1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * include/linux/node.h - generic node definit
4 *
5 * This is mainly for topological representati
6 * basic 'struct node' here, which can be embe
7 * definitions of processors.
8 *
9 * Basic handling of the devices is done in dr
10 * and system devices are handled in drivers/b
11 *
12 * Nodes are exported via driverfs in the clas
13 * directory.
14 */
15 #ifndef _LINUX_NODE_H_
16 #define _LINUX_NODE_H_
17
18 #include <linux/device.h>
19 #include <linux/list.h>
20
21 /**
22 * struct access_coordinate - generic performa
23 *
24 * @read_bandwidth: Read bandwidth in MB/s
25 * @write_bandwidth: Write bandwidth in MB/
26 * @read_latency: Read latency in nanose
27 * @write_latency: Write latency in nanos
28 */
29 struct access_coordinate {
30 unsigned int read_bandwidth;
31 unsigned int write_bandwidth;
32 unsigned int read_latency;
33 unsigned int write_latency;
34 };
35
36 /*
37 * ACCESS_COORDINATE_LOCAL correlates to ACCES
38 * - access_coordinate between target nod
39 * ACCESS_COORDINATE_CPU correlates to ACCESS
40 * - access_coordinate between target nod
41 */
42 enum access_coordinate_class {
43 ACCESS_COORDINATE_LOCAL,
44 ACCESS_COORDINATE_CPU,
45 ACCESS_COORDINATE_MAX
46 };
47
48 enum cache_indexing {
49 NODE_CACHE_DIRECT_MAP,
50 NODE_CACHE_INDEXED,
51 NODE_CACHE_OTHER,
52 };
53
54 enum cache_write_policy {
55 NODE_CACHE_WRITE_BACK,
56 NODE_CACHE_WRITE_THROUGH,
57 NODE_CACHE_WRITE_OTHER,
58 };
59
60 /**
61 * struct node_cache_attrs - system memory cac
62 *
63 * @indexing: The ways memory blocks
64 * @write_policy: Write back or write th
65 * @size: Total size of cache in
66 * @line_size: Number of bytes fetche
67 * @level: The cache hierarchy le
68 */
69 struct node_cache_attrs {
70 enum cache_indexing indexing;
71 enum cache_write_policy write_policy;
72 u64 size;
73 u16 line_size;
74 u8 level;
75 };
76
77 #ifdef CONFIG_HMEM_REPORTING
78 void node_add_cache(unsigned int nid, struct n
79 void node_set_perf_attrs(unsigned int nid, str
80 enum access_coordinat
81 #else
82 static inline void node_add_cache(unsigned int
83 struct node_
84 {
85 }
86
87 static inline void node_set_perf_attrs(unsigne
88 struct
89 enum ac
90 {
91 }
92 #endif
93
94 struct node {
95 struct device dev;
96 struct list_head access_list;
97 #ifdef CONFIG_HMEM_REPORTING
98 struct list_head cache_attrs;
99 struct device *cache_dev;
100 #endif
101 };
102
103 struct memory_block;
104 extern struct node *node_devices[];
105
106 #if defined(CONFIG_MEMORY_HOTPLUG) && defined(
107 void register_memory_blocks_under_node(int nid
108 unsigne
109 enum me
110 #else
111 static inline void register_memory_blocks_unde
112
113
114 {
115 }
116 #endif
117
118 extern void unregister_node(struct node *node)
119 #ifdef CONFIG_NUMA
120 extern void node_dev_init(void);
121 /* Core of the node registration - only memory
122 extern int __register_one_node(int nid);
123
124 /* Registers an online node */
125 static inline int register_one_node(int nid)
126 {
127 int error = 0;
128
129 if (node_online(nid)) {
130 struct pglist_data *pgdat = NO
131 unsigned long start_pfn = pgda
132 unsigned long end_pfn = start_
133
134 error = __register_one_node(ni
135 if (error)
136 return error;
137 register_memory_blocks_under_n
138
139 }
140
141 return error;
142 }
143
144 extern void unregister_one_node(int nid);
145 extern int register_cpu_under_node(unsigned in
146 extern int unregister_cpu_under_node(unsigned
147 extern void unregister_memory_block_under_node
148
149 extern int register_memory_node_under_compute_
150
151
152 #else
153 static inline void node_dev_init(void)
154 {
155 }
156 static inline int __register_one_node(int nid)
157 {
158 return 0;
159 }
160 static inline int register_one_node(int nid)
161 {
162 return 0;
163 }
164 static inline int unregister_one_node(int nid)
165 {
166 return 0;
167 }
168 static inline int register_cpu_under_node(unsi
169 {
170 return 0;
171 }
172 static inline int unregister_cpu_under_node(un
173 {
174 return 0;
175 }
176 static inline void unregister_memory_block_und
177 {
178 }
179 #endif
180
181 #define to_node(device) container_of(device, s
182
183 #endif /* _LINUX_NODE_H_ */
184
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.