linux-kernel - Re: [PATCH v12 10/11] drm/virtio: Support memory shrinking

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Message-ID: <a49fb815-1f02-e8c1-fd8e-128f3b43e490@collabora.com>
Date:   Tue, 7 Mar 2023 21:40:30 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Qiang Yu <yuq825@...il.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Herring <robh@...nel.org>
Cc:     intel-gfx@...ts.freedesktop.org, kernel@...labora.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v12 10/11] drm/virtio: Support memory shrinking

On 3/7/23 21:25, Dmitry Osipenko wrote:
>> Not really a problem with this patchset, but having such branches looks
>> like a bug in the driver's GEM design. Whatever your GEM object needs or
>> does, it should be hidden in the implementation. Why is virtio doing this?
> There is another "VRAM" VirtIO-GPU BO type that doesn't implement the
> pin/unpin callbacks. Perhaps another option was to add the callbacks.

Although, the pin/unpin are optional. So yes, there was no need for the
extra branch, good catch.

-- 
Best regards,
Dmitry