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