Re: [15/15] dma-mapping: bypass indirect calls for dma-direct
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- To: Robin Murphy <robin.murphy@xxxxxxx>
- Subject: Re: [15/15] dma-mapping: bypass indirect calls for dma-direct
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Wed, 19 Dec 2018 07:42:06 +0100
- Cc: Guillaume Tucker <guillaume.tucker@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Jesper Dangaard Brouer <brouer@xxxxxxxxxx>, Tariq Toukan <tariqt@xxxxxxxxxxxx>, Ilias Apalodimas <ilias.apalodimas@xxxxxxxxxx>, Toke Høiland-Jørgensen <toke@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Keith Busch <keith.busch@xxxxxxxxx>, Jonathan Derrick <jonathan.derrick@xxxxxxxxx>, linux-pci@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>
- In-reply-to: <92096de9-7183-dbe8-2169-0143190591fa@arm.com>
- References: <20181207190720.18517-16-hch@lst.de> <2e779fa7-dc9f-7ed8-252a-5d20c5deca9c@collabora.com> <92096de9-7183-dbe8-2169-0143190591fa@arm.com>
- User-agent: Mutt/1.5.17 (2007-11-01)
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@xxxxxx/
FYI, I'm still waiting for a review on that..
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