[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/memory.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);
	const struct cpumask *mask = cpumask_of_node(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"
		       "Node %d Unevictable:    %8lu kB\n"
		       "Node %d Mlocked:        %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)),
		       nid, K(node_page_state(nid, NR_UNEVICTABLE)),
		       nid, K(node_page_state(nid, NR_MLOCK)),
#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;
}

#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
#define page_initialized(page)  (page->lru.next)

static int get_nid_for_pfn(unsigned long pfn)
{
	struct page *page;

	if (!pfn_valid_within(pfn))
		return -1;
	page = pfn_to_page(pfn);
	if (!page_initialized(page))
		return -1;
	return pfn_to_nid(pfn);
}

/* register memory section under specified node if it spans that node */
int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
{
	unsigned long pfn, sect_start_pfn, sect_end_pfn;

	if (!mem_blk)
		return -EFAULT;
	if (!node_online(nid))
		return 0;
	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
		int page_nid;

		page_nid = get_nid_for_pfn(pfn);
		if (page_nid < 0)
			continue;
		if (page_nid != nid)
			continue;
		return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
					&mem_blk->sysdev.kobj,
					kobject_name(&mem_blk->sysdev.kobj));
	}
	/* mem section does not span the specified node */
	return 0;
}

/* unregister memory section under all nodes that it spans */
int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
{
	nodemask_t unlinked_nodes;
	unsigned long pfn, sect_start_pfn, sect_end_pfn;

	if (!mem_blk)
		return -EFAULT;
	nodes_clear(unlinked_nodes);
	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
		int nid;

		nid = get_nid_for_pfn(pfn);
		if (nid < 0)
			continue;
		if (!node_online(nid))
			continue;
		if (node_test_and_set(nid, unlinked_nodes))
			continue;
		sysfs_remove_link(&node_devices[nid].sysdev.kobj,
			 kobject_name(&mem_blk->sysdev.kobj));
	}
	return 0;
}

static int link_mem_sections(int nid)
{
	unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
	unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
	unsigned long pfn;
	int err = 0;

	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
		unsigned long section_nr = pfn_to_section_nr(pfn);
		struct mem_section *mem_sect;
		struct memory_block *mem_blk;
		int ret;

		if (!present_section_nr(section_nr))
			continue;
		mem_sect = __nr_to_section(section_nr);
		mem_blk = find_memory_block(mem_sect);
		ret = register_mem_sect_under_node(mem_blk, nid);
		if (!err)
			err = ret;

		/* discard ref obtained in find_memory_block() */
		kobject_put(&mem_blk->sysdev.kobj);
	}
	return err;
}
#else
static int link_mem_sections(int nid) { return 0; }
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */

