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From:   Parth Shah <parth@linux.ibm.com>
To:     linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org
Cc:     peterz@infradead.org, mingo@redhat.com, vincent.guittot@linaro.org,
        dietmar.eggemann@arm.com, patrick.bellasi@matbug.net,
        valentin.schneider@arm.com, pavel@ucw.cz, dsmythies@telus.net,
        qperret@google.com, tim.c.chen@linux.intel.com
Subject: [RFC v6 5/5] powerpc: Set turbo domain to NUMA node for task packing
Date:   Tue, 21 Jan 2020 12:03:07 +0530
In-Reply-To: <20200121063307.17221-1-parth@linux.ibm.com>
References: <20200121063307.17221-1-parth@linux.ibm.com>
Message-Id: <20200121063307.17221-6-parth@linux.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Provide an powerpc architecture specific implementation for defining the
turbo domain to make searching of the core to be bound within the NUMA.

The POWER9 systems have a pair of cores in the LLC domain. Hence to make
TurboSched more effective, increase the domain space for task packing
to search within NUMA domain.

Signed-off-by: Parth Shah <parth@linux.ibm.com>
---
 arch/powerpc/include/asm/topology.h | 3 +++
 arch/powerpc/kernel/smp.c           | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 2f7e1ea5089e..83adfb99f8ba 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -138,6 +138,9 @@ static inline void shared_proc_topology_init(void) {}
 #define topology_sibling_cpumask(cpu)	(per_cpu(cpu_sibling_map, cpu))
 #define topology_core_cpumask(cpu)	(per_cpu(cpu_core_map, cpu))
 #define topology_core_id(cpu)		(cpu_to_core_id(cpu))
+#define arch_turbo_domain		powerpc_turbo_domain
+
+struct cpumask *powerpc_turbo_domain(int cpu);
 
 int dlpar_cpu_readd(int cpu);
 #endif
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index ea6adbf6a221..0fc4443a3f27 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1169,6 +1169,13 @@ static void remove_cpu_from_masks(int cpu)
 }
 #endif
 
+#ifdef CONFIG_SCHED_SMT
+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)
 {
 	struct cpumask *this_l1_cache_map = per_cpu(cpu_l1_cache_map, cpu);
-- 
2.17.2