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/*
* arch/arm64/kernel/topology.c
*
* Copyright (C) 2011,2013 Linaro Limited.
* Written by: Vincent Guittot
*
* 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/export.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/node.h>
#include <linux/nodemask.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <asm/cputype.h>
#include <asm/smp_plat.h>
#include <asm/topology.h>
/*
* cpu topology table
*/
struct cputopo_arm 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 cputopo_arm *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
int cpu;
/* update core and thread sibling masks */
for_each_possible_cpu(cpu) {
cpu_topo = &cpu_topology[cpu];
if (cpuid_topo->socket_id != cpu_topo->socket_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);
}
smp_wmb();
}
void store_cpu_topology(unsigned int cpuid)
{
struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid];
/* DT should have been parsed by the time we get here */
if (cpuid_topo->core_id == -1)
pr_info("CPU%u: No topology information configured\n", cpuid);
else
update_siblings_masks(cpuid);
}
/*
* cluster_to_logical_mask - return cpu logical mask of CPUs in a cluster
* @socket_id: cluster HW identifier
* @cluster_mask: the cpumask location to be initialized, modified by the
* function only if return value == 0
*
* Return:
*
* 0 on success
* -EINVAL if cluster_mask is NULL or there is no record matching socket_id
*/
int cluster_to_logical_mask(unsigned int socket_id, cpumask_t *cluster_mask)
{
int cpu;
if (!cluster_mask)
return -EINVAL;
for_each_online_cpu(cpu) {
if (socket_id == topology_physical_package_id(cpu)) {
cpumask_copy(cluster_mask, topology_core_cpumask(cpu));
return 0;
}
}
return -EINVAL;
}
/*
* 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 cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
cpu_topo->thread_id = -1;
cpu_topo->core_id = -1;
cpu_topo->socket_id = -1;
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
}
smp_wmb();
}
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