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);
		}

		/* link memory sections under this node */
		error = link_mem_sections(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>
c04fc586	9	#include <linux/memory.h>
1da177e4 LT	10	#include <linux/node.h>
	11	#include <linux/hugetlb.h>
	12	#include <linux/cpumask.h>
	13	#include <linux/topology.h>
	14	#include <linux/nodemask.h>
76b67ed9	15	#include <linux/cpu.h>
bde631a5	16	#include <linux/device.h>
af936a16	17	#include <linux/swap.h>
1da177e4 LT	18
1da177e4 LT	19	static struct sysdev_class node_class = {
af5ca3f4	20	.name = "node",
1da177e4 LT	21	};
	22
	23
39106dcf	24	static ssize_t node_read_cpumap(struct sys_device dev, int type, char buf)
1da177e4 LT	25	{
1da177e4 LT	26	struct node *node_dev = to_node(dev);
a70f7302	27	const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
1da177e4 LT	28	int len;
1da177e4 LT	29
39106dcf MT	30	/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
39106dcf MT	31	BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
1da177e4	32
39106dcf	33	len = type?
29c0177e RR	34	cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
29c0177e RR	35	cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
c5f59f08 MT	36	buf[len++] = '\n';
c5f59f08 MT	37	buf[len] = '\0';
1da177e4 LT	38	return len;
	39	}
	40
4a0b2b4d AK	41	static inline ssize_t node_read_cpumask(struct sys_device *dev,
4a0b2b4d AK	42	struct sysdev_attribute attr, char buf)
39106dcf MT	43	{
	44	return node_read_cpumap(dev, 0, buf);
	45	}
4a0b2b4d AK	46	static inline ssize_t node_read_cpulist(struct sys_device *dev,
4a0b2b4d AK	47	struct sysdev_attribute attr, char buf)
39106dcf MT	48	{
	49	return node_read_cpumap(dev, 1, buf);
	50	}
	51
	52	static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
	53	static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
1da177e4 LT	54
1da177e4 LT	55	#define K(x) ((x) << (PAGE_SHIFT - 10))
4a0b2b4d AK	56	static ssize_t node_read_meminfo(struct sys_device * dev,
4a0b2b4d AK	57	struct sysdev_attribute attr, char buf)
1da177e4 LT	58	{
	59	int n;
	60	int nid = dev->id;
	61	struct sysinfo i;
1da177e4 LT	62
1da177e4 LT	63	si_meminfo_node(&i, nid);
c07e02db	64
1da177e4	65	n = sprintf(buf, "\n"
4f98a2fe RR	66	"Node %d MemTotal: %8lu kB\n"
	67	"Node %d MemFree: %8lu kB\n"
	68	"Node %d MemUsed: %8lu kB\n"
	69	"Node %d Active: %8lu kB\n"
	70	"Node %d Inactive: %8lu kB\n"
	71	"Node %d Active(anon): %8lu kB\n"
	72	"Node %d Inactive(anon): %8lu kB\n"
	73	"Node %d Active(file): %8lu kB\n"
	74	"Node %d Inactive(file): %8lu kB\n"
5344b7e6 NP	75	"Node %d Unevictable: %8lu kB\n"
5344b7e6 NP	76	"Node %d Mlocked: %8lu kB\n"
182e8e23	77	#ifdef CONFIG_HIGHMEM
4f98a2fe RR	78	"Node %d HighTotal: %8lu kB\n"
	79	"Node %d HighFree: %8lu kB\n"
	80	"Node %d LowTotal: %8lu kB\n"
	81	"Node %d LowFree: %8lu kB\n"
182e8e23	82	#endif
4f98a2fe RR	83	"Node %d Dirty: %8lu kB\n"
	84	"Node %d Writeback: %8lu kB\n"
	85	"Node %d FilePages: %8lu kB\n"
	86	"Node %d Mapped: %8lu kB\n"
	87	"Node %d AnonPages: %8lu kB\n"
	88	"Node %d PageTables: %8lu kB\n"
	89	"Node %d NFS_Unstable: %8lu kB\n"
	90	"Node %d Bounce: %8lu kB\n"
	91	"Node %d WritebackTmp: %8lu kB\n"
	92	"Node %d Slab: %8lu kB\n"
	93	"Node %d SReclaimable: %8lu kB\n"
	94	"Node %d SUnreclaim: %8lu kB\n",
1da177e4 LT	95	nid, K(i.totalram),
	96	nid, K(i.freeram),
	97	nid, K(i.totalram - i.freeram),
4f98a2fe RR	98	nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
	99	node_page_state(nid, NR_ACTIVE_FILE)),
	100	nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
	101	node_page_state(nid, NR_INACTIVE_FILE)),
	102	nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
	103	nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
	104	nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
	105	nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
7b854121	106	nid, K(node_page_state(nid, NR_UNEVICTABLE)),
