linux-kernel - Re: [PATCH RESEND v2 4/5] iommu/tegra-smmu: Rework tegra_smmu_probe

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Date:   Sat, 6 Feb 2021 13:40:13 +0000
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     will@...nel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        jonathanh@...dia.com, vdumpa@...dia.com, thierry.reding@...il.com,
        joro@...tes.org, kernel@...labora.com,
        Dmitry Osipenko <digetx@...il.com>,
        "kernelci-results@...ups.io" <kernelci-results@...ups.io>
Subject: Re: [PATCH RESEND v2 4/5] iommu/tegra-smmu: Rework
 tegra_smmu_probe_device()

On 05/02/2021 09:45, Nicolin Chen wrote:
> Hi Guillaume,
> 
> On Thu, Feb 04, 2021 at 09:24:23PM -0800, Nicolin Chen wrote:
>>> Please let us know if you need any help debugging this issue or
>>> to try a fix on this platform.
>>
>> Yes, I don't have any Tegra124 platform to run. It'd be very nice
>> if you can run some debugging patch (I can provide you) and a fix
>> after I root cause the issue.
> 
> Would it be possible for you to run with the given debugging patch?
> 
> It'd be nicer if I can get both logs of the vanilla kernel (failing)
> and the commit-reverted version (passing), each applying this patch.

Sure, I've run 3 jobs:

* v5.11-rc6 as a reference, to see the original issue:
  https://lava.collabora.co.uk/scheduler/job/3187848

* + your debug patch:
  https://lava.collabora.co.uk/scheduler/job/3187849

* + the "breaking" commit reverted, passing the tests:
  https://lava.collabora.co.uk/scheduler/job/3187851


You can see the history of the test branch I'm using here, with
the 3 revisions mentioned above:

  https://gitlab.collabora.com/gtucker/linux/-/commits/linux-5.11-rc6-nyan-big-drm-read/


Hope that helps,
Guillaume