xref: /openbmc/linux/arch/ia64/kernel/numa.c (revision 95d465fd750897ab32462a6702fbfe1b122cbbc0)
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 2 of the License, or
5  * (at your option) any later version.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * along with this program; if not, write to the Free Software
14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15  *
16  * ia64 kernel NUMA specific stuff
17  *
18  * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
19  * Copyright (C) 2004 Silicon Graphics, Inc.
20  *   Jesse Barnes <jbarnes@sgi.com>
21  */
22 #include <linux/config.h>
23 #include <linux/topology.h>
24 #include <linux/module.h>
25 #include <asm/processor.h>
26 #include <asm/smp.h>
27 
28 u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
29 EXPORT_SYMBOL(cpu_to_node_map);
30 
31 cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
32 
33 /**
34  * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
35  *
36  * Build cpu to node mapping and initialize the per node cpu masks using
37  * info from the node_cpuid array handed to us by ACPI.
38  */
39 void __init build_cpu_to_node_map(void)
40 {
41 	int cpu, i, node;
42 
43 	for(node=0; node < MAX_NUMNODES; node++)
44 		cpus_clear(node_to_cpu_mask[node]);
45 
46 	for(cpu = 0; cpu < NR_CPUS; ++cpu) {
47 		node = -1;
48 		for (i = 0; i < NR_CPUS; ++i)
49 			if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) {
50 				node = node_cpuid[i].nid;
51 				break;
52 			}
53 		cpu_to_node_map[cpu] = (node >= 0) ? node : 0;
54 		if (node >= 0)
55 			cpu_set(cpu, node_to_cpu_mask[node]);
56 	}
57 }
58