5344b7e6	107	nid, K(node_page_state(nid, NR_MLOCK)),
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);
af936a16 LS	192
af936a16 LS	193	scan_unevictable_register_node(node);
1da177e4 LT	194	}
	195	return error;
	196	}
	197
4b45099b KT	198	/**
	199	* unregister_node - unregister a node device
	200	* @node: node going away
	201	*
	202	* Unregisters a node device @node. All the devices on the node must be
	203	* unregistered before calling this function.
	204	*/
	205	void unregister_node(struct node *node)
	206	{
	207	sysdev_remove_file(&node->sysdev, &attr_cpumap);
39106dcf	208	sysdev_remove_file(&node->sysdev, &attr_cpulist);
4b45099b KT	209	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	210	sysdev_remove_file(&node->sysdev, &attr_numastat);
	211	sysdev_remove_file(&node->sysdev, &attr_distance);
	212
af936a16 LS	213	scan_unevictable_unregister_node(node);
af936a16 LS	214
4b45099b KT	215	sysdev_unregister(&node->sysdev);
4b45099b KT	216	}
1da177e4	217
0fc44159 YG	218	struct node node_devices[MAX_NUMNODES];
0fc44159 YG	219
76b67ed9 KH	220	/*
	221	* register cpu under node
	222	*/
	223	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	224	{
	225	if (node_online(nid)) {
	226	struct sys_device *obj = get_cpu_sysdev(cpu);
	227	if (!obj)
	228	return 0;
	229	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
	230	&obj->kobj,
	231	kobject_name(&obj->kobj));
	232	}
	233
	234	return 0;
	235	}
	236
	237	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	238	{
	239	if (node_online(nid)) {
	240	struct sys_device *obj = get_cpu_sysdev(cpu);
	241	if (obj)
	242	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	243	kobject_name(&obj->kobj));
	244	}
	245	return 0;
	246	}
	247
c04fc586 GH	248	#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
	249	#define page_initialized(page) (page->lru.next)
	250
	251	static int get_nid_for_pfn(unsigned long pfn)
	252	{
	253	struct page *page;
	254
	255	if (!pfn_valid_within(pfn))
	256	return -1;
	257	page = pfn_to_page(pfn);
	258	if (!page_initialized(page))
	259	return -1;
	260	return pfn_to_nid(pfn);
	261	}
	262
	263	/* register memory section under specified node if it spans that node */
	264	int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
	265	{
	266	unsigned long pfn, sect_start_pfn, sect_end_pfn;
	267
	268	if (!mem_blk)
	269	return -EFAULT;
	270	if (!node_online(nid))
	271	return 0;
	272	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	273	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	274	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
	275	int page_nid;
	276
	277	page_nid = get_nid_for_pfn(pfn);
	278	if (page_nid < 0)
	279	continue;
	280	if (page_nid != nid)
	281	continue;
	282	return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
	283	&mem_blk->sysdev.kobj,
	284	kobject_name(&mem_blk->sysdev.kobj));
	285	}
	286	/* mem section does not span the specified node */
	287	return 0;
	288	}
	289
	290	/* unregister memory section under all nodes that it spans */
	291	int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
	292	{
	293	nodemask_t unlinked_nodes;
	294	unsigned long pfn, sect_start_pfn, sect_end_pfn;
	295
	296	if (!mem_blk)
	297	return -EFAULT;
	298	nodes_clear(unlinked_nodes);
	299	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
	300	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
	301	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
47504980	302	int nid;
c04fc586 GH	303
	304	nid = get_nid_for_pfn(pfn);
	305	if (nid < 0)
	306	continue;
	307	if (!node_online(nid))
	308	continue;
	309	if (node_test_and_set(nid, unlinked_nodes))
	310	continue;
	311	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	312	kobject_name(&mem_blk->sysdev.kobj));
	313	}
	314	return 0;
	315	}
	316
	317	static int link_mem_sections(int nid)
	318	{
	319	unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
	320	unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
