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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/include/asm-i386/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 _ASM_I386_TOPOLOGY_H
28#define _ASM_I386_TOPOLOGY_H
29
30#ifdef CONFIG_NUMA
31
32#include <asm/mpspec.h>
33
34#include <linux/cpumask.h>
35
36/* Mappings between logical cpu number and node number */
37extern cpumask_t node_2_cpu_mask[];
38extern int cpu_2_node[];
39
40/* Returns the number of the node containing CPU 'cpu' */
41static inline int cpu_to_node(int cpu)
42{
43 return cpu_2_node[cpu];
44}
45
46/* Returns the number of the node containing Node 'node'. This architecture is flat,
47 so it is a pretty simple function! */
48#define parent_node(node) (node)
49
50/* Returns a bitmask of CPUs on Node 'node'. */
51static inline cpumask_t node_to_cpumask(int node)
52{
53 return node_2_cpu_mask[node];
54}
55
56/* Returns the number of the first CPU on Node 'node'. */
57static inline int node_to_first_cpu(int node)
58{
59 cpumask_t mask = node_to_cpumask(node);
60 return first_cpu(mask);
61}
62
Andi Kleen69e1a332005-09-12 18:49:24 +020063#define pcibus_to_node(bus) ((long) (bus)->sysdata)
Christoph Lameter8c5a0902005-06-23 00:08:18 -070064#define pcibus_to_cpumask(bus) node_to_cpumask(pcibus_to_node(bus))
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66/* sched_domains SD_NODE_INIT for NUMAQ machines */
67#define SD_NODE_INIT (struct sched_domain) { \
68 .span = CPU_MASK_NONE, \
69 .parent = NULL, \
70 .groups = NULL, \
71 .min_interval = 8, \
72 .max_interval = 32, \
73 .busy_factor = 32, \
74 .imbalance_pct = 125, \
75 .cache_hot_time = (10*1000000), \
76 .cache_nice_tries = 1, \
Nick Piggin78979862005-06-25 14:57:13 -070077 .busy_idx = 3, \
78 .idle_idx = 1, \
79 .newidle_idx = 2, \
80 .wake_idx = 1, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 .per_cpu_gain = 100, \
82 .flags = SD_LOAD_BALANCE \
83 | SD_BALANCE_EXEC \
Nick Piggin687f1662005-06-25 14:57:21 -070084 | SD_BALANCE_FORK \
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 | SD_WAKE_BALANCE, \
86 .last_balance = jiffies, \
87 .balance_interval = 1, \
88 .nr_balance_failed = 0, \
89}
90
91extern unsigned long node_start_pfn[];
92extern unsigned long node_end_pfn[];
93extern unsigned long node_remap_size[];
94
95#define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
96
97#else /* !CONFIG_NUMA */
98/*
99 * Other i386 platforms should define their own version of the
100 * above macros here.
101 */
102
103#include <asm-generic/topology.h>
104
105#endif /* CONFIG_NUMA */
106
107#endif /* _ASM_I386_TOPOLOGY_H */