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TOMOYO Linux Cross Reference
Linux/include/linux/topology.h

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  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. */
 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
 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
 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
 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
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
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
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 */
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
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
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 */
162 static inline int numa_mem_id(void)
163 {
164         return numa_node_id();
165 }
166 #endif
167 
168 #ifndef node_to_mem_node
169 static inline int node_to_mem_node(int node)
170 {
171         return node;
172 }
173 #endif
174 
175 #ifndef cpu_to_mem
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
198 static inline const struct cpumask *cpu_smt_mask(int cpu)
199 {
200         return topology_sibling_cpumask(cpu);
201 }
202 #endif
203 
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 

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