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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 * SD_NODE_INIT, for NUMA domains
74 *
75 * Any architecture that cares to do any tuning to these values should do so
76 * by defining their own arch-specific initializer in include/asm/topology.h.
77 * A definition there will automagically override these default initializers
78 * and allow arch-specific performance tuning of sched_domains.
79 * (Only non-zero and non-null fields need be specified.)
80 */
81
82#ifdef CONFIG_SCHED_SMT
83/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
84 * so can't we drop this in favor of CONFIG_SCHED_SMT?
85 */
86#define ARCH_HAS_SCHED_WAKE_IDLE
87/* Common values for SMT siblings */
88#ifndef SD_SIBLING_INIT
89#define SD_SIBLING_INIT (struct sched_domain) { \
90 .min_interval = 1, \
91 .max_interval = 2, \
92 .busy_factor = 64, \
93 .imbalance_pct = 110, \
94 \
95 .flags = 1*SD_LOAD_BALANCE \
96 | 1*SD_BALANCE_NEWIDLE \
97 | 1*SD_BALANCE_EXEC \
98 | 1*SD_BALANCE_FORK \
99 | 0*SD_BALANCE_WAKE \
100 | 1*SD_WAKE_AFFINE \
101 | 1*SD_SHARE_CPUPOWER \
102 | 0*SD_POWERSAVINGS_BALANCE \
103 | 1*SD_SHARE_PKG_RESOURCES \
104 | 0*SD_SERIALIZE \
105 | 0*SD_PREFER_SIBLING \
106 | arch_sd_sibling_asym_packing() \
107 , \
108 .last_balance = jiffies, \
109 .balance_interval = 1, \
110 .smt_gain = 1178, /* 15% */ \
111}
112#endif
113#endif /* CONFIG_SCHED_SMT */
114
115#ifdef CONFIG_SCHED_MC
116/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
117#ifndef SD_MC_INIT
118#define SD_MC_INIT (struct sched_domain) { \
119 .min_interval = 1, \
120 .max_interval = 4, \
121 .busy_factor = 64, \
122 .imbalance_pct = 125, \
123 .cache_nice_tries = 1, \
124 .busy_idx = 2, \
125 .wake_idx = 0, \
126 .forkexec_idx = 0, \
127 \
128 .flags = 1*SD_LOAD_BALANCE \
129 | 1*SD_BALANCE_NEWIDLE \
130 | 1*SD_BALANCE_EXEC \
131 | 1*SD_BALANCE_FORK \
132 | 0*SD_BALANCE_WAKE \
133 | 1*SD_WAKE_AFFINE \
134 | 0*SD_PREFER_LOCAL \
135 | 0*SD_SHARE_CPUPOWER \
136 | 1*SD_SHARE_PKG_RESOURCES \
137 | 0*SD_SERIALIZE \
138 | sd_balance_for_mc_power() \
139 | sd_power_saving_flags() \
140 , \
141 .last_balance = jiffies, \
142 .balance_interval = 1, \
143}
144#endif
145#endif /* CONFIG_SCHED_MC */
146
147/* Common values for CPUs */
148#ifndef SD_CPU_INIT
149#define SD_CPU_INIT (struct sched_domain) { \
150 .min_interval = 1, \
151 .max_interval = 4, \
152 .busy_factor = 64, \
153 .imbalance_pct = 125, \
154 .cache_nice_tries = 1, \
155 .busy_idx = 2, \
156 .idle_idx = 1, \
157 .newidle_idx = 0, \
158 .wake_idx = 0, \
159 .forkexec_idx = 0, \
160 \
161 .flags = 1*SD_LOAD_BALANCE \
162 | 1*SD_BALANCE_NEWIDLE \
163 | 1*SD_BALANCE_EXEC \
164 | 1*SD_BALANCE_FORK \
165 | 0*SD_BALANCE_WAKE \
166 | 1*SD_WAKE_AFFINE \
167 | 0*SD_PREFER_LOCAL \
168 | 0*SD_SHARE_CPUPOWER \
169 | 0*SD_SHARE_PKG_RESOURCES \
170 | 0*SD_SERIALIZE \
171 | sd_balance_for_package_power() \
172 | sd_power_saving_flags() \
173 , \
174 .last_balance = jiffies, \
175 .balance_interval = 1, \
176}
177#endif
178
179/* sched_domains SD_ALLNODES_INIT for NUMA machines */
180#define SD_ALLNODES_INIT (struct sched_domain) { \
181 .min_interval = 64, \
182 .max_interval = 64*num_online_cpus(), \
183 .busy_factor = 128, \
184 .imbalance_pct = 133, \
185 .cache_nice_tries = 1, \
186 .busy_idx = 3, \
187 .idle_idx = 3, \
188 .flags = 1*SD_LOAD_BALANCE \
