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