[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>

static struct sysdev_class node_class = {
	set_kset_name("node"),
};


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

	/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
	BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);

	len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
	len += sprintf(buf + len, "\n");
	return len;
}

static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);

#define K(x) ((x) << (PAGE_SHIFT - 10))
static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
{
	int n;
	int nid = dev->id;
	struct sysinfo i;
	struct page_state ps;
	unsigned long inactive;
	unsigned long active;
	unsigned long free;

	si_meminfo_node(&i, nid);
	get_page_state_node(&ps, nid);
	__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));

	/* Check for negative values in these approximate counters */
	if ((long)ps.nr_dirty < 0)
		ps.nr_dirty = 0;
	if ((long)ps.nr_writeback < 0)
		ps.nr_writeback = 0;
	if ((long)ps.nr_slab < 0)
		ps.nr_slab = 0;

	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 HighTotal:    %8lu kB\n"
		       "Node %d HighFree:     %8lu kB\n"
		       "Node %d LowTotal:     %8lu kB\n"
		       "Node %d LowFree:      %8lu kB\n"
		       "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 Slab:         %8lu kB\n",
		       nid, K(i.totalram),
		       nid, K(i.freeram),
		       nid, K(i.totalram - i.freeram),
		       nid, K(active),
		       nid, K(inactive),
		       nid, K(i.totalhigh),
		       nid, K(i.freehigh),
		       nid, K(i.totalram - i.totalhigh),
		       nid, K(i.freeram - i.freehigh),
		       nid, K(ps.nr_dirty),
		       nid, K(ps.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(ps.nr_slab));
	n += hugetlb_report_node_meminfo(nid, buf + n);
	return n;
}

#undef K
static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);

static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
{
	unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
	unsigned long local_node, other_node;
	int i, cpu;
	pg_data_t *pg = NODE_DATA(dev->id);
	numa_hit = 0;
	numa_miss = 0;
	interleave_hit = 0;
	numa_foreign = 0;
	local_node = 0;
	other_node = 0;
	for (i = 0; i < MAX_NR_ZONES; i++) {
		struct zone *z = &pg->node_zones[i];
		for_each_online_cpu(cpu) {
			struct per_cpu_pageset *ps = zone_pcp(z,cpu);
			numa_hit += ps->numa_hit;
			numa_miss += ps->numa_miss;
			numa_foreign += ps->numa_foreign;
			interleave_hit += ps->interleave_hit;
			local_node += ps->local_node;
			other_node += ps->other_node;
		}
	}
	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",
		       numa_hit,
		       numa_miss,
		       numa_foreign,
		       interleave_hit,
		       local_node,
		       other_node);
}
static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);

static ssize_t node_read_distance(struct sys_device * dev, char * buf)
{
	int nid = dev->id;
	int len = 0;
	int i;

	/* buf currently PAGE_SIZE, need ~4 chars per node */
	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);

	for_each_online_node(i)
		len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));

	len += sprintf(buf + len, "\n");
	return len;
}
static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);


/*
 * register_node - Setup a driverfs device for a node.
 * @num - Node number to use when creating the device.
 *
 * Initialize and register the node device.
 */
int register_node(struct node *node, int num, struct node *parent)
{
	int error;

	node->sysdev.id = num;
	node->sysdev.cls = &node_class;
	error = sysdev_register(&node->sysdev);

	if (!error){
		sysdev_create_file(&node->sysdev, &attr_cpumap);
		sysdev_create_file(&node->sysdev, &attr_meminfo);
		sysdev_create_file(&node->sysdev, &attr_numastat);
		sysdev_create_file(&node->sysdev, &attr_distance);
	}
	return error;
}

/**
 * unregister_node - unregister a node device
 * @node: node going away
 *
 * Unregisters a node device @node.  All the devices on the node must be
 * unregistered before calling this function.
 */
void unregister_node(struct node *node)
{
	sysdev_remove_file(&node->sysdev, &attr_cpumap);
	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	sysdev_remove_file(&node->sysdev, &attr_numastat);
	sysdev_remove_file(&node->sysdev, &attr_distance);

	sysdev_unregister(&node->sysdev);
}

struct node node_devices[MAX_NUMNODES];

/*
 * register cpu under node
 */
int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	if (node_online(nid)) {
		struct sys_device *obj = get_cpu_sysdev(cpu);
		if (!obj)
			return 0;
		return sysfs_create_link(&node_devices[nid].sysdev.kobj,
					 &obj->kobj,
					 kobject_name(&obj->kobj));
	 }

	return 0;
}

int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	if (node_online(nid)) {
		struct sys_device *obj = get_cpu_sysdev(cpu);
		if (obj)
			sysfs_remove_link(&node_devices[nid].sysdev.kobj,
					 kobject_name(&obj->kobj));
	}
	return 0;
}

int register_one_node(int nid)
{
	int error = 0;
	int cpu;

	if (node_online(nid)) {
		int p_node = parent_node(nid);
		struct node *parent = NULL;

		if (p_node != nid)
			parent = &node_devices[p_node];

		error = register_node(&node_devices[nid], nid, parent);

