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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 | |
620a6dc4 | 51 | #define DISTANCE_BITS 8 |
f787a503 | 52 | #ifndef node_distance |
1da177e4 LT |
53 | #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) |
54 | #endif | |
9eeff239 CL |
55 | #ifndef RECLAIM_DISTANCE |
56 | /* | |
57 | * If the distance between nodes in a system is larger than RECLAIM_DISTANCE | |
58 | * (in whatever arch specific measurement units returned by node_distance()) | |
a5f5f91d | 59 | * and node_reclaim_mode is enabled then the VM will only call node_reclaim() |
4f9b16a6 | 60 | * on nodes within this distance. |
9eeff239 | 61 | */ |
32e45ff4 | 62 | #define RECLAIM_DISTANCE 30 |
9eeff239 | 63 | #endif |
a55c7454 MF |
64 | |
65 | /* | |
66 | * The following tunable allows platforms to override the default node | |
67 | * reclaim distance (RECLAIM_DISTANCE) if remote memory accesses are | |
68 | * sufficiently fast that the default value actually hurts | |
69 | * performance. | |
70 | * | |
71 | * AMD EPYC machines use this because even though the 2-hop distance | |
72 | * is 32 (3.2x slower than a local memory access) performance actually | |
73 | * *improves* if allowed to reclaim memory and load balance tasks | |
74 | * between NUMA nodes 2-hops apart. | |
75 | */ | |
76 | extern int __read_mostly node_reclaim_distance; | |
77 | ||
1da177e4 LT |
78 | #ifndef PENALTY_FOR_NODE_WITH_CPUS |
79 | #define PENALTY_FOR_NODE_WITH_CPUS (1) | |
80 | #endif | |
81 | ||
72812019 LS |
82 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
83 | DECLARE_PER_CPU(int, numa_node); | |
84 | ||
85 | #ifndef numa_node_id | |
86 | /* Returns the number of the current Node. */ | |
87 | static inline int numa_node_id(void) | |
88 | { | |
dc322a99 | 89 | return raw_cpu_read(numa_node); |
72812019 LS |
90 | } |
91 | #endif | |
92 | ||
93 | #ifndef cpu_to_node | |
94 | static inline int cpu_to_node(int cpu) | |
95 | { | |
96 | return per_cpu(numa_node, cpu); | |
97 | } | |
98 | #endif | |
99 | ||
100 | #ifndef set_numa_node | |
101 | static inline void set_numa_node(int node) | |
102 | { | |
c6ae41e7 | 103 | this_cpu_write(numa_node, node); |
72812019 LS |
104 | } |
105 | #endif | |
106 | ||
107 | #ifndef set_cpu_numa_node | |
108 | static inline void set_cpu_numa_node(int cpu, int node) | |
109 | { | |
110 | per_cpu(numa_node, cpu) = node; | |
111 | } | |
112 | #endif | |
113 | ||
114 | #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ | |
115 | ||
116 | /* Returns the number of the current Node. */ | |
117 | #ifndef numa_node_id | |
118 | static inline int numa_node_id(void) | |
119 | { | |
120 | return cpu_to_node(raw_smp_processor_id()); | |
121 | } | |
122 | #endif | |
123 | ||
124 | #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ | |
125 | ||
7aac7898 LS |
126 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
127 | ||
128 | /* | |
129 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
130 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
131 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). | |
132 | */ | |
133 | DECLARE_PER_CPU(int, _numa_mem_); | |
134 | ||
135 | #ifndef set_numa_mem | |
136 | static inline void set_numa_mem(int node) | |
137 | { | |
c6ae41e7 | 138 | this_cpu_write(_numa_mem_, node); |
7aac7898 LS |
139 | } |
140 | #endif | |
141 | ||
142 | #ifndef numa_mem_id | |
143 | /* Returns the number of the nearest Node with memory */ | |
144 | static inline int numa_mem_id(void) | |
145 | { | |
dc322a99 | 146 | return raw_cpu_read(_numa_mem_); |
7aac7898 LS |
147 | } |
148 | #endif | |
149 | ||
150 | #ifndef cpu_to_mem | |
151 | static inline int cpu_to_mem(int cpu) | |
152 | { | |
153 | return per_cpu(_numa_mem_, cpu); | |
154 | } | |
155 | #endif | |
156 | ||
157 | #ifndef set_cpu_numa_mem | |
158 | static inline void set_cpu_numa_mem(int cpu, int node) | |
159 | { | |
160 | per_cpu(_numa_mem_, cpu) = node; | |
161 | } | |
162 | #endif | |
163 | ||
164 | #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ | |
165 | ||
7aac7898 LS |
166 | #ifndef numa_mem_id |
167 | /* Returns the number of the nearest Node with memory */ | |
168 | static inline int numa_mem_id(void) | |
169 | { | |
170 | return numa_node_id(); | |
171 | } | |
172 | #endif | |
173 | ||
174 | #ifndef cpu_to_mem | |
175 | static inline int cpu_to_mem(int cpu) | |
176 | { | |
177 | return cpu_to_node(cpu); | |
178 | } | |
179 | #endif | |
180 | ||
181 | #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ | |
182 | ||
c50cbb05 BH |
183 | #ifndef topology_physical_package_id |
184 | #define topology_physical_package_id(cpu) ((void)(cpu), -1) | |
185 | #endif | |
0e344d8c LB |
186 | #ifndef topology_die_id |
187 | #define topology_die_id(cpu) ((void)(cpu), -1) | |
188 | #endif | |
c50cbb05 BH |
189 | #ifndef topology_core_id |
190 | #define topology_core_id(cpu) ((void)(cpu), 0) | |
191 | #endif | |
06931e62 BG |
192 | #ifndef topology_sibling_cpumask |
193 | #define topology_sibling_cpumask(cpu) cpumask_of(cpu) | |
fbd59a8d RR |
194 | #endif |
195 | #ifndef topology_core_cpumask | |
196 | #define topology_core_cpumask(cpu) cpumask_of(cpu) | |
197 | #endif | |
2e4c54da LB |
198 | #ifndef topology_die_cpumask |
199 | #define topology_die_cpumask(cpu) cpumask_of(cpu) | |
200 | #endif | |
c50cbb05 | 201 | |
3babbe44 | 202 | #if defined(CONFIG_SCHED_SMT) && !defined(cpu_smt_mask) |
143e1e28 VG |
203 | static inline const struct cpumask *cpu_smt_mask(int cpu) |
204 | { | |
06931e62 | 205 | return topology_sibling_cpumask(cpu); |
143e1e28 VG |
206 | } |
207 | #endif | |
208 | ||
209 | static inline const struct cpumask *cpu_cpu_mask(int cpu) | |
210 | { | |
211 | return cpumask_of_node(cpu_to_node(cpu)); | |
212 | } | |
213 | ||
214 | ||
1da177e4 | 215 | #endif /* _LINUX_TOPOLOGY_H */ |