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Re: [RFC PATCH v3 2/6] swiotlb: Add restricted DMA pool
- To: Claire Chang <tientzu@xxxxxxxxxxxx>
- From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
- Date: Thu, 7 Jan 2021 12:57:40 -0500
- Cc: Rob Herring <robh+dt@xxxxxxxxxx>, mpe@xxxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, paulus@xxxxxxxxx, "list@xxxxxxx:IOMMU DRIVERS <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>," <joro@xxxxxxxxxx>, will@xxxxxxxxxx, Frank Rowand <frowand.list@xxxxxxxxx>, boris.ostrovsky@xxxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, grant.likely@xxxxxxx, xypron.glpk@xxxxxx, Thierry Reding <treding@xxxxxxxxxx>, mingo@xxxxxxxxxx, bauerman@xxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, Saravana Kannan <saravanak@xxxxxxxxxx>, rafael.j.wysocki@xxxxxxxxx, heikki.krogerus@xxxxxxxxxxxxxxx, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, rdunlap@xxxxxxxxxxxxx, dan.j.williams@xxxxxxxxx, Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>, linux-devicetree <devicetree@xxxxxxxxxxxxxxx>, lkml <linux-kernel@xxxxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, "list@xxxxxxx:IOMMU DRIVERS <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>," <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Tomasz Figa <tfiga@xxxxxxxxxxxx>, Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
- Delivery-date: Thu, 07 Jan 2021 17:58:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Jan 08, 2021 at 01:39:18AM +0800, Claire Chang wrote:
> Hi Greg and Konrad,
>
> This change is intended to be non-arch specific. Any arch that lacks DMA
> access
> control and has devices not behind an IOMMU can make use of it. Could you
> share
> why you think this should be arch specific?
The idea behind non-arch specific code is it to be generic. The devicetree
is specific to PowerPC, Sparc, and ARM, and not to x86 - hence it should
be in arch specific code.
>
> Thanks!
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