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

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Message-ID: <20180919044600.utvnu5l6fvvi2qi4@sirius.home.kraxel.org>
Date:   Wed, 19 Sep 2018 06:46:00 +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.

  Hi,

> buffer.  I tried to put a dma_sync_sg_for_device() on virtio_gpu_object obj->pages-sgl
> before VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D is sent.  This fixes the kernel console path.

That should be the right place.

> 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