linux-kernel - RE: your mail

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Message-ID: <42a1041ac2df4a73a94dc4516969e35d@BL2PR03MB468.namprd03.prod.outlook.com>
Date:	Tue, 25 Feb 2014 11:28:49 +0000
From:	Varun Sethi <Varun.Sethi@...escale.com>
To:	Will Deacon <will.deacon@....com>,
	srikanth TS <srikantht.shivanand@...il.com>
CC:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"sungjinn.chung@...sung.com" <sungjinn.chung@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ts.srikanth@...sung.com" <ts.srikanth@...sung.com>
Subject: RE: your mail



> -----Original Message-----
> From: iommu-bounces@...ts.linux-foundation.org [mailto:iommu-
> bounces@...ts.linux-foundation.org] On Behalf Of Will Deacon
> Sent: Monday, February 24, 2014 10:59 PM
> To: srikanth TS
> Cc: iommu@...ts.linux-foundation.org; sungjinn.chung@...sung.com; linux-
> kernel@...r.kernel.org; ts.srikanth@...sung.com
> Subject: Re: your mail
> 
> On Mon, Feb 24, 2014 at 03:12:21PM +0000, srikanth TS wrote:
> > Hi Will Deacon,
> 
> Hello,
> 
> > Currently SMMU driver expecting all stream ID used by respective
> > master should be defined in the DT.
> >
> > We want to know how to handle in the case of virtual functions
> > dynamically created and destroyed.
> >
> > Is PCI driver responsible for creating stream ID respective BDand
> > requesting SMMU to add to the mapping table[stream Id to context
> > mapping table]?
> >
> > Or is there any right way of doing it?
> 
> Correct, the driver currently doesn't support dynamic mappings (mainly
> because I didn't want to try and invent something that I couldn't test).
> 
> There are a couple of ways to solve this:
> 
>   (1) Add a way for a PCI RC to dynamically allocate StreamIDs on an SMMU
>       within a fixed range. That would probably need some code in the bus
>       layer, so that a bus notifier can kick and call back to the
> relevant
>       SMMU.
This could be done in add device notifier. I am working on similar(not PCI) hot plug device infrastructure for arm smmu driver. I will post an RFC patch by next week.

-Varun

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