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