linux-kernel - RE: [PATCH 2/3 v2] iommu/fsl: Add iommu domain attributes required by fsl PAMU driver.

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Date:	Thu, 4 Oct 2012 16:22:18 +0000
From:	Sethi Varun-B16395 <B16395@...escale.com>
To:	Kumar Gala <galak@...nel.crashing.org>
CC:	"joerg.roedel@....com" <joerg.roedel@....com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/3 v2] iommu/fsl: Add iommu domain attributes required
 by fsl PAMU driver.



> -----Original Message-----
> From: Kumar Gala [mailto:galak@...nel.crashing.org]
> Sent: Thursday, October 04, 2012 6:47 PM
> To: Sethi Varun-B16395
> Cc: joerg.roedel@....com; iommu@...ts.linux-foundation.org; linuxppc-
> dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org; Sethi Varun-B16395
> Subject: Re: [PATCH 2/3 v2] iommu/fsl: Add iommu domain attributes
> required by fsl PAMU driver.
> 
> 
> On Oct 4, 2012, at 6:56 AM, <b16395@...escale.com> <b16395@...escale.com>
> wrote:
> 
> > From: Varun Sethi <Varun.Sethi@...escale.com>
> >
> > Added the following domain attributes required by FSL PAMU driver:
> > 1. Subwindows field added to the iommu domain geometry attribute.
> > 2. Added new iommu stash attribute, which allows setting of the
> >   LIODN specific stash id parameter through IOMMU API.
> > 3. Added an attribute for enabling/disabling DMA to a particular
> >   memory window.
> >
> > Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
> > ---
> > include/linux/iommu.h |   35 +++++++++++++++++++++++++++++++++++
> > 1 files changed, 35 insertions(+), 0 deletions(-)
> >
> > diff --git a/include/linux/iommu.h b/include/linux/iommu.h index
> > f3b99e1..62e22f0 100644
> > --- a/include/linux/iommu.h
> > +++ b/include/linux/iommu.h
> > @@ -44,6 +44,33 @@ struct iommu_domain_geometry {
> > 	dma_addr_t aperture_start; /* First address that can be mapped
> */
> > 	dma_addr_t aperture_end;   /* Last address that can be mapped
> */
> > 	bool force_aperture;       /* DMA only allowed in mappable range?
> */
> > +
> > +	/* The subwindows field indicates number of DMA subwindows
> supported
> > +	 * by the geometry. Following is the interpretation of
> > +	 * values for this field:
> > +	 * 0 : This implies that the supported geometry size is 1 MB
> > +         * with each subwindow size being 4KB. Thus number of
> subwindows
> > +	 * being = 1MB/4KB = 256.
> > +	 * 1 : Only one DMA window i.e. no subwindows.
> > +	 * value other than 0 or 1 would indicate actual number of
> subwindows.
> > +	 */
> > +	u32 subwindows;
> > +};
> > +
> > +/* cache stash targets */
> > +#define L1_CACHE 1
> > +#define L2_CACHE 2
> > +#define L3_CACHE 3
> 
> These names are way to generic for being exposed to user space
Will fix naming to IOMMU_ATTR_CACHE_L1 etc.

-Varun


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