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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
45int 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
67DECLARE_PER_CPU(int, numa_node);
68
69#ifndef numa_node_id
70/* Returns the number of the current Node. */
71static inline int numa_node_id(void)
72{
73 return raw_cpu_read(numa_node);
74}
75#endif
76
77#ifndef cpu_to_node
78static inline int cpu_to_node(int cpu)
79{
80 return per_cpu(numa_node, cpu);
81}
82#endif
83
84#ifndef set_numa_node
85static 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
92static 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
102static 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 */
117DECLARE_PER_CPU(int, _numa_mem_);
118extern int _node_numa_mem_[MAX_NUMNODES];
119
120#ifndef set_numa_mem
121static 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
129static 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 */
137static inline int numa_mem_id(void)
138{
139 return raw_cpu_read(_numa_mem_);
140}
141#endif
142
143#ifndef cpu_to_mem
144static 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
151static 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 */
162static inline int numa_mem_id(void)
163{
164 return numa_node_id();
165}
166#endif
167
168#ifndef node_to_mem_node
169static inline int node_to_mem_node(int node)
170{
171 return node;
172}
173#endif
174
175#ifndef cpu_to_mem
176static 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
198static inline const struct cpumask *cpu_smt_mask(int cpu)
199{
200 return topology_sibling_cpumask(cpu);
201}
202#endif
203
204static 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 */