linux-kernel - Re: [PATCH 4/5] iommu: Add domain window handling functions

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Message-ID: <20130205132044.GB2532@8bytes.org>
Date:	Tue, 5 Feb 2013 14:20:45 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Stuart Yoder <b08248@...il.com>
Cc:	Sethi Varun-B16395 <B16395@...escale.com>,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] iommu: Add domain window handling functions

On Mon, Feb 04, 2013 at 05:31:51PM -0600, Stuart Yoder wrote:
> On Mon, Feb 4, 2013 at 12:56 PM, Joerg Roedel <joro@...tes.org> wrote:
> > On Mon, Feb 04, 2013 at 12:10:51PM -0600, Stuart Yoder wrote:
> >> On Mon, Feb 4, 2013 at 7:18 AM, Joerg Roedel <joro@...tes.org> wrote:
> >> > +static inline int iommu_domain_window_enable(struct iommu_domain *domain,
> >> > +                                            u32 wnd_nr, phys_addr_t paddr,
> >> > +                                            size_t size)
> >> > +{
> >> > +       return -ENODEV;
> >> > +}
> >> > +
> >> > +static inline void iommu_domain_window_disable(struct iommu_domain *domain,
> >> > +                                              u32 wnd_nr)
> >> > +{
> >> > +}
> >> > +
> >> >  static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
> >> >                                              unsigned long iova)
> >> >  {
> >>
> >> This API looks workable.   The one change we need is that the size argument in
> >> the enable API needs to be 64 bits.   Our window sizes can exceed 4GB.
> >
> > Okay. So if your architecture supports sizes over 2^32 then size_t
> > probably is already 64bits, right?
> 
> No, on a 32-bit platform size_t would generally be 32-bits.  But the PAMU
> is independent of that.   I think we should just make it a u64.

Okay, I will change that. Will push the updated branch once Sethi agrees
on the interface changes.


	Joerg


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