1 /*
2 * include/linux/topology.h
3 *
4 * Written by: Matthew Dobson, IBM Corporation
5 *
6 * Copyright (C) 2002, IBM Corp.
7 *
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT. See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * Send feedback to <colpatch@us.ibm.com>
26 */
27 #ifndef _LINUX_TOPOLOGY_H
28 #define _LINUX_TOPOLOGY_H
29
30 #include <linux/cpumask.h>
31 #include <linux/bitops.h>
32 #include <linux/mmzone.h>
33 #include <linux/smp.h>
34 #include <linux/percpu.h>
35 #include <asm/topology.h>
36
37 #ifndef nr_cpus_node
38 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
39 #endif
40
41 #define for_each_node_with_cpus(node) \
42 for_each_online_node(node) \
43 if (nr_cpus_node(node))
44
45 int arch_update_cpu_topology(void);
46
47 /* Conform to ACPI 2.0 SLIT distance definitions */
48 #define LOCAL_DISTANCE 10
49 #define REMOTE_DISTANCE 20
50 #ifndef node_distance
51 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
52 #endif
53 #ifndef RECLAIM_DISTANCE
54 /*
55 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
56 * (in whatever arch specific measurement units returned by node_distance())
57 * and node_reclaim_mode is enabled then the VM will only call node_reclaim()
58 * on nodes within this distance.
59 */
60 #define RECLAIM_DISTANCE 30
61 #endif
62 #ifndef PENALTY_FOR_NODE_WITH_CPUS
63 #define PENALTY_FOR_NODE_WITH_CPUS (1)
64 #endif
65
66 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
67 DECLARE_PER_CPU(int, numa_node);
68
69 #ifndef numa_node_id
70 /* Returns the number of the current Node. */
numa_node_id(void)71 static inline int numa_node_id(void)
72 {
73 return raw_cpu_read(numa_node);
74 }
75 #endif
76
77 #ifndef cpu_to_node
cpu_to_node(int cpu)78 static inline int cpu_to_node(int cpu)
79 {
80 return per_cpu(numa_node, cpu);
81 }
82 #endif
83
84 #ifndef set_numa_node
set_numa_node(int node)85 static inline void set_numa_node(int node)
86 {
87 this_cpu_write(numa_node, node);
88 }
89 #endif
90
91 #ifndef set_cpu_numa_node
set_cpu_numa_node(int cpu,int node)92 static inline void set_cpu_numa_node(int cpu, int node)
93 {
94 per_cpu(numa_node, cpu) = node;
95 }
96 #endif
97
98 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
99
100 /* Returns the number of the current Node. */
101 #ifndef numa_node_id
numa_node_id(void)102 static inline int numa_node_id(void)
103 {
104 return cpu_to_node(raw_smp_processor_id());
105 }
106 #endif
107
108 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
109
110 #ifdef CONFIG_HAVE_MEMORYLESS_NODES
111
112 /*
113 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
114 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
115 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
116 */
117 DECLARE_PER_CPU(int, _numa_mem_);
118 extern int _node_numa_mem_[MAX_NUMNODES];
119
120 #ifndef set_numa_mem
set_numa_mem(int node)121 static inline void set_numa_mem(int node)
122 {
123 this_cpu_write(_numa_mem_, node);
124 _node_numa_mem_[numa_node_id()] = node;
125 }
126 #endif
127
128 #ifndef node_to_mem_node
node_to_mem_node(int node)129 static inline int node_to_mem_node(int node)
130 {
131 return _node_numa_mem_[node];
132 }
133 #endif
134
135 #ifndef numa_mem_id
136 /* Returns the number of the nearest Node with memory */
numa_mem_id(void)137 static inline int numa_mem_id(void)
138 {
139 return raw_cpu_read(_numa_mem_);
140 }
141 #endif
142
143 #ifndef cpu_to_mem
cpu_to_mem(int cpu)144 static inline int cpu_to_mem(int cpu)
145 {
146 return per_cpu(_numa_mem_, cpu);
147 }
148 #endif
149
150 #ifndef set_cpu_numa_mem
set_cpu_numa_mem(int cpu,int node)151 static inline void set_cpu_numa_mem(int cpu, int node)
152 {
153 per_cpu(_numa_mem_, cpu) = node;
154 _node_numa_mem_[cpu_to_node(cpu)] = node;
155 }
156 #endif
157
158 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */
159
160 #ifndef numa_mem_id
161 /* Returns the number of the nearest Node with memory */
numa_mem_id(void)162 static inline int numa_mem_id(void)
163 {
164 return numa_node_id();
165 }
166 #endif
167
168 #ifndef node_to_mem_node
node_to_mem_node(int node)169 static inline int node_to_mem_node(int node)
170 {
171 return node;
172 }
173 #endif
174
175 #ifndef cpu_to_mem
cpu_to_mem(int cpu)176 static inline int cpu_to_mem(int cpu)
177 {
178 return cpu_to_node(cpu);
179 }
180 #endif
181
182 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
183
184 #ifndef topology_physical_package_id
185 #define topology_physical_package_id(cpu) ((void)(cpu), -1)
186 #endif
187 #ifndef topology_core_id
188 #define topology_core_id(cpu) ((void)(cpu), 0)
189 #endif
190 #ifndef topology_sibling_cpumask
191 #define topology_sibling_cpumask(cpu) cpumask_of(cpu)
192 #endif
193 #ifndef topology_core_cpumask
194 #define topology_core_cpumask(cpu) cpumask_of(cpu)
195 #endif
196
197 #ifdef CONFIG_SCHED_SMT
cpu_smt_mask(int cpu)198 static inline const struct cpumask *cpu_smt_mask(int cpu)
199 {
200 return topology_sibling_cpumask(cpu);
201 }
202 #endif
203
cpu_cpu_mask(int cpu)204 static inline const struct cpumask *cpu_cpu_mask(int cpu)
205 {
206 return cpumask_of_node(cpu_to_node(cpu));
207 }
208
209
210 #endif /* _LINUX_TOPOLOGY_H */
211