	321	unsigned long pfn;
	322	int err = 0;
	323
	324	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
	325	unsigned long section_nr = pfn_to_section_nr(pfn);
	326	struct mem_section *mem_sect;
	327	struct memory_block *mem_blk;
	328	int ret;
	329
	330	if (!present_section_nr(section_nr))
	331	continue;
	332	mem_sect = __nr_to_section(section_nr);
	333	mem_blk = find_memory_block(mem_sect);
	334	ret = register_mem_sect_under_node(mem_blk, nid);
	335	if (!err)
	336	err = ret;
	337
	338	/* discard ref obtained in find_memory_block() */
	339	kobject_put(&mem_blk->sysdev.kobj);
	340	}
	341	return err;
	342	}
	343	#else
	344	static int link_mem_sections(int nid) { return 0; }
	345	#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
	346
0fc44159 YG	347	int register_one_node(int nid)
	348	{
	349	int error = 0;
76b67ed9	350	int cpu;
0fc44159 YG	351
	352	if (node_online(nid)) {
	353	int p_node = parent_node(nid);
	354	struct node *parent = NULL;
	355
	356	if (p_node != nid)
	357	parent = &node_devices[p_node];
	358
	359	error = register_node(&node_devices[nid], nid, parent);
76b67ed9 KH	360
	361	/* link cpu under this node */
	362	for_each_present_cpu(cpu) {
	363	if (cpu_to_node(cpu) == nid)
	364	register_cpu_under_node(cpu, nid);
	365	}
c04fc586 GH	366
	367	/* link memory sections under this node */
	368	error = link_mem_sections(nid);
0fc44159 YG	369	}
	370
	371	return error;
	372
	373	}
	374
	375	void unregister_one_node(int nid)
	376	{
	377	unregister_node(&node_devices[nid]);
	378	}
	379
bde631a5 LS	380	/*
	381	* node states attributes
	382	*/
	383
	384	static ssize_t print_nodes_state(enum node_states state, char *buf)
	385	{
	386	int n;
	387
	388	n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
	389	if (n > 0 && PAGE_SIZE > n + 1) {
	390	*(buf + n++) = '\n';
	391	*(buf + n++) = '\0';
	392	}
	393	return n;
	394	}
	395
	396	static ssize_t print_nodes_possible(struct sysdev_class class, char buf)
	397	{
	398	return print_nodes_state(N_POSSIBLE, buf);
	399	}
	400
	401	static ssize_t print_nodes_online(struct sysdev_class class, char buf)
	402	{
	403	return print_nodes_state(N_ONLINE, buf);
	404	}
	405
	406	static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
	407	char *buf)
	408	{
	409	return print_nodes_state(N_NORMAL_MEMORY, buf);
	410	}
	411
	412	static ssize_t print_nodes_has_cpu(struct sysdev_class class, char buf)
	413	{
	414	return print_nodes_state(N_CPU, buf);
	415	}
	416
	417	static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
	418	static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
	419	static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
	420	NULL);
	421	static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
	422
	423	#ifdef CONFIG_HIGHMEM
	424	static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
	425	char *buf)
	426	{
	427	return print_nodes_state(N_HIGH_MEMORY, buf);
	428	}
	429
	430	static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
	431	NULL);
	432	#endif
	433
	434	struct sysdev_class_attribute *node_state_attr[] = {
	435	&attr_possible,
	436	&attr_online,
	437	&attr_has_normal_memory,
	438	#ifdef CONFIG_HIGHMEM
	439	&attr_has_high_memory,
	440	#endif
	441	&attr_has_cpu,
	442	};
	443
444	static int node_states_init(void)
445	{
446	int i;
447	int err = 0;
448
449	for (i = 0; i < NR_NODE_STATES; i++) {
450	int ret;
451	ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
452	if (!err)
453	err = ret;
454	}
455	return err;
456	}
457
4b45099b	458	static int __init register_node_type(void)
1da177e4	459	{
bde631a5 LS	460	int ret;
	461
	462	ret = sysdev_class_register(&node_class);
	463	if (!ret)
	464	ret = node_states_init();
	465
	466	/*
	467	* Note: we're not going to unregister the node class if we fail
	468	* to register the node state class attribute files.
	469	*/
	470	return ret;
1da177e4 LT	471	}
1da177e4 LT	472	postcore_initcall(register_node_type);