[mirror_ubuntu-eoan-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 end_pfn);
#else
static inline int link_mem_sections(int nid, unsigned long start_pfn,
				    unsigned long end_pfn)
{
	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);
		unsigned long start_pfn = pgdat->node_start_pfn;
		unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;

		error = __register_one_node(nid);
		if (error)
			return error;
		/* link memory sections under this node */
		error = link_mem_sections(nid, start_pfn, end_pfn);
	}

	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,
						void *arg);
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,
							void *arg)
{
	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	35	extern int link_mem_sections(int nid, unsigned long start_pfn,
4fbce633	36	unsigned long end_pfn);
9037a993	37	#else
a2155861	38	static inline int link_mem_sections(int nid, unsigned long start_pfn,
4fbce633	39	unsigned long end_pfn)
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);
4fbce633 OS	57	unsigned long start_pfn = pgdat->node_start_pfn;
4fbce633 OS	58	unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
9037a993 MH	59
	60	error = __register_one_node(nid);
	61	if (error)
	62	return error;
	63	/* link memory sections under this node */
4fbce633	64	error = link_mem_sections(nid, start_pfn, end_pfn);
9037a993 MH	65	}
	66
	67	return error;
	68	}
	69
0fc44159	70	extern void unregister_one_node(int nid);
76b67ed9 KH	71	extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
76b67ed9 KH	72	extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
c04fc586	73	extern int register_mem_sect_under_node(struct memory_block *mem_blk,
4fbce633	74	void *arg);
d3360164 NF	75	extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
d3360164 NF	76	unsigned long phys_index);
9a305230 LS	77
	78	#ifdef CONFIG_HUGETLBFS
	79	extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
	80	node_registration_func_t unregister);
	81	#endif
76b67ed9	82	#else
9037a993 MH	83	static inline int __register_one_node(int nid)
	84	{
	85	return 0;
	86	}
36920e06 KH	87	static inline int register_one_node(int nid)
	88	{
	89	return 0;
	90	}
	91	static inline int unregister_one_node(int nid)
	92	{
	93	return 0;
	94	}
76b67ed9 KH	95	static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
	96	{
	97	return 0;
	98	}
	99	static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
	100	{
	101	return 0;
	102	}
c04fc586	103	static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
4fbce633	104	void *arg)
c04fc586 GH	105	{
	106	return 0;
	107	}
d3360164 NF	108	static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
d3360164 NF	109	unsigned long phys_index)
c04fc586 GH	110	{
	111	return 0;
	112	}
9a305230 LS	113
	114	static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
	115	node_registration_func_t unreg)
	116	{
	117	}
76b67ed9	118	#endif
1da177e4	119
10fbcf4c	120	#define to_node(device) container_of(device, struct node, dev)
1da177e4 LT	121
1da177e4 LT	122	#endif /* _LINUX_NODE_H_ */