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arm64: topology: add support to remove cpu topology sibling masks

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This patch adds support to remove all the CPU topology information using
clear_cpu_topology and also resetting the sibling information on other
sibling CPUs. This will be used in cpu_disable so that all the topology
sibling information is removed on CPU hotplug out.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Tested-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Sudeep Holla 2018-07-06 12:02:44 +01:00 committed by Will Deacon
parent 97fd6016a7
commit 5bdd2b3f0f
2 changed files with 16 additions and 0 deletions
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2
arch/arm64/include/asm/topology.h
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@ -20,9 +20,11 @@ extern struct cpu_topology cpu_topology[NR_CPUS];
#define topology_core_id(cpu) (cpu_topology[cpu].core_id) #define topology_core_id(cpu) (cpu_topology[cpu].core_id)
#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling) #define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling) #define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
#define topology_llc_cpumask(cpu) (&cpu_topology[cpu].llc_siblings)
void init_cpu_topology(void); void init_cpu_topology(void);
void store_cpu_topology(unsigned int cpuid); void store_cpu_topology(unsigned int cpuid);
void remove_cpu_topology(unsigned int cpuid);
const struct cpumask *cpu_coregroup_mask(int cpu); const struct cpumask *cpu_coregroup_mask(int cpu);
#ifdef CONFIG_NUMA #ifdef CONFIG_NUMA

14
arch/arm64/kernel/topology.c
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@ -322,6 +322,20 @@ static void __init reset_cpu_topology(void)
} }
} }
void remove_cpu_topology(unsigned int cpu)
{
int sibling;
for_each_cpu(sibling, topology_core_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
for_each_cpu(sibling, topology_sibling_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
for_each_cpu(sibling, topology_llc_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
clear_cpu_topology(cpu);
}
#ifdef CONFIG_ACPI #ifdef CONFIG_ACPI
/* /*
* Propagate the topology information of the processor_topology_node tree to the * Propagate the topology information of the processor_topology_node tree to the