linux-kernel - [RFCv3 8/8] powerpc: Set turbo domain to NUMA node for task packing

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Date:   Tue, 25 Jun 2019 10:07:26 +0530
From:   Parth Shah <parth@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, dietmar.eggemann@....com,
        patrick.bellasi@....com
Subject: [RFCv3 8/8] powerpc: Set turbo domain to NUMA node for task packing

This patch provides an powerpc architecture specific implementation for
defining the turbo domain to make searching of the core to be bound within
the NUMA.  This provides a way to decrease the searching time for specific
architectures.

Signed-off-by: Parth Shah <parth@...ux.ibm.com>
---
 arch/powerpc/include/asm/topology.h | 3 +++
 arch/powerpc/kernel/smp.c           | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 1c777ee67180..410b94c9e1a2 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -133,10 +133,13 @@ static inline void shared_proc_topology_init(void) {}
 #define topology_core_cpumask(cpu)	(per_cpu(cpu_core_map, cpu))
 #define topology_core_id(cpu)		(cpu_to_core_id(cpu))
 #define arch_scale_core_capacity	powerpc_scale_core_capacity
+#define arch_turbo_domain		powerpc_turbo_domain
 
 unsigned long powerpc_scale_core_capacity(int first_smt,
 					  unsigned long smt_cap);
 
+struct cpumask *powerpc_turbo_domain(int cpu);
+
 int dlpar_cpu_readd(int cpu);
 #endif
 #endif
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 149a3fbf8ed3..856f7233190e 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1200,6 +1200,11 @@ unsigned long powerpc_scale_core_capacity(int first_cpu,
 	/* Scale core capacity based on smt mode */
 	return smt_mode == 1 ? cap : ((cap * smt_mode) >> 3) + cap;
 }
+
+inline struct cpumask *powerpc_turbo_domain(int cpu)
+{
+	return cpumask_of_node(cpu_to_node(cpu));
+}
 #endif
 
 static inline void add_cpu_to_smallcore_masks(int cpu)
-- 
2.17.1