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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 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
49int 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 * then switch on zone reclaim on boot.
62 */
63#define RECLAIM_DISTANCE 30
64#endif
65#ifndef PENALTY_FOR_NODE_WITH_CPUS
66#define PENALTY_FOR_NODE_WITH_CPUS (1)
67#endif
68
69/*
70 * Below are the 3 major initializers used in building sched_domains:
71 * SD_SIBLING_INIT, for SMT domains
72 * SD_CPU_INIT, for SMP domains
73 *
74 * Any architecture that cares to do any tuning to these values should do so
75 * by defining their own arch-specific initializer in include/asm/topology.h.
76 * A definition there will automagically override these default initializers
77 * and allow arch-specific performance tuning of sched_domains.
78 * (Only non-zero and non-null fields need be specified.)
79 */
80
81#ifdef CONFIG_SCHED_SMT
82/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
83 * so can't we drop this in favor of CONFIG_SCHED_SMT?
84 */
85#define ARCH_HAS_SCHED_WAKE_IDLE
86/* Common values for SMT siblings */
87#ifndef SD_SIBLING_INIT
88#define SD_SIBLING_INIT (struct sched_domain) { \
89 .min_interval = 1, \
90 .max_interval = 2, \
91 .busy_factor = 64, \
92 .imbalance_pct = 110, \
93 \
94 .flags = 1*SD_LOAD_BALANCE \
95 | 1*SD_BALANCE_NEWIDLE \
96 | 1*SD_BALANCE_EXEC \
97 | 1*SD_BALANCE_FORK \
98 | 0*SD_BALANCE_WAKE \
99 | 1*SD_WAKE_AFFINE \
100 | 1*SD_SHARE_CPUPOWER \
101 | 1*SD_SHARE_PKG_RESOURCES \
102 | 0*SD_SERIALIZE \
103 | 0*SD_PREFER_SIBLING \
104 | arch_sd_sibling_asym_packing() \
105 , \
106 .last_balance = jiffies, \
107 .balance_interval = 1, \
108 .smt_gain = 1178, /* 15% */ \
109}
110#endif
111#endif /* CONFIG_SCHED_SMT */
112
113#ifdef CONFIG_SCHED_MC
114/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
115#ifndef SD_MC_INIT
116#define SD_MC_INIT (struct sched_domain) { \
117 .min_interval = 1, \
118 .max_interval = 4, \
119 .busy_factor = 64, \
120 .imbalance_pct = 125, \
121 .cache_nice_tries = 1, \
122 .busy_idx = 2, \
123 .wake_idx = 0, \
124 .forkexec_idx = 0, \
125 \
126 .flags = 1*SD_LOAD_BALANCE \
127 | 1*SD_BALANCE_NEWIDLE \
128 | 1*SD_BALANCE_EXEC \
129 | 1*SD_BALANCE_FORK \
130 | 0*SD_BALANCE_WAKE \
131 | 1*SD_WAKE_AFFINE \
132 | 0*SD_PREFER_LOCAL \
133 | 0*SD_SHARE_CPUPOWER \
134 | 1*SD_SHARE_PKG_RESOURCES \
135 | 0*SD_SERIALIZE \
136 , \
137 .last_balance = jiffies, \
138 .balance_interval = 1, \
139}
140#endif
141#endif /* CONFIG_SCHED_MC */
142
143/* Common values for CPUs */
144#ifndef SD_CPU_INIT
145#define SD_CPU_INIT (struct sched_domain) { \
146 .min_interval = 1, \
147 .max_interval = 4, \
148 .busy_factor = 64, \
149 .imbalance_pct = 125, \
150 .cache_nice_tries = 1, \
151 .busy_idx = 2, \
152 .idle_idx = 1, \
153 .newidle_idx = 0, \
154 .wake_idx = 0, \
155 .forkexec_idx = 0, \
156 \
157 .flags = 1*SD_LOAD_BALANCE \
158 | 1*SD_BALANCE_NEWIDLE \
159 | 1*SD_BALANCE_EXEC \
160 | 1*SD_BALANCE_FORK \
161 | 0*SD_BALANCE_WAKE \
162 | 1*SD_WAKE_AFFINE \
163 | 0*SD_PREFER_LOCAL \
164 | 0*SD_SHARE_CPUPOWER \
165 | 0*SD_SHARE_PKG_RESOURCES \
166 | 0*SD_SERIALIZE \
167 , \
168 .last_balance = jiffies, \
169 .balance_interval = 1, \
170}
171#endif
172
173#ifdef CONFIG_SCHED_BOOK
174#ifndef SD_BOOK_INIT
175#error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
176#endif
177#endif /* CONFIG_SCHED_BOOK */
178
179#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
180DECLARE_PER_CPU(int, numa_node);
181
182#ifndef numa_node_id
183/* Returns the number of the current Node. */
184static inline int numa_node_id(void)
185{
186 return __this_cpu_read(numa_node);
187}
188#endif
189
190#ifndef cpu_to_node
191static inline int cpu_to_node(int cpu)
192{
193 return per_cpu(numa_node, cpu);
194}
195#endif
196
197#ifndef set_numa_node
198static inline void set_numa_node(int node)
199{
200 this_cpu_write(numa_node, node);
201}
202#endif
203
204#ifndef set_cpu_numa_node
205static inline void set_cpu_numa_node(int cpu, int node)
206{
207 per_cpu(numa_node, cpu) = node;
208}
209#endif
210
211#else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
212
213/* Returns the number of the current Node. */
214#ifndef numa_node_id
215static inline int numa_node_id(void)
216{
217 return cpu_to_node(raw_smp_processor_id());
218}
219#endif
220
221#endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
222
223#ifdef CONFIG_HAVE_MEMORYLESS_NODES
224
225/*
226 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
227 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
228 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
229 */
230DECLARE_PER_CPU(int, _numa_mem_);
231
232#ifndef set_numa_mem
233static inline void set_numa_mem(int node)
234{
235 this_cpu_write(_numa_mem_, node);
236}
237#endif
238
239#ifndef numa_mem_id
240/* Returns the number of the nearest Node with memory */
241static inline int numa_mem_id(void)
242{
243 return __this_cpu_read(_numa_mem_);
244}
245#endif
246
247#ifndef cpu_to_mem
248static inline int cpu_to_mem(int cpu)
249{
250 return per_cpu(_numa_mem_, cpu);
251}
252#endif
253
254#ifndef set_cpu_numa_mem
255static inline void set_cpu_numa_mem(int cpu, int node)
256{
257 per_cpu(_numa_mem_, cpu) = node;
258}
259#endif
260
261#else /* !CONFIG_HAVE_MEMORYLESS_NODES */
262
263#ifndef numa_mem_id
264/* Returns the number of the nearest Node with memory */
265static inline int numa_mem_id(void)
266{
267 return numa_node_id();
268}
269#endif
270
271#ifndef cpu_to_mem
272static inline int cpu_to_mem(int cpu)
273{
274 return cpu_to_node(cpu);
275}
276#endif
277
278#endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
279
280#ifndef topology_physical_package_id
281#define topology_physical_package_id(cpu) ((void)(cpu), -1)
282#endif
283#ifndef topology_core_id
284#define topology_core_id(cpu) ((void)(cpu), 0)
285#endif
286#ifndef topology_thread_cpumask
287#define topology_thread_cpumask(cpu) cpumask_of(cpu)
288#endif
289#ifndef topology_core_cpumask
290#define topology_core_cpumask(cpu) cpumask_of(cpu)
291#endif
292
293#endif /* _LINUX_TOPOLOGY_H */