		/* link cpu under this node */
		for_each_present_cpu(cpu) {
			if (cpu_to_node(cpu) == nid)
				register_cpu_under_node(cpu, nid);
		}
	}

	return error;

}

void unregister_one_node(int nid)
{
	unregister_node(&node_devices[nid]);
}

static int __init register_node_type(void)
{
	return sysdev_class_register(&node_class);
}
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>
1da177e4 LT	15
	16	static struct sysdev_class node_class = {
	17	set_kset_name("node"),
	18	};
	19
	20
	21	static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
	22	{
	23	struct node *node_dev = to_node(dev);
	24	cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
	25	int len;
	26
	27	/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
	28	BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
	29
	30	len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
	31	len += sprintf(buf + len, "\n");
	32	return len;
	33	}
	34
	35	static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
	36
	37	#define K(x) ((x) << (PAGE_SHIFT - 10))
	38	static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
	39	{
	40	int n;
	41	int nid = dev->id;
	42	struct sysinfo i;
c07e02db	43	struct page_state ps;
1da177e4 LT	44	unsigned long inactive;
	45	unsigned long active;
	46	unsigned long free;
	47
	48	si_meminfo_node(&i, nid);
c07e02db	49	get_page_state_node(&ps, nid);
1da177e4 LT	50	__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
1da177e4 LT	51
c07e02db MH	52	/* Check for negative values in these approximate counters */
	53	if ((long)ps.nr_dirty < 0)
	54	ps.nr_dirty = 0;
	55	if ((long)ps.nr_writeback < 0)
	56	ps.nr_writeback = 0;
c07e02db MH	57	if ((long)ps.nr_slab < 0)
	58	ps.nr_slab = 0;
	59
1da177e4 LT	60	n = sprintf(buf, "\n"
	61	"Node %d MemTotal: %8lu kB\n"
	62	"Node %d MemFree: %8lu kB\n"
	63	"Node %d MemUsed: %8lu kB\n"
	64	"Node %d Active: %8lu kB\n"
	65	"Node %d Inactive: %8lu kB\n"
	66	"Node %d HighTotal: %8lu kB\n"
	67	"Node %d HighFree: %8lu kB\n"
	68	"Node %d LowTotal: %8lu kB\n"
c07e02db MH	69	"Node %d LowFree: %8lu kB\n"
	70	"Node %d Dirty: %8lu kB\n"
	71	"Node %d Writeback: %8lu kB\n"
347ce434	72	"Node %d FilePages: %8lu kB\n"
c07e02db	73	"Node %d Mapped: %8lu kB\n"
f3dbd344	74	"Node %d AnonPages: %8lu kB\n"
c07e02db	75	"Node %d Slab: %8lu kB\n",
1da177e4 LT	76	nid, K(i.totalram),
	77	nid, K(i.freeram),
	78	nid, K(i.totalram - i.freeram),
	79	nid, K(active),
	80	nid, K(inactive),
	81	nid, K(i.totalhigh),
	82	nid, K(i.freehigh),
	83	nid, K(i.totalram - i.totalhigh),
c07e02db MH	84	nid, K(i.freeram - i.freehigh),
	85	nid, K(ps.nr_dirty),
	86	nid, K(ps.nr_writeback),
347ce434	87	nid, K(node_page_state(nid, NR_FILE_PAGES)),
65ba55f5	88	nid, K(node_page_state(nid, NR_FILE_MAPPED)),
f3dbd344	89	nid, K(node_page_state(nid, NR_ANON_PAGES)),
c07e02db	90	nid, K(ps.nr_slab));
1da177e4 LT	91	n += hugetlb_report_node_meminfo(nid, buf + n);
	92	return n;
	93	}
	94
	95	#undef K
	96	static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
	97
	98	static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
	99	{
	100	unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
	101	unsigned long local_node, other_node;
	102	int i, cpu;
	103	pg_data_t *pg = NODE_DATA(dev->id);
	104	numa_hit = 0;
	105	numa_miss = 0;
	106	interleave_hit = 0;
	107	numa_foreign = 0;
	108	local_node = 0;
	109	other_node = 0;
	110	for (i = 0; i < MAX_NR_ZONES; i++) {
	111	struct zone *z = &pg->node_zones[i];
54404e72	112	for_each_online_cpu(cpu) {
e7c8d5c9	113	struct per_cpu_pageset *ps = zone_pcp(z,cpu);
1da177e4 LT	114	numa_hit += ps->numa_hit;
	115	numa_miss += ps->numa_miss;
	116	numa_foreign += ps->numa_foreign;
	117	interleave_hit += ps->interleave_hit;
	118	local_node += ps->local_node;
	119	other_node += ps->other_node;
