[deliverable/linux.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>
#include <linux/swap.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 Unevictable:    %8lu kB\n"
		       "Node %d Mlocked:        %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)),
		       nid, K(node_page_state(nid, NR_MLOCK)),
#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);

		scan_unevictable_register_node(node);
	}
	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);

	scan_unevictable_unregister_node(node);

	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>
af936a16	16	#include <linux/swap.h>
1da177e4 LT	17
1da177e4 LT	18	static struct sysdev_class node_class = {
af5ca3f4	19	.name = "node",
1da177e4 LT	20	};
	21
	22
39106dcf	23	static ssize_t node_read_cpumap(struct sys_device dev, int type, char buf)
1da177e4 LT	24	{
1da177e4 LT	25	struct node *node_dev = to_node(dev);
c5f59f08	26	node_to_cpumask_ptr(mask, node_dev->sysdev.id);
1da177e4 LT	27	int len;
1da177e4 LT	28
39106dcf MT	29	/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
39106dcf MT	30	BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
1da177e4	31
39106dcf MT	32	len = type?
	33	cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
	34	cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
c5f59f08 MT	35	buf[len++] = '\n';
c5f59f08 MT	36	buf[len] = '\0';
1da177e4 LT	37	return len;
	38	}
	39
4a0b2b4d AK	40	static inline ssize_t node_read_cpumask(struct sys_device *dev,
4a0b2b4d AK	41	struct sysdev_attribute attr, char buf)
39106dcf MT	42	{
	43	return node_read_cpumap(dev, 0, buf);
	44	}
4a0b2b4d AK	45	static inline ssize_t node_read_cpulist(struct sys_device *dev,
4a0b2b4d AK	46	struct sysdev_attribute attr, char buf)
39106dcf MT	47	{
	48	return node_read_cpumap(dev, 1, buf);
	49	}
	50
	51	static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
	52	static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
1da177e4 LT	53
1da177e4 LT	54	#define K(x) ((x) << (PAGE_SHIFT - 10))
4a0b2b4d AK	55	static ssize_t node_read_meminfo(struct sys_device * dev,
4a0b2b4d AK	56	struct sysdev_attribute attr, char buf)
1da177e4 LT	57	{
	58	int n;
	59	int nid = dev->id;
	60	struct sysinfo i;
1da177e4 LT	61
1da177e4 LT	62	si_meminfo_node(&i, nid);
c07e02db	63
1da177e4	64	n = sprintf(buf, "\n"
4f98a2fe RR	65	"Node %d MemTotal: %8lu kB\n"
	66	"Node %d MemFree: %8lu kB\n"
	67	"Node %d MemUsed: %8lu kB\n"
	68	"Node %d Active: %8lu kB\n"
	69	"Node %d Inactive: %8lu kB\n"
	70	"Node %d Active(anon): %8lu kB\n"
	71	"Node %d Inactive(anon): %8lu kB\n"
	72	"Node %d Active(file): %8lu kB\n"
	73	"Node %d Inactive(file): %8lu kB\n"
7b854121	74	#ifdef CONFIG_UNEVICTABLE_LRU
5344b7e6 NP	75	"Node %d Unevictable: %8lu kB\n"
5344b7e6 NP	76	"Node %d Mlocked: %8lu kB\n"
7b854121	77	#endif
182e8e23	78	#ifdef CONFIG_HIGHMEM
4f98a2fe RR	79	"Node %d HighTotal: %8lu kB\n"
	80	"Node %d HighFree: %8lu kB\n"
	81	"Node %d LowTotal: %8lu kB\n"
	82	"Node %d LowFree: %8lu kB\n"
182e8e23	83	#endif
4f98a2fe RR	84	"Node %d Dirty: %8lu kB\n"
	85	"Node %d Writeback: %8lu kB\n"
	86	"Node %d FilePages: %8lu kB\n"
	87	"Node %d Mapped: %8lu kB\n"
	88	"Node %d AnonPages: %8lu kB\n"
	89	"Node %d PageTables: %8lu kB\n"
	90	"Node %d NFS_Unstable: %8lu kB\n"
	91	"Node %d Bounce: %8lu kB\n"
	92	"Node %d WritebackTmp: %8lu kB\n"
	93	"Node %d Slab: %8lu kB\n"
	94	"Node %d SReclaimable: %8lu kB\n"
	95	"Node %d SUnreclaim: %8lu kB\n",
1da177e4 LT	96	nid, K(i.totalram),
	97	nid, K(i.freeram),
	98	nid, K(i.totalram - i.freeram),
4f98a2fe RR	99	nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
	100	node_page_state(nid, NR_ACTIVE_FILE)),
	101	nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
	102	node_page_state(nid, NR_INACTIVE_FILE)),
	103	nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
	104	nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
