linux-kernel - Re: [PATCH v2 2/2] drm/msm/gem: Add metadata

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Message-ID: <CAA8EJpp-pwho=GRX1WuA3TbNTdOjM57SR52-=G=LU3rSeifohA@mail.gmail.com>
Date:   Sun, 29 Oct 2023 18:39:30 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        Daniel Stone <daniels@...labora.com>,
        Rob Clark <robdclark@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] drm/msm/gem: Add metadata

On Sun, 29 Oct 2023 at 17:07, Rob Clark <robdclark@...il.com> wrote:
>
> From: Rob Clark <robdclark@...omium.org>
>
> The EXT_external_objects extension is a bit awkward as it doesn't pass
> explicit modifiers, leaving the importer to guess with incomplete
> information.  In the case of vk (turnip) exporting and gl (freedreno)
> importing, the "OPTIMAL_TILING_EXT" layout depends on VkImageCreateInfo
> flags (among other things), which the importer does not know.  Which
> unfortunately leaves us with the need for a metadata back-channel.
>
> The contents of the metadata are defined by userspace.  The
> EXT_external_objects extension is only required to work between
> compatible versions of gl and vk drivers, as defined by device and
> driver UUIDs.
>
> v2: add missing metadata kfree
>
> Signed-off-by: Rob Clark <robdclark@...omium.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>  drivers/gpu/drm/msm/msm_drv.c | 57 ++++++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/msm/msm_gem.c |  1 +
>  drivers/gpu/drm/msm/msm_gem.h |  4 +++
>  include/uapi/drm/msm_drm.h    |  2 ++
>  4 files changed, 63 insertions(+), 1 deletion(-)

-- 
With best wishes
Dmitry