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1da177e4 LT |
1 | /* |
2 | * include/linux/topology.h | |
3 | * | |
4 | * Written by: Matthew Dobson, IBM Corporation | |
5 | * | |
6 | * Copyright (C) 2002, IBM Corp. | |
7 | * | |
32525d02 | 8 | * All rights reserved. |
1da177e4 LT |
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> | |
72812019 | 34 | #include <linux/percpu.h> |
1da177e4 LT |
35 | #include <asm/topology.h> |
36 | ||
37 | #ifndef node_has_online_mem | |
38 | #define node_has_online_mem(nid) (1) | |
39 | #endif | |
40 | ||
41 | #ifndef nr_cpus_node | |
a70f7302 | 42 | #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node)) |
1da177e4 LT |
43 | #endif |
44 | ||
7c16ec58 MT |
45 | #define for_each_node_with_cpus(node) \ |
46 | for_each_online_node(node) \ | |
1da177e4 LT |
47 | if (nr_cpus_node(node)) |
48 | ||
ee79d1bd | 49 | int arch_update_cpu_topology(void); |
22e52b07 | 50 | |
1da177e4 LT |
51 | /* Conform to ACPI 2.0 SLIT distance definitions */ |
52 | #define LOCAL_DISTANCE 10 | |
53 | #define REMOTE_DISTANCE 20 | |
f787a503 | 54 | #ifndef node_distance |
1da177e4 LT |
55 | #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) |
56 | #endif | |
9eeff239 CL |
57 | #ifndef RECLAIM_DISTANCE |
58 | /* | |
59 | * If the distance between nodes in a system is larger than RECLAIM_DISTANCE | |
60 | * (in whatever arch specific measurement units returned by node_distance()) | |
61 | * then switch on zone reclaim on boot. | |
62 | */ | |
32e45ff4 | 63 | #define RECLAIM_DISTANCE 30 |
9eeff239 | 64 | #endif |
1da177e4 LT |
65 | #ifndef PENALTY_FOR_NODE_WITH_CPUS |
66 | #define PENALTY_FOR_NODE_WITH_CPUS (1) | |
67 | #endif | |
68 | ||
72812019 LS |
69 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
70 | DECLARE_PER_CPU(int, numa_node); | |
71 | ||
72 | #ifndef numa_node_id | |
73 | /* Returns the number of the current Node. */ | |
74 | static inline int numa_node_id(void) | |
75 | { | |
dc322a99 | 76 | return raw_cpu_read(numa_node); |
72812019 LS |
77 | } |
78 | #endif | |
79 | ||
80 | #ifndef cpu_to_node | |
81 | static inline int cpu_to_node(int cpu) | |
82 | { | |
83 | return per_cpu(numa_node, cpu); | |
84 | } | |
85 | #endif | |
86 | ||
87 | #ifndef set_numa_node | |
88 | static inline void set_numa_node(int node) | |
89 | { | |
c6ae41e7 | 90 | this_cpu_write(numa_node, node); |
72812019 LS |
91 | } |
92 | #endif | |
93 | ||
94 | #ifndef set_cpu_numa_node | |
95 | static inline void set_cpu_numa_node(int cpu, int node) | |
96 | { | |
97 | per_cpu(numa_node, cpu) = node; | |
98 | } | |
99 | #endif | |
100 | ||
101 | #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ | |
102 | ||
103 | /* Returns the number of the current Node. */ | |
104 | #ifndef numa_node_id | |
105 | static inline int numa_node_id(void) | |
106 | { | |
107 | return cpu_to_node(raw_smp_processor_id()); | |
108 | } | |
109 | #endif | |
110 | ||
111 | #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ | |
112 | ||
7aac7898 LS |
113 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
114 | ||
115 | /* | |
116 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
117 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
118 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). | |
119 | */ | |
120 | DECLARE_PER_CPU(int, _numa_mem_); | |
121 | ||
122 | #ifndef set_numa_mem | |
123 | static inline void set_numa_mem(int node) | |
124 | { | |
c6ae41e7 | 125 | this_cpu_write(_numa_mem_, node); |
7aac7898 LS |
126 | } |
127 | #endif | |
128 | ||
129 | #ifndef numa_mem_id | |
130 | /* Returns the number of the nearest Node with memory */ | |
131 | static inline int numa_mem_id(void) | |
132 | { | |
dc322a99 | 133 | return raw_cpu_read(_numa_mem_); |
7aac7898 LS |
134 | } |
135 | #endif | |
136 | ||
137 | #ifndef cpu_to_mem | |
138 | static inline int cpu_to_mem(int cpu) | |
139 | { | |
140 | return per_cpu(_numa_mem_, cpu); | |
141 | } | |
142 | #endif | |
143 | ||
144 | #ifndef set_cpu_numa_mem | |
145 | static inline void set_cpu_numa_mem(int cpu, int node) | |
146 | { | |
147 | per_cpu(_numa_mem_, cpu) = node; | |
148 | } | |
149 | #endif | |
150 | ||
151 | #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ | |
152 | ||
7aac7898 LS |
153 | #ifndef numa_mem_id |
154 | /* Returns the number of the nearest Node with memory */ | |
155 | static inline int numa_mem_id(void) | |
156 | { | |
157 | return numa_node_id(); | |
158 | } | |
159 | #endif | |
160 | ||
161 | #ifndef cpu_to_mem | |
162 | static inline int cpu_to_mem(int cpu) | |
163 | { | |
164 | return cpu_to_node(cpu); | |
165 | } | |
166 | #endif | |
167 | ||
168 | #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ | |
169 | ||
c50cbb05 BH |
170 | #ifndef topology_physical_package_id |
171 | #define topology_physical_package_id(cpu) ((void)(cpu), -1) | |
172 | #endif | |
173 | #ifndef topology_core_id | |
174 | #define topology_core_id(cpu) ((void)(cpu), 0) | |
175 | #endif | |
fbd59a8d RR |
176 | #ifndef topology_thread_cpumask |
177 | #define topology_thread_cpumask(cpu) cpumask_of(cpu) | |
178 | #endif | |
179 | #ifndef topology_core_cpumask | |
180 | #define topology_core_cpumask(cpu) cpumask_of(cpu) | |
181 | #endif | |
c50cbb05 | 182 | |
143e1e28 VG |
183 | #ifdef CONFIG_SCHED_SMT |
184 | static inline const struct cpumask *cpu_smt_mask(int cpu) | |
185 | { | |
186 | return topology_thread_cpumask(cpu); | |
187 | } | |
188 | #endif | |
189 | ||
190 | static inline const struct cpumask *cpu_cpu_mask(int cpu) | |
191 | { | |
192 | return cpumask_of_node(cpu_to_node(cpu)); | |
193 | } | |
194 | ||
195 | ||
1da177e4 | 196 | #endif /* _LINUX_TOPOLOGY_H */ |