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Commit 5bdd2b3f authored by Sudeep Holla's avatar Sudeep Holla Committed by Will Deacon
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arm64: topology: add support to remove cpu topology sibling masks 



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: default avatarGanapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
Tested-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 97fd6016

arch/arm64/include/asm/topology.h

+2 −0
Original line number Diff line number Diff line
@@ -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_cpumask(cpu)	(&cpu_topology[cpu].core_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 store_cpu_topology(unsigned int cpuid);

void remove_cpu_topology(unsigned int cpuid);

const struct cpumask *cpu_coregroup_mask(int cpu);



#ifdef CONFIG_NUMA

arch/arm64/kernel/topology.c

+14 −0
Original line number Diff line number Diff line
@@ -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

/*

 * Propagate the topology information of the processor_topology_node tree to the