[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>

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_mapped < 0)
		ps.nr_mapped = 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 Mapped:       %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(ps.nr_mapped),
		       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 (cpu = 0; cpu < NR_CPUS; 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);
}

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>
	14
	15	static struct sysdev_class node_class = {
	16	set_kset_name("node"),
	17	};
	18
	19
	20	static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
	21	{
	22	struct node *node_dev = to_node(dev);
	23	cpumask_t mask = node_to_cpumask(node_dev->sysdev.id);
	24	int len;
	25
	26	/* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
	27	BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
	28
	29	len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask);
	30	len += sprintf(buf + len, "\n");
	31	return len;
	32	}
	33
	34	static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
	35
	36	#define K(x) ((x) << (PAGE_SHIFT - 10))
	37	static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
	38	{
	39	int n;
	40	int nid = dev->id;
	41	struct sysinfo i;
c07e02db	42	struct page_state ps;
1da177e4 LT	43	unsigned long inactive;
	44	unsigned long active;
	45	unsigned long free;
	46
	47	si_meminfo_node(&i, nid);
c07e02db	48	get_page_state_node(&ps, nid);
1da177e4 LT	49	__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
1da177e4 LT	50
c07e02db MH	51	/* Check for negative values in these approximate counters */
	52	if ((long)ps.nr_dirty < 0)
	53	ps.nr_dirty = 0;
	54	if ((long)ps.nr_writeback < 0)
	55	ps.nr_writeback = 0;
	56	if ((long)ps.nr_mapped < 0)
	57	ps.nr_mapped = 0;
	58	if ((long)ps.nr_slab < 0)
	59	ps.nr_slab = 0;
	60
1da177e4 LT	61	n = sprintf(buf, "\n"
	62	"Node %d MemTotal: %8lu kB\n"
	63	"Node %d MemFree: %8lu kB\n"
	64	"Node %d MemUsed: %8lu kB\n"
	65	"Node %d Active: %8lu kB\n"
	66	"Node %d Inactive: %8lu kB\n"
	67	"Node %d HighTotal: %8lu kB\n"
	68	"Node %d HighFree: %8lu kB\n"
	69	"Node %d LowTotal: %8lu kB\n"
c07e02db MH	70	"Node %d LowFree: %8lu kB\n"
	71	"Node %d Dirty: %8lu kB\n"
	72	"Node %d Writeback: %8lu kB\n"
	73	"Node %d Mapped: %8lu kB\n"
	74	"Node %d Slab: %8lu kB\n",
1da177e4 LT	75	nid, K(i.totalram),
	76	nid, K(i.freeram),
	77	nid, K(i.totalram - i.freeram),
	78	nid, K(active),
	79	nid, K(inactive),
	80	nid, K(i.totalhigh),
	81	nid, K(i.freehigh),
	82	nid, K(i.totalram - i.totalhigh),
c07e02db MH	83	nid, K(i.freeram - i.freehigh),
	84	nid, K(ps.nr_dirty),
	85	nid, K(ps.nr_writeback),
	86	nid, K(ps.nr_mapped),
	87	nid, K(ps.nr_slab));
1da177e4 LT	88	n += hugetlb_report_node_meminfo(nid, buf + n);
	89	return n;
	90	}
	91
	92	#undef K
	93	static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
	94
	95	static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
	96	{
	97	unsigned long numa_hit, numa_miss, interleave_hit, numa_foreign;
	98	unsigned long local_node, other_node;
	99	int i, cpu;
	100	pg_data_t *pg = NODE_DATA(dev->id);
	101	numa_hit = 0;
	102	numa_miss = 0;
	103	interleave_hit = 0;
	104	numa_foreign = 0;
	105	local_node = 0;
	106	other_node = 0;
	107	for (i = 0; i < MAX_NR_ZONES; i++) {
	108	struct zone *z = &pg->node_zones[i];
	109	for (cpu = 0; cpu < NR_CPUS; cpu++) {
e7c8d5c9	110	struct per_cpu_pageset *ps = zone_pcp(z,cpu);
1da177e4 LT	111	numa_hit += ps->numa_hit;
	112	numa_miss += ps->numa_miss;
	113	numa_foreign += ps->numa_foreign;
	114	interleave_hit += ps->interleave_hit;
	115	local_node += ps->local_node;
	116	other_node += ps->other_node;
	117	}
	118	}
	119	return sprintf(buf,
	120	"numa_hit %lu\n"
	121	"numa_miss %lu\n"
	122	"numa_foreign %lu\n"
	123	"interleave_hit %lu\n"
	124	"local_node %lu\n"
	125	"other_node %lu\n",
	126	numa_hit,
	127	numa_miss,
	128	numa_foreign,
	129	interleave_hit,
	130	local_node,
	131	other_node);
	132	}
	133	static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
	134
	135	static ssize_t node_read_distance(struct sys_device * dev, char * buf)
	136	{
	137	int nid = dev->id;
	138	int len = 0;
	139	int i;
	140
	141	/* buf currently PAGE_SIZE, need ~4 chars per node */
	142	BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
	143
	144	for_each_online_node(i)
	145	len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
	146
	147	len += sprintf(buf + len, "\n");
	148	return len;
	149	}
	150	static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
	151
	152
	153	/*
	154	* register_node - Setup a driverfs device for a node.
	155	* @num - Node number to use when creating the device.
	156	*
	157	* Initialize and register the node device.
	158	*/
4b45099b	159	int register_node(struct node node, int num, struct node parent)
1da177e4 LT	160	{
	161	int error;
	162
	163	node->sysdev.id = num;
	164	node->sysdev.cls = &node_class;
	165	error = sysdev_register(&node->sysdev);
	166
	167	if (!error){
	168	sysdev_create_file(&node->sysdev, &attr_cpumap);
	169	sysdev_create_file(&node->sysdev, &attr_meminfo);
	170	sysdev_create_file(&node->sysdev, &attr_numastat);
	171	sysdev_create_file(&node->sysdev, &attr_distance);
	172	}
	173	return error;
	174	}
	175
4b45099b KT	176	/**
	177	* unregister_node - unregister a node device
	178	* @node: node going away
	179	*
	180	* Unregisters a node device @node. All the devices on the node must be
	181	* unregistered before calling this function.
	182	*/
	183	void unregister_node(struct node *node)
	184	{
	185	sysdev_remove_file(&node->sysdev, &attr_cpumap);
	186	sysdev_remove_file(&node->sysdev, &attr_meminfo);
	187	sysdev_remove_file(&node->sysdev, &attr_numastat);
	188	sysdev_remove_file(&node->sysdev, &attr_distance);
	189
	190	sysdev_unregister(&node->sysdev);
	191	}
1da177e4	192
4b45099b	193	static int __init register_node_type(void)
1da177e4 LT	194	{
	195	return sysdev_class_register(&node_class);
	196	}
	197	postcore_initcall(register_node_type);