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author | James Hogan <james.hogan@imgtec.com> | 2012-10-05 15:56:56 (GMT) |
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committer | James Hogan <james.hogan@imgtec.com> | 2013-03-02 20:09:51 (GMT) |
commit | 42682c6c42a5765b2c7cccfca170368fef6191ef (patch) | |
tree | adcfa5e96cd98527ee75fc541efc279357bbe6a2 /arch/metag/kernel/topology.c | |
parent | fdabf525b4b7aab3945c19eac39d3a65b68d0c4f (diff) | |
download | linux-42682c6c42a5765b2c7cccfca170368fef6191ef.tar.xz |
metag: SMP support
Add SMP support for metag. This allows Linux to take control of multiple
hardware threads on a single Meta core, treating them as separate Linux
CPUs.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Diffstat (limited to 'arch/metag/kernel/topology.c')
-rw-r--r-- | arch/metag/kernel/topology.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/metag/kernel/topology.c b/arch/metag/kernel/topology.c new file mode 100644 index 0000000..bec3dec --- /dev/null +++ b/arch/metag/kernel/topology.c @@ -0,0 +1,77 @@ +/* + * Copyright (C) 2007 Paul Mundt + * Copyright (C) 2010 Imagination Technolohies Ltd. + * + * 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/cpu.h> +#include <linux/cpumask.h> +#include <linux/init.h> +#include <linux/percpu.h> +#include <linux/node.h> +#include <linux/nodemask.h> +#include <linux/topology.h> + +#include <asm/cpu.h> + +DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data); + +cpumask_t cpu_core_map[NR_CPUS]; + +static cpumask_t cpu_coregroup_map(unsigned int cpu) +{ + return *cpu_possible_mask; +} + +const struct cpumask *cpu_coregroup_mask(unsigned int cpu) +{ + return &cpu_core_map[cpu]; +} + +int arch_update_cpu_topology(void) +{ + unsigned int cpu; + + for_each_possible_cpu(cpu) + cpu_core_map[cpu] = cpu_coregroup_map(cpu); + + return 0; +} + +static int __init topology_init(void) +{ + int i, ret; + +#ifdef CONFIG_NEED_MULTIPLE_NODES + for_each_online_node(i) + register_one_node(i); +#endif + + for_each_present_cpu(i) { + struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i); +#ifdef CONFIG_HOTPLUG_CPU + cpuinfo->cpu.hotpluggable = 1; +#endif + ret = register_cpu(&cpuinfo->cpu, i); + if (unlikely(ret)) + pr_warn("%s: register_cpu %d failed (%d)\n", + __func__, i, ret); + } + +#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP) + /* + * In the UP case, make sure the CPU association is still + * registered under each node. Without this, sysfs fails + * to make the connection between nodes other than node0 + * and cpu0. + */ + for_each_online_node(i) + if (i != numa_node_id()) + register_cpu_under_node(raw_smp_processor_id(), i); +#endif + + return 0; +} +subsys_initcall(topology_init); |