1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * include/linux/node.h - generic node definit 3 * include/linux/node.h - generic node definition
4 * 4 *
5 * This is mainly for topological representati 5 * This is mainly for topological representation. We define the
6 * basic 'struct node' here, which can be embe 6 * basic 'struct node' here, which can be embedded in per-arch
7 * definitions of processors. 7 * definitions of processors.
8 * 8 *
9 * Basic handling of the devices is done in dr 9 * Basic handling of the devices is done in drivers/base/node.c
10 * and system devices are handled in drivers/b 10 * and system devices are handled in drivers/base/sys.c.
11 * 11 *
12 * Nodes are exported via driverfs in the clas 12 * Nodes are exported via driverfs in the class/node/devices/
13 * directory. 13 * directory.
14 */ 14 */
15 #ifndef _LINUX_NODE_H_ 15 #ifndef _LINUX_NODE_H_
16 #define _LINUX_NODE_H_ 16 #define _LINUX_NODE_H_
17 17
18 #include <linux/device.h> 18 #include <linux/device.h>
>> 19 #include <linux/cpumask.h>
19 #include <linux/list.h> 20 #include <linux/list.h>
20 21
21 /** 22 /**
22 * struct access_coordinate - generic performa 23 * struct access_coordinate - generic performance coordinates container
23 * 24 *
24 * @read_bandwidth: Read bandwidth in MB/s 25 * @read_bandwidth: Read bandwidth in MB/s
25 * @write_bandwidth: Write bandwidth in MB/ 26 * @write_bandwidth: Write bandwidth in MB/s
26 * @read_latency: Read latency in nanose 27 * @read_latency: Read latency in nanoseconds
27 * @write_latency: Write latency in nanos 28 * @write_latency: Write latency in nanoseconds
28 */ 29 */
29 struct access_coordinate { 30 struct access_coordinate {
30 unsigned int read_bandwidth; 31 unsigned int read_bandwidth;
31 unsigned int write_bandwidth; 32 unsigned int write_bandwidth;
32 unsigned int read_latency; 33 unsigned int read_latency;
33 unsigned int write_latency; 34 unsigned int write_latency;
34 }; 35 };
35 36
36 /* 37 /*
37 * ACCESS_COORDINATE_LOCAL correlates to ACCES 38 * ACCESS_COORDINATE_LOCAL correlates to ACCESS CLASS 0
38 * - access_coordinate between target nod 39 * - access_coordinate between target node and nearest initiator node
39 * ACCESS_COORDINATE_CPU correlates to ACCESS 40 * ACCESS_COORDINATE_CPU correlates to ACCESS CLASS 1
40 * - access_coordinate between target nod 41 * - access_coordinate between target node and nearest CPU node
41 */ 42 */
42 enum access_coordinate_class { 43 enum access_coordinate_class {
43 ACCESS_COORDINATE_LOCAL, 44 ACCESS_COORDINATE_LOCAL,
44 ACCESS_COORDINATE_CPU, 45 ACCESS_COORDINATE_CPU,
45 ACCESS_COORDINATE_MAX 46 ACCESS_COORDINATE_MAX
46 }; 47 };
47 48
48 enum cache_indexing { 49 enum cache_indexing {
49 NODE_CACHE_DIRECT_MAP, 50 NODE_CACHE_DIRECT_MAP,
50 NODE_CACHE_INDEXED, 51 NODE_CACHE_INDEXED,
51 NODE_CACHE_OTHER, 52 NODE_CACHE_OTHER,
52 }; 53 };
53 54
54 enum cache_write_policy { 55 enum cache_write_policy {
55 NODE_CACHE_WRITE_BACK, 56 NODE_CACHE_WRITE_BACK,
56 NODE_CACHE_WRITE_THROUGH, 57 NODE_CACHE_WRITE_THROUGH,
57 NODE_CACHE_WRITE_OTHER, 58 NODE_CACHE_WRITE_OTHER,
58 }; 59 };
59 60
60 /** 61 /**
61 * struct node_cache_attrs - system memory cac 62 * struct node_cache_attrs - system memory caching attributes
62 * 63 *
63 * @indexing: The ways memory blocks 64 * @indexing: The ways memory blocks may be placed in cache
64 * @write_policy: Write back or write th 65 * @write_policy: Write back or write through policy
65 * @size: Total size of cache in 66 * @size: Total size of cache in bytes
66 * @line_size: Number of bytes fetche 67 * @line_size: Number of bytes fetched on a cache miss
67 * @level: The cache hierarchy le 68 * @level: The cache hierarchy level
68 */ 69 */
69 struct node_cache_attrs { 70 struct node_cache_attrs {
70 enum cache_indexing indexing; 71 enum cache_indexing indexing;
71 enum cache_write_policy write_policy; 72 enum cache_write_policy write_policy;
72 u64 size; 73 u64 size;
73 u16 line_size; 74 u16 line_size;
74 u8 level; 75 u8 level;
75 }; 76 };
76 77
77 #ifdef CONFIG_HMEM_REPORTING 78 #ifdef CONFIG_HMEM_REPORTING
78 void node_add_cache(unsigned int nid, struct n 79 void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
79 void node_set_perf_attrs(unsigned int nid, str 80 void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
80 enum access_coordinat 81 enum access_coordinate_class access);
81 #else 82 #else
82 static inline void node_add_cache(unsigned int 83 static inline void node_add_cache(unsigned int nid,
83 struct node_ 84 struct node_cache_attrs *cache_attrs)
84 { 85 {
85 } 86 }
86 87
