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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
52 int 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                                 | sd_balance_for_mc_power()\
129                                 | sd_power_saving_flags(),\
130         .last_balance           = jiffies,              \
131         .balance_interval       = 1,                    \
132 }
133 #endif
134 #endif /* CONFIG_SCHED_MC */
135
136 /* Common values for CPUs */
137 #ifndef SD_CPU_INIT
138 #define SD_CPU_INIT (struct sched_domain) {             \
139         .min_interval           = 1,                    \
140         .max_interval           = 4,                    \
141         .busy_factor            = 64,                   \
142         .imbalance_pct          = 125,                  \
143         .cache_nice_tries       = 1,                    \
144         .busy_idx               = 2,                    \
145         .idle_idx               = 1,                    \
146         .newidle_idx            = 2,                    \
147         .wake_idx               = 1,                    \
148         .forkexec_idx           = 1,                    \
149         .flags                  = SD_LOAD_BALANCE       \
150                                 | SD_BALANCE_EXEC       \
151                                 | SD_BALANCE_FORK       \
152                                 | SD_WAKE_AFFINE        \
153                                 | SD_WAKE_BALANCE       \
154                                 | sd_balance_for_package_power()\
155                                 | sd_power_saving_flags(),\
156         .last_balance           = jiffies,              \
157         .balance_interval       = 1,                    \
158 }
159 #endif
160
161 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
162 #define SD_ALLNODES_INIT (struct sched_domain) {        \
163         .min_interval           = 64,                   \
164         .max_interval           = 64*num_online_cpus(), \
165         .busy_factor            = 128,                  \
166         .imbalance_pct          = 133,                  \
167         .cache_nice_tries       = 1,                    \
168         .busy_idx               = 3,                    \
169         .idle_idx               = 3,                    \
170         .flags                  = SD_LOAD_BALANCE       \
171                                 | SD_BALANCE_NEWIDLE    \
172                                 | SD_WAKE_AFFINE        \
173                                 | SD_SERIALIZE,         \
174         .last_balance           = jiffies,              \
175         .balance_interval       = 64,                   \
176 }
177
178 #ifdef CONFIG_NUMA
179 #ifndef SD_NODE_INIT
180 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
181 #endif
182 #endif /* CONFIG_NUMA */
183
184 #ifndef topology_physical_package_id
185 #define topology_physical_package_id(cpu)       ((void)(cpu), -1)
186 #endif
187 #ifndef topology_core_id
188 #define topology_core_id(cpu)                   ((void)(cpu), 0)
189 #endif
190 #ifndef topology_thread_siblings
191 #define topology_thread_siblings(cpu)           cpumask_of_cpu(cpu)
192 #endif
193 #ifndef topology_core_siblings
194 #define topology_core_siblings(cpu)             cpumask_of_cpu(cpu)
195 #endif
196
197 #endif /* _LINUX_TOPOLOGY_H */