linux-kernel - Re: [PATCH 4/4] iommu: Add domain window handling functions

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Message-ID: <1360020980.14901.17@snotra>
Date:	Mon, 4 Feb 2013 17:36:20 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Joerg Roedel <joro@...tes.org>
CC:	Sethi Varun-B16395 <B16395@...escale.com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Wood Scott-B07421 <B07421@...escale.com>,
	Yoder Stuart-B08248 <B08248@...escale.com>
Subject: Re: [PATCH 4/4] iommu: Add domain window handling functions

On 02/04/2013 07:02:14 AM, Joerg Roedel wrote:
> On Thu, Jan 31, 2013 at 09:32:26AM +0000, Sethi Varun-B16395 wrote:
> > We need a mechanism to determine the maximum number of subwindows  
> supported by PAMU. How about representing it in the iommu_domain  
> structure:
> > struct  iommu_domain {
> > 	struct iommu_ops *ops;
> > 	void *priv;
> > 	iommu_fault_handler_t handler;
> > 	void *handler_token;
> > 	struct iommu_domain_geometry geometry;
> > 	u32 max_sub_windows; -----> maximum number of sub windows  
> supported by the hardware.
> > }
> 
> I`ll leave that flag to the private-data of the IOMMU domain. Instead  
> I
> added a DOMAIN_ATTR_WINDOWS attribute to get/set the number of
> subwindows. I'll post the updated patch-set soon.

If it's private data, how does the caller know what sort of geometry it  
can request?

-Scott
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