linux-kernel - Re: [Intel-gfx] [PATCH v7 0/9] dyndbg: drm.debug adaptation

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Date:   Thu, 27 Oct 2022 11:08:16 -0400
From:   Jason Baron <jbaron@...mai.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     Jim Cromie <jim.cromie@...il.com>, daniel.vetter@...ll.ch,
        intel-gfx@...ts.freedesktop.org, linux@...musvillemoes.dk,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        seanpaul@...omium.org, dri-devel@...ts.freedesktop.org,
        joe@...ches.com, intel-gvt-dev@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH v7 0/9] dyndbg: drm.debug adaptation



On 10/21/22 05:18, Jani Nikula wrote:
> On Thu, 20 Oct 2022, Ville Syrjälä <ville.syrjala@...ux.intel.com> wrote:
>> On Sat, Sep 24, 2022 at 03:02:34PM +0200, Greg KH wrote:
>>> On Sun, Sep 11, 2022 at 11:28:43PM -0600, Jim Cromie wrote:
>>>> hi Greg, Dan, Jason, DRM-folk,
>>>>
>>>> heres follow-up to V6:
>>>>   rebased on driver-core/driver-core-next for -v6 applied bits (thanks)
>>>>   rework drm_debug_enabled{_raw,_instrumented,} per Dan.
>>>>
>>>> It excludes:
>>>>   nouveau parts (immature)
>>>>   tracefs parts (I missed --to=Steve on v6)
>>>>   split _ddebug_site and de-duplicate experiment (way unready)
>>>>
>>>> IOW, its the remaining commits of V6 on which Dan gave his Reviewed-by.
>>>>
>>>> If these are good to apply, I'll rebase and repost the rest separately.
>>>
>>> All now queued up, thanks.
>>
>> This stuff broke i915 debugs. When I first load i915 no debug prints are
>> produced. If I then go fiddle around in /sys/module/drm/parameters/debug
>> the debug prints start to suddenly work.
> 
> Wait what? I always assumed the default behaviour would stay the same,
> which is usually how we roll. It's a regression in my books. We've got a
> CI farm that's not very helpful in terms of dmesg logging right now
> because of this.
> 
> BR,
> Jani.
> 
> 

That doesn't sound good - so you are saying that prior to this change some
of the drm debugs were default enabled. But now you have to manually enable
them?

Thanks,

-Jason