linux-kernel - fix DMA ops layering violations in vmwgfx

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Date:   Sat,  5 Jan 2019 09:01:04 +0100
From:   Christoph Hellwig <hch@....de>
To:     thellstrom@...are.com
Cc:     linux-graphics-maintainer@...are.com,
        dri-devel@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: fix DMA ops layering violations in vmwgfx

Hi Thomas,

vmwgfx has been doing some odd checks based on DMA ops which rely
on deep DMA mapping layer internals, and I think the changes in
Linux 4.21 finally broke most of these implicit assumptions.

The real fix is in patch 3, but I think the others are important
to make it clear what is actually going on.