[net-next-2.6.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, 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;

	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"
#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 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, node_page_state(nid, NR_ACTIVE),
		       nid, node_page_state(nid, NR_INACTIVE),
#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_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, 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, 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_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]);
}

/*
 * 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
	22	static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
	23	{
	24	struct node *node_dev = to_node(dev);
	25	cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
	26	int len;
	27
	28	/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
	29	BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
	30
	31	len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
	32	len += sprintf(buf + len, "\n");
	33	return len;
	34	}
	35
	36	static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
	37
	38	#define K(x) ((x) << (PAGE_SHIFT - 10))
	39	static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
	40	{
	41	int n;
	42	int nid = dev->id;
	43	struct sysinfo i;
1da177e4 LT	44
1da177e4 LT	45	si_meminfo_node(&i, nid);
c07e02db	46
1da177e4 LT	47	n = sprintf(buf, "\n"
	48	"Node %d MemTotal: %8lu kB\n"
	49	"Node %d MemFree: %8lu kB\n"
	50	"Node %d MemUsed: %8lu kB\n"
	51	"Node %d Active: %8lu kB\n"
	52	"Node %d Inactive: %8lu kB\n"
182e8e23	53	#ifdef CONFIG_HIGHMEM
1da177e4 LT	54	"Node %d HighTotal: %8lu kB\n"
	55	"Node %d HighFree: %8lu kB\n"
	56	"Node %d LowTotal: %8lu kB\n"
c07e02db	57	"Node %d LowFree: %8lu kB\n"
182e8e23	58	#endif
c07e02db MH	59	"Node %d Dirty: %8lu kB\n"
c07e02db MH	60	"Node %d Writeback: %8lu kB\n"
347ce434	61	"Node %d FilePages: %8lu kB\n"
c07e02db	62	"Node %d Mapped: %8lu kB\n"
f3dbd344	63	"Node %d AnonPages: %8lu kB\n"
df849a15	64	"Node %d PageTables: %8lu kB\n"
f5ef68da	65	"Node %d NFS_Unstable: %8lu kB\n"
d2c5e30c	66	"Node %d Bounce: %8lu kB\n"
972d1a7b CL	67	"Node %d Slab: %8lu kB\n"
	68	"Node %d SReclaimable: %8lu kB\n"
	69	"Node %d SUnreclaim: %8lu kB\n",
1da177e4 LT	70	nid, K(i.totalram),
	71	nid, K(i.freeram),
	72	nid, K(i.totalram - i.freeram),
05a0416b CL	73	nid, node_page_state(nid, NR_ACTIVE),
05a0416b CL	74	nid, node_page_state(nid, NR_INACTIVE),
182e8e23	75	#ifdef CONFIG_HIGHMEM
1da177e4 LT	76	nid, K(i.totalhigh),
	77	nid, K(i.freehigh),
	78	nid, K(i.totalram - i.totalhigh),
c07e02db	79	nid, K(i.freeram - i.freehigh),
182e8e23	80	#endif
b1e7a8fd	81	nid, K(node_page_state(nid, NR_FILE_DIRTY)),
ce866b34	82	nid, K(node_page_state(nid, NR_WRITEBACK)),
347ce434	83	nid, K(node_page_state(nid, NR_FILE_PAGES)),
65ba55f5	84	nid, K(node_page_state(nid, NR_FILE_MAPPED)),
f3dbd344	85	nid, K(node_page_state(nid, NR_ANON_PAGES)),
df849a15	86	nid, K(node_page_state(nid, NR_PAGETABLE)),
fd39fc85	87	nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
d2c5e30c	88	nid, K(node_page_state(nid, NR_BOUNCE)),
972d1a7b CL	89	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
	90	node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
	91	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
	92	nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
1da177e4 LT	93	n += hugetlb_report_node_meminfo(nid, buf + n);
	94	return n;
	95	}
	96
	97	#undef K
	98	static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
	99
	100	static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
	101	{
1da177e4 LT	102	return sprintf(buf,
	103	"numa_hit %lu\n"
	104	"numa_miss %lu\n"
	105	"numa_foreign %lu\n"
	106	"interleave_hit %lu\n"
	107	"local_node %lu\n"
	108	"other_node %lu\n",
ca889e6c CL	109	node_page_state(dev->id, NUMA_HIT),
	110	node_page_state(dev->id, NUMA_MISS),
	111	node_page_state(dev->id, NUMA_FOREIGN),
	112	node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
	113	node_page_state(dev->id, NUMA_LOCAL),
	114	node_page_state(dev->id, NUMA_OTHER));
1da177e4 LT	115	}
	116	static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
	117
	118	static ssize_t node_read_distance(struct sys_device * dev, char * buf)
	119	{
	120	int nid = dev->id;
	121	int len = 0;
	122	int i;
	123
	124	/* buf currently PAGE_SIZE, need ~4 chars per node */
	125	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
	126
	127	for_each_online_node(i)
	128	len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
	129
	130	len += sprintf(buf + len, "\n");
	131	return len;
	132	}
	133	static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
	134
	135
	136	/*
405ae7d3	137	* register_node - Setup a sysfs device for a node.
1da177e4 LT	138	* @num - Node number to use when creating the device.
	139	*
	140	* Initialize and register the node device.
