linux-kernel - Re: [PATCH 3/3] drm/vc4: Don't liberate the binner BO at runtime suspend

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Message-ID: <87o96alk7k.fsf@anholt.net>
Date:   Sat, 16 Mar 2019 11:58:55 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Eben Upton <eben@...pberrypi.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH 3/3] drm/vc4: Don't liberate the binner BO at runtime suspend

Paul Kocialkowski <paul.kocialkowski@...tlin.com> writes:

> The binner BO is a pre-requisite to GPU operations, so we must ensure
> that it is always allocated when the GPU is in use.
>
> Because the buffer is allocated from the same pool as other GPU buffers,
> we might run into a situation where we are out of memory at runtime
> resume. This causes the binner BO allocation to fail and results in all
> subsequent operations to fail, resulting in a major hang in userspace.
>
> Now that we allocate the buffer at firstopen and liberate it at
> lastclose, we can just keep it alive during runtime suspend.

I think this needs to be squashed into the previous patch, as otherwise
coming from suspended, a firstopen -> resume -> render will leak a copy
of the bin BO.

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