1/* SPDX-License-Identifier: GPL-2.0 */
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.
14 */
15#ifndef _LINUX_NODE_H_
16#define _LINUX_NODE_H_
17
18#include <linux/device.h>
19#include <linux/cpumask.h>
20#include <linux/workqueue.h>
21
22struct node {
23 struct device dev;
24
25#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
26 struct work_struct node_work;
27#endif
28};
29
30struct memory_block;
31extern struct node *node_devices[];
32typedef void (*node_registration_func_t)(struct node *);
33
34#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
35extern int link_mem_sections(int nid, unsigned long start_pfn,
36 unsigned long end_pfn);
37#else
38static inline int link_mem_sections(int nid, unsigned long start_pfn,
39 unsigned long end_pfn)
40{
41 return 0;
42}
43#endif
44
45extern void unregister_node(struct node *node);
46#ifdef CONFIG_NUMA
47/* Core of the node registration - only memory hotplug should use this */
48extern int __register_one_node(int nid);
49
50/* Registers an online node */
51static 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 unsigned long start_pfn = pgdat->node_start_pfn;
58 unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
59
60 error = __register_one_node(nid);
61 if (error)
62 return error;
63 /* link memory sections under this node */
64 error = link_mem_sections(nid, start_pfn, end_pfn);
65 }
66
67 return error;
68}
69
70extern void unregister_one_node(int nid);
71extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
72extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
73extern int register_mem_sect_under_node(struct memory_block *mem_blk,
74 void *arg);
75extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
76 unsigned long phys_index);
77
78#ifdef CONFIG_HUGETLBFS
79extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
80 node_registration_func_t unregister);
81#endif
82#else
83static inline int __register_one_node(int nid)
84{
85 return 0;
86}
87static inline int register_one_node(int nid)
88{
89 return 0;
90}
91static inline int unregister_one_node(int nid)
92{
93 return 0;
94}
95static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
96{
97 return 0;
98}
99static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
100{
101 return 0;
102}
103static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
104 void *arg)
105{
106 return 0;
107}
108static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
109 unsigned long phys_index)
110{
111 return 0;
112}
113
114static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
115 node_registration_func_t unreg)
116{
117}
118#endif
119
120#define to_node(device) container_of(device, struct node, dev)
121
122#endif /* _LINUX_NODE_H_ */
123