From 5bdd2b3f0f8830f281bb568e65df6eabf655dd0d Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Fri, 6 Jul 2018 12:02:44 +0100 Subject: [PATCH] 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 Cc: Will Deacon Tested-by: Ganapatrao Kulkarni Tested-by: Hanjun Guo Signed-off-by: Sudeep Holla Signed-off-by: Will Deacon --- arch/arm64/include/asm/topology.h | 2 ++ arch/arm64/kernel/topology.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h index df48212..4c073d2 100644 --- a/arch/arm64/include/asm/topology.h +++ b/arch/arm64/include/asm/topology.h @@ -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 diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index b64733c5e..cb81df5 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -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 -- 2.7.4