linux-kernel - Re: [virtio-dev] [PATCH 2/2] drm/virtio: add iommu support.

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Date:   Wed, 19 Sep 2018 13:38:07 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Jiandi An <jiandi@....com>
Cc:     Dave Airlie <airlied@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        Dave Airlie <airlied@...ux.ie>,
        "open list:VIRTIO CORE, NET..." 
        <virtualization@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "Singh, Brijesh" <brijesh.singh@....com>
Subject: Re: [virtio-dev] [PATCH 2/2] drm/virtio: add iommu support.

> >> Once display manger is kicked off for example (sudo systemctl start lightdm.service) and
> >> resource id 3 gets created from user space down, it still gives a blank black screen.
> > 
> > Hmm.  I'd suspect there is simply a code path missing.  Can you send the
> > patch you have?
> > 
> > cheers,
> >   Gerd
> > 
> 
> I sent the patch.  For now it does dma_sync_sg on the pages in 
> TRANSFER_TO_HOST_2D/3D when use_dma_api is true.
> 
> https://lore.kernel.org/lkml/20180919070931.91168-1-jiandi.an@amd.com/

Hmm, the way it is hooked up it should not miss any resource update.
So not sure why it isn't working.
Pushed the patch nevertheless as it is clearly a step into the right
direction.

cheers,
  Gerd