	105	nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
	106	nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
7b854121 LS	107	#ifdef CONFIG_UNEVICTABLE_LRU
7b854121 LS	108	nid, K(node_page_state(nid, NR_UNEVICTABLE)),
5344b7e6	109	nid, K(node_page_state(nid, NR_MLOCK)),
7b854121	110	#endif
182e8e23	111	#ifdef CONFIG_HIGHMEM
1da177e4 LT	112	nid, K(i.totalhigh),
	113	nid, K(i.freehigh),
	114	nid, K(i.totalram - i.totalhigh),
c07e02db	115	nid, K(i.freeram - i.freehigh),
182e8e23	116	#endif
b1e7a8fd	117	nid, K(node_page_state(nid, NR_FILE_DIRTY)),
ce866b34	118	nid, K(node_page_state(nid, NR_WRITEBACK)),
347ce434	119	nid, K(node_page_state(nid, NR_FILE_PAGES)),
65ba55f5	120	nid, K(node_page_state(nid, NR_FILE_MAPPED)),
f3dbd344	121	nid, K(node_page_state(nid, NR_ANON_PAGES)),
df849a15	122	nid, K(node_page_state(nid, NR_PAGETABLE)),
fd39fc85	123	nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
d2c5e30c	124	nid, K(node_page_state(nid, NR_BOUNCE)),
fc3ba692	125	nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
972d1a7b CL	126	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
	127	node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
	128	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
	129	nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
1da177e4 LT	130	n += hugetlb_report_node_meminfo(nid, buf + n);
	131	return n;
	132	}
	133
	134	#undef K
	135	static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
	136
4a0b2b4d AK	137	static ssize_t node_read_numastat(struct sys_device * dev,
4a0b2b4d AK	138	struct sysdev_attribute attr, char buf)
1da177e4	139	{
1da177e4 LT	140	return sprintf(buf,
	141	"numa_hit %lu\n"
	142	"numa_miss %lu\n"
	143	"numa_foreign %lu\n"
	144	"interleave_hit %lu\n"
	145	"local_node %lu\n"
	146	"other_node %lu\n",
ca889e6c CL	147	node_page_state(dev->id, NUMA_HIT),
	148	node_page_state(dev->id, NUMA_MISS),
	149	node_page_state(dev->id, NUMA_FOREIGN),
	150	node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
	151	node_page_state(dev->id, NUMA_LOCAL),
	152	node_page_state(dev->id, NUMA_OTHER));
1da177e4 LT	153	}
	154	static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
	155
4a0b2b4d AK	156	static ssize_t node_read_distance(struct sys_device * dev,
4a0b2b4d AK	157	struct sysdev_attribute attr, char buf)
1da177e4 LT	158	{
	159	int nid = dev->id;
	160	int len = 0;
	161	int i;
	162
	163	/* buf currently PAGE_SIZE, need ~4 chars per node */
	164	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
	165
	166	for_each_online_node(i)
	167	len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
	168
	169	len += sprintf(buf + len, "\n");
	170	return len;
	171	}
	172	static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
	173
	174
	175	/*
405ae7d3	176	* register_node - Setup a sysfs device for a node.
1da177e4 LT	177	* @num - Node number to use when creating the device.
	178	*
	179	* Initialize and register the node device.
	180	*/
4b45099b	181	int register_node(struct node node, int num, struct node parent)
1da177e4 LT	182	{
	183	int error;
	184
	185	node->sysdev.id = num;
	186	node->sysdev.cls = &node_class;
	187	error = sysdev_register(&node->sysdev);
	188
	189	if (!error){
	190	sysdev_create_file(&node->sysdev, &attr_cpumap);
39106dcf	191	sysdev_create_file(&node->sysdev, &attr_cpulist);
1da177e4 LT	192	sysdev_create_file(&node->sysdev, &attr_meminfo);
	193	sysdev_create_file(&node->sysdev, &attr_numastat);
	194	sysdev_create_file(&node->sysdev, &attr_distance);
af936a16 LS	195
af936a16 LS	196	scan_unevictable_register_node(node);
1da177e4 LT	197	}
	198	return error;
	199	}
	200
4b45099b KT	201	/**
	202	* unregister_node - unregister a node device
	203	* @node: node going away
	204	*
	205	* Unregisters a node device @node. All the devices on the node must be
	206	* unregistered before calling this function.
