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

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On Thu, 20 Oct 2022, Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> 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.


-- 
Jani Nikula, Intel Open Source Graphics Center




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