linux-kernel - Re: [PATCH 6/6] iommu/arm-smmu: Make use of phandle iterators in device-tree parsing

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Date:	Tue, 29 Mar 2016 18:20:17 +0100
From:	Will Deacon <will.deacon@....com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Robin Murphy <robin.murphy@....com>,
	Rob Herring <robh+dt@...nel.org>, grant.likely@...aro.org,
	devicetree@...r.kernel.org, jroedel@...e.de,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 6/6] iommu/arm-smmu: Make use of phandle iterators in
 device-tree parsing

On Wed, Mar 23, 2016 at 12:51:28PM +0100, Joerg Roedel wrote:
> On Tue, Mar 22, 2016 at 06:53:48PM +0000, Robin Murphy wrote:
> > In a stream-matching implementation, a device may quite legitimately
> > own anything up to _all_ of the stream IDs (32768, or 65536 if we
> > ever implement support for the SMMUv2 EXID extension), so this is
> > only a genuine limit for stream indexing (and if anyone ever
> > actually made one of those, I don't think they're running mainline
> > on it).
> 
> Do you mean we might see a lot more than the currently 128 supported
> stream-ids for an smmu?

We might, but this patch is still an improvement for now.

Will