linux-kernel - Re: [PATCH v3] drm/virtio: add new virtio gpu capset definitions

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Message-ID: <ZSYnQbHUecuUlwvr@amd.com>
Date:   Wed, 11 Oct 2023 12:40:33 +0800
From:   Huang Rui <ray.huang@....com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Akihiko Odaki <akihiko.odaki@...nix.com>,
        Marc-André Lureau <marcandre.lureau@...il.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Ragiadakou, Xenia" <Xenia.Ragiadakou@....com>,
        "Stabellini, Stefano" <stefano.stabellini@....com>,
        "Huang, Honglei1" <Honglei1.Huang@....com>,
        "Zhang, Julia" <Julia.Zhang@....com>,
        "Chen, Jiqian" <Jiqian.Chen@....com>
Subject: Re: [PATCH v3] drm/virtio: add new virtio gpu capset definitions

On Tue, Oct 10, 2023 at 11:52:14PM +0800, Dmitry Osipenko wrote:
> On 10/10/23 18:40, Dmitry Osipenko wrote:
> > On 10/10/23 16:57, Huang Rui wrote:
> >> These definitions are used fro qemu, and qemu imports this marco in the
> >> headers to enable gfxstream, venus, cross domain, and drm (native
> >> context) for virtio gpu. So it should add them even kernel doesn't use
> >> this.
> >>
> >> Signed-off-by: Huang Rui <ray.huang@....com>
> >> Reviewed-by: Akihiko Odaki <akihiko.odaki@...nix.com>
> >> ---
> >>
> >> Changes V1 -> V2:
> >> - Add all capsets including gfxstream and venus in kernel header (Dmitry Osipenko)
> >>
> >> Changes V2 -> V3:
> >> - Add missed capsets including cross domain and drm (native context)
> >>   (Dmitry Osipenko)
> >>
> >> v1: https://lore.kernel.org/lkml/20230915105918.3763061-1-ray.huang@amd.com/
> >> v2: https://lore.kernel.org/lkml/20231010032553.1138036-1-ray.huang@amd.com/
> >>
> >>  include/uapi/linux/virtio_gpu.h | 4 ++++
> >>  1 file changed, 4 insertions(+)
> >>
> >> diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h
> >> index f556fde07b76..240911c8da31 100644
> >> --- a/include/uapi/linux/virtio_gpu.h
> >> +++ b/include/uapi/linux/virtio_gpu.h
> >> @@ -309,6 +309,10 @@ struct virtio_gpu_cmd_submit {
> >>  
> >>  #define VIRTIO_GPU_CAPSET_VIRGL 1
> >>  #define VIRTIO_GPU_CAPSET_VIRGL2 2
> >> +#define VIRTIO_GPU_CAPSET_GFXSTREAM 3
> > 
> > The GFXSTREAM capset isn't correct, it should be GFXSTREAM_VULKAN in
> > accordance to [1] and [2]. There are more capsets for GFXSTREAM.
> > 
> > [1]
> > https://github.com/google/crosvm/blob/main/rutabaga_gfx/src/rutabaga_utils.rs#L172
> > 
> > [2]
> > https://patchwork.kernel.org/project/qemu-devel/patch/20231006010835.444-7-gurchetansingh@chromium.org/
> 
> Though, maybe those are "rutabaga" capsets that not related to
> virtio-gpu because crosvm has another defs for virtio-gpu capsets [3].
> The DRM capset is oddly missing in [3] and code uses "rutabaga" capset
> for DRM and virtio-gpu.
> 
> [3]
> https://github.com/google/crosvm/blob/main/devices/src/virtio/gpu/protocol.rs#L416

Yes, [3] is the file that I referred to add these capsets definitions. And
it's defined as gfxstream not gfxstream_vulkan.

> 
> Gurchetan, could you please clarify which capsets definitions are
> related to virtio-gpu and gfxstream. The
> GFXSTREAM_VULKAN/GLES/MAGMA/COMPOSER or just the single GFXSTREAM?
> 

Gurchetan, may we have your insight?

Thanks,
Ray

> -- 
> Best regards,
> Dmitry
>