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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 <asm/topology.h>
35
36#ifndef node_has_online_mem
37#define node_has_online_mem(nid) (1)
38#endif
39
40#ifndef nr_cpus_node
41#define nr_cpus_node(node) \
42 ({ \
43 node_to_cpumask_ptr(__tmp__, node); \
44 cpus_weight(*__tmp__); \
45 })
46#endif
47
48#define for_each_node_with_cpus(node) \
49 for_each_online_node(node) \
50 if (nr_cpus_node(node))
51
52void arch_update_cpu_topology(void);
53
54/* Conform to ACPI 2.0 SLIT distance definitions */
55#define LOCAL_DISTANCE 10
56#define REMOTE_DISTANCE 20
57#ifndef node_distance
58#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
59#endif
60#ifndef RECLAIM_DISTANCE
61/*
62 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
63 * (in whatever arch specific measurement units returned by node_distance())
64 * then switch on zone reclaim on boot.
65 */
66#define RECLAIM_DISTANCE 20
67#endif
68#ifndef PENALTY_FOR_NODE_WITH_CPUS
69#define PENALTY_FOR_NODE_WITH_CPUS (1)
70#endif
71
72/*
73 * Below are the 3 major initializers used in building sched_domains:
74 * SD_SIBLING_INIT, for SMT domains
75 * SD_CPU_INIT, for SMP domains
76 * SD_NODE_INIT, for NUMA domains
77 *
78 * Any architecture that cares to do any tuning to these values should do so
79 * by defining their own arch-specific initializer in include/asm/topology.h.
80 * A definition there will automagically override these default initializers
81 * and allow arch-specific performance tuning of sched_domains.
82 * (Only non-zero and non-null fields need be specified.)
83 */
84
85#ifdef CONFIG_SCHED_SMT
86/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
87 * so can't we drop this in favor of CONFIG_SCHED_SMT?
88 */
89#define ARCH_HAS_SCHED_WAKE_IDLE
90/* Common values for SMT siblings */
91#ifndef SD_SIBLING_INIT
92#define SD_SIBLING_INIT (struct sched_domain) { \
93 .min_interval = 1, \
94 .max_interval = 2, \
95 .busy_factor = 64, \
96 .imbalance_pct = 110, \
97 .flags = SD_LOAD_BALANCE \
98 | SD_BALANCE_NEWIDLE \
99 | SD_BALANCE_FORK \
100 | SD_BALANCE_EXEC \
101 | SD_WAKE_AFFINE \
102 | SD_WAKE_BALANCE \
103 | SD_SHARE_CPUPOWER, \
104 .last_balance = jiffies, \
105 .balance_interval = 1, \
106}
107#endif
108#endif /* CONFIG_SCHED_SMT */
109
110#ifdef CONFIG_SCHED_MC
111/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
112#ifndef SD_MC_INIT
113#define SD_MC_INIT (struct sched_domain) { \
114 .min_interval = 1, \
115 .max_interval = 4, \
116 .busy_factor = 64, \
117 .imbalance_pct = 125, \
118 .cache_nice_tries = 1, \
119 .busy_idx = 2, \
120 .wake_idx = 1, \
121 .forkexec_idx = 1, \
122 .flags = SD_LOAD_BALANCE \
123 | SD_BALANCE_FORK \
124 | SD_BALANCE_EXEC \
125 | SD_WAKE_AFFINE \
126 | SD_WAKE_BALANCE \
127 | SD_SHARE_PKG_RESOURCES\
128 | BALANCE_FOR_MC_POWER, \
129 .last_balance = jiffies, \
130 .balance_interval = 1, \
131}
132#endif
133#endif /* CONFIG_SCHED_MC */
134
135/* Common values for CPUs */
136#ifndef SD_CPU_INIT
137#define SD_CPU_INIT (struct sched_domain) { \
138 .min_interval = 1, \
139 .max_interval = 4, \
140 .busy_factor = 64, \
141 .imbalance_pct = 125, \
142 .cache_nice_tries = 1, \
143 .busy_idx = 2, \
144 .idle_idx = 1, \
145 .newidle_idx = 2, \
146 .wake_idx = 1, \
147 .forkexec_idx = 1, \
148 .flags = SD_LOAD_BALANCE \
149 | SD_BALANCE_EXEC \
150 | SD_BALANCE_FORK \
151 | SD_WAKE_AFFINE \
152 | SD_WAKE_BALANCE \
153 | BALANCE_FOR_PKG_POWER,\
154 .last_balance = jiffies, \
155 .balance_interval = 1, \
156}
157#endif
158
159/* sched_domains SD_ALLNODES_INIT for NUMA machines */
160#define SD_ALLNODES_INIT (struct sched_domain) { \
161 .min_interval = 64, \
162 .max_interval = 64*num_online_cpus(), \
163 .busy_factor = 128, \
164 .imbalance_pct = 133, \
165 .cache_nice_tries = 1, \
166 .busy_idx = 3, \
167 .idle_idx = 3, \
168 .flags = SD_LOAD_BALANCE \
169 | SD_BALANCE_NEWIDLE \
170 | SD_WAKE_AFFINE \
171 | SD_SERIALIZE, \
172 .last_balance = jiffies, \
173 .balance_interval = 64, \
174}
175
176#ifdef CONFIG_NUMA
177#ifndef SD_NODE_INIT
178#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
179#endif
180#endif /* CONFIG_NUMA */
181
182#ifndef topology_physical_package_id
183#define topology_physical_package_id(cpu) ((void)(cpu), -1)
184#endif
185#ifndef topology_core_id
186#define topology_core_id(cpu) ((void)(cpu), 0)
187#endif
188#ifndef topology_thread_siblings
189#define topology_thread_siblings(cpu) cpumask_of_cpu(cpu)
190#endif
191#ifndef topology_core_siblings
192#define topology_core_siblings(cpu) cpumask_of_cpu(cpu)
193#endif
194
195#endif /* _LINUX_TOPOLOGY_H */