189 | 1*SD_BALANCE_NEWIDLE \
190 | 0*SD_BALANCE_EXEC \
191 | 0*SD_BALANCE_FORK \
192 | 0*SD_BALANCE_WAKE \
193 | 0*SD_WAKE_AFFINE \
194 | 0*SD_SHARE_CPUPOWER \
195 | 0*SD_POWERSAVINGS_BALANCE \
196 | 0*SD_SHARE_PKG_RESOURCES \
197 | 1*SD_SERIALIZE \
198 | 0*SD_PREFER_SIBLING \
199 , \
200 .last_balance = jiffies, \
201 .balance_interval = 64, \
202}
203
204#ifdef CONFIG_SCHED_BOOK
205#ifndef SD_BOOK_INIT
206#error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
207#endif
208#endif /* CONFIG_SCHED_BOOK */
209
210#ifdef CONFIG_NUMA
211#ifndef SD_NODE_INIT
212#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
213#endif
214
215#endif /* CONFIG_NUMA */
216
217#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
218DECLARE_PER_CPU(int, numa_node);
219
220#ifndef numa_node_id
221/* Returns the number of the current Node. */
222static inline int numa_node_id(void)
223{
224 return __this_cpu_read(numa_node);
225}
226#endif
227
228#ifndef cpu_to_node
229static inline int cpu_to_node(int cpu)
230{
231 return per_cpu(numa_node, cpu);
232}
233#endif
234
235#ifndef set_numa_node
236static inline void set_numa_node(int node)
237{
238 percpu_write(numa_node, node);
239}
240#endif
241
242#ifndef set_cpu_numa_node
243static inline void set_cpu_numa_node(int cpu, int node)
244{
245 per_cpu(numa_node, cpu) = node;
246}
247#endif
248
249#else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
250
251/* Returns the number of the current Node. */
252#ifndef numa_node_id
253static inline int numa_node_id(void)
254{
255 return cpu_to_node(raw_smp_processor_id());
256}
257#endif
258
259#endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
260
261#ifdef CONFIG_HAVE_MEMORYLESS_NODES
262
263/*
264 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
265 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
266 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
267 */
268DECLARE_PER_CPU(int, _numa_mem_);
269
270#ifndef set_numa_mem
271static inline void set_numa_mem(int node)
272{
273 percpu_write(_numa_mem_, node);
274}
275#endif
276
277#ifndef numa_mem_id
278/* Returns the number of the nearest Node with memory */
279static inline int numa_mem_id(void)
280{
281 return __this_cpu_read(_numa_mem_);
282}
283#endif
284
285#ifndef cpu_to_mem
286static inline int cpu_to_mem(int cpu)
287{
288 return per_cpu(_numa_mem_, cpu);
289}
290#endif
291
292#ifndef set_cpu_numa_mem
293static inline void set_cpu_numa_mem(int cpu, int node)
294{
295 per_cpu(_numa_mem_, cpu) = node;
296}
297#endif
298
299#else /* !CONFIG_HAVE_MEMORYLESS_NODES */
300
301#ifndef numa_mem_id
302/* Returns the number of the nearest Node with memory */
303static inline int numa_mem_id(void)
304{
305 return numa_node_id();
306}
307#endif
308
309#ifndef cpu_to_mem
310static inline int cpu_to_mem(int cpu)
311{
312 return cpu_to_node(cpu);
313}
314#endif
315
316#endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
317
318#ifndef topology_physical_package_id
319#define topology_physical_package_id(cpu) ((void)(cpu), -1)
320#endif
321#ifndef topology_core_id
322#define topology_core_id(cpu) ((void)(cpu), 0)
323#endif
324#ifndef topology_thread_cpumask
325#define topology_thread_cpumask(cpu) cpumask_of(cpu)
326#endif
327#ifndef topology_core_cpumask
328#define topology_core_cpumask(cpu) cpumask_of(cpu)
329#endif
330
331#endif /* _LINUX_TOPOLOGY_H */