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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
8d7e3517 | 2 | /* |
8d7e3517 TL |
3 | * |
4 | * ia64 kernel NUMA specific stuff | |
5 | * | |
6 | * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de> | |
7 | * Copyright (C) 2004 Silicon Graphics, Inc. | |
8 | * Jesse Barnes <jbarnes@sgi.com> | |
9 | */ | |
8d7e3517 TL |
10 | #include <linux/topology.h> |
11 | #include <linux/module.h> | |
12 | #include <asm/processor.h> | |
13 | #include <asm/smp.h> | |
14 | ||
a9de9835 | 15 | u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; |
8d7e3517 TL |
16 | EXPORT_SYMBOL(cpu_to_node_map); |
17 | ||
18 | cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; | |
a406c366 | 19 | EXPORT_SYMBOL(node_to_cpu_mask); |
8d7e3517 | 20 | |
ccce9bb8 | 21 | void map_cpu_to_node(int cpu, int nid) |
3212fe15 KH |
22 | { |
23 | int oldnid; | |
24 | if (nid < 0) { /* just initialize by zero */ | |
25 | cpu_to_node_map[cpu] = 0; | |
26 | return; | |
27 | } | |
28 | /* sanity check first */ | |
29 | oldnid = cpu_to_node_map[cpu]; | |
5d2068da | 30 | if (cpumask_test_cpu(cpu, &node_to_cpu_mask[oldnid])) { |
3212fe15 KH |
31 | return; /* nothing to do */ |
32 | } | |
33 | /* we don't have cpu-driven node hot add yet... | |
34 | In usual case, node is created from SRAT at boot time. */ | |
35 | if (!node_online(nid)) | |
36 | nid = first_online_node; | |
37 | cpu_to_node_map[cpu] = nid; | |
5d2068da | 38 | cpumask_set_cpu(cpu, &node_to_cpu_mask[nid]); |
3212fe15 KH |
39 | return; |
40 | } | |
41 | ||
ccce9bb8 | 42 | void unmap_cpu_from_node(int cpu, int nid) |
3212fe15 | 43 | { |
5d2068da | 44 | WARN_ON(!cpumask_test_cpu(cpu, &node_to_cpu_mask[nid])); |
3212fe15 KH |
45 | WARN_ON(cpu_to_node_map[cpu] != nid); |
46 | cpu_to_node_map[cpu] = 0; | |
5d2068da | 47 | cpumask_clear_cpu(cpu, &node_to_cpu_mask[nid]); |
3212fe15 KH |
48 | } |
49 | ||
50 | ||
8d7e3517 TL |
51 | /** |
52 | * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays | |
53 | * | |
54 | * Build cpu to node mapping and initialize the per node cpu masks using | |
55 | * info from the node_cpuid array handed to us by ACPI. | |
56 | */ | |
57 | void __init build_cpu_to_node_map(void) | |
58 | { | |
59 | int cpu, i, node; | |
60 | ||
61 | for(node=0; node < MAX_NUMNODES; node++) | |
5d2068da | 62 | cpumask_clear(&node_to_cpu_mask[node]); |
8d7e3517 | 63 | |
2c6e6db4 | 64 | for_each_possible_early_cpu(cpu) { |
98fa15f3 | 65 | node = NUMA_NO_NODE; |
8d7e3517 TL |
66 | for (i = 0; i < NR_CPUS; ++i) |
67 | if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) { | |
68 | node = node_cpuid[i].nid; | |
69 | break; | |
70 | } | |
3212fe15 | 71 | map_cpu_to_node(cpu, node); |
8d7e3517 TL |
72 | } |
73 | } |