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 node_has_online_mem 38 #define node_has_online_mem(nid) (1) 39 #endif 40 41 #ifndef nr_cpus_node 42 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node)) 43 #endif 44 45 #define for_each_node_with_cpus(node) \ 46 for_each_online_node(node) \ 47 if (nr_cpus_node(node)) 48 49 int arch_update_cpu_topology(void); 50 51 /* Conform to ACPI 2.0 SLIT distance definitions */ 52 #define LOCAL_DISTANCE 10 53 #define REMOTE_DISTANCE 20 54 #ifndef node_distance 55 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) 56 #endif 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 * and zone_reclaim_mode is enabled then the VM will only call zone_reclaim() 62 * on nodes within this distance. 63 */ 64 #define RECLAIM_DISTANCE 30 65 #endif 66 #ifndef PENALTY_FOR_NODE_WITH_CPUS 67 #define PENALTY_FOR_NODE_WITH_CPUS (1) 68 #endif 69 70 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID 71 DECLARE_PER_CPU(int, numa_node); 72 73 #ifndef numa_node_id 74 /* Returns the number of the current Node. */ 75 static inline int numa_node_id(void) 76 { 77 return raw_cpu_read(numa_node); 78 } 79 #endif 80 81 #ifndef cpu_to_node 82 static inline int cpu_to_node(int cpu) 83 { 84 return per_cpu(numa_node, cpu); 85 } 86 #endif 87 88 #ifndef set_numa_node 89 static inline void set_numa_node(int node) 90 { 91 this_cpu_write(numa_node, node); 92 } 93 #endif 94 95 #ifndef set_cpu_numa_node 96 static inline void set_cpu_numa_node(int cpu, int node) 97 { 98 per_cpu(numa_node, cpu) = node; 99 } 100 #endif 101 102 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ 103 104 /* Returns the number of the current Node. */ 105 #ifndef numa_node_id 106 static inline int numa_node_id(void) 107 { 108 return cpu_to_node(raw_smp_processor_id()); 109 } 110 #endif 111 112 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ 113 114 #ifdef CONFIG_HAVE_MEMORYLESS_NODES 115 116 /* 117 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. 118 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. 119 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). 120 */ 121 DECLARE_PER_CPU(int, _numa_mem_); 122 extern int _node_numa_mem_[MAX_NUMNODES]; 123 124 #ifndef set_numa_mem 125 static inline void set_numa_mem(int node) 126 { 127 this_cpu_write(_numa_mem_, node); 128 _node_numa_mem_[numa_node_id()] = node; 129 } 130 #endif 131 132 #ifndef node_to_mem_node 133 static inline int node_to_mem_node(int node) 134 { 135 return _node_numa_mem_[node]; 136 } 137 #endif 138 139 #ifndef numa_mem_id 140 /* Returns the number of the nearest Node with memory */ 141 static inline int numa_mem_id(void) 142 { 143 return raw_cpu_read(_numa_mem_); 144 } 145 #endif 146 147 #ifndef cpu_to_mem 148 static inline int cpu_to_mem(int cpu) 149 { 150 return per_cpu(_numa_mem_, cpu); 151 } 152 #endif 153 154 #ifndef set_cpu_numa_mem 155 static inline void set_cpu_numa_mem(int cpu, int node) 156 { 157 per_cpu(_numa_mem_, cpu) = node; 158 _node_numa_mem_[cpu_to_node(cpu)] = node; 159 } 160 #endif 161 162 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ 163 164 #ifndef numa_mem_id 165 /* Returns the number of the nearest Node with memory */ 166 static inline int numa_mem_id(void) 167 { 168 return numa_node_id(); 169 } 170 #endif 171 172 #ifndef node_to_mem_node 173 static inline int node_to_mem_node(int node) 174 { 175 return node; 176 } 177 #endif 178 179 #ifndef cpu_to_mem 180 static inline int cpu_to_mem(int cpu) 181 { 182 return cpu_to_node(cpu); 183 } 184 #endif 185 186 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ 187 188 #ifndef topology_physical_package_id 189 #define topology_physical_package_id(cpu) ((void)(cpu), -1) 190 #endif 191 #ifndef topology_core_id 192 #define topology_core_id(cpu) ((void)(cpu), 0) 193 #endif 194 #ifndef topology_thread_cpumask 195 #define topology_thread_cpumask(cpu) cpumask_of(cpu) 196 #endif 197 #ifndef topology_core_cpumask 198 #define topology_core_cpumask(cpu) cpumask_of(cpu) 199 #endif 200 201 #ifdef CONFIG_SCHED_SMT 202 static inline const struct cpumask *cpu_smt_mask(int cpu) 203 { 204 return topology_thread_cpumask(cpu); 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 } 212 213 214 #endif /* _LINUX_TOPOLOGY_H */ 215