87 static inline void node_set_perf_attrs(unsigne 88 static inline void node_set_perf_attrs(unsigned int nid,
88 struct 89 struct access_coordinate *coord,
89 enum ac 90 enum access_coordinate_class access)
90 { 91 {
91 } 92 }
92 #endif 93 #endif
93 94
94 struct node { 95 struct node {
95 struct device dev; 96 struct device dev;
96 struct list_head access_list; 97 struct list_head access_list;
97 #ifdef CONFIG_HMEM_REPORTING 98 #ifdef CONFIG_HMEM_REPORTING
98 struct list_head cache_attrs; 99 struct list_head cache_attrs;
99 struct device *cache_dev; 100 struct device *cache_dev;
100 #endif 101 #endif
101 }; 102 };
102 103
103 struct memory_block; 104 struct memory_block;
104 extern struct node *node_devices[]; 105 extern struct node *node_devices[];
105 106
106 #if defined(CONFIG_MEMORY_HOTPLUG) && defined( 107 #if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_NUMA)
107 void register_memory_blocks_under_node(int nid 108 void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
108 unsigne 109 unsigned long end_pfn,
109 enum me 110 enum meminit_context context);
110 #else 111 #else
111 static inline void register_memory_blocks_unde 112 static inline void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
112 113 unsigned long end_pfn,
113 114 enum meminit_context context)
114 { 115 {
115 } 116 }
116 #endif 117 #endif
117 118
118 extern void unregister_node(struct node *node) 119 extern void unregister_node(struct node *node);
119 #ifdef CONFIG_NUMA 120 #ifdef CONFIG_NUMA
120 extern void node_dev_init(void); 121 extern void node_dev_init(void);
121 /* Core of the node registration - only memory 122 /* Core of the node registration - only memory hotplug should use this */
122 extern int __register_one_node(int nid); 123 extern int __register_one_node(int nid);
123 124
124 /* Registers an online node */ 125 /* Registers an online node */
125 static inline int register_one_node(int nid) 126 static inline int register_one_node(int nid)
126 { 127 {
127 int error = 0; 128 int error = 0;
128 129
129 if (node_online(nid)) { 130 if (node_online(nid)) {
130 struct pglist_data *pgdat = NO 131 struct pglist_data *pgdat = NODE_DATA(nid);
131 unsigned long start_pfn = pgda 132 unsigned long start_pfn = pgdat->node_start_pfn;
132 unsigned long end_pfn = start_ 133 unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
133 134
134 error = __register_one_node(ni 135 error = __register_one_node(nid);
135 if (error) 136 if (error)
136 return error; 137 return error;
137 register_memory_blocks_under_n 138 register_memory_blocks_under_node(nid, start_pfn, end_pfn,
138 139 MEMINIT_EARLY);
139 } 140 }
140 141
141 return error; 142 return error;
142 } 143 }
143 144
144 extern void unregister_one_node(int nid); 145 extern void unregister_one_node(int nid);
145 extern int register_cpu_under_node(unsigned in 146 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
146 extern int unregister_cpu_under_node(unsigned 147 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
147 extern void unregister_memory_block_under_node 148 extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk);
148 149
149 extern int register_memory_node_under_compute_ 150 extern int register_memory_node_under_compute_node(unsigned int mem_nid,
150 151 unsigned int cpu_nid,
151 152 enum access_coordinate_class access);
152 #else 153 #else
153 static inline void node_dev_init(void) 154 static inline void node_dev_init(void)
154 { 155 {
155 } 156 }
156 static inline int __register_one_node(int nid) 157 static inline int __register_one_node(int nid)
157 { 158 {
158 return 0; 159 return 0;
159 } 160 }
160 static inline int register_one_node(int nid) 161 static inline int register_one_node(int nid)
161 { 162 {
162 return 0; 163 return 0;
163 } 164 }
164 static inline int unregister_one_node(int nid) 165 static inline int unregister_one_node(int nid)
165 { 166 {
166 return 0; 167 return 0;
167 } 168 }
168 static inline int register_cpu_under_node(unsi 169 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
169 { 170 {
170 return 0; 171 return 0;
171 } 172 }
172 static inline int unregister_cpu_under_node(un 173 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
173 { 174 {
174 return 0; 175 return 0;
175 } 176 }
176 static inline void unregister_memory_block_und 177 static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
177 { 178 {
178 } 179 }
179 #endif 180 #endif
180 181
181 #define to_node(device) container_of(device, s 182 #define to_node(device) container_of(device, struct node, dev)
182 183
183 #endif /* _LINUX_NODE_H_ */ 184 #endif /* _LINUX_NODE_H_ */
184 185
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