96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/*
|
|
* arch/arm64/kernel/topology.c
|
|
*
|
|
* Copyright (C) 2011,2013,2014 Linaro Limited.
|
|
*
|
|
* Based on the arm32 version written by Vincent Guittot in turn based on
|
|
* arch/sh/kernel/topology.c
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/cpu.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/init.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/node.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include <asm/topology.h>
|
|
|
|
/*
|
|
* cpu topology table
|
|
*/
|
|
struct cpu_topology cpu_topology[NR_CPUS];
|
|
EXPORT_SYMBOL_GPL(cpu_topology);
|
|
|
|
const struct cpumask *cpu_coregroup_mask(int cpu)
|
|
{
|
|
return &cpu_topology[cpu].core_sibling;
|
|
}
|
|
|
|
static void update_siblings_masks(unsigned int cpuid)
|
|
{
|
|
struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
|
|
int cpu;
|
|
|
|
if (cpuid_topo->cluster_id == -1) {
|
|
/*
|
|
* DT does not contain topology information for this cpu
|
|
* reset it to default behaviour
|
|
*/
|
|
pr_debug("CPU%u: No topology information configured\n", cpuid);
|
|
cpuid_topo->core_id = 0;
|
|
cpumask_set_cpu(cpuid, &cpuid_topo->core_sibling);
|
|
cpumask_set_cpu(cpuid, &cpuid_topo->thread_sibling);
|
|
return;
|
|
}
|
|
|
|
/* update core and thread sibling masks */
|
|
for_each_possible_cpu(cpu) {
|
|
cpu_topo = &cpu_topology[cpu];
|
|
|
|
if (cpuid_topo->cluster_id != cpu_topo->cluster_id)
|
|
continue;
|
|
|
|
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
|
|
if (cpu != cpuid)
|
|
cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
|
|
|
|
if (cpuid_topo->core_id != cpu_topo->core_id)
|
|
continue;
|
|
|
|
cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
|
|
if (cpu != cpuid)
|
|
cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
|
|
}
|
|
}
|
|
|
|
void store_cpu_topology(unsigned int cpuid)
|
|
{
|
|
update_siblings_masks(cpuid);
|
|
}
|
|
|
|
/*
|
|
* init_cpu_topology is called at boot when only one cpu is running
|
|
* which prevent simultaneous write access to cpu_topology array
|
|
*/
|
|
void __init init_cpu_topology(void)
|
|
{
|
|
unsigned int cpu;
|
|
|
|
/* init core mask and power*/
|
|
for_each_possible_cpu(cpu) {
|
|
struct cpu_topology *cpu_topo = &cpu_topology[cpu];
|
|
|
|
cpu_topo->thread_id = -1;
|
|
cpu_topo->core_id = -1;
|
|
cpu_topo->cluster_id = -1;
|
|
cpumask_clear(&cpu_topo->core_sibling);
|
|
cpumask_clear(&cpu_topo->thread_sibling);
|
|
}
|
|
}
|