	207	*/
	208	void unregister_node(struct node *node)
	209	{
	210	sysdev_remove_file(&node->sysdev, &attr_cpumap);
39106dcf	211	sysdev_remove_file(&node->sysdev, &attr_cpulist);
4b45099b KT	212	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	213	sysdev_remove_file(&node->sysdev, &attr_numastat);
	214	sysdev_remove_file(&node->sysdev, &attr_distance);
	215
af936a16 LS	216	scan_unevictable_unregister_node(node);
af936a16 LS	217
4b45099b KT	218	sysdev_unregister(&node->sysdev);
4b45099b KT	219	}
1da177e4	220
0fc44159 YG	221	struct node node_devices[MAX_NUMNODES];
0fc44159 YG	222
76b67ed9 KH	223	/*
	224	* register cpu under node
	225	*/
	226	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	227	{
	228	if (node_online(nid)) {
	229	struct sys_device *obj = get_cpu_sysdev(cpu);
	230	if (!obj)
	231	return 0;
	232	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
	233	&obj->kobj,
	234	kobject_name(&obj->kobj));
	235	}
	236
	237	return 0;
	238	}
	239
	240	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	241	{
	242	if (node_online(nid)) {
	243	struct sys_device *obj = get_cpu_sysdev(cpu);
	244	if (obj)
	245	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	246	kobject_name(&obj->kobj));
	247	}
	248	return 0;
	249	}
	250
0fc44159 YG	251	int register_one_node(int nid)
	252	{
	253	int error = 0;
76b67ed9	254	int cpu;
0fc44159 YG	255
	256	if (node_online(nid)) {
	257	int p_node = parent_node(nid);
	258	struct node *parent = NULL;
	259
	260	if (p_node != nid)
	261	parent = &node_devices[p_node];
	262
	263	error = register_node(&node_devices[nid], nid, parent);
76b67ed9 KH	264
	265	/* link cpu under this node */
	266	for_each_present_cpu(cpu) {
	267	if (cpu_to_node(cpu) == nid)
	268	register_cpu_under_node(cpu, nid);
	269	}
0fc44159 YG	270	}
	271
	272	return error;
	273
	274	}
	275
	276	void unregister_one_node(int nid)
	277	{
	278	unregister_node(&node_devices[nid]);
	279	}
	280
bde631a5 LS	281	/*
	282	* node states attributes
	283	*/
	284
	285	static ssize_t print_nodes_state(enum node_states state, char *buf)
	286	{
	287	int n;
	288
	289	n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
	290	if (n > 0 && PAGE_SIZE > n + 1) {
	291	*(buf + n++) = '\n';
	292	*(buf + n++) = '\0';
	293	}
	294	return n;
	295	}
	296
	297	static ssize_t print_nodes_possible(struct sysdev_class class, char buf)
	298	{
	299	return print_nodes_state(N_POSSIBLE, buf);
	300	}
	301
	302	static ssize_t print_nodes_online(struct sysdev_class class, char buf)
	303	{
	304	return print_nodes_state(N_ONLINE, buf);
	305	}
	306
	307	static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
	308	char *buf)
	309	{
	310	return print_nodes_state(N_NORMAL_MEMORY, buf);
	311	}
	312
	313	static ssize_t print_nodes_has_cpu(struct sysdev_class class, char buf)
	314	{
	315	return print_nodes_state(N_CPU, buf);
	316	}
	317
	318	static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
	319	static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
	320	static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
	321	NULL);
	322	static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
	323
	324	#ifdef CONFIG_HIGHMEM
	325	static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
	326	char *buf)
	327	{
	328	return print_nodes_state(N_HIGH_MEMORY, buf);
	329	}
	330
	331	static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
	332	NULL);
	333	#endif
	334
	335	struct sysdev_class_attribute *node_state_attr[] = {
	336	&attr_possible,
	337	&attr_online,
	338	&attr_has_normal_memory,
	339	#ifdef CONFIG_HIGHMEM
	340	&attr_has_high_memory,
	341	#endif
	342	&attr_has_cpu,
	343	};
	344
345	static int node_states_init(void)
346	{
347	int i;
348	int err = 0;
349
350	for (i = 0; i < NR_NODE_STATES; i++) {
351	int ret;
352	ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
353	if (!err)
354	err = ret;
355	}
356	return err;
357	}
358
4b45099b	359	static int __init register_node_type(void)
1da177e4	360	{
bde631a5 LS	361	int ret;
	362
	363	ret = sysdev_class_register(&node_class);
	364	if (!ret)
	365	ret = node_states_init();
	366
	367	/*
	368	* Note: we're not going to unregister the node class if we fail
	369	* to register the node state class attribute files.
	370	*/
	371	return ret;
1da177e4 LT	372	}
1da177e4 LT	373	postcore_initcall(register_node_type);