linux-kernel - Re: [PATCH V3] arm64: amd-seattle: Adding device tree for AMD Seattle platform

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Date:	Fri, 21 Nov 2014 14:48:29 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Will Deacon <Will.Deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>
CC:	Liviu Dudau <Liviu.Dudau@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Lendacky, Thomas" <Thomas.Lendacky@....com>,
	"Schopp, Joel" <Joel.Schopp@....com>
Subject: Re: [PATCH V3] arm64: amd-seattle: Adding device tree for AMD Seattle
 platform

On 21/11/14 14:40, Suthikulpanit, Suravee wrote:
> 
> 
> On 11/21/14, 19:57, "Marc Zyngier" <marc.zyngier@....com> wrote:
> 
>>> +	gic: interrupt-controller@...01000 {
>>> +		compatible = "arm,gic-400", "arm,cortex-a15-gic";
>>> +		interrupt-controller;
>>> +		#interrupt-cells = <3>;
>>> +		#address-cells = <2>;
>>> +		#size-cells = <2>;
>>> +		reg = <0x0 0xe1110000 0 0x1000>,
>>> +		      <0x0 0xe112f000 0 0x2000>,
>>> +		      <0x0 0xe1140000 0 0x10000>,
>>> +		      <0x0 0xe1160000 0 0x10000>;
>>> +		interrupts = <1 8 0xf04>;
>>
>> Are you sure about this one? ARM systems usually have this wired on PPI9
>> (interrupt 25)...
>>
>> Thanks,
>>
>> 	M.
> 
> I think you might be right. GIC-400 TRM says that this is should be
> 25, and used for virtual maintenance interrupts. How can I verify
> this in Linux? KVM?

KVM is one way, but you'll never see the interrupt firing (we kill the
interrupt while in HYP, before the kernel gets a chance to see it).

If you effectively have GIC400 on this system, then I know for sure this
is interrupt 25.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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