linux-kernel - Re: [PATCH 1/2] arm: msm: Add System MMU support.

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Message-ID: <20100802074812.GM24084@amd.com>
Date:	Mon, 2 Aug 2010 09:48:12 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Arnd Bergmann <arnd@...db.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"stepanm@...eaurora.org" <stepanm@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"dwalker@...eaurora.org" <dwalker@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] arm: msm: Add System MMU support.

On Fri, Jul 30, 2010 at 11:15:24PM -0400, Benjamin Herrenschmidt wrote:
> On Thu, 2010-07-29 at 10:26 +0200, Arnd Bergmann wrote:
> > Exactly, thanks for the clarification. I also didn't realize that
> > there
> > is now an include/linux/iommu.h file that only describes the PCI
> > SR-IOV
> > interfaces, unlike the generic IOMMU support that we have in your
> > include/linux/dma-mapping.h file.
> > 
> > Maybe we should rename linux/iommu.h to something more specific so we
> > can reduce this confusion in the future.
> 
> Hrm, indeed I just noticed that. Pretty gross... it should definitly be
> renamed, is will caused endless confusion with unrelated iommu.h and
> iommu_* interfaces which represent something different.

The first direction to go should be trying to unify all the different
iommu* interfaces into the iommu-api. The generic api will definitly
need to be extended for that, but since it is an in-kernel interface
thats no problem.

-- 
Joerg Roedel - AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632

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