linux-kernel - Re: [PATCH 5/6] drm/i915/gt: Serialize GRDOM access between multiple engine resets

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Date:   Wed, 29 Jun 2022 17:30:07 +0200
From:   Mauro Carvalho Chehab <mauro.chehab@...ux.intel.com>
To:     Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc:     Andi Shyti <andi.shyti@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chris Wilson <chris.p.wilson@...el.com>,
        Fei Yang <fei.yang@...el.com>,
        Thomas Hellstrom <thomas.hellstrom@...el.com>,
        Bruce Chang <yu.bruce.chang@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        John Harrison <John.C.Harrison@...el.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Matthew Brost <matthew.brost@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>,
        Umesh Nerlige Ramappa <umesh.nerlige.ramappa@...el.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Mika Kuoppala <mika.kuoppala@...ux.intel.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        stable@...r.kernel.org,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>
Subject: Re: [PATCH 5/6] drm/i915/gt: Serialize GRDOM access between
 multiple engine resets

On Tue, 28 Jun 2022 16:49:23 +0100
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com> wrote:

>.. which for me means a different patch 1, followed by patch 6 (moved 
> to be patch 2) would be ideal stable material.
> 
> Then we have the current patch 2 which is open/unknown (to me at least).
> 
> And the rest seem like optimisations which shouldn't be tagged as fixes.
> 
> Apart from patch 5 which should be cc: stable, but no fixes as agreed.
> 
> Could you please double check if what I am suggesting here is feasible 
> to implement and if it is just send those minimal patches out alone?

Tested and porting just those 3 patches are enough to fix the Broadwell
bug.

So, I submitted a v2 of this series with just those. They all need to
be backported to stable.

I still think that other TLB patches are needed/desired upstream, but
I'll submit them on a separate series. Let's fix the regression first ;-)

Regards,
Mauro