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

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Date:	Tue, 1 Mar 2016 12:18:23 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	Andre Przywara <andre.przywara@....com>,
	linux-meson@...glegroups.com
Cc:	Mark Rutland <mark.rutland@....com>,
	devicetree <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>,
	LKML <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 Andre,

Am 01.03.2016 um 12:01 schrieb Andre Przywara:
> 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?

I do not have a rootfs yet (MMC v5 patches by Carlo are still waiting
for review), but with this change the KVM driver initializes okay - the
purpose of this patch!

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

If people confirm this is generally or specifically for this SoC correct
then sure. So far 3/8 seems a safe subset for lack of public documentation.

>> 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.

I took what /proc/device-tree showed on Android and verified that this
compatible is in use in mainline.

>>  			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.

Will test later.

Is there any easy way to find out whether or not this is that GIC-400?

Thanks,
Andreas

> [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)>;

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