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Linux/arch/sh/kernel/topology.c

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  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 #ifdef CONFIG_NEED_MULTIPLE_NODES
 50         for_each_online_node(i)
 51                 register_one_node(i);
 52 #endif
 53 
 54         for_each_present_cpu(i) {
 55                 struct cpu *c = &per_cpu(cpu_devices, i);
 56 
 57                 c->hotpluggable = 1;
 58 
 59                 ret = register_cpu(c, i);
 60                 if (unlikely(ret))
 61                         printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n",
 62                                __func__, i, ret);
 63         }
 64 
 65 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
 66         /*
 67          * In the UP case, make sure the CPU association is still
 68          * registered under each node. Without this, sysfs fails
 69          * to make the connection between nodes other than node0
 70          * and cpu0.
 71          */
 72         for_each_online_node(i)
 73                 if (i != numa_node_id())
 74                         register_cpu_under_node(raw_smp_processor_id(), i);
 75 #endif
 76 
 77         return 0;
 78 }
 79 subsys_initcall(topology_init);
 80 

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