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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 | ||
60c1b220 | 30 | #include <linux/arch_topology.h> |
1da177e4 LT |
31 | #include <linux/cpumask.h> |
32 | #include <linux/bitops.h> | |
33 | #include <linux/mmzone.h> | |
34 | #include <linux/smp.h> | |
72812019 | 35 | #include <linux/percpu.h> |
1da177e4 LT |
36 | #include <asm/topology.h> |
37 | ||
1da177e4 | 38 | #ifndef nr_cpus_node |
a70f7302 | 39 | #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node)) |
1da177e4 LT |
40 | #endif |
41 | ||
7c16ec58 MT |
42 | #define for_each_node_with_cpus(node) \ |
43 | for_each_online_node(node) \ | |
1da177e4 LT |
44 | if (nr_cpus_node(node)) |
45 | ||
ee79d1bd | 46 | int arch_update_cpu_topology(void); |
22e52b07 | 47 | |
1da177e4 LT |
48 | /* Conform to ACPI 2.0 SLIT distance definitions */ |
49 | #define LOCAL_DISTANCE 10 | |
50 | #define REMOTE_DISTANCE 20 | |
f787a503 | 51 | #ifndef node_distance |
1da177e4 LT |
52 | #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) |
53 | #endif | |
9eeff239 CL |
54 | #ifndef RECLAIM_DISTANCE |
55 | /* | |
56 | * If the distance between nodes in a system is larger than RECLAIM_DISTANCE | |
57 | * (in whatever arch specific measurement units returned by node_distance()) | |
a5f5f91d | 58 | * and node_reclaim_mode is enabled then the VM will only call node_reclaim() |
4f9b16a6 | 59 | * on nodes within this distance. |
9eeff239 | 60 | */ |
32e45ff4 | 61 | #define RECLAIM_DISTANCE 30 |
9eeff239 | 62 | #endif |
a55c7454 MF |
63 | |
64 | /* | |
65 | * The following tunable allows platforms to override the default node | |
66 | * reclaim distance (RECLAIM_DISTANCE) if remote memory accesses are | |
67 | * sufficiently fast that the default value actually hurts | |
68 | * performance. | |
69 | * | |
70 | * AMD EPYC machines use this because even though the 2-hop distance | |
71 | * is 32 (3.2x slower than a local memory access) performance actually | |
72 | * *improves* if allowed to reclaim memory and load balance tasks | |
73 | * between NUMA nodes 2-hops apart. | |
74 | */ | |
75 | extern int __read_mostly node_reclaim_distance; | |
76 | ||
1da177e4 LT |
77 | #ifndef PENALTY_FOR_NODE_WITH_CPUS |
78 | #define PENALTY_FOR_NODE_WITH_CPUS (1) | |
79 | #endif | |
80 | ||
72812019 LS |
81 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
82 | DECLARE_PER_CPU(int, numa_node); | |
83 | ||
84 | #ifndef numa_node_id | |
85 | /* Returns the number of the current Node. */ | |
86 | static inline int numa_node_id(void) | |
87 | { | |
dc322a99 | 88 | return raw_cpu_read(numa_node); |
72812019 LS |
89 | } |
90 | #endif | |
91 | ||
92 | #ifndef cpu_to_node | |
93 | static inline int cpu_to_node(int cpu) | |
94 | { | |
95 | return per_cpu(numa_node, cpu); | |
96 | } | |
97 | #endif | |
98 | ||
99 | #ifndef set_numa_node | |
100 | static inline void set_numa_node(int node) | |
101 | { | |
c6ae41e7 | 102 | this_cpu_write(numa_node, node); |
72812019 LS |
103 | } |
104 | #endif | |
105 | ||
106 | #ifndef set_cpu_numa_node | |
107 | static inline void set_cpu_numa_node(int cpu, int node) | |
108 | { | |
109 | per_cpu(numa_node, cpu) = node; | |
110 | } | |
111 | #endif | |
112 | ||
113 | #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ | |
114 | ||
