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8d7e3517 TL |
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 | */ | |
8d7e3517 TL |
22 | #include <linux/topology.h> |
23 | #include <linux/module.h> | |
24 | #include <asm/processor.h> | |
25 | #include <asm/smp.h> | |
26 | ||
a9de9835 | 27 | u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; |
8d7e3517 TL |
28 | EXPORT_SYMBOL(cpu_to_node_map); |
29 | ||
30 | cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; | |
a406c366 | 31 | EXPORT_SYMBOL(node_to_cpu_mask); |
8d7e3517 | 32 | |
3212fe15 KH |
33 | void __cpuinit map_cpu_to_node(int cpu, int nid) |
34 | { | |
35 | int oldnid; | |
36 | if (nid < 0) { /* just initialize by zero */ | |
37 | cpu_to_node_map[cpu] = 0; | |
38 | return; | |
39 | } | |
40 | /* sanity check first */ | |
41 | oldnid = cpu_to_node_map[cpu]; | |
42 | if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) { | |
43 | return; /* nothing to do */ | |
44 | } | |
45 | /* we don't have cpu-driven node hot add yet... | |
46 | In usual case, node is created from SRAT at boot time. */ | |
47 | if (!node_online(nid)) | |
48 | nid = first_online_node; | |
49 | cpu_to_node_map[cpu] = nid; | |
50 | cpu_set(cpu, node_to_cpu_mask[nid]); | |
51 | return; | |
52 | } | |
53 | ||
54 | void __cpuinit unmap_cpu_from_node(int cpu, int nid) | |
55 | { | |
56 | WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid])); | |
57 | WARN_ON(cpu_to_node_map[cpu] != nid); | |
58 | cpu_to_node_map[cpu] = 0; | |
59 | cpu_clear(cpu, node_to_cpu_mask[nid]); | |
60 | } | |
61 | ||
62 | ||
8d7e3517 TL |
63 | /** |
64 | * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays | |
65 | * | |
66 | * Build cpu to node mapping and initialize the per node cpu masks using | |
67 | * info from the node_cpuid array handed to us by ACPI. | |
68 | */ | |
69 | void __init build_cpu_to_node_map(void) | |
70 | { | |
71 | int cpu, i, node; | |
72 | ||
73 | for(node=0; node < MAX_NUMNODES; node++) | |
74 | cpus_clear(node_to_cpu_mask[node]); | |
75 | ||
2c6e6db4 | 76 | for_each_possible_early_cpu(cpu) { |
8d7e3517 TL |
77 | node = -1; |
78 | for (i = 0; i < NR_CPUS; ++i) | |
79 | if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) { | |
80 | node = node_cpuid[i].nid; | |
81 | break; | |
82 | } | |
3212fe15 | 83 | map_cpu_to_node(cpu, node); |
8d7e3517 TL |
84 | } |
85 | } |