linux-kernel - Re: [Xen-devel] [PATCH 2/8] xen: Make clear that swiotlb and biomerge are dealing with DMA address

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Message-ID: <alpine.DEB.2.02.1507311154120.11337@kaball.uk.xensource.com>
Date:	Fri, 31 Jul 2015 11:54:27 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	Julien Grall <julien.grall@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <x86@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	<ian.campbell@...rix.com>, <stefano.stabellini@...citrix.com>,
	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH 2/8] xen: Make clear that swiotlb and biomerge
 are dealing with DMA address

On Tue, 28 Jul 2015, David Vrabel wrote:
> On 28/07/15 16:02, Julien Grall wrote:
> > 
> > +/* Pseudo-physical <-> DMA conversion */
> > +static inline unsigned long pfn_to_dfn(unsigned long pfn)
> 
> Use BFN for bus frame number.  This is the terminology that is used in
> the (proposed) pv-iommu hypercall.

Yes, certainly better than DFN.
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