[mirror_ubuntu-zesty-kernel.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;

	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]);
}

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;
1da177e4 LT	43
1da177e4 LT	44	si_meminfo_node(&i, nid);
c07e02db	45
1da177e4 LT	46	n = sprintf(buf, "\n"
	47	"Node %d MemTotal: %8lu kB\n"
	48	"Node %d MemFree: %8lu kB\n"
	49	"Node %d MemUsed: %8lu kB\n"
	50	"Node %d Active: %8lu kB\n"
	51	"Node %d Inactive: %8lu kB\n"
182e8e23	52	#ifdef CONFIG_HIGHMEM
1da177e4 LT	53	"Node %d HighTotal: %8lu kB\n"
	54	"Node %d HighFree: %8lu kB\n"
	55	"Node %d LowTotal: %8lu kB\n"
c07e02db	56	"Node %d LowFree: %8lu kB\n"
182e8e23	57	#endif
c07e02db MH	58	"Node %d Dirty: %8lu kB\n"
c07e02db MH	59	"Node %d Writeback: %8lu kB\n"
347ce434	60	"Node %d FilePages: %8lu kB\n"
c07e02db	61	"Node %d Mapped: %8lu kB\n"
f3dbd344	62	"Node %d AnonPages: %8lu kB\n"
df849a15	63	"Node %d PageTables: %8lu kB\n"
f5ef68da	64	"Node %d NFS_Unstable: %8lu kB\n"
d2c5e30c	65	"Node %d Bounce: %8lu kB\n"
972d1a7b CL	66	"Node %d Slab: %8lu kB\n"
	67	"Node %d SReclaimable: %8lu kB\n"
	68	"Node %d SUnreclaim: %8lu kB\n",
1da177e4 LT	69	nid, K(i.totalram),
	70	nid, K(i.freeram),
	71	nid, K(i.totalram - i.freeram),
05a0416b CL	72	nid, node_page_state(nid, NR_ACTIVE),
05a0416b CL	73	nid, node_page_state(nid, NR_INACTIVE),
182e8e23	74	#ifdef CONFIG_HIGHMEM
1da177e4 LT	75	nid, K(i.totalhigh),
	76	nid, K(i.freehigh),
	77	nid, K(i.totalram - i.totalhigh),
c07e02db	78	nid, K(i.freeram - i.freehigh),
182e8e23	79	#endif
b1e7a8fd	80	nid, K(node_page_state(nid, NR_FILE_DIRTY)),
ce866b34	81	nid, K(node_page_state(nid, NR_WRITEBACK)),
347ce434	82	nid, K(node_page_state(nid, NR_FILE_PAGES)),
65ba55f5	83	nid, K(node_page_state(nid, NR_FILE_MAPPED)),
f3dbd344	84	nid, K(node_page_state(nid, NR_ANON_PAGES)),
df849a15	85	nid, K(node_page_state(nid, NR_PAGETABLE)),
fd39fc85	86	nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
d2c5e30c	87	nid, K(node_page_state(nid, NR_BOUNCE)),
972d1a7b CL	88	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
	89	node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
	90	nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
	91	nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
1da177e4 LT	92	n += hugetlb_report_node_meminfo(nid, buf + n);
	93	return n;
	94	}
	95
	96	#undef K
	97	static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
	98
	99	static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
	100	{
1da177e4 LT	101	return sprintf(buf,
	102	"numa_hit %lu\n"
	103	"numa_miss %lu\n"
	104	"numa_foreign %lu\n"
	105	"interleave_hit %lu\n"
	106	"local_node %lu\n"
	107	"other_node %lu\n",
ca889e6c CL	108	node_page_state(dev->id, NUMA_HIT),
	109	node_page_state(dev->id, NUMA_MISS),
	110	node_page_state(dev->id, NUMA_FOREIGN),
	111	node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
	112	node_page_state(dev->id, NUMA_LOCAL),
	113	node_page_state(dev->id, NUMA_OTHER));
1da177e4 LT	114	}
	115	static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
	116
	117	static ssize_t node_read_distance(struct sys_device * dev, char * buf)
	118	{
	119	int nid = dev->id;
	120	int len = 0;
	121	int i;
	122
	123	/* buf currently PAGE_SIZE, need ~4 chars per node */
	124	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
	125
	126	for_each_online_node(i)
	127	len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
	128
	129	len += sprintf(buf + len, "\n");
	130	return len;
	131	}
	132	static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
	133
	134
	135	/*
405ae7d3	136	* register_node - Setup a sysfs device for a node.
