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, |
36 | unsigned long end_pfn); |
37 | #else |
38 | static inline int link_mem_sections(int nid, unsigned long start_pfn, |
39 | unsigned long end_pfn) |
40 | { |
41 | return 0; |
42 | } |
43 | #endif |
44 | |
45 | extern void unregister_node(struct node *node); |
46 | #ifdef CONFIG_NUMA |
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 | 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 | |
70 | extern void unregister_one_node(int nid); |
71 | extern int register_cpu_under_node(unsigned int cpu, unsigned int nid); |
72 | extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid); |
73 | extern int register_mem_sect_under_node(struct memory_block *mem_blk, |
74 | void *arg); |
75 | extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, |
76 | unsigned long phys_index); |
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 |
82 | #else |
83 | static inline int __register_one_node(int nid) |
84 | { |
85 | return 0; |
86 | } |
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 | } |
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 | } |
103 | static inline int register_mem_sect_under_node(struct memory_block *mem_blk, |
104 | void *arg) |
105 | { |
106 | return 0; |
107 | } |
108 | static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, |
109 | unsigned long phys_index) |
110 | { |
111 | return 0; |
112 | } |
113 | |
114 | static 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 | |