1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/topology.c 4 * 5 * Copyright (C) 2007 Paul Mundt 6 */ 7 #include <linux/cpu.h> 8 #include <linux/cpumask.h> 9 #include <linux/init.h> 10 #include <linux/percpu.h> 11 #include <linux/topology.h> 12 #include <linux/node.h> 13 #include <linux/nodemask.h> 14 #include <linux/export.h> 15 16 static DEFINE_PER_CPU(struct cpu, cpu_devices); 17 18 cpumask_t cpu_core_map[NR_CPUS]; 19 EXPORT_SYMBOL(cpu_core_map); 20 21 static cpumask_t cpu_coregroup_map(int cpu) 22 { 23 /* 24 * Presently all SH-X3 SMP cores are multi-cores, so just keep it 25 * simple until we have a method for determining topology.. 26 */ 27 return *cpu_possible_mask; 28 } 29 30 const struct cpumask *cpu_coregroup_mask(int cpu) 31 { 32 return &cpu_core_map[cpu]; 33 } 34 35 int arch_update_cpu_topology(void) 36 { 37 unsigned int cpu; 38 39 for_each_possible_cpu(cpu) 40 cpu_core_map[cpu] = cpu_coregroup_map(cpu); 41 42 return 0; 43 } 44 45 static int __init topology_init(void) 46 { 47 int i, ret; 48 49 for_each_present_cpu(i) { 50 struct cpu *c = &per_cpu(cpu_devices, i); 51 52 c->hotpluggable = 1; 53 54 ret = register_cpu(c, i); 55 if (unlikely(ret)) 56 printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n", 57 __func__, i, ret); 58 } 59 60 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP) 61 /* 62 * In the UP case, make sure the CPU association is still 63 * registered under each node. Without this, sysfs fails 64 * to make the connection between nodes other than node0 65 * and cpu0. 66 */ 67 for_each_online_node(i) 68 if (i != numa_node_id()) 69 register_cpu_under_node(raw_smp_processor_id(), i); 70 #endif 71 72 return 0; 73 } 74 subsys_initcall(topology_init); 75