74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* ia64 kernel NUMA specific stuff
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*
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* Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
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* Copyright (C) 2004 Silicon Graphics, Inc.
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* Jesse Barnes <jbarnes@sgi.com>
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*/
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#include <linux/topology.h>
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#include <linux/module.h>
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#include <asm/processor.h>
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#include <asm/smp.h>
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u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
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EXPORT_SYMBOL(cpu_to_node_map);
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cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
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EXPORT_SYMBOL(node_to_cpu_mask);
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void map_cpu_to_node(int cpu, int nid)
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{
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int oldnid;
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if (nid < 0) { /* just initialize by zero */
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cpu_to_node_map[cpu] = 0;
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return;
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}
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/* sanity check first */
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oldnid = cpu_to_node_map[cpu];
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if (cpumask_test_cpu(cpu, &node_to_cpu_mask[oldnid])) {
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return; /* nothing to do */
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}
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/* we don't have cpu-driven node hot add yet...
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In usual case, node is created from SRAT at boot time. */
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if (!node_online(nid))
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nid = first_online_node;
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cpu_to_node_map[cpu] = nid;
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cpumask_set_cpu(cpu, &node_to_cpu_mask[nid]);
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return;
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}
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void unmap_cpu_from_node(int cpu, int nid)
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{
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WARN_ON(!cpumask_test_cpu(cpu, &node_to_cpu_mask[nid]));
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WARN_ON(cpu_to_node_map[cpu] != nid);
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cpu_to_node_map[cpu] = 0;
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cpumask_clear_cpu(cpu, &node_to_cpu_mask[nid]);
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}
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/**
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* build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
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*
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* Build cpu to node mapping and initialize the per node cpu masks using
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* info from the node_cpuid array handed to us by ACPI.
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*/
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void __init build_cpu_to_node_map(void)
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{
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int cpu, i, node;
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for(node=0; node < MAX_NUMNODES; node++)
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cpumask_clear(&node_to_cpu_mask[node]);
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for_each_possible_early_cpu(cpu) {
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node = NUMA_NO_NODE;
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for (i = 0; i < NR_CPUS; ++i)
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if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) {
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node = node_cpuid[i].nid;
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break;
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}
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map_cpu_to_node(cpu, node);
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}
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}
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