linux-kernel - Re: [PATCH v2 05/21] drm/i915/gt: Skip TLB invalidations once wedged

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YtqRSXXiON8Oed96@alfio.lan>
Date:   Fri, 22 Jul 2022 14:00:09 +0200
From:   Andi Shyti <andi.shyti@...ux.intel.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Chris Wilson <chris.p.wilson@...el.com>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Fei Yang <fei.yang@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>
Subject: Re: [PATCH v2 05/21] drm/i915/gt: Skip TLB invalidations once wedged

Hi Mauro,

On Thu, Jul 14, 2022 at 01:06:10PM +0100, Mauro Carvalho Chehab wrote:
> From: Chris Wilson <chris.p.wilson@...el.com>
> 
> Skip all further TLB invalidations once the device is wedged and
> had been reset, as, on such cases, it can no longer process instructions
> on the GPU and the user no longer has access to the TLB's in each engine.
> 
> That helps to reduce the performance regression introduced by TLB
> invalidate logic.
> 
> Cc: stable@...r.kernel.org
> Fixes: 7938d61591d3 ("drm/i915: Flush TLBs before releasing backing store")
> Signed-off-by: Chris Wilson <chris.p.wilson@...el.com>
> Cc: Fei Yang <fei.yang@...el.com>
> Cc: Andi Shyti <andi.shyti@...ux.intel.com>
> Acked-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>

I haven't read any concern from Tvrtko here, in any case:

Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com>

thanks,
Andi