	120	}
	121	}
	122	return sprintf(buf,
	123	"numa_hit %lu\n"
	124	"numa_miss %lu\n"
	125	"numa_foreign %lu\n"
	126	"interleave_hit %lu\n"
	127	"local_node %lu\n"
	128	"other_node %lu\n",
	129	numa_hit,
	130	numa_miss,
	131	numa_foreign,
	132	interleave_hit,
	133	local_node,
	134	other_node);
	135	}
	136	static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
	137
	138	static ssize_t node_read_distance(struct sys_device * dev, char * buf)
	139	{
	140	int nid = dev->id;
	141	int len = 0;
	142	int i;
	143
	144	/* buf currently PAGE_SIZE, need ~4 chars per node */
	145	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
	146
	147	for_each_online_node(i)
	148	len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
	149
	150	len += sprintf(buf + len, "\n");
	151	return len;
	152	}
	153	static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
	154
	155
	156	/*
	157	* register_node - Setup a driverfs device for a node.
	158	* @num - Node number to use when creating the device.
	159	*
	160	* Initialize and register the node device.
	161	*/
4b45099b	162	int register_node(struct node node, int num, struct node parent)
1da177e4 LT	163	{
	164	int error;
	165
	166	node->sysdev.id = num;
	167	node->sysdev.cls = &node_class;
	168	error = sysdev_register(&node->sysdev);
	169
	170	if (!error){
	171	sysdev_create_file(&node->sysdev, &attr_cpumap);
	172	sysdev_create_file(&node->sysdev, &attr_meminfo);
	173	sysdev_create_file(&node->sysdev, &attr_numastat);
	174	sysdev_create_file(&node->sysdev, &attr_distance);
	175	}
	176	return error;
	177	}
	178
4b45099b KT	179	/**
	180	* unregister_node - unregister a node device
	181	* @node: node going away
	182	*
	183	* Unregisters a node device @node. All the devices on the node must be
	184	* unregistered before calling this function.
	185	*/
	186	void unregister_node(struct node *node)
	187	{
	188	sysdev_remove_file(&node->sysdev, &attr_cpumap);
	189	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	190	sysdev_remove_file(&node->sysdev, &attr_numastat);
	191	sysdev_remove_file(&node->sysdev, &attr_distance);
	192
	193	sysdev_unregister(&node->sysdev);
	194	}
1da177e4	195
0fc44159 YG	196	struct node node_devices[MAX_NUMNODES];
0fc44159 YG	197
76b67ed9 KH	198	/*
	199	* register cpu under node
	200	*/
	201	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	202	{
	203	if (node_online(nid)) {
	204	struct sys_device *obj = get_cpu_sysdev(cpu);
	205	if (!obj)
	206	return 0;
	207	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
	208	&obj->kobj,
	209	kobject_name(&obj->kobj));
	210	}
	211
	212	return 0;
	213	}
	214
	215	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	216	{
	217	if (node_online(nid)) {
	218	struct sys_device *obj = get_cpu_sysdev(cpu);
	219	if (obj)
	220	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	221	kobject_name(&obj->kobj));
	222	}
	223	return 0;
	224	}
	225
0fc44159 YG	226	int register_one_node(int nid)
	227	{
	228	int error = 0;
76b67ed9	229	int cpu;
0fc44159 YG	230
	231	if (node_online(nid)) {
	232	int p_node = parent_node(nid);
	233	struct node *parent = NULL;
	234
	235	if (p_node != nid)
	236	parent = &node_devices[p_node];
	237
	238	error = register_node(&node_devices[nid], nid, parent);
76b67ed9 KH	239
	240	/* link cpu under this node */
	241	for_each_present_cpu(cpu) {
	242	if (cpu_to_node(cpu) == nid)
	243	register_cpu_under_node(cpu, nid);
	244	}
0fc44159 YG	245	}
	246
	247	return error;
	248
	249	}
	250
	251	void unregister_one_node(int nid)
	252	{
	253	unregister_node(&node_devices[nid]);
	254	}
	255
4b45099b	256	static int __init register_node_type(void)
1da177e4 LT	257	{
	258	return sysdev_class_register(&node_class);
	259	}
	260	postcore_initcall(register_node_type);