linux-kernel - Re: [PATCH 7/8] ARM64: dts: amlogic: Extend GXBaby GIC node

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Date:	Tue, 1 Mar 2016 11:01:07 +0000
From:	Andre Przywara <andre.przywara@....com>
To:	Andreas Färber <afaerber@...e.de>,
	linux-meson@...glegroups.com
Cc:	Mark Rutland <mark.rutland@....com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>, Matthias Brugger <mbrugger@...e.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Nicolas Saenz <nicolassaenzj@...il.com>,
	Will Deacon <will.deacon@....com>,
	open list <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Carlo Caione <carlo@...one.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 7/8] ARM64: dts: amlogic: Extend GXBaby GIC node

Hi Andreas,

On 29/02/16 23:44, Andreas Färber wrote:
> Add GICH and GICV resources for HYP mode - guess based on other vendors.

Do you know if the firmware allows the kernel to be entered in EL2
(which is the arm64 name for HYP)?
So can we run kvm?
If you have a booted kernel, can you grep for "EL2" and "kvm" in the dmesg?

Also you should merge this patch into 3/8, same for 8/8.

> Signed-off-by: Andreas Färber <afaerber@...e.de>
> ---
>  arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> index 0ae089bd1806..5088ae3ff653 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> @@ -117,7 +117,9 @@
>  		gic: interrupt-controller@...01000 {
>  			compatible = "arm,cortex-a15-gic", "arm,cortex-a9-gic";

I think "arm,gic-400" is the name to use here these days, especially for
arm64.

>  			reg = <0x0 0xc4301000 0 0x1000>,
> -			      <0x0 0xc4302000 0 0x0100>;
> +			      <0x0 0xc4302000 0 0x0100>,

Please use 0x2000 for the size here. I guess this is really the GIC-400
from ARM, and in this case this is the right size, [1] is the reference
here. This will enable EOI mode 1 for KVM.

Cheers,
Andre.

[1]
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0471b/CHDIFAEE.html

> +			      <0x0 0xc4304000 0 0x2000>,
> +			      <0x0 0xc4306000 0 0x2000>;
>  			interrupt-controller;
>  			interrupts = <GIC_PPI 9
>  				(GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_HIGH)>;
>