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
972d1a7b CL	123	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
	124	node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
	125	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
	126	nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
1da177e4 LT	127	n += hugetlb_report_node_meminfo(nid, buf + n);
	128	return n;
	129	}
	130
	131	#undef K
	132	static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
	133
4a0b2b4d AK	134	static ssize_t node_read_numastat(struct sys_device * dev,
4a0b2b4d AK	135	struct sysdev_attribute attr, char buf)
1da177e4	136	{
1da177e4 LT	137	return sprintf(buf,
	138	"numa_hit %lu\n"
	139	"numa_miss %lu\n"
	140	"numa_foreign %lu\n"
	141	"interleave_hit %lu\n"
	142	"local_node %lu\n"
	143	"other_node %lu\n",
ca889e6c CL	144	node_page_state(dev->id, NUMA_HIT),
	145	node_page_state(dev->id, NUMA_MISS),
	146	node_page_state(dev->id, NUMA_FOREIGN),
	147	node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
	148	node_page_state(dev->id, NUMA_LOCAL),
	149	node_page_state(dev->id, NUMA_OTHER));
1da177e4 LT	150	}
	151	static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
	152
4a0b2b4d AK	153	static ssize_t node_read_distance(struct sys_device * dev,
4a0b2b4d AK	154	struct sysdev_attribute attr, char buf)
1da177e4 LT	155	{
	156	int nid = dev->id;
	157	int len = 0;
	158	int i;
	159
	160	/* buf currently PAGE_SIZE, need ~4 chars per node */
	161	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
	162
	163	for_each_online_node(i)
	164	len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
	165
	166	len += sprintf(buf + len, "\n");
	167	return len;
	168	}
	169	static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
	170
	171
	172	/*
405ae7d3	173	* register_node - Setup a sysfs device for a node.
1da177e4 LT	174	* @num - Node number to use when creating the device.
	175	*
	176	* Initialize and register the node device.
	177	*/
4b45099b	178	int register_node(struct node node, int num, struct node parent)
1da177e4 LT	179	{
	180	int error;
	181
	182	node->sysdev.id = num;
	183	node->sysdev.cls = &node_class;
	184	error = sysdev_register(&node->sysdev);
	185
	186	if (!error){
	187	sysdev_create_file(&node->sysdev, &attr_cpumap);
39106dcf	188	sysdev_create_file(&node->sysdev, &attr_cpulist);
1da177e4 LT	189	sysdev_create_file(&node->sysdev, &attr_meminfo);
	190	sysdev_create_file(&node->sysdev, &attr_numastat);
	191	sysdev_create_file(&node->sysdev, &attr_distance);
	192	}
	193	return error;
	194	}
	195
4b45099b KT	196	/**
	197	* unregister_node - unregister a node device
	198	* @node: node going away
	199	*
	200	* Unregisters a node device @node. All the devices on the node must be
	201	* unregistered before calling this function.
	202	*/
	203	void unregister_node(struct node *node)
	204	{
	205	sysdev_remove_file(&node->sysdev, &attr_cpumap);
39106dcf	206	sysdev_remove_file(&node->sysdev, &attr_cpulist);
4b45099b KT	207	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	208	sysdev_remove_file(&node->sysdev, &attr_numastat);
	209	sysdev_remove_file(&node->sysdev, &attr_distance);
	210
	211	sysdev_unregister(&node->sysdev);
	212	}
1da177e4	213
0fc44159 YG	214	struct node node_devices[MAX_NUMNODES];
0fc44159 YG	215
76b67ed9 KH	216	/*
	217	* register cpu under node
	218	*/
	219	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	220	{
	221	if (node_online(nid)) {
	222	struct sys_device *obj = get_cpu_sysdev(cpu);
	223	if (!obj)
	224	return 0;
	225	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
	226	&obj->kobj,
	227	kobject_name(&obj->kobj));
	228	}
	229
	230	return 0;
	231	}
	232
	233	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	234	{
	235	if (node_online(nid)) {
	236	struct sys_device *obj = get_cpu_sysdev(cpu);
	237	if (obj)
	238	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	239	kobject_name(&obj->kobj));
	240	}
	241	return 0;
	242	}
	243
0fc44159 YG	244	int register_one_node(int nid)
	245	{
	246	int error = 0;
76b67ed9	247	int cpu;
0fc44159 YG	248
	249	if (node_online(nid)) {
	250	int p_node = parent_node(nid);
	251	struct node *parent = NULL;
	252
	253	if (p_node != nid)
	254	parent = &node_devices[p_node];
	255
	256	error = register_node(&node_devices[nid], nid, parent);
76b67ed9 KH	257
	258	/* link cpu under this node */
	259	for_each_present_cpu(cpu) {
	260	if (cpu_to_node(cpu) == nid)
	261	register_cpu_under_node(cpu, nid);
	262	}
0fc44159 YG	263	}
	264
	265	return error;
	266
	267	}
	268
	269	void unregister_one_node(int nid)
	270	{
	271	unregister_node(&node_devices[nid]);
	272	}
	273
bde631a5 LS	274	/*
	275	* node states attributes
	276	*/
	277
	278	static ssize_t print_nodes_state(enum node_states state, char *buf)
	279	{
	280	int n;
	281
	282	n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
	283	if (n > 0 && PAGE_SIZE > n + 1) {
	284	*(buf + n++) = '\n';
	285	*(buf + n++) = '\0';
	286	}
	287	return n;
	288	}
	289
	290	static ssize_t print_nodes_possible(struct sysdev_class class, char buf)
	291	{
	292	return print_nodes_state(N_POSSIBLE, buf);
	293	}
	294
	295	static ssize_t print_nodes_online(struct sysdev_class class, char buf)
	296	{
	297	return print_nodes_state(N_ONLINE, buf);
	298	}
	299
	300	static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
	301	char *buf)
	302	{
	303	return print_nodes_state(N_NORMAL_MEMORY, buf);
	304	}
	305
	306	static ssize_t print_nodes_has_cpu(struct sysdev_class class, char buf)
	307	{
	308	return print_nodes_state(N_CPU, buf);
	309	}
	310
	311	static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
	312	static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
	313	static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
	314	NULL);
	315	static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
	316
	317	#ifdef CONFIG_HIGHMEM
	318	static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
	319	char *buf)
	320	{
	321	return print_nodes_state(N_HIGH_MEMORY, buf);
	322	}
	323
	324	static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
	325	NULL);
	326	#endif
	327
	328	struct sysdev_class_attribute *node_state_attr[] = {
	329	&attr_possible,
	330	&attr_online,
	331	&attr_has_normal_memory,
	332	#ifdef CONFIG_HIGHMEM
	333	&attr_has_high_memory,
	334	#endif
	335	&attr_has_cpu,
	336	};
	337
338	static int node_states_init(void)
339	{
340	int i;
341	int err = 0;
342
343	for (i = 0; i < NR_NODE_STATES; i++) {
344	int ret;
345	ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
346	if (!err)
347	err = ret;
348	}
349	return err;
350	}
351
4b45099b	352	static int __init register_node_type(void)
1da177e4	353	{
bde631a5 LS	354	int ret;
	355
	356	ret = sysdev_class_register(&node_class);
	357	if (!ret)
	358	ret = node_states_init();
	359
	360	/*
	361	* Note: we're not going to unregister the node class if we fail
	362	* to register the node state class attribute files.
	363	*/
	364	return ret;
1da177e4 LT	365	}
1da177e4 LT	366	postcore_initcall(register_node_type);