[linux-2.6-block.git] / include / linux / node.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * include/linux/node.h - generic node definition
 *
 * This is mainly for topological representation. We define the 
 * basic 'struct node' here, which can be embedded in per-arch 
 * definitions of processors.
 *
 * Basic handling of the devices is done in drivers/base/node.c
 * and system devices are handled in drivers/base/sys.c. 
 *
 * Nodes are exported via driverfs in the class/node/devices/
 * directory. 
 */
#ifndef _LINUX_NODE_H_
#define _LINUX_NODE_H_

#include <linux/device.h>
#include <linux/cpumask.h>
#include <linux/workqueue.h>

struct node {
	struct device	dev;

#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
	struct work_struct	node_work;
#endif
};

struct memory_block;
extern struct node *node_devices[];
typedef  void (*node_registration_func_t)(struct node *);

#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
extern int link_mem_sections(int nid, unsigned long start_pfn,
			     unsigned long nr_pages, bool check_nid);
#else
static inline int link_mem_sections(int nid, unsigned long start_pfn,
				    unsigned long nr_pages, bool check_nid)
{
	return 0;
}
#endif

extern void unregister_node(struct node *node);
#ifdef CONFIG_NUMA
/* Core of the node registration - only memory hotplug should use this */
extern int __register_one_node(int nid);

/* Registers an online node */
static inline int register_one_node(int nid)
{
	int error = 0;

	if (node_online(nid)) {
		struct pglist_data *pgdat = NODE_DATA(nid);

		error = __register_one_node(nid);
		if (error)
			return error;
		/* link memory sections under this node */
		error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages, true);
	}

	return error;
}

extern void unregister_one_node(int nid);
extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int register_mem_sect_under_node(struct memory_block *mem_blk,
						int nid, bool check_nid);
extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
					   unsigned long phys_index);

#ifdef CONFIG_HUGETLBFS
extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
					 node_registration_func_t unregister);
#endif
#else
static inline int __register_one_node(int nid)
{
	return 0;
}
static inline int register_one_node(int nid)
{
	return 0;
}
static inline int unregister_one_node(int nid)
{
	return 0;
}
static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	return 0;
}
static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	return 0;
}
static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
							int nid, bool check_nid)
{
	return 0;
}
static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
						  unsigned long phys_index)
{
	return 0;
}

static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
						node_registration_func_t unreg)
{
}
#endif

#define to_node(device) container_of(device, struct node, dev)

#endif /* _LINUX_NODE_H_ */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* include/linux/node.h - generic node definition
	4	*
	5	* This is mainly for topological representation. We define the
	6	* basic 'struct node' here, which can be embedded in per-arch
	7	* definitions of processors.
	8	*
	9	* Basic handling of the devices is done in drivers/base/node.c
	10	* and system devices are handled in drivers/base/sys.c.
	11	*
	12	* Nodes are exported via driverfs in the class/node/devices/
	13	* directory.
1da177e4 LT	14	*/
	15	#ifndef _LINUX_NODE_H_
	16	#define _LINUX_NODE_H_
	17
10fbcf4c	18	#include <linux/device.h>
1da177e4	19	#include <linux/cpumask.h>
39da08cb	20	#include <linux/workqueue.h>
1da177e4 LT	21
1da177e4 LT	22	struct node {
10fbcf4c	23	struct device dev;
39da08cb LS	24
	25	#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
	26	struct work_struct node_work;
	27	#endif
1da177e4 LT	28	};
1da177e4 LT	29
c04fc586	30	struct memory_block;
8732794b	31	extern struct node *node_devices[];
9a305230	32	typedef void (node_registration_func_t)(struct node );
0fc44159	33
9037a993	34	#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
a2155861 JC	35	extern int link_mem_sections(int nid, unsigned long start_pfn,
a2155861 JC	36	unsigned long nr_pages, bool check_nid);
9037a993	37	#else
a2155861 JC	38	static inline int link_mem_sections(int nid, unsigned long start_pfn,
a2155861 JC	39	unsigned long nr_pages, bool check_nid)
9037a993 MH	40	{
	41	return 0;
	42	}
	43	#endif
	44
4b45099b	45	extern void unregister_node(struct node *node);
36920e06	46	#ifdef CONFIG_NUMA
9037a993 MH	47	/* Core of the node registration - only memory hotplug should use this */
	48	extern int __register_one_node(int nid);
	49
	50	/* Registers an online node */
	51	static inline int register_one_node(int nid)
	52	{
	53	int error = 0;
	54
	55	if (node_online(nid)) {
	56	struct pglist_data *pgdat = NODE_DATA(nid);
	57
	58	error = __register_one_node(nid);
	59	if (error)
	60	return error;
	61	/* link memory sections under this node */
a2155861	62	error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages, true);
9037a993 MH	63	}
	64
	65	return error;
	66	}
	67
0fc44159	68	extern void unregister_one_node(int nid);
76b67ed9 KH	69	extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
76b67ed9 KH	70	extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
c04fc586	71	extern int register_mem_sect_under_node(struct memory_block *mem_blk,
fc44f7f9	72	int nid, bool check_nid);
d3360164 NF	73	extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
d3360164 NF	74	unsigned long phys_index);
9a305230 LS	75
	76	#ifdef CONFIG_HUGETLBFS
	77	extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
	78	node_registration_func_t unregister);
	79	#endif
76b67ed9	80	#else
9037a993 MH	81	static inline int __register_one_node(int nid)
	82	{
	83	return 0;
	84	}
36920e06 KH	85	static inline int register_one_node(int nid)
	86	{
	87	return 0;
	88	}
	89	static inline int unregister_one_node(int nid)
	90	{
	91	return 0;
	92	}
76b67ed9 KH	93	static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	94	{
	95	return 0;
	96	}
	97	static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	98	{
	99	return 0;
	100	}
c04fc586	101	static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
fc44f7f9	102	int nid, bool check_nid)
c04fc586 GH	103	{
	104	return 0;
	105	}
d3360164 NF	106	static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
d3360164 NF	107	unsigned long phys_index)
c04fc586 GH	108	{
	109	return 0;
	110	}
9a305230 LS	111
	112	static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
	113	node_registration_func_t unreg)
	114	{
	115	}
76b67ed9	116	#endif
1da177e4	117
10fbcf4c	118	#define to_node(device) container_of(device, struct node, dev)
1da177e4 LT	119
1da177e4 LT	120	#endif /* _LINUX_NODE_H_ */