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
22 struct 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
30 struct memory_block;
31 extern struct node *node_devices[];
32 typedef void (*node_registration_func_t)(struct node *);
33
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
link_mem_sections(int nid,unsigned long start_pfn,unsigned long nr_pages)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
43 extern void unregister_node(struct node *node);
44 #ifdef CONFIG_NUMA
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 */
register_one_node(int nid)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
66 extern void unregister_one_node(int nid);
67 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
68 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
69 extern int register_mem_sect_under_node(struct memory_block *mem_blk,
70 int nid);
71 extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
72 unsigned long phys_index);
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
78 #else
__register_one_node(int nid)79 static inline int __register_one_node(int nid)
80 {
81 return 0;
82 }
register_one_node(int nid)83 static inline int register_one_node(int nid)
84 {
85 return 0;
86 }
unregister_one_node(int nid)87 static inline int unregister_one_node(int nid)
88 {
89 return 0;
90 }
register_cpu_under_node(unsigned int cpu,unsigned int nid)91 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
92 {
93 return 0;
94 }
unregister_cpu_under_node(unsigned int cpu,unsigned int nid)95 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
96 {
97 return 0;
98 }
register_mem_sect_under_node(struct memory_block * mem_blk,int nid)99 static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
100 int nid)
101 {
102 return 0;
103 }
unregister_mem_sect_under_nodes(struct memory_block * mem_blk,unsigned long phys_index)104 static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
105 unsigned long phys_index)
106 {
107 return 0;
108 }
109
register_hugetlbfs_with_node(node_registration_func_t reg,node_registration_func_t unreg)110 static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
111 node_registration_func_t unreg)
112 {
113 }
114 #endif
115
116 #define to_node(device) container_of(device, struct node, dev)
117
118 #endif /* _LINUX_NODE_H_ */
119