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

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Date:   Fri, 1 Oct 2021 16:48:15 -0400
From:   Sean Paul <sean@...rly.run>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     Sean Paul <sean@...rly.run>, Fernando Ramos <greenfoo@....eu>,
        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: [PATCH v2 00/17] drm: cleanup: Use DRM_MODESET_LOCK_ALL_*
 helpers where possible

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:
> > On Fri, Sep 24, 2021 at 08:43:07AM +0200, Fernando Ramos wrote:
> > > Hi all,
> > > 
> > > One of the things in the DRM TODO list ("Documentation/gpu/todo.rst") was to
> > > "use DRM_MODESET_LOCAL_ALL_* helpers instead of boilerplate". That's what this
> > > patch series is about.
> > > 
> > > You will find two types of changes here:
> > > 
> > >   - Replacing "drm_modeset_lock_all_ctx()" (and surrounding boilerplate) with
> > >     "DRM_MODESET_LOCK_ALL_BEGIN()/END()" in the remaining places (as it has
> > >     already been done in previous commits such as b7ea04d2)
> > > 
> > >   - Replacing "drm_modeset_lock_all()" with "DRM_MODESET_LOCK_ALL_BEGIN()/END()"
> > >     in the remaining places (as it has already been done in previous commits
> > >     such as 57037094)
> > >     
> > > Most of the changes are straight forward, except for a few cases in the "amd"
> > > and "i915" drivers where some extra dancing was needed to overcome the
> > > limitation that the DRM_MODESET_LOCK_ALL_BEGIN()/END() macros can only be used
> > > once inside the same function (the reason being that the macro expansion
> > > includes *labels*, and you can not have two labels named the same inside one
> > > function)
> > > 
> > > Notice that, even after this patch series, some places remain where
> > > "drm_modeset_lock_all()" and "drm_modeset_lock_all_ctx()" are still present,
> > > all inside drm core (which makes sense), except for two (in "amd" and "i915")
> > > which cannot be replaced due to the way they are being used.
> > > 
> > > Changes in v2:
> > > 
> > >   - Fix commit message typo
> > >   - Use the value returned by DRM_MODESET_LOCK_ALL_END when possible
> > >   - Split drm/i915 patch into two simpler ones
> > >   - Remove drm_modeset_(un)lock_all()
> > >   - Fix build problems in non-x86 platforms
> > > 
> > > Fernando Ramos (17):
> > >   drm: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/i915: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/msm: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN() drm/vmwgfx: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/tegra: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/shmobile: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/radeon: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/omapdrm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/nouveau: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/msm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/i915: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/i915: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN() part 2
> > >   drm/gma500: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm/amd: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
> > >   drm: cleanup: remove drm_modeset_(un)lock_all()
> > >   doc: drm: remove TODO entry regarding DRM_MODSET_LOCK_ALL cleanup
> > > 
> > 
> > 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.

Sean

> 
> -- 
> Ville Syrjälä
> Intel

-- 
Sean Paul, Software Engineer, Google / Chromium OS