1/*
2 *  Copyright (C) 2007  Paul Mundt
3 *  Copyright (C) 2010  Imagination Technolohies Ltd.
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License.  See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9#include <linux/cpu.h>
10#include <linux/cpumask.h>
11#include <linux/init.h>
12#include <linux/percpu.h>
13#include <linux/node.h>
14#include <linux/nodemask.h>
15#include <linux/topology.h>
16
17#include <asm/cpu.h>
18
19DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data);
20
21cpumask_t cpu_core_map[NR_CPUS];
22EXPORT_SYMBOL(cpu_core_map);
23
24static cpumask_t cpu_coregroup_map(unsigned int cpu)
25{
26	return *cpu_possible_mask;
27}
28
29const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
30{
31	return &cpu_core_map[cpu];
32}
33
34int arch_update_cpu_topology(void)
35{
36	unsigned int cpu;
37
38	for_each_possible_cpu(cpu)
39		cpu_core_map[cpu] = cpu_coregroup_map(cpu);
40
41	return 0;
42}
43
44static int __init topology_init(void)
45{
46	int i, ret;
47
48#ifdef CONFIG_NEED_MULTIPLE_NODES
49	for_each_online_node(i)
50		register_one_node(i);
51#endif
52
53	for_each_present_cpu(i) {
54		struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i);
55#ifdef CONFIG_HOTPLUG_CPU
56		cpuinfo->cpu.hotpluggable = 1;
57#endif
58		ret = register_cpu(&cpuinfo->cpu, i);
59		if (unlikely(ret))
60			pr_warn("%s: register_cpu %d failed (%d)\n",
61				__func__, i, ret);
62	}
63
64#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
65	/*
66	 * In the UP case, make sure the CPU association is still
67	 * registered under each node. Without this, sysfs fails
68	 * to make the connection between nodes other than node0
69	 * and cpu0.
70	 */
71	for_each_online_node(i)
72		if (i != numa_node_id())
73			register_cpu_under_node(raw_smp_processor_id(), i);
74#endif
75
76	return 0;
77}
78subsys_initcall(topology_init);
79