linux-kernel - Re: [PATCH v2] drm/i915/gt: Hold a wakeref for the active VM

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Date:   Tue, 4 Apr 2023 18:29:26 +0200
From:   Andi Shyti <andi.shyti@...ux.intel.com>
To:     Andrzej Hajda <andrzej.hajda@...el.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Chris Wilson <chris.p.wilson@...ux.intel.com>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [PATCH v2] drm/i915/gt: Hold a wakeref for the active VM

Hi,

On Fri, Mar 31, 2023 at 04:16:36PM +0200, Andrzej Hajda wrote:
> From: Chris Wilson <chris@...is-wilson.co.uk>
> 
> There may be a disconnect between the GT used by the engine and the GT
> used for the VM, requiring us to hold a wakeref on both while the GPU is
> active with this request.
> 
> v2: added explanation to __queue_and_release_pm
> 
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> [ahajda: removed not-yet-upstremed wakeref tracking bits]
> Signed-off-by: Andrzej Hajda <andrzej.hajda@...el.com>

Thank you Tvrtko and Chris for answering my questions,

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

Andi