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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 zone_reclaim_mode is enabled then the VM will only call zone_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 */ |