115 | /* Returns the number of the current Node. */ | |
116 | #ifndef numa_node_id | |
117 | static inline int numa_node_id(void) | |
118 | { | |
119 | return cpu_to_node(raw_smp_processor_id()); | |
120 | } | |
121 | #endif | |
122 | ||
123 | #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ | |
124 | ||
7aac7898 LS |
125 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
126 | ||
127 | /* | |
128 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
129 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
130 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). | |
131 | */ | |
132 | DECLARE_PER_CPU(int, _numa_mem_); | |
133 | ||
134 | #ifndef set_numa_mem | |
135 | static inline void set_numa_mem(int node) | |
136 | { | |
c6ae41e7 | 137 | this_cpu_write(_numa_mem_, node); |
7aac7898 LS |
138 | } |
139 | #endif | |
140 | ||
141 | #ifndef numa_mem_id | |
142 | /* Returns the number of the nearest Node with memory */ | |
143 | static inline int numa_mem_id(void) | |
144 | { | |
dc322a99 | 145 | return raw_cpu_read(_numa_mem_); |
7aac7898 LS |
146 | } |
147 | #endif | |
148 | ||
149 | #ifndef cpu_to_mem | |
150 | static inline int cpu_to_mem(int cpu) | |
151 | { | |
152 | return per_cpu(_numa_mem_, cpu); | |
153 | } | |
154 | #endif | |
155 | ||
156 | #ifndef set_cpu_numa_mem | |
157 | static inline void set_cpu_numa_mem(int cpu, int node) | |
158 | { | |
159 | per_cpu(_numa_mem_, cpu) = node; | |
160 | } | |
161 | #endif | |
162 | ||
163 | #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ | |
164 | ||
7aac7898 LS |
165 | #ifndef numa_mem_id |
166 | /* Returns the number of the nearest Node with memory */ | |
167 | static inline int numa_mem_id(void) | |
168 | { | |
169 | return numa_node_id(); | |
170 | } | |
171 | #endif | |
172 | ||
173 | #ifndef cpu_to_mem | |
174 | static inline int cpu_to_mem(int cpu) | |
175 | { | |
176 | return cpu_to_node(cpu); | |
177 | } | |
178 | #endif | |
179 | ||
180 | #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ | |
181 | ||
c50cbb05 BH |
182 | #ifndef topology_physical_package_id |
183 | #define topology_physical_package_id(cpu) ((void)(cpu), -1) | |
184 | #endif | |
0e344d8c LB |
185 | #ifndef topology_die_id |
186 | #define topology_die_id(cpu) ((void)(cpu), -1) | |
187 | #endif | |
c50cbb05 BH |
188 | #ifndef topology_core_id |
189 | #define topology_core_id(cpu) ((void)(cpu), 0) | |
190 | #endif | |
06931e62 BG |
191 | #ifndef topology_sibling_cpumask |
192 | #define topology_sibling_cpumask(cpu) cpumask_of(cpu) | |
fbd59a8d RR |
193 | #endif |
194 | #ifndef topology_core_cpumask | |
195 | #define topology_core_cpumask(cpu) cpumask_of(cpu) | |
196 | #endif | |
2e4c54da LB |
197 | #ifndef topology_die_cpumask |
198 | #define topology_die_cpumask(cpu) cpumask_of(cpu) | |
199 | #endif | |
c50cbb05 | 200 | |
3babbe44 | 201 | #if defined(CONFIG_SCHED_SMT) && !defined(cpu_smt_mask) |
143e1e28 VG |
202 | static inline const struct cpumask *cpu_smt_mask(int cpu) |
203 | { | |
06931e62 | 204 | return topology_sibling_cpumask(cpu); |
143e1e28 VG |
205 | } |
206 | #endif | |
207 | ||
208 | static inline const struct cpumask *cpu_cpu_mask(int cpu) | |
209 | { | |
210 | return cpumask_of_node(cpu_to_node(cpu)); | |
211 | } | |
212 | ||
213 | ||
1da177e4 | 214 | #endif /* _LINUX_TOPOLOGY_H */ |