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

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Date:   Tue, 19 Jul 2022 14:30:11 +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 7/19/22 13:31, Gerd Hoffmann wrote:
> On Wed, Jul 06, 2022 at 10:22:52AM +0300, Dmitry Osipenko wrote:
>> 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
> 
> Cool.  Havn't found the time to try s390x, so I'm taking that as good
> enough test that we don't have any unnoticed dependencies on pci.
> 
> Queued up.  I'll go over a few more pending patches, and assuming no
> issues show up in testing this should land in drm-misc-next in a few
> hours.

Great, thank you.

-- 
Best regards,
Dmitry