summaryrefslogtreecommitdiffstats
path: root/include/linux/node.h
blob: 014ba3ab2efd8b7b7b1dc58b0d9e9d63bf3d1e90 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * include/linux/node.h - generic node definition
 *
 * This is mainly for topological representation. We define the 
 * basic 'struct node' here, which can be embedded in per-arch 
 * definitions of processors.
 *
 * Basic handling of the devices is done in drivers/base/node.c
 * and system devices are handled in drivers/base/sys.c. 
 *
 * Nodes are exported via driverfs in the class/node/devices/
 * directory. 
 */
#ifndef _LINUX_NODE_H_
#define _LINUX_NODE_H_

#include <linux/device.h>
#include <linux/cpumask.h>
#include <linux/list.h>
#include <linux/workqueue.h>

/**
 * struct node_hmem_attrs - heterogeneous memory performance attributes
 *
 * @read_bandwidth:	Read bandwidth in MB/s
 * @write_bandwidth:	Write bandwidth in MB/s
 * @read_latency:	Read latency in nanoseconds
 * @write_latency:	Write latency in nanoseconds
 */
struct node_hmem_attrs {
	unsigned int read_bandwidth;
	unsigned int write_bandwidth;
	unsigned int read_latency;
	unsigned int write_latency;
};

enum cache_indexing {
	NODE_CACHE_DIRECT_MAP,
	NODE_CACHE_INDEXED,
	NODE_CACHE_OTHER,
};

enum cache_write_policy {
	NODE_CACHE_WRITE_BACK,
	NODE_CACHE_WRITE_THROUGH,
	NODE_CACHE_WRITE_OTHER,
};

/**
 * struct node_cache_attrs - system memory caching attributes
 *
 * @indexing:		The ways memory blocks may be placed in cache
 * @write_policy:	Write back or write through policy
 * @size:		Total size of cache in bytes
 * @line_size:		Number of bytes fetched on a cache miss
 * @level:		The cache hierarchy level
 */
struct node_cache_attrs {
	enum cache_indexing indexing;
	enum cache_write_policy write_policy;
	u64 size;
	u16 line_size;
	u8 level;
};

#ifdef CONFIG_HMEM_REPORTING
void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
			 unsigned access);
#else
static inline void node_add_cache(unsigned int nid,
				  struct node_cache_attrs *cache_attrs)
{
}

static inline void node_set_perf_attrs(unsigned int nid,
				       struct node_hmem_attrs *hmem_attrs,
				       unsigned access)
{
}
#endif

struct node {
	struct device	dev;
	struct list_head access_list;

#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
	struct work_struct	node_work;
#endif
#ifdef CONFIG_HMEM_REPORTING
	struct list_head cache_attrs;
	struct device *cache_dev;
#endif
};

struct memory_block;
extern struct node *node_devices[];
typedef  void (*node_registration_func_t)(struct node *);

#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
int link_mem_sections(int nid, unsigned long start_pfn,
		      unsigned long end_pfn,
		      enum meminit_context context);
#else
static inline int link_mem_sections(int nid, unsigned long start_pfn,
				    unsigned long end_pfn,
				    enum meminit_context context)
{
	return 0;
}
#endif

extern void unregister_node(struct node *node);
#ifdef CONFIG_NUMA
/* Core of the node registration - only memory hotplug should use this */
extern int __register_one_node(int nid);

/* Registers an online node */
static inline int register_one_node(int nid)
{
	int error = 0;

	if (node_online(nid)) {
		struct pglist_data *pgdat = NODE_DATA(nid);
		unsigned long start_pfn = pgdat->node_start_pfn;
		unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;

		error = __register_one_node(nid);
		if (error)
			return error;
		/* link memory sections under this node */
		error = link_mem_sections(nid, start_pfn, end_pfn,
					  MEMINIT_EARLY);
	}

	return error;
}

extern void unregister_one_node(int nid);
extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk);

extern int register_memory_node_under_compute_node(unsigned int mem_nid,
						   unsigned int cpu_nid,
						   unsigned access);

#ifdef CONFIG_HUGETLBFS
extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
					 node_registration_func_t unregister);
#endif
#else
static inline int __register_one_node(int nid)
{
	return 0;
}
static inline int register_one_node(int nid)
{
	return 0;
}
static inline int unregister_one_node(int nid)
{
	return 0;
}
static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	return 0;
}
static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
{
	return 0;
}
static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
{
}

static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
						node_registration_func_t unreg)
{
}
#endif

#define to_node(device) container_of(device, struct node, dev)

#endif /* _LINUX_NODE_H_ */