linux-kernel - Re: snd-cmipci oops during probe on arm64 (current mainline, pre-6.6-rc1)

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Message-ID: <ZPk1mpbSeK7+eVs2@geday>
Date:   Wed, 6 Sep 2023 23:29:46 -0300
From:   Geraldo Nascimento <geraldogabriel@...il.com>
To:     Antonio Terceiro <antonio.terceiro@...aro.org>
Cc:     Robin Murphy <robin.murphy@....com>, Takashi Iwai <tiwai@...e.de>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: snd-cmipci oops during probe on arm64 (current mainline,
 pre-6.6-rc1)

On Wed, Sep 06, 2023 at 03:36:40PM -0300, Antonio Terceiro wrote:
> On Wed, Sep 06, 2023 at 01:49:16PM +0100, Robin Murphy wrote:
> > It's blowing up trying to access PCI I/O space, which has apparently ended
> > up in the indirect access mechanism without that being configured correctly.
> > That is definitely an issue down somewhere between the PCI layer and the
> > system firmware. Does the system even have an I/O space window? Some arm64
> > machines don't. I guess we might not have got as far as probing a driver if
> > the I/O BAR couldn't be assigned at all, but either way something's not gone
> > right.
> 
> I'm pretty sure I saw reports of people using PCI GPUs on this machine,
> but I would need to confirm.
> 
> What info would I need to gather from the machine in order to figure
> this out?

Antonio, please see:
https://community.amperecomputing.com/t/amd-gpus-on-the-altra-devkit-and-other-altras-patches-available-now/336/11

You have a quirky PCIe controller it seems. You'll have to go through
the errata and then some.

Good Luck,
Geraldo Nascimento