Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()

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To: Matan Barak <matanb@xxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Date: Sun, 15 Oct 2017 08:21:25 -0700
Cc: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, "linux-nvdimm@xxxxxxxxxxxx" <linux-nvdimm@xxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Ashok Raj <ashok.raj@xxxxxxxxx>, "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>, linux-rdma <linux-rdma@xxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxxxxxx, Linux MM <linux-mm@xxxxxxxxx>, Jeff Moyer <jmoyer@xxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Liran Liss <liranl@xxxxxxxxxxxx>
In-reply-to: <CAAKD3BBR2CmQvg-3bqPog0VFrEm=QU-b-xBDH-_Q+sXV9NkFUA@mail.gmail.com>

On Sun, Oct 15, 2017 at 8:14 AM, Matan Barak <matanb@xxxxxxxxxxxxxxxxxx> wrote:
[..]
> IMHO, using iommu for that and causing DMA errors just because the
> lease broke isn't the right thing to do.

Yes, see the current proposal over in this thread:

https://lists.01.org/pipermail/linux-nvdimm/2017-October/012885.html

References:
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Dan Williams
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Jason Gunthorpe
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Dan Williams
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Jason Gunthorpe
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Dan Williams
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Jason Gunthorpe
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Dan Williams
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Jason Gunthorpe
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Dan Williams
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Christoph Hellwig
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Jason Gunthorpe
- Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
  - From: Matan Barak

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