From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: SATA broken with LPAE
Date: Wed, 26 Jun 2019 14:53:25 +0200
Message-ID: <20190626125325.GA4744@lst.de>
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To: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
Cc: axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org, Vignesh Raghavendra <vigneshr-l0cyMroinI0@public.gmane.org>, martin.petersen-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, linux-ide-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>, jejb-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org, "Nori,
	Sekhar" <nsekhar-l0cyMroinI0@public.gmane.org>, "hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org" <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, rmk+kernel-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, hch-jcswGhMUV9g@public.gmane.org
List-Id: linux-omap@vger.kernel.org

Hi Roger,

it seems the arm dma direct mapping code isn't doing the right thing
here.  On other platforms that have > 4G memory we always use swiotlb
for bounce buffering in case a device that can't DMA to all the memory.

Arm is the odd one out and uses its own dmabounce framework instead,
but it seems like it doesn't get used in this case.  We need to make
sure dmabounce (or swiotlb for that matter) is set up if > 32-bit
addressing is supported.  I'm not really an arm platform expert,
but some of those on the Cc list are and might chime in on how to
do that.