[mirror_ubuntu-bionic-kernel.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);
#else
static inline int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages)
{
	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);
	}

	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);
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)
{
	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 MH	34	#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
	35	extern int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages);
	36	#else
	37	static inline int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages)
	38	{
	39	return 0;
	40	}
	41	#endif
	42
4b45099b	43	extern void unregister_node(struct node *node);
36920e06	44	#ifdef CONFIG_NUMA
9037a993 MH	45	/* Core of the node registration - only memory hotplug should use this */
	46	extern int __register_one_node(int nid);
	47
	48	/* Registers an online node */
	49	static inline int register_one_node(int nid)
	50	{
	51	int error = 0;
	52
	53	if (node_online(nid)) {
	54	struct pglist_data *pgdat = NODE_DATA(nid);
	55
	56	error = __register_one_node(nid);
	57	if (error)
	58	return error;
	59	/* link memory sections under this node */
	60	error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages);
	61	}
	62
	63	return error;
	64	}
	65
0fc44159	66	extern void unregister_one_node(int nid);
76b67ed9 KH	67	extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
76b67ed9 KH	68	extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
c04fc586 GH	69	extern int register_mem_sect_under_node(struct memory_block *mem_blk,
c04fc586 GH	70	int nid);
d3360164 NF	71	extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
d3360164 NF	72	unsigned long phys_index);
9a305230 LS	73
	74	#ifdef CONFIG_HUGETLBFS
	75	extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
	76	node_registration_func_t unregister);
	77	#endif
76b67ed9	78	#else
9037a993 MH	79	static inline int __register_one_node(int nid)
	80	{
	81	return 0;
	82	}
36920e06 KH	83	static inline int register_one_node(int nid)
	84	{
	85	return 0;
	86	}
	87	static inline int unregister_one_node(int nid)
	88	{
	89	return 0;
	90	}
76b67ed9 KH	91	static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	92	{
	93	return 0;
	94	}
	95	static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	96	{
	97	return 0;
	98	}
c04fc586 GH	99	static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
	100	int nid)
	101	{
	102	return 0;
	103	}
d3360164 NF	104	static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
d3360164 NF	105	unsigned long phys_index)
c04fc586 GH	106	{
	107	return 0;
	108	}
9a305230 LS	109
	110	static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
	111	node_registration_func_t unreg)
	112	{
	113	}
76b67ed9	114	#endif
1da177e4	115
10fbcf4c	116	#define to_node(device) container_of(device, struct node, dev)
1da177e4 LT	117
1da177e4 LT	118	#endif /* _LINUX_NODE_H_ */