// 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);
|
}
|
}
|
