linux-kernel - Re: [PATCH v7 7/9] drm/virtio: Improve DMA API usage for shmem BOs

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Date:   Wed, 6 Jul 2022 10:22:52 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     kernel@...labora.com, David Airlie <airlied@...ux.ie>,
        Thomas Hellström <thomas_os@...pmail.org>,
        Emil Velikov <emil.l.velikov@...il.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Dmitry Osipenko <digetx@...il.com>,
        virtualization@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v7 7/9] drm/virtio: Improve DMA API usage for shmem BOs

On 7/6/22 10:13, Gerd Hoffmann wrote:
>   Hi,
> 
>> Gerd, thank you very much! It's was indeed unclear to me how to test the
>> MMIO GPU, but yours variant with microvm works! I was looking for trying
>> aarch64 in the past, but it also was unclear how to do it since there is
>> no DT support for the VirtIO-GPU, AFAICS.
> 
> aarch64 uses acpi by default (can be disabled via 'qemu -no-acpi').
> Not fully sure about arm(v7).
> 
> Even with DT it should work because DT only describes the virtio-mmio
> 'slots', not the actual virtio devices.
> 
>> There is no virgl support because it's a virtio-gpu-device and not
>> virtio-gpu-device-gl that is PCI-only in Qemu. Hence everything seems good.
> 
> It's named 'virtio-gpu-gl-device'

Ah, thanks again! Just quickly tested virtio-gpu-gl-device and
everything works too for MMIO GPU on microvm, including virgl and Xorg
(glamor).

[drm] features: +virgl +edid -resource_blob -host_visible
[drm] features: -context_init
[drm] number of scanouts: 1
[drm] number of cap sets: 2
[drm] cap set 0: id 1, max-version 1, max-size 308
[drm] cap set 1: id 2, max-version 2, max-size 696
[drm] Initialized virtio_gpu 0.1.0 0 for LNRO0005:01 on minor 0
virtio-mmio LNRO0005:01: [drm] drm_plane_enable_fb_damage_clips() not called

-- 
Best regards,
Dmitry