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Message-ID: <YNwYREuSWElXwiAC@infradead.org>
Date: Wed, 30 Jun 2021 08:07:48 +0100
From: Christoph Hellwig <hch@...radead.org>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Jason Wang <jasowang@...hat.com>,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
"Tian, Kevin" <kevin.tian@...el.com>,
"Jiang, Dave" <dave.jiang@...el.com>,
"Raj, Ashok" <ashok.raj@...el.com>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
Jonathan Corbet <corbet@....net>,
David Woodhouse <dwmw2@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
Alex Williamson <alex.williamson@...hat.com>,
Kirti Wankhede <kwankhede@...dia.com>,
Robin Murphy <robin.murphy@....com>,
David Gibson <david@...son.dropbear.id.au>
Subject: Re: [RFC] /dev/ioasid uAPI proposal
On Mon, Jun 07, 2021 at 11:14:24AM -0300, Jason Gunthorpe wrote:
> "non-coherent DMA" is some general euphemism that evokes images of
> embedded platforms that don't have coherent DMA at all and have low
> cost ways to regain coherence. This is not at all what we are talking
> about here at all.
It literally is the same way of working. And not just low-end embedded
platforms use this, but a lot of older server platforms did as well.
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