linux-kernel - Re: [PATCH 2/2] arm64: dts: juno: Describe the full GICv2m region

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Date:   Mon, 12 Feb 2018 18:27:42 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Liviu Dudau <liviu.dudau@....com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/2] arm64: dts: juno: Describe the full GICv2m region

Hi Sudeep,

On 12/02/18 18:17, Sudeep Holla wrote:
> 
> 
> On 07/02/18 14:32, Marc Zyngier wrote:
>> From: Robin Murphy <robin.murphy@....com>
>>
>> Juno's GICv2m implementation consists of four frames providing 32
>> interrupts each. Since it is possible to plug in enough PCIe endpoints
>> to consume more than 32 MSIs, and the driver already has a bodge to
>> handle multiple frames, let's expose the other three as well.
>>
> 
> Change on it own looks good. So if you want to merge via your tree:
> 
> Acked-by: Sudeep Holla <sudeep.holla@....com>
> 
> Let me know if you decide not to take it via your tree and you want me
> to send it to arm-soc.

If this would usually go via arm-soc, feel free to take it via this
route. I'll drop the patch from my tree.

> On the side note I just noticed the Juno TRM[1] has 64k for each of
> these MSI frames(page 3-24 section 3.3.5 Application memory map summary)
> 
> I am not sure if TRM is wrong. This patch is just copying the 4k size
> from frame 0 which got added with initial Juno DTS.

I can't see why the TRM would be wrong. This is actually consistent with
the expected practice of aligning all devices on a 64kB boundary and
size so that you don't get any nasty surprise when passing the device to
a VM (*cough* GIC400 *cough*).

Robin, any chance you could check this?

Thanks,

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