From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [15/15] dma-mapping: bypass indirect calls for dma-direct
Date: Wed, 19 Dec 2018 07:42:06 +0100
Message-ID: <20181219064206.GA27018@lst.de>
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To: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
Cc: Fenghua Yu <fenghua.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Toke =?iso-8859-1?Q?H=F8iland-J=F8rgensen?= <toke-LJ9M9ZcSy1A@public.gmane.org>, linux-ia64-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, ezequiel Garcia <ezequiel-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>, Guillaume Tucker <guillaume.tucker-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>, Ilias Apalodimas <ilias.apalodimas-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Keith Busch <keith.busch-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Tony Luck <tony.luck-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, Jesper Dangaard Brouer <brouer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>, Jonathan Derrick <jonathan.derrick-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Tariq Toukan <tariqt-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
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On Tue, Dec 18, 2018 at 08:42:46PM +0000, Robin Murphy wrote:
>> [   16.046084] rk_iommu ff8f3f00.iommu: DMA map error for DT
>
> Yup, with this patch as-is, anything which isn't behind an IOMMU will be 
> erroneously banned from DMA entirely - see here:
>
> https://lore.kernel.org/lkml/20181214142435.GA18448-jcswGhMUV9g@public.gmane.org/

FYI, I'm still waiting for a review on that..