1da177e4 LT	137	* @num - Node number to use when creating the device.
	138	*
	139	* Initialize and register the node device.
	140	*/
4b45099b	141	int register_node(struct node node, int num, struct node parent)
1da177e4 LT	142	{
	143	int error;
	144
	145	node->sysdev.id = num;
	146	node->sysdev.cls = &node_class;
	147	error = sysdev_register(&node->sysdev);
	148
	149	if (!error){
	150	sysdev_create_file(&node->sysdev, &attr_cpumap);
	151	sysdev_create_file(&node->sysdev, &attr_meminfo);
	152	sysdev_create_file(&node->sysdev, &attr_numastat);
	153	sysdev_create_file(&node->sysdev, &attr_distance);
	154	}
	155	return error;
	156	}
	157
4b45099b KT	158	/**
	159	* unregister_node - unregister a node device
	160	* @node: node going away
	161	*
	162	* Unregisters a node device @node. All the devices on the node must be
	163	* unregistered before calling this function.
	164	*/
	165	void unregister_node(struct node *node)
	166	{
	167	sysdev_remove_file(&node->sysdev, &attr_cpumap);
	168	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	169	sysdev_remove_file(&node->sysdev, &attr_numastat);
	170	sysdev_remove_file(&node->sysdev, &attr_distance);
	171
	172	sysdev_unregister(&node->sysdev);
	173	}
1da177e4	174
0fc44159 YG	175	struct node node_devices[MAX_NUMNODES];
0fc44159 YG	176
76b67ed9 KH	177	/*
	178	* register cpu under node
	179	*/
	180	int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	181	{
	182	if (node_online(nid)) {
	183	struct sys_device *obj = get_cpu_sysdev(cpu);
	184	if (!obj)
	185	return 0;
	186	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
	187	&obj->kobj,
	188	kobject_name(&obj->kobj));
	189	}
	190
	191	return 0;
	192	}
	193
	194	int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	195	{
	196	if (node_online(nid)) {
	197	struct sys_device *obj = get_cpu_sysdev(cpu);
	198	if (obj)
	199	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
	200	kobject_name(&obj->kobj));
	201	}
	202	return 0;
	203	}
	204
0fc44159 YG	205	int register_one_node(int nid)
	206	{
	207	int error = 0;
76b67ed9	208	int cpu;
0fc44159 YG	209
	210	if (node_online(nid)) {
	211	int p_node = parent_node(nid);
	212	struct node *parent = NULL;
	213
	214	if (p_node != nid)
	215	parent = &node_devices[p_node];
	216
	217	error = register_node(&node_devices[nid], nid, parent);
76b67ed9 KH	218
	219	/* link cpu under this node */
	220	for_each_present_cpu(cpu) {
	221	if (cpu_to_node(cpu) == nid)
	222	register_cpu_under_node(cpu, nid);
	223	}
0fc44159 YG	224	}
	225
	226	return error;
	227
	228	}
	229
	230	void unregister_one_node(int nid)
	231	{
	232	unregister_node(&node_devices[nid]);
	233	}
	234
4b45099b	235	static int __init register_node_type(void)
1da177e4 LT	236	{
	237	return sysdev_class_register(&node_class);
	238	}
	239	postcore_initcall(register_node_type);