The ARM Cortex-A7 cores used in the Allwinner R40 SoC have their usual Performance Monitoring Unit (PMU), which allows perf to use hardware events. The SoC integrator just needs to connect each per-core interrupt line to the GIC. The R40 manual does not really mention those IRQ lines, but experimentation in U-Boot shows that interrupts 152-155 are connected to the four cores (similar to the A20).
Tested on a Bananapi M2 Berry, with perf and taskset to confirm the association between cores and interrupts. Signed-off-by: Andre Przywara <[email protected]> --- arch/arm/boot/dts/sun8i-r40.dtsi | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi index 768dffb37117..8dcbc4465fbb 100644 --- a/arch/arm/boot/dts/sun8i-r40.dtsi +++ b/arch/arm/boot/dts/sun8i-r40.dtsi @@ -78,25 +78,25 @@ #address-cells = <1>; #size-cells = <0>; - cpu@0 { + cpu0: cpu@0 { compatible = "arm,cortex-a7"; device_type = "cpu"; reg = <0>; }; - cpu@1 { + cpu1: cpu@1 { compatible = "arm,cortex-a7"; device_type = "cpu"; reg = <1>; }; - cpu@2 { + cpu2: cpu@2 { compatible = "arm,cortex-a7"; device_type = "cpu"; reg = <2>; }; - cpu@3 { + cpu3: cpu@3 { compatible = "arm,cortex-a7"; device_type = "cpu"; reg = <3>; @@ -884,6 +884,15 @@ }; }; + pmu { + compatible = "arm,cortex-a7-pmu"; + interrupts = <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>; + interrupt-affinity = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>; + }; + timer { compatible = "arm,armv7-timer"; interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>, -- 2.14.5 -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/20200102012657.9278-3-andre.przywara%40arm.com.
