88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
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/*
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* arch/parisc/kernel/topology.c
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*
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* Copyright (C) 2017 Helge Deller <deller@gmx.de>
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*
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* based on arch/arm/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/percpu.h>
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#include <linux/sched.h>
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#include <linux/sched/topology.h>
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#include <linux/cpu.h>
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#include <asm/topology.h>
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#include <asm/sections.h>
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static DEFINE_PER_CPU(struct cpu, cpu_devices);
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/*
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* store_cpu_topology is called at boot when only one cpu is running
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* and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
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* which prevents simultaneous write access to cpu_topology array
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*/
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void store_cpu_topology(unsigned int cpuid)
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{
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struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
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struct cpuinfo_parisc *p;
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int max_socket = -1;
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unsigned long cpu;
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/* If the cpu topology has been already set, just return */
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if (cpuid_topo->core_id != -1)
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return;
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#ifdef CONFIG_HOTPLUG_CPU
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per_cpu(cpu_devices, cpuid).hotpluggable = 1;
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#endif
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if (register_cpu(&per_cpu(cpu_devices, cpuid), cpuid))
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pr_warn("Failed to register CPU%d device", cpuid);
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/* create cpu topology mapping */
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cpuid_topo->thread_id = -1;
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cpuid_topo->core_id = 0;
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p = &per_cpu(cpu_data, cpuid);
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for_each_online_cpu(cpu) {
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const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
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if (cpu == cpuid) /* ignore current cpu */
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continue;
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if (cpuinfo->cpu_loc == p->cpu_loc) {
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cpuid_topo->core_id = cpu_topology[cpu].core_id;
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if (p->cpu_loc) {
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cpuid_topo->core_id++;
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cpuid_topo->package_id = cpu_topology[cpu].package_id;
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continue;
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}
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}
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if (cpuid_topo->package_id == -1)
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max_socket = max(max_socket, cpu_topology[cpu].package_id);
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}
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if (cpuid_topo->package_id == -1)
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cpuid_topo->package_id = max_socket + 1;
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update_siblings_masks(cpuid);
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pr_info("CPU%u: cpu core %d of socket %d\n",
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cpuid,
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cpu_topology[cpuid].core_id,
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cpu_topology[cpuid].package_id);
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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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reset_cpu_topology();
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}
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