1 /* SPDX-License-Identifier: GPL-2.0 */
3 * include/linux/node.h - generic node definition
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.
9 * Basic handling of the devices is done in drivers/base/node.c
10 * and system devices are handled in drivers/base/sys.c.
12 * Nodes are exported via driverfs in the class/node/devices/
15 #ifndef _LINUX_NODE_H_
16 #define _LINUX_NODE_H_
18 #include <linux/device.h>
19 #include <linux/cpumask.h>
20 #include <linux/list.h>
21 #include <linux/workqueue.h>
24 * struct node_hmem_attrs - heterogeneous memory performance attributes
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
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
;
39 NODE_CACHE_DIRECT_MAP
,
44 enum cache_write_policy
{
45 NODE_CACHE_WRITE_BACK
,
46 NODE_CACHE_WRITE_THROUGH
,
47 NODE_CACHE_WRITE_OTHER
,
51 * struct node_cache_attrs - system memory caching attributes
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
59 struct node_cache_attrs
{
60 enum cache_indexing indexing
;
61 enum cache_write_policy write_policy
;
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
,
72 static inline void node_add_cache(unsigned int nid
,
73 struct node_cache_attrs
*cache_attrs
)
77 static inline void node_set_perf_attrs(unsigned int nid
,
78 struct node_hmem_attrs
*hmem_attrs
,
86 struct list_head access_list
;
88 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
89 struct work_struct node_work
;
91 #ifdef CONFIG_HMEM_REPORTING
92 struct list_head cache_attrs
;
93 struct device
*cache_dev
;
98 extern struct node
*node_devices
[];
99 typedef void (*node_registration_func_t
)(struct node
*);
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
);
105 static inline int link_mem_sections(int nid
, unsigned long start_pfn
,
106 unsigned long end_pfn
)
112 extern void unregister_node(struct node
*node
);
114 /* Core of the node registration - only memory hotplug should use this */
115 extern int __register_one_node(int nid
);
117 /* Registers an online node */
118 static inline int register_one_node(int nid
)
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
;
127 error
= __register_one_node(nid
);
130 /* link memory sections under this node */
131 error
= link_mem_sections(nid
, start_pfn
, end_pfn
);
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
);
142 extern int register_memory_node_under_compute_node(unsigned int mem_nid
,
143 unsigned int cpu_nid
,
146 #ifdef CONFIG_HUGETLBFS
147 extern void register_hugetlbfs_with_node(node_registration_func_t doregister
,
148 node_registration_func_t unregister
);
151 static inline int __register_one_node(int nid
)
155 static inline int register_one_node(int nid
)
159 static inline int unregister_one_node(int nid
)
163 static inline int register_cpu_under_node(unsigned int cpu
, unsigned int nid
)
167 static inline int unregister_cpu_under_node(unsigned int cpu
, unsigned int nid
)
171 static inline void unregister_memory_block_under_nodes(struct memory_block
*mem_blk
)
175 static inline void register_hugetlbfs_with_node(node_registration_func_t reg
,
176 node_registration_func_t unreg
)
181 #define to_node(device) container_of(device, struct node, dev)
183 #endif /* _LINUX_NODE_H_ */