linux-kernel - [PATCH v2] ARM: dts: exynos: add cpu perf counters to Exynos54xx boards

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Date:   Tue, 24 Oct 2017 12:59:56 +1030
From:   memeka <mihailescu2m@...il.com>
To:     robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk,
        kgene@...nel.org, krzk@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     memeka <mihailescu2m@...il.com>,
        Willy Wolff <willy.mh.wolff@...il.com>
Subject: [PATCH v2] ARM: dts: exynos: add cpu perf counters to Exynos54xx boards

Enable support for ARM Performance Monitoring Units available in Cortex-A7
and Cortex-A15 CPU cores for Exynos54xx SoCs (5410, 5420 and 5422/5800).

The PMUs interrupts are defined in the common exynos54xx.dtsi device tree,
but the PMUs are enabled and have their interrupt CPU affinity defined
next to each SoC's cpus node.

Tested with perf on Odroid XU4 (Exynos5422):
armv7_cortex_a7 PMU driver: 5 counters available
armv7_cortex_a15 PMU driver: 7 counters available

Suggested-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Marian Mihailescu <mihailescu2m@...il.com>
Signed-off-by: Willy Wolff <willy.mh.wolff@...il.com>

---
Changes since v1:
 - both Cortex-A7 and Cortex-A15 PMUs are now defined in exynos54xx.dtsi
 - CPU affinity is defined for each SoC *after* the cpus node entry
 - PMUs are disabled in exynos54xx.dtsi and enabled for each SoC
 - cpus labels have been fixed in the interrupt-affinity property for
   Exynos5410 and Exynos5420 SoCs

---
 arch/arm/boot/dts/exynos5410.dtsi      |  8 ++++++++
 arch/arm/boot/dts/exynos5420-cpus.dtsi | 16 ++++++++++++++++
 arch/arm/boot/dts/exynos5422-cpus.dtsi | 16 ++++++++++++++++
 arch/arm/boot/dts/exynos54xx.dtsi      | 20 ++++++++++++++++++++
 4 files changed, 60 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5410.dtsi b/arch/arm/boot/dts/exynos5410.dtsi
index 7eab4bc..f42b04b 100644
--- a/arch/arm/boot/dts/exynos5410.dtsi
+++ b/arch/arm/boot/dts/exynos5410.dtsi
@@ -428,4 +428,12 @@
 	samsung,syscon-phandle = <&pmu_system_controller>;
 };
 
+&arm_a15_pmu {
+	interrupt-affinity = <&cpu0>,
+		<&cpu1>,
+		<&cpu2>,
+		<&cpu3>;
+	status = "okay";
+};
+
 #include "exynos5410-pinctrl.dtsi"
diff --git a/arch/arm/boot/dts/exynos5420-cpus.dtsi b/arch/arm/boot/dts/exynos5420-cpus.dtsi
index 5c052d7..518b7d8 100644
--- a/arch/arm/boot/dts/exynos5420-cpus.dtsi
+++ b/arch/arm/boot/dts/exynos5420-cpus.dtsi
@@ -124,3 +124,19 @@
 		};
 	};
 };
+
+&arm_a7_pmu {
+	interrupt-affinity = <&cpu4>,
+		<&cpu5>,
+		<&cpu4>,
+		<&cpu5>;
+	status = "okay";
+};
+
+&arm_a15_pmu {
+	interrupt-affinity = <&cpu0>,
+		<&cpu1>,
+		<&cpu2>,
+		<&cpu3>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/exynos5422-cpus.dtsi b/arch/arm/boot/dts/exynos5422-cpus.dtsi
index ab4c718..92676be 100644
--- a/arch/arm/boot/dts/exynos5422-cpus.dtsi
+++ b/arch/arm/boot/dts/exynos5422-cpus.dtsi
@@ -131,3 +131,19 @@
 		};
 	};
 };
+
+&arm_a7_pmu {
+	interrupt-affinity = <&cpu0>,
+		<&cpu1>,
+		<&cpu2>,
+		<&cpu3>;
+	status = "okay";
+};
+
+&arm_a15_pmu {
+	interrupt-affinity = <&cpu4>,
+		<&cpu5>,
+		<&cpu6>,
+		<&cpu7>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/exynos54xx.dtsi b/arch/arm/boot/dts/exynos54xx.dtsi
index 8ca4fef..f0bd27d 100644
--- a/arch/arm/boot/dts/exynos54xx.dtsi
+++ b/arch/arm/boot/dts/exynos54xx.dtsi
@@ -79,6 +79,26 @@
 			interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
+		arm_a7_pmu: arm-a7-pmu {
+			compatible = "arm,cortex-a7-pmu";
+			interrupt-parent = <&gic>;
+			interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
+				<GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH>,
+				<GIC_SPI 162 IRQ_TYPE_LEVEL_HIGH>,
+				<GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>;
+			status = "disabled";
+		};
+
+		arm_a15_pmu: arm-a15-pmu {
+			compatible = "arm,cortex-a15-pmu";
+			interrupt-parent = <&combiner>;
+			interrupts = <1 2>,
+				<7 0>,
+				<16 6>,
+				<19 2>;
+			status = "disabled";
+		};
+
 		sss: sss@...30000 {
 			compatible = "samsung,exynos4210-secss";
 			reg = <0x10830000 0x300>;
-- 
2.7.4