	141	*/
4b45099b	142	int register_node(struct node node, int num, struct node parent)
1da177e4 LT	143	{
	144	int error;
	145
	146	node->sysdev.id = num;
	147	node->sysdev.cls = &node_class;
	148	error = sysdev_register(&node->sysdev);
	149
	150	if (!error){
	151	sysdev_create_file(&node->sysdev, &attr_cpumap);
	152	sysdev_create_file(&node->sysdev, &attr_meminfo);
	153	sysdev_create_file(&node->sysdev, &attr_numastat);
	154	sysdev_create_file(&node->sysdev, &attr_distance);
	155	}
	156	return error;
	157	}
	158
4b45099b KT	159	/**
	160	* unregister_node - unregister a node device
	161	* @node: node going away
	162	*
	163	* Unregisters a node device @node. All the devices on the node must be
	164	* unregistered before calling this function.
	165	*/
	166	void unregister_node(struct node *node)
	167	{
	168	sysdev_remove_file(&node->sysdev, &attr_cpumap);
	169	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	170	sysdev_remove_file(&node->sysdev, &attr_numastat);
	171	sysdev_remove_file(&node->sysdev, &attr_distance);
	172
	173	sysdev_unregister(&node->sysdev);
	174	}
1da177e4	175
0fc44159 YG	176	struct node node_devices[MAX_NUMNODES];
0fc44159 YG	177
76b67ed9 KH	178	/*
	179	* register cpu under node
	180	*/
	181	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	182	{
	183	if (node_online(nid)) {
	184	struct sys_device *obj = get_cpu_sysdev(cpu);
	185	if (!obj)
	186	return 0;
	187	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
	188	&obj->kobj,
	189	kobject_name(&obj->kobj));
	190	}
	191
	192	return 0;
	193	}
	194
	195	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	196	{
	197	if (node_online(nid)) {
	198	struct sys_device *obj = get_cpu_sysdev(cpu);
	199	if (obj)
	200	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	201	kobject_name(&obj->kobj));
	202	}
	203	return 0;
	204	}
	205
0fc44159 YG	206	int register_one_node(int nid)
	207	{
	208	int error = 0;
76b67ed9	209	int cpu;
0fc44159 YG	210
	211	if (node_online(nid)) {
	212	int p_node = parent_node(nid);
	213	struct node *parent = NULL;
	214
	215	if (p_node != nid)
	216	parent = &node_devices[p_node];
	217
	218	error = register_node(&node_devices[nid], nid, parent);
76b67ed9 KH	219
	220	/* link cpu under this node */
	221	for_each_present_cpu(cpu) {
	222	if (cpu_to_node(cpu) == nid)
	223	register_cpu_under_node(cpu, nid);
	224	}
0fc44159 YG	225	}
	226
	227	return error;
	228
	229	}
	230
	231	void unregister_one_node(int nid)
	232	{
	233	unregister_node(&node_devices[nid]);
	234	}
	235
bde631a5 LS	236	/*
	237	* node states attributes
	238	*/
	239
	240	static ssize_t print_nodes_state(enum node_states state, char *buf)
	241	{
	242	int n;
	243
	244	n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
	245	if (n > 0 && PAGE_SIZE > n + 1) {
	246	*(buf + n++) = '\n';
	247	*(buf + n++) = '\0';
	248	}
	249	return n;
	250	}
	251
	252	static ssize_t print_nodes_possible(struct sysdev_class class, char buf)
	253	{
	254	return print_nodes_state(N_POSSIBLE, buf);
	255	}
	256
	257	static ssize_t print_nodes_online(struct sysdev_class class, char buf)
	258	{
	259	return print_nodes_state(N_ONLINE, buf);
	260	}
	261
	262	static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
	263	char *buf)
	264	{
	265	return print_nodes_state(N_NORMAL_MEMORY, buf);
	266	}
	267
	268	static ssize_t print_nodes_has_cpu(struct sysdev_class class, char buf)
	269	{
	270	return print_nodes_state(N_CPU, buf);
	271	}
	272
	273	static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
	274	static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
	275	static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
	276	NULL);
	277	static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
	278
	279	#ifdef CONFIG_HIGHMEM
	280	static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
	281	char *buf)
	282	{
	283	return print_nodes_state(N_HIGH_MEMORY, buf);
	284	}
	285
	286	static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
	287	NULL);
	288	#endif
	289
	290	struct sysdev_class_attribute *node_state_attr[] = {
	291	&attr_possible,
	292	&attr_online,
	293	&attr_has_normal_memory,
	294	#ifdef CONFIG_HIGHMEM
	295	&attr_has_high_memory,
	296	#endif
	297	&attr_has_cpu,
	298	};
	299
300	static int node_states_init(void)
301	{
302	int i;
303	int err = 0;
304
305	for (i = 0; i < NR_NODE_STATES; i++) {
306	int ret;
307	ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
308	if (!err)
309	err = ret;
310	}
311	return err;
312	}
313
4b45099b	314	static int __init register_node_type(void)
1da177e4	315	{
bde631a5 LS	316	int ret;
	317
	318	ret = sysdev_class_register(&node_class);
	319	if (!ret)
	320	ret = node_states_init();
	321
	322	/*
	323	* Note: we're not going to unregister the node class if we fail
	324	* to register the node state class attribute files.
	325	*/
	326	return ret;
1da177e4 LT	327	}
1da177e4 LT	328	postcore_initcall(register_node_type);