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Message-ID: <MN2PR12MB43583BB73731986D15B3620789249@MN2PR12MB4358.namprd12.prod.outlook.com>
Date: Fri, 14 Oct 2022 12:13:45 +0000
From: "Radovanovic, Aleksandar" <aleksandar.radovanovic@....com>
To: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
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Subject: RE: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its
domain as parent
[AMD Official Use Only - General]
> -----Original Message-----
> From: gregkh@...uxfoundation.org <gregkh@...uxfoundation.org>
> Sent: 14 October 2022 12:55
> To: Radovanovic, Aleksandar <aleksandar.radovanovic@....com>
> Cc: Jason Gunthorpe <jgg@...pe.ca>; Gupta, Nipun
> <Nipun.Gupta@....com>; Marc Zyngier <maz@...nel.org>; Robin Murphy
> <robin.murphy@....com>; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; rafael@...nel.org;
> eric.auger@...hat.com; alex.williamson@...hat.com; cohuck@...hat.com;
> Gupta, Puneet (DCG-ENG) <puneet.gupta@....com>;
> song.bao.hua@...ilicon.com; mchehab+huawei@...nel.org;
> f.fainelli@...il.com; jeffrey.l.hugo@...il.com; saravanak@...gle.com;
> Michael.Srba@...nam.cz; mani@...nel.org; yishaih@...dia.com;
> will@...nel.org; joro@...tes.org; masahiroy@...nel.org;
> ndesaulniers@...gle.com; linux-arm-kernel@...ts.infradead.org; linux-
> kbuild@...r.kernel.org; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; kvm@...r.kernel.org; okaya@...nel.org;
> Anand, Harpreet <harpreet.anand@....com>; Agarwal, Nikhil
> <nikhil.agarwal@....com>; Simek, Michal <michal.simek@....com>; git
> (AMD-Xilinx) <git@....com>
> Subject: Re: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its
> domain as parent
>
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
>
>
> On Fri, Oct 14, 2022 at 11:18:36AM +0000, Radovanovic, Aleksandar wrote:
> > Anyway, I think we're straying off topic here, none of this is visible to the
> kernel anyway. The question that we still need to answer is, are you OK with
> the limitations I listed originally?
>
> What original limitations?
Limitations with regards to MSI message configuration of a CDX device:
1) MSI write value is at most 16 useable bits
2) MSI address value must be the same across all vectors of a single CDX device
This would be the (potentially IOMMU translated) I/O address of
GITS_TRANSLATER. As long as that IOMMU translation is consistent across a
single device, I think we should be OK.
> This thread is crazy and complex and you need to
> use your \n key more :)
I do try, but the corporate mail client that we're stuck with seems to just merge
everything back together. Sigh.
> thanks,
>
> greg k-h
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