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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/list.h>
21 #include <linux/workqueue.h>
22 
23 /**
24  * struct node_hmem_attrs - heterogeneous memory performance attributes
25  *
26  * @read_bandwidth:	Read bandwidth in MB/s
27  * @write_bandwidth:	Write bandwidth in MB/s
28  * @read_latency:	Read latency in nanoseconds
29  * @write_latency:	Write latency in nanoseconds
30  */
31 struct node_hmem_attrs {
32 	unsigned int read_bandwidth;
33 	unsigned int write_bandwidth;
34 	unsigned int read_latency;
35 	unsigned int write_latency;
36 };
37 
38 enum cache_indexing {
39 	NODE_CACHE_DIRECT_MAP,
40 	NODE_CACHE_INDEXED,
41 	NODE_CACHE_OTHER,
42 };
43 
44 enum cache_write_policy {
45 	NODE_CACHE_WRITE_BACK,
46 	NODE_CACHE_WRITE_THROUGH,
47 	NODE_CACHE_WRITE_OTHER,
48 };
49 
50 /**
51  * struct node_cache_attrs - system memory caching attributes
52  *
53  * @indexing:		The ways memory blocks may be placed in cache
54  * @write_policy:	Write back or write through policy
55  * @size:		Total size of cache in bytes
56  * @line_size:		Number of bytes fetched on a cache miss
57  * @level:		The cache hierarchy level
58  */
59 struct node_cache_attrs {
60 	enum cache_indexing indexing;
61 	enum cache_write_policy write_policy;
62 	u64 size;
63 	u16 line_size;
64 	u8 level;
65 };
66 
67 #ifdef CONFIG_HMEM_REPORTING
68 void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
69 void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
70 			 unsigned access);
71 #else
node_add_cache(unsigned int nid,struct node_cache_attrs * cache_attrs)72 static inline void node_add_cache(unsigned int nid,
73 				  struct node_cache_attrs *cache_attrs)
74 {
75 }
76 
node_set_perf_attrs(unsigned int nid,struct node_hmem_attrs * hmem_attrs,unsigned access)77 static inline void node_set_perf_attrs(unsigned int nid,
78 				       struct node_hmem_attrs *hmem_attrs,
79 				       unsigned access)
80 {
81 }
82 #endif
83 
84 struct node {
85 	struct device	dev;
86 	struct list_head access_list;
87 
88 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
89 	struct work_struct	node_work;
90 #endif
91 #ifdef CONFIG_HMEM_REPORTING
92 	struct list_head cache_attrs;
93 	struct device *cache_dev;
94 #endif
95 };
96 
97 struct memory_block;
98 extern struct node *node_devices[];
99 typedef  void (*node_registration_func_t)(struct node *);
100 
101 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
102 extern int link_mem_sections(int nid, unsigned long start_pfn,
103 			     unsigned long end_pfn);
104 #else
link_mem_sections(int nid,unsigned long start_pfn,unsigned long end_pfn)105 static inline int link_mem_sections(int nid, unsigned long start_pfn,
106 				    unsigned long end_pfn)
107 {
108 	return 0;
109 }
110 #endif
111 
112 extern void unregister_node(struct node *node);
113 #ifdef CONFIG_NUMA
114 /* Core of the node registration - only memory hotplug should use this */
115 extern int __register_one_node(int nid);
116 
117 /* Registers an online node */
register_one_node(int nid)118 static inline int register_one_node(int nid)
119 {
120 	int error = 0;
121 
122 	if (node_online(nid)) {
123 		struct pglist_data *pgdat = NODE_DATA(nid);
124 		unsigned long start_pfn = pgdat->node_start_pfn;
125 		unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
126 
127 		error = __register_one_node(nid);
128 		if (error)
129 			return error;
130 		/* link memory sections under this node */
131 		error = link_mem_sections(nid, start_pfn, end_pfn);
132 	}
133 
134 	return error;
135 }
136 
137 extern void unregister_one_node(int nid);
138 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
139 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
140 extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk);
141 
142 extern int register_memory_node_under_compute_node(unsigned int mem_nid,
143 						   unsigned int cpu_nid,
144 						   unsigned access);
145 
146 #ifdef CONFIG_HUGETLBFS
147 extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
148 					 node_registration_func_t unregister);
149 #endif
150 #else
__register_one_node(int nid)151 static inline int __register_one_node(int nid)
152 {
153 	return 0;
154 }
register_one_node(int nid)155 static inline int register_one_node(int nid)
156 {
157 	return 0;
158 }
unregister_one_node(int nid)159 static inline int unregister_one_node(int nid)
160 {
161 	return 0;
162 }
register_cpu_under_node(unsigned int cpu,unsigned int nid)163 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
164 {
165 	return 0;
166 }
unregister_cpu_under_node(unsigned int cpu,unsigned int nid)167 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
168 {
169 	return 0;
170 }
unregister_memory_block_under_nodes(struct memory_block * mem_blk)171 static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
172 {
173 }
174 
register_hugetlbfs_with_node(node_registration_func_t reg,node_registration_func_t unreg)175 static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
176 						node_registration_func_t unreg)
177 {
178 }
179 #endif
180 
181 #define to_node(device) container_of(device, struct node, dev)
182 
183 #endif /* _LINUX_NODE_H_ */
184