linux-kernel - Re: [Intel-gfx] [PATCH v2 00/17] drm: cleanup: Use DRM_MODESET_LOCK_ALL

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Date:   Sat, 2 Oct 2021 09:13:22 +0200
From:   Fernando Ramos <greenfoo@....eu>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     Sean Paul <sean@...rly.run>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH v2 00/17] drm: cleanup: Use
 DRM_MODESET_LOCK_ALL_* helpers where possible

On 21/10/02 05:30AM, Ville Syrjälä wrote:
> On Sat, Oct 02, 2021 at 01:05:47AM +0300, Ville Syrjälä wrote:
> > On Fri, Oct 01, 2021 at 04:48:15PM -0400, Sean Paul wrote:
> > > On Fri, Oct 01, 2021 at 10:00:50PM +0300, Ville Syrjälä wrote:
> > > > On Fri, Oct 01, 2021 at 02:36:55PM -0400, Sean Paul wrote:
> > > > > 
> > > > > Thank you for revising, Fernando! I've pushed the set to drm-misc-next (along
> > > > > with the necessary drm-tip conflict resolutions).
> > > > 
> > > > Ugh. Did anyone actually review the locking changes this does?
> > > > I shot the previous i915 stuff down because the commit messages
> > > > did not address any of it.
> > > 
> > > I reviewed the set on 9/17, I didn't see your feedback on that thread.
> > 
> > It was much earlir than that.
> > https://lists.freedesktop.org/archives/dri-devel/2021-June/313193.html
> > 
> > And I think I might have also shot down a similar thing earlier.
> > 
> > I was actually half considering sending a patch to nuke that
> > misleading TODO item. I don't think anything which changes
> > which locks are taken should be considred a starter level task.
> > And the commit messages here don't seem to address any of it.
> 
> And i915 is now broken :(
> 
> https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10680/fi-bwr-2160/boot.html

I completely overlooked the side effects of not having a global context anymore.
Sorry for all the trouble.

Sean, could you revert the whole patch series? I'll have a deeper look into the
patch set and come up with a v3 where all these issues will be addressed.

Thanks and sorry once again for the extra overhead this might have caused.