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