/* * 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>#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);	node_to_cpumask_ptr(mask, 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"#ifdef CONFIG_UNEVICTABLE_LRU		       "Node %d Unevictable:    %8lu kB\n"		       "Node %d Mlocked:        %8lu kB\n"#endif#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)),#ifdef CONFIG_UNEVICTABLE_LRU		       nid, K(node_page_state(nid, NR_UNEVICTABLE)),		       nid, K(node_page_state(nid, NR_MLOCK)),#endif#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 Kstatic 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;} 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_HIGHMEMstatic 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);